Method and device for equilibrating electric accumulator batteries

A method for balancing an electrical accumulator battery, in which an electrical accumulator battery includes accumulators connected together in series and a charge current exhibiting a charging value charges the accumulators, the accumulators exhibiting a maximum charge state, the method comprising:

• charging the accumulators during a charging to increase charge of the accumulators up to their maximum charge state,
• wherein the charging comprises, in order:
• a) feeding the accumulators in series with a charge current at a charging value until one of the accumulators of the battery reaches a maximum charge state;
• b) during a coupling period, coupling the one of the accumulators to terminals of a corresponding discharging element to discharge the one of the accumulators, while the charge current is simultaneously lowered;
• and,
• c) returning to a) after a time period less than or equal to the coupling period.

A balancing device configured to charge an electrical accumulator battery, the electrical accumulator battery including accumulators connected together in series, the accumulators exhibiting a maximum charge state, the balancing device comprising:

• charging means for providing a charge current exhibiting a charging value, the charge current to charge the accumulators during a charging to increase a charge of the accumulators up to their maximum charge state;
• control means and monitoring means, for controlling the charging means so that the charging means feeds the accumulators in series with the charge current at the charging value until the monitoring means monitors one of the accumulators of the battery at its maximum charge state;
• coupling means to be controlled by the control means to couple, during a coupling period, the one of the accumulators to terminals of a corresponding discharging element to discharge the one of the accumulators, while the control means simultaneously lowers the charge current;
• and
• the control means is configured to control feeding of the accumulators with the charge current at the charging value, after a time period less than or equal to the coupling period.