A stamped bipolar plate and electrolytic cell

Abstract

The present invention discloses a stamped bipolar plate and an electrolytic cell, which relate to the technical field of electrolytic cells. The stamped bipolar plate comprises two stamped single plates of identical structure. The middle portion of the front side of the single plate is concave to form a flow channel area. The front side of the single plate is also provided with a front sealing structure. The back side of the single plate is provided with a local welded sealing area. The two local welded sealing areas on the back side of the single plate are connected to form an integrated bipolar plate structure. One side of the bipolar plate structure is an anode reaction area, and the other side of the bipolar plate structure is a cathode reaction area. One end of the bipolar plate structure is provided with an anode flow channel inlet and a cathode flow channel inlet, and the other end of the bipolar plate structure is provided with an anode flow channel outlet and a cathode flow channel outlet. The bipolar plate structure of the present invention not only ensures a sealing effect, but also has a thinner thickness, lower material cost, fewer components, a shorter processing cycle, and is more suitable for mass production.

Description

Technical Field

[0001] The present invention relates to the technical field of electrolytic cells, and more specifically, to a stamped bipolar plate and an electrolytic cell. Background Art

[0002] The PEM electrolyzer is a key device for producing green hydrogen by electrolyzing water using renewable energy sources (such as wind power and photovoltaics). Its core components include the membrane electrode, bipolar plate, gas diffusion layer, and sealing structure.

[0003] The functions of the bipolar plate include distributing the reaction gas, collecting the current, providing mechanical support and heat dissipation. The bipolar plates currently on the market are usually processed by etching or stamping. The bipolar plates processed by etching need to be thicker, resulting in higher material costs and a longer processing cycle, which is not conducive to the mass production of later products. The bipolar plates processed by the existing stamping process are only the flow channel area in the middle of the stamping, while the surrounding structures such as the manifold port, the bridge area and the seal need to be matched with the plastic frame. This results in the bipolar plate not only having a complex structure and a thick overall thickness, but also a cumbersome assembly process. In addition, the dimensions of each component need to have a high matching accuracy to complete the assembly of the corresponding components. At the same time, due to the poor impact resistance of the plastic frame, it is not suitable for high-pressure working conditions, which leads to a high degree of processing difficulty. Summary of the Invention

[0004] The problem to be solved by the present invention is to provide a stamped bipolar plate, which has a simpler overall structure, does not require other additional accessories, has low processing costs, short processing cycles, and is more suitable for batch production.

[0005] In the first aspect, the present invention application provides a stamped bipolar plate, comprising: two stamped single plates with the same structure, the middle part of the front side of the single plate is concave to form a flow channel area, the front side of the single plate is also provided with a front sealing structure, and the back side of the single plate is provided with a local welding sealing area. The two local welding sealing areas on the back side of the single plates are connected to form an integrated bipolar plate structure, one side of the bipolar plate structure is an anode reaction area, and the other side of the bipolar plate structure is a cathode reaction area. One end of the bipolar plate structure is provided with an anode flow channel inlet and a cathode flow channel inlet, and the other end of the bipolar plate structure is provided with an anode flow channel outlet and a cathode flow channel outlet, and the bipolar plate structure is separated into an anode side reaction chamber and a cathode side reaction chamber through the cooperation of the front sealing structure and the local welding sealing area.

[0006] The flow channels of the flow channel area are arranged in a centrally symmetrical manner, and the flow channels at the outlet are shorter than the flow channels at the inlet.

[0007] The flow channel area includes an end channel area, a distribution area and a diffusion area. The flow channels in the channel area correspond to the flow channels in the distribution area one by one, and the flow channels in the diffusion area are more than the flow channels in the distribution area.

[0008] The front sealing structure includes a sealing groove, which is arranged at a peripheral position of the front of the single board, and a corresponding sealing glue line is arranged inside the sealing groove.

[0009] The single plate is made of metal material.

[0010] In a second aspect, the present invention provides an electrolytic cell comprising a stamped bipolar plate as described in any one of the first aspects above.

[0011] The electrolytic cell further comprises a membrane electrode, wherein the anode side of the membrane electrode is sealedly connected to the anode side of one of the bipolar plate structures, and the cathode side of the membrane electrode is sealedly connected to the cathode side of the other bipolar plate structure.

[0012] The beneficial effects of the stamped bipolar plate and electrolytic cell applied for in the present invention are: by connecting the backs of two stamped single plates with the same structure, an integrated bipolar plate structure is formed, and the bipolar plate structure is divided into an anode reaction chamber and a cathode reaction chamber through the single plate front sealing structure and the local welding sealing area. Compared with the bipolar plate structure of the prior art, since it requires additional plastic frames to form the manifold port, bridge area and other components of the bipolar plate, the integrated bipolar plate structure applied for in the present invention does not require additional components and can fully meet the functional characteristics of the bipolar plate. At the same time, the bipolar plate structure applied for in the present invention not only ensures the sealing effect, but also has a thinner thickness, lower material cost, fewer components, and a short processing cycle, and is more suitable for mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the overall structure of the bipolar plate structure applied in the present invention;

[0014] Figure 2 The front view (anode side) of the bipolar plate structure for the present invention;

[0015] Figure 3 This is a schematic structural diagram of the flow channel area of ​​the present invention;

[0016] Figure 4 An exploded view of the bipolar plate structure for the present invention;

[0017] Figure 5 A partial front view (anode side) of the bipolar plate structure for the present invention;

[0018] Figure 6 A partial view of the anode side inlet of the bipolar plate structure of the present invention;

[0019] Figure 7 A partial view of the anode side inlet of the bipolar plate structure for the present invention (from the other direction);

[0020] Figure 8 A partial view of the anode side outlet of the bipolar plate structure of the present invention;

[0021] Figure 9 Exploded view of the bipolar plate structure and membrane electrode for the present invention.

[0022] Description of reference numerals:

[0023] 1. Single plate; 2. Front sealing structure; 21. Sealing groove; 22. Sealing glue line; 23. First flange; 24. Second flange; 3. Flow channel area; 31. Diffusion area; 311. Third rib; 32. Inlet channel area; 321. First rib; 33. Outlet channel area; 34. Inlet distribution area; 341. Second rib; 35. Outlet distribution area; 4. Bipolar plate structure; 41. Anode flow channel inlet; 42. Cathode flow channel inlet; 43. Anode flow channel outlet; 44. Cathode flow channel outlet; 5. Local welding sealing area; 51. Flow channel opening sealing area; 52. Opening sealing area; 53. Bridge flow channel sealing area; 6. First bridge flow channel; 7. First opening; 8. Second opening; 9. Second bridge flow channel; 10. Third bridge flow channel; 11. Third opening; 12. Fourth opening; 13. Membrane electrode; 14. Blank area DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0025] Among them, the same parts are represented by the same figure marks. It should be noted that the words "front", "rear", "left", "right", "up" and "down" used in the following description refer to the directions in the drawings of the present application specification, and the words "bottom" and "top", "inside" and "outside" refer to directions toward or away from specific parts, respectively. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application specification, the meaning of "multiple" is two or more.

[0026] The present application will be further described below with reference to the accompanying drawings and embodiments.

[0027] Example 1: This example provides a stamped bipolar plate. Figure 1 The schematic diagram of the overall structure of the bipolar plate structure shown includes two stamped single plates 1 of identical structure. The middle portion of the front side of each plate 1 is concave to form a flow channel area 3. The front side of each plate 1 is also provided with a front sealing structure 2, and the back side of each plate 1 is provided with a local welded sealing area 5. After the back sides of the two single plates 1 are facing each other, they are welded together through the local welded sealing area 5 to form an integrated bipolar plate structure 4. If either side of the bipolar plate structure 4 is the anode reaction area, the flow channel area 3 on that side is the anode reaction area; if the other side of the bipolar plate structure 4 is the cathode reaction area, the flow channel area 3 on that side is the cathode reaction area.

[0028] It should be noted that if Figure 2 The front view (anode side) of the bipolar plate structure shown is considered to be the anode side front view of the bipolar plate structure 4 for the sake of convenience in subsequent description. The following description of this figure is based on this definition. An anode flow channel inlet 41 and a cathode flow channel inlet 42 are provided at one end of the bipolar plate structure 4, and an anode flow channel outlet 43 and a cathode flow channel outlet 44 are provided at the other end of the bipolar plate structure 4. The front sealing structure 2 and the local welded sealing area 5 cooperate to separate the bipolar plate structure 4 into an anode side reaction chamber and a cathode side reaction chamber. The anode side reaction chamber includes a connected anode flow channel inlet 41, an anode flow channel region, and an anode flow channel outlet 43. The cathode side reaction chamber includes a connected cathode flow channel inlet 42, a cathode flow channel region, and a cathode flow channel outlet 44.

[0029] In this embodiment, two identically stamped single plates 1 are placed face-to-face and welded together via a localized welded sealing region 5 to form an integrated bipolar plate structure 4. The front sealing structure 2, in conjunction with the localized welded sealing region 5, separates the bipolar plate structure 4 into an anode reaction chamber and a cathode reaction chamber, achieving the full functionality of the bipolar plate without requiring any additional components. Compared to prior art bipolar plates manufactured using a stamping process, which requires additional plastic frames to form the manifolds, bridges, and other components, not only results in a thicker bipolar plate but also requires consideration of the sealing between the various components, making the manufacturing process more complex. In the present invention, the two single plates 1 forming the bipolar plate structure 4 are identical in structure, allowing for a single stamping die to be used, effectively saving processing costs. Furthermore, no auxiliary components such as plastic frames are required, fully satisfying the functional characteristics of the bipolar plate. This results in a thinner bipolar plate with lower material costs, while also simplifying the overall structure and facilitating assembly, effectively reducing the processing cycle and making it more suitable for mass production.

[0030] In this embodiment, the two single plates 1 comprising the bipolar plate structure 4 are identical. During stacking and packaging, one single plate 1 is placed with its backside facing upward. The other single plate 1 is then placed in the same orientation as the first single plate 1, rotated 180 degrees relative to the first single plate 1 so that its backside faces the second single plate 1, and then welded together to form an integrated bipolar plate structure 4. Because both sides of the bipolar plate structure 4 have identical structures, in actual use, the side of either side of the bipolar plate structure 4 can be defined as the anode side, while the other side is the cathode side, as needed.

[0031] Specifically, the single plate 1 is made of a metal material, such as a pure titanium plate or a stainless steel plate, and can be formed by a stamping process. In the present invention, the single plate 1 uses a pure titanium substrate, which does not require surface coating, thereby saving material costs. The pure titanium substrate is selected to have a thickness of 0.3mm-0.5mm. The thickness of the integrated plate structure 4 formed by stamping and welding two single plates 1 is 2mm-3.5mm. This plate structure is thinner, has low processing costs, and is simple to process.

[0032] Optionally, the backs of the two single plates 1 constituting the bipolar plate structure 4 are welded together via a localized welding sealing area 5 to form an integrated plate structure 4. In the present invention, the backs of the two single plates 1 are connected by laser welding, which ensures the sealing of the connection between the two single plates 1 while simplifying the processing and shortening the processing cycle. The outer surface of the integrated plate structure 4 is then plated as a whole. The coating method can be PVD coating, electroplating, or brush plating. Platinum can be selected for the PVD coating, and the coating thickness is between 20nm and 50nm.

[0033] Specifically, the single plate 1 has two side surfaces that are relatively set, and the backs of the two single plates 1 are directly bonded and connected by welding. This not only ensures the sealing and connection strength of the two single plates 1, but also makes the plate structure lighter and thinner. Compared with the traditional plate structure, it has more auxiliary components, and the corresponding sealing requirements are higher, so the risk of failure is also greater. The two single plates 1 applied for in the present invention are arranged in coordination with the front sealing structure 2 and the local welding sealing area 5, which already have complete bipolar plate functions, simple structure, smaller contact resistance, and reduced number of components, thereby greatly simplifying the stacking assembly process.

[0034] Specifically, such as Figure 2The front view of the bipolar plate structure (anode side) is shown. The upper end of the bipolar plate structure 4 features an anode flow channel inlet 41 and a cathode flow channel inlet 42, while the lower end features an anode flow channel outlet 43 and a cathode flow channel outlet 44. The anode flow channel inlet 41 and anode flow channel outlet 43 are located at one diagonal position relative to the plate 1 on that side, while the cathode flow channel inlet 42 and cathode flow channel outlet 44 are located at the other diagonal position relative to the plate 1 on that side. In the present application, the anode flow channel inlet 41, cathode flow channel inlet 42, anode flow channel outlet 43, and cathode flow channel outlet 44 are all elongated, with rounded corners. On the anode side, the anode flow channel inlet 41 connects to the inlet of the flow channel section 3, and the anode flow channel outlet 43 connects to the outlet of the flow channel section 3. On the cathode side of the other side of the bipolar plate structure 4, the cathode flow channel inlet 42 connects to the inlet of the flow channel section on that side, and the cathode flow channel outlet 44 connects to the outlet of the flow channel section on that side.

[0035] Alternatively, as Figure 3 The figure shows the structure of the flow channel area. The flow channel arrangement of the flow channel area 3 is centrally symmetrical, and the flow channel at the outlet is shorter than the flow channel at the inlet. This ensures the uniformity of the distribution of reactants and products in the flow channel area 3, and at the same time can adjust the temperature to ensure the heat dissipation function.

[0036] Optionally, the flow channel area 3 includes a channel area, a distribution area and a diffusion area 31. The flow channels in the channel area correspond one-to-one to the flow channels in the distribution area. The flow channels in the diffusion area 31 are more than the flow channels in the distribution area. The diffusion area 31 serves as the core reaction area of ​​the anode side single plate and the cathode side single plate. By expanding the flow channels in the diffusion area 31 to make them more than the flow channels in the distribution area, effective fluid distribution and heat exchange in the reaction area are further ensured, thereby increasing the surface area of ​​the fluid heat exchange.

[0037] Specifically, the channel area includes an inlet channel area 32 and an outlet channel area 33. On the anode side of the bipolar plate structure 4, the inlet channel area 32 is connected to the anode flow channel inlet 41, and the outlet channel area 33 is connected to the anode flow channel outlet 43. On the cathode side of the bipolar plate structure 4, the inlet channel area 32 is connected to the cathode flow channel inlet 42, and the outlet channel area 33 is connected to the cathode flow channel outlet 44. The distribution area includes an inlet distribution area 34 and an outlet distribution area 35. The inlet distribution area 34 is located between the inlet channel area 32 and one end of the diffusion area 31, and the outlet distribution area 35 is located between the outlet channel area 33 and the other end of the diffusion area 31. The inlet channel area 32, the inlet distribution area 34, the diffusion area 31, the outlet distribution area 35, and the outlet channel area 33 are approximately symmetrically distributed around the center of the diffusion area 31. By configuring the flow channel area 3 as three different flow channel regions, local blockage and uneven distribution can be avoided.

[0038] Specifically, the inlet channel area 32 and the outlet channel area 33 each include a plurality of first ribs 321, which are vertically distributed along the length of the bipolar plate structure 4. The inlet distribution area 34 and the outlet distribution area 35 each include a plurality of second ribs 341, which are horizontally distributed along the width of the bipolar plate structure 4. The diffusion area 31 includes a plurality of third ribs 311, which are vertically distributed along the length of the integrated plate structure 4. The ratio of the number of third ribs 311 to the number of second ribs 341 is 1:1 to 3:1. The first ribs 321 and the second ribs 341 correspond one-to-one and are connected by arcuate ribs. The second ribs 341 and the corresponding third ribs 311 correspond one-to-one and are connected by arcuate ribs. In the present application, the number of third ribs 311 is three times the number of second ribs 341. During operation, the fluid entering the flow channel area is introduced vertically through the inlet channel area 32, distributed horizontally through the inlet distribution area 34, and then split in a triple flow channel manner through the diffusion area 31, thereby ensuring better distribution consistency of reactants and products, while also ensuring uniform pressure distribution and heat dissipation. While the flow channels in the channel area, distribution area, and diffusion area of ​​the present invention are all parallel channels, the flow channels in each zone of the present invention are not limited to the above channel structure and may also adopt wavy channels or point-shaped channels.

[0039] In this embodiment, the bipolar plate structure 4 adopts a double-sided water inlet method, that is, pure water is introduced into the anode side and the cathode side of the bipolar plate structure 4 at the same time. After the pure water on the anode side enters, most of the pure water does not participate in the electrolysis reaction. The pure water that does not participate in the reaction converges the oxygen on this side and then leads out. The pure water on the cathode side is only used to converge the hydrogen on the cathode side and lead out. The simultaneous water inlet on the anode side and the cathode side effectively ensures the heat dissipation effect, while making the reactants and products in the reaction zones on both sides more evenly distributed, and more conducive to leading out the corresponding gases produced on each side. With the development trend of electrolytic cells towards larger plates and larger flow rates, bipolar plates need to withstand larger water inlet volumes. However, if the water volume is too large, the piezoresistance generated will also increase accordingly. Generally speaking, if the water volume is doubled, the piezoresistance will increase by about four times. At the same time, a pump with a larger flow rate is required, which requires higher costs. The use of traditional bipolar plates is difficult to apply to such large plate electrolytic cells. The bipolar plate structure 4 of the present invention is suitable for this application. It adopts a double-sided water inlet method, which not only has a larger water inlet volume, but also can ensure the temperature uniformity of the flow channels on the anode side and the cathode side, and has a better heat dissipation effect.

[0040] Alternatively, as Figure 4In the exploded view of the bipolar plate structure 4 (the upper plate 1 is the anode side), the front sealing structure 2 includes sealing grooves 21 located circumferentially around the plate 1 and at the periphery of each flow channel opening. Corresponding sealing lines 22 are located within the sealing grooves 21. The sealing lines 22 provide a sealed connection between the flow channel area 3 and each flow channel opening of the integrated plate structure 4.

[0041] Specifically, the sealing groove 21 is arranged along the circumference of the single plate 1 and the periphery of each flow channel opening, and the sealing groove 21 is provided with a first flange 23 arranged at intervals. The first flange 23 is provided at the circumference of the single plate 1, and blank areas 14 are provided at both ends of the single plate 1. One blank area 14 is located between the anode flow channel inlet 41 and the cathode flow channel inlet 42, and the other blank area 14 is located between the anode flow channel outlet 43 and the cathode flow channel outlet 44. Second flanges 24 are provided at intervals along the edges of the anode flow channel inlet 41, the cathode flow channel inlet 42, the anode flow outlet 43, the cathode flow channel outlet 44, and the blank areas 14 on the single plate 1. The sealing line 22 includes a circumferential sealing line enclosing the first flange 23 and an internal sealing line enclosing the second flange 24. The circumferential and internal sealing lines form a double layer of sealing lines, enclosing the first and second flanges 23, 24. Short lines of sealing lines connect the two layers of sealing lines, corresponding to the gaps between the first and second flanges 23, 24. This double layer of sealing lines provides a more effective seal, effectively reducing the risk of sealing failure in the bipolar plate structure. Since the cathode and anode structures of the bipolar plate structure 4 are identical, the front sealing structure of the other side will not be described in detail.

[0042] As described above, since the sealing glue line 22 used on the front side of the bipolar plate structure 4 in this embodiment is a double-layer sealing glue line, it has a double sealing effect for the flow channel area 3 or the flow channel opening on each side, that is, if any layer of the double-layer sealing glue line is damaged, the other layer of glue line can still have a sealing effect, which effectively prevents hydrogen leakage, reduces safety hazards, ensures the performance of the bipolar plate structure, and avoids the risk of corrosion or damage to other components due to abnormalities such as gas leakage and liquid leakage.

[0043] Alternatively, as Figure 2In the main view of the bipolar plate structure 4 shown, a first bridge channel 6 is provided between the cathode channel inlet 42 and the channel area 3, a first opening 7 is also provided between the first bridge channel 6 and the channel area 3, and a second opening 8 is provided between the anode channel inlet 41 and the channel area 3. The first opening 7 and the second opening 8 are the same size and are symmetrically arranged. A second bridge channel 9 is provided between the anode channel outlet 44 and the channel area 3, and the second bridge channel 9 is arranged close to the channel area 3. A third bridge channel 10 is also provided between the anode channel outlet 43 and the channel area 3, and the third bridge channel 10 is close to the anode channel outlet 43 and is connected to it. A third opening 11 and a fourth opening 12 are also provided between the anode channel outlet 43 and the reaction area 3, and the third opening 11 corresponds to the upper end opening of the second bridge channel 9, and the fourth opening 12 corresponds to the lower end opening of the second bridge channel 9. The above bridge channels and openings are all designed on each single board 1.

[0044] Specifically, such as Figure 5 The figure shows a partial front view (anode side) of the bipolar plate structure 4. To more clearly illustrate the localized welded sealing area 5 on the back side, this backside sealing mechanism 5 is shown on the front side. The localized welded sealing area 5 includes an end flow channel sealing area 51, an opening sealing area 52, and a bridge flow channel sealing area 53. The end flow channel sealing area 51 is located circumferentially around each flow channel opening of the bipolar plate structure 4. The anode flow channel inlet 41, cathode flow channel inlet 42, anode flow channel outlet 43, and cathode flow channel outlet 44 of the bipolar plate structure 4 are welded and sealed through the end flow channel sealing area 51. The opening sealing area 52 is located circumferentially around the first and second openings 7, 8. The opening sealing area 52 is welded and sealed through the first and second openings 7, 8. The bridge channel sealing area 53 includes two identical sealing areas, one sealing area is arranged on the circumference of the second bridge channel 9, which is used to weld and seal the circumference of the second bridge channel 9, and the other sealing area is arranged on the outer circumference of the third mouth 11 and the fourth mouth 12, which is used to weld and seal the outer circumference of the third mouth 11 and the fourth mouth 12.

[0045] In this embodiment, after the back surfaces of the two plates 1 are aligned, the sealing areas of the localized welding seals are welded to the corresponding sealing areas. The four flow openings of the bipolar plate structure 4 are welded and sealed at the end flow opening sealing area 51. The opening sealing area 52 welds and seals the circumference of the first and second openings 7 and 8, respectively. The bridge flow channel sealing area 53 welds and seals the circumference of the second bridge flow channel 9 and the outer peripheries of the third and fourth openings 11 and 12. The front sealing structure 2 seals the flow openings and reaction areas on the front surface of the plates 1, thereby separating the anode-side reaction chamber from the cathode-side reaction chamber.

[0046] Specifically, since the single plate 1 is arranged back to back with another single plate 1, one single plate 1 is rotated 180 degrees relative to the other single plate. Therefore, when the corresponding sealing areas are welded, the first mouth 7 of the anode side single plate 1 corresponds to the second mouth 8 of the cathode side single plate 1, and the bridge flow channel sealing area 53 on the periphery of the third mouth 11 and the fourth mouth 12 of the anode side single plate 1 corresponds to the circumferential bridge flow channel sealing area of ​​the second bridge flow channel 9 of the cathode side single plate 1.

[0047] The following describes in detail the direction of fluid flow on the anode side of the bipolar plate structure 4. Figure 6 、 7 The figure shows a schematic diagram of the partial structure of the anode side inlet of the bipolar plate structure 4, which illustrates the flow direction of the fluid at the inlet. Specifically, the fluid enters from the anode flow channel inlet 41 and then flows downward. After being guided by the first bridge flow channel 6 on the cathode side, it flows upward into the second port 8 (the anode side flow channel inlet 41, the first bridge flow channel 6 on the cathode side single plate 1, the second port 8 of the anode side single plate 1 and the corresponding first port 7 of the cathode side single plate 1 constitute a fluid channel), and enters the reaction zone 3 through the second port 8. The fluid flowing out of the reaction zone 3 after the reaction is as shown in the bipolar plate shown in FIG8. A schematic diagram of the partial structure of the anode-side outlet of structure 4 shows the fluid flow direction at this outlet. The fluid at the outlet of reaction zone 3 flows in through the third opening 11, then flows downward, entering the interior of the second bridge channel 9 of the cathode-side plate 1 (where the bridge channel seal 53 forms a flow channel connecting the interior of the second bridge channel 9 of the cathode-side plate 1 with the third opening 11 and fourth opening 12 of the anode-side plate 1). The fluid in the second bridge channel 9 then flows upward, out through the fourth opening 12, and then out through the third bridge channel 10 and the anode-side channel outlet 43. The fluid flow direction on the cathode side of bipolar plate structure 4 is similar to that on the anode side and will not be further described here.

[0048] In Example 2, the present invention provides an electrolytic cell comprising the above bipolar plate structure. The electrolytic cell of the present invention has all the technical features and effects of the above bipolar plate structure, which will not be described in detail here.

[0049] Specifically, it also includes a membrane electrode 13, the anode side of the membrane electrode 13 being sealed to the anode side of one bipolar plate structure 4, and the cathode side of the membrane electrode 13 being sealed to the cathode side of another bipolar plate structure 4. In actual use, the electrolyzer mainly includes multiple membrane electrodes 13 and multiple bipolar plate structures 4, which are alternately stacked and assembled.

[0050] The above description is merely a preferred embodiment of the present invention, and the present invention is not limited to the above embodiments. It is understood that other improvements and variations directly derived or imagined by those skilled in the art without departing from the spirit and concept of the present invention should be considered to be included in the scope of protection of the present invention.

[0051] As described above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be construed as limiting the present invention itself. Various changes may be made to the form and details without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims

1. A stamped bipolar plate, characterized in that: include: Two stamped single plates with identical structures, wherein the middle portion of the front side of the single plate is concave to form a flow channel area, the front side of the single plate is further provided with a front sealing structure, and the back side of the single plate is provided with a local welded sealing area, and an integrated bipolar plate structure is formed by connecting the two local welded sealing areas on the back side of the single plates, one side of the bipolar plate structure is an anode reaction area, and the other side of the bipolar plate structure is a cathode reaction area, one end of the bipolar plate structure is provided with an anode flow channel inlet and a cathode flow channel inlet, and the other end of the bipolar plate structure is provided with an anode flow channel outlet and a cathode flow channel outlet, and the bipolar plate structure is separated into an anode side reaction chamber and a cathode side reaction chamber by the cooperation of the front sealing structure and the local welded sealing area; On the front side of the single plate, a first bridge flow channel is provided between the cathode flow channel inlet and the flow channel area, a second bridge flow channel is provided between the cathode flow channel outlet and the flow channel area, a third bridge flow channel is provided between the anode flow channel outlet and the flow channel area, a first opening is further provided between the first bridge flow channel and the flow channel area, a second opening is provided between the anode flow channel inlet and the flow channel area, and a third opening and a fourth opening are further provided between the anode flow channel outlet and the flow channel area. The local welding sealing area includes the flow channel sealing area at the end, the opening sealing area, and the bridge flow channel sealing area. The four flow channel openings of the bipolar plate structure are welded and sealed through the flow channel sealing area at the end. The opening sealing area welds and seals the circumference of the first and second openings respectively. The bridge flow channel sealing area welds and seals the circumference of the second bridge flow channel and the outer periphery of the third and fourth openings.

2. A stamped bipolar plate according to claim 1, characterized in that: The flow channels of the flow channel area are arranged in a centrally symmetrical manner, and the flow channels at the outlet are shorter than the flow channels at the inlet.

3. The stamped bipolar plate according to claim 2, characterized in that: The flow channel area includes an end channel area, a distribution area and a diffusion area. The flow channels in the channel area correspond to the flow channels in the distribution area one by one, and the flow channels in the diffusion area are more than the flow channels in the distribution area.

4. The stamped bipolar plate according to claim 3, characterized in that: The front sealing structure includes a sealing groove, which is arranged at a peripheral position of the front of the single board, and a corresponding sealing glue line is arranged inside the sealing groove.

5. The stamped bipolar plate according to claim 1, characterized in that: The single plate is made of metal material.

6. An electrolytic cell, characterized in that: A stamped bipolar plate comprising any one of claims 1 to 5.

7. An electrolytic cell according to claim 6, characterized in that: The electrolytic cell further comprises a membrane electrode, wherein the anode side of the membrane electrode is sealedly connected to the anode side of one of the bipolar plate structures, and the cathode side of the membrane electrode is sealedly connected to the cathode side of the other bipolar plate structure.

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