Patent ID: 7129707
Filing Date: 2006-10-31
Classification: H01M,Y02E

Abstract:
1. An apparatus for judging a state of an assembled battery composed of a plurality of battery blocks connected in series, said apparatus comprising: voltage measuring means for measuring respective voltages of said plural battery blocks at different times; current measuring means for measuring currents flowing through said assembled battery; and state judgment means for judging the state of said assembled battery by means of the respective voltages of said plural battery blocks, which are measured by said voltage measuring means at the different times, and respective currents measured by said current measuring means correspondingly to the respective voltages at the same time as the respective voltages are measured, wherein said state judgment means is means for judging existence of an overdischarge of said assembled battery on the basis of the respective voltages measured by said voltage measuring means, the respective currents measured by said current measuring means corresponding to the respective voltages, and internal resistance of said assembled battery corresponding to temperature of said assembled battery.