Lithium cell recharging

H - Electricity – 02 – J

Patent

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Details

H02J 7/10 (2006.01) H02J 7/00 (2006.01)

Patent

CA 2199789

Excessive charging of the weaker cells in a battery of lithium cells, during potentiostatic charging, is prevented by providing each cell (S) with a bypass circuit (12) including a MOSFET (T). An integrated circuit (Y) monitors the cell voltage, and if the design voltage of the cell (S) is exceeded the circuit (Y) provides a signal to the gate of the MOSFET (T) so that part of the charging current (I) bypasses that cell (S), while most of the charging current flows through the cell (S). The bypass current flows only while each of the other cells in the battery are coming up to the design voltage, so that little power is dissipated in the bypass circuit (12). If the cells are balanced, so they accept charge equally, then the bypass circuit never carries current; if the cells are not balanced, they will be brought near to balance over a few charge/discharge cycles.

Prévention de charge excessive des cellules plus faible d'une batterie de cellules au lithium, durant une charge potentiostatique, par adjonction, à chaque cellule (S), d'un circuit de dérivation (12), y compris d'un transistor métal-oxyde semi-conducteur (T). Un circuit intégré (Y) contrôle la tension des cellules, et s'il y a dépassement de la tension nominale de la cellule (S), le circuit (Y) envoie un signal à l'électrode de commande du transistor métal-oxyde semi-conducteur (T) de manière qu'une partie du courant de charge (I) contourne cette cellule (S) pendant que la plus grande partie du courant de charge passe à travers la cellule (S). Le courant de dérivation circule seulement lorsque chacune des autres cellules de la batterie arrive à la tension nominale, de sorte que peu de puissance est dissipée dans le circuit de dérivation (12). Si les cellules sont équilibrées, elles acceptent la charge également et le circuit de dérivation ne porte jamais de courant; si les cellules ne sont pas équilibrées, elles seront amenées à un niveau près de l'équilibre après quelques cycles de charge/décharge.

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