Electrical system comprising switched cells and method for controlling such a system

Patent metadata

Field	Value
Publication number	US-11658485-B2
Application number	US-201916972135-A
Country	US
Kind code	B2
Filing date	Jun 4, 2019
Priority date	Jun 6, 2018
Publication date	May 23, 2023
Grant date	May 23, 2023

Abstract

A method of controlling an electric system including electric cells. The method includes the steps of: a) determining a first (second) priority table including first (second) cell priority levels for a system charge (discharge) operation; b) determining the average current exchanged by each cell over a time window according to the cell implementation number in a cell connection sequence; c) determining a classification of the cell implementation numbers by increasing or decreasing order of the average current; d) assigning the implementation numbers according to the order of the classification to the cells by increasing or decreasing number of the priority levels of the first or second priority table; and e) connecting or disconnecting the cells according to the order of the assigned implementation numbers.

First claim

The invention claimed is:

1. A method of controlling an electric system comprising first and second terminals, electric cells, and switches configured to connect or disconnect the cells in series and/or in parallel between the first and second terminals, the method comprising the steps of:
a) determining a first priority table comprising first cell priority levels for a system charge operation and a second priority table comprising second cell priority levels for a system discharge operation;
b) determining data representative of the average current or of the average electric power exchanged by each cell over a time window according to the cell implementation number in a cell connection sequence;
c) determining a classification of at least part of the cell implementation numbers by increasing or decreasing order of the data representative of the average current or of the average electric power;
d) assigning the implementation numbers according to the classification order to the cells by increasing or decreasing order of the priority levels of at least one of the first or second priority tables; and
e) controlling the switches to connect or disconnect the cells according to the order of the assigned implementation numbers.

2. The control method according to claim 1 , further comprising, at step e), the reception by the system of a new set point and the control of the switches to connect the cells according to the order of the assigned implementation numbers.

3. The control method according to claim 1 , wherein at step c), all the cell implementation numbers are classified by increasing or decreasing order of the data and wherein, at step d), all the implementation numbers are assigned to the cells by increasing or decreasing order of the priority levels of one of the first or second priority tables.

4. The control method of claim 1 , wherein the data may have a first sign or a second sign opposite to the first sign, the method comprising, at step c), determining a first classification of the cell implementation numbers by increasing or decreasing order of the data of the first sign and determining a second classification of the cell implementation numbers by increasing or decreasing order of the data of the second sign, the method further comprising, at step d), assigning the implementation numbers according to the order of the first classification to the cells by increasing or decreasing order of the priority levels of the first priority table and assigning the implementation numbers according to the order of the second classification to the cells by increasing or decreasing order of the priority levels of the second priority table.

5. The control method according to claim 1 , wherein the cells are disconnected according to one of at least two disconnection rules, wherein steps b) and c) are carried out for each disconnection rule, the method comprising, for the implementation of step d), selecting a first classification obtained with the first disconnection rule or a second classification obtained with the second disconnection rule according to the comparison of the data of the first and second classifications with desired data.

6. The control method according to claim 5 , wherein the first disconnection rule is that the first cell to be connected is the last cell to be disconnected and wherein the second disconnection rule is that the first cell to be connected is the first cell to be disconnected.

7. The control method according to claim 1 , wherein the time window is shorter than 500 ms.

8. The control method according to claim 2 , wherein the set point is selected from the group comprising a set point for the delivery of a voltage between the first and second terminals, a set point for the delivery of a current to the first terminal, or a set point for the number of electric cells.

9. The control method according to claim 1 , wherein the first priority table is used during the absorption by the system of electric energy originating from the outside and wherein the second priority table is used during the delivery of electric energy by the system to the outside.

10. The control method according to claim 9 , comprising passing from the use of the first priority table to the second priority table when the system passes from the absorption of electric energy originating from the outside to the delivery of electric energy to the outside and passing from the use of the second priority table to the first priority table when the system passes from the delivery of electric energy to the outside to the absorption of electric energy originating from the outside.

11. An electric system comprising first and second terminals, electric cells, switches configured to connect or disconnect the cells in series and/or in parallel between the first and second terminals, and a processing module configured to:
a) determine a first priority table comprising first cell priority levels for a system charge operation and a second priority table comprising second cell priority levels for a system discharge operation;
b) determine data representative of the average current or of the average electric power exchanged by each cell over a time window according to the cell implementation number in a cell connection sequence;
c) classify at least part of the cell implementation numbers by increasing or decreasing order of the data representative of the average current or of the average electric power;
d) assign implementation numbers according to the classification order to the cells by increasing or decreasing order of the priority levels of at least one of the priority tables; and
e) control the switches to connect or disconnect the cells according to the order of the assigned implementation numbers.

12. The electric system according to claim 11 , wherein the cells are electric charge storage elements and/or electric generators.

13. The electric system according to claim 12 , wherein the cells are electric accumulators.

14. The control method according to claim 1 , wherein an order of the second cell priority levels for the system discharge operation is different from an order of the first cell priority levels for the system charge operation.

15. The electric system according to claim 11 , wherein an order of the second cell priority levels for the system discharge operation is different from an order of the first cell priority levels for the system charge operation.

Assignees

• Commissariat Energie Atomique

Inventors

• Despesse Ghislain
• Bacquet Sylvain
• Cassarino Léandro
• Fernandez Eric
• Lopez Yan
• Thomas Rémy

Classifications

• H02J7/865

  Battery or charger load switching, e.g. concurrent charging and load supply (H02J7/50 takes precedence) · CPC title

• H02J7/575

  Parallel/serial switching of connection of batteries to charge or load circuit · CPC title

• H02J7/84

  Control of state of health [SOH] · CPC title

• H02J7/82

  Control of state of charge [SOC] · CPC title

• H02J7/52

  for charge balancing, e.g. equalisation of charge between batteries · CPC title