WO2023243387A1 - 接合方法 - Google Patents

接合方法 Download PDF

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Publication number
WO2023243387A1
WO2023243387A1 PCT/JP2023/020014 JP2023020014W WO2023243387A1 WO 2023243387 A1 WO2023243387 A1 WO 2023243387A1 JP 2023020014 W JP2023020014 W JP 2023020014W WO 2023243387 A1 WO2023243387 A1 WO 2023243387A1
Authority
WO
WIPO (PCT)
Prior art keywords
laser
welding
lead
strap
joining
Prior art date
Application number
PCT/JP2023/020014
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
拓矢 巽
Original Assignee
株式会社Ｇｓユアサ
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 株式会社Ｇｓユアサ filed Critical 株式会社Ｇｓユアサ
Priority to JP2024528667A priority Critical patent/JPWO2023243387A1/ja
Publication of WO2023243387A1 publication Critical patent/WO2023243387A1/ja

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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
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
    • B23K26/073—Shaping the laser spot
    • 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
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/20—Bonding
    • B23K26/21—Bonding by 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
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/534—Electrode connections inside a battery casing characterised by the material of the leads or tabs
    • 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
    • H01M50/562—Terminals characterised by the material
    • 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
    • H01M50/564—Terminals characterised by their manufacturing process
    • H01M50/566—Terminals characterised by their manufacturing process by welding, soldering or brazing

Definitions

  • the present invention relates to a lead-acid battery manufacturing technology.
  • Patent Document 1 discloses laser welding of a lead bushing integrally cast into the lid of a lead-acid battery and a pole pole inserted through the lead bushing. Laser welding produces less CO2 than gas burners.
  • the pole post 2 and the bushing 1 are made of lead or a lead alloy, and it is generally preferable to use the same material for both. If pole post 2 and bushing 1 are made of lead alloy, various lead alloys such as Pb-Ca alloy, Pb-Ca-Sn alloy, Pb-Sn alloy, Pb-Sb alloy can be used and are applicable to laser welding.
  • Pb-Ca alloys which are particularly susceptible to oxidation, is coated with a black oxide film by the air, which increases the ability to absorb laser beams, making it convenient for relatively deep welding by laser welding. understood.
  • paragraph 24 of Patent Document 1 includes the following description.
  • oxygen or air is discharged at a desired discharge pressure into the shield cylinder 70 from the respective discharge holes 14, 14, . . . using a compression pump.
  • the oxygen or air is discharged toward the opening surface of the cylindrical lower end portion 70a1, that is, toward the terminal portion T. Note that in this case, it is common to use air, which is economically preferable.
  • This oxygen or air oxidizes the surface of the welded portion 8 during welding, thereby suppressing the reflection of laser light and making it possible to more efficiently perform welding using laser irradiation light.
  • An object of the present invention is to maintain welding quality by ensuring fluidity of molten metal while suppressing the generation of CO 2 during welding.
  • This technology can suppress the generation of CO 2 during welding, ensure fluidity of molten metal, and maintain welding quality.
  • FIG. 1 Perspective view of lead acid battery Perspective view of battery case Front view of lead-acid battery (partial cross-section) Cross section of lead acid battery Diagram showing the laser welding process Enlarged view of Figure 5 Diagram showing weld depth Plan view of external terminal and strap after laser welding Block diagram of laser welding equipment Diagram showing the difference in beam shape of laser light Diagram showing other embodiments Diagram showing other embodiments
  • At least one of the first member and the second member may be made of a lead alloy containing Ca.
  • Lead alloys containing Ca are more easily oxidized than lead alloys that do not contain Ca. Therefore, an oxide film tends to form on the surface of the molten metal, and the fluidity of the molten metal tends to decrease.
  • a gap may be formed between the first member and the second member before they are joined.
  • the first member and the second member may be joined by melting the base material around the gap with laser light to fill the gap.
  • the gap formed between the first member and the second member is filled with a molten bead, the amount of weld penetration (welding depth) can be ensured. Therefore, it is effective in maintaining the welding quality of the joint.
  • the beam shape of the laser light may be a linear shape.
  • the first member and the second member may be joined by scanning the laser beam along the gap.
  • Laser light can be applied to a wider area, making it possible to weld in a shorter time. Therefore, the manufacturing efficiency of lead-acid batteries can be improved.
  • the first member may be a strap
  • the second member may be a connecting terminal electrically connected to the strap via a connecting portion.
  • the strap and the connecting portion may be laser welded while supplying the inert gas.
  • Lead-acid battery 1 The structure of lead-acid battery 1 will be described with reference to FIG.
  • the lead-acid battery 1 is used, for example, as a power source for mobile bodies such as motorcycles and automobiles.
  • the lead-acid battery 1 includes a container 10 consisting of a battery case 11 made of synthetic resin and a lid member 16 made of synthetic resin.
  • the battery case 11 has four outer walls 12 and a bottom wall 13, and is box-shaped with an open top.
  • the battery case 11 is partitioned into six cell chambers 15 by five partition walls 14.
  • the lid member 16 is thermally welded to the battery case 11 and closes the opening 11A of the battery case 11.
  • the lid member 16 includes a flat plate portion 17, an overhanging portion 18, and an outer peripheral wall 19.
  • the projecting portion 18 projects upward from the flat plate portion 17 in a substantially T-shape.
  • the outer peripheral wall 19 extends downward from the outer peripheral edge of the flat plate portion 17 and surrounds the upper end of the outer wall 12 of the battery case 11.
  • the lead acid battery 1 further includes an electrode plate group 21, a strap 25, a positive external terminal 30P, and a negative external terminal 30N.
  • the electrode plate group 21 is made up of positive electrode plates 22P and negative electrode plates 22N alternately stacked in the X direction with separators 23 in between.
  • Each of the electrode plates 22P and 22N has a structure in which a grid body is filled with an active material.
  • the electrode plate group 21 is accommodated in each cell chamber 15 together with an electrolytic solution made of dilute sulfuric acid.
  • the strap 25 is made of lead alloy. Specifically, Pb-Ca alloy, Pb-Ca-Sn alloy, Pb-Sn alloy, Pb-Sb alloy, etc. can be used. As shown in FIGS. 3 and 4, each of the electrode plates 22P and 22N has an ear portion 24 at the top. The strap 25 connects the ears 24 of the polar plates 22P and 22N of the same polarity within one cell chamber 15.
  • the positive external terminal 30P and the negative external terminal 30N are made of lead alloy. Specifically, Pb-Ca alloy, Pb-Ca-Sn alloy, Pb-Sn alloy, Pb-Sb alloy, etc. can be used. As shown in FIG. 3, the positive external terminal 30P and the negative external terminal 30N are located on both sides of the upper surface of the lid member 16 in the X direction.
  • the positive external terminal 30P consists of a terminal portion 31, a pole post 33, and a connecting portion 35.
  • the terminal portion 31 has a generally block shape.
  • a load or a charger is connected to the terminal portion 31 via a harness terminal (not shown).
  • the pole pillar 33 is located below the terminal portion 31 and is located below the flat plate portion 17 in relation to the lid member 16.
  • the pole column 33 has a cylindrical shape.
  • the pole column 33 has a plurality of annular ribs 34 on its outer peripheral surface.
  • a resin portion 40 is provided on the pole pillar 33 so as to cover the annular rib 34.
  • the upper part of the resin part 40 is welded to the bottom surface of the flat plate part 17.
  • the connecting portion 35 projects horizontally (to the right in FIG. 4) from the bottom of the pole post 33.
  • the connecting portion 35 is generally block-shaped.
  • the positive external terminal 30P is connected to the strap 25 via the connecting portion 35.
  • the negative electrode external terminal 30N has the same structure as the positive electrode, and is connected to the strap 25 via the connecting portion 35.
  • the strap 25 corresponds to the "first member” of the present invention
  • the positive external terminal 30P and the negative external terminal 30N correspond to the "connection terminal, second member" of the present invention.
  • the strap 25 and the connecting portion 35 are positioned on a horizontal base 80 so that they are not tilted using a jig or the like.
  • a groove U is formed.
  • the weld groove U corresponds to the "gap" of the present invention.
  • inert gas G is supplied around the welding groove U.
  • the inert gas G is a gas that does not easily cause an oxidation reaction, such as argon gas or nitrogen gas.
  • laser light L is irradiated from the laser head 155 and scanned along the welding groove U (see FIG. 6).
  • the scanning direction of the laser beam L is indicated by an arrow.
  • FIG. 8 is a plan view of the strap 25 and the connection part 35, where the strap 25 is joined to the connection part 35 over its entire width.
  • the laser head 155 has an axis R obliquely inclined (indicated by an angle ⁇ ) with respect to the vertical reference line LZ, and with respect to the weld groove U. , irradiate the laser beam L obliquely.
  • FIG. 9 is a block diagram (an example) of the laser welding apparatus 100.
  • the laser welding apparatus 100 includes a welding stage 110, a laser oscillator 120, an optical fiber 130, a laser head unit 150, a chiller 160, a gas supply source 170, a jetting head 180, and the like.
  • the ejection head 180 is arranged above the welding stage 110 and supplies the inert gas G supplied from the gas supply source 170 to the object (lead acid battery 1) on the welding stage 110.
  • the laser oscillator 120 is a solid state laser oscillator such as a fiber laser or a YAG laser.
  • the output form of the laser oscillator 120 may be a CW output that continuously generates laser light, or a pulse output that outputs intermittently.
  • the head unit 150 includes a galvano scanner 151 and a laser head 155, and is connected to the laser oscillator 120 by an optical fiber 130.
  • the laser head 155 includes a condenser lens (not shown).
  • the head unit 150 is a single mode and focuses the laser light to form a circular spot.
  • the head unit 150 is disposed above the welding stage 110, and irradiates the object (lead acid battery 1) on the welding stage 110 with the laser beam L downward from the laser head 155, and uses the galvano scanner 151 to irradiate the laser beam L downward. can be scanned onto the object (lead acid battery 1).
  • Step 1 Strap 25 is integrally molded to ear portions 24 of electrode plates 22P and 22N. Molding methods include burning method and COS (cast-on strap).
  • Step 2 Insert the electrode plate group 21 integrally molded with the strap 25 halfway into the battery case 11.
  • Step 3 While supplying inert gas G, the strap 25 and the connecting portion 35 are joined by laser welding (see FIG. 5). Both members 25 and 35 are joined at the positive external terminal 30P and the negative external terminal 30N, respectively.
  • Step 4 Insert the electrode plate group 21 deep into the battery case 11, and then heat-seal the lid member 16 to the battery case 11.
  • the inert gas G in combination, it is possible to suppress the formation of an oxide film on the surface of the molten metal, so the fluidity of the molten metal can be maintained.
  • the welding groove U is V-shaped, the molten metal can easily reach deep inside. Therefore, it is easy to ensure the amount of weld penetration (welding depth D).
  • Embodiment 2 differs from Embodiment 1 in the shape of the laser beam, which is a line shape (straight line shape) as shown by reference numeral 156 in FIG. Specifically, it has a line shape perpendicular to the weld groove U.
  • both members located across the welding groove U can be irradiated with the laser beam L at the same time.
  • a method of making the laser beam into a line shape there are, for example, a method of using a dedicated condensing lens and a method of using a diffractive optical element.
  • the laser welded joints were the strap 25 and the connecting portion 35.
  • the joining location is not limited to the example of the embodiment.
  • the bushing 210 and the pole post 220 may be laser welded (part A) by irradiating the laser beam L in a circular orbit from above the pole post 220 along the outer periphery of the upper surface of the pole post 220. good.
  • a solid-state laser is used for the laser oscillator 120.
  • Laser oscillator 120 may be a gas laser.
  • a CO2 laser may be used.
  • the welding groove U has a V-shape, but it may have a shape other than the V-shape.
  • the lower end of the strap 25 and the lower end of the connecting part 35 are brought into contact with each other, but in the state before laser welding, there is a gap between the strap 25 and the connecting part 35. If there is, it is not necessarily necessary that they are in contact.
  • the strap 25 and the connecting portion 35 may be separated from each other before laser welding. Then, the strap 25 and the connecting portion 35 may be joined by melting the base material around the gap G formed between them with the laser beam L to fill the gap G.
  • the axis R of the laser head 155 was angled, and the welding groove U was irradiated with the laser light L obliquely.
  • the laser beam may be irradiated straight down onto the welding groove U from directly above without using an angle.
  • the output of the laser beam L was constant during welding, but the output may be switched. For example, the output may be low at the initial stage of welding, and high output thereafter.
  • Lead-acid battery 25 Strap (corresponding to the "first member” of the present invention) 30P, 30N Positive external terminal, negative external terminal (corresponding to the "second member” of the present invention) 33 Pole column part 35 Connection part 40 Resin part 100 Laser welding device 120 Laser oscillator 155 Laser head 170 Gas supply source 180 Ejection head U Welding groove (corresponding to the "gap" of the present invention)

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Connection Of Batteries Or Terminals (AREA)
PCT/JP2023/020014 2022-06-14 2023-05-30 接合方法 WO2023243387A1 (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2024528667A JPWO2023243387A1 (enrdf_load_stackoverflow) 2022-06-14 2023-05-30

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022-095777 2022-06-14
JP2022095777 2022-06-14

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WO2023243387A1 true WO2023243387A1 (ja) 2023-12-21

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PCT/JP2023/020014 WO2023243387A1 (ja) 2022-06-14 2023-05-30 接合方法

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JP (1) JPWO2023243387A1 (enrdf_load_stackoverflow)
WO (1) WO2023243387A1 (enrdf_load_stackoverflow)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS634312B2 (enrdf_load_stackoverflow) * 1981-02-25 1988-01-28 Shin Kobe Electric Machinery
JPH10302760A (ja) * 1997-04-30 1998-11-13 Yuasa Corp 蓄電池
JP2005190773A (ja) * 2003-12-25 2005-07-14 Japan Storage Battery Co Ltd 鉛蓄電池
US20150303436A1 (en) * 2012-01-13 2015-10-22 Energy Power Systems LLC Method of manufacturing a lead-acid battery

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS634312B2 (enrdf_load_stackoverflow) * 1981-02-25 1988-01-28 Shin Kobe Electric Machinery
JPH10302760A (ja) * 1997-04-30 1998-11-13 Yuasa Corp 蓄電池
JP2005190773A (ja) * 2003-12-25 2005-07-14 Japan Storage Battery Co Ltd 鉛蓄電池
US20150303436A1 (en) * 2012-01-13 2015-10-22 Energy Power Systems LLC Method of manufacturing a lead-acid battery

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