Mitsubishi Denki Kabushiki Kaisha

Japan Storage Battery Co., Ltd.

Shinji Fujihara

Kiyoharu Anzai

Toshiaki Hayashi

Motoshi Kiribayashi

Hideji Nakamura

Makoto Wanezaki

In order to provide a battery charging state arithmetic operation device which can judge a charging state of a battery currently being used easily and in a short time, there are provided battery voltage calculation meanswith specified load for calculating a first and a second battery voltages when a battery current is at a specified load current value from a first I-V characteristic of the battery which is in a first state as a currently used state and is stored in first I-V characteristic storage meansand a second I-V characteristic which is in a second state where the amount of remaining energy is small and is stored in second I-V characteristic storage means, and SOC arithmetic operation meansfor calculating an SOC (charging state) of the battery in the first state by using the first and the second battery voltages calculated.

Growing community of inventors

Hyogo, Japan

Shinji Fujihara