Patent ID: 7808208
Filing Date: 2010-10-05
Classification: H01M,Y02E

Abstract:
1. A battery equalizer for cars, comprising: a battery module comprising first and second batteries; and a battery equalizer mounted in the battery module to sustain charge voltages of the first and second batteries to be the same, wherein the battery equalizer comprises: a power converting unit for converting power so that the charge voltages are equally charged in the first and second batteries; and a noise preventing unit connected between the power converting unit and an external case to remove conductive noise of the power converting unit and surge noise of the external case, wherein the power converting unit comprises: a first switch connected to one end of the first battery through a first lead wire at a first contact point; a first resistor connected to a second lead wire between the first switch and the other end of the first battery or one end of the second battery; a second resistor connected to the first resistor in parallel in the second lead wire and connected to the other end of the second battery through a third lead wire; a first capacitor connected between the second resistor and the second and third lead wires in parallel; a second capacitor connected to the first and second resistors in parallel; and a second switch connected to the third lead wire at a second contact point and connected to the first capacitor.