JP2007018915A - Sealed battery - Google Patents

Sealed battery Download PDF

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JP2007018915A
JP2007018915A JP2005200320A JP2005200320A JP2007018915A JP 2007018915 A JP2007018915 A JP 2007018915A JP 2005200320 A JP2005200320 A JP 2005200320A JP 2005200320 A JP2005200320 A JP 2005200320A JP 2007018915 A JP2007018915 A JP 2007018915A
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sealing plug
injection hole
sealing
battery
sealed
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Masaki Takeyama
正起 竹山
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Tokin Corp
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NEC Tokin Tochigi Ltd
NEC Tokin Corp
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Priority to JP2005200320A priority Critical patent/JP2007018915A/en
Publication of JP2007018915A publication Critical patent/JP2007018915A/en
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Sealing Battery Cases Or Jackets (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate defective sealing due to adhesion of an electrolytic solution and reduce susceptibility to heat in attaching a sealing plug to a liquid pouring hole of the electrolytic solution of a sealed battery and sealing the hole by laser welding. <P>SOLUTION: Recessed parts 12, 22 are installed at the sealing plug 1 and the liquid pouring hole 7 of a cap body 2, a metal O-ring 4 is pinched in between, airtightness is improved by wedging a metal into the sealing plug 1 and the liquid pouring hole 7 of the cap body 2 when pressing in the sealing plug 1, thereby reduction of an electrolytic solution leakage in the laser welding is realized. Otherwise, a convex part is formed at one side of a contact face of the sealing plug 1 and a contact face of the cap body 2, and a recessed part is formed at the other side thereof, by the above, it is made so that a force is impressed on the sealing plug 1 and the liquid pouring hole 7 of the cap body 2 when press fitting the sealing plug before laser welding, and thrusting airtightness is heightened. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、密閉型電池に関し、電解液を注液した後に封止する電解液注液孔および封止栓の構造に関する。   The present invention relates to a sealed battery, and relates to a structure of an electrolyte solution injection hole and a sealing plug that are sealed after an electrolyte solution is injected.

小型の電子機器の電源として各種の電池が用いられており、携帯電話、ノートパソコン等の電源として、小型で大容量の密閉型電池が用いられ、近年は特にエネルギー密度が高いリチウムイオン電池等の非水電解液を使用した密閉型電池が用いられている。リチウムイオン電池は、アルミニウムまたはその合金からなる電池缶にセパレータを介して正極と負極を積層して巻回、成型した電池要素を収納し蓋体を電池缶に嵌合させ溶接して封口し、電解液注液孔から所定の量の電解液を注液した後、電解液注液孔に封止栓を装着し、レーザー溶接により、封止を行っている。レーザー溶接においては、電解液注液孔に付着した電解液による溶接不良による封止不良が生じたり、あるいは電解液注液孔と、封止栓との嵌合不良による封止不良を生じることがあった。   Various types of batteries are used as power sources for small electronic devices, and small and large-capacity sealed batteries are used as power sources for mobile phones, notebook computers, etc. A sealed battery using a non-aqueous electrolyte is used. Lithium ion battery is a battery can made of aluminum or an alloy thereof, laminated and wound with a positive electrode and a negative electrode through a separator, accommodates the molded battery element, fits a lid to the battery can, welds and seals, After injecting a predetermined amount of electrolyte from the electrolyte injection hole, a sealing plug is attached to the electrolyte injection hole, and sealing is performed by laser welding. In laser welding, sealing failure may occur due to poor welding due to electrolyte adhering to the electrolyte injection hole, or sealing failure may occur due to poor fitting between the electrolyte injection hole and the sealing plug. there were.

図４は従来の密閉型電池の注液孔封止工程を説明する図であり、図４（ａ）は封止栓の平面図、図４（ｂ）は封止栓を注液孔に挿入する前の状態の説明図、図４（ｃ）は封止栓を注液孔７に挿入し溶接した状態の説明図である。部品寸法のばらつきにより注液孔７と封止栓１との間に僅かな空隙が生じることがあり、注液孔７に付着した電解液が毛細管現象等により空隙部を通ってレーザー溶接部３まで到達することがあり、レーザー溶接部３に電解液が存在する場合には溶接不良の原因となっていた。   4A and 4B are diagrams for explaining the injection hole sealing process of a conventional sealed battery. FIG. 4A is a plan view of the sealing plug, and FIG. 4B is an insertion of the sealing plug into the injection hole. FIG. 4C is an explanatory diagram of a state before the sealing is performed, and FIG. 4C is an explanatory diagram of a state in which the sealing plug is inserted into the liquid injection hole 7 and welded. There may be a slight gap between the injection hole 7 and the sealing plug 1 due to variations in the dimensions of the parts, and the electrolyte adhering to the injection hole 7 passes through the gap due to a capillary phenomenon or the like, and the laser weld 3 In the case where an electrolytic solution is present in the laser welded part 3, it causes a welding failure.

特許文献1では、注液孔に弾性を有する材料を圧入した密閉型電池が提案されているが、弾性を有する材料が例示されているＥＰゴムである場合には、耐熱性が電池缶および蓋体の材料となっているアルミニウム等の金属に比べ劣るため、レーザー溶接時の熱の影響を受け劣化する恐れがあった。   Patent Document 1 proposes a sealed battery in which an elastic material is press-fitted into a liquid injection hole. However, in the case of an EP rubber exemplified by an elastic material, the heat resistance has a battery can and a lid. Since it is inferior to metals such as aluminum, which is a body material, there is a risk of deterioration due to the influence of heat during laser welding.

特開２０００−２６８８１１号公報JP 2000-268811 A

本発明の課題は、注液孔に封止栓を装着しレーザー溶接によって封止を行う際に電解液の付着による封止不良がなく熱の影響による封止不良もない密閉型電池を提供することにある。   An object of the present invention is to provide a sealed battery in which a sealing plug is attached to a liquid injection hole and sealing is not performed due to adhesion of an electrolyte solution and sealing failure due to the influence of heat when sealing is performed by laser welding. There is.

前記課題を解決するため、本発明の密閉型電池はアルミニウムもしくはアルミニウム合金からなる電池缶、または前記電池缶の開口部を封口する蓋体に設けられた段部を備えた電解液注液孔に、フランジ部を備えた封止栓を装着し、溶接封止する密閉型電池において、前記注液孔の段部および前記封止栓のフランジ部に互いに対向する同心円状の凹部を設け、前記凹部が装着時に潰れ部を形成するように前記凹部に金属製Ｏリングを配したことを特徴とする。また、前記注液孔の段部あるいは前記封止栓のフランジ部の一方に同心円状に凹部を有し、他方に前記凹部と対向する凸部を有し、前記凹部または前記凸部の少なくとも一方が装着時に潰れた状態になることを特徴とする。   In order to solve the above-mentioned problems, the sealed battery of the present invention has a battery can made of aluminum or an aluminum alloy, or an electrolyte injection hole provided with a step provided on a lid that seals the opening of the battery can. In a sealed battery that is fitted with a sealing plug having a flange portion and welded and sealed, concentric recesses facing each other are provided on the step portion of the injection hole and the flange portion of the sealing plug, and the recess Is characterized in that a metal O-ring is arranged in the recess so as to form a crushed portion when mounted. Further, one of the step portion of the liquid injection hole or the flange portion of the sealing plug has a concentric concave portion, and the other has a convex portion facing the concave portion, and at least one of the concave portion or the convex portion. Is in a state of being crushed when worn.

本発明の密閉型電池によれば、電解液注液孔に封止栓を装着する際に圧入により注液孔または封止栓に設けた同心円状の凹部または凸部が潰れて金属が食い込み気密性を保つことにより、レーザ溶接時に電池缶内部からの電解液の漏出を防止することができ、電解液付着によるレーザー溶接不良のない安定したレーザー溶接を行うことが可能となり、熱による影響も少ない封止不良の少ない密閉型電池を提供できる。   According to the sealed battery of the present invention, when the sealing plug is attached to the electrolyte injection hole, the concentric concave or convex portion provided in the injection hole or the sealing plug is crushed by press-fitting and the metal bites into the gas-tight airtight. By maintaining the characteristics, it is possible to prevent leakage of the electrolyte from the inside of the battery can during laser welding, and it is possible to perform stable laser welding without laser welding failure due to electrolyte adhesion, and there is little influence from heat A sealed battery with few sealing defects can be provided.

次に、本発明の実施の形態を図面を参照して説明する。   Next, embodiments of the present invention will be described with reference to the drawings.

図１は、本発明の密閉型電池を説明する図であり、図１（ａ）は密閉型電池を説明する斜視図であり、図1（ｂ）は密閉型電池の平面図であり、図１（ｃ）は図１（ｂ）の電解液注液孔部分をＡ−Ａ線で切断した断面図であり、図１（ｄ）は図１（ｃ）の注液孔の封止工程を説明する断面図であり、図１（ｅ）はＯリングの斜視図である。   FIG. 1 is a diagram illustrating a sealed battery of the present invention, FIG. 1A is a perspective view illustrating a sealed battery, and FIG. 1B is a plan view of the sealed battery. 1 (c) is a cross-sectional view of the electrolyte injection hole portion of FIG. 1 (b) cut along line AA, and FIG. 1 (d) shows the sealing step of the injection hole of FIG. 1 (c). FIG. 1 (e) is a perspective view of an O-ring.

本発明の密閉型電池は、電池缶５内に電池要素を収納した後に、電池缶５の開口部を蓋体２で封口したものであり蓋体２は中央部に電極端子６を有するとともに電解液の注液孔７を有している。電解液注液孔は、蓋体を構成する板状の部材に段部２１を有し段部２１に注液孔７を中心とする円状に凹部２２を有している。段部２１および凹部２２は、プレス加工等により形成される。封止栓１は注液孔の段部２１に収まるフランジ部１１と電解液注液部に収まる先端が細くなった略円柱状の突出部から形成され、フランジ部１１には注液孔７の段部の凹部２２と対向するように円状に凹部１２を有している。   In the sealed battery of the present invention, after the battery element is housed in the battery can 5, the opening of the battery can 5 is sealed with the lid 2, and the lid 2 has the electrode terminal 6 at the center and is electrolyzed. A liquid injection hole 7 is provided. The electrolyte solution injection hole has a stepped portion 21 in a plate-like member constituting the lid, and the stepped portion 21 has a concave portion 22 in a circular shape centered on the liquid injection hole 7. The stepped portion 21 and the recessed portion 22 are formed by pressing or the like. The sealing plug 1 is formed of a flange portion 11 that fits in the step portion 21 of the liquid injection hole and a substantially cylindrical protruding portion that has a thin tip that fits in the electrolyte liquid injection portion. The concave portion 12 is circularly formed so as to face the concave portion 22 of the stepped portion.

電解液の注液孔７より電解液を注液した後、注液孔段部の凹部２２と、封止栓フランジ部の凹部１２との間にＯリング４を配し、注液孔の段部２１と封止栓のフランジ部１１が密着するように封止栓１を注液孔７に圧入する。Ｏリング４は、封止栓１が圧入された際に注液孔７および封止栓の凹部１２を潰しながら食い込む形状にし、潰れ部８により密閉状態を形成する。密閉状態を形成する形状の一例としては、凹部として断面Ｖ字状の溝を設け、Ｏリングは断面長方形状にすることができる。凹部の全周にわたって潰れ部８により密閉状態となった後、レーザー溶接を行う。   After injecting the electrolytic solution from the electrolytic solution injection hole 7, an O-ring 4 is arranged between the concave portion 22 of the injection hole step portion and the concave portion 12 of the sealing plug flange portion. The sealing plug 1 is press-fitted into the liquid injection hole 7 so that the portion 21 and the flange portion 11 of the sealing plug are in close contact with each other. When the sealing plug 1 is press-fitted into the O-ring 4, the O-ring 4 is shaped so as to bite while crushing the liquid injection hole 7 and the concave portion 12 of the sealing plug, and the crushing portion 8 forms a sealed state. As an example of the shape that forms a sealed state, a groove having a V-shaped cross section is provided as a recess, and the O-ring can be formed into a rectangular cross section. Laser welding is performed after the crushing portion 8 is hermetically sealed over the entire circumference of the recess.

注液孔７と封止栓１で潰れ部８により密閉状態を形成しているので、電解液が漏出してくることがなく、安定したレーザー溶接を行うことができる。Ｏリングは耐腐食性の金属例えば、ステンレス、チタン、タングステンなどが好ましい。注液孔７と、封止栓１でレーザー溶接前に密閉状態を形成するためには、必ずしもＯリングを使用する必要はなく、注液孔の段部２１あるいは封止栓のフランジ部１１の一方に凹部２２，１２、他方の対向する部分に凸部を設け、封止栓１を注液孔７に密着するように圧入する際、凸部が凹部を潰しながら食い込めばよい。   Since the liquid injection hole 7 and the sealing plug 1 form a sealed state by the crushed portion 8, the electrolyte does not leak and stable laser welding can be performed. The O-ring is preferably a corrosion-resistant metal such as stainless steel, titanium, or tungsten. In order to form a sealed state before laser welding with the liquid injection hole 7 and the sealing plug 1, it is not always necessary to use an O-ring, and the step 21 of the liquid injection hole or the flange part 11 of the sealing plug The concave portions 22 and 12 are provided on one side, and convex portions are provided on the other facing portion, and when the sealing plug 1 is press-fitted so as to be in close contact with the liquid injection hole 7, the convex portions may dig into the concave portions while crushing.

例えば凸部の断面形状が長方形、凹部の断面形状がＶ字状の組合せ、凸部の断面形状がＶ字状、凹部の断面形状が長方形の組合せがある。Ｏリングを使用しない場合には部品数を低減する利点がある。   For example, there are combinations in which the cross-sectional shape of the convex portion is rectangular, the cross-sectional shape of the concave portion is V-shaped, the cross-sectional shape of the convex portion is V-shaped, and the cross-sectional shape of the concave portion is rectangular. When the O-ring is not used, there is an advantage of reducing the number of parts.

図２は、本発明の密閉型電池の他の電解液注液孔を説明する図であり、図２（ａ）は注液孔の封止工程を説明する断面図であり、図２（ｂ）は注液孔の封止後の断面図である。電解液の注液孔７（図１参照）は、蓋体２を構成する板状の部材に段部２１を有し段部２１に注液孔７を中心とする円状に断面長方形状の凸部２３を有している。封止栓１は注液孔の段部２１に収まるフランジ部１１と電解液注液部に収まる先端が細くなった略円柱状の突出部から形成され、フランジ部１１には注液孔７の段部の凸部２３と対向するように円状に断面Ｖ字上の凹部１２を有している。   FIG. 2 is a view for explaining another electrolyte solution injection hole of the sealed battery of the present invention. FIG. 2 (a) is a cross-sectional view for explaining the injection hole sealing step, and FIG. ) Is a cross-sectional view after sealing the liquid injection hole. The electrolyte injection hole 7 (see FIG. 1) has a stepped portion 21 in a plate-like member constituting the lid body 2 and has a rectangular cross section in a circular shape around the injection hole 7 in the stepped portion 21. Convex part 23 is provided. The sealing plug 1 is formed of a flange portion 11 that fits in the step portion 21 of the liquid injection hole and a substantially cylindrical protruding portion that has a thin tip that fits in the electrolyte liquid injection portion. A concave portion 12 having a V-shaped cross section is formed in a circular shape so as to face the convex portion 23 of the stepped portion.

電解液の注液孔７より電解液を注液した後、注液孔の段部２１と封止栓のフランジ部１１が密着するように封止栓１を注液孔７に圧入し、注液孔段部の凸部２３と、封止栓フランジ部の凹部１２が、お互いに潰し合うようにして円周上に潰れ部８により密閉状態を形成する。   After injecting the electrolyte from the electrolyte injection hole 7, the sealing plug 1 is press-fitted into the injection hole 7 so that the step 21 of the injection hole and the flange 11 of the sealing plug are in close contact with each other. The convex part 23 of the liquid hole step part and the concave part 12 of the sealing plug flange part form a sealed state by the crushed part 8 on the circumference so as to be crushed.

図３は、本発明の密閉型電池の電解液注液孔を説明する図であり、図３（ａ）は注液孔の封止工程を説明する断面図であり、図３（ｂ）は注液孔の封止後の断面図である。電解液の注液孔７（図１参照）は、蓋体２を構成する板状の部材に段部２１を有し段部２１に注液孔７を中心とする円状に断面Ｖ字状の凹部を有している。封止栓１は、注液孔の段部２１に収まるフランジ部１１と電解液注液部に収まる先端が細くなった略円柱状の突出部から形成され、フランジ部１１には注液孔の段部の凹部と対向するように円状に断面長方形状の凸部１３を有している。電解液の注液孔７より電解液を注液した後、注液孔の段部２１と封止栓のフランジ部１１が密着するように封止栓１を注液孔７に圧入し、注液孔段部の凹部と、封止栓フランジ部の凸部１３が、お互いに潰し合うようにして円周上に潰れ部８により密閉状態を形成する。   FIG. 3 is a view for explaining the electrolyte injection hole of the sealed battery of the present invention, FIG. 3 (a) is a cross-sectional view for explaining the injection hole sealing step, and FIG. It is sectional drawing after sealing of a liquid injection hole. The electrolyte injection hole 7 (see FIG. 1) has a stepped portion 21 on a plate-like member constituting the lid 2, and the stepped portion 21 has a circular V-shaped cross section centered on the injection hole 7. Has a recess. The sealing plug 1 is formed of a flange portion 11 that fits in the step portion 21 of the liquid injection hole and a substantially cylindrical protrusion that has a thin tip that fits in the electrolyte liquid injection portion. A convex portion 13 having a rectangular cross section is formed in a circular shape so as to face the concave portion of the stepped portion. After injecting the electrolyte from the electrolyte injection hole 7, the sealing plug 1 is press-fitted into the injection hole 7 so that the step 21 of the injection hole and the flange 11 of the sealing plug are in close contact with each other. The concave portion of the liquid hole step portion and the convex portion 13 of the sealing plug flange portion form a sealed state by the crushed portion 8 on the circumference so as to be crushed with each other.

幅３０ｍｍ、高さ４８ｍｍ、厚さ４ｍｍのアルミニウム合金（Ａ３００３）製の電池缶に電池要素を収納した後、図１に示すように、段部２１の直径２．０ｍｍ深さ０．５ｍｍで中心に直径０．５ｍｍの貫通孔を有した注液孔７に、段部２１の直径１．２ｍｍの円上に角度９０度深さ０．２ｍｍのＶ溝からなる凹部を設けた厚さ１ｍｍのアルミニウム合金（Ａ３００３）製の蓋体２を電池缶に嵌合し溶接して封口する。電解液として六フッ化燐酸リチウムを電解質としてジエチルカーボネート（ＤＥＣ）とエチレンカーボネート（ＥＣ）の混合溶媒に溶解したものを注液孔７から注液した後、フランジ部１１の直径２．０ｍｍ、厚さ０．５ｍｍ、フランジの中心から中心の高さ０．８ｍｍ、直径０．５ｍｍの略円柱状の突出部を有し、フランジ部の中心から直径１．２ｍｍの円上に角度９０度深さ０．２ｍｍのＶ溝からなる凹部１２を設けた封止栓１を、断面形状が一辺０．２４ｍｍの正方形となる、内径０．９６ｍｍ、外径１．４４ｍｍのステンレス製Ｏリング４を 注液孔段部の凹部と、封止栓フランジ部の凹部１２に挟むようにして、注液孔７に圧入し、レーザー溶接を行った。作製した５００個のリチウムイオン電池について、レーザー溶接後の封止不良を確認したところ、不良の発生はなかった。   After the battery element is housed in a battery can made of an aluminum alloy (A3003) having a width of 30 mm, a height of 48 mm, and a thickness of 4 mm, as shown in FIG. 1, the step portion 21 has a diameter of 2.0 mm and a depth of 0.5 mm. In the liquid injection hole 7 having a through hole having a diameter of 0.5 mm, a recess having a V groove having an angle of 90 degrees and a depth of 0.2 mm is provided on a circle having a diameter of 1.2 mm of the stepped portion 21. A lid 2 made of aluminum alloy (A3003) is fitted into a battery can, welded and sealed. A solution prepared by dissolving lithium hexafluorophosphate as an electrolyte in a mixed solvent of diethyl carbonate (DEC) and ethylene carbonate (EC) as an electrolyte was injected from the injection hole 7, and then the flange portion 11 had a diameter of 2.0 mm and a thickness. It has a length of 0.5 mm, a height of 0.8 mm from the center of the flange, and a substantially cylindrical protrusion having a diameter of 0.5 mm, and a depth of 90 degrees on a circle with a diameter of 1.2 mm from the center of the flange. A sealing plug 1 provided with a recess 12 made of a 0.2 mm V-groove is filled with a stainless steel O-ring 4 having an inner diameter of 0.96 mm and an outer diameter of 1.44 mm, the cross-sectional shape of which is a square having a side of 0.24 mm. Laser welding was performed by press-fitting the liquid injection hole 7 so as to be sandwiched between the concave portion of the hole step portion and the concave portion 12 of the sealing plug flange portion. About 500 produced lithium ion batteries, when the sealing defect after laser welding was confirmed, there was no generation | occurrence | production of a defect.

Ｏリングを使用せず、注液孔と封止栓の構造を変更した以外は実施例1と同様にリチウムイオン電池を作製した。図２に示すように、蓋体２に段部２１の直径２．０ｍｍ深さ０．５ｍｍで中心に直径０．５ｍｍの貫通孔を有した注液孔７に、段部２１に内径０．９６ｍｍ、外径１．４４ｍｍ、高さ０．２４ｍｍのドーナツ上の凸部２３を設けた。フランジ部１１の直径２．０ｍｍ、厚さ０．５ｍｍの封止栓のフランジ部１１の中心から直径１．２ｍｍの円上に角度９０度深さ０．２ｍｍのＶ溝からなる凹部１２を設けた封止栓１を注液孔７に圧入し、レーザー溶接を行った。作製した５００個のリチウムイオン電池について、レーザー溶接後の封止不良を確認したところ、不良の発生はなかった。   A lithium ion battery was produced in the same manner as in Example 1 except that the O-ring was not used and the structure of the liquid injection hole and the sealing plug was changed. As shown in FIG. 2, the lid 2 has a liquid injection hole 7 having a through hole having a diameter of 2.0 mm and a depth of 0.5 mm and a diameter of 0.5 mm at the center. The convex part 23 on the donut of 96 mm, outer diameter 1.44 mm, and height 0.24 mm was provided. A concave portion 12 comprising a V-groove having an angle of 90 ° and a depth of 0.2 mm is provided on a circle having a diameter of 1.2 mm from the center of the flange portion 11 of the sealing plug having a diameter of 2.0 mm and a thickness of 0.5 mm. The sealed stopper 1 was press-fitted into the injection hole 7 and laser welding was performed. About 500 produced lithium ion batteries, when the sealing defect after laser welding was confirmed, there was no generation | occurrence | production of a defect.

注液孔と封止栓の構造を変更した以外は実施例２と同様にリチウムイオン電池を作製した。図３に示すように、蓋体２に段部２１の直径２．０ｍｍ深さ０．５ｍｍで中心に直径０．５ｍｍの貫通孔を有した注液孔７に、段部２１の直径１．２ｍｍの円上に角度９０度深さ０．２ｍｍのＶ溝からなる凹部を設けた。フランジ部１１の直径２．０ｍｍ、厚さ０．５ｍｍの封止栓１のフランジ部１１に内径０．９６ｍｍ、外径１．４４ｍｍ、高さ０．２４ｍｍのドーナツ上の凸部１３を設けた封止栓１を注液孔７に圧入し、レーザー溶接を行った。作製した５００個のリチウムイオン電池について、レーザー溶接後の封止不良を確認したところ、不良の発生はなかった。   A lithium ion battery was produced in the same manner as in Example 2 except that the structure of the liquid injection hole and the sealing plug was changed. As shown in FIG. 3, the diameter 2 of the stepped portion 21 is set in the liquid injection hole 7 having a through hole having a diameter of 2.0 mm and a depth of 0.5 mm of the stepped portion 21 and a diameter of 0.5 mm in the center. A recess made of a V groove having an angle of 90 degrees and a depth of 0.2 mm was provided on a 2 mm circle. A convex portion 13 on a donut having an inner diameter of 0.96 mm, an outer diameter of 1.44 mm, and a height of 0.24 mm is provided on the flange portion 11 of the sealing plug 1 having a diameter of 2.0 mm and a thickness of 0.5 mm. The sealing plug 1 was press-fitted into the liquid injection hole 7 and laser welding was performed. About 500 produced lithium ion batteries, when the sealing defect after laser welding was confirmed, there was no generation | occurrence | production of a defect.

（比較例）
注液孔と封止栓の構造を変更した以外は実施例２と同様にリチウムイオン電池を作製した。図４に示すように、蓋体２に段部２１の直径２．０ｍｍ深さ０．５ｍｍで中心に直径０．５ｍｍの貫通孔を有した注液孔７に、フランジ部１１の直径２．０ｍｍ、厚さ０．５ｍｍの封止栓１を注液孔７に圧入し、レーザー溶接を行った。作製した５００個のリチウムイオン電池について、レーザー溶接後の封止不良を確認したところ、３個ピンホールによる溶接不良が発生した。 (Comparative example)
A lithium ion battery was produced in the same manner as in Example 2 except that the structure of the liquid injection hole and the sealing plug was changed. As shown in FIG. 4, the diameter 2 of the flange portion 11 is formed in the liquid injection hole 7 having a diameter of 2.0 mm and a depth of 0.5 mm of the stepped portion 21 and a through hole having a diameter of 0.5 mm in the center. A sealing plug 1 having a thickness of 0 mm and a thickness of 0.5 mm was pressed into the liquid injection hole 7 and laser welding was performed. About 500 produced lithium ion batteries, when the sealing defect after laser welding was confirmed, the welding defect by three pinholes generate | occur | produced.

本発明の密閉型電池の説明図、図１（ａ）は密閉型電池を説明する斜視図、図１（ｂ）は密閉型電池の平面図、図１（ｃ）は図１（ｂ）の電解液注液孔部分をＡ−Ａ線で切断した断面図、図１（ｄ）は図１（ｃ）の注液孔の封止工程を説明する断面図、図１（ｅ）はＯリングの斜視図。FIG. 1 (a) is a perspective view for explaining a sealed battery, FIG. 1 (b) is a plan view of the sealed battery, and FIG. 1 (c) is a diagram of FIG. 1 (b). FIG. 1D is a cross-sectional view of the electrolytic solution injection hole section cut along the line AA, FIG. 1D is a cross-sectional view illustrating the injection hole sealing process of FIG. 1C, and FIG. FIG. 本発明の密閉型電池の他の電解液注液孔の説明図、図２（ａ）は注液孔の封止工程を説明する断面図、図２（ｂ）は注液孔の封止後の断面図。FIG. 2A is a cross-sectional view illustrating a sealing step for the injection hole, and FIG. 2B is a view after sealing the injection hole. FIG. 本発明の密閉型電池の電解液注液孔の説明図、図３（ａ）は注液孔の封止工程を説明する断面図であり、図３（ｂ）は注液孔の封止後の断面図。FIG. 3A is an explanatory view of an electrolyte injection hole of the sealed battery of the present invention, FIG. 3A is a cross-sectional view illustrating a sealing process of the injection hole, and FIG. 3B is a view after sealing the injection hole FIG. 従来の密閉型電池の注液孔封止工程の説明図、図４（ａ）は封止栓の平面図、図４（ｂ）は封止栓を注液孔に挿入する前の状態の説明図、図４（ｃ）は封止栓を注液孔に挿入し溶接した状態の説明図。FIG. 4A is a plan view of a sealing plug, and FIG. 4B is a diagram illustrating a state before the sealing plug is inserted into the injection hole. FIG. 4 (c) is an explanatory view showing a state in which the sealing plug is inserted into the injection hole and welded.

符号の説明Explanation of symbols

１ 封止栓
１１ フランジ部
１２ （フランジ部）凹部
１３ （フランジ部）凸部
２ 蓋体
２１ 段部
２２ （段部）凹部
２３ （段部）凸部
３ レーザー溶接部
４ Ｏリング
５ 電池缶
６ 電極端子
７ 注液孔
８ 潰れ部 DESCRIPTION OF SYMBOLS 1 Sealing plug 11 Flange part 12 (Flange part) Concave part 13 (Flange part) Convex part 2 Lid body 21 Step part 22 (Step part) Concave part 23 (Step part) Convex part 3 Laser welding part 4 O-ring 5 Battery can 6 Electrode terminal 7 Injection hole 8 Collapsed part

Claims (2)

アルミニウムもしくはアルミニウム合金からなる電池缶、または前記電池缶の開口部を封口する蓋体に設けられた段部を備えた電解液注液孔に、フランジ部を備えた封止栓を装着し、溶接封止する密閉型電池において、前記注液孔の段部および前記封止栓のフランジ部に互いに対向する同心円状の凹部を設け、前記凹部が装着時に潰れ部を形成するように前記凹部に金属製Ｏリングを配したことを特徴とする密閉型電池。   A battery cap made of aluminum or an aluminum alloy, or a sealing plug provided with a flange is attached to an electrolyte solution injection hole provided with a step provided on a lid for sealing the opening of the battery can, and welded. In the sealed battery to be sealed, concentric recesses facing each other are provided in the step portion of the liquid injection hole and the flange portion of the sealing plug, and the recess is formed with a metal so that it forms a collapsed portion when mounted. A sealed battery characterized by having an O-ring made. アルミニウム合金からなる電池缶あるいは前記電池缶開口部を封口する蓋体に設けられ段部を備えた電解液注液孔に、フランジ部を備えた封止栓を装着し、溶接封止する密閉型電池において、前記注液孔の段部あるいは前記封止栓のフランジ部の一方に同心円状に凹部を有し、他方に前記凹部と対向する凸部を有し、前記凹部または前記凸部の少なくとも一方が装着時に潰れ部を形成したことを特徴とする密閉型電池。   A battery can made of an aluminum alloy or a sealed type in which a sealing plug provided with a flange portion is attached to an electrolyte injection hole provided with a step portion provided on a lid for sealing the opening portion of the battery can and sealed by welding. In the battery, one of the step portion of the liquid injection hole or the flange portion of the sealing plug has a concentric concave portion, the other has a convex portion facing the concave portion, and at least the concave portion or the convex portion. A sealed battery characterized in that one of them forms a crushed portion when mounted.
JP2005200320A 2005-07-08 2005-07-08 Sealed battery Pending JP2007018915A (en)

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CN117855774A (en) * 2024-03-07 2024-04-09 蜂巢能源科技股份有限公司 Sealing structure and battery
CN117855774B (en) * 2024-03-07 2024-05-24 蜂巢能源科技股份有限公司 Sealing structure and battery

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