Wearable miniature direct methanol fuel cell flexible array

Abstract

The invention provides a wearable miniature direct methanol fuel cell flexible array. The lithium ion battery comprises a flexible packaging layer, a plurality of cathode plate reversely-buckled single batteries and a circuit board, the negative electrode plate reversely-buckled single battery comprises a positive electrode plate, a membrane electrode, a reversely-buckled negative electrode plate and a positive electrode end plate; a through groove is formed in the center of the anode end plate, and a plurality of clamping grooves are formed in the upper end surface; the reversely-buckled cathode plate is of an integrally-formed structure and comprises a cathode plate body and extension arms with the same number as the clamping grooves. The extension arm extends into the clamping groove of the anode end plate from the outer side edge of the cathode plate body, and the anode end plate, the anode plate and the membrane electrode are wrapped by the extension arm. The contradiction between light weight and assembly pressure is solved through the reverse buckling type polar plate structure, mechanical flexibility is achieved by combining broken line wire bridging and flexible material split packaging, the sealing reliability is guaranteed through the limiting groove and the integrated pouring technology, and the flexible array makes breakthroughs in energy density, mechanical adaptability and cruising ability.

Description

Technical Field

[0001] This invention belongs to the field of wearable energy technology and relates to a wearable micro direct methanol fuel cell flexible array. Background Technology

[0002] In recent years, wearable sensing technology has developed rapidly, and correspondingly, the development of wearable energy modules with high energy density has become a research focus. Wearable energy devices are mainly divided into self-powered and battery-powered types. Self-powered devices utilize different sources such as solar energy, thermal energy, and kinetic energy for self-powering, but their energy harvesting efficiency is easily limited by environmental conditions (such as sunlight intensity and temperature changes), resulting in insufficient power supply in certain situations. Battery-powered devices include lithium batteries and fuel cells. Solid-state or flexible lithium batteries pose certain safety risks due to their flammability and explosiveness. Micro direct methanol fuel cells (µDMFCs) are promising for use in wearable electronics due to their high energy density, direct use of liquid fuel, and environmental friendliness. However, traditional µDMFCs employ a completely rigid structural design, resulting in excessive weight and volume, severely limiting their application in wearable devices. This design not only requires the use of threaded fasteners to fix rigid end plates, but also necessitates assembling individual cells onto rigid substrates such as silicon wafers or printed circuit boards (PCBs) when constructing the battery array, leading to an increase in the overall system weight and volume, and a significant reduction in energy density. In recent years, fully flexible methanol fuel cells have been developed to apply µDMFCs in wearable devices. However, the low power density of fully flexible methanol fuel cells, which cannot support sufficient assembly pressure, also limits their practical application. Therefore, it is necessary to develop a lightweight µDMFC and its array with high power density. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a wearable micro direct methanol fuel cell flexible array.

[0004] The present invention provides a wearable micro direct methanol fuel cell flexible array, including a flexible encapsulation layer, a circuit board disposed within the flexible encapsulation layer, and multiple series-connected cathode plates in reverse clasp single cells. The cathode plate reverse coin cell includes: Anode plate; A membrane electrode is disposed below the anode plate; A reverse-mounted cathode plate is disposed below the anode plate; Anode electrode plate, which is arranged above the anode electrode plate; The anode plate has a through groove in the center and multiple slots on its upper surface. The reverse-clamped cathode plate is an integrally formed structure, including a cathode plate body and an extension arm with the same number of slots; the extension arm extends from the outside of the cathode plate body to the slot of the anode plate, and the extension arm wraps the anode plate, the anode plate, and the membrane electrode inside.

[0005] Preferably, the lower end face of the anode plate is provided with a limiting groove that perfectly accommodates the anode plate. More preferably, the depth of the limiting groove of the anode plate is less than the thickness of the anode plate.

[0006] Preferably, the cathode plate body and anode plate of the reverse-mounted cathode plate have multiple small holes.

[0007] Preferably, the circuit board includes the same number of conductive components as the cathode plate reverse-button single cell, the conductive components including cathode conductive components and anode conductive components; the cathode conductive components are located between the reverse-button cathode plate and the membrane electrode of the cathode plate reverse-button single cell, the side of the cathode conductive components near the reverse-button cathode plate is made of conductive metal material, and the side near the membrane electrode is made of insulating material; the anode conductive components are connected to the anode plate and are made of conductive metal material.

[0008] Preferably, adjacent conductive components are connected by metal wires, and the metal wires are zigzag lines, more preferably serpentine zigzag lines.

[0009] Preferably, the flexible encapsulation layer includes an upper encapsulation layer and a lower encapsulation layer; The lower encapsulation layer is disposed on the anode end plate side of the cathode plate reverse coin cell, and it has windows corresponding to the positions of all cathode plate reverse coin cells. The window corresponds to a through groove in the center of the anode end plate of a cathode plate reverse coin cell. The upper encapsulation layer is positioned above the lower encapsulation layer and contains a liquid storage chamber for holding methanol; the liquid storage chamber encloses all windows.

[0010] Preferably, the flexible encapsulation layer is made of silicone. More preferably, the flexible encapsulation layer is prepared by a casting and curing method.

[0011] The beneficial effects of the present invention include at least the following: 1. This invention utilizes the reverse clamping of the cathode plate to create a self-locking force, thereby reducing weight and volume by removing the anode plate while providing suitable assembly pressure. Under this pressure, contact resistance is minimized, and the porosity of the gas diffusion layer is not excessively compressed, thus improving power density.

[0012] 2. This invention utilizes zigzag metal wires to form a "bridging" structure, namely an "island-bridge structure," to absorb bending stress; the liquid storage chamber provides centralized liquid supply, reducing the risk of leakage. The synergy of these three elements enables the array to achieve a 10% elongation, 180° bending, and arbitrary torsion, overcoming the limitations of rigid substrates in wearable applications.

[0013] 3. This invention utilizes a limiting groove to provide pre-tightening force; perforations in the electrode plates ensure uniform mass transfer; and the precise fit between the extension arm and the slot prevents misalignment. Combined with silicone casting for sealing, the array maintains zero-leakage operation even under dynamic deformation.

[0014] In summary, this invention resolves the contradiction between lightweight design and assembly pressure through a reverse-clamp electrode structure, achieves mechanical flexibility by combining folded wire bridging with flexible material split packaging, and ensures sealing reliability with limiting grooves and integrated casting process. This enables the flexible array to achieve breakthroughs in energy density, mechanical adaptability, and battery life, making it suitable for the expanded application of wearable energy devices. Attached Figure Description

[0015] To more clearly illustrate the technical solution of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the front structure of a wearable micro direct methanol fuel cell flexible array provided in an embodiment of the present invention.

[0017] Figure 2 This is a schematic diagram of the front structure of a wearable micro direct methanol fuel cell flexible array (with the upper encapsulation layer removed) provided in an embodiment of the present invention.

[0018] Figure 3 This is a schematic diagram of the back structure of a wearable micro direct methanol fuel cell flexible array provided in an embodiment of the present invention.

[0019] Figure 4 This is a schematic diagram of a single cathode plate reverse-button cell structure provided in an embodiment of the present invention; wherein (a) is a side cross-sectional view, (b) is a top view, and (c) is a side cross-sectional view of the cathode plate reverse-button cell located in a flexible cell array.

[0020] Figure 5 This is a schematic diagram of the anode end plate structure provided in an embodiment of the present invention; wherein (a) is a front perspective view and (b) is a rear perspective view.

[0021] Figure 6This is a schematic diagram of the electrode structure provided in an embodiment of the present invention; wherein (a) is the anode electrode and (b) is the reverse-mounted cathode electrode.

[0022] Figure 7 This is a schematic diagram of a circuit board structure provided in an embodiment of the present invention; wherein (a) is a front view and (b) is a rear view.

[0023] Figure 8 The diagram shows the casting template for the encapsulation layer; where (a) is the casting template for the lower encapsulation layer and (b) is the casting template for the upper encapsulation layer.

[0024] Figure 9 The values ​​represent the performance of a single cell under different assembly pressures; where (a) represents a 2M methanol concentration, (b) represents a 4M methanol concentration, and (c) represents a 6M methanol concentration.

[0025] Figure 10 This refers to the output performance of a single battery.

[0026] Figure 11 The present invention provides a flexible test result for a wearable micro direct methanol fuel cell flexible array.

[0027] The diagram shows the following markings: 1. Flexible encapsulation layer; 11. Upper encapsulation layer; 111. Liquid reservoir; 12. Lower encapsulation layer; 121. Window; 2. Cathode plate reverse-button single cell; 21. Anode plate; 211. Pin; 22. Membrane electrode; 23. Reverse-button cathode plate; 231. Cathode plate body; 232. Extension arm; 24. Anode plate; 241. Through slot; 242. Slot; 243. Limiting slot; 3. Circuit board; 31. Conductive component; 311. Cathode conductive component; 312. Anode conductive component; 32. Metal wire; 33. Cathode pad; 34. Anode pad. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0029] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0030] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] This embodiment provides a wearable micro direct methanol fuel cell flexible array, such as Figure 1-3 It includes a flexible encapsulation layer 1, a flexible circuit board 3 disposed within the flexible encapsulation layer 1, and a plurality of cathode plates in series reverse-button single cells 2. See appendix Figure 4 (a) Figure 4 In (b), the cathode plate reverse-button single cell 2 includes: an anode plate 21, a membrane electrode 22, a reverse-button cathode plate 23, and an anode plate 24; See Appendix for details. Figure 5 (a) Figure 5 In (b), the anode plate 24 is disposed above the anode plate 21, with a through groove 241 in its center and multiple slots 242 on its upper surface. As an example, in this embodiment, the anode plate 24 has a diameter of 11 mm, a thickness of 1.5 mm, a circular cross-section, a square through groove 241, and four slots 242, all of which are distributed on the upper surface of the anode plate 24.

[0033] Furthermore, the lower end face of the anode plate 24 is provided with a limiting groove 243 that perfectly accommodates the anode plate 21. More preferably, the depth of the limiting groove 243 of the anode plate 24 is less than the thickness of the anode plate 21. As an example, in this embodiment, the limiting groove 243 is circular to ensure the embedding of the anode plate 21. The depth of the limiting groove 243 is 0.35 mm, which is less than the thickness of the anode plate 21 (0.4 mm) to ensure clamping force during assembly. The anode plate 24 can be 3D printed using high-strength resin. High-strength resin can reduce weight and avoid deformation under pressure, thus affecting performance.

[0034] The reverse-mounted cathode plate 23 is arranged below the anode plate 21, and it is a one-piece molded structure. See attached drawing. Figure 5(a) includes a cathode plate body 231 and an extension arm 232, the same number as the slot 242. The extension arm 232 extends from the outside of the cathode plate body 231 into the slot 242 of the anode plate 24, and encloses the anode plate 24, anode plate 21, and membrane electrode 22. For example, there are four extension arms 232, which bend upwards to extend above the anode plate 24, bend again to fasten the anode plate 24, and are finally pressed together by external pressure. The reverse-clamped cathode plate 23 is made of stainless steel with a thickness of 0.4 mm. The choice of material and thickness ensures that the cathode plate can be bent twice and maintain its deformation, and that it can maintain the clamping force on the internal components after being pressed. The portion of the extension arm 232 of the reverse-clamped cathode plate 23 bent into the slot 242 matches the depth and size of the slot 242 perfectly.

[0035] Further, see Appendix Figure 6 (a) Figure 6 In (b), both the cathode plate body 231 and the anode plate 21 of the reverse-mounted cathode plate 23 have multiple small holes. As an example, the hole structure of the anode plate 21 and the cathode plate body 231 adopts a 3*3 nine-circle hole structure to ensure uniform mass transfer, with an effective anode hole rate of 35.3% and an effective cathode hole rate of 35.3%.

[0036] The membrane electrode 22 is disposed between the anode plate 21 and the cathode plate body 231. As an example, a five-layer membrane electrode 22 (MEA) is fabricated using a gas diffusion electrode method. The MEA includes anode and cathode catalysts, anode and cathode gas diffusion layers, and a proton exchange membrane. The effective area of ​​the MEA is 0.096 cm². 2 Pt / Ru black and Pt black were used as anode and cathode catalysts, respectively.

[0037] See appendix Figure 6 In (a), the anode plate 21 is circular and fits perfectly into the limiting groove 243 of the anode end plate 24. It also has an exposed pin 211 as an electrical connection point, which is connected to the anode conductive component 312 by soldering or conductive silver paste. The anode plate 21 is made of stainless steel and has a thickness of 0.4 mm.

[0038] As an example, the reverse-mounted cathode plate 23 and anode plate 21 can be prepared by laser cutting.

[0039] The cathode plate reverse-mount single cell 2 is assembled by pressing the assembled single cell under pressure in a press to provide sufficient assembly pressure. As an example, the single cell has a diameter of 11 mm and a thickness of 2 mm.

[0040] Further, see Appendix Figure 7(a) Figure 7 In (b), the circuit board 3 includes the same number of conductive components 31 as the cathode plate reverse-button single cell 2, the conductive components including cathode conductive components 311 and anode conductive components 312.

[0041] See appendix Figure 4 In section (c), the cathode conductive component 311 is located between the reverse-button cathode plate 23 and the membrane electrode 22 of the reverse-button single cell 2. The side of the cathode conductive component near the reverse-button cathode plate 23 is made of a conductive metal material, such as copper, while the side near the membrane electrode 22 is made of an insulating material, such as a simple PI substrate. As an example, the cathode conductive component 311 has a ring structure, and its outer end may have a notch corresponding to the position of the extension arm 232 to facilitate the bending of the extension arm 232. The cathode conductive component 311 adopts a ring structure, and its central groove is for realizing material transport and electron conduction on the cathode side.

[0042] The metal wire 32 is connected to the anode plate 21 via the anode conductive component 312, without contacting the membrane electrode 22. This component is made of a conductive metal, such as copper. The cathode conductive component 311 and the anode conductive component 312 are isolated by an insulating material and are not interconnected. As an example, the anode conductive component 312 uses a protruding square metal pad.

[0043] The cathode pad 33 is connected to the cathode conductive component 311 of the first conductive component 31 via a metal wire 32. The cathode conductive component 311 is connected to the reverse cathode plate 23 of the first cathode plate reverse-button single cell 2. The anode plate 21 of the first cathode plate reverse-button single cell 2 is connected to the anode conductive component 312 of the first conductive component 31. The anode conductive component 312 is connected to the next conductive component 31 via a metal wire, until the cathode conductive component 311 of the last conductive component 31 is connected to the reverse cathode plate 23 of the last cathode plate reverse-button single cell 2. The anode plate 21 of the last cathode plate reverse-button single cell 2 is connected to the anode conductive component 312 of the last conductive component 31. The anode conductive component 312 is connected to the anode pad 34 via a metal wire 32.

[0044] The aforementioned metal conductor 32 is a zigzag line, more preferably a serpentine line. The serpentine circuit is a bridge, and the single cell is an island.

[0045] Furthermore, the flexible encapsulation layer 1 includes an upper encapsulation layer 11 and a lower encapsulation layer 12; the lower encapsulation layer 12 is disposed on the anode end plate 24 side of the cathode electrode reverse coin cell 2, and has windows 121 corresponding to the positions of all cathode electrode reverse coin cells, the windows 121 corresponding to a through groove 241 in the center of the anode end plate 24 of a cathode electrode reverse coin cell 2; the upper encapsulation layer 11 is disposed above the lower encapsulation layer 12, and has a liquid storage cavity 111 for placing methanol; the liquid storage cavity 111 encloses all windows 121.

[0046] The flexible encapsulation layer 1 is made of silicone, which can be used to encapsulate multiple series-connected reverse-sided single-cell arrays 2 through an integrated casting and curing method, preventing leakage. The entire flexible battery array can be stretched to a certain length, for example, 10%, and can be bent and twisted arbitrarily, possessing considerable flexibility.

[0047] Performance testing of single cells under different assembly pressures: The polarization curves of the cells were measured at room temperature using a linear voltammetric scan method on an electrochemical workstation at a scan rate of 5 mV / s. -1 The methanol concentration is in the range of 2 mM-6 mM, and the assembly pressure applied by the press is changed. Figure 9 (a) Figure 9 Figure (c) shows the battery performance under different assembly pressures at three methanol concentrations. As can be seen from the figure, at different concentrations, the battery performance initially increases and then decreases with increasing assembly pressure, exhibiting the highest performance at 0.4 MPa. Specifically, the µDMFC shows the best performance at a 4 M methanol concentration and 0.4 MPa. Gradually increasing pressure leads to tighter contact, resulting in a gradual decrease in contact resistance; however, increasing pressure also leads to a gradual decrease in the porosity of the gas diffusion layer, which in turn weakens the gas-liquid two-phase mass transfer capacity (methanol and carbon dioxide at the anode, water discharge at the cathode). The competition between these two factors results in an optimal assembly pressure. This test demonstrates that the µDMFC supports sufficient and suitable assembly pressure, and that the magnitude of the assembly pressure affects the battery's output performance. Single-cell performance testing: The polarization curves of the battery assembled at an assembly pressure of 0.4 MPa were measured at room temperature using a linear voltammetric scan method on an electrochemical workstation at a scan rate of 5 mV / s. -1 The methanol concentration is in the range of 1 mM to 10 mM. For example... Figure 9 As shown, the output performance of this µDMFC initially increases and then decreases with increasing methanol concentration, reaching a maximum power density of 17.5 mW / cm³ at a methanol concentration of 4M. 2The results show that the maximum power density of this µDMFC is among the highest in current wearable µDMFCs, attributed to its ability to support appropriate assembly pressure, thereby enabling close contact between the gas diffusion layer and the electrode, reducing contact resistance, and thus improving performance.

[0048] The wearable island-bridge type flexible battery array μDMFC provided in the above embodiment is designed as a rigid-flexible island-bridge structure, where the cathode plate reverse-button single cell 2 is the island, and multiple single cells are connected by a serpentine circuit as a bridge. The battery array in this embodiment consists of a flexible circuit board 3 (FPCB) and eight cathode plate reverse-button single cells 2. The FPCB is designed with a serpentine hollow structure, including eight conductive components 31 and metal wires for connecting the eight conductive components 31. The conductive components 31 include cathode conductive components 311 and anode conductive components 312. A 0.1 mm thick copper layer is used as the cathode conductive component 311 on the circuit substrate PI, and a protruding square metal pad is provided on the outer edge of the non-copper-covered side of the cathode conductive component 311 as the anode conductive component 312. The eight conductive components 31 are used to mount eight cathode plate reverse-button single cells 2. The FPCB can be stretched by 10%, twisted, and bent. In this embodiment, the eight reverse-node single-cell batteries 2 with cathode plates are connected in series. A serpentine circuit sequentially connects the anode of one reverse-node single-cell battery with cathode plates to the cathode of another reverse-node single-cell battery with cathode plates. The FPCB can be designed to achieve various series and parallel connection methods according to different usage requirements.

[0049] Eight coin cell cathode plates were assembled onto a FPCB, and then a flexible encapsulation layer 1 was fabricated using silicone to create a complete wearable island-bridge type μDMFC array. First, a template for the integrated silicone encapsulation layer was prepared by 3D printing to ensure a perfect bond between the battery array and the silicone. The fabrication of this encapsulation layer involved two steps, firstly through… Figure 8 The lower encapsulation layer 12 is prepared using the lower encapsulation layer casting template a shown in (a). A strategy integrating the array and encapsulation layer is adopted, with the battery array placed on template a. The eight protrusions on template a correspond to the anode openings of the eight individual cells, ensuring complete embedding of the array. Silicone is then poured and cured, ensuring complete bonding between the silicone lower encapsulation layer 12 and the array without gaps, thus preventing leakage.

[0050] use Figure 8The upper encapsulation layer 11 with a liquid storage cavity is prepared using the upper encapsulation layer casting template b shown in Figure (b). The liquid storage cavity 111 is obtained by silicone casting and curing. The silicone liquid storage cavity is then bonded to the side of the lower silicone encapsulation layer to construct the entire μDMFC array. The liquid storage cavity has the same length and width as the silicone-encapsulated battery array, with a cavity thickness of 2 mm and a wall thickness of 1 mm. The complete battery array with the liquid storage cavity has a length of 6.5 cm, a width of 3 cm, and a thickness of 5 mm. Thanks to the island-bridge structure battery array design and the flexible silicone encapsulation, the entire battery array can be stretched by 10%, bent 180 degrees, and twisted arbitrarily. (See Figure 111). Figure 11 .

[0051] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A wearable micro direct methanol fuel cell flexible array, characterized in that, The flexible packaging layer (1) is provided with a circuit board (3) and a plurality of series-connected cathode plate reverse-buckling single cells (2) arranged in the flexible packaging layer (1). The cathode plate reverse-buckling single cell (2) comprises: an anode plate (21); a membrane electrode (22) arranged below the anode plate (21); a reverse-buckling cathode plate (23) arranged below the anode plate (21); an anode end plate (24) arranged above the anode plate (21); wherein the anode end plate (24) is provided with a through slot (241) in the center and a plurality of clamping grooves (242) on the upper end face; the reverse-buckling cathode plate (23) is an integral structure comprising a cathode plate body (231) and a plurality of extension arms (232) corresponding to the clamping grooves (242); the extension arms (232) extend from the outer side of the cathode plate body (231) to the clamping grooves (242) of the anode end plate (24), and the extension arms (232) wrap the anode end plate (24), the anode plate (21) and the membrane electrode (22) inside.

2. The wearable micro direct methanol fuel cell flexible array of claim 1, wherein, The lower end face of the anode end plate (24) is provided with a limiting groove (243) for accommodating the anode plate (21).

3. The wearable micro direct methanol fuel cell flexible array of claim 2, wherein, The depth of the limiting groove (243) of the anode end plate (24) is less than the thickness of the anode plate (21).

4. The wearable micro direct methanol fuel cell flexible array of claim 1, wherein, The cathode plate body (231) of the reverse-buckling cathode plate (23) and the anode plate (21) are provided with a plurality of small holes.

5. The wearable micro direct methanol fuel cell flexible array of claim 1, wherein, The circuit board (3) comprises a plurality of conductive components (31) corresponding to the number of the cathode plate reverse-buckling single cells (2); the conductive components comprise cathode conductive components (311) and anode conductive components (312); the cathode conductive components (311) are located between the reverse-buckling cathode plate (23) and the membrane electrode (22) of the cathode plate reverse-buckling single cell (2), the side of the cathode conductive component close to the reverse-buckling cathode plate (23) is made of conductive metal material, and the side close to the membrane electrode (22) is made of insulating material; the anode conductive components (312) are connected with the anode plate (21) and are made of conductive metal material.

6. The wearable micro direct methanol fuel cell flexible array of claim 5, wherein, The adjacent conductive components (31) are connected by metal wires (32), and the metal wires (32) are in the form of zigzag lines.

7. The wearable micro direct methanol fuel cell flexible array of claim 6, wherein, The metal wires (32) are in the form of zigzag lines.

8. The wearable micro direct methanol fuel cell flexible array of claim 1, wherein, The flexible packaging layer (1) comprises an upper packaging layer (11) and a lower packaging layer (12). The lower packaging layer (12) is arranged on the side of the anode end plate (24) of the cathode plate reverse-buckling single cell (2) and is provided with windows (121) corresponding to the positions of all the cathode plate reverse-buckling single cells; the window (121) corresponds to the through slot (241) in the center of the anode end plate (24) of one cathode plate reverse-buckling single cell (2). The upper packaging layer (11) is arranged above the lower packaging layer (12) and is provided with a liquid storage cavity (111) for placing methanol; the liquid storage cavity (111) wraps all the windows (121) inside.

9. The wearable micro direct methanol fuel cell flexible array of claim 1, wherein, The flexible packaging layer is made of silica gel material.

10. The wearable micro direct methanol fuel cell flexible array of claim 9, wherein, The flexible packaging layer is prepared by pouring and curing.

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