Patent ID: 6388426
Filing Date: 2002-05-14
Classification: G01R,H02J

Abstract:
A battery power source device comprising:a rechargeable battery having a discharge circuit; and a discharge control device that controls discharge of said rechargeable battery, wherein said discharge control device measures the voltage and discharge current of said rechargeable battery a prescribed number of times at prescribed time intervals, detects a battery voltage value and a discharge current value for each of said prescribed number of measurement operations from running averages for said measurement operations, detects the battery temperature of said rechargeable battery, and shuts off the discharge circuit of said rechargeable battery, when said battery voltage value, discharge current value and battery temperature satisfy any one of the following conditions: (1) when said battery voltage value at most equal to a predetermined undercut voltage value is detected consecutively for at least a prescribed number of measurement operations; (2) when said discharge current value at least equal to a predetermined excessive current value is detected consecutively for at least a prescribed number of measurement operations; and (3) when said battery temperature is at least equal to a predetermined temperature.