Patent ID: 9188649
Filing Date: 2015-11-17
Classification: G01R

Abstract:
1. A voltage calibration method for a rechargeable battery set, wherein the rechargeable battery set includes a first battery cell and a second battery cell serially connected with each other and a control unit electrically connected to the first battery cell and the second battery cell, the voltage calibrating method comprising the following steps: when the control unit is charging or discharging the first battery cell and the second battery cell, the control unit obtaining a first measured voltage of the first battery cell and a second measured voltage of the second battery cell respectively; the control unit computing an average voltage according to the first measured voltage and the second measured voltage, and computing a first calculated internal resistance of the first battery cell according to the first measured voltage, the average voltage, and a charging current running through the first battery cell; the control unit obtaining a first updated measured voltage of the first battery cell and an updated charging current running through the first battery cell, and computing a first calibrated voltage of the first battery cell according to the first updated measured voltage, the updated charging current, and the first calculated internal resistance, and the control unit controlling the charging or discharging of the first battery cell according to the first calibrated voltage of the first battery cell.