Multi-cell splicing type electric pile structure, electric pile and power generation system

Abstract

The invention relates to a multi-battery splicing type electric pile structure, an electric pile and a power generation system, and belongs to the technical field of batteries, the multi-battery splicing type electric pile structure comprises a plurality of electrode plates, the plurality of electrode plates are stacked, at least one part of the anode surface of each electrode plate forms a first area, and at least one part of the cathode surface of each electrode plate forms a second area; at least one part of the cathode surface of each electrode plate forms a second area; the supporting plate is arranged between the adjacent electrode plates, a plurality of grooves are formed in the supporting plate, and a through hole is formed in the bottom wall of each groove; the battery is arranged in the groove, at least part of the projection of the battery working area on the supporting plate is overlapped with the projection of the through hole on the supporting plate, and the projection of the battery on the supporting plate is located in the first area and the second area, so that the problems that the sintering flatness of a large-size battery is poor, and the stability of the battery is poor are effectively solved. The preparation problems of deformation and cracking are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a multi-cell splicing type stack structure, a stack and a power generation system. BACKGROUND

[0002] In the field of solid oxide fuel cells, the design of the cell support structure is one of the key factors determining its performance, cost and large-scale application. According to the different support bodies, SOFCs are mainly divided into metal support type, anode support type and electrolyte support type. Among them, the metal support has the advantages of good mechanical properties, strong thermal shock resistance and low cost, and is therefore considered as the future research trend.

[0003] However, the preparation process of the cell is complex, especially the larger the area of the cell, the higher the sintering difficulty of the cell, the poorer the flatness, and the easier the deformation and cracking. Moreover, SOFCs usually belong to high-temperature fuel cells, and the working temperature is about 600-800℃, and the thermal stress generated during work is much higher than that of conventional fuel cells, so the safety and stability of the single cell are required to be higher. SUMMARY

[0004] The embodiments of the present application provide a multi-cell splicing type stack structure, a stack and a power generation system to solve the problem that the larger the area of the cell prepared in the related art, the poorer the sintering flatness, and the larger the area, the more likely the deformation and cracking.

[0005] First aspect A multi-cell splicing type stack structure is provided, which comprises: a plurality of electrode plates, the plurality of electrode plates are stacked, at least a part of the anode surface of each electrode plate constitutes a first area, and at least a part of the cathode surface of each electrode plate constitutes a second area; a support plate is arranged between adjacent electrode plates, the support plate is provided with a plurality of grooves, and each groove bottom wall is provided with a through hole; a cell is arranged in the groove, and the projection of the working area of the cell on the support plate at least partially overlaps with the projection of the through hole on the support plate, and the projection of the cell on the support plate is located in the first area and in the second area.

[0006] By adopting the above technical scheme: by arranging a plurality of grooves on the support plate, the grooves provide precise positioning installation space for the cell, and the through hole provides a physical channel for gas diffusion and thermal stress release at high temperature, thereby reducing local stress concentration in the sintering process and reducing the risk of deformation and cracking caused by stress concentration in the high-temperature sintering process, and adopting a splicing type structure, the large cell is divided into a plurality of small units, the size requirement of the single cell is reduced, the flatness requirement of the cell is reduced, and the preparation process is simplified.

[0007] In some embodiments, the battery is arranged protruding from the groove in an area where the battery and the through hole overlap in projection on the support plate.

[0008] By adopting the technical scheme, the battery is arranged protruding, so that the working area of the battery and the expansion of the metal area of the battery are not coplanar after high-temperature operation, and there is a certain deformation space, thereby reducing stress concentration.

[0009] In some embodiments, the electrode plate is provided with a first support portion and a second support portion, the first support portion is arranged protruding along the circumference at the edge of the first area, and the second support portion is arranged protruding along the circumference at the edge of the second area; the first support portion, the electrode plate and the support plate form an anode chamber; the second support portion, the electrode plate and the support plate form a cathode chamber; the anode of the battery is in contact with the anode chamber, and the cathode of the battery is in contact with the cathode chamber; the anode chamber and the cathode chamber are not in communication with each other internally.

[0010] By adopting the technical scheme, local point supports are formed at key end positions of the gas flow channels, heat deformation and stress concentration of the support plate in sintering high temperature and operation heat cycle are effectively inhibited, end structure stability and air tightness of the gas flow channel and the air flow channel are ensured, and flow channel misplacement, gas leakage or battery contact failure caused by bending of the support plate are avoided.

[0011] In some embodiments, the second support portion is formed by the electrode plate protruding from the anode surface to the cathode surface, and a first recess is formed at the back of the second support portion.

[0012] By adopting the technical scheme, the second support portion is formed by the electrode plate protruding from the anode surface to the cathode surface, material can be effectively saved, and convenient processing is achieved, and the first recess can also be used as a buffer for gas entering the reaction area.

[0013] In some embodiments, a plurality of first flow channel ribs are arranged protruding in the first area, and a gas flow channel is formed between adjacent first flow channel ribs; and a support rib for supporting the battery is further arranged on the top of the first flow channel rib along the gas flow direction.

[0014] By adopting the technical scheme, the first flow channel rib plays a role in separation and support, so that the gas can flow in a specific channel, avoiding disordered diffusion of the gas, ensuring that the gas can flow to the reaction area according to the predetermined path, the support rib supports the battery to ensure accurate alignment and air tightness of the battery and the gas flow channel, and gas leakage or electrode contact failure caused by instability of the flow channel structure is avoided.

[0015] In some embodiments, a plurality of support ribs are distributed at intervals along the longitudinal direction of the gas flow channel.

[0016] By adopting the above technical solution, the spaced support ribs form a uniform dot matrix support structure in the battery working area, effectively dispersing the sintering thermal stress and the mechanical stress in the operating thermal cycle.

[0017] In some embodiments, a plurality of third support portions are also provided in the first region, and the plurality of third support portions are all connected to the support plate, and the first region is divided into a plurality of gas passage units by the plurality of third support portions.

[0018] By adopting the above technical solution, the third support part can not only support the welding position of the support plate to cope with the bending expansion of the support plate when the temperature rises rapidly, but also divide the gas flow channel into multiple gas channel units, each of which corresponds to the two ends, thus improving uniformity.

[0019] In some embodiments, a plurality of fourth support portions are provided in the second region, and the plurality of fourth support portions are all connected to the support plate, and the second region is divided into a plurality of air channel units by the plurality of fourth support portions.

[0020] By adopting the above technical solution: the fourth support part divides the second area into multiple air channel units. The fourth support part can not only support the welding position of the support plate and avoid deformation of the support plate, but also divide the air flow channel into multiple air channel units, with each flow channel unit corresponding to the two ends.

[0021] In some embodiments, the gas flow channel is connected to a gas storage chamber at its end, and a gas buffer section is provided between the gas flow channel and the gas storage chamber.

[0022] By adopting the above technical solution: the end of the gas flow channel is connected to the gas storage chamber, and a gradient gas buffer space is constructed at the end of the electrode plate. When the gas enters the gas storage chamber, a lateral diffusion path is formed, which reduces the non-uniformity of the gas flow velocity in the flow channel, thereby avoiding performance degradation caused by uneven gas supply.

[0023] Second aspect A fuel cell stack is provided, comprising the multi-cell modular fuel cell stack structure described above.

[0024] Third aspect A power generation system is provided, comprising a fuel cell stack, the fuel cell stack comprising the multi-cell modular fuel cell stack structure described above.

[0025] The beneficial effects of the technical solution provided in this application include: the embodiments of this application provide a multi-cell splicing stack structure, stack and power generation system. The precise positioning and independent sintering of the cells are achieved by the pre-set grooves and through holes on the support plate. The grooves make the cells and the support plate mechanically interlock, so that each cell independently bears thermal stress, avoiding deformation and cracking problems caused by large-area sintering. The layout of the through holes overlapping with the projection of the cell working area optimizes the gas flow path and current collection efficiency. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the overall structure provided for an embodiment of this application; Figure 2 A schematic diagram illustrating the support plate provided in an embodiment of this application; Figure 3 A schematic diagram provided for illustrating the assembly state of the battery and the groove, as provided in an embodiment of this application; Figure 4 A schematic diagram illustrating a gas flow path provided for an embodiment of this application; Figure 5 This is a schematic diagram illustrating the gas buffer section provided in an embodiment of this application; Figure 6 A schematic diagram illustrating the supporting reinforcement provided in an embodiment of this application; Figure 7 A schematic diagram illustrating an airflow channel provided for an embodiment of this application; Figure 8 A simulation diagram illustrating the gas flow channel of a single battery cell, provided for embodiments of this application; Figure 9 A simulation diagram illustrating the airflow channel of a single battery cell, provided for embodiments of this application; Figure 10 A simulation diagram illustrating the gas flow path of the fuel cell stack structure, provided for embodiments of this application; Figure 11 A simulation diagram illustrating the airflow channel of the fuel cell stack structure, provided for embodiments of this application; In the diagram: 1. Electrode plate; 2. First region; 3. Second region; 4. Support plate; 5. Groove; 6. Through hole; 7. Overlapping part; 8. Battery; 9. Gas flow channel; 10. Air flow channel; 11. First support part; 12. Second support part; 13. First flow channel rib; 14. Support rib; 15. Third support part; 16. Gas channel unit; 17. Fourth support part; 18. Second flow channel rib; 19. Air channel unit; 20. Gas storage chamber; 21. Gas buffer part; 22. Circular hole; 23. Step; 24. First recess; 25. Glass adhesive layer. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] This application provides a multi-cell modular stack structure, stack, and power generation system, which can solve the problems in related technologies where the larger the area of ​​the battery fabrication, the poor sintering flatness, and the deformation and cracking caused by excessively large area.

[0030] Example 1 This application provides a multi-cell modular fuel cell stack structure; see [link to relevant documentation]. Figure 1 It includes multiple electrode plates 1, a support plate 4, and a battery 8. The electrode plates 1 are stacked, with at least a portion of the anode surface of each electrode plate 1 forming a first region 2 and at least a portion of the cathode surface of each electrode plate 1 forming a second region 3. The support plate 4 is disposed between adjacent electrode plates 1. The lower end of the support plate 4 is assembled to the lower electrode plate 1 by laser welding, and the upper end of the support plate 4 is assembled to the upper electrode plate 1 by silicone sealant. Multiple grooves 5 are provided on the support plate 4, and the number of grooves 5 determines the number of batteries 8 assembled; the batteries 8 can be four, six, or even more. This application illustrates as follows... Figure 1 The embodiment of the 2×2 battery 8 shown and as follows Figure 4 The embodiment shown is a 3×5 battery 8; other embodiments can be achieved by appropriately adjusting the dimensions of the electrode plate 1 and the support plate 4. (Refer to...) Figures 1-2The figure shows the structure of a 2×2 battery 8. Each groove 5 has a through hole 6 on its bottom wall, and an overlapping portion 7 is formed around the through hole 6 on the bottom wall of the groove 5. The battery 8 is then assembled into the groove 5 by laser welding, specifically by overlapping the edge of the battery 8 onto the overlapping portion 7. The projection of the working area of ​​the battery 8 onto the support plate 4 at least partially overlaps with the projection of the through hole 6 onto the support plate 4, and the projection of the battery 8 onto the support plate 4 is located within the first region 2 and the second region 3. The battery 8 includes, but is not limited to, an anode support battery 8 and an electrolyte support battery 8. In this application, a metal support battery is preferred. When the metal support battery is placed in the groove 5, its metal support plate overlaps the overlapping portion 7. If the anode support battery and the electrolyte support battery are placed directly in the groove 5...

[0031] Reference Figures 1-2 This application employs a modular splicing strategy, embedding the battery 8 into the groove 5 of the support plate 4 using multiple small-sized units. In this embodiment, the battery 8 is a metal-supported battery, with a metal plate at its bottom. Therefore, the edge overlap 7 is fixed by laser welding, while glass glue is used to achieve a flexible, sealed connection between the upper electrode plate 1 and the support plate 4. The glass glue also serves as insulation. It should be noted that to prevent the formation of loops within the battery stack, adjacent electrode plates 1 can only be electrically connected through the battery 8. Therefore, a support plate 4 can only be electrically connected to one electrode plate 1 at most. Thus, the support plate 4 is either connected to both adjacent electrode plates 1 using insulation methods such as glass glue or insulating gaskets, or it can be directly connected to only one electrode plate 1 through welding or other methods of electrical connection. In other embodiments, when the battery 8 is preferably an anode-supported battery, electrolyte-supported battery, or other non-metallic support type battery, it is fixed by adhesive bonding. After the battery 8 is fixed in the groove 5, the projection of the through hole 6 of the support plate 4 onto the working area of ​​the battery 8 is finally overlapped to form a multi-dimensional stress dispersion path, effectively mitigating the risk of deformation caused by the difference in thermal expansion coefficients. The overlapping part 7 of the groove 5 structure enhances the interface bonding strength between the battery 8 and the support plate 4, while the through hole 6 provides a physical channel for gas diffusion and thermal stress release at high temperatures, thereby reducing local stress concentration during rapid heating. Therefore, the technical solution of this application has the following advantages: on the one hand, by using small-sized single battery cells 8, the difficulty of the sintering process is effectively reduced, and the flatness of the large-scale power generation stack is improved; on the other hand, with the mechanical support of the support plate 4, the problem of cracking of the battery 8 during high-temperature cycling is significantly suppressed. At the same time, the flexible connection of the glass glue can compensate for the small deformation differences between different materials, so that the stack structure provided by this application has both the high yield and low processing difficulty of small batteries, and the high power density and excellent power generation performance of large batteries.

[0032] Reference Figure 3In this application, the overall expansion coefficient of the electrolyte and electrodes in the metal-supported battery is slightly higher than that of the metal. Therefore, in this embodiment, a protruding groove 5 is provided in the area where the projected overlap of the installed battery 8 and the through hole 6 on the support plate 4. When the metal-supported battery expands during high-temperature operation, the protruding structure causes the expansion direction of the working area of ​​the metal-supported battery to be misaligned with the expansion direction of the metal support plate 4. The two are not on the same plane, and there is a certain deformation space, which effectively absorbs the stress accumulation caused by the expansion mismatch and reduces thermal stress.

[0033] Reference Figure 4 and Figure 7 In this application, to prevent fuel gas and air from flowing into each other and to ensure sealing, a first support portion 11 and a second support portion 12 are provided on the electrode plate 1. The first support portion 11 is provided circumferentially along the edge of the first region 2, and in this embodiment, it is specifically located at the end of the electrode plate 1. The second support portion 12 is provided circumferentially along the edge of the second region 3, and in this embodiment, it is specifically distributed around the electrode plate 1. The first support portion 11 and the second support portion 12 can also be used as supports while satisfying the sealing effect. Therefore, the first support 11, the electrode plate 1, and the support plate 4 constitute the anode chamber, and the second support 12, the electrode plate 1, and the support plate 4 constitute the cathode chamber. The anode of the battery 8 is in contact with the anode chamber, and the cathode of the battery 8 is in contact with the cathode chamber. In this embodiment, a plurality of circular holes 22 are provided at the end of the electrode plate 1. Fuel gas and air are respectively sent into the anode chamber and the cathode chamber through different circular holes 22. The first support 11 and the second support 12 restrict the specific chambers that the gas can enter and prevent gas from leaking into places that should not be entered, such as fuel gas entering the cathode chamber or leaking outside the stack.

[0034] In other embodiments, both the cathode inlet and outlet are open, or the anode and cathode can be fully or partially inlet through external gas distribution manifolds. The specific inlet method is not limited in this application. Specifically, in this embodiment, the cathode chamber and anode chamber inside the fuel cell stack are not interconnected; the cathode gas is directly vented, and the anode gas is sent to the burner. However, in other embodiments, both the anode and cathode can be designed with open outlets to allow the exhaust gases to contact and burn on the surface of the fuel cell stack core, or both can be piped to the burner for treatment. This application also does not limit this approach.

[0035] Furthermore, the first support portion 11 and the second support portion 12 of this application are formed by stamping on the electrode plate 1, so that the second support portion 12 protrudes from the anode surface to the cathode surface of the electrode plate 1, and the back of the second support portion 12 forms a first recess 24. The stamping method can effectively save materials, and the first recess 24 can also serve as a buffer zone for air intake, allowing the fuel gas to enter the first region 2 for reaction in a relatively gentle state. After stamping, the first support portion 11 is formed on one side of the first recess 24, and the first support portion 11 can be continuously formed or spaced out.

[0036] In this application, the first support portion 11 and the second support portion 12 are connected to the adjacent support plate 4. In one embodiment, both the first support portion 11 and the second support portion 12 are connected to the support plate 4 through a glass adhesive layer 25. In other embodiments, the first support portion 11 and the support plate 4 are welded and sealed, and the second support portion 12 and the support plate 4 are coated with a glass adhesive layer 25. The height of the support structure is slightly higher than its corresponding flow channel, ensuring that even with processing tolerances, the pressure of the stack pressing is mainly transmitted to the support structure. The rigid structure of the support structure can disperse the assembly stress between the battery 8 and the support plate 4, avoiding local stress concentration caused by traditional point contact or line contact. At the same time, the fit design between the support portion and the support plate 4 enhances the overall sealing stability of the stack, suppresses the accumulation of deformation caused by the difference in thermal expansion coefficients during high-temperature operation, and the glass adhesive uses its elastic properties to form a flexible sealing layer with a low elastic modulus at high temperatures, which can absorb the small deformation caused by the difference in thermal expansion between the electrode plate 1 and the support plate 4.

[0037] Reference Figures 5-6In this embodiment, it is preferable to have multiple first flow channel ribs 13 protruding within the designed first region 2, with gas flow channels 9 provided adjacent to each first flow channel rib 13, thereby enabling effective gas flow on the electrode plate 1. In other embodiments, non-flow channel electrode plates such as perforated plates can also be used. The width of the gas flow channel 9 is not limited to 2mm, and the rib width of the first flow channel rib 13 is not limited to 2mm. When the ends of the first region 2 and the second region 3 are provided with first support parts 11 and second support parts 12 to ensure sealing, the height of the corresponding air flow channel 10 will be raised to ensure that the battery 8 can contact the air flow channel 10. When the air flow channel 10 is raised, under the action of the first support part 11, the gas flow channel 9 will move away from the battery 8. Therefore, the top of the first flow channel rib 13 is also provided with support ribs 14 for supporting the battery 8 along the gas flow direction. Multiple support ribs 14 are distributed at intervals along the longitudinal direction of the gas flow channel 9, and the height of the support ribs 14 is generally not limited to 0.2mm. The first flow channel rib 13 serves to separate and support the gas, allowing it to flow within specific channels, preventing disorderly diffusion, and ensuring that the gas flows to the reaction area along a predetermined path. The design of the support rib 14 further expands the cross-sectional area of ​​the gas flow channel 9 in the area in contact with the battery 8, slowing the flow velocity of the fuel gas in this section and increasing the contact time and reaction intensity. Furthermore, appropriate flow channel dimensions reduce gas flow resistance, lower energy loss, and ensure sufficient contact time and area between the gas and the electrodes, improving the reaction efficiency of the battery 8. The support rib 14 provides support and protection for the battery 8, thereby dispersing the thermal expansion stress of the battery 8 under high-temperature operation and preventing localized deformation or cracking due to insufficient support.

[0038] Reference Figure 5 In this embodiment, to enhance the support of the support plate 4, multiple third support portions 15 are also provided in the first region 2. These third support portions 15 are connected to the support plate 4 via a glass adhesive layer 25. In other embodiments, gaskets or welding can also be used. The multiple third support portions 15 divide the first region 2 into multiple gas channel units 16. A circular hole 22 is provided at the end of the electrode plate 1 for gas inlet and outlet. Under the action of the third support portions 15, not only can the welding position of the support plate 4 be supported, but the first region 2 is also divided into multiple gas channel units 16. In this embodiment, since the first region 2 is provided with a gas flow channel 9, the gas flow channel 9 is essentially divided into multiple gas channel units 16, with each gas channel unit 16 corresponding to the position of the circular holes 22 at both ends.

[0039] Furthermore, multiple fourth support portions 17 are protruding within the second region 3. These fourth support portions 17 are all connected to the support plate 4 via a glass adhesive layer 25. In other embodiments, gaskets or welding can also be used; however, to avoid forming loops, the current between adjacent electrode plates can only be transmitted through the battery. Therefore, in some embodiments where both third support portions 15 and fourth support portions 17 are present, the support plate 4 is directly connected to at most one of them via electrical conductivity, such as welding. The multiple fourth support portions 17 divide the second region 3 into multiple air channel units 19. Multiple second flow channel ribs 18 are provided on the second region 3. Air flow channels 10 are formed between adjacent second flow channel ribs 18. The width of the air flow channel 10 includes, but is not limited to, 2 mm; the rib width of the second flow channel rib 18 includes, but is not limited to, 2 mm; and the depth of the air flow channel 10 includes, but is not limited to, 0.5 mm. Similarly, the second flow channel ribs 18 serve a separating and supporting function, allowing air to flow within specific channels, preventing disorderly air diffusion, and ensuring that air flows towards the reaction area along a predetermined path. Appropriate flow channel dimensions can reduce airflow resistance, lower energy loss, and ensure sufficient contact time and area between the air and the electrodes, thereby improving the reaction efficiency of the battery 8. In this embodiment, since an airflow channel 10 is provided on the second region 3, multiple fourth support portions 17 divide the airflow channel 10 into multiple air channel units 19. The fourth support portions 17 can serve as welding positions for the support plate 4 and further divide the airflow channel 10 to align each air channel unit 19 with the corresponding circular hole 22.

[0040] Reference Figures 4-5 Taking a 3×5 battery 8 as an example, the modular assembly of the battery 8 causes local resistance differences in the gas flow channel 9 due to the connection between modules. This can easily lead to uneven gas distribution caused by design flaws in the flow channel. Therefore, to ensure uniform gas distribution, a gas storage chamber 20 is connected to the end of the gas flow channel 9, and a gas buffer section 21 is provided between the gas flow channel 9 and the gas storage chamber 20. Connecting the end of the gas flow channel 9 to the gas storage chamber 20, the gas buffer section 21 forms a pressure regulating node. When the gas enters the gas storage chamber 20, it forms a lateral diffusion path. The gas buffer section 21 can absorb instantaneous flow fluctuations, reduce the unevenness of the gas flow velocity in the flow channel, and thus avoid performance degradation caused by uneven gas supply.

[0041] Reference Figures 4-5In this embodiment, since the first recess 24 is formed by stamping at the end of the electrode plate 1, specifically at the end of the gas flow channel 9, after the first recess 24 is formed, the gas storage chamber 20 is directly inside the first recess 24, and multiple round holes 22 are evenly distributed within the first recess 24. Specifically, the first recess 24 is formed by stamping and includes multiple spaced recessed units and transverse recessed units connecting the multiple recessed units. Multiple round holes 22 are sequentially distributed within the multiple recessed units, and there are, but not limited to, three round holes 22 at the gas inlet end and, but not limited to, four round holes 22 at the outlet after passing through the gas flow channel 9. The three round holes 22 at the inlet end can initially distribute and guide the incoming gas, making it enter the subsequent gas flow channel 9 area more evenly. As the gas flows in the flow channel and participates in the reaction, its flow distribution and pressure state may change. The four round holes 22 at the outlet end can better adapt to this change, further optimize the gas outflow state, and ensure the reasonable flow and full utilization of the gas throughout the battery 8.

[0042] Reference Figure 5 In this embodiment, the gas buffer section 21 includes a protrusion formed by the electrode plate 1, and a step 23 is formed between the protrusion and the gas flow channel 9 and the gas storage chamber 20. Specifically, the depth of the gas flow channel 9 is less than the depth of the gas storage chamber 20, and the gas buffer section 21 includes the step 23 formed between the gas flow channel 9 and the gas storage chamber 20. The protrusion, as the step 23 forming the physical boundary between the gas flow channel 9 and the gas storage chamber 20, reduces the gas flow velocity by expanding the local space. At the same time, the structure of the step 23 forces the gas to diffuse laterally before entering the gas flow channel 9, thereby balancing the gas pressure distribution.

[0043] In summary, the gas buffer section 21 designed in this embodiment significantly reduces the gas flow velocity, forcing the gas to diffuse laterally before entering the flow channel. This effectively balances the gas pressure distribution, greatly reduces the risk of thermal stress concentration caused by localized flow acceleration, and ensures uniform gas distribution within the system. Specifically, referring to 8-9, through the construction of a simulation model, in the fluid simulation experiment of a single battery 8, under the improved effect of the gas buffer section 21, the gas uniformity error value is approximately 0.46%, and the air uniformity error value is approximately 4.35%. Figures 10-11 When the stack structure is composed of 200 cells, the uniformity error of the fuel gas is about 1.63%, and the uniformity error of the air gas is about 1.07%. The uniformity error of conventional anode and cathode is about 6%. Therefore, this application has made a significant improvement compared with the prior art. It not only realizes the construction of large-scale spliced ​​fuel cells, but also improves its uniformity through flow channel design. In addition, it should be noted that the cathode gas is usually in excess, so there is no need to consider the uniformity problem of the cathode gas too much.

[0044] Example 2 This application provides a fuel cell stack, which includes a multi-cell modular fuel cell stack structure as disclosed in Embodiment 1 above. The functional implementation of the multi-cell modular fuel cell stack structure and the functional implementation process of the fuel cell stack will not be described in detail here.

[0045] Example 3 This application provides a power generation system that includes a fuel cell stack. The fuel cell stack includes a multi-cell modular fuel cell stack structure as disclosed in Embodiment 2 above. The functions of the fuel cell stack and the functions and implementation process of the power generation system described above will not be described in detail here.

[0046] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0047] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0048] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A multi-cell modular fuel cell stack structure, characterized in that, It includes: Multiple electrode plates (1) are stacked together, and at least a portion of the anode surface of each electrode plate (1) constitutes a first region (2), and at least a portion of the cathode surface of each electrode plate (1) constitutes a second region (3). A support plate (4) is disposed between adjacent electrode plates (1). The support plate (4) has a plurality of grooves (5), and each groove (5) has a through hole (6) on its bottom wall. The battery (8) is disposed in the groove (5), and the projection of the working area of ​​the battery (8) on the support plate (4) at least partially overlaps with the projection of the through hole (6) on the support plate (4). The projection of the battery (8) on the support plate (4) is located in the first region (2) and in the second region (3).

2. The multi-cell modular fuel cell stack structure as described in claim 1, characterized in that: The battery (8) and the through hole (6) are projected onto the support plate (4) in an area that protrudes from the groove (5).

3. The multi-cell modular fuel cell stack structure as described in claim 1, characterized in that: The electrode plate (1) is provided with a first support part (11) and a second support part (12). The first support part (11) is circumferentially protruding at the edge of the first region (2), and the second support part (12) is circumferentially protruding at the edge of the second region (3). The first support portion (11), the electrode plate (1), and the support plate (4) together form the anode chamber; The second support part (12), the electrode plate (1), and the support plate (4) constitute a cathode chamber; The anode of the battery (8) is in contact with the anode chamber, and the cathode of the battery (8) is in contact with the cathode chamber; The anode chamber and the cathode chamber are not internally connected.

4. The multi-cell modular fuel cell stack structure as described in claim 3, characterized in that: The second support portion (12) is formed by the electrode plate (1) protruding from the anode surface to the cathode surface, and the back of the second support portion (12) forms a first recess (24).

5. The multi-cell modular stack structure as described in claim 1, characterized in that: The first region (2) is provided with a plurality of first flow channel ribs (13), and the gas flow channel (9) is formed between adjacent first flow channel ribs (13). The top of the first flow channel rib (13) is also provided with a support rib (14) for supporting the battery (8) along the gas flow direction.

6. The multi-cell modular stack structure as described in claim 5, characterized in that: Along the longitudinal direction of the gas flow channel (9), a plurality of the support ribs (14) are distributed at intervals.

7. The multi-cell modular stack structure as described in claim 1, characterized in that: The first region (2) is also provided with a plurality of third support parts (15), which are connected to the support plate (4) and divide the first region (2) into a plurality of gas passage units (16) through the plurality of third support parts (15).

8. The multi-cell modular fuel cell stack structure as described in claim 1, characterized in that: The second region (3) is provided with a plurality of fourth support parts (17), which are connected to the support plate (4) and divide the second region (3) into a plurality of air channel units (20) through the plurality of fourth support parts (17).

9. The multi-cell modular stack structure as described in claim 1, characterized in that: The first region (2) is connected to a gas storage chamber (20) at its end, and a multi-stage gas buffer section (21) is provided between the first region (2) and the gas storage chamber (20).

10. A fuel cell stack, characterized in that, It includes the multi-cell stack structure as described in any one of claims 1-9.

11. A power generation system, characterized in that, It includes a fuel cell stack, which includes the multi-cell modular fuel cell stack structure as described in claims 1-9.

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