Apparatus and method for automatic recovery of sulfated lead...

H - Electricity – 02 – J

Patent

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H02J 7/00 (2006.01) H01M 10/06 (2006.01) H01M 10/42 (2006.01)

Patent

CA 2369519

Apparatus and method for automatic recovery of sulfated lead acid batteries rely on monitoring battery voltage, current and internal resistance during battery charging. The lead acid battery is recovered for usage by measuring the internal resistance (201) to see if it is so high (203) such that the battery is unrecoverable (205), or so low such that the normal charging methods can be used. If the internal resistance is between the two limits, the battery receives a first constant charge current (213). As the lead acid battery is being charged slowly by a constant charge current, the battery voltage is measured (215). The decrease in the internal resistance (IR) of the battery causes the battery voltage to decrease during charging, while the charging causes the battery voltage to increase. According to the present invention, if it is detected that the battery voltage has reached the minimum voltage and begun to increase in a predetemined period of time (217), the charge current is substantially increased (e.g., doubled) because the capability of the lead acid battery to accept a higher charge current has increased. As the charge current is increased, the recovery and charging of the lead acid battery are advantageously more expedient and efficient.

L'invention concerne un appareil et un procédé de récupération automatique de batterie au plomb sulfaté, le procédé consistant à surveilleur la tension de la batterie, le courant et la résistance interne au cours du temps de charge de la batterie. La récupération de la batterie au plomb, destinée à sa réutilisation, est obtenue par mesure de la résistance interne (201) afin de vérifier si cette dernière est si élévée (203) que la batterie est irrécupérable (205), ou assez faible pour pouvoir utiliser les procédés habituels de charge. Si la résistance interne se situe entre ces limites, la batterie reçoit un premier courant de charge constant (213). Tandis qu'on charge lentement la batterie au plomb avec un courant de charge constant, on mesure la tension de la batterie (215). La baisse de la résistance interne (IR) de la batterie entraine une baisse de la tension au cours de la charge, alors que la charge de la batterie entraine une augmentation de sa tension. Selon la présente invention, si on détecte que la tension de la batterie a atteint un minimum et commence à augmenter dans une période de temps prédéterminée (217), on augmente sensiblement le courant de charge (en le doublant, par exemple), la capacité de la batterie au plomb à accepter un courant de charge supérieur ayant augmenté. Le courant de charge ayant augmenté, la récupération et la charge de la batterie au plomb sont avantageusement plus rapides et plus efficaces.

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