JP6769137B2 - Power storage device - Google Patents

Power storage device Download PDF

Info

Publication number
JP6769137B2
JP6769137B2 JP2016130161A JP2016130161A JP6769137B2 JP 6769137 B2 JP6769137 B2 JP 6769137B2 JP 2016130161 A JP2016130161 A JP 2016130161A JP 2016130161 A JP2016130161 A JP 2016130161A JP 6769137 B2 JP6769137 B2 JP 6769137B2
Authority
JP
Japan
Prior art keywords
electrode assembly
stacking direction
tab
welded portion
tabs
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
JP2016130161A
Other languages
Japanese (ja)
Other versions
JP2018006114A (en
Inventor
泰亮 竹中
泰亮 竹中
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyota Industries Corp
Original Assignee
Toyota Industries Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toyota Industries Corp filed Critical Toyota Industries Corp
Priority to JP2016130161A priority Critical patent/JP6769137B2/en
Publication of JP2018006114A publication Critical patent/JP2018006114A/en
Application granted granted Critical
Publication of JP6769137B2 publication Critical patent/JP6769137B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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

Landscapes

  • Electric Double-Layer Capacitors Or The Like (AREA)
  • Secondary Cells (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Description

本発明は、蓄電装置に関する。 The present invention relates to a power storage device.

二次電池や、キャパシタなどの蓄電装置としては、例えば、特許文献１に開示されている。特許文献１の蓄電装置は、タブ群を有する電極組立体と、電極組立体が収容されるケースと、ケースに固定された電極端子と、タブ群と電極端子とを電気的に接続する導電部材とを備える。電極組立体は、極性の異なる電極同士を互いに絶縁した状態で積層して構成されている。電極は、一辺から突出するタブを備える。タブは、複数寄せ集められることでタブ群を構成している。複数のタブは、電極組立体における電極の積層方向一端に寄せ集められ、電極組立体における電極の積層方向他端に向けて曲げられている。タブ群の先端が導電部材に接合されることで、タブ群と電極端子とが電気的に接続されている。 As a power storage device such as a secondary battery or a capacitor, for example, Patent Document 1 discloses it. The power storage device of Patent Document 1 is a conductive member that electrically connects an electrode assembly having a tab group, a case in which the electrode assembly is housed, an electrode terminal fixed to the case, and the tab group and the electrode terminal. And. The electrode assembly is configured by laminating electrodes having different polarities in a state of being insulated from each other. The electrode comprises a tab protruding from one side. A group of tabs is formed by collecting a plurality of tabs. The plurality of tabs are gathered at one end in the stacking direction of the electrodes in the electrode assembly and bent toward the other end in the stacking direction of the electrodes in the electrode assembly. By joining the tip of the tab group to the conductive member, the tab group and the electrode terminal are electrically connected.

特開２００２−２９８８２５号公報JP-A-2002-298825

ところで、電極組立体における電極の積層方向一端にタブを寄せ集めると、タブ群の先端や、タブ群を曲げる曲げ部がケースに近くなり、タブ群とケースとが接触しやすい。
本発明の目的は、タブ群とケースとの接触を抑制できる蓄電装置を提供することにある。 By the way, when the tabs are gathered at one end in the stacking direction of the electrodes in the electrode assembly, the tip of the tab group and the bent portion for bending the tab group become close to the case, and the tab group and the case easily come into contact with each other.
An object of the present invention is to provide a power storage device capable of suppressing contact between a tab group and a case.

上記課題を解決する蓄電装置は、一辺から突出した形状のタブを有する電極が、異なる極性の電極同士を互いに絶縁した状態で積層され、同じ極性同士の前記タブを寄せ集めて積層したタブ群を含む電極組立体と、前記電極組立体が収容されたケースと、前記ケースに固定され、前記電極組立体と電気を授受する電極端子と、前記タブ群と前記電極端子とを電気的に接続する平板状の導電部材と、を備え、前記タブ群は、同じ極性同士で寄せ集めて積層された前記タブ同士を溶接した第１溶接部と、前記第１溶接部よりも先端側に位置し、少なくとも１つのタブと前記導電部材とを溶接した第２溶接部と、前記電極組立体における前記電極の積層方向の一端に向けて前記第１溶接部から延びる第１延設部と、前記第１延設部に連続し、前記電極組立体における前記電極の積層方向の他端に向けて前記タブ群を折り返す曲げ部と、前記曲げ部から前記第２溶接部に向けて延びる第２延設部と、を備え、前記一辺の延びる方向に見て、前記第１溶接部の一部は、前記電極組立体における前記電極の積層方向の中心線に重なり、前記導電部材の縁のうち、前記電極の積層方向の一端側の縁から前記第２溶接部までの寸法を２倍した値よりも、前記タブの突出方向における前記第１溶接部と前記第２溶接部との間の寸法の値は小さい。 In the power storage device that solves the above problems, electrodes having tabs having a shape protruding from one side are laminated in a state where electrodes having different polarities are insulated from each other, and the tabs having the same polarity are gathered and laminated. The electrode assembly including the electrode assembly, the case in which the electrode assembly is housed, the electrode terminal fixed to the case and transmitting and receiving electricity to and from the electrode assembly, and the tab group and the electrode terminal are electrically connected. The tab group is provided with a flat plate-shaped conductive member, and the tab group is located at the first welded portion where the tabs that are laminated together with the same polarity are welded to each other and the tip side of the first welded portion. A second welded portion in which at least one tab and the conductive member are welded, a first extended portion extending from the first welded portion toward one end in the stacking direction of the electrodes in the electrode assembly, and the first A bent portion that is continuous with the extended portion and folds the tab group toward the other end in the stacking direction of the electrodes in the electrode assembly, and a second extended portion that extends from the bent portion toward the second welded portion. When provided with, as seen in the direction of extension of the side, wherein a portion of the first weld, the electrode assembly Ri Do heavy to the center line in the stacking direction of the electrode in the body, among the edges of the conductive member, The dimension between the first welded portion and the second welded portion in the protruding direction of the tab is larger than the value obtained by doubling the dimension from the edge on one end side in the stacking direction of the electrodes to the second welded portion. The value is small .

これによれば、第１溶接部によってタブ群を構成する全てのタブを電極の積層方向の中心寄りに寄せ集めることができる。一辺からのタブの突出長を同一とした場合、電極組立体における電極の積層方向の一端に寄せ集めたタブ群を電極組立体における電極の積層方向の他方に向けて曲げる場合に比べて、曲げ部、及び、タブ群の突出方向の先端をケースから離すことができる。このため、タブ群とケースとの接触を抑制することができる。
また、導電部材の板厚方向に対向する領域内にタブ群が収まりやすい。 According to this, all the tabs forming the tab group by the first welded portion can be gathered toward the center in the stacking direction of the electrodes. If the same projection length of the tab from one side, as compared with a case of bending toward the tab group of gathered in the stacking direction of the one end of the electrode in the electrode assembly to the other in the stacking direction of the electrode in the electrode assembly, bending The tip of the portion and the tab group in the protruding direction can be separated from the case. Therefore, contact between the tab group and the case can be suppressed.
In addition, the tab group is likely to fit in the region of the conductive member facing in the plate thickness direction.

上記蓄電装置について、前記第１溶接部における前記タブの積層方向の中心線は、前記電極組立体における前記電極の積層方向の中心線と重なってもよい。
これによれば、タブを電極組立体における電極の積層方向の中心に寄せ集めることで、曲げ部とケースとの距離をより離すことができる。 Regarding the power storage device, the center line in the stacking direction of the tabs in the first welded portion may overlap with the center line in the stacking direction of the electrodes in the electrode assembly.
According to this, by gathering the tabs close to the center of the electrode assembly in the stacking direction, the distance between the bent portion and the case can be further increased.

本発明によれば、タブ群とケースとの接触を抑制できる。 According to the present invention, the contact between the tab group and the case can be suppressed.

実施形態における二次電池の分解斜視図。An exploded perspective view of the secondary battery in the embodiment. 実施形態における電極、及び、セパレータの斜視図。The perspective view of the electrode and the separator in an embodiment. 実施形態におけるタブ群を示す二次電池の断面図。The cross-sectional view of the secondary battery which shows the tab group in an embodiment. 実施形態におけるタブ群を構成するときの工程を示す図。The figure which shows the process at the time of forming a tab group in an embodiment. 実施形態におけるタブ群を構成するときの工程を示す図。The figure which shows the process at the time of forming a tab group in an embodiment. 実施形態におけるタブ群を構成するときの工程を示す図。The figure which shows the process at the time of forming a tab group in an embodiment. 比較例のタブ群を示す二次電池の断面図。The cross-sectional view of the secondary battery which shows the tab group of the comparative example.

以下、蓄電装置の一実施形態について説明する。
図１に示すように、蓄電装置としての二次電池１０は、直方体状のケース１１を備える。ケース１１は、有底四角筒状のケース本体１２と、ケース本体１２の開口部を塞ぐ蓋１３とを備える。ケース１１は、金属製であり、例えば、アルミニウム製又はアルミニウム合金製である。二次電池１０は、リチウムイオン二次電池や、ニッケル水素二次電池など、どのような二次電池１０であってもよい。また、蓄電装置はキャパシタであってもよい。 Hereinafter, an embodiment of the power storage device will be described.
As shown in FIG. 1, the secondary battery 10 as a power storage device includes a rectangular parallelepiped case 11. The case 11 includes a bottomed square tubular case body 12 and a lid 13 that closes the opening of the case body 12. The case 11 is made of metal, for example, made of aluminum or an aluminum alloy. The secondary battery 10 may be any secondary battery 10, such as a lithium ion secondary battery or a nickel hydrogen secondary battery. Further, the power storage device may be a capacitor.

二次電池１０は、ケース１１に収容された電極組立体２０と、電極組立体２０と電気の授受を行う二つの電極端子１４とを備える。二つの電極端子１４は、極性の異なる正極端子と負極端子である。電極端子１４は絶縁リング１５を介して蓋１３に固定されている。二次電池１０は、導電部材１６を二つ備える。各導電部材１６は、それぞれ、各電極端子１４に接合されている。 The secondary battery 10 includes an electrode assembly 20 housed in a case 11 and two electrode terminals 14 that exchange electricity with the electrode assembly 20. The two electrode terminals 14 are a positive electrode terminal and a negative electrode terminal having different polarities. The electrode terminal 14 is fixed to the lid 13 via an insulating ring 15. The secondary battery 10 includes two conductive members 16. Each conductive member 16 is joined to each electrode terminal 14.

図２に示すように、電極組立体２０は、正負の電極２１と、正負の電極２１の間に位置するセパレータ２３とを備える。正負の電極２１は、セパレータ２３によって相互に絶縁された状態で積層されている。セパレータ２３は、長方形状である。なお、以下の説明において、「積層方向」とは、電極２１の積層方向である。 As shown in FIG. 2, the electrode assembly 20 includes a positive and negative electrode 21 and a separator 23 located between the positive and negative electrodes 21. The positive and negative electrodes 21 are laminated in a state of being insulated from each other by the separator 23. The separator 23 has a rectangular shape. In the following description, the "stacking direction" is the stacking direction of the electrodes 21.

正負の電極２１は、金属箔２４を備える。正極の電極２１の金属箔２４は、例えばアルミニウム箔である。負極の電極２１の金属箔２４は、例えば銅箔である。金属箔２４は、長方形状の本体部２５と、本体部２５の一辺２５ａから突出した形状のタブ３０と、を備える。なお、本体部２５は、一辺２５ａを備える形状であればどのような形状であってもよい。本体部２５の一辺２５ａは、電極２１の一辺でもある。よって、電極２１は、一辺２５ａから突出するタブ３０を有する。 The positive and negative electrodes 21 include a metal foil 24. The metal foil 24 of the positive electrode 21 is, for example, an aluminum foil. The metal foil 24 of the electrode 21 of the negative electrode is, for example, a copper foil. The metal foil 24 includes a rectangular main body portion 25 and a tab 30 having a shape protruding from one side 25a of the main body portion 25. The main body 25 may have any shape as long as it has a side 25a. One side 25a of the main body 25 is also one side of the electrode 21. Therefore, the electrode 21 has a tab 30 protruding from one side 25a.

正負の電極２１は、本体部２５の両面に、活物質層２６を備える。活物質層２６は、それぞれの極性用の活物質、バインダ、及び導電助剤などを含有している。なお、正負の電極２１は、本体部２５の片面にのみ活物質層２６を備えていてもよい。 The positive and negative electrodes 21 are provided with active material layers 26 on both sides of the main body 25. The active material layer 26 contains an active material for each polarity, a binder, a conductive auxiliary agent, and the like. The positive and negative electrodes 21 may be provided with the active material layer 26 only on one side of the main body 25.

電極組立体２０において、複数の電極２１とセパレータ２３とは、同じ極性のタブ３０同士が積層方向に列状に配置される状態で積層されている。
図１及び図３に示すように、同じ極性のタブ３０同士は、電極組立体２０における積層方向の中心寄りに寄せ集められている。寄せ集められたタブ３０は、タブ群３１，３２を構成している。すなわち、電極組立体２０は、極性の異なる二つのタブ群３１，３２を備える。各タブ群３１，３２は、それぞれの極性の電極端子１４に接合された導電部材１６に溶接されている。導電部材１６は、電極端子１４に対向する位置からタブ群３１，３２に対向する位置まで延びる平板状であり、矩形状である。なお、平板状とは導電部材１６の一部を折り返すように導電部材１６を屈曲させている形状を含まず、導電部材１６に存在する起伏など、僅かに湾曲している形状を含む形状である。導電部材１６の板厚方向の一方の面には電極端子１４が接合され、板厚方向の他方の面にはタブ群３１，３２が溶接されている。 In the electrode assembly 20, the plurality of electrodes 21 and the separator 23 are laminated in a state in which tabs 30 having the same polarity are arranged in a row in the stacking direction.
As shown in FIGS. 1 and 3, the tabs 30 having the same polarity are gathered toward the center of the electrode assembly 20 in the stacking direction. The tabs 30 gathered together form tab groups 31 and 32. That is, the electrode assembly 20 includes two tab groups 31 and 32 having different polarities. The tab groups 31 and 32 are welded to the conductive member 16 joined to the electrode terminals 14 having the respective polarities. The conductive member 16 has a flat plate shape and a rectangular shape extending from a position facing the electrode terminals 14 to a position facing the tab groups 31 and 32. The flat plate shape does not include a shape in which the conductive member 16 is bent so as to fold a part of the conductive member 16, but includes a shape that is slightly curved such as undulations existing in the conductive member 16. .. An electrode terminal 14 is joined to one surface of the conductive member 16 in the plate thickness direction, and tab groups 31 and 32 are welded to the other surface in the plate thickness direction.

二次電池１０は、各導電部材１６と、蓋１３とを絶縁する絶縁カバー４０をケース１１内に備える。絶縁カバー４０は、例えば樹脂製である。絶縁カバー４０は、長方形板状の第１絶縁部４１と、この第１絶縁部４１の一つの長縁から電極組立体２０に向けて突出した形状の第２絶縁部４２とを備える。 The secondary battery 10 includes an insulating cover 40 that insulates each conductive member 16 and the lid 13 in the case 11. The insulating cover 40 is made of, for example, resin. The insulating cover 40 includes a rectangular plate-shaped first insulating portion 41 and a second insulating portion 42 having a shape protruding from one long edge of the first insulating portion 41 toward the electrode assembly 20.

第１絶縁部４１は、導電部材１６と、蓋１３との間に介在する。第２絶縁部４２は、積層方向において、各タブ群３１，３２と、ケース本体１２の側壁との間に位置する。
また、二次電池１０は、電極組立体２０と、ケース１１とを絶縁するための絶縁フィルム４３をケース１１内に備える。絶縁フィルム４３は、例えば、ケース本体１２における底部の内面、及び、ケース本体１２における側壁の内面のうち、電極２１に対向する位置に設けられる。 The first insulating portion 41 is interposed between the conductive member 16 and the lid 13. The second insulating portion 42 is located between the tab groups 31 and 32 and the side wall of the case body 12 in the stacking direction.
Further, the secondary battery 10 includes an insulating film 43 for insulating the electrode assembly 20 and the case 11 in the case 11. The insulating film 43 is provided, for example, at a position facing the electrode 21 on the inner surface of the bottom portion of the case body 12 and the inner surface of the side wall of the case body 12.

次に、タブ群３１，３２について詳細に説明する。以下、タブ群３１，３２のうち一方のタブ群３１について説明する。
図３に示すように、タブ群３１は、タブ３０同士を溶接した第１溶接部３３を備える。電極組立体２０において、タブ群３１が突出している面を端面２０ａとし、タブ群３１の突出方向において、タブ群３１の端面２０ａ寄りの端部を基端、逆側の端部を先端とする。第１溶接部３３は、基端寄りに位置している。 Next, the tab groups 31 and 32 will be described in detail. Hereinafter, one of the tab groups 31 and 32, the tab group 31, will be described.
As shown in FIG. 3, the tab group 31 includes a first welded portion 33 in which the tabs 30 are welded to each other. In the electrode assembly 20, the surface on which the tab group 31 protrudes is defined as the end surface 20a, and in the projecting direction of the tab group 31, the end portion closer to the end surface 20a of the tab group 31 is used as the base end, and the opposite end portion is used as the tip end. .. The first weld 33 is located closer to the base end.

タブ群３１において、第１溶接部３３より先端側は曲げられている。タブ群３１は、第１溶接部３３から電極組立体２０における積層方向一端に向けて延びる第１延設部３４と、第１延設部３４に連続し、タブ群３１を折り返す曲げ部３５と、曲げ部３５より蓋１３側で曲げ部３５から電極組立体２０における積層方向他端に向けて延びる第２延設部３６とを備える。一辺２５ａからのタブ３０の突出長が全ての電極２１で同一なので、第２延設部３６においては、積層方向の中心に近い電極２１のタブ３０ほど、曲げ部３５から電極組立体２０における積層方向他端に向けて突出している。積層方向において、第１延設部３４と第２延設部３６の寸法とは略同一である。 In the tab group 31, the tip side of the first welded portion 33 is bent. The tab group 31 includes a first extending portion 34 extending from the first welding portion 33 toward one end in the stacking direction in the electrode assembly 20, and a bending portion 35 continuous with the first extending portion 34 and folding back the tab group 31. A second extending portion 36 extending from the bending portion 35 toward the other end in the stacking direction in the electrode assembly 20 is provided on the lid 13 side of the bending portion 35. Since the protruding length of the tab 30 from the side 25a is the same for all the electrodes 21, in the second extending portion 36, the tab 30 of the electrode 21 closer to the center in the stacking direction is laminated from the bent portion 35 to the electrode assembly 20. It protrudes toward the other end in the direction. In the stacking direction, the dimensions of the first extension portion 34 and the second extension portion 36 are substantially the same.

タブ群３１は、導電部材１６と溶接された第２溶接部３７を第２延設部３６に備える。第２溶接部３７は、タブ群３１の先端に位置している。第２溶接部３７は、複数のタブ３０のうち、少なくとも一つのタブ３０を導電部材１６に溶接した構成である。本実施形態において、第２溶接部３７は三つのタブ３０を導電部材１６に溶接している。第２溶接部３７は、導電部材１６における積層方向の中心にタブ群３１を溶接している。 The tab group 31 includes a second welded portion 37 welded to the conductive member 16 in the second extending portion 36. The second weld 37 is located at the tip of the tab group 31. The second welded portion 37 has a configuration in which at least one of the plurality of tabs 30 is welded to the conductive member 16. In the present embodiment, the second welded portion 37 has three tabs 30 welded to the conductive member 16. The second welded portion 37 welds the tab group 31 to the center of the conductive member 16 in the stacking direction.

一辺２５ａが延びる方向に見て、第１溶接部３３の一部は、電極組立体２０における積層方向の中心線Ｌ１に重なる。本実施形態においては第１溶接部３３における積層方向の中心線Ｌ２と、電極組立体２０における積層方向の中心線Ｌ１とは重なり合う。導電部材１６のうち積層方向の寸法を幅とすると、タブ群３１は導電部材１６の幅内に収まっている。すなわち、導電部材１６の板厚方向において、その導電部材１６に対向する領域内にタブ群３１は位置している。 When viewed in the direction in which one side 25a extends, a part of the first welded portion 33 overlaps the center line L1 in the stacking direction in the electrode assembly 20. In the present embodiment, the center line L2 in the stacking direction in the first welded portion 33 and the center line L1 in the stacking direction in the electrode assembly 20 overlap. Assuming that the width of the conductive member 16 in the stacking direction is the width, the tab group 31 is within the width of the conductive member 16. That is, the tab group 31 is located in the region facing the conductive member 16 in the plate thickness direction of the conductive member 16.

導電部材１６の縁のうち、電極組立体２０における積層方向一端側の縁１６ａから第２溶接部３７までの寸法をＡとし、タブ３０の突出方向における第１溶接部３３と第２溶接部３７との間の寸法（中心間距離）をＢとすると、ＡとＢとは、２Ａ＞Ｂの関係を満たす。すなわち、導電部材１６の縁１６ａから第２溶接部３７までの寸法を２倍した値よりも、タブ３０の突出方向における第１溶接部３３と第２溶接部３７との間の寸法の値は小さい。なお、図５に示すように、Ｂは、タブ群３１を直線状にしたときの第１溶接部３３と第２溶接部３７との間の寸法ともいえる。 Of the edges of the conductive member 16, the dimension from the edge 16a on one end side in the stacking direction to the second weld 37 in the electrode assembly 20 is A, and the first weld 33 and the second weld 37 in the protruding direction of the tab 30 Assuming that the dimension between and (distance between centers) is B, A and B satisfy the relationship of 2A> B. That is, the value of the dimension between the first welded portion 33 and the second welded portion 37 in the protruding direction of the tab 30 is larger than the value obtained by doubling the dimension from the edge 16a of the conductive member 16 to the second welded portion 37. small. As shown in FIG. 5, B can be said to be the dimension between the first welded portion 33 and the second welded portion 37 when the tab group 31 is linearized.

二つのタブ群３１，３２のうち、タブ群３２は、タブ群３１と同様な構造、あるいは、タブ群３１の対称構造となる。タブ群３２が、タブ群３１の対称構造となる場合、第１延設部３４と第２延設部３６の延びる方向が、積層方向においてタブ群３１とは逆方向となる。 Of the two tab groups 31 and 32, the tab group 32 has a structure similar to that of the tab group 31 or a symmetrical structure of the tab group 31. When the tab group 32 has a symmetrical structure of the tab group 31, the extending direction of the first extending portion 34 and the second extending portion 36 is opposite to that of the tab group 31 in the stacking direction.

図４に示すように、複数のタブ３０からタブ群３１を構成する際には、まず、同じ極性のタブ３０同士を電極組立体２０における積層方向の中心に寄せ集める。寄せ集めた複数のタブ３０にレーザを照射することで第１溶接部３３を形成し、第１溶接部３３でタブ３０同士を接合する。 As shown in FIG. 4, when forming the tab group 31 from the plurality of tabs 30, first, the tabs 30 having the same polarity are brought together at the center of the electrode assembly 20 in the stacking direction. The first welded portion 33 is formed by irradiating the plurality of tabs 30 gathered together with a laser, and the tabs 30 are joined to each other at the first welded portion 33.

図５に示すように、タブ３０の積層方向に重なるように導電部材１６を配置する。タブ３０の先端にレーザを照射して、第２溶接部３７を形成し、導電部材１６とタブ３０とを溶接する。 As shown in FIG. 5, the conductive members 16 are arranged so as to overlap each other in the stacking direction of the tabs 30. The tip of the tab 30 is irradiated with a laser to form a second welded portion 37, and the conductive member 16 and the tab 30 are welded to each other.

図６に示すように、導電部材１６の板厚方向の一面が電極組立体２０の端面２０ａと向かい合うように導電部材１６を位置させる。すると、第１溶接部３３と第２溶接部３７との間で複数のタブ３０が曲がり、曲げ部３５、第１延設部３４、及び、第２延設部３６が形成される。 As shown in FIG. 6, the conductive member 16 is positioned so that one surface of the conductive member 16 in the plate thickness direction faces the end surface 20a of the electrode assembly 20. Then, a plurality of tabs 30 are bent between the first welded portion 33 and the second welded portion 37, and the bent portion 35, the first extension portion 34, and the second extension portion 36 are formed.

複数のタブ３０を曲げる際に、第１溶接部３３と第２溶接部３７との距離が長い程、複数のタブ３０を曲げやすい。第２溶接部３７は、複数のタブ３０を曲げることができる範囲内で、その位置をタブ群３１の基端側に変更してもよいが、タブ３０の先端側に近い程、タブ３０を曲げやすい。 When bending the plurality of tabs 30, the longer the distance between the first welded portion 33 and the second welded portion 37, the easier it is to bend the plurality of tabs 30. The position of the second welded portion 37 may be changed to the base end side of the tab group 31 within a range in which the plurality of tabs 30 can be bent, but the closer the tab 30 is to the tip end side, the closer the tab 30 is. Easy to bend.

次に、本実施形態の二次電池１０の作用、効果について説明する。まず、比較例の二次電池について説明する。
図７に示すように、比較例の二次電池１００は、タブ群１０１の形状、及び、導電部材１１０の形状を除いて、実施形態の二次電池１０と同一の構成を備える。 Next, the operation and effect of the secondary battery 10 of the present embodiment will be described. First, the secondary battery of the comparative example will be described.
As shown in FIG. 7, the secondary battery 100 of the comparative example has the same configuration as the secondary battery 10 of the embodiment except for the shape of the tab group 101 and the shape of the conductive member 110.

比較例のタブ群１０１は、複数のタブ３０を電極組立体２０における積層方向一端（図中左方）に寄せ集め、電極組立体２０における積層方向他端（図中右方）に向けて曲げた形状である。この場合、曲げ部１０２は電極組立体２０における積層方向一端に寄る。また、タブ群１０１の先端は電極組立体２０における積層方向他端に寄る。曲げ部１０２、及び、タブ群１０１の先端は積層方向に位置するケース本体１２の側壁に近くなる。タブ群１０１の曲げ部１０２がケース１１に接触することは、絶縁カバー４０によって抑制されている。 In the tab group 101 of the comparative example, a plurality of tabs 30 are gathered at one end in the stacking direction (left in the figure) of the electrode assembly 20 and bent toward the other end in the stacking direction (right in the figure) of the electrode assembly 20. Shape. In this case, the bent portion 102 is closer to one end in the stacking direction in the electrode assembly 20. Further, the tip of the tab group 101 is closer to the other end of the electrode assembly 20 in the stacking direction. The tips of the bent portion 102 and the tab group 101 are close to the side wall of the case body 12 located in the stacking direction. The contact of the bent portion 102 of the tab group 101 with the case 11 is suppressed by the insulating cover 40.

導電部材１１０は、板状の金属板を折り返すことで、板厚方向に互いに対向する第１導電部１１１及び第２導電部１１２と、第１導電部１１１と第２導電部１１２とに連続する連続部１１３を備える。そして、タブ群１０１の先端は、第１導電部１１１と第２導電部１１２との間に入り込んでいる。連続部１１３によってタブ群１０１の先端がケース１１に接触することが抑制されている。 The conductive member 110 is continuous with the first conductive portion 111 and the second conductive portion 112, and the first conductive portion 111 and the second conductive portion 112, which face each other in the plate thickness direction by folding back the plate-shaped metal plate. A continuous portion 113 is provided. The tip of the tab group 101 is inserted between the first conductive portion 111 and the second conductive portion 112. The continuous portion 113 prevents the tip of the tab group 101 from coming into contact with the case 11.

（１）上記したように、導電部材１１０を折り返し形状とすることで、タブ群１０１の先端がケース１１に接触することを抑制できる。しかしながら、導電部材１１０を折り返し形状とする場合、平板状の導電部材１６に比べて歩留まりが悪くなる。導電部材１６を平板状とすると、タブ群１０１の先端がケース１１に接触することを導電部材１６によって抑制することができない。 (1) As described above, by forming the conductive member 110 into a folded shape, it is possible to prevent the tip of the tab group 101 from coming into contact with the case 11. However, when the conductive member 110 has a folded shape, the yield is lower than that of the flat conductive member 16. If the conductive member 16 has a flat plate shape, the conductive member 16 cannot prevent the tip of the tab group 101 from coming into contact with the case 11.

これに対して、実施形態のタブ群３１は、一辺２５ａの延びる方向から見て第１溶接部３３の一部が電極組立体２０における積層方向の中心線Ｌ１に重なる。結果として、複数のタブ３０は、電極組立体２０における積層方向の中心寄りに寄せ集められることになる。 On the other hand, in the tab group 31 of the embodiment, a part of the first welded portion 33 overlaps with the center line L1 in the stacking direction in the electrode assembly 20 when viewed from the extending direction of the side 25a. As a result, the plurality of tabs 30 are gathered toward the center of the electrode assembly 20 in the stacking direction.

タブ３０を電極組立体２０における積層方向一端に寄せ集めた場合、タブ３０を積層方他端に向けて延ばすために、積層方向一端でタブ３０を曲げる必要がある。結果として、曲げ部１０２は電極組立体２０における積層方向一端に寄る。これに対して、タブ３０を電極組立体２０における積層方向の中心寄りに寄せ集めた場合、第１溶接部３３と、積層方向に位置するケース本体１２の側壁との間の領域を利用して第１延設部３４を設けることができる。第１延設部３４と第２延設部３６で、タブ群３１のうち第１溶接部３３と第２溶接部３７との間の部分を二分することができるため、タブ群３１が導電部材１６の幅内に収まりやすい。タブ３０を電極組立体２０の積層方向一端に寄せ集める場合と比較して、タブ群３１の先端と、曲げ部３５とをケース１１から離すことができ、タブ群３１が導電部材１６の幅内に収まりやすく、タブ群３１がケース１１と接触することを抑制することができる。 When the tabs 30 are gathered together at one end in the stacking direction in the electrode assembly 20, it is necessary to bend the tab 30 at one end in the stacking direction in order to extend the tab 30 toward the other end in the stacking direction. As a result, the bent portion 102 is closer to one end in the stacking direction in the electrode assembly 20. On the other hand, when the tabs 30 are gathered closer to the center of the electrode assembly 20 in the stacking direction, the area between the first welded portion 33 and the side wall of the case body 12 located in the stacking direction is used. The first extension portion 34 can be provided. Since the first extension portion 34 and the second extension portion 36 can divide the portion of the tab group 31 between the first welded portion 33 and the second welded portion 37 into two, the tab group 31 is a conductive member. It is easy to fit within the width of 16. Compared with the case where the tabs 30 are gathered at one end in the stacking direction of the electrode assembly 20, the tip of the tab group 31 and the bent portion 35 can be separated from the case 11, and the tab group 31 is within the width of the conductive member 16. It is easy to fit in the case, and it is possible to prevent the tab group 31 from coming into contact with the case 11.

（２）中心線Ｌ１と中心線Ｌ２とは重なり合う。よって、複数のタブ３０を電極組立体２０の中心に寄せ集めることができるため、タブ群３１の先端と、曲げ部３５とをケース１１から離しやすい。 (2) The center line L1 and the center line L2 overlap each other. Therefore, since the plurality of tabs 30 can be gathered at the center of the electrode assembly 20, the tip of the tab group 31 and the bent portion 35 can be easily separated from the case 11.

（３）導電部材１６の縁１６ａから第２溶接部３７までの寸法を２倍した値よりも、タブ３０の突出方向における第１溶接部３３と第２溶接部３７との間の寸法の値は小さい。このため、タブ群３１が導電部材１６の幅内に収まりやすい。 (3) The value of the dimension between the first welded portion 33 and the second welded portion 37 in the protruding direction of the tab 30 rather than the value obtained by doubling the dimension from the edge 16a of the conductive member 16 to the second welded portion 37. Is small. Therefore, the tab group 31 is likely to fit within the width of the conductive member 16.

なお、実施形態は、以下のように変更してもよい。
○一辺２５ａの延びる方向から見て、第１溶接部３３の一部が電極組立体２０における積層方向の中心線Ｌ１と重なっていれば、中心線Ｌ１と中心線Ｌ２とは重なっていなくてもよい。 The embodiment may be changed as follows.
○ If a part of the first welded portion 33 overlaps with the center line L1 in the stacking direction in the electrode assembly 20 when viewed from the extending direction of the side 25a, the center line L1 and the center line L2 do not overlap. Good.

○２Ａ＞Ｂは満たされなくてもよい。この場合であっても、タブ３０を寄せ集める位置を調整することで、タブ群３１を導電部材１６の幅内に収めることができる。
○一辺２５ａからのタブ３０の突出長は異なっていてもよい。例えば、積層方向の中心に近い電極２１程、タブ３０の突出長を短くすることで、第２延設部３６において、各タブ３０の積層方向の端面を揃えてもよい。 ○ 2A> B may not be satisfied. Even in this case, the tab group 31 can be accommodated within the width of the conductive member 16 by adjusting the position where the tabs 30 are gathered together.
○ The protruding length of the tab 30 from one side 25a may be different. For example, the end faces of the tabs 30 in the stacking direction may be aligned in the second extending portion 36 by shortening the protruding length of the tabs 30 closer to the center of the stacking direction.

○絶縁カバー４０は、第２絶縁部４２を備えていなくてもよい。この場合であっても、タブ群３１の先端と曲げ部３５とを、ケース１１から離すことができるため、タブ群３１がケース１１に接触することを抑制できる。 ○ The insulating cover 40 does not have to include the second insulating portion 42. Even in this case, since the tip of the tab group 31 and the bent portion 35 can be separated from the case 11, it is possible to prevent the tab group 31 from coming into contact with the case 11.

○第２溶接部３７は、導電部材１６における積層方向の中心からずれた位置にタブ群３１を溶接してもよい。
○第２溶接部３７は、第１溶接部３３よりもタブ群３１の先端側に位置していればよく、タブ群３１の先端とは異なる位置に設けられていてもよい。 ○ The second welded portion 37 may weld the tab group 31 at a position deviated from the center of the conductive member 16 in the stacking direction.
○ The second welded portion 37 may be located closer to the tip end side of the tab group 31 than the first welded portion 33, and may be provided at a position different from the tip end of the tab group 31.

１０…二次電池（蓄電装置）、１１…ケース、１４…電極端子、１６…導電部材、２０…電極組立体、２１…電極、２５ａ…一辺、３０…タブ、３１，３２…タブ群、３３…第１溶接部、３４…第１延設部、３５…曲げ部、３６…第２延設部、３７…第２溶接部。 10 ... Secondary battery (power storage device), 11 ... Case, 14 ... Electrode terminal, 16 ... Conductive member, 20 ... Electrode assembly, 21 ... Electrode, 25a ... One side, 30 ... Tab, 31, 32 ... Tab group, 33 ... 1st welded portion, 34 ... 1st extended portion, 35 ... bent portion, 36 ... 2nd extended portion, 37 ... 2nd welded portion.

Claims (2)

一辺から突出した形状のタブを有する電極が、異なる極性の電極同士を互いに絶縁した状態で積層され、同じ極性同士の前記タブを寄せ集めて積層したタブ群を含む電極組立体と、
前記電極組立体が収容されたケースと、
前記ケースに固定され、前記電極組立体と電気を授受する電極端子と、
前記タブ群と前記電極端子とを電気的に接続する平板状の導電部材と、を備え、
前記タブ群は、
同じ極性同士で寄せ集めて積層された前記タブ同士を溶接した第１溶接部と、
前記第１溶接部よりも先端側に位置し、少なくとも１つのタブと前記導電部材とを溶接した第２溶接部と、
前記電極組立体における前記電極の積層方向の一端に向けて前記第１溶接部から延びる第１延設部と、
前記第１延設部に連続し、前記電極組立体における前記電極の積層方向の他端に向けて前記タブ群を折り返す曲げ部と、
前記曲げ部から前記第２溶接部に向けて延びる第２延設部と、を備え、
前記一辺の延びる方向に見て、前記第１溶接部の一部は、前記電極組立体における前記電極の積層方向の中心線に重なり、
前記導電部材の縁のうち、前記電極の積層方向の一端側の縁から前記第２溶接部までの寸法を２倍した値よりも、前記タブの突出方向における前記第１溶接部と前記第２溶接部との間の寸法の値は小さい蓄電装置。 An electrode assembly including a group of tabs in which electrodes having tabs having a shape protruding from one side are laminated in a state where electrodes having different polarities are insulated from each other and the tabs having the same polarity are gathered and laminated.
The case in which the electrode assembly is housed and
An electrode terminal fixed to the case and transmitting electricity to and from the electrode assembly,
A flat conductive member for electrically connecting the tab group and the electrode terminal is provided.
The tab group is
A first welded portion in which the tabs that are laminated together with the same polarity are welded together,
A second welded portion located on the tip side of the first welded portion and in which at least one tab and the conductive member are welded together.
A first extending portion extending from the first welded portion toward one end in the stacking direction of the electrodes in the electrode assembly,
A bending portion continuous with the first extending portion and folding back the tab group toward the other end in the stacking direction of the electrodes in the electrode assembly.
A second extending portion extending from the bent portion toward the second welded portion is provided.
As seen in the direction of extension of the side, the portion of the first weld, heavy Do Ri to the center line in the stacking direction of the electrode in the electrode assembly,
Of the edges of the conductive member, the first welded portion and the second welded portion in the protruding direction of the tab are more than the value obtained by doubling the dimension from the edge on one end side in the stacking direction of the electrodes to the second welded portion. A power storage device with a small dimensional value between the welded part . 前記第１溶接部における前記タブの積層方向の中心線は、前記電極組立体における前記電極の積層方向の中心線と重なる請求項１に記載の蓄電装置。 The power storage device according to claim 1, wherein the center line in the stacking direction of the tabs in the first welded portion overlaps with the center line in the stacking direction of the electrodes in the electrode assembly.
JP2016130161A 2016-06-30 2016-06-30 Power storage device Active JP6769137B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2016130161A JP6769137B2 (en) 2016-06-30 2016-06-30 Power storage device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2016130161A JP6769137B2 (en) 2016-06-30 2016-06-30 Power storage device

Publications (2)

Publication Number Publication Date
JP2018006114A JP2018006114A (en) 2018-01-11
JP6769137B2 true JP6769137B2 (en) 2020-10-14

Family

ID=60946400

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2016130161A Active JP6769137B2 (en) 2016-06-30 2016-06-30 Power storage device

Country Status (1)

Country Link
JP (1) JP6769137B2 (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7055983B2 (en) * 2018-09-28 2022-04-19 太陽誘電株式会社 Electrochemical devices and methods for manufacturing electrochemical devices
JP7300266B2 (en) * 2018-12-27 2023-06-29 三洋電機株式会社 secondary battery
CN111384353A (en) * 2018-12-29 2020-07-07 宁德时代新能源科技股份有限公司 Secondary battery and battery module
JP2020145118A (en) * 2019-03-07 2020-09-10 株式会社Ｇｓユアサ Power storage element
CN111106301B (en) * 2019-04-02 2021-02-26 宁德时代新能源科技股份有限公司 Secondary battery and battery module
JP7469093B2 (en) * 2020-03-25 2024-04-16 本田技研工業株式会社 Lithium-ion secondary battery
CN113871807A (en) * 2020-06-30 2021-12-31 比亚迪股份有限公司 Battery and battery pack
CN217641684U (en) * 2022-03-24 2022-10-21 宁德时代新能源科技股份有限公司 Electrode assembly, battery cell, battery and electric device
WO2024020766A1 (en) * 2022-07-26 2024-02-01 宁德时代新能源科技股份有限公司 Battery cell, battery, electric apparatus, and manufacturing method for battery cell
CN116722321A (en) * 2023-08-10 2023-09-08 宁德时代新能源科技股份有限公司 Electrode assembly, battery cell, assembly method of battery cell, battery pack and power utilization device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111430654A (en) * 2014-12-11 2020-07-17 株式会社杰士汤浅国际 Electric storage element

Also Published As

Publication number Publication date
JP2018006114A (en) 2018-01-11

Similar Documents

Publication Publication Date Title
JP6769137B2 (en) Power storage device
JP6675971B2 (en) Power storage device
JP6064879B2 (en) Power storage device
JP6967413B2 (en) Power storage device and manufacturing method of power storage device
JP6035922B2 (en) Power storage device
WO2015098955A1 (en) Electricity storage device
JP6922980B2 (en) Power storage device
JP6160350B2 (en) Power storage device
WO2014027606A1 (en) Electrical storage device
JP6079592B2 (en) Power storage device
JP2016012542A (en) Power storage device
JP2014035998A (en) Power storage device
JP6287563B2 (en) Power storage device
JP5796544B2 (en) Power storage device
JP6274011B2 (en) Power storage device
JP5621750B2 (en) Secondary battery and vehicle equipped with secondary battery
JP2018200840A (en) Power storage device
JP2020098688A (en) Power storage device
JP7008461B2 (en) Power storage element and manufacturing method of power storage element
JP2017079139A (en) Sealed battery
JP6772830B2 (en) Power storage device
JP2021026897A (en) Electrode assembly
JP6597813B2 (en) Power storage device
JP5724956B2 (en) Power storage device
JP6951682B2 (en) Power storage element

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20190304

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20200109

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20200212

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20200410

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20200825

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20200907

R151 Written notification of patent or utility model registration

Ref document number: 6769137

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R151