BATTERY HEATER CONTROL

id304000200800


Outline

•  The high voltage battery has significantly reduced charging and discharging performance in extremely cold environments which affects driving performance. The PCM warms the high voltage battery to the appropriate temperature by controlling the battery heater at extremely low temperatures. As a result, the charge/discharge performance of the high voltage battery at extremely low temperatures is assured.
•  The operation status of the high voltage battery heater and the necessity of charging can be checked using the Connected Service. (When Connected Service use contract is valid)

Block Diagram

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Operation

•  When the BECM detects that the high voltage battery temperature is the specified value or less, it sends a battery heater drive request signal to the PCM via CAN communication.
•  Under any of the following conditions after receiving the battery heater drive request signal, the PCM sends a battery heater operation request signal to the BECM via CAN communication.
―  High voltage battery state of charge (SOC) is specified value or more
―  Charging connector is connected
•  When the BECM receives the battery heater operation request signal from the PCM, it operates the battery heater relay and the battery heater.
•  The BECM turns off the battery heater when the high voltage battery module temperature increases to the specified value.
•  The BECM determines if the battery heater needs to be operated periodically.

Inhibition conditions

•  When the BECM detects any of the following conditions, it inhibits battery heater system control.
―  Battery heater operation is turned off by operating center display
―  Main power is not switched OFF
―  Vehicle is parked for long period (5 days or more) with charging connector connected
―  High voltage battery state of charge (SOC) is specified value or less


Operation condition display function

•  When the main power is switched ON (READY off or on) after the battery heater control is operated, the instrument cluster displays the content related to the battery heater operation on the multi-information display.
•  When the PCM detects that battery heater control is stopped during battery heater control, it sends information related to the battery heater operation to the user's Smartphone by the Connected Service via the Mazda server. (When Connected Service is enabled)