SYSTEM AND METHOD FOR LIMITING POWER OF BATTERY

• US 20150006933A1
• Filed: 10/03/2013
• Published: 01/01/2015
• Est. Priority Date: 06/28/2013
• Status: Abandoned Application

• Current Assignee: Hyundai Motor Company (Hyundai Motor Group), Kia Motors Corporation (Hyundai Motor Group)
• Original Assignee: Hyundai Motor Company (Hyundai Motor Group), Kia Motors Corporation (Hyundai Motor Group)
• Inventors: Park, Hyun Soo, Kim, Woo Sung
• Application Number:
  US14/045,119
• Publication Number:
  US 20150006933A1
• Time in Patent Office: Days
• US Class Current: 713/323
• CPC Class Codes: B60L 2240/545 Temperature
• CPC Class Codes: B60L 2240/547 Voltage
• CPC Class Codes: B60L 3/12 Recording operating variables ; Monitoring of operating variables
• CPC Class Codes: B60L 58/13 Maintaining the SoC within a determined range
• CPC Class Codes: B60L 58/14 Preventing excessive discharging
• CPC Class Codes: B60L 58/15 Preventing overcharging
• CPC Class Codes: B60L 58/25 by controlling the electric load
• CPC Class Codes: H01M 10/443 in response to temperature
• CPC Class Codes: H01M 10/48 Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569
• CPC Class Codes: H01M 10/486 for measuring temperature
• CPC Class Codes: H01M 50/581 in response to temperature
• 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

A system and method for limiting power of a battery in which a minimum discharging voltage reference value and a slew rate for discharging power are prepared per temperature section and the slew rates for discharging power are applied differently according to temperatures. The method includes measuring, by a sensor, temperature of a battery and measuring, by a controller, a minimum voltage of a battery cell. The controller is configured to adjust a discharging limitation by reducing the discharging power limitation value by the slew rate for discharging power at a corresponding temperature section when the minimum voltage of a battery cell is less than the minimum discharging voltage reference value at the corresponding temperature section.

Claims

1. A method for limiting power of a battery in which a minimum discharging voltage reference value and a slew rate for discharging power are prepared per temperature section and the slew rates for discharging power are applied differently according to temperatures, comprising:

measuring, by a sensor, a temperature of a battery;

measuring, by a controller, a minimum voltage of a battery cell; and

adjusting, by the controller, a discharging limitation by reducing the discharging power limitation value by the slew rate for discharging power at a corresponding temperature section when the minimum voltage of a battery cell is less than the minimum discharging voltage reference value at the corresponding temperature section.

2. The method for limiting power of a battery of claim 1, further comprising:

cutting-off, by the controller, the discharging power limitation value to about 0 when the discharging power limitation value of a battery is decreased by the slew rate for discharging power at the corresponding temperature section, causing the discharging power limitation value to be less than about 0.

3. A method for limiting power of a battery in which a maximum charging voltage reference value and a slew rate for charging power are prepared per temperature section and the slew rates for charging power are applied differently according to temperatures, comprising:

measuring, by a sensor, a temperature of a battery;

measuring, by a controller, a maximum voltage of a battery cell; and

adjusting, by the controller, a charging limitation by reducing the charging power limitation value by the slew rate for charging power at a corresponding temperature section when the maximum voltage of a battery cell is greater than the maximum charging voltage reference value at the corresponding temperature section.

4. The method for limiting power of a battery of claim 3, further comprising:

cutting-off, by the controller, the charging power limitation value to about 0 when the charging power limitation value of a battery is decreased by the slew rate for charging power at the corresponding temperature section, causing the charging power limitation value to be less than about 0.

5. A method for limiting power of a battery in which a maximum discharging voltage reference value and a slew rate for discharging power are prepared per temperature section and the slew rates for discharging power are applied differently according to temperatures, comprising:

measuring, by a sensor, a temperature of a battery;

measuring, by a controller, a minimum voltage of a battery cell; and

adjusting, by the controller, a discharging limitation by increasing the discharging power limitation value by the slew rate for discharging power at a corresponding temperature section when the minimum voltage of a battery cell is greater than the maximum discharging voltage reference value at the corresponding temperature section.

6. A method for limiting power of a battery in which a minimum charging voltage reference value and a slew rate for charging power are prepared per temperature section and the slew rates for charging power are applied differently according to temperatures, comprising:

measuring, by a sensor, a temperature of a battery;

measuring, by a controller, a maximum voltage of a battery cell; and

adjusting, by the controller, a charging limitation by increasing the charging power limitation value by the slew rate for charging power at a corresponding temperature section when the maximum voltage of a battery cell is less than the minimum charging voltage reference value at the corresponding temperature section.

7. A method for limiting power of a battery, wherein a slew rate for discharging power and a slew rate for charging power are set per temperature section, and when a discharging power limitation value or a charging power limitation value of a battery is to be decreased, the slew rate for discharging power or the slew rate for charging power at the corresponding temperature section is applied to decrease the discharging power limitation value or the charging power limitation value in stages.

8. A method for limiting power of a battery, wherein a slew rate for discharging power and a slew rate for charging power are set per temperature section, and when a discharging power limitation value or a charging power limitation value of a battery needs to be increased, the slew rate for discharging power or the slew rate for charging power at the corresponding temperature section is applied to increase the discharging power limitation value or the charging power limitation value in stages.

9. A system for liming power of a battery, in which a minimum discharging voltage reference value and a slew rate for discharging power are prepared per temperature section and the slew rates for discharging power are applied differently according to temperatures, comprising:

a controller includes a memory and a processor, the memory configured to store program instructions and the processor configured to execute the program instructions, the program instructions when executed configured to;

control a sensor to measure a temperature of a battery;

measure a minimum voltage of a battery cell; and

adjust a discharging limitation by reducing the discharging power limitation value by the slew rate for discharging power at a corresponding temperature section when the minimum voltage of a battery cell is less than the minimum discharging voltage reference value at the corresponding temperature section.

10. The system of claim 9, wherein the program instructions when executed are further configured to:

cut-off the discharging power limitation value to about 0 when the discharging power limitation value of a battery is decreased by the slew rate for discharging power at the corresponding temperature section, causing the discharging power limitation value to be less than about 0.

11. A non-transitory computer readable medium containing program instructions executed by a controller, the computer readable medium comprising:

program instructions that control a sensor to measure a temperature of a battery;

program instructions that measure a minimum voltage of a battery cell; and

program instructions that adjust a discharging limitation by reducing the discharging power limitation value by the slew rate for discharging power at a corresponding temperature section when the minimum voltage of a battery cell is less than the minimum discharging voltage reference value at the corresponding temperature section.

12. The non-transitory computer readable medium of claim 11, further comprising:

program instructions that cut-off the discharging power limitation value to about 0 when the discharging power limitation value of a battery is decreased by the slew rate for discharging power at the corresponding temperature section, causing the discharging power limitation value to be less than about 0.