Method for determining cell number, cell number determination device, power supply device and program

• US 8,604,797 B2
• Filed: 03/25/2010
• Issued: 12/10/2013
• Est. Priority Date: 03/27/2009
• Status: Active Grant

• Current Assignee: TDK Corporation, Tdk-Lambda Corporation (TDK Corporation)
• Original Assignee: TDK Corporation, Tdk-Lambda Corporation (TDK Corporation)
• Inventors: Senriuchi, Tadao, Hirokawa, Masahiko, Sakamoto, Takumi, Nakazawa, Hiroshi, Hirao, Noriyuki
• Primary Examiner(s): Koval, Melissa
• Assistant Examiner(s): MILLER, DANIEL R
• Application Number:
  US12/659,949
• Publication Number:
  US 20100259270A1
• Time in Patent Office: 1,356 Days
• Field of Search: None
• US Class Current: 324/429
• CPC Class Codes: G01R 19/16542 for batteries charge condition monitoring in G01R31/36
• 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
• CPC Class Codes: H01G 11/10 Multiple hybrid or EDL capacitors, e.g. arrays or modules housings, cases, encapsulations or mountings thereof H01G11/78
• CPC Class Codes: H01G 11/14 Arrangements or processes for adjusting or protecting hybrid or EDL capacitors emergency protective circuit arrangements specially adapted for capacitors, and effecting automatic switching in the event of an undesired change from normal working conditions H02H7/16; emergency protective circuit arrangements for limiting excess current or voltages without disconnection H02H9/00
• CPC Class Codes: H01M 10/4207 for several batteries or cells simultaneously or sequentially
• CPC Class Codes: H01M 10/482 for several batteries or cells simultaneously or sequentially
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02E 60/13 Energy storage using capacitors

Abstract

A number of cells can be determined before control for a battery without providing cell number setting and input means. The cell number determination device comprises voltage measuring units that select an “i”th cell among cells that are connected in series and that configure a battery, and that measure a voltage value between a terminal in which the “i”th cell and an (i−1)th cell, which is in one location higher than the “i”th cell, are connected and a ground potential line, voltage comparators that determine an existence, nonexistence or normality of the cells by comparing a voltage value of an (i+1)th cell that is in one location lower than the “i”th cell with the voltage value of the “i”th cell measured by the voltage measuring units and a cell number determination unit that determines a number of assembled cells and normal cells and cell assembled locations in the battery.

Claims

1. A cell number determination device comprising:

a voltage measuring unit that selects an i^th cell, where i is an integer from 1 to N, among a number N of cells that are connected in series and that configures a battery, and that measures a voltage value between a terminal in which the i^th cell and (i−

1)^th cell, which is in one location higher than the i^th cell, are connected and a ground potential line;

a voltage comparator that determines whether the i^th cell exists normally or not by comparing a voltage value of an (i+1)^th cell that is in one location lower than the i^th cell with the voltage value of the i^th cell measured by the voltage measuring unit; and

a cell number determination unit that determines a number of assembled cells and normal cells and cell assembled locations in the overall battery based on a comparison result of the voltage comparator,

wherein

the cell number determination unit determines whether or not the cells that the voltage comparator determined to be existing normally are continuous, and

when at least one of the N cells is determined not to exist normally, and the cell number determination unit determines that the number of cells that are existing normally are continuous, the cell number determination unit determines number of assembled cells to be the number of continuous cells that are existing normally.

2. The cell number determination device according to claim 1, wherein

when the cell in which one terminal is connected to the ground potential line is a bottom-level N^th cell, the cell number determination unit instructs the voltage measuring unit to measure a voltage between a terminal in which the N^th cell and the (N−

1)^th cell that is in one location higher than the N^th cell are connected and the ground potential line,

when a voltage difference between a measurement result by the voltage measuring unit and the ground potential line is equal to or less than a predetermined threshold value, or is less than the predetermined threshold value, the cell number determination unit instructs the voltage comparator to determine that the N^th cell is not assembled or has failed to operate properly even though the N^th cell is assembled,

the cell number determination unit instructs the voltage measuring unit to measure a voltage between a terminal in which the (N−

1)^th cell and an (N−

2)^th cell that is in one location higher than the (N−

1)^th cell are connected and the ground potential line,

when a voltage difference between a measurement result by the voltage measuring unit and the measurement result of the voltage value of the N^th cell is equal to or less than a predetermined threshold value, or is less than the predetermined threshold value, the cell number determination unit instructs the voltage comparator to determine that the (N−

1)^th cell is not assembled or has failed to operate properly even though the (N−

1)^th cell is assembled, and

the total number of assembled cells, the number of normally existing cells, and the cell assembled locations of the normally existing cells in the overall battery are determined based on a result that is obtained by repeatedly executing the processing by the voltage measuring unit and the voltage comparator, until an upper-level first cell is reached.

3. The cell number determination device according to claim 2, wherein

the voltage measuring unit is a single voltage measuring unit and the voltage comparator is a single voltage comparator,

a selector switch that connects the N number of the terminals that are target for measurement for N number of the cells and the single voltage measuring unit through sequentially switching is provided, and

the single voltage comparator stores and compares a previous measurement result with a latest measurement result among measurement results of the cells that are sequentially output from the voltage measuring unit in accordance with switching the selector switch.

4. A power supply device comprising:

the cell number determination device according to claim 1; and

a battery with a plurality of cells, wherein

the cell number determination unit determines the number of assembled cells and normal cells and cell assembled locations in the battery as power-on is a trigger.

5. The power supply device according to claim 4, wherein

when all determination results in which determinations are performed several times are the same, the cell number determination unit determines that the determination result is correct.

6. A power supply device comprising:

the cell number determination device according to claim 2; and

a battery with a plurality of cells, wherein

the cell number determination unit determines the number of assembled cells and normal cells and cell assembled locations in the battery as power-on is a trigger.

7. The power supply device according to claim 6, wherein

when all determination results in which determinations are performed several times are the same, the cell number determination unit determines that the determination result is correct.

8. A power supply device comprising:

the cell number determination device according to claim 3; and

a battery with a plurality of cells, wherein

the cell number determination unit determines a number of assembled cells and normal cells and cell assembled locations in the battery as power-on is a trigger.

9. The power supply device according to claim 8, wherein

when all determination results in which determinations are performed several times are the same, the cell number determination unit determines that the determination result is correct.

10. The cell number determination device according to claim 1, wherein

the voltage comparator also determines normality or abnormality of the cells by comparing the voltage value of the (i+1)^th cell that is in one location lower than the i^th cell with the voltage value of the i^th cell measured by the voltage measuring unit.

11. The cell number determination device according to claim 1, wherein

the N cells are each single-cell lithium cells.

12. A method for determining a cell number that is executed by a cell number determination device for determining a number of assembled cells and normal cells, and cell assembled locations in a battery configured with a plurality of cells, comprising:

executing a voltage measuring step that selects an i^th cell, where i is an integer from 1 to N, among a number N of cells that are connected in series and that configure the battery, and that measures a voltage value between a terminal in which the i^th cell and an (i−

1)^th cell that is in one location higher than the i^th cell are connected and a ground potential line;

executing a voltage comparison step that determines whether the i^th cell exists normally or not by comparing a voltage value of an (i+1)^th cell that is in one location lower than the i^th cell with the voltage value of the i^th cell measured by the voltage measuring unit; and

executing a cell number determination step that determines a total number of assembled cells, a number of normally existing cells, and cell assembled locations of the normally existing cells in the overall battery based on a comparison result of a voltage comparator through a cell number determination unit of the cell number determination device,

wherein

the voltage comparison step determines whether or not the cells that the voltage comparator determined to be existing normally are continuous, and

when at least one of the N cells is determined not to exist normally, and the cell number determination step determines that the number of cells that are existing normally are continuous, the cell number determination step determines number of assembled cells to be the number of continuous cells that are existing normally.

13. The method for determining a cell number according to claim 12, wherein

as processing of a cell number determination step executed by the cell number determination unit,

when the cell in which one terminal is connected to the ground potential line is a bottom-level N^th cell, the cell number determination unit executes the voltage measuring step to measure a voltage between a terminal in which the N^th cell and the (N−

1)^th cell that is in one location higher than the N^th cell are connected and the ground potential line,

when a voltage difference between a measurement result by the voltage measuring step and the ground potential line is equal to or less than a predetermined threshold value, or is less than the predetermined threshold value, the cell number determination unit executes the voltage comparator step to determine that the N^th cell is not assembled or has failed to operate properly even though the N^th cell is assembled,

the cell number determination unit executes the voltage measuring step to measure a voltage between a terminal in which the (N−

1)^th cell and an (N−

2)^th cell that is in one location higher than the (N−

1)^th cell are connected and the ground potential line,

when a voltage difference between a measurement result by the voltage measuring step and the measurement result of the voltage value of the N^th cell is equal to or less than a predetermined threshold value, or is less than the predetermined threshold value, the cell number determination unit executes the voltage comparator step to determine that the (N−

1)^th cell is not assembled or has failed to operate properly even though the (N−

1)^th cell is assembled, and

the total number of assembled cells, the number of normally existing cells, and the cell assembled locations of the normally existing cells in the overall battery are determined based on a result that is obtained by repeatedly executing the processing by the voltage measuring step and the voltage comparator step, until an upper-level first cell is reached.

14. The method for determining a cell number according to claim 12, further comprising:

determining normality or abnormality of the cells by comparing the voltage value of the (i+1)^th cell that is in one location lower than the i^th cell with the voltage value of the i^th cell measured by the voltage measuring unit.

15. A computer program embodied in a non-transitory computer-readable medium in an information processing device, comprising:

a first program element configured to instruct a voltage measuring unit to select an i^th cell, where i is an integer from 1 to N, among a number N of cells that are connected in series and that configure a battery, and to measure a voltage value between a terminal in which the i^th cell and an (i−

1)^th cell, which is in one location higher than the i^th cell, are connected and a ground potential line;

a second program element configured to instruct a voltage comparator to determine whether the i^th cell exists normally or not by comparing a voltage value of an (i+1)^th cell that is in one location lower than the i^th cell with the voltage value of the i^th cell measured by the voltage measuring unit; and

a third program element configured to instruct a cell number determination unit to determine a total number of assembled cells, a number of normally existing cells, and cell assembled locations of the normally existing cells in the overall battery based on a comparison result of the voltage comparator,

wherein

the cell number determination unit determines whether or not the cells that the voltage comparator determined to be existing normally are continuous, and

when at least one of the N cells is determined not to exist normally, and the cell number determination unit determines that the number of cells that are existing normally are continuous, the cell number determination unit determines number of assembled cells to be the number of continuous cells that are existing normally.

16. The computer program according to claim 15, wherein

when the cell in which one terminal is connected to the ground potential line is a bottom-level N^th cell, the first program element is configured to instruct the voltage measuring unit to measure a voltage between a terminal in which the N^th cell and the (N−

1)^th cell that is in one location higher than the N^th cell are connected and the ground potential line,

when a voltage difference between a measurement result by the voltage measuring unit and the ground potential line is equal to or less than a predetermined threshold value, or is less than the predetermined threshold value, the second program element is configured to instruct the voltage comparator to determine that the N^th cell is not assembled or has failed to operate properly even though the N^th cell is assembled,

the first program element is configured to instruct the voltage measuring unit to measure a voltage between a terminal in which the (N−

1)^th cell and an (N−

2)^th cell that is in one location higher than the (N−

1)^th cell are connected and the ground potential line,

when a voltage difference between a measurement result by the voltage measuring unit and the measurement result of the voltage value of the N^th cell is equal to or less than a predetermined threshold value, or is less than the predetermined threshold value, the second program element is configured to instruct the voltage comparator to determine that the (N−

1)^th cell is not assembled or has failed to operate properly even though the (N−

1)^th cell is assembled, and

the program is configured to determine the total number of assembled cells, the number of normally existing cells, and the cell assembled locations of the normally existing cells in the overall battery based on a result that is obtained by repeatedly executing the first, second, and third program elements to control the voltage measuring unit and the voltage comparator, until an upper-level first cell is reached.

17. The computer program according to claim 16, wherein

the single voltage measuring unit and the single voltage comparator are provided,

a selector switch that connects the N number of the terminals that are target for measurement for N number of the cells and the single voltage measuring unit through sequentially switching is provided, and

the single voltage comparator stores and compares a previous measurement result with a latest measurement result among measurement results of the cells that are sequentially output from the voltage measuring unit in accordance with switching the selector switch.

18. The computer program according to claim 15, wherein

first program element is further configured to instruct the voltage comparator to determine normality or abnormality of the cells by comparing the voltage value of the (i+1)^th cell that is in one location lower than the i^th cell with the voltage value of the i^th cell measured by the voltage measuring unit.