Battery management system (BMS) and driving method thereof

• US 7,634,369 B2
• Filed: 08/01/2007
• Issued: 12/15/2009
• Est. Priority Date: 10/12/2006
• Status: Expired due to Fees

• Current Assignee: Samsung SDI Company Limited
• Original Assignee: Samsung SDI Company Limited
• Inventors: Choi, Soo-Seok, Park, Ho-Young, Lee, Young-Jo, Kim, Beom-Gyu, Seo, Se-Wook, Lim, Gye-Jong, Yun, Han-Seok, Tae, Yong-Jun
• Primary Examiner(s): Bui; Bryan
• Application Number:
  US11/882,464
• Publication Number:
  US 20080091363A1
• Time in Patent Office: 867 Days
• Field of Search: 702/63, 702/64, 702/65, 324/426, 324/428, 324/430, 320/130, 320/132, 320/134
• US Class Current: 702/63
• CPC Class Codes: H02J 7/0029 with safety or protection devices or circuits
• CPC Class Codes: H02J 7/00302 Overcharge protection
• CPC Class Codes: H02J 7/00304 Overcurrent protection
• CPC Class Codes: H02J 7/00306 Overdischarge protection
• CPC Class Codes: H02J 7/00309 Overheat or overtemperature protection
• 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: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

A Battery Management System (BMS) and a battery management method include a sensing unit to measure a battery terminal voltage, current, and temperature, and a Main Control Unit (MCU) to compare the measured battery terminal voltage, current, and temperature to a State of Charge (SOC) reset condition and to reset a battery estimate SOC according to the comparison result. The MCU resets the battery estimate SOC to a first reset SOC when the SOC reset condition corresponds to a first SOC and reset the battery estimate SOC at a second reset SOC when the SOC reset condition corresponds to a second SOC.

Claims

1. A Battery Management System (BMS) to managing a battery, the BMS comprising:

a sensing unit to measure a battery terminal voltage, current, and temperature; and

a Main Control Unit (MCU) to compare the measured battery terminal voltage, current, and temperature to a State of Charge (SOC) reset condition and to reset a battery estimate SOC according to the comparison result;

wherein the MCU resets the battery estimate SOC to a first reset SOC in response to the SOC reset condition corresponding to a first SOC and resets the battery estimate SOC to a second reset SOC in response to the SOC reset condition corresponding to a second SOC.

2. The BMS of claim 1, wherein the first reset SOC is different from the first SOC and compensates for a reset estimate error to the first SOC, the reset estimate error occurring in the SOC reset condition corresponding to the first SOC.

3. The BMS of claim 1, wherein the second reset SOC is different from the second SOC and compensates for a reset estimate error to the second SOC, the reset estimate error occurring in the SOC reset condition corresponding to the second SOC.

4. The BMS of claim 3, wherein the first SOC is a minimum value within an overcharge threshold range of the battery.

5. The BMS of claim 4, wherein the second SOC is a maximum value within an overcharge threshold range of the battery.

6. A method of managing a battery by driving a Battery Management System (BMS) to reset a battery estimate State of Charge (SOC), the method comprising:

measuring, using a sensing unit, a battery terminal voltage, current, and temperature and comparing the measured battery terminal voltage, current, and temperature to said SOC reset condition;

resetting, using a Main Control Unit (MCU), the battery estimate SOC to a first reset SOC when the SOC reset condition corresponds to a first SOC; and

resetting, using said MCU the battery estimate SOC to a second reset SOC when the SOC reset condition corresponds to a second SOC.

7. The method of claim 6, wherein the first reset SOC is different from the first SOC and compensates for a reset estimate error to the first SOC, the reset estimate error occurring in the SOC reset condition corresponding to the first SOC.

8. The method of claim 6, wherein the second reset SOC is different from the second SOC and compensates for a reset estimate error to the second SOC, the reset estimate error occurring in the SOC reset condition corresponding to the second SOC.

9. The method of claim 8, wherein the first SOC is a minimum value within an overcharge threshold range of the battery.

10. The method of claim 9, wherein the second SOC is a maximum value within an overcharge threshold range of the battery.