Authors

K. Yoshiya, S. Ishiguchi, T. Kakizoe, MIKUNI CORPORATION, Tokyo, Japan

Year

2026

Print Info

Production/Publication ÖVK

Summary

Battery temperature control is essential for BEVs/PHEVs; however, conventional water-cooled BTMS relies on discrete switching between heating and cooling, and the switching hysteresis band is constrained because it must be set considering noise and disturbances.
This study evaluates a coolant-mixing approach using the Mikuni smart Multi-Valve (MsMV), which mixes high- and low-temperature coolant loops to continuously generate the battery-inlet coolant temperature near the target value.
The proposed method and the conventional method are compared under identical heat-source and heat-exchanger conditions through simulations using a simplified 1D thermal model of an electric vehicle, and temperature fluctuation after the battery temperature reaches the 30 °C setpoint is evaluated by peak-to-peak deviation. For the conventional method, peak-to-peak deviations are 6.5 °C, 4.2 °C, and 2.9 °C for hysteresis bands of ±Δ with Δ = 2 °C, 1 °C, and 0.5 °C, respectively, whereas the coolant-mixing method achieves 0.3 °C.
These results suggest that the MsMV coolant-mixing function can substantially reduce temperature fluctuation near the target value in water-cooled BTMS.

ISBN

978-3-9504969-5-6

DOI

https://doi.org/10.62626/3sgy-xzqn Copy link

Order Members Login