System for producing bipolar polar plate

Abstract

The utility model discloses a system for producing a bipolar polar plate, which relates to the technical field of nickel-metal hydride batteries and comprises a flaking mechanism, a rolling mechanism, a welding mechanism and a slicing mechanism, the sheet production mechanism comprises a positive electrode sheet production mechanism and a negative electrode sheet production mechanism, and the positive electrode sheet production mechanism is used for loading a positive electrode active material in a first porous layer to obtain a positive electrode sheet; the negative pole piece preparation mechanism is used for loading a negative pole active material in the second porous layer to obtain a negative pole piece; the rolling mechanism is a double-roller machine and is used for rolling the positive plate, the conductive substrate and the negative plate into a whole; the welding mechanism is used for respectively welding and fixing the first porous layer and the second porous layer in the positive plate and the negative plate with the front surface and the back surface of the conductive substrate; the slicing mechanism is used for slicing and forming the welded bipolar polar plate; the production efficiency and quality of the bipolar polar plate are improved, the production cost is reduced, and the technical problems that in the prior art, an existing bipolar polar plate production mode is low in production efficiency, unstable in product quality, high in cost and the like are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of nickel-hydrogen batteries, and in particular relates to a system for producing bipolar plates. Background Art

[0002] As fossil fuels become increasingly scarce in the face of large-scale human development and utilization, the development and utilization of hydrogen energy has received increasing attention in recent years. Nickel-metal hydride batteries are gaining increasing attention as a key area for hydrogen energy applications. Currently, nickel-metal hydride batteries have a voltage of 1.2-1.3V and a low energy density, while bipolar nickel-metal hydride batteries offer higher energy density. Bipolar plates play a vital role in energy storage and conversion applications, such as fuel cells and water electrolysis systems.

[0003] However, existing bipolar plate production methods often suffer from low production efficiency, unstable product quality, and high costs. Therefore, an innovative production system is needed to improve the production efficiency and quality of bipolar plates and reduce production costs. Utility Model Content

[0004] The purpose of the present invention is to provide a system for producing bipolar plates to solve the technical problems in the background art that "existing bipolar plate production methods often have low production efficiency, unstable product quality, high cost, etc."

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A system for producing bipolar plates, comprising a plate making mechanism, a rolling mechanism, a welding mechanism, and a slicing mechanism;

[0007] The film-making mechanism includes a positive electrode film-making mechanism and a negative electrode film-making mechanism. The positive electrode film-making mechanism is used to load the positive electrode active material into the first porous layer to obtain a positive electrode sheet; the negative electrode film-making mechanism is used to load the negative electrode active material into the second porous layer to obtain a negative electrode sheet.

[0008] The rolling mechanism is a roller machine, which is used to roll the positive electrode sheet, the conductive substrate, and the negative electrode sheet into a whole;

[0009] The welding mechanism is used to weld and fix the first porous layer and the second porous layer in the positive electrode sheet and the negative electrode sheet to the front and back surfaces of the conductive substrate respectively;

[0010] The slicing mechanism is used to slice and shape the welded bipolar plates.

[0011] The above technical solution has the following beneficial effects: compared with the existing technology, a system for producing bipolar plates has made effective improvements to the overall structure and assembly method of the film-making mechanism, the rolling mechanism, the welding mechanism and the slicing mechanism; the active material of the electrode is loaded into the porous layer by the positive and negative electrode film-making mechanisms of the film-making mechanism to obtain the positive and negative electrode sheets; the positive electrode sheet, the conductive substrate and the negative electrode sheet are rolled into a whole by the roller machine of the rolling mechanism; the first porous layer and the second porous layer in the positive electrode sheet and the negative electrode sheet are respectively welded and fixed to the front and back sides of the conductive substrate by the welding mechanism; the welded bipolar plate is sliced ​​and formed by the slicing mechanism; to ensure that the production efficiency and quality of the bipolar plate are improved, the production cost is reduced, etc., so as to solve the technical problems in the existing technology that "the existing bipolar plate production method often has low production efficiency, unstable product quality, high cost, etc."

[0012] Technical issues.

[0013] In a preferred embodiment, the positive electrode sheeting mechanism includes a discharge roller, a first guide roller, a slurry hopper, a second guide roller, a squeeze roller, a scraper and an oven;

[0014] The output end of the discharge roller is connected to the input end of the first guide roller, the output end of the first guide roller is connected to the input end of the second guide roller, the output end of the second guide roller is connected to the input end of the squeeze roller, the output end of the squeeze roller is connected to the input end of the scraper, and the output end of the scraper is connected to the oven. The second guide roller is arranged in the slurry hopper, and the slurry hopper is provided with a space for accommodating the positive electrode slurry, so that when the first porous layer passes through the slurry hopper, the positive electrode slurry is immersed in the first porous layer;

[0015] The discharge roller is used for discharging the first porous layer. The first porous layer material belt enters the slurry hopper through the first guide roller. The positive electrode slurry is immersed in the first porous layer and guided by the second guide roller. The squeezing roller includes two pressing rollers, which are used to squeeze and remove bubbles from the slurry on the front and back sides of the first porous layer, and use a scraper to flatten the surface. After oven drying, the positive electrode sheet is obtained.

[0016] The above technical solution has the following beneficial effects: the first porous layer is discharged through the discharge roller, the first porous layer material is brought into the slurry hopper through the first guide roller, the positive electrode slurry is immersed in the first porous layer, guided by the second guide roller, and then the slurry on the front and back sides of the first porous layer is squeezed and defoamed by the squeezing roller, the surface is flattened by a scraper, and then dried in an oven to obtain the positive electrode sheet, further ensuring the improvement of the production efficiency and quality of the bipolar plate and reducing the production cost.

[0017] In a preferred embodiment, the oven comprises a first input end, a first output end, a third guide roller, a fourth guide roller, a second input end, and a second output end;

[0018] The output end of the scraper is connected to the first input end, the first output end is connected to the input end of the third guide roller, the output end of the third guide roller is connected to the input end of the fourth guide roller, the output end of the fourth guide roller is connected to the second input end, and the second output end is connected to the input end of the rolling mechanism.

[0019] The above technical solution has the following beneficial effects: by adding a first input end, a first output end, a second input end and a second output end to the oven, the first porous layer is transported from the first input end to the first output end for preliminary drying treatment to ensure the stability of the positive electrode slurry and the first porous layer, so as to prevent the positive electrode slurry from powdering or falling off, thereby causing unstable product quality and high cost, and at the same time is beneficial to improving the bonding strength of the conductive layer; the first porous layer after the preliminary drying treatment is transported from the second input end to the second output end through the third guide roller and the fourth guide roller for secondary drying treatment to further ensure the stability of the positive electrode slurry, the conductive layer and the first porous layer, so as to prevent the positive electrode slurry from powdering or falling off, thereby causing unstable product quality and high cost, etc.

[0020] In a preferred solution, the negative electrode film making mechanism is consistent with the positive electrode film making mechanism.

[0021] The above technical solution has the beneficial effects of: by keeping the negative electrode production mechanism consistent with the positive electrode production mechanism, it further ensures that the production efficiency and quality of bipolar plates are improved, and the production cost is reduced.

[0022] Preferably, a paint sprayer is provided between the output end of the third guide roller and the input end of the fourth guide roller; the output end of the paint sprayer is provided on the upper surface relative to the first porous layer, for spraying the conductive layer on the upper surface of the first porous layer.

[0023] The above technical solution has the following beneficial effects: by arranging a paint sprayer between the output end of the third guide roller and the input end of the fourth guide roller, the paint sprayer is used to spray the conductive layer on the upper surface of the first porous layer to ensure that the conductivity and heat dissipation performance of the positive electrode active material layer are improved, the ohmic internal resistance and electrochemical internal resistance are reduced, and at the same time, it can prevent the positive electrode active material from falling off and falling off, and improve the high current charge and discharge performance and cycle life of the nickel-hydrogen battery.

[0024] In a preferred embodiment, a paint spraying machine is provided on the lower surface of the second porous layer for spraying the conductive layer and the catalytic layer on the lower surface of the second porous layer.

[0025] The above technical solution has the following beneficial effects: a paint spraying machine is provided on the lower surface of the second porous layer, and the paint spraying machine is used to spray a conductive layer on the lower surface of the second porous layer to ensure that the conductivity and heat dissipation performance of the negative electrode active material layer are improved, and the ohmic internal resistance and electrochemical internal resistance are reduced. At the same time, it can prevent the negative electrode active material from falling off and falling off, and improve the high current charge and discharge performance and cycle life of the nickel-hydrogen battery; by spraying a catalytic layer, such as a potassium borohydride coating or a sodium borohydride coating, the catalytic layer can release hydrogen, which is conducive to forming a nickel layer on the surface of the alloy, improving its conductivity, thereby improving the high current charge and discharge performance and cycle life of the nickel-hydrogen battery.

[0026] In a preferred solution, the first porous layer and the second porous layer are made of metal, preferably one of foamed nickel, copper mesh, punched nickel belt, copper mesh, steel mesh, and punched steel belt.

[0027] The above technical solution has the following beneficial effects: by using metal materials for the first porous layer and the second porous layer, the bonding strength between the active material and the conductive substrate is enhanced, and the use of metal materials with good conductivity can reduce the interface resistance; at the same time, the porosity between the negative electrode active material layer and the conductive substrate can be increased, solving the problem of easy accumulation of oxygen in nickel-hydrogen batteries.

[0028] In a preferred embodiment, the conductive layer is one of a carbon coating, a metal coating, and a conductive polymer coating.

[0029] The above technical solution has the beneficial effects of: by using carbon coating, metal coating, and conductive polymer coating for the conductive layer, it can not only improve the conductivity of the active material layer, but also serve as an anti-corrosion layer to prevent the active material from corroding and causing powder loss and falling off.

[0030] In a preferred embodiment, the projected areas of the first porous layer and the second porous layer are smaller than or equal to the projected area of ​​the conductive substrate.

[0031] The above technical solution has the beneficial effect of ensuring that the connection between the first porous layer, the second porous layer and the conductive substrate is stable by making the projected areas of the first porous layer and the second porous layer less than or equal to the projected area of ​​the conductive substrate.

[0032] In a preferred embodiment, the coating area of ​​the positive electrode active material is smaller than the projected area of ​​the first porous layer, and the coating area of ​​the negative electrode active material is smaller than the projected area of ​​the second porous layer.

[0033] The above technical solution has the beneficial effects of: by making the coating area of ​​the positive electrode active material smaller than the projected area of ​​the first porous layer and the coating area of ​​the negative electrode active material smaller than the projected area of ​​the second porous layer, it ensures the convenience of welding the first porous layer, the second porous layer and the conductive substrate, and further ensures the stability of the connection between the first porous layer, the second porous layer and the conductive substrate.

[0034] In a preferred solution, the welding mechanism uses conventional equipment such as laser welding and ultrasonic welding, which is the existing technology in this field. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the specific implementation methods of the utility model 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 utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0036] Figure 1 This is a schematic diagram of the overall assembly of a system for producing bipolar plates provided in Example 1 of the present utility model;

[0037] Figure 2 A schematic top view of the overall structure of the bipolar plate provided in Example 1 of the present utility model;

[0038] Description of reference numerals;

[0039] 1-film-making mechanism; 2-rolling mechanism; 3-welding mechanism; 4-slicing mechanism; 5-conductive substrate; 6-first input end; 7-first output end; 8-second input end; 9-second output end; 10-paint sprayer; 11-positive electrode film-making mechanism; 111-discharging roller; 112-first guide roller; 113-slurry hopper; 114-second guide roller; 115-squeezing roller; 116-scraper; 117-oven; 118-third guide roller; 119-fourth guide roller; 12-negative electrode film-making mechanism. DETAILED DESCRIPTION

[0040] Example 1

[0041] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments.

[0042] like Figures 1 to 2 As shown, a system for producing bipolar plates includes a plate making mechanism 1, a rolling mechanism 2, a welding mechanism 3 and a slicing mechanism 4;

[0043] The film-making mechanism 1 includes a positive electrode film-making mechanism 11 and a negative electrode film-making mechanism 12. The positive electrode film-making mechanism 11 is used to load the positive electrode active material into the first porous layer to obtain a positive electrode sheet; the negative electrode film-making mechanism 12 is used to load the negative electrode active material into the second porous layer to obtain a negative electrode sheet.

[0044] The rolling mechanism 2 is a roller machine, which is used to roll the positive electrode sheet, the conductive substrate 5, and the negative electrode sheet into a whole;

[0045] The welding mechanism 3 is used to weld and fix the first porous layer and the second porous layer in the positive electrode sheet and the negative electrode sheet to the front and back surfaces of the conductive substrate 5 respectively;

[0046] The slicing mechanism 4 is used to slice and shape the bipolar plates after welding; by effectively improving the overall structure and assembly method of the film-making mechanism 1, the rolling mechanism 2, the welding mechanism 3 and the slicing mechanism 4, the active materials of the electrode plates are loaded into the porous layer by the positive and negative electrode film-making mechanisms of the film-making mechanism 1 to obtain positive and negative electrode plates; the positive electrode plate, the conductive substrate 4 and the negative electrode plate are rolled into a whole by the roller machine of the rolling mechanism 2; the first porous layer and the second porous layer in the positive electrode plate and the negative electrode plate are respectively welded and fixed to the front and back sides of the conductive substrate 5 by the welding mechanism 3; the bipolar plates after welding are sliced ​​and formed by the slicing mechanism 4; so as to ensure that the production efficiency and quality of the bipolar plates are improved, and the production cost is reduced.

[0047] In this embodiment, the positive electrode film making mechanism 11 includes a discharge roller 111, a first guide roller 112, a slurry hopper 113, a second guide roller 114, a squeeze roller 115, a scraper 116 and an oven 117;

[0048] The output end of the discharge roller 111 is connected to the input end of the first guide roller 112, the output end of the first guide roller 112 is connected to the input end of the second guide roller 114, the output end of the second guide roller 114 is connected to the input end of the squeeze roller 115, the output end of the squeeze roller 115 is connected to the input end of the scraper 116, and the output end of the scraper 116 is connected to the oven 117. The second guide roller 114 is arranged in the slurry hopper 113, and the slurry hopper 113 is provided with a space for accommodating the positive electrode slurry, so that when the first porous layer passes through the slurry hopper 113, the positive electrode slurry is immersed in the first porous layer;

[0049] The feeding roller 111 is used for feeding the first porous layer, the first porous layer tape enters the slurry hopper 113 through the first guide roller 112, the positive electrode slurry is immersed into the first porous layer, the second guide roller 114 is guided, the extrusion roller 115 includes two compression rollers, which are used for extruding and removing bubbles of the slurry on the front and back surfaces of the first porous layer, the scraper 116 is used for scraping the surface, the oven 117 is used for drying treatment, and the positive electrode sheet is obtained; the feeding roller 111 is used for feeding the first porous layer, the first porous layer tape enters the slurry hopper through the first guide roller 112, the positive electrode slurry is immersed into the first porous layer, the second guide roller 114 is guided, then the extrusion roller 115 is used for extruding and removing bubbles of the slurry on the front and back surfaces of the first porous layer, the scraper 116 is used for scraping the surface, and the oven 117 is used for drying treatment, so that the positive electrode sheet is obtained, and the production efficiency and quality of the bipolar plate are further improved, and the production cost is reduced.

[0050] In the embodiment, the oven 117 includes a first input end 6, a first output end 7, a third guide roller 118, a fourth guide roller 119, a second input end 8 and a second output end 9.

[0051] The output end of the scraper 116 is connected with the first input end 6, the first output end 7 is connected with the input end of the third guide roller 118, the output end of the third guide roller 118 is connected with the input end of the fourth guide roller 119, the output end of the fourth guide roller 119 is connected with the second input end 8, and the second output end 9 is connected with the input end of the rolling mechanism 2; by adding the first input end 6, the first output end 7, the second input end 8 and the second output end 9 to the oven 117, the first porous layer is conveyed from the first input end 6 to the first output end 7 and is subjected to preliminary drying treatment, so as to ensure the stability of the positive electrode slurry and the first porous layer, to prevent the positive electrode slurry from falling off and causing unstable product quality and high cost; the first porous layer subjected to the preliminary drying treatment is conveyed from the second input end 8 to the second output end 9 through the third guide roller 118 and the fourth guide roller 119 and is subjected to secondary drying treatment, so as to further ensure the stability of the positive electrode slurry and the first porous layer, to prevent the positive electrode slurry from falling off and causing unstable product quality and high cost.

[0052] In the embodiment, the negative electrode sheet making mechanism 12 is consistent with the positive electrode sheet making mechanism 11; by keeping the negative electrode sheet making mechanism 12 consistent with the positive electrode sheet making mechanism 11, the production efficiency and quality of the bipolar plate are further improved, and the production cost is reduced.

[0053] In this embodiment, a paint sprayer 10 is provided between the output end of the third guide roller 118 and the input end of the fourth guide roller 119; the output end of the paint sprayer 10 is provided on the upper surface relative to the first porous layer, and is used to spray the conductive layer on the upper surface of the first porous layer; by providing the paint sprayer 10 between the output end of the third guide roller 118 and the input end of the fourth guide roller 119, the paint sprayer 10 is used to spray the conductive layer on the upper surface of the first porous layer to ensure that the conductivity and heat dissipation performance of the positive electrode active material layer are improved, the ohmic internal resistance and electrochemical internal resistance are reduced, and at the same time, it can prevent the positive electrode active material from falling off and falling off, and improve the large current charging and discharging performance and cycle life of the nickel-hydrogen battery.

[0054] In this embodiment, a paint sprayer 10 is provided on the lower surface of the second porous layer, which is used to spray a conductive layer on the lower surface of the second porous layer; by providing a paint sprayer 10 on the lower surface of the second porous layer, the paint sprayer is used to spray a conductive layer on the lower surface of the second porous layer to ensure that the conductivity and heat dissipation performance of the negative active material layer are improved, the ohmic internal resistance and electrochemical internal resistance are reduced, and at the same time, the negative active material can be prevented from falling off and falling off, and the high current charge and discharge performance and cycle life of the nickel-hydrogen battery are improved.

[0055] In this embodiment, the first porous layer and the second porous layer are made of metal, preferably one of foam nickel, copper mesh, punched nickel strip, copper mesh, steel mesh, and punched steel strip; by using metal materials for the first porous layer and the second porous layer, the bonding force between the active material and the conductive substrate 5 is enhanced, and the use of metal materials with good conductivity can reduce the interface resistance; at the same time, the porosity between the negative electrode active material layer and the conductive substrate can be increased, solving the problem of easy accumulation of oxygen in the nickel-hydrogen battery.

[0056] In this embodiment, the conductive layer is one of a carbon coating, a metal coating, and a conductive polymer coating; by using a carbon coating, a metal coating, and a conductive polymer coating as the conductive layer, it is ensured that not only the conductivity of the active material layer can be improved, but also it can serve as an anti-corrosion layer to prevent the active material from corroding and causing powder loss and falling off.

[0057] In this embodiment, the projected areas of the first porous layer and the second porous layer are less than or equal to the projected area of ​​the conductive substrate 5; by making the projected areas of the first porous layer and the second porous layer less than or equal to the projected area of ​​the conductive substrate 5, the connection stability between the first porous layer, the second porous layer and the conductive substrate 5 is improved.

[0058] In this embodiment, the coating area of ​​the positive electrode active material is smaller than the projected area of ​​the first porous layer, and the coating area of ​​the negative electrode active material is smaller than the projected area of ​​the second porous layer; by making the coating area of ​​the positive electrode active material smaller than the projected area of ​​the first porous layer and the coating area of ​​the negative electrode active material smaller than the projected area of ​​the second porous layer, it is ensured that the first porous layer, the second porous layer and the conductive substrate are welded together, and further ensures the stability of the connection between the first porous layer, the second porous layer and the conductive substrate 5.

[0059] In this embodiment, the welding mechanism uses conventional equipment such as laser welding and ultrasonic welding, which are existing technologies in this field.

[0060] In this embodiment, both sides of the first porous layer and the second porous layer are fixed to the conductive substrate 5 by welding, and the welding positions are in any one of a cross, a square, and a circle shape.

[0061] In this embodiment, the first porous layer is transported from the first input end 6 to the first output end 7 and is preliminarily dried to 60%-80% to ensure the stability of the positive electrode slurry and the first porous layer, so as to prevent the positive electrode slurry from losing powder or falling off, thereby causing unstable product quality and high cost, and at the same time is beneficial to improving the bonding strength with the conductive layer; the first porous layer after the preliminary drying treatment is transported from the second input end 8 to the second output end 9 through the third guide roller 118 and the fourth guide roller 119, and is secondary dried to 100%, further ensuring the stability of the positive electrode slurry and the first porous layer, so as to prevent the positive electrode slurry and the conductive layer from losing powder or falling off, thereby causing unstable product quality and high cost, etc.

[0062] In this embodiment, before the first porous layer material belt and the second porous layer material belt pass through the first guide roller 112 and enter the slurry hopper 113, adhesive tape is affixed on both sides of their surfaces manually or by a adhesive laminating machine, and the adhesive tape is torn off before rolling to ensure that the first porous layer and the second porous layer are easily connected to the conductive substrate 5, and further ensure the stability of the connection between the first porous layer and the second porous layer and the conductive substrate 5; the following part is the existing conventional technology in this field and will not be described in detail.

[0063] In this embodiment, a plurality of guide rollers are further provided between the second output end 9 and the input end of the rolling mechanism 2 to ensure that the first porous layer and the second porous layer are easily guided.

[0064] Specific usage of this utility model:

[0065] Step 1: Start the discharge roller 111 to discharge the first and second porous layers. Tapes are applied to both sides of the surface manually or by a tape applicator. The first and second porous layer strips pass through the first guide roller 112 and enter the slurry hopper 113 respectively. The positive electrode slurry is immersed in the first porous layer, and the negative electrode slurry is immersed in the second porous layer.

[0066] Step 2: After being guided by the second guide roller 114, the slurry is transported to the squeezing roller 115 to squeeze and remove bubbles on the front and back surfaces of the first and second porous layers, and the surface is flattened by a scraper 116. The slurry is then transported to the oven 117 through the first input end 6 for preliminary drying at 60%-80%;

[0067] Step 3: The first porous layer after the preliminary drying treatment is transported to the third guide roller 118 through the first output end 7, and the conductive layer is sprayed on the upper surface of the first porous layer and the conductive layer is sprayed on the lower surface of the second porous layer by the material spraying machine 10;

[0068] Step 4: The positive and negative electrodes are transported from the second input end 8 to the second output end 9 by the third guide roller 118 and the fourth guide roller 119, and then dried for a second time to 100% to obtain positive and negative electrodes;

[0069] Step 5: tear off the tape on both sides of the first porous layer and the second porous layer manually or by machine, place the positive and negative electrode sheets on the upper and lower surfaces of the conductive substrate 5 through guide rollers, and use the roller machine of the rolling mechanism 2 to roll the positive electrode sheet, the conductive substrate 5, and the negative electrode sheet into a whole;

[0070] Step 6: The first porous layer and the second porous layer in the positive electrode sheet and the negative electrode sheet are respectively welded and fixed to the front and back surfaces of the conductive substrate 5 by the welding mechanism 3;

[0071] Step 7: Slice the welded bipolar plates into slices using the slicing mechanism 4.

[0072] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements that are inherent to such process, method, article or apparatus.

[0073] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention.

[0074] The above are only preferred embodiments of the present invention. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principles of the present invention, they can make several improvements, modifications or changes, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the concept and technical solution of the utility model to other occasions without improvement, should all be regarded as protection of the present utility model.

Claims

1. A system for producing bipolar plates, characterized in that: It comprises a film-making mechanism (1), a rolling mechanism (2), a welding mechanism (3) and a slicing mechanism (4); The film-making mechanism (1) comprises a positive electrode film-making mechanism (11) and a negative electrode film-making mechanism (12). The positive electrode film-making mechanism (11) is used to load the positive electrode active material into the first porous layer to obtain a positive electrode sheet; the negative electrode film-making mechanism (12) is used to load the negative electrode active material into the second porous layer to obtain a negative electrode sheet. The rolling mechanism (2) is a roller machine, which is used to roll the positive electrode sheet, the conductive substrate (5), and the negative electrode sheet into a whole; The welding mechanism (3) is used to weld and fix the first porous layer and the second porous layer in the positive electrode sheet and the negative electrode sheet to the front and back surfaces of the conductive substrate (5) respectively; The slicing mechanism (4) is used for slicing and shaping the welded bipolar plates.

2. A system for producing bipolar plates according to claim 1, characterized in that: The positive electrode film making mechanism (11) comprises a discharge roller (111), a first guide roller (112), a slurry hopper (113), a second guide roller (114), an extrusion roller (115), a scraper (116) and an oven (117); The output end of the discharge roller (111) is connected to the input end of the first guide roller (112), the output end of the first guide roller (112) is connected to the input end of the second guide roller (114), the output end of the second guide roller (114) is connected to the input end of the squeeze roller (115), the output end of the squeeze roller (115) is connected to the input end of the scraper (116), and the output end of the scraper (116) is connected to the oven (117). The second guide roller (114) is arranged in the slurry hopper (113), and the slurry hopper (113) is provided with a space for accommodating positive electrode slurry, so that when the first porous layer passes through the slurry hopper (113), the positive electrode slurry is immersed in the first porous layer; The discharge roller (111) is used for discharging the first porous layer. The first porous layer material belt enters the slurry hopper (113) through the first guide roller (112). The positive electrode slurry is immersed in the first porous layer and guided by the second guide roller (114). The squeezing roller (115) includes two pressing rollers, which are used to squeeze and remove bubbles from the slurry on the front and back sides of the first porous layer. The scraper (116) is used to flatten the surface. After drying in the oven (117), the positive electrode sheet is obtained.

3. A system for producing bipolar plates according to claim 2, characterized in that: The oven (117) comprises a first input end (6), a first output end (7), a third guide roller (118), a fourth guide roller (119), a second input end (8) and a second output end (9); The output end of the scraper (116) is connected to the first input end (6), the first output end (7) is connected to the input end of the third guide roller (118), the output end of the third guide roller (118) is connected to the input end of the fourth guide roller (119), the output end of the fourth guide roller (119) is connected to the second input end (8), and the second output end (9) is connected to the input end of the rolling mechanism (2).

4. A system for producing bipolar plates according to claim 2, characterized in that: The negative electrode film making mechanism (12) is consistent with the positive electrode film making mechanism (11).

5. A system for producing bipolar plates according to claim 3, characterized in that: A paint spraying machine (10) is provided between the output end of the third guide roller (118) and the input end of the fourth guide roller (119); the output end of the paint spraying machine (10) is provided on the upper surface relative to the first porous layer, and is used for spraying the conductive layer on the upper surface of the first porous layer.

6. A system for producing bipolar plates according to claim 4, characterized in that: A paint spraying machine (10) is provided on the lower surface of the second porous layer, for spraying a conductive layer on the lower surface of the second porous layer.

7. A system for producing bipolar plates according to claim 1, characterized in that: The first porous layer and the second porous layer are made of metal, preferably one of foam nickel, copper mesh, punched nickel belt, copper mesh, steel mesh, and punched steel belt.

8. A system for producing bipolar plates according to claim 5, characterized in that: The conductive layer is one of a carbon coating, a metal coating, and a conductive polymer coating.

9. The system for producing bipolar plates according to claim 1, wherein: The projected areas of the first porous layer and the second porous layer are smaller than or equal to the projected area of ​​the conductive substrate (5).

10. A system for producing bipolar plates according to claim 9, characterized in that: The coating area of ​​the positive electrode active material is smaller than the projected area of ​​the first porous layer, and the coating area of ​​the negative electrode active material is smaller than the projected area of ​​the second porous layer.

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