Title:
METHOD FOR JUDGING SCATTERING OF BATTERY PACK AND BATTERY DEVICE
Document Type and Number:
Japanese Patent JP3870577
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To effectively cancel the scattering of SOC between unit cells, and at the same time to achieve the inexpensive configuration of a circuit for detecting the voltage of each unit cell.
SOLUTION: A number of unit cells 2 consisting of a lithium-based secondary battery are connected in series for composing a battery pack 3. A voltage detection circuit 4 is provided, where the circuit 4 consists of a differential amplifier 10 for detecting the voltage of each unit cell 2, a multiplexer 11, and an AD converter 12. In each unit cell 2, a discharge circuit 5 with a discharge resistor 15 is provided. A control device 7 detects the SOC of the entire battery pack 3 according to the detection of a current sensor 6, obtains the OCV of each unit cell 2 based on the voltage of each unit cell 2 at that time, obtains the SOC according to the OCV of each unit cell 2 when the change rate of the OCV of each unit cell 2 corresponding to the change of the SOC of the entire battery pack 3 exceeds a specific value, and judges scattering. The unit cell with a large scattering of the SOC is discharged for correcting the scattering.
Inventors:
Atsushi Imai
Hiroshi Tamura
Tetsuya Nagata
Hiroshi Tamura
Tetsuya Nagata
Application Number:
JP26003398A
Publication Date:
January 17, 2007
Filing Date:
September 14, 1998
Export Citation:
Assignee:
株式会社デンソー
International Classes:
H02J7/00; B60L3/00; B60L11/18; G01R31/36; H01M10/48; H02J7/02; (IPC1-7): H02J7/02; B60L3/00; B60L11/18; G01R31/36; H01M10/48; H02J7/00
Domestic Patent References:
| JP9023590A | ||||
| JP4347543A | ||||
| JP7255134A | ||||
| JP11185823A |
Attorney, Agent or Firm:
Tsuyoshi Sato