Vehicle Energy Japan Inc.

Hitachi Chemical Company, Ltd.

Masanari Oda

Shigeki Makino

Wataru Sato

Hirofumi Takahashi

Hitoshi Nishimori

Shuichi Suzuki

Ryohhei Nakao

Takenori Ishizu

Takahiro Yamaki

Provided is a battery pack including: a first battery group in which a plurality of storage batteries having a battery can side surface and a battery can bottom surface linked to the battery can side surface are laminated so that the battery can side surfaces face each other; a second battery group in which a plurality of storage batteries having a battery can side surface and a battery can bottom surface linked to the battery can side surface are laminated so that the battery can side surfaces are face each other; and a case housing the first battery group and the second battery group, wherein the facing surfaces of the first battery group and the second battery group are directly or indirectly thermally connected to each other.

Battery pack

The life of a secondary battery has not been able to be prolonged due to deterioration of the secondary battery. In one step, whether a difference between an average value of a negative electrode capacity deviations calculated in a different step and a negative electrode capacity deviation calculated in another step is larger than a predetermined value is determined. In a case where the average value of the measured negative electrode capacity deviations is larger than the ideal negative electrode capacity deviation, and deterioration of the negative electrode capacity deviation is proceeding, a secondary battery is controlled to operate at a high voltage in a further step. With the control, the deterioration of the negative electrode capacity deviation is suppressed and the life of the secondary battery is prolonged.

Secondary battery control device

Provided are a cathode active material with excellent high-temperature life that suppresses the elution of metal elements from the cathode active metal and the generation of different phase therein and exhibits a high potential, as well as a high-voltage lithium ion battery that achieves excellent high-temperature life by applying such a cathode active material. The cathode active material for a lithium ion battery is represented by a compositional formula LiNiMnMOF(where M is one or more elements selected from the group consisting of Ti, Ge, Mg, Co, Fe, Cu, and Al, and a, x, y, z, and &#x3b4; satisfy the following formulas: 1&#x2266;a&#x3c;1.08, 0.4&#x2266;x&#x3c;0.5, 0&#x3c;z&#x2266;0.3, a+x+y+z=3, and 0&#x3c;&#x3b4;&#x2266;0.2).

Cathode active material for lithium ion battery, cathode material for lithium ion battery, and lithium ion battery

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Tokyo, Japan

Masanari Oda