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Developing a monitoring system for Toyota Prius battery-packs for longer term performance issues

The Toyota Prius battery pack consists of 38 individual battery blades, each blade contains 6 NiMH cells in series. This means that each pack contains 228 NiMH cells. Given this number of individually manufactured cells combined into a large battery pack, any individual cell or a blade getting weaker than all other linearly degrading cells, will become the performance limiting element in the pack. For example in a situation where one blade weakens down to 1200mAh compared to all other 37 blades maintaining approximately 2400mAh capacity will make the car run only 1.3 km in EV mode, compared to 2.6 km if all 38 blades are of 2400mAh capacity. In order to identify such individually weak cells, a supercapacitor based monitoring system is designed and the paper indicates the approach in developing this system, together with some details explaining the general performance of the overall system and how the new monitoring system can help in managing the battery pack life issues in the Toyota Prius.
Conference Contribution
Type of thesis
Leijen, P., & Kularatna, N. (2013). Developing a monitoring system for Toyota Prius battery-packs for longer term performance issues. In Industrial Electronics (ISIE), 2013 IEEE International Symposium (pp. 1–6). Washington, DC, USA: IEEE. http://doi.org/10.1109/ISIE.2013.6563876
This is an author’s accepted version of a paper published in the Proceedings: IEEE Transactions on Instrumentation and Measurement. ©2013 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.