Patent ID: 7196496
Filing Date: 2007-03-27
Classification: G01R,H01M,Y02E

Abstract:
1. A battery control circuit comprising: a battery voltage detecting section for detecting a voltage of a battery a resistor and a switching element connected in series being connected to said battery in parallel; and a battery controlling section for acquiring information relating to a change between the voltage of said battery detected by said battery voltage detecting section when said switching element is ON and the voltage of said battery detected by said battery voltage detecting section when said switching element is OFF by turning on said switching element to allow a current of said battery to flow through said resistor and by turning off said switching element; and a voltage recovery time measurement section for measuring a time period from a time when said switching element is turned off to a time when the voltage of the battery detected by said battery voltage detecting section recovers to a predetermined voltage value, wherein said battery controlling section determines a residual capacity of said battery based on the information relating to the change in the voltage of said battery, and wherein the information relating to the change is said time period measured by said voltage recovery time measurement section.