Fuel cell plate conductivity detection device

Abstract

The embodiment of the utility model provides a fuel cell plate conductivity detection device, which relates to the field of fuel cell plate conductivity detection. It aims to improve the problem that the two-point plate resistance measurement method cannot identify smaller defects. The fuel cell plate conductivity detection device includes a body, a first electrode, a second electrode, a first carbon paper and a second carbon paper, and the first electrode and the second electrode are arranged in the body at intervals; the first carbon paper is fixed on the first electrode, and the first carbon paper is used to fit the surface of the plate to be tested; the second carbon paper is fixed on the second electrode, and the second carbon paper is used to fit the surface of the plate to be tested. When measuring the resistance, the electrode is in full contact with the plate through the carbon paper, and the surface of the plate is completely covered by the electrode, and all points on the surface of the plate are within the measurement range, which improves the comprehensiveness of the resistance detection, improves the detection accuracy and efficiency, and can also monitor the contact resistance between the plate and the carbon paper, as well as the abnormal conditions of the plate resistance.

Description

Technical Field

[0001] The utility model relates to the field of fuel cell plate conductivity detection, in particular to a fuel cell plate conductivity detection device. Background Art

[0002] As the core component of the fuel cell, the conductivity of the plate directly affects the overall performance of the fuel cell. Low-resistance plates can enable the fuel cell to have a higher power release capacity, reduce energy waste, and save resources. In the production process of the plate, various factors will inevitably cause the resistance value of the plate to be greater than the normal value, such as the surface of the plate being contaminated, the surface coating quality is poor, etc. This defect is difficult to identify by naked eyes or vision, and it is easy to miss detection or detection is not up to standard, resulting in defective plates being installed in the stack, affecting the final performance of the fuel cell.

[0003] The existing plate resistance measurement scheme is mostly two-point measurement, which can monitor the quality of the plate, but has certain disadvantages. When measuring, if the contact position of the two measuring points is well plated and pollution-free, but there are minor defects in other non-contact positions, the measured resistance value will increase very little compared to the normal value, which will cause such minor defects to be unable to be identified. Utility Model Content

[0004] The purpose of the utility model includes, for example, providing a device for detecting the conductivity of a fuel cell plate, which can improve the problem that a two-point plate resistance measurement method cannot identify smaller defects.

[0005] The embodiments of the present invention can be implemented as follows:

[0006] An embodiment of the utility model provides a device for detecting the conductivity of a fuel cell plate, comprising a body, a first electrode, a second electrode, a first carbon paper, and a second carbon paper, wherein the first electrode and the second electrode are arranged in the body at intervals, the distance between the second electrode and the first electrode is adjustable, and a space for placing a plate to be tested is formed between the second electrode and the first electrode; the first electrode and the second electrode are respectively used to be connected to a resistance tester; the first carbon paper is fixed to a side of the first electrode close to the second electrode, and the first carbon paper is used to fit with the surface of the plate to be tested; the second carbon paper is fixed to a side of the second electrode close to the first electrode, and the second carbon paper is used to fit with the surface of the plate to be tested.

[0007] In addition, the fuel cell plate conductivity detection device provided in the embodiment of the utility model may also have the following additional technical features:

[0008] Optionally, the first electrode and the second electrode are spaced apart in the vertical direction; and the distance between the first electrode and the second electrode in the vertical direction is adjustable.

[0009] Optionally, the second electrode is fixed in the body, and the first electrode is movably disposed above the second electrode in a vertical direction so as to move closer to or away from the second electrode.

[0010] Optionally, the fuel cell plate conductivity detection device also includes a driving mechanism, a base and an upper pressure plate; the base is fixed in the body, and the upper pressure plate is movably arranged above the base in the vertical direction; the driving mechanism is connected to the upper pressure plate, and the driving mechanism is used to drive the upper pressure plate to approach or move away from the base in the vertical direction; the first electrode is fixed on a side of the upper pressure plate close to the base, and the second electrode is fixed on a side of the base close to the upper pressure plate.

[0011] Optionally, the fuel cell plate conductivity detection device further comprises a plurality of columns arranged along the vertical direction; the plurality of columns are fixed in the body at intervals, and the upper pressure plate is slidably matched with the plurality of columns.

[0012] Optionally, the fuel cell plate conductivity detection device further includes a pressure sensor; the pressure sensor is fixed on the top of the upper pressure plate, and the pressure sensor is used to detect the force applied by the upper pressure plate.

[0013] Optionally, the driving mechanism is arranged vertically; and the pressure sensor is arranged between the driving end of the driving mechanism and the upper pressing plate.

[0014] Optionally, the fuel cell plate conductivity detection device further includes a first insulating plate and a second insulating plate; the second insulating plate is fixed between the first electrode and the upper pressing plate, and the second insulating plate is fixed between the second electrode and the base.

[0015] Optionally, the driving mechanism is an electric cylinder; the electric cylinder is fixed in the machine body, and the driving end of the electric cylinder is fixed to the upper pressing plate.

[0016] Optionally, the fuel cell plate conductivity detection device further includes a computer and a resistance tester; the first electrode and the second electrode are connected to the resistance tester, and the resistance tester is connected to the computer.

[0017] The beneficial effects of the fuel cell plate conductivity detection device of the embodiment of the utility model include, for example:

[0018] A fuel cell plate conductivity detection device comprises a body, a first electrode, a second electrode, a first carbon paper and a second carbon paper, wherein the first electrode and the second electrode are arranged in the body at intervals, the distance between the second electrode and the first electrode is adjustable, and a space for placing a plate to be tested is formed between the second electrode and the first electrode; the first electrode and the second electrode are respectively used to be connected to a resistance tester; the first carbon paper is fixed on a side of the first electrode close to the second electrode, and the first carbon paper is used to be bonded to the surface of the plate to be tested; the second carbon paper is fixed on a side of the second electrode close to the first electrode, and the second carbon paper is used to be bonded to the surface of the plate to be tested.

[0019] When measuring resistance, the electrode is in full contact with the plate through the carbon paper, and the surface of the plate is completely covered by the electrode. All points on the surface of the plate are within the measurement range, which improves the comprehensiveness of resistance detection, improves detection accuracy and efficiency, and can also monitor the contact resistance between the plate and carbon paper, as well as the abnormal conditions of the plate body resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 An axial side view of the fuel cell plate conductivity detection device provided in this embodiment;

[0022] Figure 2 A partial perspective structural diagram of a fuel cell plate conductivity detection device provided in this embodiment.

[0023] Icons: 10- fuel cell plate conductivity detection device; 100- body; 200- first electrode; 201- second electrode; 210- first carbon paper; 211- second carbon paper; 220- first insulating plate; 221- second insulating plate; 300- driving mechanism; 310- electric cylinder; 400- base; 410- upper pressure plate; 420- column; 500- pressure sensor; 600- computer; 700- resistance tester. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0027] In the description of the present utility model, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the utility model product is usually placed when used. It is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present utility model.

[0028] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0029] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0030] Combine the following Figure 1 to Figure 2 The fuel cell plate conductivity detection device 10 provided in this embodiment is described in detail.

[0031] Please refer to Figure 1 and Figure 2The embodiment of the utility model provides a fuel cell plate conductivity detection device 10, comprising a body 100, a first electrode 200, a second electrode 201, a first carbon paper 210 and a second carbon paper 211, wherein the first electrode 200 and the second electrode 201 are arranged in the body 100 at intervals, the distance between the second electrode 201 and the first electrode 200 is adjustable, and a space for placing a plate to be tested is formed between the second electrode 201 and the first electrode 200; the first electrode 200 and the second electrode 201 are respectively used to connect to a resistance tester 700; the first carbon paper 210 is fixed on a side of the first electrode 200 close to the second electrode 201, and the first carbon paper 210 is used to fit with the surface of the plate to be tested; the second carbon paper 211 is fixed on a side of the second electrode 201 close to the first electrode 200, and the second carbon paper 211 is used to fit with the surface of the plate to be tested.

[0032] The first electrode 200 is connected to the first carbon paper 210, and the first carbon paper 210 is in contact with the surface of the electrode plate; the second electrode 201 is connected to the second carbon paper 211, and the second carbon paper 211 is in contact with the surface of the electrode plate; the first electrode 200 and the second electrode 201 are in surface contact with the surfaces on both sides of the electrode plate through the first carbon paper 210 and the second carbon paper 211 respectively.

[0033] The carbon paper is in contact with the plate surface to achieve full contact between the electrode and the plate, increase the contact area, and completely cover the plate surface with the electrode. All points on the plate surface are within the measurement range, which improves the detection accuracy. It can also prevent the electrode from damaging the plate surface due to hard contact. The measured resistance value is = contact resistance between carbon paper and plate × 2 + plate body resistance, which can monitor the abnormal conditions of the contact resistance between the plate and carbon paper and the plate body resistance respectively. Both sides of the plate are covered with carbon paper to simulate the environment of the plate in the battery stack, and the measured results can more truly reflect the quality of the plate.

[0034] Reference Figure 1 and Figure 2 In this embodiment, the first electrode 200 and the second electrode 201 are spaced apart in the vertical direction; the distance between the first electrode 200 and the second electrode 201 in the vertical direction is adjustable.

[0035] The first electrode 200 is located above the second electrode 201, and the electrode plate to be tested is placed between the first electrode 200 and the second electrode 201. The first electrode 200 and the second electrode 201 are close to each other in the vertical direction to press the electrode plates. The first carbon paper 210 and the second carbon paper 211 are closely attached to the electrode plates to increase the contact area and improve the detection accuracy.

[0036] Reference Figure 1 and Figure 2In this embodiment, the second electrode 201 is fixed in the body 100 , and the first electrode 200 is movably disposed above the second electrode 201 along the vertical direction to move closer to or away from the second electrode 201 .

[0037] The second carbon paper 211 is laid on the second electrode 201 , the electrode plate is laid on the second carbon paper 211 , the first electrode 200 descends, and the first carbon paper 210 is pressed on the surface of the electrode plate to detect the resistance of the electrode plate.

[0038] Reference Figure 1 and Figure 2 In this embodiment, the fuel cell plate conductivity detection device 10 also includes a driving mechanism 300, a base 400 and an upper pressure plate 410; the base 400 is fixed in the body 100, and the upper pressure plate 410 is movably arranged above the base 400 in the vertical direction; the driving mechanism 300 is connected to the upper pressure plate 410, and the driving mechanism 300 is used to drive the upper pressure plate 410 to approach or move away from the base 400 in the vertical direction; the first electrode 200 is fixed on the side of the upper pressure plate 410 close to the base 400, and the second electrode 201 is fixed on the side of the base 400 close to the upper pressure plate 410.

[0039] The second electrode 201 is fixed on the base 400, the second carbon paper 211 is laid on the second electrode 201, and the electrode plate is laid on the second carbon paper 211. The driving mechanism 300 drives the upper pressing plate 410 to descend, driving the first electrode 200 and the first carbon paper 210 to move downward, pressing the first carbon paper 210 tightly against the electrode plate, and measuring the resistance of the electrode plate through the first electrode 200 and the second electrode 201.

[0040] The upper pressure plate 410 can be pressed by the driving mechanism 300, thereby pressing the plate, which can simulate the stress of the plate in the battery stack, and the measured result can more truly reflect the quality of the plate. The driving mechanism 300 can also apply different pressures, and reversely determine the most rational battery stack loading pressure according to the resistance value under different pressures, so that the battery stack can work at the lowest internal resistance to achieve the best performance.

[0041] Reference Figure 1 and Figure 2 In this embodiment, the fuel cell plate conductivity detection device 10 further includes a plurality of columns 420 arranged along the vertical direction; the plurality of columns 420 are fixed in the body 100 at intervals, and the upper pressure plate 410 is slidably matched with the plurality of columns 420 .

[0042] The plurality of columns 420 are used to guide and limit the movement of the upper pressing plate 410 in the vertical direction, ensuring that the upper pressing plate 410 can move horizontally in the vertical direction, so that when the lower pressing plate is pressed on the electrode plate, the second carbon paper 211 is in full contact with the surface of the electrode plate.

[0043] Reference Figure 1 and Figure 2 In this embodiment, the fuel cell plate conductivity detection device 10 further includes a pressure sensor 500 ; the pressure sensor 500 is fixed on the top of the upper pressure plate 410 , and the pressure sensor 500 is used to detect the force of the upper pressure plate 410 .

[0044] The pressure sensor 500 is used to detect the pressure on the plate. The resistance value of the plate under different pressures is obtained by performing a comprehensive analysis based on the detection value of the pressure sensor 500 and the resistance value detected by the resistance tester 700, thereby accurately detecting the performance of the plate.

[0045] Reference Figure 1 and Figure 2 In this embodiment, the driving mechanism 300 is vertically arranged; the pressure sensor 500 is arranged between the driving end of the driving mechanism 300 and the upper pressing plate 410. The pressure sensor 500 directly detects the force applied by the driving mechanism 300 and indirectly reflects the pressure on the plate, making detection easier and less prone to error.

[0046] Reference Figure 1 and Figure 2 In this embodiment, the fuel cell plate conductivity detection device 10 further includes a first insulating plate 220 and a second insulating plate 221; the second insulating plate 221 is fixed between the first electrode 200 and the upper pressing plate 410, and the second insulating plate 221 is fixed between the second electrode 201 and the base 400. The insulating plate is used to avoid conduction, thereby reducing external interference with the resistance test and improving the accuracy of the resistance detection.

[0047] Reference Figure 1 and Figure 2 In this embodiment, the driving mechanism 300 is an electric cylinder 310; the electric cylinder 310 is fixed in the machine body 100, and the driving end of the electric cylinder 310 is fixed to the upper pressing plate 410. The electric cylinder 310 is used to automatically control the rise and fall of the upper pressing plate 410, and the automatic resistance detection is realized throughout the process, and multiple sets of data can be obtained for comprehensive analysis, thereby improving the detection efficiency.

[0048] Reference Figure 1 and Figure 2 In this embodiment, the fuel cell plate conductivity detection device 10 further includes a computer 600 and a resistance tester 700; the first electrode 200 and the second electrode 201 are connected to the resistance tester 700, and the resistance tester 700 is connected to the computer 600.

[0049] The computer 600 is used to receive the detection data of the resistance tester 700 and the detection data of the pressure sensor 500, and obtains the plate quality evaluation by analyzing the data.

[0050] According to a fuel cell plate conductivity detection device 10 provided in this embodiment, the working principle of the fuel cell plate conductivity detection device 10 is: the first electrode 200 and the second electrode 201 are in contact with the plate surface through carbon paper respectively, and a surface-to-surface contact measurement method is adopted. The first electrode 200 and the second electrode 201 are gold-plated copper electrodes, and carbon paper is used to separate the electrode and the plate, which can increase the contact area and prevent hard contact from damaging the plate surface. The first electrode 200 and the second electrode 201 are respectively connected to two probes of a low resistance tester 700. A constant pressure is applied to the first electrode 200 and the second electrode 201 through a driving mechanism 300 so that the electrode, carbon paper and the plate are fully in contact, and the resistance value is measured and collected using a low resistance tester 700, and the collected data is transmitted to a computer 600 for statistics, analysis, and storage according to needs.

[0051] The fuel cell plate conductivity detection device 10 provided in this embodiment has at least the following advantages:

[0052] When measuring resistance, the electrode is in full contact with the plate through the carbon paper, and the surface of the plate is completely covered by the electrode. All points on the surface of the plate are within the measurement range, which improves the resistance detection accuracy and efficiency. It can also monitor the contact resistance between the plate and the carbon paper, and the abnormal conditions of the plate body resistance.

[0053] By measuring the resistance of the plates under pressure, we can not only measure the conductivity of the plates, but also reversely determine the most ideal stack pressure based on the resistance values ​​under different pressures, so that the stack can work at the lowest internal resistance to achieve the best performance. The force applied to the plates in the stack can be simulated, and the measured results can more realistically reflect the quality of the plates.

[0054] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A fuel cell plate conductivity detection device, characterized in that: include: Body (100); A first electrode (200) and a second electrode (201), wherein the first electrode (200) and the second electrode (201) are arranged in the body (100) at an interval, the distance between the second electrode (201) and the first electrode (200) is adjustable, and a space for placing a plate to be tested is formed between the second electrode (201) and the first electrode (200); the first electrode (200) and the second electrode (201) are respectively used to connect to a resistance tester (700); A first carbon paper (210) and a second carbon paper (211); the first carbon paper (210) is fixed to a side of the first electrode (200) close to the second electrode (201), and the first carbon paper (210) is used to be bonded to the surface of the electrode plate to be tested; the second carbon paper (211) is fixed to a side of the second electrode (201) close to the first electrode (200), and the second carbon paper (211) is used to be bonded to the surface of the electrode plate to be tested.

2. The fuel cell plate conductivity detection device according to claim 1, characterized in that: The first electrode (200) and the second electrode (201) are arranged at intervals in the vertical direction; and the distance between the first electrode (200) and the second electrode (201) in the vertical direction is adjustable.

3. The fuel cell plate conductivity detection device according to claim 2, characterized in that: The second electrode (201) is fixed in the body (100), and the first electrode (200) is movably arranged above the second electrode (201) in a vertical direction so as to move closer to or away from the second electrode (201).

4. The fuel cell plate conductivity detection device according to claim 3, characterized in that: The fuel cell plate conductivity detection device also includes a driving mechanism (300), a base (400) and an upper pressing plate (410); the base (400) is fixed in the body (100), and the upper pressing plate (410) is movably arranged above the base (400) in a vertical direction; the driving mechanism (300) is connected to the upper pressing plate (410), and the driving mechanism (300) is used to drive the upper pressing plate (410) to approach or move away from the base (400) in a vertical direction; the first electrode (200) is fixed on a side of the upper pressing plate (410) close to the base (400), and the second electrode (201) is fixed on a side of the base (400) close to the upper pressing plate (410).

5. The fuel cell plate conductivity detection device according to claim 4, characterized in that: The fuel cell plate conductivity detection device further comprises a plurality of columns (420) arranged in a vertical direction; the plurality of columns (420) are fixed in the body (100) at intervals, and the upper pressing plate (410) is slidably matched with the plurality of columns (420).

6. The fuel cell plate conductivity detection device according to claim 4, characterized in that: The fuel cell plate conductivity detection device further comprises a pressure sensor (500); the pressure sensor (500) is fixed on the top of the upper pressing plate (410), and the pressure sensor (500) is used to detect the force applied by the upper pressing plate (410).

7. The fuel cell plate conductivity detection device according to claim 6, characterized in that: The driving mechanism (300) is arranged vertically; and the pressure sensor (500) is arranged between the driving end of the driving mechanism (300) and the upper pressing plate (410).

8. The fuel cell plate conductivity detection device according to claim 4, characterized in that: The fuel cell plate conductivity detection device also includes a first insulating plate (220) and a second insulating plate (221); the second insulating plate (221) is fixed between the first electrode (200) and the upper pressing plate (410), and the second insulating plate (221) is fixed between the second electrode (201) and the base (400).

9. The fuel cell plate conductivity detection device according to any one of claims 4 to 8, characterized in that: The driving mechanism (300) is an electric cylinder (310); the electric cylinder (310) is fixed in the machine body (100), and the driving end of the electric cylinder (310) is fixed to the upper pressing plate (410).

10. The fuel cell plate conductivity detection device according to any one of claims 1 to 8, characterized in that: The fuel cell plate conductivity detection device further comprises a computer (600) and a resistance tester (700); the first electrode (200) and the second electrode (201) are connected to the resistance tester (700), and the resistance tester (700) is connected to the computer (600).

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