Electric pile cell testing device

Abstract

The invention discloses an electric pile cell testing device, relates to the technical field of fuel cells, and solves the problem that a simulation test effect is not accurate enough due to mutual influence and mutual heat transfer among a plurality of flow field plates in the prior art. The stack cell testing device comprises a plurality of power generation unit testing devices and a cooling plate. The plurality of power generation unit testing devices are stacked in sequence. The cooling plate is arranged between two adjacent power generation unit testing devices. Wherein a cooling flow channel is formed in the cooling plate, and a cooling inlet and a cooling outlet which are communicated with the cooling flow channel are formed in the cooling plate. The electric pile cell testing device can fully cool the two adjacent power generation unit testing devices.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cells, and in particular to a stack battery testing device. Background Art

[0002] With the continuous advancement of technology and the continuous improvement of living standards, cars have become the main means of transportation for daily families. Among them, electric vehicles have gradually become the mainstream choice of people due to their advantages such as no pollution, low cost, beautiful appearance and high intelligence. In electric vehicles, batteries are the source of power drive, and the vehicle is driven by converting electrical energy into mechanical energy. Among them, a fuel cell is a battery that can convert chemical energy into electrical energy, generally including a membrane electrode and a cathode plate and an anode plate located on both sides of the membrane electrode. Flow channels are formed on the cathode plate and the anode plate, and the fuel, oxidant, coolant and products generated during the reaction of the fuel cell can be distributed and transmitted in the flow channel.

[0003] The performance and life of the above-mentioned fuel cell are closely related to the flow channels on the cathode plate and the anode plate. The performance and service life of the fuel cell can be improved by designing the flow channels. In order to design a good flow channel, a corresponding test device is generally designed to design the flow channel, and the effect of the flow channel in the simulation device is verified to determine whether the design of the flow channel meets the requirements. For example, CN218769635U provides a fuel cell visualization test device, including a transparent end plate with a boss structure and a metal flow field plate with a hollow flow channel structure. The boss structure of the transparent end plate and the hollow flow channel structure of the metal flow field plate are combined to form a visualized fuel cell end plate and flow field structure; the surface of the transparent end plate is processed with a boss structure, and the introduction of the boss structure can effectively block the mutual flow of water between different flow channels, and can truly and accurately reflect the water distribution of the fuel cell. CN110518270B discloses a fuel cell single cell test fixture, including a stamped metal plate, the stamped metal plate includes a bridge area, an S-shaped flow channel area and a sealing gasket area, there are two bridge areas, which are respectively arranged at the two ends of the S-shaped flow channel area, and the two bridge areas are connected through the S-shaped flow channel area, the sealing gasket area is located on the periphery of the bridge area and the S-shaped flow channel area, and the bridge area and the S-shaped flow channel area are provided with metal protrusions on the periphery, and the metal protrusions separate the bridge area and the S-shaped flow channel area from the sealing gasket area. According to the fuel cell single cell test fixture of the present application, the metal plate stack can be effectively tested.

[0004] However, in the process of testing multiple sets of electrode combinations simultaneously, due to the end effect and the mutual influence between the multiple flow field plates of the test device, the heat will be transferred to each other, resulting in poor consistency and inaccurate simulation test results. Summary of the invention

[0005] One of the purposes of the present invention is to provide a battery stack test device to solve the problem of inaccurate simulation test results caused by mutual influence and heat transfer between multiple flow field plates in the prior art.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] The embodiment of the present application provides a battery stack test device, including a plurality of power generation unit test devices and a cooling plate. The plurality of power generation unit test devices are stacked in sequence. The cooling plate is arranged between two adjacent power generation unit test devices. A cooling channel is formed inside the cooling plate, and a cooling inlet and a cooling outlet connected to the cooling channel are provided.

[0008] The battery stack test device provided in the embodiment of the present application has a cooling plate disposed between the multiple power generation unit test devices. During the simulation test, the coolant can enter the cooling channel through the cooling inlet, and then flow out through the cooling outlet after heat exchange. In this way, the heat generated by the adjacent power generation unit test devices can be absorbed by the coolant inside the cooling plate, so that the heat generated by the adjacent power generation unit test devices will not interfere with the test of the adjacent power generation unit test devices, thereby ensuring the stability of the simulation effect.

[0009] In a possible embodiment, the cooling plate includes a cooling plate body and a cover plate. A cooling channel is formed on one side of the cooling plate body, and a cooling inlet and a cooling outlet connected to the cooling channel are provided. The cover plate is arranged on one side of the cooling plate body where the cooling channel is located, is connected to the cooling plate body, and covers the cooling channel.

[0010] According to the above-mentioned technical means, the cooling plate provided in the embodiment of the present application can be arranged between adjacent power generation unit test devices. Since the cover plate is arranged on the side where the cooling channel of the cooling plate body is located, it is connected to the cooling plate body and covers the cooling channel. In this way, the coolant can flow from the cooling inlet into the cooling channel and finally flow out from the cooling outlet. At the same time, the coolant in the cooling channel can perform heat exchange and absorb the heat generated by the adjacent power generation unit test devices, thereby avoiding the mutual influence between the heat generated by the adjacent power generation unit test devices and ensuring the test effect of the power generation unit test device.

[0011] In a possible embodiment, the cooling plate body has a third surface, a fourth surface and a cooling peripheral wall. The third surface and the fourth surface are arranged relatively spaced apart. The cooling peripheral wall is located between the third surface and the fourth surface and is arranged around the periphery of the third surface and the fourth surface. A cooling flow channel is formed on the third surface. The cooling peripheral wall is provided with a cooling inlet and a cooling outlet.

[0012] According to the above technical means, since the cooling inlet and the cooling outlet are arranged on the cooling peripheral wall of the cooling plate body, in actual application, the connecting pipe can be directly connected to the cooling inlet and the cooling outlet from the peripheral side of the cooling plate body, which is more convenient and will not be affected by other components.

[0013] In a possible embodiment, the cooling peripheral wall includes two first cooling peripheral walls and two second cooling peripheral walls. The two first cooling peripheral walls are arranged relative to each other at intervals along the first direction, and the two second cooling peripheral walls are located between the two first cooling peripheral walls, and the two ends are respectively connected to the two first cooling peripheral walls. The two second cooling peripheral walls are arranged relative to each other at intervals along the second direction. The first direction and the second direction are perpendicular to each other, and the two ends of the cooling flow channel are arranged at intervals along the first direction. A cooling inlet is provided on one first cooling peripheral wall, and a cooling outlet is provided on the other first cooling peripheral wall.

[0014] According to the above technical means, since the two ends of the cooling channel are spaced apart along the first direction, the cooling inlet can be connected to one end of the cooling channel, and the cooling outlet can be connected to the other end of the cooling channel. In this way, the coolant can flow through the cooling channel better, so that the coolant can more fully exchange heat and ensure heat exchange efficiency.

[0015] In a possible implementation manner, the cooling inlet and the cooling outlet are staggered along the second direction.

[0016] According to the above technical means, in actual application, the width direction of the cooling plate body can be parallel to the vertical direction, so that the coolant entering from the cooling inlet can smoothly flow out from the cooling outlet under the action of gravity, ensuring the conveying effect.

[0017] In a possible embodiment, there are multiple cooling channels. The multiple cooling channels are arranged along the second direction. A first cooling distribution groove and a second cooling distribution groove are formed on the third surface. The cooling inlet is connected to the first cooling distribution groove, and the cooling outlet is connected to the second cooling distribution groove. Along the first direction, the first cooling distribution groove and the second cooling distribution groove are respectively located on both sides of the cooling channel. One end of the multiple cooling channels is connected to the first cooling distribution groove, and the other end is connected to the second cooling distribution groove.

[0018] According to the above technical means, the coolant can enter different cooling channels through the first cooling distribution groove, and converge into the second cooling distribution groove, and flow out from the cooling outlet. At the same time, the first cooling distribution groove and the second cooling distribution groove are directly connected to multiple cooling channels, which can make the distribution more uniform, so that the material flowing in each cooling channel is more uniform, avoiding the problem of uneven distribution when distributing separately.

[0019] In a possible implementation, along a direction perpendicular to the fourth surface, the bottom of the first cooling distribution groove and the bottom of the second cooling distribution groove are both located on a side of the bottom of the cooling channel close to the fourth surface.

[0020] According to the above technical means, the coolant can flow into the first cooling distribution groove or the second cooling distribution groove better, so that the coolant can flow out completely and smoothly, avoiding the temperature of the coolant in the cooling channel from gradually increasing over time.

[0021] In a possible embodiment, a cooling inlet channel and a cooling outlet channel are formed inside the cooling plate body. One end of the cooling inlet channel is connected to the cooling inlet, and the other end is connected to the bottom of the first distribution groove. One end of the cooling outlet channel is connected to the cooling outlet, and the other end is connected to the bottom of the second cooling distribution groove.

[0022] According to the above technical means, the coolant entering from the cooling inlet can flow into the first cooling distribution groove through the cooling inlet channel. Similarly, the coolant in the second cooling distribution groove can flow to the cooling outlet through the cooling outlet channel. At the same time, since the other end of the cooling inlet channel is connected to the bottom of the first cooling distribution groove, the other end of the cooling outlet channel is connected to the bottom of the second cooling distribution groove. In this way, when the coolant flows into the first cooling distribution groove or the second cooling distribution groove, it can better flow to the cooling inlet through the cooling inlet channel, or better flow to the cooling outlet through the cooling outlet channel, avoiding liquid accumulation in the first cooling distribution groove and the second cooling distribution groove.

[0023] In a possible embodiment, the cooling inlet channel includes a first inlet channel and a second inlet channel that are interconnected. One end of the first inlet channel is connected to the cooling inlet, and the other end is connected to one end of the second inlet channel. The other end of the second inlet channel extends in a direction perpendicular to the fourth surface and is connected to the bottom of the first cooling distribution groove. The cooling outlet channel includes a first outlet channel and a second outlet channel that are interconnected. One end of the first outlet channel is connected to the cooling outlet, and the other end is connected to one end of the second outlet channel. The other end of the second outlet channel extends in a direction perpendicular to the fourth surface and is connected to the bottom of the first cooling distribution groove.

[0024] According to the above technical means, through the interconnected first inlet channel and the second inlet channel, the coolant can first enter the second inlet channel through the first inlet channel. Since the second inlet channel extends in a direction perpendicular to the fourth surface, the coolant can enter from the bottom of the first cooling distribution groove through the second inlet channel. Through the interconnected first outlet channel and the second outlet channel, the coolant can first enter the second outlet channel from the bottom of the second cooling groove, then enter the first outlet channel connected to the second outlet channel, and finally flow out from the cooling outlet.

[0025] In a possible implementation manner, a flow groove is formed on one side of the cover plate close to the cooling plate body. The flow groove and the cooling channel are arranged opposite to each other and are connected to each other.

[0026] According to the above technical means, by setting flow grooves on the cover plate, the flow rate of the coolant in the cooling plate can be increased, so that the coolant can better exchange heat and ensure the heat exchange effect.

[0027] In a possible implementation, the third surface is provided with a first connection hole, the cover plate is provided with a second connection hole, and the cooling plate further comprises a fastener, which is inserted into the second connection hole and extends into the first connection hole to be connected with the first connection hole.

[0028] According to the above technical means, the cooling plate body and the cover plate can be connected to each other by fasteners. For example, the fasteners can be bolts.

[0029] In a possible implementation, the cooling plate further comprises a sealing ring. The sealing ring is arranged on the third surface and connected to the cooling plate body. The sealing ring is located at the periphery of the cooling channel and is arranged around the periphery of the cooling channel. The cover plate is arranged on the sealing ring and abuts against the sealing ring.

[0030] According to the above technical means, the sealing ring can play a sealing effect, thereby ensuring that the coolant in the cooling channel is not easy to flow out from the gap between the cover plate and the cooling plate body, thereby avoiding safety hazards caused by coolant leakage.

[0031] In a possible implementation, the stack battery testing device further includes a first pipeline and a second pipeline. The first pipeline has a plurality of first branches, and the second pipeline has a plurality of second branches. One first branch is connected to a cooling inlet, and one second branch is connected to a cooling outlet.

[0032] According to the above technical means, by connecting multiple first branches and multiple second branches to the cooling inlet and the cooling outlet respectively, the flow of the coolant in different cooling plates can be ensured to be relatively uniform, thereby ensuring the cooling effect of each cooling plate.

[0033] In a possible embodiment, the stack battery test device further includes a third pipeline, a fourth pipeline, a fifth pipeline and a sixth pipeline. The power generation unit test device includes a membrane electrode and a flow field plate arranged on both sides of the membrane electrode. The flow field plate has an inlet and an outlet. The outlets of some flow field plates are respectively connected to a third branch, and the inlets of some flow field plates are respectively connected to a fourth branch. The outlets of another part of the flow field plates are respectively connected to a fifth branch, and the inlets of another part of the flow field plates are respectively connected to a sixth branch.

[0034] According to the above technical means, the inlet and outlet of the flow field plate can independently allow the medium to flow in or out, thereby ensuring uniform flow distribution.

[0035] In a possible implementation, the stack battery testing device further includes a plurality of control valves. The plurality of first branches, second branches, third branches, fourth branches, fifth branches, and sixth branches may be provided with control valves.

[0036] According to the above technical means, the flow of the medium passing through the first branch, the second branch, the third branch, the fourth branch, the fifth branch and the sixth branch can be adjusted by the control valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A schematic diagram of the structure of a battery stack test device provided in an embodiment of the present application;

[0038] Figure 2 A schematic diagram of the structure of another battery stack test device provided in an embodiment of the present application;

[0039] Figure 3 A schematic diagram of the structure of a flow field plate provided in an embodiment of the present application;

[0040] Figure 4 A side view of a flow field plate provided in an embodiment of the present application;

[0041] Figure 5 A top view of a flow field plate provided in an embodiment of the present application;

[0042] Figure 6 A top view of another flow field plate provided in an embodiment of the present application;

[0043] Figure 7 A cross-sectional view of a flow field plate provided in an embodiment of the present application;

[0044] Figure 8 A rear view of a flow field plate provided in an embodiment of the present application;

[0045] Fig. 9 A schematic diagram of the structure of another flow field plate provided in an embodiment of the present application;

[0046] Fig.10 A schematic diagram of the structures of various flow channels provided in the embodiments of the present application;

[0047] Fig.11 It is a schematic diagram of the local structure when the flow field plate and the membrane electrode are matched;

[0048] Fig.12 A schematic diagram of the structure of a cooling plate provided in an embodiment of the present application;

[0049] Fig.13 A side view of a cooling plate body provided in an embodiment of the present application;

[0050] Fig.14 A top view of a cooling plate body provided in an embodiment of the present application;

[0051] Fig.15 A partial cross-sectional view of a cooling plate body provided in an embodiment of the present application;

[0052] Fig.16 It is the flow deviation line graph of different flow channel shapes;

[0053] Fig.17 It is a line graph when there are different compression amounts between the flow field plate and the membrane electrode;

[0054] Fig.18 It is a line graph of output performance of two sets of bipolar plate power generation devices and two sets of power generation unit test devices;

[0055] Fig.19 The simulation results and measured results of current density under equal voltage are shown in the figure;

[0056] Fig. 20 A simulation diagram of current partition detection of a flow field plate provided in an embodiment of the present application.

[0057] Among them, 100-battery stack test device; 10-power generation unit test device; 11-flow field plate; 111-first surface; 1111-flow channel; 1112-first distribution groove; 1113-second distribution groove; 1114-sealing groove; 1115-first sub-surface; 1116-second sub-surface; 1117-flow channel ridge; 1118-insulating resin; 1119-depression area; 112-peripheral wall; 1121-first peripheral wall; 1122-second peripheral wall; 113-inlet; 1131-inlet channel; 114-outlet; 1141-outlet channel; 115-temperature measuring hole; 116-positioning hole; 117-mounting hole; 12-membrane electrode; 121-carbon paper area; 122-frame area; 20-end plate; 30-insulating plate; 4 0-heating rod; 50-collecting plate; 60-connecting piece; 70-cooling plate; 71-cooling plate body; 711-cooling channel; 712-cooling inlet; 713-cooling outlet; 714-third surface; 7141-first cooling distribution groove; 7142-second cooling distribution groove; 715-cooling peripheral wall; 7151-first cooling peripheral wall; 7152-second cooling peripheral wall; 716-cooling inlet channel; 7161-first inlet channel; 7162-second inlet channel; 717-cooling outlet channel; 718-first connecting hole; 72-cover plate; 721-second connecting hole; 73-sealing ring; 81-first pipeline; 82-second pipeline; 83-third pipeline; 84-fourth pipeline; 85-fifth pipeline; 86-sixth pipeline. DETAILED DESCRIPTION

[0058] The following will describe the embodiments of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention, not for limiting the scope of protection of the present invention.

[0059] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0060] At present, the development of new energy vehicles is becoming more and more rapid, and the proportion of new energy vehicles in the market is also increasing. Among them, batteries are the main components of new energy vehicles, which can provide a power source for new energy vehicles. The stored electrical energy can provide a power source for the drive motor, which in turn enables the drive motor to drive the new energy vehicle to operate.

[0061] Fuel cells are a type of battery commonly used in new energy vehicles that can convert chemical energy into electrical energy. Fuel cells generally include a membrane electrode and a cathode plate and an anode plate disposed on both sides of the membrane electrode. Among them, the surface of the cathode plate and the anode plate close to the membrane electrode is formed with a flow channel, which can be used to circulate the reacting gas, oxidant, coolant, and water generated during the reaction.

[0062] The design of the flow channel has a great influence on the performance and service life of the fuel cell. Therefore, in order to test the design effect of the flow channel, a simulation device is generally set up to simulate the cathode plate and the anode plate, and the corresponding flow channels are designed on the simulated cathode plate and the anode plate for verification, and then the effect of the flow channel actually applied to the cathode plate and the anode plate of the fuel cell is judged.

[0063] It is known that the length of the flow channel in the reaction zone of the automotive fuel cell stack is 200-400mm, and most simulation devices only reflect the local flow channel characteristics and cannot reflect the mass transfer characteristics of the entire flow channel; in addition, in order to send the substances that need to react into the flow channel and send the substances generated during the reaction out of the flow channel, the cathode plate and the anode plate are respectively provided with an inlet and an outlet connected to the flow channel. In the related art, the inlet and outlet on the flow channel plate of the simulated cathode plate and anode plate are generally arranged on the surface of the flow channel plate away from the membrane electrode. However, in actual applications, the surface of the cathode plate and the anode plate away from the membrane electrode is generally provided with an end plate. In this way, when the inlet and outlet on the cathode plate and the anode plate are connected by an external pipeline, the external pipeline will be affected by the end plate, which is inconvenient to connect with the inlet and outlet, and the installation and disassembly are not very convenient. At the same time, in the related art, in the process of testing multiple sets of plate combinations at the same time, due to the end effect and the mutual influence between the multiple flow field plates of the test device, the heat will be transferred to each other, resulting in poor consistency and inaccurate simulation test results.

[0064] Based on this, the present application embodiment provides a battery stack battery testing device, such as Figure 1 As shown, Figure 1A schematic diagram of the structure of a stack battery test device 100 provided in an embodiment of the present application, the stack battery test device 100 may include a power generation unit test device 10 and an end plate 20. Among them, an end plate 20 is respectively provided on both sides of the power generation unit test device 10. The power generation unit test device 10 can be used to test the flow channel performance of the cathode plate and the anode plate in the fuel cell. The end plate 20 can play a role in fixing the power generation unit test device 10, so that the power generation unit test device 10 can remain stable for better testing. At the same time, the end plate 20 can protect the power generation unit test device 10.

[0065] Continue to refer to Figure 1 The stack battery test device 100 may further include an insulating plate 30. The insulating plate 30 is disposed between the power generation unit test device 10 and the end plate 20. The insulating plate 30 may play an insulating role, ensure electrical insulation performance, and improve the safety performance of the stack battery test device 100.

[0066] In addition, in order to provide heat to the power generation unit test device 10, the battery stack test device 100 may further include a heating rod 40. The heating rod 40 may be powered to generate heat so that the power generation unit test device 10 can obtain the required temperature environment. Figure 1 As shown, the end plate 20 may be provided with a hole, and the heating rod 40 may be inserted into the hole of the end plate 20, so that the heating rod 40 can remain stable and provide heat for the power generation unit testing device 10. Figure 1 The stack battery testing device 100 may further include a current collecting plate 50. The current collecting plate 50 is disposed on a side of the flow field plate 11 away from the membrane electrode 12, and may play a role in current collection.

[0067] As can be seen from the above, the end plates 20 on both sides of the power generation unit test device 10 can play a role in fixing the power generation unit test device 10. In order to make the end plates 20 on both sides play a better role in fixing, as shown in FIG. Figure 1 As shown, the stack battery test device 100 provided in the embodiment of the present application may further include a connector 60. The connector 60 may penetrate the end plates 20 on both sides of the power generation unit test device 10 and be threadedly connected to the end plates 20 on both sides. In this way, the end plates 20 on both sides may be connected by the connector 60, thereby keeping the power generation unit test device 10 between the two end plates 20 stable.

[0068] For example, Figure 1 As shown, the connecting member 60 may be a bolt. At the same time, the number of bolts may be multiple, and the multiple bolts may be located on the peripheral side of the power generation unit test device 10 and arranged at intervals around the peripheral side of the power generation unit test device 10. In this way, the end plates 20 on both sides may be better connected by multiple bolts, and the connection may be more secure.

[0069] In some embodiments, Figure 2 As shown, Figure 2 A structural schematic diagram of another battery stack battery test device 100 provided in an embodiment of the present application, wherein the number of power generation unit test devices 10 may be multiple. Multiple power generation unit test devices 10 are stacked in sequence. Two end plates 20 are arranged on both sides of the multiple power generation unit test devices 10. In this way, different power generation unit test devices 10 can be tested at the same time through multiple power generation unit test devices 10, and the test results of multiple power generation unit test devices 10 can be obtained at one time, which makes the test efficiency higher. At the same time, since the fuel cell stack structure is generally provided with multiple power generation units. Therefore, by providing multiple power generation unit test devices 10, the actual application scenario can be better simulated.

[0070] like Figure 2 As shown, in some embodiments, the stack battery test device 100 may further include a cooling plate 70. The cooling plate 70 may be disposed between two adjacent power generation unit test devices 10. By providing the cooling plate 70, the cooling plate 70 may play a role in isolating heat, thereby preventing the heat generated by adjacent power generation unit test devices 10 from affecting each other, making the test results more accurate.

[0071] Next, the power generation unit testing device 10 provided in the embodiment of the present application is further introduced. Figure 1 As shown, the power generation unit test device 10 may include a flow field plate 11 and a membrane electrode 12. A flow field plate 11 is provided on both sides of the membrane electrode 12, and a flow channel 1111 is formed on the surface of the flow field plate 11 close to the membrane electrode 12. The reducing agent (fuel gas), oxidant, coolant required for the reaction, and water generated during the reaction can flow through the flow channel 1111.

[0072] Among them, the membrane electrode 12 may include a proton exchange membrane, a catalyst layer and a gas diffusion layer. The proton exchange membrane can transfer protons while preventing the straight-line flow of electrons. A catalyst layer is provided on both sides of the proton exchange membrane. The catalyst layer can play a catalytic role. Exemplarily, the catalyst layer can be made of platinum material, which can promote the process of hydrogen decomposition into protons and electrons, and promote the combination of oxygen and protons to form water.

[0073] The gas diffusion layer can be disposed on the side of the catalyst layer away from the proton exchange membrane. The gas diffusion layer can be used to make the gas flow to the surface of the catalyst layer in a uniform and dispersed manner. At the same time, the gas diffusion layer can also discharge the generated water and heat. Exemplarily, the gas diffusion layer can be a porous structure, and the gas can diffuse from the porous structure of the diffusion layer, thereby making the gas evenly distributed.

[0074] The flow field plates 11 on both sides of the membrane electrode 12 can simulate the cathode plate and the anode plate of the fuel cell. The structures of the two flow field plates 11 can be the same or different. The flow field plates 11 provided in the embodiment of the present application are further described by way of example. Figure 3 As shown, Figure 3 The schematic diagram of the structure of a flow field plate 11 provided in an embodiment of the present application, the flow field plate 11 may include a plate body. The plate body has a first surface 111, a second surface (not shown in the figure) and a peripheral wall 112. The first surface 111 and the second surface are arranged relatively spaced apart. The first surface 111 is formed with a flow channel 1111. In this way, in practical applications, the first surface 111 can be connected to the membrane electrode 12 ( Figure 2 ) on one side thereof, the reducing agent (fuel gas), oxidizing agent, coolant required for the reaction, as well as water generated during the reaction and other substances can flow in or out through the flow channel 1111 of the first surface 111.

[0075] like Figure 3 and Figure 4 As shown, Figure 4 A side view of a flow field plate 11 provided in an embodiment of the present application, wherein a peripheral wall 112 is located between a first surface 111 and a second surface, and is arranged around the periphery of the first surface 111 and the second surface. The peripheral wall 112 is provided with an inlet 113 and an outlet 114. The inlet 113 and the outlet 114 are both connected to the flow channel 1111. In this way, since the inlet 113 and the outlet 114 are arranged on the peripheral wall 112 of the plate body, in actual application, the connecting pipeline can be directly connected to the inlet 113 and the outlet 114 from the peripheral side of the plate body, and the connection is more convenient and will not be affected by other components (such as the end plate 20 or the cooling plate 70).

[0076] Therefore, in the flow field plate 11 provided in the embodiment of the present application, during the actual application, the flow channel 1111 of the first surface 111 can be in contact with the surface of one side of the membrane electrode 12, and the oxidant (fuel gas), oxidant, coolant and water generated by the reaction required for the reaction can flow in or out through the flow channel 1111 of the first surface 111. At the same time, since the peripheral wall 112 of the plate body is provided with an inlet 113 and an outlet 114, during the actual application, the connecting pipeline can be directly connected to the inlet 113 and the outlet 114 from the peripheral side of the plate body, and the connection is more convenient and will not be affected by other components (such as the end plate 20 or the cooling plate 70).

[0077] In order to facilitate the connection between the inlet 113 and the outlet 114 and the connecting pipe, illustratively, the inlet 113 and the outlet 114 can be threaded holes so as to be threaded with the connecting pipe for better connection and fixation.

[0078] In some embodiments, Figure 3 As shown, the peripheral wall 112 includes two first peripheral walls 1121 and two second peripheral walls 1122. The two first peripheral walls 1121 are spaced apart along the first direction X. The two second peripheral walls 1122 are located between the two first peripheral walls 1121, and the two ends are respectively connected to the two first peripheral walls 1121. The two second peripheral walls 1122 are spaced apart along the second direction Y.

[0079] Among them, the first direction X and the second direction Y are perpendicular to each other. The two ends of the flow channel 1111 are spaced apart along the first direction X. An inlet 113 is provided on one first peripheral wall 1121, and an outlet 114 is provided on the other first peripheral wall 1121. Since the two ends of the flow channel 1111 are spaced apart along the first direction X, the inlet 113 can be connected to one end of the flow channel 1111, and the outlet 114 can be connected to the other end of the flow channel 1111. In this way, the gas, oxidant, coolant and other substances required for the reaction can flow better through various positions of the flow channel 1111, and then can pass through the flow channel 1111 more evenly into the membrane electrode 12 to perform a good chemical reaction.

[0080] For example, Figure 3 As shown, the plate body as a whole can be roughly in the shape of a cuboid, and the two first peripheral walls 1121 can be distributed along the length direction of the plate body. The two second peripheral walls 1122 can be distributed along the width direction of the flow field plate 11. In this way, the inlet 113 and the outlet 114 are respectively located at the two ends of the length direction of the plate body, and the flow channel 1111 is also extended along the length direction of the plate body, which can ensure the length of the flow channel 1111.

[0081] For example, the length of the plate body can be 250 mm to 400 mm, and further, the length of the plate body can be 300 mm to 400 mm. The width of the plate body can be 50 mm to 150 mm, and further, the width of the plate body can be 100 mm to 150 mm. The thickness of the plate body can be 20 mm to 35 mm, and further, the thickness of the plate body can be 20 mm to 30 mm.

[0082] In some embodiments, the inlet 113 and the outlet 114 can be staggered along the second direction Y. Based on this, during the actual application of the flow field plate 11, the width direction of the plate body can be parallel to the vertical direction. In this way, the gas, oxidant, coolant required for the reaction entering from the inlet 113 and the water and other substances generated by the reaction can flow out smoothly from the outlet 114 under the action of gravity to ensure the transportation effect. It can be understood that the inlet 113 is above the outlet 114 in actual application to achieve the effect of using gravity to improve the transportation effect. Of course, in other embodiments, the inlet 113 and the outlet 114 can also be relatively arranged, and the positions of the inlet 113 and the outlet 114 can be specifically designed according to actual conditions.

[0083] In some embodiments, the number of flow channels 1111 may be multiple. Figure 5 As shown, Figure 5 This is a top view of a flow field plate 11 provided in an embodiment of the present application. A plurality of flow channels 1111 are arranged along the second direction Y. The first surface 111 is formed with a first distribution groove 1112 and a second distribution groove 1113. The inlet 113 ( Figure 4 ) is connected to the first distribution groove 1112, and the outlet 114 ( Figure 3 ) is connected to the second distribution groove 1113. Along the first direction, the first distribution groove 1112 and the second distribution groove 1113 are respectively located on both sides of the plurality of flow channels 1111. One end of the plurality of flow channels 1111 is connected to the first distribution groove 1112, and the other end is connected to the second distribution groove 1113.

[0084] Thus, the gas, oxidant, coolant and water generated by the reaction required for the reaction can enter different flow channels 1111 through the first distribution groove 1112, and converge into the second distribution groove 1113, and flow out from the outlet 114. At the same time, the first distribution groove 1112 and the second distribution groove 1113 are directly connected to the multiple flow channels 1111, so that the distribution can be more uniform, and the substances flowing in each flow channel 1111 can be more uniform, avoiding the problem of uneven distribution when multiple flow channels 1111 are distributed separately. Among them, when the number of flow channels 1111 is small, the distribution can be more uniform. Of course, in other embodiments, the multiple flow channels 1111 can also be connected to the inlet 113 or the outlet 114 through multiple connecting grooves.

[0085] In some embodiments, along the direction perpendicular to the first surface 111, the bottom of the first distribution groove 1112 and the bottom of the second distribution groove 1113 can be located at the bottom of the flow channel 1111 on the side close to the second surface. In this way, during the reaction, the liquid (e.g., water) in the reaction process can flow into the first distribution groove 1112 or the second distribution groove 1113 better, thereby avoiding the water generated by the reaction from gathering inside the flow channel 1111. Exemplarily, the height difference between the bottom of the first distribution groove 1112 and the second distribution groove 1113 and the bottom of the flow channel 1111 can be 1mm-2mm. For example, the height difference between the bottom of the first distribution groove 1112 and the second distribution groove 1113 and the bottom of the flow channel 1111 can be 1mm.

[0086] It can be understood that when the bottom of the first distribution groove 1112 and the bottom of the second distribution groove 1113 are both located on the side of the bottom of the flow channel 1111 away from the second surface, a portion of the liquid in the flow channel 1111 may be blocked by the groove walls of the first distribution groove 1112 and the second distribution groove 1113, and only the portion of the liquid in the flow channel 1111 that is higher than the first distribution groove 1112 and the second distribution groove 1113 can flow into the first distribution groove 1112 or the second distribution groove 1113 well.

[0087] In some embodiments, Figure 5 and Figure 6 As shown, Figure 6 FIG. 1 is a top view of another flow field plate 11 provided in an embodiment of the present application. An inlet channel 1131 and an outlet channel 1141 are formed inside the plate body. One end of the inlet channel 1131 is connected to the inlet 113 ( Figure 4 ) and the other end is connected to the bottom of the first distribution groove 1112. One end of the outlet channel 1141 is connected to the outlet 114 ( Figure 3 ) and the other end is connected to the bottom of the second distribution groove 1113. Thus, the gas required for the reaction entering from the inlet 113 can flow into the first distribution groove 1112 through the inlet channel 1131. Similarly, the material in the second distribution groove 1113 can flow to the outlet 114 through the outlet channel 1141.

[0088] Since the other end of the inlet channel 1131 is in communication with the bottom of the first distribution groove 1112, and the other end of the outlet channel 1141 is in communication with the bottom of the second distribution groove 1113, when the liquid in the reaction process flows into the first distribution groove 1112 or the second distribution groove 1113, it can flow to the inlet 113 through the inlet channel 1131, or flow to the outlet 114 through the outlet channel 1141, thereby avoiding the accumulation of liquid in the first distribution groove 1112 and the second distribution groove 1113. Of course, in other embodiments, the other end of the inlet channel 1131 can also be in communication with the groove wall of the first distribution groove 1112, and the other end of the outlet channel 1141 can also be in communication with the groove wall of the second distribution groove 1113.

[0089] In order to enable the inlet channel 1131 and the outlet channel 1141 to communicate with the bottom of the first distribution groove 1112 and the bottom of the second distribution groove 1113 respectively, in some embodiments, as shown in FIG. Figure 7 As shown, Figure 7 The cross-sectional view of a flow field plate 11 provided in an embodiment of the present application, the inlet channel 1131 can be L-shaped. In this way, the inlet channel 1131 can be conveniently connected to the bottom of the first distribution groove 1112. Similarly, the outlet channel 1141 can also be connected to the bottom of the first distribution groove 1112. Figure 7The inlet channel 1131 shown has a similar shape so as to better communicate with the bottom of the second distribution groove 1113 .

[0090] In some embodiments, Figure 8 As shown, Figure 8 A rear view of a flow field plate 11 provided in an embodiment of the present application, wherein at least one second peripheral wall 1122 is provided with a plurality of temperature measuring holes 115, and the plurality of temperature measuring holes 115 are arranged at intervals along the first direction. Thus, by providing the temperature measuring holes 115, the temperature of the plate body can be detected so as to obtain better test data.

[0091] It is understandable that the number of the temperature measuring holes 115 can be designed according to actual conditions. For example, the number of the temperature measuring holes 115 can be 2 to 20. For example, the number of the temperature measuring holes 115 can be 15. At the same time, the aperture of the temperature measuring holes 115 can also be designed according to actual conditions. For example, the aperture of the temperature measuring holes 115 can be 1 mm to 2 mm.

[0092] For example, refer to Figure 3 When the plate body is roughly in the shape of a rectangular parallelepiped, the temperature measuring hole 115 can extend along the width direction of the plate body. The extension length can be selected according to actual conditions. For example, the temperature measuring hole 115 can extend to half of the width dimension of the plate body. Of course, the temperature measuring hole 115 can also extend to other positions of the plate body to better measure the temperature distribution at other positions of the plate body.

[0093] Exemplarily, the number of the temperature measuring holes 115 can be four, which are arranged at intervals along the extension direction of the flow channel 1111. When the flow field plate 11 is used to circulate hydrogen, the temperatures at the four temperature measuring holes 115 that can be obtained through testing are 75°C, 74°C, 72°C, and 71°C, respectively. When the flow field plate 11 is used to circulate air, the temperatures at the four temperature measuring holes 115 that can be obtained through testing are 75°C, 77°C, 77°C, and 78°C, respectively. Thus, the temperatures at different positions can be measured through different temperature measuring holes 115.

[0094] The position of the temperature measuring hole 115 can be selected according to actual conditions. In some embodiments, a plurality of temperature measuring holes 115 can be provided on one of the second peripheral walls 1122, and no temperature measuring hole 115 is provided on the other second peripheral wall 1122. Alternatively, in other embodiments, a plurality of temperature measuring holes 115 are provided on the two second peripheral walls 1122, respectively, and the plurality of temperature measuring holes 115 on the two second peripheral walls 1122 are staggered. In this way, the temperature conditions at different positions can be better measured.

[0095] In some embodiments, Figure 5 and Figure 6As shown, the first surface 111 is provided with a plurality of positioning holes 116. Thus, when installing the flow field plate 11, the position can be first positioned through the plurality of positioning holes 116 on the flow field plate 11, and then the flow field plate 11 can be installed, without the need to manually maintain the position of the flow field plate 11, and the installation is more convenient.

[0096] In addition, in order to install the flow field plate 11, as Figure 5 and Figure 6 As shown, the first surface 111 is also provided with a mounting hole 117. The flow field plate 11 can be mounted through the mounting hole 117. Exemplarily, the mounting hole 117 can be a threaded hole. In this way, by passing a bolt through the threaded hole, a threaded connection with the bolt can be achieved. At this time, the bolt can be threadedly connected to the mounting holes 117 on the two flow field plates 11 on both sides of the membrane electrode 12 by the bolt, thereby achieving the installation and fixation between the flow field plates 11 on both sides of the membrane electrode 12.

[0097] In some embodiments, Fig. 9 As shown, Fig. 9 A schematic diagram of the structure of another flow field plate 11 provided in an embodiment of the present application, wherein a sealing groove 1114 is formed on the first surface 111. The sealing groove 1114 is located at the periphery of the flow channel 1111 and is arranged around the periphery of the flow channel 1111. Accordingly, in the process of actual application, a flow channel sealing ring may be provided at the corresponding position of the membrane electrode 12. The flow channel sealing ring may be located in the sealing groove 1114. In this way, the flow channel sealing ring and the sealing groove 1114 may cooperate to play a sealing role. Among them, the width and thickness of the sealing groove 1114 may be consistent with the thickness of the flow channel sealing ring on the membrane electrode 12, so that the sealing groove 1114 may be better adapted to the flow channel sealing ring. Exemplarily, the width of the sealing groove 1114 may be 1 mm-5 mm.

[0098] In some embodiments, the number of flow channels 1111 can be greater than or equal to 3 and less than or equal to 45. Based on the above solution, the number of flow channels 1111 is small, which can reduce the size of the flow field plate 11, thereby facilitating the manufacture of the flow field plate 11. At the same time, when the number of flow channels 1111 is small, it can ensure that the gas flowing in different flow channels 1111 is evenly distributed. The shape of the flow channel 1111 can be designed according to actual conditions. For example, Fig.10 As shown, Fig.10 This is a schematic diagram of the structures of various flow channels 1111 provided in an embodiment of the present application. The flow channel 1111 may be curved or straight.

[0099] For example, the length of the plate body may be 350 mm, the width of the plate body may be 110 mm, and the thickness of the plate body may be 30 mm. The length of the region on the plate body where the flow channel 1111 is provided may be 245 mm, which may be consistent with the length of the reaction region of the bipolar plate (cathode plate and anode plate), and the width of the region on the plate body where the flow channel 1111 is provided may be 25 mm.

[0100] For example, the width of the area of ​​the flow field plate 11 where the flow channels 1111 are designed can be 5 mm to 40 mm, and further can be 15 mm to 30 mm. The number of flow channels 1111 can be between 10 and 25, and the area of ​​the reaction zone where the flow channels 1111 are provided can be 20 cm 2 -100 cm 2 For example, the number of flow channels 1111 may be 19, which may include all structural features of the reaction zone flow field of the electrode plate, so as to truly characterize the mass transfer characteristics of the reaction zone flow field of the complete electrode plate.

[0101] Among them, the length of the flow channel 1111 can be the length of the actual flow channel 1111 of the bipolar plate, for example, the length of the flow channel 1111 of the flow field plate 11 can be 150mm-280mm. The width can be the width of the flow channel 1111 of the actual bipolar plate, and the width of the flow channel 1111 of the flow field plate 11 can be 20mm-30mm, for example, 25mm. As mentioned above, since the length, width and shape of the flow channel 1111 of the flow field plate 11 provided in the embodiment of the present application can be consistent with the length, width and shape of the flow channel 1111 of the actual bipolar plate, respectively, it can truly characterize the characteristics of the flow field of the actual complete plate reaction area.

[0102] In some embodiments, Figure 5 As shown, the first surface 111 may include a first sub-surface 1115 and a second sub-surface 1116. The first sub-surface 1115 is formed with a flow channel 1111 and a sealing groove 1114. The second sub-surface 1116 is arranged around the periphery of the first sub-surface 1115 and is located on the side of the first sub-surface 1115 close to the second surface. In this way, when the flow field plate 11 cooperates with the membrane electrode 12, it can ensure that the first sub-surface 1115 is in contact with the surface of the membrane electrode 12, thereby ensuring that the membrane electrode 12 can cooperate with the flow channel 1111 and cover the flow channel 1111. The second sub-surface 1116 can cooperate with the membrane electrode 12, and the first sub-surface 1115 can compress the membrane electrode 12. The height difference between the first sub-surface 1115 and the second sub-surface 1116 can be used to know the compression amount of the membrane electrode 12, so that the compression amount can be better controlled and the matching accuracy can be improved.

[0103] The height difference between the first sub-surface 1115 and the second sub-surface 1116 can be designed according to actual conditions. For example, along the direction perpendicular to the second surface, the distance between the first sub-surface 1115 and the second sub-surface 1116 can be 0.2 mm-1 mm.

[0104] In addition, if Figure 5 As shown, a concave area 1119 may be provided at the periphery of the flow channel 1111, and the concave area 1119 is provided around the periphery of the flow channel 1111. Figure 5 As shown, the recessed area 1119 is arranged close to the flow channel 1111. Thus, the recessed area 1119 can Figure 2 ) is avoided so that the flow field plate 11 can better cooperate with the membrane electrode 12.

[0105] like Fig.11 As shown, Fig.11 This is a schematic diagram of the local structure when the flow field plate 11 and the membrane electrode 12 cooperate. The flow channel 1111 is in the shape of a groove, and a flow channel ridge 1117 is formed between the flow channels 1111. The flow channel ridge 1117 is in contact with the surface of the membrane electrode 12. At the same time, there is a compression between the flow channel ridge 1117 and the membrane electrode 12, that is, the flow channel ridge 1117 will cause a certain amount of compression on the surface of the membrane electrode 12. Among them, the flow channel ridge 1117 can be higher than the first sub-surface 1115, or it can be in the same plane as the first sub-surface 1115. Among them, continue to refer to Fig.11 The portions of the membrane electrode 12 located outside the flow channel 1111 are respectively the carbon paper region 121 and the frame region 122. The sealing groove 1114 can cooperate with the carbon paper region 121, and the first sub-surface 1115 can cooperate with the frame region 122.

[0106] In some embodiments, Fig. 9 As shown, the first surface 111 of the flow field plate 11 has a separation groove, and the separation groove is filled with insulating resin 1118. Exemplarily, the width of the separation groove can be 1mm-5mm. When making, the above-mentioned separation groove can be first opened on the flow field plate 11, and insulating material can be placed in the separation groove. At this time, the first surface 111 of the flow field plate 11 can be a complete plane. Among them, the separation groove forms a plurality of mutually independent separation areas. Exemplarily, the separation groove as a whole can be in the shape of a plurality of Chinese characters for field. The flow channel 1111 is designed in a plurality of separation areas, and when making, the flow channel 1111 is directly designed on the first surface 111 filled with the above-mentioned insulating resin. In this way, different positions of the flow channel 1111 are insulated from each other and will not conduct electricity to each other. In this way, the current density distribution at different positions of the flow channel 1111 can be detected respectively, and then the uniformity of gas distribution in the flow channel 1111 and the performance of the flow channel 1111 can be analyzed and evaluated.

[0107] In some embodiments, the flow field plate 11 can be made of graphite material. Specifically, the flow field plate 11 can be made of graphite plate material by machining.

[0108] Of course, in other embodiments, the flow field plate 11 can also be made of stainless steel, aluminum alloy or copper metal materials. Similarly, the flow field plate 11 can also be made of the above materials by machining. At the same time, the surface of the flow field plate 11 can also be coated with a coating. In this way, the flow field plate 11 can be consistent with the structure of the complete electrode plate. It is understandable that the complete real electrode plate is also coated with the above coating.

[0109] like Figure 2 As shown, the stack battery testing device 100 provided in the embodiment of the present application includes a cooling plate 70. The cooling plate 70 provided in the embodiment of the present application is further introduced below. Fig.12 As shown, Fig.12 Schematic diagram of the structure of a cooling plate 70 provided in an embodiment of the present application. A cooling channel 711 may be formed inside the cooling plate 70, and a cooling inlet 712 and a cooling outlet 713 ( Fig.13 ).

[0110] Since a cooling plate 70 is provided between the plurality of power generation unit test devices 10, during the simulation test, the coolant can enter the cooling channel 711 through the cooling inlet 712, and then flow out through the cooling outlet 713 after heat exchange. In this way, the heat generated by the adjacent power generation unit test devices 10 can be absorbed by the coolant inside the cooling plate 70, so that the heat generated by the adjacent power generation unit test devices 10 will not interfere with the test of the adjacent power generation unit test devices 10, thereby ensuring the stability of the simulation effect.

[0111] In some embodiments, the cooling plate 70 provided in the embodiments of the present application may include a cooling plate body 71 and a cover plate 72. A cooling channel 711 is formed on one side of the cooling plate body 71, and a cooling inlet 712 and a cooling outlet 713 ( Fig.13 ). Thus, the coolant can enter the cooling channel 711 through the cooling inlet 712 and flow out from the cooling outlet 713, so that the coolant can flow in the cooling channel 711. It can be understood that the cooling channel 711 is a groove structure.

[0112] The cover plate 72 is disposed on one side of the cooling channel 711 of the cooling plate body 71, connected to the cooling plate body 71, and covers the cooling channel 711. In this way, the cover plate 72 can cover the cooling channel 711, thereby allowing the coolant to flow in the cooling channel 711.

[0113] Therefore, the cooling plate 70 provided in the embodiment of the present application can be arranged between adjacent power generation unit test devices 10. Since the cover plate 72 is arranged on the side of the cooling channel 711 of the cooling plate body 71, it is connected to the cooling plate body 71 and covers the cooling channel 711. In this way, the coolant can flow from the cooling inlet 712 into the cooling channel 711 and finally flow out from the cooling outlet 713. At the same time, the coolant in the cooling channel 711 can exchange heat and absorb the heat generated by the adjacent power generation unit test devices 10, thereby avoiding the mutual influence between the heat generated by the adjacent power generation unit test devices 10 and ensuring the test effect of the power generation unit test device 10.

[0114] In one embodiment, a flow groove (not shown) is formed on one side of the cover plate 72 close to the cooling plate body 61. The flow groove is arranged opposite to the cooling channel 711 and is interconnected. Thus, by providing the flow groove on the cover plate 72, the flow rate of the coolant in the cooling plate 70 can be increased, so that the coolant can better exchange heat and ensure the heat exchange effect.

[0115] based on Figure 2 In the scheme shown, since a cooling plate 70 can be provided between adjacent power generation unit test devices 10, the temperature of the flow field plates 11 of the power generation unit test devices 10 can be made closer, so that the working environment of each flow field plate 11 remains consistent. Exemplarily, its temperature distribution is shown in Table 1 below. Among them, the four temperature measuring holes 115 are respectively arranged at intervals along the extension direction of the flow channel 1111 of the flow field plate 11. Flow field plate A1 and flow field plate B1 are flow field plates 11 located at the ends of the battery stack battery test device 100, and flow field plate B1 and flow field plate B2 are flow field plates 11 located in the middle of the battery stack battery test device 100.

[0116] Table 1

[0117]

[0118] It can be seen from Table 2 that the temperatures of the flow field plates 11 at different positions are basically consistent, and the cooling plate 70 can achieve a good heat absorption effect, so that the temperatures of the flow field plates 11 at various positions are relatively close.

[0119] As an example, the structure of the cooling plate body 71 provided in the embodiment of the present application may be similar to the structure of the plate body of the flow field plate 11 described above. Fig.12 As shown, in some embodiments, the cooling plate body 71 has a third surface 714, a fourth surface (not shown) and a cooling peripheral wall 715. The third surface 714 and the fourth surface are arranged relatively spaced apart. The third surface 714 is formed with a cooling channel 711.

[0120] like Fig.12 and Fig.13 As shown, Fig.13 A side view of a cooling plate body 71 provided in an embodiment of the present application, wherein a cooling peripheral wall 715 is located between a third surface 714 and a fourth surface, and is arranged around the periphery of the third surface 714 and the fourth surface. A cooling inlet 712 and a cooling outlet 713 are provided in the cooling peripheral wall 715. The cooling inlet 712 and the cooling outlet 713 are both connected to the cooling flow channel 711. In this way, since the cooling inlet 712 and the cooling outlet 713 are arranged on the cooling peripheral wall 715 of the cooling plate body 71, in actual application, the connecting pipeline can be directly connected to the cooling inlet 712 and the cooling outlet 713 from the peripheral side of the cooling plate body 71, and the connection is more convenient and will not be affected by other components (such as the flow field plate 11).

[0121] In some embodiments, Fig.12 As shown, the cooling peripheral wall 715 includes two first cooling peripheral walls 7151 and two second cooling peripheral walls 7152. The two first cooling peripheral walls 7151 are arranged at intervals along the first direction X. The two second cooling peripheral walls 7152 are located between the two first cooling peripheral walls 7151, and the two ends are respectively connected to the two first cooling peripheral walls 7151. The two second cooling peripheral walls 7152 are arranged at intervals along the second direction Y.

[0122] The first direction X and the second direction Y are perpendicular to each other. The two ends of the cooling channel 711 are spaced apart along the first direction X. A first cooling peripheral wall 7151 is provided with a cooling inlet 712, and another first cooling peripheral wall 7151 is provided with a cooling outlet 713. Since the two ends of the cooling channel 711 are spaced apart along the first direction X, the cooling inlet 712 can be connected to one end of the cooling channel 711, and the cooling outlet 713 can be connected to the other end of the cooling channel 711. In this way, the coolant can flow through the cooling channel 711 better, so that the coolant can exchange heat more fully, ensuring the heat exchange efficiency.

[0123] For example, Fig.12 As shown, the cooling plate body 71 as a whole can be roughly in the shape of a cuboid, and the two first cooling peripheral walls 7151 can be distributed along the length direction of the cooling plate body 71. The two second cooling peripheral walls 7152 can be distributed along the width direction of the cooling plate body 71. In this way, the cooling inlet 712 and the cooling outlet 713 are respectively located at both ends of the length direction of the cooling plate body 71, and the cooling channel 711 is also extended along the length direction of the cooling plate body 71, so that the length of the cooling channel 711 can be guaranteed.

[0124] In some embodiments, the cooling inlet 712 and the cooling outlet 713 can be staggered along the second direction Y. Based on this, during the actual application of the cooling plate body 71, the width direction of the plate body can be parallel to the vertical direction. In this way, the coolant entering from the cooling inlet 712 can smoothly flow out from the cooling outlet 713 under the action of gravity to ensure the transportation effect. It can be understood that the cooling inlet 712 is above the cooling outlet 713 in actual application to achieve the effect of using gravity to improve the transportation effect. Of course, in other embodiments, the cooling inlet 712 and the cooling outlet 713 can also be arranged relatively, and the positions of the cooling inlet 712 and the cooling outlet 713 can be designed according to actual conditions.

[0125] In some embodiments, the number of cooling channels 711 may be multiple. Fig.14 As shown, Fig.14 A top view of a cooling plate body 71 provided in an embodiment of the present application, wherein a plurality of cooling channels 711 are arranged along the second direction. A first cooling distribution groove 7141 and a second cooling distribution groove 7142 are formed on the third surface 714. A cooling inlet 712 ( Fig.12 ) is connected to the first cooling distribution groove 7141, and the cooling outlet 713 ( Fig.13 ) is connected to the second cooling distribution groove 7142. Along the first direction X, the first cooling distribution groove 7141 and the second cooling distribution groove 7142 are respectively located on both sides of the plurality of cooling channels 711. One end of the plurality of cooling channels 711 is connected to the first cooling distribution groove 7141, and the other end is connected to the second cooling distribution groove 7142.

[0126] Thus, the coolant can enter different cooling channels 711 through the first cooling distribution groove 7141, and converge into the second cooling distribution groove 7142, and flow out from the cooling outlet 713. At the same time, the first cooling distribution groove 7141 and the second cooling distribution groove 7142 are directly connected to the multiple cooling channels 711, so that the distribution can be more uniform, and the material flowing in each cooling channel 711 can be more uniform, avoiding the problem of uneven distribution when distributing separately. Of course, in other embodiments, the multiple cooling channels 711 can also be connected to the cooling inlet 712 or the cooling outlet 713 through multiple connecting grooves.

[0127] In some embodiments, along the direction perpendicular to the fourth surface, the bottom of the first cooling distribution groove 7141 and the bottom of the second cooling distribution groove 7142 can both be located on the side of the bottom of the cooling channel 711 close to the fourth surface. In this way, the coolant can flow into the first cooling distribution groove 7141 or the second cooling distribution groove 7142 better, so that the coolant flows out completely and smoothly, avoiding the temperature of the coolant in the cooling channel 711 from gradually increasing over time.

[0128] In some embodiments, Fig.14 As shown, a cooling inlet channel 716 and a cooling outlet channel 717 are formed inside the cooling plate body 71. One end of the cooling inlet channel 716 is connected to the cooling inlet 712 ( Fig.12 ) and the other end is connected to the bottom of the first cooling distribution groove 7141. One end of the cooling outlet channel 717 is connected to the cooling outlet 713 ( Fig.13 ) and the other end is connected to the bottom of the second cooling distribution groove 7142.

[0129] Thus, the coolant entering from the cooling inlet 712 can flow into the first cooling distribution groove 7141 through the cooling inlet channel 716. Similarly, the coolant in the second cooling distribution groove 7142 can flow to the cooling outlet 713 through the cooling outlet channel 717. At the same time, since the other end of the cooling inlet channel 716 is connected to the bottom of the first cooling distribution groove 7141, the other end of the cooling outlet channel 717 is connected to the bottom of the second cooling distribution groove 7142. In this way, when the coolant flows into the first cooling distribution groove 7141 or the second cooling distribution groove 7142, it can flow to the cooling inlet 712 better through the cooling inlet channel 716, or flow to the cooling outlet 713 better through the cooling outlet channel 717, thereby avoiding the accumulation of liquid in the first cooling distribution groove 7141 and the second cooling distribution groove 7142.

[0130] In some embodiments, Fig.15 As shown, Fig.15 A partial cross-sectional view of a cooling plate body 71 provided in an embodiment of the present application, wherein the cooling inlet channel 716 may include a first inlet channel 7161 and a second inlet channel 7162 that are interconnected. One end of the first inlet channel 7161 is connected to the cooling inlet 712, and the other end is connected to one end of the second inlet channel 7162. The other end of the second inlet channel 7162 extends in a direction perpendicular to the fourth surface (i.e., Fig.15 In the up and down direction shown in the figure), it is connected to the bottom of the first cooling distribution groove 7141.

[0131] In this way, the coolant can first enter the second inlet channel 7162 through the first inlet channel 7161 through the interconnected first inlet channel 7161. Since the second inlet channel 7162 extends in a direction perpendicular to the fourth surface, the coolant can enter from the bottom of the first cooling distribution groove 7141 through the second inlet channel 7162.

[0132] Similarly, the cooling outlet channel 717 may include a first outlet channel and a second outlet channel that are interconnected. One end of the first outlet channel is connected to the cooling outlet 713, and the other end is connected to one end of the second outlet channel. The other end of the second outlet channel extends in a direction perpendicular to the fourth surface and is connected to the bottom of the second cooling distribution groove 7142.

[0133] In this way, through the interconnected first outlet channel and the second outlet channel, the coolant can first enter the second outlet channel from the bottom of the second cooling groove, then enter the first outlet channel connected to the second outlet channel, and finally flow out from the cooling outlet 713 .

[0134] In some embodiments, Fig.12 As shown, the third surface 714 may be provided with a first connection hole 718, and the cover plate 72 may be provided with a second connection hole 721. The cooling plate 70 may also include a fastener (not shown in the figure). The fastener is inserted into the second connection hole 721, extends into the first connection hole 718, and is connected to the first connection hole 718. In this way, the cooling plate body 71 and the cover plate 72 may be connected to each other by the fastener. Exemplarily, the fastener may be a bolt.

[0135] In some embodiments, Fig.14 As shown, the cooling plate 70 may further include a sealing ring 73. The sealing ring 73 is disposed on the third surface 714 and connected to the cooling plate body 71. The sealing ring 73 is located at the periphery of the cooling channel 711 and is disposed around the periphery of the cooling channel 711. The cover plate 72 is disposed on the sealing ring 73 and abuts against the sealing ring 73. In this way, the sealing ring 73 can play a sealing effect, thereby ensuring that the coolant in the cooling channel 711 is not easy to flow out from the gap between the cover plate 72 and the cooling plate body 71, thereby avoiding safety hazards caused by coolant leakage.

[0136] It is understandable that the size of the cooling plate body 71 and the size of the cover plate 72 can be designed according to actual conditions. Exemplarily, the cooling plate body 71 can be roughly a rectangular device, and the size of the cooling plate body 71 can be consistent with the main body of the flow field plate 11. Among them, the thickness of the cooling plate body 71 can be 15mm-30mm. Exemplarily, the shape of the cover plate 72 can also be roughly rectangular, the length and width of the cover plate 72 can be consistent with the length and width of the cooling plate body 71, and the thickness of the cover plate 72 can be 1mm-5mm.

[0137] In some embodiments, Figure 2 As shown, the stack battery testing device 100 may also include a first pipeline 81 and a second pipeline 82. The first pipeline 81 has a plurality of first branches, and the second pipeline 82 has a plurality of second branches. A first branch is connected to a cooling inlet 712 ( Fig.12) is connected, a second branch is connected to a cooling outlet 713 ( Fig.13 In this way, by respectively connecting the plurality of first branches and the plurality of second branches to the cooling inlet 712 and the cooling outlet 713, it is possible to ensure that the flow of the coolant of different cooling plates 70 is relatively uniform, thereby ensuring the cooling effect of each cooling plate 70.

[0138] Continue to refer to Figure 2 In some embodiments, the stack battery testing device 100 may further include a third pipeline 83 and a fourth pipeline 84, wherein the third pipeline 83 has a plurality of third branches and the fourth pipeline 84 has a plurality of fourth branches. The outlet 114 ( Figure 4 ) are connected to a third branch, and the inlet 113 ( Figure 3 ) are respectively connected to a fourth branch.

[0139] At the same time, the stack battery testing device 100 may also include a fifth pipeline 85 and a sixth pipeline 86, wherein the fifth pipeline 85 has a plurality of fifth branches, and the sixth pipeline 86 has a plurality of sixth branches. The outlets 114 of the other part of the flow field plates 11 are respectively connected to a fifth branch, and the inlets 113 are respectively connected to a sixth branch. The flow directions of the two flow field plates 11 on both sides of a membrane electrode 12 are opposite.

[0140] For example, Figure 2 As shown, the first pipeline 81, the third pipeline 83 and the sixth pipeline 86 are located on one side of the multiple power generation unit test devices, and the second pipeline 82, the fourth pipeline 84 and the fifth pipeline 85 are located on the other side of the multiple power generation unit test devices. Among them, the third branch of the third pipeline 83 can be used as a branch for hydrogen discharge, and the sixth branch of the sixth pipeline 86 can be used as a branch for air intake. The fourth branch of the fourth pipeline 84 can be used as a branch for hydrogen intake, and the fifth branch of the fifth pipeline 85 can be used as a branch for air discharge.

[0141] Therefore, the inlet 113 and the outlet 114 of the flow field plate 11 can allow the medium to flow in or out independently, thereby ensuring uniform flow distribution.

[0142] In some embodiments, the stack battery testing device 100 may further include a plurality of control valves (not shown in the figure). The plurality of first branches, second branches, third branches, fourth branches, fifth branches, and sixth branches may be provided with the above-mentioned control valves. In this way, the flow of the medium passing through the first branch, the second branch, the third branch, the fourth branch, the fifth branch, and the sixth branch may be regulated by the control valves.

[0143] In the following, with respect to the flow field plate 11 provided in the embodiment of the present application, test results obtained for different types of flow field plates 11 are exemplarily described.

[0144] based on Fig.10 and Fig.16 As shown, Fig.16 is a flow deviation line graph of different flow channel 1111 shapes. Among them, the flow channel 1111 shape of comparative example ② is Fig.10 The leftmost flow channel 1111 is shown in FIG. 1 . The flow channel 1111 of the embodiment has a shape of Fig.10 The middle flow channel 1111 shown is the flow channel 1111 actually used in the embodiment of the present application. The bipolar plate is Fig.10 The flow channel 1111 on the far right is the actual flow channel 1111 of the bipolar plate. Fig.16 It can be seen that the flow deviation between the flow channel 1111 of the embodiment of the present application and the flow channel 1111 of the bipolar plate is smaller, which is more in line with the characteristics of the bipolar plate, has a wider range of flow field adaptability, can adapt to various types of flow channel 1111 combinations, and can also ensure the uniformity of gas distribution in the flow channel 1111, and can truly reflect the mass transfer characteristics of the flow field in the complete anode and cathode plate reaction area.

[0145] like Fig.11 As shown, there is a certain amount of compression between the ridge of the flow channel 1111 and the membrane electrode 12, and different compression amounts have different effects on performance. Fig.17 As shown, Fig.17 It is a line graph when the flow field plate 11 and the membrane electrode 12 have different compression amounts. When other conditions are the same, the compression amounts between the flow field plate 11 and the membrane electrode 12 are different, and the performance characteristics exhibited are also quite different. That is, the flow field plate 11 provided in the embodiment of the present application can be used to verify the influence of different compression amounts of the flow field plate 11 and the membrane electrode 12 on the performance of the power generation unit test device 10.

[0146] Next, a comparison is made between the two groups of power generation unit test devices 10 and the bipolar plate power generation devices. Among them, the flow channels 1111 of the flow field plates 11 for circulating hydrogen in the two groups of power generation unit test devices 10 have the same structure, and are the same as the flow channels 1111 of the plates for circulating hydrogen in the two groups of bipolar plate power generation devices. The flow channels 1111 of the flow field plates 11 for circulating air in the two groups of power generation unit test devices 10 have different structures, but correspond to the same structures as the flow channels 1111 of the plates for circulating air in the two groups of bipolar plate power generation devices. The results are shown in Figure 1. Fig.18 As shown, Fig.18 The output performance line graphs of two sets of bipolar plate power generation devices and two sets of power generation unit test devices 10 are shown in Figure 1, wherein Example ① (bipolar plate) and Example ② (bipolar plate) are output performance line graphs of two sets of bipolar plate power generation devices, and Example ① (flow field plate) and Example ② (flow field plate) are output performance line graphs of two sets of power generation unit test devices 10. Fig.18It can be seen that the performance change trend of the two groups of power generation unit test devices 10 is similar to the trend of the performance line graph of the two groups of bipolar plate power generation devices, which can better characterize the bipolar plate power generation device, thereby better performing performance testing and simulation on the flow channel 1111 of the plate.

[0147] At the same time, based on the above two groups of power generation unit test devices 10 and bipolar plate power generation devices, their voltage drops at the same current density are shown in Table 2 below. It can be seen that the voltage drop of the flow field plate 11 in the two groups of power generation unit test devices 10 also has the same trend as the voltage drop of the plate in the bipolar plate power generation device. The power generation unit test device 10 can better characterize the voltage drop of the bipolar plate power generation device, and the current density and pressure drop are key parameters for evaluating the mass transfer performance of the flow field, making the reliability of the simulation test of the bipolar plate development using the power generation unit test device 10 higher.

[0148] Table 2

[0149] Hydrogen pressure drop (Kpa) Air pressure drop (Kpa) Example ① (Flow field plate) 2.64 21.04 Example ① (bipolar plate) 3.35 25 Example ② (Flow field plate) 2.58 16.75 Example ② (bipolar plate) 3.75 19.75

[0150] like Fig.19 As shown, Fig.19 The simulation results and measured results of current density under the same voltage are shown in Figure 2. Figure 2 Taking the structure shown in the figure as an example, ten groups of power generation unit test devices 10 are set. Among them, the structure of the flow field plate 11 for circulating hydrogen in each group of power generation unit test devices 10 is the same, and the structure of the flow field plate 11 for circulating air is different. Fig.19 As shown, the current density of each group of power generation unit test devices 10 is measured at the same voltage and compared with the current density of the actual bipolar plate with the same structure. It can be seen that the simulation result of the current density using the power generation unit test device 10 is roughly the same as the measured result of the actual current density of the bipolar plate. It can be seen that when performing simulation, multiple groups of power generation unit test devices 10 can be used for testing at the same time, and the simulation results are also more accurate.

[0151] based on Fig. 9 As shown, it can be used Fig. 9 The flow field plate 11 shown in the figure is used to measure the current density distribution in the flow field area, and the different positions of the flow channel are insulated and separated by insulating resin, so as to analyze and evaluate the uniformity of gas distribution in the flow channel 1111 and the performance of the flow channel 1111. Fig. 20 As shown, Fig. 20 A current partition detection simulation diagram of a flow field plate 11 provided in an embodiment of the present application can show the current density distribution corresponding to different areas.

[0152] The above embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Any equivalent substitution or change made by a person skilled in the art based on the present invention is within the protection scope of the present invention.

Claims

1. A battery stack test device, characterized in that: It comprises a plurality of power generation unit test devices and a cooling plate; the plurality of power generation unit test devices are stacked in sequence; the cooling plate is arranged between two adjacent power generation unit test devices; wherein a cooling channel is formed inside the cooling plate, and a cooling inlet and a cooling outlet connected to the cooling channel are provided.

2. The battery stack test device according to claim 1, characterized in that: The cooling plate comprises: A cooling plate body, wherein the cooling channel is formed on one side of the cooling plate body, and a cooling inlet and a cooling outlet communicated with the cooling channel are provided; and, The cover plate is arranged on a side of the cooling plate body where the cooling channel is located, is connected to the cooling plate body, and covers the cooling channel.

3. The battery stack test device according to claim 2, characterized in that: The cooling plate body has a third surface, a fourth surface and a cooling peripheral wall; the third surface and the fourth surface are arranged relatively spaced apart; the cooling peripheral wall is located between the third surface and the fourth surface, and is arranged around the periphery of the third surface and the fourth surface; the cooling flow channel is formed on the third surface; the cooling peripheral wall is provided with the cooling inlet and the cooling outlet.

4. The battery stack test device according to claim 3, characterized in that: The cooling peripheral wall comprises two first cooling peripheral walls and two second cooling peripheral walls; the two first cooling peripheral walls are arranged opposite to each other at intervals along the first direction, the two second cooling peripheral walls are located between the two first cooling peripheral walls, and the two ends are respectively connected to the two first cooling peripheral walls; the two second cooling peripheral walls are arranged opposite to each other at intervals along the second direction; The first direction and the second direction are perpendicular to each other; two ends of the cooling channel are spaced apart along the first direction; one of the first cooling peripheral walls is provided with the cooling inlet, and the other of the first cooling peripheral walls is provided with the cooling outlet.

5. The battery stack test device according to claim 4, characterized in that: The cooling inlet and the cooling outlet are staggered along the second direction.

6. The battery stack test device according to claim 4, characterized in that: The number of the cooling channels is multiple; the multiple cooling channels are arranged along the second direction; the third surface is formed with a first cooling distribution groove and a second cooling distribution groove; the cooling inlet is connected to the first cooling distribution groove, and the cooling outlet is connected to the second cooling distribution groove; along the first direction, the first cooling distribution groove and the second cooling distribution groove are respectively located on both sides of the cooling channel; one end of the multiple cooling channels is connected to the first cooling distribution groove, and the other end is connected to the second cooling distribution groove.

7. The battery stack test device according to claim 6, characterized in that: Along a direction perpendicular to the fourth surface, a groove bottom of the first cooling distribution groove and a groove bottom of the second cooling distribution groove are both located on a side of the bottom of the cooling channel close to the fourth surface.

8. The battery stack test device according to claim 6, characterized in that: A cooling inlet channel and a cooling outlet channel are formed inside the cooling plate body; one end of the cooling inlet channel is connected to the cooling inlet, and the other end is connected to the bottom of the first cooling distribution groove; one end of the cooling outlet channel is connected to the cooling outlet, and the other end is connected to the bottom of the second cooling distribution groove.

9. The battery stack test device according to claim 2, characterized in that: A flow groove is formed on one side of the cover plate close to the cooling plate body; the flow groove and the cooling channel are arranged opposite to each other and are connected to each other.

10. The battery stack test device according to claim 3, characterized in that: The third surface is provided with a first connection hole; the cover plate is provided with a second connection hole; the cooling plate further comprises a fastener; the fastener is passed through the second connection hole and extends into the first connection hole to be connected with the first connection hole.

11. The battery stack test device according to claim 3, characterized in that: The cooling plate also includes a sealing ring; the sealing ring is arranged on the third surface and connected to the cooling plate body; the sealing ring is located at the periphery of the cooling channel and is arranged around the periphery of the cooling channel; the cover plate is arranged on the sealing ring and abuts against the sealing ring.

12. The stack battery testing device according to any one of claims 1 to 11, characterized in that: The stack battery testing device further includes a first pipeline and a second pipeline; the first pipeline has a plurality of first branches, and the second pipeline has a plurality of second branches; one of the first branches is connected to one of the cooling inlets, and one of the second branches is connected to one of the cooling outlets; and / or, The power generation unit test device includes a membrane electrode and flow field plates arranged on both sides of the membrane electrode; the flow field plate has an inlet and an outlet; the stack battery test device also includes a third pipeline, a fourth pipeline, a fifth pipeline and a sixth pipeline; The third pipeline has a plurality of third branches; the fourth pipeline has a plurality of fourth branches; the outlets of some of the flow field plates are respectively connected to one of the third branches, and the inlets of some of the flow field plates are respectively connected to one of the fourth branches; The fifth pipeline has a plurality of fifth branches; the sixth pipeline has a plurality of sixth branches; the outlets of another part of the flow field plates are respectively connected to one of the fifth branches, and the inlets of another part of the flow field plates are respectively connected to one of the sixth branches.

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