METHOD AND DEVICE FOR ESTIMATING SERVICE CAPACITY AND STATE OF HEALTH OF CELL AND BATTERY SYSTEM

摘要

A method and a device for estimating a service capacity and a state of health of a minimum battery cell and a battery system is provided. The method for estimating the state of health includes: when a battery system is power-on, determining an initial state of charge of a minimum battery cell in the battery system being charged; after the battery system is fully charged, determining a state of charge of the minimum battery cell at the end of charging, and calculating to obtain a charging capacity of the minimum battery cell; and performing a computation to obtain a service capacity of the minimum battery cell, a service capacity of the battery system and a state of health of the battery system. The method can effectively solve a problem of inaccurate estimations of a service capacity of a minimum battery cell of a vehicle battery, a service capacity of a battery system and a state of health of the battery system.