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 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, andthe control unit controlling the charging or discharging of the first battery cell according to the first calibrated voltage of the first battery cell.
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Accused Products
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.
4 Citations
14 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 the following steps:
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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. - 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 the following steps:
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when the control unit is charging or discharging the plurality of battery cells, the control unit obtaining a plurality of measured voltages of the battery cells respectively; the control unit computing an average voltage according to the plurality of measured voltages, and 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; the control unit 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, and the control unit controlling the charging or discharging of the plurality of battery cells according to the plurality of calibrated voltages of the plurality of battery cells. - View Dependent Claims (10, 11, 12, 13)
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14. A rechargeable battery set, comprising:
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a plurality of battery cells serially connected with one another; and a control unit electrically connected to the plurality of battery cells, the control unit; 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; 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; and controlling the charging or discharging of the plurality of battery cells according to the plurality of calibrated voltages of the plurality of battery cells.
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Specification