Patent ID: 6057688
Filing Date: 2000-05-02
Classification: B60L,G01R,Y02T

Abstract:
A residual capacity detecting apparatus for a battery comprising:voltage measuring means for measuring an actual discharge voltage of a battery which is chargeable and dischargeable repetitively;current measuring means for measuring an actual discharge current of said battery;discharge amount calculating means for obtaining a calculative discharge amount of said battery based on said actual discharge current measured by said current measuring means;discharge voltage determining means for determining a calculative discharge voltage corresponding to said calculative discharge amount obtained by said discharge amount calculating means on an initial discharge characteristic curve of said battery, said initial discharge characteristic curve representing an initial relationship between the discharge voltage and the discharge amount of said battery; anddischarge characteristic estimating means for parallel shifting said initial discharge characteristic curve so that said calculative discharge voltage determined by said discharge voltage determining means coincides with said actual discharge voltage measured by said voltage measuring means, thereby obtaining an estimated discharge characteristic curve reflecting said actual discharge voltage and said calculative discharge amount.