Method of controlling the recharging of storage cells, and monitoring their state of charge
US4247812A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 10, 1978 |
| Grant date | Jan 27, 1981 |
| Priority date | — |
| Expiry date | Oct 10, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/3832
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
After a cell has discharged a quantity Q.sub.o of electricity, charging is controlled by measuring the quantity k Q.sub.o 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 Q.sub.o of electricity discharged, in other words as an increasing function of the relative depth of discharge Q.sub.o /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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.