WO2007083697A1 - Cell set connecting plate - Google Patents

Cell set connecting plate Download PDF

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Publication number
WO2007083697A1
WO2007083697A1 PCT/JP2007/050686 JP2007050686W WO2007083697A1 WO 2007083697 A1 WO2007083697 A1 WO 2007083697A1 JP 2007050686 W JP2007050686 W JP 2007050686W WO 2007083697 A1 WO2007083697 A1 WO 2007083697A1
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WO
WIPO (PCT)
Prior art keywords
connection plate
weld bead
bead portion
thickness
welding
Prior art date
Application number
PCT/JP2007/050686
Other languages
French (fr)
Japanese (ja)
Inventor
Kazuo Kojima
Original Assignee
Sanoh Kogyo Kabushiki Kaisha
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sanoh Kogyo Kabushiki Kaisha filed Critical Sanoh Kogyo Kabushiki Kaisha
Publication of WO2007083697A1 publication Critical patent/WO2007083697A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/213—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for cells having curved cross-section, e.g. round or elliptic
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • 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

Definitions

  • the present invention relates to a connection plate for connecting battery cells in an assembled battery, and in particular, even for a connection plate made of copper as a material, the connection of the assembled battery can provide good welding strength by resistance welding. Concerning the connecting plate.
  • Battery packs in which secondary battery power is connected in series or in parallel are widely used for various applications including electric bicycles, hybrid vehicles, and hybrid vehicles.
  • battery capacity and density have been rapidly increasing.
  • connection plates are used to connect the battery cells in series or in parallel, and the connection plates are welded by resistance welding.
  • Figure 7 shows a conventional connection board.
  • connection plate 1 indicates a connection plate
  • this connection plate 1 is a rectangular metal thin plate, and has a middle-high shape with a central portion 2 raised in parallel.
  • a weld bead 5 is formed on the connection plate 1.
  • the connecting plate 1 is made of a nickel thin plate material, a steel thin plate plated with nickel, or a clad material in which a nickel thin plate is bonded to both front and back surfaces of a copper plate.
  • connection plate 1 When such a connection plate 1 is welded to the battery cell 7 by resistance welding, a current is passed in a state where the connection plate 1 is pressed against the battery cell 7 with the welding electrode 6 as shown in FIG. As a result, the weld bead portion 5 is melted by Joule heat generated by electric resistance, and the connection plate 1 can be welded to the battery cell 7.
  • the weld bead portion 5 has a shape as shown in FIG. 8 or FIG.
  • the weld bead portion 5 shown in FIG. 8 is a hemispherical weld bead portion
  • the weld bead portion 5 shown in FIG. 9 is a trapezoidal weld bead portion.
  • an object of the present invention is to solve the above-described problems of the prior art, and to prevent the welding current from being excessively increased while being a connection plate using a material having high conductivity such as copper as a base material.
  • Another object of the present invention is to provide an assembled battery connection plate that can secure sufficient welding strength of the connection plate.
  • the present invention provides a connecting plate having a weld bead portion at a welded portion of a connecting plate main body with respect to an assembled battery in which a plurality of battery cells are connected by a connecting plate.
  • a part having a higher electrical resistance than that of the base material of the connection plate body is formed in a part or the whole of the weld bead part.
  • the present invention is characterized in that the whole weld bead portion is formed of a thin portion thinner than the thickness of the connection plate main body.
  • the thin wall portion may include a step portion formed around the recess forming the weld bead portion.
  • the thickness of the thin portion is preferably 40 to 90% of the thickness of the connection plate body.
  • the main body of the connection plate body can be copper.
  • a thin part thinner than the thickness of the connection plate body may be formed in a part of the weld bead part.
  • the thin wall portion can have various shapes, such as gradually decreasing the wall thickness by applying force to the bottom.
  • FIG. 1 shows a first embodiment of a battery pack connection plate according to the present invention
  • FIG. 1 (A) is a plan view
  • Fig. 1 (B) is a side view.
  • FIG. 2 is a cross-sectional view showing a weld bead portion formed on the connection plate of the assembled battery according to the first embodiment.
  • FIG. 3 is a diagram showing a procedure for welding a connection plate of an assembled battery to a battery cell.
  • FIG. 4 is a diagram showing a procedure for welding a connection plate of an assembled battery to a battery cell.
  • FIG. 5 is a graph showing the relationship between the thickness of the main body of the connection plate, the ratio of the thickness of the bead portion, and the welding strength.
  • FIG. 6 is a cross-sectional view showing a weld bead portion formed on a connection plate of a battery pack according to a second embodiment.
  • FIG. 7 is an explanatory diagram of a welding process for a connecting plate of a conventional assembled battery.
  • FIG. 8 is a cross-sectional view showing a weld bead portion formed on a connection plate of a conventional assembled battery.
  • FIG. 9 is a cross-sectional view showing a weld bead portion formed on a connection plate of an assembled battery of another conventional example.
  • FIG. 1 is a view showing a connection plate of an assembled battery according to the first embodiment of the present invention.
  • connection plate 10 is a rectangular thin metal plate, and as shown in FIG. 1, from the center of the short sides on both sides of the connection plate 10, the slit 12 extends to the center position in parallel with the long side, Therefore, it is terminated.
  • the main body of the connection plate 10 is divided into two parts by these slits 12 and connected to the connection part 13.
  • a plurality of weld bead portions 14 are formed on both sides of the slit 12 at a position close to the short side.
  • These weld bead portions 14 are formed by processing a concave portion (a convex portion when viewed from the opposite side) recessed in a mortar shape by embossing.
  • connection plate 10 uses copper as a base material.
  • the material of the connection plate 10 in addition to the copper plate, nickel material, clad material in which nickel thin plates are bonded to both front and back surfaces using copper, etc. can be used. wear.
  • FIG. 2 is a view showing a cross section of the weld bead portion 14 formed on the connection plate 10.
  • the entire weld bead portion 14 is processed into a thin portion having a thickness b smaller than the thickness a of the main body.
  • the weld bead portion 14 shown in FIG. 2 has a shape in which one surface force of the connection plate 10 is recessed into a mortar shape to form a recess and protrudes to the other surface side.
  • the outer bottom surface portion of the weld bead portion 14 has a curved surface. When welding, the bottom of the curved surface comes into contact with the battery cell 7.
  • the bottom of the weld bead 14 has a linearly angular shape.
  • a step 15 is formed so as to surround the periphery of the recess that forms the weld bead 14, and the entire thickness of the weld bead 14 including the step 15 is uniformly b. ing.
  • connection plate 10 As described above to the battery cell 7 will be described with reference to FIG. 3 and FIG.
  • connection plate 10 When resistance welding the connection plate 10 to the battery cell 7, the connection plate 10 is pressed against the battery cell 7 with the welding electrode 6 of the resistance welding machine. At this time, as shown in FIG. 4, each of the positive electrode 6 and the negative electrode 6 is positioned with a slit 12 extending in the longitudinal direction in the short side force of the connection plate 10.
  • the entire weld bead portion 14 is a thin-walled portion, and the entire weld bead portion 14 is a portion having an electrical resistance higher than that of the base material of the connection plate 10 main body.
  • the amount of Joule heat generated during welding is further increased, and even if the base material is a material with a small specific resistance such as copper, the resistance can be increased locally and the welding current value can be increased excessively. Stable and stable welding can be performed.
  • the step portion 15 around the weld bead portion 14 there is an advantage that the area of the thin portion is expanded and heat is generated in a wider area.
  • FIG. 5 shows a ratio (bZa) between the thickness b of the weld bead portion 14 and the plate thickness a of the main body of the connection plate 10.
  • 6 is a graph showing the measurement results of welding strength after welding of the connecting plate 10 with different values.
  • the connection plate 10 a body having a thickness of 0.5 mm was used.
  • the tensile strength is maximized when the thickness ratio (bZa) is in the range of 60 to 80%, and decreases below 40%. From such a tendency, the resistance is increased and the weldability is improved by reducing the thickness b of the weld bead portion 14 with respect to the thickness a of the main body of the connection plate 10, but the weld bead portion 14 is increased in thickness. If b is too thin, the weld strength is weakened due to the fracture of the base metal around the bead. On the other hand, if the thickness b of the weld bead 14 is too thick, the resistance will not increase and the heat generation will be small, resulting in poor weldability.
  • the overall thickness ratio (bZa) is 40-90. If it is%, it can be seen that better welding strength than before can be obtained.
  • the first embodiment described above is an embodiment in which the step portion 15 is formed around the weld bead portion 14, but the embodiment in FIG. 6 forms the step portion 15 in the weld bead portion 14. Instead, it is an example in which the whole or a part is a thin-walled thin part.
  • the weld bead portion 14 shown in FIG. 6 (A) is generally thinner than the thickness of the main body of the connection plate 10.
  • the weld bead portion 14 shown in FIG. 6 (B) gradually decreases in thickness as it is directed toward the bottom, and is thinnest at the bottom 16 portion.
  • the weld bead 14 shown in Fig. 6 (C) has a uniform thin wall, which is the same as the weld bead 14 shown in Fig. 6 (A). It has become.
  • weld bead portion 14 is a thin wall portion. Any of the forces can increase the electrical resistance in the thin wall portion, so that it is stable due to greater heat generation without increasing the welding current. Welding becomes possible.
  • both the connection plate 10 and the weld bead portion 14 are the base material.
  • the material of the weld bead 14 may be different from the base material of the connection plate 10.
  • the weld bead portion 14 If the base material is copper, a material having a higher specific resistance than copper, for example, nickel, aluminum, or an alloy thereof can be formed.
  • the surface may be coated with a Ni plating film so that the resistance value is higher than that of the base material.
  • the connection plate 10 can be used for deviation of the series connection, the parallel connection, and the combination of the series and the parallel connection of the cell batteries.

Abstract

A plurality of cells are connected into a cell set by a connecting plate (10). The connecting plate (10) has a welding bead portion (14) in the welding portion of its body. A part of the whole of the welding bead portion (14) forms a portion having a higher electric resistance than a base material of the connecting plate body. Thus, even when using a material having a small intrinsic resistance and a high conductivity such as copper, it is possible to assure sufficient welding intensity between the cell and the welding plate without excessively increasing the welding current.

Description

組電池の接続板  Battery connection board
技術分野  Technical field
[0001] 本発明は、組電池において電池セル同士を接続する接続板に係り、特に、銅を材 料とする接続板であっても、抵抗溶接による良好な溶接強度を得られる組電池の接 続板に関する。  TECHNICAL FIELD [0001] The present invention relates to a connection plate for connecting battery cells in an assembled battery, and in particular, even for a connection plate made of copper as a material, the connection of the assembled battery can provide good welding strength by resistance welding. Concerning the connecting plate.
背景技術  Background art
[0002] 二次電池力 なる電池セルを直列または並列につな 、だ組電池は、電動式自転車 、ノ、イブリツド車をはじめとして、さまざまな用途に広く利用されている。そして近年で は、バッテリの高容量化、高密度化が急速に進んでいる。  [0002] Battery packs in which secondary battery power is connected in series or in parallel are widely used for various applications including electric bicycles, hybrid vehicles, and hybrid vehicles. In recent years, battery capacity and density have been rapidly increasing.
[0003] この種の組電池では、電池セル同士を直列または並列に接続するために、長方形 の接続板が用いられており、この接続板を抵抗溶接により溶接している。そこで、図 7 に従来の接続板を示す。  [0003] In this type of battery pack, rectangular connection plates are used to connect the battery cells in series or in parallel, and the connection plates are welded by resistance welding. Figure 7 shows a conventional connection board.
[0004] 図 7において、参照番号 1は接続板を示し、この接続板 1は、長方形の金属製薄板 であって、中央部 2が平行にせり上がった中高の形状となっている。接続板 1には溶 接ビード部 5が形成されている。この接続板 1の材質には、従来は、ニッケル薄板材、 鉄の薄板にニッケルめっきを施したものや、銅板の表裏両面にニッケル薄板を接合し たクラッド材等が用いられて 、る。  In FIG. 7, reference numeral 1 indicates a connection plate, and this connection plate 1 is a rectangular metal thin plate, and has a middle-high shape with a central portion 2 raised in parallel. A weld bead 5 is formed on the connection plate 1. Conventionally, the connecting plate 1 is made of a nickel thin plate material, a steel thin plate plated with nickel, or a clad material in which a nickel thin plate is bonded to both front and back surfaces of a copper plate.
[0005] このような接続板 1を抵抗溶接により電池セル 7に溶接する場合、図 7に示すよう〖こ 、溶接電極 6で接続板 1を電池セル 7に押し付けた状態で電流を流す。これにより、 電気抵抗により発生するジュール熱により溶接ビード部 5が溶け、接続板 1を電池セ ル 7に溶接することができる。  When such a connection plate 1 is welded to the battery cell 7 by resistance welding, a current is passed in a state where the connection plate 1 is pressed against the battery cell 7 with the welding electrode 6 as shown in FIG. As a result, the weld bead portion 5 is melted by Joule heat generated by electric resistance, and the connection plate 1 can be welded to the battery cell 7.
発明の開示  Disclosure of the invention
[0006] し力しながら、従来の接続板 1では、溶接ビード部 5は、図 8または図 9に示すような 形状になっている。図 8に示す溶接ビード部 5は、半球型の溶接ビード部で、図 9に 示す溶接ビード部 5は、断面形状が台形型の溶接ビード部である。  However, in the conventional connecting plate 1, the weld bead portion 5 has a shape as shown in FIG. 8 or FIG. The weld bead portion 5 shown in FIG. 8 is a hemispherical weld bead portion, and the weld bead portion 5 shown in FIG. 9 is a trapezoidal weld bead portion.
[0007] 従来の溶接ビード部 5は、接続板 1の母材と同じ材料である上に、母材の肉厚 aも溶 接ビード部 5の肉厚 bも同じ (a = b)であるので、接続板 1の母材が銅のような電導性 の高い材料の場合、ニッケルや、鉄などの銅よりも固有抵抗の高い材料を用いた接 続板に較べて、溶接時の発熱量が少ないため、溶接ビード部 5の溶け込み量が少な ぐ溶接強度の点で弱くなる。 [0007] The conventional weld bead portion 5 is made of the same material as the base material of the connection plate 1 and also has a thickness a of the base material that is melted. Since the wall thickness b of the contact bead part 5 is the same (a = b), when the base material of the connection plate 1 is a highly conductive material such as copper, the specific resistance is higher than that of copper such as nickel or iron. Compared to connecting plates using high materials, the amount of heat generated during welding is small, so the weld bead portion 5 has less penetration and is weaker in terms of welding strength.
[0008] このような銅の接続板 1を溶接する場合の弱点を補うため、溶接電流を大きくして溶 接ビード部 5での発熱量を増大させることが考えられる。しかし、発熱量の増大により 、溶けすぎて電池本体に穴が開いたり、溶接機の電極寿命の低下などの不具合が 生じるので、溶接電流はあまり大きくはできない。  [0008] In order to make up for such a weak point when welding the copper connection plate 1, it is conceivable to increase the heat generation amount at the weld bead portion 5 by increasing the welding current. However, the increase in the amount of heat generated causes problems such as excessive melting and holes in the battery body and a decrease in the electrode life of the welding machine, so the welding current cannot be increased too much.
[0009] そこで、本発明の目的は、前記従来技術の有する問題点を解消し、銅などの電導 率の高い材料を母材とする接続板でありながら、溶接電流を過剰に上げることなぐ 電池と接続板の十分な溶接強度を確保することを可能とする組電池の接続板を提供 することにある。  [0009] Therefore, an object of the present invention is to solve the above-described problems of the prior art, and to prevent the welding current from being excessively increased while being a connection plate using a material having high conductivity such as copper as a base material. Another object of the present invention is to provide an assembled battery connection plate that can secure sufficient welding strength of the connection plate.
[0010] 前記の目的を達成するために、本発明は、複数の電池セルを接続板で接続した組 電池にお 1ヽて接続板本体の溶接部分に溶接ビード部を有する接続板であって、前 記溶接ビード部の一部若しくは全体に接続板本体の母材よりも電気抵抗が高い部分 を形成したことを特徴とするものである。  [0010] In order to achieve the above object, the present invention provides a connecting plate having a weld bead portion at a welded portion of a connecting plate main body with respect to an assembled battery in which a plurality of battery cells are connected by a connecting plate. In addition, a part having a higher electrical resistance than that of the base material of the connection plate body is formed in a part or the whole of the weld bead part.
[0011] また、本発明では、前記溶接ビード部の全体が、接続板本体の厚みよりも薄い薄肉 部からなることを特徴としている。この薄肉部は、前記溶接ビード部を形成する凹部 の周囲に形成された段差部を含むようにしてもよ 、。  [0011] Further, the present invention is characterized in that the whole weld bead portion is formed of a thin portion thinner than the thickness of the connection plate main body. The thin wall portion may include a step portion formed around the recess forming the weld bead portion.
[0012] また、本発明では、薄肉部の厚さは、接続板本体の厚さの 40〜90%であることが 好ましい。そして、接続板本体は母材が銅を主材料とすることができる。  In the present invention, the thickness of the thin portion is preferably 40 to 90% of the thickness of the connection plate body. The main body of the connection plate body can be copper.
[0013] さらに、本発明では、前記溶接ビード部の一部に、接続板本体の厚みよりも薄い薄 肉部を形成するようにしてもよい。その場合、薄肉部は底に向力つて徐々に肉厚が薄 くするなど、様々な形状が可能である。 Furthermore, in the present invention, a thin part thinner than the thickness of the connection plate body may be formed in a part of the weld bead part. In that case, the thin wall portion can have various shapes, such as gradually decreasing the wall thickness by applying force to the bottom.
[0014] 本発明によれば、銅などの電導率の高 、材料を用いても、溶接電流を過剰に上げ ることなぐ電池と接続板の十分な溶接強度を確保することが可能となる。 [0014] According to the present invention, it is possible to ensure sufficient welding strength between the battery and the connecting plate without excessively increasing the welding current even when a material having a high conductivity such as copper is used.
図面の簡単な説明  Brief Description of Drawings
[0015] [図 1]図 1は、本発明による組電池の接続板の第 1実施形態を示し、図 1 (A)は平面 図、図 1 (B)は側面図である。 FIG. 1 shows a first embodiment of a battery pack connection plate according to the present invention, and FIG. 1 (A) is a plan view. Fig. 1 (B) is a side view.
[図 2]図 2は、第 1実施形態による組電池の接続板に形成される溶接ビード部を示す 横断面図である。  FIG. 2 is a cross-sectional view showing a weld bead portion formed on the connection plate of the assembled battery according to the first embodiment.
[図 3]図 3は、組電池の接続板を電池セルに溶接する手順を示す図である。  FIG. 3 is a diagram showing a procedure for welding a connection plate of an assembled battery to a battery cell.
[図 4]図 4は、組電池の接続板を電池セルに溶接する手順を示す図である。  FIG. 4 is a diagram showing a procedure for welding a connection plate of an assembled battery to a battery cell.
[図 5]図 5は、接続板の本体の肉厚と、ビード部の厚さの比と溶接強度の関係を示す グラフである。  FIG. 5 is a graph showing the relationship between the thickness of the main body of the connection plate, the ratio of the thickness of the bead portion, and the welding strength.
[図 6]図 6は、第 2実施形態による組電池の接続板に形成される溶接ビード部を示す 横断面図である。  FIG. 6 is a cross-sectional view showing a weld bead portion formed on a connection plate of a battery pack according to a second embodiment.
[図 7]図 7は、従来の組電池の接続板の溶接工程の説明図である。  FIG. 7 is an explanatory diagram of a welding process for a connecting plate of a conventional assembled battery.
[図 8]図 8は、従来の組電池の接続板に形成される溶接ビード部を示す横断面図で ある。  FIG. 8 is a cross-sectional view showing a weld bead portion formed on a connection plate of a conventional assembled battery.
[図 9]図 9は、他の従来例の組電池の接続板に形成される溶接ビード部を示す横断 面図である。  FIG. 9 is a cross-sectional view showing a weld bead portion formed on a connection plate of an assembled battery of another conventional example.
発明を実施するための最良の形態  BEST MODE FOR CARRYING OUT THE INVENTION
[0016] 以下、本発明による組電池の接続板の一実施形態について、添付の図面を参照し ながら説明する。  Hereinafter, an embodiment of an assembled battery connection plate according to the present invention will be described with reference to the accompanying drawings.
[0017] 第 1実施形態  [0017] First Embodiment
図 1は、本発明の第 1実施形態による組電池の接続板を示す図である。  FIG. 1 is a view showing a connection plate of an assembled battery according to the first embodiment of the present invention.
[0018] 接続板 10は、長方形の金属製薄板であって、図 1に示すように、接続板 10の両側 短辺の中央からは、スリット 12が長辺と平行に中央位置まで延びて、そこで終端して いる。これらのスリット 12によって接続板 10の本体は 2分割されるとともに接続部 13で つながつている形状になっている。このような接続板 10では短辺側に近い位置で、ス リット 12の両側に複数の溶接ビード部 14が形成されて ヽる。これらの溶接ビード部 1 4は、エンボス加工により、すり鉢形状にくぼんだ凹部 (反対側の面からみると凸部）を 加工することによって形成されている。なお、この実施形態では、接続板 10には、母 材の材料に銅が用いられている。接続板 10の素材については、銅板の他、ニッケル 材、銅を材料として表裏両面にニッケル薄板を接合したクラッド材等を用いることがで きる。 [0018] The connection plate 10 is a rectangular thin metal plate, and as shown in FIG. 1, from the center of the short sides on both sides of the connection plate 10, the slit 12 extends to the center position in parallel with the long side, Therefore, it is terminated. The main body of the connection plate 10 is divided into two parts by these slits 12 and connected to the connection part 13. In such a connection plate 10, a plurality of weld bead portions 14 are formed on both sides of the slit 12 at a position close to the short side. These weld bead portions 14 are formed by processing a concave portion (a convex portion when viewed from the opposite side) recessed in a mortar shape by embossing. In this embodiment, the connection plate 10 uses copper as a base material. As for the material of the connection plate 10, in addition to the copper plate, nickel material, clad material in which nickel thin plates are bonded to both front and back surfaces using copper, etc. can be used. wear.
[0019] 次に、図 2は、接続板 10に形成されている溶接ビード部 14の断面を示す図である 。図 2において、この実施形態による接続板 10では、溶接ビード部 14の全体が本体 の厚さ aよりも薄い厚さ bをもつ薄肉部に加工されている。この図 2に示した溶接ビード 部 14は、接続板 10の一方の面力もすり鉢形にくぼんで凹部を形成し、他方の面側 に突き出た形状になっている。このうち、図 2 (A)に示す実施形態では、溶接ビード 部 14の外側底面の部分は曲面をなしている。溶接するときには、曲面になった底の 部分が電池セル 7に当接する。図 2 (B)に示す実施形態では、溶接ビード部 14の底 部は、直線的に角張った形状になっている。そして、いずれも溶接ビード部 14を形 成する凹部の周囲を囲むように段差部 15が形成されており、この段差部 15の部分を 含む溶接ビード部 14全体の厚さが均一に bになっている。  Next, FIG. 2 is a view showing a cross section of the weld bead portion 14 formed on the connection plate 10. In FIG. 2, in the connection plate 10 according to this embodiment, the entire weld bead portion 14 is processed into a thin portion having a thickness b smaller than the thickness a of the main body. The weld bead portion 14 shown in FIG. 2 has a shape in which one surface force of the connection plate 10 is recessed into a mortar shape to form a recess and protrudes to the other surface side. Among these, in the embodiment shown in FIG. 2 (A), the outer bottom surface portion of the weld bead portion 14 has a curved surface. When welding, the bottom of the curved surface comes into contact with the battery cell 7. In the embodiment shown in FIG. 2 (B), the bottom of the weld bead 14 has a linearly angular shape. In each case, a step 15 is formed so as to surround the periphery of the recess that forms the weld bead 14, and the entire thickness of the weld bead 14 including the step 15 is uniformly b. ing.
[0020] 次に、以上のような接続板 10を電池セル 7に溶接する場合の手順について、図 3、 図 4を参照しながら説明する。  Next, a procedure for welding the connection plate 10 as described above to the battery cell 7 will be described with reference to FIG. 3 and FIG.
[0021] 接続板 10を電池セル 7に抵抗溶接する場合、抵抗溶接機の溶接電極 6で接続板 1 0を電池セル 7に押し付ける。このとき、図 4に示すように、正極、負極のそれぞれの電 極 6が接続板 10の短辺側力も長手方向に延びるスリット 12を間において位置決めさ れている。  When resistance welding the connection plate 10 to the battery cell 7, the connection plate 10 is pressed against the battery cell 7 with the welding electrode 6 of the resistance welding machine. At this time, as shown in FIG. 4, each of the positive electrode 6 and the negative electrode 6 is positioned with a slit 12 extending in the longitudinal direction in the short side force of the connection plate 10.
[0022] 図 3において、電極 6での加圧を維持したまま通電すると、この通電により生じる熱 によって、溶接ビード部 14が溶融するので、接続板 10を電池セル 7に溶接すること ができる。  In FIG. 3, when energization is performed while maintaining pressure on the electrode 6, the weld bead portion 14 is melted by the heat generated by the energization, so that the connection plate 10 can be welded to the battery cell 7.
[0023] 本実施形態の接続板 10では、溶接ビード部 14の全体が薄肉部になっており、この 溶接ビード部 14全体で接続板 10本体の母材の電気抵抗よりも電気抵抗が高い部 分を形成しているので、溶接時のジュール熱の発生量がより増大し、母材が銅のよう な固有抵抗の小さな材料でも、局所的に抵抗を上げ、溶接電流値を過剰に上げるこ となぐ安定した溶接を行うことができる。し力も、溶接ビード部 14の周囲に段差部 15 を形成することにより、薄肉部の面積が拡大し、より広い面積で発熱が生じる利点が ある。  [0023] In the connection plate 10 of the present embodiment, the entire weld bead portion 14 is a thin-walled portion, and the entire weld bead portion 14 is a portion having an electrical resistance higher than that of the base material of the connection plate 10 main body. As a result, the amount of Joule heat generated during welding is further increased, and even if the base material is a material with a small specific resistance such as copper, the resistance can be increased locally and the welding current value can be increased excessively. Stable and stable welding can be performed. In addition, by forming the step portion 15 around the weld bead portion 14, there is an advantage that the area of the thin portion is expanded and heat is generated in a wider area.
[0024] ここで、図 5は、溶接ビード部 14の厚さ bと接続板 10の本体の板厚 aとの比（bZa) を変えて接続板 10の溶接を行い、溶接強度の測定結果を示すグラフである。接続板 10には、本体の厚さ 0. 5mmのものを用いた。 Here, FIG. 5 shows a ratio (bZa) between the thickness b of the weld bead portion 14 and the plate thickness a of the main body of the connection plate 10. 6 is a graph showing the measurement results of welding strength after welding of the connecting plate 10 with different values. As the connection plate 10, a body having a thickness of 0.5 mm was used.
[0025] この図 5のグラフからわ力るように、引張強度は厚さの比（bZa)が 60〜80%の範 囲で最大になり、 40%を以下では減少していく。このような傾向から、接続板 10の本 体の厚さ aに対して溶接ビード部 14の厚さ bを薄くすることで抵抗が増大し、溶接性 は向上するが、溶接ビード部 14の厚さ bが薄すぎると、ビード回りでの母材破断により 溶接強度は弱くなる。逆に、溶接ビード部 14の厚さ bが厚すぎると、抵抗は上がらず 発熱量が小さくなり溶接性は悪くなる。厚さの比 (bZa)が 100%の場合、つまり溶接 ビード部 14の厚さが本体と同じになっている従来の溶接板と較べると、全体として厚 さの比 (bZa)は 40〜90%であれば従来よりも良好な溶接強度が得られることがわか る。 [0025] As shown in the graph of FIG. 5, the tensile strength is maximized when the thickness ratio (bZa) is in the range of 60 to 80%, and decreases below 40%. From such a tendency, the resistance is increased and the weldability is improved by reducing the thickness b of the weld bead portion 14 with respect to the thickness a of the main body of the connection plate 10, but the weld bead portion 14 is increased in thickness. If b is too thin, the weld strength is weakened due to the fracture of the base metal around the bead. On the other hand, if the thickness b of the weld bead 14 is too thick, the resistance will not increase and the heat generation will be small, resulting in poor weldability. When the thickness ratio (bZa) is 100%, that is, when compared with a conventional welded plate where the thickness of the weld bead 14 is the same as that of the main body, the overall thickness ratio (bZa) is 40-90. If it is%, it can be seen that better welding strength than before can be obtained.
[0026] 第 2実施形態  [0026] Second Embodiment
次に、本発明の第 2実施形態について、図 6を参照して説明する。  Next, a second embodiment of the present invention will be described with reference to FIG.
[0027] 上述した第 1実施形態は、溶接ビード部 14の周囲に段差部 15を形成した実施形 態であつたが、図 6の実施形態は、溶接ビード部 14に段差部 15を形成する替わりに 全体または一部を肉厚の薄い薄肉部とした例である。  The first embodiment described above is an embodiment in which the step portion 15 is formed around the weld bead portion 14, but the embodiment in FIG. 6 forms the step portion 15 in the weld bead portion 14. Instead, it is an example in which the whole or a part is a thin-walled thin part.
[0028] 図 6 (A)に示す溶接ビード部 14は、接続板 10の本体の肉厚よりも全体的に一様に 薄くなつている。これに対して、図 6 (B)に示す溶接ビード部 14は、底に向力つて徐 々に肉厚が薄くなり、底 16の部分で最も薄くなつている。図 6 (C)に示す溶接ビード 1 4では、全体が均一の薄肉部となっている点は、図 6 (A)の溶接ビード部 14と同様で ある力 底 16が直線的に角張った形状になっている。  [0028] The weld bead portion 14 shown in FIG. 6 (A) is generally thinner than the thickness of the main body of the connection plate 10. On the other hand, the weld bead portion 14 shown in FIG. 6 (B) gradually decreases in thickness as it is directed toward the bottom, and is thinnest at the bottom 16 portion. The weld bead 14 shown in Fig. 6 (C) has a uniform thin wall, which is the same as the weld bead 14 shown in Fig. 6 (A). It has become.
[0029] 以上のように溶接ビード部 14を薄肉部とする形状には様々なものがある力 いずれ も薄肉部での電気抵抗を高められるので、溶接電流を上げることなぐより大きな発 熱により安定した溶接が可能となる。  [0029] As described above, there are various types of shapes in which the weld bead portion 14 is a thin wall portion. Any of the forces can increase the electrical resistance in the thin wall portion, so that it is stable due to greater heat generation without increasing the welding current. Welding becomes possible.
[0030] 以上、本発明につ 、て、好適な実施形態を挙げて説明した力 本発明の上述した 第 1実施形態と第 2実施形態は、接続板 10と溶接ビード部 14が共に母材を銅とする 実施形態であつたが、これとは異なり、溶接ビード部 14の材料を接続板 10の母材と は異種の材料を用いるようにしてもよい。その場合、溶接ビード部 14は、接続板 10の 母材が銅であれば、銅よりも固有抵抗の高い材料例えば、ニッケル、アルミニウム、ま たはそれらの合金カゝら形成することができる。また、溶接ビード部 14を母材と同じ銅 にする替わりに、表面に Niめっき被膜で被覆することにより、抵抗値を母材よりも高め るよう〖こしてもよい。さらに、本発明では、接続板 10をセル電池の直列接続、並列接 続、直列と並列の組み合わせの 、ずれにも利用できることは 、うまでもな!/、。 [0030] As described above, the force described with reference to the preferred embodiment of the present invention. In the first embodiment and the second embodiment of the present invention described above, both the connection plate 10 and the weld bead portion 14 are the base material. However, unlike the embodiment, the material of the weld bead 14 may be different from the base material of the connection plate 10. In that case, the weld bead portion 14 If the base material is copper, a material having a higher specific resistance than copper, for example, nickel, aluminum, or an alloy thereof can be formed. Instead of using the same copper as the base metal for the weld bead portion 14, the surface may be coated with a Ni plating film so that the resistance value is higher than that of the base material. Furthermore, in the present invention, it is a matter of course that the connection plate 10 can be used for deviation of the series connection, the parallel connection, and the combination of the series and the parallel connection of the cell batteries.

Claims

請求の範囲 The scope of the claims
[1] 複数の電池セルを接続板で接続した組電池において接続板本体の溶接部分に溶 接ビード部を有する接続板であって、  [1] A connection plate having a weld bead portion at a welded portion of a connection plate body in an assembled battery in which a plurality of battery cells are connected by a connection plate,
前記溶接ビード部の一部若しくは全体に接続板本体の母材よりも電気抵抗が高い 部分を形成したことを特徴とする組電池の接続板。  A connection plate for an assembled battery, wherein a part having a higher electrical resistance than a base material of a connection plate body is formed on a part or the whole of the weld bead.
[2] 前記溶接ビード部の全体が、接続板本体の厚みよりも薄い薄肉部力もなることを特 徴とする請求項 1に記載の組電池の接続板。  [2] The connection plate for an assembled battery according to [1], wherein the whole weld bead portion also has a thin portion force that is thinner than a thickness of the connection plate body.
[3] 前記薄肉部は、前記溶接ビード部を形成する凹部の周囲に形成された段差部を含 むことを特徴とする請求項 2に記載の組電池の接続板。 [3] The assembled battery connection plate according to claim 2, wherein the thin portion includes a step portion formed around a concave portion forming the weld bead portion.
[4] 前記溶接ビード部の全体が、接続板本体の厚みよりも一様に薄い薄肉部からなり、 前記段差部を含まな!/ヽことを特徴とする請求項 3に記載の組電池の接続板。 [4] The assembled battery according to claim 3, wherein the entire weld bead portion is a thin portion that is uniformly thinner than the thickness of the connection plate body, and does not include the stepped portion! Connection board.
[5] 前記薄肉部の厚さは、接続板本体の厚さの 40〜90%であることを特徴とする請求 項 2または 3に記載の組電池の接続板。 5. The battery pack connection plate according to claim 2, wherein the thickness of the thin wall portion is 40 to 90% of the thickness of the connection plate body.
[6] 前記溶接ビード部の一部に、接続板本体の厚みよりも薄い薄肉部が形成されたこと を特徴とする請求項 2に記載の組電池の接続板。 6. The assembled battery connection plate according to claim 2, wherein a thin portion thinner than the thickness of the connection plate main body is formed in a part of the weld bead portion.
[7] 前記溶接ビード部は、底に向かって徐々に肉厚が薄くなる薄肉部を有することを特 徴とする請求項 6に記載の組電池の接続板。 7. The battery pack connection plate according to claim 6, wherein the weld bead portion has a thin wall portion that gradually decreases in thickness toward the bottom.
[8] 前記溶接ビード部は、エンボス加工により形成されたすり鉢形状を有することを特 徴とする請求項 1乃至 7のいずれかの項に記載の組電池の接続板。 8. The battery pack connection plate according to any one of claims 1 to 7, wherein the weld bead portion has a mortar shape formed by embossing.
[9] 前記接続板本体は銅を母材の主材料とし、前記溶接ビード部と母材を共通すること を特徴とする請求項 1乃至 7のいずれかの項に記載の組電池の接続板。 [9] The battery pack connection plate according to any one of claims 1 to 7, wherein the connection plate body has copper as a main material, and the weld bead portion and the base material are common. .
[10] 前記接続板本体は銅を母材の主材料とし、前記溶接ビード部は銅よりも電気抵抗 の高い材料力 なることを特徴とする請求項 1乃至 7のいずれかの項に記載の組電 池の接続板。 [10] The connection plate body according to any one of claims 1 to 7, wherein the connection plate main body is made of copper as a main material, and the weld bead portion has a material force having electric resistance higher than that of copper. Assembly battery connection plate.
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