JP2002198011A - Square-shaped nonaqueous electrolyte secondary cell - Google Patents
Square-shaped nonaqueous electrolyte secondary cellInfo
- Publication number
- JP2002198011A JP2002198011A JP2000396431A JP2000396431A JP2002198011A JP 2002198011 A JP2002198011 A JP 2002198011A JP 2000396431 A JP2000396431 A JP 2000396431A JP 2000396431 A JP2000396431 A JP 2000396431A JP 2002198011 A JP2002198011 A JP 2002198011A
- Authority
- JP
- Japan
- Prior art keywords
- battery
- stainless steel
- rectangular
- battery container
- steel plate
- 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.)
- Abandoned
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
- Sealing Battery Cases Or Jackets (AREA)
- Secondary Cells (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、角型非水電解液二
次電池に係り、特に、直方体状で蓋を取り付けるための
一面が開口した角型電池容器を有する角型非水電解液二
次電池に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rectangular non-aqueous electrolyte secondary battery, and more particularly to a rectangular non-aqueous electrolyte secondary battery having a rectangular battery container having a rectangular parallelepiped shape and one open side for attaching a lid. Next battery.
【０００２】[0002]
【従来の技術】従来、角型非水電解液二次電池の電池容
器は、密閉性を確保する必要から、ステンレス等の金属
部材を深絞り加工などの一体成形を行うことにより作製
されている。例えば、特開平第１０−２４１６５１号公
報には、一体成形された角形の電池容器とこの電池容器
の開口部を封口する蓋とをレーザ溶接して密閉性を確保
する技術が開示されている。2. Description of the Related Art Conventionally, a battery container of a rectangular nonaqueous electrolyte secondary battery has been manufactured by integrally forming a metal member such as stainless steel by deep drawing or the like because it is necessary to secure hermeticity. . For example, Japanese Unexamined Patent Publication No. 10-241651 discloses a technique for ensuring tightness by laser welding a rectangular battery container integrally formed and a lid for sealing an opening of the battery container.
【０００３】一方、非水電解液二次電池は、近時の電子
技術の革新や用途の多様化により、より高出力、高容量
の大型の非水電解液二次電池が要求されるようになって
きている。しかしながら、上述した金属の深絞り加工
は、密閉性の面で優れるものの、大型の角型電池容器を
作製する場合には大きさに加工限界があるため、比較的
小型の角型電池容器の加工のみに限られている。On the other hand, non-aqueous electrolyte secondary batteries have recently been required to have higher output, higher capacity and larger non-aqueous electrolyte secondary batteries due to recent innovations in electronic technology and diversification of applications. It has become to. However, although the above-described deep drawing of metal is excellent in terms of hermeticity, there is a processing limit in the case of producing a large rectangular battery container. Limited to only.
【０００４】[0004]
【発明が解決しようとする課題】従って、角型非水電解
液二次電池の大型化は困難であったが、電池容器が深絞
りの不可能な大きさ・形状であっても、金属板の折り曲
げ、貼り合わせ溶接で大型の角型電池容器を得ることが
できるなら、大型の角型非水電解液二次電池を実現する
ことが可能になる。ところが、従来、貼り合わせ溶接で
は、溶接部から非水電解液のリークが発生し、非水電解
液二次電池の密閉性を確保することが難しい、という問
題点があった。Therefore, it has been difficult to increase the size of the prismatic non-aqueous electrolyte secondary battery. However, even if the battery container has a size and shape that cannot be deep drawn, a metal plate is required. If a large-sized rectangular battery container can be obtained by bending and laminating, a large-sized rectangular non-aqueous electrolyte secondary battery can be realized. However, in the past, in the past welding, there was a problem that leakage of the nonaqueous electrolyte solution occurred from the welded portion, and it was difficult to secure the hermeticity of the nonaqueous electrolyte secondary battery.
【０００５】本発明は上記事案に鑑み、電池容器の溶接
箇所が少なく信頼性の高い大型の角型非水電解液二次電
池を提供することを課題とする。SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to provide a large-sized rectangular non-aqueous electrolyte secondary battery having a small number of welding portions of a battery container and high reliability.
【０００６】[0006]
【課題を解決するための手段】上記課題を解決するため
に、本発明の第１の態様は、直方体状で蓋を取り付ける
ための一面が開口した角型電池容器を有する角型非水電
解液二次電池において、前記電池容器は、１枚の板状金
属部材が折り曲げられ該金属部材の端部同士がレーザ溶
接で接合されていることを特徴とする。本態様によれ
ば、電池容器は１枚の板状金属部材が折り曲げられ金属
部材の端部同士がレーザ溶接で接合されているので、折
り曲げ箇所は接合の必要がなく接合箇所を少なくするこ
とができるため、接合部から非水電解液のリークを低減
させることができる。In order to solve the above problems, a first aspect of the present invention is to provide a rectangular non-aqueous electrolyte having a rectangular battery container having a rectangular parallelepiped shape and one open side for attaching a lid. In the secondary battery, the battery container is characterized in that one plate-shaped metal member is bent and ends of the metal member are joined by laser welding. According to this aspect, in the battery case, one plate-shaped metal member is bent and the ends of the metal members are joined by laser welding, so that the bent portion does not need to be joined and the number of joined portions can be reduced. Therefore, leakage of the non-aqueous electrolyte from the joint can be reduced.
【０００７】本発明の第２の態様は、直方体状で蓋を取
り付けるための一面が開口した角型電池容器を有する角
型非水電解液二次電池において、前記電池容器は、前記
直方体の２面を構成するように断面Ｌ字状に折り曲げら
れた第１の板状金属部材と、前記直方体の３面を構成す
るように断面コ字状に折り曲げられた第２の板状金属部
材と、が向かい合わされ前記第１及び第２の金属部材の
端部同士がレーザ溶接で接合されていることを特徴とす
る。本態様によれば、第１の態様と同様に、折り曲げ箇
所は接合の必要がなく接合箇所を少なくすることができ
るので、接合部から非水電解液のリークを低減させるこ
とができると共に、電池容器となる部材を第１の板状金
属部材と第２の板状金属部材とに分割したので、各板状
金属部材の折り曲げ加工が容易となり寸法精度を向上さ
せることができることから、接合部からのリークをより
低減させることができる。According to a second aspect of the present invention, there is provided a rectangular nonaqueous electrolyte secondary battery having a rectangular battery container having a rectangular parallelepiped shape and one side open for attaching a lid, wherein the battery container is a rectangular parallelepiped. A first plate-shaped metal member bent into an L-shaped cross section to form a surface, a second plate-shaped metal member bent into a U-shaped cross section to form three surfaces of the rectangular parallelepiped, And the end portions of the first and second metal members are joined by laser welding. According to this aspect, similarly to the first aspect, since the bent portion does not need to be joined and the number of joined portions can be reduced, the leakage of the non-aqueous electrolyte from the joined portion can be reduced, and the battery can be reduced. Since the member serving as the container is divided into the first plate-shaped metal member and the second plate-shaped metal member, the bending process of each plate-shaped metal member is facilitated, and the dimensional accuracy can be improved. Can be further reduced.
【０００８】上記態様において、蓋を取り付けるための
一面を、直方体を構成する各辺のうち最も長い辺を含む
面とすれば、リークの原因となる接合部の長さを短くす
ることができるので、接合部からのリークの防止に対し
て一層信頼性を高めることができる。In the above aspect, if one surface for attaching the lid is a surface including the longest side among the sides constituting the rectangular parallelepiped, the length of the joint that causes a leak can be shortened. In addition, reliability can be further improved with respect to prevention of leakage from the junction.
【０００９】[0009]
【発明の実施の形態】以下、図面を参照して、本発明を
大型の角型リチウムイオン二次電池に適用した第１の実
施の形態について説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment in which the present invention is applied to a large-sized rectangular lithium ion secondary battery will be described below with reference to the drawings.
【００１０】図１に示すように、本実施形態の角型リチ
ウムイオン二次電池２０は、角型でＳＵＳ３０４製の電
池容器８を備えている。電池容器８の中央部には、矩形
状で上部方向に耳部が張り出した正極板及び負極板を複
数枚セパレータを介して積層した電極群１２が収容され
ている。正極板は、厚さ２０μｍのアルミニウム箔を正
極集電体とし、正極集電体両面に正極活物質合剤が塗布
されている。一方、負極板は、厚さ１０μｍの銅箔を負
極集電体とし、負極集電体両面に負極活物質合剤が塗布
されている。また、角型リチウムイオン二次電池２０
は、ＳＵＳ３０４製の電池蓋９を備えており、電極群１
２を電池容器８に挿入した後、電池容器８の開口部周縁
とこの電池蓋９の周縁とをレーザ溶接することで封止さ
れている。As shown in FIG. 1, a prismatic lithium ion secondary battery 20 according to the present embodiment includes a rectangular battery container 8 made of SUS304. An electrode group 12 in which a plurality of positive and negative electrode plates, each of which has a rectangular shape and has a protruding ear portion in the upper direction, is laminated via a separator in the center of the battery container 8. The positive electrode plate has a 20 μm-thick aluminum foil as a positive electrode current collector, and a positive electrode active material mixture is applied to both surfaces of the positive electrode current collector. On the other hand, in the negative electrode plate, a copper foil having a thickness of 10 μm is used as a negative electrode current collector, and a negative electrode active material mixture is applied to both surfaces of the negative electrode current collector. The prismatic lithium ion secondary battery 20
Is provided with a battery cover 9 made of SUS304, and the electrode group 1
After the battery 2 is inserted into the battery case 8, the periphery of the opening of the battery case 8 and the periphery of the battery cover 9 are sealed by laser welding.
【００１１】電池蓋９には、アルミニウム製で上部側に
ネジが螺設された正極端子３１及び銅製で上部側にネジ
が螺設された負極端子３２が固定されている。正極端子
３１、負極端子３２は、それぞれ、電池蓋９との間に介
在する薄い円環状の下パッキン２１、電池蓋９に当接す
る薄い円環状の上パッキン２２、上パッキン２２に当接
する平ワッシャ２３、平ワッシャ２３に当接する歯付き
ワッシャ２４を介してナット２５で締め付けられてお
り、上パッキン２２及び下パッキン２１の介在により正
負極端子部の密閉・封止状態が確保されている。正極板
の集電体耳部３３及び負極板の集電体耳部３４は、それ
ぞれ超音波溶接により、正極端子３１及び負極端子３２
の下部に接合されており、正極板は正極端子３１に、負
極板は負極端子３２に導通されている。A positive electrode terminal 31 made of aluminum and screwed on the upper side and a negative electrode terminal 32 made of copper and screwed on the upper side are fixed to the battery cover 9. The positive electrode terminal 31 and the negative electrode terminal 32 are a thin annular lower packing 21 interposed between the battery lid 9, a thin annular upper packing 22 abutting the battery lid 9, and a flat washer abutting the upper packing 22. 23, are fastened with nuts 25 via toothed washers 24 that come into contact with the flat washers 23. The sealing of the positive and negative electrode terminals is ensured by the interposition of the upper packing 22 and the lower packing 21. The current collector ears 33 of the positive electrode plate and the current collector ears 34 of the negative electrode plate are respectively connected to the positive electrode terminal 31 and the negative electrode terminal 32 by ultrasonic welding.
The positive electrode plate is electrically connected to the positive electrode terminal 31, and the negative electrode plate is electrically connected to the negative electrode terminal 32.
【００１２】また、電池蓋９にはステンレス箔を溶接し
た安全弁１０及び注液口が配設されている。安全弁１０
は、電池内圧上昇時にこのステンレス箔が破断して内部
のガスを放出する機能を有している。注液口からは、エ
チレンカーボネートとジメチルカーボネートとの混合溶
媒に６フッ化リン酸リチウム（ＬｉＰＦ６）を溶解した
図示しない非水電解液が注液されており、電解液注入
後、液口栓１１により注液口は密閉されている。The battery lid 9 is provided with a safety valve 10 made of stainless steel foil and a liquid inlet. Safety valve 10
Has a function of breaking the stainless steel foil and releasing the gas inside when the battery internal pressure rises. A non-aqueous electrolyte (not shown) in which lithium hexafluorophosphate (LiPF 6 ) is dissolved in a mixed solvent of ethylene carbonate and dimethyl carbonate is injected from the injection port. The injection port is closed by 11.
【００１３】次に、大型の角型リチウムイオン二次電池
２０に使用可能な電池容器８について、電池容器Ａ、電
池容器Ｂの２つの作製手順を説明する。なお、本実施形
態の角型リチウムイオン二次電池２０には、電池容器８
として電池容器Ａ、Ｂのいずれの使用も可能である。Next, with respect to the battery container 8 which can be used for the large rectangular lithium ion secondary battery 20, two procedures for manufacturing the battery container A and the battery container B will be described. The prismatic lithium ion secondary battery 20 of the present embodiment includes a battery container 8.
Any of the battery containers A and B can be used.
【００１４】＜電池容器Ａ＞図２（Ａ）に示すように、
まず、１枚のＳＵＳ３０４製のステンレス板を略Ｔ字状
の板４として切り出す。なお、図２において、Ｘは電池
容器Ａの幅方向の辺（図１に示した電池容器８の長手方
向の辺）、Ｙは電池容器Ａの長さ方向の辺、Ｚは電池容
器Ａの高さ方向の辺を表しており、各辺間は、Ｘ＞Ｚ＞
Ｙの関係を有している（以下、図３、４においても同
じ。）。次に、図２（Ｂ）に示すように、板４を直方体
状の容器になるように直角に折り曲げ加工を施す。そし
て、図２（Ｃ）に示すように、板４の端部同士をレーザ
溶接して接合する。このとき、溶接部の長さが短くなる
ように、板４の各辺のうち最も長い辺Ｘを除く、辺Ｚ及
び辺Ｙの各２辺（合計４辺）がレーザ溶接で接合される
（接合長さ＝２×（Ｙ＋Ｚ））。従って、電池容器Ａの
最も長い辺Ｘ及び最も短い辺Ｙの各２辺は、上述した電
池蓋９とレーザ溶接される開口部として未溶接のままと
されている。<Battery container A> As shown in FIG.
First, one stainless steel plate made of SUS304 is cut out as a substantially T-shaped plate 4. In FIG. 2, X is a side in the width direction of the battery container A (a side in the longitudinal direction of the battery container 8 shown in FIG. 1), Y is a side in the length direction of the battery container A, and Z is a side of the battery container A. Represents sides in the height direction, and between each side, X>Z>
Y (the same applies to FIGS. 3 and 4). Next, as shown in FIG. 2B, the plate 4 is bent at a right angle so as to form a rectangular parallelepiped container. Then, as shown in FIG. 2C, the ends of the plates 4 are joined by laser welding. At this time, two sides Z (sides) and Y (excluding the longest side X) of the sides of the plate 4 are joined by laser welding so that the length of the welded portion is shortened (total four sides) ( (Joint length = 2 × (Y + Z)). Therefore, the two sides of the longest side X and the shortest side Y of the battery container A are left unwelded as openings to be laser-welded to the battery lid 9 described above.
【００１５】＜電池容器Ｂ＞図３（Ａ）に示すように、
ＳＵＳ３０４製のステンレス板１を断面Ｌ字状となるよ
うに直角に折り曲げる。また、ＳＵＳ３０４製のステン
レス板２を断面コ字状となるように直角に折り曲げる。
次に、図３（Ｂ）に示すように、ステンレス板１及びス
テンレス板２を向かい合わせ、図３（Ｃ）に示すよう
に、ステンレス板１とステンレス板２との端部同士をレ
ーザ溶接して接合する。このとき、辺Ｘの一辺、辺Ｚ及
び辺Ｙの各２辺（合計５辺）がレーザ溶接で接合される
（接合長さ＝Ｘ＋２×（Ｙ＋Ｚ））。なお、電池容器Ａ
と同様に、電池容器Ｂの最も長い辺Ｘ及び最も短い辺Ｙ
の各２辺は、上述した電池蓋９とレーザ溶接される開口
部として未溶接のままとされている。<Battery container B> As shown in FIG.
A stainless steel plate 1 made of SUS304 is bent at a right angle so as to have an L-shaped cross section. Also, the stainless steel plate 2 made of SUS304 is bent at a right angle so as to have a U-shaped cross section.
Next, as shown in FIG. 3 (B), the stainless steel plate 1 and the stainless steel plate 2 face each other, and as shown in FIG. 3 (C), the ends of the stainless steel plate 1 and the stainless steel plate 2 are laser-welded. To join. At this time, one side of the side X, two sides of the side Z and the side Y (total of five sides) are joined by laser welding (joining length = X + 2 × (Y + Z)). The battery container A
Similarly, the longest side X and the shortest side Y of the battery case B
Are left unwelded as openings for laser welding with the battery lid 9 described above.
【００１６】（試験）次に、上記実施形態に従って試験
用に作製した電池容器Ａ、Ｂについて詳述する。また、
比較のために作製した電池容器Ｃについても併記する。
なお、試験用に作製した電池容器Ａ、Ｂ、Ｃは、いずれ
も各辺の長さＸ、Ｙ、Ｚをそれぞれ、１５９ｍｍ、４０
ｍｍ、１４６ｍｍとした。また、材料となるステンレス
板は、厚さｔ＝１ｍｍのものを使用した。(Test) Next, the battery containers A and B manufactured for the test according to the above embodiment will be described in detail. Also,
The battery container C prepared for comparison is also described.
In addition, each of the battery containers A, B, and C manufactured for the test had the length X, Y, and Z of each side of 159 mm, 40 mm, respectively.
mm and 146 mm. Further, a stainless plate having a thickness t = 1 mm was used as a material.
【００１７】＜試験用電池容器の作製＞上述した電池容
器Ａ及び電池容器Ｂをそれぞれ１００個作製した。ま
た、図４に示すように、電池容器Ｂを作製する場合と同
様の断面コ字状に折り曲げられたステンレス板２と、平
板でＳＵＳ３０４製の辺Ｘ＝１５９ｍｍ、辺Ｚ＝１４６
ｍｍのステンレス板６と、平板でＳＵＳ３０４製の辺Ｘ
＝１５９ｍｍ、辺Ｙ＝４０ｍｍのステンレス板７と、を
それぞれの端面を接合して電池容器Ｃとし、この電池容
器Ｃを１００個作製した。<Preparation of Battery Container for Test> 100 battery containers A and B were prepared respectively. Further, as shown in FIG. 4, a stainless steel plate 2 bent in a U-shaped cross section as in the case of manufacturing the battery container B, a flat plate made of SUS304 and having a side X = 159 mm and a side Z = 146.
mm stainless steel plate 6 and SUS304 side plate X
= 159 mm and a stainless steel plate 7 with a side Y of 40 mm were joined at their respective end faces to form a battery container C, and 100 battery containers C were produced.
【００１８】＜試験内容及び試験結果＞次に、これらの
電池容器Ａ、Ｂ、Ｃについて、電池容器から漏れが生じ
ないかをチェックするリーク試験を行った。このリーク
試験では、各電池容器に変形防止用のダミーを入れ、バ
ルブを有する電池蓋を電池容器の開口部周縁にレーザ溶
接してバルブをＨｅ検出器につなぎ、電池容器内を真空
に引いた後にＨｅガスを溶接部に吹きかけ、電池容器内
の真空度が１０―７Ｔｏｒｒより大きくならないとき、
リークしていない（＝良品）と判断した。リーク試験の
試験結果を図５に示す。<Test Contents and Test Results> Next, a leak test was performed on these battery containers A, B, and C to check whether or not leakage occurred from the battery containers. In this leak test, a dummy for preventing deformation was placed in each battery container, a battery lid having a valve was laser-welded to the periphery of the opening of the battery container, the valve was connected to a He detector, and the inside of the battery container was evacuated. Later, He gas is sprayed on the weld, and when the degree of vacuum in the battery container does not become larger than 10 −7 Torr,
It was determined that there was no leak (= good product). FIG. 5 shows test results of the leak test.
【００１９】＜評価＞図５から明らかなように、ステン
レス板３枚の端部を溶接した電池容器Ｃの良品率が８２
％であったのし対し、電池容器Ａの良品率は９１％、電
池容器Ｂの良品率は９９％であった。この結果は電池容
器Ａ、Ｂを使用することにより、電池容器８のリーク不
良を低減させる効果があることを示すものである。ま
た、電池容器Ａより溶接辺が１辺多い電池容器Ｂの良品
率が電池容器Ａの良品率より高いのは、曲げ加工時のハ
ンドリングが電池容器Ｂのほうが良好なため、寸法精度
（及び折り曲げ精度）が向上することによる。すなわ
ち、電池容器Ｂは電池容器Ａに比べ、加工しやすく、か
つ、高い気密性を確保することができる。<Evaluation> As is clear from FIG. 5, the non-defective rate of the battery container C obtained by welding three stainless steel plate ends was 82%.
%, Whereas the non-defective rate of the battery container A was 91%, and the non-defective rate of the battery container B was 99%. This result indicates that the use of the battery containers A and B has an effect of reducing the leak failure of the battery container 8. In addition, the reason why the non-defective rate of the battery container B having one weld side larger than that of the battery container A is higher than the non-defective rate of the battery container A is that the handling at the time of bending is better in the battery container B, and therefore the dimensional accuracy (and the bending) is high. Accuracy). In other words, the battery container B is easier to process than the battery container A and can secure high airtightness.
【００２０】以上のように、本実施形態では、電池容器
８を１枚のステンレス板で構成するか（電池容器Ａ）、
又は、２枚のステンレス板で構成し（電池容器Ｂ）、リ
ークの原因となる溶接部分の長さが最短となるように工
夫すると共に、加工時のハンドリングとの関係を考慮し
て寸法精度等を高めるようにしたので、リーク防止に対
して信頼性の高い角型電池容器を確保することができ
る。このような角型電池容器は、試験結果からも明らか
な通り大型の角型非水電解液二次電池に好適に使用可能
であり、角型非水電解液二次電池の大型化に寄与するも
のである。As described above, in the present embodiment, whether the battery container 8 is formed of a single stainless steel plate (battery container A),
Alternatively, it is composed of two stainless steel plates (battery container B), and is designed so that the length of the welded portion that causes a leak is minimized, and the dimensional accuracy and the like are taken into consideration in consideration of handling during processing. Therefore, it is possible to secure a rectangular battery container having high reliability in preventing leakage. As is clear from the test results, such a rectangular battery container can be suitably used for a large-sized rectangular non-aqueous electrolyte secondary battery, and contributes to an increase in the size of the rectangular non-aqueous electrolyte secondary battery. Things.
【００２１】なお、本実施形態では、ステンレス板で電
池容器８を作製した例を示したが、本発明はステンレス
に限らず、他の金属材料にも適用可能である。In this embodiment, an example is shown in which the battery case 8 is made of a stainless steel plate. However, the present invention is not limited to stainless steel, but can be applied to other metal materials.
【００２２】[0022]
【発明の効果】以上説明したように、本発明の第１の態
様によれば、電池容器は１枚の板状金属部材が折り曲げ
られ金属部材の端部同士がレーザ溶接で接合されている
ので、折り曲げ箇所は接合の必要がなく接合箇所を少な
くすることができるため、接合部から非水電解液のリー
クを低減させることができ、第２の態様によれば、折り
曲げ箇所は接合の必要がなく接合箇所を少なくすること
ができるので、接合部から非水電解液のリークを低減さ
せることができると共に、電池容器となる部材を第１の
板状金属部材と第２の板状金属部材とに分割したので、
各板状金属部材の折り曲げ加工が容易となり寸法精度を
向上させることができることから、接合部からのリーク
防止の信頼性を高めることができる、という効果を得る
ことができる。As described above, according to the first embodiment of the present invention, the battery container is formed by bending one plate-shaped metal member and joining the ends of the metal member by laser welding. Since the bent portion does not need to be joined and the number of joined portions can be reduced, the leakage of the non-aqueous electrolyte from the joined portion can be reduced. According to the second aspect, the bent portion needs to be joined. And the number of joints can be reduced, so that the leakage of the non-aqueous electrolyte from the joints can be reduced, and the member serving as the battery container is made of a first plate-shaped metal member and a second plate-shaped metal member. Was divided into
Since the bending process of each plate-like metal member is facilitated and the dimensional accuracy can be improved, the effect of increasing the reliability of preventing leakage from the joint can be obtained.
【図１】本発明が適用可能な実施形態の角型リチウムイ
オン二次電池の電池容器の一部破断正面図である。FIG. 1 is a partially cutaway front view of a battery container of a prismatic lithium ion secondary battery according to an embodiment to which the present invention can be applied.
【図２】実施形態の角型リチウムイオン二次電池の電池
容器Ａの作製手順を示す概略斜視図であり、（Ａ）はス
テンレス板を略Ｔ字状に切り出した状態を示し、（Ｂ）
は折り曲げ加工の状態を示し、（Ｃ）は電池容器Ａの溶
接部を模式的に示す。FIGS. 2A and 2B are schematic perspective views illustrating a procedure for manufacturing a battery container A of the rectangular lithium ion secondary battery according to the embodiment, in which FIG. 2A shows a state in which a stainless steel plate is cut out in a substantially T-shape, and FIG.
Shows a state of bending processing, and (C) schematically shows a welded portion of the battery container A.
【図３】実施形態の角型リチウムイオン二次電池の電池
容器Ｂの作製手順を示す概略斜視図であり、（Ａ）は２
枚のステンレス板を折り曲げた状態を示し、（Ｂ）は２
枚のステンレス板を向かい合わせた状態を示し、（Ｃ）
は電池容器Ｂの溶接部を模式的に示す。FIG. 3 is a schematic perspective view showing a procedure for manufacturing a battery container B of the prismatic lithium ion secondary battery according to the embodiment, and FIG.
(B) shows a state in which two stainless steel plates are bent.
(C) shows a state in which two stainless steel plates are facing each other.
Schematically shows a welded portion of the battery container B.
【図４】実施形態の角型リチウムイオン二次電池の電池
容器Ｃの溶接前の状態を示す概略斜視図である。FIG. 4 is a schematic perspective view showing a state before welding of a battery case C of the prismatic lithium ion secondary battery of the embodiment.
【図５】電池容器のリーク試験の試験結果（良品率）を
示すグラフである。FIG. 5 is a graph showing a test result (non-defective rate) of a leak test of a battery container.
１ ステンレス板（第１の板状金属部材） ２ ステンレス板（第２の板状金属部材） ４ 板（板状金属部材） ８ 電池容器 ９ 電池蓋 ２０ 角型リチウムイオン二次電池（角型非水電解液二
次電池）Reference Signs List 1 stainless steel plate (first plate-shaped metal member) 2 stainless steel plate (second plate-shaped metal member) 4 plate (plate-shaped metal member) 8 battery container 9 battery lid 20 prismatic lithium ion secondary battery (square non-metallic member) Water electrolyte secondary battery)
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 5H011 AA09 AA17 CC06 DD06 DD13 KK01 5H029 AJ14 AJ15 AM03 AM05 AM07 BJ02 CJ03 CJ05 DJ02 DJ11 EJ01 HJ04 HJ12 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5H011 AA09 AA17 CC06 DD06 DD13 KK01 5H029 AJ14 AJ15 AM03 AM05 AM07 BJ02 CJ03 CJ05 DJ02 DJ11 EJ01 HJ04 HJ12
Claims (3)
開口した角型電池容器を有する角型非水電解液二次電池
において、前記電池容器は、１枚の板状金属部材が折り
曲げられ該金属部材の端部同士がレーザ溶接で接合され
ていることを特徴とする角型非水電解液二次電池。1. A rectangular non-aqueous electrolyte secondary battery having a rectangular battery container having a rectangular parallelepiped shape and one open side for attaching a lid, wherein the battery container is formed by bending a single plate-shaped metal member. A rectangular nonaqueous electrolyte secondary battery, wherein ends of metal members are joined by laser welding.
開口した角型電池容器を有する角型非水電解液二次電池
において、前記電池容器は、前記直方体の２面を構成す
るように断面Ｌ字状に折り曲げられた第１の板状金属部
材と、前記直方体の３面を構成するように断面コ字状に
折り曲げられた第２の板状金属部材と、が向かい合わさ
れ前記第１及び第２の金属部材の端部同士がレーザ溶接
で接合されていることを特徴とする角型非水電解液二次
電池。2. A rectangular non-aqueous electrolyte secondary battery having a rectangular battery container having a rectangular parallelepiped shape and one side open for attaching a lid, wherein the battery container has a cross section that forms two surfaces of the rectangular parallelepiped. The first plate-shaped metal member bent in an L-shape and the second plate-shaped metal member bent in a U-shape in cross section so as to form three surfaces of the rectangular parallelepiped face each other, and the first and the second metal members are opposed to each other. A rectangular nonaqueous electrolyte secondary battery, wherein ends of the second metal member are joined by laser welding.
うち最も長い辺を含む面であることを特徴とする請求項
１又は請求項２に記載の角型非水電解液二次電池。3. The rectangular non-aqueous electrolyte secondary battery according to claim 1, wherein the one surface is a surface including the longest side among the respective sides constituting the rectangular parallelepiped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000396431A JP2002198011A (en) | 2000-12-27 | 2000-12-27 | Square-shaped nonaqueous electrolyte secondary cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000396431A JP2002198011A (en) | 2000-12-27 | 2000-12-27 | Square-shaped nonaqueous electrolyte secondary cell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002198011A true JP2002198011A (en) | 2002-07-12 |
Family
ID=18861723
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000396431A Abandoned JP2002198011A (en) | 2000-12-27 | 2000-12-27 | Square-shaped nonaqueous electrolyte secondary cell |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002198011A (en) |
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