LITHIUM ION SECONDARY BATTERY, BATTERY PACK, HYBRID AUTOMOBILE, BATTERY PACK SYSTEM, AND CHARGE-DISCHARGE CONTROL METHOD

摘要

PROBLEM TO BE SOLVED: To provide a lithium-ion secondary battery in which output variations are small, and stable output characteristics (IV characteristics) can be obtained, a battery pack using this, a hybrid automobile to mount this, a battery pack system in which the output variations are small and the stable output characteristics ( IV characteristics) can be obtained, and a charge-discharge control method.

SOLUTION: The lithium ion secondary battery 100 has a property of securing a flat charge-discharge capacity range FC in which fluctuation of terminal voltage is 0.2 V or lower in both cases where the lithium ion secondary battery 100 is charged and discharged with electric current having a current value of 1 C over a capacity range of 50% or more of the electric capacity range having a theoretical electric capacity as an upper limit.

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