Rapid forming process of iron phosphate lithium battery

Abstract

The invention discloses a rapid forming process of an iron phosphate lithium battery. The rapid forming process comprises the following steps: vacuumizing after the battery is assembled, and injecting electrolyte by several times, and sealing the battery; putting the battery into a thermostat, standing for 8-12 hours at 45-50 DEGC, turning or rotating the battery in a standing process so as to putting each face of the battery downwards for a certain time; after the standing, carrying out ultrasonic treatment on the battery for 10-20 minutes; putting the battery on a cabinet, and carrying out low-current step type charging excitation and intermittent pulse discharge on the battery; after the charging is finished, carrying out deflation and one time of vacuumizing on the battery in a glove box, and carrying out sealing, ageing and capacity grading. According to the rapid forming process, firstly a diaphragm, an anode piece and a cathode piece of the battery are adequately infiltrated by virtue of the electrolyte, and then the battery is simultaneously subjected to high-current step type charging and intermittent pulse discharge, so that the time of the forming procedure is substantially shortened, the equipment loss is reduced, the performance of the formed battery is excellent, and the formed battery has no difference from a battery formed by virtue of a traditional forming process.

Description

technical field The invention belongs to the technical field of lithium ion batteries, and in particular relates to a rapid formation process of lithium iron phosphate batteries. Background technique The production process of lithium-ion batteries includes processes such as slurry mixing, coating, rolling, slicing, lamination (winding), assembly, liquid injection, and formation, among which formation is a very important link that determines the performance of lithium batteries. The impact of the formation process on the lithium battery mainly includes: 1. It affects the formation of the SEI film of the negative electrode sheet, its stability and compactness, and then affects the cycle performance of the lithium battery; 2. It affects the capacity of the lithium battery; 3. Incorrect formation The process will directly lead to lithium precipitation at the negative electrode of the lithium battery, forming "lithium dendrites", which will seriously threaten the safety performa...

AI Technical Summary

Problems solved by technology

Aiming at the problems of long time-consuming and low efficiency of traditional formation process, the present invention discloses a rapid formation process of lithium iron phosphate battery, which includes the following steps:

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