Method and system for controlling charge and discharge of battery

Patent metadata

Field	Value
Publication number	US-9365121-B2
Application number	US-201414264563-A
Country	US
Kind code	B2
Filing date	Apr 29, 2014
Priority date	Dec 12, 2013
Publication date	Jun 14, 2016
Grant date	Jun 14, 2016

Abstract

A method and system for controlling charge and discharge of a battery are provided. The method includes detecting a battery temperature using a temperature sensor and determining, by a controller, a state of charge (SOC) of the battery, a first maximum discharging power value, and a first maximum charging power value that correspond to the battery temperature. The controller selects a lowest SOC from among at least one SOC to use a maximum discharging power equal to the determined first maximum discharging power value and resets the first maximum charging power value to a second maximum charging power value that corresponds to the selected lowest SOC. Further, the controller is configured to perform a charge and a discharge of the battery with the reset second maximum charging power value at the detected battery temperature.

First claim

What is claimed is:

1. A method of controlling charge and discharge of a battery for a vehicle, comprising:
detecting, by a controller, a battery temperature using a temperature sensor;
determining, by the controller, a state of charge (SOC) of the battery, a first maximum discharging power value, and a first maximum charging power value that correspond to the battery temperature;
selecting, by the controller, a lowest SOC from among at least one SOC to use a maximum discharging power equal to the determined first maximum discharging power value;
resetting, by the controller, the first maximum charging power value to a second maximum charging power value that corresponds to the selected lowest SOC and maintaining the first maximum discharging power value that corresponds to the selected lowest SOC; and
performing, by the controller, a charge and a discharge of the battery with the reset second maximum charging power value at the detected battery temperature and the maintained first maximum discharging power value at the detected battery temperature.

2. The method of claim 1 , wherein the SOC of the battery, the first maximum discharging power value, and the first maximum charging power value that correspond to the battery temperature are determined, by the controller, using a discharging power map and a charging power map included in a battery management system (BMS).

3. The method of claim 1 , wherein the second maximum charging power value is greater than the first maximum charging power value.

4. The method of claim 1 , wherein an SOC that corresponds to the first maximum charging power value is greater than an SOC that corresponds to the second maximum charging power value.

5. A system for controlling charge and discharge of a battery for a vehicle, comprising:
a battery management system (BMS) configured to operate and manage the battery;
a temperature sensor configured to detect a temperature of the battery;
a controller configured to:
detect the battery temperature using the temperature sensor;
determine a state of charge (SOC) of the battery, a first maximum discharging power value, and a first maximum charging power value that correspond to the battery temperature;
select a lowest SOC from among at least one SOC to use a maximum discharging power equal to the determined first maximum discharging power value;
reset the first maximum charging power value to a second maximum charging power value that corresponds to the selected lowest SOC and maintain the first maximum discharging power value that corresponds to the selected lowest SOC; and

perform a charge and a discharge of the battery with the reset second maximum charging power value at the detected battery temperature and the maintained first maximum discharging power value at the detected battery temperature and based on information data included in the BMS.

6. The system of claim 5 , wherein the BMS includes a discharging power map and a charging power map to adjust the charge and the discharge of the battery.

7. The system of claim 6 , wherein the controller is configured to use data included in the discharging power map and the charging power map to determine the SOC of the battery, the first maximum discharging power value, and the first maximum charging power value that correspond to the battery temperature.

8. A non-transitory computer readable medium containing program instructions executed by a controller, the computer readable medium comprising:
program instructions that control a battery management system (BMS) to operate and manage the battery;
program instructions that control a temperature sensor to detect a temperature of the battery;
program instructions that detect the battery temperature using the temperature sensor;
program instructions that determine a state of charge (SOC) of the battery, a first maximum discharging power value, and a first maximum charging power value that correspond to the battery temperature;
program instructions that select a lowest SOC from among at least one SOC to use a maximum discharging power equal to the determined first maximum discharging power value;
program instructions that reset the first maximum charging power value to a second maximum charging power value that corresponds to the selected lowest SOC and maintain the first maximum discharging power value that corresponds to the selected lowest SOC; and
program instructions that perform a charge and a discharge of the battery with the reset second maximum charging power value at the detected battery temperature and the maintained first maximum discharging power value at the detected battery temperature and based on information data included in the BMS.

9. The non-transitory computer readable medium of claim 8 , wherein the BMS includes a discharging power map and a charging power map to adjust the charge and the discharge of the battery.

10. The non-transitory computer readable medium of claim 9 , further comprising:
program instructions that use data included in the discharging power map and the charging power map to determine the SOC of the battery, the first maximum discharging power value, and the first maximum charging power value that correspond to the battery temperature.

Assignees

• Hyundai Motor Co Ltd

Inventors

• Kim Jinwook
• Kim Suk Hyung

Classifications

• B60L58/14

  Preventing excessive discharging · CPC title

• H02J7/82

  Control of state of charge [SOC] · CPC title

• B60L2240/545

  Temperature · CPC title

• H01M10/4207

  for several batteries or cells simultaneously or sequentially · CPC title

• B60L3/0046

  relating to electric energy storage systems, e.g. batteries or capacitors · CPC title