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Thermal Behavior Mechanism of Lithium-ion Batteries for Electric and Hybrid Vehicles

Article of Honda R&D Technical Review Vol.12 No.1

Summary

Thermodynamics experiment and study were carried out for the Lithium-ion batteries that are expected as the power sources for electric and hybrid vehicles. It is confirmed that the heat coming in and going out depend on charging and discharging, respectively. And the heat generation factors will be decomposed to three elements: reaction heat value Qr , polarization heat value Qp , and joule heat value Qj . Furthermore, the contribution degree of each factor was able to be expressed quantitatively, by dividing these heat generation factors for charging and discharging.
The accuracy of thermodynamics logic was verified since the thermodynamics calculation coincided with the experimental data of heat generation for the practical Li-ion batteries for EV. It is possible to utilize the calculation and simulation for the development of Li-ion battery and the establishment of thermal control technology not only for EV but also for HEV.

Reference

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Author (organization or company)

Naoki MARUNO(Tochigi R&D Center)、Kazuhiro ARAKI(Tochigi R&D Center)、Noboru SATO(Tochigi R&D Center)

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