Novel polar plate for low-flow-resistance PEM electrolyzed water test fixture

Abstract

The utility model provides a novel polar plate for a low-flow-resistance PEM electrolyzed water test fixture. A flow field structure is arranged on the upper surface of the polar plate; the polar plate is provided with a common channel I in one end of the flow field structure, and a confluence channel I is formed in the upper surface of the tail end of a flow channel in the flow field structure; a flow channel in the flow field structure is communicated to the public channel I through the confluence channel; when the polar plate is used as an anode plate, the polar plate is provided with a public channel II in the material inlet side, and a plurality of inlet distribution through holes are formed in the upper surface of the material inlet side; each flow channel in the flow field structure is provided with the corresponding inlet distribution through hole at the starting point of the material inlet side, and the flow channels are communicated to the public channel II through the corresponding inlet distribution through holes. According to the technical scheme, the flow resistance of the electrolytic bath can be effectively reduced, and the test performance and the stability of the test fixture under high current density can be effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electrolytic water hydrogen production technical field, specifically, especially, a kind of novel low flow resistance PEM electrolytic water test fixture polar plate. BACKGROUND

[0002] The design and development of key materials related to electrolytic water hydrogen production technology and the construction of evaluation system are the key to promote the development process of electrolytic water hydrogen production technology. Electrolytic water test fixture is the core component of the evaluation test system, and the design of polar plate structure in test fixture is the key core component that affects the test performance. Polar plate has the important functions of uniform fluid distribution, electron transmission and gas dispersion. Current polar plate design related to electrolytic water hydrogen production mainly focuses on large-area polar plate flow channel design and bipolar plate structure design, and there is little polar plate structure design for small surface test fixture.

[0003] The polar plate used in current electrolytic water test fixture generally uses fuel cell polar plate structure, adopts single serpentine, three serpentine and parallel flow channel, and adopts single material inlet mode. However, the electrolysis material is water, which serves as both the reaction material and the cooling medium of the electrolytic cell, carrying away the heat generated on the membrane electrode surface due to ohmic resistance. The flow rate of material water is often much higher than the actual water consumption, and the ratio of material water inlet flow to actual consumption is about 100-200:1 (material water measurement ratio). At the same time, the rated current of PEM electrolytic cell is generally 1-1.5 A / cm 2 , and in the future, the operating current density will increase to 3-6 A / cm 2 or even 10 A / cm 2 , so the demand for test fixtures that can meet the performance testing of membrane electrode under high current density will gradually increase. Due to the small flow cross-sectional area, the single material inlet cannot meet the flow of material water and the liquid mixture formed by the gas under the condition of high current density testing, and the uneven distribution of small active area single cell test fixture will cause mass transfer problems, and the gas products cannot be discharged in time. At the same time, the high internal flow resistance of test fixture cannot operate under high material water measurement ratio, which will cause the heat generated on the membrane electrode surface to be removed in time, causing negative effects such as proton membrane degradation and catalyst agglomeration inactivation, affecting the test performance during high current density testing, and there is a risk of flow channel blockage during long-term durability testing. UTILITY MODEL CONTENTS

[0004] In view of the technical problems existing in the prior art, the utility model provides a novel low flow resistance PEM electrolytic water test fixture is with polar plate, the material entrance side and the export side of polar plate are provided with the public passage with larger flow cross section area, and the distribution through hole that communicates public passage is equipped with every flow channel starting point of anode plate, adopts the material water distribution of multi point feeding mode cooperation straight flow field structure, reduces the flow resistance of gas liquid mixture phase at the outlet through the structure cooperation public passage of the flow channel outlet of anode plate and cathode plate, can effectively reduce the electrolytic cell flow resistance, can effectively promote the test performance and stability of test fixture under the big current density.

[0005] The technical means adopted by the utility model are as follows:

[0006] A novel low flow resistance PEM electrolytic water test fixture is with polar plate, the upper surface of polar plate is provided with flow field structure, the inside of one end of flow field structure of polar plate is provided with public passage I, and the upper surface of the inner flow channel end of flow field structure is provided with the confluence channel I that communicates with public passage I, the flow channel in flow field structure is communicated to public passage I through confluence channel.

[0007] Further, the polar plate is used as an anode plate when performing PEM electrolytic water test, one end of the polar plate provided with the public passage I is a material export side, and the other end is a material entrance side, the inside of the material entrance side of the polar plate is provided with public passage II, and a plurality of inlet distribution through holes that communicate with public passage II are opened on the upper surface of the material entrance side, the starting point of each flow channel in the flow field structure at the material entrance side is respectively provided with the corresponding inlet distribution through hole, and the flow channel is communicated to public passage II through the corresponding inlet distribution through hole.

[0008] Further, the polar plate is used as a cathode plate when performing PEM electrolytic water test, and both ends of the polar plate are used as hydrogen export, the inside of the other end of the flow field structure of the polar plate is provided with public passage II, and the confluence channel II that communicates with public passage II is opened on the upper surface of the flow channel end on the side provided with public passage II, and the flow channel in the flow field structure is communicated to public passage II through confluence channel II.

[0009] Further, the diameter of the public passage I is 1-10mm.

[0010] Further, the diameter of the public passage II is 1-10mm.

[0011] Further, the public passage I includes a pipe interface I opened on the side surface of the polar plate, and an internal thread for connecting a pipe joint is arranged in the pipe interface I.

[0012] Further, the common channel II comprises a pipeline interface II arranged on the side surface of the polar plate, and an internal thread for connecting a pipeline joint is arranged in the pipeline interface II.

[0013] Further, the flow field structure is provided with a straight flow channel.

[0014] Further, the polar plate is provided with a thermocouple insertion hole on the side surface, for installing a thermocouple.

[0015] Further, the polar plate is provided with a mounting and positioning hole penetrating through the polar plate in the thickness direction at both ends, for mounting a positioning rod.

[0016] Compared with the prior art, the utility model has the following advantages:

[0017] 1. The polar plate for the novel low-flow-resistance PEM electrolytic water test fixture has the common channel, can reduce the flow resistance, effectively reduces the pressure difference of the electrolytic cell inlet and outlet, quickly removes the product, and improves the performance of the electrolytic water test fixture under large current density operation.

[0018] 2. The polar plate for the novel low-flow-resistance PEM electrolytic water test fixture has the common channel, the current collecting channel and the distribution through hole, can effectively reduce the risk caused by flow channel blockage in the long-term stability test process.

[0019] 3. The polar plate for the novel low-flow-resistance PEM electrolytic water test fixture has the common channel with a wide flow cross section arranged on the cathode plate and the anode plate, and the multiple feeding holes arranged on the anode plate, so that the electrolytic cell can use a higher material water metering ratio, effectively removes the reaction heat under large current density, prevents the proton membrane from degrading under high temperature, and improves the stability of the test.

[0020] Based on the above reasons, the utility model can be widely popularized in the field of electrolytic water hydrogen production. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be simply introduced below. Obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0022] Figure 1 The polar plate structure schematic view of the utility model is shown.

[0023] Figure 2 The polar plate front view structure schematic view of the utility model is shown.

[0024] Figure 3 The polar plate side view structure schematic diagram is described in the utility model.

[0025] Figure 4 For Figure 2 The A area local amplification diagram in the middle.

[0026] In the drawing: 1, thermocouple jack; 2, public channel I; 3, pipeline interface I; 4, convergence channel I; 5, installation positioning hole; 6, straight flow channel; 7, pipeline interface II; 8, public channel II; 9, inlet distribution through hole. DETAILED DESCRIPTION

[0027] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict. The utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0028] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, not as any limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0029] It should be noted that the terms used here are only for describing the specific embodiments, not intended to limit the exemplary embodiments according to the utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form, and in addition, it should be understood that when the terms "contain" and / or "include" are used in the specification, it means that there are features, steps, operations, devices, components and / or their combinations.

[0030] The foregoing description, for purposes of explanation, sets forth specific values and arrangements of components and steps that are subject to many options. The intent is to be accurate in describing the principles and novel features of the application. Thus, although the application has been described with reference to specific embodiments thereof, it will be apparent to those of ordinary skill in the art that a number of changes can be made to the embodiments described without departing from the spirit and scope of the application. For example, the various features of the application can be combined in any combination, where possible. Accordingly, the scope of the application is to be construed as encompassing modifications and variations of the specific examples described herein, subject only to the conditions of the prior art.

[0031] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or position relationship are usually based on the orientation or position relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, without making the opposite statement, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, therefore, it cannot be understood as a limitation on the protection scope of the present application: the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0032] For the convenience of description, spatial relative terms such as "on", "above", "upper surface", "upper" and the like can be used herein to describe the spatial position relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "on" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the example term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative description used herein is interpreted accordingly.

[0033] In addition, it should be noted that the use of "first", "second" and the like words to limit parts, only for the convenience of distinguishing the corresponding parts, if there is no further declaration, the above words have no special meaning, therefore, it cannot be understood as a limitation on the protection scope of the present application.

[0034] AsFigures 1-4 The utility model provides a novel low flow resistance PEM electrolytic water test fixture polar plate, the upper surface of polar plate is equipped with flow field structure, the inside of one end of flow field structure of polar plate is provided with public channel 2, and the upper surface of the inner flow channel end of flow field structure is equipped with the converging channel 4 that links with public channel 2, and the flow channel in flow field structure is connected to public channel 2 through converging channel 4.

[0035] Further, the polar plate is used as an anode plate when PEM electrolytic water test is carried out, one end of the polar plate provided with the public channel 2 is a material outlet side, and the other end is a material inlet side, the inside of the material inlet side of the polar plate is provided with a public channel 8, and the upper surface of the material inlet side is equipped with a plurality of inlet distribution through holes 9 connected with the public channel 8, and the starting point of each flow channel in the flow field structure at the material inlet side is respectively provided with the corresponding inlet distribution through hole 9, and the flow channel is connected to the public channel 8 through the corresponding inlet distribution through hole 9.

[0036] Further, the polar plate is used as a cathode plate when PEM electrolytic water test is carried out, and both ends of the polar plate are used as hydrogen gas outlets, the inside of the other end of the flow field structure of the polar plate is provided with a public channel 8, and the upper surface of the flow channel end on one side of the public channel 8 is equipped with a converging channel 2 connected with the public channel 8, and the flow channel in the flow field structure is connected to the public channel 8 through the converging channel 2.

[0037] Further, the diameter of the public channel 2 is 1-10mm.

[0038] Further, the diameter of the public channel 8 is 1-10mm.

[0039] Further, the public channel 2 includes a pipeline interface 3 opened on the side surface of the polar plate, and an internal thread for connecting a pipeline joint is arranged in the pipeline interface 3, and then the pipeline joint is connected to a pipeline.

[0040] Further, the public channel 8 includes a pipeline interface 7 opened on the side surface of the polar plate, and an internal thread for connecting a pipeline joint is arranged in the pipeline interface 7, and then the pipeline joint is connected to a pipeline.

[0041] Further, a straight flow channel 6 is arranged in the flow field structure.

[0042] Further, the flow field structure can also be a meandering flow field, a dot matrix flow field or a special-shaped flow field.

[0043] Further, the polar plate is provided with a thermocouple insertion hole 1 on the side surface for installing a thermocouple, which is used to detect the operating temperature of the electrolytic cell during the PEM electrolysis water test.

[0044] Further, the polar plate is provided with an installation positioning hole 5 penetrating the polar plate along the thickness direction at both ends, which is used to install a positioning rod, and when the polar plate is installed on a test fixture, the positioning rod can be connected with the test fixture to prevent misalignment.

[0045] Embodiment 1

[0046] As shown in the drawings, the polar plate for the new low-flow-resistance PEM electrolysis water test fixture provided in the embodiment is used as an anode plate during the PEM electrolysis water test; the upper surface of the polar plate is provided with a flow field structure; Figures 1-4

[0047] The polar plate is provided with a common passage I 2 inside one end of the flow field structure, and a confluence channel I 4 is provided on the upper surface of the flow field structure at the end of the flow channel, which is connected with the common passage I 2; the flow channels in the flow field structure are connected to the common passage I 2 through the confluence channel 4.

[0048] One end of the polar plate provided with the common passage I 2 is the material outlet side, and the other end is the material inlet side; the polar plate is provided with a common passage II 8 inside the material inlet side, and a plurality of inlet distribution through holes 9 are provided on the upper surface of the material inlet side, which are connected with the common passage II 8; the starting point of each flow channel in the flow field structure at the material inlet side is respectively provided with a corresponding inlet distribution through hole 9, and the flow channel is connected to the common passage II 8 through the corresponding inlet distribution through hole 9.

[0049] During the PEM electrolysis water test, the polar plate provided in the embodiment is used as an anode plate, and the material water flows from the material inlet side to the common passage II 8, and then flows into the electrolytic cell through the inlet distribution through hole 9 and the flow channel structure in the flow field, so as to realize multi-point feeding; the remaining reaction material water and oxygen flow from the material outlet side to the flow channel in the flow field structure, and then flow into the confluence channel I 4 and the common passage I 2 to discharge from the electrolytic cell.

[0050] Further, the polar plate provided in the embodiment is made of a titanium metal plate or a stainless steel metal plate with a corrosion-resistant coating as a substrate.

[0051] ​Further, the common channel I2 includes a pipeline interface I3 formed on the side surface of the polar plate, and an internal thread for connecting a pipeline joint is arranged on the inner side of the pipeline interface I3, and then the pipeline joint is connected to the water outlet pipeline; the common channel II 8 includes a pipeline interface II 7 formed on the side surface of the polar plate, and an internal thread for connecting a pipeline joint is arranged on the inner side of the pipeline interface II 7, and then the pipeline joint is connected to the water inlet pipeline.

[0052] Preferably, the polar plate provided by the embodiment is a titanium metal plate with a length of 70 mm, a width of 70 mm, and a thickness of 16 mm as a base material, and a thermocouple insertion hole 1 with a diameter of 2 mm and a depth of 6 mm is formed on the upper side surface of the polar plate.

[0053] The polar plate is internally provided with a common channel I2 with a diameter of 4 mm on the material outlet side, and a pipeline interface I3 formed on the side surface of the polar plate is provided with a G1 / 8 internal thread for connecting a pipeline joint.

[0054] The upper surface of the polar plate is provided with a flow field structure, and the flow field structure is internally provided with straight flow channels 6 with a groove width of 1 mm and a ridge width of 1 mm.

[0055] The upper surface of the polar plate on the material outlet side is provided with a width of 1 mm of the common channel I2, and the flow channel I4 is located at the end of the flow channel in the flow field structure on the material outlet side, and the flow channel in the flow field structure is connected to the common channel I2 through the flow channel I4.

[0056] When performing PEM electrolytic water test, the polar plate is used as an anode plate, and the remaining reactant water and oxygen can flow into the flow channel I4 through the straight flow channel 6 and then be discharged from the electrolytic cell through the common channel I2.

[0057] The left and right sides of the polar plate are provided with mounting positioning holes 5 with a diameter of 4.2 mm penetrating through the polar plate, which are used for mounting positioning rods, and when the polar plate is mounted on a test fixture, the positioning rods can be connected with the test fixture to prevent dislocation.

[0058] The polar plate is internally provided with a common channel II 8 with a diameter of 4 mm on the material inlet side, and a pipeline interface II 7 formed on the side surface of the polar plate is provided with a G1 / 8 internal thread for connecting a pipeline joint; each flow channel in the flow field structure is provided with a corresponding inlet distribution through hole 9 with a diameter of 1 mm at the starting point on the material inlet side.

[0059] When performing PEM electrolytic water test, the material water can flow through the common channel II 8 and then flow into the electrolytic cell through the inlet distribution through hole 9.

[0060] Embodiment 2

[0061] The novel low-flow-resistance PEM water electrolysis test fixture electrode plate provided by the embodiment is used as a cathode plate during PEM water electrolysis test; the upper surface of the electrode plate is provided with a flow field structure; the inside of one end of the flow field structure of the electrode plate is provided with a common channel I2, and the upper surface of the end of the flow channel in the flow field structure is provided with a converging channel I4 connected with the common channel I2; the flow channel in the flow field structure is connected to the common channel I2 through the converging channel I4.

[0062] Further, the electrode plate takes a graphite plate, a stainless steel plate or a titanium metal plate as a base material.

[0063] Further, the common channel I2 includes a pipeline interface I3 provided on the side surface of the electrode plate, and an internal thread for connecting a pipeline joint is arranged in the pipeline interface I3, so as to be connected to a hydrogen discharge pipeline through the pipeline joint.

[0064] When the electrode plate is used for PEM water electrolysis test, the common channel I2 serves as a hydrogen outlet of the electrode plate, and hydrogen can flow into the converging channel I4 through the flow channel in the flow field structure and then be discharged from the electrolytic cell through the common channel I2.

[0065] Embodiment 3

[0066] The novel low-flow-resistance PEM water electrolysis test fixture electrode plate provided by the embodiment further includes the following on the basis of embodiment 2:

[0067] The inside of the other end of the flow field structure of the electrode plate is provided with a common channel II8, and the upper surface of the end of the flow channel on one side of the common channel II8 is provided with a converging channel II connected with the common channel II8; the flow channel in the flow field structure is connected to the common channel II8 through the converging channel II;

[0068] Further, the common channel II8 includes a pipeline interface II7 provided on the side surface of the electrode plate, and an internal thread for connecting a pipeline joint is arranged in the pipeline interface II7, so as to be connected to a hydrogen discharge pipeline through the pipeline joint.

[0069] When the electrode plate is used for PEM water electrolysis test, the common channel I2 and the common channel II8 at both ends of the electrode plate can both serve as hydrogen outlets of the electrode plate, hydrogen can flow into the converging channel I4 and the converging channel II through the flow channel in the flow field structure at the same time, and then be discharged from the electrolytic cell through the common channel I2 and the common channel II8, thereby further improving the hydrogen discharge efficiency of the cathode plate on the basis of embodiment 2.

[0070] The cathode plate is provided with a public passage with a large flow cross section, the structure design of the public passage and the confluence channel reduces the flow resistance of the gas-liquid mixed phase at the outlet, and the inlet distribution through hole is arranged at the starting point of each flow channel of the anode plate, the straight flow field is matched to realize multi-point feeding, the electrolytic tank flow resistance can be effectively reduced, the test performance and stability of the test fixture under a large current density can be effectively improved, the test durability is increased by ensuring the constant temperature of the membrane electrode surface in the long-term stability test process, and the membrane electrode electrochemical performance can be more truly reflected.

[0071] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A novel low flow resistance PEM electrolysis water test fixture gasket characterized by, The upper surface of the polar plate is provided with a flow field structure; the polar plate is internally provided with a common passage I at one end of the flow field structure, and the upper surface of the flow channel end in the flow field structure is provided with a converging channel I in communication with the common passage I; the flow channels in the flow field structure are communicated to the common passage I through the converging channel.

2. The novel low-ohmic PEM electrolysis water test fixture gasket plate of claim 1, characterized by, The polar plate serves as an anode plate when performing a PEM electrolytic water test, one end of the polar plate provided with the common passage I is a material outlet side, and the other end is a material inlet side; the polar plate is internally provided with a common passage II at the material inlet side, and the upper surface of the material inlet side is provided with a plurality of inlet distribution through holes in communication with the common passage II; each flow channel in the flow field structure is respectively provided with a corresponding inlet distribution through hole at the starting point of the material inlet side, and the flow channel is communicated to the common passage II through the corresponding inlet distribution through hole.

3. The novel low-ohmic PEM electrolysis water test fixture gasket plate of claim 1, wherein, The polar plate serves as a cathode plate when performing a PEM electrolytic water test, both ends of the polar plate serve as hydrogen gas outlets; the polar plate is internally provided with a common passage II at the other end of the flow field structure, and the upper surface of the flow channel end on the side provided with the common passage II is provided with a converging channel II in communication with the common passage II; the flow channels in the flow field structure are communicated to the common passage II through the converging channel II.

4. The novel low-ohmic PEM electrolysis water test fixture gasket plate of claim 1, wherein, The diameter of the common passage I is 1-10 mm.

5. The novel low-ohmic PEM electrolysis water test fixture gasket plate according to claim 2 or 3, characterized in that, The diameter of the common passage II is 1-10 mm.

6. The novel low-ohmic PEM electrolysis water test fixture gasket plate of claim 1, wherein, The common passage I includes a pipeline interface I opened on the side surface of the polar plate, and an internal thread for connecting a pipeline joint is arranged along the pipeline interface I.

7. The novel low-ohmic PEM electrolysis water test fixture gasket plate according to claim 2 or 3, characterized in that, The common passage II includes a pipeline interface II opened on the side surface of the polar plate, and an internal thread for connecting a pipeline joint is arranged along the pipeline interface II.

8. The novel low-ohmic PEM electrolysis water test fixture gasket plate of claim 1, wherein, The flow field structure is provided with straight flow channels.

9. The novel low-ohmic PEM electrolysis water test fixture gasket plate of claim 1, wherein, The polar plate is provided with a thermocouple insertion hole on the side surface for installing a thermocouple.

10. The novel low flow resistance PEM electrolysis water test fixture gasket plate of claim 1, wherein, The polar plate is provided with a mounting and positioning hole penetrating the polar plate along the thickness direction at both ends for installing a positioning rod.

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