Lead-acid storage battery recovery system using on--off constant current charge and short--large discharge pulses

Mizumoto, I.; Yoshii, Y.; Yamamoto, K.; Oguma, H.
June 2018
Electronics Letters;6/14/2018, Vol. 54 Issue 12, p777
Academic Journal
We report a method of recovering degraded lead-acid batteries using an on--off constant current charge and short--large discharge pulse method. When the increases in inner impedance are within ~20% of the initial impedance value, their system will permit discharge times to recover to a level approximately matching their initial time values. In one experiment, when the discharge time of a <5-year-old leadacid battery used for engine starting had degraded to about 50% of its initial discharge capacity, the authors found that 80% of the initial state discharge time could be recovered and maintained via their method. In a separate experiment, a deep-cycle battery was forcibly degraded by 12 h of depletion at a constant current of 10 A discharged at a terminal voltage of 10.2 V. The results of that experiment show that use of their on--off constant current charge method for the deep-cycle battery (recovered at 80% initial discharge time) quadrupled the post-recovery discharge time in comparison with a battery recovered via constant voltage charge. Taken together, these results indicate that use of their proposed on--off constant current charge system can successfully recover both degraded engine start and deep-cycle lead-acid batteries.


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