JP3912574B2 - Sealed battery - Google Patents

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JP3912574B2
JP3912574B2 JP2000367879A JP2000367879A JP3912574B2 JP 3912574 B2 JP3912574 B2 JP 3912574B2 JP 2000367879 A JP2000367879 A JP 2000367879A JP 2000367879 A JP2000367879 A JP 2000367879A JP 3912574 B2 JP3912574 B2 JP 3912574B2
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positive electrode
negative electrode
current collector
collector plate
positive
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JP2002170547A (en
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一弥 岡部
勝彦 岡本
賢治 近末
宏 油布
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株式会社ユアサ開発
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Description

【０００１】
【発明の属する技術分野】
本発明は密閉形電池に係り、特にセパレータを介して負極および正極を積層させた発電要素を有し、この発電要素の一方の側面に負極集電板を接続するとともに他方の側面に正極集電板を接続した密閉形電池に関する。
【０００２】
【従来の技術】
図８に示すニッケル・水素電池やリチウムイオン電池80は、セパレータ82を介して負極84および正極86が積層された発電要素88と、負極集電板90および正極集電板92とを有し、発電要素 88 は、負極 84 の縁部が突出した負極突出部と正極 86 の縁部が突出した正極突出部とを備え、集電板90，92が、負極集電板90および正極集電板92の各表面90Ａ，92Ａ（92Ａは図９参照）にレーザ光若しくは電子線95を照射するレーザ溶接若しくは電子ビーム溶接により負極84および正極86に接続され、この状態で略箱状の密閉形電池用パッケージ98に収容されている。以下、図９で正極86に正極集電板92を接続する例について説明する。
【０００３】
図９に示すように、発電要素88を構成する正極86に正極集電板92を載置し、正極集電板92の上方からレーザ光95を照射することにより、レーザ光95のエネルギ熱で正極86の縁部が突出した正極突出部86Ａの端部および正極集電板92を熱融着する。これにより、正極86の正極突出部の端部に正極集電板92を溶接部93で接続できる。なお、負極84の場合も正極86と同様に、負極84の負極突出部の端部が負極集電板90にレーザ溶接されている。
【０００４】
【発明が解決しようとする課題】
ところで、ニッケル・水素電池80の品質を維持するためには、負極84および正極86にそれぞれ負極集電板90および正極集電板92を確実に接続することが重要である。このため、負極84と負極集電板90との接続性をより高いものにするとともに、正極86と正極集電板92との接続性をより高いものにすることが望まれている。
【０００５】
加えて、ニッケル・水素電池80の生産性を高めるためには、負極84および正極86にそれぞれ負極集電板90および正極集電板92を容易に接続できることが重要である。このため、負極84と負極集電板90との接続作業をより簡単にするとともに、正極86と正極集電板92との接続作業をより簡単にすることが望まれている。
【０００６】
本発明は、前述した問題点に鑑みてなされたものであり、その目的は、負極および正極に負極集電板および正極集電板をより確実に接続でき、かつ負極および正極に負極集電板および正極集電板をより簡単に接続できる密閉形電池を提供することにある。
【０００７】
【課題を解決するための手段】
本発明においては、請求項１に記載したように、セパレータを介して負極および正極を具備した発電要素と一対の集電板とを備え、前記負極の縁部が前記発電要素から突出した負極突出部と前記正極の縁部が前記発電要素から突出した正極突出部とを備え、前記集電板の一方は、当該集電板の表面にレーザ光を照射するレーザ溶接若しくは電子線を照射する電子ビーム溶接により前記負極突出部の端部に接続され、前記集電板の他方は、当該集電板の表面にレーザ光を照射するレーザ溶接若しくは電子線を照射する電子ビーム溶接により前記正極突出部の端部に接続された密閉形電池であって、前記負極突出部および前記正極突出部のうちの少なくとも一方は、屈伸部を備えていることを特徴とする密閉形電池。
【０００８】
前記負極突出部および前記正極突出部のうちの少なくとも一方に屈伸部を有し、負極および正極のうちの一方が集電板に対して弾性接触している。このため、万一負極や正極のなかに長さの短いものが含まれていても、全ての負極や正極を集電板に確実に当接できる。加えて、万一負極や正極のなかに長さの短いものが含まれていても、全ての負極や正極を集電板に簡単に当接できる。
【０００９】
また、本発明においては、請求項２に記載したように、前記屈伸部が前記負極突出部の端部または前記正極突出部の端部に設けられていることを特徴としている。
【００１０】
屈伸部が負極突出部の端部または正極突出部の端部に設けられている。このため、屈伸部が集電板に対して面接触する。よってレーザ溶接若しくは電子ビーム溶接する際に、負極および正極の屈伸部を集電板に線溶接できる。従って、負極および正極の集電板に対する接続強度が向上する。また、負極および正極のうちの一方が集電板に対して弾性接触する。このため、万一負極や正極のなかに長さの短いものが含まれていても、全ての負極や正極を集電板に確実に当接できる。加えて、万一負極や正極のなかに長さの短いものが含まれていても、全ての負極や正極を集電板に簡単に当接できる。
【００１１】
【発明の実施の形態】
以下、本発明に係る実施形態を図面に基づいて詳細に説明する。なお、以下に説明する各実施形態において、既に図１において説明した部材等については、図中に同一符号あるいは相当符号を付すことにより説明を簡略化あるいは省略する。
【００１２】
参考例を図１に示す。図１に示すように、参考例のニッケル・水素電池やリチウムイオン電池10は、セパレータ12（図２も参照）を介して負極14および正極16を具備した発電要素18と、負極集電板20および正極集電板22とを有し、発電要素 18 は、負極 14 の縁部が突出した負極突出部と正極 16 の縁部が突出した正極突出部とを備え、集電板20，22が、負極集電板20および正極集電板22の各表面20Ａ，22Ａ（22Ａは図２参照）にレーザ光若しくは電子線25（図３参照）を照射するレーザ溶接若しくは電子ビーム溶接により負極14および正極16に接続され、この状態で略箱状の密閉形電池用パッケージ28に収容された密閉形電池である。
【００１３】
加えて、ニッケル・水素電池やリチウムイオン電池10は、負極14の前記負極突出部および前記正極16の前記正極突出部に設けられた屈曲部15，17を有し、これらの屈曲部15，17が負極集電板20及び正極集電板22に対して面接触している。
【００１４】
発電要素18は、図２に示すように負極14の前記負極突出部が正極16の左側辺16Ａから左側に突出され、左側辺14Ａに屈曲部15が設けられ、正極16の前記正極突出部が負極14の右側辺14Ｂから右側に突出され、右側辺14Ｂに屈曲部17が設けられている。
【００１５】
図２に示すように、それぞれの屈曲部15は、全て同じ方向を向いて折り曲げられている。よって、隣接する負極14の隙間を広げることなく屈曲部15を折り曲げることが可能になる。また、それぞれの屈曲部17も、全て同じ方向を向いて折り曲げられている。よって、隣接する正極16の隙間を広げることなく屈曲部17を折り曲げることが可能になる。このため、発電要素18の容積効率を低下させないようにできる。
【００１６】
負極集電板20は、負極14の屈曲部15に矢印のように当てた後、レーザ溶接若しくは電子ビーム溶接で接続される。これにより、負極集電板20は発電要素18の左側に取り付けられる。正極集電板22は、正極16の屈曲部17にレーザ溶接若しくは電子ビーム溶接で接続されている。これにより、発電要素18の右側に取り付けられる。なお、図３に示す符号30は溶接部を示す。
【００１７】
図１に示す密閉形電池用パッケージ28は、負極集電板20および正極集電板22を取り付けた発電要素18を収容する開口29を上端に備える。負極集電板20および負極集電板22を取り付けた発電要素18を、開口29から密閉形電池用パッケージ28に収容し、開口29を閉じることでニッケル・水素電池やリチウムイオン電池10が製造される。
【００１８】
つぎに、図３に基づいて発電要素18の正極16に正極集電板22をレーザ溶接若しくは電子ビーム溶接する例について説明する。なお、負極14に負極集電板20をレーザ溶接若しくは電子ビーム溶接する工程は正極16に正極集電板22をレーザ溶接若しくは電子ビーム溶接する工程と同じなので説明を省略する。
【００１９】
まず、セパレータ12を介して負極14および正極16が積層された発電要素18を用意する。つぎに、正極集電板22を発電要素18の屈曲部17に載せる。ついで、正極集電板22の表面22Ａ側からレーザ光若しくは電子線25を照射する。
【００２０】
正極16に屈曲部17を有し、屈曲部17が正極集電板22に対して面接触している。よってレーザ溶接若しくは電子ビーム溶接する際に、正極16の屈曲部17を正極集電板22に線溶接できる。従って、正極集電板22に対する正極16の接続強度が向上する。加えて、屈曲部17を正極集電板22に対して面接触させることで、正極17に正極集電板22を容易に接続できる。
【００２１】
つぎに、本発明の第１実施形態〜第３実施形態について図４、図６および図７に基づいて説明する。図４に示すように、本発明に係る第１実施形態であるニッケル・水素電池やリチウムイオン電池40は、セパレータ12を介して負極42および正極44が積層された発電要素45と、負極集電板20および正極集電板22とを有し、負極 42 の縁部が発電要素 45 から突出した負極突出部 42 Ａと正極 44 の縁部が発電要素 45 から突出した正極突出部 44 Ｂとを備え、集電板20，22が、負極集電板20および正極集電板22の各表面20Ａ，22Ａにレーザ光若しくは電子線25を照射するレーザ溶接若しくは電子ビーム溶接により負極42および正極44に接続され、この状態で略箱状の密閉形電池用パッケージ28（図１参照）に収容された密閉形電池である。
【００２２】
このニッケル・水素電池やリチウムイオン電池40は、前記負極突出および前記正極突出部のうち少なくとも一方が、屈伸部46，48を有し、負極42および正極44のうちの一方が負極集電板20及び正極集電板22に対して弾性接触している。
【００２３】
このため、万一負極42や正極44のなかに長さの短いものが含まれていても、全ての負極42や正極44を負極集電板20および正極集電板22に確実に当接できる。従って、負極42や正極44を負極集電板20および正極集電板22にレーザ溶接若しくは電子ビーム溶接で確実に接続でき、さらに溶接作業を手間をかけないで簡単に行える。
【００２４】
加えて、ニッケル・水素電池やリチウムイオン電池40は、屈伸部46，48が負極42の負極突出部の端部および正極44の正極突出部の端部に設けられている。よって、屈伸部46は負極集電板20に面接触し、屈伸部48は正極集電板22に面接触する。このため、レーザ溶接若しくは電子ビーム溶接する際に、負極20および正極22の屈伸部46，48を負極集電板20および正極集電板22に線溶接できる。従って、負極集電板20及び正極集電板22に対する負極42および正極44の接続強度が向上し、さらに溶接作業を手間をかけないで簡単に行える。
【００２５】
図６に示すように、本発明に係る第２実施形態であるニッケル・水素電池やリチウムイオン電池60は、負極62の縁部が発電要素から突出した負極突出部 62 Ａおよび正極64の縁部が発電要素から突出した正極突出部 64 Ｂに屈伸部 60，68を有し、負極62および正極64のうちの一方が負極集電板20及び正極集電板22に対して弾性接触している。
【００２６】
このため、万一負極62や正極64のなかに長さの短いものが含まれていても、全ての負極62や正極64を負極集電板20及び正極集電板22に確実に当接できる。従って、負極62や正極64を負極集電板20及び正極集電板22にレーザ溶接若しくは電子ビーム溶接で確実に接続でき、さらに溶接作業を手間をかけないで簡単に行える。
【００２７】
図７に示すように、本発明に係る第３実施形態であるニッケル・水素電池やリチウムイオン電池70は、負極72の縁部が発電要素から突出した負極突出部 72 Ａおよび正極74の縁部が発電要素から突出した正極突出部 74 Ｂに屈伸部76，78を有し、負極72および正極74のうちの一方が負極集電板20及び正極集電板22に対して弾性接触している。
【００２８】
このため、万一負極72や正極74のなかに長さの短いものが含まれていても、全ての負極72や正極74を負極集電板20及び正極集電板22に確実に当接できる。従って、負極72や正極74を負極集電板20及び正極集電板22にレーザ溶接若しくは電子ビーム溶接で確実に接続でき、さらに溶接作業を手間をかけないで簡単に行える。
【００２９】
なお、本発明の密閉形電池は、前述した各実施形態に限定されるものではなく、適宜な変形、改良等が可能である。例えば、本発明は、密閉形電池としてニッケル・水素電池やリチウムイオン電池を例に説明したが、これに限定されるものではなく、その他の密閉形電池に適用することも可能である。
【００３０】
その他、前述した各実施形態において例示した負極，正極，発電要素，集電板，屈曲部，屈伸部等の材質，形状，寸法，形態，数，配置個所，厚さ寸法等は本発明を達成できるものであれば任意であり、限定されない。
【００３１】
【発明の効果】
本発明においては、請求項１に記載したように、負極の縁部が発電要素から突出した負極突出部および前記正極の縁部が発電要素から突出した正極突出部のうちの少なくとも一方に屈伸部を有し、負極および正極のうちの一方が集電板に対して弾性接触している。このため、万一負極や正極のなかに長さの短いものが含まれていても、全ての負極や正極を集電板に確実に当接できる。従って、負極や正極を集電板にレーザ溶接若しくは電子ビーム溶接で確実に接続できる。
【００３２】
加えて、万一負極や正極のなかに長さの短いものが含まれていても、全ての負極や正極を集電板に簡単に当接できるので、レーザ溶接作業を手間をかけないで簡単に行える。
【００３３】
本発明においては、請求項２に記載したように、屈伸部が前記負極突出部の端部および前記正極突出部の端部のうちの一方に設けられている。このため、屈伸部が集電板に対して面接触する。よってレーザ溶接若しくは電子ビーム溶接する際に、負極および正極の屈伸部を集電板に線溶接できる。従って、集電板に対する負極および正極の集電板に対する接続強度が向上する。
【００３４】
さらに、負極および正極のうちの一方が集電板に対して弾性接触する。このため、万一負極や正極のなかに長さの短いものが含まれていても、全ての負極や正極を集電板に確実に当接できる。従って、負極や正極を集電板にレーザ溶接若しくは電子ビーム溶接で確実に接続できる。加えて、万一負極や正極のなかに長さの短いものが含まれていても、全ての負極や正極を集電板に簡単に当接できるので、溶接作業を手間をかけないで簡単に行える。
【図面の簡単な説明】
【図１】参考例の密閉形電池を示す分解斜視図である。
【図２】図１のＡ−Ａ線断面図である。
【図３】参考例の密閉形電池の作用説明である。
【図４】本発明に係る密閉形電池の断面図である。
【図５】参考例の密閉形電池の断面図である。
【図６】本発明に係る密閉形電池の断面図である。
【図７】本発明に係る密閉形電池の断面図である。
【図８】従来の密閉形電池を示す分解斜視図である。
【図９】図８のＢ−Ｂ線断面図である。
【符号の説明】
10，40，50，60，70 密閉形電池（ニッケル・水素電池）
12 セパレータ
14，42，52，62，72 負極
14Ａ，42Ａ，52Ａ，62Ａ，72Ａ 負極突出部
15，17 屈曲部
16，44，54，64，74 正極
16Ｂ，44Ｂ，54Ｂ，64Ｂ，74Ｂ 正極突出部
18，45 発電要素
20 集電板（負極集電板）
20Ａ 負極集電板の表面
22 集電板（正極集電板）
22Ａ 正極集電板の表面
25 レーザ光
46，48 ， 66，68，76，78 屈伸部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sealed battery, and in particular, has a power generation element in which a negative electrode and a positive electrode are stacked via a separator, and a negative electrode current collector plate is connected to one side surface of the power generation element and a positive electrode current collector is connected to the other side surface. The present invention relates to a sealed battery to which plates are connected.
[0002]
[Prior art]
A nickel / hydrogen battery or a lithium ion battery 80 shown in FIG. 8 has a power generation element 88 in which a negative electrode 84 and a positive electrode 86 are laminated via a separator 82, and a negative electrode current collector plate 90 and a positive electrode current collector plate 92. The power generation element 88 includes a negative electrode protruding portion from which the edge of the negative electrode 84 protrudes and a positive electrode protruding portion from which the edge of the positive electrode 86 protrudes , and the current collector plates 90 and 92 are connected to the negative electrode current collector plate 90 and the positive electrode current collector. Each surface 90A, 92A (see FIG. 9 for 92A) of the electric plate 92 is connected to the negative electrode 84 and the positive electrode 86 by laser welding or electron beam welding in which a laser beam or an electron beam 95 is irradiated. It is accommodated in a battery pack 98. Hereinafter, an example in which the positive electrode current collector plate 92 is connected to the positive electrode 86 will be described with reference to FIG.
[0003]
As shown in FIG. 9, a positive current collector 92 is placed on the positive electrode 86 constituting the power generation element 88, and the laser light 95 is irradiated from above the positive current collector 92, whereby the energy heat of the laser light 95 is increased. The end of the positive electrode protrusion 86A from which the edge of the positive electrode 86 protrudes and the positive electrode current collector plate 92 are heat-sealed. Thereby, the positive electrode current collector plate 92 can be connected to the end of the positive electrode protruding portion of the positive electrode 86 by the welded portion 93. In the case of the negative electrode 84 as well as the positive electrode 86, the end of the negative electrode protrusion of the negative electrode 84 is laser welded to the negative electrode current collector plate 90.
[0004]
[Problems to be solved by the invention]
By the way, in order to maintain the quality of the nickel-hydrogen battery 80, it is important to securely connect the negative electrode current collector plate 90 and the positive electrode current collector plate 92 to the negative electrode 84 and the positive electrode 86, respectively. For this reason, it is desired that the connectivity between the negative electrode 84 and the negative electrode current collector plate 90 be made higher and the connectivity between the positive electrode 86 and the positive electrode current collector plate 92 be made higher.
[0005]
In addition, in order to increase the productivity of the nickel / hydrogen battery 80, it is important that the negative electrode current collector plate 90 and the positive electrode current collector plate 92 can be easily connected to the negative electrode 84 and the positive electrode 86, respectively. For this reason, it is desired that the connection work between the negative electrode 84 and the negative electrode current collector plate 90 be simplified, and that the connection work between the positive electrode 86 and the positive electrode current collector plate 92 be simplified.
[0006]
The present invention has been made in view of the above-described problems, and an object thereof is to more reliably connect the negative electrode current collector plate and the positive electrode current collector plate to the negative electrode and the positive electrode, and the negative electrode current collector plate to the negative electrode and the positive electrode. And it is providing the sealed battery which can connect a positive electrode current collecting plate more easily.
[0007]
[Means for Solving the Problems]
Anode in the present invention, as described in claim 1, in which a current collecting plate of the power generating element and a pair provided with the negative electrode and the positive electrode via a separator, an edge portion of the negative electrode is protruded from the power generating element and a rim portion of the the protrusion positive electrode is protruded from the power generating element cathode protrusions, one of the previous SL collector plate, laser welding or electron beam irradiation is irradiated with a laser beam on the surface of the current collector plate The other end of the current collector plate is connected to the end of the negative electrode protrusion by electron beam welding, and the other end of the current collector plate is irradiated with laser light to the surface of the current collector plate or by electron beam welding to irradiate an electron beam. a connected sealed battery ends of the projections, at least one of the negative electrode projections and the positive electrode protrusion, sealed battery, characterized in that it comprises a bending portion.
[0008]
The negative electrode protrusions and has a flexion extension portion to at least one of the positive electrode protrusion, one of the anode and cathode is in elastic contact against the current collector plate. For this reason, even if a thing with short length is contained in a negative electrode and a positive electrode, all the negative electrodes and positive electrodes can be reliably contact | abutted to a current collecting plate. In addition, even if a short electrode is included in the negative electrode or the positive electrode, all of the negative electrode and the positive electrode can be easily brought into contact with the current collector plate.
[0009]
Moreover, in this invention, as described in Claim 2 , the said bending part is provided in the edge part of the said negative electrode protrusion part, or the edge part of the said positive electrode protrusion part, It is characterized by the above-mentioned.
[0010]
The bending portion is provided at the end of the negative electrode protrusion or the end of the positive electrode protrusion . For this reason, the bending / extending part is in surface contact with the current collector plate. Therefore, when laser welding or electron beam welding is performed, the bent portion of the negative electrode and the positive electrode can be wire-welded to the current collector plate. Therefore, the connection strength of the negative electrode and the positive electrode to the current collector plate is improved. One of the negative electrode and the positive electrode is in elastic contact with the current collector plate. For this reason, even if a thing with short length is contained in a negative electrode and a positive electrode, all the negative electrodes and positive electrodes can be reliably contact | abutted to a current collecting plate. In addition, even if a short electrode is included in the negative electrode or the positive electrode, all of the negative electrode and the positive electrode can be easily brought into contact with the current collector plate.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. In each embodiment described below, members and the like already described in FIG. 1 are given the same or corresponding reference numerals in the drawing to simplify or omit the description.
[0012]
A reference example is shown in FIG. As shown in FIG. 1, a nickel-hydrogen battery or lithium ion battery 10 of a reference example includes a power generation element 18 having a negative electrode 14 and a positive electrode 16 through a separator 12 (see also FIG. 2) , a negative electrode current collector plate 20 and the positive electrode current collector plate 22, and the power generation element 18 includes a negative electrode protrusion portion from which the edge portion of the negative electrode 14 protrudes and a positive electrode protrusion portion from which the edge portion of the positive electrode 16 protrudes, and the current collector plates 20, 22 However , each surface 20A, 22A (see FIG. 2 for 22A) of the negative electrode current collector plate 20 and the positive electrode current collector plate 22 is irradiated with a laser beam or an electron beam 25 (see FIG. 3) to form a negative electrode by laser welding or electron beam welding. 14 is a sealed battery that is connected to 14 and the positive electrode 16 and is housed in a substantially box-shaped sealed battery package 28 in this state.
[0013]
In addition, a nickel-hydrogen battery or a lithium ion battery 10 has a bent portion 15 and 17 the provided positive electrode projection of the negative electrode projections and the positive electrode 16 of the anode 14, these bent portions 15, 17 Are in surface contact with the negative electrode current collector plate 20 and the positive electrode current collector plate 22.
[0014]
As shown in FIG. 2, in the power generation element 18, the negative electrode protrusion of the negative electrode 14 protrudes from the left side 16A of the positive electrode 16 to the left, the bent side 15 is provided on the left side 14A, and the positive electrode protrusion of the positive electrode 16 The negative electrode 14 protrudes rightward from the right side 14B, and a bent portion 17 is provided on the right side 14B.
[0015]
As shown in FIG. 2, each of the bent portion 15 is bent all oriented in the same direction. Therefore, the bent portion 15 can be bent without widening the gap between the adjacent negative electrodes 14. Also, each of the bent portions 17 are bent all oriented in the same direction. Therefore, the bent portion 17 can be bent without widening the gap between the adjacent positive electrodes 16. For this reason, the volumetric efficiency of the power generation element 18 can be prevented from being lowered.
[0016]
The negative electrode current collector plate 20 is applied to the bent portion 15 of the negative electrode 14 as indicated by an arrow, and then connected by laser welding or electron beam welding. Thus, the negative electrode current collector plate 20 is attached to the left side of the power generation element 18. The positive electrode current collector plate 22 is connected to the bent portion 17 of the positive electrode 16 by laser welding or electron beam welding. Accordingly, the power generation element 18 is attached to the right side. In addition, the code | symbol 30 shown in FIG. 3 shows a welding part.
[0017]
The sealed battery package 28 shown in FIG. 1 includes an opening 29 for accommodating the power generation element 18 to which the negative electrode current collector plate 20 and the positive electrode current collector plate 22 are attached at the upper end. The power generation element 18 attached with the negative electrode current collector plate 20 and the negative electrode current collector plate 22 is accommodated in the sealed battery package 28 through the opening 29, and the nickel metal hydride battery or the lithium ion battery 10 is manufactured by closing the opening 29. The
[0018]
Next, an example of laser welding or electron beam welding of the positive electrode current collector plate 22 to the positive electrode 16 of the power generation element 18 will be described with reference to FIG. Note that the step of laser welding or electron beam welding of the negative electrode current collector plate 20 to the negative electrode 14 is the same as the step of laser welding or electron beam welding of the positive electrode current collector plate 22 to the positive electrode 16, and thus the description thereof is omitted.
[0019]
First, a power generation element 18 in which a negative electrode 14 and a positive electrode 16 are laminated via a separator 12 is prepared. Next, the positive electrode current collector plate 22 is placed on the bent portion 17 of the power generation element 18. Next, laser light or an electron beam 25 is irradiated from the surface 22 A side of the positive electrode current collector plate 22.
[0020]
The positive electrode 16 has a bent portion 17, and the bent portion 17 is in surface contact with the positive electrode current collector plate 22. Therefore, when laser welding or electron beam welding is performed, the bent portion 17 of the positive electrode 16 can be wire-welded to the positive electrode current collector plate 22. Therefore, the connection strength of the positive electrode 16 to the positive electrode current collector plate 22 is improved. In addition, the positive electrode current collector plate 22 can be easily connected to the positive electrode 17 by bringing the bent portion 17 into surface contact with the positive electrode current collector plate 22.
[0021]
Next, a first embodiment to a third embodiment of the present invention will be described with reference to FIG. 4 , FIG. 6, and FIG. As shown in FIG. 4, a nickel-hydrogen battery or a lithium ion battery 40 is a first embodiment according to the present invention includes a power generating element 45 to the negative electrode 42 and positive electrode 44 are laminated via a separator 12, negative electrode current and a collector plate 20 and positive collector plate 22, a positive electrode protrusion 44 B which edges the edge of the negative electrode protrusion 42 a protrudes from the power generating element 45 positive 44 protrudes from the power generating element 45 of the anode 42 The current collector plates 20 and 22 are connected to the negative electrode current collector plate 20 and the positive electrode current collector plate 22 by laser welding or electron beam welding to irradiate the respective surfaces 20A and 22A with laser light or electron beam 25. The sealed battery is connected to 44 and accommodated in a substantially box-shaped sealed battery package 28 (see FIG. 1) in this state.
[0022]
The nickel-hydrogen battery or a lithium-ion cell 40, at least one of the negative electrode protrude and the positive electrode protrusion, has a bending portion 46, the negative electrode current collector plate hand is of the negative electrode 42 and positive electrode 44 It is in elastic contact with 20 and the positive electrode current collector plate 22.
[0023]
Therefore, even if the negative electrode 42 or the positive electrode 44 includes a short one, all the negative electrodes 42 and the positive electrodes 44 can be reliably brought into contact with the negative electrode current collector plate 20 and the positive electrode current collector plate 22. . Therefore, the negative electrode 42 and the positive electrode 44 can be reliably connected to the negative electrode current collector plate 20 and the positive electrode current collector plate 22 by laser welding or electron beam welding, and the welding operation can be easily performed without taking time and effort.
[0024]
In addition, in the nickel-hydrogen battery or the lithium ion battery 40, the bent portions 46 and 48 are provided at the end of the negative electrode protrusion of the negative electrode 42 and the end of the positive electrode protrusion of the positive electrode 44. Therefore, the bending / extending part 46 is in surface contact with the negative electrode current collector plate 20, and the bending / extending part 48 is in surface contact with the positive electrode current collector plate 22. Therefore, when laser welding or electron beam welding is performed, the bent portions 46 and 48 of the negative electrode 20 and the positive electrode 22 can be wire-welded to the negative electrode current collector plate 20 and the positive electrode current collector plate 22. Therefore, the connection strength of the negative electrode 42 and the positive electrode 44 with respect to the negative electrode current collector plate 20 and the positive electrode current collector plate 22 is improved, and the welding operation can be easily performed without taking time and effort.
[0025]
As shown in FIG. 6, a nickel-hydrogen battery or a lithium ion battery 60 is a second embodiment according to the present invention, the edge portion of the negative electrode protrusions 62 A and a positive electrode 64 which edge portion of the negative electrode 62 protrudes from the power generating element There have flexions 60, 68 to the positive electrode protrusion 64 B projecting from the power generating element, elastically contact with the negative electrode 62 and hand the negative electrode current collector plate 20 and positive collector plate 22 of the cathode 64 Yes.
[0026]
For this reason, even if the negative electrode 62 and the positive electrode 64 have a short length, all the negative electrodes 62 and the positive electrodes 64 can be reliably brought into contact with the negative electrode current collector plate 20 and the positive electrode current collector plate 22. . Therefore, the negative electrode 62 and the positive electrode 64 can be reliably connected to the negative electrode current collector plate 20 and the positive electrode current collector plate 22 by laser welding or electron beam welding, and the welding operation can be easily performed without taking time and effort.
[0027]
As shown in FIG. 7, the third nickel-hydrogen battery or a lithium ion battery 70 is an embodiment of the present invention, the edge portion of the negative electrode protrusions 72 A and a positive electrode 74 which edges of the negative electrode 72 protrudes from the power generating element There have refractive Shinbu 76, 78 to the positive electrode protrusion 74 B projecting from the power generating element, the elastic contact against the anode 72 and hand the negative electrode current collector plate 20 and positive collector plate 22 of the cathode 74 ing.
[0028]
For this reason, even if the negative electrode 72 or the positive electrode 74 includes a short one, all the negative electrodes 72 and the positive electrodes 74 can be reliably brought into contact with the negative electrode current collector plate 20 and the positive electrode current collector plate 22. . Therefore, the negative electrode 72 and the positive electrode 74 can be reliably connected to the negative electrode current collector plate 20 and the positive electrode current collector plate 22 by laser welding or electron beam welding, and the welding operation can be easily performed without taking time and effort.
[0029]
The sealed battery of the present invention is not limited to the above-described embodiments, and appropriate modifications and improvements can be made. For example, the present invention has been described by taking a nickel-hydrogen battery or a lithium ion battery as an example of a sealed battery, but is not limited thereto, and can be applied to other sealed batteries.
[0030]
In addition, the materials, shapes, dimensions, forms, numbers, placement locations, thickness dimensions, etc. of the negative electrode, positive electrode, power generation element, current collector plate, bent portion, bent / extended portion, etc. exemplified in the above-described embodiments achieve the present invention. As long as it is possible, it is arbitrary and not limited.
[0031]
【The invention's effect】
In the present invention, as described in claim 1 , at least one of a negative electrode protrusion in which an edge of the negative electrode protrudes from the power generation element and a positive electrode protrusion in which an edge of the positive electrode protrudes from the power generation element is bent and extended. One of the negative electrode and the positive electrode is in elastic contact with the current collector plate. For this reason, even if a thing with short length is contained in a negative electrode and a positive electrode, all the negative electrodes and positive electrodes can be reliably contact | abutted to a current collecting plate. Therefore, the negative electrode and the positive electrode can be reliably connected to the current collector plate by laser welding or electron beam welding.
[0032]
In addition, even if a short length of negative electrode or positive electrode is included, all negative electrodes and positive electrodes can be easily brought into contact with the current collector plate. Can be done.
[0033]
In the present invention, as described in claim 2, flexions are kicked set to one of the ends of the end portion and the positive electrode projection of the negative electrode protrusion. For this reason, the bending / extending part is in surface contact with the current collector plate. Therefore, when laser welding or electron beam welding is performed, the bent portion of the negative electrode and the positive electrode can be wire-welded to the current collector plate. Therefore, the connection strength of the negative electrode and the positive electrode to the current collector plate is improved.
[0034]
Furthermore, one of the negative electrode and the positive electrode is in elastic contact with the current collector plate. For this reason, even if a thing with short length is contained in a negative electrode and a positive electrode, all the negative electrodes and positive electrodes can be reliably contact | abutted to a current collecting plate. Therefore, the negative electrode and the positive electrode can be reliably connected to the current collector plate by laser welding or electron beam welding. In addition, even if a short length of negative electrode or positive electrode is included, all negative electrodes and positive electrodes can be easily brought into contact with the current collector plate. Yes.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing a sealed battery of a reference example .
FIG. 2 is a cross-sectional view taken along line AA in FIG.
FIG. 3 is a diagram illustrating the operation of a sealed battery according to a reference example .
FIG. 4 is a cross-sectional view of a sealed battery according to the present invention .
FIG. 5 is a cross-sectional view of a sealed battery of a reference example.
FIG. 6 is a cross-sectional view of a sealed battery according to the present invention.
FIG. 7 is a cross-sectional view of a sealed battery according to the present invention.
FIG. 8 is an exploded perspective view showing a conventional sealed battery.
9 is a cross-sectional view taken along line BB in FIG.
[Explanation of symbols]
10, 40, 50, 60, 70 Sealed battery (nickel / hydrogen battery)
12 Separator
14, 42, 52, 62, 72 Negative electrode
14A, 42A, 52A, 62A, 72A Negative electrode protrusion
15, 17 Bending part
16, 44, 54, 64, 74 Positive electrode
16B, 44B, 54B, 64B, 74B Positive electrode protrusion
18, 45 Power generation element
20 Current collector plate (Negative electrode current collector plate)
20A Negative electrode current collector surface
22 Current collector (positive current collector)
22A Surface of positive current collector
25 Laser light
46,4 8, 6 6,68,76,78 flexions

Claims (2)

セパレータを介して負極および正極を具備した発電要素と一対の集電板とを備え、前記負極の縁部が前記発電要素から突出した負極突出部と前記正極の縁部が前記発電要素から突出した正極突出部とを備え、前記集電板の一方は、当該集電板の表面にレーザ光を照射するレーザ溶接若しくは電子線を照射する電子ビーム溶接により前記負極突出部の端部に接続され、前記集電板の他方は、当該集電板の表面にレーザ光を照射するレーザ溶接若しくは電子線を照射する電子ビーム溶接により前記正極突出部の端部に接続された密閉形電池であって、前記負極突出部および前記正極突出部のうちの少なくとも一方は、屈伸部を備えていることを特徴とする密閉形電池。Via a separator and a negative electrode and a generator element comprising a positive electrode and a pair of collector plates, projecting from the negative electrode edge section edges the power generating element of said negative electrode protrusion protruding from the power generating element cathode and a the positive electrode protrusion, one of the previous SL current collector plate, the end portion of the negative electrode protrusion by electron beam welding to be irradiated on the surface of those current collecting plate with a laser welding or electron beam is irradiated with a laser beam The other of the current collector plates is a sealed battery connected to the end of the positive electrode protruding portion by laser welding for irradiating the surface of the current collector plate with laser light or electron beam welding for irradiating an electron beam. And at least one of the said negative electrode protrusion part and the said positive electrode protrusion part is equipped with the bending extension part, The sealed battery characterized by the above-mentioned. 前記屈伸部は、前記負極突出部の端部または前記正極突出部の端部に設けられていることを特徴とする請求項１に記載した密閉形電池。2. The sealed battery according to claim 1 , wherein the bent portion is provided at an end portion of the negative electrode protruding portion or an end portion of the positive electrode protruding portion .
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