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The charge equalizer. A new system to extend battery lifetime in PV-systems, UPS and electric vehicles

: Schmidt, H.; Siedle, C.

Guimaraes, L.; Palz, W.; Reyff, C. de; Kiess, H.; Helm, P.:
Eleventh E.C. Photovoltaic Solar Energy Conference '92. Proceedings : International conference, held at Montreux, Switzerland, 12 - 16 October 1992
Chur: Harwood Academic Publishers, 1993 (EUR 14811/EN)
ISBN: 3-7186-5380-X
Photovoltaic Solar Energy Conference <11, 1992, Montreux>
Conference Paper
Fraunhofer ISE ()

Investigations of battery banks in PV-systems, UPS and electric vehicles show that the inherent different properties of single cells leads to premature failures of the whole battery. Single cell monitoring is no way to overcome this problem. The new "CHarge EQualizer" (CHEQ) introduced in this paper keeps all cells in the same state of charge at all times by transferring energy between the cells. For different applications specially suited realizations of this fundamental principle will be shown. The main advantages of the CHEQ are the protection against overcharging and deep discharging of individual cells, extension of lifetime, decrease of maintenance costs, and the availability of the full nominal battery capacity.