Test fixture for fuel cell and test method for fuel cell stack

Abstract

The embodiment of the invention provides a test fixture of a fuel cell and a test method of a fuel cell stack. 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 invention 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 present invention relates to the technical field of batteries, and in particular to a test fixture for a fuel cell and a test method for a hydrogen fuel cell stack having the test fixture. Background Art

[0002] Proton exchange membrane fuel cells, hereinafter referred to as "fuel cells", mainly use hydrogen and oxygen (air) as anode and cathode reaction gases to generate electricity through electrochemical reactions. Fuel cells are power generation devices that directly convert chemical energy into electrical energy. Due to their environmental friendliness, high energy conversion efficiency, no noise and rapid response, they are considered to be one of the main development directions of future new energy power generation.

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

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, an embodiment of the present invention provides a test fixture for a fuel cell. The test fixture for a fuel cell can assist in the battery assembly to play a role of superior performance advantages to achieve precise control of the compression rate.

[0005] An embodiment of the present invention further provides a fuel cell stack testing method.

[0006] The test fixture of the fuel cell of the embodiment of the present invention comprises a first end plate, a second end plate, a first current collecting plate and a second current collecting plate, an adjusting member and a locking member. The first end plate and the second end plate are arranged at intervals 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 member abuts between the first end plate and the second end plate 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 member is passed through the first end plate and the second end plate to keep the first end plate and the second end plate in a locked position. Wherein, the stacking of multiple membrane electrodes forms the fuel cell body.

[0007] The fuel cell test fixture of the embodiment of the present invention can calculate the distance between the first end plate and the second end plate according to the preset compression rate R by setting an adjustment member between the first end plate and the second end plate, and adjust the length of the adjustment member because the adjustment member can abut between the first end plate and the second end plate, thereby obtaining a fuel cell body with a preset compression rate. When the preset compression rate is changed, it is only necessary to synchronously change the length of the adjustment member to achieve precise control of the membrane electrode compression rate. Therefore, the fuel cell test fixture of the present invention can achieve the purpose of verifying the corresponding different performances or finding the optimal performance by accurately adjusting the compression rate of the relevant components.

[0008] During the performance test, the obtained fuel cell body with different preset compression rates is tested, and the polarization curve performance, stack internal resistance and stack flow resistance under different assembly pressures are tested. 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 performs optimally. In addition, the assembly process of the fuel cell is simplified, the operation steps are clear, and the assembly efficiency can be significantly improved, which is suitable for mass production and small-batch trial production.

[0009] Therefore, the fuel cell test clamp of the embodiment of the present invention can assist the battery assembly to exert its superior performance advantages to achieve precise control of the compression rate.

[0010] 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 collecting 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 collecting plate.

[0011] In some embodiments, the first end plate has a first placement surface and a first connecting edge arranged around the first placement surface on its inner wall surface; the second end plate has a second placement surface and a second connecting edge arranged around the second placement surface on its inner wall surface, and the locking member is passed through the first connecting edge and the second connecting edge; the first placement surface has a first accommodating groove, the first insulating layer and the first current collecting plate are stacked in the first accommodating groove, the edges of the first insulating layer and the first current collecting plate are in contact with the inner circumference of the first accommodating groove, and one end of the adjusting member is in contact with the first connecting edge; the second placement surface has a second accommodating groove, the second insulating layer and the second current collecting plate are stacked in the second accommodating groove, the edges of the second insulating layer and the second current collecting plate are in contact with the inner circumference of the second accommodating groove, the other end of the adjusting member is in contact with the second connecting edge, and the two ends of the locking member are connected to the first connecting edge and the second connecting edge;

[0012] In some embodiments, the fuel cell test fixture further includes a positioning rod, and the first mounting surface, the first insulating layer, the second current collecting plate, the second current collecting plate, the second insulating layer and the second mounting surface all have corresponding positioning holes, and the positioning rod passes through the positioning hole.

[0013] In some embodiments, the adjusting member includes 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.

[0014] In some embodiments, a receiving hole is provided on the edge 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, the gasket is arranged in the receiving hole, and one end of the limiting rod extends into the receiving hole and the one end of the limiting rod abuts against the gasket.

[0015] In some embodiments, there are a plurality of gaskets, and the plurality of gaskets can be stacked in increasing or decreasing order in the receiving hole.

[0016] 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.

[0017] In some embodiments, the receiving hole is a special-shaped hole, and the cross-section of the limiting rod and each of the gaskets matches the shape and size of the receiving hole; and / or the thickness of the gasket is 0.1mm, 0.2mm, 0.5mm, 1mm m or 2mm.

[0018] In some embodiments, the first end plate layer and the second end plate layer are polygonal, and there are multiple locking members and multiple adjusting members, and the multiple adjusting members are arranged one by one on each edge of the first end plate and the second end plate, and the multiple locking members are arranged at intervals along the circumference of the test fixture.

[0019] The fuel cell stack testing method of the embodiment of the present invention adopts the fuel cell testing fixture described in any one of the above, and the testing method comprises the following steps:

[0020] A fuel cell body with a height of H is used, and a spacing between the first end plate and the second end plate required to be set under a preset compression rate R and a corresponding height of the adjusting member are calculated;

[0021] After adjusting the height of the adjusting member, the adjusting member is placed between the first end plate and the second end plate;

[0022] The fuel cell body is placed between the first current collecting plate and the second current collecting plate, and the locking member is adjusted until both ends of the adjusting member are respectively in contact with the first end plate and the second end plate, thereby obtaining a fuel cell body with a compression rate of R.

[0023] In some embodiments, the compression ratio R is calculated according to the following formula:

[0024]

[0025]

[0026] Where: L rod is the length of the limit 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 bipolar plate thickness; t GDL is the initial thickness of the gas diffusion layer; t collect is the thickness of the collector plate; t insulate is the thickness of the insulation board; t MEA is the initial thickness of the membrane electrode; t c is the thickness of the membrane electrode after compression. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 4 is a front view of a fuel cell test fixture according to an embodiment of the present invention.

[0028] Figure 2 FIG. 4 is a side view of a fuel cell test fixture according to an embodiment of the present invention.

[0029] Figure 3 4 is a perspective view of a fuel cell test fixture according to an embodiment of the present invention.

[0030] Figure 4 FIG. 4 is an exploded view of a fuel cell test fixture according to an embodiment of the present invention.

[0031] Figure 5 It is an exploded view of the cooperation between the first end plate, the second end plate and the regulating member of the fuel cell according to the embodiment of the present invention.

[0032] Figure 6 is a three-dimensional diagram of a gasket according to an embodiment of the present invention.

[0033] Reference numerals:

[0034] First end plate 1; first end plate layer 11; first insulating layer 12;

[0035] Second end plate 2; second end plate layer 21; receiving hole 120;

[0036] A second insulating layer 22;

[0037] First current collecting plate 3; lead pin 31;

[0038] The second current collecting plate 4;

[0039] Adjusting member 5; limiting rod 51; gasket 52;

[0040] Locking member 6;

[0041] Positioning hole 7. DETAILED DESCRIPTION

[0042] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0043] Reference below Figure 1-Figure 6 A fuel cell test fixture and a fuel cell stack test method according to an embodiment of the present invention are described.

[0044] The test fixture of the fuel cell of the embodiment of the present invention comprises a first end plate 1, a second end plate 2, a first current collecting plate 3 and a second current collecting plate 4, an adjusting member 5 and a locking member 6. The first end plate 1 and the second end plate 2 are arranged at intervals 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 opposite to each other 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 fitted with 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 member 5 is abutted between the first end plate 1 and the second end plate 2 to adjust the spacing between the first end plate 1 and the second end plate 2 according to the thickness of the fuel cell body, and the locking member 6 is passed through 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 a locked position. Among them, the stacking of multiple membrane electrodes forms the fuel cell body.

[0045] The fuel cell test fixture of the embodiment of the present invention can calculate the distance between the first end plate 1 and the second end plate 2 according to the preset compression rate R by setting the adjustment member 5 between the first end plate 1 and the second end plate 2, and adjust the length of the adjustment member 5 because the adjustment member 5 can abut between the first end plate 1 and the second end plate 2, so as to obtain a fuel cell body with a preset compression rate. When the preset compression rate is changed, the precise control of the membrane electrode compression rate can be achieved by synchronously changing the length of the adjustment member 5. Therefore, the fuel cell test fixture of the present invention can achieve the purpose of verifying the corresponding different performances or finding the optimal performance by accurately adjusting the compression rate of the relevant components.

[0046] During the performance test, the obtained fuel cell body with different preset compression rates is tested, and the polarization curve performance, stack internal resistance and stack flow resistance under different assembly pressures are tested. 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 performs optimally. In addition, the assembly process of the fuel cell is simplified, the operation steps are clear, and the assembly efficiency can be significantly improved, which is suitable for mass production and small-batch trial production.

[0047] Therefore, the fuel cell test clamp of the embodiment of the present invention can assist the battery assembly to exert its superior performance advantages to achieve precise control of the compression rate.

[0048] like Figure 3 and Figure 4As shown, the first end plate 1 includes 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 collecting plate 3; the second end plate 2 includes 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 collecting plate 4. It can be understood that the first end plate layer 11, the first insulating layer 12 and the first current collecting 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 collecting plate 4 are sequentially arranged along the stacking direction. When in use, the first insulating layer 12 is sandwiched between the first end plate layer 11 and the first current collecting plate 3, and the second insulating layer 22 is sandwiched between the second end plate layer 21 and the second current collecting plate 4.

[0049] The fuel cell test fixture of the embodiment of the present invention divides the first end plate 1 into a first end plate layer 11 and a first insulating layer 12, and the second end plate 2 into a second end plate layer 21 and a second insulating layer 22. The insulating layer has the advantage of high safety performance.

[0050] like Figure 3 As 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 passes through the first connecting edge and the second connecting edge. The fuel cell test fixture of the embodiment of the present invention also includes a positioning rod, and the first placement surface and the second placement surface both have corresponding positioning holes 7, and the positioning rod passes through the positioning hole 7.

[0051] The test fixture of the fuel cell of the embodiment of the present invention can prevent the first current collecting plate 3 and the second current collecting plate 4 from shifting by passing the positioning rod through the first end plate 1, the first current collecting plate 3, the second current collecting plate 4 and the second end plate 2. Therefore, the test fixture of the fuel cell has the advantages of simple structure and good structural stability.

[0052] The embodiments of the present invention are not limited to this. For example, 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 stacked in the first accommodating groove, the edges of the first insulating layer 12 and the first current collecting plate 3 are in contact with the inner circumferential surface of the first accommodating groove, one end of the adjusting member 5 abuts against 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 stacked in the second accommodating groove, the edges of the second insulating layer 22 and the second current collecting plate 4 are in contact with the inner circumferential surface of the second accommodating groove, the other end of the adjusting member 5 abuts against the second connecting edge, and the locking member 6 is passed through the first connecting edge and the second connecting edge.

[0053] The test fixture of the fuel cell of the embodiment of the present invention can limit the first insulating layer 12 and the first current collecting plate 3 by stacking the first insulating layer 12 and the first current collecting plate 3 in the first receiving groove on the first end plate 1; similarly, the second insulating layer 22 and the second current collecting plate 4 are stacked in the second receiving groove to limit the second insulating layer 22 and the second current collecting plate 4. Therefore, the test fixture of the fuel cell has the advantages of simple structure and good structural stability.

[0054] Furthermore, the locking member 6 can be a bolt. For example, insert 16 M8 full-thread bolts around the end plate to ensure that the bolts are aligned with the holes of the upper and lower end plates. Use a torque wrench to gradually tighten the bolts in a diagonal order to ensure uniform force.

[0055] Tighten in stages: 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 limit rod is firmly connected to the upper and lower end plates to achieve precise compression of the membrane electrode.

[0056] like Figure 5 and Figure 6 As shown, the adjusting member 5 includes a gasket 52 and a limiting rod 51, and the gasket 52 is arranged 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 arranged on the limiting rod 51 and the first end plate 1; or the gasket 52 can be arranged on the limiting rod 51 and the second end plate 2; or, the gasket 52 can be arranged on the limiting rod 51 and the first end plate 1 and the second end plate 2.

[0057] The fuel cell test fixture of the embodiment of the present invention divides the adjustment member 5 into a gasket 52 and a limiting rod 51, and the gasket 52 is arranged 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 the adjustment member 5 can be changed by the gasket 52, so that the fuel cell body with different compression rates can be obtained during assembly. Therefore, the fuel cell test fixture has the advantages of simple structure and high convenience in operation.

[0058] like Figure 3 and Figure 5 As shown, a receiving hole 120 is provided 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, a gasket 52 is disposed 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.

[0059] The fuel cell test fixture of the embodiment of the present invention is provided with a 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 to receive the gasket 52, and the limiting rod 51 is inserted into the receiving hole 120. When the test assembly is performed, the stability of the test fixture is improved during the assembly process, and the displacement problem of the limiting rod 51 is prevented. Therefore, the fuel cell test fixture has the advantages of simple structure and good structural stability.

[0060] The receiving hole 120 is a blind hole or a stepped hole. Therefore, the fuel cell test fixture of the embodiment of the present invention has the advantage of a simple structure.

[0061] The gasket 52 is an alloy steel gasket 52 or a ceramic gasket 52. The use of the alloy steel gasket 52 or the ceramic gasket 52 can further ensure the consistency of the membrane electrode compression rate and improve the performance and reliability of the fuel cell body.

[0062] There are multiple gaskets 52, and the multiple gaskets 52 can be stacked in the receiving hole 120 in an increasing or decreasing manner. Thus, a test fixture with different first end plates 1 and second end plates 2 can be obtained, and a fuel cell body with different compression rates can be obtained. The test fixture of the fuel cell improves its application range.

[0063] Furthermore, the plurality of gaskets 52 may be gaskets 52 of different thicknesses, thereby obtaining a fuel cell body with more compression ratios. Thus, the test fixture has the advantages of strong adaptability and high adjustment flexibility.

[0064] The thickness of the gasket 52 is 0.1 mm, 0.2 mm, 0.5 mm, 1 mm or 2 mm, thereby obtaining a fuel cell body with a greater compression rate. Therefore, the test fixture has the advantages of strong adaptability and high adjustment flexibility.

[0065] like Figures 1 to 5 As shown, the first end plate layer 11 and the second end plate layer 21 are polygonal, there are multiple locking members 6 and adjusting members 5, the multiple adjusting members 5 are at least 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. Therefore, the test fixture of the fuel cell has the advantages of simple structure and good stability.

[0066] The first current collecting plate 3 and the second current collecting plate 4 are both provided with lead pins 31, so as to facilitate electrical connection with the outside for measuring the performance of the fuel cell body.

[0067] The fuel cell test fixture of the embodiment of the present invention has a plurality of locking members 6 and adjusting members 5. Therefore, the fuel cell test fixture has the advantage of good structural stability.

[0068] The fuel cell stack testing method of the embodiment of the present invention adopts any one of the fuel cell testing fixtures described above; the fuel cell stack testing method comprises the following steps:

[0069] A fuel cell body with a height of H is used, and the height at a preset compression ratio R is calculated;

[0070] After adjusting the height of the adjusting member 5, place it between the first end plate 1 and the second end plate 2;

[0071] The fuel cell body is placed between the first current collecting plate 3 and the second current collecting plate 4, and the distance between the first current collecting plate 3 and the second current collecting plate 4 is adjusted until both ends of the adjusting member 5 are respectively in contact with the first end plate 1 and the second end plate 2 to obtain a fuel cell body with a compression rate of R.

[0072] The fuel cell stack testing method of the embodiment of the present invention can guide the fuel cell to exert optimal performance, improve the assembly efficiency, assembly consistency and adaptability of the fuel cell body, and reduce production costs.

[0073] The compression ratio R is calculated according to the following formula:

[0074]

[0075]

[0076] Where: L rod is the length of the limit 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 bipolar plate thickness; t GDL is the initial thickness of the gas diffusion layer; t collect is the thickness of the collector plate; t insulate is the thickness of the insulation board; t MEA is the initial thickness of the membrane electrode; t c is the thickness of the membrane electrode after compression.

[0077] Record the measurement data, calculation results, and gasket 52 parameters in the assembly report for quality control and traceability. Connect the test equipment to measure the voltage, current and other parameters of the fuel cell body to verify whether its performance meets the design requirements.

[0078] The fuel cell stack testing method of the embodiment of the present invention does not require a large press or a special fixture, and can be assembled using conventional tools, thereby reducing equipment investment and maintenance costs. The assembly process is simplified, the operation steps are clear, and the assembly efficiency can be significantly improved, which is suitable for mass production and small-batch trial production. As a result, the assembly efficiency is improved, and the operation is simple and cost-effective.

[0079] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0080] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0081] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0082] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0083] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. 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 invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0084] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A fuel cell test fixture, characterized in that: A plurality of membrane electrodes are stacked to form a fuel cell body, and the test fixture comprises: A first end plate and a second end plate, wherein the first end plate and the second end plate are arranged at intervals along a stacking direction of the membrane electrode; a first current collecting plate and a second current collecting plate, wherein the first current collecting plate is disposed on the first end plate, and the second current collecting plate is disposed on the second end plate, and the first current collecting plate and the second current collecting plate can be attached to the fuel cell body; an adjusting member, the adjusting member abutting between the first end plate and the second end plate to adjust the distance between the first end plate and the second end plate according to the thickness of the fuel cell body; A locking member is passed through the first end plate and the second end plate to keep the first end plate and the second end plate in a locked position.

2. The fuel cell test fixture according to claim 1, characterized in that: The first end plate includes a first end plate layer and a first insulating layer, wherein the first insulating layer is spaced between the first end plate layer and the first current collecting plate; the second end plate includes a second end plate layer and a second insulating layer, wherein the second insulating layer is spaced between the second end plate layer and the second current collecting plate.

3. The fuel cell test fixture according to claim 2, characterized in that: The first end plate has a first placement surface and a first connecting edge arranged around the first placement surface on its inner wall surface; the second end plate has a second placement surface and a second connecting edge arranged around the second placement surface on its inner wall surface, and the locking member is inserted through the first connecting edge and the second connecting edge; The first placement surface has a first receiving groove, the first insulating layer and the first current collecting plate are stacked in the first receiving groove, the edges of the first insulating layer and the first current collecting plate are in contact with the inner circumference of the first receiving groove, and one end of the adjusting member is in contact with the first connecting edge; The second placement surface has a second accommodating groove, the second insulating layer and the second current collecting plate are stacked in the second accommodating groove, the edges of the second insulating layer and the second current collecting plate are in contact with the inner circumference of the second accommodating groove, the other end of the adjusting member is in contact with the second connecting edge, and the two ends of the locking member are connected to the first connecting edge and the second connecting edge; Or, it also includes a positioning rod, the first placement surface, the first insulating layer, the second current collecting plate, the second current collecting plate, the second insulating layer and the second placement surface all have correspondingly arranged positioning holes, and the positioning rod passes through the positioning hole.

4. The fuel cell test fixture according to claim 3, characterized in that: The adjusting member includes 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.

5. The fuel cell test fixture according to claim 4, characterized in that: An accommodating hole is provided on the edge 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, the gasket is arranged in the accommodating hole, and one end of the limiting rod extends into the accommodating hole and the one end of the limiting rod abuts against the gasket.

6. The fuel cell test fixture according to claim 5, characterized in that: There are a plurality of gaskets, and the plurality of gaskets can be stacked in the receiving hole in an increasing or decreasing manner.

7. The fuel cell test fixture according to claim 6, characterized in that: The receiving hole is a blind hole or a stepped hole; and / or the gasket is an alloy steel gasket or a ceramic gasket; And / or, the accommodating hole is a special-shaped hole, and the cross-section of the limiting rod and each of the gaskets matches the shape and size of the accommodating hole; and / or, the thickness of the gasket is 0.1mm, 0.2mm, 0.5mm, 1mm or 2mm.

8. The fuel cell test fixture according to claim 2, characterized in that: The first end plate layer and the second end plate layer are polygonal, and there are multiple locking members and multiple adjusting members. The multiple adjusting members are at least arranged on the opposite edges of the first end plate and the second end plate, and the multiple locking members are arranged at intervals along the circumference of the test fixture.

9. A fuel cell stack testing method, characterized in that: Using the fuel cell test fixture described in any one of claims 1 to 8, the test method comprises the following steps: A fuel cell body with a height of H is used, and a spacing between the first end plate and the second end plate required to be set under a preset compression rate R and a corresponding height of the adjusting member are calculated; After adjusting the height of the adjusting member, the adjusting member is placed between the first end plate and the second end plate; The fuel cell body is placed between the first current collecting plate and the second current collecting plate, and the locking member is adjusted until both ends of the adjusting member are respectively in contact with the first end plate and the second end plate, thereby obtaining a fuel cell body with a compression rate of R.

10. The fuel cell stack testing method according to claim 9, characterized in that: The compression ratio R is calculated according to the following formula: Where: L rod is the length of the limit rod; m is the number of gaskets; t shim is the gasket thickness; n is the number of membrane electrodes in the fuel cell body; t bip is the bipolar plate thickness; t GDL is the initial thickness of the gas diffusion layer; t collect is the thickness of the collector plate; t insulate is the thickness of the insulation board; t MEA is the initial thickness of the membrane electrode; t c is the thickness of the membrane electrode after compression.

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