| CPC H02J 7/00712 (2020.01) [H02J 7/00 (2013.01); H02J 7/0048 (2020.01); H02J 7/005 (2020.01); H02J 7/0071 (2020.01); H02J 7/007182 (2020.01); H02J 7/007192 (2020.01)] | 8 Claims |
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1. A battery charge and discharge control device, comprising:
a voltage sensor for measuring a voltage of a battery; and
a controller for charging the battery with a constant current in a constant current mode, for converting from the constant current mode to a constant voltage mode when the voltage of the battery measured through the voltage sensor corresponds to an end-of-charge voltage, and for charging the battery with a constant voltage in the constant voltage mode,
wherein the end-of-charge voltage is set as a-first end-of-charge voltage and the first end-of-charge voltage is a voltage minus a negative electrode threshold potential from a full-charge voltage of the battery,
the negative electrode threshold potential is a potential value of a negative electrode where a negative electrode active material contained in the battery causes a phase change, and
the phase change of the negative electrode active material occurs when a negative electrode potential of the battery becomes lower than the negative electrode threshold potential during a charge process, and causes expansion of the negative electrode occurs due to a change in a structure of lithium ions binding to constituent elements of the negative electrode active material.
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