Abstract:

Based on analysis of residual capacity estimation methods for lead-acid batteries, this paper realized a capacity fuzzy estimation method using electromotive force (EMF) and internal resistance of lead-acid batteries. An empirical equation is obtained from measured EMF and internal resistance, which can be used as feedback of the fuzzy model. It improves performance and stability of the fuzzy controller. Simulated results show validity of the method. 

Key words: lead-acid battery; residual capacity; fuzzy control; state of charge (SOC)