Treatment method for stainless steel shell of lithium battery

Abstract

The invention belongs to the technical field of machining of a stainless steel shell of a lithium battery, and particularly relates to a treatment method for the stainless steel shell of the lithium battery. The stainless steel shell of the lithium battery is formed by stamping and stretching a stainless steel plate SUS304 with the thickness ranging from 0.35 mm to 0.55 mm. The annealing process of the stainless steel shell of the lithium battery comprises the following steps of annealing in protective gas, ion nitriding furnace treatment and correcting and cooling. Compared with the prior art, the treatment method for the stainless steel shell of the lithium battery has the following beneficial effects that by means the method, the surface cannot be oxidized while the stress is removed, acompact protection film is formed on the surface of the stainless steel shell, the shell hardness and the corrosion resistance of the material can be improved, the surface anti-pollution capacity ishigh, toxic and harmful substances cannot be generated in the production process, meanwhile, the stress of the obtained material is uniform, the acid pickling process is omitted, the environmental pollution is avoided, the conditions in the machining process are controllable, and scale production is facilitated.

Description

technical field [0001] The invention belongs to the technical field of processing stainless steel shells of lithium batteries, and in particular relates to a processing method for stainless steel shells of lithium batteries. Background technique [0002] The cylindrical stainless steel lithium battery casing will produce stress after stamping and stretching, so it needs to be annealed. The traditional treatment method is stretching once, annealing and pickling once, and generally four times of stretching, that is, It is said that each shell has to undergo four annealing and pickling processes before the finished product can be obtained. Therefore, the finished stainless steel shell is likely to cause the oxide layer on the surface of the part to fall off due to multiple annealing and pickling, and excessive pickling will also cause serious surface defects. It needs to be compensated by grinding and polishing process, so it is difficult to control the size of the parts. Moreo...

AI Technical Summary

Problems solved by technology

[0002] The cylindrical stainless steel lithium battery casing will produce stress after stamping and stretching, so it needs to be annealed. The traditional treatment method is stretching once, annealing and pickling once, and generally four times of stretching, that is, It is said that each shell has to undergo four annealing and pickling processes before the finished product can be obtained. Therefore, the finished stainless steel shell is likely to cause the oxide layer on the surface of the part to fall off due to multiple annealing and pickling, and excessive pickling will also cause serious surface defects. It needs to be compensated by the grinding and polishing process, so it is difficult to control the size of the parts, and a large amount of pickling waste will pollute the environment. Therefore, further research on how to properly treat the stainless steel lithium battery casing is required