VOLTAGE MEASUREMENT DEVICE, VOLTAGE MEASUREMENT SYSTEM AND VOLTAGE MEASUREMENT METHOD

• US 20140009165A1
• Filed: 03/21/2012
• Published: 01/09/2014
• Est. Priority Date: 03/24/2011
• Status: Abandoned Application

• Current Assignee: Toshiba It&Control Systems Corporation (Toshiba Corporation), Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toshiba It&Control Systems Corporation (Toshiba Corporation), Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Miyazaki, Motoki, Miyata, Akira
• Application Number:
  US14/006,207
• Publication Number:
  US 20140009165A1
• Time in Patent Office: Days
• US Class Current: 324/434
• CPC Class Codes: G01R 31/367 Software therefor, e.g. for battery testing using modelling or look-up tables
• 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: G01R 31/396 Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery

Abstract

A voltage measurement device that measures battery voltages of a plurality of single batteries connected in series has: a first voltage detection unit that detects the battery voltages; a storage unit that stores error information relating to a detection error between a voltage detected by the first voltage detection unit and a voltage detected by a second voltage detection unit of higher detection precision but lower detection speed than the first voltage detection unit; and a correction unit that, on the basis of the error information stored in the storage unit, corrects the battery voltages detected by the first voltage detection unit.

Claims

1. A voltage measurement device that measures battery voltages of a plurality of single batteries connected in series, comprising:

a first voltage detection unit that detects the battery voltages;

a storage unit that stores error information relating to a detection error between a voltage detected by the first voltage detection unit and a voltage detected by a second voltage detection unit of higher detection precision but lower detection speed than the first voltage detection unit; and

a correction unit that, on the basis of the error information stored in the storage unit, corrects the battery voltages detected by the first voltage detection unit.

2. The voltage measurement device according to claim 1, wherein the detection error is a voltage difference obtained when the first voltage detection unit and the second voltage detection unit respectively detect a voltage of a reference power source.

3. The voltage measurement device according to claim 1, wherein

the first voltage detection unit includes a plurality of differential amplifiers provided so as to correspond to the single batteries, and

each of the differential amplifiers acquires each of the battery voltages at an identical timing.

4. The voltage measurement device according to claim 3, further comprising:

an averaging processing unit that averages respective battery voltages consecutively outputted from the differential amplifiers,

wherein the correction unit corrects, on the basis of the error information, the battery voltages averaged by the averaging processing unit.

5. The voltage measurement device according to claim 1, wherein the detection precision of the first voltage detection unit fluctuates with temperature.

6. A voltage measurement system that measures battery voltages of a plurality of single batteries connected in series, comprising:

a reference power source;

a first voltage detection unit that detects the battery voltages;

a second voltage detection unit of higher detection precision but lower detection speed than the first voltage detection unit;

a storage unit that stores, as error information, a voltage difference obtained when the first voltage detection unit and the second voltage detection unit respectively detect a voltage of the reference power source; and

a correction unit that, on the basis of the error information stored in the storage unit, corrects the battery voltages detected by the first voltage detection unit.

7. A voltage measurement method, comprising:

measuring a voltage of a reference power source, using a first voltage detection unit;

measuring a voltage of the reference power source, using a second voltage detection unit of higher detection precision but lower detection speed than the first voltage detection unit;

storing in a storage unit, as error information, a difference between the voltage of the reference power source measured by the first voltage detection unit and the voltage of the reference power source measured by the second voltage detection unit;

concurrently measuring battery voltages of a plurality of single batteries connected in series, using the first voltage detection unit; and

correcting, on the basis of the error information stored in the storage unit, the battery voltages measured by the first voltage detection unit.