JP4599675B2 - Sealed secondary battery - Google Patents

Sealed secondary battery Download PDF

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Publication number
JP4599675B2
JP4599675B2 JP2000212179A JP2000212179A JP4599675B2 JP 4599675 B2 JP4599675 B2 JP 4599675B2 JP 2000212179 A JP2000212179 A JP 2000212179A JP 2000212179 A JP2000212179 A JP 2000212179A JP 4599675 B2 JP4599675 B2 JP 4599675B2
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Prior art keywords
sealing plate
cylindrical case
cylindrical
sealing
ring
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JP2002025601A (en
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誠一 上本
登志一 浦
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Panasonic Corp
Panasonic Holdings Corp
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Panasonic Corp
Matsushita Electric Industrial Co Ltd
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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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Description

【０００１】
【発明の属する技術分野】
本発明は、非水電解液二次電池などの密閉型二次電池に関するものである。
【０００２】
【従来の技術】
近年、地球環境問題、あるいはエネルギー問題を解決する手段として、リチウムイオン二次電池の開発が盛んに行われている。地球環境を良好に保全しつつ電力の安定確保を図っていく方策の一つとして負荷の平準化技術の実用化が望まれているが、一般家庭などで小規模に夜間電力を貯蔵する電池電力貯蔵装置を普及させると、大きな負荷平準化効果が期待できる。また、自動車の排気ガスによる大気汚染やＣＯ2 による温暖化防止を図るために、動力源の全部又は一部を二次電池によって得るようにした電気自動車の普及も望まれている。
【０００３】
このため、家庭用の電池電力貯蔵装置や電気自動車の動力源として、帯状の正極板と帯状の負極板をセパレータを介して対向させた状態で円筒芯体に渦巻き状に巻回し、電解液とともに円筒型外容器内に密封収納した、単電池容量が１００Ａｈ程度の大型のリチウムイオン二次電池の開発が行われている。
【０００４】
この種の密閉型二次電池の密閉容器構造としては、筒状ケースの両端を封口板で閉鎖して溶接したものや、例えば特開平８−２５００８４号公報や、特開平９−５５２１３号公報に開示されているように、筒状ケースの端部にビード加工を施してリング状の電気絶縁ガスケットを装着するとともにその内周に封口板を取付けた後、筒状ケースの端部をかしめてこれら電気絶縁ガスケットと封口板を固定して封口したものが知られている。
【０００５】
【発明が解決しようとする課題】
ところで、筒状ケースの両端に封口板を溶接して密封した電池容器においては、気密性を確保するためには溶接条件の安定が要求され、加工条件がばらつくと気密性が確保できないという問題があり、特に軽量化を図るためにアルミニウムを用いた場合、アルミニウムは溶接が困難で、溶接強度も弱く、気密性を確保しかつ必要な強度を確保した信頼性の高い溶接を安定して行うのは困難であるという問題がある。
【０００６】
また、上記公報で開示されたように筒状ケースの端部内周と封口板の外周との間に環状のガスケットを介在させ、筒状ケースをかしめて密封する場合には、ガスケットの圧縮率を高くしないと、シール性が確保できず、圧縮率が高いとガスケットが圧縮破壊したり、経時変化で収縮してシール性が確保できなくなり、長期にわたって信頼性の高いシール性を確保することができないという問題がある。
【０００７】
本発明は、上記従来の問題点に鑑み、電池加工時の加工品質で気密性能が左右されず、信頼性の高いシール性を確保できる密閉型二次電池を提供することを目的としている。
【０００８】
本発明の密閉型二次電池は、筒状ケース内に極板群を配設し、両端が開口した筒状ケースの両端を封口板にて密閉した密閉型二次電池において、
前記筒状ケースの端部から所定長だけ内周径を大きくした薄肉筒部と、
前記薄肉筒部に嵌合され、外周部に突出する肉厚部の外周面にＯリングが装着された環状溝が形成された封口板を有し、
前記封口板の外周部の上下面が前記薄肉筒部と前記筒状ケースの内周径の差で形成された
段部と、前記薄肉筒部の端部がかしめられたかしめ部で挟持されるので、筒状ケースや封口板の部品形状で密封性能を確保でき、電池組み付け加工時の溶接条件やかしめ品質などの加工品質で気密性能が左右されず、信頼性の高いシール性を確保することができる。
【０００９】
また、封口板の外周にＯリングを装着する環状溝を形成すると、重量軽減のために薄肉に形成されている筒状ケース側にビード加工などの塑性加工によって溝を形成する必要がなく、一方封口板の外周部に環状溝を形成しても外周部だけ厚肉にすればよいので重量増加は少なく、かつ溝形成も容易であるため、容易かつ低コストにて製造できる。
【００１０】
また、筒状ケースの封口板による封口端部の端縁部をかしめて封口板を固定すると、シール性に影響することなく、簡単に封口板を固定することができる。
【００１１】
また、筒状ケースの封口板による封口端部の内周に、封口板の筒状ケース内側に向く面の外周縁部が係合する段部を形成すると、封口板の位置決め及び固定を簡単にできる。
【００１２】
また、筒状ケースの封口板による封口端部を内周側から削って薄肉に形成し、薄肉端部をかしめて封口板を固定すると、かしめによる封口板の固定を簡単に行うことができる。
【００１３】
また、筒状ケース及び封口板はアルミニウムにて構成すると、軽量化を図ることができる。
【００１４】
また、封口板に、電池端子を貫通配置するとともに絶縁手段とＯリングを介して装着固定すると、電池端子を封口板との間で絶縁できるとともにＯリングにて端子部でのシール性も確保できる。
【００１５】
【発明の実施の形態】
以下、本発明の密閉型二次電池の一実施形態について、図１〜図３を参照して説明する。
【００１６】
１は、帯状の正極板と負極板をポリエチレン製のセパレータを介して互いに対向された状態で、アルミパイプから成る円筒芯体２の外周に渦巻き状に巻回された極板群である。
【００１７】
極板群１はアルミニウムパイプから成る筒状ケース３内に電解液とともに挿入配置されている。極板群１の両端部外周には断面形状略Ｌ字状の絶縁リング４が嵌着され、この絶縁リング４の外周が筒状ケース３内周に嵌合されて極板群１が支持されている。筒状ケース３は、極板群１の両端に嵌合した絶縁リング４の外側端間が相対的に厚肉で、それより外側の両端部分は段部５を介して内周径の大きな薄肉筒部６にて構成されている。
【００１８】
筒状ケース３の両端開口は、薄肉筒部６内に嵌合するアルミニウム製のダイキャスト製品から成る封口板７にて閉鎖されている。封口板７の外周部には、両側に突出する厚肉部８が設けられ、その外周面に環状溝９が形成されている。環状溝９内にはＯリング１０が装着され、このＯリング１０を装着した状態の封口板７が薄肉筒部６に嵌合され、封口板７の外周縁部が段部５に係合するまで押し込まれている。その状態で薄肉筒部６の封口板７から突出した部分が内周側に向けてかしめられ、かしめ部１１にて封口板７が筒状ケース３に固定されている。また、この状態でＯリング１０は筒状ケース３の薄肉筒部６の内周面にて圧縮されて所定のシール性能を発揮している。
【００１９】
封口板７の軸芯部には装着穴１２が穿孔され、短軸状の電池端子１３が貫通させて装着されている。この電池端子１３の電池内側の端部には、装着穴１２の径よりもかなり大きな外径の座板部１４が形成され、座板部１４と封口板７との間には、シール用のＯリング１５とその配置空間外周を規制する絶縁板１６が介装され、また電池端子１３の外周と装着穴１２の内周との間には筒状絶縁体１７が介装され、この筒状絶縁体１７の座板部１４側の端部外周にはＯリング１５の配置空間内周を規制する鍔部１７ａが突設されている。また、封口板７の外側面の内周部には筒状絶縁体１７の外周に連続するように絶縁板１８が配置され、この絶縁板１８の上に配置された座金１９が電池端子１３の外周に内周縁が係合固定可能なクランプリング２０にて押圧固定されている。かくして、電池端子１３は、絶縁板１６、筒状絶縁体１７及び絶縁板１８を介して絶縁を確保しかつＯリング１５でシール性を確保した状態で、座板部１４と座金１９の間で封口板７を挟持することによって封口板７の軸芯部に固定されている。電池端子１３の座板部１４には極板群１から延出された集電体２１が電気的に接続されている。
【００２０】
以上の構成によれば、筒状ケース３と封口板７の間の密封構成として、筒状ケース３の内周と封口板７の外周の間でＯリング１０を所定の圧縮率で圧縮してシールするようにしているので、筒状ケース３や封口板７の形状によって密封性能を確保することができ、電池組み付け加工時の溶接条件やかしめ品質などの加工品質で気密性能が左右されないために、信頼性の高いシール性を確保することができる。特に、封口板７の外周にＯリング１０を装着する環状溝９を形成しているので、重量軽減のために薄肉となっている筒状ケース３側にビード加工などの塑性加工が必要でないため、Ｏリング１０を装着するための環状溝９を容易かつ低コストにて形成できる。一方、そのために封口板７に厚肉部８を形成する必要があるが、外周部だけでよいので重量増加は少なくて済み、また筒状ケース３及び封口板７がアルミニウム製であるので、軽量化を図ることができる。
【００２１】
また、筒状ケース３の内周に、封口板７の外周縁部が係合する段部５を形成するとともにそれよりも外側を薄肉筒部６としているので、封口板７を簡単に位置決めでき、かつその状態で薄肉筒部６をかしめることによってシール性に影響することなく、簡単に封口板７を固定することができる。
【００２２】
また、封口板７に、絶縁板１６、筒状絶縁体１７、及び絶縁板１８を介して電池端子１３を貫通配置するとともに、それらの間にＯリング１５を介装した状態で装着固定しているので、電池端子１３を封口板７との間で絶縁できるとともにＯリング１５にて端子部でのシール性も確保できる。
【００２３】
なお、上記実施形態では、封口板７の外周にＯリング１０を装着する環状溝９を形成した例を示したが、筒状ケース３側に塑性加工によってＯリング装着用の環状溝を形成してもよい。また、封口板７側に形成する場合にも、筒状部を有する薄板製の封口板７を用いてその筒状部に塑性加工によって環状溝を形成してもよい。また、封口板７の押し込み位置を規制する段部５を筒状ケース３の肉厚の変化で形成した例を示したが、筒状ケース３の板厚は一定にして塑性加工にて段部５を形成してもよい。また、筒状ケース３や封口板７の材質もスチールやステンレス鋼を用いることもできるが、アルミニウムが軽量で好適である。
【００２４】
【発明の効果】
本発明の密閉型二次電池によれば、以上の説明から明らかなように、筒状ケース内周と封口板外周の間にＯリングを介装し、筒状ケース内周と封口板外周の間でＯリングを所定の圧縮率で圧縮してシールするようにしたので、溶接条件やかしめ品質などの加工品質で気密性能が左右されず、信頼性の高いシール性を確保することができる。
【００２５】
また、封口板の外周にＯリングを装着する環状溝を形成すると、重量軽減のために薄肉の筒状ケース側に溝を形成するビード加工などの塑性加工が必要でなく、一方封口板の外周部を厚肉にして環状溝を形成しても重量増加は少なく、かつ溝形成も容易であるため、容易かつ低コストにて製造できる。
【００２６】
また、筒状ケースの封口板による封口端部の端縁部をかしめて封口板を固定すると、シール性に影響することなく、簡単に封口板を固定することができる。
【００２７】
また、筒状ケースの封口板による封口端部の内周に、封口板の筒状ケース内側に向く面の外周縁部が係合する段部を形成すると、封口板の位置決め及び固定を簡単にできる。
【００２８】
また、筒状ケースの封口板による封口端部を内周側から削って薄肉に形成し、薄肉端部をかしめて封口板を固定すると、かしめによる封口板の固定を簡単に行うことができる。
【００２９】
また、筒状ケース及び封口板はアルミニウムにて構成すると、軽量化を図ることができる。
【００３０】
また、封口板に、電池端子を貫通配置するとともに絶縁材とＯリングを介して装着固定すると、電池端子を封口板との間で絶縁できるとともにＯリングにて端子部でのシール性も確保できる。
【図面の簡単な説明】
【図１】本発明の密閉型二次電池の一実施形態の縦断面図である。
【図２】図１の側面図である。
【図３】同実施形態の要部の拡大縦断面図である。
【符号の説明】
１ 極板群
３ 筒状ケース
５ 段部
６ 薄肉筒部
７ 封口板
９ 環状溝
１０ Ｏリング
１１ かしめ部
１３ 電池端子
１５ Ｏリング
１６ 絶縁板
１７ 筒状絶縁体
１８ 絶縁板[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sealed secondary battery such as a non-aqueous electrolyte secondary battery.
[0002]
[Prior art]
In recent years, lithium ion secondary batteries have been actively developed as means for solving global environmental problems or energy problems. As one of the measures to ensure stable power supply while preserving the global environment well, it is hoped that the load leveling technology will be put into practical use. If storage devices are spread, a large load leveling effect can be expected. In addition, in order to prevent air pollution due to automobile exhaust gas and global warming due to CO 2, it is also desired to spread electric vehicles in which all or part of a power source is obtained by a secondary battery.
[0003]
For this reason, as a power source for household battery power storage devices and electric vehicles, a strip-shaped positive electrode plate and a strip-shaped negative electrode plate are wound around a cylindrical core body in a state of facing each other via a separator, together with an electrolytic solution Development of a large-sized lithium ion secondary battery having a single battery capacity of about 100 Ah and hermetically housed in a cylindrical outer container has been underway.
[0004]
As a sealed container structure of this type of sealed secondary battery, a case in which both ends of a cylindrical case are closed and sealed with a sealing plate, for example, Japanese Patent Laid-Open Nos. 8-250084 and 9-55213 are disclosed. As disclosed, bead processing is applied to the end of the cylindrical case, a ring-shaped electrical insulating gasket is attached, a sealing plate is attached to the inner periphery, and the end of the cylindrical case is then crimped. What sealed the electric insulation gasket and the sealing board is known.
[0005]
[Problems to be solved by the invention]
By the way, in a battery case in which sealing plates are welded and sealed at both ends of the cylindrical case, it is required to stabilize the welding conditions in order to ensure airtightness, and there is a problem that airtightness cannot be ensured if the processing conditions vary. Yes, especially when aluminum is used to reduce the weight, it is difficult to weld, the welding strength is weak, airtightness is secured, and reliable welding with the required strength is performed stably. There is a problem that is difficult.
[0006]
In addition, as disclosed in the above publication, an annular gasket is interposed between the inner periphery of the end of the cylindrical case and the outer periphery of the sealing plate, and when the cylindrical case is caulked and sealed, the compression rate of the gasket is If it is not increased, the sealing performance cannot be ensured. If the compression ratio is high, the gasket may be compressed and broken, or it will shrink due to changes over time and the sealing performance cannot be secured, so that a reliable sealing performance cannot be secured for a long time. There is a problem.
[0007]
In view of the above-described conventional problems, an object of the present invention is to provide a sealed secondary battery in which the airtight performance is not affected by the processing quality at the time of battery processing and a highly reliable sealing performance can be secured.
[0008]
The sealed secondary battery of the present invention is a sealed secondary battery in which an electrode plate group is disposed in a cylindrical case, and both ends of the cylindrical case opened at both ends are sealed with sealing plates.
A thin cylindrical portion having an inner circumferential diameter increased from the end of the cylindrical case by a predetermined length;
Having a sealing plate in which an annular groove fitted with an O-ring is formed on the outer peripheral surface of the thick portion that is fitted to the thin-walled cylindrical portion and protrudes to the outer peripheral portion;
The upper and lower surfaces of the outer peripheral portion of the sealing plate are formed by the difference in inner peripheral diameter between the thin cylindrical portion and the cylindrical case.
Since the stepped part and the end of the thin-walled cylindrical part are clamped by the caulked part , the sealing performance can be ensured by the shape of the parts of the cylindrical case and the sealing plate, welding conditions at the time of battery assembly processing, caulking quality, etc. The airtight performance is not affected by the processing quality, and a highly reliable sealing property can be secured.
[0009]
In addition, when an annular groove for mounting an O-ring is formed on the outer periphery of the sealing plate, it is not necessary to form a groove by plastic processing such as bead processing on the thin cylindrical case side for weight reduction. Even if the annular groove is formed in the outer peripheral portion of the sealing plate, it is only necessary to make the outer peripheral portion thick, so that the weight increase is small, and the groove can be easily formed, so that it can be manufactured easily and at low cost.
[0010]
Further, when the sealing plate is fixed by caulking the edge portion of the sealing end portion by the sealing plate of the cylindrical case, the sealing plate can be easily fixed without affecting the sealing performance.
[0011]
In addition, if the outer peripheral edge of the surface of the sealing plate facing the inside of the cylindrical case is formed on the inner periphery of the sealing end of the cylindrical case, the sealing plate can be easily positioned and fixed. it can.
[0012]
Further, when the sealing end of the cylindrical case by the sealing plate is shaved from the inner peripheral side to form a thin wall, and the sealing plate is fixed by caulking the thin end, the sealing plate can be easily fixed by caulking.
[0013]
Further, when the cylindrical case and the sealing plate are made of aluminum, the weight can be reduced.
[0014]
In addition, when the battery terminal is disposed through the sealing plate and is fixed through the insulating means and the O-ring, the battery terminal can be insulated from the sealing plate and the sealing performance at the terminal portion can be secured by the O-ring. .
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a sealed secondary battery of the present invention will be described with reference to FIGS.
[0016]
Reference numeral 1 denotes an electrode plate group wound in a spiral shape around the outer periphery of a cylindrical core body 2 made of an aluminum pipe with a belt-like positive electrode plate and a negative electrode plate facing each other with a polyethylene separator interposed therebetween.
[0017]
The electrode plate group 1 is inserted and disposed together with the electrolyte in a cylindrical case 3 made of an aluminum pipe. An insulating ring 4 having a substantially L-shaped cross section is fitted to the outer periphery of both ends of the electrode plate group 1, and the outer periphery of the insulating ring 4 is fitted to the inner periphery of the cylindrical case 3 to support the electrode plate group 1. ing. The cylindrical case 3 has a relatively thick portion between the outer ends of the insulating ring 4 fitted to both ends of the electrode plate group 1, and both end portions outside the thin ring having a large inner peripheral diameter via the step portion 5. It is comprised by the cylinder part 6. FIG.
[0018]
Both end openings of the cylindrical case 3 are closed by a sealing plate 7 made of an aluminum die-cast product fitted into the thin-walled cylindrical portion 6. On the outer peripheral part of the sealing plate 7, a thick part 8 protruding on both sides is provided, and an annular groove 9 is formed on the outer peripheral surface. An O-ring 10 is mounted in the annular groove 9, the sealing plate 7 with the O-ring 10 mounted is fitted into the thin-walled cylindrical portion 6, and the outer peripheral edge of the sealing plate 7 is engaged with the stepped portion 5. Is pushed in. In this state, a portion protruding from the sealing plate 7 of the thin tube portion 6 is caulked toward the inner peripheral side, and the sealing plate 7 is fixed to the cylindrical case 3 by the caulking portion 11. In this state, the O-ring 10 is compressed on the inner peripheral surface of the thin cylindrical portion 6 of the cylindrical case 3 and exhibits a predetermined sealing performance.
[0019]
A mounting hole 12 is drilled in the shaft core portion of the sealing plate 7, and a short-axis battery terminal 13 is inserted therethrough. A seat plate portion 14 having an outer diameter that is considerably larger than the diameter of the mounting hole 12 is formed at the end of the battery terminal 13 inside the battery. Between the seat plate portion 14 and the sealing plate 7, a sealing plate is used. An insulating plate 16 that restricts the outer periphery of the O-ring 15 and its arrangement space is interposed, and a cylindrical insulator 17 is interposed between the outer periphery of the battery terminal 13 and the inner periphery of the mounting hole 12. On the outer periphery of the end portion of the insulator 17 on the side of the seat plate portion 14, a flange portion 17 a that regulates the inner periphery of the arrangement space of the O-ring 15 is provided. Further, an insulating plate 18 is disposed on the inner peripheral portion of the outer surface of the sealing plate 7 so as to be continuous with the outer periphery of the cylindrical insulator 17, and a washer 19 disposed on the insulating plate 18 is connected to the battery terminal 13. The inner periphery is pressed and fixed to the outer periphery by a clamp ring 20 that can be engaged and fixed. Thus, the battery terminal 13 is provided between the seat plate portion 14 and the washer 19 in a state in which insulation is ensured through the insulating plate 16, the cylindrical insulator 17, and the insulating plate 18, and sealing is secured by the O-ring 15. By sandwiching the sealing plate 7, it is fixed to the shaft core portion of the sealing plate 7. A current collector 21 extending from the electrode plate group 1 is electrically connected to the seat plate portion 14 of the battery terminal 13.
[0020]
According to the above configuration, as a sealing configuration between the cylindrical case 3 and the sealing plate 7, the O-ring 10 is compressed at a predetermined compression ratio between the inner periphery of the cylindrical case 3 and the outer periphery of the sealing plate 7. Since sealing is performed, the sealing performance can be ensured by the shape of the cylindrical case 3 and the sealing plate 7, and the airtight performance is not affected by the processing conditions such as welding conditions and caulking quality at the time of battery assembly processing. Highly reliable sealability can be ensured. In particular, since the annular groove 9 for mounting the O-ring 10 is formed on the outer periphery of the sealing plate 7, plastic processing such as bead processing is not necessary on the thin cylindrical case 3 side for weight reduction. The annular groove 9 for mounting the O-ring 10 can be formed easily and at low cost. On the other hand, it is necessary to form the thick portion 8 on the sealing plate 7 for that purpose, but since only the outer peripheral portion is required, the weight increase is small, and the cylindrical case 3 and the sealing plate 7 are made of aluminum, so that the weight is light. Can be achieved.
[0021]
Moreover, since the step part 5 which the outer peripheral edge part of the sealing board 7 engages is formed in the inner periphery of the cylindrical case 3, and the outer side is made into the thin-walled cylindrical part 6, it can position the sealing board 7 easily. In addition, the sealing plate 7 can be easily fixed without affecting the sealing performance by caulking the thin cylindrical portion 6 in this state.
[0022]
In addition, the battery terminal 13 is disposed through the sealing plate 7 through the insulating plate 16, the cylindrical insulator 17, and the insulating plate 18, and the O-ring 15 is interposed between them and fixed. Therefore, the battery terminal 13 can be insulated from the sealing plate 7 and the O-ring 15 can also ensure the sealing performance at the terminal portion.
[0023]
In the above embodiment, an example in which the annular groove 9 for mounting the O-ring 10 is formed on the outer periphery of the sealing plate 7 is shown. However, an annular groove for mounting the O-ring is formed on the cylindrical case 3 side by plastic working. May be. Moreover, when forming in the sealing plate 7 side, you may form an annular groove by plastic working in the cylindrical part using the sealing plate 7 made from a thin plate which has a cylindrical part. Moreover, although the example which formed the step part 5 which regulates the pushing position of the sealing board 7 by the change of the thickness of the cylindrical case 3 was shown, the plate | board thickness of the cylindrical case 3 was made constant and a step part was formed by plastic processing. 5 may be formed. Moreover, although the material of the cylindrical case 3 and the sealing board 7 can also use steel and stainless steel, aluminum is lightweight and suitable.
[0024]
【The invention's effect】
According to the sealed secondary battery of the present invention, as is clear from the above description, an O-ring is interposed between the inner periphery of the cylindrical case and the outer periphery of the sealing plate, and the inner periphery of the cylindrical case and the outer periphery of the sealing plate are inserted. Since the O-ring is compressed and sealed at a predetermined compression rate, the hermetic performance is not affected by the processing quality such as welding conditions and caulking quality, and a highly reliable sealing property can be secured.
[0025]
Further, if an annular groove for mounting an O-ring is formed on the outer periphery of the sealing plate, plastic processing such as bead processing for forming a groove on the thin cylindrical case side is not necessary for weight reduction, while the outer periphery of the sealing plate is Even if the annular groove is formed with a thicker portion, the weight increase is small and the groove can be easily formed, so that it can be manufactured easily and at low cost.
[0026]
Further, when the sealing plate is fixed by caulking the edge portion of the sealing end portion by the sealing plate of the cylindrical case, the sealing plate can be easily fixed without affecting the sealing performance.
[0027]
In addition, if the outer peripheral edge of the surface of the sealing plate facing the inside of the cylindrical case is formed on the inner periphery of the sealing end of the cylindrical case, the sealing plate can be easily positioned and fixed. it can.
[0028]
Further, when the sealing end of the cylindrical case by the sealing plate is shaved from the inner peripheral side to form a thin wall, and the sealing plate is fixed by caulking the thin end, the sealing plate can be easily fixed by caulking.
[0029]
Further, when the cylindrical case and the sealing plate are made of aluminum, the weight can be reduced.
[0030]
Further, when the battery terminal is disposed through the sealing plate and is fixedly attached via an insulating material and an O-ring, the battery terminal can be insulated from the sealing plate and the sealing performance at the terminal portion can be secured by the O-ring. .
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an embodiment of a sealed secondary battery of the present invention.
FIG. 2 is a side view of FIG.
FIG. 3 is an enlarged longitudinal sectional view of a main part of the same embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Electrode plate group 3 Cylindrical case 5 Step part 6 Thin-walled cylinder part 7 Sealing plate 9 Annular groove 10 O-ring 11 Caulking part 13 Battery terminal 15 O-ring 16 Insulating board 17 Cylindrical insulator 18 Insulating board

Claims (4)

筒状ケース内に極板群を配設し、両端が開口した筒状ケースの両端を封口板にて密閉した密閉型二次電池において、
前記筒状ケースの端部から所定長だけ内周径を大きくした薄肉筒部と、
前記薄肉筒部に嵌合され、外周部に突出する肉厚部の外周面にＯリングが装着された環状溝が形成された封口板を有し、
前記封口板の外周部の上下面が前記薄肉筒部と前記筒状ケースの内周径の差で形成された段部と、前記薄肉筒部の端部がかしめられたかしめ部で挟持された密閉型二次電池。In a sealed secondary battery in which an electrode plate group is arranged in a cylindrical case and both ends of the cylindrical case opened at both ends are sealed with sealing plates,
A thin cylindrical portion having an inner circumferential diameter increased from the end of the cylindrical case by a predetermined length;
Having a sealing plate in which an annular groove fitted with an O-ring is formed on the outer peripheral surface of the thick portion that is fitted to the thin-walled cylindrical portion and protrudes to the outer peripheral portion;
The upper and lower surfaces of the outer peripheral portion of the sealing plate are sandwiched between a stepped portion formed by a difference in inner peripheral diameter between the thin cylindrical portion and the cylindrical case, and an end portion of the thin cylindrical portion is clamped by a caulking portion. Sealed secondary battery. 前記筒状ケースの前記薄肉筒部より筒中心側に断面形状略Ｌ字状の絶縁リングが嵌合され、前記絶縁リングには極板群の端部外周が嵌着された請求項１記載の密閉型二次電池。The insulating ring having a substantially L-shaped cross section is fitted to the cylindrical center side of the thin cylindrical portion of the cylindrical case, and the outer periphery of the end portion of the electrode plate group is fitted to the insulating ring. Sealed secondary battery. 筒状ケース及び封口板はアルミニウムから成ることを特徴とする請求項１〜２の何れかに記載の密閉型二次電池。Sealed secondary battery according to any one of claims 1-2 cylindrical case and the sealing plate is characterized in that it consists of aluminum. 封口板に、電池端子を貫通配置するとともに絶縁手段とＯリングを介して装着固定したことを特徴とする請求項１〜３の何れかに記載の密閉型二次電池。The sealed secondary battery according to any one of claims 1 to 3 , wherein a battery terminal is disposed through the sealing plate and is fixedly attached through an insulating means and an O-ring.
JP2000212179A 2000-07-13 2000-07-13 Sealed secondary battery Expired - Fee Related JP4599675B2 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0696748A (en) * 1992-09-11 1994-04-08 Matsushita Electric Ind Co Ltd Elliptical sealed battery
JP2000030675A (en) * 1998-07-14 2000-01-28 Hitachi Ltd Secondary battery
JP2000138054A (en) * 1998-10-30 2000-05-16 Sanyo Electric Co Ltd Cylindrical secondary battery

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JPH1173944A (en) * 1997-08-28 1999-03-16 Mitsubishi Pencil Co Ltd Negative electrode for lithium ion secondary battery and its manufacture
JPH11176396A (en) * 1997-12-10 1999-07-02 Sanyo Electric Co Ltd Cylindrical battery

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0696748A (en) * 1992-09-11 1994-04-08 Matsushita Electric Ind Co Ltd Elliptical sealed battery
JP2000030675A (en) * 1998-07-14 2000-01-28 Hitachi Ltd Secondary battery
JP2000138054A (en) * 1998-10-30 2000-05-16 Sanyo Electric Co Ltd Cylindrical secondary battery

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