Thermal management system with regional air cooling heat dissipation for lithium-ion power battery pack

Abstract

The invention discloses a thermal management system with regional air cooling heat dissipation for a lithium-ion power battery pack. The system comprises a box body provided with an air inlet and an air outlet, wherein an upper separation board and a lower separation board which are parallel to each other and are provided with mounting holes are arranged in the box body; a plurality of single lithium ion batteries which are mutually parallel are vertically arranged in the box body. According to the thermal management system disclosed by the invention, a space between the box body and the single lithium ion batteries is divided into three regions which are basically identical; according to different heat productivities of different regions of the single lithium ion batteries, all the regions are cooled by adopting cooling air with different flow speeds, so that the maximum temperature of the lithium ion batteries can be effectively reduced, basically-identical temperature can be obtained by all the regions of the lithium ion batteries, the temperature difference of all the regions of the lithium ion battery pack is reduced, and the batteries are enabled to keep better consistency; meanwhile, energy consumption is reduced, and economic performance of the system is improved.

Description

[0001] Technical field: [0002] The invention relates to a thermal management system of a lithium-ion power battery pack with sub-area air cooling and heat dissipation. [0003] Background technique: [0004] Lithium-ion battery packs generate a lot of heat during charging and discharging. When a square lithium-ion battery is charged and discharged at a low rate, the heat generated by each part is relatively balanced. When it is charged and discharged at a high rate, the heat generation rate is greater in the area close to the battery tab. , limited by the battery material, the thermal conductivity of the square battery is very low, and the temperature of the tabs, the vicinity of the tabs, and the middle of the battery is relatively high. If the various areas of the battery cannot be cooled in a timely and effective manner, the temperature of the battery will be too high and the temperature distribution will be uneven. and so on, thus affecting its working performance. In or...

AI Technical Summary

Problems solved by technology

The air cooling system has a simple structure and is easy to maintain, but the cooling effect is poor under conditions such as high ambient temperature and continuous heavy load

[0006] However, when domestic and foreign researchers design the thermal management system of lithium-ion battery packs, they regard the single battery as a uniform heating body, without considering the difference in heat production in different areas of the single battery, and use the same flow rate of cooling air to cool the entire battery. The battery pack is cooled. In order to reduce the temperature in the area near the battery tab, a larger cooling wind speed is used, which increases energy consumption and reduces economic efficiency.

Images