Method for manufacturing safety vent on cover of lithium-ion battery

Abstract

A method for manufacturing a safety vent on a cover of a lithium-ion battery has punching the cover to form an annular recess and the cover made of aluminum alloy; heating the annular recess to a temperature between 200° C.˜500° C.; cooling the annular recess; and obtaining the safety vent on the cover of the lithium-ion battery. The aluminum alloy can be heated to a specific temperature for lowering its stress, so a thickness between a lower surface of the cover and a bottom of the annular recess is neither necessary to be precisely controlled, so retaining yield of lithium-ion batter

Dependencies are inferred from the claim text.