Multicell battery monitoring system with single sensor wire

G - Physics – 01 – R

Patent

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G01R 31/36 (2006.01)

Patent

CA 2117166

A method for detecting the condition of the individual cells of a bank of serially connected battery cells using a single common sensing wire connected through respective non-linear component switching means to respective reference terminals located between adjacent batteries and at the end of the battery assembly, which method comprises: injecting into the common sensing wire a voltage or current of magnitude, polarity and duration sufficient to serially alter the common state of the respective switching means; detecting an instantaneous change of impedance at points of transition of the state of the individual switches; determining the voltage and/or current of the common sensing wire at the points of rapid change of impedance; and providing output indicating the condition of at least a deteriorating one of said individual batteries based on the voltage and/or current determined at the points of change of impedance.

Cette invention concerne une méthode de détection de l'état des cellules individuelles connectées en série d'une batterie, au moyen d'un seul fil détecteur commun connecté en passant par des moyens de commutation de composants non linéaires aux bornes de référence respectives situées entre batteries adjacentes et au bout de l'assemblage de cellules. La méthode comprend les étapes suivantes : injection dans le fil détecteur commun d'une tension ou d'un courant de grandeur, polarité et durée suffisantes pour modifier en série l'état commun des moyens de commutation; détection de la variation instantanée d'impédance aux points de transition d'état des différents moyens de commutation; détermination de la tension et/ou de l'intensité du courant dans le fil détecteur commun aux points de variation rapide de l'impédance; et affichage d'une valeur de sortie correspondant à l'état d'au moins une cellule en voie de détérioration, en fonction de la tension et/ou de l'intensité du courant mesurées aux points de variation d'impédance.

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