BATTERY SYSTEM, ELECTRIC VEHICLE, MOVING BODY, ELECTRIC POWER STORAGE DEVICE, POWER SUPPLY DEVICE AND BATTERY VOLTAGE DETECTION DEVICE

• US 20130119898A1
• Filed: 11/21/2012
• Published: 05/16/2013
• Est. Priority Date: 05/31/2010
• Status: Abandoned Application

• Current Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Inventors: Ohkura, Kazumi
• Application Number:
  US13/682,971
• Publication Number:
  US 20130119898A1
• Time in Patent Office: Days
• US Class Current: 318/139
• CPC Class Codes: B60L 2240/547 Voltage
• CPC Class Codes: B60L 2250/10 by alarm
• CPC Class Codes: B60L 2250/16 by display
• CPC Class Codes: B60L 3/0046 relating to electric energy storage systems, e.g. batteries or capacitors
• CPC Class Codes: B60L 58/14 Preventing excessive discharging
• CPC Class Codes: B60L 58/15 Preventing overcharging
• CPC Class Codes: B60L 58/18 of two or more battery modules
• CPC Class Codes: B60L 58/21 having the same nominal voltage
• CPC Class Codes: G01R 19/16542 for batteries charge condition monitoring in G01R31/36
• 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
• CPC Class Codes: G01R 35/00 Testing or calibrating of apparatus covered by the other groups of this subclass
• CPC Class Codes: H01M 10/4207 for several batteries or cells simultaneously or sequentially
• CPC Class Codes: H01M 10/441 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: H02J 7/007 Regulation of charging or discharging current or voltage
• CPC Class Codes: H02J 7/007182 in response to battery voltage
• CPC Class Codes: H02J 7/04 Regulation of charging current or voltage
• CPC Class Codes: H02J 7/14 for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02T 10/70 : Energy storage systems for electromobility, e.g. batteries

Abstract

A voltage detection section 10 comprises an A/D converter section 13 that outputs an A/D detection voltage value (Vad) for batteries 2[i] and voltage level determination sections 16[i] that output a level determination signal, which are the results of comparisons of an analog voltage signal for the batteries 2[i] and a plurality of reference voltages. In the process of the battery voltage increasing or decreasing, the level determination signal changes when the analog voltage signal for the batteries 2[i] exceeds or falls below any of the reference voltages. A level determination voltage value shown by the level determination signal at that change timing and the A/D detection voltage value (Vad) are compared, and an occurrence of an in-range failure is detected when there is a difference between the two. In this instance, if the batteries are charging, a correction that increases A/D detection voltage value is made using the ratio and difference of the determination voltage value at that change timing and the A/D detection voltage value, and if the batteries are discharging, a change that decreases the A/D detection voltage value is made using the this ratio and difference.

Claims

1. A battery system comprising:

a battery for a voltage source of an analog voltage that is the object of measurements and which can be charged and discharged and

a voltage detection section that has an A/D converter section that converts an analog voltage signal for the analog voltage that is the object of measurements to a digital voltage signal and outputs an A/D detection voltage value according to that digital voltage signal and a voltage level determination section that outputs a level determination signal that expresses size relationships between the analog voltage that is the object of measurements and various reference voltages by comparing the analog voltage that is the object of measurements with a plurality of reference voltages and detects the output voltage value for the battery from the A/D detection voltage value, wherein

the battery system further comprises a failure detection section that detects the presence or absence of occurrences of failures in the battery voltage detection section by comparing the determination voltage value for the analog voltage that is the object of measurements shown by the level determination signal at a first time corresponding to the timing at which the level determination signal changes with the A/D detection voltage value and

when the battery is charging and when the occurrence of a failure at the first time is detected, the output voltage value is detected at a second time based on the determination voltage value at the first time and the A/D detection voltage value at the second time which is a time matching the first time or subsequent to the first time.

2. The battery system according to claim 1 wherein,

when the battery is discharging and when the occurrence of the failure is detected at the first time, the output voltage value at the second time is detected based on the determination voltage value at the first time and the A/D detection voltage value at the second time.

3. The battery system according to claim 1 wherein,

when the battery is being charged and when the occurrence of a failure is detected at the first time, and the determination voltage value detected at the first time is larger than the A/D detection voltage value at the first time, the output voltage value at the second time is detected by a correction that increases the A/D detection voltage at the second time using either or both of the ratio of the determination voltage value at the first time and the A/D detection voltage value and difference between the determination voltage value at the first time and the A/D detection voltage value.

4. The battery system according to claim 2 wherein, when the battery is being discharged and when the occurrence of a failure is detected at the first time and the determination voltage value detected at the first time is smaller than the A/D detection voltage value at the first time,

the output voltage value at the second time is detected by a correction that decreases the A/D detection voltage at the second time using either or both of the ratio of the determination voltage value at the first time and the A/D detection voltage value and difference between the determination voltage value at the first time and the A/D detection voltage value.

5. The battery system according to claim 1 wherein,

when the battery is being charged and when the occurrence of a failure is detected at the first time,

a voltage value for comparison equal to or greater than the determination voltage value at the first time is set and the larger of the voltage value for comparison and the A/D detection voltage value at the second time is detected as the output voltage value at the second time.

6. The battery system according to claim 2 wherein,

when the battery is being discharged and when the occurrence of a failure is detected at the first time,

a voltage value for comparison that less than or equal to the determination voltage value at the first time is set and the smaller of the voltage value for comparison and the A/D detection voltage value at the second time is detected as the output voltage value at the second time.

7. The battery system according to claim 1 wherein

the failure detection section can detect whether or not the A/D detection voltage value is in an abnormal state based on the A/D detection voltage value and

when the A/D detection voltage value is detected as being in a specific abnormal state, the battery system detects a voltage value according to the determination voltage value as the output voltage value.

8. The battery system according to claim 1 wherein

the battery system further comprises a battery state detection section that detects either or both of an internal resistance value for the battery and a remaining capacity for the battery based on the output voltage value that has been detected.

9. An electric vehicle comprising:

the battery system according to claim 1,

a rotating motor that uses the output of the battery in the battery system,

drive wheels that drive by the rotation of the motor, and

a vehicle control section that controls the rotational state of the motor based on the output voltage value detected in the battery system.

10. A moving body comprising:

the battery system according to claim 1,

a moving body main part,

a mechanical power source that converts the electric power from the battery in the battery system to mechanical power and

a drive section that moves the moving body main part by the mechanical power from the mechanical power source.

11. An electric power storage device comprising:

the battery system according to claim 1, and

a charging an discharging control unit that carries out control for charging or discharging of the battery in the battery system.

12. A power supply device that can be connected to external equipment or a power system, comprising:

the electric power storage device according to claim 11 and

an electric power conversion device that carries out electric power conversion between the battery in the electric power storage device and the external equipment or power system under the control of the charging and discharging control unit in the electric power storage device.

13. A battery system comprising:

a battery for a voltage source of an analog voltage that is the object of measurements and which can be charged and discharged and a voltage detection section that has an A/D converter section that converts an analog voltage signal for the analog voltage that is the object of measurements to a digital voltage signal and outputs an A/D detection voltage value according to that digital voltage signal and a voltage level determination section that outputs a level determination signal according to the determination results for the analog voltage that is the object of measurements and detects the output voltage value for the battery from the A/D detection voltage value, wherein

the battery system further comprises a failure detection section that detects the presence or absence of occurrences of failures in the battery voltage detection section by comparing the determination voltage value for the analog voltage that is the object of measurements shown by the level determination signal at a first time corresponding to the timing at which the level determination signal changes with the A/D detection voltage value and

when the battery is charging and when the occurrence of a failure at the first time is detected, the output voltage value is detected at a second time based on the determination voltage value at the first time and the A/D detection voltage value at the second time which is a time matching the first time or subsequent to the first time.

14. The battery system according to claim 13 wherein,

when the battery is discharging and when the occurrence of the failure is detected at the first time, the output voltage value at the second time is detected based on the determination voltage value at the first time and the A/D detection voltage value at the second time.

15. The battery system according to claim 13 wherein,

when the battery is being charged and when the occurrence of a failure is detected at the first time, and the determination voltage value detected at the first time is larger than the A/D detection voltage value at the first time, the output voltage value at the second time is detected by a correction that increases the A/D detection voltage at the second time using either or both of the ratio of the determination voltage value at the first time and the A/D detection voltage value and difference between the determination voltage value at the first time and the A/D detection voltage value.

16. The battery system according to claim 14 wherein, when the battery is being discharged and when the occurrence of a failure is detected at the first time and the determination voltage value detected at the first time is smaller than the A/D detection voltage value at the first time,

the output voltage value at the second time is detected by a correction that decreases the A/D detection voltage at the second time using either or both of the ratio of the determination voltage value at the first time and the A/D detection voltage value and difference between the determination voltage value at the first time and the A/D detection voltage value.

17. The battery system according to claim 13 wherein,

when the battery is being charged and when the occurrence of a failure is detected at the first time,

a voltage value for comparison equal to or greater than the determination voltage value at the first time is set and the larger of the voltage value for comparison and the A/D detection voltage value at the second time is detected as the output voltage value at the second time.

18. The battery system according to claim 14 wherein,

when the battery is being discharged and when the occurrence of a failure is detected at the first time,

a voltage value for comparison that less than or equal to the determination voltage value at the first time is set and the smaller of the voltage value for comparison and the A/D detection voltage value at the second time is detected as the output voltage value at the second time.

19. The battery system according to claim 13 wherein

the failure detection section can detect whether or not the A/D detection voltage value is in an abnormal state based on the A/D detection voltage value and

when the A/D detection voltage value is detected as being in a specific abnormal state, the battery system detects a voltage value according to the determination voltage value as the output voltage value.

20. The battery system according to claim 13 wherein

the battery system further comprises a battery state detection section that detects either or both of an internal resistance value for the battery and a remaining capacity for the battery based on the output voltage value that has been detected.

21. An electric vehicle comprising:

the battery system according to claim 13, a rotating motor that uses the output of the battery in the battery system,

drive wheels that drive by the rotation of the motor, and

a vehicle control section that controls the rotational state of the motor based on the output voltage value detected in the battery system.

22. A moving body comprising:

the battery system according to claim 13,

a moving body main part,

a mechanical power source that converts the electric power from the battery in the battery system to mechanical power and

a drive section that moves the moving body main part by the mechanical power from the mechanical power source.

23. An electric power storage device comprising:

the battery system according to claim 13, and

a charging an discharging control unit that carries out control for charging or discharging of the battery in the battery system.

24. A power supply device that can be connected to external equipment or a power system, comprising:

the electric power storage device according to claim 23 and

an electric power conversion device that carries out electric power conversion between the battery in the electric power storage device and the external equipment or power system under the control of the charging and discharging control unit in the electric power storage device.

25. A battery voltage detection device comprises:

a voltage detection section that has an A/D converter section that converts an analog voltage signal for an analog voltage that is output by a battery that can be charged and discharged and that is the object of measurements to a digital voltage signal and outputs an A/D detection voltage value according to that digital voltage signal and a voltage level determination section that outputs a level determination signal that expresses size relationships between the analog voltage that is the object of measurements and various reference voltages by comparing the analog voltage that is the object of measurements with a plurality of reference voltages and detects the output voltage value for the battery from the A/D detection voltage value, wherein

this voltage detection device further comprises a failure detection section that detects the presence or absence of occurrences of failures in the battery voltage detection section by comparing the determination voltage value for the analog voltage that is the object of measurements shown by the level determination signal at a first time corresponding to the timing at which the level determination signal changes with the A/D detection voltage value and

when the battery is charging and when the occurrence of a failure at the first time is detected, the output voltage value is detected at a second time based on the determination voltage value at the first time and the A/D detection voltage value at the second time which is a time matching the first time or subsequent to the first time.

26. A battery voltage detection device comprises a voltage detection section that has an A/D converter section that converts an analog voltage signal for the analog voltage that is output by a battery that can be charged and discharged and that is the object of measurements to a digital voltage signal and outputs an A/D detection voltage value according to that digital voltage signal and a voltage level determination section that outputs a level determination signal according to the determination results for the analog voltage that is the object of measurements and detects the output voltage value for the battery from the A/D detection voltage value, wherein

this voltage detection device further comprises a failure detection section that detects the presence or absence of occurrences of failures in the battery voltage detection section by comparing the determination voltage value for the analog voltage that is the object of measurements shown by the level determination signal at a first time corresponding to the timing at which the level determination signal changes and when the battery is charging with the A/D detection voltage value and

when the occurrence of a failure at the first time is detected, the output voltage value is detected at a second time based on the determination voltage value at the first time and the A/D detection voltage value at the second time, which is a time matching the first time or subsequent to the first time.