Method of controlling the recharging of storage cells, and monitoring their state of charge
First Claim
1. A method of controlling the recharging of a storage cell comprising determining the quantity of electricity Qo supplied by the cell during a period of discharge;
- measuring the quantity of electricity which is supplied to it during recharging following said discharge period; and
stopping the charging when the quantity reaches kQo, k being a recharging factor greater than 1, wherein the recharging factor k is varied as an increasing function of the quantity Qo of electricity supplied by the discharging storage cell.
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Abstract
After a cell has discharged a quantity Qo of electricity, charging is controlled by measuring the quantity k Qo of electricity supplied to the cell, where k is the recharging coefficient and greater than 1. The value of k is varied as an increasing function of the quantity Qo of electricity discharged, in other words as an increasing function of the relative depth of discharge Qo /C of the storage cell, where C is its capacity. The state of charge is monitored by generating a magnitude g which is a function of the charging or discharging current. This is done by algebraically integrating the current I over time while using scaling coefficients a=g/I of different values during charging and during discharging. The value of a is varied during charging so that its average value over a complete recharging operation is a decreasing function of the initial depth of discharge from which the recharging operation starts recharging.
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Citations
8 Claims
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1. A method of controlling the recharging of a storage cell comprising determining the quantity of electricity Qo supplied by the cell during a period of discharge;
- measuring the quantity of electricity which is supplied to it during recharging following said discharge period; and
stopping the charging when the quantity reaches kQo, k being a recharging factor greater than 1, wherein the recharging factor k is varied as an increasing function of the quantity Qo of electricity supplied by the discharging storage cell. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- measuring the quantity of electricity which is supplied to it during recharging following said discharge period; and
Specification