JP6939010B2 - Power storage device - Google Patents

Power storage device Download PDF

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JP6939010B2
JP6939010B2 JP2017063029A JP2017063029A JP6939010B2 JP 6939010 B2 JP6939010 B2 JP 6939010B2 JP 2017063029 A JP2017063029 A JP 2017063029A JP 2017063029 A JP2017063029 A JP 2017063029A JP 6939010 B2 JP6939010 B2 JP 6939010B2
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electrode
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electrode assembly
case
storage device
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JP2018166065A (en
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厚志 南形
厚志 南形
雅人 小笠原
雅人 小笠原
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Toyota Industries Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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Description

本発明は、電極組立体と、電極組立体を覆う絶縁シートと、絶縁シートによって覆われた電極組立体を収容するケースとを備えた蓄電装置に関する。 The present invention relates to a power storage device including an electrode assembly, an insulating sheet covering the electrode assembly, and a case for accommodating the electrode assembly covered with the insulating sheet.

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。二次電池は、正極電極及び負極電極が積層又は巻回された電極組立体と、電極組立体及び電解液を収容する有底筒状のケースとを備える。電極組立体とケースとは、電極組立体を覆う絶縁シートによって絶縁されている（特許文献１参照）。 Vehicles such as EVs (Electric Vehicles) and PHVs (Plug-in Hybrid Vehicles) are equipped with a secondary battery as a power storage device that stores the power supplied to the traveling motor. The secondary battery includes an electrode assembly in which a positive electrode and a negative electrode are laminated or wound, and a bottomed tubular case for accommodating the electrode assembly and the electrolytic solution. The electrode assembly and the case are insulated by an insulating sheet that covers the electrode assembly (see Patent Document 1).

特開２０１４−３８７３６号公報Japanese Unexamined Patent Publication No. 2014-38736

このような二次電池では、充放電時の正極電極及び負極電極の積層方向への膨張によるケースの変形を抑制すべく、ケースを拘束治具によって積層方向に拘束する。このとき、例えば、電極組立体の収容後にケース内に混入した異物や、電極組立体の収容前にケース内に混入し、電解液の注入により浮上した異物が、電極組立体と絶縁シートとの間や絶縁シートとケースの内面との間に挟まっていることがある。異物は、積層方向への電極組立体の膨張により、絶縁シートに食い込み、絶縁シートを突き破るおそれがある。絶縁シートの破れは、電極組立体とケースとの短絡につながる。 In such a secondary battery, the case is restrained in the stacking direction by a restraining jig in order to suppress deformation of the case due to expansion of the positive electrode and the negative electrode in the stacking direction during charging and discharging. At this time, for example, foreign matter mixed in the case after accommodating the electrode assembly or foreign matter mixed in the case before accommodating the electrode assembly and floating by injecting the electrolytic solution is transferred to the electrode assembly and the insulating sheet. It may be sandwiched between the space or between the insulating sheet and the inner surface of the case. Foreign matter may bite into the insulating sheet and break through the insulating sheet due to the expansion of the electrode assembly in the stacking direction. A tear in the insulation sheet leads to a short circuit between the electrode assembly and the case.

本発明は、上記課題を解決するためになされたものであり、その目的は、電極組立体と絶縁シートとの間又は絶縁シートとケースの内面との間に異物が挟まることを規制できる蓄電装置を提供することにある。 The present invention has been made to solve the above problems, and an object of the present invention is a power storage device capable of restricting foreign matter from being caught between an electrode assembly and an insulating sheet or between an insulating sheet and an inner surface of a case. Is to provide.

上記問題点を解決するための蓄電装置は、複数のシート状の第１の電極と、前記第１の電極と極性及び大きさの異なる複数のシート状の第２の電極とが絶縁された状態で交互に積層された電極組立体と、前記電極組立体を覆う絶縁シートと、前記絶縁シートによって覆われた前記電極組立体を収容するケースと、を備えた蓄電装置であって、前記電極組立体は、積層方向の端面に、全ての前記第１の電極及び前記第２の電極が対向する対向部が投影される第１領域と、前記第１領域よりも外側に位置する第２領域とを有し、前記端面と前記絶縁シートとの間、又は前記端面に対向した絶縁シートと前記ケースとの間に配置され、かつ前記積層方向から見た側面視で、前記第１領域と前記第２領域の境界部に沿って配置される規制部材を備えることを要旨とする。 The power storage device for solving the above problems is in a state in which a plurality of sheet-shaped first electrodes and a plurality of sheet-shaped second electrodes having different polarities and sizes are insulated from the first electrode. A power storage device including an electrode assembly alternately laminated with, an insulating sheet covering the electrode assembly, and a case for accommodating the electrode assembly covered with the insulating sheet, wherein the electrode assembly is provided. The solid has a first region in which all the first electrodes and facing portions facing the second electrodes are projected on the end faces in the stacking direction, and a second region located outside the first region. The first region and the first region are arranged between the end face and the insulating sheet, or between the insulating sheet facing the end face and the case, and viewed from the side view from the stacking direction. The gist is to provide a regulating member arranged along the boundary between the two regions.

蓄電装置を積層方向に拘束した状態で充放電した場合、電極組立体の積層方向への膨張に伴い第１領域は加圧状態となるため、電極組立体の積層方向の端面と絶縁シートとの間や端面に対向した絶縁シートとケースの内面との間への異物の侵入が抑制される。一方、第２領域は、電極組立体が積層方向へ膨張しても非加圧状態であるため、電極組立体の積層方向の端面と絶縁シートとの間や端面に対向した絶縁シートとケースの内面との間に隙間ができやすい。規制部材を備えない蓄電装置では、隙間から侵入した異物は、境界部において電極組立体の積層方向の端面と絶縁シートとの間や、端面に対向した絶縁シートとケースの内面との間に挟まることがある。これに対し、境界部に沿って配置された規制部材を備える蓄電装置では、電極組立体の端面と絶縁シートとの間や絶縁シートとケースの内面との間に異物が挟まることを規制できる。 When the power storage device is charged and discharged while being restrained in the stacking direction, the first region is in a pressurized state as the electrode assembly expands in the stacking direction. Foreign matter is suppressed from entering between the insulating sheet facing the space or the end face and the inner surface of the case. On the other hand, since the second region is in a non-pressurized state even when the electrode assembly expands in the stacking direction, the insulating sheet and the case face between the end face of the electrode assembly in the stacking direction and the insulating sheet or face the end face. A gap is likely to be created between the inner surface and the inner surface. In a power storage device that does not have a regulating member, foreign matter that has entered through the gap is sandwiched between the end face of the electrode assembly in the stacking direction and the insulating sheet at the boundary, or between the insulating sheet facing the end face and the inner surface of the case. Sometimes. On the other hand, in the power storage device including the regulating member arranged along the boundary portion, it is possible to regulate that foreign matter is caught between the end surface of the electrode assembly and the insulating sheet or between the insulating sheet and the inner surface of the case.

また、上記蓄電装置について、前記ケースは、前記絶縁シートによって覆われた前記電極組立体を収容する有底筒状のケース本体、及び前記ケース本体の開口部を閉塞する蓋を有し、前記規制部材は、前記側面視で、前記境界部のうち前記蓋側に位置する部分に沿って配置されているのが好ましい。 Further, regarding the power storage device, the case has a bottomed cylindrical case body for accommodating the electrode assembly covered with the insulating sheet, and a lid for closing the opening of the case body. It is preferable that the members are arranged along the portion of the boundary portion located on the lid side in the side view.

境界部のうち蓋側に位置する部分に沿って規制部材を配置することで、電極組立体をケース本体に収容した後でケース内に混入した異物が、境界部において電極組立体の端面と絶縁シートとの間や端面に対向した絶縁シートとケース本体の内面との間に挟まることを規制できる。 By arranging the regulating member along the portion of the boundary portion located on the lid side, foreign matter mixed in the case after the electrode assembly is housed in the case body is insulated from the end face of the electrode assembly at the boundary portion. It is possible to regulate the sandwiching between the sheet and the insulating sheet facing the end face and the inner surface of the case body.

また、上記蓄電装置について、前記規制部材は、前記端面と前記絶縁シートとの間に配置されているのが好ましい。
これによれば、絶縁シートとケースとの間に規制部材を設ける場合よりも、規制部材を電極組立体の近傍に配置できるため、境界部の位置を把握しやすい。よって、規制部材を容易に配置できる。 Further, with respect to the power storage device, it is preferable that the regulating member is arranged between the end face and the insulating sheet.
According to this, since the regulating member can be arranged in the vicinity of the electrode assembly as compared with the case where the regulating member is provided between the insulating sheet and the case, it is easy to grasp the position of the boundary portion. Therefore, the regulating member can be easily arranged.

また、上記蓄電装置について、前記規制部材は、テープであるのが好ましい。
これによれば、規制部材を電極組立体や絶縁シート、ケースに対して貼着することで、規制部材を容易に配置できる。 Further, with respect to the power storage device, the regulating member is preferably a tape.
According to this, the regulating member can be easily arranged by attaching the regulating member to the electrode assembly, the insulating sheet, and the case.

上記問題点を解決するための蓄電装置は、長尺帯状の第１の電極と、前記第１の電極と極性の異なる長尺帯状の第２の電極とが絶縁された状態で積層され、かつ偏平状に巻回された電極組立体と、前記電極組立体を覆う絶縁シートと、前記絶縁シートによって覆われた前記電極組立体を収容するケースと、を備えた蓄電装置であって、前記電極組立体の偏平面と前記絶縁シートとの間、又は前記偏平面に対向した絶縁シートと前記ケースとの間に配置され、かつ前記偏平面と直交する方向から見た側面視で、前記偏平面の縁部に沿って配置される規制部材を備えることを要旨とする。 In the power storage device for solving the above problems, the long strip-shaped first electrode and the long strip-shaped second electrode having a different polarity from the first electrode are laminated in an insulated state, and are laminated. A power storage device including a flatly wound electrode assembly, an insulating sheet covering the electrode assembly, and a case for accommodating the electrode assembly covered with the insulating sheet, wherein the electrode is provided. The eccentric plane is arranged between the eccentric plane of the assembly and the insulating sheet, or between the insulating sheet facing the eccentric plane and the case, and is viewed from a side view from a direction orthogonal to the eccentric plane. The gist is to provide a regulating member arranged along the edge of the.

蓄電装置を偏平面と直交する方向に拘束した状態で充放電した場合、偏平面は、充放電時の電極組立体の積層方向への膨張に伴い、加圧状態となるため、電極組立体の偏平面と絶縁シートとの間や偏平面と対向した絶縁シートとケースの内面との間への異物の侵入が抑制される。しかしながら、偏平面の縁部では、規制部材を備えない蓄電装置の場合、電極組立体と絶縁シートとの間や、絶縁シートとケースの内面との間に隙間ができるため、異物が挟まることがある。これに対し、縁部に沿って配置された規制部材を備える蓄電装置では、偏平面の縁部において、電極組立体と絶縁シートとの間や、絶縁シートとケースの内面との間に異物が挟まることを規制できる。 When the power storage device is charged and discharged while being constrained in a direction orthogonal to the eccentric plane, the eccentric plane becomes a pressurized state as the electrode assembly expands in the stacking direction during charging and discharging. Foreign matter is suppressed from entering between the flat surface and the insulating sheet or between the insulating sheet facing the flat surface and the inner surface of the case. However, at the edge of the eccentric plane, in the case of a power storage device not provided with a regulating member, a gap may be formed between the electrode assembly and the insulating sheet or between the insulating sheet and the inner surface of the case, so that foreign matter may be caught. be. On the other hand, in the power storage device provided with the regulating member arranged along the edge portion, foreign matter is generated between the electrode assembly and the insulating sheet or between the insulating sheet and the inner surface of the case at the edge portion of the eccentric plane. You can regulate pinching.

本発明によれば、電極組立体と絶縁シートとの間又は絶縁シートとケースの内面との間に異物が挟まることを規制できる。 According to the present invention, it is possible to regulate that foreign matter is caught between the electrode assembly and the insulating sheet or between the insulating sheet and the inner surface of the case.

第１の実施形態の二次電池の分解斜視図。An exploded perspective view of the secondary battery of the first embodiment. 拘束治具によって拘束された二次電池の斜視図。The perspective view of the secondary battery restrained by the restraint jig. 第１の実施形態の電極組立体の分解斜視図。An exploded perspective view of the electrode assembly of the first embodiment. （ａ），（ｂ）は第１の実施形態の二次電池の断面図。(A) and (b) are cross-sectional views of the secondary battery of the first embodiment. （ａ），（ｂ）は第２の実施形態の二次電池の断面図。(A) and (b) are cross-sectional views of the secondary battery of the second embodiment. 別例の二次電池の断面図。Sectional drawing of the secondary battery of another example. 別例の二次電池の断面図。Sectional drawing of the secondary battery of another example.

（第１の実施形態）
以下、蓄電装置を二次電池に具体化した第１の実施形態を図１〜図４にしたがって説明する。 (First Embodiment)
Hereinafter, a first embodiment in which the power storage device is embodied in a secondary battery will be described with reference to FIGS. 1 to 4.

図１及び図２に示すように、蓄電装置としての二次電池１０は、ケース１１を備える。二次電池１０は、ケース１１に収容された電極組立体１２及び電解液（図示せず）を備える。ケース１１は、直方体状のケース本体１３と、ケース本体１３の開口部１３ａを閉塞する矩形平板状の蓋１４とを有する。ケース１１を構成するケース本体１３と蓋１４は、何れも金属製（例えば、ステンレスやアルミニウム）である。また、本実施形態の二次電池１０は、その外観が角型をなす角型電池である。また、本実施形態の二次電池１０は、リチウムイオン電池である。 As shown in FIGS. 1 and 2, the secondary battery 10 as a power storage device includes a case 11. The secondary battery 10 includes an electrode assembly 12 housed in a case 11 and an electrolytic solution (not shown). The case 11 has a rectangular parallelepiped case body 13 and a rectangular flat plate-shaped lid 14 that closes the opening 13a of the case body 13. The case body 13 and the lid 14 constituting the case 11 are both made of metal (for example, stainless steel or aluminum). Further, the secondary battery 10 of the present embodiment is a square battery having a square appearance. Further, the secondary battery 10 of the present embodiment is a lithium ion battery.

ケース本体１３は、底面１３ｂと、底面１３ｂに繋がる第１〜第４壁部１３ｃ〜１３ｆとを備える。ケース本体１３は、底面１３ｂの一対の長縁部に繋がる壁部のうちの一方の壁部に第１壁部１３ｃを備え、第１壁部１３ｃと対面する他方の壁部に第２壁部１３ｄを備える。また、ケース本体１３は、第１壁部１３ｃと第２壁部１３ｄとを繋ぎ、底面１３ｂの一対の短縁部に繋がる壁部のうちの一方の壁部に第３壁部１３ｅを備え、第３壁部１３ｅと対面する他方の壁部に第４壁部１３ｆを備える。 The case body 13 includes a bottom surface 13b and first to fourth wall portions 13c to 13f connected to the bottom surface 13b. The case body 13 is provided with a first wall portion 13c on one of the wall portions connected to the pair of long edges of the bottom surface 13b, and a second wall portion on the other wall portion facing the first wall portion 13c. 13d is provided. Further, the case body 13 is provided with a third wall portion 13e on one of the wall portions that connects the first wall portion 13c and the second wall portion 13d and is connected to the pair of short edge portions of the bottom surface 13b. A fourth wall portion 13f is provided on the other wall portion facing the third wall portion 13e.

二次電池１０は、電極組立体１２から電気を取り出すための正極端子１５と負極端子１６を備える。正極端子１５と負極端子１６は、蓋１４に所定の間隔をあけて並設された一対の孔１４ａからケース１１の外部に露出される。また、正極端子１５及び負極端子１６には、ケース１１から絶縁するためのリング状の絶縁リング１７ａがそれぞれ取り付けられている。 The secondary battery 10 includes a positive electrode terminal 15 and a negative electrode terminal 16 for extracting electricity from the electrode assembly 12. The positive electrode terminal 15 and the negative electrode terminal 16 are exposed to the outside of the case 11 through a pair of holes 14a arranged side by side on the lid 14 at predetermined intervals. Further, a ring-shaped insulating ring 17a for insulating from the case 11 is attached to the positive electrode terminal 15 and the negative electrode terminal 16, respectively.

図３に示すように、電極組立体１２は、第１の電極としての複数のシート状の正極電極２０と、第２の電極としての複数のシート状の負極電極２１と、複数のシート状のセパレータ３０とを備える。電極組立体１２は、正極電極２０と負極電極２１との間にセパレータ３０を介在させ、かつ相互に絶縁させた状態で積層した構造を備える。正極電極２０、負極電極２１、及びセパレータ３０が積層された方向を積層方向とする。 As shown in FIG. 3, the electrode assembly 12 has a plurality of sheet-shaped positive electrode 20 as a first electrode, a plurality of sheet-shaped negative electrode 21 as a second electrode, and a plurality of sheet-shaped negative electrodes. A separator 30 is provided. The electrode assembly 12 has a structure in which a separator 30 is interposed between the positive electrode 20 and the negative electrode 21 and is laminated in a state of being insulated from each other. The direction in which the positive electrode 20, the negative electrode 21, and the separator 30 are laminated is defined as the stacking direction.

正極電極２０は、矩形シート状の集電体としての正極金属箔（例えばアルミニウム箔）２２と、正極金属箔２２の両面に存在する正極活物質層２３とを有する。正極電極２０は、一対の長辺に沿う縁部のうちの一方の縁部に第１縁部２０ａを備える。正極電極２０は、第１縁部２０ａの一部から突出した形状の正極タブ２４を有する。正極タブ２４は、正極活物質層２３が存在せず、正極金属箔２２そのもので構成されている。 The positive electrode electrode 20 has a positive electrode metal foil (for example, an aluminum foil) 22 as a current collector in the shape of a rectangular sheet, and a positive electrode active material layer 23 existing on both sides of the positive electrode metal foil 22. The positive electrode 20 includes a first edge portion 20a on one edge portion of the edge portions along the pair of long sides. The positive electrode electrode 20 has a positive electrode tab 24 having a shape protruding from a part of the first edge portion 20a. The positive electrode tab 24 does not have the positive electrode active material layer 23 and is composed of the positive electrode metal foil 22 itself.

また、正極電極２０は、一対の長辺に沿う縁部のうちの第１縁部２０ａの対辺となる他方の縁部に第２縁部２０ｂを備える。さらに、正極電極２０は、第１縁部２０ａと第２縁部２０ｂ同士を繋ぐ一対の短辺に沿う縁部のうちの一方の縁部に第３縁部２０ｃを備え、第３縁部２０ｃの対辺となる他方の縁部に第４縁部２０ｄを備える。 Further, the positive electrode electrode 20 includes a second edge portion 20b on the other edge portion which is the opposite side of the first edge portion 20a among the edge portions along the pair of long sides. Further, the positive electrode 20 includes a third edge portion 20c on one edge portion of one of the edge portions along the pair of short sides connecting the first edge portion 20a and the second edge portion 20b, and the third edge portion 20c. A fourth edge portion 20d is provided on the other edge portion which is the opposite side of the above.

負極電極２１は、矩形シート状の集電体としての負極金属箔（例えば銅箔）２５と、負極金属箔２５の両面に存在する負極活物質層２６とを有する。負極電極２１は、一対の長辺に沿う縁部のうちの一方の縁部に第１縁部２１ａを備える。負極電極２１は、第１縁部２１ａの一部から突出した形状の負極タブ２７を有する。負極タブ２７は、負極活物質層２６が存在せず、負極金属箔２５そのもので構成されている。 The negative electrode electrode 21 has a negative electrode metal foil (for example, a copper foil) 25 as a current collector in the shape of a rectangular sheet, and a negative electrode active material layer 26 existing on both sides of the negative electrode metal foil 25. The negative electrode electrode 21 includes a first edge portion 21a on one edge portion of the edge portions along the pair of long sides. The negative electrode electrode 21 has a negative electrode tab 27 having a shape protruding from a part of the first edge portion 21a. The negative electrode tab 27 does not have the negative electrode active material layer 26 and is composed of the negative electrode metal foil 25 itself.

また、負極電極２１は、一対の長辺に沿う縁部のうちの第１縁部２１ａの対辺となる他方の縁部に第２縁部２１ｂを備える。さらに、負極電極２１は、第１縁部２１ａと第２縁部２１ｂ同士を繋ぐ一対の短辺に沿う縁部のうちの一方の縁部に第３縁部２１ｃを備え、第３縁部２１ｃの対辺となる他方の縁部に第４縁部２１ｄを備える。 Further, the negative electrode electrode 21 includes a second edge portion 21b on the other edge portion which is the opposite side of the first edge portion 21a among the edge portions along the pair of long sides. Further, the negative electrode electrode 21 includes a third edge portion 21c on one edge portion of one of the edge portions along the pair of short sides connecting the first edge portion 21a and the second edge portion 21b, and the third edge portion 21c. A fourth edge portion 21d is provided on the other edge portion which is the opposite side of the above.

図４（ａ）に示すように、負極電極２１の第１縁部２１ａの長さは、正極電極２０の第１縁部２０ａの長さより長く、負極電極２１の第２縁部２１ｂの長さは、正極電極２０の第２縁部２０ｂの長さより長い。さらに、負極電極２１の第３縁部２１ｃの長さは、正極電極２０の第３縁部２０ｃの長さより長く、負極電極２１の第４縁部２１ｄの長さは、正極電極２０の第４縁部２０ｄの長さより長い。よって、負極電極２１の外形は、正極電極２０の外形より一回り大きい。負極電極２１は、正極電極２０及び負極電極２１を積層した状態で正極電極２０の外形からはみ出すはみ出し部２８を第１〜第４縁部２１ａ〜２１ｄに沿って備える。 As shown in FIG. 4A, the length of the first edge portion 21a of the negative electrode electrode 21 is longer than the length of the first edge portion 20a of the positive electrode electrode 20, and the length of the second edge portion 21b of the negative electrode electrode 21. Is longer than the length of the second edge 20b of the positive electrode 20. Further, the length of the third edge portion 21c of the negative electrode electrode 21 is longer than the length of the third edge portion 20c of the positive electrode electrode 20, and the length of the fourth edge portion 21d of the negative electrode electrode 21 is the length of the fourth edge portion 21d of the positive electrode electrode 20. It is longer than the length of the edge 20d. Therefore, the outer shape of the negative electrode 21 is one size larger than the outer shape of the positive electrode 20. The negative electrode electrode 21 includes protruding portions 28 protruding from the outer shape of the positive electrode 20 in a state where the positive electrode 20 and the negative electrode 21 are laminated, along the first to fourth edge portions 21a to 21d.

図１に示すように、各正極電極２０は、それぞれの正極タブ２４が電極組立体１２の積層方向に沿って列状に配置されるように積層される。同様に、各負極電極２１は、それぞれの負極タブ２７が、正極タブ２４と重ならないように電極組立体１２の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、各正極タブ２４は、電極組立体１２における積層方向の一端から他端までの範囲に集められて正極タブ群２４ａとされる。正極タブ群２４ａには、正極端子１５が電気的に接合される。また、各負極タブ２７も同様に、電極組立体１２における積層方向の一端から他端までの範囲に集められて負極タブ群２７ａとされる。負極タブ群２７ａには、負極端子１６が電気的に接続される。 As shown in FIG. 1, the positive electrode electrodes 20 are laminated so that the positive electrode tabs 24 are arranged in a row along the stacking direction of the electrode assembly 12. Similarly, the negative electrode electrodes 21 are laminated so that the negative electrode tabs 27 are arranged in a row along the stacking direction of the electrode assembly 12 so that the negative electrode tabs 27 do not overlap with the positive electrode tabs 24. Then, each positive electrode tab 24 is collected in a range from one end to the other end in the stacking direction in the electrode assembly 12 to form a positive electrode tab group 24a. The positive electrode terminal 15 is electrically joined to the positive electrode tab group 24a. Similarly, each negative electrode tab 27 is also gathered in the range from one end to the other end in the stacking direction in the electrode assembly 12 to form a negative electrode tab group 27a. The negative electrode terminal 16 is electrically connected to the negative electrode tab group 27a.

電極組立体１２は、蓋１４に対向した端面に正極タブ群２４ａ及び負極タブ群２７ａが存在するタブ側端面１２ａを備え、ケース本体１３の底面１３ｂに対向した端面に底側端面１２ｂを備える。タブ側端面１２ａは、積層された負極電極２１の第１縁部２１ａによって構成され、底側端面１２ｂは、積層された負極電極２１の第２縁部２１ｂによって構成されている。また、電極組立体１２は、ケース本体１３の第１壁部１３ｃに対向した端面に第１側面１２ｃを備え、ケース本体１３の第２壁部１３ｄに対向した端面に第２側面１２ｄを備える。第１側面１２ｃは、積層方向の一端に位置する負極電極２１によって形成され、第２側面１２ｄは、積層方向の他端に位置する負極電極２１によって形成される。また、電極組立体１２は、ケース本体１３の第３壁部１３ｅに対向した端面に第３側面１２ｅを備え、ケース本体１３の第４壁部１３ｆに対向した端面に第４側面１２ｆを備える。第３側面１２ｅは、積層された負極電極２１の第３縁部２１ｃによって構成され、第４側面１２ｆは、積層された負極電極２１の第４縁部２１ｄによって構成されている。二次電池１０の容量は、ケース１１内に収容される電極組立体１２の容積が大きいほど大きくなる。このため、本実施形態では、積層する正極電極２０及び負極電極２１の枚数を極力増やすことで、ケース１１内に収容される電極組立体１２の容積を大きくしている。よって、第１及び第２側面１２ｃ，１２ｄとケース本体１３の内面との距離は、底側端面１２ｂや第３及び第４側面１２ｅ，１２ｆとケース本体１３の内面との距離に比べて短い。また、本実施形態では、正極電極２０及び負極電極２１の面方向への積層ずれはないものと考える。 The electrode assembly 12 includes a tab-side end surface 12a in which a positive electrode tab group 24a and a negative electrode tab group 27a are present on an end surface facing the lid 14, and a bottom-side end surface 12b on an end surface facing the bottom surface 13b of the case body 13. The tab side end surface 12a is composed of the first edge portion 21a of the laminated negative electrode electrodes 21, and the bottom side end surface 12b is composed of the second edge portion 21b of the laminated negative electrode electrodes 21. Further, the electrode assembly 12 includes a first side surface 12c on the end surface of the case body 13 facing the first wall portion 13c, and a second side surface 12d on the end surface of the case body 13 facing the second wall portion 13d. The first side surface 12c is formed by the negative electrode 21 located at one end in the stacking direction, and the second side surface 12d is formed by the negative electrode 21 located at the other end in the stacking direction. Further, the electrode assembly 12 includes a third side surface 12e on the end surface of the case body 13 facing the third wall portion 13e, and a fourth side surface 12f on the end surface of the case body 13 facing the fourth wall portion 13f. The third side surface 12e is composed of the third edge portion 21c of the laminated negative electrode 21, and the fourth side surface 12f is composed of the fourth edge portion 21d of the laminated negative electrode 21. The capacity of the secondary battery 10 increases as the volume of the electrode assembly 12 housed in the case 11 increases. Therefore, in the present embodiment, the volume of the electrode assembly 12 housed in the case 11 is increased by increasing the number of the positive electrode 20 and the negative electrode 21 to be laminated as much as possible. Therefore, the distance between the first and second side surfaces 12c and 12d and the inner surface of the case body 13 is shorter than the distance between the bottom end surface 12b and the third and fourth side surfaces 12e and 12f and the inner surface of the case body 13. Further, in the present embodiment, it is considered that there is no stacking deviation of the positive electrode 20 and the negative electrode 21 in the plane direction.

図４（ａ）及び図４（ｂ）に示すように、電極組立体１２は、第１側面１２ｃ及び第２側面１２ｄに、第１領域としての第１重合領域Ａ１と、第２領域としての第２重合領域Ａ２とを備える。第１重合領域Ａ１は、電極組立体１２を積層方向から見た側面視で、全ての正極電極２０及び負極電極２１が対向する対向部が投影された領域であり、正極電極２０の正極タブ２４を除いた部分と同じ大きさである。第２重合領域Ａ２は、電極組立体１２を積層方向から見た側面視で、第１重合領域Ａ１よりも外側に存在する領域であり、負極電極２１のはみ出し部２８が投影された領域である。第１重合領域Ａ１と第２重合領域Ａ２の境界部Ｂ、すなわち第１重合領域Ａ１の縁部は、電極組立体１２を積層方向から見た側面視で、正極電極２０の第１〜第４縁部２０ａ〜２０ｄと一致する。 As shown in FIGS. 4A and 4B, the electrode assembly 12 has a first polymerization region A1 as a first region and a second polymerization region A1 as a second region on the first side surface 12c and the second side surface 12d. It includes a second polymerization region A2. The first polymerization region A1 is a region in which the facing portions facing each other of the positive electrode 20 and the negative electrode 21 are projected when the electrode assembly 12 is viewed from the side in the stacking direction, and the positive electrode tab 24 of the positive electrode 20 is projected. It is the same size as the part excluding. The second polymerization region A2 is a region existing outside the first polymerization region A1 when the electrode assembly 12 is viewed from the stacking direction, and is a region on which the protruding portion 28 of the negative electrode electrode 21 is projected. .. The boundary portion B between the first polymerization region A1 and the second polymerization region A2, that is, the edge portion of the first polymerization region A1, is the first to fourth positive electrodes 20 in a side view of the electrode assembly 12 as viewed from the stacking direction. It coincides with the edges 20a to 20d.

二次電池１０は、電極組立体１２を覆う絶縁シートとしての絶縁フィルム４０を備える。絶縁フィルム４０は、電極組立体１２と金属製のケース本体１３とを絶縁する。絶縁フィルム４０は、例えばポリプロピレン（ＰＰ）製である。絶縁フィルム４０は、１枚の絶縁フィルムを折り畳み、かつ溶着して袋状に形成されている。絶縁フィルム４０は、電極組立体１２のタブ側端面１２ａを除く５面（底側端面１２ｂ及び第１〜第４側面１２ｃ〜１２ｄ）を覆っている。 The secondary battery 10 includes an insulating film 40 as an insulating sheet that covers the electrode assembly 12. The insulating film 40 insulates the electrode assembly 12 and the metal case body 13. The insulating film 40 is made of polypropylene (PP), for example. The insulating film 40 is formed in a bag shape by folding and welding one insulating film. The insulating film 40 covers five surfaces (bottom side end surface 12b and first to fourth side surfaces 12c to 12d) excluding the tab side end surface 12a of the electrode assembly 12.

二次電池１０は、境界部Ｂにおいて、電極組立体１２の第１側面１２ｃ及び第２側面１２ｄと絶縁フィルム４０との間に異物が入り込むことを規制する規制部材としての規制テープ５０を備える。本実施形態の規制テープ５０は、絶縁フィルム４０と同じポリプロピレン（ＰＰ）製であり、片面に粘着性を有する。規制テープ５０は、境界部Ｂを覆うように電極組立体１２に対して貼着されている。電極組立体１２を積層方向から見た側面視で、規制テープ５０は境界部Ｂに沿って存在する。規制テープ５０は、矩形状の輪をなす。規制テープ５０の内縁部５０ａは、第１重合領域Ａ１に存在し、外縁部５０ｂは、第２重合領域Ａ２に存在する。 The secondary battery 10 includes a regulating tape 50 as a regulating member that regulates foreign matter from entering between the first side surface 12c and the second side surface 12d of the electrode assembly 12 and the insulating film 40 at the boundary portion B. The regulation tape 50 of this embodiment is made of polypropylene (PP), which is the same as the insulating film 40, and has adhesiveness on one side. The regulation tape 50 is attached to the electrode assembly 12 so as to cover the boundary portion B. The regulation tape 50 exists along the boundary portion B when the electrode assembly 12 is viewed from the side in the laminating direction. The regulation tape 50 forms a rectangular ring. The inner edge portion 50a of the regulation tape 50 exists in the first polymerization region A1, and the outer edge portion 50b exists in the second polymerization region A2.

図２に示すように、このような二次電池１０は、充放電時の正極電極２０及び負極電極２１の積層方向への膨張によるケース１１の変形を抑制すべく、拘束治具７０によって積層方向に拘束される。例えば、拘束治具７０は、一対の拘束板７１，７２と、それら拘束板７１，７２を連結するボルト７３と、ボルト７３に螺合されるナット７４と、を有する。一方の拘束板７１は、ケース本体１３の第１壁部１３ｃと対向配置され、他方の拘束板７２は、ケース本体１３の第２壁部１３ｄと対向配置される。そして、ボルト７３にナット７４を螺合することで、ケース本体１３の第１壁部１３ｃ及び第２壁部１３ｄは、拘束板７１，７２から荷重が加えられ、電極組立体１２の積層方向に拘束される。 As shown in FIG. 2, such a secondary battery 10 is stacked in the stacking direction by a restraining jig 70 in order to suppress deformation of the case 11 due to expansion of the positive electrode 20 and the negative electrode 21 in the stacking direction during charging / discharging. Be bound by. For example, the restraint jig 70 has a pair of restraint plates 71 and 72, a bolt 73 connecting the restraint plates 71 and 72, and a nut 74 screwed into the bolt 73. One restraint plate 71 is arranged to face the first wall portion 13c of the case body 13, and the other restraint plate 72 is arranged to face the second wall portion 13d of the case body 13. Then, by screwing the nut 74 into the bolt 73, a load is applied to the first wall portion 13c and the second wall portion 13d of the case body 13 from the restraint plates 71 and 72, and the load is applied from the restraint plates 71 and 72 in the stacking direction of the electrode assembly 12. Be restrained.

第１重合領域Ａ１は、全ての正極電極２０及び負極電極２１が重なった領域であるため、充放電時の電極組立体１２の積層方向への膨張に伴い、加圧状態となる。このとき、規制テープ５０は、絶縁フィルム４０に食い込んだ状態となる。このため、第１重合領域Ａ１では、電極組立体１２の第１及び第２側面１２ｃ，１２ｄと絶縁フィルム４０との間や、絶縁フィルム４０とケース本体１３の第１及び第２壁部１３ｃ，１３ｄの内面との間への異物の侵入は抑制される。一方、第２重合領域Ａ２は、負極電極２１のはみ出し部２８が積層された領域であり、はみ出し部２８同士の間には正極電極２０の厚み分だけ隙間がある。はみ出し部２８の積層方向への膨張の一部は、この隙間によって吸収される。このため、第２重合領域Ａ２は非加圧状態である。第２重合領域Ａ２では、電極組立体１２の第１及び第２側面１２ｃ，１２ｄと絶縁フィルム４０との間や、絶縁フィルム４０とケース本体１３の第１及び第２壁部１３ｃ，１３ｄの内面との間には隙間ができやすい。境界部Ｂでは、規制テープ５０が電極組立体１２の第１及び第２側面１２ｃ，１２ｄと絶縁フィルム４０との間に埋められた状態にある。 Since the first polymerization region A1 is a region in which all the positive electrode 20 and the negative electrode 21 overlap, the electrode assembly 12 is expanded in the stacking direction during charging and discharging, and is in a pressurized state. At this time, the regulation tape 50 is in a state of biting into the insulating film 40. Therefore, in the first polymerization region A1, between the first and second side surfaces 12c and 12d of the electrode assembly 12 and the insulating film 40, and between the insulating film 40 and the first and second wall portions 13c of the case body 13, The invasion of foreign matter into the inner surface of 13d is suppressed. On the other hand, the second polymerization region A2 is a region in which the protruding portions 28 of the negative electrode electrodes 21 are laminated, and there is a gap between the protruding portions 28 by the thickness of the positive electrode 20. A part of the expansion of the protruding portion 28 in the stacking direction is absorbed by this gap. Therefore, the second polymerization region A2 is in a non-pressurized state. In the second polymerization region A2, between the first and second side surfaces 12c and 12d of the electrode assembly 12 and the insulating film 40, and between the insulating film 40 and the inner surfaces of the first and second wall portions 13c and 13d of the case body 13. It is easy to create a gap between the two. At the boundary portion B, the regulation tape 50 is embedded between the first and second side surfaces 12c and 12d of the electrode assembly 12 and the insulating film 40.

次に、第１の実施形態の効果を作用とともに記載する。
（１）二次電池１０が規制テープ５０を備えない場合、ケース１１内に混入した異物が、第２重合領域Ａ２において電極組立体１２の第１及び第２側面１２ｃ，１２ｄの内面と絶縁フィルム４０との隙間に侵入し、境界部Ｂにおいて第１及び第２側面１２ｃ，１２ｄと絶縁フィルム４０との間で挟まることがある。これに対し、本実施形態では、規制テープ５０が境界部Ｂを覆うように配置されているため、境界部Ｂにおいて電極組立体１２の第１及び第２側面１２ｃ，１２ｄと絶縁フィルム４０との間に異物が挟まることが規制される。 Next, the effects of the first embodiment will be described together with the actions.
(1) When the secondary battery 10 does not include the regulation tape 50, foreign matter mixed in the case 11 is present on the inner surfaces of the first and second side surfaces 12c and 12d of the electrode assembly 12 and the insulating film in the second polymerization region A2. It may enter the gap with the 40 and be sandwiched between the first and second side surfaces 12c and 12d and the insulating film 40 at the boundary portion B. On the other hand, in the present embodiment, since the regulation tape 50 is arranged so as to cover the boundary portion B, the first and second side surfaces 12c and 12d of the electrode assembly 12 and the insulating film 40 are arranged at the boundary portion B. It is regulated that foreign matter is caught between them.

（２）電極組立体１２の第１及び第２側面１２ｃ，１２ｄと絶縁フィルム４０との間に規制テープ５０を配置する。これにより、絶縁フィルム４０とケース本体１３との間に規制テープ５０を配置する場合よりも、規制テープ５０を電極組立体１２近傍に配置できるため、境界部Ｂの位置を把握しやすい。よって、規制テープ５０を電極組立体１２の境界部Ｂに対して容易に貼着できる。 (2) The regulation tape 50 is arranged between the first and second side surfaces 12c and 12d of the electrode assembly 12 and the insulating film 40. As a result, the regulation tape 50 can be arranged in the vicinity of the electrode assembly 12 as compared with the case where the regulation tape 50 is arranged between the insulating film 40 and the case body 13, so that the position of the boundary portion B can be easily grasped. Therefore, the regulation tape 50 can be easily attached to the boundary portion B of the electrode assembly 12.

（３）規制テープ５０は、片面に粘着性を有するため、電極組立体１２に対して貼着でき、規制部材を容易に配置できる。
（第２の実施形態）
以下、蓄電装置を二次電池に具体化した第２の実施形態を図５にしたがって説明する。 (3) Since the regulation tape 50 has adhesiveness on one side, it can be attached to the electrode assembly 12, and the regulation member can be easily arranged.
(Second Embodiment)
Hereinafter, a second embodiment in which the power storage device is embodied in a secondary battery will be described with reference to FIG.

図５（ａ）及び図５（ｂ）に示すように、二次電池８０は、ケース１１を備える。なお、ケース１１については、上記実施形態と同構成であるため説明を省略する。二次電池８０は、ケース１１に収容された電極組立体８２及び電解液（図示せず）を備える。本実施形態の電極組立体８２は、第１の電極としての長尺帯状の正極電極９０と、第２の電極としての長尺帯状の負極電極９１とを、長尺帯状のセパレータ（図示せず）を介在させて絶縁した状態で積層し、偏平状に巻回した巻回型の電極組立体である。電極組立体８２は、巻回軸線Ｌが蓋１４の長手方向と一致するようにケース１１に収容されている。電極組立体８２は、ケース本体１３の第１壁部１３ｃの内面と対向する外側面に偏平面としての第１偏平面８３を備え、第２壁部１３ｄの内面と対向する外側面に偏平面としての第２偏平面８４を備える。また、電極組立体８２は、第１偏平面８３及び第２偏平面８４を繋ぐ外側面に円弧面８５を備える。電極組立体８２は、第１偏平面８３及び第２偏平面８４の縁部のうち巻回軸線Ｌに沿う縁部８３ａ，８４ａを備える。 As shown in FIGS. 5A and 5B, the secondary battery 80 includes a case 11. Since the case 11 has the same configuration as that of the above embodiment, the description thereof will be omitted. The secondary battery 80 includes an electrode assembly 82 housed in a case 11 and an electrolytic solution (not shown). In the electrode assembly 82 of the present embodiment, the long strip-shaped positive electrode 90 as the first electrode and the long strip-shaped negative electrode 91 as the second electrode are separated by a long strip-shaped separator (not shown). ) Is interposed and laminated in an insulated state, and wound in a flat shape. This is a winding type electrode assembly. The electrode assembly 82 is housed in the case 11 so that the winding axis L coincides with the longitudinal direction of the lid 14. The electrode assembly 82 includes a first eccentric plane 83 as an eccentric plane on the outer surface of the case body 13 facing the inner surface of the first wall portion 13c, and an eccentric plane on the outer surface of the second wall portion 13d facing the inner surface. A second eccentric plane 84 is provided. Further, the electrode assembly 82 includes an arcuate surface 85 on the outer surface connecting the first eccentric plane 83 and the second eccentric plane 84. The electrode assembly 82 includes edges 83a and 84a along the winding axis L among the edges of the first eccentric plane 83 and the second eccentric plane 84.

二次電池８０は、電極組立体８２の外側面を覆う絶縁シートとしての絶縁フィルム８６を備える。また、二次電池８０は、第１及び第２偏平面８３，８４の縁部８３ａ，８４ａにおいて、絶縁フィルム８６とケース本体１３の第１壁部１３ｃ及び第２壁部１３ｄの内面との間に異物が挟まることを規制する規制テープ８７を備える。規制テープ８７は、絶縁フィルム８６によって覆われた第１偏平面８３及び第２偏平面８４の縁部８３ａ，８４ａを覆うように配置されている。電極組立体８２を第１及び第２偏平面８３，８４と直交する方向から見た側面視で、規制テープ８７は、縁部８３ａ，８４ａに沿って存在する。 The secondary battery 80 includes an insulating film 86 as an insulating sheet that covers the outer surface of the electrode assembly 82. Further, the secondary battery 80 is provided between the insulating film 86 and the inner surfaces of the first wall portion 13c and the second wall portion 13d of the case body 13 at the edges 83a and 84a of the first and second eccentric planes 83 and 84. A regulation tape 87 for restricting foreign matter from being caught in the battery is provided. The regulation tape 87 is arranged so as to cover the edges 83a and 84a of the first eccentric plane 83 and the second eccentric plane 84 covered by the insulating film 86. The regulation tape 87 exists along the edges 83a, 84a in a side view of the electrode assembly 82 viewed from a direction orthogonal to the first and second planes 83, 84.

このような巻回型の電極組立体８２を備える二次電池８０は、第１の実施形態と同様、拘束治具によって拘束された状態で充放電が行われる。すなわち、ケース１１の第１壁部１３ｃと第２壁部１３ｄは、第１及び第２偏平面８３，８４と直交する方向に拘束される。 The secondary battery 80 including the winding type electrode assembly 82 is charged and discharged in a state of being restrained by a restraining jig as in the first embodiment. That is, the first wall portion 13c and the second wall portion 13d of the case 11 are constrained in a direction orthogonal to the first and second planes 83 and 84.

第１及び第２偏平面８３，８４は、充放電時の電極組立体８２の積層方向への膨張に伴い、加圧状態となるため、第１及び第２偏平面８３，８４と絶縁フィルム８６との間や、絶縁フィルム８６とケース本体１３の第１及び第２壁部１３ｃ，１３ｄの内面との間への異物の侵入が抑制される。第１及び第２偏平面８３，８４の縁部８３ａ，８４ａに対向した絶縁フィルム８６とケース本体１３の第１及び第２壁部１３ｃ，１３ｄの内面との距離は、第１及び第２偏平面８３，８４に対向した絶縁フィルム８６とケース本体１３の第１及び第２壁部１３ｃ，１３ｄの内面との距離よりも長い。規制テープ８７は、第１及び第２偏平面８３，８４の縁部８３ａ，８４ａに対面する絶縁フィルム８６とケース本体１３の第１及び第２壁部１３ｃ，１３ｄの内面との間に埋められた状態にある。 Since the first and second eccentric planes 83 and 84 are in a pressurized state as the electrode assembly 82 expands in the stacking direction during charging and discharging, the first and second eccentric planes 83 and 84 and the insulating film 86 Foreign matter is suppressed from entering between the insulating film 86 and the inner surfaces of the first and second wall portions 13c and 13d of the case body 13. The distances between the insulating film 86 facing the edges 83a and 84a of the first and second eccentric planes 83 and 84 and the inner surfaces of the first and second wall portions 13c and 13d of the case body 13 are the first and second deviations. It is longer than the distance between the insulating film 86 facing the planes 83 and 84 and the inner surfaces of the first and second wall portions 13c and 13d of the case body 13. The regulation tape 87 is embedded between the insulating film 86 facing the edges 83a and 84a of the first and second planes 83 and 84 and the inner surfaces of the first and second wall portions 13c and 13d of the case body 13. Is in a state of being.

次に、第２の実施形態の効果を作用とともに記載する。
（４）二次電池８０が規制テープ８７を備えない場合、ケース１１内に混入した異物は、第１及び第２偏平面８３，８４の縁部８３ａ，８４ａにおいて、絶縁フィルム８６とケース本体１３の第１及び第２壁部１３ｃ，１３ｄの内面との間で挟まることがある。これに対し、本実施形態の二次電池８０は、電極組立体８２を第１及び第２偏平面８３，８４と直交する方向から見た側面視で、縁部８３ａ，８４ａに沿って配置された規制テープ８７を備える。よって、縁部８３ａ，８４ａにおいて、絶縁フィルム８６とケース本体１３の第１及び第２壁部１３ｃ，１３ｄの内面との間に異物が挟まることが規制される。 Next, the effects of the second embodiment will be described together with the actions.
(4) When the secondary battery 80 does not include the regulation tape 87, the foreign matter mixed in the case 11 is the insulating film 86 and the case body 13 at the edges 83a and 84a of the first and second eccentric planes 83 and 84. It may be sandwiched between the inner surfaces of the first and second wall portions 13c and 13d. On the other hand, the secondary battery 80 of the present embodiment is arranged along the edge portions 83a, 84a in a side view of the electrode assembly 82 viewed from a direction orthogonal to the first and second eccentric planes 83, 84. The regulation tape 87 is provided. Therefore, it is restricted that foreign matter is caught between the insulating film 86 and the inner surfaces of the first and second wall portions 13c and 13d of the case body 13 at the edge portions 83a and 84a.

なお、第１の実施形態及び第２の実施形態は、以下のように変更してもよい。
○ 集電体は、正極活物質層２３や負極活物質層２６が形成できるものであれば、正極金属箔２２や負極金属箔２５に限定されるものではない。例えば、織物状や網状のシートを用いてもよい。 The first embodiment and the second embodiment may be changed as follows.
○ The current collector is not limited to the positive electrode metal foil 22 and the negative electrode metal foil 25 as long as the positive electrode active material layer 23 and the negative electrode active material layer 26 can be formed. For example, a woven or net-like sheet may be used.

○ 正極電極２０は、正極金属箔２２の片面に正極活物質層２３が存在する構造でもよい。同様に、負極電極２１は、負極金属箔２５の片面に負極活物質層２６が存在する構成でもよい。 ○ The positive electrode electrode 20 may have a structure in which the positive electrode active material layer 23 exists on one side of the positive electrode metal foil 22. Similarly, the negative electrode electrode 21 may have a configuration in which the negative electrode active material layer 26 is present on one side of the negative electrode metal foil 25.

○ 第１の実施形態において、第１の電極を負極電極２１、第２の電極を正極電極２０にしてもよい。この場合、第２重合領域Ａ２は、電極組立体１２を積層方向から見た側面視で、負極電極２１の外形からはみ出した正極電極２０のはみ出し部が投影された領域となる。同様に、第２の実施形態において、第１の電極を負極電極９１、第２の電極を正極電極９０にしてもよい。 ○ In the first embodiment, the first electrode may be the negative electrode 21 and the second electrode may be the positive electrode 20. In this case, the second polymerization region A2 is a region in which the protruding portion of the positive electrode 20 protruding from the outer shape of the negative electrode 21 is projected when the electrode assembly 12 is viewed from the side in the stacking direction. Similarly, in the second embodiment, the first electrode may be the negative electrode 91 and the second electrode may be the positive electrode 90.

○ 第１の実施形態では、正極電極２０及び負極電極２１の面方向への積層ずれは無いものとして説明したため、境界部Ｂは、電極組立体１２を積層方向から見た側面視で、正極電極２０の第１〜第４縁部２０ａ〜２０ｄと一致していた。しかしながら、正極電極２０及び負極電極２１に面方向への積層ずれがある場合、境界部Ｂは、全ての正極電極２０及び負極電極２１が対向する対向部が投影された第１重合領域Ａ１の縁部となり、正極電極２０の第１〜第４縁部２０ａ〜２０ｄと一致しない。 ○ In the first embodiment, it has been described that the positive electrode 20 and the negative electrode 21 are not misaligned in the plane direction. Therefore, the boundary portion B is the positive electrode when the electrode assembly 12 is viewed from the side in the stacking direction. It coincided with the first to fourth edges 20a to 20d of 20. However, when the positive electrode 20 and the negative electrode 21 have a stacking deviation in the plane direction, the boundary portion B is the edge of the first polymerization region A1 on which the facing portions facing each other of the positive electrode 20 and the negative electrode 21 are projected. It becomes a portion and does not coincide with the first to fourth edge portions 20a to 20d of the positive electrode electrode 20.

○ 絶縁シートの種類は、絶縁フィルム４０，８６に限定されず、ラミネートシートであってもよい。
○ 絶縁フィルム４０，８６の材料は、ポリプロピレン（ＰＰ）に限定されず、ポリフェニレンサルファイド（ＰＰＳ）など他の材料でもよい。 ○ The type of the insulating sheet is not limited to the insulating films 40 and 86, and may be a laminated sheet.
○ The material of the insulating films 40 and 86 is not limited to polypropylene (PP), and other materials such as polyphenylene sulfide (PPS) may be used.

○ 第１及び第２の実施形態の規制部材は、片面に粘着性を有する規制テープ５０，８７であったが、両面に粘着性を有するテープでもよいし、粘着性を有さないシート状の部材でもよい。また、規制テープ５０，８７の材料は、絶縁フィルム４０，８６の材料と異なっていてもよい。 ○ The regulating members of the first and second embodiments were the regulating tapes 50 and 87 having adhesiveness on one side, but tapes having adhesiveness on both sides may be used, or a sheet having no adhesiveness. It may be a member. Further, the material of the regulation tapes 50 and 87 may be different from the material of the insulating films 40 and 86.

○ 第１の実施形態では、規制テープ５０を電極組立体１２の第１及び第２側面１２ｃ，１２ｄに対して貼着していたが、絶縁フィルム４０の内側面に貼着してもよい。ただし、電極組立体１２を積層方向から見た側面視で、境界部Ｂに沿うように規制テープ５０を配置する。 -In the first embodiment, the regulation tape 50 is attached to the first and second side surfaces 12c and 12d of the electrode assembly 12, but it may be attached to the inner side surface of the insulating film 40. However, the regulation tape 50 is arranged along the boundary portion B when the electrode assembly 12 is viewed from the side in the stacking direction.

○ 図６に示すように、第１の実施形態の規制テープ５０は、絶縁フィルム４０の外側面とケース本体１３の第１壁部１３ｃ及び第２壁部１３ｄの内面との間に配置されてもよい。ただし、二次電池１０を積層方向から見た側面視で、規制テープ５０が境界部Ｂに沿うように配置する。なお、規制テープ５０は、絶縁フィルム４０の外側面に貼着してもよいし、ケース本体１３の第１壁部１３ｃ及び第２壁部１３ｄの内面に貼着してもよい。 ○ As shown in FIG. 6, the regulation tape 50 of the first embodiment is arranged between the outer surface of the insulating film 40 and the inner surface of the first wall portion 13c and the second wall portion 13d of the case body 13. May be good. However, the regulation tape 50 is arranged along the boundary portion B when the secondary battery 10 is viewed from the side when viewed from the stacking direction. The regulation tape 50 may be attached to the outer surface of the insulating film 40, or may be attached to the inner surfaces of the first wall portion 13c and the second wall portion 13d of the case body 13.

○ 第２の実施形態の規制テープ８７は、電極組立体８２の外側面と絶縁フィルム８６の内側面との間に配置されてもよい。ただし、二次電池８０を第１及び第２偏平面８３，８４と直交する方向から見た側面視で、規制テープ８７が第１及び第２偏平面８３，８４の縁部８３ａ，８４ａに沿うように配置する。なお、規制テープ８７は、電極組立体８２の外側面に貼着してもよいし、絶縁フィルム４０の内側面に貼着してもよい。 The regulation tape 87 of the second embodiment may be arranged between the outer surface of the electrode assembly 82 and the inner surface of the insulating film 86. However, when the secondary battery 80 is viewed from the side orthogonal to the first and second eccentric planes 83 and 84, the regulation tape 87 is along the edges 83a and 84a of the first and second eccentric planes 83 and 84. Arrange as follows. The regulation tape 87 may be attached to the outer surface of the electrode assembly 82, or may be attached to the inner surface of the insulating film 40.

○ 第１の実施形態の規制テープ５０は、積層方向から見た側面視で、境界部Ｂの一部に沿って存在してもよい。同様に、第２の実施形態の規制テープ８７は、第１及び第２偏平面８３，８４の縁部８３ａ，８４ａの一部に沿って存在してもよい。 ○ The regulation tape 50 of the first embodiment may exist along a part of the boundary portion B in a side view seen from the stacking direction. Similarly, the regulatory tape 87 of the second embodiment may be present along a portion of the edges 83a, 84a of the first and second planes 83,84.

電極組立体１２をケース本体１３に収容した後にケース１１内に混入した異物は、重力によって落下し、電極組立体１２，８２と絶縁フィルム４０，８６との間や、絶縁フィルム４０，８６とケース本体１３との間に挟まりやすい。よって、境界部Ｂや縁部８３ａ，８４ａのうち蓋１４側に位置する部分に沿って規制テープ５０，８７を配置することが好ましい。 Foreign matter mixed in the case 11 after the electrode assembly 12 is housed in the case body 13 falls due to gravity, and is between the electrode assemblies 12, 82 and the insulating films 40, 86, or between the insulating films 40, 86 and the case. It is easy to get caught between the main body 13. Therefore, it is preferable to arrange the regulation tapes 50 and 87 along the portion of the boundary portion B and the edge portions 83a and 84a located on the lid 14 side.

○ 図７に示すように、境界部Ｂに加えて第１重合領域Ａ１全体を覆うように矩形状の規制テープ５０を貼着してもよい。
○ 複数枚の絶縁フィルム４０によって電極組立体１２を覆う構成としてもよい。 ○ As shown in FIG. 7, a rectangular regulating tape 50 may be attached so as to cover the entire first polymerization region A1 in addition to the boundary portion B.
O The electrode assembly 12 may be covered with a plurality of insulating films 40.

○ 第１の実施形態において、絶縁フィルム４０を袋状に形成する方法は、溶着に限定されない。例えば、絶縁フィルム４０によって電極組立体１２を覆った後、電極組立体１２からはみ出した部分を、電極組立体１２を覆っている部分に重ねてテープで貼り付けてもよい。また、他の方法として、電極組立体１２より一回り大きい袋状の絶縁フィルム４０の中に電極組立体１２を収納し、その後で絶縁フィルム４０を熱収縮させることで電極組立体１２と絶縁フィルム４０とを密着させてもよい。 ○ In the first embodiment, the method of forming the insulating film 40 in a bag shape is not limited to welding. For example, after covering the electrode assembly 12 with the insulating film 40, the portion protruding from the electrode assembly 12 may be overlapped with the portion covering the electrode assembly 12 and attached with tape. As another method, the electrode assembly 12 is housed in a bag-shaped insulating film 40 that is one size larger than the electrode assembly 12, and then the insulating film 40 is heat-shrinked to obtain the electrode assembly 12 and the insulating film. It may be brought into close contact with 40.

○ 第１の実施形態の拘束治具７０は、１つの二次電池１０を拘束していたが、複数の二次電池１０をまとめて拘束してもよい。同様に、第２の実施形態の拘束治具は、１つの二次電池８０を拘束してもよいし、複数の二次電池８０を拘束してもよい。 -Although the restraint jig 70 of the first embodiment restrains one secondary battery 10, a plurality of secondary batteries 10 may be restrained together. Similarly, the restraint jig of the second embodiment may restrain one secondary battery 80 or may restrain a plurality of secondary batteries 80.

○ 二次電池１０，８０は、リチウムイオン二次電池でもよいし、他の二次電池であってもよい。要は、正極用の活物質と負極用の活物質との間をイオンが移動するとともに電荷の授受を行うものであればよい。 ○ The secondary batteries 10 and 80 may be lithium ion secondary batteries or other secondary batteries. In short, it suffices as long as the ions move between the active material for the positive electrode and the active material for the negative electrode and transfer charges.

○ 蓄電装置は、例えばキャパシタなど、二次電池以外の蓄電装置にも適用可能である。 ○ The power storage device can also be applied to a power storage device other than a secondary battery, such as a capacitor.

１０，８０…蓄電装置としての二次電池、１１…ケース、１２，８２…電極組立体、１２ｃ…端面としての第１側面、１２ｄ…端面としての第２側面、１３…ケース本体、１３ａ…開口部、１４…蓋、２０…第１の電極としての正極電極、２１…第２の電極としての負極電極、４０，８６…絶縁シートとしての絶縁フィルム、５０，８７…規制部材としての規制テープ、８３…偏平面としての第１偏平面、８４…偏平面としての第２偏平面、８３ａ，８４ａ…縁部、Ａ１…第１領域としての第１重合領域、Ａ２…第２領域としての第２重合領域、Ｂ…境界部。 10,80 ... Secondary battery as a power storage device, 11 ... Case, 12,82 ... Electrode assembly, 12c ... First side surface as end face, 12d ... Second side surface as end face, 13 ... Case body, 13a ... Opening Part, 14 ... lid, 20 ... positive electrode as first electrode, 21 ... negative electrode as second electrode, 40, 86 ... insulating film as insulating sheet, 50, 87 ... regulating tape as regulating member, 83 ... First eccentric plane as a eccentric plane, 84 ... Second eccentric plane as a eccentric plane, 83a, 84a ... Edges, A1 ... First polymerization region as a first region, A2 ... Second region as a second region Overlapping region, B ... Boundary.

Claims (4)

複数のシート状の第１の電極と、前記第１の電極と極性及び大きさの異なる複数のシート状の第２の電極とが絶縁された状態で交互に積層された電極組立体と、
前記電極組立体を覆う絶縁シートと、
前記絶縁シートによって覆われた前記電極組立体を収容するケースと、
を備えた蓄電装置であって、
前記第１の電極及び前記第２の電極は、矩形シート状の集電体と、該集電体の片面又は両面に存在する活物質層と、を有し、
前記電極組立体は、積層方向の端面に、全ての前記第１の電極の前記活物質層及び前記第２の電極の前記活物質層が対向する対向部が投影される第１領域と、前記第１領域よりも外側に位置して前記第２の電極の前記活物質層のみが投影される第２領域とを有し、
前記第２領域は、前記第１領域の全周に沿って存在しており、
前記端面と前記絶縁シートとの間、又は前記端面に対向した絶縁シートと前記ケースとの間に配置され、かつ前記積層方向から見た側面視で、前記第１領域と前記第２領域の境界部に沿って配置される規制部材を備え、
前記規制部材は、前記境界部の全周に沿い、かつ前記第１領域及び前記第２領域に跨る位置に配置されており、
前記規制部材の縁部が前記第２領域に存在することを特徴とする蓄電装置。 An electrode assembly in which a plurality of sheet-shaped first electrodes and a plurality of sheet-shaped second electrodes having different polarities and sizes are alternately laminated in an insulated state.
An insulating sheet covering the electrode assembly and
A case for accommodating the electrode assembly covered with the insulating sheet and
It is a power storage device equipped with
The first electrode and the second electrode have a rectangular sheet-shaped current collector and an active material layer existing on one side or both sides of the current collector.
The electrode assembly has a first region on which the active material layer of all the first electrodes and the facing portion facing the active material layer of the second electrode are projected on the end faces in the stacking direction, and the above. It has a second region located outside the first region and on which only the active material layer of the second electrode is projected .
The second region exists along the entire circumference of the first region.
The boundary between the first region and the second region when arranged between the end face and the insulating sheet or between the insulating sheet facing the end face and the case and viewed from the laminating direction. comprising a regulating member disposed along the section,
The regulating member is arranged at a position along the entire circumference of the boundary portion and straddling the first region and the second region.
A power storage device characterized in that an edge portion of the regulation member exists in the second region. 前記規制部材は、前記積層方向から見て輪をなすように設けられており、
前記規制部材の前記縁部のうち、外縁部が前記第２領域に存在し、内縁部が前記第１領域に存在する請求項１に記載の蓄電装置。 The regulating member is provided so as to form a ring when viewed from the stacking direction.
The power storage device according to claim 1, wherein the outer edge portion of the edge portion of the regulation member exists in the second region and the inner edge portion exists in the first region. 前記規制部材は、前記端面と前記絶縁シートとの間に配置されている請求項１又は請求項２に記載の蓄電装置。 The power storage device according to claim 1 or 2, wherein the regulating member is arranged between the end face and the insulating sheet. 前記規制部材は、テープである請求項１〜請求項３の何れか一項に記載の蓄電装置。 The power storage device according to any one of claims 1 to 3, wherein the regulating member is a tape.
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