APPARATUS FOR CONTROLLING BATTERY STATE OF CHARGE, SYSTEM HAVING APPARATUS FOR CONTROLLING BATTERY STATE OF CHARGE, AND METHOD FOR CONTROLLING BATTERY STATE OF CHARGE

• US 20180312073A1
• Filed: 07/20/2017
• Published: 11/01/2018
• Est. Priority Date: 04/26/2017
• Status: Active Grant

• Current Assignee: Hyundai Motor Company (Hyundai Motor Group), Kia Motors Corporation (Kia Corp.)
• Original Assignee: Hyundai Motor Company (Hyundai Motor Group), Kia Motors Corporation (Kia Corp.)
• Inventors: LEE, Seung Yoon, PARK, Gun Hyung, LEE, Kyu Il, KIM, Dae Jong
• Granted Patent: US 10,688,869 B2
• Time in Patent Office: Days
• CPC Class Codes: B60L 1/003 to auxiliary motors, e.g. for pumps, compressors
• CPC Class Codes: B60L 50/72 Constructional details of fuel cells specially adapted for electric vehicles
• CPC Class Codes: B60L 50/75 using propulsion power supplied by both fuel cells and batteries
• CPC Class Codes: B60L 58/12 responding to state of charge [SoC]
• CPC Class Codes: B60L 58/15 Preventing overcharging
• CPC Class Codes: B60L 58/40 for controlling a combination of batteries and fuel cells
• CPC Class Codes: H01M 10/44 Methods for charging or discharging circuits for charging H02J7/00
• CPC Class Codes: H01M 16/006 of fuel cells with rechargeable batteries
• CPC Class Codes: H01M 2220/20 Batteries in motive systems, e.g. vehicle, ship, plane
• CPC Class Codes: H01M 2250/20 Fuel cells in motive systems, e.g. vehicle, ship, plane
• CPC Class Codes: H01M 8/04089 of gaseous reactants
• CPC Class Codes: H01M 8/04626 of auxiliary devices, e.g. batteries, capacitors
• CPC Class Codes: H01M 8/04753 of fuel cell reactants
• CPC Class Codes: Y02E 60/50 Fuel cells
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/40 Application of hydrogen technology to transportation, e.g. using fuel cells

Abstract

A system for controlling a state of charge (SOC) of a battery includes a battery SOC control apparatus for controlling a revolution per minute (RPM) of an air blower based on the SOC of the battery and a number of charge/discharge cycles of the battery in a case where a vehicle is in a constant current driving state, and a memory device for storing the SOC of the battery calculated by the battery SOC control apparatus.

Claims

1. A system for controlling a state of charge (SOC) of a battery, comprising:

a battery SOC control apparatus for controlling a revolution per minute (RPM) of an air blower based on the SOC of the battery and a number of charge/discharge cycles of the battery in a case where a vehicle is in a constant current driving state; and

a memory device for storing the SOC of the battery calculated by the battery SOC control apparatus.

2. The system of claim 1, wherein the battery SOC control apparatus controls the RPM of the air blower such that the SOC of the battery reaches a target value of the SOC of the battery in a case where the vehicle is not in the constant current driving state.

3. The system of claim 2, wherein the case that the vehicle not being in the constant current driving state comprises a state in which a driver intends to accelerate or decelerate the vehicle.

4. The system of claim 2, wherein the battery SOC control apparatus:

increases the RPM of the air blower by a first compensation value when the calculated SOC of the battery is equal to or smaller than a first reference value;

sets the RPM of the air blower to a fixed second compensation value when the calculated SOC of the battery is greater than the first reference value and smaller than a second reference value; and

decreases the RPM of the air blower by a third compensation value when the calculated SOC of the battery is equal to or greater than the second reference value.

5. The system of claim 4, wherein the battery SOC control apparatus decreases the first compensation value and the second compensation value by a predetermined correction value when controlling the RPM of the air blower in a case where the number of charge/discharge cycles is equal to or greater than a predetermined number of cycles.

6. The system of claim 5, wherein the battery SOC control apparatus controls the RPM of the air blower by decreasing the first compensation value and the second compensation value by the predetermined correction value, and decreases the third compensation value and a fourth compensation value, which are decreased by the correction value, again by the correction value in the case where the constant current driving state is continuously maintained and the number of charge/discharge cycles is equal to or greater than the predetermined number of cycles.

7. The system of claim 5, wherein the battery SOC control apparatus increases the number of charge/discharge cycles by one (1) when the number of charge/discharge cycles is equal to or smaller than the predetermined number of cycles and continuously controls the SOC of the battery.

8. The system of claim 3, wherein the battery SOC control apparatus includes:

a driving state determination device for determining whether the vehicle is in the constant current driving state;

a battery SOC calculation device for calculating the SOC of the battery;

a battery SOC determination device for determining whether the SOC of the battery is within a predetermined range; and

an RPM control device for controlling the RPM of the air blower depending on a determined result by the battery SOC determination device and the number of charge/discharge cycles of the battery when the vehicle is in the constant current driving state.

9. The system of claim 8, wherein the RPM control device initializes the number of charge/discharge cycles and controls the RPM of the air blower depending on the determined result by the battery SOC determination device when the vehicle is not in the constant current driving state according to a determined result by the driving state determination device.

10. An apparatus for controlling a state of charge (SOC) of a battery, comprising:

a driving state determination device for determining whether a vehicle is in a constant current driving state;

a battery SOC calculation device for calculating the SOC of the battery;

a battery SOC determination device for determining whether the SOC of the battery is within a predetermined range; and

an RPM control device for controlling a revolution per minute (RPM) of an air blower depending on a determined result by the battery SOC determination device and a number of charge/discharge cycles of the battery when the vehicle is in the constant current driving state.

11. The apparatus of claim 10, wherein the battery SOC determination device compares the calculated SOC of the battery with a first reference value and a second reference value, the second reference value being greater than the first reference value, and determining whether the SOC of the battery is within the predetermined range.

12. The apparatus of claim 11, wherein the RPM control device:

increases the RPM of the air blower by a first compensation value when the calculated SOC of the battery is equal to or smaller than the first reference value;

sets the RPM of the air blower to a fixed second compensation value when the calculated SOC of the battery is greater than the first reference value and smaller than the second reference value; and

decreases the RPM of the air blower by a third compensation value when the calculated SOC of the battery is equal to or greater than the second reference value.

13. The apparatus of claim 12, wherein the RPM control device decreases the first compensation value and the second compensation value by a predetermined correction value when controlling the RPM of the air blower in a case that the number of charge/discharge cycles is equal to or greater than a predetermined number of cycles.

14. The apparatus of claim 13, wherein the RPM control device controls the RPM of the air blower by decreasing the first compensation value and the second compensation value by the predetermined correction value and decreases the third compensation value and a fourth compensation value, which are decreased by the correction value, again by the correction value in the case that the constant current driving state is continuously maintained and the number of charge/discharge cycles is equal to or greater than the predetermined number of cycles.

15. A method for controlling a state of charge (SOC) of a battery, comprising:

calculating the SOC of the battery;

setting a revolution per minute (RPM) of an air blower depending on the SOC of the battery; and

compensating for the RPM of the air blower based on a number of charge/discharge cycles of the battery when a vehicle is in a constant current driving state.

16. The method of claim 15, wherein the step of setting the RPM of the air blower depending on the SOC of the battery comprises:

increasing the RPM of the air blower by a first compensation value when the calculated SOC of the battery is equal to or less than a first reference value;

setting the RPM of the air blower to a fixed second compensation value when the calculated SOC of the battery is greater than the first reference value and less than a second reference value; and

decreasing the RPM of the air blower by a third compensation value when the calculated SOC of the battery is equal to or greater than the second reference value.

17. The method of claim 16, wherein the step of compensating for the RPM of the air blower comprises decreasing the first compensation value and the second compensation value by a predetermined correction value when controlling the RPM of the air blower in a case that the number of charge/discharge cycles is equal to or greater than a predetermined number of cycles.

18. The method of claim 17, wherein the RPM of the air blower is controlled by decreasing the first compensation value and the second compensation value by the predetermined correction value, and the third compensation value and a fourth compensation value, which are decreased by the correction value, decreased again by the correction value in the case that the constant current driving state is continuously maintained and the number of charge/discharge cycles is equal to or greater than the predetermined number of cycles.

19. The method of claim 18, further comprising determining whether the vehicle is in the constant current driving state.

20. The method of claim 19, further comprising, in a case that the vehicle is not in the constant current driving state:

initializing the number of charge/discharge cycles; and

controlling the RPM of the air blower depending on the SOC of the battery regardless of the number of charge/discharge cycles.