JP6417760B2 - Power storage device - Google Patents
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- JP6417760B2 JP6417760B2 JP2014143470A JP2014143470A JP6417760B2 JP 6417760 B2 JP6417760 B2 JP 6417760B2 JP 2014143470 A JP2014143470 A JP 2014143470A JP 2014143470 A JP2014143470 A JP 2014143470A JP 6417760 B2 JP6417760 B2 JP 6417760B2
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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
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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
- 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
Description
本発明は、正極電極、負極電極及びセパレータを積層した電極組立体を有する蓄電装置に関する。 The present invention relates to a power storage device having an electrode assembly in which a positive electrode, a negative electrode, and a separator are stacked.
ＥＶ（Electric Vehicle）やＰＨＶ（Plug in Hybrid Vehicle）などの車両には、走行用モータへの供給電力を蓄える蓄電装置としての二次電池が搭載されている。二次電池としては、電極組立体がケース内に収容されているものがある。また、電極組立体は、シート状の正極電極と負極電極を、両者の間をセパレータで絶縁した状態で積層して構成されている。正極電極は、正極金属箔の両面に正極活物質層を有し、負極電極は、負極金属箔の両面に負極活物質層を有する。 Vehicles such as EVs (Electric Vehicles) and PHVs (Plug in Hybrid Vehicles) are equipped with secondary batteries as power storage devices that store the power supplied to the driving motor. Some secondary batteries include an electrode assembly housed in a case. In addition, the electrode assembly is configured by laminating a sheet-like positive electrode and a negative electrode in a state in which they are insulated by a separator. The positive electrode has a positive electrode active material layer on both sides of the positive electrode metal foil, and the negative electrode has a negative electrode active material layer on both sides of the negative electrode metal foil.
また、ケース内では、正極電極の一辺の一部から突出する正極タブに、正極の電極端子が導電部材を介して電気的に接続されるとともに、負極電極の一辺の一部から突出する負極タブに、負極の電極端子が導電部材を介して電気的に接続されている。これら正極及び負極の電極端子は、一部がケースの壁部を貫通してケースの外へ突出している。 Further, in the case, the positive electrode terminal is electrically connected to the positive electrode tab protruding from a part of one side of the positive electrode via a conductive member, and the negative electrode tab protruding from a part of one side of the negative electrode In addition, the negative electrode terminal is electrically connected via a conductive member. Some of these positive electrode terminals and negative electrode terminals protrude through the wall portion of the case to the outside of the case.
リチウムイオン電池のような二次電池では、充電時の電流の集中によって負極活物質層の表面への金属リチウムの析出を抑制するために、正極活物質層の面積に比べて負極活物質層の面積を大きくして、正極活物質層の全面にセパレータを介して負極活物質層を対向させている。このため、負極電極の平面視でのサイズは、正極電極の平面視でのサイズよりも一回り大きくなっている。 In a secondary battery such as a lithium ion battery, in order to suppress the deposition of metallic lithium on the surface of the negative electrode active material layer due to current concentration during charging, the negative electrode active material layer has a larger area than the positive electrode active material layer. The area is increased, and the negative electrode active material layer is opposed to the entire surface of the positive electrode active material layer through a separator. For this reason, the size of the negative electrode in plan view is slightly larger than the size of the positive electrode in plan view.
よって、電極組立体の積層方向において、正極タブの根本には負極電極が対向することになる。この正極タブの根本と負極電極との短絡を抑制するために、セパレータは正極タブの根本と負極電極との間に介在している。さらに、正極タブが倒れたり、積層ずれが生じたときでも、正極タブと負極電極の短絡を抑制できるように、セパレータは、負極電極の一辺よりもはみ出るように、平面視でのサイズが負極電極よりも大きくなっている。 Therefore, in the stacking direction of the electrode assembly, the negative electrode faces the base of the positive electrode tab. In order to suppress a short circuit between the base of the positive electrode tab and the negative electrode, the separator is interposed between the base of the positive electrode tab and the negative electrode. Furthermore, the size of the separator in the plan view is such that the separator protrudes beyond one side of the negative electrode so that the short-circuit between the positive electrode tab and the negative electrode can be suppressed even when the positive electrode tab falls or misalignment occurs. Is bigger than.
さらには、正極タブと負極電極の短絡を抑制するため、セパレータの一辺の一部を突出させて正極タブの根本を覆う保護部を形成したもの、又は、負極電極において、正極タブの根本に対する対向部に切除部を形成したものがある（例えば、特許文献１参照）。 Furthermore, in order to suppress short circuit between the positive electrode tab and the negative electrode, a part of one side of the separator is protruded to form a protective part that covers the base of the positive electrode tab, or in the negative electrode, facing the base of the positive electrode tab There is one in which a cut portion is formed in the portion (see, for example, Patent Document 1).
ところが、セパレータの保護部、又は負極電極の切除部においては、その製造誤差や、積層ずれ等を原因として、正極タブと負極電極が短絡してしまう虞がある。
本発明は、このような従来技術の問題点に鑑みてなされたものであり、その目的は、正極タブと負極電極との短絡を抑制することができる蓄電装置を提供することにある。
However, in the protection part of the separator or the excision part of the negative electrode, there is a possibility that the positive electrode tab and the negative electrode are short-circuited due to manufacturing error, stacking error, or the like.
The present invention has been made in view of such problems of the prior art, and an object thereof is to provide a power storage device that can suppress a short circuit between a positive electrode tab and a negative electrode.
上記問題点を解決するための蓄電装置は、一辺の一部から突出する正極タブを有する正極電極と、前記正極電極よりも平面視でのサイズが一回り大きく、一辺の一部から突出する負極タブを有する負極電極と、前記正極電極と前記負極電極の間を絶縁するセパレータと、前記正極電極、前記負極電極及び前記セパレータを積層した電極組立体と、を有する蓄電装置であって、前記セパレータは、該セパレータの一辺の一部から突出し、かつ前記正極タブの根本を覆うタブ対向部を有し、前記負極電極は、前記電極組立体の積層方向において前記正極タブの根本と対峙する部分に、該負極電極の一辺の一部から凹む短絡抑制部を有することを要旨とする。 A power storage device for solving the above problems includes a positive electrode having a positive electrode tab projecting from a part of one side, and a negative electrode projecting from a part of one side that is one size larger in plan view than the positive electrode. A power storage device comprising: a negative electrode having a tab; a separator that insulates between the positive electrode and the negative electrode; and an electrode assembly in which the positive electrode, the negative electrode, and the separator are stacked. Has a tab facing portion that protrudes from a part of one side of the separator and covers the base of the positive electrode tab, and the negative electrode is located at a portion facing the base of the positive electrode tab in the stacking direction of the electrode assembly. The gist is to have a short-circuit suppressing portion that is recessed from a part of one side of the negative electrode.
これによれば、積層方向から電極組立体を見た場合、短絡抑制部が負極電極の一辺から凹んだ分だけ、負極電極において正極タブの根本に対峙する面積が減り、正極タブが倒れたりしても、負極電極に接触しにくくなる。さらに、セパレータにタブ対向部を突出させたため、セパレータにおいて、短絡抑制部の底縁からタブ対向部の突出端縁に至るまでの領域が正極タブの根本に対峙しており、短絡抑制部が無い場合と比べると、正極タブに対峙するセパレータの面積が広くなる。その結果として、短絡抑制部とタブ対向部を併用することで、正極タブと負極電極の短絡を抑制することができる。 According to this, when the electrode assembly is viewed from the stacking direction, the area of the negative electrode facing the base of the positive electrode tab is reduced by the amount that the short-circuit suppressing portion is recessed from one side of the negative electrode, and the positive electrode tab falls down. However, it becomes difficult to contact the negative electrode. In addition, since the tab facing portion protrudes from the separator, the region from the bottom edge of the short-circuit suppressing portion to the protruding edge of the tab facing portion faces the base of the positive electrode tab in the separator, and there is no short-circuit suppressing portion. Compared to the case, the area of the separator facing the positive electrode tab is increased. As a result, the short circuit between the positive electrode tab and the negative electrode can be suppressed by using the short circuit suppressing unit and the tab facing unit together.
また、蓄電装置について、前記セパレータは、互いに対峙する第１のセパレータ部材及び第２のセパレータ部材を熱溶着して形成されており、前記セパレータは、前記正極電極における正極タブを除いた部分を収納する収納部を有するとともに、前記収納部よりも第１のセパレータ部材及び第２のセパレータ部材の端縁側のはみ出し部において、前記正極タブの根本と対峙しない部分を熱溶着した溶着部を有している。 In the power storage device, the separator is formed by heat-welding the first separator member and the second separator member facing each other, and the separator accommodates a portion of the positive electrode excluding the positive electrode tab. And having a welded portion in which a portion not facing the base of the positive electrode tab is thermally welded at the protruding portion on the edge side of the first separator member and the second separator member from the housing portion. Yes.
これによれば、第１のセパレータ部材と第２のセパレータ部材を熱溶着する際、正極タブと対峙するはみ出し部には熱を加えず、その他のはみ出し部に熱を加える。すると、熱の加えられたはみ出し部が収縮する一方で、熱の加えられなかったはみ出し部は収縮せず、熱の加えられなかったはみ出し部が相対的に突出する。この突出した部分にタブ対向部が形成される。しかし、熱によって収縮させることのできる量には限りがあり、はみ出し部での収縮量が少なく、タブ対向部の相対的な突出量が少なくなる場合がある。このような場合でも、短絡抑制部の凹みを加えることによって、正極タブの根本に対峙するセパレータの面積を確保して、正極タブと負極電極の短絡を抑制することができる。 According to this, when heat-welding the first separator member and the second separator member, heat is not applied to the protruding portion facing the positive electrode tab, but heat is applied to the other protruding portions. Then, while the protrusion part to which heat was applied contracts, the protrusion part to which heat has not been applied does not contract, and the protrusion part to which heat has not been applied protrudes relatively. A tab facing portion is formed at the protruding portion. However, the amount that can be shrunk by heat is limited, the shrinkage amount at the protruding portion is small, and the relative protrusion amount of the tab facing portion may be small. Even in such a case, by adding a dent in the short-circuit suppressing portion, it is possible to secure the area of the separator facing the base of the positive electrode tab and to suppress a short circuit between the positive electrode tab and the negative electrode.
また、蓄電装置について、前記負極タブを除いた前記負極電極の平面視でのサイズは、前記セパレータの平面視でのサイズと同じであるとよい。
これによれば、タブ対向部と短絡抑制部を有することで、負極電極の平面視でのサイズが正極電極より一回り大きくても、正極タブと負極電極の短絡を抑制できる。このため、セパレータに関しては、タブ対向部さえ有していればセパレータの平面視でのサイズが、負極タブを除いた負極電極の平面視でのサイズと同じでもよくなり、タブ対向部を除いたセパレータの平面形状と、負極タブを除いた負極電極の平面形状を一致させることができる。この場合には、電極組立体を製造する際、セパレータと負極電極をランダムに積層した後、セパレータと負極電極の縁を揃えるだけで、積層ずれのない電極組立体を製造することができ、電極組立体の製造が楽になる。
In the power storage device, the size of the negative electrode excluding the negative electrode tab in plan view may be the same as the size of the separator in plan view.
According to this, by having the tab facing portion and the short-circuit suppressing portion, it is possible to suppress a short-circuit between the positive electrode tab and the negative electrode even if the size of the negative electrode in plan view is one size larger than that of the positive electrode. For this reason, as long as the separator has a tab facing portion, the size of the separator in plan view may be the same as the size of the negative electrode in plan view excluding the negative electrode tab, and the tab facing portion is excluded. The planar shape of the separator and the planar shape of the negative electrode excluding the negative electrode tab can be matched. In this case, when the electrode assembly is manufactured, after the separator and the negative electrode are randomly stacked, the electrode assembly without stacking deviation can be manufactured simply by aligning the edges of the separator and the negative electrode. The assembly is easier to manufacture.
前記蓄電装置は二次電池である。 The power storage device is a secondary battery.
本発明によれば、正極タブと負極電極との短絡を抑制することができる。 According to the present invention, a short circuit between the positive electrode tab and the negative electrode can be suppressed.
以下、蓄電装置を二次電池に具体化した一実施形態を図１〜図４にしたがって説明する。
図１及び図２に示すように、二次電池１０は、外郭を構成する金属製のケース１１を備えている。ケース１１は、一面に開口部１２ａを備える有底直方体状のケース本体１２と、開口部１２ａを塞ぐ蓋体１３とを備えている。ケース１１には、電極組立体１４及び電解質としての電解液（図示略）が収容されている。二次電池１０はリチウムイオン電池である。
Hereinafter, an embodiment in which the power storage device is embodied as a secondary battery will be described with reference to FIGS.
As shown in FIGS. 1 and 2, the secondary battery 10 includes a metal case 11 constituting an outer shell. The case 11 includes a bottomed rectangular parallelepiped case main body 12 having an opening 12a on one surface, and a lid 13 that closes the opening 12a. The case 11 contains an electrode assembly 14 and an electrolytic solution (not shown) as an electrolyte. The secondary battery 10 is a lithium ion battery.
図３に示すように、電極組立体１４は、複数の正極電極２１と、複数の負極電極２４とが、両者の間に樹脂製のセパレータ２７が介在する状態で交互に積層された積層型の構成である。正極電極２１は、矩形状の正極金属箔（本実施形態ではアルミニウム箔）２２と、その正極金属箔２２の両面に設けられた矩形状の正極活物質層２３と、を有する。正極金属箔２２の両面の正極活物質層２３は、同じ平面形状及び同じ厚みであり、かつ正極金属箔２２を挟んで互いに対向している。正極電極２１は、その第１の辺２２ｃに沿って、正極活物質層２３が設けられず、正極金属箔２２が露出した正極未塗工部２２ｄを有する。 As shown in FIG. 3, the electrode assembly 14 includes a plurality of positive electrodes 21 and a plurality of negative electrodes 24 that are alternately stacked with a resin separator 27 interposed therebetween. It is a configuration. The positive electrode 21 includes a rectangular positive metal foil (aluminum foil in this embodiment) 22 and a rectangular positive electrode active material layer 23 provided on both surfaces of the positive metal foil 22. The positive electrode active material layers 23 on both surfaces of the positive electrode metal foil 22 have the same planar shape and the same thickness, and face each other with the positive electrode metal foil 22 in between. The positive electrode 21 has a positive electrode uncoated portion 22d in which the positive electrode active material layer 23 is not provided and the positive electrode metal foil 22 is exposed along the first side 22c.
そして、正極電極２１において、正極未塗工部２２ｄの長辺（一辺）となる第１の辺２２ｃの一部には、正極タブ３１が突出する状態に設けられている。なお、正極タブ３１は、正極未塗工部２２ｄの第１の辺２２ｃからの突出方向に沿って一定幅で延びている。正極電極２１において、正極タブ３１が設けられた第１の辺２２ｃの対辺となる長辺を第２の辺２２ｅとし、第１の辺２２ｃと第２の辺２２ｅを繋ぐ一対の短辺を第３の辺２２ｆとする。 And in the positive electrode 21, the positive electrode tab 31 protrudes in a part of 1st edge | side 22c used as the long side (one side) of the positive electrode uncoated part 22d. The positive electrode tab 31 extends with a constant width along the protruding direction from the first side 22c of the positive electrode uncoated portion 22d. In the positive electrode 21, the long side that is the opposite side of the first side 22c provided with the positive electrode tab 31 is the second side 22e, and the pair of short sides that connect the first side 22c and the second side 22e is the first side. 3 side 22f.
負極電極２４は、矩形状の負極金属箔（本実施形態では銅箔）２５と、その負極金属箔２５の両面に設けられた矩形状の負極活物質層２６と、を有する。負極金属箔２５の両面の負極活物質層２６は、同じ平面形状及び同じ厚みである。負極電極２４は、その第１の辺２５ｃに沿って、負極活物質層２６が設けられず、負極金属箔２５が露出した負極未塗工部２５ｄを有する。 The negative electrode 24 includes a rectangular negative metal foil (copper foil in this embodiment) 25 and a rectangular negative electrode active material layer 26 provided on both surfaces of the negative metal foil 25. The negative electrode active material layers 26 on both sides of the negative electrode metal foil 25 have the same planar shape and the same thickness. The negative electrode 24 has a negative electrode uncoated portion 25d in which the negative electrode active material layer 26 is not provided and the negative electrode metal foil 25 is exposed along the first side 25c.
そして、負極電極２４において、負極未塗工部２５ｄの長辺（一辺）となる第１の辺２５ｃの一部には、負極タブ３２が突出する状態に設けられている。なお、負極タブ３２は、負極未塗工部２５ｄの第１の辺２５ｃからの突出方向に沿って一定幅で延びている。負極電極２４において、負極タブ３２が設けられた第１の辺２５ｃの対辺となる長辺を第２の辺２５ｅとし、第１の辺２５ｃと第２の辺２５ｅを繋ぐ一対の短辺を第３の辺２５ｆとする。 And in the negative electrode 24, the negative electrode tab 32 protrudes in a part of 1st edge | side 25c used as the long side (one side) of the negative electrode uncoated part 25d. The negative electrode tab 32 extends with a constant width along the protruding direction from the first side 25c of the negative electrode uncoated portion 25d. In the negative electrode 24, the long side that is the opposite side of the first side 25c provided with the negative electrode tab 32 is the second side 25e, and the pair of short sides that connect the first side 25c and the second side 25e is the first side. 3 side 25f.
正極電極２１は、袋状のセパレータ２７に包まれている。セパレータ２７において、正極電極２１の第１の辺２２ｃに沿って延びる長辺を、セパレータ２７の一辺としての第１の辺２７ｃとし、第１の辺２７ｃの対辺で、かつ正極電極２１の第２の辺２２ｅに沿って延びる長辺を第２の辺２７ｅとする。また、セパレータ２７において、第１の辺２７ｃと第２の辺２７ｅを繋ぎ、かつ正極電極２１の第３の辺２２ｆに沿って延びる一対の短辺を第３の辺２７ｆとする。 The positive electrode 21 is wrapped in a bag-like separator 27. In the separator 27, the long side extending along the first side 22 c of the positive electrode 21 is a first side 27 c as one side of the separator 27, the opposite side of the first side 27 c and the second side of the positive electrode 21. The long side extending along the side 22e is defined as a second side 27e. In the separator 27, a pair of short sides that connect the first side 27c and the second side 27e and extend along the third side 22f of the positive electrode 21 are defined as a third side 27f.
図１に示すように、正極電極２１と、負極電極２４と、セパレータ２７は、正極タブ３１が積層方向に沿って列状に配置され、且つ正極タブ３１と重ならない位置にて負極タブ３２が積層方向に沿って列状に配置されるように積層される。そして、電極組立体１４は、負極金属箔２５の第１の辺２５ｃ及びセパレータ２７の第１の辺２７ｃが寄せ集められて形成されたタブ側端面３６を備え、このタブ側端面３６では、正極タブ３１及び負極タブ３２は、電極組立体１４における積層方向の一端から他端までの範囲内で集められた（束ねられた）状態で折り曲げられている。正極タブ３１が重なっている箇所を溶接することによって正極タブ３１が電気的に接続されるとともに、正極タブ３１には正極導電部材４１ａが接続されている。 As shown in FIG. 1, the positive electrode 21, the negative electrode 24, and the separator 27 are arranged such that the positive electrode tabs 31 are arranged in a row along the stacking direction and the negative electrode tabs 32 are not overlapped with the positive electrode tabs 31. They are stacked so as to be arranged in a row along the stacking direction. The electrode assembly 14 includes a tab side end surface 36 formed by gathering together the first side 25c of the negative electrode metal foil 25 and the first side 27c of the separator 27. The tab 31 and the negative electrode tab 32 are bent in a state of being collected (bundled) within a range from one end to the other end in the stacking direction of the electrode assembly 14. The positive electrode tab 31 is electrically connected by welding a portion where the positive electrode tab 31 overlaps, and the positive electrode conductive member 41 a is connected to the positive electrode tab 31.
正極導電部材４１ａは、一枚の金属板、例えばアルミニウム板を屈曲させたものであり、クランク形状である。正極導電部材４１ａは、湾曲部分に対して長手方向一方側に正極タブ側溶接片４１ｂを有し、この正極タブ側溶接片４１ｂに、積層方向一端の正極タブ３１が溶接によって接合されている。また、正極導電部材４１ａは、湾曲部分に対して長手方向他方側に端子側溶接片４１ｃを有し、この端子側溶接片４１ｃに正極端子４３が溶接されている。 The positive electrode conductive member 41a is formed by bending a single metal plate, such as an aluminum plate, and has a crank shape. The positive electrode conductive member 41a has a positive electrode tab side weld piece 41b on one side in the longitudinal direction with respect to the curved portion, and the positive electrode tab 31 at one end in the stacking direction is joined to the positive electrode tab side weld piece 41b by welding. Further, the positive electrode conductive member 41a has a terminal-side weld piece 41c on the other side in the longitudinal direction with respect to the curved portion, and the positive electrode terminal 43 is welded to the terminal-side weld piece 41c.
端子側溶接片４１ｃに溶接された正極端子４３は、板状の基部４３ａと、基部４３ａから突出した極柱部４３ｂとを備える。正極端子４３は、蓋体１３に固定されるとともに、極柱部４３ｂは蓋体１３を貫通してケース１１の外側に突出している。正極端子４３は絶縁リング１３ｂによって蓋体１３から絶縁されている。また、端子側溶接片４１ｃは、タブ側端面３６での各第１の辺２２ｃ，２５ｃ，２７ｃの延びる方向に沿って、正極タブ３１と並んで配置されている。 The positive terminal 43 welded to the terminal-side weld piece 41c includes a plate-like base portion 43a and a pole post portion 43b protruding from the base portion 43a. The positive electrode terminal 43 is fixed to the lid body 13, and the pole column portion 43 b protrudes outside the case 11 through the lid body 13. The positive terminal 43 is insulated from the lid 13 by an insulating ring 13b. The terminal-side weld piece 41c is arranged alongside the positive electrode tab 31 along the extending direction of the first sides 22c, 25c, 27c on the tab-side end surface 36.
同様に、各負極タブ３２が重なっている箇所を溶接することによって各負極タブ３２が電気的に接続されるとともに、負極タブ３２には、電極組立体１４から電気を取り出すための負極導電部材４２ａが接続されている。負極導電部材４２ａは、一枚の金属板、例えば銅板を屈曲させたものであり、クランク形状である。負極導電部材４２ａは、湾曲部分に対して長手方向一方側に負極タブ側溶接片４２ｂを有し、この負極タブ側溶接片４２ｂに、積層方向一端の負極タブ３２が溶接によって接合されている。 Similarly, the negative electrode tabs 32 are electrically connected by welding the portions where the negative electrode tabs 32 overlap each other, and the negative electrode tab 32 has a negative electrode conductive member 42 a for taking out electricity from the electrode assembly 14. Is connected. The negative electrode conductive member 42a is formed by bending a single metal plate, such as a copper plate, and has a crank shape. The negative electrode conductive member 42a has a negative electrode tab side weld piece 42b on one side in the longitudinal direction with respect to the curved portion, and the negative electrode tab 32 at one end in the stacking direction is joined to the negative electrode tab side weld piece 42b by welding.
また、負極導電部材４２ａは、湾曲部分に対して長手方向他方側に端子側溶接片４２ｃを有し、この端子側溶接片４２ｃに負極端子４６が溶接されている。端子側溶接片４２ｃに溶接された負極端子４６は、板状の基部４６ａと、基部４６ａから突出した極柱部４６ｂとを備える。負極端子４６は、蓋体１３に固定されるとともに、極柱部４６ｂは蓋体１３を貫通してケース１１の外側に突出している。負極端子４６は絶縁リング１３ｂによって蓋体１３から絶縁されている。端子側溶接片４２ｃは、タブ側端面３６での各第１の辺２２ｃ，２５ｃ，２７ｃの延びる方向に沿って、負極タブ３２と並んで配置されている。 The negative electrode conductive member 42a has a terminal-side weld piece 42c on the other side in the longitudinal direction with respect to the curved portion, and the negative electrode terminal 46 is welded to the terminal-side weld piece 42c. The negative electrode terminal 46 welded to the terminal-side weld piece 42c includes a plate-like base portion 46a and a pole column portion 46b protruding from the base portion 46a. The negative electrode terminal 46 is fixed to the lid body 13, and the pole column portion 46 b protrudes outside the case 11 through the lid body 13. The negative terminal 46 is insulated from the lid 13 by the insulating ring 13b. The terminal-side weld piece 42c is arranged side by side with the negative electrode tab 32 along the extending direction of the first sides 22c, 25c, 27c on the tab-side end surface 36.
ここで、図３に示すように、正極電極２１及び負極電極２４において、負極活物質層２６の隣り合う２辺の各辺の長さ（長手方向の長さ及び短手方向の長さ）は、正極活物質層２３の隣り合う２辺の各辺の長さ（長手方向の長さ及び短手方向の長さ）よりも長く設定されている。つまり、負極活物質層２６は、正極活物質層２３の全面を覆うことが可能な大きさに設定されている。また、負極電極２４の第１の辺２５ｃ及び第２の辺２５ｅの長さは、正極電極２１の第１の辺２２ｃと第２の辺２２ｅの長さより長く設定されている。さらに、負極電極２４の第３の辺２５ｆの長さは、正極電極２１の第３の辺２２ｆの長さより長く設定されている。つまり、負極電極２４の平面視でのサイズは、正極電極２１の平面視でのサイズより一回り大きい。 Here, as shown in FIG. 3, in the positive electrode 21 and the negative electrode 24, the lengths of the two adjacent sides of the negative electrode active material layer 26 (the length in the longitudinal direction and the length in the short direction) are as follows. The lengths of the two adjacent sides of the positive electrode active material layer 23 (the length in the longitudinal direction and the length in the short direction) are set longer. That is, the negative electrode active material layer 26 is set to a size that can cover the entire surface of the positive electrode active material layer 23. The lengths of the first side 25c and the second side 25e of the negative electrode 24 are set longer than the lengths of the first side 22c and the second side 22e of the positive electrode 21. Further, the length of the third side 25 f of the negative electrode 24 is set to be longer than the length of the third side 22 f of the positive electrode 21. That is, the size of the negative electrode 24 in plan view is slightly larger than the size of the positive electrode 21 in plan view.
このように形成された正極電極２１と負極電極２４は、二次電池１０におけるエネルギー密度の低下を抑える観点から、正極活物質層２３と負極活物質層２６がセパレータ２７を介して全面が対向するように積層されている。このように精度良く製造された電極組立体１４に、積層方向や、各活物質層２３，２６の面に沿う方向へのずれが生じないようにするために、電極組立体１４は保持テープ４５で保持されている。 The positive electrode 21 and the negative electrode 24 thus formed are opposed to each other across the entire surface of the positive electrode active material layer 23 and the negative electrode active material layer 26 with a separator 27 in view of suppressing a decrease in energy density in the secondary battery 10. Are stacked. In order to prevent the electrode assembly 14 thus manufactured with high precision from being displaced in the stacking direction or in the direction along the surfaces of the active material layers 23 and 26, the electrode assembly 14 is provided with a holding tape 45. Is held by.
次に、セパレータ２７について詳細に説明する。
図３に示すように、セパレータ２７は、第１のセパレータ部材２８と第２のセパレータ部材２９を熱溶着して袋状に形成されている。第１のセパレータ部材２８と第２のセパレータ部材２９は、互いに対峙している。また、第１のセパレータ部材２８と第２のセパレータ部材２９は、正極電極２１の両面を覆う大きさで、かつ同一の大きさの四角形状である。セパレータ２７は、第１のセパレータ部材２８と第２のセパレータ部材２９で形成された収納部２７ａを有し、この収納部２７ａに正極電極２１が収納されている。第１のセパレータ部材２８及び第２のセパレータ部材２９は、重ねた状態において、正極電極２１の第１の辺２２ｃ、第２の辺２２ｅ及び第３の辺２２ｆからはみ出すはみ出し部３０を備える。そして、セパレータ２７は、正極タブ３１の根本と対峙する部分によって構成されたタブ対向部２７ｇを備える。
Next, the separator 27 will be described in detail.
As shown in FIG. 3, the separator 27 is formed in a bag shape by thermally welding a first separator member 28 and a second separator member 29. The first separator member 28 and the second separator member 29 face each other. Further, the first separator member 28 and the second separator member 29 have a size that covers both surfaces of the positive electrode 21 and a rectangular shape having the same size. The separator 27 has a storage portion 27a formed of a first separator member 28 and a second separator member 29, and the positive electrode 21 is stored in the storage portion 27a. The first separator member 28 and the second separator member 29 include a protruding portion 30 that protrudes from the first side 22 c, the second side 22 e, and the third side 22 f of the positive electrode 21 in a stacked state. The separator 27 includes a tab facing portion 27g formed by a portion facing the base of the positive electrode tab 31.
セパレータ２７は、タブ対向部２７ｇを除いたはみ出し部３０同士を熱溶着して形成される溶着部３９を備える。溶着部３９は、セパレータ２７の第１の辺２７ｃ、第２の辺２７ｅ、及び第３の辺２７ｆに沿って設けられ、セパレータ２７の四辺に沿って設けられている。はみ出し部３０同士を熱溶着する際、はみ出し部３０において、正極タブ３１の根本と対峙する部分には熱を加えず、熱による収縮を発生させないようにすることでタブ対向部２７ｇを形成している。よって、第１の辺２７ｃの溶着部３９は、タブ対向部２７ｇよりも低い位置にある。 The separator 27 includes a welded portion 39 formed by thermally welding the protruding portions 30 excluding the tab facing portion 27g. The welded portion 39 is provided along the first side 27 c, the second side 27 e, and the third side 27 f of the separator 27, and is provided along the four sides of the separator 27. When the protruding portions 30 are thermally welded to each other, the tab facing portion 27g is formed by preventing heat from being applied to the portion of the protruding portion 30 that faces the base of the positive electrode tab 31 and preventing contraction due to heat. Yes. Therefore, the welding part 39 of the 1st edge | side 27c exists in a position lower than the tab opposing part 27g.
このように構成されたセパレータ２７において、第１の辺２７ｃ及び第２の辺２７ｅの長さは、負極電極２４の第１の辺２５ｃ及び第２の辺２５ｅの長さと同じであり、第３の辺２７ｆの長さは、負極電極２４の第３の辺２５ｆの長さと同じである。つまり、タブ対向部２７ｇを除いたセパレータ２７の平面視形状は、負極タブ３２を除いた負極電極２４の平面視形状と同じである。 In the separator 27 thus configured, the lengths of the first side 27c and the second side 27e are the same as the lengths of the first side 25c and the second side 25e of the negative electrode 24, and the third side The length of the side 27 f of the negative electrode 24 is the same as the length of the third side 25 f of the negative electrode 24. That is, the planar view shape of the separator 27 excluding the tab facing portion 27g is the same as the planar view shape of the negative electrode 24 excluding the negative electrode tab 32.
次に、負極電極２４について詳細に説明する。
図２及び図４に示すように、負極電極２４は、第１の辺２５ｃの一部に短絡抑制部３３を有する。この短絡抑制部３３は、第１の辺２５ｃにおいて、正極タブ３１の根本と対峙する部分を凹ませて形成されている。第１の辺２５ｃに沿った短絡抑制部３３の開口幅Ｗは、第１の辺２５ｃに沿った正極タブ３１の幅Ｗ１よりも長い。また、短絡抑制部３３において、第３の辺２５ｆに沿った深さＦは、第３の辺２５ｆに沿う方向での負極未塗工部２５ｄの長さより短く、短絡抑制部３３は、負極活物質層２６には達していない。
Next, the negative electrode 24 will be described in detail.
As shown in FIGS. 2 and 4, the negative electrode 24 has a short-circuit suppressing portion 33 on a part of the first side 25 c. The short-circuit suppressing portion 33 is formed by denting a portion facing the root of the positive electrode tab 31 on the first side 25c. The opening width W of the short-circuit suppressing portion 33 along the first side 25c is longer than the width W1 of the positive electrode tab 31 along the first side 25c. Further, in the short-circuit suppressing portion 33, the depth F along the third side 25f is shorter than the length of the negative electrode uncoated portion 25d in the direction along the third side 25f. The material layer 26 is not reached.
また、短絡抑制部３３の深さＦのうち、製造公差の範囲に含まれる最も浅い場合での深さＦは、タブ対向部２７ｇの突出長さが、製造公差の範囲に含まれる最も短い場合であっても、短絡抑制部３３の底縁と、タブ対向部２７ｇの突出端縁との間に距離を確保できる値に設定されている。 Further, among the depths F of the short-circuit suppressing portion 33, the depth F in the shallowest case included in the range of manufacturing tolerance is the shortest when the protruding length of the tab facing portion 27g is included in the range of manufacturing tolerance. Even so, it is set to a value that can ensure a distance between the bottom edge of the short-circuit suppressing portion 33 and the protruding end edge of the tab facing portion 27g.
図２に示すように、電極組立体１４では、セパレータ２７の収納部２７ａに収納された正極電極２１と、負極電極２４とは、正極活物質層２３の全面がセパレータ２７を介して負極活物質層２６に対向している。また、セパレータ２７の四辺（四つの側縁）と、負極タブ３２を除いた負極電極２４の四辺（四つの側縁）は一致しており、電極組立体１４を積層方向に見た場合は、電極組立体１４の四辺（四つの側縁）上には、セパレータ２７及び負極電極２４の四辺が位置している。 As shown in FIG. 2, in the electrode assembly 14, the positive electrode 21 and the negative electrode 24 that are accommodated in the accommodating portion 27 a of the separator 27 have the entire surface of the positive electrode active material layer 23 through the separator 27. Opposite the layer 26. In addition, the four sides (four side edges) of the separator 27 and the four sides (four side edges) of the negative electrode 24 excluding the negative electrode tab 32 coincide with each other, and when the electrode assembly 14 is viewed in the stacking direction, On the four sides (four side edges) of the electrode assembly 14, the four sides of the separator 27 and the negative electrode 24 are located.
次に、二次電池１０の作用を記載する。
二次電池１０において、正極タブ３１は、その根本がタブ対向部２７ｇに挟まれている。また、負極電極２４の短絡抑制部３３は、正極タブ３１の根本と対峙する部分で、第１の辺２５ｃから凹んでいる。このため、正極タブ３１と、負極未塗工部２５ｄとが積層方向に対向していても、正極タブ３１の根本は、その突出方向に沿った短絡抑制部３３の底縁からタブ対向部２７ｇの突出端縁までの領域で、セパレータ２７によって負極未塗工部２５ｄから絶縁されている。
Next, the operation of the secondary battery 10 will be described.
In the secondary battery 10, the base of the positive electrode tab 31 is sandwiched between the tab facing portions 27g. Further, the short-circuit suppressing portion 33 of the negative electrode 24 is a portion facing the root of the positive electrode tab 31 and is recessed from the first side 25 c. For this reason, even if the positive electrode tab 31 and the negative electrode uncoated portion 25d face each other in the stacking direction, the root of the positive electrode tab 31 extends from the bottom edge of the short-circuit suppressing portion 33 along the protruding direction to the tab facing portion 27g. In the region up to the protruding edge, the separator 27 is insulated from the negative electrode uncoated portion 25d.
上記実施形態によれば、以下のような効果を得ることができる。
（１）正極タブ３１の根本に対峙するように、セパレータ２７にタブ対向部２７ｇを設け、負極電極２４に短絡抑制部３３を設けた。よって、セパレータ２７において、正極タブ３１の根本と対峙する領域は、タブ対向部２７ｇだけでなく、タブ対向部２７ｇよりも短絡抑制部３３の深さＦだけ凹んだ領域も含まれる。よって、短絡抑制部３３が無く、タブ対向部２７ｇだけで、正極タブ３１の根本と負極電極２４とを絶縁する場合と比べると、正極タブ３１に対峙するセパレータ２７の面積が増え、積層ずれ等が生じても、正極タブ３１と負極電極２４とを絶縁することができる。
According to the above embodiment, the following effects can be obtained.
(1) A tab facing portion 27 g is provided on the separator 27 so as to face the base of the positive electrode tab 31, and a short-circuit suppressing portion 33 is provided on the negative electrode 24. Therefore, in the separator 27, the region facing the base of the positive electrode tab 31 includes not only the tab facing portion 27g but also a region recessed by the depth F of the short-circuit suppressing portion 33 from the tab facing portion 27g. Therefore, compared with the case where the base of the positive electrode tab 31 and the negative electrode 24 are insulated only by the tab facing portion 27g without the short-circuit suppressing portion 33, the area of the separator 27 facing the positive electrode tab 31 increases, stacking deviation, etc. Even if this occurs, the positive electrode tab 31 and the negative electrode 24 can be insulated.
（２）セパレータ２７にタブ対向部２７ｇを設け、負極電極２４に短絡抑制部３３を凹設することで、正極タブ３１と負極電極２４の短絡を抑制できる。よって、正極電極２１よりもサイズの一回り大きな負極電極２４を有する電極組立体１４であっても、正極タブ３１と負極電極２４の短絡抑制のために、負極電極２４の第１の辺２５ｃよりも、セパレータ２７をはみ出させる必要がなくなる。その結果として、積層方向から見て、セパレータ２７の第１の辺２７ｃと、負極電極２４の第１の辺２５ｃとを一致させることも可能になり、負極電極２４とセパレータ２７とを、タブ対向部２７ｇ及び負極タブ３２を除いた四辺を一致させることが可能になる。すなわち、負極電極２４の平面視形状と、セパレータ２７の平面視形状を同じにすることが可能になる。 (2) By providing the separator 27 with the tab facing portion 27g and providing the short-circuit suppressing portion 33 in the negative electrode 24, the short-circuit between the positive electrode tab 31 and the negative electrode 24 can be suppressed. Therefore, even in the electrode assembly 14 having the negative electrode 24 that is slightly larger in size than the positive electrode 21, the first side 25 c of the negative electrode 24 can be used to suppress a short circuit between the positive electrode tab 31 and the negative electrode 24. However, it is not necessary to protrude the separator 27. As a result, it is possible to make the first side 27c of the separator 27 coincide with the first side 25c of the negative electrode 24 when viewed from the stacking direction. The four sides excluding the portion 27g and the negative electrode tab 32 can be matched. That is, the planar view shape of the negative electrode 24 and the planar view shape of the separator 27 can be made the same.
その結果、電極組立体１４の製造において、負極電極２４とセパレータ２７をランダムに積層した後、四辺（四つの側縁）を揃えるだけで、積層ずれのない電極組立体１４を製造することができ、電極組立体１４の製造が楽になる。 As a result, in the manufacture of the electrode assembly 14, after the negative electrode 24 and the separator 27 are randomly stacked, the electrode assembly 14 with no stacking deviation can be manufactured by aligning the four sides (four side edges). The manufacture of the electrode assembly 14 is facilitated.
また、セパレータ２７の第１の辺２７ｃを、負極電極２４の第１の辺２５ｃに一致させることができるため、セパレータ２７において、負極電極２４の第１の辺２５ｃよりもはみ出ていた部分が無くなるだけ、タブ側端面３６と蓋体１３の裏面との間の空間を広げることができる。よって、タブ側端面３６と蓋体１３の裏面とのスペースに配置された基部４３ａ，４６ａが、セパレータ２７に干渉しにくくなり、この干渉を回避するために、セパレータ２７が小さくなることがない。その結果として、セパレータ２７に包まれた正極電極２１も小さくなることがなく、二次電池１０のエネルギー密度の低下がない。 Further, since the first side 27c of the separator 27 can be made to coincide with the first side 25c of the negative electrode 24, there is no portion of the separator 27 that protrudes beyond the first side 25c of the negative electrode 24. Only the space between the tab side end surface 36 and the back surface of the lid 13 can be widened. Therefore, the base portions 43a and 46a arranged in the space between the tab side end surface 36 and the back surface of the lid 13 are less likely to interfere with the separator 27, and the separator 27 is not reduced in order to avoid this interference. As a result, the positive electrode 21 wrapped in the separator 27 is not reduced, and the energy density of the secondary battery 10 is not reduced.
（３）セパレータ２７にタブ対向部２７ｇを設けたため、負極電極２４においては、短絡抑制部３３が第１の辺２７ｃから凹んでさえすれば、正極タブ３１と負極電極２４との短絡を抑制できる。セパレータ２７において、タブ対向部２７ｇは、はみ出し部３０に熱を加えたことに伴う収縮によって形成されており、はみ出し部３０での収縮量が少ない場合には、タブ対向部２７ｇの突出量が少なくなる可能性がある。しかし、負極電極２４は、金型による打ち抜きで形成できるため、短絡抑制部３３を簡単に形成でき、しかも、短絡抑制部３３の深さＦも十分に確保できる。したがって、タブ対向部２７ｇと短絡抑制部３３を併用することで、正極タブ３１と負極電極２４の短絡を抑制することのできる構成を簡単に製造することができる。 (3) Since the separator 27 is provided with the tab facing portion 27g, in the negative electrode 24, the short circuit between the positive electrode tab 31 and the negative electrode 24 can be suppressed as long as the short circuit suppressing unit 33 is recessed from the first side 27c. . In the separator 27, the tab facing portion 27g is formed by shrinkage due to heat applied to the protruding portion 30, and when the shrinkage amount at the protruding portion 30 is small, the protruding amount of the tab facing portion 27g is small. There is a possibility. However, since the negative electrode 24 can be formed by punching with a mold, the short-circuit suppressing portion 33 can be easily formed, and the depth F of the short-circuit suppressing portion 33 can be sufficiently secured. Therefore, by using the tab facing portion 27g and the short-circuit suppressing portion 33 in combination, a configuration that can suppress a short-circuit between the positive electrode tab 31 and the negative electrode 24 can be easily manufactured.
なお、上記実施形態は以下のように変更してもよい。
○ タブ対向部２７ｇは、正極タブ３１と対峙するはみ出し部３０に熱を加えず、その他のはみ出し部３０に熱を加えることに伴う収縮を利用して形成した。しかし、タブ対向部２７ｇの製造方法はこれに限らない。例えば、第１のセパレータ部材２８及び第２のセパレータ部材２９の製造時、正極タブ３１の根本と対峙する部分だけ突出させておき、第１のセパレータ部材２８と第２のセパレータ部材２９を熱溶着以外の方法で溶着し、突出させておいた部分によってタブ対向部２７ｇを形成してもよい。
In addition, you may change the said embodiment as follows.
The tab facing portion 27g was formed by utilizing the contraction that occurs when heat is applied to the other protruding portions 30 without applying heat to the protruding portion 30 that faces the positive electrode tab 31. However, the manufacturing method of the tab opposing part 27g is not restricted to this. For example, at the time of manufacturing the first separator member 28 and the second separator member 29, only the portion facing the base of the positive electrode tab 31 is protruded, and the first separator member 28 and the second separator member 29 are heat-welded. The tab facing portion 27g may be formed by a portion welded by a method other than the above and protruded.
○ 短絡抑制部３３は、第１の辺２７ｃに沿ったいずれの位置でも同じ深さＦでなくてもよく、第１の辺２７ｃに沿った位置で、深さＦが異なっていてもよい。例えば、短絡抑制部３３は、円弧状に第１の辺２７ｃから凹んでいてもよい。 The short-circuit suppressing unit 33 may not have the same depth F at any position along the first side 27c, and the depth F may be different at a position along the first side 27c. For example, the short-circuit suppressing unit 33 may be recessed from the first side 27c in an arc shape.
○ 短絡抑制部３３は、負極未塗工部２５ｄにおいて、第１の辺２５ｃから負極活物質層２６に至るまで凹んでいてもよい。すなわち、短絡抑制部３３は、第１の辺２５ｃから凹んでさえすれば、その深さＦは適宜変更してもよい。 The short-circuit suppressing unit 33 may be recessed from the first side 25c to the negative electrode active material layer 26 in the negative electrode uncoated portion 25d. That is, as long as the short-circuit suppressing unit 33 is recessed from the first side 25c, the depth F may be appropriately changed.
○ セパレータ２７の第１の辺２７ｃと、負極電極２４の第１の辺２５ｃとは積層方向に一致していなくてもよく、セパレータ２７の第１の辺２７ｃが、負極電極２４の第１の辺２５ｃよりもはみ出ていてもよい。さらに、セパレータ２７と負極電極２４は、第２の辺２５ｅ，２７ｅや第３の辺２５ｆ，２７ｆが一致していなくてもよく、セパレータ２７の辺の方が、負極電極２４の辺よりはみ出ていてもよい。 The first side 27c of the separator 27 and the first side 25c of the negative electrode 24 do not have to coincide with the stacking direction, and the first side 27c of the separator 27 is the first side of the negative electrode 24. It may protrude beyond the side 25c. Further, the separator 27 and the negative electrode 24 may not have the second sides 25e and 27e and the third sides 25f and 27f coincide with each other, and the side of the separator 27 protrudes beyond the side of the negative electrode 24. May be.
○ セパレータ２７として、第１のセパレータ部材２８と第２のセパレータ部材２９を熱溶着した袋状のものにしたが、セパレータは袋状でなく、正極電極２１と負極電極２４の間に１枚ずつ介在するシート状でもよい。この場合、各セパレータにタブ対向部が形成される。 ○ As the separator 27, the first separator member 28 and the second separator member 29 were formed into a bag shape by heat welding. However, the separator is not a bag shape, and one separator is provided between the positive electrode 21 and the negative electrode 24. An intervening sheet may be used. In this case, a tab facing portion is formed in each separator.
○ 電極組立体１４を構成する正極電極２１及び負極電極２４の枚数は適宜変更してもよい。
○ 実施形態では、負極電極２４は、負極金属箔２５の両面に負極活物質層２６を有するとしたが、負極金属箔２５の片面のみに負極活物質層２６を有していてもよい。同様に、正極電極２１は、正極金属箔２２の両面に正極活物質層２３を有するとしたが、正極金属箔２２の片面のみに正極活物質層２３を有していてもよい。
The number of the positive electrodes 21 and the negative electrodes 24 constituting the electrode assembly 14 may be changed as appropriate.
In the embodiment, the negative electrode 24 has the negative electrode active material layer 26 on both sides of the negative electrode metal foil 25, but may have the negative electrode active material layer 26 only on one side of the negative electrode metal foil 25. Similarly, the positive electrode 21 has the positive electrode active material layer 23 on both sides of the positive electrode metal foil 22, but may have the positive electrode active material layer 23 only on one side of the positive electrode metal foil 22.
○ 蓄電装置としてのニッケル水素二次電池や、電気二重層キャパシタとして具体化してもよい。
次に、上記実施形態及び別例から把握できる技術的思想について以下に追記する。
O You may actualize as a nickel-hydrogen secondary battery as an electrical storage apparatus, or an electric double layer capacitor.
Next, the technical idea that can be grasped from the above embodiment and other examples will be described below.
（イ）前記負極電極の一辺に沿った短絡抑制部の開口幅は、正極タブの幅より長い蓄電装置。 (A) The power storage device in which the opening width of the short-circuit suppressing portion along one side of the negative electrode is longer than the width of the positive electrode tab.
１０…蓄電装置としての二次電池、１４…電極組立体、２１…正極電極、２２ｃ…一辺としての第１の辺、２４…負極電極、２５ｃ…一辺としての第１の辺、２７…セパレータ、２７ａ…収納部、２７ｃ…一辺としての第１の辺、２７ｇ…タブ対向部、２８…第１のセパレータ部材、２９…第２のセパレータ部材、３０…はみ出し部、３１…正極タブ、３２…負極タブ、３３…短絡抑制部、３９…溶着部。 DESCRIPTION OF SYMBOLS 10 ... Secondary battery as a power storage device, 14 ... Electrode assembly, 21 ... Positive electrode, 22c ... First side as one side, 24 ... Negative electrode, 25c ... First side as one side, 27 ... Separator, 27a: storage portion, 27c: first side as one side, 27g: tab facing portion, 28 ... first separator member, 29 ... second separator member, 30 ... protruding portion, 31 ... positive electrode tab, 32 ... negative electrode Tab, 33 ... short-circuit suppressing portion, 39 ... welded portion.
Claims (3)
前記正極電極よりも平面視でのサイズが一回り大きく、一辺の一部から突出する負極タブを有する負極電極と、
前記正極電極と前記負極電極の間を絶縁するセパレータと、
前記正極電極、前記負極電極及び前記セパレータを積層した電極組立体と、を有する蓄電装置であって、
前記セパレータは、該セパレータの一辺の一部から突出し、かつ前記正極タブの根本を覆うタブ対向部を有し、
前記負極電極は、前記電極組立体の積層方向において前記正極タブの根本と対峙する部分に、該負極電極の一辺の一部から凹む短絡抑制部を有し、
前記セパレータは、互いに対峙する第１のセパレータ部材及び第２のセパレータ部材を熱溶着して形成されており、前記セパレータは、前記正極電極における正極タブを除いた部分を収納する収納部を有するとともに、前記収納部よりも第１のセパレータ部材及び第２のセパレータ部材の端縁側のはみ出し部において、前記正極タブの根本と対峙する部分を除いて熱溶着された溶着部を有し、
前記タブ対向部は、前記正極タブの根本と対峙する部分であり、前記熱溶着に伴う前記溶着部の収縮によって、前記溶着部に対して突出形成されていることを特徴とする蓄電装置。
A positive electrode having a positive electrode tab protruding from a part of one side;
A negative electrode having a negative tab protruding from a part of one side, the size in plan view larger than that of the positive electrode,
A separator that insulates between the positive electrode and the negative electrode;
An electrode assembly in which the positive electrode, the negative electrode, and the separator are stacked,
The separator has a tab facing portion that protrudes from a part of one side of the separator and covers a base of the positive electrode tab,
The negative electrode has a short-circuit suppressing portion that is recessed from a part of one side of the negative electrode at a portion facing the base of the positive electrode tab in the stacking direction of the electrode assembly,
The separator is formed by thermally welding a first separator member and a second separator member facing each other, and the separator has a storage portion that stores a portion of the positive electrode excluding the positive electrode tab. In addition, the protruding portion on the edge side of the first separator member and the second separator member with respect to the storage portion has a welded portion that is heat-welded except for a portion facing the base of the positive electrode tab ,
The tab facing portion is a portion facing the base of the positive electrode tab, and is formed to protrude from the welded portion by contraction of the welded portion accompanying the thermal welding .
The power storage device power storage device according to claim 1 or claim 2 which is a secondary battery.
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