JP2021180125A - Power storage element - Google Patents

Power storage element Download PDF

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JP2021180125A
JP2021180125A JP2020085254A JP2020085254A JP2021180125A JP 2021180125 A JP2021180125 A JP 2021180125A JP 2020085254 A JP2020085254 A JP 2020085254A JP 2020085254 A JP2020085254 A JP 2020085254A JP 2021180125 A JP2021180125 A JP 2021180125A
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electrode body
plate
power storage
electrode
storage element
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JP7405687B2 (en
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友和 須貝
Tomokazu Sugai
純 中村
Jun Nakamura
功 伊波
Isao Inami
元樹 星野
Motoki Hoshino
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GS Yuasa Corp
Blue Energy Co Ltd
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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
    • 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
    • Y02E60/13—Energy storage using capacitors
    • 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

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Abstract

To provide a power storage element in which damage to an electrode body due to a plate-shaped portion or an edge of a plate-shaped member connected to the electrode body is suppressed.SOLUTION: A power storage element includes a flat electrode body with laminated electrodes, a current collector 5 connected to an end portion of the electrode body in a predetermined direction orthogonal to the thickness direction of the electrode body, and a plate-shaped member that sandwiches the end portion of the electrode body together with the current collector, the thickness B at the end of the electrode body is smaller than the thickness A at the center of the electrode body as viewed from the thickness direction (X), and the plate-shaped member includes a joint portion 70 joined to the end portion of the electrode body, and a first extension portion 71 extending from the joint portion to the central portion side of the electrode body, and the first extension portion extends along the surface of the electrode body in a state of being inclined with respect to the joint portion, and at least the tip is separated from the surface of the electrode body.SELECTED DRAWING: Figure 6

Description

本発明は、電極が積層された電極体と該電極体に接合されている板状部位又は板状部材とを備える蓄電素子に関する。 The present invention relates to a power storage element including an electrode body in which electrodes are laminated and a plate-shaped portion or a plate-shaped member bonded to the electrode body.

従来から、捲回電極群を備える二次電池が知られている（特許文献１参照）。具体的に、この二次電池は、缶体と蓋とからなる電池容器を備える。缶体は、捲回電極群を収容するものである。蓋板には、外部端子が設けられている。外部端子は、集電体を介して捲回電極群に電気的に接続されている。捲回電極群は、帯状の電極をセパレータを介在させて捲回軸周りに扁平形状に捲回することで積層構造とされている。この捲回電極群では、捲回軸方向の両端部が、図９に示すように、缶体１０１の外方に向かって押し広げられることで二つの束状電極接続部１１１に分離されている。 Conventionally, a secondary battery including a winding electrode group has been known (see Patent Document 1). Specifically, this secondary battery includes a battery container including a can body and a lid. The can body accommodates a group of wound electrodes. The lid plate is provided with an external terminal. The external terminal is electrically connected to the winding electrode group via the current collector. The winding electrode group has a laminated structure by winding a strip-shaped electrode in a flat shape around the winding axis with a separator interposed therebetween. In this winding electrode group, both ends in the winding axis direction are separated into two bundled electrode connecting portions 111 by being pushed outward of the can body 101 as shown in FIG. ..

また、集電体１０２の一対の絞り加工部（捲回電極群１１０との接続部）のそれぞれは、捲回電極群１１０の高さ方向に延在する主板１０４とリブ板１０５とにより断面Ｌ字形状を呈している接合板１０３を有している。 Further, each of the pair of drawing portions (connection portions with the wound electrode group 110) of the current collector 102 has a cross section L due to the main plate 104 and the rib plate 105 extending in the height direction of the wound electrode group 110. It has a joint plate 103 having a character shape.

捲回電極群１１０の捲回軸方向の両端部において、二つの束状電極接続部１１１は、缶体１０１の両幅広面１０１ａ側のそれぞれの面において集電体１０２の接合板１０３を構成する主板１０４と超音波接合に接続されている。このとき、二つのリブ板１０５のそれぞれは、主板１０４との境界部から先端まで電極の積層部分（捲回電極群１１０）と接している。 At both ends of the winding electrode group 110 in the winding axis direction, the two bundled electrode connecting portions 111 form a bonding plate 103 of the current collector 102 on each surface of the can body 101 on both wide side surfaces 101a. It is connected to the main plate 104 and ultrasonically bonded. At this time, each of the two rib plates 105 is in contact with the laminated portion of the electrodes (turning electrode group 110) from the boundary portion with the main plate 104 to the tip end.

以上の二次電池１００では、捲回電極群１１０での電極の捲回数が増加した場合等に、束状電極接続部１１１に対するリブ板１０５に沿った部位（捲回電極群１１０の部位）表面の角度が急になるため、リブ板１０５の先端（主板１０４から離れる方向の先端）のエッジ（角部）が該部位に食い込みやすく、このエッジの食い込みによって捲回電極群１１０を構成する電極が損傷するおそれがある。 In the above secondary battery 100, when the number of times the electrode is wound in the wound electrode group 110 increases, the surface of the portion along the rib plate 105 with respect to the bundled electrode connecting portion 111 (the portion of the wound electrode group 110). Since the angle of the rib plate 105 becomes steep, the edge (corner portion) of the tip of the rib plate 105 (the tip in the direction away from the main plate 104) easily bites into the portion, and the bite of this edge causes the electrodes constituting the winding electrode group 110 to bite. May be damaged.

特許第５６６３４１５号公報Japanese Patent No. 5663415

そこで、本実施形態は、電極体に接続される板状部位又は板状部材のエッジによる該電極体の損傷が抑えられる蓄電素子を提供することを目的とする。 Therefore, an object of the present embodiment is to provide a power storage element capable of suppressing damage to the electrode body due to a plate-shaped portion connected to the electrode body or an edge of the plate-shaped member.

本実施形態の蓄電素子は、
電極が積層され且つ扁平な電極体と、
前記電極体における該電極体の厚さ方向と直交する所定方向の端部に接続される集電体と、
前記集電体と共に前記電極体の前記端部を挟み込む板状部材と、を備え、
前記電極体の前記端部の厚さは、前記厚さ方向から見た該電極体の中央部の厚さより小さく、
前記板状部材は、前記電極体の前記端部に接合されている接合部と、該接合部から前記電極体の前記中央部側に延びる第一延伸部と、を有し、
前記第一延伸部は、前記接合部に対して傾斜した状態で前記電極体の表面に沿って延び、且つ、少なくとも先端が前記電極体の表面から離間している。 The power storage element of this embodiment is
A flat electrode body with laminated electrodes,
A current collector connected to an end portion of the electrode body in a predetermined direction orthogonal to the thickness direction of the electrode body, and a current collector.
A plate-shaped member that sandwiches the end portion of the electrode body together with the current collector is provided.
The thickness of the end portion of the electrode body is smaller than the thickness of the central portion of the electrode body as viewed from the thickness direction.
The plate-shaped member has a joint portion joined to the end portion of the electrode body, and a first stretched portion extending from the joint portion toward the central portion side of the electrode body.
The first stretched portion extends along the surface of the electrode body in a state of being inclined with respect to the joint portion, and at least the tip thereof is separated from the surface of the electrode body.

かかる構成によれば、第一延伸部の先端が電極体の表面から離間しているため、蓄電素子や電極体に振動等が加わっても、第一延伸部の先端（エッジ）が電極体の表面に接触せず、これにより、前記エッジの食い込み等に起因する電極体の損傷が抑えられる。 According to this configuration, since the tip of the first stretched portion is separated from the surface of the electrode body, the tip (edge) of the first stretched portion is the electrode body even if vibration or the like is applied to the power storage element or the electrode body. It does not come into contact with the surface, whereby damage to the electrode body due to biting of the edge or the like can be suppressed.

前記蓄電素子は、
前記電極体を収容するケースを備え、
前記第一延伸部の前記先端は、前記厚さ方向において、前記中央部の端縁より内側に位置してもよい。 The power storage element is
A case for accommodating the electrode body is provided.
The tip of the first stretched portion may be located inside the edge of the central portion in the thickness direction.

かかる構成によれば、第一延伸部の先端が厚さ方向において、電極体の中央部の端縁より内側に位置しているため、第一延伸部の先端と、ケースや該ケースと電極体との間における前記厚さ方向の前記中央部の端縁位置又はその外側に位置する他の部材と、の接触が抑えられ、これにより、前記先端（エッジ）が接触することに起因するケースや前記他の部材の損傷が抑えられる。 According to this configuration, since the tip of the first stretched portion is located inside the edge of the central portion of the electrode body in the thickness direction, the tip of the first stretched portion and the case or the case and the electrode body are formed. In some cases, the contact with the edge position of the central portion in the thickness direction or another member located outside the edge position is suppressed, and thereby the tip (edge) comes into contact with the other member. Damage to the other members is suppressed.

また、前記蓄電素子では、
前記板状部材は、前記接合部から前記所定方向の前記第一延伸部側と反対側に延びる第二延伸部を有し、
前記第二延伸部は、前記接合部に対して前記厚さ方向における前記第一延伸部と同じ側に傾斜した状態で延び、
該第二延伸部の先端は、前記厚さ方向から見て前記電極体の端縁より内側で且つ前記厚さ方向において前記第一延伸部の先端より前記内側に位置してもよい。 Further, in the power storage element,
The plate-shaped member has a second stretched portion extending from the joint portion on the side opposite to the first stretched portion side in the predetermined direction.
The second stretched portion extends in a state of being inclined toward the same side as the first stretched portion in the thickness direction with respect to the joint portion.
The tip of the second stretched portion may be located inside the edge of the electrode body when viewed from the thickness direction and inside the tip of the first stretched portion in the thickness direction.

かかる構成によれば、接合部から電極体の端縁側に延びている第二延伸部の先端がケースにより接触し難く、これにより、第二延伸部の先端（エッジ）が接触することによるケースの損傷がより確実に抑えられる。 According to such a configuration, it is difficult for the tip of the second stretched portion extending from the joint portion to the edge side of the electrode body to come into contact with the case, whereby the tip (edge) of the second stretched portion comes into contact with the case. Damage is more reliably suppressed.

また、本実施形態の蓄電素子は、
外部端子と、
電極が積層され且つ扁平な電極体と、
前記電極体における該電極体の厚さ方向と直交する所定方向の端部に接続される板状部位を有し且つ前記外部端子と前記電極体とを導通させる集電体と、を備え、
前記電極体の前記端部の厚さは、前記厚さ方向から見た該電極体の中央部の厚さより小さく、
前記板状部位は、前記電極体の前記端部に接合されている接合部と、該接合部から前記電極体の前記中央部側に延びる第三延伸部と、を有し、
前記第三延伸部は、前記接合部に対して傾斜した状態で前記電極体の表面に沿って延び、且つ、少なくとも先端が前記電極体の表面から離間している。 Further, the power storage element of this embodiment is
With external terminals
A flat electrode body with laminated electrodes,
A current collector having a plate-like portion connected to an end portion of the electrode body in a predetermined direction orthogonal to the thickness direction of the electrode body and conducting the external terminal and the electrode body is provided.
The thickness of the end portion of the electrode body is smaller than the thickness of the central portion of the electrode body as viewed from the thickness direction.
The plate-shaped portion has a joint portion joined to the end portion of the electrode body and a third stretched portion extending from the joint portion toward the central portion side of the electrode body.
The third stretched portion extends along the surface of the electrode body in a state of being inclined with respect to the joint portion, and at least the tip thereof is separated from the surface of the electrode body.

かかる構成によれば、集電体における電極体との接続部位が板状の部位（板状部位）であっても、該部位のエッジ（第一延伸部の先端）が電極体の表面から離間しているため、蓄電素子や電極体に振動等が加わったときに、第一延伸部の先端（エッジ）が電極体の表面に接触せず、これにより、前記エッジの食い込み等に起因する電極体の損傷が抑えられる。 According to this configuration, even if the connection portion of the current collector with the electrode body is a plate-shaped portion (plate-shaped portion), the edge of the portion (tip of the first stretched portion) is separated from the surface of the electrode body. Therefore, when vibration or the like is applied to the power storage element or the electrode body, the tip (edge) of the first stretched portion does not come into contact with the surface of the electrode body, which causes the electrode to bite into the edge. Damage to the body is suppressed.

以上より、本実施形態によれば、電極体に接続される板状部位又は板状部材のエッジによる該電極体の損傷が抑えられる蓄電素子を提供することができる。 From the above, according to the present embodiment, it is possible to provide a power storage element in which damage to the electrode body due to a plate-shaped portion or an edge of the plate-shaped member connected to the electrode body is suppressed.

図１は、本実施形態に係る蓄電素子の斜視図である。FIG. 1 is a perspective view of a power storage element according to the present embodiment. 図２は、前記蓄電素子の分解斜視図である。FIG. 2 is an exploded perspective view of the power storage element. 図３は、前記蓄電素子が備える電極体の構成を説明するための図である。FIG. 3 is a diagram for explaining the configuration of the electrode body included in the power storage element. 図４は、蓋板に外部端子と集電体と電極体と板状部材とが組付けられた状態の図である。FIG. 4 is a diagram showing a state in which an external terminal, a current collector, an electrode body, and a plate-shaped member are assembled to a lid plate. 図５は、図４におけるＶ−Ｖ位置の断面図である。FIG. 5 is a cross-sectional view of the VV position in FIG. 図６は、図５においてＶＩで示す位置の拡大図である。FIG. 6 is an enlarged view of the position indicated by VI in FIG. 図７は、電極体に接続された状態の板状部材の拡大図である。FIG. 7 is an enlarged view of a plate-shaped member connected to the electrode body. 図８は、前記蓄電素子を備える蓄電装置の模式図である。FIG. 8 is a schematic diagram of a power storage device including the power storage element. 図９は、従来の二次電池における捲回電極群と集電体との接続部位の拡大断面図である。FIG. 9 is an enlarged cross-sectional view of a connection portion between a winding electrode group and a current collector in a conventional secondary battery.

以下、本発明の一実施形態について、図１〜図７を参照しつつ説明する。蓄電素子には、一次電池、二次電池、キャパシタ等がある。本実施形態では、蓄電素子の一例として、充放電可能な二次電池について説明する。尚、本実施形態の各構成部材（各構成要素）の名称は、本実施形態におけるものであり、背景技術における各構成部材（各構成要素）の名称と異なる場合がある。 Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 7. The power storage element includes a primary battery, a secondary battery, a capacitor and the like. In this embodiment, a rechargeable secondary battery will be described as an example of the power storage element. The names of the constituent members (each constituent element) of the present embodiment are those in the present embodiment, and may be different from the names of the respective constituent members (each constituent element) in the background art.

本実施形態の蓄電素子は、非水電解質二次電池である。より詳しくは、蓄電素子は、リチウムイオンの移動に伴って生じる電子移動を利用したリチウムイオン二次電池である。この種の蓄電素子は、電気エネルギーを供給する。蓄電素子は、単一又は複数で使用される。具体的に、蓄電素子は、要求される出力及び要求される電圧が小さいときには、単一で使用される。一方、蓄電素子は、要求される出力及び要求される電圧の少なくとも一方が大きいときには、他の蓄電素子と組み合わされて蓄電装置に用いられる。前記蓄電装置では、該蓄電装置に用いられる蓄電素子が電気エネルギーを供給する。 The power storage element of this embodiment is a non-aqueous electrolyte secondary battery. More specifically, the power storage element is a lithium ion secondary battery that utilizes electron transfer generated by the movement of lithium ions. This type of power storage element supplies electrical energy. The power storage element may be used alone or in a plurality. Specifically, the power storage element is used alone when the required output and the required voltage are small. On the other hand, when at least one of the required output and the required voltage is large, the power storage element is used in the power storage device in combination with another power storage element. In the power storage device, the power storage element used in the power storage device supplies electric energy.

蓄電素子は、図１〜図３に示すように、外部端子４と、電極２２が積層され且つ扁平な電極体２と、電極体と外部端子とを導通させる集電体５と、集電体５と共に電極体２を挟み込む板状部材７と、を備える。また、蓄電素子１は、電極体２を収容すると共に外部端子４が配置されるケース３と、電極体２とケース３との間において該ケース３の内面に沿って広がる絶縁部材６と、を備える。尚、図２に示す板状部材７は、電極体２に接続（本実施形態の例では、超音波接合）される前の状態（形状）である。 As shown in FIGS. 1 to 3, the current collecting element includes an external terminal 4, a flat electrode body 2 in which an electrode 22 is laminated, a current collector 5 for conducting the electrode body and the external terminal, and a current collector. A plate-shaped member 7 that sandwiches the electrode body 2 together with the 5 is provided. Further, the power storage element 1 includes a case 3 in which the electrode body 2 is housed and an external terminal 4 is arranged, and an insulating member 6 extending along the inner surface of the case 3 between the electrode body 2 and the case 3. Be prepared. The plate-shaped member 7 shown in FIG. 2 is in a state (shape) before being connected to the electrode body 2 (ultrasonic bonding in the example of the present embodiment).

電極体２は、電極２２が扁平に巻回されている、いわゆる巻回型の電極体である。具体的に、電極体２は、巻芯２０と、巻芯２０の周囲に巻回された電極２２とセパレータ２５とによって構成される積層体２１と、を有する。本実施形態の電極２２は、正極２３と負極２４とを含む。尚、以下では、電極体２の厚さ方向を直交座標系のＸ軸方向とし、電極体２の巻回軸Ｃの延びる方向（所定方向）を直交座標系のＹ軸方向とし、Ｘ軸方向とＹ軸方向とのそれぞれと直交する方向を直交座標系のＺ軸方向とする。 The electrode body 2 is a so-called winding type electrode body in which the electrode 22 is wound flat. Specifically, the electrode body 2 has a winding core 20 and a laminated body 21 composed of an electrode 22 wound around the winding core 20 and a separator 25. The electrode 22 of the present embodiment includes a positive electrode 23 and a negative electrode 24. In the following, the thickness direction of the electrode body 2 is defined as the X-axis direction of the Cartesian coordinate system, and the extending direction (predetermined direction) of the winding axis C of the electrode body 2 is defined as the Y-axis direction of the Cartesian coordinate system. And the direction orthogonal to each of the Y-axis direction is defined as the Z-axis direction of the Cartesian coordinate system.

積層体２１では、正極２３と負極２４とが互いに絶縁された状態で積層されている。電極体２においてリチウムイオンが正極２３と負極２４との間を移動することにより、蓄電素子１が充放電する。 In the laminated body 21, the positive electrode 23 and the negative electrode 24 are laminated in a state of being insulated from each other. Lithium ions move between the positive electrode 23 and the negative electrode 24 in the electrode body 2, so that the power storage element 1 is charged and discharged.

正極２３は、帯状の金属箔２３１と、金属箔２３１に重ねられる正極活物質層２３２と、を有する。この正極活物質層２３２は、金属箔２３１における幅方向の一方の端縁部（非被覆部）を露出させた状態で、該金属箔２３１に重ねられている。本実施形態の金属箔２３１は、例えば、アルミニウム箔である。 The positive electrode 23 has a band-shaped metal foil 231 and a positive electrode active material layer 232 superimposed on the metal foil 231. The positive electrode active material layer 232 is superposed on the metal foil 231 in a state where one edge portion (uncovered portion) in the width direction of the metal foil 231 is exposed. The metal foil 231 of the present embodiment is, for example, an aluminum foil.

負極２４は、帯状の金属箔２４１と、金属箔２４１に重ねられる負極活物質層２４２と、を有する。この負極活物質層２４２は、金属箔２４１における幅方向の他方（正極２３の金属箔２３１の非被覆部と反対側）の端縁部（非被覆部）を露出させた状態で、該金属箔２４１に重ねられている。本実施形態の金属箔２４１は、例えば、銅箔である。 The negative electrode 24 has a band-shaped metal foil 241 and a negative electrode active material layer 242 superimposed on the metal foil 241. The negative electrode active material layer 242 is formed in a state where the other edge portion (uncovered portion) of the metal foil 241 in the width direction (opposite to the uncoated portion of the metal foil 231 of the positive electrode 23) is exposed. It is overlaid on 241. The metal foil 241 of the present embodiment is, for example, a copper foil.

本実施形態の電極体２では、正極２３と負極２４とがセパレータ２５によって絶縁された状態で巻回されている。即ち、本実施形態の積層体２１では、正極２３、負極２４、及びセパレータ２５が積層されている。 In the electrode body 2 of the present embodiment, the positive electrode 23 and the negative electrode 24 are wound in a state of being insulated by the separator 25. That is, in the laminated body 21 of the present embodiment, the positive electrode 23, the negative electrode 24, and the separator 25 are laminated.

セパレータ２５は、絶縁性を有する部材であり、正極２３と負極２４との間に配置される。これにより、電極体２（詳しくは、積層体２１）において、正極２３と負極２４とが互いに絶縁される。また、セパレータ２５は、ケース３内において、電解液を保持する。これにより、蓄電素子１の充放電時において、セパレータ２５を挟んで交互に積層される正極２３と負極２４との間を、リチウムイオンが移動可能となる。 The separator 25 is an insulating member and is arranged between the positive electrode 23 and the negative electrode 24. As a result, in the electrode body 2 (specifically, the laminated body 21), the positive electrode 23 and the negative electrode 24 are insulated from each other. Further, the separator 25 holds the electrolytic solution in the case 3. As a result, when the power storage element 1 is charged and discharged, lithium ions can move between the positive electrode 23 and the negative electrode 24, which are alternately laminated with the separator 25 interposed therebetween.

このセパレータ２５は、帯状であり、例えば、ポリエチレン、ポリプロピレン、セルロース、ポリアミドなどの多孔質膜によって構成される。本実施形態のセパレータ２５は、多孔質膜によって形成された基材と、該基材の上に設けられた無機層と、を有する。この無機層は、ＳｉＯ２粒子、Ａｌ２Ｏ３粒子、ベーマイト（アルミナ水和物）等の無機粒子を含む。また、基材は、例えば、ポリエチレンによって形成される。 The separator 25 is strip-shaped and is composed of, for example, a porous membrane such as polyethylene, polypropylene, cellulose, or polyamide. The separator 25 of the present embodiment has a base material formed of a porous membrane and an inorganic layer provided on the base material. This inorganic layer contains inorganic particles such as SiO 2 particles, Al 2 O 3 particles, and boehmite (alumina hydrate). Further, the base material is formed of, for example, polyethylene.

セパレータ２５の幅方向の寸法は、負極活物質層２４２の幅より大きい。セパレータ２５は、正極活物質層２３２と負極活物質層２４２とが厚さ方向（積層方向）に重なるように幅方向に位置ずれした状態で重ね合わされた正極２３と負極２４との間に配置される。このとき、正極２３の非被覆部と、負極２４の非被覆部とは重なっていない。即ち、正極２３の非被覆部が、正極２３と負極２４との重なる領域から幅方向（積層方向と直交する方向）に突出し、且つ、負極２４の非被覆部が、正極２３と負極２４との重なる領域から幅方向（正極２３の非被覆部の突出方向と反対の方向）に突出する。このような積層状態（相対位置）となるように、正極２３、負極２４、及びセパレータ２５が巻芯２０の周囲に巻回されることによって、電極体２が形成される。また、本実施形態の電極体２では、正極２３の非被覆部又は負極２４の非被覆部のみが積層された部位によって、電極体２における非被覆積層部２６が構成される。 The widthwise dimension of the separator 25 is larger than the width of the negative electrode active material layer 242. The separator 25 is arranged between the positive electrode 23 and the negative electrode 24 in which the positive electrode active material layer 232 and the negative electrode active material layer 242 are overlapped with each other in a state of being displaced in the width direction so as to overlap in the thickness direction (stacking direction). NS. At this time, the uncoated portion of the positive electrode 23 and the uncoated portion of the negative electrode 24 do not overlap. That is, the uncoated portion of the positive electrode 23 protrudes in the width direction (direction orthogonal to the stacking direction) from the overlapping region of the positive electrode 23 and the negative electrode 24, and the uncoated portion of the negative electrode 24 is the positive electrode 23 and the negative electrode 24. It protrudes from the overlapping region in the width direction (the direction opposite to the protruding direction of the uncovered portion of the positive electrode 23). The electrode body 2 is formed by winding the positive electrode 23, the negative electrode 24, and the separator 25 around the winding core 20 so as to be in such a laminated state (relative position). Further, in the electrode body 2 of the present embodiment, the uncoated laminated portion 26 in the electrode body 2 is configured by the portion where only the uncoated portion of the positive electrode 23 or the uncoated portion of the negative electrode 24 is laminated.

非被覆積層部２６は、電極体２の各極に設けられる。即ち、正極２３の非被覆部のみが積層された非被覆積層部２６が電極体２における正極の非被覆積層部を構成し、負極２４の非被覆部のみが積層された非被覆積層部２６が電極体２における負極の非被覆積層部を構成する。これら二つの非被覆積層部２６（詳しくは、正極の非被覆積層部２６と負極の非被覆積層部２６と）は、電極体２において、巻回軸Ｃ方向の両端部にそれぞれ形成されている。即ち、二つの非被覆積層部２６は、電極体２の巻回軸Ｃ方向の各端部を構成している。 The uncoated laminated portion 26 is provided at each pole of the electrode body 2. That is, the uncoated laminated portion 26 in which only the uncoated portion of the positive electrode 23 is laminated constitutes the uncoated laminated portion of the positive electrode in the electrode body 2, and the uncoated laminated portion 26 in which only the uncoated portion of the negative electrode 24 is laminated is formed. It constitutes an uncoated laminated portion of the negative electrode in the electrode body 2. These two uncoated laminated portions 26 (specifically, the uncoated laminated portion 26 of the positive electrode and the uncoated laminated portion 26 of the negative electrode) are formed at both ends in the winding axis C direction in the electrode body 2, respectively. .. That is, the two uncoated laminated portions 26 constitute each end portion of the electrode body 2 in the winding axis C direction.

この非被覆積層部２６は、図４及び図５にも示すように、集電体５と板状部材７とによって挟み込まれることで集電体５と導通状態で接続されている。本実施形態の蓄電素子１では、電極体２と集電体５と板状部材７とは、超音波接合によって接続されている。この集電体５と板状部材７との挟み込みにより、非被覆積層部（電極体２の端部）２６の厚さ（Ｘ軸方向の寸法）は、Ｘ軸方向から見た電極体２のＹ軸方向の中央部２７の厚さより、小さくなっている。これにより、非被覆積層部２６における中央部２７側の部位では、Ｙ軸方向における電極体２の中心側に向かうに伴い、厚さが漸増している。尚、本実施形態の電極体２では、前記中央部は、電極体２において最も厚さの大きい部位であり、各電極２３、２４の活物質層２３２、２４２の配置されている部位である。 As shown in FIGS. 4 and 5, the uncoated laminated portion 26 is connected to the current collector 5 in a conductive state by being sandwiched between the current collector 5 and the plate-shaped member 7. In the power storage element 1 of the present embodiment, the electrode body 2, the current collector 5, and the plate-shaped member 7 are connected by ultrasonic bonding. Due to the sandwiching between the current collector 5 and the plate-shaped member 7, the thickness (dimension in the X-axis direction) of the uncoated laminated portion (end portion of the electrode body 2) 26 is the same as that of the electrode body 2 seen from the X-axis direction. It is smaller than the thickness of the central portion 27 in the Y-axis direction. As a result, the thickness of the portion of the uncoated laminated portion 26 on the central portion 27 side gradually increases toward the central side of the electrode body 2 in the Y-axis direction. In the electrode body 2 of the present embodiment, the central portion is a portion having the largest thickness in the electrode body 2, and is a portion in which the active material layers 232 and 242 of the electrodes 23 and 24 are arranged.

ケース３は、電極体２と共に電解液を収容する。具体的に、ケース３は、開口を有するケース本体３１と、ケース本体３１の開口を塞ぐ（閉じる）蓋板３２と、を有する。このケース３は、電解液に耐性を有する金属によって形成される。本実施形態のケース３は、例えば、アルミニウム、又は、アルミニウム合金等のアルミニウム系金属によって形成される。 The case 3 houses the electrolytic solution together with the electrode body 2. Specifically, the case 3 has a case main body 31 having an opening and a lid plate 32 that closes (closes) the opening of the case main body 31. The case 3 is formed of a metal that is resistant to the electrolytic solution. Case 3 of the present embodiment is formed of, for example, aluminum or an aluminum-based metal such as an aluminum alloy.

電解液は、非水溶液系電解液である。電解液は、有機溶媒に電解質塩を溶解させることによって得られる。有機溶媒は、例えば、プロピレンカーボネート及びエチレンカーボネートなどの環状炭酸エステル類、ジメチルカーボネート、ジエチルカーボネート、及びエチルメチルカーボネートなどの鎖状カーボネート類である。電解質塩は、ＬｉＣｌＯ４、ＬｉＢＦ４、及びＬｉＰＦ６等である。本実施形態の電解液は、エチレンカーボネート、ジメチルカーボネート、及びエチルメチルカーボネートを、エチレンカーボネート：ジメチルカーボネート：エチルメチルカーボネート＝３：２：５の割合で調整した混合溶媒に、１ｍｏｌ／ＬのＬｉＰＦ６を溶解させたものである。 The electrolytic solution is a non-aqueous electrolyte solution. The electrolytic solution is obtained by dissolving an electrolyte salt in an organic solvent. The organic solvent is, for example, cyclic carbonates such as propylene carbonate and ethylene carbonate, and chain carbonates such as dimethyl carbonate, diethyl carbonate, and ethylmethyl carbonate. Electrolyte salts are LiClO 4 , LiBF 4 , LiPF 6 , and the like. The electrolytic solution of the present embodiment contains 1 mol / L LiPF 6 in a mixed solvent prepared by adjusting ethylene carbonate, dimethyl carbonate, and ethyl methyl carbonate in a ratio of ethylene carbonate: dimethyl carbonate: ethyl methyl carbonate = 3: 2: 5. Is dissolved.

ケース本体３１は、板状の閉塞部３１１と、閉塞部３１１の周縁に接続される筒状の胴部（周壁）３１２と、を備える。 The case body 31 includes a plate-shaped closing portion 311 and a cylindrical body portion (peripheral wall) 312 connected to the peripheral edge of the closing portion 311.

閉塞部３１１は、ケース本体３１が開口を上に向けた姿勢で配置されたときにケース本体３１の下端に位置する（即ち、前記開口が上を向いたときのケース本体３１の底壁となる）部位である。閉塞部３１１は、該閉塞部３１１の法線方向から見て、矩形状である。 The closing portion 311 is located at the lower end of the case body 31 when the case body 31 is arranged with the opening facing upward (that is, becomes the bottom wall of the case body 31 when the opening faces upward). ) It is a part. The closed portion 311 has a rectangular shape when viewed from the normal direction of the closed portion 311.

胴部３１２は、角筒形状、より詳しくは、偏平な角筒形状である。胴部３１２は、閉塞部３１１の周縁における長辺から延びる一対の長壁部３１３と、閉塞部３１１の周縁における短辺から延びる一対の短壁部３１４とを有する。即ち、一対の長壁部３１３は、Ｙ軸方向に間隔（詳しくは、閉塞部３１１の周縁における短辺に相当する間隔）を空けて対向し、一対の短壁部３１４は、Ｘ軸方向に間隔（詳しくは、閉塞部３１１の周縁における長辺に相当する間隔）を空けて対向する。短壁部３１４が一対の長壁部３１３の対応（詳しくは、Ｙ軸方向に対向）する端部同士をそれぞれ接続することによって、角筒状の胴部３１２が形成される。 The body portion 312 has a square tube shape, more specifically, a flat square tube shape. The body portion 312 has a pair of long wall portions 313 extending from the long side at the peripheral edge of the closed portion 311 and a pair of short wall portions 314 extending from the short side at the peripheral edge of the closed portion 311. That is, the pair of long wall portions 313 face each other with an interval in the Y-axis direction (specifically, the interval corresponding to the short side at the peripheral edge of the closed portion 311), and the pair of short wall portions 314 are spaced in the X-axis direction. (Specifically, they face each other with an interval corresponding to the long side at the peripheral edge of the closed portion 311). A square cylindrical body portion 312 is formed by connecting the end portions of the short wall portion 314 corresponding to each other (specifically, facing in the Y-axis direction) of the pair of long wall portions 313.

以上のように、ケース本体３１は、開口方向（Ｚ軸方向）における一方の端部が塞がれた角筒形状（即ち、有底角筒形状）を有する。 As described above, the case body 31 has a square tube shape (that is, a bottomed square tube shape) in which one end in the opening direction (Z-axis direction) is closed.

蓋板３２は、ケース本体３１の開口を塞ぐ板状の部材である。本実施形態の蓋板３２は、Ｚ軸方向から見て、Ｘ軸方向に長い矩形状の板材である。この蓋板３２は、ケース本体３１の開口を塞ぐように、蓋板３２の周縁部がケース本体３１の開口周縁部３４に重ねられる。 The lid plate 32 is a plate-shaped member that closes the opening of the case body 31. The lid plate 32 of the present embodiment is a rectangular plate material long in the X-axis direction when viewed from the Z-axis direction. In the lid plate 32, the peripheral edge portion of the lid plate 32 is overlapped with the opening peripheral edge portion 34 of the case main body 31 so as to close the opening of the case main body 31.

外部端子４は、他の蓄電素子の外部端子又は外部機器等と電気的に接続される部位である。この外部端子４は、導電性を有する部材によって形成される。例えば、外部端子４は、アルミニウム又はアルミニウム合金等のアルミニウム系金属材料、銅又は銅合金等の銅系金属材料等の溶接性の高い金属材料によって形成される。 The external terminal 4 is a portion electrically connected to an external terminal of another power storage element, an external device, or the like. The external terminal 4 is formed of a conductive member. For example, the external terminal 4 is formed of an aluminum-based metal material such as aluminum or an aluminum alloy, or a highly weldable metal material such as copper or a copper-based metal material such as a copper alloy.

具体的に、外部端子４は、バスバ等が溶接可能な面４１Ａを有する端子本体４１と、ケース３を貫通する貫通部と、を備える。 Specifically, the external terminal 4 includes a terminal body 41 having a surface 41A to which a bus bar or the like can be welded, and a penetrating portion penetrating the case 3.

端子本体４１は、蓋板３２に沿って拡がる板状の部位である。本実施形態の端子本体４１は、Ｚ軸方向から見て矩形状である。 The terminal body 41 is a plate-shaped portion that extends along the lid plate 32. The terminal body 41 of the present embodiment has a rectangular shape when viewed from the Z-axis direction.

貫通部は、ケース３の内部に配置される集電体５と、ケース３の外部に配置される端子本体４１とを導通させる。本実施形態の貫通部は、導電性を有する金属によって構成され、端子本体４１と一体に形成されている。この貫通部は、端子本体４１から蓋板３２を貫通してケース３内に延びている。詳しくは、貫通部は、端子本体４１からケース３内に延び、端子本体４１と共同して、蓋板３２や集電体５等をＺ軸方向に挟み込む。これにより、外部端子４及び集電体５が蓋板３２に固定されると共に、外部端子４と集電体５とが導通する。 The penetrating portion conducts the current collector 5 arranged inside the case 3 and the terminal body 41 arranged outside the case 3. The penetrating portion of the present embodiment is made of a conductive metal and is integrally formed with the terminal body 41. This penetrating portion penetrates the lid plate 32 from the terminal main body 41 and extends into the case 3. Specifically, the penetrating portion extends from the terminal body 41 into the case 3, and together with the terminal body 41, sandwiches the lid plate 32, the current collector 5, and the like in the Z-axis direction. As a result, the external terminal 4 and the current collector 5 are fixed to the lid plate 32, and the external terminal 4 and the current collector 5 are electrically connected to each other.

集電体５は、ケース３内に配置され、電極体２と導通可能に直接又は間接に接続される。この集電体５は、電極体２の正極の非被覆積層部２６と、負極の非被覆積層部２６とのそれぞれに接続されている。即ち、蓄電素子１は、二つの集電体５を備える。本実施形態の集電体５は、電極体２における該電極体２の厚さ方向（Ｘ軸方向）と直交する所定方向（本実施形態の例ではＹ軸方向）の端部に接続されている（図４及び図５参照）。より詳しくは、各集電体５は、板状部材７と共に電極体２の非被覆積層部２６を挟み込んだ状態で該電極体２（詳しくは、非被覆積層部２６）に接続されている。 The current collector 5 is arranged in the case 3 and is directly or indirectly connected to the electrode body 2 so as to be conductive. The current collector 5 is connected to each of the uncoated laminated portion 26 of the positive electrode of the electrode body 2 and the uncoated laminated portion 26 of the negative electrode. That is, the power storage element 1 includes two current collectors 5. The current collector 5 of the present embodiment is connected to an end portion of the electrode body 2 in a predetermined direction (Y-axis direction in the example of the present embodiment) orthogonal to the thickness direction (X-axis direction) of the electrode body 2. (See FIGS. 4 and 5). More specifically, each current collector 5 is connected to the electrode body 2 (specifically, the uncoated laminated portion 26) in a state of sandwiching the uncoated laminated portion 26 of the electrode body 2 together with the plate-shaped member 7.

集電体５は、導電性を有する部材によって形成される。これにより、集電体５は、外部端子４の貫通部と電極体２の非被覆積層部２６とを導通可能に接続する。この集電体５は、ケース３の内面に沿って配置される。 The current collector 5 is formed of a conductive member. As a result, the current collector 5 connects the penetrating portion of the external terminal 4 and the uncoated laminated portion 26 of the electrode body 2 so as to be conductive. The current collector 5 is arranged along the inner surface of the case 3.

具体的に、集電体５は、外部端子４の貫通部と通電可能に接続される第一接続部５１と、第一接続部５１から延び且つ電極体２と導通可能に接続される第二接続部５２と、を有する。この集電体５では、第一接続部５１が外部端子４の貫通部から蓋板３２に沿って短壁部３１４へ向けて延びると共に、第二接続部５２が第一接続部５１の短壁部３１４側の端部から長壁部３１３に沿って閉塞部３１１に向けて延びている。 Specifically, the current collector 5 has a first connection portion 51 that is electrically connected to the penetrating portion of the external terminal 4, and a second connection portion that extends from the first connection portion 51 and is conductively connected to the electrode body 2. It has a connecting portion 52 and. In the current collector 5, the first connection portion 51 extends from the penetrating portion of the external terminal 4 toward the short wall portion 314 along the lid plate 32, and the second connection portion 52 extends from the short wall of the first connection portion 51. It extends from the end on the side of the portion 314 toward the closed portion 311 along the long wall portion 313.

第一接続部５１は、矩形板状の部位である。また、第二接続部５２は、帯板状の部位であり、長壁部３１３に沿ってＺ軸方向に延びる基部５２１と、基部５２１から該基部５２１に対して傾斜方向に延びる傾斜部５２２と、傾斜部５２２からＺ軸方向に延びる集電体接合部５２３と、を有する。本実施形態の集電体接合部５２３は、矩形の板状部位であり、非被覆積層部２６のＸ軸方向における一方の面に面接触するように接続（本実施形態の例では、超音波接合）されている。 The first connection portion 51 is a rectangular plate-shaped portion. Further, the second connecting portion 52 is a strip-shaped portion, and has a base portion 521 extending in the Z-axis direction along the long wall portion 313, and an inclined portion 522 extending in the inclined direction from the base portion 521 with respect to the base portion 521. It has a current collector joint portion 523 extending from the inclined portion 522 in the Z-axis direction. The current collector bonding portion 523 of the present embodiment is a rectangular plate-shaped portion, and is connected so as to be in surface contact with one surface of the uncoated laminated portion 26 in the X-axis direction (in the example of the present embodiment, ultrasonic waves). It is joined).

以上のように構成される集電体５は、所定形状に裁断された板状の金属材料が曲げ加工されることによって形成されている。 The current collector 5 configured as described above is formed by bending a plate-shaped metal material cut into a predetermined shape.

板状部材７は、正極の非被覆積層部２６と、負極の非被覆積層部２６とにそれぞれ配置されている。即ち、蓄電素子１は、二つの板状部材７を備える。電極体２への接合前の状態では、各板状部材７は、矩形の板状であり（図２参照）、本実施形態の板状部材７の厚さは、例えば、０．２ｍｍである。この板状部材７は、図４〜図７に示すように、電極体２の非被覆積層部２６に接合されている板状部材接合部（接合部）７０と、板状部材接合部７０から電極体２の中央部２７側に延びる第一延伸部７１と、を有する。また、板状部材７は、板状部材接合部７０からＹ軸方向の第一延伸部７１側と反対側に延びる第二延伸部７２を有する。 The plate-shaped member 7 is arranged in the uncoated laminated portion 26 of the positive electrode and the uncoated laminated portion 26 of the negative electrode, respectively. That is, the power storage element 1 includes two plate-shaped members 7. In the state before joining to the electrode body 2, each plate-shaped member 7 has a rectangular plate shape (see FIG. 2), and the thickness of the plate-shaped member 7 of the present embodiment is, for example, 0.2 mm. .. As shown in FIGS. 4 to 7, the plate-shaped member 7 is formed from the plate-shaped member joint portion (joint portion) 70 joined to the uncoated laminated portion 26 of the electrode body 2 and the plate-shaped member joint portion 70. It has a first stretched portion 71 extending toward the central portion 27 side of the electrode body 2. Further, the plate-shaped member 7 has a second stretched portion 72 extending from the plate-shaped member joint portion 70 to the side opposite to the first stretched portion 71 side in the Y-axis direction.

板状部材接合部７０は、板状部材７において非被覆積層部２６に接合されている部位である。本実施形態の板状部材接合部７０は、超音波接合によって非被覆積層部２６に接合されたＺ軸方向に長尺な矩形状の部位（領域）である。この板状部材接合部７０は、板状部材７においてＹ軸方向における中央部よりも外側（電極体２のＹ軸方向の端縁側）にずれた位置に形成されている。 The plate-shaped member joint portion 70 is a portion of the plate-shaped member 7 that is joined to the uncoated laminated portion 26. The plate-shaped member joint portion 70 of the present embodiment is a rectangular portion (region) elongated in the Z-axis direction joined to the uncoated laminated portion 26 by ultrasonic bonding. The plate-shaped member joint 70 is formed at a position shifted outward from the central portion in the Y-axis direction (end edge side in the Y-axis direction of the electrode body 2) in the plate-shaped member 7.

第一延伸部７１は、板状部材接合部７０に対して傾斜した状態で電極体２の表面に沿って延び、且つ、少なくとも先端７１ａが電極体２の表面から離間している。この第一延伸部７１の先端７１ａは、電極体２の中央部２７と接し且つＸ軸方向と直交する仮想面ＶよりＸ軸方向の板状部材接合部７０側（図６における下側）に位置している。即ち、第一延伸部７１の先端は、Ｘ軸方向において、中央部２７の端縁より内側に位置している。 The first stretched portion 71 extends along the surface of the electrode body 2 in an inclined state with respect to the plate-shaped member joint portion 70, and at least the tip end 71a is separated from the surface of the electrode body 2. The tip 71a of the first stretched portion 71 is on the plate-shaped member joint portion 70 side (lower side in FIG. 6) in the X-axis direction from the virtual surface V which is in contact with the central portion 27 of the electrode body 2 and is orthogonal to the X-axis direction. positioned. That is, the tip of the first stretched portion 71 is located inside the edge of the central portion 27 in the X-axis direction.

第二延伸部７２は、板状部材接合部７０に対してＸ軸方向における第一延伸部７１と同じ側に傾斜した状態で延びている。第二延伸部７２の先端７２ａは、Ｘ軸方向から見て電極体２のＹ軸方向の端縁より内側に位置し、且つＸ軸方向において第一延伸部７１の先端７１ａより板状部材接合部７０側（内側）に位置している（図６参照）。 The second stretched portion 72 extends in a state of being inclined toward the same side as the first stretched portion 71 in the X-axis direction with respect to the plate-shaped member joint portion 70. The tip 72a of the second stretched portion 72 is located inside the edge of the electrode body 2 in the Y-axis direction when viewed from the X-axis direction, and a plate-shaped member is joined from the tip 71a of the first stretched portion 71 in the X-axis direction. It is located on the side (inside) of the portion 70 (see FIG. 6).

以上のような板状部材７及び集電体５が接合された状態の電極体２のＹ軸方向の端部では、各構成２６、５、７同士は、以下の関係を満たしている。 At the ends of the electrode body 2 in the state where the plate-shaped member 7 and the current collector 5 are joined as described above in the Y-axis direction, the configurations 26, 5 and 7 satisfy the following relationships.

本実施形態の蓄電素子１は、電極体のＹ軸方向の中央部２７の厚さ（Ｘ軸方向の寸法）をＡとし、非被覆積層部２６における集電体５と板状部材７とによって挟み込まれた部位の厚さをＢとし、板状部材７の厚さをＣとしたときに、本実施形態の蓄電素子１では、Ｂ＞Ｃ、且つ、０．０５≦（（Ｂ＋Ｃ）／Ａ）≦０．０９の関係を満たしている。 In the power storage element 1 of the present embodiment, the thickness (dimension in the X-axis direction) of the central portion 27 in the Y-axis direction of the electrode body is set to A, and the current collector 5 and the plate-shaped member 7 in the uncoated laminated portion 26 are used. When the thickness of the sandwiched portion is B and the thickness of the plate-shaped member 7 is C, in the power storage element 1 of the present embodiment, B> C and 0.05 ≦ ((B + C) / A). ) ≤ 0.09.

また、本実施形態の蓄電素子１は、Ｘ−Ｙ面（Ｘ軸方向とＹ軸方向とを含む面：図６参照）での断面において、板状部材接合部７０に対する第一延伸部７１の角度θは、電極体のＹ軸方向の端縁から板状部材接合部７０の第一延伸部７１側の端縁までのＹ軸方向の寸法をＤとし、非被覆積層部２６のＹ軸方向の寸法をＥとしたときに、ｔａｎθ＝（Ａ／２）／（Ｅ−Ｄ）、且つ、１．２＜ｔａｎθ＜２．６５の関係を満たしている。 Further, the power storage element 1 of the present embodiment has a first stretched portion 71 with respect to the plate-shaped member joint portion 70 in a cross section on an XY plane (a plane including the X-axis direction and the Y-axis direction: see FIG. 6). The angle θ is the Y-axis direction of the uncoated laminated portion 26, where D is the dimension in the Y-axis direction from the end edge in the Y-axis direction of the electrode body to the end edge on the first stretched portion 71 side of the plate-shaped member joint portion 70. When the dimension of is E, the relationship of tan θ = (A / 2) / (ED) and 1.2 <tan θ <2.65 is satisfied.

また、本実施形態の蓄電素子１は、Ｙ軸方向における第一延伸部７１の先端７１ａと板状部材接合部７０の第一延伸部７１側の端縁との距離をＸとすると、Ｘ／Ｃ＞５の関係を満たしている。 Further, in the power storage element 1 of the present embodiment, where X is the distance between the tip 71a of the first stretched portion 71 and the edge of the plate-shaped member joint 70 on the first stretched portion 71 side in the Y-axis direction, X / The relationship of C> 5 is satisfied.

図２に戻り、絶縁部材６は、ケース３（詳しくはケース本体３１）と電極体２との間に配置される。この絶縁部材６は、所定の形状に裁断された絶縁性を有するシート状の部材を折り曲げることによって袋状に形成されている。この袋状の絶縁部材６は、電極体２に接合された集電体５及び板状部材７と共に、電極体２の表面を覆った状態で、電極体２とケース３との間に配置される。 Returning to FIG. 2, the insulating member 6 is arranged between the case 3 (specifically, the case body 31) and the electrode body 2. The insulating member 6 is formed in a bag shape by bending a sheet-shaped member having an insulating property cut into a predetermined shape. The bag-shaped insulating member 6 is arranged between the electrode body 2 and the case 3 in a state of covering the surface of the electrode body 2 together with the current collector 5 and the plate-shaped member 7 joined to the electrode body 2. NS.

以上のように構成される蓄電素子１は、以下のように製造される。 The power storage element 1 configured as described above is manufactured as follows.

外部端子４と共に蓋板３２に組付けられた集電体５に電極体２が接続される。本実施形態の蓄電素子１の製造方法では、集電体５と電極体２とは、超音波接合によって接続される。具体的には、以下の通りである。 The electrode body 2 is connected to the current collector 5 assembled to the lid plate 32 together with the external terminal 4. In the method of manufacturing the power storage element 1 of the present embodiment, the current collector 5 and the electrode body 2 are connected by ultrasonic bonding. Specifically, it is as follows.

集電体５の集電体接合部５２３と平板状の板状部材７とが、電極体２の非被覆積層部２６の厚さ方向（Ｘ軸方向）の両側に配置される。この状態で、重ね合わされた集電体接合部５２３と非被覆積層部２６と板状部材７とが、超音波接合器のホーンとアンビルとによって挟み込まれ、超音波接合が行われる。 The current collector joint portion 523 of the current collector 5 and the flat plate-shaped member 7 are arranged on both sides of the uncoated laminated portion 26 of the electrode body 2 in the thickness direction (X-axis direction). In this state, the superposed current collector bonding portion 523, the uncoated laminated portion 26, and the plate-shaped member 7 are sandwiched between the horn and the anvil of the ultrasonic bonding device, and ultrasonic bonding is performed.

このとき、板状部材７におけるホーンとの当接部位は、Ｙ軸方向における中央部より非被覆積層部２６の外側（電極体２の端縁側）にずれた位置である。そして、ホーンが、重ね合わされた板状部材７と非被覆積層部２６と集電体接合部５２３とをアンビルに向けて押圧した状態で超音波振動する。これにより、板状部材接合部７０（板状部材７におけるホーンの当接部位）が非被覆積層部２６の厚さ方向（電極２２の積層方向）内側に沈み込むと共に、第一延伸部７１及び第二延伸部７２が板状部材接合部７０に対して傾斜するように板状部材７が変形し、集電体５と電極体２と板状部材７とが超音波接合される。この第一延伸部７１が板状部材接合部７０に対して傾斜することによって、第一延伸部７１の少なくとも先端７１ａが電極体２の表面から離間した状態となる（図６参照）。 At this time, the contact portion of the plate-shaped member 7 with the horn is a position shifted from the central portion in the Y-axis direction to the outside of the uncoated laminated portion 26 (end edge side of the electrode body 2). Then, the horn ultrasonically vibrates in a state where the laminated plate-shaped member 7, the uncoated laminated portion 26, and the current collector joint portion 523 are pressed toward the anvil. As a result, the plate-shaped member joint portion 70 (the contact portion of the horn in the plate-shaped member 7) sinks inward in the thickness direction (stacking direction of the electrodes 22) of the uncoated laminated portion 26, and the first stretched portion 71 and the first stretched portion 71 and The plate-shaped member 7 is deformed so that the second stretched portion 72 is inclined with respect to the plate-shaped member joining portion 70, and the current collector 5, the electrode body 2, and the plate-shaped member 7 are ultrasonically bonded. When the first stretched portion 71 is inclined with respect to the plate-shaped member joint portion 70, at least the tip 71a of the first stretched portion 71 is in a state of being separated from the surface of the electrode body 2 (see FIG. 6).

次に、蓋板３２に組付けられた電極体２が袋状の絶縁部材６に収容され、これにより、電極体２に接合された集電体５（詳しくは、第二接続部５２）及び板状部材７と共に、電極体２の表面が絶縁部材６によって覆われる。 Next, the electrode body 2 assembled to the lid plate 32 is housed in the bag-shaped insulating member 6, whereby the current collector 5 (specifically, the second connection portion 52) and the current collector 5 bonded to the electrode body 2 and The surface of the electrode body 2 is covered with the insulating member 6 together with the plate-shaped member 7.

続いて、この蓋板３２に組付けられ且つ絶縁部材６によって表面が覆われた状態の電極体２が、ケース本体３１に挿入される。蓋板３２がケース本体３１の開口周縁部３４に重なる（当接する）位置まで、電極体２がケース本体３１に挿入されると、この状態で、蓋板３２の周縁部とケース本体３１の開口周縁部３４とが溶接され、蓋板３２とケース本体３１との境界部が密閉される。本実施形態の蓋板３２とケース本体３１との溶接は、レーザー溶接によって行われる。 Subsequently, the electrode body 2 assembled to the lid plate 32 and whose surface is covered with the insulating member 6 is inserted into the case body 31. When the electrode body 2 is inserted into the case body 31 until the lid plate 32 overlaps (contacts) the opening peripheral edge portion 34 of the case body 31, in this state, the peripheral edge portion of the lid plate 32 and the opening of the case body 31 are opened. The peripheral edge portion 34 is welded, and the boundary portion between the lid plate 32 and the case body 31 is sealed. Welding of the lid plate 32 and the case body 31 of the present embodiment is performed by laser welding.

このケース本体３１と蓋板３２とが溶接された後、ケース３内に電解液が注入されることで、蓄電素子１が完成する。 After the case body 31 and the lid plate 32 are welded together, the electrolytic solution is injected into the case 3 to complete the power storage element 1.

以上の蓄電素子によれば、第一延伸部７１の先端７１ａが電極体２の表面から離間しているため（図６参照）、蓄電素子１や電極体２に振動等が加わっても、第一延伸部７１の先端７１ａ（特に、エッジ）が電極体２の表面に接触せず、これにより、前記エッジの食い込み等に起因する電極体２の損傷が抑えられる。 According to the above power storage element, since the tip 71a of the first stretched portion 71 is separated from the surface of the electrode body 2 (see FIG. 6), even if vibration or the like is applied to the power storage element 1 or the electrode body 2, the first The tip 71a (particularly, the edge) of the stretched portion 71 does not come into contact with the surface of the electrode body 2, thereby suppressing damage to the electrode body 2 due to biting of the edge or the like.

また、本実施形態の蓄電素子１では、第一延伸部７１の先端７１ａは、電極体２の中央部（電極体２において最も厚さの大きい部位）と接し且つＸ軸方向と直交する仮想面ＶよりＸ軸方向の板状部材接合部７０側に位置している。即ち、第一延伸部７１の先端７１ａは、Ｘ軸方向において、中央部２７の端縁より内側に位置している（図６参照）。このように、第一延伸部７１の先端７１ａが電極体２の中央部２７（仮想面Ｖ）よりＸ軸方向の板状部材接合部７０側に位置していることで、該先端７１ａと、ケース３や該ケース３と電極体２との間におけるＸ軸方向の中央部２７の端縁位置又はその外側に位置する他の部材（本実施形態の例では、絶縁部材６）と、の接触が抑えられ、これにより、先端７１ａ（エッジ）が接触することに起因するケース３や他の部材（絶縁部材６）の損傷が抑えられる。 Further, in the power storage element 1 of the present embodiment, the tip 71a of the first stretched portion 71 is in contact with the central portion of the electrode body 2 (the thickest portion in the electrode body 2) and is a virtual surface orthogonal to the X-axis direction. It is located on the plate-shaped member joint 70 side in the X-axis direction from V. That is, the tip 71a of the first stretched portion 71 is located inside the edge of the central portion 27 in the X-axis direction (see FIG. 6). As described above, since the tip 71a of the first stretched portion 71 is located on the plate-shaped member joint 70 side in the X-axis direction from the central portion 27 (virtual surface V) of the electrode body 2, the tip 71a and the tip 71a are Contact with the case 3 or another member (insulating member 6 in the example of the present embodiment) located at the edge position of the central portion 27 in the X-axis direction or outside the case 3 between the case 3 and the electrode body 2. This suppresses damage to the case 3 and other members (insulating member 6) due to contact with the tip 71a (edge).

また、本実施形態の蓄電素子１では、第二延伸部７２の先端７２ａが、Ｙ軸方向において電極体２の端縁より内側で且つＸ軸方向において第一延伸部７１の先端７１ａより板状部材接合部７０側（内側）に位置している。このため、板状部材接合部７０から電極体２の端縁側に延びている第二延伸部７２の先端７２ａがケース３により接触し難く、これにより、第二延伸部７２の先端７２ａ（エッジ）が接触することによるケース３の損傷がより確実に抑えられる。 Further, in the power storage element 1 of the present embodiment, the tip 72a of the second stretched portion 72 has a plate shape inside the edge of the electrode body 2 in the Y-axis direction and from the tip 71a of the first stretched portion 71 in the X-axis direction. It is located on the member joint 70 side (inside). Therefore, the tip 72a of the second stretched portion 72 extending from the plate-shaped member joint 70 to the end edge side of the electrode body 2 is less likely to come into contact with the case 3, whereby the tip 72a (edge) of the second stretched portion 72. Damage to the case 3 due to contact with the case 3 is more reliably suppressed.

尚、本発明の蓄電素子は、上記実施形態に限定されるものではなく、本発明の要旨を逸脱しない範囲内において種々変更を加え得ることは勿論である。例えば、ある実施形態の構成に他の実施形態の構成を追加することができ、また、ある実施形態の構成の一部を他の実施形態の構成に置き換えることができる。さらに、ある実施形態の構成の一部を削除することができる。 It should be noted that the power storage element of the present invention is not limited to the above embodiment, and it is needless to say that various modifications can be made without departing from the gist of the present invention. For example, the configuration of one embodiment can be added to the configuration of another embodiment, and a part of the configuration of one embodiment can be replaced with the configuration of another embodiment. In addition, some of the configurations of certain embodiments can be deleted.

上記実施形態の蓄電素子１では、板状部材７は、第一延伸部７１と第二延伸部７２とを有しているが、この構成に限定されない。板状部材７は、第一延伸部７１と第二延伸部７２とのうちの少なくとも第一延伸部７１を有していればよい。 In the power storage element 1 of the above embodiment, the plate-shaped member 7 has a first stretched portion 71 and a second stretched portion 72, but the configuration is not limited to this. The plate-shaped member 7 may have at least the first stretched portion 71 of the first stretched portion 71 and the second stretched portion 72.

また、上記実施形態の蓄電素子１では、第一延伸部７１の先端７１ａが、電極体２の中央部（電極体２において最も厚さの大きい部位）２７と接し且つＸ軸方向と直交する仮想面ＶよりＸ軸方向の板状部材接合部７０側に位置しているが、この構成に限定されない。第一延伸部７１の少なくとも先端７１ａが電極体２の表面から離間していれば、該先端７１ａが仮想面ＶよりＸ軸方向の板状部材接合部７０側に位置していない構成でもよい。 Further, in the power storage element 1 of the above embodiment, the tip 71a of the first stretched portion 71 is in contact with the central portion 27 of the electrode body 2 (the thickest portion in the electrode body 2) 27 and is orthogonal to the X-axis direction. It is located on the plate-shaped member joint 70 side in the X-axis direction from the surface V, but is not limited to this configuration. As long as at least the tip 71a of the first stretched portion 71 is separated from the surface of the electrode body 2, the tip 71a may not be located on the plate-shaped member joint 70 side in the X-axis direction from the virtual surface V.

また、上記実施形態の蓄電素子１では、第二延伸部７２の先端７２ａが、Ｙ軸方向において電極体２の端縁より内側で且つＸ軸方向において第一延伸部７１の先端７１ａより板状部材接合部７０側に位置しているが、この構成に限定されない。第二延伸部７２の先端７２ａが、Ｙ軸方向において電極体２の端縁より外側に位置してもよく、Ｘ軸方向において第一延伸部７１の先端７１ａより板状部材接合部７０から離れる側に位置する構成であってもよい。 Further, in the power storage element 1 of the above embodiment, the tip 72a of the second stretched portion 72 has a plate shape inside the edge of the electrode body 2 in the Y-axis direction and from the tip 71a of the first stretched portion 71 in the X-axis direction. Although it is located on the member joint 70 side, it is not limited to this configuration. The tip 72a of the second stretched portion 72 may be located outside the edge of the electrode body 2 in the Y-axis direction, and is separated from the plate-shaped member joint 70 by the tip 71a of the first stretched portion 71 in the X-axis direction. It may be configured to be located on the side.

また、上記実施形態の蓄電素子１では、板状部材７が第一延伸部７１や第二延伸部７２を有し、集電体５の集電体接合部（非被覆積層部２６と接合する板状部位）５２３は、平板状であるが、この構成に限定されない。集電体５の集電体接合部（非被覆積層部２６との接合部位）５２３が、板状部材７の板状部材接合部７０に相当する部位と、第一延伸部７１に相当する部位と、を有していていもよい。また、集電体接合部５２３が、板状部材７の板状部材接合部７０に相当する部位と、第一延伸部７１に相当する部位と、に加え、第二延伸部７２に相当する部位も有していてもよい。 Further, in the power storage element 1 of the above embodiment, the plate-shaped member 7 has the first stretched portion 71 and the second stretched portion 72, and is joined to the current collector joint portion (uncoated laminated portion 26) of the current collector 5. The plate-shaped portion) 523 has a flat plate shape, but is not limited to this configuration. The current collector joint portion (joint portion with the uncoated laminated portion 26) 523 of the current collector 5 corresponds to the plate-shaped member joint portion 70 of the plate-shaped member 7 and the portion corresponding to the first stretched portion 71. And may have. Further, the current collector joint portion 523 corresponds to a portion corresponding to the plate-shaped member joint portion 70 of the plate-shaped member 7, a portion corresponding to the first stretched portion 71, and a portion corresponding to the second stretched portion 72. You may also have.

かかる構成によっても、第一延伸部７１の先端７１ａに相当する部位が電極体２の表面から離間していることで、蓄電素子１や電極体２に振動等が加わったときに、第一延伸部７１の先端７１ａに相当する部位が電極体２の表面に接触せず、これにより、該電極体２を構成する電極２２の損傷が抑えられる。 Even with this configuration, the portion corresponding to the tip 71a of the first stretching portion 71 is separated from the surface of the electrode body 2, so that the first stretching is performed when vibration or the like is applied to the power storage element 1 or the electrode body 2. The portion corresponding to the tip 71a of the portion 71 does not come into contact with the surface of the electrode body 2, whereby damage to the electrode 22 constituting the electrode body 2 is suppressed.

また、上記実施形態においては、蓄電素子が充放電可能な非水電解質二次電池（例えばリチウムイオン二次電池）として用いられる場合について説明したが、蓄電素子の種類や大きさ（容量）は任意である。また、上記実施形態において、蓄電素子の一例として、リチウムイオン二次電池について説明したが、これに限定されるものではない。例えば、本発明は、種々の二次電池、その他、一次電池や、電気二重層キャパシタ等のキャパシタの蓄電素子にも適用可能である。 Further, in the above embodiment, the case where the power storage element is used as a chargeable / dischargeable non-aqueous electrolyte secondary battery (for example, a lithium ion secondary battery) has been described, but the type and size (capacity) of the power storage element are arbitrary. Is. Further, in the above embodiment, the lithium ion secondary battery has been described as an example of the power storage element, but the present invention is not limited thereto. For example, the present invention can be applied to various secondary batteries, other primary batteries, and storage elements of capacitors such as electric double layer capacitors.

蓄電素子（例えば電池）１は、図８に示すような蓄電装置（蓄電素子が電池の場合は電池モジュール）１１に用いられてもよい。蓄電装置１１は、少なくとも二つの蓄電素子１と、二つの（異なる）蓄電素子１同士を電気的に接続するバスバ部材１２と、を有する。この場合、本発明の技術が少なくとも一つの蓄電素子１に適用されていればよい。 The power storage element (for example, a battery) 1 may be used in a power storage device (battery module when the power storage element is a battery) 11 as shown in FIG. The power storage device 11 includes at least two power storage elements 1 and a bus bar member 12 that electrically connects two (different) power storage elements 1 to each other. In this case, the technique of the present invention may be applied to at least one power storage element 1.

１…蓄電素子、２…電極体、２０…巻芯、２１…積層体、２２…電極、２３…正極（電極）、２３１…金属箔、２３２…正極活物質層（活物質層）、２４…負極（電極）、２４１…金属箔、２４２…負極活物質層（活物質層）、２５…セパレータ、２６…非被覆積層部、２７…中央部、３…ケース、３１…ケース本体、３１１…閉塞部、３１２…胴部、３１３…長壁部、３１４…短壁部、３２…蓋板、３４…開口周縁部、４…外部端子、４１…端子本体、４１Ａ…面、５…集電体、５１…第一接続部、５２…第二接続部、５２１…基部、５２２…傾斜部、５２３…集電体接合部、６…絶縁部材、７…板状部材、７０…板状部材接合部（接合部）、７１…第一延伸部、７１ａ…先端、７２…第二延伸部、７２ａ…先端、１１…蓄電装置、１２…バスバ部材、１００…二次電池、１０１…缶体、１０１ａ…両幅広面、１０２…集電体、１０３…接合板、１０４…主板、１０５…リブ板、１１０…捲回電極群、１１１…束状電極接続部、Ｃ…巻回軸、Ｖ…仮想面 1 ... power storage element, 2 ... electrode body, 20 ... winding core, 21 ... laminated body, 22 ... electrode, 23 ... positive electrode (electrode), 231 ... metal foil, 232 ... positive electrode active material layer (active material layer), 24 ... Negative electrode (electrode), 241 ... Metal foil, 242 ... Negative electrode active material layer (active material layer), 25 ... Separator, 26 ... Uncoated laminated part, 27 ... Central part, 3 ... Case, 31 ... Case body, 311 ... Closure Part, 312 ... Body part, 313 ... Long wall part, 314 ... Short wall part, 32 ... Lid plate, 34 ... Opening peripheral part, 4 ... External terminal, 41 ... Terminal body, 41A ... Surface, 5 ... Current collector, 51 ... First connection portion, 52 ... Second connection portion, 521 ... Base portion, 522 ... Inclined portion, 523 ... Current collector joint portion, 6 ... Insulation member, 7 ... Plate-like member, 70 ... Plate-like member joint portion (joint) Part), 71 ... First stretched part, 71a ... Tip, 72 ... Second stretched part, 72a ... Tip, 11 ... Power storage device, 12 ... Bus bar member, 100 ... Secondary battery, 101 ... Can body, 101a ... Both wide Surface, 102 ... Current collector, 103 ... Joint plate, 104 ... Main plate, 105 ... Rib plate, 110 ... Winding electrode group, 111 ... Bundled electrode connection, C ... Winding shaft, V ... Virtual surface

Claims (4)

電極が積層され且つ扁平な電極体と、
前記電極体における該電極体の厚さ方向と直交する所定方向の端部に接続される集電体と、
前記集電体と共に前記電極体の前記端部を挟み込む板状部材と、を備え、
前記電極体の前記端部の厚さは、前記厚さ方向から見た該電極体の中央部の厚さより小さく、
前記板状部材は、前記電極体の前記端部に接合されている接合部と、該接合部から前記電極体の前記中央部側に延びる第一延伸部と、を有し、
前記第一延伸部は、前記接合部に対して傾斜した状態で前記電極体の表面に沿って延び、且つ、少なくとも先端が前記電極体の表面から離間している、蓄電素子。 A flat electrode body with laminated electrodes,
A current collector connected to an end portion of the electrode body in a predetermined direction orthogonal to the thickness direction of the electrode body, and a current collector.
A plate-shaped member that sandwiches the end portion of the electrode body together with the current collector is provided.
The thickness of the end portion of the electrode body is smaller than the thickness of the central portion of the electrode body as viewed from the thickness direction.
The plate-shaped member has a joint portion joined to the end portion of the electrode body, and a first stretched portion extending from the joint portion toward the central portion side of the electrode body.
The first stretched portion is a power storage element that extends along the surface of the electrode body in a state of being inclined with respect to the joint portion, and at least the tip thereof is separated from the surface of the electrode body. 前記電極体を収容するケースを備え、
前記第一延伸部の前記先端は、前記厚さ方向において、前記中央部の端縁より内側に位置する、請求項１に記載の蓄電素子。 A case for accommodating the electrode body is provided.
The power storage element according to claim 1, wherein the tip of the first stretched portion is located inside the edge of the central portion in the thickness direction. 前記板状部材は、前記接合部から前記所定方向の前記第一延伸部側と反対側に延びる第二延伸部を有し、
前記第二延伸部は、前記接合部に対して前記厚さ方向における前記第一延伸部と同じ側に傾斜した状態で延び、
該第二延伸部の先端は、前記厚さ方向から見て前記電極体の端縁より内側で且つ前記厚さ方向において前記第一延伸部の先端より前記内側に位置する、請求項２に記載の蓄電素子。 The plate-shaped member has a second stretched portion extending from the joint portion on the side opposite to the first stretched portion side in the predetermined direction.
The second stretched portion extends in a state of being inclined toward the same side as the first stretched portion in the thickness direction with respect to the joint portion.
The second aspect of claim 2, wherein the tip of the second stretched portion is located inside the edge of the electrode body when viewed from the thickness direction and inside the tip of the first stretched portion in the thickness direction. Power storage element. 外部端子と、
電極が積層され且つ扁平な電極体と、
前記電極体における該電極体の厚さ方向と直交する所定方向の端部に接続される板状部位を有し且つ前記外部端子と前記電極体とを導通させる集電体と、を備え、
前記電極体の前記端部の厚さは、前記厚さ方向から見た該電極体の中央部の厚さより小さく、
前記板状部位は、前記電極体の前記端部に接合されている接合部と、該接合部から前記電極体の前記中央部側に延びる第三延伸部と、を有し、
前記第三延伸部は、前記接合部に対して傾斜した状態で前記電極体の表面に沿って延び、且つ、少なくとも先端が前記電極体の表面から離間している、蓄電素子。 With external terminals
A flat electrode body with laminated electrodes,
A current collector having a plate-like portion connected to an end portion of the electrode body in a predetermined direction orthogonal to the thickness direction of the electrode body and conducting the external terminal and the electrode body is provided.
The thickness of the end portion of the electrode body is smaller than the thickness of the central portion of the electrode body as viewed from the thickness direction.
The plate-shaped portion has a joint portion joined to the end portion of the electrode body and a third stretched portion extending from the joint portion toward the central portion side of the electrode body.
The third stretched portion is a power storage element that extends along the surface of the electrode body in a state of being inclined with respect to the joint portion, and at least the tip thereof is separated from the surface of the electrode body.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013065552A (en) * 2011-08-31 2013-04-11 Gs Yuasa Corp Power storage element
WO2013125271A1 (en) * 2012-02-22 2013-08-29 株式会社Ｇｓユアサ Electrical storage element
WO2013168466A1 (en) * 2012-05-10 2013-11-14 株式会社Ｇｓユアサ Electric storage element
JP2016225117A (en) * 2015-05-29 2016-12-28 株式会社東芝 Secondary battery
JP2019061881A (en) * 2017-09-27 2019-04-18 株式会社Ｇｓユアサ Power storage element

Family Cites Families (1)

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JP7133137B2 (en) 2017-11-13 2022-09-08 株式会社Ｇｓユアサ Storage element

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013065552A (en) * 2011-08-31 2013-04-11 Gs Yuasa Corp Power storage element
WO2013125271A1 (en) * 2012-02-22 2013-08-29 株式会社Ｇｓユアサ Electrical storage element
WO2013168466A1 (en) * 2012-05-10 2013-11-14 株式会社Ｇｓユアサ Electric storage element
JP2016225117A (en) * 2015-05-29 2016-12-28 株式会社東芝 Secondary battery
JP2019061881A (en) * 2017-09-27 2019-04-18 株式会社Ｇｓユアサ Power storage element

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