Method of setting initial value of SOC of battery using OCV hysteresis depending on temperatures

• US 20060202663A1
• Filed: 03/08/2006
• Published: 09/14/2006
• Est. Priority Date: 03/09/2005
• Status: Abandoned Application

• Current Assignee: LG Chem Limited (LG Corporation)
• Original Assignee: LG Chem Limited (LG Corporation)
• Inventors: Kim, Do Youn, Cho, Il
• Application Number:
  US11/370,403
• Publication Number:
  US 20060202663A1
• Time in Patent Office: Days
• US Class Current: 320/132
• CPC Class Codes: G01R 31/374 with means for correcting the measurement for temperature or ageing
• CPC Class Codes: G01R 31/3835 involving only voltage measurements
• CPC Class Codes: H01M 10/42 Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells H01M10/60 takes precedence
• CPC Class Codes: H01M 10/425 Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing printed circuits H05K1/00
• CPC Class Codes: H01M 10/4285 Testing apparatus
• CPC Class Codes: H01M 2200/00 Safety devices for primary or secondary batteries
• 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

Disclosed is a method of setting an initial value of a SOC of a battery more accurately in consideration of an open circuit voltage (OCV) variation depending on temperatures and aging. The method comprises steps of experimentally measuring open circuit voltage (OCV) values under various temperatures; structuring a table correlating the measured OCV values and SOC values of the battery classified by on the temperatures; storing the table in a battery management system (BMS); measuring current temperature and OCV value with the BMS; obtaining a SOC value of the battery corresponding to the measured values by referring to the table; and setting the obtained value as an initial SOC value of the battery.

Claims

1. A method of setting an initial value of a SOC of a battery comprising steps of:

experimentally measuring open circuit voltage (OCV) values under various temperatures;

structuring a table correlating the measured OCV values and SOC values of the battery classified by the temperatures;

storing the table in a battery management system (BMS);

measuring current temperature and OCV value with the BMS;

obtaining a SOC value of the battery corresponding to the measured values by referring to the table; and

setting the obtained value as an initial SOC value of the battery.

2. The method according to claim 1, further comprising a step of resetting the SOC of the battery using the OCV values according to the various temperatures.

3. The method according to claim 1, wherein the table has a horizontal axis in which the temperatures are divided in a unit of 5°

C. between −

30°

C. and +45°

C. and a vertical axis in which the SOC is divided in a unit of 1% between 0 and 100%.

4. The method according to claim 2, wherein the table has a horizontal axis in which the temperatures are divided in a unit of 5°

C. between −

30°

C. and +45°

C. and a vertical axis in which the SOC is divided in a unit of 1% between 0 and 100%.

5. The method according to claim 1, further comprising a step of resetting approximating the obtained value by a bilinear interpolation.

6. The method according to claim 2, wherein the table has a horizontal axis in which the temperatures are divided in a unit of 5°

C. between −

30°

C. and +45°

C. and a vertical axis in which the SOC is divided in a unit of 1% between 0 and 100%.