Battery SOH estimation method and device, electronic equipment and storage medium

The invention discloses a battery SOH estimation method and device, electronic equipment and a storage medium, and the method carries out the data analysis of a voltage relaxation curve of a battery, and finds that the difference integral of the voltage relaxation curve of the battery and an SOH value have a function relation, so that the voltage relaxation curve of the battery is finely classified with the charge-discharge multiplying power as the classification basis, and the SOH estimation accuracy is improved. The method comprises the following steps: performing difference and integral operation on a limited voltage relaxation curve part to obtain a voltage relaxation curve difference integral, and then determining a function relationship between the voltage relaxation curve difference integral and an SOH value under different charge and discharge rates according to function fitting; and finally, estimating the SOH value of the to-be-tested battery based on the function relationship between the voltage re