Bipolar plate and electrolysis device

Abstract

The utility model discloses a bipolar plate and an electrolysis device, and relates to the technical field of electrolysis, the bipolar plate comprises a polar plate body and a cover plate assembly; an electrolyte inlet, an anode outlet and a cathode outlet are formed in the polar plate body in a stamping manner; two opposite sides of the polar plate body are respectively stamped to form an anode side runner and a cathode side runner; the cover plate assembly is arranged on one side of the polar plate body, a first flow channel, a second flow channel and a third flow channel are arranged on one side, facing the polar plate body, of the cover plate assembly, and two ends of the first flow channel are respectively communicated with the electrolyte inlet and the anode side flow channel; two ends of the second flow channel are respectively communicated with the cathode side flow channel and the cathode outlet; and two ends of the third runner are respectively communicated with the anode side runner and the anode outlet. According to the technical scheme, the production cost can be reduced, and the production efficiency can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electrolysis, in particular to a bipolar plate and an electrolysis device using the bipolar plate. Background Art

[0002] As a clean and efficient energy source, hydrogen energy has a wide range of application prospects. At present, hydrogen is often produced by electrolyzing water. Among them, the proton exchange membrane (PEM) electrolyzer is the key equipment for hydrogen production by hydrolysis, and the electrolytic bipolar plate is one of the essential components of the PEM electrolyzer. However, the flow channels on the bipolar plates in traditional electrolysis devices are usually machined or etched, so the bipolar plates are thick, the production cost is high, and the production efficiency is low, which is not conducive to industrial mass production. Utility Model Content

[0003] The main purpose of the utility model is to provide a bipolar plate and an electrolysis device, aiming to improve the problems of high production cost and low production efficiency of the bipolar plate.

[0004] To achieve the above-mentioned purpose, the bipolar plate proposed in the utility model includes a plate body and a cover plate assembly; the plate body is stamped with an electrolyte inlet, an anode outlet and a cathode outlet; the opposite sides of the plate body are respectively stamped to form an anode side flow channel and a cathode side flow channel; the cover plate assembly is arranged on one side of the plate body, and the side of the cover plate assembly facing the plate body is provided with a first flow channel, a second flow channel and a third flow channel, and the two ends of the first flow channel are respectively connected to the electrolyte inlet and the anode side flow channel; the two ends of the second flow channel are respectively connected to the cathode side flow channel and the cathode outlet; the two ends of the third flow channel are respectively connected to the anode side flow channel and the anode outlet.

[0005] In one embodiment, the cover plate assembly is disposed on a side of the electrode body where the anode side flow channel is disposed, the electrode body is provided with a through hole, the through hole is disposed close to the cathode outlet, and the through hole connects the cathode side flow channel and the second flow channel.

[0006] In one embodiment, the cover plate assembly comprises:

[0007] A first cover plate, wherein the first flow channel is disposed on a side of the first cover plate facing the electrode body; and

[0008] A second cover plate, wherein the second cover plate and the first cover plate are arranged on the same side of the electrode body; the third flow channel is arranged on the side of the second cover plate facing the electrode body; and the second flow channel is arranged on at least one of the first cover plate and the second cover plate.

[0009] In one embodiment, a side of the cover plate assembly facing away from the plate body is a plane; the bipolar plate further comprises a first seal, which is arranged on a side of the cover plate assembly facing away from the plate body.

[0010] In one embodiment, the bipolar plate further includes a second seal, wherein the second seal surrounds the periphery of the first seal.

[0011] In one embodiment, there are at least two cathode outlets.

[0012] In one embodiment, at least two of the cathode outlets are centrally symmetrically arranged about the center of the bipolar plate;

[0013] And / or, the anode outlet and the electrolyte inlet are arranged in a centrally symmetrical manner about the center of the bipolar plate.

[0014] In one embodiment, the anode side flow channel includes an anode inlet buffer, an anode guide, and an anode outlet buffer that are connected in sequence, the first flow channel is connected to the anode inlet buffer, and the third flow channel is connected to the anode outlet buffer;

[0015] And / or, the cathode side flow channel includes a cathode guide portion and a cathode outlet buffer portion which are interconnected, and the second flow channel is connected to the cathode outlet buffer portion.

[0016] In one embodiment, the bipolar plate has a thickness dimension D, 0.3 mm ≤ D ≤ 0.5 mm.

[0017] The utility model also provides an electrolysis device, comprising the above-mentioned electrode plate.

[0018] The technical solution of the utility model is formed by stamping the electrolyte inlet, anode outlet, cathode outlet, anode side flow channel and cathode side flow channel on the opposite sides of the plate body. Compared with the processing methods of machining or etching, the stamping process has higher production efficiency and is convenient for industrial mass production. Since the thickness of the plate body is small, the production cost of the plate body is reduced. At the same time, since the thickness of the bipolar plate is thin, the pressure can be reasonably controlled in the actual production process to facilitate the anode side flow channel to be deformed appropriately, thereby increasing the contact area between the anode side flow channel and the membrane electrode, so that the bipolar plate and the membrane electrode can achieve better contact, reduce the contact internal resistance, improve energy utilization efficiency, and produce more hydrogen per unit mass of the plate. In addition, the cover plate assembly is arranged on one side of the plate body, so when the cover plate assembly is assembled with the plate body, the frequency of flipping of the plate body is reduced, thereby facilitating the improvement of the assembly efficiency of the cover plate assembly with the plate body and improving production efficiency. By providing the first flow channel, the second flow channel and the third flow channel on the side of the cover plate assembly facing the plate body, and the two ends of the first flow channel are respectively connected to the electrolyte inlet and the anode side flow channel, and the two ends of the third flow channel are respectively connected to the anode side flow channel and the anode outlet, the electrolyte inlet, the first flow channel, the anode side flow channel, the third flow channel and the anode outlet are sequentially connected, so that the electrolyte flowing in from the electrolyte inlet is electrolyzed in the anode side flow channel, and the remaining electrolyte and the generated anode gas can flow out smoothly from the anode outlet. By connecting the two ends of the second flow channel to the cathode side flow channel and the cathode outlet, respectively, the cathode gas formed on the cathode side can flow out smoothly from the cathode outlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0020] Figure 1 A schematic diagram of the exploded structure of an embodiment of a bipolar plate provided by the utility model;

[0021] Figure 2 A schematic diagram of the anode side of an embodiment of a bipolar plate provided by the utility model after assembly (wherein the cover plate assembly in the bipolar plate is in a perspective state);

[0022] Figure 3 A schematic diagram of the cathode side of an embodiment of a bipolar plate provided by the utility model after assembly (wherein the cover plate assembly in the bipolar plate is in a perspective state);

[0023] Figure 4 A schematic diagram of the back structure of an embodiment of the first cover plate in the bipolar plate provided by the utility model;

[0024] Figure 5 This is a schematic diagram of the back structure of an embodiment of the second cover plate in the bipolar plate provided by the utility model.

[0025] Description of Figure Numbers:

[0026] 100, plate body; 101, electrolyte inlet; 102, anode outlet; 103, cathode outlet; 104, through hole; 110, anode side flow channel; 111, anode inlet buffer; 112, anode guide; 113, anode outlet buffer; 120, cathode side flow channel; 121, cathode guide; 122, cathode outlet buffer;

[0027] 200, cover plate assembly; 210, first cover plate; 211, first flow channel; 220, second cover plate; 221, third flow channel; 201, second flow channel;

[0028] 300, a first sealing member;

[0029] 400, second sealing member;

[0030] 500, third sealing member;

[0031] 600. Fourth seal.

[0032] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0035] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0036] As a clean and efficient energy source, hydrogen energy has a wide range of application prospects. At present, hydrogen is often produced by electrolyzing water. Among them, the proton exchange membrane (PEM) electrolyzer is the key equipment for hydrogen production by hydrolysis, and the electrolytic bipolar plate is one of the essential components of the PEM electrolyzer. However, the flow channels on the bipolar plates in traditional electrolysis devices are usually machined or etched, so the bipolar plates are thick, the production cost is high, and the production efficiency is low, which is not conducive to industrial mass production.

[0037] In order to improve the problems of high production cost and low production efficiency of bipolar plates, the utility model proposes a bipolar plate.

[0038] In an embodiment of the present utility model, please refer to Figures 1 to 5 The bipolar plate includes a plate body 100 and a cover plate assembly 200; an electrolyte inlet 101, an anode outlet 102 and a cathode outlet 103 are stamped on the plate body 100; an anode side channel 110 and a cathode side channel 120 are stamped on opposite sides of the plate body 100; the cover plate assembly 200 is arranged on one side of the plate body 100, and a first channel 211, a second channel 201 and a third channel 221 are arranged on the side of the cover plate assembly 200 facing the plate body 100, and the two ends of the first channel 211 are respectively connected to the electrolyte inlet 101 and the anode side channel 110; the two ends of the second channel 201 are respectively connected to the cathode side channel 120 and the cathode outlet 103; the two ends of the third channel 221 are respectively connected to the anode side channel 110 and the anode outlet 102.

[0039] The electrolyte inlet 101 on the plate body 100 refers to an inlet for the electrolyte to be introduced. Generally, the plate body 100 has two opposite surfaces along its thickness direction, one of which is used as the anode side and the other as the cathode side. On the anode side, an anode side flow channel 110 is formed on the plate body 100, so that the anode gas (such as oxygen) and the electrolyzed liquid formed after the electrolyte introduced from the electrolyte inlet 101 undergoes electrolysis in the anode side flow channel 110 flow out through the anode outlet 102; on the cathode side, a cathode side flow channel 120 is formed on the plate body 100, so that the cathode gas (such as hydrogen) generated after the electrolysis in the cathode side flow channel 120 flows out through the cathode outlet 103. The bipolar plate in the technical solution of the utility model is applied to an electrolysis device. In the electrolysis device, at least two bipolar plates arranged opposite to each other can be provided. The anode side of one of the two bipolar plates is arranged opposite to the cathode side of the other of the two bipolar plates, and a proton exchange membrane can be provided between the anode side of one of the two bipolar plates and the cathode side of the other of the two bipolar plates. Therefore, when the electrolyte is passed into the anode side of one of the two bipolar plates, the anode gas and electrolyte generated by electrolysis in the anode side flow channel 110 flow to the anode outlet 102, and the generated hydrogen ions can pass through the proton exchange membrane to enter the cathode side of the other bipolar plate and form hydrogen in the cathode side flow channel 120 and then flow out from the cathode outlet 103 of the cathode side. The electrolyte inlet 101, the anode outlet 102 and the cathode outlet 103 in the bipolar plate in the technical solution of the utility model all pass through the two side surfaces of the plate body 100 in the thickness direction. The shape of the electrolyte inlet 101 can be rectangular, circular or other shapes. The shape of the anode outlet 102 can be rectangular, circular or other shapes. The cathode outlet 103 may be in a rectangular, circular or other shapes. The shapes and sizes of the electrolyte inlet 101, the anode outlet 102 and the cathode outlet 103 may be the same or different.

[0040] The cover plate assembly 200 is arranged on one side of the plate body 100, which facilitates the assembly of the cover plate assembly 200 and the plate body 100, thereby reducing the assembly steps of flipping the plate body 100. The cover plate assembly 200 is provided with a first flow channel 211, a second flow channel 201 and a third flow channel 221 on the side facing the plate body 100. It should be noted that the first flow channel 211, the second flow channel 201 and the third flow channel 221 can be provided on the same cover plate at the same time, or the three can be provided on different cover plates respectively, or the first flow channel 211 and the second flow channel 201 can be provided on one cover plate at the same time, and the third flow channel 221 can be provided on another cover plate, and the cover plate provided with the third flow channel 221 can also be provided with the second flow channel 201, etc. By connecting the two ends of the first flow channel 211 to the electrolyte inlet 101 and the anode side flow channel 110, and connecting the two ends of the third flow channel 221 to the anode side flow channel 110 and the anode outlet 102, the electrolyte inlet 101, the first flow channel 211, the anode side flow channel 110, the third flow channel 221 and the anode outlet 102 are connected in sequence, so that the electrolyte can smoothly enter the anode side flow channel 110 through the first flow channel 211 for electrolysis after entering the electrolyte inlet 101, and then smoothly discharge the anode gas and electrolyte from the anode outlet 102 through the third flow channel 221. By connecting the two ends of the second flow channel 201 to the cathode side flow channel 120 and the cathode outlet 103, the cathode side flow channel 120 can smoothly flow out of the cathode outlet 103 through the second flow channel 201. Specifically, the first flow channel 211 can be a straight flow channel or a curved flow channel; the second flow channel 201 can be a straight flow channel or a curved flow channel; the third flow channel 221 can be a straight flow channel or a curved flow channel. The anode side flow channel 110 can be a straight flow channel or a curved flow channel; the cathode side flow channel 120 can be a straight flow channel or a curved flow channel. In addition, one or more first flow channels 211 can be provided; one or more second flow channels 201 can be provided; one or more third flow channels 221 can be provided; one or more anode side flow channels 110 can be provided; one or more cathode side flow channels 120 can be provided. It can be understood that when the first flow channel 211, the second flow channel 201, the third flow channel 221, the anode side flow channel 110 and the cathode side flow channel 120 are provided with multiple channels, the electrolyte and gas are more evenly guided, reducing the risk of electrolysis dead zones.

[0041] The technical solution of the utility model is formed by stamping the electrolyte inlet 101, the anode outlet 102, the cathode outlet 103, the anode side flow channel 110 and the cathode side flow channel 120 on the opposite sides of the plate body 100. Compared with the processing methods of machining or etching, the stamping process has higher production efficiency and is convenient for industrial mass production. Since the thickness of the plate body 100 is small, the production cost of the plate body 100 is reduced. At the same time, since the thickness of the bipolar plate is relatively thin, the pressure can be reasonably controlled in the actual production process to facilitate the anode side flow channel 110 to be deformed appropriately, thereby increasing the contact area between the anode side flow channel 110 and the membrane electrode, so that the bipolar plate and the membrane electrode can achieve better contact, reduce the contact internal resistance, improve the energy utilization efficiency, and produce more hydrogen per unit mass of the plate. In addition, the cover assembly 200 is disposed on one side of the plate body 100, so when the cover assembly 200 and the plate body 100 are assembled, the frequency of flipping the plate body 100 is reduced, thereby facilitating the assembly efficiency of the cover assembly 200 and the plate body 100 and improving production efficiency. By providing the first flow channel 211, the second flow channel 201 and the third flow channel 221 on the side of the cover plate assembly 200 facing the plate body 100, and the two ends of the first flow channel 211 are respectively connected to the electrolyte inlet 101 and the anode side flow channel 110, and the two ends of the third flow channel 221 are respectively connected to the anode side flow channel 110 and the anode outlet 102, the electrolyte inlet 101, the first flow channel 211, the anode side flow channel 110, the third flow channel 221 and the anode outlet 102 are sequentially connected, so that the electrolyte flowing from the electrolyte inlet 101 is electrolyzed in the anode side flow channel 110, and the remaining electrolyte and the generated anode gas can flow out smoothly from the anode outlet 102. By connecting the two ends of the second flow channel 201 to the cathode side flow channel 120 and the cathode outlet 103, respectively, it is convenient for the cathode gas formed on the cathode side to flow out smoothly from the cathode outlet 103.

[0042] In one embodiment of the present utility model, please refer to Figure 1 , Figure 3 as well as Figure 5 The cover plate assembly 200 is disposed on one side of the electrode body 100 where the anode side flow channel 110 is disposed. The electrode body 100 is provided with a through hole 104 . The through hole 104 is disposed close to the cathode outlet 103 , and the through hole 104 connects the cathode side flow channel 120 and the second flow channel 201 .

[0043] By arranging the cover plate assembly 200 on the side of the electrode body 100 where the anode flow channel is provided, a through hole 104 close to the cathode outlet 103 is opened on the electrode body 100, and the through hole 104 connects the cathode side flow channel 120 and the second flow channel 201. Then, on the side where hydrogen is generated, it passes through the cathode side flow channel 120 into the through hole 104, then flows from the through hole 104 to the anode flow channel, and finally flows out from the cathode outlet 103 connected to the second flow channel 201.

[0044] Of course, in other embodiments, the through hole 104 may not be provided on the electrode plate body 100 , but the second flow channel 201 is connected to the cathode side flow channel 120 through a portion of the cathode outlet 103 .

[0045] In one embodiment of the present utility model, please refer to Figure 2 , Figure 4 as well as Figure 5 The cover plate assembly 200 includes a first cover plate 210 and a second cover plate 220. The first cover plate 210 is provided with a first flow channel 211 on the side facing the electrode body 100; the second cover plate 220 and the first cover plate 210 are arranged on the same side of the electrode body 100; the second cover plate 220 is provided with a third flow channel 221 on the side facing the electrode body 100; at least one of the first cover plate 210 and the second cover plate 220 is provided with a second flow channel 201.

[0046] It can be understood that the electrolyte inlet 101 and the anode outlet 102 are usually respectively arranged at the two ends of the electrode body 100. By providing the first flow channel 211 on the side of the first cover plate 210 facing the electrode body 100 and the third flow channel 221 on the side of the second cover plate 220 facing the electrode body 100, the first flow channel 211 and the third flow channel 221 are respectively provided on different cover plates, thereby facilitating the processing of the first flow channel 211 and the third flow channel 221. In addition, by providing at least one of the first cover plate 210 and the second cover plate 220 with the second flow channel 201, the first flow channel 211 and the second flow channel 201 can be formed on the same cover plate, or the third flow channel 221 and the second flow channel 201 can be formed on the same cover body, thereby reducing the number of cover plates in the cover plate assembly 200, thereby facilitating assembly and improving assembly efficiency. By arranging the first cover plate 210 and the second cover plate 220 on the same side of the plate body 100, it is easier to assemble the first cover plate 210 and the second cover plate 220 with the plate body 100, reducing the need to flip the plate body 100 during the assembly process, thereby improving production efficiency.

[0047] Of course, in other examples, the first flow channel 211 , the second flow channel 201 , and the third flow channel 221 may be respectively disposed on different cover plates.

[0048] In one embodiment of the present utility model, please refer to Figure 1 and Figure 2 The side of the cover plate assembly 200 facing away from the plate body 100 is a plane; the bipolar plate further includes a first seal 300 , which is disposed on the side of the cover plate assembly 200 facing away from the plate body 100 .

[0049] By setting the side of the cover plate assembly 200 away from the plate body 100 as a plane, it is convenient to install the seal on the side of the cover plate assembly 200 away from the plate body 100, reducing the risk of the seal blocking the first flow channel 211 and / or the second flow channel 201 and / or the third flow channel 221 on the cover plate assembly 200. By arranging the first seal 300 on the side of the cover plate assembly 200 away from the plate body 100, the first seal 300 can isolate the gases on both sides of the bipolar plate from each other, that is, reducing the risk of the generated oxygen leaking outward or to the hydrogen side.

[0050] In one embodiment of the present utility model, please refer to Figure 1 and Figure 2 The bipolar plate further includes a second seal 400 , which surrounds the periphery of the first seal 300 .

[0051] By surrounding the first sealing member 300 with the second sealing member 400 , the second sealing member 400 and the first sealing member 300 together achieve a double-layer sealing effect, further reducing the risk of oxygen leakage to the outside.

[0052] Of course, please refer to Figure 1 and Figure 3 , a third seal 500 may also be installed on one side of the bipolar plate provided with the cathode side flow channel 120, and the third seal 500 is arranged corresponding to the cathode outlet 103, thereby reducing the risk of hydrogen leaking outward or leaking to the oxygen side. Furthermore, a fourth seal 600 is also surrounded by the third seal 500. In this arrangement, the fourth seal 600 and the third seal 500 together play the role of double-layer sealing of the cathode side, further reducing the risk of hydrogen leaking outward.

[0053] In one embodiment of the present invention, Figure 2 or Figure 3 As shown, at least two cathode outlets 103 are provided.

[0054] Specifically, two, three, four or more cathode outlets 103 may be provided. At least two cathode outlets 103 may be provided at the same end of the electrode plate body 100, or may be provided at two ends of the electrode plate body 100. By providing at least two cathode outlets 103, the efficiency of hydrogen production is improved.

[0055] In one embodiment of the present invention, Figure 2 or Figure 3As shown, at least two cathode outlets 103 are centrally symmetrically arranged about the center of the bipolar plate.

[0056] By arranging at least two cathode outlets 103 symmetrically about the center of the bipolar plate, the generated hydrogen can be discharged simultaneously toward at least two cathode outlets 103 of the bipolar plate, thereby improving the hydrogen production efficiency. In addition, such an arrangement is also convenient for processing and manufacturing, and improves the production efficiency of the bipolar plate.

[0057] In one embodiment of the present invention, Figure 2 or Figure 3 As shown, the anode outlet 102 and the electrolyte inlet 101 are centrally symmetrically arranged about the center of the bipolar plate.

[0058] By arranging the anode outlet 102 and the electrolyte inlet 101 in a centrally symmetrical manner about the center of the bipolar plate, the electrolyte flowing in from the electrolyte inlet 101 can have sufficient time to undergo a sufficient electrolysis reaction before being discharged to the anode outlet 102, thereby facilitating the improvement of the utilization rate of the electrolyte, so that more oxygen is discharged to the anode outlet 102 and more hydrogen is discharged to the cathode outlet 103, thereby improving the hydrogen production efficiency.

[0059] In one embodiment of the present invention, Figure 2 As shown, the anode side flow channel 110 includes an anode inlet buffer portion 111 , an anode guide portion 112 and an anode outlet buffer portion 113 which are connected in sequence. The first flow channel 211 is connected to the anode inlet buffer portion 111 , and the third flow channel 221 is connected to the anode outlet buffer portion 113 .

[0060] The anode inlet buffer 111 is used to buffer the flow rate of the electrolyte flowing in from the electrolyte inlet 101, reducing the risk of the electrolyte directly passing through the electrolysis area and being quickly discharged, so that the electrolyte can be fully electrolyzed. The anode guide 112 is used to guide the electrolyte and the oxygen formed after electrolysis, so that the electrolyte and the formed oxygen can flow toward the anode outlet 102. The anode outlet buffer 113 is used to buffer the oxygen and electrolyte formed after electrolysis, so that the discharged oxygen and electrolyte are more stable.

[0061] Specifically, the anode inlet buffer 111 and the anode outlet buffer 113 may be convex point structures convexly provided on the electrode body 100, the convex point structures are formed by stamping, and the convex point structures may be provided with multiple rows and / or multiple columns. The anode guide 112 is a relatively long flow channel, and the anode guide 112 may be a linear flow channel or a curved flow channel.

[0062] In one embodiment of the present invention, Figure 3As shown, the cathode side flow channel 120 includes a cathode guide portion 121 and a cathode outlet buffer portion 122 which are connected to each other, and the second flow channel 201 is connected to the cathode outlet buffer portion 122 .

[0063] The cathode guide 121 is used to guide the electrolyte and the hydrogen formed after electrolysis so that the electrolyte and the formed hydrogen can flow toward the cathode outlet 103. The cathode outlet buffer 122 is used to buffer the hydrogen formed after electrolysis, so that the discharged hydrogen is more stable.

[0064] Specifically, the cathode inlet buffer portion can be a convex point structure convexly provided on the electrode body 100, the convex point structure is formed by stamping, and the convex point structure can be provided with multiple rows and / or multiple columns. The cathode guide portion 121 is a long flow channel, and the anode guide portion 112 can be a straight flow channel or a curved flow channel.

[0065] In one embodiment of the present invention, the thickness dimension of the bipolar plate is D, 0.3 mm ≤ D ≤ 0.5 mm.

[0066] Specifically, the thickness dimension D of the bipolar plate can be 0.3 mm, 0.4 mm or 0.5 mm. By setting the thickness dimension D of the bipolar plate to be not less than 0.3 mm, it is ensured that the bipolar plate has sufficient strength during the stamping process. By setting the thickness dimension D of the bipolar plate to be not more than 0.5 mm, it is convenient for the bipolar plate to be stamped through the stamping die, thereby improving production efficiency; such a setting can also make the bipolar plate thinner, thereby reducing the quality and cost of the bipolar plate.

[0067] The utility model also proposes an electrolysis device, which includes a bipolar plate. The specific structure of the bipolar plate refers to the above embodiment. Since the electrolysis device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0068] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A bipolar plate, characterized in that: include: A plate body, wherein an electrolyte inlet, an anode outlet, and a cathode outlet are punched out on the plate body; an anode side flow channel and a cathode side flow channel are punched out on opposite sides of the plate body; and A cover plate assembly, wherein the cover plate assembly is arranged on one side of the electrode body, and the cover plate assembly is provided with a first flow channel, a second flow channel and a third flow channel on the side facing the electrode body, and the two ends of the first flow channel are respectively connected to the electrolyte inlet and the anode side flow channel; the two ends of the second flow channel are respectively connected to the cathode side flow channel and the cathode outlet; the two ends of the third flow channel are respectively connected to the anode side flow channel and the anode outlet.

2. The bipolar plate according to claim 1, characterized in that: The cover plate assembly is arranged on a side of the electrode plate body where the anode side flow channel is arranged. The electrode plate body is provided with a through hole, the through hole is arranged close to the cathode outlet, and the through hole connects the cathode side flow channel and the second flow channel.

3. The bipolar plate according to claim 1, characterized in that: The cover plate assembly comprises: A first cover plate, wherein the first flow channel is disposed on a side of the first cover plate facing the electrode body; and A second cover plate, wherein the second cover plate and the first cover plate are arranged on the same side of the electrode body; the third flow channel is arranged on the side of the second cover plate facing the electrode body; and the second flow channel is arranged on at least one of the first cover plate and the second cover plate.

4. The bipolar plate according to claim 1, characterized in that: The side of the cover plate assembly facing away from the plate body is a plane; the bipolar plate further comprises a first seal, which is arranged on the side of the cover plate assembly facing away from the plate body.

5. The bipolar plate according to claim 4, characterized in that: The bipolar plate further includes a second seal surrounding the periphery of the first seal.

6. The bipolar plate according to claim 1, characterized in that: There are at least two cathode outlets.

7. The bipolar plate according to claim 6, characterized in that: At least two of the cathode outlets are centrally symmetrically arranged about the center of the bipolar plate; And / or, the anode outlet and the electrolyte inlet are arranged in a centrally symmetrical manner about the center of the bipolar plate.

8. The bipolar plate according to claim 1, characterized in that: The anode side flow channel comprises an anode inlet buffer, an anode guide and an anode outlet buffer which are connected in sequence, the first flow channel is connected to the anode inlet buffer, and the third flow channel is connected to the anode outlet buffer; And / or, the cathode side flow channel includes a cathode guide portion and a cathode outlet buffer portion which are interconnected, and the second flow channel is connected to the cathode outlet buffer portion.

9. The bipolar plate according to any one of claims 1 to 8, characterized in that: The bipolar plate has a thickness dimension D, 0.3 mm ≤ D ≤ 0.5 mm.

10. An electrolysis device, characterized in that: Comprising the bipolar plate according to any one of claims 1 to 9.

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