Method for estimating and revising state of charge (SOC) in battery management system of electric vehicle

The invention belongs to the field of power battery management of electric vehicles and in particular relates to a method for estimating and revising the state of charge (SOC) in a battery management system of an electric vehicle. The method mainly comprises the following steps of: firstly, calculating the current SOC of a battery; and secondly, revising the SOC for influence of battery temperature, battery ageing and a current integration accumulated error on the SOC, wherein for the influence of the battery temperature and the battery ageing on the SOC, the SOC of the battery is revised by calculating revising factors of the battery temperature and the battery ageing and using the revising factors, and for the influence of the current integration accumulated error on the SOC, revising of the SOC is determined by judging discharging current and duration time. The method has the advantages that: by revising the SOC for the influence of the battery temperature, the battery ageing and the current integration accumulated error on the SOC, influencing factors of the error can be quite conveniently eliminated, and the revising accuracy of the SOC is improved.