IEEJ Transactions on Power and Energy
Online ISSN : 1348-8147
Print ISSN : 0385-4213
ISSN-L : 0385-4213
Thermal Behavior of Nickel-Metal Hydryde Battery during Charge Cycle
Yoichi FujiokaShigeaki KagemeTakamasa OshimaKohei ItoKazuo Onda
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2002 Volume 122 Issue 12 Pages 1417-1423

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Abstract

The nickel-metal hydride battery (Ni/MH) bas been developed as a power source for the hydrid electric vehicle (HEV) and the pure electric vehicle (PEV). But the larger battery with higher capacity than today's is desirable for their diffusion of HEV and PEV. The larger battery tends to have the temperature and current density distributions at its inside and the distribution deteriorates the battery's performance and life. So some simulation codes are beneficial for developing the large battery. We have studied here the thermal behavior of a small Ni/MH battery at charge cycle to develop the simulation code including the main and side reactions. The heat sources by the overpotential, the entropy change, the hydrogen occlusion and the side reaction recombination heat are measured or surveyed to model the battery. The currents for main and side reactions are also measured experimentaly with the residual oxygen by the side reaction stored in the battery. By using these data our thermal model for Ni/MH battery estimates its temperature increase during charge cycle, which is compared to the measured temperature in good agreement between them.

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© The Institute of Electrical Engineers of Japan
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