Bipolar plate, electrolytic cell, and hydrogen production device

Abstract

The invention relates to the technical field of hydrogen production, and discloses a bipolar plate, an electrolytic bath and a hydrogen production device.The bipolar plate comprises a cathode plate body and an anode plate body, the back faces of the cathode plate body and the anode plate body are attached and connected, and the bipolar plate is provided with a hydrogen outlet through hole, a water inlet through hole and a water outlet through hole which all penetrate through the cathode plate body and the anode plate body; the cathode plate body is provided with a cathode flow field and a hydrogen outlet gap communicated with the hydrogen outlet end of the cathode flow field, a hydrogen outlet channel is formed between the back face of the cathode plate body and the back face of the anode plate body, the hydrogen outlet channel is communicated with the hydrogen outlet gap and the hydrogen outlet through hole, and the anode plate body is provided with a water inlet gap, a water outlet gap and an anode flow field. The water inlet gap and the water outlet gap are respectively communicated with the water inlet end and the water outlet end of the anode flow field, a water inlet channel and a water outlet channel are formed between the back surface of the anode plate body and the back surface of the cathode plate body, the water inlet channel is communicated with the water inlet gap and the water inlet through hole, and the water outlet channel is communicated with the water outlet gap and the water outlet through hole. The bipolar plate disclosed by the invention has a good sealing effect, few sealing elements and low assembly difficulty.

Description

Technical Field

[0001] The present invention belongs to the technical field of hydrogen production, and in particular, relates to a bipolar plate, an electrolyzer and a hydrogen production device. Background Art

[0002] The bipolar plate is the core component of the water electrolysis hydrogen production device, and its main functions are mass transfer, conductivity and fixed support.

[0003] An anode flow field and a cathode flow field are respectively provided on both sides of the bipolar plate. Water flows from the water inlet through-hole of the bipolar plate through the water inlet channel into the anode flow field. Oxygen generated by the reaction in the anode flow field flows with the water through the water outlet channel and flows out from the water outlet through-hole. Hydrogen generated by the reaction in the cathode flow field flows out from the hydrogen outlet channel through the hydrogen outlet through-hole. Since the water inlet channel, the water outlet channel and the hydrogen outlet channel are generally formed on both sides of the bipolar plate, in order to avoid fluid leakage, seals are usually added on both sides of the bipolar plate to seal the water inlet channel, the water outlet channel and the hydrogen outlet channel, such as welding a sealing cover plate or covering a plastic pole frame, etc. However, this type of sealing method has the problems of more seals, high assembly difficulty and more leakage risk points. Summary of the invention

[0004] In view of the above-mentioned deficiencies or defects in the prior art, the present invention provides a bipolar plate, an electrolyzer and a hydrogen production device, aiming to solve the technical problems that the existing bipolar plates require a large number of seals, are difficult to assemble and have many leakage risk points.

[0005] To achieve the above object, the present invention provides a bipolar plate, comprising a cathode plate body and an anode plate body which are bonded to each other at the back and sealed, wherein the bipolar plate is provided with a hydrogen outlet through hole, a water inlet through hole and a water outlet through hole which all penetrate the cathode plate body and the anode plate body.

[0006] The cathode plate body is provided with a cathode flow field formed on the front side and a hydrogen outlet gap connected to the hydrogen outlet end of the cathode flow field, a hydrogen outlet channel is formed between the back side of the cathode plate body and the back side of the anode plate body, and the hydrogen outlet channel connects the hydrogen outlet gap and the hydrogen outlet through hole,

[0007] The anode plate body is provided with a water inlet gap, a water outlet gap and an anode flow field formed on the front side, the water inlet gap and the water outlet gap are respectively connected with the water inlet end and the water outlet end of the anode flow field, and a water inlet channel and a water outlet channel are formed between the back side of the anode plate body and the back side of the cathode plate body, the water inlet channel connects the water inlet gap and the water inlet through-hole, and the water outlet channel connects the water outlet gap and the water outlet through-hole.

[0008] Optionally, the cathode plate body and the anode plate body are sealed and connected by welding.

[0009] Optionally, the cathode plate body and the anode plate body respectively include a central area and an edge area surrounding the central area, the cathode flow field is formed in the central area of ​​the cathode plate body, the hydrogen outlet gap and the hydrogen outlet channel are formed in the edge area of ​​the cathode plate body, the anode flow field is arranged in the central area of ​​the anode plate body, the water inlet gap, the water outlet gap, the water inlet channel and the water outlet channel are all formed in the edge area of ​​the anode plate body, the hydrogen outlet through hole, the water inlet through hole and the water outlet through hole are all formed through the edge area of ​​the cathode plate body and the edge area of ​​the anode plate body, wherein the central area of ​​the cathode plate body and the central area of ​​the anode plate body are arranged in alignment, and the edge area of ​​the cathode plate body and the edge area of ​​the anode plate body are arranged in alignment and welded to each other.

[0010] Optionally, a first groove is formed on the back of the cathode plate body, and the first groove and the back of the anode plate body define the hydrogen outlet channel;

[0011] And / or, a second groove and a third groove are formed on the back side of the anode plate body, and the second groove and the third groove define the water outlet channel and the water inlet channel with the back side of the cathode plate body, respectively.

[0012] Optionally, the hydrogen outlet channel gradually narrows from one end communicating with the hydrogen outlet gap to the other end communicating with the hydrogen outlet through hole;

[0013] And / or, the water inlet channel gradually expands outward from one end communicating with the water inlet through hole to the other end communicating with the water inlet gap;

[0014] And / or, the water outlet channel gradually narrows from one end communicating with the water outlet gap to the other end communicating with the water outlet through hole.

[0015] Optionally, the hydrogen outlet end of the cathode flow field is arranged in the width direction of the bipolar plate, the hydrogen outlet through hole is arranged in alignment with the hydrogen outlet end of the cathode flow field in the width direction of the bipolar plate, the water inlet end and the water outlet end of the anode flow field are arranged in the length direction of the bipolar plate, and the water inlet through hole and the water outlet through hole are arranged in alignment with the water inlet end and the water outlet end of the anode flow field in the length direction of the bipolar plate.

[0016] Optionally, the bipolar plate is provided with a plurality of the hydrogen outlet through holes, the plurality of the hydrogen outlet through holes are arranged at intervals along the length direction of the bipolar plate, the cathode plate body is provided with a plurality of the hydrogen outlet slits, the plurality of the hydrogen outlet slits are directly connected to the hydrogen outlet end of the cathode flow field and are arranged at intervals along the length direction of the bipolar plate, and the plurality of the hydrogen outlet slits are respectively connected to the plurality of the hydrogen outlet through holes;

[0017] And / or, the bipolar plate is provided with a plurality of the water inlet through holes and a plurality of the water outlet through holes, the plurality of the water inlet through holes are arranged at intervals along the width direction of the bipolar plate, the anode plate body is provided with a plurality of the water inlet slits, the plurality of the water inlet slits are directly connected to the water inlet end of the anode flow field and are arranged at intervals along the width direction of the bipolar plate, the plurality of the water inlet slits are respectively connected to the plurality of the water inlet through holes, the plurality of the water outlet through holes are arranged at intervals along the width direction of the bipolar plate, the anode plate body is provided with a plurality of the water outlet slits, the plurality of the water outlet slits are directly connected to the water outlet end of the anode flow field and are arranged at intervals along the width direction of the bipolar plate, and the plurality of the water outlet slits are respectively connected to the plurality of the water outlet through holes.

[0018] Optionally, a first edge sealing groove and a first through-hole sealing groove are formed on the front side of the cathode plate body, the first edge sealing groove is arranged along the edge of the cathode plate body, the first through-hole sealing groove is arranged around the hydrogen outlet through-hole, the water inlet through-hole and the water outlet through-hole, and rubber sealing pads are provided in the first edge sealing groove and the first through-hole sealing groove;

[0019] And / or, a second edge sealing groove and a second through hole sealing groove are formed on the front side of the anode plate body, the second edge sealing groove is arranged along the edge of the anode plate body, the second through hole sealing groove is arranged around the hydrogen outlet through hole, the water inlet through hole and the water outlet through hole, and rubber sealing pads are provided in the second edge sealing groove and the second through hole sealing groove.

[0020] The present invention also provides an electrolytic cell, comprising the bipolar plate mentioned above.

[0021] The present invention also provides a hydrogen production device, comprising the above-mentioned electrolyzer.

[0022] Through the above technical scheme, in the bipolar plate of the present invention, the hydrogen outlet channel, the water inlet channel and the water outlet channel are all formed between the back side of the cathode plate body and the back side of the anode plate body, and the back side of the cathode plate body and the back side of the anode plate body are mutually attached and sealed. In this way, the hydrogen outlet channel, the water inlet channel and the water outlet channel are hidden inside the bipolar plate. In this way, the leakage risk points can be greatly reduced and the sealing effect can be improved. In addition, the sealing treatment can be achieved without setting corresponding seals for the hydrogen outlet channel, the water inlet channel and the water outlet channel, which can reduce the seals and reduce the difficulty of assembly. In addition, the bipolar plate is formed by sealingly connecting the two plates of the cathode plate body and the anode plate body, and the hydrogen outlet channel, the water inlet channel and the water outlet channel are formed between the back side of the cathode plate body and the back side of the anode plate body. In this way, when making the bipolar plate, the hydrogen outlet channel, the water inlet channel and the water outlet channel can be first processed between the back side of the cathode plate body and the back side of the anode plate body, and then the cathode plate body and the anode plate body are sealed and connected. The processing difficulty and cost are low, the overall thickness of the bipolar plate is not required to be high, and the thickness of the bipolar plate can be designed to be thinner.

[0023] Other features and advantages of the present invention will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but do not constitute a limitation of the present invention.

[0025] In the attached picture:

[0026] Figure 1 is a schematic diagram of the exploded structure of a bipolar plate in an embodiment of the present invention;

[0027] Figure 2 for Figure 1 A front view of the cathode plate body in FIG.

[0028] Figure 3 for Figure 1 A back view of the cathode plate body in FIG.

[0029] Figure 4 for Figure 1 A front view of the anode plate body in FIG.

[0030] Figure 5 for Figure 1 Back view of the anode plate in FIG.

[0031] Description of reference numerals:

[0032] 1 Cathode plate

[0033] 11 Cathode flow field 12 Hydrogen outlet gap

[0034] 13 first edge sealing groove 14 first through hole sealing groove

[0035] 2 Anode plate

[0036] 21 Anode flow field 22 Water inlet gap

[0037] 23 Water outlet gap 24 Second edge sealing groove

[0038] 25 Second through hole sealing groove

[0039] 3 Hydrogen outlet hole

[0040] 4 Water inlet hole

[0041] 5 Water outlet hole

[0042] 6 Hydrogen outlet channel

[0043] 7 Water inlet channel

[0044] 8 Water outlet DETAILED DESCRIPTION

[0045] The specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0046] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0047] In the present invention, unless otherwise specified, the directions or positional relationships indicated by directional words such as "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the embodiments of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0048] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0049] See attached Figure 1 To Attachment Figure 5 As shown, the first exemplary embodiment of the present invention provides a bipolar plate, the bipolar plate includes a cathode plate body 1 and an anode plate body 2 which are bonded and sealed at the back, and the bipolar plate is provided with a hydrogen outlet through hole 3, a water inlet through hole 4 and a water outlet through hole 5 which all penetrate the cathode plate body 1 and the anode plate body 2.

[0050] The cathode plate body 1 is provided with a cathode flow field 11 formed on the front and a hydrogen outlet gap 12 connected to the hydrogen outlet end of the cathode flow field 11. A hydrogen outlet channel 6 is formed between the back of the cathode plate body 1 and the back of the anode plate body 2. The hydrogen outlet channel 6 connects the hydrogen outlet gap 12 and the hydrogen outlet through hole 3.

[0051] The anode plate body 2 is provided with a water inlet gap 22, a water outlet gap 23 and an anode flow field 21 formed on the front. The water inlet gap 22 and the water outlet gap 23 are respectively connected to the water inlet end and the water outlet end of the anode flow field 21. A water inlet channel 7 and a water outlet channel 8 are formed between the back side of the anode plate body 2 and the back side of the cathode plate body 1. The water inlet channel 7 connects the water inlet gap 22 and the water inlet through hole 4, and the water outlet channel 8 connects the water outlet gap 23 and the water outlet through hole 5.

[0052] It can be understood that in actual application, on the side of the anode plate body 2, water flows from the water inlet through hole 4 through the water inlet channel 7 and the water inlet gap 22 into the anode flow field 21. After reacting in the anode flow field 21 to generate oxygen, the oxygen flows with the water through the water outlet gap 23 and the water outlet channel 8 into the water outlet through hole 5, thereby flowing out of the bipolar plate; on the side of the cathode plate body 1, the hydrogen generated by the reaction in the cathode flow field 11 flows through the hydrogen outlet gap 12 and the hydrogen outlet channel 6 into the hydrogen outlet through hole 3, thereby flowing out of the bipolar plate.

[0053] It can be understood that the cathode flow field 11 and the anode flow field 21 are respectively formed by a plurality of flow channels, and the specific structure and working principle are well known to those skilled in the art, and therefore, they are not described in detail here.

[0054] In the above-mentioned bipolar plate, the hydrogen outlet channel 6, the water inlet channel 7 and the water outlet channel 8 are all formed between the back side of the cathode plate body 1 and the back side of the anode plate body 2, and the back side of the cathode plate body 1 and the back side of the anode plate body 2 are mutually attached and sealed. In this way, the hydrogen outlet channel 6, the water inlet channel 7 and the water outlet channel 8 are hidden inside the bipolar plate. In this way, the leakage risk points can be greatly reduced, the sealing effect can be improved, and the sealing treatment can be achieved without setting corresponding sealing parts for the hydrogen outlet channel 6, the water inlet channel 7 and the water outlet channel 8, which can reduce the number of sealing parts and reduce the difficulty of assembly. In addition, the bipolar plate The electrode plate is formed by sealingly connecting two plates, a cathode plate body 1 and an anode plate body 2, and a hydrogen outlet channel 6, a water inlet channel 7 and a water outlet channel 8 are formed between the back side of the cathode plate body 1 and the back side of the anode plate body 2. With such an arrangement, when manufacturing the bipolar plate, the hydrogen outlet channel 6, the water inlet channel 7 and the water outlet channel 8 can be first processed between the back side of the cathode plate body 1 and the back side of the anode plate body 2, and then the cathode plate body 1 and the anode plate body 2 are sealed and connected. The processing difficulty and cost are low, and the overall thickness of the bipolar plate is not required to be high. The thickness of the bipolar plate can be designed to be thinner, and the general thickness can be designed to be less than 3 mm.

[0055] In one embodiment, the cathode plate body 1 and the anode plate body 2 are sealed and connected by welding. In this way, a sealed connection between the cathode plate body 1 and the anode plate body 2 can be achieved, and a good sealing effect can be achieved.

[0056] Specifically, the cathode plate body 1 and the anode plate body 2 can be sealed and connected by laser welding, which has low welding cost and high welding precision.

[0057] Further, see Attachment Figure 1 To Attachment Figure 5 As shown, the cathode plate body 1 and the anode plate body 2 respectively include a central area and an edge area surrounding the central area, the cathode flow field 11 is formed in the central area of ​​the cathode plate body 1, the hydrogen outlet gap 12 and the hydrogen outlet channel 6 are formed in the edge area of ​​the cathode plate body 1, the anode flow field 21 is arranged in the central area of ​​the anode plate body 2, the water inlet gap 22, the water outlet gap 23, the water inlet channel 7 and the water outlet channel 8 are all formed in the edge area of ​​the anode plate body 2, the hydrogen outlet through hole 3, the water inlet through hole 4 and the water outlet through hole 5 are all formed through the edge area of ​​the cathode plate body 1 and the edge area of ​​the anode plate body 2, wherein the central area of ​​the cathode plate body 1 and the central area of ​​the anode plate body 2 are arranged in alignment, and the edge area of ​​the cathode plate body 1 and the edge area of ​​the anode plate body 2 are arranged in alignment and welded to each other.

[0058] It can be understood that the edge area of ​​the cathode plate body 1 and the edge area of ​​the anode plate body 2 are welded together, and each channel, through hole and gap are located in the edge area. Such an arrangement can further improve the sealing effect between the cathode plate body 1 and the anode plate body 2.

[0059] In one embodiment, referring to the attached Figure 3 As shown, a first groove is formed on the back of the cathode plate body 1 , and the first groove and the back of the anode plate body 2 define a hydrogen outlet channel 6 .

[0060] In the process of manufacturing the bipolar plate, a first groove can be processed on the back of the cathode plate body 1, and then the cathode plate body 1 and the anode plate body 2 are bonded and connected. In this way, a hydrogen outlet channel 6 can be formed between the back of the cathode plate body 1 and the back of the anode plate body 2, and the processing difficulty is relatively low.

[0061] In one embodiment, referring to the attached Figure 5 As shown, the back side of the anode plate body 2 is concavely provided with a second groove and a third groove, and the second groove and the third groove define a water outlet channel 8 and a water inlet channel 7 with the back side of the cathode plate body 1 respectively.

[0062] In the process of manufacturing bipolar plates, the second groove and the third groove can be first processed on the back of the anode plate body 2, and then the cathode plate body 1 and the anode plate body 2 are bonded and connected. In this way, a water outlet channel 8 and a water inlet channel 7 can be formed between the back of the cathode plate body 1 and the back of the anode plate body 2, and the processing difficulty is relatively low.

[0063] In one embodiment, as shown in FIG. 3 , the hydrogen outlet channel 6 gradually narrows from one end connected to the hydrogen outlet gap 12 to the other end connected to the hydrogen outlet through hole 3. In this way, hydrogen can be gathered to the hydrogen outlet through hole 3 through the hydrogen outlet channel 6 for discharge, effectively improving the hydrogen discharge efficiency.

[0064] In one embodiment, referring to the attached Figure 5 As shown, the water inlet channel 7 gradually expands from one end connected to the water inlet through hole 4 to the other end connected to the water inlet gap 22. With such a configuration, the water flow can flow into the water inlet gap 22 in a uniformly dispersed form through the water inlet channel 7, thereby improving the uniformity of the water flow passing through the anode flow field 21 and improving the reaction efficiency.

[0065] In one embodiment, referring to the attached Figure 5 As shown, the water outlet channel 8 gradually narrows from one end connected to the water outlet gap 23 to the other end connected to the water outlet through hole 5. In this way, the water outlet channel 8 can gather oxygen and water flow to the water outlet through hole 5 for discharge, effectively improving the discharge efficiency of oxygen and water flow.

[0066] In one embodiment, referring to the attached Figure 1 To Attachment Figure 5 As shown, the hydrogen outlet end of the cathode flow field 11 is arranged in the width direction of the bipolar plate, the hydrogen outlet through hole 3 is arranged in alignment with the hydrogen outlet end of the cathode flow field 11 in the width direction of the bipolar plate, the water inlet end and the water outlet end of the anode flow field 21 are arranged in the length direction of the bipolar plate, and the water inlet through hole 4 and the water outlet through hole 5 are arranged in alignment with the water inlet end and the water outlet end of the anode flow field 21 in the length direction of the bipolar plate. In this way, the hydrogen outlet direction of the cathode flow field 11 is arranged perpendicular to the water inlet and outlet direction of the anode flow field 21. In this way, the arrangement positions of the hydrogen outlet gap 12, the hydrogen outlet channel 6 and the hydrogen outlet through hole 3 can be completely staggered with the arrangement positions of the water inlet gap 22, the water outlet gap 23, the water inlet channel 7, the water outlet channel 8, the water inlet through hole 4 and the water outlet through hole 5, and they do not interfere with each other, effectively improving the rationality of the layout of each channel, each gap and each through hole on the bipolar plate.

[0067] Further, see Attachment Figure 1 To Attachment Figure 5As shown, the bipolar plate is provided with a plurality of hydrogen outlet through holes 3, which are arranged at intervals along the length direction of the bipolar plate, and the cathode plate body 1 is provided with a plurality of hydrogen outlet gaps 12, which are directly connected to the hydrogen outlet end of the cathode flow field 11 and are arranged at intervals along the length direction of the bipolar plate, and the plurality of hydrogen outlet gaps 12 are respectively connected to the plurality of hydrogen outlet through holes 3.

[0068] It can be understood that the hydrogen output efficiency can be effectively improved by providing a plurality of hydrogen output gaps 12 and a plurality of hydrogen output through holes 3 .

[0069] Specifically, the cathode flow field 11 has two hydrogen outlet ends in the width direction of the bipolar plate, and the two hydrogen outlet ends are respectively configured with a corresponding plurality of hydrogen outlet gaps 12 and a plurality of hydrogen outlet through holes 3, so that the hydrogen outlet efficiency can be ensured.

[0070] Further, see Attachment Figure 1 To Attachment Figure 5 As shown, the bipolar plate is provided with a plurality of water inlet through holes 4 and a plurality of water outlet through holes 5, the plurality of water inlet through holes 4 are arranged at intervals along the width direction of the bipolar plate, the anode plate body 2 is provided with a plurality of water inlet slits 22, the plurality of water inlet slits 22 are directly connected to the water inlet end of the anode flow field 21 and are arranged at intervals along the width direction of the bipolar plate, the plurality of water inlet slits 22 are respectively connected to the plurality of water inlet through holes 4, the plurality of water outlet through holes 5 are arranged at intervals along the width direction of the bipolar plate, the anode plate body 2 is provided with a plurality of water outlet slits 23, the plurality of water outlet slits 23 are directly connected to the water outlet end of the anode flow field 21 and are arranged at intervals along the width direction of the bipolar plate, the plurality of water outlet slits 23 are respectively connected to the plurality of water outlet through holes 5.

[0071] It can be understood that the water inlet efficiency can be effectively improved by providing a plurality of water inlet through holes 4 and a plurality of water inlet gaps 22 , and the water outlet efficiency can be effectively improved by providing a plurality of water outlet gaps 23 and a plurality of water outlet through holes 5 .

[0072] In one embodiment, referring to the attached Figure 2 As shown, a first edge sealing groove 13 and a first through hole sealing groove 14 are formed on the front side of the cathode plate body 1. The first edge sealing groove 13 is arranged along the edge of the cathode plate body 1, and the first through hole sealing groove 14 is arranged around the hydrogen outlet through hole 3, the water inlet through hole 4 and the water outlet through hole 5. Rubber sealing pads are provided in the first edge sealing groove 13 and the first through hole sealing groove 14.

[0073] In actual application, the sealing effect of the rubber sealing gasket can ensure the sealing between two adjacent bipolar plates, and compared with the use of PTFE material for sealing in the prior art, the assembly tolerance requirement is lower, which can reduce the production cost.

[0074] In one embodiment, as shown in reference 4, a second edge sealing groove 24 and a second through hole sealing groove 25 are formed on the front side of the anode plate body 2, the second edge sealing groove 24 is arranged along the edge of the anode plate body 2, and the second through hole sealing groove 25 is arranged around the hydrogen outlet through hole 3, the water inlet through hole 4 and the water outlet through hole 5, and rubber sealing pads are provided in the second edge sealing groove 24 and the second through hole sealing groove 25.

[0075] In actual application, the sealing effect of the rubber sealing gasket can ensure the sealing between two adjacent bipolar plates, and compared with the use of PTFE material for sealing in the prior art, the assembly tolerance requirement is lower, which can reduce the production cost.

[0076] A second exemplary embodiment of the present invention provides an electrolytic cell including the bipolar plate described above.

[0077] Obviously, the electrolytic cell also has the beneficial effects of the above-mentioned bipolar plates, which will not be elaborated here.

[0078] A third exemplary embodiment of the present invention provides a hydrogen production device, comprising the above-mentioned electrolyzer.

[0079] Obviously, the hydrogen production device also has the beneficial effects of the above-mentioned electrolyzer, which will not be described in detail here.

[0080] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0081] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0082] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0083] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A bipolar plate, characterized in that: The bipolar plate comprises a cathode plate body (1) and an anode plate body (2) which are bonded to each other at the back and sealed, wherein the bipolar plate is provided with a hydrogen outlet through hole (3), a water inlet through hole (4) and a water outlet through hole (5) which all penetrate the cathode plate body (1) and the anode plate body (2). The cathode plate body (1) is provided with a cathode flow field (11) formed on the front side and a hydrogen outlet gap (12) connected to the hydrogen outlet end of the cathode flow field (11); a hydrogen outlet channel (6) is formed between the back side of the cathode plate body (1) and the back side of the anode plate body (2); the hydrogen outlet channel (6) connects the hydrogen outlet gap (12) and the hydrogen outlet through hole (3); The anode plate body (2) is provided with a water inlet slit (22), a water outlet slit (23) and an anode flow field (21) formed on the front side; the water inlet slit (22) and the water outlet slit (23) are respectively connected to the water inlet end and the water outlet end of the anode flow field (21); a water inlet channel (7) and a water outlet channel (8) are formed between the back side of the anode plate body (2) and the back side of the cathode plate body (1); the water inlet channel (7) is connected to the water inlet slit (22) and the water inlet through hole (4); and the water outlet channel (8) is connected to the water outlet slit (23) and the water outlet through hole (5).

2. The bipolar plate according to claim 1, characterized in that: The cathode plate body (1) and the anode plate body (2) are sealed and connected by welding.

3. The bipolar plate according to claim 2, characterized in that: The cathode plate body (1) and the anode plate body (2) respectively include a central area and an edge area surrounding the central area, the cathode flow field (11) is formed in the central area of ​​the cathode plate body (1), the hydrogen outlet gap (12) and the hydrogen outlet channel (6) are formed in the edge area of ​​the cathode plate body (1), the anode flow field (21) is arranged in the central area of ​​the anode plate body (2), the water inlet gap (22), the water outlet gap (23), the water inlet channel (7) and the water outlet channel (8) are all formed in the edge area of ​​the anode plate body (2), the hydrogen outlet through hole (3), the water inlet through hole (4) and the water outlet through hole (5) are all formed through the edge area of ​​the cathode plate body (1) and the edge area of ​​the anode plate body (2), wherein the central area of ​​the cathode plate body (1) and the central area of ​​the anode plate body (2) are arranged in alignment, and the edge area of ​​the cathode plate body (1) and the edge area of ​​the anode plate body (2) are arranged in alignment and welded to each other.

4. The bipolar plate according to claim 1, characterized in that: The back side of the cathode plate body (1) is provided with a first groove, and the first groove and the back side of the anode plate body (2) define the hydrogen outlet channel (6); And / or, the back side of the anode plate body (2) is provided with a second groove and a third groove, and the second groove and the third groove respectively define the water outlet channel (8) and the water inlet channel (7) with the back side of the cathode plate body (1).

5. The bipolar plate according to claim 1, characterized in that: The hydrogen outlet channel (6) gradually narrows from one end communicating with the hydrogen outlet gap (12) to the other end communicating with the hydrogen outlet through hole (3); And / or, the water inlet channel (7) gradually expands outward from one end communicating with the water inlet through hole (4) to the other end communicating with the water inlet gap (22); And / or, the water outlet channel (8) gradually narrows from one end communicating with the water outlet gap (23) to the other end communicating with the water outlet through hole (5).

6. The bipolar plate according to claim 1, characterized in that: The hydrogen outlet end of the cathode flow field (11) is arranged in the width direction of the bipolar plate, the hydrogen outlet through hole (3) is arranged in alignment with the hydrogen outlet end of the cathode flow field (11) in the width direction of the bipolar plate, the water inlet end and the water outlet end of the anode flow field (21) are arranged in the length direction of the bipolar plate, and the water inlet through hole (4) and the water outlet through hole (5) are arranged in alignment with the water inlet end and the water outlet end of the anode flow field (21) in the length direction of the bipolar plate.

7. The bipolar plate according to claim 6, characterized in that: The bipolar plate is provided with a plurality of hydrogen outlet through holes (3), and the plurality of hydrogen outlet through holes (3) are arranged at intervals along the length direction of the bipolar plate; the cathode plate body (1) is provided with a plurality of hydrogen outlet slits (12), and the plurality of hydrogen outlet slits (12) are directly connected to the hydrogen outlet end of the cathode flow field (11) and are arranged at intervals along the length direction of the bipolar plate; and the plurality of hydrogen outlet slits (12) are respectively connected to the plurality of hydrogen outlet through holes (3); And / or, the bipolar plate is provided with a plurality of water inlet through holes (4) and a plurality of water outlet through holes (5), the plurality of water inlet through holes (4) are arranged at intervals along the width direction of the bipolar plate, the anode plate body (2) is provided with a plurality of water inlet slits (22), the plurality of water inlet slits (22) are directly connected to the water inlet end of the anode flow field (21) and are arranged at intervals along the width direction of the bipolar plate, the plurality of water inlet slits (22) are respectively connected to the plurality of water inlet through holes (4), the plurality of water outlet through holes (5) are arranged at intervals along the width direction of the bipolar plate, the anode plate body (2) is provided with a plurality of water outlet slits (23), the plurality of water outlet slits (23) are directly connected to the water outlet end of the anode flow field (21) and are arranged at intervals along the width direction of the bipolar plate, and the plurality of water outlet slits (23) are respectively connected to the plurality of water outlet through holes (5).

8. The bipolar plate according to claim 1, characterized in that: A first edge sealing groove (13) and a first through-hole sealing groove (14) are formed on the front surface of the cathode plate body (1); the first edge sealing groove (13) is arranged along the edge of the cathode plate body (1); the first through-hole sealing groove (14) is arranged around the hydrogen outlet through-hole (3), the water inlet through-hole (4) and the water outlet through-hole (5); and rubber sealing pads are provided in the first edge sealing groove (13) and the first through-hole sealing groove (14); And / or, a second edge sealing groove (24) and a second through hole sealing groove (25) are formed on the front side of the anode plate body (2), the second edge sealing groove (24) is arranged along the edge of the anode plate body (2), the second through hole sealing groove (25) is arranged around the hydrogen outlet through hole (3), the water inlet through hole (4) and the water outlet through hole (5), and rubber sealing pads are provided in the second edge sealing groove (24) and the second through hole sealing groove (25).

9. An electrolytic cell, characterized in that: Comprising a bipolar plate according to any one of claims 1 to 8.

10. A hydrogen production device, characterized in that: Comprising the electrolytic cell according to claim 9.

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