Flexible controllable gravity energy storage device and energy release method thereof

Abstract

The invention provides a flexible controllable gravity energy storage device and an energy release method thereof. The energy release method comprises the steps that a controller obtains rated electric energy output power of a reversible motor; according to the gravitational potential energy output power released in the sinking motion of the gravitational energy storage bag in the liquid medium, the magnitude of the gravitational potential energy output power and the rated electric energy output power is judged; when the gravitational potential energy output power is smaller than the rated electric energy output power, the auxiliary driving device is started to jointly drive the transmission shaft of the reversible motor to obtain the stable rated rotating speed, and the reversible motor obtains the stable rated electric energy output power. The gravity energy storage bag is used as a counter weight, after the gravity energy storage bag with the internal gas content capable of being changed is placed in a sea or a lake, regulation and control of gravitational potential energy release are achieved by changing the gas content and further by means of buoyancy, and an auxiliary driving device is arranged to supplement energy so as to meet the output power needed by power grid dispatching.

Description

Technical Field

[0001] This invention belongs to the field of gravity energy storage technology, and specifically relates to a flexible and controllable gravity energy storage device and its energy release method. Background Technology

[0002] Gravity energy storage has advantages such as low cost, high reliability, and wide applicability, and has seen rapid development in recent years. Its basic principle is based on the elevation difference of the energy storage medium. When the grid has sufficient energy, the excess power drives a reversible motor to lift the counterweight (energy storage medium) to a certain height, converting electrical energy into the gravitational potential energy of the counterweight. When the grid needs electricity, the counterweight descends under its own weight, driving the reversible motor to rotate in the opposite direction and generate electricity, converting the counterweight's gravitational potential energy into electrical energy, thus completing the charging and discharging process of the energy storage system. However, current gravity energy storage suffers from problems such as poor discharge power control, short discharge storage time, and environmental pollution caused by the manufacture of concrete counterweights. Summary of the Invention

[0003] To address the above problems, this invention proposes a method for releasing energy from a flexible and controllable gravity energy storage device, comprising the following steps:

[0004] The controller obtains the rated electrical energy output power of the reversible motor;

[0005] Based on the gravitational potential energy output power released by the gravity energy storage pack during its sinking motion in the liquid medium, determine the magnitude of the gravitational potential energy output power and the rated electrical energy output power.

[0006] When the gravitational potential energy output power is less than the rated electrical energy output power, the auxiliary drive device is started to jointly drive the transmission shaft of the reversible motor to obtain a stable rated speed, so that the reversible motor can obtain a stable rated electrical energy output power.

[0007] When the gravitational potential energy output power of the gravity storage bag during its sinking motion is greater than or equal to the electrical energy output power of the reversible motor, the controller starts the self-feedback air compressor to adjust the air volume in the inner cavity of the gravity storage bag and shuts down the auxiliary drive device to maintain the gravitational potential energy output power consistent with the electrical energy output power of the reversible motor, so that the reversible motor can output stable rated electrical energy.

[0008] Furthermore, the controller is also used to obtain the weight, volume, and sinking speed of the gravity storage pack;

[0009] The gravitational potential energy output power of the gravity storage pack is the product of its weight and its sinking velocity.

[0010] Furthermore, the controller is also used to obtain the density and drag coefficient of the liquid medium, and to calculate the buoyancy and motion resistance of the gravity energy storage pack.

[0011] When the output power of gravitational potential energy is the same as the output power of electrical energy of the reversible motor, the sum of the motion resistance and buoyancy experienced by the gravitational energy storage bag during its sinking motion in the liquid medium is the same as the gravity.

[0012] The present invention also proposes a flexible and controllable gravity energy storage device for use in liquid media environments, comprising: a gravity energy storage bag, a reversible motor, an auxiliary drive device, a self-feedback air compressor, and a controller;

[0013] The drive shaft of the reversible motor is connected to the auxiliary drive device and the gravity energy storage pack to realize the energy conversion between the reversible motor, the auxiliary drive device, and the gravity energy storage pack.

[0014] The output of the self-feedback air compressor is connected to the inner cavity of the gravity energy storage pack through a conduit, and the volume of the gravity energy storage pack is adjusted to change the speed of the gravity energy storage pack in the liquid medium.

[0015] Furthermore, the gravity storage pack is filled with a gravity load, the density of which is greater than the density of the liquid medium mentioned above.

[0016] Furthermore, an air valve is installed on the gravity energy storage pack. The air valve is electrically connected to the controller, and the valve port of the air valve is connected to the output end of the self-feedback air compressor through a conduit.

[0017] Furthermore, one end of a steel cable is connected to the upper end of the gravity energy storage bag, and the other end of the steel cable is wound around a roller on the drive shaft of a fixed reversible motor.

[0018] Furthermore, the gravity energy storage pack is made of elastic materials.

[0019] Furthermore, the outer surface of the gravity energy storage pack is coated with a waterproof and corrosion-resistant layer.

[0020] Furthermore, the reversible motor's power receiving end is connected to a photovoltaic power generation system and / or a wind power generation system, while the reversible motor's power output end is connected to a household load and / or a public power grid.

[0021] The flexible and controllable gravity energy storage device and its energy release method of the present invention can be applied to locations such as seas and lakes. Using a gravity energy storage pack as a counterweight, after placing the gravity energy storage pack, whose internal gas content can be changed, into the sea or lake, the descent depth and speed of the gravity energy storage pack can be controlled by changing the gas content inside the pack, and then by utilizing the buoyancy generated by the sea or lake on the object, thereby achieving regulation of the release of gravitational potential energy. Furthermore, by setting an auxiliary drive device, energy can be supplemented when the release of gravitational potential energy cannot meet the power demand, thereby ensuring that the electrical energy output by the reversible motor remains in a steady state to meet the output power required by the power grid dispatch.

[0022] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description and the drawings. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 A schematic diagram of the energy release method of the flexible and controllable gravity energy storage device in an embodiment of the present invention is shown;

[0025] Figure 2 A schematic diagram of a flexible and controllable gravity energy storage device is shown in an embodiment of the present invention.

[0026] In the diagram, there are: 1. Gravity energy storage unit; 2. Reversible motor; 3. Auxiliary drive device; 4. Self-feedback air compressor; and 5. Air valve. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, 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] This invention provides a flexible and controllable gravity energy storage device and its energy release method. Figure 1 A schematic diagram of the energy release method of the flexible and controllable gravity energy storage device in an embodiment of the present invention is shown. Figure 1 The energy release method of a flexible and controllable gravity energy storage device includes the following steps:

[0029] The controller obtains the rated electrical energy output power of the reversible motor 2;

[0030] Based on the gravitational potential energy output power released by the gravity energy storage pack 1 during its sinking motion in the liquid medium, determine the magnitude of the gravitational potential energy output power and the rated electrical energy output power.

[0031] When the gravitational potential energy output power is less than the rated electrical energy output power, the auxiliary drive device 3 is started to jointly drive the transmission shaft of the reversible motor 2 to obtain a stable rated speed, so that the reversible motor 2 can obtain a stable rated electrical energy output power.

[0032] When the gravitational potential energy output power of the gravity storage pack 1 during its sinking motion is greater than or equal to the electrical energy output power of the reversible motor 2, the controller starts the self-feedback air compressor 4 to adjust the amount of air in the cavity of the gravity storage pack 1 and shuts off the auxiliary drive device 3, so as to maintain the gravitational potential energy output power consistent with the electrical energy output power of the reversible motor 2, so that the reversible motor 2 can output stable rated electrical energy.

[0033] The energy release method of the flexible and controllable gravity energy storage device proposed in this application can be applied to places with sea, lake and other similar locations. Using gravity energy storage pack 1 as a counterweight, the gravity potential energy of gravity energy storage pack 1 can be converted into electrical energy during the descent process. The electrical output power of reversible motor 2 is positively correlated with the instantaneous speed of gravity energy storage pack 1 during descent. That is, the faster gravity energy storage pack 1 descends, the greater the electrical output power of reversible motor 2.

[0034] After placing a gravity energy storage pack 1, whose internal gas content can be altered, into the sea or lake, the descent depth and speed of the gravity energy storage pack 1 can be controlled by altering the gas content inside the pack and utilizing the buoyancy generated by the sea or lake. This allows for the regulation of the release of gravitational potential energy. Furthermore, by setting up an auxiliary drive device 3, energy can be supplemented when the release of gravitational potential energy cannot meet the power demand, thereby ensuring that the electrical energy output by the reversible motor 2 remains in a steady state to meet the output power required by the power grid dispatch.

[0035] Based on the rated electrical energy output power obtained from the reversible motor 2, the controller starts the gravity energy storage pack 1 and compares the gravitational potential energy output power with the rated electrical energy output power. When the gravitational potential energy output power is less than the rated electrical energy output power, the auxiliary drive device 3 is started to assist until the gravitational potential energy output power equals the rated electrical energy output power. Then, the auxiliary drive device 3 is turned off, and the self-feedback air compressor 4 is started to adjust the size of the gravity energy storage pack 1. This controls the magnitude of buoyancy and motion resistance to maintain the gravitational potential energy output power equal to the rated electrical energy output power, ensuring that the reversible motor 2 outputs a stable rated electrical energy.

[0036] When the gravitational potential energy output power equals the rated electrical energy output power, the self-feedback air compressor 4 is started, and the volume of the gravity energy storage pack 1 is adjusted to maintain the gravitational potential energy output power unchanged; when the gravitational potential energy output power is greater than the rated electrical energy output power, the volume of the gravity energy storage pack 1 is increased, thereby increasing the buoyancy and motion resistance, reducing the gravitational potential energy output power to be equal to the rated electrical energy output power, and then maintaining the reversible motor 2 to provide a stable rated electrical energy output.

[0037] In the energy release method of the device in this application, the controller is also used to obtain the weight F of the gravity energy storage package 1. 重 Volume V 体 and the sinking velocity V;

[0038] Among them, the gravitational potential energy output power of gravity energy storage package 1 is its weight F. 重 The product of the sinking velocity V;

[0039] That is, when the gravitational potential energy output power P of the gravitational energy storage package 1 sinks, it is... 重 The electrical energy output power P of the reversible motor 2 电 When consistent, P 重 =M*g*V=P 电 , where g is a constant, which is the ratio of gravity to mass, and we take g = 9.8 N / kg.

[0040] Furthermore, in the energy release method of the device in this application, the controller is also used to obtain the density ρ of the liquid medium. 液 Calculate the buoyancy F acting on gravity energy storage package 1. 浮 Specifically:

[0041] F 浮 =ρ 液 *V 体 *g

[0042] Where, ρ 液 Density of a liquid medium, expressed in kg / m³ 3 g is a constant, representing the ratio of gravity to mass; we take g = 9.8 N / kg. V 体 This represents the volume of gravity energy storage package 1, in cubic meters (m³). 3 ;

[0043] The controller is also used to obtain the drag coefficient C of the liquid medium and calculate the motion resistance F experienced by the gravity energy storage package 1 when it moves in the aforementioned liquid medium. 阻 Specifically:

[0044] F 阻 =0.5*C*ρ 液 *A*V 2

[0045] Where, ρ液 The density of a liquid medium is expressed in kg / m³. 3 A is the cross-sectional area of ​​gravity energy storage package 1, in meters. 3 V represents the sinking velocity of gravity energy storage package 1, in m / s.

[0046] When the output power of gravitational potential energy is consistent with the output power of electrical energy of reversible motor 2, the controller controls the self-feedback air compressor 4 to adjust the amount of air in the inner cavity of gravity energy storage bag 1 and shuts off the auxiliary drive device 3, so that the sum of the motion resistance and buoyancy force on gravity energy storage bag 1 is the same as the gravity force, specifically: F 浮 +F 阻 =M*g, where g is a constant and is the ratio of gravity to mass, taken as g = 9.8 N / kg.

[0047] Correspondingly, in the energy storage mode, the controller adjusts the self-feedback air compressor 4 to completely evacuate the air from the inner cavity of the gravity energy storage pack 1, so that the volume of the gravity energy storage pack 1 returns to its minimum initial state. Under this condition, the buoyancy and motion resistance of the gravity energy storage pack 1 are minimized, which meets the requirement of maximizing the efficiency of the process of converting electrical energy into gravitational potential energy.

[0048] refer to Figure 2 This invention proposes a flexible and controllable gravity energy storage device, comprising: a gravity energy storage package 1, a reversible motor 2, an auxiliary drive device 3, a self-feedback air compressor 4, and a controller;

[0049] The transmission shaft of the reversible motor 2 is connected to the auxiliary drive device 3 and the gravity energy storage pack 1 to realize the energy conversion between the reversible motor 2, the auxiliary drive device 3, and the gravity energy storage pack 1.

[0050] The output end of the self-feedback air compressor 4 is connected to the inner cavity of the gravity energy storage pack 1 through a conduit, thereby adjusting the volume of the gravity energy storage pack 1 to change its speed of movement in the liquid medium.

[0051] Specifically, the gravity energy storage pack 1 is filled with a gravity carrier, and the density of the gravity carrier is greater than the density of the liquid medium mentioned above, so as to ensure that the gravity energy storage pack 1 can sink in the liquid medium when there is no gas filling it. The gravity carrier is preferably a metal ball or a high-density heavy liquid, physiological saline, etc., which facilitates the shape change of the gravity energy storage pack 1 while ensuring that its own weight is greater than the buoyancy force.

[0052] Specifically, an air valve 5 is installed on the gravity energy storage pack 1. The air valve 5 is electrically connected to the controller, and the valve port of the air valve 5 is connected to the output end of the self-feedback air compressor 4 through a conduit. The internal space of the gravity energy storage pack 1 can be directly sealed through the air valve 5 to prevent backflow of air or liquid inside the gravity energy storage pack 1 and reduce the operating pressure of the self-feedback air compressor 4. At the same time, by adjusting the size of the valve port of the air valve 5, the flow of gas is limited, thereby achieving precise control of the flow of gas.

[0053] Specifically, one end of a steel cable is connected to the upper part of the gravity energy storage pack 1, and the other end of the steel cable is wound around a roller on the drive shaft of the reversible motor 2. When the gravity energy storage pack 1 moves downward, it will drive the roller to rotate synchronously, which in turn drives the drive shaft of the reversible motor 2 to rotate. When the drive shaft of the reversible motor 2 rotates in the opposite direction, the roller will wrap the steel cable around the outer wall, vertically pull up the gravity energy storage pack 1, raise the position of the gravity energy storage pack 1, and at the same time store the steel cable, providing storage and organization space for the steel cable.

[0054] Specifically, the gravity energy storage pack 1 is made of elastic material, which facilitates the volume change of the gravity energy storage pack 1. The outer surface of the gravity energy storage pack 1 is provided with a waterproof and anti-corrosion coating. Commonly used materials for the waterproof and anti-corrosion coating include epoxy coating, silicone coating, polyurethane coating, acrylic coating, and fluorocarbon coating, which reduce the corrosion of the gravity energy storage pack 1 by seawater or lake water and further improve the service life of the gravity energy storage pack 1.

[0055] Correspondingly, the aforementioned auxiliary drive device 3 can be an energy storage motor. The energy storage motor is connected to the drive shaft of the reversible motor 2 via gears. That is, in the energy storage mode, the drive shaft of the reversible motor 2 drives the gravity energy storage bag 1 to move upward through rollers to store gravitational potential energy. At the same time, it also drives the energy storage motor through gears to recover electrical energy, thereby improving the overall energy storage efficiency of the device in this application.

[0056] Specifically, in this application, the power receiving end of the reversible motor 2 is connected to a photovoltaic power generation system and / or a wind power generation system, and the power output end of the reversible motor 2 is connected to a household load and / or a public power grid.

[0057] Meanwhile, a wind power generation device can be installed at the air inlet of the self-feedback air compressor 4. During the air discharge process of the gravity energy storage pack 1, the speed of gas outflow from the gravity energy storage pack 1 is controlled by the air valve 5. The wind power drives the wind power generation device, thereby realizing the energy recovery of the gas flowing out of the gravity energy storage pack 1.

[0058] In actual use, taking the device of this application as an example of being installed on the sea surface, the reversible motor 2, auxiliary drive device 3, self-feedback air compressor 4, and controller are all installed on the mounting frame on the sea surface, and the gravity energy storage pack 1 is suspended above the sea surface or placed below the sea surface.

[0059] Here, we will further illustrate the example of gravity energy storage pack 1 being positioned below sea level. When a stable power supply is needed for residential loads and / or the public power grid, the controller, based on the rated power output obtained from the reversible motor 2, initiates the sinking motion of gravity energy storage pack 1 and simultaneously activates the auxiliary drive device 3. The sinking process of gravity energy storage pack 1 can be divided into three stages.

[0060] Phase 1:

[0061] Gravity energy storage pack 1 has just begun to sink, with an initial velocity of 0. It is subject to its own weight, buoyancy, and resistance from the seawater in the opposite direction of motion. During this phase, the gravitational potential energy output power of gravity energy storage pack 1 is less than the rated electrical energy output power of reversible motor 2, i.e., P... 重 <P 电 Therefore, the difference between the electrical energy required by the reversible motor 2 and the gravitational potential energy output by the gravity energy storage pack 1 is provided by the auxiliary drive device 3. The auxiliary drive device 3 assists the gravity energy storage pack 1 in driving the transmission shaft of the reversible motor 2 to rotate, so that the speed of the transmission shaft of the reversible motor 2 reaches the rated speed corresponding to the rated electrical energy output power.

[0062] Phase Two:

[0063] After gravity energy storage package 1 begins its sinking motion, the gravity energy storage package 1 experiences a force greater than its own weight and the sum of the buoyancy and the resistance provided by the seawater, i.e.: F 浮 +F 阻 < M*g, therefore, the gravity storage pack 1 has a downward acceleration, and its sinking speed will gradually increase; correspondingly, the resistance F it experiences when moving in seawater... 阻 The acceleration of the gravity storage package 1 moving vertically downwards will gradually decrease, but before the acceleration of the gravity storage package 1 moving vertically downwards decreases to zero, the sinking speed of the gravity storage package 1 will continue to increase until the gravitational potential energy output power P of the gravity storage package 1 during its sinking motion. 重 The electrical energy output power P of the reversible motor 2 电 To achieve consistency, i.e., P 重 =M*g*V=P 电 During this process, the controller synchronously adjusts the auxiliary drive device 3, reducing the force exerted by the auxiliary drive device 3 on the transmission shaft of the reversible motor 2, thereby increasing the gravitational potential energy output power P during the sinking motion of the gravity energy storage bag 1.重 The sum of the output power of the auxiliary drive device 3 and the electrical energy output power P of the reversible motor 2 电 Maintain the same consistency until the auxiliary drive unit 3 is turned off.

[0064] Phase Three:

[0065] The sinking speed of gravity energy storage package 1 will continuously increase, causing the gravitational potential energy output power P of gravity energy storage package 1 during its sinking motion to increase. 重 The electrical energy output power P of the reversible motor 2 电 To achieve consistency, i.e., P 重 =P 电 The controller shuts down the auxiliary drive device 3, and in order to maintain a stable sinking speed of the gravity energy storage pack 1 and reduce its acceleration to zero, the controller controls the self-feedback air compressor 4 to supply gas to the inside of the gravity energy storage pack 1. This increases the overall volume and cross-sectional area of ​​the gravity energy storage pack 1, thereby increasing the drag and buoyancy it experiences in seawater. This results in: F 浮 +F 阻 =M*g.

[0066] At this time, the gravity energy storage pack 1 descends at its rated speed, synchronously driving the drive shaft of the reversible motor 2 to rotate at its rated speed, so that the reversible motor 2 maintains a stable power output to meet the needs of household loads and / or public power grids.

[0067] During the ascent of gravity energy storage pack 1, the controller controls the self-feedback air compressor 4 to expel the gas inside gravity energy storage pack 1, ensuring that all the gas inside the self-feedback air compressor 4 is expelled, leaving only the load block inside gravity energy storage pack 1. The power receiving end of the reversible motor 2 is connected to a photovoltaic power generation system and / or a wind power generation system. The reversible motor 2 uses the received power to drive the drive shaft to rotate, thereby causing gravity energy storage pack 1 to rise from the deep sea, realizing the re-storage of gravitational potential energy in gravity energy storage pack 1.

[0068] Furthermore, the internal system of the controller in this application can directly adopt an Energy Management System (EMS). An Energy Management System (EMS) is an intelligent system that integrates hardware and software to monitor, control, and optimize energy flow and energy consumption in an energy system. It can directly obtain parameters such as the sinking depth, sinking speed, and time required to reach the sinking speed of the gravity energy storage package 1 according to the needs of household loads and / or public power grids.

[0069] Although the present invention 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; and these 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 the present invention.

Claims

1. A method of energy release of a flexible controllable gravitational energy storage device, characterized in that, The method comprises the following steps: The controller obtains the rated electric energy output power of the reversible motor (2); According to the released gravitational potential energy output power of the gravitational energy storage package (1) in the sinking movement in the liquid medium, the size of the gravitational potential energy output power and the rated electric energy output power is determined; When the gravitational potential energy output power is less than the rated electric energy output power, the auxiliary driving device (3) is started to jointly drive the transmission shaft of the reversible motor (2) to obtain a stable rated rotating speed, so that the reversible motor (2) obtains a stable rated electric energy output power; When the gravitational potential energy output power of the gravitational energy storage package (1) in the sinking movement is greater than or equal to the electric energy output power of the reversible motor (2), the controller starts the self-feedback air compressor (4) to adjust the air amount in the inner cavity of the gravitational energy storage package (1) and closes the auxiliary driving device (3), so as to maintain the gravitational potential energy output power consistent with the electric energy output power of the reversible motor (2), so that the reversible motor (2) performs stable rated electric energy output.

2. The method of releasing energy from a flexible controllable gravitational energy storage device according to claim 1, wherein, The controller is also used to obtain the weight, volume and sinking movement speed of the gravitational energy storage package (1); The gravitational potential energy output power of the gravitational energy storage package (1) is the product of the weight and the sinking movement speed.

3. The method of releasing energy from a flexible controllable gravitational energy storage device of claim 1, wherein, The controller is also used to obtain the density of the liquid medium and the resistance coefficient of the liquid medium, and calculate the buoyancy and the movement resistance suffered by the gravitational energy storage package (1); When the gravitational potential energy output power is consistent with the electric energy output power of the reversible motor (2), the sum of the movement resistance and the buoyancy suffered by the gravitational energy storage package (1) in the sinking movement in the liquid medium is the same as the gravity.

4. A flexible controllable gravitational energy storage device, applied to the environment of liquid medium, characterized in that, It comprises: a gravitational energy storage package (1), a reversible motor (2), an auxiliary driving device (3), a self-feedback air compressor (4) and a controller; The transmission shaft of the reversible motor (2) is in transmission connection with the auxiliary driving device (3) and the gravitational energy storage package (1), so as to realize energy conversion among the reversible motor (2), the auxiliary driving device (3) and the gravitational energy storage package (1); The output end of the self-feedback air compressor (4) is in communication with the inner cavity of the gravitational energy storage package (1) through a pipeline, so as to regulate the volume of the gravitational energy storage package (1) to change the movement speed of the gravitational energy storage package (1) in the liquid medium.

5. The flexible controllable gravitational energy storage device of claim 4, wherein, The gravitational energy storage package (1) is filled with a gravitational load, and the density of the gravitational load is greater than the density of the liquid medium.

6. The flexible controllable gravitational energy storage device of claim 4, wherein, An air valve (5) is installed on the gravitational energy storage package (1), the air valve (5) is electrically connected with the controller, and the valve port of the air valve (5) is in communication with the output end of the self-feedback air compressor (4) through a pipeline.

7. The flexible controllable gravitational energy storage device of claim 4, wherein, One end of a steel cable is connected to the upper end of the gravitational energy storage package (1), and the other end of the steel cable is in winding connection with a roller on the transmission shaft of the reversible motor (2).

8. The flexible controllable gravitational energy storage device of claim 4, wherein, The gravitational energy storage package (1) is made of an elastic material.

9. The flexible controllable gravitational energy storage device of claim 8, wherein, A waterproof and corrosion-resistant coating is arranged on the outer surface of the gravitational energy storage package (1).

10. The flexible controllable gravitational energy storage device of any of claims 4-9, wherein, The electric energy receiving end of the reversible motor (2) is connected with a photovoltaic power generation system and / or a wind power generation system, and the electric energy output end of the reversible motor (2) is electrically connected with a household load and / or a public power grid.

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