System for managing the charging of a storage battery

• US 9,941,721 B2
• Filed: 03/26/2013
• Issued: 04/10/2018
• Est. Priority Date: 03/30/2012
• Status: Active Grant

• Current Assignee: Ampere SAS
• Original Assignee: Renault Sas (Renault)
• Inventors: Peuchant, Thomas, Le Vourch, Yves, Saint-Marcoux, Antoine
• Primary Examiner(s): WILLIAMS, ARUN C
• Application Number:
  US14/389,512
• Publication Number:
  US 20150054470A1
• Time in Patent Office: 1,841 Days
• Field of Search: 320162
• CPC Class Codes: G01R 19/16542 for batteries charge condition monitoring in G01R31/36
• CPC Class Codes: H02J 7/0014 Circuits for equalisation of charge between batteries
• CPC Class Codes: H02J 7/0016 using shunting, discharge or bypass circuits
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

The invention relates to a system for managing the charging of at least one cell of a storage battery, comprising: two separate means for comparing the voltage across the terminals of said cell with a threshold voltage; and two separate controlling means adapted to control two actuators, respectively, in order to interrupt the charging of the storage battery when said first or second comparing means detects that the voltage across the terminals of said cell exceeds the threshold voltage. One of the actuators is formed by a charger that is connected to said storage battery in order to recharge said cells.

Claims

1. A system for managing the charging of at least one cell of a storage battery, including:

a charger configured to charge said storage battery; and

first circuitry configured to

compare voltage at terminals of said at least one cell with a threshold voltage, and

control the charger connected to said storage battery to stop charging the storage battery when the first circuitry detects that the voltage at the terminals of said at least one cell is greater than said threshold voltage,

second circuitry, separate from the first circuitry, configured to

compare the voltage at the terminals of said at least one cell with said threshold voltage, and

control at least one relay to an open state to prevent the charging of the storage battery by said charger when the second circuitry detects that the voltage at the terminals of said at least one cell is greater than said threshold voltage.

2. The management system as claimed in claim 1, wherein said at least one relay is located between one of terminals of the storage battery and one of terminals of the charger connected to said storage battery in order to recharge said cells.

3. The management system as claimed in claim 2, wherein said first and second circuitry are part of a first microprocessor and a second microprocessor having different architectures, respectively.

4. The management system as claimed in claim 1, wherein said first and second circuitry include a first analog-digital interface and a second analog-digital interface having different architectures, respectively.

5. The management system as claimed in claim 4, wherein said first analog-digital interface digitizes the voltage at the terminals of said at least one cell and transmits the voltage to a comparator which compares the digitized voltage with the threshold voltage.

6. The management system as claimed in claim 5, wherein said comparator is part of the first circuitry.

7. The management system as claimed in claim 4, wherein said second analog-digital interface is configured to carry out an analog comparison of the voltage at the terminals of said at least one cell and the threshold voltage and to transmit a digitized signal dependent upon the result of said comparison.

8. The management system as claimed in claim 1, wherein said charger is separate from said at least one relay.

9. The management system as claimed in claim 1, wherein said at least one relay includes two relays located between two terminals of the charger and two terminals of the storage battery, respectively.

12. The system as claimed in claim 1, wherein the first circuitry and second circuitry check the voltage at the terminals of said at least one cell at different intervals.

10. A system for managing the charging of at least one cell of a storage battery, including:

a first means for comparing the voltage at terminals of said at least one cell with a threshold voltage, and

a first control means for controlling a charger to stop charging the storage battery when said first comparing means detects that the voltage at the terminals of said at least one cell is greater than said threshold voltage,

a second means for comparing the voltage at the terminals of said at least one cell with said threshold voltage, which means is separate from said first comparing means, and

a second control means, which is separate from said first control means and which is suitable for controlling at least one relay to an open state to prevent the charging of the storage battery by the charger when said second comparing means detects that the voltage at the terminals of said at least one cell is greater than said threshold voltage,

wherein said charger is connected to said storage battery in order to recharge said cells.

11. A method for managing the charging of at least one cell of a storage battery, including:

comparing via first circuitry, voltage at terminals of said at least one cell with a threshold voltage, and

controlling, via the first circuitry, a charger to stop charging the storage battery when the first circuitry detects that the voltage at the terminals of said at least one cell is greater than said threshold voltage,

comparing, at second circuitry separate from the first circuitry, the voltage at the terminals of said at least one cell with said threshold voltage, and

controlling, via the second circuitry, at least one relay to an open state to prevent the charging of the storage battery by the charger when the second circuitry detects that the voltage at the terminals of said at least one cell is greater than said threshold voltage,

wherein said charger is connected to said storage battery in order to recharge said cells.