Alkaline seawater high-power metal-air battery cell and preparation method and application thereof

Abstract

The application discloses a kind of alkaline seawater high-power metal air battery monomer and preparation method and application thereof, belong to battery monomer technical field, including plate reaction frame, electrode sheet, top cover, metal conductive contact piece, outer cover and fastener.Two groups of cross-shaped cross support ribs are symmetrically arranged on the plate reaction frame, and each group of cross-shaped cross support ribs forms four open reaction windows arranged in two rows and two columns;A piece of electrode sheet is inserted into the electrode receiving groove, and the effective reaction area thereof respectively spans four open reaction windows.Electrolyte liquid inlet and outlet are arranged on the opposite side of the plate reaction frame and are staggered in height, and are communicated with the upper gas-liquid buffer space.The conductive lead-out part, metal conductive contact piece and top cover are press-connected and fixed by the fastener.The application coordinates the reaction area, cross-window liquid supply, upper exhaust, insertion positioning and conductive press connection within the same thin monomer boundary, and is suitable for alkaline seawater electrolyte and high-power power supply for marine equipment.

Description

Technical Field

[0001] This invention relates to the field of battery cell technology, and in particular to an alkaline seawater high-power metal-air battery cell, its preparation method, and its application. Background Technology

[0002] Seawater metal-air batteries use metal as the anode active material, oxygen from the air as the cathode reactant, and natural seawater or regulated seawater systems as the ion conduction medium. They have the advantages of wide availability of raw materials, good safety, and suitability for marine environments.

[0003] When supplying high-current power to marine equipment, individual battery cells need to simultaneously address issues related to reaction area, liquid phase mass transfer, bubble removal, electrode positioning, and conductive contact. Excessive frame support structures can obstruct the effective reaction area; improper liquid inlet / outlet positions or flow space settings can cause localized insufficient liquid supply; trapped bubbles can occupy the effective interface; and electrode misalignment and uneven pressing can lead to window misalignment and contact resistance fluctuations.

[0004] Existing metal-air batteries have disclosed multi-chamber, plate slot, electrolyte circulation and venting structures. However, the above structures usually solve the problems of electrolyte supply, assembly or venting separately. There is still a need for a single-unit structure suitable for thin, large-area electrode sheets, so that an electrode sheet spans multiple open windows and forms a synergistic relationship of cross-window flow, upper gas-liquid buffer, insertion limit and top conductive voltage connection within the same frame boundary. Summary of the Invention

[0005] The purpose of this invention is to provide a high-power metal-air battery cell for alkaline seawater, its preparation method and application, to improve the effective area utilization of large-area electrode sheets, and to improve the stability of cross-window liquid supply, bubble floating and discharge, assembly positioning and conductive contact.

[0006] To achieve the above objectives, the present invention provides a high-power metal-air battery cell for alkaline seawater, comprising a plate-shaped reaction frame, electrode sheets, a top cover, metal conductive contact sheets, an outer cover, and fasteners; Two sets of cross-shaped cross-bracing ribs are symmetrically arranged on the plate-shaped reaction frame. Each set of cross-shaped cross-bracing ribs forms four open reaction windows arranged in two rows and two columns. Adjacent open reaction windows are separated by cross-shaped cross-bracing ribs. An electrode receiving groove is provided on the inner side of the plate-shaped reaction frame, and the electrode receiving groove is located between two sets of cross-shaped cross-support ribs. One electrode sheet is inserted into the electrode receiving groove, and the same effective reaction area of ​​the electrode sheet spans and corresponds to the four open reaction windows of each set of cross-shaped cross-support ribs. The plate-shaped reaction frame has an electrolyte inlet on its left side and an electrolyte outlet on its right side, which is opposite to the left side. The electrolyte inlet is lower than the electrolyte outlet. The electrode sheet is provided with a conductive lead-out portion at its top, which extends from the upper part of the plate-shaped reaction frame. The top cover closes the upper opening of the electrode receiving groove. The fasteners are distributed along the top cover and press and fix the top cover, the metal conductive contact sheet and the conductive lead-out portion. The bottom of the top cover is provided with an upper gas-liquid buffer space, the cross-shaped cross support ribs are provided with channels, the plate-shaped reaction frame is provided with flow channels, the flow channels on the plate-shaped reaction frame surround the four open reaction windows, and the electrolyte inlet, the flow channels on the plate-shaped reaction frame and the channels on the cross-shaped cross support ribs, the upper gas-liquid buffer space and the electrolyte outlet are connected in sequence. Fasteners secure the two outer caps to both sides of the plate-shaped reaction frame.

[0007] Preferably, the electrolyte flowing in from the electrolyte inlet enters the flow channel on the plate-shaped reaction frame and the channels of the two sets of cross-shaped cross-support ribs. The electrolyte flows from the channel opening of the cross-shaped cross-support ribs into the four open reaction windows and contacts the electrode plates. The electrolyte flows through the upper gas-liquid buffer space and is finally output from the electrolyte outlet.

[0008] Preferably, the upper gas-liquid buffer space is located above the four open reaction windows, and the height of the upper gas-liquid buffer space is 2 mm-15 mm. The electrolyte outlet is connected to the upper gas-liquid buffer space so that the air bubbles entering the upper gas-liquid buffer space are discharged with the circulating electrolyte.

[0009] Preferably, the fastener includes a fastening bolt and a fastening nut, and a groove is provided on the top left side of the plate-shaped reaction frame; the metal conductive contact piece is located in the groove, and the top of the metal conductive contact piece penetrates through the top cover; the fastening bolt passes through the two outer covers, the plate-shaped reaction frame, and the metal conductive contact piece from the side and is connected by the fastening nut; the two outer covers are located on both sides of the plate-shaped reaction frame, which serves to close the plate-shaped reaction frame.

[0010] Preferably, the battery cell is a dedicated structure adapted to work with alkaline seawater electrolyte; the alkaline seawater electrolyte is prepared by adding an alkaline regulator to natural seawater, with a pH value of 10.5~14.0, and the alkaline regulator is one or more of sodium hydroxide, potassium hydroxide, sodium carbonate, and potassium carbonate; the height of the upper gas-liquid buffer space is adapted to the gas evolution rate of the alkaline seawater electrolyte system, and is used to discharge the bubbles generated by the reaction with the circulating electrolyte.

[0011] Preferably, the plate-shaped reaction frame is integrally formed by 3D printing or machining, and the material of the plate-shaped reaction frame is an alkali-resistant polymer material; the cross-shaped cross support ribs include intersecting transverse support ribs and longitudinal support ribs, the total opening area of ​​the four open reaction windows accounts for 60%-90% of the orthographic projection area of ​​the plate-shaped reaction frame, and the width of the transverse support ribs and the longitudinal support ribs are 2 mm-10 mm respectively.

[0012] A method for preparing a high-power metal-air battery cell in alkaline seawater includes the following steps: S1: Prepare a plate-shaped reaction frame according to the size of the electrode sheet, and form four open reaction windows arranged in two rows and two columns, cross-shaped cross support ribs, electrolyte inlet and electrolyte outlet ports arranged opposite to each other and staggered at height, and a gas-liquid buffer space located above the four open reaction windows. S2: Insert an electrode sheet along the electrode receiving groove so that the same effective reaction area of ​​the electrode sheet spans and corresponds to the four open reaction windows, and the electrode sheet is located between two sets of cross-shaped cross support ribs. S3: Make the conductive lead-out part of the electrode plate extend from the top of the top cover, place the metal conductive contact plate in the groove, and fix it by pressing with fastening bolts and fastening nuts distributed along the top cover. S4: Connect the electrolyte inlet to the circulating supply end and the electrolyte outlet to the return end, so that the alkaline seawater electrolyte enters the flow channel on the plate-shaped reaction frame and the channel of the two sets of cross-shaped cross support ribs from the low electrolyte inlet, and flows out through the channel opening, flows through the reaction area corresponding to the four open reaction windows, and then is discharged through the upper gas-liquid buffer space and the high electrolyte outlet.

[0013] Preferably, in step S4, the circulation flow rate of the alkaline seawater electrolyte is 5 mL / min to 200 mL / min.

[0014] Preferably, an alkaline seawater high-power metal-air battery cell is used in marine equipment power supply, battery module construction, or high-power seawater metal-air power supply.

[0015] The advantages and positive effects of the alkaline seawater high-power metal-air battery cell described in this invention are as follows: 1. The cross-shaped cross-bracing divides the area into four open reaction windows, ensuring that the left and right sides of an electrode sheet are in contact with the four open reaction windows while maintaining in-plane support, thus reducing the obstruction of the effective reaction area by the frame.

[0016] 2. The relative side-staggered high-inlet and high-outlet liquid and the common electrolyte flow space are coordinated so that the electrolyte enters from the low position, crosses the corresponding reaction zones of the four windows and is discharged from the high position, which helps to reduce the stagnant area.

[0017] 3. The upper gas-liquid buffer space located above the open reaction window provides space for the rising bubbles to leave the reaction zone and is connected to the high-level liquid outlet.

[0018] 4. Fasteners are fixed to the plate-shaped reaction frame by metal conductive contact pieces, and the conductive lead-out part is pressed in place by the top cover by fasteners, forming a stable conductive contact while completing the closed assembly.

[0019] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of a high-power metal-air battery cell for alkaline seawater according to the present invention. Figure 2 This is a schematic diagram showing the connection between the plate-shaped reaction frame and the top cover of the present invention; Figure 3 This is a schematic diagram of the channel on the cross-shaped cross support rib of the present invention; Figure 4 for Figure 1 Exploded view; Figure 5 This is a schematic diagram of the structure of the present invention, showing the electrode sheet inserted between the plate-shaped reaction frame and two sets of cross-shaped cross support ribs; Figure 6 for Figure 5 Another perspective illustration; Figure 7 The peak power diagrams are the converted original records of the eight sets of research and development samples of this invention. Figure 8 This is a graph showing the electropolarization curves of the eight research samples of this invention.

[0021] Figure label: 1. Plate-shaped reaction frame; 2. Open reaction window; 3. Cross-shaped cross support ribs; 4. Groove; 5. Electrode plate; 6. Conductive lead-out part; 7. Metal conductive contact plate; 8. Top cover; 9. Electrolyte inlet port; 10. Electrolyte outlet port; 11. Upper gas-liquid buffer space; 13. Fastening bolt; 14. Fastening nut; 15. Outer cover; 16. Channel opening. Detailed Implementation

[0022] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. These terms are used only for the convenience of describing the invention and for simplifying the description, and do not 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 the invention. In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] In this application, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. In case of any inconsistency, the meaning set forth in this specification or derived from the content described herein shall prevail. Furthermore, the terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit the scope of this application.

[0024] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0025] like Figures 1-8 As shown, an alkaline seawater high-power metal-air battery cell includes a plate-shaped reaction frame 1, electrode sheets 5, a top cover, a metal conductive contact sheet 7, an outer cover 15, and fasteners.

[0026] Two sets of cross-shaped cross-bracing ribs 3 are symmetrically arranged on the plate-shaped reaction frame 1. Each set of cross-shaped cross-bracing ribs 3 forms four open reaction windows 2 arranged in two rows and two columns. Adjacent open reaction windows 2 are separated by cross-shaped cross-bracing ribs 3.

[0027] An electrode receiving groove is provided on the inner side of the plate-shaped reaction frame 1, and the electrode receiving groove is located between two sets of cross-shaped cross-support ribs 3. An electrode plate 5 is inserted into the electrode receiving groove, and the same effective reaction area of ​​the electrode plate 5 spans and corresponds to the four open reaction windows of each set of cross-shaped cross-support ribs 3.

[0028] The plate-shaped reaction frame 1 has an electrolyte inlet 9 on its left side and an electrolyte outlet 10 on its right side, which is opposite to the left side. The electrolyte inlet 9 is lower than the electrolyte outlet 10.

[0029] The top of the electrode sheet 5 is provided with a conductive lead-out part 6, which extends from the upper part of the plate-shaped reaction frame 1. The top cover closes the upper opening of the electrode receiving groove. Fasteners are distributed along the top cover and press and fix the top cover, the metal conductive contact sheet 7 and the conductive lead-out part 6.

[0030] The bottom of the top cover 8 is provided with an upper gas-liquid buffer space 11, the cross-shaped cross support rib 3 is provided with a channel, the plate-shaped reaction frame 1 is provided with a flow channel, the flow channel on the plate-shaped reaction frame 1 surrounds the four open reaction windows 2, and the electrolyte inlet 9, the flow channel on the plate-shaped reaction frame 1 and the channel on the cross-shaped cross support rib 3, the upper gas-liquid buffer space 11 and the electrolyte outlet 10 are connected in sequence.

[0031] Fasteners secure the two outer caps 15 to both sides of the plate-shaped reaction frame 1.

[0032] Electrolyte flowing in from electrolyte inlet 9 enters the flow channel on the plate-shaped reaction frame 1 and the channels of the two sets of cross-shaped cross support ribs 3. Electrolyte flows from the channel opening 16 of the cross-shaped cross support ribs 3 into the four open reaction windows 2 to contact the electrode plates 5. Electrolyte flows through the upper gas-liquid buffer space 11 and is finally output from electrolyte outlet 10.

[0033] The upper gas-liquid buffer space 11 is located above the four open reaction windows 2. The height of the upper gas-liquid buffer space 11 is 2 mm-15 mm. The electrolyte outlet 10 is connected to the upper gas-liquid buffer space 11 so that the bubbles entering the upper gas-liquid buffer space 11 are discharged with the circulating electrolyte.

[0034] The fasteners include a fastening bolt 13 and a fastening nut 14. A groove 4 is provided on the top left side of the plate-shaped reaction frame 1. A metal conductive contact piece 7 is located in the groove 4, and the top of the metal conductive contact piece 7 penetrates through the top cover 8. The fastening bolt 13 passes through the two outer covers 15, the plate-shaped reaction frame 1, and the metal conductive contact piece 7 from the side and is then connected by the fastening nut 14. The two outer covers 15 are located on both sides of the plate-shaped reaction frame 1, serving to seal the plate-shaped reaction frame 1.

[0035] The battery cell has a specialized structure adapted to operate with alkaline seawater electrolyte. The alkaline seawater electrolyte is prepared by adding an alkaline regulator to natural seawater, with a pH value of 10.5~14.0. The alkaline regulator is one or more of sodium hydroxide, potassium hydroxide, sodium carbonate, and potassium carbonate. The height of the upper gas-liquid buffer space is adapted to the gas evolution rate of this alkaline seawater electrolyte system, and is used to discharge the bubbles generated by the reaction with the circulating electrolyte.

[0036] The plate-shaped reaction frame 1 is integrally formed by 3D printing or machining, and the material of the plate-shaped reaction frame 1 is an alkali-resistant polymer material. The cross-shaped intersecting support ribs 3 include intersecting transverse support ribs and longitudinal support ribs. The total opening area of ​​the four open reaction windows 2 accounts for 60%-90% of the orthographic projection area of ​​the plate-shaped reaction frame 1, and the width of the transverse support ribs and longitudinal support ribs are 2 mm-10 mm, respectively.

[0037] This invention discloses a method for preparing a high-power metal-air battery cell in alkaline seawater, comprising the following steps: S1: Prepare a plate-shaped reaction frame 1 according to the size of the electrode sheet 5. Form four open reaction windows 2 arranged in two rows and two columns, cross-shaped cross support ribs 3, electrolyte inlet ports 9 and electrolyte outlet ports 10 arranged opposite each other and staggered in height, and a gas-liquid buffer space located above the four open reaction windows 2 on the plate-shaped reaction frame 1.

[0038] S2: Insert an electrode sheet 5 along the electrode receiving groove so that the same effective reaction area of ​​the electrode sheet 5 spans and corresponds to four open reaction windows 2, and the electrode sheet 5 is located between two sets of cross-shaped cross support ribs 3.

[0039] S3: The conductive lead-out part 6 of the electrode plate 5 extends out from the top of the top cover 8, the metal conductive contact piece 7 is placed in the groove 4, and it is fixed by pressing and fastening the fastening bolts 13 and fastening nuts 14 distributed along the top cover.

[0040] S4: Connect the electrolyte inlet 9 to the circulation supply end and the electrolyte outlet 10 to the return end, so that the alkaline seawater electrolyte enters the flow channel on the plate-shaped reaction frame 1 and the channel of the two sets of cross-shaped cross support ribs 3 from the low electrolyte inlet 9, and flows out through the channel port 16, flows through the reaction area corresponding to the four open reaction windows 2, and then is discharged through the upper gas-liquid buffer space 11 and the high electrolyte outlet 10.

[0041] In step S4, the circulation flow rate of the alkaline seawater electrolyte is 5 mL / min to 200 mL / min.

[0042] Specifically, the four open reaction windows 2 share a single electrode plate 5, avoiding the positioning errors and increased contact points caused by installing multiple small electrode plates separately.

[0043] Specifically, the plate-shaped reaction frame 1 has flow channels inside, such as... Figure 3 As shown.

[0044] To verify that the structural design can be implemented in a real cell, seven comparative examples were used for comparison with Example 1, which uses the cell of this battery.

[0045] Among them, Comparative Example 1 uses pure seawater with a pH value typically between 7.5 and 8.5. The frame has a large open window inside, without an upper gas-liquid buffer space, and the inlet and outlet interfaces are located on the same side.

[0046] Comparative Example 2 uses the alkaline seawater electrolyte of this embodiment, with a pH value of 10.5~14.0, a large open window, no upper gas-liquid buffer space, and the inlet and outlet interfaces are located on opposite sides.

[0047] Comparative Example 3 uses the alkaline seawater electrolyte of this embodiment, with a pH value of 10.5~14.0, two large open windows, no upper gas-liquid buffer space, and the inlet and outlet interfaces are located on opposite sides.

[0048] Comparative Example 4 uses the alkaline seawater electrolyte of this embodiment, with a pH value of 10.5~14.0. It has only one set of cross-shaped cross-support ribs, forming four open reaction windows. There are channels inside the cross-shaped cross-support ribs, but no upper gas-liquid buffer space. The inlet and outlet interfaces are located on the same side.

[0049] Comparative Example 5 uses the alkaline seawater electrolyte of this embodiment, with a pH value of 10.5~14.0. It has only one set of cross-shaped cross-support ribs, forming four open reaction windows. There are channels inside the cross-shaped cross-support ribs, and there is an upper gas-liquid buffer space. The inlet and outlet interfaces are located on opposite sides of the structure, but the height of the inlet and outlet interfaces is the same.

[0050] Comparative Example 6 uses the alkaline seawater electrolyte of this embodiment, with a pH value of 10.5~14.0. It has only one set of cross-shaped cross-support ribs, forming four open reaction windows. The cross-shaped cross-support ribs have channels and an upper gas-liquid buffer space. The inlet and outlet interfaces are located on the same side.

[0051] Comparative Example 7 uses the alkaline seawater electrolyte of this embodiment, with a pH value of 10.5~14.0. It has only one set of cross-shaped cross-support ribs, forming four open reaction windows. There are channels inside the cross-shaped cross-support ribs, and there is an upper gas-liquid buffer space. The inlet and outlet interfaces are located on opposite sides of the structure but at different heights.

[0052] This embodiment uses an alkaline seawater electrolyte with a pH value of 10.5~14.0. It has two sets of cross-shaped cross-supports, each of which forms four open reaction windows. The cross-shaped cross-supports have channels and an upper gas-liquid buffer space. The inlet and outlet interfaces are located on opposite sides and at different heights.

[0053] like Figure 7As shown, the peak power of Comparative Examples 1 to 7 were 0.826 W, 1.306 W, 6.700 W, 8.928 W, 9.463 W, 7.073 W, and 10.759 W, respectively, while the peak power of Example 1 was 12.859 W.

[0054] Figure 8 This diagram illustrates the current distribution of Example 1 relative to Comparative Examples 1 to 7 at different voltages. Example 1, using the same battery cell, exhibits a significantly higher current at all voltages compared to Comparative Examples 1 to 7. This result demonstrates that the technology employed in Example 1 possesses superior electrochemical kinetic performance across the entire voltage operating range. Furthermore, as the voltage increases, the current difference between Example 1 and the comparative examples shows a further widening trend. This indicates that under demanding operating conditions such as high voltage and high rate of operation, the performance advantage of Example 1 will be even more pronounced, providing strong support for its high-power output requirements in practical applications.

[0055] Specifically, multiple battery cells can be connected in series, parallel, or series-parallel to form a battery module for powering underwater robots, marine monitoring nodes, buoys, or other marine equipment.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A high-power metal-air battery cell for alkaline seawater, characterized in that: It includes a plate-shaped reaction frame, electrode plates, top cover, metal conductive contact plates, outer cover, and fasteners; Two sets of cross-shaped cross-bracing ribs are symmetrically arranged on the plate-shaped reaction frame. Each set of cross-shaped cross-bracing ribs forms four open reaction windows arranged in two rows and two columns. Adjacent open reaction windows are separated by cross-shaped cross-bracing ribs. An electrode receiving groove is provided on the inner side of the plate-shaped reaction frame, and the electrode receiving groove is located between two sets of cross-shaped cross-support ribs. One electrode sheet is inserted into the electrode receiving groove, and the same effective reaction area of ​​the electrode sheet spans and corresponds to the four open reaction windows of each set of cross-shaped cross-support ribs. The plate-shaped reaction frame has an electrolyte inlet on its left side and an electrolyte outlet on its right side, which is opposite to the left side. The electrolyte inlet is lower than the electrolyte outlet. The electrode sheet is provided with a conductive lead-out portion at its top, which extends from the upper part of the plate-shaped reaction frame. The top cover closes the upper opening of the electrode receiving groove. The fasteners are distributed along the top cover and press and fix the top cover, the metal conductive contact sheet and the conductive lead-out portion. The bottom of the top cover is provided with an upper gas-liquid buffer space, the cross-shaped cross support ribs are provided with channels, the plate-shaped reaction frame is provided with flow channels, the flow channels on the plate-shaped reaction frame surround the four open reaction windows, and the electrolyte inlet, the flow channels on the plate-shaped reaction frame and the channels on the cross-shaped cross support ribs, the upper gas-liquid buffer space and the electrolyte outlet are connected in sequence. Fasteners secure the two outer caps to both sides of the plate-shaped reaction frame.

2. The alkaline seawater high-power metal-air battery cell according to claim 1, characterized in that: The electrolyte flowing in from the electrolyte inlet enters the flow channel on the plate-shaped reaction frame and the channels of the two sets of cross-shaped cross-support ribs. The electrolyte flows from the channel opening of the cross-shaped cross-support ribs into the four open reaction windows and contacts the electrode plates. The electrolyte flows through the upper gas-liquid buffer space and is finally output from the electrolyte outlet.

3. The alkaline seawater high-power metal-air battery cell according to claim 2, characterized in that: The upper gas-liquid buffer space is located above the four open reaction windows. The height of the upper gas-liquid buffer space is 2mm-15mm. The electrolyte outlet is connected to the upper gas-liquid buffer space so that the air bubbles entering the upper gas-liquid buffer space are discharged with the circulating electrolyte.

4. The alkaline seawater high-power metal-air battery cell according to claim 3, characterized in that: The fasteners include fastening bolts and fastening nuts. A groove is provided on the top left side of the plate-shaped reaction frame. The metal conductive contact piece is located in the groove, and the top of the metal conductive contact piece penetrates through the top cover. The fastening bolt passes through the two outer covers, the plate-shaped reaction frame, and the metal conductive contact piece from the side and is connected by the fastening nut. The two outer covers are located on both sides of the plate-shaped reaction frame and serve to close the plate-shaped reaction frame.

5. The alkaline seawater high-power metal-air battery cell according to claim 4, characterized in that: The battery cell is a specially designed structure adapted to work with alkaline seawater electrolyte; the alkaline seawater electrolyte is prepared by adding an alkaline regulator to natural seawater, with a pH value of 10.5~14.0, and the alkaline regulator is one or more of sodium hydroxide, potassium hydroxide, sodium carbonate, and potassium carbonate; the height of the upper gas-liquid buffer space is adapted to the gas evolution rate of the alkaline seawater electrolyte system, and is used to discharge the bubbles generated by the reaction with the circulating electrolyte.

6. The alkaline seawater high-power metal-air battery cell according to claim 1, characterized in that: The plate-shaped reaction frame is integrally formed by 3D printing or machining, and the material of the plate-shaped reaction frame is an alkali-resistant polymer material; the cross-shaped cross support ribs include intersecting transverse support ribs and longitudinal support ribs, the total opening area of ​​the four open reaction windows accounts for 60%-90% of the orthographic projection area of ​​the plate-shaped reaction frame, and the width of the transverse support ribs and the longitudinal support ribs are 2 mm-10 mm respectively.

7. A method for preparing a high-power metal-air battery cell in alkaline seawater as described in any one of claims 1-6, characterized in that, Includes the following steps: S1: Prepare a plate-shaped reaction frame according to the size of the electrode sheet, and form four open reaction windows arranged in two rows and two columns, cross-shaped cross support ribs, electrolyte inlet and electrolyte outlet ports arranged opposite to each other and staggered at height, and a gas-liquid buffer space located above the four open reaction windows. S2: Insert an electrode sheet along the electrode receiving groove so that the same effective reaction area of ​​the electrode sheet spans and corresponds to the four open reaction windows, and the electrode sheet is located between two sets of cross-shaped cross support ribs. S3: Make the conductive lead-out part of the electrode plate extend from the top of the top cover, place the metal conductive contact plate in the groove, and fix it by pressing with fastening bolts and fastening nuts distributed along the top cover. S4: Connect the electrolyte inlet to the circulating supply end and the electrolyte outlet to the return end, so that the alkaline seawater electrolyte enters the flow channel on the plate-shaped reaction frame and the channel of the two sets of cross-shaped cross support ribs from the low electrolyte inlet, and flows out through the channel opening, flows through the reaction area corresponding to the four open reaction windows, and then is discharged through the upper gas-liquid buffer space and the high electrolyte outlet.

8. The preparation method according to claim 7, characterized in that, In step S4, the circulation flow rate of the alkaline seawater electrolyte is 5 mL / min to 200 mL / min.

9. The application of an alkaline seawater high-power metal-air battery cell as described in any one of claims 1-6 in marine equipment power supply, battery module construction, or high-power seawater metal-air power supply.

Images