WO2024164228A1 - Bipolar plate, electrolysis cell, fuel cell, and device for hydrogen production by water electrolysis - Google Patents

Abstract

The present application relates to a bipolar plate, an electrolysis cell, a fuel cell, and a device for hydrogen production by water electrolysis. The bipolar plate comprises: a substrate; an anode side flow channel comprising an anode main flow channel and an anode reaction zone flow channel which are connected to each other, the anode main flow channel passing through the substrate, and the anode reaction zone flow channel being formed on a first side of the substrate; and a cathode side flow channel comprising a cathode main flow channel and a cathode reaction zone flow channel which are connected to each other, the cathode main flow channel passing through the substrate, and the cathode reaction zone flow channel being formed on a second side of the substrate. The bipolar plate can overcome the defects that the bipolar plate in the prior art is complex in manufacturing process, large in quantity, high in production cost and high in fluid pressure which needs to be borne on a single side, and has the advantages of simple manufacturing process, a small quantity of plates for expressing flow channel features, low production cost and better pressure bearing capacity.

Description

Bipolar plate, electrolysis chamber, fuel cell and water electrolysis hydrogen production device Technical Field

The present application relates to the technical field of fuel cells, and in particular to a bipolar plate, an electrolysis chamber, a fuel cell and a water electrolysis hydrogen production device.

Background Art

Bipolar plates are one of the important components of fuel cells and water electrolysis hydrogen production devices. Bipolar plates can separate fuel and oxidant, prevent gas from penetrating, and collect and conduct current. They have high conductivity. Through the flow channels designed and processed on the bipolar plates, the gas can be evenly distributed to the reaction layer of the electrode for electrode reaction, and heat can be discharged to keep the battery temperature field uniform.

However, the current bipolar plate manufacturing process requires the production of anode plates with anode side channels and cathode plates with cathode side channels. When manufacturing the electrolytic chamber, the positive plate, anode diffusion layer, membrane electrode, cathode diffusion layer and negative plate need to be stacked. After each electrode chamber is completed, a bipolar plate needs to be buckled outside the bipolar plate of the electrode chamber, and the cycle repeats. This results in a more complicated manufacturing process for bipolar plates, a larger number of bipolar plates, a higher production cost, and a single side of the bipolar plate needs to withstand a larger fluid pressure.

Summary of the invention

Therefore, the technical problem to be solved by the present application is to overcome the problem that the number of bipolar plates used in the prior art fuel cell and water electrolysis hydrogen production device is large, and one side needs to withstand a large fluid pressure. The defect of the relatively complicated manufacturing process of the electrode plate is overcome, so as to provide a bipolar plate, an electrolysis chamber, a fuel cell and a water electrolysis hydrogen production device, whose manufacturing process is relatively simple, the number of plates expressing the flow channel characteristics is small, the production cost is low, and the bipolar plate has better pressure-bearing capacity.

In order to solve the above problems, the first aspect of the present application provides a bipolar plate, comprising: a substrate; an anode side flow channel, which includes an anode main flow channel and an anode reaction zone flow channel connected to each other, the anode main flow channel passes through the substrate, and the anode reaction zone flow channel is formed on a first side of the substrate;

The cathode side flow channel comprises a cathode main flow channel and a cathode reaction zone flow channel which are connected to each other. The cathode main flow channel penetrates the substrate, and the cathode reaction zone flow channel is formed on the second side of the substrate.

Further, the anode side flow channel also includes an anode flow guide structure formed on the first side of the substrate and adapted to connect the anode main flow channel and the anode reaction zone flow channel; and/or,

The cathode side flow channel also includes a cathode flow guiding structure formed on the second side of the substrate and suitable for connecting the cathode main flow channel and the cathode reaction zone flow channel.

Furthermore, there are multiple anode reaction zone channels arranged in parallel with each other, the anode flow guiding structure includes an anode equal flow channel and multiple anode flow guiding channels, each anode flow guiding channel is suitable for connecting an anode reaction zone channel with the anode main flow channel, and the anode equal flow channel is suitable for connecting multiple anode flow guiding channels; and/or,

There are multiple cathode reaction zone flow channels that are arranged in parallel with each other. The cathode guide structure includes a cathode equal flow channel and multiple cathode guide channels. Each cathode guide channel is suitable for connecting a cathode reaction zone flow channel with the cathode main flow channel, and the cathode equal flow channel is suitable for connecting multiple cathode guide channels.

Further, the anode guide structure is formed on the first side of the substrate by a stamping process; or,

The anode guide structure is formed on the first side of the bipolar plate by an injection molding process; or,

The bipolar plate further includes a bridge covering the first side of the substrate, and an anode flow guide structure is formed between the substrate and the bridge.

Further, the cathode guide structure is formed on the second side of the substrate by a stamping process; or,

The cathode guide structure is formed on the second side of the substrate by an injection molding process; or,

The bipolar plate further includes a bridge covering the second side of the substrate, and a cathode flow guiding structure is formed between the substrate and the bridge.

Furthermore, there are two groups of anode main channels and cathode main channels, one group of anode main channels and one group of cathode main channels are respectively arranged at the two ends of the bipolar plate, and the anode main channels and the cathode main channels are staggered, the anode reaction zone flow channel is arranged between the two groups of anode main channels, and the cathode reaction zone flow channel is arranged between the two groups of cathode main channels.

Furthermore, the anode reaction zone flow channel and the cathode reaction zone flow channel are located at the same position on both sides of the substrate and are formed by a stamping process.

Further, the substrate includes a metal plate and an injection-molded frame wrapped around the outside of the metal plate, the anode reaction zone flow channel, the anode guide structure, the cathode reaction zone flow channel and the cathode guide structure are formed on the metal plate, the anode main flow channel and the cathode main flow channel are formed on the injection-molded frame, and the injection-molded frame is also formed with a first notch suitable for exposing the anode reaction zone flow channel and a second notch suitable for exposing the cathode reaction zone flow channel; or,

The bipolar plate also includes a metal plate and an injection-molded frame wrapped around the outside of the metal plate. The anode reaction zone flow channel, the anode guide structure, the cathode reaction zone flow channel, the cathode guide structure, the anode main channel and the cathode main channel are formed on the metal plate. The injection-molded frame is formed with a first notch suitable for exposing the anode reaction zone flow channel, a second notch suitable for exposing the cathode reaction zone flow channel, a third notch suitable for exposing the anode main channel and a fourth notch suitable for exposing the cathode main channel.

The injection molding frame is suitable for exposing a first sealing structure arranged around the first notch, a second sealing structure arranged around the second notch, a third sealing structure arranged around the third notch, and a fourth sealing structure arranged around the fourth notch.

The second aspect of the present application relates to an electrolysis chamber, comprising:

A first bipolar plate and a second bipolar plate, wherein the first bipolar plate and the second bipolar plate are both the bipolar plates provided by the first aspect of the present application, and the first side of the first bipolar plate is arranged toward the second side of the second bipolar plate;

The anode diffusion layer, the membrane electrode and the cathode diffusion layer are sequentially sandwiched between the first bipolar plate and the second between the bipolar plates.

The third aspect of the present application relates to a fuel cell, comprising the bipolar plate provided in the first aspect of the present application.

The fourth aspect of the present application relates to a water electrolysis hydrogen production device, including the bipolar plate involved in the first aspect of the present application.

This application has the following advantages:

1. The bipolar plate of the embodiment of the present application mainly forms an anode side flow channel and a cathode side flow channel on both sides of the substrate, so that one side of the bipolar plate can be used to guide the anode gas, and the other side can be used to guide the cathode gas, and the anode gas and the cathode gas can be reliably separated. Therefore, when the bipolar plate of the embodiment of the present application is used to manufacture a water electrolysis hydrogen production device or a fuel cell, the anode plate of each electrolysis chamber can be used as the cathode plate of the previous electrolysis chamber, and the cathode plate of each electrolysis chamber can be used as the anode plate of the next electrolysis chamber. On the premise that the number of electrolysis chambers remains unchanged, the use of the bipolar plate of the embodiment of the present application can greatly reduce the number of bipolar plates in the device, thereby reducing the cost of the device.

Furthermore, since only one bipolar plate needs to be arranged between every two electrolytic chambers, the step of buckling the two bipolar plates is omitted, thereby simplifying the manufacturing process. In addition, the inventors found that during the use of the bipolar plate of the embodiment of the present application, the two sides of the bipolar plate are respectively subjected to the pressure of the cathode gas and the anode gas, and the pressure of the cathode gas and the anode gas can offset each other, which makes the bipolar plate only need to bear the pressure difference of the gas on both sides, thereby greatly reducing the pressure borne by the bipolar plate and effectively improving the pressure-bearing capacity of the bipolar plate.

In addition, the bipolar plate of the embodiment of the present application can be used as both an anode plate and a cathode plate, which enables manufacturers to use a set of molds to simultaneously manufacture cathode plates and anode plates, thereby reducing mold costs and helping to shorten the design cycle of molds for manufacturing bipolar plates.

At the same time, to sum up, the bipolar plate of the embodiment of the present application can overcome the defects of the bipolar plate in the prior art, such as the relatively complex manufacturing process, large quantity, high production cost, and the need to withstand a large fluid pressure on one side. Its manufacturing process is relatively simple, the number of plates expressing the flow channel characteristics is small, the production cost is low, and it has better pressure-bearing capacity.

2. The electrode chamber of the second aspect of the present application includes or uses the bipolar plate of the first aspect of the present application, and therefore has the beneficial effects of the bipolar plate of the first aspect of the present application, namely, its manufacturing process is relatively simple, the number of plates expressing flow channel characteristics used is small, the production cost is low, and it has better pressure bearing capacity.

3. The fuel cell of the third aspect of the present application includes or uses the bipolar plate of the first aspect of the present application, and therefore has the beneficial effects of the bipolar plate of the first aspect of the present application, namely, its manufacturing process is relatively simple, the production cost is low, the number of plates expressing the flow channel characteristics is small while the number of electrolysis chambers remains unchanged, and the bipolar plate has better pressure-bearing capacity.

4. The water electrolysis hydrogen production device of the fourth aspect of the present application includes or uses the bipolar plate of the first aspect of the present application, and therefore has the beneficial effects of the bipolar plate of the first aspect of the present application, that is, its manufacturing process is relatively simple, the production cost is low, the number of plates expressing the flow channel characteristics used is small while the number of electrolysis chambers remains unchanged, and the bipolar plate has better pressure-bearing capacity.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

FIG1 shows a bipolar plate of Example 1 of the present application;

FIG2 shows a bipolar plate of Example 1 of the present application, and hides its first sealing structure, second sealing structure, third sealing structure and fourth sealing structure;

FIG3 is a transverse cross-sectional view of a bipolar plate of Example 1 of the present application;

FIG4 is the anode side of the metal plate of the bipolar plate of Example 1 of the present application;

FIG5 is a diagram showing the cathode side of the metal plate of the bipolar plate of Example 1 of the present application;

FIG6 is a partial side sectional view of the electrolysis chamber of Example 2 of the present application.

Description of reference numerals:

100, bipolar plate; 11, anode main flow channel; 12, anode reaction zone flow channel; 14, anode guide structure; 141, anode equal flow channel; 142, anode guide channel; 21, cathode main flow channel; 22, cathode reaction zone flow channel; 24, cathode guide structure; 241, cathode equal flow channel; 242, cathode guide channel; 3, metal plate; 4, injection molding frame; 41, first notch; 42, second notch; 43, third notch; 44, fourth notch; 51, first sealing structure; 52, second sealing structure; 53, third sealing structure; 54, fourth sealing structure; 200, anode diffusion layer; 201, membrane electrode; 202, cathode diffusion layer.

DETAILED DESCRIPTION

The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

In the description of this application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate positions or location relationships based on the attached The orientation or positional relationship shown in the figure is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

Example 1

FIG1 shows a bipolar plate of Example 1 of the present application. FIG2 shows a bipolar plate of Example 1 of the present application, and hides its first sealing structure, second sealing structure, third sealing structure and fourth sealing structure. FIG3 is a transverse cross-sectional view of the bipolar plate of Example 1 of the present application. As shown in FIG1, FIG2 and FIG3, the present embodiment relates to a bipolar plate 100, comprising a substrate, an anode side flow channel and a cathode side flow channel. Among them, the anode side flow channel comprises an anode main flow channel 11 and an anode reaction zone flow channel 12 connected to each other, the anode main flow channel 11 passes through the substrate, and the anode reaction zone flow channel 12 is formed on the first side of the substrate. The cathode side flow channel comprises a cathode main flow channel 21 and a cathode reaction zone flow channel 22 connected to each other. The cathode main flow channel 21 passes through the substrate, and the cathode reaction zone flow channel 22 is formed on the second side of the substrate.

The bipolar plate of the embodiment of the present application mainly forms an anode side flow channel and a cathode side flow channel on both sides of the substrate. The bipolar plate of the embodiment of the present application is used in a water electrolysis hydrogen production device or a fuel cell, and the anode plate of each electrolysis chamber can be used as the cathode plate of the previous electrolysis chamber, and the cathode plate of each electrolysis chamber can be used as the anode plate of the next electrolysis chamber. Under the premise that the number of electrolysis chambers remains unchanged, the use of the bipolar plate of the embodiment of the present application can greatly reduce the number of bipolar plates in the device, thereby reducing the cost of the device.

Since only one bipolar plate is required between each two electrolytic chambers, the step of buckling the two bipolar plates is omitted, thereby simplifying the manufacturing process. In addition, the inventors found that during the use of the bipolar plate of the embodiment of the present application, the two sides of the bipolar plate are respectively subjected to the pressure of the cathode gas and the anode gas, and the pressure of the cathode gas and the anode gas can offset each other. This allows the bipolar plate to only bear the pressure difference of the gas on both sides, thereby greatly reducing the pressure on the bipolar plate and effectively improving the pressure-bearing capacity of the bipolar plate.

In addition, the bipolar plate of the embodiment of the present application can be used as both an anode plate and a cathode plate, which enables manufacturers to use a set of molds to simultaneously manufacture the cathode plate and the anode plate, thereby reducing the cost of the molds and helping to shorten the design cycle of the molds for manufacturing the bipolar plates.

At the same time, to sum up, the bipolar plate of the embodiment of the present application can overcome the defects of the bipolar plate in the prior art, such as the relatively complex manufacturing process, large quantity, high production cost, and the need to withstand a large fluid pressure on one side. Its manufacturing process is relatively simple, the production cost is low, and the number of plates expressing the flow channel characteristics is small while the number of electrolytic chambers remains unchanged, and the bipolar plate has better pressure-bearing capacity.

The anode reaction zone flow channel 12 may be arranged to be directly connected to the anode main flow channel 11. Optionally, In this embodiment, the anode side flow channel further includes an anode flow guiding structure 14. The anode flow guiding structure 14 is disposed on the first side of the substrate and is adapted to connect the anode main flow channel 11 and the anode reaction zone flow channel 12.

Optionally, in the present embodiment, as shown in FIG4 , the anode reaction zone flow channel 12 is multiple and arranged in parallel with each other. The anode flow guiding structure 14 includes an anode equal flow channel 141 and multiple anode flow guiding channels 142. Each anode flow guiding channel 142 is suitable for connecting an anode reaction zone channel with the anode main flow channel 11. The anode equal flow channel 141 is suitable for connecting multiple anode flow guiding channels 142. The anode flow guiding channel 142 can connect the anode main flow channel 11 with the anode reaction zone flow channel 12. When the anode flow guiding channel 142 is partially in an undesirable condition, the anode equal flow channel 141 can balance the pressure and ensure that the liquid in the multiple anode flow guiding channels 142 flows out as evenly as possible, so that the anode gas in the anode reaction zone flow channel is as uniform as possible, which helps to improve the reaction efficiency of the anode reaction. The anode flow guiding structure 14 can be optionally formed with multiple rectangular bumps or circular bumps, and the anode equal flow channel 141 and the anode flow guiding channel 142 are formed around the rectangular bumps or circular bumps.

The cathode reaction zone flow channel 22 may be directly connected to the cathode main flow channel. Optionally, in this embodiment, the cathode side flow channel further includes a cathode flow guiding structure 24. The cathode flow guiding structure 24 is formed on the second side of the substrate and is suitable for connecting the cathode main flow channel 21 and the cathode reaction zone flow channel 22.

In the embodiment shown in FIG. 5 , there are multiple cathode reaction zone flow channels 22 which are arranged in parallel with each other, and the cathode flow guiding structure 24 includes a cathode equal flow channel 241 and multiple cathode flow guiding channels 242. Each cathode flow guiding channel 242 is suitable for connecting a cathode reaction zone flow channel with the cathode main flow channel 21. The cathode equal flow channel 241 is suitable for connecting multiple cathode flow guiding channels 242. The cathode flow guiding channel 242 is suitable for connecting the cathode main flow channel 21 and the cathode reaction zone flow channel 22. When there is a non-ideal condition in a part of the cathode flow guiding channel 242, the cathode equal flow channel 241 can balance the pressure to ensure that the liquid in the multiple cathode flow guiding channels 242 flows out as smoothly as possible. The cathode flow guiding structure 24 may be optionally formed with multiple rectangular protrusions or circular protrusions. shaped protrusions, the cathode equalizing channel 241 and the cathode guide channel 242 are formed around the rectangular protrusions or the circular protrusions.

In this embodiment, the anode flow guide structure 14 may be formed on the first side of the substrate by a stamping process. The anode flow guide structure 14 may also be formed on the first side of the bipolar plate 100 by an injection molding process. The injection molding material is preferably plastic, such as PEEK modification, PTFE modification, PSU modification, PI modification, etc.; it has sufficient strength and rigidity to ensure the mechanical properties, corrosion resistance and insulation properties of the electrolytic cell under working conditions. The bipolar plate 100 may also be selected to include a bridge covered on the first side of the substrate, and the anode flow guide structure 14 is formed between the substrate and the bridge. The bridge is preferably but not limited to being made of materials such as plastic or metal. The anode flow guide structure 14 may be formed on the substrate, may be formed on the bridge, and may be partially formed on the substrate and partially formed on the bridge. The bridge preferably but not limited to includes a cover plate and a flow guide channel formed under the cover plate. When the cover plate is covered on the substrate, an anode flow guide structure 14 is formed between the cover plate and the substrate.

In this embodiment, the cathode flow guiding structure 24 may be formed on the second side of the substrate by a stamping process. The cathode flow guiding structure 24 may also be formed on the second side of the substrate by an injection molding process. The injection molding material is preferably plastic, such as PEEK modification, PTFE modification, PSU modification, PI modification, etc.; it has sufficient strength and rigidity to ensure the mechanical properties, corrosion resistance and insulation properties of the electrolyzer under working conditions. The bipolar plate 100 also includes a bridge covered on the second side of the substrate, and the cathode flow guiding structure 24 is formed between the substrate and the bridge. The bridge is preferably but not limited to being made of materials such as plastic or metal. The cathode flow guiding structure 24 may be formed on the substrate, may be formed on the bridge, or may be partially formed on the substrate and partially formed on the bridge. The bridge preferably but not limited to includes a cover plate and a flow guiding channel formed under the cover plate. When the cover plate is covered on the substrate, a cathode flow guiding structure 24 is formed between the cover plate and the substrate.

Optionally, in this embodiment, the anode main channel 11 and the cathode main channel 21 are both provided in two groups. A group of anode main channels 11 and a group of cathode main channels 21 are provided at both ends of the bipolar plate 100, and The anode main flow channel 11 and the cathode main flow channel 21 are arranged alternately. The anode reaction zone flow channel 12 is arranged between two groups of the anode main flow channels 11, and the cathode reaction zone flow channel 22 is arranged between two groups of the cathode main flow channels 21. This enables the anode main flow channel 11 and the cathode main flow channel 21 to be connected to the anode reaction zone flow channel 12 and the cathode reaction zone flow channel 22 respectively through a guide structure of moderate length, and enables the space of the reaction zone to be fully utilized.

Optionally, in this embodiment, the anode reaction zone flow channel 12 and the cathode reaction zone flow channel 22 are located at the same position on both sides of the substrate and are formed by a stamping process. The anode reaction zone flow channel 12 and the cathode reaction zone flow channel 22 can be formed on both sides of the substrate at the same time by a single stamping. The anode reaction zone flow channel 12 and the cathode reaction zone flow channel 22 on the bipolar plate 100 in the prior art are generally made by an etching process. The material thickness used in the etching process is generally about 3 mm, and the process cost is relatively high (generally about 2,000 yuan), and it takes a long time. The bipolar plate 100 of this embodiment is made by a stamping process, which greatly reduces the thickness of the bipolar plate 100 (the thickness of the bipolar plate 100 can be reduced to about 0.5 mm. Therefore, the bipolar plate of this embodiment uses a stamping process to form the anode reaction zone flow channel 12 and the cathode reaction zone flow channel 22 on both sides of the substrate at one time, which not only saves material costs, but also the stamping process itself is relatively cheap, thereby greatly reducing the manufacturing cost of the bipolar plate and improving the manufacturing efficiency of the bipolar plate.

In addition, although the bipolar plate 100 of the present embodiment is thin, since the anode side flow channel and the cathode side flow channel are formed on both sides, the pressure on both sides of the bipolar plate 100 can offset each other, which makes the pressure that the bipolar plate 100 of the present embodiment needs to withstand much less than the bipolar plate 100 in the prior art. Therefore, the pressure bearing capacity of the bipolar plate of the present embodiment is still better than the pressure bearing capacity of the bipolar plate in the prior art, and the material cost of the bipolar plate is saved without shortening the service life of the bipolar plate 100.

In this embodiment, the substrate includes a metal plate 3 and an injection molding frame 4 wrapped around the outside of the metal plate 3. The anode reaction zone flow channel 12, the anode flow guide structure 14, the cathode reaction zone flow channel 22 and the cathode flow guide structure 24 are formed on the metal plate 3. The anode main flow channel 11 and the cathode main flow channel 21 are formed on the injection molding frame 4. The injection molding frame 4 also has a first notch 41 and a second notch 42 for exposing the anode reaction zone flow channel 12. The second notch 42 is suitable for exposing the cathode reaction zone flow channel 22. The metal plate 3 is preferably but not limited to being made of pure titanium or stainless steel plated with titanium.

The bipolar plate 100 further includes a metal plate 3 and an injection molding frame 4 wrapped around the outside of the metal plate 3. The anode reaction zone flow channel 12, the anode flow guide structure 14, the cathode reaction zone flow channel 22, the cathode flow guide structure 24, the anode main flow channel 11, the anode main flow channel 11 and the cathode main flow channel 21 are formed on the metal plate 3. The injection molding frame 4 is formed with a first notch 41 suitable for exposing the anode reaction zone flow channel 12, a second notch 42 suitable for exposing the cathode reaction zone flow channel 22, a third notch 43 suitable for exposing the anode main flow channel 11 and a fourth notch 44 suitable for exposing the cathode main flow channel 21.

In this embodiment, the injection molding frame 4 is formed with a first sealing structure 51 disposed around the first notch 41, a second sealing structure 52 disposed around the second notch 42, a third sealing structure 53 disposed around the third notch 43, and a fourth sealing structure 54 disposed around the fourth notch 44. The first sealing structure 51, the second sealing structure 52, the third sealing structure 53, and the fourth sealing structure 54 are preferably, but not limited to, sealing gaskets, or waterlines disposed around the notches of the injection molding frame 4.

The bipolar plate 100 of this embodiment forms a sealing structure on the injection molding frame 4, thereby reducing the thickness of the sealing structure. At this time, applying a pressure of about 3 MPA to the bipolar plate 100 can ensure that the fluid does not leak, reducing the pressure that needs to be applied to the sealing structure to ensure sealing. In addition, water lines are easily formed on the injection molding frame 4, which helps to increase the number of water lines, thereby further improving the sealing effect.

Example 2

Embodiment 2 relates to an electrolysis chamber. As shown in FIG6 , the electrolysis chamber of Embodiment 2 includes a first bipolar plate, a second bipolar plate, an anode diffusion layer 200, a membrane electrode 201, and a cathode diffusion layer 202. The first bipolar plate and the second bipolar plate are both bipolar plates 100 of Embodiment 1 of the utility model. The first side of the first bipolar plate faces the second side of the second bipolar plate. The anode diffusion layer 200, the membrane electrode 201, and the cathode diffusion layer 202 are sequentially sandwiched between the first bipolar plate and the second bipolar plate.

The electrolysis chamber of embodiment 2 includes or uses the electrolysis chamber of embodiment 1 of the present application, and thus has its beneficial effects, its manufacturing process is relatively simple, and its production cost is low. The number of plates expressing the flow channel characteristics is kept constant, and the bipolar plate has better pressure bearing capacity. Its manufacturing process is relatively simple and has better pressure bearing capacity.

Example 3

Embodiment 3 relates to a fuel cell, which includes the bipolar plate 100 involved in Embodiment 1 of the present application, and thus has its beneficial effects, namely, its manufacturing process is relatively simple, the production cost is low, the number of plates expressing flow channel characteristics is small under the premise of the same number of electrolytic chambers, and the bipolar plate has better pressure bearing capacity. Its manufacturing process is relatively simple and has better pressure bearing capacity.

Example 4

Embodiment 4 relates to a water electrolysis hydrogen production device, which includes the bipolar plate 100 involved in Embodiment 1 of the present application, and thus has the beneficial effects of the bipolar plate 100 of Embodiment 1, and its manufacturing process is relatively simple, the production cost is low, the number of plates expressing the flow channel characteristics is small under the premise that the number of electrolysis chambers remains unchanged, and the bipolar plate has better pressure bearing capacity. Its manufacturing process is relatively simple and has better pressure bearing capacity.

Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of this application.

Claims (12)

A bipolar plate, characterized by comprising: Substrate; an anode side flow channel, comprising an anode main flow channel (11) and an anode reaction zone flow channel (12) connected to each other, wherein the anode main flow channel (11) penetrates the substrate, and the anode reaction zone flow channel (12) is formed on a first side of the substrate; The cathode side flow channel comprises a cathode main flow channel (21) and a cathode reaction zone flow channel (22) which are connected to each other, wherein the cathode main flow channel (21) penetrates the substrate, and the cathode reaction zone flow channel (22) is formed on the second side of the substrate. The bipolar plate according to claim 1, characterized in that the anode side flow channel further comprises an anode flow guide structure (14) formed on the first side of the substrate and suitable for connecting the anode main flow channel (11) and the anode reaction zone flow channel (12); and/or, The cathode side flow channel also includes a cathode flow guiding structure (24) formed on the second side of the substrate and suitable for connecting the cathode main flow channel (21) and the cathode reaction zone flow channel (22). The bipolar plate according to claim 2, characterized in that the anode reaction zone channels are multiple and arranged in parallel with each other, the anode flow guiding structure (14) comprises an anode flow equalizing channel (141) and multiple anode flow guiding channels (142), each anode flow guiding channel (142) is suitable for connecting one of the anode reaction zone channels with the anode main flow channel (11), and the anode flow equalizing channel (141) is suitable for connecting multiple anode flow guiding channels (142); and/or, The cathode reaction zone flow channels are multiple and arranged in parallel with each other. The cathode flow guiding structure (24) comprises a cathode equal flow channel (241) and multiple cathode flow guiding channels (242). Each cathode flow guiding channel (242) is suitable for connecting one of the cathode reaction zone flow channels with the cathode main flow channel (21). The cathode equalizing channel (241) is suitable for connecting a plurality of cathode conducting channels (242). The bipolar plate according to claim 2, characterized in that the anode flow guide structure (14) is formed on the first side of the substrate by a stamping process; or, The anode flow guide structure (14) is formed on the first side of the bipolar plate (100) by an injection molding process; or, The bipolar plate (100) further comprises a bridge covering the first side of the substrate, and the anode flow guide structure (14) is formed between the substrate and the bridge. The bipolar plate according to claim 2, characterized in that the cathode flow guide structure (24) is formed on the second side of the substrate by a stamping process; or, The cathode guide structure (24) is formed on the second side of the substrate by an injection molding process; or, The bipolar plate (100) further comprises a bridge covering the second side of the substrate, and the cathode flow guiding structure (24) is formed between the substrate and the bridge. The bipolar plate according to any one of claims 1 to 5, characterized in that the anode main channel (11) and the cathode main channel (21) are both in two groups, and one group of anode main channels (11) and one group of cathode main channels (21) are respectively arranged at two ends of the bipolar plate (100), and the anode main channels (11) and the cathode main channels (21) are arranged alternately, the anode reaction zone flow channel (12) is arranged between the two groups of the anode main channels (11), and the cathode reaction zone flow channel (22) is arranged between the two groups of the cathode main channels (21). The bipolar plate according to any one of claims 1 to 5, characterized in that the anode reaction zone flow channel (12) and the cathode reaction zone flow channel (22) are located at the same position on both sides of the substrate and are formed by a stamping process. The bipolar plate according to any one of claims 1 to 5, characterized in that the substrate comprises a metal plate (3) and an injection-molded frame (4) wrapped around the outside of the metal plate (3), the anode reaction zone flow channel (12), the anode flow guide structure (14), the cathode reaction zone flow channel (22) and the cathode flow guide structure (24) are formed on the metal plate (3), and the anode main flow channel (11) and the cathode main flow channel (12) are formed on the metal plate (3). The channel (21) is formed on the injection molding frame (4), and the injection molding frame (4) is also formed with a first notch (41) suitable for exposing the anode reaction zone channel (12) and a second notch (42) suitable for exposing the cathode reaction zone channel (22); or, The bipolar plate (100) further comprises a metal plate (3) and an injection-molded frame (4) wrapped around the outside of the metal plate (3); the anode reaction zone flow channel (12), the anode flow guide structure (14), the cathode reaction zone flow channel (22), the cathode flow guide structure (24), the anode main flow channel (11) and the cathode main flow channel (21) are formed on the metal plate (3); and the injection-molded frame (4) is provided with a first notch (41) suitable for exposing the anode reaction zone flow channel (12), a second notch (42) suitable for exposing the cathode reaction zone flow channel (22), a third notch (43) suitable for exposing the anode main flow channel (11) and a fourth notch (44) suitable for exposing the cathode main flow channel (21). The bipolar plate according to claim 8, characterized in that a first sealing structure (51) arranged around the first notch (41), a second sealing structure (52) arranged around the second notch (42), a third sealing structure (53) arranged around the third notch (43), and a fourth sealing structure (54) arranged around the fourth notch (44) are formed on the injection molded frame (4). An electrolysis chamber, characterized in that it comprises: a first bipolar plate and a second bipolar plate, wherein the first bipolar plate and the second bipolar plate are both bipolar plates (100) as claimed in any one of claims 1 to 9, and a first side of the first bipolar plate is arranged toward a second side of the second bipolar plate; An anode diffusion layer (200), a membrane electrode (201) and a cathode diffusion layer (202) are sequentially sandwiched between the first bipolar plate and the second bipolar plate. A fuel cell, characterized by comprising a bipolar plate (100) according to any one of claims 1 to 9. A device for producing hydrogen by electrolysis of water, characterized by comprising a bipolar plate (100) as described in any one of claims 1 to 9.