Wheel-driven carrying cable type gravity flow energy storage system and energy storage method

Abstract

The invention relates to the technical field of gravity energy storage, in particular to a wheel-driven carrying cable type gravity flow energy storage system and method. The system comprises a carrying cable type carrying subsystem, an upper storage yard, a lower storage yard and a plurality of energy storage blocks. The carrying cable type carrying subsystem comprises an energy conversion unit, a driving wheel unit, a reversing wheel unit, a plurality of energy storage block carrying units and two carrying cables; the two carrying cables are in transmission fit with the two driving wheels / reversing wheels in a one-to-one correspondence mode, and the two opposite ends of the energy storage block carrying unit are fixedly connected with the two carrying cables in a one-to-one correspondence mode; the method comprises the steps that all the energy storage blocks are continuously moved to the upper storage yard from the lower storage yard to achieve energy storage and charging, and the energy conversion unit is driven to continuously convert gravitational potential energy into electric energy to achieve energy release and discharging. The invention aims to provide a wheel-driven carrying cable type gravity flow energy storage system and an energy storage method aiming at at least one technical problem related in the background technology.

Description

Technical Field

[0001] The present application relates to the technical field of gravity energy storage, and in particular to a wheel-driven carrying rope-type gravity flow energy storage system and an energy storage method. Background Art

[0002] In recent years, the demand for electricity has maintained a steady growth trend, and the peak load characteristics have become increasingly prominent. However, the supply of coal and natural gas is tight, the prices remain high, and thermal power companies are facing difficulties in operation. In addition, the dual control of energy consumption and the uncertainty of hydropower output have led to tight power supply in some areas. Therefore, new power generation technologies such as wind power / photovoltaic power have emerged, and their proportion in energy utilization is gradually increasing. However, renewable energy dominated by wind power and photovoltaic power is characterized by randomness, volatility and intermittency. It is an unstable energy source and cannot fully meet the social electricity demand. For this reason, it is necessary to use energy storage systems to regulate the demand for power generation and electricity consumption. At present, there are many forms of energy storage, such as gravity energy storage, electrochemical energy storage, chemical energy storage, and thermal energy storage. However, electrochemical energy storage, chemical energy storage, and thermal energy storage have energy loss problems, are not suitable for long-term energy storage, and generally have safety problems; pumped storage and flywheel energy storage in gravity energy storage have high requirements for terrain and space, and are difficult to deploy widely. Therefore, gravity energy storage based on height difference for power generation has gradually attracted attention. Existing gravity energy storage systems generally use large loads to lift and lower successively to achieve energy storage and release. This means that the gravity energy storage system also has certain requirements for environmental factors such as terrain during implementation, which limits the promotion and application of gravity energy storage system technology. Summary of the invention

[0003] The purpose of the present application is to provide a wheel-driven rope-type gravity flow energy storage system and an energy storage method in view of at least one technical problem involved in the background technology.

[0004] In order to achieve the above objectives, this application adopts the following technical solutions: One aspect of the present application provides a wheel-driven carrying rope gravity flow energy storage system, comprising a carrying rope carrying subsystem, an upper stockpile, a lower stockpile and a plurality of energy storage blocks; the carrying rope carrying subsystem comprises an energy conversion unit, a driving wheel unit, a reversing wheel unit, a plurality of energy storage block carrying units and two carrying ropes; The driving wheel unit comprises two driving wheels arranged coaxially, the driving wheels are arranged vertically, the two carrying ropes are matched with the two driving wheels in a one-to-one transmission manner, the reversing wheel unit comprises two reversing wheels arranged coaxially, the reversing wheels are arranged vertically, the two carrying ropes are matched with the two reversing wheels in a one-to-one transmission manner, the axial direction of the driving wheel and the axial direction of the reversing wheel are both parallel to the first direction, and the first direction is arranged horizontally; The opposite ends of the energy storage block carrying unit are fixedly connected to the two carrying ropes one by one; the energy storage block carrying units are evenly distributed along the carrying ropes; each energy storage block carrying unit is used to circulate along a clockwise trajectory together with the carrying ropes, and each energy storage block carrying unit is also used to circulate along a counterclockwise trajectory together with the carrying ropes; the energy conversion unit is transmission-connected to the driving wheel unit to achieve energy storage by moving the energy storage blocks from the lower yard to the upper yard, and to achieve energy release by moving the energy storage blocks from the upper yard to the lower yard.

[0005] Optionally, the energy storage block carrying unit includes a carrying vehicle and an even number of rope connection assemblies installed on the carrying vehicle; the rope connection assemblies are symmetrically distributed on both sides of the carrying vehicle, and the carrying vehicle is fixedly connected to the carrying rope through at least two symmetrically arranged rope connection assemblies.

[0006] The beneficial effect of this technical solution is that compared with the detachable installation between the rope connection assembly and the rope in the existing gravity energy storage system, the rope connection assembly is fixedly connected to the carrying rope in the embodiment of the present application, which not only has a simple structure, but also does not need to frequently open and close the rope connection assembly to connect and separate the rope connection assembly and the carrying rope, thereby improving the reliability of the connection between the rope connection assembly and the carrying rope and reducing maintenance costs. At the same time, since the rope connection assembly carries a large load, at least two rope connection assemblies are arranged on both sides of the carrier vehicle, which can improve the carrying capacity of the energy storage block carrying unit on the one hand, and improve the reliability of the energy storage block carrying unit on the other hand.

[0007] Optionally, the rope connection assembly includes a fixed connection end having a jaw formed on the fixed connection end, wherein the fixed connection end partially covers the carrying rope through the jaw in the circumferential direction of the carrying rope, and the jaw is oriented perpendicular to the extension direction of the carrying rope.

[0008] The beneficial effect of this technical solution is that: in this way, the carrying rope is partially covered by the fixed connecting end at the position where the rope connecting assembly is provided, so that the part of the carrying rope not covered by the fixed connecting end can make pressure contact with the periphery of the driving wheel unit when passing through the driving wheel unit, and can make pressure contact with the periphery of the reversing wheel unit when passing through the reversing wheel unit, so that when the rope connecting assembly is reliably connected to the carrying rope, the arrangement of the rope connecting assembly is not easy to hinder the pressure contact between the carrying rope and both the driving wheel unit and the reversing wheel unit.

[0009] Optionally, the carrier vehicle includes a vehicle body and an energy storage block connector, the energy storage block connector and the rope connection assembly are both installed on the vehicle body, and the energy storage block connector is detachably connected to the energy storage block.

[0010] The beneficial effect of this technical solution is that it can further realize loading and unloading of energy storage blocks on the carrier vehicle.

[0011] Optionally, the vehicle body includes a hanger shaft and two mounting plates arranged perpendicular to the hanger shaft, the axial direction of the hanger shaft is parallel to the first direction, the two mounting plates are pivoted to the two ends of the hanger shaft one by one, the mounting plates are fixed with the rope connection assembly of the carrier vehicle in the first direction, and the energy storage block connector is installed on the hanger shaft.

[0012] The beneficial effect of the technical solution is that: in this way, the mounting plate can be pivoted relative to the energy storage block connector installed on the hanger shaft. When the energy storage block connector is fixed with an energy storage block, the mounting plate can also pivot relative to the energy storage block. When the carrier moves to the driving wheel unit or the reversing wheel unit, the mounting plate flips along the outer periphery of the driving wheel unit or the reversing wheel unit. Since the mounting plate can pivot relative to the energy storage block connector, the energy storage block connector does not flip under the action of gravity when the mounting plate flips. When the energy storage block connector is loaded with an energy storage block, the energy storage block does not flip with the mounting plate. When the carrier passes through the driving wheel unit and the reversing wheel unit, the energy storage block connector and the energy storage block do not need to do a large-scale flipping and reversing movement, thereby reducing the impact of the energy storage block connector and the energy storage block on the carrying rope-type carrying subsystem when the energy storage block is reversed, reducing the damage to the carrying rope-type carrying subsystem, and improving the safety, stability and reliability of the operation of the gravity flow energy storage system.

[0013] Optionally, the rope connection assemblies located on the same side of the vehicle body in the first direction are arranged along the extension direction of the carrying rope.

[0014] Optionally, a first matching groove is provided on the outer periphery of the driving wheel, and the first matching groove extends along the circumference of the driving wheel; a second matching groove is provided on the outer periphery of the reversing wheel, and the second matching groove extends along the circumference of the reversing wheel; the first matching groove and the second matching groove both match with the carrying rope, and pads made of friction material are provided in the first matching groove and the second matching groove, and the pads are in pressure contact with the carrying rope.

[0015] The beneficial effect of this technical solution is that the carrying rope can be effectively limited by the first matching groove and the second matching groove, so that the carrying rope is not easy to slip off the first matching groove and the second matching groove, and the pressure contact between the pad and the carrying rope can improve the ability to transmit power between the driving wheel, the carrying rope and the reversing wheel, so that the driving wheel and the reversing wheel are not easy to slip with the carrying rope.

[0016] Optionally, the energy conversion unit is used to drive the two driving wheels to rotate synchronously, or the energy conversion unit is used to drive the two driving wheels to rotate separately.

[0017] The beneficial effect of this technical solution is that: in this way, the energy conversion unit can drive the two driving wheels to rotate, thereby driving the two carrying ropes and the two reversing wheels to rotate. In the embodiment of the present application, the two driving wheels can be driven synchronously by the energy conversion unit, or the two driving wheels can be driven to rotate separately by the energy conversion unit. The energy conversion unit described in the embodiment of the present application drives the two driving wheels to rotate separately, including that the energy conversion unit drives the two driving wheels to rotate separately, and then makes the two driving wheels rotate synchronously. At this time, the synchronization of the two driving wheels can be achieved by electrical control and other methods.

[0018] Optionally, the energy conversion unit includes an electric motor and a generator both of which are transmission-connected to the drive wheel unit; or, the energy conversion unit is an electric generator.

[0019] The beneficial effect of this technical solution is that: in this way, during the energy storage charging process, the electric motor is driven by electric energy to operate, and the energy storage block carrier unit carrying the energy storage block is driven to move from bottom to top through the driving wheel unit, the reversing wheel unit and the carrying rope; during energy release and discharge, the energy storage block carrier unit carrying the energy storage block moves from top to bottom due to gravity, and at the same time, the driving wheel unit drives the generator to generate electricity, thereby realizing the conversion of gravitational potential energy into electrical energy. During the energy storage charging process, the electric generator is driven by electric energy to operate, and the energy storage block carrier unit carrying the energy storage block is driven to move from bottom to top through the driving wheel unit, the reversing wheel unit and the carrying rope; during energy release and discharge, the energy storage block carrier unit carrying the energy storage block moves from top to bottom due to gravity, and at the same time, the driving wheel unit drives the electric generator to rotate in the opposite direction, thereby realizing the conversion of gravitational potential energy into electrical energy.

[0020] Optionally, the wheel-driven carrying rope gravity flow energy storage system provided in the present application includes a plurality of the carrying rope carrying subsystems, and each of the carrying rope carrying subsystems is arranged transversely, or each of the carrying rope carrying subsystems is arranged longitudinally.

[0021] Another aspect of the present application provides an energy storage method, which is applied to the wheel-driven carrying rope gravity flow energy storage system provided in the present application, and the method comprises: In the energy storage charging stage, the energy conversion unit drives the two driving wheels in the driving wheel unit to rotate, and the two driving wheels drive the two carrying ropes and the two reversing wheels in the reversing wheel unit to rotate, thereby driving each energy storage block carrying unit to move, so as to continuously move each energy storage block from the lower yard to the upper yard; During the energy release and discharge stage, the energy storage blocks on the upper yard are loaded on the energy storage block carrying units in turn, and continuously move from the upper yard to the lower yard under the action of gravity, thereby driving the carrying rope and the driving wheel in the driving wheel unit to rotate, so as to drive the energy conversion unit to continuously convert gravitational potential energy into electrical energy.

[0022] Optionally, the method includes: the energy storage block may correspond to the energy storage block carrying unit, or may correspond to the energy storage block carrying unit at intervals, and the travel speed of the energy storage block carrying unit following the carrying rope is adjustable, thereby realizing the adjustable gravity flow.

[0023] The beneficial effect of this technical solution is that it can further realize the functions of "slow charging and fast discharging" or "charging and discharging on demand", so that the wheel-driven rope-type gravity flow energy storage system and energy storage method provided in this application can be applied to more scenarios, and thus be better promoted and applied.

[0024] The technical solution provided by this application can achieve at least one of the following beneficial effects: The wheel-driven carrying rope type gravity flow energy storage system and energy storage method provided in the present application use two carrying ropes to jointly carry and tow the energy storage block carrying unit equipped with the energy storage block, which has a stronger carrying capacity than the existing gravity energy storage system that uses only one carrying rope to carry and tow the energy storage block. In this way, according to the geographical environment of the construction site, the number of supporting structures (such as columns, etc.) arranged between the upper yard and the lower yard can be appropriately reduced, and there is even no need to arrange supporting structures between the upper yard and the lower yard, thereby reducing the requirements for the terrain environment for implementing the gravity flow energy storage system, improving the adaptability of the gravity flow energy storage system to the geographical environment, and making the gravity flow energy storage system easier to promote and apply; and, compared with the traditional gravity energy storage system, the rollers used as driving parts and reversing parts are arranged horizontally, and the roller axial direction is arranged vertically. In the present application, the axial direction of the driving wheel unit and the axial direction of the reversing wheel unit are both arranged horizontally, thereby realizing a horizontal layout and saving the plane space requirement.

[0025] The additional technical features and advantages of the present application will be more clearly explained in the following description, or can be understood through the specific practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the specific implementation methods of the present application, the following is a brief introduction to the drawings required for the description of the specific implementation methods. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1A partial structural schematic diagram of an implementation of a wheel-driven carrying rope gravity flow energy storage system provided in an embodiment of the present application; Figure 2 A schematic diagram of the structure of an embodiment of a driving wheel unit provided in an embodiment of the present application and an energy conversion unit; Figure 3 A partial structural schematic diagram of an implementation manner of a carrying rope carrying subsystem provided in an embodiment of the present application; Figure 4 A schematic structural diagram of an implementation of an energy storage block carrier unit loaded with energy storage blocks provided in an embodiment of the present application; Figure 5 A schematic structural diagram of an implementation scheme of a rope connection assembly provided in an embodiment of the present application.

[0028] Reference numerals: 01. Reversing wheel unit; 02. Rope guide unit; 03. Carrying rope; 04. Energy storage block; 05. Energy storage block carrier unit; 06. Driving wheel unit; 07. Energy conversion unit; 08. Driving wheel; 09. First connecting shaft; 10. First matching groove; 11. Hanger shaft; 12. Rope connection assembly; 13. Mounting plate; 14. Energy storage block connector; 15. Fixed connection end; 16. Jaw; 17. Support seat; 18. Reversing wheel; 19. Second connecting shaft; 20. Second matching groove. DETAILED DESCRIPTION

[0029] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0030] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0031] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0032] At present, remote areas such as mountainous or hilly areas are usually areas where electricity supply is generally tight and gravity energy storage systems are more needed. However, these areas often have complex terrain and steep slopes, which are not convenient for the implementation and promotion of large-scale systems. At the same time, in order to support large weight loads, existing gravity energy storage systems often need to arrange more support structures on the load route to provide effective support for the load. In mountainous or hilly areas, on steep slopes or in rugged and complex terrain, it is usually difficult to construct these support structures and is not easy to implement, which limits the promotion and application of gravity energy storage system technology.

[0033] like Figures 1 to 5 As shown, one aspect of the present application provides a wheel-driven carrying rope gravity flow energy storage system including a carrying rope carrying subsystem, an upper stockpile, a lower stockpile and a plurality of energy storage blocks 04; the carrying rope carrying subsystem includes an energy conversion unit 07, a driving wheel unit 06, a reversing wheel unit 01, a plurality of energy storage block carrying units 05 and two carrying ropes 03; The driving wheel unit 06 includes two driving wheels 08 arranged coaxially, the driving wheels 08 are arranged vertically, the two carrying ropes 03 are matched with the two driving wheels 08 in a one-to-one transmission manner, the reversing wheel unit 01 includes two reversing wheels 18 arranged coaxially, the reversing wheels 18 are arranged vertically, the two carrying ropes 03 are matched with the two reversing wheels 18 in a one-to-one transmission manner, the axial direction of the driving wheel 08 and the axial direction of the reversing wheel 18 are both parallel to the first direction, and the first direction is arranged horizontally; The opposite ends of the energy storage block carrying unit 05 are fixedly connected to the two carrying ropes 03 in a one-to-one correspondence; each of the energy storage block carrying units 05 is evenly distributed along the carrying rope 03; each of the energy storage block carrying units 05 is used to move in a clockwise trajectory together with the carrying rope 03, and each of the energy storage block carrying units 05 is also used to move in a counterclockwise trajectory together with the carrying rope 03; the energy conversion unit 07 is transmission-connected to the driving wheel unit 06, so as to realize energy storage by moving the energy storage block 04 from the lower yard to the upper yard, and to realize energy release by moving the energy storage block 04 from the upper yard to the lower yard.

[0034] In the embodiment of the present application, the clockwise and counterclockwise observation angles should be the same, and according to the different settings of the carrying rope-type carrying subsystem, the clockwise and corresponding counterclockwise positions should generally be different. The clockwise and counterclockwise represent the moving direction, and the corresponding moving trajectory can be similar to the edge shape of the waist-shaped hole, a circle or an ellipse; the number of the energy storage block carrying units 05 is at least two. In the embodiment of the present application, preferably, the driving wheel unit 06 is arranged above the reversing wheel unit 01. Of course, the driving wheel unit 06 can also be arranged below the reversing wheel unit 01.

[0035] It can be understood that in the embodiment of the present application, the two driving wheels 08 are arranged in mirror symmetry, and the two reversing wheels 18 are arranged in mirror symmetry; the carrying rope 03 provided in the embodiment of the present application has both the function of towing heavy objects and the function of carrying heavy objects.

[0036] The wheel-driven carrying rope type gravity flow energy storage system provided in the present application adopts two carrying ropes 03 to jointly carry and tow the energy storage block carrying unit 05 equipped with the energy storage block 04. Compared with the existing gravity energy storage system that only adopts one carrying rope 03 to carry and tow the energy storage block 04, the carrying capacity is stronger. In this way, according to the geographical environment of the construction site, the number of supporting structures (such as columns, etc.) arranged between the upper yard and the lower yard can be appropriately reduced, and even no supporting structure is required to be arranged between the upper yard and the lower yard, thereby reducing the requirements for the terrain environment of the implementation of the gravity flow energy storage system, improving the adaptability of the gravity flow energy storage system to the geographical environment, and making the gravity flow energy storage system easier to promote and apply; at the same time, the existing gravity energy storage system is specially provided with a carrying device (such as a carrying track or a carrying rope, etc.) independent of the traction rope to carry the energy storage block carrying unit 05 and the energy storage block 04. The carrying device often has a large weight and requires additional supporting structures for support, which also forms certain restrictions on the promotion and application of the gravity energy storage system in mountainous areas, hills or other complex terrains. The wheel-driven carrying rope type gravity flow energy storage system provided by the present application adopts a double carrying rope 03 to realize both the carrying of the energy storage block carrying unit 05 and the energy storage block 04 and the traction of the energy storage block carrying unit 05 and the energy storage block 04. There is no need to specially set up a carrying device independent of the traction rope, thereby reducing the number of required support structures, and even no need to set up a support structure. The structure is simpler, the convenience of construction is improved, and the requirements for the terrain environment in the implementation of the gravity flow energy storage system are further reduced. The adaptability of the gravity flow energy storage system to the geographical environment is improved, making the gravity flow energy storage system easier to promote and apply; and the existing gravity energy storage system that uses a single carrying rope 03 to transport the energy storage block 04 has poor stability, and the energy storage block 04 is prone to swaying during driving. In particular, the wind force and wind speed are usually large in mountainous areas, hilly areas and other relatively open areas, which aggravates the degree of swaying of the energy storage block 04 during movement, posing a greater safety hazard.The wheel-driven carrying rope type gravity flow energy storage system provided by the present application connects the two ends of the energy storage block carrying unit 05 to the two carrying ropes 03 in a one-to-one correspondence. The two carrying ropes 03 can provide torque for the energy storage block carrying unit 05 to resist swinging and shaking, thereby reducing the degree of swinging and shaking of the energy storage block carrying unit 05 (regardless of whether it is loaded with energy storage blocks 04). When applied to mountainous areas, hilly areas and other wide areas with high wind speed, it can operate more stably and has less potential safety hazards. Moreover, the wheel-driven carrying rope type gravity flow energy storage system provided by the present application connects the two ends of the energy storage block carrying unit 05 to the two carrying ropes 03 in a one-to-one correspondence. Compared with the existing gravity energy storage system that uses a single carrying rope 03 to transport energy storage blocks 04, it reduces the load strength of the single carrying rope 03, effectively avoids the risk of single-point overload on the carrying rope 03, and improves the safety margin of system operation. The wheel-driven carrying rope type gravity flow energy storage system provided by the present application The dynamic carrying rope gravity flow energy storage system connects the two ends of the energy storage block carrying unit 05 to the two carrying ropes 03 one by one, which improves the maximum carrying capacity compared to the existing gravity energy storage system that uses a single carrying rope 03 to transport the energy storage block 04, thereby enabling the energy storage and power generation states to operate efficiently, and realizing high-power storage and release of electric energy; at the same time, since each energy storage block carrying unit 05 can circulate together with the carrying rope 03, each energy storage block carrying unit 05 can continuously transport the energy storage block 04, thereby forming a continuous gravity flow, providing conditions for forming a stable energy flow and continuous discharge; and, compared to the traditional gravity energy storage system, the rollers serving as the driving member and the reversing member are horizontally arranged, and the axial direction of the rollers is vertically arranged. In the embodiment of the present application, the axial direction of the driving wheel unit 06 and the axial direction of the reversing wheel unit 01 are both horizontally arranged, thereby realizing a horizontal layout and saving the plane space requirement.

[0037] like Figure 4As shown, optionally, the energy storage block carrying unit 05 includes a carrying vehicle and an even number of rope connection assemblies 12 installed on the carrying vehicle; each rope connection assembly 12 is symmetrically distributed on both sides of the carrying vehicle, and the carrying vehicle is fixedly connected to the carrying rope 03 through at least two symmetrically arranged rope connection assemblies 12. Compared with the detachable installation between the rope connection assembly 12 and the rope in the existing gravity energy storage system, the rope connection assembly 12 is fixedly connected to the carrying rope 03 in the embodiment of the present application, which is not only simple in structure, but also does not need to frequently open and close the rope connection assembly 12 to connect and separate the rope connection assembly 12 and the carrying rope 03, thereby improving the reliability of the connection between the rope connection assembly 12 and the carrying rope 03 and reducing the maintenance cost; at the same time, since the rope connection assembly 12 carries a large load, at least two rope connection assemblies 12 are arranged on both sides of the carrying vehicle, which can improve the carrying capacity of the energy storage block carrying unit 05 on the one hand, and improve the reliability of the energy storage block carrying unit 05 on the other hand. Of course, at least two rope connection assemblies 12 may be provided on one side of the carrier, and one rope connection assembly 12 may be provided on the other side of the carrier, or only one rope connection assembly 12 may be provided on both sides of the carrier.

[0038] like Figure 5 As shown, optionally, the rope connection assembly 12 includes a fixed connection end 15, on which a jaw 16 is formed, and in the circumferential direction of the carrying rope 03, the fixed connection end 15 partially covers the carrying rope 03 through the jaw 16, and the direction of the jaw 16 is perpendicular to the extension direction of the carrying rope 03. In this way, the carrying rope 03 is partially covered by the fixed connection end 15 at the position where the rope connection assembly 12 is arranged, so that the part of the carrying rope 03 not covered by the fixed connection end 15 can be in pressure contact with the outer periphery of the driving wheel unit 06 when passing through the driving wheel unit 06, and can be in pressure contact with the outer periphery of the reversing wheel unit 01 when passing through the reversing wheel unit 01, so that when the rope connection assembly 12 is reliably connected to the carrying rope 03, the arrangement of the rope connection assembly 12 is not easy to hinder the pressure contact between the carrying rope 03 and the driving wheel unit 06 and the reversing wheel unit 01. Of course, the fixed connection end 15 can also cover the carrying rope 03 at the corresponding position 360°, or the rope connection component 12 and the carrying rope 03 can be installed in a detachable manner.

[0039] Optionally, the carrier vehicle includes a vehicle body and an energy storage block connector 14, the energy storage block connector 14 and the rope connection assembly 12 are both mounted on the vehicle body, and the energy storage block connector 14 is detachably connected to the energy storage block 04. Thus, the energy storage block 04 can be loaded and unloaded on the carrier vehicle.

[0040] Optionally, the vehicle body includes a hanger shaft 11 and two mounting plates 13 arranged perpendicular to the hanger shaft 11, the axial direction of the hanger shaft 11 is parallel to the first direction, the two mounting plates 13 are pivotally connected to the two ends of the hanger shaft 11 in a one-to-one correspondence, the mounting plates 13 are fixed with the rope connection assembly 12 of the carrier vehicle in the first direction, and the energy storage block connector 14 is installed on the hanger shaft 11. In this way, the mounting plate 13 can pivot relative to the energy storage block connector 14 installed on the hanger shaft 11; when the energy storage block 04 is fixed on the energy storage block connector 14, the mounting plate 13 can also pivot relative to the energy storage block 04, and when the carrier vehicle moves to the driving wheel unit 06 or the reversing wheel unit 01, the mounting plate 13 flips along the outer periphery of the driving wheel unit 06 or the reversing wheel unit 01. Since the mounting plate 13 can pivot relative to the energy storage block connector 14, the energy storage block connector 14 does not perform flipping motion under the action of gravity when the mounting plate 13 flips over; when the energy storage block connector 14 carries the energy storage block 04, the energy storage block 04 does not flip over with the mounting plate 13. When the carrier passes through the driving wheel unit 06 and the reversing wheel unit 01, the energy storage block connector 14 and the energy storage block 04 do not need to perform a large-scale flipping and reversing motion, thereby reducing the impact of the energy storage block connector 14 and the energy storage block 04 on the carrying rope-type carrying subsystem when the energy storage block connector 14 and the energy storage block 04 are reversed, reducing the damage to the carrying rope-type carrying subsystem, and improving the safety, stability and reliability of the operation of the gravity flow energy storage system. In the embodiment of the present application, the energy storage block connector 14 can be fixedly connected to the hanger shaft 11, and the energy storage block connector 14 can also be pivoted to the hanger shaft 11; the mounting plate 13 is preferably arranged perpendicular to the hanger shaft 11.

[0041] Optionally, the rope connection assemblies 12 located on the same side of the vehicle body in the first direction are arranged along the extension direction of the carrying rope 03. In other words, the rope connection assemblies 12 located on the same side are arranged along the extension direction of the carrying rope 03 on the corresponding side. Of course, more than three rope connection assemblies 12 may be provided on each side of the vehicle body in the first direction, and the rope connection assemblies 12 may also be arranged in a wave-like manner.

[0042] like Figure 2 and Figure 3As shown, optionally, a first matching groove 10 is provided on the periphery of the driving wheel 08, and the first matching groove 10 extends along the circumference of the driving wheel 08; a second matching groove 20 is provided on the periphery of the reversing wheel 18, and the second matching groove 20 extends along the circumference of the reversing wheel 18; the first matching groove 10 and the second matching groove 20 are both matched with the carrying rope 03, and pads made of friction materials are provided in the first matching groove 10 and the second matching groove 20, and the pads are in pressure contact with the carrying rope 03. The first matching groove 10 and the second matching groove 20 can effectively limit the carrying rope 03, so that the carrying rope 03 is not easy to slip off the first matching groove 10 and the second matching groove 20, and the pressure contact between the pad and the carrying rope 03 can improve the ability to transmit power between the driving wheel 08, the carrying rope 03 and the reversing wheel 18, so that the driving wheel 08 and the reversing wheel 18 are not easy to slip with the carrying rope 03.

[0043] Optionally, the energy conversion unit 07 is used to drive the two driving wheels 08 to rotate synchronously, or the energy conversion unit 07 is used to drive the two driving wheels 08 to rotate separately. In this way, the energy conversion unit 07 can drive the two driving wheels 08 to rotate, thereby driving the two carrying ropes 03 and the two reversing wheels 18 to rotate. In the embodiment of the present application, the two driving wheels 08 can be driven synchronously by the energy conversion unit 07, or the two driving wheels 08 can be driven to rotate separately by the energy conversion unit 07. The energy conversion unit 07 described in the embodiment of the present application drives the two driving wheels 08 to rotate separately, including that the energy conversion unit 07 drives the two driving wheels 08 to rotate separately, and then makes the two driving wheels 08 rotate synchronously. At this time, the synchronization of the two driving wheels 08 can be achieved by electrical control and other methods. Preferably, the two driving wheels 08 are connected by a first connecting shaft 09, and the two reversing wheels 18 are connected by a second connecting shaft 19.

[0044] Optionally, the energy conversion unit 07 includes an electric motor and a generator, both of which are connected to the driving wheel unit 06. In this way, during the energy storage charging process, the electric motor is driven by electric energy to move from bottom to top through the driving wheel unit, the reversing wheel unit and the carrying rope; during energy release and discharge, the energy storage block carrying unit 05 carrying the energy storage block 04 moves from top to bottom due to gravity. At the same time, the driving wheel unit drives the generator to generate electricity, realizing the conversion of gravitational potential energy into electric energy; or, the energy conversion unit 07 is an electric generator. In this way, during the energy storage charging process, the electric generator is driven by electric energy to move from bottom to top through the driving wheel unit, the reversing wheel unit and the carrying rope; during energy release and discharge, the energy storage block carrying unit 05 carrying the energy storage block 04 moves from top to bottom due to gravity, and at the same time, the driving wheel unit drives the generator to rotate in the opposite direction, realizing the conversion of gravitational potential energy into electric energy.

[0045] Optionally, the wheel-driven carrying rope gravity flow energy storage system provided in the embodiment of the present application includes a plurality of the carrying rope carrying subsystems, each of which is arranged transversely, or each of which is arranged longitudinally. The carrying rope carrying subsystem provided in the present application also includes a rope guiding unit 02, which is arranged near the corresponding upper yard and lower yard. The extending direction of the carrying rope 03 at the rope guiding unit 02 changes from inclined extension to horizontal extension or approximately horizontal extension.

[0046] The driving wheel unit 06 and the reversing wheel unit 01 also include structures such as a support seat 17.

[0047] Another aspect of the present application provides an energy storage method, which is applied to the wheel-driven carrying rope gravity flow energy storage system provided in the embodiment of the present application, and the method comprises: In the energy storage charging stage, the energy conversion unit 07 drives the two driving wheels 08 in the driving wheel unit 06 to rotate, and the two driving wheels 08 drive the two carrying ropes 03 and the two reversing wheels 18 in the reversing wheel unit 01 to rotate, thereby driving each energy storage block carrying unit 05 to move, so as to continuously move each energy storage block 04 from the lower yard to the upper yard; During the energy release and discharge stage, each of the energy storage blocks 04 on the upper yard is sequentially loaded onto each of the energy storage block carrying units 05, and continuously moves from the upper yard to the lower yard under the action of gravity, thereby driving the carrying rope 03 and the two driving wheels 08 in the driving wheel unit 06 to rotate, so as to drive the energy conversion unit 07 to continuously convert gravitational potential energy into electrical energy.

[0048] Specifically, in one embodiment of the present application, the power storage stage: During the power storage process, the energy conversion unit 07 plays a core role in energy conversion. It draws electrical energy from the power grid and converts it into kinetic energy. The kinetic energy is then smoothly transferred to the drive wheel 08, driving it to rotate in a clockwise direction. The drive wheel 08 drives the carrying rope 03 to start moving by virtue of the friction between its surface and the carrying rope 03. This movement is then transmitted to the reversing wheel 18, which also causes it to rotate in a clockwise direction. As the carrying rope 03 continues to move, the carrier clamped thereon is pulled forward. The carrier is equipped with a hanger shaft 11 and an energy storage block connector 14, which hoist the energy storage block 04 located in the lower yard so that it moves with the carrier. When approaching the upper yard, the energy storage block 04 is disengaged from the hanger shaft 11 and the energy storage block connector 14 on the carrier, and the energy storage block 04 is sent to the upper yard and quickly transported away by the transfer vehicle for storage. The carrier vehicle continues to move along the carrier cable 03, preparing to start a new round of energy storage block 04 transportation mission.

[0049] Discharge phase: During the discharge process, the energy storage block 04 located in the upper stockyard is brought into the carrying rope 03 by the transfer vehicle. Here, the energy storage block 04 is fixed by the energy storage block connector 14 on the carrier. Subsequently, under the action of gravity, the energy storage block 04 slides down along the carrying rope 03 with the carrier, releasing the contained energy. The carrier drives the carrying rope 03 to start moving through its clamping force. The carrying rope 03 transmits the movement to the drive wheel 08 and the reversing wheel 18 through its friction force, driving them to rotate in a counterclockwise direction. The rotation of the drive wheel 08 is then transmitted to the energy conversion unit 07. The energy conversion unit 07 enters the power generation mode, converts kinetic energy into electrical energy, and inputs it into the power grid. When approaching the lower stockyard, the energy storage block 04 is disconnected from the energy storage block connector 14 on the carrier, and the energy storage block 04 is sent to the lower stockyard and transported away by the transfer vehicle for storage. The carrier continues to travel along the carrying rope 03. Finally, the transporter returned to the upper yard, ready to start a new round of energy storage block 04 transportation mission.

[0050] The energy storage method provided in the present application is applied to the wheel-driven carrying rope type gravity flow energy storage system provided in the present application, and two carrying ropes 03 are used to jointly carry and tow the energy storage block carrying unit 05 equipped with the energy storage block 04. Compared with the existing gravity energy storage system that only uses one carrying rope 03 to carry and tow the energy storage block 04, the carrying capacity is stronger. In this way, according to the geographical environment of the construction site, the number of supporting structures (such as columns, etc.) arranged between the upper yard and the lower yard can be appropriately reduced, and there is even no need to arrange supporting structures between the upper yard and the lower yard, thereby reducing the requirements for the terrain environment for the implementation of the gravity flow energy storage system, improving the adaptability of the gravity flow energy storage system to the geographical environment, and making the gravity flow energy storage system easier to promote and apply.

[0051] Optionally, the method includes: the energy storage block 04 can correspond to the energy storage block carrying unit 05, or can correspond to the energy storage block carrying unit 05 at intervals, and the travel speed of the energy storage block carrying unit 05 following the carrying rope 03 is adjustable, thereby realizing the adjustable gravity flow, and then realizing the "slow charging and fast discharging" or "charging and discharging on demand" function. In this way, the wheel-driven carrying rope gravity flow energy storage system and energy storage method provided in the present application can be applicable to more scenarios, and then more good promotion and application.

[0052] In the embodiment of the present application, an application example of a wheel-driven rope-type gravity flow energy storage system and an energy storage method is also provided, and the application example is as follows: Energy storage block 04 is mainly made of reinforced concrete with a density of 2,500 kg / m 3 The shape is a cuboid with a length of 1.2 meters, a width of 1.2 meters, and a height of 1.0 meters, and weighs 3.6 tons. Assuming that the hillside is 500 meters high, a single energy storage block 04 is lifted from the bottom of the hill to the top of the hill, and the energy that can be stored is E=mgh=3.6×103 kg×9.8 m / s 2 ×500 m=17,640,000 J=4.9 kWh. Referring to the operating speed of passenger ropeways, freight ropeways, mine hoists and other equipment, the traction rope has a speed of 6 m / s, which means it can run 21.6 km per hour. Assuming that the energy storage blocks 04 are arranged at intervals of 10 meters, 2160 energy storage blocks 04 can be transported to the top of the mountain per hour, and 2160 × 4.9 kWh / block = 10584.0 kW•h≈10.6 MWh of energy can be stored per hour. Considering factors such as system friction loss, the comprehensive power generation per hour is calculated at 85% loss: 10.6 MWh×85%≈9.0 MWh. In order to improve the power generation capacity, multiple systems can be arranged in parallel; the speed of the traction rope can also be increased.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A wheel-driven rope-type gravity flow energy storage system, characterized in that: It includes a carrying rope type carrying subsystem, an upper stockpile, a lower stockpile and a plurality of energy storage blocks; the carrying rope type carrying subsystem includes an energy conversion unit, a driving wheel unit, a reversing wheel unit, a plurality of energy storage block carrying units and two carrying ropes; The driving wheel unit comprises two driving wheels arranged coaxially, the driving wheels are arranged vertically, and the two carrying ropes are matched with the two driving wheels in a one-to-one transmission manner; the reversing wheel unit comprises two reversing wheels arranged coaxially, the reversing wheels are arranged vertically; the two carrying ropes are matched with the two reversing wheels in a one-to-one transmission manner; the axial direction of the driving wheel and the axial direction of the reversing wheel are both parallel to the first direction, and the first direction is arranged horizontally; The opposite ends of the energy storage block carrying unit are fixedly connected to the two carrying ropes one by one; the energy storage block carrying units are evenly distributed along the carrying ropes; each energy storage block carrying unit is used to circulate along a clockwise trajectory together with the carrying ropes, and each energy storage block carrying unit is also used to circulate along a counterclockwise trajectory together with the carrying ropes; the energy conversion unit is transmission-connected to the driving wheel unit to achieve energy storage by moving the energy storage blocks from the lower yard to the upper yard, and to achieve energy release by moving the energy storage blocks from the upper yard to the lower yard.

2. The wheel-driven rope-type gravity flow energy storage system according to claim 1 is characterized in that: The energy storage block carrying unit includes a carrying vehicle and an even number of rope connection assemblies installed on the carrying vehicle; the rope connection assemblies are symmetrically distributed on both sides of the carrying vehicle, and the carrying vehicle is fixedly connected to the carrying rope through at least two symmetrically arranged rope connection assemblies.

3. The wheel-driven carrying rope gravity flow energy storage system according to claim 2, characterized in that: The rope connection assembly includes a fixed connection end, on which a jaw is formed. In the circumferential direction of the carrying rope, the fixed connection end partially covers the carrying rope through the jaw, and the direction of the jaw is perpendicular to the extension direction of the carrying rope.

4. The wheel-driven carrying rope gravity flow energy storage system according to claim 2, characterized in that: The carrier vehicle comprises a vehicle body and an energy storage block connector. The energy storage block connector and the rope connection assembly are both mounted on the vehicle body. The energy storage block connector is detachably connected to the energy storage block.

5. The wheel-driven carrying rope gravity flow energy storage system according to claim 4, characterized in that: The vehicle body includes a hanger shaft and two mounting plates arranged perpendicular to the hanger shaft, the axial direction of the hanger shaft is parallel to the first direction, the two mounting plates are pivotally connected to the two ends of the hanger shaft one by one, the mounting plates are fixed with the rope connection assembly of the carrier vehicle in the first direction, and the energy storage block connector is installed on the hanger shaft.

6. The wheel-driven carrying rope gravity flow energy storage system according to claim 4, characterized in that: The rope connection assemblies located on the same side of the vehicle body in the first direction are arranged along the extending direction of the carrying rope.

7. The wheel-driven carrying rope gravity flow energy storage system according to claim 1, characterized in that: A first matching groove is arranged on the outer periphery of the driving wheel, and the first matching groove extends along the circumference of the driving wheel; a second matching groove is arranged on the outer periphery of the reversing wheel, and the second matching groove extends along the circumference of the reversing wheel; the first matching groove and the second matching groove are both matched with the carrying rope, and pads made of friction material are arranged in the first matching groove and the second matching groove, and the pads are in pressure contact with the carrying rope.

8. The wheel-driven carrying rope gravity flow energy storage system according to claim 1, characterized in that: The energy conversion unit is used to drive the two driving wheels to rotate synchronously, or the energy conversion unit is used to drive the two driving wheels to rotate separately.

9. The wheel-driven carrying rope gravity flow energy storage system according to claim 1, characterized in that: The energy conversion unit includes an electric motor and a generator both of which are transmission-connected to the drive wheel unit; or, the energy conversion unit is an electric generator.

10. The wheel-driven carrying rope gravity flow energy storage system according to any one of claims 1 to 9, characterized in that: It comprises a plurality of said carrying rope type carrying subsystems, each of said carrying rope type carrying subsystems is arranged transversely, or each of said carrying rope type carrying subsystems is arranged longitudinally.

11. An energy storage method, characterized in that: Applied to the wheel-driven carrying rope gravity flow energy storage system according to any one of claims 1 to 10, the method comprises: In the energy storage charging stage, the energy conversion unit drives the two driving wheels in the driving wheel unit to rotate, and the two driving wheels drive the two carrying ropes and the two reversing wheels in the reversing wheel unit to rotate, thereby driving each energy storage block carrying unit to move, so as to continuously move each energy storage block from the lower yard to the upper yard; During the energy release and discharge stage, the energy storage blocks on the upper yard are loaded on the energy storage block carrying units in turn, and continuously move from the upper yard to the lower yard under the action of gravity, thereby driving the carrying rope and the driving wheel in the driving wheel unit to rotate, so as to drive the energy conversion unit to continuously convert gravitational potential energy into electrical energy.

12. The energy storage method according to claim 11, characterized in that: include: The energy storage block may correspond to the energy storage block carrying unit, or may correspond to the energy storage block carrying unit at intervals. The travel speed of the energy storage block carrying unit following the carrying rope is adjustable, thereby realizing the adjustable gravity flow.

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