Integrated glue injection sealing fuel cell single cell structure, cell stack, glue injection mold and manufacturing process

Abstract

This invention relates to an integrated glue-sealed fuel cell single-cell structure, manufacturing process, and stack. The integrated glue-sealed fuel cell single-cell structure includes an anode plate, a membrane electrode assembly (MEA), and a cathode plate stacked sequentially along the same direction to form a single-cell frame structure. Multiple glue injection holes are provided on the single-cell frame structure. Sealant is injected through these holes to form a sealing structure, which seals the single-cell frame structure together to form the integrated glue-sealed fuel cell single-cell structure. This application achieves a single-cell structure through a one-time glue injection and integrated sealing connection, effectively improving the sealing performance and production efficiency of the single cell, simplifying the assembly process, and reducing the production cost, thus meeting the needs of mass production of single cells. Furthermore, the integrated sealing structure reduces the ratio of the sealing area to the electrode plate area, thereby increasing the effective reaction area ratio of the single cell.

Description

Technical Field

[0001] This invention relates to the field of automotive fuel cell technology, specifically to an integrated glue-sealed fuel cell single cell structure, fuel cell stack, glue-sealing mold, and manufacturing process. Background Technology

[0002] A fuel cell is a power generation device that directly converts the chemical energy of fuel and oxidant into electrical energy through an electrochemical reaction. A hydrogen fuel cell includes components such as anode plates, cathode plates, and membrane electrode assemblies, as well as sealed elements that provide specific areas for the electrochemical reaction of the primary gas, secondary gas, and coolant to generate electricity. Automotive fuel cells typically require hundreds of cells connected in series to provide sufficient voltage. Traditional fuel cell stacks are constructed by alternately stacking and pressing bipolar plate assemblies and membrane electrode assemblies.

[0003] Currently, bipolar plate assemblies are assembled from cathode and anode plates via laser welding. However, during the welding process, defects such as weld penetration, ablation, weld spatter, incomplete welding, and porosity are prone to occur on the cathode and anode plates, leading to product scrap. Simultaneously, the coatings on the cathode and anode plates inevitably suffer damage, affecting product quality. Furthermore, welded bipolar plates may exhibit defects such as warping, poor fit, or misalignment, affecting sealing performance. Traditional sealing methods primarily utilize the bipolar plate and membrane electrode assembly to form a contact seal, including two methods: bipolar plate bonding to form a sealing ring and bipolar plate adhesive sealing. The bipolar plate bonding to form a sealing ring is problematic because the formed sealing ring material is relatively soft, making it difficult to position during bonding. The sealing ring is very thin, and inconsistent adhesive thickness and tightness can lead to seal failure. Moreover, this bipolar plate bonding to form a sealing ring process has low production efficiency. Bipolar plate dispensing sealing mainly involves bonding the sealing material onto the bipolar plate using a dispensing machine. To ensure the uniformity of the dispensing seal thickness, it is necessary to conduct thorough experimental verification of the process parameters at the starting point, ending point, and joint of the seal. Furthermore, custom-made tooling fixtures are required to position the bipolar plate. In addition, a long curing time is required after dispensing, which seriously affects production efficiency.

[0004] To address the aforementioned technical problems, existing solutions are as follows: Existing technology one assembles the anode plate, cathode plate, and membrane electrode assembly into a single-cell assembly by bonding. While this avoids welding defects and coating damage caused by laser welding of bipolar plates, prevents contamination of the anode and cathode flow fields, and improves stack assembly efficiency, the molten bonding section requires heating and then cooling for curing. Furthermore, the anode plate and membrane electrode assembly, the cathode plate and membrane electrode assembly, and the water cavity sealing ring on the cathode plate all require heating and cooling. The single-cell structure needs to undergo three heating-cooling cycles. Due to the high heating temperature and repeated heating, the membrane electrode reaction area is easily damaged, leading to warping of the single-cell assembly. In addition, the bonding method used in existing technology one is cumbersome, has a long curing time, and low production efficiency. Existing technology two uses an integrated adhesive injection process to form a sealing ring for the single-cell structure. While this solution solves the problem of cumbersome dispensing or bonding processes and improves single-cell production efficiency... However, this scheme uses an outer layer seal and a common pipeline island seal, which easily leads to the formation of purge blind zones in the cathode and anode cavities, making it difficult for the water generated in the reaction to be discharged. When the ambient temperature is below 0 degrees Celsius, freezing can cause blockage of the flow channel or volume expansion, resulting in seal failure. Secondly, the sealing area of ​​this scheme is relatively large, resulting in a low volumetric power density of the fuel cell. In addition, the water cavity seal in the existing technology 2 scheme uses a contact compression seal. Since both sides of the water cavity seal are elastic elements, it is easy for the seal to fail due to assembly or processing errors.

[0005] Therefore, there is a need to provide an integrated glue-sealed fuel cell structure to balance the sealing performance of the fuel cell, production and assembly efficiency, and reduce production costs while meeting the needs of mass production, thereby solving the above problems. Summary of the Invention

[0006] One objective of this invention is to provide an integrated glue-sealed fuel cell single-cell structure to solve the problems of low sealing performance, low production and assembly efficiency, high production cost, and inability to meet the needs of mass production in the existing fuel cell single-cell structure sealing elements. A second objective is to provide an integrated glue-sealed fuel cell single-cell structure stack. A third objective is to provide a glue-injection mold. A fourth objective is to provide a manufacturing process for the integrated glue-sealed fuel cell single-cell structure.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] An integrated glue-sealed fuel cell single cell structure includes: an anode plate, a membrane electrode assembly (MEA), and a cathode plate, wherein the anode plate, the MEA, and the cathode plate are stacked sequentially along the same direction to form a single cell frame structure;

[0009] A flow field region is located in the middle of the single cell frame structure, and the flow field region includes an anode flow field, a cathode flow field, and a cooling water flow field.

[0010] A border area is provided on the single-cell frame structure surrounding the flow field area, and the border area is provided with a first gas common channel, a second gas common channel and a cooling water common channel;

[0011] A sealing region is disposed on the single cell frame structure. The sealing region includes an anode sealing region, a cathode sealing region, and a water cavity sealing region. The anode sealing region has a first notch located at the first gas common channel, which is used to connect the anode flow field to the first gas common channel. The cathode sealing region has a second notch located at the second gas common channel, which is used to connect the cathode flow field to the second gas channel. The water cavity sealing region has a third notch located at the cooling water common channel, which is used to connect the cooling water common channel to the cooling water flow field.

[0012] At least one injection channel is provided along the thickness direction of the single cell frame structure. The single cell frame structure is injected with sealant through the injection channel to form a sealing structure in the sealing area. The sealing structure is used to seal and connect the single cell frame structure to form the integrated injection-sealed fuel cell single cell structure.

[0013] According to the above technical means, the first notch opened on the anode sealing area allows the sealant to avoid forming a seal between the anode first gas channel and the anode flow field within the anode sealing area, and isolates the first gas channel from the cooling water channel and the second gas channel; the second notch opened on the cathode sealing area allows the sealant to avoid forming a seal between the cathode plate and the cathode flow field within the cathode sealing area, and isolates the second gas channel from the cooling water channel and the first gas channel; the third notch opened on the water cavity sealing area allows the sealant to avoid forming a seal between the cooling water gas channel and the cooling water flow field within the water cavity sealing area, and isolates the cooling water channel from the first gas channel and the second gas channel. This application achieves a one-time injection molding process to seal and connect the anode plate, membrane electrode assembly, and cathode plate, thereby ensuring the sealing performance of the single-cell structure while avoiding impacting its reaction efficiency. The integrated injection-molded fuel cell structure proposed in this application effectively improves the sealing performance and production efficiency of the single cell, simplifies the assembly process, and reduces the production cost of the fuel cell, thus meeting the needs of mass production. Furthermore, the integrated injection molding sealing structure effectively reduces the ratio of the sealing area to the electrode plate area, thereby increasing the effective reaction zone area ratio of the single cell and improving the volumetric power density of the fuel cell.

[0014] Optionally, the sealing structure includes an anode sealing ring, a cathode sealing ring, a water cavity sealing ring, and a sealing connecting post. The sealing connecting post is used to connect the anode sealing ring, the cathode sealing ring, and the water cavity sealing ring into a single unit. The sealing connecting post is formed within the glue injection channel.

[0015] The anode plate is sealed to the membrane electrode via the anode sealing ring, which is used to seal the anode flow field;

[0016] The cathode plate is sealed to the membrane electrode via the cathode sealing ring, which is used to seal the cathode flow field. The water cavity sealing ring is located on the side of the cathode plate away from the membrane electrode.

[0017] According to the above-mentioned technical means, sealant is injected into the injection hole of the single-cell frame structure in one step to form an anode sealing ring, a cathode sealing ring, a water cavity sealing ring, and a sealing connecting post. The sealing connecting post is formed in the injection hole of the single-cell frame structure, and the anode sealing ring, cathode sealing ring, and water cavity sealing ring are connected into one unit through the sealing connecting post. At the same time, the single-cell frame structure is sealed and connected to form an integrated single-cell structure through the sealing structure. The technical solution of this embodiment not only solves the sealing problem of fuel cells and improves the volumetric power density of fuel cells, but also improves the production efficiency of fuel cells and reduces the production cost of fuel cells.

[0018] Optionally, the anode plate has a first gas channel protrusion at the first notch, which protrudes towards the membrane electrode. The first gas channel protrusion abuts against the membrane electrode. A first connecting channel for connecting the first gas common channel with the anode flow field is opened on the side of the first gas channel protrusion facing the membrane electrode. The cathode plate has a second gas channel protrusion at the second notch, which protrudes towards the membrane electrode. The second gas channel protrusion abuts against the membrane electrode. A second connecting channel for connecting the second gas common channel with the cathode flow field is opened on the side of the second gas channel protrusion facing the membrane electrode.

[0019] According to the above technical means, the anode sealing ring can avoid the anode plate's first gas channel protrusion during the forming process by the anode plate's first gas channel protrusion; the cathode plate can avoid the cathode plate's second gas channel during the forming process by setting a cathode plate second gas channel protrusion facing the membrane electrode at the second notch.

[0020] Optionally, the anode plate includes an anode plate flow channel area and an anode plate frame surrounding the anode plate flow channel area. The anode plate frame is provided with a first anode plate gas channel, an anode plate cooling water channel, and a second anode plate gas channel. The anode plate frame is provided with an anode plate glue injection sealing groove corresponding to the anode sealing area. The first connecting channel includes a first gas duct, a first gas manifold, and an anode plate flow channel expansion area. The first gas duct is connected to the first anode plate gas channel, and the anode plate flow channel expansion area is connected to the anode plate flow channel area. The first gas manifold is located between the first gas duct and the anode plate flow channel expansion area, and the first gas manifold is used to connect the first gas duct and the anode plate flow channel expansion area.

[0021] According to the above-mentioned technical means, the first gas in the first gas channel enters the first gas manifold through the first gas duct, flows through the first gas manifold, and then flows into the anode plate flow channel area through the anode plate flow channel expansion area. The design of the first gas duct and the anode plate flow channel expansion area increases the diffusion area of ​​the first gas, allowing it to be more evenly distributed within the anode plate flow channel area. This increases the contact area between the first gas and the reaction area on the anode side of the membrane electrode, thereby improving the utilization rate of the first gas in the electrochemical reaction. Furthermore, by setting the first gas manifold between the first gas duct and the anode plate flow channel expansion area, the uniformity of the first gas distribution within the anode plate flow channel area can be effectively improved, achieving a smooth gas distribution between the first gas duct and the anode plate flow channel expansion area, thereby improving the reaction efficiency and stability of the fuel cell.

[0022] Optionally, the cathode plate includes a cathode plate flow channel area and a cathode plate frame surrounding the cathode plate flow channel area. The cathode plate frame is provided with a second cathode plate gas channel, a cathode plate cooling water channel, and a first cathode plate gas channel. A cathode plate glue injection sealing groove is provided on the cathode plate frame corresponding to the cathode sealing area. The second connecting channel includes a second gas duct, a second gas manifold, and a cathode plate flow channel expansion area. The second gas duct is connected to the second cathode plate gas channel, and the cathode plate flow channel expansion area is connected to the cathode plate flow channel area. The second gas manifold is located between the second gas duct and the cathode plate flow channel expansion area, and the second gas manifold is used to connect the second gas duct and the cathode plate flow channel expansion area.

[0023] According to the aforementioned technical means, the second gas in the second gas channel enters the second gas manifold through the second gas duct, flows through the second gas manifold, and then flows into the cathode plate flow channel area through the cathode plate flow channel expansion area. The design of the second gas duct and the cathode plate flow channel expansion area increases the diffusion area of ​​the second gas, allowing it to be more evenly distributed within the cathode plate flow channel area. This increases the contact area between the second gas and the reaction zone on the cathode side of the membrane electrode, thereby improving the utilization rate of the second gas in the electrochemical reaction. Furthermore, by setting the second gas manifold between the second gas duct and the cathode plate flow channel expansion area, the uniformity of the second gas distribution within the cathode plate flow channel area can be effectively improved, achieving a smooth gas distribution between the second gas duct and the cathode plate flow channel expansion area, thereby improving the reaction efficiency and stability of the fuel cell.

[0024] Optionally, an anode resist structure protruding towards the membrane electrode is provided between the first gas manifold and the anode plate glue injection sealing groove, and a cathode resist structure protruding towards the membrane electrode is provided between the second gas manifold and the cathode plate glue injection sealing groove.

[0025] Based on the above technical means, the design of the anode and cathode adhesive blocking structures can effectively prevent the sealant from flowing into the anode or cathode plate flow channel expansion area during the adhesive injection process in the sealing area.

[0026] Optionally, a plurality of anode plate venting holes are evenly distributed in the anode plate venting groove, and the plurality of anode plate venting holes are symmetrical about the center of the anode plate. The cathode plate is provided with cathode plate venting connection holes corresponding to the anode plate venting holes.

[0027] According to the above technical means, by injecting sealant into the bonding hole of the cathode plate, the sealant enters the sealing area of ​​the single cell frame structure. After the sealant enters the sealing area, the gas inside the sealing area is discharged through the anode plate sealant vent hole provided on the anode plate to balance the internal gas pressure, ensure the pressure balance of the sealant injection, avoid the formation of cavitation in the sealing structure, and thus improve the sealing performance of the sealing structure.

[0028] Optionally, an anode plate glue overflow groove is provided between the anode plate flow channel area and the anode plate glue injection sealing groove, and a cathode plate glue overflow groove is provided on the cathode plate corresponding to the anode plate glue overflow groove.

[0029] Based on the above technical means, the anode plate glue overflow groove set between the anode plate flow channel area and the anode plate glue injection sealing groove can effectively prevent glue overflow during glue injection in the anode plate glue injection sealing groove, thus avoiding the potential risk of contamination of the anode plate flow channel area; the cathode plate glue overflow groove set between the cathode plate flow channel area and the cathode plate glue injection sealing groove can effectively prevent the potential risk of sealant overflow in the cathode plate glue injection sealing groove, thus avoiding the potential risk of contamination of the cathode plate flow channel area.

[0030] Optionally, the anode plate has at least one anode plate reinforcing structure protruding towards the membrane electrode in the anode plate injection sealing groove, and the cathode plate has a cathode plate reinforcing structure protruding towards the membrane electrode corresponding to the anode plate reinforcing structure, and both the anode plate reinforcing structure and the cathode plate reinforcing structure abut against the membrane electrode.

[0031] According to the above technical means, an anode plate reinforcement structure protruding towards the membrane electrode is provided on the anode plate and abuts against the membrane electrode. Corresponding to the anode plate reinforcement structure, a cathode plate reinforcement structure protruding towards the membrane electrode is provided on the cathode plate, which also abuts against the membrane electrode. The anode plate reinforcement structure and the cathode plate reinforcement structure are arranged opposite to each other. The anode plate reinforcement structure and the cathode plate reinforcement structure can provide support for the membrane electrode, thereby avoiding warping damage to the membrane electrode caused by excessive injection pressure during the injection process of the single cell frame structure. At the same time, through the design of the anode plate reinforcement structure and the cathode plate reinforcement structure, the anode plate and the cathode plate form their own reinforcement structure, improving the structural strength of the anode plate and the cathode plate, thereby avoiding the risk of warping and deformation of the anode plate or the cathode plate during transportation.

[0032] Optionally, the membrane electrode includes a membrane electrode reaction zone and a membrane electrode frame. The membrane electrode frame is provided with a plurality of membrane electrode glue injection connection holes. The number of membrane electrode glue injection connection holes is greater than the number of anode plate glue injection vent holes and cathode plate glue injection connection holes. Membrane electrode glue injection connection holes are provided on the membrane electrode at positions corresponding to the anode plate glue injection vent holes and cathode plate glue injection connection holes. The corresponding anode plate glue injection vent holes, membrane electrode glue injection connection holes and cathode plate glue injection connection holes form the glue injection channel.

[0033] According to the above technical means, the membrane electrode is provided with membrane electrode injection connection holes at the positions corresponding to the anode plate injection vent hole and the cathode plate injection connection hole. The membrane electrode injection connection holes, the anode plate injection vent hole and the cathode plate injection connection hole are coaxially arranged to form the injection channel of the single cell frame structure. The number of membrane electrode injection connection holes on the membrane electrode is greater than the number of anode plate injection vent holes and cathode plate injection connection holes, which facilitates the entry of sealant from the cathode side of the membrane electrode into the anode side of the membrane electrode, avoids excessive injection pressure on one side of the membrane electrode, and improves injection efficiency.

[0034] An integrated glue-sealed fuel cell single cell structure stack is provided, wherein the stack comprises multiple integrated glue-sealed fuel cell single cell structures stacked and assembled sequentially.

[0035] A glue injection mold is used in the integrated glue injection sealing fuel cell single cell structure. The mold includes: a glue injection upper mold with multiple glue injection channels opened along the thickness direction. The glue injection channels are coaxially arranged with the glue injection channels. The molding surface of the glue injection upper mold is provided with a water cavity sealing glue injection groove for the glue injection molding of the water cavity sealing ring. The middle part of the glue injection upper mold is provided with a glue injection upper mold cooling groove.

[0036] The lower injection mold has multiple mold outlet channels along the thickness direction. The mold outlet channels are coaxially arranged with the injection channel. The lower injection mold is provided with a lower injection mold sealing groove corresponding to the water cavity injection sealing groove. The lower injection mold is provided with a lower injection mold cooling groove corresponding to the upper injection mold cooling groove.

[0037] The water cavity sealing injection groove and the lower injection mold sealing molding groove cooperate to form the sealing molding area of ​​the injection mold, and the lower injection mold cooling groove and the upper injection mold cooling groove cooperate to form the hollow cooling area of ​​the injection mold.

[0038] According to the above technical means, the upper injection mold cooling groove opened in the middle of the upper injection mold, together with the lower injection mold cooling groove opened in the corresponding upper injection mold cooling groove, forms the hollow cooling zone of the injection mold. The flow field area of ​​the single-cell frame structure is located in the hollow cooling zone. The water cavity sealing injection groove and the lower injection mold sealing molding groove cooperate to form the sealing molding zone of the injection mold. The sealing area of ​​the single-cell frame structure is located in the sealing molding zone. Through the injection flow channel set on the molding surface of the upper injection mold, the injection flow channel corresponds one-to-one with the injection channel on the single-cell frame structure. The sealant flows into the sealing area of ​​the single-cell structure through the injection flow channel and forms a sealing structure in the sealing molding zone of the injection mold. By heating and curing the sealing structure in the sealing molding zone, since the flow field area is located in the hollow cooling zone, the heating and curing process of the sealing structure in the sealing molding zone can effectively isolate the middle part of the single-cell structure from the influence of temperature changes, thereby avoiding damage to the flow field area of ​​the single-cell structure due to excessive heating temperature and reducing the risk of warping of the single-cell structure.

[0039] Optionally, the upper mold for dispensing glue is provided with a sealing groove for dispensing glue on the cathode plate, and the shape of the sealing groove for dispensing glue on the upper mold matches that of the overflow groove for dispensing glue on the cathode plate.

[0040] The lower injection mold is provided with a sealing groove corresponding to the glue overflow groove of the anode plate, and the shape of the sealing groove of the lower injection mold matches the shape of the glue overflow groove of the anode plate.

[0041] The upper mold sealing groove and the lower mold sealing groove cooperate to form the sealing area of ​​the injection mold.

[0042] According to the above technical means, the adhesive overflow grooves of the cathode plate and the anode plate are located within the adhesive sealing area of ​​the adhesive injection mold during the adhesive injection process, thereby avoiding adhesive overflow problems inside the single cell structure during the adhesive injection process.

[0043] A manufacturing process for an integrated glue-sealed fuel cell single-cell structure involves using a glue-injection mold to integrally mold the integrated glue-sealed fuel cell single-cell structure. The process includes:

[0044] The single-cell frame structure is placed on the molding surface of the lower injection mold;

[0045] The upper injection mold and the lower injection mold are then joined together.

[0046] A vacuum pump is used to vent the second gas inside the single-cell frame structure through the glue outlet channel of the mold.

[0047] Sealing compound is injected into the sealing area through the mold injection channel using a low-pressure injection process, thereby forming the sealing structure within the sealing area.

[0048] The sealing structure is heated and cured in the mold sealing and molding area.

[0049] Based on the aforementioned technical means, this application employs a low-pressure injection process to uniformly inject sealant into the single-cell frame structure, filling the gaps between structures and effectively achieving sealing. The low-pressure injection process provides lower injection pressure, avoiding damage to the battery structure caused by excessive injection pressure. Furthermore, it reduces or eliminates air bubbles generated during injection, improving the quality of the sealant injection. Using the integrated sealant injection process for fuel cell single-cell structures proposed in this application, the production of fuel cell single-cell structures can be completed in a short time, significantly improving production efficiency and meeting the needs of mass production.

[0050] The beneficial effects of this invention are as follows: By injecting sealant into the injection holes provided on the single-cell frame structure to form a sealed structure, and simultaneously sealing and connecting the single-cell frame structure to form an integrated fuel cell single-cell structure, this application simultaneously seals and connects the anode plate, membrane electrode assembly, and cathode plate by injecting sealant once; the first notch opened on the anode sealing area allows the sealant to avoid forming a seal between the anode first gas channel and the anode flow field within the anode sealing area, thereby allowing the first gas to enter and exit the anode flow field, while isolating the first gas channel from the cooling water channel and the second gas channel, thereby preventing the second gas or cooling water from entering the anode flow field; the notch opened on the cathode sealing area... The second notch allows the sealant within the cathode sealing area to avoid forming a seal between the cathode plate and the cathode flow field at the second gas channel, thus allowing the second gas to enter and exit the cathode flow field. Simultaneously, it isolates the second gas channel from the cooling water channel and the first gas channel, preventing the first gas or cooling water from entering the cathode flow field. The third notch in the water cavity sealing area allows the sealant within the water cavity sealing area to avoid forming a seal between the cooling water gas channel and the cooling water flow field, allowing cooling water to enter and exit the cooling water flow field. Simultaneously, it isolates the cooling water channel from the first gas channel and the second gas channel, preventing the second gas or first gas from entering the cooling water flow field. The integrated sealant-sealed fuel cell single-cell structure proposed in this application effectively improves the single-cell sealing performance and production efficiency, simplifies the single-cell assembly process, and reduces the production cost of fuel cell single cells, thus meeting the needs of mass production of single cells. Furthermore, the integrated sealing structure effectively reduces the ratio of the sealing structure to the electrode plate area, thereby increasing the effective reaction area ratio of the single-cell structure and improving the volumetric power density of the fuel cell. Attached Figure Description

[0051] Figure 1 This is a cross-sectional schematic diagram of a single-cell structure according to an embodiment of the present invention;

[0052] Figure 2 This is an exploded view of the single-cell structure according to an embodiment of the present invention;

[0053] Figure 3 This is a cross-sectional schematic diagram of the single-cell frame structure according to an embodiment of the present invention;

[0054] Figure 4 for Figure 2 Schematic diagram of the structure of the anode plate;

[0055] Figure 5 for Figure 2 Schematic diagram of the structure of the intermediate cathode plate;

[0056] Figure 6 for Figure 2 Schematic diagram of the middle film electrode;

[0057] Figure 7 for Figure 2 Schematic diagram of the structure of the anode sealing ring;

[0058] Figure 8 for Figure 2 Schematic diagram of the structure of the cathode sealing ring;

[0059] Figure 9 for Figure 2 Schematic diagram of the structure of the sealing ring in the middle water cavity;

[0060] Figure 10 This is a schematic cross-sectional view of the gas manifold shown in an embodiment of this application;

[0061] Figure 11 This is a schematic diagram of the structure of a single-cell battery stack shown in an embodiment of this application;

[0062] Figure 12 This is a schematic cross-sectional view of the glue injection mold and single-cell frame structure glue injection process shown in the embodiments of this application;

[0063] Figure 13 This is a flowchart illustrating the manufacturing process of an integrated glue-sealed fuel cell single cell structure according to an embodiment of this application.

[0064] Part Number Explanation

[0065] Single-cell frame structure 1, cooling water flow field 101c;

[0066] Sealing structure 2, anode sealing ring 201, anode peripheral seal 201a, anode first gas inlet main channel seal 201b, anode cooling water inlet main channel seal 201c, anode second gas inlet main channel seal 201d, anode first gas outlet main channel seal 201e, anode cooling water outlet main channel seal 201f, anode second gas outlet main channel seal 201g, cathode sealing ring 202, cathode peripheral seal 202a, cathode first gas inlet main channel seal 202b, cathode cooling water inlet main channel seal 202c, cathode second gas inlet main channel seal 202g, cathode first gas inlet main channel seal 202a, cathode first gas inlet main channel seal 202b, cathode cooling water inlet main channel seal 202c, cathode second gas inlet main channel seal 202a, cathode first gas inlet main channel seal 202b, cathode cooling water inlet main channel seal 202c, cathode second gas inlet main channel seal 202a, cathode first gas inlet main channel seal 202a, cathode cooling water inlet main channel seal 202b, cathode cooling water inlet main channel seal 202c, cathode second gas inlet main channel seal 202a, cathode first ... Channel seal 202d, cathode first gas outlet main channel seal 202e, cathode cooling water outlet main channel seal 202f, cathode second gas outlet main channel seal 202g, water cavity sealing ring 203, water cavity peripheral seal 203a, water cavity first gas inlet main channel seal 203b, water cavity cooling water inlet main channel seal 203c, water cavity second gas inlet main channel seal 203d, water cavity first gas outlet main channel seal 203e, water cavity cooling water outlet main channel seal 203f, water cavity second gas outlet main channel seal 203g, sealing connecting column 204;

[0067] Anode plate 3, anode plate first gas channel boss 301, anode plate first gas inlet channel boss 301a, anode plate first gas outlet channel boss 301b, first connecting channel 302, first gas duct 302a, first gas confluence groove 302b, anode plate flow channel expansion area 302c, anode plate flow channel area 303, anode plate frame 304, anode plate first gas channel 305, anode plate cooling water channel 306, anode plate second gas channel 307, anode plate glue injection sealing groove 308, anode plate glue injection vent hole 308a, anode plate reinforcing structure 308b, anode glue blocking structure 309, anode plate glue injection overflow groove 310, anode plate second gas channel boss 311, anode plate second gas inlet channel boss 311a, anode plate second gas outlet channel boss 311b, anode plate cooling water channel boss 312, anode plate cooling water inlet channel boss 312a, anode plate cooling water outlet channel boss 312b;

[0068] Cathode plate 4, cathode plate second gas channel boss 401, cathode plate second gas inlet channel boss 401a, cathode plate second gas outlet channel boss 401b, second connecting channel 402, second gas duct 402a, second gas manifold 402b, cathode plate flow channel expansion area 402c, cathode plate flow channel area 403, cathode plate frame 404, cathode plate second gas channel 405, cathode plate cooling water channel 406, cathode plate first gas channel 407, cathode plate glue injection sealing groove 408, cathode plate glue injection connection hole 408a, cathode plate reinforcing structure 408b, cathode glue blocking structure 409, cathode plate glue injection overflow groove 410, cathode plate first gas channel boss 411, cathode plate first gas inlet channel boss 411a, cathode plate first gas outlet channel boss 411b, cathode plate cooling water channel boss 412, cathode plate cooling water inlet channel boss 412a, cathode plate cooling water outlet channel boss 412b;

[0069] Membrane electrode 5, membrane electrode reaction zone 501, membrane electrode frame 502, membrane electrode glue injection connection hole 503;

[0070] Battery stack 6;

[0071] 7. Injection mold, upper injection mold 701, injection channel 701a, water cavity sealing injection groove 701b, upper injection mold cooling groove 701c, upper injection mold sealing groove 701d, lower injection mold 702, mold outlet channel 702a, lower injection mold sealing and forming groove 702b, lower injection mold cooling groove 702c, lower injection mold sealing groove 702d, sealing and forming area 703, hollow cooling area 704, injection mold sealing area 705. Detailed Implementation

[0072] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0073] Please see Figures 1 to 13It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show components relevant to the present invention and are not drawn according to the actual number, shape, and size of components in implementation. In actual implementation, the form, quantity, and proportion of each component can be arbitrarily changed, and the component layout may be more complex. The structures, proportions, and sizes shown in the accompanying drawings are only for illustrative purposes to aid those skilled in the art and are not intended to limit the implementation conditions of the present invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effects and objectives of the present invention, should still fall within the scope of the technical content disclosed in the present invention. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are only for clarity of description and are not intended to limit the scope of the present invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the present invention.

[0074] Before describing the embodiments of the present invention in detail, the application environment of the present invention will be described first. The technology of the present invention is mainly applied to the field of automotive fuel cell technology. The present invention is used to solve the problems of low sealing performance of sealing elements in the existing fuel cell single cell structure, low single cell production and assembly efficiency, high production cost, and inability to meet the needs of mass production.

[0075] Please combine Figures 1 to 10 As shown, this application proposes an integrated glue-sealed fuel cell single-cell structure, comprising:

[0076] In an exemplary embodiment of this application, an anode plate 3, a membrane electrode 5, and a cathode plate 4 are stacked sequentially along the same direction to form a single-cell frame structure 1; a flow field region is disposed in the middle of the single-cell frame structure 1, and the flow field region includes an anode flow field, a cathode flow field, and a cooling water flow field 101c; a frame region is disposed around the flow field region on the single-cell frame structure 1, and the frame region is provided with a first gas common channel, a second gas common channel, and a cooling water common channel; a sealing region is disposed on the single-cell frame structure 1, and the sealing region includes an anode sealing region, a cathode sealing region, and a water cavity sealing region, with the anode sealing region located in the first gas common channel. The first notch is located at the second gas common channel, which connects the anode flow field to the first gas common channel. The cathode sealing area is located at the second gas common channel and has a second notch, which connects the cathode flow field to the second gas channel. The water cavity sealing area is located at the cooling water common channel and has a third notch, which connects the cooling water common channel to the cooling water flow field 101c. At least one glue injection channel is opened along the thickness direction of the single cell frame structure 1. The single cell frame structure 1 is injected with sealant through the glue injection channel to form a sealing structure 2 in the sealing area. The sealing structure 2 is used to seal and connect the single cell frame structure 1 to form an integrated glue-sealed fuel cell single cell structure.

[0077] In this embodiment, sealant is injected into the injection channel provided on the single cell frame structure 1, and a sealing structure 2 is formed in the sealing area. At the same time, the single cell frame structure 1 is sealed and connected to form an integrated fuel cell single cell structure. The first notch in the anode sealing area allows the sealant to form a seal between the anode first gas channel and the anode flow field, allowing the first gas to enter and exit the anode flow field. Simultaneously, it isolates the first gas common channel from the cooling water common channel and the second gas common channel, preventing the second gas or cooling water from entering the anode flow field. Similarly, the second notch in the cathode sealing area allows the sealant to form a seal between the cathode plate 4 and the cathode flow field, allowing the second gas to enter and exit the cathode flow field. This also isolates the second gas common channel from the cooling water common channel and the first gas common channel, preventing the first gas or cooling water from entering the cathode flow field. Finally, the third notch in the water cavity sealing area allows the sealant to form a seal between the cooling water channel and the cooling water flow field 101c, allowing cooling water to enter and exit the cooling water flow field 101c. This also isolates the cooling water channel from the first gas channel and the second gas channel, preventing either the second gas or the first gas from entering the cooling water flow field 101c. This application achieves a one-time injection molding process to seal and connect the anode plate 3, membrane electrode 5, and cathode plate 4, thereby ensuring the sealing performance of the single-cell structure while avoiding affecting the reaction efficiency of the single-cell structure. The integrated injection molding sealed fuel cell structure proposed in this application effectively improves the sealing performance and production efficiency of the single cell, simplifies the assembly process, and reduces the production cost of the fuel cell single cell, thus meeting the needs of mass production of single cells. Furthermore, the integrated injection molding sealed structure 2 effectively reduces the ratio of the sealing area to the electrode plate area, thereby increasing the effective reaction area ratio of the single cell and improving the volumetric power density of the fuel cell single cell.

[0078] In another exemplary embodiment, the first gas common channel includes a first gas inlet channel for the anode plate, a first gas outlet channel for the anode plate, a first gas inlet channel for the membrane electrode, a first gas outlet channel for the membrane electrode, a first gas inlet channel for the cathode plate, and a first gas outlet channel for the cathode plate; the second gas common channel includes a second gas inlet channel for the anode plate, a second gas outlet channel for the anode plate, a second gas inlet channel for the membrane electrode, a second gas outlet channel for the membrane electrode, a second gas inlet channel for the cathode plate, and a second gas outlet channel for the cathode plate; the cooling water common channel includes a cooling water inlet channel for the anode plate, a cooling water outlet channel for the anode plate, a cooling water inlet channel for the membrane electrode, a cooling water outlet channel for the membrane electrode, a cooling water inlet channel for the cathode plate, and a cooling water outlet channel for the cathode plate.

[0079] In an exemplary embodiment of this application, the sealing structure 2 includes an anode sealing ring 201, a cathode sealing ring 202, a water cavity sealing ring 203, and a sealing connecting post 204. The sealing connecting post 204 is used to connect the anode sealing ring 201, the cathode sealing ring 202, and the water cavity sealing ring 203 to form an integral unit. The sealing connecting post 204 is formed in the glue injection channel. The anode plate 3 is sealed to the membrane electrode 5 through the anode sealing ring 201, which is used to seal the anode flow field. The cathode plate 4 is sealed to the membrane electrode 5 through the cathode sealing ring 202, which is used to seal the cathode flow field. The water cavity sealing ring 203 is disposed on the side of the cathode plate 4 away from the membrane electrode 5.

[0080] In this embodiment, anode sealing ring 201, cathode sealing ring 202, water cavity sealing ring 203, and sealing connecting post 204 are formed by injecting sealant into the injection hole of the single-cell frame structure 1 in one step. The sealing connecting post 204 is formed in the injection hole of the single-cell frame structure 1, and the anode sealing ring 201, cathode sealing ring 202, and water cavity sealing ring 203 are connected into one unit through the sealing connecting post 204. At the same time, the single-cell frame structure 1 is sealed and connected to form an integrated single-cell structure through the sealing structure 2. The technical solution of this embodiment not only solves the sealing problem of fuel cells and improves the volumetric power density of fuel cells, but also improves the production efficiency of fuel cells and reduces the production cost of fuel cells.

[0081] In another exemplary embodiment, the anode sealing ring 201 includes an anode peripheral seal 201a, an anode first gas inlet main channel seal 201b, an anode cooling water inlet main channel seal 201c, an anode second gas inlet main channel seal 201d, an anode first gas outlet main channel seal 201e, an anode cooling water outlet main channel seal 201f, and an anode second gas outlet main channel seal 201g; the cathode sealing ring 202 includes a cathode peripheral seal 202a, a cathode first gas inlet main channel seal 202b, a cathode cooling water inlet main channel seal 202c, and a cathode... The cathode first gas inlet main channel seal 202d, cathode first gas outlet main channel seal 202e, cathode cooling water outlet main channel seal 202f, and cathode second gas outlet main channel seal 202g are included; the water cavity sealing ring 203 includes the water cavity peripheral seal 203a, the water cavity first gas inlet main channel seal 203b, the water cavity cooling water inlet main channel seal 203c, the water cavity second gas inlet main channel seal 203d, the water cavity first gas outlet main channel seal 203e, the water cavity cooling water outlet main channel seal 203f, and the water cavity second gas outlet main channel seal 203g.

[0082] In an exemplary embodiment of this application, the anode plate 3 is provided with a first gas channel boss 301 protruding towards the membrane electrode 5 at the first notch. The first gas channel boss 301 abuts against the membrane electrode 5. A first connecting channel 302 for connecting the first gas common channel with the anode flow field is opened on the side of the first gas channel boss 301 facing the membrane electrode 5. The cathode plate 4 is provided with a second gas channel boss 401 protruding towards the membrane electrode 5 at the second notch. The second gas channel boss 401 abuts against the membrane electrode 5. A second connecting channel 402 for connecting the second gas common channel with the cathode flow field is opened on the side of the second gas channel boss 401 facing the membrane electrode 5.

[0083] In this embodiment, the anode plate 3 has a first gas channel boss 301 protruding towards the membrane electrode 5 at the first notch, so that the anode sealing ring 201 can avoid the anode plate first gas channel 305 during the forming process, thereby preventing the anode sealing ring 201 from forming a seal at the first notch. This allows the anode plate first gas channel 305 to communicate with the anode plate flow channel area 303 through the first connecting channel 302, and isolates the anode plate first gas channel 305 from the anode plate cooling water channel 306 and the anode plate second gas channel 307, thereby preventing mutual interference between the anode plate first gas channel 305, the anode plate second gas channel 307 and the anode plate cooling water channel 306. Internal leakage; the cathode plate 4 has a second gas channel boss 401 protruding towards the membrane electrode 5 at the second notch, so that the cathode sealing ring 202 can avoid the second gas channel 405 during the forming process, thereby preventing the cathode sealing ring 202 from forming a seal at the second notch. This allows the second gas channel 405 to communicate with the cathode plate flow channel area 403 through the second connecting channel 402, and isolates the second gas channel 405 from the cathode plate cooling water channel 406 and the cathode plate first gas channel 407, thereby preventing mutual internal leakage between the second gas channel 405, the first gas channel 407, and the cathode plate cooling water channel 406. The anode plate first gas channel boss 301 includes an anode plate first gas inlet channel boss 301a and an anode plate first gas outlet channel boss 301b, and the cathode plate second gas channel boss 401 includes a cathode plate second gas inlet channel boss 401a and a cathode plate second gas outlet channel boss 401b.

[0084] In another exemplary embodiment, the anode plate 3 is provided with a second gas channel boss 311 surrounding the second gas channel 307 of the anode plate, and the anode plate 3 is provided with a cooling water channel boss 312 surrounding the cooling water channel 306 of the anode plate. The cathode plate 4 is provided with a first gas channel boss 411 surrounding the first gas channel 407 of the cathode plate, and the cathode plate 4 is provided with a cooling water channel boss 412 surrounding the cooling water channel 406 of the cathode plate. The anode plate second gas channel boss 311 includes an anode plate second gas inlet channel boss 311a and an anode plate second gas outlet channel boss 311b. The anode plate cooling water channel boss 312 includes an anode plate cooling water inlet channel boss 312a and an anode plate cooling water outlet channel boss 312b. The cathode plate first gas channel boss 411 includes a cathode plate first gas inlet channel boss 411a and a cathode plate first gas outlet channel boss 411b. The cathode plate cooling water channel boss 412 includes a cathode plate cooling water inlet channel boss 412a and a cathode plate cooling water outlet channel boss 412b. The membrane electrode 5 has a smooth and flat plate structure.

[0085] In an exemplary embodiment of this application, the anode plate 3 includes an anode plate flow channel region 303 and an anode plate frame 304 surrounding the anode plate flow channel region 303. The anode plate frame 304 is provided with a first anode plate gas channel 305, an anode plate cooling water channel 306, and a second anode plate gas channel 307. The anode plate frame 304 is provided with an anode plate glue injection sealing groove 308 corresponding to the anode sealing area. The first connecting channel 302 includes a first gas duct 302a, a first gas manifold 302b, and an anode plate flow channel expansion region 302c. The first gas duct 302a is connected to the first anode plate gas channel 305, and the anode plate flow channel expansion region 302c is connected to the anode plate flow channel region 303. The first gas manifold 302b is located between the first gas duct 302a and the anode plate flow channel expansion region 302c, and the first gas manifold 302b is used to connect the first gas duct 302a and the anode plate flow channel expansion region 302c.

[0086] In this embodiment, the first gas in the first gas channel enters the first gas manifold 302b through the first gas duct 302a, flows through the first gas manifold 302b and flows into the anode plate flow channel region 303 through the anode plate flow channel expansion region 302c. The design of the first gas duct 302a and the anode plate flow channel extension region 302c increases the diffusion area of ​​the first gas, allowing it to be more evenly distributed within the anode plate flow channel region 303. This increases the contact area between the first gas and the anode-side reaction region of the membrane electrode 5, thereby improving the utilization rate of the first gas in the electrochemical reaction. Secondly, the intake method of the first gas through the first gas duct 302a and the anode plate flow channel extension region 302c into the anode plate flow channel region 303 balances the intake pressure of the first gas, thus avoiding instability in the single-cell anode reaction chamber caused by uneven intake pressure. Simultaneously, the intake method of the first gas through the first gas duct 302a and the anode plate flow channel extension region 302c effectively reduces gas flow resistance, allowing the first gas to smoothly enter the single-cell anode reaction chamber, thereby improving the intake efficiency of the first gas. The first gas manifold 302b, by setting a first gas manifold 302b between the first gas duct 302a and the anode plate flow channel extension region 302c, can effectively improve the uniformity of the distribution of the first gas entering the anode plate flow channel region 303. Since the flow velocity of the first gas in the anode plate flow channel extension region 302c is relatively high, it is easy to cause uneven gas distribution, that is, there are local high concentration areas and low concentration areas of the first gas in the anode plate flow channel extension region 302c. The setting of the first gas manifold 302b can achieve a smooth gas distribution between the first gas duct 302a and the anode plate flow channel extension region 302c, thereby improving the reaction efficiency and stability of the fuel cell. In addition, the first gas manifold 302b can also reduce the flow velocity of the first gas, so that the flow rate of the first gas entering the anode plate flow channel region 303 is evenly distributed.

[0087] In an exemplary embodiment of this application, the cathode plate 4 includes a cathode plate flow channel region 403 and a cathode plate frame 404 surrounding the cathode plate flow channel region 403. The cathode plate frame 404 is provided with a cathode plate second gas channel 405, a cathode plate cooling water channel 406, and a cathode plate first gas channel 407. The cathode plate frame 404 is provided with a cathode plate glue injection sealing groove 408 corresponding to the cathode sealing area. The second connecting channel 402 includes a second gas duct 402a, a second gas manifold 402b, and a cathode plate flow channel expansion region 402c. The second gas duct 402a is connected to the cathode plate second gas channel 405, and the cathode plate flow channel expansion region 402c is connected to the cathode plate flow channel region 403. The second gas manifold 402b is located between the second gas duct 402a and the cathode plate flow channel expansion region 402c, and the second gas manifold 402b is used to connect the second gas duct 402a and the cathode plate flow channel expansion region 402c.

[0088] In this embodiment, the second gas in the second gas channel enters the second gas manifold 402b through the second gas duct 402a, flows through the second gas manifold 402b and flows into the cathode plate flow channel region 403 through the cathode plate flow channel extension region 402c. The design of the second gas duct 402a and the cathode plate flow channel extension region 402c increases the diffusion area of ​​the second gas, allowing it to be more evenly distributed within the cathode plate flow channel region 403. This increases the contact area between the second gas and the cathode-side reaction region of the membrane electrode 5, thereby improving the utilization rate of the second gas in the electrochemical reaction. Secondly, the intake method of the second gas through the second gas duct 402a and the cathode plate flow channel extension region 402c into the cathode plate flow channel region 403 balances the intake pressure of the second gas, thus avoiding instability in the single-cell cathode reaction chamber caused by uneven intake pressure. Simultaneously, the intake method of the second gas through the second gas duct 402a and the cathode plate flow channel extension region 402c effectively reduces gas flow resistance, allowing the second gas to smoothly enter the single-cell cathode reaction chamber, thereby improving the intake efficiency of the second gas. The second gas manifold 402b, located between the second gas duct 402a and the cathode plate flow channel extension region 402c, effectively improves the uniformity of the second gas distribution within the cathode plate flow channel region 403. Due to the high flow velocity of the second gas within the cathode plate flow channel extension region 402c, uneven gas distribution is easily caused, resulting in localized high-concentration and low-concentration areas of the second gas within the anode plate flow channel extension region 302c. The second gas manifold 402b allows for a smooth gas distribution between the second gas duct 402a and the cathode plate flow channel extension region 402c, thereby improving the reaction efficiency and stability of the fuel cell. Furthermore, the second gas manifold 402b can reduce the flow velocity of the second gas, ensuring a more uniform flow rate within the cathode plate flow channel region 403. Both the anode plate flow channel region 303 and the cathode plate flow channel region 403 adopt a concave-convex structure design. The concave surface of the anode plate flow channel region 303 facing the membrane electrode 5 provides a first gas flow channel for the single cell structure. The concave surface of the cathode plate flow channel region 403 facing the membrane electrode 5 provides a second gas flow channel for the single cell structure. The concave surfaces of the anode plate 3 and the cathode plate 4 on the side away from the membrane electrode 5 provide cooling water flow channels for the single cell structure.

[0089] In an exemplary embodiment of this application, an anode resist structure 309 protruding toward the membrane electrode 5 is provided between the first gas manifold 302b and the anode plate glue injection sealing groove 308, and a cathode resist structure 409 protruding toward the membrane electrode 5 is provided between the second gas manifold 402b and the cathode plate glue injection sealing groove 408.

[0090] In this embodiment, the design of the anode resist structure 309 and the cathode resist structure 409 can effectively block the flow of sealant into the anode plate flow channel expansion area 302c or the cathode plate flow channel expansion area 402c during the sealant injection process in the sealing area. Both the anode resist structure 309 and the cathode resist structure 409 are rib structures that protrude towards the membrane electrode 5, which can not only achieve the function of resisting sealant, but also form a self-reinforcing structure on the anode plate 3 and the cathode plate 4, thereby improving the structural strength of the electrode plates.

[0091] In an exemplary embodiment of this application, a plurality of anode plate venting holes 308a are uniformly distributed in the anode plate venting sealing groove 308. The plurality of anode plate venting holes 308a are symmetrical about the center of the anode plate 3. The cathode plate 4 is provided with a cathode plate venting connection hole 408a corresponding to the anode plate venting holes 308a.

[0092] In this embodiment, by injecting sealant into the cathode plate injection connection hole 408a, the sealant enters the sealing area of ​​the single cell frame structure 1. After the sealant enters the sealing area, the gas inside the sealing area is discharged through the anode plate injection vent hole 308a provided on the anode plate 3 to balance the internal gas pressure, ensure the pressure balance of the sealant injection, avoid the formation of cavitation in the sealing structure 2, and thus improve the sealing performance of the sealing structure 2.

[0093] In an exemplary embodiment of this application, an anode plate glue overflow groove 310 is provided between the anode plate flow channel area 303 and the anode plate glue injection sealing groove 308, and a cathode plate glue overflow groove 410 is provided on the cathode plate 4 corresponding to the anode plate glue overflow groove 310.

[0094] In this embodiment, the anode plate glue overflow groove 310 provided between the anode plate flow channel area 303 and the anode plate glue injection sealing groove 308 can effectively prevent glue overflow during glue injection in the anode plate glue injection sealing groove 308, thus avoiding the potential risk of contamination of the anode plate flow channel area 303; the cathode plate glue overflow groove 410 provided between the cathode plate flow channel area 403 and the cathode plate glue injection sealing groove 408 can effectively prevent the potential risk of sealant overflow in the cathode plate glue injection sealing groove 408, thus avoiding the potential risk of contamination of the cathode plate flow channel area 403.

[0095] In an exemplary embodiment of this application, at least one anode plate reinforcing structure 308b protruding toward the membrane electrode 5 is provided in the anode plate injection sealing groove 308, and a cathode plate reinforcing structure 408b protruding toward the membrane electrode 5 is provided on the cathode plate 4 corresponding to the anode plate reinforcing structure 308b, and both the anode plate reinforcing structure 308b and the cathode plate reinforcing structure 408b abut against the membrane electrode 5.

[0096] In this embodiment, an anode plate reinforcement structure 308b protruding towards the membrane electrode 5 is provided on the anode plate 3 and abuts against the membrane electrode 5. Corresponding to the anode plate reinforcement structure 308b, a cathode plate reinforcement structure 408b protruding towards the membrane electrode 5 is provided on the cathode plate 4. The cathode plate reinforcement structure 408b also abuts against the membrane electrode 5, and the anode plate reinforcement structure 308b and the cathode plate reinforcement structure 408b are arranged opposite to each other. The anode plate reinforcement structure 308b and the cathode plate reinforcement structure 408b can provide support for the membrane electrode 5, thereby avoiding warping damage to the membrane electrode 5 due to excessive injection pressure during the injection process of the single cell frame structure 1. At the same time, the design of the anode plate reinforcement structure 308b and the cathode plate reinforcement structure 408b makes the anode plate 3 and the cathode plate 4 form their own reinforcement structures, improving the structural strength of the anode plate 3 and the cathode plate 4, thereby avoiding the risk of warping and deformation of the anode plate 3 or the cathode plate 4 during transportation.

[0097] In an exemplary embodiment of this application, the membrane electrode 5 includes a membrane electrode reaction region 501 and a membrane electrode frame 502. The membrane electrode frame 502 is provided with a plurality of membrane electrode glue injection connection holes 503. The number of membrane electrode glue injection connection holes 503 is greater than the number of anode plate glue injection vent holes 308a and cathode plate glue injection connection holes 408a. Membrane electrode glue injection connection holes 503 are provided at positions corresponding to the anode plate glue injection vent holes 308a and the cathode plate glue injection connection holes 408a. The corresponding anode plate glue injection vent holes 308a, membrane electrode glue injection connection holes 503 and cathode plate glue injection connection holes 408a form a glue injection channel.

[0098] In this embodiment, a membrane electrode 5 is provided with a membrane electrode 5 injection connection hole 503 at the position corresponding to the anode plate injection vent hole 308a and the cathode plate injection connection hole 408a. The membrane electrode 5 injection connection hole 503, the anode plate injection vent hole 308a and the cathode plate injection connection hole 408a are coaxially arranged to form the injection channel of the single cell frame structure 1. The number of membrane electrode 5 injection connection holes 503 on the membrane electrode 5 is greater than the number of anode plate injection vent holes 308a and cathode plate injection connection holes 408a, which facilitates the entry of sealant from the cathode side of the membrane electrode 5 into the anode side of the membrane electrode 5, avoids excessive injection pressure on one side of the membrane electrode 5, and improves injection efficiency.

[0099] Please see Figure 11 As shown, this application also proposes an integrated glue-sealed fuel cell single cell structure stack 6, which comprises multiple integrated glue-sealed fuel cell single cell structures stacked and assembled sequentially.

[0100] In this embodiment, the battery stack 6 includes multiple integrated glue-sealed fuel cell single cell structures stacked and assembled in sequence. The side of the anode plate 3 in the single cell structure facing away from the membrane electrode 5 cooperates with the side of the cathode plate 4 in the adjacent single cell structure facing away from the membrane electrode 5 to form a cooling water cavity. The water cavity sealing ring 203 is used to seal the cooling water cavity.

[0101] Please see Figure 12 As shown, this application also proposes a glue injection mold 7, applied to an integrated glue injection sealing fuel cell single cell structure. The mold includes: a glue injection upper mold 701, with multiple glue injection channels 701a along the thickness direction, the glue injection channels 701a being coaxially arranged with the glue injection channel; a water cavity sealing glue injection groove 701b for the glue injection molding of the water cavity sealing ring 203 is provided on the molding surface of the glue injection upper mold 701; and a glue injection upper mold cooling groove 701c is provided in the middle of the glue injection upper mold 701; and a glue injection lower mold 702, with multiple glue outlet channels along the thickness direction. 702a, the mold outlet channel 702a is coaxially arranged with the injection channel, the lower injection mold 702 is provided with a lower injection mold sealing groove 702b corresponding to the water cavity injection sealing groove, and the lower injection mold 702 is provided with a lower injection mold cooling groove 702c corresponding to the upper injection mold cooling groove 701c; wherein, the water cavity sealing injection groove 701b and the lower injection mold sealing groove 702b cooperate to form the sealing molding area 703 of the injection mold 7, and the lower injection mold cooling groove 702c and the upper injection mold cooling groove 701c cooperate to form the hollow cooling area 704 of the injection mold 7.

[0102] In this embodiment, a water cavity sealing groove 701b is provided in the upper mold 701. During the process of injecting sealant into the mold injection channel 701a, a water cavity sealing ring 203 is formed between the side of the cathode plate 4 away from the membrane electrode 5 and the water cavity sealing groove. Excess sealant in the single cell frame structure 1 is discharged through the mold discharge channel provided in the lower mold 702. The sealing structure 2 of the integrated fuel cell single cell structure is formed in the sealing molding area 703 provided in the injection mold 7. The middle part of the single cell structure is located in the hollow cooling area 704 of the injection mold 7. During the heating and curing process of the sealing structure 2 in the sealing molding area 703, the middle part of the single cell structure can be effectively isolated from the heat source, avoiding the influence of temperature changes. This prevents the reaction area in the middle of the single cell structure from being damaged due to excessive heating temperature and reduces the risk of warping of the single cell structure. The diameter of the inlet of the mold injection channel 701a is larger than that of the outlet of the injection channel, which facilitates the injection operation; the diameter of the outlet inlet of the mold discharge channel 702a is smaller than that of the outlet, which facilitates the discharge of sealant.

[0103] In an exemplary embodiment of this application, the upper injection mold 701 is provided with an upper injection mold sealing groove 701d corresponding to the cathode plate injection overflow groove 410, and the shape of the upper injection mold sealing groove 701d matches the shape of the cathode plate injection overflow groove 410; the lower injection mold 702 is provided with a lower injection mold sealing groove 702d corresponding to the anode plate injection overflow groove 310, and the shape of the lower injection mold sealing groove 702d matches the shape of the anode plate injection overflow groove 310; the upper injection mold sealing groove 701d and the lower injection mold sealing groove 702d cooperate to form the injection mold sealing area 705.

[0104] In this embodiment, the cathode plate glue overflow groove 410 and the anode plate glue overflow groove 310 are located within the glue injection mold sealing area 705 of the glue injection mold 7 during the glue injection process, thereby avoiding glue overflow problems inside the single cell structure during the glue injection process of the glue injection mold 7.

[0105] This application also proposes a manufacturing process for an integrated glue-sealed fuel cell single-cell structure.

[0106] Please see Figure 13 , Figure 13 This is a flowchart illustrating the manufacturing process of an integrated glue-sealed fuel cell single cell structure according to an embodiment of this application.

[0107] like Figure 13 As shown in an exemplary embodiment of this application, the manufacturing process of the integrated glue-sealed fuel cell single cell structure includes at least steps S110 to S150, which are described in detail below:

[0108] Step S110: Place the single-cell frame structure 1 on the molding surface of the lower injection mold 702.

[0109] Step S120: Close the upper injection mold 701 and the lower injection mold 702.

[0110] In step S130, a vacuum pump is used to vent the second gas inside the single-cell frame structure 1 through the mold dispensing channel 702a.

[0111] In step S140, sealant is injected into the sealing area through the mold injection channel 701a using a low-pressure injection process, and the sealing structure 2 is formed in the sealing area.

[0112] In step S150, the sealing structure 2 is heated and cured in the mold sealing molding area 703.

[0113] In this embodiment, the sealing structure 2 of this application uses liquid silicone material. Using low-viscosity liquid silicone material allows for rapid filling of the sealing cavity and rapid curing within a short time, shortening the production time of the single-cell structure and thus improving the production efficiency of the single cell. The injection mold uses the clamping pressure when the upper injection mold 701 and the lower injection mold 702 are closed to fix the anode plate 3, the membrane electrode 5, and the cathode plate 4, forming the hollow cooling zone 704, the sealing zone 705, and the sealing molding zone 703 of the injection mold 7. The hollow cooling zone 704 effectively prevents the middle part of the single-cell structure from contacting the heat source, thereby preventing damage to the reaction zone in the middle of the single-cell structure due to excessive heating temperature and reducing the risk of warping of the single-cell structure. The sealing zone 705 effectively prevents overflow of adhesive during the injection process. In the sealing molding zone 703, a medium-temperature rapid curing process is used to quickly cure the sealant, forming a sealed structure 2. A low-pressure injection process is employed to uniformly inject the sealant into the single-cell frame structure 1, filling the gaps between structures and effectively achieving a seal. Furthermore, the low-pressure injection process provides lower injection pressure, avoiding damage to the single-cell frame structure 1 caused by excessive injection pressure. The low-pressure injection process also reduces or eliminates air bubbles generated during injection, preventing defects such as insufficient material or porosity in the sealed structure 2, thus improving the quality of the sealant injection. Using the integrated sealant injection process for fuel cell single-cell structures proposed in this application, the production of fuel cell single-cell structures can be completed in a short time, greatly improving production efficiency and meeting the needs of mass production.

[0114] Working principle: By stacking the anode plate 3, membrane electrode 5, and cathode plate 4 sequentially on the molding surface of the lower injection mold 702 of the injection mold 7, the upper injection mold 701 and the lower injection mold 702 are closed to form the hollow cooling zone 704, the sealing zone 705, and the sealing molding zone 703 of the injection mold 7. The anode plate 3, membrane electrode 5, and cathode plate 4 are fixed by clamping pressure. Before the injection mold 7 is closed, the second gas inside the injection mold 7 is evacuated to create a negative pressure inside the single cell frame structure 1. During injection, the sealant is prevented from clogging the injection channel, thereby improving the injection efficiency. By injecting sealant into the injection channel provided on the upper injection mold 701, the sealant forms a water cavity sealing ring 203 between the water cavity sealing injection groove 701b and the surface of the cathode plate 4 facing away from the cathode side of the membrane electrode 5. The sealant passes through the cathode plate injection connection hole 40 provided on the cathode plate 4. 8a enters the cathode side of the membrane electrode 5 and forms a cathode sealing ring 202 between the cathode plate 4 and the cathode side of the membrane electrode 5. The sealant enters the anode side of the membrane electrode 5 through the membrane electrode injection connection hole 503 provided on the membrane electrode 5 and forms an anode sealing ring 201 between the anode side of the membrane electrode 5 and the anode plate 3. The single cell frame structure 1 vents the second gas inside the single cell frame structure 1 through the anode plate injection vent hole 308a provided on the anode plate 3 to balance the gas pressure inside the single cell frame structure 1, thereby ensuring the injection efficiency. After the sealant fills the single cell frame structure 1, the excess sealant flows from the anode plate injection vent hole 308a into the mold injection channel, thereby completing the injection. After the injection is completed, the sealant inside the single cell frame structure 1 is rapidly cured by a medium-temperature rapid curing process on the sealing molding area 703 of the injection mold 7 to form a sealing structure 2, thereby sealing and connecting to form a single cell structure.This application achieves a sealing connection between the anode plate 3, membrane electrode 5, and cathode plate 4 through a single injection of sealant, thus sealing the anode and cathode flow fields. A water cavity sealing ring 203 is formed on the side of the cathode plate 4 away from the membrane electrode 5 to create a cooling flow field, preventing internal leakage between the first gas, the second gas, or cooling water. The first gas channel protrusion on the anode plate 3 and the second gas channel protrusion on the cathode plate 4 prevent sealant from forming a seal at the first gas inlet and outlet channels of the anode plate 3, and at the second gas inlet and outlet channels of the cathode plate 4 during sealant injection. This avoids clogging of the first gas duct 302a and the second gas duct 402a, thereby ensuring the sealing performance of the single-cell structure. While avoiding the beneficial effect of affecting the reaction efficiency of the single cell structure, the uniformity of the first gas intake in the anode flow field can be effectively improved by setting the first gas manifold 302b on the anode plate 3, and the uniformity of the second gas intake in the cathode flow field can be effectively improved by setting the second gas manifold 402b on the cathode plate 4. The integrated glue-sealed fuel cell single cell structure proposed in this application effectively improves the sealing performance and production efficiency of the single cell, simplifies the assembly process of the single cell, and reduces the production cost of the fuel cell single cell, thus having the beneficial effect of meeting the needs of mass production. In addition, the integrally formed sealing structure 2 effectively reduces the ratio of the sealing structure 2 to the electrode plate area, thereby increasing the effective reaction area ratio of the single cell structure and thus improving the volumetric power density of the fuel cell.

[0115] The above embodiments are merely preferred embodiments provided to fully illustrate the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention.

Claims

1. An integrated glue-sealed fuel cell single-cell structure, characterized in that, include: An anode plate, a membrane electrode, and a cathode plate are stacked sequentially along the same direction to form a single-cell frame structure. A flow field region is located in the middle of the single-cell frame structure, and includes an anode flow field, a cathode flow field, and a cooling water flow field. A frame region is located around the flow field region on the single-cell frame structure, and includes a first gas common channel, a second gas common channel, and a cooling water common channel. A sealing region is located on the single-cell frame structure, and includes an anode sealing region, a cathode sealing region, and a water cavity sealing region. The anode sealing region has a first notch at the first gas common channel, which connects the anode flow field to the first gas common channel. The cathode sealing region has a second notch at the second gas common channel. A notch is used to connect the cathode flow field with the second gas common channel. The water cavity sealing area has a third notch located at the cooling water common channel, which is used to connect the cooling water common channel with the cooling water flow field. At least one injection channel is opened along the thickness direction of the single cell frame structure. The single cell frame structure is injected with sealant through the injection channel to form a sealing structure in the sealing area. The sealing structure is used to seal and connect the single cell frame structure to form the integrated injection-sealed fuel cell single cell structure. The sealing structure includes an anode sealing ring, a cathode sealing ring, a water cavity sealing ring, and a sealing connecting post. The sealing connecting post is used to connect the anode sealing ring, the cathode sealing ring, the water cavity sealing ring, and the sealing connecting post. The cathode sealing ring and the water cavity sealing ring are connected to form an integral unit, and the sealing connecting post is formed in the glue injection channel; the anode plate is sealed to the membrane electrode through the anode sealing ring, and the anode sealing ring is used to seal the anode flow field; the cathode plate is sealed to the membrane electrode through the cathode sealing ring, and the cathode sealing ring is used to seal the cathode flow field; the water cavity sealing ring is located on the side of the cathode plate away from the membrane electrode; the first gas common channel includes a first gas inlet main channel for the anode plate, a first gas outlet main channel for the anode plate, a first gas inlet main channel for the membrane electrode, a first gas outlet main channel for the membrane electrode, a first gas inlet main channel for the cathode plate, and a first gas outlet main channel for the cathode plate; the second gas common channel... The system includes a second gas inlet main channel for the anode plate, a second gas outlet main channel for the anode plate, a second gas inlet main channel for the membrane electrode, a second gas outlet main channel for the membrane electrode, a second gas inlet main channel for the cathode plate, and a second gas outlet main channel for the cathode plate; the common cooling water channel includes a cooling water inlet main channel for the anode plate, a cooling water outlet main channel for the anode plate, a cooling water inlet main channel for the membrane electrode, a cooling water outlet main channel for the membrane electrode, a cooling water inlet main channel for the cathode plate, and a cooling water outlet main channel for the cathode plate; the anode sealing ring includes an anode circumferential seal, a seal for the first gas inlet main channel for the anode, a seal for the cooling water inlet main channel for the anode, a seal for the second gas inlet main channel for the anode, a seal for the first gas outlet main channel for the anode, a seal for the cooling water outlet main channel for the anode, and a seal for the second gas outlet main channel for the anode;The cathode sealing ring includes a cathode circumferential seal, a cathode first gas inlet main channel seal, a cathode cooling water inlet main channel seal, a cathode second gas inlet main channel seal, a cathode first gas outlet main channel seal, a cathode cooling water outlet main channel seal, and a cathode second gas outlet main channel seal; the water cavity sealing ring includes a water cavity circumferential seal, a water cavity first gas inlet main channel seal, a water cavity cooling water inlet main channel seal, a water cavity second gas inlet main channel seal, a water cavity first gas outlet main channel seal, a water cavity cooling water outlet main channel seal, and a water cavity second gas outlet main channel seal; the anode plate has a protrusion at the first notch facing the membrane electrode. The anode plate has a first gas channel protrusion that abuts against the membrane electrode. The first gas channel protrusion has a first connecting channel on the side facing the membrane electrode, connecting the first gas common channel with the anode flow field. The cathode plate has a second gas channel protrusion at the second notch, protruding towards the membrane electrode. The second gas channel protrusion abuts against the membrane electrode. The second gas channel protrusion has a second connecting channel on the side facing the membrane electrode, connecting the second gas common channel with the cathode flow field.

2. The integrated glue-sealed fuel cell single-cell structure according to claim 1, characterized in that: The anode plate includes an anode plate flow channel area and an anode plate frame surrounding the anode plate flow channel area. The anode plate frame is provided with a first anode plate gas channel, an anode plate cooling water channel, and a second anode plate gas channel. The anode plate frame is provided with an anode plate glue injection sealing groove corresponding to the anode sealing area. The first connecting channel includes a first gas duct, a first gas manifold, and an anode plate flow channel expansion area. The first gas duct is connected to the first anode plate gas channel, and the anode plate flow channel expansion area is connected to the anode plate flow channel area. The first gas manifold is located between the first gas duct and the anode plate flow channel expansion area, and the first gas manifold is used to connect the first gas duct and the anode plate flow channel expansion area.

3. The integrated glue-sealed fuel cell single-cell structure according to claim 2, characterized in that: The cathode plate includes a cathode plate flow channel area and a cathode plate frame surrounding the cathode plate flow channel area. The cathode plate frame is provided with a second cathode plate gas channel, a cathode plate cooling water channel, and a first cathode plate gas channel. A cathode plate glue injection sealing groove is provided on the cathode plate frame corresponding to the cathode sealing area. The second connecting channel includes a second gas duct, a second gas manifold, and a cathode plate flow channel expansion area. The second gas duct is connected to the second cathode plate gas channel, and the cathode plate flow channel expansion area is connected to the cathode plate flow channel area. The second gas manifold is located between the second gas duct and the cathode plate flow channel expansion area, and the second gas manifold is used to connect the second gas duct and the cathode plate flow channel expansion area.

4. The integrated glue-sealed fuel cell single-cell structure according to claim 3, characterized in that: An anode resist structure protruding towards the membrane electrode is provided between the first gas manifold and the anode plate glue injection sealing groove, and a cathode resist structure protruding towards the membrane electrode is provided between the second gas manifold and the cathode plate glue injection sealing groove.

5. The integrated glue-sealed fuel cell single-cell structure according to claim 4, characterized in that: The anode plate has a plurality of anode plate venting holes evenly distributed in the venting groove. The plurality of anode plate venting holes are symmetrical about the center of the anode plate. The cathode plate has a cathode plate venting connection hole corresponding to the anode plate venting holes.

6. The integrated glue-sealed fuel cell single-cell structure according to claim 5, characterized in that: An anode plate glue overflow groove is provided between the anode plate flow channel area and the anode plate glue injection sealing groove, and a cathode plate glue overflow groove is provided on the cathode plate corresponding to the anode plate glue overflow groove.

7. The integrated glue-sealed fuel cell single-cell structure according to claim 6, characterized in that: The anode plate is provided with at least one anode plate reinforcement structure protruding towards the membrane electrode in the glue injection sealing groove. The cathode plate is provided with a cathode plate reinforcement structure protruding towards the membrane electrode corresponding to the anode plate reinforcement structure. Both the anode plate reinforcement structure and the cathode plate reinforcement structure abut against the membrane electrode.

8. The integrated glue-sealed fuel cell single-cell structure according to claim 7, characterized in that: The membrane electrode includes a membrane electrode reaction zone and a membrane electrode frame. The membrane electrode frame is provided with a plurality of membrane electrode glue injection connection holes. The number of membrane electrode glue injection connection holes is greater than the number of anode plate glue injection vent holes and cathode plate glue injection connection holes. Membrane electrode glue injection connection holes are provided on the membrane electrode at positions corresponding to the anode plate glue injection vent holes and cathode plate glue injection connection holes. The corresponding anode plate glue injection vent holes, membrane electrode glue injection connection holes and cathode plate glue injection connection holes form the glue injection channel.

9. An integrated glue-sealed fuel cell single-cell structure stack, characterized in that, The battery stack comprises multiple integrated glue-sealed fuel cell single cell structures as described in any one of claims 1-8, which are stacked and assembled sequentially.

10. A glue injection mold, applied to the integrated glue injection sealing fuel cell single cell structure as described in any one of claims 6-8, characterized in that, The injection mold includes: an upper injection mold with multiple injection channels along its thickness direction, the injection channels being coaxially arranged with the injection channel; a water cavity sealing injection groove for injection molding of the water cavity sealing ring on the molding surface of the upper injection mold; and an upper injection mold cooling groove in the middle of the upper injection mold; and a lower injection mold with multiple discharge channels along its thickness direction, the discharge channels being coaxially arranged with the injection channel; a lower injection mold sealing molding groove corresponding to the water cavity sealing injection groove; and a lower injection mold cooling groove corresponding to the upper injection mold cooling groove; wherein the water cavity sealing injection groove and the lower injection mold sealing molding groove cooperate to form the sealing molding area of ​​the injection mold, and the lower injection mold cooling groove and the upper injection mold cooling groove cooperate to form the hollow cooling area of ​​the injection mold; The diameter of the injection inlet of the mold injection channel is larger than the diameter of the injection outlet.

11. The injection mold according to claim 10, characterized in that: The upper injection mold is provided with an upper injection mold sealing groove corresponding to the cathode plate injection overflow groove, and the shape of the upper injection mold sealing groove matches the shape of the cathode plate injection overflow groove; the lower injection mold is provided with a lower injection mold sealing groove corresponding to the anode plate injection overflow groove, and the shape of the lower injection mold sealing groove matches the shape of the anode plate injection overflow groove; the upper injection mold sealing groove and the lower injection mold sealing groove cooperate to form the sealing area of ​​the injection mold.

12. A manufacturing process for an integrated glue-sealed fuel cell single-cell structure, comprising using the glue-injection mold as described in any one of claims 10-11 to integrally glue-inject and form the integrated glue-sealed fuel cell single-cell structure as described in any one of claims 1-8, characterized in that, The process includes: placing the single-cell frame structure on the molding surface of the lower injection mold; closing the upper injection mold and the lower injection mold; using a vacuum pump to vent the gas inside the single-cell frame structure through the injection channel of the mold; injecting sealant into the sealing area through the injection channel of the mold using a low-pressure injection process, and forming the sealing structure in the sealing area; and heating and curing the sealing structure in the sealing molding area of ​​the mold.

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