Energy storage battery temperature trend

Lithium-ion batteries, as the core component of electric vehicles, have their performance and safety significantly impacted by temperature. This paper begins by introducing the fundamental components and operating principles of lithium-ion batteries, followed by an analysis of how temperature affects battery performance and safety.

Studies have shown that during discharge, the current of a battery cell with a higher temperature is significantly higher than that of a battery with a lower temperature, which leads to a significantly faster degradation rate in high-temperature batteries compared to those operating under normal conditions .

Currently, most of the temperature monitoring and thermal management of power batteries are carried out on the outer surface of the battery, lacking a comprehensive review of internal temperature monitoring and control of power batteries.

Challenges of internal temperature measurement in power batteries The internal temperature measurement of power batteries is essential for optimizing performance and ensuring operational safety, particularly in high-demand applications such as electric vehicles and large-scale energy storage systems.

These methods model parameter variations during battery operation to predict temperature by establishing explicit or implicit relationships between temperature and other parameters. This paper presents the heat generation principles of lithium-ion batteries during operation and the changes in battery mechanisms during thermal runaway.

This technique pioneered the direct measurement of temperatures at multiple locations inside large, stacked power batteries. Experimental results indicated that even for batteries as thin as 7 mm, the internal temperature could differ from the surface temperature by >1.1 °C.