A fuel cell potential distribution test device

Abstract

The present invention provides a fuel cell potential distribution test device, which belongs to the field of fuel cell technology. The device includes: a membrane electrode, at least one potential sensor assembly located on the upper and lower surfaces of the membrane electrode; the potential sensor assembly is used to detect the potential distribution of the membrane electrode. The present invention sets the potential sensor assembly, and by adjusting the number, position and arrangement of the bridge and the potential sensor group, the cathode potential and the anode potential at any position of the membrane electrode can be tested simultaneously, and the potential test range is greatly improved; and the relative position of the potential sensor assembly is fixed, the test error is small, the accuracy is high, and the operation is stable; the present invention has high reliability, the reaction electrode assembly is located in the active area of ​​the membrane electrode, and there are sufficient water molecules to maintain the stable operation of the reaction electrode assembly.

Description

Technical Field

[0001] The invention belongs to the technical field of batteries, and in particular relates to a fuel cell potential distribution testing device. Background Art

[0002] The proton exchange membrane fuel cell system is a very efficient hydrogen energy conversion device. Under the action of an electrocatalyst, the chemical energy contained in hydrogen and oxygen can be directly converted into electrical energy, and the only product is water. The entire conversion process is a mild electrochemical reaction process, which is not limited by the thermodynamic Carnot cycle, and its theoretical energy conversion efficiency is as high as 87%. It has extremely broad application prospects in various fields such as aerospace, submarines, land transportation, and fixed power stations. The proton exchange membrane fuel cell system is a complex system with strong coupling of multiple parameters of "gas-water-electricity-heat-force", including a stack, a hydrogen subsystem, an air subsystem, a cooling subsystem, and a load control subsystem. Among them, the stack is the core place where the above electrochemical reaction occurs. The stack is generally composed of dozens or even hundreds of single cells, and the single cell is composed of a membrane electrode and a frame. Hydrogen undergoes an oxidation reaction on the anode side of the membrane electrode to generate an anode potential, which can reflect the performance and state of the anode side of the membrane electrode; oxygen undergoes a reduction reaction on the cathode side of the membrane electrode to generate a cathode potential, which can reflect the performance and state of the cathode side of the membrane electrode. Under ideal conditions, the potential at different locations of the cathode / anode of the membrane electrode shows a uniform distribution characteristic, and the power generation capacity and working state at different locations are completely consistent, which is very beneficial for fuel cell system control, key material life, system reliability, and durability. However, under the actual operating conditions of fuel cells, due to factors such as uneven gas distribution, uneven temperature distribution, uneven water content distribution, ice formation, and local catalyst activity differences within the membrane electrode surface, the potential distribution at different locations of the cathode / anode of the membrane electrode will be uneven, which can easily cause the performance of key materials of the membrane electrode to decay or even structural damage, seriously affecting the durability and operating stability of the membrane electrode and the stack. At the same time, the change in the potential distribution within the membrane electrode surface directly reflects the operating state of the membrane electrode and the stack.

[0003] Related technology: The proton membrane is cut into small pieces, and the prepared catalyst slurry is evenly sprayed on the upper and lower surfaces of the small proton membrane. The spraying area 1 starts from the edge of one end of the proton membrane and crosses a part of the proton membrane centerline; the spraying area 2 starts from the edge of the other end of the proton membrane and crosses a part of the proton membrane centerline. Thus, a catalytic layer is formed on the upper and lower surfaces of the proton membrane, and the proton membrane serves as a solid electrolyte. Then the proton membrane is folded in half along the surface containing the catalyst part, and the catalyst is completely contained in the facing area without leakage. The ends of the two platinum wires are respectively placed in the folded area as reaction electrodes, and then hot-pressed with a hot press to form a device. The above-mentioned pressed device is placed in the active area of ​​the fuel cell membrane electrode and hot-pressed again. The two platinum wires are connected to the positive and negative electrodes of the DC power supply respectively, and a stable current is applied. The surface of the platinum wire connected to the negative electrode undergoes a hydrogen evolution reaction, and the surface of the platinum wire connected to the positive electrode undergoes an oxygen evolution reaction. The hydrogen evolution electrode is used as the second reaction electrode, and its potential is set to 0V. The cathode potential can be obtained by detecting the voltage between the cathode current collector and the second reaction electrode of the fuel cell using a voltage detection device. The anode potential can be obtained by detecting the voltage between the anode current collector and the second reaction electrode of the fuel cell.

[0004] The above scheme collects the voltage between the current collector and the second reaction electrode. The current collector has a huge area and contacts the entire cathode side or the entire anode side. The average cathode potential and the average anode potential are obtained by testing, but the potential distribution at different positions on the cathode side and the anode side cannot be obtained. The preparation process of the first reaction electrode device used is complicated and requires spraying and hot pressing. The first reaction electrode device needs to be hot pressed again when arranged in the membrane electrode, which is a cumbersome process and inefficient. Summary of the invention

[0005] The present invention provides a fuel cell potential distribution testing device, which can solve the technical problem that the potential distribution at different positions on the cathode side and the potential distribution at different positions on the anode side cannot be obtained.

[0006] The technical solution provided by the present invention is as follows:

[0007] An embodiment of the present invention provides a fuel cell potential distribution testing device, the device comprising:

[0008] Membrane electrode,

[0009] at least one potential sensor assembly located on the upper and lower surfaces of the membrane electrode;

[0010] The potential sensor assembly is used to detect the potential distribution of the membrane electrode.

[0011] In an optional embodiment, the potential sensor assembly includes a frame assembly, a detection electrode assembly and a reaction electrode assembly;

[0012] The frame assembly is provided with the detection electrode assembly and the reaction electrode assembly;

[0013] The frame assembly is disposed on both the upper and lower surfaces of the membrane electrode, and the membrane electrode is bonded to the detection electrode assembly and the reaction electrode assembly.

[0014] In an optional embodiment, the reaction electrode assembly includes: a first reaction electrode and a second reaction electrode;

[0015] The first reaction electrode is arranged on a side of the frame assembly that is attached to the membrane electrode.

[0016] The second reaction electrode is arranged on the other side where the frame assembly and the membrane electrode are attached;

[0017] The projections of the first reaction electrode and the second reaction electrode on a horizontal plane overlap.

[0018] In an optional embodiment, the detection electrode assembly includes a first detection electrode and a second detection electrode;

[0019] The first detection electrode is arranged on a side of the frame assembly that is in contact with the membrane electrode.

[0020] The second detection electrode is arranged on the other side where the frame assembly is attached to the membrane electrode;

[0021] The projections of the first detection electrode and the second detection electrode on a horizontal plane overlap.

[0022] In an optional embodiment, the frame assembly includes a first frame and a second frame, and the first frame and the second frame are arranged opposite to each other;

[0023] The center positions of the opposite surfaces of the first frame and the second frame are both provided with a receiving groove;

[0024] The detection electrode assembly and the reaction electrode assembly are arranged in the containing tank.

[0025] In an optional embodiment, a first side ear is disposed on the outer side of the first frame, and a second side ear is disposed on the outer side of the second frame, and the projections of the first side ear and the second side ear overlap.

[0026] In an optional embodiment, the first frame includes a first sub-frame and a second sub-frame that are relatively attached to each other, a detection electrode assembly and a reaction electrode assembly are disposed on the upper surface of the first sub-frame, and the first side ears are disposed on the outer sides of the first sub-frame and the second sub-frame;

[0027] The second frame includes a relatively fitted third sub-frame and a fourth sub-frame, the upper surface of the third sub-frame is provided with a detection electrode assembly and a reaction electrode assembly; the outer sides of the third sub-frame and the fourth sub-frame are both provided with the second side ears.

[0028] In an optional embodiment, a first via hole is provided at the first end of the second sub-frame, a first pad hole is provided on the first side ear on the outer side of the second sub-frame, and the detection electrode assembly and the reaction electrode assembly are connected to an external device through the first via hole and the first pad hole;

[0029] The first end of the third sub-frame has a second via hole, the second side ear on the outer side of the fourth sub-frame is provided with a second pad hole, and the detection electrode assembly and the reaction electrode assembly are connected to external devices through the second via hole and the second pad hole.

[0030] In an optional embodiment, a first bridge is provided at the center of the first sub-frame and the second sub-frame;

[0031] The third sub-frame and the fourth sub-frame have a second connecting bridge at their centers;

[0032] The detection electrode assembly and the reaction electrode assembly are located on the first bridge and the second bridge.

[0033] In an optional embodiment, the potential sensor assembly further includes a second frame assembly connecting circuit and a first frame assembly connecting circuit;

[0034] The first frame component connection circuit includes a first wire, a second wire, a third wire, a first pad, a second pad and a third pad, the first wire is electrically connected to the first end of the second wire and then connected to the first reaction electrode, the second end of the first wire is connected to the first pad, the second end of the second wire is connected to the second pad, the first end of the third wire is connected to the first detection electrode, the second end is connected to the third pad, and the third wire is insulated from the first wire and the second wire;

[0035] The second frame component connection circuit includes a fourth wire, a fifth wire, a fourth pad and a fifth pad, the first end of the fourth wire is connected to the second reaction electrode, and the second end is connected to the fourth pad; the first end of the fifth wire is connected to the second detection electrode, and the second end is connected to the fifth pad; the fourth wire is insulated from the fifth wire.

[0036] In an optional embodiment, the membrane electrode comprises a proton membrane, a cathode catalyst layer located on a first side of the proton membrane, and an anode catalyst layer located on a second side of the proton membrane, wherein the first side is opposite to the second side.

[0037] The method provided by the embodiment of the present invention has at least the following beneficial effects:

[0038] The test device provided in the embodiment of the present invention can simultaneously test and obtain the cathode potential and anode potential at any position of the membrane electrode by setting a potential sensor assembly and adjusting the number, position and arrangement of the bridge and the potential sensor group, thereby greatly improving the potential test range; and the relative position of the potential sensor assembly is fixed, the test error is small, the accuracy is high, and the operation is stable; the present invention has high reliability, the reaction electrode is located in the active area of ​​the membrane electrode, and there are sufficient water molecules to maintain the stable operation of the reaction electrode. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The above and other objects, features and advantages of the present disclosure will become more apparent through a more detailed description of exemplary embodiments of the present disclosure in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present disclosure.

[0040] Figure 1 The overall structure schematic diagram of the fuel cell potential distribution test device is shown;

[0041] Figure 2 A schematic diagram of the cross-sectional structure of the electrode arrangement of a fuel cell potential distribution test device is shown;

[0042] Figure 3 It shows a schematic diagram of the structure of the first frame explosion diagram of the fuel cell potential distribution test device;

[0043] Figure 4 It shows a schematic diagram of the exploded view of the second frame of the fuel cell potential distribution test device;

[0044] Figure 5 A schematic cross-sectional diagram of the electrical connection between the electrodes and the wires of the fuel cell potential distribution test device is shown;

[0045] Figure 6 A schematic diagram of the front structure of the first frame of the fuel cell potential distribution test device is shown;

[0046] Figure 7 A schematic diagram of the back structure of the first frame of the fuel cell potential distribution test device is shown;

[0047] Figure 8 A schematic diagram of the front structure of the second frame of the fuel cell potential distribution test device is shown;

[0048] Fig. 9 A schematic diagram of the back structure of the second frame of the fuel cell potential distribution testing device is shown.

[0049] Wherein, the accompanying drawings are marked as follows:

[0050] 100-membrane electrode, 101-proton membrane, 102-cathode catalyst layer, 103-anode catalyst layer, 1-potential sensor assembly, 11-first reaction electrode, 12-second reaction electrode, 13-first detection electrode, 14-second detection electrode, 15-first frame, 151-first side ear, 152-first bridge, 153-first sub-frame, 154-second sub-frame, 16-second frame, 161-second side ear, 162-second bridge, 163-third sub-frame, 164-fourth sub-frame, 105-first via hole, 106-first pad hole, 18-first wire, 19-second wire, 20-third wire, 21-first pad, 22-second pad, 23-third pad, 24-fourth wire, 25-fifth wire, 26-fourth pad, 27-fifth pad. DETAILED DESCRIPTION

[0051] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present disclosure more thorough and complete, and to fully convey the scope of the present disclosure to those skilled in the art.

[0052] As used herein, the term "including" and its variations mean open inclusion, i.e., "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "based at least in part on". The terms "an example embodiment" and "an embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first", "second", etc. may refer to different or the same objects. Other explicit and implicit definitions may also be included below.

[0053] See also Figure 1 , an embodiment of the present invention provides a fuel cell potential distribution test device, the device comprising: a membrane electrode 100, at least one potential sensor assembly 1 located on the upper and lower surfaces of the membrane electrode 100;

[0054] The potential sensor assembly 1 is used to detect the potential distribution of the membrane electrode 100 .

[0055] The device provided by the embodiment of the present invention will be further explained and described below through optional embodiments.

[0056] In an optional embodiment, the membrane electrode 100 includes a proton membrane 101, a cathode catalyst layer 102 located on a first surface of the proton membrane 101, and an anode catalyst layer 103 located on a second surface of the proton membrane 101, wherein the first surface is opposite to the second surface.

[0057] A fuel cell stack is generally composed of dozens or even hundreds of cells. The schematic diagram of the cell structure is as follows: Figure 1 As shown, the membrane electrode 100 is composed of three parts: a proton membrane 101, a cathode catalyst layer and an anode catalyst layer. Figure 2 As shown, the cathode catalyst layer 102 is located on the first side of the proton membrane 101 , and the anode catalyst layer 103 is located on the second side of the proton membrane 101 .

[0058] In an optional embodiment, the potential sensor assembly 1 includes a frame assembly, a detection electrode assembly and a reaction electrode assembly;

[0059] The frame assembly is provided with a detection electrode assembly and a reaction electrode assembly;

[0060] Frame components are provided on the upper and lower surfaces of the membrane electrode 100, and the membrane electrode 100 is bonded to the detection electrode component and the reaction electrode component.

[0061] The detection electrode assembly and the reaction electrode assembly are attached to the membrane electrode 100. When current is applied to the electrodes, the anode potential and the cathode potential can be obtained by the difference between the detection electrode assembly and the reaction electrode assembly.

[0062] In an optional embodiment, the reaction electrode assembly includes: a first reaction electrode 11 and a second reaction electrode 12;

[0063] The first reaction electrode 11 is arranged on the side where the frame assembly and the membrane electrode 100 are attached.

[0064] The second reaction electrode 12 is arranged on the other side where the frame assembly and the membrane electrode 100 are attached;

[0065] The projections of the first reaction electrode 11 and the second reaction electrode 12 on the horizontal plane overlap.

[0066] The overlap of the projections of the first reaction electrode 11 and the second reaction electrode 12 on the horizontal plane can ensure that the positions of the first reaction electrode 11 and the second reaction electrode 12 on the front and back sides of the membrane electrode 100 are the same, and can ensure that the measured potential is the real potential at the same position of the membrane electrode 100.

[0067] In an optional embodiment, the detection electrode assembly includes a first detection electrode 13 and a second detection electrode 14;

[0068] The first detection electrode 13 is disposed on a side of the frame assembly that is attached to the membrane electrode 100.

[0069] The second detection electrode 14 is disposed on the other side where the frame assembly and the membrane electrode 100 are attached;

[0070] The projections of the first detection electrode 13 and the second detection electrode 14 on the horizontal plane overlap.

[0071] Furthermore, the overlap of the projections of the first detection electrode 13 and the second detection electrode 14 on the horizontal plane can ensure that the positions of the first detection electrode 13 and the second detection electrode 14 on the front and back sides of the membrane electrode 100 are the same, and can ensure that the measured potential is the detection potential at the same position of the membrane electrode 100.

[0072] In an optional embodiment, the frame assembly includes a first frame 15 and a second frame 16, and the first frame 15 and the second frame 16 are arranged opposite to each other;

[0073] The center positions of the opposite surfaces of the first frame 15 and the second frame 16 are both provided with receiving grooves;

[0074] A detection electrode assembly and a reaction electrode assembly are arranged in the containing tank.

[0075] The length and width of the first frame 15 and the second frame 16 are both greater than the length and width of the membrane electrode 100. Furthermore, the first frame 15 and the second frame 16 may be rectangular frames, and the short sides of the rectangular frames have at least one grid space.

[0076] The first frame 15 and the second frame 16 in the fuel cell are made of a polymer film with high insulation, high thermal stability, high mechanical stability, and high chemical stability, so as to adapt to the high temperature, high humidity, high acidity, and oxygen-containing electrochemical environment inside the fuel cell.

[0077] See also Figure 3 In an optional embodiment, a first side ear 151 is provided on the outer side of the first frame 15, see Figure 4 A second side ear 161 is disposed on the outer side of the second frame 16 , and the projections of the first side ear 151 and the second side ear 161 coincide with each other.

[0078] That is, when the first frame 15 and the second frame 16 are covered, the first frame 15 and the second frame 16 can be connected together through the first side ear 151 and the second side ear 161. Furthermore, the first frame 15 and the second frame 16 are bonded together by glue.

[0079] In an optional embodiment, the first frame 15 further has a first connecting bridge 152 , and the second frame 16 has a second connecting bridge 162 . The first connecting bridge 152 coincides with the central axis of the first side ear 151 , and the second connecting bridge 162 coincides with the central axis of the second side ear 161 .

[0080] Furthermore, the first bridge 152 and the second bridge 162 are located inside the frame, and their lengths and positions can be adjusted as required, so that the potentials at different positions of the fuel cell membrane electrode 100 can be tested.

[0081] See also Figure 3In an optional embodiment, the first frame 15 includes a relatively fitted first sub-frame 153 and a second sub-frame 154, a detection electrode assembly and a reaction electrode assembly are provided on the upper surface of the first sub-frame 153, and a first side ear 151 is provided on the outer side of the first sub-frame 153 and the second sub-frame 154.

[0082] See also Figure 4 The second frame 16 includes a relatively fitted third sub-frame 163 and a fourth sub-frame 164 , and a detection electrode assembly and a reaction electrode assembly are arranged on the upper surface of the third sub-frame 163 ; and second side ears 161 are arranged on the outer sides of the third sub-frame 163 and the fourth sub-frame 164 .

[0083] It should be noted that the first sub-frame 153 and the second sub-frame 154 provided in the embodiment of the present invention are made of insulating materials, and the detection electrode assembly and the reaction electrode assembly are made of conductive materials. The detection electrode assembly and the reaction electrode assembly are glued to the first sub-frame 153 and the third sub-frame 163.

[0084] Furthermore, the first reaction electrode 11 and the first detection electrode 13 are located on the first sub-frame 153, the first wire 18, the second wire 19, and the third wire 20 are glued together with the second sub-frame 154, and the first pad 21, the second pad 22, and the third pad 23 are also glued to the second sub-frame 154, and the first sub-frame 153 is attached to the second sub-frame 154 to form a first frame 15.

[0085] The second detection electrode 14 and the second reaction electrode 12 are arranged on the upper surface of the third sub-frame 163, the fourth wire 24 and the fifth wire 25 are glued together with the fourth sub-frame 164, the fourth pad 26 and the fifth pad 27 are glued to the fourth sub-frame 164, and the third sub-frame 163 is attached to the fourth sub-frame 164 to form a second frame 16.

[0086] See also Figure 5 In an optional embodiment, the first end of the first sub-frame 153 has a first via hole 105, and the first side ear 151 on the outer side of the second sub-frame 154 is provided with a first solder pad hole 106, and the detection electrode assembly and the reaction electrode assembly are connected to the external device through the first via hole 105 and the first solder pad hole 106.

[0087] Furthermore, the number of the first pad holes 106 is set as required. For example, the number of the first pad holes 106 can be 2 or 3. The embodiment of the present invention does not limit the number of the first pad holes 106.

[0088] The first end of the third sub-frame 163 has a second via hole, and the second side ear on the outer side of the fourth sub-frame 164 is provided with a second pad hole, and the detection electrode assembly and the reaction electrode assembly are connected to the external device through the second via hole and the second pad hole.

[0089] Furthermore, the number of the second pad holes is set as required. For example, the number of the second pad holes can be 2 or 3. The embodiment of the present invention does not limit the number of the second pad holes.

[0090] In an optional embodiment, a first bridge 152 is provided at the center of the first sub-frame 153 and the second sub-frame 154;

[0091] The first bridge 152 is provided with a first reaction electrode 11 and a first detection electrode 13;

[0092] A second bridge 162 is provided at the center of the third sub-frame 163 and the fourth sub-frame 164; a second reaction electrode 12 and a second detection electrode 14 are provided on the second bridge 162;

[0093] The detection electrode assembly and the reaction electrode assembly are located on the first bridge 152 and the second bridge 162 .

[0094] In an optional embodiment, the potential sensor assembly 1 further includes a second frame assembly connecting circuit and a first frame assembly connecting circuit;

[0095] See also Figure 6 and Figure 7 The first frame component connection circuit includes a first wire 18, a second wire 19, a third wire 20, a first pad 21, a second pad 22 and a third pad 23; the first wire 18 is electrically connected to the first end of the second wire 19 and then connected to the first reaction electrode 11, the second end of the first wire 18 is connected to the first pad 21, the second end of the second wire 19 is connected to the second pad 22, the first end of the third wire 20 is connected to the first detection electrode, the second end of the third wire 20 is connected to the third pad 23, and the third wire 20 is insulated from the first wire 18 and the second wire 19;

[0096] See also Figure 8 and Fig. 9 The second frame component connection circuit includes a fourth wire 24, a fifth wire 25, a fourth pad 26 and a fifth pad 27. The first end of the fourth wire 24 is connected to the second reaction electrode 12, and the second end is connected to the fourth pad 26; the first end of the fifth wire 25 is connected to the second detection electrode, and the second end is connected to the fifth pad 27; the fourth wire 24 and the fifth wire 25 are insulated.

[0097] Based on the fuel cell frame structure and material, the present invention integrates an ultra-thin flexible film potential sensor into the fuel cell frame without significantly affecting the performance and structure of a single cell and a fuel cell stack.

[0098] In an optional embodiment, the first detection electrode 13, the second detection electrode 14, the first reaction electrode 11 and the second reaction electrode 12 are all platinum electrodes. The first detection electrode 13, the second detection electrode 14, the first reaction electrode 11 and the second reaction electrode 12 are mainly made of metal foil, preferably copper foil, and a platinum layer is provided on the outer surface and around the electrode.

[0099] Furthermore, the first detection electrode 13 is also called an anode potential detection electrode; and the second detection electrode 14 is also called a cathode potential detection electrode.

[0100] The surfaces of the first reaction electrode 11 and the second reaction electrode 12 react, wherein hydrogen evolution reaction occurs on the surface of the first reaction electrode 11 and oxygen evolution reaction occurs on the surface of the second reaction electrode 12, so they are both called reaction electrodes. Since hydrogen evolution reaction occurs on the surface of the first reaction electrode 11, it is called a dynamic hydrogen electrode.

[0101] Further, the first frame 15 and the second frame 16 are manufactured according to the structure of the potential sensor assembly 1 provided in the embodiment of the present invention, and after the first frame 15 and the second frame 16 are pressed and pasted, two frames with integrated potential sensors are obtained. The thickness of the first frame 15 and the second frame 16 is flexibly adjustable, and the specific thickness should be consistent with the conventional frame thickness of the fuel cell after pressing and pasting, so as to avoid significant impact on the structure and performance of the fuel cell.

[0102] A certain concentration of ionomer solution is coated on the upper surface of the first reaction electrode 11 of the first frame 15 and the upper surface of the first reaction electrode 11 of the second frame 16, and dried for later use. Figure 1 The membrane electrode 100 is placed on the upper surface of the first frame 15, and the second frame 16 is folded along the short side to cover the membrane electrode 100 to form a single cell.

[0103] Reference Figure 2 , a thin layer of ionomer is coated on the surface of the second reaction electrode 12, and the thin layer of ionomer is in contact with the surface of the cathode catalyst layer 102; a thin layer of ionomer is coated on the surface of the first reaction electrode 11, and the thin layer of ionomer is in contact with the surface of the anode catalyst layer 103; the first detection electrode 13 is in direct contact with the surface of the anode catalyst layer 103; the second detection electrode 14 is in contact with the surface of the cathode catalyst layer 102, as shown in the cross-sectional view Figure 2 shown.

[0104] When in use, a constant DC current or a constant DC voltage is applied between the first reaction electrode 11 and the second reaction electrode 12, the second reaction electrode 12 is connected to the positive pole of the DC power supply, and the first reaction electrode 11 is connected to the negative pole of the DC power supply. At this time, a hydrogen evolution reaction occurs on the surface of the first reaction electrode 11, so it is also called a reference electrode; an oxygen evolution reaction occurs on the surface of the second reaction electrode 12. The magnitude of the DC current and the DC voltage should be reasonably controlled. Too large or too small will lead to instability of the hydrogen evolution reaction and the oxygen evolution reaction.

[0105] Assuming the potential of the first reaction electrode 11 is 0V, the voltage between the first detection electrode 13 and the first reaction electrode 11 is collected by a voltage detection device to obtain the anode potential V1. The voltage between the second detection electrode 14 and the first reaction electrode 11 is collected by a voltage detection device to obtain the cathode potential V2.

[0106] The first detection electrode 13 and the second detection electrode 14 are used to detect the anode potential and the cathode potential respectively. The four platinum electrodes, the first reaction electrode 11, the first detection electrode 13, the second detection electrode 14 and the second reaction electrode 12, constitute a potential sensor group. By adjusting the position and length of the side ears and the bridge, the potential at any position of the membrane electrode 100 can be tested.

[0107] The above solution only arranges one potential sensor assembly 1 in the frame for the purpose of illustrating the technical solution. The actual arrangement position, quantity, and layout of the potential sensor group can be adjusted arbitrarily according to test requirements. Figure 1 A 3×2 arrangement is shown, that is, 3 potential sensor assemblies 1 are arranged in the length direction and 2 potential sensor assemblies 1 are arranged in the width direction, so that the cathode / anode potentials at six different positions can be tested simultaneously. The 3×2 arrangement is only shown as an example here, and it is not a limitation on the scope of protection.

[0108] The embodiments of the present disclosure have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A fuel cell potential distribution test device, characterized in that: The device comprises: The membrane electrode is composed of three parts: a proton membrane, a cathode catalyst layer and an anode catalyst layer. The upper and lower surfaces of the membrane electrode are the cathode catalyst layer and the anode catalyst layer respectively. at least one potential sensor assembly located on the upper and lower surfaces of the membrane electrode; The potential sensor assembly is used to detect the potential distribution of the membrane electrode; The potential sensor assembly includes a frame assembly, a detection electrode assembly and a reaction electrode assembly; The frame assembly is provided with the detection electrode assembly and the reaction electrode assembly; The frame assembly is disposed on both the upper and lower surfaces of the membrane electrode, and the membrane electrode is bonded to the detection electrode assembly and the reaction electrode assembly; The reaction electrode assembly comprises: a first reaction electrode and a second reaction electrode; The first reaction electrode is arranged on a side of the frame assembly that is attached to the membrane electrode. The second reaction electrode is arranged on the other side where the frame assembly and the membrane electrode are attached; The projections of the first reaction electrode and the second reaction electrode on a horizontal plane overlap; The detection electrode assembly includes a first detection electrode and a second detection electrode; The first detection electrode is arranged on a side of the frame assembly that is in contact with the membrane electrode. The second detection electrode is arranged on the other side where the frame assembly is attached to the membrane electrode; The projections of the first detection electrode and the second detection electrode on a horizontal plane overlap; The potential sensor assembly further includes a first frame assembly connecting circuit and a second frame assembly connecting circuit; The first frame component connection circuit includes a first wire, a second wire, a third wire, a first pad, a second pad and a third pad, the first wire is electrically connected to the first end of the second wire and then connected to the first reaction electrode, the second end of the first wire is connected to the first pad, the second end of the second wire is connected to the second pad, the first end of the third wire is connected to the first detection electrode, the second end is connected to the third pad, and the third wire is insulated from the first wire and the second wire; The second frame component connection circuit includes a fourth wire, a fifth wire, a fourth pad and a fifth pad, the first end of the fourth wire is connected to the second reaction electrode, and the second end is connected to the fourth pad; the first end of the fifth wire is connected to the second detection electrode, and the second end is connected to the fifth pad; the fourth wire is insulated from the fifth wire.

2. The device according to claim 1, characterized in that The frame assembly includes a first frame and a second frame, and the first frame and the second frame are arranged opposite to each other; The center positions of the opposite surfaces of the first frame and the second frame are both provided with a receiving groove; The detection electrode assembly and the reaction electrode assembly are arranged in the containing tank.

3. The device according to claim 2, characterized in that A first side ear is arranged on the outer side of the first frame, and a second side ear is arranged on the outer side of the second frame, and the projections of the first side ear and the second side ear overlap.

4. The device according to claim 3, characterized in that The first frame includes a first sub-frame and a second sub-frame that are relatively attached to each other, a detection electrode assembly and a reaction electrode assembly are arranged on the upper surface of the first sub-frame, and the first side ears are arranged on the outer sides of the first sub-frame and the second sub-frame; The second frame includes a relatively fitted third sub-frame and a fourth sub-frame, the upper surface of the third sub-frame is provided with a detection electrode assembly and a reaction electrode assembly; the outer sides of the third sub-frame and the fourth sub-frame are both provided with the second side ears.

5. The device according to claim 4, characterized in that A first via hole is disposed at the first end of the first sub-frame, a first pad hole is disposed on the first side ear on the outer side of the second sub-frame, and the detection electrode assembly and the reaction electrode assembly are connected to an external device through the first via hole and the first pad hole; The first end of the third sub-frame has a second via hole, the second side ear on the outer side of the fourth sub-frame is provided with a second pad hole, and the detection electrode assembly and the reaction electrode assembly are connected to external devices through the second via hole and the second pad hole.

6. The device according to claim 5, characterized in that A first bridge is formed between the first sub-frame and the second sub-frame at their centers; The third sub-frame and the fourth sub-frame have a second connecting bridge at their centers; The detection electrode assembly and the reaction electrode assembly are located on the first bridge and the second bridge.

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