Auto Industry Thermal Design Scheme

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

• 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.

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;