JP2016012542A - Power storage device - Google Patents
Power storage device Download PDFInfo
- Publication number
- JP2016012542A JP2016012542A JP2014134930A JP2014134930A JP2016012542A JP 2016012542 A JP2016012542 A JP 2016012542A JP 2014134930 A JP2014134930 A JP 2014134930A JP 2014134930 A JP2014134930 A JP 2014134930A JP 2016012542 A JP2016012542 A JP 2016012542A
- Authority
- JP
- Japan
- Prior art keywords
- positive electrode
- negative electrode
- conductive member
- tab
- electrode tab
- 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.)
- Granted
Links
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
- Y02E60/13—Energy storage using capacitors
Abstract
Description
本発明は、蓄電装置に係り、詳しくはタブと導電部材との接合構造に特徴を有する蓄電装置に関する。 The present invention relates to a power storage device, and more particularly to a power storage device characterized by a joint structure between a tab and a conductive member.
二次電池やキャパシタのような蓄電装置は再充電が可能であり、繰り返し使用することができるため電源として広く利用されている。一般に、容量の大きな蓄電装置は電極組立体を収納するケースを備え、そのケース内に電極組立体が収納されている。そして、蓄電装置からの電力の取り出しは、電極組立体の正極及び負極に接続された電極端子を通して行われている。 Power storage devices such as secondary batteries and capacitors are widely used as power sources because they can be recharged and can be used repeatedly. In general, a power storage device having a large capacity includes a case for accommodating an electrode assembly, and the electrode assembly is accommodated in the case. And extraction of the electric power from an electrical storage apparatus is performed through the electrode terminal connected to the positive electrode and negative electrode of an electrode assembly.
電極組立体には、例えば、複数の正極と複数の負極との間にセパレータを介在させた状態で積層した積層型の電極組立体がある。正極及び負極は、それぞれタブと呼ばれる金属箔の部分を有し、複数枚のタブが導電部材（リード）を介して正極端子あるいは負極端子に積層された状態で溶接されている。 As the electrode assembly, for example, there is a stacked electrode assembly in which separators are interposed between a plurality of positive electrodes and a plurality of negative electrodes. Each of the positive electrode and the negative electrode has a metal foil portion called a tab, and a plurality of tabs are welded in a state of being stacked on the positive electrode terminal or the negative electrode terminal via a conductive member (lead).
従来、集電タブ（電極タブ）に応力がかからず、小型化できる積層型リチウムイオン電池及びその製造方法提案されている（特許文献１参照）。特許文献１の製造方法では、図７（ａ）に示すように、正極電極５１及び負極電極５２がセパレータを介して積層された電極組立体５３の正極タブ５４を正極リード５５と溶接する場合、図７（ｂ）に示すように、電極組立体５３の正極タブ５４の反突出側を固定した状態で、電極組立体５３を正極タブ５４が上方向に延びる状態に９０度折り曲げる。そして、複数枚の正極タブ５４の一方の外側に正極リード５５を配置する。 2. Description of the Related Art Conventionally, a stacked lithium ion battery that can be reduced in size without applying stress to a current collecting tab (electrode tab) and a manufacturing method thereof have been proposed (see Patent Document 1). In the manufacturing method of Patent Document 1, as shown in FIG. 7A, when the positive electrode tab 54 of the electrode assembly 53 in which the positive electrode 51 and the negative electrode 52 are stacked via the separator is welded to the positive electrode lead 55, As shown in FIG. 7B, the electrode assembly 53 is bent 90 degrees so that the positive electrode tab 54 extends upward while the opposite side of the positive electrode tab 54 of the electrode assembly 53 is fixed. Then, the positive electrode lead 55 is disposed on one outer side of the plurality of positive electrode tabs 54.
この階段状となった正極タブ５４を、図７（ｃ）に示すように、正極リード５５と溶接ヘッド５６を用いて接続する。その後、図７（ｄ）に示すように湾曲させた電極組立体５３を平板状に戻す。次に正極タブ５４を、この状態に保ち、図７（ｅ）に示すように、正極リード５５を下側に折り曲げる。次いで図７（ｆ）に示すように、正極リード５５の先端を元に戻すようにして、平板状の電極組立体５３と平行となるようにし、正極タブ５４を電極組立体５３の端面に沿って曲げることにより、正極タブ５４に引っ張り応力がかからず、歪のない状態で電極組立体５３の組み立てを行う。負極タブと負極リードについても同様である。 The stepped positive electrode tab 54 is connected using a positive electrode lead 55 and a welding head 56 as shown in FIG. Thereafter, the electrode assembly 53 bent as shown in FIG. Next, the positive electrode tab 54 is maintained in this state, and the positive electrode lead 55 is bent downward as shown in FIG. Next, as shown in FIG. 7 (f), the tip of the positive electrode lead 55 is returned to its original position so as to be parallel to the flat electrode assembly 53, and the positive electrode tab 54 is moved along the end surface of the electrode assembly 53. As a result, the electrode assembly 53 is assembled in a state in which no tensile stress is applied to the positive electrode tab 54 and there is no distortion. The same applies to the negative electrode tab and the negative electrode lead.
ところが、特許文献１の構成では、正極タブ５４は先端が一致する状態に重ねられ、その重ねられた部分が、Ｌ字状に折り曲げられた正極リード５５の基端側に溶接されている。正極リード５５は、基端側が電極組立体５３の正極タブ５４の突出側端面と平行に配置されている。そのため、電極組立体５３を電池のケースに収容した状態において、正極リード５５の基端側端面と電極組立体５３の端面との間に湾曲状態で存在する正極タブ５４の屈曲部分がケースの内壁に接触することを防止するには、屈曲部分の湾曲状態を小さくする必要があり、電極組立体５３の端面からの正極タブ５４の突出量が大きくなる。また、正極タブ５４を正極リード５５へ溶接した後、正極リード５５を折り曲げる必要がある。 However, in the configuration of Patent Document 1, the positive electrode tabs 54 are overlapped so that the distal ends thereof coincide with each other, and the overlapped portion is welded to the proximal end side of the positive electrode lead 55 bent in an L shape. The base end of the positive electrode lead 55 is arranged in parallel with the protruding end surface of the positive electrode tab 54 of the electrode assembly 53. Therefore, when the electrode assembly 53 is housed in the battery case, the bent portion of the positive electrode tab 54 that exists in a curved state between the proximal end surface of the positive electrode lead 55 and the end surface of the electrode assembly 53 is the inner wall of the case. In order to prevent contact with the electrode, it is necessary to reduce the bending state of the bent portion, and the protruding amount of the positive electrode tab 54 from the end face of the electrode assembly 53 increases. Further, after the positive electrode tab 54 is welded to the positive electrode lead 55, it is necessary to bend the positive electrode lead 55.
本発明は、前記の問題に鑑みてなされたものであって、その目的は、電極組立体の端面からのタブの突出量を小さくすることができ、正極導電部材及び負極導電部材の折り曲げ加工を不要にすることができる蓄電装置を提供することにある。 The present invention has been made in view of the above problems, and the object thereof is to reduce the protruding amount of the tab from the end face of the electrode assembly, and to bend the positive electrode conductive member and the negative electrode conductive member. An object of the present invention is to provide a power storage device that can be made unnecessary.
上記課題を解決する蓄電装置は、端部から突出した形状の正極タブを有する正極、及び端部から突出した形状の負極タブを有する負極が互いに絶縁された状態で積層された電極組立体と、前記電極組立体と電気を授受する正極端子及び負極端子と、前記正極タブと前記正極端子とを電気的に接続する正極導電部材と、前記負極タブと前記負極端子とを電気的に接続する負極導電部材と、を備える蓄電装置である。そして、前記正極タブ及び前記負極タブは、それぞれ積層された状態で折り曲げられた第１の折り曲げ部と、前記第１の折り曲げ部よりも前記正極タブ又は前記負極タブの先端側に配置された第２の折り曲げ部と、前記第１の折り曲げ部と前記第２の折り曲げ部との間に配置され、かつ前記電極組立体の積層方向に沿って延設された第１の延設部と、前記第２の折り曲げ部と前記正極タブの先端又は前記負極タブの先端との間に配置され、かつ前記電極組立体の積層方向に沿って延設された第２の延設部とを有し、前記第１の延設部と前記第２の延設部と前記正極導電部材又は前記負極導電部材とが重なる状態に配置され、前記第１の延設部と前記第２の延設部、及び前記正極導電部材又は前記負極導電部材とがそれぞれ接合されている。 A power storage device that solves the above problems is an electrode assembly in which a positive electrode having a positive electrode tab protruding from an end and a negative electrode having a negative electrode tab protruding from an end are stacked in a state of being insulated from each other; A positive electrode terminal and a negative electrode terminal for transferring electricity to and from the electrode assembly; a positive electrode conductive member for electrically connecting the positive electrode tab and the positive electrode terminal; and a negative electrode for electrically connecting the negative electrode tab and the negative electrode terminal And a conductive member. The positive electrode tab and the negative electrode tab are each bent in a stacked state, and the positive electrode tab or the negative electrode tab is disposed closer to the tip side of the negative electrode tab than the first bent portion. Two bent portions, a first extended portion disposed between the first bent portion and the second bent portion, and extending along the stacking direction of the electrode assembly, A second extending portion disposed between the second bent portion and the tip of the positive electrode tab or the tip of the negative electrode tab and extending along the stacking direction of the electrode assembly; The first extending portion, the second extending portion, and the positive electrode conductive member or the negative electrode conductive member are disposed so as to overlap each other, and the first extending portion, the second extending portion, and The positive electrode conductive member or the negative electrode conductive member is joined to each other.
この構成によれば、正極導電部材及び負極導電部材との接触面積を十分に確保するために、正極タブや負極タブの長さを長くした場合でも、正極タブや負極タブの先端部が正極導電部材又は前記負極導電部材からはみ出てケースの内面と接触する虞がない。また、正極タブや負極タブを折り曲げる際に正極導電部材や負極導電部材を折り曲げる必要がない。したがって、電極組立体の端面からの正極タブや負極タブの突出量を小さくすることができ、正極導電部材及び負極導電部材の折り曲げ加工を不要にすることができる。 According to this configuration, in order to ensure a sufficient contact area between the positive electrode conductive member and the negative electrode conductive member, even when the positive electrode tab or the negative electrode tab is lengthened, the tip of the positive electrode tab or the negative electrode tab is positive electrode conductive. There is no possibility of protruding from the member or the negative electrode conductive member and coming into contact with the inner surface of the case. Further, it is not necessary to bend the positive electrode conductive member or the negative electrode conductive member when the positive electrode tab or the negative electrode tab is bent. Therefore, the protruding amount of the positive electrode tab and the negative electrode tab from the end face of the electrode assembly can be reduced, and the bending process of the positive electrode conductive member and the negative electrode conductive member can be made unnecessary.
前記正極タブ及び前記負極タブは、前記電極組立体の厚さ方向において最も外側になるいずれか一方の正極タブ及び負極タブが、他の正極タブ及び他の負極タブの前記第２の折り曲げ部より先端側の部分を覆う状態で、前記正極導電部材又は前記負極導電部材に接合されていることが好ましい。この構成によれば、正極タブ及び負極タブが溶接される際に、重ねられた状態の正極タブ及び負極タブの枚数が少なくなり、溶接に必要なエネルギーが少なくなる。 The positive electrode tab and the negative electrode tab are either one of the positive electrode tab and the negative electrode tab that are on the outermost side in the thickness direction of the electrode assembly, from the second bent portion of the other positive electrode tab and the other negative electrode tab. It is preferable to be joined to the positive electrode conductive member or the negative electrode conductive member so as to cover the tip side portion. According to this configuration, when the positive electrode tab and the negative electrode tab are welded, the number of stacked positive electrode tabs and negative electrode tabs is reduced, and energy required for welding is reduced.
前記第２の延設部には、前記正極導電部材又は前記負極導電部材が配置される側とは反対側に、導電性を有する導電板が配置され、前記正極導電部材又は前記負極導電部材と、前記第１の延設部と、前記第２の延設部と、前記導電板とがそれぞれ溶接されていることが好ましい。この構成によれば、導電板を用いずに、複数枚の正極タブ及び負極タブを、正極導電部材又は負極導電部材と溶接する場合に比べて、正極タブ及び負極タブが溶接用の電極等に直接押圧されることによって傷つく虞がない。 In the second extending portion, a conductive plate having conductivity is arranged on the side opposite to the side where the positive electrode conductive member or the negative electrode conductive member is arranged, and the positive electrode conductive member or the negative electrode conductive member and It is preferable that the first extending portion, the second extending portion, and the conductive plate are welded to each other. According to this configuration, the positive electrode tab and the negative electrode tab are used as welding electrodes and the like as compared with the case where a plurality of positive electrode tabs and negative electrode tabs are welded to the positive electrode conductive member or the negative electrode conductive member without using a conductive plate. There is no risk of being damaged by being pressed directly.
本発明によれば、電極組立体の端面からのタブの突出量を小さくすることができ、正極導電部材及び負極導電部材の折り曲げ加工を不要にすることができる。 According to the present invention, the protruding amount of the tab from the end face of the electrode assembly can be reduced, and the bending process of the positive electrode conductive member and the negative electrode conductive member can be eliminated.
以下、本発明を積層型の電極組立体を備えた二次電池に具体化した一実施形態を図１〜図５にしたがって説明する。
図１に示すように、蓄電装置としての二次電池１０は、有底箱状のケース本体１１ａ及びその開口部を覆う蓋体１１ｂとで構成された四角箱状のケース１１内に、積層型の電極組立体１２及び電解液（図示せず）が収容されている。
Hereinafter, an embodiment in which the present invention is embodied in a secondary battery including a stacked electrode assembly will be described with reference to FIGS.
As shown in FIG. 1, a secondary battery 10 as a power storage device includes a bottomed box-shaped case main body 11 a and a rectangular box-shaped case 11 configured by a lid 11 b covering the opening, and a stacked type. The electrode assembly 12 and the electrolyte (not shown) are accommodated.
図２（ａ），（ｂ），（ｃ）及び図３に示すように、電極組立体１２は、金属箔１３の両面に正極活物質層１４ａを有する複数の矩形シート状の正極１４と、金属箔１３の両面に負極活物質層１５ａを有する複数の矩形シート状の負極１５とが、両者の間にセパレータ１６が介在する状態で積層されている。 2 (a), (b), (c) and FIG. 3, the electrode assembly 12 includes a plurality of rectangular sheet-like positive electrodes 14 having positive electrode active material layers 14a on both surfaces of a metal foil 13, A plurality of rectangular sheet-like negative electrodes 15 having negative electrode active material layers 15a on both surfaces of the metal foil 13 are laminated with a separator 16 interposed therebetween.
セパレータ１６は、正極１４と負極１５との間の電気的絶縁性を確保するため、正極タブ１４ｂ及び負極タブ１５ｂを除いた正極１４及び負極１５の矩形部より大きな矩形状に形成されている。二次電池１０がリチウムイオン二次電池の場合、正極１４用の金属箔１３はアルミニウム箔が好ましく、負極１５用の金属箔１３は銅箔が好ましい。 The separator 16 is formed in a rectangular shape larger than the rectangular portions of the positive electrode 14 and the negative electrode 15 excluding the positive electrode tab 14 b and the negative electrode tab 15 b in order to ensure electrical insulation between the positive electrode 14 and the negative electrode 15. When the secondary battery 10 is a lithium ion secondary battery, the metal foil 13 for the positive electrode 14 is preferably an aluminum foil, and the metal foil 13 for the negative electrode 15 is preferably a copper foil.
正極１４は、金属箔１３の一辺から延出された正極タブ１４ｂを有する。正極タブ１４ｂは、電極組立体１２の一端面（図１において上端面）の左側寄りとなる位置に突設されている。 The positive electrode 14 has a positive electrode tab 14 b extending from one side of the metal foil 13. The positive electrode tab 14b protrudes at a position on the left side of one end surface (the upper end surface in FIG. 1) of the electrode assembly 12.
負極１５は、金属箔１３の一辺から延出された負極タブ１５ｂを有する。負極１５の金属箔１３と、正極１４の金属箔１３とは同じ大きさに形成され、負極活物質層１５ａの面積は正極活物質層１４ａの面積より大きい。負極タブ１５ｂは、電極組立体１２の一端面（図１において上端面）の右側寄りとなる位置に突設されている。 The negative electrode 15 has a negative electrode tab 15 b extending from one side of the metal foil 13. The metal foil 13 of the negative electrode 15 and the metal foil 13 of the positive electrode 14 are formed in the same size, and the area of the negative electrode active material layer 15a is larger than the area of the positive electrode active material layer 14a. The negative electrode tab 15b protrudes from the right end of the one end surface (the upper end surface in FIG. 1) of the electrode assembly 12.
図１に示すように、電極組立体１２はケース１１に収納された状態において、電極組立体１２と電気を授受する正極端子２１及び負極端子２２が蓋体１１ｂから突出する状態に形成されている。正極端子２１及び負極端子２２は、蓋体１１ｂに形成された孔１１ｃに取り付けられたリング状の絶縁部材２３を貫通する状態で設けられている。正極端子２１は正極導電部材２４を介して正極タブ１４ｂに電気的に接続され、負極端子２２は負極導電部材２５を介して負極タブ１５ｂに電気的に接続されている。なお、ケース本体１１ａの内面及び蓋体１１ｂの内面には、絶縁シート１１ｄが取着されている。 As shown in FIG. 1, the electrode assembly 12 is formed in a state in which a positive electrode terminal 21 and a negative electrode terminal 22 that exchange electricity with the electrode assembly 12 protrude from the lid 11 b in a state where the electrode assembly 12 is housed in the case 11. . The positive electrode terminal 21 and the negative electrode terminal 22 are provided in a state of penetrating a ring-shaped insulating member 23 attached to a hole 11c formed in the lid 11b. The positive electrode terminal 21 is electrically connected to the positive electrode tab 14 b via the positive electrode conductive member 24, and the negative electrode terminal 22 is electrically connected to the negative electrode tab 15 b via the negative electrode conductive member 25. An insulating sheet 11d is attached to the inner surface of the case body 11a and the inner surface of the lid body 11b.
すなわち、二次電池１０は、端部から突出した形状の正極タブ１４ｂを有する正極１４、及び端部から突出した形状の負極タブ１５ｂを有する負極１５が互いに絶縁された状態で積層された電極組立体１２と、電極組立体１２と電気を授受する正極端子２１及び負極端子２２と、正極タブ１４ｂと正極端子２１とを電気的に接続する正極導電部材２４と、負極タブ１５ｂと負極端子２２とを電気的に接続する負極導電部材２５と、を備える蓄電装置である。 That is, the secondary battery 10 includes an electrode assembly in which a positive electrode 14 having a positive electrode tab 14b protruding from an end and a negative electrode 15 having a negative electrode tab 15b protruding from an end are stacked in a state where they are insulated from each other. A solid body 12, a positive electrode terminal 21 and a negative electrode terminal 22 that exchange electricity with the electrode assembly 12, a positive electrode conductive member 24 that electrically connects the positive electrode tab 14 b and the positive electrode terminal 21, a negative electrode tab 15 b, and a negative electrode terminal 22 And a negative electrode conductive member 25 that electrically connects the two.
図３に示すように、正極タブ１４ｂは、積層された状態で折り曲げられた第１の折り曲げ部１７ａと、第１の折り曲げ部１７ａの先端側に配置された第２の折り曲げ部１７ｂと、第１の折り曲げ部１７ａと第２の折り曲げ部１７ｂとの間に配置され、かつ電極組立体１２の積層方向に沿って延設された第１の延設部１８ａと、第２の折り曲げ部１７ｂと正極タブ１４ｂの先端との間に配置され、かつ電極組立体１２の積層方向に沿って延設された第２の延設部１８ｂとを有する。そして、第１の延設部１８ａと第２の延設部１８ｂと正極導電部材２４とが重なる状態に配置され、第１の延設部１８ａと第２の延設部１８ｂ、及び正極導電部材２４とがそれぞれ接合されている。 As shown in FIG. 3, the positive electrode tab 14b includes a first bent portion 17a bent in a stacked state, a second bent portion 17b disposed on the distal end side of the first bent portion 17a, A first extending portion 18a disposed between the one bent portion 17a and the second bent portion 17b and extending along the stacking direction of the electrode assembly 12, and a second bent portion 17b. And a second extending portion 18b that is arranged between the positive electrode tab 14b and the electrode assembly 12 in the stacking direction. And the 1st extension part 18a, the 2nd extension part 18b, and the positive electrode conductive member 24 are arrange | positioned in the state which overlaps, the 1st extension part 18a, the 2nd extension part 18b, and the positive electrode conductive member 24 are joined to each other.
また、この実施形態では、第２の延設部１８ｂには、正極導電部材２４が配置される側とは反対側に、導電性を有する導電板としての保護板２６が配置され、正極導電部材２４と、第１の延設部１８ａと、第２の延設部１８ｂと、保護板２６とがそれぞれ溶接されている。なお、正極タブ１４ｂの数は実際は数十枚程度であるが、便宜上５枚を図示して説明する。 In this embodiment, the second extending portion 18b is provided with a protective plate 26 as a conductive plate having conductivity on the side opposite to the side where the positive electrode conductive member 24 is arranged, and the positive electrode conductive member 24, the 1st extension part 18a, the 2nd extension part 18b, and the protection board 26 are welded, respectively. The number of positive electrode tabs 14b is actually about several tens, but five are illustrated and described for convenience.
負極タブ１５ｂも正極タブ１４ｂと同様に構成され、積層された状態で折り曲げられた第１の折り曲げ部と、第１の折り曲げ部の先端側に配置された第２の折り曲げ部と、第１の折り曲げ部と第２の折り曲げ部との間に配置され、かつ電極組立体１２の積層方向に沿って延設された第１の延設部と、第２の折り曲げ部と負極タブ１５ｂの先端との間に配置され、かつ電極組立体１２の積層方向に沿って延設された第２の延設部を有する。そして、第１の延設部と第２の延設部と負極導電部材２５とが重なる状態に配置され、第１の延設部と第２の延設部、及び負極導電部材２５とがそれぞれ接合されている。また、この実施形態では、負極タブ１５ｂの第２の延設部には、負極導電部材２５が配置される側とは反対側に、導電性を有する導電板としての保護板２６が配置され、負極導電部材２５と、第１の延設部と、第２の延設部と、保護板２６とがそれぞれ溶接されている。 The negative electrode tab 15b is also configured in the same manner as the positive electrode tab 14b, and includes a first bent portion that is bent in a stacked state, a second bent portion that is disposed on the distal end side of the first bent portion, and a first bent portion A first extending portion disposed between the bent portion and the second bent portion and extending along the stacking direction of the electrode assembly 12, a second bent portion, and a tip of the negative electrode tab 15b; And a second extending portion that extends along the stacking direction of the electrode assembly 12. And the 1st extension part, the 2nd extension part, and the negative electrode conductive member 25 are arranged in the state where it overlaps, and the 1st extension part, the 2nd extension part, and the negative electrode conductive member 25 are respectively It is joined. Further, in this embodiment, a protective plate 26 as a conductive plate having conductivity is disposed on the second extending portion of the negative electrode tab 15b on the side opposite to the side where the negative electrode conductive member 25 is disposed, The negative electrode conductive member 25, the first extending portion, the second extending portion, and the protective plate 26 are welded to each other.
次に前記の接合構造の形成手順の一例を説明する。
正極タブ１４ｂ、正極導電部材２４及び保護板２６を溶接する場合は、先ず、図４に示すように、正極タブ１４ｂは、全ての正極タブ１４ｂをタブ群の一端側（図４における右端側）に位置する正極タブ１４ｂ側に向かって集められる。正極タブ１４ｂは、同じ長さに形成されているため、各正極タブ１４ｂの先端の位置は一致せずに、先端部が順にずれた状態になる。
Next, an example of the procedure for forming the above-described joint structure will be described.
When welding the positive electrode tab 14b, the positive electrode conductive member 24, and the protective plate 26, first, as shown in FIG. 4, the positive electrode tab 14b has all the positive electrode tabs 14b on one end side of the tab group (the right end side in FIG. 4). Are collected toward the positive electrode tab 14b side. Since the positive electrode tab 14b is formed in the same length, the position of the front-end | tip of each positive electrode tab 14b does not correspond, but the front-end | tip part will be in the state shifted | deviated in order.
次に、正極タブ１４ｂの積層部の基端側に、積層部を折り曲げるための余裕を残した状態で正極導電部材２４を配置し、図示しない治具で正極タブ１４ｂ及び正極導電部材２４を支持する。 Next, the positive electrode conductive member 24 is disposed on the base end side of the laminated portion of the positive electrode tab 14b with a margin for bending the laminated portion, and the positive electrode tab 14b and the positive electrode conductive member 24 are supported by a jig (not shown). To do.
次に、正極導電部材２４から先端部がはみ出している正極タブ１４ｂの先端側を、正極活物質層１４ａ、及び負極活物質層１５ａを有する側に向かって（すなわち、図４の矢印方向に）折り曲げる。そして、図５に示すように、保護板２６を正極タブ１４ｂの積層部に重ねる。その結果、正極導電部材２４から先端部がはみ出していた正極タブ１４ｂは、先端部が保護板２６の内側に位置するように折り曲げられて、全ての正極タブ１４ｂの先端部が正極導電部材２４と保護板２６の間に配置された状態になる。この折り曲げられた部分は、第２の折り曲げ部１７ｂとなる。 Next, the front end side of the positive electrode tab 14b whose front end portion protrudes from the positive electrode conductive member 24 is directed toward the side having the positive electrode active material layer 14a and the negative electrode active material layer 15a (that is, in the direction of the arrow in FIG. 4). Bend it. Then, as shown in FIG. 5, the protection plate 26 is overlaid on the laminated portion of the positive electrode tab 14b. As a result, the positive electrode tab 14 b whose front end portion protrudes from the positive electrode conductive member 24 is bent so that the front end portion is positioned inside the protective plate 26, and the front end portions of all the positive electrode tabs 14 b are connected to the positive electrode conductive member 24. It will be in the state arrange | positioned between the protective plates 26. FIG. This bent portion becomes the second bent portion 17b.
次に、一対の抵抗溶接用電極２８により、正極導電部材２４、正極タブ１４ｂ及び保護板２６を挟持した状態で両抵抗溶接用電極２８間に電圧が印加され、正極導電部材２４、正極タブ１４ｂ及び保護板２６が抵抗溶接により溶接されて、図５に示すように溶接部２７で溶接された状態になる。 Next, a voltage is applied between the resistance welding electrodes 28 with the positive electrode conductive member 24, the positive electrode tab 14b and the protective plate 26 sandwiched between the pair of resistance welding electrodes 28, and the positive electrode conductive member 24 and the positive electrode tab 14b. And the protection board 26 is welded by resistance welding, and it will be in the state welded by the welding part 27, as shown in FIG.
次に正極タブ１４ｂを正極導電部材２４及び保護板２６が電極組立体１２の端面と平行になるように、正極導電部材２４及び保護板２６に挟持されている箇所より基端側において折り曲げると、図３に示す状態になり、正極導電部材２４、正極タブ１４ｂ及び保護板２６の接合構造が完成する。このときに折り曲げられた部分が第１の折り曲げ部１７ａとなる。そのため、正極タブ１４ｂや負極タブ１５ｂを折り曲げる際に、正極導電部材２４や負極導電部材２５を折り曲げる必要がない。また、第１の折り曲げ部１７ａと第２の折り曲げ部１７ｂとの間に配置され、かつ電極組立体１２の積層方向に沿って延設された部分が第１の延設部１８ａとなり、第２の折り曲げ部１７ｂと正極タブ１４ｂの先端との間に配置され、かつ電極組立体１２の積層方向に沿って延設された部分が第２の延設部１８ｂとなる。 Next, when the positive electrode tab 14b is bent on the base end side from the portion sandwiched between the positive electrode conductive member 24 and the protective plate 26 so that the positive electrode conductive member 24 and the protective plate 26 are parallel to the end face of the electrode assembly 12, The state shown in FIG. 3 is obtained, and the joined structure of the positive electrode conductive member 24, the positive electrode tab 14b, and the protective plate 26 is completed. The portion bent at this time becomes the first bent portion 17a. Therefore, it is not necessary to bend the positive electrode conductive member 24 or the negative electrode conductive member 25 when the positive electrode tab 14b or the negative electrode tab 15b is bent. Further, the portion that is disposed between the first bent portion 17a and the second bent portion 17b and that extends along the stacking direction of the electrode assembly 12 becomes the first extended portion 18a, and the second extended portion 18a. The portion extending between the bent portion 17b and the tip of the positive electrode tab 14b and extending along the stacking direction of the electrode assembly 12 becomes the second extending portion 18b.
次に前記のように構成された二次電池１０の作用を説明する。
正極タブ１４ｂは、それぞれ積層された状態で折り曲げられた第１の折り曲げ部１７ａと、第１の折り曲げ部１７ａよりも正極タブ１４ｂの先端側に配置された第２の折り曲げ部１７ｂとを有する。正極タブ１４ｂは、第１の延設部１８ａと、第２の延設部１８ｂと、正極導電部材２４とが重なる状態に配置され、第１の延設部１８ａと第２の延設部１８ｂ、及び正極導電部材２４とがそれぞれ接合されている。したがって、正極導電部材２４との接触面積を十分に確保するために、正極タブ１４ｂの長さを長くした場合でも、正極タブ１４ｂの先端部が正極導電部材２４からはみ出てケース本体１１ａの内面と接触する虞がない。正極タブ１４ｂの長さは、二度折り曲げられた状態において、その先端が電極組立体１２の厚さ方向からはみ出さない長さであればよいため、設計の自由度が高くなる。負極タブ１５ｂも正極タブ１４ｂと同様の構成のため、同様の作用となる。
Next, the operation of the secondary battery 10 configured as described above will be described.
Each of the positive electrode tabs 14b includes a first bent portion 17a that is bent in a stacked state, and a second bent portion 17b that is disposed closer to the distal end side of the positive electrode tab 14b than the first bent portion 17a. The positive electrode tab 14b is disposed in a state where the first extending portion 18a, the second extending portion 18b, and the positive electrode conductive member 24 are overlapped, and the first extending portion 18a and the second extending portion 18b. And the positive electrode conductive member 24 are joined together. Therefore, in order to ensure a sufficient contact area with the positive electrode conductive member 24, even when the length of the positive electrode tab 14b is increased, the tip of the positive electrode tab 14b protrudes from the positive electrode conductive member 24 and the inner surface of the case main body 11a. There is no risk of contact. Since the length of the positive electrode tab 14b may be a length that does not protrude from the thickness direction of the electrode assembly 12 in a state where the positive electrode tab 14b is bent twice, the degree of freedom in design increases. Since the negative electrode tab 15b has the same configuration as the positive electrode tab 14b, the same effect is obtained.
この実施形態によれば、以下に示す効果を得ることができる。
（１）二次電池１０は、端部から突出した形状の正極タブ１４ｂを有する正極１４、及び端部から突出した形状の負極タブ１５ｂを有する負極１５が互いに絶縁された状態で積層された電極組立体１２と、電極組立体１２と電気を授受する正極端子２１及び負極端子２２と、正極タブ１４ｂと正極端子２１とを電気的に接続する正極導電部材２４と、負極タブ１５ｂと負極端子２２とを電気的に接続する負極導電部材２５と、を備える蓄電装置である。そして、正極タブ１４ｂは、積層された状態で折り曲げられた第１の折り曲げ部１７ａと、第１の折り曲げ部１７ａよりも正極タブ１４ｂの先端側に配置された第２の折り曲げ部１７ｂと、第１の折り曲げ部１７ａと第２の折り曲げ部１７ｂとの間に配置され、かつ電極組立体１２の積層方向に沿って延設された第１の延設部１８ａと、第２の折り曲げ部１７ｂと正極タブ１４ｂの先端との間に配置され、かつ電極組立体１２の積層方向に沿って延設された第２の延設部１８ｂとを有する。第１の延設部１８ａと第２の延設部１８ｂと正極導電部材２４とが重なる状態に配置され、第１の延設部１８ａと第２の延設部１８ｂ、及び正極導電部材２４とがそれぞれ接合されている。負極タブ１５ｂも同様の構成である。したがって、電極組立体１２の端面からの正極タブ１４ｂ及び負極タブ１５ｂの突出量を小さくすることができ、正極導電部材２４及び負極導電部材２５の折り曲げ加工を不要にすることができる。また、正極タブ１４ｂ及び負極タブ１５ｂの長さの許容範囲が大きくなり、設計の自由度が高くなる。
According to this embodiment, the following effects can be obtained.
(1) The secondary battery 10 is an electrode in which a positive electrode 14 having a positive electrode tab 14b projecting from an end portion and a negative electrode 15 having a negative electrode tab 15b projecting from an end portion are laminated in an insulated state. The assembly 12, the positive electrode terminal 21 and the negative electrode terminal 22 that exchange electricity with the electrode assembly 12, the positive electrode conductive member 24 that electrically connects the positive electrode tab 14 b and the positive electrode terminal 21, the negative electrode tab 15 b and the negative electrode terminal 22. And a negative electrode conductive member 25 that is electrically connected to each other. The positive electrode tab 14b includes a first bent portion 17a that is bent in a stacked state, a second bent portion 17b that is disposed closer to the distal end side of the positive electrode tab 14b than the first bent portion 17a, A first extending portion 18a disposed between the one bent portion 17a and the second bent portion 17b and extending along the stacking direction of the electrode assembly 12, and a second bent portion 17b. And a second extending portion 18b that is arranged between the positive electrode tab 14b and the electrode assembly 12 in the stacking direction. The first extending portion 18a, the second extending portion 18b, and the positive electrode conductive member 24 are disposed so as to overlap each other, and the first extending portion 18a, the second extending portion 18b, and the positive electrode conductive member 24 are arranged. Are joined to each other. The negative electrode tab 15b has the same configuration. Therefore, the protruding amount of the positive electrode tab 14b and the negative electrode tab 15b from the end face of the electrode assembly 12 can be reduced, and the bending process of the positive electrode conductive member 24 and the negative electrode conductive member 25 can be made unnecessary. Moreover, the tolerance | permissible_range of the length of the positive electrode tab 14b and the negative electrode tab 15b becomes large, and the freedom degree of design becomes high.
（２）複数枚の正極タブ１４ｂ及び負極タブ１５ｂは、正極導電部材２４あるいは負極導電部材２５と、保護板２６に挟まれた状態で正極導電部材２４あるいは負極導電部材２５と保護板２６とに接合されている。したがって、保護板２６を用いずに、複数枚の正極タブ１４ｂ及び負極タブ１５ｂを、正極導電部材２４あるいは、負極導電部材２５と接合する場合に比べて、折り曲げられた状態の複数枚の正極タブ１４ｂ及び負極タブ１５ｂを抵抗溶接用電極２８で挟持することが容易になる。また、正極タブ１４ｂ及び負極タブ１５ｂが抵抗溶接用電極２８に直接押圧されることによって傷つく虞もない。 (2) The plurality of positive electrode tabs 14b and negative electrode tabs 15b are connected to the positive electrode conductive member 24 or the negative electrode conductive member 25 and the protective plate 26 while being sandwiched between the positive electrode conductive member 24 or the negative electrode conductive member 25 and the protective plate 26. It is joined. Therefore, a plurality of positive electrode tabs in a bent state are used as compared with the case where a plurality of positive electrode tabs 14 b and negative electrode tabs 15 b are joined to the positive electrode conductive member 24 or the negative electrode conductive member 25 without using the protective plate 26. 14b and the negative electrode tab 15b can be easily held between the resistance welding electrodes 28. Further, there is no possibility that the positive electrode tab 14b and the negative electrode tab 15b are damaged by being directly pressed against the resistance welding electrode 28.
（３）第２の延設部１８ｂには、正極導電部材２４が配置される側とは反対側に、導電性を有する保護板（導電板）２６が配置され、正極導電部材２４と、第１の延設部１８ａと、第２の延設部１８ｂと、保護板２６とがそれぞれ溶接されている。負極タブ１５ｂも同様に、第２の延設部には、負極導電部材２５が配置される側とは反対側に、導電性を有する保護板（導電板）２６が配置され、負極導電部材２５と、第１の延設部と、第２の延設部と、保護板２６とがそれぞれ溶接されている。したがって、保護板２６を用いずに、複数枚の正極タブ１４ｂ及び負極タブ１５ｂを、正極導電部材２４又は、負極導電部材２５と溶接する場合に比べて、正極タブ１４ｂ及び負極タブ１５ｂが抵抗溶接用電極２８に直接押圧されることによって傷つく虞がない。 (3) In the second extending portion 18b, a protective plate (conductive plate) 26 having conductivity is disposed on the side opposite to the side where the positive electrode conductive member 24 is disposed, and the positive electrode conductive member 24, The first extending portion 18a, the second extending portion 18b, and the protective plate 26 are welded to each other. Similarly, the negative electrode tab 15b is provided with a protective plate (conductive plate) 26 having conductivity on the opposite side to the side where the negative electrode conductive member 25 is arranged in the second extending portion. The first extending portion, the second extending portion, and the protection plate 26 are welded to each other. Therefore, the positive electrode tab 14b and the negative electrode tab 15b are resistance-welded as compared with the case where the plurality of positive electrode tabs 14b and the negative electrode tabs 15b are welded to the positive electrode conductive member 24 or the negative electrode conductive member 25 without using the protective plate 26. There is no fear of being damaged by being directly pressed against the electrode 28 for use.
（４）正極タブ１４ｂの接合構造の場合、正極導電部材２４及び保護板２６は、正極タブ１４ｂと同じ材質であり、負極タブ１５ｂの接合構造の場合、負極導電部材２５及び保護板２６は、負極タブ１５ｂと同じ材質である。したがって、電食が防止される。 (4) In the case of the bonding structure of the positive electrode tab 14b, the positive electrode conductive member 24 and the protective plate 26 are the same material as the positive electrode tab 14b. In the case of the bonding structure of the negative electrode tab 15b, the negative electrode conductive member 25 and the protective plate 26 are It is the same material as the negative electrode tab 15b. Therefore, electrolytic corrosion is prevented.
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。
○ 正極タブ１４ｂ及び負極タブ１５ｂの第２の折り曲げ部１７ｂより先端側の第２の延設部１８ｂは、必ずしも全ての正極タブ１４ｂ及び負極タブ１５ｂにおいて、正極導電部材２４あるいは負極導電部材２５や保護板２６に溶接される必要はない。例えば、図６に示すように、正極タブ１４ｂ及び負極タブ１５ｂは、電極組立体１２の厚さ方向において最も外側になるいずれか一方の正極タブ１４ｂ及び負極タブ１５ｂが、他の正極タブ１４ｂ及び他の負極タブ１５ｂの第２の折り曲げ部１７ｂより先端側を覆う状態で、正極導電部材２４あるいは負極導電部材２５に溶接されていてもよい。この構成によれば、正極タブ１４ｂ及び負極タブ１５ｂが溶接される際に、重ねられた状態の正極タブ１４ｂ及び負極タブ１５ｂの枚数が少なくなり、溶接に必要なエネルギーが少なくなる。なお、図６は正極タブ１４ｂが正極導電部材２４及び保護板２６に溶接されている状態を示す。
The embodiment is not limited to the above, and may be embodied as follows, for example.
The second extending portion 18b on the front end side of the second bent portion 17b of the positive electrode tab 14b and the negative electrode tab 15b is not necessarily in the positive electrode conductive member 24 or the negative electrode conductive member 25 in all the positive electrode tabs 14b and the negative electrode tabs 15b. It is not necessary to be welded to the protection plate 26. For example, as shown in FIG. 6, the positive electrode tab 14 b and the negative electrode tab 15 b are either one of the positive electrode tab 14 b and the negative electrode tab 15 b that are on the outermost side in the thickness direction of the electrode assembly 12, and the other positive electrode tab 14 b and You may weld to the positive electrode conductive member 24 or the negative electrode conductive member 25 in the state which covers the front end side from the 2nd bending part 17b of the other negative electrode tab 15b. According to this configuration, when the positive electrode tab 14b and the negative electrode tab 15b are welded, the number of the stacked positive electrode tabs 14b and negative electrode tabs 15b is reduced, and energy required for welding is reduced. FIG. 6 shows a state in which the positive electrode tab 14 b is welded to the positive electrode conductive member 24 and the protection plate 26.
○ 正極タブ１４ｂ及び負極タブ１５ｂのうち、外側の数枚の正極タブ１４ｂ及び負極タブ１５ｂが、他の正極タブ１４ｂ及び他の負極タブ１５ｂの第２の折り曲げ部１７ｂより先端側を覆う状態で、正極導電部材２４あるいは負極導電部材２５に溶接されていてもよい。この場合も、正極タブ１４ｂ及び負極タブ１５ｂが溶接される際に、重ねられた状態の正極タブ１４ｂ及び負極タブ１５ｂの枚数が少なくなり、溶接に必要なエネルギーが少なくなる。 ○ Out of the positive electrode tab 14b and the negative electrode tab 15b, the outer few positive electrode tabs 14b and the negative electrode tabs 15b cover the tip side from the second bent portions 17b of the other positive electrode tabs 14b and the other negative electrode tabs 15b. The positive electrode conductive member 24 or the negative electrode conductive member 25 may be welded. Also in this case, when the positive electrode tab 14b and the negative electrode tab 15b are welded, the number of stacked positive electrode tabs 14b and negative electrode tabs 15b is reduced, and energy required for welding is reduced.
○ 正極タブ１４ｂ及び負極タブ１５ｂは、正極導電部材２４あるいは負極導電部材２５に溶接される第２の折り曲げ部１７ｂより先端側の部分の枚数を少なくするため、各正極タブ１４ｂ及び各負極タブ１５ｂの長さが異なる構成としたり、正極タブ１４ｂ及び負極タブ１５ｂを複数のグループに分けて、グループ毎に異なる長さとしたりしてもよい。 The positive electrode tab 14b and the negative electrode tab 15b are formed so that the positive electrode tabs 14b and the negative electrode tabs 15b are formed in order to reduce the number of portions on the tip side from the second bent portion 17b welded to the positive electrode conductive member 24 or the negative electrode conductive member 25. Alternatively, the positive electrode tab 14b and the negative electrode tab 15b may be divided into a plurality of groups, and may have different lengths for each group.
○ 保護板２６は必須ではなく、保護板２６を設けずに、複数の正極タブ１４ｂ及び負極タブ１５ｂが正極導電部材２４あるいは負極導電部材２５に溶接された構成であってもよい。しかし、保護板２６を設ける方が、正極タブ１４ｂ及び負極タブ１５ｂと正極導電部材２４あるいは負極導電部材２５とを溶接する際に、溶接作業が容易になる。 The protective plate 26 is not essential, and a configuration in which a plurality of positive electrode tabs 14 b and negative electrode tabs 15 b are welded to the positive electrode conductive member 24 or the negative electrode conductive member 25 without providing the protective plate 26 may be used. However, when the protective plate 26 is provided, the welding operation is facilitated when the positive electrode tab 14 b and the negative electrode tab 15 b are welded to the positive electrode conductive member 24 or the negative electrode conductive member 25.
○ 正極タブ１４ｂあるいは負極タブ１５ｂと溶接される正極導電部材２４あるいは負極導電部材２５及び保護板２６は、正極タブ１４ｂあるいは負極タブ１５ｂと異なる材質であってもよい。 The positive electrode conductive member 24 or the negative electrode conductive member 25 and the protection plate 26 to be welded to the positive electrode tab 14b or the negative electrode tab 15b may be made of a material different from that of the positive electrode tab 14b or the negative electrode tab 15b.
○ 電極組立体１２は積層型の電極組立体に限らず、帯状の正極及び負極がセパレータを間に挟んだ積層状態で巻回された巻回型の電極組立体であってもよい。
○ 正極タブ１４ｂあるいは負極タブ１５ｂと、正極導電部材２４あるいは負極導電部材２５及び保護板との溶接は、抵抗溶接に限らず、他の溶接方法、例えば、超音波溶接であってもよい。
The electrode assembly 12 is not limited to a stacked electrode assembly, and may be a wound electrode assembly in which a belt-like positive electrode and a negative electrode are wound in a stacked state with a separator interposed therebetween.
The welding of the positive electrode tab 14b or the negative electrode tab 15b, the positive electrode conductive member 24 or the negative electrode conductive member 25, and the protective plate is not limited to resistance welding, but may be other welding methods such as ultrasonic welding.
○ 電極、即ち正極１４及び負極１５は、金属箔１３の少なくとも片面に活物質層を有していればよく、両面ではなく片面に活物質層を有する構成であってもよい。
○ 正極タブ１４ｂあるいは負極タブ１５ｂを金属箔１３の一部を突設して形成する代わりに、金属箔１３にタブとなる金属箔を溶接して形成してもよい。
The electrode, that is, the positive electrode 14 and the negative electrode 15 only need to have an active material layer on at least one side of the metal foil 13, and may have a configuration having an active material layer on one side instead of both sides.
O Instead of forming the positive electrode tab 14b or the negative electrode tab 15b by projecting a part of the metal foil 13, the metal foil 13 may be formed by welding a metal foil serving as a tab.
○ 積層型の電極組立体１２において、正極１４及び負極１５の間にセパレータ１６が存在する構成として、シート状のセパレータ１６を使用せずに、例えば、正極１４及び負極１５の一方を袋状のセパレータに収容して、そのセパレータと袋状のセパレータに収容されていない電極とを交互に積層してもよい。 ○ In the stacked electrode assembly 12, the separator 16 exists between the positive electrode 14 and the negative electrode 15. For example, one of the positive electrode 14 and the negative electrode 15 is formed in a bag shape without using the sheet-like separator 16. The separators and the electrodes that are not accommodated in the bag-shaped separator may be alternately stacked.
○ 二次電池１０は電解液が必須ではなく、例えば、セパレータ１６が高分子電解質で形成されていてもよい。
○ 二次電池１０は、リチウムイオン二次電池に限らず、ニッケル水素二次電池やニッケルカドミウム二次電池、マグネシウム二次電池等の他の二次電池であってもよい。
The secondary battery 10 does not require an electrolytic solution, and for example, the separator 16 may be formed of a polymer electrolyte.
The secondary battery 10 is not limited to a lithium ion secondary battery, and may be another secondary battery such as a nickel hydride secondary battery, a nickel cadmium secondary battery, or a magnesium secondary battery.
○ 蓄電装置は、二次電池１０に限らず、例えば、電気二重層キャパシタやリチウムイオンキャパシタ等のようなキャパシタであってもよい。
以下の技術的思想（発明）は前記実施形態から把握できる。
The power storage device is not limited to the secondary battery 10 and may be a capacitor such as an electric double layer capacitor or a lithium ion capacitor.
The following technical idea (invention) can be understood from the embodiment.
（１）請求項１に記載の発明において、複数枚の前記正極タブ及び前記負極タブは、前記正極導電部材あるいは負極導電部材及び保護板に挟まれた状態で前記正極導電部材あるいは負極導電部材及び前記保護板に溶接されている。 (1) In the invention according to claim 1, a plurality of the positive electrode tabs and the negative electrode tabs are sandwiched between the positive electrode conductive member or the negative electrode conductive member and a protective plate, and the positive electrode conductive member or the negative electrode conductive member and It is welded to the protective plate.
１０…蓄電装置としての二次電池、１２…電極組立体、１４…正極、１４ｂ…正極タブ、１５…負極、１５ｂ…負極タブ、１７ａ…第１の折り曲げ部、１７ｂ…第２の折り曲げ部、１８ａ…第１の延設部、１８ｂ…第２の延設部、２１…正極端子、２２…負極端子、２４…正極導電部材、２５…負極導電部材。 DESCRIPTION OF SYMBOLS 10 ... Secondary battery as an electrical storage device, 12 ... Electrode assembly, 14 ... Positive electrode, 14b ... Positive electrode tab, 15 ... Negative electrode, 15b ... Negative electrode tab, 17a ... 1st bending part, 17b ... 2nd bending part, 18a ... 1st extension part, 18b ... 2nd extension part, 21 ... Positive electrode terminal, 22 ... Negative electrode terminal, 24 ... Positive electrode conductive member, 25 ... Negative electrode conductive member.
Claims (3)
前記電極組立体と電気を授受する正極端子及び負極端子と、
前記正極タブと前記正極端子とを電気的に接続する正極導電部材と、
前記負極タブと前記負極端子とを電気的に接続する負極導電部材と、を備える蓄電装置であって、
前記正極タブ及び前記負極タブは、
それぞれ積層された状態で折り曲げられた第１の折り曲げ部と、
前記第１の折り曲げ部よりも前記正極タブ又は前記負極タブの先端側に配置された第２の折り曲げ部と、
前記第１の折り曲げ部と前記第２の折り曲げ部との間に配置され、かつ前記電極組立体の積層方向に沿って延設された第１の延設部と、
前記第２の折り曲げ部と前記正極タブの先端又は前記負極タブの先端との間に配置され、かつ前記電極組立体の積層方向に沿って延設された第２の延設部とを有し、
前記第１の延設部と前記第２の延設部と前記正極導電部材又は前記負極導電部材とが重なる状態に配置され、
前記第１の延設部と前記第２の延設部、及び前記正極導電部材又は前記負極導電部材とがそれぞれ接合されていることを特徴とする蓄電装置。 An electrode assembly in which a positive electrode having a positive electrode tab protruding from an end and a negative electrode having a negative electrode tab protruding from an end are laminated in a state of being insulated from each other;
A positive electrode terminal and a negative electrode terminal for transferring electricity to and from the electrode assembly;
A positive electrode conductive member for electrically connecting the positive electrode tab and the positive electrode terminal;
A negative electrode conductive member that electrically connects the negative electrode tab and the negative electrode terminal;
The positive electrode tab and the negative electrode tab are:
A first bent portion that is bent in a stacked state;
A second bent portion disposed closer to the tip side of the positive electrode tab or the negative electrode tab than the first bent portion;
A first extending portion disposed between the first bent portion and the second bent portion and extending along the stacking direction of the electrode assembly;
A second extending portion disposed between the second bent portion and the tip of the positive electrode tab or the tip of the negative electrode tab and extending along the stacking direction of the electrode assembly; ,
The first extending portion, the second extending portion, and the positive electrode conductive member or the negative electrode conductive member are arranged to overlap each other,
The power storage device, wherein the first extension part, the second extension part, and the positive electrode conductive member or the negative electrode conductive member are joined to each other.
前記正極導電部材又は前記負極導電部材と、前記第１の延設部と、前記第２の延設部と、前記導電板とがそれぞれ溶接されている請求項１又は請求項２に記載の蓄電装置。 In the second extending portion, a conductive plate having conductivity is arranged on the side opposite to the side where the positive electrode conductive member or the negative electrode conductive member is arranged,
The electrical storage according to claim 1 or 2, wherein the positive electrode conductive member or the negative electrode conductive member, the first extending portion, the second extending portion, and the conductive plate are welded to each other. apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014134930A JP6274034B2 (en) | 2014-06-30 | 2014-06-30 | Power storage device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014134930A JP6274034B2 (en) | 2014-06-30 | 2014-06-30 | Power storage device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2016012542A true JP2016012542A (en) | 2016-01-21 |
| JP6274034B2 JP6274034B2 (en) | 2018-02-07 |
Family
ID=55229108
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2014134930A Active JP6274034B2 (en) | 2014-06-30 | 2014-06-30 | Power storage device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP6274034B2 (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019026672A1 (en) * | 2017-08-03 | 2019-02-07 | エリーパワー株式会社 | Sealed battery, battery pack, and method for manufacturing sealed battery |
| JP2019040720A (en) * | 2017-08-24 | 2019-03-14 | 株式会社村田製作所 | Power storage device and manufacturing method thereof |
| KR20190067612A (en) * | 2017-12-07 | 2019-06-17 | 주식회사 엘지화학 | Electrode, method for manufacturing the same, electrode assembly and secondary battery |
| WO2019139220A1 (en) * | 2018-01-09 | 2019-07-18 | 삼성에스디아이(주) | Secondary battery and manufacturing method therefor |
| JP2020047708A (en) * | 2018-09-18 | 2020-03-26 | 太陽誘電株式会社 | Electrochemical device, conjugant, method for manufacturing electrochemical device and method for manufacturing conjugant |
| US20210376431A1 (en) * | 2017-10-17 | 2021-12-02 | Robert Bosch Gmbh | Energy storage device |
| CN114865239A (en) * | 2022-04-18 | 2022-08-05 | 远景动力技术(江苏)有限公司 | Battery assembling method and assembling tool for battery |
| WO2023168545A1 (en) * | 2022-03-07 | 2023-09-14 | 宁德新能源科技有限公司 | Insulating sheet, battery cell, battery and electronic device |
| JP7436116B2 (en) | 2020-01-15 | 2024-02-21 | エルジー エナジー ソリューション リミテッド | Electrode tab bending device and method |
| KR102659830B1 (en) * | 2018-01-09 | 2024-04-23 | 삼성에스디아이 주식회사 | Secondary battery And Fabricating Method Thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013161757A (en) * | 2012-02-08 | 2013-08-19 | Toyota Industries Corp | Power storage device and vehicle |
| WO2014034413A1 (en) * | 2012-08-28 | 2014-03-06 | 株式会社 豊田自動織機 | Electricity storage device |
| JP2014044903A (en) * | 2012-08-28 | 2014-03-13 | Toyota Industries Corp | Power storage device and manufacturing method of electrode assembly |
-
2014
- 2014-06-30 JP JP2014134930A patent/JP6274034B2/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013161757A (en) * | 2012-02-08 | 2013-08-19 | Toyota Industries Corp | Power storage device and vehicle |
| WO2014034413A1 (en) * | 2012-08-28 | 2014-03-06 | 株式会社 豊田自動織機 | Electricity storage device |
| JP2014044903A (en) * | 2012-08-28 | 2014-03-13 | Toyota Industries Corp | Power storage device and manufacturing method of electrode assembly |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPWO2019026672A1 (en) * | 2017-08-03 | 2020-11-05 | エリーパワー株式会社 | Manufacturing method of sealed batteries, assembled batteries and sealed batteries |
| WO2019026672A1 (en) * | 2017-08-03 | 2019-02-07 | エリーパワー株式会社 | Sealed battery, battery pack, and method for manufacturing sealed battery |
| JP7108319B2 (en) | 2017-08-03 | 2022-07-28 | エリーパワー株式会社 | SEALED BATTERY, BATTERY ASSEMBLY, AND METHOD FOR MANUFACTURING SEALED BATTERY |
| JP2019040720A (en) * | 2017-08-24 | 2019-03-14 | 株式会社村田製作所 | Power storage device and manufacturing method thereof |
| US20210376431A1 (en) * | 2017-10-17 | 2021-12-02 | Robert Bosch Gmbh | Energy storage device |
| US11456445B2 (en) | 2017-12-07 | 2022-09-27 | Lg Energy Solution, Ltd. | Electrode, method for manufacturing the same, electrode assembly, and secondary battery |
| KR20190067612A (en) * | 2017-12-07 | 2019-06-17 | 주식회사 엘지화학 | Electrode, method for manufacturing the same, electrode assembly and secondary battery |
| KR102270867B1 (en) * | 2017-12-07 | 2021-07-01 | 주식회사 엘지에너지솔루션 | Electrode, method for manufacturing the same, electrode assembly and secondary battery |
| WO2019139220A1 (en) * | 2018-01-09 | 2019-07-18 | 삼성에스디아이(주) | Secondary battery and manufacturing method therefor |
| KR102659830B1 (en) * | 2018-01-09 | 2024-04-23 | 삼성에스디아이 주식회사 | Secondary battery And Fabricating Method Thereof |
| JP7044676B2 (en) | 2018-09-18 | 2022-03-30 | 太陽誘電株式会社 | Electrochemical devices and methods for manufacturing electrochemical devices |
| JP2020047708A (en) * | 2018-09-18 | 2020-03-26 | 太陽誘電株式会社 | Electrochemical device, conjugant, method for manufacturing electrochemical device and method for manufacturing conjugant |
| JP7436116B2 (en) | 2020-01-15 | 2024-02-21 | エルジー エナジー ソリューション リミテッド | Electrode tab bending device and method |
| WO2023168545A1 (en) * | 2022-03-07 | 2023-09-14 | 宁德新能源科技有限公司 | Insulating sheet, battery cell, battery and electronic device |
| CN114865239A (en) * | 2022-04-18 | 2022-08-05 | 远景动力技术(江苏)有限公司 | Battery assembling method and assembling tool for battery |
| CN114865239B (en) * | 2022-04-18 | 2024-04-09 | 远景动力技术(江苏)有限公司 | Battery assembling method and battery assembling tool |
Also Published As
| Publication number | Publication date |
|---|---|
| JP6274034B2 (en) | 2018-02-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6274034B2 (en) | Power storage device | |
| EP2284930B1 (en) | Secondary battery | |
| JP6065010B2 (en) | Power storage device | |
| JP5214692B2 (en) | battery | |
| JP6967413B2 (en) | Power storage device and manufacturing method of power storage device | |
| JP6032077B2 (en) | Power storage device | |
| JP6414731B2 (en) | Power storage element and power storage device | |
| JP6274013B2 (en) | Power storage device | |
| JP2018200841A (en) | Manufacturing method of power storage device, and power storage device | |
| JP2018107030A (en) | Power storage device and manufacturing method of power storage device | |
| JP6103204B2 (en) | Method for manufacturing power storage device | |
| JP6274011B2 (en) | Power storage device | |
| JP2018006113A (en) | Power storage device and manufacturing method for power storage device | |
| JP6287563B2 (en) | Power storage device | |
| JP2015106535A (en) | Power storage device and manufacturing method of the same | |
| JP2017004845A (en) | Manufacturing method of power storage device | |
| JP2019121433A (en) | Power storage device | |
| JP6314658B2 (en) | Power storage device | |
| JP5586722B2 (en) | Battery and ultrasonic bonding method of battery | |
| JP6394867B2 (en) | Power storage device | |
| JP6107607B2 (en) | Power storage device | |
| JP2014022153A (en) | Electricity storage device | |
| JP2017216119A (en) | Power storage device | |
| JP2018018704A (en) | Power storage device | |
| JP2014072134A (en) | Method for manufacturing power storage device, and power storage device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20170302 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20171129 |
|
| 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: 20171212 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20171225 |
|
| R151 | Written notification of patent or utility model registration |
Ref document number: 6274034 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R151 |