Design and simulation studies of lithium-ion battery immersion thermal management system based on dielectric coolant
Mei, Youshu (2026)
Kandidaatintyö
2026
School of Energy Systems, Energiatekniikka
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi-fe2026052857828
https://urn.fi/URN:NBN:fi-fe2026052857828
Tiivistelmä
Immersion cooling is an important thermal management method for lithium-ion batteries used in electric vehicles, portable electronic devices, and energy storage systems. During charging and discharging, lithium-ion batteries generate heat. If the heat is not removed effectively, the battery temperature may rise rapidly, leading to lower performance, shorter service life, and safety risks.
This thesis studies a lithium-ion battery immersion cooling system based on dielectric coolant. A simplified battery module and cooling region were built, and numerical simulation was used to analyze the temperature rise and temperature distribution of the system.
The results show that the area-weighted average temperature increased gradually and finally reached about 30.5–31.2 °C. High-temperature regions mainly appeared on the battery surface, side edges, corners, and gaps between cells. The maximum local temperature was close to 55 °C, showing that local heat accumulation still existed.
Overall, dielectric coolant immersion cooling shows good potential for battery thermal management because it provides direct contact between the coolant and battery surface and improves heat dissipation. Future work should focus on coolant flow rate, battery spacing, cooling cavity design, mesh quality, and experimental validation.
This thesis studies a lithium-ion battery immersion cooling system based on dielectric coolant. A simplified battery module and cooling region were built, and numerical simulation was used to analyze the temperature rise and temperature distribution of the system.
The results show that the area-weighted average temperature increased gradually and finally reached about 30.5–31.2 °C. High-temperature regions mainly appeared on the battery surface, side edges, corners, and gaps between cells. The maximum local temperature was close to 55 °C, showing that local heat accumulation still existed.
Overall, dielectric coolant immersion cooling shows good potential for battery thermal management because it provides direct contact between the coolant and battery surface and improves heat dissipation. Future work should focus on coolant flow rate, battery spacing, cooling cavity design, mesh quality, and experimental validation.