JP2004006117A - Battery - Google Patents

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Publication number
JP2004006117A
JP2004006117A JP2002159947A JP2002159947A JP2004006117A JP 2004006117 A JP2004006117 A JP 2004006117A JP 2002159947 A JP2002159947 A JP 2002159947A JP 2002159947 A JP2002159947 A JP 2002159947A JP 2004006117 A JP2004006117 A JP 2004006117A
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Japan
Prior art keywords
battery
sealing plate
gasket
terminal
positive electrode
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JP2002159947A
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JP3986368B2 (en
Inventor
Masaaki Kaneda
金田　正明
Kanehito Masumoto
増本　兼人
Norio Suzuki
鈴木　憲男
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Priority to JP2002159947A priority Critical patent/JP3986368B2/en
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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 provide a battery having a sealing plate to which, a gasket is formed by resin molding, having a structure of fixing a terminal member as well. <P>SOLUTION: A positive terminal 4 is arranged in a terminal-fitting hole 8 formed in the sealing plate 3, and joined to an axial part of the positive terminal 4, and the positive terminal 4 is fixed to the sealing plate 3 by filling and molding the resin which becomes a gasket 5 by joining with the necessary part on both surfaces of the sealing plate 3. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、発電要素を収容した電池缶の開口端を封口した封口板に正極又は負極の外部接続端子を設けた電池に関するものである。
【０００２】
【従来の技術】
電池における正極及び負極の外部接続端子の形成は、円筒形の電池の場合では、図４に示すように、発電要素を収容した電池缶６１の開口部をガスケット６３を介して封口する封口板６２が正極又は負極の外部接続端子に形成され、電池缶６１が封口板６２と対極する外部接続端子を構成している。この従来例はリチウムイオン二次電池と構成されたもので、封口板６２は、突出部が形成された端子板６８と、リング状のＰＴＣ素子６７と、防爆弁を構成する２枚の金属板６５、６６とを絶縁部材６９を介して結束板６４で一体化した安全構造を設けて構成されている。この封口板６２は電池缶６１の開口部にガスケット６３を介して配置され、電池缶６１の開口端を内側に折り曲げるカシメ加工によりガスケット６３を圧縮し、ガスケット６３により封口板６２を電池缶６１から絶縁すると共に、電池缶６１を密閉している。このような安全構造を設けない電池の場合においても、正極又は負極の外部接続端子とする封口板をガスケットを介してカシメ封口し、電池缶との絶縁と電池缶の密閉を図る構成は同様である。
【０００３】
角形の電池の場合では、前記カシメ加工による封口方法を用いると、角部で電池缶の開口端の折り曲げ部分が重なり合い、直線部でガスケットの圧縮が確実になされないために電池缶の密閉性が不充分となる。そこで、角形の電池においてカシメ加工による封口を可能にするためには、断面形状を長円形にすと共に直線部分の封口性を確実にする構造を設ける必要があった。より確実な封口を実現するために、角形の電池では電池缶の開口端に封口板の周囲をレーザー溶接することにより電池缶を封口し、封口板にガスケットを介して外部接続端子を取り付ける外部接続端子形成構造が採用されている。
【０００４】
図５は、扁平な角形に形成されたリチウムイオン二次電池の封口部分の例を断面図として示すものである。発電要素を収容した電池缶２２は、断面形状が長円形の有底筒状に形成され、その開口端には封口板２３がレーザー溶接されている。この二次電池２０の場合は、発電要素を構成する極板群２１の負極板が電池缶２２に接続されているため電池缶２２及び封口板２３は二次電池２０の負極の外部接続端子となる。正極の外部接続端子は封口板２３に対して上ガスケット２５ａ及び下ガスケット２５ｂにより絶縁して固定されたリベット２６に極板群２１の正極板から引き出された正極リード２４を接続することにより、前記リベット２６が担うように構成されている。
【０００５】
【発明が解決しようとする課題】
しかしながら、封口板２３に上下の各ガスケット２５ａ、２５ｂで絶縁してリベット２６を固定する構造は、構成部材数や組立工数が増加する課題があった。即ち、封口板２３に形成された貫通穴に対して封口板２３の両面から上ガスケット２５ａと下ガスケット２５ｂとを嵌め合わせ、上下ガスケット２５ａ，２５ｂの穴にリベット２６の軸部分を挿入し、リベット２６により上下ガスケット２５ａ，２５ｂを封口板２３に締結する工程が必要であるため、電池を製造するためのコストや工数を徒に増加させる。
【０００６】
本発明が目的とするところは、封口板にガスケットを介して端子部材を取り付ける構造を改良した封口板構造を備えた電池を提供することにある。
【０００７】
【課題を解決するための手段】
上記目的を達成するための本発明は、発電要素を収容した電池缶の開口端が封口板によって封口され、発電要素を構成する極板群の正極又は負極に接続された端子部材をガスケットにより前記封口板と絶縁し電池缶内の密閉性を保って電池缶内から外部に貫通させてなる電池であって、前記封口板に貫通穴が形成され、この貫通穴に電池缶内側から外部に貫通させた状態に前記端子部材が支持されるように、封口板両面の端子部材周面を含む所要範囲を被覆すると共に前記貫通穴に充填された樹脂モールド体によりガスケットが形成されてなることを特徴とする。
【０００８】
上記構成になる電池では、封口板の両面にわたって樹脂モールドによりガスケットが密着成形され、樹脂モールド時に封口板に形成された開口部を貫通させて端子部材が樹脂にインサート支持される。端子部材の電池缶内に位置する部分を極板群の正極板又は負極板に接続すると、端子部材の外部に露出する部分は電池の正極又は負極の端子として、電池缶及び封口板は端子部材に対極する極端子とすることができる。ガスケットは樹脂モールドによって形成され、同時に端子部材を固定するので、電池の正極端子又は負極端子を簡易に構成することができる。
【０００９】
【発明の実施の形態】
以下、添付図面を参照して本発明の実施形態について説明し、本発明の理解に供する。尚、以下に示す実施形態は本発明を具体化した一例であって、本発明の技術的範囲を限定するものではない。
【００１０】
図１は、本実施形態に係る電池１を断面図として示すもので、扁平な角形のリチウムイオン二次電池として構成されたものである。発電要素を収容した電池缶２は断面形状が長円形の有底筒状に形成され、その開口端は封口板３がレーザー溶接されることによって封口されている。封口板３にはガスケット５によって絶縁されて正極端子（端子部材）４が配設され、正極端子４の電池缶２内側には、極板群６を構成する正極板から引き出された正極リード７が接合されている。
【００１１】
前記封口板３に対する正極端子４の取り付けは、ガスケット５とする樹脂を封口板３に樹脂モールドすることによって固定される。樹脂モールドは、熱可塑性樹脂や熱硬化性樹脂を射出成形や注型する方法があるが、生産性や寸法精度の観点から耐電解液性がある熱可塑性樹脂を金型を用いて射出成形するのが好適である。耐電解液性がある熱可塑性樹脂としては、ポリエチレン樹脂やポリプロピレン樹脂などのポリオレフィン樹脂、ポリエチレンテレフタレート樹脂、ポリエーテルエーテルケトン樹脂、ポリフェニレンサルファイド樹脂、ポリアリレート樹脂、ポリアミド樹脂、ポリイミド樹脂などを挙げることができ、これらを単独又はブレンドした樹脂、変性した樹脂を用いることができる。また、これらの樹脂にガラス繊維、タルク、シリカなどの充填材を添加して用いることもできる。
【００１２】
図２に示すように、板材をプレス加工して長円形の外形に打ち抜くと共に、端子取付穴８及び注液口９を形成した封口板３は、図３に示すように、正極端子４が配置された金型１０内に所要部分が位置するようにセットされ、ガスケット５となる樹脂が金型１０内に射出される。樹脂は封口板３の両面及び正極端子４の所要部分に接合すると共に、正極端子４の軸部を包み込んで端子取付穴８内にも充填されるので、樹脂が固化して金型１０から取り出されたとき、封口板３に正極端子４がガスケット５を介して固定された状態が得られる。尚、封口板３や正極端子４等の金属部材は金型１０内で予熱した後、金型１０内に樹脂を射出することによって、樹脂と金属部材との密着性をより向上させることができる。
【００１３】
上記のようにガスケット５を介して正極端子が固定された封口板３を用いて、次のように電池１が組み立てられる。
【００１４】
封口板３にガスケット５により固着した正極端子４の下端側には、ワッシャ１１が嵌め込まれ、正極端子４をリベット状に締結することによりワッシャ１１を固定する。この正極端子４の締結によりガスケット５は封口板３に締めつけられ、より気密性が向上する。前記ワッシャ１１には、電池缶２内に収容された極板群６を構成する正極板から引き出された正極リード７の一端が溶接接合される。この封口板３は電池缶２の開口端に嵌め合わされ、封口板３の周囲と電池缶２の開口端との間がレーザー溶接によって接合され、電池缶２の開口部は封口される。正極リード７は電池缶２から離れた位置にある封口板３の正極端子４に届くように長めに引き出されているため、接合後に封口板３を電池缶２に嵌め合わせたとき、図１に示すように屈曲して封口板３に接触する恐れがあるが、封口板３の電池缶２内側となる面に成形されるガスケット５は、図示するように成形面積を一方側に広げて形成されているので、正極リード７が屈曲により封口板３に接触することが防止される。
【００１５】
この後、封口板３に開口する注液口９から電池缶２内に電解液が注入され、注液口９には図１に示すように封栓１２を嵌挿して蓋部分が封口板３に溶接されるので、電池缶２内は密閉状態となる。
【００１６】
上記のように、本実施形態に係る封口板３には樹脂成形により形成されたガスケット５によって正極端子４が封口板３と絶縁して固定されるので、封口板３に端子部材を固定する作業工程が簡略化されると共に、ガスケット５による電池缶２内の密閉性が向上し、漏液のない電池１に構成することができる。
【００１７】
以上説明した実施形態はリチウム二次電池に構成した例を示したが、一次電池、二次電池を問わず封口板に外部接続端子を取り付けた場合において、同様に構成することができる。
【００１８】
【発明の効果】
以上の説明の通り本発明によれば、封口板に形成された開口部を挟んで両面に樹脂成形によりガスケット５が形成され、ガスケットは端子部材を開口部を貫通させて封口板３と絶縁して固定されるので、封口板３に端子部材を固定する作業工程が簡略化されると共に、ガスケット５による電池缶２内の密閉性が向上し、漏液のない電池１に構成することができる。
【図面の簡単な説明】
【図１】実施形態に係る電池の構成を示す（ａ）は平面図、（ｂ）は断面図。
【図２】同上電池の封口板の構成を示す平面図。
【図３】同上封口板にガスケットを樹脂成形する状態を示す断面図。
【図４】従来技術に係る円筒形電池の構成を示す断面図。
【図５】従来技術に係る角形電池の構成を示す（ａ）は平面図、（ｂ）は断面図。
【符号の説明】
１　電池
２　電池缶
３　封口板
４　正極端子（端子部材）
５　ガスケット[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a battery in which a positive electrode or a negative electrode external connection terminal is provided on a sealing plate that seals an open end of a battery can containing a power generating element.
[0002]
[Prior art]
In the case of a cylindrical battery, the external connection terminals of the positive electrode and the negative electrode are formed by a sealing plate 62 for closing an opening of a battery can 61 containing a power generation element via a gasket 63 as shown in FIG. Is formed on the positive or negative external connection terminal, and the battery can 61 constitutes the external connection terminal opposite to the sealing plate 62. This conventional example is configured as a lithium ion secondary battery. The sealing plate 62 includes a terminal plate 68 having a protruding portion, a ring-shaped PTC element 67, and two metal plates forming an explosion-proof valve. A safety structure is provided, in which 65 and 66 are integrated with a binding plate 64 via an insulating member 69. The sealing plate 62 is arranged at the opening of the battery can 61 via a gasket 63, and compresses the gasket 63 by crimping to bend the opening end of the battery can 61 inward, and the sealing plate 62 is separated from the battery can 61 by the gasket 63. The battery can 61 is sealed while being insulated. Even in the case of a battery not provided with such a safety structure, a sealing plate serving as an external connection terminal of the positive electrode or the negative electrode is swaged and sealed via a gasket, and the configuration for insulating the battery can and sealing the battery can is the same. is there.
[0003]
In the case of a prismatic battery, if the sealing method by crimping is used, the bent portion of the open end of the battery can overlaps at the corner, and the gasket cannot be reliably compressed at the straight portion. Insufficient. Therefore, in order to enable sealing by a crimping process in a rectangular battery, it was necessary to provide a structure having an oval cross-sectional shape and ensuring the sealing performance of a straight line portion. In order to achieve more reliable sealing, for square batteries, the battery can is sealed by laser welding the periphery of the sealing plate to the opening end of the battery can, and the external connection terminal is attached to the sealing plate via a gasket. A terminal formation structure is employed.
[0004]
FIG. 5 is a cross-sectional view illustrating an example of a sealed portion of a lithium ion secondary battery formed in a flat rectangular shape. The battery can 22 containing the power generating element is formed in a bottomed cylindrical shape having an oval cross section, and a sealing plate 23 is laser-welded to an open end thereof. In the case of this secondary battery 20, since the negative electrode plate of the electrode plate group 21 constituting the power generating element is connected to the battery can 22, the battery can 22 and the sealing plate 23 are connected to the external connection terminal of the negative electrode of the secondary battery 20. Become. The external connection terminal of the positive electrode is connected to a rivet 26 insulated and fixed to the sealing plate 23 by an upper gasket 25a and a lower gasket 25b, and the positive electrode lead 24 drawn from the positive electrode plate of the electrode plate group 21 is connected to the rivet 26. The rivet 26 is configured to carry it.
[0005]
[Problems to be solved by the invention]
However, the structure in which the rivet 26 is fixed to the sealing plate 23 by insulating the upper and lower gaskets 25a and 25b with each other has a problem that the number of components and the number of assembly steps increase. That is, the upper gasket 25a and the lower gasket 25b are fitted into the through holes formed in the sealing plate 23 from both sides of the sealing plate 23, and the shaft portion of the rivet 26 is inserted into the holes of the upper and lower gaskets 25a, 25b. Since a step of fastening the upper and lower gaskets 25a and 25b to the sealing plate 23 is required by 26, the cost and man-hours for manufacturing the battery are unnecessarily increased.
[0006]
An object of the present invention is to provide a battery having a sealing plate structure in which a structure for attaching a terminal member to a sealing plate via a gasket is improved.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a battery can accommodating a power generating element, wherein an opening end is sealed by a sealing plate, and a terminal member connected to a positive electrode or a negative electrode of an electrode plate group constituting the power generating element is formed by a gasket. A battery which is insulated from the sealing plate and penetrates from the inside of the battery can to the outside while maintaining the tightness inside the battery can, wherein a through hole is formed in the sealing plate, and the through hole penetrates from the inside of the battery can to the outside. A gasket is formed by a resin mold body filled in the through hole and covering a required range including a peripheral surface of the terminal member on both sides of the sealing plate so that the terminal member is supported in the state where the terminal member is made to be in a state where the terminal member is supported. And
[0008]
In the battery having the above configuration, the gasket is closely formed by resin molding over both surfaces of the sealing plate, and the terminal member is insert-supported by the resin through the opening formed in the sealing plate during the resin molding. When the portion of the terminal member located inside the battery can is connected to the positive electrode plate or the negative electrode plate of the electrode group, the portion exposed to the outside of the terminal member serves as a positive or negative terminal of the battery, and the battery can and the sealing plate are connected to the terminal member. Can be used as the pole terminal opposite to. Since the gasket is formed by a resin mold and simultaneously fixes the terminal member, the positive electrode terminal or the negative electrode terminal of the battery can be easily configured.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings to facilitate understanding of the present invention. The embodiment described below is an example embodying the present invention, and does not limit the technical scope of the present invention.
[0010]
FIG. 1 is a cross-sectional view of a battery 1 according to the present embodiment, which is configured as a flat rectangular lithium ion secondary battery. The battery can 2 containing the power generating element is formed in a cylindrical shape with a bottom having an oblong cross section, and the opening end thereof is sealed by laser welding the sealing plate 3. A positive electrode terminal (terminal member) 4 is provided on the sealing plate 3 and insulated by a gasket 5. Inside the battery can 2 of the positive electrode terminal 4, a positive electrode lead 7 drawn from a positive electrode plate constituting the electrode plate group 6 is provided. Are joined.
[0011]
Attachment of the positive electrode terminal 4 to the sealing plate 3 is fixed by resin-molding a resin to be the gasket 5 on the sealing plate 3. The resin mold has a method of injection molding or casting a thermoplastic resin or a thermosetting resin, but from the viewpoint of productivity and dimensional accuracy, a thermoplastic resin having an electrolytic solution resistance is injection molded using a mold. Is preferred. Examples of the thermoplastic resin having electrolyte resistance include polyolefin resins such as polyethylene resin and polypropylene resin, polyethylene terephthalate resin, polyether ether ketone resin, polyphenylene sulfide resin, polyarylate resin, polyamide resin, and polyimide resin. These resins can be used alone or as a blend or a modified resin. Further, a filler such as glass fiber, talc, silica or the like can be added to these resins and used.
[0012]
As shown in FIG. 2, the plate material is stamped into an elliptical outer shape by press working, and the sealing plate 3 in which the terminal mounting holes 8 and the liquid inlets 9 are formed, as shown in FIG. The resin to be the gasket 5 is injected into the mold 10 so that a required portion is located in the mold 10 thus set. The resin is bonded to both sides of the sealing plate 3 and a required portion of the positive electrode terminal 4, and at the same time, wraps around the shaft portion of the positive electrode terminal 4 and fills the terminal mounting hole 8, so that the resin is solidified and removed from the mold 10. Then, a state is obtained in which the positive electrode terminal 4 is fixed to the sealing plate 3 via the gasket 5. The metal members such as the sealing plate 3 and the positive electrode terminal 4 are preheated in the mold 10 and then the resin is injected into the mold 10 to further improve the adhesion between the resin and the metal member. .
[0013]
Using the sealing plate 3 to which the positive electrode terminal is fixed via the gasket 5 as described above, the battery 1 is assembled as follows.
[0014]
A washer 11 is fitted to the lower end side of the positive electrode terminal 4 fixed to the sealing plate 3 by the gasket 5, and the washer 11 is fixed by fastening the positive electrode terminal 4 in a rivet shape. The gasket 5 is fastened to the sealing plate 3 by the fastening of the positive electrode terminal 4, and the airtightness is further improved. One end of a positive electrode lead 7 pulled out from a positive electrode plate constituting the electrode plate group 6 accommodated in the battery can 2 is welded to the washer 11. The sealing plate 3 is fitted to the opening end of the battery can 2, the periphery of the sealing plate 3 and the opening end of the battery can 2 are joined by laser welding, and the opening of the battery can 2 is sealed. Since the positive electrode lead 7 is extended so as to reach the positive electrode terminal 4 of the sealing plate 3 at a position away from the battery can 2, when the sealing plate 3 is fitted to the battery can 2 after joining, as shown in FIG. Although the gasket 5 formed on the surface of the sealing plate 3 which is on the inside of the battery can 2 may be bent as shown in FIG. This prevents the positive electrode lead 7 from contacting the sealing plate 3 due to bending.
[0015]
Thereafter, an electrolytic solution is injected into the battery can 2 from a liquid inlet 9 opened in the sealing plate 3, and a plug 12 is inserted into the liquid inlet 9 as shown in FIG. Therefore, the inside of the battery can 2 is sealed.
[0016]
As described above, since the positive electrode terminal 4 is insulated and fixed to the sealing plate 3 according to the present embodiment by the gasket 5 formed by resin molding, the operation of fixing the terminal member to the sealing plate 3 is performed. The process is simplified, and the gasket 5 improves the hermeticity of the battery can 2 so that the battery 1 can be constructed without any liquid leakage.
[0017]
Although the embodiment described above shows an example in which a lithium secondary battery is configured, the same configuration can be applied to a case where an external connection terminal is attached to a sealing plate regardless of a primary battery or a secondary battery.
[0018]
【The invention's effect】
As described above, according to the present invention, the gasket 5 is formed by resin molding on both sides of the opening formed in the sealing plate, and the gasket insulates the terminal member from the sealing plate 3 by penetrating the opening. As a result, the operation process of fixing the terminal member to the sealing plate 3 is simplified, and the gasket 5 improves the hermeticity of the battery can 2 so that the battery 1 does not leak. .
[Brief description of the drawings]
FIG. 1A is a plan view showing a configuration of a battery according to an embodiment, and FIG.
FIG. 2 is a plan view showing a configuration of a sealing plate of the battery.
FIG. 3 is a sectional view showing a state in which a gasket is resin-molded on the sealing plate.
FIG. 4 is a cross-sectional view showing a configuration of a cylindrical battery according to the related art.
5A is a plan view and FIG. 5B is a cross-sectional view showing a configuration of a prismatic battery according to the related art.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Battery 2 Battery can 3 Sealing plate 4 Positive electrode terminal (terminal member)
5 Gasket

Claims (1)

発電要素を収容した電池缶の開口端が封口板によって封口され、発電要素を構成する極板群の正極又は負極に接続された端子部材をガスケットにより前記封口板と絶縁し電池缶内の密閉性を保って電池缶内から外部に貫通させてなる電池であって、
前記封口板に貫通穴が形成され、この貫通穴に電池缶内側から外部に貫通させた状態に前記端子部材が支持されるように、封口板両面の端子部材周面を含む所要範囲を被覆すると共に前記貫通穴に充填された樹脂モールド体によりガスケットが形成されてなることを特徴とする電池。The open end of the battery can housing the power generating element is sealed by a sealing plate, and the terminal member connected to the positive electrode or the negative electrode of the electrode plate group constituting the power generating element is insulated from the sealing plate by a gasket to seal the inside of the battery can. The battery is made to penetrate from inside the battery can to
A through-hole is formed in the sealing plate, and covers a required area including the peripheral surfaces of the terminal members on both surfaces of the sealing plate so that the terminal member is supported in a state where the through-hole is penetrated from the inside of the battery can to the outside. And a gasket formed of a resin mold body filled in the through hole.
JP2002159947A 2002-05-31 2002-05-31 battery Expired - Lifetime JP3986368B2 (en)

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WO2006123720A1 (en) * 2005-05-17 2006-11-23 Honda Motor Co., Ltd. Storage battery and insulator and battery-use container using them
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