Patent ID: 7843170

Claim:
A Battery Backup Unit (BBU) Assembly, comprising: a Printed Circuit Board (PCB); a first protection circuit connected to the PCB, the first protection circuit being a Lithium-ion battery pack full protection Analog Front End (AFE) Integrated Circuit (IC); a second protection circuit connected to the PCB, the second protection circuit being a secondary overvoltage protection Integrated Circuit (IC), the secondary overvoltage protection IC incorporating an overvoltage detection circuit, the overvoltage detection circuit including a programmable delay circuit for overvoltage detection time; a battery pack connected to the PCB, the battery pack including a plurality of Lithium-ion (Li-ion) cells, the BBU Assembly being configured for electrically connecting the battery pack to at least one of: the first protection circuit and the second protection circuit, the secondary overvoltage protection IC being configured for comparing each of the plurality of cells of the battery pack to an internal reference voltage of the secondary overvoltage protection IC; a first plurality of capacitors connected to the PCB, each capacitor included in the first plurality of capacitors being connected between the battery pack and the first protection circuit; and a second plurality of capacitors connected to the PCB, each capacitor included in the second plurality of capacitors being connected between the battery pack and the second protection circuit, when a cell included in the plurality of cells of the battery pack reaches an overvoltage condition, the secondary overvoltage protection IC being configured for implementing a protection sequence, said protection sequence including charging a capacitor included in the second plurality of capacitors via a CD pin of the second protection circuit and, when a voltage of the CD pin reaches a pre-determined level, the second protection circuit is further configured for changing an OUT pin of the second protection circuit from a first level to a second level, wherein the battery pack is configured as one of a 2-cell series stack, a 3-cell series stack, and a 4-cell series stack.