JP2016115409A - Power storage element - Google Patents

Power storage element Download PDF

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JP2016115409A
JP2016115409A JP2014250609A JP2014250609A JP2016115409A JP 2016115409 A JP2016115409 A JP 2016115409A JP 2014250609 A JP2014250609 A JP 2014250609A JP 2014250609 A JP2014250609 A JP 2014250609A JP 2016115409 A JP2016115409 A JP 2016115409A
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current collecting
current
tab
electrode body
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JP6520097B2 (en
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謙志 河手
Kenji Kawate
謙志 河手
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GS Yuasa 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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  • Connection Of Batteries Or Terminals (AREA)
  • Electric Double-Layer Capacitors Or The Like (AREA)

Abstract

PROBLEM TO BE SOLVED: To achieve a high capacity power storage element by reducing the profile of an electrode body at the end thereof.SOLUTION: A power storage element (battery 1) includes an electrode body 20 housed in a case (exterior body) 10 while bending a collector tab 28 along the end. The power storage element also includes a collector 60A having a joint (welded part) 61A to which the collector tab 28 is joined, a connection (caulked part) connected with an external terminal 50A and provided adjacently in a direction crossing the projecting direction of the collector tab 28, and a release part 66A provided adjacently in the projecting direction of the collector tab 28. The bend 28c of the collector tab 28 is located in the release part 66A.SELECTED DRAWING: Figure 10

Description

本発明は、リチウムイオン二次電池のような非電解質二次電池を含む蓄電素子に関する。   The present invention relates to a storage element including a non-electrolyte secondary battery such as a lithium ion secondary battery.

特許文献１には、正極電極シートと負極電極シートとの間にセパレータを介在させて積層した電極体を備える蓄電素子が開示されている。電極体には、平面視で積層方向と直交する長辺方向に間隔をあけて正極集電タブと負極集電タブが突設され、各集電タブに集電体が溶接されている。集電体は、集電タブを溶接する第１部分と、第１部分より幅を広くした第２部分とを備える。   Patent Document 1 discloses a power storage element including an electrode body that is laminated with a separator interposed between a positive electrode sheet and a negative electrode sheet. A positive electrode current collection tab and a negative electrode current collection tab are projected from the electrode body at intervals in a long side direction orthogonal to the stacking direction in plan view, and the current collector is welded to each current collection tab. The current collector includes a first portion that welds the current collecting tab and a second portion that is wider than the first portion.

特許文献１の蓄電素子は、集電タブを突出させた電極体の端部での低背化について何も考慮されていない。そのため、同一高さの蓄電素子を製造する場合、電極体を小さくする必要があるため、電池容量が小さくなる。   In the electric storage element of Patent Document 1, no consideration is given to the reduction in height at the end of the electrode body from which the current collecting tab is projected. For this reason, when manufacturing an electric storage element having the same height, it is necessary to make the electrode body small, so that the battery capacity becomes small.

特許第５３２５７９６号公報Japanese Patent No. 5325796

本発明は、電極体端部での低背化を図り、電極体を大きくして蓄電素子の高容量化を図ることを課題とする。   It is an object of the present invention to reduce the height at the end of the electrode body and increase the capacity of the power storage device by enlarging the electrode body.

本発明は、正極電極シートと負極電極シートとをセパレータを介在させて交互に積層してなり、前記各電極シートの端部から突出する突部が互いに重ね合わされてなる正極集電タブ及び負極集電タブを有し、前記各集電タブが前記端部に沿って延びるように折り曲げられてケース内に収容された電極体と、前記ケースに配置された外部端子と、前記集電タブが接合された被接合部と、前記外部端子に接続されるとともに前記被接合部に対して前記集電タブが突出する方向と交差する方向に隣接して設けられた接続部と、前記被接合部の前記集電タブが突出する方向に隣接して設けられた逃がし部とを有し、前記逃がし部に前記集電タブの折曲部が位置する集電体とを備える、蓄電素子を提供する。   In the present invention, a positive electrode current collecting tab and a negative electrode current collecting sheet are formed by alternately laminating positive electrode sheets and negative electrode sheets with separators interposed therebetween, and protrusions protruding from end portions of the electrode sheets are overlapped with each other. An electrode body having an electric tab, wherein each of the current collecting tabs is bent so as to extend along the end, and is accommodated in the case, an external terminal disposed in the case, and the current collecting tab are joined together A connected portion that is connected to the external terminal and adjacent to a direction that intersects a direction in which the current collecting tab protrudes with respect to the bonded portion; and There is provided a power storage device comprising: an escape portion provided adjacent to a direction in which the current collection tab protrudes; and a current collector in which the bent portion of the current collection tab is positioned at the escape portion.

本発明の蓄電素子では、集電タブの折曲部が集電体の逃がし部に位置し、逃がし部に隣接して集電タブと溶接した被接合部が位置する。よって、電極体の端面側の低背化を図ることができ、電極体とケースとの間の距離を小さくすることができる。そのため、同一高さの蓄電素子を製造する場合、電極体を大きくすることができるため、高容量化を図ることができる。   In the electricity storage device of the present invention, the bent portion of the current collector tab is located at the escape portion of the current collector, and the joined portion welded to the current collector tab is located adjacent to the escape portion. Therefore, the height of the end face side of the electrode body can be reduced, and the distance between the electrode body and the case can be reduced. For this reason, in the case of manufacturing a power storage element having the same height, the electrode body can be enlarged, so that the capacity can be increased.

本発明に係る蓄電素子によれば、電極体の端部の低背化を図り、蓄電素子を高容量化できる。   According to the electricity storage device according to the present invention, it is possible to reduce the height of the end portion of the electrode body and increase the capacity of the electricity storage device.

本発明の第１実施形態に係る非電解質二次電池の縦断面図。1 is a longitudinal sectional view of a non-electrolyte secondary battery according to a first embodiment of the present invention. 図１の非電解質二次電池の分解斜視図。The disassembled perspective view of the non-electrolyte secondary battery of FIG. 電極体の斜視図。The perspective view of an electrode body. 電極体の展開図。The expanded view of an electrode body. 図１の部分Ｖの拡大図。The enlarged view of the part V of FIG. 図１の部分VIの拡大図。The enlarged view of the part VI of FIG. 電極体及び集電体の斜視図。The perspective view of an electrode body and a collector. 図１の非電解質二次電池の一部破断部分斜視図。The partially broken partial perspective view of the nonelectrolyte secondary battery of FIG. 図１の非電解質二次電池の一部破断分解側面図。FIG. 2 is a partially broken exploded side view of the non-electrolyte secondary battery of FIG. 1. 図１の非電解質二次電池の一部横断面図。The partial cross section figure of the nonelectrolyte secondary battery of FIG. 電極体の集電タブの断面図。Sectional drawing of the current collection tab of an electrode body. 電極体及び集電体の平面図。The top view of an electrode body and a collector. 上部スペーサの上方斜視図。The upper perspective view of an upper spacer. 上部スペーサの下方斜視図。The lower perspective view of an upper spacer. 電極体及び蓋の組付工程を示す断面図。Sectional drawing which shows the assembly | attachment process of an electrode body and a lid | cover. 電極体及び蓋の他の組付工程を示す断面図。Sectional drawing which shows the other assembly | attachment process of an electrode body and a lid | cover. 第２実施形態の電極体及び集電体の平面図。The top view of the electrode body and collector of 2nd Embodiment. 第２実施形態の非電解質二次電池の一部破断部分斜視図。The partially broken partial perspective view of the nonelectrolyte secondary battery of 2nd Embodiment. 集電体の変形例の平面図。The top view of the modification of an electrical power collector. 集電体の他の変形例の平面図。The top view of the other modification of an electrical power collector.

以下、本発明に係る実施形態を添付図面に従って説明する。なお、以下の説明では、必要に応じて特定の方向や位置を示す用語（例えば、「上」、「下」、「側」、「端」を含む用語）を用いるが、それらの用語の使用は図面を参照した発明の理解を容易にするためであって、それらの用語の意味によって本発明の技術的範囲が限定されるものではない。また、以下の説明は、本質的に例示に過ぎず、本発明、その適用物、あるいは、その用途を制限することを意図するものではない。   Embodiments according to the present invention will be described below with reference to the accompanying drawings. In the following description, terms indicating specific directions and positions (for example, terms including “up”, “down”, “side”, “end”) are used as necessary. Is for facilitating understanding of the invention with reference to the drawings, and the technical scope of the present invention is not limited by the meaning of these terms. Further, the following description is merely illustrative in nature and is not intended to limit the present invention, its application, or its use.

（第１実施形態）
図１及び図２は、本発明の第１実施形態に係るリチウムイオン二次電池（以下、単に電池という）１を示す。 (First embodiment)
1 and 2 show a lithium ion secondary battery (hereinafter simply referred to as a battery) 1 according to a first embodiment of the present invention.

（全体構成）
図１及び図２を参照すると、電池１は、外装体１０、電極体２０、絶縁シート３０、底部スペーサ４０、正極及び負極の外部端子５０Ａ，５０Ｂ、正負の集電体６０Ａ，６０Ｂ、上側パッキン７０Ａ，７０Ｂ、下側パッキン８０Ａ，８０Ｂ、及び上部スペーサ９０を備える。 (overall structure)
1 and 2, the battery 1 includes an outer package 10, an electrode body 20, an insulating sheet 30, a bottom spacer 40, positive and negative external terminals 50A and 50B, positive and negative current collectors 60A and 60B, an upper packing. 70A, 70B, lower packings 80A, 80B, and an upper spacer 90 are provided.

外装体（ケース）１０は、ケース本体１１と、ケース本体１１の開口１１ａを閉じる蓋１２とを備える。本実施形態では、ケース本体１１と蓋１２は、アルミニウム又はアルミニウム合金製である。ケース本体１１は長方形板状の底壁部１１ｂと、底壁部１１ｂの長辺から立ち上がる一対の長側壁部１１ｃ，１１ｃと、底壁部１１ｂの短辺から立ち上がる一対の短側壁部１１ｄ，１１ｄとを備える。蓋１２は概ね長方形板状である。長側壁部１１ｃと短側壁部１１ｄの上端が、ケース本体１１の開口１１ａを画定している。電解液が充填されたケース本体１１内には、電極体２０が収容されている。電極体２０は絶縁シート３０で覆われている。電極体２０とケース本体１１の底壁部１１ｂの間に底部スペーサ４０が介在している。下側パッキン８０Ａ，８０Ｂと上部スペーサ９０も、ケース本体１１内に収容されている。   The exterior body (case) 10 includes a case main body 11 and a lid 12 that closes an opening 11 a of the case main body 11. In the present embodiment, the case body 11 and the lid 12 are made of aluminum or an aluminum alloy. The case body 11 has a rectangular plate-like bottom wall portion 11b, a pair of long side wall portions 11c, 11c rising from the long side of the bottom wall portion 11b, and a pair of short side wall portions 11d, 11d rising from the short side of the bottom wall portion 11b. With. The lid 12 has a generally rectangular plate shape. Upper ends of the long side wall portion 11 c and the short side wall portion 11 d define an opening 11 a of the case body 11. An electrode body 20 is accommodated in the case body 11 filled with the electrolytic solution. The electrode body 20 is covered with an insulating sheet 30. A bottom spacer 40 is interposed between the electrode body 20 and the bottom wall portion 11 b of the case body 11. Lower packings 80 </ b> A and 80 </ b> B and an upper spacer 90 are also accommodated in the case body 11.

図３及び図４を併せて参照すると、電極体２０は、いずれも一定幅の長尺な帯状である正極電極シート２１、負極電極シート２２、及び微多孔性樹脂シートからなる２枚のセパレータ２３，２３を重ね合わせて、概ね高扁平率の長円状に巻回したものである。正極電極シート２１の一つの層と、それに隣接する負極電極シート２２の一つの層との間には、２枚のセパレータ２３，２３のうちのいずれか一方が介在している。正極電極シート２１、負極電極シート２２、及び２枚のセパレータ２３，２３の巻回の軸線（巻回軸）は、図３において符号Ａで概念的に示されている。電極体２０は、巻回軸Ａが概ね、ケース本体１１の底壁部１１ｂと開口１１ａが対向する方向（図１において上下方向）に延びる姿勢で、ケース本体１１内に収容されている。   Referring to FIGS. 3 and 4 together, the electrode body 20 includes a positive electrode sheet 21, a negative electrode sheet 22, and two separators 23 made of a microporous resin sheet, each of which is a long strip having a constant width. , 23 are overlapped and wound in an oval shape with a generally high flatness. One of the two separators 23 and 23 is interposed between one layer of the positive electrode sheet 21 and one layer of the negative electrode sheet 22 adjacent thereto. The winding axis (winding axis) of the positive electrode sheet 21, the negative electrode sheet 22, and the two separators 23, 23 is conceptually indicated by reference numeral A in FIG. The electrode body 20 is accommodated in the case main body 11 in such a posture that the winding axis A extends in a direction in which the bottom wall portion 11b of the case main body 11 and the opening 11a face each other (vertical direction in FIG. 1).

図３に示すように、巻回軸Ａの延びる方向から見た電極体２０の端部２０ａ，２０ｂは、互いに対向する一対の直線部２０ｃ，２０ｄと、これらの直線部２０ｃ，２０ｄを接続するように互いに対向する一対の湾曲部２０ｅ，２０ｅとを有する。   As shown in FIG. 3, the ends 20a and 20b of the electrode body 20 viewed from the direction in which the winding axis A extends connect a pair of linear portions 20c and 20d facing each other and the linear portions 20c and 20d. Thus, it has a pair of curved parts 20e and 20e which mutually oppose.

正極電極シート２１は、帯状の正極金属箔２４と、この正極金属箔２４の両面に形成された正極活物質層２５とを備える。正極電極シート２１の幅方向の一方（図３及び図４において下側）の端部では、正極活物質層２５が正極金属箔２４の側縁まで設けられている。正極電極シート２１の幅方向の他方（図３及び図４において上側）の端部には、正極活物質層２５を設けずに、正極金属箔２４を露出させた未塗工部２４ａが設けられている。   The positive electrode sheet 21 includes a strip-shaped positive metal foil 24 and a positive electrode active material layer 25 formed on both surfaces of the positive metal foil 24. The positive electrode active material layer 25 is provided up to the side edge of the positive electrode metal foil 24 at one end (the lower side in FIGS. 3 and 4) in the width direction of the positive electrode sheet 21. At the other end in the width direction of the positive electrode sheet 21 (upper side in FIGS. 3 and 4), an uncoated portion 24a in which the positive electrode metal foil 24 is exposed is provided without providing the positive electrode active material layer 25. ing.

負極電極シート２２は、帯状の負極金属箔２６と、この負極金属箔２６の両面に形成された負極活物質層２７とを備える。負極電極シート２２の幅方向の一方（図３及び図４において下側）の端部では、負極活物質層２７が負極金属箔２６の側縁まで設けられている。負極電極シート２２の幅方向の他方（図３及び図４において上側）の端部には、負極活物質層２７を設けずに、負極金属箔２６を露出させた未塗工部２６ａが設けられている。   The negative electrode sheet 22 includes a strip-shaped negative electrode metal foil 26 and negative electrode active material layers 27 formed on both surfaces of the negative electrode metal foil 26. At one end in the width direction of the negative electrode sheet 22 (lower side in FIGS. 3 and 4), the negative electrode active material layer 27 is provided up to the side edge of the negative electrode metal foil 26. At the other end in the width direction of the negative electrode sheet 22 (upper side in FIGS. 3 and 4), an uncoated portion 26a in which the negative electrode metal foil 26 is exposed without providing the negative electrode active material layer 27 is provided. ing.

正極金属箔２４には、未塗工部２４ａから幅方向外向きに突出する複数の突部２４ｂが、長手方向に間隔をあけて設けられている。正極電極シート２１、負極電極シート２２、及びセパレータ２３，２３を重ね合わせて巻回した状態では、複数の突部２４ｂが互い重ね合わされて電極体２０から突出するタブ状の部分（正極集電タブ２８）を形成している。負極金属箔２６にも正極金属箔２４の突部２４ｂと同様の複数の突部２６ｂが設けられており、これらの突部２６ｂが互い重ね合わされることで、電極体２０から突出する負極集電タブ２９が形成されている。   The positive electrode metal foil 24 is provided with a plurality of protrusions 24 b protruding outward in the width direction from the uncoated part 24 a with a gap in the longitudinal direction. In a state in which the positive electrode sheet 21, the negative electrode sheet 22, and the separators 23 and 23 are overlapped and wound, a tab-shaped portion (positive electrode current collecting tab) in which a plurality of protrusions 24b are overlapped with each other and protrude from the electrode body 20 28). The negative electrode metal foil 26 is also provided with a plurality of protrusions 26b similar to the protrusions 24b of the positive electrode metal foil 24, and the negative electrode current collector protruding from the electrode body 20 by overlapping these protrusions 26b. Tabs 29 are formed.

図３を参照すると、正極集電タブ２８と負極集電タブ２９は、電極体２０の一方の端部２０ａ（図３において上側の端部）から突出している。また、電極体２０の端部２０ａを巻回軸Ａの延びる方向から見たときの長手方向の中心線Ｂに対し、一対の直線部２０ｃ，２０ｄのうちの一方側（図３において手前側）の第１直線部２０ｃから、正極集電タブ２８と負極集電タブ２９が突出している。   Referring to FIG. 3, the positive electrode current collecting tab 28 and the negative electrode current collecting tab 29 protrude from one end portion 20 a (the upper end portion in FIG. 3) of the electrode body 20. Moreover, one side (front side in FIG. 3) of the pair of linear portions 20c and 20d with respect to the center line B in the longitudinal direction when the end portion 20a of the electrode body 20 is viewed from the direction in which the winding axis A extends. A positive current collecting tab 28 and a negative current collecting tab 29 protrude from the first straight portion 20c.

蓋１２の一端側（図１において左側）に正極の外部端子５０Ａが配置され、他端側（図１において右側）に負極の外部端子５０Ｂが配置されている。外部端子５０Ａ，５０Ｂは蓋１２の外側面（上側面）１２ａに配置される板状部５１Ａ，５１Ｂを備える。板状部５１Ａ，５１Ｂにはバスバーのような接続部材が溶接されて外部回路に接続される。   A positive external terminal 50A is disposed on one end side (left side in FIG. 1) of the lid 12, and a negative external terminal 50B is disposed on the other end side (right side in FIG. 1). The external terminals 50 </ b> A and 50 </ b> B include plate-like portions 51 </ b> A and 51 </ b> B disposed on the outer side surface (upper side surface) 12 a of the lid 12. A connecting member such as a bus bar is welded to the plate-like portions 51A and 51B and connected to an external circuit.

図１及び図２に加えて図５を参照すると、正極の外部端子５０Ａは、蓋１２の外側面１２ａに配置される板状部５１Ａと、板状部５１Ａの下面から下方に突出する円筒状の軸部５２を備える。板状部５１Ａと軸部５２は一体成形されている。軸部５２は、蓋１２を貫通してケース本体１１の内部に突出している。   Referring to FIG. 5 in addition to FIGS. 1 and 2, the positive external terminal 50A includes a plate-like portion 51A disposed on the outer surface 12a of the lid 12, and a cylindrical shape protruding downward from the lower surface of the plate-like portion 51A. The shaft part 52 is provided. The plate-like portion 51A and the shaft portion 52 are integrally formed. The shaft portion 52 penetrates the lid 12 and projects into the case main body 11.

正極の外部端子５０Ａの軸部５２の下端には拡径部５２ａが設けられ、それによって正極の外部端子５０Ａが蓋１２に対して加締固定されている。具体的には、外部端子５０Ａの板状部５１Ａと拡径部５２ａとの間に、絶縁樹脂製の上側パッキン７０Ａ、蓋１２、絶縁樹脂性の下側パッキン８０Ａ、及び正極の集電体６０Ａ（後述する被加締部６２Ａ）が挟み込まれることで、正極の外部端子５０Ａと集電体６０Ａが蓋１２に固定されている。蓋１２の外側面１２ａと外部端子５０Ａとの間に上側パッキン７０Ａが介装され、蓋１２の内側面（下側面）１２ｂと集電体６０Ａとの間に、下側パッキン８０Ａが介装されている。本実施形態では、正極の外部端子５０Ａと集電体６０Ａは、アルミニウム又はアルミニウム合金製である。   An enlarged diameter portion 52 a is provided at the lower end of the shaft portion 52 of the positive external terminal 50 </ b> A, whereby the positive external terminal 50 </ b> A is crimped and fixed to the lid 12. Specifically, an insulating resin upper packing 70A, a lid 12, an insulating resin lower packing 80A, and a positive current collector 60A are provided between the plate-like portion 51A and the enlarged diameter portion 52a of the external terminal 50A. By sandwiching (a to-be-clamped portion 62 </ b> A described later), the positive external terminal 50 </ b> A and the current collector 60 </ b> A are fixed to the lid 12. An upper packing 70A is interposed between the outer surface 12a of the lid 12 and the external terminal 50A, and a lower packing 80A is interposed between the inner surface (lower surface) 12b of the lid 12 and the current collector 60A. ing. In the present embodiment, the positive external terminal 50A and the current collector 60A are made of aluminum or an aluminum alloy.

図１及び図２に加えて図６を参照すると、負極の外部端子５０Ｂは、蓋１２の外側面１２ａに配置される板状部５１Ｂと、板状部５１Ｂとは別体のリベット５３を備える。板状部５１Ｂに形成された貫通孔にリベット５３の上端の顎部５３ａが圧入され、それによってリベット５３が板状部５１Ｂに固定されている。リベット５３は板状部５１Ｂの下面から下方に突出し、蓋１２を貫通してケース本体１１の内部に突出している。   Referring to FIG. 6 in addition to FIGS. 1 and 2, the negative external terminal 50B includes a plate-like portion 51B disposed on the outer surface 12a of the lid 12, and a rivet 53 separate from the plate-like portion 51B. . The jaw 53a at the upper end of the rivet 53 is press-fitted into the through-hole formed in the plate-like portion 51B, whereby the rivet 53 is fixed to the plate-like portion 51B. The rivet 53 protrudes downward from the lower surface of the plate-like portion 51 </ b> B, penetrates the lid 12, and protrudes into the case body 11.

負極の外部端子５０Ｂのリベット５３の下端には拡径部５３ｂが設けられ、それによって負極の外部端子５０Ｂが蓋１２に対して加締固定されている。具体的には、外部端子５０Ｂの板状部５１Ｂと拡径部５３ｂとの間に、絶縁樹脂製の上側パッキン７０Ｂ、蓋１２、絶縁樹脂製の上側パッキン７０Ｂ、及び負極の集電体６０Ｂが挟み込まれることで、負極の外部端子５０Ｂと集電体６０Ｂが蓋１２に固定されている。蓋１２の外側面１２ａと外部端子５０Ｂとの間に下側パッキン８０Ｂが介装され、蓋１２の内側面１２ｂと負極の集電体６０Ｂとの間に下側パッキン８０Ｂが介装されている。本実施形態では、負極の外部端子５０Ｂは板状部５１Ｂがアルミニウム又はアルミニウム合金製でリベット５３が銅又は銅合金製であり、負極の集電体６０Ｂは銅又は銅合金製である。   An enlarged diameter portion 53b is provided at the lower end of the rivet 53 of the negative external terminal 50B, whereby the negative external terminal 50B is crimped and fixed to the lid 12. Specifically, the upper packing 70B made of insulating resin, the lid 12, the upper packing 70B made of insulating resin, and the negative electrode current collector 60B are disposed between the plate-like portion 51B and the enlarged diameter portion 53b of the external terminal 50B. The negative external terminal 50B and the current collector 60B are fixed to the lid 12 by being sandwiched. A lower packing 80B is interposed between the outer surface 12a of the lid 12 and the external terminal 50B, and a lower packing 80B is interposed between the inner surface 12b of the lid 12 and the negative electrode current collector 60B. . In this embodiment, the negative electrode external terminal 50B has a plate-like portion 51B made of aluminum or an aluminum alloy, the rivet 53 made of copper or a copper alloy, and the negative electrode current collector 60B made of copper or a copper alloy.

図７に最も明瞭に示すように、正極の集電体６０Ａは、被溶接部６１Ａと被加締部６２Ａを備える。被溶接部６１Ａは電極体２０の正極集電タブ２８に溶接されて、電気的かつ機械的に接続されている。被加締部６２Ａは、前述のように、正極の外部端子５０Ａの軸部５２に形成された拡径部５２ａによって蓋１２に対して加締固定されている。同様に、負極の集電体６０Ｂは、被溶接部６１Ｂと被加締部６２Ｂを備える。被溶接部６１Ｂは電極体２０の負極集電タブ２９に溶接されて、電気的かつ機械的に接続されている。被加締部６２Ｂは、前述のように、負極の外部端子５０Ｂのリベット５３に形成された拡径部５３ｂによって、蓋１２に対して加締固定されている。   As shown most clearly in FIG. 7, the positive electrode current collector 60A includes a welded portion 61A and a crimped portion 62A. The welded portion 61A is welded to the positive electrode current collecting tab 28 of the electrode body 20, and is electrically and mechanically connected. As described above, the crimped portion 62A is crimped and fixed to the lid 12 by the enlarged diameter portion 52a formed in the shaft portion 52 of the positive external terminal 50A. Similarly, the negative electrode current collector 60B includes a welded portion 61B and a crimped portion 62B. The welded portion 61B is welded to the negative electrode current collecting tab 29 of the electrode body 20, and is electrically and mechanically connected. As described above, the crimped portion 62B is crimped and fixed to the lid 12 by the enlarged diameter portion 53b formed on the rivet 53 of the negative external terminal 50B.

図８及び図９に最も明瞭に示すように、電極体２０と蓋１２の内側面１２ｂとの間には、上部スペーサ９０が介在している。   As shown most clearly in FIGS. 8 and 9, an upper spacer 90 is interposed between the electrode body 20 and the inner side surface 12 b of the lid 12.

（集電タブの詳細）
図１０に最も明瞭に示すように、集電タブ２８，２９は、巻回により電極シート２１，２２が積層された一対の直線部２０ｃ，２０ｄのうち、基部側が一方側の直線部（第１部分）２０ｃに位置し、他方側の直線部（第２部分）２０ｄに向けて折り曲げられて、先端側が直線部２０ｄ側で電極シート２１，２２の積層方向に配置された集電体６０Ａ，６０Ｂと電気的に接続されている。 (Details of current collector tab)
As shown most clearly in FIG. 10, the current collecting tabs 28 and 29 have a linear portion (first side) whose base side is one of the pair of straight portions 20 c and 20 d in which the electrode sheets 21 and 22 are stacked by winding. Current collectors 60A and 60B which are located in the portion) 20c and are bent toward the other straight portion (second portion) 20d, and the leading end side is arranged in the stacking direction of the electrode sheets 21 and 22 on the straight portion 20d side. And are electrically connected.

図１０に加えて図１１参照すると、集電タブ２８，２９は、溶接により各突部２４ｂ，２６ｂが互いに接合された先端側の接合部２８ａ，２９ａと、互いに接合されていない基部側の非接合部２８ｂ，２９ｂとを備える。接合部２８ａ，２９ａは、折り曲げにより各突部２４ｂ，２６ｂが一体的に湾曲される。非接合部２８ｂ，２９ｂは、折り曲げにより各突部２４ｂ，２６ｂが異なる曲率で自由に湾曲できる。   Referring to FIG. 11 in addition to FIG. 10, the current collecting tabs 28, 29 are connected to the front-side joints 28 a, 29 a where the protrusions 24 b, 26 b are joined to each other by welding and the non-joint base side non-joints. Joints 28b and 29b are provided. In the joint portions 28a and 29a, the protrusions 24b and 26b are integrally bent by bending. The non-joined portions 28b and 29b can be bent freely with different curvatures at the projections 24b and 26b by bending.

集電タブ２８，２９の全長Ｌは、電極体２０と蓋１２との間で２回折り曲げることが可能な寸法に設定されている。第１折曲部２８ｃ，２９ｃは、積層された電極シート２１，２２側に位置し、第１直線部２０ｃ側から第２直線部２０ｄ側へ向けて屈曲している。第２折曲部２８ｄ，２９ｄは、第１折曲部２８ｃ，２９ｃより集電体６０Ａ，６０Ｂ側に位置し、第２直線部２０ｄ側から第１直線部２０ｃ側へ向けて屈曲している。第２折曲部２８ｄ，２９ｄは、集電体６０Ａ，６０Ｂの接続部である第２被溶接部６１Ａ，６１Ｂ付近に位置する。これら折曲部２８ｃ，２９ｃ，２８ｄ，２９ｄは、集電タブ２８，２９の基部側から第１及び第２としているが、これは折り曲げる順番を意図するものではない。   The total length L of the current collecting tabs 28 and 29 is set to a dimension that can be bent twice between the electrode body 20 and the lid 12. The first bent portions 28c and 29c are located on the stacked electrode sheets 21 and 22 side, and are bent from the first straight portion 20c side to the second straight portion 20d side. The second bent portions 28d and 29d are located closer to the current collectors 60A and 60B than the first bent portions 28c and 29c, and are bent from the second straight portion 20d side toward the first straight portion 20c side. . The second bent portions 28d and 29d are located in the vicinity of the second welded portions 61A and 61B, which are connecting portions of the current collectors 60A and 60B. Although these bending parts 28c, 29c, 28d, and 29d are made into the 1st and 2nd from the base part side of the current collection tabs 28 and 29, this does not intend the turn order.

また、集電タブ２８，２９の全長Ｌは、第１及び第２折曲部２８ｃ，２９ｃ，２８ｄ，２９ｄに所定の柔軟性（遊び）を持たせることが可能な寸法に設定される。詳しくは、第１折曲部２８ｃ，２９ｃから、第２被溶接部６１Ａ，６１Ｂにおける集電タブ２８，２９の基部側端部までの寸法（距離）Ｌ１より、第１折曲部２８ｃ，２９ｃから第２折曲部２８ｄ，２９ｄまでの寸法Ｌ２は長い。Ｌ１，Ｌ２の寸法差Ｌ３は、第２折曲部２８ｄ，２９ｄが上部スペーサ９０の連結部９５Ａ，９５Ｂに干渉しない長さに設定される。   The total length L of the current collecting tabs 28 and 29 is set to a dimension that allows the first and second bent portions 28c, 29c, 28d, and 29d to have a predetermined flexibility (play). Specifically, the first bent portions 28c and 29c are determined from the dimension (distance) L1 from the first bent portions 28c and 29c to the base side end portions of the current collecting tabs 28 and 29 in the second welded portions 61A and 61B. To the second bent portions 28d and 29d is long. The dimensional difference L3 between L1 and L2 is set to such a length that the second bent portions 28d and 29d do not interfere with the connecting portions 95A and 95B of the upper spacer 90.

（集電体の詳細）
図１０に加えて図７及び図１２を参照すると、集電体６０Ａ，６０Ｂは、集電タブ２８，２９を蓋１２の外部端子５０Ａ，５０Ｂに電気的に接続させる。集電体６０Ａ，６０Ｂは、被接合部である被溶接部６１Ａ，６１Ｂ及び接続部である被加締部６２Ａ，６２Ｂに加え、集電タブ２８，２９の第１折曲部２８ｃ，２９ｃの干渉を回避する逃がし部６６Ａ，６６Ｂを更に備える。 (Details of current collector)
7 and 12 in addition to FIG. 10, the current collectors 60 </ b> A and 60 </ b> B electrically connect the current collecting tabs 28 and 29 to the external terminals 50 </ b> A and 50 </ b> B of the lid 12. The current collectors 60A and 60B include the first bent portions 28c and 29c of the current collecting tabs 28 and 29 in addition to the welded portions 61A and 61B that are the joined portions and the crimped portions 62A and 62B that are the connected portions. Further provided are escape portions 66A and 66B for avoiding interference.

図１２に最も明瞭に示すように、集電体６０Ａ，６０Ｂは、被溶接部６１Ａ，６１Ｂ及び被加締部６２Ａ，６２Ｂの一端側の縁６３Ａ，６３Ｂが直線上に位置する。被溶接部６１Ａ，６１Ｂ及び被加締部６２Ａ，６２Ｂは、それぞれ平面視四角形状である。被溶接部６１Ａ，６１Ｂの集電タブ２８，２９が突出する方向の幅Ｈ１は、被加締部６２Ａ，６２Ｂの幅Ｈ２より狭い。被加締部６２Ａ，６２Ｂと被溶接部６１Ａ，６１Ｂとは、集電タブ２８，２９が突出する方向と交差する方向（図３の中心線Ｂの外側）に隣接する。   As shown most clearly in FIG. 12, the current collectors 60A and 60B have the welded portions 61A and 61B and the edges 63A and 63B on one end side of the crimped portions 62A and 62B positioned on a straight line. The welded parts 61A and 61B and the crimped parts 62A and 62B each have a quadrangular shape in plan view. The width H1 of the welded portions 61A and 61B in the direction in which the current collecting tabs 28 and 29 protrude is narrower than the width H2 of the crimped portions 62A and 62B. The to-be-clamped portions 62A and 62B and the welded portions 61A and 61B are adjacent to the direction intersecting the direction in which the current collecting tabs 28 and 29 protrude (outside the center line B in FIG. 3).

図７に最も明瞭に示すように、被溶接部６１Ａ，６１Ｂと被加締部６２Ａ，６２Ｂとの間には、被加締部６２Ａ，６２Ｂを上部スペーサ９０の上側に配置するための段部６４Ａ，６４Ｂが設けられている。被溶接部６１Ａ，６１Ｂには、段部６４Ａ，６４Ｂが突出する方向と逆側である下面６１ａ側に、集電タブ２８，２９が溶接されている。被加締部６２Ａ，６２Ｂには、外部端子５０Ａ，５０Ｂの軸部５２及びリベット５３を貫通させる貫通孔６５Ａ，６５Ｂが設けられている。   As shown most clearly in FIG. 7, between the welded parts 61A, 61B and the crimped parts 62A, 62B, stepped portions for arranging the clamped parts 62A, 62B above the upper spacer 90 64A and 64B are provided. Current collecting tabs 28 and 29 are welded to the welded parts 61A and 61B on the lower surface 61a side opposite to the direction in which the stepped parts 64A and 64B protrude. The through-holes 65A and 65B through which the shaft portions 52 and the rivets 53 of the external terminals 50A and 50B pass are provided in the tightened portions 62A and 62B.

図１２に最も明瞭に示すように、被溶接部６１Ａ，６１Ｂ及び被加締部６２Ａ，６２Ｂの幅Ｈ１，Ｈ２の違いにより、被溶接部６１Ａ，６１Ｂの集電タブ２８，２９が突出する方向に隣接して形成される空間が逃がし部６６Ａ，６６Ｂである。被加締部６２Ａ，６２Ｂの幅Ｈ２は、電極体２０の直線部２０ｃ，２０ｄの積層方向の幅より広い。被加締部６２Ａ，６２Ｂは、電極体２０の端部２０ａに、第１及び第２直線部２０ｃ，２０ｄに跨がって位置する。逃がし部６６Ａ，６６Ｂは、被溶接部６１Ａ，６１Ｂの第１直線部２０ｃの上方に位置する部分に設けられている。即ち、逃がし部６６Ａ，６６Ｂは、被加締部６２Ａ，６２Ｂと同一幅の被溶接部６１Ａ，６１Ｂに対して、第１直線部２０ｃの上方に位置する部分（図１２において集電タブ２８，２９が突出する方向の先端（接合部２８ａ，２９ａ）側）に切り欠きを設けることにより形成される。   As shown most clearly in FIG. 12, the direction in which the current collecting tabs 28 and 29 of the welded portions 61A and 61B project due to the differences in the widths H1 and H2 of the welded portions 61A and 61B and the crimped portions 62A and 62B. Spaces formed adjacent to are escape portions 66A and 66B. The width H2 of the tightened portions 62A and 62B is wider than the width in the stacking direction of the straight portions 20c and 20d of the electrode body 20. The to-be-clamped portions 62A and 62B are located at the end 20a of the electrode body 20 across the first and second linear portions 20c and 20d. The escape portions 66A and 66B are provided in portions located above the first straight portions 20c of the welded portions 61A and 61B. That is, the relief portions 66A and 66B are located above the first straight portion 20c with respect to the welded portions 61A and 61B having the same width as the crimped portions 62A and 62B (the current collecting tabs 28 and 66B in FIG. 12). It is formed by providing a notch at the tip (joint portion 28a, 29a side) in the direction in which 29 protrudes.

（上部スペーサの詳細）
図１０に加えて図９及び図１３Ａ，Ｂを参照すると、上部スペーサ９０は、全体として蓋１２と同様の細長い矩形状であり、中央部９１と、中央部から延びる一対の集電体収容部９２Ａ，９２Ｂを備える。集電体収容部９２Ａ，９２Ｂは、一端が中央部９１に連結され、他端が電極体２０の湾曲部２０ｅ，２０ｅ上に位置する被加締部配置部９７Ａ，９７Ｂに連結されている。中央部９１には、蓋１２に設けられた安全弁と対向する開口９１ａが設けられている。 (Details of upper spacer)
9 and FIGS. 13A and 13B in addition to FIG. 10, the upper spacer 90 as a whole has an elongated rectangular shape similar to that of the lid 12, and includes a central portion 91 and a pair of current collector housing portions extending from the central portion. 92A and 92B are provided. One end of each of the current collector housing portions 92A and 92B is coupled to the center portion 91, and the other end is coupled to the crimped portion arrangement portions 97A and 97B located on the curved portions 20e and 20e of the electrode body 20. The central portion 91 is provided with an opening 91 a that faces a safety valve provided on the lid 12.

集電体収容部９２Ａ，９２Ｂは、側壁部９３Ａ，９３Ｂと、側壁部９３Ａ，９３Ｂの上端から延びる上壁部９４Ａ，９４Ｂと、側壁部９３Ａ，９３Ｂの下端から上壁部９４Ａ，９４Ｂと概ね平行に延びる下壁部９５Ａ，９５Ｂとを備える。上壁部９４Ａ，９４Ｂと下壁部９５Ａ，９５Ｂの先端９４ａ，９５ａ間に、集電体６０Ａ，６０Ｂの被溶接部６１Ａ，６１Ｂと、第２折曲部２８ｄ，２９ｄを含む集電タブ２８，２９の先端側が差し込まれる横長の開口部９８Ａ，９８Ｂが形成されている。   The current collector housing portions 92A and 92B are generally composed of side wall portions 93A and 93B, upper wall portions 94A and 94B extending from the upper ends of the side wall portions 93A and 93B, and upper wall portions 94A and 94B from the lower ends of the side wall portions 93A and 93B. Lower wall portions 95A and 95B extending in parallel. Current collecting tab 28 including welded portions 61A and 61B of current collectors 60A and 60B and second bent portions 28d and 29d between upper wall portions 94A and 94B and tips 94a and 95a of lower wall portions 95A and 95B. , 29 are formed with horizontally long openings 98A and 98B.

側壁部９３Ａ，９３Ｂは、電極体２０の第２直線部２０ｄ側に位置する。上壁部９４Ａ，９４Ｂは、集電体６０Ａ，６０Ｂの被溶接部６１Ａ，６１Ｂと蓋１２の内側面１２ｂの間を、第２直線部２０ｄ側から第１直線部２０ｃ側へ延びる。上壁部９４Ａ，９４Ｂの先端９４ａは、集電体６０Ａ，６０Ｂの被溶接部６１Ａ，６１Ｂを覆うように逃がし部６６Ａ，６６Ｂ近傍に位置する。下壁部９５Ａ，９５Ｂは、電極体２０の端部２０ａと集電タブ２８，２９の間を、第２直線部２０ｄ側から第１直線部２０ｃ側へ延びる。下壁部９５Ａ，９５Ｂの先端９５ａは、電極体２０の第１直線部２０ｃ上において、第１折曲部２８ｃ，２９ｃの第２直線部２０ｄ側の近傍に位置する。即ち、第１直線部２０ｃの上部には、下壁部９５Ａ，９５Ｂが無く、開口部９８Ａ，９８Ｂに向けて集電タブ２８，２９を配置可能な空間が形成されている。   The side wall portions 93 </ b> A and 93 </ b> B are located on the second straight portion 20 d side of the electrode body 20. The upper wall portions 94A and 94B extend from the second straight portion 20d side to the first straight portion 20c side between the welded portions 61A and 61B of the current collectors 60A and 60B and the inner side surface 12b of the lid 12. The tips 94a of the upper wall portions 94A and 94B are located in the vicinity of the escape portions 66A and 66B so as to cover the welded portions 61A and 61B of the current collectors 60A and 60B. The lower wall portions 95A and 95B extend between the end 20a of the electrode body 20 and the current collecting tabs 28 and 29 from the second straight portion 20d side to the first straight portion 20c side. The tips 95a of the lower wall portions 95A and 95B are located on the first straight portion 20c of the electrode body 20 in the vicinity of the first bent portions 28c and 29c on the second straight portion 20d side. That is, in the upper part of the first straight part 20c, there is no lower wall part 95A, 95B, and a space in which the current collecting tabs 28, 29 can be arranged toward the opening parts 98A, 98B is formed.

図８及び図１３Ａを参照すると、上壁部９４Ａ，９４Ｂの被加締部配置部９７Ａ，９７Ｂ側端部には、挿通溝９６Ａ，９６Ｂが設けられている。集電体収容部９２Ａ，９２Ｂ内に集電体６０Ａ，６０Ｂの被溶接部６１Ａ，６１Ｂが配置されると、挿通溝９６Ａ，９６Ｂ内に集電体６０Ａ，６０Ｂの段部６４Ａ，６４Ｂが位置する。これにより、被加締部配置部９７Ａ，９７Ｂ上に集電体６０Ａ，６０Ｂの被加締部６２Ａ，６２Ｂを位置する。   Referring to FIGS. 8 and 13A, insertion grooves 96A and 96B are provided at the ends of the upper wall portions 94A and 94B on the side to be tightened portions 97A and 97B. When the welded portions 61A and 61B of the current collectors 60A and 60B are arranged in the current collector housing portions 92A and 92B, the step portions 64A and 64B of the current collectors 60A and 60B are positioned in the insertion grooves 96A and 96B. To do. Thereby, the to-be-clamped parts 62A and 62B of the current collectors 60A and 60B are positioned on the to-be-clamped part arrangement parts 97A and 97B.

図１３Ａ，Ｂに最も明瞭に示すように、被加締部配置部９７Ａ，９７Ｂは、底壁部９７ａと、底壁部９７ａ上に形成された内側周壁部９７ｂとを備える。内側周壁部９７ｂの内部には、外部端子５０Ａ，５０Ｂの拡径部５２ａ，５３ｂが位置する。底壁部９７ａ上には、内側周壁部９７ｂを取り囲むように、集電体６０Ａ，６０Ｂの被加締部６２Ａ，６２Ｂを配置する外側周壁部９７ｃが更に設けられている。   As most clearly shown in FIGS. 13A and 13B, the crimped portion arrangement portions 97A and 97B include a bottom wall portion 97a and an inner peripheral wall portion 97b formed on the bottom wall portion 97a. The enlarged diameter portions 52a and 53b of the external terminals 50A and 50B are located inside the inner peripheral wall portion 97b. On the bottom wall portion 97a, an outer peripheral wall portion 97c for arranging the crimped portions 62A and 62B of the current collectors 60A and 60B is further provided so as to surround the inner peripheral wall portion 97b.

次に、電池１の組立工程について説明する。   Next, the assembly process of the battery 1 will be described.

図７及び図１２に示すように、集電タブ２８，２９を突出させた第１直線部２０ｃ側が下方に位置するように、電極体２０を横向きに配置する。ついで、被加締部６２Ａ，６２Ｂが被溶接部６１Ａ，６１Ｂより上側に位置させ、被溶接部６１Ａ，６１Ｂの縁６３Ａ，６３Ｂ側に電極体２０が位置するように集電体６０Ａ，６０Ｂを配置する。そして、集電タブ２８，２９の先端上面に集電体６０Ａ，６０Ｂの被溶接部６１Ａ，６１Ｂを配置し、集電タブ２８，２９を被溶接部６１Ａ，６１Ｂの下面６１ａ側に超音波溶接により接続する。   As shown in FIGS. 7 and 12, the electrode body 20 is disposed sideways so that the first linear portion 20 c side from which the current collecting tabs 28 and 29 protrude is positioned below. Next, the current collectors 60A and 60B are positioned such that the crimped portions 62A and 62B are positioned above the welded portions 61A and 61B, and the electrode body 20 is positioned on the edges 63A and 63B of the welded portions 61A and 61B. Deploy. Then, the welded portions 61A and 61B of the current collectors 60A and 60B are arranged on the top surfaces of the current collector tabs 28 and 29, and the current collector tabs 28 and 29 are ultrasonically welded to the lower surface 61a side of the welded portions 61A and 61B. Connect with.

図１２に最も明瞭に示すように、集電体６０Ａ，６０Ｂは、被溶接部６１Ａ，６１Ｂと被加締部６２Ａ，６２Ｂとが、集電タブ２８，２９が突出する方向と交差する方向に隣接配置されている。そして、被溶接部６１Ａ，６１Ｂの集電タブ２８，２９が突出する方向の前側には、切り欠きからなる逃がし部６６Ａ，６６Ｂしか設けられていない。そのため、被溶接部６１Ａ，６１Ｂと集電タブ２８，２９を超音波溶接するための治具１００を配置する際、集電タブ２８，２９が突出する方向の前側には何も妨げになる部材が無い。よって、治具１００を容易に配置できるため、作業性を向上できる。   As shown most clearly in FIG. 12, the current collectors 60A and 60B are arranged so that the welded portions 61A and 61B and the crimped portions 62A and 62B intersect the direction in which the current collecting tabs 28 and 29 protrude. Adjacent to each other. And only the relief parts 66A and 66B consisting of notches are provided on the front side of the welded parts 61A and 61B in the direction in which the current collecting tabs 28 and 29 protrude. Therefore, when the jig 100 for ultrasonic welding the welded portions 61A, 61B and the current collecting tabs 28, 29 is arranged, a member that obstructs nothing on the front side in the direction in which the current collecting tabs 28, 29 protrude. There is no. Therefore, since the jig 100 can be easily arranged, workability can be improved.

集電タブ２８，２９に集電体６０Ａ，６０Ｂを接続すると、ついで、図１４Ａに示すように、集電タブ２８，２９を突出させた第１直線部２０ｃが上方に位置するように電極体２０を配置する。ついで、蓋１２の外側面１２ａに上側パッキン７０Ａ，７０Ｂ及び外部端子５０Ａ，５０Ｂを取り付け、内側面１２ｂが上方に位置するように配置する。ついで、蓋１２の内側面１２ｂ側に下側パッキン８０Ａ，８０Ｂ及び集電体６０Ａ，６０Ｂの被加締部６２Ａ，６２Ｂを配置する。そして、外部端子５０Ａ，５０Ｂの軸部５２及びリベット５３を加締め、外部端子５０Ａ，５０Ｂと集電体６０Ａ，６０Ｂとを電気的に接続する。これにより、集電タブ２８，２９及び集電体６０Ａ，６０Ｂを介して、電極体２０と外部端子５０Ａ，５０Ｂとが電気的に接続される。   When the current collectors 60A and 60B are connected to the current collecting tabs 28 and 29, then, as shown in FIG. 14A, the electrode body so that the first linear portion 20c from which the current collecting tabs 28 and 29 protrude is positioned above. 20 is arranged. Next, the upper packings 70A and 70B and the external terminals 50A and 50B are attached to the outer side surface 12a of the lid 12, and are arranged so that the inner side surface 12b is positioned upward. Next, the lower packings 80A and 80B and the clamped portions 62A and 62B of the current collectors 60A and 60B are disposed on the inner surface 12b side of the lid 12. And the axial part 52 and the rivet 53 of external terminal 50A, 50B are crimped, and external terminal 50A, 50B and collector 60A, 60B are electrically connected. Thereby, the electrode body 20 and the external terminals 50A and 50B are electrically connected via the current collecting tabs 28 and 29 and the current collectors 60A and 60B.

電極体２０に蓋１２を組み付けると、ついで、図１１及び図１４Ａに示すように、集電体６０Ａ，６０Ｂの被溶接部６１Ａ，６１Ｂ近傍の折曲位置Ｃ１を中心として、集電タブ２８，２９を１８０度折り曲げる。集電タブ２８，２９の折曲方向は、組立状態で蓋１２が上側に位置するように、第２直線部２０ｄに対して逆向きとする。ついで、図１１及び図１４Ｂに矢印で示すように、集電タブ２８，２９を基部側の折曲位置Ｃ２を中心として集電タブ２８，２９を９０度折り曲げる。集電タブ２８，２９の折曲方向は、組立状態で蓋１２が上側に位置するように、第２直線部２０ｄ側とする。   When the lid 12 is assembled to the electrode body 20, then, as shown in FIGS. 11 and 14A, the current collecting tabs 28, centering on the bending position C1 near the welded portions 61A, 61B of the current collectors 60A, 60B, 29 is bent 180 degrees. The bending directions of the current collecting tabs 28 and 29 are opposite to the second linear portion 20d so that the lid 12 is positioned on the upper side in the assembled state. Next, as shown by arrows in FIGS. 11 and 14B, the current collecting tabs 28 and 29 are bent 90 degrees around the bending position C2 on the base side. The bending direction of the current collecting tabs 28 and 29 is the second linear portion 20d side so that the lid 12 is positioned on the upper side in the assembled state.

これにより、図９に示すように、電極体２０の端部２０ａと平行に蓋１２が配置される。この状態では、集電タブ２８，２９の第１折曲部２８ｃ，２９ｃは、第１直線部２０ｃ上に位置し、膨出した上側頂部が逃がし部６６Ａ，６６Ｂを通して集電体６０Ａ，６０Ｂの下面６１ａよりも上側に位置する。集電タブ２８，２９の第２折曲部２８ｄ，２９ｄは、第２直線部２０ｄ上に位置し、集電タブ２８，２９を接合した被溶接部６１Ａ，６１Ｂも第２直線部２０ｄ上に位置する。   Thereby, as shown in FIG. 9, the lid 12 is disposed in parallel with the end 20 a of the electrode body 20. In this state, the first bent portions 28c and 29c of the current collecting tabs 28 and 29 are located on the first straight portion 20c, and the bulged upper top portions of the current collectors 60A and 60B pass through the relief portions 66A and 66B. It is located above the lower surface 61a. The second bent portions 28d and 29d of the current collecting tabs 28 and 29 are located on the second straight portion 20d, and the welded portions 61A and 61B joined to the current collecting tabs 28 and 29 are also on the second straight portion 20d. To position.

ついで、上部スペーサ９０を電極体２０の第２直線部２０ｄ側の横に配置し、電極体２０と蓋１２との間に横から差し込む。詳しくは、集電体収容部９２Ａ，９２Ｂの各先端９４ａ，９５ａが電極体２０と対向するように配置する。ついで、図８及び図１０に示すように、上壁部９４Ａ，９４Ｂを被溶接部６１Ａ，６１Ｂと蓋１２の内側面１２ｂの間に挿入し、下壁部９５Ａ，９５Ｂを集電タブ２８，２９と電極体２０の端部２０ａの間に挿入する。これにより、集電体６０Ａ，６０Ｂの被溶接部６１Ａ，６１Ｂと第２折曲部２８ｄ，２９ｄを含む接合部分が集電体収容部９２Ａ，９２Ｂ内に配置される。   Next, the upper spacer 90 is disposed on the side of the second linear portion 20 d side of the electrode body 20 and is inserted between the electrode body 20 and the lid 12 from the side. Specifically, the current collector housing portions 92 </ b> A and 92 </ b> B are disposed so that the tips 94 a and 95 a face the electrode body 20. Next, as shown in FIGS. 8 and 10, the upper wall portions 94A, 94B are inserted between the welded portions 61A, 61B and the inner side surface 12b of the lid 12, and the lower wall portions 95A, 95B are connected to the current collecting tabs 28, 29 and the end 20a of the electrode body 20. As a result, the joined portions including the welded portions 61A and 61B and the second bent portions 28d and 29d of the current collectors 60A and 60B are arranged in the current collector housing portions 92A and 92B.

ついで、図１及び図１０に示すように、電極体２０及び上部スペーサ９０の外周部を絶縁シート３０で被覆した後、ケース本体１１の内部に電極体２０を絶縁シート３０と一緒に収容させる。最後に、蓋１２をケース本体１１側に押圧し、蓋１２をケース本体１１の開口１１ａに溶接することにより密封する。   Next, as shown in FIGS. 1 and 10, the outer periphery of the electrode body 20 and the upper spacer 90 is covered with the insulating sheet 30, and then the electrode body 20 is accommodated together with the insulating sheet 30 in the case body 11. Finally, the lid 12 is pressed toward the case body 11 and sealed by welding the lid 12 to the opening 11 a of the case body 11.

このように組み立てた電池１の電極体２０の端部２０ａ側では、集電タブ２８，２９の基部（非接合部２８ｂ，２９ｂ）側が電極体２０第１直線部２０ｃ側に位置し、集電タブ２８，２９の先端（接合部２８ａ，２９ａ）側が第２直線部２０ｄ側に位置する。これにより、集電タブ２８，２９の第１折曲部２８ｃ，２９ｃが第１直線部２０ｃ側に位置し、集電タブ２８，２９と接合した集電体６０Ａ，６０Ｂの被溶接部６１Ａ，６１Ｂが第２直線部２０ｄ側に位置する。即ち、遊びを持たせることによって膨出する第１折曲部２８ｃ，２９ｃを配置する部分と、嵩張る接合部を配置する部分とが、電極体２０の端部２０ａで、横方向に隣接配置されている。よって、電極体２０の端部での低背化を図ることができ、電極体２０と蓋１２との間の距離を小さくすることができる。そのため、同一高さの電池１を製造する場合、電極体２０を大きくすることができるため、高容量化を図ることができる。   On the end 20a side of the electrode body 20 of the battery 1 assembled in this way, the base portions (non-joined portions 28b and 29b) of the current collecting tabs 28 and 29 are located on the electrode body 20 first linear portion 20c side, The tips (joint portions 28a, 29a) side of the tabs 28, 29 are located on the second linear portion 20d side. As a result, the first bent portions 28c, 29c of the current collecting tabs 28, 29 are positioned on the first linear portion 20c side, and the welded portions 61A of the current collectors 60A, 60B joined to the current collecting tabs 28, 29 are provided. 61B is located on the second linear portion 20d side. That is, a portion where the first bent portions 28c and 29c that bulge out by having play and a portion where the bulky joint portion is arranged are adjacently arranged in the lateral direction at the end portion 20a of the electrode body 20. ing. Therefore, the height of the end portion of the electrode body 20 can be reduced, and the distance between the electrode body 20 and the lid 12 can be reduced. Therefore, when the battery 1 having the same height is manufactured, the electrode body 20 can be enlarged, so that the capacity can be increased.

また、集電タブ２８，２９は、電極体２０の端部２０ａで２回折り返すことが可能な全長Ｌで形成されているため、集電タブ２８，２９に接続された集電体６０Ａ，６０Ｂと外部端子５０Ａ，５０Ｂとを接続する際の作業性を向上できる。詳しくは、外部端子５０Ａ，５０Ｂの軸部５２及びリベット５３を加締める際に、加締め用の装置が電極体２０に接触しないように簡単に配置できる。しかも、集電タブ２８，２９は、第２折曲部２８ｄ，２９ｄが集電体６０Ａ，６０Ｂの被溶接部６１Ａ，６１Ｂ付近に配置される全長Ｌであるため、集電体６０Ａ，６０Ｂ及び外部端子５０Ａ，５０Ｂの組立性を向上したうえで、可能な限り短く設定されている。よって、通電時の抵抗を可能な限り小さくすることができる。   Further, since the current collecting tabs 28 and 29 are formed with a total length L that can be folded back twice by the end 20a of the electrode body 20, the current collectors 60A and 60B connected to the current collecting tabs 28 and 29 are provided. And the workability when connecting the external terminals 50A and 50B can be improved. Specifically, when the shaft portions 52 and the rivets 53 of the external terminals 50 </ b> A and 50 </ b> B are caulked, the caulking device can be easily arranged so as not to contact the electrode body 20. In addition, the current collecting tabs 28 and 29 have the entire length L in which the second bent portions 28d and 29d are arranged in the vicinity of the welded portions 61A and 61B of the current collectors 60A and 60B, and thus the current collectors 60A and 60B and The external terminals 50A and 50B are set as short as possible after improving the assemblability. Therefore, the resistance during energization can be made as small as possible.

また、集電タブ２８，２９は、膨らみを持たせた第１折曲部２８ｃ，２９ｃにより柔軟性を持たせることができる。よって、組立時及び車載後の走行時等に、集電タブ２８，２９に加わる振動や衝撃を軽減できる。そのため、集電タブ２８，２９に延びや破断が生じることを防止できる。また、集電体６０Ａ，６０Ｂは、逃がし部６６Ａ，６６Ｂの形成により軽量化できるとともに、集電タブ２８，２９と被溶接部６１Ａ，６１Ｂの溶接作業性を確実に向上できる。   Further, the current collecting tabs 28 and 29 can be made flexible by the first bent portions 28c and 29c having bulges. Therefore, vibrations and shocks applied to the current collecting tabs 28 and 29 can be reduced during assembling and running after the vehicle is mounted. Therefore, the current collecting tabs 28 and 29 can be prevented from extending or breaking. Further, the current collectors 60A and 60B can be reduced in weight by the formation of the relief portions 66A and 66B, and the welding workability of the current collecting tabs 28 and 29 and the welded portions 61A and 61B can be reliably improved.

（第２実施形態）
図１５および図１６は第２実施形態の電池１を示す。この第２実施形態では、逃がし部６６Ａ，６６Ｂを被溶接部６１Ａ，６１Ｂの集電タブ２８，２９が突出する方向の基部（非接合部２８ｂ，２９ｂ）側に設け、かつ、集電タブ２８，２９を１回（第１折曲部２８ｃ，２９ｃ）だけ折り曲げるようにした点で、第１実施形態と相違する。第２実施形態の集電体６０Ａ，６０Ｂは、第１実施形態と同様に、幅Ｈ１，Ｈ２が異なる被溶接部６１Ａ，６１Ｂ及び被加締部６２Ａ，６２Ｂが、集電タブ２８，２９が突出する方向と交差する方向に隣接して設けられている。 (Second Embodiment)
15 and 16 show the battery 1 of the second embodiment. In this second embodiment, the relief portions 66A, 66B are provided on the base (non-joined portions 28b, 29b) side in the direction in which the current collecting tabs 28, 29 of the welded portions 61A, 61B protrude, and the current collecting tabs 28 are provided. , 29 is different from the first embodiment in that it is bent only once (first bent portions 28c, 29c). As in the first embodiment, the current collectors 60A and 60B according to the second embodiment include welded portions 61A and 61B and crimped portions 62A and 62B having different widths H1 and H2, and current collector tabs 28 and 29. It is provided adjacent to the direction intersecting the protruding direction.

図１５に示すように、集電タブ２８，２９に集電体６０Ａ，６０Ｂを組み付ける際には、第２直線部２０ｄ側が上方に位置するように電極体２０を横向きに配置し、被加締部６２Ａ，６２Ｂが被溶接部６１Ａ，６１Ｂより下側に位置するように集電体６０Ａ，６０Ｂを配置する。また、逃がし部６６Ａ，６６Ｂ側に電極体２０を配置し、集電タブ２８，２９を集電体６０Ａ，６０Ｂの被溶接部６１Ａ，６１Ｂの下面６１ａ側に配置する。この際、被加締部６２Ａ，６２Ｂ側に位置する逃がし部６６Ａ，６６Ｂの側縁に集電タブ２８，２９が干渉しないように配置する。そして、集電タブ２８，２９を被溶接部６１Ａ，６１Ｂの上面６１ｂ側に超音波溶接により接続する。   As shown in FIG. 15, when assembling the current collectors 60A and 60B to the current collecting tabs 28 and 29, the electrode body 20 is disposed sideways so that the second linear portion 20d side is positioned upward, The current collectors 60A and 60B are arranged so that the parts 62A and 62B are positioned below the welded parts 61A and 61B. Moreover, the electrode body 20 is arrange | positioned at the escape parts 66A and 66B side, and the current collection tabs 28 and 29 are arrange | positioned at the lower surface 61a side of the to-be-welded parts 61A and 61B of the current collectors 60A and 60B. At this time, the current collecting tabs 28 and 29 are arranged so as not to interfere with the side edges of the relief portions 66A and 66B located on the tightened portions 62A and 62B side. Then, the current collecting tabs 28 and 29 are connected to the upper surface 61b side of the welded parts 61A and 61B by ultrasonic welding.

ついで、第１実施形態と同様に、集電タブ２８，２９に接続した集電体６０Ａ，６０Ｂを、上側パッキン７０Ａ，７０Ｂ、外部端子５０Ａ，５０Ｂ及び下側パッキン８０Ａ，８０Ｂを配置した蓋１２の内側面１２ｂに配置し、加締めにより集電体６０Ａ，６０Ｂと外部端子５０Ａ，５０Ｂとを接続する。   Next, as in the first embodiment, the current collectors 60A and 60B connected to the current collecting tabs 28 and 29 are connected to the lid 12 on which the upper packings 70A and 70B, the external terminals 50A and 50B, and the lower packings 80A and 80B are arranged. The current collectors 60A, 60B and the external terminals 50A, 50B are connected by caulking.

ついで、集電タブ２８，２９を基部側（第１直線部２０ｃ上）で９０度折り曲げ、先端側を端部２０ａに沿って第２直線部２０ｄ側に配置する。これにより、電極体２０の端部２０ａに蓋１２が平行に配置される。その後、第１実施形態と同様に、電極体２０と蓋１２との間に上部スペーサ９０を配置した後、外周部に絶縁シート３０を配置する。ついで、ケース本体１１の内部に電極体２０を配置し、ケース本体１１の開口１１ａを蓋１２で密封する。   Next, the current collecting tabs 28 and 29 are bent 90 degrees on the base side (on the first straight portion 20c), and the distal end side is disposed on the second straight portion 20d side along the end portion 20a. Thereby, the lid 12 is arranged in parallel to the end 20a of the electrode body 20. Thereafter, similarly to the first embodiment, after the upper spacer 90 is disposed between the electrode body 20 and the lid 12, the insulating sheet 30 is disposed on the outer peripheral portion. Next, the electrode body 20 is disposed inside the case body 11, and the opening 11 a of the case body 11 is sealed with the lid 12.

このようにした第２実施形態では、第１実施形態と同様に逃がし部６６Ａ，６６Ｂに第１折曲部２８ｃ，２９ｃが配置されるため、同様の作用及び効果を得ることができる。しかも、集電タブ２８，２９の全長Ｌを短くすることができるため、通電時の抵抗を可能な限り小さくすることができる。   In the second embodiment configured as described above, since the first bent portions 28c and 29c are arranged in the escape portions 66A and 66B as in the first embodiment, the same operation and effect can be obtained. Moreover, since the total length L of the current collecting tabs 28 and 29 can be shortened, the resistance during energization can be made as small as possible.

なお、本発明の電池は、前記実施形態の構成に限定されず、種々の変更が可能である。   In addition, the battery of this invention is not limited to the structure of the said embodiment, A various change is possible.

例えば、集電タブ２８，２９は、電極体２０と蓋１２の間において、第１実施形態では２回折り曲げ、第２実施形態では１回だけ折り曲げるようにしたが、３回以上折り曲げるようにしてもよい。即ち、集電体６０Ａ，６０Ｂの集電タブ２８，２９が突出する方向に隣接させて逃がし部６６Ａ，６６Ｂを設け、この逃がし部６６Ａ，６６Ｂに集電タブ２８，２９の第１折曲部２８ｃ，２９ｃを配置する構成とすれば、集電タブ２８，２９の折曲回数は希望に応じて変更可能である。   For example, the current collecting tabs 28 and 29 are bent twice between the electrode body 20 and the lid 12 in the first embodiment and bent only once in the second embodiment, but are bent more than three times. Also good. That is, relief portions 66A and 66B are provided adjacent to each other in the direction in which the current collection tabs 28 and 29 of the current collectors 60A and 60B protrude, and the first bent portions of the current collection tabs 28 and 29 are provided in the relief portions 66A and 66B. If 28c and 29c are arranged, the number of times the current collecting tabs 28 and 29 are bent can be changed as desired.

また、集電体６０Ａ，６０Ｂは、集電タブ２８，２９が突出する方向において、第１実施形態では被溶接部６１Ａ，６１Ｂの先端側に逃がし部６６Ａ，６６Ｂを設け、第２実施形態では被溶接部６１Ａ，６１Ｂの基部側に逃がし部６６Ａ，６６Ｂを設けたが、図１７Ａ，Ｂに示すようにしてもよい。詳しくは、図１７Ａに示すように、逃がし部６６Ａ，６６Ｂは、被溶接部６１Ａ，６１Ｂの先端側と基部側の両方に設けてもよい。また、図１７Ｂに示すように、同一幅の被溶接部６１Ａ，６１Ｂ及び被加締部６２Ａ，６２Ｂを集電タブ２８，２９が突出する方向に偏在させて設け、被溶接部６１Ａ，６１Ｂの先端側又は基部側に逃がし部６６Ａ，６６Ｂを設けてもよい。   Further, the current collectors 60A and 60B are provided with relief portions 66A and 66B on the front end side of the welded portions 61A and 61B in the first embodiment in the direction in which the current collecting tabs 28 and 29 protrude, and in the second embodiment, Although the relief portions 66A and 66B are provided on the base side of the welded portions 61A and 61B, they may be as shown in FIGS. In detail, as shown to FIG. 17A, you may provide escape part 66A, 66B in both the front end side and base part side of to-be-welded part 61A, 61B. Further, as shown in FIG. 17B, welded portions 61A and 61B and crimped portions 62A and 62B having the same width are provided so as to be unevenly distributed in the direction in which the current collecting tabs 28 and 29 protrude, and the welded portions 61A and 61B The relief portions 66A and 66B may be provided on the distal end side or the base side.

また、集電タブ２８，２９に接合する集電体６０Ａ，６０Ｂの被接合部は、溶接による被溶接部６１Ａ，６１Ｂとしたが、加締めにより接合してもよく、電気的に接続できる構成であればよい。   Moreover, although the to-be-joined part of the collectors 60A and 60B joined to the current collection tabs 28 and 29 was set to the to-be-welded parts 61A and 61B by welding, they may be joined by caulking and can be electrically connected. If it is.

また、電極体２０は、集電タブ２８，２９が開口１１ａ側に位置するようにケース本体１１内に収容させたが、集電タブ２８，２９が一方の短側壁部１１ｄ側に位置するようにケース本体１１内に収容させてもよい。この場合、外部端子５０Ａ，５０Ｂをケース本体１１に配置してもよい。   The electrode body 20 is housed in the case body 11 so that the current collecting tabs 28 and 29 are located on the opening 11a side, but the current collecting tabs 28 and 29 are located on the one short side wall portion 11d side. It may be accommodated in the case main body 11. In this case, the external terminals 50 </ b> A and 50 </ b> B may be arranged on the case body 11.

また、本発明は、巻回軸Ａを中心とし、帯状とした正極電極シート２１、負極電極シート２２及びセパレータ２３を巻回した巻回型の電極体２０に限定されず、長方形状とした正極電極シート、負極電極シート及びセパレータをそれぞれ一方向に積層した積層型の電極体にも適用できる。   Further, the present invention is not limited to the wound electrode body 20 around which the belt-shaped positive electrode sheet 21, the negative electrode sheet 22, and the separator 23 are wound with the winding axis A as the center, and the rectangular positive electrode The present invention can also be applied to a laminated electrode body in which an electrode sheet, a negative electrode sheet, and a separator are laminated in one direction.

また、本発明は、リチウムイオン電池を含む非電解質二次電池のような二次電池に限定されず、一次電池、キャパシタを含む種々の蓄電素子に適用できる。   The present invention is not limited to a secondary battery such as a non-electrolyte secondary battery including a lithium ion battery, and can be applied to various power storage elements including a primary battery and a capacitor.

１ 電池（蓄電素子）
１０ 外装体（ケース）
１１ ケース本体
１１ａ 開口
１１ｂ 底壁部
１１ｃ 長側壁部
１１ｄ 短側壁部
１２ 蓋
１２ａ 外側面
１２ｂ 内側面
２０ 電極体
２０ａ 端部
２０ｂ 端部
２０ｃ 第１直線部
２０ｄ 第２直線部
２０ｅ 湾曲部
２１ 正極電極シート
２２ 負極電極シート
２３ セパレータ
２４ 正極金属箔
２４ａ 未塗工部
２４ｂ 突部
２５ 正極活物質層
２６ 負極金属箔
２６ａ 未塗工部
２６ｂ 突部
２７ 負極活物質層
２８ 正極の集電タブ
２８ａ 接合部
２８ｂ 非接合部
２８ｃ 第１折曲部（折曲部）
２８ｄ 第２折曲部
２９ 負極の集電タブ
２９ａ 接合部
２９ｂ 非接合部
２９ｃ 第１折曲部（折曲部）
２９ｄ 第２折曲部
３０ 絶縁シート
４０ 底部スペーサ
５０Ａ，５０Ｂ 外部端子
５１Ａ，５１Ｂ 板状部
５２ 軸部
５２ａ 拡径部
５３ リベット
５３ａ 顎部
５３ｂ 拡径部
６０Ａ，６０Ｂ 集電体
６１Ａ，６１Ｂ 被溶接部（被接合部）
６１ａ 下面
６１ｂ 上面
６２Ａ，６２Ｂ 被加締部（接続部）
６３Ａ，６３Ｂ 縁
６４Ａ，６４Ｂ 段部
６５Ａ，６５Ｂ 貫通孔
６６Ａ，６６Ｂ 逃がし部
７０Ａ，７０Ｂ 上側パッキン
８０Ａ，８０Ｂ 下側パッキン
９０ 上部スペーサ
９１ 中央部
９１ａ 開口
９２Ａ，９２Ｂ 集電体収容部
９３Ａ，９３Ｂ 側壁部
９４Ａ，９４Ｂ 上壁部
９４ａ 先端
９５Ａ，９５Ｂ 下壁部
９５ａ 先端
９６Ａ，９６Ｂ 挿通溝
９７Ａ，９７Ｂ 被加締部配置部
９７ａ 底壁部
９７ｂ 内側周壁部
９７ｃ 外側周壁部
９８Ａ，９８Ｂ 開口部
１００ 治具
Ａ 巻回軸
Ｂ 中心線
Ｃ１，Ｃ２ 折曲位置 1 Battery (storage element)
10 Exterior body (case)
DESCRIPTION OF SYMBOLS 11 Case main body 11a Opening 11b Bottom wall part 11c Long side wall part 11d Short side wall part 12 Lid 12a Outer side surface 12b Inner side surface 20 Electrode body 20a End part 20b End part 20c 1st linear part 20d 2nd linear part 20e Curved part 21 Positive electrode Sheet 22 Negative electrode sheet 23 Separator 24 Positive electrode metal foil 24a Uncoated part 24b Protrusion 25 Positive electrode active material layer 26 Negative electrode metal foil 26a Uncoated part 26b Protrusion 27 Negative electrode active material layer 28 Positive electrode current collecting tab 28a Joining part 28b Non-joint part 28c 1st bending part (bending part)
28d Second bent portion 29 Negative electrode current collecting tab 29a Joined portion 29b Non-joined portion 29c First bent portion (bent portion)
29d Second bent portion 30 Insulating sheet 40 Bottom spacer 50A, 50B External terminal 51A, 51B Plate-like portion 52 Shaft portion 52a Expanded portion 53 Rivet 53a Jaw portion 53b Expanded portion 60A, 60B Current collector 61A, 61B Welded Part (joined part)
61a Lower surface 61b Upper surface 62A, 62B Clamped part (connection part)
63A, 63B Edge 64A, 64B Step part 65A, 65B Through hole 66A, 66B Relief part 70A, 70B Upper packing 80A, 80B Lower packing 90 Upper spacer 91 Central part 91a Opening 92A, 92B Current collector housing part 93A, 93B Side wall Part 94A, 94B Upper wall part 94a Tip 95A, 95B Lower wall part 95a Tip 96A, 96B Insertion groove 97A, 97B Clamped part arrangement part 97a Bottom wall part 97b Inner peripheral wall part 97c Outer peripheral wall part 98A, 98B Opening part 100 Tool A Winding axis B Center line C1, C2 Bending position

Claims (6)

正極電極シートと負極電極シートとをセパレータを介在させて交互に積層してなり、前記各電極シートの端部から突出する突部が互いに重ね合わされてなる正極集電タブ及び負極集電タブを有し、前記各集電タブが前記端部に沿って延びるように折り曲げられてケース内に収容された電極体と、
前記ケースに配置された外部端子と、
前記集電タブが接合された被接合部と、前記外部端子に接続されるとともに前記被接合部に対して前記集電タブが突出する方向と交差する方向に隣接して設けられた接続部と、前記被接合部の前記集電タブが突出する方向に隣接して設けられた逃がし部とを有し、前記逃がし部に前記集電タブの折曲部が位置する集電体と
を備える、蓄電素子。 The positive electrode sheet and the negative electrode sheet are formed by alternately laminating positive electrode sheets and negative electrode sheets with separators interposed therebetween, and protrusions protruding from the ends of the electrode sheets are overlapped with each other. And an electrode body that is bent so that each of the current collecting tabs extends along the end portion and is accommodated in the case,
An external terminal disposed in the case;
A joined portion to which the current collecting tab is joined, and a connecting portion that is connected to the external terminal and adjacent to the joined portion in a direction intersecting with the direction in which the current collecting tab protrudes. An escape portion provided adjacent to a direction in which the current collector tab of the joined portion protrudes, and a current collector in which a bent portion of the current collector tab is located in the escape portion. Power storage element. 前記電極体は、前記正極電極シートと前記負極電極シートとの間に前記セパレータが介在するように重ね合わせて巻回軸回りに巻回し、前記巻回軸が延びる方向から見た前記端部が、互いに対向する一対の直線部と、これらの直線部を接続するように互いに対向する一対の湾曲部とを有する長円状であり、
前記一対の直線部のうち一方側の第１直線部に、前記正極集電タブ及び前記負極集電タブが前記第１直線部が延びる方向に沿って間隔をあけて配置され、前記一対の直線部のうち他方側の第２直線部に向けて前記各集電タブが折り曲げられている、請求項１に記載の蓄電素子。 The electrode body is wound around the winding axis so that the separator is interposed between the positive electrode sheet and the negative electrode sheet, and the end portion viewed from the direction in which the winding axis extends is An ellipse having a pair of straight portions facing each other and a pair of curved portions facing each other so as to connect the straight portions;
The positive electrode current collecting tab and the negative electrode current collecting tab are arranged on the first straight line portion on one side of the pair of straight line portions at intervals along the direction in which the first straight line portion extends, and the pair of straight lines The electric storage element according to claim 1, wherein each of the current collecting tabs is bent toward the second linear portion on the other side of the portion. 前記被接合部の前記集電タブが突出する方向の幅は、前記接続部の幅より狭く、前記被接合部の前記集電タブが突出する方向に隣接して形成される空間により前記逃がし部が形成されている、請求項１又は請求項２に記載の蓄電素子。   The width of the joined portion in the direction in which the current collecting tab protrudes is narrower than the width of the connecting portion, and the escape portion is formed by a space formed adjacent to the direction in which the current collecting tab in the joined portion protrudes. The electricity storage device according to claim 1 or 2, wherein is formed. 前記逃がし部は、前記被接合部の前記集電タブが突出する方向の先端側に設けた切り欠きである、請求項３に記載の蓄電素子。   The electric storage element according to claim 3, wherein the escape portion is a notch provided on a distal end side of the joined portion in a direction in which the current collecting tab protrudes. 前記逃がし部は、前記被接合部の前記集電タブが突出する方向の基部側に設けた切り欠きである、請求項３に記載の蓄電素子。   The electric storage element according to claim 3, wherein the escape portion is a notch provided on a base portion side of the joined portion in a direction in which the current collecting tab protrudes. 前記集電タブは前記集電体の下面に接続されており、かつ、前記集電タブの前記折曲部の上側頂部は前記集電体の前記下面よりも上側に達している、請求項１乃至請求項５のいずれか１項に記載の蓄電素子。   The current collector tab is connected to a lower surface of the current collector, and an upper top portion of the bent portion of the current collector tab reaches an upper side than the lower surface of the current collector. The electrical storage element of any one of thru | or 5 thru | or 5.
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WO2022196938A1 (en) * 2021-03-18 2022-09-22 삼성에스디아이(주) Secondary battery
CN115173001A (en) * 2022-06-16 2022-10-11 中国第一汽车股份有限公司 Novel tab structure, battery and processing method thereof
WO2023283887A1 (en) * 2021-07-15 2023-01-19 宁德新能源科技有限公司 Electrochemical apparatus and electronic apparatus comprising said electrochemical device
WO2023070591A1 (en) * 2021-10-29 2023-05-04 宁德新能源科技有限公司 Electrochemical apparatus and electrical device
CN116365181A (en) * 2023-05-31 2023-06-30 深圳海辰储能控制技术有限公司 Energy storage device and electric equipment

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013161756A (en) * 2012-02-08 2013-08-19 Toyota Industries Corp Electricity storage device and vehicle
WO2014034413A1 (en) * 2012-08-28 2014-03-06 株式会社 豊田自動織機 Electricity storage device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013161756A (en) * 2012-02-08 2013-08-19 Toyota Industries Corp Electricity storage device and vehicle
WO2014034413A1 (en) * 2012-08-28 2014-03-06 株式会社 豊田自動織機 Electricity storage device

Cited By (26)

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JP2018006112A (en) * 2016-06-30 2018-01-11 株式会社豊田自動織機 Power storage device
JP2018107009A (en) * 2016-12-27 2018-07-05 株式会社豊田自動織機 Power storage device
CN113039662A (en) * 2018-12-19 2021-06-25 三洋电机株式会社 Electrode plate for secondary battery and secondary battery using the same
WO2020130000A1 (en) 2018-12-19 2020-06-25 三洋電機株式会社 Secondary battery electrode plate and secondary battery using same
WO2020130001A1 (en) 2018-12-19 2020-06-25 三洋電機株式会社 Electrode plate for secondary batteries, and secondary battery using same
WO2020129999A1 (en) 2018-12-19 2020-06-25 三洋電機株式会社 Electrode plate for secondary cell, and secondary cell using same
WO2020129880A1 (en) 2018-12-19 2020-06-25 三洋電機株式会社 Secondary battery and manufacturing method therefor
US11978895B2 (en) 2018-12-19 2024-05-07 Sanyo Electric Co., Ltd. Secondary battery electrode plate comprising a protrusion and secondary battery using the same
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WO2020137715A1 (en) 2018-12-27 2020-07-02 三洋電機株式会社 Electrode plate and secondary battery using same
JP2020107513A (en) * 2018-12-27 2020-07-09 三洋電機株式会社 Secondary battery
CN113169428A (en) * 2018-12-27 2021-07-23 三洋电机株式会社 Secondary battery
WO2020137714A1 (en) 2018-12-27 2020-07-02 三洋電機株式会社 Secondary battery
CN113169428B (en) * 2018-12-27 2023-03-28 三洋电机株式会社 Secondary battery
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JP7300266B2 (en) 2018-12-27 2023-06-29 三洋電機株式会社 secondary battery
CN111384354B (en) * 2018-12-27 2024-01-19 三洋电机株式会社 Secondary battery
WO2020170598A1 (en) 2019-02-20 2020-08-27 三洋電機株式会社 Electrode plate and method for manufacturing same, and secondary battery and method for manufacturing same
JP7346856B2 (en) 2019-03-14 2023-09-20 株式会社Ｇｓユアサ Energy storage element and its manufacturing method
JP2020149896A (en) * 2019-03-14 2020-09-17 株式会社Ｇｓユアサ Power storage element and method for manufacturing the same
WO2022196938A1 (en) * 2021-03-18 2022-09-22 삼성에스디아이(주) Secondary battery
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