VOLTAGE CALIBRATION METHOD
First Claim
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 using the control unit to perform the following steps:
- obtaining a first measured voltage of the first battery cell and a second measured voltage of the second battery cell respectively;
computing an average voltage according to the first measured voltage and the second measured voltage;
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;
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.
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Abstract
In a rechargeable battery set, an average voltage is computed from average voltage drop produced by the sum of internal resistances of each battery cell. A calculated internal resistance of each battery cell is then computed from a measured voltage of each battery cell and the average voltage. Finally, the measured voltage of each battery cell is calibrated according to the calculated internal resistance and a calibrated voltage of each battery cell may be computed. In such way, the calibrated voltage of each battery cell is much closer to a real voltage of the battery cell, which provides a battery control unit more precise information when charging/discharging the battery cells.
5 Citations
13 Claims
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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 using the control unit to perform the following steps:
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obtaining a first measured voltage of the first battery cell and a second measured voltage of the second battery cell respectively; computing an average voltage according to the first measured voltage and the second measured voltage; 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; 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A voltage calibration method for a rechargeable battery set, wherein the rechargeable battery set includes a plurality of battery cells serially connected with one another and a control unit electrically connected to the plurality of battery cells, the voltage calibrating method comprising using the control unit to perform the following steps:
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obtaining a plurality of measured voltages of the battery cells respectively; computing an average voltage according to the plurality of measured voltages; computing a plurality of calculated internal resistances corresponding to the battery cells respectively according to the corresponding measured voltage, the average voltage, and a charging current running through the battery cells; obtaining a plurality of updated measured voltages of the battery cells and an updated charging current running through the battery cells; and computing a plurality of calibrated voltages corresponding to the battery cells respectively according to the corresponding updated measured voltage, the updated charging current, and the corresponding calculated internal resistance. - View Dependent Claims (10, 11, 12, 13)
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Specification