US 7,514,905 B2
Battery management system
Youhei Kawahara, Hitachi (Japan); Akihiko Emori, Hitachi (Japan); Shuko Yamauchi, Hitachi (Japan); Hirotaka Takahashi, Hitachinaka (Japan); Masami Shida, Mito (Japan); and Yoshinori Aoshima, Tsukubamirai (Japan)
Assigned to Hitachi Vehicle Energy, Ltd., Hitachinaka-shi (Japan)
Filed on Dec. 14, 2006, as Appl. No. 11/638,528.
Claims priority of application No. 2005-362733 (JP), filed on Dec. 16, 2005.
Prior Publication US 2007/0145954 A1, Jun. 28, 2007
Int. Cl. H01M 10/46 (2006.01)
U.S. Cl. 320—150 6 Claims
OG exemplary drawing
 
5. A battery management system comprising:
a plurality of temperature measuring means for measuring temperature values of a battery capable of charging and discharging electricity;
voltage and current measuring means for measuring a voltage and a current of said battery and voltages of a plurality of single cells constituting said battery;
calculation means for determining a maximum temperature and a minimum temperature of said battery from the temperature values measured by said temperature measuring means, calculating respective values of maximum available charge and discharge powers or maximum available charge and discharge currents of said battery corresponding to the maximum temperature and the minimum temperature based on the voltage and the current of said battery measured by said voltage and current measuring means, determining a maximum voltage and a minimum voltage among the single cells in said battery from the voltage values of the single cells in said battery measured by said voltage and current measuring means, and calculating respective values of maximum available charge and discharge powers or maximum available charge and discharge currents of said battery corresponding to the maximum voltage and the minimum voltage based on the voltage and the current of said battery measured by said voltage and current measuring means; and
selection means for selecting smallest maximum available charge and discharge powers or smallest maximum available charge and discharge currents from the respective values of the maximum available charge and discharge powers or the maximum available charge and discharge currents of said battery corresponding to the maximum temperature, the minimum temperature, the maximum voltage and the minimum voltage, which are calculated by said calculation means.