JP3845283B2

JP3845283B2 - Laser welding jig for electrode winding body and current collector plate in cylindrical electric double layer capacitor

Info

Publication number: JP3845283B2
Application number: JP2001275626A
Authority: JP
Inventors: 和三石本; 茂昭毛利
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 2001-09-11
Filing date: 2001-09-11
Publication date: 2006-11-15
Anticipated expiration: 2021-09-11
Also published as: JP2003086472A

Description

【０００１】
【発明の属する技術分野】
本発明は，円筒型電気二重層キャパシタにおける電極巻回体と集電板とのレーザ溶接用治具，特に，帯状正極，帯状負極およびそれらの一方を挟む２つの帯状セパレータよりなり，且つ帯状正極における帯状集電箔の長手方向に沿う一端縁部および帯状負極における帯状集電箔の長手方向に沿う他端縁部をそれぞれ両帯状セパレータの長手方向に沿う両端縁部から突出させた重合せ物を渦巻状に巻回した電極巻回体と，両集電箔の長手方向に沿う一，他端縁部の巻回による両接続部にそれぞれレーザ溶接された２つの集電板とを有する接合体を得るための治具に関する。
【０００２】
【関連技術】
現在，電気二重層キャパシタは自動車用クリーン動力源として大きな期待を寄せられている。その電気二重層キャパシタの量産に対応するためには前記接合体の生産性の向上を図ることは重要であり，そのためには好適なレーザ溶接用治具は欠くことができない。
【０００３】
【発明が解決しようとする課題】
この種の治具には，位置決め作業能率の向上を図るべく，電極巻回体および両集電板の組付け作業性が良好であること，また接合体の歩留りの向上を図るべく，集電板を接続部にレーザ溶接する前に，溶接後と同じ状態を現出させて各接続部において正，負極側集電箔の接触，つまり短絡が生じていないことを確認し得ることが要求される。
【０００４】
【課題を解決するための手段】
本発明は，前記要求を満足することが可能であって，前記接合体の生産性の向上を図る上で好適な前記レーザ溶接用治具を提供することを目的とする。
【０００５】
前記目的を達成するため本発明によれば，一端に開口部を，他端にレーザビームを照射するための溶接作業孔を持つ端壁をそれぞれ有する第１円筒体と，一端に，前記第１円筒体の開口部と合致する開口部を，他端にレーザビームを照射するための溶接作業孔を持つ端壁をそれぞれ有する第２円筒体と，前記第１，第２円筒体の両開口部を合致させて，それらの内部に入れられた前記電極巻回体の一方の前記接続部に一方の前記集電板を前記一方の端壁により加圧すると共に他方の前記接続部に他方の前記集電板を前記他方の端壁により加圧した状態にて前記第１，第２円筒体間を連結する連結部材と，連結状態にある前記第１，第２円筒体間を電気的に絶縁する手段とを有する，円筒型電気二重層キャパシタにおける電極巻回体と集電板とのレーザ溶接用治具が提供される。
【０００６】
前記のように二分割式に構成された第１，第２円筒体を合せてそれらの内部に電極巻回体および両集電板を保持させるようにすると，治具に対する電極巻回体等の組付け作業性が良好となる。また両端壁，したがって両円筒体によって両集電板を両接続部にそれぞれ加圧し，その加圧状態を連結部材により保持し，これにより両集電板を両接続部に確実に密着させることができる。
【０００７】
前記加圧保持状態にてレーザ溶接が行われるので，その加圧保持状態はレーザ溶接後と殆ど変わらない。その上，両円筒体間は電気的に絶縁されているので，レーザ溶接前において両集電板間の抵抗測定を行うことによって，正，負極側の集電箔の接触，特に両接続部における短絡の有無を調べることができる。
【０００８】
【発明の実施の形態】
図１，２において，円筒型電気二重層キャパシタ１は円筒状密閉容器２を有し，その密閉容器２内に電極巻回体３，２つの円盤状集電板４，５および電解液が収容されている。
【０００９】
図３に示すように，電極巻回体３は次のように構成されている。即ち，帯状正極６，帯状負極７およびそれらの一方，実施例では帯状正極６を挟む２つの帯状セパレータ８，９よりなり，且つ帯状正極６におけるＡｌ製帯状集電箔１０の長手方向に沿う一端縁部１０ａおよび帯状負極７におけるＡｌ製帯状集電箔１１の長手方向に沿う他端縁部１１ｂをそれぞれ両帯状セパレータ８，９の長手方向に沿う両端縁部から突出させた重合せ物を，帯状正極６の内側に在る一方の帯状セパレータ８が最も内側に位置するようにＡｌ製巻心１２を中心に渦巻状に巻回したものである。この場合，帯状正，負極６，７間に存する他方の帯状セパレータ９は，最外周の帯状負極７を覆うべく略一巻分だけ帯状負極７の終端より延出している。
【００１０】
帯状正，負極６，７において，それらの帯状集電箔１０，１１の両面に一対の分極性電極１３がそれぞれ積層形成されている。ただし，両集電箔１０，１１において，両セパレータ８，９から突出する，長手方向に沿う前記一，他端縁部１０ａ，１１ａには電極は存在せず，それら両端縁部１０ａ，１１ａは巻回によって集電板４，５との接続部１４，１５を形成する。
【００１１】
図１，２，４に示すように，密閉容器２はＡｌ製有底筒形本体２ａと，その開口を閉鎖する蓋体１６とよりなり，その蓋体１６は次のように構成される。蓋体１６はＡｌ合金製短円筒体１７を有し，その一端部が筒形本体２ａの開口に嵌合され，その一端部近傍外周面に存する環状突出部１８が筒形本体２ａにレーザ溶接される。また短円筒体１７の一端部近傍内周面に存する環状突出部１９に電気絶縁性樹脂製環状板２０の外周溝２１が嵌着され，またその環状板２０の内周溝２２にＡｌ合金製筒状正極端子２３の外周面に存する環状突出部２４が嵌着されている。
【００１２】
図５にも示すように，一方のＡｌ合金製円盤状集電板４において，その中心に在るボス２６は筒状正極端子２３の中心孔２７に挿入されてそれにレーザ溶接されている。また円盤部２８は，放射状に配列されて下方に突出する複数，実施例では６つの横断面Ｕ字形をなす凹条２９を有し，それら凹条２９の底部に帯状正極６の接続部１４が押し潰された状態にてレーザ溶接されている。
【００１３】
このレーザ溶接に当っては，図６に示すように電極巻回体３の接続部１４に集電板４を当て，次いで，図７に示すようにその集電板４を接続部１４に向け加圧して各凹条２９の底部を接続部１４にそれを押し潰しながら食込ませ，この状態で凹条２９の開口側からその底部にレーザビームを照射してその底部および接続部１４の底部対応部を溶融，接合するものである。このように接続部１４を押し潰す理由は次の通りである。即ち，１枚の箔にレーザビームを照射した場合，溶融金属が流出して底部との接合を行うことができないが，押し潰しによって箔が重なり合った部分を形成すると，溶融金属を凹条２９近傍にとどめて，その底部の溶融金属と融合させることができるのである。
【００１４】
図８にも示すように，他方のＡｌ合金製円盤状集電板５において，その中心に在るボス３０は，図９にも示すように，負極端子３２である有底筒形本体２ａの底壁にある中心孔３３に挿入されてレーザ溶接されている。また円盤部３４は，放射状に配列されて上方へ突出する複数，実施例では６つの横断面逆Ｕ字形をなす凸条３５を有し，それら凸条３５の稜線状部分に帯状負極７の接続部１５が前記と同様の理由から押し潰された状態にてレーザ溶接されている。底壁外面には，中心孔３３を囲む環状突出部３６が存する。
【００１５】
正極側集電板４と負極側集電板５の両円盤部２８，３４は同一の形状を有し，相隣る両凹条２９間および両凸条３５間には電解液を通すための貫通孔３７が形成されている。
【００１６】
電解液は，負極側円盤状集電板５のボス３０に形成された注入孔３８から密閉容器２内に注入され，その後，注入孔３８は，図示しないゴム栓により封鎖される。
【００１７】
電気二重層キャパシタ１の組立て時において，電極巻回体３と両集電板４，５とは，図１０（図６，７も参照）に示すように，電極巻回体３の両接続部１４，１５に両集電板４，５をそれぞれレーザ溶接して得られる接合体３９として用いられる。
【００１８】
以下，この接合体３９を得るために用いられるレーザ溶接用治具について説明する。
【００１９】
図１１〜１５において，治具４０は，第１円筒体４１と，その第１円筒体４１に，それと同軸上において合致する第２円筒体４２と，第１，第２円筒体４１，４２間を連結する連結部材４３と，連結状態にある第１，第２円筒体４１，４２間を電気的に絶縁する手段とを有する。
【００２０】
第１円筒体４１は，前記電気的絶縁手段を具現化すべく，合成樹脂より構成されており，両端を開放された中空筒形本体４４と，その中空筒形本体４４の一端に，その開口部を覆うように取付けられて端壁を構成する端板４５とを有する。中空筒形本体４４は，その一端部に幅の狭い環状端面４６と，それの内周側から突出する環状大径突出部４７を有し，またその他端部に幅の広い環状端面４８と，それの内周側から突出する環状小径突出部４９を有する。その環状小径突出部４９は第１円筒体４１の開口部５０を形成する。
【００２１】
大径突出部４７の内周側に存する環状凹部５１に端板４５が嵌合されて複数の小ねじ５２によって大径突出部４７に固定されている。端板４５は，図１１に明示するように，各集電板４，５のボス２６，３０を受容し得る中心孔５３と，その中心孔５３から放射状に延びて各集電板４，５の凹条２９および凸条３５に合致し得ることが可能な６つのスロット状溶接作業孔５４と，各溶接作業孔５４と，各凹条２９および各凸条３５とを合致させるべく，中心孔５３を挟んで形成された２つの位置決め孔５５と，両位置決め孔５５にそれぞれ嵌着された２つの位置決めピン５６とを有する。両位置決めピン５６は，各集電板４，５においてボス２６，３０を挟む位置にある２つの貫通孔３７に挿入されるようになっている。各溶接作業孔５４はレーザビームを各集電板４，５の各凹条２９および各凸条３５に照射するために用いられる。第２円筒体４２は，第１円筒体４１同様に，合成樹脂より構成されており，両端を開放された中空筒形本体５７と，その中空筒形本体５７の一端に，その開口部を覆うように取付けられて端壁を構成する，前記と同一構造の端板４５とを有する。中空筒形本体５７は，その一端部に幅の狭い環状端面５８と，それの内周側から突出する環状大径突出部５９を有し，またその他端部に幅の広い環状端面６０と，それの内周側から落ち込む環状小径凹部６１を有する。その環状小径凹部６１はその環状底面内周部によって第２円筒体４２の開口部６２を形成する。
【００２２】
大径突出部５９の内周側に存する環状凹部６３に端板４５が嵌合されて複数の小ねじ５２によって大径突出部５９に固定されている。この大径突出部５９，幅の狭い環状端面５８および環状凹部６３に関するサイズは，それぞれ第１円筒体４１におけるそれら４７，４６，５１のサイズと同一である。また環状小径凹部６１は第１円筒体４１の環状小径突出部４９と嵌合関係にあるが，その凹部６１の深さは突出部４９の高さよりも大である。
【００２３】
第２円筒体４２に，それの幅の広い環状端面６０から突出するように１つの位置決めピン６４が設けられている。一方，第１円筒体４１には，それの幅の広い環状端面４８に開口するように１つの位置決め孔６５が設けられている。この位置決め孔６５と位置決めピン６４とを嵌合させることによって両円筒体４１，４２が相互に位置決めされ，両端板４５の各溶接作業孔５４および各位置決めピン５６が合致する。
【００２４】
また第１，第２円筒体４１，４２間を連結する連結部材４３としては，図１４，１５に示すように市販の，トグル機構を用いた簡易連結金具が用いられている。その連結部材４３は，第２円筒体４２外周面の平坦面部６６にＡｌ合金製取付台６７を介して配設された，可動側係合爪６８を有する部材本体６９と，第１円筒体４１外周面の平坦面部７０にＡｌ合金製取付台７１を介して配設された固定側係合爪７２とよりなる。部材本体６９において，それは取付台６７に固定され，且つ一対の立上り部７３を有する支持体７４を有し，その両立上り部７２に架設された支持軸７５に操作子７６における両側板部７７の一端側が回転可能に取付けられる。両側板部７７の他端側にはそれぞれ長孔７８が形成され，それら長孔７８に架設された摺動軸７９にコ字形をなす可動側係合孔６８の両端部が回転可能に取付けられる。操作子７６の一部であって，両側板部７７の支持軸取付部分側において両側板部７７間に位置するようにリテーナ部８０が折曲げ形成されており，そのリテーナ部８０と，摺動軸７９と一体化されているリテーナ部８１との間に２つのコイルばね８２が圧縮状態で保持されている。
【００２５】
図１１，１２，１３において，レーザ溶接用ノズルは１つの溶接作業孔５４をその長手方向に沿って移動するようになっており，１つの溶接作業孔５４について溶接を行った後は，隣りの溶接作業孔５４について溶接作業を行うべく，治具４０を６０°回転させなければならない。そのため，治具４０を，回転装置のチャック８３に取付けられた保持部材８４に立設するようになっている。その保持部材８４は，上向きに開口する浅い凹部８５を有する円筒状部８６と，その外周に存するフランジ部８７とよりなり，そのフランジ部８７に，その中心を挟むと共にその環状端面から突出するように２つの位置決めピン８８が設けられている。これに対応して，第１，第２円筒体４１，４２には，それらの軸線を挟んで，幅の狭い環状端面４６，５８に開口する２つの位置決め孔８９が形成されている。
【００２６】
接合体３９の製造に当っては，図１３，１６において，先ず，第１円筒体４１と非連結状態にある第２円筒体４２を，それの環状大径突出部５９を下側にして作業台上に立設し，その第２円筒体４２内に開口部６２から負極側の集電板５をそのボス３０を下側に向けて，例えばピンセットにより摘んで入れ，ボス３０を端板４５の中心孔５３に，また２つの貫通孔３７を２つの位置決めピン５６に嵌める。これにより各溶接作業孔５４と各凸条３５とが合致する。次いで電極巻回体３を第２円筒体４２内に入れて一方の接続部１５を集電板５に当て，さらに電極巻回体３の他方の接続部１４上に正極側の集電板４をそのボス２６を上側に向けて載せ，その後第１円筒体４１を電極巻回体３および集電板４に被せて端板４５の中心孔５３をボス２６に嵌め，また第２円筒体４２の位置決めピン６４に第１円筒体４１の位置決め孔６５を嵌合させ，さらに環状小径突出部４９を環状小径凹部６１に嵌めて両開口部５０，６２を合致させ，さらにまた集電板４を必要に応じ動かして２つの貫通孔３７を２つの位置決めピン５６に嵌め，各溶接作業孔５４と各凹条２９とを合致させる。この状態では両接続部１４，１５は殆ど潰れておらず，また第１円筒体４１の幅の広い環状端面４８は第２円筒体４２の幅の広い環状端面６０に当接していない。
【００２７】
そこで，各連結部材４３の可動側係合爪６８を固定側係合爪７２に係合させ，次いで操作子７６を，図１５，時計方向に回動させることにより思案点を越えさせて倒伏させ，図１４に示すように第１，第２円筒体４１，４２を連結する。これにより正極側の接続部１４および端板４５間に存する集電板４がその接続部１４に，また負極側の接続部１５および端板４５間に存する集電板５がその接続部１５にそれぞれ加圧されて，各凹条２９および各凸条３５がそれら接続部１４，１５に食込むと共にそれら接続部１４，１５が押し潰される。
【００２８】
この状態において，両集電板４，５のボス２６，３０間の抵抗測定を行う。この場合，例えば両接続部１４，１５等で正，負極側集電箔１０，１１が接触する等の短絡が生じていれば抵抗値が下がることによってそれを知ることができる。
【００２９】
短絡が生じていない場合には，図１２に示すように例えば第２円筒体４２の環状大径突出部５９を保持部材８４の凹部８５に嵌合すると共に両位置決め孔８９を両位置決めピン８８にそれぞれ嵌める。これにより，レーザ溶接用ノズルに対して正極側の１つの溶接作業孔５４が位置決めされる。
【００３０】
レーザ溶接用ノズルから溶接作業孔５４を通して集電板４の凹条２９の底壁にレーザビームを照射し，その底壁および接続部１４，したがって重なり合った集電箔間を溶接する。その後，治具を６０°宛間欠回転させて前記同様にレーザ溶接を行う。
【００３１】
正極側のレーザ溶接を終了した後は治具４０を上下逆様にして，正極側と同様に負極側についてレーザ溶接を行う。この場合，正極側の集電板４におけるボス２６の突出量が大きいが，その端板４５からの先端部側は保持部材８４の底壁に形成された貫通孔９０に受容される。
【００３２】
【発明の効果】
本発明によれば前記のように構成することによって，電極巻回体および両集電板の組付け作業性を良好にして位置決め作業能率を向上させることができ，また両集電板を電極巻回体の両接続部に確実に密着させることができ，さらにレーザ溶接前に電極巻回体における短絡の有無を確認して接合体の歩留りを向上させることができる，円筒型電気二重層キャパシタにおける電極巻回体と集電板とのレーザ溶接用治具を提供することが可能である。
【図面の簡単な説明】
【図１】円筒型電気二重層キャパシタの正面図である。
【図２】図１の２−２線断面図である。
【図３】電極巻回体の構造説明用要部破断斜視図である。
【図４】図１の４矢視図である。
【図５】正極側の円盤状集電板を上方から見た場合の斜視図である。
【図６】接続部に集電板を載せた状態を示す部分正面図である。
【図７】接続部を集電板を介して押し潰した状態を示す部分正面図である。
【図８】負極側の円盤状集電板を下方から見た場合の斜視図である。
【図９】図１の９矢視図である。
【図１０】接合体の正面図である。
【図１１】治具の平面図で，図１２の１１矢視図に相当する。
【図１２】図１１の１２−１２線断面図である。
【図１３】連結部材を省略した治具の分解斜視図である。
【図１４】治具の連結部における拡大側面図である。
【図１５】治具の連結部における拡大斜視図である。
【図１６】治具に電極巻回体および両集電板を組付けた状態を示す断面図で，図１２に対応する。
【符号の説明】
１……………円筒型電気二重層キャパシタ
３……………電極巻回体
４，５………円盤状集電板
６……………帯状正極
７……………帯状負極
８，９………帯状セパレータ
１０，１１…帯状集電箔
１０ａ………一端縁部
１１ａ………他端縁部
１４，１５…接続部
３９…………接合体
４０…………治具
４３…………連結部材
４５…………端板（端壁）
５０…………開口部
５４…………溶接作業孔
６２…………開口部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a laser welding jig for an electrode winding body and a current collector plate in a cylindrical electric double layer capacitor, in particular, a belt-like positive electrode, a belt-like negative electrode, and two belt-like separators sandwiching one of them. A superposed product in which one end edge along the longitudinal direction of the strip-shaped current collector foil and the other end edge along the longitudinal direction of the strip-shaped current collector foil in the strip-shaped negative electrode are respectively projected from both end edges along the longitudinal direction of both strip-shaped separators. A spirally wound electrode winding body, and two current collector plates each welded to both connecting portions by winding the other end edge along the longitudinal direction of both current collector foils The present invention relates to a jig for obtaining a body.
[0002]
[Related technologies]
At present, electric double layer capacitors are highly expected as clean power sources for automobiles. In order to cope with the mass production of the electric double layer capacitor, it is important to improve the productivity of the joined body. For this purpose, a suitable laser welding jig is indispensable.
[0003]
[Problems to be solved by the invention]
This type of jig has a good current collection work in order to improve the positioning work efficiency, the workability of assembling the electrode winding body and both current collector plates, and the yield of the joined body. Before laser welding the plate to the connection, it is required that the same state as after welding appears and it can be confirmed that there is no contact between the positive and negative current collector foils at each connection, that is, no short circuit has occurred. The
[0004]
[Means for Solving the Problems]
It is an object of the present invention to provide the laser welding jig that can satisfy the requirements and is suitable for improving the productivity of the joined body.
[0005]
In order to achieve the above object, according to the present invention, a first cylindrical body having an end wall having an opening at one end and a welding work hole for irradiating a laser beam at the other end, and the first cylinder at one end. A second cylindrical body having an opening that matches the opening of the cylindrical body, an end wall having a welding work hole for irradiating a laser beam at the other end, and both openings of the first and second cylindrical bodies; The one current collector plate is pressurized by the one end wall to one of the connection portions of the electrode winding body placed in them, and the other connection portion has the other current collector. Electrically insulates the connecting member that connects the first and second cylindrical bodies with the electric plate pressed by the other end wall, and the first and second cylindrical bodies that are in a connected state. An electrode winding body and a current collector plate in a cylindrical electric double layer capacitor Laser welding jig is provided.
[0006]
When the first and second cylindrical bodies configured in a two-divided manner as described above are combined and the electrode winding body and both current collector plates are held therein, the electrode winding body for the jig, etc. Assembling workability is improved. In addition, both current collector plates are pressed against both connecting portions by both end walls, and thus both cylindrical bodies, and the pressed state is held by a connecting member, so that both current collector plates can be securely attached to both connecting portions. it can.
[0007]
Since laser welding is performed in the pressure holding state, the pressure holding state is almost the same as that after laser welding. In addition, since the two cylinders are electrically insulated, by measuring the resistance between the current collector plates before laser welding, contact between the positive and negative current collector foils, especially at the two connections The presence or absence of a short circuit can be checked.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
1 and 2, a cylindrical electric double layer capacitor 1 has a cylindrical sealed container 2 in which an electrode winding body 3, two disk-shaped current collector plates 4, 5 and an electrolytic solution are accommodated. Has been.
[0009]
As shown in FIG. 3, the electrode winding body 3 is configured as follows. That is, the strip-shaped positive electrode 6, the strip-shaped negative electrode 7, and one of them, in the embodiment, two strip-shaped separators 8 and 9 sandwiching the strip-shaped positive electrode 6, and one end of the strip-shaped positive electrode 6 along the longitudinal direction of the Al strip-shaped current collector foil 10. A superposition product in which the other end edge portion 11b along the longitudinal direction of the Al strip-shaped current collector foil 11 in the edge portion 10a and the strip-like negative electrode 7 is protruded from both edge portions along the longitudinal direction of both the strip-like separators 8 and 9, respectively. The belt-shaped positive electrode 6 is wound in a spiral shape around an Al core 12 so that one strip-shaped separator 8 located inside the strip-shaped positive electrode 6 is positioned on the innermost side. In this case, the other strip separator 9 existing between the strip-shaped positive and negative electrodes 6 and 7 extends from the end of the strip-shaped negative electrode 7 by approximately one turn so as to cover the outermost strip-shaped negative electrode 7.
[0010]
In the belt-like positive and negative electrodes 6 and 7, a pair of polarizable electrodes 13 are laminated on both surfaces of the belt-like current collecting foils 10 and 11, respectively. However, in both current collector foils 10 and 11, there is no electrode on the one and the other end edges 10a and 11a along the longitudinal direction protruding from both separators 8 and 9, and both end edges 10a and 11a are The connecting portions 14 and 15 with the current collector plates 4 and 5 are formed by winding.
[0011]
As shown in FIGS. 1, 2, and 4, the sealed container 2 includes an Al-bottomed cylindrical main body 2 a and a lid 16 that closes its opening, and the lid 16 is configured as follows. The lid 16 has an Al alloy short cylindrical body 17, one end of which is fitted into the opening of the cylindrical main body 2 a, and an annular protrusion 18 existing on the outer peripheral surface in the vicinity of the one end is laser welded to the cylindrical main body 2 a. Is done. Further, an outer peripheral groove 21 of an annular plate 20 made of an electrically insulating resin is fitted into an annular protrusion 19 existing on the inner peripheral surface in the vicinity of one end of the short cylindrical body 17, and an Al alloy is formed in an inner peripheral groove 22 of the annular plate 20. An annular protrusion 24 existing on the outer peripheral surface of the cylindrical positive terminal 23 is fitted.
[0012]
As shown also in FIG. 5, in one Al alloy disk-shaped current collector plate 4, the boss 26 at the center is inserted into the center hole 27 of the cylindrical positive terminal 23 and laser welded thereto. Further, the disk portion 28 has a plurality of concave stripes 29 that are arranged radially and project downward, and in the embodiment, have six U-shaped cross sections. Laser welding is performed in a crushed state.
[0013]
In this laser welding, the current collector plate 4 is applied to the connection portion 14 of the electrode winding body 3 as shown in FIG. 6, and then the current collector plate 4 is directed to the connection portion 14 as shown in FIG. Under pressure, the bottom of each recess 29 is squeezed into the connecting portion 14 while crushing it. In this state, the bottom of the recess 29 is irradiated with a laser beam from the opening side of the recess 29 and the bottom of the connecting portion 14. The corresponding part is melted and joined. The reason for crushing the connecting portion 14 in this way is as follows. That is, when a single foil is irradiated with a laser beam, the molten metal flows out and cannot be joined to the bottom, but if the foil is overlapped by crushing, the molten metal is removed from the vicinity of the recess 29. It can be fused with the molten metal at the bottom.
[0014]
As shown in FIG. 8, in the other Al alloy disk-shaped current collector plate 5, the boss 30 at the center of the bottomed cylindrical main body 2a, which is the negative electrode terminal 32, is also shown in FIG. It is inserted into the center hole 33 in the bottom wall and laser welded. The disk portion 34 has a plurality of ridges 35 that are arranged radially and protrude upward, and in the embodiment, have six ridges 35 having an inverted U-shaped cross section. The part 15 is laser welded in a crushed state for the same reason as described above. An annular protrusion 36 surrounding the center hole 33 exists on the outer surface of the bottom wall.
[0015]
Both the disk portions 28 and 34 of the positive current collector 4 and the negative current collector 5 have the same shape, and are used for passing the electrolyte between the adjacent ridges 29 and between the ridges 35. A through hole 37 is formed.
[0016]
The electrolytic solution is injected into the sealed container 2 from the injection hole 38 formed in the boss 30 of the negative electrode side disk-shaped current collector plate 5, and then the injection hole 38 is sealed with a rubber stopper (not shown).
[0017]
When the electric double layer capacitor 1 is assembled, as shown in FIG. 10 (see also FIGS. 6 and 7), the electrode winding body 3 and the current collector plates 4 and 5 are connected to each other. 14 and 15 are used as a joined body 39 obtained by laser welding the current collector plates 4 and 5 respectively.
[0018]
Hereinafter, a laser welding jig used to obtain the joined body 39 will be described.
[0019]
11 to 15, the jig 40 includes a first cylindrical body 41, a second cylindrical body 42 that coaxially matches the first cylindrical body 41, and the first and second cylindrical bodies 41, 42. And a means for electrically insulating the first and second cylindrical bodies 41 and 42 in the connected state.
[0020]
The first cylindrical body 41 is made of synthetic resin so as to embody the electrical insulation means, and has a hollow cylindrical body 44 that is open at both ends, and an opening at one end of the hollow cylindrical body 44. And an end plate 45 which is attached so as to cover the end wall and constitutes an end wall. The hollow cylindrical main body 44 has a narrow annular end surface 46 at one end thereof, a large annular projecting portion 47 projecting from the inner peripheral side thereof, and a wide annular end surface 48 at the other end thereof, It has an annular small-diameter protruding portion 49 protruding from the inner peripheral side thereof. The annular small-diameter protrusion 49 forms the opening 50 of the first cylindrical body 41.
[0021]
An end plate 45 is fitted into an annular recess 51 existing on the inner peripheral side of the large-diameter protrusion 47 and fixed to the large-diameter protrusion 47 by a plurality of small screws 52. As clearly shown in FIG. 11, the end plate 45 has a center hole 53 that can receive the bosses 26, 30 of the current collector plates 4, 5, and extends radially from the center hole 53. In order to match the six slot-shaped welding work holes 54 that can be matched with the concave ridges 29 and the convex ridges 35, the respective welding work holes 54, and the respective concave ridges 29 and the respective ridges 35, the center hole 53, two positioning holes 55 formed on both sides of the positioning hole 53, and two positioning pins 56 fitted into the positioning holes 55, respectively. Both positioning pins 56 are inserted into the two through holes 37 at the positions where the bosses 26 and 30 are sandwiched between the current collecting plates 4 and 5. Each welding work hole 54 is used to irradiate each concave strip 29 and each convex strip 35 of each current collector plate 4, 5 with a laser beam. The second cylindrical body 42 is made of a synthetic resin like the first cylindrical body 41, and covers the opening at one end of the hollow cylindrical main body 57 that is open at both ends. And an end plate 45 having the same structure as described above. The hollow cylindrical main body 57 has a narrow annular end surface 58 at one end thereof, a large annular projection 59 projecting from the inner peripheral side thereof, and a wide annular end surface 60 at the other end, It has an annular small-diameter recess 61 that falls from its inner peripheral side. The annular small-diameter recess 61 forms an opening 62 of the second cylindrical body 42 by the annular bottom inner peripheral portion.
[0022]
An end plate 45 is fitted into an annular recess 63 existing on the inner peripheral side of the large-diameter protruding portion 59 and fixed to the large-diameter protruding portion 59 by a plurality of small screws 52. The sizes of the large-diameter protruding portion 59, the narrow annular end surface 58, and the annular recess 63 are the same as those 47, 46, and 51 in the first cylindrical body 41, respectively. The annular small-diameter recess 61 is in a fitting relationship with the annular small-diameter protrusion 49 of the first cylindrical body 41, but the depth of the recess 61 is greater than the height of the protrusion 49.
[0023]
One positioning pin 64 is provided on the second cylindrical body 42 so as to protrude from the wide annular end surface 60 thereof. On the other hand, the first cylindrical body 41 is provided with one positioning hole 65 so as to open to the wide annular end surface 48 thereof. By fitting the positioning hole 65 and the positioning pin 64, the cylindrical bodies 41 and 42 are positioned relative to each other, and the welding work holes 54 and the positioning pins 56 of the both end plates 45 are aligned.
[0024]
Moreover, as the connection member 43 which connects between the 1st, 2nd cylindrical bodies 41 and 42, as shown in FIG.14, 15, the simple connection metal fitting using a toggle mechanism is used. The connecting member 43 includes a member main body 69 having a movable side engaging claw 68 disposed on a flat surface portion 66 of the outer peripheral surface of the second cylindrical body 42 via an Al alloy mounting base 67, and the first cylindrical body 41. It consists of a fixed-side engaging claw 72 disposed on an outer peripheral flat surface portion 70 via an Al alloy mounting base 71. In the member main body 69, it has a support body 74 fixed to the mounting base 67 and having a pair of rising portions 73, and a support shaft 75 erected on the compatible rising portion 72 on both side plate portions 77 of the operation element 76. One end side is rotatably attached. Long holes 78 are formed on the other end sides of the both side plate portions 77, and both end portions of a movable engagement hole 68 having a U-shape are rotatably attached to a sliding shaft 79 installed in the long holes 78. . A retainer portion 80 is formed as a part of the operation element 76 so as to be positioned between the both side plate portions 77 on the support shaft mounting portion side of the both side plate portions 77. Two coil springs 82 are held in a compressed state between the shaft 79 and the retainer portion 81 integrated.
[0025]
In FIGS. 11, 12, and 13, the laser welding nozzle moves along the longitudinal direction of one welding work hole 54, and after welding one welding work hole 54, In order to perform the welding operation on the welding work hole 54, the jig 40 must be rotated by 60 °. Therefore, the jig 40 is erected on a holding member 84 attached to the chuck 83 of the rotating device. The holding member 84 includes a cylindrical portion 86 having a shallow concave portion 85 that opens upward, and a flange portion 87 existing on the outer periphery thereof. The flange portion 87 sandwiches the center and protrudes from the annular end surface. Two positioning pins 88 are provided. Correspondingly, two positioning holes 89 are formed in the first and second cylindrical bodies 41 and 42 so as to open to the narrow end faces 46 and 58 with the axis therebetween.
[0026]
In manufacturing the joined body 39, in FIGS. 13 and 16, first, the second cylindrical body 42 which is not connected to the first cylindrical body 41 is operated with its annular large-diameter protruding portion 59 on the lower side. Standing on a table, the current collector plate 5 on the negative electrode side is inserted into the second cylindrical body 42 from the opening 62 with the boss 30 facing downward, for example, by tweezers, and the boss 30 is inserted into the end plate 45. The two through holes 37 are fitted into the two positioning pins 56. Thereby, each welding work hole 54 and each protruding item | line 35 correspond. Next, the electrode winding body 3 is placed in the second cylindrical body 42, one connection portion 15 is applied to the current collector plate 5, and the positive current collector plate 4 is placed on the other connection portion 14 of the electrode winding body 3. The first boss 41 is placed on the electrode winding body 3 and the current collector plate 4 so that the center hole 53 of the end plate 45 is fitted to the boss 26, and the second cylindrical body 42 is mounted. The positioning hole 65 of the first cylindrical body 41 is fitted to the positioning pin 64, and the annular small-diameter protruding portion 49 is fitted into the annular small-diameter concave portion 61 so that the openings 50 and 62 are aligned. The two through holes 37 are fitted to the two positioning pins 56 by moving as necessary, and the respective welding work holes 54 and the respective concave stripes 29 are matched. In this state, the connecting portions 14 and 15 are hardly crushed, and the wide annular end surface 48 of the first cylindrical body 41 is not in contact with the wide annular end surface 60 of the second cylindrical body 42.
[0027]
Therefore, the movable side engaging claws 68 of the respective connecting members 43 are engaged with the fixed side engaging claws 72, and then the operation element 76 is rotated in a clockwise direction in FIG. , The first and second cylindrical bodies 41 and 42 are connected as shown in FIG. Thus, the current collector plate 4 existing between the positive electrode side connection portion 14 and the end plate 45 is connected to the connection portion 14, and the current collector plate 5 existing between the negative electrode side connection portion 15 and the end plate 45 is connected to the connection portion 15. By being pressurized, each concave line 29 and each convex line 35 bite into the connection parts 14 and 15 and the connection parts 14 and 15 are crushed.
[0028]
In this state, the resistance between the bosses 26 and 30 of the current collector plates 4 and 5 is measured. In this case, for example, if there is a short circuit such as contact between the positive and negative current collector foils 10 and 11 at both the connecting parts 14 and 15, it is possible to know that the resistance value decreases.
[0029]
When no short circuit occurs, for example, as shown in FIG. 12, the annular large-diameter protruding portion 59 of the second cylindrical body 42 is fitted into the concave portion 85 of the holding member 84 and the positioning holes 89 are formed in the positioning pins 88. Fit each one. Thus, one welding work hole 54 on the positive electrode side is positioned with respect to the laser welding nozzle.
[0030]
A laser beam is irradiated to the bottom wall of the concave strip 29 of the current collector plate 4 from the laser welding nozzle through the welding work hole 54, and the bottom wall and the connection portion 14, and thus the overlapping current collector foils are welded. Thereafter, the jig is intermittently rotated to 60 °, and laser welding is performed in the same manner as described above.
[0031]
After the laser welding on the positive electrode side is completed, the jig 40 is turned upside down and laser welding is performed on the negative electrode side in the same manner as the positive electrode side. In this case, the protruding amount of the boss 26 in the positive current collecting plate 4 is large, but the tip end side from the end plate 45 is received in the through hole 90 formed in the bottom wall of the holding member 84.
[0032]
【The invention's effect】
According to the present invention, the construction as described above makes it possible to improve the assembly workability of the electrode winding body and both current collector plates and improve the positioning work efficiency. In a cylindrical electric double layer capacitor that can be securely attached to both connecting parts of a rotating body, and that the yield of the bonded body can be improved by checking for short-circuits in the electrode winding body before laser welding. It is possible to provide a jig for laser welding between the electrode winding body and the current collector plate.
[Brief description of the drawings]
FIG. 1 is a front view of a cylindrical electric double layer capacitor.
FIG. 2 is a sectional view taken along line 2-2 of FIG.
FIG. 3 is a fragmentary perspective view for explaining a structure of an electrode winding body.
4 is a view taken in the direction of arrow 4 in FIG.
FIG. 5 is a perspective view when a disc-shaped current collector on the positive electrode side is viewed from above.
FIG. 6 is a partial front view showing a state in which a current collector plate is placed on a connection portion.
FIG. 7 is a partial front view showing a state in which a connection portion is crushed through a current collector plate.
FIG. 8 is a perspective view of the negative electrode disc-shaped current collector plate as viewed from below.
FIG. 9 is a view taken along arrow 9 in FIG. 1;
FIG. 10 is a front view of a joined body.
11 is a plan view of the jig and corresponds to a view taken in the direction of arrow 11 in FIG.
12 is a sectional view taken along line 12-12 of FIG.
FIG. 13 is an exploded perspective view of a jig in which a connecting member is omitted.
FIG. 14 is an enlarged side view of the connecting portion of the jig.
FIG. 15 is an enlarged perspective view of a connecting portion of a jig.
16 is a cross-sectional view showing a state in which the electrode winding body and both current collector plates are assembled to a jig, and corresponds to FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ......... Cylinder-type electric double layer capacitor 3 ............... Wound bodies 4,5 ......... Disc-shaped current collector plate 6 ............... Strip-shaped positive electrode 7 ............... Strip-shaped negative electrode 8 , 9... Strip separators 10 and 11... Strip current collector foil 10 a... One end edge portion 11 a. 43 ………… Connecting member 45 ………… End plate (end wall)
50 ………… Opening 54 ………… Welding work hole 62 ………… Opening

Claims

帯状正極（６），帯状負極（７）およびそれらの一方を挟む２つの帯状セパレータ（８，９）よりなり，且つ前記帯状正極（６）における帯状集電箔（１０）の長手方向に沿う一端縁部（１０ａ）および前記帯状負極（７）における帯状集電箔（１１）の長手方向に沿う他端縁部（１１ａ）をそれぞれ前記両帯状セパレータ（８，９）の長手方向に沿う両端縁部から突出させた重合せ物を渦巻状に巻回した電極巻回体（３）と，前記両帯状集電箔（１０，１１）の長手方向に沿う一，他端縁部（１０ａ，１１ａ）の巻回による両接続部（１４，１５）にそれぞれレーザ溶接された２つの集電板（４，５）とを有する接合体（３９）を得るための治具であって，一端に開口部（５０）を，他端にレーザビームを照射するための溶接作業孔（５４）を持つ端壁（４５）をそれぞれ有する第１円筒体（４１）と，一端に，前記第１円筒体（４１）の開口部（５０）と合致する開口部（６２）を，他端にレーザビームを照射するための溶接作業孔（５４）を持つ端壁（４５）をそれぞれ有する第２円筒体（４２）と，前記第１，第２円筒体（４１，４２）の両開口部（５０，６２）を合致させて，それらの内部に入れられた前記電極巻回体（３）の一方の前記接続部（１４）に一方の前記集電板（４）を前記一方の端壁（４５）により加圧すると共に他方の前記接続部（１５）に他方の前記集電板（５）を前記他方の端壁（４５）により加圧した状態にて前記第１，第２円筒体（４１，４２）間を連結する連結部材（４３）と，連結状態にある前記第１，第２円筒体（４１，４２）間を電気的に絶縁する手段とを有することを特徴とする，円筒型電気二重層キャパシタにおける電極巻回体と集電板とのレーザ溶接用治具。One end of the strip-shaped positive electrode (6), the strip-shaped negative electrode (7), and two strip-shaped separators (8, 9) sandwiching one of them, and the strip-shaped positive electrode (6) along the longitudinal direction of the strip-shaped current collector foil (10) The other end edge (11a) along the longitudinal direction of the strip-shaped current collector foil (11) in the edge portion (10a) and the strip-shaped negative electrode (7), respectively, both end edges along the longitudinal direction of the strip-shaped separators (8, 9) And the other end edge (10a, 11a) along the longitudinal direction of the strip-shaped current collector foil (10, 11). ) Is a jig for obtaining a joined body (39) having two current collector plates (4, 5) each laser welded to both connection portions (14, 15) by winding of Part (50), welding work hole (54 for irradiating the other end with a laser beam) A first cylindrical body (41) each having an end wall (45) having an opening, an opening (62) matching the opening (50) of the first cylindrical body (41) at one end, and a laser at the other end. A second cylindrical body (42) having end walls (45) each having a welding work hole (54) for irradiating a beam, and both openings (50) of the first and second cylindrical bodies (41, 42). 62) and the one current collector plate (4) to the one end wall (45) to one of the connection portions (14) of the electrode winding body (3) placed inside them. ) And the first and second cylindrical bodies (41, 4) in a state where the other current collector plate (5) is pressurized to the other connecting portion (15) by the other end wall (45). 42) between the connecting member (43) connecting the two and the first and second cylindrical bodies (41, 42) in the connected state. And having a means for insulating, the cylindrical electric double electrode winding body in layer capacitor and laser welding jig with the current collector plate.