Patent ID: 6294894
Filing Date: 2001-09-25
Classification: G01R

Abstract:
A rechargeable battery arrangement in which total service capacity for discharge from full charging to a final discharge voltage varies according to discharge conditions for discharging charged electric charge, comprising:an integration means which integrates quantity of electric charge discharged between a point of start of discharge after charging and the present;a data storage means for storing a plurality of total service capacities for discharge at a plurality of values of discharge current, respectively in unique association with a specific one of the total service capacities for discharge at a specific one of the values of discharge current;a current detection means for detecting a present value of discharge current; anda calculation means which obtains, from data obtained by the data storage means on the basis of the present value of discharge current detected by the current detection means, a total service capacity corresponding to or closest to the present value of discharge current and calculates, from the total service capacity and an integrated value obtained by the integration means, a residual capacity of electric charge for discharge.