A portable power supply

Abstract

The application discloses a portable power source, which comprises a shell, an aluminum air cell arranged in the shell, the aluminum air cell comprising a cell cover and a plurality of single cells, the plurality of single cells being connected with the cell cover to form an integral whole, the shell comprising a bottom shell, the plurality of single cells being arranged in the bottom shell, the cell cover being sealingly arranged at an open end of the bottom shell to enclose the single cells in the bottom shell, an openable and closable air inlet structure being arranged on the bottom shell, the air inlet structure being used for providing air into the bottom shell when the air inlet structure is opened and preventing air from entering the bottom shell when the air inlet structure is closed, and an air outlet device being arranged on the cell cover, the air outlet device being used for drawing out the air in the bottom shell when the air inlet structure is closed. The portable power source provided by the application can control whether air enters the shell through the arrangement of the air outlet device and the air inlet structure, so that the aluminum air cell can stop working due to insufficient oxygen supply in the power generation air idle state, and the problems of shortening of the power generation time of the aluminum air cell and low utilization rate of the aluminum plate caused by self-corrosion of the aluminum air cell in the air idle state after starting are solved.

Description

Technical Field

[0001] This invention relates to the field of aluminum-air battery technology, and more specifically, to a portable power source. Background Technology

[0002] In existing aluminum-air batteries, after adding electrolyte, the aluminum plates are constantly immersed in the electrolyte and in continuous contact with air, resulting in significant self-corrosion under no-load conditions after startup. This high self-corrosion under no-load conditions directly leads to the ineffective consumption of aluminum plates, significantly reducing their effective utilization rate. Consequently, the actual power generation time of the aluminum-air battery is significantly shortened, failing to fully utilize its high specific energy advantage. This also increases the operating cost of aluminum-air batteries, limiting their application in scenarios with high requirements for range and efficiency. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the present invention innovatively provides a portable power source that can solve the technical problems of large self-corrosion and low aluminum plate utilization in the prior art aluminum-air batteries.

[0004] To achieve the aforementioned technical objectives, this invention discloses a portable power supply, comprising a housing, within which an aluminum hollow fuel cell stack is disposed. The aluminum hollow fuel cell stack includes a stack cover and individual units, wherein multiple individual units are disposed, and the multiple individual units are connected to the stack cover to form an integral unit. The outer casing includes a bottom shell, with a plurality of the individual units disposed within the bottom shell. The fuel cell stack cover is sealed at the opening of the bottom shell, enclosing the individual units within the bottom shell. The bottom shell is provided with an openable and closable air intake structure. When the air intake structure is open, it supplies air into the bottom shell; when the air intake structure is closed, it prevents air from entering the bottom shell. An exhaust device is provided on the fuel cell stack cover, which is used to extract air from the bottom shell when the air intake structure is closed.

[0005] Furthermore, a lithium battery module is also provided on the battery stack cover. The lithium battery module is electrically connected to the aluminum hollow battery stack, and the aluminum hollow battery stack can be used to charge the lithium battery module. The output port of the lithium battery module is connected in parallel with the output port of the aluminum air stack.

[0006] Furthermore, the air intake structure includes an air intake hole and a sealing plate formed on the side wall of the bottom shell. The air inlet is a through hole communicating with the interior of the bottom shell, and multiple inlets are distributed on the side wall of the bottom shell. The sealing plate is a flexible plate and is disposed on the outer wall of the bottom shell. When the sealing plate is unfolded, it can cover the area where the air inlet is located and block all the air inlets. When the sealing plate is retracted, the air inlets are open.

[0007] Furthermore, the fuel cell stack cover is provided with a first vent hole, which communicates with the inner cavity of the bottom shell. A vacuum pump is installed on the fuel cell stack cover. The vacuum pump is connected to the first exhaust port and is used to extract air from the bottom shell.

[0008] Furthermore, the battery stack cover is a plate-shaped structure, and a plurality of rectangular annular grooves are formed on the first surface of the battery stack cover. Each rectangular annular groove corresponds to one of the individual units. A first sealing structure is provided in the rectangular annular groove. An annular protrusion is provided on the upper end surface of the individual unit along its edge. The annular protrusion is embedded in the rectangular annular groove and makes sealing contact with the first sealing structure.

[0009] Furthermore, the fuel cell stack cover is provided with a plurality of second vent holes, each of which is located inside one of the rectangular annular grooves and communicates with the outlet of one of the individual cells. The fuel cell stack cover is provided with a third vent, which communicates with the inner cavity of the bottom shell. The fuel cell stack cover is provided with a conduit, which is located on a second surface of the fuel cell stack cover that is parallel to the first surface. The conduit is connected to each of the exhaust holes and the third exhaust hole.

[0010] Furthermore, each of the individual units has a retaining plate formed on two side walls, and the retaining plates on multiple individual units are located at the same height on the individual units. The two sides of the stack cover are provided with hooks, which engage with the locking plates. Each hook engages with the locking plates on at least two of the individual units.

[0011] Furthermore, a sealing groove is provided circumferentially on the first surface of the fuel cell stack cover, and a second sealing structure is provided in the sealing groove. The edge of the bottom shell is embedded in the sealing groove and makes sealing contact with the second sealing structure.

[0012] Furthermore, the outer casing also includes a top cover, which is fastened to the second surface of the fuel cell stack cover and in sealing contact with the fuel cell stack cover, and the top cover is connected to the bottom shell.

[0013] Furthermore, a locking hook is provided on the outer wall of the upper cover, and a locking buckle is provided on the outer wall of the bottom shell, with the locking buckle connected to the locking hook.

[0014] The beneficial effects of this invention are as follows: The portable power supply provided by this invention can control whether air enters the casing by setting an exhaust device and an air intake structure, so that the aluminum air battery can stop working due to insufficient oxygen supply when it is in the no-load state of power generation. This solves the problem of shortened power generation time and low aluminum plate utilization caused by large self-corrosion in the no-load state after startup. Attached Figure Description

[0015] Figure 1 A schematic diagram of the structure of a portable power supply according to an embodiment of the present invention is shown; Figure 2 This diagram illustrates the structure of an aluminum air stack according to an embodiment of the present invention. Figure 3 A top view schematic diagram of an aluminum air stack according to an embodiment of the present invention is shown; Figure 4 Show Figure 3 Schematic diagram of cross-section at point AA; Figure 5 A side view schematic diagram of a portable power supply according to an embodiment of the present invention is shown; Figure 6 Show Figure 5 Schematic diagram of cross-section at point BB; Figure 7 Show Figure 6 Enlarged view of point A in the middle; Figure 8 This is a side view of a portable power supply according to an embodiment of the present invention (with the sealing plate retracted). Figure 9 A top view of a portable power supply according to an embodiment of the present invention is shown (with the top cover removed).

[0016] In the picture, 1. Outer shell; 11. Bottom shell; 111. Air inlet; 12. Top cover; 13. Sealing plate; 14. Lock; 15. Handle; 16. Switch; 17. Output port; 2. Aluminum air stack; 21. Stack cover; 211. First vent; 212. Second vent; 213. Third vent; 214. Connecting post; 215. Hook; 216. Rectangular annular groove; 217. Sealing groove; 22. Unit; 221. Clamping plate; 23. Vacuum pump; 24. Conduit; 3. Lithium battery module; 4. DC-DC converter. Detailed Implementation

[0017] The portable power supply provided by the present invention will be explained and described in detail below with reference to the accompanying drawings.

[0018] The portable power supply provided by this invention can control whether air enters the casing by setting up an exhaust device and an air intake structure. This allows the aluminum-air battery to stop working due to insufficient oxygen supply when in a no-load power generation state, solving the problem of shortened power generation time and low aluminum plate utilization caused by excessive self-corrosion in the no-load state after startup. The invention will be described in detail below with reference to specific embodiments: This invention provides a portable power supply, such as Figure 1 , Figure 2 As shown, it includes a housing 1, and an aluminum-air battery stack 2 is disposed inside the housing 1. The air inside the housing 1 is used to provide oxygen for the reaction of the aluminum-air battery stack 2. In this embodiment, the air content inside the housing 1 can be controlled, thereby controlling the start and stop of the aluminum-air battery, achieving the effect of reducing the self-corrosion of the aluminum-air battery stack 2, improving the utilization rate of aluminum plates and extending the power generation life.

[0019] In some embodiments, such as Figure 2 As shown, the aluminum air fuel cell stack 2 includes a stack cover 21 and multiple individual units 22, which are connected to the stack cover 21 as a whole. The outer shell 1 includes a bottom shell 11, and multiple individual units 22 are disposed inside the bottom shell 11. The stack cover 21 is sealed at the opening end of the bottom shell 11, enclosing the individual units 22 inside the bottom shell 11. The bottom shell 11 is provided with an openable and closable air intake structure, which supplies air into the bottom shell 11 when the air intake structure is open and prevents air from entering the bottom shell 11 when the air intake structure is closed. The stack cover 21 is provided with an exhaust device, which is used to extract air from the bottom shell 11 when the air intake structure is closed.

[0020] In some embodiments, such as Figure 2 , Figure 3 , Figure 4 As shown, the fuel cell stack cover 21 has a plate-like structure, for example, a roughly flat plate structure. The first surface of the fuel cell stack cover 21 is flat, and multiple rectangular annular grooves 216 are formed on the first surface of the fuel cell stack cover 21. The rectangular annular grooves 216 have the same end shape as the individual units 22. Each rectangular annular groove 216 corresponds to one individual unit 22, and the multiple rectangular annular grooves 216 are arranged in a row and evenly spaced. In this embodiment, six individual units 22 are provided, and correspondingly, six rectangular annular grooves 216 are also provided. There is a gap between two adjacent rectangular annular grooves 216, so that after the individual units 22 and the fuel cell stack cover 21 are assembled, a gap is formed between two adjacent individual units 22, so that air can smoothly enter into each individual unit 22 and provide sufficient oxygen to the individual unit 22.

[0021] A first sealing structure, which is a sealing ring, is provided within the rectangular annular groove 216. An annular protrusion is provided along the edge of the upper end face of the unit 22. The annular protrusion is embedded in the rectangular annular groove 216 and makes sealing contact with the first sealing structure. The annular protrusion and the rectangular annular groove 216 cooperate to form an installation positioning and seal, making the installation of the unit 22 more convenient and reliable. In some embodiments, the fuel cell stack cover 21 is provided with a plurality of second vent holes 212. Each second vent hole 212 is located inside a rectangular annular groove 216 and communicates with the outlet of a unit 22. Gases discharged from the reaction of the unit 22 are discharged through the second vent holes 212. The fuel cell stack cover 21 is provided with a third vent hole 213, which communicates with the inner cavity of the bottom shell 11. A conduit 24 is provided on the fuel cell stack cover 21, located on a second surface of the fuel cell stack cover 21 parallel to the first surface. The conduit 24 communicates with each vent hole and the third vent hole 213. For example, multiple second vent holes 212 are located on the same straight line, and two third vent holes 213 are provided. The two third vent holes 213 and the multiple second vent holes 212 are on the same straight line. The conduit 24 is a straight pipe with elbows at both ends, which connect to the two third vent holes 213. Multiple connecting pipes are provided on the conduit 24, each connecting pipe connecting to one of the second vent holes 212. The gas generated by the reaction of monomer 22 is discharged from the second vent holes 212 and collected in the conduit 24. The gas is then introduced into the bottom shell 11 through the conduit 24 to prevent the gas from corroding the electrical components on the fuel cell stack cover 21. In other embodiments, the conduit 24 can lead the gas to the outside of the shell, so that the gas from the reaction of monomer 22 does not come into contact with the electrical components inside the shell.

[0022] In some embodiments, such as Figure 2 , Figure 4As shown, each unit 22 has a locking plate 221 formed on both side walls. The locking plates 221 on multiple units 22 are located at the same height. Hooks 215 are provided on both sides of the fuel cell stack cover 21, engaging with the locking plates 221. Each hook 215 engages with at least two locking plates 221 on each unit 22. For example, the width of the hook 215 is greater than the width of the locking plate 221, allowing one hook 215 to engage with two locking plates 221. Specifically, three hooks 215 are provided on each side of the fuel cell stack cover 21, each engaging with two locking plates 221 on two units 22, which improves the assembly efficiency of the units 22 and the fuel cell stack cover 21. Exemplarily, two locking plates 221 are symmetrically arranged on the two side walls of the unit 22, perpendicular to the side walls of the unit 22, with locking grooves formed on the lower side of the locking plates 221. The hook 215 is rotatably mounted on the first surface of the fuel cell stack cover 21 via a pivot. By flipping it, it can engage with the locking plate 221, pressing the end of the unit 22 into the rectangular annular groove 216 on the fuel cell stack cover 21. The hook 215 is provided with a locking strip, which cooperates with the locking groove on the locking plate 221. When the hook 215 engages with the locking plate 221, the locking strip is embedded in the locking groove, which can prevent the hook 215 from disengaging from the locking plate 221 and ensure a reliable connection between the unit 22 and the fuel cell stack cover 21.

[0023] In some embodiments, such as Figure 9 As shown, a lithium battery module 3, a DC-DC converter 4, and a matching control unit are arranged on the second surface of the battery stack cover 21. The DC-DC converter 4 connects the lithium battery module 3 and the aluminum-air stack 2, undertaking the core functions of power conversion, voltage regulation, and charge / discharge control. The lithium battery module 3 is electrically connected to the aluminum-air stack 2, and the aluminum-air stack 2 can be used to charge the lithium battery module 3. The output port of the lithium battery module 3 is connected in parallel with the output port of the aluminum-air stack 2, allowing the lithium battery module 3 and the aluminum-air stack 2 to supply power independently, or the lithium battery module 3 to be charged through the aluminum-air stack 2. When short-term power supply or overload power supply is required, power can be supplied through the lithium battery module 3. When the lithium battery module 3 is about to run out in extreme cases, the aluminum-air stack 2 is activated, which can solve the problems of slow start-up speed and poor overload capacity of the aluminum-air stack 2.

[0024] In this embodiment, the DC-DC converter 4 can automatically switch its operating mode according to the system's power supply requirements, precisely processing the output power. When the aluminum-air fuel cell stack 2 is working normally, the DC-DC converter 4 regulates and rectifies the power output from the aluminum-air fuel cell stack 2. On the one hand, it can directly output power that meets the load requirements; on the other hand, it can automatically adjust the charging current and voltage according to the remaining charge of the lithium battery module 3, providing constant current and constant voltage charging for the lithium battery module 3. This ensures that the lithium battery module 3 is always maintained within a reasonable charge range, avoiding overcharging and over-discharging that could damage the lithium battery module 3 and extending its service life. Simultaneously, the output ports of the lithium battery module 3 and the aluminum-air fuel cell stack 2 are connected in parallel through the DC-DC converter 4. Combined with the logic control of the control unit, this allows the lithium battery module 3 and the aluminum-air fuel cell stack 2 to flexibly switch power supply modes to meet the power supply needs of different scenarios.

[0025] In some embodiments, such as Figure 5 , Figure 6 , Figure 7 As shown, a sealing groove 217 is provided circumferentially on the first surface of the fuel cell stack cover 21. Multiple rectangular annular grooves 216 are located inside the sealing groove 217. A second sealing structure is provided inside the sealing groove 217. The edge of the bottom shell 11 is embedded in the sealing groove 217 and makes sealing contact with the second sealing structure. The second sealing structure is a sealing ring, which forms a sealing contact between the fuel cell stack cover 21 and the bottom shell 11 to prevent air leakage.

[0026] In some embodiments, such as Figure 1 , Figure 8 As shown, the air intake structure includes an air intake hole 111 and a sealing plate 13 formed on the side wall of the bottom shell 11. The air intake hole 111 is a through hole communicating with the interior of the bottom shell 11, and multiple holes are distributed on the side wall of the bottom shell 11. The sealing plate 13 is a flexible plate and is disposed on the outer wall of the bottom shell 11. When the sealing plate 13 is unfolded, it can cover the area where the air intake hole 111 is located and block all the air intake holes 111. When the sealing plate 13 is retracted, the air intake hole 111 is open.

[0027] In this embodiment, an air inlet 111 is formed on one side wall of the bottom shell 11. The air inlets 111 are formed within a square or rectangular area and are evenly distributed in multiple locations. For example, the air inlets 111 can be arranged in an array. The size of the air inlets 111 should not be too large; they can be set as circular holes with a diameter of 3mm-5mm. Multiple small holes can ensure sufficient air intake while preventing foreign objects from entering the bottom shell 11. Optionally, an air intake structure can be provided on one side wall of the bottom shell 11, or air intake structures can be provided simultaneously on multiple side walls. For example, air intake structures can be provided simultaneously on two parallel side walls, depending on the number of individual units 22, ensuring sufficient air is provided to multiple individual units 22.

[0028] The sealing plate 13, for example, is made of silicone rubber and has an area larger than the area where the air inlets 111 are distributed. It is fixed to the side wall of the bottom shell 11 and positioned above the air inlets 111. When unfolded, it hangs naturally and fits against the side wall of the bottom shell 11, simultaneously sealing all the air inlets 111. When retracted, it can be rolled up above the air inlets 111, opening them. Optionally, Velcro can be provided on the side wall of the bottom shell 11 around the area where the air inlets 111 are distributed, and Velcro can also be provided along the edge of the sealing plate 13. The sealing plate 13 can be connected to the side wall of the bottom shell 11 using the Velcro, ensuring effective sealing of the air inlets 111.

[0029] like Figure 2 , Figure 3 As shown, the fuel cell stack cover 21 is provided with a first exhaust port 211, which communicates with the inner cavity of the bottom shell 11. A vacuum pump 23 is provided on the second surface of the fuel cell stack cover 21. The vacuum pump 23 is connected to the control unit, which supplies power and controls its start and stop. The air inlet of the vacuum pump 23 is connected to the first exhaust port 211, and the air outlet of the vacuum pump 23 is located on the outside of the outer shell 1. The vacuum pump 23 is used to extract air from the bottom shell 11. When the sealing plate 13 blocks the air inlet 111, the vacuum pump 23 starts to extract air from the bottom shell 11, creating a negative pressure inside the bottom shell 11. Thus, when the oxygen content drops below 10%, the cell 22 will stop working due to insufficient oxygen supply. The vacuum pump 23 extracts air from the bottom shell 11, reducing the air pressure inside the bottom shell 11 and creating a pressure difference between the inside and outside of the bottom shell 11. This pressure difference is used to press the sealing plate 13 tightly onto the bottom shell 11, thereby more effectively sealing the air inlet 111.

[0030] In some embodiments, the outer casing 1 further includes an upper cover 12, which is fastened to the second surface of the fuel cell stack cover 21 and in sealing contact with the fuel cell stack cover 21. The upper cover 12 is connected to the bottom shell 11, and the fuel cell stack cover 21 is pressed between the upper cover 12 and the bottom shell 11, so that the outer casing 1 and the aluminum hollow fuel cell stack 2 are integrated. Components such as the lithium battery module 3 and the DC-DC converter 4 on the fuel cell stack cover 21 are covered inside the upper cover 12, which protects these components.

[0031] In this embodiment, as Figure 1 As shown, a locking hook is provided on the outer wall of the upper cover 12, and a locking buckle 14 is provided on the outer wall of the bottom shell 11. The locking buckle 14 is connected to the locking hook. The locking buckle 14 can be connected to the locking hook by flipping, so that the upper cover 12 and the bottom shell 11 form a detachable connection. The disassembly and assembly operations can be completed quickly without the aid of tools, which is convenient for the maintenance and repair of internal components.

[0032] In some embodiments, such as Figure 2As shown, a connecting post 214 is provided on the second surface of the fuel cell stack cover 21. For example, two connecting posts 214 are provided, and the two connecting posts 214 are of the same height. When the upper cover 12 is closed onto the fuel cell stack cover 21, the top wall of the upper cover 12 contacts the top of the connecting post 214. The top of the connecting post 214 is provided with a threaded hole. Correspondingly, a through hole is provided on the top wall of the upper cover 12. Screws pass through the through hole and connect with the threaded hole, which can realize the connection between the upper cover 12 and the fuel cell stack cover 21, thereby achieving double fixation of the upper cover 12. In this embodiment, as shown... Figure 1 As shown, a handle 15 is provided on the outer side of the top wall of the top cover 12. The handle 15 can be held by personnel during movement, improving the portability of the power supply. The handle 15 can be connected independently to the top cover 12, or the handle 15 can be connected to two connecting posts 214. This allows for the simultaneous fixation of the handle 15 and the top cover 12, and can also distribute some of the force on the handle 15 to the stack cover 21, making the overall force on the equipment more even and preventing excessive force on the top cover 12.

[0033] In this embodiment, as Figure 1 As shown, a switch 16 and an output port 17 are provided on the side wall of the upper cover 12. For example, the output port 17 can be a common power supply interface such as a USB interface or a circular DC interface. The switch 16 can be used to control the operation of components such as the vacuum pump 23. Furthermore, the upper cover 12 can also be equipped with indicator lights and a touch screen, which can display and indicate the operating status and parameters of the power supply.

[0034] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0035] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0036] In the description of this specification, the references to terms such as "this embodiment," "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any at least one embodiment or example. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0038] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and simple improvements made on the substantive content of the present invention should be included within the protection scope of the present invention.

Claims

1. A portable power supply, characterized in that, The system includes an outer casing, within which an aluminum air-filled fuel cell stack is disposed. The aluminum air-filled fuel cell stack includes a stack cover and individual units. Multiple individual units are disposed and connected to the stack cover to form a single unit. The outer casing includes a bottom shell, with a plurality of the individual units disposed within the bottom shell. The fuel cell stack cover is sealed at the opening of the bottom shell, enclosing the individual units within the bottom shell. The bottom shell is provided with an openable and closable air intake structure. When the air intake structure is open, it supplies air into the bottom shell; when the air intake structure is closed, it prevents air from entering the bottom shell. An exhaust device is provided on the fuel cell stack cover, which is used to extract air from the bottom shell when the air intake structure is closed.

2. The portable power supply according to claim 1, characterized in that, The battery stack cover is also equipped with a lithium battery module, which is electrically connected to the aluminum-air battery stack. The aluminum-air battery stack can be used to charge the lithium battery module. The output port of the lithium battery module is connected in parallel with the output port of the aluminum air stack.

3. The portable power supply according to claim 1, characterized in that, The air intake structure includes an air intake hole and a sealing plate formed on the side wall of the bottom shell. The air inlet is a through hole communicating with the interior of the bottom shell, and multiple inlets are distributed on the side wall of the bottom shell. The sealing plate is a flexible plate and is disposed on the outer wall of the bottom shell. When the sealing plate is unfolded, it can cover the area where the air inlet is located and block all the air inlets. When the sealing plate is retracted, the air inlets are open.

4. The portable power supply according to claim 3, characterized in that, The fuel cell stack cover is provided with a first vent hole, which communicates with the inner cavity of the bottom shell. A vacuum pump is installed on the fuel cell stack cover. The vacuum pump is connected to the first exhaust port and is used to extract air from the bottom shell.

5. The portable power supply according to claim 1, characterized in that, The battery stack cover is a plate-shaped structure, and multiple rectangular annular grooves are formed on the first surface of the battery stack cover. Each rectangular annular groove corresponds to one of the individual units. A first sealing structure is provided in the rectangular annular groove. An annular protrusion is provided on the upper end surface of the individual unit along its edge. The annular protrusion is embedded in the rectangular annular groove and makes sealing contact with the first sealing structure.

6. The portable power supply according to claim 5, characterized in that, The fuel cell stack cover is provided with a plurality of second vent holes, each of which is located inside one of the rectangular annular grooves and communicates with the outlet of one of the individual cells. The fuel cell stack cover is provided with a third vent, which communicates with the inner cavity of the bottom shell. The fuel cell stack cover is provided with a conduit, which is located on a second surface of the fuel cell stack cover that is parallel to the first surface. The conduit is connected to each of the exhaust holes and the third exhaust hole.

7. The portable power supply according to claim 6, characterized in that, Each of the aforementioned monomers has a retaining plate formed on two side walls, and the retaining plates on multiple monomers are located at the same height on the monomers. The two sides of the stack cover are provided with hooks, which engage with the locking plates. Each hook engages with the locking plates on at least two of the individual units.

8. The portable power supply according to claim 5, characterized in that, A sealing groove is provided circumferentially on the first surface of the fuel cell stack cover, and a second sealing structure is provided in the sealing groove. The edge of the bottom shell is embedded in the sealing groove and makes sealing contact with the second sealing structure.

9. The portable power supply according to claim 5, characterized in that, The outer casing also includes a top cover, which is fastened to the second surface of the fuel cell stack cover and in sealed contact with the fuel cell stack cover. The top cover is connected to the bottom shell.

10. The portable power supply according to claim 9, characterized in that, A locking hook is provided on the outer wall of the upper cover, and a locking buckle is provided on the outer wall of the bottom shell. The locking buckle is connected to the locking hook.

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