WO2022185634A1 - Method for manufacturing storage battery terminal and storage battery - Google Patents

Method for manufacturing storage battery terminal and storage battery Download PDF

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Publication number
WO2022185634A1
WO2022185634A1 PCT/JP2021/043740 JP2021043740W WO2022185634A1 WO 2022185634 A1 WO2022185634 A1 WO 2022185634A1 JP 2021043740 W JP2021043740 W JP 2021043740W WO 2022185634 A1 WO2022185634 A1 WO 2022185634A1
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Prior art keywords
protrusion
height
storage battery
terminal
protrusions
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PCT/JP2021/043740
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French (fr)
Japanese (ja)
Inventor
大祐 吉田
勲 阿部
遼一 橋本
勇輝 高澤
航平 宇山
貴裕 井上
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古河電池株式会社
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Priority to CN202180006745.7A priority Critical patent/CN115315334B/en
Publication of WO2022185634A1 publication Critical patent/WO2022185634A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/14—Projection welding
    • 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
    • H01M50/543—Terminals
    • 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 method for manufacturing a storage battery terminal using projection welding and a storage battery.
  • alkaline storage batteries represented by nickel-cadmium storage batteries and nickel-hydrogen storage batteries, have excellent reversibility of charge and discharge, high output and high capacity, and are used as power sources for small devices such as mobile phones and electric tools. It is also used as a large power source for electric vehicles and hybrid vehicles.
  • These alkaline storage batteries are generally composed of an electrode plate group consisting of a nickel positive electrode containing nickel hydroxide as a main material, a negative electrode containing cadmium hydroxide, a hydrogen absorbing alloy or the like as a main material, and a separator interposed between the positive electrode and the negative electrode.
  • pole terminals electrically connected to the positive and negative electrodes penetrate the battery case lid from inside the battery case, and a part of the pole posts protrudes outside the battery case to take out the current.
  • Many structures are used. Nickel, nickel alloys, iron, steel, and the like are widely used as materials for pole terminals in this case.
  • the pole terminal of an alkaline storage battery is composed of a terminal portion 2 and an inverted U-shaped collector portion 3.
  • a lower end portion 21 of the terminal portion 2 and an upper end portion 31 of the collector portion 3 are arranged. are joined by welding.
  • Electrode pole terminal 1, in which lower end portion 21 of terminal portion 2 and upper end portion 31 of current collector portion 3 are joined, has ears (tabs) led out from the positive electrode plate and the negative electrode plate of the electrode plate group as current collector portion 3. , and are joined together by spot welding or the like (see FIG. 2 of Patent Document 1).
  • Arc welding has been conventionally used for welding the terminal portion 2 and the current collector portion 3 together, and among them, TIG welding is generally used.
  • TIG welding a heat-resistant tungsten electrode or a tungsten alloy electrode is used to generate an arc, and the terminal portion 2 and the current collector portion 3 are melted and welded by the arc heat.
  • an inert gas such as argon or helium. takes time. Furthermore, inert gases are expensive and costly.
  • a projection is formed on one of the welding members to be joined, the projection is brought into contact with the other welding member, pressure is applied by a pair of electrodes, and welding current is applied to the projection.
  • projection welding in which welding members are joined together by concentrating resistance heat (hereinafter sometimes referred to as "Joule heat") to melt the protrusions, which is a fast and inexpensive welding method. is.
  • the Joule heat generated by applying the welding current tends to concentrate on the projection located near the center of the weld.
  • the molten metal generated by melting the protrusion concentrates in the center of the welded portion, generating spatter in the welded portion.
  • the molten metal concentrates in the center of the welded portion, it may explode or splatter, creating a cavity in the welded portion, which may lead to a decrease in the welding strength of the terminal pole and an increase in conductive resistance.
  • the present inventors have found that, in a method for manufacturing a storage battery terminal by projection welding, it is possible to suppress poor welding of the terminal pole column by specifying the height of the projection and the interval between the projections. We have found that it is possible, and have arrived at the present invention.
  • a method for manufacturing a storage battery terminal is a method for manufacturing a storage battery terminal in which a terminal pole is formed by projection welding a lower end portion of a terminal portion and an upper end portion of a current collector portion, the method comprising: The upper end of the current collector has at least three protrusions arranged side by side, including a first protrusion and a second protrusion, wherein the first protrusion is the second protrusion.
  • the height of the first protrusion is lower than the height of the second protrusion, and the length from the center line in the height direction of the first protrusion to the center line in the height direction of the second protrusion.
  • the gist is that the ratio of the minimum length from the connecting portion of the first protrusion to the connecting portions of the two second protrusions to the length is 0.25 or more and 0.50 or less.
  • the height of the first protrusion is lower than the height of the second protrusion, and a sufficient distance is maintained between the first protrusion and the second protrusion. Therefore, Joule heat generated when a welding current is applied to the terminal portion and the current collecting portion can be suppressed from concentrating on the first projecting portion, and poor welding of the terminal pole can be suppressed.
  • FIG. 2 is a partial right side view showing a main part of the welding device of the method for manufacturing a terminal for a storage battery according to the embodiment of the present invention
  • FIG. 2 is a partial front view showing a current collector according to the embodiment of the present invention
  • FIG. 2 is a plan view showing a current collector according to the embodiment of the present invention
  • the same reference numerals denote the same components.
  • the drawings are schematic, and the relationship between the thickness and the planar dimensions, the ratio of the thickness of each member, and the like may differ from the actual ones.
  • mutual dimensional relationships, ratios, and the like may differ between drawings.
  • the X-axis direction, Y-axis direction, and Z-axis direction may be used to indicate directions.
  • the X-axis direction is the length direction of the current collector, which will be described later.
  • the Y-axis direction is the width direction of a current collecting portion, which will be described later.
  • the Z direction is the height direction of a current collecting portion, which will be described later.
  • the X-axis direction, Y-axis direction, and Z-axis direction are orthogonal to each other.
  • the XYZ axes form a right-handed system.
  • FIG. 1 is a partial right side view showing a main part of a welding device for a method of manufacturing a storage battery terminal according to an embodiment of the present invention.
  • FIG. 2 is a partial front view showing a current collector according to an embodiment of the invention.
  • 3 is a plan view of the current collector of FIG. 2.
  • FIG. 4 is a perspective view showing a terminal pole for power storage.
  • At least three projecting portions 4 are arranged side by side on the upper end portion 31 of the current collecting portion 3 , and the projecting portions 4 and the lower end portion 21 of the terminal portion 2 are provided. is installed in the welding device 5 so as to be in contact with the terminal portion 2 and the current collector portion 3 while applying pressure to the terminal portion 2 and the current collector portion 3 by a pair of electrodes 51, while applying a welding current to concentrate the Joule heat on the projection portion 4, The projecting portion 4 is melted to weld the terminal portion 2 and the current collecting portion 3 together.
  • the current collector 3 in the method for manufacturing a storage battery terminal according to the present invention includes a first protrusion 41 and two second protrusions 4 among the protrusions 4 arranged side by side on the upper end 31.
  • the first protrusion 41 is located between the second protrusions 42 (42'), and the height H1 of the first protrusion 41 is equal to that of the second protrusions 42 (42'). is formed to be lower than the height H 2 (H 2 ′) of .
  • the projecting portion 4 juxtaposed with the upper end portion 31 of the current collector portion 3 in such a configuration, in the projection welding between the lower end portion 21 of the terminal portion 2 and the upper end portion 31 of the current collector portion 3, the terminal portion 2 and the current collector 3, the height of the first protrusion 41 is lower than the height of the second protrusion 42, and the first protrusion 41 and the second protrusion 42 (42') , the Joule heat generated by the welding current is less likely to concentrate on the first protrusion 41, and the Joule heat can be dispersed to the second protrusion 42 (42').
  • the “welded portion” in this specification means the lower end portion 21 of the terminal portion 2 and the current collector portion 3 that are joined by projection welding between the lower end portion 21 of the terminal portion 2 and the upper end portion 31 of the current collector portion 3 . It is the joint portion with the upper end portion 31 of the .
  • the height H1 of the first protrusion 41 and the height H2 ( H2') of the second protrusion 42 (42') ') is formed so that H 1 ⁇ H 2 (H 2 '), Joule heat due to welding current and electrical resistance tends to concentrate on the first protrusion 41, and spatter, which is a welding defect, is generated. do.
  • the first protrusion 41 and the second protrusion 42 (42') are formed such that the ratio L/L 0 (ratio L'/L 0 ') is less than 0.25, the first protrusion Since the gap between the portion 41 and the second protrusion 42 (42') is narrowed, the Joule heat generated by applying the welding current concentrates on the first protrusion 41, and spatter, which is a poor welding, is generated. . Furthermore, explosion and scattering are likely to occur, and a cavity is generated in the welded portion, resulting in a decrease in the weld strength of the terminal pole column 1 .
  • the “first projection” is the lowest projection among the projections 4 arranged side by side on the upper end 31 of the current collector 3, and the “second projection” is collected.
  • the protrusions are defined as the protrusions on both sides of the first protrusion 41.
  • the “height of the projection” is defined as the height from the upper end 31 of the current collector 3 to the top of the projection 4 .
  • the “connection portion of the first protrusion” is the connection portion between the upper end portion 31 of the current collector 3 and the first protrusion 41
  • the “connection portion of the second protrusion” is the upper end portion 31 of the current collector 3 .
  • “CL 2 ” is the center line in the height direction (Z-axis direction) of one second protrusion 42
  • CL 2 ′ is the height direction (Z-axis direction) of the other second protrusion 42 ′. direction
  • “H 2 ” is the height of one second projection 42
  • “H 2 ′” is the height of the other second projection 42 ′
  • “L 0 ” is the length from the center line CL1 in the height direction (Z-axis direction) of the first protrusion 41 to the center line CL2 in the height direction (Z-axis direction) of one of the second protrusions 42.
  • L 0 ' is the center line CL in the height direction (Z-axis direction) of the first protrusion 41 from the center line CL 1 in the height direction (Z-axis direction) of the other second protrusion 42'.
  • L is the minimum length from the connecting portion 411 of the first protrusion 41 to the connecting portion 421 of one of the second protrusions 42
  • L′ is the first It is the minimum length from the connecting portion 411 of the protrusion 41 to the connecting portion 421' of the other second protrusion 42'.
  • the height H1 of the first protrusion 41 may be formed lower than the height H2 of one second protrusion 42 and the height H2' of the other second protrusion 42. Good luck.
  • the ratio L/L 0 and the ratio L'/L 0 ' may be adjusted by appropriately changing the length of the projection 4 of the first projection 41 or the second projection 42 (42'). You may adjust by changing suitably the position which arranges the 1st projection part 41 or the 2nd projection part 42 (42') side by side.
  • the "length of the protrusion" in this specification is defined as the length dimension of the protrusion in the X-axis direction in the drawings.
  • the height H1 of the first protrusion 41 is 0.2 mm or more and 0.4 mm or less
  • the height H1 of the first protrusion 41 and the height H2 of the second protrusion 42 (42') ( H 2 ′) is preferably 0.1 mm or more and 0.2 mm or less, and a more reliable effect of suppressing the occurrence of defective welding can be obtained.
  • H 2 -H 1 and H 2 '-H 1 are It is preferable to form the first projecting portion 41 and the second projecting portion 42 (42') so as to be 0.1 mm or more and 0.2 mm or less.
  • the first protrusion 41 is preferably formed in the center of the upper end 31 of the current collector 3 . , Since the first protrusion with the lowest height is located in the center of the welded part, it is possible to further suppress the concentration of Joule heat in the center of the welded part. The occurrence can be further suppressed.
  • the shape of the protrusion 4 is not particularly limited, and may be hemispherical, conical, cylindrical, polygonal pyramidal, or polygonal columnar. Also, the shape of the first protrusion 41 and the second protrusion 42 (42') may be different. Furthermore, among the protrusions 4 arranged side by side at the upper end of the current collector, the protrusions other than the first protrusion 41 and the two second protrusions 42 (42') are replaced with the second protrusions 42 ( 42') may be further provided on the outward (X-axis direction) side.
  • the first protrusion 41 and the second protrusion 42 (42') are arranged side by side in the longitudinal direction of the upper end 31 (4.5 mm x 35 mm) of the inverted U-shaped steel material. folded like this.
  • the first protrusion 41 is provided at the center of the upper end portion 31, and the two second protrusions 42 (42') are provided at substantially symmetrical positions with the first protrusion 41 as the center.
  • the ratio L/L 0 was 0.25 in Example 1, 0.44 in Example 2, and 0.44 in Example 2, by appropriately changing the positions where the two second protrusions 42 (42′) were provided by die press working. 2 was adjusted to 0.10. Note that the ratio L'/L 0 ' is the same value as the ratio L/L 0 .
  • the projection diameter of the first projecting portion 41 and the second projecting portion 42 (42') is 4.5 mm.
  • Example 3 Example 1 except that the projection diameter of the first projection portion 41 and the second projection portion 42 (42') was 3.0 mm, and the ratio L/L 0 and the ratio L'/L 0 ' were 0.50.
  • a terminal pole 1 was prepared in the same manner as in , and the method for manufacturing this storage battery terminal was used as Example 3.
  • Example 4 Except that the height dimension (H 1 ) of the first protrusion 41 is set to 0.2 mm, and the height dimensions H 2 and H 2 ' of the two second protrusions 42 (42') are set to 0.4 mm. , the terminal pole 1 was produced in the same manner as in Example 1, and the production method of this storage battery terminal was referred to as Example 4.
  • Example 5 A terminal pole column 1 was produced in the same manner as in Example 1 except that the height dimensions H 2 and H 2 ′ of the two second protrusions 42 (42′) were set to 0.4 mm, and the storage battery terminal was fabricated.
  • Example 5 was used as the manufacturing method.
  • Example 6 The height dimension H 1 of the first protrusion 41 was set to 0.4 mm, and the height dimensions H 2 and H 2 ' of the two second protrusions 42 (42') were set to 0.6 mm.
  • a terminal pole 1 was produced in the same manner as in Example 1, and the method for producing this storage battery terminal was defined as Example 6. (Comparative Example 3) Example 1 except that the projection diameter of the first projection portion 41 and the second projection portion 42 (42') was 2.5 mm, and the ratio L/L 0 and the ratio L'/L 0 ' were 0.58.
  • a terminal pole 1 was prepared in the same manner as in , and this storage battery terminal manufacturing method was used as Comparative Example 2.
  • Comparative Example 1 In the same manner as in Example 1 , the terminal An electrode column 1 was produced, and this method for producing a storage battery terminal was referred to as Comparative Example 1.
  • the height H 1 of the first protrusion 41 is lower than the height H 2 (H 2 ') of the two second protrusions 42 (42'), and the ratio L/L 0 and the ratio L'/L 0 ' of 0.25 or more and 0.50 or less.
  • the storage battery terminal of Comparative Example 1 in which the height H 1 of the first projection 41 and the height H 2 (H 2 ′) of the two second projections 42 (42′) are 0.5 mm
  • spatter which is a welding defect
  • the resistance was as low as 29.5 kN and the conductive resistance as high as 56.2 ⁇ . This is because the height H 1 of the first protrusion 41 is the same as the height H 2 (H 2 ') of the two second protrusions 42 (42'), so that it is generated by applying the welding current.
  • Joule heat was concentrated on the first protrusion 41 and spatter was generated in the welded portion.
  • due to the concentration of Joule heat on the first protrusion 41 explosions and splashes occurred, creating cavities in the welded portion, reducing the welding strength of the terminal pole column, and increasing the conductive resistance.
  • Spatter which is a welding defect, occurs in the part, the tensile strength is as low as 28.8 kN and the conductive resistance is 58.6 ⁇ compared to the terminal poles produced by the manufacturing method of the storage battery terminal of Examples 1 to 6. was expensive. This is because the distance between the first protrusion 41 and the two second protrusions 42 (42') is narrow, so that the Joule heat generated by applying the welding current concentrates on the first protrusion 41, resulting in welding.
  • the spatter occurred in the part.
  • the concentration of Joule heat on the first projection 41 due to the concentration of Joule heat on the first projection 41, explosions and splashes are likely to occur, creating cavities in the welded portion, reducing the welding strength of the terminal pole column, and increasing the conductive resistance.
  • the tensile strength of the terminal pole poles produced by the method for manufacturing a storage battery terminal of Comparative Example 3, in which the ratio L/L 0 and the ratio L′/L 0 ′ are 0.58 was lower than that of the storage battery terminals of Examples 1 to 6.
  • the resistance was as low as 29.2 kN and the conductive resistance was as high as 57.3 ⁇ .
  • a method for manufacturing a storage battery terminal in which a terminal pole is formed by projection welding at least three protrusions are arranged side by side on the upper end of the current collector.
  • a second protrusion is provided, the first protrusion is arranged between the two second protrusions, and the height H1 of the first protrusion 41 is the height of the two second protrusions 42 (42').
  • the height is lower than H 2 (H 2 ') and the ratio L/L 0 and the ratio L'/L 0 ' are 0.25 or more and 0.50 or less.

Abstract

The present invention addresses the problem of providing a method for manufacturing a storage battery terminal that can suppress a welding strength reduction due to poor welding of a terminal pole.　Provided is a method for manufacturing a storage battery terminal that forms a terminal pole by projection welding, wherein: an upper end portion 31 of a current collector 3 has at least three protrusions arranged side by side, and, among said protrusions, is provided with a first protrusion 41 and second protrusions 42 (42'); the first protrusion 41 is positioned between the second protrusions 42 (42'); the height H1 of the first protrusion 41 is lower than the height H2 (H2') of the second protrusions 42 (42'); and the ratio of the length L 0 (L0') from the center line CL 1 in the height direction (Z-axis direction) of the first protrusion 41 to the center line CL 2 (CL 2') in the height direction (Z-axis direction) of the second protrusion 42 (42') and the minimum length L (L') from a connection portion 411 of the first protrusion 41 to a connection portion 421 (421') of the second protrusion 42 (42') is 0.25-0.50.

Description

蓄電池用端子の製造方法および蓄電池Storage battery terminal manufacturing method and storage battery
本発明は、プロジェクション溶接を利用した蓄電池用端子の製造方法および蓄電池に関するものである。 TECHNICAL FIELD The present invention relates to a method for manufacturing a storage battery terminal using projection welding and a storage battery.
従来、ニッケル－カドミウム蓄電池やニッケル－水素蓄電池等に代表されるアルカリ蓄電池は、充放電の可逆性に優れ、高出力かつ高容量であり、携帯電話や電動工具のような小型機器の動力源として用いられるだけでなく、電気自動車やハイブリッド自動車の大型動力源としても活用されている。これらのアルカリ蓄電池は、一般に、水酸化ニッケルを主材料として含むニッケル正極、水酸化カドミウム、水素吸蔵合金等を主材料として含む負極、前記正極と負極との間に介在するセパレータからなる極板群を電槽内に配置し、正極及び負極と電気的に接続された極柱端子が電槽内から電槽蓋を貫通して、電槽外に極柱の一部が突出して電流を取り出すという構造を多く採用している。この場合の極柱端子の材質としては、ニッケル、ニッケル合金、鉄、鋼材等が広く使用されている。 Conventionally, alkaline storage batteries, represented by nickel-cadmium storage batteries and nickel-hydrogen storage batteries, have excellent reversibility of charge and discharge, high output and high capacity, and are used as power sources for small devices such as mobile phones and electric tools. It is also used as a large power source for electric vehicles and hybrid vehicles. These alkaline storage batteries are generally composed of an electrode plate group consisting of a nickel positive electrode containing nickel hydroxide as a main material, a negative electrode containing cadmium hydroxide, a hydrogen absorbing alloy or the like as a main material, and a separator interposed between the positive electrode and the negative electrode. is placed in the battery case, and the pole terminals electrically connected to the positive and negative electrodes penetrate the battery case lid from inside the battery case, and a part of the pole posts protrudes outside the battery case to take out the current. Many structures are used. Nickel, nickel alloys, iron, steel, and the like are widely used as materials for pole terminals in this case.
アルカリ蓄電池の極柱端子は、図４に示すように、端子部２と逆Ｕ字状の集電部３から構成されており、端子部２の下端部２１と集電部３の上端部３１を溶接することで接合されている。そして、端子部２の下端部２１と集電部３の上端部３１とが接合された極柱端子１は、極板群の正極板および負極板から導出した耳（タブ）を集電部３の逆Ｕ字内に挿入して互いにスポット溶接等により接合する構成が公知である（特許文献１の図２参照）。 As shown in FIG. 4, the pole terminal of an alkaline storage battery is composed of a terminal portion 2 and an inverted U-shaped collector portion 3. A lower end portion 21 of the terminal portion 2 and an upper end portion 31 of the collector portion 3 are arranged. are joined by welding. Electrode pole terminal 1, in which lower end portion 21 of terminal portion 2 and upper end portion 31 of current collector portion 3 are joined, has ears (tabs) led out from the positive electrode plate and the negative electrode plate of the electrode plate group as current collector portion 3. , and are joined together by spot welding or the like (see FIG. 2 of Patent Document 1).
端子部２と集電部３との溶接には、従来からアーク溶接が使用されており、中でも、ＴＩＧ溶接が一般的である。ＴＩＧ溶接は、熱に強いタングステン電極もしくはタングステン合金電極を用いて、アークを発生させ、そのアーク熱によって端子部２と集電部３とを溶融して、溶接する。然しながら、溶融金属が大気中の酸素や窒素等により酸化・窒化することを防ぐためにアルゴンやヘリウム等の不活性ガスにより大気から遮断しながら溶接を行うため、溶接速度が遅く、極柱端子の作製に時間が掛かってしまう。さらには、不活性ガスは高価であり、費用も掛かってしまう。 Arc welding has been conventionally used for welding the terminal portion 2 and the current collector portion 3 together, and among them, TIG welding is generally used. In TIG welding, a heat-resistant tungsten electrode or a tungsten alloy electrode is used to generate an arc, and the terminal portion 2 and the current collector portion 3 are melted and welded by the arc heat. However, in order to prevent the molten metal from being oxidized and nitrided by oxygen and nitrogen in the atmosphere, welding is performed while shielding it from the atmosphere with an inert gas such as argon or helium. takes time. Furthermore, inert gases are expensive and costly.
その他の溶接方法として、接合する溶接部材の一方に突起部を形成し、この突起部と他方の溶接部材とを当接させて、一対の電極により加圧し、溶接電流を通電して突起部に抵抗発熱（以降、「ジュール熱」と記すこともある。）を集中させることで、その突起部を溶融させて、溶接部材同士を接合するプロジェクション溶接があり、溶接速度が速く、安価な溶接方法である。 As another welding method, a projection is formed on one of the welding members to be joined, the projection is brought into contact with the other welding member, pressure is applied by a pair of electrodes, and welding current is applied to the projection. There is projection welding, in which welding members are joined together by concentrating resistance heat (hereinafter sometimes referred to as "Joule heat") to melt the protrusions, which is a fast and inexpensive welding method. is.
然しながら、溶接電流を通電することで発生するジュール熱は、溶接部の中央付近に位置する突起部に集中し易い。そのため、突起部が溶融して発生する溶融金属が、溶接部の中央に集中して、溶接部にスパッタが発生してしまい、そのスパッタが対極に接触すると蓄電池の短絡を引き起こす恐れがある。また、溶融金属が溶接部の中央に集中すると、爆飛や飛び散りが発生し、溶接部に空洞が生じ、端子極柱の溶接強度の低下や導電抵抗の上昇を引き起こす恐れもある。 However, the Joule heat generated by applying the welding current tends to concentrate on the projection located near the center of the weld. As a result, the molten metal generated by melting the protrusion concentrates in the center of the welded portion, generating spatter in the welded portion. In addition, if the molten metal concentrates in the center of the welded portion, it may explode or splatter, creating a cavity in the welded portion, which may lead to a decrease in the welding strength of the terminal pole and an increase in conductive resistance.
特開２００８－２８８２１７号公報JP 2008-288217 A
そこで、本発明者は、種々検討した結果、プロジェクション溶接による蓄電池用端子の製造方法において、突起部の高さおよび突起部の間隔を規定することにより、端子極柱の溶接不良を抑制することが可能であることを見出し、本願発明に至ったものである。 Therefore, as a result of various studies, the present inventors have found that, in a method for manufacturing a storage battery terminal by projection welding, it is possible to suppress poor welding of the terminal pole column by specifying the height of the projection and the interval between the projections. We have found that it is possible, and have arrived at the present invention.
したがって、本発明は、端子極柱の溶接不良を抑制することができる蓄電池用端子の製造方法を提供することを目的とする。 SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a method for manufacturing a storage battery terminal capable of suppressing defective welding of a terminal pole.
本発明の一態様に係る蓄電池用端子の製造方法は、端子部の下端部と、集電部の上端部とをプロジェクション溶接して端子極柱を形成する蓄電池用端子の製造方法であって、集電部の上端部は、並設された少なくとも３つの突起部を有し、突起部のうち、第一突起部と、第二突起部を備え、第一突起部は、第二突起部の間に位置し、第一突起部の高さは、第二突起部の高さよりも低く、第一突起部の高さ方向の中心線から第二突起部の高さ方向の中心線までの長さに対する、第一突起部の接続部位から２つの第二突起部の接続部位までの最小長さの比率が、０．２５以上０．５０以下であることを要旨とする。 A method for manufacturing a storage battery terminal according to an aspect of the present invention is a method for manufacturing a storage battery terminal in which a terminal pole is formed by projection welding a lower end portion of a terminal portion and an upper end portion of a current collector portion, the method comprising: The upper end of the current collector has at least three protrusions arranged side by side, including a first protrusion and a second protrusion, wherein the first protrusion is the second protrusion. The height of the first protrusion is lower than the height of the second protrusion, and the length from the center line in the height direction of the first protrusion to the center line in the height direction of the second protrusion The gist is that the ratio of the minimum length from the connecting portion of the first protrusion to the connecting portions of the two second protrusions to the length is 0.25 or more and 0.50 or less.
本発明に係る蓄電池用端子の製造方法によれば、第一突起部の高さが第二突起部の高さよりも低く、第一突起部と第二突起部との間隔が十分に保たれるため、端子部と集電部とに溶接電流を通電した際に発生するジュール熱が、第一突起部に集中することを抑制でき、端子極柱の溶接不良を抑制することができる。 According to the method for manufacturing a storage battery terminal according to the present invention, the height of the first protrusion is lower than the height of the second protrusion, and a sufficient distance is maintained between the first protrusion and the second protrusion. Therefore, Joule heat generated when a welding current is applied to the terminal portion and the current collecting portion can be suppressed from concentrating on the first projecting portion, and poor welding of the terminal pole can be suppressed.
本発明の実施形態に係る蓄電池用端子の製造方法の溶接装置の要部を示した部分右側面図。FIG. 2 is a partial right side view showing a main part of the welding device of the method for manufacturing a terminal for a storage battery according to the embodiment of the present invention; 本発明の実施形態に係る集電部を示した部分正面図。FIG. 2 is a partial front view showing a current collector according to the embodiment of the present invention; 本発明の実施形態に係る集電部を示した平面図。FIG. 2 is a plan view showing a current collector according to the embodiment of the present invention; 蓄電用端子極柱を示す斜視図。The perspective view which shows the terminal pole for electrical storage.
本発明の実施形態を、図を用いて説明する。尚、以下に説明する実施形態は本発明の一例を示したものであって、本発明は本実施形態に限定されるものではない。また、本実施形態には種々の変更または改良を加えることが可能であり、そのような変更または改良を加えた形態も本発明に含まれ得る。 An embodiment of the present invention will be described with reference to the drawings. The embodiment described below is an example of the present invention, and the present invention is not limited to this embodiment. In addition, various modifications or improvements can be added to the present embodiment, and forms to which such modifications or improvements are added can also be included in the present invention.
以下の図面の記載において、同一符号は同一構成部材を示す。ただし、図面は模式的なものであり、厚みと平面寸法との関係、各部材の厚みの比率等は現実のものとは異なり得る。また、図面相互間においても互いの寸法の関係や比率等が異なり得る。さらには、Ｘ軸方向、Ｙ軸方向およびＺ軸方向を用いて、方向を示す場合がある。例えば、Ｘ軸方向は、後述する集電部の長さ方向である。Ｙ軸方向は、後述する集電部の幅方向である。Ｚ方向は、後述する集電部の高さ方向である。Ｘ軸方向、Ｙ軸方向、およびＺ軸方向は、お互いに直交する。ＸＹＺ軸は右手系をなす。 In the following description of the drawings, the same reference numerals denote the same components. However, the drawings are schematic, and the relationship between the thickness and the planar dimensions, the ratio of the thickness of each member, and the like may differ from the actual ones. In addition, mutual dimensional relationships, ratios, and the like may differ between drawings. Furthermore, the X-axis direction, Y-axis direction, and Z-axis direction may be used to indicate directions. For example, the X-axis direction is the length direction of the current collector, which will be described later. The Y-axis direction is the width direction of a current collecting portion, which will be described later. The Z direction is the height direction of a current collecting portion, which will be described later. The X-axis direction, Y-axis direction, and Z-axis direction are orthogonal to each other. The XYZ axes form a right-handed system.
図１は、本発明の実施形態に係る蓄電池用端子の製造方法の溶接装置の要部を示した部分右側面図である。図２は、本発明の実施形態に係る集電部を示した部分正面図である。図３は、図２の集電部の平面図である。図４は、蓄電用端子極柱を示す斜視図である。 FIG. 1 is a partial right side view showing a main part of a welding device for a method of manufacturing a storage battery terminal according to an embodiment of the present invention. FIG. 2 is a partial front view showing a current collector according to an embodiment of the invention. 3 is a plan view of the current collector of FIG. 2. FIG. FIG. 4 is a perspective view showing a terminal pole for power storage.
　図１に示すように、本発明の蓄電池用端子の製造方法は、集電部３の上端部３１に少なくとも３つの突起部４を並設し、その突起部４と端子部２の下端部２１とが当接するように溶接装置５に設置し、端子部２と集電部３とを一対の電極５１により加圧しながら、溶接電流を通電して突起部４にジュール熱を集中させることで、その突起部４を溶融させて、端子部２と集電部３とを溶接するものである。 As shown in FIG. 1 , in the method for manufacturing a storage battery terminal of the present invention, at least three projecting portions 4 are arranged side by side on the upper end portion 31 of the current collecting portion 3 , and the projecting portions 4 and the lower end portion 21 of the terminal portion 2 are provided. is installed in the welding device 5 so as to be in contact with the terminal portion 2 and the current collector portion 3 while applying pressure to the terminal portion 2 and the current collector portion 3 by a pair of electrodes 51, while applying a welding current to concentrate the Joule heat on the projection portion 4, The projecting portion 4 is melted to weld the terminal portion 2 and the current collecting portion 3 together.
　図２に示すように、本発明に係る蓄電池用端子の製造方法における集電部３は、上端部３１に並設された突起部４のうち、第一突起部４１と、２つの第二突起部４２（４２’）を備え、第一突起部４１は第二突起部４２（４２’）の間に位置し、第一突起部４１の高さＨ１は第二突起部４２（４２’）の高さＨ２（Ｈ２’）よりも低く形成されている。さらには、第一突起部４１の高さ方向（Ｚ軸方向）の中心線ＣＬ１から第二突起部４２（４２’）の高さ方向（Ｚ軸方向）の中心線ＣＬ２（ＣＬ２’）までの長さＬ０（Ｌ０’）と、第一突起部４１の接続部位４１１から第二突起部４２（４２’）の接続部位４２１（４２１’）までの最小長さＬ（Ｌ’）との比率Ｌ／Ｌ０（比率Ｌ’／Ｌ０’）が、０．２５以上０．５０以下となるように形成する。 As shown in FIG. 2, the current collector 3 in the method for manufacturing a storage battery terminal according to the present invention includes a first protrusion 41 and two second protrusions 4 among the protrusions 4 arranged side by side on the upper end 31. The first protrusion 41 is located between the second protrusions 42 (42'), and the height H1 of the first protrusion 41 is equal to that of the second protrusions 42 (42'). is formed to be lower than the height H 2 (H 2 ′) of . Furthermore, from the center line CL 1 in the height direction (Z-axis direction) of the first protrusion 41 to the center line CL 2 (CL 2 ') in the height direction (Z-axis direction) of the second protrusion 42 (42') ) to the length L 0 (L 0 ') and the minimum length L (L' ) and L/L 0 (ratio L′/L 0 ′) is 0.25 or more and 0.50 or less.
　集電部３の上端部３１に並設する突起部４をこのような構成にすることで、端子部２の下端部２１と集電部３の上端部３１とのプロジェクション溶接において、端子部２と集電部３とに溶接電流を通電した際、第一突起部４１の高さが、第二突起部４２の高さより低く、第一突起部４１と第二突起部４２（４２’）との間隔が十分に保たれるため、溶接電流により発生するジュール熱が第一突起部４１に集中し難くなり、第二突起部４２（４２’）へジュール熱を分散することができる。これにより、溶融金属が溶接部の中央に集中することを抑制でき、スパッタや爆飛、飛び散り等の溶接不良の発生を抑制することができる。なお、本明細書における「溶接部」とは、端子部２の下端部２１と集電部３の上端部３１とのプロジェクション溶接によって接合される、端子部２の下端部２１と集電部３の上端部３１との接合部分のことである。 By configuring the projecting portion 4 juxtaposed with the upper end portion 31 of the current collector portion 3 in such a configuration, in the projection welding between the lower end portion 21 of the terminal portion 2 and the upper end portion 31 of the current collector portion 3, the terminal portion 2 and the current collector 3, the height of the first protrusion 41 is lower than the height of the second protrusion 42, and the first protrusion 41 and the second protrusion 42 (42') , the Joule heat generated by the welding current is less likely to concentrate on the first protrusion 41, and the Joule heat can be dispersed to the second protrusion 42 (42'). As a result, it is possible to suppress the molten metal from concentrating at the center of the welded portion, thereby suppressing the occurrence of welding defects such as spatter, explosion, and splattering. In addition, the “welded portion” in this specification means the lower end portion 21 of the terminal portion 2 and the current collector portion 3 that are joined by projection welding between the lower end portion 21 of the terminal portion 2 and the upper end portion 31 of the current collector portion 3 . It is the joint portion with the upper end portion 31 of the .
　一方で、集電部３の上端部３１に並設された突起部４のうち、第一突起部４１の高さＨ１と第二突起部４２（４２’）の高さＨ２（Ｈ２’）とが、Ｈ１≧Ｈ２（Ｈ２’）となるように形成した場合、溶接電流や電気抵抗によるジュール熱が第一突起部４１に集中し易くなり、溶接不良であるスパッタが発生する。
また、比率Ｌ／Ｌ０（比率Ｌ’／Ｌ０’）が、０．２５未満となるように第一突起部４１と第二突起部４２（４２’）とを形成した場合、第一突起部４１と第二突起部４２（４２’）との間隔が狭くなるため、溶接電流を通電することで発生するジュール熱が第一突起部４１に集中して、溶接不良であるスパッタが発生する。さらには、爆飛や飛び散りが発生し易くなり、溶接部に空洞が発生して端子極柱１の溶接強度が低下してしまう。
比率Ｌ／Ｌ０（比率Ｌ’／Ｌ０’）が０．５０超過となるように第一突起部４１と第二突起部４２（４２’）とを形成した場合、突起部４の長さが短くなり、端子極柱１の溶接強度が低下する。 On the other hand, among the protrusions 4 arranged side by side on the upper end portion 31 of the current collector 3, the height H1 of the first protrusion 41 and the height H2 ( H2') of the second protrusion 42 (42') ') is formed so that H 1 ≥ H 2 (H 2 '), Joule heat due to welding current and electrical resistance tends to concentrate on the first protrusion 41, and spatter, which is a welding defect, is generated. do.
Further, when the first protrusion 41 and the second protrusion 42 (42') are formed such that the ratio L/L 0 (ratio L'/L 0 ') is less than 0.25, the first protrusion Since the gap between the portion 41 and the second protrusion 42 (42') is narrowed, the Joule heat generated by applying the welding current concentrates on the first protrusion 41, and spatter, which is a poor welding, is generated. . Furthermore, explosion and scattering are likely to occur, and a cavity is generated in the welded portion, resulting in a decrease in the weld strength of the terminal pole column 1 .
When the first protrusion 41 and the second protrusion 42 (42') are formed such that the ratio L/L 0 (ratio L'/L 0 ') exceeds 0.50, the length of the protrusion 4 is shortened, and the welding strength of the terminal pole 1 is lowered.
　なお、本明細書中では、「第一突起部」を集電部３の上端部３１に並設された突起部４のうち、最も高さが低い突起部、「第二突起部」を集電部３の上端部３１に並設された突起部４のうち、第一突起部４１の両隣の突起部と定義する。また、「突起部の高さ」を集電部３の上端部３１から突起部４の頂点までの高さと定義する。さらには、「第一突起部の接続部位」を集電部３の上端部３１と第一突起部４１との接続部分、「第二突起部の接続部位」を集電部３の上端部３１と第二突起部４２（４２’）との接続部分と定義する。また、「ＣＬ２」は一方の第二突起部４２の高さ方向（Ｚ軸方向）の中心線であり、「ＣＬ２’」は他方の第二突起部４２’の高さ方向（Ｚ軸方向）の中心線であり、「Ｈ２」は、一方の第二突起部４２の高さであり、「Ｈ２’」は、他方の第二突起部４２’の高さであり、「Ｌ０」は、第一突起部４１の高さ方向（Ｚ軸方向）の中心線ＣＬ１から一方の第二突起部４２の高さ方向（Ｚ軸方向）の中心線ＣＬ２までの長さであり、「Ｌ０’」は、第一突起部４１の高さ方向（Ｚ軸方向）の中心線ＣＬ１から他方の第二突起部４２’の高さ方向（Ｚ軸方向）の中心線ＣＬ２’までの長さであり、「Ｌ」は、第一突起部４１の接続部位４１１から一方の第二突起部４２の接続部位４２１までの最小長さであり、「Ｌ’」は第一突起部４１の接続部位４１１から他方の第二突起部４２’の接続部位４２１’までの最小長さである。 In the present specification, the “first projection” is the lowest projection among the projections 4 arranged side by side on the upper end 31 of the current collector 3, and the “second projection” is collected. Of the protrusions 4 arranged side by side on the upper end portion 31 of the electrical section 3, the protrusions are defined as the protrusions on both sides of the first protrusion 41. As shown in FIG. Also, the “height of the projection” is defined as the height from the upper end 31 of the current collector 3 to the top of the projection 4 . Further, the “connection portion of the first protrusion” is the connection portion between the upper end portion 31 of the current collector 3 and the first protrusion 41 , and the “connection portion of the second protrusion” is the upper end portion 31 of the current collector 3 . and the second protrusion 42 (42'). Further, “CL 2 ” is the center line in the height direction (Z-axis direction) of one second protrusion 42 , and “CL 2 ′” is the height direction (Z-axis direction) of the other second protrusion 42 ′. direction), “H 2 ” is the height of one second projection 42 , “H 2 ′” is the height of the other second projection 42 ′, and “L 0 ” is the length from the center line CL1 in the height direction (Z-axis direction) of the first protrusion 41 to the center line CL2 in the height direction (Z-axis direction) of one of the second protrusions 42. and "L 0 '" is the center line CL in the height direction (Z-axis direction) of the first protrusion 41 from the center line CL 1 in the height direction (Z-axis direction) of the other second protrusion 42'. 2 ′, “L” is the minimum length from the connecting portion 411 of the first protrusion 41 to the connecting portion 421 of one of the second protrusions 42, and “L′” is the first It is the minimum length from the connecting portion 411 of the protrusion 41 to the connecting portion 421' of the other second protrusion 42'.
　また、第二突起部４２（４２’）の高さＨ２（Ｈ２’）を、Ｈ２≠Ｈ２’となるように形成しても良く、Ｈ２＝Ｈ２’となるように形成しても良く、第一突起部４１の高さＨ１が、一方の第二突起部４２の高さＨ２および他方の第二突起部４２の高さＨ２’よりも低く形成されていれば良い。 In addition, the height H 2 (H 2 ') of the second protrusion 42 (42') may be formed so that H 2 ≠H 2 ', or H 2 =H 2 '. The height H1 of the first protrusion 41 may be formed lower than the height H2 of one second protrusion 42 and the height H2' of the other second protrusion 42. Good luck.
　さらには、第一突起部４１と第二突起部４２（４２’）とを、Ｌ０≠Ｌ０’となるように形成しても良く、Ｌ０＝Ｌ０’となるように形成しても良い。そして、Ｌ≠Ｌ’となるように形成しても良く、Ｌ＝Ｌ’となるように形成しても良い。但し、第一突起部４１と第二突起部４２（４２’）は、比率Ｌ／Ｌ０および比率Ｌ’／Ｌ０’の両方が、０．２５以上０．５０以下となるように形成する。 Furthermore, the first protrusion 41 and the second protrusion 42 (42') may be formed so that L 0 ≠ L 0 ', or L 0 =L 0 '. Also good. Then, it may be formed so that L≠L', or may be formed so that L=L'. However, the first protrusion 41 and the second protrusion 42 (42') are formed so that both the ratio L/L 0 and the ratio L'/L 0 ' are 0.25 or more and 0.50 or less. .
　比率Ｌ／Ｌ０および比率Ｌ’／Ｌ０’は、第一突起部４１または第二突起部４２（４２’）の突起部４の長さを適宜変更することで調整しても良く、第一突起部４１または第二突起部４２（４２’）を並設させる位置を適宜変更することで調整しても良い。なお、本明細書における「突起部の長さ」は、図面中のＸ軸方向の突起部の長さ寸法と定義する。 The ratio L/L 0 and the ratio L'/L 0 ' may be adjusted by appropriately changing the length of the projection 4 of the first projection 41 or the second projection 42 (42'). You may adjust by changing suitably the position which arranges the 1st projection part 41 or the 2nd projection part 42 (42') side by side. In addition, the "length of the protrusion" in this specification is defined as the length dimension of the protrusion in the X-axis direction in the drawings.
また、第一突起部４１の高さＨ１が０．２ｍｍ以上０．４ｍｍ以下であり、第一突起部４１の高さＨ１と第二突起部４２（４２’）の高さＨ２（Ｈ２’）との差が０．１ｍｍ以上０．２ｍｍ以下であることが好ましく、より確実な溶接不良発生の抑制効果を得ることができる。なお、一方の第二突起部４２の高さＨ２と、他方の第二突起部４２’の高さＨ２’とが異なる場合は、Ｈ２－Ｈ１およびＨ２’－Ｈ１が、０．１ｍｍ以上０．２ｍｍ以下となるように、第一突起部４１および第二突起部４２（４２’）を形成するのが好ましい。 Further, the height H1 of the first protrusion 41 is 0.2 mm or more and 0.4 mm or less, and the height H1 of the first protrusion 41 and the height H2 of the second protrusion 42 (42') ( H 2 ′) is preferably 0.1 mm or more and 0.2 mm or less, and a more reliable effect of suppressing the occurrence of defective welding can be obtained. Note that when the height H 2 of one of the second projections 42 and the height H 2 ' of the other second projection 42' are different, H 2 -H 1 and H 2 '-H 1 are It is preferable to form the first projecting portion 41 and the second projecting portion 42 (42') so as to be 0.1 mm or more and 0.2 mm or less.
また、図３に示すように、第一突起部４１は、集電部３の上端部３１の中央に形成することが好ましく、集電部３の上端部３１に並設された突起部のうち、高さが最も低い第一突起部が溶接部の中央に位置するため、ジュール熱が溶接部の中央に集中することをさらに抑制することができ、スパッタや爆飛、飛び散り等の溶接不良の発生をさらに抑制することができる。 Further, as shown in FIG. 3 , the first protrusion 41 is preferably formed in the center of the upper end 31 of the current collector 3 . , Since the first protrusion with the lowest height is located in the center of the welded part, it is possible to further suppress the concentration of Joule heat in the center of the welded part. The occurrence can be further suppressed.
さらには、集電部の上端部に並設された少なくとも３つの突起部のうち、第一突起部４１と、２つの第二突起部４２（４２'）を備え、２つの第二突起部４２（４２'）が、第一突起部４１を中心に、互いに略対称な位置に設けられていることが好ましく、第一突起部４１と２つの第二突起部４２（４２’）をＬ０＝Ｌ０’かつＬ＝Ｌ’の条件を満たすように、設けることが好ましい。 Furthermore, among the at least three protrusions arranged in parallel at the upper end of the current collector, a first protrusion 41 and two second protrusions 42 (42') are provided, and the two second protrusions 42 (42') are preferably provided at substantially symmetrical positions with respect to the first protrusion 41, and the first protrusion 41 and the two second protrusions 42 (42') are L 0 = It is preferable to provide so as to satisfy the conditions of L 0 ′ and L=L′.
　なお、突起部４の形状は特に限定されず、半球状であっても良く、円錐状でも良く、円柱状でも良く、多角錐状でも良く、多角柱状でも良い。また、第一突起部４１と第二突起部４２（４２'）とで形状が異なっていても良い。さらには、集電部の上端部に並設させる突起部４のうち、第一突起部４１および２つの第二突起部４２（４２'）とは別の突起部を、第二突起部４２（４２'）の外方向（Ｘ軸方向）側にさらに設けても良い。 The shape of the protrusion 4 is not particularly limited, and may be hemispherical, conical, cylindrical, polygonal pyramidal, or polygonal columnar. Also, the shape of the first protrusion 41 and the second protrusion 42 (42') may be different. Furthermore, among the protrusions 4 arranged side by side at the upper end of the current collector, the protrusions other than the first protrusion 41 and the two second protrusions 42 (42') are replaced with the second protrusions 42 ( 42') may be further provided on the outward (X-axis direction) side.
次に、本発明の実施例について説明する。但し、本発明は以下の実施例に限定されるものではない。 Next, examples of the present invention will be described. However, the present invention is not limited to the following examples.
　［端子極柱の作製］
（実施例１、２および比較例２）
先ず、図４の端子部２の形状になるように、円柱状の鋼材を切削加工した。次いで、長さ寸法６７．１ｍｍ、幅寸法３５ｍｍ、厚さ寸法３ｍｍの短冊状の鋼材の中央に、高さ寸法０．３ｍｍ（Ｈ１）の第一突起部４１と、高さ寸法０．５ｍｍ（Ｈ２およびＨ２’）の２つの第二突起部４２（４２’）を、金型プレス加工により形成した。その後、図４の集電部３の形状になるように、短冊状の鋼材を逆Ｕ字状に折り曲げた。その際、逆Ｕ字状の鋼材の上端部３１（４．５ｍｍ×３５ｍｍ）に第一突起部４１と第二突起部４２（４２’）とが、上記上端部３１の長手方向に並設されるように折り曲げた。なお、第一突起部４１は上記上端部３１の中央に、２つの第二突起部４２（４２’）は第一突起部４１を中心に互いに略対称な位置に設けた。
比率Ｌ／Ｌ０は、金型プレス加工により２つの第二突起部４２（４２’）を設ける位置を適宜変更して、実施例１で０．２５、実施例２で０．４４、比較例２で０．１０となるように調整した。なお、比率Ｌ’／Ｌ０’は、比率Ｌ／Ｌ０と同じ値である。また、第一突起部４１および第二突起部４２（４２’）の突起径は、４．５ｍｍである。
その後、得られた端子部２と集電部３とを、図１のように溶接装置５に設置して、端子部２の下端部２１と集電部３の突起部４とを当接させて、一対の電極５１により加圧し、溶接電流を通電して端子極柱１を作製した。上記の蓄電池用端子の製造方法を実施例１、２および比較例２とした。 [Fabrication of terminal pole]
(Examples 1 and 2 and Comparative Example 2)
First, a cylindrical steel material was machined so as to have the shape of the terminal portion 2 shown in FIG. Next, a first protrusion 41 with a height dimension of 0.3 mm (H 1 ) and a height dimension of 0.5 mm were placed in the center of a strip-shaped steel material with a length dimension of 67.1 mm, a width dimension of 35 mm, and a thickness dimension of 3 mm. Two second protrusions 42 (42') of (H 2 and H 2 ') were formed by die pressing. After that, the strip-shaped steel material was bent in an inverted U shape so as to form the shape of the current collecting portion 3 shown in FIG. At that time, the first protrusion 41 and the second protrusion 42 (42') are arranged side by side in the longitudinal direction of the upper end 31 (4.5 mm x 35 mm) of the inverted U-shaped steel material. folded like this. The first protrusion 41 is provided at the center of the upper end portion 31, and the two second protrusions 42 (42') are provided at substantially symmetrical positions with the first protrusion 41 as the center.
The ratio L/L 0 was 0.25 in Example 1, 0.44 in Example 2, and 0.44 in Example 2, by appropriately changing the positions where the two second protrusions 42 (42′) were provided by die press working. 2 was adjusted to 0.10. Note that the ratio L'/L 0 ' is the same value as the ratio L/L 0 . Moreover, the projection diameter of the first projecting portion 41 and the second projecting portion 42 (42') is 4.5 mm.
After that, the obtained terminal portion 2 and current collector portion 3 are installed in the welding device 5 as shown in FIG. Then, a pair of electrodes 51 pressurized and a welding current was applied to produce the terminal pole 1 . Examples 1 and 2 and Comparative Example 2 were obtained by manufacturing the storage battery terminal described above.
（実施例３）
第一突起部４１および第二突起部４２（４２’）の突起径を３．０ｍｍとし、比率Ｌ／Ｌ０および比率Ｌ’／Ｌ０’を０．５０としたこと以外は、実施例１と同様に端子極柱１を作製し、この蓄電池用端子の製造方法を実施例３とした。 (Example 3)
Example 1 except that the projection diameter of the first projection portion 41 and the second projection portion 42 (42') was 3.0 mm, and the ratio L/L 0 and the ratio L'/L 0 ' were 0.50. A terminal pole 1 was prepared in the same manner as in , and the method for manufacturing this storage battery terminal was used as Example 3.
（実施例４）
　第一突起部４１の高さ寸法（Ｈ１）を０．２ｍｍとし、２つの第二突起部４２（４２’）を、高さ寸法Ｈ２およびＨ２’が０．４ｍｍとしたこと以外は、実施例１と同様に端子極柱１を作製し、この蓄電池用端子の製造方法を実施例４とした。 (Example 4)
Except that the height dimension (H 1 ) of the first protrusion 41 is set to 0.2 mm, and the height dimensions H 2 and H 2 ' of the two second protrusions 42 (42') are set to 0.4 mm. , the terminal pole 1 was produced in the same manner as in Example 1, and the production method of this storage battery terminal was referred to as Example 4.
（実施例５）
　２つの第二突起部４２（４２’）の高さ寸法Ｈ２およびＨ２’を０．４ｍｍとしたこと以外は、実施例１と同様に端子極柱１を作製し、この蓄電池用端子の製造方法を実施例５とした。 (Example 5)
A terminal pole column 1 was produced in the same manner as in Example 1 except that the height dimensions H 2 and H 2 ′ of the two second protrusions 42 (42′) were set to 0.4 mm, and the storage battery terminal was fabricated. Example 5 was used as the manufacturing method.
（実施例６）
第一突起部４１の高さ寸法Ｈ１を０．４ｍｍとし、２つの第二突起部４２（４２’）の高さ寸法Ｈ２およびＨ２’を０．６ｍｍとしたこと以外は、実施例１と同様に端子極柱１を作製し、この蓄電池用端子の製造方法を実施例６とした。
（比較例３）
　第一突起部４１および第二突起部４２（４２’）の突起径を２．５ｍｍとし、比率Ｌ／Ｌ０および比率Ｌ’／Ｌ０’を０．５８としたこと以外は、実施例１と同様に端子極柱１を作製し、この蓄電池用端子の製造方法を比較例２とした。 (Example 6)
The height dimension H 1 of the first protrusion 41 was set to 0.4 mm, and the height dimensions H 2 and H 2 ' of the two second protrusions 42 (42') were set to 0.6 mm. A terminal pole 1 was produced in the same manner as in Example 1, and the method for producing this storage battery terminal was defined as Example 6.
(Comparative Example 3)
Example 1 except that the projection diameter of the first projection portion 41 and the second projection portion 42 (42') was 2.5 mm, and the ratio L/L 0 and the ratio L'/L 0 ' were 0.58. A terminal pole 1 was prepared in the same manner as in , and this storage battery terminal manufacturing method was used as Comparative Example 2.
（比較例１）
第一突起部４１の高さ寸法Ｈ１および２つの第二突起部４２（４２’）の高さ寸法Ｈ２およびＨ２’を０．５ｍｍとしたこと以外は、実施例１と同様に端子極柱１を作製し、この蓄電池用端子の製造方法を比較例１とした。 (Comparative example 1)
In the same manner as in Example 1 , the terminal An electrode column 1 was produced, and this method for producing a storage battery terminal was referred to as Comparative Example 1.
［溶接性の評価］
（スパッタの発生）
　先ず、実施例１～６および比較例１～３の蓄電池用端子の製造方法により得られた端子極柱の溶接部分におけるスパッタ（溶接不良）の発生を目視で観察した。 [Evaluation of Weldability]
(Generation of spatter)
First, occurrence of spatters (welding defects) in the welded portions of the terminal poles obtained by the manufacturing methods of the storage battery terminals of Examples 1 to 6 and Comparative Examples 1 to 3 was visually observed.
（引張強度試験）
実施例１～６および比較例１～３の蓄電池用端子の製造方法により得られた端子極柱について、上記スパッタの発生の評価を行った後、引張試験装置（島津製作所ＡＧ－１００ｋＮＸ）を用いて、引張速度１５ＭＰａ／ｓｅｃで、引張強度を測定した。 (Tensile strength test)
For the terminal poles obtained by the production methods of storage battery terminals of Examples 1 to 6 and Comparative Examples 1 to 3, after the evaluation of the occurrence of spatter, a tensile tester (Shimadzu Corporation AG-100kNX) was used. Then, the tensile strength was measured at a tensile speed of 15 MPa/sec.
（導電抵抗試験）
　また、実施例１～６および比較例１～３の蓄電池用端子の製造方法で端子極柱をもう１つずつ同様に作製し、上記スパッタの発生および引張強度を評価したものと実質的に同一とみなして、以下の試験により各実施例および各比較例により得られた端子極柱の導電抵抗を測定した。
先ず、端子極柱に４０Ａの電流を流して、直流電圧計を用いて電圧（Ｖ）を測定した。その後、流した電流値と得られた電圧値から、オームの法則により、抵抗値（μΩ）を算出した。 (Conduction resistance test)
In addition, one more terminal pole column was produced in the same manner as in Examples 1 to 6 and Comparative Examples 1 to 3, and the generation of spatter and the tensile strength were evaluated. , the conductive resistance of the terminal pole obtained in each example and each comparative example was measured by the following tests.
First, a current of 40 A was passed through the terminal pole, and the voltage (V) was measured using a DC voltmeter. After that, the resistance value (μΩ) was calculated according to Ohm's law from the applied current value and the obtained voltage value.
　これらの評価結果を表１に示す。 These evaluation results are shown in Table 1.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
表１に示す評価結果から、第一突起部４１の高さＨ１が、２つの第二突起部４２（４２’）の高さＨ２（Ｈ２’）よりも低く、比率Ｌ／Ｌ０および比率Ｌ’／Ｌ０’が０．２５以上０．５０以下である実施例１～６の蓄電池用端子の製造方法により作製した端子極柱は、端子部２と集電部３との溶接部に溶接不良であるスパッタは発生しておらず、引張強度は４０．０～４０．８ｋＮと高く、導電抵抗は３２．３～３４．２μΩと低かった。 From the evaluation results shown in Table 1, the height H 1 of the first protrusion 41 is lower than the height H 2 (H 2 ') of the two second protrusions 42 (42'), and the ratio L/L 0 and the ratio L'/L 0 ' of 0.25 or more and 0.50 or less. No spatter, which is a welding defect, was generated in the part, the tensile strength was as high as 40.0 to 40.8 kN, and the conductive resistance was as low as 32.3 to 34.2 μΩ.
これに対して、第一突起部４１の高さＨ１および２つの第二突起部４２（４２’）の高さＨ２（Ｈ２’）が０．５ｍｍである比較例１の蓄電池用端子の製造方法により作製した端子極柱は、端子部２と集電部３との溶接部に溶接不良であるスパッタが発生しており、引張強度は、実施例１～６の蓄電池用端子の製造方法により作製した端子極柱と比べて２９．５ｋＮと低く、導電抵抗は５６．２μΩと高かった。これは、第一突起部４１の高さＨ１が２つの第二突起部４２（４２’）の高さＨ２（Ｈ２’）と同じであるため、溶接電流を通電することで発生するジュール熱が第一突起部４１に集中して、溶接部にスパッタが発生したと考えられる。また、第一突起部４１へのジュール熱の集中により、爆飛や飛び散りが発生し、溶接部に空洞が生じて、端子極柱の溶接強度が低下し、導電抵抗が上昇したと考えられる。 On the other hand, the storage battery terminal of Comparative Example 1 in which the height H 1 of the first projection 41 and the height H 2 (H 2 ′) of the two second projections 42 (42′) are 0.5 mm In the terminal pole column produced by the manufacturing method of Example 1 to 6, spatter, which is a welding defect, is generated in the welded portion between the terminal portion 2 and the current collector portion 3, and the tensile strength is Compared with the terminal pole produced by the method, the resistance was as low as 29.5 kN and the conductive resistance as high as 56.2 μΩ. This is because the height H 1 of the first protrusion 41 is the same as the height H 2 (H 2 ') of the two second protrusions 42 (42'), so that it is generated by applying the welding current. It is considered that Joule heat was concentrated on the first protrusion 41 and spatter was generated in the welded portion. In addition, it is considered that due to the concentration of Joule heat on the first protrusion 41, explosions and splashes occurred, creating cavities in the welded portion, reducing the welding strength of the terminal pole column, and increasing the conductive resistance.
また、比率Ｌ／Ｌ０および比率Ｌ’／Ｌ０’が０．１０である比較例２の蓄電池用端子の製造方法により作製した端子極柱は、端子部２と集電部３との溶接部に溶接不良であるスパッタが発生しており、引張強度は、実施例１～６の蓄電池用端子の製造方法により作製した端子極柱と比べて２８．８ｋＮと低く、導電抵抗は５８．６μΩと高かった。これは、第一突起部４１と２つの第二突起部４２（４２’）との間隔が狭いため、溶接電流を通電することで発生するジュール熱が第一突起部４１に集中して、溶接部にスパッタが発生したと考えられる。また、第一突起部４１へのジュール熱の集中により、爆飛や飛び散りが発生し易く、溶接部に空洞が生じて、端子極柱の溶接強度が低下し、導電抵抗が上昇したと考えられる。
一方、比率Ｌ／Ｌ０および比率Ｌ’／Ｌ０’が０．５８である比較例３の蓄電池用端子の製造方法により作製した端子極柱の引張強度は、実施例１～６の蓄電池用端子の製造方法により作製した端子極柱と比べて２９．２ｋＮと低く、導電抵抗は５７．３μΩと高かった。これは、第一突起部４１と２つの第二突起部４２（４２’）との間隔は十分に保たれる反面、突起径が短いため、端子極柱の溶接強度が低下し、導電抵抗が上昇したと考えられる。 In addition, the terminal pole pole produced by the method for manufacturing a storage battery terminal of Comparative Example 2, in which the ratio L/L 0 and the ratio L'/L 0 ' are 0.10, was welded between the terminal portion 2 and the current collector portion 3. Spatter, which is a welding defect, occurs in the part, the tensile strength is as low as 28.8 kN and the conductive resistance is 58.6 μΩ compared to the terminal poles produced by the manufacturing method of the storage battery terminal of Examples 1 to 6. was expensive. This is because the distance between the first protrusion 41 and the two second protrusions 42 (42') is narrow, so that the Joule heat generated by applying the welding current concentrates on the first protrusion 41, resulting in welding. It is considered that the spatter occurred in the part. In addition, it is believed that due to the concentration of Joule heat on the first projection 41, explosions and splashes are likely to occur, creating cavities in the welded portion, reducing the welding strength of the terminal pole column, and increasing the conductive resistance. .
On the other hand, the tensile strength of the terminal pole poles produced by the method for manufacturing a storage battery terminal of Comparative Example 3, in which the ratio L/L 0 and the ratio L′/L 0 ′ are 0.58, was lower than that of the storage battery terminals of Examples 1 to 6. Compared to the terminal pole produced by the terminal manufacturing method, the resistance was as low as 29.2 kN and the conductive resistance was as high as 57.3 μΩ. This is because although the distance between the first protrusion 41 and the two second protrusions 42 (42') is sufficiently maintained, the diameter of the protrusion is short, so the welding strength of the terminal pole column is reduced, and the conductive resistance is reduced. considered to have risen.
　したがって、プロジェクション溶接によって端子極柱を形成する蓄電池用端子の製造方法において、集電部の上端部に少なくとも３つの突起部を並設させて、その突起部うち、第一突起部と、２つの第二突起部を設けて、第一突起部を、２つの第二突起部の間に配置し、第一突起部４１の高さＨ１が、２つの第二突起部４２（４２’）の高さＨ２（Ｈ２’）よりも低くし、比率Ｌ／Ｌ０および比率Ｌ’／Ｌ０’が０．２５以上０．５０以下となるようにした蓄電池用端子の製造方法では、その方法により得られる端子極柱の端子部と集電部との溶接部における溶接不良を抑制できることを確認できた。 Therefore, in a method for manufacturing a storage battery terminal in which a terminal pole is formed by projection welding, at least three protrusions are arranged side by side on the upper end of the current collector. A second protrusion is provided, the first protrusion is arranged between the two second protrusions, and the height H1 of the first protrusion 41 is the height of the two second protrusions 42 (42'). In a method for manufacturing a storage battery terminal in which the height is lower than H 2 (H 2 ') and the ratio L/L 0 and the ratio L'/L 0 ' are 0.25 or more and 0.50 or less, the It was confirmed that the welded portion between the terminal portion of the terminal pole obtained by the method and the current collector portion can be prevented from being defective in welding.
１　端子極柱
２　端子部
２１　端子部の下端部
３　集電部
３１　集電部の上端部
４　突起部
４１　第一突起部
４１１　第一突起部の接続部位
４２（４２’）　第二突起部
４２１（４２１’）　第二突起部の接続部位
５　溶接装置
５１　一対の電極
ＣＬ１　第一突起部の高さ方向の中心線
ＣＬ２（ＣＬ２’）　第二突起部の高さ方向の中心線 1 terminal pole 2 terminal portion 21 lower end portion 3 of terminal portion current collecting portion 31 upper end portion of current collecting portion 4 protrusion 41 first protrusion 411 first protrusion connection portion 42 (42') second protrusion 421 (421') Connection portion 5 of the second protrusion Welding device 51 Pair of electrodes CL1 Center line in the height direction of the first protrusion CL2 (CL2') Center line in the height direction of the second protrusion

Claims (5)

  1. 端子部の下端部と、集電部の上端部とをプロジェクション溶接して端子極柱を形成する蓄電池用端子の製造方法であって、
    前記集電部の上端部は、並設された少なくとも３つの突起部を有し、
    　前記突起部のうち、第一突起部と、第二突起部を備え、
    　前記第一突起部は、前記第二突起部の間に位置し、
    　前記第一突起部の高さは、前記第二突起部の高さよりも低く、
    　前記第一突起部の高さ方向の中心線から前記第二突起部の高さ方向の中心線までの長さに対する、前記第一突起部の接続部位から前記第二突起部の接続部位までの最小長さの比率が、０．２５以上０．５０以下であることを特徴とする蓄電池用端子の製造方法。     A method for manufacturing a storage battery terminal in which a terminal pole is formed by projection welding a lower end portion of a terminal portion and an upper end portion of a current collecting portion, the method comprising:
    The upper end of the current collector has at least three protrusions arranged in parallel,
    Among the protrusions, comprising a first protrusion and a second protrusion,
    The first protrusion is located between the second protrusions,
    The height of the first protrusion is lower than the height of the second protrusion,
    The distance from the connecting portion of the first protrusion to the connecting portion of the second protrusion with respect to the length from the center line in the height direction of the first protrusion to the center line in the height direction of the second protrusion A method for manufacturing a storage battery terminal, wherein the minimum length ratio is 0.25 or more and 0.50 or less.
  2. 　前記第一突起部の高さが０．２ｍｍ以上０．４ｍｍ以下であり、
    　前記第一突起部の高さと前記第二突起部の高さとの差が０．１ｍｍ以上０．２ｍｍ以下であることを特徴とする請求項１に記載の蓄電池用端子の製造方法。     The height of the first protrusion is 0.2 mm or more and 0.4 mm or less,
    2. The method of manufacturing a storage battery terminal according to claim 1, wherein the difference between the height of said first protrusion and the height of said second protrusion is 0.1 mm or more and 0.2 mm or less.
  3. 　前記第一突起部が、前記集電部の上端部の中央に配置されていることを特徴とする請求項１または２に記載の蓄電池用端子の製造方法。 The method for manufacturing a storage battery terminal according to claim 1 or 2, characterized in that the first protrusion is arranged at the center of the upper end of the current collector.
  4. 前記突起部のうち、第一突起部と、２つの第二突起部を備え、
    前記２つの第二突起部が、前記第一突起部を中心に、互いに略対称な位置に配置されていることを特徴とする請求項１～３のいずれか一項に記載の蓄電池用端子の製造方法。     Among the projections, a first projection and two second projections,
    The storage battery terminal according to any one of claims 1 to 3, wherein the two second protrusions are arranged at substantially symmetrical positions with respect to the first protrusion. Production method.
  5. 　請求項１～４のいずれか一項で、得た蓄電池用端子を用いたことを特徴とする蓄電池。 A storage battery characterized by using the obtained storage battery terminal according to any one of claims 1 to 4.
PCT/JP2021/043740 2021-03-04 2021-11-30 Method for manufacturing storage battery terminal and storage battery WO2022185634A1 (en)

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JPS5231342A (en) * 1975-09-04 1977-03-09 Yuasa Battery Co Ltd Battery
JP2005268072A (en) * 2004-03-19 2005-09-29 Sanyo Electric Co Ltd Battery and manufacturing method thereof
JP2008288217A (en) * 2008-07-23 2008-11-27 Furukawa Battery Co Ltd:The Alkaline accumulator
JP2010086732A (en) * 2008-09-30 2010-04-15 Panasonic Corp Battery with pin terminal
JP2014032814A (en) * 2012-08-02 2014-02-20 Toyota Industries Corp Power storage device and secondary battery

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Publication number Priority date Publication date Assignee Title
JP5231342B2 (en) 2009-06-18 2013-07-10 川崎重工業株式会社 Cab partition door opening lock device
JP5449961B2 (en) * 2009-09-30 2014-03-19 三洋電機株式会社 Secondary battery
JP7027790B2 (en) * 2017-10-17 2022-03-02 三洋電機株式会社 How to manufacture a secondary battery

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5231342A (en) * 1975-09-04 1977-03-09 Yuasa Battery Co Ltd Battery
JP2005268072A (en) * 2004-03-19 2005-09-29 Sanyo Electric Co Ltd Battery and manufacturing method thereof
JP2008288217A (en) * 2008-07-23 2008-11-27 Furukawa Battery Co Ltd:The Alkaline accumulator
JP2010086732A (en) * 2008-09-30 2010-04-15 Panasonic Corp Battery with pin terminal
JP2014032814A (en) * 2012-08-02 2014-02-20 Toyota Industries Corp Power storage device and secondary battery

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