JP6014161B2 - Method for manufacturing rectangular energy storage device - Google Patents

Method for manufacturing rectangular energy storage device Download PDF

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Publication number
JP6014161B2
JP6014161B2 JP2014544072A JP2014544072A JP6014161B2 JP 6014161 B2 JP6014161 B2 JP 6014161B2 JP 2014544072 A JP2014544072 A JP 2014544072A JP 2014544072 A JP2014544072 A JP 2014544072A JP 6014161 B2 JP6014161 B2 JP 6014161B2
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injection hole
sealing
liquid injection
sealing plug
manufacturing
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JPWO2014068641A1 (en
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佳佑 澤田
佳佑 澤田
浩一 梶原
浩一 梶原
博昭 江川
博昭 江川
勇人 小口
勇人 小口
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Hitachi Astemo Ltd
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Hitachi Automotive Systems Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
    • H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
    • H01M50/627—Filling ports
    • H01M50/636—Closing or sealing filling ports, e.g. using lids
    • H01M50/645—Plugs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Filling, Topping-Up Batteries (AREA)
  • Electric Double-Layer Capacitors Or The Like (AREA)

Description

この発明は、角形蓄電素子の製造方法に関し、より詳細には、電解液を注入する注液孔を封止栓により封止する封止構造を備える角形蓄電素子の製造方法に関する。
This invention relates to a manufacturing method of square-shaped storage element, and more particularly to a method for producing a square-shaped battery elements that Ru comprising a sealing structure for sealing by the sealing plug the injection hole for injecting an electrolyte solution.

リチウムイオン等の角形二次電池は、電池容器内に発電要素が収容され、電解液が注入されている。電解液は、電池容器の一側面に設けられた注液孔から電池容器内に注入され、注入後、注液孔は封止栓により封止される。封止栓は、通常、レーザ溶接などにより注液孔の周囲において電池容器に接合される。   In a rectangular secondary battery such as lithium ion, a power generation element is accommodated in a battery container, and an electrolyte is injected. The electrolytic solution is injected into the battery container from a liquid injection hole provided on one side surface of the battery container. After the injection, the liquid injection hole is sealed with a sealing plug. The sealing plug is usually joined to the battery container around the liquid injection hole by laser welding or the like.

注液孔を封止栓により封止する構造では、注液孔と注液栓との隙間に電解液が浸透し、溶接不良が発生することがある。この対応として、封止栓を、電池容器の注液孔の周縁部に載置される金属製封孔本体と、注液孔内に挿通されるゴム栓体とで構成することが知られている（例えば、特許文献１参照）。この構造では、ゴム栓体に突起部を設けて注液孔内に圧入したり、注液孔およびゴム栓体を円錐台形状に形成し、ゴム栓体を注液孔に圧入したりして封止する。   In the structure in which the liquid injection hole is sealed with the sealing plug, the electrolyte may permeate into the gap between the liquid injection hole and the liquid injection plug, resulting in poor welding. As this correspondence, it is known that the sealing plug is composed of a metal sealing body placed on the peripheral edge of the liquid injection hole of the battery container and a rubber plug inserted into the liquid injection hole. (For example, refer to Patent Document 1). In this structure, a protrusion is provided on the rubber plug and press-fitted into the liquid injection hole, or the liquid injection hole and the rubber plug are formed in a truncated cone shape, and the rubber plug is pressed into the liquid injection hole. Seal.

日本国特許公開２００１−３１３０２２号公報Japanese Patent Publication 2001-313022

上記特許文献１に記載された発明では、封止栓を注液栓に圧入して封止する。このため、封止栓を注液口に圧入する際、電池容器の注液孔の側壁部から、電池容器を構成する金属材料が粒子として脱落し、電池容器内部に落下する可能性がある。電池容器内には、発電要素と電解液が収容されているため、金属粒子は、発電要素の正・負極活物質層間に入り込み、内部短絡等の不具合発生の要因となる。   In the invention described in Patent Document 1, the sealing stopper is press-fitted into the liquid injection stopper and sealed. For this reason, when the sealing plug is press-fitted into the liquid injection port, the metal material constituting the battery container may fall out as particles from the side wall of the liquid injection hole of the battery container and fall into the battery container. Since the power generation element and the electrolytic solution are accommodated in the battery container, the metal particles enter between the positive and negative electrode active material layers of the power generation element and cause a problem such as an internal short circuit.

本発明の第１の態様によると、角形蓄電素子の製造方法は、容器内に発電要素を収容し、容器の一側面に設けられた注液孔から容器内に電解液を注入する第１の工程と、注液孔内に、シール部材の筒状部を挿通する第２の工程と、シール部材の筒状部内に、嵌入部を有する封止栓を圧入する第３の工程と、シール部材の筒状部が、封止栓の嵌入部と容器の注液孔の周縁部側面との間で圧縮された状態で、封止栓の鍔部の外周縁を容器に接合する第４の工程と、を備え、第２の工程における、シール部材の筒状部の外径は注液孔の直径より小さく形成され、第３の工程における、封止栓の嵌入部の外径はシール部材の筒状部の内径よりも大きく形成され、第４の工程は、シール部材の筒状部を、封止栓の嵌入部により拡張して、シール部材の筒状部を、封止栓の嵌入部と容器の注液孔の周縁部側面との間に圧縮する工程を含み、第１の工程から第４の工程を、上記の順に行う。
本発明の第２の態様によると、注液孔の直径と封止栓の嵌入部の外径との差は、シール部材の筒状部の外径とシール部材の筒状部の内径との差よりも小さい。
本発明の第３の態様によると、封止栓は、鍔部と嵌入部との中央部に連通して形成された中空部を有する。
本発明の第４の態様によると、シール部材は、注液孔の周縁部に搭載される鍔状部を有する。
本発明の第５の態様によると、シール部材は、筒状部における鍔状部と反対側に底部を有する。
本発明の第６の態様によると、封止栓の嵌入部の底部とシール部材の底部との間に隙間が設けられている。
本発明の第７の態様によると、容器は、注液孔の周縁部に凹部を有し、シール部材の鍔状部は、凹部の底面上に配置されている。
本発明の第８の態様によると、シール部材の鍔状部の外径は、封止栓の鍔部の外径より小さく形成されている。 According to the first aspect of the present invention, there is provided a first method for manufacturing a rectangular electricity storage element , in which a power generation element is accommodated in a container and an electrolyte is injected into the container from a liquid injection hole provided on one side surface of the container. A step, a second step of inserting the cylindrical portion of the seal member into the liquid injection hole, a third step of press-fitting a sealing plug having a fitting portion into the cylindrical portion of the seal member, and the seal member 4th process which joins the outer periphery of the collar part of a sealing plug to a container in the state compressed between between the insertion part of a sealing plug, and the peripheral part side surface of the liquid injection hole of a container And the outer diameter of the cylindrical portion of the sealing member in the second step is smaller than the diameter of the liquid injection hole, and the outer diameter of the fitting portion of the sealing plug in the third step is that of the sealing member In the fourth step, the cylindrical portion of the seal member is expanded by the fitting portion of the sealing plug, and the fourth step is performed. The section includes the step of compressing between the peripheral side surface of the injection hole of the fitting portion and the container sealing member, the fourth step from the first step, performed in the order described above.
According to the second aspect of the present invention, the difference between the diameter of the liquid injection hole and the outer diameter of the fitting portion of the sealing plug is the difference between the outer diameter of the cylindrical portion of the sealing member and the inner diameter of the cylindrical portion of the sealing member. Smaller than the difference.
According to the third aspect of the present invention, the sealing plug has a hollow portion formed in communication with the central portion of the collar portion and the fitting portion.
According to the fourth aspect of the present invention, the seal member has a hook-shaped portion mounted on the peripheral edge portion of the liquid injection hole.
According to the 5th aspect of this invention, a sealing member has a bottom part on the opposite side to the collar-shaped part in a cylindrical part.
According to the 6th aspect of this invention, the clearance gap is provided between the bottom part of the insertion part of a sealing plug, and the bottom part of a sealing member.
According to the 7th aspect of this invention, a container has a recessed part in the peripheral part of a liquid injection hole, and the hook-shaped part of a sealing member is arrange | positioned on the bottom face of a recessed part.
According to the 8th aspect of this invention, the outer diameter of the collar part of a sealing member is formed smaller than the outer diameter of the collar part of a sealing plug .

本発明によれば、封止栓と注液孔との間に、注液孔に挿通されるシール部材の筒状部が介在するので、容器を構成する材料が粒子として注液孔の周縁部側面から脱落するのを防止することができる。   According to the present invention, since the cylindrical portion of the seal member inserted through the liquid injection hole is interposed between the sealing stopper and the liquid injection hole, the material constituting the container is the peripheral portion of the liquid injection hole as particles. It can prevent falling off from the side.

本発明に係る角形蓄電素子の一実施の形態としての角形二次電池の外観斜視図。1 is an external perspective view of a prismatic secondary battery as an embodiment of a prismatic storage element according to the present invention. 図１に示された角形二次電池の分解斜視図。FIG. 2 is an exploded perspective view of the prismatic secondary battery shown in FIG. 1. 図２に図示された発電要素を、その捲回終端部側を展開した状態の斜視図。The perspective view of the state which expand | deployed the winding termination | terminus part side of the electric power generation element shown in FIG. 注液孔の封止構造の拡大分解斜視図。The expansion disassembled perspective view of the sealing structure of a liquid injection hole. 図４を側方から観た断面図。Sectional drawing which looked at FIG. 4 from the side. 注液孔の封止方法を説明するための断面図。Sectional drawing for demonstrating the sealing method of a liquid injection hole. 図６に続く工程を説明するための断面図。Sectional drawing for demonstrating the process following FIG. 注液孔の封止方法の変形例を説明するための図であり、（ａ）は圧入用の治具の側面図、（ｂ）は注液口に封止栓を挿入した状態の断面図。It is a figure for demonstrating the modification of the sealing method of a liquid injection hole, (a) is a side view of the jig for press injection, (b) is sectional drawing of the state which inserted the sealing stopper in the liquid injection port . 図８（ｂ）に図示された封止構造の平面図。FIG. 9 is a plan view of the sealing structure illustrated in FIG. 本発明の実施形態２を示す注液孔の封止構造の断面図。Sectional drawing of the sealing structure of the injection hole which shows Embodiment 2 of this invention. 本発明の実施形態３を示す注液孔の封止構造の断面図。Sectional drawing of the sealing structure of the injection hole which shows Embodiment 3 of this invention.

--実施形態１--
［角形蓄電素子の全体構造］
以下、この発明の角形蓄電素子およびその製造方法の一実施形態を図面と共に説明する。
図１は、この発明の角形蓄電素子の一実施の形態としての角形二次電池の外観斜視図であり、図２は、図１に示された角形二次電池の分解斜視図である。以下の説明では、角形二次電池をリチウムイオン角形二次電池として説明する。
図１に示すように、角形二次電池１００Ａは、電池缶１０１と電池蓋１０２とから構成される電池容器（容器）１０３を備えている。電池缶１０１および電池蓋１０２の材質は、例えば、アルミニウムまたはアルミニウム合金などのアルミニウム系金属である。--Embodiment 1--
[Overall structure of square energy storage device]
Hereinafter, an embodiment of a rectangular electricity storage device and a manufacturing method thereof according to the present invention will be described with reference to the drawings.
FIG. 1 is an external perspective view of a prismatic secondary battery as an embodiment of the prismatic storage element of the present invention, and FIG. 2 is an exploded perspective view of the prismatic secondary battery shown in FIG. In the following description, the prismatic secondary battery is described as a lithium ion prismatic secondary battery.
As shown in FIG. 1, the rectangular secondary battery 100 </ b> A includes a battery container (container) 103 including a battery can 101 and a battery lid 102. The material of the battery can 101 and the battery lid 102 is, for example, an aluminum metal such as aluminum or an aluminum alloy.

電池蓋１０２は、矩形平板状であって、電池缶１０１の開口を塞ぐように接合されている。つまり、電池蓋１０２は、電池缶１０１を封止している。電池蓋１０２には、正極端子１４１および負極端子１５１が配設されている。また、電池蓋１０２には、ガス排出弁１０４が設けられている。ガス排出弁１０４は、プレス加工によって電池蓋１０２を部分的に薄肉化することで形成されている。ガス排出弁１０４には、開裂時に大きな開口が形成されるように開裂溝が形成されている。ガス排出弁１０４は、角形二次電池１００Ａが過充電等の異常により発熱して内部にガスが発生し、電池容器１０３内の圧力が上昇して所定圧力に達したときに開裂して、内部からガスを排出することで電池容器１０３内の圧力を低減させる。   The battery lid 102 has a rectangular flat plate shape and is joined so as to close the opening of the battery can 101. That is, the battery lid 102 seals the battery can 101. The battery lid 102 is provided with a positive terminal 141 and a negative terminal 151. The battery cover 102 is provided with a gas discharge valve 104. The gas discharge valve 104 is formed by partially thinning the battery lid 102 by press working. The gas discharge valve 104 is formed with a cleavage groove so that a large opening is formed at the time of cleavage. The gas discharge valve 104 is heated when the rectangular secondary battery 100A generates heat due to an abnormality such as overcharge, and gas is generated therein. When the pressure in the battery container 103 increases and reaches a predetermined pressure, the gas discharge valve 104 is opened. The pressure in the battery container 103 is reduced by discharging the gas from the battery.

電池蓋１０２には、電池容器１０３内に電解液を注入するための注液口１１０（図２参照）が形成されている。注液口１１０は、封止栓１２０およびシール部材１３０により封止されている。封止栓１２０の外周は、注液口１１０の周囲における電池蓋１０２の部分に、レーザ溶接等により接合されている。封止栓１２０およびシール部材１３０による注液口１１０の封止構造の詳細については後述する。   The battery lid 102 is formed with a liquid injection port 110 (see FIG. 2) for injecting an electrolytic solution into the battery container 103. The liquid injection port 110 is sealed with a sealing plug 120 and a seal member 130. The outer periphery of the sealing plug 120 is joined to the portion of the battery lid 102 around the liquid injection port 110 by laser welding or the like. The details of the sealing structure of the liquid injection port 110 by the sealing plug 120 and the sealing member 130 will be described later.

図２に示すように、電池缶１０１には発電要素１７０が収容されている。電池缶１０１は、一対の幅広面１０１ａと一対の幅狭面１０１ｂと底面１０１ｃとを有し、上面が開口された矩形箱状に形成されている。発電要素１７０は、絶縁ケース１０８に覆われた状態で電池缶１０１内に収容されている。絶縁ケース１０８の材質は、ポリプロピレン等の絶縁性を有する樹脂である。これにより、電池缶１０１と、発電要素１７０とは電気的に絶縁されている。   As shown in FIG. 2, the power generation element 170 is accommodated in the battery can 101. The battery can 101 has a pair of wide surfaces 101a, a pair of narrow surfaces 101b, and a bottom surface 101c, and is formed in a rectangular box shape with an upper surface opened. The power generation element 170 is accommodated in the battery can 101 while being covered with the insulating case 108. The material of the insulating case 108 is an insulating resin such as polypropylene. Thereby, the battery can 101 and the power generation element 170 are electrically insulated.

正極端子１４１が正極集電体１８０を介して発電要素１７０の正極電極１７４に電気的に接続され、負極端子１５１が負極集電体１９０を介して発電要素１７０の負極電極１７５に電気的に接続されている。これにより、正極端子１４１および負極端子１５１を介して外部負荷に電力が供給され、あるいは、正極端子１４１および負極端子１５１を介して外部発電電力が発電要素１７０に供給されて充電される。   The positive terminal 141 is electrically connected to the positive electrode 174 of the power generation element 170 via the positive current collector 180, and the negative terminal 151 is electrically connected to the negative electrode 175 of the power generation element 170 via the negative current collector 190. Has been. Thereby, electric power is supplied to the external load via the positive electrode terminal 141 and the negative electrode terminal 151, or external generated electric power is supplied to the power generation element 170 via the positive electrode terminal 141 and the negative electrode terminal 151 to be charged.

電池蓋組立体１０７は、電池蓋１０２と、電池蓋１０２に設けられた一対の貫通孔１０２ｈのそれぞれに取り付けられた正極端子１４１および負極端子１５１と、正極集電体１８０および負極集電体１９０と、一対のガスケット１５０と、一対の絶縁部材１６０とを含んで構成されている。   The battery lid assembly 107 includes a battery lid 102, a positive electrode terminal 141 and a negative electrode terminal 151 attached to each of a pair of through holes 102 h provided in the battery lid 102, a positive electrode current collector 180, and a negative electrode current collector 190. And a pair of gaskets 150 and a pair of insulating members 160.

正極端子１４１および正極集電体１８０の材質はアルミニウム合金である。負極端子１５１および負極集電体１９０の材質は銅合金である。絶縁部材１６０およびガスケット１５０の材質は、ポリブチレンテレフタレートやポリフェニレンサルファイド、ペルフルオロアルコキシフッ素樹脂等の絶縁性を有する樹脂である。   The material of the positive electrode terminal 141 and the positive electrode current collector 180 is an aluminum alloy. The material of the negative electrode terminal 151 and the negative electrode current collector 190 is a copper alloy. The material of the insulating member 160 and the gasket 150 is an insulating resin such as polybutylene terephthalate, polyphenylene sulfide, or perfluoroalkoxy fluororesin.

［発電要素］
図３を参照して、発電要素１７０について説明する。図３は、図２に図示された発電要素を、その捲回終端部側を展開した状態の斜視図である。
蓄電要素である発電要素１７０は、図３に示すように、長尺状の正極電極１７４および負極電極１７５を、セパレータ１７３を介在させて捲回軸Ｗの周りに扁平形状に捲回することで積層構造とされている。すなわち、発電要素１７０は、捲回方向の両端部に断面が半円弧形状の円弧部が形成され、両端部間がほぼ平坦な平坦部を有する扁平形状の電極捲回群である。[Power generation element]
The power generating element 170 will be described with reference to FIG. FIG. 3 is a perspective view of the power generation element shown in FIG. 2 in a state where the winding end portion side is developed.
As shown in FIG. 3, the power generation element 170, which is a power storage element, winds a long positive electrode 174 and a negative electrode 175 in a flat shape around the winding axis W with a separator 173 interposed therebetween. It is a laminated structure. In other words, the power generating element 170 is a flat electrode winding group in which arc portions having a semicircular cross section are formed at both ends in the winding direction, and a flat portion between the both ends is substantially flat.

正極電極１７４は、正極箔１７１と、正極活物質に結着材（バインダ）を配合した正極活物質合剤が正極箔１７１の両面に塗工されて形成された正極活物質合剤層１７６とを有する。負極電極１７５は、負極箔１７２と、負極活物質に結着材（バインダ）を配合した負極活物質合剤が負極箔１７２の両面に塗工されて形成された負極活物質合剤層１７７とを有する。   The positive electrode 174 includes a positive electrode foil 171 and a positive electrode active material mixture layer 176 formed by coating a positive electrode active material mixture in which a binder (binder) is mixed with a positive electrode active material on both surfaces of the positive electrode foil 171. Have The negative electrode 175 includes a negative electrode foil 172 and a negative electrode active material mixture layer 177 formed by coating a negative electrode active material mixture in which a binder (binder) is mixed with a negative electrode active material on both surfaces of the negative electrode foil 172. Have

正極箔１７１は、厚さ２０〜３０μｍ程度のアルミニウム合金箔であり、負極箔１７２は、厚さ１５〜２０μｍ程度の銅合金箔である。セパレータ１７３の素材は多孔質のポリエチレン樹脂である。正極活物質は、マンガン酸リチウム等のリチウム含有遷移金属複酸化物であり、負極活物質は、リチウムイオンを可逆に吸蔵、放出可能な黒鉛等の炭素材である。   The positive foil 171 is an aluminum alloy foil having a thickness of about 20 to 30 μm, and the negative foil 172 is a copper alloy foil having a thickness of about 15 to 20 μm. The material of the separator 173 is a porous polyethylene resin. The positive electrode active material is a lithium-containing transition metal double oxide such as lithium manganate, and the negative electrode active material is a carbon material such as graphite capable of reversibly occluding and releasing lithium ions.

発電要素１７０の幅方向（捲回方向に直交する捲回軸Ｗ方向）の両端部は、一方は正極活物質合剤層１７６が形成されていない未塗工部（正極箔１７１の露出部）が積層された部分とされている。また、他方は負極活物質合剤層１７７が形成されていない未塗工部（負極箔１７２の露出部）が積層された部分とされている。正極側未塗工部の積層体および負極側未塗工部の積層体は、それぞれ予め押し潰され、それぞれ、電池蓋組立体１０７の正極集電体１８０および負極集電体１９０（図２参照）と超音波接合により接続され、電池蓋組立体１０７に一体化される。   One end of the power generation element 170 in the width direction (winding axis W direction orthogonal to the winding direction) is an uncoated portion where the positive electrode active material mixture layer 176 is not formed (exposed portion of the positive electrode foil 171). Are the stacked portions. The other is a portion where an uncoated portion (exposed portion of the negative electrode foil 172) where the negative electrode active material mixture layer 177 is not formed is laminated. The laminated body of the positive electrode side uncoated part and the laminated body of the negative electrode side uncoated part are crushed in advance, respectively, and the positive electrode current collector 180 and the negative electrode current collector 190 (see FIG. 2) of the battery lid assembly 107, respectively. ) By ultrasonic bonding and integrated with the battery lid assembly 107.

発電要素１７０は、電池蓋組立体１０７に一体化された状態で、電池缶１０１内に収容された絶縁ケース１０８内に収容される。発電要素１７０は、捲回軸Ｗが電池缶１０１の底面１０１ｃに平行にされ、かつ、一対の平坦部を電池缶１０１の幅広面１０１ａに平行にされて電池缶１０１内に収容される。この状態で、電池蓋組立体１０７の電池蓋１０２は、電池缶１０１の開口部を閉塞する。   The power generation element 170 is housed in the insulating case 108 housed in the battery can 101 in a state of being integrated with the battery lid assembly 107. The power generation element 170 is accommodated in the battery can 101 with the winding axis W parallel to the bottom surface 101 c of the battery can 101 and a pair of flat portions parallel to the wide surface 101 a of the battery can 101. In this state, the battery cover 102 of the battery cover assembly 107 closes the opening of the battery can 101.

閉塞した電池蓋１０２の周縁部が、レーザ溶接等により電池缶１０１の開口部の周縁部に接合される。そして、注液口１１０から非水電解液が注入される。非水電解液としては、たとえば、エチレンカーボネート等の炭酸エステル系の有機溶媒に６フッ化リン酸リチウム（ＬｉＰＦ6）等のリチウム塩が溶解された非水電解液を用いることができる。注液口１１０から電池缶１０１内に非水電解液を注入した後、封止栓１２０により注液口１１０が封止される。
次に、封止栓１２０による注液口１１０の封止構造について説明する。The peripheral edge of the closed battery lid 102 is joined to the peripheral edge of the opening of the battery can 101 by laser welding or the like. Then, a nonaqueous electrolytic solution is injected from the liquid injection port 110. As the non-aqueous electrolyte solution, for example, a non-aqueous electrolyte solution in which a lithium salt such as lithium hexafluorophosphate (LiPF 6 ) is dissolved in a carbonate ester-based organic solvent such as ethylene carbonate can be used. After injecting the nonaqueous electrolyte into the battery can 101 from the liquid injection port 110, the liquid injection port 110 is sealed by the sealing plug 120.
Next, the sealing structure of the liquid injection port 110 by the sealing plug 120 will be described.

［注液孔の封止構造］
図４は、注液孔の封止構造の拡大分解斜視図であり、図５は、図４を側方から観た電池蓋の断面図である。
注液口１１０は、電池蓋１０２の厚さ方向に貫通して形成された注液孔１１１と、注液孔１１１の外周に形成された凹部１１２とを有する。注液孔１１１と凹部１１２とは同心円に形成され、凹部１１２は、電池蓋１０２の上面（電池容器１０３の外部）側に設けられている。凹部１１２は、例えば、座ぐり加工により形成される。
注液孔１１１を封止する封止構造は、封止栓１２０とシール部材１３０によって構成される。[Injection hole sealing structure]
FIG. 4 is an enlarged exploded perspective view of the injection hole sealing structure, and FIG. 5 is a cross-sectional view of the battery lid when FIG. 4 is viewed from the side.
The liquid injection port 110 has a liquid injection hole 111 formed so as to penetrate in the thickness direction of the battery lid 102, and a recess 112 formed on the outer periphery of the liquid injection hole 111. The liquid injection hole 111 and the recess 112 are formed concentrically, and the recess 112 is provided on the upper surface side of the battery lid 102 (outside of the battery container 103). The recess 112 is formed by, for example, spot facing.
The sealing structure for sealing the liquid injection hole 111 is constituted by a sealing plug 120 and a sealing member 130.

封止栓１２０は、例えば、アルミニウム、アルミニウム合金等のアルミニウム系金属により形成され、底部１２１ａを有する円筒型の筒部（嵌入部）１２１と、筒部１２１の上部周縁部に形成された鍔部１２２とを有する。封止栓１２０の筒部１２１と鍔部１２２の中央部には中空部１２５が形成されている。つまり、封止栓１２０は、筒部１２１と鍔部１２２を有し、鍔部１２２側が開口された中空部１２５を有するほぼハット型形状に形成されている。   The sealing plug 120 is formed of, for example, an aluminum-based metal such as aluminum or an aluminum alloy, and has a cylindrical tube portion (insertion portion) 121 having a bottom portion 121 a and a flange portion formed on the upper peripheral portion of the tube portion 121. 122. A hollow portion 125 is formed in the center portion of the cylindrical portion 121 and the flange portion 122 of the sealing plug 120. That is, the sealing plug 120 has a cylindrical portion 121 and a flange portion 122, and is formed in a substantially hat shape having a hollow portion 125 having an opening on the flange portion 122 side.

シール部材１３０は、底部１３１ａを有する円筒形の筒状部１３１と、筒状部１３１の上部周縁部に設けられた鍔状部１３２とを有する。シール部材１３０の筒状部１３１と鍔状部１３２の中央部には中空部１３５が形成されている。つまり、シール部材１３０は、筒状部１３１と鍔状部１３２を有し、鍔状部１３２側が開口された中空部１３５を有するほぼハット型形状に形成されている。
シール部材１３０は、例えば、ポリプロピレン、ポリエチレン、ポリエチレンテレフタレート、ポリフェニルサルファイド等の弾性を有し、耐薬品性を有する樹脂、あるいはフッ素ゴム、ＥＰＤＭ等のゴムを用いて形成される。シール部材１３０は、例えば、厚さ０．０３〜０．５ｍｍ程度の薄肉に形成されている。The seal member 130 includes a cylindrical tubular portion 131 having a bottom portion 131 a and a flange-shaped portion 132 provided on the upper peripheral portion of the tubular portion 131. A hollow portion 135 is formed in the central portion of the cylindrical portion 131 and the flange-shaped portion 132 of the seal member 130. That is, the seal member 130 has a cylindrical portion 131 and a hook-shaped portion 132, and is formed in a substantially hat shape having a hollow portion 135 having an opening on the hook-shaped portion 132 side.
The seal member 130 is formed using, for example, a resin having elasticity and chemical resistance such as polypropylene, polyethylene, polyethylene terephthalate, and polyphenyl sulfide, or rubber such as fluorine rubber and EPDM. The seal member 130 is formed to be thin with a thickness of about 0.03 to 0.5 mm, for example.

図６は、注液孔の封止方法を説明するための断面図であり、図７は、封止栓による注液孔の封止が完了した状態の断面図である。
図７に図示されるように、注液孔１１１内にシール部材１３０の筒状部１３１が挿通され、シール部材１３０の鍔状部１３２が、凹部１１２に載置されている。
シール部材１３０の中空部１３５内に封止栓１２０の筒部１２１が嵌入され、封止栓１２０の鍔部１２２が、シール部材１３０の鍔状部１３２上に載置されている。シール部材１３０の鍔状部１３２の外径ｄ7は、封止栓１２０の鍔部１２２の外径ｄ6より小さく形成されている。また、シール部材１３０の底部１３１ａと封止栓１２０の底部１２１ａとの間には隙間Ｓが形成されている。FIG. 6 is a cross-sectional view for explaining a method for sealing a liquid injection hole, and FIG. 7 is a cross-sectional view in a state in which the liquid injection hole is sealed with a sealing plug.
As shown in FIG. 7, the tubular portion 131 of the seal member 130 is inserted into the liquid injection hole 111, and the flange portion 132 of the seal member 130 is placed in the recess 112.
The cylindrical portion 121 of the sealing plug 120 is fitted into the hollow portion 135 of the sealing member 130, and the flange portion 122 of the sealing plug 120 is placed on the flange-shaped portion 132 of the sealing member 130. The outer diameter d 7 of the flange 132 of the sealing member 130 is smaller than the outer diameter d 6 of the flange 122 of the sealing plug 120. A gap S is formed between the bottom 131 a of the seal member 130 and the bottom 121 a of the sealing plug 120.

図５に図示されるように、注液孔１１１の直径をｄ1、シール部材１３０の筒状部１３１の外径をｄ2、同内径をｄ3、封止栓１２０の筒部１２１の外径をｄ4とした場合、注液孔１１１の封止構造は次の条件が満たされるように構成されている。
条件１．ｄ2＜ｄ1
条件２．ｄ3＜ｄ4
条件３．（ｄ1−ｄ4）＜（ｄ2−ｄ3）As shown in FIG. 5, the diameter of the liquid injection hole 111 is d 1 , the outer diameter of the cylindrical portion 131 of the seal member 130 is d 2 , the inner diameter is d 3 , and the outer diameter of the cylindrical portion 121 of the sealing plug 120 is outside. When the diameter is d 4 , the sealing structure of the liquid injection hole 111 is configured to satisfy the following conditions.
Condition 1. d 2 <d 1
Condition 2. d 3 <d 4
Condition 3. (D 1 -d 4 ) <(d 2 -d 3 )

条件１により、シール部材１３０の筒状部１３１は注液孔１１１に遊嵌する。つまり、シール部材１３０の筒状部１３１と注液孔１１１との間にはギャップがあり、シール部材１３０の筒状部１３１を、注液孔１１１の周縁部側面に擦ることなく注液孔１１１内に挿通することができる。   Under the condition 1, the cylindrical portion 131 of the seal member 130 is loosely fitted into the liquid injection hole 111. That is, there is a gap between the cylindrical portion 131 of the sealing member 130 and the liquid injection hole 111, and the liquid injection hole 111 is rubbed without rubbing the cylindrical portion 131 of the sealing member 130 against the side surface of the peripheral portion of the liquid injection hole 111. Can be inserted inside.

条件２により、封止栓１２０の筒部１２１をシール部材１３０の中空部１３５内に嵌入すると、シール部材１３０の筒状部１３１は、封止栓１２０の筒部１２１により径大となるように拡張される。
また、（ｄ2−ｄ3）＊１/２は、シール部材１３０の筒状部１３１の厚さｔであり、（ｄ1−ｄ4）は、注液孔１１１と封止栓１２０の筒部１２１とのギャップである。従って、条件３は、封止栓１２０の筒部１２１がシール部材１３０の中空部１２５内に嵌入された状態では、封止栓１２０の筒部１２１によりシール部材１３０の筒状部１３１が注液孔１１１の周縁部側面に押圧され、圧縮された状態となっている。
このような状態で、封止栓１２０の鍔部１２２の外周が、電池蓋１０２の凹部１１２の周縁部に接合されている。When the cylindrical portion 121 of the sealing plug 120 is fitted into the hollow portion 135 of the sealing member 130 according to the condition 2, the cylindrical portion 131 of the sealing member 130 becomes larger in diameter than the cylindrical portion 121 of the sealing plug 120. Expanded.
Further, (d 2 -d 3 ) * 1/2 is the thickness t of the cylindrical portion 131 of the seal member 130, and (d 1 -d 4 ) is the cylinder of the liquid injection hole 111 and the sealing plug 120. This is a gap with the part 121. Therefore, Condition 3 is that the cylindrical portion 131 of the sealing member 120 is injected by the cylindrical portion 121 of the sealing plug 120 in a state where the cylindrical portion 121 of the sealing plug 120 is fitted in the hollow portion 125 of the sealing member 130. The hole 111 is pressed against the side surface of the peripheral portion and is compressed.
In such a state, the outer periphery of the flange 122 of the sealing plug 120 is joined to the peripheral edge of the recess 112 of the battery lid 102.

［注液孔の封止方法］
次に、注液孔１１１の封止方法を説明する。
電池缶１０１内に絶縁ケース１０８を収容し、絶縁ケース１０８内に発電要素１７０が一体化された電池蓋組立体１０７を収容する。電池蓋組立体１０７は、電池蓋１０２が電池缶１０１の開口部を塞ぐように位置決めし、レーザ溶接等により、電池蓋１０２の周縁部を電池缶１０１に接合する。そして、注液孔１１１から電池缶１０１内に電解液を所定量注入する。
そして、注液孔１１１を封止する。この封止の手順は以下の通りである。[Method of sealing the injection hole]
Next, a method for sealing the liquid injection hole 111 will be described.
The insulating case 108 is accommodated in the battery can 101, and the battery lid assembly 107 in which the power generation element 170 is integrated is accommodated in the insulating case 108. The battery lid assembly 107 is positioned so that the battery lid 102 closes the opening of the battery can 101, and the peripheral portion of the battery lid 102 is joined to the battery can 101 by laser welding or the like. Then, a predetermined amount of electrolyte is injected into the battery can 101 from the liquid injection hole 111.
Then, the liquid injection hole 111 is sealed. The sealing procedure is as follows.

先ず、注液孔１１１内にシール部材１３０を挿入する。このとき、条件１が満たされているので、シール部材１３０の筒状部１３１を注液孔１１１の周縁部側面に擦ることなく注液孔１１１内に挿通することができる。このため、この工程において、電池蓋１０２の材料であるアルミニウム系金属等の金属粒子が、電池蓋１０２の注液孔１１１の周縁部側面から剥落することはない。シール部材１３０は、その筒状部１３１が電池蓋１０２の凹部１１２の底部に当接した状態で電池蓋１０２に保持される。   First, the seal member 130 is inserted into the liquid injection hole 111. At this time, since the condition 1 is satisfied, the cylindrical portion 131 of the seal member 130 can be inserted into the liquid injection hole 111 without rubbing against the side surface of the peripheral edge of the liquid injection hole 111. For this reason, in this step, metal particles such as an aluminum-based metal that is a material of the battery lid 102 are not peeled off from the peripheral side surface of the liquid injection hole 111 of the battery lid 102. The seal member 130 is held by the battery lid 102 in a state where the cylindrical portion 131 is in contact with the bottom of the recess 112 of the battery lid 102.

次に、治具６０を用いて、シール部材１３０の中空部１３５内に、封止栓１２０を嵌入する。
図６に図示されるように、治具６０は、先端側に傾斜部６１を有する円錐台状の先端部を備え、全体がほぼ円柱形状を有する。治具６０の先端部６２の直径ｄj1は封止栓１２０の中空部１２５の直径、換言すれば、筒部１２１の内径ｄ5より小さく形成され、治具６０の直径ｄj2は中空部１２５の直径ｄ5より大きく形成されている。
従って、この治具６０の先端部６２側を封止栓１２０の中空部１２５内に挿入すると、治具６０の傾斜部６１の所定の位置における全周が、封止栓１２０の鍔部１２２の内面と筒部１２１の内面とが交差する稜部１２３に当接する。Next, the sealing plug 120 is inserted into the hollow portion 135 of the seal member 130 using the jig 60.
As illustrated in FIG. 6, the jig 60 includes a truncated cone-shaped distal end portion having an inclined portion 61 on the distal end side, and has a substantially cylindrical shape as a whole. The diameter d j1 of the distal end portion 62 of the jig 60 is formed smaller than the diameter of the hollow portion 125 of the sealing plug 120, in other words, the inner diameter d 5 of the cylindrical portion 121, and the diameter d j2 of the jig 60 is the hollow portion 125. of which is larger than the diameter d 5.
Therefore, when the tip end 62 side of the jig 60 is inserted into the hollow portion 125 of the sealing plug 120, the entire circumference of the inclined portion 61 of the jig 60 at a predetermined position of the flange portion 122 of the sealing plug 120. The inner surface and the inner surface of the cylindrical portion 121 are in contact with the ridge portion 123 where the inner surface intersects.

治具６０を押し込むことにより、封止栓１２０をシール部材１３０の中空部１３５内に圧入する。圧入は、封止栓１２０の鍔部１２２が、シール部材１３０の鍔状部１３２に当接するまで行う。
条件２が満たされているので、封止栓１２０の筒部１２１がシール部材１３０の中空部１３５内に嵌入された状態では、シール部材１３０の筒状部１３１は、封止栓１２０の筒部１２１により拡張される。また、条件３が満たされているので、シール部材１３０の筒状部１３１は、封止栓１２０の筒部１２１により注液孔１１１の周縁部側面に押圧され、圧縮された状態となっている。このため、封止栓１２０は、シール部材１３０の弾性力により仮固定されている。By pushing the jig 60, the sealing plug 120 is press-fitted into the hollow portion 135 of the seal member 130. The press-fitting is performed until the flange 122 of the sealing plug 120 contacts the flange 132 of the seal member 130.
Since the condition 2 is satisfied, the cylindrical portion 131 of the sealing member 120 is the cylindrical portion of the sealing plug 120 in a state where the cylindrical portion 121 of the sealing plug 120 is fitted in the hollow portion 135 of the sealing member 130. 121. In addition, since the condition 3 is satisfied, the cylindrical portion 131 of the seal member 130 is pressed against the peripheral side surface of the liquid injection hole 111 by the cylindrical portion 121 of the sealing plug 120 and is in a compressed state. . For this reason, the sealing plug 120 is temporarily fixed by the elastic force of the seal member 130.

この状態で、治具６０を上昇させ、封止栓１２０を電池蓋１０２に接合する。
溶接による接合方法の一例としてレーザ溶接の場合で例示すると、図７に図示された状態で、レーザビームを封止栓１２０の鍔部１２２の外周縁に照射する。照射位置は、鍔部１２２の外周面の僅か内側、例えば、０．０５〜０．２ｍｍ程度、内側の領域とする。また、ビームの照射角度は、垂直から僅かに時計方向（図７において）に傾斜した角度、５〜２０°程度とする。In this state, the jig 60 is raised and the sealing plug 120 is joined to the battery lid 102.
In the case of laser welding as an example of a joining method by welding, the laser beam is irradiated to the outer peripheral edge of the flange 122 of the sealing plug 120 in the state illustrated in FIG. The irradiation position is a region slightly inside the outer peripheral surface of the flange 122, for example, about 0.05 to 0.2 mm. Further, the beam irradiation angle is set to an angle slightly tilted clockwise from the vertical direction (in FIG. 7), about 5 to 20 °.

上述した通り、シール部材１３０の鍔状部１３２の外径ｄ7は、封止栓１２０の鍔部１２２の外径ｄ6より小さく形成されている。つまり、シール部材１３０の鍔状部１３２の外周は、凹部１１２の外周側面に対し、封止栓１２０の鍔部１２２の外周側面よりも、凹部１１２の内方に引込んでいる。このため、封止栓１２０の鍔部１２２の外周部を、電池蓋１０２における凹部１１２の周縁部にレーザ溶接する際、溶接時の熱により、シール部材１３０が変形したり、溶融したりするのを防止することができる。As described above, the outer diameter d 7 of the flange portion 132 of the seal member 130 is formed smaller than the outer diameter d 6 of the flange portion 122 of the sealing plug 120. That is, the outer periphery of the flange portion 132 of the seal member 130 is drawn inward of the recess 112 with respect to the outer peripheral side surface of the recess 112 rather than the outer peripheral side surface of the flange portion 122 of the sealing plug 120. Therefore, when the outer peripheral portion of the flange portion 122 of the sealing plug 120 is laser welded to the peripheral portion of the concave portion 112 in the battery lid 102, the seal member 130 is deformed or melted by heat during welding. Can be prevented.

封止栓１２０の鍔部１２２の上面は、電池蓋１０２の上面より僅かに突出しており、レーザビームの照射により、鍔部１２２の外周縁が溶融して周囲に流れ、封止栓１２０の周囲における電池蓋１０２の上層を溶融し、固化されて接合される。
上述した通り、封止栓１２０が電池蓋１０２に接合された状態では、シール部材１３０の底部１３１ａと封止栓１２０の底部１２１ａとの間には隙間Ｓが形成される。このため、封止栓１２０の筒部１２１をシール部材１３０の中空部１３５に圧入する際、封止栓１２０における筒部１２１から、封止栓１２０を構成する金属材料が粒子として剥落したとしても、シール部材１３０の底部１３１ａと封止栓１２０の底部１２１ａとの隙間Ｓ内に保留することができる。The upper surface of the flange portion 122 of the sealing plug 120 slightly protrudes from the upper surface of the battery lid 102, and the outer peripheral edge of the flange portion 122 melts and flows to the periphery by irradiation with the laser beam. The upper layer of the battery lid 102 is melted, solidified and joined.
As described above, when the sealing plug 120 is joined to the battery lid 102, a gap S is formed between the bottom 131a of the sealing member 130 and the bottom 121a of the sealing plug 120. For this reason, even if the metal material constituting the sealing plug 120 is peeled off as particles from the cylindrical portion 121 of the sealing plug 120 when the cylindrical portion 121 of the sealing plug 120 is press-fitted into the hollow portion 135 of the sealing member 130. In addition, it can be retained in the gap S between the bottom 131a of the sealing member 130 and the bottom 121a of the sealing plug 120.

（封止方法の変形例）
図８は、注液孔の封止方法の変形例を説明するための図であり、図８（ａ）は圧入用の治具の側面図、図８（ｂ）は注液口に封止栓を挿入した状態の断面図である。また、図９は、図８（ｂ）図示された封止構造の平面図である。
上述した注液孔の封止方法では、円錐台状の先端部を有する治具６０を用い、治具６０の傾斜部６１の所定の位置における全周を封止栓１２０の稜部１２３に当接させて、封止栓１２０をシール部材１３０の中空部１３５内に圧入するものであった。
これに対し、変形例では、治具６０Ａに複数の張出部６３を設け、この張出部６３を封止栓１２０に当接させて、封止栓１２０をシール部材１３０の中空部１３５内に圧入する方法である。(Modification of sealing method)
FIG. 8 is a view for explaining a modification of the method for sealing the injection hole, FIG. 8 (a) is a side view of a press-fitting jig, and FIG. 8 (b) is sealed at the injection port. It is sectional drawing of the state which inserted the stopper. FIG. 9 is a plan view of the sealing structure shown in FIG.
In the injection hole sealing method described above, the jig 60 having a truncated cone-shaped tip is used, and the entire circumference of the inclined portion 61 of the jig 60 at a predetermined position is applied to the ridge 123 of the sealing plug 120. The sealing plug 120 is press-fitted into the hollow portion 135 of the sealing member 130 in contact therewith.
On the other hand, in the modification, a plurality of overhang portions 63 are provided on the jig 60 </ b> A, the overhang portions 63 are brought into contact with the sealing plug 120, and the sealing plug 120 is placed inside the hollow portion 135 of the seal member 130. It is a method of press-fitting into.

図８（ａ）に図示されるように、治具６０Ａは、先端部６２側に、一対の張出部６３を有する。張出部６３は、円周方向において所定の幅を有する。
張出部６３の端部は、治具６０Ａの先端部６２側が径小となる方向に傾斜する傾斜部６４とされている。傾斜部６４の内側の直径ｄj1は封止栓１２０の中空部１２５の直径ｄ5より小さく形成され、傾斜部６４の外側の直径ｄj2は中空部１２５の直径ｄ5より大きく形成されている。この寸法関係は、実施形態１の場合と同様である。As illustrated in FIG. 8A, the jig 60 </ b> A has a pair of overhang portions 63 on the tip end portion 62 side. The overhang portion 63 has a predetermined width in the circumferential direction.
The end portion of the overhang portion 63 is an inclined portion 64 that is inclined in a direction in which the tip end 62 side of the jig 60A has a smaller diameter. The inner diameter d j1 of the inclined portion 64 is formed smaller than the diameter d 5 of the hollow portion 125 of the sealing plug 120, and the outer diameter d j2 of the inclined portion 64 is formed larger than the diameter d 5 of the hollow portion 125. . This dimensional relationship is the same as in the first embodiment.

従って、治具６０Ａの張出部６３の先端部６２側を封止栓１２０の中空部１２５内に挿入すると、治具６０Ａの張出部６３の傾斜部６４が、封止栓１２０の稜部１２３に当接する。
そこで、治具６０Ａを押し込むことにより、封止栓１２０の筒部１２１をシール部材１３０の中空部１３５内に圧入することができる。
なお、図９には、治具６０Ａの張出部６３の傾斜部６４が当接する封止栓１２０の稜部１２３の部分１２３ａが示されている。
なお、治具６０Ａに形成する張出部６３の数は、３箇所以上、適宜の数を設けるようにすることができる。Therefore, when the distal end 62 side of the overhanging portion 63 of the jig 60A is inserted into the hollow portion 125 of the sealing plug 120, the inclined portion 64 of the overhanging portion 63 of the jig 60A becomes the ridge portion of the sealing plug 120. 123 abuts.
Therefore, the cylindrical portion 121 of the sealing plug 120 can be press-fitted into the hollow portion 135 of the sealing member 130 by pushing the jig 60 </ b> A.
9 shows a portion 123a of the ridge portion 123 of the sealing plug 120 with which the inclined portion 64 of the overhang portion 63 of the jig 60A abuts.
In addition, the number of the overhang | projection parts 63 formed in the jig | tool 60A can be made to provide an appropriate number of three or more places.

--実施形態２--
図１０は、本発明の実施形態２を示す注液孔の封止構造の断面図である。
実施形態２における注液孔の封止構造が実施形態１と相違する点は、シール部材１３０Ａが底部を有していない点である。
すなわち、シール部材１３０Ａは、鍔状部１３２と無底の筒状部１３１Ａとにより構成されている。筒状部１３１Ａの高さは、電池蓋１０２の注液孔１１１の深さより小さく、筒状部１３１Ａの下端面１３１ｂは、電池蓋１０２の下面１０２ａから電池容器の外方側に向けて引込んでいる。これにより、シール部材１３０Ａの注液孔１１１への挿通が容易となり、かつ、部品コストが安価となる。但し、筒状部１３１Ａの高さを、電池蓋１０２の注液孔１１１の深さより大きくし、筒状部１３１Ａの下端面１３１ｂを、電池蓋１０２の下面１０２ａから電池容器の内部に突き出すようにしてもよい。
その他の構成は、実施形態１と同様である。--Embodiment 2--
FIG. 10 is a cross-sectional view of the injection hole sealing structure showing Embodiment 2 of the present invention.
The sealing structure of the liquid injection hole in the second embodiment is different from the first embodiment in that the seal member 130A does not have a bottom.
That is, the seal member 130A is configured by a flange-shaped portion 132 and a bottomless cylindrical portion 131A. The height of the cylindrical portion 131A is smaller than the depth of the liquid injection hole 111 of the battery lid 102, and the lower end surface 131b of the cylindrical portion 131A is drawn from the lower surface 102a of the battery lid 102 toward the outer side of the battery container. Yes. Thereby, it becomes easy to insert the seal member 130A into the liquid injection hole 111, and the component cost is reduced. However, the height of the cylindrical portion 131A is made larger than the depth of the liquid injection hole 111 of the battery lid 102 so that the lower end surface 131b of the cylindrical portion 131A protrudes from the lower surface 102a of the battery lid 102 into the battery container. May be.
Other configurations are the same as those of the first embodiment.

--実施形態３--
図１１は、本発明の実施形態３を示す注液孔の封止構造の断面図である。
実施形態３における注液孔の封止構造が実施形態２と相違する点は、封止栓１２０Ａが、中空部１２５を有していない点である。
すなわち、封止栓１２０Ａは、底部１２１ａを有する円柱状の嵌入部１２１Ａと、この嵌入部１２１Ａの上部側に一体に形成された円盤状の鍔部１２２Ａとにより構成されている。
この構造においても、シール部材１３０Ａの筒状部１３１Ａは、封止栓１２０Ａの嵌入部１２１Ａの外周面により注液孔１１１の周縁部側面に押圧され、圧縮された状態となっている。このため、封止栓１２０Ａを、シール部材１３０の弾性力により電池蓋１２０の仮固定された状態で、封止栓１２０Ａの鍔部１２２Ａの外周を、凹部１１２周縁の電池蓋１０２に溶接により接合することができる。
実施形態３のその他の構造は、実施形態２と同様であり、対応する部材に同一の符号を付して説明を省略する。--Embodiment 3--
FIG. 11 is a cross-sectional view of a liquid injection hole sealing structure showing Embodiment 3 of the present invention.
The sealing structure of the liquid injection hole in the third embodiment is different from that in the second embodiment in that the sealing plug 120A does not have the hollow portion 125.
That is, the sealing plug 120A includes a columnar insertion portion 121A having a bottom portion 121a and a disk-shaped flange portion 122A integrally formed on the upper side of the insertion portion 121A.
Also in this structure, the cylindrical portion 131A of the seal member 130A is pressed against the peripheral side surface of the liquid injection hole 111 by the outer peripheral surface of the fitting portion 121A of the sealing plug 120A and is in a compressed state. Therefore, the outer periphery of the flange 122A of the sealing plug 120A is joined to the battery lid 102 at the periphery of the recess 112 by welding in a state where the sealing cap 120A is temporarily fixed by the elastic force of the seal member 130. can do.
Other structures of the third embodiment are the same as those of the second embodiment, and corresponding members are denoted by the same reference numerals and description thereof is omitted.

以上説明した通り、上記実施形態によれば、下記の効果を奏する。
（１）注液孔１１１と封止栓１２０との間に、注液孔１１１の直径より小さい外径の筒状部１３１を有する弾性材料で形成されたシール部材１３０を介在させた。
このため、注液孔１１１にシール部材１３０を挿通する際、電池蓋１０２おける注液孔１１１の周縁部側面にシール部材１３０が擦れることがなく、電池蓋１０２を構成する金属材料が粒子として剥落し、電池容器内に落下することがない。また、シール部材１３０の中空部１３５内に封止栓１２０を圧入する際、シール部材１３０は弾性を有するので、封止栓１２０を構成する金属材料が粒子として脱落する可能性は、封止栓１２０を直接、封止孔１１１内に圧入する方法に比し、小さい。よって、注液孔１１１を封止する際、電池容器１０３内に金属粒子が脱落するのを防止することができる。As described above, according to the above embodiment, the following effects can be obtained.
(1) A seal member 130 made of an elastic material having a cylindrical portion 131 having an outer diameter smaller than the diameter of the liquid injection hole 111 is interposed between the liquid injection hole 111 and the sealing plug 120.
For this reason, when the sealing member 130 is inserted into the liquid injection hole 111, the sealing member 130 does not rub against the side surface of the peripheral edge of the liquid injection hole 111 in the battery lid 102, and the metal material constituting the battery lid 102 peels off as particles. However, it does not fall into the battery container. Further, when the sealing plug 120 is press-fitted into the hollow portion 135 of the sealing member 130, the sealing member 130 has elasticity. Therefore, the possibility that the metal material constituting the sealing plug 120 is dropped as particles is the sealing plug 130. Compared with the method in which 120 is directly press-fitted into the sealing hole 111, the size is small. Therefore, when sealing the liquid injection hole 111, it can prevent that a metal particle falls in the battery container 103. FIG.

（２）（封止栓１２０の筒部１２１の外径）ｄ4＞（シール部材１３０の筒状部１３１の内径）ｄ3とし、かつ、［（シール部材１３０の筒状部１３１の外径）ｄ2−（シール部材１３０の筒状部１３１の内径）ｄ3］＞［（注液孔１１１の直径）ｄ1−（封止栓１２０の筒部１２１の外径）ｄ4］とした。
これにより、封止栓１２０の筒部１２１がシール部材１３０の中空部１３５内に圧入された状態では、シール部材１３０の筒状部１３１は、封止栓１２０の筒部１２１により注液孔１１１の周縁部側面に押圧され、圧縮された状態となっている。このため、封止栓１２０は、シール部材１３０の弾性力により仮固定されている。従って、この状態で治具６０を上昇しても、封止栓１２０が浮き上がったり、ガタついたりすることが無いので、封止栓１２０の鍔部１２２の外周縁を電池蓋１０２の凹部１１２の周縁部にレーザ溶接する作業を効率的に行うことができる。また、シール部材１３０が、注液孔１１１の周縁部側面と封止栓１２０の筒部１２１との間で圧縮されているので、この間から電解液が浸透して外部に漏れ出るのを防ぐことができ、レーザ溶接の際の溶接不良を防止することができる。(2) (Outer diameter of cylindrical portion 121 of sealing plug 120) d 4 > (inner diameter of cylindrical portion 131 of sealing member 130) d 3 and [(outer diameter of cylindrical portion 131 of sealing member 130) ) D 2 − (inner diameter of the cylindrical portion 131 of the seal member 130) d 3 ]> [(diameter of the injection hole 111) d 1 − (outer diameter of the cylindrical portion 121 of the sealing plug 120) d 4 ] .
Thereby, in a state where the cylindrical portion 121 of the sealing plug 120 is press-fitted into the hollow portion 135 of the sealing member 130, the cylindrical portion 131 of the sealing member 130 is injected into the liquid injection hole 111 by the cylindrical portion 121 of the sealing plug 120. It is pressed and pressed into the peripheral edge side surface. For this reason, the sealing plug 120 is temporarily fixed by the elastic force of the seal member 130. Therefore, even if the jig 60 is raised in this state, the sealing plug 120 does not float or rattle, so the outer peripheral edge of the flange 122 of the sealing plug 120 is connected to the recess 112 of the battery lid 102. The operation of laser welding to the peripheral portion can be performed efficiently. Moreover, since the sealing member 130 is compressed between the peripheral side surface of the liquid injection hole 111 and the cylindrical portion 121 of the sealing plug 120, it prevents the electrolyte from penetrating and leaking outside. It is possible to prevent welding defects during laser welding.

（３）実施形態１においては、シール部材１３０に底部１３１ａを設け、封止栓１２０が電池蓋１０２に接合された状態で、シール部材１３０の底部１３１ａと封止栓１２０の底部１２１ａとの間に隙間Ｓが形成されるようにした。このため、封止栓１２０の筒部１２１をシール部材１３０の中空部１３５に圧入する際、封止栓１２０における筒部１２１から、封止栓１２０を構成する金属材料が粒子として剥落したとしても、この金属粒子を、シール部材１３０の底部１３１ａと封止栓１２０の底部１２１ａとの隙間Ｓ内に保留することができる。 (3) In the first embodiment, the bottom 131 a is provided on the sealing member 130, and the sealing plug 120 is joined to the battery lid 102, and the gap between the bottom 131 a of the sealing member 130 and the bottom 121 a of the sealing plug 120 is A gap S was formed on the surface. For this reason, even if the metal material constituting the sealing plug 120 is peeled off as particles from the cylindrical portion 121 of the sealing plug 120 when the cylindrical portion 121 of the sealing plug 120 is press-fitted into the hollow portion 135 of the sealing member 130. The metal particles can be retained in the gap S between the bottom 131a of the sealing member 130 and the bottom 121a of the sealing plug 120.

（４）シール部材１３０の鍔状部１３２の外径ｄ7を、封止栓１２０の鍔部１２２の外径ｄ6より小さくした。このため、封止栓１２０の鍔部１２２の外周部を、電池蓋１０２における凹部１１２の周縁部にレーザ溶接する際、溶接時の熱により、シール部材１３０が変形したり、溶融したりするのを防止することができる。(4) The outer diameter d 7 of the flange portion 132 of the seal member 130 is made smaller than the outer diameter d 6 of the flange portion 122 of the sealing plug 120. Therefore, when the outer peripheral portion of the flange portion 122 of the sealing plug 120 is laser welded to the peripheral portion of the concave portion 112 in the battery lid 102, the seal member 130 is deformed or melted by heat during welding. Can be prevented.

なお、上記実施形態において、封止栓１２０および電池蓋１０２をアルミニウム系金属により形成されているものとした。しかし、封止栓１２０や電池蓋１０２の材料は、アルミニウム系金属に限られるものではなく、一方又は他方を銅系金属、鉄、ＳＵＳ等の他の金属材料により形成する場合にも適用が可能である。   In the above embodiment, the sealing plug 120 and the battery lid 102 are made of an aluminum-based metal. However, the material of the sealing plug 120 and the battery lid 102 is not limited to the aluminum-based metal, and can be applied to the case where one or the other is formed of another metal material such as a copper-based metal, iron, or SUS. It is.

上記実施形態において、注液孔１１１の封止構造を、電池缶１０１に接合される電池蓋１０２に形成する構造として例示した。しかし、注液孔１１１の封止構造を電池缶１０１に一体的に成形された電池蓋部に形成したり、電池容器１０３の側部に形成したりしてもよい。   In the said embodiment, the sealing structure of the injection hole 111 was illustrated as a structure formed in the battery cover 102 joined to the battery can 101. FIG. However, the sealing structure of the liquid injection hole 111 may be formed on the battery lid part formed integrally with the battery can 101 or on the side part of the battery container 103.

上記実施形態では、封止栓１２０の筒部１２１、シール部材１３０の筒状部１３１および注液孔１１１を、平面視で円形として例示した。しかし、封止栓１２０の筒部１２１、シール部材１３０の筒状部１３１および注液孔１１１を、平面視で、楕円形、多角形等他の形状であっても適用することができる。   In the said embodiment, the cylindrical part 121 of the sealing plug 120, the cylindrical part 131 of the sealing member 130, and the liquid injection hole 111 were illustrated as circular by planar view. However, the cylindrical portion 121 of the sealing plug 120, the cylindrical portion 131 of the sealing member 130, and the liquid injection hole 111 can be applied even if they have other shapes such as an ellipse and a polygon in plan view.

上記実施形態では、注液口１１０は、注液孔１１１と、注液孔１１１の周縁部側面に形成された凹部１１２とを備える構造として例示したが、凹部１１２は必ずしも必要ではない。あるいは、凹部１１２の深さを、シール部材１３０の鍔状部１３２のみを収容する深さにして、封止栓１２０を電池蓋１０２の上面に載置するようにしてもよい。   In the said embodiment, although the liquid injection port 110 illustrated as a structure provided with the liquid injection hole 111 and the recessed part 112 formed in the peripheral part side surface of the liquid injection hole 111, the recessed part 112 is not necessarily required. Alternatively, the depth of the concave portion 112 may be set to a depth that accommodates only the hook-shaped portion 132 of the seal member 130, and the sealing plug 120 may be placed on the upper surface of the battery lid 102.

本発明は、リチウムイオン角形二次電池に限られるものではなく、ニッケル水素電池またはニッケル・カドミウム電池、鉛蓄電池のように水溶性電解液を用いる角形二次電池にも適用が可能である。また、本発明は、リチウムイオンキャパシタや電解二重層コンデンサ等にも適用が可能である。   The present invention is not limited to a lithium ion prismatic secondary battery, but can also be applied to a prismatic secondary battery using a water-soluble electrolyte solution, such as a nickel metal hydride battery, a nickel-cadmium battery, or a lead storage battery. The present invention can also be applied to lithium ion capacitors, electrolytic double layer capacitors, and the like.

その他、本発明の角形蓄電素子は、種々、変形して適用することが可能であり、要は、注液孔と封止栓との間に介在され、注液孔内に遊嵌される筒状部とを有するシール部材を備え、シール部材の挿通部が、封止栓の嵌入部の外周面により容器の注液孔の周縁部側面に押圧され、圧縮された状態で、封止栓の鍔部の外周が容器に接合されているものであればよい。   In addition, the rectangular electricity storage device of the present invention can be applied in various modifications. In short, a cylinder interposed between the liquid injection hole and the sealing plug and loosely fitted in the liquid injection hole. And the insertion portion of the sealing member is pressed against the peripheral side surface of the liquid injection hole by the outer peripheral surface of the insertion portion of the sealing plug and compressed, What is necessary is just that the outer periphery of a collar part is joined to the container.

Claims (8)

容器内に発電要素を収容し、前記容器の一側面に設けられた注液孔から前記容器内に電
解液を注入する第１の工程と、
前記注液孔内に、シール部材の筒状部を挿通する第２の工程と、
前記シール部材の前記筒状部内に、嵌入部を有する封止栓を圧入する第３の工程と、
前記シール部材の前記筒状部が、前記封止栓の前記嵌入部と前記容器の前記注液孔の周
縁部側面との間で圧縮された状態で、前記封止栓の鍔部の外周縁を前記容器に接合する第４の工程と、を備え、
前記第２の工程における、前記シール部材の前記筒状部の外径は前記注液孔の直径より小さく形成され、
前記第３の工程における、前記封止栓の前記嵌入部の外径は前記シール部材の前記筒状部の内径よりも大きく形成され、
前記第４の工程は、前記シール部材の前記筒状部を、前記封止栓の前記嵌入部により拡張して、前記シール部材の前記筒状部を、前記封止栓の前記嵌入部と前記容器の前記注液孔の周縁部側面との間に圧縮する工程を含み、
前記第１の工程から前記第４の工程を、上記の順に行う、角形蓄電素子の製造方法。 A first step of the power generating element housed in the container, the electrolyte solution is injected into the container from the injection hole provided on one side of the container,
A second step of inserting the cylindrical portion of the seal member into the liquid injection hole;
A third step of press-fitting a sealing plug having a fitting portion into the cylindrical portion of the seal member;
In the state where the cylindrical portion of the sealing member is compressed between the fitting portion of the sealing plug and the peripheral side surface of the liquid injection hole of the container, the outer peripheral edge of the flange portion of the sealing plug A fourth step of joining the container to the container ,
In the second step, the outer diameter of the cylindrical portion of the seal member is formed smaller than the diameter of the liquid injection hole,
In the third step, the outer diameter of the fitting portion of the sealing plug is formed larger than the inner diameter of the cylindrical portion of the seal member,
In the fourth step, the tubular portion of the sealing member is expanded by the fitting portion of the sealing plug, and the tubular portion of the sealing member is expanded with the fitting portion of the sealing plug. Compressing between the liquid injection hole and the peripheral side surface of the container,
The manufacturing method of the square electrical storage element which performs the said 4th process from the said 1st process in said order . 請求項１に記載の角形蓄電素子の製造方法において、前記注液孔の直径と前記封止栓の前記嵌入部の外径との差は、前記シール部材の前記筒状部の外径と前記シール部材の前
記筒状部の内径との差よりも小さい、角形蓄電素子の製造方法。 2. The method of manufacturing a rectangular electricity storage device according to claim 1 , wherein a difference between a diameter of the liquid injection hole and an outer diameter of the fitting portion of the sealing plug is an outer diameter of the cylindrical portion of the sealing member and the outer diameter of the sealing member. The manufacturing method of a square electrical storage element which is smaller than the difference with the internal diameter of the said cylindrical part of a sealing member. 請求項１に記載の角形蓄電素子の製造方法において、前記封止栓は、前記鍔部と前記嵌入部との中央部に連通して形成された中空部を有する、角形蓄電素子の製造方法。 The method of manufacturing a prismatic electric storage device according to claim 1, wherein the sealing member has a hollow portion formed in communication with the central portion between the insertion portion and the flange portion, the manufacturing method of the rectangular electric storage device. 請求項３に記載の角形蓄電素子の製造方法において、前記シール部材は、前記注液孔の周縁部に搭載される鍔状部を有する、角形蓄電素子の製造方法。The manufacturing method of the square electrical storage element of Claim 3 WHEREIN: The said sealing member has a collar-shaped part mounted in the peripheral part of the said liquid injection hole. 請求項４に記載の角形蓄電素子の製造方法において、前記シール部材は、前記筒状部における前記鍔状部と反対側に底部を有する、角形蓄電素子の製造方法。5. The method for manufacturing a rectangular electricity storage device according to claim 4, wherein the sealing member has a bottom portion on a side opposite to the flange-like portion in the cylindrical portion. 請求項５に記載の角形蓄電素子の製造方法において、前記封止栓の前記嵌入部の前記底部と前記シール部材の前記底部との間に隙間が設けられている、角形蓄電素子の製造方法。 The method of manufacturing a prismatic electric storage device according to claim 5, wherein the gap between said bottom portion and said bottom portion of said fitting portion of the sealing member the seal member is provided, the manufacturing method of the rectangular electric storage device. 請求項４に記載の角形蓄電素子の製造方法において、前記容器は、前記注液孔の周縁部に凹部を有し、前記シール部材の前記鍔状部は、前記凹部の底面上に配置されている、角形蓄電素子の製造方法。 5. The method for manufacturing a rectangular electricity storage device according to claim 4 , wherein the container has a recess in a peripheral portion of the liquid injection hole, and the hook-shaped portion of the seal member is disposed on a bottom surface of the recess. The manufacturing method of the square electrical storage element. 請求項４乃至７のいずれか１項に記載の角形蓄電素子の製造方法において、前記シール部材の前記鍔状部の外径は、前記封止栓の前記鍔部の外径より小さく形成されている、角形蓄電素子の製造方法。
8. The method for manufacturing a rectangular electricity storage device according to claim 4 , wherein an outer diameter of the flange portion of the seal member is smaller than an outer diameter of the flange portion of the sealing plug. The manufacturing method of the square electrical storage element.
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