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- Categories:New Energy Vehicle Battery Cooling Application Solution
- Time of issue:2020-06-18 00:00:00
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Power Battery Thermal Management Solutions
1. Functions of the thermal management system
Accurately measuring and monitoring the temperature of the battery.
Efficient heat dissipation at high temperatures to stabilize the battery pack temperature.
Rapid and uniform heating of batteries at low temperatures.
ensure uniform temperature distribution of the battery.
Effective ventilation in case of harmful gases.
2. Characteristics and parameters of phase change thermal conductivity technology
The products are isothermal. The optimized product conducts 50W of power over a length of 300mm with a temperature difference of only 0.5 degrees.
Equivalent thermal conductivity up to 8000-200000W/m-K
Lightweight, only 1/3 of the size of aluminum.
3. Combination of thermal management systems and phase change heat transfer technology
Phase change thermal conductivity has good isothermal properties, so the internal temperature can be determined by measuring the external temperature of the battery pack using phase change thermal conductivity technology. This simplifies temperature measurement and makes it easier to detect faults.
Phase change thermal conductivity simplifies the structure of the cooling system and improves reliability and maintainability.
Phase change technology has good isothermal properties, which makes the temperature of the battery more uniform when heated in low temperature environment.
The good isothermal properties of the phase change conduction technology can ensure uniform temperature of the battery pack.
Even if a large amount of heat is generated when a battery fails, the impact on other batteries can be minimized.
4. commonly used battery thermal management system
The main advantages of the air cooling method are.
Simple structure and relatively low weight.
There is no possibility of leakage of liquid.
Effective ventilation in the event of the generation of hazardous gases.
Lower cost.
The disadvantages are low heat transfer coefficient between air and battery surface, weak cooling capacity and slow heating speed.
The liquid cooling system has a higher heat transfer coefficient compared to air, which can quickly take away the heat generated by the battery to effectively reduce the temperature of the battery.
Liquid cooling is mainly divided into direct contact and indirect contact two ways.
Liquid cooling system can achieve good effect, but its system is complicated and its reliability is the lowest among all cooling methods.
The phase change energy storage type thermal management system is simple, reliable and energy saving, which mainly plays the role of cutting peak and filling valley and reduces the temperature fluctuation of battery pack. It is mainly used in combination with other thermal management methods as a supplement.
The phase change conductive thermal management system has the characteristics of high heat transfer efficiency, significant cooling effect and long service life, etc. Compared with the air cooling effect, the phase change storage thermal management system is better than the liquid cooling system.
Compared with the air cooling effect is better, compared with the liquid cooling system is more simple, reliable and easy to maintain.
But the program is high technology content, slightly higher cost.
5. Thermal management solution for batteries using phase change thermal conductivity technology.
5.1 Soft pack battery liquid cooling system solutions
5.2 Liquid-cooled heat exchanger system for soft-pack battery
The heat of the battery is transferred to the liquid cooling plate through the phase change conduction plates and then removed by the coolant.
5.3 Cylindrical cell air cooling system options
5.4 Cylindrical cell air-cooled heat exchanger systems
6.Cylindrical battery air cooling case
At the end of the third cycle of charging, the average temperature of the battery was 39.01 degrees and the maximum temperature of the battery was 40.81 degrees. The maximum temperature difference of the cell is 4.15 degrees and the average temperature of the pole ears is 41.93 degrees. The cell temperature distribution is shown below (each intersection of the horizontal and vertical grids represents the location of one cell). ：
The results of this test are tabulated below：
|
cycle time |
Charging time |
Average cell temperature at end of cycle |
Maximum battery temperature at end of cycle |
Maximum temperature difference between cells at end of cycle |
Mean auroral temperature at the end of the cycle |
Inlet and outlet air temperature difference at the end of the cycle period |
Ambient temperature |
|
三 |
22min |
39.01 |
40.81 |
4.15 |
41.93 |
4.10 |
29.4 |
The system's heat dissipation capacity meets the usage requirements.
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