Method for welding lithium ion battery stainless steel head cover and copper sheet
A lithium-ion battery and welding method technology, applied in welding equipment, welding equipment, resistance welding equipment, etc., can solve the problems of operation cost of multi-nickel sheet and copper-nickel composite sheet, occupation of grinding auxiliary time, fast material consumption, etc. To achieve the effect of reducing welding needle grinding assistance time, reducing grinding assistance time, and good electrical conductivity
Active Publication Date: 2014-05-07
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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Problems solved by technology
[0003] The above welding method can be seen and the problems are: 1. It is necessary to combine the copper sheet and the nickel sheet to weld it with the stainless steel top cover of the lithium-ion battery. The process is cumbersome and requires more nickel sheets and copper-nickel composite sheets; 2. Due to its compactness, the molybdenum rod welding needle has low hardness, easy deformation, and general electrical conductivity. It takes up a lot of auxiliary time for grinding during welding, and the material consumption is fast, and there are many false welds.
Method used
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Experimental program
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Embodiment Construction
[0014] A welding method for a stainless steel top cover and a copper sheet of a lithium ion battery, using a tungsten rod as an energy storage welding needle, and then directly welding the stainless steel top cover and the copper sheet of the lithium ion battery through the energy storage welding needle, the steps are as follows:
[0015] (1) Apply copper solder paste: brush the copper sheet with ordinary copper solder paste, the smear point must be at the spot welding position, the smear surface must be uniform, the size of the smear point is 8x8mm, and the thickness is about 0.3mm;
[0016] (2) Adjust the welding parameters: adjust the energy storage spot welder to the appropriate welding parameters according to the specific equipment conditions to ensure that the stainless steel top cover of the lithium-ion battery and the copper sheet are welded firmly and without false welding;
[0017] (3) Energy storage welding: Grind the tip of the tungsten rod welding needle to about 2...
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Abstract
The invention discloses a method for welding a lithium ion battery stainless steel head cover and a copper sheet. A tungsten rod is adopted to serve as an energy storage welding needle, and the lithium ion battery copper head cover and the copper sheet are directly welded through the energy storage welding needle. According to the method, it is guaranteed that the lithium ion battery stainless steel head cover and the copper sheet can be directly welded, internal resistance of a battery is reduced, the cockamamie recombination link of the copper sheet and a nickel sheet during the operation is cancelled, operation cost of the nickel sheet and a copper nickel clad sheet is reduced, auxiliary polishing time of the welding needle is shortened, generation of cold solder joint is reduced, production efficiency is improved and production cost is lowered.
Description
technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a welding method for a stainless steel top cover and a copper sheet of a lithium ion battery. Background technique [0002] At present, power lithium-ion batteries generally use stainless steel top cover. Since the melting point of stainless steel is 1500-1600°C, while the melting point of copper is 1080°C, the stainless steel top cover and copper sheet cannot be directly welded, and nickel or nickel alloy is required as the filler metal material. The general welding method between the stainless steel top cover and the copper sheet of the power lithium-ion battery is to clean the nickel sheet with alcohol first, and then place the copper sheet on the top of the nickel sheet to fit it together, then perform ultrasonic spot welding around it, and then laser around it. Fully welded, welded into a copper-nickel composite sheet and then energy-storage welded with the stainless ste...
Claims
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IPC IPC(8): B23K37/00B23K11/11
CPCB23K11/11B23K11/30B23K11/34
Inventor 徐光银韩成祥
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY