* 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.
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`2. ™"* shows a word which cannot be translated.
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`3. Inthe drawings, any words are not translated.
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`Publication Number
`
`JP T224659A
`
`
`Bibliography
`
`(19) [Publication country] JP
`
`(12) [Kind of official gazette] A
`
`(11) [Publication number] 11224659
`
`(43) [Date of publication of application] 19990817
`
`(54) [Tile of the invention] NONAQUEOUS ELECTROLYTE SECONDARY BATTERY
`
`(51) [international Patent Classification 6th Edition]
`
`HOM 2/12
`
`HOIM 2/34
`
`HOM 10/40
`
`iF]
`HOIM 2/12
`
`104
`
`2/34
`
`10/40
`
`A
`
`Zz
`
`(21) [Application number] 10044675
`
`(22) [Filing date] 19980209
`
`(71) [Applicant]
`
`jName] NIKKISO COLTD
`
`(72) [Inventor]
`
`{Full name] ABE HIROSHI
`
`Abstract
`
`(57) [Overview]
`
`PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary battery
`
`that can prevent its rupture by means of sufficient degassing and can also prevent its
`
`firing by cutting off current when a rupture plate is ruptured.
`
`

`

`SOLUTION: In a nonaqueous elecirolyie secondary baltery 20 in which a rupture plate
`
`21 is so placed in a negative electrode can form a space between a cap 25 to close the
`
`upper surface opening of a bottomed cylindrical negative slecirade can 24 and self, the
`
`iength of a separation pari 23 in the rupture plate 21 is set shorter than the distance from
`
`the rupture plate 21 to the cap 25 and the area of the separation pari of the rupture plate
`
`21 is sét at 5-30% of the cross-sectional area of the negative elecirade can 24. A positive
`
`electrode lead 28 siretched from a positive electrode plate 27 of an electrode included in
`
`the negative electrode 24 is connected to the separate part 23 in the rupture plate 21
`
`and the positive electrode lead 28 is set at a length which is short enough to separate it
`
`fram the separation pari when the separation pari 23 is separated from the rapture plate
`
`2i.
`
`
`Claim
`
`iPatent Claims]
`
`iCclaim 1] In ihe nonaqueous electrolyte secondary batiery, a rupture plate is provided in
`
`a negative electrode can so as to form a predetermined space part between the negative
`
`electrode can and a cap for closing an upper surface opening of the bottomed cylindrical
`
`negative electrode can, and when the internal pressure of the negative electrode can is
`
`increased, a part of the rupture plate is separated toward the space part to prevent the
`
`rupture of ihe rupture plate itself.
`
`in the nonaqueous electrolyie secondary battery, the
`
`iength of a separated part in the burst plate is set shorter than the length between the
`
`burst plate and the cap, and the area of the separated part in the burst plate is 5 to 30%
`
`of the crass-sectional area of the negative electrode can,
`
`iClaim 2] The non-aqueous elecirolyte secondary battery according to claim 1, wherein
`
`&@ positive electrode lead extending from the pasitive electrode plate of the electrode
`
`incorporated in the negative electrode can is connected to the detached portion of the
`
`rupturable plate, anc the positive electrode lead is set to a length such that the positive
`
`electrode lead is separated from the detached portion when the detached portion is
`
`detached fram ihe rupturabile plate.
`
`Description
`iDetailed description of the invention]
`
`fo004]
`
`iTechnical field of invention] The present invention relates to a non-aqueous electrolyte
`
`secondary batiery in which a part of a rupturable plate is separated to release gas and
`
`prevent rupture when an internal pressure is increased, and further relates to a non-
`
`

`

`aqueous electrolyie secondary batlery in which a current can be interrupted when a
`
`separation portion of the rupturable plate is separated.
`
`{O002]
`
`iPrior art] In recent years, electronic devices have been rapidly reduced in size and made
`
`portable.
`
`in this type of electronic device, a nonaqueous elecirolyie secondary battery
`
`using lithium ions has attracted attention as a secondary battery having a high energy
`
`density. This non-aqueous electrolylie secondary battery is used as a power source for
`
`a notebook personal computer, a portable telephone, a video camera, and the like, and
`
`further, application fo a battery for an électrie vehicle and an electric power siorage
`
`system has also been studied.
`
`(OO03}An example of such a nonaqueous electrolyte secondary battery is shownin FIG.
`
`2, in the non-aqueous électrolyte secandary cell 1, first, ihe thin plate-shaped separators
`
`4a are sandwiched between the strip-shaped negative electrode plates 2 and the sirip-
`
`shaped positive electrode plates 3, and the other separators 4b are brought into close
`
`contact with ihe open side surfaces of the posilive electrode plaies 3. Then, inese are
`
`spirally wound to form an electrode 5, and the electrode 5 is loaded in a cylindrical
`
`negative electrode can 6. Al this time, the electrode 5 is impregnated with an electrolytic
`
`solution.
`
`[O004]Next, the disk-shaped rupturable plate 7 and the circular cap 8 having a slightly
`
`raised central portion are superposed on each other, and the packing 9 is wound in a
`
`ring shape so as to sandwich ihe edge portions of the rupturable plate 7 and the cap 8.
`
`Then, the outside of the packing 9 is crimped to the 6a of the opening edge of the
`
`negative electrode can 6 to close the negative electrade can 6. The lower end of the
`
`outer periphery of the negative electrode plate 2 and the bottom of the negative electrode
`
`can 6 are connected by a lead wire 10, and the upper end of the posilive electrode plate
`
`3 and the rupturable plate 7 are connected by a lead wire 114.
`
`fOOO5n the nonaqueous electrolyte secondary battery 1, the positive electrode plate 3
`
`contains a lithlum-containing oxide, and the negative electrode
`
`The plate 2 contains a carbonaceous material such as graphite. The electrolytic solution
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`is formed by dissolving a lithium sali in an organic solvent. Since the chemical activity of
`
`lithium is high and an organic solveni is used, a chemical reaction occurs at the time of
`
`internal short circuit or overcharge to generate ethylene gas, propylene gas, carbon
`
`dioxide gas, or the like, and when the internal pressure increases, the nonaqueous
`
`electrolyte secondary battery 1 may burst.
`
`[0006]Therefore, safety measures are generally taken for such a nonaqueous electrolyte
`
`

`

`secondary batiery 1. In this case, a circular cutout groove 12 is provided in the central
`
`portion of the rupturable plate 7, and a plurality of gas release holes 13 are provided at
`
`predetermined intervals in the cap 3. As a result, when ihe internal pressure of the
`
`negative electrode can 6 is abnormally increased, ine separation portion 14 on ihe center
`
`side of the cutout groove 12 is separated from the other portion of the rupturable plate 7
`
`and is turned up to the ceiling side of the cap 8, so thal the internal gas is released ta
`
`ine ouiside, As a resull, the rupture of the nonaqueous elecirolyie secondary baitery |
`
`can be prevented.
`
`(0007)
`
`Problem to be solved by the invention] However,
`
`in the nonadueous electrolyte
`
`secondary battery 1 as described above, since there is only a small gap between the
`
`rupturable plate 7 and the cap &, ihe detachment portion 14 comes inte contact with the
`
`ceiling portion of the cap 8 and cannot be sufficiently detached fram the other portion of
`
`the rupturable plate 7. For example, a reaction due to an internal short circuit occurs
`
`instantaneously, and ihe nonaqueous electrolyte secondary battery 1 may be ruptured
`
`when degassing cannot be efficiently performed for the reaction. For this reason, there
`
`is @ problern in that ihe non-aqueous electralyte secondary batiery 1 may burst and be
`
`dangerous when ihe detachment portion 14 cannot be sufficiently detached and
`
`sufficient degassing cannot be performed.
`
`(O008}Further,
`
`in the above-described non-aqueous electrolylie secondary battery 7,
`
`even afier ihe detachable portion 14 is detached, ine rupturable plate 7 and the lead wire
`
`ii are stil connected to each other, so that a current flows, which may cause ignition.
`
`The present invention has been made in view of such circumstances, and an object
`
`thereof is to provide a non-aqueous electrolyie secondary battery in which rupture can
`
`be prevented by sufficient degassing, and ignition can be prevented by cutling off a
`
`current when a rupturable plate is ruptured.
`
`[O009}
`
`iMeans for solving the problem] In order to achieve the above object, a nanaqueaous
`
`electrolyie secondary battery according io a first aspect of the present invention is a
`
`nonaqueous electrolyte secondary battery in which a rupturable plate is provided in a
`
`natiomed cylindrical negative electrode can so as to form a space portion between the
`
`rupturable plaie and a cap that closes an upper surface opening of the negative electrode
`
`can,
`
`the nonagueous electrolyte secondary battery comprising: The length of the
`
`separated partion of the rupturable plate is set to be shorter than the length belween the
`
`rupturable plate and the cap, and the area of the separated portion of the rupturable plate
`
`is 5 to 30% of the cross-sectional area of the negative electrode can.
`
`

`

`(O010}in order to prevent the nonaqueous electrolyie secondary batiery from being
`
`ruptured, the inventors of the present invention have found that the area of the detached
`
`partion of ihe rupturable plate is sufficiently large and the inner height of the cap is set
`
`nigh so that the detached portion is completely opened.
`
`The present invention has been completed by paying attention io the effectiveness.
`
`(001 1]That is, in the present invention, ine gap between ihe rupturable plate and the cap
`
`is made large so that the detachable portion of the rupturable plate does not abut against
`
`the celing portion of ihe cap even if the detachable portion is inverted when detached.
`
`This makes ii possible to quickly discharge the gas in the negative electrode can to the
`
`outside. Further, the area of the separated portion is set to a sufficiently large value as
`
`compared with the cross-sectional area of the can, so that ihe opening area of the
`
`rupturable plate for releasing ihe gas is sufficiently secured. As a result, ihe gas in the
`
`negative electrode can can be sufficiently discharged, and the nonaqueous electrolyte
`
`secondary battery can be reliably prevented from bursting due to an increase in the
`
`internal pressure of the negative electrode can.
`
`io012};According ta the secand aspect of the present invention, the posilive slectrade
`
`igad exiending from the positive electrode plate ofthe electrode contained in the negative
`
`electrode can is connected to the detachable partion of the rupturable plate, and the
`
`positive electrode lead is set to have such a length as to be separated from the
`
`detachable portion when the detachable portion is detached from the rupturable plate.
`
`Therefore, when the internal pressure of the negative electrode can is increased and the
`
`separaisd portion of the rupturable plate is separated and increased,
`
`the positive
`
`electrode lead is separated from the separated portion. As a result, the current is
`
`instantaneously cut off to prevent ignition. A non-aqueous electrolyte secondary battery
`
`according to ihe present invention will now be described in detail with reference to the
`
`drawings.
`
`(9013]
`
`iembodiment of invention] FiG. 1 shows a nonaqueous electrolyte secondary datiery 20
`
`according to an embodiment of the present invention.
`
`In the nonaqueous electrolyte
`
`secondary battery 20, the rupturable plate 21 is formed in a disk shape in which the
`
`center side is curved downward, The thickness of the breaking plate 21 varies depending
`
`on the size of the battery, but is usually set to 100 to 300 um. The material of the positive
`
`electrode is not particularly limited as long as it has canductivily, and a metal having a
`
`high electrochemical oxidation potential is used because the posilive electrode is usually
`
`joined to a positive electrode lead. For example, aluminum, titanium, or the like is suitable.
`
`

`

`(00144 circular notched groove 22 is formed on the center side of the breaking plaie 27,
`
`and the center side portion of the notched groove 22 serves as a removal portion 23.
`
`The thickness of the groove portion of the cutout groove 22 is set io 40 ta 70% of the
`
`thickness of the rupturable plate 21. The cross-sectional shape of the cutout groove 22
`
`may be a triangle, a trapezoid, a semicircle, or the like, anc the overall shape thereof
`
`may be a shape other than the above-described circle, and may be a quadrangle or
`
`another polygon.
`
`[00715}The cap 25, which is disposed above the rupturable plate 21 and clases the upper
`
`apening of the negative slectrode can 24, has a central portion 25a protruding upward
`
`fram an edge peripheral portion 256 to be high. The height between the central portion
`
`25a and the detachable portion 23 of the rupturable plate 21 is set to be slightly larger
`
`than the size of the detachable partion 23. Therefore, even when the detachment portion
`
`23 is detached from the other portion of the rupturable plate 21 and is inverted, the
`
`detachment portion 23 does not abut on the ceiling surface of the cap 25.
`
`{0016]The positive electrode piate 27 is wound together with the negative electrode plate
`
`26 in the negative electrode can 24 to form the electrode 30.
`
`A positive electrode iead 28 is extended from the end pari, and the upper end pari is
`
`connected to the separation pari 23 by spot welding. The positive electrode lead 28 is
`
`sét so as io have almost no margin in length, and is separated from the separation portion
`
`23 when the separation porlion 23 is separated fram ihe other portion of the rupturabie
`
`plate 21.
`
`0077]The area of the detachment portion 23 is set to 5% to 30% of ihe cross-sectional
`
`area of the negative electrode can 24. In addition, the gas release hale 29 of the cap 25
`
`is formed to be slightly central portion 25a of the cap 25 is set to be high. The
`
`configuration of other portions is the same as thai of ine nonaqueous electrolyte
`
`secondary battery 1 of the conventional example shown in FIG. 2. Therefore, the same
`
`portions are denoted by the same reference numerals.
`
`(OO18]With such a configuration, when a gas is generated due to an internal short circuit
`
`or overcharging during use of the nonaqueous electrolyte secondary battery 20, the
`
`detachment portion 23 is detached from the other portion of the rupturable plate 217 and
`
`turned up by the internal pressure as indicated by a one dot chain line in FIG. 1.
`
`Therefore, the gas inthe nanaqueaus electralyte secondary batiery 20 is instantaneously
`
`discharged from the opening of the rupturable plate 21 to the outside through ihe gas
`
`release hole 29. This prevenis the nonaqueous electrolyte secondary battery 20 from
`
`exploding. The burst of the nonaqueous electrolyte secondary battery 20 as used herein
`
`

`

`refers to a state in which the cap 25 or the rupturable plate 27 is separated (blown off}
`
`from the battery body or the negative electrode can 24.
`
`(OOISIAI this time, since the positive electrode lead 28 is separated from the separation
`
`portion 23, the current is cut off. As a result, overcharging is prevented and ignition does
`
`not occur. Next, the presence or absence of a burst of the nonaqueous electroiyte
`
`secondary battery by changing the ratio of the area of the detached portion to the cross-
`
`sectional area of the negative electrode can and the presence or absence of ignition Dy
`
`a difference in the connection position of the posilive electrode lead io the rupturable
`
`plate at that time were canfirmed by an experiment. The resulis are shown below.
`
`foO20}The exampie 1 of an experiment
`
`First, various non-aqueous electrolyte secondary batteries were produced under the
`
`folowing conditions. Vapor-grown carbon fibers graphitized at 3000 ° C. were used as a
`
`negative electrode, and lithium cobaitate was used as 2 positive elecirode to obtain a
`
`cylindrical
`
`lithium ion battery having a 1?mm dimension and a 50mm height. The
`
`nonaqueous électrolyiic solution was prepared by dissolving LIPF6 in a mixed solution
`
`of ethylene carbonate, propylene carbonate, and dimethyl carbonate (2:2:5 in a
`
`volumetric ratio) sa as to have a concentration of 1M.
`
`(O02 1]The cross-sectional areas of the batteries were 2cm2. The positive electrode lead
`
`was spot-weided to the detached portion of the rupturable plate. The area ratio of the
`
`breakaway portion (area of breakaway portion / cross-sectional area of negative
`
`electrode can * 100) and the ratio of the height distance between the cap central portion
`
`and the rupturable plate to the diameter of the breakaway portion Gnner height of
`
`breakaway partion / cap x 100) were set as shown in Table 7.
`
`fOo22)A nail penetration test and an overcharge test were carried out using each of the
`
`produced nonaqueous electrolyte secondary batteries. In the nail penetration test, each
`
`of the produced non-aqueous electrolyie secondary batteries was first subjecied to
`
`constant current-constant voltage charging at a current value of 8OOmA and a cell vollage
`of4. iV for 3 hours. And the side surface
`
`A diametrical 2mm nail was passed through the test tube to force an internal short-circuit
`
`fo occur, and it was examined whether or not rupture occurred at that time.
`
`(O023)]As a result, as shown in Tabieé 1,
`
`in Experimental Example A in which the area
`
`ratio was 5% and the height ratio was 70%, Experimental Example B in which the area
`
`ratio was 15% and the height ratio was 80%, and Experimental Example C in which the
`
`area ratio was 30%and the height ratio was 90%, bursting did not occur. In Experimental
`
`Example D in which the area ratio was 3% and the height ratio was 80%, and in
`
`

`

`Experimental Exampie E in which the area ratio was 15% and the height ratio was 110%,
`
`rupture occurred.
`
`[0024] can be seen from the results that the critical point of the area ratio between the
`
`case where ine rupture occurs and the case where the rupture does not occur is between
`
`5% and 3%, and the critical point of the height ratio is between 90% and 110%.
`
`In
`
`addition, the area ratio is set to 360%at ihe maximum for design reasons.
`
`(O025]in the overcharge iest, each of the above-described non-aqueous electrolyte
`
`secondary batteries was overcharged with a current of SA until two or more capacities
`
`thereof were charged. Al this time, whether or nol ignition occurred was examined. As a
`
`resuil, ignition did not occur in all of Experimental Examples Ato E. This shows that it is
`
`effective to connect the positive electrode lead to the detached portion of the rupturable
`
`plate in order io prevent ignition.
`
`O026]The example 2 of an experiment
`
`The positive electrode lead was connected to a partion of the rupturabie plate other than
`
`the separable portion, and the other portions were enurely the same as those in
`
`Experimental Example 1 to produce various nonaqueous electralyie secondary batteries.
`
`These non-aqueous electrolyte secondary balleries were sublected to a nail penetration
`
`iest and an overcharge tesi under the same conditions as in Experimental Example 4.
`
`(O027]As a result,
`
`in the nail penetration test, ihe same results as in Experimental
`
`Example 1 were obtained. That is, in Experimental Example 2, Experimental Example F
`
`is under the same conditions as Experimental Example A, Experimental Example G is
`
`under the same conditions as Experimental Example B, Experimental Example H is
`
`under ihe sarne conditions as Experimental Example C, Experimental Example [is under
`
`the same conditions as Experimental Example D, and Experimental Example J is under
`
`the same conditions as Experimental Example E.
`
`fOO28}in the overcharge test, ignition occurred in all of Experimental Examples F io J. As
`
`a resull, f can be understood that even when the detachment portion is detached and
`
`degassing is performed,
`
`if ihe positive electrode lead and the rupturable plate are
`
`connected to each other as they are, ignition may be caused.
`
`[O029lin the above-described exarnple, the negative electrode can 24 has a cylindrical
`
`shape, and the entire shape of the nonaqueous electrolyte secondary ballery 20 is a
`
`columnar shape. However, the shape of the nanaqueaus electroiyle secondary battery
`
`20 is not imiled to such a shape, and His neediess fo say thal the cross-sectional shape
`
`may be a square shape such as a quadrangle or a hexagon, or a gum shape.
`
`{0030}
`
`

`

`ieffect of the Invention] Since the non-aqueous electrolyte secondary battery according
`
`io the present invention is configured as described above, when the internal pressure of
`
`the negative electrode can increases,
`
`the generated gas can be instantaneously
`
`discharged to the outside in an amount sufficient to prevent ine negative electrode can
`
`fram bursting. At ihe same time when the internal pressure of the negative electrode can
`
`is increased and the separated portion of ihe rupturable plate is separated, the positive
`
`electrode lead is separated from the separated portion to interrupt the current, thereby
`
`preventing the occurrence of ignition.
`
`[Brief Description of the Drawings]
`
`[Fig. 1]FIG.
`
`1
`
`is a cross-sectional view of a nonaqueous electrolyte secondary battery
`
`according to an embodiment.
`
`iFig. 2]fhe cross sectional view of ihe nonaqueous elecirolyie secondary battery by a
`
`conventional case.
`
`iexplanation of letters or numerals}
`
`20: Nonaqueous electrolyte secondary battery
`
`24 0... Rupture disk
`
`23: separation portion
`
`24 negative electrode can
`
`25. C&p
`
`2?¢: positive electrode plate
`
`28: positive electrode lead
`
`30: electrode
`
`iTable 7]
`
`Table 2]
`
`

`

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