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Traction battery cooling system

  • US 9,827,846 B2
  • Filed: 06/10/2015
  • Issued: 11/28/2017
  • Est. Priority Date: 06/10/2015
  • Status: Active Grant
First Claim
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1. A vehicle comprising:

  • a traction battery;

    a grill shutter assembly including an opening and shutters movable to alter an effective cross-sectional area of the opening;

    a battery thermal management system includinga refrigerant subsystem having a compressor, a condenser, and a chiller,a coolant subsystem having a pump, a radiator, and conduit arranged to carry coolant between the traction battery and the radiator to cool the traction battery, the coolant subsystem further having a radiator-bypass conduit in fluid communication with the chiller and a valve configured to selectively route coolant to the radiator or the chiller depending upon a position of the valve, anda fan adjacent to the radiator and the condenser and configured to circulate air over the radiator and the condenser; and

    a controller configured to,in response to a temperature of the traction battery being greater than a first threshold and an ambient air temperature being less than the temperature of the traction battery, (i) actuate the valve to route coolant to the radiator and (ii) operate the shutters to change the effective cross-sectional area of the opening to increase or decrease air flow over the radiator based on a temperature of the coolant, the ambient air temperature, and a speed of the vehicle,in response to the temperature of the traction battery being greater than the first threshold and less than a second threshold, and the ambient air temperature being less than the temperature of the traction battery, (i) actuate the valve to route coolant to the radiator, (ii) operate the shutters to change the effective cross-sectional area of the opening to increase or decrease air flow over the radiator based on a temperature of the coolant, the ambient air temperature, and a speed of the vehicle, and (iii) run the fan at a duty cycle that is based on a temperature of the coolant and the ambient air temperature, andin response to the temperature of the traction battery being above the second threshold or the ambient air temperature being above the temperature of the traction battery, actuate the valve to route coolant to the chiller.

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