Patent ID: 8575894
Filing Date: 2013-11-05
Classification: H02J

Abstract:
1. A method, comprising: detecting that a first battery pack system module comprising a plurality of battery cells has reached a first state of charge by the first battery pack system module; activating, by the first battery pack system module, a first charge switch in the first battery pack system module to physically disconnect and to prevent further charging of the first battery pack system module after detecting the first state of charge; discharging the plurality of battery cells after activating the first charge switch to balance the first battery pack system module with a second battery pack system module connected in series with the first battery pack system module; de-activating, by the first battery pack system module, the first charge switch after discharging the plurality of battery cells to a lower state of charge; and charging the first battery pack system module and charging the second battery pack system module after de-activating the first charge switch.