JP5733252B2 - Connection method - Google Patents
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- JP5733252B2 JP5733252B2 JP2012072108A JP2012072108A JP5733252B2 JP 5733252 B2 JP5733252 B2 JP 5733252B2 JP 2012072108 A JP2012072108 A JP 2012072108A JP 2012072108 A JP2012072108 A JP 2012072108A JP 5733252 B2 JP5733252 B2 JP 5733252B2
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- electrode tab
- positive electrode
- tab group
- negative electrode
- current collecting
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- 238000000034 method Methods 0.000 title claims description 29
- 238000005452 bending Methods 0.000 claims description 38
- 238000010030 laminating Methods 0.000 claims description 21
- 238000005219 brazing Methods 0.000 claims description 16
- 238000004804 winding Methods 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 description 21
- 239000002184 metal Substances 0.000 description 21
- 239000011149 active material Substances 0.000 description 19
- 239000011888 foil Substances 0.000 description 16
- 238000005304 joining Methods 0.000 description 9
- 238000004080 punching Methods 0.000 description 9
- 238000007790 scraping Methods 0.000 description 7
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 6
- 229910001416 lithium ion Inorganic materials 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000003860 storage Methods 0.000 description 5
- 230000037303 wrinkles Effects 0.000 description 5
- 239000003792 electrolyte Substances 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 238000003475 lamination Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910000652 nickel hydride Inorganic materials 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910003002 lithium salt Inorganic materials 0.000 description 1
- 159000000002 lithium salts Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052987 metal hydride Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- -1 nickel metal hydride Chemical class 0.000 description 1
- 239000011255 nonaqueous electrolyte Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
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
- Secondary Cells (AREA)
- Connection Of Batteries Or Terminals (AREA)
Description
本発明は、シート状の電極が積層された積層型の電極体を備えた蓄電装置における電極タブ群と集電部材との接続方法に関する。 The present invention relates to a method for connecting an electrode tab group and a current collecting member in a power storage device including a stacked electrode body in which sheet-like electrodes are stacked.
従来から、蓄電装置の一種である二次電池としては、リチウムイオン二次電池やニッケル水素二次電池などがよく知られている。例えばリチウムイオン二次電池は、金属箔に活物質を含む活物質合剤を塗布して活物質層を形成した電極が層状（積層構造）をなす電極体と、電解質塩（リチウム塩）を溶解させた非水電解質と、をケースに収容した構成とされている。 Conventionally, lithium ion secondary batteries, nickel metal hydride secondary batteries, and the like are well known as secondary batteries that are a type of power storage device. For example, in a lithium ion secondary battery, an electrode body in which an active material layer containing an active material is applied to a metal foil to form an active material layer has a layered structure (laminated structure) and an electrolyte salt (lithium salt) is dissolved. It is set as the structure which accommodated the made nonaqueous electrolyte in the case.
このような二次電池において、電極体の端部から延出形成された電極タブ群（電極タブ）には、当該電極タブ群と、ケースの外部に配置される電極端子とを電気的に接続するための集電端子が接続されている（例えば特許文献１）。特許文献１の二次電池は、複数の電極を積層することにより、複数の電極タブが延出形成された電極体を形成するとともに、集電端子の上面及び下面にそれぞれ複数（例えば３つ）の電極タブを接続した構成とされている。 In such a secondary battery, the electrode tab group (electrode tab) formed to extend from the end of the electrode body is electrically connected to the electrode tab group and an electrode terminal disposed outside the case. A current collecting terminal is connected (for example, Patent Document 1). The secondary battery of Patent Document 1 forms an electrode body in which a plurality of electrode tabs are extended by laminating a plurality of electrodes, and a plurality (for example, three) each on the upper surface and the lower surface of the current collecting terminal. The electrode tabs are connected.
しかしながら、特許文献１の二次電池では、電極を積層して電極体を形成した際に、各電極タブが電極の積層方向に対して略一定間隔となるように配置されることから、電極タブの間に集電部材や、集電部材を接続するための冶具を挿入し難い。このため、特許文献１では、電極タブ群と集電部材とを接続し難いという問題があった。 However, in the secondary battery disclosed in Patent Document 1, when the electrode body is formed by stacking the electrodes, the electrode tabs are arranged so as to have a substantially constant interval in the electrode stacking direction. It is difficult to insert a current collecting member or a jig for connecting the current collecting member between them. For this reason, in patent document 1, there existed a problem that it was difficult to connect an electrode tab group and a current collection member.
この発明は、上記従来技術に存在する問題点に着目してなされたものであり、その目的は、電極タブ群と集電部材とを容易に接続できる接続方法を提供することにある。 The present invention has been made in view of the problems existing in the prior art, and an object thereof is to provide a connecting method in which the electrode tab group and the current collector member Ru can be easily connected.
上記課題を解決するために、請求項１に記載の発明は、シート状の電極が積層された積層型の電極体を備え、各前記電極の端部からそれぞれ延出形成された電極タブが積層されて構成される電極タブ群と、集電部材とを電気的に接続する接続方法であって、前記電極の端部から延出形成される電極タブの少なくとも基端部が前記電極の面に垂直な方向に湾曲するように癖付けする癖付け工程と、前記電極を積層する積層工程と、を含み、前記積層工程では、複数の前記電極タブ群を前記電極の積層方向に隣り合うように配置し、各前記電極タブ群を構成する全ての電極タブの基端部の湾曲方向を各前記電極タブ群毎に同一方向に揃えるとともに隣り合わせる前記電極タブ群同士で湾曲方向が反対方向となるように前記癖付けした電極を積層することを要旨とする。 In order to solve the above-mentioned problems, the invention according to claim 1 is provided with a laminated electrode body in which sheet-like electrodes are laminated, and electrode tabs extending from the end portions of the respective electrodes are laminated. An electrode tab group configured to be electrically connected to a current collecting member, wherein at least a base end portion of the electrode tab formed to extend from an end portion of the electrode is on the surface of the electrode. A brazing step of brazing so as to curve in a vertical direction, and a laminating step of laminating the electrodes, and in the laminating step, the plurality of electrode tab groups are adjacent to each other in the laminating direction of the electrodes. Arrange the bending direction of the base end portion of all electrode tabs constituting each electrode tab group in the same direction for each electrode tab group, and the bending direction is opposite between adjacent electrode tab groups Laminate the brazed electrodes so that It is the gist of.
これによれば、予め、電極の端部から延出形成される電極タブの少なくとも基端部が前記電極の面に垂直な方向に湾曲するように癖付けする。そして、積層工程では、複数の電極タブ群を電極の積層方向に隣り合うように配置し、各電極タブ群を構成する全ての電極タブの基端部の湾曲方向を各電極タブ群毎に同一方向に揃えるとともに隣り合わせる電極タブ群同士で湾曲方向が反対方向となるように癖付けした電極を積層する。このため、隣り合わせる電極タブ群同士で湾曲方向が反対方向となることから、隣り合う電極タブ群において、電極タブ群と電極タブ群との間に隙間を生じさせ、電極タブ群（電極タブ）の間に集電部材や、集電部材を接続するための冶具を挿入し易くすることができる。したがって、電極タブ群と集電部材とを容易に接続できる。 According to this, it brazes beforehand so that the at least base end part of the electrode tab extended and formed from the edge part of an electrode may curve in the direction perpendicular | vertical to the surface of the said electrode. In the stacking step, a plurality of electrode tab groups are arranged adjacent to each other in the electrode stacking direction, and the bending direction of the base end portion of all the electrode tabs constituting each electrode tab group is the same for each electrode tab group. The electrode tab groups that are aligned in the direction and that are adjacent to each other are laminated such that the bending directions are opposite to each other. For this reason, since the adjacent electrode tab groups have opposite bending directions, a gap is created between the electrode tab group and the electrode tab group in the adjacent electrode tab group, and the electrode tab group (electrode tab) It is possible to easily insert a current collecting member or a jig for connecting the current collecting member between the two. Therefore, the electrode tab group and the current collecting member can be easily connected.
請求項２に記載の発明は、請求項１に記載の接続方法において、前記癖付け工程は、前記電極をロール状に捲回して行うことを要旨とする。
これによれば、例えば電極を保管するためにロール状に捲回した際に付けられた癖を利用することができる。したがって、特別な工程を設けることなく、電極タブの基端部側が湾曲するように癖付けできる。
The gist of the invention according to claim 2 is that, in the connection method according to claim 1 , the brazing step is performed by winding the electrode in a roll shape.
According to this, it is possible to use, for example, a bag attached when the electrode is wound into a roll to store it. Therefore, it can be brazed so that the base end part side of an electrode tab may curve, without providing a special process.
本発明によれば、電極タブ群と集電部材とを容易に接続できる。 According to the present invention, the electrode tab group and the current collecting member can be easily connected.
以下、本発明を具体化した一実施形態を図１〜図７にしたがって説明する。
図１に示すように、車両（例えば産業車両や乗用車両）に搭載される二次電池１０は、全体として扁平な略直方体状をなすケース１１を備えている。ケース１１は、有底筒状（本実施形態では四角筒状）に形成された本体部材１２、及び本体部材１２の開口部１２ａを密閉するように、本体部材１２に組み付けられる平板状（本実施形態では矩形平板状）をなす蓋部材１３から形成されている。本体部材１２、及び蓋部材１３は、何れも金属（例えばステンレスやアルミニウムなど）から形成されている。以下の説明では、矢印Ｙ１に示すケース１１の長手方向を左右方向と示し、矢印Ｙ２に示すケース１１の高さ方向を上下方向と示し、矢印Ｙ３に示すケース１１の短手方向を前後方向と示す。
Hereinafter, an embodiment embodying the present invention will be described with reference to FIGS.
As shown in FIG. 1, a secondary battery 10 mounted on a vehicle (for example, an industrial vehicle or a passenger vehicle) includes a case 11 having a flat and substantially rectangular parallelepiped shape as a whole. The case 11 has a flat plate shape (this embodiment) assembled to the main body member 12 so as to seal the main body member 12 formed in a bottomed cylindrical shape (square tube shape in the present embodiment) and the opening 12a of the main body member 12. It is formed from a lid member 13 having a rectangular flat plate shape. The main body member 12 and the lid member 13 are both made of metal (for example, stainless steel or aluminum). In the following description, the longitudinal direction of the case 11 indicated by the arrow Y1 is indicated as the left-right direction, the height direction of the case 11 indicated by the arrow Y2 is indicated as the vertical direction, and the short direction of the case 11 indicated by the arrow Y3 is indicated as the front-back direction. Show.
蓋部材１３の外面（上面）には、円柱状（略円柱状）をなす正極端子１５、及び負極端子１６が突出するように設けられている。正極端子１５及び負極端子１６は、ケース１１（本体部材１２及び蓋部材１３）と絶縁されている。 On the outer surface (upper surface) of the lid member 13, a positive electrode terminal 15 and a negative electrode terminal 16 having a cylindrical shape (substantially cylindrical shape) are provided so as to protrude. The positive electrode terminal 15 and the negative electrode terminal 16 are insulated from the case 11 (the main body member 12 and the lid member 13).
また、ケース１１には、左右方向に扁平な直方体状（略直方体状）をなす電極体２１が収容（収納）されている。この電極体２１は、シート状の電極としての正電極シート２３及び負電極シート２４が間にセパレータ２２を挟んだ状態で積層された積層型の電極体である。より詳しく言えば、電極体２１は、正電極シート２３及び負電極シート２４を間にセパレータ２２を挟んだ状態で積層した第１積層体２５ａ及び第２積層体２５ｂをさらに積層して形成されている。なお、電極体２１は、絶縁材料からなる図示しない絶縁袋に覆われた状態でケース１１に収容されている。また、ケース１１内には、例えばリチウムイオン二次電池や、ニッケル水素二次電池というように、二次電池１０の種類に応じた電解質が充填されている。 Further, the case 11 accommodates (accommodates) an electrode body 21 having a rectangular parallelepiped shape (substantially rectangular parallelepiped shape) flat in the left-right direction. The electrode body 21 is a stacked electrode body in which a positive electrode sheet 23 and a negative electrode sheet 24 as sheet-like electrodes are stacked with a separator 22 interposed therebetween. More specifically, the electrode body 21 is formed by further laminating a first laminated body 25a and a second laminated body 25b in which the positive electrode sheet 23 and the negative electrode sheet 24 are laminated with the separator 22 interposed therebetween. Yes. The electrode body 21 is accommodated in the case 11 while being covered with an insulating bag (not shown) made of an insulating material. The case 11 is filled with an electrolyte corresponding to the type of the secondary battery 10 such as a lithium ion secondary battery or a nickel hydride secondary battery.
図２に示すように、正電極シート２３及び負電極シート２４は、矩形のシート状をなす金属箔（金属シート）２６ａを備えている。金属箔２６ａは、例えばリチウムイオン二次電池や、ニッケル水素二次電池というように、二次電池１０の種類に応じた金属により形成される。また、金属箔２６ａに用いられる金属は、正電極シート２３と、負電極シート２４とでも異なる。 As shown in FIG. 2, the positive electrode sheet 23 and the negative electrode sheet 24 include a metal foil (metal sheet) 26 a having a rectangular sheet shape. The metal foil 26a is formed of a metal corresponding to the type of the secondary battery 10, such as a lithium ion secondary battery or a nickel hydride secondary battery. Further, the metal used for the metal foil 26 a is different between the positive electrode sheet 23 and the negative electrode sheet 24.
また、各金属箔２６ａの両表面（前面及び後面）には、各金属箔２６ａの上端部Ｅから左右方向の全幅にわたって一定幅で設定された非塗布領域２６ｂを除き、その全面に活物質（活物質合剤）が塗布され、活物質層２７が形成されている。なお、金属箔２６ａには、二次電池１０の種類に応じた活物質が塗布される。また、金属箔２６ａに塗布される活物質は、正電極シート２３と、負電極シート２４とでも異なる。 In addition, on both surfaces (front surface and rear surface) of each metal foil 26a, an active material (on the entire surface of the metal foil 26a except for the non-application region 26b set with a constant width from the upper end E to the entire width in the left-right direction) An active material mixture) is applied to form an active material layer 27. In addition, the active material according to the kind of secondary battery 10 is apply | coated to the metal foil 26a. Further, the active material applied to the metal foil 26 a is different between the positive electrode sheet 23 and the negative electrode sheet 24.
また、正電極シート２３の上端部Ｅのうち左側には、矩形（略矩形）をなす電極タブとしての正電極タブ２３ａが上方（蓋部材１３側）に向かって延出形成されている。一方、負電極シート２４の上端部Ｅのうち右側には、矩形（略矩形）をなす電極タブとしての負電極タブ２４ａが上方に向かって延出形成されている。正電極タブ２３ａ及び負電極タブ２４ａの表面には、活物質層２７が形成されていない。したがって、正電極タブ２３ａ及び負電極タブ２４ａは、非塗布領域２６ｂの一部をなしているともいえる。 Further, a positive electrode tab 23a as a rectangular (substantially rectangular) electrode tab is formed on the left side of the upper end E of the positive electrode sheet 23 so as to extend upward (on the lid member 13 side). On the other hand, on the right side of the upper end E of the negative electrode sheet 24, a negative electrode tab 24a serving as a rectangular (substantially rectangular) electrode tab is formed to extend upward. The active material layer 27 is not formed on the surfaces of the positive electrode tab 23a and the negative electrode tab 24a. Therefore, it can be said that the positive electrode tab 23a and the negative electrode tab 24a form part of the non-application area 26b.
なお、図２では、正電極タブ２３ａ及び負電極タブ２４ａを平面状に記載しているが、後述するように実際には湾曲した形状をなしている。また、セパレータ２２は、絶縁性を有する樹脂材料からなり、極めて微細な空孔構造をなす矩形の多孔性シートとされている。 In FIG. 2, the positive electrode tab 23a and the negative electrode tab 24a are shown in a planar shape, but actually have a curved shape as will be described later. The separator 22 is made of an insulating resin material and is a rectangular porous sheet having an extremely fine pore structure.
また、各積層体２５ａ，２５ｂは、それぞれセパレータ２２を介在させた状態で正電極シート２３及び負電極シート２４を前後方向（厚さ方向）に積層して形成されている。より詳しく言えば、各積層体２５ａ，２５ｂにおいて、正電極シート２３及び負電極シート２４は、…→正電極シート２３→負電極シート２４→正電極シート２３…のように、交互に配置されている。 Each laminate 25a, 25b is formed by laminating a positive electrode sheet 23 and a negative electrode sheet 24 in the front-rear direction (thickness direction) with a separator 22 interposed therebetween. More specifically, in each of the laminates 25a and 25b, the positive electrode sheet 23 and the negative electrode sheet 24 are alternately arranged as follows: → positive electrode sheet 23 → negative electrode sheet 24 → positive electrode sheet 23. Yes.
本実施形態の各積層体２５ａ，２５ｂを構成する電極シート２３，２４のうち、矢印Ｙ３に示す各積層体２５ａ，２５ｂ（電極シート２３，２４）の積層方向において最も外側に配置される電極シートは、一方が正電極シート２３とされている一方で、他方が負電極シート２４とされている。以下の説明では、各積層体２５ａ，２５ｂにおいて、各積層体２５ａ，２５ｂを構成する電極シート２３，２４のうち、積層方向の最も外側に負電極シート２４が配置された側の面を負極面Ｍ１と示し、正電極シート２３が配置された側の面を正極面Ｍ２と示す。なお各積層体２５ａ，２５ｂでは、積層方向の最も外側（最前面及び最後面）にもセパレータ２２が配置されている。 Of the electrode sheets 23 and 24 constituting the respective laminates 25a and 25b of the present embodiment, the electrode sheet disposed on the outermost side in the stacking direction of the respective laminates 25a and 25b (electrode sheets 23 and 24) indicated by the arrow Y3. One is a positive electrode sheet 23 while the other is a negative electrode sheet 24. In the following description, in each of the stacked bodies 25a and 25b, the surface on the side where the negative electrode sheet 24 is disposed on the outermost side in the stacking direction among the electrode sheets 23 and 24 constituting the stacked bodies 25a and 25b is the negative electrode surface. The surface on which the positive electrode sheet 23 is disposed is denoted as M1 and is referred to as a positive electrode surface M2. In each of the stacked bodies 25a and 25b, the separator 22 is also disposed on the outermost side (frontmost surface and rearmost surface) in the stacking direction.
また、図１に示すように、各積層体２５ａ，２５ｂでは、電極シート２３，２４を積層することにより、各積層体２５ａ，２５ｂにおける上端部Ｅのうち左側から上方に向かって、複数の正電極タブ２３ａが積層されて構成される電極タブ群としての正電極タブ群２８がそれぞれ延出形成されている。同様にして、各積層体２５ａ，２５ｂでは、電極シート２３，２４を積層することにより、各積層体２５ａ，２５ｂにおける上端部Ｅの右側から上方に向かって、複数の負電極タブ２４ａが積層されて構成される電極タブ群としての負電極タブ群２９がそれぞれ延出形成されている。 In addition, as shown in FIG. 1, in each of the stacked bodies 25a and 25b, by stacking the electrode sheets 23 and 24, a plurality of positive electrodes are formed from the left side to the upper side of the upper end E of each stacked body 25a and 25b. A positive electrode tab group 28 as an electrode tab group configured by laminating the electrode tabs 23a is extended and formed. Similarly, in each laminated body 25a, 25b, by laminating the electrode sheets 23, 24, a plurality of negative electrode tabs 24a are laminated from the right side of the upper end E in each laminated body 25a, 25b upward. A negative electrode tab group 29 as an electrode tab group configured as described above is extended and formed.
また、図３に示すように、各積層体２５ａ，２５ｂは、負極面Ｍ１が相互に対向して隣り合うように積層されて電極体２１を形成している。換言すれば、電極体２１において隣り合う積層体２５ａ，２５ｂのうち最も対向面側には、負電極シート２４が対向するように配置されている。本実施形態では、前後方向が各積層体２５ａ，２５ｂの対向方向となる。 Moreover, as shown in FIG. 3, each laminated body 25a, 25b is laminated | stacked so that the negative electrode surface M1 may mutually oppose and adjoin, and the electrode body 21 is formed. In other words, in the electrode body 21, the negative electrode sheet 24 is disposed so as to face the most facing surface side among the stacked bodies 25 a and 25 b adjacent to each other. In the present embodiment, the front-rear direction is the facing direction of the stacked bodies 25a and 25b.
このように、本実施形態の電極体２１は、電極体２１における積層方向（正電極タブ２３ａ及び負電極タブ２４ａの積層方向）に隣り合う複数の正電極タブ群２８、及び複数の負電極タブ群２９（各積層体２５ａ，２５ｂ）を含んで構成される。そして、電極体２１では、隣り合う各電極タブ群２８，２９（各積層体２５ａ，２５ｂ）のうち最も正電極タブ群２８（負電極タブ群２９）から見て隣り合う正電極タブ群２８（負電極タブ群２９）に近い側に配置される電極タブが突出形成された電極シートは、負電極シート２４である。 Thus, the electrode body 21 of the present embodiment includes a plurality of positive electrode tab groups 28 adjacent to each other in the stacking direction of the electrode body 21 (the stacking direction of the positive electrode tab 23a and the negative electrode tab 24a), and a plurality of negative electrode tabs. The group 29 (each laminated body 25a, 25b) is comprised. And in the electrode body 21, the positive electrode tab group 28 (adjacent to the positive electrode tab group 28 (negative electrode tab group 29) as viewed from the most positive electrode tab group 28 (negative electrode tab group 29) among the adjacent electrode tab groups 28 and 29 (respective stacked bodies 25a and 25b). The electrode sheet on which the electrode tab arranged on the side close to the negative electrode tab group 29) is formed is the negative electrode sheet 24.
また、図１に示すように、本実施形態の二次電池１０において、正電極タブ群２８（正電極タブ２３ａ）と、正極端子１５とは、集電部材としての集電端子３０によって電気的に接続されている。また、正電極タブ群２８（負電極タブ２４ａ）と、負極端子１６とは、集電部材としての集電端子３１によって電気的に接続されている。 Further, as shown in FIG. 1, in the secondary battery 10 of the present embodiment, the positive electrode tab group 28 (positive electrode tab 23a) and the positive electrode terminal 15 are electrically connected by a current collecting terminal 30 as a current collecting member. It is connected to the. Further, the positive electrode tab group 28 (negative electrode tab 24a) and the negative electrode terminal 16 are electrically connected by a current collecting terminal 31 as a current collecting member.
本実施形態の集電端子３１は、集電端子３０と同一構成（形状）であるとともに、集電端子３１と負電極タブ群２９（負電極タブ２４ａ）との接続構造は、集電端子３０と正電極タブ群２８（正電極タブ２３ａ）との接続構造と左右対称である。したがって、以下の説明では、主に集電端子３０の構成、及び集電端子３０と正電極タブ群２８（正電極タブ２３ａ）との接続構造について詳しく説明し、集電端子３１の構成、及び集電端子３１と負電極タブ群２９（負電極タブ２４ａ）との接続構造についてはその説明を省略又は簡略する。 The current collecting terminal 31 of this embodiment has the same configuration (shape) as the current collecting terminal 30, and the connection structure between the current collecting terminal 31 and the negative electrode tab group 29 (negative electrode tab 24 a) is the current collecting terminal 30. And the positive electrode tab group 28 (positive electrode tab 23a) are symmetrical to the connection structure. Therefore, in the following description, the structure of the current collecting terminal 30 and the connection structure between the current collecting terminal 30 and the positive electrode tab group 28 (positive electrode tab 23a) will be described in detail, and the structure of the current collecting terminal 31 and The description of the connection structure between the current collecting terminal 31 and the negative electrode tab group 29 (negative electrode tab 24a) is omitted or simplified.
図３に示すように、本実施形態の集電端子３０は、金属（例えばアルミニウムや銅）からなり、正電極タブ群２８（正電極タブ２３ａ）の延出方向に沿って、且つ各正電極タブ群２８（正電極タブ２３ａ）の面方向に沿って延びる平板状に形成されている。集電端子３０の基端部（上端部）は、正極端子１５のうちケース１１の外側に突出する上端部とは反対側の下端部に接合され、電気的に接続されている。なお、本実施形態において各集電端子３０，３１は、ケース１１（本体部材１２及び蓋部材１３）から絶縁された状態で蓋部材１３の下面（内面）に固定されている。 As shown in FIG. 3, the current collecting terminal 30 of the present embodiment is made of metal (for example, aluminum or copper), along the extending direction of the positive electrode tab group 28 (positive electrode tab 23 a), and each positive electrode. The tab group 28 (positive electrode tab 23a) is formed in a flat plate shape extending along the surface direction. The base end portion (upper end portion) of the current collecting terminal 30 is joined and electrically connected to the lower end portion of the positive electrode terminal 15 opposite to the upper end portion protruding to the outside of the case 11. In addition, in this embodiment, each current collection terminal 30 and 31 is being fixed to the lower surface (inner surface) of the cover member 13 in the state insulated from the case 11 (the main body member 12 and the cover member 13).
また、集電端子３０は、各積層体２５ａ，２５ｂにそれぞれ形成された正電極タブ群２８の間において、正電極タブ群２８を接続するための接続面３０ａが正電極タブ群２８の面方向に沿って配置されるように挿入されている。本実施形態では、集電端子３０の両面（前面及び後面）に接続面３０ａが設けられている。 In addition, the current collecting terminal 30 has a connecting surface 30a for connecting the positive electrode tab group 28 between the positive electrode tab groups 28 formed in the respective laminates 25a and 25b. It is inserted so that it may be arranged along. In the present embodiment, connection surfaces 30 a are provided on both surfaces (front surface and rear surface) of the current collecting terminal 30.
各正電極タブ群２８は、集電端子３０の接続面３０ａに対してそれぞれ接続（接合）されている。詳しく説明すると、各正電極タブ群２８は、集電端子３０（接続面３０ａ）側にそれぞれ寄せ集めた（寄り合わせた）状態で、例えば超音波溶接や、抵抗溶接（スポット溶接）によって接合されている。 Each positive electrode tab group 28 is connected (joined) to the connection surface 30 a of the current collecting terminal 30. More specifically, each positive electrode tab group 28 is joined by, for example, ultrasonic welding or resistance welding (spot welding) in a state where the positive electrode tab groups 28 are gathered together (closed to each other) on the current collecting terminal 30 (connection surface 30a) side. ing.
そして、各積層体２５ａ，２５ｂにそれぞれ形成された正電極タブ群２８は、各正電極タブ群２８を構成する全ての正電極タブ２３ａの基端部を各正電極タブ群２８毎に湾曲させた湾曲部２８ａを有する。 The positive electrode tab groups 28 respectively formed on the respective stacked bodies 25a and 25b are formed by bending the base ends of all the positive electrode tabs 23a constituting each positive electrode tab group 28 for each positive electrode tab group 28. A curved portion 28a.
詳しく説明すると、第１積層体２５ａの湾曲部２８ａは、第１積層体２５ａの正電極タブ群２８をなす全ての正電極タブ２３ａの基端部を、第２積層体２５ｂとは反対側に湾曲させて（撓ませて）形成されている。同様に、第２積層体２５ｂの湾曲部２８ａは、第２積層体２５ｂの正電極タブ群２８をなす全ての正電極タブ２３ａの基端部側を、第１積層体２５ａとは反対側に湾曲させて（撓ませて）形成されている。 More specifically, the curved portion 28a of the first stacked body 25a has the base end portions of all the positive electrode tabs 23a forming the positive electrode tab group 28 of the first stacked body 25a on the side opposite to the second stacked body 25b. It is formed by bending (bending). Similarly, the curved portion 28a of the second stacked body 25b has the base end side of all the positive electrode tabs 23a forming the positive electrode tab group 28 of the second stacked body 25b on the side opposite to the first stacked body 25a. It is formed by bending (bending).
したがって、各湾曲部２８ａの湾曲方向は、隣り合う正電極タブ群２８、換言すれば各積層体２５ａ，２５ｂ同士で反対方向である。そして、各湾曲部２８ａの湾曲方向は、各積層体２５ａ，２５ｂにおいて、一方の正電極タブ群２８から見て隣り合う正電極タブ群２８に向かう方向（近接する方向）に凸となる方向の湾曲である。 Therefore, the bending direction of each bending portion 28a is the opposite direction between the adjacent positive electrode tab groups 28, in other words, the stacked bodies 25a and 25b. The bending direction of each bending portion 28a is a direction that protrudes in the direction toward (adjacent to) the adjacent positive electrode tab group 28 when viewed from one positive electrode tab group 28 in each stacked body 25a, 25b. It is curved.
同様に、図１に示すように、各積層体２５ａ，２５ｂにそれぞれ形成された負電極タブ群２９は、各負電極タブ群２９を構成する負電極タブ２４ａの基端部側を湾曲させた湾曲部２９ａを有している。なお、本実施形態において、各負電極タブ群２９の湾曲部２９ａは、負電極タブ２４ａの基端部側を湾曲させて形成されている点を除いて正電極タブ群２８の湾曲部２８ａと同一構成とされている。したがって、本実施形態の各積層体２５ａ，２５ｂは、各積層体２５ａ，２５ｂの積層方向において対称に構成されている。 Similarly, as shown in FIG. 1, the negative electrode tab group 29 formed in each of the stacked bodies 25 a and 25 b has the base end side of the negative electrode tab 24 a constituting each negative electrode tab group 29 curved. It has a curved portion 29a. In the present embodiment, the curved portion 29a of each negative electrode tab group 29 is formed with the curved portion 28a of the positive electrode tab group 28, except that the proximal end side of the negative electrode tab 24a is curved. It is the same composition. Therefore, each laminated body 25a, 25b of this embodiment is comprised symmetrically in the lamination direction of each laminated body 25a, 25b.
次に、上記のように構成した二次電池１０（電極体２１）の製造方法について、その作用とともに説明する。
図４に示すように、最初に帯状（長尺のシート状）をなす金属箔２６ａの両表面に対して活物質（活物質合剤）を塗布する塗布工程を行う（ステップＳ１）。図５に示すように、塗布工程では、金属箔２６ａの長さ方向（矢印Ｙ４に示す）に非塗布領域２６ｂを挟んで活物質層２７を間欠的に形成する。なお、活物質層２７（非塗布領域２６ｂ）は、帯状をなす金属箔２６ａにおける幅方向（矢印Ｙ５に示す）の全幅にわたって形成するとともに、金属箔２６ａの長さ方向における形成位置を両面で一致させて形成する。
Next, a method for manufacturing the secondary battery 10 (electrode body 21) configured as described above will be described together with its operation.
As shown in FIG. 4, first, an application step of applying an active material (active material mixture) to both surfaces of a metal foil 26a having a strip shape (long sheet shape) is performed (step S1). As shown in FIG. 5, in the coating process, the active material layer 27 is intermittently formed with the non-coated region 26b sandwiched in the length direction (indicated by arrow Y4) of the metal foil 26a. The active material layer 27 (non-coated region 26b) is formed over the entire width in the width direction (indicated by arrow Y5) of the metal foil 26a having a strip shape, and the formation position in the length direction of the metal foil 26a is matched on both sides. Let it form.
次に、活物質層２７を形成した金属箔２６ａを例えばロールプレス機などを用いて加熱しながらプレスして活物質層２７を圧縮し、帯状の正電極シート２３、及び帯状の負電極シート２４をそれぞれ得る。 Next, the metal foil 26a on which the active material layer 27 is formed is pressed while being heated using, for example, a roll press machine to compress the active material layer 27, and the belt-like positive electrode sheet 23 and the belt-like negative electrode sheet 24 are compressed. Get each.
次に、図４に示すように、帯状の各電極シート２３，２４をそれぞれ捲き取り装置などによって捲き取ることにより、帯状の各電極シート２３，２４を個別にロール状に捲回して電極ロール３５を形成する捲き取り工程を行う（ステップＳ２）。 Next, as shown in FIG. 4, the strip-shaped electrode sheets 23 and 24 are individually wound up by a scraping device or the like, so that the strip-shaped electrode sheets 23 and 24 are individually wound into a roll shape to form an electrode roll 35. A scraping process is performed to form (step S2).
図５に示すように、電極ロール３５は、当該電極ロール３５の状態で次工程を行う迄の間、保存（保管）することができる。このため、帯状の各電極シート２３，２４を電極ロール３５としない場合と比較して、各電極シート２３，２４の保管（保存）スペースを小さくすることができるとともに、運搬を容易にすることができる。そして、帯状の各電極シート２３，２４は、電極ロール３５とされている間に当該電極ロール３５の周方向に沿って湾曲するように癖付けされる。 As shown in FIG. 5, the electrode roll 35 can be stored (stored) until the next process is performed in the state of the electrode roll 35. For this reason, compared with the case where each strip | belt-shaped electrode sheet 23 and 24 is not used as the electrode roll 35, while being able to make the storage space of each electrode sheet 23 and 24 small, it can make conveyance easy. it can. Each of the belt-like electrode sheets 23 and 24 is brazed so as to be curved along the circumferential direction of the electrode roll 35 while being formed as the electrode roll 35.
次に、図４に示すように、帯状の各電極シート２３，２４をそれぞれ打ち抜き加工することにより、矩形の各電極シート２３，２４を形成する打ち抜き工程を行う（ステップＳ３）。図５に示すように、帯状の各電極シート２３，２４における打ち抜き位置３６は、帯状の各電極シート２３，２４にそれぞれ形成した非塗布領域２６ｂを打ち抜くことにより、電極タブ２３ａ，２４ａが各々形成される位置に調節される。 Next, as shown in FIG. 4, a punching process for forming the rectangular electrode sheets 23 and 24 is performed by punching the strip-shaped electrode sheets 23 and 24, respectively (step S3). As shown in FIG. 5, the punching positions 36 in the strip-shaped electrode sheets 23 and 24 are formed by punching the non-application areas 26b formed in the strip-shaped electrode sheets 23 and 24, respectively, thereby forming the electrode tabs 23a and 24a. Adjusted to the position.
ここで、第１積層体２５ａに用いられる正電極シート２３と、第２積層体２５ｂに用いられる正電極シート２３とは、正電極タブ２３ａの湾曲方向が反対方向である点を除いて同一構成である。このため、打ち抜き工程（ステップＳ３）では、第１積層体２５ａ用の正電極シート２３と、第２積層体２５ｂ用の正電極シート２３とを、帯状をなす正電極シート２３（電極ロール３５）の幅方向において対称に打ち抜き加工して形成する。第１積層体２５ａ用の負電極シート２４、及び第２積層体２５ｂ用の負電極シート２４についても同様である。 Here, the positive electrode sheet 23 used for the first stacked body 25a and the positive electrode sheet 23 used for the second stacked body 25b have the same configuration except that the bending direction of the positive electrode tab 23a is opposite. It is. For this reason, in the punching step (step S3), the positive electrode sheet 23 for the first laminated body 25a and the positive electrode sheet 23 for the second laminated body 25b are formed into a belt-like positive electrode sheet 23 (electrode roll 35). Are formed by punching symmetrically in the width direction. The same applies to the negative electrode sheet 24 for the first stacked body 25a and the negative electrode sheet 24 for the second stacked body 25b.
このように、本実施形態では、電極ロール３５とすることで付けられた湾曲する癖を、例えばプレスなどによって取り除くことなく打ち抜き加工して矩形の各電極シート２３，２４を形成している。このため、図６に示すように、切り出された各電極シート２３，２４は、電極ロール３５の周方向に沿って湾曲する癖が残存した状態とされている。 Thus, in this embodiment, the rectangular electrode sheets 23 and 24 are formed by punching without bending the curled wrinkles attached by using the electrode roll 35 with, for example, a press. For this reason, as shown in FIG. 6, the cut out electrode sheets 23 and 24 are in a state in which wrinkles that curve along the circumferential direction of the electrode roll 35 remain.
したがって、本実施形態では、上述した捲き取り工程（ステップＳ２）が、正電極タブ２３ａの少なくとも基端部が正電極シート２３の面に垂直な方向に湾曲するように癖付けする癖付け工程となる。また、捲き取り工程（ステップＳ２）が、負電極タブ２４ａの少なくとも基端部が負電極シート２４の面に垂直な方向に湾曲するように癖付けする癖付け工程となる。そして、本実施形態では、電極ロール３５を形成する捲き取り工程と、癖付け工程とを兼ねることで、別途癖付け工程を行う場合と比較して、作業時間（工数）が長くなることを好適に抑制している。 Accordingly, in the present embodiment, the above-described scoring step (step S2) includes a brazing step of brazing so that at least the base end portion of the positive electrode tab 23a is curved in a direction perpendicular to the surface of the positive electrode sheet 23; Become. Further, the scraping step (step S2) is a brazing step for brazing so that at least the base end portion of the negative electrode tab 24a is curved in a direction perpendicular to the surface of the negative electrode sheet 24. And in this embodiment, it is suitable that the working time (man-hour) becomes long compared with the case where a separate brazing process is performed by combining the scraping process which forms the electrode roll 35, and a brazing process. Is suppressed.
次に、図４に示すように、セパレータ２２を介在させた状態で、正電極シート２３→負電極シート２４→正電極シート２３→…→正電極シート２３→負電極シート２４の順に、セパレータ２２、及び各電極シート２３，２４を積層して積層体２５ａ，２５ｂを各々形成する積層工程を行う（ステップＳ４）。この積層工程において、第１積層体２５ａを形成する場合には、第１積層体２５ａ用の各電極シート２３，２４を積層する一方で、第２積層体２５ｂを形成する場合には、第２積層体２５ｂ用の各電極シート２３，２４を積層する。 Next, as shown in FIG. 4, with the separator 22 interposed, the separator 22 in the order of the positive electrode sheet 23 → the negative electrode sheet 24 → the positive electrode sheet 23 →... → the positive electrode sheet 23 → the negative electrode sheet 24. And the lamination process which laminates | stacks each electrode sheet 23 and 24 and forms each of the laminated bodies 25a and 25b is performed (step S4). In this lamination step, when forming the first laminate 25a, the electrode sheets 23 and 24 for the first laminate 25a are laminated, while when forming the second laminate 25b, the second laminate 25b is formed. The electrode sheets 23 and 24 for the laminate 25b are laminated.
詳しく説明すると、図６に示すように、積層工程では、全ての各電極シート２３，２４を、正極面Ｍ２側（負極面Ｍ１とは反対側）に湾曲させるように積層する。即ち、積層工程では、正電極タブ群２８を構成する全ての正電極タブ２３ａの基端部の湾曲方向を正電極タブ群２８毎に同一方向に揃えるとともに、負電極タブ群２９を構成する全ての負電極タブ２４ａの基端部の湾曲方向を負電極タブ群２９毎に同一方向に揃える。 More specifically, as shown in FIG. 6, in the laminating step, all the electrode sheets 23 and 24 are laminated so as to bend toward the positive electrode surface M2 side (the opposite side to the negative electrode surface M1). That is, in the stacking step, the bending directions of the base end portions of all the positive electrode tabs 23a constituting the positive electrode tab group 28 are aligned in the same direction for each positive electrode tab group 28, and all of the negative electrode tab group 29 are constituted. The bending direction of the base end portion of the negative electrode tab 24 a is aligned in the same direction for each negative electrode tab group 29.
このため、各積層体２５ａ，２５ｂの上端部Ｅには、全ての正電極タブ２３ａを同一方向に湾曲させた正電極タブ群２８、及び全ての負電極タブ２４ａを同一方向に湾曲させた負電極タブ群２９が延出形成される。また、各積層体２５ａ，２５ｂにおいて、正電極タブ群２８と負電極タブ群２９と同一方向に湾曲される。なお、正電極タブ群２８及び負電極タブ群２９の湾曲方向は、第１積層体２５ａと第２積層体２５ｂとで反対方向となる。 For this reason, the positive electrode tab group 28 in which all the positive electrode tabs 23a are curved in the same direction and the negative electrode in which all the negative electrode tabs 24a are curved in the same direction are provided at the upper end E of each stacked body 25a, 25b. An electrode tab group 29 is formed to extend. Further, in each of the stacked bodies 25a and 25b, the positive electrode tab group 28 and the negative electrode tab group 29 are bent in the same direction. The bending directions of the positive electrode tab group 28 and the negative electrode tab group 29 are opposite in the first stacked body 25a and the second stacked body 25b.
そして、図７に示すように、負極面Ｍ１が相互に対向して隣り合うように、各積層体２５ａ，２５ｂを積層して電極体２１を形成する。換言すれば、積層工程では、複数の正電極タブ群２８、及び複数の負電極タブ群２９を電極体２１における積層方向に隣り合うように配置するとともに、隣り合わせる正電極タブ群２８同士、及び隣り合わせる負電極タブ群２９同士で湾曲方向が反対方向となるように各積層体２５ａ，２５ｂ（各電極シート２３，２４）を積層する。 Then, as shown in FIG. 7, the electrode bodies 21 are formed by stacking the stacked bodies 25a and 25b so that the negative electrode surfaces M1 face each other and are adjacent to each other. In other words, in the laminating step, a plurality of positive electrode tab groups 28 and a plurality of negative electrode tab groups 29 are arranged adjacent to each other in the laminating direction in the electrode body 21, and adjacent positive electrode tab groups 28, and The laminated bodies 25a and 25b (each electrode sheet 23 and 24) are laminated so that the negative electrode tab groups 29 adjacent to each other have opposite bending directions.
これにより、電極体２１の上端部Ｅに形成された各正電極タブ群２８は、正電極タブ群２８から見て隣り合う正電極タブ群２８に向かう方向に凸となるように湾曲した状態となる。同様に、電極体２１の上端部Ｅに形成された各負電極タブ群２９は、負電極タブ群２９から見て隣り合う負電極タブ群２９に向かう方向に凸となるように湾曲した状態となる。即ち、電極体２１において、正電極タブ群２８及び負電極タブ群２９の湾曲方向は、各積層体２５ａ，２５ｂで反対方向となる。このため、本実施形態の電極体２１では、各正電極タブ群２８の間、及び各負電極タブ群２９の間に空間（隙間）Ｓが形成される。 Accordingly, each positive electrode tab group 28 formed on the upper end E of the electrode body 21 is curved so as to be convex in a direction toward the adjacent positive electrode tab group 28 when viewed from the positive electrode tab group 28. Become. Similarly, each negative electrode tab group 29 formed on the upper end E of the electrode body 21 is curved so as to protrude in the direction toward the adjacent negative electrode tab group 29 when viewed from the negative electrode tab group 29. Become. That is, in the electrode body 21, the bending directions of the positive electrode tab group 28 and the negative electrode tab group 29 are opposite to each other in the stacked bodies 25a and 25b. For this reason, in the electrode body 21 of this embodiment, spaces (gap) S are formed between the positive electrode tab groups 28 and between the negative electrode tab groups 29.
そして、図４に示すように、集電端子３０を各正電極タブ群２８の間に、集電端子３１を各負電極タブ群２９の間に挿入し、配置する挿入工程を行う（ステップＳ５）。詳しく説明すると、図７に示すように、挿入工程では、各正電極タブ群２８の間に形成された空間Ｓに集電端子３０を挿入し、各正電極タブ群２８の間に集電端子３０を配置する。このとき集電端子３０は、接続面３０ａの各々が各正電極タブ群２８の面方向に沿うように配置する。また、挿入工程では、各負電極タブ群２９の間に形成された空間Ｓに集電端子３１を挿入し、各負電極タブ群２９の間に集電端子３１を配置する。このとき、集電端子３１は、接続面３１ａの各々が各負電極タブ群２９の面方向に沿うように配置する。 Then, as shown in FIG. 4, an insertion step of inserting and arranging the current collecting terminals 30 between the respective positive electrode tab groups 28 and the current collecting terminals 31 between the respective negative electrode tab groups 29 is performed (step S5). ). More specifically, as shown in FIG. 7, in the insertion step, the current collecting terminals 30 are inserted into the spaces S formed between the positive electrode tab groups 28, and the current collecting terminals are interposed between the positive electrode tab groups 28. 30 is arranged. At this time, the current collecting terminals 30 are arranged so that each of the connection surfaces 30 a is along the surface direction of each positive electrode tab group 28. In the insertion step, the current collecting terminals 31 are inserted into the spaces S formed between the negative electrode tab groups 29, and the current collecting terminals 31 are arranged between the negative electrode tab groups 29. At this time, the current collecting terminals 31 are arranged so that each of the connection surfaces 31 a is along the surface direction of each negative electrode tab group 29.
このように、本実施形態の電極体２１では、予め湾曲するように癖付けした各電極シート２３，２４を積層して各積層体２５ａ，２５ｂを形成するとともに、この各積層体２５ａ，２５ｂを組み合わせて電極体２１を形成することで各正電極タブ群２８の間、及び各負電極タブ群２９の間に空間Ｓを容易に設けることができる。そして、各正電極タブ群２８の間に形成された空間Ｓに集電端子３０を挿入することで、各正電極タブ群２８の間に集電端子３０を容易に配置できる。同様に、各負電極タブ群２９の間に集電端子３１を容易に配置できる。 As described above, in the electrode body 21 of the present embodiment, the electrode sheets 23 and 24 that are brazed in advance to be curved are stacked to form the stacked bodies 25a and 25b, and the stacked bodies 25a and 25b are formed. By forming the electrode body 21 in combination, the space S can be easily provided between the positive electrode tab groups 28 and between the negative electrode tab groups 29. And the current collection terminal 30 can be easily arrange | positioned between each positive electrode tab group 28 by inserting the current collection terminal 30 in the space S formed between each positive electrode tab group 28. Similarly, the current collecting terminals 31 can be easily arranged between the negative electrode tab groups 29.
例えば、予め癖付けしていない電極シート２３，２４を積層して電極体２１を形成した場合には、層状をなす複数の正電極タブ２３ａを前後方向に分割して２つの正電極タブ群２８を形成し、この２つの正電極タブ群２８の間に空間Ｓを形成する必要がある。しかしながら、癖付けされていない複数の正電極タブ２３ａを分割しつつ寄せ集める場合には、各正電極タブ２３ａに対して均等に力を加えることが難しく、特定の正電極タブ２３ａに集中して力が加わった場合に、金属箔２６ａにおける活物質層２７が形成された領域と非塗布領域２６ｂとの境界部分に負荷を与えてしまう虞がある。このような問題は、負電極タブ群２９を形成しようとする場合についても同様に生じ得る。 For example, when the electrode body 21 is formed by laminating electrode sheets 23 and 24 that have not been brazed in advance, a plurality of positive electrode tabs 23a having a layer shape are divided in the front-rear direction to form two positive electrode tab groups 28. It is necessary to form a space S between the two positive electrode tab groups 28. However, when a plurality of positive electrode tabs 23a that are not brazed are gathered while being divided, it is difficult to apply a force evenly to each positive electrode tab 23a, and it is concentrated on a specific positive electrode tab 23a. When a force is applied, there is a possibility that a load is applied to the boundary portion between the region where the active material layer 27 is formed and the non-application region 26b in the metal foil 26a. Such a problem can occur in the same manner when the negative electrode tab group 29 is to be formed.
これに対して本実施形態では、予め湾曲するように癖付けした正電極シート２３を積層することにより、各積層体２５ａ，２５ｂに正電極タブ群２８を形成している。このため、本実施形態では、各積層体２５ａ，２５ｂを組み合わせることで、電極体２１に２つの正電極タブ群２８を形成できるとともに、同時に各正電極タブ群２８の間に空間Ｓを設けることができる。同様に、本実施形態では、予め湾曲するように癖付けした負電極シート２４を積層することにより、各積層体２５ａ，２５ｂに負電極タブ群２９を形成している。したがって、本実施形態では、正電極タブ群２８及び負電極タブ群２９を形成する際に金属箔２６ａが負荷により破損してしまうことを好適に抑制できるとともに、各電極タブ群２８，２９を形成する分だけ、作業時間（工数）が長くなることを抑制している。 On the other hand, in this embodiment, the positive electrode tab group 28 is formed in each laminated body 25a, 25b by laminating | stacking the positive electrode sheet | seat 23 brazed so that it might curve beforehand. For this reason, in the present embodiment, by combining the stacked bodies 25a and 25b, the two positive electrode tab groups 28 can be formed in the electrode body 21, and at the same time, the space S is provided between the positive electrode tab groups 28. Can do. Similarly, in this embodiment, the negative electrode tab group 29 is formed in each laminated body 25a, 25b by laminating | stacking the negative electrode sheet 24 brazed so that it might curve beforehand. Therefore, in this embodiment, when forming the positive electrode tab group 28 and the negative electrode tab group 29, it can suppress suitably that the metal foil 26a breaks with load, and each electrode tab group 28 and 29 is formed. As a result, the working time (man-hours) is prevented from increasing.
次に、図４に示すように、集電端子３０と各正電極タブ群２８、及び集電端子３１と負電極タブ群２９を接合する接合工程を行う（ステップＳ６）。図３に示すように、接合工程では、集電端子３０の各接続面３０ａに対してそれぞれ正電極タブ群２８を寄せ集めつつ接合する。この場合、集電端子３０の各接続面３０ａには、各積層体２５ａ，２５ｂの対向面とは反対（隣り合う正電極タブ群２８と離れる方向側）側に配置される正電極タブ２３ａの先端部側が接続面３０ａに対してならうように接合される。 Next, as shown in FIG. 4, a joining step for joining the current collecting terminal 30 and each positive electrode tab group 28, and the current collecting terminal 31 and the negative electrode tab group 29 is performed (step S6). As shown in FIG. 3, in the joining step, the positive electrode tab group 28 is joined to each connection surface 30 a of the current collecting terminal 30 while being gathered together. In this case, each connection surface 30a of the current collecting terminal 30 has positive electrode tabs 23a arranged on the side opposite to the facing surfaces of the stacked bodies 25a and 25b (on the side away from the adjacent positive electrode tab group 28). It joins so that the front-end | tip part side may follow with respect to the connection surface 30a.
このため、各正電極タブ２３ａにおいて、接続面３０ａとの接合部３７と、当該接合部３７とは異なる部分とがなす角度θは、各積層体２５ａ，２５ｂの対向方向の外側に配置される正電極タブ２３ａのほうが、内側に配置される正電極タブ２３ａよりも１８０°に近くなる。負電極タブ群２９と集電端子３１との接合についても同様である。したがって、本実施形態では、各積層体２５ａ，２５ｂの対向面とは反対側に配置される正電極タブ２３ａ及び負電極タブ２４ａが大きく屈曲してしまうことを抑制できる。 For this reason, in each positive electrode tab 23a, the angle θ formed by the joint portion 37 with the connection surface 30a and a portion different from the joint portion 37 is disposed on the outer side in the facing direction of the stacked bodies 25a and 25b. The positive electrode tab 23a is closer to 180 ° than the positive electrode tab 23a disposed inside. The same applies to the joining of the negative electrode tab group 29 and the current collecting terminal 31. Therefore, in this embodiment, it can suppress that the positive electrode tab 23a and the negative electrode tab 24a which are arrange | positioned on the opposite side to the opposing surface of each laminated body 25a, 25b bent greatly.
そして、図３に示すように、各積層体２５ａ，２５ｂに形成された正電極タブ群２８には、接合部３７とは異なる部分（基端部側）について湾曲する癖が残存することにより湾曲部２８ａが形成される。同様に、図１に示すように、各積層体２５ａ，２５ｂに形成された負電極タブ群２９には、負電極タブ２４ａの基端部側が湾曲する湾曲部２９ａが形成される。 As shown in FIG. 3, the positive electrode tab group 28 formed in each of the stacked bodies 25 a and 25 b is curved due to remaining wrinkles that curve at a portion (base end side) different from the joint portion 37. A portion 28a is formed. Similarly, as shown in FIG. 1, in the negative electrode tab group 29 formed in each of the stacked bodies 25a and 25b, a curved portion 29a in which the base end side of the negative electrode tab 24a is curved is formed.
次に、図４に示すように、電極体２１、本体部材１２、蓋部材１３、正極端子１５、及び負極端子１６を組み付ける組み付け工程を行う（ステップＳ７）。図１に示すように、組み付け工程では、集電端子３０と正極端子１５とを電気的に接続するとともに、集電端子３１と負極端子１６とを電気的に接続する。続けて、電極体２１を本体部材１２に収容するとともに、この本体部材１２には、正極端子１５及び負極端子１６を上面から突出させつつ蓋部材１３が組み付けられる。そして、ケース１１に電解質を充填して、二次電池１０が完成される。 Next, as shown in FIG. 4, an assembling process for assembling the electrode body 21, the main body member 12, the lid member 13, the positive electrode terminal 15, and the negative electrode terminal 16 is performed (step S7). As shown in FIG. 1, in the assembly process, the current collecting terminal 30 and the positive electrode terminal 15 are electrically connected, and the current collecting terminal 31 and the negative electrode terminal 16 are electrically connected. Subsequently, the electrode body 21 is accommodated in the main body member 12, and the lid member 13 is assembled to the main body member 12 with the positive electrode terminal 15 and the negative electrode terminal 16 protruding from the upper surface. Then, the case 11 is filled with an electrolyte to complete the secondary battery 10.
したがって、本実施形態によれば、以下のような効果を得ることができる。
（１）電極体２１に形成される各正電極タブ群２８は、各正電極タブ群２８を構成する全ての正電極タブ２３ａの基端部を各正電極タブ群２８毎に湾曲させた湾曲部２８ａを有し、各湾曲部２８ａの湾曲方向は、隣り合う正電極タブ群２８同士で反対方向である。このため、各積層体２５ａ，２５ｂにおいて、正電極タブ群２８と正電極タブ群２８との間に空間Ｓ（隙間）を生じさせ、この空間Ｓに集電端子３０や、集電端子３０を接続するための冶具を挿入し易くすることができる。したがって、正電極タブ群２８と集電端子３０とを接続し易くすることができる。負電極タブ群２９及び集電端子３１の接合についても同様である。
Therefore, according to the present embodiment, the following effects can be obtained.
(1) Each positive electrode tab group 28 formed on the electrode body 21 is curved such that the base end portion of all the positive electrode tabs 23a constituting each positive electrode tab group 28 is curved for each positive electrode tab group 28. The bending direction of each bending portion 28a is the opposite direction between the adjacent positive electrode tab groups 28. For this reason, in each laminated body 25a, 25b, a space S (gap) is generated between the positive electrode tab group 28 and the positive electrode tab group 28, and the current collecting terminal 30 and the current collecting terminal 30 are placed in the space S. A jig for connection can be easily inserted. Therefore, the positive electrode tab group 28 and the current collecting terminal 30 can be easily connected. The same applies to the joining of the negative electrode tab group 29 and the current collecting terminal 31.
（２）各湾曲部２８ａの湾曲方向は、正電極タブ群２８から見て隣り合う正電極タブ群２８に向かう方向に凸となる方向の湾曲であり、集電端子３０が各正電極タブ群２８の間に配置される。このため、正電極タブ群２８を構成する正電極タブ２３ａを集電端子３０に寄せ集めて接合する場合には、隣り合う正電極タブ群２８と離れる方向側に配置される正電極タブ２３ａの先端部が集電端子３０の接続面３０ａに対してならうように接続され、当該正電極タブ２３ａが大きく屈曲してしまうことを抑制できる。なお、負電極タブ群２９及び集電端子３１の接合についても同様である。 (2) The bending direction of each bending portion 28a is a curve in a direction that protrudes in the direction toward the adjacent positive electrode tab group 28 when viewed from the positive electrode tab group 28, and the current collecting terminal 30 is connected to each positive electrode tab group. 28. For this reason, when the positive electrode tabs 23a constituting the positive electrode tab group 28 are gathered and joined to the current collecting terminals 30, the positive electrode tabs 23a arranged on the side away from the adjacent positive electrode tab group 28 are connected. The tip end portion is connected to follow the connection surface 30a of the current collecting terminal 30, and the positive electrode tab 23a can be prevented from being greatly bent. The same applies to the joining of the negative electrode tab group 29 and the current collecting terminal 31.
（３）複数の正電極シート２３及び負電極シート２４を積層して各積層体２５ａ，２５ｂを形成するとともに、当該各積層体２５ａ，２５ｂを構成する電極シートのうち積層方向の最も外側の電極シートを負電極シート２４としている。そして、この各積層体２５ａ，２５ｂにおける負電極シート２４同士を対向させるようにして各積層体２５ａ，２５ｂを組み合わせることで、容易に電極体２１を形成することができる。 (3) A plurality of positive electrode sheets 23 and negative electrode sheets 24 are stacked to form the respective stacked bodies 25a and 25b, and the outermost electrode in the stacking direction among the electrode sheets constituting the respective stacked bodies 25a and 25b. The sheet is a negative electrode sheet 24. And the electrode body 21 can be easily formed by combining each laminated body 25a, 25b so that the negative electrode sheets 24 in each laminated body 25a, 25b may be made to oppose.
（４）特に本実施形態では、各積層体２５ａ，２５ｂにおける負極面Ｍ１（負電極シート２４）同士を対向させるようにして組み合わせることで、湾曲部２８ａ及び湾曲部２９ａの湾曲方向を各積層体２５ａ，２５ｂ同士で反対方向とし、且つ各正電極タブ群２８の間、及び各負電極タブ群２９の間に、簡便に空間Ｓを形成することができる。 (4) Particularly in the present embodiment, the bending directions of the bending portion 28a and the bending portion 29a are adjusted by combining the negative electrode surfaces M1 (negative electrode sheets 24) of the stacked bodies 25a and 25b so as to face each other. It is possible to easily form a space S between the positive electrode tab groups 28 and between the negative electrode tab groups 29 in the opposite directions between 25a and 25b.
（５）仮に正極面Ｍ２同士を対向させて各積層体２５ａ，２５ｂを積層する場合には、第１積層体２５ａの正電極シート２３と、第２積層体２５ｂの正電極シート２３との間に負電極シート２４が存在しなくなる。特に、二次電池１０をリチウムイオン二次電池として構成した場合には、正極面Ｍ２側に配置された正電極シート２３から放出されるリチウムイオンを吸蔵することができず、各積層体２５ａ，２５ｂの間で金属リチウムが析出する可能性がある。これに対して、本実施形態では、負極面Ｍ１同士を対向させるように各積層体２５ａ，２５ｂを積層することにより、このような問題を好適に解決しつつも、各正電極タブ群２８の間や各負電極タブ群２９の間に空間Ｓを容易に設けることを可能としている。 (5) If the stacked bodies 25a and 25b are stacked with the positive electrode surfaces M2 facing each other, the positive electrode sheet 23 of the first stacked body 25a and the positive electrode sheet 23 of the second stacked body 25b Thus, the negative electrode sheet 24 does not exist. In particular, when the secondary battery 10 is configured as a lithium ion secondary battery, the lithium ions released from the positive electrode sheet 23 disposed on the positive electrode surface M2 side cannot be occluded, and the stacked bodies 25a, There is a possibility that metallic lithium is deposited between 25b. On the other hand, in the present embodiment, by laminating each of the stacked bodies 25a and 25b so that the negative electrode surfaces M1 face each other, the above-described problems can be preferably solved while the positive electrode tab groups 28 are The space S can be easily provided between the negative electrode tab groups 29.
（６）帯状をなす金属箔２６ａの両表面に対して活物質を塗布することにより、両表面に活物質層２７を設けた各電極シート２３，２４を形成する。そして、打ち抜き工程（ステップＳ３）では、電極ロール３５とした帯状の正電極シート２３及び負電極シート２４をその幅方向において対称に打ち抜き加工し、第１積層体２５ａ用、及び第２積層体２５ｂ用の各電極シート２３，２４を形成している。したがって、第１積層体２５ａと第２積層体２５ｂとで、電極ロール３５における各電極シート２３，２４の巻き方向を異ならせる必要がなく、工程を簡略化できる。 (6) By applying the active material to both surfaces of the strip-shaped metal foil 26a, the electrode sheets 23 and 24 provided with the active material layer 27 on both surfaces are formed. In the punching step (step S3), the strip-like positive electrode sheet 23 and the negative electrode sheet 24, which are the electrode rolls 35, are punched symmetrically in the width direction, and are used for the first laminate 25a and the second laminate 25b. Each electrode sheet 23, 24 is formed. Therefore, it is not necessary to make the winding directions of the electrode sheets 23 and 24 in the electrode roll 35 different between the first laminate 25a and the second laminate 25b, and the process can be simplified.
（７）正電極タブ群２８と集電端子３０、及び負電極タブ群２９と集電端子３１を接続し易くすることができることによって、二次電池１０としての生産効率を向上させることができる。 (7) Since the positive electrode tab group 28 and the current collecting terminal 30 and the negative electrode tab group 29 and the current collecting terminal 31 can be easily connected, the production efficiency of the secondary battery 10 can be improved.
（８）捲き取り工程（癖付け工程）により、予め正電極シート２３（正電極タブ２３ａ）及び負電極シート２４（負電極タブ２４ａ）が湾曲するように癖付けする。そして、積層工程では、複数の正電極タブ群２８を積層方向に隣り合うように配置し、各正電極タブ群２８を構成する全ての正電極タブ２３ａの湾曲方向を正電極タブ群２８毎に同一方向に揃えるとともに、隣り合わせる正電極タブ群２８同士で湾曲方向が反対方向となるように癖付けした各電極シート２３，２４を積層する。このため、隣り合わせる正電極タブ群２８（各積層体２５ａ，２５ｂ）同士で湾曲方向が反対方向となることから、隣り合う正電極タブ群２８において、正電極タブ群２８と正電極タブ群２８との間に空間（隙間）Ｓを生じさせ、正電極タブ群２８（正電極タブ２３ａ）の間に集電端子３０や、集電端子３０を接続するための冶具を挿入し易くすることができる。したがって、正電極タブ群２８と集電端子３０とを容易に接続できる。なお、負電極タブ群２９及び集電端子３１の接合についても同様である。 (8) The positive electrode sheet 23 (positive electrode tab 23a) and the negative electrode sheet 24 (negative electrode tab 24a) are preliminarily brazed by a scraping process (brazing process). In the stacking step, a plurality of positive electrode tab groups 28 are arranged adjacent to each other in the stacking direction, and the bending direction of all the positive electrode tabs 23a constituting each positive electrode tab group 28 is set for each positive electrode tab group 28. The electrode sheets 23 and 24, which are aligned in the same direction and are brazed so that the adjacent positive electrode tab groups 28 are opposite to each other in the bending direction, are stacked. Therefore, the adjacent positive electrode tab groups 28 (respective laminates 25a and 25b) have opposite bending directions. Therefore, in the adjacent positive electrode tab group 28, the positive electrode tab group 28 and the positive electrode tab group 28 are combined. A space (gap) S is generated between the positive electrode tab group 28 (positive electrode tab 23a), and it is easy to insert the current collecting terminal 30 and a jig for connecting the current collecting terminal 30 between them. it can. Therefore, the positive electrode tab group 28 and the current collecting terminal 30 can be easily connected. The same applies to the joining of the negative electrode tab group 29 and the current collecting terminal 31.
（９）捲き取り工程（癖付け工程）において、帯状の各電極シート２３，２４をロール状に捲回して癖付けする。このため、例えば帯状の各電極シート２３，２４を保管するために電極ロール３５とした際に付けられた癖を利用することができる。したがって、特別な工程を設けることなく、正電極シート２３（正電極タブ２３ａ）及び負電極シート２４（負電極タブ２４ａ）が湾曲するように癖付けできる。 (9) In the scraping process (brazing process), the belt-like electrode sheets 23 and 24 are wound in a roll shape and brazed. For this reason, for example, it is possible to use the wrinkle attached when the electrode roll 35 is used to store the belt-like electrode sheets 23 and 24. Therefore, the positive electrode sheet 23 (positive electrode tab 23a) and the negative electrode sheet 24 (negative electrode tab 24a) can be brazed without providing a special process.
実施形態は前記に限定されるものではなく、例えば、次のように具体化してもよい。
○ 図８に示すように、各湾曲部２８ａの湾曲方向は、各積層体２５ａ，２５ｂの対向面へ向かう方向とされており、集電端子３０は、隣り合う各積層体２５ａ，２５ｂに形成された各正電極タブ群２８の間において、正電極タブ群２８を接続される接続面３０ａが正電極タブ群２８の面方向に沿うように配置されていてもよい。即ち、各湾曲部２８ａの湾曲方向は、正電極タブ群２８から見て隣り合う正電極タブ群２８と離れる方向に凸となる方向の湾曲であってもよい。
The embodiment is not limited to the above, and may be embodied as follows, for example.
As shown in FIG. 8, the bending direction of each bending portion 28a is a direction toward the facing surface of each stacked body 25a, 25b, and the current collecting terminal 30 is formed in each adjacent stacked body 25a, 25b. Between each of the positive electrode tab groups 28 formed, the connection surface 30 a to which the positive electrode tab group 28 is connected may be disposed along the surface direction of the positive electrode tab group 28. In other words, the bending direction of each bending portion 28a may be a curve that is convex in a direction away from the adjacent positive electrode tab group 28 when viewed from the positive electrode tab group 28.
これによれば、各正電極タブ群２８を構成する正電極タブ２３ａを集電端子３０に寄せ集めて接合する場合には、各積層体２５ａ，２５ｂの対向面側（隣り合う正電極タブ群２８に向かう方向側）に配置される正電極タブ２３ａの先端部側が接続面３０ａに対してならうように接合される。このため、各正電極タブ２３ａにおいて、接合部３７と当該接合部３７とは異なる部分とがなす角度θは、各積層体２５ａ，２５ｂの対向面側に配置される正電極タブ２３ａのほうが、反対側に配置される正電極タブ２３ａよりも１８０°に近くなる。したがって、本別例では、各積層体２５ａ，２５ｂの対向面側に配置される正電極タブ２３ａが大きく屈曲してしまうことを抑制できる。なお、負電極タブ群２９と集電端子３１との接合についても同様に具体化できる。 According to this, when the positive electrode tabs 23a constituting each positive electrode tab group 28 are gathered together and joined to the current collecting terminals 30, the opposing surface side (adjacent positive electrode tab group of each stacked body 25a, 25b). The tip end side of the positive electrode tab 23a arranged on the direction side toward 28) is joined so as to follow the connection surface 30a. For this reason, in each positive electrode tab 23a, the angle θ formed between the joint portion 37 and a portion different from the joint portion 37 is such that the positive electrode tab 23a disposed on the opposite surface side of each stacked body 25a, 25b is It is closer to 180 ° than the positive electrode tab 23a arranged on the opposite side. Therefore, in this example, it can suppress that the positive electrode tab 23a arrange | positioned at the opposing surface side of each laminated body 25a, 25b bent greatly. The joining of the negative electrode tab group 29 and the current collecting terminal 31 can be similarly realized.
○ 図９に示すように、各湾曲部２８ａの湾曲方向は、正電極タブ群２８から見て隣り合う正電極タブ群２８に向かう方向に凸となる方向の湾曲であり、集電端子３０は複数（ここでは２つ）の集電部３０ｂを有し、この集電部３０ｂは隣り合う正電極タブ群２８における正電極タブ群２８から見て隣り合う正電極タブ群２８と離れる方向側に配置されていてもよい。この場合、各集電部３０ｂは、一体に形成されていてもよく、正極端子１５に対して各別に形成されていてもよい。 As shown in FIG. 9, the bending direction of each bending portion 28a is a curve in a direction that is convex in the direction toward the adjacent positive electrode tab group 28 when viewed from the positive electrode tab group 28, and the current collecting terminal 30 is There are a plurality (two in this case) of current collectors 30b, and these current collectors 30b are located on the side away from the adjacent positive electrode tab group 28 when viewed from the positive electrode tab group 28 in the adjacent positive electrode tab group 28. It may be arranged. In this case, each current collector 30 b may be formed integrally or may be formed separately for each positive electrode terminal 15.
これによれば、各正電極タブ群２８を構成する正電極タブ２３ａを集電端子３０に寄せ集めて接合する場合には、各積層体２５ａ，２５ｂの対向面とは反対側（隣り合う正電極タブ群２８と離れる方向側）に配置される正電極タブ２３ａの先端部側が接続面３０ａに対してならうように接合される。このため、各正電極タブ２３ａにおいて、接合部３７と当該接合部３７とは異なる部分とがなす角度θは、各積層体２５ａ，２５ｂの対向面とは反対側に配置される正電極タブ２３ａのほうが、対向面側に配置される正電極タブ２３ａよりも１８０°に近くなる。したがって、本別例では、各積層体２５ａ，２５ｂの対向面とは反対側に配置される正電極タブ２３ａが大きく屈曲してしまうことを抑制できる。なお、負電極タブ群２９と集電端子３１との接合についても同様に具体化できる。 According to this, when the positive electrode tabs 23a constituting each positive electrode tab group 28 are gathered together and joined to the current collecting terminals 30, they are opposite to the opposing surfaces of the stacked bodies 25a and 25b (adjacent positive electrodes adjacent to each other). The positive electrode tab 23a arranged on the side away from the electrode tab group 28 is joined so that the tip end side thereof follows the connection surface 30a. For this reason, in each positive electrode tab 23a, the angle θ formed by the joint portion 37 and a portion different from the joint portion 37 is the positive electrode tab 23a disposed on the opposite side to the facing surface of each of the stacked bodies 25a and 25b. This is closer to 180 ° than the positive electrode tab 23a disposed on the opposite surface side. Therefore, in this example, it can suppress that the positive electrode tab 23a arrange | positioned on the opposite side to the opposing surface of each laminated body 25a, 25b bent greatly. The joining of the negative electrode tab group 29 and the current collecting terminal 31 can be similarly realized.
○ 正電極タブ群２８の湾曲部２８ａ、及び負電極タブ群２９の湾曲部２９ａのいずれか一方について省略した構成としてもよい。
○ 捲き取り工程に代えて、ローラを通すことで帯状の各電極シート２３，２４を湾曲するように癖付けする癖付け工程を設けてもよい。
O It is good also as a structure which abbreviate | omitted about either the curved part 28a of the positive electrode tab group 28, or the curved part 29a of the negative electrode tab group 29. FIG.
In place of the scraping step, a brazing step may be provided in which the belt-like electrode sheets 23 and 24 are curved so as to be curved by passing a roller.
○ 癖付けされていない各電極シート２３，２４を打ち抜いて矩形の各電極シート２３，２４を形成したのち、正電極タブ２３ａ及び負電極タブ２４ａをプレスするなどして湾曲するように癖付けしてもよい。 ○ After punching the electrode sheets 23 and 24 which are not brazed to form the rectangular electrode sheets 23 and 24, the positive electrode tab 23a and the negative electrode tab 24a are pressed and brazed so as to be curved. May be.
○ 正電極タブ２３ａを除く正電極シート２３、及び負電極タブ２４ａを除く負電極シート２４について、湾曲する癖を除去する工程を加えてもよい。
○ 電極体２１は、３つ以上の積層体を積層して形成してもよい。即ち、正電極タブ群２８や負電極タブ群２９は２つに限らず３つ以上でもよい。３つ以上の場合であっても、各電極タブが基端部に湾曲部を有し、各湾曲部が隣り合う電極タブ群同士で反対方向に湾曲していればよい。
A step of removing curled wrinkles may be added to the positive electrode sheet 23 excluding the positive electrode tab 23a and the negative electrode sheet 24 excluding the negative electrode tab 24a.
The electrode body 21 may be formed by stacking three or more stacked bodies. That is, the positive electrode tab group 28 and the negative electrode tab group 29 are not limited to two, and may be three or more. Even in the case of three or more, each electrode tab has a curved portion at the base end portion, and each curved portion may be curved in the opposite direction between the adjacent electrode tab groups.
○ 各積層体２５ａ，２５ｂは、セパレータ２２を介在させて、正電極シート２３及び負電極シート２４を蛇腹状に折り曲げて積層してもよい。
○ 積層工程では、各電極シート２３，２４を積層して各積層体２５ａ，２５ｂを一体に形成してもよい。
Each laminated body 25a, 25b may be laminated by folding the positive electrode sheet 23 and the negative electrode sheet 24 in a bellows shape with the separator 22 interposed therebetween.
In the stacking step, the electrode sheets 23 and 24 may be stacked to integrally form the stacked bodies 25a and 25b.
○ ケース１１の形状は、円柱状や、左右方向に扁平な楕円柱状に形成してもよい。
○ 上記実施形態の二次電池１０を車両（例えば産業車両や乗用車両など）に搭載し、車両に装備された発電機により充電する一方で、二次電池１０から供給する電力によりエアコン用のコンプレッサや、車輪を駆動するための電動モータ、或いはカーナビゲーションシステムなどの電装品を駆動してもよい。これによれば、二次電池１０としての生産効率が向上される結果、これを搭載する車両としての生産効率を向上させることができる。
The shape of the case 11 may be formed in a columnar shape or an elliptical column shape that is flat in the left-right direction.
○ The secondary battery 10 of the above embodiment is mounted on a vehicle (for example, an industrial vehicle or a passenger vehicle), and is charged by a generator installed in the vehicle. Alternatively, an electric motor for driving the wheels or an electrical component such as a car navigation system may be driven. According to this, as a result of improving the production efficiency as the secondary battery 10, it is possible to improve the production efficiency as a vehicle on which the secondary battery 10 is mounted.
○ 本発明は、蓄電装置としての電気二重層キャパシタとして具体化してもよい。 The present invention may be embodied as an electric double layer capacitor as a power storage device.
Ｓ２…ステップ（捲き取り工程、癖付け工程）、Ｓ４…ステップ（積層工程）、１０…二次電池（蓄電装置）、２１…電極体、２３…正電極シート（電極）、２３ａ…正電極タブ（電極タブ）、２４…負電極シート（電極）、２４ａ…負電極タブ（電極タブ）、２７…活物質層、２８…正電極タブ群（電極タブ群）、２８ａ…湾曲部、２９…負電極タブ群（電極タブ群）、２９ａ…湾曲部、３０，３１…集電端子（集電部材）、３０ｂ…集電部。 S2 ... Step (blow-off process, brazing process), S4 ... Step (stacking process), 10 ... Secondary battery (power storage device), 21 ... Electrode body, 23 ... Positive electrode sheet (electrode), 23a ... Positive electrode tab (Electrode tab), 24 ... negative electrode sheet (electrode), 24a ... negative electrode tab (electrode tab), 27 ... active material layer, 28 ... positive electrode tab group (electrode tab group), 28a ... curved portion, 29 ... negative Electrode tab group (electrode tab group), 29a ... curved portion, 30, 31 ... current collecting terminal (current collecting member), 30b ... current collecting portion.
Claims (2)
前記電極の端部から延出形成される電極タブの少なくとも基端部が前記電極の面に垂直な方向に湾曲するように癖付けする癖付け工程と、
前記電極を積層する積層工程と、を含み、
前記積層工程では、複数の前記電極タブ群を前記電極の積層方向に隣り合うように配置し、各前記電極タブ群を構成する全ての電極タブの基端部の湾曲方向を各前記電極タブ群毎に同一方向に揃えるとともに隣り合わせる前記電極タブ群同士で湾曲方向が反対方向となるように前記癖付けした電極を積層することを特徴とする接続方法。 An electrode tab group comprising a stacked electrode body in which sheet-like electrodes are stacked and electrode tabs each extending from the end of each electrode are stacked, and a current collecting member are electrically connected A connection method for connecting to
A brazing step of brazing such that at least a base end portion of an electrode tab formed to extend from an end portion of the electrode is curved in a direction perpendicular to the surface of the electrode;
Laminating step of laminating the electrodes,
In the laminating step, a plurality of the electrode tab groups are arranged adjacent to each other in the electrode laminating direction, and the bending direction of the base end portion of all the electrode tabs constituting each electrode tab group is set to each electrode tab group. The connection method characterized by laminating the brazed electrodes so that the electrode tab groups that are aligned in the same direction and adjacent to each other are curved in opposite directions.
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