The batteries are cooled by removing heat from the bottom surface of the traction batteries. The device is mounted in a container supplied by the customer and connected to the cooling circuit and traction battery coolers. The cooling is based on the principle of dissipation of the heat loss generated in the traction battery with coolant. The technology needed to maintain the temperature and the required amount of coolant is built into one part of the traction battery container. The cooling technology power supply is from the 750V traction link voltage, and the control supply voltage is from the 24V vehicle network.  For diagnostic purposes, the system is equipped with an Ethernet interface for connection to the control system via a CAN line. Two methods are used to maintain the coolant temperature of traction batteries; the choice of method depends on the outdoor temperature. At low outdoor temperatures, the coolant is cooled by the outside air in a combined heat exchanger. The coolant temperature is regulated by outside air moved by continuous fan speed control. In other cases, the coolant temperature is maintained by regulating the heat transfer in the R134a refrigerant/coolant exchanger. The transmitted power is regulated by the compressor and the condenser fans.

 

Characteristics

• Control via CAN bus or Ethernet
• Compatible with TST (Tunning and Service Tool)
• Advanced diagnostic possibilities, event and operational data log
• Coolant temperature control system according to external conditions
• Integrated frequency converters
• Power supply from overhead line

Technical parameters

• Rated cooling capacity                                        2.5 kW
• Rated power supply voltage                              750 V DC
• Operating range of supply voltage                   500 V – 1000 V DC
• Rated control voltage                                          24V DC
• Antifreeze temperature                                      6 °C ± 1 °C
• Refrigerant in the compressor circuit             R134a
• Weight of cooling circuit components            190 kg
• Communication interface                                  CAN, Ethernet