JP4375660B2 - Sealed battery - Google Patents

Sealed battery Download PDF

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JP4375660B2
JP4375660B2 JP2003285147A JP2003285147A JP4375660B2 JP 4375660 B2 JP4375660 B2 JP 4375660B2 JP 2003285147 A JP2003285147 A JP 2003285147A JP 2003285147 A JP2003285147 A JP 2003285147A JP 4375660 B2 JP4375660 B2 JP 4375660B2
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lid
terminal
output terminal
insulating packing
mounting hole
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JP2005056649A (en
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博和 吉川
佳明 泉
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Hitachi Maxell Energy Ltd
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Hitachi Maxell Energy Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Sealing Battery Cases Or Jackets (AREA)

Description

本発明は、メーターの電源やバックアップ用の電源などに用いられるリチウム電池やリチウムイオン二次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 battery or a lithium ion secondary battery used for a power source for a meter or a power source for backup.

密閉型電池では、電池ケースの上面開口を塞ぐ蓋に、端子取付孔が貫通状に設けられており、この端子取付孔に正極端子（出力端子）が取り付けられている。正極端子は、外径が端子取付孔の内径よりも小さい軸部と、軸部の上端側にあって外径が端子取付孔の内径よりも大きな頭部とを有し、絶縁パッキングを介して端子取付孔に抜け外れ不能にかしめ固定している。この絶縁パッキングで正極端子と蓋との間がシールされて気密・液密状態に保たれるとともに電気的に絶縁される。   In a sealed battery, a terminal attachment hole is provided in a penetrating manner in a lid that closes the upper surface opening of the battery case, and a positive terminal (output terminal) is attached to the terminal attachment hole. The positive terminal has a shaft portion whose outer diameter is smaller than the inner diameter of the terminal mounting hole and a head portion on the upper end side of the shaft portion and whose outer diameter is larger than the inner diameter of the terminal mounting hole. It is crimped and fixed in the terminal mounting hole so that it cannot be removed. With this insulating packing, the positive electrode terminal and the lid are sealed to be kept in an airtight / liquidtight state and electrically insulated.

この種の絶縁パッキングとしては、例えば図５に示すごとく、正極端子１１の頭部１６と蓋７とで挟持されるフランジ部２８と、蓋７に設けた端子取付孔１３に内嵌する筒部２９とを有し、筒部２９に挿通孔３０を上下貫通状に設けた構成が考えられる。これによれば、筒部２９の挿通孔３０に正極端子１１の軸部１７を挿通し、これらを端子取付孔１３に取り付けた状態で、軸部１７の下端部を外側に折り曲げてかしめたときに、当該軸部１７が膨張変形して絶縁パッキング９の挿通孔３０に密着することにより、軸部１７と絶縁パッキング９との間がシールされる。同時に、軸部１７に外嵌する絶縁パッキング９の筒部２９が膨張変形して、端子取付孔１３の周辺部に密着することにより、絶縁パッキング９と蓋７との間がシールされる。   As this type of insulation packing, for example, as shown in FIG. 5, a flange portion 28 sandwiched between the head portion 16 of the positive electrode terminal 11 and the lid 7, and a cylindrical portion that fits in the terminal mounting hole 13 provided in the lid 7. 29, and a configuration in which the insertion hole 30 is provided in the cylindrical portion 29 in a vertically penetrating manner is conceivable. According to this, when the shaft portion 17 of the positive electrode terminal 11 is inserted into the insertion hole 30 of the cylindrical portion 29 and attached to the terminal mounting hole 13, the lower end portion of the shaft portion 17 is bent outward and caulked. Further, the shaft portion 17 expands and deforms and comes into close contact with the insertion hole 30 of the insulating packing 9, so that the space between the shaft portion 17 and the insulating packing 9 is sealed. At the same time, the cylindrical portion 29 of the insulating packing 9 fitted around the shaft portion 17 expands and deforms and comes into close contact with the peripheral portion of the terminal mounting hole 13, thereby sealing between the insulating packing 9 and the lid 7.

かかる密閉型電池では、機器に取り付ける際に正極端子１１の頭部１６に外部リード板を溶接する場合が多い。図５の構造では、振動などが外部リード板を介して正極端子１１に伝わり、正極端子１１が絶縁パッキング９に対して廻るおそれがある。この際の正極端子１１との摩擦で絶縁パッキング９が削れ、正極端子１１の軸部１７と絶縁パッキング９との間のシール性が維持されないおそれがある。   In such a sealed battery, an external lead plate is often welded to the head 16 of the positive electrode terminal 11 when being attached to a device. In the structure of FIG. 5, vibration or the like is transmitted to the positive electrode terminal 11 through the external lead plate, and the positive electrode terminal 11 may turn around the insulating packing 9. At this time, the insulating packing 9 is scraped by friction with the positive electrode terminal 11, and the sealing performance between the shaft portion 17 of the positive electrode terminal 11 and the insulating packing 9 may not be maintained.

この点に関し、特許文献１では、蓄電池の蓋に設けた突起を端子付きブッシングに設けた凹部に嵌着して、端子付きブッシングの廻り止めを図っており、この技術を図５の密閉型電池に適用することは可能である。   With respect to this point, in Patent Document 1, a protrusion provided on the lid of the storage battery is fitted into a recess provided on the bushing with a terminal to prevent rotation of the bushing with a terminal. It is possible to apply to.

特開昭５９−１４１１６３号公報（第２頁左下欄、第１−４図）JP 59-141163 (page 2, lower left column, Fig. 1-4)

特許文献１の廻り止め機構では、蓋の突起とブッシングの凹部との位置合わせが必要であり、この位置合わせを正確に行なって蓋の突起を端子付きブッシングの凹部に嵌着させないと、端子付きブッシングが廻ってしまうところに問題がある。   In the detent mechanism of Patent Document 1, it is necessary to align the projection of the lid with the recess of the bushing. If this alignment is performed accurately and the projection of the lid does not fit into the recess of the bushing with a terminal, the terminal is attached. There is a problem where the bushing turns around.

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、電池ケース１の上面開口を塞ぐ蓋７と、蓋７に貫通状に設けられた端子取付孔１３と、端子取付孔１３に絶縁パッキング９を介して嵌合された出力端子１１とを有する。出力端子１１は、外径が端子取付孔１３の内径よりも大きな頭部１６と、頭部１６の下面から下向きに突設され、かつ外径が端子取付孔１３の内径よりも小さな軸部１７とを有する。絶縁パッキング９は、出力端子１１の頭部１６と蓋７とで挟まれるフランジ部２８と、端子取付孔１３に出力端子１１の軸部１７が挿通した状態で端子取付孔１３に内嵌する筒部２９とを有する。そして、出力端子１１の軸部１７をかしめることにより、出力端子１１の頭部１６が絶縁パッキング９のフランジ部２８に押し付けられるようになっている。   As shown in FIGS. 1 and 2, the sealed battery according to the present invention includes a lid 7 that closes the upper surface opening of the battery case 1, a terminal mounting hole 13 that is provided in a penetrating manner in the lid 7, and a terminal mounting hole 13. And an output terminal 11 fitted through the insulating packing 9. The output terminal 11 has a head portion 16 having an outer diameter larger than the inner diameter of the terminal mounting hole 13 and a shaft portion 17 projecting downward from the lower surface of the head portion 16 and having an outer diameter smaller than the inner diameter of the terminal mounting hole 13. And have. The insulating packing 9 includes a flange portion 28 sandwiched between the head portion 16 of the output terminal 11 and the lid 7, and a cylinder that fits in the terminal mounting hole 13 in a state where the shaft portion 17 of the output terminal 11 is inserted into the terminal mounting hole 13. Part 29. The head portion 16 of the output terminal 11 is pressed against the flange portion 28 of the insulating packing 9 by caulking the shaft portion 17 of the output terminal 11.

本発明は、かかる密閉型電池において、出力端子１１の頭部１６の下面に端子側突起２６が下向きに突設されており、蓋７の上面であって絶縁パッキング９のフランジ部２８が接する箇所に、蓋側突起３３が上向きに突設されている。かくして、出力端子１１の頭部１６による絶縁パッキング９のフランジ部２８側への押圧力で、端子側突起２６が絶縁パッキング９のフランジ部２８の上面に食い込み、蓋側突起３３が絶縁パッキング９のフランジ部２８の下面に食い込むようにしたことを特徴とする。   In the sealed battery according to the present invention, a terminal-side protrusion 26 protrudes downward from the lower surface of the head portion 16 of the output terminal 11, and the flange portion 28 of the insulating packing 9 is in contact with the upper surface of the lid 7. In addition, a lid-side protrusion 33 protrudes upward. Thus, the terminal-side protrusion 26 bites into the upper surface of the flange portion 28 of the insulating packing 9 by the pressing force of the head 16 of the output terminal 11 toward the flange portion 28 side, and the lid-side protrusion 33 of the insulating packing 9 It is characterized by biting into the lower surface of the flange portion 28.

ここでの出力端子１１の軸部１７のかしめ形式は、図５に示すごとく軸部１７の下端部を外側に折り曲げてかしめる場合と、図１に示すごとく軸部１７を圧縮して下拡がりのテーパー状にかしめる場合とを含む。絶縁パッキング９は、蓋７や出力端子１１よりも硬度の小さい素材を選択する。例えば蓋７や出力端子１１が金属で形成されるのに対し、絶縁パッキング９は合成樹脂で形成する。   The caulking form of the shaft portion 17 of the output terminal 11 here is the case where the lower end portion of the shaft portion 17 is bent outward as shown in FIG. 5, and the shaft portion 17 is compressed and expanded downward as shown in FIG. And caulking in a tapered shape. For the insulating packing 9, a material having a hardness lower than that of the lid 7 and the output terminal 11 is selected. For example, the lid 7 and the output terminal 11 are made of metal, whereas the insulating packing 9 is made of synthetic resin.

詳しくは、図１および図２に示すごとく蓋７の下側に、パッキング挿通孔３６を貫通形成した絶縁板１０と、軸挿通孔３７を貫通形成した押さえ板１２とが順に配置されている。パッキング挿通孔３６には、出力端子１１の軸部１７を挿通した絶縁パッキング９の筒部２９の下端部が内嵌する。軸挿通孔３７には、絶縁パッキング９の筒部２９から突出した出力端子１１の軸部１７の下端部が内嵌する。そして、出力端子１１の軸部１７をかしめることにより、出力端子１１の軸部１７によって押さえ板１２が絶縁板１０を介して蓋７側に押し付けられている。   Specifically, as shown in FIGS. 1 and 2, an insulating plate 10 that has a packing insertion hole 36 formed therethrough and a presser plate 12 that has a shaft insertion hole 37 formed therethrough are sequentially arranged below the lid 7. In the packing insertion hole 36, the lower end portion of the cylindrical portion 29 of the insulating packing 9 through which the shaft portion 17 of the output terminal 11 is inserted is fitted. The lower end portion of the shaft portion 17 of the output terminal 11 protruding from the tube portion 29 of the insulating packing 9 is fitted into the shaft insertion hole 37. Then, by pressing the shaft portion 17 of the output terminal 11, the pressing plate 12 is pressed against the lid 7 side by the shaft portion 17 of the output terminal 11 through the insulating plate 10.

蓋側突起３３は、端子取付孔１３の周方向に等間隔で複数個設けられており、端子側突起２６は、出力端子１１の軸部１７の外周りに等間隔で複数個設けられており、出力端子１１を絶縁パッキング９を介して端子取付孔１３に嵌合した状態で、端子側突起２６と蓋側突起３３とが、上下に重ならないように端子取付孔１３の径方向に位置をずらして配されている。   A plurality of lid-side protrusions 33 are provided at equal intervals in the circumferential direction of the terminal mounting hole 13, and a plurality of terminal-side protrusions 26 are provided at equal intervals around the outer periphery of the shaft portion 17 of the output terminal 11. In a state where the output terminal 11 is fitted into the terminal mounting hole 13 through the insulating packing 9, the terminal side protrusion 26 and the lid side protrusion 33 are positioned in the radial direction so that they do not overlap vertically. Staggered.

蓋７の上面において端子取付孔１３の開口周縁壁には、受座１４を凹み形成し、絶縁パッキング９のフランジ部２８の下部を蓋７の受座１４に嵌合して、受座１４において絶縁パッキング９のフランジ部２８の下面が接する箇所に蓋側突起３３を設けることができる。出力端子１１の軸部１７は、下拡がりのテーパー状にかしめてもよい。   A recess 14 is formed in the opening peripheral wall of the terminal mounting hole 13 on the upper surface of the lid 7, and the lower portion of the flange portion 28 of the insulating packing 9 is fitted to the seat 14 of the lid 7. The lid-side protrusion 33 can be provided at a location where the lower surface of the flange portion 28 of the insulating packing 9 contacts. The shaft portion 17 of the output terminal 11 may be caulked in a downwardly expanding taper shape.

本発明によれば、蓋７の蓋側突起３３が絶縁パッキング９に食い込むことによって、絶縁パッキング９が蓋７に対して廻り止めされ、さらに出力端子１１の端子側突起２６が絶縁パッキング９に食い込むことによって、出力端子１１が絶縁パッキング９に対して廻り止めされる。蓋７の蓋側突起３３に対する絶縁パッキング９の位置合わせや、絶縁パッキング９に対する出力端子１１の端子側突起２６の位置合わせを行なわなくても、前記廻り止めが容易かつ確実に行なえる。   According to the present invention, when the lid-side protrusion 33 of the lid 7 bites into the insulating packing 9, the insulating packing 9 is prevented from rotating with respect to the lid 7, and the terminal-side projection 26 of the output terminal 11 bites into the insulating packing 9. As a result, the output terminal 11 is prevented from rotating with respect to the insulating packing 9. Even if the insulating packing 9 is not aligned with the lid-side protrusion 33 of the lid 7 or the terminal-side protrusion 26 of the output terminal 11 is aligned with the insulating packing 9, the above-described detent can be easily and reliably performed.

従って、絶縁パッキング９が、蓋７の端子取付孔１３に対して廻って摩擦で削られることを確実に防止できる。出力端子１１が、絶縁パッキング９に対して廻って絶縁パッキング９が摩擦で削られることも確実に防止できる。この結果、絶縁パッキング９の気密・液密作用を長期間保持し、信頼性の高い密閉型電池を得ることができる。前記位置合わせが省略できる分だけ、電池の製造の手間と時間とを軽減できる。   Therefore, the insulating packing 9 can be reliably prevented from being scraped by friction around the terminal mounting hole 13 of the lid 7. It is possible to reliably prevent the output terminal 11 from turning around the insulating packing 9 and scraping the insulating packing 9 by friction. As a result, the airtight / liquid tight action of the insulating packing 9 can be maintained for a long time, and a highly reliable sealed battery can be obtained. The labor and time for manufacturing the battery can be reduced by the amount that the alignment can be omitted.

出力端子１１の軸部１７をかしめることで、出力端子１１の軸部１７で押さえ板１２を絶縁板１０を介して蓋７側に押し付けると、この押し付けに伴なう反作用で出力端子１１の頭部１６が絶縁パッキング９のフランジ部２８へしっかりと押し付けられ、蓋７に対する絶縁パッキング９および出力端子１１の廻り止めを確実に行なうことができる。   By caulking the shaft portion 17 of the output terminal 11, when the pressing plate 12 is pressed against the lid 7 via the insulating plate 10 by the shaft portion 17 of the output terminal 11, the reaction of the output terminal 11 is caused by a reaction accompanying this pressing. The head 16 is firmly pressed against the flange portion 28 of the insulating packing 9, so that the insulating packing 9 and the output terminal 11 can be reliably prevented from rotating with respect to the lid 7.

端子側突起２６と蓋側突起３３とは、これら両者が上下に重ならないように端子取付孔１３の径方向に位置をずらして配してあると、端子側突起２６と蓋側突起３３との干渉で絶縁パッキング９のフランジ部２８に穴があくことを防止でき、この穴による絶縁パッキング９の気密・液密作用の低下を確実に防止できる。   If the terminal-side protrusion 26 and the lid-side protrusion 33 are arranged with their positions shifted in the radial direction of the terminal mounting hole 13 so that they do not overlap each other, the terminal-side protrusion 26 and the lid-side protrusion 33 It is possible to prevent the flange portion 28 of the insulating packing 9 from having a hole due to the interference, and it is possible to reliably prevent the airtight / liquid-tight action of the insulating packing 9 from being lowered by the hole.

絶縁パッキング９のフランジ部２８の下部が、蓋７側の受座１４に嵌合していると、絶縁パッキング９のフランジ部２８が蓋７の上側へ突出するのを抑え、この分だけ電池全体の上下方向の長さ寸法を小さくできる。   When the lower portion of the flange portion 28 of the insulating packing 9 is fitted to the seat 14 on the lid 7 side, the flange portion 28 of the insulating packing 9 is prevented from protruding upward from the lid 7, and the battery as much as this amount. The length dimension in the vertical direction can be reduced.

図１ないし図４は、本発明が対象とする密閉型電池を示しており、図２に示すごとく、上面が開口する有底円筒形状の電池ケース１と、電池ケース１内に装填される電極体および非水電解液と、電池ケース１の上面開口を塞ぐ封口構造などを有している。電池ケース１は、ステンレス鋼板あるいは鉄にニッケルメッキした鋼板を深絞り加工して形成されており、負極側の出力端子を兼ねている。   1 to 4 show a sealed battery as an object of the present invention. As shown in FIG. 2, a bottomed cylindrical battery case 1 having an open top surface and electrodes loaded in the battery case 1 are shown. The body and the non-aqueous electrolyte, and a sealing structure that closes the upper surface opening of the battery case 1 are included. The battery case 1 is formed by deep drawing a stainless steel plate or a steel plate nickel-plated on iron, and also serves as an output terminal on the negative electrode side.

電極体は、二酸化マンガンを活物質とするシート状の正極２と、リチウム箔からなる負極３とを、微孔性ポリエチレンフィルムからなるセパレータ４を間にして渦巻状に巻回してある。正極２および負極３からは、導電タブ５・６が上向きにそれぞれ導出されている。負極３は、外周面がセパレータ４で被覆されており、ニッケル集電体を介して電池ケース１の内面に溶接されている。   In the electrode body, a sheet-like positive electrode 2 using manganese dioxide as an active material and a negative electrode 3 made of lithium foil are spirally wound with a separator 4 made of a microporous polyethylene film interposed therebetween. Conductive tabs 5 and 6 are led out from the positive electrode 2 and the negative electrode 3, respectively. The negative electrode 3 has an outer peripheral surface covered with a separator 4 and is welded to the inner surface of the battery case 1 via a nickel current collector.

非水電解液としては、プロピレンカーボネイト（ＰＣ）と、１，２−ジメトキシエタン（ＤＭＥ）とを体積比１：１で混合した溶媒に、ＬｉＣＦ3 ＳＯ3 を0.５モル／リットルの割合で溶解した溶液を用いた。 As a non-aqueous electrolyte, LiCF 3 SO 3 was added at a ratio of 0.5 mol / liter to a solvent in which propylene carbonate (PC) and 1,2-dimethoxyethane (DME) were mixed at a volume ratio of 1: 1. A dissolved solution was used.

封口構造は、電池ケース１の上面開口を塞ぐ円板状の蓋７と、蓋７の内側に配置されるプラスチック製のインシュレータ８と、絶縁用の円環状の絶縁板１０と、蓋７に対して絶縁用の絶縁パッキング９および前記絶縁板１０を介してかしめ固定される正極側の出力端子（正極端子）１１と、正極端子１１でかしめ固定される円環状の金属製押さえ板１２とを含む。   The sealing structure includes a disc-shaped lid 7 that closes the upper surface opening of the battery case 1, a plastic insulator 8 disposed inside the lid 7, an annular insulating plate 10 for insulation, and the lid 7. And a positive output terminal (positive terminal) 11 that is caulked and fixed through the insulating packing 9 and the insulating plate 10, and an annular metal pressing plate 12 that is caulked and fixed with the positive terminal 11. .

蓋７は、ステンレス鋼板あるいは鉄にニッケルメッキした鋼板を素材にしたプレス成形品からなり、電池ケース１の開口周縁にレーザーでシール溶接してある。蓋７の中央には、図３に示すごとく、絶縁パッキング９および正極端子１１が通る円形の端子取付孔１３を貫通状に設けてある。蓋７の上面には、端子取付孔１３の開口周縁壁に受座１４が凹み形成されている。   The lid 7 is made of a press-formed product made of a stainless steel plate or a steel plate nickel-plated on steel, and is sealed and welded to the periphery of the opening of the battery case 1 with a laser. In the center of the lid 7, as shown in FIG. 3, a circular terminal mounting hole 13 through which the insulating packing 9 and the positive electrode terminal 11 pass is provided in a penetrating manner. On the upper surface of the lid 7, a receiving seat 14 is recessed in the opening peripheral wall of the terminal mounting hole 13.

正極端子１１は、円盤状の頭部１６と、頭部１６の下面中央から下向きに突設された円柱状の軸部１７と、軸部１７の下端面に上向きに形成された円錐状の凹み１８とを有するステンレス鋼板製の軸体からなる。その頭部１６の外径は端子取付孔１３の内径よりも大きく寸法設定されており、軸部１７の外径は端子取付孔１３の内径よりも小さく寸法設定されている。   The positive electrode terminal 11 includes a disk-shaped head portion 16, a columnar shaft portion 17 projecting downward from the center of the lower surface of the head portion 16, and a conical recess formed upward on the lower end surface of the shaft portion 17. 18 and a shaft body made of a stainless steel plate. The outer diameter of the head 16 is set to be larger than the inner diameter of the terminal mounting hole 13, and the outer diameter of the shaft portion 17 is set to be smaller than the inner diameter of the terminal mounting hole 13.

正極端子１１の頭部１６の下面には、断面円形の首部２２が突設されており、首部２２の下面中央に前記軸部１７が配されている。首部２２の外周面は、下すぼまりのテーパ状に形成されている。   A neck portion 22 having a circular cross section protrudes from the lower surface of the head portion 16 of the positive electrode terminal 11, and the shaft portion 17 is disposed at the center of the lower surface of the neck portion 22. The outer peripheral surface of the neck portion 22 is formed in a tapered shape having a downward concavity.

軸部１７の上端は、下すぼまり状のテーパ部２３を介して前記首部２２に接続されている。首部２２および軸部１７の上端側をテーパ状に形成したことで、絶縁パッキング９との密着性が高まる。頭部１６の下面外周寄りには、図４に示すごとく、ほぼ円柱形状の３個の小突起（端子側突起）２６が、正極端子１１の軸部１７の外周りに等間隔で下向きに突設されている。   The upper end of the shaft portion 17 is connected to the neck portion 22 via a tapered portion 23 having a lower conical shape. By forming the neck portion 22 and the upper end side of the shaft portion 17 in a tapered shape, the adhesion with the insulating packing 9 is enhanced. Near the outer periphery of the lower surface of the head 16, as shown in FIG. 4, three substantially cylindrical projections (terminal-side protrusions) 26 protrude downward at equal intervals around the outer periphery of the shaft portion 17 of the positive electrode terminal 11. It is installed.

絶縁パッキング９は、ポリプロピレンやポリフェニレンサルファイドなどの熱可塑性および絶縁性を有する合成樹脂からなり、図３に示すごとく、円環状のフランジ部２８と、フランジ部２８の中央から下向きに突設された円筒状の筒部２９とを有する。絶縁パッキング９のフランジ部２８の下部は、図１に示すごとく蓋７の受座１４に嵌合する。   The insulating packing 9 is made of a synthetic resin having thermoplasticity and insulation properties such as polypropylene and polyphenylene sulfide, and as shown in FIG. 3, an annular flange portion 28 and a cylinder projecting downward from the center of the flange portion 28. A cylindrical portion 29. The lower part of the flange portion 28 of the insulating packing 9 is fitted into the seat 14 of the lid 7 as shown in FIG.

絶縁パッキング９の筒部２９の中央に設けた挿通孔３０には、正極端子１１の軸部１７が挿通する。正極端子１１の軸部１７の下端部は、絶縁パッキング９の筒部２９の下側に突出する。図３において挿通孔３０の上端側は、下すぼまりのテーパ状に形成されており、挿通孔３０の下端側は下拡がりのテーパ状に形成されている。絶縁パッキング９の筒部２９の下端外周側には、下すぼまり状のテーパ部３１が形成されている。   The shaft portion 17 of the positive electrode terminal 11 is inserted into the insertion hole 30 provided in the center of the cylindrical portion 29 of the insulating packing 9. The lower end portion of the shaft portion 17 of the positive electrode terminal 11 protrudes below the cylindrical portion 29 of the insulating packing 9. In FIG. 3, the upper end side of the insertion hole 30 is formed in a tapered shape with a lower concavity, and the lower end side of the insertion hole 30 is formed in a tapered shape that expands downward. On the outer peripheral side of the lower end of the cylindrical portion 29 of the insulating packing 9, a downwardly tapered taper portion 31 is formed.

蓋７の受座１４において、絶縁パッキング９のフランジ部２８の下面が接する箇所での外周寄りには、図４に示すごとく、円錐状の３個の小突起（蓋側突起）３３が周方向に等間隔で上向きに突設されている。図１の組立状態で蓋７の小突起３３は、正極端子１１の小突起２６よりも端子取付孔１３の径方向の外側に位置ずれしており、蓋７の小突起３３と正極端子１１の小突起２６とが、上下に重ならないように配置してある。これにより、図１の組立状態で蓋７の小突起３３と正極端子１１の小突起２６とが干渉することを防ぐ。   In the seat 14 of the lid 7, three conical small projections (lid-side projections) 33 are arranged in the circumferential direction, as shown in FIG. 4, near the outer periphery where the lower surface of the flange portion 28 of the insulating packing 9 contacts. Are projected upward at equal intervals. In the assembled state of FIG. 1, the small protrusion 33 of the lid 7 is displaced from the small protrusion 26 of the positive terminal 11 in the radial direction of the terminal mounting hole 13. The small protrusions 26 are arranged so as not to overlap each other. This prevents the small protrusion 33 of the lid 7 and the small protrusion 26 of the positive terminal 11 from interfering with each other in the assembled state of FIG.

蓋７の上面の端子取付孔１３の開口周縁には、端子取付孔１３まわりに周回壁３４が突出形成されており、蓋７の下面には、端子取付孔１３の外周まわりに周回壁３５が突出形成されている。蓋７の上面の周回壁３４は、絶縁パッキング９のフランジ部２８の下面に食い込んで蓋７と絶縁パッキング９との密着性を高める。蓋７の下面の周回壁３５は、絶縁板１０の上面に食い込んで蓋７と絶縁板１０との密着性を高める。   A circumferential wall 34 is formed around the terminal mounting hole 13 at the opening periphery of the terminal mounting hole 13 on the upper surface of the lid 7, and a circumferential wall 35 is formed around the outer periphery of the terminal mounting hole 13 on the lower surface of the lid 7. Protrusions are formed. The circumferential wall 34 on the upper surface of the lid 7 bites into the lower surface of the flange portion 28 of the insulating packing 9 and improves the adhesion between the lid 7 and the insulating packing 9. The circumferential wall 35 on the lower surface of the lid 7 bites into the upper surface of the insulating plate 10 and improves the adhesion between the lid 7 and the insulating plate 10.

絶縁板１０は、絶縁パッキング９と同様に、ポリプロピレンやポリフェニレンサルファイドなどの熱可塑性、耐熱性および絶縁性を有する合成樹脂からなる。押さえ板１２は、ステンレス鋼板の金属板からなる。絶縁板１０としては、パッキング挿通孔３６を貫通形成した打ち抜き品を用いる。絶縁板１０は、蓋７の下面と押さえ板１２とで挟み込む。   The insulating plate 10 is made of a synthetic resin having thermoplasticity, heat resistance and insulating properties, such as polypropylene and polyphenylene sulfide, like the insulating packing 9. The pressing plate 12 is made of a stainless steel plate. As the insulating plate 10, a punched product that penetrates the packing insertion hole 36 is used. The insulating plate 10 is sandwiched between the lower surface of the lid 7 and the pressing plate 12.

絶縁パッキング９の挿通孔３０の直径寸法は、正極端子１１の軸部１７の外径寸法とほぼ同じか、それよりも僅かに小さい。絶縁パッキング９の筒部２９の外径寸法は、蓋７の端子取付孔１３の直径寸法とほぼ同じか、それよりも僅かに大きい。   The diameter dimension of the insertion hole 30 of the insulating packing 9 is substantially the same as or slightly smaller than the outer diameter dimension of the shaft portion 17 of the positive electrode terminal 11. The outer diameter dimension of the cylindrical portion 29 of the insulating packing 9 is substantially the same as or slightly larger than the diameter dimension of the terminal mounting hole 13 of the lid 7.

絶縁板１０のパッキング挿通孔３６の直径寸法は、蓋７の端子取付孔１３の内径寸法よりも大きく、かつ絶縁パッキング９のテーパ部３１の外径寸法よりも小さい。これにより、図１の組立状態で絶縁パッキング９のテーパ部３１が、絶縁板１０のパッキング挿通孔３６の内面に密着状に内嵌する。   The diameter of the packing insertion hole 36 of the insulating plate 10 is larger than the inner diameter of the terminal mounting hole 13 of the lid 7 and smaller than the outer diameter of the tapered portion 31 of the insulating packing 9. Thereby, in the assembled state of FIG. 1, the tapered portion 31 of the insulating packing 9 is fitted into the inner surface of the packing insertion hole 36 of the insulating plate 10 in close contact.

押さえ板１２としては、軸挿通孔３７を貫通形成した打ち抜き品を用いる。軸挿通孔３７の上端側は下すぼまりのテーパ状に形成されており、軸挿通孔３７の下端側は下拡がりのテーパ状に形成されている。   As the pressing plate 12, a punched product formed through the shaft insertion hole 37 is used. The upper end side of the shaft insertion hole 37 is formed in a taper shape with a lower concavity, and the lower end side of the shaft insertion hole 37 is formed in a taper shape that expands downward.

正極端子１１、絶縁パッキング９、絶縁板１０、押さえ板１２を図１に示す状態に組み立てた際に、正極端子１１の軸部１７の下端が押さえ板１２より下側に突出するように、正極端子１１の軸部１７の上下方向の長さ寸法が設定される。正極端子１１をかしめ固定することで、正極端子１１と絶縁パッキング９と絶縁板１０と押さえ板１２とが蓋７に一体化する。   The positive electrode terminal 11, the insulating packing 9, the insulating plate 10, and the holding plate 12 are assembled in the state shown in FIG. 1 so that the lower end of the shaft portion 17 of the positive electrode terminal 11 protrudes downward from the holding plate 12. The length dimension in the vertical direction of the shaft portion 17 of the terminal 11 is set. The positive terminal 11, the insulating packing 9, the insulating plate 10, and the holding plate 12 are integrated with the lid 7 by caulking and fixing the positive terminal 11.

具体的には、蓋７の下側に絶縁板１０と押さえ板１２とが順に配置され、絶縁パッキング９の筒部２９を蓋７の上面側から蓋７の端子取付孔１３に通してテーパ部３１を絶縁板１０のパッキング挿通孔３６に内嵌するとともに、正極端子１１の軸部１７を絶縁パッキング９の挿通孔３０に通す。この際、正極端子１１の軸部１７の下端が押さえ板１２の軸挿通孔３７を通って押さえ板１２の下側に突出する。   Specifically, the insulating plate 10 and the pressing plate 12 are arranged in this order on the lower side of the lid 7, and the cylindrical portion 29 of the insulating packing 9 is passed from the upper surface side of the lid 7 through the terminal mounting hole 13 of the lid 7 to be a tapered portion. 31 is fitted in the packing insertion hole 36 of the insulating plate 10, and the shaft portion 17 of the positive electrode terminal 11 is passed through the insertion hole 30 of the insulating packing 9. At this time, the lower end of the shaft portion 17 of the positive electrode terminal 11 protrudes through the shaft insertion hole 37 of the pressing plate 12 to the lower side of the pressing plate 12.

前記正極端子１１の頭部１６を冶具などで押さえて、正極端子１１の軸部１７を頭部１６側に圧縮することで、図１に示すごとく正極端子１１の軸部１７が下拡がりのテーパー状に拡径変形する。すると、正極端子１１の軸部１７が、絶縁パッキング９の筒部２９を介して蓋７の端子取付孔１３の内面側に押し付けられる。また、押さえ板１２の軸挿通孔３７を斜め上向きに押圧して、押さえ板１２が絶縁板１０を介して蓋７側に押し付けられる。なお、前記圧縮前においては、正極端子１１の軸部１７の外径が軸部１７の上端から下端にかけて同一寸法になっている。   By pressing the head portion 16 of the positive electrode terminal 11 with a jig or the like and compressing the shaft portion 17 of the positive electrode terminal 11 toward the head portion 16 side, the shaft portion 17 of the positive electrode terminal 11 tapers downward as shown in FIG. The diameter is expanded and deformed. Then, the shaft portion 17 of the positive electrode terminal 11 is pressed against the inner surface side of the terminal mounting hole 13 of the lid 7 through the cylindrical portion 29 of the insulating packing 9. Further, the shaft insertion hole 37 of the pressing plate 12 is pressed obliquely upward, and the pressing plate 12 is pressed against the lid 7 side through the insulating plate 10. Before the compression, the outer diameter of the shaft portion 17 of the positive electrode terminal 11 is the same from the upper end to the lower end of the shaft portion 17.

このようにすると、正極端子１１と蓋７の端子取付孔１３との間が絶縁パッキング９でしっかりとシールされた状態となるとともに、絶縁板１０が蓋７と押さえ板１２とで挟持されてこれらと密着し、蓋７と押さえ板１２との間がしっかりとシールされた状態となる。この状態で蓋７と、その端子取付孔１３に取り付けた正極端子１１との間が気密・液密状態に保たれるとともに電気的に絶縁される。   As a result, the space between the positive electrode terminal 11 and the terminal mounting hole 13 of the lid 7 is tightly sealed with the insulating packing 9, and the insulating plate 10 is sandwiched between the lid 7 and the pressing plate 12 and these are held. And the space between the lid 7 and the pressing plate 12 is tightly sealed. In this state, the lid 7 and the positive electrode terminal 11 attached to the terminal attachment hole 13 are kept in an airtight / liquid tight state and are electrically insulated.

蓋７の端子取付孔１３の周縁が、正極端子１１の頭部１６（直接的には絶縁パッキング９のフランジ部２８）と押さえ板１２（直接的には絶縁板１０）とで挟まれ、正極端子１１と絶縁パッキング９と絶縁板１０と押さえ板１２とが蓋７に一体化する。   The peripheral edge of the terminal mounting hole 13 of the lid 7 is sandwiched between the head 16 of the positive electrode terminal 11 (directly the flange portion 28 of the insulating packing 9) and the pressing plate 12 (directly the insulating plate 10). The terminal 11, the insulating packing 9, the insulating plate 10, and the pressing plate 12 are integrated with the lid 7.

正極端子１１の軸部１７をかしめたときには、押さえ板１２が蓋７側に押し付けられた際の押圧力の反作用で、正極端子１１の頭部１６が絶縁パッキング９のフランジ部２８に押し付けられて、図１に示すごとく、正極端子１１の頭部１６の各小突起２６が、絶縁パッキング９のフランジ部２８の上面に食い込む。さらに蓋７の各小突起３３が、絶縁パッキング９のフランジ部２８の下面に押し付けられて食い込む。   When the shaft portion 17 of the positive electrode terminal 11 is caulked, the head portion 16 of the positive electrode terminal 11 is pressed against the flange portion 28 of the insulating packing 9 by the reaction of the pressing force when the pressing plate 12 is pressed against the lid 7 side. As shown in FIG. 1, each small protrusion 26 of the head portion 16 of the positive electrode terminal 11 bites into the upper surface of the flange portion 28 of the insulating packing 9. Furthermore, each small protrusion 33 of the lid 7 is pressed against the lower surface of the flange portion 28 of the insulating packing 9 and bites.

蓋７の各小突起３３の食い込みによって絶縁パッキング９が蓋７に対して廻り止めされ、正極端子１１の各小突起２６が絶縁パッキング９に食い込むことによって正極端子１１が絶縁パッキング９を介して蓋７に廻り止めされる。   The insulating packing 9 is prevented from rotating with respect to the lid 7 by the biting of the small protrusions 33 of the lid 7, and the small terminal 26 of the positive electrode terminal 11 bites into the insulating packing 9, whereby the positive electrode terminal 11 is covered with the insulating packing 9. Stopped at 7.

従って、絶縁パッキング９が、蓋７の端子取付孔１３に対して廻って摩擦で削られることが防止され、同様に正極端子１１が絶縁パッキング９に対して廻って絶縁パッキング９が摩擦で削られることが防止される。   Therefore, the insulating packing 9 is prevented from being scraped by friction around the terminal mounting hole 13 of the lid 7, and similarly, the positive terminal 11 is rotated around the insulating packing 9 and the insulating packing 9 is scraped by friction. It is prevented.

なお、押さえ板１２は、前述のように金属製であるため、正極端子１１のかしめ時に軸部１７による押圧力が、押さえ板１２を介して絶縁板１０の下面のほぼ全体に加わり、当該絶縁板１０の上面全体が蓋７の内面（裏面）に密着した状態となる。正極端子１１の軸部１７の下端面には、先に述べた正極側の導電タブ５が溶接されている（図２）。   Since the pressing plate 12 is made of metal as described above, a pressing force by the shaft portion 17 is applied to almost the entire lower surface of the insulating plate 10 via the pressing plate 12 when the positive electrode terminal 11 is caulked. The entire upper surface of the plate 10 is in close contact with the inner surface (back surface) of the lid 7. The conductive tab 5 on the positive electrode side described above is welded to the lower end surface of the shaft portion 17 of the positive electrode terminal 11 (FIG. 2).

電池全体の組み立てに際しては、まず電池ケース１の内面に負極側の導電タブ６を溶接し、電池ケース１内にインシュレータ８を装着する。次いで、蓋７に正極端子１１などを一体的に組み付けてなる前記組立体において、正極端子１１の軸部１７の下端に正極側の導電タブ５を溶接する。   When assembling the entire battery, first, the conductive tab 6 on the negative electrode side is welded to the inner surface of the battery case 1, and the insulator 8 is mounted in the battery case 1. Next, in the assembly in which the positive electrode terminal 11 and the like are integrally assembled with the lid 7, the positive electrode side conductive tab 5 is welded to the lower end of the shaft portion 17 of the positive electrode terminal 11.

次に、電池ケース１内へ非水電解液を注入する。この後、蓋７を電池ケース１の上端に内嵌して、蓋７と電池ケース１との嵌合面をレーザー溶接してシールする。このとき、溶接熱の影響を受けやすい絶縁パッキング９には耐熱樹脂が使用されているので、溶接熱によって絶縁パッキング９が変形・変質したり溶融したりすることはない。これにより、電池が完成する。   Next, a non-aqueous electrolyte is injected into the battery case 1. Thereafter, the lid 7 is fitted into the upper end of the battery case 1 and the fitting surface between the lid 7 and the battery case 1 is laser welded and sealed. At this time, since the heat resistant resin is used for the insulating packing 9 which is easily affected by the welding heat, the insulating packing 9 is not deformed / deformed or melted by the welding heat. Thereby, the battery is completed.

なお、首部２２を省略して、頭部１６の下面に軸部１７を直接設けてもよい。出力端子１１は、図５と同様に軸部１７の下端部を外側に折り曲げてかしめてもよい。絶縁パッキング９や絶縁板１０は、絶縁性を有するゴムなどで形成してもよい。この場合、正極端子１１の各小突起２６や蓋７の各小突起３３は、絶縁パッキング９のフランジ部２８を弾性変形させて食い込むことになる。   The neck portion 22 may be omitted, and the shaft portion 17 may be provided directly on the lower surface of the head portion 16. The output terminal 11 may be crimped by bending the lower end portion of the shaft portion 17 outward as in FIG. The insulating packing 9 and the insulating plate 10 may be formed of rubber having an insulating property. In this case, each small protrusion 26 of the positive electrode terminal 11 and each small protrusion 33 of the lid 7 bite in by elastically deforming the flange portion 28 of the insulating packing 9.

本発明の密閉型電池の封口構造の要部を示す縦断面図The longitudinal cross-sectional view which shows the principal part of the sealing structure of the sealed battery of this invention 密閉型電池の全体の縦断面図Whole vertical section of sealed battery 封口構造の各部材の縦断面図Longitudinal sectional view of each member of the sealing structure 封口構造の要部の斜視図Perspective view of the main part of the sealing structure 課題を説明するための封口構造の縦断面図Longitudinal sectional view of the sealing structure for explaining the problem

符号の説明Explanation of symbols

１ 電池ケース
７ 蓋
９ 絶縁パッキング
１０ 絶縁板
１１ 正極端子（出力端子）
１２ 押さえ板
１３ 端子取付孔
１４ 受座
１６ 正極端子の頭部
１７ 正極端子の軸部
２６ 正極端子の小突起（端子側突起）
２８ 絶縁パッキングのフランジ部
２９ 絶縁パッキングの筒部
３３ 蓋の小突起（蓋側突起）
３６ 絶縁板のパッキング挿通孔
３７ 押さえ板の軸挿通孔 1 Battery Case 7 Lid 9 Insulating Packing 10 Insulating Plate 11 Positive Terminal (Output Terminal)
12 Presser plate 13 Terminal mounting hole 14 Receiving seat 16 Head portion of positive terminal 17 Shaft portion 26 of positive terminal Small protrusion (terminal side protrusion) of positive terminal
28 Insulating packing flange 29 Insulating packing cylinder 33 Small protrusion on the lid (cover side protrusion)
36 Insulating plate packing insertion hole 37 Holding plate shaft insertion hole

Claims (5)

電池ケースの上面開口を塞ぐ蓋と、前記蓋に貫通状に設けられた端子取付孔と、前記端子取付孔に絶縁パッキングを介して嵌合された出力端子とを有し、
前記出力端子は、外径が前記端子取付孔の内径よりも大きな頭部と、前記頭部の下面から下向きに突設され、かつ外径が前記端子取付孔の内径よりも小さな軸部とを有し、
前記絶縁パッキングが、前記出力端子の前記頭部と前記蓋とで挟まれるフランジ部と、前記端子取付孔に前記出力端子の前記軸部が挿通した状態で前記端子取付孔に内嵌する筒部とを有し、
前記出力端子の前記軸部をかしめることにより、前記出力端子の前記頭部が前記絶縁パッキングの前記フランジ部に押し付けられる密閉型電池において、
前記出力端子の前記頭部の下面に端子側突起が下向きに突設されており、
前記蓋の上面であって前記絶縁パッキングの前記フランジ部が接する箇所に、蓋側突起が上向きに突設されており、
前記出力端子の前記頭部による前記絶縁パッキングの前記フランジ部側への押圧力で、前記端子側突起が前記絶縁パッキングの前記フランジ部の上面に食い込むとともに、前記蓋側突起が前記絶縁パッキングの前記フランジ部の下面に食い込むようにしたことを特徴とする密閉型電池。 A lid that closes the upper surface opening of the battery case, a terminal mounting hole that is provided in a penetrating manner in the lid, and an output terminal that is fitted to the terminal mounting hole via an insulating packing;
The output terminal has a head portion having an outer diameter larger than the inner diameter of the terminal mounting hole, and a shaft portion projecting downward from the lower surface of the head portion and having an outer diameter smaller than the inner diameter of the terminal mounting hole. Have
The insulating packing includes a flange portion sandwiched between the head portion of the output terminal and the lid, and a cylindrical portion that fits into the terminal mounting hole in a state where the shaft portion of the output terminal is inserted into the terminal mounting hole. And
In the sealed battery in which the head portion of the output terminal is pressed against the flange portion of the insulating packing by caulking the shaft portion of the output terminal.
A terminal-side protrusion is provided on the lower surface of the head of the output terminal so as to protrude downward.
On the upper surface of the lid, a lid-side projection is provided so as to protrude upward at a location where the flange portion of the insulating packing contacts.
The terminal side protrusions bite into the upper surface of the flange part of the insulating packing by the pressing force of the output terminal toward the flange part side of the insulating packing, and the lid side protrusions A sealed battery characterized by biting into the lower surface of the flange portion. 前記蓋の下側に、パッキング挿通孔を貫通形成した絶縁板と、軸挿通孔を貫通形成した押さえ板とが順に配置されており、
前記パッキング挿通孔には、前記出力端子の前記軸部を挿通した前記絶縁パッキングの前記筒部の下端部が内嵌しており、
前記軸挿通孔には、前記絶縁パッキングの前記筒部から突出した前記出力端子の前記軸部の下端部が内嵌しており、
前記出力端子の前記軸部をかしめることにより、当該出力端子の前記軸部によって前記押さえ板が前記絶縁板を介して前記蓋側に押し付けられる請求項１記載の密閉型電池。 On the lower side of the lid, an insulating plate penetrating the packing insertion hole and a pressing plate penetrating the shaft insertion hole are sequentially arranged,
In the packing insertion hole, a lower end portion of the cylindrical portion of the insulating packing inserted through the shaft portion of the output terminal is internally fitted,
In the shaft insertion hole, a lower end portion of the shaft portion of the output terminal protruding from the tube portion of the insulating packing is internally fitted,
The sealed battery according to claim 1, wherein the pressing plate is pressed against the lid via the insulating plate by the shaft portion of the output terminal by caulking the shaft portion of the output terminal. 前記蓋側突起は、前記端子取付孔の周方向に等間隔で複数個設けられており、
前記端子側突起は、前記出力端子の前記軸部の外周りに等間隔で複数個設けられており、
前記出力端子を前記絶縁パッキングを介して前記端子取付孔に嵌合した状態で、前記端子側突起と前記蓋側突起とが、上下に重ならないように前記端子取付孔の径方向に位置をずらして配されている請求項２記載の密閉型電池。 A plurality of the lid-side protrusions are provided at equal intervals in the circumferential direction of the terminal mounting hole,
A plurality of the terminal side protrusions are provided at equal intervals around the shaft portion of the output terminal,
In a state where the output terminal is fitted into the terminal mounting hole via the insulating packing, the terminal mounting protrusion and the lid side protrusion are shifted in the radial direction so that they do not overlap vertically. The sealed battery according to claim 2, wherein the sealed battery is disposed. 前記蓋の上面において前記端子取付孔の開口周縁壁に受座を凹み形成して、前記絶縁パッキングの前記フランジ部の下部を前記蓋の前記受座に嵌合しており、
前記受座において前記絶縁パッキングの前記フランジ部の下面が接する箇所に前記蓋側突起を設けた請求項３記載の密閉型電池。 A recess is formed in the opening peripheral wall of the terminal mounting hole on the upper surface of the lid, and the lower portion of the flange portion of the insulating packing is fitted to the seat of the lid,
The sealed battery according to claim 3, wherein the lid-side protrusion is provided at a location where the lower surface of the flange portion of the insulating packing contacts the seat. 前記出力端子の前記軸部が、下拡がりのテーパー状にかしめられている請求項４記載の密閉型電池。   The sealed battery according to claim 4, wherein the shaft portion of the output terminal is caulked in a downwardly expanding taper shape.
JP2003285147A 2003-08-01 2003-08-01 Sealed battery Expired - Lifetime JP4375660B2 (en)

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