Polar plate and alkaline water electrolysis hydrogen production electrolytic bath

Abstract

The utility model discloses a polar plate which comprises a plate body, the plate body is provided with an electrolyte distribution channel, and the electrolyte distribution channel is used for conveying electrolyte only to one side of the plate body; the electrolyte distribution channel comprises an electrolyte inlet, an electrolyte distribution groove and an electrolyte distribution hole which are communicated in sequence; the electrolyte distribution groove is positioned in the plate body; and the electrolyte inlet and the electrolyte distribution holes are formed in the surface of the plate body. According to the polar plate, the plate body is provided with the electrolyte distribution channel, the electrolyte can be conveyed into the small electrolysis chamber from the surface of the plate body, the flowing condition of the electrolyte in the small electrolysis chamber is changed, the concentration of the electrolyte in the small electrolysis chamber is uniform, mass transfer is more stable, efficiency is higher, and therefore the overpotential of an anode / cathode reaction is reduced, and the voltage of the small electrolysis chamber is reduced; the direct-current energy consumption of the electrolytic bath is reduced. The utility model further discloses an alkaline water electrolysis hydrogen production electrolytic bath applying the polar plate.

Description

Technical Field

[0001] The utility model relates to the technical field of electrolytic cell hydrogen production, and more specifically, to a polar plate, and also to an alkaline water electrolytic cell for hydrogen production using the polar plate. Background Art

[0002] See also Figure 1-2 The existing alkaline water electrolysis hydrogen production electrolyzer includes a plate, and an alkali solution inlet is provided at the bottom of the plate and an alkali solution outlet is provided at the top. During operation, the alkaline electrolyte enters the electrolysis chamber between adjacent plates through the comb-shaped grooves from the alkali solution inlet at the bottom of the plate, and then is discharged from the alkali solution outlet at the top of the plate.

[0003] However, as the electrolyte flows from the alkali solution inlet to the alkali solution outlet, water is gradually electrolyzed and the electrolyte concentration gradually increases, resulting in uneven electrolyte concentration in the electrolytic chamber, affecting the mass transfer stability and efficiency of the electrolytic cell, increasing the overpotential of the anode / cathode reaction, resulting in an increase in the electrolytic chamber voltage and high DC energy consumption of the entire electrolytic cell.

[0004] Therefore, how to reduce the DC energy consumption of the alkaline water electrolysis hydrogen production electrolyzer is a problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0005] In view of this, the utility model provides a plate, the plate body of which is provided with an electrolyte distribution channel, which can transport electrolyte from the surface of the plate body to the electrolysis chamber. Compared with the method of transporting electrolyte from the bottom to the electrolysis chamber in the prior art, the electrolyte input and flow conditions in the electrolysis chamber are changed, which is conducive to uniform electrolyte concentration in the electrolysis chamber, making mass transfer more stable and efficient, thereby reducing the overpotential of the anode / cathode reaction, reducing the voltage of the electrolysis chamber, and reducing the DC energy consumption of the electrolysis cell. The utility model also provides an alkaline water electrolysis hydrogen production electrolytic cell using the above-mentioned plate, the electrolyte concentration in the electrolysis chamber is more uniform, the voltage of the electrolysis chamber is low, and the DC energy consumption is reduced.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] An electrode plate comprises a plate body, wherein the plate body is provided with an electrolyte distribution channel, wherein the electrolyte distribution channel is used to transport electrolyte only to one side of the plate body;

[0008] The electrolyte distribution channel comprises an electrolyte inlet, an electrolyte distribution groove and an electrolyte distribution hole which are connected in sequence; the electrolyte distribution groove is located inside the plate body; the electrolyte inlet and the electrolyte distribution hole are both opened on the surface of the plate body.

[0009] Optionally, in the above-mentioned electrode plate, in the electrolyte distribution channel, there are multiple electrolyte distribution grooves; the electrolyte distribution grooves are connected to one or more electrolyte distribution holes; all the electrolyte distribution holes of the electrolyte distribution channel are opened on the same side surface of the plate body.

[0010] Optionally, in the above-mentioned electrode plate, in the electrolyte distribution channel, the electrolyte distribution grooves are parallel to each other.

[0011] Optionally, in the above-mentioned electrode plate, in the electrolyte distribution channel, there is one electrolyte distribution groove; the electrolyte distribution groove is connected to one or more electrolyte distribution holes; when there are multiple electrolyte distribution holes in the electrolyte distribution channel, all of the electrolyte distribution holes are opened on the same side surface of the plate body.

[0012] Optionally, in the above-mentioned electrode plate, the electrolyte distribution channel further includes an electrolyte distribution cavity, and the electrolyte inlet is connected to the electrolyte distribution groove through the electrolyte distribution cavity.

[0013] Optionally, in the above-mentioned electrode plate, in the electrolyte distribution channel, the electrolyte distribution cavity is located at one end edge of the plate body, and the electrolyte distribution groove extends from the electrolyte distribution cavity to the other end edge of the plate body.

[0014] Optionally, in the above-mentioned electrode plate, the electrolyte distribution hole is only provided on one side of the surface of the plate body, and the number of the electrolyte distribution channels is one or more.

[0015] Optionally, in the above-mentioned electrode plate, the electrolyte distribution holes are respectively opened on both side surfaces of the plate body; there are multiple electrolyte distribution channels, and the electrolyte distribution holes of a part of the electrolyte distribution channels are opened on one side surface of the plate body, and the electrolyte distribution holes of another part of the electrolyte distribution channels are opened on the other side surface of the plate body; different electrolyte distribution channels are not connected.

[0016] Optionally, in the above-mentioned electrode plate, the plate body includes two split bodies arranged in a stacked manner, and the two split bodies are adhered to each other and fixedly connected; the electrolyte distribution groove includes a first groove portion opened on the surface of the first split body and a second groove portion opened on the surface of the second split body; the openings of the first groove portion and the second groove portion are butted against each other and surround the electrolyte distribution groove.

[0017] Optionally, in the above-mentioned electrode plate, an electrolysis chamber outlet is provided at the edge of the plate body.

[0018] An alkaline water electrolysis hydrogen production electrolyzer comprises a pole plate, wherein the pole plate is the pole plate described in any one of the above technical solutions.

[0019] The utility model provides an electrode plate, comprising a plate body, wherein the plate body is provided with an electrolyte distribution channel, wherein the electrolyte distribution channel is used to transport electrolyte to only one side of the plate body; the electrolyte distribution channel comprises an electrolyte inlet, an electrolyte distribution groove and an electrolyte distribution hole which are connected in sequence; the electrolyte distribution groove is located inside the plate body; and the electrolyte inlet and the electrolyte distribution hole are both opened on the surface of the plate body.

[0020] After the above-mentioned electrode plate is applied, the electrolyte can be transported to the electrolytic chambers adjacent to the electrode plate only through the electrolyte distribution channel.

[0021] In the above-mentioned electrode plate, the plate body is provided with an electrolyte distribution channel, which can transport electrolyte to the electrolytic chamber through the electrolyte distribution holes opened on the surface of the plate body. By designing the opening position of the electrolyte distribution holes on the surface of the plate body, the electrolyte input and flow conditions in the electrolytic chamber can be different from those in the prior art, which is conducive to uniformizing the electrolyte concentration in the electrolytic chamber, making the mass transfer more stable and efficient, thereby reducing the overpotential of the anode / cathode reaction, reducing the voltage of the electrolytic chamber, and reducing the DC energy consumption of the electrolytic cell.

[0022] The utility model also provides an alkaline water electrolysis hydrogen production electrolytic cell using the above-mentioned electrode plate, wherein the electrolyte concentration in the electrolysis chamber is more uniform, the voltage in the electrolysis chamber is low, and the DC energy consumption is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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 these drawings without paying creative work.

[0024] Figure 1 It is a schematic diagram of the structure of the electrode plate in the prior art;

[0025] Figure 2 for Figure 1 a back view of the plate shown;

[0026] Figure 3 A schematic diagram of the main structure of the electrode plate provided in an embodiment of the utility model;

[0027] Figure 4 A cross-sectional view of a plate provided in an embodiment of the utility model;

[0028] Figure 5 for Figure 4 A magnified view of part A;

[0029] in, Figure 3-Figure 5 middle:

[0030] Plate body 10 ; electrolyte distribution channel 100 ; electrolyte distribution cavity 101 ; electrolyte distribution groove 102 ; electrolyte inlet 103 ; electrolyte distribution hole 104 ; electrolytic chamber outlet 105 ; first sub-body 11 ; second sub-body 12 . DETAILED DESCRIPTION

[0031] The utility model embodiment discloses a plate, the plate body of which is provided with an electrolyte distribution channel, which can transport electrolyte from the surface of the plate body to the electrolysis chamber. Compared with the method of transporting electrolyte from the bottom to the electrolysis chamber in the prior art, the electrolyte input and flow conditions in the electrolysis chamber are changed, which is conducive to uniform electrolyte concentration in the electrolysis chamber, making mass transfer more stable and efficient, thereby reducing the overpotential of the anode / cathode reaction, reducing the voltage of the electrolysis chamber, and reducing the DC energy consumption of the electrolysis cell. The utility model embodiment also discloses an alkaline water electrolysis hydrogen production electrolytic cell using the above-mentioned plate, wherein the electrolyte concentration in the electrolysis chamber is more uniform, the voltage of the electrolysis chamber is low, and the DC energy consumption is reduced.

[0032] 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 in 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.

[0033] See also Figure 3-Figure 5 The embodiment of the utility model provides an electrode plate, including a plate body 10, the plate body 10 is provided with an electrolyte distribution channel 100, the electrolyte distribution channel 100 is used to transport electrolyte only to one side of the plate body 10; the electrolyte distribution channel 100 includes an electrolyte inlet 103, an electrolyte distribution groove 102 and an electrolyte distribution hole 104 which are connected in sequence; the electrolyte distribution groove 102 is located inside the plate body 10; the electrolyte inlet 103 is opened on the surface of the plate body 10, and the electrolyte inlet 103 is used to connect the electrolyte externally; the electrolyte distribution hole 104 is opened on the surface of the plate body 10, and the electrolyte distribution hole 104 is used to output the electrolyte to the electrolysis chamber on one side of the electrode plate.

[0034] In the above-mentioned electrode plate, the plate body 10 is provided with an electrolyte distribution channel 100, which can transport electrolyte to the electrolytic chamber through the electrolyte distribution hole 104 opened on the surface of the plate body 10. By designing the opening position of the electrolyte distribution hole 104 on the surface of the plate body 10, the electrolyte input and flow conditions in the electrolytic chamber can be different from those in the prior art, which is conducive to uniformizing the electrolyte concentration in the electrolytic chamber, making the mass transfer more stable and efficient, thereby reducing the overpotential of the anode / cathode reaction, reducing the voltage of the electrolytic chamber, and reducing the DC energy consumption of the electrolytic cell.

[0035] In one embodiment, the plate body 10 of the electrode plate has only one side surface provided with electrolyte distribution holes 104. In this case, the plate body 10 may be provided with one electrolyte distribution channel 100, and accordingly, the electrolyte distribution channel 100 may be provided with only one electrolyte distribution hole 104, or the electrolyte distribution channel 100 may include multiple electrolyte distribution holes 104, and all electrolyte distribution holes 104 may be provided on the same side surface of the plate body 10; the plate body 10 may also be provided with multiple electrolyte distribution channels 100, and accordingly, the electrolyte distribution channel 100 may be provided with one or more electrolyte distribution holes 104. The electrode plate provided in this embodiment has only one side surface provided with electrolyte distribution holes 104, and may be used as a positive electrode plate or a negative electrode plate of an electrolytic cell.

[0036] In another embodiment, electrolyte distribution holes 104 are respectively provided on both side surfaces of the plate body 10 in the electrode plate. In this case, the plate body 10 must have multiple electrolyte distribution channels 100, and the electrolyte distribution holes 104 of a part of the electrolyte distribution channels 100 are provided on one side surface of the plate body 10, which can transport electrolyte to the electrolysis chamber on one side of the electrode plate; the electrolyte distribution holes 104 of another part of the electrolyte distribution channels 100 are provided on the other side surface of the plate body 10, which can transport electrolyte to the electrolysis chamber on the other side of the electrode plate. In this embodiment, different electrolyte distribution channels 100 are not connected, so as to avoid the electrolysis chambers on both sides of the electrode plate from being connected to each other through the electrolyte distribution channels 100, and to prevent the hydrogen and oxygen generated by the electrolysis chambers on both sides of the electrode plate from mixing through the electrolyte distribution channels 100. The electrode provided in this embodiment can be used as a bipolar plate.

[0037] After the electrode plate provided by the present application is applied, the electrolyte can be transported to the electrolytic chambers adjacent to the electrode plate only through the electrolyte distribution channel 100 .

[0038] In the above-mentioned electrode plate, if an electrolyte distribution hole 104 is provided on one side surface of the plate body 10, the electrolyte distribution hole 104 can be arranged to be located near the middle of the side surface of the plate body 10, so as to shorten the distance between the electrolyte distribution hole 104 and the structure for outputting electrolyte at the edge of the plate body 10 (specifically, the electrolytic chamber outlet 105), thereby alleviating the electrolyte concentration difference in the electrolytic chamber. At the same time, after the electrolyte distribution hole 104 is arranged in this way, part of the electrolyte enters the electrolytic chamber through the electrolyte distribution hole 104 and first flows in a direction away from the above-mentioned electrolyte output structure, and then flows toward the above-mentioned electrolyte output structure, which also helps to alleviate the electrolyte concentration difference in the electrolytic chamber.

[0039] In the above-mentioned electrode plate, if a plurality of electrolyte distribution holes 104 are provided on one side surface of the plate body 10, the electrolyte distribution holes 104 can be arranged to be uniformly distributed or non-uniformly distributed on the side surface; each electrolyte distribution hole 104 on the side surface of the plate body 10 can transport electrolyte to the same electrolysis chamber, so that the electrolyte reaches multiple positions of the electrolysis chamber, which not only has the effect of uniform electrolyte concentration, but also can reduce or even avoid the flow dead zone in the electrolysis chamber, further uniformize the electrolyte concentration at different positions of the electrolysis chamber, and also uniformize the temperature at different positions of the electrolysis chamber, so that heat can be exchanged in time, making mass transfer more stable and efficient, thereby reducing the overpotential of the anode / cathode reaction, reducing the voltage of the electrolysis chamber, and reducing the DC energy consumption of the entire alkaline water electrolysis hydrogen production electrolyzer.

[0040] In the above-mentioned electrolyte distribution channel 100, the electrolyte distribution groove 102 can be provided as one or more. When there are multiple electrolyte distribution grooves 102 in the electrolyte distribution channel 100, the electrolyte distribution groove 102 can be provided to be connected with one or more electrolyte distribution holes 104; all electrolyte distribution holes 102 of the electrolyte distribution channel 100 are opened on the same side surface of the plate body 10, so that the electrolyte distribution channel 100 is used to transport electrolyte only to one side of the plate body 10. When there are multiple electrolyte distribution grooves 102 in the electrolyte distribution channel 100, each electrolyte distribution groove 102 can be provided to be parallel to each other.

[0041] The electrolyte distribution groove 102 in the electrolyte distribution channel 100 may also be set to one; the electrolyte distribution groove 102 is connected to one or more electrolyte distribution holes 104; when there are multiple electrolyte distribution holes 104 in the electrolyte distribution channel 100, all the electrolyte distribution holes 104 are opened on the same side surface of the plate body 10. When there is one electrolyte distribution groove 102, and the electrolyte distribution groove 102 is connected to multiple electrolyte distribution holes 104, the electrolyte distribution groove 102 can be set to a spiral shape or a straight line shape, etc. This embodiment does not limit the shape of the electrolyte distribution groove 102, and it is only necessary to ensure that the electrolyte distribution groove 102 is connected to all the electrolyte distribution holes 104 opened on the surface of the plate body 10.

[0042] In order to facilitate manufacturing, the electrolyte distribution grooves 102 are preferably arranged in a straight line, and each electrolyte distribution groove 102 is arranged to be parallel to each other. Further, when there are multiple electrolyte distribution channels 100, each electrolyte distribution groove 102 of all electrolyte distribution channels 100 can also be arranged to be parallel, such as Figure 3 shown.

[0043] When the electrolyte distribution groove 102 is connected to a plurality of electrolyte distribution holes 104 , all the electrolyte distribution holes 104 connected to the electrolyte distribution groove 102 may be arranged to be evenly distributed along the extension direction of the electrolyte distribution groove 102 .

[0044] The electrolyte distribution channel 100 may further include an electrolyte distribution chamber 101, and the electrolyte inlet 103 is connected to the electrolyte distribution groove 102 through the electrolyte distribution chamber 101. In one embodiment, the electrolyte distribution chamber 101 of the electrolyte distribution channel 100 is located at one end edge of the plate body 10, and the electrolyte distribution groove 102 of the electrolyte distribution channel 100 extends from the electrolyte distribution chamber 101 to the other end edge of the plate body 10.

[0045] The plate body 10 can be set as an integrated structure, but in order to facilitate the processing of the electrolyte distribution channel 100, the plate body 10 can be set to include multiple split bodies that are arranged one by one and fixedly connected; in the electrolyte distribution channel 100, the electrolyte distribution cavity 101 is surrounded by multiple adjacent split bodies, and the electrolyte distribution groove 102 is surrounded by multiple adjacent split bodies.

[0046] In one embodiment, the plate body 10 includes two stacked parts, which are attached to each other and fixedly connected; see Figure 5 The electrolyte distribution groove 102 includes a first groove portion opened on the surface of the first split body 11 and a second groove portion opened on the surface of the second split body 12 . The openings of the first groove portion and the second groove portion are connected to form the electrolyte distribution groove 102 .

[0047] Adjacent sub-bodies in the plate body 10 may be arranged to be fixedly connected by molecular diffusion welding; the electrolyte distribution holes 104 in the electrolyte distribution channel 100 may be arranged to be round holes, square holes, triangular holes, etc., which are not limited in this embodiment.

[0048] The plate body 10 has an electrolysis chamber outlet 105 at its edge. In some embodiments, the plate body 10 has only one side edge (specifically, it can be set to the upper side edge) provided with the electrolysis chamber outlet 105. In this case, the plate body 10 has only one side surface provided with an electrolyte distribution hole 104, and the electrolyte distribution hole 104 and the electrolysis chamber outlet 105 are located on the same side of the plate body 10. In this case, the plate is used as a positive plate or a negative plate. In other embodiments, the plate body 10 has electrolysis chamber outlets 105 on both sides, the electrolysis chamber outlet 105 on one side is used to output the electrolyte and oxygen of one electrolysis chamber, and the electrolysis chamber outlet 105 on the other side is used to output the electrolyte and hydrogen of another electrolysis chamber; in this case, the plate body 10 has electrolyte distribution holes 104 on both sides, and the plate is used as a bipolar plate.

[0049] The embodiment of the utility model also provides an alkaline water electrolysis hydrogen production electrolyzer, comprising a plate, the plate being the plate provided in the above embodiment. The electrolyte used in the alkaline water electrolysis hydrogen production electrolyzer is an alkaline electrolyte.

[0050] In the above-mentioned alkaline water electrolysis hydrogen production electrolyzer, there are multiple pole plates, including a stacked positive plate, a bipolar plate and a negative plate, wherein the positive plate and the negative plate are respectively located on both sides of the bipolar plate; the positive plate and the negative plate respectively adopt the pole plate provided in the above-mentioned embodiment, in which only one side of the plate body 10 is provided with electrolyte distribution holes 104; the bipolar plate adopts the pole plate provided in the above-mentioned embodiment, in which both sides of the plate body 10 are provided with electrolyte distribution holes 104.

[0051] The alkaline water electrolysis hydrogen production electrolyzer provided in this embodiment uses the electrode plate provided in the above embodiment, and the electrolyte concentration and temperature in the electrolysis chamber are more uniform, the voltage of the electrolysis chamber is low, and the DC energy consumption is reduced. Of course, the alkaline water electrolysis hydrogen production electrolyzer provided in this embodiment also has other effects related to the electrode plate provided in the above embodiment, which will not be repeated here.

[0052] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0053] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A plate, characterized in that: It comprises a plate body, the plate body is provided with an electrolyte distribution channel, the electrolyte distribution channel is used to transport electrolyte only to one side of the plate body; The electrolyte distribution channel comprises an electrolyte inlet, an electrolyte distribution groove and an electrolyte distribution hole which are connected in sequence; the electrolyte distribution groove is located inside the plate body; the electrolyte inlet and the electrolyte distribution hole are both opened on the surface of the plate body.

2. The electrode plate according to claim 1, characterized in that: In the electrolyte distribution channel, there are multiple electrolyte distribution grooves; the electrolyte distribution grooves are connected to one or more electrolyte distribution holes; all the electrolyte distribution holes of the electrolyte distribution channel are opened on the same side surface of the plate body.

3. The electrode plate according to claim 2, characterized in that: In the electrolyte distribution channel, the electrolyte distribution grooves are parallel to each other.

4. The electrode plate according to claim 1, characterized in that: In the electrolyte distribution channel, there is one electrolyte distribution groove; the electrolyte distribution groove is connected to one or more electrolyte distribution holes; When there are a plurality of electrolyte distribution holes in the electrolyte distribution channel, all of the electrolyte distribution holes are opened on the same side surface of the plate body.

5. The electrode plate according to claim 1, characterized in that: The electrolyte distribution channel also includes an electrolyte distribution cavity, and the electrolyte inlet is connected to the electrolyte distribution groove through the electrolyte distribution cavity.

6. The electrode plate according to claim 5, characterized in that: In the electrolyte distribution channel, the electrolyte distribution cavity is located at one end edge of the plate body, and the electrolyte distribution groove extends from the electrolyte distribution cavity to the other end edge of the plate body.

7. The electrode plate according to claim 1, characterized in that: The electrolyte distribution hole is only provided on one side of the plate body, and the number of the electrolyte distribution channels is one or more.

8. The electrode plate according to claim 1, characterized in that: The electrolyte distribution holes are respectively opened on both side surfaces of the plate body; there are multiple electrolyte distribution channels, the electrolyte distribution holes of some of the electrolyte distribution channels are opened on one side surface of the plate body, and the electrolyte distribution holes of another part of the electrolyte distribution channels are opened on the other side surface of the plate body; different electrolyte distribution channels are not connected.

9. The electrode plate according to claim 1, characterized in that: The plate body includes two stacked parts, which are attached to each other and fixedly connected; the electrolyte distribution groove includes a first groove portion opened on the surface of the first part and a second groove portion opened on the surface of the second part; the openings of the first groove portion and the second groove portion are butted against each other to form the electrolyte distribution groove.

10. The electrode plate according to claim 1, characterized in that: The edge of the plate body is provided with an electrolysis chamber outlet.

11. An alkaline water electrolysis hydrogen production electrolyzer, characterized in that: It comprises a pole plate, and the pole plate is the pole plate according to any one of claims 1-10.

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