Carbon dioxide electrolysis galvanic pile device

Abstract

The utility model provides a carbon dioxide electrolysis galvanic pile device, which relates to the technical field of carbon dioxide electrolysis, and comprises at least two electrolytic tanks connected in series; the electrolytic tank comprises a cathode plate, a cathode gas diffusion layer, a cathode catalyst layer, a cathode liquid flow plate, a diaphragm, an anode catalyst layer, an anode gas diffusion layer and an anode plate which are arranged in an abutting manner in sequence; the surface, opposite to the cathode gas diffusion layer, of the cathode plate is provided with a carbon dioxide flow channel, the surface, opposite to the anode gas diffusion layer, of the anode plate is provided with a hydrogen flow channel, the cathode liquid flow plate is provided with a hollow liquid flow channel, the cathode catalyst layer and the diaphragm are both opposite to the liquid flow channel, and a cathode electrolyte cavity is formed between the cathode catalyst layer and the diaphragm. The carbon dioxide galvanic pile electrolysis device provided by the utility model relieves the technical problems that the operation time of the existing carbon dioxide electrolysis galvanic pile device is generally relatively low and the electrolysis voltage is high due to the limitation of the service life of the anion exchange membrane in the related technology.

Description

Technical Field

[0001] The utility model relates to the technical field of carbon dioxide electrolysis, in particular to a carbon dioxide electrolysis stack device. Background Art

[0002] The carbon dioxide electroreduction reaction can convert carbon dioxide using renewable electric energy under mild conditions, which can not only reduce the concentration of greenhouse gases in the environment, but also obtain high-value chemicals and storable and transportable fuels, having important scientific significance and application prospects.

[0003] The efficiency of carbon dioxide electroreduction is limited by the limited solubility of carbon dioxide and the competitive hydrogen evolution reaction. Flow cells and MEAs (Membrane Electrode Assembly) avoid the limitation of carbon dioxide solubility, greatly improving the reaction current density and making them ideal electrolyzers for industrialization. However, the MEA electrolytic cell has serious salting out and limited anion exchange membrane life. Therefore, the flow cell has become a reliable configuration suitable for industrial production. The existing flow cells often adopt a two-chamber configuration, only including a cathode gas chamber and an anode electrolyte chamber, and the anion exchange membrane is in direct contact with the cathode, which is limited by the life of the anion exchange membrane. In addition, the existing electrolyzer anodes mostly use oxygen evolution reactions with relatively high overpotentials, resulting in high electrolysis voltages. Currently, the operating time of carbon dioxide electrolysis stack devices is generally low and the energy consumption is high, thus limiting the industrial application of carbon dioxide electroreduction. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a carbon dioxide electrolysis stack device to alleviate the technical problems in the related art that the operating time of the current carbon dioxide electrolysis stack device is generally low and the energy consumption is high due to the limitation of the life of the anion exchange membrane and the high electrolysis voltage.

[0005] The carbon dioxide electrolysis stack device provided by the utility model includes: at least two electrolytic cells, and at least two of the electrolytic cells are connected in series;

[0006] The electrolytic cell includes a cathode plate, a cathode gas diffusion layer, a cathode catalyst layer, a cathode liquid flow plate, a diaphragm, an anode catalyst layer, an anode gas diffusion layer and an anode plate which are sequentially abutted;

[0007] A carbon dioxide flow channel is arranged on the surface of the cathode plate opposite to the cathode gas diffusion layer, a hydrogen flow channel is arranged on the surface of the anode plate opposite to the anode gas diffusion layer, a hollow liquid flow channel is arranged on the cathode liquid flow plate, and both the cathode catalyst layer and the diaphragm are opposite to the liquid flow channel, and a cathode electrolyte chamber is formed between the two.

[0008] Optionally, a plurality of the liquid flow channels are arranged in parallel and spaced apart, and each of the liquid flow channels penetrates the cathode liquid flow plate along the thickness direction of the cathode liquid flow plate;

[0009] The cathode catalyst layer and the diaphragm are both arranged opposite to the plurality of liquid flow channels.

[0010] Optionally, the carbon dioxide flow channel has a width ranging from 0.5 mm to 5 mm and a depth ranging from 0.1 mm to 3 mm.

[0011] Optionally, the hydrogen flow channel has a width ranging from 0.5 mm to 5 mm and a depth ranging from 0.1 mm to 3 mm.

[0012] Optionally, the carbon dioxide flow channel is a single serpentine flow channel.

[0013] Optionally, the hydrogen flow channel is a single serpentine flow channel.

[0014] Optionally, the cathode plate and the anode plate in two adjacent electrolytic cells are integrally connected to form a bipolar plate.

[0015] Optionally, the carbon dioxide electrolysis stack device further includes a cathode end plate and an anode end plate, wherein the cathode end plate abuts against the side wall of the outer cathode plate facing away from the cathode gas diffusion layer, and the anode end plate abuts against the side wall of the outer anode plate facing away from the anode gas diffusion layer.

[0016] Optionally, the cathode end plate, the cathode plate, the cathode liquid flow plate and the bipolar plate are each provided with a first flow channel, a second flow channel, a third flow channel and a fourth flow channel that are connected in a one-to-one correspondence, the first flow channel and the second flow channel are both connected to the carbon dioxide flow channel, and the third flow channel and the fourth flow channel are both connected to the liquid flow channel;

[0017] The anode end plate, the anode plate, the cathode liquid flow plate and the bipolar plate are all provided with a fifth flow channel and a sixth flow channel that are connected in a one-to-one correspondence, and the fifth flow channel and the sixth flow channel are both connected to the hydrogen flow channel.

[0018] Optionally, a first joint communicating with the first flow channel, a second joint communicating with the second flow channel, a third joint communicating with the third flow channel, and a fourth joint communicating with the fourth flow channel are fixedly provided on a side of the cathode end plate facing away from the cathode plate;

[0019] A fifth joint communicating with the fifth flow channel and a sixth joint communicating with the sixth flow channel are fixedly provided on the side of the anode end plate facing away from the anode plate.

[0020] The carbon dioxide electrolysis stack device provided by the present utility model includes at least two electrolytic cells, and at least two electrolytic cells are connected in series; the electrolytic cell includes a cathode plate, a cathode gas diffusion layer, a cathode catalyst layer, a cathode flow plate, a diaphragm, an anode catalyst layer, an anode gas diffusion layer, and an anode plate that are sequentially abutted; a carbon dioxide flow channel is provided on the surface of the cathode plate opposite to the cathode gas diffusion layer, a hydrogen flow channel is provided on the surface of the anode plate opposite to the anode gas diffusion layer, the cathode flow plate is provided with a hollowed liquid flow channel, both the cathode catalyst layer and the diaphragm are opposite to the liquid flow channel, and a cathode electrolyte chamber is formed between the two. By adding a cathode electrolyte chamber between the cathode catalyst layer and the diaphragm, cathode electrolyte can be introduced into the cathode electrolyte chamber. The cathode electrolyte is located between the cathode catalyst layer and the diaphragm to play a role of isolation and buffering, avoiding direct contact between the diaphragm and the cathode electrode, thereby reducing diaphragm damage and possible contamination, and further extending the operating life of the carbon dioxide electrolysis stack device; in addition, the setting of the hydrogen flow channel can use the hydrogen oxidation reaction instead of the traditional water oxidation reaction, which can effectively reduce the electrolytic cell voltage and reduce energy consumption. This enables the diaphragm to use a cation exchange membrane, ensuring the long-term stable operation of the electrolytic cell and significantly improving the operating life of the electrolytic cell; the carbon dioxide flow channel is provided on the cathode plate, and the hydrogen flow channel is provided on the anode plate. By regulating the fluid resistance pressure drop in the flow channel and the resistance pressure drop in the current-limiting channel, the mass transfer rate is increased. Description of the Drawings

[0021] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the related art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the related art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 It is an exploded view of the carbon dioxide electrolysis stack device provided by the embodiment of the present utility model;

[0023] Figure 2 It is a schematic structural diagram of the side of the cathode end plate of the carbon dioxide electrolysis stack device provided by the embodiment of the present utility model that faces away from the cathode;

[0024] Figure 3 It is a schematic structural diagram of the side of the cathode of the carbon dioxide electrolysis stack device provided by the embodiment of the present utility model that faces away from the cathode end plate;

[0025] Figure 4 It is a schematic structural diagram of the side of the cathode flow plate of the carbon dioxide electrolysis stack device provided by the embodiment of the present utility model that faces the cathode plate;

[0026] Figure 5Schematic diagram of the structure of the anode side of the bipolar plate in the carbon dioxide electrolysis stack device provided by the embodiment of the present utility model;

[0027] Figure 6 Schematic diagram of the structure of the cathode side of the bipolar plate in the carbon dioxide electrolysis stack device provided by the embodiment of the present utility model;

[0028] Figure 7 Schematic diagram of the structure of the side of the anode plate facing away from the anode plate in the carbon dioxide electrolysis stack device provided by the embodiment of the present utility model;

[0029] Figure 8 Schematic diagram of the structure of the side of the anode end plate facing the anode in the carbon dioxide electrolysis stack device provided by the embodiment of the present utility model.

[0030] Reference numerals: 100 - cathode plate; 110 - carbon dioxide flow channel; 200 - cathode gas diffusion layer; 300 - cathode catalyst layer; 400 - cathode liquid flow plate; 410 - liquid flow channel; 500 - diaphragm; 600 - anode catalyst layer; 700 - anode gas diffusion layer; 800 - anode plate; 810 - hydrogen flow channel; 900 - bipolar plate; 101 - anode end plate; 102 - cathode end plate; 201 - first flow channel; 202 - second flow channel; 203 - third flow channel; 204 - fourth flow channel; 205 - fifth flow channel; 206 - sixth flow channel. Detailed implementation manners

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0032] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and should not be construed as indicating or implying relative importance.

[0033] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0034] As Figures 1 to 8 shown, the carbon dioxide electrolysis stack device provided by the embodiment of the present utility model includes: at least two electrolytic cells connected in series; each electrolytic cell includes a cathode plate 100, a cathode gas diffusion layer 200, a cathode catalyst layer 300, a cathode flow plate 400, a diaphragm 500, an anode catalyst layer 600, an anode gas diffusion layer 700, and an anode plate 800 which are arranged in contact with each other in sequence; a carbon dioxide flow channel 110 is provided on the surface of the cathode plate 100 opposite to the cathode gas diffusion layer 200, a hydrogen flow channel 810 is provided on the surface of the anode plate 800 opposite to the anode gas diffusion layer 700, a hollow liquid flow channel 410 is provided on the cathode flow plate 400, and both the cathode catalyst layer 300 and the diaphragm 500 are opposite to the liquid flow channel 410, and a cathode electrolyte chamber is formed therebetween.

[0035] Specifically, the cathode plate 100, the cathode gas diffusion layer 200, the cathode catalyst layer 300, the cathode flow plate 400, the diaphragm 500, the anode catalyst layer 600, the anode gas diffusion layer 700, and the anode plate 800 are all rectangular and arranged in sequence, and adjacent components are in contact with each other. A carbon dioxide flow channel 110 with a rectangular cross-section is provided on the surface of the cathode plate 100 opposite to the cathode gas diffusion layer 200, and the cathode gas diffusion layer 200 is opposite to the carbon dioxide flow channel 110. A hydrogen flow channel 810 with a rectangular cross-section is provided on the surface of the anode plate 800 opposite to the anode gas diffusion layer 700, and the anode gas diffusion layer 700 is opposite to the hydrogen flow channel 810. The liquid flow channel 410 is located between the cathode catalyst layer 300 and the diaphragm 500 and can serve as the cathode electrolyte chamber.

[0036] A cathode electrolyte chamber is added between the cathode catalyst layer 300 and the diaphragm 500, and cathode electrolyte can be introduced into the cathode electrolyte chamber. The cathode electrolyte is located between the cathode catalyst layer 300 and the diaphragm 500, playing a role of isolation and buffering, avoiding direct contact between the diaphragm 500 and the cathode electrode, thereby reducing damage and possible contamination of the diaphragm 500, and further extending the operating life of the carbon dioxide electrolysis stack device; in addition, the setting of the hydrogen gas flow channel 810 enables the use of the hydrogen oxidation reaction to replace the traditional water oxidation reaction, which can effectively reduce the electrolytic cell voltage and energy consumption, allowing the diaphragm 500 to use a cation exchange membrane, ensuring the long-term stable operation of the electrolytic cell, and significantly enhancing the operating life of the electrolytic cell; the carbon dioxide flow channel 110 is arranged on the cathode plate 100, and the hydrogen gas flow channel 810 is arranged on the anode plate 800. By regulating the fluid resistance pressure drop in the flow channel and the resistance pressure drop in the current-limiting channel, the mass transfer rate is increased.

[0037] As Figure 4 shown, a plurality of liquid flow channels 410 are arranged in parallel at intervals, and each liquid flow channel 410 penetrates the cathode liquid flow plate 400 along the thickness direction of the cathode liquid flow plate 400; the cathode catalyst layer 300 and the diaphragm 500 are both arranged opposite to the plurality of liquid flow channels 410.

[0038] Specifically, the cathode liquid flow plate 400 is rectangular, and a plurality of liquid flow channels 410 are arranged in parallel at intervals in the vertical direction. The length of each liquid flow channel 410 is less than the length of the cathode liquid flow plate 400 in the horizontal direction. The cathode catalyst layer 300 and the diaphragm 500 are both arranged opposite to the plurality of liquid flow channels 410 and are in contact with the cathode liquid flow plate 400, thereby forming a cathode electrolyte chamber between the cathode catalyst layer 300 and the diaphragm 500. There is a partition structure between adjacent liquid flow channels 410, and the thickness of the partition structure is less than the thickness of other positions of the cathode liquid flow plate 400, so that the cathode electrolyte can flow between the plurality of liquid flow channels 410.

[0039] The width range of the carbon dioxide flow channel 110 is 0.5 mm - 5 mm, and the depth range is 0.1 mm - 3 mm. Specifically, the width of the carbon dioxide flow channel 110 can be 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm or 5 mm, etc., and the depth of the carbon dioxide flow channel 110 can be 0.1 mm, 0.5 mm, 1 mm, 1.5 mm, 2 mm or 3 mm, etc.

[0040] The width of hydrogen flow channel 810 ranges from 0.5 mm to 5 mm, and its depth ranges from 0.1 mm to 3 mm. Specifically, the width of hydrogen flow channel 810 can be 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, or 5 mm, and the depth of hydrogen flow channel 810 can be 0.1 mm, 0.5 mm, 1 mm, 1.5 mm, 2 mm, or 3 mm. By regulating the fluid resistance pressure drop within carbon dioxide flow channel 110 and hydrogen flow channel 810 and the resistance pressure drop within the flow restriction channel, the mass transfer rate is increased. At the same time, the reaction performance is not compromised during the process of expanding the reaction electrode area, thereby improving electrolysis efficiency.

[0041] The carbon dioxide flow channel 110 can be configured as a single serpentine flow channel, multiple serpentine flow channels, or multiple straight flow channels. In this embodiment, the carbon dioxide flow channel 110 is a single serpentine flow channel. Carbon dioxide can flow into the carbon dioxide flow channel 110 from one end and out from the other end, making it easy to control the flow of carbon dioxide.

[0042] The hydrogen flow channel 810 can be configured as a single serpentine flow channel, multiple serpentine flow channels, or multiple straight flow channels. In this embodiment, the hydrogen flow channel 810 is a single serpentine flow channel. Hydrogen can flow into the hydrogen flow channel 810 from one end and out from the other end, making it easy to control the flow of hydrogen.

[0043] In some embodiments, multiple electrolytic cells are provided independently of each other. In one embodiment of the present application, the cathode plate 100 and the anode plate 800 in two adjacent electrolytic cells are integrally connected to form a bipolar plate 900 .

[0044] like Figure 1 As shown, the bipolar plate 900 is rectangular and is located between the cathode gas diffusion layer 200 and the anode gas diffusion layer 700 in two adjacent electrolytic cells. The side of the bipolar plate 900 facing the cathode gas diffusion layer 200 in one electrolytic cell is the cathode side, and the side of the bipolar plate 900 facing the anode gas diffusion layer 700 in the other electrolytic cell is the anode side. The cathode side of the bipolar plate 900 is provided with a carbon dioxide flow channel 110, and the anode side of the bipolar plate 900 is provided with a hydrogen flow channel 810. In the carbon dioxide electrolysis stack device provided by the embodiment of the present invention, multiple electrolytic cells are connected in series, which can increase the reaction electrode area. In addition, adjacent electrolytic cells share the bipolar plate 900, which can simplify the structure of the carbon dioxide electrolysis stack device and facilitate assembly.

[0045] The carbon dioxide electrolysis stack device provided by the embodiment of the present invention also includes a cathode end plate 102 and an anode end plate 101. The cathode end plate 102 abuts against the side wall of the outer cathode plate 100 facing away from the cathode gas diffusion layer 200, and the anode end plate 101 abuts against the side wall of the outer anode plate 800 facing away from the anode gas diffusion layer 700.

[0046] When two adjacent electrolytic cells share a bipolar plate 900, the carbon dioxide electrolysis stack device includes a cathode end plate 102 and an anode end plate 101. Figure 1 As shown, the cathode end plate 102 and the anode end plate 101 are both rectangular and spaced apart. Multiple electrolytic cells are located between the cathode end plate 102 and the anode end plate 101. The cathode end plate 102 abuts the side wall of the outer cathode plate 100 facing away from the cathode gas diffusion layer 200, and the anode end plate 101 abuts the side wall of the outer anode plate 800 facing away from the anode gas diffusion layer 700. The cathode end plate 102 and the anode end plate 101 cooperate to secure and protect the carbon dioxide electrolysis stack.

[0047] like Figures 2 to 8 As shown, the cathode end plate 102, the cathode plate 100, the cathode liquid flow plate 400 and the bipolar plate 900 are all provided with a first flow channel 201, a second flow channel 202, a third flow channel 203 and a fourth flow channel 204 that are connected in a one-to-one manner. The first flow channel 201 and the second flow channel 202 are both connected to the carbon dioxide flow channel 110, and the third flow channel 203 and the fourth flow channel 204 are both connected to the liquid flow channel 410; the anode end plate 101, the anode plate 800, the cathode liquid flow plate 400 and the bipolar plate 900 are all provided with a fifth flow channel 205 and a sixth flow channel 206 that are connected in a one-to-one manner. The fifth flow channel 205 and the sixth flow channel 206 are both connected to the hydrogen flow channel 810.

[0048] The first flow channel 201 and the second flow channel 202 are distributed along the first diagonal line. The cathode plate 100 and the bipolar plate 900 are provided with a first connecting structure and a second connecting structure. The first flow channel 201 is connected to the inlet of the carbon dioxide flow channel 110 through the first connecting structure, and the second flow channel 202 is connected to the outlet of the carbon dioxide flow channel 110 through the second connecting structure. The first connecting structure and the second connecting structure can both be set as grooves or channels.

[0049] The third flow channel 203 and the fourth flow channel 204 are spaced apart in the vertical direction. A third connecting structure and a fourth connecting structure are provided on the cathode liquid flow plate 400. The third flow channel is connected to one end of the liquid flow channel 410 through the third connecting structure. The fourth flow channel 204 is connected to the other end of the liquid flow channel 410 through the fourth connecting structure. Both the third connecting structure and the fourth connecting structure can be set as grooves or channels.

[0050] The fifth flow channel 205 and the sixth flow channel 206 are distributed along the second diagonal line, and the second diagonal line is set at an angle to the first diagonal line. The anode plate 800 and the bipolar plate 900 are provided with a fifth connecting structure and a sixth connecting structure. The fifth flow channel 205 is connected to the inlet of the hydrogen flow channel 810 through the fifth connecting structure, and the sixth flow channel 206 is connected to the outlet of the hydrogen flow channel 810 through the sixth connecting structure. The fifth connecting structure and the sixth connecting structure can both be set as grooves or channels.

[0051] Carbon dioxide enters the carbon dioxide flow channel 110 through the first flow channel 201 and is discharged from the second flow channel 202. The cathode electrolyte enters the liquid flow channel 410 through the third flow channel 203 and is discharged from the fourth flow channel 204. Hydrogen enters the hydrogen flow channel 810 through the fifth flow channel 205 and is discharged from the sixth flow channel 206. The arrangement of multiple flow channels enables carbon dioxide, hydrogen, and the cathode electrolyte to enter and exit the carbon dioxide electrolysis stack device simultaneously.

[0052] On the side of the cathode end plate 102 facing away from the cathode plate 100, a first connector communicating with the first flow channel 201, a second connector communicating with the second flow channel 202, a third connector communicating with the third flow channel 203, and a fourth connector communicating with the fourth flow channel 204 are fixedly provided; on the side of the anode end plate 101 facing away from the anode plate 800, a fifth connector communicating with the fifth flow channel 205 and a sixth connector communicating with the sixth flow channel 206 are fixedly provided.

[0053] External pipelines can be connected to the carbon dioxide electrolysis stack device through corresponding connectors, facilitating the introduction of gases or solutions into the carbon dioxide electrolysis stack device through the corresponding pipelines.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A carbon dioxide electrolysis stack device, characterized in that, include: At least two electrolytic cells, at least two of the electrolytic cells are connected in series; The electrolytic cell comprises a cathode plate (100), a cathode gas diffusion layer (200), a cathode catalyst layer (300), a cathode liquid flow plate (400), a diaphragm (500), an anode catalyst layer (600), an anode gas diffusion layer (700), and an anode plate (800) which are sequentially arranged in abutment with each other; The surface of the cathode plate (100) opposite to the cathode gas diffusion layer (200) is provided with a carbon dioxide flow channel (110), the surface of the anode plate (800) opposite to the anode gas diffusion layer (700) is provided with a hydrogen flow channel (810), the cathode liquid flow plate (400) is provided with a hollow liquid flow channel (410), the cathode catalyst layer (300) and the diaphragm (500) are both opposite to the liquid flow channel (410), and a cathode electrolyte chamber is formed between the two.

2. The carbon dioxide electrolysis stack device according to claim 1, wherein The plurality of liquid flow channels (410) are arranged in parallel and spaced apart, and each of the liquid flow channels (410) penetrates the cathode liquid flow plate (400) along the thickness direction of the cathode liquid flow plate (400); The cathode catalyst layer (300) and the diaphragm (500) are both arranged opposite to the plurality of liquid flow channels (410).

3. The carbon dioxide electrolysis stack device according to claim 1, characterized in that, The carbon dioxide flow channel (110) has a width ranging from 0.5 mm to 5 mm and a depth ranging from 0.1 mm to 3 mm.

4. The carbon dioxide electrolysis stack device according to claim 1, characterized in that, The hydrogen flow channel (810) has a width ranging from 0.5 mm to 5 mm and a depth ranging from 0.1 mm to 3 mm.

5. The carbon dioxide electrolysis stack device according to claim 1, wherein The carbon dioxide flow channel (110) is a single serpentine flow channel.

6. The carbon dioxide electrolysis stack device according to claim 1, characterized in that, The hydrogen flow channel (810) is a single serpentine flow channel.

7. The carbon dioxide electrolysis stack device according to any one of claims 1-6, characterized in that, The cathode plates (100) and anode plates (800) in two adjacent electrolytic cells are integrally connected to form a bipolar plate (900).

8. The carbon dioxide electrolysis stack device according to claim 7, characterized in that, The carbon dioxide electrolysis stack device further comprises a cathode end plate (102) and an anode end plate (101), wherein the cathode end plate (102) abuts against a side wall of the cathode plate (100) on the outside that faces away from the cathode gas diffusion layer (200), and the anode end plate (101) abuts against a side wall of the anode plate (800) on the outside that faces away from the anode gas diffusion layer (700).

9. The carbon dioxide electrolysis stack device according to claim 8, wherein, The cathode end plate (102), the cathode plate (100), the cathode liquid flow plate (400) and the bipolar plate (900) are each provided with a first flow channel (201), a second flow channel (202), a third flow channel (203) and a fourth flow channel (204) that are connected in a one-to-one correspondence; the first flow channel (201) and the second flow channel (202) are both connected to the carbon dioxide flow channel (110), and the third flow channel (203) and the fourth flow channel (204) are both connected to the liquid flow channel (410); The anode end plate (101), the anode plate (800), the cathode liquid flow plate (400) and the bipolar plate (900) are all provided with a fifth flow channel (205) and a sixth flow channel (206) that are connected in a one-to-one correspondence, and the fifth flow channel (205) and the sixth flow channel (206) are both connected to the hydrogen flow channel (810).

10. The carbon dioxide electrolysis stack device according to claim 9, characterized in that, On the side of the negative electrode end plate (102) facing away from the negative electrode plate (100), a first joint communicating with the first flow channel (201), a second joint communicating with the second flow channel (202), a third joint communicating with the third flow channel (203), and a fourth joint communicating with the fourth flow channel (204) are fixedly provided; On the side of the positive electrode end plate (101) facing away from the positive electrode plate (800), a fifth joint communicating with the fifth flow channel (205) and a sixth joint communicating with the sixth flow channel (206) are fixedly provided.

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