Semi-open type deep sea subsurface buoy sodium borohydride fuel cell cabin

Abstract

The invention discloses a semi-open type deep sea subsurface buoy sodium borohydride fuel cell cabin which comprises a pressure-resistant shell, and a seawater desalination membrane separation device, an anode fuel raw material storage cabin, a spiral conveyor, an anode fuel dissolution reaction cabin, a direct sodium borohydride fuel cell, a cathode solution storage cabin, a waste liquid storage bag and a lithium battery are arranged in the pressure-resistant shell. The cruising ability of the deep-sea subsurface buoy is greatly improved, the operation ability boundary of the deep-sea subsurface buoy is greatly expanded, and an excellent solution thought is provided for the requirement of deep-sea long-period exploration operation of the base type subsurface buoy. Besides, the advantage of rich water resources in the marine environment is fully utilized, the sodium borohydride powder raw material with very stable physicochemical properties is carried, and seawater is continuously obtained as a solvent, so that the utilization rate of the internal space of the battery cabin is greatly improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of deep-sea measuring devices, and relates to a deep-sea buoy device, in particular to a semi-open deep-sea buoy sodium borohydride fuel cell cabin. BACKGROUND

[0002] The increasing scarcity of land resources has gradually turned people's attention to the development and utilization of marine resources. With the continuous development of modern marine technology, humans have mastered many underwater detection means. As an unattended marine observation system, the marine buoy can realize long-term, continuous and fixed-point observation in a complex underwater environment, and can accurately collect key hydrological parameters such as sea current, temperature, salinity and internal wave at different depth profiles. The system has the technical advantages of strong concealment, high stability and flexible maneuvering, and not only provides reliable data support for marine dynamics research, but also becomes an observation equipment highly praised in the field of marine scientific research due to its unique engineering characteristics.

[0003] With the evolution and development direction of deep-sea resource exploration in deep depth and long endurance, the energy supply requirements of the marine buoy system are becoming higher and higher. The working depth of the buoy system can generally reach 1000 m below, in the deep-sea environment of 4-5℃ low temperature. The current deep-sea buoy generally uses single lead-acid, zinc-silver storage battery or lithium battery for power supply. Most fuel cells use hydrogen as fuel (anode), and the reduction reaction of the oxidizing agent occurs on the cathode, realizing direct conversion of chemical energy to electrical energy. Compared with lithium batteries, lead-acid batteries and other batteries, fuel cells have the advantages of zero pollution emission, high energy conversion efficiency and super-long endurance (no charge and discharge attenuation). Direct sodium borohydride fuel cell (DBFC) realizes a revolutionary breakthrough compared with conventional fuel cells. It uses liquid sodium borohydride solution as fuel and air / oxygen / hydrogen peroxide as oxidant, effectively avoiding the safety risk and space occupation of high-pressure hydrogen storage tank, and can achieve a theoretical energy density of up to 9300 Wh / kg, providing a revolutionary power solution for long-endurance of deep-sea buoy. SUMMARY

[0004] In view of the deficiencies in the prior art, the purpose of the present application is to provide a semi-open deep-sea buoy sodium borohydride fuel cell cabin, which solves the technical problem of insufficient endurance of the single lead-acid, zinc-silver storage battery or lithium battery power supply commonly used in the prior art deep-sea buoy.

[0005] In order to solve the above technical problems, the technical scheme is adopted as follows: A semi-open deep-sea buoy sodium borohydride fuel cell cabin, comprising a pressure-resistant shell, a seawater desalination membrane separation device, an anode fuel raw material storage cabin, a spiral feeder, an anode fuel dissolution reaction cabin, a direct sodium borohydride fuel cell, a cathode solution storage cabin, a waste liquid storage bag and a lithium battery are arranged in the pressure-resistant shell.

[0006] The water outlet end of the seawater desalination membrane separation device is connected with the water inlet end of the anode fuel dissolving reaction cabin; the anode fuel raw material storage cabin stores sodium borohydride solid powder, the discharge end of the anode fuel raw material storage cabin is connected with the feeding end of the spiral feeder, and the discharge end of the spiral feeder is connected with the feeding inlet of the anode fuel dissolving reaction cabin.

[0007] The liquid outlet end of the anode fuel dissolving reaction cabin is connected with the liquid inlet end of the anode chamber of the direct sodium borohydride fuel cell, and the liquid outlet end of the cathode solution storage cabin is connected with the liquid inlet end of the cathode chamber of the direct sodium borohydride fuel cell; the liquid outlet ends of the anode chamber and the cathode chamber are both connected with the waste liquid storage bag.

[0008] The application also has the following technical features: Specifically, the water inlet end of the anode fuel dissolving reaction cabin is connected with the water outlet end of the freshwater chamber through a freshwater conveying pipeline, and a valve group II is arranged on the freshwater conveying pipeline.

[0009] Specifically, the liquid outlet end of the anode fuel dissolving reaction cabin is connected with the direct sodium borohydride fuel cell through an anode solution conveying pipeline, and a valve group III and a pump I are arranged on the anode solution conveying pipeline.

[0010] Specifically, the seawater desalination membrane separation device comprises a seawater chamber and a freshwater chamber, the water inlet end of the seawater chamber is connected with the external seawater environment, a reverse osmosis membrane is arranged in the seawater chamber, the water outlet end of the seawater chamber is connected with the water inlet end of the freshwater chamber through a water production conveying pipeline, and a valve group I and a filter are arranged on the water production conveying pipeline.

[0011] Specifically, the cathode solution storage cabin is connected with the direct sodium borohydride fuel cell through a cathode solution conveying pipeline; a valve group IV and a pump II are arranged on the cathode solution conveying pipeline.

[0012] Specifically, the waste liquid storage bag comprises an anode fuel waste liquid recovery cabin and a cathode oxidant waste liquid recovery cabin; the liquid inlet end of the anode fuel waste liquid recovery cabin is connected with the direct sodium borohydride fuel cell through an anode waste liquid discharge pipeline, and a pump III is arranged on the anode waste liquid discharge pipeline; the liquid inlet end of the cathode oxidant waste liquid recovery cabin is connected with the direct sodium borohydride fuel cell through a cathode waste liquid discharge pipeline, and a pump IV is arranged on the cathode waste liquid discharge pipeline.

[0013] Specifically, the concentration of the hydrogen peroxide solution is 10.0 wt.%-70.0 wt.%, preferably 20 wt.%.

[0014] Specifically, the concentration of the sodium borohydride solution is 5 wt.%-30 wt.%, preferably 20 wt.%.

[0015] Specifically, the inner cavity of the pressure-resistant shell comprises, from top to bottom, a semi-open chamber, a raw material chamber, a raw material pump group chamber, a power supply chamber, a waste liquid pump group chamber and a waste liquid chamber.

[0016] Specifically, the pressure-resistant shell comprises a shell body, the top end of the shell body is open, and a watertight top plate, a first partition plate, a second partition plate, a third partition plate, a fourth partition plate, a fifth partition plate and a watertight bottom plate are sequentially arranged in the shell body from top to bottom, and the bottom end of the shell body is completely closed by the watertight bottom plate; the open space at the top end surrounded by the shell body and the watertight top plate is a semi-open chamber; the closed space surrounded by the shell body, the watertight top plate and the first partition plate is a raw material chamber; the closed space surrounded by the shell body, the first partition plate and the second partition plate is a raw material pump group chamber; the closed space surrounded by the shell body, the second partition plate and the third partition plate is a power supply chamber; the closed space surrounded by the shell body, the third partition plate and the fourth partition plate is a waste liquid pump group chamber; and the closed space surrounded by the shell body, the fourth partition plate and the fifth partition plate is a waste liquid chamber.

[0017] Compared with the prior art, the present application has the following beneficial technical effects: (I) The semi-open deep-sea buoy sodium borohydride fuel cell cabin provided by the present application has an energy density of 9300 Wh / kg, which is about 37 times higher than that of a conventional lithium battery (250 Wh / kg), and can still maintain an energy conversion efficiency of more than 90% in a deep-sea low-temperature environment, thus exhibiting more excellent stability. Not only can the endurance of the deep-sea buoy be greatly improved, but also the operation capability boundary of the deep-sea buoy can be greatly expanded, thus providing an excellent solution for the demand of long-period exploration operation of a bottom-mounted buoy in deep sea.

[0018] (II) The semi-open deep-sea buoy sodium borohydride fuel cell cabin provided by the present application makes full use of the advantage of rich water resources in the marine environment, carries sodium borohydride powder raw materials with very stable physicochemical properties, and continuously obtains seawater as a solvent, thus greatly improving the utilization rate of the internal space of the battery cabin.

[0019] (III) The semi-open deep-sea buoy sodium borohydride fuel cell cabin provided by the present application does not need to disassemble the battery cabin for power maintenance, and can be maintained by regularly rising to the surface to supplement solid sodium borohydride powder and liquid hydrogen peroxide from the reserved hole position and recycling waste liquid. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the semi-open deep-sea buoy sodium borohydride fuel cell cabin.

[0021] Figure 2 It is a schematic diagram of the internal structure of the semi-open deep-sea buoy sodium borohydride fuel cell cabin. It is a schematic diagram of the internal structure of the semi-open deep-sea buoy sodium borohydride fuel cell cabin.

[0022] Figure 3 is a schematic diagram of the working process of the semi-open deep-sea buoy sodium borohydride fuel cell cabin.

[0023] The meanings of the various reference numerals in the drawings are as follows: 1-seawater desalination membrane separation device, 2-anode fuel raw material storage cabin, 3-screw feeder, 4-anode fuel dissolution reaction cabin, 5-direct sodium borohydride fuel cell, 6-cathode solution storage cabin, 7-waste liquid storage bag, 8-lithium battery, 9-pressure-resistant shell, 10-pump, 11-check valve, 12-switch electromagnetic valve, 13-semi-open chamber, 14-raw material chamber, 15-raw material pump group chamber, 16-power supply chamber, 17-waste liquid pump group chamber, 18-waste liquid chamber.

[0024] 901-shell body, 902-water-tight top plate, 903-first partition plate, 904-second partition plate, 905-third partition plate, 906-fourth partition plate, 907-fifth partition plate, 908-water-tight bottom plate.

[0025] The technical solutions of the present application are further described below in conjunction with embodiments. DETAILED DESCRIPTION

[0026] It should be noted that all the components used in the present application, unless otherwise specified, are known components in the art.

[0027] In accordance with the above technical solutions, specific embodiments of the present application are given below. It should be noted that the present application is not limited to the following specific embodiments, and any equivalent variations made on the basis of the technical solutions of the present application fall within the scope of protection of the present application.

[0028] Example 1 This embodiment gives a semi-open deep-sea buoy sodium borohydride fuel cell cabin, which is used as a pressure-resistant electronic cabin for shallow-sea buoys, with a maximum working depth of 500 m and a maximum pressure resistance of 5 MPa. The cabin body can be made of aluminum alloy material, which is lightweight and easy to process. Under a cabin body diameter of 0.3 m, the wall thickness is calculated to be 12-15 mm according to the thin-walled formula. The top seawater desalination chamber is semi-open and can be directly contacted with seawater, relying on the side wall through hole to directly extract seawater. The design can accommodate 10 L, and when the power consumption rate is 0.1 L / min, the power generation working period for completely consuming the solution is 100 min. At a depth of 500 M, the outlet pressure of the centrifugal hydraulic pump is designed to be 8 MPa, and the water extraction rate is 1 L / min. When the pump efficiency is 60%, the power must reach 220 W.

[0029] As Figure 1As shown in Fig. 3, the battery cabin comprises a pressure-resistant shell 9, and the seawater desalination membrane separation device 1, the anode fuel raw material storage cabin 2, the screw feeder 3, the anode fuel dissolving reaction cabin 4, the direct sodium borohydride fuel cell 5, the cathode solution storage cabin 6, the waste liquid storage bag 7 and the lithium battery 8 are arranged in the pressure-resistant shell 9.

[0030] In this embodiment, the seawater desalination membrane separation device 1, the anode fuel raw material storage cabin 2, the screw feeder 3, the anode fuel dissolving reaction cabin 4, the direct sodium borohydride fuel cell 5, the cathode solution storage cabin 6 and the waste liquid storage bag 7 are connected through pipelines. According to actual needs, the pump 10, the check valve 11 and the on-off electromagnetic valve 12 are arranged.

[0031] As a specific scheme of this embodiment, the seawater desalination membrane separation device 1 comprises a seawater chamber and a fresh water chamber, the water inlet end of the seawater chamber is connected with the seawater environment outside, a reverse osmosis membrane is arranged in the seawater chamber, the water outlet end of the seawater chamber is connected with the water inlet end of the fresh water chamber through a water production conveying pipeline, and the valve group I and the filter are arranged on the water production conveying pipeline in sequence along the direction of water flow.

[0032] As a specific scheme of this embodiment, the anode fuel raw material storage cabin 2 stores sodium borohydride solid powder, the discharge end of the anode fuel raw material storage cabin 2 is connected with the feeding end of the screw feeder 3, and the discharge end of the screw feeder 3 is connected with the feeding port of the anode fuel dissolving reaction cabin 4.

[0033] As a specific scheme of this embodiment, the water inlet end of the anode fuel dissolving reaction cabin 4 is connected with the water outlet end of the fresh water chamber through a fresh water conveying pipeline, and the valve group II is arranged on the fresh water conveying pipeline.

[0034] As a specific scheme of this embodiment, the feeding end of the anode fuel dissolving reaction cabin 4 is connected with the discharge end of the screw feeder 3, the liquid outlet end of the anode fuel dissolving reaction cabin 4 is connected with the direct sodium borohydride fuel cell 5 through an anode solution conveying pipeline, and the valve group III and the pump I are arranged on the anode solution conveying pipeline in sequence along the direction of solution flow.

[0035] As a specific scheme of this embodiment, the cathode solution storage cabin 6 is connected with the direct sodium borohydride fuel cell 5 through a cathode solution conveying pipeline, and the valve group IV and the pump II are arranged on the cathode solution conveying pipeline in sequence along the direction of solution flow.

[0036] As a specific embodiment, the waste liquid storage bag 7 includes an anode fuel waste liquid recovery chamber and a cathode oxidant waste liquid recovery chamber; the inlet end of the anode fuel waste liquid recovery chamber is connected to the direct sodium borohydride fuel cell 5 through an anode waste liquid discharge pipe, and a pump III is installed on the anode waste liquid discharge pipe; the inlet end of the cathode oxidant waste liquid recovery chamber is connected to the direct sodium borohydride fuel cell 5 through a cathode waste liquid discharge pipe, and a pump IV is installed on the cathode waste liquid discharge pipe.

[0037] As a specific embodiment, valve group I includes a switching valve and a check valve; valve group II includes a switching valve and a check valve; valve group III includes a switching valve and a check valve; and valve group IV includes a switching valve and a check valve.

[0038] As a specific embodiment, the concentration of sodium borohydride solution in the anode fuel dissolution reaction chamber 4 is 20 wt.%; the concentration of hydrogen peroxide solution in the cathode solution storage chamber 6 is 20 wt.%.

[0039] As a specific embodiment, the pressure-resistant shell 9 includes a cylindrical shell body 901 with an open top. Inside the shell body 901, from top to bottom, are arranged a watertight top plate 902, a first partition 903, a second partition 904, a third partition 905, a fourth partition 906, a fifth partition 907, and a watertight bottom plate 908. The watertight bottom plate 908 completely seals the bottom of the shell body 901. The open space at the top formed by the shell body 901 and the watertight top plate 902 is a semi-open chamber 13. The sealed space enclosed by the watertight top plate 902 and the first partition 903 is the raw material chamber 14; the sealed space enclosed by the main shell 901, the first partition 903, and the second partition 904 is the raw material pump assembly chamber 15; the sealed space enclosed by the main shell 901, the second partition 904, and the third partition 905 is the power supply chamber 16; the sealed space enclosed by the main shell 901, the third partition 905, and the fourth partition 906 is the waste liquid pump assembly chamber 17; and the sealed space enclosed by the main shell 901, the fourth partition 906, and the fifth partition 907 is the waste liquid chamber 18. This structural arrangement forms an underwater sealed structure protecting the components within the chamber.

[0040] As a specific embodiment, a seawater desalination membrane separation device 1 is installed in the semi-open chamber 13. The seawater chamber, reverse osmosis membrane, valve group I, valve group II, filter, freshwater chamber, and product water conveying pipeline are all components of the seawater desalination membrane separation device 1. The raw material chamber 14 is equipped with an anode fuel raw material storage chamber 2, a screw conveyor 3, and an anode fuel dissolution reaction chamber 4. The raw material pump group chamber 15 is equipped with valve group III, pump I, valve group IV, and pump II. A direct sodium borohydride fuel cell 5 and a lithium battery 8 are fixedly installed on the third partition 905. The top of the direct sodium borohydride fuel cell 5 and the lithium battery 8 are located in the power supply chamber 16, and the bottom is located in the waste liquid pump group chamber 17. Pump III and pump IV are installed in the waste liquid pump group chamber 17.

[0041] As a specific embodiment, each partition is installed and fixed in series by multiple metal rods. The watertight top plate 902 and watertight bottom plate 908 are fixed to the inner wall of the shell body 901 at both ends by bolts. The axial ends of the metal rods are respectively fixed to the watertight top plate 902 and watertight bottom plate 908. According to the type of equipment and installation requirements of each compartment, alloy plates of appropriate thickness are selected and designed with openings to manufacture the above-mentioned partitions.

[0042] As a specific embodiment, the pressure hull 9 is used to withstand the external seawater pressure at the required operating depth of the underwater mooring. Its surface is reinforced with ribs, and the electronic compartment cover is bolted to the hull, with a sealing ring installed at the connection. The materials are generally high-strength aluminum alloy, titanium alloy, or non-metallic plexiglass, and all external surfaces in contact with seawater undergo anti-corrosion treatment.

[0043] As a specific solution in this embodiment, a control circuit board is used to control the valve group and the pump. The control circuit board is a microcontroller, which specifically includes a data acquisition and storage unit, a motor drive and control unit, a valve drive and control unit, a liquid level information sensing unit, etc., and is connected to each device and sensor via wires.

[0044] Example 2: This embodiment provides a semi-open deep-sea mooring sodium borohydride fuel cell compartment, the specific structure of which is basically the same as that of Embodiment 1. This compartment is used as a pressure-resistant electronic compartment for shallow-sea moorings. The difference from Embodiment 1 is that the pressure-resistant electronic compartment shell is made of fiberglass, which is corrosion-resistant and low-cost, but has lower compressive strength. According to the thin-wall formula, the wall thickness is more than 20mm.

[0045] Example 3: This embodiment presents a semi-open deep-sea mooring sodium borohydride fuel cell compartment, the specific structure of which is basically the same as that in Embodiment 1. This compartment serves as a pressure-resistant electronic compartment for moorings in medium-deep waters, with an operating depth range of 500–3000 m and a maximum withstand pressure of 30 MPa. It can be manufactured using high-strength steel, offering a high cost-performance ratio. With a compartment diameter of 0.5 m, the calculated wall thickness, considering corrosion allowance, is 32–36 mm. At a depth of 3000 m, a plunger-type hydraulic pump is used, designed with an outlet pressure of 35 MPa and a pumping rate of 1 L / min. When the pump efficiency is 60%, the power must reach 970 W.

[0046] Example 4: This embodiment presents a semi-open deep-sea mooring sodium borohydride fuel cell compartment, the specific structure of which is basically the same as that of Embodiment 3. This compartment is used as a pressure-resistant electronic compartment for moorings in medium-deep water areas. The difference from Embodiment 3 is that the pressure-resistant electronic compartment shell is made of stainless steel, which has higher corrosion resistance and can reduce corrosion allowance design, with a wall thickness of 30-32 mm.

[0047] Example 5: This embodiment provides a semi-open deep-sea mooring sodium borohydride fuel cell compartment, the specific structure of which is basically the same as that of Embodiment 1. This compartment serves as a pressure-resistant electronic compartment for deep-sea moorings, operating at depths of 3000–6000 m, with a maximum withstand pressure of 60 MPa. The compartment body can be manufactured using titanium alloy, possessing sufficient pressure resistance and corrosion resistance. With a compartment diameter of 1.0 m, the wall thickness, calculated using the thick-wall formula, is 80–85 mm. At a depth of 6000 m, the outlet pressure of the plunger-type hydraulic pump is designed to be 80 MPa, with a pumping rate of 1 L / min. When the pump efficiency is 60%, the power must reach 2.2 kW.

[0048] Example 6: This embodiment provides a semi-open deep-sea mooring sodium borohydride fuel cell compartment, the specific structure of which is basically the same as that of Embodiment 1. This compartment is designed as a pressure-resistant electronic compartment for bottom-mounted moorings, with an operating depth range of over 6000m and a lower limit calculated based on a pressure resistance of 60MPa. Alternatively, the compartment can be manufactured using titanium alloy and ceramic matrix composite materials, possessing ultra-high specific strength, temperature resistance, pressure resistance, and corrosion resistance. With a compartment diameter of 1.0m, the wall thickness, calculated using the thick-wall formula, is over 100mm. If the sea depth reaches 10000M, the outlet pressure of the plunger-type hydraulic pump must be greater than 100MPa, maintaining a pumping rate of 1L / min and a pump efficiency of 60%, requiring a power output exceeding 5kW.

[0049] The working process of this invention is as follows: First, before launching, sodium borohydride solid powder is pre-loaded into the anode fuel storage tank 2, and hydrogen peroxide solution is pre-loaded into the cathode solution storage tank 6.

[0050] Second, seawater is drawn from the outside and stored in the seawater chamber through the inlet. The reverse osmosis membrane can treat the seawater into fresh water. After opening valve group I, the fresh water is filtered by the filter and then transported through the product water delivery pipeline and stored in the fresh water chamber.

[0051] Third, after opening valve group II, the fresh water stored in the fresh water chamber flows into the anode fuel dissolution reaction chamber 4 through the fresh water conveying pipe; then the screw conveyor 3 is started, and the sodium borohydride solid powder stored in the anode fuel raw material storage chamber 2 is conveyed to the anode fuel dissolution reaction chamber 4 through the screw conveyor 3 and dissolved in the fresh water to form a sodium borohydride solution.

[0052] Fourth, valve group III is opened and pump I is started, allowing sodium borohydride solution to flow into the direct sodium borohydride fuel cell 5 through the anolyte delivery pipe; valve group IV is opened and pump II is started, allowing hydrogen peroxide solution to flow into the direct sodium borohydride fuel cell 5 through the cathode delivery pipe. Sodium borohydride is oxidized at the anode of the direct sodium borohydride fuel cell 5, releasing electrons. Sodium hydroxide participates in a reduction reaction at the cathode of the direct sodium borohydride fuel cell 5, gaining electrons and combining with water to generate hydroxide ions. Through the above reaction process, chemical energy is converted into electrical energy. At the end of the reaction, anode fuel waste liquid and cathode oxidant waste liquid are generated. The direct sodium borohydride fuel cell 5 is connected to the lithium battery 8 via wires. By working with the lithium battery 8, it outputs a stable voltage and current to power pump 10, solenoid valve 12, etc.

[0053] Fifth, start pump III, and the anode fuel waste liquid is discharged into the anode fuel waste liquid recovery tank through the anode waste liquid discharge pipe; start pump IV, and the cathode oxidant waste liquid is discharged into the cathode oxidant waste liquid recovery tank through the cathode waste liquid discharge pipe.

[0054] Sixth, after landing, the waste liquid in the anode fuel waste liquid recovery tank and the cathode oxidant waste liquid recovery tank is extracted, and sodium borohydride solid powder is added to the anode fuel raw material storage tank 2, and hydrogen peroxide solution is added to the cathode solution storage tank 6.

[0055] In summary, this invention replaces the single lead-acid, zinc-silver, or lithium batteries commonly used in deep-sea moorings with a direct sodium borohydride fuel cell. Furthermore, it designs a mobile power electronic cabin that can directly generate electricity from seawater, achieving ultra-long-term operation, which can greatly reduce the long-term operating cost of mooring power in the low-temperature environment of the deep sea.

[0056] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A semi-open deep-sea mooring sodium borohydride fuel cell compartment, characterized in that, It includes a pressure-resistant shell (9), and the pressure-resistant shell (9) is equipped with a seawater desalination membrane separation device (1), an anode fuel raw material storage tank (2), a screw conveyor (3), an anode fuel dissolution reaction tank (4), a direct sodium borohydride fuel cell (5), a cathode solution storage tank (6), and a waste liquid storage bag (7). The water outlet of the seawater desalination membrane separation device (1) is connected to the water inlet of the anode fuel dissolution reaction chamber (4); the anode fuel raw material storage chamber (2) stores sodium borohydride solid powder, the discharge end of the anode fuel raw material storage chamber (2) is connected to the feed end of the screw conveyor (3), and the discharge end of the screw conveyor (3) is connected to the feed port of the anode fuel dissolution reaction chamber (4); The outlet of the anode fuel dissolution reaction chamber (4) is connected to the inlet of the anode chamber of the direct sodium borohydride fuel cell (5), the outlet of the cathode solution storage chamber (6) is connected to the inlet of the cathode chamber of the direct sodium borohydride fuel cell (5), and the outlets of the anode chamber and the cathode chamber are both connected to the waste liquid storage bag (7).

2. The semi-open deep-sea mooring sodium borohydride fuel cell compartment as described in claim 1, characterized in that, It also includes lithium batteries (8).

3. The semi-open deep-sea mooring sodium borohydride fuel cell compartment as described in claim 1, characterized in that, The inlet of the anode fuel dissolution reaction chamber (4) is connected to the outlet of the fresh water chamber through a fresh water delivery pipe, and valve group II is installed on the fresh water delivery pipe.

4. The semi-open deep-sea mooring sodium borohydride fuel cell compartment as described in claim 1, characterized in that, The outlet end of the anode fuel dissolution reaction chamber (4) is connected to the direct sodium borohydride fuel cell (5) through the anode solution delivery pipe. The anode solution delivery pipe is equipped with valve group III and pump I.

5. The semi-open deep-sea mooring sodium borohydride fuel cell compartment as described in claim 1, characterized in that, The seawater desalination membrane separation device (1) includes a seawater chamber and a freshwater chamber. The inlet of the seawater chamber is connected to the external seawater environment. A reverse osmosis membrane is installed in the seawater chamber. The outlet of the seawater chamber is connected to the inlet of the freshwater chamber through a product water conveying pipe. A valve group I and a filter are installed on the product water conveying pipe.

6. The semi-open deep-sea mooring sodium borohydride fuel cell compartment as described in claim 1, characterized in that, The cathode solution storage chamber (6) is connected to the direct sodium borohydride fuel cell (5) through a cathode solution delivery pipeline; the cathode solution delivery pipeline is equipped with valve group IV and pump II.

7. The semi-open deep-sea mooring sodium borohydride fuel cell compartment as described in claim 1, characterized in that, The waste liquid storage bag (7) includes an anode fuel waste liquid recovery chamber and a cathode oxidant waste liquid recovery chamber; the inlet end of the anode fuel waste liquid recovery chamber is connected to the direct sodium borohydride fuel cell (5) through the anode waste liquid discharge pipe, and a pump III is installed on the anode waste liquid discharge pipe; the inlet end of the cathode oxidant waste liquid recovery chamber is connected to the direct sodium borohydride fuel cell (5) through the cathode waste liquid discharge pipe, and a pump IV is installed on the cathode waste liquid discharge pipe.

8. The semi-open deep-sea mooring sodium borohydride fuel cell compartment as described in claim 1, characterized in that, The anode chamber of the direct sodium borohydride fuel cell (5) contains a sodium borohydride solution, and the cathode chamber contains a hydrogen peroxide solution.

9. The semi-open deep-sea mooring sodium borohydride fuel cell compartment as described in claim 8, characterized in that, The concentration of sodium borohydride solution is 5 wt.% to 30 wt.%; the concentration of hydrogen peroxide solution is 10.0 wt.% to 70.0 wt.%.

10. The semi-open deep-sea mooring sodium borohydride fuel cell compartment as described in claim 1, characterized in that, The inner cavity of the pressure-resistant housing (9) includes a semi-open chamber (13), a raw material chamber (14), a raw material pump assembly chamber (15), a power supply chamber (16), a waste liquid pump assembly chamber (17), and a waste liquid chamber (18) arranged sequentially from top to bottom.

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