External cycle heat management technology for power batteries
External cycle thermal management technology for power batteries (military to civilian technology, ensuring reliable driving and driving range of power batteries in northern winter) solves the problems of low temperature (minimum minus 40 degrees Celsius) thermal management and mileage attenuation for power batteries, leading the industry.
The low-temperature environment external circulation heat management system comes from the military technology of tanks and armored vehicles. In the form of external auxiliary heating, through matching and control, it is ensured that the power battery system can be started and charged normally in an extreme low temperature environment (- 40 ℃). At the same time, incorporating a heating source into the original liquid cooling loop of the battery system can achieve a balanced temperature field with a temperature difference of<± 2 ℃.
Taking the actual life test data of heavy truck lithium iron phosphate battery monomer as an example, under the same 0.5C charging and discharging conditions, the battery capacity remains at 92.4% after 1000 weeks at 45 ℃, and remains at 90% after 2050 weeks at 25 ℃. As of 90%, the cycle life is 55% higher.
Low temperature thermal management technology can effectively control the temperature range of heavy trucks in actual work from 15 to 35 degrees. Especially in the northern low-temperature environment, the effective life can be extended by more than 5%, which is a key technology for the development of electric heavy trucks to the north.
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