Time-based vehicle battery balancing system and method
First Claim
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1. A method of balancing a vehicle battery including a plurality of cells, the method comprising:
- for each of the cells, determining, by a controller, a current voltage (vcurrent) of the cell, determining, by the controller, a discharge time (t) to reduce the current voltage (Vcurrent) to a target value (Vtarget), wherein the discharge time (t) is based on a resistance (R) of resistive circuitry associated with the cell, an equivalent capacitance (C) of the cell, the current voltage (Vcurrent), and the target voltage (Vtarget) according to the relationship t=RCln(Vtarget/Vcurrent), and discharging the cell for the discharge time (t) to balance the vehicle battery.
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Abstract
A power system for a vehicle may include at least one controller and a battery having a plurality of cells. The at least one controller may, for each of the cells, determine a voltage of the cell, determine a discharge time to reduce the voltage to a value approximately equal to a minimum of the determined voltages, and cause the cell to discharge for the discharge time to balance the battery.
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9 Claims
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1. A method of balancing a vehicle battery including a plurality of cells, the method comprising:
- for each of the cells, determining, by a controller, a current voltage (vcurrent) of the cell, determining, by the controller, a discharge time (t) to reduce the current voltage (Vcurrent) to a target value (Vtarget), wherein the discharge time (t) is based on a resistance (R) of resistive circuitry associated with the cell, an equivalent capacitance (C) of the cell, the current voltage (Vcurrent), and the target voltage (Vtarget) according to the relationship t=RCln(Vtarget/Vcurrent), and discharging the cell for the discharge time (t) to balance the vehicle battery.
- View Dependent Claims (2, 3, 4, 5)
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6. A power system for a vehicle comprising:
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a battery including a plurality of cells; and at least one controller configured to, for each of the cells, determine a voltage of the cell, determine a discharge time to reduce the voltage to a value approximately equal to a minimum of the determined voltages, and cause the cell to discharge for the discharge time to balance the battery. - View Dependent Claims (7, 8, 9)
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Specification