3550 Battery HiTESTER Series
29
Fig. 8: Temperature characteristics of the
internal resistance in a Ni-MH battery.
Fig. 9: Temperature characteristics of the
internal resistance in a Lithium Ion battery.
5. Conclusion
We developed an internal resistance tester in order measure internal resistance as a means to
quickly and easily evaluate the deterioration of secondary batteries. In this tester, low
resistance measuring techniques based on the AC four-terminal method and the synchronous
detection method were used. In our experiment using this tester to measure the internal
resistance of a variety of types of secondary batteries, it was found that there are different
characteristics for each type of battery. These differences may arise from differences in the
materials of which the batteries are made. We did confirm that it was possible to use this tester
to measure battery characteristics. Even if making a precise evaluation of the deterioration of a
secondary battery on the basis of the results of a charge/discharge test, it should be possible to
provide information that can be used as a guide for determining the state of a battery by
simultaneously measuring the internal resistance and terminal voltage. We now need to
conduct long-term charge/discharge cycle testing on secondary batteries in order to confirm in
detail the relationship between the change in internal resistance and decrease in battery
capacity due to battery deterioration, and also to confirm whether internal resistance is related to
other parameters of secondary battery performance.
References
1. M. Yamanaka, et al: "Operational Life Indicator for Sealed Lead Storage Batteries," Yuasa
Jiho, No. 72, p.p. 29 - 36 (April 1992).
2. M. Kanda: "Backup Battery Performance and Applications," Proceedings of '96 Battery
Technology Symposium (April 1996).
3. T. Fukushima: Suitability of Batteries for Data-related Equipment," Proceedings of '96 Battery
Technology Symposium (April 1996).
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