High-temperature shelving method for improving cycle performance of lithium iron phosphate battery

The invention provides a high-temperature shelving method for improving the cycle performance of a lithium iron phosphate battery. The high-temperature shelving method is characterized by comprising the following steps of step 1) performing preliminary formatting, secondary encapsulation and capacity grading on the prepared lithium iron phosphate batteries, and selecting the batteries with qualified voltages for shelving for 4-48h in the dry environment with temperature being 40-75 DEG C; and step 2) performing normal-temperature shelving on the batteries treated by the step 1) for 48h, testing the voltages V1 and the internal resistances R1 of the batteries, continuously performing normal-temperature shelving for 72h, testing the voltages V2 and the internal resistances R2 of the batteries, and performing cycle tests on the batteries. According to the high-temperature shelving method provided by the invention, aiming to a specific lithium iron phosphate battery system, a matched high-temperature shelving pro