A method of manufacturing a battery electrode terminal

Abstract

The invention discloses a method for manufacturing battery electrode terminals, comprising the following steps: cleaning, using a weak alkaline cleaning agent to clean and dry an aluminum pole; coating solder paste, metallizing the ceramic welding part, and then plating the ceramic with nickel; Solder paste coating; assembly, the aluminum pole and ceramics are assembled to form electrode terminals; brazing, the electrode terminals to be brazed after assembly are brazed in a nitrogen-protected continuous mesh belt furnace; surface treatment, brazing The final electrode terminals were cleaned in a cleaning agent at 65°C for 5-10 minutes, and then rinsed with hot water. In the battery electrode terminal manufacturing method of the present invention, on the basis of the original metallized ceramics and aluminum brazing, by selecting the aluminum-silicon solder that can be well infiltrated with aluminum and ceramics under a nitrogen atmosphere, the kvar transition metal sheet is reduced, and nitrogen protection is used. The continuous mesh belt furnace is used for brazing, which reduces material costs and energy consumption, and improves the qualified rate of electrode terminals and production efficiency.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a method for manufacturing battery electrode terminals. Background technique [0002] In recent years, the rapid increase of electric vehicles, energy storage, and smart grids has triggered the explosive growth of power batteries, and square lithium iron phosphate power batteries have occupied a considerable share, and the supply has been in short supply. Electrode terminals with aluminum and ceramic brazing structures in power batteries are gradually replacing electrode terminals with plastic soft connections, and it has become a trend. [0003] Some enterprises use the brazing scheme of metallized ceramics and aluminum poles in the electrode terminals of power batteries, but it is mainly realized by adding kvar transition metal sheets between the aluminum poles and metallized ceramics. Although the way of the transition piece solves the problem of the large difference in e...

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Problems solved by technology

[0003] Some enterprises use the brazing scheme of metallized ceramics and aluminum poles in the electrode terminals of power batteries, but it is mainly realized by adding kvar transition metal sheets between the aluminum poles and metallized ceramics. Although the way of the transition piece solves the problem of the large difference in expansion coefficient between the aluminum pole and the ceramic to a certain extent, the disadvantage of this way is that after adding the Kovar metal piece, the brazing position changes from one to two. (Ceramic and Kovar metal brazing, Kovar metal and aluminum brazing), which is equivalent to changing from one leak point to two, and this method is more complicated to assemble, and the material cost and production cost are higher

[0004] At present, some people study the eutectic sintering process and use the method of scraping brazing to realize the low-temperature connection between ceramics and aluminum. This connection method is currently limited to the research of a small number of samples in universities and has not been applied to actual production; there are also studies The vacuum brazing connection of ceramics and aluminum alloys has low production efficiency and high energy consumption, which is not conducive to mass production; hydrogen or ammonia decomposition hydrogen is also used to form a reducing atmosphere in an aluminum brazing furnace for brazing. The method has high requirements on the plant and operators, and if the hydrogen is used improperly, it will also form a huge safety hazard

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