JP2009295418A - Manufacturing method of sealed battery - Google Patents

Manufacturing method of sealed battery Download PDF

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Publication number
JP2009295418A
JP2009295418A JP2008147798A JP2008147798A JP2009295418A JP 2009295418 A JP2009295418 A JP 2009295418A JP 2008147798 A JP2008147798 A JP 2008147798A JP 2008147798 A JP2008147798 A JP 2008147798A JP 2009295418 A JP2009295418 A JP 2009295418A
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output terminal
shaft portion
sealing plate
negative electrode
pressing plate
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JP2008147798A
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JP2009295418A5 (en
JP5495246B2 (en
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Hiroshi Maezono
寛志 前園
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Maxell Holdings Ltd
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Hitachi Maxell Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J15/00—Riveting
    • B21J15/02—Riveting procedures
    • B21J15/04—Riveting hollow rivets mechanically

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a manufacturing method of a sealed battery in which sealability between an output terminal and a sealing plate can be maintained highly. <P>SOLUTION: An axis part 23 of circular pillar shape of a negative electrode terminal 15 is inserted into a through-hole 14 of circular shape of a sealing plate 3 through an insulating packing 12 in between, and the axis part 23 of the negative electrode terminal 15 is inserted into the through-holes 32, 33 of an insulating material 13 and a pressing plate 16 at the lower side of the sealing plate 3. Then, the lower end portion 23c of the axis part 23 of the negative electrode terminal 15 protruding to the lower side of the pressing plate 16 is crushed vertically by a compression force in vertical direction so that the middle part from top and bottom may swell to the outside in diameter direction of the axis part 23, and the crushed lower end portion 23c of the axis part 23 of the negative electrode terminal 15 is made to overflow to the outside in diameter direction of the through-hole 33 of the pressing plate 16, and by this overflowed portion 37, the pressing plate 16 is pressed to the sealing plate 3 through the insulating material 13. Thereby, the negative electrode terminal 15, the insulating packing 12, the insulating material 13, and the pressing plate 16 are fixed to the sealing plate 3. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、電池缶の開口上面を塞ぐ封口板に形成した貫通孔に、出力端子の頭部の下面側に設けた軸部を絶縁パッキングを介在させた状態で挿通させるとともに、封口板の下側に絶縁材を介して押さえ板を配置し、その絶縁材と押さえ板との挿通孔に、出力端子の軸部を挿通させ、上下方向の圧縮力で出力端子をかしめることによって、出力端子と絶縁パッキングと絶縁材と押さえ板とを封口板に固定してなる密閉型電池の製造方法に関する。   The present invention allows a shaft provided on the lower surface side of the head of the output terminal to be inserted into a through hole formed in a sealing plate that closes the upper surface of the opening of the battery can with an insulating packing interposed therebetween, and below the sealing plate. An output terminal is arranged by placing a pressing plate on the side through an insulating material, inserting the shaft portion of the output terminal into the insertion hole between the insulating material and the pressing plate, and caulking the output terminal with a compressive force in the vertical direction. Further, the present invention relates to a method for manufacturing a sealed battery in which an insulating packing, an insulating material, and a pressing plate are fixed to a sealing plate.

前記密閉型電池としては、例えば特許文献１および２に示すものがあり、それらにあっては、例えば図７に示すようにして出力端子１５をかしめることになる。まず封口板３の貫通孔１４に、絶縁パッキング１２を介在させた状態で出力端子１５の軸部２３を挿通させ、該出力端子１５の軸部２３を絶縁材１３と押さえ板１６との挿通孔３２・３３に挿通させておく。なお、図７では実際のかしめ作業に合わせて天地を逆にしている。   Examples of the sealed battery include those shown in Patent Documents 1 and 2, and the output terminal 15 is caulked as shown in FIG. 7, for example. First, the shaft portion 23 of the output terminal 15 is inserted into the through hole 14 of the sealing plate 3 with the insulating packing 12 interposed, and the shaft portion 23 of the output terminal 15 is inserted into the insertion hole of the insulating material 13 and the holding plate 16. 32 and 33 are inserted. In FIG. 7, the top and bottom are reversed in accordance with the actual caulking work.

この状態で、出力端子１５に上下方向の圧縮力を加えるためのポンチ４０を下降させて、出力端子１５の下端面２３ａを下方に押すとともに、該ポンチ４０の山型の膨出部４０ａを、出力端子１５の下端面２３ａに凹入形成した凹部２５に係合させる。   In this state, the punch 40 for applying a compressive force in the vertical direction to the output terminal 15 is lowered to push the lower end surface 23a of the output terminal 15 downward, and the mountain-shaped bulging portion 40a of the punch 40 is The output terminal 15 is engaged with a recess 25 that is recessed in the lower end surface 23 a of the output terminal 15.

これにて、出力端子１５の下端部２３ｃにおいて、押さえ板１６の挿通孔３３の下側（図７では上側）に突出する部分４１が、挿通孔３３の径方向の外側に広がる。その広がった出力端子１５の突出部分４１と出力端子１５の頭部（不図示）とで、絶縁パッキング１２と押さえ板１６と絶縁材１３と封口板３とが挟み込まれて、出力端子１５と絶縁パッキング１２と押さえ板１６と絶縁材１３とが封口板３に固定される。   As a result, at the lower end portion 23 c of the output terminal 15, a portion 41 that protrudes below the insertion hole 33 (upper side in FIG. 7) of the holding plate 16 extends outward in the radial direction of the insertion hole 33. The insulating packing 12, the pressing plate 16, the insulating material 13, and the sealing plate 3 are sandwiched between the expanded projecting portion 41 of the output terminal 15 and the head portion (not shown) of the output terminal 15, thereby insulating the output terminal 15. The packing 12, the pressing plate 16, and the insulating material 13 are fixed to the sealing plate 3.

特開２００５−１２９４８８号公報（図１）Japanese Patent Laying-Open No. 2005-129488 (FIG. 1) 特開２００３−０４５４０７号公報（図１）JP 2003-045407 A (FIG. 1)

前記かしめ加工にあっては、出力端子１５の突出部分４１を径方向の外側に広げたときに、その突出部分４１の上側（図７では下側）となる出力端子１５の軸部２３部分が、出力端子１５の軸心方向に湾曲変形してしまう。このため、出力端子１５の軸部２３と押さえ板１６の挿通孔３３の内面との間、および出力端子１５と絶縁パッキング１２との間に隙間Ｓが生じ、これに伴って出力端子１５と絶縁パッキング１２との間での密封性が不十分になる。この結果、前記隙間Ｓを介して電池内の電解液が電池外に漏れ出すおそれがある。   In the caulking process, when the protruding portion 41 of the output terminal 15 is spread outward in the radial direction, the shaft portion 23 portion of the output terminal 15 which is the upper side (lower side in FIG. 7) of the protruding portion 41 is Then, it is bent and deformed in the axial direction of the output terminal 15. For this reason, a gap S is generated between the shaft portion 23 of the output terminal 15 and the inner surface of the insertion hole 33 of the pressing plate 16 and between the output terminal 15 and the insulating packing 12, and accordingly, the output terminal 15 is insulated from the output terminal 15. The sealing performance with the packing 12 is insufficient. As a result, the electrolyte in the battery may leak out of the battery through the gap S.

また、前記ポンチ４０にあっては、山型の膨出部４０ａを形成しなければならず、その分だけポンチ４０の形状が複雑になって、ポンチ４０の作製に手間と費用とが掛かることになる。   Further, in the punch 40, the mountain-shaped bulge portion 40a must be formed, and the shape of the punch 40 is complicated by that amount, and it takes time and money to manufacture the punch 40. become.

本発明は、以上のような密閉型電池の製造方法が抱える問題を解決するためになされたものであり、出力端子と封口板との間の密封性を高く維持できる密閉型電池の製造方法を提供することを目的とする。そのうえで、かしめ加工用のポンチを簡単な形状にできる密閉型電池の製造方法を提供することを目的とする。   The present invention has been made in order to solve the problems of the above-described method for manufacturing a sealed battery, and provides a method for manufacturing a sealed battery that can maintain high sealing performance between an output terminal and a sealing plate. The purpose is to provide. In addition, an object of the present invention is to provide a method for manufacturing a sealed battery in which a caulking punch can be formed into a simple shape.

本発明は、電池缶１の開口上面を塞ぐ封口板３に形成した円形の貫通孔１４に、出力端子１５の頭部２１の下面側に設けた円柱状の軸部２３を絶縁パッキング１２を介在させた状態で挿通させるとともに、封口板３の下側に絶縁材１３を介して押さえ板１６を配置し、その絶縁材１３と押さえ板１６との挿通孔３２・３３に、出力端子１５の軸部２３を挿通させ、上下方向の圧縮力で出力端子１５をかしめることによって、出力端子１５と絶縁パッキング１２と絶縁材１３と押さえ板１６とを封口板３に固定してなる密閉型電池の製造方法を対象とする。押さえ板１６の下側に出力端子１５の軸部２３の下端部２３ｃを突出させた状態で、上下方向の圧縮力で出力端子１５の軸部２３の下端部２３ｃを、その上下中間が該軸部２３の径方向の外側に膨れるように上下に押し潰して、該押し潰した出力端子１５の軸部２３の下端部２３ｃを、押さえ板１６の挿通孔３３の径方向の外側にはみ出させて、該はみ出し部分３７で押さえ板１６を絶縁材１３を介して封口板３に押し付けることで、絶縁パッキング１２と封口板３と絶縁材１３と押さえ板１６とが、出力端子１５のはみ出し部分３７と頭部２１とによって挟み込まれることを特徴とする。
ここでの出力端子１５は、負極端子の場合と正極端子の場合とが含まれる。 In the present invention, a cylindrical shaft portion 23 provided on the lower surface side of the head 21 of the output terminal 15 is interposed in an insulating packing 12 in a circular through hole 14 formed in the sealing plate 3 that closes the upper surface of the opening of the battery can 1. The presser plate 16 is disposed below the sealing plate 3 with the insulating material 13 interposed therebetween, and the shaft of the output terminal 15 is inserted into the insertion holes 32 and 33 between the insulating material 13 and the presser plate 16. A sealed battery formed by fixing the output terminal 15, the insulating packing 12, the insulating material 13, and the pressing plate 16 to the sealing plate 3 by inserting the portion 23 and caulking the output terminal 15 with a compressive force in the vertical direction. For manufacturing methods. With the lower end portion 23c of the shaft portion 23 of the output terminal 15 protruding below the presser plate 16, the lower end portion 23c of the shaft portion 23 of the output terminal 15 is compressed by the vertical compression force, and the upper and lower intermediate portions thereof are the shaft. The lower end portion 23c of the shaft portion 23 of the output terminal 15 is squeezed up and down so as to swell outward in the radial direction of the portion 23, and protrudes outward in the radial direction of the insertion hole 33 of the pressing plate 16 By pressing the pressing plate 16 against the sealing plate 3 through the insulating material 13 at the protruding portion 37, the insulating packing 12, the sealing plate 3, the insulating material 13, and the pressing plate 16 are connected to the protruding portion 37 of the output terminal 15. It is characterized by being sandwiched between the head 21.
The output terminal 15 here includes a case of a negative terminal and a case of a positive terminal.

かしめ前の自由状態で出力端子１５の軸部２３の下端面２３ａの中央に凹部２５が凹入形成されるとともに、出力端子１５の軸部２３の下端面２３ａの外周縁２３ｂが径方向に円弧状に湾曲しており、出力端子１５に上下方向の圧縮力を加えるポンチ３６は、出力端子１５の軸部２３の下端面２３ａに押し当たる押圧面３６ａが平面状に形成されており、ポンチ３６の押圧面３６ａが、かしめ前の自由状態の出力端子１５の軸部２３の下端面２３ａおよび該下端面２３ａの外周縁２３ｂに押し当たることで、下端面２３ａの外周縁２３ｂがポンチの３６の押圧面３６ａを滑るようにして出力端子１５の軸部２３の軸心側に押されて、出力端子１５の軸部２３の下端部２３ｃが上下に押し潰されるものとすることができる。   In a free state before caulking, a recess 25 is formed in the center of the lower end surface 23a of the shaft portion 23 of the output terminal 15, and an outer peripheral edge 23b of the lower end surface 23a of the shaft portion 23 of the output terminal 15 is circular in the radial direction. The punch 36 that is curved in an arc shape and applies a compressive force in the vertical direction to the output terminal 15 has a flat pressing surface 36 a that presses against the lower end surface 23 a of the shaft portion 23 of the output terminal 15. Is pressed against the lower end surface 23a of the shaft portion 23 of the output terminal 15 in the free state before caulking and the outer peripheral edge 23b of the lower end surface 23a, so that the outer peripheral edge 23b of the lower end surface 23a is The lower end portion 23c of the shaft portion 23 of the output terminal 15 may be crushed up and down by being pushed toward the shaft center side of the shaft portion 23 of the output terminal 15 so as to slide on the pressing surface 36a.

本発明に係る密閉型電池の製造方法においては、出力端子１５の軸部２３の下端部２３ｃの上下中間が軸部２３の径方向の外側に膨れるようにして、出力端子１５の軸部２３の下端部２３ｃが上下に押し潰されるので、その際には下端部２３ｃ以外の出力端子１５の軸部２３部分も、径方向の外側に膨れようとする。そして、出力端子１５の軸部２３が、押さえ板１６の挿通孔３３および絶縁材１３の挿通孔３２の内面側に強く押し付けられ、また絶縁パッキング１２を介して封口板３の貫通孔１４の内面に強く押し付けられる。   In the manufacturing method of the sealed battery according to the present invention, the upper and lower middles of the lower end portion 23c of the shaft portion 23 of the output terminal 15 swell outward in the radial direction of the shaft portion 23 so that the shaft portion 23 of the output terminal 15 Since the lower end part 23c is crushed up and down, the shaft part 23 part of the output terminal 15 other than the lower end part 23c also tends to bulge outward in the radial direction. The shaft portion 23 of the output terminal 15 is strongly pressed against the inner surface side of the insertion hole 33 of the pressing plate 16 and the insertion hole 32 of the insulating material 13, and the inner surface of the through hole 14 of the sealing plate 3 through the insulating packing 12. Strongly pressed against.

これによって、出力端子１５と封口板３の貫通孔１４との間の密封性が確実に得られ、また出力端子１５と押さえ板１６および絶縁材１３の挿通孔との間の密封性も得られる。これにて電池缶１内の電解液が、出力端子１５と封口板３の貫通孔１４との間等を通って電池外に漏れ出すことを確実に防止できる。   As a result, the sealing performance between the output terminal 15 and the through hole 14 of the sealing plate 3 can be reliably obtained, and the sealing performance between the output terminal 15 and the pressing plate 16 and the insertion hole of the insulating material 13 can also be obtained. . Thus, it is possible to reliably prevent the electrolyte in the battery can 1 from leaking out of the battery through the output terminal 15 and the through hole 14 of the sealing plate 3.

押さえ板１６の挿通孔３３の径方向の外側にはみ出した部分３７が、押さえ板１６を絶縁材１３を介して封口板３に押し付けるので、押さえ板１６および絶縁材１３は封口板３に確実に固定される。   The portion 37 that protrudes outward in the radial direction of the insertion hole 33 of the pressing plate 16 presses the pressing plate 16 against the sealing plate 3 through the insulating material 13, so that the pressing plate 16 and the insulating material 13 are reliably attached to the sealing plate 3. Fixed.

出力端子１５の軸部２３の下端面２３ａの中央に凹部２５が凹入形成されると、上下方向の圧縮力で出力端子１５の軸部２３の下端部２３ｃを容易に押し潰すことができる。そのうえで、出力端子１５に上下方向の圧縮力を加えるポンチ３６の押圧面３６ａが、平面状に形成されているので、その分だけポンチ３６の形状が単純化し、ポンチ３６の作製の手間と費用とを低減できる。出力端子１５の軸部２３の下端面２３ａの外周縁２３ｂが径方向に円弧状に湾曲しているので、その湾曲に沿って前記外周縁２３ｂが、ポンチの３６の押圧面３６ａを滑るようにして出力端子１５の軸部２３の軸心側に押される。これにて、出力端子１５の軸部２３の下端部２３ｃの上下中間を、確実に軸部２３の径方向の外側に膨れさせた状態で、その軸部２３の下端部２３ｃを押し潰すことができる。   When the concave portion 25 is formed in the center of the lower end surface 23a of the shaft portion 23 of the output terminal 15, the lower end portion 23c of the shaft portion 23 of the output terminal 15 can be easily crushed by the vertical compression force. In addition, since the pressing surface 36a of the punch 36 that applies a compressive force in the vertical direction to the output terminal 15 is formed in a flat shape, the shape of the punch 36 is simplified correspondingly, and the labor and cost of manufacturing the punch 36 are reduced. Can be reduced. Since the outer peripheral edge 23b of the lower end surface 23a of the shaft portion 23 of the output terminal 15 is curved in an arc shape in the radial direction, the outer peripheral edge 23b slides on the pressing surface 36a of the punch 36 along the curve. Then, the output terminal 15 is pushed toward the axial center side of the shaft portion 23. Thus, the lower end portion 23c of the shaft portion 23 can be crushed in a state where the upper and lower middle portions of the lower end portion 23c of the shaft portion 23 of the output terminal 15 are surely expanded outward in the radial direction of the shaft portion 23. it can.

本発明に係る密閉型電池は、図３に示すように、上面に左右横長の開口を有する有底筒形状の電池缶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封口板３と、封口板３の内側に配置される合成樹脂製の絶縁体５とを有する。電池缶１の左右幅寸法は３４ｍｍ、上下高さ寸法は４６ｍｍ、前後厚み寸法は４ｍｍである。電池缶１と封口板３とによって電池ケース６が形成される。   As shown in FIG. 3, the sealed battery according to the present invention includes a bottomed cylindrical battery can 1 having a horizontally long opening on an upper surface, an electrode body 2 accommodated in the battery can 1, and a nonaqueous electrolyte. And a horizontally long sealing plate 3 that closes and seals the upper surface of the opening of the battery can 1, and a synthetic resin insulator 5 disposed inside the sealing plate 3. The battery can 1 has a left-right width dimension of 34 mm, a vertical height dimension of 46 mm, and a front-rear thickness dimension of 4 mm. A battery case 6 is formed by the battery can 1 and the sealing plate 3.

電池缶１は、アルミニウムまたはその合金からなる板材を深絞り加工することで形成され、封口板３は、アルミニウム合金等の板材をプレス加工することで形成される。そして、封口板３が、レーザによって電池缶１の開口周縁にシーム溶接される。絶縁体５は、封口板３の下側に配置される。電極体２は、帯状の正極と帯状の負極とを帯状のセパレータを挟んで渦巻状に巻回してなり、全体が扁平状に形成される。   The battery can 1 is formed by deep drawing a plate made of aluminum or an alloy thereof, and the sealing plate 3 is formed by pressing a plate such as an aluminum alloy. Then, the sealing plate 3 is seam welded to the opening periphery of the battery can 1 by a laser. The insulator 5 is disposed on the lower side of the sealing plate 3. The electrode body 2 is formed by winding a strip-shaped positive electrode and a strip-shaped negative electrode in a spiral shape with a strip-shaped separator interposed therebetween, and is formed in a flat shape as a whole.

封口板３の左側には、開裂ベント９が形成される。開裂ベント９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。封口板３の右側には、電池ケース６内に非水電解液を注入するための注液孔１０が形成され、非水電解液の注入後の注液孔１０が、封止栓１１で塞がれてレーザによって封口される。   A cleavage vent 9 is formed on the left side of the sealing plate 3. The cleavage vent 9 is cleaved when the battery internal pressure abnormally rises to release the battery internal pressure. A liquid injection hole 10 for injecting a non-aqueous electrolyte into the battery case 6 is formed on the right side of the sealing plate 3, and the liquid injection hole 10 after the injection of the non-aqueous electrolyte is closed with a sealing plug 11. It is peeled off and sealed by laser.

封口板３の左右方向の中央には、図１および図２に示すように、上下貫通状に円形の貫通孔１４が形成されており、該貫通孔１４に、負極端子（出力端子）１５が絶縁パッキング１２を介在させた状態で挿通している。封口板３の下側には、絶縁材１３および押さえ板１６が上下に重ねて配置してある。押さえ板１６は、負極端子１５の下端部に接触することで負極端子１５と導通する。絶縁パッキング１２と絶縁材１３とは、ポリプロピレン等の絶縁性を有する合成樹脂成形品からなり、押さえ板１６は、左右横長のニッケル製の薄板からなる。そして、負極端子１５は、絶縁パッキング１２によって封口板３から絶縁される。   As shown in FIGS. 1 and 2, a circular through hole 14 is formed in a vertically penetrating manner at the center in the left-right direction of the sealing plate 3, and a negative electrode terminal (output terminal) 15 is provided in the through hole 14. The insulating packing 12 is inserted therethrough. On the lower side of the sealing plate 3, an insulating material 13 and a pressing plate 16 are arranged one above the other. The pressing plate 16 is electrically connected to the negative electrode terminal 15 by contacting the lower end portion of the negative electrode terminal 15. The insulating packing 12 and the insulating material 13 are made of a synthetic resin molded product having an insulating property such as polypropylene, and the pressing plate 16 is made of a nickel plate that is horizontally long. The negative electrode terminal 15 is insulated from the sealing plate 3 by the insulating packing 12.

絶縁材１３は、負極端子１５側から開裂ベント９側へ向けて伸びており、押さえ板１６は、封口板３に沿って負極端子１５側から開裂ベント９側へ向けて横方向に伸びている。つまり、絶縁材１３は、押さえ板１６と封口板３との間に介在し、絶縁材１３によって押さえ板１６が封口板３から絶縁される。負極端子１５を上下方向にかしめることで、負極端子１５と絶縁パッキング１２と絶縁材１３と押さえ板１６とが、封口板３に一体的に固定される。   The insulating material 13 extends from the negative electrode terminal 15 side toward the cleavage vent 9 side, and the pressing plate 16 extends in the lateral direction along the sealing plate 3 from the negative electrode terminal 15 side toward the cleavage vent 9 side. . That is, the insulating material 13 is interposed between the pressing plate 16 and the sealing plate 3, and the pressing plate 16 is insulated from the sealing plate 3 by the insulating material 13. The negative terminal 15, the insulating packing 12, the insulating material 13, and the pressing plate 16 are integrally fixed to the sealing plate 3 by caulking the negative terminal 15 in the vertical direction.

電極体２の負極には、図３に示す負極集電リード１８の下端が接続されており、負極集電リード１８の上端が押さえ板１６の下面に溶接される。電極体２の正極には、正極集電リード１９の下端が接続されており、正極集電リード１９の上端が、封口板３の下面において負極端子１５と注液孔１０との間のスペースに溶接される。これにて、負極端子１５が電極体２の負極と同電位になり、封口板３と電池缶１とが電極体２の正極と同電位になる。   The lower end of the negative electrode current collector lead 18 shown in FIG. 3 is connected to the negative electrode of the electrode body 2, and the upper end of the negative electrode current collector lead 18 is welded to the lower surface of the holding plate 16. The lower end of the positive electrode current collecting lead 19 is connected to the positive electrode of the electrode body 2, and the upper end of the positive electrode current collecting lead 19 is in the space between the negative electrode terminal 15 and the liquid injection hole 10 on the lower surface of the sealing plate 3. Welded. Thus, the negative electrode terminal 15 has the same potential as the negative electrode of the electrode body 2, and the sealing plate 3 and the battery can 1 have the same potential as the positive electrode of the electrode body 2.

負極端子１５は、図２および図４に示すように、絶縁パッキング１２の上面に露出する左右横長の扁平四角形状の頭部２１と、該頭部２１の下面中央で下方へ突出する段部２２と、該段部２２を介して頭部２１の下面側から下方に向けて延出する円柱状の軸部２３と、かしめ前の自由状態において該軸部２３の下端面２３ａの中央に凹入形成された円柱形状の凹部２５（図４）とを有する。負極端子１５は、表面に銅ニッケルメッキを施した鉄材等からなる。負極端子１５の軸部２３の下端面２３ａの外周縁２３ｂは、図４に示すように、径方向に円弧状に湾曲している。   As shown in FIGS. 2 and 4, the negative electrode terminal 15 includes a horizontally long flat rectangular head portion 21 exposed on the upper surface of the insulating packing 12, and a step portion 22 that protrudes downward at the center of the lower surface of the head portion 21. And a cylindrical shaft portion 23 extending downward from the lower surface side of the head portion 21 through the stepped portion 22, and a recess in the center of the lower end surface 23a of the shaft portion 23 in a free state before caulking. It has the cylindrical-shaped recessed part 25 (FIG. 4) formed. The negative electrode terminal 15 is made of an iron material or the like whose surface is plated with copper nickel. As shown in FIG. 4, the outer peripheral edge 23 b of the lower end surface 23 a of the shaft portion 23 of the negative electrode terminal 15 is curved in an arc shape in the radial direction.

凹部２５を形成したことによって周壁の厚みが薄くなった負極端子１５の軸部２３の下端部２３ｃは、負極端子１５と絶縁パッキング１２と絶縁材１３と押さえ板１６とを封口板３に組み付けたときに、図５に示すように押さえ板１６の外方（図５では上側）にほぼ位置するようになっている。   The lower end portion 23c of the shaft portion 23 of the negative electrode terminal 15 whose thickness of the peripheral wall is reduced by forming the concave portion 25 is obtained by assembling the negative electrode terminal 15, the insulating packing 12, the insulating material 13, and the pressing plate 16 to the sealing plate 3. At this time, as shown in FIG. 5, the presser plate 16 is positioned substantially outward (upper side in FIG. 5).

絶縁パッキング１２は、図２および図４に示すように、封口板３の上面中央に設けた凹み２６に受け止められる左右横長のフランジ部２７と、負極端子１５の軸部２３が挿通する挿通孔３０を設けた円筒状の筒部２８とを有する。絶縁パッキング１２のフランジ部２７の上面には、負極端子１５の頭部２１を受け止める受座２９を形成してある。絶縁パッキング１２の挿通孔３０の上部は、フランジ部２７の受座２９の中央まで伸びている。その挿通孔３０の上部の径は大きくなっていて、該挿通孔３０の上部に負極端子１５の段部２２が係合する（図２の状態）。封口板３の貫通孔１４は、凹み２６の下面中央に設けられる。   As shown in FIGS. 2 and 4, the insulating packing 12 includes a horizontally long flange portion 27 received by a recess 26 provided at the center of the upper surface of the sealing plate 3 and an insertion hole 30 through which the shaft portion 23 of the negative electrode terminal 15 is inserted. And a cylindrical tube portion 28 provided with the. A receiving seat 29 for receiving the head portion 21 of the negative electrode terminal 15 is formed on the upper surface of the flange portion 27 of the insulating packing 12. The upper portion of the insertion hole 30 of the insulating packing 12 extends to the center of the seat 29 of the flange portion 27. The diameter of the upper part of the insertion hole 30 is large, and the step part 22 of the negative electrode terminal 15 engages with the upper part of the insertion hole 30 (state of FIG. 2). The through hole 14 of the sealing plate 3 is provided at the center of the lower surface of the recess 26.

絶縁材１３には、負極端子１５の軸部２３および絶縁パッキング１２の筒部２８の下端部が挿通する円形の挿通孔３２が形成され、押さえ板１６には、負極端子１５の軸部２３が挿通する円形の挿通孔３３が形成される。   A circular insertion hole 32 through which the shaft portion 23 of the negative electrode terminal 15 and the lower end portion of the cylindrical portion 28 of the insulating packing 12 are inserted is formed in the insulating material 13, and the shaft portion 23 of the negative electrode terminal 15 is formed in the holding plate 16. A circular insertion hole 33 to be inserted is formed.

負極端子１５と絶縁パッキング１２と絶縁材１３と押さえ板１６とは、図５に示す負極端子１５を上下方向に圧縮するためのダイ３５およびポンチ３６を用いて、封口板３にかしめ固定される。すなわち、まず負極端子１５の天地を逆にして、負極端子１５の頭部２１をダイ３５の平面状の上面に載置する（図５の状態）。その状態で、負極端子１５の軸部２３を絶縁パッキング１２の挿通孔３０に挿通させるとともに、その絶縁パッキング１２の筒部２８を封口板３の貫通孔１４に挿通させる。   The negative electrode terminal 15, the insulating packing 12, the insulating material 13, and the pressing plate 16 are caulked and fixed to the sealing plate 3 using a die 35 and a punch 36 for compressing the negative electrode terminal 15 shown in FIG. . That is, first, the head of the negative electrode terminal 15 is placed on the flat upper surface of the die 35 with the top of the negative electrode terminal 15 reversed (state of FIG. 5). In this state, the shaft portion 23 of the negative electrode terminal 15 is inserted into the insertion hole 30 of the insulating packing 12, and the cylindrical portion 28 of the insulating packing 12 is inserted into the through hole 14 of the sealing plate 3.

次に、封口板３の外方（図５では上側）へ突出している絶縁パッキング１２の筒部２８および負極端子１５の軸部２３を、絶縁材１３の挿通孔３２に挿通させるとともに、その絶縁材１３の外方へ突出している負極端子１５の軸部２３を、押さえ板１６の挿通孔３３に挿通させる。このとき、負極端子１５の軸部２３の下端部２３ｃは、押さえ板１６の外方へ突出している。   Next, the cylindrical portion 28 of the insulating packing 12 and the shaft portion 23 of the negative electrode terminal 15 projecting outward (upward in FIG. 5) of the sealing plate 3 are inserted into the insertion hole 32 of the insulating material 13 and the insulation thereof is performed. The shaft portion 23 of the negative electrode terminal 15 protruding outward of the material 13 is inserted into the insertion hole 33 of the pressing plate 16. At this time, the lower end portion 23 c of the shaft portion 23 of the negative electrode terminal 15 protrudes outward of the pressing plate 16.

その状態でポンチ３６を下降させると、該ポンチ３６の平面状の押圧面３６ａが、負極端子１５の軸部２３の下端面２３ａ（図４参照）に当接する。このままポンチ３６を下降させることで、ポンチ３６の押圧面３６ａが、負極端子１５の軸部２３の下端の外周縁２３ｂにも押し当たり、その湾曲状の外周縁２３ｂが、ポンチ３６の押圧面３６ａを滑るようにして軸部２３の軸心側に押し込まれる。これにて、図６（ａ）に示すように、負極端子１５の軸部２３の下端部２３ｃは、その上下中間部が外側に膨れるように湾曲し、図６（ｂ）に示すように、その上下中間部で折れ曲がって上下に押し潰される。   When the punch 36 is lowered in this state, the flat pressing surface 36 a of the punch 36 comes into contact with the lower end surface 23 a (see FIG. 4) of the shaft portion 23 of the negative electrode terminal 15. By lowering the punch 36 as it is, the pressing surface 36 a of the punch 36 also presses against the outer peripheral edge 23 b at the lower end of the shaft portion 23 of the negative electrode terminal 15, and the curved outer peripheral edge 23 b becomes the pressing surface 36 a of the punch 36. Is pushed into the axial center side of the shaft portion 23. Thus, as shown in FIG. 6A, the lower end 23c of the shaft portion 23 of the negative electrode terminal 15 is curved so that the upper and lower intermediate portions swell outward, and as shown in FIG. It bends at the upper and lower middle part and is crushed up and down.

これによって、該押し潰された負極端子１５の下端部２３ｃが、図１および図２に示すように、押さえ板１６の挿通孔３３の下側において、該挿通孔３３の径方向の外側にはみ出し、該はみ出し部分３７で押さえ板１６を封口板３側に押し付ける。この結果、絶縁パッキング１２と封口板３と絶縁材１３と押さえ板１６とが、負極端子１５の前記はみ出し部分と頭部２１とによって挟み込まれて、負極端子１５と絶縁パッキング１２と絶縁材１３と押さえ板１６と封口板３とが一体化する。   As a result, the crushed lower end portion 23c of the negative electrode terminal 15 protrudes outwardly in the radial direction of the insertion hole 33 below the insertion hole 33 of the pressing plate 16, as shown in FIGS. The pressing plate 16 is pressed against the sealing plate 3 by the protruding portion 37. As a result, the insulating packing 12, the sealing plate 3, the insulating material 13, and the pressing plate 16 are sandwiched between the protruding portion of the negative electrode terminal 15 and the head 21, and the negative electrode terminal 15, the insulating packing 12, and the insulating material 13 are The pressing plate 16 and the sealing plate 3 are integrated.

また、ポンチ３６による上下方向の圧縮力によって、負極端子１５の軸部２３が上下方向に僅かに縮まる一方で径方向の外側へ僅かに膨れる。これにて軸部２３の外周側面が、絶縁パッキング１２の筒部２８を封口板３の貫通孔１４の内面側に押し、負極端子１５の軸部２３と絶縁パッキング１２の筒部２８と、および封口板３の貫通孔１４の内面と絶縁パッキング１２の筒部２８とが確りと密着する。つまり、負極端子１５の軸部２３と封口板３の貫通孔１４の内面との間が、絶縁パッキング１２によって確実に密封される。   Further, due to the compressive force in the vertical direction by the punch 36, the shaft portion 23 of the negative electrode terminal 15 is slightly contracted in the vertical direction while slightly expanding outward in the radial direction. Thus, the outer peripheral side surface of the shaft portion 23 pushes the cylindrical portion 28 of the insulating packing 12 toward the inner surface side of the through hole 14 of the sealing plate 3, and the shaft portion 23 of the negative electrode terminal 15, the cylindrical portion 28 of the insulating packing 12, and The inner surface of the through hole 14 of the sealing plate 3 and the cylindrical portion 28 of the insulating packing 12 are firmly attached. That is, the space between the shaft portion 23 of the negative electrode terminal 15 and the inner surface of the through hole 14 of the sealing plate 3 is reliably sealed by the insulating packing 12.

電池の組み立てに際しては、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、前述の負極端子１５と絶縁パッキング１２と絶縁板１３と押さえ板１６とをかしめ固定した封口板３に対して、電極体２の負極集電リード１８を押さえ板１６に、電極体２の正極集電リード１９を封口板３にそれぞれ溶接する。次いで、電池缶１の開口周縁に前記封口板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１０から非水電解液を注入する。   When assembling the battery, after the electrode body 2 and the insulator 5 are accommodated in the battery can 1, the sealing plate 3 in which the negative electrode terminal 15, the insulating packing 12, the insulating plate 13, and the pressing plate 16 are caulked and fixed is used. On the other hand, the negative electrode current collecting lead 18 of the electrode body 2 is welded to the holding plate 16, and the positive electrode current collecting lead 19 of the electrode body 2 is welded to the sealing plate 3. Next, after the sealing plate 3 is seam welded to the periphery of the opening of the battery can 1, the inside of the battery can 1 is vacuumed and the nonaqueous electrolyte is injected from the liquid injection hole 10.

非水電解液の注入完了後に、封止栓１１を注液孔１０に圧入し、封止栓１１を封口板３の注液孔１０の周縁部にレーザ溶接する（図３の状態）。これにて、注液孔１０が封止栓１１で密封され、本発明の密閉型電池が完成する。   After completion of the injection of the non-aqueous electrolyte, the sealing plug 11 is press-fitted into the liquid injection hole 10, and the sealing plug 11 is laser welded to the peripheral edge of the liquid injection hole 10 of the sealing plate 3 (state of FIG. 3). Thus, the liquid injection hole 10 is sealed with the sealing plug 11 to complete the sealed battery of the present invention.

このように、負極端子１５の軸部２３の下端部２３ｃの上下中間が軸部２３の径方向の外側に膨れるようにして、負極端子１５の軸部２３の下端部２３ｃが上下に押し潰されるので、その際には下端部２３ｃ以外の負極端子１５の軸部２３部分も、径方向の外側に膨れようとする。このため、負極端子１５の軸部２３が、押さえ板１６の挿通孔３３および絶縁材１３の挿通孔３２の内面側に強く押し付けられ、また絶縁パッキング１２を介して封口板３の貫通孔１４の内面に強く押し付けられる。   In this way, the lower end portion 23c of the shaft portion 23 of the negative electrode terminal 15 is squeezed up and down so that the middle of the lower end portion 23c of the shaft portion 23 of the negative electrode terminal 15 swells outward in the radial direction of the shaft portion 23. Therefore, in that case, the shaft portion 23 portion of the negative electrode terminal 15 other than the lower end portion 23c also tends to bulge outward in the radial direction. Therefore, the shaft portion 23 of the negative electrode terminal 15 is strongly pressed against the inner surface side of the insertion hole 33 of the holding plate 16 and the insertion hole 32 of the insulating material 13, and the through hole 14 of the sealing plate 3 is interposed via the insulating packing 12. Strongly pressed against the inner surface.

これによって、負極端子１５と封口板３の貫通孔１４との間の密封性が確実に得られ、また負極端子１５と押さえ板１６および絶縁材１３の挿通孔との間の密封性も得られる。これにて電池缶１内の電解液が、負極端子１５と封口板３の貫通孔１４との間等を通って電池外に漏れ出すことを確実に防止できる。   Thereby, the sealing performance between the negative electrode terminal 15 and the through hole 14 of the sealing plate 3 can be reliably obtained, and the sealing performance between the negative electrode terminal 15 and the pressing plate 16 and the insertion hole of the insulating material 13 can also be obtained. . As a result, it is possible to reliably prevent the electrolyte in the battery can 1 from leaking out of the battery through the space between the negative electrode terminal 15 and the through hole 14 of the sealing plate 3.

本発明に係る密閉型電池の要部の拡大断面図である。It is an expanded sectional view of an important section of a sealed type battery concerning the present invention. 図１のＡ−Ａ線断面図である。It is the sectional view on the AA line of FIG. 密閉型電池の縦断正面図である。It is a vertical front view of a sealed battery. 密閉型電池の要部の分解斜視図である。It is a disassembled perspective view of the principal part of a sealed battery. 負極端子のかしめ工程を示す縦断面図である。It is a longitudinal cross-sectional view which shows the crimping process of a negative electrode terminal. （ａ）は負極端子のかしめ工程の途中、（ｂ）は負極端子のかしめ工程の完了を示す縦断面図である。(A) is the longitudinal cross-sectional view which shows completion of the caulking process of a negative electrode terminal, (b) is completion of the caulking process of a negative electrode terminal. 従来の負極端子のかしめ工程を示す縦断面図である。It is a longitudinal cross-sectional view which shows the crimping process of the conventional negative electrode terminal.

符号の説明Explanation of symbols

１ 電池缶
３ 封口板
１２ 絶縁パッキング
１３ 絶縁材
１４ 貫通孔
１５ 負極端子
１６ 押さえ板
２１ 頭部
２３ 軸部
２３ａ 下端面
２３ｂ 外周縁
２３ｃ 下端部
２５ 凹部
３２・３３ 挿通孔
３６ ポンチ
３６ａ 押圧面
３７ はみ出し部分 DESCRIPTION OF SYMBOLS 1 Battery can 3 Sealing plate 12 Insulation packing 13 Insulation material 14 Through-hole 15 Negative electrode terminal 16 Holding plate 21 Head 23 Shaft part 23a Lower end surface 23b Outer peripheral edge 23c Lower end part 25 Recess 32 * 33 Insertion hole 36 Punch 36a Pressing surface 37 Extrusion portion

Claims (2)

電池缶の開口上面を塞ぐ封口板に形成した円形の貫通孔に、出力端子の頭部の下面側に設けた円柱状の軸部を絶縁パッキングを介在させた状態で挿通させるとともに、前記封口板の下側に絶縁材を介して押さえ板を配置し、その絶縁材と押さえ板との挿通孔に、前記出力端子の軸部を挿通させ、上下方向の圧縮力で前記出力端子をかしめることによって、前記出力端子と前記絶縁パッキングと前記絶縁材と前記押さえ板とを前記封口板に固定してなる密閉型電池の製造方法において、
前記押さえ板の下側に前記出力端子の軸部の下端部を突出させた状態で、前記上下方向の圧縮力で前記出力端子の軸部の下端部を、その上下中間が該軸部の径方向の外側に膨れるように上下に押し潰して、該押し潰した前記出力端子の軸部の下端部を、前記押さえ板の挿通孔の径方向の外側にはみ出させ、該はみ出し部分で前記押さえ板を前記絶縁材を介して前記封口板に押し付けることで、前記絶縁パッキングと前記封口板と前記絶縁材と前記押さえ板とが、前記出力端子の前記はみ出し部分と前記頭部とによって挟み込まれることを特徴とする密閉型電池の製造方法。 The cylindrical plate provided on the lower surface side of the head of the output terminal is inserted into the circular through hole formed in the sealing plate that closes the upper surface of the opening of the battery can with the insulating packing interposed therebetween, and the sealing plate A pressing plate is arranged on the lower side through an insulating material, and the shaft portion of the output terminal is inserted into the insertion hole between the insulating material and the pressing plate, and the output terminal is caulked with a compressive force in the vertical direction. In the manufacturing method of the sealed battery formed by fixing the output terminal, the insulating packing, the insulating material, and the pressing plate to the sealing plate,
With the lower end portion of the shaft portion of the output terminal protruding below the holding plate, the lower end portion of the shaft portion of the output terminal is compressed by the vertical compression force, and the middle of the shaft portion is the diameter of the shaft portion. Squeezed up and down so as to swell outward in the direction, the lower end portion of the squeezed shaft portion of the output terminal protrudes outward in the radial direction of the insertion hole of the pressing plate, and the pressing plate at the protruding portion Is pressed against the sealing plate through the insulating material, so that the insulating packing, the sealing plate, the insulating material, and the pressing plate are sandwiched between the protruding portion of the output terminal and the head. A method for producing a sealed battery, which is characterized. かしめ前の自由状態で前記出力端子の軸部の下端面の中央に凹部が凹入形成されるとともに、前記出力端子の軸部の下端面の外周縁が径方向に円弧状に湾曲しており、
前記出力端子に上下方向の圧縮力を加えるポンチは、前記出力端子の軸部の下端面に押し当たる押圧面が平面状に形成されており、前記ポンチの押圧面が、かしめ前の自由状態の前記出力端子の軸部の下端面および該下端面の外周縁に押し当たることで、前記下端面の外周縁が前記ポンチの押圧面を滑るようにして前記軸部の軸心側に押されて、前記出力端子の軸部の下端部が上下に押し潰される請求項１記載の密閉型電池の製造方法。 A concave portion is formed in the center of the lower end surface of the shaft portion of the output terminal in a free state before caulking, and the outer peripheral edge of the lower end surface of the shaft portion of the output terminal is curved in an arc shape in the radial direction. ,
The punch that applies a compressive force in the vertical direction to the output terminal has a flat pressing surface that presses against the lower end surface of the shaft portion of the output terminal, and the pressing surface of the punch is in a free state before caulking. By pressing against the lower end surface of the shaft portion of the output terminal and the outer peripheral edge of the lower end surface, the outer peripheral edge of the lower end surface is pushed toward the shaft center side of the shaft portion so as to slide on the pressing surface of the punch. The method for manufacturing a sealed battery according to claim 1, wherein a lower end portion of the shaft portion of the output terminal is crushed up and down.
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JP2015035304A (en) * 2013-08-08 2015-02-19 株式会社豊田自動織機 Terminal structure
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JP2011210473A (en) * 2010-03-29 2011-10-20 Gs Yuasa Corp Battery
JP2015035304A (en) * 2013-08-08 2015-02-19 株式会社豊田自動織機 Terminal structure
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US10964923B2 (en) 2017-05-31 2021-03-30 Sanyo Electric Co., Ltd. Prismatic secondary battery, and assembled battery and vehicle including the same

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