Battery voltage measurement device

• US 6,639,408 B2
• Filed: 11/02/2001
• Issued: 10/28/2003
• Est. Priority Date: 11/02/2000
• Status: Expired due to Term

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation), Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation), Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Morimoto, Naohisa, Yudahira, Hirofumi, Maki, Ichiro
• Primary Examiner(s): Chapman, John E.
• Assistant Examiner(s): Kerveros, James
• Application Number:
  US10/000,060
• Publication Number:
  US 20020075004A1
• Time in Patent Office: 725 Days
• Field of Search: 324/434, 324/426, 324/428, 324/429, 324/430, 324/433, 340/636, 702/63, 320/106, 320/107, 320/119, 320/120
• US Class Current: 324/434
• 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 battery voltage measurement device includes: a plurality of first switching sections, wherein each pair of adjacent first switching sections sequentially selects two output terminals of each of a plurality of battery blocks included in a battery pack; a level change section for changing a level of a battery voltage of each battery block which is input to the level change section via the first switching section; an A/D conversion section for performing an A/D conversion of battery voltage data output from the level change section; and a reference voltage control section for controlling an output of a reference voltage of the level change section according to the polarity of the voltage input to the level change section.

Claims

1. A battery voltage measurement device comprising:

a plurality of first switching sections, wherein each pair of adjacent first switching sections sequentially selects two output terminals of each of a plurality of battery blocks included in a battery pack;

a level change section for changing a level of a battery voltage of each battery block which is input to the level change section via the first switching section;

an A/D conversion section for performing an A/D conversion of battery voltage data output from the level change section; and

a reference voltage control section for controlling an output of a reference voltage of the level change section according to the polarity of the battery voltage input to the level change section.

2. A battery voltage measurement device according to claim 1, further comprising:

a capacitance section for selectively storing a battery voltage of each of the battery blocks via the first switching section; and

a second switching section for selectively applying the battery voltage stored in the capacitance section to the level change section, wherein the level change section changes a level of the battery voltage stored in the capacitance section which is input to the level change section via the second switching section.

3. A battery voltage measurement device according to claim 2, wherein the reference voltage control section includes:

a third switching section for switching a reference voltage of the level change section; and

a first switching control section for controlling the third switching section according to the polarity of the battery voltage input to the level change section.

4. A battery voltage measurement device according to claim 2, wherein the reference voltage control section includes:

a reference voltage generation section for generating a reference voltage for the level change section; and

a reference voltage generation control section for controlling an output of the reference voltage generation section according to the polarity of the battery voltage input to the level change section.

5. A battery voltage measurement device according to claim 4, further comprising:

a fourth switching section for changing a feedback resistance value of the level change section so as to change a gain; and

a second switching control section for controlling the fourth switching section according to the polarity of the battery voltage input to the level change section.

6. A battery voltage measurement device according to claim 1, wherein the reference voltage control section includes:

a third switching section for switching a reference voltage of the level change section; and

a first switching control section for controlling the third switching section according to the polarity of the battery voltage input to the level change section.

7. A battery voltage measurement device according to claim 1, wherein the reference voltage control section includes:

a reference voltage generation section for generating a reference voltage for the level change section; and

a reference voltage generation control section for controlling an output of the reference voltage generation section according to the polarity of the battery voltage input to the level change section.

8. A battery voltage measurement device according to claim 7, further comprising:

a fourth switching section for changing a feedback resistance value of the level change section so as to change a gain; and

a second switching control section for controlling the fourth switching section according to the polarity of the battery voltage input to the level change section.

9. A battery voltage measurement device according to claim 1, wherein the control performed in accordance wit the polarity of the battery voltage input to the level change section is performed based on prestored table information for switching control.

10. A battery voltage measurement device according to claim 1, wherein when one preset reference voltage value is selected, if an A/D conversion output of the A/D conversion section represents a maximum value or a minimum value within an input voltage range of the A/D conversion section, the control performed in accordance with the polarity of the battery voltage input to the level change section is performed so as to switch the one preset reference voltage value to the other preset reference voltage value.

11. A battery voltage measurement device comprising:

a battery pack including a plurality of battery blocks;

a plurality of first switching sections, wherein each pair of adjacent first switching sections sequentially selects two output terminals of each of the plurality of battery blocks;

a level change section for changing a level of a battery voltage of each battery block which is input to the level change section via the first switching section;

an A/D conversion section for performing an A/D conversion of battery voltage data output from the level change section; and

a reference voltage control section for controlling an output of a reference voltage of the level change section according to the polarity of the battery voltage input to the level change section.

12. A battery voltage measurement device according to claim 11, further comprising:

a capacitance section for selectively storing a battery voltage of each of the battery blocks via the first switching section; and

a second switching section for selectively applying the battery voltage stored in the capacitance section to the level change section, wherein the level change section changes a level of the battery voltage stored in the capacitance section which is input to the level change section via the second switching section.

13. A battery voltage measurement device according to claim 12, wherein the reference voltage control section includes:

a third switching section for switching a reference voltage of the level change section; and

a first switching control section for controlling the third switching section according to the polarity of the battery voltage input to the level change section.

14. A battery voltage measurement device according to claim 12, wherein the reference voltage control section includes:

a reference voltage generation section for generating a reference voltage for the level change section; and

a reference voltage generation control section for controlling an output of the reference voltage generation section according to the polarity of the battery voltage input to the level change section.

15. A battery voltage measurement device according to claim 14, further comprising:

a fourth switching section for changing a feedback resistance value of the level change section so as to change a gain; and

a second switching control section for controlling the fourth switching section according to the polarity of the battery voltage input to the level change section.

16. A battery voltage measurement device according to claim 11, wherein the reference voltage control section includes:

a third switching section for switching a reference voltage of the level change section; and

a first switching control section for controlling the third switching section according to the polarity of the battery voltage input to the level change section.

17. A battery voltage measurement device according to claim 11, wherein the reference voltage control section includes:

a reference voltage generation section for generating a reference voltage for the level change section; and

a reference voltage generation control section for controlling an output of the reference voltage generation section according to the polarity of the battery voltage input to the level change section.

18. A battery voltage measurement device according to claim 17, further comprising:

a fourth switching section for changing a feedback resistance value of the level change section so as to change a gain; and

a second switching control section for controlling the fourth switching section according to the polarity of the batten voltage input to the level change section.

19. A battery voltage measurement device according to claim 11, wherein the control performed in accordance with the polarity of the battery voltage input to the level change section is performed based on prestored table information for switching control.

20. A battery voltage measurement device according to claim 11, wherein when one preset reference voltage value is selected, if an A/D conversion output of the A/D conversion section represents a maximum value or a minimum value within an input voltage range of the A/D conversion section, the control performed in accordance with The polarity of the battery voltage input to the level change section is performed so as to switch the one preset reference voltage value to the other preset reference voltage value.