Cell balance device and battery system

摘要

Provided are a cell balance device with high cell balance performance and high cell balance speed and requiring no high voltage process, and a battery system including the cell balance devices. The cell balance device includes: three terminals to be connected to secondary batteries; one terminal to be connected to a voltage hold device; three switches provided between the three terminals and the one terminal; and a receiving terminal and a transmitting terminal for a synchronization signal. Alternatively, the cell balance device includes: four terminals to be connected to secondary batteries; two terminals to be connected to a voltage hold device; six switches provided between the four terminals and the two terminals; and a receiving terminal and a transmitting terminal for a synchronization signal. The battery system includes: a plurality of secondary batteries; a plurality of voltage hold devices; a plurality of cell balance devices; and a clock generation circuit.

主权项

1. A cell balance circuit for a battery system for adjusting a cell balance of a plurality of electric accumulators connected in series, the cell balance circuit comprising a plurality of cell balance devices, each device comprising:
a plurality of electric accumulator connection terminals comprising a first electric accumulator connection terminal, a second electric accumulator connection terminal, and a third electric accumulator connection terminal, each configured to connect to one of a node and two terminals of the plurality of electric accumulators; a voltage hold device connection terminal configured to connect to a designated one of a plurality of voltage hold devices, the number of voltage hold devices less than a total number of the electric accumulators; a plurality of switch circuits comprising a first switch circuit, a second switch circuit, and a third switch circuit, each connected to one of the plurality of electric accumulator connection terminals or the voltage hold device; a receiving terminal that receives a synchronization signal; a transmitting terminal that transmits the synchronization signal; and a control circuit that controls an ON/OFF state of the plurality of switch circuits based on the synchronization signal, wherein, when receiving the synchronization signal, the control circuit sequentially controls the ON/OFF state of the plurality of switch circuits, and wherein among the plurality of the cell balance devices, a first stage receives the synchronization signal, and second and subsequent stages each include the transmitting terminal connected to the receiving terminal of the cell balance device at a next stage, such that the plurality of cell balance device are synchronized.