Treatment method for stainless steel shell of lithium battery

A treatment method and stainless steel technology, applied in heat treatment furnaces, heat treatment equipment, coatings, etc., can solve the problems of peeling off the oxide layer on the surface of the parts, environmental pollution of the pickling waste liquid, and difficult to control the size of the parts, and achieve strong anti-fouling ability on the surface. , conducive to large-scale production, the effect of uniform stress

Inactive Publication Date: 2018-03-30
安徽零度新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A method for processing a stainless steel case of a lithium battery. The stainless steel case of a lithium battery is formed by stamping and stretching a SUS304 stainless steel plate with a thickness of 0.45 mm. The annealing process includes the following steps:

[0014] (1) Fill the continuous bright annealing furnace with protective gas, and anneal the stretched stainless steel shell at 420°C for 35 minutes;

[0015] (2) Put the stretch-formed stainless steel shell after the above treatment into the ion nitriding furnace, pass in hydrogen, then start to heat up, and after the temperature rises to 650°C, pass in nitrogen to adjust the volume ratio of nitrogen and hydrogen The ratio is 1:3, the pressure in the furnace is 300Pa, and the temperature is 630°C for 1.2 hours;

[0016] (3) After the step (2) is completed, turn off the nitrogen gas, continue to feed the hydrogen gas, reduce the current and voltage values, cool down to 350°C, and pass into the dry air for surf...

Embodiment 2

[0021] A method for processing a stainless steel case of a lithium battery. The stainless steel case of a lithium battery is formed by stamping and stretching a SUS304 stainless steel plate with a thickness of 0.35 mm. The annealing process includes the following steps:

[0022] (1) Fill the continuous bright annealing furnace with protective gas, and anneal the stretched stainless steel shell at 450°C for 30 minutes;

[0023] (2) Put the stretch-formed stainless steel shell after the above treatment into the ion nitriding furnace, pass in hydrogen, then start to heat up, and after the temperature rises to 650°C, pass in nitrogen to adjust the volume ratio of nitrogen and hydrogen The ratio is 1:2.5, the pressure in the furnace is 400Pa, and the temperature is 620°C for 1.5 hours;

[0024] (3) After the step (2) is completed, turn off the nitrogen gas, continue to feed the hydrogen gas, reduce the current and voltage values, cool down to 360°C, and pass in dry air for surface ...

Embodiment 3

[0029] A method for processing a stainless steel case of a lithium battery. The stainless steel case of a lithium battery is formed by stamping and stretching a SUS304 stainless steel plate with a thickness of 0.55 mm. The annealing process includes the following steps:

[0030] (1) Fill the continuous bright annealing furnace with protective gas, and anneal the stretched stainless steel shell at 400°C for 40 minutes;

[0031] (2) Put the stretch-formed stainless steel shell after the above treatment into the ion nitriding furnace, pass in hydrogen, then start to heat up, and after the temperature rises to 650°C, pass in nitrogen to adjust the volume ratio of nitrogen and hydrogen The ratio is 1:3.5, the pressure in the furnace is 200Pa, and the temperature is 640°C for 1 hour;

[0032] (3) After the step (2) is completed, turn off the nitrogen gas, continue to feed the hydrogen gas, reduce the current and voltage values, cool down to 340°C, and then pass into the dry air for ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/26C21D1/74C21D9/00C23C8/38
CPCC21D1/26C21D1/74C21D9/0068C23C8/38
Inventor 赵小亮
Owner 安徽零度新能源科技有限公司
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