Low-temperature charging method of lithium ion battery

Abstract

The invention relates to a low-temperature charging method of a lithium ion battery. The method is applied to the low-temperature charging process of the lithium battery. According to the method, thereal-time temperature of the lithium battery is obtained, and the switch of a battery heating device is controlled by the comparison result between the real-time temperature and a preset temperature threshold value in a battery management system so as to keep the lithium battery in the safe temperature range, and the lithium battery is stably charged at a specific safe charging rate; then an ultrasonic detection technology is used for detecting whether gas exists in the lithium battery or not, and the charging is directly continued or the charging process is performed after the charging current is lowered according to the detection result; and the steps that the ultrasonic detection is carried and the charging is directly continued or the charging process is performed after the charging current is lowered are repeatedly executed so as to realize safe charging in the whole process of the lithium battery in different stages. The method skillfully introduces a charging control method combining the ultrasonic detection technology and the battery heating technology, so that the problems that the existing lithium battery is large in low-temperature charging energy consumption, long in time and easy to separate out lithium are effectively solved, and the charging efficiency is also improved.

Description

technical field [0001] The invention relates to the technical field of battery charging management, in particular to a low-temperature charging method for a lithium-ion battery. Background technique [0002] Since the 21st century, the energy crisis and environmental pollution have occurred frequently, and the traditional automobile industry has been severely challenged. Electric vehicles have been developed and have gradually become an important hot spot in the automobile industry due to their clean and efficient advantages. As the core component of electric vehicles, the performance of power batteries is particularly important. At present, lithium-ion batteries are mostly used in vehicles, so the performance optimization of lithium-ion batteries has gradually become an important research topic for scholars at home and abroad. [0003] Lithium-ion battery (referred to as lithium battery) is a kind of secondary battery, which has the advantages of large specific energy, high...

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a low-temperature charging method for lithium-ion batteries aiming at the problems of long charging time, high energy consumption, and easy lithium analysis in the general method of low-temperature charging at present. In the process of charging under the magnification rate, the internal exhaust of the lithium battery is detected, so as to judge whether the lithium battery is decomposing lithium, detect the lithium decomposing situation in time, and adjust the charging current in time, so that the lithium battery can realize the safe charging of the whole composition stage, effectively solving the problem of lithium battery The low-temperature charging is easy to decompose lithium, and the charging efficiency is improved, which is simple and safe.

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