SOH (State Of Health) value determining method and device for battery system

The invention provides an SOH (State Of Health) value determining method and device for a battery system. The method comprises the following steps that: utilizing the recession data of a battery system to obtain a corresponding SOH calculation value; utilizing an SOH correction quantity obtained in a correction process to correct the SOH calculation value to obtain an SOH update value; and finally, on the basis of the SOH update value and an SOH historical value stored in the battery system, determining the final SOH output value of the battery system. By use of the method, after the recessiondata of the battery system is used for obtaining the SOH calculation value, the SOH correction quantity is also used for correcting the SOH calculation value, and the accuracy of the SOH value is improved. 本发明提供了电池系统的SOH值确定方法及装置，该方法利用电池系统的衰退数据得到对应的SOH计算值，并利用校正过程得到的SOH修正量对SOH计算值进行修正得到SOH更新值。最后，依据SOH更新值和电池系统中存储的SOH历史值确定出该电池系统最终的SOH输出值。该方法利用电池系统的衰退数据得到SOH计算值后，还利用SOH修正量对该SOH计算值进行修正，提高了SOH值的精确度。