A liquid cooling system for thermal management of lithium-ion battery packs

The development of electric vehicles has accelerated significantly in recent years due to growing concerns about fossil fuel consumption and exhaust carbon emissions. Lithium-ion batteries are currently the most widely used power source for electric vehicles due to their advantages such as high energy density, low self-discharge rate, low maintenance requirements, long cycle life, light weight, and compact structure. However, the performance of lithium-ion batteries is greatly affected by operating temperature. The ideal operating temperature range of lithium-ion batteries is 25~40℃, and the maximum temperature difference between different batteries is less than 5℃. Working in low or high temperature environments can lead to reduced battery performance, shortened life, and even thermal runaway.

Therefore, an excellent battery thermal management system (BTMS) is very necessary to ensure the safe and efficient operation of lithium-ion batteries. According to different cooling strategies, BTMS can be divided into passive cooling systems, active cooling systems and passive and active cooling systems. Hybrid system. In passive cooling systems, there is no additional power consumption, but they also cannot control the cooling system to change the cooling rate. Implement special materials or heat dissipation structures on the surface of lithium-ion batteries to achieve high heat transfer capabilities between the battery and the external environment.