JP2002352789A - Secondary battery - Google Patents
Secondary batteryInfo
- Publication number
- JP2002352789A JP2002352789A JP2001155634A JP2001155634A JP2002352789A JP 2002352789 A JP2002352789 A JP 2002352789A JP 2001155634 A JP2001155634 A JP 2001155634A JP 2001155634 A JP2001155634 A JP 2001155634A JP 2002352789 A JP2002352789 A JP 2002352789A
- Authority
- JP
- Japan
- Prior art keywords
- battery
- current collector
- plate
- secondary battery
- welded
- 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.)
- Pending
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
- Y02E60/10—Energy storage using batteries
Landscapes
- Connection Of Batteries Or Terminals (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は二次電池に係り、特
に、開放端を有する金属製の電池缶内に、正負極及びセ
パレータを有する電極群と電解液とが収容され、前記開
放端が金属製の上蓋で封口された二次電池に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a secondary battery, and more particularly, to a metal battery can having an open end, in which an electrode group having positive and negative electrodes and a separator and an electrolytic solution are accommodated. The present invention relates to a secondary battery sealed with a metal top cover.
【０００２】[0002]
【従来の技術】近年、再充電可能な二次電池の分野で
は、鉛電池、ニッケル−カドミウム電池、ニッケル−水
素電池等の水溶液系電池が主流であった。しかしなが
ら、電気機器の小型化、軽量化が進むにつれ、高エネル
ギー密度を有する二次電池が着目され、その研究、開発
及び商品化が急速に進められるに至っている。また、地
球温暖化や枯渇燃料の問題から、電気自動車やハイブリ
ッド電気自動車が各自動車メーカーで開発され、その電
源用により高容量の二次電池も求められている。2. Description of the Related Art In recent years, in the field of rechargeable secondary batteries, aqueous batteries such as lead batteries, nickel-cadmium batteries, nickel-hydrogen batteries and the like have become mainstream. However, as the size and weight of electric devices have been reduced, attention has been paid to secondary batteries having a high energy density, and research, development and commercialization thereof have been rapidly advanced. Also, due to global warming and depleted fuel problems, electric vehicles and hybrid electric vehicles have been developed by automakers, and higher capacity secondary batteries for power sources are also required.
【０００３】このような二次電池のうち、例えば円筒型
電池は、図２に示すように、上方に開放端を有する金属
製の円筒状有底電池缶２３内に、合成樹脂製で中空円筒
状捲回軸２４の周りに正極及び負極をセパレータを介し
て捲回した電極群２２が挿入されている。電極群２２の
下端には、正負極のいずれか一方（通常は負極）から導
出された集電タブが超音波溶接で接合され中央に電池缶
２３側に凸部が形成された集電板２５が固定されてい
る。集電板２５の凸部と電池缶２３の内底面とが接触し
た箇所は、電流が通電され電気抵抗により発生する熱で
接合する抵抗溶接によって固定されている。抵抗溶接で
接合するためには、接合箇所に電流を流す必要があるの
で、捲回軸２４内の捲回軸穴２１を利用して円柱状電極
棒２０を差し込み、電極棒２０の先端を集電板２５の凹
部に接触させて、接合箇所を電極棒２０と図示しない別
の電極とで挟み、電流を流している。[0003] Among such secondary batteries, for example, as shown in FIG. 2, a cylindrical battery is made of a synthetic resin hollow cylinder in a metal bottomed battery can 23 having an open end at the top. An electrode group 22 formed by winding a positive electrode and a negative electrode through a separator is inserted around a wound shaft 24. At the lower end of the electrode group 22, a current collecting tab 25 derived from one of the positive and negative electrodes (usually the negative electrode) is joined by ultrasonic welding, and a current collector plate 25 having a convex portion formed on the battery can 23 side in the center. Has been fixed. A portion where the convex portion of the current collector plate 25 contacts the inner bottom surface of the battery can 23 is fixed by resistance welding in which a current is supplied and joined by heat generated by electric resistance. In order to join by resistance welding, it is necessary to supply a current to the joining portion. Therefore, the cylindrical electrode rod 20 is inserted using the wound shaft hole 21 in the wound shaft 24, and the tip of the electrode rod 20 is collected. An electric current is passed by contacting the concave portion of the electric plate 25 to sandwich the joint between the electrode rod 20 and another electrode (not shown).
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上述し
た抵抗溶接では、電極棒２０を差し込むために電極群２
２に捲回軸穴２１が必要となる。円筒型二次電池の場合
は、捲回軸穴２１を利用できるが、角型二次電池の場合
は、中空円筒状捲回軸２４を使用せずに正負極をセパレ
ータを介して薄い平板状の捲回軸の周りに捲回して電極
群が作製されているので、電極棒２０を差し込むために
捲回軸穴を作製することは難しい。However, in the above-described resistance welding, the electrode group 2 is inserted to insert the electrode rod 20.
2, a wound shaft hole 21 is required. In the case of a cylindrical secondary battery, the wound shaft hole 21 can be used, but in the case of a rectangular secondary battery, the positive and negative electrodes are thin-plate-shaped through a separator without using the hollow cylindrical wound shaft 24. Since the electrode group is manufactured by being wound around the winding axis of the above, it is difficult to manufacture the wound shaft hole for inserting the electrode rod 20.
【０００５】また、電池の体積効率を向上させるため
に、電極群を押し潰し扁平状とする場合には、電極群は
密着しているので、電極棒２０を差し込むために捲回軸
穴を作製することは困難である。When the electrode group is crushed and flattened to improve the volumetric efficiency of the battery, a wound shaft hole is formed for inserting the electrode rod 20 because the electrode group is in close contact. It is difficult to do.
【０００６】本発明は、上記事案に鑑み、捲回軸穴が不
要で体積効率に優れた二次電池を提供することを課題と
する。SUMMARY OF THE INVENTION In view of the above proposal, an object of the present invention is to provide a secondary battery which does not require a wound shaft hole and has excellent volume efficiency.
【０００７】[0007]
【課題を解決するための手段】上記課題を解決するため
に、本発明は、開放端を有する金属製の電池缶内に、正
負極及びセパレータを有する電極群と電解液とが収容さ
れ、前記開放端が金属製の上蓋で封口された二次電池に
おいて、前記電極群の正負極のいずれか一方が集電板を
介して前記電池缶に、前記電池缶の外側からのレーザ溶
接で固定されていることを特徴とする。In order to solve the above-mentioned problems, the present invention is directed to a metal battery can having an open end, in which an electrode group having positive and negative electrodes and a separator and an electrolytic solution are accommodated. In a secondary battery whose open end is sealed with a metal top lid, one of the positive and negative electrodes of the electrode group is fixed to the battery can via a current collector plate by laser welding from outside the battery can. It is characterized by having.
【０００８】本発明では、電極群の正負極のいずれか一
方を集電板を介して電池缶に、電池缶外側からレーザ溶
接で固定することで、抵抗溶接で固定するときに必要で
あった電極群の捲回軸穴が不要となるので、捲回軸穴の
ない体積効率に優れた二次電池を提供することができ
る。In the present invention, one of the positive and negative electrodes of the electrode group is required to be fixed to the battery can via the current collector plate by laser welding from the outside of the battery can by resistance welding. Since a wound shaft hole of the electrode group is not required, a secondary battery having no wound shaft hole and excellent in volume efficiency can be provided.
【０００９】この場合に、電池缶の内底面に形成された
凸部と、正負極のいずれか一方から導出された集電タブ
が溶接された集電板の裏面と、をレーザ溶接するように
することで、平板状の集電板の裏面と凸部とを密着固定
させることができる。また、凸部を電池缶の底部を開放
端側に凸起させて形成することで、凸部の厚さを電池缶
の厚さと同一に形成できるので、電池缶外側から照射さ
れるレーザを効率よく利用することができる。In this case, the convex portion formed on the inner bottom surface of the battery can and the back surface of the current collecting plate to which the current collecting tab led out from one of the positive and negative electrodes is welded by laser welding. By doing so, the back surface of the flat current collector plate and the convex portion can be closely fixed. In addition, by forming the convex portion so that the bottom of the battery can projects to the open end side, the thickness of the convex portion can be formed to be the same as the thickness of the battery can. Can be used well.
【００１０】[0010]
【発明の実施の形態】以下、図面を参照して、本発明を
ハイブリッド電気自動車（ＨＥＶ）に搭載される角型リ
チウム二次電池に適用した実施の形態について説明す
る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a prismatic lithium secondary battery mounted on a hybrid electric vehicle (HEV) will be described below with reference to the drawings.
【００１１】図１（Ａ）（Ｂ）に示すように、本実施形
態の角型リチウム二次電池１０は、上方に開放端を有す
る金属製の角型電池缶８内に、平板状捲回軸７の周りに
正負極をセパレータを介して樹脂製の捲回板７の廻りに
捲回した電極群９が挿入されている。電池缶８は、厚さ
０．５ｍｍのニッケルメッキ鋼板をレーザ溶接すること
で箱状に組み立てられ、内底面中央部には絞り加工によ
り略円形状の凸部８ａが開放端側に凸起するように形成
されている。このため、凸部８ａの電池缶８の外底面は
凸部８ａに対応して凹部が形成されている。この凸部８
ａの上面は平面状で、高さは電池缶８のニッケルメッキ
鋼板の厚さとほぼ同程度、幅は電池缶８の長手方向の幅
の５分の１程度、長さは電池缶８の厚さのほぼ２分の１
程度とされている。As shown in FIGS. 1 (A) and 1 (B), a rectangular lithium secondary battery 10 of the present embodiment is provided in a metal rectangular battery can 8 having an open end at the top, in a flat rolled shape. An electrode group 9 in which positive and negative electrodes are wound around a resin wound plate 7 via a separator is inserted around the shaft 7. The battery can 8 is assembled into a box shape by laser welding a nickel-plated steel plate having a thickness of 0.5 mm, and a substantially circular convex portion 8a protrudes toward the open end by drawing at the center of the inner bottom surface. It is formed as follows. Therefore, a concave portion is formed on the outer bottom surface of the battery can 8 corresponding to the convex portion 8a. This convex part 8
The upper surface of a is flat, the height is almost the same as the thickness of the nickel-plated steel plate of the battery can 8, the width is about one fifth of the longitudinal width of the battery can 8, and the length is the thickness of the battery can 8. Almost half
Degree.
【００１２】正極は、平均粒径が１０μｍのマンガン酸
リチウム（ＬｉＭｎ２Ｏ４）に、平均粒径が３μｍの炭
素粉末と、結着剤としてポリフッ化ビリニデンとを添加
し、溶媒のＮメチル２ピロリドンに分散させて製作した
スラリを、厚さ２０μｍのアルミニウム箔両面に塗布
し、乾燥させた後、プレスして一体化し、裁断して得ら
れたものである。正極は、塗布部の幅が９４ｍｍになる
ように一側が切断されており、他側は矩形状に切り欠か
れて正極集電タブ５が形成されている。The positive electrode is prepared by adding a carbon powder having an average particle size of 3 μm and polyvinylidene fluoride as a binder to lithium manganate (LiMn 2 O 4 ) having an average particle size of 10 μm, A slurry prepared by dispersing in pyrrolidone was applied to both sides of a 20-μm-thick aluminum foil, dried, pressed, integrated, and cut. The positive electrode is cut on one side so that the width of the coating portion is 94 mm, and the other side is cut out in a rectangular shape to form a positive electrode current collecting tab 5.
【００１３】負極は、平均粒径が２０μｍの炭素粒子
に、結着剤としてポリフッ化ビニリデンを添加し、溶媒
であるＮメチル２ピロリドンに分散させて製作したスラ
リを、厚さが１０μｍの銅箔両面に塗布し、乾燥させた
後、プレスして一体化し、裁断して得られたものであ
る。負極は、塗布部の幅が９４．５ｍｍになるように一
側が切断されており、他側は矩形状に切り欠かれて負極
集電タブ６が形成されている。The negative electrode is a slurry prepared by adding polyvinylidene fluoride as a binder to carbon particles having an average particle diameter of 20 μm and dispersing the resultant in N-methyl-2-pyrrolidone as a solvent. It is obtained by applying to both sides, drying, pressing, integrating and cutting. The negative electrode is cut on one side so that the width of the application portion is 94.5 mm, and is cut off in a rectangular shape on the other side to form a negative electrode current collecting tab 6.
【００１４】正極及び負極の接触を防止するセパレータ
には、リチウムイオンの通過を許容する厚さ２５μｍ、
幅１００ｍｍのポリエチレン製微多孔膜が用いられてい
る。The separator for preventing the contact between the positive electrode and the negative electrode has a thickness of 25 μm allowing passage of lithium ions,
A polyethylene microporous membrane having a width of 100 mm is used.
【００１５】捲回板７は、厚さ２ｍｍ、幅６０ｍｍ、高
さ１０５ｍｍのポリプロピレン製で、下端が矩形平板状
でニッケル製の負極集電板２の中央部に垂直方向に溶着
されている。負極集電板２の上面には、負極集電タブ６
がまとめられて超音波溶接されている。なお、負極集電
板２の凸部８ａに接合される部分の裏面部分は、負極集
電タブ６が超音波溶接されておらず、負極集電タブ６自
体が切り取られた平面状である。凸部８ａと負極集電板
２とは、凸部８ａに負極集電板２が押しつけられる状態
で電池缶８の底面外側からＹＡＧレーザで溶接されてい
る。ＹＡＧレーザには焦点距離１６０ｍｍのレンズを使
用し、１５Ｈｚ、１７０Ｗの出力により、送り速さ４ｍ
ｍ／秒で、長さ５ｍｍの３筋が接合部に形成されてい
る。The wound plate 7 is made of polypropylene having a thickness of 2 mm, a width of 60 mm and a height of 105 mm, and is vertically welded to a central portion of a nickel negative electrode current collector plate 2 having a rectangular flat plate at a lower end. On the upper surface of the negative electrode current collector plate 2, a negative electrode current collector tab 6 is provided.
Are ultrasonically welded together. In addition, the back surface part of the part joined to the convex part 8a of the negative electrode current collector plate 2 has a flat shape in which the negative electrode current collector tab 6 itself is cut off without ultrasonic welding of the negative electrode current collector tab 6. The convex portion 8a and the negative electrode current collector plate 2 are welded with a YAG laser from the outside of the bottom surface of the battery can 8 in a state where the negative electrode current collector plate 2 is pressed against the convex portion 8a. The YAG laser uses a lens with a focal length of 160 mm, and outputs 15 Hz and 170 W with a feed speed of 4 m.
At 5 m / sec, three streaks with a length of 5 mm are formed at the joint.
【００１６】一方、捲回板７の上端は、矩形平板状でア
ルミニウム製の正極集電板１の中央部に垂直に溶着され
ている。正極集電板１の下面には、正極集電タブ５がま
とめられて超音波溶接されている。また、正極集電板１
の上面中央部には、アルミニウム製平板が略く字状に折
り曲げられた正極リード片１４の一端が溶接されてい
る。On the other hand, the upper end of the winding plate 7 is vertically welded to the center of the positive electrode current collector plate 1 made of a rectangular flat plate and made of aluminum. On the lower surface of the positive electrode current collecting plate 1, a positive electrode current collecting tab 5 is put together and ultrasonically welded. In addition, the positive electrode current collector plate 1
One end of a positive electrode lead piece 14 in which a flat aluminum plate is bent in a substantially rectangular shape is welded to a central portion of the upper surface.
【００１７】鉄にニッケルメッキが施された平板状の上
蓋板１５の中央部には、正極端子用の円形孔が形成され
ている。この円形孔には、正極リード片１４との接続用
で鉄にニッケルメッキが施された環状受け板１３及び中
空リベット１１と上蓋板１５とを絶縁するパッキン１２
を介して中空リべット１１がカシメられている。中空リ
べット１１の頭部に当接載置されたＥＰＤＭ製ゴム弁１
６が、圧縮されて断面ハット状の正極端子キャップ１７
で覆われており、正極端子キャップ１７の鍔部と中空リ
べット１１の頭部とが抵抗溶接されて正極端子が作製さ
れている。中空リべット１１の下端と受け板１３とは中
空リベット１１のカシメ後に抵抗溶接されており、正極
リード板１４の他端は、受け板１３の底面に抵抗溶接さ
れ電気抵抗が下げられている。また、上蓋板１５にはね
じ栓１８が螺着される注液口が形成されている。上蓋板
１５の外周部には板決用段差が形成されており、電池缶
８側に落とし込んだ電池缶８の側面からレーザ溶接する
ことで封口されている。なお、電池缶８内には図示しな
い非水電解液が所定量注入されて、角型リチウム二次電
池１０が作製されている。A circular hole for a positive electrode terminal is formed in the center of a flat upper cover plate 15 in which nickel is plated on iron. The circular hole has an annular receiving plate 13 made of nickel-plated iron and a packing 12 for insulating the hollow rivet 11 from the upper lid plate 15 for connection with the positive electrode lead piece 14.
The hollow rivet 11 is caulked through. EPDM rubber valve 1 mounted on the head of hollow rivet 11
6 is a compressed positive electrode terminal cap 17 having a hat-shaped cross section.
The flange of the positive electrode terminal cap 17 and the head of the hollow rivet 11 are resistance-welded to produce a positive electrode terminal. The lower end of the hollow rivet 11 and the receiving plate 13 are resistance-welded after the caulking of the hollow rivet 11, and the other end of the positive electrode lead plate 14 is resistance-welded to the bottom surface of the receiving plate 13 to reduce the electric resistance. I have. A liquid inlet for screwing a screw plug 18 is formed in the upper cover plate 15. A plate step is formed on the outer peripheral portion of the upper lid plate 15, and is closed by laser welding from the side surface of the battery can 8 dropped to the battery can 8 side. A predetermined amount of a non-aqueous electrolyte (not shown) is injected into the battery can 8 to produce a prismatic lithium secondary battery 10.
【００１８】本実施形態では、電池缶８の底面外側から
レーザ溶接により、負極集電板２と凸部８ａとが接合さ
れているので、電極群９に捲回軸穴が不要となり、体積
効率の優れた二次電池を得ることができる。特に、薄型
で体積効率の向上を目的とした電池の電池缶８の底面の
溶接に好適である。凸部８ａの高さは電池缶８のニッケ
ルメッキ鋼板の厚さとほぼ同程度であるので、電池の体
積効率向上のために効果的である。In this embodiment, since the negative electrode current collector plate 2 and the projection 8a are joined by laser welding from the outside of the bottom surface of the battery can 8, the electrode group 9 does not need to have a wound shaft hole, and the volume efficiency is reduced. And a secondary battery excellent in the above can be obtained. In particular, it is suitable for welding the bottom surface of a battery can 8 of a thin battery for the purpose of improving volumetric efficiency. Since the height of the protrusion 8a is substantially the same as the thickness of the nickel-plated steel plate of the battery can 8, it is effective for improving the volumetric efficiency of the battery.
【００１９】また、本実施形態では、電池缶８の内底面
中央部に、凸部８ａが形成されており、凸部８ａの上面
は平面状であるため、凸部８ａの上面に負極集電板２が
押しつけられた状態でレーザ溶接するときに、凸部８ａ
の上面と、負極集電タブ６が超音波溶接された負極集電
板２の裏面と、を密着固定させることができる。なお、
負極集電板２の凸部８ａに接合される表面部分に負極集
電タブ６が溶接されていないので、超音波溶接時に溶接
治具のパターンが負極集電板２に転写されることによる
負極集電板２と凸部８ａとのレーザ溶接不良を防止する
ことができる。In the present embodiment, the convex portion 8a is formed at the center of the inner bottom surface of the battery can 8, and since the upper surface of the convex portion 8a is flat, the negative electrode current collector is formed on the upper surface of the convex portion 8a. When laser welding is performed with the plate 2 pressed, the projections 8a
And the back surface of the negative electrode current collector plate 2 to which the negative electrode current collector tab 6 is ultrasonically welded, can be closely fixed. In addition,
Since the negative electrode current collecting tab 6 is not welded to the surface portion of the negative electrode current collecting plate 2 that is joined to the projection 8a, the pattern of the welding jig is transferred to the negative electrode current collecting plate 2 during ultrasonic welding. Laser welding failure between the current collector plate 2 and the projection 8a can be prevented.
【００２０】更に、本実施形態では、絞り加工で電池缶
８の内底面中央部に凸部８ａが開放端側に凸起するよう
に形成したことから、凸部８ａの厚さを電池缶８の厚さ
と同じくすることができるので、電池缶８の底面外側か
らレーザ溶接するとき、レーザを効率よく照射すること
ができる。Further, in this embodiment, since the convex portion 8a is formed at the center of the inner bottom surface of the battery can 8 by drawing so as to protrude toward the open end, the thickness of the convex portion 8a is reduced. Therefore, when performing laser welding from the outside of the bottom surface of the battery can 8, the laser can be efficiently irradiated.
【００２１】なお、本実施形態では、電池缶８の内底面
中央部に１箇所円形状の凸部８ａを形成した例を示した
が、凸部８ａの箇所数や形状はこれに限定されるもので
はなく、複数箇所に凸部を形成したり略矩形状の凸部を
するようにしてもよい。In this embodiment, an example is shown in which one circular convex portion 8a is formed at the center of the inner bottom surface of the battery can 8, but the number and shape of the convex portions 8a are not limited to this. Instead, a convex portion may be formed at a plurality of locations or a substantially rectangular convex portion may be formed.
【００２２】また、本実施形態では、凸部８ａに負極集
電板２をレーザ溶接するときに、ＹＡＧレーザを使用し
た例を示したが、レーザの種類はこれに限定されるもの
ではなく、炭酸ガスレーザやエキシマレーザ等の種々の
レーザを使用することができる。また、ＹＡＧレーザに
好適な振動数、送り速さ、レーザ溶接の長さ、レーザ溶
接の筋数及び筋形状を示したが、これらの数値又は形状
に限定されるものではなく、使用するレーザに応じて変
更するようにすればよい。また、レーザ溶接の筋形状も
折れ線状や曲線状などにしてもよい。Further, in the present embodiment, an example has been shown in which the YAG laser is used when the negative electrode current collector 2 is laser-welded to the projection 8a, but the type of laser is not limited to this. Various lasers such as a carbon dioxide laser and an excimer laser can be used. In addition, the preferred frequency, feed rate, laser welding length, number of laser welding streaks and streak shape for the YAG laser are shown, but the present invention is not limited to these numerical values or shapes, and the laser used is What is necessary is just to change according to it. The streak shape of the laser welding may also be a broken line shape or a curved shape.
【００２３】[0023]
【発明の効果】以上説明したように、本発明によれば、
電極群の正負極のいずれか一方を集電板を介して電池缶
に、電池缶外側からレーザ溶接により固定することで、
抵抗溶接で固定するときに必要であった電極群の捲回軸
穴が不要となるので、捲回軸穴のない体積効率に優れた
二次電池を提供できる、という効果を得ることができ
る。As described above, according to the present invention,
By fixing one of the positive and negative electrodes of the electrode group to the battery can via the current collector plate by laser welding from the outside of the battery can,
Since the wound shaft hole of the electrode group, which was necessary when fixing by resistance welding, is not required, it is possible to obtain an effect that a secondary battery having no wound shaft hole and excellent in volume efficiency can be provided.
【図面の簡単な説明】[Brief description of the drawings]
【図１】本発明が適用可能な実施形態の角型リチウム二
次電池の断面図であり、（Ａ）は正面図、（Ｂ）は側面
図である。FIG. 1 is a cross-sectional view of a prismatic lithium secondary battery according to an embodiment to which the present invention can be applied, (A) is a front view, and (B) is a side view.
【図２】従来の電極棒を用いた電池缶底の溶接を示す断
面図である。FIG. 2 is a cross-sectional view showing welding of a battery can bottom using a conventional electrode rod.
１ 正極集電板 ２ 負極集電板（集電板） ６ 負極集電タブ（集電タブ） ８ 電池缶 ８ａ 凸部 ９ 電極群 １０ 角型リチウム二次電池（二次電池） １５ 上蓋板（上蓋） DESCRIPTION OF SYMBOLS 1 Positive electrode current collector 2 Negative electrode current collector (current collector) 6 Negative electrode current collector tab (current collector tab) 8 Battery can 8a Convex part 9 Electrode group 10 Square lithium secondary battery (secondary battery) 15 Top cover plate (Top lid)
Claims (3)
負極及びセパレータを有する電極群と電解液とが収容さ
れ、前記開放端が金属製の上蓋で封口された二次電池に
おいて、前記電極群の正負極のいずれか一方が集電板を
介して前記電池缶に、前記電池缶の外側からのレーザ溶
接で固定されていることを特徴とする二次電池。1. A secondary battery in which an electrode group having positive and negative electrodes and a separator and an electrolytic solution are accommodated in a metal battery can having an open end, and wherein the open end is sealed with a metal upper lid. A secondary battery, wherein one of the positive and negative electrodes of the electrode group is fixed to the battery can via a current collector plate by laser welding from outside the battery can.
から導出された集電タブが溶接されており、前記電池缶
の内底面に形成された凸部と前記集電タブが溶接された
集電板の裏面とがレーザ溶接されていることを特徴とす
る請求項１に記載の二次電池。2. The current collecting plate is welded with a current collecting tab derived from one of the positive and negative electrodes, and a projection formed on an inner bottom surface of the battery can is welded to the current collecting tab. The secondary battery according to claim 1, wherein the back surface of the current collector plate is laser-welded.
端側に凸起させて形成されていることを特徴とする請求
項１又は請求項２に記載の二次電池。3. The secondary battery according to claim 1, wherein the projection is formed by projecting a bottom of the battery can toward the open end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001155634A JP2002352789A (en) | 2001-05-24 | 2001-05-24 | Secondary battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001155634A JP2002352789A (en) | 2001-05-24 | 2001-05-24 | Secondary battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002352789A true JP2002352789A (en) | 2002-12-06 |
Family
ID=18999781
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001155634A Pending JP2002352789A (en) | 2001-05-24 | 2001-05-24 | Secondary battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002352789A (en) |
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|---|---|---|---|---|
| JP2010146872A (en) * | 2008-12-19 | 2010-07-01 | Hitachi Vehicle Energy Ltd | Flat secondary battery |
| JP2012530337A (en) * | 2009-06-18 | 2012-11-29 | ヴァルタ マイクロバッテリー ゲゼルシャフト ミット ベシュレンクテル ハフツング | Button battery with wound electrode and method for manufacturing the same |
| US8703327B2 (en) | 2008-06-20 | 2014-04-22 | Samsung Sdi Co., Ltd. | Rechargeable battery and manufacturing method thereof |
| US8795865B2 (en) | 2008-03-31 | 2014-08-05 | Samsung Sdi Co., Ltd. | Battery pack |
| US9065083B2 (en) | 2008-06-03 | 2015-06-23 | Samsung Sdi Co., Ltd. | Lithium polymer battery |
| WO2015129154A1 (en) * | 2014-02-27 | 2015-09-03 | 三洋電機株式会社 | Battery and production method for battery |
| US9153835B2 (en) | 2009-02-09 | 2015-10-06 | Varta Microbattery Gmbh | Button cells and method for producing same |
| WO2022209172A1 (en) | 2021-03-31 | 2022-10-06 | パナソニックＩｐマネジメント株式会社 | Electrode for secondary battery, secondary battery, and method for manufacturing electrode for secondary battery |
| WO2022209112A1 (en) | 2021-03-31 | 2022-10-06 | パナソニックＩｐマネジメント株式会社 | Secondary battery electrode, secondary battery, and method for producing secondary battery electrode |
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| JP2000077040A (en) * | 1998-08-31 | 2000-03-14 | Sanyo Electric Co Ltd | Battery |
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2001
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| JP2000077040A (en) * | 1998-08-31 | 2000-03-14 | Sanyo Electric Co Ltd | Battery |
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| US9065083B2 (en) | 2008-06-03 | 2015-06-23 | Samsung Sdi Co., Ltd. | Lithium polymer battery |
| US8703327B2 (en) | 2008-06-20 | 2014-04-22 | Samsung Sdi Co., Ltd. | Rechargeable battery and manufacturing method thereof |
| JP2010146872A (en) * | 2008-12-19 | 2010-07-01 | Hitachi Vehicle Energy Ltd | Flat secondary battery |
| US11258092B2 (en) | 2009-02-09 | 2022-02-22 | Varta Microbattery Gmbh | Button cells and method of producing same |
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