Patent ID: 6114839
Filing Date: 2000-09-05
Classification: H01M,H02J,Y02E

Abstract:
A battery charging apparatus comprising:charging current generation means for generating a charging current from an ac supply;first terminal means for supplying said charging current to a secondary battery to be charged included in a battery package, said battery package further including a thermal sensitive element adjacent to said secondary battery generating a temperature detection signal indicative of a temperature of said battery;second terminal means for receiving said temperature detection signal;sampling means for periodically sampling a value of said temperature detection signal every predetermined interval;memory means responsive to said sampling means for storing said value;operation means for obtaining a temperature decrease value from said value and said value from said memory means;error judgment means for judging an error condition when said difference is higher than a predetermined value; andcontrol means for controlling said charging current generation means to stop generating said charging current when said temperature decrease value is higher than a predetermined value.