Kabushiki Kaisha Toshiba

Hirotada Tahara

Hiroki Inagaki

Haruchika Ishii

Masataka Shikota

Toshihide Arikawa

Yuichi Kikuma

Yoshinao Tatebayashi

Hirotaka Hayashida

Kengo Kurata

Yoshiaki Asami

Kazuya Kuriyama

Teruo Hiruma

Hidetoshi Watanabe

Kazuko Takanezawa

Kazuko Newton

According to an embodiment, there is provided a battery system. The battery system includes a first battery and a second battery connected in parallel with the first battery. The first battery includes a lead storage battery. The second battery includes a nonaqueous electrolyte battery. The nonaqueous electrolyte battery includes a positive electrode and a negative electrode. The negative electrode includes a negative-electrode-mixture layer, and the negative-electrode-mixture layer contains lithium titanate. The positive electrode contains a positive electrode active material LiMnM(a)O. A ratio of a battery capacity of the second battery to a battery capacity of the first battery is in a range of 1/133 to 1/2.

Battery system

According to one embodiment, there is provided a nonaqueous electrolyte battery. The negative electrode of the battery includes a negative electrode active material which can absorb and release lithium ions at a negative electrode potential of 0.4 V (V.S. Li/Li) or more. The battery satisfying the following equations (I) and (II):1&#x2266;2/1&#x2003;&#x2003;(I)0.5&#x2266;&#x2003;&#x2003;(II)

Nonaqueous electrolyte battery, battery pack and vehicle

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Kashiwazaki, Japan

Hirotada Tahara