Impedance measurement system for fuel cell

Abstract

The present application relates to the field of fuel cells, and discloses an impedance measurement system for a fuel cell, which includes a first measurement circuit and a second measurement circuit, the first measurement circuit and the second measurement circuit are respectively connected to the fuel cell in an open and closed manner, and the fuel cell is connected to an impedance measurement device; the impedance measurement device includes an on-state measurement state and an off-state measurement state, in which the first measurement circuit and the second measurement circuit are both connected to the fuel cell; in the off-state measurement state, the fuel cell and the first measurement circuit are disconnected, and the fuel cell and the second measurement circuit are closed. Provided is an impedance measurement system for a fuel cell that can perform impedance measurement in both a fuel cell operating state and an off-state state.

Description

Technical Field

[0001] The present application relates to the field of fuel cells, and in particular to an impedance measurement system for fuel cells. Background Art

[0002] The impedance state of a fuel cell is crucial to the operation state of the fuel cell. An impedance measurement system is specifically used to measure the impedance state of a fuel cell, but the existing impedance measurement system can only measure the impedance when the fuel cell is running, and cannot measure the impedance when the fuel cell is turned off. Summary of the invention

[0003] The present application mainly solves the technical problem that the impedance measurement system in the prior art can only perform impedance measurement when the fuel cell is running, but cannot perform impedance measurement when the fuel cell is shut down. The application provides an impedance measurement system for a fuel cell that can perform impedance measurement when the fuel cell is running and when the fuel cell is shut down.

[0004] In order to solve the above technical problems and achieve the above application objectives, the present application provides an impedance measurement system for a fuel cell, characterized in that it includes a first measurement circuit and a second measurement circuit, the first measurement circuit and the second measurement circuit are respectively connected to the fuel cell in an open and closed manner, and the fuel cell is connected to an impedance measurement device; the impedance measurement device includes an on-state measurement state and an off-state measurement state, in the on-state measurement state, the first measurement circuit and the second measurement circuit are both connected to the fuel cell; in the off-state measurement state, the fuel cell and the first measurement circuit are disconnected, and the fuel cell and the second measurement circuit are closed.

[0005] In one possible implementation manner, a first switch component is provided at the end of the fuel cell, and the fuel cell is connected to the first measurement circuit and the second measurement circuit respectively through the first switch component.

[0006] In one possible implementation manner, a second switch component is provided at the end of the second measuring circuit, and the second measuring circuit is connected to the first measuring circuit and the fuel cell through the second switch component.

[0007] In one embodiment, a first wire assembly is provided at the end of the fuel cell, the first wire assembly includes a first wire and a second wire, the first switch assembly includes a first switch and a second switch, the first wire is provided with the first switch, and the second wire is provided with the second switch.

[0008] In one possible implementation manner, the first measurement circuit includes a boost DC / DC module and a first power battery, and the first power battery is connected to the boost DC / DC module.

[0009] In one possible implementation, the second measurement circuit includes an isolation circuit, an active inverter circuit and a second power battery connected in sequence.

[0010] In one embodiment, a second conductor assembly is provided at the end of the isolation circuit, the second conductor assembly includes a third conductor and a fourth conductor, the second switch assembly includes a third switch and a fourth switch, the third conductor is provided with a third switch, and the fourth conductor is provided with a fourth switch.

[0011] In one possible implementation manner, the second measurement circuit further includes a third wire assembly, the third wire assembly includes a fifth wire and a sixth wire, the two ends of the fifth wire are respectively provided with a first normally open contact and a third normally open contact, and the two ends of the sixth wire are respectively provided with a second normally open contact and a fourth normally open contact; the two ends of the boost DC / DC module are respectively provided with a fourth wire assembly and a fifth wire assembly, the fourth wire assembly includes a seventh wire and an eighth wire, the fifth wire assembly includes a ninth wire and a tenth wire, the seventh wire is provided with a first normally closed contact, the eighth wire assembly is provided with a second normally closed contact, the ninth wire is provided with a third normally closed contact, and the tenth wire is provided with a fourth normally closed contact; the first switch is selectively connected to the first normally open contact or the first normally closed contact, the second switch is selectively connected to the second normally open contact or the second normally closed contact, the third switch is selectively connected to the third normally open contact or the third normally closed contact, and the fourth switch is selectively connected to the fourth normally open contact or the fourth normally closed contact.

[0012] In one possible implementation, the active inverter circuit is connected to a control module.

[0013] In one possible implementation manner, the boost DC / DC module is connected to the FCU module.

[0014] Compared with the prior art, the impedance measurement system of the fuel cell of the present application has the following beneficial effects:

[0015] When the fuel cell is working normally, the impedance measuring device is in the power-on measuring state, and all switches are switched to the normally closed state. When impedance measurement is required, the boost DC / DC module controls the input current to superimpose the sinusoidal disturbance current on the load current, thereby providing the disturbance current. The impedance measuring device collects the single-chip voltage and calculates the impedance. After the fuel cell is shut down, the impedance measuring device is in the shutdown state, and all switches are switched to the normally open state. The second power battery serves as a backup power supply, inputs a current source to the active inverter circuit, and the active inverter circuit controls the output current, and the sinusoidal current of different frequencies and amplitudes at the inverter is then provided through the isolation transformer to flow through the fuel cell. The impedance measuring device collects the voltage and calculates the impedance, and the disturbance frequency can be controlled by the active inverter circuit, so as to perform impedance measurement at different frequencies. The switching of the above two measurement methods can realize impedance measurement both when the fuel cell is running and when it is shut down.

[0016] Therefore, the present application has the characteristics of reasonable structure and convenient use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Attached Figure 1 It is a circuit diagram of this application.

[0018] Explanation of the numbers in the figure: 1. fuel cell; 2. impedance measuring device; 3. first wire; 4. second wire; 5. first switch; 6. second switch; 7. boost DC / DC module; 8. first power battery; 9. isolation circuit; 10. active inverter circuit; 11. second power battery; 12. third wire; 14. fourth wire; 15. third switch; 16. fourth switch; 17. fifth wire; 18. sixth wire; 19. first normally open contact; 20. third normally open contact; 21. second normally open contact; 22. fourth normally open contact; 23. seventh wire; 24. eighth wire; 25. ninth wire; 26. tenth wire; 27. first normally closed contact; 28. second normally closed contact; 29. ​​third normally closed contact; 30. fourth normally closed contact; 31. control module; 32. FCU module. DETAILED DESCRIPTION

[0019] In order to make the purpose, features, and advantages of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0020] The impedance measurement system in the prior art can only perform impedance measurement when the fuel cell is running, but cannot perform impedance measurement when the fuel cell is turned off.

[0021] To this end, the present application provides an impedance measurement system for a fuel cell, which includes a first measurement circuit and a second measurement circuit. The first measurement circuit and the second measurement circuit are respectively connected to the fuel cell in an open and closed manner, and the fuel cell is connected to an impedance measurement device. The impedance measurement device includes an on-state measurement state and an off-state measurement state. In the on-state measurement state, the first measurement circuit and the second measurement circuit are both connected to the fuel cell; in the off-state measurement state, the fuel cell and the first measurement circuit are disconnected, and the fuel cell and the second measurement circuit are closed.

[0022] Example:

[0023] Figure 1 An embodiment of the impedance measurement system of a fuel cell of the present application is presented.

[0024] Please refer to Figure 1 In a specific embodiment of the present application, a fuel cell impedance measurement system is provided for measuring the impedance of a fuel cell 1, including a first measurement circuit and a second measurement circuit. The fuel cell 1 is connected to an impedance measurement device 2. The impedance measurement of the fuel cell 1 in the on state and the off state is achieved by connecting and disconnecting the fuel cell 1 with the first measurement circuit and the second measurement circuit.

[0025] Among them, the impedance measuring device 2 includes an on-state and an off-state. In the on-state, the first measuring circuit and the second measuring circuit are both connected to the fuel cell 1; in the off-state, the fuel cell 1 and the first measuring circuit are disconnected, and the fuel cell 1 and the second measuring circuit are closed.

[0026] When the fuel cell 1 is working normally, the impedance measuring device 2 is in the start-up measuring state, and all switches are switched to the normally closed state. When impedance measurement is required, the boost DC / DC module 7 controls the input current to superimpose the sinusoidal disturbance current on the load current, thereby providing the disturbance current, and the impedance measuring device 2 collects the single-chip voltage and calculates the impedance; after the fuel cell 1 is shut down, the impedance measuring device 2 is in the shutdown state, and all switches are switched to the normally open state. The second power battery 11 is used as a backup power supply to input a current source to the active inverter circuit 10, and the active inverter circuit 10 controls the output current, inverts the sinusoidal current of different frequencies and amplitudes, and then provides the combustion current flowing through the fuel cell 1 through the isolation transformer, and the impedance measuring device 2 collects the voltage and calculates the impedance, and the disturbance frequency can be controlled by the active inverter circuit 10, so as to perform impedance measurement at different frequencies. The switching of the above two measurement methods can realize impedance measurement in the running state of the fuel cell 1 and impedance measurement in the shutdown state.

[0027] In a specific embodiment of the present application, the connection and disconnection between the fuel cell 1 and the first measuring circuit and the second measuring circuit are realized by a switch.

[0028] In a specific embodiment of the present application, a first switch component is disposed at the end of the fuel cell 1, and the fuel cell 1 is connected to the first measuring circuit and the second measuring circuit through the first switch component.

[0029] Among them, a first wire assembly is arranged at the end of the fuel cell 1, the first wire assembly includes a first wire 3 and a second wire 4, the first switch assembly includes a first switch 5 and a second switch 6, the first wire 3 is arranged with the first switch 5, and the second wire 4 is arranged with the second switch 6.

[0030] In a specific embodiment of the present application, a second switch component is provided at the end of the second measuring circuit, and the second measuring circuit is connected to the first measuring circuit and the fuel cell 1 through the second switch component.

[0031] In a specific embodiment of the present application, the first measuring circuit includes a boost DC / DC module 7 and a first power battery 8, the first power battery 8 is connected to the boost DC / DC module 7, and the second measuring circuit includes an isolation circuit 9, an active inverter circuit 10 and a second power battery 11 connected in sequence.

[0032] Among them, a second wire assembly is arranged at the end of the isolation circuit 9, the second wire assembly includes a third wire 12 and a fourth wire 14, the second switch assembly includes a third switch 15 and a fourth switch 16, the third wire 12 is arranged with the third switch 15, and the fourth wire 14 is arranged with the fourth switch 16.

[0033] In a specific embodiment of the present application, the second measurement circuit further includes a third wire assembly, the third wire assembly includes a fifth wire 17 and a sixth wire 18, the two ends of the fifth wire 17 are respectively provided with a first normally open contact 19 and a third normally open contact 20, the two ends of the sixth wire 18 are respectively provided with a second normally open contact 21 and a fourth normally open contact 22; the two ends of the boost DC / DC module 7 are respectively provided with a fourth wire assembly and a fifth wire assembly, the fourth wire assembly includes a seventh wire 23 and an eighth wire 24, the fifth wire assembly includes a ninth wire 25 and a tenth wire 26, A first normally closed contact 27 is provided on the seventh wire 23, a second normally closed contact 28 is provided on the eighth wire assembly, a third normally closed contact 29 is provided on the ninth wire 25, and a fourth normally closed contact 30 is provided on the tenth wire 26; the first switch 5 is selectively connected to the first normally open contact 19 or the first normally closed contact 27, the second switch 6 is selectively connected to the second normally open contact 21 or the second normally closed contact 28, the third switch 15 is selectively connected to the third normally open contact 20 or the third normally closed contact 29, and the fourth switch 16 is selectively connected to the fourth normally open contact 22 or the fourth normally closed contact 30.

[0034] In the power-on state, the first switch 5 to the fourth switch 16 are all connected to the normally closed contact. In the power-off state, the first switch 5 to the fourth switch 16 are all in contact with the normally open point.

[0035] In a specific embodiment of the present application, the active inverter circuit 10 is connected to the control module 31 .

[0036] In a specific embodiment of the present application, the boost DC / DC module 7 is connected to the FCU module 32 .

[0037] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0038] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0039] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A fuel cell impedance measurement system, characterized in that: The device comprises a first measuring circuit and a second measuring circuit, wherein the first measuring circuit and the second measuring circuit are respectively connected to a fuel cell (1) in an open and closed manner, and the fuel cell (1) is connected to an impedance measuring device (2); the impedance measuring device (2) comprises an on-state measuring state and an off-state measuring state, wherein in the on-state measuring state, the first measuring circuit and the second measuring circuit are both connected to the fuel cell (1); in the off-state measuring state, the fuel cell (1) and the first measuring circuit are disconnected from each other, and the fuel cell (1) and the second measuring circuit are closed; The end of the fuel cell (1) is provided with a first switch component, and the fuel cell (1) is connected to the first measuring circuit and the second measuring circuit respectively through the first switch component; A second switch component is provided at the end of the second measuring circuit, and the second measuring circuit is connected to the first measuring circuit and the fuel cell (1) through the second switch component; The fuel cell (1) is provided with a first wire assembly at the end thereof, the first wire assembly comprising a first wire (3) and a second wire (4), the first switch assembly comprising a first switch (5) and a second switch (6), the first wire (3) being provided with the first switch (5), and the second wire (4) being provided with the second switch (6); The first measuring circuit comprises a boost DC / DC module (7) and a first power battery (8), wherein the first power battery (8) is connected to the boost DC / DC module (7); The second measuring circuit comprises an isolation circuit (9), an active inverter circuit (10) and a second power battery (11) which are connected in sequence.

2. The impedance measurement system of a fuel cell according to claim 1, characterized in that: A second conductor assembly is provided at the end of the isolation circuit (9), the second conductor assembly includes a third conductor (12) and a fourth conductor (14), the second switch assembly includes a third switch (15) and a fourth switch (16), the third conductor (12) is provided with the third switch (15), and the fourth conductor (14) is provided with the fourth switch (16).

3. The impedance measurement system of a fuel cell (1) according to claim 2, characterized in that: The second measuring circuit further comprises a third conductor assembly, the third conductor assembly comprising a fifth conductor (17) and a sixth conductor (18), the two ends of the fifth conductor (17) are respectively provided with a first normally open contact (19) and a third normally open contact (20), the two ends of the sixth conductor (18) are respectively provided with a second normally open contact (21) and a fourth normally open contact (22); the two ends of the boost DC / DC module (7) are respectively provided with a fourth conductor assembly and a fifth conductor assembly, the fourth conductor assembly comprises a seventh conductor (23) and an eighth conductor (24), the fifth conductor assembly comprises a ninth conductor (25) and a tenth conductor (26), the seventh conductor (23) is provided with a first normally closed contact (27), a second normally closed contact (28) is provided on the eighth wire, a third normally closed contact (29) is provided on the ninth wire (25), and a fourth normally closed contact (30) is provided on the tenth wire (26); the first switch (5) is selectively connected to the first normally open contact (19) or the first normally closed contact (27), the second switch (6) is selectively connected to the second normally open contact (21) or the second normally closed contact (28), the third switch (15) is selectively connected to the third normally open contact (20) or the third normally closed contact (29), and the fourth switch (16) is selectively connected to the fourth normally open contact (22) or the fourth normally closed contact (30).

4. The impedance measurement system of a fuel cell (1) according to claim 1, characterized in that: The active inverter circuit (10) is connected to a control module (31).

5. The impedance measurement system of a fuel cell (1) according to claim 1, characterized in that: The boost DC / DC module (7) is connected to the FCU module (32).

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