CN112045307A - Laser welding method for soft package lithium ion power battery tab - Google Patents

Laser welding method for soft package lithium ion power battery tab Download PDF

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Publication number
CN112045307A
CN112045307A CN202010969586.8A CN202010969586A CN112045307A CN 112045307 A CN112045307 A CN 112045307A CN 202010969586 A CN202010969586 A CN 202010969586A CN 112045307 A CN112045307 A CN 112045307A
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China
Prior art keywords
welding
tab
laser welding
lithium ion
foil
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CN202010969586.8A
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Chinese (zh)
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CN112045307B (en
Inventor
王卫星
罗朝晖
刘昀
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Tianjin EV Energies Co Ltd
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Tianjin EV Energies Co Ltd
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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
    • B23K26/20—Bonding
    • B23K26/21—Bonding by welding
    • 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
    • B23K26/12—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure
    • 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
    • B23K26/60—Preliminary treatment
    • 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
    • B23K26/70—Auxiliary operations or equipment
    • B23K26/702—Auxiliary equipment
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • 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
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/36—Electric or electronic devices
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Laser Beam Processing (AREA)

Abstract

The invention provides a soft package lithium ion power battery tab laser welding method, which comprises the following steps: A. ultrasonically welding a plurality of foils together; B. placing a battery core tab on the upper surface of the foil processed in the step A; C. in the step B, the battery cell tab and the foil subjected to prewelding are tightly pressed and attached until no gap exists; D. performing laser welding on the upper surface of the battery cell tab, and forming 1 row or two rows of welding spots through pulse welding; by continuous welding, 1 weld line was formed. The invention has the beneficial effects that: by using laser welding, the phenomena of insufficient soldering, solder cracking, poor foil covering amount and the like existing in the ultrasonic welding at present can be solved.

Description

Laser welding method for soft package lithium ion power battery tab
Technical Field
The invention belongs to the technical field of welding of tabs of lithium ion power batteries, and particularly relates to a laser welding method for tabs of soft package lithium ion power batteries.
Background
At present in the soft packet of core package utmost point ear welding process of lithium ion, what use the welding mode to adopt is ultrasonic bonding, but ultrasonic bonding foil and utmost point ear often take place following problem: the welding cold joint has excessive through-welding burr, insufficient tension and unstable foil covering amount. The resistance that will cause electric core like this is big, and the heavy current is filled and is charged the electricity core and generate heat great, also has very big influence to the battery package moreover, and the vehicle often takes place phenomenons such as the nest of lying prone, all brings harmful effects for the preparation of electric core and the use of battery.
Disclosure of Invention
In view of the above, the invention aims to provide a soft-package lithium ion power battery tab laser welding method to solve the shortcomings of the above problems.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a laser welding method for a soft package lithium ion power battery tab comprises the following steps:
A. welding a plurality of layers of foils with aluminum foils as anodes and copper foils as cathodes together by ultrasonic waves;
B. placing a battery core lug with an aluminum lug as an anode and a copper lug as a cathode on the upper surface of the foil processed in the step A;
C. in the step B, the battery cell tab and the foil subjected to prewelding are tightly pressed and attached until no gap exists;
D. performing laser welding on the upper surface of the battery core tab, and forming 1 row or two rows of welding spots if pulse welding is performed; if continuous bonding is used, 1 bond wire or a plurality of bond wires are formed.
Further, the area of the ultrasonic pre-welding in the step A is 3mm by 40 mm.
Further, the laser welding in the step D is a positive defocusing welding.
Further, when pulse welding is used in the step D, 1 row or two rows of welding points are formed, the diameter of each welding point of the positive aluminum foil is 0.8-1mm, and the diameter of each welding point of the negative copper foil is about 0.8-1 mm; when continuous welding is used, 1 welding wire is formed, the width of the positive aluminum foil welding wire is 0.8-1.2mm, and the width of each welding wire of the negative copper foil is about 0.8-1.2 mm.
Further, the distance between the welding line or welding spot of the laser welding in the step D and the tab glue is 1 mm.
Further, the thickness of the anode aluminum foil is 12um-25um, and the thickness of the cathode copper foil is 6um-10 um. The number of layers of the positive electrode foil and the negative electrode foil is less than or equal to 60.
Furthermore, the thickness of the positive pole lug is 0.2mm-0.4mm, the thickness of the negative pole lug is 0.2mm-0.3mm, and the number of the battery cell lugs is one.
Further, nitrogen or argon is blown during the laser welding in the step D.
Compared with the prior art, the laser welding method for the soft-package lithium ion power battery tab has the following advantages:
the laser welding method for the soft-package lithium ion power battery tab disclosed by the invention uses a laser welding technology, can solve the problems of insufficient welding, welding crack, poor foil covering amount and the like existing in ultrasonic welding at present, and simultaneously, avoids the problem that the manufacturing cost of a battery cell is high because the welding seat of a welding head is seriously abraded by taking ultrasonic waves as contact welding, namely the manufacturing cost is saved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a flow chart of a soft-package lithium ion power battery tab laser welding method according to an embodiment of the invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1, a soft-package lithium ion power battery tab laser welding method includes the following steps:
A. welding a plurality of layers of foils with aluminum foils as anodes and copper foils as cathodes together by ultrasonic waves;
B. placing a battery core lug with an aluminum lug as an anode and a copper lug as a cathode on the upper surface of the foil processed in the step A;
C. b, pressing and attaching the battery cell lug and the pre-welded foil until no gap exists, welding an aluminum foil and an aluminum lug, and welding a copper foil and a copper lug; if a gap exists, abnormal phenomena such as burning-through of a battery cell tab and the like can occur;
D. performing laser welding on the upper surface of the battery core tab, and forming 1 row or two rows of welding spots if pulse welding is performed; if continuous bonding is used, 1 bond wire or a plurality of bond wires are formed.
The area of the ultrasonic pre-welding in the step A is 3mm by 40 mm.
And D, the laser welding in the step D is in a positive defocusing mode, and a larger fusion depth is formed.
When pulse welding is used in the step D, 1 row or two rows of welding spots are formed, the diameter of each welding spot of the positive aluminum foil is 0.8-1mm, and the diameter of each welding spot of the negative copper foil is about 0.8-1 mm; when continuous welding is used, 1 welding wire is formed, the width of the positive aluminum foil welding wire is 0.8-1.2mm, and the width of each welding wire of the negative copper foil is about 0.8-1.2 mm.
And D, the distance between the welding line or welding spot of the laser welding in the step D and the tab glue is 1mm, and the tab cannot be burnt by the laser welding.
The thickness of the anode aluminum foil is 12um-25um, and the thickness of the cathode copper foil is 6um-10 um. The number of layers of the positive electrode foil and the negative electrode foil is less than or equal to 60.
The thickness of the positive pole lug is 0.2mm-0.4mm, the thickness of the negative pole lug is 0.2mm-0.3mm, and the number of the battery cell lugs is one.
And D, blowing nitrogen or argon during laser welding to protect the copper lug and the aluminum lug from being oxidized.
And D, welding by adopting a fiber laser with the brand of IPG.
In the embodiment, the laser welding is used, so that the problems of welding quality of the current production line, such as insufficient solder joint, solder crack, poor foil covering amount and the like, can be solved; the efficiency of the welding line can be improved because the time for welding the laser is about 0.5S.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (8)

1. A soft package lithium ion power battery tab laser welding method is characterized by comprising the following steps:
A. welding a plurality of layers of foils with aluminum foils as anodes and copper foils as cathodes together by ultrasonic waves;
B. placing a battery core tab with an aluminum tab as a positive electrode tab and a copper tab as a negative electrode tab on the upper surface of the foil processed in the step A;
C. in the step B, the battery cell tab and the foil subjected to prewelding are tightly pressed and attached until no gap exists;
D. performing laser welding on the upper surface of the battery core tab, and forming 1 row or two rows of welding spots if pulse welding is performed; if continuous bonding is used, 1 bond wire or a plurality of bond wires are formed.
2. The laser welding method for the soft package lithium ion power battery tab according to claim 1 is characterized in that: the area of the ultrasonic pre-welding in the step A is 3mm by 40 mm.
3. The laser welding method for the soft package lithium ion power battery tab according to claim 1 is characterized in that: and D, the laser welding in the step D is in a positive defocusing mode.
4. The laser welding method for the soft package lithium ion power battery tab according to claim 1 is characterized in that: when pulse welding is used in the step D, 1 row or two rows of welding spots are formed, the diameter of each welding spot of the positive aluminum foil is 0.8-1mm, and the diameter of each welding spot of the negative copper foil is about 0.8-1 mm; when continuous welding is used, 1 welding wire is formed, the width of the positive aluminum foil welding wire is 0.8-1.2mm, and the width of each welding wire of the negative copper foil is about 0.8-1.2 mm.
5. The laser welding method for the soft package lithium ion power battery tab according to claim 4 is characterized in that: and D, the distance between the welding line or welding spot welded in the step D and the tab glue is 1 mm.
6. The laser welding method for the soft package lithium ion power battery tab according to claim 1 is characterized in that: the thickness of the anode aluminum foil is 12um-25um, and the thickness of the cathode copper foil is 6um-10 um. The number of layers of the positive electrode foil and the negative electrode foil is less than or equal to 60.
7. The laser welding method for the soft package lithium ion power battery tab according to claim 4 is characterized in that: the thickness of the positive pole lug is 0.2mm-0.4mm, the thickness of the negative pole lug is 0.2mm-0.3mm, and the number of the battery cell lugs is one.
8. The laser welding method for the soft package lithium ion power battery tab according to claim 1 is characterized in that: and D, blowing nitrogen or argon during laser welding.
CN202010969586.8A 2020-09-15 2020-09-15 Laser welding method for soft package lithium ion power battery tab Active CN112045307B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113488745A (en) * 2021-06-04 2021-10-08 天津市捷威动力工业有限公司 Laser welding process for positive pole lug of soft package lithium ion power battery
CN113751906A (en) * 2021-08-31 2021-12-07 惠州亿纬锂能股份有限公司 Lug welding method, battery core lug and battery

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CN107335916A (en) * 2017-06-29 2017-11-10 大族激光科技产业集团股份有限公司 A kind of cylindrical battery pole ear welding method
KR20180023634A (en) * 2016-08-26 2018-03-07 주식회사 엘지화학 Welding method for electrode tab of secondary battery and electrode tab welding structure produced by the same
CN108465933A (en) * 2018-02-13 2018-08-31 深圳吉阳智能科技有限公司 A kind of method and apparatus of laser welding foil and lug
CN110153558A (en) * 2019-05-30 2019-08-23 深圳德龙激光智能有限公司 A kind of laser welding jig and method of lithium battery electric core positive/negative plate and extraction tab
CN110340549A (en) * 2018-04-02 2019-10-18 通用汽车环球科技运作有限责任公司 Grasping system and method for being laser-welded to battery foil on battery pole ear
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CN110948111A (en) * 2019-12-09 2020-04-03 多氟多新能源科技有限公司 Composite welding method for tab of soft package lithium ion battery

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CN107335916A (en) * 2017-06-29 2017-11-10 大族激光科技产业集团股份有限公司 A kind of cylindrical battery pole ear welding method
CN108465933A (en) * 2018-02-13 2018-08-31 深圳吉阳智能科技有限公司 A kind of method and apparatus of laser welding foil and lug
CN110340549A (en) * 2018-04-02 2019-10-18 通用汽车环球科技运作有限责任公司 Grasping system and method for being laser-welded to battery foil on battery pole ear
CN110587127A (en) * 2018-06-12 2019-12-20 大族激光科技产业集团股份有限公司 Method for welding battery tab and bus bar
CN110153558A (en) * 2019-05-30 2019-08-23 深圳德龙激光智能有限公司 A kind of laser welding jig and method of lithium battery electric core positive/negative plate and extraction tab
CN110948111A (en) * 2019-12-09 2020-04-03 多氟多新能源科技有限公司 Composite welding method for tab of soft package lithium ion battery

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113488745A (en) * 2021-06-04 2021-10-08 天津市捷威动力工业有限公司 Laser welding process for positive pole lug of soft package lithium ion power battery
CN113751906A (en) * 2021-08-31 2021-12-07 惠州亿纬锂能股份有限公司 Lug welding method, battery core lug and battery

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