Kabushiki Kaisha Toyota Chuo Kenkyusho

Naoki Baba

Toshiyuki Tanaka

Takafumi Yamauchi

Yasuki Hirota

Chikaaki Okuda

Kiyoshi Yamazaki

Norihiko Setoyama

Haruo Imagawa

Seiji Yamamoto

Takao Inoue

Shogo Sayama

Seiichi Kunitomi

Kazuto Ogasawara

Masatoshi Sakai

Yoshihiko Itoh

An electric power storage systemof the present invention includes a lithium secondary battery; a detection device to detect the temperature of the lithium secondary battery; and a control device to decrease a remaining capacity of the lithium secondary battery based on an increase of the detected temperature and a temperature Tbx of the lithium secondary battery. When a self-heating rate of the lithium secondary battery at a temperature T (K) and a remaining capacity x (%) is represented by Hs(x, T) (K/min), and a heat dissipation rate at a temperature T (K) of the lithium secondary battery is represented by Hd(T) (K/min), the temperature Tbx is a temperature at which Hs(x,Tbx)&#x3e;Hd(Tbx) holds. That is, this temperature Tbx is a temperature at which the heat generating rate is higher than the heat dissipation rate and at which the battery temperature T starts to increase.

Electric power storage system

Growing community of inventors

Nagakute, Japan

Naoki Baba