Fuel cell membrane humidifier

Abstract

The embodiment of the invention relates to a fuel cell membrane humidifier, and relates to the technical field of fuel cells, the fuel cell membrane humidifier comprises a humidifying main body and a first cover plate, the humidifying main body comprises a plurality of detachably connected humidifying units; the humidifying unit is provided with a dry gas inlet channel, a dry gas outlet channel, a wet gas inlet channel and a wet gas outlet channel; the membrane component comprises a hollow fiber membrane tube communicated with the moisture inlet channel and the moisture outlet channel and a membrane bundle frame communicated with the moisture inlet channel and the moisture outlet channel; the dry gas inlet channels, the dry gas outlet channels, the wet gas inlet channels and the wet gas outlet channels of the multiple humidifying units are in one-to-one correspondence and communicate with one another. The first cover plate seals the openings, exposed to the corresponding sides, of the channels of the humidifying body. The quantity of the humidifying units in the humidifying main body can be adjusted, the humidity requirements of fuel cell systems in different power sections can be met, and the compatibility is higher; and the humidifying unit can be independently replaced, so that the service life of the product is prolonged, the waste of materials is also avoided, and the cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of fuel cell technology, and in particular to a fuel cell membrane humidifier. Background Art

[0002] In the context of global energy shortage and "dual carbon" policy, hydrogen fuel cells are considered to be one of the most promising solutions to 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 start-up speed, zero emission, no corrosion, high specific power, high electrical efficiency, low noise, and low-temperature cold start, and have received widespread attention and application.

[0003] As the core component of the air supply system in the fuel cell auxiliary system, the membrane humidifier delivers air with stable flow and humidity to the fuel cell engine. 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 high-performance hollow fiber membranes. The membrane humidifier humidifies dry air to the humidity required by the fuel cell stack, further improving the efficiency and life of the fuel cell system. At present, the mainstream membrane humidifier on the market is composed of a plastic shell with several membrane components, and the shell and membrane components are encapsulated as one by potting glue. Each membrane component includes several hollow fiber membranes.

[0005] In the process of realizing this application, the inventors found that there are at least the following problems in the prior art: the structure of the current membrane humidifier products is relatively fixed, which makes it difficult to meet the needs of fuel cell systems in different power ranges and has poor compatibility. In addition, membrane humidifiers have 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 does not meet the requirements of the fuel cell system, the entire membrane humidifier can only be scrapped, causing great waste. Summary of the invention

[0006] The embodiment of the present application provides a fuel cell membrane humidifier, which aims to solve the technical problem that the existing membrane humidifier is difficult to meet the needs of fuel cell systems in different power ranges and has poor compatibility.

[0007] The embodiment of the present application provides a fuel cell membrane humidifier, including a humidification body, the humidification body including a plurality of humidification units, any two adjacent humidification units being detachably connected; The humidification unit comprises a unit housing and a membrane assembly, wherein the unit housing comprises a dry gas inlet channel, a dry gas outlet channel, a wet gas inlet channel and a wet gas outlet channel; The membrane assembly comprises a hollow fiber membrane tube and a membrane bundle frame which cooperate with each other, the membrane bundle frame is connected to the wet gas inlet channel and the wet gas outlet channel, and the two ends of the hollow fiber membrane tube are connected to the dry gas inlet channel and the dry gas outlet channel; The dry gas inlet channels, dry gas outlet channels, wet gas inlet channels and wet gas outlet channels of the plurality of humidifying units in the humidifying body correspond to each other and are connected; The membrane humidifier further includes a first cover plate disposed on one side of the humidifying body, and the cover plate closes openings of the humidifying body through which each channel is exposed to a corresponding side.

[0008] Optionally, the membrane humidifier also includes a second cover plate arranged on the other side of the humidification body, and the second cover plate is provided with a dry gas inlet, a dry gas outlet, a wet gas inlet and a wet gas outlet, the dry gas inlet is connected to the dry gas inlet channel, the dry gas outlet is connected to the dry gas outlet channel, the wet gas inlet is connected to the wet gas inlet channel, and the wet gas outlet is connected to the wet gas outlet channel.

[0009] Optionally, the humidifying unit, the first cover plate and the second cover plate are each provided with a plurality of positioning holes; The first cover plate, the second cover plate and the positioning holes of the plurality of humidifying units correspond to each other and are connected, and each group of corresponding positioning holes is interspersed with a positioning rod, and the positioning rod is adapted to the diameter of the positioning hole; Both ends of the positioning rod are threadedly connected with nuts, and the nuts press the first cover plate and the second cover plate.

[0010] Optionally, a sealing member is provided between the first cover plate and the adjacent humidifying unit; A sealing member is provided between the second cover plate and the adjacent humidifying unit.

[0011] Optionally, a seal is provided between adjacent humidification units.

[0012] Optionally, the sealing element comprises a dry gas inlet sealing ring, a dry gas outlet sealing ring and a wet gas sealing ring; The dry gas inlet sealing ring surrounds the outside of the dry gas inlet channel; the dry gas outlet sealing ring surrounds the outside of the dry gas outlet channel; and the wet gas sealing ring surrounds the wet gas inlet channel and the wet gas outlet channel at the same time.

[0013] Optionally, the sealing component further includes an external leakage sealing ring, which surrounds the dry gas inlet sealing ring, the dry gas outlet sealing ring and the wet gas sealing ring at the same time.

[0014] Optionally, a surface of the unit housing is provided with a placement groove for placing each sealing ring.

[0015] Optionally, the unit shell has an inner through cavity, and the inner through cavity sequentially connects the dry gas inlet channel, the wet gas outlet channel, the wet gas inlet channel and the dry gas outlet channel; The membrane bundle frame is installed in the inner through cavity, and the frame body of the membrane bundle frame is provided with moisture inlet and outlet windows at positions corresponding to the moisture outlet channel and the moisture inlet channel.

[0016] Optionally, the end of the membrane bundle frame is potted with potting glue, a sealant is arranged outside the potting glue, the sealant is covered with a sealant cover plate, and the sealant cover plate is connected to the unit shell.

[0017] In an embodiment of the present application, a fuel cell membrane humidifier is provided, which is provided with a humidifying body, and the humidifying body includes a plurality of humidifying units. Any two adjacent humidifying units can be detachably connected, so that the humidifying units in the humidifying body can be disassembled and assembled, and the number of humidifying units in the humidifying body can be adjusted. When using the membrane humidifier, the number of humidifying units in the membrane humidifier is adjusted according to the humidity demand of the power segment of the fuel cell system, and the humidification capacity of the membrane humidifier can be adjusted by increasing or decreasing the number of humidifying units. By setting the number of different humidifying units, the humidity requirements of fuel cell systems in different power segments can be met, and the compatibility is higher; and if individual humidifying units are damaged (such as membrane tube performance attenuation, internal leakage, external leakage, etc.), the humidifying units can be replaced separately, which prolongs the service life of the product, avoids material waste, and further reduces costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] Figure 1 is a three-dimensional schematic diagram of a humidification unit proposed in one embodiment of the present application; Figure 2 is a forward schematic diagram of a humidification unit proposed in one embodiment of the present application; Figure 3 is a three-dimensional schematic diagram of a fuel cell membrane humidifier proposed in one embodiment of the present application; Figure 4 It is a schematic diagram of an explosion of a fuel cell membrane humidifier proposed in one embodiment of the present application.

[0020] Description of reference numerals: 1-humidification unit, 11-unit shell, 111-dry gas inlet channel, 112-dry gas outlet channel, 113-wet gas inlet channel, 114-wet gas outlet channel, 115-dry gas inlet sealing ring placement groove, 116-dry gas outlet sealing ring placement groove, 117-wet gas sealing ring placement groove, 12-membrane assembly, 121-membrane bundle frame, 122-wet gas inlet and outlet windows, 13-potting glue, 14-sealant, 15-sealant cover, 2-first cover, 3-second cover, 31-dry gas inlet, 32-dry gas outlet, 33-wet gas inlet, 34-wet gas outlet, 41-dry gas inlet sealing ring, 42-dry gas outlet sealing ring, 43-wet gas sealing ring, 5-positioning rod. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0022] The features of the terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, the meaning of "plurality" is two or more.

[0023] In the description of the present application, it should be understood that the terms "length", "upper", "lower", "inner", "outer", "circumferential", etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings, and are 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 understood as a limitation on the present application.

[0024] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0025] In the related technology, the membrane humidifier transfers moisture and heat through a high-performance hollow fiber membrane. Specifically, the gas with higher humidity (i.e., wet air) is made to flow through the outside of the high-performance hollow fiber membrane tube, and the gas with lower humidity (i.e., dry gas) is made to flow through the inside of the high-performance hollow fiber membrane tube. The moisture in the external moist air is transferred to the internal dry gas through the high-performance hollow fiber membrane tube, thereby humidifying the dry air to reach the humidity required by the fuel cell stack, further improving the efficiency and life of the fuel cell system.

[0026] At present, the mainstream membrane humidifiers on the market are composed of a specific plastic shell with several membrane components, and the shell and membrane components are encapsulated as a whole by potting glue. Each membrane component includes several hollow fiber membranes. Due to its fixed structure, it cannot meet the needs of fuel cell systems in different power ranges at the same time, and its compatibility is poor. At present, the main problems of membrane humidifier products include performance degradation of membrane tubes after long-term operation, internal leakage, external leakage, high cost, low compatibility, etc. Once the product performance does not meet the requirements of the fuel cell system, the product can only be scrapped, causing great waste.

[0027] In response to these problems, the present application provides a new type of fuel cell membrane humidifier with adjustable performance. By setting different numbers of standard units, the humidity requirements of fuel cell systems in different power ranges can be met. In addition, if there are problems such as performance attenuation and internal leakage of the membrane tubes of individual humidification units, they can be replaced individually, thereby extending the service life of the product, avoiding material waste, and further reducing costs.

[0028] Combine the following Figure 1-Figure 4 A fuel cell membrane humidifier proposed in an embodiment of the present application is described.

[0029] like Figure 1-Figure 2 As shown, the fuel cell membrane humidifier includes a humidification body, which includes a plurality of humidification units 1. Any two adjacent humidification units 1 can be detachably connected, so that the humidification units 1 in the humidification body can be disassembled and assembled, thereby adjusting the number of humidification units 1 in the humidification body.

[0030] The humidification unit 1 includes a unit shell 11 and a membrane assembly 12, the unit shell 11 includes a dry gas inlet channel 111, a dry gas outlet channel 112, a wet gas inlet channel 113 and a wet gas outlet channel 114, wherein the openings at both ends of the dry gas inlet channel 111, the dry gas outlet channel 112, the wet gas inlet channel 113 and the wet gas outlet channel 114 are respectively exposed on both sides of the unit shell 11.

[0031] 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 connects the wet gas inlet channel 113 and the wet gas outlet channel 114. The two ends of the hollow fiber membrane tube connect the dry gas inlet channel 111 and the dry gas outlet channel 112. In a single humidification unit 1, the dry gas input from the dry gas inlet channel 111 can be output from the dry gas outlet channel 112 after passing through the hollow fiber membrane tube, and the wet gas input from the wet gas inlet channel 113 can be output from the wet gas outlet channel 114 after passing through the membrane bundle frame 121, thereby achieving humidification of the dry gas.

[0032] like Figure 4 As shown, in the humidification body, the dry gas inlet channel 111, the dry gas outlet channel 112, the wet gas inlet channel 113 and the wet gas outlet channel 114 of the multiple humidification units 1 correspond to each other and are connected; the membrane humidifier also includes a first cover plate 2 arranged on one side of the humidification body, and the cover plate closes the openings that expose each channel of the humidification body to the corresponding side.

[0033] Based on this, when using the membrane humidifier, the humidification body is adjusted according to the humidity demand of the power section of the fuel cell system, that is, the humidification units 1 in the humidification body are disassembled and assembled, and the number of humidification units 1 in the membrane humidifier is adjusted.

[0034] Specifically, according to the humidity requirement of the power section of the fuel cell system, a suitable number of humidification units 1 are selected, and a corresponding number of humidification units 1 are assembled together to form the required humidification body, so that the corresponding channels of all humidification units 1 are connected in sequence to form multiple channels running through the entire humidification body.

[0035] On the basis of forming the above-mentioned multiple channels, a first cover plate 2 is arranged on one side of the humidification body, and the openings on the corresponding sides of the dry gas inlet channel 111, the dry gas outlet channel 112, the wet gas inlet channel 113 and the wet 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, and the dry gas enters the dry gas outlet channel 112 after passing through the hollow fiber membrane tubes of all the humidification units 1, and is output from the front end of the dry gas outlet channel 112; wet gas is input from the front end of the wet gas inlet channel 113, the wet gas enters the entire wet gas inlet channel 113, the wet gas enters the wet gas outlet channel 114 after passing through the membrane bundle frames 121 of all the humidification units 1, and is output from the front end of the wet gas outlet channel 114, thereby completing the humidification of the dry gas under the action of the membrane components 12 of all the humidification units 1.

[0036] It can be seen that each humidification unit 1 in the humidification body is a functional component of the membrane humidifier for humidification. The humidification capacity of the membrane humidifier can be adjusted by increasing or decreasing the number of humidification units 1. By setting the number of different humidification units 1, the humidity requirements of fuel cell systems in different power ranges can be met, and the compatibility is higher; and if individual humidification units 1 are damaged (such as membrane tube performance attenuation, internal leakage, external leakage, etc.), the humidification unit 1 can be replaced separately, which prolongs the service life of the product, avoids material waste, and further reduces costs.

[0037] Among them, the membrane bundle frame 121 is a hollow columnar structure, which is filled with a plurality of hollow fiber membrane tubes (not shown in the figure). The hollow fiber membrane tubes pass through the membrane bundle frame 121 in a direction parallel to the length direction of the membrane bundle frame 121 and are constrained by the membrane bundle frame 121. The matching method between the membrane bundle frame 121 and the hollow fiber membrane tube is the existing technology, and its structure and principle will not be repeated here.

[0038] The unit housing 11 may be in the shape of a cube, a cuboid or a cylinder.

[0039] like Figure 3-Figure 4 As shown, in a feasible embodiment, the humidifier also includes a second cover plate 3 arranged on the other side of the humidifying body, and the second cover plate 3 is provided with a dry gas inlet 31, a dry gas outlet 32, a wet gas inlet 33 and a wet gas outlet 34, the dry gas inlet 31 is connected to the dry gas inlet channel 111 of the humidifying body, the dry gas outlet 32 ​​is connected to the dry gas outlet channel 112 of the humidifying body, the wet gas inlet 33 is connected to the wet gas inlet channel 113 of the humidifying body, and the wet gas outlet 34 is connected to the wet gas outlet channel 114 of the humidifying body.

[0040] The dry gas inlet 31, the dry gas outlet 32, the wet gas inlet 33 and the wet gas outlet 34 are used to connect with the gas pipeline to complete the input and discharge of dry and wet gases.

[0041] The dry gas inlet 31, the dry gas outlet 32, the wet gas inlet 33 and the wet gas outlet 34 may be circular in shape, with a size between 50-100 mm.

[0042] For the detachable connection between two adjacent humidification units 1, the detachable connection can be a direct detachable connection between the adjacent humidification units 1, such as installing the required number of humidification units 1 in sequence by snapping or riveting; or it can be an indirect detachable connection between the adjacent humidification units 1, such as stacking the required number of humidification units 1 together, and squeezing the two sides of the stacked humidification units 1 by other components so that all the humidification units 1 are tightly abutted together.

[0043] In a feasible implementation, both sides of the stacked humidifying units 1 may be squeezed by the first cover plate 2 and the second cover plate 3 so that all the humidifying units 1 are tightly abutted against each other.

[0044] Furthermore, the humidifying unit 1, the first cover plate 2, and the second cover plate 3 may be connected by bolts.

[0045] Furthermore, if Figure 3-Figure 4 As shown, the humidifying unit 1, the first cover plate 2 and the second cover plate 3 can be provided with a plurality of positioning holes; wherein 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, and each group of corresponding positioning holes is interspersed with a positioning rod 5, and the positioning rod 5 is adapted to the diameter of the positioning hole, so that the four channels of all the humidifying units 1 can be aligned and connected, thereby ensuring the structural stability of the membrane humidifier and reducing air leakage due to misalignment between channels.

[0046] Both ends of the positioning rod 5 are threaded, and both ends of the positioning rod 5 are respectively threadedly connected with nuts. The nuts located at both ends of the positioning rod 5 are tightened and squeeze the first cover plate 2 and the second cover plate 3 respectively, so that the first cover plate 2, the second cover plate 3 and all the humidification units 1 are tightly abutted, thereby achieving a detachable connection between any two adjacent humidification units 1 through the cooperation of the first cover plate 2, the second cover plate 3, the positioning rod 5 and the nuts.

[0047] Furthermore, if Figure 3-Figure 4 As shown, positioning holes can be opened on the end surface 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 on each edge, and preferably a plurality of positioning holes are opened. All 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 distributed circumferentially on the periphery of the sealing 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 them, the first cover plate 2, the second cover plate 3 and the humidifying unit 1 are brought into close contact, thereby improving the sealing effect of the sealing ring.

[0048] In a feasible embodiment, a seal is provided between adjacent humidification units 1, and the seal surrounds the dry gas inlet channel 111, the dry gas outlet channel 112, the wet gas inlet channel 113, and the wet gas outlet channel 114 between adjacent humidification units 1. The provision of the seal prevents dry gas or wet gas from leaking between adjacent components.

[0049] Similarly, a sealing member may be provided between the first cover plate 2 and the adjacent humidifying unit 1 , and a sealing member may be provided between the second cover plate 3 and the adjacent humidifying unit 1 .

[0050] The sealing member may be a colloid sealing the edges of adjacent components, or a sealing ring located between adjacent components.

[0051] There may be multiple sealing rings between adjacent components, each of which surrounds one or two channels respectively; or there may be only one sealing ring, which surrounds all channels at the same time.

[0052] Specifically, if Figure 4 As shown, in the case where there are multiple sealing rings between adjacent components, the sealing rings may include a dry gas inlet sealing ring 41, a dry gas outlet sealing ring 42 and a wet gas sealing ring 43, wherein 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; and the wet gas sealing ring 43 surrounds both the wet gas inlet channel 113 and the wet gas outlet channel 114.

[0053] Among them, the independent setting of the dry gas inlet sealing ring 41, the dry gas outlet sealing ring 42 and the wet gas sealing ring 43 enables the dry gas channel and the wet gas channel to have two-level isolation between any adjacent components, that is, when a sealing leak occurs in any sealing ring, the leaked gas will be blocked by other sealing rings to avoid gas confusion. Therefore, the independent setting of multiple sealing rings ensures that there will be no confusion between dry gas and wet gas between adjacent components, thereby improving the stability of the fuel cell during use.

[0054] 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 moisture sealing ring 43. When a sealing ring between the two components is damaged and leaks, the generated gas will be discharged from the corresponding edge of the gap between the two components, and the discharged gas is moisture or dry gas according to the type of damaged sealing ring. Therefore, when moisture leakage is detected at the edge of a gap, it can be directly determined that the moisture sealing ring 43 in the gap is damaged; when dry gas leakage is detected at the edge of one side of a gap, it can be directly determined that the sealing ring on the corresponding side of the moisture sealing ring 43 in the gap is likely to be damaged (with a high probability of damage). Figure 4 For example, when dry gas leakage is detected at the uppermost edge of a gap, it can be directly determined that the dry gas inlet sealing ring 41 on the upper side of the wet gas sealing ring 43 in the gap is damaged).

[0055] Therefore, when gas leakage is detected in the equipment and maintenance is carried out, the damaged sealing ring can be identified relatively quickly, thereby improving the efficiency of maintenance.

[0056] Furthermore, if Figure 1-Figure 2 As shown, a placement groove for placing each sealing ring can be set on the surface of the unit shell 11 to facilitate the subsequent arrangement of the sealing ring between adjacent components. The sealing ring is positioned through the placement groove to prevent the sealing ring from shifting and affecting the sealing effect.

[0057] like Figure 1-Figure 2 As shown, based on the above-mentioned type of sealing ring, the sealing ring placement groove includes a dry gas inlet sealing ring placement groove 115, a dry gas outlet sealing ring placement groove 116 and a wet gas sealing ring placement groove 117.

[0058] The placement groove may be provided on only one side of the unit housing 11 , or independent placement grooves may be provided on two opposite sides of the unit housing 11 .

[0059] When the placement groove is provided on only one side of the unit housing 11 , a corresponding placement groove may 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 .

[0060] Alternatively, in addition to the above-mentioned sealing rings, the sealing member further comprises an external leakage sealing ring (not shown in the figure), which surrounds the dry gas inlet sealing ring 41, the dry gas outlet sealing ring 42 and the wet gas sealing ring 43 at the same time.

[0061] By setting the external leakage sealing ring, there is a two-level isolation between the dry gas channel or the wet gas channel and the outside world between any adjacent components, that is, when a sealing leakage occurs in any sealing ring within the external leakage sealing ring, the leaked gas will be blocked by the external leakage sealing ring and will not directly cause the dry gas or wet gas to leak out of the membrane humidifier, thereby improving the stability of the vehicle during the use of the fuel cell.

[0062] Wherein, the cross-sectional shape of each of the above-mentioned sealing rings can be square or circular respectively.

[0063] 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. Figure 1-Figure 3 As 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.

[0064] The unit shell 11 has an inner through cavity, which sequentially connects 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 .

[0065] Therefore, when the dry gas passes through the hollow fiber membrane tube and the wet gas passes through the membrane bundle frame 121, the dry gas and the wet gas flow in opposite directions in the membrane assembly 12, and the dry gas and the wet gas form a countercurrent exchange, thereby improving the water exchange efficiency.

[0066] It is understandable 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 may also be arranged in sequence from bottom to top or from left to right or from right to left, and no specific limitation is made here.

[0067] The inner through cavity may 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 .

[0068] The dry gas inlet channel 111 and the dry gas outlet channel 112 may be symmetrical relative to the waist midline of the unit shell 11 , and the wet gas inlet channel 113 and the wet gas outlet channel 114 may be symmetrical relative to the waist midline of the unit shell 11 .

[0069] The membrane bundle frame 121 is installed in the inner cavity, and the two ends of the membrane bundle frame 121 extend to the vicinity of the inner walls of the dry gas inlet channel 111 and the dry gas outlet channel 112 respectively. It is preferred that the two 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.

[0070] like Figure 1-Figure 2 As shown, the frame of the membrane bundle frame 121 is provided with moisture inlet and outlet windows 122 at positions corresponding to the moisture outlet channel 114 and the moisture inlet channel 113, so as to allow moisture to enter the membrane bundle frame 121 and contact the hollow fiber membrane tube to complete the water exchange.

[0071] The cross-sectional shape of the moisture inlet and outlet window 122 can be one or more of circular, square, and triangular. The window size can be between 3 and 20 mm, and the total number of windows can be between 50 and 200.

[0072] The number of the inner through cavities in each unit housing 11 can be one or more, and a set of membrane components 12 is installed in each inner cylinder cavity. Figure 1 , Figure 2 , Figure 4 It is shown that the number of the inner through cavity in the unit housing 11 is one.

[0073] Further, such as Figure 3 As shown, the end of the membrane bundle frame 121 is potted with a potting glue 13, the membrane bundle frame 121 and the hollow fiber membrane tube are assembled into an integrated structure, and the gap between the inner cavity and the end of the membrane bundle frame 121 is blocked by the potting glue 13, the membrane bundle frame 121 and the hollow fiber membrane tube are fixed and constrained, and a separation structure between the dry gas channel and the wet gas channel is formed, which reduces the probability of confusion between dry gas and wet gas, and improves the stability of the fuel cell during use; A sealant 14 is arranged outside the potting glue 13 to strengthen the separation between the dry gas channel and the wet gas channel. The sealant 14 is covered with a sealant cover plate 15, which is connected to the unit shell 11 and is used to compact the sealant 14 to prevent the sealant 14 from falling off or leaking.

[0074] The connection between the sealant cover plate 15 and the unit housing 11 may be a clamping connection, a bolt connection or other connection methods, which will not be described in detail here.

[0075] It should be understood that although the present specification has described the preferred embodiments of the present invention, those skilled in the art may make additional changes and modifications to these embodiments once they know the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present invention.

[0076] Finally, it should be noted that, in this article, relational terms such as first and second, etc. 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 terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0077] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

Claims

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

2. A fuel cell membrane humidifier according to claim 1, characterized in that: The membrane humidifier further comprises a second cover plate (3) arranged on the other side of the humidifying body, the second cover plate (3) being provided with a dry gas inlet (31), a dry gas outlet (32), a wet gas inlet (33) and a wet gas outlet (34), the dry gas inlet (31) being in communication with the dry gas inlet channel (111), the dry gas outlet (32) being in communication with the dry gas outlet channel (112), the wet gas inlet (33) being in communication with the wet gas inlet channel (113), and the wet gas outlet (34) being in communication with the wet gas outlet channel (114).

3. A fuel cell membrane humidifier according to claim 2, characterized in that: 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, and each group of corresponding positioning holes is penetrated by a positioning rod (5), and the positioning rod (5) is adapted to the diameter of the positioning hole; Nuts are threadedly connected at both ends of the positioning rod (5), and the nuts press the first cover plate (2) and the second cover plate (3).

4. A fuel cell membrane humidifier according to claim 2, characterized in that: 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 element 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 element comprises a dry gas inlet sealing ring (41), a dry gas outlet sealing ring (42) and a wet gas sealing ring (43); The dry gas inlet sealing ring (41) surrounds the outside of the dry gas inlet channel (111); the dry gas outlet sealing ring (42) surrounds the outside of the dry gas outlet channel (112); and the wet gas sealing ring (43) surrounds both the wet gas inlet channel (113) and the wet gas outlet channel (114).

7. A fuel cell membrane humidifier according to claim 6, characterized in that: The sealing component further comprises an external leakage sealing ring, which simultaneously surrounds the dry gas inlet sealing ring (41), the dry gas outlet sealing ring (42) and the wet gas sealing ring (43).

8. A fuel cell membrane humidifier according to claim 6, characterized in that: The surface of the unit housing (11) is provided with placement grooves for placing each sealing ring.

9. A fuel cell membrane humidifier according to claim 1, characterized in that: The unit shell (11) has an inner through cavity, the inner through cavity sequentially connecting 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); The membrane bundle frame (121) is installed in the inner through cavity, and the frame body of the membrane bundle frame (121) is provided with moisture inlet and outlet windows (122) at positions corresponding to the moisture outlet channel (114) and the moisture inlet channel (113).

10. A fuel cell membrane humidifier according to claim 1, characterized in that: 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 shell (11).

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