A fuel cell membrane humidifier

Abstract

An embodiment of the present application relates to a fuel cell membrane humidifier, belonging to the technical field of fuel cells, including a humidification main body and a first cover plate. The humidification main body includes a plurality of detachably connected humidification units; each humidification unit is provided with a dry gas inlet channel, a dry gas outlet channel, a humid gas inlet channel, and a humid gas outlet channel; the membrane assembly includes a hollow fiber membrane tube connecting the humid gas inlet channel and the humid gas outlet channel and a membrane bundle frame connecting the humid gas inlet channel and the humid gas outlet channel; the dry gas inlet channels, dry gas outlet channels, humid gas inlet channels, and humid gas outlet channels of the plurality of humidification units correspond to each other and are connected; the first cover plate closes the openings where the respective channels of the humidification main body are exposed on the corresponding sides. The present application can adjust the number of humidification units in the humidification main body to meet the humidity requirements of fuel cell systems in different power ranges, with higher compatibility; and the humidification units can be replaced individually, extending the service life of the product, avoiding waste of materials, and reducing costs.

Description

Technical Field

[0001] This application relates to the technical field of fuel cells, and more particularly, to a fuel cell membrane humidifier. Background Art

[0002] In the context of global energy tension and the "dual carbon" policy, hydrogen fuel cells are considered one of the most promising solutions to address the energy crisis and environmental pollution. Among them, proton exchange membrane fuel cells, as a chemical battery power generation device that converts chemical energy into electrical energy, have the advantages of fast startup speed, zero emissions, no corrosion, high specific power, high electrical efficiency, low noise, and the ability to achieve low-temperature cold startup, and have received extensive attention and applications.

[0003] As the core component of the air supply system in the fuel cell auxiliary system, the membrane humidifier delivers air with a stable flow rate and humidity to the fuel cell engine, and its performance directly affects the performance of the fuel cell system.

[0004] The operating principle of the membrane humidifier is to transfer moisture and heat through a high-performance hollow fiber membrane. The membrane humidifier humidifies the dry air to reach the humidity required by the fuel cell stack, further improving the efficiency and lifespan of the fuel cell system. Currently, the mainstream membrane humidifiers on the market are composed of a plastic housing assembled with several membrane modules, and the housing and membrane modules are encapsulated into one body with potting glue. Each membrane module includes several hollow fiber membranes.

[0005] In the process of implementing this application, the inventors found that there are at least the following problems in the prior art: the structure of current membrane humidifier products is relatively fixed, making it difficult to meet the requirements of fuel cell systems with different power ranges, and having poor compatibility. Moreover, the membrane humidifier has problems such as performance degradation, internal leakage, external leakage, high cost, and low compatibility after long-term operation of the membrane tube. Once the performance of the membrane humidifier fails to meet the requirements of the fuel cell system, the entire membrane humidifier can only be scrapped, resulting in great waste. Summary of the Invention

[0006] The embodiments of this application provide a fuel cell membrane humidifier, aiming to solve the technical problems that the existing membrane humidifiers are difficult to meet the requirements of fuel cell systems with different power ranges and have poor compatibility.

[0007] The embodiments of this application provide a fuel cell membrane humidifier, including a humidifying main body, the humidifying main body includes a plurality of humidifying units, and any two adjacent humidifying units are detachably connected;

[0008] The humidifying unit includes a unit housing and a membrane module, and the unit housing includes a dry gas inlet channel, a dry gas outlet channel, a wet gas inlet channel, and a wet gas outlet channel;

[0009] The membrane module includes a hollow fiber membrane tube and a membrane bundle frame that cooperate with each other. The membrane bundle frame communicates with the wet gas inlet channel and the wet gas outlet channel, and both ends of the hollow fiber membrane tube communicate with the dry gas inlet channel and the dry gas outlet channel;

[0010] In the humidification main body, the dry gas inlet channels, dry gas outlet channels, wet gas inlet channels, and wet gas outlet channels of the multiple humidification units correspond to each other one by one and are communicated;

[0011] The membrane humidifier further includes a first cover plate disposed on one side of the humidification main body, and the cover plate closes the openings of the respective channels of the humidification main body exposed on the corresponding side.

[0012] Optionally, the membrane humidifier further includes a second cover plate disposed on the other side of the humidification main body. A dry gas inlet, a dry gas outlet, a wet gas inlet, and a wet gas outlet are provided on the second cover plate. The dry gas inlet is communicated with the dry gas inlet channel, the dry gas outlet is communicated with the dry gas outlet channel, the wet gas inlet is communicated with the wet gas inlet channel, and the wet gas outlet is communicated with the wet gas outlet channel.

[0013] Optionally, the humidification unit, the first cover plate, and the second cover plate are all provided with a plurality of positioning holes;

[0014] The positioning holes of the first cover plate, the second cover plate, and the multiple humidification units correspond to each other one by one and are communicated. A positioning rod is inserted through each group of corresponding positioning holes, and the diameter of the positioning rod is adapted to that of the positioning hole;

[0015] Nuts are threadedly connected to both ends of the positioning rod, and the nuts squeeze the first cover plate and the second cover plate.

[0016] Optionally, a sealing member is provided between the first cover plate and the adjacent humidification unit;

[0017] A sealing member is provided between the second cover plate and the adjacent humidification unit.

[0018] Optionally, a sealing member is provided between adjacent humidification units.

[0019] Optionally, the sealing member includes a dry gas inlet sealing ring, a dry gas outlet sealing ring, and a wet gas sealing ring;

[0020] The dry gas inlet sealing ring surrounds the dry gas inlet channel; the dry gas outlet sealing ring surrounds the dry gas outlet channel; the wet gas sealing ring surrounds both the wet gas inlet channel and the wet gas outlet channel at the same time.

[0021] Optionally, the seal further includes an external leakage seal ring, which surrounds the dry gas inlet seal ring, the dry gas outlet seal ring, and the wet gas seal ring at the same time.

[0022] Optionally, the surface of the unit housing is provided with a placement groove for placing each seal ring.

[0023] Optionally, an internal through cavity is provided in the unit housing, and the internal through cavity is sequentially communicated with the dry gas inlet channel, the wet gas outlet channel, the wet gas inlet channel, and the dry gas outlet channel;

[0024] The membrane bundle frame is installed in the internal through cavity, and moisture inlet and outlet windows are provided at the positions of the frame body of the membrane bundle frame corresponding to the wet gas outlet channel and the wet gas inlet channel.

[0025] Optionally, the end of the membrane bundle frame is potted with potting glue, a sealant is provided outside the potting glue, the sealant is covered with a sealant cover plate, and the sealant cover plate is connected to the unit housing.

[0026] In an embodiment of the present application, a fuel cell membrane humidifier is provided, which is provided with a humidification main body. The humidification main body includes a plurality of humidification units, and any two adjacent humidification units are detachably connected. Thus, the humidification units in the humidification main body can be disassembled and assembled, and further, the number of humidification units in the humidification main body can be adjusted. When using the membrane humidifier, the number of humidification units in the membrane humidifier is adjusted according to the humidity requirement of the fuel cell system power section. By increasing or decreasing the number of humidification units, the humidification capacity of the membrane humidifier can be adjusted. By setting the number of different humidification units, the humidity requirements of fuel cell systems in different power sections can be met, and the compatibility is higher; moreover, if an individual humidification unit is damaged (such as problems like membrane tube performance attenuation, internal leakage, external leakage, etc.), the humidification unit can be replaced separately, which prolongs the service life of the product, avoids waste of materials, and further reduces costs. Description of the Drawings

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments of the present application will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0028] Figure 1 is a three-dimensional schematic diagram of a humidification unit proposed in an embodiment of the present application;

[0029] Figure 2 is a front view schematic diagram of a humidification unit proposed in an embodiment of the present application;

[0030] Figure 3 It is a three-dimensional schematic diagram of a fuel cell membrane humidifier proposed in an embodiment of the present application;

[0031] Figure 4 It is an exploded schematic diagram of a fuel cell membrane humidifier proposed in an embodiment of the present application.

[0032] Description of the reference numerals:

[0033] 1 - humidifying unit, 11 - unit housing, 111 - dry gas inlet channel, 112 - dry gas outlet channel, 113 - humid gas inlet channel, 114 - humid gas outlet channel, 115 - dry gas inlet sealing ring placement groove, 116 - dry gas outlet sealing ring placement groove, 117 - humid gas sealing ring placement groove, 12 - membrane assembly, 121 - membrane bundle frame, 122 - humid gas inlet and outlet window, 13 - potting adhesive, 14 - sealant, 15 - sealant cover plate, 2 - first cover plate, 3 - second cover plate, 31 - dry gas inlet, 32 - dry gas outlet, 33 - humid gas inlet, 34 - humid gas outlet, 41 - dry gas inlet sealing ring, 42 - dry gas outlet sealing ring, 43 - humid gas sealing ring, 5 - positioning rod. Detailed implementation manners

[0034] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0035] The terms "first" and "second" in the specification and claims of the present application may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise specified, the meaning of "a plurality" is two or more.

[0036] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "length", "upper", "lower", "inner", "outer", "circumferential", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0037] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "linkage" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0038] In the related art, a membrane humidifier transfers moisture and heat through a high-performance hollow fiber membrane. Specifically, a gas with a higher humidity (i.e., wet gas) flows outside the high-performance hollow fiber membrane tube, and a gas with a lower humidity (i.e., dry gas) flows inside the high-performance hollow fiber membrane tube. The moisture in the external wet gas is transferred to the internal dry gas through the high-performance hollow fiber membrane tube, thereby humidifying the dry air to make it reach the humidity required by the fuel cell stack, and further improving the efficiency and lifespan of the fuel cell system.

[0039] Currently, the mainstream membrane humidifiers on the market are composed of a specific plastic housing assembled with several membrane modules, and the housing and the membrane modules are encapsulated into one body through potting glue. Each membrane module includes several hollow fiber membranes. Due to its fixed structure, it cannot meet the requirements of fuel cell systems with different power segments at the same time, and its compatibility is poor. The main problems of current membrane humidifier products include performance degradation, internal leakage, external leakage, high cost, and low compatibility after long-term operation of the membrane tube. Once the product performance fails to meet the requirements of the fuel cell system, the product can only be scrapped, resulting in great waste.

[0040] To address these problems, the present application provides a novel fuel cell membrane humidifier with adjustable performance. By setting different numbers of standard units, the humidity requirements of fuel cell systems with different power segments can be met. Additionally, if there are problems such as performance degradation and internal leakage in the membrane tubes of individual humidifying units, they can be replaced separately, extending the service life of the product, avoiding waste of materials, and further reducing costs.

[0041] The following combines Figures 1 - 4 to describe a fuel cell membrane humidifier proposed in an embodiment of the present application.

[0042] As Figures 1 - 2 shown, the fuel cell membrane humidifier includes a humidifying main body, and the humidifying main body includes a plurality of humidifying units 1. Any two adjacent humidifying units 1 are detachably connected, whereby the humidifying units 1 in the humidifying main body can be disassembled and assembled, and thus the number of humidifying units 1 in the humidifying main body can be adjusted.

[0043] The humidifying unit 1 includes a unit housing 11 and a membrane assembly 12. The unit housing 11 includes a dry gas inlet passage 111, a dry gas outlet passage 112, a humid gas inlet passage 113, and a humid gas outlet passage 114. The two ends of the dry gas inlet passage 111, the dry gas outlet passage 112, the humid gas inlet passage 113, and the humid gas outlet passage 114 are respectively exposed on both sides of the unit housing 11.

[0044] The membrane assembly 12 includes a hollow fiber membrane tube and a membrane bundle frame 121 that cooperate with each other. The hollow fiber membrane tube passes through the membrane bundle frame 121. The membrane bundle frame 121 communicates with the humid gas inlet passage 113 and the humid gas outlet passage 114. The two ends of the hollow fiber membrane tube communicate with the dry gas inlet passage 111 and the dry gas outlet passage 112. Among them, in a single humidifying unit 1, the dry gas input from the dry gas inlet passage 111 can be output from the dry gas outlet passage 112 after passing through the hollow fiber membrane tube, and the humid gas input from the humid gas inlet passage 113 can be output from the humid gas outlet passage 114 after passing through the membrane bundle frame 121, thereby realizing the humidification of the dry gas.

[0045] As Figure 4 shown, in the humidifying main body, the dry gas inlet passages 111, the dry gas outlet passages 112, the humid gas inlet passages 113, and the humid gas outlet passages 114 of multiple humidifying units 1 correspond to each other and are communicated; the membrane humidifier further includes a first cover plate 2 provided on one side of the humidifying main body, and the cover plate closes the openings of each channel of the humidifying main body exposed on the corresponding side.

[0046] Based on this, when using the membrane humidifier, the humidifying main body is adjusted according to the humidity requirement of the fuel cell system power section, that is, the humidifying units 1 in the humidifying main body are disassembled and assembled to adjust the number of humidifying units 1 in the membrane humidifier.

[0047] Specifically, an appropriate number of humidifying units 1 are selected according to the humidity requirement of the fuel cell system power section, and the corresponding number of humidifying units 1 are assembled together to form the required humidifying main body, so that the corresponding channels of all humidifying units 1 are sequentially communicated to form multiple channels running through the entire humidifying main body.

[0048] On the basis of forming the above-mentioned multiple channels, a first cover plate 2 is arranged on one side of the humidifying main body, and the openings on the corresponding sides of the dry gas inlet channel 111, the dry gas outlet channel 112, the humid gas inlet channel 113, and the humid gas outlet channel 114 are closed by the first cover plate 2; at this time, dry gas is input from the front end of the dry gas inlet channel 111, the dry gas enters the entire dry gas inlet channel 111, the dry gas passes through the hollow fiber membrane tubes of all the humidifying units 1 and then enters the dry gas outlet channel 112, and is output from the front end of the dry gas outlet channel 112; humid gas is input from the front end of the humid gas inlet channel 113, the humid gas enters the entire humid gas inlet channel 113, the humid gas passes through the membrane bundle frames 121 of all the humidifying units 1 and then enters the humid gas outlet channel 114, and is output from the front end of the humid gas outlet channel 114, thereby completing the humidification of the dry gas under the action of the membrane assemblies 12 of all the humidifying units 1.

[0049] It can be seen from this that each humidifying unit 1 in the humidifying main body is a functional component for humidifying the membrane humidifier, and the humidifying ability of the membrane humidifier can be adjusted by increasing or decreasing the number of humidifying units 1. By setting the number of different humidifying units 1, the humidity requirements of fuel cell systems in different power ranges can be met, and the compatibility is higher; moreover, if an individual humidifying unit 1 is damaged (such as problems such as attenuation of membrane tube performance, internal leakage, and external leakage), the humidifying unit 1 can be replaced separately, which prolongs the service life of the product, avoids waste of materials, and further reduces costs.

[0050] Among them, the membrane bundle frame 121 is a hollow columnar structure, and a plurality of hollow fiber membrane tubes (not shown in the figure) are filled inside it. The hollow fiber membrane tubes pass through the membrane bundle frame 121 along the direction parallel to the length direction of the membrane bundle frame 121 and are restricted by the membrane bundle frame 121. The cooperation mode between the membrane bundle frame 121 and the hollow fiber membrane tubes is the prior art, and its structure and principle will not be elaborated here.

[0051] Among them, the shape of the unit housing 11 can be a cube, a cuboid, or a cylinder.

[0052] Such as Figures 3 - 4 As shown, in a feasible implementation manner, the humidifier further includes a second cover plate 3 arranged on the other side of the humidifying main body. The second cover plate 3 is provided with a dry gas inlet 31, a dry gas outlet 32, a humid gas inlet 33, and a humid gas outlet 34. The dry gas inlet 31 is communicated with the dry gas inlet channel 111 of the humidifying main body, the dry gas outlet 32 is communicated with the dry gas outlet channel 112 of the humidifying main body, the humid gas inlet 33 is communicated with the humid gas inlet channel 113 of the humidifying main body, and the humid gas outlet 34 is communicated with the humid gas outlet channel 114 of the humidifying main body.

[0053] Among them, the dry gas inlet 31, the dry gas outlet 32, the humid gas inlet 33, and the humid gas outlet 34 are used to connect with the gas transmission pipelines to complete the input and discharge of dry and humid gases.

[0054] Among them, the shapes of the dry gas inlet 31, the dry gas outlet 32, the wet gas inlet 33, and the wet gas outlet 34 can be circular, and the sizes are between 50 and 100 mm.

[0055] For two adjacent humidifying units 1, they can be detachably connected. The detachable connection can be such that the adjacent humidifying units 1 are directly detachably connected, for example, a required number of humidifying units 1 are sequentially installed together in a snap-fit or riveting form; or it can be such that the adjacent humidifying units 1 are indirectly detachably connected, for example, a required number of humidifying units 1 are stacked together, and other components are used to squeeze the two sides of the stacked humidifying units 1 so that all the humidifying units 1 are tightly abutted together.

[0056] In a feasible implementation manner, it can be that the two sides of the stacked humidifying units 1 are squeezed by the first cover plate 2 and the second cover plate 3 so that all the humidifying units 1 are tightly abutted together.

[0057] Furthermore, the humidifying unit 1, the first cover plate 2, and the second cover plate 3 can be connected by bolts.

[0058] Furthermore, as Figures 3 - 4 shown, the humidifying unit 1, the first cover plate 2, and the second cover plate 3 can all be provided with a plurality of positioning holes; among them, the positioning holes of the first cover plate 2, the second cover plate 3, and the plurality of humidifying units 1 correspond one by one and are communicated, and each group of corresponding positioning holes is penetrated by a positioning rod 5. The diameter of the positioning rod 5 is adapted to the positioning hole, which is convenient for aligning and communicating the four channels of all the humidifying units 1, ensuring the structural stability of the membrane humidifier, and reducing air leakage caused by misalignment between the channels.

[0059] Both ends of the positioning rod 5 have threads, and nuts are respectively threadedly connected to both ends of the positioning rod 5. The nuts located at both ends of the positioning rod 5 are tightened and respectively squeeze the first cover plate 2 and the second cover plate 3, so that the first cover plate 2, the second cover plate 3, and all the humidifying units 1 are tightly abutted. Thus, the detachable connection of any two adjacent humidifying units 1 can be realized through the cooperation of the first cover plate 2, the second cover plate 3, the positioning rod 5, and the nuts.

[0060] Furthermore, as Figures 3 - 4 shown, positioning holes can be opened at the end face edges of the first cover plate 2, the second cover plate 3, and the humidifying unit 1 respectively. At least one positioning hole is opened at each edge, preferably a plurality of positioning holes. All the positioning holes on each component (the component can be the humidifying unit 1, the first cover plate 2, or the second cover plate 3) are circumferentially distributed outside the seal ring group. By simultaneously passing the positioning rod 5 through the corresponding positioning holes of the first cover plate 2, the second cover plate 3, and the humidifying unit 1 and tightening, the first cover plate 2, the second cover plate 3, and the humidifying unit 1 are tightly contacted, thereby improving the sealing effect of the seal ring.

[0061] In a feasible implementation, a seal is provided between adjacent humidifying units 1. The seal surrounds the dry gas inlet passage 111, the dry gas outlet passage 112, the humid gas inlet passage 113, and the humid gas outlet passage 114 between adjacent humidifying units 1. Through the arrangement of the seal, leakage of dry gas or humid gas between adjacent components is prevented.

[0062] Similarly, a seal can also be provided between the first cover plate 2 and adjacent humidifying units 1, and a seal can also be provided between the second cover plate 3 and adjacent humidifying units 1.

[0063] Among them, the seal can be a colloid plugging the edges of adjacent components, or a sealing ring located between adjacent components.

[0064] Among them, the number of sealing rings between adjacent components can be multiple, and each sealing ring surrounds one or two channels respectively; it can also be one, and this sealing ring surrounds all channels at the same time.

[0065] Specifically, as Figure 4 shown, for the case where the number of sealing rings between adjacent components is multiple, the sealing rings can include a dry gas inlet sealing ring 41, a dry gas outlet sealing ring 42, and a humid gas sealing ring 43. Among them, the dry gas inlet sealing ring 41 surrounds the dry gas inlet passage 111; the dry gas outlet sealing ring 42 surrounds the dry gas outlet passage 112; the humid gas sealing ring 43 surrounds both the humid gas inlet passage 113 and the humid gas outlet passage 114 at the same time.

[0066] Among them, the independent arrangement of the dry gas inlet sealing ring 41, the dry gas outlet sealing ring 42, and the humid gas sealing ring 43 enables the dry gas channel and the humid gas channel to have two - stage isolation between any adjacent components, that is, when any sealing ring has a sealing leak, the leaked gas will be blocked by other sealing rings, avoiding gas mixing. Thus, through the independent arrangement of multiple sealing rings, it is ensured that dry gas and humid gas will not be mixed between adjacent components, improving the stability of the fuel cell during use.

[0067] In addition, on this basis, the dry gas inlet sealing ring 41 and the dry gas outlet sealing ring 42 are located on both sides of the humid gas sealing ring 43. When a certain sealing ring between two components is damaged and leaks, the generated gas will be discharged from the corresponding edges of the gap between the two components, and depending on the type of the damaged sealing ring, the discharged gas is humid gas or dry gas. Thus, when moisture leakage is detected at the edge of a certain gap, it can be directly determined that the humid gas sealing ring 43 in this gap is damaged; when dry gas leakage is detected at a certain side edge of a certain gap, it can be directly determined that the sealing ring on the corresponding side of the humid gas sealing ring 43 in this gap is probably damaged (Figure 4 For example, when the leakage of dry gas is detected at the uppermost edge of a certain gap, it can be directly determined that the dry gas inlet seal ring 41 located above the wet gas seal ring 43 in the gap is damaged).

[0068] Therefore, when a gas leakage occurs in the equipment and maintenance is carried out, the damaged seal ring can be determined relatively quickly, improving the maintenance efficiency.

[0069] Furthermore, as Figures 1 - 2 shown, placement grooves for placing each seal ring can be provided on the surface of the unit housing 11, which is convenient for arranging the seal rings between adjacent components subsequently. The seal rings are positioned through the placement grooves to prevent the seal rings from shifting and affecting the sealing effect.

[0070] As Figures 1 - 2 shown, based on the above types of seal rings, the seal ring placement grooves include a dry gas inlet seal ring placement groove 115, a dry gas outlet seal ring placement groove 116, and a wet gas seal ring placement groove 117.

[0071] Among them, the placement grooves can be provided only on one side of the unit housing 11, or independent placement grooves can be provided on the opposite sides of the unit housing 11 respectively.

[0072] When the placement grooves are provided only on one side of the unit housing 11, corresponding placement grooves can be provided on the inner side of the first cover plate 2 or the second cover plate 3 on the other side of the unit housing 11.

[0073] Alternatively, on the basis of the above-mentioned various seal rings, the seal also includes an external leakage seal ring (not shown in the figure), and the external leakage seal ring surrounds the dry gas inlet seal ring 41, the dry gas outlet seal ring 42, and the wet gas seal ring 43 at the same time.

[0074] Through the setting of the external leakage seal ring, there are two - stage isolations between the dry gas channel or the wet gas channel and the outside world between any adjacent components. That is, when any seal ring inside the external leakage seal ring has a sealing leakage, the leaked gas will be blocked by the external leakage seal ring and will not directly cause the dry gas or wet gas to leak to the outside of the membrane humidifier, improving the stability of the vehicle during the use of the fuel cell.

[0075] Among them, the cross - sectional shapes of the above - mentioned various seal rings can be square or circular respectively.

[0076] In a feasible implementation manner, the dry gas inlet channel 111, the wet gas outlet channel 114, the wet gas inlet channel 113, and the dry gas outlet channel 112 are parallel to each other and arranged side by side in sequence. For example, as Figures 1 - 3As shown, the dry gas inlet channel 111, the wet gas outlet channel 114, the wet gas inlet channel 113, and the dry gas outlet channel 112 are arranged side by side in sequence from top to bottom.

[0077] Inside the unit housing 11, there is an internal through cavity which is sequentially connected to the dry gas inlet channel 111, the wet gas outlet channel 114, the wet gas inlet channel 113, and the dry gas outlet channel 112.

[0078] Thus, when the dry gas passes through the hollow fiber membrane tube and the wet gas passes through the membrane bundle frame 121, the gas flow directions of the dry gas and the wet gas in the membrane module 12 are opposite, and the dry gas and the wet gas form a countercurrent exchange, improving the exchange efficiency of moisture.

[0079] It can be understood that the dry gas inlet channel 111, the wet gas outlet channel 114, the wet gas inlet channel 113, and the dry gas outlet channel 112 can also be arranged side by side in sequence from bottom to top or from left to right or from right to left, and no specific limitation is made here.

[0080] Among them, the internal through cavity can be perpendicular to the dry gas inlet channel 111, the wet gas outlet channel 114, the wet gas inlet channel 113, and the dry gas outlet channel 112.

[0081] Among them, the dry gas inlet channel 111 and the dry gas outlet channel 112 can be symmetric with respect to the midline of the waist of the unit housing 11, and the wet gas inlet channel 113 and the wet gas outlet channel 114 can be symmetric with respect to the midline of the waist of the unit housing 11.

[0082] The membrane bundle frame 121 is installed in the internal through cavity, and both ends of the membrane bundle frame 121 respectively extend near the inner walls of the dry gas inlet channel 111 and the dry gas outlet channel 112. Preferably, both ends of the membrane bundle frame 121 are flush with the inner walls of the dry gas inlet channel 111 and the dry gas outlet channel 112 respectively.

[0083] As Figures 1 - 2 shown, the frame body of the membrane bundle frame 121 is provided with wet gas inlet and outlet windows 122 at positions corresponding to the wet gas outlet channel 114 and the wet gas inlet channel 113, for enabling the wet gas to enter the membrane bundle frame 121 and contact the hollow fiber membrane tube to complete the exchange of moisture.

[0084] The cross-sectional shape of the wet gas inlet and outlet windows 122 can be one or several of circular, square, and triangular shapes, the window size can be between 3 - 20 mm, and the total number of windows can be between 50 - 200.

[0085] The number of internal through cavities in each unit housing 11 can be one or more, and one set of membrane module 12 is installed in each internal cylinder cavity. Among them Figure 1 、 Figure 2 、 Figure 4 shown is that the number of internal through cavities in the unit housing 11 is one.

[0086] Furthermore, as Figure 3 shown, the end of the membrane bundle frame 121 is potted with potting glue 13, the membrane bundle frame 121 and the hollow fiber membrane tube are assembled into an integral structure, and the gap between the inner through cavity and the end of the membrane bundle frame 121 is blocked by the potting glue 13, so as to fix and constrain the membrane bundle frame 121 and the hollow fiber membrane tube, and form a separation structure between the dry gas channel and the wet gas channel, reducing the probability of confusion between the dry gas and the wet gas, and improving the stability of the fuel cell during use;

[0087] A sealant 14 is arranged outside the potting glue 13 to strengthen the separation between the dry gas channel and the wet gas channel through the sealant 14. The sealant 14 is covered with a sealant cover plate 15. The sealant cover plate 15 is connected to the unit housing 11. The sealant cover plate 15 is used to compact the sealant 14, thereby preventing the sealant 14 from falling off or leaking air.

[0088] The connection manner between the sealant cover plate 15 and the unit housing 11 can be various connection manners such as snap connection or bolt connection, etc., which will not be elaborated here too much.

[0089] It should be understood that although the preferred embodiments of the present application have been described in the specification of the present application, those skilled in the art can make additional changes and modifications once they know the basic creative concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments and all changes and modifications falling within the scope of the embodiments of the present application.

[0090] Finally, it should also be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or terminal device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of another identical element in the process, method, article or terminal device including the said element.

[0091] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

Claims

1. A fuel cell membrane humidifier, characterized in that, It includes a humidifying main body, and the humidifying main body includes a plurality of humidifying units (1), and any two adjacent humidifying units (1) are detachably connected, so as to adjust the number of humidifying units in the humidifying main body; The humidifying unit (1) includes a unit housing (11) and a membrane assembly (12), and the unit housing (11) includes a dry gas inlet channel (111), a dry gas outlet channel (112), a humid gas inlet channel (113) and a humid gas outlet channel (114); The membrane assembly (12) includes a hollow fiber membrane tube and a membrane bundle frame (121) that cooperate with each other. The membrane bundle frame (121) communicates with the humid gas inlet channel (113) and the humid gas outlet channel (114), and both ends of the hollow fiber membrane tube communicate with the dry gas inlet channel (111) and the dry gas outlet channel (112); The dry gas inlet channels (111), dry gas outlet channels (112), humid gas inlet channels (113) and humid gas outlet channels (114) of the plurality of humidifying units (1) in the humidifying main body correspond to each other and are connected; The membrane humidifier further includes a first cover plate (2) arranged on one side of the humidifying main body, and the cover plate closes the openings of the respective channels of the humidifying main body exposed on the corresponding side.

2. The fuel cell membrane humidifier according to claim 1, wherein The membrane humidifier further includes a second cover plate (3) arranged on the other side of the humidifying main body. A dry gas inlet (31), a dry gas outlet (32), a humid gas inlet (33) and a humid gas outlet (34) are arranged on the second cover plate (3). The dry gas inlet (31) communicates with the dry gas inlet channel (111), the dry gas outlet (32) communicates with the dry gas outlet channel (112), the humid gas inlet (33) communicates with the humid gas inlet channel (113), and the humid gas outlet (34) communicates with the humid gas outlet channel (114).

3. The fuel cell membrane humidifier according to claim 2, wherein The humidifying unit (1), the first cover plate (2) and the second cover plate (3) are all provided with a plurality of positioning holes; The positioning holes of the first cover plate (2), the second cover plate (3) and the plurality of humidifying units (1) correspond to each other and are connected. Each group of corresponding positioning holes is penetrated by a positioning rod (5), and the diameter of the positioning rod (5) is adapted to the positioning hole; Nuts are threadedly connected to both ends of the positioning rod (5), and the nuts squeeze the first cover plate (2) and the second cover plate (3).

4. The fuel cell membrane humidifier according to claim 2, wherein A sealing member is provided between the first cover plate (2) and the adjacent humidifying unit (1); A sealing member is provided between the second cover plate (3) and the adjacent humidifying unit (1).

5. A fuel cell membrane humidifier according to claim 1, characterized in that, A sealing member is provided between adjacent humidifying units (1).

6. A fuel cell membrane humidifier according to any one of claims 4-5, characterized in that, The sealing member includes a dry gas inlet sealing ring (41), a dry gas outlet sealing ring (42) and a humid gas sealing ring (43); The dry gas inlet sealing ring (41) surrounds the dry gas inlet channel (111); the dry gas outlet sealing ring (42) surrounds the dry gas outlet channel (112); the humid gas sealing ring (43) surrounds both the humid gas inlet channel (113) and the humid gas outlet channel (114) at the same time.

7. The fuel cell membrane humidifier according to claim 6, characterized in that, The seal also includes an external leakage seal ring, which simultaneously surrounds the dry gas inlet seal ring (41), the dry gas outlet seal ring (42), and the wet gas seal ring (43).

8. The fuel cell membrane humidifier according to claim 6, wherein The surface of the unit housing (11) is provided with placement grooves for placing each seal ring.

9. A fuel cell membrane humidifier according to claim 1, wherein, The unit housing (11) has an internal through cavity, which sequentially communicates with the dry gas inlet passage (111), the wet gas outlet passage (114), the wet gas inlet passage (113), and the dry gas outlet passage (112). The membrane bundle frame (121) is installed in the internal through cavity, and the frame of the membrane bundle frame (121) is provided with wet gas inlet and outlet windows (122) at positions corresponding to the wet gas outlet passage (114) and the wet gas inlet passage (113).

10. A fuel cell membrane humidifier according to claim 1, wherein, The end of the membrane bundle frame (121) is potted with potting glue (13), a sealant (14) is arranged outside the potting glue (13), the sealant (14) is covered with a sealant cover plate (15), and the sealant cover plate (15) is connected to the unit housing (11).

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