Battery status of health judgment method and device

Abstract

The invention discloses a battery status of health judgment method and device. The method includes the following steps that: the electrochemical impedance of a new battery at one or a plurality of characteristic frequency points and characteristic frequency sites are acquired, wherein the characteristic frequency points can reflect the internal state of the battery; an old battery is excited according to characteristic frequencies corresponding to the characteristic frequency points of the new battery, so that the current electrochemical impedance of the old battery can be determined; and theelectrochemical imaginary part impedance of the new battery and the old battery at the characteristic frequency sites are compared with each other, so that the aging degree of the old battery can be judged. According to the prior art, the aging condition of an electrochemical reaction inside a battery can be hardly embodied, and the aging conditions of the external characteristics of the battery are just embodied, with the method and device of the invention adopted, high test difficulty, high cost, short service lives and other defects in the prior art can be eliminated. The battery status ofhealth judgment method and device have the advantages of low test difficulty, low cost and long service life.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a method and device for judging the health state of a battery, in particular to a method for judging the health state of a lithium-ion battery / battery pack and a device corresponding to the method, and more specifically to a A method for judging the state of health of a lithium-ion battery / battery pack by using the characteristic frequency of an electrochemical process, and a device corresponding to the method. Background technique [0002] As the number and frequency of use of electric vehicles continue to increase, how to non-destructively and quickly diagnose the health status of on-board batteries is of great significance to both car owners and car companies. [0003] The internal mass transfer process and electrochemical reaction are very complicated when the battery is working. A good battery health diagnosis method should reflect the changes inside the batter...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a method and device for judging the state of battery health in view of the above defects, so as to solve the problem of difficulty in testing the state of battery health in the prior art and achieve the effect of reducing the difficulty of testing

Images