METHOD FOR DETERMINING A CHARGE ACCEPTANCE, AND METHOD FOR CHARGING A RECHARGEABLE BATTERY

• US 20130020994A1
• Filed: 07/20/2012
• Published: 01/24/2013
• Est. Priority Date: 07/20/2011
• Status: Active Grant

• Current Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Original Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Inventors: Christen, Urs, Karden, Eckhard, Romano, Paolo
• Granted Patent: US 9,499,066 B2
• Time in Patent Office: Days
• US Class Current: 320/109
• CPC Class Codes: B60L 58/12 responding to state of charge [SoC]
• CPC Class Codes: B60L 58/21 having the same nominal voltage
• CPC Class Codes: H01M 10/441 for several batteries or cells simultaneously or sequentially
• CPC Class Codes: H01M 2220/20 Batteries in motive systems, e.g. vehicle, ship, plane
• CPC Class Codes: H02J 7/00302 Overcharge protection
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

In the case of a method for determining a charge acceptance I_CA of a rechargeable battery, the battery is computationally split up into a predetermined number n of compartments i having a respective maximum charge capacitance C_i, which are connected in parallel via resistances R_i, and the charge acceptance I_CA of the battery is determined on the basis of the charge capacitance C₁ and the resistance R₁ of the compartment adjacent to the battery terminals. The invention also relates to a method for charging a rechargeable battery.

Claims

1. A method for determining a charge acceptance I_CA of a rechargeable battery,

wherein

the battery is computationally split up into a predetermined number n of compartments i having a respective maximum charge capacitance C_i, which are connected in parallel via resistances R_i, and the charge acceptance I_CA of the battery is determined on the basis of the charge capacitance C₁ and the resistance R₁ of the compartment adjacent to the battery terminals.

2. The method as claimed in claim 1,

wherein

the battery is a lead-acid battery.

3. The method as claimed in claim 1,

wherein

the charge acceptance I_CA of the battery is determined by taking account of the charge capacitances C_i and the resistances R_i of further compartments i, in particular all the compartments i, i=1, . . . , n.

4. The method as claimed in claim 3,

wherein

an average charge acceptance I_CA,avg is determined.

5. The method as claimed in claim 4,

wherein

the compartments i are selected in such a way that the charge capacitances C_i increase exponentially with the index i.

6. The method as claimed in claim 5,

wherein

at least one of the instantaneous state of charge SOC, the instantaneous charge capacity SOH, a measured battery voltage U_batt,meas, and a temperature θ

of the battery is taken into account.

7. The method as claimed in claim 6,

wherein

respectively a first resistance value R_ci is taken into account during charging, and a second resistance value R_di is taken into account during discharging of the battery.

8. A method for charging a rechargeable battery,

wherein

a charge acceptance I_CA of the battery is determined using the method of claim 7, and a charging current and/or a charging voltage is regulated in such a way that the charging current does not exceed the charge acceptance I_CA of the battery.

9. An efficient battery monitoring and charging system for a motor vehicle,

comprising

a control unit that determines a charge acceptance I_CA of a rechargeable battery, wherein the control unit computationally splits the battery up into a predetermined number n compartments i having a respective maximum charge capacitance C_i, which are connected in parallel via resistances R_i, and the charge acceptance I_CA of the battery is determined on the basis of the charge capacitance C₁ and the resistance R₁ of the compartment adjacent to the battery terminals;

and

wherein

the vehicle charges the battery based on the determined charge acceptance I_CA by choosing to operate the generator during braking or to start the internal combustion engine of the motor vehicle.

10. The system as claimed in claim 9,

wherein

the charge acceptance I_CA of the battery is determined by taking account of the charge capacitances C_i and the resistances R_i of further compartments i, in particular all the compartments i, i=1, . . . , n.

11. The system as claimed in claim 10,

wherein

an average charge acceptance I_CA,avg is determined.

12. The system as claimed in claim 11,

wherein

the compartments i are selected in such a way that the charge capacitances C_i increase exponentially with the index i.

13. The system as claimed in claim 12,

wherein

at least one of the instantaneous state of charge SOC, the instantaneous charge capacity SOH, a measured battery voltage U_batt,meas, and a temperature θ

of the battery is taken into account.

14. The system as claimed in claim 13,

wherein

respectively a first resistance value R_ci is taken into account during charging, and a second resistance value R_di is taken into account during discharging of the battery.

15. The system as claimed in claim 14,

wherein

a charging current and/or a charging voltage is regulated in such a way that the charging current does not exceed the charge acceptance I_CA of the battery.

16. The system as claimed in claim 15,

wherein

the motor vehicle is a hybrid vehicle or a micro-hybrid vehicle with regenerative braking and automatic start-stop systems.