Abstract

A method of estimating the durability of the nickel-metal hydride batteries employed in hybrid electric vehicles based on factors contributing to their deterioration was studied. The factors in battery deterioration are battery temperature, current load and state of charge. Based on the expectation that the formulation of a reaction rate equation employing chemical kinetics would enable the durability of the battery to be estimated, the Eyring equation, which enables consideration of temperature and another stress factor was focused on. The number of stress factors in the equation was increased to study the applicability of current load and state of charge.It was shown that the values of frequency factors of the various factors in battery deterioration in the equation were the same as those obtained in durability tests. These results confirmed that the modified equation enabled multiple factors to be employed in estimations of battery life. Quantification of each factor in deterioration through the use of this reaction rate equation has enabled the estimation of battery life.

References

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Author (organization or company)

• Tatuo MINAMI（Tochigi R&D Center）

Publication Information

Article of Honda R&D Technical Review Vol.16 No.1 (257 - 262)

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Citation Information