JP2020092048A - Secondary battery - Google Patents
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- JP2020092048A JP2020092048A JP2018229803A JP2018229803A JP2020092048A JP 2020092048 A JP2020092048 A JP 2020092048A JP 2018229803 A JP2018229803 A JP 2018229803A JP 2018229803 A JP2018229803 A JP 2018229803A JP 2020092048 A JP2020092048 A JP 2020092048A
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- secondary battery
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- 238000010030 laminating Methods 0.000 abstract description 4
- 238000003825 pressing Methods 0.000 description 11
- 238000006073 displacement reaction Methods 0.000 description 6
- 238000010008 shearing Methods 0.000 description 5
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000008151 electrolyte solution Substances 0.000 description 4
- 229910001416 lithium ion Inorganic materials 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 239000007773 negative electrode material Substances 0.000 description 3
- 239000007774 positive electrode material Substances 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 150000001768 cations Chemical class 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000003125 aqueous solvent Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 239000005001 laminate film Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
Description
本発明は、例えばリチウムイオン電池などの二次電池に関する。 The present invention relates to a secondary battery such as a lithium ion battery.
従来、この種の二次電池として例えば特許文献１に示すものが知られている。こうした二次電池は、矩形状の正極板と負極板とがつづら折りされたセパレータを介して交互に複数積層されてなる積層体を電解液と共に外装体に封止することによって形成される。この場合、正極板の一端部及び負極板の一端部にはそれぞれタブ状の正極端子及びタブ状の負極端子が一体形成されており、正極端子及び負極端子はセパレータから突出している。さらにこの場合、正極板及び負極板はいずれも金属箔によって構成され且つセパレータは熱可塑性樹脂からなる薄い帯状の多孔質体によって構成されているため、セパレータは正極板及び負極板に比べて格段に脆弱になっている。 Conventionally, as a secondary battery of this type, for example, one disclosed in Patent Document 1 is known. Such a secondary battery is formed by sealing a laminated body in which a plurality of rectangular positive electrode plates and negative electrode plates are alternately laminated with separators folded between them into an outer package together with an electrolytic solution. In this case, a tab-shaped positive electrode terminal and a tab-shaped negative electrode terminal are integrally formed at one end of the positive electrode plate and one end of the negative electrode plate, respectively, and the positive electrode terminal and the negative electrode terminal project from the separator. Further, in this case, since the positive electrode plate and the negative electrode plate are both made of a metal foil and the separator is made of a thin strip-shaped porous body made of a thermoplastic resin, the separator is much more remarkable than the positive electrode plate and the negative electrode plate. It is vulnerable.
ところで、上述のような二次電池では、複数の正極板同士及び複数の負極板同士はいずれも積層方向で輪郭が揃うように積層されているので、積層体の端縁部は切り立った絶壁形状となる。このため、積層体は、剛性が高くなり、端縁部が撓み難い状態になっている。この状態で、特に積層体の端縁部に対して積層方向における押圧力が作用した場合には、正極板及び負極板の端縁が刃となってセパレータに対して剪断力が作用し、セパレータが破断されることがあるという問題がある。 By the way, in the secondary battery as described above, since the plurality of positive electrode plates and the plurality of negative electrode plates are laminated so that the contours thereof are aligned in the laminating direction, the edge of the laminated body has a steep cliff shape. Becomes For this reason, the laminated body has high rigidity, and the edge portion is in a state of being difficult to bend. In this state, in particular, when a pressing force in the stacking direction acts on the edge portion of the laminate, the edge edges of the positive electrode plate and the negative electrode plate act as a blade, and a shearing force acts on the separator. May be broken.
本発明は、このような従来技術に存在する問題点に着目してなされた。その目的は、外力の作用によってセパレータが破断することを抑制できる二次電池を提供することにある。 The present invention has been made by paying attention to the problems existing in such a conventional technique. It is an object of the present invention to provide a secondary battery that can prevent the separator from breaking due to the action of an external force.
以下、上記課題を解決するための手段及びその作用効果について記載する。
上記課題を解決する二次電池は、正極集電体を有した正極板と、負極集電体を有した負極板とがセパレータを介して交互に複数積層されてなる電極積層体を備えた二次電池であって、複数の前記正極板及び複数の前記負極板のうちの少なくとも一方は、一部の位置が積層方向と交差する方向にずれるように積層されていることを要旨とする。
Hereinafter, the means for solving the above problems and the effects thereof will be described.
A secondary battery which solves the above-mentioned problems, a positive electrode plate having a positive electrode current collector, and a negative electrode plate having a negative electrode current collector is provided with an electrode laminate in which a plurality of layers are alternately laminated via a separator. In the secondary battery, at least one of the plurality of positive electrode plates and the plurality of negative electrode plates is laminated so that a part of the positions is displaced in a direction intersecting the laminating direction.
この構成によれば、複数の正極板同士及び複数の負極板同士のうちの少なくとも一方は、一部の位置が積層方向と交差する方向にずれるように積層されているため、電極積層体の端縁部が撓み易い状態になる。このため、電極積層体の端縁部に対して積層方向における押圧力が付与された場合には、正極板及び負極板のうちの少なくとも一方の端縁部がセパレータと一緒に撓むので、セパレータが破断され難くなる。したがって、外力の作用によってセパレータが破断することを抑制できる。 According to this configuration, at least one of the plurality of positive electrode plates and the plurality of negative electrode plates are stacked so that some positions are displaced in the direction intersecting the stacking direction, and therefore, the ends of the electrode stack are stacked. The edge is easily bent. Therefore, when a pressing force in the stacking direction is applied to the edge portion of the electrode laminate, at least one edge portion of the positive electrode plate and the negative electrode plate bends together with the separator. Is difficult to break. Therefore, the breakage of the separator due to the action of the external force can be suppressed.
本発明によれば、外力の作用によってセパレータが破断することを抑制できる。 According to the present invention, breakage of the separator due to the action of external force can be suppressed.
以下、二次電池の一実施形態を図面に従って説明する。
図１に示すように、例えばリチウムイオン電池などによって構成される二次電池１１は、矩形状の外装体１２内に電極積層体１３及び電解液を封止することによって形成される。なお、以下の説明では、上述の外装体１２の短辺に沿う短手方向を第１方向Ｘとし、外装体１２の長辺に沿う長手方向を第２方向Ｙとし、第１方向Ｘ及び第２方向Ｙの両方と直交する方向を第３方向Ｚとする。
Hereinafter, an embodiment of a secondary battery will be described with reference to the drawings.
As shown in FIG. 1, a secondary battery 11 composed of, for example, a lithium ion battery is formed by sealing an electrode laminated body 13 and an electrolytic solution in a rectangular outer casing 12. In the following description, the lateral direction along the short side of the exterior body 12 is referred to as a first direction X, and the longitudinal direction along the long side of the exterior body 12 is referred to as a second direction Y. A direction orthogonal to both the two directions Y is referred to as a third direction Z.
外装体１２は、例えばアルミニウムを用いた一対の矩形状をなす可撓性のラミネートフィルムの周縁部同士を溶着することによって形成される。外装体１２における第２方向Ｙの一端部には正極端子１４が露出しており、他端部には負極端子１５が露出している。電解液には、非水系溶媒に電解質を溶解したものが用いられる。 The outer package 12 is formed by welding the peripheral portions of a pair of rectangular flexible laminate films made of aluminum, for example. The positive electrode terminal 14 is exposed at one end of the exterior body 12 in the second direction Y, and the negative electrode terminal 15 is exposed at the other end. As the electrolytic solution, a solution obtained by dissolving an electrolyte in a non-aqueous solvent is used.
図２及び図３に示すように、電極積層体１３は、矩形状の正極板１６と、正極板１６よりも一回り大きい矩形状の負極板１７とが、山折りと谷折りを交互に繰り返すつづら折りされた帯状のセパレータ１８を介して、交互に複数積層されることによって形成される。この場合、セパレータ１８の一方側の対向する面同士の間には正極板１６がそれぞれ挟まれ、他方側の対向する面同士の間には負極板１７がそれぞれ挟まれる。 As shown in FIGS. 2 and 3, in the electrode laminate 13, a rectangular positive electrode plate 16 and a rectangular negative electrode plate 17 which is slightly larger than the positive electrode plate 16 alternately repeat mountain folds and valley folds. It is formed by alternately laminating a plurality of strip-shaped separators 18 that are zigzag folded. In this case, the positive electrode plate 16 is sandwiched between the facing surfaces on one side of the separator 18, and the negative electrode plate 17 is sandwiched between the facing surfaces on the other side.
セパレータ１８は、絶縁性樹脂材料製の不織布によって構成されている。セパレータ１８における隣り合う２つの折り目間の矩形板状の部分は、負極板１７よりも一回り大きくなっている。なお、本実施形態では、正極板１６及び負極板１７が積層される積層方向が電極積層体１３の厚さ方向ともなる第３方向Ｚと一致している。 The separator 18 is made of a non-woven fabric made of an insulating resin material. The rectangular plate-shaped portion between two adjacent folds in the separator 18 is slightly larger than the negative electrode plate 17. In the present embodiment, the stacking direction in which the positive electrode plate 16 and the negative electrode plate 17 are stacked coincides with the third direction Z which is also the thickness direction of the electrode stack 13.
正極板１６は、例えば厚さが１０〜２０μｍのアルミニウム箔などの導電性材料によって構成される正極集電体１９と、正極集電体１９の両面または片面に塗布された正極活物質とを有している。正極活物質は、例えばリチウムイオンなどの陽イオンを吸蔵及び放出可能な材料によって構成される。 The positive electrode plate 16 has a positive electrode current collector 19 made of a conductive material such as an aluminum foil having a thickness of 10 to 20 μm, and a positive electrode active material applied to both surfaces or one surface of the positive electrode current collector 19. is doing. The positive electrode active material is made of a material capable of storing and releasing cations such as lithium ions.
正極集電体１９は、略矩形板状をなしており、その長手方向となる第２方向Ｙの一端部から突出する矩形板状の正極タブ部２０を有している。すなわち、正極タブ部２０は、正極集電体１９と一体形成されており、セパレータ１８から露出するように第２方向Ｙの外側に突出している。各正極タブ部２０は、正極端子１４（図１参照）と電気的に接続されている。正極タブ部２０には、正極活物質が塗布されない。 The positive electrode current collector 19 has a substantially rectangular plate shape, and has a rectangular plate-shaped positive electrode tab portion 20 protruding from one end portion in the second direction Y, which is the longitudinal direction thereof. That is, the positive electrode tab portion 20 is integrally formed with the positive electrode current collector 19 and projects outward in the second direction Y so as to be exposed from the separator 18. Each positive electrode tab portion 20 is electrically connected to the positive electrode terminal 14 (see FIG. 1). The positive electrode active material is not applied to the positive electrode tab portion 20.
負極板１７は、例えば厚さが１０〜２０μｍの銅箔などの導電性材料によって構成される負極集電体２１と、負極集電体２１の両面または片面に塗布された負極活物質とを有している。負極活物質は、例えばリチウムイオンなどの陽イオンを吸蔵及び放出可能な材料によって構成される。負極集電体２１は、略矩形板状をなしており、その長手方向となる第２方向Ｙの一端部から突出する矩形板状の負極タブ部２２を有している。 The negative electrode plate 17 has a negative electrode current collector 21 made of a conductive material such as a copper foil having a thickness of 10 to 20 μm, and a negative electrode active material applied to both surfaces or one surface of the negative electrode current collector 21. is doing. The negative electrode active material is made of a material capable of inserting and extracting cations such as lithium ions. The negative electrode current collector 21 has a substantially rectangular plate shape, and has a rectangular plate-shaped negative electrode tab portion 22 protruding from one end portion in the second direction Y, which is the longitudinal direction thereof.
すなわち、負極タブ部２２は、負極集電体２１と一体形成されており、セパレータ１８から露出するように第２方向Ｙの外側に突出している。この場合、負極タブ部２２は、第２方向Ｙにおいて正極タブ部２０側とは反対側の方向に突出している。すなわち、負極タブ部２２の突出方向Ｙ２と、正極タブ部２０の突出方向Ｙ１とは、第２方向Ｙにおける互いに反対の方向になっている。換言すれば、負極タブ部２２の突出方向Ｙ２及び正極タブ部２０の突出方向Ｙ１は、いずれも第２方向Ｙと平行な方向である。各負極タブ部２２は、負極端子１５（図１参照）と電気的に接続されている。負極タブ部２２には、負極活物質が塗布されない。 That is, the negative electrode tab portion 22 is integrally formed with the negative electrode current collector 21, and projects outward in the second direction Y so as to be exposed from the separator 18. In this case, the negative electrode tab portion 22 projects in the direction opposite to the positive electrode tab portion 20 side in the second direction Y. That is, the protruding direction Y2 of the negative electrode tab portion 22 and the protruding direction Y1 of the positive electrode tab portion 20 are opposite to each other in the second direction Y. In other words, the protruding direction Y2 of the negative electrode tab portion 22 and the protruding direction Y1 of the positive electrode tab portion 20 are both parallel to the second direction Y. Each negative electrode tab portion 22 is electrically connected to the negative electrode terminal 15 (see FIG. 1). The negative electrode active material is not applied to the negative electrode tab portion 22.
図２、図４、及び図５に示すように、電極積層体１３における複数の正極板１６は、一部の位置が正極タブ部２０の突出方向Ｙ１と直交する方向である第１方向Ｘに平行にずれるように積層されている。本実施形態の電極積層体１３では、第３方向Ｚに積層される複数の正極板１６が一枚置きに第１方向Ｘにずれるように積層されている。 As shown in FIG. 2, FIG. 4, and FIG. 5, the positive electrode plates 16 in the electrode stack 13 are partially positioned in the first direction X, which is a direction orthogonal to the protruding direction Y1 of the positive electrode tab portion 20. They are stacked so that they are parallel to each other. In the electrode laminated body 13 of the present embodiment, a plurality of positive electrode plates 16 laminated in the third direction Z are laminated so that every other positive electrode plate 16 is displaced in the first direction X.
この場合、第１方向Ｘにずらす正極板１６のずらし量は、正極集電体１９の厚さの４倍以上（本例では図８に示すように４倍）であって且つ当該正極板１６が第３方向Ｚで対向する負極板１７を越えない範囲に設定されることが好ましい。そして、複数の正極板１６を一枚置きに第１方向Ｘに正極集電体１９の厚さの４倍以上ずれるように積層することで、複数の正極板１６の第１方向Ｘにおける端縁部２３（ずれた部分）が第３方向Ｚに十分に撓みやすくなる。 In this case, the amount of displacement of the positive electrode plate 16 displaced in the first direction X is four times or more the thickness of the positive electrode current collector 19 (four times as shown in FIG. 8 in this example) and the positive electrode plate 16 is displaced. Is preferably set in a range not exceeding the negative electrode plates 17 facing each other in the third direction Z. Then, by stacking the plurality of positive electrode plates 16 every other sheet so as to be displaced in the first direction X by at least four times the thickness of the positive electrode current collector 19, the edges of the plurality of positive electrode plates 16 in the first direction X are stacked. The portion 23 (the shifted portion) becomes sufficiently flexible in the third direction Z.
図２及び図５に示すように、電極積層体１３における複数の負極板１７は、一部の位置が負極タブ部２２の突出方向Ｙ２に平行にずれるように積層されている。本実施形態の電極積層体１３では、第３方向Ｚに積層される複数の負極板１７が一枚置きに第２方向Ｙにずれるように積層されている。 As shown in FIG. 2 and FIG. 5, the plurality of negative electrode plates 17 in the electrode laminate 13 are laminated so that some positions are displaced in parallel to the protruding direction Y2 of the negative electrode tab portion 22. In the electrode laminated body 13 of the present embodiment, the plurality of negative electrode plates 17 laminated in the third direction Z are laminated so as to be displaced in the second direction Y every other sheet.
この場合、第２方向Ｙにずらす負極板１７のずらし量は、負極集電体２１の厚さの４倍以上（本例では図８に示すように４倍）であって且つ当該負極板１７が第３方向Ｚで対向するセパレータ１８を越えない範囲に設定されることが好ましい。そして、複数の負極板１７を一枚置きに第２方向Ｙに負極集電体２１の厚さの４倍以上ずれるように積層することで、複数の負極板１７の第２方向Ｙにおける端縁部２４（ずれた部分）が第３方向Ｚに十分に撓みやすくなる。 In this case, the amount of displacement of the negative electrode plate 17 displaced in the second direction Y is four times or more the thickness of the negative electrode current collector 21 (four times as shown in FIG. 8 in this example) and the negative electrode plate 17 is displaced. Is preferably set in a range that does not exceed the separator 18 facing in the third direction Z. Then, by stacking the plurality of negative electrode plates 17 every other sheet so as to be displaced in the second direction Y by at least four times the thickness of the negative electrode current collector 21, the edges of the plurality of negative electrode plates 17 in the second direction Y are stacked. The portion 24 (the shifted portion) is sufficiently easily bent in the third direction Z.
ここで、複数の正極板１６を一枚置きに第１方向Ｘに正極集電体１９の厚さの４倍以上ずれるように積層することで、複数の正極板１６の第１方向Ｘにおける端縁部２３（ずれた部分）が第３方向Ｚに十分に撓みやすくなる理由について図６及び図７に基づいて説明する。 Here, by stacking a plurality of positive electrode plates 16 every other sheet so as to be displaced in the first direction X by at least four times the thickness of the positive electrode current collector 19, the ends of the plurality of positive electrode plates 16 in the first direction X are stacked. The reason why the edge portion 23 (shifted portion) is easily bent in the third direction Z will be described with reference to FIGS. 6 and 7.
図６に示すように、正極集電体１９の厚さがｔである２枚の正極板１６を上下に積層し、上側の正極板１６の端縁部２３を下側の正極板１６の端縁部２３よりも第１方向Ｘの外側に突出するようにずらした場合、上側の正極板１６の端縁部２３を構成する突出部分Ａに力をかけて突出部分Ａを下側の正極板１６の輪郭に沿って折り曲げるためには、突出部分Ａの突出長さが最低でも３ｔ分（折り曲げる部分に２ｔ分必要で、力をかける部分にｔ分必要）必要である。そして、図７に示すように、円滑に上側の正極板１６の突出部分Ａを十分に撓ませるためには、上述した突出部分Ａの最低の突出長さ分の３ｔに余裕分としてさらにｔ分追加して突出部分Ａの突出長さを４ｔとすることが好ましい。 As shown in FIG. 6, two positive electrode plates 16 each having a thickness of the positive electrode current collector 19 of t are stacked one above the other, and the end edge portion 23 of the upper positive electrode plate 16 is connected to the end of the lower positive electrode plate 16. When it is displaced so as to project to the outside in the first direction X with respect to the edge portion 23, a force is applied to the protruding portion A that constitutes the end edge portion 23 of the upper positive electrode plate 16, and the protruding portion A is placed on the lower positive electrode plate. In order to bend along the contour of 16, the protruding length of the protruding portion A needs to be at least 3t (2t is required for the bending portion and t is required for the portion to which the force is applied). Then, as shown in FIG. 7, in order to allow the protruding portion A of the positive electrode plate 16 on the upper side to be flexed sufficiently, a margin of 3t, which is the minimum protruding length of the protruding portion A, is further added as a margin. In addition, it is preferable that the protruding length of the protruding portion A is 4t.
なお、複数の負極板１７を一枚置きに第２方向Ｙに負極集電体２１の厚さの４倍以上ずれるように積層することで、複数の負極板１７の第２方向Ｙにおける端縁部２４（ずれた部分）が第３方向Ｚに十分に撓みやすくなる理由については、上述の正極板１６の場合と同様であるため、説明を省略する。 In addition, by stacking a plurality of negative electrode plates 17 every other sheet so as to deviate in the second direction Y by at least four times the thickness of the negative electrode current collector 21, the edges of the plurality of negative electrode plates 17 in the second direction Y are stacked. The reason why the portion 24 (the shifted portion) is easily bent in the third direction Z is the same as in the case of the positive electrode plate 16 described above, and thus the description thereof is omitted.
次に、二次電池１１が製造過程で外力を受けるときの作用について説明する。
二次電池１１は、外装体１２内に電極積層体１３及び電解液を封止することによって形成される。その後、作業者は、外装体１２の外側から二次電池１１を手で揉むことにより、電極積層体１３における各負極板１７とセパレータ１８との間や各正極板１６とセパレータ１８との間に電解液を行き渡らせる。
Next, the operation when the secondary battery 11 receives an external force in the manufacturing process will be described.
The secondary battery 11 is formed by sealing the electrode laminate 13 and the electrolytic solution in the exterior body 12. After that, the operator manually rubs the secondary battery 11 from the outside of the outer casing 12 so that the negative electrode plate 17 and the separator 18 in the electrode laminated body 13 and the positive electrode plate 16 and the separator 18 in the electrode laminated body 13 are rubbed. Disperse the electrolyte.
このとき、図８に示すように、正極板１６における第１方向Ｘの端縁部２３及び負極板１７における第２方向Ｙの端縁部２４に、作業者による第３方向Ｚからの押圧力Ｆが付与されると、セパレータ１８における正極板１６の端縁部２３及び負極板１７の端縁部２４と対応する位置に対して集中的に剪断力がかかり易くなる。 At this time, as shown in FIG. 8, the pressing force from the third direction Z by the operator is applied to the end edge portion 23 of the positive electrode plate 16 in the first direction X and the end edge portion 24 of the negative electrode plate 17 in the second direction Y. When F is applied, the shearing force is likely to be intensively applied to the position corresponding to the edge 23 of the positive electrode plate 16 and the edge 24 of the negative electrode plate 17 in the separator 18.
この点、本実施形態の二次電池１１の電極積層体１３では、図８に示すように、複数の正極板１６が第１方向Ｘに一枚置きにずれるように積層されるとともに、複数の負極板１７が第２方向Ｙに一枚置きにずれるように積層されている。このため、電極積層体１３の端縁部、すなわち複数の正極板１６の第１方向Ｘの端縁部２３及び複数の負極板１７の第２方向Ｙの端縁部２４が撓み易くなっている。 In this regard, in the electrode stack 13 of the secondary battery 11 of the present embodiment, as shown in FIG. 8, a plurality of positive electrode plates 16 are stacked so as to be displaced in the first direction X every other sheet, and a plurality of positive plates 16 are stacked. The negative electrode plates 17 are laminated so as to be displaced in the second direction Y every other sheet. Therefore, the edge portions of the electrode stack 13, that is, the edge portions 23 of the plurality of positive electrode plates 16 in the first direction X and the edge portions 24 of the plurality of negative electrode plates 17 in the second direction Y are easily bent. ..
したがって、正極板１６における第１方向Ｘの端縁部２３及び負極板１７における第２方向Ｙの端縁部２４に対して作業者による第３方向Ｚからの押圧力Ｆが付与されても、図９に示すように、複数の正極板１６の第１方向Ｘの端縁部２３及び複数の負極板１７の第２方向Ｙの端縁部２４がセパレータ１８と一緒に第３方向Ｚに十分に撓む。 Therefore, even if the operator applies a pressing force F from the third direction Z to the edge portion 23 of the positive electrode plate 16 in the first direction X and the edge portion 24 of the negative electrode plate 17 in the second direction Y, As shown in FIG. 9, the edge portions 23 of the plurality of positive electrode plates 16 in the first direction X and the edge portions 24 of the plurality of negative electrode plates 17 in the second direction Y together with the separator 18 are sufficient in the third direction Z. Bend to.
この結果、正極板１６における第１方向Ｘの端縁部２３及び負極板１７における第２方向Ｙの端縁部２４と、作業者による第３方向Ｚからの押圧力Ｆの付与とによってセパレータ１８にかかる剪断力が効果的に低減されるので、当該剪断力によってセパレータ１８が破断することが抑制される。 As a result, the separator 18 is formed by the edge portion 23 of the positive electrode plate 16 in the first direction X, the edge portion 24 of the negative electrode plate 17 in the second direction Y, and the application of the pressing force F from the third direction Z by the operator. Since the shearing force applied to the separator 18 is effectively reduced, it is possible to prevent the separator 18 from breaking due to the shearing force.
因みに、図１０に示すように、複数の正極板１００の端縁１０１及び複数の負極板１０２の端縁１０３がそれぞれ揃うように積層された比較例の電極積層体１０４では、その端縁部１０５が切り立った絶壁形状となっている。このため、電極積層体１０４の端縁部１０５の剛性が高くなるので、当該端縁部１０５が撓み難い状態になる。この状態で、電極積層体１０４の端縁部１０５に対して作業者による第３方向Ｚからの押圧力Ｆが付与された場合には、図１１に示すように、正極板１００及び負極板１０２のそれぞれの端縁１０１，１０３が刃となってセパレータ１８に対して局所的に剪断力が集中して作用し、セパレータ１８が破断されるという問題がある。 Incidentally, as shown in FIG. 10, in the electrode laminated body 104 of the comparative example in which the edge 101 of the plurality of positive electrode plates 100 and the edge 103 of the plurality of negative electrode plates 102 are laminated so as to be aligned, the edge portion 105 is Has a steep cliff shape. For this reason, the rigidity of the edge portion 105 of the electrode laminate 104 is increased, and the edge portion 105 becomes difficult to bend. In this state, when the pressing force F from the third direction Z is applied to the edge portion 105 of the electrode stack 104 by the worker, as shown in FIG. 11, the positive electrode plate 100 and the negative electrode plate 102 are provided. There is a problem in that the respective edges 101 and 103 of the above become blades and the shearing force locally acts on the separator 18 to break the separator 18.
以上詳述した実施形態によれば、次のような効果が発揮される。
（１）二次電池１１において、複数の正極板１６及び複数の負極板１７は、一部の位置が第３方向Ｚ（積層方向）と交差する方向にずれるようにそれぞれ積層されている。この構成によれば、電極積層体１３の端縁部における正極板１６の積層枚数及び負極板１７の積層枚数が減少するので、電極積層体１３の端縁部を撓み易くすることができる。このため、電極積層体１３の端縁部に対して第３方向Ｚにおける押圧力Ｆが付与された場合には、正極板１６及び負極板１７のそれぞれの端縁部２３，２４がセパレータ１８と一緒に十分に撓むので、セパレータ１８が破断され難くなる。したがって、外力の作用によってセパレータ１８が破断することを抑制できる。
According to the embodiment described in detail above, the following effects are exhibited.
(1) In the secondary battery 11, the plurality of positive electrode plates 16 and the plurality of negative electrode plates 17 are stacked such that some positions are displaced in a direction intersecting the third direction Z (stacking direction). According to this configuration, the number of positive electrode plates 16 and the number of negative electrode plates 17 stacked at the edge of the electrode laminate 13 are reduced, so that the edge of the electrode laminate 13 can be easily bent. For this reason, when the pressing force F in the third direction Z is applied to the edge portions of the electrode laminate 13, the edge portions 23 and 24 of the positive electrode plate 16 and the negative electrode plate 17 respectively serve as the separator 18. Since it flexes sufficiently together, the separator 18 is less likely to be broken. Therefore, it is possible to prevent the separator 18 from breaking due to the action of the external force.
（２）二次電池１１において、複数の負極板１７は、一部の位置が負極タブ部２２の突出方向Ｙ２（第２方向Ｙに平行な方向であって正極タブ部２０の突出方向Ｙ１とは反対の方向）にずれるように積層されている。この構成によれば、複数の負極板１７における正極板１６側の端縁部２４に対して第３方向Ｚ（積層方向）の押圧力Ｆが付与された場合には、複数の負極板１７における正極板１６側の端縁部２４がセパレータ１８と一緒に十分に撓むので、複数の負極板１７における正極板１６側の端縁部２４においてセパレータ１８が破断することを抑制できる。したがって、負極板１７が正極板１６と接触して短絡することを効果的に抑制できる。 (2) In the secondary battery 11, a part of the plurality of negative electrode plates 17 has a protruding direction Y2 of the negative electrode tab portion 22 (a direction parallel to the second direction Y and a protruding direction Y1 of the positive electrode tab portion 20). Are laminated so that they are displaced in the opposite direction). According to this configuration, when the pressing force F in the third direction Z (the stacking direction) is applied to the edge portions 24 of the plurality of negative electrode plates 17 on the positive electrode plate 16 side, the plurality of negative electrode plates 17 will be affected. Since the edge portion 24 on the positive electrode plate 16 side is sufficiently bent together with the separator 18, it is possible to prevent the separator 18 from breaking at the edge portions 24 on the positive electrode plate 16 side of the plurality of negative electrode plates 17. Therefore, it is possible to effectively prevent the negative electrode plate 17 from coming into contact with the positive electrode plate 16 and causing a short circuit.
（３）二次電池１１において、複数の正極板１６は、一部の位置が正極タブ部２０の突出方向Ｙ１（第２方向Ｙに平行な方向）と直交する方向（第１方向Ｘ）にずれるように積層されている。この構成によれば、複数の正極板１６における負極板１７の端縁部２４と交わる端縁部２３に対して第３方向Ｚ（積層方向）の押圧力Ｆが付与された場合には、複数の正極板１６における負極板１７の端縁部２４と交わる端縁部２３がセパレータ１８と一緒に十分に撓む。このため、複数の正極板１６における負極板１７の端縁部２４と交わる端縁部２３においてセパレータ１８が破断することを抑制できる。したがって、正極板１６が負極板１７と接触して短絡することを効果的に抑制できる。 (3) In the secondary battery 11, a part of the plurality of positive electrode plates 16 is arranged in a direction (first direction X) orthogonal to the protruding direction Y1 of the positive electrode tab portion 20 (direction parallel to the second direction Y). They are stacked so that they are offset. According to this configuration, when the pressing force F in the third direction Z (stacking direction) is applied to the edge portion 23 of the plurality of positive electrode plates 16 that intersects the edge portion 24 of the negative electrode plate 17, a plurality of The edge portion 23 of the positive electrode plate 16 that intersects the edge portion 24 of the negative electrode plate 17 is sufficiently bent together with the separator 18. Therefore, it is possible to prevent the separator 18 from breaking at the edge portion 23 of the plurality of positive electrode plates 16 that intersects the edge portion 24 of the negative electrode plate 17. Therefore, it is possible to effectively prevent the positive electrode plate 16 from coming into contact with the negative electrode plate 17 and causing a short circuit.
（４）二次電池１１において、負極板１７をずらす量は、負極集電体２１の厚さの４倍以上である。この構成によれば、ずらされた負極板１７の端縁部２４を十分に撓み易くすることができる。 (4) In the secondary battery 11, the amount of displacement of the negative electrode plate 17 is four times or more the thickness of the negative electrode current collector 21. According to this configuration, the edge portion 24 of the shifted negative electrode plate 17 can be sufficiently easily bent.
（５）二次電池１１において、正極板１６をずらす量は、正極集電体１９の厚さの４倍以上である。この構成によれば、ずらされた正極板１６の端縁部２３を十分に撓み易くすることができる。 (5) In the secondary battery 11, the amount by which the positive electrode plate 16 is displaced is four times or more the thickness of the positive electrode current collector 19. According to this structure, the displaced edge portion 23 of the positive electrode plate 16 can be sufficiently easily bent.
（変更例）
なお、上記実施形態は次のように変更してもよい。
・二次電池１１において、正極板１６をずらす量は、必ずしも正極集電体１９の厚さの４倍以上である必要はない。
(Example of change)
The above embodiment may be modified as follows.
In the secondary battery 11, the amount of displacement of the positive electrode plate 16 does not necessarily have to be four times or more the thickness of the positive electrode current collector 19.
・二次電池１１において、負極板１７をずらす量は、必ずしも負極集電体２１の厚さの４倍以上である必要はない。
・二次電池１１において、複数の正極板１６は、必ずしも一部の位置が正極タブ部２０の突出方向Ｙ１と直交する第１方向Ｘにずれるように積層する必要はない。すなわち、複数の正極板１６は、例えば、一部の位置が第２方向Ｙにずれるように積層してもよい。
In the secondary battery 11, the amount of displacement of the negative electrode plate 17 does not necessarily have to be four times or more the thickness of the negative electrode current collector 21.
In the secondary battery 11, the plurality of positive electrode plates 16 do not necessarily need to be stacked such that some positions are displaced in the first direction X orthogonal to the protruding direction Y1 of the positive electrode tab portion 20. That is, the plurality of positive electrode plates 16 may be stacked so that, for example, some positions are displaced in the second direction Y.
・二次電池１１において、複数の正極板１６は、端縁部２３が揃うように積層してもよい。
・二次電池１１において、複数の負極板１７は、必ずしも一部の位置が負極タブ部２２の突出方向Ｙ２（第２方向Ｙに平行な方向）にずれるように積層する必要はない。すなわち、複数の負極板１７は、例えば、一部の位置が第１方向Ｘにずれるように積層してもよい。
In the secondary battery 11, the plurality of positive electrode plates 16 may be stacked so that the edge portions 23 are aligned.
In the secondary battery 11, the plurality of negative electrode plates 17 do not necessarily have to be stacked so that some positions are displaced in the protruding direction Y2 of the negative electrode tab portion 22 (direction parallel to the second direction Y). That is, the plurality of negative electrode plates 17 may be stacked so that, for example, some positions are displaced in the first direction X.
・二次電池１１において、複数の負極板１７は、端縁部２４が揃うように積層してもよい。
・二次電池１１において、複数の正極板１６及び複数の負極板１７は、それぞれ二枚置きや三枚置きなどの複数枚置きに位置がずれるように積層してもよい。例えば、複数の正極板１６及び複数の負極板１７は、それぞれ一部を一枚置きに位置がずれるように積層し、一部を二枚置きに位置がずれるように積層し、一部を四枚置きに位置がずれるように積層するなどのように、位置をずらす規則性が２つ以上あってもよい。すなわち、複数の正極板１６及び複数の負極板１７は、それぞれ、互いに異なる複数の任意な枚数置きに位置がずれるように積層してもよい。この場合、位置をずらして積層される正極板１６及び負極板１７のずらす量は、必ずしも一定である必要はない。
In the secondary battery 11, the plurality of negative electrode plates 17 may be laminated so that the edge portions 24 are aligned.
-In the secondary battery 11, the plurality of positive electrode plates 16 and the plurality of negative electrode plates 17 may be laminated so that the positions thereof are shifted to each other such as every two or three. For example, the plurality of positive electrode plates 16 and the plurality of negative electrode plates 17 are partly stacked such that every other plate is displaced and every other part is laminated so that each part is displaced from each other. There may be two or more regularities for shifting the positions, such as stacking sheets so that the positions are displaced. That is, the plurality of positive electrode plates 16 and the plurality of negative electrode plates 17 may be laminated such that their positions are displaced at a plurality of arbitrary number of different sheets. In this case, the displacement amounts of the positive electrode plate 16 and the negative electrode plate 17, which are stacked by shifting the positions, do not necessarily have to be constant.
・二次電池１１において、複数の正極板１６及び複数の負極板１７は、それぞれ平行移動によって位置をずらすように積層するだけでなく、回転移動によって位置をずらすように積層してもよい。 -In the secondary battery 11, the plurality of positive electrode plates 16 and the plurality of negative electrode plates 17 may be stacked not only to be displaced by parallel movement but also to be displaced so as to be displaced by rotational movement.
・二次電池１１において、位置をずらして積層される正極板１６及び負極板１７は、それぞれ平行移動によって位置をずらすものと回転移動によって位置をずらすものとが混在していてもよい。 In the secondary battery 11, the positive electrode plate 16 and the negative electrode plate 17, which are stacked by shifting the positions, may be a mixture of those that are displaced in position by parallel movement and those that are displaced by rotational movement.
・二次電池１１において、セパレータ１８は、例えば絶縁性を有する合成樹脂製の多孔質シートによって構成してもよい。 -In the secondary battery 11, the separator 18 may be formed of, for example, a porous sheet made of synthetic resin having an insulating property.
１１…二次電池、１３…電極積層体、１６…正極板、１７…負極板、１８…セパレータ、１９…正極集電体、２０…正極タブ部、２１…負極集電体、２２…負極タブ部。Ｙ１，Ｙ２…突出方向、Ｚ…第３方向Ｚ（積層方向）。 DESCRIPTION OF SYMBOLS 11... Secondary battery, 13... Electrode laminated body, 16... Positive electrode plate, 17... Negative electrode plate, 18... Separator, 19... Positive electrode collector, 20... Positive electrode tab part, 21... Negative electrode collector, 22... Negative electrode tab Department. Y1, Y2... Protrusion direction, Z... Third direction Z (stacking direction).
Claims (5)
複数の前記正極板及び複数の前記負極板のうちの少なくとも一方は、一部の位置が積層方向と交差する方向にずれるように積層されていることを特徴とする二次電池。 A secondary battery comprising a positive electrode plate having a positive electrode current collector, and a negative electrode plate having a negative electrode current collector and a plurality of electrode laminates alternately laminated via a separator,
A secondary battery, wherein at least one of the plurality of positive electrode plates and the plurality of negative electrode plates is stacked such that some positions are displaced in a direction intersecting the stacking direction.
複数の前記負極板は、一部の位置が前記負極タブ部の突出方向にずれるように積層されていることを特徴とする請求項１に記載の二次電池。 The negative electrode current collector has a negative electrode tab portion protruding from an end thereof,
The secondary battery according to claim 1, wherein a plurality of the negative electrode plates are stacked such that a part of the negative electrode plates is displaced in a protruding direction of the negative electrode tab portion.
複数の前記正極板は、一部の位置が前記正極タブ部の突出方向と直交する方向にずれるように積層されていることを特徴とする請求項１または請求項２に記載の二次電池。 The positive electrode current collector has a positive electrode tab portion protruding from an end thereof,
The secondary battery according to claim 1 or 2, wherein a plurality of the positive electrode plates are stacked such that a part of the positive electrode plates is displaced in a direction orthogonal to a protruding direction of the positive electrode tab portion.
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| JP2009129917A (en) * | 2007-11-19 | 2009-06-11 | Fdk Corp | Power storage device |
| JP2012054003A (en) * | 2010-08-31 | 2012-03-15 | Furukawa Battery Co Ltd:The | Lithium ion battery |
| JP2013518394A (en) * | 2010-01-26 | 2013-05-20 | シンベット・コーポレイション | Battery array, structure and method |
| WO2014050988A1 (en) * | 2012-09-27 | 2014-04-03 | Ｎｅｃエナジーデバイス株式会社 | Lithium ion secondary battery and method for manufacturing same |
| JP2014524131A (en) * | 2012-05-25 | 2014-09-18 | エルジー・ケム・リミテッド | Electrode assembly having step, battery cell, battery pack and device including the same |
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| JP2009129917A (en) * | 2007-11-19 | 2009-06-11 | Fdk Corp | Power storage device |
| JP2013518394A (en) * | 2010-01-26 | 2013-05-20 | シンベット・コーポレイション | Battery array, structure and method |
| JP2012054003A (en) * | 2010-08-31 | 2012-03-15 | Furukawa Battery Co Ltd:The | Lithium ion battery |
| JP2014524131A (en) * | 2012-05-25 | 2014-09-18 | エルジー・ケム・リミテッド | Electrode assembly having step, battery cell, battery pack and device including the same |
| WO2014050988A1 (en) * | 2012-09-27 | 2014-04-03 | Ｎｅｃエナジーデバイス株式会社 | Lithium ion secondary battery and method for manufacturing same |
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