JP5120867B2 - Sealed battery - Google Patents

Sealed battery Download PDF

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Publication number
JP5120867B2
JP5120867B2 JP2006150545A JP2006150545A JP5120867B2 JP 5120867 B2 JP5120867 B2 JP 5120867B2 JP 2006150545 A JP2006150545 A JP 2006150545A JP 2006150545 A JP2006150545 A JP 2006150545A JP 5120867 B2 JP5120867 B2 JP 5120867B2
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injection hole
liquid injection
sealing plug
vertical
battery
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JP2007323860A (en
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真由美 山本
義久 藤原
良樹 杣友
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Hitachi Maxell Energy Ltd
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Hitachi Maxell Energy Ltd
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Priority to JP2006150545A priority Critical patent/JP5120867B2/en
Priority to CN2007101048101A priority patent/CN101083310B/en
Priority to KR1020070050718A priority patent/KR101282911B1/en
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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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • 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 of a single cell or a single battery
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular cells
    • 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

Description

本発明は、リチウムイオン電池などの密閉型電池に関する。   The present invention relates to a sealed battery such as a lithium ion battery.

特許文献１・２には、電池缶の上面開口を蓋で塞いだ電池ケース内に電極体や電解液などを収容した密閉型電池が開示されている。この密閉型電池では、蓋に設けた注液孔から電池缶内に電解液を注入し、次いで前記注液孔に封止栓を嵌合させて封止栓の上端周縁部を注液孔の上端周縁部にレーザなどを用いてシーム溶接することで、注液孔を封止栓で密封状に封口している。   Patent Documents 1 and 2 disclose a sealed battery in which an electrode body, an electrolytic solution, and the like are accommodated in a battery case in which an upper surface opening of a battery can is closed with a lid. In this sealed battery, an electrolytic solution is injected into the battery can through a liquid injection hole provided in the lid, and then a sealing plug is fitted into the liquid injection hole so that the upper peripheral edge of the sealing plug is connected to the liquid injection hole. The liquid injection hole is sealed with a sealing plug by seam welding to the peripheral edge of the upper end using a laser or the like.

特開２０００−１０６１５６号公報（図５）Japanese Unexamined Patent Publication No. 2000-106156 (FIG. 5) 特開２００２−３５８９４８号公報（図１）JP 2002-358948 A (FIG. 1)

前記電解液の注入後にあっては、注液孔の上面の周縁付近などに電解液が若干残留することがある。この状態で停電などのトラブルによって製造が一時停止すると、前記残留した電解液の溶媒が蒸発して電解質が析出する。   After the injection of the electrolytic solution, the electrolytic solution may remain slightly in the vicinity of the periphery of the upper surface of the injection hole. In this state, when the production is temporarily stopped due to a trouble such as a power failure, the solvent of the remaining electrolytic solution evaporates and the electrolyte is deposited.

特許文献１では、封止栓で注液孔を封口する際に、封止栓の頭部（鍔）の下面が注液孔の周縁付近に押し当たる。その注液孔の周縁付近に電解液が残留していると、前述のごとく電解質が析出したときには、封止栓を注液孔に嵌合した際に封止栓の頭部の下面が前記析出した電解質に当たって、封止栓が斜めに傾いた状態で注液孔に挿入され、あるいは析出した電解質の厚さの分だけ、注液孔の周縁付近が封止栓の頭部で余分に押し下げられて蓋が変形する。   In Patent Document 1, when the liquid injection hole is sealed with the sealing plug, the lower surface of the head (鍔) of the sealing plug is pressed against the periphery of the liquid injection hole. If the electrolyte remains in the vicinity of the periphery of the liquid injection hole, when the electrolyte is deposited as described above, the bottom surface of the head of the sealing plug is deposited when the sealing plug is fitted into the liquid injection hole. The electrolyte plug is inserted into the injection hole with the sealing plug tilted obliquely, or the periphery of the injection hole is pushed down by the head of the sealing plug by the thickness of the deposited electrolyte. The lid is deformed.

これらの場合、封止栓の頭部の下面と注液孔の周縁部との間に隙間が生じてしまい、封止栓と注液孔との溶接部にピンホールなどが発生する。この結果、電池の密封性が保てなくなる。   In these cases, a gap is formed between the lower surface of the head portion of the sealing plug and the peripheral portion of the liquid injection hole, and a pinhole or the like is generated at the welded portion between the sealing plug and the liquid injection hole. As a result, the sealing performance of the battery cannot be maintained.

特許文献２では、注液孔の上部の内周面が下窄まりのテーパ面になっており、それに合わせて封止栓の頭部の側面が下窄まりのテーパ面になっている。そして、封止栓で注液孔を封口する際には、封止栓の頭部のテーパ面が、注液孔のテーパ面に沿って押し当たった状態で嵌合する（特許文献２の段落番号００１０参照）。前記注液孔のテーパ面には電解液が残留しないために、封止栓の頭部のテーパ面と注液孔のテーパ面との間に、前述の電解質の析出に起因する隙間が生じることがない。   In Patent Document 2, the inner peripheral surface of the upper part of the injection hole is a tapered surface with a constriction, and the side surface of the head portion of the sealing plug is a constricting tapered surface in accordance with this. And when sealing a liquid injection hole with a sealing stopper, the taper surface of the head part of a sealing stopper fits in the state pressed against the taper surface of a liquid injection hole (paragraph of patent document 2). No. 0010). Since no electrolyte remains on the tapered surface of the liquid injection hole, a gap due to the above-described electrolyte deposition occurs between the taper surface of the head of the sealing plug and the taper surface of the liquid injection hole. There is no.

ところが、特許文献２では、封止栓の頭部が下窄まりのテーパ状になっている分だけ封止栓の上端周縁部の厚さが小さくなっており、封止栓の上端周縁部と注液孔の上端周縁部との境に沿って溶接した際には、封止栓の上端周縁部の溶融が不十分になる（特許文献２の図１（Ｄ）参照）。   However, in Patent Document 2, the thickness of the upper peripheral edge of the sealing plug is reduced by the amount that the head of the sealing plug is tapered, and the upper peripheral edge of the sealing plug is When welding is performed along the boundary with the upper peripheral edge of the liquid injection hole, the upper peripheral edge of the sealing plug is not sufficiently melted (see FIG. 1D of Patent Document 2).

このため、封止栓の上端周縁部と注液孔の上端周縁部との溶接が不十分になって、注液孔の密封性が低下する。レーザでの照射時間を長くすると、封止栓の上端周縁部の溶融量が向上するが、溶接の熱が電池内に伝わってしまい、電極体の変形などを招くおそれがある。   For this reason, welding with the upper-end peripheral part of a sealing stopper and the upper-end peripheral part of a liquid injection hole becomes inadequate, and the sealing performance of a liquid injection hole falls. When the irradiation time with the laser is lengthened, the amount of melting at the peripheral edge of the upper end of the sealing plug is improved, but the heat of welding is transferred into the battery, which may cause deformation of the electrode body.

また、電池の製造ラインでは、パーツフィーダで封止栓の上下の向きを揃え、かつ封止栓を整列させた状態で製造ラインに供給することになる。この際、パーツフィーダでは、封止栓の頭部の下面側をガイドレールに載せて、封止栓を適正な姿勢に整列させることになるが、特許文献２では、封止栓の頭部の全体がテーパ状になっているために、前記ガイドレールに載せたときには封止栓が傾いた姿勢になる。この場合、製造ラインにおいて封止栓の供給エラーが生じるおそれがある。   Moreover, in the battery production line, the parts plugs are supplied to the production line with the top and bottom directions of the sealing plugs aligned and the sealing plugs aligned. At this time, in the parts feeder, the lower surface side of the head portion of the sealing plug is placed on the guide rail to align the sealing plug in an appropriate posture. Since the whole is tapered, the sealing plug is inclined when it is placed on the guide rail. In this case, there is a possibility that a supply error of the sealing plug may occur in the production line.

そこで本発明の目的は、電解液が注液孔に残留し難くして封止栓を注液孔に確実に封口できるうえ、封止栓と注液孔とを確実に溶接できる密閉型電池を提供することにある。   Accordingly, an object of the present invention is to provide a sealed battery in which the electrolytic solution is less likely to remain in the injection hole and the sealing plug can be reliably sealed to the injection hole and the sealing plug and the injection hole can be reliably welded. It is to provide.

本発明が対象とする密閉型電池は、図１に示すごとく、電池ケース６に設けた注液孔１６から電池ケース６内に電解液を注入したのちに、注液孔１６に封止栓１７を嵌合させて封止栓１７の上端周縁部を注液孔１６の上端周縁部に溶接することで、注液孔１６が封口されている。ここでは、電池ケース６の外面側を上、電池ケース６の内面側を下に定義した。   As shown in FIG. 1, the sealed battery targeted by the present invention injects electrolytic solution into the battery case 6 from the injection hole 16 provided in the battery case 6, and then seals the sealing plug 17 into the injection hole 16. And the upper peripheral edge of the sealing plug 17 is welded to the upper peripheral edge of the liquid injection hole 16 so that the liquid injection hole 16 is sealed. Here, the outer surface side of the battery case 6 is defined as the upper side, and the inner surface side of the battery case 6 is defined as the lower side.

本発明は、図１および図３に示すごとく、封止栓１７が、注液孔１６の上端周縁部に溶接される頭部２２と、その頭部２２の下面２２ｃの中央から下向きに延出する軸部２３とを有しており、封止栓１７の頭部２２の下面２２ｃは、封止栓１７の上下方向に対してほぼ垂直になっており、注液孔１６は、封止栓１７の頭部２２が嵌合する嵌合凹部２６と、封止栓１７の軸部２３が嵌入する嵌入部２７とを有しており、注液孔１６の嵌合凹部２６の内周面は、電池ケース６の外表面であって注液孔１６の周縁を形成する面に対してほぼ垂直方向に延びる垂直内面部２６ａと、垂直内面部２６ａの下端につながっていて下窄まりのテーパ面状に形成されたテーパ内面部２６ｂと、テーパ内面部２６ｂの下端につながっていて封止栓１７の頭部２２の下面２２ｃを受け止める受止面部２６ｃとを有しており、注液孔１６の嵌合凹部２６の受止面部２６ｃは、注液孔１６の上下方向に対してほぼ垂直な面になっており、封止栓１７の頭部２２の外周面は、前記下面２２ｃと、注液孔１６の垂直内面部２６ａに対面する垂直外面部２２ａと、注液孔１６のテーパ内面部２６ｂに対面する下窄まりのテーパ面状のテーパ外面部２２ｂとを有することを特徴とする。   In the present invention, as shown in FIGS. 1 and 3, the sealing plug 17 extends downward from the center of the head 22 welded to the upper peripheral edge of the liquid injection hole 16 and the lower surface 22 c of the head 22. The lower surface 22c of the head portion 22 of the sealing plug 17 is substantially perpendicular to the vertical direction of the sealing plug 17, and the liquid injection hole 16 is formed of the sealing plug 17. 17 has a fitting recess 26 into which the head portion 22 is fitted, and a fitting portion 27 into which the shaft portion 23 of the sealing plug 17 is fitted, and the inner peripheral surface of the fitting recess 26 of the liquid injection hole 16 is A vertical inner surface portion 26a extending in a substantially vertical direction with respect to the outer surface of the battery case 6 and forming the periphery of the liquid injection hole 16, and a tapered surface that is connected to the lower end of the vertical inner surface portion 26a and is narrowed down Tapered inner surface portion 26b and a head 22 of sealing plug 17 connected to the lower end of tapered inner surface portion 26b. A receiving surface portion 26c for receiving the lower surface 22c, and the receiving surface portion 26c of the fitting recess 26 of the liquid injection hole 16 is a surface substantially perpendicular to the vertical direction of the liquid injection hole 16, The outer peripheral surface of the head portion 22 of the sealing plug 17 has a constriction facing the lower surface 22c, the vertical outer surface portion 22a facing the vertical inner surface portion 26a of the liquid injection hole 16, and the tapered inner surface portion 26b of the liquid injection hole 16. And a tapered outer surface portion 22b having a tapered surface.

封止栓１７の頭部２２や軸部２３は、横断面で円形や四角形などの形状が含まれる。この封止栓１７の形状に合わせて、注液孔１６の嵌合凹部２６や嵌入部２７の形状が設定される。前記封止栓１７のテーパ外面部２２ｂおよび前記注液孔１６のテーパ内面部２６ｂは、下窄まりの円錐形状の場合や四角錘形状の場合などが含まれる。   The head portion 22 and the shaft portion 23 of the sealing plug 17 include shapes such as a circle and a quadrangle in a cross section. The shapes of the fitting recess 26 and the fitting portion 27 of the liquid injection hole 16 are set in accordance with the shape of the sealing plug 17. The tapered outer surface portion 22b of the sealing plug 17 and the tapered inner surface portion 26b of the liquid injection hole 16 include a conical shape with a constriction and a quadrangular pyramid shape.

注液孔１６の嵌合凹部２６の受止面部２６ｃは、嵌入部２７側の内縁からテーパ内面部２６ｂ側の外縁までの幅寸法Ｌ１が小さいほど、受止面部２６ｃ上に残留する電解液の量を少なくできるが、前記幅寸法Ｌ１を小さくし過ぎると、封止栓１７の頭部２２の下面２２ｃを確実に受け止めることができなくなる。したがって、前記嵌合凹部２６の受止面部２６ｃの前記幅寸法Ｌ１は、0.１〜0.４mmの範囲に設定することが好ましい。   The receiving surface portion 26c of the fitting recess 26 of the liquid injection hole 16 is such that the smaller the width dimension L1 from the inner edge on the fitting portion 27 side to the outer edge on the tapered inner surface portion 26b side, the more the electrolytic solution remaining on the receiving surface portion 26c. Although the amount can be reduced, if the width L1 is too small, the lower surface 22c of the head portion 22 of the sealing plug 17 cannot be reliably received. Therefore, the width dimension L1 of the receiving surface portion 26c of the fitting recess 26 is preferably set in the range of 0.1 to 0.4 mm.

封止栓１７の上端周縁部と注液孔１６の上端周縁部とを確実に溶接するうえでは、封止栓１７と注液孔１６との両方が適正に溶融し、かつ適度な溶接深さになることが好ましく、その点からは封止栓１７の上端周縁部と注液孔１６の上端周縁部との両方が垂直な面であって、かつその垂直面の上下寸法が大きいことが好ましい。つまり、注液孔１６の嵌合凹部２６の垂直内面部２６ａの上下寸法Ｌ２と、封止栓１７の頭部２２の垂直外面部２２ａの上下寸法Ｌ３とが、それぞれ0.１mm以上であることが好ましく、0.２５mm以上であることがより好ましい。注液孔１６の垂直内面部２６ａの上下寸法Ｌ２や封止栓１７の垂直外面部２２ａの上下寸法Ｌ３の上限値は、大きくなり過ぎると、注液孔１６のテーパ内面部２６ｂや封止栓１７のテーパ外面部２２ｂなどを形成できなくなるために、電池ケース６の厚さ寸法に応じて決定される。   In order to reliably weld the upper peripheral edge of the sealing plug 17 and the upper peripheral edge of the liquid injection hole 16, both the sealing plug 17 and the liquid injection hole 16 are properly melted and an appropriate welding depth is obtained. From this point, it is preferable that both the upper peripheral edge of the sealing plug 17 and the upper peripheral edge of the liquid injection hole 16 are vertical surfaces, and the vertical dimension of the vertical surface is large. . That is, the vertical dimension L2 of the vertical inner surface part 26a of the fitting recess 26 of the liquid injection hole 16 and the vertical dimension L3 of the vertical outer surface part 22a of the head part 22 of the sealing plug 17 are each 0.1 mm or more. Is preferable, and it is more preferable that it is 0.25 mm or more. If the upper and lower dimensions L2 of the vertical inner surface 26a of the liquid injection hole 16 and the vertical dimension L3 of the vertical outer surface 22a of the sealing plug 17 become too large, the tapered inner surface 26b of the liquid injection hole 16 and the sealing plug The thickness of the battery case 6 is determined according to the thickness of the battery case 6 because the 17 tapered outer surface portion 22b and the like cannot be formed.

注液孔１６の嵌合凹部２６の受止面部２６ｃに対するテーパ内面部２６ｂの傾斜角度ｄ１が小さくなり過ぎると、テーパ内面部２６ｂ上に電解液が残留するおそれがある。前記テーパ内面部２６ｂの傾斜角度ｄ１が大きくなり過ぎると、前記受止面部２６ｃに対して注液孔１６の上端周縁の周方向の長さ寸法を大きくできなくなり、その分だけ溶接時の熱が、注液孔１６周辺に集中して電池内に過度に伝わってしまい、電極体の変形などを招くおそれがある。したがって、前記テーパ内面部２６ｂの傾斜角度ｄ１は、３０〜６０°の範囲であることが好ましく、４０〜５０°の範囲であることがより好ましい。   If the inclination angle d1 of the tapered inner surface portion 26b with respect to the receiving surface portion 26c of the fitting recess 26 of the liquid injection hole 16 becomes too small, the electrolyte may remain on the tapered inner surface portion 26b. If the inclination angle d1 of the tapered inner surface portion 26b becomes too large, the length in the circumferential direction of the upper peripheral edge of the liquid injection hole 16 cannot be increased with respect to the receiving surface portion 26c, and the heat during welding is correspondingly increased. Then, it may be concentrated around the liquid injection hole 16 and transmitted excessively into the battery, which may cause deformation of the electrode body. Accordingly, the inclination angle d1 of the tapered inner surface portion 26b is preferably in the range of 30 to 60 °, and more preferably in the range of 40 to 50 °.

注液孔１６と封止栓１７との間への電解液の侵入を防止するなどの点から、注液孔１６の嵌入部２７には、封止栓１７の軸部２３が圧入されることが好ましい。   The shaft portion 23 of the sealing plug 17 is press-fitted into the fitting portion 27 of the injection hole 16 from the viewpoint of preventing the electrolyte from entering between the injection hole 16 and the sealing plug 17. Is preferred.

本発明によれば、注液孔１６にテーパ内面部２６ｂを設けたことにより、注液孔１６の上端面を大きくできながら、注液孔１６の受止面部２６ｃの面積を小さくできる。したがって、注液孔１６から電池ケース６内に電解液を注入した際に、注液孔１６の受止面部２６ｃ上に残留する電解液の量を少なくでき、その残留電解液の溶媒が蒸発して電解質が析出しても、その量を少なくできる。つまり、前述の電解質の析出に起因して、注液孔１６の受止面部２６ｃと、封止栓１７の頭部２２の下面２２ｃとの間に隙間が生じることが抑制され、封止栓１７の上端周縁部と注液孔１６の上端周縁部との溶接部にピンホールなどが発生することを防止できる。この結果、電池の密封性が確実に得られる。   According to the present invention, by providing the tapered inner surface portion 26b in the liquid injection hole 16, the area of the receiving surface portion 26c of the liquid injection hole 16 can be reduced while the upper end surface of the liquid injection hole 16 can be increased. Accordingly, when the electrolyte is injected into the battery case 6 from the injection hole 16, the amount of the electrolyte remaining on the receiving surface portion 26c of the injection hole 16 can be reduced, and the solvent of the residual electrolyte is evaporated. Even if the electrolyte is deposited, the amount can be reduced. That is, it is suppressed that a gap is generated between the receiving surface portion 26 c of the liquid injection hole 16 and the lower surface 22 c of the head portion 22 of the sealing plug 17 due to the deposition of the electrolyte. It is possible to prevent the occurrence of a pinhole or the like in the welded portion between the upper end periphery of the liquid injection hole and the upper end periphery of the liquid injection hole 16. As a result, the sealing performance of the battery can be reliably obtained.

しかも、前述のごとく注液孔１６の上端面を大きくできるので、封止栓１７の上端周縁を注液孔１６の上端周縁にレーザなどで溶接する際に、その溶接の熱が狭い面積に集中することが低減できる。これにより、溶接の熱が電池内に過度に伝わって電極体２の変形などを招くことを防止できる。さらに、注液孔１６のテーパ内面部２６ｂの形成部分では、電池ケース６の上下方向の肉厚が大きくなるので、その分だけ注液孔１６の形成部分の電池ケース６の強度が大きくなる。したがって、封止栓１７を注液孔１６に嵌合する際に、注液孔１６の周縁部分の電池ケース６がたわむことを確実に防止できる。   Moreover, since the upper end surface of the liquid injection hole 16 can be enlarged as described above, when welding the upper end periphery of the sealing plug 17 to the upper end periphery of the liquid injection hole 16 with a laser or the like, the heat of the welding is concentrated in a small area. Can be reduced. Accordingly, it is possible to prevent welding heat from being excessively transmitted into the battery and causing deformation of the electrode body 2. Furthermore, since the thickness of the battery case 6 in the vertical direction increases at the portion where the tapered inner surface portion 26b of the liquid injection hole 16 is formed, the strength of the battery case 6 where the liquid injection hole 16 is formed increases accordingly. Therefore, when the sealing plug 17 is fitted into the liquid injection hole 16, it is possible to reliably prevent the battery case 6 at the peripheral portion of the liquid injection hole 16 from being bent.

封止栓１７の頭部２２の上端部と、注液孔１６の上端部とが、それぞれ垂直になっているので、封止栓１７の頭部２２の上端部と注液孔１６の上端部とをレーザなどで溶接する際には、封止栓１７の頭部２２の上端部と注液孔１６の上端部とを均等に溶融できて、封止栓１７と注液孔１６とを確実に溶接できる。   Since the upper end of the head 22 of the sealing plug 17 and the upper end of the liquid injection hole 16 are perpendicular to each other, the upper end of the head 22 of the sealing plug 17 and the upper end of the liquid injection hole 16 Are welded with a laser or the like, the upper end portion of the head portion 22 of the sealing plug 17 and the upper end portion of the liquid injection hole 16 can be evenly melted, and the sealing plug 17 and the liquid injection hole 16 can be securely connected. Can be welded to.

しかも、電池の製造ラインで、パーツフィーダで封止栓の上下の向きを揃え、かつ封止栓を整列させた状態で製造ラインに供給する際には、封止栓１７の頭部２２の下面２２ｃを基準にして封止栓１７を適正な姿勢に整列でき、封止栓１７を適正な姿勢で確実に製造ラインに供給できることになる。   In addition, when the battery plug is supplied to the manufacturing line in a state where the upper and lower directions of the sealing plugs are aligned with the parts feeder and the sealing plugs are aligned, the lower surface of the head 22 of the sealing plug 17 is used. The sealing plug 17 can be aligned in an appropriate posture with reference to 22c, and the sealing plug 17 can be reliably supplied to the production line in an appropriate posture.

本発明に係る密閉型電池は、図１および図２に示すごとく、上面に左右横長の開口を有する有底角筒形状の電池缶１と、電池缶１内に収容された電極体２および非水電解液と、電池缶１の開口上面を塞いで密封する左右横長の蓋３と、蓋３の内側に配置されるプラスチック製の絶縁体５とを含む。電池缶１の左右幅寸法は２9.０mm、上下高さ寸法は４6.０mm、前後厚み寸法は4.２mmである。電池缶１と蓋３とによって電池ケース６が形成される。   As shown in FIGS. 1 and 2, the sealed battery according to the present invention includes a bottomed rectangular tube-shaped battery can 1 having a horizontally long opening on the upper surface, an electrode body 2 housed in the battery can 1, and a non- It includes a water electrolyte, a horizontally long lid 3 that closes and seals the upper surface of the battery can 1, and a plastic insulator 5 that is disposed inside the lid 3. The battery can 1 has a left-right width dimension of 29.0 mm, a vertical height dimension of 46.0 mm, and a front-rear thickness dimension of 4.2 mm. A battery case 6 is formed by the battery can 1 and the lid 3.

電極体２は、図１に示すごとく、帯状の正極と帯状の負極との間に帯状のセパレータを介在させた状態で渦巻状に巻回して作製される。電極体２は、巻回状態で図２に示す扁平状になっている。正極は、コバルト酸リチウムなどの正極活物質を含有する正極活物質層が帯状の正極集電体の裏表両面に形成されており、図１および図２に示すごとく、正極集電体から薄板状の正極集電リード１０が導出される。   As shown in FIG. 1, the electrode body 2 is produced by winding it in a spiral shape with a strip-shaped separator interposed between the strip-shaped positive electrode and the strip-shaped negative electrode. The electrode body 2 has a flat shape shown in FIG. 2 in a wound state. In the positive electrode, a positive electrode active material layer containing a positive electrode active material such as lithium cobaltate is formed on both sides of a belt-like positive electrode current collector. As shown in FIGS. 1 and 2, the positive electrode current collector is formed into a thin plate shape. The positive electrode current collecting lead 10 is derived.

負極は、黒鉛などの負極活物質を含有する負極活物質層が帯状の負極集電体の裏表両面に形成されており、負極集電体から薄板状の負極集電リード１１が導出される。セパレータは、ポリエチレン樹脂などの微多孔性薄膜フィルムなどからなる。非水電解液は、エチレンカーボネートとメチルエチルカーボネートとを混合した溶媒にＬｉＰＦ6 を溶解させて作製した。 In the negative electrode, negative electrode active material layers containing a negative electrode active material such as graphite are formed on both sides of a strip-shaped negative electrode current collector, and a thin plate-shaped negative electrode current collector lead 11 is led out from the negative electrode current collector. The separator is made of a microporous thin film such as polyethylene resin. The non-aqueous electrolyte was prepared by dissolving LiPF 6 in a solvent obtained by mixing ethylene carbonate and methyl ethyl carbonate.

電池缶１は、アルミニウム合金などの板材の深絞り成形品である。蓋３は、アルミニウム合金などの板材のプレス成形品であり、電池缶１の開口周縁に蓋３の外周縁がレーザなどでシーム溶接される。これによって、電池ケース６が形成される。蓋３の中央には、図１に示すごとく、上側の絶縁パッキング１２および下側の絶縁板１３を介して負極端子１５が貫通状に取り付けられる。蓋３の左右方向の右端寄りには、電解液を電池缶１内に注入するための注液孔１６が上下貫通状に形成されている。注液孔１６は、封止栓１７で塞がれる。つまり、注液孔１６に封止栓１７を嵌合させてから、封止栓１７の上端周縁部を注液孔１６の上端周縁部にレーザなどで溶接する。   The battery can 1 is a deep drawn product of a plate material such as an aluminum alloy. The lid 3 is a press-formed product of a plate material such as an aluminum alloy, and the outer peripheral edge of the lid 3 is seam welded to the peripheral edge of the opening of the battery can 1 with a laser or the like. Thereby, the battery case 6 is formed. As shown in FIG. 1, a negative electrode terminal 15 is attached to the center of the lid 3 through an upper insulating packing 12 and a lower insulating plate 13 in a penetrating manner. Near the right end of the lid 3 in the left-right direction, a liquid injection hole 16 for injecting the electrolyte into the battery can 1 is formed in a vertically penetrating manner. The liquid injection hole 16 is closed with a sealing plug 17. That is, after the sealing plug 17 is fitted into the liquid injection hole 16, the upper peripheral edge of the sealing plug 17 is welded to the upper peripheral edge of the liquid injection hole 16 with a laser or the like.

負極端子１５の下端には、蓋３の内面において左右横長の薄板からなるリード体１９が接続される。リード体１９は、注液孔１６の反対側に延びており、前記絶縁板１３で蓋３と絶縁されている。このリード体１９の下面には、負極集電リード１１が溶接される。正極集電リード１０は、蓋３の裏面において絶縁板１３と注液孔１６との間のスペースに溶接される。これで正極集電リード１０が蓋３および電池缶１に導通して、蓋３および電池缶１が正極電位に帯電する。蓋３の左右方向の一端寄り（図２の左端寄り）には、開裂ベント２０が形成されており、開裂ベント２０は、電池内圧が異常上昇したときに開裂して電池内圧を解放する。   Connected to the lower end of the negative electrode terminal 15 is a lead body 19 made of a horizontally long thin plate on the inner surface of the lid 3. The lead body 19 extends to the opposite side of the liquid injection hole 16 and is insulated from the lid 3 by the insulating plate 13. The negative electrode current collector lead 11 is welded to the lower surface of the lead body 19. The positive electrode current collecting lead 10 is welded to the space between the insulating plate 13 and the liquid injection hole 16 on the back surface of the lid 3. Thus, the positive electrode current collecting lead 10 is conducted to the lid 3 and the battery can 1, and the lid 3 and the battery can 1 are charged to the positive electrode potential. A cleaving vent 20 is formed near one end of the lid 3 in the left-right direction (near the left end in FIG. 2). The cleaving vent 20 is cleaved to release the battery internal pressure when the battery internal pressure rises abnormally.

封止栓１７は、図３に示すごとく、注液孔１６の上端周縁部に溶接される円盤状の頭部２２と、その頭部２２の下面２２ｃの中央から下向きに延出する円柱状の軸部２３とを有している。封止栓１７の頭部２２の下面２２ｃは、封止栓１７の軸心（上下方向）に対して垂直となる水平面になっており、さらに封止栓１７の上面２２ｄに対してほぼ平行になっている。頭部２２の外径寸法は、軸部２３の外径寸法よりも大きくなっている。頭部２２の上下厚さ寸法は0.５mmである。   As shown in FIG. 3, the sealing plug 17 is a columnar head 22 that is welded to the peripheral edge of the upper end of the liquid injection hole 16 and a columnar shape that extends downward from the center of the lower surface 22 c of the head 22. And a shaft portion 23. The lower surface 22c of the head portion 22 of the sealing plug 17 is a horizontal plane perpendicular to the axial center (vertical direction) of the sealing plug 17, and is substantially parallel to the upper surface 22d of the sealing plug 17. It has become. The outer diameter dimension of the head portion 22 is larger than the outer diameter dimension of the shaft portion 23. The top and bottom thickness dimension of the head 22 is 0.5 mm.

注液孔１６は、封止栓１７の頭部２２が嵌合する円柱面状の嵌合凹部２６と、封止栓１７の軸部２３が貫通状に圧入（嵌入）される円柱面状の嵌入部２７とを有する。嵌合凹部２６の内周面は、蓋３の上面３ａに対して垂直方向に延びる垂直内面部２６ａと、垂直内面部２６ａの下端につながっていて下窄まりのテーパ面状に形成されたテーパ内面部２６ｂと、テーパ内面部２６ｂの下端につながっていて封止栓１７の頭部２２の下面２２ｃを受け止める受止面部２６ｃとを有する。前記蓋３の上面３ａが、電池ケース６の外表面であって注液孔１６の周縁を形成する面を構成する。   The liquid injection hole 16 has a cylindrical surface-shaped fitting recess 26 into which the head portion 22 of the sealing plug 17 is fitted, and a cylindrical surface shape into which the shaft portion 23 of the sealing plug 17 is press-fitted (inserted). And an insertion portion 27. The inner peripheral surface of the fitting recess 26 is a tapered inner surface 26a that extends in a direction perpendicular to the upper surface 3a of the lid 3 and a tapered surface that is connected to the lower end of the vertical inner surface portion 26a and is constricted. It has an inner surface portion 26b and a receiving surface portion 26c connected to the lower end of the tapered inner surface portion 26b and receiving the lower surface 22c of the head portion 22 of the sealing plug 17. The upper surface 3 a of the lid 3 constitutes a surface that is the outer surface of the battery case 6 and forms the periphery of the liquid injection hole 16.

注液孔１６の受止面部２６ｃは、注液孔１６の軸心（上下方向）に対して垂直となる水平面になっている。注液孔１６の嵌合凹部２６の垂直内面部２６ａの上下寸法Ｌ２は0.３mmである。蓋３の上下厚さ寸法は0.８mm、注液孔１６の嵌入部２７の上下寸法は0.３mmである。注液孔１６の受止面部２６ｃは、嵌入部２７側の内縁からテーパ内面部２６ｂ側の外縁までの幅寸法Ｌ１が0.３mmである。   The receiving surface portion 26 c of the liquid injection hole 16 is a horizontal plane that is perpendicular to the axial center (vertical direction) of the liquid injection hole 16. The vertical dimension L2 of the vertical inner surface portion 26a of the fitting recess 26 of the liquid injection hole 16 is 0.3 mm. The vertical thickness dimension of the lid 3 is 0.8 mm, and the vertical dimension of the fitting portion 27 of the liquid injection hole 16 is 0.3 mm. The receiving surface portion 26c of the liquid injection hole 16 has a width L1 of 0.3 mm from the inner edge on the fitting portion 27 side to the outer edge on the tapered inner surface portion 26b side.

封止栓１７の頭部２２の外周面は、前記下面２２ｃと、注液孔１６の垂直内面部２６ａに対面する円柱面状の垂直外面部２２ａと、垂直外面部２２ａの下端につながっていて注液孔１６のテーパ内面部２６ｂに対面する下窄まりのテーパ面状のテーパ外面部２２ｂとを有する。テーパ外面部２２ｂの下端に前記下面２２ｃがつながっている。   The outer peripheral surface of the head portion 22 of the sealing plug 17 is connected to the lower surface 22c, the columnar vertical outer surface portion 22a facing the vertical inner surface portion 26a of the liquid injection hole 16, and the lower end of the vertical outer surface portion 22a. The liquid injection hole 16 has a tapered outer surface portion 22b having a tapered surface facing the tapered inner surface portion 26b. The lower surface 22c is connected to the lower end of the tapered outer surface portion 22b.

封止栓１７の垂直外面部２２ａの外径寸法は、注液孔１６の垂直内面部２６ａの内径寸法よりもわずかに小さくなっている。封止栓１７のテーパ外面部２２ｂと、注液孔１６のテーパ内面部２６ｂとの間にはわずかに隙間があいている。封止栓１７の垂直外面部２２ａの上下寸法Ｌ３は0.３mmである。   The outer diameter size of the vertical outer surface portion 22 a of the sealing plug 17 is slightly smaller than the inner diameter size of the vertical inner surface portion 26 a of the liquid injection hole 16. There is a slight gap between the tapered outer surface portion 22 b of the sealing plug 17 and the tapered inner surface portion 26 b of the liquid injection hole 16. The vertical dimension L3 of the vertical outer surface portion 22a of the sealing plug 17 is 0.3 mm.

注液孔１６の受止面部２６ｃに対するテーパ内面部２６ｂの傾斜角度ｄ１は４５°である。封止栓１７の頭部２２のテーパ外面部２２ｂの傾斜角度は、注液孔１６のテーパ内面部２６ｂの傾斜角度ｄ１に等しく設定される。封止栓１７のテーパ外面部２２ｂは、Ｃ0.１５〜Ｃ0.２５のＣ面取加工で形成される。   The inclination angle d1 of the tapered inner surface portion 26b with respect to the receiving surface portion 26c of the liquid injection hole 16 is 45 °. The inclination angle of the tapered outer surface portion 22b of the head portion 22 of the sealing plug 17 is set equal to the inclination angle d1 of the tapered inner surface portion 26b of the liquid injection hole 16. The tapered outer surface portion 22b of the sealing plug 17 is formed by C chamfering of C0.15 to C0.25.

封止栓１７の軸部２３の外周面は、蓋３の上面に対して垂直方向に形成された円柱面状の垂直面部２３ａと、垂直面部２３ａの下端につながっていて下窄まりのテーパ面状に形成された案内面部２３ｂとを有する。案内面部２３ｂは、封止栓１７を注液孔１６へ嵌合する際に、封止栓１７の軸部２３を注液孔１６の嵌入部２７へ案内する。封止栓１７の上面には、図１に示すリング状の溝２５が形成されている。   The outer peripheral surface of the shaft portion 23 of the sealing plug 17 is connected to the columnar vertical surface portion 23a formed in the direction perpendicular to the upper surface of the lid 3 and the lower end of the vertical surface portion 23a, and the tapered surface is constricted. And a guide surface portion 23b formed in a shape. The guide surface portion 23 b guides the shaft portion 23 of the sealing plug 17 to the fitting portion 27 of the liquid injection hole 16 when the sealing plug 17 is fitted into the liquid injection hole 16. A ring-shaped groove 25 shown in FIG. 1 is formed on the upper surface of the sealing plug 17.

注液孔１６の嵌入部２７の内径寸法は、圧入前の封止栓１７の軸部２３の外形寸法に等しく、あるいはわずかに小さく設定してある。封止栓１７を注液孔１６に圧入したときには、図１に示すごとく、封止栓１７の軸部２３の下部が注液孔１６の下側に突出する。   The inner diameter dimension of the fitting part 27 of the liquid injection hole 16 is set to be equal to or slightly smaller than the outer dimension of the shaft part 23 of the sealing plug 17 before press-fitting. When the sealing plug 17 is press-fitted into the liquid injection hole 16, the lower portion of the shaft portion 23 of the sealing plug 17 protrudes below the liquid injection hole 16 as shown in FIG. 1.

電池の組み立てに際しては、蓋３に対して、前述のように負極端子１５、絶縁パッキング１２、絶縁板１３およびリード体１９をそれぞれ取り付けておく。そして、電極体２および絶縁体５を電池缶１内に収容したのちに、負極集電リード１１をリード体１９に、正極集電リード１０を蓋３にそれぞれ前述の要領で溶接する。次いで、電池缶１の開口周縁に蓋３をシーム溶接したのちに、電池缶１内を真空減圧して注液孔１６から非水電解液を注入する。   When assembling the battery, the negative electrode terminal 15, the insulating packing 12, the insulating plate 13, and the lead body 19 are attached to the lid 3 as described above. And after accommodating the electrode body 2 and the insulator 5 in the battery can 1, the negative electrode current collection lead 11 is welded to the lead body 19, and the positive electrode current collection lead 10 is welded to the lid 3 as described above. Next, after the lid 3 is seam welded to the periphery of the opening of the battery can 1, the inside of the battery can 1 is vacuum-reduced and a nonaqueous electrolyte is injected from the liquid injection hole 16.

前記注入完了後に、注液孔１６に封止栓１７を挿入して、注液孔１６の嵌入部２７に封止栓１７の軸部２３を圧入し、次いで注液孔１６の嵌合凹部２６内に入り込んだ封止栓１７の頭部２２の上端周縁に沿ってレーザでシーム溶接することで、注液孔１６が、封止栓１７で塞がれた状態に封口される。   After completion of the injection, the sealing plug 17 is inserted into the liquid injection hole 16, the shaft portion 23 of the sealing plug 17 is press-fitted into the insertion part 27 of the liquid injection hole 16, and then the fitting recess 26 of the liquid injection hole 16. The liquid injection hole 16 is sealed in a state of being sealed with the sealing plug 17 by performing seam welding along the upper end periphery of the head 22 of the sealing plug 17 that has entered.

前記封止栓１７は、電池ケース６のいずれかの個所に設けてあればよく、例えば電池缶１の底面や側面に設けてもよい。   The sealing plug 17 may be provided at any part of the battery case 6, and may be provided, for example, on the bottom surface or side surface of the battery can 1.

本発明に係る密閉型電池の縦断正面図Vertical front view of a sealed battery according to the present invention 密閉型電池の分解斜視図Disassembled perspective view of sealed battery 封止栓および注液孔の断面を示す拡大図Enlarged view showing the cross section of the sealing plug and liquid injection hole

符号の説明Explanation of symbols

１ 電池缶
３ 蓋
１６ 注液孔
１７ 封止栓
２２ 頭部
２２ａ 垂直外面部
２２ｂ テーパ外面部
２２ｃ 下面
２３ 軸部
２３ａ 垂直面部
２３ｂ 案内面部
２６ 嵌合凹部
２６ａ 垂直内面部
２６ｂ テーパ内面部
２６ｃ 受止面部
２７ 嵌入部 DESCRIPTION OF SYMBOLS 1 Battery can 3 Cover 16 Injection hole 17 Seal plug 22 Head 22a Vertical outer surface part 22b Tapered outer surface part 22c Lower surface 23 Shaft part 23a Vertical surface part 23b Guide surface part 26 Fitting recessed part 26a Vertical inner surface part 26b Tapered inner surface part 26c Receipt Surface part 27 Insertion part

Claims (5)

電池ケースに設けた注液孔から前記電池ケース内に電解液を注入したのちに、前記注液孔に封止栓を嵌合させて前記封止栓の上端周縁部を前記注液孔の上端周縁部に溶接することで、前記注液孔が封口される密閉型電池において、
前記封止栓は、前記注液孔の上端周縁部に溶接される頭部と、その頭部の下面の中央から下向きに延出する軸部とを有しており、
前記封止栓の頭部の下面は、前記封止栓の上下方向に対して垂直になっており、
前記注液孔は、前記封止栓の頭部が嵌合する嵌合凹部と、前記封止栓の軸部が嵌入する嵌入部とを有しており、
前記嵌合凹部の内周面は、前記電池ケースの外表面であって前記注液孔の周縁を形成する面に対して垂直方向に延びる垂直内面部と、前記垂直内面部の下端につながっていて下窄まりのテーパ面状に形成されたテーパ内面部と、前記テーパ内面部の下端につながっていて前記封止栓の頭部の下面を受け止める受止面部とを有しており、
前記受止面部は、前記注液孔の上下方向に対して垂直な面になっており、
前記封止栓の頭部の外周面は、前記下面と、前記注液孔の垂直内面部に対面する垂直外面部と、前記注液孔のテーパ内面部に対面する下窄まりのテーパ面状のテーパ外面部とを有することを特徴とする密閉型電池。 After injecting the electrolyte into the battery case from the liquid injection hole provided in the battery case, a sealing plug is fitted into the liquid injection hole, and the upper peripheral edge of the sealing plug is the upper end of the liquid injection hole. In the sealed battery in which the liquid injection hole is sealed by welding to the peripheral part,
The sealing plug has a head portion welded to the upper peripheral edge of the liquid injection hole, and a shaft portion extending downward from the center of the lower surface of the head portion,
The lower surface of the head of the sealing plug is perpendicular to the vertical direction of the sealing plug,
The liquid injection hole has a fitting recess into which a head portion of the sealing plug is fitted, and a fitting portion into which a shaft portion of the sealing plug is fitted,
An inner peripheral surface of the fitting recess is connected to a vertical inner surface portion extending in a direction perpendicular to a surface forming the outer periphery of the battery injection hole and a lower end of the vertical inner surface portion. A tapered inner surface formed in a tapered shape, and a receiving surface connected to the lower end of the tapered inner surface and receiving the lower surface of the head of the sealing plug,
The receiving surface portion is a surface perpendicular to the vertical direction of the liquid injection hole,
The outer peripheral surface of the head of the sealing plug has a tapered surface with a bottom surface facing the lower inner surface, a vertical outer surface facing the vertical inner surface of the liquid injection hole, and a taper inner surface of the liquid injection hole. And a tapered outer surface portion. 前記注液孔の嵌合凹部の受止面部は、前記嵌入部側の内縁から前記テーパ内面部側の外縁までの幅寸法が0.１〜0.４mmの範囲である請求項１記載の密閉型電池。   The sealing surface according to claim 1, wherein the receiving surface portion of the fitting recess of the liquid injection hole has a width dimension in the range from 0.1 to 0.4 mm from the inner edge on the fitting portion side to the outer edge on the tapered inner surface portion side. Type battery. 前記注液孔の嵌合凹部の垂直内面部の上下寸法と、前記封止栓の頭部の垂直外面部の上下寸法とが、それぞれ0.１mm以上である請求項１又は２記載の密閉型電池。   The hermetic mold according to claim 1 or 2, wherein the vertical dimension of the vertical inner surface part of the fitting recess of the liquid injection hole and the vertical dimension of the vertical outer surface part of the head portion of the sealing plug are each 0.1 mm or more. battery. 前記注液孔の受止面部に対する前記テーパ内面部の傾斜角度が、３０〜６０°の範囲である請求項１又は２又は３記載の密閉型電池。   4. The sealed battery according to claim 1, wherein an inclination angle of the tapered inner surface portion with respect to the receiving surface portion of the liquid injection hole is in a range of 30 to 60 °. 前記封止栓の軸部が、前記注液孔の嵌入部に圧入されている請求項１又は２又は３又は４記載の密閉型電池。   The sealed battery according to claim 1, 2, 3, or 4, wherein the shaft portion of the sealing plug is press-fitted into the fitting portion of the liquid injection hole.
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