JP5213030B2 - Sealed battery manufacturing method and sealed battery - Google Patents

Sealed battery manufacturing method and sealed battery Download PDF

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JP5213030B2
JP5213030B2 JP2008108343A JP2008108343A JP5213030B2 JP 5213030 B2 JP5213030 B2 JP 5213030B2 JP 2008108343 A JP2008108343 A JP 2008108343A JP 2008108343 A JP2008108343 A JP 2008108343A JP 5213030 B2 JP5213030 B2 JP 5213030B2
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lead body
insulating material
lid
battery
output terminal
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JP2009259651A (en
JP2009259651A5 (en
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佳巳 松本
修 渡辺
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Hitachi Maxell Energy Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Description

本発明は、出力端子と蓋との間に絶縁パッキングを介在させた状態で、出力端子を蓋の貫通孔に挿通させ、蓋の下側に突出した出力端子の下端部に絶縁材と共にリード体を取り付け、リード体に電池缶内の電極体から延出する集電リードを接続する密閉型電池の製造方法および密閉型電池に関する。 The present invention provides a lead body together with an insulating material at a lower end portion of an output terminal that is inserted into a through-hole of the lid with an insulating packing interposed between the output terminal and the lid, and projecting to the lower side of the lid. The present invention relates to a sealed battery manufacturing method and a sealed battery in which a current collecting lead extending from an electrode body in a battery can is connected to the lead body.

前記密閉型電池としては、例えば特許文献1ないし3に示すものがある。特許文献1に記載の密閉型電池は、電池缶の開口を塞ぐ蓋に形成した貫通孔に、出力端子を絶縁パッキングを介在させた状態で挿通し、蓋の下側(特許文献1の図2では上側)に突出した出力端子の下端部にフィルム状の絶縁材と共にリード体を取り付け、該リード体に電池缶内の電極体から延出する集電リードを接続することで製造される。   Examples of the sealed battery include those shown in Patent Documents 1 to 3. In the sealed battery described in Patent Document 1, an output terminal is inserted into a through hole formed in a cover that closes the opening of the battery can with an insulating packing interposed therebetween, and the lower side of the cover (FIG. 2 of Patent Document 1). In this case, a lead body is attached to the lower end portion of the output terminal protruding upward) together with a film-like insulating material, and a current collecting lead extending from the electrode body in the battery can is connected to the lead body.

特許文献2に記載の密閉型電池でも、蓋の貫通孔に、出力端子を絶縁パッキングを介在させた状態で挿通し、蓋の下側に突出した出力端子の下端部に絶縁材と共にリード体を取り付け、該リード体に電池缶内の電極体の集電リードを接続することで製造される。特許文献3に記載の密閉型電池では、絶縁パッキングと絶縁材とを一体化した絶縁部材を介在させた状態で、出力端子を蓋の貫通孔に挿通し、蓋の下側に突出した出力端子の下端部に、電池缶内の電極体の集電リードに一体化したリード体を取り付けることで製造される。   Even in the sealed battery described in Patent Document 2, the output terminal is inserted into the through-hole of the lid with the insulating packing interposed, and the lead body together with the insulating material is placed at the lower end of the output terminal protruding below the lid. It is manufactured by attaching and connecting the current collecting lead of the electrode body in the battery can to the lead body. In the sealed battery described in Patent Document 3, the output terminal is inserted through the through-hole of the lid with the insulating member in which the insulating packing and the insulating material are integrated, and protrudes below the lid. The lead body integrated with the current collecting lead of the electrode body in the battery can is attached to the lower end portion of the battery can.

特開平8−250104号公報(図2)JP-A-8-250104 (FIG. 2) 特開平8−329911号公報(図3)JP-A-8-329911 (FIG. 3) 特開2002−164025号公報(図1−2)JP 2002-164025 A (FIG. 1-2)

特許文献1ないし3の密閉型電池では、いずれも絶縁材とリード体とが別々の部品として作製されている。このため、電池の製造に際しては、絶縁材とリード体とを別々の部品として取り扱う必要があり、かかる部品管理の手間等が煩わしいことになる。   In all of the sealed batteries of Patent Documents 1 to 3, the insulating material and the lead body are produced as separate parts. For this reason, when manufacturing the battery, it is necessary to handle the insulating material and the lead body as separate components, which makes it troublesome to manage such components.

また、特許文献1に記載の密閉型電池では、リード体が出力端子を軸に回転する可能性があり、この場合にはリード体が電池缶の内面に接触して短絡するおそれがある。これに対して、特許文献2に記載の密閉型電池では、絶縁材の縁に、リード体の回転を阻止するストッパーが設けられているが(特許文献2の図9参照)、該ストッパーを設けることに伴って絶縁材の幅(特許文献2の図9では上下方向の幅)が大きくなっている。この分だけ電池の薄型化が困難になる。   In the sealed battery described in Patent Document 1, there is a possibility that the lead body rotates around the output terminal, and in this case, the lead body may contact the inner surface of the battery can and short-circuit. On the other hand, in the sealed battery described in Patent Document 2, a stopper for preventing the rotation of the lead body is provided at the edge of the insulating material (see FIG. 9 of Patent Document 2), but the stopper is provided. Accordingly, the width of the insulating material (the vertical width in FIG. 9 of Patent Document 2) is increased. This makes it difficult to reduce the thickness of the battery.

特許文献3に記載の密閉型電池でも、該特許文献3の図2(c)に示すように絶縁材に設けた支持壁部の右端がリード体の前縁(特許文献3の図2(c)では下側)に当接している。これにてリード体の回転が阻止されるが、前記支持壁部でリード体を受け止めるためには、支持壁部に強度が必要であり、したがって支持壁部の前後幅をある程度大きくする必要がある。これに伴って絶縁材の前後幅が大きくなってしまい、この分だけ電池の薄型化が困難になる。   Even in the sealed battery described in Patent Document 3, as shown in FIG. 2C of Patent Document 3, the right end of the support wall provided on the insulating material is the leading edge of the lead body (FIG. 2C of Patent Document 3). ) Is in contact with the lower side. This prevents rotation of the lead body. However, in order to receive the lead body at the support wall portion, the support wall portion needs to be strong, and therefore the front and rear width of the support wall portion needs to be increased to some extent. . Along with this, the front-rear width of the insulating material is increased, and it is difficult to reduce the thickness of the battery.

本発明の目的は、絶縁材とリード体との部品管理の手間の軽減を図ることができ、かつリード体が電池缶の内面等に接触することを確実に防止できるとともに電池の薄型化を図ることができる密閉型電池の製造方法および密閉型電池を提供することにある。 An object of the present invention is to reduce the labor of component management between an insulating material and a lead body, and can reliably prevent the lead body from coming into contact with the inner surface of the battery can and the like, and reduce the thickness of the battery. It is another object of the present invention to provide a sealed battery manufacturing method and a sealed battery .

本発明は、左右横長の電池缶1の開口上面を塞ぐ蓋3に、出力端子12を挿通させるための貫通孔25を形成しておき、出力端子12と蓋3との間に絶縁パッキング10を介在させた状態で出力端子12を蓋3の貫通孔25に挿通させ、蓋3の下側に突出した出力端子12の下端部に、樹脂製の絶縁材11と共に左右横長のリード体13を取り付け、リード体13に、電池缶1内に収容した電極体2から延出する集電リード9を接続する密閉型電池の製造方法を対象とする。前記リード体13には、出力端子12の下端部が挿通する挿通孔27を形成してあるとともに、リード体13に絶縁材11が一体成形されるようになっている。かかるリード体13に絶縁材11を一体成形するための金型35の内部空間には、リード体13の挿通孔27が係合する係合ピン39と、リード体13を前後から挟み込む前後一対の挟持ピン41・41とを配置してある。そして、係合ピン39にリード体13の挿通孔29を係合させるとともに、一対の挟持ピン41・41の間にリード体13を嵌め込んで、リード体13を金型35の内部空間に装着したのち、金型35の内部空間に溶融樹脂を注入して、リード体13の前後左右と上面とに絶縁材11を被覆させたことを特徴とする。   In the present invention, a through hole 25 for inserting the output terminal 12 is formed in the lid 3 that closes the opening upper surface of the horizontally long battery can 1, and the insulating packing 10 is provided between the output terminal 12 and the lid 3. The output terminal 12 is inserted into the through-hole 25 of the lid 3 in the interposed state, and the left and right horizontally elongated lead bodies 13 are attached to the lower end portion of the output terminal 12 protruding to the lower side of the lid 3 together with the resin insulating material 11. A method for manufacturing a sealed battery in which the current collector lead 9 extending from the electrode body 2 accommodated in the battery can 1 is connected to the lead body 13 is an object. The lead body 13 is formed with an insertion hole 27 through which the lower end portion of the output terminal 12 is inserted, and the insulating material 11 is integrally formed with the lead body 13. In the inner space of the mold 35 for integrally molding the insulating material 11 on the lead body 13, an engagement pin 39 that engages with the insertion hole 27 of the lead body 13 and a pair of front and rear that sandwich the lead body 13 from the front and rear. Nipping pins 41 and 41 are arranged. Then, the insertion hole 29 of the lead body 13 is engaged with the engagement pin 39 and the lead body 13 is fitted between the pair of holding pins 41 and 41 so that the lead body 13 is mounted in the inner space of the mold 35. After that, molten resin is injected into the inner space of the mold 35 to cover the insulating material 11 on the front, rear, left and right and the upper surface of the lead body 13.

蓋3の下面に係合突起26が突出している。そして、リード体13に絶縁材11を一体成形する際に、絶縁材11の上面に、係合突起26が係合する係合部30を形成するものとすることができる。
また、リード体13に絶縁材11を一体成形する際に、絶縁材11の下面に、該絶縁材11の上下を識別するための識別部31を形成することができる。
An engaging protrusion 26 protrudes from the lower surface of the lid 3. When the insulating material 11 is integrally formed with the lead body 13, the engaging portion 30 with which the engaging protrusion 26 engages can be formed on the upper surface of the insulating material 11.
In addition, when the insulating material 11 is integrally formed on the lead body 13, an identification portion 31 for identifying the upper and lower sides of the insulating material 11 can be formed on the lower surface of the insulating material 11.

また、本発明に係る密閉型電池は、左右横長の開口上面を有する電池缶1と、電池缶1の開口上面を塞ぐ蓋3と、蓋3に設けられた貫通孔25に挿通された状態で固定される出力端子12と、蓋3と出力端子12との間に介在される絶縁パッキング10と、蓋3の下側に突出した出力端子12の下端部に取り付けられる左右横長のリード体13とを備える。リード体13には、電池缶1内に収容した電極体2から延出する集電リード9が接続されている。リード体13には、出力端子12の下端部が挿通される挿通孔27が形成されており、リード体13が、該リード体13の上面および左右の側面を被覆する絶縁材11に一体に成形されていることを特徴とする。
Further, the sealed battery according to the present invention is inserted in a battery can 1 having a horizontally long open upper surface, a lid 3 that closes the open upper surface of the battery can 1, and a through hole 25 provided in the lid 3. An output terminal 12 to be fixed, an insulating packing 10 interposed between the lid 3 and the output terminal 12, and a horizontally long lead body 13 attached to a lower end portion of the output terminal 12 protruding below the lid 3. Is provided. A current collecting lead 9 extending from the electrode body 2 accommodated in the battery can 1 is connected to the lead body 13. The lead body 13 is formed with an insertion hole 27 through which the lower end portion of the output terminal 12 is inserted. The lead body 13 is integrally formed with the insulating material 11 covering the upper surface and the left and right side surfaces of the lead body 13. It is characterized by being.

本発明においては、リード体13と絶縁材11とを一体化したので、電池の製造に際しての部品点数を、リード体13と絶縁材11とを別体にした場合よりも減らすことができる。この分だけ電池の製造時における部品管理の手間等を軽減することができる。また、例えばリード体13が出力端子12を軸に回転しても、リード体13と一体になって回転する絶縁材11によって、リード体13が電池缶1の内面等に接触して短絡することが確実に防止される。   In the present invention, since the lead body 13 and the insulating material 11 are integrated, the number of parts in manufacturing the battery can be reduced as compared with the case where the lead body 13 and the insulating material 11 are separated. It is possible to reduce the time and labor of parts management at the time of manufacturing the battery. Further, for example, even if the lead body 13 rotates around the output terminal 12, the lead body 13 contacts the inner surface of the battery can 1 and is short-circuited by the insulating material 11 that rotates integrally with the lead body 13. Is reliably prevented.

かかるリード体13に絶縁材11を一体成形するための金型35の内部空間に、リード体13の挿通孔27が係合する係合ピン39と、リード体13を前後から挟み込む一対の挟持ピン41・41とを設けてあるので、金型35内において、係合ピン39とリード体13の挿通孔27との係合で、リード体13の横方向のスライド移動が規制される。このうえで、挟持ピン41・41によってリード体13が係合ピン39を軸に回転することが規制される。つまり、金型35内でリード体13は、係合ピン39と前後の挟持ピン41・41とによって確実に位置決めされる。これにて、金型35内でリード体13がずれ動いて、リード体13が金型35の内部空間の前後左右の内面に接触し、該接触箇所に絶縁材11が成形されなくなることを防止できる。つまり、リード体13の前後左右を絶縁材11で確実に被覆することができる。   An engagement pin 39 that engages with the insertion hole 27 of the lead body 13 and a pair of sandwiching pins that sandwich the lead body 13 from the front and rear in an internal space of a mold 35 for integrally molding the insulating material 11 on the lead body 13. Since 41 and 41 are provided, the sliding movement of the lead body 13 in the lateral direction is restricted by the engagement of the engagement pin 39 and the insertion hole 27 of the lead body 13 in the mold 35. In addition, the rotation of the lead body 13 around the engaging pin 39 is restricted by the pinching pins 41 and 41. That is, the lead body 13 is reliably positioned in the mold 35 by the engagement pin 39 and the front and rear clamping pins 41 and 41. This prevents the lead body 13 from moving in the mold 35 so that the lead body 13 contacts the front, back, left and right inner surfaces of the inner space of the mold 35 and the insulating material 11 is not molded at the contact location. it can. That is, the front, rear, left and right of the lead body 13 can be reliably covered with the insulating material 11.

しかも、リード体13の前後左右の内面には、二つの挟持ピン41・41しか接触しないので、リード体13の前後左右の内面において、前記位置決めに伴って絶縁材11で被覆されない箇所を二箇所のみに抑えることができる。つまり、リード体13の前後左右において、リード体13の露出部分を最小限にでき、リード体13の前後左右が電池缶1の内面等に接触して短絡することがより確実に防止される。   In addition, since only two clamping pins 41 and 41 are in contact with the front and rear, left and right inner surfaces of the lead body 13, two locations on the front and rear, left and right inner surfaces of the lead body 13 that are not covered with the insulating material 11 due to the positioning are provided. Can only be suppressed. That is, the exposed portions of the lead body 13 can be minimized at the front, rear, left and right of the lead body 13, and the front, rear, left and right of the lead body 13 can be more reliably prevented from coming into contact with the inner surface of the battery can 1 and the like.

そして、絶縁材11は、リード体13を被覆するだけでよく、リード体13の回転を阻止することを目的としないので強度が必要ではない。したがって、絶縁材11の前後左右の厚みを小さくして、絶縁材11とリード体13との一体成形体の前後左右の幅を小さくできる。しかも、例えば、絶縁材11とリード体13とを別々の単体として形成して、これらを組み付ける場合には、絶縁材11の下面に形成した凹部内にリード体13を嵌め込むことになるが、製造誤差を考慮して絶縁材11の前記凹部の内面とリード体13との間に隙間を設ける必要がある。本発明では、絶縁材11とリード体13とを一体成形することで前記隙間を設ける必要がなく、これによっても絶縁材11とリード体13との一体成形体の前後左右の幅を小さくできる。これらの分だけ電池の前後左右の幅を小さくすることができ、電池の薄型化を図ることができる。   The insulating material 11 only needs to cover the lead body 13, and does not aim to prevent the lead body 13 from rotating, so that strength is not required. Therefore, the front and rear, left and right thicknesses of the insulating material 11 can be reduced, and the front and rear, left and right widths of the integrally formed body of the insulating material 11 and the lead body 13 can be reduced. Moreover, for example, when the insulating material 11 and the lead body 13 are formed as separate single bodies and these are assembled, the lead body 13 is fitted into the recess formed in the lower surface of the insulating material 11. It is necessary to provide a gap between the inner surface of the concave portion of the insulating material 11 and the lead body 13 in consideration of manufacturing errors. In the present invention, it is not necessary to provide the gap by integrally forming the insulating material 11 and the lead body 13, and this also makes it possible to reduce the width of the integrally formed body of the insulating material 11 and the lead body 13. Accordingly, the width of the front, rear, left and right of the battery can be reduced by that amount, and the battery can be made thinner.

絶縁材11の上面に係合部30を形成すると、蓋3の係合突起26が絶縁材11の係合部30に係合することで、絶縁材11およびリード体13の一体成形体が出力端子12を軸に回転することが抑えられ、これに伴って絶縁材11およびリード体13の一体成形体が他の部材と干渉すること等が防止される。   When the engaging portion 30 is formed on the upper surface of the insulating material 11, the engaging protrusion 26 of the lid 3 is engaged with the engaging portion 30 of the insulating material 11, so that the integrally formed body of the insulating material 11 and the lead body 13 is output. It is possible to prevent the terminal 12 from rotating around the shaft, and accordingly, the integrally formed body of the insulating material 11 and the lead body 13 is prevented from interfering with other members.

絶縁材11の下面に識別部31が設けられていると、パーツフィーダ等において、識別部31に基づいてリード体13と絶縁材11との一体成形体の上下を適正に揃えることができる。これにて、例えば自動組立機で電池を組み立てる場合に、リード体13と絶縁材11との一体成形体を上下を間違えることなく、出力端子12の下端部に取り付けることができる。   If the identification part 31 is provided on the lower surface of the insulating material 11, the upper and lower sides of the integrally formed body of the lead body 13 and the insulating material 11 can be properly aligned in a parts feeder or the like based on the identification part 31. Thus, for example, when the battery is assembled by an automatic assembly machine, the integrally formed body of the lead body 13 and the insulating material 11 can be attached to the lower end portion of the output terminal 12 without making a mistake in the upper and lower sides.

本発明に係る密閉型電池は、図2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蓋3と、蓋3の内側に配置される絶縁体5とを含む。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と蓋3とによって電池ケース6が形成される。   As shown in FIG. 2, the sealed battery according to the present invention includes a bottomed cylindrical battery can 1 having a horizontally long opening on the upper surface, an electrode body 2 accommodated in the battery can 1, and a non-aqueous electrolyte. And a horizontally long lid 3 that closes and seals the upper surface of the opening of the battery can 1, and an insulator 5 that is disposed inside the lid 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 lid 3.

電極体2は、例えば、帯状の正極と帯状の負極との間に帯状のセパレータを介在させた状態で渦巻状に巻回して作製され、巻回状態で扁平状になっている。正極は、コバルト酸リチウム等の正極活物質を含有する正極活物質層が帯状の正極集電体の裏表両面に形成されており、正極集電体から薄板状の正極集電リード8が導出される。   The electrode body 2 is produced, for example, by spirally winding a strip-shaped separator between a strip-shaped positive electrode and a strip-shaped negative electrode, and is flat in the wound state. In the positive electrode, a positive electrode active material layer containing a positive electrode active material such as lithium cobaltate is formed on both sides of a belt-like positive electrode current collector, and a thin plate-like positive electrode current collector lead 8 is derived from the positive electrode current collector. The

負極は、黒鉛等の負極活物質を含有する負極活物質層が帯状の負極集電体の裏表両面に形成されており、負極集電体から薄板状の負極集電リード9が導出される。セパレータは、ポリエチレン樹脂等の微多孔性薄膜フィルム等からなる。非水電解液は、エチレンカーボネートとメチルエチルカーボネートとを混合した溶媒にLiPF6 を溶解させて作製した。 In the negative electrode, negative electrode active material layers containing a negative electrode active material such as graphite are formed on both front and back surfaces of a strip-shaped negative electrode current collector, and a thin plate-like negative electrode current collector lead 9 is led out from the negative electrode current collector. The separator is made of a microporous thin film such as polyethylene resin. The non-aqueous electrolyte was prepared by dissolving LiPF 6 in a solvent obtained by mixing ethylene carbonate and methyl ethyl carbonate.

電池缶1は、アルミニウム又はアルミニウム合金の板材の深絞り成形品である。蓋3は、アルミニウム又はアルミニウム合金の板材のプレス成形品であり、電池缶1の開口周縁に、蓋3の外周縁がYAGレーザ等のレーザ光でシーム溶接される。蓋3の中央には、上側の絶縁パッキング10および下側の絶縁材11を介して負極端子(出力端子)12が貫通状に取り付けられる。負極端子12の下端には、蓋3の内面において左右横長の長方形のニッケル板等からなるリード体13が固定される。絶縁パッキング10および絶縁材11は、ポリプロピレン等の絶縁性の樹脂からなる。   The battery can 1 is a deep drawn product of aluminum or aluminum alloy plate. The lid 3 is a press-molded product made of aluminum or an aluminum alloy plate, and the outer peripheral edge of the lid 3 is seam welded to the opening peripheral edge of the battery can 1 with a laser beam such as a YAG laser. In the center of the lid 3, a negative electrode terminal (output terminal) 12 is attached in a penetrating manner via an upper insulating packing 10 and a lower insulating material 11. A lead body 13 made of a horizontally long rectangular nickel plate or the like is fixed to the lower end of the negative electrode terminal 12 on the inner surface of the lid 3. The insulating packing 10 and the insulating material 11 are made of an insulating resin such as polypropylene.

蓋3の左右方向の右端寄りには、平面視で円形となる電解液注入用の注液孔14が上下貫通状に開設され、注液孔14から電池ケース6内に非水電解液を注入したのちに、注液孔14に封止栓15が係合されて蓋3に溶接される。リード体13は、負極端子12から注液孔14の反対側に向けて伸びている。   Near the right end of the lid 3 in the lateral direction, a liquid injection hole 14 for injecting an electrolyte that is circular in plan view is formed in a vertically penetrating manner, and a nonaqueous electrolyte is injected into the battery case 6 from the liquid injection hole 14. After that, the sealing plug 15 is engaged with the liquid injection hole 14 and welded to the lid 3. The lead body 13 extends from the negative electrode terminal 12 toward the opposite side of the liquid injection hole 14.

負極端子12は、図1および図4に示すように、扁平角型形状の頭部17と、該頭部17の下面中央から下向きに伸びる円柱状の軸部18とからなる。絶縁パッキング10は、負極端子12の頭部17を受け止める扁平角型形状の頭部20と、該頭部20の下面中央から下向きに伸びて負極端子12の軸部18が挿通する円筒状の筒部21とからなる。絶縁パッキング10の頭部20の上面には、負極端子12の頭部17が係合する凹部22が設けられる。蓋3の中央の上面側には、絶縁パッキング10の頭部20が係合する凹部24が設けられている。該凹部24の中央には、平面視で円形となる貫通孔25が設けられる。該貫通孔25には、負極端子12と蓋3との間に絶縁パッキング10の筒部21を介在させた状態で負極端子12の軸部18が挿通する。   As shown in FIGS. 1 and 4, the negative electrode terminal 12 includes a flat rectangular head portion 17 and a columnar shaft portion 18 extending downward from the center of the lower surface of the head portion 17. The insulating packing 10 includes a flat rectangular head 20 that receives the head 17 of the negative terminal 12, and a cylindrical tube that extends downward from the center of the lower surface of the head 20 and passes through the shaft portion 18 of the negative terminal 12. Part 21. On the upper surface of the head 20 of the insulating packing 10, a recess 22 is provided in which the head 17 of the negative electrode terminal 12 is engaged. On the upper surface side in the center of the lid 3, a recess 24 is provided in which the head 20 of the insulating packing 10 is engaged. A through hole 25 that is circular in plan view is provided in the center of the recess 24. The shaft portion 18 of the negative electrode terminal 12 is inserted into the through hole 25 with the cylindrical portion 21 of the insulating packing 10 interposed between the negative electrode terminal 12 and the lid 3.

リード体13は、絶縁材11と一体成形されており、該絶縁材11によって該リード体13の上面および前後左右の側面が被覆されている。これにてリード体13は、蓋3と絶縁される。リード体13の下面は、絶縁材11から露出していて負極集電リード9が溶接される。リード体13には、平面視で円形となる挿通孔27を形成してあり、該挿通孔27には、絶縁パッキング10の筒部21から下方に突出した負極端子12の軸部18の下端部が挿通する。なお、リード体13は、四隅がそれぞれ切り取られて、隅切り角状に形成されている。   The lead body 13 is integrally formed with the insulating material 11, and the upper surface of the lead body 13 and the front, rear, left and right side surfaces are covered with the insulating material 11. As a result, the lead body 13 is insulated from the lid 3. The lower surface of the lead body 13 is exposed from the insulating material 11 and the negative electrode current collecting lead 9 is welded. The lead body 13 is formed with an insertion hole 27 that is circular in plan view, and the insertion hole 27 has a lower end portion of the shaft portion 18 of the negative electrode terminal 12 protruding downward from the cylindrical portion 21 of the insulating packing 10. Is inserted. Note that the lead body 13 is formed in a corner-cut shape by cutting off four corners.

絶縁材11には、絶縁パッキング10の筒部21の下端部が係合する平面視で円形となる貫通孔29が設けられる。絶縁材11の上面には、蓋3の下面に設けた突起26が係合する平面視で円形となる係合凹部(係合部)30が形成される。そして、絶縁材11の係合凹部30に蓋3の突起26が係合することで、蓋3に対する絶縁材11およびリード体13の一体成形体の回り止めが図られる。絶縁材11の下面の左右両側には、該絶縁材11の上下を識別するための識別用突起(識別部)31・31がそれぞれ設けられる。絶縁パッキング10の頭部20の下面側には、樹脂を節減するための凹部32が形成されている。   The insulating material 11 is provided with a through hole 29 that is circular in a plan view with which the lower end portion of the cylindrical portion 21 of the insulating packing 10 is engaged. On the upper surface of the insulating material 11, there is formed an engagement recess (engagement portion) 30 that is circular in plan view with which the protrusion 26 provided on the lower surface of the lid 3 is engaged. Then, the protrusion 26 of the lid 3 is engaged with the engaging recess 30 of the insulating material 11, so that the integrally molded body of the insulating material 11 and the lead body 13 with respect to the lid 3 is prevented from rotating. Identification protrusions (identification portions) 31 and 31 for identifying the upper and lower sides of the insulating material 11 are provided on the left and right sides of the lower surface of the insulating material 11, respectively. On the lower surface side of the head 20 of the insulating packing 10, a recess 32 for saving resin is formed.

正極集電リード8は、図2に示すように、蓋3の裏面において絶縁材11と注液孔14との間のスペースに溶接される。これで正極集電リード8が蓋3および電池缶1に導通する。蓋3の左右方向の左端寄りには、開裂ベント33が形成されており、開裂ベント33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。   As shown in FIG. 2, the positive electrode current collector lead 8 is welded to the space between the insulating material 11 and the liquid injection hole 14 on the back surface of the lid 3. Thus, the positive electrode current collecting lead 8 is electrically connected to the lid 3 and the battery can 1. A cleaving vent 33 is formed near the left end of the lid 3 in the left-right direction, and the cleaving vent 33 is cleaved to release the battery internal pressure when the battery internal pressure rises abnormally.

リード体13に絶縁材11を一体成形(インサート成形)するための金型を、図5ないし図7を用いて説明する。かかる金型35の下型36において、図5および図6に示すように、左右横長の内部空間の下面38の左右方向の一端寄り側には、リード体13の挿通孔27が係合する円柱状の係合ピン39が上向きに突出している。該係合ピン39の上端部は、テーパ状に形成されている。また、下型36の内部空間の前後(図5では上下)の両側面40・40の左右方向の他端寄りには、リード体13を前後両側から挟み込む前後一対の挟持ピン41・41がそれぞれ突出している。各挟持ピン41は、下型36の内部空間の内面に沿って上下方向に伸びており、横断面で半円形に形成されている。各挟持ピン41の上部は、図7に示すように、傾斜状に切り欠かれている。下型36の内部空間の下面38の左右両側には、絶縁材11の識別用突起31・31を形成するための凹部42・42がそれぞれ凹み形成されている。   A mold for integrally molding (insert molding) the insulating material 11 on the lead body 13 will be described with reference to FIGS. In the lower mold 36 of the mold 35, as shown in FIGS. 5 and 6, a circular hole with which the insertion hole 27 of the lead body 13 is engaged on the side closer to one end in the left-right direction of the lower surface 38 of the horizontally long inner space. A columnar engagement pin 39 protrudes upward. The upper end portion of the engagement pin 39 is formed in a tapered shape. Also, a pair of front and rear clamping pins 41 and 41 for sandwiching the lead body 13 from both front and rear sides are provided near the other end in the left and right direction on both sides 40 and 40 in the front and rear (up and down in FIG. 5) of the internal space of the lower die 36. It protrudes. Each pin 41 extends in the vertical direction along the inner surface of the internal space of the lower die 36 and is formed in a semicircular shape in cross section. As shown in FIG. 7, the upper part of each pin 41 is cut out in an inclined shape. On both the left and right sides of the lower surface 38 of the inner space of the lower mold 36, recesses 42 and 42 for forming the identification protrusions 31 and 31 of the insulating material 11 are respectively formed.

金型35の上型45の内面46には、前記下型36の係合ピン39の上端部に係合して絶縁材11の貫通孔29を形成するための環状突起47が形成されている。また、上型45の内面46には、絶縁材11の係合凹部30を形成するための円柱状の突起49が形成されている。上型45の内面46には、ゲート50の開口部50aを下端に配置した突起51が金型35の内部空間側へ膨出している。ゲート50の開口部50aから金型35の内部空間へ溶融樹脂が注入される。   An annular protrusion 47 is formed on the inner surface 46 of the upper mold 45 of the mold 35 to engage with the upper end of the engagement pin 39 of the lower mold 36 to form the through hole 29 of the insulating material 11. . A cylindrical projection 49 for forming the engagement recess 30 of the insulating material 11 is formed on the inner surface 46 of the upper mold 45. On the inner surface 46 of the upper mold 45, a protrusion 51 having an opening 50 a of the gate 50 disposed at the lower end bulges toward the inner space side of the mold 35. Molten resin is injected from the opening 50 a of the gate 50 into the internal space of the mold 35.

そして、リード体13に絶縁材11を一体成形する際には、下型36の係合ピン39にリード体13の挿通孔27を係合するとともに、リード体13を前後の挟持ピン41・41の間に嵌め込む。これにて、リード体13が、係合ピン39および前後の挟持ピン41・41によって上型45の内部空間内に位置決めされる。このリード体13の金型35の内部空間への装着後に、下型36に上型45を装着し、ゲート50から金型35の内部空間に溶融樹脂を注入する。これによって図4に示すように、リード体13の前後左右と上面とに絶縁材11が被覆される。なお、環状突起47によって、金型35内でのリード体13の浮き上がりが規制される。   When the insulating material 11 is formed integrally with the lead body 13, the insertion hole 27 of the lead body 13 is engaged with the engagement pin 39 of the lower die 36, and the lead body 13 is held between the front and rear clamping pins 41 and 41. Fit between. Thus, the lead body 13 is positioned in the internal space of the upper mold 45 by the engagement pin 39 and the front and rear holding pins 41 and 41. After the lead body 13 is mounted in the inner space of the mold 35, the upper mold 45 is mounted on the lower mold 36 and molten resin is injected from the gate 50 into the inner space of the mold 35. As a result, as shown in FIG. Note that the annular protrusion 47 restricts the floating of the lead body 13 in the mold 35.

電池の組み立てに際しては、絶縁パッキング10の筒部21を蓋3の貫通孔25に挿通するとともに、負極端子12の軸部18を絶縁パッキング10の筒部21に挿通する。また、絶縁パッキング10の筒部21の下端部を絶縁材11の貫通孔29に挿通するとともに、負極端子12の軸部18の下端部をリード体13の挿通孔27に挿通する。この状態で負極端子12をかしめて負極端子12の軸部18の下端部を外方に広げ、蓋3に対して、負極端子12と、絶縁パッキング10と、絶縁材11およびリード体13の一体成形体とをそれぞれ固定する。   When assembling the battery, the cylindrical portion 21 of the insulating packing 10 is inserted into the through hole 25 of the lid 3, and the shaft portion 18 of the negative electrode terminal 12 is inserted into the cylindrical portion 21 of the insulating packing 10. Further, the lower end portion of the cylindrical portion 21 of the insulating packing 10 is inserted into the through hole 29 of the insulating material 11, and the lower end portion of the shaft portion 18 of the negative electrode terminal 12 is inserted into the insertion hole 27 of the lead body 13. In this state, the negative electrode terminal 12 is caulked and the lower end portion of the shaft portion 18 of the negative electrode terminal 12 is spread outward, and the negative electrode terminal 12, the insulating packing 10, the insulating material 11, and the lead body 13 are integrated with the lid 3. Each of the molded bodies is fixed.

次いで、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、絶縁材11で被覆されていないリード体13の下面に負極集電リード9をスポット溶接し、蓋3の下面に正極集電リード8をスポット溶接する。この後、電池缶1の開口周縁に蓋3をシーム溶接し、電池缶1内を真空減圧して注液孔14から非水電解液を注入する。非水電解液の注入完了後に、封止栓15を注液孔14に係合して蓋3の注液孔14の周縁部にレーザ溶接する。これにて、図2に示す電池が形成される。   Next, after the electrode body 2 and the insulator 5 are accommodated in the battery can 1, the negative electrode current collector lead 9 is spot welded to the lower surface of the lead body 13 not covered with the insulating material 11, and the positive electrode is connected to the lower surface of the lid 3. The current collecting lead 8 is spot welded. Thereafter, the lid 3 is seam welded to the periphery of the opening of the battery can 1, and the inside of the battery can 1 is vacuum-reduced to inject a non-aqueous electrolyte from the liquid injection hole 14. After the injection of the non-aqueous electrolyte is completed, the sealing plug 15 is engaged with the liquid injection hole 14 and laser welded to the peripheral portion of the liquid injection hole 14 of the lid 3. Thus, the battery shown in FIG. 2 is formed.

前記成形後の絶縁材11には、前記両挟持ピン41・41とリード体13との接触に対応して非絶縁部52・52が前後にそれぞれ形成され、図3に示すように、該非絶縁部52・52においてリード体13の側面が露出するが、リード体13の側面と電池缶1の内面との間には距離があるため、非絶縁部52・52で露出したリード体13の側面が、電池缶1の内面に接触することがない。   In the insulating material 11 after molding, non-insulating portions 52 and 52 are respectively formed in front and rear corresponding to the contact between the both pinching pins 41 and 41 and the lead body 13, and as shown in FIG. The side surfaces of the lead body 13 are exposed at the portions 52 and 52, but there is a distance between the side surface of the lead body 13 and the inner surface of the battery can 1, so the side surfaces of the lead body 13 exposed at the non-insulating portions 52 and 52 are However, it does not contact the inner surface of the battery can 1.

このように、リード体13と絶縁材11とを一体化したので、電池の製造に際しての部品点数を、リード体13と絶縁材11とを別体にした場合よりも減らすことができる。また、例えばリード体13が負極端子12を軸に回転しても、リード体13と一体になって回転する絶縁材11によって、リード体13が電池缶1の内面等に接触して短絡することが確実に防止される。   Thus, since the lead body 13 and the insulating material 11 are integrated, the number of parts at the time of manufacture of a battery can be reduced rather than the case where the lead body 13 and the insulating material 11 are made into a different body. For example, even if the lead body 13 rotates about the negative electrode terminal 12, the lead body 13 contacts the inner surface of the battery can 1 and is short-circuited by the insulating material 11 that rotates integrally with the lead body 13. Is reliably prevented.

かかるリード体13に絶縁材11を一体成形するための金型35の内部空間に、リード体13の挿通孔27が係合する係合ピン39と、リード体13を前後から挟み込む一対の挟持ピン41・41とを設けてあるので、金型35内において、係合ピン39とリード体13の挿通孔27との係合で、リード体13の横方向のスライド移動が規制される。このうえで、挟持ピン41・41によってリード体13が係合ピン39を軸に回転することが規制される。つまり、金型35内でリード体13は、係合ピン39と前後の挟持ピン41・41とによって確実に位置決めされる。   An engagement pin 39 that engages with the insertion hole 27 of the lead body 13 and a pair of sandwiching pins that sandwich the lead body 13 from the front and rear in an internal space of a mold 35 for integrally molding the insulating material 11 on the lead body 13. Since 41 and 41 are provided, the sliding movement of the lead body 13 in the lateral direction is restricted by the engagement of the engagement pin 39 and the insertion hole 27 of the lead body 13 in the mold 35. In addition, the rotation of the lead body 13 around the engaging pin 39 is restricted by the pinching pins 41 and 41. That is, the lead body 13 is reliably positioned in the mold 35 by the engagement pin 39 and the front and rear clamping pins 41 and 41.

しかも、リード体13の前後左右の内面には、二つの挟持ピン41・41しか接触しないので、リード体13の前後左右の内面において、前記位置決めに伴って絶縁材11で被覆されない非絶縁部52・52を二箇所のみに抑えることができる。つまり、リード体13の前後左右において、リード体13の露出部分を最小限にでき、リード体13の前後左右が電池缶1の内面等に接触して短絡することがより確実に防止される。   In addition, since only two clamping pins 41 and 41 are in contact with the front, rear, left, and right inner surfaces of the lead body 13, the non-insulating portions 52 that are not covered with the insulating material 11 along with the positioning on the front, rear, left, and right inner surfaces of the lead body 13. -52 can be suppressed to only two places. That is, the exposed portions of the lead body 13 can be minimized at the front, rear, left and right of the lead body 13, and the front, rear, left and right of the lead body 13 can be more reliably prevented from coming into contact with the inner surface of the battery can 1 and the like.

なお、金型35の下型36内において、各挟持ピン41を下型36の内部空間の内面から離して配置してもよい。挟持ピン41は、横断面で三角形や四角形等に形成されていてもよい。絶縁材11の識別用突起31・31は省略してもよい。出力端子12が正極で、電池缶1および蓋3が負極であってもよい。   In the lower mold 36 of the mold 35, each clamping pin 41 may be arranged away from the inner surface of the inner space of the lower mold 36. The pin 41 may be formed in a triangle, a quadrangle, or the like in the cross section. The identification protrusions 31 of the insulating material 11 may be omitted. The output terminal 12 may be a positive electrode, and the battery can 1 and the lid 3 may be a negative electrode.

本発明に係る密閉型電池の要部を示す縦断正面図である。It is a vertical front view which shows the principal part of the sealed battery which concerns on this invention. 本発明に係る密閉型電池の縦断正面図である。It is a vertical front view of the sealed battery which concerns on this invention. 図1のA−A線断面図である。It is the sectional view on the AA line of FIG. 密閉型電池の蓋部分の分解斜視図である。It is a disassembled perspective view of the cover part of a sealed battery. 絶縁材の成形用金型にリード体を装着した状態を示す横断平面図である。It is a cross-sectional top view which shows the state which mounted | wore the lead | metal | die body with the metal mold | die for insulation materials. 図5のB−B線断面図である。FIG. 6 is a sectional view taken along line B-B in FIG. 5. 図6のC−C線断面図である。It is CC sectional view taken on the line of FIG.

符号の説明Explanation of symbols

1 電池缶
2 電極体
3 蓋
9 負極集電リード
10 絶縁パッキング
11 絶縁材
12 負極端子
13 リード体
25 貫通孔
26 係合突起
27 挿通孔
30 係合凹部
31 識別用突起
35 金型
39 係合ピン
41 挟持ピン
DESCRIPTION OF SYMBOLS 1 Battery can 2 Electrode body 3 Cover | cover 9 Negative electrode current collection lead 10 Insulation packing 11 Insulation material 12 Negative electrode terminal 13 Lead body 25 Through hole 26 Engagement protrusion 27 Insertion hole 30 Engagement recessed part 31 Identification protrusion 35 Mold 39 Engagement pin 41 pinching pin

Claims (4)

左右横長の電池缶の開口上面を塞ぐ蓋に、出力端子を挿通させるための貫通孔を形成しておき、前記出力端子と前記蓋との間に絶縁パッキングを介在させた状態で前記出力端子を前記貫通孔に挿通させ、前記蓋の下側に突出した前記出力端子の下端部に、樹脂製の絶縁材と共に左右横長のリード体を取り付け、
該リード体に、前記電池缶内に収容した電極体から延出する集電リードを接続する密閉型電池の製造方法において、
前記リード体には、前記出力端子の下端部が挿通する挿通孔を形成してあるとともに、前記リード体に前記絶縁材が一体成形されるようになっており、
前記リード体に前記絶縁材を一体成形するための金型の内部空間には、前記リード体の前記挿通孔が係合する係合ピンと、前記リード体を前後から挟み込む前後一対の挟持ピンとを配置してあり、
前記係合ピンに前記リード体の前記挿通孔を係合させるとともに、前記一対の挟持ピンの間に前記リード体を嵌め込んで、該リード体を前記金型の前記内部空間に装着したのち、前記金型の前記内部空間に溶融樹脂を注入して、前記リード体の前後左右と上面とに前記絶縁材を被覆させたことを特徴とする密閉型電池の製造方法。
A through hole for inserting the output terminal is formed in the lid that closes the upper open surface of the left and right horizontally long battery cans, and the output terminal is inserted with an insulating packing interposed between the output terminal and the lid. At the lower end of the output terminal that is inserted through the through-hole and protrudes to the lower side of the lid, a horizontally long lead body is attached together with a resin insulating material,
In the method of manufacturing a sealed battery, the current collector lead connecting from the electrode body accommodated in the battery can is connected to the lead body,
The lead body is formed with an insertion hole through which the lower end of the output terminal is inserted, and the insulating material is integrally formed with the lead body,
An engagement pin that engages with the insertion hole of the lead body and a pair of front and rear clamping pins that sandwich the lead body from the front and rear are disposed in the inner space of the mold for integrally molding the insulating material on the lead body. And
After engaging the insertion hole of the lead body with the engagement pin, fitting the lead body between the pair of clamping pins, and mounting the lead body in the internal space of the mold, A method of manufacturing a sealed battery, wherein molten resin is injected into the inner space of the mold, and the insulating material is coated on front, rear, left, right, and upper surfaces of the lead body.
前記蓋の下面には、係合突起が突出しており、
前記リード体に前記絶縁材を一体成形する際に、前記絶縁材の上面に、前記係合突起が係合する係合部を形成する請求項1記載の密閉型電池の製造方法。
An engaging protrusion protrudes from the lower surface of the lid,
The method for manufacturing a sealed battery according to claim 1, wherein when the insulating material is integrally formed on the lead body, an engaging portion that engages with the engaging protrusion is formed on an upper surface of the insulating material.
前記リード体に前記絶縁材を一体成形する際に、前記絶縁材の下面に、該絶縁材の上下を識別するための識別部を形成する請求項1又は2記載の密閉型電池の製造方法。   The method for manufacturing a sealed battery according to claim 1 or 2, wherein when the insulating material is integrally formed on the lead body, an identification portion for identifying the upper and lower sides of the insulating material is formed on the lower surface of the insulating material. 左右横長の開口上面を有する電池缶と、A battery can having left and right horizontally open upper surfaces;
前記電池缶の開口上面を塞ぐ蓋と、A lid for closing the upper surface of the opening of the battery can;
前記蓋に設けられた貫通孔に挿通された状態で固定される出力端子と、An output terminal fixed in a state of being inserted into a through hole provided in the lid;
前記蓋と前記出力端子との間に介在される絶縁パッキングと、Insulating packing interposed between the lid and the output terminal;
前記蓋の下側に突出した前記出力端子の下端部に取り付けられる左右横長のリード体と、Left and right laterally long lead bodies attached to the lower end portion of the output terminal protruding to the lower side of the lid;
を備え、With
前記リード体に、前記電池缶内に収容した電極体から延出する集電リードが接続されており、A current collecting lead extending from the electrode body accommodated in the battery can is connected to the lead body,
前記リード体には、前記出力端子の下端部が挿通される挿通孔が形成されており、The lead body has an insertion hole through which the lower end of the output terminal is inserted,
前記リード体が、該リード体の上面および左右の側面を被覆する絶縁材に一体に成形されていることを特徴とする密閉型電池。A sealed battery, wherein the lead body is integrally formed with an insulating material covering an upper surface and left and right side surfaces of the lead body.
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