BATTERY SYSTEM BALANCING CONTROL METHOD FOR PERFORMING BALANCING CONTROL WITH AID OF REFERENCE VOLTAGE INFORMATION AND BATTERY SYSTEM THEREOF

• US 20140239899A1
• Filed: 02/27/2014
• Published: 08/28/2014
• Est. Priority Date: 02/27/2013
• Status: Active Grant

• Current Assignee: Fu-Sheng Tsai
• Original Assignee: Fu-Sheng Tsai
• Inventors: Tsai, Fu-Sheng
• Granted Patent: US 9,214,820 B2
• Time in Patent Office: Days
• US Class Current: 320/118
• CPC Class Codes: H02J 7/0013 acting upon several batteries simultaneously or sequentially H02J7/1423 takes precedence
• CPC Class Codes: H02J 7/0014 Circuits for equalisation of charge between batteries
• CPC Class Codes: H02J 7/0047 with monitoring or indicating devices or circuits
• CPC Class Codes: H02J 7/00714 in response to battery charging or discharging current
• CPC Class Codes: H03K 5/04 by increasing duration; by decreasing duration
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

A battery system balancing control method for performing balancing control with aid of reference voltage information and battery system are provided. The battery system balancing control method includes: after a specific reference resistor of a plurality of reference resistors is installed into a specific battery module of a set of battery modules connected in series within a power supply device and the reference resistors are electrically connected in series, converting a total voltage of the set of battery modules into the reference voltage information, wherein each battery module of the set of battery modules includes at least one battery cell, and the reference voltage information includes a plurality of sets of reference voltage levels respectively corresponding to the reference resistors; and performing balancing control of the specific battery module according to a set of reference voltage levels corresponding to the specific reference resistor within the sets of reference voltage levels.

Claims

1. A battery system balancing control method for performing balancing control with aid of reference voltage information, the battery system balancing control method being applied to a power supply device, the battery system balancing control method comprising the steps of:

after a first reference resistor of a plurality of reference resistors is installed into a first battery module of a set of battery modules connected in series within the power supply device and a second reference resistor of the plurality of reference resistors is installed into a second battery module of the set of battery modules and the reference resistors are electrically connected in series, converting a total voltage of the set of battery modules into the reference voltage information, wherein the first battery module comprises a first battery cell having a first battery voltage, the second battery module comprises a second battery cell having a second battery voltage, and the reference voltage information comprises a first set of reference voltage levels corresponding to the first reference resistor and a second set of reference voltage levels corresponding to the second reference resistor; and

performing balancing control of the first battery module according to the first set of reference voltage levels corresponding to the first reference resistor, and performing balancing control of the second battery module according to the second set of reference voltage levels corresponding to the second reference resistor.

2. The battery system balancing control method of claim 1, wherein a resistance error value of the first reference resistor is less than 0.1%.

3. The battery system balancing control method of claim 1, wherein the step of performing balancing control of the first battery module according to the first set of reference voltage levels corresponding to the first reference resistor further comprises:

when the first battery voltage is greater than a first reference voltage corresponding to a voltage difference between the first set of reference voltage levels, controlling the first battery cell to discharge.

4. The battery system balancing control method of claim 1, wherein the first reference resistor is divided into a first resistor, a second resistor, and a third resistor;

and each of a resistance value of the first resistor and a resistance value of the third resistor is equivalent to two-fifth of a resistance value of the first reference resistor, and a resistance value of the second resistor is equivalent to one-fifth of the resistance value of the first reference resistor.

5. The battery system balancing control method of claim. 4, wherein based on a first reference voltage corresponding to a voltage difference between the first set of reference voltage levels, the first battery cell is selectively controlled to discharge;

and the first reference voltage is a voltage difference between two terminals of the second resistor.

6. The battery system balancing control method of claim 1, wherein based on a first reference voltage corresponding to a voltage difference between the first set of reference voltage levels, a first balancing control circuit is arranged to selectively control the first battery cell to discharge, wherein the first balancing control circuit comprises a first comparator;

and the first comparator comprises a positive terminal and a negative terminal, wherein the first reference voltage is input into the positive terminal, and the first battery voltage is input into the negative terminal.

7. The battery system balancing control method of claim 6, wherein an input impedance of the first comparator is greater than 1 giga-ohm.

8. The battery system balancing control method of claim 1, wherein a resistance value of the first reference resistor is greater than 1000 ohms.

9. The battery system balancing control method of claim 1, wherein based on a first reference voltage corresponding to a voltage difference between the first set of reference voltage levels, a first balancing control circuit is arranged to selectively control the first battery cell to discharge;

and the first balancing control circuit is a passive balancing control circuit.

10. The battery system balancing control method of claim 1, wherein based on a first reference voltage corresponding to a voltage difference between the first set of reference voltage levels, a first balancing control circuit is arranged to selectively control the first battery cell to discharge;

and the first balancing control circuit is an active balancing control circuit.

11. A battery system for performing balancing control with aid of reference voltage information, the battery system comprising at least one portion of a power supply device, the battery system comprising:

a first battery module, which is one of a set of battery modules connected in series within the power supply device, wherein the first battery module comprises;

a first battery cell having a first battery voltage;

a first reference resistor, which is one of a plurality of reference resistors electrically connected in series to convert a total voltage of the set of battery modules into the reference voltage information, wherein the first reference resistor of the plurality of reference resistors is installed into the first battery module to generate a first set of reference voltage levels, and the reference voltage information comprises the first set of reference voltage levels; and

a first balancing control circuit, electrically connected to the first battery cell and the first reference resistor, arranged to perform balancing control of the first battery module according to the first set of reference voltage levels corresponding to the first reference resistor; and

a second battery module, which is another one of the set of battery modules connected in series within the power supply device, wherein the second battery module comprises;

a second battery cell connected to the first battery cell in series and having a second battery voltage;

a second reference resistor connected to the reference resistor in series and being another one of the plurality of reference resistors electrically connected in series to convert the total voltage of the set of battery modules into the reference voltage information, wherein the second reference resistor of the plurality of reference resistors is installed into the second battery module to generate a second set of reference voltage levels, and the reference voltage information comprises the second set of reference voltage levels; and

a second balancing control circuit, electrically connected to the second battery cell and the second reference resistor, arranged to perform balancing control of the second battery module according to the second set of reference voltage levels corresponding to the second reference resistor.

12. The battery system of claim 11, wherein a resistance error value of the first reference resistor is less than 0.1%.

13. The battery system of claim 11, wherein when the first battery voltage is greater than a first reference voltage corresponding to a voltage difference between the first set of reference voltage levels, the first balancing control circuit controls the first battery cell to discharge.

14. The battery system of claim 11, wherein the first reference resistor is divided into a first resistor, a second resistor, and a third resistor;

and each of a resistance value of the first resistor and a resistance value of the third resistor is equivalent to two-fifth of a resistance value of the first reference resistor, and a resistance value of the second resistor is equivalent to one-fifth of the resistance value of the first reference resistor.

15. The battery system of claim 14, wherein based on a first reference voltage corresponding to a voltage difference between the first set of reference voltage levels, the first balancing control circuit selectively controls the first battery cell to discharge;

and the first reference voltage is a voltage difference between two terminals of the second resistor.

16. The battery system of claim 11, wherein based on a first reference voltage corresponding to a voltage difference between the first set of reference voltage levels, the first balancing control circuit selectively controls the first battery cell to discharge, wherein the first balancing control circuit comprises a first comparator;

and the first comparator comprises a positive terminal and a negative terminal, wherein the first reference voltage is input into the positive terminal, and the first battery voltage is input into the negative terminal.

17. The battery system of claim 16, wherein an input impedance of the first comparator is greater than 1 giga-ohm.

18. The battery system of claim 11, wherein a resistance value of the first reference resistor is greater than 1000 ohms.

19. The battery system of claim 11, wherein the first balancing control circuit is a passive balancing control circuit.

20. The battery system of claim 11, wherein the first balancing control circuit is an active balancing control circuit.