Battery status detecting method and battery status detecting apparatus

• US 20090033292A1
• Filed: 04/16/2008
• Published: 02/05/2009
• Est. Priority Date: 07/30/2007
• Status: Active Grant

• Current Assignee: Mitsumi Electric Co., Ltd. (MinebeaMitsumi Inc.)
• Original Assignee: Mitsumi Electric Co., Ltd. (MinebeaMitsumi Inc.)
• Inventors: Majima, Yoshihide
• Granted Patent: US 8,378,638 B2
• Time in Patent Office: Days
• US Class Current: 320/153
• CPC Class Codes: G01R 31/374 with means for correcting the measurement for temperature or ageing
• CPC Class Codes: G01R 31/3842 combining voltage and current measurements

Abstract

A battery status detecting method for detecting a battery status of a secondary battery is disclosed. The method includes: an open circuit voltage correcting step of obtaining a temperature-corrected value of the open circuit voltage of the secondary battery according to the temperature of the secondary battery, based on first open circuit voltage characteristics indicating the relationship between the open circuit voltage and the temperature of the secondary battery; and a charge rate correcting step of obtaining a temperature-corrected value of the charge rate of the secondary battery according to the temperature-corrected value of the open circuit voltage obtained in the open circuit voltage correcting step, based on second open circuit voltage characteristics indicating the relationship between the open circuit voltage and the charge rate of the secondary battery.

Claims

1. A battery status detecting method for detecting a battery status of a secondary battery, the method comprising:

an open circuit voltage correcting step of obtaining a temperature-corrected value of an open circuit voltage of the secondary battery according to a temperature of the secondary battery, based on first open circuit voltage characteristics indicating a relationship between the open circuit voltage and the temperature of the secondary battery; and

a charge rate correcting step of obtaining a temperature-corrected value of a charge rate of the secondary battery according to the temperature-corrected value of the open circuit voltage obtained in the open circuit voltage correcting step, based on second open circuit voltage characteristics indicating a relationship between the open circuit voltage and the charge rate of the secondary battery.

2. The battery status detecting method as claimed in claim 1, further comprising:

an open circuit voltage measuring step of obtaining a measurement value of the open circuit voltage of the secondary battery; and

a measurement value correcting step of obtaining a measurement-corrected value of the open circuit voltage by correcting the measurement value according to the temperature of the secondary battery based on third open circuit voltage characteristics indicating a relationship between the measurement value of the open circuit voltage and the temperature of the secondary battery.

3. The battery status detecting method as claimed in claim 2, wherein:

the open circuit voltage correcting step includes obtaining the temperature-corrected value of the open circuit voltage by correcting the measurement-corrected value of the open circuit voltage obtained in the measurement value correcting step.

4. The battery status detecting method as claimed in claim 2, further comprising:

a temperature measuring step of measuring the temperature of the secondary battery;

wherein

the open circuit voltage correcting step includes correcting the measurement-corrected value of the open circuit voltage according to the temperature measured in the temperature measuring step; and

the measurement value correcting step involves correcting the measurement value of the open circuit voltage according to the temperature measured in the temperature measuring step.

5. A battery status detecting apparatus that detects a battery status of a secondary battery, the apparatus comprising:

a correction unit that corrects a charge rate of the secondary battery according to a temperature of the secondary battery based on first open circuit voltage characteristics indicating a relationship between an open circuit voltage and the temperature of the secondary battery and second open circuit voltage characteristics indicating a relationship between the open circuit voltage and the charge rate of the secondary battery.

6. The battery status detecting apparatus as claimed in claim 5, further comprising:

a status measuring unit that obtains a measurement value of a status of the secondary battery; and

a temperature measuring unit that obtains a measurement value of the temperature of the secondary battery, said temperature including an ambient temperature of the secondary battery which ambient temperature includes a temperature of the status measuring unit;

wherein

the correction unit corrects the measurement value of the status of the secondary battery obtained by the status measuring unit according to the measurement value of the temperature obtained by the temperature measuring unit.

7. The battery status detecting apparatus as claimed in claim 6, comprising:

an integrated circuit that integrates the status measuring unit and the temperature measuring unit.