Improvement of Thermal Performance of Electric Vehicle Battery Pack with Phase-change Material

摘要

The temperature distribution and thermal performance of PCMs in batteries were examined in detail in this study using a lithium polymer pouch battery with 3.7 V/16 Ah at different discharge rates and other various conditions, such as practical load conditions. The results provided data that satisfied the design specifications and enabled the control of battery temperature under safe operating conditions. The conclusions obtained from the experimental results are summarized as follows. 1. The sensors used to monitor the temperatures of batteries enabled the detection of the maximum and control temperatures of batteries with selected PCMs. 2. The maximum battery surface temperature reached 35.9 ℃ during discharge under different load conditions without PCMs. 3. EG26 in the simulation showed that the temperature of the battery with load was 31.3 ℃. However, without PCMs, the battery surface was 35.9 ℃. Hence, the maximum temperature difference was 4.6 ℃. This means that the temperature of the battery decreased owing to the high thermal properties of EG26. The experimental results obtained with EG26 showed that the battery surface temperature was 30.5 ℃, whereas without EG26, the battery surface temperature was 35.9 ℃. A difference of 5.4 ℃ was observed with EG26.