期刊
JOURNAL OF POWER SOURCES
卷 138, 期 1-2, 页码 327-339出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2004.05.058
关键词
NiMH; batteries; equalizer
A unique method has been developed to equalize nickel metal hydride (NiMH) battery packs using a new selective equalizer. This equalizer detects batteries either at a very low state of charge (SOC) or at an extremely high SOC. In this system a set of electromechanical relays is connected in a matrix to route boost current to the weaker batteries. The relay switching is controlled by a 32 bit microcontroller, and the boost current is supplied by a boost charger. Once a weak battery is detected, it is scheduled for a specific boost time by a special Round Robin (RR) algorithm. The equalizer was tested on a pack of 12 series connected 12 V 93 ampere hour (Ah) NiMH batteries. Test results show that the equalizer was able to re-balance an artificially unbalanced pack, and the capacity was increased by 27% within six charge-discharge cycles. Results indicate the number of cycles required to re-balance the pack was significantly reduced by using this technique. (C) 2004 Elsevier B.V. All rights reserved.
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