Patent ID: 9490645
Filing Date: 2016-11-08
CPC Classification: H02J

Claim Text:
1. A battery balancing system, comprising a microcontroller, a plurality of battery management modules and a buffering battery pack, wherein the battery management modules each comprise a battery balancing circuit, the microcontroller connects with the plurality of battery management modules respectively via a first bus, and the plurality of battery management modules connect with the buffering battery pack respectively via a second bus, the battery balancing circuit comprises: a plurality of individual batteries connected in series to form a battery pack; a plurality of first switches and a plurality of second switches, wherein each of the individual batteries corresponds to one of the first switches paired with one of the second switches, and each of the first switches has a first terminal connected to a negative pole of the corresponding individual battery and each of the second switches has a first terminal connected to a positive pole of the corresponding individual battery; a first control element, having a first terminal adapted to receive a first control signal transmitted by the microcontroller so that the first control element is selectively turned on between a second terminal and a third terminal thereof under the control of the first control signal, and the second terminal of the first control element is connected with a second terminal of each of the first switches; a second control element, having a first terminal adapted to receive a second control signal transmitted by the microcontroller so that the second control element is selectively turned on between a second terminal and a third terminal thereof under the control of the second control signal; and a transformer, comprising a primary coil and a secondary coil, wherein a dotted terminal of the primary coil is connected with the second terminal of each of the second switches, an undotted terminal of the primary coil is connected with the third terminal of the first control element, a dotted terminal of the secondary coil is connected with the third terminal of the second control element, and an undotted terminal of the secondary coil and the second terminal of the second control element are adapted to receive energy from an external buffering battery pack for balancing energy of each of the individual batteries or transfer energy to the buffering battery pack.