JP2004119329A - Secondary battery - Google Patents

Secondary battery Download PDF

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Publication number
JP2004119329A
JP2004119329A JP2002284806A JP2002284806A JP2004119329A JP 2004119329 A JP2004119329 A JP 2004119329A JP 2002284806 A JP2002284806 A JP 2002284806A JP 2002284806 A JP2002284806 A JP 2002284806A JP 2004119329 A JP2004119329 A JP 2004119329A
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JP
Japan
Prior art keywords
battery
elastic
injection hole
seat
liquid injection
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JP2002284806A
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Japanese (ja)
Inventor
Atsuhiro Funabashi
Hideo Hagino
Naoya Nakanishi
Toshiyuki Noma
Koichi Sato
Hiroshi Sawada
Atsushi Yanai
中西 直哉
佐和田 博
佐藤 広一
柳井 敦志
能間 俊之
船橋 淳浩
萩野 秀雄
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Sanyo Electric Co Ltd
三洋電機株式会社
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Priority to JP2002284806A priority Critical patent/JP2004119329A/en
Publication of JP2004119329A publication Critical patent/JP2004119329A/en
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Abstract

<P>PROBLEM TO BE SOLVED: To provide a secondary battery in which a structure of closing a liquid pouring hole of the battery can maintain the high airtightness for a long period. <P>SOLUTION: In the secondary battery, the battery can is provided with the liquid pouring hole 6 for pouring the electrolyte in the assembling process, which is a hole having steps. The liquid pouring hole 6 has a seat surface 62 facing the outside of the battery can, on which seat surface 62 a projected ridge 63 is formed surrounding the liquid pouring hole 6 and extending over the whole circumference thereof, and on which seat surface 62 an elastic member 2 is placed. A metal plate 3 is disposed outside the elastic member 2, and welded to a lid 12 of the battery can in the state that the elastic member 2 is being pressed against the seat surface 62. <P>COPYRIGHT: (C)2004,JPO

Description

【0001】
【発明の属する技術分野】
本発明は、電池缶の内部に二次電池要素となる電極体を収容して、電池缶に設けられた一対の電極端子部から電極体の発生電力を取り出すことが出来る二次電池に関するものである。
【0002】
【従来の技術】
近年、携帯型電子機器の電源として、エネルギー密度の高いリチウム二次電池が注目されている。又、電気自動車の電源として、大容量の円筒型二次電池が注目されている。
従来の円筒型リチウムイオン二次電池は、図19に示す如く、筒体(11)の各開口部に蓋体(12)を溶接固定して電池缶(1)を形成し、該電池缶(1)の内部に巻き取り電極体(4)を設置して構成されており、該巻き取り電極体(4)の発生電力を、両蓋体(12)(12)に取り付けた正負一対の電極端子機構(9)(9)から外部に取り出すことが可能となっている。 In the conventional cylindrical lithium ion secondary battery, as shown in FIG. 19, a lid body (12) is welded and fixed to each opening of the tubular body (11) to form a battery can (1), and the battery can (1) is formed. A take-up electrode body (4) is installed inside 1), and the generated power of the take-up electrode body (4) is applied to a pair of positive and negative electrodes attached to both lid bodies (12) and (12). It can be taken out from the terminal mechanisms (9) and (9).
【0003】 0003
蓋体(12)には、電池缶(1)内の圧力が所定値を越えたときにガスを排出するガス排出弁(8)が取り付けられている。 A gas discharge valve (8) for discharging gas when the pressure in the battery can (1) exceeds a predetermined value is attached to the lid (12). 該ガス排出弁(8)は、弁膜(82)の外周部にリング体(81)を固定してなり、該リング体(81)の外周部が、蓋体(12)に開設した貫通孔(13)の開口縁に溶接されている。 The gas discharge valve (8) has a ring body (81) fixed to the outer peripheral portion of the valve membrane (82), and the outer peripheral portion of the ring body (81) has a through hole (12) formed in the lid body (12). It is welded to the opening edge of 13).
又、蓋体(12)には、電池組立工程にて電解液を注入するための注液孔(14)が開設され、該注液孔(14)には金属栓(15)がねじ込まれて、封口が施されている。 Further, the lid body (12) is provided with a liquid injection hole (14) for injecting an electrolytic solution in the battery assembly process, and a metal stopper (15) is screwed into the liquid injection hole (14). , The seal is given.
【0004】 0004
巻き取り電極体(4)は、リチウム複合酸化物を含む正極と、炭素材料を含む負極との間に、非水電解液が含浸されたセパレータを介在させて、これらを渦巻き状に巻回して構成されている。 In the take-up electrode body (4), a separator impregnated with a non-aqueous electrolytic solution is interposed between a positive electrode containing a lithium composite oxide and a negative electrode containing a carbon material, and these are spirally wound. It is configured. 該巻き取り電極体(4)の両端部にはそれぞれ円板状の集電板(5)が溶接され、該集電板(5)がリード部材(55)を介して電極端子機構(9)の基端部に接続されている。 Disk-shaped current collectors (5) are welded to both ends of the take-up electrode body (4), and the current collectors (5) are connected to the electrode terminal mechanism (9) via a lead member (55). It is connected to the base end of.
【0005】 0005
上述の如き二次電池において、注液孔を塞ぐ構造としては、注液孔にゴム栓を嵌合せしめると共に、該ゴム栓を覆って金属製封孔体本体を設置し、該金属製封孔体本体を電池容器に溶接固定した構造(特許文献2)や、注液孔をシート材で塞ぐと共に、該シート材を覆って金属製の注液栓を設置し、該注液栓をケース本体に溶接固定した構造(特許文献3)が提案されている。 In the secondary battery as described above, as a structure for closing the liquid injection hole, a rubber stopper is fitted into the liquid injection hole, and a metal sealing body main body is installed to cover the rubber stopper, and the metal sealing hole is provided. A structure in which the main body is welded and fixed to a battery container (Patent Document 2), a liquid injection hole is closed with a sheet material, and a metal injection plug is installed to cover the sheet material, and the liquid injection plug is used as a case main body. (Patent Document 3) has been proposed.
【0006】 0006
【特許文献1】 [Patent Document 1]
特開2000−149902号公報【特許文献2】 Japanese Unexamined Patent Publication No. 2000-149902 [Patent Document 2]
特開2001−313022号公報【特許文献3】 Japanese Unexamined Patent Publication No. 2001-313022 [Patent Document 3]
特開2000−215883号公報【0007】 Japanese Unexamined Patent Publication No. 2000-215883
【発明が解決しようとする課題】 [Problems to be Solved by the Invention]
しかしながら、図19の如く蓋体(12)の注液孔(14)に金属栓(15)をねじ込む封口構造では、電池の長期間の使用において、ねじ面間の気密性を高く維持することが困難であり、気密性の低下によって電池缶(1)の内部に水分が混入すると、電池の性能低下を招くことになる。 However, in the sealing structure in which the metal stopper (15) is screwed into the liquid injection hole (14) of the lid (12) as shown in FIG. 19, the airtightness between the screw surfaces can be maintained high during long-term use of the battery. It is difficult, and if water is mixed into the battery can (1) due to a decrease in airtightness, the performance of the battery is deteriorated.
そこで、金属栓(15)を蓋体(12)に溶接して、溶接部によって気密性を確保することが考えられるが、溶接時の熱が電池缶内に伝わって、有機溶媒が蒸発することになるので、該有機溶媒が溶接部に付着して、溶接不良を引き起こす虞がある。 Therefore, it is conceivable to weld the metal stopper (15) to the lid (12) to ensure airtightness by the welded portion, but the heat at the time of welding is transferred to the inside of the battery can and the organic solvent evaporates. Therefore, the organic solvent may adhere to the welded portion and cause welding failure.
【0008】 0008
又、注液孔をゴム栓と金属製封孔体本体によって塞ぐ構造(特許文献2)や、注液孔をシート材と注液栓によって塞ぐ構造(特許文献3)においては、ゴム栓やシート材が密着することとなる注液孔の内周面や開口縁表面を、高い精度で平面に仕上げることによって、溶接時のシール性を高いものとする必要があるが、特に大型電池においては、平面に仕上げるべきエリアが広くなるため、その全域に亘って高い仕上げ精度を得ることは困難である。 Further, in a structure in which the liquid injection hole is closed by a rubber stopper and a metal sealing body body (Patent Document 2) and a structure in which the liquid injection hole is closed by a sheet material and a liquid injection plug (Patent Document 3), the rubber stopper or the sheet is used. It is necessary to improve the sealing performance at the time of welding by finishing the inner peripheral surface of the liquid injection hole and the surface of the opening edge to which the material adheres to each other with high accuracy, but especially in a large battery. Since the area to be finished on a flat surface becomes wide, it is difficult to obtain high finishing accuracy over the entire area. 従って、電池缶の気密性を維持するためには、金属製封孔体本体や注液栓の溶接部に高い気密性が必要となるが、溶接部にはピンホールやクラックが存在する虞があるため、気密性の維持は困難である。 Therefore, in order to maintain the airtightness of the battery can, high airtightness is required in the welded portion of the metal sealing body body and the liquid injection plug, but there is a possibility that pinholes and cracks may exist in the welded portion. Therefore, it is difficult to maintain airtightness.
【0009】 0009
そこで本発明の目的は、電池缶の注液孔を塞ぐ構造において高い気密性を長期間に亘って維持することが出来る二次電池を提供することである。 Therefore, an object of the present invention is to provide a secondary battery capable of maintaining high airtightness for a long period of time in a structure that closes a liquid injection hole of a battery can.
【0010】 0010
【課題を解決する為の手段】 [Means for solving problems]
本発明に係る二次電池は、金属製の電池缶の内部に、電解液が含浸された電極体を収容して構成されている。 The secondary battery according to the present invention is configured by accommodating an electrode body impregnated with an electrolytic solution inside a metal battery can.
電池缶には、組立工程にて電解液を注入するための注液孔が開設され、該注液孔は段付き孔であって、その段差部に電池缶の外側に向いた座面を有し、該座面には、注液孔を包囲して全周を伸びる凸条部が形成され、該座面に弾性部材が設置されると共に、該弾性部材の外側には金属板が設置され、該金属板は、弾性部材を前記座面に押し付けた状態で、電池缶に固定されている。 The battery can is provided with a liquid injection hole for injecting an electrolytic solution in the assembly process, and the liquid injection hole is a stepped hole, and the stepped portion has a seating surface facing the outside of the battery can. Then, a convex portion that surrounds the liquid injection hole and extends all around is formed on the seat surface, an elastic member is installed on the seat surface, and a metal plate is installed on the outside of the elastic member. The metal plate is fixed to the battery can with the elastic member pressed against the seat surface.
【0011】 0011
具体的には、前記凸条部は、電池缶の製造工程にて削り出しによって形成されている。 Specifically, the convex portion is formed by carving in the manufacturing process of the battery can. 又、金属板は、電池缶に対して溶接若しくはねじ込みによって固定されている。 Further, the metal plate is fixed to the battery can by welding or screwing.
【0012】 [0012]
上記本発明の二次電池においては、弾性部材が座面に押し付けられることによって、座面に形成されている凸条部が弾性部材に食い込んで、該凸条部の表面と弾性部材の表面とが互いに強く圧着し、両者間に高いシール性が得られる。 In the secondary battery of the present invention, when the elastic member is pressed against the seat surface, the convex portion formed on the seat surface bites into the elastic member, and the surface of the convex portion and the surface of the elastic member Are strongly crimped to each other, and high sealing performance can be obtained between them. 従って、座面の他の領域における仕上げ精度が多少低く、該領域と弾性部材の間の密着性が低くとも、前記凸条部における高いシール性により、座面と弾性部材の間には、全体として高いシール性が長期間に亘って確保される。 Therefore, even if the finishing accuracy in the other region of the seat surface is somewhat low and the adhesion between the region and the elastic member is low, the high sealing property in the convex portion provides the entire space between the seat surface and the elastic member. High sealing performance is ensured for a long period of time.
【0013】 0013
従って、金属板を電池缶に溶接によって固定する場合、シール性は、金属板よりも内側の弾性部材と座面との間で確保されているので、溶接時の熱によって蒸発した有機溶媒が溶接部に付着する虞はなく、よって溶接不良を引き起こす虞はない。 Therefore, when the metal plate is fixed to the battery can by welding, the sealing property is ensured between the elastic member inside the metal plate and the seat surface, so that the organic solvent evaporated by the heat during welding is welded. There is no risk of adhering to the portion, and therefore there is no risk of causing welding defects. 又、溶接部にクラックやピンホールが存在したとしても、電池缶の気密性に問題はない。 Further, even if there are cracks or pinholes in the welded portion, there is no problem in the airtightness of the battery can.
【0014】 0014.
又、本発明に係る他の二次電池において、電池缶には、組立工程にて電解液を注入するための注液孔が開設され、該注液孔の内周面には、注液孔を包囲して全周を伸びる1或いは複数条の凸条部が形成され、該注液孔に弾性部材が圧入されて、該弾性部材の外周面が注液孔の内周面に押し付けられている。 Further, in the other secondary battery according to the present invention, the battery can is provided with a liquid injection hole for injecting the electrolytic solution in the assembly process, and the liquid injection hole is formed on the inner peripheral surface of the liquid injection hole. One or more convex portions extending around the entire circumference are formed, an elastic member is press-fitted into the liquid injection hole, and the outer peripheral surface of the elastic member is pressed against the inner peripheral surface of the liquid injection hole. There is.
【0015】 0015.
具体的構成において、前記凸条部は、電池缶の製造工程にて削り出しによって形成されている。 In a specific configuration, the convex portion is formed by carving in the manufacturing process of the battery can. 又、弾性部材の外側には金属板が設置され、該金属板は溶接又はねじ込みによって電池缶に固定されている。 Further, a metal plate is installed on the outside of the elastic member, and the metal plate is fixed to the battery can by welding or screwing.
【0016】 0016.
上記本発明の二次電池においては、弾性部材が注液孔に圧入されることによって、注液孔の内周面に形成されている凸条部が弾性部材に食い込んで、該凸条部の表面と弾性部材の表面とが互いに強く圧着し、両者間に高いシール性が得られる。 In the above-mentioned secondary battery of the present invention, when the elastic member is press-fitted into the liquid injection hole, the convex portion formed on the inner peripheral surface of the liquid injection hole bites into the elastic member, and the convex portion of the convex portion The surface and the surface of the elastic member are strongly pressure-bonded to each other, and high sealing performance can be obtained between them. 従って、注液孔内周面の他の領域における仕上げ精度が多少低く、該領域と弾性部材の間の密着性が低くとも、前記凸条部における高いシール性により、注液孔内周面と弾性部材の間には、全体として高いシール性が長期間に亘って維持される。 Therefore, even if the finishing accuracy in the other region of the inner peripheral surface of the liquid injection hole is slightly low and the adhesion between the region and the elastic member is low, the high sealing property in the convex portion allows the inner peripheral surface of the liquid injection hole to be formed. High sealing performance as a whole is maintained between the elastic members for a long period of time.
【0017】 [0017]
従って、金属板を電池缶に溶接によって固定する場合、シール性は、金属板よりも内側の弾性部材と注液孔内周面との間で確保されているので、溶接時の熱によって蒸発した有機溶媒が溶接部に付着する虞はなく、よって溶接不良を引き起こす虞はない。 Therefore, when the metal plate is fixed to the battery can by welding, the sealing property is ensured between the elastic member inside the metal plate and the inner peripheral surface of the liquid injection hole, so that the metal plate evaporates due to the heat during welding. There is no risk of the organic solvent adhering to the weld, and thus there is no risk of causing poor welding. 又、溶接部にクラックやピンホールが存在したとしても、電池缶の気密性に問題はない。 Further, even if there are cracks or pinholes in the welded portion, there is no problem in the airtightness of the battery can.
【0018】 0018
更に具体的な構成において、弾性部材の中央部に開設された穴には、軸体が嵌入して、弾性部材を膨張させることにより、弾性部材の外周面を注液孔の内周面に押圧している。 In a more specific configuration, the shaft body is fitted into the hole formed in the central portion of the elastic member to expand the elastic member, thereby pressing the outer peripheral surface of the elastic member against the inner peripheral surface of the liquid injection hole. doing. 該具体的構成によれば、注液孔内周面と弾性部材の間の圧着度を更に高めることが出来る。 According to the specific configuration, the degree of pressure bonding between the inner peripheral surface of the liquid injection hole and the elastic member can be further increased.
【0019】 0019
尚、前記弾性部材は、エチレンプロピレンゴム、フッ素樹脂、シリコンゴム、又はブチルゴムから形成されている。 The elastic member is made of ethylene propylene rubber, fluororesin, silicon rubber, or butyl rubber. これらの材質は、耐電解液性を有し、長期間の使用によっても弾力性が低下することがないので、長期間に亘って高いシール性が維持される。 Since these materials have electrolytic solution resistance and their elasticity does not decrease even after long-term use, high sealing properties are maintained for a long period of time.
【0020】 0020
【発明の効果】 【Effect of the invention】
本発明に係る二次電池によれば、注液孔を高いシール性で塞ぐことによって電池缶の気密性を長期間に亘って維持することが出来る。 According to the secondary battery according to the present invention, the airtightness of the battery can can be maintained for a long period of time by closing the liquid injection hole with a high sealing property.
【0021】 0021.
【発明の実施の形態】 BEST MODE FOR CARRYING OUT THE INVENTION
以下、本発明を円筒型リチウムイオン二次電池に実施した形態につき、図面に沿って具体的に説明する。 Hereinafter, embodiments of the present invention implemented in a cylindrical lithium ion secondary battery will be specifically described with reference to the drawings.
【0022】 0022.
第1実施例 First Example
本実施例の円筒型リチウムイオン二次電池は、図1に示す如く、アルミニウム製の筒体(11)の各開口部に、アルミニウム製の蓋体(12)をレーザ溶接により固定して、気密性を有する電池缶(1)を形成し、該電池缶(1)の内部には巻き取り電極体(4)が収容されている。 As shown in FIG. 1, the cylindrical lithium-ion secondary battery of this embodiment is airtight by fixing an aluminum lid (12) to each opening of an aluminum cylinder (11) by laser welding. A battery can (1) having a property is formed, and a take-up electrode body (4) is housed inside the battery can (1). 又、電池缶(1)の両蓋体(12)(12)には、正負一対の電極端子機構(9)(9)が取り付けられており、巻き取り電極体(4)が発生する電力を外部に取り出すことが可能となっている。 Further, a pair of positive and negative electrode terminal mechanisms (9) and (9) are attached to both lids (12) and (12) of the battery can (1) to generate electric power generated by the take-up electrode body (4). It is possible to take it out.
【0023】 [0023]
電池缶(1)の蓋体(12)には貫通孔(13)が開設され、該貫通孔(13)には、電池缶(1)内の圧力が所定値を越えたときにガスを排出するガス排出弁(8)が固定されている。 A through hole (13) is provided in the lid (12) of the battery can (1), and gas is discharged into the through hole (13) when the pressure in the battery can (1) exceeds a predetermined value. The gas discharge valve (8) is fixed. 該ガス排出弁(8)は、弁膜(82)の外周部にリング体(81)を固定してなり、該リング体(81)の外周部が、蓋体(12)に開設した貫通孔(13)の開口縁に溶接されている。 The gas discharge valve (8) has a ring body (81) fixed to the outer peripheral portion of the valve membrane (82), and the outer peripheral portion of the ring body (81) has a through hole (12) formed in the lid body (12). It is welded to the opening edge of 13).
又、蓋体(12)には、組立工程で電解液を注入するための注液孔(6)が開設され、該注液孔(6)は、後述する弾性部材(2)と金属板(3)によって塞がれている。 Further, the lid body (12) is provided with a liquid injection hole (6) for injecting an electrolytic solution in the assembly process, and the liquid injection hole (6) is formed by an elastic member (2) and a metal plate (6) described later. It is blocked by 3).
【0024】 0024
巻き取り電極体(4)の両端部にはそれぞれ集電板(5)が設置され、該集電板(5)が巻き取り電極体(4)に金属溶射若しくはレーザ溶接により接合されている。 Current collector plates (5) are installed at both ends of the take-up electrode body (4), and the current collector plates (5) are joined to the take-up electrode body (4) by metal spraying or laser welding. 該集電板(5)の端部に突設されたリード部(55)の先端は、電極端子機構(9)を構成する電極端子(91)の鍔部(92)に、スポット溶接、超音波溶接或いはレーザ溶接によって接合されている。 The tip of the lead portion (55) projecting from the end portion of the current collector plate (5) is spot welded to the flange portion (92) of the electrode terminal (91) constituting the electrode terminal mechanism (9). It is bonded by sonic welding or laser welding.
【0025】 0025
電極端子機構(9)は、電池缶(1)の蓋体(12)を貫通して取り付けられた電極端子(91)を具え、該電極端子(91)の基端部には鍔部(92)が形成されている。 The electrode terminal mechanism (9) includes an electrode terminal (91) attached through the lid (12) of the battery can (1), and a collar portion (92) is attached to the base end portion of the electrode terminal (91). ) Is formed. 蓋体(12)の貫通孔には絶縁パッキング(93)が装着され、蓋体(12)と締結部材(91)の間の電気的絶縁性とシール性が保たれている。 An insulating packing (93) is attached to the through hole of the lid (12) to maintain electrical insulation and sealing between the lid (12) and the fastening member (91). 電極端子(91)には、蓋体(12)の外側からワッシャ(94)が嵌められると共に、第1ナット(95)及び第2ナット(96)が螺合している。 A washer (94) is fitted to the electrode terminal (91) from the outside of the lid (12), and a first nut (95) and a second nut (96) are screwed together. そして、第1ナット(95)を締め付けて、電極端子(91)の鍔部(92)とワッシャ(94)によって絶縁パッキング(93)を挟圧することにより、シール性を高めている。 Then, the first nut (95) is tightened, and the insulating packing (93) is sandwiched between the flange portion (92) of the electrode terminal (91) and the washer (94) to improve the sealing property.
【0026】 0026
巻き取り電極体(4)は、図2に示す如く、アルミニウム箔からなる芯体(45)の表面にリチウム複合酸化物からなる正極活物質(44)を塗布してなる正極(41)と、銅箔からなる芯体(47)の表面に炭素材料を含む負極活物質(46)を塗布してなる負極(43)と、非水電解液が含浸されたセパレータ(42)とから構成され、正極(41)及び負極(43)はそれぞれセパレータ(42)上に幅方向へずらして重ね合わされ、渦巻き状に巻き取られている。 As shown in FIG. 2, the take-up electrode body (4) includes a positive electrode (41) formed by coating a positive electrode active material (44) made of a lithium composite oxide on the surface of a core body (45) made of aluminum foil. It is composed of a negative electrode (43) formed by coating a negative electrode active material (46) containing a carbon material on the surface of a core body (47) made of copper foil, and a separator (42) impregnated with a non-aqueous electrolytic solution. The positive electrode (41) and the negative electrode (43) are respectively stacked on the separator (42) so as to be displaced in the width direction, and are wound in a spiral shape. これによって、巻き取り電極体(4)の巻き軸方向の両端部の内、一方の端部では、セパレータ(42)の端縁よりも外方へ正極(41)の芯体(45)の端縁(48)が突出すると共に、他方の端部では、セパレータ(42)の端縁よりも外方へ負極(43)の芯体(47)の端縁(48)が突出している。 As a result, at one end of both ends of the take-up electrode body (4) in the winding axis direction, the end of the core body (45) of the positive electrode (41) is outward from the edge of the separator (42). The edge (48) protrudes, and at the other end, the edge (48) of the core body (47) of the negative electrode (43) protrudes outward from the edge of the separator (42).
【0027】 [0027]
集電板(5)は円板状の本体(51)を具え、該円板状本体(51)には、中央孔(54)が開設されている。 The current collector plate (5) includes a disk-shaped main body (51), and the disk-shaped main body (51) is provided with a central hole (54). 円板状本体(51)には、中央孔(54)を中心として放射状に伸びる複数条の円弧状凸部(52)が一体成型され、巻き取り電極体(4)側に突出している。 A plurality of arcuate convex portions (52) extending radially around the central hole (54) are integrally molded in the disk-shaped main body (51), and project toward the take-up electrode body (4). 又、円板状本体(51)には、隣接する円弧状凸部(52)(52)の間にそれぞれ、複数条の切り起し片(53)が形成され、巻き取り電極体(4)側に突出している。 Further, in the disk-shaped main body (51), a plurality of cut-out pieces (53) are formed between adjacent arc-shaped convex portions (52) and (52), respectively, and the take-up electrode body (4) It protrudes to the side. 更に、円板状本体(51)の端部には、短冊状のリード部(55)が一体に形成されている。 Further, a strip-shaped lead portion (55) is integrally formed at the end portion of the disk-shaped main body (51).
尚、集電板(5)の円弧状凸部(52)は、円板状本体(51)の半径線に直交する断面形状が半円の円弧を呈している。 The arcuate convex portion (52) of the current collector plate (5) has an arc shape having a semicircular cross section orthogonal to the radius line of the disc-shaped main body (51).
【0028】 [0028]
上記集電板(5)を作製した後、巻き取り電極体(4)の各端部に形成されている芯体端縁(48)に集電板(5)を押し付ける。 After producing the current collector plate (5), the current collector plate (5) is pressed against the core body edge (48) formed at each end of the take-up electrode body (4). これによって、集電板(5)の円弧状凸部(52)は、巻き取り電極体(4)の芯体端縁(48)に食い込み、円弧状凸部(52)と芯体端縁(48)の間には、円筒面からなる接合面が形成される。 As a result, the arcuate convex portion (52) of the current collector plate (5) bites into the core body end edge (48) of the take-up electrode body (4), and the arcuate convex portion (52) and the core body end edge ( A joint surface made of a cylindrical surface is formed between 48). 又、集電板(5)の切り起し片(53)は、巻き取り電極体(4)の芯体端縁(48)に深く食い込み、芯体端縁(48)と圧着することになる。 Further, the cut-up piece (53) of the current collector plate (5) deeply bites into the core body edge (48) of the take-up electrode body (4) and is crimped to the core body edge (48). ..
この状態で、集電板(5)の円弧状凸部(52)の内周面に向けてレーザビームを照射し、レーザ溶接を施す。 In this state, a laser beam is irradiated toward the inner peripheral surface of the arcuate convex portion (52) of the current collector plate (5), and laser welding is performed. この結果、集電板(5)の円弧状凸部(52)と巻き取り電極体(4)の芯体端縁(48)とが、大きな接触面積で互いに接合されると共に、切り起し片(53)と芯体端縁(48)の間の圧着状態が維持されることになる。 As a result, the arcuate convex portion (52) of the current collector plate (5) and the core body edge (48) of the take-up electrode body (4) are joined to each other with a large contact area, and the cut-up piece The crimping state between (53) and the core end edge (48) is maintained.
【0029】 [0029]
図3及び図4に示す如く、蓋体(12)に開設された注液孔(6)は、外側から内側に向けて大、中、小の内径を有する第1〜第3の孔部(6a)(6b)(6c)から構成される段付き孔であって、第1孔部(6a)と第2孔部(6b)の間に、注液孔(6)の外側を向いた第1座面(61)が水平に形成されると共に、第2孔部(6b)と第3孔部(6c)の間に、注液孔(6)の外側を向いた第2座面(62)が水平に形成されている。 As shown in FIGS. 3 and 4, the liquid injection holes (6) formed in the lid (12) have large, medium, and small inner diameters from the outside to the inside (1st to 3rd holes). A stepped hole composed of 6a), (6b), and (6c), which faces the outside of the liquid injection hole (6) between the first hole (6a) and the second hole (6b). The first seat surface (61) is formed horizontally, and the second seat surface (62) facing the outside of the liquid injection hole (6) between the second hole portion (6b) and the third hole portion (6c). ) Is formed horizontally.
第2座面(62)には、注液孔(6)の全周を包囲して円周上を伸びる断面半円状の凸条部(63)が、蓋体(12)の削り出しによって一体に形成されている。 On the second seat surface (62), a ridge portion (63) having a semicircular cross section that surrounds the entire circumference of the liquid injection hole (6) and extends on the circumference is formed by carving out the lid body (12). It is formed integrally.
【0030】 [0030]
弾性部材(2)は、エチレンプロピレンゴム、フッ素樹脂、シリコンゴム、又はブチルゴムを材料として、注液孔(6)の第2孔部(6b)に嵌合可能な外径と、第2孔部(6b)の深さよりも大きな厚さを有する円板状に形成されている。 The elastic member (2) is made of ethylene propylene rubber, fluororesin, silicone rubber, or butyl rubber, and has an outer diameter that can be fitted into the second hole (6b) of the liquid injection hole (6) and the second hole. It is formed in a disk shape having a thickness larger than the depth of (6b). 又、金属板(3)は、アルミニウム製であって、注液孔(6)の第1孔部(6a)に嵌合可能な外径と、第1孔部(6a)の深さと同じ大きさの厚さとを有する円板状に形成されている。 Further, the metal plate (3) is made of aluminum and has an outer diameter that can be fitted into the first hole (6a) of the liquid injection hole (6) and the same size as the depth of the first hole (6a). It is formed in the shape of a disk with a thickness of aluminum.
【0031】 0031
注液孔(6)の第2孔部(6b)に弾性部材(2)を設置し、第1孔部(6a)に金属板(3)を設置して、図5の如く金属板(3)によって弾性部材(2)を強く押圧した状態で、金属板(3)の外周縁に溶接(10)を施し、金属板(3)を蓋体(12)に固定する。 An elastic member (2) is installed in the second hole (6b) of the liquid injection hole (6), a metal plate (3) is installed in the first hole (6a), and the metal plate (3) is as shown in FIG. ) Strongly presses the elastic member (2), welds (10) to the outer peripheral edge of the metal plate (3), and fixes the metal plate (3) to the lid (12).
【0032】 [0032]
上述の如く金属板(3)によって弾性部材(2)を押圧することにより、図6に示す如く、第2座面(62)上の凸条部(63)が弾性部材(2)の裏面に食い込んで、該凸条部(63)の表面と弾性部材(2)の裏面とが互いに強く圧着し、両者間に高いシール性が得られる。 By pressing the elastic member (2) with the metal plate (3) as described above, as shown in FIG. 6, the convex portion (63) on the second seat surface (62) becomes the back surface of the elastic member (2). By biting into it, the front surface of the convex portion (63) and the back surface of the elastic member (2) are strongly pressure-bonded to each other, and a high sealing property can be obtained between them. この結果、第2座面(62)の他の領域における仕上げ精度が多少低く、該領域と弾性部材(2)の間の密着性が低くとも、凸条部(63)による高いシール性により、第2座面(62)と弾性部材(2)の間には、全体として高いシール性が長期間に亘って確保されることになる。 As a result, the finishing accuracy in the other region of the second bearing surface (62) is slightly low, and even if the adhesion between the region and the elastic member (2) is low, the high sealing property by the ridge portion (63) provides. A high sealing property as a whole is ensured between the second bearing surface (62) and the elastic member (2) for a long period of time.
【0033】 0033
従って、図5の如く、金属板(3)を蓋体(12)に溶接する場合、シール性は、金属板(3)よりも内側の弾性部材(2)によって確保されているので、溶接時の熱によって蒸発した有機溶媒が溶接部(10)に付着する虞はなく、よって溶接不良を引き起こす虞はない。 Therefore, as shown in FIG. 5, when the metal plate (3) is welded to the lid (12), the sealing property is ensured by the elastic member (2) inside the metal plate (3), and therefore during welding. There is no possibility that the organic solvent evaporated by the heat of the above will adhere to the welded portion (10), and therefore there is no possibility of causing welding defects. 又、溶接部(10)にクラックやピンホールが存在したとしても、電池缶の気密性に問題はない。 Further, even if there are cracks or pinholes in the welded portion (10), there is no problem in the airtightness of the battery can.
【0034】 0034
第2実施例 Second Example
本実施例の円筒型リチウムイオン二次電池は、図7に示す如く、蓋体(12)に開設された注液孔(60)を塞ぐ構造において第1実施例と異なるが、他の構造は第1実施例と同じであるので、注液孔(60)を塞ぐ構造についてのみ説明し、他の構造については同じ符号を付して説明を省略する。 As shown in FIG. 7, the cylindrical lithium ion secondary battery of this embodiment is different from the first embodiment in the structure of closing the liquid injection hole (60) formed in the lid (12), but the other structures are different. Since it is the same as that of the first embodiment, only the structure for closing the liquid injection hole (60) will be described, and the other structures will be designated by the same reference numerals and the description thereof will be omitted.
【0035】 0035.
電池缶(1)の蓋体(12)に開設された注液孔(60)は、弾性部材(21)と金属板(3)によって塞がれている。 The liquid injection hole (60) formed in the lid (12) of the battery can (1) is closed by an elastic member (21) and a metal plate (3).
図8及び図9に示す如く、蓋体(12)に開設された注液孔(60)は、外側から内側に向けて大、小の内径を有する第1孔部(60a)及び第2孔部(60b)から構成される段付き孔であって、第1孔部(60a)と第2孔部(60b)の間には、注液孔(60)の外側へ向いた座面(64)が形成されている。 As shown in FIGS. 8 and 9, the liquid injection holes (60) formed in the lid (12) have large and small inner diameters from the outside to the inside, and the first hole (60a) and the second hole. It is a stepped hole composed of a portion (60b), and a seat surface (64) facing the outside of the liquid injection hole (60) is provided between the first hole portion (60a) and the second hole portion (60b). ) Is formed.
又、第2孔部(60b)の内周面には、上下2段の位置に、注液孔(60)を包囲して全周を伸びる断面半円状の凸条部(65)(65)が、蓋体(12)の削り出しによって一体に形成されている。 Further, on the inner peripheral surface of the second hole portion (60b), the convex portions (65) (65) having a semicircular cross section that surrounds the liquid injection hole (60) and extends the entire circumference at the upper and lower two-stage positions. ) Is integrally formed by carving out the lid (12).
【0036】 0036
弾性部材(21)は、エチレンプロピレンゴム、フッ素樹脂、シリコンゴム、又はブチルゴムを材料として、注液孔(60)の第2孔部(60b)の内径よりも大きな外径と、第2孔部(60b)の深さと同等の厚さを有する円板状に形成されている。 The elastic member (21) is made of ethylene propylene rubber, fluororesin, silicone rubber, or butyl rubber, and has an outer diameter larger than the inner diameter of the second hole (60b) of the liquid injection hole (60) and a second hole. It is formed in a disk shape having a thickness equivalent to the depth of (60b). 又、金属板(3)は、アルミニウム製であって、注液孔(60)の第1孔部(60a)に嵌合可能な外径と、第1孔部(60a)の深さと同じ大きさの厚さとを有する円板状に形成されている。 Further, the metal plate (3) is made of aluminum and has an outer diameter that can be fitted into the first hole portion (60a) of the liquid injection hole (60) and the same size as the depth of the first hole portion (60a). It is formed in the shape of a disk with a thickness of aluminum.
【0037】 0037
注液孔(60)の第2孔部(60b)に弾性部材(21)を圧入した後、第1孔部(60a)に金属板(3)を設置した状態で、図10の如く金属板(3)の外周縁に溶接(10)を施し、金属板(3)を蓋体(12)に固定する。 After the elastic member (21) is press-fitted into the second hole (60b) of the liquid injection hole (60), the metal plate (3) is installed in the first hole (60a), and the metal plate is as shown in FIG. Welding (10) is performed on the outer peripheral edge of (3), and the metal plate (3) is fixed to the lid (12).
【0038】 [0038]
注液孔(60)の第2孔部(60b)に弾性部材(21)を圧入することにより、図11に示す如く、注液孔(60)の内周面の凸条部(65)(65)が弾性部材(21)の外周面に食い込んで、該凸条部(65)(65)の表面と弾性部材(21)の外周面とが互いに強く圧着し、両者間に高いシール性が得られる。 By press-fitting the elastic member (21) into the second hole portion (60b) of the liquid injection hole (60), as shown in FIG. 11, the convex portion (65) (65) on the inner peripheral surface of the liquid injection hole (60). 65) bites into the outer peripheral surface of the elastic member (21), and the surface of the convex portions (65) (65) and the outer peripheral surface of the elastic member (21) are strongly pressure-bonded to each other, and a high sealing property is provided between the two. can get. この結果、注液孔内周面の他の領域における仕上げ精度が多少低く、該領域と弾性部材(21)の間の密着性が低くとも、凸条部(65)(65)による高いシール性により、注液孔(60)と弾性部材(21)の間には、全体として高いシール性が長期間に亘って確保されることになる。 As a result, the finishing accuracy in the other region of the inner peripheral surface of the injection hole is slightly low, and even if the adhesion between the region and the elastic member (21) is low, the convex portions (65) (65) provide high sealing performance. As a result, a high sealing property as a whole is ensured between the liquid injection hole (60) and the elastic member (21) for a long period of time.
【0039】 [0039]
従って、図10の如く、金属板(3)を蓋体(12)に溶接する場合、シール性は、金属板(3)よりも内側の弾性部材(21)によって確保されているので、溶接時の熱によって蒸発した有機溶媒が溶接部(10)に付着する虞はなく、よって溶接不良を引き起こす虞はない。 Therefore, as shown in FIG. 10, when the metal plate (3) is welded to the lid (12), the sealing property is ensured by the elastic member (21) inside the metal plate (3), so that during welding. There is no possibility that the organic solvent evaporated by the heat of the above will adhere to the welded portion (10), and therefore there is no possibility of causing welding defects. 又、溶接部(10)にクラックやピンホールが存在したとしても、電池缶の気密性に問題はない。 Further, even if there are cracks or pinholes in the welded portion (10), there is no problem in the airtightness of the battery can.
【0040】 0040
第3実施例 Third Example
本実施例においては、図12及び図13に示す如く、蓋体(12)に開設された注液孔(60)は、弾性部材(22)、金属板(31)及び軸体(7)によって塞がれる。 In this embodiment, as shown in FIGS. 12 and 13, the liquid injection hole (60) provided in the lid body (12) is formed by the elastic member (22), the metal plate (31), and the shaft body (7). It is blocked.
注液孔(60)は、第1孔部(60a)及び第2孔部(60b)から構成される段付き孔であって、第2孔部(60b)の内周面には、上下2段の位置に、注液孔(60)を包囲して全周を伸びる断面半円状の凸条部(65)(65)が形成されている。 The liquid injection hole (60) is a stepped hole composed of a first hole portion (60a) and a second hole portion (60b), and the inner peripheral surface of the second hole portion (60b) has two upper and lower holes. At the position of the step, ridges (65) (65) having a semicircular cross section are formed so as to surround the liquid injection hole (60) and extend all around.
【0041】 [0041]
軸体(7)は、先端部が尖った円柱状を呈している。 The shaft body (7) has a columnar shape with a sharp tip.
弾性部材(22)は、注液孔(60)の第2孔部(60b)の内径と同一若しくは僅かに小さな外径と、第2孔部(60b)の深さと同等の厚さを有する円板状に形成されており、その中央部には、軸体(7)の外径よりも小さな内径の穴(23)が凹設されている。 The elastic member (22) is a circle having an outer diameter equal to or slightly smaller than the inner diameter of the second hole portion (60b) of the liquid injection hole (60) and a thickness equivalent to the depth of the second hole portion (60b). It is formed in a plate shape, and a hole (23) having an inner diameter smaller than the outer diameter of the shaft body (7) is recessed in the central portion thereof. 又、金属板(31)は、注液孔(60)の第1孔部(60a)に嵌合可能な外径と、第1孔部(60a)の深さと同じ大きさの厚さとを有する円板状に形成され、その中央部には、軸体(7)が貫通可能な貫通孔(32)が開設されている。 Further, the metal plate (31) has an outer diameter that can be fitted into the first hole portion (60a) of the liquid injection hole (60) and a thickness that is the same as the depth of the first hole portion (60a). It is formed in a disk shape, and a through hole (32) through which the shaft body (7) can penetrate is provided in the central portion thereof.
【0042】 [0042]
注液孔(60)の第2孔部(60b)に弾性部材(22)を嵌入せしめ、第1孔部(60a)に金属板(31)を設置した状態で、図14の如く、金属板(31)の貫通孔(32)と弾性部材(22)の穴(23)に対して、軸体(7)を挿入した後、金属板(31)の外周縁に溶接(10)を施し、金属板(31)を蓋体(12)に固定する。 As shown in FIG. 14, in a state where the elastic member (22) is fitted into the second hole portion (60b) of the liquid injection hole (60) and the metal plate (31) is installed in the first hole portion (60a), as shown in FIG. After inserting the shaft body (7) into the through hole (32) of (31) and the hole (23) of the elastic member (22), welding (10) is performed on the outer peripheral edge of the metal plate (31). The metal plate (31) is fixed to the lid (12).
【0043】 [0043]
弾性部材(22)の穴(23)に軸体(7)を挿入することにより、弾性部材(22)は膨張し、その外周面が注液孔(60)の内周面に押圧される。 By inserting the shaft body (7) into the hole (23) of the elastic member (22), the elastic member (22) expands and its outer peripheral surface is pressed against the inner peripheral surface of the liquid injection hole (60). これによって、注液孔(60)の内周面の凸条部(65)(65)が弾性部材(22)の外周面に食い込んで、該凸条部(65)(65)の表面と弾性部材(22)の外周面とが互いに強く圧着し、両者間に高いシール性が得られる。 As a result, the convex portions (65) (65) on the inner peripheral surface of the liquid injection hole (60) bite into the outer peripheral surface of the elastic member (22) and are elastic with the surface of the convex portions (65) (65). The outer peripheral surfaces of the member (22) are strongly pressure-bonded to each other, and a high sealing property can be obtained between them. この結果、注液孔内周面の他の領域における仕上げ精度が多少低く、該領域と弾性部材(22)の間の密着性が低くとも、凸条部(65)(65)による高いシール性により、注液孔(60)と弾性部材(22)の間には、全体として高いシール性が長期間に亘って確保されることになる。 As a result, the finishing accuracy in the other region of the inner peripheral surface of the injection hole is slightly low, and even if the adhesion between the region and the elastic member (22) is low, the convex portions (65) (65) provide high sealing performance. As a result, a high sealing property as a whole is ensured between the liquid injection hole (60) and the elastic member (22) for a long period of time.
【0044】 [0044]
第4実施例 Fourth Example
本実施例においても、図15及び図16に示す如く、蓋体(12)に開設された注液孔(60)は、弾性部材(22)、金属板(3)及び軸体(71)によって塞がれるが、軸体(71)は、弾性部材(22)の穴(23)の深さと同じ長さに形成されている。 Also in this embodiment, as shown in FIGS. 15 and 16, the liquid injection hole (60) formed in the lid (12) is formed by the elastic member (22), the metal plate (3), and the shaft (71). Although it is closed, the shaft body (71) is formed to have the same length as the depth of the hole (23) of the elastic member (22). 又、金属板(3)には、貫通孔は開設されていない。 Further, the metal plate (3) is not provided with a through hole.
【0045】 0045
注液孔(60)の第2孔部(60b)に弾性部材(22)を嵌入せしめ、図16の如く弾性部材(22)の穴(23)に軸体(71)を圧入した後、第1孔部(60a)に金属板(3)を設置して、該金属板(3)の外周縁に溶接(10)を施し、金属板(3)を蓋体(12)に固定する。 The elastic member (22) is fitted into the second hole portion (60b) of the liquid injection hole (60), and the shaft body (71) is press-fitted into the hole (23) of the elastic member (22) as shown in FIG. A metal plate (3) is installed in one hole (60a), welding (10) is performed on the outer peripheral edge of the metal plate (3), and the metal plate (3) is fixed to the lid (12).
【0046】 [0046]
弾性部材(22)の穴(23)に軸体(71)を圧入することにより、弾性部材(22)は膨張し、その外周面が注液孔(60)の内周面に押圧される。 By press-fitting the shaft body (71) into the hole (23) of the elastic member (22), the elastic member (22) expands and its outer peripheral surface is pressed against the inner peripheral surface of the liquid injection hole (60). これによって、注液孔(60)の内周面の凸条部(65)(65)が弾性部材(22)の外周面に食い込んで、該凸条部(65)(65)の表面と弾性部材(22)の外周面とが互いに強く圧着し、両者間に高いシール性が得られる。 As a result, the convex portions (65) (65) on the inner peripheral surface of the liquid injection hole (60) bite into the outer peripheral surface of the elastic member (22) and are elastic with the surface of the convex portions (65) (65). The outer peripheral surfaces of the member (22) are strongly pressure-bonded to each other, and a high sealing property can be obtained between them.
【0047】 [0047]
第5実施例 Fifth Example
本実施例においては、図17及び図18に示す如く、蓋体(12)に開設された注液孔(60)は、弾性部材(22)、金属板(33)及び軸体(72)によって塞がれる。 In this embodiment, as shown in FIGS. 17 and 18, the liquid injection hole (60) formed in the lid body (12) is formed by the elastic member (22), the metal plate (33), and the shaft body (72). It is blocked.
注液孔(60)は、第1孔部(60a)及び第2孔部(60b)から構成され、第2孔部(60b)の内周面には、注液孔(60)を包囲して全周を伸びる断面半円状の凸条部(65)(65)が形成されている。 The liquid injection hole (60) is composed of a first hole portion (60a) and a second hole portion (60b), and the liquid injection hole (60) is surrounded on the inner peripheral surface of the second hole portion (60b). The ridges (65) and (65) having a semicircular cross section extending all around are formed.
【0048】 0048
軸体(72)は、先端部が尖った円柱状を呈し、頭部には外ねじ(73)が形成されている。 The shaft body (72) has a columnar shape with a sharp tip, and an external screw (73) is formed on the head.
弾性部材(22)は、注液孔(60)の第2孔部(60b)の内径と同一若しくは僅かに小さな外径と、第2孔部(60b)の深さと同等の厚さを有する円板状に形成されており、その中央部には、軸体(72)の外径よりも小さな内径の穴(23)が凹設されている。 The elastic member (22) is a circle having an outer diameter equal to or slightly smaller than the inner diameter of the second hole portion (60b) of the liquid injection hole (60) and a thickness equivalent to the depth of the second hole portion (60b). It is formed in a plate shape, and a hole (23) having an inner diameter smaller than the outer diameter of the shaft body (72) is recessed in the central portion thereof. 又、金属板(33)は、注液孔(60)の第1孔部(60a)に嵌合可能な外径と、第1孔部(60a)の深さと同じ大きさの厚さとを有する円板状に形成され、その中央部には、軸体(72)の外ねじ(73)が螺合すべき内ねじ(34)が開設されている。 Further, the metal plate (33) has an outer diameter that can be fitted into the first hole portion (60a) of the liquid injection hole (60) and a thickness that is the same as the depth of the first hole portion (60a). It is formed in a disk shape, and an internal screw (34) to which the external screw (73) of the shaft body (72) should be screwed is provided in the central portion thereof.
【0049】 [0049]
注液孔(60)の第2孔部(60b)に弾性部材(22)を嵌入せしめた後、第1孔部(60a)に金属板(33)を設置した後、図18の如く、金属板(33)の内ねじ(34)に軸体(72)の外ねじ(73)をねじ込みながら、弾性部材(22)の穴(23)に軸体(72)の先端部を圧入する。 After the elastic member (22) is fitted into the second hole (60b) of the liquid injection hole (60), the metal plate (33) is installed in the first hole (60a), and then the metal is as shown in FIG. While screwing the external screw (73) of the shaft body (72) into the internal screw (34) of the plate (33), the tip portion of the shaft body (72) is press-fitted into the hole (23) of the elastic member (22). 最後に、金属板(33)の外周縁に溶接(10)を施し、金属板(33)を蓋体(12)に固定する。 Finally, welding (10) is performed on the outer peripheral edge of the metal plate (33) to fix the metal plate (33) to the lid (12).
【0050】 0050
弾性部材(22)の穴(23)に軸体(72)の先端部を圧入することにより、弾性部材(22)は膨張し、その外周面が注液孔(60)の内周面に押圧される。 By press-fitting the tip of the shaft body (72) into the hole (23) of the elastic member (22), the elastic member (22) expands and its outer peripheral surface presses against the inner peripheral surface of the liquid injection hole (60). Will be done. これによって、注液孔(60)の内周面の凸条部(65)(65)が弾性部材(22)の外周面に食い込んで、該凸条部(65)(65)の表面と弾性部材(22)の外周面とが互いに強く圧着し、両者間に高いシール性が得られる。 As a result, the convex portions (65) (65) on the inner peripheral surface of the liquid injection hole (60) bite into the outer peripheral surface of the elastic member (22) and are elastic with the surface of the convex portions (65) (65). The outer peripheral surfaces of the member (22) are strongly pressure-bonded to each other, and a high sealing property can be obtained between them.
【0051】 0051
上述の如く、本発明に係る円筒型リチウムイオン二次電池によれば、蓋体(12)の注液孔を弾性部材によって高いシール性で塞ぐことが出来るので、電池缶(1)の気密性を長期間に亘って維持することが出来る。 As described above, according to the cylindrical lithium ion secondary battery according to the present invention, the liquid injection hole of the lid (12) can be closed with an elastic member with high sealing property, so that the airtightness of the battery can (1) is high. Can be maintained for a long period of time.
【0052】 [0052]
尚、本発明の各部構成は上記実施の形態に限らず、特許請求の範囲に記載の技術的範囲内で種々の変形が可能である。 The configuration of each part of the present invention is not limited to the above embodiment, and various modifications can be made within the technical scope described in the claims. 例えば、金属板(3)(31)を蓋体(12)に溶接する場合、必ずしも金属板全周に連続的に溶接を施す必要はなく、間欠的な溶接であってもよい。 For example, when the metal plates (3) and (31) are welded to the lid (12), it is not always necessary to continuously weld the entire circumference of the metal plate, and intermittent welding may be used. 又、溶接による固定に限らず、金属板の外周面には内ねじ、蓋体の注液孔の内周面には内ねじを形成して、ねじ込みによって金属板を蓋体に固定することも可能である。 In addition to fixing by welding, it is also possible to form an internal screw on the outer peripheral surface of the metal plate and an internal screw on the inner peripheral surface of the liquid injection hole of the lid, and fix the metal plate to the lid by screwing. It is possible.
【図面の簡単な説明】 [Simple explanation of drawings]
【図1】第1実施例の円筒型リチウムイオン二次電池の断面図である。 FIG. 1 is a cross-sectional view of a cylindrical lithium ion secondary battery of the first embodiment.
【図2】巻き取り電極体に対する集電構造を示す斜視図である。 FIG. 2 is a perspective view showing a current collecting structure for a take-up electrode body.
【図3】注液孔を塞ぐ構造を一部破断して示す分解斜視図である。 FIG. 3 is an exploded perspective view showing a partially broken structure that closes a liquid injection hole.
【図4】同上構造を分解して示す断面図である。 FIG. 4 is a cross-sectional view showing the same structure in an exploded manner.
【図5】同上構造の組立状態の断面図である。 FIG. 5 is a cross-sectional view of the same structure in an assembled state.
【図6】同上構造の要部を拡大して示す断面図である。 FIG. 6 is an enlarged cross-sectional view showing a main part of the same structure.
【図7】第2実施例の円筒型リチウムイオン二次電池の断面図である。 FIG. 7 is a cross-sectional view of the cylindrical lithium ion secondary battery of the second embodiment.
【図8】注液孔を塞ぐ構造を一部破断して示す分解斜視図である。 FIG. 8 is an exploded perspective view showing a partially broken structure that closes a liquid injection hole.
【図9】同上構造を分解して示す断面図である。 FIG. 9 is a cross-sectional view showing the same structure in an exploded manner.
【図10】同上構造の組立状態の断面図である。 FIG. 10 is a cross-sectional view of the same structure in an assembled state.
【図11】同上構造の要部を拡大して示す断面図である。 FIG. 11 is an enlarged cross-sectional view showing a main part of the same structure.
【図12】第3実施例において注液孔を塞ぐ構造を一部破断して示す分解斜視図である。 FIG. 12 is an exploded perspective view showing a structure that closes a liquid injection hole in a third embodiment with a partial breakage.
【図13】同上構造を分解して示す断面図である。 FIG. 13 is a cross-sectional view showing the same structure in an exploded manner.
【図14】同上構造の組立状態の断面図である。 FIG. 14 is a cross-sectional view of the same structure in an assembled state.
【図15】第4実施例において注液孔を塞ぐ構造を分解して示す断面図である。 FIG. 15 is a cross-sectional view showing an exploded structure for closing a liquid injection hole in a fourth embodiment.
【図16】同上構造の組立状態の断面図である。 FIG. 16 is a cross-sectional view of the same structure in an assembled state.
【図17】第5実施例において注液孔を塞ぐ構造を分解して示す断面図である。 FIG. 17 is a cross-sectional view showing an exploded structure for closing a liquid injection hole in a fifth embodiment.
【図18】同上構造の組立状態の断面図である。 FIG. 18 is a cross-sectional view of the same structure in an assembled state.
【図19】従来の円筒型リチウムイオン二次電池の断面図である。 FIG. 19 is a cross-sectional view of a conventional cylindrical lithium ion secondary battery.
【符号の説明】 [Explanation of symbols]
(1) 電池缶(10) 溶接部(11) 筒体(12) 蓋体(2) 弾性部材(21) 弾性部材(22) 弾性部材(23) 穴(3) 金属板(31) 金属板(32) 貫通孔(33) 金属板(34) 内ねじ(4) 巻き取り電極体(5) 集電板(6) 注液孔(61) 第1座面(62) 第2座面(63) 凸条部(64) 座面(65) 凸条部(7) 軸体(71) 軸体(72) 軸体(73) 外ねじ(9) 電極端子機構[0001] (1) Battery can (10) Welded part (11) Cylindrical body (12) Lid body (2) Elastic member (21) Elastic member (22) Elastic member (23) Hole (3) Metal plate (31) Metal plate ( 32) Through hole (33) Metal plate (34) Internal screw (4) Take-up electrode body (5) Current collector plate (6) Liquid injection hole (61) First seat surface (62) Second seat surface (63) Convex part (64) Seat surface (65) Convex part (7) Shaft body (71) Shaft body (72) Shaft body (73) External screw (9) Electrode terminal mechanism [0001]
TECHNICAL FIELD OF THE INVENTION TECHNICAL FIELD OF THE Invention
The present invention relates to a secondary battery in which an electrode body serving as a secondary battery element is housed inside a battery can and power generated by the electrode body can be taken out from a pair of electrode terminals provided on the battery can. is there. The present invention relates to a secondary battery in which an electrode body serving as a secondary battery element is housed inside a battery can and power generated by the electrode body can be taken out from a pair of electrode terminals provided on the battery can. Is there ..
[0002] [0002]
[Prior art] [Prior art]
2. Description of the Related Art In recent years, lithium secondary batteries with a high energy density have attracted attention as power supplies for portable electronic devices. In addition, large-capacity cylindrical secondary batteries have attracted attention as power sources for electric vehicles. 2. Description of the Related Art In recent years, lithium secondary batteries with a high energy density have attracted attention as power supplies for portable electronic devices. In addition, large-capacity cylindrical secondary batteries have attracted attention as power sources for electric vehicles.
As shown in FIG. 19, a conventional cylindrical lithium ion secondary battery forms a battery can (1) by welding and fixing a lid (12) to each opening of a cylindrical body (11). A wound electrode body (4) is installed inside 1), and a power generated by the wound electrode body (4) is supplied to a pair of positive and negative electrodes attached to both lids (12) and (12). The terminal mechanisms (9) and (9) can be taken out to the outside. As shown in FIG. 19, a conventional cylindrical lithium ion secondary battery forms a battery can (1) by welding and fixing a lid (12) to each opening of a cylindrical body (11). A wound electrode body (4) is installed inside 1), and a power generated by the weld electrode body (4) is supplied to a pair of positive and negative electrodes attached to both lids (12) and (12). The terminal mechanisms (9) and (9) can be taken out to the outside.
[0003] [0003]
A gas discharge valve (8) for discharging gas when the pressure in the battery can (1) exceeds a predetermined value is attached to the lid (12). The gas discharge valve (8) has a ring (81) fixed to the outer periphery of a valve membrane (82), and the outer periphery of the ring (81) has a through hole ( 13) is welded to the opening edge. A gas discharge valve (8) for possibly gas when the pressure in the battery can (1) exceeds a predetermined value is attached to the lid (12). The gas discharge valve (8) has a ring (81) fixed to the outer grating of a valve membrane (82), and the outer peripheral of the ring (81) has a through hole (13) is welded to the opening edge.
A liquid injection hole (14) for injecting an electrolytic solution in a battery assembling step is opened in the lid (12), and a metal plug (15) is screwed into the liquid injection hole (14). , Sealed. A liquid injection hole (14) for injecting an electrolyte solution in a battery assembling step is opened in the lid (12), and a metal plug (15) is screwed into the liquid injection hole (14)., Sealed.
[0004] [0004]
The winding electrode body (4) includes a separator impregnated with a non-aqueous electrolyte interposed between a positive electrode containing a lithium composite oxide and a negative electrode containing a carbon material, and spirally winding these. It is configured. Disc-shaped current collectors (5) are welded to both ends of the wound electrode body (4), respectively, and the current collectors (5) are connected to the electrode terminal mechanism (9) via lead members (55). Is connected to the base end. The winding electrode body (4) includes a separator impregnated with a non-aqueous electrolyte involved between a positive electrode containing a lithium composite oxide and a negative electrode containing a carbon material, and spirally winding these. It is configured. Disc-shaped current collectors (5) are welded to both ends of the wound electrode body (4), respectively, and the current collectors (5) are connected to the electrode terminal mechanism (9) via lead members (55). Is connected to the base end.
[0005] [0005]
In the secondary battery as described above, as a structure for closing the liquid injection hole, a rubber stopper is fitted into the liquid injection hole, and a metal sealing body is provided to cover the rubber plug, and the metal sealing hole is closed. A structure in which the body is welded and fixed to a battery container (Patent Literature 2), a liquid injection hole is covered with a sheet material, and a metal injection plug is installed so as to cover the sheet material. (Patent Document 3) has been proposed. In the secondary battery as described above, as a structure for closing the liquid injection hole, a rubber stopper is fitted into the liquid injection hole, and a metal sealing body is provided to cover the rubber plug, and the metal sealing hole is closed. A structure in which the body is welded and fixed to a battery container (Patent Literature 2), a liquid injection hole is covered with a sheet material, and a metal injection plug is installed so as to cover the sheet material. (Patent Document 3) ) Has been proposed.
[0006] [0006]
[Patent Document 1] [Patent Document 1]
Japanese Patent Application Laid-Open No. 2000-149902 [Patent Document 2] Japanese Patent Application Laid-Open No. 2000-149902 [Patent Document 2]
Japanese Patent Application Laid-Open No. 2001-313022 [Patent Document 3] Japanese Patent Application Laid-Open No. 2001-313022 [Patent Document 3]
JP 2000-215883 A JP 2000-215883 A
[Problems to be solved by the invention] [Problems to be solved by the invention]
However, in the sealing structure in which the metal stopper (15) is screwed into the liquid injection hole (14) of the lid (12) as shown in FIG. 19, it is possible to maintain high airtightness between the screw surfaces in long-term use of the battery. It is difficult, and if moisture is mixed into the battery can (1) due to a decrease in airtightness, the performance of the battery will be reduced. However, in the sealing structure in which the metal stopper (15) is screwed into the liquid injection hole (14) of the lid (12) as shown in FIG. 19, it is possible to maintain high airtightness between the screw surfaces in long -term use of the battery. It is difficult, and if moisture is mixed into the battery can (1) due to a decrease in airtightness, the performance of the battery will be reduced.
Therefore, it is conceivable that the metal plug (15) is welded to the lid (12) to secure airtightness by a welded portion. However, heat during welding is transmitted into the battery can and the organic solvent evaporates. Therefore, there is a possibility that the organic solvent adheres to the welded portion to cause poor welding. Therefore, it is conceivable that the metal plug (15) is welded to the lid (12) to secure airtightness by a welded portion. However, heat during welding is transmitted into the battery can and the organic solvent evaporates. Therefore, there is a possibility that the organic solvent adheres to the welded portion to cause poor welding.
[0008] [0008]
Further, in a structure in which a liquid injection hole is closed by a rubber stopper and a metal sealing body main body (Patent Document 2), or a structure in which a liquid injection hole is closed by a sheet material and a liquid injection stopper (Patent Document 3), a rubber stopper or a sheet is used. It is necessary to improve the sealing performance at the time of welding by finishing the inner peripheral surface and the opening edge surface of the injection hole where the material adheres to a flat surface with high accuracy, but especially in large batteries, Since the area to be finished on a plane is widened, it is difficult to obtain high finishing accuracy over the entire area. Therefore, in order to maintain the airtightness of the battery can, a high airtightness is required for the welded portion of the metal sealing body and the injection plug, but pinholes and cracks may be present in the welded portion. Therefore, it is difficult to maintain airtightness. Further, in a structure in which a liquid injection hole is closed by a rubber stopper and a metal sealing body main body (Patent Document 2), or a structure in which a liquid injection hole is closed by a sheet material and a liquid injection stopper (Patent Document 3), a rubber stopper or a sheet is used. It is necessary to improve the sealing performance at the time of welding by finishing the inner peripheral surface and the opening edge surface of the injection hole where the material adheres to a flat surface with high accuracy, but especially in large batteries, Since the area to be finished on a plane is widened, it is difficult to obtain high finishing accuracy over the entire area. Therefore, in order to maintain the airtightness of the battery can, a high airtightness is required for the welded portion of the metal sealing body and the injection plug, but pinholes and cracks may be present in the welded portion. Therefore, it is difficult to maintain airtightness.
[0009] [0009]
Therefore, an object of the present invention is to provide a secondary battery that can maintain high airtightness over a long period of time in a structure that closes a liquid injection hole of a battery can. Therefore, an object of the present invention is to provide a secondary battery that can maintain high airtightness over a long period of time in a structure that closes a liquid injection hole of a battery can.
[0010] [0010]
[Means for solving the problem] [Means for solving the problem]
The secondary battery according to the present invention is configured such that an electrode body impregnated with an electrolyte is accommodated in a metal battery can. The secondary battery according to the present invention is configured such that an electrode body impregnated with an electrolyte is accommodated in a metal battery can.
The battery can is provided with a pouring hole for injecting an electrolytic solution in an assembling process, the pouring hole is a stepped hole, and the step portion has a seating surface facing the outside of the battery can. A convex ridge is formed on the seat surface so as to surround the liquid injection hole and extend all around, and an elastic member is installed on the seat surface, and a metal plate is installed outside the elastic member. The metal plate is fixed to the battery can with the elastic member pressed against the seat surface. The battery can is provided with a pouring hole for injecting an electrolyte solution in an assembling process, the pouring hole is a stepped hole, and the step portion has a seating surface facing the outside of the battery can. A convex ridge is formed on the seat surface so as to surround the liquid injection hole and extend all around, and an elastic member is installed on the seat surface, and a metal plate is installed outside the elastic member. The metal plate is fixed to the battery can with the elastic member pressed against the seat surface.
[0011] [0011]
Specifically, the ridges are formed by shaving in the manufacturing process of the battery can. The metal plate is fixed to the battery can by welding or screwing. Specifically, the ridges are formed by shaving in the manufacturing process of the battery can. The metal plate is fixed to the battery can by welding or screwing.
[0012] [0012]
In the secondary battery of the present invention, when the elastic member is pressed against the seat surface, the ridge formed on the seat digs into the elastic member, and the surface of the ridge and the surface of the elastic member are Are strongly pressed together, and a high sealing property is obtained between them. Therefore, even if the finishing accuracy in the other area of the seating surface is somewhat low and the adhesion between the area and the elastic member is low, the overall sealing between the seating surface and the elastic member due to the high sealing property in the ridge portion. As a result, a high sealing property is ensured for a long period of time. In the secondary battery of the present invention, when the elastic member is pressed against the seat surface, the ridge formed on the seat digs into the elastic member, and the surface of the ridge and the surface of the elastic member are Are strongly pressed together , and a high sealing property is obtained between them. Therefore, even if the finishing accuracy in the other area of ​​the seating surface is somewhat low and the adhesion between the area and the elastic member is low, the overall sealing between the seating surface and The elastic member due to the high sealing property in the ridge portion. As a result, a high sealing property is ensured for a long period of time.
[0013] [0013]
Therefore, when the metal plate is fixed to the battery can by welding, the sealing property is ensured between the elastic member and the seat surface inside the metal plate, so that the organic solvent evaporated by heat during welding is welded. There is no danger of sticking to the parts, and therefore no danger of causing poor welding. Even if cracks or pinholes are present in the welded portion, there is no problem in the airtightness of the battery can. Therefore, when the metal plate is fixed to the battery can by welding, the sealing property is ensured between the elastic member and the seat surface inside the metal plate, so that the organic solvent easily by heat during welding is welded. There is no danger. Of sticking to the parts, and therefore no danger of causing poor welding. Even if cracks or pinholes are present in the welded portion, there is no problem in the airtightness of the battery can.
[0014] [0014]
In another secondary battery according to the present invention, the battery can is provided with a liquid injection hole for injecting an electrolytic solution in an assembling process, and an inner peripheral surface of the liquid injection hole has a liquid injection hole. Is formed, and one or a plurality of protruding ridges extending over the entire circumference are formed, an elastic member is press-fitted into the liquid injection hole, and an outer peripheral surface of the elastic member is pressed against an inner peripheral surface of the liquid injection hole. I have. In another secondary battery according to the present invention, the battery can is provided with a liquid injection hole for injecting an electrolyte solution in an assembling process, and an inner peripheral surface of the liquid injection hole has a liquid injection hole. Is formed, and one or a plurality of forming ridges extending over the entire circumference are formed, an elastic member is press-fitted into the liquid injection hole, and an outer peripheral surface of the elastic member is pressed against an inner peripheral surface of the liquid injection hole. I have.
[0015] [0015]
In a specific configuration, the protruding ridges are formed by cutting in a manufacturing process of the battery can. In addition, a metal plate is provided outside the elastic member, and the metal plate is fixed to the battery can by welding or screwing. In a specific configuration, the forming ridges are formed by cutting in a manufacturing process of the battery can. In addition, a metal plate is provided outside the elastic member, and the metal plate is fixed to the battery can by welding or screwing.
[0016] [0016]
In the above secondary battery of the present invention, when the elastic member is press-fitted into the liquid injection hole, the ridge formed on the inner peripheral surface of the liquid injection hole bites into the elastic member, and the ridge is formed. The surface and the surface of the elastic member are strongly pressed against each other, and a high sealing property is obtained between the two. Therefore, the finishing accuracy in the other region of the liquid injection hole inner peripheral surface is somewhat low, and even if the adhesion between the region and the elastic member is low, the high sealing property in the ridge portion allows the liquid injection hole inner peripheral surface to be in contact with the liquid injection hole inner peripheral surface. As a whole, a high sealing property is maintained between the elastic members for a long time. In the above secondary battery of the present invention, when the elastic member is press-fitted into the liquid injection hole, the ridge formed on the inner peripheral surface of the liquid injection hole bites into the elastic member, and the ridge is formed. surface and the surface of the elastic member are strongly pressed against each other, and a high sealing property is obtained between the two. Therefore, the finishing accuracy in the other region of the liquid injection hole inner peripheral surface is somewhat low, and even if The adhesion between the region and the elastic member is low, the high sealing property in the ridge portion allows the liquid injection hole inner peripheral surface to be in contact with the liquid injection hole inner peripheral surface. As a whole, a high sealing property is maintained between the elastic members for a long time.
[0017] [0017]
Therefore, when the metal plate is fixed to the battery can by welding, the sealing property is ensured between the elastic member inside the metal plate and the inner peripheral surface of the liquid injection hole, so that the metal plate is evaporated by heat during welding. There is no possibility that the organic solvent will adhere to the welded portion, and therefore, there is no possibility of causing poor welding. Even if cracks or pinholes are present in the welded portion, there is no problem in the airtightness of the battery can. Therefore, when the metal plate is fixed to the battery can by welding, the sealing property is ensured between the elastic member inside the metal plate and the inner peripheral surface of the liquid injection hole, so that the metal plate is insulated by heat during welding. There is no possibility that the organic solvent will adhere to the welded portion, and therefore, there is no possibility of causing poor welding. Even if cracks or pinholes are present in the welded portion, there is no problem in the airtightness of the battery. can.
[0018] [0018]
In a more specific configuration, a shaft body is fitted into a hole formed in a central portion of the elastic member, and the outer peripheral surface of the elastic member is pressed against the inner peripheral surface of the liquid injection hole by expanding the elastic member. are doing. According to this specific configuration, the degree of pressure bonding between the inner peripheral surface of the liquid injection hole and the elastic member can be further increased. In a more specific configuration, a shaft body is fitted into a hole formed in a central portion of the elastic member, and the outer peripheral surface of the elastic member is pressed against the inner peripheral surface of the liquid injection hole by expanding the elastic member According to this specific configuration, the degree of pressure bonding between the inner peripheral surface of the liquid injection hole and the elastic member can be further increased.
[0019] [0019]
The elastic member is made of ethylene propylene rubber, fluorine resin, silicon rubber, or butyl rubber. These materials have resistance to an electrolytic solution, and their elasticity does not decrease even after long-term use, so that high sealing properties are maintained over a long period of time. The elastic member is made of ethylene propylene rubber, fluorine resin, silicone rubber, or butyl rubber. These materials have resistance to an modulus solution, and their elasticity does not decrease even after long-term use, so that high sealing properties are maintained over a long period of time.
[0020] [0020]
【The invention's effect】 [The invention's effect]
ADVANTAGE OF THE INVENTION According to the secondary battery which concerns on this invention, the airtightness of a battery can can be maintained over a long period of time by closing a liquid injection hole with high sealing property. ADVANTAGE OF THE ARCserve to the secondary battery which concerns on this invention, the airtightness of a battery can can be maintained over a long period of time by closing a liquid injection hole with high sealing property.
[0021] [0021]
BEST MODE FOR CARRYING OUT THE INVENTION BEST MODE FOR CARRYING OUT THE Invention
Hereinafter, an embodiment in which the present invention is applied to a cylindrical lithium ion secondary battery will be specifically described with reference to the drawings. Recently, an embodiment in which the present invention is applied to a cylindrical lithium ion secondary battery will be specifically described with reference to the drawings.
[0022] [0022]
First Embodiment As shown in FIG. 1, a cylindrical lithium ion secondary battery of this embodiment has an aluminum lid (12) at each opening of an aluminum cylinder (11). An airtight battery can (1) is formed by fixing by laser welding, and a wound electrode body (4) is housed inside the battery can (1). Further, a pair of positive and negative electrode terminal mechanisms (9) and (9) are attached to both lids (12) and (12) of the battery can (1), and the electric power generated by the winding electrode body (4) is supplied. It is possible to take it out. First Embodiment As shown in FIG. 1, a cylindrical lithium ion secondary battery of this embodiment has an aluminum lid (12) at each opening of an aluminum cylinder (11). An airtight battery can (1) is formed by fixing by laser welding , and a wound electrode body (4) is housed inside the battery can (1). Further, a pair of positive and negative electrode terminal mechanisms (9) and (9) are attached to both lids (12) and (12) of the battery can (1), and the electric power generated by the winding electrode body (4) is supplied. It is possible to take it out.
[0023] [0023]
A through-hole (13) is formed in the lid (12) of the battery can (1), and gas is discharged into the through-hole (13) when the pressure in the battery can (1) exceeds a predetermined value. The fixed gas discharge valve (8) is fixed. The gas discharge valve (8) has a ring (81) fixed to the outer periphery of a valve membrane (82), and the outer periphery of the ring (81) has a through hole ( 13) is welded to the opening edge. A through-hole (13) is formed in the lid (12) of the battery can (1), and gas is discharged into the through-hole (13) when the pressure in the battery can (1) exceeds a predetermined value. The fixed gas discharge valve (8) is fixed. The gas discharge valve (8) has a ring (81) fixed to the outer peripheral of a battery membrane (82), and the outer peripheral of the ring (81) has a through hole (13) is welded to the opening edge.
The lid (12) is provided with a liquid injection hole (6) for injecting an electrolytic solution in an assembling process. The liquid injection hole (6) is provided with an elastic member (2) described later and a metal plate (6). Blocked by 3). The lid (12) is provided with a liquid injection hole (6) for injecting an electrolyte solution in an assembling process. The liquid injection hole (6) is provided with an elastic member (2) described later and a metal plate (6) . Blocked by 3).
[0024] [0024]
Current collecting plates (5) are provided at both ends of the winding electrode body (4), and the current collecting plates (5) are joined to the winding electrode body (4) by metal spraying or laser welding. The tip of the lead portion (55) projecting from the end of the current collector plate (5) is spot-welded to the flange (92) of the electrode terminal (91) constituting the electrode terminal mechanism (9). They are joined by sonic welding or laser welding. Current collecting plates (5) are provided at both ends of the winding electrode body (4), and the current collecting plates (5) are joined to the winding electrode body (4) by metal spraying or laser welding. The tip of the lead portion (55) projecting from the end of the current collector plate (5) is spot-welded to the flange (92) of the electrode terminal (91) therefore the electrode terminal mechanism (9). They are joined by sonic welding or laser welding.
[0025] [0025]
The electrode terminal mechanism (9) includes an electrode terminal (91) attached through the lid (12) of the battery can (1), and a flange (92) is provided at a base end of the electrode terminal (91). ) Is formed. An insulating packing (93) is attached to the through-hole of the lid (12), so that electrical insulation and sealing between the lid (12) and the fastening member (91) are maintained. A washer (94) is fitted to the electrode terminal (91) from the outside of the lid (12), and a first nut (95) and a second nut (96) are screwed into the electrode terminal (91). Then, the first nut (95) is tightened, and the insulating packing (93) is sandwiched between the flange (92) of the electrode terminal (91) and the washer (94) to enhance the sealing performance. The electrode terminal mechanism (9) includes an electrode terminal (91) attached through the lid (12) of the battery can (1), and a flange (92) is provided at a base end of the electrode terminal (91).) Is formed. An insulating packing (93) is attached to the through-hole of the lid (12), so that electrical insulation and sealing between the lid (12) and the flange member (91) are maintained. A washer (94) is fitted to the electrode terminal (91) from the outside of the lid (12), and a first nut (95) and a second nut (96) are screwed into the electrode terminal (91). Then, the first nut (95) ) is tightened, and the insulating packing (93) is sandwiched between the flange (92) of the electrode terminal (91) and the washer (94) to enhance the sealing performance.
[0026] [0026]
As shown in FIG. 2, the wound electrode body (4) has a positive electrode (41) formed by applying a positive electrode active material (44) made of a lithium composite oxide to the surface of a core (45) made of aluminum foil. A negative electrode (43) obtained by applying a negative electrode active material (46) containing a carbon material to the surface of a core (47) made of a copper foil; and a separator (42) impregnated with a non-aqueous electrolyte, The positive electrode (41) and the negative electrode (43) are superposed on the separator (42) so as to be shifted in the width direction, and are wound in a spiral shape. As a result, at one end of the two ends of the winding electrode body (4) in the winding axis direction, the end of the core body (45) of the positive electrode (41) is located outward of the edge of the separator (42). At the other end, the edge (48) of the core (47) of the negative electrode (43) protrudes outward from the edge of the separator (42). As shown in FIG. 2, the wound electrode body (4) has a positive electrode (41) formed by applying a positive electrode active material (44) made of a lithium composite oxide to the surface of a core (45) made of aluminum foil. A negative electrode (43) obtained by applying a negative electrode active material (46) containing a carbon material to the surface of a core (47) made of a copper foil; and a separator (42) impregnated with a non-aqueous electrolyte, The positive electrode (41) and the negative electrode (43) are superposed on the separator (42) so as to be directed in the width direction, and are wound in a spiral shape. As a result, at one end of the two ends of the winding electrode body (4) in the winding axis direction, the end of the core body (45) of the positive electrode (41) is located outward of the edge of the separator (42). At the other end, the edge (48) of the core (47) of the negative electrode (43) protrudes outward from the edge of the separator (42).
[0027] [0027]
The current collector plate (5) has a disc-shaped main body (51), and the disc-shaped main body (51) has a central hole (54). The disk-shaped main body (51) is integrally formed with a plurality of arc-shaped convex portions (52) extending radially around the center hole (54) and protruding toward the winding electrode body (4). Further, a plurality of cut-and-raised pieces (53) are formed on the disk-shaped main body (51) between the adjacent arc-shaped convex portions (52) and (52), respectively, and the wound electrode body (4) is formed. Protruding to the side. Further, a strip-shaped lead portion (55) is integrally formed at an end of the disc-shaped main body (51). The current collector plate (5) has a disc-shaped main body (51), and the disc-shaped main body (51) has a central hole (54). The disk-shaped main body (51) is formed with a Multiple of arc-shaped convex portions (52) extending extending around the center hole (54) and extending toward the winding electrode body (4). Further, a plurality of cut-and-raised pieces (53) are formed on the disk- shaped main body (51) between the adjacent arc-shaped convex portions (52) and (52), respectively, and the wound electrode body (4) is formed. Protruding to the side. Further, a strip-shaped lead portion (55) ) is formed at an end of the disc-shaped main body (51).
The arc-shaped convex portion (52) of the current collector plate (5) has a semicircular arc whose cross section orthogonal to the radius line of the disc-shaped main body (51). The arc-shaped convex portion (52) of the current collector plate (5) has a semicircular arc whose cross section orthogonal to the radius line of the disc-shaped main body (51).
[0028] [0028]
After producing the current collector plate (5), the current collector plate (5) is pressed against the core edge (48) formed at each end of the wound electrode body (4). As a result, the arc-shaped projection (52) of the current collector plate (5) bites into the core edge (48) of the winding electrode body (4), and the arc-shaped projection (52) and the core edge (52). Between 48), a joining surface composed of a cylindrical surface is formed. The cut-and-raised pieces (53) of the current collector plate (5) bite into the core edge (48) of the winding electrode body (4) and are pressed against the core edge (48). . After producing the current collector plate (5), the current collector plate (5) is pressed against the core edge (48) formed at each end of the wound electrode body (4). As a result, the arc-shaped projection (52) ) of the current collector plate (5) bites into the core edge (48) of the winding electrode body (4), and the arc-shaped projection (52) and the core edge (52). Between 48), a joining surface composed of a cylindrical surface is formed. The cut-and-raised pieces (53) of the current collector plate (5) bite into the core edge (48) of the winding electrode body (4) and are pressed against the core edge ( 48) ..
In this state, the inner peripheral surface of the arc-shaped convex portion (52) of the current collector plate (5) is irradiated with a laser beam to perform laser welding. As a result, the arc-shaped convex portion (52) of the current collector plate (5) and the core edge (48) of the winding electrode body (4) are joined to each other with a large contact area, and the cut and raised pieces are formed. The crimped state between (53) and the core edge (48) is maintained. In this state, the inner peripheral surface of the arc-shaped convex portion (52) of the current collector plate (5) is conventionally with a laser beam to perform laser welding. As a result, the arc-shaped convex portion (52) of the current collector plate (5) and the core edge (48) of the winding electrode body (4) are joined to each other with a large contact area, and the cut and raised pieces are formed. The crimped state between (53) and the core edge (48) is maintained.
[0029] [0029]
As shown in FIGS. 3 and 4, the liquid injection holes (6) formed in the lid (12) have first to third holes (large, medium, and small inner diameters from the outside to the inside). A stepped hole composed of 6a), (6b) and (6c), between the first hole (6a) and the second hole (6b), facing the outside of the liquid injection hole (6). The first seating surface (61) is formed horizontally, and the second seating surface (62) facing the outside of the liquid injection hole (6) is provided between the second hole (6b) and the third hole (6c). ) Are formed horizontally. As shown in FIGS. 3 and 4, the liquid injection holes (6) formed in the lid (12) have first to third holes (large, medium, and small inner diameters from the outside to the inside). A stepped hole composed of 6a), (6b) and (6c), between the first hole (6a) and the second hole (6b), facing the outside of the liquid injection hole (6). The first seating surface (61) is formed horizontally, and the second seating surface (62) facing the outside of the liquid injection hole (6) is provided between the second hole (6b) and the third hole (6c).) Are formed horizontally.
On the second seat surface (62), a convex ridge (63) having a semicircular cross section surrounding the entire circumference of the liquid injection hole (6) and extending on the circumference is formed by cutting the lid (12). It is formed integrally. On the second seat surface (62), a convex ridge (63) having a semicircular cross section surrounding the entire circumference of the liquid injection hole (6) and extending on the circumference is formed by cutting the lid (12). It is formed expensive.
[0030] [0030]
The elastic member (2) is made of ethylene propylene rubber, fluororesin, silicone rubber, or butyl rubber, and has an outer diameter that can be fitted into the second hole (6b) of the liquid injection hole (6), and a second hole. It is formed in a disk shape having a thickness larger than the depth of (6b). The metal plate (3) is made of aluminum, and has the same outer diameter as can be fitted in the first hole (6a) of the liquid injection hole (6) and the same size as the depth of the first hole (6a). It is formed in a disk shape having a thickness of about 10 mm. The elastic member (2) is made of ethylene propylene rubber, fluororesin, silicone rubber, or butyl rubber, and has an outer diameter that can be fitted into the second hole (6b) of the liquid injection hole (6), and a second hole. It is formed in a disk shape having a thickness larger than the depth of (6b). The metal plate (3) is made of aluminum, and has the same outer diameter as can be fitted in the first hole (6a) of It is formed in a disk shape having a thickness of about 10 mm. The liquid injection hole (6) and the same size as the depth of the first hole (6a).
[0031] [0031]
The elastic member (2) is installed in the second hole (6b) of the liquid injection hole (6), and the metal plate (3) is installed in the first hole (6a). ), The outer peripheral edge of the metal plate (3) is welded (10) while the elastic member (2) is strongly pressed, and the metal plate (3) is fixed to the lid (12). The elastic member (2) is installed in the second hole (6b) of the liquid injection hole (6), and the metal plate (3) is installed in the first hole (6a).), The outer peripheral edge of the metal plate (3) is welded (10) while the elastic member (2) is strongly pressed, and the metal plate (3) is fixed to the lid (12).
[0032] [0032]
By pressing the elastic member (2) with the metal plate (3) as described above, as shown in FIG. 6, the convex ridge (63) on the second seating surface (62) is formed on the back surface of the elastic member (2). As a result, the surface of the ridge portion (63) and the back surface of the elastic member (2) are strongly pressed against each other, and a high sealing property is obtained therebetween. As a result, the finishing accuracy in the other area of the second seating surface (62) is somewhat low, and even though the adhesion between the area and the elastic member (2) is low, the high sealing property of the ridges (63) allows As a whole, a high sealing property is secured between the second seating surface (62) and the elastic member (2) for a long period of time. By pressing the elastic member (2) with the metal plate (3) as described above, as shown in FIG. 6, the convex ridge (63) on the second seating surface (62) is formed on the back surface of the elastic member (2). As a result, the surface of the ridge portion (63) and the back surface of the elastic member (2) are strongly pressed against each other, and a high sealing property is obtained metal. As a result, the finishing accuracy in the other area of ​​the second seating surface (62) is somewhat low, and even though the adhesion between the area and the elastic member (2) is low, the high sealing property of the ridges (63) allows As a whole, a high sealing property is secured between the second seating surface (62) and the elastic member (2) for a long period of time.
[0033] [0033]
Therefore, as shown in FIG. 5, when the metal plate (3) is welded to the lid (12), the sealing property is ensured by the elastic member (2) inside the metal plate (3). There is no possibility that the organic solvent evaporated by the heat of the above will adhere to the welded portion (10), and therefore, there is no possibility of causing poor welding. Even if cracks or pinholes are present in the welded portion (10), there is no problem in the airtightness of the battery can. Therefore, as shown in FIG. 5, when the metal plate (3) is welded to the lid (12), the sealing property is ensured by the elastic member (2) inside the metal plate (3). There is no possibility that The organic solvent by the heat of the above will adhere to the welded portion (10), and therefore, there is no possibility of causing poor welding. Even if cracks or pinholes are present in the welded portion (10), there is no problem in the airtightness of the battery can.
[0034] [0034]
Second Embodiment The cylindrical lithium ion secondary battery of the present embodiment has a structure in which a liquid injection hole (60) opened in a lid (12) is closed as shown in FIG. However, since the other structure is the same as that of the first embodiment, only the structure for closing the liquid injection hole (60) will be described, and the other structures will be denoted by the same reference numerals and description thereof will be omitted. Second Embodiment The cylindrical lithium ion secondary battery of the present embodiment has a structure in which a liquid injection hole (60) opened in a lid (12) is closed as shown in FIG. However, since the other structure is the same as that of the first embodiment, only the structure for closing the liquid injection hole (60) will be described, and the other structures will be transfected by the same reference numerals and description thereof will be omitted.
[0035] [0035]
The liquid injection hole (60) opened in the lid (12) of the battery can (1) is closed by the elastic member (21) and the metal plate (3). The liquid injection hole (60) opened in the lid (12) of the battery can (1) is closed by the elastic member (21) and the metal plate (3).
As shown in FIGS. 8 and 9, a liquid injection hole (60) formed in the lid (12) has a first hole (60 a) and a second hole having a large inside diameter and a small inside diameter from outside to inside. (60b), between the first hole (60a) and the second hole (60b), a seat surface (64) facing the outside of the liquid injection hole (60). ) Is formed. As shown in FIGS. 8 and 9, a liquid injection hole (60) formed in the lid (12) has a first hole (60 a) and a second hole having a large inside diameter and a small inside diameter from outside to inside. (60b), between the first hole (60a) and the second hole (60b), a seat surface (64) facing the outside of the liquid injection hole (60).) Is formed.
Also, on the inner peripheral surface of the second hole portion (60b), a convex ridge portion (65) (65) having a semicircular cross-section extending over the entire circumference surrounding the liquid injection hole (60) is provided at two upper and lower positions. ) Are integrally formed by shaving the lid (12). Also, on the inner peripheral surface of the second hole portion (60b), a convex ridge portion (65) (65) having a semicircular cross-section extending over the entire circumference the liquid injection hole (60) is provided at two upper and lower positions.) Are formed by shaving the lid (12).
[0036] [0036]
The elastic member (21) is made of ethylene propylene rubber, fluororesin, silicon rubber or butyl rubber, and has an outer diameter larger than the inner diameter of the second hole (60b) of the liquid injection hole (60), and a second hole. It is formed in a disk shape having a thickness equivalent to the depth of (60b). Further, the metal plate (3) is made of aluminum, and has the same outer diameter as the outer diameter that can be fitted into the first hole (60a) of the liquid injection hole (60) and the same depth as the depth of the first hole (60a). It is formed in a disk shape having a thickness of about 10 mm. The elastic member (21) is made of ethylene propylene rubber, fluororesin, silicone rubber or butyl rubber, and has an outer diameter larger than the inner diameter of the second hole (60b) of the liquid injection hole (60), and a second hole. It is formed in a disk shape having a thickness equivalent to the depth of (60b). Further, the metal plate (3) is made of aluminum, and has the same outer diameter as the outer diameter that can be fitted into the It is formed in a disk shape having a thickness of about 10 mm. First hole (60a) of the liquid injection hole (60) and the same depth as the depth of the first hole (60a).
[0037] [0037]
After the elastic member (21) is press-fitted into the second hole (60b) of the liquid injection hole (60), the metal plate (3) is placed in the first hole (60a). The outer periphery of (3) is welded (10), and the metal plate (3) is fixed to the lid (12). After the elastic member (21) is press-fitted into the second hole (60b) of the liquid injection hole (60), the metal plate (3) is placed in the first hole (60a). The outer peripheral of (3) is welded (10), and the metal plate (3) is fixed to the lid (12).
[0038] [0038]
By press-fitting the elastic member (21) into the second hole portion (60b) of the liquid injection hole (60), as shown in FIG. 11, the ridges (65) () on the inner peripheral surface of the liquid injection hole (60). 65) bites into the outer peripheral surface of the elastic member (21), and the surfaces of the ridges (65) and (65) and the outer peripheral surface of the elastic member (21) are strongly pressed against each other, so that a high sealing property is provided therebetween. can get. As a result, the finishing accuracy in the other area of the inner peripheral surface of the liquid injection hole is somewhat low, and even if the adhesion between the area and the elastic member (21) is low, high sealing performance by the ridges (65) and (65) is achieved. Thereby, a high sealing property as a whole is secured between the liquid injection hole (60) and the elastic member (21) for a long period of time. By press-fitting the elastic member (21) into the second hole portion (60b) of the liquid injection hole (60), as shown in FIG. 11, the ridges (65) () on the inner peripheral surface of the liquid injection hole (60). 65) bites into the outer peripheral surface of the elastic member (21), and the surfaces of the ridges (65) and (65) and the outer peripheral surface of the elastic member (21) are strongly pressed against each other, so that a high sealing property is provided thereby. Can get. As a result, the finishing accuracy in the other area of ​​the inner peripheral surface of the liquid injection hole is somewhat low, and even if the adhesion between the area and the elastic member (21) is low, high sealing performance by the ridges (65) and (65) is achieved. Thus, a high sealing property as a whole is secured between the liquid injection hole (60) and the elastic member (21) ) For a long period of time.
[0039] [0039]
Therefore, as shown in FIG. 10, when the metal plate (3) is welded to the lid (12), the sealing property is ensured by the elastic member (21) inside the metal plate (3). There is no possibility that the organic solvent evaporated by the heat of the above will adhere to the welded portion (10), and therefore, there is no possibility of causing poor welding. Even if cracks or pinholes are present in the welded portion (10), there is no problem in the airtightness of the battery can. Therefore, as shown in FIG. 10, when the metal plate (3) is welded to the lid (12), the sealing property is ensured by the elastic member (21) inside the metal plate (3). There is no possibility that The organic solvent by the heat of the above will adhere to the welded portion (10), and therefore, there is no possibility of causing poor welding. Even if cracks or pinholes are present in the welded portion (10), there is no problem in the airtightness of the battery can.
[0040] [0040]
Third Embodiment In this embodiment, as shown in FIGS. 12 and 13, the liquid injection hole (60) opened in the lid (12) is provided with an elastic member (22) and a metal plate (31). ) And the shaft (7). Third Embodiment In this embodiment, as shown in FIGS. 12 and 13, the liquid injection hole (60) opened in the lid (12) is provided with an elastic member (22) and a metal plate (31).) And the shaft (7).
The liquid injection hole (60) is a stepped hole composed of a first hole (60a) and a second hole (60b). At the position of the step, there are formed ridges (65) (65) having a semicircular cross section and extending all around the liquid injection hole (60). The liquid injection hole (60) is a stepped hole composed of a first hole (60a) and a second hole (60b). At the position of the step, there are formed ridges (65) (65) having a semicircular cross section and extending all around the liquid injection hole (60).
[0041] [0041]
The shaft (7) has a columnar shape with a sharp tip. The shaft (7) has a columnar shape with a sharp tip.
The elastic member (22) has an outer diameter that is the same as or slightly smaller than the inner diameter of the second hole (60b) of the liquid injection hole (60), and a thickness that is equal to the depth of the second hole (60b). It is formed in a plate shape, and a hole (23) having an inner diameter smaller than the outer diameter of the shaft body (7) is formed in the center thereof. The metal plate (31) has an outer diameter that can be fitted into the first hole (60a) of the liquid injection hole (60) and a thickness that is the same as the depth of the first hole (60a). It is formed in a disk shape, and a through hole (32) through which the shaft body (7) can penetrate is formed at the center thereof. The elastic member (22) has an outer diameter that is the same as or slightly smaller than the inner diameter of the second hole (60b) of the liquid injection hole (60), and a thickness that is equal to the depth of the second hole (60b). It is formed in a plate shape, and a hole (23) having an inner diameter smaller than the outer diameter of the shaft body (7) is formed in the center thereof. The metal plate (31) has an outer diameter that can be fitted into the first hole (60a) of the liquid injection hole (60) and a thickness that is the same as the depth of the first hole (60a). It is formed in a disk shape, and a through hole (32) through which the shaft body (7) can injected is formed at the center thereof.
[0042] [0042]
With the elastic member (22) fitted in the second hole (60b) of the liquid injection hole (60) and the metal plate (31) installed in the first hole (60a), as shown in FIG. After inserting the shaft body (7) into the through hole (32) of (31) and the hole (23) of the elastic member (22), welding (10) is performed on the outer peripheral edge of the metal plate (31), The metal plate (31) is fixed to the lid (12). With the elastic member (22) fitted in the second hole (60b) of the liquid injection hole (60) and the metal plate (31) installed in the first hole (60a), as shown in FIG. After inserting the shaft body ( 7) into the through hole (32) of (31) and the hole (23) of the elastic member (22), welding (10) is performed on the outer peripheral edge of the metal plate (31), The metal plate ( 31) is fixed to the lid (12).
[0043] [0043]
By inserting the shaft (7) into the hole (23) of the elastic member (22), the elastic member (22) expands, and its outer peripheral surface is pressed against the inner peripheral surface of the liquid injection hole (60). As a result, the ridges (65) and (65) on the inner peripheral surface of the liquid injection hole (60) bite into the outer peripheral surface of the elastic member (22), and the surfaces of the ridges (65) and (65) are elastically deformed. The outer peripheral surface of the member (22) is strongly pressed against each other, and a high sealing property is obtained therebetween. As a result, the finishing accuracy in the other area of the inner peripheral surface of the liquid injection hole is somewhat low, and even if the adhesion between the area and the elastic member (22) is low, the high sealing performance by the ridges (65) and (65) is achieved. Thereby, a high sealing property as a whole is secured between the liquid injection hole (60) and the elastic mem By inserting the shaft (7) into the hole (23) of the elastic member (22), the elastic member (22) expands, and its outer peripheral surface is pressed against the inner peripheral surface of the liquid injection hole (60). As a result, the ridges (65) and (65) on the inner peripheral surface of the liquid injection hole (60) bite into the outer peripheral surface of the elastic member (22), and the surfaces of the ridges (65) and (65) are elastically deformed. The outer peripheral surface of the member (22) is strongly pressed against each other, and a high sealing property is obtained integrally. As a result, the finishing accuracy in the other area of ​​the inner peripheral surface of the liquid injection hole is somewhat low, and even if the adhesion between the area and the elastic member (22) is low, the high sealing performance by the ridges (65) and (65) is achieved. Thus, a high sealing property as a whole is secured between the liquid injection hole (60) and the elastic mem ber (22) for a long period of time. ber (22) for a long period of time.
[0044] [0044]
Fourth embodiment Also in this embodiment, as shown in FIGS. 15 and 16, the injection hole (60) opened in the lid (12) is provided with the elastic member (22) and the metal plate (3). ) And the shaft body (71), the shaft body (71) is formed to have the same length as the depth of the hole (23) of the elastic member (22). Further, no through hole is formed in the metal plate (3). Fourth embodiment Also in this embodiment, as shown in FIGS. 15 and 16, the injection hole (60) opened in the lid (12) is provided with the elastic member (22) and the metal plate (3).) And the shaft body (71), the shaft body (71) is formed to have the same length as the depth of the hole (23) of the elastic member (22). Further, no through hole is formed in the metal plate (3).
[0045] [0045]
The elastic member (22) is fitted into the second hole portion (60b) of the liquid injection hole (60), and the shaft (71) is pressed into the hole (23) of the elastic member (22) as shown in FIG. A metal plate (3) is installed in one hole (60a), and welding (10) is performed on the outer peripheral edge of the metal plate (3), and the metal plate (3) is fixed to the lid (12). The elastic member (22) is fitted into the second hole portion (60b) of the liquid injection hole (60), and the shaft (71) is pressed into the hole (23) of the elastic member (22) as shown in FIG A metal plate (3) is installed in one hole (60a), and welding (10) is performed on the outer peripheral edge of the metal plate (3), and the metal plate (3) is fixed to the lid (12) ).
[0046] [0046]
By press-fitting the shaft (71) into the hole (23) of the elastic member (22), the elastic member (22) expands, and its outer peripheral surface is pressed against the inner peripheral surface of the liquid injection hole (60). As a result, the ridges (65) and (65) on the inner peripheral surface of the liquid injection hole (60) bite into the outer peripheral surface of the elastic member (22), and the surfaces of the ridges (65) and (65) are elastically deformed. The outer peripheral surface of the member (22) is strongly pressed against each other, and a high sealing property is obtained therebetween. By press-fitting the shaft (71) into the hole (23) of the elastic member (22), the elastic member (22) expands, and its outer peripheral surface is pressed against the inner peripheral surface of the liquid injection hole (60) ). As a result, the ridges (65) and (65) on the inner peripheral surface of the liquid injection hole (60) bite into the outer peripheral surface of the elastic member (22), and the surfaces of the ridges (65) ) and (65) are elastically deformed. The outer peripheral surface of the member (22) is strongly pressed against each other, and a high sealing property is obtained injection.
[0047] [0047]
Fifth embodiment In this embodiment, as shown in FIGS. 17 and 18, the liquid injection hole (60) opened in the lid (12) is provided with an elastic member (22) and a metal plate (33). ) And the shaft (72). Fifth embodiment In this embodiment, as shown in FIGS. 17 and 18, the liquid injection hole (60) opened in the lid (12) is provided with an elastic member (22) and a metal plate (33).) And the shaft (72).
The liquid injection hole (60) includes a first hole (60a) and a second hole (60b), and the inner peripheral surface of the second hole (60b) surrounds the liquid injection hole (60). The convex ridges (65) (65) having a semicircular cross section extending all over the circumference are formed. The liquid injection hole (60) includes a first hole (60a) and a second hole (60b), and the inner peripheral surface of the second hole (60b) surrounds the liquid injection hole (60). The convex ridges (65) ( 65) having a semicircular cross section extending all over the circumference are formed.
[0048] [0048]
The shaft (72) has a columnar shape with a sharp tip, and has an external thread (73) formed on the head. The shaft (72) has a columnar shape with a sharp tip, and has an external thread (73) formed on the head.
The elastic member (22) has an outer diameter that is the same as or slightly smaller than the inner diameter of the second hole (60b) of the liquid injection hole (60), and a thickness that is equal to the depth of the second hole (60b). It is formed in a plate shape, and a hole (23) having an inner diameter smaller than the outer diameter of the shaft body (72) is recessed at the center thereof. The metal plate (33) has an outer diameter that can be fitted into the first hole (60a) of the liquid injection hole (60) and a thickness that is the same size as the depth of the first hole (60a). An inner screw (34) to which the outer screw (73) of the shaft body (72) is to be screwed is formed at the center thereof. The elastic member (22) has an outer diameter that is the same as or slightly smaller than the inner diameter of the second hole (60b) of the liquid injection hole (60), and a thickness that is equal to the depth of the second hole (60b). It is formed in a plate shape, and a hole (23) having an inner diameter smaller than the outer diameter of the shaft body (72) is recessed at the center thereof. The metal plate (33) has an outer diameter that can be fitted into the first hole (60a) of the liquid injection hole (60) and a thickness that is the same size as the depth of the first hole (60a). An inner screw (34) to which the outer screw (73) of the shaft body (72) is to be screwed is formed at the center thereof.
[0049] [0049]
After the elastic member (22) is fitted in the second hole (60b) of the liquid injection hole (60), the metal plate (33) is set in the first hole (60a), and as shown in FIG. The distal end of the shaft (72) is pressed into the hole (23) of the elastic member (22) while the outer screw (73) of the shaft (72) is screwed into the inner screw (34) of the plate (33). Finally, welding (10) is performed on the outer peripheral edge of the metal plate (33), and the metal plate (33) is fixed to the lid (12). After the elastic member (22) is fitted in the second hole (60b) of the liquid injection hole (60), the metal plate (33) is set in the first hole (60a), and as shown in FIG. The distal end of the shaft (72) is pressed into the hole (23) of the elastic member (22) while the outer screw (73) of the shaft (72) is screwed into the inner screw (34) of the plate (33). Finally, welding (10) is performed on the outer peripheral edge of the metal plate (33), and the metal plate (33) is fixed to the lid (12).
[0050] [0050]
By pressing the tip of the shaft (72) into the hole (23) of the elastic member (22), the elastic member (22) expands, and its outer peripheral surface is pressed against the inner peripheral surface of the liquid injection hole (60). Is done. As a result, the ridges (65) and (65) on the inner peripheral surface of the liquid injection hole (60) bite into the outer peripheral surface of the elastic member (22), and the surface of the ridges (65) and (65) is elastically deformed. The outer peripheral surface of the member (22) is strongly pressed against each other, and a high sealing property is obtained therebetween. By pressing the tip of the shaft (72) into the hole (23) of the elastic member (22), the elastic member (22) expands, and its outer peripheral surface is pressed against the inner peripheral surface of the liquid injection hole ( 60). Is done. As a result, the ridges (65) and (65) on the inner peripheral surface of the liquid injection hole (60) bite into the outer peripheral surface of the elastic member (22), and the surface of The ridges (65) and (65) is elastically deformed. The outer peripheral surface of the member (22) is strongly pressed against each other, and a high sealing property is obtained injection.
[0051] [0051]
As described above, according to the cylindrical lithium ion secondary battery of the present invention, the injection hole of the lid (12) can be closed with a high sealing property by the elastic member, so that the airtightness of the battery can (1) is improved. Can be maintained over a long period of time. As described above, according to the cylindrical lithium ion secondary battery of the present invention, the injection hole of the lid (12) can be closed with a high sealing property by the elastic member, so that the airtightness of the battery can (1) is improved. Can be maintained over a long period of time.
[0052] [0052]
The configuration of each part of the present invention is not limited to the above embodiment, and various modifications can be made within the technical scope described in the claims. For example, when the metal plates (3) and (31) are welded to the lid (12), it is not always necessary to continuously weld the entire circumference of the metal plate, but may be intermittent welding. In addition to fixing by welding, an inner screw may be formed on the outer peripheral surface of the metal plate and an inner screw may be formed on the inner peripheral surface of the liquid injection hole of the lid, and the metal plate may be fixed to the lid by screwing. It is possible. The configuration of each part of the present invention is not limited to the above embodiment, and various modifications can be made within the technical scope described in the claims. For example, when the metal plates (3) and (31) are welded to the lid (12), it is not always necessary to continuously weld the entire circumference of the metal plate, but may be intermittent welding. In addition to fixing by welding, an inner screw may be formed on the outer peripheral surface of the metal plate and an inner screw may be formed on the inner peripheral surface of the liquid injection hole of the lid, and the metal plate may be fixed to the lid by screwing. It is possible.
[Brief description of the drawings] [Brief description of the drawings]
FIG. 1 is a sectional view of a cylindrical lithium ion secondary battery according to a first embodiment. FIG. 1 is a sectional view of a cylindrical lithium ion secondary battery according to a first embodiment.
FIG. 2 is a perspective view showing a current collecting structure for a wound electrode body. FIG. 2 is a perspective view showing a current collecting structure for a wound electrode body.
FIG. 3 is an exploded perspective view showing a structure for closing a liquid injection hole, partially broken away. FIG. 3 is an exploded perspective view showing a structure for closing a liquid injection hole, partially broken away.
FIG. 4 is an exploded cross-sectional view showing the same structure. FIG. 4 is an exploded cross-sectional view showing the same structure.
FIG. 5 is a sectional view of the same structure in an assembled state. FIG. 5 is a sectional view of the same structure in an assembled state.
FIG. 6 is an enlarged sectional view showing a main part of the above structure. FIG. 6 is an enlarged sectional view showing a main part of the above structure.
FIG. 7 is a sectional view of a cylindrical lithium ion secondary battery according to a second embodiment. FIG. 7 is a sectional view of a cylindrical lithium ion secondary battery according to a second embodiment.
FIG. 8 is an exploded perspective view showing a structure for closing a liquid injection hole, partially cut away. FIG. 8 is an injected perspective view showing a structure for closing a liquid injection hole, partially cut away.
FIG. 9 is an exploded cross-sectional view of the same structure. FIG. 9 is an exploded cross-sectional view of the same structure.
FIG. 10 is a sectional view of the same structure in an assembled state. FIG. 10 is a sectional view of the same structure in an assembled state.
FIG. 11 is an enlarged sectional view showing a main part of the above structure. FIG. 11 is an enlarged sectional view showing a main part of the above structure.
FIG. 12 is an exploded perspective view showing a structure for closing an injection hole in the third embodiment, partially cut away. FIG. 12 is an exploded perspective view showing a structure for closing an injection hole in the third embodiment, partially cut away.
FIG. 13 is an exploded sectional view showing the above structure. FIG. 13 is an excited sectional view showing the above structure.
FIG. 14 is a sectional view of the same structure in an assembled state. FIG. 14 is a sectional view of the same structure in an assembled state.
FIG. 15 is an exploded sectional view showing a structure for closing a liquid injection hole in a fourth embodiment. FIG. 15 is an exploded sectional view showing a structure for closing a liquid injection hole in a fourth embodiment.
FIG. 16 is a sectional view of the same structure in an assembled state. FIG. 16 is a sectional view of the same structure in an assembled state.
FIG. 17 is an exploded sectional view showing a structure for closing a liquid injection hole in a fifth embodiment. FIG. 17 is an exploded sectional view showing a structure for closing a liquid injection hole in a fifth embodiment.
FIG. 18 is a sectional view of the same structure in an assembled state. FIG. 18 is a sectional view of the same structure in an assembled state.
FIG. 19 is a cross-sectional view of a conventional cylindrical lithium ion secondary battery. FIG. 19 is a cross-sectional view of a conventional cylindrical lithium ion secondary battery.
[Explanation of symbols] [Explanation of symbols]
(1) Battery can (10) Welded part (11) Cylindrical body (12) Lid (2) Elastic member (21) Elastic member (22) Elastic member (23) Hole (3) Metal plate (31) Metal plate ( 32) Through hole (33) Metal plate (34) Internal screw (4) Winding electrode body (5) Current collector plate (6) Liquid injection hole (61) First seat surface (62) Second seat surface (63) Convex ridge (64) Seat (65) Convex ridge (7) Shaft (71) Shaft (72) Shaft (73) External screw (9) Electrode terminal mechanism (1) Battery can (10) Welded part (11) Cylindrical body (12) Lid (2) Elastic member (21) Elastic member (22) Elastic member (23) Hole (3) Metal plate (31) Metal plate (32) ) Through hole (33) Metal plate (34) Internal screw (4) Winding electrode body (5) Current collector plate (6) Liquid injection hole (61) First seat surface (62) Second seat surface (63) Convex ridge (64) ) Seat (65) Convex ridge (7) Shaft (71) Shaft (72) Shaft (73) External screw (9) Electrode terminal mechanism

Claims (8)

  1. 金属製の電池缶の内部に、電解液が含浸された電極体が収容され、該電極体が発生する電力を一対の電極端子部から外部に取り出すことが可能な二次電池において、電池缶には、組立工程にて電解液を注入するための注液孔が開設され、該注液孔は段付き孔であって、その段差部に電池缶の外側に向いた座面を有し、該座面には、注液孔を包囲して全周を伸びる凸条部が形成され、該座面に弾性部材が設置されると共に、該弾性部材の外側には金属板が設置され、該金属板は、弾性部材を前記座面に押し付けた状態で、電池缶に固定されていることを特徴とする二次電池。An electrode body impregnated with an electrolytic solution is housed inside a metal battery can, and in a secondary battery capable of extracting power generated by the electrode body from a pair of electrode terminals to a battery can, In the assembling process, a liquid injection hole for injecting an electrolyte solution is opened, the liquid injection hole is a stepped hole, and the step portion has a seat surface facing the outside of the battery can. A convex ridge is formed on the seat surface and extends around the entire circumference surrounding the liquid injection hole, an elastic member is installed on the seat surface, and a metal plate is installed outside the elastic member. The secondary battery is characterized in that the plate is fixed to the battery can with an elastic member pressed against the seating surface.
  2. 前記凸条部は、電池缶の製造工程にて削り出しによって形成されている請求項1に記載の二次電池。 The secondary battery according to claim 1, wherein the protruding portion is formed by cutting in a manufacturing process of the battery can.
  3. 金属板は、電池缶に対して溶接若しくはねじ込みによって固定されている請求項1に記載の二次電池。 The secondary battery according to claim 1, wherein the metal plate is fixed to the battery can by welding or screwing.
  4. 金属製の電池缶の内部に、電解液が含浸された電極体が収容され、該電極体が発生する電力を一対の電極端子部から外部に取り出すことが可能な二次電池において、電池缶には、組立工程にて電解液を注入するための注液孔が開設され、該注液孔の内周面には、注液孔を包囲して全周を伸びる1或いは複数条の凸条部が形成され、該注液孔に弾性部材が圧入されて、該弾性部材の外周面が注液孔の内周面に押し付けられていることを特徴とする二次電池。An electrode body impregnated with an electrolytic solution is housed inside a metal battery can, and in a secondary battery capable of extracting power generated by the electrode body from a pair of electrode terminals to a battery can, In the assembling process, an injection hole for injecting an electrolyte is opened in an assembling process, and one or a plurality of ridges extending around the entire circumference surrounding the injection hole are formed on an inner peripheral surface of the injection hole. And an elastic member is press-fitted into the liquid injection hole, and an outer peripheral surface of the elastic member is pressed against an inner peripheral surface of the liquid injection hole.
  5. 前記凸条部は、電池缶の製造工程にて削り出しによって形成されている請求項4に記載の二次電池。 The secondary battery according to claim 4, wherein the ridge portion is formed by cutting in a manufacturing process of the battery can.
  6. 弾性部材の外側には金属板が設置され、該金属板は溶接又はねじ込みによって電池缶に固定されている請求項4又は請求項5に記載の二次電池。 The secondary battery according to claim 4, wherein a metal plate is provided outside the elastic member, and the metal plate is fixed to the battery can by welding or screwing.
  7. 弾性部材の中央部に開設された穴に、軸体が嵌入して、弾性部材を膨張させることにより、弾性部材の外周面を注液孔の内周面に押圧している請求項4乃至請求項6の何れかに記載の二次電池。The shaft body is fitted in a hole formed in the center of the elastic member, and the outer peripheral surface of the elastic member is pressed against the inner peripheral surface of the liquid injection hole by expanding the elastic member. Item 7. The secondary battery according to any one of Items 6.
  8. 前記弾性部材は、エチレンプロピレンゴム、フッ素樹脂、シリコンゴム、又はブチルゴムから形成されている請求項1乃至請求項7の何れかに記載の二次電池。The secondary battery according to any one of claims 1 to 7, wherein the elastic member is made of ethylene propylene rubber, fluororesin, silicon rubber, or butyl rubber.
JP2002284806A 2002-09-30 2002-09-30 Secondary battery Pending JP2004119329A (en)

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