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Time-based vehicle battery balancing system and method

  • US 8,868,279 B2
  • Filed: 02/18/2014
  • Issued: 10/21/2014
  • Est. Priority Date: 07/28/2011
  • Status: Active Grant
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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