JP2010212111A - Terminal structure of sealed battery - Google Patents

Terminal structure of sealed battery Download PDF

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JP2010212111A
JP2010212111A JP2009057458A JP2009057458A JP2010212111A JP 2010212111 A JP2010212111 A JP 2010212111A JP 2009057458 A JP2009057458 A JP 2009057458A JP 2009057458 A JP2009057458 A JP 2009057458A JP 2010212111 A JP2010212111 A JP 2010212111A
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terminal
lid
external
terminals
internal
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JP5446339B2 (en
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Masato Komatsuki
正人 駒月
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Toyota Motor Corp
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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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  • Connection Of Batteries Or Terminals (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a terminal structure of a sealed battery, which can reduce the number of components and simplifies its assembling. <P>SOLUTION: A rivet 18 for caulking is integrally arranged on external terminals 3, 4, in a terminal assembly 1 of the sealed battery including the external terminals 3, 4 and internal terminals 5, 6. The external terminals 3, 4 and the internal terminals 5, 6 are constituted so as to connect each other since the rivet 18 is caulked to the internal terminals 5, 6. The terminal assembly 1 includes a lid 2 of a case of the sealed battery, and the external terminals 3, 4 are fixed on the lid 2 by insert-molding of a resin 17. The external terminals 3, 4 have: male screws 15 for fastening; and a plurality of ribs functioning as locking against the lid 2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

この発明は、電池要素が容器に収容されて構成される密閉型電池に係り、詳しくは、外部端子と内部端子を含む密閉型電池の端子構造に関する。   The present invention relates to a sealed battery configured by accommodating battery elements in a container, and more particularly to a terminal structure of a sealed battery including an external terminal and an internal terminal.

従来、この種の技術として、例えば、下記の特許文献１には、二次電池の端子構造が記載されている。この二次電池は、ケースに収容される電極体を備える。電極体の上端には放圧補助部材が設けられ、その補助部材の両端には、正極内部端子と負極内部端子がフランジにて固定される。両内部端子のフランジ上には、絶縁部材が配置され、その上から蓋体が被せられる。両フランジ上には蓋体を貫通するボルト状の正極外部端子、負極外部端子がそれぞれ突設される。蓋体を貫通した両外部端子の周囲には、それぞれ絶縁パッキンが配置され、両外部端子にナットをそれぞれネジ止めすることで、両外部端子と蓋体との間をシールするようになっている。こうして蓋体と連結された電極体等は、ケースの上端開口からその内部に収容され、ケースと蓋体がレーザ溶接等により固定される。   Conventionally, as this type of technology, for example, the following Patent Document 1 describes a terminal structure of a secondary battery. This secondary battery includes an electrode body accommodated in a case. A pressure relief auxiliary member is provided at the upper end of the electrode body, and a positive electrode internal terminal and a negative electrode internal terminal are fixed to both ends of the auxiliary member by flanges. An insulating member is disposed on the flanges of both internal terminals, and a lid is placed over the insulating member. On both flanges, a bolt-shaped positive external terminal and a negative external terminal projecting through the lid are respectively provided. Insulation packing is arranged around both external terminals that penetrate the lid, and the nuts are screwed to the external terminals to seal between the external terminals and the lid. . The electrode body and the like thus connected to the lid body are accommodated in the inside from the upper end opening of the case, and the case and the lid body are fixed by laser welding or the like.

一方、下記の特許文献２には、接続端子とキャップハウジング等をインサート射出成形により一体化することが記載されている。   On the other hand, Patent Document 2 below describes that a connection terminal and a cap housing are integrated by insert injection molding.

特開２００４−３１９１０１号公報JP 2004-319101 A 特開２００８−５２００７７号公報JP 2008-520077 A 特開２００３−２２９１１６号公報JP 2003-229116 A 特開平０８−２８７８９６号公報Japanese Patent Laid-Open No. 08-287896

ところが、特許文献１に記載の端子構造では、内部端子、外部端子、絶縁部材、蓋体、パッキン及びナットが必要となり、比較的部品点数が多いものとなっており、組み付け作業性がよくなかった。   However, in the terminal structure described in Patent Document 1, an internal terminal, an external terminal, an insulating member, a lid, a packing, and a nut are required, and the number of parts is relatively large, and the assembling workability is not good. .

一方、特許文献２に記載のように、接続端子と蓋体等をインサート射出成形することで、電極構造の部品点数を減らすことも考えられるが、内部端子と外部端子の形状が複雑であるため、インサート射出成形する際の組み付け作業性が問題となった。   On the other hand, as described in Patent Document 2, it is conceivable to reduce the number of parts of the electrode structure by insert injection molding the connection terminal and the lid, but the shape of the internal terminal and the external terminal is complicated. Assembling workability at the time of insert injection molding became a problem.

この発明は上記事情に鑑みてなされたものであって、その目的は、部品点数を低減し、組み付けを簡易化した密閉型電池の端子構造を提供することにある。   The present invention has been made in view of the above circumstances, and an object thereof is to provide a terminal structure of a sealed battery in which the number of parts is reduced and the assembly is simplified.

上記目的を達成するために、請求項１に記載の発明は、外部端子と内部端子を含む密閉型電池の端子構造において、外部端子にかしめ用のリベットが一体的に設けられ、リベットを内部端子にかしめることにより、外部端子と内部端子を互いに接続するように構成したことを趣旨とする。   In order to achieve the above object, according to a first aspect of the present invention, there is provided a sealed battery terminal structure including an external terminal and an internal terminal, wherein the external terminal is integrally provided with a rivet for caulking, and the rivet is connected to the internal terminal. It is intended that the external terminal and the internal terminal are connected to each other by caulking.

上記発明の構成によれば、外部端子に一体に設けられたリベットを内部端子にかしめることにより、外部端子と内部端子が互いに接続される。従って、リベットのかしめだけで接続が行われ、外部端子と内部端子の接続のために他の部品が不要となる。   According to the above configuration, the external terminal and the internal terminal are connected to each other by caulking the rivet provided integrally with the external terminal to the internal terminal. Therefore, the connection is made only by rivet caulking, and no other parts are required for the connection between the external terminal and the internal terminal.

上記目的を達成するために、請求項２に記載の発明は、請求項１に記載の発明において、密閉型電池は、ケースと、ケースの開口を塞ぐ蓋とを含み、外部端子は、樹脂によるインサート成形により蓋に対して固定され、締結用の雄ネジと、蓋に対して回り止めとして機能する回り止め構造とを備えたことを趣旨とする。   In order to achieve the above object, according to a second aspect of the present invention, in the first aspect of the invention, the sealed battery includes a case and a lid that closes the opening of the case, and the external terminal is made of resin. It is intended to include a male screw for fastening, which is fixed to the lid by insert molding, and a detent structure that functions as a detent for the lid.

上記発明の構成によれば、請求項１に記載の発明の作用に加え、複数の密閉型電池の間で配線を締結するために、外部端子の雄ネジに配線が締結される。また、雄ネジへの配線の締結に際して、外部端子に加わる回転トルクに耐えられるよう回り止め構造が機能する。   According to the configuration of the invention, in addition to the operation of the invention according to claim 1, in order to fasten the wiring between the plurality of sealed batteries, the wiring is fastened to the male screw of the external terminal. In addition, the anti-rotation structure functions to withstand the rotational torque applied to the external terminal when the wiring is connected to the male screw.

請求項１に記載の発明によれば、密閉電池の端子構造につき、部品点数を低減することができ、組み付けを簡易化することができる。   According to the first aspect of the present invention, the number of parts can be reduced and the assembly can be simplified with respect to the terminal structure of the sealed battery.

請求項２に記載の発明によれば、請求項１に記載の発明の効果に加え、雄ネジとリブにより締結機能を確保することができる。   According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, the fastening function can be secured by the male screw and the rib.

一実施形態に係り、端子アッセンブリを示す正面図。The front view which concerns on one Embodiment and shows a terminal assembly. 同じく、端子アッセンブリの内部端子を分解した状態を示す正面図。Similarly, the front view which shows the state which decomposed | disassembled the internal terminal of the terminal assembly. 同じく、図２の負極内部端子の下方視図。Similarly, the bottom view of the negative electrode internal terminal of FIG. 同じく、図２の正極内部端子の下方視図。Similarly, the downward view of the positive electrode internal terminal of FIG. 同じく、蓋に固定された負極外部端子及び正極外部端子を示す正面図。Similarly, the front view which shows the negative electrode external terminal and positive electrode external terminal which were fixed to the lid | cover. 同じく、蓋に固定された負極外部端子及び正極外部端子を示す平面図。Similarly, the top view which shows the negative electrode external terminal and positive electrode external terminal which were fixed to the lid | cover. 同じく、蓋を示す平面図。Similarly, the top view which shows a lid | cover. 同じく、外部端子を示す正面図。Similarly, the front view which shows an external terminal. 同じく、図８の外部端子の下方視図。Similarly, the bottom view of the external terminal of FIG. 同じく、端子アッセンブリを含む密閉型電池を示す断面図。Similarly, sectional drawing which shows the sealed battery containing a terminal assembly.

以下、本発明の密閉型電池の端子構造を具体化した一実施形態につき図面を参照して詳細に説明する。   Hereinafter, an embodiment of a terminal structure of a sealed battery according to the present invention will be described in detail with reference to the drawings.

図１に、この実施形態の端子構造を具体化した端子アッセンブリ１を正面図により示す。図２に、端子アッセンブリ１の内部端子５，６を分解した状態を正面図により示す。端子アッセンブリ１は、密閉型電池を構成する長尺な蓋２と、その蓋２の一端部に固定された負極外部端子３と、蓋２の他端部に固定された正極外部端子４と、負極外部端子３の下端に取り付けられた負極内部端子５と、正極外部端子４の下端に取り付けられた正極内部端子６とを備える。   FIG. 1 is a front view of a terminal assembly 1 that embodies the terminal structure of this embodiment. FIG. 2 is a front view showing a state where the internal terminals 5 and 6 of the terminal assembly 1 are disassembled. The terminal assembly 1 includes a long lid 2 constituting a sealed battery, a negative external terminal 3 fixed to one end of the lid 2, a positive external terminal 4 fixed to the other end of the lid 2, The negative electrode internal terminal 5 attached to the lower end of the negative electrode external terminal 3 and the positive electrode internal terminal 6 attached to the lower end of the positive electrode external terminal 4 are provided.

図３に、図２の負極内部端子５の下方視図を示す。図４に、図２の正極内部端子６の下方視図を示す。負極内部端子５は、板材を折り曲げることで形成され、上端のベース部１１と、ベース部１１から下方へ延びる帯部１２とを含む。正極内部端子６も、同様に、上端に位置するベース部１１と、ベース板１１から下方へ延びる帯部１２とを含む。各内部端子５，６のベース部１１には、それぞれかしめ用の孔１３が形成される。   FIG. 3 shows a downward view of the negative electrode internal terminal 5 of FIG. FIG. 4 shows a downward view of the positive electrode internal terminal 6 of FIG. The negative electrode internal terminal 5 is formed by bending a plate material, and includes an upper end base portion 11 and a belt portion 12 extending downward from the base portion 11. Similarly, the positive electrode internal terminal 6 includes a base portion 11 located at the upper end and a belt portion 12 extending downward from the base plate 11. Caulking holes 13 are respectively formed in the base portions 11 of the internal terminals 5 and 6.

図５に、蓋２に固定された負極外部端子３及び正極外部端子４を正面図により示す。図６に、蓋２に固定された負極外部端子３及び正極外部端子４を平面図により示す。各外部端子３，４は、全体がほぼ軸形をなし、上方へ突出する雄ネジ１５と、雄ネジ１５の基端に形成されたフランジ１６とを備える。フランジ１６より下の部分が蓋２に対して樹脂１７によりインサート成形される。各外部端子３，４の下端には、下方へ突出したかしめ用のリベット１８が形成される。図２に示すように、このリベット１８が、対応する内部端子５，６の孔１３に挿入されてかしめられる。   FIG. 5 is a front view of the negative external terminal 3 and the positive external terminal 4 fixed to the lid 2. FIG. 6 is a plan view showing the negative external terminal 3 and the positive external terminal 4 fixed to the lid 2. Each of the external terminals 3 and 4 has a substantially axial shape as a whole, and includes a male screw 15 protruding upward and a flange 16 formed at the base end of the male screw 15. A portion below the flange 16 is insert-molded with the resin 17 with respect to the lid 2. A rivet 18 for caulking that protrudes downward is formed at the lower end of each external terminal 3, 4. As shown in FIG. 2, the rivet 18 is inserted into the hole 13 of the corresponding internal terminal 5 or 6 and crimped.

図７に、蓋２を平面図により示す。長尺な蓋２は、その両端部に外部端子用の円形の孔１９を含む。これら孔１９に、各外部端子３，４の下部が挿入され、樹脂１７によりインサート成形される。   FIG. 7 shows the lid 2 in a plan view. The long lid 2 includes circular holes 19 for external terminals at both ends thereof. The lower portions of the external terminals 3 and 4 are inserted into the holes 19 and are insert-molded with the resin 17.

図８に、外部端子３，４を正面図により示す。図９に、図８の外部端子３，４の下方視図を示す。各外部端子３，４は、フランジ１６の下方にシリンダ２０が形成される。シリンダ２０の周囲には、回り止め構造としての複数（この実施形態では「４つ」）のリブ２１が等角度間隔に形成される。シリンダ２０の下端には、上記したリベット１８が形成される。リベット１８の下面には、穴１８ａが形成される。   FIG. 8 is a front view of the external terminals 3 and 4. FIG. 9 shows a downward view of the external terminals 3 and 4 of FIG. Each external terminal 3, 4 is formed with a cylinder 20 below the flange 16. Around the cylinder 20, a plurality (“4” in this embodiment) of ribs 21 as anti-rotation structures are formed at equal angular intervals. The rivet 18 described above is formed at the lower end of the cylinder 20. A hole 18 a is formed in the lower surface of the rivet 18.

上記した正極外部端子４及び正極内部端子６の材料には、純アルミや３０００系が好ましい。負極外部端子３及び負極内部端子５の材料には、純銅が好ましい。蓋２の材料には、アルミが好ましい。   The material of the positive electrode external terminal 4 and the positive electrode internal terminal 6 described above is preferably pure aluminum or 3000 series. The material of the negative electrode external terminal 3 and the negative electrode internal terminal 5 is preferably pure copper. The material of the lid 2 is preferably aluminum.

図１に示す端子アッセンブリ１を得るには、先ず、各外部端子３，４のシリンダ２０の部分を蓋２の孔１９に挿入して、これらの部品２〜４を成形機にインサートした後、樹脂１７を射出成形する。樹脂１７の材料としては、耐薬品性のあるＰＰＳ、ＰＥＥＫ、フェノール及びエポキシ等が好ましい。蓋２及び各外部端子３，４と樹脂１７との接合性を考慮する際には、例えば、特公平５−５１６７１号公報等に記載された表面処理を施した後にインサート成形するのが好ましい。   In order to obtain the terminal assembly 1 shown in FIG. 1, first, the cylinder 20 portion of each of the external terminals 3 and 4 is inserted into the hole 19 of the lid 2, and these components 2 to 4 are inserted into the molding machine. Resin 17 is injection molded. As a material of the resin 17, chemical resistant PPS, PEEK, phenol, epoxy, and the like are preferable. When considering the bondability between the lid 2 and each external terminal 3, 4 and the resin 17, it is preferable to insert-mold after the surface treatment described in, for example, Japanese Patent Publication No. 5-51671.

そして、各外部端子３，４が蓋２に固定された後、各外部端子３，４のリベット１８を各内部端子５，６の孔１３に挿入してかしめることにより、各内部端子５，６を対応する外部端子３，４に取り付ける。これにより、図１に示すような端子アッセンブリ１が得られる。   Then, after the external terminals 3 and 4 are fixed to the lid 2, the rivets 18 of the external terminals 3 and 4 are inserted into the holes 13 of the internal terminals 5 and 6 and caulked to thereby form the internal terminals 5 and 5. 6 is attached to the corresponding external terminals 3 and 4. Thereby, the terminal assembly 1 as shown in FIG. 1 is obtained.

図１０に、上記した端子アッセンブリ１を含む密閉型電池２５を断面図により示す。この密閉型電池２５は、ケース２６と、ケース２６に収容された電極体２７と、上記した端子アッセンブリ１とを備える。電極体２７は、端子アッセンブリ１の両内部端子５，６に接続されて支持される。端子アッセンブリ１に電極体２７を支持した後、電極体２７をケース２６の上端開口からその内部に収容し、ケース２６と蓋体２をレーザ溶接等により固定することで、図１０に示すような密閉型電池２５が得られる。   FIG. 10 is a sectional view showing a sealed battery 25 including the terminal assembly 1 described above. The sealed battery 25 includes a case 26, an electrode body 27 accommodated in the case 26, and the terminal assembly 1 described above. The electrode body 27 is connected to and supported by the internal terminals 5 and 6 of the terminal assembly 1. After the electrode body 27 is supported on the terminal assembly 1, the electrode body 27 is accommodated in the inside thereof from the upper end opening of the case 26, and the case 26 and the lid body 2 are fixed by laser welding or the like, as shown in FIG. The sealed battery 25 is obtained.

以上説明したこの実施形態の端子構造によれば、端子アッセンブリ１を構成する外部端子３，４と内部端子５，６が、外部端子３，４に一体に設けられたリベット１８を、内部端子５，６に設けられた孔１３にかしめることにより、互いに接続される。従って、リベット１８をかしめるだけで外部端子３，４と内部端子５，６の接続が行われ、外部端子３，４と内部端子５，６の接続のために他の部品が不要となる。このため、この実施形態の端子アッセンブリ１によれば、従来例と比べて、部品点数を低減することができ、組み付けを簡易化することができる。   According to the terminal structure of this embodiment described above, the rivet 18 in which the external terminals 3 and 4 and the internal terminals 5 and 6 constituting the terminal assembly 1 are provided integrally with the external terminals 3 and 4 is connected to the internal terminal 5. , 6 to be connected to each other by caulking in holes 13. Accordingly, the external terminals 3 and 4 are connected to the internal terminals 5 and 6 simply by caulking the rivet 18, and other components are not required for connecting the external terminals 3 and 4 and the internal terminals 5 and 6. For this reason, according to the terminal assembly 1 of this embodiment, compared with a prior art example, a number of parts can be reduced and an assembly | attachment can be simplified.

具体的には、端子アッセンブリ１は、一つの蓋２と、２つの外部端子３，４と、２つの内部端子５，６を含むだけなので、部品点数が少なくて済む。また、外部端子３，４と蓋２を樹脂１７によりインサート成形する以外は、外部端子３，４と内部端子５，６をリベット１８によりかしめるだけの簡単な接続構造となっている。   Specifically, since the terminal assembly 1 includes only one lid 2, two external terminals 3 and 4, and two internal terminals 5 and 6, the number of parts can be reduced. In addition, the external terminals 3, 4 and the internal terminals 5, 6 are simply connected by a rivet 18 except that the external terminals 3, 4 and the lid 2 are insert-molded with a resin 17.

ここで、密閉型電池２５の端子アッセンブリ１としては、締結、集電及び導通の３機能が要求される。また、各外部端子３，４と蓋２を金型に入れて樹脂１７を射出することで一体化するインサート成形の工程では、ロボット等を使用して自動化することが要求される。このような課題に対し、この実施形態の端子構造では、締結機能と集電機能を分離させることで対応している。すなわち、複数の密閉型電池２５の間で配線を締結するには、各外部端子３，４の雄ネジ１５と、シリンダ２０のリブ２１が機能する。雄ネジ１５には配線がナットの締め付けにより締結される。このとき加わる回転トルクに耐えられるように、外部端子３，４のリブ２１が回り止めとして機能する。このように、雄ネジ１５とリブ２１により締結機能を確保することができる。また、集電は、蓋２に固定された各外部端子３，４に対して、後から内部端子５，６をかしめて接続することで機能する。また、蓋２とインサート成形される外部端子３，４の形状を比較的簡略化し、蓋２の孔１９に挿入するだけの構成としたので、このインサート成形の工程にロボット等を使用した自動化が容易となる。   Here, the terminal assembly 1 of the sealed battery 25 is required to have three functions of fastening, current collection and conduction. Further, in the insert molding process in which the external terminals 3 and 4 and the lid 2 are integrated by injecting the resin 17 into the mold, it is required to be automated using a robot or the like. In response to such a problem, the terminal structure of this embodiment addresses this problem by separating the fastening function and the current collecting function. That is, in order to fasten the wiring between the plurality of sealed batteries 25, the male screw 15 of each of the external terminals 3 and 4 and the rib 21 of the cylinder 20 function. A wiring is fastened to the male screw 15 by tightening a nut. The ribs 21 of the external terminals 3 and 4 function as detents so as to withstand the rotational torque applied at this time. Thus, the fastening function can be secured by the male screw 15 and the rib 21. The current collection functions by caulking and connecting the internal terminals 5 and 6 to the external terminals 3 and 4 fixed to the lid 2 later. Moreover, since the shape of the lid 2 and the external terminals 3 and 4 to be insert-molded is relatively simplified and only inserted into the hole 19 of the lid 2, automation using a robot or the like is possible for this insert-molding process. It becomes easy.

なお、この発明は前記実施形態に限定されるものではなく、発明の趣旨を逸脱することのない範囲で構成の一部を適宜変更して実施することもできる。   In addition, this invention is not limited to the said embodiment, A part of structure can also be changed suitably and implemented in the range which does not deviate from the meaning of invention.

例えば、前記実施形態では、蓋２に形成された孔１９を円形としたが、この孔の形状を外部端子３，４に形成されたリブ２１の形状に整合した形状にすることもできる。   For example, in the above-described embodiment, the hole 19 formed in the lid 2 is circular, but the shape of the hole may be matched with the shape of the rib 21 formed in the external terminals 3 and 4.

この発明は、リチウムイオン二次電池等の密閉型電池に利用することができる。   The present invention can be used for a sealed battery such as a lithium ion secondary battery.

１ 端子アッセンブリ
２ 蓋
３ 負極外部端子
４ 正極外部端子
５ 負極内部端子
６ 正極内部端子
１３ 孔
１５ 雄ネジ
１８ リベット
２１ リブ
２５ 密閉型電池 1 Terminal assembly 2 Lid 3 Negative external terminal 4 Positive external terminal 5 Negative internal terminal 6 Positive internal terminal 13 Hole 15 Male screw 18 Rivet 21 Rib 25 Sealed battery

Claims (2)

外部端子と内部端子を含む密閉型電池の端子構造において、
前記外部端子にかしめ用のリベットが一体的に設けられ、前記リベットを前記内部端子にかしめることにより、前記外部端子と前記内部端子を互いに接続するように構成したことを特徴とする密閉型電池の端子構造。 In the terminal structure of a sealed battery including external terminals and internal terminals,
A sealed battery characterized in that a rivet for caulking is integrally provided on the external terminal, and the external terminal and the internal terminal are connected to each other by caulking the rivet to the internal terminal. Terminal structure. 前記密閉型電池は、ケースと、前記ケースの開口を塞ぐ蓋とを含み、前記外部端子は、樹脂によるインサート成形により前記蓋に対して固定され、締結用の雄ネジと、前記蓋に対して回り止めとして機能する回り止め構造とを備えたことを特徴とする請求項１に記載の密閉型電池の端子構造。 The sealed battery includes a case and a lid that closes the opening of the case, and the external terminal is fixed to the lid by insert molding with resin, and is connected to a male screw for fastening and the lid The terminal structure for a sealed battery according to claim 1, further comprising a detent structure that functions as a detent.
JP2009057458A 2009-03-11 2009-03-11 Sealed battery terminal structure Expired - Fee Related JP5446339B2 (en)

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