” NOTICE ~
`
`JPO and INPIT are not responsible for any damages caused by the use of this translation.
`
`7. This dacument has been transiated by computer. So the fransiation may not reflect the anginal precisely.
`
`2. *"* shows a@ word which cannat be translated.
`
`3. in the drawings, any words are not innstated.
`
`Publication Number
`
`JP2OTSTSS1S1A
`
`Bibliography
`(19) [Publication country] JP
`
`(t2) [Kind of official gazette] A
`
`{tt} [Publication nurnber] 2078739194
`
`{43} [Date of publication of application] 20180906
`
`(54)
`
`[Tite of
`
`the invention] POWER STORAGE ELEMENT AND METHOD OF
`
`MANUFACTURING POWER STORAGE ELEMENT
`
`{51} {international Patent Classification]
`
`
`
`HOIM=2/30 (2006.01}
`
`HOIM 2/08
`
`(2006.01)
`
`
`
`HOM=2/06 {2006.01}
`
`
`
`HOM=2/04 {2006.01}
`
`HOIM 2/26
`
`HOIG 11/78
`
`HOIG T1476
`
`HOIG 11/84
`
`(2006.61)
`
`(2013.01}
`
`(2013.01)
`
`(2013.01)
`
`
`
`HOIM=2/34 {2006.01}
`
`[FA]
`
`
`
`HOIM=2/30 B
`
`HOM
`
`(08
`
`HOIM 2/06
`
`A
`
`A
`
`
`
`HOM=2/04 A
`
`
`
`HOM=2/26 A
`
`HOIG 141/78
`
`HOIG TV76
`
`HOYG 11/84
`
`

`

`HOM 2/34
`
`B
`
`(27) [Application number] 2077033539
`
`(22) [Filing date] 20170224
`
`(7 1} [Applicant]
`
`iName] LITHIUM ENERGY AND POWER GMBH & CO KG
`
`(72) [inventor]
`
`iFull name] SSHIMASA TAKESHI
`
`ifhemecode {reference}
`
`5EQ78
`
`5HO11
`
`5HO43
`
`fF-ierm (reference) }
`
`5EQ7BAATS
`
`SEQ?BAATS
`
`5E078AB01
`
`5EOQ?T8HAOS
`
`SE078HA23
`
`SE078KAOZ
`
`5E07BKAOS
`
`5EQ78KA0S
`
`5SEOT8KADG
`
`5EQ78LA07
`
`SHOTIAADR
`
`SHOT AAG
`
`SHOTTAAIO
`
`BHOTIAAIT
`
`5HO11CCOG
`
`SHOTIDDO1
`
`5HOtIDDO?T
`
`5HOTIDD14
`
`5HOTIDD22
`
`5HO11EE04
`
`5HG1 1FFO4
`
`SHOTIGGOI
`
`5HOTTHHO2
`
`5HOT 1 E02
`
`

`

`SHOT 112
`
`SHOT 14
`
`5HOTTKKO4
`
`5SHO43AA05
`
`SHOSSAAT3
`
`SHO4S3AAT9
`
`SHO43BA04
`
`SHO43BAT4
`
`5HO43BAT9
`
`SHO43CAG3
`
`SHO43CAG4
`
`SHO43CAI2
`
`SHO43DA26
`
`5SHO43EA0S
`
`5HO43EAS2
`
`SHO4ASEA35
`
`SHO43EA36
`
`SHO43HA02E
`
`SHO43HA05D
`
`5HO43HAGSE
`
`SHO4SHAGS
`
`SHO4SHAGSD
`
`SHO43HA0SE
`
`SHO43HA12
`
`5HO43HAI2D
`
`5HO43HAITE
`
`SHOASHA22
`
`SHO43HA22D
`
`SHO43HA34
`
`SHO43HA31D
`
`5HO43JA01D
`
`SHOASJADIE
`
`SHO4ASIJAO2
`
`SHO435A02D
`
`SHO43UA06E
`
`SHO43GAT1D
`
`

`

`SHO435A12
`
`SHO43GA12D
`
`5HO43KA01D
`
`5HO43KAS2
`
`SHO4SKA220
`
`SHO43KA22E
`
`SHO43KA24
`
`SHO43KA24D
`
`5HO4S3KAS4E
`
`SHO4SSKA35
`
`SHO4SKA35R
`
`SHO43LA2 1
`
`SHO43LA21D
`
`5HO43LA41
`
`Abstract
`
`(57) [Overview]
`
`PROBLEM TO BE SOLVED: To increase the degree of freedom of design of a power
`
`storage element by eliminating constrains on the design due to caulking while ensuring
`
`air-tighiness of the power storage element.
`
`SOLUTION: A power storage element 10 includes: a container 100; a collector (positive
`
`electrode collector 190} an electrode terminal (positive electrode terminal 200} joined to
`
`the collector, and a resin member (insulating member 150) interposed between the case,
`
`and the collector and the electrode terminal. Adhesive layers 117, 118 and 223 are
`
`formed on a joint surface {a lower surface 222, an overlapping region 1416} with the resin
`
`member in al least one of the electrode terminal and the container. A plurality of the
`
`adhesive layers 117, 118 and 223 are disposed at positions airtightly sealing between
`
`the resin member and at least one of the electrode terminal and the container 100, on
`
`ihe same plane at the joint surface.
`
`SELECTED DRAWING: Figure 4
`
`Claim
`
`{Patent Claims]
`
`iClaim 1}
`
`Container,
`
`Charge collector,
`
`

`

`An electrode terminal bonded to the current collector;
`
`A resin memberinterposed betveen the current collector and the electrode terminal and
`
`the container is provided.
`
`An adhesive layeris formed on a bonding surface of at least one of the electrocie terminal
`
`and the container with the resin member.
`
`A plurality of the adhesive layers are arranged on the same plane on the bonding surface
`
`at a pasition where the electrode terminal and at least one of the container and the resin
`
`member are hermetically sealed.
`
`Storage element.
`
`fClaim 2]
`
`The adhesive layer is formed of an adhesive whose adhesion to the metal is higher than
`
`that of the resin member.
`
`A storage element accordingto claim 1.
`
`iClaim 3]
`
`The adhesive is a thermoplastic adhesive.
`
`A storage element according to claim 2.
`
`iClaim 4]
`
`The meting point of the thermoplastic achesive is lower than the melting point of the
`
`resin member.
`
`A storage elernent according to claim 3.
`
`fClaim 5]
`
`The container, the electrode terminal and the resin member are formed intearally.
`
`A storage element according to any one of claims 7 ta 4.
`
`iClaim 6]
`
`A first through hole through which a shaft part of the electrode terminal penetrates is
`
`formed in the container via the resin member.
`
`A* multisite annular achesive layer which continuously surrounds the first through hale
`
`is formed on the joint surface of the container.
`
`A storage element according to any one of claims 1 to 5.
`
`iClaim 7]
`
`A * multiple annular adhesive layer which continuously surrounds the shaft partion is
`
`formed on the bonding surface of the electrode terminal.
`
`A storage element according to claim 6.
`
`iClaim 8]
`
`A 2 through hole through which the resin member penetrates is formed around the first
`
`through hole in the container.
`
`

`

`A * annular adhesive layer which continuously surrounds the 2 through hole is formed
`
`on the joint surface of the container.
`
`A storage element accordingto claim 6 or 7.
`
`fClaim 9]
`
`Container,
`
`Charge collector,
`
`An electrode terminal bonded to the current collector;
`
`A method of manufacturing a storage element includes a current collector and a resin
`
`member interposed between the electrode terminal and the container.
`
`A plurality of adhesive layers are formed at @ position on the sarne plane of a bonding
`
`surface of at least one of the electrode terminal and the container with the resin member,
`
`and a space between the electrode terminal and at least one of the container and the
`
`resin member is made airtight.
`
`The electrode terminal and the container are insert-molded with the resin member,
`
`whereby electricily is applied to the electrode terminal and the container.
`
`The electrode terminal, the container, the adhesive layer and the resin member are
`
`integrated.
`
`A manufacturing method of a storage element.
`
`Description
`
`{Detailed description of the invention]
`
`ffechnical field]
`
`{0004]
`
`The present invention relates to a storage element and a method of manufacturing a
`
`storage element.
`
`iBackground of the Invention]
`
`{0002}
`
`in @ power storage element, there is known a structure in which an electrode terminal is
`
`caulked to a current collector through a container and an insulator so that the electrode
`
`terminal and the current collector are electrically connected (for example, refer to Patent
`
`Dacument 1}.
`
`In this case, the insulator is pressed by the fastening force caused by
`
`caulking, thereby ensuring a constant airtightness.
`
`iPrior art reference]
`
`iPatent document]
`
`[0003]
`
`

`

`[Patent document 1/JP 2074-72190A
`
`Summary of the invention]
`
`fProblem fo be solved by the invention]
`
`f0004]
`
`When the electrode terminal is crimped, since the caulked portion is disposed inside the
`
`container, the inner space of the container is narrowed, and accordingly,it is necessary
`
`to reduce the size of the electrode member.
`
`in this way, when joining by caulking is
`
`employed, restrictions on design are necessary, which has been a cause of hindering
`
`the degree of freeciom of design. Further, even if a joining method other than caulking is
`
`used, there is a possibility that airtighiness cannot be secured.
`
`{0005}
`
`it is therefore an object of the present invention to provide an improved design freedom
`
`of a power storage element by eliminating restrictions on design due to caulking while
`
`securing airiighiness.
`
`[Means for solving the probiern}
`
`fO0C6}
`
`in order to achieve the above object, according to an aspect of the present invention,
`
`there is provided a power storage device comprising : a container ; a current collector ;
`
`an electrode terminal connected to the current collector ; a resin member interpased
`
`between the current collector and the electroce terminal ;: and a container. An adhesive
`
`layer is formed on the bonding surface of at least one of the electrode terminal and the
`
`container, and a plurality of adhesive layers are disposed on the bonding surface on the
`
`bonding surface and at a pasition where the electrode terminal and at least one of the
`
`container and the resin member are hermetically sealed.
`
`[0007]
`
`According to this configuration, a plurality of adhesive layers are disposed at the same
`
`plane on the bonding surface and ai a position where theelectrode terminal and at least
`
`oneof the container and the resin member are hermetically sealed, so that airtightness
`
`can be secured at a plurality of locations. In other words, itis possible to obtain stable
`
`airtighiness even without caulking. Thus, design constraints for caulking can be
`
`eliminated, and design freedorn can be increased. Specifically, since the internal space
`
`of the container can be enlarged, the electrocile body can be enlarged without increasing
`
`the size of the container.
`
`{0008]
`
`in acieiition, since @ plurality of adhesive layers are arranged at the same plane on the
`
`bonding surface and between theefectrade terminal and at least one of the container
`
`

`

`and the resin member, even if the adhesive layer is damaged, airtighiness can be
`
`ensured by the other adhesive layer.
`
`in other words, even if an adhesive layer is not
`
`provided on the entire bonding surface, itis possible fo relfably maintain the airtighiness
`
`between the electrode terminal or the container and the resin member.
`
`{0009}
`
`Further, ihe adhesive layer may be formed of an adhesive having a higher adhesion to
`
`the metal ihan an adhesion to the resin member.
`
`{0070}
`
`According fo this configuration, since the adhesive layer is formed from an adhesive
`
`having a higher adhesion to the metal than the achesian ta the resin member, when the
`
`container and the electrode termina! are made of metal, for example, the adhesive layer
`
`is firmly adhered to the container or the electrode terminal rather than fo the resin
`
`member. Therefore, a higher airtiqhiness can be achieved.
`
`{007 4]
`
`Also, the adhesive may be a thermopfastic achesive.
`
`{0042}
`
`According to this configuration, since the adhesive is a thermoplastic adhesive, the
`
`adhesive can be melted by melting the resin member at the time of manufacturing. Thus,
`
`adhesion between the adhesive layer and the resin member can be further enhanced.
`
`{0073}
`
`Further, the melting point of the thermoplastic adhesive may be lower than the melting
`
`point of the resin member.
`
`f00744]
`
`According to this configuration, since the melting point of the thermoplastic adhesive is
`
`iower than the melting point of the resin member, when the resin member is inseri-
`
`moided with respect fo the container and the electrode terminal, the thermaplastic
`
`adhesive can be reliably melted by the heat of the resin member. Thus, it is possibleto
`
`enhance the intearity of the resin member after curing and the adhesive layer.
`
`[0075]
`
`Further, the container, the electrode terminal, and the resin member may be integrally
`
`formed.
`
`{0076}
`
`According to this configuration, since the resin member, the container, and the electrode
`
`terminal are integrally molded bodies, airtidhiness between the resin member and the
`
`container can be further enhanced.
`
`

`

`fo0t7]
`
`in addition, a first through hole through which the shaft portion of the electrode terminal
`
`penetrates may be formed in the container via a resin member, and a * multiple annular
`
`adhesive layer which continuously surrounds the first through hole may be formed on
`
`the joint surface of the container.
`
`{0078}
`
`According to this configuration, since each of the multiple annular adhesive layers
`
`continuously surrounds the first through hole,
`
`it
`
`is possible to reliably maintain the
`
`airtighiness around the first through hole with the plurality of adhesive layers.
`
`{0079}
`
`in addition, a * multiple annular adhesive layer which continuously surrounds the shaft
`
`portion may be formed on the bondingsurface of the electrode terminal.
`
`[0020]
`
`According fo this configuration, since each of the multiple annular adhesive layers
`
`continuously surrounds the shaft portion, airfightness around the shaft portion can be
`
`reliably maintained by the plurality of adhesive layers.
`
`{0024}
`
`in addition, a 2 through hole through which the resin member penetrates may be formed
`
`around the first through hole in fhe container, and a * annular achesive layer that
`
`continuously surrounds the 2 through hole may be formed on the joint surface of the
`
`container.
`
`{0022}
`
`According to this configuration, since the resin member penetrates through the 2
`
`through-hole around the first through-hole in the container, the rotation of the resin
`
`member around the first through-hole can be prevented. Further, since the annular
`
`acdihesive layer is formed as a * which continuously surrounds the 2 through hole on the
`
`joint surface of the container, it is possibleto reliably maintain theairtightness between
`
`the containers in the vicinity of the 2 through hole and the resin member.
`
`{0023]
`
`in addition, in the method for manufacturing a power storage element according to an
`
`embodiment of the present invention, a container, a current collector, an electrode
`
`terminal bonded to the current collector, a resin member interposed between the current
`
`collector and the electrode terminal, and a container are provided. At least one of the
`
`électrode terminal and the container and the resin memberis provided on the same plane
`
`of the joining surface of the electrocie terminal and the container with the resin member.
`
`

`

`After forming a plurality of adhesive layers af positions to be brought into contact with
`
`each other, the electrode terminals and the container are inseri-moided to integrate the
`
`electrode terrninais, the container, the adhesive layer, and the resin member.
`
`fO024]
`
`According to this configuration, since the resin member, ihe container, and the electrode
`
`terminal are formed integrally, itis passible to enhance the airtighiness between the resin
`
`member and the container or between the resin member and the electrode terminal. In
`
`particular, a plurality of adhesive layers are formed at the same plane on the bonding
`
`surface and al a position where the electrode terminal and ai least one of the container
`
`and the resin member are hermetically sealed, so that airlightness can be secured at a
`
`plurality of locations. In other words,
`
`it is possible fo obtain stable airighiness even
`
`without caulking. Thus, design constraints for caulking can be eliminated, and design
`
`freeciom can beincreased. Specificaily, since the internal space of the container can be
`
`enlarged, the electrode body can be enlarged without increasing the size of the container.
`
`fEffect of the Invention]
`
`{0025}
`
`According to the present invention, even if a joining method ofher than caulking is
`
`employed, airichiness can be secured, and the degree of freedom in designing the
`
`power storage element can beincreased.
`
`[Brief Description of the Drawings]
`
`[0026]
`
`fFig. 1]FiG. 1 is a perspective view showing an external appearance of a power storage
`
`élement according to an embodiment:.
`
`[Fig. 2]F1lG. 1 is an exploded perspective viewof a power storage element accordingto
`
`an embodiment :.
`
`[Fig. 3S]FIG. 1 is a perspective view showing a configuration of an electrode assembly
`
`according to an embodiment :.
`
`{Fig. 4]FIG.
`
`fT
`
`is a cross-sectional view showing a schematic configuration of a fixing
`
`structure of a posifive electrode terminal, an insulating member, and a lid according to
`
`an embodiment :.
`
`fFig. 5IFIG. 1 is a cross-sectional view showing a schematic configuration of a fixing
`
`structure of a pasitive electrode terminal, an insulating member, and alid according to
`
`an embodiment «.
`
`{Fig. 6]F1G. 4 is a pian viewof a positive electrode terminal according to an embodiment
`
`when viewed from below :.
`
`fFig. FJFIG. 4 is a plan view showing a schematic configuration of a fixed portion on a
`
`

`

`positive electrode side of a lid according to an embodiment:.
`
`IFig. BIFIG. 9 is a plan view showing a schematic configuration of a fixed portion on a
`
`positive electrode side of a lid according to Modification 1 :.
`
`[Fig. SIF IG. 9 is a plan viewof a positive electrode terminal according to Modification 2
`
`seen from below >.
`
`fFig. 1Q]F1G. 9 is a cross-sectional view showing a schematic configuration of a fixing
`
`structure of a positive electrode terminal, an insulating member, and a cover according
`
`to Modification 3 :.
`
`[Mode for carrying out the invention]
`
`[0027]
`
`Hereinafter, a storage element according to an embodiment of the present invention will
`
`be described with reference to the accompanying drawings.
`
`in addition, each of the
`
`drawings is a schematic diagram and is not necessarily shown strictly.
`
`[0023]
`
`Further, the embodiments described below Hlustrate one specific example of the present
`
`invention. The shapes, materials,
`
`components, arrangement positions of
`
`the
`
`components and the connection form, the order of the manufacturing processes, and the
`
`ike shown in the following embodiments are merely examples, and do not limit the
`
`present invention. In addition, camponents which are not described in the independent
`
`claims
`
`showing the highest concept among ithe components
`
`in the following
`
`embodiments will be described asarbitrary components.
`
`{0029}
`
`First, referring to FIG. 1 and FIG. 2, an averall description of the power storage elernent
`
`70 will be given.
`
`[0030]
`
`FRG.
`
`1
`
`iS @ perspective view showing an external appearance of the power storage
`
`element 10 accordingto the embodiment. FIG. 2 is an exploded perspective view of the
`
`power storage element 10 according to the embodiment.
`
`{003 4]
`
`Further, although in FXG. 1 and the following figures, for convenience of explanation, the
`
`Z-axis direction is described as the vertical direction, in the actual use mode, the Z-axis
`
`direction and the vertical direction may not coincide with each other.
`
`{0032}
`
`The electricity storage clement 10 is a 2 batlery capable of charging electricity and
`
`dischargingelectricity. Specifically, the storage elements 70 are nonaqueous electrolyte
`
`

`

`secondary batteries, such as a rechargeable lithium-ion battery. The storage element 10
`
`is applied to, for example, an electric vehicle (EV), a hybrid electric vehicle (HEV), a plug-
`
`in hybrid electric vehicle (PHEV}, or the like. Note that the power storage element 10 is
`
`nat limiied to a nonaqueous electrolyte secondary battery, and may be a 2 battery other
`
`than a nonaqueous electrolyte 2 battery, or a capacitor, or a 2 battery. Further, the
`
`storage element 10 may be a primary battery. Further, the shape of the storage element
`
`10 is not imited to a square shape shown in FIG. 1, and may be another shape such as
`
`a cylindrical shape.
`
`{0033]
`
`As shown in FRG. t and FRG. 2, the storage element 10 includes @ container 100, a
`
`positive electrode terminal 200, a negative electrode terminal 300, an electrode body
`
`400, insulating members 150 and 310, and a sice spacer 700. Note that, as will be
`
`described later, the electricity storage element 10 includes a positive electrode current
`
`collector 790 (see FIG. 4, etc.) which electrically connects the positive electrode and the
`
`positive electrode terminal 200 of the electrode body 400, and a negative electrode
`
`current collector (not shown) which electrically connects the negative electrode and the
`
`negative electrode terminal 300 of the electrode body 400,
`
`in addition to the above-
`
`described components. In addition, an electrolytic solution (nonaqueous electralyte} or
`
`the like is enclosed in the container 700 of the storage element 10, and the illustration
`
`thereof is omitted. Note that, as an electrolyte to be sealed in the container 100, there is
`
`no particular limitation as long as if does not impair the performance of the storage
`
`element 10, and various kinds of electrolytes can be selected.
`
`{0034]
`
`The container 100 is a rectangular case and inclucles @ main body 177 and a lid body
`
`470. The material of the body 7747 and the fid 110 is not particularly limited, but is
`
`preferably a weldable metal such as stainless steel, aluminum, or an aluminum alloy.
`
`{0035}
`
`The body 111 is a cylindrical body whichis rectangular in plan view, has an opening 112
`
`at one end, and a bottom 113 at the other end. In assembling, the electrode bady 400,
`
`the side spacer 700, and the like are inserted into the body 111 of the container 100
`
`through the opening 772. A direction in whichthe electrode body 400, the side spacer
`
`700, and the like are inserted into the opening 112 is defined as an insertion direction (2-
`
`axis direction).
`
`In the body i141, the inside of the electrode body 400 and the like is
`
`housed, and then the lid body 1106 is welded, so that the inside of the badly is sealed.
`
`{0036]
`
`The id 240 is a plate member which closes the opening 112 of the main body 111.
`
`

`

`Although not shown in the drawing, a gas discharge valve and a liquid injection port are
`
`formed in the lid 170. The gas discharge valve is opened when the internal pressure of
`
`the container 100 rises, thereby releasing the gas inside the container 100. The injection
`
`port iS an opening for injecting an electrolyte inio the container 100, and is sealed by
`
`fitting the injection plug after the injection.
`
`f0037]
`
`The positive electrocle terminal 200 is an electrode terminal electrically connected to the
`
`tab portion 410 on the positive electrodeside of the electrode body 400 via the positive
`
`electrode current collector 190. The negative electrode terminal 300 is an electrode
`
`terminal electrically connected to the tab portion 420 on the negative electrode side of
`
`the electrode body 400 via a negative electrode current collector. in other words, the
`
`positive electrode terminal 200 and the negative electrode terminal 300 are electrade
`
`terminals of a conductive metal or the like having conductivity for quiding electricity
`
`stored in fhe electrode body 400 to an external space of the electricity storage element
`
`10 and introducing electricity into the internal space of the electricity storage elernent 10
`
`for storing electricity in the electrode body 400.
`
`{0038}
`
`Further, the positive electrode terminal 200 and the negative electrode terminal 300 are
`
`attached to the lid body 110 disposed above fhe electrode body 400 via insulating
`
`members 150 and 310 having an insulating property. A fixing structure of the positive
`
`electrode terminal 200, the negative electrode terminal 300, the insulating members 150
`
`and 370, and the fid body 770 will be described later.
`
`{0039}
`
`in this embodiment, a side surface (both side surfaces in the X-axis direction in this
`
`embodiment) of the electrode body 400 in a direction intersecting the arrangement
`
`direction (Z-axis direction) of the electrode body 400 and the iid 170 and a container 100
`
`are provided.
`
`A side spacer 700 is arranged between the inner peripheral surface. For example, the
`
`side spacer 700 plays a role of regulating the position of the electrode body 400. The
`
`side spacer 700 is formed of an insulating material such as polycarbonate (PC),
`
`palypropylene (PP), polyethyiene (PE}, or polyohenylene sulfide resin (PPS).
`
`{0040}
`
`Next, a configuration of the electroce bocly 400 wil be described with reference fo FIG.
`
`3.
`
`[0044]
`
`

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`FIG. 3 is a perspective view showing a configuration of an electrode assembly 400
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`according to an embodiment. In FIG. 3, the state of winding of the electrode body 400 is
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`partially developed.
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`{0042}
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`The electrode body 400 is a power storage element (power generation element) capable
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`of storing electricity. The electrode body 400 is formed by alternately laminating a
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`positive electrode 450, a negative electrade 460, and separators 470 a and 470 b and
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`winding them. In other words, the electrode body 400 is formed by laminating a positive
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`electrode 450, a separator 470 a, a negative electrode 460, and a separator 470 b in this
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`order, and winding them so as to have an oval cross section.
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`{0043}
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`The positive electrode 450 is an electrode plate in which a positive electrode active
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`substance layer is formed on a surfaceof a positive electrode substrate layer which is a
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`tong belt-shaped metal foil made of aluminum or an aluminum allay. As a positive
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`electrode active substance used for the positive electrode active substance layer, any
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`known material can be used as long as itis a positive electrode active substance capable
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`of occluding and releasing lithium ions. The negative electrode 460 is an electrode plate
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`in which a negative electrode active material layer is formed on a surface of a negative
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`electrode substrate layer which is a long beli-shaped metal foil made of copper or a
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`copper alloy or the like. As the negative electrode active material used for the negative
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`electrode active material layer, any known material can be used as fong as the negative
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`electrode active material can occlucie and release ithium ions.
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`{0044]
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`The separators 470 a and 470 b are microporous sheets made of resin. As a material of
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`the separators 470 a and 470 b used in the storage element 10, a known material can
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`be used as long as i does not impair the performance of the storage element 10.
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`{0045}
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`The positive electrode 450 has a plurality of projecting portions 411 protruding outwardly
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`at one end in the direction of ihe winding axis. Similarly, the negative electrode 460 has
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`a plurality of projecting partions 421 protruding outward at one end in the winding axis
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`direction. The plurality of protrusions 411 and the plurality of protrusions 421 are portions
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`fan uncoated portion} where the active material is not coated and the substrate layer is
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`exposed.
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`{0046]
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`Note that the winding axis is a virtual axis which is a central axis when the positive
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`electrode 450 and the negative electrode 460 are wound, and in this embodiment, is
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`

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`parallel to the Z-axis direction passing through the center of the electrode body 400.
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`[0047]
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`The plurality of protrusions 474 and the plurality of protrusions 421 are disposed at an
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`end of ihe same side in the windingaxis direction (1.
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`€.,
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`an end on the positive side in
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`the Z-axis direction of FIG. 3), and stacked at a predetermined position of the electrode
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`body 400 by stacking the positive electrode 450 and the negative electrode 460.
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`Specifically, the plurality of protrusions 411 are stacked by winding the positive electrode
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`450 by winding, and are stacked at predetermined positions in the circumferential
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`direction al one end in the winding axis direction. Further, when the negative electrode
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`460is stacked by winciing, the plurality of protrusions 421 are stacked at a predetermined
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`position in a circumferential direction different fram a position at which the plurality of
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`protrusions 411 are stacked at one end in the winding axis direction.
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`{0043}
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`As a result, a tab portion 410 formed by stacking a plurality of protrusions 4114 and a tab
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`partion 420 formed by stacking a plurality of protrusions 421 are formed on the electrode
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`body 400. For exampie, the tab partion 410 is gathered toward the center in the stacking
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`direction and joined to the positive electrode current collector 190 by, for example,
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`ultrasonic welding. Further, the tab portion 420 is gathered toward the center in the
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`stacking direction, for example, and is joined to the negative electrode current colfector,
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`for example, by ultrasonic welding.
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`{0049}
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`Note that the tab portions 410 and 420 are portions for introducing and extracting
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`électricity from the electrode body 400, and may be provided with other names such as
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`“Jead (portion)" and “current collector portion".
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`{0050}
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`Here, since the tab portion 410 is formed by laminatingthe protruding portion 444 which
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`is a portion where the base layer is exposed,
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`it becomes a portion which does not
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`contribute io power generation. Similarly, since the tab portion 420 is formed by
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`laminatingthe protruding portion 421 which is a portion where the base layer is exposed,
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`itis a portion which does not contribute to power generation. On the other hand, a portion
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`different from the tab portions 410 and 420 of the electrode bady 400 is formed by
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`laminating a portion where the active material is coated on the base material layer and
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`the separators 470 a anc 470 6, and thus contributes to power generation. Hereinafter,
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`this portion will be referred ta as a body portion 430. Both endsof the main body 430in
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`the X-axis direction become curved portions 431 and 432 whose outer peripheral
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`

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`surfaces are curved. In addition, a portion between the curved portions 431 and 432 in
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`the electrode body 400 becomes a flat portion 433 having a flat outer surface. As
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`described above, the electrode body 400 is formed in an oval shape in which the flat
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`portion 433 is disposed between the 2 curved portions 431 and 432. A side spacer 700
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`is attached to each of the curved portions 431 and 432.
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`f0054]
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`Next, a fixing structure of the positive electrade terminal 200, the insulating member 150,
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`and the lic body 116 will be described. Note that, since the negative electrode side has
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`the same fixing structure as that of the positive electrode side, a description thereof will
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`be omitted.
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`{0052}
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`First, @ configuration of a main portion of ihe positive electrode terminal 200 will be
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`described.
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`[0053]
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`FSS. 4 and 5 are cross-sectional views showing a schematic configuration of a fixing
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`Structure of the positive electrode terminal 200, the insulating member 150, and the fid
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`body 110 according to the embodiment. Specifically, FIG. 4 is a cross-sectional view of
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`the YZ plane inctlucting the line [V-IV in FIG. 2. FIG. 5 is a cross-sectional view showing
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`a state before the positive electrode current collector 190 is assembled to the positive
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`electrode terminal 200, and corresponds to FIG. 4. FIG. 6 is a plan viewof the positive
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`electrode terminal 200 according to the embodiment as viewed from below.
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`{0054}
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`As shown in FIGS. 45 and 6, the positive electrode terminal 200 includes a shaft portion
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`210 and a terminal body portion 220 which supports the shaft portion 210. The shafi
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`portion 210 is formed into a cylindrical shape with an open end, and a positive electrode
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`current collector 190 is joined to an internal space 218 of the shafi partion 210. The
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`terminal body portion 220 is formed in a substantially rectangular shapeso as to be larger
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`than the shaft portion 270 in plan view. On a side surface of the terminal body portion
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`220, a protrusion 227 which is continuous over the entire periphery of the terminal body
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`portion 220 is formed. in the positive electroce terminal 200, an upper surface and an
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`upper side surface of the terminal body portion 220 and an end surface and an inner
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`surface of ihe shaft portion 210 are exposed fram the insulating member 150. On the
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`other hand, a surface of a portion buried in the insulating member 150 becomes a
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`bonding surface with the insulating member 150. On the lower surface 222 of the terminal
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`body 220, an adhesive layer 223 is provided. Specifically, a * multiple annular (in this
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`embodiment, a double annular} adhesive layer 223 which surrounds the shaft portion
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`

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`210 is formed on the lower surface 222.
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`In other words, 2 adhesive layers 223 are
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`provided in the terminal body 220. in this embodiment, the 2 adhesive layers 223 are
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`concentric circles, but they need not be concentric circles, and need not be circular. Also,
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`each of the 2 adhesive layers 223 may have a shape other than a circular shape if His a
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`continuous circular shape.
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`(0055)
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`Next, the shape of the fixing point on the pasitive electrode side of the Iki 170 will be
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`described. FiG. 7 is a plan view showing a schematic configuration of a fixed portion on
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`the pasitive electrocie side of the lic 110 according to the embodiment. in FIG. 7, a2 dot
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`chain line indicates an outer shape of the insulating member 150, and a broken line
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`indicates an outer shape of a portian of the positive electrode terminal 200 exposed from
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`the insulating member 750.
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`[0056]
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`As shown in FIG. 4, FG. 5, and FIG. 7, a first through hole 114 through which the shaft
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`portion 210 of the insulating member 150 and the posifive electrode terminal 200 passes
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`and a pair of 2 through holes 115 through which the insulating member 150 penetrates
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`are formed in the lid body 770. The pair of 2 through holes 115 sandwichthe first through
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`hole 144.
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`GQpposed to each other. The first through hole 114 and the 2 through hole 115 have a
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`circular shape in plan view, and the 2 through hole 115 is formed smaller than the first
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`through hole 114. A region wherethe insulating member 150 is overlapped in the lid 110
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`iS a joining surface with the insulatin