Patent ID: 6246216
Filing Date: 2001-06-12
Classification: G01R,H02J

Abstract:
A battery charge control device for controlling to charge a battery electrically connected with a load, the battery charge control device being constructed so as to charge the battery while lowering a charging current brought from the load in a step manner when the battery's residual capacity drops during the load's operation, the capacity measuring device comprising:a memory unit for collecting and storing a sequential data of terminal voltage of the battery;a temporary-gassing detecting unit connected to the memory unit, the temporary-gassing detecting unit generating a signal representing that the battery is in course of reaching its gassing state when the so-collected terminal voltage of the battery exceeds a threshold value during charging the battery with a charging current;a voltage regulation calculating unit connected to the temporary gassing detecting unit so as to input the signal therefrom, the voltage regulation calculating unit calculating a changing rate of terminal voltage of the battery while the battery is in course of reaching the gassing state; anda gassing detecting unit connected to the voltage regulation calculating unit, for judging that the battery has just reached the gassing state when the calculated changing rate exceeds a preset decision value for the changing rate.