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battery pack for electric vehiclesWith the booming of electric vehicles (EV) and hybrid electric vehicles (HEV), we see fast increasing demand for battery heaters.  Being a TS16949 certified company, Sinomas has been supplying heating elements to the automotive industry for a few years.

Study shows that the optimal discharging temperature of lithium batteries used for electric vehicles is 30°C - 35°C. Low working temperature will greatly reduce the discharging current and the overall energy available. It is even harmful and potentially risky to charge the battery under -10°C. In brief, it is necessary to heat up the power battery to achieve the best performance and extended lifetime.

Our silicone rubber heaters provide reliable heat source for EV battery pack and eliminate the negative impact of low temperature on the lithium-ion batteries. Different thermal profiles can be designed to be installed inside the wall and bottom of the battery box. It is also possible to insert heating plates in between the battery packs. In this case, several slots may have to be cut to allow for good thermal contact and air ventilation.

battery pack heaterbattery heater with quick connectorsbattery heater for the bottom

Product features:

  • The heating elements adopt nickel alloy foil that patterned by etching process. Fast heating, high efficiency and long working life can be achieved. 
  • The double insulation of moisture proof silicone rubber and alkali free glass fiber makes the insulation more reliable.
  • The auxiliary radiation of aluminum plate improves the thermal efficiency of the heater plate and prolongs their working life. 
  • Built-in temperature sensors, thermostats and quick connectors make it convenient to integrate with BMS system.

Operation Principle

The operation of the battery heaters is controlled by battery management system (BMS) of the electric vehicle via a relay. One temperature input of the BMS is taken from the temperature sensor (NTC) integrated in the battery heaters. For example, when the ambient temperature is lower than 3°C, the heaters cut in. When the temperature of the heaters reach 17 °C or the ambient temperature reaches 8°C, the heaters will cut out. 

Under abnormal conditions like catching a fire, a built-in thermostat will cut off the heating system.


Heating is necessary for all battery operation at low temperature. Here are a few examples in addition to the automotive industry:

  • Lightbox
  • UPS battery backup
  • Telecommunication station
  • Renewable energy
  • Traffic light control

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