Bipolar plate and electrolysis device

Abstract

The embodiment of the utility model provides a bipolar plate and an electrolysis device, and belongs to the technical field of electrolytic baths, the bipolar plate comprises a plate body, the plate body is provided with a cathode side and an anode side which are opposite to each other, and the cathode side and the anode side are respectively provided with flow field grooves allowing electrolyte to circulate; wherein each flow field groove is internally provided with a spirally coiled cooling pipeline, the cooling pipeline is provided with a liquid inlet end and a liquid outlet end, and the liquid inlet end and the liquid outlet end extend to the edge of the side end of the plate body and penetrate out of the plate body to be communicated with the outside. According to the bipolar plate and the electrolysis device provided by the embodiment of the invention, the heat dissipation effect of the small electrolysis chamber can be enhanced.

Description

Technical Field

[0001] This application relates to electrolytic cell technology, and more particularly to a bipolar plate and an electrolysis apparatus. Background Technology

[0002] Existing water electrolysis hydrogen production technology is mainly based on the principle of an electrolyzer. An electrolyzer consists of multiple electrolysis chambers, each separated by bipolar plates to form a cathode and an anode. When an external power source applies voltage, current flows through the electrolyte solution. Oxygen is generated at the anode through an oxidation reaction, while hydrogen is generated at the cathode through a reduction reaction. The bipolar plates prevent the generated hydrogen and oxygen from mixing, while also efficiently conducting current and distributing it evenly to each electrolysis chamber.

[0003] Electrolysis chambers generate heat during the reaction process, requiring timely cooling to prevent high temperatures from affecting electrolysis efficiency. In related technologies, coolers are typically installed on the outer side of the electrolysis chamber for heat exchange and cooling. However, due to the large number of electrolysis chambers, external coolers struggle to accurately control the temperature within each chamber, leading to uneven heat distribution and impacting electrolysis efficiency. Utility Model Content

[0004] This application provides a bipolar plate and an electrolysis device to solve the problem of uneven heat distribution in the electrolysis chamber of electrolysis devices in related technologies.

[0005] On the one hand, this application provides a bipolar plate, including:

[0006] The plate body has a cathode side and an anode side, and the cathode side and the anode side are respectively constructed with flow field grooves for the flow of electrolyte;

[0007] Each of the flow field grooves is provided with a spirally coiled cooling pipe. The cooling pipe has an inlet end and an outlet end. The inlet end and the outlet end extend to the edge of the plate body and pass through the plate body to communicate with the outside.

[0008] In some possible implementations, the cooling pipes corresponding to the cathode side have a first projection on the plate body, and the cooling pipes corresponding to the anode side have a second projection on the plate body, with the first projection and the second projection arranged alternately.

[0009] In some possible implementations, pole frames are provided on both the cathode side and the anode side, and the pole frames and the corresponding plate body together form the flow field groove; the height of the pole frames is not less than the diameter of the cooling pipe.

[0010] In some possible implementations, the pole frame is flush with the side of the cooling pipe opposite to the plate body.

[0011] In some possible implementations, the electrode frame is provided with an electrolyte inlet communicating with the flow field groove, and the electrode frame is provided with a first fluid outlet and a second fluid outlet communicating with the flow field groove. The first fluid outlet is located on the cathode side and is used to output an electrolyte-hydrogen mixture, and the second fluid outlet is located on the anode side and is used to output an electrolyte-oxygen mixture.

[0012] In some possible implementations, the cooling pipeline includes a first fluid branch pipe, a transition connecting pipe, and a second fluid branch pipe connected in sequence. One end of the first fluid branch pipe forms the liquid inlet, and the end of the second fluid branch pipe opposite to the transition connecting pipe forms the liquid outlet. Both the first fluid branch pipe and the second fluid branch pipe are arranged in a spiral around the transition connecting pipe and at intervals.

[0013] In some possible implementations, the first fluid branch pipe and the second fluid branch pipe form a flow channel for electrolyte circulation, and at least one flow guide tube is provided on the transition connecting pipe for connecting the flow channels on both sides of the transition connecting pipe.

[0014] In some possible implementations, the first fluid branch and the second fluid branch are arranged in a centrally symmetrical manner about the center of the plate body.

[0015] In some possible implementations, the cooling pipes have at least two spaced apart along the radial direction of the plate body, and the at least two cooling pipes are arranged centrally symmetrically about the center of the plate body.

[0016] On the other hand, embodiments of this application also provide an electrolysis apparatus, including a cell body and a bipolar plate as described in any of the preceding claims disposed on the cell body.

[0017] The bipolar plate and electrolysis device provided in this application embodiment have a cooling pipe located inside the flow field groove in the bipolar plate, which is combined with the flow path of the electrolyte. The cooling pipe directly exchanges and transfers the heat generated by the electrolysis reaction, avoiding the lag of traditional external coolers and enhancing the heat dissipation effect. Each flow field groove is equipped with a spirally wound cooling pipe, and each adjacent electrolysis chamber has a cooling pipe for heat exchange, realizing independent and unitized temperature control of the electrolysis chamber, avoiding the problem of excessive local heat in the electrolysis chamber, ensuring uniform heat distribution in each electrolysis chamber, and helping to improve electrolysis efficiency. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0019] Figure 1This is a front view of the bipolar plate in an embodiment of this application;

[0020] Figure 2 for Figure 1 Partial cross-sectional view of the bipolar plate;

[0021] Figure 3 for Figure 1 Enlarged view of the middle section structure;

[0022] Figure 4 This is a front view of the bipolar plate in another embodiment of this application.

[0023] Explanation of reference numerals in the attached figures

[0024] 100. Plate body; 101. Cathode side; 102. Anode side; 103. Flow field groove; 104. Electrode frame; 105. Electrolyte inlet; 106. First fluid outlet; 107. Second fluid outlet; 108. First cooling pipe; 109. Second cooling pipe;

[0025] 200 Cooling pipe; 210 Liquid inlet; 220 Liquid outlet; 201 First fluid branch pipe; 202 Second fluid branch pipe; 203 Transition connection pipe; 2011 Flow channel; 2031 Flow guide tube.

[0026] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0028] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection through an intermediate medium, or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0029] In the description of this application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0030] The terms "first," "second," "third," "fourth," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in a sequence other than those illustrated or described herein.

[0031] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such that a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or apparatus.

[0032] As mentioned in the background section, in alkaline electrolysis hydrogen production equipment, the heat dissipation path of the electrolysis cells in the electrolyzer is limited, and the outer cooler cannot evenly cover all the electrolysis cells. In particular, the heat dissipation efficiency of the electrolysis cells in the central area is low. The local current density of the bipolar plates that make up the electrolysis cells is too high, which easily leads to heat concentration and aggravates temperature differences, seriously affecting the electrolysis efficiency.

[0033] Based on the above description, one or more embodiments of this application provide a bipolar plate and an electrolysis device. The following describes the solutions of the embodiments of this application in conjunction with the accompanying drawings.

[0034] like Figure 1As shown, the bipolar plate provided in this application embodiment includes a plate body 100, which has a cathode side 101 and an anode side 102. The cathode side 101 and the anode side 102 are respectively constructed with flow field grooves 103 that allow electrolyte to flow. Each flow field groove 103 is provided with a spirally wound cooling pipe 200. The cooling pipe 200 has a liquid inlet end 210 and a liquid outlet end 220. The liquid inlet end 210 and the liquid outlet end 220 extend to the side edge of the plate body 100 and pass through the plate body 100 to communicate with the outside.

[0035] As can be seen from the above description, the bipolar plate provided in this application embodiment has a cooling pipe 200 located inside the flow field groove 103, which is combined with the flow path of the electrolyte. The cooling pipe 200 directly exchanges and transfers the heat generated by the electrolysis reaction, avoiding the lag of traditional external coolers and enhancing the heat dissipation effect. Each flow field groove 103 is equipped with a spirally wound cooling pipe 200, and each adjacent electrolysis chamber has a cooling pipe 200 for heat exchange, realizing the independent and unitized temperature control of the electrolysis chamber, avoiding the problem of excessive local heat in the electrolysis chamber, ensuring uniform heat distribution in each electrolysis chamber, and helping to improve electrolysis efficiency.

[0036] In addition, cooling pipes 200 are respectively provided in the flow field grooves 103 on the cathode side 101 and the anode side 102. The cooling pipes 200 corresponding to the anode side 102 and the cathode side 101 can be connected in parallel or in series. When the cooling pipes 200 corresponding to the anode side 102 and the cathode side 101 are independently connected in parallel, the independently arranged cooling pipes can adjust the flow rate or temperature according to the difference in heat on both sides. For example, the coolant flow rate or flow velocity on the anode side 102 is higher to cope with the heat brought by the higher oxygen evolution overpotential, thereby ensuring that the heat on both sides of the bipolar plate is evenly distributed and improving the electrolysis efficiency.

[0037] It should be noted that, in the embodiments of this application, bipolar plates are generally used in alkaline electrolysis hydrogen production process equipment. The bipolar plates connect adjacent electrolysis chambers, and the cathode and anode are respectively attached to opposite sides of the bipolar plates. The bipolar plates physically isolate the adjacent cathode side 101 (i.e., the hydrogen production side) and anode side 102 (i.e., the oxygen production side) to prevent hydrogen and oxygen from mixing and to ensure that the electrolyte flows in their respective electrolysis chambers. One side of the bipolar plate is the cathode side 101, and the opposite side is the anode side 102. Here, in addition to the structure mentioned in the embodiments of this application, the other parts of the bipolar plate can be set with reference to the bipolar plates in the electrolytic cells in related technologies.

[0038] The bipolar plate in this embodiment can be used not only for hydrogen production in alkaline electrolyzers, but also in other related equipment that requires cooling of the electrolyte, such as fuel cell electrolysis equipment.

[0039] like Figure 2 As shown in the embodiment of this application, the cooling pipe 200 corresponding to the cathode side 101 has a first projection on the plate body 100, and the cooling pipe 200 corresponding to the anode side 102 has a second projection on the plate body 100. The first projection and the second projection are arranged alternately.

[0040] In the above embodiment, taking the axial direction of the bipolar plate as the reference direction, the cooling pipe 200 corresponding to the cathode side 101 is... Figure 2 The first cooling pipe 108 in the middle, the cooling pipe 200 corresponding to the anode side 102 is Figure 2 The projections of the first cooling pipe 108 on the plate body 100 and the projections of the second cooling pipe 109 on the plate body 100 are arranged alternately, that is, the cooling pipes 200 on the cathode side 101 and the cooling pipes 200 on the anode side 102 are not overlapped.

[0041] Generally, bipolar plates are made of metallic materials, such as nickel-plated stainless steel or titanium alloys. Metallic materials have a certain thermal conductivity. Therefore, through the thermal conductivity of the bipolar plate itself, the cooling pipes 200 on the cathode side 101 can compensate for the area on the anode side 102 that is not covered by the cooling pipes 200. The cooling pipes 200 on the cathode side 101 and the anode side 102 are arranged alternately to minimize the heat blind zone in the same axial direction, so as to achieve complementary heat dissipation and thus ensure that the electrolyte on both the cathode side 101 and the anode side 102 of the bipolar plate has a good heat dissipation effect.

[0042] like Figure 1 As shown, in some embodiments, pole frames 104 are provided on both the cathode side 101 and the anode side 102, and the pole frames 104 and the corresponding plate body 100 together form a flow field groove 103; the height of the pole frames 104 is not less than the diameter of the cooling pipe 200.

[0043] In the above embodiments, the electrode frame 104 is a rigid support for the bipolar plate to dock with other bipolar plates. The bipolar plates dock with other bipolar plates through the electrode frame to form an electrolytic chamber for sealing the electrolyte. On the other hand, the electrode frame 104 defines the boundary of the flow field groove 103. The protruding height of the electrode frame 104 is not less than the diameter of the cooling pipe 200, which can withstand the sealing pressure when stacked and assembled to form an electrolytic chamber, and avoid the cooling pipe 200 being directly contacted and deformed by pressure. The diameter of the cooling pipe 200 is less than the depth of the flow field groove 103, which can reserve space for the flow of electrolyte and enhance the flow effect of electrolyte.

[0044] Furthermore, the electrode frame 104 and the cooling pipe 200 are flush with the side of the plate body 100 away from the cooling pipe 200. This flush design of the electrode frame 104 and cooling pipe 200 further reduces the overall thickness of the electrolysis chamber. Simultaneously, when the electrode frames 104 on the two double electrode plates are joined, the cooling pipes 200 on the two double electrode plates restrict the flow path of the electrolyte within the flow field groove 103, thereby causing the electrolyte to flow along the restricted path of the cooling pipe 200, extending the flow time of the electrolyte within the flow field groove 103, and improving the electrolysis effect. Here, the relative height of the electrode frame 104 and the cooling pipe 200 can be flexibly set according to the actual scenario. For example, when it is necessary to increase the fluidity of the electrolyte for rapid circulation, the protrusion height of the electrode frame 104 is higher than the diameter of the cooling pipe 200; when it is necessary to extend the residence time of the electrolyte on the electrode surface to enhance the electrolysis effect, the protrusion height of the electrode frame 104 is flush with the cooling pipe 200 to restrict the flow of the electrolyte.

[0045] In this embodiment, the electrode frame 104 is provided with an electrolyte inlet 105 communicating with the flow field groove 103. The electrode frame 104 is provided with a first fluid outlet 106 and a second fluid outlet 107 communicating with the flow field groove 103. The first fluid outlet 106 is located on the cathode side 101 and is used to output an electrolyte hydrogen mixture. The second fluid outlet 107 is located on the anode side 102 and is used to output an electrolyte oxygen mixture.

[0046] In this example, the electrolyte is an alkaline solution in an alkaline electrolytic cell, such as potassium hydroxide solution or sodium hydroxide solution. The cathode side 101 of the bipolar plate is arranged opposite to the anode side 102 of the adjacent bipolar plate, and a diaphragm is provided between the two bipolar plates. Therefore, the first fluid outlet 106 located on the upper electrode frame 104 of the cathode side 101 of the bipolar plate is mainly used to output a gas-liquid mixture of electrolyte and hydrogen, and the second fluid outlet 107 located on the upper electrode frame 104 of the anode side 102 of the bipolar plate is used to output a gas-liquid mixture of electrolyte and anode.

[0047] Of course, an electrolyte inlet 105 for alkaline solution to flow into should also be provided on the bipolar plate. Here, the electrolysis chamber enclosed by the bipolar plate is a closed cavity, and the cooling pipe 200 is connected to the external liquid supply equipment through the liquid inlet end 210 and the liquid outlet end 220 to form a circulation pipe.

[0048] The cooling pipe 200 can be made of high-temperature and corrosion-resistant materials, such as metal pipes. The cooling pipe 200 can be directly spot-welded to the bipolar plate or fixed to the bipolar plate by pipe clamps. This application embodiment does not make an absolute limitation on this.

[0049] like Figure 1 and Figure 3In this embodiment of the application, the cooling pipe 200 includes a first fluid branch pipe 201, a transition connecting pipe 203 and a second fluid branch pipe 202 connected in sequence. One end of the first fluid branch pipe 201 forms an inlet end 210, and the end of the second fluid branch pipe 202 away from the transition connecting pipe 203 forms an outlet end 220. The first fluid branch pipe 201 and the second fluid branch pipe 202 are both coiled around the transition connecting pipe 203 and are arranged at intervals.

[0050] Specifically, with Figure 1 Taking the direction shown as an example, the first fluid branch pipe 201, the second fluid branch pipe 202 and the transition connecting pipe 203 together form a complete heat exchange fluid path. Cooling fluid is input to the first fluid branch pipe 201 through the liquid inlet 210. The cooling fluid first flows counterclockwise to the transition connecting pipe 203, and is then guided by the transition connecting pipe 203 to the second fluid branch pipe 202. In the second fluid branch pipe 202, it flows clockwise to the liquid outlet 220 and flows out of the electrolysis chamber.

[0051] Since both the first fluid branch pipe 201 and the second fluid branch pipe 202 are spirally coiled and arranged adjacent to each other, the cooling fluid flows in opposite directions in the adjacent fluid branch pipes. This arrangement can increase the average temperature difference between the cooling fluids and improve the heat exchange efficiency. The opposite winding directions of the first fluid branch pipe 201 and the second fluid branch pipe 202 enable the cooling pipe 200 to uniformly cover most of the heat source area of ​​the flow field groove 103, avoiding the heat dissipation blind spots present in traditional unidirectional spiral cooling, and ensuring that the overall temperature of the electrolyte is uniform and stable.

[0052] It should be noted that the cooling pipe 200 in this embodiment adopts a circular cross-section pipe or an elliptical cross-section pipe, preferably a circular cross-section pipe. A circular cross-section pipe has lower flow resistance and a more uniform flow field. The bends in the cooling pipe 200 and the connections between the inlet end 210 and the outlet end 220 are made with a gradual arc transition to avoid direct bending. The transition connection pipe 203 is... Figure 3 The “S”-shaped pipe in the example is connected to the outlet of the first fluid branch pipe 201 and the inlet of the second fluid branch pipe 202 respectively. This arrangement facilitates the guidance of cooling fluid and makes the transition of cooling fluid between the first fluid branch pipe 201 and the second fluid branch pipe 202 smoother.

[0053] like Figure 3 As shown, further, in the bipolar plate of this application embodiment, the first fluid branch pipe 201 and the second fluid branch pipe 202 form an electrolyte flow channel 2011, and at least one guide tube 2031 is provided on the transition connecting pipe 203. The guide tube 2031 is used to connect the flow channels 2011 on both sides of the transition connecting pipe 203.

[0054] The aforementioned guide tube 2031 is a cylindrical tube that penetrates and is fixed within the transition connecting pipe 203. The diameter of the guide tube 2031 is smaller than the diameter of the transition connecting pipe 203, and it is used to connect the flow channels 2011 on both sides of the transition connecting pipe 203. For example, Figure 1 The cathode side 101 of the bipolar plate is shown in the middle. Electrolyte enters the flow field groove 103 through the electrolyte inlet 105. The cooling pipe 200 in the flow field groove 103 restricts the flow path of the electrolyte. The electrolyte flows counterclockwise along the flow channel 2011 formed by the first fluid branch pipe 201 and the second fluid branch pipe 202. At the transition connecting pipe 203, it enters the adjacent flow channel 2011 through the guide pipe and flows out of the flow field groove 103 clockwise. The gas-liquid mixture of electrolyte and hydrogen flows out from the first fluid outlet 106. The anode side 102 of the bipolar plate can be described with reference to the electrolyte flow description of the cathode side 101.

[0055] It should be noted that in actual operation, the electrolyte does not flow completely along the flow channel 2011 in the flow field groove 103. Some electrolyte will overflow the cooling pipe 200 and flow directly out from the first fluid outlet 106. Since the cooling pipe 200 is in direct contact with the electrolyte, the electrolyte that does not enter the flow channel 2011 can also be heat-exchanged by the cooling pipe 200 to achieve the cooling and heat dissipation effect. Generally speaking, when the protrusion height of the electrode frame 104 is similar to the diameter of the cooling pipe 200, more electrolyte is restricted from entering the flow channel 2011 by the cooling pipe 200. When the protrusion height of the electrode frame 104 is higher than the diameter of the cooling pipe 200, less electrolyte is restricted from entering the flow channel 2011 by the cooling pipe 200.

[0056] like Figure 1 and Figure 4 As shown, in this embodiment, the first fluid branch pipe 201 and the second fluid branch pipe 202 are arranged symmetrically about the center of the plate body 100. The symmetrical arrangement of the first fluid branch pipe 201 and the second fluid branch pipe 202 makes the flow path of the electrolyte and cooling fluid smoother, the heat exchange between the electrolyte and cooling fluid more complete, and the heat in the electrolyte can be evenly transferred to the cooling fluid, thereby effectively reducing the temperature of the electrolysis chamber and minimizing the problems of decreased electrolysis efficiency and increased voltage caused by excessively high temperatures.

[0057] In some embodiments, such as Figure 4 As shown, the cooling pipes 200 have at least two spaced apart along the radial direction of the plate body 100, and the at least two cooling pipes 200 are arranged in a centrally symmetrical manner about the center of the plate body 100.

[0058] The aforementioned cooling pipes 200 all include a first fluid branch pipe 201 and a second fluid branch pipe 202 connected together, for example, Figure 4In the middle, two cooling pipes 200 are provided on the bipolar plate on the same side. Each cooling pipe 200 is connected to the external liquid supply equipment through an inlet end 210 and an outlet end 220. Setting at least two cooling pipes 200 can fully absorb the heat in the electrolysis chamber and avoid local overheating caused by the limited coverage of a single cooling pipe 200.

[0059] Furthermore, the two cooling pipes 200 are arranged symmetrically about the center of the plate body 100. This symmetrical design allows the coolant to absorb and dissipate heat symmetrically as it flows through the electrolysis chamber, ensuring a more uniform heat distribution within the chamber. The symmetrical arrangement also makes the flow path and resistance of the coolant more balanced as it flows through the different cooling pipes 200, reducing uneven coolant flow caused by differences in flow resistance and further improving the uniformity of the cooling effect.

[0060] Of course, depending on the size of the bipolar plate, the cooling pipes 200 can be set to other quantities, which will not be elaborated in this embodiment.

[0061] This application also provides an electrolysis apparatus, including a tank body and a bipolar plate provided on the tank body as described in any of the above embodiments.

[0062] Since the electrolysis apparatus in this application includes the bipolar plate as in any of the above embodiments, it has all the advantages of a bipolar plate.

[0063] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the utility models disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0064] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A bipolar plate, characterized in that, include: The plate body (100) has a cathode side (101) and an anode side (102) opposite to each other, and the cathode side (101) and the anode side (102) are respectively constructed with flow field grooves (103) for the flow of electrolyte. Each of the flow field grooves (103) is provided with a spirally coiled cooling pipe (200), the cooling pipe (200) having a liquid inlet end (210) and a liquid outlet end (220), the liquid inlet end (210) and the liquid outlet end (220) extending to the edge of the plate body (100) and passing through the plate body (100) to communicate with the outside.

2. The bipolar plate according to claim 1, characterized in that, The cooling pipe (200) corresponding to the cathode side (101) has a first projection on the plate body (100), and the cooling pipe (200) corresponding to the anode side (102) has a second projection on the plate body (100). The first projection and the second projection are arranged alternately.

3. The bipolar plate according to claim 1, characterized in that, Both the cathode side (101) and the anode side (102) are provided with pole frames (104), and the pole frames (104) and the corresponding plate body (100) together form the flow field groove (103); the height of the pole frames (104) is not less than the diameter of the cooling pipe (200).

4. The bipolar plate according to claim 3, characterized in that, The pole frame (104) is flush with the side of the cooling pipe (200) away from the plate body (100).

5. The bipolar plate according to claim 3, characterized in that, The electrode frame (104) is provided with an electrolyte inlet (105) communicating with the flow field groove (103). The electrode frame (104) is provided with a first fluid outlet (106) and a second fluid outlet (107) communicating with the flow field groove (103). The first fluid outlet (106) is located on the cathode side (101) and is used to output an electrolyte hydrogen mixture. The second fluid outlet (107) is located on the anode side (102) and is used to output an electrolyte oxygen mixture.

6. The bipolar plate according to claim 1, characterized in that, The cooling pipeline (200) includes a first fluid branch pipe (201), a transition connecting pipe (203), and a second fluid branch pipe (202) connected in sequence. One end of the first fluid branch pipe (201) forms the liquid inlet (210), and the end of the second fluid branch pipe (202) away from the transition connecting pipe (203) forms the liquid outlet (220). The first fluid branch pipe (201) and the second fluid branch pipe (202) are both coiled around the transition connecting pipe (203) and spaced apart.

7. The bipolar plate according to claim 6, characterized in that, The first fluid branch pipe (201) and the second fluid branch pipe (202) form an electrolyte flow channel (2011). At least one guide tube (2031) is provided on the transition connecting pipe (203). The guide tube (2031) is used to connect the flow channels (2011) on both sides of the transition connecting pipe (203).

8. The bipolar plate according to claim 6, characterized in that, The first fluid branch pipe (201) and the second fluid branch pipe (202) are arranged in a centrally symmetrical manner about the center of the plate body (100).

9. The bipolar plate according to any one of claims 1 to 8, characterized in that, The cooling pipes (200) have at least two spaced apart along the radial direction of the plate body (100), and the at least two cooling pipes (200) are arranged in a centrally symmetrical manner about the center of the plate body (100).

10. An electrolysis apparatus, characterized in that, It includes a tank body and a bipolar plate disposed on the tank body as described in any one of claims 1 to 9.

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