Why you Need Thermal Management？
One of the heating needs: cockpit heating
In winter, the driver and passengers need to be warm inside the car, which involves the heating needs of the thermal management system.
Depending on the geographical location of the user, the heating needs vary. A simple example is that the same car company supplying electric cars in Northern Europe may use electric heaters with a rated power of 5kW, while those supplying countries in the equatorial region may only have 2 to 3kW or even no heaters.
In addition to latitude, altitude also has a certain impact, but there is no design specifically for the altitude to make a distinction, because the owner can not guarantee that the car will drive from the basin to the plateau.
The other biggest influence is the people in the car, because whether it is an electric car or a fuel car, the needs of the people inside are still the same, so the design of the temperature demand range is almost copied, generally between 16 degrees Celsius and 30 degrees Celsius, that is to say, the cockpit is not colder than 16 degrees Celsius, heating is not hotter than 30 degrees Celsius, covering the normal human demand for ambient temperature.
Heating needs of the second: high-voltage batteries.
Lithium iron sulfate batteries are limited by low-temperature charging, such as the Hongguang Mini electric car for its lithium iron phosphate battery with low-temperature charging heating function. Ternary lithium batteries, although low temperature than lithium iron phosphate is a drop, but the temperature is low to -7 ℃ below also limits the charging power. So lithium-ion batteries are generally heated to ensure that in the winter low-temperature environment can still be charged to it.
Lithium-ion batteries like to charge and discharge between 15 and 35 degrees, lower or higher will limit the charge and discharge current, but also affect its SOH (State of Health) health status.
However, the battery in the pure electric car is a huge thing, large volume and weight, in order to heat from the low temperature environment to the appropriate temperature to complete the warming, not only to consider the battery can withstand the speed of heating, but also to consider the thermal management system can stabilize the output of heating power, but also to take care of the user's patience waiting for the warming, these are very high requirements for the thermal management system.
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