Auto Industry Thermal Design Scheme

Auto Industry Thermal Design Scheme

The Current Problem Of Power Battery Temperature

The cost, performance and life of the power battery have a key impact on the cost and safety of electric vehicles; the temperature of the battery can directly determine the performance, usage time and safety of the lithium-ion battery.

Lithium-ion battery heat generation characteristics: complex, transient
  • Temperature is too high
  • Significantly reduced performance and lifespan
  • extremely high temperature
  • Temperature too low
  • The cruising range is greatly reduced
  • Extremely low temperature
  • Car not working

Characteristics of thermal conductive materials

  • soft texture
  • insulation
  • High thermal conductivity
  • specific heat capacity
  • flame retardant
  • low density
  • cheap price
Special requirements for thermal conductive materials for lithium-ion battery packs

The amount of thermally conductive material is large: the density is low – reducing the density of thermally conductive materials helps to reduce the weight of the car and improve the endurance.

The heat generation of the battery is complex and transient: high heat capacity – increasing the heat capacity of the material can effectively absorb the instantaneous heat and keep the battery temperature stable.

Battery safety: High flame retardant – Reinforcing the flame retardant properties of the material can improve the safety of the battery pack under abnormal conditions and reduce losses.

Automotive DC-DC Converters

● Hybrid electric vehicles (HV) and electric vehicles (EV) use DC-DC converters

● The DC-DC converter adjusts the DC power of the battery to a DC voltage suitable for each electronic equipment part and distributes it.

● The loss during voltage adjustment generates heat, so the DC/DC converter needs to dissipate heat to the outside.

● A heat-dissipating silicone rubber sheet is required between components such as transistors, the converter case and the vehicle body.

Power battery thermal management goals

Safe · Stable · Efficient · Cheap

  • High temperature heat dissipation, low temperature heating, to ensure that the single battery is in a suitable working temperature range;
  • Reduce the temperature difference inside the single battery to ensure the uniform temperature distribution of the single battery;
  • Maintain the temperature balance inside the battery pack to avoid the imbalance between the batteries and reduce the performance;
  • Eliminate the danger of battery failure or even explosion caused by thermal runaway;
  • Effective ventilation to ensure that the potentially harmful gas generated by the battery can be discharged in time to ensure the safety of the battery;
  • Accurate and sensitive monitoring and management of temperature and other related parameters, with reasonable response strategies for abnormal situations;
  • Meet the requirements of light and compact electric vehicles, low cost, easy installation and maintenance;
Thermal pads in automotive LED lamps
Thermal pads in natural heat dissipation power battery packs
Thermal pads in DC-DC converters
Thermal Pads in PTC Heaters for Vehicles

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