Test fixture of fuel cell

Abstract

The embodiment of the utility model provides a test fixture for a fuel cell. The test fixture of the fuel cell comprises a first end plate, a second end plate, a first collector plate, a second collector plate, an adjusting piece and a locking piece. The first end plate and the second end plate are arranged at an interval along the lamination direction of membrane electrodes, the first collector plate is arranged on the first end plate, the second collector plate is arranged on the second end plate, and the adjusting piece is abutted between the first end plate and the second end plate. The first end plate and the second end plate are arranged on the fuel cell body so as to adjust the distance between the first end plate and the second end plate according to the thickness of the fuel cell body, and the locking piece penetrates through the first end plate and the second end plate so as to be used for keeping the first end plate and the second end plate at a locking position. Therefore, the test clamp of the fuel cell provided by the embodiment of the utility model can assist the cell assembly to play a role of excellent performance advantages by accurately adjusting the compression ratio of related components.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery technical field, concretely relates to a test fixture of fuel cell. BACKGROUND

[0002] Proton exchange membrane fuel cell, hereinafter referred to as "fuel cell". Fuel cell mainly uses hydrogen and oxygen (air) as anode and cathode reaction gas, generates electric energy through electrochemical reaction, and directly converts chemical energy into power generation device, because of its environmental friendliness, high energy conversion efficiency, no noise and rapid response, etc. It is considered as one of the main development directions of future new energy power generation.

[0003] In fuel cell stack, fuel cell body includes membrane electrode three-in-one assembly (MEA) and bipolar plate, which is the core component of fuel cell, and the matching relationship of the two determines the sealing performance and internal resistance performance of the stack assembly, so the compression force applied to the stack needs to be accurately controlled within a certain range to achieve the optimal compression rate of the membrane electrode. When the fuel cell stack is assembled, the contact state inside the fuel cell stack is usually ensured by the relationship between the preset compression rate and the contact resistance, but due to the diversity of the sealing structure of the stack and the change of the pressure in the assembly process. When the compression rate is too high, it may cause deformation or even damage of MEA and bipolar plate, thereby affecting the performance and life of the battery; when the compression rate is too low, the contact between MEA and bipolar plate is insufficient, the internal resistance of the stack increases, and there is a problem of poor battery performance. SUMMARY

[0004] The utility model aims at at least in certain extent solves one of the technical problems in the related art. For this purpose, the embodiment of the utility model proposes a test fixture of fuel cell. The test fixture of fuel cell can assist the battery assembly to play the role of superior performance advantage, so as to realize the accurate control of compression rate.

[0005] The test fixture of fuel cell of the utility model embodiment includes first end plate, second end plate, first current collecting plate and second current collecting plate, adjusting part and locking part. The first end plate and the second end plate are spaced apart along the stacking direction of the membrane electrode, the first current collecting plate is arranged on the first end plate, the second current collecting plate is arranged on the second end plate, the first current collecting plate and the second current collecting plate can be fitted with the fuel cell body, the adjusting part is abutted between the first end plate and the second end plate, so as to adjust the spacing between the first end plate and the second end plate according to the thickness of the fuel cell body, and the locking part is threaded on the first end plate and the second end plate to keep the first end plate and the second end plate in the locking position. Wherein, the stacking of multiple membrane electrodes forms the fuel cell body.

[0006] The utility model discloses fuel cell's test fixture of an embodiment, through setting the adjusting member between first end plate and second end plate, can according to preset compression rate R, the interval between first end plate and second end plate is calculated, and the length of adjusting member is adjusted, because adjusting member can butt in between first end plate and second end plate, thereby obtains the fuel cell body of predetermined preset compression rate. When changing preset compression rate, only need to change the length of adjusting member simultaneously can realize the accurate control of membrane electrode compression rate. Therefore, the fuel cell test fixture of the utility model can accurately adjust the compression rate of relevant components, and the purpose of verifying the different performance corresponding or finding the optimal performance is achieved.

[0007] During performance test, the obtained fuel cell body of different preset compression rates is tested, and the polarization curve performance, stack internal resistance and stack flow resistance under different assembly pressures. In this way, the optimal polarization curve performance, stack internal resistance and stack flow resistance of the membrane electrode compression rate can be obtained through direct testing, to guide the compression rate during the installation of the fuel cell, and ensure that the fuel cell stack can exert the optimal performance. Moreover, the fuel cell assembly process is simplified, the operation steps are clear, the assembly efficiency can be significantly improved, and the fuel cell test fixture is suitable for batch production and small batch trial production.

[0008] Therefore, the fuel cell test fixture of the utility model embodiment can assist the battery assembly to exert the superior performance advantage, to realize the accurate control of the compression rate.

[0009] In some embodiments, the first end plate includes a first end plate layer and a first insulating layer, and the first insulating layer is spaced between the first end plate layer and the first current collector plate; the second end plate includes a second end plate layer and a second insulating layer, and the second insulating layer is spaced between the second end plate layer and the second current collector plate.

[0010] In some embodiments, the inner wall surface of the first end plate has a first mounting surface and a first connecting edge arranged around the first mounting surface; the inner wall surface of the second end plate has a second mounting surface and a second connecting edge arranged around the second mounting surface, and the locking member is arranged on the first connecting edge and the second connecting edge; the first mounting surface has a first receiving groove, and the first insulating layer and the first current collector plate are arranged in the first receiving groove, and the edges of the first insulating layer and the first current collector plate are fitted with the inner circumferential surface of the first receiving groove, and one end of the adjusting member is butted against the first connecting edge; the second mounting surface has a second receiving groove, and the second insulating layer and the second current collector plate are arranged in the second receiving groove, and the edges of the second insulating layer and the second current collector plate are fitted with the inner circumferential surface of the second receiving groove, and the other end of the adjusting member is butted against the second connecting edge, and the two ends of the locking member are connected to the first connecting edge and the second connecting edge;

[0011] In some embodiments, the test fixture for fuel cell further comprises a positioning rod, the first installation surface, the first insulation layer, the first current collector plate, the second current collector plate, the second insulation layer and the second installation surface are provided with corresponding positioning holes, and the positioning rod is inserted into the positioning holes.

[0012] In some embodiments, the adjusting member comprises a gasket and a limiting rod, and the gasket is arranged between the limiting rod and at least one of the first end plate and the second end plate.

[0013] In some embodiments, edges of at least one of the first connecting edge of the first end plate layer and the second connecting edge of the second end plate layer are provided with receiving holes, the gasket is arranged in the receiving hole, one end of the limiting rod is inserted into the receiving hole, and the one end of the limiting rod is in abutment with the gasket.

[0014] In some embodiments, the gasket has a plurality of gaskets, and the plurality of gaskets are arranged in the receiving hole in an increasing or decreasing manner.

[0015] In some embodiments, the receiving hole is a blind hole or a stepped hole; and / or, the gasket is an alloy steel gasket or a ceramic gasket.

[0016] In some embodiments, the receiving hole is a special-shaped hole, the cross section of the limiting rod and each of the gaskets are matched with the shape and size of the receiving hole; and / or, the thickness of the gasket is 0.1mm, 0.2mm, 0.5mm, 1mm or 2mm.

[0017] In some embodiments, the first end plate layer and the second end plate layer are polygonal, the locking member and the adjusting member have a plurality of adjusting members, the plurality of adjusting members are arranged on each edge of the first end plate and the second end plate in a one-to-one correspondence, and the plurality of locking members are arranged at intervals along the circumference of the test fixture. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 FIG. 1 is a front view of a test fixture for fuel cell according to an embodiment of the present application.

[0019] Figure 2 FIG. 1 is a front view of a test fixture for fuel cell according to an embodiment of the present application.

[0020] Figure 3 FIG. 1 is a front view of a test fixture for fuel cell according to an embodiment of the present application.

[0021] Figure 4 FIG. 1 is a front view of a test fixture for fuel cell according to an embodiment of the present application.

[0022] Figure 5 is an assembly drawing of the first end plate, the second end plate and the adjusting piece of the fuel cell.

[0023] Figure 6 is a perspective view of the gasket.

[0024] Reference signs:

[0025] The first end plate 1; the first end plate layer 11; the first insulation layer 12;

[0026] The second end plate 2; the second end plate layer 21; the accommodating hole 120;

[0027] The second insulation layer 22;

[0028] The first current collecting plate 3; the lead pin 31;

[0029] The second current collecting plate 4;

[0030] The adjusting piece 5; the limiting rod 51; the gasket 52;

[0031] The locking piece 6;

[0032] The positioning hole 7. DETAILED DESCRIPTION

[0033] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the drawings. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0034] The following refers to Figures 1-6 The test fixture of the fuel cell of the embodiments of the present application is described.

[0035] The test fixture of the fuel cell of the embodiments of the present application comprises the first end plate 1, the second end plate 2, the first current collecting plate 3 and the second current collecting plate 4, the adjusting piece 5 and the locking piece 6. The first end plate 1 and the second end plate 2 are arranged in a spaced manner along the stacking direction of the membrane electrode (it can be understood that the first end plate 1 and the second end plate 2 are arranged in a relative manner along the stacking direction of the membrane electrode), the first current collecting plate 3 is arranged on the first end plate 1, the second current collecting plate 4 is arranged on the second end plate 2, the first current collecting plate 3 and the second current collecting plate 4 can be attached to the fuel cell body (it can be understood that the first current collecting plate 3 is arranged on the side of the first end plate 1 facing the second end plate 2, and the second current collecting plate 4 is arranged on the side of the second end plate 2 facing the first end plate 1), the adjusting piece 5 is abutted between the first end plate 1 and the second end plate 2 to adjust the distance between the first end plate 1 and the second end plate 2 according to the thickness of the fuel cell body, and the locking piece 6 is threaded on the first end plate 1 and the second end plate 2 to keep the first end plate 1 and the second end plate 2 in the locked position. Among them, the stacking of the plurality of membrane electrodes forms the fuel cell body.

[0036] The test fixture of the fuel cell can adjust the length of the adjusting piece 5 according to the preset compression rate R, calculate the spacing between the first end plate 1 and the second end plate 2, and obtain the fuel cell body with the predetermined preset compression rate by adjusting the length of the adjusting piece 5. When the preset compression rate is changed, the length of the adjusting piece 5 is changed synchronously, and the accurate control of the membrane electrode compression rate is realized. Therefore, the fuel cell test fixture can accurately adjust the compression rate of the related components, and the purpose of verifying the corresponding different performance or finding the optimal performance is achieved.

[0037] During performance testing, the obtained fuel cell bodies with different preset compression rates are tested, and the polarization curve performance, the stack internal resistance and the stack flow resistance under different assembly pressures are tested. In this way, the optimal polarization curve performance, the stack internal resistance and the stack flow resistance of the membrane electrode compression rate can be obtained by direct testing, so as to guide the compression rate during the installation of the fuel cell, and ensure that the fuel cell stack can exert the optimal performance. Moreover, the assembly process of the fuel cell is simplified, the operation steps are clear, the assembly efficiency can be significantly improved, and the fuel cell is suitable for batch production and small-batch trial production.

[0038] Therefore, the test fixture of the fuel cell can assist the battery assembly to exert the superior performance advantage, and the accurate control of the compression rate is realized.

[0039] As shown in Figure 3 and Figure 4 The first end plate 1 comprises a first end plate layer 11 and a first insulating layer 12, and the first insulating layer 12 is spaced between the first end plate layer 11 and the first current collector plate 3. The second end plate 2 comprises a second end plate layer 21 and a second insulating layer 22, and the second insulating layer 22 is spaced between the second end plate layer 21 and the second current collector plate 4. It can be understood that the first end plate layer 11, the first insulating layer 12 and the first current collector plate 3 are sequentially arranged along the stacking direction, and the second end plate layer 21, the second insulating layer 22 and the second current collector plate 4 are sequentially arranged along the stacking direction. In use, the first insulating layer 12 is clamped between the first end plate layer 11 and the first current collector plate 3, and the second insulating layer 22 is clamped between the second end plate layer 21 and the second current collector plate 4.

[0040] The test fixture of the fuel cell can adjust the length of the adjusting piece 5 according to the preset compression rate R, calculate the spacing between the first end plate 1 and the second end plate 2, and obtain the fuel cell body with the predetermined preset compression rate by adjusting the length of the adjusting piece 5. When the preset compression rate is changed, the length of the adjusting piece 5 is changed synchronously, and the accurate control of the membrane electrode compression rate is realized. Therefore, the fuel cell test fixture can accurately adjust the compression rate of the related components, and the purpose of verifying the corresponding different performance or finding the optimal performance is achieved.

[0041] As shown in Figure 3As shown, the inner wall surface of the first end plate 1 has a first placement surface and a first connecting edge arranged around the first placement surface; the inner wall surface of the second end plate 2 has a second placement surface and a second connecting edge arranged around the second placement surface, and the locking member 6 is arranged on the first connecting edge and the second connecting edge. The test fixture of the fuel cell further comprises a positioning rod, the first placement surface and the second placement surface are provided with corresponding positioning holes 7, and the positioning rod is arranged in the positioning holes 7.

[0042] The test fixture of the fuel cell has the advantages of simple structure and good structural stability.

[0043] In other embodiments, the inner wall surface of the first end plate 1 has a first placement surface and a first connecting edge arranged around the first placement surface; the inner wall surface of the second end plate 2 has a second placement surface and a second connecting edge arranged around the second placement surface; the first placement surface has a first accommodating groove, the first insulating layer 12 and the first current collecting plate 3 are arranged in the first accommodating groove, the edges of the first insulating layer 12 and the first current collecting plate 3 are attached to the inner wall surface of the first accommodating groove, one end of the adjusting member 5 is in abutment with the first connecting edge, the first placement surface has a second accommodating groove, the second insulating layer 22 and the second current collecting plate 4 are arranged in the second accommodating groove, the edges of the second insulating layer 22 and the second current collecting plate 4 are attached to the inner wall surface of the second accommodating groove, the other end of the adjusting member 5 is in abutment with the second connecting edge, and the locking member 6 is arranged on the first connecting edge and the second connecting edge.

[0044] The test fixture of the fuel cell has the advantages of simple structure and good structural stability.

[0045] Further, the locking member 6 can be a bolt. For example, 16 M8 full thread bolts are inserted around the periphery, and the bolts are aligned with the hole positions of the upper and lower end plates. A torque wrench is used to tighten the bolts in diagonal order step by step to ensure uniform stress

[0046] Staged tightening: initial tightening: first tighten to 50% of the design torque. Secondary tightening: tighten to 75% of the design torque. Final tightening: tighten to 100% of the design torque to ensure that the limiting rod is stably connected to the upper and lower end plates, and the membrane electrode is precisely compressed.

[0047] As Figure 5 and Figure 6 shown, the adjusting piece 5 includes a gasket 52 and a limiting rod 51, the gasket 52 is padded between the limiting rod 51 and at least one of the first end plate 1 and the second end plate 2. It can be understood that the gasket 52 can be padded on the limiting rod 51 and the first end plate 1; or the gasket 52 can be padded on the limiting rod 51 and the second end plate 2; or, the gasket 52 can be padded on the limiting rod 51 and the first end plate 1 and the second end plate 2.

[0048] The test fixture of the fuel cell of the utility model embodiment, through the adjusting piece 5 is divided into gasket 52 and limiting rod 51, gasket 52 is padded between the limiting rod 51 and at least one of the first end plate 1 and the second end plate 2, the overall length of adjusting piece 5 can be changed by the gasket 52 set, and then the fuel cell body of different compression rates is obtained when assembling. Therefore, the test fixture of the fuel cell has the advantages of simple structure and high operation convenience.

[0049] As Figure 3 and Figure 5 shown, the edge of at least one of the first connecting edge of the first end plate layer 11 and the second connecting edge of the second end plate layer 21 is provided with a receiving hole 120, the gasket 52 is arranged in the receiving hole 120, and one end of the limiting rod 51 extends into the receiving hole 120 and abuts against the gasket 52. It can be understood that the height of the gasket 52 is less than the depth of the receiving hole 120.

[0050] The test fixture of the fuel cell of the utility model embodiment, by being provided with the receiving hole 120 on the edge of at least one of the first connecting edge of the first end plate layer 11 and the second connecting edge of the second end plate layer 21, for accommodating the gasket 52, and the limiting rod 51 is deeply inserted into the receiving hole 120, when testing and assembling, the stability of the test fixture in the assembling process is improved, and the problem of displacement of the limiting rod 51 is prevented. Therefore, the test fixture of the fuel cell has the advantages of simple structure and good structural stability.

[0051] The receiving hole 120 is a blind hole or a stepped hole. Therefore, the test fixture of the fuel cell of the utility model embodiment has the advantage of simple structure.

[0052] The gasket 52 is an alloy steel gasket 52 or a ceramic gasket 52. Using the alloy steel gasket 52 or the ceramic gasket 52 can further ensure the consistency of the membrane electrode compression rate, improve the performance and reliability of the fuel cell body.

[0053] The gaskets 52 are provided in multiple numbers, and the multiple gaskets 52 can be stacked in the accommodating hole 120 in a number-variable manner. Thus, test fixtures of different first end plates 1 and second end plates 2 can be obtained, and fuel cell bodies of different compression rates can be obtained. The test fixture of the fuel cell improves the range of application thereof.

[0054] Further, the multiple gaskets 52 can be gaskets 52 of different thicknesses. Thus, fuel cell bodies of more compression rates can be obtained. Thus, the test fixture has the advantages of strong adaptability and high adjustment flexibility.

[0055] The thickness of the gaskets 52 is 0.1 mm, 0.2 mm, 0.5 mm, 1 mm or 2 mm. Thus, fuel cell bodies of more compression rates can be obtained. Thus, the test fixture has the advantages of strong adaptability and high adjustment flexibility.

[0056] As shown in Figures 1 to 5 The first end plate layer 11 and the second end plate layer 21 are polygonal, the locking members 6 and the adjusting members 5 are provided in multiple numbers, the multiple adjusting members 5 are correspondingly arranged on the opposite edges of the first end plate 1 and the second end plate 2, and the multiple locking members 6 are arranged at intervals along the circumference of the test fixture. Thus, the test fixture of the fuel cell has the advantages of simple structure and good stability.

[0057] The first bus plate 3 and the second bus plate 4 are both provided with lead pins 31. Thus, the electrical connection with the outside for measuring the performance of the fuel cell body is facilitated.

[0058] The test fixture of the fuel cell of the embodiment of the utility model has the advantage of good structural stability.

[0059] The test method of the fuel cell stack of the embodiment of the utility model adopts the test fixture of the fuel cell of any one of the above; the test method of the fuel cell stack comprises the following steps:

[0060] The height of the fuel cell body is H, and the height under the preset compression rate R is calculated;

[0061] The adjusting member 5 is placed between the first end plate 1 and the second end plate 2 after the height of the adjusting member 5 is adjusted;

[0062] The fuel cell body is placed between the first bus plate 3 and the second bus plate 4, the distance between the first bus plate 3 and the second bus plate 4 is adjusted, until the two ends of the adjusting member 5 abut against the first end plate 1 and the second end plate 2 respectively, and the fuel cell body with the compression rate R is obtained.

[0063] The test method of the fuel cell stack can guide the fuel cell to exert optimal performance, improves the fuel cell body assembling efficiency, assembling consistency and adaptability, and reduces the production cost.

[0064] The compression ratio R is calculated according to the following formula:

[0065]

[0066] Wherein: L rod is the length of the limiting rod; m is the number of gaskets; t shim is the thickness of the gasket; n is the number of membrane electrodes in the fuel cell body; t bip is the thickness of the bipolar plate; t GDL is the initial thickness of the gas diffusion layer; t collect is the thickness of the current collector plate; t insulate is the thickness of the insulating plate; t MEA is the initial thickness of the membrane electrode; t c is the thickness of the compressed membrane electrode.

[0067] The measurement data, calculation results and gasket 52 parameters are recorded in the assembly report, so as to facilitate quality control and traceability.

[0068] The test method of the fuel cell stack of the embodiment of the utility model does not need large press or special fixture, and can complete the assembly by using conventional tools, so as to reduce equipment investment and maintenance cost.

[0069] In the description of the utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0070] In addition, the terms "first", "second", "third", etc. are used herein only to describe different instances, and are not to be construed as indicating or implying relative importance or a specific number of the technical features indicated. Therefore, the features defined as "first", "second", etc. can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0071] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication or interaction relationship of two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0072] In the present application, unless otherwise specifically defined and limited, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features can be in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0073] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean 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. In the description, the illustrative description of the above terms is not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in the present application and the features of different embodiments or examples without contradiction.

[0074] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be construed as limiting the present application. Those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A test fixture for a fuel cell, characterized by, A plurality of membrane-electrode layers are stacked to form a fuel cell body, and the test jig comprises: a first end plate and a second end plate, the first end plate and the second end plate being spaced apart along a stacking direction of the membrane-electrode layers; a first current collector plate and a second current collector plate, the first current collector plate being disposed on the first end plate, and the second current collector plate being disposed on the second end plate, the first current collector plate and the second current collector plate being capable of being fitted to the fuel cell body; an adjusting member abutting between the first end plate and the second end plate to adjust a spacing between the first end plate and the second end plate according to a thickness of the fuel cell body; a locking member being threaded on the first end plate and the second end plate to maintain the first end plate and the second end plate in a locked position.

2. The test jig for the fuel cell according to claim 1, wherein the first end plate comprises a first end plate layer and a first insulating layer, the first insulating layer being spaced apart between the first end plate layer and the first current collector plate; and the second end plate comprises a second end plate layer and a second insulating layer, the second insulating layer being spaced apart between the second end plate layer and the second current collector plate.

3. The test fixture for fuel cells of claim 2, wherein, an inner wall surface of the first end plate has a first seating surface and a first connecting edge being annularly disposed around the first seating surface; and an inner wall surface of the second end plate has a second seating surface and a second connecting edge being annularly disposed around the second seating surface, the locking member being threaded on the first connecting edge and the second connecting edge; the first seating surface has a first receiving groove, the first insulating layer and the first current collector plate being stacked in the first receiving groove, edges of the first insulating layer and the first current collector plate being fitted to an inner peripheral surface of the first receiving groove, one end of the adjusting member abutting against the first connecting edge; the second seating surface has a second receiving groove, the second insulating layer and the second current collector plate being stacked in the second receiving groove, edges of the second insulating layer and the second current collector plate being fitted to an inner peripheral surface of the second receiving groove, the other end of the adjusting member abutting against the second connecting edge, both ends of the locking member being connected to the first connecting edge and the second connecting edge; or, further comprising a positioning rod, the first seating surface, the first insulating layer, the first current collector plate, the second current collector plate, the second insulating layer and the second seating surface each having a corresponding positioning hole, the positioning rod being threaded in the positioning holes.

4. The test fixture for fuel cells of claim 3, wherein the adjusting member comprises a gasket and a limiting rod, the gasket being disposed between the limiting rod and at least one of the first end plate and the second end plate.

5. The test fixture for fuel cells of claim 4, wherein, at least one of edges of the first connecting edge of the first end plate layer and the second connecting edge of the second end plate layer has a receiving hole, the gasket being disposed in the receiving hole, and one end of the limiting rod being inserted into the receiving hole and abutting against the gasket.

6. The test fixture for fuel cells of claim 5, wherein, the gasket has a plurality of gaskets, the plurality of gaskets being capable of being stacked in the receiving hole in an increasing or decreasing manner.

7. The test jig for the fuel cell according to claim 6, wherein The accommodating hole is a blind hole or a stepped hole; and / or, the gasket is an alloy steel gasket or a ceramic gasket.

8. The test fixture of claim 6, wherein, The accommodating hole is a special-shaped hole, and the cross section of the limiting rod and each of the gaskets match the shape and size of the accommodating hole.

9. The test fixture for fuel cells of claim 6, wherein, The thickness of the gasket is 0.1 mm, 0.2 mm, 0.5 mm, 1 mm or 2 mm.

10. The test fixture for fuel cells of claim 2, wherein, The first end plate layer and the second end plate layer are polygonal, the locking members and the adjusting members are multiple, multiple adjusting members are arranged on at least opposite edges of the first end plate and the second end plate, and multiple locking members are arranged at intervals along the circumference of the test fixture.

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