When I first joined the company in 2010, I saw that I was fresh, so I wrote two articles at the time (2010-09-26 see EDN's yulzhu blog), and more based on the Volt's cooling system and AVL and related SAE papers. .
Electric vehicle polymer lithium battery liquid cooling method 1
Electric vehicle polymer lithium battery liquid cooling method 2
Now it seems that all engineers who do power electronics and battery cooling are integrated into the thermal systems engineering team. There is no big conceptual difference between the thermal management of the battery system and the requirements of other components. The core problem lies in the problem of the battery in the high temperature range and the problem in the low temperature range. If we compare the thermal design of power electronics, we will go the same way.
1) Power electronics cooling in the "Robust Thermal Design of a DC-DC Converter in an Electric Vehicle": the thermal design of the entire electronic product (including the motor) in the process of transplanting industrial electrification into the car , motor controllers, DC-DC high-voltage converters and chargers, the most special is the battery pack. The heat dissipation requirements of these components need to be considered in consideration of the environment in which the components are arranged, and then carefully considered according to this environmental condition. In the summer high temperature environment, the car has to withstand the ambient temperature of the ground up to 40 degrees, and the heat of the passenger compartment is also dissipated. If the equipment placed on the chassis faces the risk of systematic thermal management.
After a DC/DC pair is determined for the main heating element, the heat dissipation model is evaluated based on the current profile. In the air-cooling system, we can take out the design adjustments: (shell material, PCB size, copper layer size, etc.), and then select better control parameters and result combinations based on parameter sensitivity.
2) The former engineering director was a Canadian. He used liquid cooling for a certain Qin, power electronics, and the battery system was naturally cooled. The high temperature and low temperature problems of the battery include:
a) The high temperature is high, and the life is greatly affected. In particular, the temperature difference of the monomer causes changes in the capacity and parameters, so that a SOC consideration of the Pack is lost.
b) Low temperature and low temperature can not be charged with high power, low temperature energy recovery is limited, low temperature makes PTC energy release problems, customers can only drive the speed limit car in the cold car inside the bored drive.
The engineer who makes the battery will give you a bunch of restrictions, otherwise
Unable to guarantee cruising range accuracy
Unable to guarantee fuel economy of the vehicle
Unable to guarantee that the individual Warrenty meets the requirements
Unable to guarantee the difference between monomers
Unable to solve extreme problems under certain conditions
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