System for managing the charging of a battery and the regenerative braking of a vehicle at least partially powered by the battery and associated regulation method

• US 10,252,625 B2
• Filed: 07/05/2013
• Issued: 04/09/2019
• Est. Priority Date: 07/06/2012
• Status: Active Grant

• Current Assignee: Renault Sas (Renault)
• Original Assignee: Renault Sas (Renault)
• Inventors: Saint-Marcoux, Antoine, Trinh, Do-Hieu, Le Vourch, Yves, Peuchant, Thomas
• Primary Examiner(s): Isla, Richard
• Assistant Examiner(s): Hernandez, Manuel
• Application Number:
  US14/413,119
• Publication Number:
  US 20150191092A1
• Time in Patent Office: 2,104 Days
• Field of Search: 320109, 320162-164
• CPC Class Codes: B60L 53/00 Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
• CPC Class Codes: B60W 10/26 for electrical energy, e.g. batteries or capacitors
• CPC Class Codes: B60Y 2300/92 Battery protection from overload or overcharge
• CPC Class Codes: H02J 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• CPC Class Codes: H02J 7/00036 Charger exchanging data with battery
• CPC Class Codes: H02J 7/0048 Detection of remaining charge capacity or state of charge [SOC]
• CPC Class Codes: H02J 7/14 for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles

Abstract

An electrical power supply system includes a battery of cells, the battery including an ammeter configured to measure battery current flowing through the battery, and at least one voltage sensor configured to measure voltage at terminals of a cell. An electronic control unit is configured to deliver a maximum permissible electrical power setpoint. The control unit is configured to calculate a maximum permissible electrical power associated with a cell by taking the minimum of at least two values, including a first electrical power and a second electrical power.

Claims

1. A method for regulating a recharging phase of an electrical battery, comprising:

limiting electrical power sent to the battery to recharge the battery during the recharging phase by computing a maximum power that is acceptable by the battery as a multiple of a maximum acceptable power associated with a selected cell of the battery,

the maximum acceptable power associated with the selected cell being computed by taking a minimum of at least three values, including a first power, a second power, and a third power,

wherein the first power is calculated such that the selected cell does not exceed a constant threshold voltage,

wherein the second power is calculated such that metal deposits are not formed on a negative electrode of the selected cell based on a first operating threshold, and

wherein the third power is calculated such that the metal deposits are not formed on the negative electrode of the selected cell based on a second operating threshold that is different than the first operating threshold.

2. The regulation method as claimed in claim 1, wherein, an internal resistance value of the selected cell, which is read in a mapping as a function of a state of charge and of a temperature, is used to compute the first and the second powers.

3. The method as claimed in claim 2, wherein the battery includes a number of cells, including the selected cell, and the maximum acceptable power associated with each cell of the number of cells is computed, and a maximum power acceptable by the battery is computed by multiplying a minimum of the maximum acceptable power associated with each cell by the number of cells.

4. An electrical power supply system for a motor vehicle, comprising:

an electrical accumulation battery, the battery including one or more cells, the battery including an ammeter configured to measure current passing through the battery, and at least one voltmeter, each voltmeter of the at least one voltmeter being configured to measure voltage at terminals of a corresponding cell of the one or more cells;

an electronic control unit configured to deliver a maximum power that can be accepted by the battery during a recharging phase,

wherein the control unit is configured to compute a maximum power that can be accepted by a selected cell of the one or more cells, the maximum power that can be accepted by the battery being a multiple of the maximum power that can be accepted by the selected cell,

wherein the control unit computes the maximum power that can be accepted by the selected cell by taking a minimum of at least three values, including a first power, a second power, and a third power,

wherein the first power is calculated by the control unit such that the selected cell does not exceed a constant threshold voltage,

wherein the second power is calculated by the control unit such that metal deposits are not formed on a negative electrode of the selected cell based on a first operating threshold, and

wherein the third power is calculated by the control unit such that the metal deposits are not formed on the negative electrode of the selected cell based on a second operating threshold that is different than the first operating threshold.

5. The electrical power supply system as claimed in claim 4, wherein the first power is a product of a first linear function relative to the battery current and relative to the voltage at the terminals of the selected cell, and a second linear function relative to the battery current and relative to the voltage at the terminals of the selected cell.

6. The electrical power supply system as claimed in claim 5, wherein the second power is the product of a first constant threshold voltage by the sum of the battery current and of a term which is a function of the voltage at the terminals of the selected cell.

7. The power supply system as claimed in claim 5, wherein the control unit comprises a state-of-charge computer configured to compute a state of charge of the selected cell, and comprises a mapping that makes it possible to read, from a temperature and from the state of charge of the selected cell, an internal resistance of the selected cell, a term being added to the battery current for computation of the first power being inversely proportional to the internal resistance of the selected cell, and coefficients of the first and of the second linear function being functions of the internal resistance of the selected cell.

8. The power supply system as claimed in claim 7, wherein the second power is the product of a first constant threshold voltage by the sum of the battery current and of a quotient in which the difference between the first threshold voltage and the voltage at the terminals of the selected cell is divided by the internal resistance of the selected cell.

9. The power supply system as claimed in claim 8, wherein a value of the internal resistance of the selected cell is replaced, for the computation of the first power, by a secured internal resistance value obtained by multiplying the resistance derived from the mapping by a safety coefficient strictly greater than 1.

10. The power supply system as claimed in claim 7, wherein the first power is the product:

of the inverse of the square of the sum of the internal resistance of the selected cell and of a constant positive slope factor;

of the battery current multiplied by the internal resistance of the selected cell, to which is added a second threshold voltage and from which is subtracted the voltage at the terminals of the selected cell;

of the second threshold voltage multiplied by the resistance of the selected cell, a term to which is added the voltage at the terminals of the selected cell multiplied by the slope factor and from which is subtracted the battery current multiplied by the internal resistance of the selected cell and multiplied by the slope factor.

11. The power supply system as claimed in claim 10, wherein the internal resistance value of the selected cell is replaced, for the computation of the first power, by a secured internal resistance value obtained by multiplying the resistance derived from the mapping by a second safety coefficient strictly greater than 1.

12. The power supply system as claimed in claim 11, wherein the third power is the product of the following three terms:

the inverse of the square of the sum of the internal resistance of the selected cell and of a second constant positive slope factor, different from the first slope factor;

the battery current multiplied by the internal resistance of the selected cell, to which is added a third threshold voltage and from which is subtracted the voltage at the terminals of the selected cell;

the third threshold voltage multiplied by the resistance of the selected cell, a term to which is added the voltage at the terminals of the selected cell multiplied by the second slope factor and from which is subtracted the battery current multiplied by the internal resistance of the selected cell and multiplied by the second slope factor.

13. The power supply system as claimed in claim 7, wherein the battery includes a number of temperature sensors, and wherein the electronic control unit is configured to read internal resistances of different cells of the one or more cells by using a temperature value which is a minimum value out of a plurality of temperatures obtained from different sensors.

14. The power supply system as claimed in claim 7, wherein the electronic control unit further comprises a second computer configured to compute the value of the internal resistance for each cell of the at least one cell as a function of the history of the current passing through the battery and of the history of the voltage measured at the terminals of each cell.

15. An electrical power supply system for a motor vehicle, comprising:

an electrical accumulation battery, the battery including one or more cells, the battery including an ammeter configured to measure current passing through the battery, and at least one voltmeter, each voltmeter of the at least one voltmeter being configured to measure voltage at terminals of a corresponding cell of the one or more cells;

an electronic control unit configured to deliver a maximum power that can be accepted by the battery during a recharging phase,

wherein the control unit is configured to compute a maximum power that can be accepted by a selected cell of the one or more cells, the maximum power that can be accepted by the battery being a multiple of the maximum power that can be accepted by the selected cell,

wherein the control unit computes the maximum power that can be accepted by the selected cell by taking a minimum of at least three values, including a first power, a second power, and a third power,

wherein the first power is calculated by the control unit as a product of a first linear function relative to the battery current and relative to the voltage at the terminals of the selected cell, and a second linear function relative to the battery current and relative to the voltage at the terminals of the selected cell,

wherein the second power is calculated by the control unit as product of a first constant threshold voltage by the sum of the battery current and of a term which is a function of the voltage at the terminals of the selected cell, and

wherein the third power is calculated by the control unit as a product of the following three terms;

the inverse of the square of the sum of the internal resistance of the selected cell and of a second constant positive slope factor;

the battery current multiplied by the internal resistance of the selected cell, to which is added a third threshold voltage and from which is subtracted the voltage at the terminals of the selected cell;

the third threshold voltage multiplied by the resistance of the selected cell, a term to which is added the voltage at the terminals of the selected cell multiplied by the second slope factor and from which is subtracted the battery current multiplied by the internal resistance of the selected cell and multiplied by the second slope factor.