Seabed concrete ball battery

Abstract

The invention discloses a seabed concrete ball battery, and belongs to the technical field of ocean energy and energy storage. The battery comprises N energy storage power generation units which are connected in parallel, wherein each unit consists of a hollow concrete ball body, a concrete base, a water pump, a generator set, a valve system and a controller. The concrete ball body serves as a rigid negative pressure container, and vacuum energy storage is formed by emptying internal seawater; the concrete base is fixed to the seabed, all power and control equipment is contained in the concrete base, and a separated structure that the ball stores energy and the equipment is arranged in the base is achieved. Through the complete pressure-bearing design of the ball body and built-in protection of equipment, the structural safety and the equipment reliability are greatly improved; modularized and detachable connection is adopted, so that manufacturing, deployment and maintenance are facilitated; energy storage and power generation are achieved only through seawater entering and exiting, pollution is avoided, efficiency is high, and the device can be deployed in deep sea in a large-scale mode, is not limited by geographical conditions and meets the large-scale and long-time energy storage requirements of coastal and island power grids.

Description

Technical Field

[0001] This invention relates to the field of marine energy and energy storage technology, specifically to a subsea concrete sphere battery. Background Technology

[0002] As the proportion of renewable energy sources such as wind and solar power in the power grid continues to increase, their inherent intermittency and instability pose significant challenges to the stable operation of the grid. Therefore, developing large-scale, long-duration, and low-cost energy storage technologies has become crucial for promoting energy structure transformation. Currently, large-scale energy storage technologies mainly include pumped hydro storage, compressed air storage, and battery storage.

[0003] Pumped hydro storage: A mature technology with large capacity, it is currently the most widely used large-scale energy storage method. However, it heavily relies on specific geographical conditions (two reservoirs, one at a high altitude and one at a low altitude), has a long construction period, requires huge investment, and may impact the ecological environment. Compressed air storage: Also requires specific geological structures (such as salt caverns or abandoned mines) to store high-pressure air, resulting in significant geographical limitations and relatively low system efficiency. Lithium-ion battery and other chemical energy storage: Offers fast response and flexible deployment, but remains costly, suffers from cycle life degradation and safety issues, and the disposal of large-scale waste batteries poses a potential environmental burden.

[0004] To overcome the limitations of the aforementioned technologies, the industry has proposed the concept of energy storage using hydrostatic pressure. A search revealed the following relevant existing technologies: 1. This technology utilizes deep-sea pressure to store and generate energy through the inflation and deflation of deformable containers (such as airbags). Although it takes advantage of the deep-sea environment, the deformable containers it relies on are subject to risks such as material fatigue, seal failure, and limited lifespan due to long-term operation under deep-sea pressure. Furthermore, their complex structure makes maintenance difficult and manufacturing costs high.

[0005] 2. Chinese Patent CN118100138A discloses a "method, device, electronic equipment, and storage medium for underwater pumped-storage energy control." This technical solution directly installs a reversible pump-turbine unit on top of a concrete sphere. However, this design has significant drawbacks: First, opening a hole in the top of the concrete sphere and installing the unit severely compromises the integrity and mechanical uniformity of the sphere's structure. Under immense circulating water pressure stress, the opening easily becomes a stress concentration point, affecting the long-term stability and safety of the structure. Second, directly exposing the precision generator / motor unit to the harsh deep-sea environment exposes it to long-term effects such as seawater pressure, corrosion, and marine organism attachment, posing serious challenges to its reliability, lifespan, and maintenance difficulty.

[0006] In summary, existing large-scale energy storage technologies, including emerging underwater energy storage solutions, generally suffer from problems such as significant geographical limitations, high construction costs, vulnerability of key equipment, insufficient long-term reliability, and difficulty in maintenance.

[0007] Therefore, there is an urgent need in this field for a new type of large-scale energy storage technology that is not only not limited by inland geographical conditions, but also has strong structural integrity, good protection of core equipment, long life, low cost, easy maintenance and environmental friendliness. Summary of the Invention

[0008] The purpose of this invention is to provide a seabed concrete sphere battery to solve the problems mentioned in the background art.

[0009] To achieve the above objectives, the present invention provides the following technical solution: a seabed concrete sphere battery, comprising N parallel energy storage and power generation units, wherein N≥1, wherein the energy storage and power generation unit comprises a hollow concrete sphere, a concrete base, a water pump, a generator set, a valve system, and a controller; The hollow concrete sphere is made of a high-strength concrete shell with a sealed cavity inside. The sphere is used to form a negative pressure cavity after the seawater is drained, serving as a container for storing potential energy. The concrete base is fixedly installed on the seabed to provide stable support for the hollow concrete sphere. The hollow concrete sphere is detachably installed on the upper end of the concrete base. The concrete base has a cavity inside to accommodate related equipment. The water pump is installed in the internal cavity of the concrete base, and its inlet is connected to the internal cavity of the hollow concrete sphere through a first pipeline. The generator set is installed in the internal cavity of the concrete base, and its outlet is connected to the internal cavity of the hollow concrete sphere through a second pipeline. The valve system includes a first valve and a second valve. The first valve is installed on the outlet pipe of the water pump and is used to control the connection and isolation between the water pump and the outside ocean. The second valve is installed on the inlet pipe of the generator set and is used to control the connection and isolation between the generator set and the outside ocean. The controller is installed inside the concrete base. The water pump, generator set, first valve and second valve are all electrically connected to the controller. The controller can control the opening and closing of the valves and the start and stop of the water pump and generator set according to the power grid command. The surface of the concrete base is provided with a cable interface. The generator sets of multiple energy storage power generation units are connected in parallel through cables passing through the cable interface. The generator sets, water pumps and controllers are also connected to the outside world through cables in the cable interface.

[0010] Preferably, the diameter of the hollow concrete sphere is 9 to 30 meters.

[0011] Preferably, the controller integrates a pressure sensor and a temperature sensor, with the monitoring ends of the pressure sensor and temperature sensor respectively installed on the inner and outer sides of the hollow concrete sphere, for real-time monitoring of seawater pressure and temperature inside and outside the hollow concrete sphere.

[0012] Preferably, the openings of the first and second pipes inside the hollow concrete sphere are directly opposite the center of the hollow concrete sphere.

[0013] Preferably, a lifting ring is fixedly connected to the top of the hollow concrete sphere.

[0014] Preferably, the concrete base is provided with an installation and locking mechanism, which includes an annular seat, two movable plates and two locking plates. The annular seat is fixedly connected to the lower end of the hollow concrete sphere and is slidably connected to the inner wall of the concrete base. The two movable plates can move towards each other or in opposite directions in the internal cavity of the concrete base through a position adjustment mechanism. The locking plates are fixedly connected to the upper end of the movable plates and can be engaged with the annular groove on the surface of the annular seat.

[0015] Preferably, the position adjustment mechanism includes two fixed support plates, a limiting rod, a servo motor, and a bidirectional lead screw. The two fixed support plates are respectively fixedly connected to the inner bottom of the concrete base. The servo motor is fixedly connected to the outside of one of the fixed support plates. The limiting rod is fixedly connected between the two fixed support plates. The bidirectional lead screw is rotatably connected between the two fixed support plates, and the output end of the servo motor is drively connected to the end of the bidirectional lead screw. One end of the movable plate is slidably connected to the outside of the limiting rod, and the other end of the movable plate is threadedly connected to the outside of the bidirectional lead screw. The servo motor is electrically connected to the controller.

[0016] Preferably, the concrete base includes a first sealing mechanism, which includes an annular expansion ring, a first airbag, and a first air supply pipe. The annular expansion ring is embedded and fixedly installed at the upper end of the concrete base, the first airbag is snapped into the lower end of the concrete base, and the first air supply pipe is embedded in the inner wall of the concrete base. The upper end of the first air supply pipe is fixedly connected to the annular expansion ring, and the lower end of the first air supply pipe is fixedly connected to the first airbag.

[0017] Preferably, the top of the first airbag is threadedly connected to the lower end of the first air supply line.

[0018] Preferably, the concrete base further includes a second sealing mechanism, which includes a second airbag, an expansion sealing ring, and a second air supply pipe. The second airbag is fixedly connected to the surface of the movable plate and is located between the movable plate and the fixed support plate. The expansion sealing ring is fixedly connected to the inner wall of the cable interface, and the second airbag is fixedly connected to the expansion sealing ring through the second air supply pipe.

[0019] Beneficial effects This invention provides a subsea concrete sphere battery, which has the following beneficial effects: 1. This submarine concrete sphere battery features a hollow concrete sphere that is a completely sealed structure with no openings causing stress concentration and excellent pressure resistance. All power and control equipment is integrated into the concrete base, avoiding high pressure, corrosion, and biofouling, which significantly improves the equipment's lifespan and reliability.

[0020] 2. This submarine concrete sphere battery features a hollow concrete sphere and a concrete base that can be prefabricated separately and quickly assembled at sea. It is equipped with an installation locking mechanism and a sealing mechanism, which enables reliable connection and sealing between the hollow concrete sphere and the concrete base. This supports overall hoisting and separate maintenance, reducing operation and maintenance costs.

[0021] 3. The operation of this underwater concrete sphere battery involves only the intake and discharge of seawater, with no chemical pollution or emissions; the concrete sphere can serve as an artificial reef, promoting marine ecological development.

[0022] 4. The energy storage capacity of this subsea concrete sphere battery can be flexibly expanded according to the size of the sphere and the water depth, making it easy to achieve gigawatt-hour-level energy storage; the main material is concrete, which is abundant and inexpensive.

[0023] 5. This subsea concrete sphere battery can quickly switch between charging and discharging modes through a controller and valves, responding to grid peak shaving, frequency regulation, and other commands to improve grid stability.

[0024] 6. This subsea concrete sphere battery can be directly installed on the deep seabed, without relying on specific terrain, and is especially suitable for supporting energy storage in coastal, island and offshore wind power scenarios. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural diagram of an energy storage and power generation unit for a submarine concrete sphere battery proposed in this invention. Figure 2 This is a schematic cross-sectional view of the concrete base of a subsea concrete sphere battery proposed in this invention. Figure 3 This is a three-dimensional structural diagram of the installation and locking mechanism for a seabed concrete sphere battery proposed in this invention. Figure 4This is a schematic diagram of the first sealing mechanism of a submarine concrete sphere battery proposed in this invention; Figure 5 This is a schematic diagram of the second sealing mechanism of a submarine concrete sphere battery proposed in this invention.

[0026] In the diagram: 1. Hollow concrete sphere; 2. Concrete base; 3. Water pump; 4. Generator set; 5. Controller; 6. First pipeline; 7. Second pipeline; 8. First valve; 9. Second valve; 10. Outlet pipeline; 11. Inlet pipeline; 12. Cable interface; 13. Lifting ring; 14. Installation locking mechanism; 15. Annular seat; 16. Movable plate; 17. Snap-fit ​​plate; 18. Annular slot; 19. Fixed support plate; 20. Limiting rod; 21. Servo motor; 22. Bidirectional lead screw; 23. Annular expansion ring; 24. First airbag; 25. First air supply pipeline; 26. Second airbag; 27. Expansion sealing ring; 28. Second air supply pipeline. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] 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," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and 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 this invention.

[0029] 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.

[0030] 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, an electrical connection, or a connection that allows communication between them; 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.

[0031] Example 1, please refer to Figure 1-4 The present invention provides a technical solution: a seabed concrete sphere battery, comprising N parallel energy storage and power generation units, wherein N≥1, and the energy storage and power generation unit comprises a hollow concrete sphere 1, a concrete base 2, a water pump 3, a generator set 4, a valve system and a controller 5. The hollow concrete sphere 1 is made of a high-strength concrete shell with a sealed cavity inside. The diameter of the hollow concrete sphere 1 is 9 to 30 meters. The sphere is used to form a negative pressure cavity after the seawater is drained, serving as a container for storing potential energy. As a rigid negative pressure container, the hollow concrete sphere 1 directly utilizes the hydrostatic pressure of the deep sea as the driving force, compared to flexible materials that are prone to aging. It has a simple structure, high energy density, and long service life.

[0032] The concrete base 2 is fixedly installed on the seabed. The concrete base 2 is cylindrical. This design can improve the structural strength of the concrete base 2 and provide stable support for the hollow concrete sphere 1. The hollow concrete sphere 1 can be detachably installed on the upper end of the concrete base 2. The concrete base 2 has a cavity inside to accommodate related equipment. The water pump 3 is installed in the internal cavity of the concrete base 2, and its inlet is connected to the internal cavity of the hollow concrete sphere 1 through the first pipe 6. The generator set 4 is installed in the internal cavity of the concrete base 2, and its outlet is connected to the internal cavity of the hollow concrete sphere 1 through the second pipe 7. The openings of the first pipe 6 and the second pipe 7 inside the hollow concrete sphere 1 are directly opposite the center of the hollow concrete sphere 1. This design can make the stress on the contact surface between the first pipe 6 and the second pipe 7 and the hollow concrete sphere 1 more uniform, thereby further improving the structural strength of the hollow concrete sphere 1.

[0033] The valve system includes a first valve 8 and a second valve 9. The first valve 8 is installed on the outlet pipe 10 of the water pump 3 and is used to control the connection and isolation between the water pump 3 and the outside ocean. The second valve 9 is installed on the inlet pipe 11 of the generator set 4 and is used to control the connection and isolation between the generator set 4 and the outside ocean. Among them, the water pump 3, generator set 4, first pipeline 6 and second pipeline 7 are independent of each other, and the outlet pipeline 10 and inlet pipeline 11 are controlled by the first valve 8 and the second valve 9 respectively, so that the energy storage and power generation processes can operate under optimal conditions without interfering with each other, thereby improving the overall efficiency and controllability of the system.

[0034] The controller 5 is installed inside the concrete base 2. The water pump 3, generator set 4, first valve 8 and second valve 9 are all electrically connected to the controller 5. The controller 5 can control the opening and closing of the valves and the start and stop of the water pump 3 and generator set 4 according to the power grid command. The surface of the concrete base 2 is provided with a cable interface 12. The generator sets 4 of multiple energy storage power generation units are connected in parallel through cables passing through the cable interface 12. The generator sets 4, water pumps 3 and controllers 5 are also connected to the outside world through cables in the cable interface 12.

[0035] The controller 5 integrates a pressure sensor and a temperature sensor. The monitoring ends of the pressure sensor and the temperature sensor are installed on the inner and outer sides of the hollow concrete sphere 1, respectively, to monitor the seawater pressure and temperature inside and outside the hollow concrete sphere 1 in real time.

[0036] Energy storage mode (charging process): When there is excess power in the power grid, controller 5 receives a command, opens the first valve 8, and starts water pump 3. The excess power from the grid drives water pump 3 to force seawater inside the hollow concrete sphere 1 out to the external ocean through the first pipe 6 and the first valve 8. As the seawater is discharged, a near-vacuum low-pressure environment gradually forms inside the hollow concrete sphere 1. When the water level inside the sphere drops to its minimum or the pressure reaches the set value, controller 5 closes the first valve 8 and stops water pump 3. At this time, electrical energy is converted into potential energy stored between the vacuum inside the sphere and the high pressure of the external deep sea.

[0037] Power generation mode (discharge process): When the grid power is insufficient, controller 5 receives a command and opens the second valve 9 on the generator pipeline. At this time, because the interior of the hollow concrete sphere 1 is a near-vacuum low-pressure environment, while the outside is high-pressure deep-sea water, the huge pressure difference drives the external seawater to rush into the second pipeline 7 through the second valve 9. The high-speed water flow impacts and drives the turbine of the generator set 4 to rotate, thereby driving the generator to generate electricity, which is then transmitted to the grid. When the interior of the sphere is filled with seawater or the pressure is balanced, the power generation process ends, and controller 5 closes the second valve 9. The system returns to standby mode, ready for the next energy storage cycle.

[0038] This invention creatively adopts a "spherical energy storage, base equipment" architecture. All power and control equipment, such as water pump 3, generator set 4, valves and controllers 5, are integrated into a robust concrete base 2, realizing the modularity and standardization of the system, facilitating manufacturing, deployment and maintenance, while protecting the core equipment from the direct impact of the marine environment.

[0039] Specifically, the hollow concrete sphere 1 is a complete, non-porous pressure-bearing structure with excellent mechanical properties, eliminating the risk of stress concentration and greatly improving safety and durability. Secondly, the concrete base 2 provides a relatively controlled compartment environment for the core equipment, effectively avoiding the direct impact, corrosion, and biofouling of high-pressure seawater, significantly improving the equipment's reliability and service life, and reducing maintenance costs and difficulties. Furthermore, the hollow concrete sphere 1 and the concrete base 2 can be prefabricated separately and then installed at sea. The equipment is concentrated on the concrete base 2, facilitating centralized operation during construction, commissioning, and future maintenance.

[0040] The top of the hollow concrete sphere 1 is fixedly connected to a lifting ring 13. By setting the lifting ring 13 and cooperating with a crane, the hollow concrete sphere 1 together with the concrete base 2 can be conveniently dropped to the seabed at sea, or the hollow concrete sphere 1 together with the concrete base 2 can be lifted out of the sea for later maintenance.

[0041] The concrete base 2 is equipped with a locking mechanism 14, which includes an annular seat 15, two movable plates 16 and two locking plates 17. The annular seat 15 is fixedly connected to the lower end of the hollow concrete sphere 1 and is slidably connected to the inner wall of the concrete base 2. The two movable plates 16 can move towards each other or in opposite directions in the internal cavity of the concrete base 2 through a position adjustment mechanism. The locking plates 17 are fixedly connected to the upper end of the movable plates 16 and can be engaged with the annular groove 18 on the surface of the annular seat 15.

[0042] The position adjustment mechanism includes two fixed support plates 19, a limit rod 20, a servo motor 21, and a bidirectional lead screw 22. The two fixed support plates 19 are respectively fixedly connected to the inner bottom of the concrete base 2. The servo motor 21 is fixedly connected to the outside of one of the fixed support plates 19. The limit rod 20 is fixedly connected between the two fixed support plates 19. The bidirectional lead screw 22 is rotatably connected between the two fixed support plates 19, and the output end of the servo motor 21 is connected to the end of the bidirectional lead screw 22. One end of the movable plate 16 is slidably connected to the outside of the limit rod 20, and the other end of the movable plate 16 is threadedly connected to the outside of the bidirectional lead screw 22. The servo motor 21 is electrically connected to the controller 5.

[0043] By setting up the locking mechanism 14 and using the controller 5 to control the servo motor 21, the bidirectional lead screw 22 can be rotated. The limit rod 20 limits the movable plate 16. With the rotation of the bidirectional lead screw 22, the two movable plates 16 can be driven to move towards each other or in opposite directions. By moving the two movable plates 16 in opposite directions away from each other, the locking plate 17 and the annular slot 18 can be engaged with each other. By engaging the locking plate 17 and the annular slot 18, the annular seat 15 and the concrete base 2 can be relatively fixed, thereby achieving the relative fixation of the hollow concrete sphere 1 and the concrete base 2, effectively improving the installation speed of the hollow concrete sphere 1.

[0044] When maintenance is required on the equipment inside the concrete base 2, the entire energy storage and power generation unit can be lifted out of the sea. Then, the servo motor 21 can be rotated in the opposite direction by the controller 5, which can drive the two movable plates 16 to move towards each other. At this time, the snap plate 17 will disengage from the annular snap groove 18, so that the concrete base 2 can be easily separated from the hollow concrete sphere 1, which facilitates the subsequent maintenance of the equipment inside the concrete base 2.

[0045] Example 2, please refer to Figure 4 Including Embodiment 1, and based on Embodiment 1, the present invention provides a technical solution: the concrete base 2 includes a first sealing mechanism, the first sealing mechanism includes an annular expansion ring 23, a first airbag 24 and a first air supply pipe 25, the annular expansion ring 23 is embedded and fixedly installed at the upper end of the concrete base 2, the first airbag 24 is snapped into the lower end of the concrete base 2, the first air supply pipe 25 is embedded in the inner wall of the concrete base 2, and the upper end of the first air supply pipe 25 is fixedly connected to the annular expansion ring 23, the lower end of the first air supply pipe 25 is fixedly connected to the first airbag 24, the top of the first airbag 24 is threadedly connected to the lower end of the first air supply pipe 25, and the first airbag 24 is threadedly connected to the lower end of the first air supply pipe 25. This design facilitates the replacement of the first airbag 24.

[0046] When the concrete base 2 is installed and fixed on the seabed, the external seawater pressure and the weight of the concrete base 2 itself compress the first air bladder 24, which can force the air in the first air bladder 24 into the annular expansion ring 23 through the first air supply pipe 25. After the annular expansion ring 23 is filled with air, it will expand and thus fit tightly against the outer surface of the hollow concrete sphere 1, effectively preventing leakage between the hollow concrete sphere 1 and the concrete base 2, which could lead to damage to the internal equipment of the concrete base 2.

[0047] Example 3, please refer to Figure 5Including Embodiment 2, and based on Embodiment 2, the present invention provides a technical solution: the concrete base 2 further includes a second sealing mechanism, the second sealing mechanism including a second airbag 26, an expansion sealing ring 27, and a second air supply pipe 28. The second airbag 26 is fixedly connected to the surface of the movable plate 16 and is located between the movable plate 16 and the fixed support plate 19. The expansion sealing ring 27 is fixedly connected to the inner wall of the cable interface 12, and the second airbag 26 is fixedly connected to the expansion sealing ring 27 through the second air supply pipe 28. When the snap-fit ​​plate 17 is engaged with the annular snap-fit ​​groove 18, the air in the second airbag 26 can enter the expansion sealing ring 27 through the second air supply pipe 28 and cause the expansion sealing ring 27 to expand.

[0048] When the snap plate 17 engages with the annular slot 18, the movable plate 16 will cause the second airbag 26 and the fixed support plate 19 to squeeze each other. At this time, the air in the second airbag 26 will enter the expansion sealing ring 27 through the second air supply line 28. The expansion sealing ring 27 expands and squeezes the cable, which can effectively improve the sealing performance of the cable interface 12.

[0049] The accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments of this disclosure. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other. In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A seabed concrete sphere battery, comprising N parallel energy storage and power generation units, wherein N≥1, wherein the energy storage and power generation unit comprises a hollow concrete sphere (1), a concrete base (2), a water pump (3), a generator set (4), a valve system and a controller (5). The hollow concrete sphere (1) is made of a high-strength concrete shell with a sealed cavity inside. The sphere is used to form a negative pressure cavity after the seawater is drained, serving as a container for storing potential energy. The concrete base (2) is fixedly installed on the seabed to provide stable support for the hollow concrete sphere (1). The hollow concrete sphere (1) is detachably installed on the upper end of the concrete base (2). The concrete base (2) has a cavity inside to accommodate related equipment. The water pump (3) is installed in the internal cavity of the concrete base (2), and its inlet is connected to the internal cavity of the hollow concrete sphere (1) through the first pipeline (6); The generator set (4) is installed in the internal cavity of the concrete base (2), and its outlet is connected to the internal cavity of the hollow concrete sphere (1) through the second pipeline (7); The valve system includes a first valve (8) and a second valve (9). The first valve (8) is installed on the outlet pipe (10) of the water pump (3) and is used to control the connection and isolation between the water pump (3) and the outside ocean. The second valve (9) is installed on the inlet pipe (11) of the generator set (4) and is used to control the connection and isolation between the generator set (4) and the outside ocean. The controller (5) is installed inside the concrete base (2). The water pump (3), generator set (4), first valve (8) and second valve (9) are all electrically connected to the controller (5). The controller (5) can control the opening and closing of the valves and the start and stop of the water pump (3) and generator set (4) according to the power grid command. The concrete base (2) is provided with a cable interface (12). The generator sets (4) of the multiple energy storage power generation units are connected in parallel through the cable interface (12). The generator sets (4), water pumps (3) and controllers (5) are also connected to the outside world through the cables in the cable interface (12).

2. The subsea concrete sphere battery according to claim 1, characterized in that: The diameter of the hollow concrete sphere (1) is 9 to 30 meters.

3. The subsea concrete sphere battery according to claim 1, characterized in that: The controller (5) integrates a pressure sensor and a temperature sensor. The monitoring ends of the pressure sensor and the temperature sensor are respectively installed on the inner and outer sides of the hollow concrete sphere (1) to monitor the seawater pressure and temperature inside and outside the hollow concrete sphere (1) in real time.

4. A subsea concrete sphere battery according to claim 1, characterized in that: The openings of the first pipe (6) and the second pipe (7) inside the hollow concrete sphere (1) are directly opposite the center of the hollow concrete sphere (1).

5. A subsea concrete sphere battery according to claim 1, characterized in that: The top of the hollow concrete sphere (1) is fixedly connected to a lifting ring (13).

6. A subsea concrete sphere battery according to claim 1, characterized in that: The concrete base (2) is provided with an installation locking mechanism (14). The installation locking mechanism (14) includes an annular seat (15), two movable plates (16) and two locking plates (17). The annular seat (15) is fixedly connected to the lower end of the hollow concrete sphere (1), and the annular seat (15) is slidably connected to the inner wall of the concrete base (2). The two movable plates (16) can move towards each other or in opposite directions in the internal cavity of the concrete base (2) through a position adjustment mechanism. The locking plates (17) are fixedly connected to the upper end of the movable plates (16), and the locking plates (17) can fit into the annular groove (18) on the surface of the annular seat (15).

7. A subsea concrete sphere battery according to claim 6, characterized in that: The position adjustment mechanism includes two fixed support plates (19), a limiting rod (20), a servo motor (21), and a bidirectional lead screw (22). The two fixed support plates (19) are respectively fixedly connected to the inner bottom of the concrete base (2). The servo motor (21) is fixedly connected to the outside of one of the fixed support plates (19). The limiting rod (20) is fixedly connected between the two fixed support plates (19). The bidirectional lead screw (22) is rotatably connected between the two fixed support plates (19). The output end of the servo motor (21) is connected to the end of the bidirectional lead screw (22) for transmission. One end of the movable plate (16) is slidably connected to the outside of the limiting rod (20). The other end of the movable plate (16) is threadedly connected to the outside of the bidirectional lead screw (22). The servo motor (21) is electrically connected to the controller (5).

8. A subsea concrete sphere battery according to claim 1, characterized in that: The concrete base (2) includes a first sealing mechanism, which includes an annular expansion ring (23), a first airbag (24) and a first air supply pipe (25). The annular expansion ring (23) is embedded and fixedly installed on the upper end of the concrete base (2). The first airbag (24) is snapped into the lower end of the concrete base (2). The first air supply pipe (25) is embedded in the inner wall of the concrete base (2), and the upper end of the first air supply pipe (25) is fixedly connected to the annular expansion ring (23), and the lower end of the first air supply pipe (25) is fixedly connected to the first airbag (24).

9. A subsea concrete sphere battery according to claim 8, characterized in that: The top of the first airbag (24) is threaded to the lower end of the first air supply line (25).

10. A subsea concrete sphere battery according to claim 7, characterized in that: The concrete base (2) also includes a second sealing mechanism, which includes a second airbag (26), an expansion sealing ring (27), and a second air supply line (28). The second airbag (26) is fixedly connected to the surface of the movable plate (16) and is located between the movable plate (16) and the fixed support plate (19). The expansion sealing ring (27) is fixedly connected to the inner wall of the cable interface (12) and the second airbag (26) is fixedly connected to the expansion sealing ring (27) through the second air supply line (28).

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