Techno Core International Co., Ltd.

The New Industry Research Organization

Hiromi Takaoka

Osamu Nakamura

Yutaka Iuchi

Yasuo Osabe

Takamichi Fujiwara

Shigetomo Matsui

Taneo Nishino

An equipment and method for charging a secondary battery are provided to quickly and surely charge a secondary battery (secondary batteries) while preventing the secondary battery (batteries) from overcharging or insufficient charging. Special charging voltage Eis applied to a secondary battery for a predetermined time, and then the applied voltage is switched to equilibrium voltage Efor establishing equilibrium cell potential of the secondary battery in its fully charged condition, wherein the special charging value Eis larger than the equilibrium value E. Electric current i is detected while application of the equilibrium voltage E. If the detected electric current i is larger than standard electric current J for finishing charging, the above detection and charging are repeated; otherwise, charge of the secondary batteryis halted.

Secondary cell charger and charging method

An object of the present invention is to provide a charging equipment for a secondary battery that can charge any secondary battery, regardless of its kind, size and the like, until its charging rate comes to approximately 100%. The charging equipment comprises: a voltage increment device for incrementing a check voltage by a preset pitch of voltage from a lowest check voltage lower than a rated equilibrium voltage at full charge; a switch for switching applied voltage to the secondary battery to the special charging voltage or the check voltage supplied; a first judging means for judging whether an electric current detected by a current detection part is smaller than or as large as a preset standard electric current for judging; and a second judging means for judging whether the time required for the period from the last affirmative judgment to the present affirmative judgment is larger than two times as large as the time required for the period from the before-last affirmative judgment to the last affirmative judgment.

Charging equipment for secondary battery

Growing community of inventors

Hyogo, Japan

Hiromi Takaoka