CN112045307B - 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
CN112045307B
CN112045307B CN202010969586.8A CN202010969586A CN112045307B CN 112045307 B CN112045307 B CN 112045307B CN 202010969586 A CN202010969586 A CN 202010969586A CN 112045307 B CN112045307 B CN 112045307B
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China
Prior art keywords
welding
tab
foil
laser welding
lithium ion
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CN202010969586.8A
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CN112045307A (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)
  • Electrochemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (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. b, placing the battery cell 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 a lithium ion power battery tab, and particularly relates to a laser welding method for a soft package lithium ion power battery tab.
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 the foils with the positive electrodes being aluminum foils and the negative electrodes being copper foils together through 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 prewelding in the step A is 3mm × 40mm.
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 0.8-1mm; 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 0.8-1.2mm.
Further, the distance between the welding line or welding spot of the laser welding in the step D and the tab glue is 1mm.
Further, the thickness of the anode aluminum foil is 12um-25um, and the thickness of the cathode copper foil is 6um-10um. 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 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 of high manufacturing cost of a battery cell caused by serious abrasion of a welding seat of a welding head due to ultrasonic wave 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 the foils with the positive electrodes being aluminum foils and the negative electrodes being copper foils together through 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 cell 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.
And B, the area of the ultrasonic prewelding in the step A is 3mm × 40mm.
And D, performing laser welding in a positive defocusing mode to form larger fusion depth.
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 anode aluminum foil is 0.8-1mm, and the diameter of each welding spot of the cathode copper foil is about 0.8-1mm; when continuous welding is used, 1 welding wire is formed, the width of the positive electrode aluminum foil welding wire is 0.8-1.2mm, and the width of each welding wire of the negative electrode copper foil is about 0.8-1.2mm.
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-10um. 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 an optical 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 should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.

Claims (5)

1. A soft package lithium ion power battery tab laser welding method is characterized by comprising the following steps:
A. welding the foils with the positive electrodes being aluminum foils and the negative electrodes being copper foils together through 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 lug and the foil subjected to pre-welding 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 if pulse welding is performed; if continuous welding is passed, 1 weld line 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 0.8-1mm; when continuous welding is used, 1 welding wire is formed, the width of each welding wire of the positive aluminum foil is 0.8-1.2mm, and the width of each welding wire of the negative copper foil is 0.8-1.2mm;
the thickness of the anode aluminum foil is 12um-25um, and the thickness of the cathode copper foil is 6um-10um; the number of layers of the positive foil and the negative 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.
2. The laser welding method for the soft package lithium ion power battery tab according to claim 1 is characterized in that: and B, the area of the ultrasonic prewelding in the step A is 3mm × 40mm.
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: and D, the distance between the welding wire or welding spot welded in the step D and the tab glue is 1mm.
5. 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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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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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
CN106735898A (en) * 2017-01-13 2017-05-31 上海德朗能动力电池有限公司 The block welding method and welding structure of a kind of lithium ion battery
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
CN108465933B (en) * 2018-02-13 2020-04-07 深圳吉阳智能科技有限公司 Method and device for laser welding of foil and tab
US11095004B2 (en) * 2018-04-02 2021-08-17 GM Global Technology Operations LLC Clamping system and method for laser welding battery foils to a battery tab
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
CN110153558B (en) * 2019-05-30 2021-05-04 深圳德龙激光智能有限公司 Laser welding jig and method for positive and negative pole pieces and lead-out pole lugs of lithium battery cell
CN110948111B (en) * 2019-12-09 2022-02-15 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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