| CPC H02J 7/00714 (2020.01) [H02J 7/0016 (2013.01); H02J 7/0047 (2013.01); H02J 7/345 (2013.01)] | 20 Claims |
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1. A power supply device provided with a plurality of power storage units each of which has a battery, a first terminal, and a second terminal, the power supply device comprising:
a battery pack including the plurality of power storage units connected in series each of which has a first path and a second path, the first path connecting a positive side of the battery and the first terminal, the second path connecting a negative side of the battery, the second terminal, and the first terminal;
a capacitor connected in parallel to the battery pack;
a charging circuit to charge the battery pack;
a current adjusting circuit to adjust a current flowing from the capacitor to the positive side of the battery pack;
an information detector to output state detection information containing a battery voltage of the battery and a capacitor voltage of the capacitor; and
a battery pack control circuit to control opening/closing of the first path and opening/closing of the second path in the power storage unit, and the current adjusting circuit based on the state detection information, wherein
the current adjusting circuit includes a load through which a current flows and a switching device to control a flow and a cutoff of the current to the load,
the battery pack control circuit, when the battery having reached an upper limit voltage is detected based on the state detection information during charging of the battery pack, after closing the first path in the power storage unit having a bypass target battery that is the battery having reached the upper limit voltage and controlling the switching device in the current adjusting circuit to cause a current to flow through the load, opens the second path in the power storage unit including the bypass target battery, and then controls the switching device to cut off the current flow to the load.
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