throbber
* NOTICE *
`
`dPO and INPIT are not responsible for any damages caused by the use of this transiation.
`
`1. This document has been translated by computer. So the translation may not refiect the original precisely.
`
`2. ™"* shows a word which cannot be translated.
`
`3. Inthe drawings, any words are not translated.
`
`Publication Number
`
`JPHTTPP 2544
`
`
`Bibliography
`
`(19) [Publication country] JP
`
`(12) [Kind of official gazette] A
`
`(11) [Publication number] 11111254
`
`(43) [Date of publication of application] 19990423
`
`(4) [Title of the invention] SEALED BATTERY
`
`(51) [international Patent Classification 6th Edition]
`
`HOM 2/12
`
`HOM 2/04
`
`HOM 2/08
`
`HOIM 2/34
`
`iF]
`HOIM 2/12
`
`104
`
`2/04
`
`2/08
`
`2/34
`
`F
`
`F
`
`A
`
`(21) [Application number] 09268652
`
`(22) [Filing date] 199771004
`
`(71) [Applicant]
`
`Name] TORAY IND INC
`
`(72) [Inventor]
`
`[Full name] YAMAGUCHI SHIN
`
`iFull name} TSU HARUHIKO
`
`jFull name] YOSHIMURA KOSUKE
`
`Abstract
`
`(57) fOverview]
`
`

`

`PROBLEM TO BE SOLVED: To provide a sealed battery, which can prevent the rupture
`
`and explosion of a sheeting can in the case where pressure inside of the sheathing can
`
`is raised by abnormality.
`
`SOLUTION: In a sealed battery, an opening part of a sheathing can for housing power
`
`generating elements 3 is sealed by a seal body 2, which includes an outer terminal plate
`
`¥ having a gas discharge hole 7a, an inner terminal plate 9 having a gas discharge hole
`
`7d and a safety valve plate 8 interposed between bath the terminal plates. In this sealed
`
`battery, the inner terminal plate 9 and the safety valve plate 8 are bonded to each other
`
`SO as to be formed into a ring-shape for integration at a peripheral flange pari of a plate-
`
`like projecting part projected to the inner surface sicie of a battery provided at a nearly
`
`central part af the inner terminal plate 9.
`
`
`Claim
`
`iPatent Claims]
`
`iclaim 1]
`
`In the sealed batiery, an opening part of an outer can housing a power
`
`generating element is sealed by a sealing body including an outer terminal plate having
`
`a gas vent hale, an inner terminal plate having a gas vent hole, and a safety valve plate
`
`interposed between both terminal plates. Wherein ihe inner terminal plate ana ihe safety
`
`valve plate are joined and integrated in a ring shape at an outer peripheral flange portion
`
`of a dish-shaped protruding portion which is provided al a substantially central partion of
`
`the inner terminal plate and proirudes toward an inner surface side of the battery.
`
`(Claim 2] The sealed battery according to claim 1, wherein the inner terminal plate and
`
`the safety valve plate are joined by welding.
`
`iClaim 3] The sealed battery according to claim 1, wherein the inner terminal plate and
`
`the safely valve plate are joined by caulking.
`
`iClaim 4] The sealed battery according to any oné of claims 1 to 3, wherein an electric
`
`resistor ring having a positive temperature coefficient is interposed between the outer
`
`terminal plate and the safety valve plate,
`
`iClaim 5] The sealed battery according to any one of claims 1 io 4, wherein ihe sealed
`
`battery is a lithium battery, a lithium ion battery, or a secondary battery.
`
`Description
`[Detailed description of the invention]
`
`70004]
`
`iTechnical field of invention] The present invention relates to a sealed battery having an
`
`explasion-proof function.
`
`

`

`jo002]
`
`[Prior art] in a sealed baitery using a non-aqueous electrolyte, such as a lithium battery
`
`or a lithium ion battery, when a power generating element in an outer can is overcharged
`
`or a large current flows due to misuse, ihe non-aqueous electrolyle is decomposed to
`
`generate a gas, and the pressure in the outer can is increased to burst or explode the
`
`battery.
`
`(O003]Therefore, in the conventional seaied battery, for example, a measure as shown
`
`in FIG. 4 is taken as an explosion-proof measure when such an abnormality occurs.
`
`(O004}in FiG. 4, reference numeral 61 denotes an outer can, and reference numeral 62
`
`denotes a sealing member attached to an opening of the outer can 61. A power
`
`generating element 63 is housed in the outer can 61. The power generating element 63
`
`has a structure in which 4 laminate of a positive electrode 64, a separator 65, and a
`
`negative electrode 66 is spirally wound and filled with a non-aqueous electrolyte.
`
`[0005]On the other hand, the sealing body 62 is formed by interposing a safety vent plate
`
`66 between an inner terminal plate G9 having a gas vent hole 69a and an outer terminal
`
`plate 67 similarly having a gas veni hole 67a and a cutting edge 57b, and is integrated
`
`by caulking the peripheral edge with the inner terminal plate 69. Each of the inner
`
`terminal plate 69, the outer terminal plate G7, and the safety valve plate 65 is made of a
`
`conductive material, and is fixed ta the outer can 61 via an electrically insulating gasket
`
`79. The inner terminal plate 69
`
`The surface and the posilive electrode 64 of the power generating element 63 are
`
`connected by a lead wire 74 so that a current flows fram the power generating slement
`
`63 to the outer terminal plate G7 through the inner terminal plate 69 and the safety vaive
`
`plate 68.
`
`{O00G6]In the above constitution, when gas is generated due to abnormality of the power
`
`generating elements 63 and the inside of the outer can 61 is pressurized, the safety vent
`
`plate 68 is expanded to the side of the outer terminal plate 67 and brought into contact
`
`wiih tne 67b of the culling blade to be broken. For example, Japanese Ulliy Model
`
`Publication No. Hei 7 (1995) - 18126 discloses a cell having a so-called explosion-proof
`
`function in which the gas in the cell is discharged to the outside of ihe cell through the
`
`67a of the gas vent hole of the outer plate 67 to preveni the outer can 61 from bursting
`
`under high pressure.
`
`iO007However, in the conventional sealed batiery having the explosion-proof function,
`
`the sealing body 62 is formed by stacking the inner terminal plate 69, the safety valve
`
`plate 68, and the outer terminal plate 67 and caulking the peripheral edges thereof,
`
`

`

`Therefore, when the internal pressure of ihe bDatiery increases, the peripheral edge
`
`portion of the safety valve plate 68 slips through the caulked portion and does not
`
`sufficiently expand toward the external terminal plate 67 side, so that there is a problem
`
`thai the breaking pressure of the safety valve plate 68 becomes unsiable or a slight
`
`increase in pressure causes leakage. Further, in the operation of incorporating the safety
`
`valve plate 66 into the inner terminal plate 69, there has been a problem that the breaking
`
`pressure of the safety vaive plate 68 becomes unsiabie due io the occurrence of a center
`
`deviation ar a scratch caused by a burr or an edge portion of the outer terminal plate 67.
`
`{O008]
`
`Problem to be solved by the invention] To provide a sealed batiery capable of surely
`
`preventing burst and explosion of an outer package can when pressure in the outer
`
`package can rises due to abnormality.
`
`{O009}
`
`iMeans for solving the problem] The configuration of the present invention for achieving
`
`the above object is as follows.
`
`fOO1O}in the sealed battery, an opening of an outer can housing a power generating
`
`element is sealed with a sealing Doady including an outer terminal plate having a gas vent
`
`nolé, an inner terminal plate having a gas vent hole, and a safety vaive plate interposed
`
`between both the terminal plates. The inner terminal plate and the safety valve plate are
`
`joined and integrated in a ring shape al an outer peripheral flange partion of a dish-
`
`shaped protruding portion which is provided at a subsiantially central portion of ihe inner
`
`terminal plate and protrudes toward an inner surface side of the battery.
`
`1001 TAs a joining method of the inner terminal plate and the safety vaive plate, welding
`
`or caulking is preferable.
`
`[(O012]Preferably, an electric resistor ring having a positive temperature coefficient is
`
`interposed between the outer terminal plate and ihe safety vaive plate. An electric
`
`resistor (Positive Temperature Coefficient , hereinafter referred io as PTC) having a
`
`positive temperature coefficient, which is effective for mainiaining safety at the time of
`
`abnormal temperature rise,
`
`is a resistor whose electric resisiance increases as the
`
`temperature rises. As such a PTC, for example, a combination of conductive carbon and
`
`polyolefin or fluorine resin may be used.
`
`it may be carposed of a mbdure with a polymer such as a fal.
`
`0073}The sealed battery of the present invention is effective as a baitery having a high
`
`energy density, such as a lithium battery or a lithium ion battery, or as a secondary
`
`battery that can be repeatedly used by being charged.
`
`

`

`O04 4]
`
`Embodiment of invention] Hereinafter, the present invention will be described in more
`
`detail based on an embodiment shown in the drawings.
`
`(OO15]FIG.
`
`1
`
`is a schematic vertical cross-sectional view of a sealed battery according
`
`to one embodiment of the present invention.
`
`O076}in FiG. 1, an ouier can 1
`
`is made of a conductive material such as siainiess steel
`
`or nickel-plated carbon steel, and accommodates a power generating elemeni 3. The
`
`power generating element 3 has a structure in which a laminate of a sheet-like positive
`
`electrode 4, a separator 5, and a negative electrode 6 is wound, for example, in a spiral
`
`shape and filled with a non-aqueous electrolytic solution. A partition plate 14 for
`
`partitioning between the upper surface of the power generating elements 3 and the
`
`sealing Dady 2 is provided at ihe apening of ihe outer can 1, and a gas venting hole 14a
`
`for venting gas is provided in the partition plate 14.
`
`[0017]The sealing body2 is formed by interposing a safely vent plate 8 between an outer
`
`terminal plate 7 having a vent hele 7a and an inner terminal plate 9 having the same vent
`
`hole 9a. Eachof the outer terminal plate 7, the safety valve plate 8, and the inner terminal
`
`plate 9 is made of a conductive material such as stainiess steel, nickel-plated carbon
`
`steel, or aluminum. The sealing body 2 is crimped to the opening of the outer can 1 via
`
`&@ gasket 13 made of an insulating material such as rubber ar plastic.
`
`(O078}The outer terminal plate 7 and ihe safety valve plate 4 are integrated at their
`
`peripheral edges by a caulking ring 12 of a fastening element.
`
`(O019}The plate 9 and the plate 8 are joined and integrated in a ring shape at the 9b of
`
`the outer perigheral flange part of a dish-like projecting part provided al the nearly central
`
`part of the plate 9 and projected to the inner surface side of the cell.
`
`[OO20}in the 9b of the outer peripheral flange part, the joining of the inner terminal plate
`
`9 and the relief valve plate 8 is performed by a weld such as an ultrasonic weld, a laser
`
`weld or a resistance weld, and by integrally welding in a ring shape, the peripheral edge
`
`part of the relief valve plate & is prevented from silpping oul of the caulked pari of the
`
`peripheral edge part. Further, the pressure receiving area of the safety valve plate 3 is
`
`kept constant, the strain of the safety valve plate 8 due io the caulking force of the
`
`peripheral edge part is reduced, and when the pressure in the outer can 1
`
`is increased
`
`by the abnormality of the power generating element 3, ihe cleavage strength of the safety
`
`valve plate & is stabilized.
`
`O027}The joint between ihe plate 9 and the plate 4 in the Ob of the flange part is
`
`preferably in a range from the outer periphery of the projection dhe inner periphery of
`
`the flange part} to the inner periphery of the ring 10 (@ part not overlapping with the ring
`
`

`

`10}.
`
`O0221As shown in FIG. 1,
`
`in the case where the peripheral edge portion of the safety
`
`valve plate & is sandwiched and caulked between the inner terminal plate 9 and the outer
`
`terminal plate 7, the penpheral edge overlapping portion of ihe inner terminal plate 9 and
`
`the safety vaive plate $ is bent.
`
`By maintaining airtightness with a sealing agent or the like, the weiding of the ring-
`
`shaped welded portion can be canfigured as intermittent weiding or the like that does nat
`
`require aintighiness. Further, by continuously welding the inner terminal plate 9 and the
`
`safety valve plate & in a ring shape overthe entire circumference to maintain airtightness,
`
`it is possible to prevent gas leakage from the laminated partion even if no means for
`
`mainiaining ainightness is provided in the laminated portion of ihe inner terminal plate 9
`
`and the safety valve plate 8.
`
`(0023]F urther, evaluation such as a cleavage strength test of the safety vaive plate 6 and
`
`a sealing property test of a joint part can be performed only by a combination of ihe inner
`
`terminal plate 9 and the safety valve plate & withoul integrating the safety vaive plate 8
`
`wih other paris such as the outer terminal plate 7 and the PTC ring 10 by caulking 4
`
`peripheral edge part, and productivity of the battery is improved.
`
`[O024]it is preferable that the safety valve plate & is formed in a flat plate shape, the
`
`shape of the safely valve plate 8 becomes simple, ihe cleavage strength of ihe safely
`
`valve plate & can be selected to a required strength, ihe cleavage accuracy can be
`
`improved, and the cost can be reduced. Further, the safety vent plate 8 may be provided
`
`with a thin portion (groove) Sa having an arbitrary shape such as a circular shape, a
`
`polygonal shape, an H-shape, or the like, so as to obtain a predetermined breaking
`
`strength. By welding the inner terminal plate 9 and the safety valve plate 8, electric
`
`resistance from the inner terminal plate to the safety vaive plaie can be made extremely
`
`small. The inner terminal plate 9 may be made of a chemically stable stainiess steel, an
`
`elastic conductor such as aluminum or spring steel, or a laminate of an slastic conductor
`
`fim and a highly conductive metal fim such as aluminum.
`
`o025]The crimp ring 12 may be made of a conductive material such as stainless siee!,
`
`nickéel-plated carbon steel, or aluminum, or may be made of or coated with an electrically
`
`insulating material such as rubber or plastic.
`
`(O026]Further, a seal
`
`ring 11 having electrical
`
`insulation and airtighiness may be
`
`interposed between the caulking ring 12 and the outer terminal plate ¢ and between the
`
`caulking ring 12 and the safety valve plate 8, and the outer terminal plate 7, the safety
`
`valve plate 8, and the seal ring 11 may be integrated by the caulking ring 12.
`
`

`

`(0027]By inierposing the PTC ring 10 between the outer terminal plate 7 and the safety
`
`valve plate 8, when the temperature of the power generating element 3 rises due to an
`
`abnormality, ihe electrical resistance of ihe PTC ring 16 increases, and the current to the
`
`outer terminal plate 7 can be reduced or interrupted, which is preferable.
`
`fOO28yin FIG. 1, ihe safety vent plate 8 is sandwiched between the inner terminal plate 9
`
`and ihe PTC ring 10, bul ihe outer diameter of the safety vent plate & may be the same
`
`as inal of ine ring-shaped welded portion 9b, that is, the outer diameter of the safety vent
`
`plate 8 may be smaller than that of the PTC ring 10, and the inner terminal plate 9 and
`
`the PTC ring 10 may be in direct contact with each other. In this case, the safety valve
`
`plate & is detached from the caulking pari of the peripheral edge pari, and the cleavage
`
`pressure is stabilized without being affected by distortion or the like due to the caulking
`
`farce of the peripheral edge par.
`
`(O029}One end of the lead 15 is connected to the positive electrode 4 of the electrode
`
`assembly 3 through the gas vent 14a of the partition plate 14. The other end is welded
`
`to the lower surface of the inner terminal plate 9 by ultrasonic welding, laser welding, or
`the like.
`
`(OOSOIFIG. 2 is a schematic longitudinal sectional view of a main part of a sealed battery
`
`according to another embodiment of the present invention. The gasket 17 made of an
`
`electrically insulating material is formed by integrating the gasket 13, the seal ring 11,
`
`and the caulking ring 12 shown in FIG. 1, and has respective functions. Thus, the number
`
`of components can be reduced.
`
`O037}The plate 7 and ihe plate ¢ are slacked on a gasket 17 arid fixed by a claw part
`
`17a of a peripheral edge rising pari of the gasket 17.
`
`[(OOS2]FIG. 3 is a schematic longitudinal sectional view of a main part of a sealed battery
`
`according to still another embodiment of the present invention.
`
`In FIG. 3, the inner
`
`terminal plate 9 and the safety valve plate 8 are integrally bonded to each other by a
`
`bonding member 16 around the inner terminal plate dish-shaped partion. As shown in
`
`Fig.3, a dent is provided around the dished pari of the inner tag block 9, ihe safe poris
`
`plate 8 is piled up, and itis joined by what is called caulking thal pushes in and fixes the
`
`protruding part provided io the joining member 6. With such a configuration,
`
`the
`
`pressure-receiving area of the safety valve plate & can be kept constant, and the
`
`cleavage strength of the safety valve plate 8 can be stabilized when the pressure in the
`
`outer can 1
`
`increases due ta an abnormality of the power generating element 3.
`
`In
`
`addition, it is possible to reliably seal the joint portion between the inner terminal plate 9
`
`and the safety vaive plate 8.
`
`

`

`(O033]Furiher, the evaluation such as the breaking strength test of the safety vent plate
`
`8 and the sealing property test of the joining portion can be carried out only by the
`
`combination of the inner terminal plate 9 and the safety vent plate § without incorporating
`
`the safety vent plate & into the cell or combining the safety vent plaie & with other paris
`
`such as the outer terminal plate 7 and the side PTC10 to caulk and integrate the
`
`peripheral edge portion.
`
`(O034]The ijcining member 16 may be made of a conductive material such as stainiess
`
`steel, nickel-plated carbon steel, or aluminum, which are the same as those of the inner
`
`terminal plate 9 and the safety valve plate & or an electrically insulating material such
`
`as rubber or plastic.
`
`(O035]
`
`ieffect of ihe Invention] in a sealing body comprising an outer terminal plate, a safety
`
`valve plate, and an inner terminal plate, the inner terminal plate and the safety valve
`
`plate are joined and integrated in a ring shape around a dish-shaped part of the inner
`
`terminal plate, so that a peripheral edge caulking pari of the safety valve plate dees not
`
`slip through and a pressure receiving area of the safety valve plaie becames constant.
`
`Therefore, ihe rupture strengih of the safety vaive plate can be stabilized, and the battery
`
`outer can can be prevented from bursting or exploding when an abnormality occurs.
`
`[O036]The inner terminal plate and the safety valve plate are joined and integrated in a
`
`ring shape around the inner terminal plate dish-shaped part.
`
`Thereby, gas leakage from the laminated pari of the inner terminal plate and the safety
`
`valve plate is eliminated, and the nonaqueous siectrolytic solution can be sealed in the
`guier can.
`
`(0037]Further, by integrally bonding the inner terminal plate and the safety valve plate,
`
`the evaluation of the cleavage strengih of the safety vaive plate, the sealing property of
`
`the bonding portion, and the like can be performed only by the combination of the inner
`
`terminal plate 9 and the safety valve plate ¢, and the productivity of the batlery is
`
`improved.
`
`O038}Further, by interposing the PTC ring between the outer terminal plate and the
`
`safety valve plate, when the temperature of ihe power generating element rises due to
`
`an abnormality, the electric resistance of the PTC ring increases, so that the current to
`
`the outer terminal plate can be reduced or interrupted.
`
`[Brief Description of the Drawings]
`
`iFig. 1]FIG.
`
`1
`
`is a schematic vertical cross-sectional view of a sealed battery according
`
`

`

`io one embodiment of the present inveniion.
`
`IFig. 2]F IG. 10 is a schematic vertical cross-sectional view of a main part of a sealed
`
`batiery according to another embodiment of the present invention.
`
`irig. S]FIG. 10 is a schematic vertical cross-sectional view of a main part of a sealed
`
`batiery according to still another embodiment of the present invention.
`
`iFig. 4} is outline drawing of longitudinal section of ihe conventional encapsulated type
`
`battery.
`
`[Explanation of letters or numerals]
`
`: Armor Can
`
`: Obturation Object
`
`: Power Generation Element
`
`: Pasitive Electrode
`
`1 2 3 4
`
`5: Separator
`
`6: Anode
`
`7: outer terminal plate
`
`7a: Degassing Hole
`8: Safe Poris Plate
`
`8a: inin-walled portion (groove)
`
`9: inner terminal plate
`
`9a: Degassing Hole
`
`9b: outer peripheral flange portion of the dish-shaped protrusion
`
`10: resistor ring with posifive temperature coefficient (PTC ring)
`
`i: Seal Ring
`
`i2: Caulking Ring
`
`13: Gasket
`
`14: Partition Plate
`
`i4a: Degassing Hole
`15: Lead
`
`16: Joining Member
`
`17: Gasket
`
`17a: Nal Par
`
`

`

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