A method for estimating battery capacity and battery management system

The present invention discloses a method of estimating battery, comprising the steps of: collecting data in the cell has different experimental conditions, all training samples and normalized training set and form a representative T; T training set and use a wide range of weights of all possibilities of search (c, g) training the SVM, and calculates the mean square error for each training sample, the mean square error two Jiaoyou select weights (C, G) corresponding to the minimum; use again weight training set T and the narrow search all possibilities around Jiaoyou weight (C, G) of (c, g) training the SVM, and calculates the mean square error for each training sample to select the minimum mean square error two corresponding optimal weighted (best C, best G), obtained using (best C, best G) optimized SVM estimates the SOC estimation function; input data of each cell acquired, to estimate the charge of each cell electrical state estimates. The method and system of the present invention, high accuracy, real-time monitoring, wide application, and is not complicated to implement.