A stack module for improving fuel utilization

Abstract

The application provides a fuel utilization rate improving electric pile module, which comprises a plurality of primary battery groups and a plurality of secondary battery groups; the primary battery groups and the secondary battery groups are alternately stacked; a primary air inlet channel, a primary air outlet channel, a secondary air inlet channel and a secondary air outlet channel are arranged through the primary battery groups and the secondary battery groups; the air inlet of the primary battery group is arranged in the primary air inlet channel, and the air outlet is arranged in the primary air outlet channel; the air inlet of the secondary battery group is arranged in the secondary air inlet channel, and the air outlet is arranged in the secondary air outlet channel; the electric pile module further comprises a communication channel; the communication channel comprises an air inlet channel, a gas collection channel and an air outlet channel; the air inlet channel is used for connecting an air inlet device and the primary air inlet channel; the gas collection channel is used for connecting the primary air outlet channel and the secondary air inlet channel; and the air outlet channel is used for connecting the secondary air outlet channel and the outside atmosphere; the structure effectively improves the large temperature difference in the electric pile module and reduces the thermal stress in the electric pile module.

Description

Technical Field

[0001] This invention relates to the field of fuel cell technology, and in particular to a fuel cell stack module that improves fuel utilization. Background Technology

[0002] Solid oxide fuel cells (SOFCs) are power generation devices that use electrolytes to convert the chemical energy in fuel into electrical energy. They are characterized by high efficiency, low emissions, and strong fuel adaptability, making them particularly suitable for continuous operation and combined heat and power (CHP) scenarios.

[0003] To improve the power generation, efficiency, and fuel utilization of fuel cell systems and stacks, most existing stack modules operate in a cascaded configuration. This type of stack module includes a primary, secondary, and even tertiary battery pack. The process is as follows: Gas is pumped into the inlet of the primary cell via an intake device. After reaction within the primary battery pack, the primary fuel gas is discharged from its outlet and enters the inlet of the secondary battery pack. This primary fuel gas then reacts within the secondary battery pack, and the secondary fuel gas is discharged from its outlet and then fed into the inlet of the tertiary battery pack. In other words, the lower-level battery packs continue to generate electricity using the residual fuel discharged from the upper-level battery packs. This design significantly improves the overall fuel utilization and power generation efficiency of the stack module system.

[0004] However, in actual use, after the upper-level battery pack finishes operating, the exhaust gas emitted from its outlet has a high temperature. This causes the next-level battery pack to absorb this high-temperature exhaust gas, resulting in a higher overall temperature for the next-level battery pack compared to the upper-level battery pack. This creates a significant temperature difference between the different battery packs within the fuel cell stack module. This temperature difference increases the internal thermal stress of the fuel cell stack module, reducing its lifespan and operational stability. Summary of the Invention

[0005] The main objective of this invention is to propose a fuel cell stack module that improves fuel utilization, aiming to solve the problem of large temperature differences between different stages of the fuel cell stack when using a cascaded structure in existing fuel cell stack modules.

[0006] To achieve the above objectives, the battery stack module proposed in this invention includes several primary battery packs and several secondary battery packs; the primary battery packs and secondary battery packs are stacked alternately; a primary air inlet channel, a primary air outlet channel, a secondary air inlet channel, and a secondary air outlet channel are provided through the primary battery packs and secondary battery packs; the air inlet of the primary battery pack is located in the primary air inlet channel, and the air outlet is located in the primary air outlet channel; the air inlet of the secondary battery pack is located in the secondary air inlet channel, and the air outlet is located in the secondary air outlet channel. The fuel cell stack module also includes a connecting gas path, which includes an inlet gas path, a collecting gas path, and an outlet gas path. The inlet gas path is used to connect the inlet device and the primary inlet gas path. The collecting gas path connects the primary outlet gas path and the secondary inlet gas path. The outlet gas path connects the secondary outlet gas path and the outside atmosphere.

[0007] In one embodiment of the present invention, the line connecting the primary air intake channel, the primary air outlet channel, the secondary air intake channel, and the secondary air outlet channel is a quadrilateral; the primary air intake channel and the secondary air outlet channel, and the primary air outlet channel and the secondary air intake channel are respectively disposed on a set of opposite sides of the quadrilateral.

[0008] In one embodiment of the present invention, the quadrilateral is a rectangle.

[0009] In one embodiment of the present invention, the fuel cell stack module further includes a gas distribution plate, which includes a distribution plate body; The inlet air passage, the collecting air passage, and the outlet air passage are all located on the distribution plate body; The two ends of the gas collecting channel are located in the same vertical plane as the primary outlet channel and the secondary inlet channel, respectively.

[0010] In one embodiment of the present invention, the end of the outlet air passage that is away from the secondary outlet air passage extends toward the direction of the collecting air passage.

[0011] In one embodiment of the present invention, the gas distribution plate further includes a first cover plate and a second cover plate respectively disposed on the upper and lower sides of the distribution plate body and both disposed parallel to the distribution plate body. The fuel cell stack module also includes a clamping device that applies a clamping force to the second cover plate, pressing it against the primary battery pack; When the parts are pressed into place, the side wall of the first cover plate facing the distribution plate body and the side wall of the second cover plate facing the distribution plate body, together with the inlet air passage, the collecting air passage and the outlet air passage, respectively, form the inlet air passage cavity, the collecting air passage cavity and the outlet air passage cavity.

[0012] In one embodiment of the present invention, the first cover plate is provided with a plurality of through holes, which are respectively connected to the inlet air passage and the first-level inlet air passage, the collecting air passage and the first-level outlet air passage, the collecting air passage and the second-level inlet air passage, and the second-level outlet air passage and the outlet air passage. The second cover plate has an air inlet and an exhaust outlet; the air inlet connects to the air intake device and the air intake channel, and the exhaust outlet connects to the air outlet channel and the outside atmosphere.

[0013] In one embodiment of the present invention, the clamping device includes an adjustment component and a first clamping plate and a second clamping plate respectively disposed on the side of the secondary battery pack and the gas distribution plate that are far apart from each other; the adjustment component is used to adjust the clamping force between the first clamping plate and the second clamping plate.

[0014] In one embodiment of the present invention, there are several distribution plate bodies, which are arranged in parallel with each other, and the air inlet channel, the air collecting channel and the air outlet channel on the distribution plate body are all connected to each other.

[0015] In one embodiment of the present invention, the primary battery pack includes N primary single battery cells, and the secondary battery pack includes M secondary single battery cells, wherein N > M.

[0016] This invention provides a fuel cell stack module that improves fuel utilization. By arranging the primary and secondary battery packs in an alternating stacking structure, the temperature between the primary and secondary battery packs is balanced, avoiding the phenomenon of high-temperature and low-temperature zones within the stack module caused by concentrated emissions of high-temperature exhaust gases. This structure greatly balances the temperature field within the stack module, reduces the temperature difference between each battery pack, significantly minimizes localized thermal unevenness within the stack module, thereby reducing thermal stress and improving the long-term operational stability of the stack module.

[0017] Meanwhile, based on the stacked arrangement of the primary and secondary battery packs, by setting the air inlet and outlet of the primary battery pack, the air inlet and outlet of the secondary battery pack, and the air outlet of the secondary battery pack in the primary air inlet channel, the primary air outlet channel, the secondary air inlet channel, and the secondary air outlet channel respectively, it is ensured that the gas entering the primary battery pack will not be accidentally drawn into the secondary battery pack, and the gas flow path strictly follows the reaction completion of the primary battery pack before entering the secondary battery pack, thereby greatly improving the fuel utilization rate. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 A schematic diagram of the stacked structure of the primary battery pack and the secondary battery pack in the fuel stack module for improving fuel utilization provided by the present invention; Figure 2 Structural diagrams of the primary inlet gas flow channel and the secondary outlet gas flow channel in the fuel stack module for improving fuel utilization provided by the present invention; Figure 3 for Figure 2 Enlarged view of point A; Figure 4 for Figure 2 Enlarged view of point B; Figure 5Structural diagrams of the primary outlet gas flow channel and the secondary inlet gas flow channel in the fuel stack module for improving fuel utilization provided by the present invention; Figure 6 for Figure 5 Enlarged view of point C; Figure 7 for Figure 5 Enlarged view of point D; Figure 8 An exploded view of the stacked structure of the primary battery pack and the secondary battery pack in the fuel stack module for improving fuel utilization provided by the present invention; Figure 9 A diagram showing the gas flow path within a single primary cell in a fuel cell stack module for improving fuel utilization, as provided by this invention. Figure 10 A diagram showing the gas flow path within a secondary single cell in a fuel cell stack module for improving fuel utilization, as provided by this invention. Figure 11 A structural diagram of the distribution plate in the fuel stack module for improving fuel utilization provided by the present invention; Figure 12 A structural diagram of the distribution plate body in the fuel stack module for improving fuel utilization provided by the present invention; Figure 13 A top view of the first cover plate in the fuel stack module for improving fuel utilization provided by the present invention; Figure 14 A bottom view of the second cover plate in the fuel stack module for improving fuel utilization provided by the present invention; Figure 15 This is an overall structural diagram of the fuel cell stack module for improving fuel utilization provided by the present invention.

[0020] The components include: 1. Primary battery pack; 10. Primary single cell; 101. Primary single cell air inlet; 102. Primary single cell air outlet; 2. Secondary battery pack; 20. Secondary single cell; 201. Secondary single cell air inlet; 202. Secondary single cell air outlet; 301. Primary air inlet channel; 302. Primary air outlet channel; 401. Secondary air inlet channel; 402. Secondary air outlet channel; 5. Gas separator. 50. First cover plate; 500. Through hole; 51. Distribution plate body; 510. Inlet air passage; 511. Collecting air passage; 512. Outlet air passage; 5120. Horizontal end; 5121. Vertical end; 52. Second cover plate; 520. Air inlet; 521. Discharge outlet; 6. Clamping device; 60. Adjustment component; 600. Screw; 601. Locking nut; 61. First clamping plate; 62. Second clamping plate.

[0021] The objectives, features, and advantages of this invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0023] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0024] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0025] In response to the problems raised in the background art, this invention proposes a fuel cell stack module to improve fuel utilization, aiming to solve the problem of large temperature differences between different stages of the fuel cell stack in the prior art.

[0026] Please see Figure 1 , Figure 2 and Figure 5 In one embodiment of the present invention, the battery stack module includes a plurality of primary battery packs 1 and a plurality of secondary battery packs 2; the primary battery packs 1 and secondary battery packs 2 are stacked alternately; a primary air inlet channel 301, a primary air outlet channel 302, a secondary air inlet channel 401, and a secondary air outlet channel 402 are vertically provided on the primary battery packs 1 and the secondary battery packs 2; the air inlet of the primary battery pack 1 is located in the primary air inlet channel 301, and the air outlet is located in the primary air outlet channel 302; the air inlet of the secondary battery pack 2 is located in the secondary air inlet channel 401, and the air outlet is located in the secondary air outlet channel 402. The fuel cell stack module also includes a connecting gas path, which includes an inlet gas path 510, a collecting gas path 511, and an outlet gas path 512. The inlet gas path 510 is used to connect the inlet device and the primary inlet gas path 301. The collecting gas path 511 connects the primary outlet gas path 302 and the secondary inlet gas path 401. The outlet gas path 512 connects the secondary outlet gas path 402 and the outside atmosphere.

[0027] In existing fuel cell stack modules, a temperature difference exists between the lower-level battery packs and the upper-level battery packs due to the absorption of heat from the exhaust gas of the upper-level battery packs. This application addresses this issue by designing the primary battery pack 1 and the secondary battery pack 2 in an alternating stacking structure to balance the temperature difference between them. This design significantly balances the temperature field within the fuel cell stack module, reduces the temperature difference between each battery pack, and greatly minimizes localized uneven heating and cooling within the fuel cell stack module. This, in turn, reduces thermal stress within the fuel cell stack module and improves its long-term operational stability.

[0028] Among them, such as Figure 8 As shown, the primary battery pack 1 includes N primary single-cell cells 10, and the secondary battery pack 2 includes M secondary single-cell cells 20, where N > M. That is, the number of primary single-cell cells 10 in the primary battery pack 1 must be greater than the number of secondary single-cell cells 20 in the secondary battery pack 2. Because the fuel gas entering the primary battery pack 1 is relatively abundant, a sufficient number of primary single-cell cells 10 can handle the main power generation load. The fuel gas entering the secondary battery pack 2 contains less fuel, so a smaller number of secondary single-cell cells 20 are sufficient to handle the exhaust gas reuse load. This design improves fuel utilization and avoids damage to the secondary battery pack 2 due to insufficient fuel in the exhaust gas of the primary battery pack 1, making the operation of the fuel cell stack module more stable and reliable.

[0029] Please refer to Figure 3 , Figure 4 , Figure 6 and Figure 7 During operation, the air intake device delivers gas to the primary air intake channel 301 through the air intake channel 510. The gas enters the primary single cell 10 through the primary single cell inlet 101 and reacts inside. It is then discharged from the primary single cell outlet 102 and flows back to the collecting channel 511 through the primary outlet channel 302. Subsequently, it enters the secondary air intake channel 401, enters the secondary single cell 20 through the secondary single cell inlet 201 in the secondary battery pack 2 and reacts inside. It is then discharged from the secondary single cell outlet 202 and flows back to the outlet channel 512 through the secondary outlet channel 402.

[0030] Among them, multiple primary single cell air inlets 101 form a primary air intake channel 301, and multiple primary single cell air outlets 102 form a primary air outlet channel 302; multiple secondary single cell air inlets 201 form a secondary air intake channel 401, and multiple secondary single cell air outlets 202 form a secondary air outlet channel 402.

[0031] Understandably, the primary single cell air inlet 101, the primary single cell air outlet 102, the secondary single cell air inlet 201, and the secondary single cell air outlet 202 are not on the air side and are not connected to each other, so that the gas that is to enter the primary battery pack 1 will not enter the secondary battery pack 2.

[0032] Preferably, such as Figure 9 As shown, the lines connecting the primary intake channel 301, the primary outlet channel 302, the secondary intake channel 401, and the secondary outlet channel 402 form a quadrilateral, that is, the lines connecting the primary single cell inlet 101, the primary single cell outlet 102, the secondary single cell inlet 201, and the secondary single cell outlet 202 form a quadrilateral; the primary intake channel 301 and the secondary outlet channel 402, and the primary outlet channel 302 and the secondary intake channel 401 are respectively arranged on a set of opposite sides of the quadrilateral, that is, the primary single cell inlet 101 and the secondary single cell outlet 202 are located on the same side of the quadrilateral, and the secondary single cell inlet 201 and the primary single cell outlet 102 are arranged on another opposite side of the quadrilateral.

[0033] Understandably, such as Figure 10 As shown, the internal structure of the secondary single cell 20 is symmetrically arranged with the internal structure of the primary single cell 10.

[0034] Preferably, the primary air inlet channel 301, the primary air outlet channel 302, the secondary air inlet channel 401, and the secondary air outlet channel 402 are respectively located at the four corners of the single cell and the secondary single cell. This is highly compatible with the shape of conventional square and rectangular single cells, facilitating processing and sealing.

[0035] Understandably, this setting can be adapted to the shape of the conventional primary single cell 10 and secondary single cell 20 in practice.

[0036] Preferably, such as Figure 11 As shown, the fuel cell stack module also includes a gas distribution plate 5. The gas distribution plate 5 includes a distribution plate body 51 and a first cover plate 50 and a second cover plate 52 respectively disposed on the upper and lower sides of the distribution plate body 51 and both disposed parallel to the distribution plate body 51. Among them, such as Figures 12 to 14As shown, the inlet air passage 510, the collecting air passage 511, and the outlet air passage 512 are all located on the distribution plate body 51. When the parts are pressed into place, the side wall of the first cover plate 50 facing the distribution plate body 51 and the side wall of the second cover plate 52 facing the distribution plate body 51, together with the inlet air passage 510, the collecting air passage 511 and the outlet air passage 512, respectively, form the inlet air passage 510 cavity, the collecting air passage 511 cavity and the outlet air passage 512 cavity.

[0037] The second cover plate 52 is provided with an air inlet 520 and an exhaust outlet 521; the air inlet 520 is connected to the air intake device and the air intake channel 510, and the exhaust outlet 521 is connected to the air outlet channel 512 and the outside atmosphere.

[0038] The air inlet 520 is located in the middle of the second cover plate 52. The air inlet 520 and the air inlet end of the air intake channel 510 are located in the same vertical plane. The air outlet end of the air intake channel 510 extends away from the end of the collecting channel 511 and the outlet channel 512. The air inlet end of the air intake channel 510 and the first-stage air intake channel 301 are located in the same vertical plane. After the external gas enters the air intake channel 510 vertically from the middle of the second cover plate 52, it is transported along the air intake channel 510 to the gas inlet of each first-stage battery cell. This not only makes the gas distribution between the first-stage battery cells more uniform, but also effectively shortens the path difference of the gas to the far-end first-stage battery cell, improves the power generation consistency of the first-stage battery pack 1, and has good practicality.

[0039] Furthermore, the first cover plate 50 is provided with multiple through holes, specifically, such as... Figure 13 As shown, there are four through holes. The four through holes are respectively connected to the inlet air passage 510 and the primary inlet air passage 301, the collecting air passage 511 and the primary outlet air passage 302, the collecting air passage 511 and the secondary inlet air passage 401, and the secondary outlet air passage 402 and the outlet air passage 512. This realizes the orderly guidance of the entire process of gas from the inlet 520 to the inlet air passage 510, to the primary inlet air passage 301, to the primary outlet air passage 302, to the collecting air passage 511, to the secondary inlet air passage 401, to the secondary outlet air passage 402, to the outlet air passage 512, and finally to the gas outlet. This avoids the gas that needs to enter the primary battery pack 1 from entering the secondary battery pack 2 and reacting, which greatly improves the gas utilization rate.

[0040] The gas collecting channel 511 is arranged parallel to one side of the distribution plate body 51, and the two ends of the gas collecting channel 511 are located in the same vertical plane as the primary outlet gas channel 302 and the secondary inlet gas channel 401, respectively. The straight arrangement of the gas collecting channel 511 shortens the transfer path of the primary exhaust gas into the secondary single cell, reduces path bends and resistance losses, and ensures the power generation efficiency of the secondary single cell 20.

[0041] The air inlet of the outlet duct 512 is connected to the secondary outlet duct 402, and the outlet is connected to the outside atmosphere through the gas outlet on the second cover plate 52. The end of the outlet duct 512 away from the secondary outlet duct 402 extends towards the collecting duct 511.

[0042] Specifically, such as Figure 12 As shown, the outlet gas duct 512 first extends towards the direction of the inlet gas duct 510 and the gas collection flow, then extends horizontally towards the gas collection duct 511, and then is vertically arranged parallel to the gas collection duct 511. The discharge port 521 is located at the end of the vertical end 5121 away from the horizontal end 5120. The extended arrangement of the outlet gas duct 512 helps the exhaust gas to be buffered and dissipated within the outlet gas duct 512, further balancing the internal temperature field of the distribution plate body 51, avoiding the formation of local overheating areas within the outlet gas duct 512 due to concentrated exhaust gas emission, and further reducing the temperature difference and thermal stress of the overall fuel cell stack module.

[0043] like Figure 15 As shown, the battery stack module also includes a clamping device 6 that applies a clamping force to the second cover plate 52 to press it against the primary battery pack 1; the clamping device 6 includes an adjustment component 60 and a first clamping plate 61 and a second clamping plate 62 respectively disposed on the side of the secondary battery pack 2 and the gas distribution plate 5 that are far apart from each other. The first clamping plate 61 and the second clamping plate 62 are arranged parallel to each other, and the adjustment component 60 is used to adjust the clamping force between the first clamping plate 61 and the second clamping plate 62.

[0044] The adjusting assembly 60 comprises a screw 600 and a locking nut 601. The screw 600 is perpendicular to the first abutment plate 61 and passes through both the first abutment plate 61 and the second abutment plate 62. The locking nut 601 is fitted onto the screw 600 from the side of the second abutment plate 62 away from the first abutment plate 61. The depth of the locking nut on the screw 600 is adjusted to regulate the clamping force between the first cover plate 50, the distribution plate body 51, the second cover plate 52, and the primary battery pack 1 and the secondary battery pack 2, thus ensuring the proper functioning of the air intake passage 510 cavity. The gas collecting channel 511 and the gas venting channel 512 maintain high sealing performance under high-temperature operating conditions, while also ensuring the sealing performance of the primary gas inlet channel 301, the primary gas outlet channel 302, the secondary gas inlet channel 401, and the secondary gas outlet channel 402. This effectively prevents gas from crossing between the channels or leaking to the outside, ensuring that the gas flows through the primary battery pack 1 and the secondary battery pack 2 in strict accordance with the preset path, avoiding the waste caused by insufficient fuel reaction due to gas leakage, and further improving fuel utilization and power generation efficiency.

[0045] Understandably, the specific implementation of the adjusting component 60 is not limited to the combination of the screw 600 and the locking nut 601. Any structure capable of applying opposing clamping forces to the first clamping plate 61 and the second clamping plate 62 can be used as an equivalent alternative to this solution. For example, a clamping mechanism driven by a hydraulic cylinder or a pneumatic cylinder can be used, directly pushing the two clamping plates together through the extension and retraction of the cylinder; a cam-linkage locking mechanism can also be used, utilizing the rotation stroke of the cam to generate a continuous clamping force. As long as the component can provide a stable and adjustable opposing force, ensuring reliable clamping of each flow channel cavity and sealing interface under high-temperature operating conditions, it can achieve the same sealing and anti-gas leakage effect as the screw and locking nut, thereby ensuring that the gas flows in an orderly manner along the designed path, improving fuel utilization and power generation efficiency. Therefore, the screw 600 and the locking nut 601 are only a preferred embodiment and do not constitute a necessary limitation on the structure of the adjusting component.

[0046] Furthermore, there are several distribution plate bodies 51, which are arranged parallel to each other. The inlet air passage 510, the collecting air passage 511, and the outlet air passage 512 on the distribution plate body 51 are all interconnected. Multiple gas distribution plates 51 can make the cavity size of the inlet air passage 510, the collecting air passage 511, and the outlet air passage 512 larger, thus achieving a better flow uniformity effect.

[0047] It should be noted that the use of a gas distribution plate 5 to connect the primary intake channel 301, the primary outlet channel 302, the secondary intake channel 401, and the secondary outlet channel 402 in this embodiment is only a preferred embodiment of the present invention and not the only limitation on the above-mentioned channel connection method. Any structure that can achieve the same airflow guiding function is within the scope of protection of the present invention. For example, a high-temperature resistant pipe can be used to connect the primary outlet channel 302 and the secondary intake channel 401, allowing the exhaust gas from the reaction in the primary battery pack 1 to be transported to the secondary battery pack 2 via an external pipe for secondary reaction. Simultaneously, connecting the primary intake channel 301 to an external gas pipeline and the secondary outlet channel 402 to an exhaust gas emission pipeline can also achieve the technical effect of cascade utilization of gas and improved fuel utilization. Those skilled in the art should understand that regardless of whether a distribution plate or a pipe connection method is used, as long as the core function of collecting and transporting the primary exhaust gas to the secondary battery pack 2 for reuse can be achieved, it should be considered equivalent to the present invention.

[0048] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A fuel cell stack module for improving fuel utilization, characterized in that, It includes several primary battery packs and several secondary battery packs; the primary battery packs and the secondary battery packs are stacked alternately; each primary battery pack and each secondary battery pack is provided with a primary air inlet channel, a primary air outlet channel, a secondary air inlet channel, and a secondary air outlet channel; the air inlet of each primary battery pack is connected to the primary air inlet channel, and the air outlet of each primary battery pack is connected to the primary air outlet channel; the air inlet of each secondary battery pack is connected to the secondary air inlet channel, and the air outlet of each secondary battery pack is connected to the secondary air outlet channel. The fuel cell stack module also includes a connecting gas path, which includes an inlet gas path, a collecting gas path, and an outlet gas path. The inlet gas path connects the inlet device and the primary inlet gas path, the collecting gas path connects the primary outlet gas path and the secondary inlet gas path, and the outlet gas path connects the secondary outlet gas path and the outside atmosphere.

2. The fuel cell stack module for improving fuel utilization as described in claim 1, characterized in that, The line connecting the primary air intake channel, the primary air outlet channel, the secondary air intake channel, and the secondary air outlet channel is a quadrilateral; the primary air intake channel and the secondary air outlet channel, and the primary air outlet channel and the secondary air intake channel are respectively arranged on a pair of opposite sides of the quadrilateral.

3. The fuel cell stack module for improving fuel utilization as described in claim 1, characterized in that, The fuel cell module also includes a gas distribution plate, which includes a distribution plate body. The inlet air passage, the collecting air passage, and the outlet air passage are all located on the distribution plate body; The two ends of the collecting air channel are located in the same vertical plane as the primary outlet air channel and the secondary inlet air channel, respectively.

4. The fuel cell stack module as described in claim 3, characterized in that, The end of the outlet air passage away from the secondary outlet air passage extends toward the collecting air passage.

5. The fuel cell stack module for improving fuel utilization as described in claim 3, characterized in that, The gas distribution plate also includes a first cover plate and a second cover plate respectively disposed on the upper and lower sides of the distribution plate body and both disposed parallel to the distribution plate body; The fuel cell module also includes a clamping device that applies a clamping force in the same direction to the second cover plate, the distribution plate body, and the first cover plate; When the plates are in place, the second cover, the distribution plate body, and the first cover are pressed against the primary battery pack. The side wall of the first cover plate facing the distribution plate body and the side wall of the second cover plate facing the distribution plate body, together with the inlet air passage, the collecting air passage and the outlet air passage, respectively, form the inlet air passage cavity, the collecting air passage cavity and the outlet air passage cavity.

6. The fuel cell stack module for improving fuel utilization as described in claim 5, characterized in that, The first cover plate is provided with a plurality of through holes, which are respectively connected to the air inlet channel and the first-stage air inlet channel, the air collecting channel and the first-stage air outlet channel, the air collecting channel and the second-stage air inlet channel, and the second-stage air outlet channel and the air outlet channel; The second cover plate has an air inlet and an exhaust outlet; the air inlet connects the air intake device and the air intake channel, and the exhaust outlet connects the air outlet channel to the outside atmosphere.

7. The fuel cell stack module for improving fuel utilization as described in claim 6, characterized in that, The clamping device includes an adjustment component and a first clamping plate and a second clamping plate respectively disposed on the side of the secondary battery pack and the gas distribution plate that are far apart from each other; the adjustment component is used to adjust the clamping force between the first clamping plate and the second clamping plate.

8. The fuel cell stack module for improving fuel utilization as described in claim 5, characterized in that, There are several distribution plate bodies, which are arranged in parallel to each other, and the air inlet channel, air collecting channel and air outlet channel on the distribution plate body are all connected to each other.

9. The fuel cell stack module for improving fuel utilization as described in claim 1, characterized in that, The primary battery pack includes N primary single cells, and the secondary battery pack includes M secondary single cells, where N > M.

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