Method and device for adjusting soh coefficient of power battery

Abstract

The invention discloses a SOH (State of Health) coefficient regulation method and device for a power battery. The method comprises the following steps: carrying out discharging on a power battery to be regulated; acquiring discharge data of the power battery in the discharging process; according to the discharge data, judging whether to regulate a current SOH coefficient of the power battery; when judging that the current SOH coefficient needs to be regulated, acquiring a regulation strategy; in the next charging process, regulating the current SOH coefficient by using the regulation strategy so as to obtain a target SOH coefficient of the power battery. According to the method, by judging whether to regulate the current SOH coefficient according to the discharge data in the discharging process, acquiring the regulation strategy if the current SOH coefficient needs to be regulated and regulating the SOH coefficient according to the acquired regulation strategy in the next charging process, real-time judgment and regulation on the SOH coefficient in the using process of the power battery are implemented, and accuracy of the estimated SOH coefficient is improved.

Description

technical field [0001] The invention relates to the field of vehicle engineering, in particular to a method and device for adjusting the SOH coefficient of a power battery. Background technique [0002] As the service life of the power battery increases, the capacity and power performance of the power battery will show a declining trend. In the case of power battery life attenuation, if the State of Health (SOH) coefficient cannot be accurately estimated, it will inevitably affect the evaluation of the capacity and power performance of the power battery, thereby reducing the performance of the battery and the efficiency of use. Reliability, even overload use, dangerous accidents may occur. [0003] At present, there are mainly two methods for estimating the SOH coefficient. One is to estimate the SOH coefficient by estimating the internal resistance of the battery; the other is to estimate the SOH coefficient by counting the cumulative charge capacity and cumulative dischar...

AI Technical Summary

Problems solved by technology

[0006] For this reason, the first purpose of the present invention is to propose a method for adjusting the SOH coefficient of the power battery, by judging whether to adjust the current SOH coefficient according to the discharge data obtained during the discharge process, and if adjustment is required, then obtain the adjustment strategy , in the next charging process, adjust the current SOH coefficient according to the obtained adjustment strategy, realize the real-time judgment and adjustment of the SOH coefficient during the use of the power battery, and solve the existing methods for estimating the SOH coefficient with large errors and poor real-time performance The problem

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