The present invention relates to a power storage device that rapidly equalizes cell voltages through a simple configuration, a power storage controller, and a power storage control method. Said energy storage device is equipped with the following elements: several cells connected in parallel; several reactance components connected in series; a plurality of connection lines that connect the respective cells in parallel with the respective reactance components one by one; a plurality of switching components that individually connect or disconnect the respective connection lines; and an energy storage controller that controls the switching components so that energy is transferred between the cells.
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