Patent ID: 9219381
Filing Date: 2015-12-22
Classification: H01M,H02J,Y02E

Abstract:
1. A charging system comprising: a power generating unit generating electric power using natural energy; a control unit controlling an operation of the charging system; a plurality of secondary battery packs being charged with the electric power generated by the power generating unit; and a control power source selecting the secondary battery pack as a power source to be used for the operation control of the control unit, wherein the control power source selecting unit selects the secondary battery pack as the power source to be used for the operation control on the basis of the state of charges of the plurality of secondary battery packs, the control power source selecting unit selects the secondary battery pack of which the state of charge is the lowest out of the secondary battery packs of which the state of charge is equal to or more than a lower threshold value of the state of charge as the secondary battery pack of the power source to be used for the operation control, the control unit determines whether a predetermined time interval passes after the secondary battery pack is selected, when it is determined that the predetermined time interval has passed, the control power source selecting unit selects again the secondary battery pack, in the selection after the predetermined time interval has passed, among the plurality of secondary battery packs, of which the state of charge is the lowest out of the secondary battery packs of which the state of charge is equal to or more than a lower threshold value of the state of charge as the secondary battery pack of the power source to be used for the operation control, and when a new secondary battery pack is selected in the selection, the newly selected secondary battery pack is connected to the control unit.