Patent ID: 9099877
Filing Date: 2015-08-04
Classification: H01M,H02J,Y02E

Abstract:
1. A battery pack for powering a device, comprising: a rechargeable cell having a positive and a negative terminal; a battery pack connector for connecting the battery pack to a charger or a device to be powered by the battery pack; a main bus connecting the positive terminal of the rechargeable cell with a positive connector of the battery pack connector and also connecting the negative terminal of the rechargeable cell with a negative connector of the battery pack connector; and a battery management system in electrical communication with the rechargeable cell, including: a second rechargeable cell connected in series with the first rechargeable cell; and a monitoring circuit, in electrical communication with the processor, the monitoring circuit monitoring the voltage of the first and second rechargeable cells and providing a signal for each rechargeable cell to the processor, the signal representative of a level of voltage measured across a negative and positive terminal of each cell, the monitoring circuit including a first switch connecting the first rechargeable cell to a first bleeder circuit, the first switch responsive to an overvoltage signal from the processor to close the first switch to prevent overcharging of the first rechargeable cell, the monitoring circuit also including a second switch connecting the second rechargeable cell to a second bleeder circuit, the second switch responsive to an overvoltage signal from the processor to close the second switch to prevent overcharging of the second rechargeable cell.