Preparation method and system of fuel cell stack and storage medium

Abstract

The invention provides a preparation method and system of a fuel cell stack and a storage medium, and the method comprises the following steps: obtaining an original fuel cell stack which comprises an original bipolar plate, an original gas diffusion layer and an original catalyst layer; obtaining a first bipolar plate based on a preset first segment number; obtaining a first gas diffusion layer based on a preset second segment number and the pre-configured first slurry; obtaining a second gas diffusion layer based on the emulsion with the preset concentration; obtaining a first catalyst layer based on the preset catalyst layer thickness and the preset catalyst content; obtaining a second catalyst layer based on the preset third segment number, the pre-configured second slurry and the pre-configured third slurry; and obtaining a first fuel cell stack based on the first bipolar plate, the second gas diffusion layer and the second catalyst layer so as to eliminate the problem of non-uniform power generation of the fuel cell stack in the operation process. According to the preparation method of the fuel cell stack provided by the invention, the problem of non-uniform power generation can be eliminated, the performance output is improved, and efficient use of the fuel cell stack is realized.

Description

Technical Field

[0001] This invention relates to the field of fuel cell stack design and manufacturing technology, and in particular to a method, system and storage medium for preparing a fuel cell stack. Background Technology

[0002] In existing fuel cell stack technology, a common problem is the uneven current density across different locations in the power generation area during stack operation (power generation). This issue causes accelerated degradation in localized areas of the stack and reduces the overall performance output, leading to a decrease in the overall stack efficiency. The cause of this problem is the mismatch between the design of key stack components and actual operating conditions: Firstly, the Pt loading of the CCM, the permeability of the GDL, and the opening ratio of the bipolar plates are all designed for uniformity; secondly, during actual power generation, gas concentration gradients, temperature gradients, and operating humidity gradients inevitably form inside the stack. It is this contradiction between the uniformity of component design and the changing operating conditions during actual stack operation that leads to the uneven distribution of power generation performance (current density).

[0003] Under the current technology background, the above-mentioned problem of uneven current density presents more prominent technical defects: First, the current density in the active area of ​​the fuel cell air inlet region is higher than that in other areas, and the excessively high local current density will accelerate the material decay in that area, thereby directly affecting the overall operating life of the fuel cell; Second, from the perspective of overall performance, the uneven distribution of current density on the active area of ​​the fuel cell will aggravate the polarization phenomenon of the fuel cell, resulting in a reduction in the overall performance output of the fuel cell, and ultimately causing a decrease in the efficiency of the entire fuel cell, making it difficult to meet the practical application requirements for high efficiency and long life of the fuel cell. Summary of the Invention

[0004] The present invention aims to provide a method, system and storage medium for preparing a fuel cell stack, so as to solve the above-mentioned technical problems, eliminate the problem of uneven power generation during the operation of the fuel cell stack, improve the performance output of the fuel cell stack, and ultimately realize the efficient use of the fuel cell stack.

[0005] To address the aforementioned technical problems, this invention provides a method for preparing a fuel cell stack, comprising: Obtain a raw fuel cell stack; wherein the raw fuel cell stack includes a raw bipolar plate, a raw gas diffusion layer, and a raw catalyst layer; Based on the preset first segment number and the original bipolar plate, obtain the first bipolar plate; Based on the preset second segment number and the pre-configured first slurry, the original gas diffusion layer is coated to obtain the first gas diffusion layer; The first gas diffusion layer is impregnated with an emulsion of a preset concentration to obtain a second initial gas diffusion layer, and the second initial gas diffusion layer is squeezed to obtain a second gas diffusion layer. Based on the preset catalyst layer thickness and preset catalyst content, the original catalyst layer is adjusted to obtain the first catalyst layer; Based on the preset third segment number, the pre-configured second slurry and the pre-configured third slurry, the first catalyst layer is coated to obtain the second catalyst layer; Based on the first bipolar plate, the second gas diffusion layer, and the second catalyst layer, a first fuel cell stack is obtained to eliminate the problem of uneven power generation during the operation of the fuel cell stack.

[0006] In the above scheme, by designing and processing the original bipolar plate based on a preset first number of segments, a first bipolar plate with a gradient porosity can be obtained, which can adapt to the gas supply gradient during fuel cell stack operation. Then, by coating the original gas diffusion layer with a preset second number of segments and a pre-configured first slurry, a first gas diffusion layer with a gradient porosity can be obtained, which can adapt to the temperature gradient during fuel cell stack operation. Next, by impregnating the first gas diffusion layer with a preset concentration emulsion and extruding the second initial gas diffusion layer, a second gas diffusion layer with a gradient water contact angle can be obtained, which can adapt to the humidity gradient during fuel cell stack operation. Subsequently, by adjusting the original catalyst layer with a preset catalyst layer thickness and preset catalyst content, a first catalyst layer with a gradient catalyst content can be obtained, thereby matching the reactant gas concentration gradient in the fuel cell stack. Furthermore, by coating the first catalyst layer with a preset third number of segments, a pre-configured second slurry, and a pre-configured third slurry, a second catalyst layer with gradient permeability and gradient hydrophilicity / hydrophobicity can be obtained, further optimizing power generation characteristics. Finally, by assembling the first bipolar plate, the second gas diffusion layer, and the second catalyst layer into the first fuel cell stack, the problem of uneven power generation during stack operation can be eliminated, the performance output of the fuel cell stack can be improved, and the efficient use of the fuel cell stack can be achieved.

[0007] Further, the step of obtaining the first bipolar plate based on a preset first number of segments and the original bipolar plate includes: The original bipolar plate is divided based on the preset first segment number to obtain several bipolar plate segments; Based on any bipolar plate segment and the original bipolar plate inlet, obtain the distance between the bipolar plate segment and the original bipolar plate inlet; Based on the distance of the bipolar plate segment from the original bipolar plate inlet and the preset opening ratio, the width of the flow field ridge corresponding to the bipolar plate segment and the width of the flow field groove corresponding to the bipolar plate segment are adjusted to obtain the first bipolar plate segment. The first bipolar plate is obtained based on several segments of the first bipolar plate.

[0008] In the above scheme, the original bipolar plate is divided into several segments by a preset first segment number, laying the segmented foundation for subsequent gradient adjustment of the bipolar plate aperture ratio and ensuring that the gradient design can be implemented precisely segment by segment. Next, based on any bipolar plate segment and the original bipolar plate inlet, the distance between the bipolar plate segment and the original bipolar plate inlet is determined, providing a positional reference for subsequent position-based matching of the aperture ratio gradient and ensuring the correspondence between aperture ratio changes and bipolar plate gas transport requirements. Subsequently, using the distance between the bipolar plate segment and the original bipolar plate inlet and the preset aperture ratio, the width of the flow field ridge and the width of the flow field groove corresponding to the bipolar plate segment are adjusted to obtain the first bipolar plate segment, achieving precise control of the aperture ratio of each bipolar plate segment to adapt to the gas concentration gradient. Finally, by integrating several first bipolar plates in segments, a first bipolar plate is obtained, which gives the bipolar plate an overall gradient opening ratio from the inlet to the outlet, meeting the gas supply needs of different locations in the fuel cell stack during operation and providing a gas supply basis for improving power generation uniformity.

[0009] Further, the process of coating the original gas diffusion layer with a pre-set second number of segments and a pre-configured first slurry to obtain a first gas diffusion layer includes: Based on the preset second segment number, the original gas diffusion layer is divided to obtain several gas diffusion segments; Based on any gas diffusion section and a pre-prepared first slurry, the gas diffusion section is coated to obtain a first gas diffusion section; A first gas diffusion layer is obtained based on several first gas diffusion sections.

[0010] In the above scheme, the original gas diffusion layer is divided into several gas diffusion segments by pre-setting a second segment number. This segmentation provides a basis for subsequent differentiated coating at different locations of the gas diffusion layer, ensuring that gradient characteristics can be accurately achieved segment by segment. Next, based on any gas diffusion segment and a pre-configured first slurry, the gas diffusion segment is coated to obtain a first gas diffusion segment. This gives each gas diffusion layer a porosity suitable for its location, laying the foundation for subsequent mass transfer characteristic optimization. Then, by integrating several first gas diffusion segments, a first gas diffusion layer is obtained, enabling the gas diffusion layer as a whole to form a gradient porosity from inlet to outlet, matching the gas supply characteristics of the bipolar plates and providing structural support for uniform mass transfer in the fuel cell stack.

[0011] Further, the step of impregnating the first gas diffusion layer with an emulsion of a preset concentration to obtain a second initial gas diffusion layer, and then extruding the second initial gas diffusion layer to obtain a second gas diffusion layer, includes: A second initial gas diffusion layer is obtained by impregnating the first gas diffusion layer with an emulsion of a preset concentration. Based on the preset roller spacing and the preset gas diffusion layer conveyor speed, the second initial gas diffusion layer is extruded to obtain the second gas diffusion layer.

[0012] In the above scheme, a second initial gas diffusion layer is obtained by impregnating the first gas diffusion layer with an emulsion of a preset concentration. This allows the gas diffusion layer to fully adsorb the emulsion, providing a basis for subsequent adjustment of the hydrophilicity / hydrophobicity gradient of the gas diffusion layer and ensuring uniform application to the substrate. Subsequently, the second initial gas diffusion layer is extruded by a preset roller spacing and a preset gas diffusion layer conveyor speed to obtain the second gas diffusion layer. This allows for precise control of the emulsion residue at different locations, achieving a gradient change in the water contact angle of the gas diffusion layer from the inlet to the outlet, resulting in a second gas diffusion layer with a gradient water contact angle, which can adapt to the gradient changes in operating humidity during fuel cell stack operation.

[0013] Further, the first catalyst layer is coated based on a preset third segment number, a pre-configured second slurry, and a pre-configured third slurry to obtain a second catalyst layer; specifically: Based on the preset third segmentation number, the first catalytic layer is divided to obtain several catalytic segments; Based on any catalytic segment, a pre-prepared second slurry, and a pre-prepared third slurry, the catalytic segment is coated to obtain a first catalytic segment; Based on several first catalytic segments, a second catalytic layer is obtained.

[0014] In the above scheme, the first catalyst layer is divided into several catalyst segments by pre-setting a third segment number. This segmentation provides a basis for subsequent differentiated coating of different locations on the catalyst layer, ensuring that the power generation characteristics of the catalyst layer, such as permeability and hydrophilicity / hydrophobicity, can be precisely adjusted segment by segment. Next, based on any catalyst segment, a pre-configured second slurry, and a pre-configured third slurry, the catalyst segment is coated to obtain the first catalyst segment. This ensures that each catalyst segment has permeability and hydrophilicity / hydrophobicity suitable for its location, thereby matching the reaction requirements of the fuel cell stack. Finally, several first catalyst segments are integrated to obtain the second catalyst layer. This creates a permeability and hydrophilicity / hydrophobicity gradient from the inlet to the outlet of the entire catalyst layer, optimizing electrochemical reaction efficiency and providing core power generation component support for uniform power generation in the fuel cell stack.

[0015] This invention provides a fuel cell stack fabrication system, comprising a raw stack acquisition module, a bipolar plate fabrication module, a first gas diffusion layer fabrication module, a second gas diffusion layer fabrication module, a first catalyst layer fabrication module, a second catalyst layer fabrication module, and a stack assembly module, specifically: The original fuel cell stack acquisition module is used to acquire the original fuel cell stack; wherein, the original fuel cell stack includes the original bipolar plate, the original gas diffusion layer and the original catalyst layer; The bipolar plate preparation module is used to obtain a first bipolar plate based on a preset first number of segments and an original bipolar plate; The first gas diffusion layer preparation module is used to coat the original gas diffusion layer based on a preset second number of segments and a pre-configured first slurry to obtain the first gas diffusion layer; The second gas diffusion layer preparation module is used to impregnate the first gas diffusion layer with an emulsion of a preset concentration to obtain a second initial gas diffusion layer, and to extrude the second initial gas diffusion layer to obtain a second gas diffusion layer. The first catalyst layer preparation module is used to adjust the original catalyst layer based on a preset catalyst layer thickness and a preset catalyst content to obtain the first catalyst layer; The second catalyst layer preparation module is used to coat the first catalyst layer based on a preset third segment number, a pre-configured second slurry, and a pre-configured third slurry to obtain the second catalyst layer; The fuel cell stack assembly module is used to obtain a first fuel cell stack based on a first bipolar plate, a second gas diffusion layer, and a second catalyst layer, so as to eliminate the problem of uneven power generation during the operation of the fuel cell stack.

[0016] This invention provides a fuel cell stack fabrication system. In practical applications, it only requires a bipolar plate fabrication module. By designing and processing the original bipolar plate based on a preset first number of segments, a first bipolar plate with a gradient porosity can be obtained, which can adapt to the gas supply gradient during fuel cell stack operation. Then, a first gas diffusion layer fabrication module is used to coat the original gas diffusion layer with a preset second number of segments and a pre-configured first slurry, resulting in a first gas diffusion layer with a gradient porosity, which can adapt to the temperature gradient changes during fuel cell stack operation. Then, using a second gas diffusion layer preparation module, the first gas diffusion layer is impregnated with a pre-concentrated emulsion, and the second initial gas diffusion layer is extruded to obtain a second gas diffusion layer with a gradient water contact angle, which can adapt to the gradient changes in operating humidity during fuel cell stack operation. Subsequently, using a first catalyst layer preparation module, the original catalyst layer is adjusted by pre-concentrating the catalyst layer thickness and catalyst content to obtain a first catalyst layer with a gradient catalyst content, thereby matching the reaction gas concentration gradient in the fuel cell stack. Further using a second catalyst layer preparation module, the first catalyst layer is coated with a pre-concentrated third slurry, a pre-configured third slurry, and a pre-configured third slurry to obtain a second catalyst layer with gradient permeability and gradient hydrophobicity, further optimizing power generation characteristics. Finally, using a stack assembly module, the first bipolar plate, the second gas diffusion layer, and the second catalyst layer are assembled into a first fuel cell stack, which can eliminate the problem of uneven power generation during stack operation, improve the performance output of the fuel cell stack, and ultimately achieve efficient use of the fuel cell stack.

[0017] Furthermore, the bipolar plate fabrication module is used to obtain a first bipolar plate based on a preset first number of segments and the original bipolar plate; including: The original bipolar plate is divided based on the preset first segment number to obtain several bipolar plate segments; Based on any bipolar plate segment and the original bipolar plate inlet, obtain the distance between the bipolar plate segment and the original bipolar plate inlet; Based on the distance of the bipolar plate segment from the original bipolar plate inlet and the preset opening ratio, the width of the flow field ridge corresponding to the bipolar plate segment and the width of the flow field groove corresponding to the bipolar plate segment are adjusted to obtain the first bipolar plate segment. The first bipolar plate is obtained based on several segments of the first bipolar plate.

[0018] In the above scheme, the original bipolar plate is divided into several segments by a preset first segment number, laying the segmented foundation for subsequent gradient adjustment of the bipolar plate aperture ratio and ensuring that the gradient design can be implemented precisely segment by segment. Next, based on any bipolar plate segment and the original bipolar plate inlet, the distance between the bipolar plate segment and the original bipolar plate inlet is determined, providing a positional reference for subsequent position-based matching of the aperture ratio gradient and ensuring the correspondence between aperture ratio changes and bipolar plate gas transport requirements. Subsequently, using the distance between the bipolar plate segment and the original bipolar plate inlet and the preset aperture ratio, the width of the flow field ridge and the width of the flow field groove corresponding to the bipolar plate segment are adjusted to obtain the first bipolar plate segment, achieving precise control of the aperture ratio of each bipolar plate segment to adapt to the gas concentration gradient. Finally, by integrating several first bipolar plates in segments, a first bipolar plate is obtained, which gives the bipolar plate an overall gradient opening ratio from the inlet to the outlet, meeting the gas supply needs of different locations in the fuel cell stack during operation and providing a gas supply basis for improving power generation uniformity.

[0019] Further, the first gas diffusion layer preparation module is used to coat the original gas diffusion layer based on a preset second number of segments and a pre-configured first slurry to obtain the first gas diffusion layer; including: Based on the preset second segment number, the original gas diffusion layer is divided to obtain several gas diffusion segments; Based on any gas diffusion section and a pre-prepared first slurry, the gas diffusion section is coated to obtain a first gas diffusion section; A first gas diffusion layer is obtained based on several first gas diffusion sections.

[0020] In the above scheme, the original gas diffusion layer is divided into several gas diffusion segments by pre-setting a second segment number. This segmentation provides a basis for subsequent differentiated coating at different locations of the gas diffusion layer, ensuring that gradient characteristics can be accurately achieved segment by segment. Next, based on any gas diffusion segment and a pre-configured first slurry, the gas diffusion segment is coated to obtain a first gas diffusion segment. This gives each gas diffusion layer a porosity suitable for its location, laying the foundation for subsequent mass transfer characteristic optimization. Then, by integrating several first gas diffusion segments, a first gas diffusion layer is obtained, enabling the gas diffusion layer as a whole to form a gradient porosity from inlet to outlet, matching the gas supply characteristics of the bipolar plates and providing structural support for uniform mass transfer in the fuel cell stack.

[0021] Further, the second gas diffusion layer preparation module is used to impregnate the first gas diffusion layer with an emulsion of a preset concentration to obtain a second initial gas diffusion layer, and to extrude the second initial gas diffusion layer to obtain a second gas diffusion layer; including: A second initial gas diffusion layer is obtained by impregnating the first gas diffusion layer with an emulsion of a preset concentration. Based on the preset roller spacing and the preset gas diffusion layer conveyor speed, the second initial gas diffusion layer is extruded to obtain the second gas diffusion layer.

[0022] In the above scheme, a second initial gas diffusion layer is obtained by impregnating the first gas diffusion layer with an emulsion of a preset concentration. This allows the gas diffusion layer to fully adsorb the emulsion, providing a basis for subsequent adjustment of the hydrophilicity / hydrophobicity gradient of the gas diffusion layer and ensuring uniform application to the substrate. Subsequently, the second initial gas diffusion layer is extruded by a preset roller spacing and a preset gas diffusion layer conveyor speed to obtain the second gas diffusion layer. This allows for precise control of the emulsion residue at different locations, achieving a gradient change in the water contact angle of the gas diffusion layer from the inlet to the outlet, resulting in a second gas diffusion layer with a gradient water contact angle, which can adapt to the gradient changes in operating humidity during fuel cell stack operation.

[0023] The present invention provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, performs the functions of the system as described above. Attached Figure Description

[0024] Figure 1 A flowchart illustrating a method for preparing a fuel cell stack according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the gradient-varying aperture ratio of a bipolar plate according to an embodiment of the present invention; Figure 3 This is a schematic diagram of a GDL segmented coating slurry provided in an embodiment of the present invention; Figure 4This is an architectural diagram of a fuel cell stack fabrication system provided in an embodiment of the present invention. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0026] This embodiment provides a method for preparing a fuel cell stack; please refer to the flowchart for its process. Figure 1 ,include: Step S1: Obtain the original fuel cell stack; wherein the original fuel cell stack includes the original bipolar plate, the original gas diffusion layer and the original catalyst layer; Step S2: Based on the preset first segment number and the original bipolar plate, obtain the first bipolar plate; Step S3: Based on the preset second segment number and the pre-configured first slurry, coat the original gas diffusion layer to obtain the first gas diffusion layer; Step S4: Impregnate the first gas diffusion layer with an emulsion of a preset concentration to obtain a second initial gas diffusion layer, and squeeze the second initial gas diffusion layer to obtain a second gas diffusion layer; Step S5: Based on the preset catalyst layer thickness and preset catalyst content, adjust the original catalyst layer to obtain the first catalyst layer; Step S6: Based on the preset third segment number, the pre-configured second slurry, and the pre-configured third slurry, coat the first catalyst layer to obtain the second catalyst layer; Step S7: Based on the first bipolar plate, the second gas diffusion layer, and the second catalyst layer, a first fuel cell stack is obtained to eliminate the problem of uneven power generation during the operation of the fuel cell stack.

[0027] In this embodiment, the basic composition and structure of the original fuel cell stack are common in the market, including end plates, current collectors, bipolar plates (cathode and anode plates), membrane electrode assembly (MEA), and fastening components (pull rods or straps). In this embodiment, both the original gas diffusion layer and the original catalyst layer are located within the MEA. By designing and processing the original bipolar plates based on a preset first number of segments, a first bipolar plate with a gradient porosity can be obtained, which can adapt to the gas supply gradient during fuel cell stack operation. Then, by coating the original gas diffusion layer with a preset second number of segments and a pre-configured first slurry, a first gas diffusion layer with a gradient porosity can be obtained, which can adapt to the temperature gradient changes during fuel cell stack operation. Then, by impregnating the first gas diffusion layer with a pre-set concentration emulsion and extruding the second initial gas diffusion layer, a second gas diffusion layer with a gradient water contact angle can be obtained, which can adapt to the gradient changes in operating humidity during fuel cell stack operation. Subsequently, the original catalyst layer is adjusted by pre-set catalyst layer thickness and pre-set catalyst content. This can be achieved using any of the following methods: 1. Adjusting the original catalyst layer by adjusting the thickness between the roller or scraper and the proton exchange membrane: Adjusting the distance between the roller or scraper and the proton exchange membrane, while simultaneously adjusting the proton exchange membrane's travel time, ensures that the catalyst content of the first catalyst layer on the proton exchange membrane meets the pre-set requirements. 2. Using a catalyst layer spraying process, a single original catalyst layer contains multiple nozzles. Each nozzle sprays a certain width of catalyst, and each nozzle contains a catalyst slurry with a different pre-set catalyst content depending on the different pre-set catalyst layer thicknesses. Because the gradient catalyst produced by the coating method can achieve continuous changes in catalyst content, a first catalyst layer with a gradient catalyst content is obtained, matching the reaction gas concentration gradient in the fuel cell stack. The catalyst content angle u at the inlet end of the first catalyst layer is 0-1 (mg / cm²). 2 The catalyst content i at the outlet of the first catalyst layer is 1-0 (mg / cm³). 2 The variation pattern of catalyst content throughout the first catalyst layer. , This represents the ratio of the length of the first catalytic segment from the inlet of the first catalytic layer to the total length of the second catalytic layer. The location of the catalyst in the first catalyst layer to be calculated is shown. Furthermore, by pre-setting the third segment number, pre-configuring the second slurry, and pre-configuring the third slurry to coat the first catalyst layer, a second catalyst layer with gradient permeability and gradient hydrophilicity / hydrophobicity can be obtained, further optimizing power generation characteristics. Finally, by assembling the first bipolar plate, the second gas diffusion layer, and the second catalyst layer into a first fuel cell stack, the problem of localized rapid degradation of the fuel cell caused by uneven power generation during stack operation can be eliminated or mitigated. Simultaneously, because power generation is more uniform across the active area of ​​the stack, the output performance of the stack is higher under the same current load, thereby improving the performance output of the fuel cell stack and ultimately achieving efficient use of the fuel cell stack.

[0028] Further, the step of obtaining the first bipolar plate based on a preset first number of segments and the original bipolar plate includes: The original bipolar plate is divided based on the preset first segment number to obtain several bipolar plate segments; Based on any bipolar plate segment and the original bipolar plate inlet, obtain the distance between the bipolar plate segment and the original bipolar plate inlet; Based on the distance of the bipolar plate segment from the original bipolar plate inlet and the preset opening ratio, the width of the flow field ridge corresponding to the bipolar plate segment and the width of the flow field groove corresponding to the bipolar plate segment are adjusted to obtain the first bipolar plate segment. The first bipolar plate is obtained based on several segments of the first bipolar plate.

[0029] In this embodiment, the original bipolar plate is divided into several bipolar plate segments (n segments, n≥2) by a preset first segment number. This segmentation lays the foundation for the subsequent gradient adjustment of the bipolar plate aperture ratio, ensuring that the gradient design can be implemented accurately segment by segment. Next, based on any bipolar plate segment and the original bipolar plate inlet, the distance between the bipolar plate segment and the original bipolar plate inlet is determined. This provides a positional reference for subsequent position-based matching of the aperture ratio gradient, ensuring the correspondence between the aperture ratio change and the bipolar plate gas transmission requirements. Subsequently, based on the distance between the bipolar plate segment and the original bipolar plate inlet and the preset aperture ratio, the width of the flow field ridge and the width of the flow field groove corresponding to the bipolar plate segment are adjusted to obtain the first bipolar plate segment. Specifically, each bipolar plate segment is divided into N segments (flow field length is L) along the flow field direction. The length of each flow field segment can be equal, i.e., the length of each segment is L / N. Preferably, the flow field segments within each bipolar plate segment are of equal length, and the length of each flow field segment gradually decreases along the flow field direction: the length of the flow field segment in the x-th bipolar plate segment is k times the length of the flow field segment in the (x-1)-th bipolar plate segment, that is... , 0.9≥k≥0.1, where x represents the x-th bipolar plate segment along the flow field; This represents the length of the flow field segment within the x-th bipolar plate segment; Let represent the length of the flow field segment within the (x-1)th bipolar plate segment; k represents the ratio of the flow field segment lengths. The opening ratio of the bipolar plate segments differs along the flow field direction, and the opening ratio of each segment maintains an increasing trend, satisfying the following condition: , 2≥m≥1.01, where, This represents the segmental opening ratio of the x-th bipolar plate. Let represent the opening ratio of the (x-1)th bipolar plate segment, and m represent the opening ratio ratio of the bipolar plate segments. The process of adjusting the ridge width and groove width of the flow field corresponding to this bipolar plate segment is essentially: while ensuring that the ridge width of the flow field in each flow field unit of each segment remains constant, the opening ratio of the bipolar plate segment is adjusted by reducing the groove width of the flow field in each flow field unit of each segment. This allows for precise control of the opening ratio of each bipolar plate segment, adapting to the gas concentration gradient. Finally, by integrating several segmented first bipolar plates, a first bipolar plate is obtained, giving the bipolar plate an overall gradient opening ratio from inlet to outlet (meaning the opening ratio of the cathode (or anode) of the bipolar plate changes gradually from the inlet to the outlet, conforming to a piecewise linear variation law. Opening ratio: cross-sectional area of ​​the flow channel of a flow field unit / cross-sectional area of ​​the flow channel of that flow field unit + cross-sectional area of ​​the flow field ridge of that flow field unit), where the opening ratio 'a' at the inlet is 0%-95%, and the opening ratio 'b' at the outlet is 95%-0%. For example... Figure 2 As shown, the porosity variation law of the bipolar plate is as follows: X represents the number of segments of the first bipolar plate from the bipolar plate inlet, and Y represents the bipolar plate opening ratio. The obtained first bipolar plate can meet the gas supply requirements at different locations of the fuel cell stack during operation, providing a gas supply basis for improving power generation uniformity.

[0030] Further, the process of coating the original gas diffusion layer with a pre-set second number of segments and a pre-configured first slurry to obtain a first gas diffusion layer includes: Based on the preset second segment number, the original gas diffusion layer is divided to obtain several gas diffusion segments; Based on any gas diffusion section and a pre-prepared first slurry, the gas diffusion section is coated to obtain a first gas diffusion section; A first gas diffusion layer is obtained based on several first gas diffusion sections.

[0031] In this embodiment, the original gas diffusion layer (GDL) is divided into several gas diffusion segments by a preset second segment number. The process involves dividing the gas diffusion layer into segments (M segments) to provide a basis for subsequent differentiated coating at different locations, ensuring that the gradient characteristics can be accurately achieved segment by segment. Next, based on any given gas diffusion segment and a pre-prepared first slurry, the gas diffusion segment is coated to obtain the first gas diffusion segment. Specifically, the gradient permeability structure of the gas diffusion layer (GDL) is achieved on the microporous layer (MPL) layer in the fuel cell. This involves segmenting the GDL substrate with MPL slurries of different densities, dividing the original gas diffusion layer from its inlet to its outlet into M segments, each segment occupying a specific area. Where S is the length of the original gas diffusion layer, and according to the gradient porosity requirements of the original gas diffusion layer after the slurry is dried, pre-configured first slurry (i.e., MPL slurry) of different densities is prepared. The density of the pre-configured first slurry coated on each gas diffusion section is different: for example... Figure 3 As shown, if the density of the slurry coated in the first section is... After the first coating is completed, it is dried and cured at high temperature. The porosity after drying is... The density of the slurry coated in the second stage is After the second coating is completed, it is dried and cured at high temperature, and its porosity after drying is... Prepare the first one in the same way The porosity of the gas diffusion section is This achieves a gradient change in porosity from the inlet to the outlet of the gas diffusion section while maintaining a constant overall thickness. This provides each gas diffusion layer with a porosity base suitable for its location, laying the foundation for subsequent mass transfer characteristic optimization. Next, by integrating several first gas diffusion sections, a first gas diffusion layer is obtained. This first gas diffusion layer forms a gradient porosity and gradient permeability from the inlet to the outlet, matching the gas supply characteristics of the bipolar plate and providing structural support for uniform mass transfer in the fuel cell stack. The permeability d at the inlet of the first gas diffusion layer is 0%-95%, and the permeability f at the outlet is 95%-0%. The permeability variation pattern of the entire bipolar plate is described below. W represents the ratio of the length of the gas diffusion section to be calculated from the inlet of the first gas diffusion layer to the total length of the first gas diffusion layer, and Q represents the location of the gas diffusion section whose permeability is to be calculated. The porosity g at the inlet end of the first gas diffusion layer is 0%-95%, and the porosity h at the outlet end of the first gas diffusion layer is 95%-0%. The porosity variation pattern of the entire first gas diffusion layer is described below. T is the ratio of the length of the gas diffusion section to be calculated from the inlet of the first gas diffusion layer to the total length of the first gas diffusion layer, and E is the location of the gas diffusion section for which the porosity is to be calculated.

[0032] The porosity can also be adjusted by the following method: During the hot-press curing stage, different pressures (hot-pressing pressure range of 10-200MPA) can be used to hot-press the gas diffusion layer. Higher pressure is used to make the porosity at the inlet end of the gas diffusion layer lower, and the hot-pressing pressure is gradually reduced from the inlet end to the outlet end of the gas diffusion layer, so that the porosity of the gas diffusion layer gradually increases from the inlet end to the outlet end of the GDL. This will make the size of the gas diffusion layer gradually thicken, so that the gas diffusion layer forms different compression thicknesses and thus achieves different compression ratios.

[0033] Further, the step of impregnating the first gas diffusion layer with an emulsion of a preset concentration to obtain a second initial gas diffusion layer, and then extruding the second initial gas diffusion layer to obtain a second gas diffusion layer, includes: A second initial gas diffusion layer is obtained by impregnating the first gas diffusion layer with an emulsion of a preset concentration. Based on the preset roller spacing and the preset gas diffusion layer conveyor speed, the second initial gas diffusion layer is extruded to obtain the second gas diffusion layer.

[0034] In this embodiment, a first gas diffusion layer is impregnated with a pre-concentrated emulsion (using PTFE emulsion). The impregnation rate of the first gas diffusion layer is increased to over 95% through pressurization or vacuuming, resulting in a second initial gas diffusion layer. This allows the gas diffusion layer to fully adsorb the emulsion, providing a basis for subsequent adjustment of the hydrophilicity / hydrophobicity gradient of the gas diffusion layer and ensuring uniform application to the substrate. Subsequently, the rate of change of the roller spacing is adjusted by pre-concentrated roller spacing, and the conveyor speed of the gas diffusion layer is adjusted by pre-concentrated conveyor speed. This process extrudes the second initial gas diffusion layer, squeezing out excess PTFE emulsion to obtain the second gas diffusion layer. This allows for precise control of the emulsion residue at different locations, achieving a gradient change in the water contact angle from the inlet to the outlet of the gas diffusion layer. This results in a second gas diffusion layer with a gradient water contact angle, adaptable to the gradient changes in operating humidity during fuel cell stack operation. The water contact angle j at the inlet of the second gas diffusion layer is 10%-180%, and the water contact angle k at the outlet is 180%-10%. The permeability variation pattern of the entire second gas diffusion layer is described. I is the ratio of the length of the second gas diffusion layer location to the inlet of the second gas diffusion layer to the total length of the second gas diffusion layer, and U is the location of the second gas diffusion layer whose permeability is to be calculated.

[0035] Further, the first catalyst layer is coated based on a preset third segment number, a pre-configured second slurry, and a pre-configured third slurry to obtain a second catalyst layer; specifically: Based on the preset third segmentation number, the first catalytic layer is divided to obtain several catalytic segments; Based on any catalytic segment, a pre-prepared second slurry, and a pre-prepared third slurry, the catalytic segment is coated to obtain a first catalytic segment; Based on several first catalytic segments, a second catalytic layer is obtained.

[0036] In this embodiment, by presetting the third segment number (total) The first catalyst layer is divided into several segments, providing a basis for subsequent differentiated coating of different locations within the catalyst layer. This ensures that the power generation characteristics of the catalyst layer, such as permeability and hydrophilicity / hydrophobicity, can be precisely adjusted segment by segment. Next, based on any given catalyst segment, a pre-configured second slurry, and a pre-configured third slurry, the catalyst segment is coated. Specifically, the pre-configured second slurry and pre-configured third slurry are coated onto each catalyst segment of the first catalyst layer. The pre-configured second slurry consists of catalyst slurries with different permeability, and the pre-configured third slurry consists of catalyst slurries with different hydrophilicity / hydrophobicity. On the proton exchange membrane (PEM membrane) of the first catalyst segment of the first catalyst layer, pre-configured second slurry 1 is coated. The type and type of carbon support used in pre-configured second slurry 1 determine the permeability of the corresponding catalyst segment. After coating, the material is dried, and then pre-prepared third slurry 1 is applied. The PTFE content of the pre-prepared third slurry 1 determines the hydrophilicity or hydrophobicity of the corresponding catalyst section. After coating, the membrane is dried. Then, the proton exchange membrane of the second catalytic segment of the first catalytic layer is coated with a pre-prepared second slurry 2. The type and type of carbon support used in the pre-prepared second slurry 2 determine the permeability of the corresponding catalytic segment. After coating, the material is dried, and then pre-prepared third slurry 2 is applied. The PTFE content of the pre-prepared third slurry 2 determines the hydrophilicity or hydrophobicity of the corresponding catalyst section. After coating, it is dried. This process is repeated for all catalyst sections, resulting in a final second catalyst layer with a total of [number missing] layers. The first catalyst layer consists of several sections with varying permeability and hydrophilicity / hydrophobicity, exhibiting a gradient of permeability and hydrophilicity / hydrophobicity. This ensures that each section has a permeability and hydrophilicity / hydrophobicity suited to its location, thus matching the reaction requirements of the fuel cell stack. Finally, these first catalyst sections are integrated to form a second catalyst layer. This creates a permeability and hydrophilicity / hydrophobicity gradient from the inlet to the outlet of the entire catalyst layer, optimizing electrochemical reaction efficiency and providing core power generation component support for uniform power generation in the fuel cell stack. The permeability q at the inlet of the second catalyst layer ranges from 0 to 300 μm / (Pa·s), and the permeability t at the outlet ranges from 300 to 0 μm / (Pa·s). The permeability variation pattern of the entire second catalyst layer is described below. Z represents the ratio of the length of the first catalytic segment from the inlet of the second catalytic layer to the total length of the second catalytic layer, and P represents the position of the first catalytic segment from which the permeability is calculated. The water contact angle ε at the inlet of the second catalytic layer ranges from 10% to 180%, and the water contact angle r at the outlet of the second catalytic layer ranges from 180% to 10%. The variation pattern of the water contact angle throughout the second catalytic layer is described below. , This represents the ratio of the length of the first catalytic segment from the inlet of the second catalytic layer to the total length of the second catalytic layer. The location of the first catalytic segment where the water contact angle is to be calculated.

[0037] This embodiment provides a fuel cell stack fabrication system, including a raw stack acquisition module, a bipolar plate fabrication module, a first gas diffusion layer fabrication module, a second gas diffusion layer fabrication module, a first catalyst layer fabrication module, a second catalyst layer fabrication module, and a stack assembly module, specifically: The original fuel cell stack acquisition module is used to acquire the original fuel cell stack; wherein, the original fuel cell stack includes the original bipolar plate, the original gas diffusion layer and the original catalyst layer; The bipolar plate preparation module is used to obtain a first bipolar plate based on a preset first number of segments and an original bipolar plate; The first gas diffusion layer preparation module is used to coat the original gas diffusion layer based on a preset second number of segments and a pre-configured first slurry to obtain the first gas diffusion layer; The second gas diffusion layer preparation module is used to impregnate the first gas diffusion layer with an emulsion of a preset concentration to obtain a second initial gas diffusion layer, and to extrude the second initial gas diffusion layer to obtain a second gas diffusion layer. The first catalyst layer preparation module is used to adjust the original catalyst layer based on a preset catalyst layer thickness and a preset catalyst content to obtain the first catalyst layer; The second catalyst layer preparation module is used to coat the first catalyst layer based on a preset third segment number, a pre-configured second slurry, and a pre-configured third slurry to obtain the second catalyst layer; The fuel cell stack assembly module is used to obtain a first fuel cell stack based on a first bipolar plate, a second gas diffusion layer, and a second catalyst layer, so as to eliminate the problem of uneven power generation during the operation of the fuel cell stack.

[0038] This embodiment provides a fuel cell stack fabrication system. In practical applications, it only requires a bipolar plate fabrication module. By designing and processing the original bipolar plate based on a preset first number of segments, a first bipolar plate with a gradient porosity can be obtained, which can adapt to the gas supply gradient during fuel cell stack operation. Next, a first gas diffusion layer fabrication module is used. By coating the original gas diffusion layer with a preset second number of segments and a pre-configured first slurry, a first gas diffusion layer with a gradient porosity can be obtained, which can adapt to the temperature gradient changes during fuel cell stack operation. Then, using a second gas diffusion layer preparation module, the first gas diffusion layer is impregnated with a pre-concentrated emulsion, and the second initial gas diffusion layer is extruded to obtain a second gas diffusion layer with a gradient water contact angle, which can adapt to the gradient changes in operating humidity during fuel cell stack operation. Subsequently, using a first catalyst layer preparation module, the original catalyst layer is adjusted by pre-concentrated catalyst layer thickness and pre-concentrated catalyst content. This can be achieved using any of the following methods: 1. Adjusting the original catalyst layer by adjusting the thickness between the roller or scraper and the proton exchange membrane: Adjusting the distance between the roller or scraper and the proton exchange membrane, while simultaneously adjusting the proton exchange membrane's travel time, ensures that the catalyst content of the first catalyst layer on the proton exchange membrane meets the pre-concentrated requirements. 2. Using a catalyst layer spraying production process, a single original catalyst layer contains multiple nozzles, each nozzle spraying a certain width of catalyst. Depending on the different pre-concentrated catalyst layer thicknesses, each nozzle contains a catalyst slurry with a different pre-concentrated catalyst content. Because the gradient catalyst produced by the coating method can achieve continuous changes in catalyst content, a first catalyst layer with a gradient catalyst content is obtained, matching the reactant gas concentration gradient in the fuel cell stack. The catalyst content angle u at the inlet of the first catalyst layer is 0-1 (mg / cm). 2 The catalyst content i at the outlet of the first catalyst layer is 1-0 (mg / cm³). 2 The variation pattern of catalyst content throughout the first catalyst layer. , This represents the ratio of the length of the first catalytic segment from the inlet of the first catalytic layer to the total length of the second catalytic layer. The location of the catalyst in the first catalyst layer to be calculated is shown. Further, a second catalyst layer preparation module is used. By pre-setting the third segment number, pre-configuring the second slurry, and pre-configuring the third slurry, the first catalyst layer is coated, resulting in a second catalyst layer with gradient permeability and gradient hydrophilicity / hydrophobicity, further optimizing power generation characteristics. Finally, a fuel cell stack assembly module is used. By assembling the first bipolar plate, the second gas diffusion layer, and the second catalyst layer into a first fuel cell stack, the problem of localized rapid degradation of the fuel cell caused by uneven power generation during stack operation can be eliminated or mitigated. Simultaneously, because power generation is more uniform across the active area of ​​the stack, the output performance of the stack is higher under the same current load, thereby improving the performance output of the fuel cell stack and ultimately achieving efficient use of the fuel cell stack.

[0039] Furthermore, the bipolar plate fabrication module is used to obtain a first bipolar plate based on a preset first number of segments and the original bipolar plate; including: The original bipolar plate is divided based on the preset first segment number to obtain several bipolar plate segments; Based on any bipolar plate segment and the original bipolar plate inlet, obtain the distance between the bipolar plate segment and the original bipolar plate inlet; Based on the distance of the bipolar plate segment from the original bipolar plate inlet and the preset opening ratio, the width of the flow field ridge corresponding to the bipolar plate segment and the width of the flow field groove corresponding to the bipolar plate segment are adjusted to obtain the first bipolar plate segment. The first bipolar plate is obtained based on several segments of the first bipolar plate.

[0040] In this embodiment, the original bipolar plate is divided into several bipolar plate segments (n segments, n≥2) by a preset first segment number. This segmentation lays the foundation for the subsequent gradient adjustment of the bipolar plate aperture ratio, ensuring that the gradient design can be implemented accurately segment by segment. Next, based on any bipolar plate segment and the original bipolar plate inlet, the distance between the bipolar plate segment and the original bipolar plate inlet is determined. This provides a positional reference for subsequent position-based matching of the aperture ratio gradient, ensuring the correspondence between the aperture ratio change and the bipolar plate gas transmission requirements. Subsequently, based on the distance between the bipolar plate segment and the original bipolar plate inlet and the preset aperture ratio, the width of the flow field ridge and the width of the flow field groove corresponding to the bipolar plate segment are adjusted to obtain the first bipolar plate segment. Specifically, each bipolar plate segment is divided into N segments (flow field length is L) along the flow field direction. The length of each flow field segment can be equal, i.e., the length of each segment is L / N. Preferably, the flow field segments within each bipolar plate segment are of equal length, and the length of each flow field segment gradually decreases along the flow field direction: the length of the flow field segment in the x-th bipolar plate segment is k times the length of the flow field segment in the (x-1)-th bipolar plate segment, that is... , 0.9≥k≥0.1, where x represents the x-th bipolar plate segment along the flow field; This represents the length of the flow field segment within the x-th bipolar plate segment; Let represent the length of the flow field segment within the (x-1)th bipolar plate segment; k represents the ratio of the flow field segment lengths. The opening ratio of the bipolar plate segments differs along the flow field direction, and the opening ratio of each segment maintains an increasing trend, satisfying the following condition: , 2≥m≥1.01, where, This represents the segmental opening ratio of the x-th bipolar plate. Let represent the opening ratio of the (x-1)th bipolar plate segment, and m represent the opening ratio ratio of the bipolar plate segments. The process of adjusting the ridge width and groove width of the flow field corresponding to this bipolar plate segment is essentially: while ensuring that the ridge width of the flow field in each flow field unit of each segment remains constant, the opening ratio of the bipolar plate segment is adjusted by reducing the groove width of the flow field in each flow field unit of each segment. This allows for precise control of the opening ratio of each bipolar plate segment, adapting to the gas concentration gradient. Finally, by integrating several segmented first bipolar plates, a first bipolar plate is obtained, giving the bipolar plate an overall gradient opening ratio from inlet to outlet (meaning the opening ratio of the cathode (or anode) of the bipolar plate changes gradually from the inlet to the outlet, conforming to a piecewise linear variation law. Opening ratio: cross-sectional area of ​​the flow channel of a flow field unit / cross-sectional area of ​​the flow channel of that flow field unit + cross-sectional area of ​​the flow field ridge of that flow field unit), where the opening ratio 'a' at the inlet is 0%-95%, and the opening ratio 'b' at the outlet is 95%-0%. For example... Figure 2 As shown, the porosity variation law of the bipolar plate is as follows: X represents the number of segments of the first bipolar plate from the bipolar plate inlet, and Y represents the bipolar plate opening ratio. The obtained first bipolar plate can meet the gas supply requirements at different locations of the fuel cell stack during operation, providing a gas supply basis for improving power generation uniformity.

[0041] Further, the first gas diffusion layer preparation module is used to coat the original gas diffusion layer based on a preset second number of segments and a pre-configured first slurry to obtain the first gas diffusion layer; including: Based on the preset second segment number, the original gas diffusion layer is divided to obtain several gas diffusion segments; Based on any gas diffusion section and a pre-prepared first slurry, the gas diffusion section is coated to obtain a first gas diffusion section; A first gas diffusion layer is obtained based on several first gas diffusion sections.

[0042] In this embodiment, the original gas diffusion layer (GDL) is divided into several gas diffusion segments by a preset second segment number. The process involves dividing the gas diffusion layer into segments (M segments) to provide a basis for subsequent differentiated coating at different locations, ensuring that the gradient characteristics can be accurately achieved segment by segment. Next, based on any given gas diffusion segment and a pre-prepared first slurry, the gas diffusion segment is coated to obtain the first gas diffusion segment. Specifically, the gradient permeability structure of the gas diffusion layer (GDL) is achieved on the microporous layer (MPL) layer in the fuel cell. This involves segmenting the GDL substrate with MPL slurries of different densities, dividing the original gas diffusion layer from its inlet to its outlet into M segments, each segment occupying a specific area. Where S is the length of the original gas diffusion layer, and according to the gradient porosity requirements of the original gas diffusion layer after the slurry is dried, pre-configured first slurry (i.e., MPL slurry) of different densities is prepared. The density of the pre-configured first slurry coated on each gas diffusion section is different: for example... Figure 3 As shown, if the density of the slurry coated in the first section is... After the first coating is completed, it is dried and cured at high temperature. The porosity after drying is... The density of the slurry coated in the second stage is After the second coating is completed, it is dried and cured at high temperature, and its porosity after drying is... Prepare the first one in the same way The porosity of the gas diffusion section is This achieves a gradient change in porosity from the inlet to the outlet of the gas diffusion section while maintaining a constant overall thickness. This provides each gas diffusion layer with a porosity base suitable for its location, laying the foundation for subsequent mass transfer characteristic optimization. Next, by integrating several first gas diffusion sections, a first gas diffusion layer is obtained. This first gas diffusion layer forms a gradient porosity and gradient permeability from the inlet to the outlet, matching the gas supply characteristics of the bipolar plate and providing structural support for uniform mass transfer in the fuel cell stack. The permeability d at the inlet of the first gas diffusion layer is 0%-95%, and the permeability f at the outlet is 95%-0%. The permeability variation pattern of the entire bipolar plate is described below. W represents the ratio of the length of the gas diffusion section to be calculated from the inlet of the first gas diffusion layer to the total length of the first gas diffusion layer, and Q represents the location of the gas diffusion section whose permeability is to be calculated. The porosity g at the inlet end of the first gas diffusion layer is 0%-95%, and the porosity h at the outlet end of the first gas diffusion layer is 95%-0%. The porosity variation pattern of the entire first gas diffusion layer is described below. T is the ratio of the length of the gas diffusion section to be calculated from the inlet of the first gas diffusion layer to the total length of the first gas diffusion layer, and E is the location of the gas diffusion section for which the porosity is to be calculated.

[0043] Further, the second gas diffusion layer preparation module is used to impregnate the first gas diffusion layer with an emulsion of a preset concentration to obtain a second initial gas diffusion layer, and to extrude the second initial gas diffusion layer to obtain a second gas diffusion layer; including: A second initial gas diffusion layer is obtained by impregnating the first gas diffusion layer with an emulsion of a preset concentration. Based on the preset roller spacing and the preset gas diffusion layer conveyor speed, the second initial gas diffusion layer is extruded to obtain the second gas diffusion layer.

[0044] In this embodiment, a first gas diffusion layer is impregnated with a pre-concentrated emulsion (using PTFE emulsion). The impregnation rate of the first gas diffusion layer is increased to over 95% through pressurization or vacuuming, resulting in a second initial gas diffusion layer. This allows the gas diffusion layer to fully adsorb the emulsion, providing a basis for subsequent adjustment of the hydrophilicity / hydrophobicity gradient of the gas diffusion layer and ensuring uniform application to the substrate. Subsequently, the rate of change of the roller spacing is adjusted by pre-concentrated roller spacing, and the conveyor speed of the gas diffusion layer is adjusted by pre-concentrated conveyor speed. This process extrudes the second initial gas diffusion layer, squeezing out excess PTFE emulsion to obtain the second gas diffusion layer. This allows for precise control of the emulsion residue at different locations, achieving a gradient change in the water contact angle from the inlet to the outlet of the gas diffusion layer. This results in a second gas diffusion layer with a gradient water contact angle, adaptable to the gradient changes in operating humidity during fuel cell stack operation. The water contact angle j at the inlet of the second gas diffusion layer is 10%-180%, and the water contact angle k at the outlet is 180%-10%. The permeability variation pattern of the entire second gas diffusion layer is described. I is the ratio of the length of the second gas diffusion layer location to the inlet of the second gas diffusion layer to the total length of the second gas diffusion layer, and U is the location of the second gas diffusion layer whose permeability is to be calculated.

[0045] This embodiment provides a non-transitory computer-readable storage medium on which a computer program is stored, which, when executed by a processor, implements the functions of the system as described above.

[0046] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for preparing a fuel cell stack, characterized in that, include: Obtain a raw fuel cell stack; wherein the raw fuel cell stack includes a raw bipolar plate, a raw gas diffusion layer, and a raw catalyst layer; Based on the preset first segment number and the original bipolar plate, obtain the first bipolar plate; Based on the preset second segment number and the pre-configured first slurry, the original gas diffusion layer is coated to obtain the first gas diffusion layer; The first gas diffusion layer is impregnated with an emulsion of a preset concentration to obtain a second initial gas diffusion layer, and the second initial gas diffusion layer is squeezed to obtain a second gas diffusion layer. Based on the preset catalyst layer thickness and preset catalyst content, the original catalyst layer is adjusted to obtain the first catalyst layer; Based on the preset third segment number, the pre-configured second slurry and the pre-configured third slurry, the first catalyst layer is coated to obtain the second catalyst layer; Based on the first bipolar plate, the second gas diffusion layer, and the second catalyst layer, a first fuel cell stack is obtained to eliminate the problem of uneven power generation during the operation of the fuel cell stack.

2. The method for preparing a fuel cell stack according to claim 1, characterized in that, The process of obtaining the first bipolar plate based on a preset first segmentation number and the original bipolar plate includes: The original bipolar plate is divided based on the preset first segment number to obtain several bipolar plate segments; Based on any bipolar plate segment and the original bipolar plate inlet, obtain the distance between the bipolar plate segment and the original bipolar plate inlet; Based on the distance of the bipolar plate segment from the original bipolar plate inlet and the preset opening ratio, the width of the flow field ridge corresponding to the bipolar plate segment and the width of the flow field groove corresponding to the bipolar plate segment are adjusted to obtain the first bipolar plate segment. The first bipolar plate is obtained based on several segments of the first bipolar plate.

3. The method for preparing a fuel cell stack according to claim 1, characterized in that, The process of coating the original gas diffusion layer with a pre-set second segment number and a pre-configured first slurry to obtain a first gas diffusion layer includes: Based on the preset second segment number, the original gas diffusion layer is divided to obtain several gas diffusion segments; Based on any gas diffusion section and a pre-prepared first slurry, the gas diffusion section is coated to obtain a first gas diffusion section; A first gas diffusion layer is obtained based on several first gas diffusion sections.

4. The method for preparing a fuel cell stack according to claim 1, characterized in that, The process involves impregnating a first gas diffusion layer with an emulsion of a preset concentration to obtain a second initial gas diffusion layer, and then extruding the second initial gas diffusion layer to obtain a second gas diffusion layer; including: A second initial gas diffusion layer is obtained by impregnating the first gas diffusion layer with an emulsion of a preset concentration. Based on the preset roller spacing and the preset gas diffusion layer conveyor speed, the second initial gas diffusion layer is extruded to obtain the second gas diffusion layer.

5. The method for preparing a fuel cell stack according to claim 1, characterized in that, The first catalyst layer is coated with a second catalyst layer based on a preset third segment number, a pre-configured second slurry, and a pre-configured third slurry; specifically: Based on the preset third segmentation number, the first catalytic layer is divided to obtain several catalytic segments; Based on any catalytic segment, a pre-prepared second slurry, and a pre-prepared third slurry, the catalytic segment is coated to obtain a first catalytic segment; Based on several first catalytic segments, a second catalytic layer is obtained.

6. A system for fabricating a fuel cell stack, characterized in that, It includes a raw fuel cell stack acquisition module, a bipolar plate preparation module, a first gas diffusion layer preparation module, a second gas diffusion layer preparation module, a first catalyst layer preparation module, a second catalyst layer preparation module, and a fuel cell stack assembly module, specifically: The original fuel cell stack acquisition module is used to acquire the original fuel cell stack; wherein, the original fuel cell stack includes the original bipolar plate, the original gas diffusion layer and the original catalyst layer; The bipolar plate preparation module is used to obtain a first bipolar plate based on a preset first number of segments and an original bipolar plate; The first gas diffusion layer preparation module is used to coat the original gas diffusion layer based on a preset second number of segments and a pre-configured first slurry to obtain the first gas diffusion layer; The second gas diffusion layer preparation module is used to impregnate the first gas diffusion layer with an emulsion of a preset concentration to obtain a second initial gas diffusion layer, and to extrude the second initial gas diffusion layer to obtain a second gas diffusion layer. The first catalyst layer preparation module is used to adjust the original catalyst layer based on a preset catalyst layer thickness and a preset catalyst content to obtain the first catalyst layer; The second catalyst layer preparation module is used to coat the first catalyst layer based on a preset third segment number, a pre-configured second slurry, and a pre-configured third slurry to obtain the second catalyst layer; The fuel cell stack assembly module is used to obtain a first fuel cell stack based on a first bipolar plate, a second gas diffusion layer, and a second catalyst layer, so as to eliminate the problem of uneven power generation during the operation of the fuel cell stack.

7. The fuel cell stack fabrication system according to claim 6, characterized in that, The bipolar plate fabrication module is used to obtain a first bipolar plate based on a preset first number of segments and an original bipolar plate; it includes: The original bipolar plate is divided based on the preset first segment number to obtain several bipolar plate segments; Based on any bipolar plate segment and the original bipolar plate inlet, obtain the distance between the bipolar plate segment and the original bipolar plate inlet; Based on the distance of the bipolar plate segment from the original bipolar plate inlet and the preset opening ratio, the width of the flow field ridge corresponding to the bipolar plate segment and the width of the flow field groove corresponding to the bipolar plate segment are adjusted to obtain the first bipolar plate segment. The first bipolar plate is obtained based on several segments of the first bipolar plate.

8. The fuel cell stack fabrication system according to claim 6, characterized in that, The first gas diffusion layer preparation module is used to coat the original gas diffusion layer based on a preset second number of segments and a pre-configured first slurry to obtain the first gas diffusion layer; it includes: Based on the preset second segment number, the original gas diffusion layer is divided to obtain several gas diffusion segments; Based on any gas diffusion section and a pre-prepared first slurry, the gas diffusion section is coated to obtain a first gas diffusion section; A first gas diffusion layer is obtained based on several first gas diffusion sections.

9. The fuel cell stack fabrication system according to claim 6, characterized in that, The second gas diffusion layer preparation module is used to impregnate the first gas diffusion layer with an emulsion of a preset concentration to obtain a second initial gas diffusion layer, and to extrude the second initial gas diffusion layer to obtain a second gas diffusion layer; including: A second initial gas diffusion layer is obtained by impregnating the first gas diffusion layer with an emulsion of a preset concentration. Based on the preset roller spacing and the preset gas diffusion layer conveyor speed, the second initial gas diffusion layer is extruded to obtain the second gas diffusion layer.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it performs the functions of the system as described in any one of claims 6 to 9.

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