Method for charging a battery of an autonomous system

• US 20080278111A1
• Filed: 04/30/2008
• Published: 11/13/2008
• Est. Priority Date: 05/11/2007
• Status: Abandoned Application

• Current Assignee: Commissariat a L'Energie Atomique (AES Corporation)
• Original Assignee: Commissariat a L'Energie Atomique (AES Corporation)
• Inventors: Labrunie, Antoine, Genies, Sylvie, Mattera, Florence
• Application Number:
  US12/149,368
• Publication Number:
  US 20080278111A1
• Time in Patent Office: Days
• US Class Current: 320/101
• CPC Class Codes: H02J 7/0071 with a programmable schedule
• CPC Class Codes: H02J 7/35 with light sensitive cells
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02E 60/13 Energy storage using capacitors

Abstract

In an autonomous system, the method for charging a power storage element from a generator comprises temperature measurement, with switching from a first charging mode to a second charging mode in which the voltage is regulated by the temperature. The first charging mode is charging at regulated current to a maximum current value which is a function of the state of charge of the power storage element and of the temperature of the power storage element. Switching is performed when the voltage at the terminals of the power storage element reaches a preset threshold value, itself a function of the value of the current and temperature of the power storage element.

Claims

1. A method for charging a power storage element of an autonomous system from a generator, method comprising measurement of the temperature, switching from a first charging mode to a second charging mode when the voltage at the terminals of the power storage element reaches a preset threshold value, wherein the first charging mode is a current charging mode wherein the current is regulated to a maximum value of the charging current which is a function of the state of charge of the power storage element and of the temperature and wherein the second charging mode is a temperature-regulated voltage charging mode.

2. The method according to claim 1, wherein said voltage threshold value is a function of the temperature of the power storage element and of the measured charging current.

3. The method according to claim 1, wherein said voltage threshold value is linearly decreasing with increasing temperature of the power storage element.

4. The method according to claim 1, wherein said maximum charging current value is linearly increasing with the temperature and linearly decreasing with the state of charge of the power storage element.

5. The method according to claim 1, wherein in the second charging mode, the voltage is regulated by the ambient temperature.

6. The method according to claim 1, wherein charging at a voltage regulated by the temperature is interrupted when the charging current is lower than a preset current threshold.

7. The method according to claim 1, wherein charging at a voltage regulated by the temperature is interrupted if the temperature difference between the temperature of the power storage element and the ambient temperature is greater than a preset value.

8. The method according to claim 1, wherein charging at a voltage regulated by the temperature is interrupted if the rate of progression of the temperature difference between the temperature of the power storage element and the ambient temperature is greater than a preset threshold.

9. The method according to claim 1, wherein the generator is a photovoltaic panel.

10. The method according to claim 1, wherein the generator is a wind power generator.