A water heat exchange device for fuel cell

Abstract

The present application discloses a water heat exchange membrane assembly for a water heat exchange device of a fuel cell, characterized in that the water heat exchange membrane assembly includes at least one water heat exchange membrane assembly unit, and the water heat exchange membrane assembly unit includes a five-in-one diaphragm structure and a supporting frame that are stacked and compositely formed; the five-in-one diaphragm structure includes, from top to bottom, a first hot melt adhesive layer, a first supporting mesh layer, a water heat exchange membrane, a second supporting mesh layer and a second hot melt adhesive layer, the first and second supporting mesh layers and the water heat exchange membrane are bonded together by the first and second hot melt adhesive layers, and the water heat exchange membrane is a flexible porous material that is water-permeable and air-tight. After all the water heat exchange membrane assemblies are stacked in pairs and placed in an oven, the forming and sealing of the water heat exchange device body can be completed at one time, which has the advantages of simplicity and high efficiency and is suitable for mass production.

Description

Technical Field

[0001] The present application relates to the field of fuel cells, and in particular to a water heat exchange device for fuel cells. Background Art

[0002] Fuel cells are clean, efficient, and long-life power generation devices. Compared to conventional power generation technologies, fuel cells offer significant advantages in efficiency, safety, reliability, flexibility, cleanliness, and operational performance, and hold broad application prospects.

[0003] Many fuel cells use an internal membrane, such as a PEM-type fuel cell that includes a proton exchange membrane (also known as a polymer electrolyte membrane). To operate within a higher efficiency range, it is desirable to keep the membrane moist. Maintaining membrane humidity helps avoid damage or shortened lifespan of the membrane, as well as maintain desired operating efficiency. Lower water content in the membrane results in a higher proton conduction resistance, which in turn results in higher ohmic voltage losses. Humidification of the inlet air (especially at the cathode inlet) is beneficial to maintain an adequate water content in the membrane.

[0004] The water heat exchange device for fuel cells in the prior art has a complex structure and requires fasteners and seals, which on the one hand leads to increased costs, and on the other hand these fasteners and seals are also prone to defects, resulting in a shortened service life.

[0005] Therefore, there is an urgent need in the art to develop a water heat exchange device for a fuel cell that has a simple structure and a long service life. Summary of the Invention

[0006] The purpose of the present application is to provide a water heat exchange device for a fuel cell, which has a simple structure and a long service life.

[0007] The present application provides a water heat exchange membrane assembly for a water heat exchange device of a fuel cell, the water heat exchange membrane assembly including at least one water heat exchange membrane assembly unit, the water heat exchange membrane assembly unit including a five-in-one diaphragm structure and a supporting frame that are stacked and compositely formed; the five-in-one diaphragm structure includes, from top to bottom, a first hot melt adhesive layer, a first supporting mesh layer, a water heat exchange membrane, a second supporting mesh layer and a second hot melt adhesive layer, the first and second supporting mesh layers and the water heat exchange membrane are bonded together by the first and second hot melt adhesive layers, and the water heat exchange membrane is a flexible porous material that is water permeable and airtight.

[0008] In another preferred embodiment, the five-in-one diaphragm structure and the supporting frame are stacked alternately.

[0009] In another preferred embodiment, the water heat exchange membrane assembly includes a five-in-one membrane structure and a supporting frame stacked together.

[0010] In another preferred embodiment, the water heat exchange membrane assembly includes two five-in-one membrane structures stacked together, and a supporting frame located between the two five-in-one membrane structures.

[0011] In another preferred embodiment, a gas flow channel is provided between the two five-in-one diaphragm structures separated by the one supporting frame.

[0012] In another preferred embodiment, the gas flow channel is an exhaust flow channel or an intake flow channel.

[0013] In another preferred embodiment, adjacent exhaust flow channels and intake flow channels are in opposite directions to each other.

[0014] In another preferred embodiment, exhaust gas and intake air flow through both sides (ie, the two main surface sides) of the water heat exchange membrane respectively.

[0015] In another preferred embodiment, the water heat exchange membrane assembly includes 2N+1 five-in-one membrane structures and 2N supporting frames stacked alternately, wherein N is a positive integer ≥1.

[0016] In another preferred embodiment, the water heat exchange membrane assembly includes 2N five-in-one membrane structures and 2N+1 supporting frames that are alternately stacked, wherein N is a positive integer ≥1.

[0017] In another preferred embodiment, the surface or gaps of the water heat exchange membrane are filled with resin.

[0018] In another preferred embodiment, the resin includes but is not limited to sulfonic acid resin or perfluorosulfonic acid resin.

[0019] In another preferred embodiment, the water heat exchange membrane assembly is a plate structure.

[0020] In another preferred embodiment, the thickness of the five-in-one diaphragm structure is 0.4 mm-0.6 mm.

[0021] In another preferred embodiment, the five-in-one diaphragm structure further includes a sealing frame formed by the first and / or second hot melt adhesive layer.

[0022] In another preferred embodiment, the area ratio of the first or second hot melt adhesive layer, the first or second support mesh layer and the water heat exchange membrane is (0.1-0.3):1.0:(0.6-0.9).

[0023] In another preferred embodiment, the first and second hot melt adhesive layers are arranged around the supporting mesh layer.

[0024] In another preferred embodiment, the first hot melt adhesive layer and the second hot melt adhesive layer are the same.

[0025] In another preferred embodiment, the water heat exchange membrane is selected from the following group: expanded polytetrafluoroethylene film and ultra-high molecular polyethylene film.

[0026] In another preferred embodiment, the mesh size of the first and / or second support mesh layer is between 5 mesh and 500 mesh.

[0027] In another preferred embodiment, the first support mesh layer and the second support mesh layer are the same.

[0028] In another preferred embodiment, the first and / or second supporting mesh layer is in the form of a woven mesh or a biaxially stretched mesh.

[0029] In another preferred embodiment, the material of the first and / or second supporting mesh layer is selected from the following group: nylon, PVC and PET.

[0030] In another preferred embodiment, the supporting frame is a rectangular parallelepiped crisscrossing frame structure.

[0031] In another preferred embodiment, the support frame is made of plastic and formed by injection molding.

[0032] In another preferred embodiment, support points are provided at the crisscross points of the support frame, and the spacing between adjacent support points is between 5-20 mm.

[0033] In another preferred embodiment, the thickness of the support frame is 1-3 mm, preferably 2 mm.

[0034] In another preferred example, the support frame is provided with an inlet structure and an outlet structure for gas entry and exit, and the inlet structure and the outlet structure are arranged at the diagonals of the support frame. The inlet structure and the outlet structure cooperate with the adjacent five-in-one diaphragm structure to form an inlet or outlet of the gas flow channel.

[0035] The present application also provides a water heat exchange device for a fuel cell, wherein the water heat exchange device comprises one or more water heat exchange membrane assemblies as described above.

[0036] In another preferred embodiment, two adjacent supporting frames of the water heat exchange membrane assembly unit are stacked in opposite directions, so that the adjacent gas flow channels are two intersecting independent gas flow channels.

[0037] In another preferred embodiment, the water heat exchange device includes 20-200 five-in-one diaphragm structures.

[0038] In another preferred embodiment, the height of the water heat exchange device is 10-100 cm, preferably 20 cm-50 cm.

[0039] The present application also provides a fuel cell system, which includes a fuel cell unit and the above-mentioned water heat exchange device for the fuel cell connected to the fuel cell unit.

[0040] The present application also provides a method for preparing the above-mentioned water heat exchange membrane assembly, comprising the following steps:

[0041] (a) providing a stacking structure, the stacking structure comprising a plurality of stacking structural units, each of the stacking structural units comprising a stacked five-in-one membrane structure and a supporting frame; the five-in-one membrane structure comprising, from top to bottom, a first hot melt adhesive layer, a first supporting mesh layer, a water heat exchange membrane, a second supporting mesh layer, and a second hot melt adhesive layer, the first and second supporting mesh layers and the water heat exchange membrane being bonded together by the first and second hot melt adhesive layers, and the water heat exchange membrane being a flexible porous material that is water permeable and airtight;

[0042] (b) heating the stacked structure to melt the hot melt adhesive in the stacked structure; and

[0043] (c) Cooling the stacked structure to solidify the melted hot melt adhesive, thereby forming a water heat exchange membrane assembly.

[0044] In another preferred embodiment, in step (b), the temperature is heated to T1, wherein T1 is the melting point of the hot melt adhesive ±10°C, preferably T1 is the melting point of the hot melt adhesive.

[0045] In another preferred embodiment, step (b) includes the steps of: clamping the stacked structure, and then heating the clamped stacked structure.

[0046] In another preferred embodiment, the support frames of two adjacent stacked structural units are stacked in opposite directions, so that the gas flow channels of the two adjacent support frames are two intersecting independent gas flow channels.

[0047] In another preferred embodiment, in step (c), the temperature is lowered to room temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. It should be understood that the drawings described below are merely some implementation examples of the present invention, and those skilled in the art can also derive other implementation examples based on these drawings without inventive effort.

[0049] Figure 1 is a top view of the five-in-one diaphragm structure according to the present application;

[0050] Figure 2is a top view of the support frame according to the present application;

[0051] Figure 3 is a cross-sectional view of a water heat exchange device for a fuel cell according to the present application;

[0052] Figure 4 is a cross-sectional view of a five-in-one diaphragm structure according to the present application;

[0053] Figure 5 It is a top view of the supporting mesh layer of the five-in-one diaphragm structure according to the present application.

[0054] In the accompanying drawings, the symbols are as follows:

[0055] 1-Water heat exchange membrane module unit

[0056] 10-Five-in-one diaphragm structure

[0057] 11-Water heat exchange membrane

[0058] 121-first support mesh layer

[0059] 122-Second support mesh layer

[0060] 13-Hot melt adhesive layer

[0061] 131-first hot melt adhesive layer

[0062] 132-Second hot melt adhesive layer

[0063] 14-Sealed border

[0064] 20-Supporting frame

[0065] 21-Support Point

[0066] 22-Entrance structure

[0067] 23-Export structure DETAILED DESCRIPTION

[0068] After extensive and in-depth research, the inventors have developed a novel water-heat exchange device for fuel cells. This device features a simple structure, eliminating the need for thin plates and directly replacing them with hot-melt adhesive. A water-permeable membrane is wrapped between two layers of hot-melt adhesive. During preparation, two sets of hot-melt adhesive sheets, oriented in different directions, are stacked and then baked to achieve overall fusion, allowing the water-permeable membrane and the hot-melt adhesive to form a single, integrated structure. This not only provides a more rigid structure but also enhances water-heat exchange efficiency. Furthermore, the water-heat exchange device for fuel cells of the present invention effectively maintains a moist fuel cell membrane during operation and offers a long service life.

[0069] Main advantages of the present invention

[0070] (a) After all five-in-one diaphragm structures and supporting frames are stacked, the water heat exchange device of the present application is connected and sealed by hot melt adhesive without using fasteners and seals.

[0071] (b) The fine mesh and support points in the skeleton of the water heat exchange device of the present application provide good support for the water heat exchange membrane and can withstand a pressure difference within 2 bar.

[0072] (c) The water heat exchange device of the present application has a simple structure, high space utilization, low manufacturing cost, and is suitable for mass production.

[0073] In the following description, many technical details are provided to help readers better understand this application. However, those skilled in the art will understand that even without these technical details and various changes and modifications based on the following embodiments, the technical solutions claimed in this application can be implemented.

[0074] the term

[0075] The terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article or apparatus comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article or apparatus. Without further restriction, an element defined by the phrase "comprising a" does not exclude the presence of other identical elements in the process, method, article or apparatus comprising the element. In the application documents of this patent, if it is mentioned that an action is performed according to an element, it means that the action is performed at least according to the element, which includes two situations: performing the action only according to the element, and performing the action according to the element and other elements. Expressions such as multiple, multiple times, and a variety include 2, 2 times, 2 kinds, and more than 2, more than 2 times, and more than 2 kinds.

[0076] In the present invention, all directional indications (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0077] The structure of the five-in-one diaphragm:

[0078] The five-in-one diaphragm structure of the present invention includes, from top to bottom, a first hot melt adhesive layer, a first support mesh layer, a water heat exchange membrane, a second hot melt adhesive layer, and a second support mesh layer. The first and / or second support mesh layer is bonded to the water heat exchange membrane through the hot melt adhesive layer. In other words, the middle layer is the water heat exchange membrane, and the two sides that are in close contact with the water heat exchange membrane of the middle layer are the support mesh. Preferably, the area ratio of the hot melt adhesive layer, the support mesh layer, and the water heat exchange membrane is (0.1-0.3):1.0:(0.6-0.9), because the shapes of humidifiers of different specifications will be different. Preferably, the hot melt adhesive layer is arranged around the support mesh layer.

[0079] The five-in-one membrane structure of the present application is not just five layers, but rather a five-layer structure after hot pressing and lamination. The five-in-one membrane structure may include, from top to bottom, a first hot melt adhesive layer, a first support mesh layer, a second hot melt adhesive layer, a water heat exchange membrane, a third hot melt adhesive layer, a second support mesh layer, and a fourth hot melt adhesive layer.

[0080] The water heat exchange membrane is a flexible porous material, including but not limited to expanded polytetrafluoroethylene film, ultra-high molecular polyethylene film, etc. Its surface or pores are filled with resin, including but not limited to perfluorosulfonic acid resin, so that the film has the function of being water-permeable but not air-permeable.

[0081] Preferably, the first and / or second support mesh layers are the same; the mesh openings of the first and / or second support mesh layers range from 5 mesh to 500 mesh, preferably from 15 mesh to 50 mesh, and are in the form of a woven mesh or a biaxially stretched mesh, and the materials include but are not limited to nylon, PVC, PET, etc.

[0082] The five-in-one membrane structure is held together with hot melt adhesive. In addition to bonding the water heat exchange membrane to the support mesh, the hot melt adhesive also forms a thick frame. The thickness of the five-in-one membrane structure ranges from 0.4mm to 0.6mm.

[0083] Support frame:

[0084] The support frame is made of plastic, injection-molded, with a thickness of 1-3mm, preferably 2mm. It has a mesh of support points in the center, spaced 5-20mm apart. The support frame is provided with inlet and outlet structures for gas flow, located at opposite corners of the support frame. These inlet and outlet structures, in conjunction with the adjacent five-in-one diaphragm structure, form the inlet and outlet of the gas flow channel.

[0085] Water heat exchange membrane assembly for a water heat exchange device of a fuel cell

[0086] The water-heat exchange membrane assembly includes at least one water-heat exchange assembly unit, which comprises a five-in-one diaphragm structure and a support frame that are stacked and compositely formed. The five-in-one diaphragm structures and support frame are alternately stacked, and a gas flow channel is provided between two five-in-one diaphragm structures separated by a support frame. The gas flow channel can be an exhaust flow channel or an intake flow channel.

[0087] The water heat exchange membrane assembly may include a five-in-one membrane structure stacked together and a support frame. The water heat exchange membrane assembly may include two five-in-one membrane structures stacked together and a support frame located between the two five-in-one membrane structures. Preferably, the water heat exchange membrane assembly is a plate structure.

[0088] Preferably, the water heat exchange membrane assembly may include 2N+1 five-in-one membrane structures and 2N supporting frames that are alternately stacked, wherein N is a positive integer ≥1.

[0089] Preferably, the water heat exchange membrane assembly may include 2N five-in-one membrane structures and 2N+1 supporting frames that are alternately stacked, wherein N is a positive integer ≥1.

[0090] Water heat exchange device for fuel cell

[0091] The water heat exchange device includes a plurality of stacked water heat exchange membrane modules, wherein the support frames of two adjacent water heat exchange membrane module units are stacked in opposite directions so that the gas flow channels of the two adjacent support frames are two intersecting independent gas flow channels.

[0092] Preferably, the water heat exchange device includes 20-200 water heat exchange membrane assembly units.

[0093] Preferably, the height of the water heat exchange device is 20cm-50cm.

[0094] fuel cell system

[0095] The fuel cell system of the present application includes a fuel cell unit and the above-mentioned water heat exchange device for the fuel cell connected to the fuel cell unit.

[0096] Preparation method of water heat exchange membrane assembly:

[0097] (a) providing a stacking structure, the stacking structure comprising a plurality of stacking structural units, each of the stacking structural units comprising a stacked five-in-one membrane structure and a supporting frame; the five-in-one membrane structure comprising, from top to bottom, a first hot melt adhesive layer, a first supporting mesh layer, a water heat exchange membrane, a second supporting mesh layer, and a second hot melt adhesive layer, the first and second supporting mesh layers and the water heat exchange membrane being bonded together by the first and second hot melt adhesive layers, and the water heat exchange membrane being a flexible porous material that is water permeable and airtight;

[0098] (b) heating the stacked structure to melt the hot melt adhesive in the stacked structure; and

[0099] (c) Cooling the stacked structure to solidify the melted hot melt adhesive, thereby forming a water heat exchange membrane assembly.

[0100] Preferably, in step (b), the temperature is heated to T1, wherein T1 is the melting point of the hot melt adhesive ±10°C, and preferably T1 is the melting point of the hot melt adhesive.

[0101] Preferably, step (b) includes the steps of: clamping the stacked structure and then heating the clamped stacked structure.

[0102] Preferably, the support frames of two adjacent stacked structural units are stacked in opposite directions, so that the gas flow channels of the two adjacent support frames are two intersecting independent gas flow channels.

[0103] Preferably, in step (c), the temperature is lowered to room temperature.

[0104] Example 1

[0105] refer to Figure 1-5 The present invention provides a water heat exchange device for a fuel cell, the water heat exchange device includes a plurality of water heat exchange membrane assemblies, the water heat exchange membrane assemblies include a plurality of water heat exchange membrane assembly units 1, preferably, the water heat exchange membrane assembly is a plate structure;

[0106] The water heat exchange membrane assembly unit 1 includes three five-in-one diaphragm structures 10 and two support frames 20 stacked together, wherein the five-in-one diaphragm structures 10 and the support frames 20 are stacked alternately. A gas flow channel is provided between two five-in-one diaphragm structures separated by a support frame. Specifically, an inlet structure 22 and an outlet structure 23 for gas in and out are provided on the support frame 20. The inlet structure 22 and the outlet structure 23 are arranged at the diagonal positions of the support frame 20. The inlet structure 22 and the outlet structure 23 cooperate with the adjacent five-in-one diaphragm structures to form the inlet or outlet of the gas flow channel. The gas flow channel is an exhaust flow channel or an intake flow channel. The adjacent exhaust flow channels and intake flow channels are opposite to each other. That is to say, the two adjacent support frames of the water heat exchange membrane assembly unit 1 are stacked in opposite directions, so that the adjacent gas flow channels are two independent gas flow channels that intersect.

[0107] The five-in-one diaphragm structure 10 includes, from top to bottom: a first hot melt adhesive layer 131, a first support mesh layer 121, a water heat exchange membrane 11, a second support mesh layer 122 and a second hot melt adhesive layer 132, wherein the first and / or second support mesh layer and the water heat exchange membrane are bonded together by the first and / or second hot melt adhesive layer, and the water heat exchange membrane 11 is a flexible porous material that is water-permeable and air-tight, including but not limited to expanded polytetrafluoroethylene film or ultra-high molecular polyethylene film; in other embodiments, the five-in-one diaphragm structure 1 includes, from top to bottom, a first hot melt adhesive layer, a first support mesh layer, a second hot melt adhesive layer water heat exchange membrane, a third hot melt adhesive layer, a second support mesh layer, and a fourth hot melt adhesive layer. That is to say, the five-in-one diaphragm structure of the present invention does not have only five layers, but is a five-layer structure after hot pressing and compounding.

[0108] The first hot melt adhesive layer 131 and the second hot melt adhesive layer 132 are identical, the first support mesh layer 121 and the second support mesh layer 122 are identical, and the area ratio of the first and / or second hot melt adhesive layer, the first and / or second support mesh layer, and the water heat exchange membrane is (0.1-0.3):1.0:(0.6-0.9). Because humidifiers of different specifications have different shapes, the water heat exchange membrane may have different sizes. The hot melt adhesive layer 13 not only bonds the support mesh layer and the water heat exchange membrane 11 together, but also forms a sealing frame 14 of a certain thickness around the outer periphery of the support mesh layer.

[0109] Exhaust and intake air flow through both sides (i.e., the two main surface sides) of the water heat exchange membrane, respectively. The surface or gaps of the water heat exchange membrane 11 are filled with a resin, which includes but is not limited to a perfluorosulfonic acid resin. The support mesh layer (the first support mesh layer 121 and / or the second support mesh layer 122) is in the form of a woven mesh or a biaxially stretched mesh. The mesh openings of the support mesh layer (the first support mesh layer 121 and / or the second support mesh layer 122) are between 5 mesh and 500 mesh. The material of the first and / or second support mesh layer can be nylon, PVC, or PET.

[0110] In this embodiment, the support skeleton 20 is a rectangular crisscross skeleton structure. The support skeleton is made of plastic and is formed by injection molding. Support points 21 are provided at the crisscross points of the support skeleton 20. Preferably, the spacing between adjacent support points 21 is between 5-20 mm, and the thickness of the support skeleton 20 is 1-3 mm.

[0111] The method for preparing a water heat exchange device for a fuel cell is as follows: stacking 2N+1 five-in-one diaphragm structures 10 and 2N support skeletons 20 (N is a natural number, and the size of N is selected according to needs), wherein two adjacent support skeletons 20 are stacked in opposite directions so that the gas flow channels of the two adjacent support skeletons are two independent gas flow channels that intersect. That is to say, after the two sides of the support skeleton 20 are compounded with the five-in-one diaphragm structure 10, a closed channel is formed inside the support skeleton 20; then another support skeleton 20 is stacked in reverse and compounded with a five-in-one diaphragm structure 10 to form two independent flow channels that intersect, that is, the odd-numbered support skeletons 20 are placed in the same direction, but the even-numbered support skeletons 20 are flipped relative to the adjacent odd-numbered support skeletons 20 (in the opposite direction); this is stacked forward and backward to form a two-way gas channel group that interacts layer by layer. Then, the multiple stacked water heat exchange membrane assemblies are clamped with a clamping tool, placed in an oven and heated to the melting point of the hot melt adhesive, and finally cooled to room temperature, thereby forming a water heat exchange device for a fuel cell.

[0112] All documents mentioned in this application are considered to be included in their entirety in the disclosure of this application so that they can be used as a basis for modification when necessary. In addition, it should be understood that after reading the above disclosure of this application, those skilled in the art may make various changes or modifications to this application, and these equivalent forms also fall within the scope of protection claimed in this application.

Claims

1. A water heat exchange device for a fuel cell, characterized in that: The water heat exchange device includes a water heat exchange membrane assembly, which includes at least one water heat exchange membrane assembly unit, and the water heat exchange membrane assembly unit includes a five-in-one membrane structure and a support frame that are stacked and compositely formed; the five-in-one membrane structure includes, from top to bottom, a first hot melt adhesive layer, a first supporting mesh layer, a water heat exchange membrane, a second supporting mesh layer, and a second hot melt adhesive layer, the first supporting mesh layer and the second supporting mesh layer being bonded to the water heat exchange membrane by the first hot melt adhesive layer and the second hot melt adhesive layer, and the water heat exchange membrane is a flexible porous material that is water-permeable and air-impermeable; The first hot melt adhesive layer and the second hot melt adhesive layer are arranged around the supporting mesh layer, and the mesh openings of the first supporting mesh layer and / or the second supporting mesh layer are between 15 mesh and 50 mesh; the first supporting mesh layer and / or the second supporting mesh layer are in the form of a woven mesh or a biaxially stretched mesh, and the five-in-one diaphragm structure further includes a sealing frame formed by the first hot melt adhesive layer and / or the second hot melt adhesive layer; The support frame is a rectangular parallelepiped crisscross frame structure, the support frame is made of plastic and formed by injection molding, support points are provided at the crisscross points of the support frame, the spacing between adjacent support points is between 5-20 mm, the thickness of the support frame is 1-3 mm, and the thickness of the five-in-one diaphragm structure is 0.4 mm-0.6 mm; When preparing the water heat exchange device for fuel cells, a stacking structure is provided, which includes multiple water heat exchange membrane assembly units, wherein the five-in-one diaphragm structure and the support frame are stacked alternately, and two adjacent support frames are stacked in opposite directions. A gas flow channel is provided between two five-in-one diaphragm structures separated by a support frame, so that the gas flow channels of the two adjacent support frames are two intersecting independent gas flow channels; the stacking structure is clamped, and then the clamped stacking structure is heated to melt the hot melt adhesive in the stacking structure, and finally cooled to room temperature, thereby forming the water heat exchange device for fuel cells.

2. The water heat exchange device according to claim 1, characterized in that: The water heat exchange membrane assembly comprises a five-in-one membrane structure and a supporting frame stacked together.

3. The water heat exchange device according to claim 1, characterized in that: The gas flow channel is an exhaust flow channel or an intake flow channel.

4. The water heat exchange device according to claim 3, characterized in that: Adjacent exhaust flow channels and intake flow channels are in opposite directions to each other.

5. The water heat exchange device according to claim 1, characterized in that: The water heat exchange membrane assembly includes 2N+1 five-in-one membrane structures and 2N supporting frames that are alternately stacked, wherein N is a positive integer ≥1.

6. The water heat exchange device according to claim 1, characterized in that: The water heat exchange membrane assembly includes 2N five-in-one membrane structures stacked alternately and 2N+1 supporting frames, where N is a positive integer ≥1.

7. The water heat exchange device according to claim 1, characterized in that: The surface or gaps of the water heat exchange membrane are filled with resin.

8. The water heat exchange device according to claim 7, characterized in that: The resin includes but is not limited to sulfonic acid resin or perfluorosulfonic acid resin.

9. The water heat exchange device according to claim 1, characterized in that: The water heat exchange membrane component is a plate structure.

10. The membrane assembly of the water heat exchange device according to claim 1, characterized in that: The area ratio of the first hot melt adhesive layer or the second hot melt adhesive layer, the first support mesh layer or the second support mesh layer and the water heat exchange membrane is (0.1-0.3):1.0:(0.6-0.9).

11. The water heat exchange device according to claim 1, characterized in that: The first hot melt adhesive layer and the second hot melt adhesive layer are identical.

12. The water heat exchange device according to claim 1, wherein: The water heat exchange membrane is selected from the following group: expanded polytetrafluoroethylene film and ultra-high molecular polyethylene film.

13. The water heat exchange device according to claim 1, wherein: The first supporting mesh layer and the second supporting mesh layer are identical.

14. The water heat exchange device according to claim 1, wherein: The material of the first supporting mesh layer and / or the second supporting mesh layer is selected from the following group: nylon, PVC and PET.

15. The water heat exchange device according to claim 1, wherein: The thickness of the supporting frame is 2 mm.

16. The water heat exchange device according to claim 1, characterized in that: The support frame is provided with an inlet structure and an outlet structure for gas in and out. The inlet structure and the outlet structure are arranged at the diagonals of the support frame. The inlet structure and the outlet structure cooperate with the adjacent five-in-one diaphragm structure to form the inlet or outlet of the gas flow channel.

17. The water heat exchange device for a fuel cell according to claim 1, wherein: The water heat exchange device includes 20-200 five-in-one diaphragm structures.

18. A fuel cell system, characterized in that: The system comprises a fuel cell unit and a water heat exchange device for a fuel cell according to any one of claims 1 to 17 connected to the fuel cell unit.

19. A method for preparing a water heat exchange membrane assembly for a water heat exchange device for a fuel cell according to claim 1, characterized in that: The following steps are involved: (a) providing a stacking structure, the stacking structure comprising a plurality of stacking structural units, each of the stacking structural units comprising a stacked five-in-one diaphragm structure and a supporting frame; The five-in-one membrane structure comprises, from top to bottom, a first hot melt adhesive layer, a first supporting mesh layer, a water heat exchange membrane, a second supporting mesh layer, and a second hot melt adhesive layer. The first supporting mesh layer and the second supporting mesh layer are bonded to the water heat exchange membrane via the first hot melt adhesive layer and the second hot melt adhesive layer. The water heat exchange membrane is a flexible porous material that is water-permeable but air-tight. (b) heating the stacked structure to melt the hot melt adhesive in the stacked structure; and (c) cooling the stacked structure to solidify the melted hot melt adhesive, thereby forming a water heat exchange membrane assembly.

20. The method for preparing a water heat exchange membrane assembly according to claim 19, wherein: In step (b), heating is performed to a temperature T1, wherein T1 is the melting point of the hot melt adhesive ±10°C.

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