Manufacturing method of lithium iron phosphate battery capable of resisting storage at ultrahigh temperature of 95 DEG C

The invention provides a manufacturing method of a lithium iron phosphate battery capable of resisting storage at the ultra-high temperature of 95 DEG C. The method comprises the following steps: step 1, after liquid injection, a battery cell is normally put into a cabinet for pre-formation, an air bag is reserved, and pre-charging is performed by 15-25%; secondly, the lower cabinet is subjected to primary air exhaust on packaging equipment, and then pre-packaging is conducted; the process can eliminate polarization products in the formation process of the pre-formed SEI film, so that the SEI film is formed more stably, and high-temperature storage is facilitated; step 3, performing pre-formation in the cabinet again, and after constant-current charging is performed for a period of time, performing constant-current and constant-voltage charging to 0.02 C and then stopping charging; step 4, aging the formed battery cell in a high-temperature environment of 85-90 DEG C, wherein the aging time is 20-24 hours; an