JP5639558B2 - Coupling structure of metal plate and metal shaft and electrode structure of sealed battery - Google Patents

Coupling structure of metal plate and metal shaft and electrode structure of sealed battery Download PDF

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JP5639558B2
JP5639558B2 JP2011214985A JP2011214985A JP5639558B2 JP 5639558 B2 JP5639558 B2 JP 5639558B2 JP 2011214985 A JP2011214985 A JP 2011214985A JP 2011214985 A JP2011214985 A JP 2011214985A JP 5639558 B2 JP5639558 B2 JP 5639558B2
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metal plate
press
bottomed hole
metal
metal shaft
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JP2013075297A (en
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明裕 榎本
明裕 榎本
武幸 徳永
武幸 徳永
浩明 高島
浩明 高島
賢一 蓮本
賢一 蓮本
操 平川
操 平川
達也 川本
達也 川本
小林　司
司 小林
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SEL JAPAN CO, LTD.
Techno Associe Co Ltd
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SEL JAPAN CO, LTD.
Techno Associe Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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Description

本発明は、金属板と金属軸の結合構造、及びこれを用いた密閉型電池の電極構造に関する。   The present invention relates to a coupling structure of a metal plate and a metal shaft, and an electrode structure of a sealed battery using the same.

近年、車両搭載用電源として、軽量で高エネルギー密度が得られるリチウムイオン電池等の密閉型電池が注目されている。例えば特許文献１では、電極体及び電解質が電池ケース内に収容され、軸状の電極端子が、電池ケースに設けられた端子貫通孔と、電池ケースの表面に配置された金属板からなる外部端子に設けられた端子貫通孔とを順次に貫通して、ケースの内部から外部に引き出されている。しかしながら、金属板にも端子挿通孔が設けられているため、電池ケース内部の電解質等の外部への漏れ出しを抑制するためのシール構造が複雑になるという問題がある。   In recent years, a sealed battery such as a lithium ion battery that is lightweight and has a high energy density has attracted attention as a power source for mounting on a vehicle. For example, in Patent Document 1, an electrode body and an electrolyte are accommodated in a battery case, and an axial electrode terminal is an external terminal composed of a terminal through hole provided in the battery case and a metal plate disposed on the surface of the battery case. The terminal through-holes provided in the case are sequentially passed through and drawn out from the inside of the case. However, since the metal plate is also provided with the terminal insertion hole, there is a problem that the seal structure for suppressing leakage of the electrolyte inside the battery case to the outside is complicated.

ところで、金属板の貫通孔に金属軸を結合する技術としては、金属板の貫通孔に金属軸の小径端部を挿通させて、その小径端部の先端を僅かに金属板の表面より突出させ、その突出させた先端をプレスで押し潰して貫通孔の周縁に係合させる、かしめ法が一般的である。
一方、金属板に貫通孔を設けないで金属軸をかしめる技術が提案されている。例えば、特許文献２では、外周に多数の微小な縦溝やこれと交差する横溝を形成したり、あるいは文目のローレットを形成したりした金属軸の端部を、金属板の有底孔に押し込むとともに、金属軸の端部の外周に嵌合した筒状のカシメポンチを金属軸に沿って移動させることにより、金属板において有底孔の縁部を形成していた肉を、金属軸の縦溝や横溝に押入する技術が提案されている。他方、金属板の表面に金属軸の端面を当接させて、その当接面を溶融させて結合する溶接法がある。 By the way, as a technique for coupling the metal shaft to the through hole of the metal plate, the small diameter end portion of the metal shaft is inserted into the through hole of the metal plate, and the tip of the small diameter end portion is slightly protruded from the surface of the metal plate. The caulking method is generally used in which the projected tip is crushed by a press and engaged with the periphery of the through hole.
On the other hand, a technique for caulking a metal shaft without providing a through hole in a metal plate has been proposed. For example, in Patent Document 2, the end of the metal shaft, in which a large number of minute vertical grooves and transverse grooves intersecting with this are formed on the outer periphery, or a knurled line is formed on the bottomed hole of the metal plate. At the same time, the cylindrical caulking punch fitted to the outer periphery of the end of the metal shaft is moved along the metal shaft, so that the meat that forms the edge of the bottomed hole in the metal plate is Techniques for pushing into grooves and transverse grooves have been proposed. On the other hand, there is a welding method in which the end surface of the metal shaft is brought into contact with the surface of the metal plate, and the contact surface is melted and joined.

特開２０１０−２８２８４８号公報JP 2010-282848 A 特開昭５９−１４７７２４号公報JP 59-147724 A

前記の溶接法では、熱歪み等の影響があるうえに金属軸の溶け込み量が一定でないため、金属板に対する金属軸の位置精度があまり良くない。また、製造コストが高い。
特許文献２では、下記の欠点がある。すなわち、車両に搭載される等で振動等の過酷な条件を考慮する必要がある場合、微小な縦溝やローレットでは、振動等の影響で、金属軸に緩みを生ずるおそれがある。また、カシメパンチを用いるため、金属軸とカシメパンチの位置精度のばらつきがカシメ量に影響し、金属板に対する金属軸の位置精度が悪くなるおそれがある。さらに、定期的にカシメパンチを新品と交換する必要があり、製造コストが高くなる。 In the above-described welding method, there is an influence of thermal distortion and the like, and the amount of penetration of the metal shaft is not constant, so the position accuracy of the metal shaft with respect to the metal plate is not very good. Moreover, the manufacturing cost is high.
Patent Document 2 has the following drawbacks. That is, when it is necessary to consider severe conditions such as vibration when mounted on a vehicle or the like, a minute vertical groove or knurled may cause loosening of the metal shaft due to the influence of vibration or the like. In addition, since the caulking punch is used, variation in the positional accuracy between the metal shaft and the caulking punch affects the caulking amount, and the positional accuracy of the metal shaft with respect to the metal plate may be deteriorated. Furthermore, it is necessary to periodically replace the caulking punch with a new one, which increases the manufacturing cost.

そこで、本発明の目的は、結合力が高く、位置精度に優れ且つ安価である、金属板と金属軸の結合構造、及びこれを含む密閉型電池の電極構造を提供することである。   Accordingly, an object of the present invention is to provide a metal plate / metal shaft coupling structure and a sealed battery electrode structure including the same, which have a high coupling force, excellent positional accuracy, and are inexpensive.

上記目的を達成するため、請求項１の発明は、互いに平行な第１面（２）及び第２面（３）を有し、前記第１面に有底孔（４）が形成された金属板（１；１Ａ）と、前記有底孔に圧入された金属軸（５；５Ａ）と、を備え、前記金属軸は、前記第１面に当接して前記第１面の変形を拘束した肩部（８）を有する主体部（６）と、前記有底孔に圧入された圧入端部（７）と、を含み、前記圧入端部は、前記主体部に隣接して設けられ前記主体部の軸方向（Ｘ１）の投影空間内に配置された多角形部（９）と、前記有底孔の底（４２）に当接した端面（１０２）を有し前記多角形部の軸方向の投影空間内に配置されたテーパ状の案内部（１０）と、前記案内部と前記多角形部とを接続し前記案内部と前記多角形部との間にくびれ空間（Ｓ１）を形成する細径部（１１）と、を含み、前記多角形部は、前記有底孔の入口縁部（４１）を前記第２面側へ塑性変形させて前記入口縁部に食い込んでおり、前記金属板は、前記くびれ空間に入り込んだ塑性変形部（１２）を含み、前記金属板の第２面において、前記案内部の軸方向の投影空間外に、前記多角形部の圧入による塑性変形痕（１３）が視認可能に形成されている、金属板と金属軸の結合構造（Ａ）を提供する。 To achieve the above object, the invention of claim 1 is a metal having a first surface (2) and a second surface (3) parallel to each other, and a bottomed hole (4) is formed in the first surface. A plate (1; 1A) and a metal shaft (5; 5A) press-fitted into the bottomed hole, and the metal shaft is in contact with the first surface and restrains deformation of the first surface. A main body portion (6) having a shoulder portion (8), and a press-fit end portion (7) press-fitted into the bottomed hole, wherein the press-fit end portion is provided adjacent to the main body portion and the main body A polygonal part (9) arranged in the projection space in the axial direction (X1) of the part and an end surface (102) in contact with the bottom (42) of the bottomed hole, the axial direction of the polygonal part A tapered guide portion (10) disposed in the projection space of the guide portion and the guide portion and the polygonal portion are connected to form a constricted space (S1) between the guide portion and the polygonal portion. And the polygonal part bites into the inlet edge by plastically deforming the inlet edge (41) of the bottomed hole to the second surface side, metal plate, said constricted saw including a plastically deformed portion (12) having entered the space, the second surface of the metal plate, outside the projection space in the axial direction of the guide portion, the plastic deformation by press-fitting of the polygonal section Provided is a coupling structure (A) of a metal plate and a metal shaft, in which a mark (13) is formed so as to be visible .

なお、括弧内の英数字は、後述する実施形態における対応構成要素等を表すが、このことは、むろん、本発明がそれらの実施形態に限定されるべきことを意味するものではない。以下、この項において同じ。
また、請求項２のように、前記くびれ空間を区画する、前記多角形部の区画面（９１）が、第１面に平行な平坦面であってもよい。 In addition, although the alphanumeric character in a parenthesis represents the corresponding component etc. in embodiment mentioned later, this does not mean that this invention should be limited to those embodiment as a matter of course. The same applies hereinafter.
Moreover, the flat screen parallel to the 1st surface may be sufficient as the division screen (91) of the said polygon part which divides the said constriction space like Claim 2.

また、請求項３のように、前記くびれ空間を区画する、前記案内部の区画面（１０１）が、第１面に平行な平坦面であってもよい。 According to a third aspect of the present invention, the section screen (101) of the guide section that divides the constricted space may be a flat surface parallel to the first surface .

また、請求項４の発明は、第１面としての裏面及び第２面としての表面を有し、前記裏面に有底孔が形成された外部端子としての金属板（１Ａ）と、電池ケース（２１）内から引き出され、前記有底孔に圧入された内部端子としての金属軸（５Ａ）とを備え、前記金属軸は、前記第１面に当接して前記第１面の変形を拘束した肩部を有する主体部と、前記有底孔に圧入された圧入端部と、を含み、前記圧入端部は、前記主体部に隣接して設けられ前記主体部の軸方向の投影空間内に配置された多角形部と、前記有底孔の底に当接した端面を有し前記多角形部の軸方向の投影空間内に配置されたテーパ状の案内部と、前記案内部と前記多角形部とを接続し前記案内部と前記多角形部との間にくびれ空間を形成する細径部と、を含み、前記多角形部は、前記有底孔の入口縁部を前記第２面側へ塑性変形させて前記入口縁部に食い込んでおり、前記金属板は、前記くびれ空間に入り込んだ塑性変形部を含む、密閉型電池（２０）の電極構造（Ｂ）を提供する。 According to a fourth aspect of the present invention, there is provided a metal plate (1A) as an external terminal having a back surface as a first surface and a front surface as a second surface and having a bottomed hole formed in the back surface, and a battery case ( 21) A metal shaft (5A) as an internal terminal drawn out from the inside and press-fitted into the bottomed hole, and the metal shaft is in contact with the first surface and restrains deformation of the first surface. A main body portion having a shoulder portion and a press-fit end portion press-fitted into the bottomed hole, the press-fit end portion being provided adjacent to the main body portion and in an axial projection space of the main body portion A polygonal portion disposed; a tapered guide portion having an end surface in contact with the bottom of the bottomed hole; and disposed in a projection space in an axial direction of the polygonal portion; the guide portion; A narrow-diameter portion connecting a square portion and forming a constricted space between the guide portion and the polygon portion, and the polygon Encloses the inlet edge of the bottomed hole plastically toward the second surface and bites into the inlet edge, and the metal plate includes a plastically deformed part that enters the constricted space. (20) An electrode structure (B) is provided.

請求項１の発明によれば、金属軸のくびれ空間に金属板の塑性変形部が入りこんで金属軸の軸方向への抜脱を防止しているとともに、多角形部が金属板の有底孔の入口縁部に食い込んで金属軸の回転を確実に規制しているので、金属板に対する金属軸の結合力を格段に高くすることができる。
また、金属軸の多角形部自体が、有底孔の入口縁部に食い込むので、当該入口縁部を圧入方向に押圧するための別途の治具（例えば特許文献２のカシメパンチ）が不要である。したがって、特許文献２のようにカシメパンチと軸との位置精度のばらつきの影響を受けないので、かしめ量の精度が良く、その結果、金属板に対する金属軸の位置精度を良くすることができる。また、カシメパンチの交換等が不要であり、製造コストを安くすることができる。
また、金属板の第２面において、案内部の軸方向の投影空間外に、多角形部の圧入による塑性変形痕が視認可能に形成されるので、圧入工程に関する検査を省略することが可能となり、製造コストを安くすることかできる。 According to the first aspect of the present invention, the plastic deformation portion of the metal plate enters the constricted space of the metal shaft to prevent the metal shaft from being pulled out in the axial direction, and the polygonal portion is a bottomed hole of the metal plate. Since the rotation of the metal shaft is reliably regulated by biting into the entrance edge of the metal plate, the coupling force of the metal shaft to the metal plate can be remarkably increased.
Further, since the polygonal portion of the metal shaft itself bites into the inlet edge of the bottomed hole, a separate jig for pressing the inlet edge in the press-fitting direction (for example, a caulking punch in Patent Document 2) is unnecessary. . Therefore, unlike Patent Document 2, it is not affected by variations in the positional accuracy between the caulking punch and the shaft, so that the accuracy of the caulking amount is good, and as a result, the positional accuracy of the metal shaft with respect to the metal plate can be improved. Further, it is not necessary to replace the caulking punch, and the manufacturing cost can be reduced.
In addition, on the second surface of the metal plate, plastic deformation marks due to the press-fitting of the polygonal part are formed so as to be visible outside the projection space in the axial direction of the guide part, so that it is possible to omit the inspection relating to the press-fitting process. Manufacturing costs can be reduced.

さらに、金属板の孔を有底孔としてあるので、金属板の表裏でシール性が要求される場合に、好適に用いることができる。
請求項２の発明によれば、くびれ空間を区画する多角形部の区画面を、第１面に平行な平坦面としたので、金属板に対する金属軸の直角度を精度良く実現することができる。
請求項３の発明によれば、くびれ空間を区画する案内部の区画面を、第１面に平行な平坦面としたので、金属板に対する金属軸の直角度を実現することができる。 Furthermore, since the hole of the metal plate is a bottomed hole, it can be suitably used when sealing properties are required on the front and back of the metal plate.
According to the invention of claim 2, since the section screen of the polygonal section that divides the constricted space is a flat surface parallel to the first surface, the squareness of the metal axis with respect to the metal plate can be realized with high accuracy. .
According to the invention of claim 3, since the section screen of the guide section that divides the constricted space is a flat surface parallel to the first surface, the squareness of the metal axis with respect to the metal plate can be realized.

請求項４の発明によれば、請求項１と同じ効果を奏することができる。すなわち、外部端子（金属板）に対する内部端子（金属軸）の結合力が高く、また、外部端子（金属板）に対する内部端子（金属軸）の位置精度が高く、しかも製造コストを安くすることができる。また、金属板に端子貫通孔を設けないので、内部の電解質等の漏れ出しを防ぐためのシール構造を簡素化することができる密閉型電池の電極構造を実現することができる。 According to the invention of claim 4, the same effect as that of claim 1 can be obtained. That is, the coupling force of the internal terminal (metal shaft) with respect to the external terminal (metal plate) is high, the positional accuracy of the internal terminal (metal shaft) with respect to the external terminal (metal plate) is high, and the manufacturing cost can be reduced. it can. Moreover, since the terminal through hole is not provided in the metal plate, it is possible to realize an electrode structure of a sealed battery that can simplify a sealing structure for preventing leakage of an internal electrolyte or the like.

本発明の一実施形態に係る、金属板と金属軸の結合構造の部分破断正面図である。It is a partial fracture front view of the connection structure of a metal plate and a metal axis concerning one embodiment of the present invention. 金属板と金属軸の結合前の分解斜視図である。It is a disassembled perspective view before the coupling | bonding of a metal plate and a metal shaft. 図３（ａ）は金属軸の側面図であり、図３（ｂ）は金属軸の正面図である。FIG. 3A is a side view of the metal shaft, and FIG. 3B is a front view of the metal shaft. 図４（ａ）は、図３（ａ）とは別角度から見た金属軸の側面図であり、図４（ｂ）は、図４（ｂ）とは別角度から見た金属軸の側面図である。4A is a side view of the metal shaft viewed from a different angle from FIG. 3A, and FIG. 4B is a side view of the metal shaft viewed from a different angle from FIG. 4B. FIG. 図５（ａ）〜（ｃ）は金属板と金属軸を結合する工程を順次に示す部分断面正面図である。FIGS. 5A to 5C are partial cross-sectional front views sequentially showing steps of joining the metal plate and the metal shaft. 結合後の金属板の表面の概略図である。It is the schematic of the surface of the metal plate after a coupling | bonding. 本発明の別の実施形態に係る密閉型電池の概略斜視図である。It is a schematic perspective view of the sealed battery which concerns on another embodiment of this invention. 図７の密閉型電池の電極構造の断面図である。It is sectional drawing of the electrode structure of the sealed battery of FIG.

本発明の好ましい態様を添付図面を参照しつつ説明する。
図１は本発明の一実施形態の金属板と金属軸の結合構造Ａの部分断面正面図である。図１を参照して、金属板１は、板厚方向Ｔ１に対向する互いに平行な第１面２と第２面３とを有している。金属板１の第１面２には、有底孔４が形成されている。図２に示すように、金属板１の第１面２の有底孔４に、金属軸５が圧入されて、図１に示した、金属板と金属軸の結合構造Ａが構成されている。金属板１は、例えばアルミニウムにより構成され、金属軸５は、例えば銅により構成されており、両者の硬度が比較的近い。 Preferred embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a partial sectional front view of a metal plate / metal shaft coupling structure A according to an embodiment of the present invention. With reference to FIG. 1, the metal plate 1 has the 1st surface 2 and the 2nd surface 3 which are mutually parallel and oppose the plate | board thickness direction T1. A bottomed hole 4 is formed in the first surface 2 of the metal plate 1. As shown in FIG. 2, the metal shaft 5 is press-fitted into the bottomed hole 4 of the first surface 2 of the metal plate 1, so that the metal plate-metal shaft coupling structure A shown in FIG. 1 is configured. . The metal plate 1 is made of, for example, aluminum, and the metal shaft 5 is made of, for example, copper, and the hardness of both is relatively close.

図１、図２、図３（ａ）及び（ｂ）、並びに図４（ａ）及び（ｂ）に示すように、金属軸５は、中空丸棒状の主体部６と、有底孔４に圧入された圧入端部７とを備えている。金属軸５の主体部６は、金属板１の第１面２に当接して第１面２の変形を拘束した肩部８を有している。肩部８は第１面２に平行な平坦面に形成されている。主体部６の中空部は、圧入端部７とは反対側に開放されている。   As shown in FIGS. 1, 2, 3 (a) and 3 (b) and FIGS. 4 (a) and 4 (b), the metal shaft 5 is formed in a hollow round bar-shaped main body 6 and a bottomed hole 4. And a press-fit end 7 that is press-fitted. The main portion 6 of the metal shaft 5 has a shoulder portion 8 that abuts against the first surface 2 of the metal plate 1 and restrains deformation of the first surface 2. The shoulder 8 is formed on a flat surface parallel to the first surface 2. The hollow portion of the main body portion 6 is opened to the side opposite to the press-fit end portion 7.

圧入端部７は、例えば略矩形の多角形部９と、テーパ状の案内部１０と、細径部１１とを、主体部６から金属軸５の先端側に向けて順次に有している。多角形部９は、主体部６に隣接して設けられ、図３（ａ）及び図４（ａ）に示すように、主体部６の軸方向Ｘ１の投影空間内に配置されている。多角形部９は、図１に示すように、有底孔４の入口縁部４１を第２面３側へ塑性変形させて入口縁部４１に食い込んでいる。本実施の形態では、多角形部が略矩形であるが、三角形であってもよいし、五角形以上であってもよい。   The press-fit end portion 7 has, for example, a substantially rectangular polygonal portion 9, a tapered guide portion 10, and a small diameter portion 11 sequentially from the main body portion 6 toward the tip end side of the metal shaft 5. . The polygonal portion 9 is provided adjacent to the main body 6 and is disposed in the projection space in the axial direction X1 of the main body 6 as shown in FIGS. 3 (a) and 4 (a). As shown in FIG. 1, the polygonal portion 9 bites into the inlet edge 41 by plastically deforming the inlet edge 41 of the bottomed hole 4 toward the second surface 3. In the present embodiment, the polygonal portion is substantially rectangular, but it may be a triangle or a pentagon or more.

細径部１１は、多角形部９と案内部１０とを接続し、多角形部９と案内部１０との間に、くびれ空間Ｓ１を形成している。金属板１は、くびれ空間Ｓ１に入り込んだ塑性変形部１２を含んでいる。くびれ空間Ｓ１を区画する、多角形部９の区画面９１及び案内部１０の区画面１０１は、第１面２に平行な平坦面により形成されている。
案内部１０は、図１に示すように、有底孔４の底４２に当接した端面１０２を有し、図３（ａ）及び図４（ａ）に示すように、多角形部９の軸方向Ｘ１の投影空間内に配置されている。有底孔４の底４２及び案内部１０の端面１０２は、第１面２に平行な平坦面により形成されている。 The small-diameter portion 11 connects the polygonal portion 9 and the guide portion 10, and forms a constricted space S <b> 1 between the polygonal portion 9 and the guide portion 10. The metal plate 1 includes a plastic deformation portion 12 that has entered the constricted space S1. The section screen 91 of the polygonal section 9 and the section screen 101 of the guide section 10 that define the constricted space S <b> 1 are formed by flat surfaces parallel to the first surface 2.
As shown in FIG. 1, the guide portion 10 has an end face 102 that is in contact with the bottom 42 of the bottomed hole 4, and as shown in FIGS. 3 (a) and 4 (a), the polygonal portion 9. It is arranged in the projection space in the axial direction X1. The bottom 42 of the bottomed hole 4 and the end surface 102 of the guide portion 10 are formed by flat surfaces parallel to the first surface 2.

中空丸棒状の主体部６の直径は、例えば４〜６ｍｍの範囲内の所定値が採用されている。案内部１０の直径は、例えば３〜４ｍｍの範囲内の所定値が採用されている。略矩形をなす多角形部９の一辺の長さは、案内部１０の直径と例えば略等しくされている。圧入端部７の高さ（軸長）は、金属板１の板厚（例えば２〜３ｍｍ）よりも、例えば０．４〜０．６ｍｍ程度小さくされている。多角形部９の高さ（軸長）は、圧入端部７の高さ（軸長）の例えば１／２に設定されている。細径部１１の直径は、案内部１０の直径よりも例えば１〜２ｍｍ程度小さくされている。細径部１１の軸長は、例えば０．４〜０．５ｍｍとされている。   A predetermined value within a range of 4 to 6 mm, for example, is employed as the diameter of the hollow round bar-shaped main body 6. As the diameter of the guide portion 10, a predetermined value within a range of 3 to 4 mm, for example, is adopted. For example, the length of one side of the polygonal portion 9 forming a substantially rectangular shape is substantially equal to the diameter of the guide portion 10. The height (axial length) of the press-fit end portion 7 is set to be, for example, about 0.4 to 0.6 mm smaller than the plate thickness (for example, 2 to 3 mm) of the metal plate 1. The height (axial length) of the polygonal portion 9 is set to, for example, ½ of the height (axial length) of the press-fit end portion 7. The diameter of the small diameter part 11 is made smaller than the diameter of the guide part 10 by about 1-2 mm, for example. The axial length of the small diameter part 11 is 0.4 to 0.5 mm, for example.

次いで、図５（ａ）〜（ｃ）は金属板１と金属軸５とを結合させる工程を順次に示している。図５においての上下は実際の上下とは逆であってもよい。図５（ａ）に示すように、図示しないプレス機械の受け部によって第２面３が受けられた状態の金属板１の有底孔４に、金属軸５を圧入端部７側からプレスにより押し込む。金属軸５が圧入される前の有底孔４の直径Ｄ１は、案内部１０の直径Ｄ２と同等かまたは若干大きく設定されている（Ｄ１≧Ｄ２）。また、金属軸５が圧入される前の有底孔４の直径Ｄ１は、多角形部の外接円の直径Ｄ３と同等または若干小さくされている（Ｄ１≦Ｄ３）。   Next, FIGS. 5A to 5C sequentially show the process of joining the metal plate 1 and the metal shaft 5 together. The upper and lower sides in FIG. 5 may be opposite to the actual vertical direction. As shown in FIG. 5A, the metal shaft 5 is pressed from the press-fit end portion 7 side into the bottomed hole 4 of the metal plate 1 in a state where the second surface 3 is received by a receiving portion of a press machine (not shown). Push in. The diameter D1 of the bottomed hole 4 before the metal shaft 5 is press-fitted is set to be equal to or slightly larger than the diameter D2 of the guide portion 10 (D1 ≧ D2). Further, the diameter D1 of the bottomed hole 4 before the metal shaft 5 is press-fitted is equal to or slightly smaller than the diameter D3 of the circumscribed circle of the polygonal part (D1 ≦ D3).

したがって、図５（ｂ）に示すように、圧入端部７が有底孔４に押し込まれる途中の段階で、多角形部９により押された有底孔４の入口縁部４１周辺の肉が、くびれ空間Ｓ１内に流れ込んで来る。
次いで、図５（ｃ）に示すように、十分な量の肉が、多角形部９と案内部１０との間のくびれ空間Ｓ１に入り込んだ状態で、案内部１０の平坦面からなる端面１０２が、有底孔４の底４２に当接することにより、金属軸５の圧入が完了し、金属板と軸の結合構造Ａが完成する。 Therefore, as shown in FIG. 5 (b), when the press-fit end 7 is being pushed into the bottomed hole 4, the meat around the inlet edge 41 of the bottomed hole 4 pushed by the polygonal part 9 is removed. , Flows into the constricted space S1.
Next, as shown in FIG. 5 (c), a sufficient amount of meat enters the constricted space S 1 between the polygonal portion 9 and the guide portion 10, and the end face 102 made of a flat surface of the guide portion 10. However, by abutting against the bottom 42 of the bottomed hole 4, the press-fitting of the metal shaft 5 is completed, and the metal plate / shaft coupling structure A is completed.

図６に示すように、圧入完了後の金属板１の第２面３において、案内部１０の軸方向Ｘ１（図６において、紙面に直交する方向）の投影空間Ｐ外に、多角形部９の圧入による塑性変形痕１３が視認可能に形成されている。塑性変形痕１３は、第２面３の光沢に変化が見て取れる程度であり、第２面３の平面度としては、例えば５／１００以下の精度が維持されている。   As shown in FIG. 6, on the second surface 3 of the metal plate 1 after completion of press-fitting, the polygonal portion 9 is outside the projection space P in the axial direction X1 of the guide portion 10 (the direction orthogonal to the paper surface in FIG. 6). The plastic deformation trace 13 due to the press-fitting is formed so as to be visible. The plastic deformation trace 13 is such that a change in the gloss of the second surface 3 can be seen, and the flatness of the second surface 3 is maintained at, for example, an accuracy of 5/100 or less.

本実施の形態によれば、図１に示すように、金属軸５のくびれ空間Ｓ１に金属板１の塑性変形部１２が入りこんで金属軸５の軸方向Ｘ１への抜脱を防止しているとともに、多角形部９が金属板１の有底孔４の入口縁部４１に食い込んで金属軸５の回転を確実に規制しているので、金属板１に対する金属軸５の結合力を格段に高くすることができる。
また、金属軸５の多角形部９自体が、有底孔４の入口縁部４１に食い込むので、当該入口縁部４１を圧入方向に押圧するための別途の治具（例えば特許文献２のカシメパンチ）が不要である。したがって、特許文献２のようにカシメパンチと軸との位置精度のばらつきの影響を受けないので、かしめ量の精度が良く、その結果、金属板１に対する金属軸５の位置精度を良くすることができる。また、カシメパンチの交換等が不要であり、製造コストを安くすることができる。 According to the present embodiment, as shown in FIG. 1, the plastic deformation portion 12 of the metal plate 1 enters the constricted space S1 of the metal shaft 5 to prevent the metal shaft 5 from being pulled out in the axial direction X1. At the same time, since the polygonal portion 9 bites into the inlet edge 41 of the bottomed hole 4 of the metal plate 1 and reliably controls the rotation of the metal shaft 5, the coupling force of the metal shaft 5 to the metal plate 1 is markedly increased. Can be high.
Further, since the polygonal portion 9 itself of the metal shaft 5 bites into the inlet edge 41 of the bottomed hole 4, a separate jig for pressing the inlet edge 41 in the press-fitting direction (for example, the caulking punch of Patent Document 2) ) Is not required. Therefore, unlike Patent Document 2, it is not affected by variations in the positional accuracy between the caulking punch and the shaft, so that the accuracy of the caulking amount is good, and as a result, the positional accuracy of the metal shaft 5 with respect to the metal plate 1 can be improved. . Further, it is not necessary to replace the caulking punch, and the manufacturing cost can be reduced.

さらに、金属板１の孔を有底孔４としてあるので、金属板１の表裏でシール性が要求される場合に、好適に用いることができる。
また、くびれ空間Ｓ１を区画する多角形部９の区画面９１を、第１面２に平行な平坦面としたので、金属板１に対する金属軸５の直角度を精度良く実現することができる。また、くびれ空間Ｓ１を区画する案内部１０の区画面１０１を、第１面２に平行な平坦面としたので、この点からも、金属板１に対する金属軸５の直角度を精度良く実現することができる。また、有底孔４の底４２及び案内部１０の端面１０２を、第１面２に平行な平坦面としたので、この点からも、金属板１に対する金属軸５の直角度を精度良く実現することができる。 Furthermore, since the hole of the metal plate 1 is the bottomed hole 4, it can be suitably used when sealing properties are required on the front and back of the metal plate 1.
Moreover, since the section screen 91 of the polygonal part 9 that partitions the constricted space S1 is a flat surface parallel to the first surface 2, the squareness of the metal shaft 5 with respect to the metal plate 1 can be realized with high accuracy. Moreover, since the section screen 101 of the guide portion 10 that partitions the constricted space S1 is a flat surface parallel to the first surface 2, the squareness of the metal shaft 5 with respect to the metal plate 1 can be accurately realized from this point. be able to. Further, since the bottom 42 of the bottomed hole 4 and the end surface 102 of the guide portion 10 are flat surfaces parallel to the first surface 2, the squareness of the metal shaft 5 with respect to the metal plate 1 can be accurately realized from this point. can do.

また、図６に示すように、金属板１の第２面３において、案内部１０の軸方向Ｘ１の投影空間外に、多角形部９の圧入による塑性変形痕１３が視認可能に形成されるので、圧入工程に関する検査を省略することが可能となり、製造コストを安くすることかできる。
次いで、図７は金属板と金属軸の結合構造Ａが適用された密閉型電池の電極構造Ｂを示している。図７に示すように、密閉型電池２０は、例えば直方体形状をなす外装容器しての電池ケース２１と、電池ケース２１の端子配置面２２に配置された一対の外部端子としての金属板１Ａと、金属板１Ａの表面としての第２面３に突出形成された電極棒２３とを備えている。一方の金属板１Ａとこれに形成された電極棒２３が正極を構成し、他方の金属板１Ａとこれに形成された電極棒２３が負極を構成している。 Further, as shown in FIG. 6, on the second surface 3 of the metal plate 1, a plastic deformation mark 13 due to the press-fitting of the polygonal portion 9 is formed so as to be visible outside the projection space in the axial direction X1 of the guide portion 10. Therefore, it is possible to omit the inspection relating to the press-fitting process, and the manufacturing cost can be reduced.
Next, FIG. 7 shows an electrode structure B of a sealed battery to which a coupling structure A of a metal plate and a metal shaft is applied. As shown in FIG. 7, the sealed battery 20 includes, for example, a battery case 21 as an outer container having a rectangular parallelepiped shape, and a metal plate 1 </ b> A as a pair of external terminals arranged on the terminal arrangement surface 22 of the battery case 21. The electrode rod 23 is formed to protrude from the second surface 3 as the surface of the metal plate 1A. One metal plate 1A and the electrode rod 23 formed thereon constitute a positive electrode, and the other metal plate 1A and the electrode rod 23 formed thereon constitute a negative electrode.

図８に示すように、電池ケース２１の端子配置面２２に凹部２４が形成され、その凹部２４に、金属板１Ａの少なくとも一部が収容されている。凹部２４の底２４１及び内壁面２４２とこれに対向する金属板１Ａの第１面２（裏面）及び側面２５との間には、絶縁性の例えばゴムからなるシール部材２６が介在している。
電池ケース２１には、端子貫通孔２７が形成されており、内部端子としての金属軸５Ａの圧入端部７が、端子挿通孔２７に挿通され、金属板１Ａの第１面２（裏面２）の有底孔４に圧入されている。シール部材２６は、端子貫通孔２７を挿通した金属軸５Ａを取り囲んだ状態で、金属板１Ａの第１面２と電池ケース２１の凹部２４の底２４１との間に弾性的に挟持されることで、金属板１Ａにおける金属軸５Ａの貫通部分をシールしている。 As shown in FIG. 8, a recess 24 is formed in the terminal arrangement surface 22 of the battery case 21, and at least a part of the metal plate 1 </ b> A is accommodated in the recess 24. Between the bottom 241 and the inner wall surface 242 of the recess 24 and the first surface 2 (back surface) and the side surface 25 of the metal plate 1A opposite to the bottom 241, an insulating seal member 26 made of, for example, rubber is interposed.
A terminal through hole 27 is formed in the battery case 21, and the press-fit end portion 7 of the metal shaft 5A as an internal terminal is inserted into the terminal insertion hole 27, and the first surface 2 (back surface 2) of the metal plate 1A. The bottomed hole 4 is press-fitted. The seal member 26 is elastically sandwiched between the first surface 2 of the metal plate 1A and the bottom 241 of the recess 24 of the battery case 21 in a state of surrounding the metal shaft 5A inserted through the terminal through hole 27. Thus, the penetrating portion of the metal shaft 5A in the metal plate 1A is sealed.

本実施形態によれば、図１〜図６の実施形態と同じ効果を奏することができる。すなわち、外部端子（金属板１Ａ）に対する内部端子（金属軸５Ａ）の結合力が高く、また、外部端子（金属板１Ａ）に対する内部端子（金属軸５Ａ）の位置精度が高く、しかも製造コストを安くすることができる。また、金属板１Ａに端子貫通孔を設けないので、内部の電解質等の漏れ出しを防ぐためのシール構造を簡素化することができて、安価な密閉型電池の電極構造Ｂを実現することができる。   According to this embodiment, the same effect as the embodiment of FIGS. That is, the coupling force of the internal terminal (metal shaft 5A) to the external terminal (metal plate 1A) is high, the positional accuracy of the internal terminal (metal shaft 5A) to the external terminal (metal plate 1A) is high, and the manufacturing cost is reduced. Can be cheap. In addition, since the terminal through hole is not provided in the metal plate 1A, it is possible to simplify the seal structure for preventing leakage of the internal electrolyte and the like, and to realize an inexpensive sealed battery electrode structure B. it can.

本発明は前記実施の形態に限定されるものではなく、例えば、金属板や金属軸の材料としては、アルミニウム、銅、スチール、ステンレススチール（ＳＵＳ）等、導電性に優れた材料を用いることができる。その他、本発明の請求項記載の範囲内で種々の変更を施すことができる。   The present invention is not limited to the above-described embodiment. For example, as a material for a metal plate or a metal shaft, a material having excellent conductivity such as aluminum, copper, steel, stainless steel (SUS), or the like is used. it can. In addition, various modifications can be made within the scope of the claims of the present invention.

１…金属板、１Ａ…金属板（外部端子）、２…第１面、３…第２面、４…有底孔、４１…入口縁部、４２…底、５…金属軸、５Ａ…金属軸（内部端子）、６…主体部、７…圧入端部、８…肩部、９…多角形部、９１…区画面、１０…案内部、１０１…区画面、１０２…端面、１１…細径部、１２…塑性変形部、１３…塑性変形痕、２０…密閉型電池、２１…電池ケース、２２…端子配置面、２３…電極棒、２４…凹部、２４１…底面、２４２…内壁面、２５…側面、２６…シール部材、２７…端子貫通孔、Ａ…金属板と金属軸の結合構造、Ｂ…密閉型電池の電極構造、Ｄ１…（案内部）の直径、Ｄ２…（圧入前の有底孔の）直径、Ｄ３…（多角形部の外接円の）直径、Ｐ…投影空間、Ｓ１…くびれ空間、Ｔ１…板厚方向、Ｘ１…軸方向   DESCRIPTION OF SYMBOLS 1 ... Metal plate, 1A ... Metal plate (external terminal), 2 ... 1st surface, 3 ... 2nd surface, 4 ... Bottomed hole, 41 ... Entrance edge part, 42 ... Bottom, 5 ... Metal shaft, 5A ... Metal Axis (internal terminal), 6 ... main part, 7 ... press-fit end, 8 ... shoulder, 9 ... polygonal part, 91 ... section screen, 10 ... guide section, 101 ... section screen, 102 ... end face, 11 ... fine Diameter portion, 12 ... plastic deformation portion, 13 ... plastic deformation mark, 20 ... sealed battery, 21 ... battery case, 22 ... terminal arrangement surface, 23 ... electrode rod, 24 ... concave, 241 ... bottom surface, 242 ... inner wall surface, 25 ... side face, 26 ... sealing member, 27 ... terminal through hole, A ... metal plate / metal shaft coupling structure, B ... sealed battery electrode structure, D1 ... (guide portion) diameter, D2 ... (before press-fitting) Diameter (bottomed hole), D3 (diameter of the circumscribed circle of the polygonal part), P ... projection space, S1 ... constriction space, T1 ... plate thickness direction, X1 ... axial direction

Claims (4)

互いに平行な第１面及び第２面を有し、前記第１面に有底孔が形成された金属板と、
前記有底孔に圧入された金属軸と、を備え、
前記金属軸は、前記第１面に当接して前記第１面の変形を拘束した肩部を有する主体部と、前記有底孔に圧入された圧入端部と、を含み、
前記圧入端部は、前記主体部に隣接して設けられ前記主体部の軸方向の投影空間内に配置された多角形部と、前記有底孔の底に当接した端面を有し前記多角形部の軸方向の投影空間内に配置されたテーパ状の案内部と、前記案内部と前記多角形部とを接続し前記案内部と前記多角形部との間にくびれ空間を形成する細径部と、を含み、
前記多角形部は、前記有底孔の入口縁部を前記第２面側へ塑性変形させて前記入口縁部に食い込んでおり、
前記金属板は、前記くびれ空間に入り込んだ塑性変形部を含み、
前記金属板の第２面において、前記案内部の軸方向の投影空間外に、前記多角形部の圧入による塑性変形痕が視認可能に形成されている、金属板と金属軸の結合構造。 A metal plate having a first surface and a second surface parallel to each other and having a bottomed hole formed in the first surface;
A metal shaft press-fitted into the bottomed hole,
The metal shaft includes a main body having a shoulder that abuts against the first surface and restrains deformation of the first surface, and a press-fit end that is press-fitted into the bottomed hole,
The press-fit end portion has a polygonal portion provided adjacent to the main body portion and disposed in a projection space in the axial direction of the main body portion, and an end surface in contact with the bottom of the bottomed hole. A tapered guide portion disposed in the projection space in the axial direction of the rectangular portion, and a narrow portion that connects the guide portion and the polygon portion to form a constricted space between the guide portion and the polygon portion. A diameter portion, and
The polygonal part bites into the inlet edge by plastically deforming the inlet edge of the bottomed hole to the second surface side,
The metal plate is viewed including the constricted plastically deformed portion that enters into the space,
A coupling structure of a metal plate and a metal shaft , wherein a plastic deformation mark due to press-fitting of the polygonal portion is formed on the second surface of the metal plate so as to be visible outside the projection space in the axial direction of the guide portion . 前記くびれ空間を区画する、前記多角形部の区画面が、第１面に平行な平坦面である請求項１に記載の金属板と金属軸の結合構造。   The metal plate and metal shaft coupling structure according to claim 1, wherein a section screen of the polygonal section that divides the constricted space is a flat surface parallel to the first surface. 前記くびれ空間を区画する、前記案内部の区画面が、第１面に平行な平坦面である請求項１または２に記載の金属板と金属軸の結合構造。   The metal plate / metal shaft coupling structure according to claim 1, wherein a section screen of the guide section that divides the constricted space is a flat surface parallel to the first surface. 第１面としての裏面及び第２面としての表面を有し、前記裏面に有底孔が形成された外部端子としての金属板と、
電池ケース内から引き出され、前記有底孔に圧入された内部端子としての金属軸とを備え、
前記金属軸は、前記第１面に当接して前記第１面の変形を拘束した肩部を有する主体部と、前記有底孔に圧入された圧入端部と、を含み、
前記圧入端部は、前記主体部に隣接して設けられ前記主体部の軸方向の投影空間内に配置された多角形部と、前記有底孔の底に当接した端面を有し前記多角形部の軸方向の投影空間内に配置されたテーパ状の案内部と、前記案内部と前記多角形部とを接続し前記案内部と前記多角形部との間にくびれ空間を形成する細径部と、を含み、
前記多角形部は、前記有底孔の入口縁部を前記第２面側へ塑性変形させて前記入口縁部に食い込んでおり、
前記金属板は、前記くびれ空間に入り込んだ塑性変形部を含む、密閉型電池の電極構造。 A metal plate as an external terminal having a back surface as a first surface and a surface as a second surface, and a bottomed hole formed in the back surface;
With a metal shaft as an internal terminal pulled out from the battery case and press-fitted into the bottomed hole,
The metal shaft includes a main body having a shoulder that abuts against the first surface and restrains deformation of the first surface, and a press-fit end that is press-fitted into the bottomed hole,
The press-fit end portion has a polygonal portion provided adjacent to the main body portion and disposed in a projection space in the axial direction of the main body portion, and an end surface in contact with the bottom of the bottomed hole. A tapered guide portion disposed in the projection space in the axial direction of the rectangular portion, and a narrow portion that connects the guide portion and the polygon portion to form a constricted space between the guide portion and the polygon portion. A diameter portion, and
The polygonal part bites into the inlet edge by plastically deforming the inlet edge of the bottomed hole to the second surface side,
The metal plate includes an electrode structure of a sealed battery including a plastic deformation portion that enters the constricted space.
JP2011214985A 2011-09-29 2011-09-29 Coupling structure of metal plate and metal shaft and electrode structure of sealed battery Expired - Fee Related JP5639558B2 (en)

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