JP2004319108A - Flat battery - Google Patents

Flat battery Download PDF

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Publication number
JP2004319108A
JP2004319108A JP2003107589A JP2003107589A JP2004319108A JP 2004319108 A JP2004319108 A JP 2004319108A JP 2003107589 A JP2003107589 A JP 2003107589A JP 2003107589 A JP2003107589 A JP 2003107589A JP 2004319108 A JP2004319108 A JP 2004319108A
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JP
Japan
Prior art keywords
side wall
peripheral side
battery
positive electrode
negative electrode
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
Application number
JP2003107589A
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Japanese (ja)
Inventor
Hirokazu Yoshikawa
博和 吉川
Hideto Itano
秀人 板野
Tadashi Kobayashi
忠 小林
Seiichi Akita
聖一 秋田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Maxell Holdings Ltd
Kaga Inc
Original Assignee
Hitachi Maxell Ltd
Kaga Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Maxell Ltd, Kaga Inc filed Critical Hitachi Maxell Ltd
Priority to JP2003107589A priority Critical patent/JP2004319108A/en
Publication of JP2004319108A publication Critical patent/JP2004319108A/en
Pending legal-status Critical Current

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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

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  • Sealing Battery Cases Or Jackets (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To improve electrolyte leakage resistance in a flat battery. <P>SOLUTION: A battery can 1 for storing a power generation element comprises: a metallic positive electrode can 5 formed by bending a circumferential side wall 3 upward from the periphery of a bottom surface wall 2; and a metallic negative electrode can 9 formed by bending a circumferential side wall 7 downward from the periphery of an upper surface wall 6. An opening upper end part 3a of the side wall 3 of the electrode can 5 is crimped inward by interlaying a sealing gasket 17. A spring piece 16 elastically deformable inward by being folded back upward is formed outside a lower end 15 of the wall surface 7 of the electrode can 9. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、発電要素を収容する電池缶１が、底面壁２の外周に周側壁３を上向きに曲げた金属製の正極缶５と、上面壁６の外周に周側壁７を下向きに曲げた金属製の負極缶９とを含み、正極缶５の周側壁３の開口上端部分３ａが内方に向けて封口ガスケット１７を介してかしめ加工された扁平形電池に関する。
【０００２】
【従来の技術】
この種の電池では、正極缶５の周側壁３が垂直部分３ｂと、かしめ加工されてカールした開口上端部分３ａとからなるが、一般に垂直部分３ｂと負極缶９の外周下端部１５との間における加圧力が不足し勝ちである。これは電池内からの漏液問題につながる。
【０００３】
ましてや扁平角形電池では、封口かしめ部分の封口力がコーナーにおいて強くなり過ぎ、周方向でバラつきが出やすい。本発明の公知技術に特許文献１〜３があり、これらは扁平角形電池における耐漏液性の向上を狙っている。
【０００４】
このうち特許文献１の図６は、負極缶９の外周下端部１５の外側に、遊端壁２０を密着状に折り返し形成した形態が図示されている。
【０００５】
【特許文献１】
特開２０００−１６４２５９号公報（段落番号００１５−００１９、図１）
【特許文献２】
特開２００１−３０７６９２号公報（段落番号００１１−００１２、図１）
【特許文献３】
特開２００２−１３４０７１号公報（段落番号００１４−００１８、図１−５）
【０００６】
【発明が解決しようとする課題】
問題は、特許文献１の遊端壁２０が、下端部１５の外側に自由状態においても密着重合している点にある。これでは、図６で説明すると、正極缶５の周側壁３において、かしめ加工でカール（屈曲）する開口上端部分３ａと、負極缶９の周側壁７の段部１３および遊端壁２０との間では、加圧力を利かすことはできるが、周側壁３の垂直部分３ｂと下端部１５および遊端壁２０との間では、加圧力が不足する。
【０００７】
先の加圧力不足を補おうとすると、開口上端部分３ａと、負極缶９との間の加圧力が過ぎて、電池缶の変形・損傷など新たな問題を招くおそれがある。先の扁平角形電池になると、コーナー部での加圧力の過度が更に顕著に現出する。
【０００８】
そこで本発明の目的は、正極缶と負極缶との封口かしめ部分において、正極缶の周側壁の垂直部分を含む全体が、負極缶に対して加圧力がほぼ均一に過不足なく作用するようにし、以て耐漏液性に優れた扁平形電池を提供することにある。とくに本発明は、扁平角形電池においても、封口かしめ部分が周方向にわたって過不足のない加圧力で封口されるようにすることにある。
【０００９】
【課題を解決するための手段】
本発明は、例えば図１に示すごとく、発電要素を収容する電池缶１が、底面壁２の外周から周側壁３を上向きに曲げた金属製の正極缶５と、上面壁６の外周から周側壁７を下向きに曲げた金属製の負極缶９とを含み、正極缶５の周側壁３の開口上端部分３ａが内方に向けて封口ガスケット１７を介してかしめ加工された扁平形電池において、負極缶９の周側壁７の下端部１５の外側に、上向きに折り返されて内向きに弾性変形可能なばね片１６を備えていることを特徴とする。ばね片１６が内向きに弾性変形可能とは、図２の自由状態において、ばね片１６が下端部１５の外側に密着せず隙間ｇを介してＵ字状ないしＶ字状に離れていることを意味する。
【００１０】
具体的には、前記ばね片１６が、自由状態において上端側に行くに従って外向きに開く傾斜状に形成されている。
【００１１】
【発明の作用効果】
正極缶５の周側壁３の開口上端部分３ａを内方へ向けてかしめ加工したとき、負極缶９側のばね片１６が内向きに弾性変形し、ばね片１６が弾性復元力で封口ガスケット１７を外側方に向けて押し返そうとするばね力を発揮し、周側壁３の垂直部分３ｂとばね片１６との間でも封口ガスケット１７が圧縮作用を受ける。従って、正極缶５の周側壁３の開口上端部分３ａと垂直部分３ｂとは、封口かしめ部分において負極缶９に対して封口ガスケット１７を介してほぼ均一な圧力で封口する。その結果、耐漏液性に優れた扁平形電池を得ることができる。
【００１２】
しかも、先の加圧力は過ぎれば、ばね片１６が内方へ大きく弾性変形することで過度の加圧力を吸収する。従って、正極缶５の周側壁３における開口上端部分３ａと垂直部分３ｂとの加圧力の過不足は、封口かしめ部分の周方向においてコーナー部で過大になることを防いで調整するので、コーナー部を持つ扁平角形電池においても好適である。
【００１３】
【発明の実施の形態】
（第１実施例） 図１および図２は、本発明の第１実施例である扁平角形電池を示す。発電要素を収容する電池缶１は、正方形の底面壁２の外周から周側壁３を上方へ向けて垂直に曲げた金属製の正極缶５と、正方形の上面壁６の外周から周側壁７を下方へ向けて曲げた金属製の負極缶９とを含む。正極缶５および負極缶９は、ステンレス鋼や、アルミニウム−ステンレスのクラッド材でプレス成形されている。
【００１４】
発電要素として、正極缶５には、活物質である二酸化マンガンをプレス成形した正極材１０が収納され、負極缶９には、金属リチウムからなる負極材１１が収納されている。正極材１０と負極材１１との間には、ポリプロピレン製不織布からなるセパレータ１２が介在する。
【００１５】
電池組み立て前のブランク状態における正極缶５は、図２に示すごとく上面が開口する角皿状を呈している。一方、ブランク状態における負極缶９は、図２に示すごとく下面が開口する角皿状を呈している。
【００１６】
負極缶９の周側壁７は、図２に示すごとく、上下の中間に外側へ張り出す段部１３を有し、該段部１３より下方の下端部１５が垂直状に形成されており、下端部１５の外側に下端部１５の下端全周からばね片１６が上向きに折り返し形成されている。
【００１７】
ここでは、ばね片１６が自由（ブランク）状態において、下端部１５に対し上端側に行くほど下端部１５から離れる外向きの傾斜状になっており、従って下端部１５とばね片１６との間に断面Ｖ字形状の隙間ｇが生じている点にある。これにより、ばね片１６は下端部１５側すなわち内向きに弾性変形可能である。
【００１８】
電池の組み立てに際しては、図２に示すごとく、負極缶９の周側壁７に封口ガスケット１７を装着して、正極缶５に負極缶９を嵌合し、正極缶５の周側壁３の開口上端部３ａを内方に向けてかしめ加工する。これで正極缶５の周側壁３と、負極缶９の周側壁７の段部１３、下端部１５およびばね片１６との間において封口ガスケット１７が圧縮状態に加圧されて介在する。封口ガスケット１７は、ポリプロピレン樹脂やポリフェニレンサルファイド樹脂などの絶縁材を素材にして、射出成形によって成形されている。
【００１９】
よって得られた電池缶１は、底面壁２の一辺が２４ｍｍ、上下厚みが３ｍｍ、四隅部の半径寸法が３ｍｍの円弧とした。
【００２０】
かしめ加工したときに、ばね片１６は加圧力を受けて負極缶９の周側壁７の下端部１５側へ弾性変形し、ばね片１６の内方への弾性変形により、ばね片１６には図１の矢印に示すごとく缶外方への弾性復元力が働く。これで、ばね片１６と正極缶５の周側壁３の垂直部分３ｂとの間でも、封口ガスケット１７が内外方向から加圧されて圧縮作用を受ける。
【００２１】
つまり、正極缶５の周側壁３のカールした開口上端部分３ａと、負極缶９の周側壁７における段部１３およびばね片１６の上端との間において、封口ガスケット１７は本来の圧縮作用を受けている。したがって、正極缶５の周側壁３は、開口上端部分３ａが局部的に偏った状態で封口ガスケット１７を加圧するだけでなく、垂直部分３ｂにおいても封口ガスケット１７を加圧している点が注目されるべきである。
【００２２】
このように、正極缶５の周側壁３が全体的にほぼ均一状態で封口ガスケット１７を全周にわたって加圧するので、該当部位での電池内からの漏液を広い面積で確実に防止できる。
【００２３】
かしめ加工時の加圧力の偏りは、ばね片１６の弾性変形量で吸収できる。従って、扁平角形電池において、該当の加圧力が過大になりやすい四隅部でも、電池缶１に局部的な変形や損傷を生じ難いものになる。
【００２４】
（第２実施例） 図３および図４は、本発明に係る扁平角形電池の第２実施例を示しており、負極缶９のばね片１６が、下端部１５に対してヘアピン状に立ち上がっている。その他の構成は第１実施例と実質的に同じであるから、同一部材には同一符号を付して説明を省略する。
【００２５】
第２実施例ばね片１６は、連出下端側が下端部１５の外面に接触しているので、その分だけばね片１６の弾性復元力が第１実施例のそれよりも大きい。
【００２６】
（比較例） 図５は比較例として挙げた扁平角形電池を示しており、負極缶９の周側壁７の傾斜下端から封止壁２１を水平状に、つまり正極缶５の周側壁３の垂直部分３ｂと直交する状態で曲げ連出した。その他の構成は第１実施例と実質的に同一であるから、同一部材には同一符号を付して説明を省略する。
【００２７】
（比較試験） 第１実施例の扁平角形電池と、図５に示す比較例の扁平角形電池とをそれぞれ５０個ずつ用意し、それらを６０℃の雰囲気温度で、かつ９０％ＲＨ（相対湿度）の条件下に置いて、漏液の有無を目視によって確認した。この結果、比較例の電池では、５０個のうち４０個に液漏れが確認された。これに対して、第１実施例の電池では、５０個全てに液漏れが発生しなかった。
【００２８】
この試験結果から明らかな通り、第１実施例の扁平角形電池は、耐漏液性に優れており、正極缶５と負極缶９との封口かしめ部分における封口性が高く維持されることが判った。
【００２９】
（その他の実施例） 第１・第２実施例に挙げた扁平角形電池では、ばね片１６の曲げ加工がしやすいようにするために、各コーナー部において割りを入れてあってもよい。扁平角形電池とは、平面視で長方形ないし馬蹄形であってもよい。本発明は、電池缶１が平面視で円形のボタン型電池の類も含む。
【図面の簡単な説明】
【図１】第１実施例の要部の縦断面図
【図２】第１実施例の分解状態での縦断面図
【図３】第２実施例のブランク状態での正極缶の縦断面図
【図４】第２実施例の要部の縦断面図
【図５】比較例の要部の縦断面図
【図６】従来例の要部の縦断面図
【符号の説明】
１ 電池缶
２ 正極缶の底面壁
３ 正極缶の周側壁
３ａ 正極缶の周側壁の開口上端部分
３ｂ 正極缶の周側壁の垂直部分
５ 正極缶
６ 負極缶の上面壁
７ 負極缶の周側壁
９ 負極缶
１５ 負極缶の周側壁の下端部
１６ 負極缶の周側壁のばね片
１７ 封口ガスケット[0001]
TECHNICAL FIELD OF THE INVENTION
In the present invention, a battery can 1 containing a power generating element has a metal positive electrode can 5 having a peripheral wall 3 bent upward on the outer periphery of a bottom wall 2 and a peripheral wall 7 bent downward on the outer periphery of a top wall 6. The present invention relates to a flat battery including a metal negative electrode can 9, wherein an upper end portion 3 a of an opening of a peripheral side wall 3 of a positive electrode can 5 is swaged inward via a sealing gasket 17.
[0002]
[Prior art]
In this type of battery, the peripheral side wall 3 of the positive electrode can 5 is composed of a vertical portion 3b and an opening upper end portion 3a which is crimped and curled. In general, between the vertical portion 3b and the outer peripheral lower end 15 of the negative electrode can 9 Pressure is insufficient. This leads to the problem of liquid leakage from inside the battery.
[0003]
Furthermore, in the case of a flat prismatic battery, the sealing force of the swaged portion is too strong at the corner, so that variation tends to occur in the circumferential direction. There are Patent Literatures 1 to 3 in the known art of the present invention, which aim at improving the liquid leakage resistance of a flat rectangular battery.
[0004]
FIG. 6 of Patent Literature 1 illustrates a form in which a free end wall 20 is formed in a tightly folded state outside the outer peripheral lower end portion 15 of the negative electrode can 9.
[0005]
[Patent Document 1]
JP-A-2000-164259 (paragraph number 0015-0019, FIG. 1)
[Patent Document 2]
Japanese Patent Application Laid-Open No. 2001-307792 (Paragraph No. 0011-0012, FIG. 1)
[Patent Document 3]
JP-A-2002-134071 (paragraph number 0014-0018, FIG. 1-5)
[0006]
[Problems to be solved by the invention]
The problem is that the free end wall 20 of Patent Document 1 is in close contact with the outside of the lower end portion 15 even in a free state. Referring to FIG. 6, in the peripheral side wall 3 of the positive electrode can 5, the upper end 3 a of the opening that is curled (bent) by caulking and the step portion 13 and the free end wall 20 of the peripheral side wall 7 of the negative electrode can 9. Between them, the pressing force can be used, but the pressing force is insufficient between the vertical portion 3b of the peripheral side wall 3 and the lower end portion 15 and the free end wall 20.
[0007]
If an attempt is made to compensate for the shortage of the pressing force, the pressing force between the upper end portion 3a of the opening and the negative electrode can 9 passes, which may cause new problems such as deformation and damage of the battery can. In the case of the above flat battery, excessive pressure at the corners becomes more noticeable.
[0008]
Therefore, an object of the present invention is to ensure that the entire pressure including the vertical portion of the peripheral side wall of the positive electrode can, at the sealing portion of the positive electrode can and the negative electrode can, acts on the negative electrode can almost uniformly without excess or shortage. Accordingly, an object of the present invention is to provide a flat battery having excellent liquid leakage resistance. In particular, the present invention is intended to ensure that even in a flat prismatic battery, the sealed caulked portion is sealed with a sufficient pressing force in the circumferential direction.
[0009]
[Means for Solving the Problems]
For example, as shown in FIG. 1, a battery can 1 for accommodating a power generation element includes a metal positive electrode can 5 in which a peripheral side wall 3 is bent upward from an outer periphery of a bottom wall 2 and a battery can 1 that surrounds the outer periphery of an upper surface wall 6. In a flat battery including a metal negative electrode can 9 having a side wall 7 bent downward, an opening upper end portion 3a of a peripheral side wall 3 of the positive electrode can 5 is swaged inward via a sealing gasket 17; Outside the lower end 15 of the peripheral side wall 7 of the negative electrode can 9, there is provided a spring piece 16 which is folded upward and is elastically deformable inward. The spring piece 16 can be elastically deformed inward when the spring piece 16 is not in close contact with the outside of the lower end portion 15 and is separated in a U-shape or a V-shape via a gap g in the free state of FIG. Means
[0010]
Specifically, the spring piece 16 is formed so as to be inclined outwardly toward the upper end in the free state.
[0011]
Effects of the Invention
When the upper end portion 3a of the opening of the peripheral side wall 3 of the positive electrode can 5 is crimped inward, the spring piece 16 on the negative electrode can 9 is elastically deformed inward, and the spring piece 16 is elastically restored by the sealing gasket 17. Exerts a spring force to push back toward the outside, and the sealing gasket 17 is also compressed between the vertical portion 3 b of the peripheral side wall 3 and the spring piece 16. Therefore, the opening upper end portion 3a and the vertical portion 3b of the peripheral side wall 3 of the positive electrode can 5 are sealed with the negative electrode can 9 through the sealing gasket 17 at a substantially uniform pressure in the sealing caulking portion. As a result, a flat battery excellent in liquid leakage resistance can be obtained.
[0012]
In addition, if the above pressing force has passed, the spring piece 16 is largely elastically deformed inward to absorb the excessive pressing force. Therefore, the excess and deficiency of the pressing force between the opening upper end portion 3a and the vertical portion 3b in the peripheral side wall 3 of the positive electrode can 5 is adjusted by preventing the corner portion in the circumferential direction of the sealing portion from being excessively adjusted. It is also suitable for a flat prismatic battery having
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
First Embodiment FIGS. 1 and 2 show a flat prismatic battery according to a first embodiment of the present invention. The battery can 1 containing the power generating element includes a metal positive electrode can 5 in which the peripheral side wall 3 is bent vertically upward from the outer periphery of the square bottom wall 2 and a peripheral side wall 7 from the outer periphery of the square top wall 6. And a metal negative electrode can 9 bent downward. The positive electrode can 5 and the negative electrode can 9 are press-formed with stainless steel or aluminum-stainless clad material.
[0014]
As a power generating element, a positive electrode material 5 formed by press-molding manganese dioxide as an active material is stored in a positive electrode can 5, and a negative electrode material 11 made of metallic lithium is stored in a negative electrode can 9. A separator 12 made of a nonwoven fabric made of polypropylene is interposed between the positive electrode material 10 and the negative electrode material 11.
[0015]
The positive electrode can 5 in a blank state before assembling the battery has a square dish shape with an open top as shown in FIG. On the other hand, the negative electrode can 9 in the blank state has a square dish shape with an open lower surface as shown in FIG.
[0016]
As shown in FIG. 2, the peripheral side wall 7 of the negative electrode can 9 has a step 13 projecting outward in the middle between the upper and lower sides, and a lower end 15 below the step 13 is formed vertically. A spring piece 16 is formed on the outside of the portion 15 from the entire lower end of the lower end portion 15 so as to be folded upward.
[0017]
Here, when the spring piece 16 is in a free (blank) state, it is inclined outward away from the lower end 15 toward the upper end with respect to the lower end 15. Is that a gap g having a V-shaped cross section is formed at the center. Thereby, the spring piece 16 can be elastically deformed toward the lower end portion 15, that is, inward.
[0018]
When assembling the battery, as shown in FIG. 2, a sealing gasket 17 is attached to the peripheral side wall 7 of the negative electrode can 9, the negative electrode can 9 is fitted to the positive electrode can 5, and the upper end of the opening of the peripheral side wall 3 of the positive electrode can 5 The portion 3a is swaged inward. Thus, the sealing gasket 17 is pressurized in a compressed state and interposed between the peripheral side wall 3 of the positive electrode can 5 and the stepped portion 13, the lower end portion 15 and the spring piece 16 of the peripheral side wall 7 of the negative electrode can 9. The sealing gasket 17 is formed by injection molding using an insulating material such as a polypropylene resin or a polyphenylene sulfide resin as a material.
[0019]
Thus, the obtained battery can 1 was formed into an arc having one side of the bottom wall 2 of 24 mm, a vertical thickness of 3 mm, and a radius of four corners of 3 mm.
[0020]
When caulking is performed, the spring piece 16 is elastically deformed toward the lower end portion 15 of the peripheral side wall 7 of the negative electrode can 9 by receiving a pressing force, and the spring piece 16 is elastically deformed inward. As shown by the arrow 1, an elastic restoring force acts on the outside of the can. Thus, even between the spring piece 16 and the vertical portion 3b of the peripheral side wall 3 of the positive electrode can 5, the sealing gasket 17 is pressurized from inside and outside and is subjected to a compressing action.
[0021]
That is, between the curled opening upper end portion 3 a of the peripheral side wall 3 of the positive electrode can 5 and the upper end of the step portion 13 and the spring piece 16 on the peripheral side wall 7 of the negative electrode can 9, the sealing gasket 17 receives the original compression action. ing. Therefore, it is noted that the peripheral side wall 3 of the positive electrode can 5 presses the sealing gasket 17 not only in a state where the upper end portion 3a of the opening is locally biased but also in the vertical portion 3b. Should be.
[0022]
As described above, since the sealing gasket 17 is pressurized over the entire circumference in a state where the peripheral side wall 3 of the positive electrode can 5 is substantially uniform as a whole, liquid leakage from the inside of the battery at the corresponding portion can be reliably prevented with a wide area.
[0023]
The bias of the pressing force during caulking can be absorbed by the amount of elastic deformation of the spring piece 16. Therefore, in the flat rectangular battery, even at the four corners where the corresponding pressure is likely to be excessive, the battery can 1 is unlikely to be locally deformed or damaged.
[0024]
Second Embodiment FIGS. 3 and 4 show a flat battery according to a second embodiment of the present invention, in which the spring piece 16 of the negative electrode can 9 rises in a hairpin shape with respect to the lower end 15. I have. The other configuration is substantially the same as that of the first embodiment, and the same members are denoted by the same reference numerals and description thereof will be omitted.
[0025]
In the second embodiment, since the lower end side of the spring piece 16 is in contact with the outer surface of the lower end portion 15, the elastic restoring force of the spring piece 16 is larger than that of the first embodiment.
[0026]
(Comparative Example) FIG. 5 shows a flat rectangular battery as a comparative example, in which the sealing wall 21 is horizontal from the inclined lower end of the peripheral side wall 7 of the negative electrode can 9, that is, the vertical direction of the peripheral side wall 3 of the positive electrode can 5. Bending was performed in a state perpendicular to the portion 3b. The other configuration is substantially the same as that of the first embodiment.
[0027]
(Comparative Test) Fifty flat batteries of the first example and fifty flat batteries of the comparative example shown in FIG. 5 were prepared, and they were placed at an ambient temperature of 60 ° C. and 90% RH (relative humidity). , And the presence or absence of liquid leakage was visually confirmed. As a result, in the battery of the comparative example, liquid leakage was confirmed in 40 cells out of 50 cells. On the other hand, in the batteries of the first embodiment, no liquid leakage occurred in all 50 batteries.
[0028]
As is clear from the test results, it was found that the flat prismatic battery of the first example was excellent in the liquid leakage resistance, and the sealing property in the sealing portion of the positive electrode can 5 and the negative electrode can 9 was kept high. .
[0029]
(Other Examples) In the flat rectangular batteries described in the first and second examples, each of the corners may be split to facilitate bending of the spring piece 16. The flat battery may have a rectangular shape or a horseshoe shape in plan view. The present invention includes a kind of button type battery whose battery can 1 is circular in plan view.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a main part of a first embodiment. FIG. 2 is a longitudinal sectional view of an exploded state of the first embodiment. FIG. 3 is a longitudinal sectional view of a positive electrode can in a blank state of the second embodiment. FIG. 4 is a vertical cross-sectional view of a main part of a second embodiment. FIG. 5 is a vertical cross-sectional view of a main part of a comparative example. FIG. 6 is a vertical cross-sectional view of a main part of a conventional example.
DESCRIPTION OF SYMBOLS 1 Battery can 2 Bottom wall of positive electrode can 3 Peripheral side wall of positive electrode can 3a Opening upper end portion of peripheral side wall of positive electrode can 3b Vertical portion of peripheral side wall of positive electrode can 5 Positive electrode can 6 Top wall of negative electrode can 7 Peripheral side wall of negative electrode can 9 Negative electrode can 15 Lower end 16 of peripheral side wall of negative electrode can 16 Spring piece 17 of peripheral side wall of negative electrode can 17 Sealing gasket

Claims (3)

発電要素を収容する電池缶が、底面壁の外周から周側壁を上向きに曲げた金属製の正極缶と、上面壁の外周から周側壁を下向きに曲げた金属製の負極缶とを含み、前記正極缶の前記周側壁の開口上端部分が内方に向けて封口ガスケットを介してかしめ加工された扁平形電池において、
前記負極缶の前記周側壁の下端部の外側に、上向きに折り返されて内向きに弾性変形可能なばね片を備えていることを特徴とする扁平形電池。A battery can housing the power generating element includes a metal positive electrode can with the peripheral side wall bent upward from the outer periphery of the bottom wall, and a metal negative electrode can with the peripheral side wall bent downward from the outer periphery of the top wall, In a flat battery in which the upper end of the opening of the peripheral side wall of the positive electrode can is swaged inward through a sealing gasket toward the inside,
A flat battery comprising a spring piece that is folded upward and elastically deforms inward outside a lower end of the peripheral side wall of the negative electrode can. 前記ばね片が、自由状態において上端側に行くに従って外向きに開く傾斜状に形成されている請求項１記載の扁平形電池。2. The flat battery according to claim 1, wherein the spring piece is formed so as to be inclined outwardly toward the upper end in a free state. 3. 前記電池缶が、扁平角形である請求項１又は２記載の扁平形電池。The flat battery according to claim 1, wherein the battery can has a flat rectangular shape.
JP2003107589A 2003-04-11 2003-04-11 Flat battery Pending JP2004319108A (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5165213U (en) * 1974-11-20 1976-05-22
JPS599850A (en) * 1982-07-08 1984-01-19 Matsushita Electric Ind Co Ltd Enclosed type battery
JPS59141162A (en) * 1983-02-01 1984-08-13 Matsushita Electric Ind Co Ltd Enclosed type cell
JPS6053162U (en) * 1983-09-20 1985-04-15 富士電気化学株式会社 flat sealed battery
JPH01121259U (en) * 1988-02-10 1989-08-17
JP2000164259A (en) * 1998-11-30 2000-06-16 Matsushita Electric Ind Co Ltd Flat nonaqueous electrolyte battery and its manufacture
JP2004014291A (en) * 2002-06-06 2004-01-15 Toshiba Battery Co Ltd Flat battery

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5165213U (en) * 1974-11-20 1976-05-22
JPS599850A (en) * 1982-07-08 1984-01-19 Matsushita Electric Ind Co Ltd Enclosed type battery
JPS59141162A (en) * 1983-02-01 1984-08-13 Matsushita Electric Ind Co Ltd Enclosed type cell
JPS6053162U (en) * 1983-09-20 1985-04-15 富士電気化学株式会社 flat sealed battery
JPH01121259U (en) * 1988-02-10 1989-08-17
JP2000164259A (en) * 1998-11-30 2000-06-16 Matsushita Electric Ind Co Ltd Flat nonaqueous electrolyte battery and its manufacture
JP2004014291A (en) * 2002-06-06 2004-01-15 Toshiba Battery Co Ltd Flat battery

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