JP3662615B2 - Square battery - Google Patents
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- JP3662615B2 JP3662615B2 JP31814594A JP31814594A JP3662615B2 JP 3662615 B2 JP3662615 B2 JP 3662615B2 JP 31814594 A JP31814594 A JP 31814594A JP 31814594 A JP31814594 A JP 31814594A JP 3662615 B2 JP3662615 B2 JP 3662615B2
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- 238000007789 sealing Methods 0.000 claims description 23
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 239000008151 electrolyte solution Substances 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 25
- 229910052987 metal hydride Inorganic materials 0.000 description 7
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 7
- 229910052759 nickel Inorganic materials 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- -1 nickel metal hydride Chemical class 0.000 description 5
- 238000005452 bending Methods 0.000 description 4
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 3
- 229910001882 dioxygen Inorganic materials 0.000 description 3
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 description 2
- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 229920003051 synthetic elastomer Polymers 0.000 description 2
- 239000005061 synthetic rubber Substances 0.000 description 2
- 238000013022 venting Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
-
- 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)
Description
【０００１】
【産業上の利用分野】
本発明は有底矩形筒状の容器内の折曲部と段部とにより囲まれた位置に封口部材が絶縁ガスケットを介してかしめ固定された構造を有する角形電池に関するものである。
【０００２】
【従来の技術】
近年、機器の小型軽量化にともない、体積効率の高い角形電池の開発が行われている。前記角形電池としては、角形ニッケルカドミウム二次電池や角形ニッケル水素二次電池などの角形アルカリ二次電池が知られている。アルカリ二次電池を充電すると、充電末期に正極から酸素ガスが発生する。発生した酸素ガスは負極で再結合吸収されるため、電池内圧が所望の値に保たれる。しかしながら、前記二次電池を急速充電すると、前記正極から発生する酸素ガスにより電池内圧が上昇する。電池内圧が過度に上昇すると前記二次電池が破裂する恐れがあるため、前記二次電池には防爆機能が設けられている。
【０００３】
防爆機能を有する二次電池は次のような方法により製造される。上部に矩形枠状の開口部と前記開口部の下方に形成された内方に突出した形状の段部とを有する有底矩形筒状の容器を用意する。前記容器内に正極と負極との間にセパレータを介して作製された電極群を収納した後、アルカリ電解液を収容する。底部に矩形穴を有する有底矩形筒状の絶縁ガスケット内に封口部材を収納する。この絶縁ガスケットを前記容器内の段部に載置し、前記開口部を縮径する。ひきつづき、前記開口部の上端を内方に折り曲げて折曲部を形成し、前記封口部材を前記折曲部と段部とにより囲まれた空間にかしめ固定することにより前記二次電池を製造する。前記封口部材は、ガス抜き孔を有する封口板と、前記封口板にそのガス抜き孔を囲むように載置され、ガス通過孔を有する帽子形の端子キャップと、前記封口板と前記端子キャップとの間に前記ガス抜き孔を覆うように配置された合成ゴム製の弾性弁体とから構成される。
【０００４】
このような構成の二次電池においてガスが発生し、所望の値のガス圧力が前記封口板のガス抜き孔を通して前記弾性弁体に加わると、前記弁体は変形して持ち上げられるため、前記封口板と前記弁体との間に隙間が生じる。その結果、前記ガスは前記隙間，前記端子キャップのガス通過孔を通して外部へ逃散するため、破裂が防止される。
【０００５】
ところで、前記二次電池において、例えば急速充電により前記容器内にガスが発生してガス圧力が上昇すると、前記ガス圧力により前記容器の前記開口部の長手方向側の面が外方へ湾曲するという問題点があった。その結果、前記開口部の長手方向側内面と絶縁ガスケットとの間に隙間が生じ、防爆機構が作動する前に前記電池の気密性が低下するという問題点があった。
【０００６】
このため、前記容器の硬度を高めたり、あるいは前記容器の開口部の厚さを厚くすることにより前記容器の開口部の強度を高めることが行われている。しかしながら、前記容器の開口部の強度を高めると、前記開口部の加工性が劣るという問題点があった。従って、前記容器を備えた二次電池は、前記開口部の上端を内方に折り曲げる工程において前記容器が過度に押圧されるため、前記容器の下部に歪みや凹み等の変形が生じ、前記容器内に前記封口部材を気密に取付けることが困難になるという問題点があった。
【０００７】
【発明が解決しようとする課題】
本発明の目的は、長手方向側の面の強度が向上され、かつ加工性が優れた開口部を有する容器を備えた角形電池を提供しようとするものである。
【０００８】
【課題を解決するための手段】
本発明は、上部に矩形枠状の開口部と前記開口部の下方に形成された内方に突出した形状の段部とを有する有底矩形筒状の容器と、前記容器内に収納され、正極と負極との間にセパレータを介して作製された電極群と、前記容器内に収容された電解液と、前記容器内の段部に載置されて前記開口部の上端を内方に折り曲げることにより前記段部と折曲部とにより囲まれた空間に圧縮状態で配置された底部に矩形穴を有する有底矩形筒状の絶縁ガスケットと、前記絶縁ガスケット内に配置され、前記ガスケットの圧縮下においてかしめ固定される封口板とを具備した角形電池において、前記容器は、前記開口部の長手方向側の面の厚さをＬ1 とし、前記開口部の長手方向と直交する面の厚さをＬ2 とした時に次式
Ｌ1 ＞Ｌ2 （１）
を満たす構造を有することを特徴とするものである。
【０００９】
前記容器は、前記段部より下方に位置する側面の厚さをＬ0 とした時に次に示す式
Ｌ1 ＞Ｌ0 ≧Ｌ2 （２）
か、または
Ｌ1 ＝Ｌ0 ＞Ｌ2 （３）
を満たす構造を有することが好ましい。前記（２）式か、または前記（３）式を満たす構造を有する容器は、前記段部より下方に位置する部分の強度が高く、かつ所望の体積を有する電極群を収納することができるため、好適である。
【００１０】
前記容器が前記（２）式または前記（３）式を満し、前記厚さＬ0 を１とした時に、前記厚さＬ1 を１〜１．１にし、かつ前記厚さＬ2 を０．８５〜１にすることが好ましい。これは次のような理由によるものである。前記厚さＬ1 を１未満にすると、前記電池内にガスが発生して内圧が上昇した際に前記容器の開口部が外側に湾曲しやすくなる恐れがあるため、所望の封口強度が得られなくなる恐れがある。一方、前記厚さＬ1 が１．１を越えると、前記開口部のコーナ部の加工性が低下する恐れがあるため、前記容器に歪みや凹み等の変形が生じる恐れがある。また、前記厚さＬ2 を０．８５未満にすると、前記開口部の強度が低下する恐れがあるため、前記開口部の上端を折り曲げる工程において前記容器の短辺側に凹みや歪み等の変形が生じる恐れがある。一方、前記厚さＬ2 が１を越えると、前記開口部のコーナ部の加工性が低下する恐れがあるため、前記容器に歪みや凹み等の変形が生じる恐れがある。
【００１１】
【作用】
本発明の角形電池によれば、前述した（１）式を満たす構造を有する容器を備えることによって、前記容器の開口部の加工性を良好にすることができ、かつ前記容器の開口部の長手方向側の面の強度を向上することができる。その結果、前記容器の底部に歪みや凹み等の変形を生じさせることなく前記容器の開口部の上端を内方に折り曲げて折曲部を形成することができるため、前記容器内の折曲部と段部とにより囲まれた空間に封口板を絶縁ガスケットを介してかしめ固定することができる。従って、前記容器内のガス圧力が上昇した際に前記容器の開口部の長手方向側の面が外方に湾曲するのを抑制することができるため、前記電池の気密性を向上することができ、前記電池の信頼性を向上することが可能になる。
【００１２】
【実施例】
以下、本発明の実施例を図面を参照して詳細に説明する。
実施例１
図１に示すように、負極端子を兼ねる鋼製の容器１は有底矩形筒状で、上部に矩形枠状の開口部２を有する。前記容器１の前記開口部２の上端は内方に折り曲げられて折曲部３が形成されている。前記容器１の開口部２の下方には、内方に突出した形状の段部４が形成されている。前記容器１の段部４より下方に位置する部分の厚さ（Ｌ0 ）は例えば０．４０ｍｍで、前記開口部２の長手方向側の面の厚さ（Ｌ1 ）は例えば０．４３ｍｍである。図２に示すように前記容器１の前記開口部２の長手方向側と直交する面の厚さ（Ｌ2 ）は、例えば０．３７ｍｍである。従って、前記容器は前記（２）式を満たす構造を有する。前記胴部の厚さＬ0 を１とすると、前記厚さＬ1 は１．０７５で、前記厚さＬ2 は０．９２５である。また、前記容器１の開口部２のビッカース硬度は例えば１００Ｈｖで、段部４より下方に位置する部分のビッカース硬度は例えば１６０Ｈｖである。電極群５は、水素吸蔵合金負極６と袋状のポリアミド繊維製不織布からなるセパレータ７で包まれたニッケル正極８とを交互に重ね合わせて形成されている。前記電極群５は、前記容器１の内周面と前記負極６が接触するように前記容器１内に収納されている。７規定のＫＯＨ及び１規定のＬｉＯＨからなるアルカリ電解液は前記容器１内に収容されている。合成樹脂製の絶縁ガスケット９は、底部に矩形の穴９ａが開口された有底矩形筒状である。前記絶縁ガスケット９は、前記容器１内の前記折曲部３と前記段部４とにより囲まれた位置に圧縮状態で配置されている。防爆機能及び正極端子を兼ねる封口部材１０は、前記絶縁ガスケット９内に配置され、前記絶縁ガスケット９の反発弾性力によりかしめ固定されている。前記封口部材１０は、中央にガス抜き孔１１を有する矩形状の封口板１２と、例えば合成ゴムからなる弾性弁体１３と、ガス通過孔（図示しない）を有する帽子形の端子キャップ１４とから構成されている。前記弾性弁体１３は前記封口板１２にそのガス抜き孔１１を覆うように載置されている。前記端子キャップ１４は前記弾性弁体１３を包囲するように配置され、溶接により前記封口板１２に固定されている。正極リード１５は、一端が前記正極８に接続され、他端が前記封口板１２の下面と接続されている。
【００１３】
このような構成の角形ニッケル水素二次電池によれば、開口部２の長手方向側の面の厚さＬ1 と、長手方向と直交する面の厚さＬ2 とが前記（１）式を満たす構造を有する容器１を備えることによって、開口部２の長手方向側の面の強度を向上することができ、かつ前記容器１の開口部２の加工性を良好にすることができる。その結果、前記容器１の底部に歪みや凹み等の変形を生じさせることなく前記容器１の開口部２の上端を内方に折り曲げて折曲部３を形成することができるため、前記容器１内の折曲部３と段部４とにより囲まれた空間に封口部材１０を絶縁ガスケット９を介してかしめ固定することができる。従って、前記二次電池が急速充電されて前記容器１内のガス圧力が上昇した際に前記容器１の開口部２の長手方向側の面が外方に湾曲するのを抑制することができるため、前記電池の気密性を向上することができ、前記電池の信頼性を向上することが可能になる。
【００１４】
本発明に係わる角形電池の優れた特性は以下に示す実験により確認された。
実施例２
開口部の長手方向側の面の厚さＬ1 が０．４３ｍｍで、長手方向と直交する面の厚さＬ2 が０．４０ｍｍで，段部より下方に位置する部分の厚さＬ0 が０．４０ｍｍで、前記（２）式を満たす容器を用いた以外は実施例１と同様な構成の角形ニッケル水素二次電池を製造した。なお、前記胴部の厚さＬ0 を１とすると、前記厚さＬ1 は１．０７５で、前記厚さＬ2 は１である。
実施例３
開口部の長手方向側の面の厚さＬ1 が０．４３ｍｍで、長手方向と直交する面の厚さＬ2 が０．４０ｍｍで，段部より下方に位置する部分の厚さＬ0 が０．４３ｍｍで、前記（３）式を満たす容器を用いた以外は実施例１と同様な構成の角形ニッケル水素二次電池を製造した。なお、前記胴部の厚さＬ0 を１とすると、前記厚さＬ1 は１で、前記厚さＬ2 は約０．９３０である。
比較例１
開口部の面の厚さＬ1 ，Ｌ2 が０．４３ｍｍで、段部より下方に位置する部分の厚さＬ0 が０．４０ｍｍである構造を有し、かつ開口部のビッカース硬度が１００Ｈｖで、段部より下方に位置する部分のビッカース硬度が１６０Ｈｖである容器を用いた以外は実施例１と同様な構成の角形ニッケル水素二次電池を製造した。
比較例２
厚さが０．４０ｍｍで、かつ開口部のビッカース硬度が１００Ｈｖで、段部より下方に位置する部分のビッカース硬度が１６０Ｈｖである容器を用いた以外は実施例１と同様な構成の角形ニッケル水素二次電池を製造した。
【００１５】
実施例１〜３及び比較例１〜２の二次電池の容器の下部側面に孔を設け、この孔から前記容器内にガスを送りこみ、開口部と段部との間に位置する長手方向側内面と絶縁ガスケットとの間からガス漏れが生じた時の前記容器内の圧力を測定した。その結果を下記表１に示す。
【００１６】
【表１】
表１から明らかなように、前記（１）式を満たす構造を有する容器を備えた実施例１〜３の二次電池は、容器に変形がなく、ガス漏れが生じたときの電池内の圧力、つまり耐ガスリーク圧が高いことがわかる。これに対し、開口部の面の厚さが段部より下方に位置する部分に比べて厚い構造を有する容器を備えた比較例１の二次電池は、前記容器の底部に凹みが生じ、耐ガスリーク圧が低いことがわかる。厚さが全て等しい構造を有する容器を備えた比較例２の二次電池は、容器に変形がないものの耐ガスリーク圧が低いことがわかる。
【００１８】
なお、前記実施例では、角形ニッケル水素二次電池に適用した例を説明したが、角形ニッケルカドミウム二次電池にも同様に適用することができる。
前記実施例では、角形アルカリ二次電池に適用した例を説明したが、角形リチウムイオン二次電池、角形リチウム電池にも同様に適用することができる。
【００１９】
【発明の効果】
以上詳述したように本発明の角形電池によれば、加工性が優れ、長手方向側の面の強度が向上された開口部を有する容器を備え、前記容器内のガス圧力が上昇した際に前記開口部の長手方向側の面が外方に湾曲するのを抑制することができ、前記電池の気密性を向上することができるという顕著な効果を奏する。
【図面の簡単な説明】
【図１】本発明に係る角形電池を示す断面図。
【図２】図１のＡ−Ａ線に沿う断面図。
【符号の説明】
１…容器、２…開口部、３…折曲部、４…段部、５…電極群、９…絶縁ガスケット、１０…防爆機能及び端子を兼ねる封口部材、１２…封口板。[0001]
[Industrial application fields]
The present invention relates to a prismatic battery having a structure in which a sealing member is caulked and fixed via an insulating gasket at a position surrounded by a bent part and a step part in a bottomed rectangular cylindrical container.
[0002]
[Prior art]
In recent years, along with the reduction in size and weight of devices, development of rectangular batteries with high volumetric efficiency has been performed. As the prismatic batteries, prismatic alkaline secondary batteries such as prismatic nickel cadmium secondary batteries and prismatic nickel metal hydride secondary batteries are known. When the alkaline secondary battery is charged, oxygen gas is generated from the positive electrode at the end of charging. Since the generated oxygen gas is recombined and absorbed by the negative electrode, the internal pressure of the battery is maintained at a desired value. However, when the secondary battery is rapidly charged, the internal pressure of the battery rises due to the oxygen gas generated from the positive electrode. Since the secondary battery may burst if the battery internal pressure rises excessively, the secondary battery is provided with an explosion-proof function.
[0003]
A secondary battery having an explosion-proof function is manufactured by the following method. A bottomed rectangular tube-shaped container having a rectangular frame-shaped opening at the top and an inwardly projecting step formed below the opening is prepared. After accommodating the electrode group produced via the separator between the positive electrode and the negative electrode in the container, the alkaline electrolyte is accommodated. The sealing member is housed in a bottomed rectangular cylindrical insulating gasket having a rectangular hole at the bottom. This insulating gasket is placed on the step in the container, and the diameter of the opening is reduced. Subsequently, the upper end of the opening is bent inward to form a bent portion, and the sealing member is caulked and fixed in a space surrounded by the bent portion and the stepped portion to manufacture the secondary battery. . The sealing member includes a sealing plate having a gas venting hole, a cap-shaped terminal cap that is placed on the sealing plate so as to surround the gas venting hole, and has a gas passage hole, the sealing plate, and the terminal cap. And an elastic valve body made of synthetic rubber arranged so as to cover the gas vent hole.
[0004]
When gas is generated in the secondary battery having such a configuration and a gas pressure of a desired value is applied to the elastic valve body through the gas vent hole of the sealing plate, the valve body is deformed and lifted, so that the sealing A gap is generated between the plate and the valve body. As a result, the gas escapes to the outside through the gap and the gas passage hole of the terminal cap, thereby preventing rupture.
[0005]
By the way, in the secondary battery, for example, when gas is generated in the container due to rapid charging and the gas pressure rises, the gas pressure causes the longitudinal side surface of the opening of the container to curve outward. There was a problem. As a result, there is a problem that a gap is generated between the inner surface of the opening in the longitudinal direction and the insulating gasket, and the airtightness of the battery is lowered before the explosion-proof mechanism is operated.
[0006]
For this reason, the strength of the opening of the container is increased by increasing the hardness of the container or by increasing the thickness of the opening of the container. However, when the strength of the opening of the container is increased, the processability of the opening is inferior. Accordingly, in the secondary battery including the container, since the container is excessively pressed in the step of bending the upper end of the opening inward, a deformation such as a distortion or a dent is generated in the lower part of the container. There is a problem that it is difficult to attach the sealing member in an airtight manner.
[0007]
[Problems to be solved by the invention]
An object of the present invention is to provide a prismatic battery including a container having an opening with improved longitudinal strength and excellent workability.
[0008]
[Means for Solving the Problems]
The present invention is a container with a bottomed rectangular tube having a rectangular frame-shaped opening at the top and a stepped portion formed inwardly and formed below the opening, and is housed in the container. An electrode group produced via a separator between a positive electrode and a negative electrode, an electrolyte solution contained in the container, and placed on a step in the container to bend the upper end of the opening inward A bottomed rectangular cylindrical insulating gasket having a rectangular hole in the bottom portion disposed in a compressed state in a space surrounded by the stepped portion and the bent portion, and compression of the gasket disposed in the insulating gasket. in prismatic batteries and a sealing plate which is caulked and fixed in the lower, said container, the thickness of the longitudinal thickness direction side surface of the L 1, perpendicular to the longitudinal direction of the opening surface of the opening When L is L 2 , the following formula L 1 > L 2 (1)
It has the structure which satisfy | fills.
[0009]
The container has the following formula L 1 > L 0 ≧ L 2 (2) where L 0 is the thickness of the side surface located below the step.
Or L 1 = L 0 > L 2 (3)
It is preferable to have a structure satisfying A container having a structure satisfying the formula (2) or the formula (3) has a high strength at a portion located below the step portion and can accommodate an electrode group having a desired volume. Is preferable.
[0010]
When the container satisfies the formula (2) or the formula (3) and the thickness L 0 is 1, the thickness L 1 is 1 to 1.1, and the thickness L 2 is 0. .85 to 1 is preferable. This is due to the following reason. If the thickness L 1 is less than 1 , when the gas is generated in the battery and the internal pressure rises, the opening of the container may be easily bent outward, so that a desired sealing strength can be obtained. There is a risk of disappearing. On the other hand, if the thickness L 1 exceeds 1.1, the processability of the corner portion of the opening may be deteriorated, so that the container may be deformed such as distortion or dent. Further, when the thickness L 2 less than 0.85, the strength of the opening may be decreased, the deformation of the dent or distortion at the short sides of the container in the step of folding the upper end of the opening May occur. On the other hand, when the thickness L 2 exceeds 1, the processability of the corner portion of the opening may be decreased, there is a possibility that deformation distortion and dents on the container.
[0011]
[Action]
According to the prismatic battery of the present invention, by providing a container having a structure satisfying the above-described formula (1), the processability of the opening of the container can be improved, and the length of the opening of the container is increased. The strength of the direction side surface can be improved. As a result, the bent portion in the container can be formed by bending the upper end of the opening of the container inward without causing deformation such as distortion or dent in the bottom of the container. The sealing plate can be caulked and fixed via an insulating gasket in a space surrounded by the step portion. Accordingly, it is possible to prevent the surface on the longitudinal side of the opening of the container from being bent outward when the gas pressure in the container is increased, and thus the airtightness of the battery can be improved. The reliability of the battery can be improved.
[0012]
【Example】
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Example 1
As shown in FIG. 1, a steel container 1 that also serves as a negative electrode terminal has a bottomed rectangular tube shape, and has a rectangular frame-shaped
[0013]
According to the prismatic nickel metal hydride secondary battery having such a configuration, the thickness L 1 of the surface on the longitudinal direction side of the opening 2 and the thickness L 2 of the surface orthogonal to the longitudinal direction satisfy the above formula (1). By providing the container 1 having a filling structure, the strength of the surface on the longitudinal direction side of the
[0014]
The excellent characteristics of the prismatic battery according to the present invention were confirmed by the following experiment.
Example 2
The thickness L 1 of the surface on the longitudinal direction side of the opening is 0.43 mm, the thickness L 2 of the surface orthogonal to the longitudinal direction is 0.40 mm, and the thickness L 0 of the portion located below the step portion is A square nickel-metal hydride secondary battery having the same configuration as in Example 1 was manufactured except that a container satisfying the above-described expression (2) was used at 0.40 mm. When the thickness L 0 of the body portion is 1, the thickness L 1 is 1.075 and the thickness L 2 is 1.
Example 3
The thickness L 1 of the surface on the longitudinal direction side of the opening is 0.43 mm, the thickness L 2 of the surface orthogonal to the longitudinal direction is 0.40 mm, and the thickness L 0 of the portion located below the step portion is A square nickel-metal hydride secondary battery having the same configuration as in Example 1 was manufactured except that a container satisfying the above-described expression (3) was used at 0.43 mm. When the thickness L 0 of the body portion is 1, the thickness L 1 is 1 and the thickness L 2 is about 0.930.
Comparative Example 1
The thickness L 1 and L 2 of the surface of the opening is 0.43 mm, the thickness L 0 of the portion located below the stepped portion is 0.40 mm, and the Vickers hardness of the opening is 100 Hv Thus, a prismatic nickel metal hydride secondary battery having the same configuration as that of Example 1 was manufactured except that a container having a Vickers hardness of 160 Hv in a portion located below the stepped portion was used.
Comparative Example 2
A rectangular nickel metal hydride having the same configuration as in Example 1 except that a container having a thickness of 0.40 mm, a Vickers hardness of an opening of 100 Hv, and a Vickers hardness of 160 Hv of a portion located below the stepped portion is used. A secondary battery was manufactured.
[0015]
A hole is formed in the lower side surface of the containers of the secondary batteries of Examples 1 to 3 and Comparative Examples 1 and 2, and a gas is fed into the container through the hole, and the longitudinal direction is located between the opening and the stepped part. The pressure in the container was measured when a gas leak occurred between the side inner surface and the insulating gasket. The results are shown in Table 1 below.
[0016]
[Table 1]
As is clear from Table 1, the secondary batteries of Examples 1 to 3 provided with a container having a structure satisfying the formula (1) were not deformed in the container, and the pressure in the battery when a gas leak occurred. That is, it can be seen that the gas leak pressure resistance is high. On the other hand, the secondary battery of Comparative Example 1 having a container having a structure with a thicker surface than the part located below the stepped portion has a recess at the bottom of the container. It can be seen that the gas leak pressure is low. It can be seen that the secondary battery of Comparative Example 2 provided with a container having the same structure in all thicknesses has a low gas leak pressure resistance although the container is not deformed.
[0018]
In addition, although the example applied to the prismatic nickel metal hydride secondary battery has been described in the above embodiment, the present invention can be similarly applied to a prismatic nickel cadmium secondary battery.
Although the example applied to the prismatic alkaline secondary battery has been described in the above embodiment, the present invention can be similarly applied to a prismatic lithium ion secondary battery and a prismatic lithium battery.
[0019]
【The invention's effect】
As described above in detail, according to the prismatic battery of the present invention, when the gas pressure in the container is increased, the container having an opening having excellent workability and improved strength on the surface in the longitudinal direction is provided. It can suppress that the surface of the said opening part in the longitudinal direction side curves outside, and there exists a remarkable effect that the airtightness of the said battery can be improved.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a prismatic battery according to the present invention.
2 is a cross-sectional view taken along line AA in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Container, 2 ... Opening part, 3 ... Bending part, 4 ... Step part, 5 ... Electrode group, 9 ... Insulating gasket, 10 ... Sealing member which serves as an explosion-proof function and a terminal, 12 ... Sealing board.
Claims (1)
前記容器は、下記（２）式または（３）式を満足することを特徴とする角形電池。
Ｌ1＞Ｌ0≧Ｌ2 （２）
Ｌ1＝Ｌ0＞Ｌ2 （３）
Ｌ0は前記容器の前記段部より下方に位置する側面の厚さで、Ｌ1は前記容器の前記開口部の長手方向側の面の厚さで、Ｌ2は前記容器の前記開口部の長手方向と直交する面の厚さで、前記Ｌ 0 を１とした際に前記Ｌ 1 は１以上かつ１．１以下で、前記Ｌ 2 は０．８５以上かつ１以下である。 A rectangular tube-shaped container having a rectangular frame-shaped opening at the top and a stepped portion formed inwardly and formed below the opening; and housed in the container; a positive electrode and a negative electrode; An electrode group produced via a separator, an electrolytic solution accommodated in the container, and placed on the step in the container, and the upper end of the opening is bent inward to form the step. A bottomed rectangular cylindrical insulating gasket having a rectangular hole in the bottom portion disposed in a compressed state in a space surrounded by a bent portion and a bent portion, and disposed in the insulating gasket and fixed by caulking under compression of the gasket In the prismatic battery provided with a sealing plate,
The said container satisfies the following (2) Formula or (3) Formula, The square battery characterized by the above-mentioned.
L 1 > L 0 ≧ L 2 (2)
L 1 = L 0 > L 2 (3)
L 0 is the thickness of the side surface below the step of the container, L 1 is the thickness of the surface of the container on the longitudinal side, and L 2 is the thickness of the opening of the container. In terms of the thickness of the surface perpendicular to the longitudinal direction, when L 0 is 1, L 1 is 1 or more and 1.1 or less, and L 2 is 0.85 or more and 1 or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31814594A JP3662615B2 (en) | 1994-12-21 | 1994-12-21 | Square battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31814594A JP3662615B2 (en) | 1994-12-21 | 1994-12-21 | Square battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08180845A JPH08180845A (en) | 1996-07-12 |
| JP3662615B2 true JP3662615B2 (en) | 2005-06-22 |
Family
ID=18096003
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31814594A Expired - Fee Related JP3662615B2 (en) | 1994-12-21 | 1994-12-21 | Square battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3662615B2 (en) |
-
1994
- 1994-12-21 JP JP31814594A patent/JP3662615B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08180845A (en) | 1996-07-12 |
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