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

Abstract

A wheel-driven load-bearing cable type gravity flow energy storage system and energy storage method, which relate to the technical field of gravity energy storage. The wheel-driven load-bearing cable type gravity flow energy storage system includes a first steering wheel, a second steering wheel, a carrying device, an energy storage device, a driving device, a power generation device, a load-bearing cable and a traction cable; the energy storage device is detachably connected to the carrying device; the driving device drives the traction cable to operate in a first direction to transport a plurality of energy storage devices to a high altitude position, and convert electric energy into gravitational potential energy for storage; a plurality of carrying devices loaded with energy storage devices walk along the load-bearing cable and are successively transported to a low altitude position to form a continuous gravity flow to drive the power generation device to discharge continuously. This energy storage method is applicable to the wheel-driven load-bearing cable type gravity flow energy storage system. The present invention provides a wheel-driven load-bearing cable type gravity flow energy storage system and energy storage method to solve the technical problem of discontinuous charge and discharge caused by intermittent loads generated by lifting energy storage blocks one by one in the prior art.

Description

Technical Field

[0001] The present invention relates to gravity energy storage technology in the field of electric power, and more particularly, to a wheel-driven load-bearing cable type gravity flow energy storage system and an energy storage method. Background Art

[0002] In recent years, the electricity demand in China has maintained a steady growth trend, and the characteristics of peak load have become increasingly prominent. However, the supply of coal and natural gas in China is tight, and the prices remain high. Thermal power enterprises are facing difficulties in operation. Coupled with the dual control of energy consumption and the uncertainty of hydropower output, the power supply in some regions is tight. Therefore, new power generation technologies such as wind power and photovoltaic power have emerged, and their proportion in energy utilization is gradually increasing. However, renewable energy dominated by wind power and photovoltaic power has the characteristics of randomness, volatility and intermittency, which is an unstable energy source and cannot fully meet the social electricity demand. Therefore, an energy storage system must be used to regulate the demand for power generation and power consumption. Currently, there are various 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 methods have problems of energy loss, 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 be widely deployed. Therefore, gravity energy storage based on height difference for power generation has gradually attracted attention. Existing gravity energy storage systems use large loads to be lifted and lowered successively, and there are the following technical problems: the intermittent loads generated by lifting and lowering energy storage blocks one by one result in discontinuous charge and discharge. Summary of the Invention

[0003] The purpose of the present invention is to provide a wheel-driven load-bearing cable type gravity flow energy storage system and an energy storage method to solve, to a certain extent, the technical problem of discontinuous charge and discharge caused by the intermittent loads generated by lifting and lowering energy storage blocks one by one in the prior art.

[0004] To achieve the above purpose, the present invention provides the following technical solutions:

[0005] A wheel-driven load-bearing cable type gravity flow energy storage system includes a first steering wheel, a second steering wheel, a carrier device, an energy storage device, a driving device, and a power generation device, and further includes at least one pair of load-bearing cables for carrying the carrier device and at least one pair of traction cables for pulling the carrier device; the energy storage device is detachably connected to the carrier device;

[0006] Each traction cable circulates between the first steering wheel and the second steering wheel; the number of the first steering wheels, the number of the second steering wheels, and the number of the traction cables are the same; wherein the first steering wheel is located at a low altitude, and the second steering wheel is located at a high altitude opposite to the low altitude;

[0007] The driving device is connected to the first steering wheel and / or the second steering wheel to be able to drive the traction cable to run in a first direction; all the carrying devices travel under the traction of the traction cable so as to be able to successively convey a plurality of the energy storage devices along the bearing cable to a high altitude position, thereby converting electric energy into gravitational potential energy for storage;

[0008] The power generation device is connected to the first steering wheel and / or the second steering wheel; a plurality of the carrying devices loaded with the energy storage devices travel along the bearing cable to successively convey the plurality of the energy storage devices to a low altitude position and form a continuous gravity flow, while driving the first steering wheel and the second steering wheel to rotate along a second direction with the traction cable, so as to drive the power generation device to generate electricity, so as to convert the continuous gravity flow into a continuous energy flow, thereby realizing continuous power discharge; wherein, the first direction is opposite to the second direction.

[0009] In a possible implementation manner, the axial directions of both the first steering wheel and the second steering wheel are parallel to the horizontal direction.

[0010] In a possible implementation manner, all the first steering wheels are connected by a first coupling, and all the second steering wheels are connected by a second coupling;

[0011] Both the first steering wheel and the second steering wheel are provided with wheel grooves that cooperate with the traction cable;

[0012] Both the first steering wheel and the second steering wheel are connected to a bracket;

[0013] The driving device is connected to the first coupling and / or the second coupling;

[0014] The power generation device is connected to the first coupling and / or the second coupling;

[0015] The driving device and the power generation device are motor-generators, or the driving device and the power generation device are independent of each other.

[0016] In a possible implementation manner, each of the traction cables is annular; the traction cable includes a first traction cable portion, a second traction cable portion and two traction cooperation portions; the two traction cooperation portions cooperate with the first steering wheel and the second steering wheel respectively; both ends of the first traction cable portion and both ends of the second traction cable portion are respectively connected to the traction cooperation portions and form an annular shape;

[0017] Both the first traction cable portion and the second traction cable portion include two traction guiding segments and one traction inclined segment; the traction inclined segment is connected between the two traction guiding segments;

[0018] The wheel-driven cable-supported gravity flow energy storage system further includes a traction and guiding device; the traction and guiding device is provided at both the low altitude position and the high altitude position;

[0019] The traction inclined section is located between the traction and guiding device at the low altitude position and the traction and guiding device at the high altitude position.

[0020] In a possible implementation manner, the cable includes two cable fixing sections, two cable guiding sections and one cable inclined section; the cable guiding sections are connected between the cable fixing sections and the cable inclined section;

[0021] The wheel-driven cable-supported gravity flow energy storage system further includes a cable fixing device, a cable supporting device and a cable guiding device; the cable fixing device, the cable supporting device and the cable guiding device are provided at both the low altitude position and the high altitude position;

[0022] The end of each cable sequentially passes through the cable guiding device, the cable supporting device and is fixedly connected to the cable fixing device; the cable fixing section is located between the cable fixing device and the cable supporting device, the cable guiding section is located between the cable supporting device and the cable guiding device, and the cable inclined section is located between the cable guiding device at the low altitude position and the cable guiding device at the high altitude position;

[0023] The cable fixing device adopts an anchoring method;

[0024] The traction guiding section is parallel to the horizontal direction; the cable guiding section is parallel to the horizontal direction;

[0025] The first traction cable part is connected to the top of the first steering wheel, and the second traction cable part is connected to the bottom of the first steering wheel; the position of the traction guiding section of the first traction cable part corresponds to the position of the cable guiding section, and the position of the traction inclined section of the first traction cable part corresponds to the position of the cable inclined section.

[0026] In a possible implementation manner, the carrier device includes a connecting frame, a suspension frame, a walking wheel set and a rope connecting structure;

[0027] The suspension frame is rotatably connected to the connecting frame; the energy storage device is detachably connected to the suspension frame;

[0028] At least one pair of the walking wheel sets are arranged on both sides of the connecting frame; the walking wheel sets are configured to be able to walk on the cable; the number of the walking wheel sets is the same as the number of the cables;

[0029] At least one pair of the rope connection structures are rotatably connected to both sides of the connection frame; the rope connection structures are fixedly connected to the traction ropes, and there is an included angle between the rotation axis of the rope connection structures and the extension direction of the traction ropes.

[0030] In a possible implementation manner, each of the traction ropes is in a loop shape;

[0031] The rope connection structure includes a rope connection body and a clamping jaw; the clamping jaw is fixedly connected to the end of the rope connection body, and the jaws of the clamping jaw face the center line of the traction rope;

[0032] The clamping jaw is fixedly connected to the traction rope;

[0033] A carrier bearing is connected between the rope connection body and the connection frame.

[0034] In a possible implementation manner, the walking wheel set includes at least one wheel assembly; when the number of the wheel assemblies is multiple, the multiple wheel assemblies are arranged in sequence along the extension direction of the bearing cable;

[0035] The wheel assembly includes a walking wheel and a wheel connecting member; in the same wheel assembly, the number of the walking wheels is at least two, and all the walking wheels are rotatably connected to the wheel connecting member in sequence along the extension direction of the bearing cable; the wheel connecting member is pivotally connected to the connection frame.

[0036] In a possible implementation manner, the wheel assembly further includes a pivot shaft and a wheel shaft parallel to the pivot shaft;

[0037] In the same wheel assembly, the number of the wheel connecting members is two, the walking wheel is clamped between the two wheel connecting members along a third direction, the wheel shaft passes through the two wheel connecting members and the walking wheel, and the walking wheel is configured to be able to rotate around the wheel shaft; the pivot shaft passes through the two wheel connecting members and is connected to the connection frame, and the two wheel connecting members are configured to be able to swing around the pivot shaft, the pivot shaft is parallel to the third direction, and there is an included angle between the pivot shaft and the extension direction of the bearing cable.

[0038] In a possible implementation manner, the connection frame includes a connection frame body and a wheel set mounting portion; the paired wheel set mounting portions are symmetrically connected to both ends of the connection frame body; the suspension frame is rotatably connected to the connection frame body, and the walking wheel set is connected to the wheel set mounting portion;

[0039] At least two of the walking wheel sets are arranged on one side of the connecting frame, and two of the walking wheel sets are arranged on both sides of the wheel set mounting part, and the pivot shafts corresponding to the two walking wheel sets are the same pivot shaft; the pivot shaft passes through the wheel set mounting part and connects the corresponding wheel connecting piece.

[0040] In a possible implementation manner, the paired walking wheel sets are symmetrically arranged on the connecting frame; the paired bearing cables are symmetrically arranged on both sides of the carrying device; the paired towing cables are symmetrically arranged on both sides of the carrying device;

[0041] The towing cable is located between the paired bearing cables; the bearing cable is located above the towing cable;

[0042] The suspension frame includes at least two suspension rod parts; the suspension rod parts are connected between the connecting frame and the energy storage device.

[0043] In a possible implementation manner, both the bearing cable and the towing cable are connected with tensioning devices; the tensioning devices include one or more of a weight type structure, a hydraulic type structure, and a lead screw type structure.

[0044] In a possible implementation manner, the wheel-driven bearing cable type gravity flow energy storage system further includes transfer equipment and a stacking and transporting yard; the transfer equipment and the stacking and transporting yard are both arranged at the low altitude position and the high altitude position;

[0045] The energy storage device is reciprocally transported between the stacking and transporting yard and the carrying device through the transfer equipment.

[0046] An energy storage method is applicable to the above-mentioned wheel-driven bearing cable type gravity flow energy storage system; the method includes:

[0047] During energy storage charging, the energy storage device is located at the low altitude position, the driving device is driven by electric energy, and the first steering wheel and the second steering wheel are driven to rotate in the first direction, so as to drive the towing cable to operate in the first direction, and further drive all the carrying devices to walk under the traction of the towing cable; a plurality of energy storage devices are successively assembled on the carrying devices, and are successively transported to the high altitude position along the bearing cable and unloaded, so as to convert electric energy into gravitational potential energy for storage;

[0048] During discharging, the energy storage device is located at the high altitude position, a plurality of energy storage devices are successively assembled on the carrying devices, walk to the low altitude position along the bearing cable and unloaded, and drive the towing cable to operate in the second direction; the towing cable drives the first steering wheel and the second steering wheel to operate in the second direction, so as to drive the power generation device to continuously generate electricity, so as to convert gravitational potential energy into continuous electric energy.

[0049] In a possible implementation, multiple said energy storage devices are assembled one by one on the carrying device at a preset spacing so that the energy storage devices are continuously carried;

[0050] The traveling speed and spacing of the energy storage devices are adjusted in real time according to requirements to change the magnitude of the gravity flow, so as to adjust the energy flow as needed, and further realize the functions of "slow charge and fast discharge" or "charge and discharge on demand".

[0051] In a possible implementation, the number of the wheel-driven cable-supported gravity flow energy storage systems is multiple;

[0052] According to the hillside terrain, multiple said wheel-driven cable-supported gravity flow energy storage systems are installed side by side in the horizontal direction, and / or, according to the hillside terrain, multiple said wheel-driven cable-supported gravity flow energy storage systems are stacked in the up-and-down direction.

[0053] The beneficial effects of the present invention mainly lie in:

[0054] The wheel-driven cable-supported gravity flow energy storage system and energy storage method provided by the present invention drive the energy storage device to move through the paired traction cables, and the paired carrying cables bear the load of the energy storage device. Compared with using a single cable for both carrying and traction, its safety and stability are higher; by circulating the traction cables between the first steering wheel and the second steering wheel, the energy storage devices can be continuously transported through the carrying device, which not only improves the system's transportation capacity but also provides a continuous gravity flow, and the continuous gravity flow can be converted into a continuous energy flow by the power generation device, thus realizing continuous power discharge.

[0055] To make the above objects, features, and advantages of the present application more obvious and understandable, the following specific preferred embodiments are given, and in conjunction with the attached drawings, the detailed description is as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0057] Figure 1 It is the first structural schematic diagram of the wheel-driven cable-supported gravity flow energy storage system provided by the embodiment of the present invention;

[0058] Figure 2 and Figure 3 is Figure 1 the partial enlarged view of the wheel-driven cable-supported gravity flow energy storage system shown;

[0059] Figure 4For Figure 1 Schematic structural diagram of the second steering wheel, driving device and power generation device shown;

[0060] Figure 5 For Figure 1 Schematic structural diagram of the carrier device and energy storage device shown;

[0061] Figure 6 This is the second schematic structural diagram of the wheel-driven load-bearing cable type gravity flow energy storage system provided by the embodiment of the present invention;

[0062] Figure 7 For Figure 6 Partial enlarged view of the wheel-driven load-bearing cable type gravity flow energy storage system shown;

[0063] Figure 8 For Figure 6 Schematic structural diagram of the carrier device and energy storage device shown;

[0064] Figure 9 For Figure 8 Partial enlarged view of the carrier device shown;

[0065] Figure 10 Schematic structural diagram of the rope connection structure provided by the embodiment of the present invention.

[0066] Icon: 110 - load-bearing cable; 111 - load-bearing fixed section; 112 - load-bearing guiding section; 113 - load-bearing inclined section; 114 - load-bearing fixing device; 115 - load-bearing support device; 120 - traction cable; 122 - traction guiding section; 123 - traction inclined section; 126 - traction guiding device; 130 - first steering wheel; 140 - second steering wheel;

[0067] 200 - carrier device; 210 - connecting frame; 211 - connecting frame body; 212 - wheel set mounting part; 220 - suspension frame; 221 - suspension rod part; 230 - traveling wheel set; 231 - traveling wheel; 232 - wheel connecting piece; 233 - pivot shaft; 234 - wheel shaft; 240 - rope connection structure; 241 - rope connection body; 242 - clamping claw; 243 - jaw; 244 - carrier bearing;

[0068] 300 - energy storage device; 400 - driving device; 500 - power generation device. Detailed implementation manners

[0069] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. Components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

[0070] Therefore, the detailed description of the embodiments of the present invention provided in the drawings below is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of the present invention.

[0071] It should be noted that like reference numerals and letters denote like items in the following figures. Therefore, once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

[0072] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship in which the inventive product is customarily placed during use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0073] In addition, the terms "horizontal", "vertical", "overhanging", etc. do not mean that the components are required to be absolutely horizontal or overhanging, but may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but may be slightly inclined.

[0074] In the description of the present invention, it should also be noted that unless otherwise clearly defined and limited, the terms "set", "install", "connected", "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0075] The following will describe some embodiments of the present invention in detail with reference to the accompanying drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0076] Embodiment

[0077] This embodiment provides a wheel-driven carrier cable type gravity flow energy storage system and an energy storage method; please refer to Figures 1-10 , Figures 1-5 The wheel-driven carrier cable type gravity flow energy storage system shown shows a pair of carrier cables and a pair of traction cables. Figures 6-9 The wheel-driven carrier cable type gravity flow energy storage system shown shows two pairs of carrier cables and a pair of traction cables.

[0078] The wheel-driven carrier cable type gravity flow energy storage system provided in this embodiment can be used to store electric energy, especially the electric energy generated by power generation technologies such as wind power and photovoltaic power, and can also be used to generate continuous discharge.

[0079] Referring to Figures 1-10 shown, the wheel-driven carrier cable type gravity flow energy storage system includes a first steering wheel 130, a second steering wheel 140, a carrier device 200, an energy storage device 300, a driving device 400, and a power generation device 500, and further includes at least one pair of carrier cables 110 for carrying the carrier device 200 and at least one pair of traction cables 120 for pulling the carrier device 200; the energy storage device 300 is detachably connected to the carrier device 200; optionally, each of the carrier devices 200 is located between the paired carrier cables and the paired traction cables.

[0080] Each traction cable 120 circulates between the first steering wheel 130 and the second steering wheel 140; the number of the first steering wheels 130 is the same as the number of the traction cables 120, that is, the number of the first steering wheels 130, the number of the second steering wheels 140, and the number of the traction cables 120 are the same. For example, when the number of the traction cables 120 is one pair, the number of the first steering wheels 130 and the number of the second steering wheels 140 are each two. The first steering wheel 130 is located at a low altitude; the second steering wheel 140 is located at a high altitude opposite to the low altitude; wherein, the altitude of the high altitude is higher than the altitude of the low altitude.

[0081] A plurality of carrier devices 200 are connected to the traction cable 120 along the running direction of the traction cable 120.

[0082] The driving device 400 is connected to the first steering wheel 130 and / or the second steering wheel 140 so as to be able to drive the traction cable 120 to operate in the first direction, that is, to be able to drive the first steering wheel 130 and the second steering wheel 140 to rotate around the first direction; all the transport devices 200 configured to load the energy storage device 300 walk under the traction of the traction cable 120 so as to be able to successively transport a plurality of energy storage devices 300 along the bearing cable 110 to a high altitude position, thereby converting electrical energy into gravitational potential energy for storage and realizing the charging function. Among them, the driving device 400 is connected to the first steering wheel 130 and / or the second steering wheel 140, specifically, the driving device 400 is connected to the first steering wheel 130, or the driving device 400 is connected to the second steering wheel 140, or the driving device 400 is connected to both the first steering wheel 130 and the second steering wheel 140.

[0083] The power generation device 500 is connected to the first steering wheel 130 and / or the second steering wheel 140; a plurality of transport devices 200 configured to load the energy storage device 300 and loaded with the energy storage device 300 walk along the bearing cable 110 to successively transport a plurality of energy storage devices 300 to a low altitude position and form a continuous gravity flow, and at the same time drive the first steering wheel 130 and the second steering wheel 140 to operate along the second direction with the traction cable 120 to drive the power generation device 500 to generate electricity, so as to convert the continuous gravity flow into a continuous energy flow, thereby realizing continuous discharge; among them, the first direction is opposite to the second direction. For example, if the first direction is the clockwise direction, the second direction is the counterclockwise direction, and vice versa. In this embodiment, the driving device 400 drives the traction cable 120 through the steering wheel to drive the transport device 200 to walk along the bearing cable 110, transport the energy storage device 300 up and down, so as to convert the gravity flow formed by the successive online walking of several energy storage devices 300 into a continuous energy flow, thereby realizing continuous charge and discharge.

[0084] Optionally, both the first steering wheel 130 and the second steering wheel 140 are connected to the bracket.

[0085] In the wheel-driven bearing cable type gravity flow energy storage system described in this embodiment, the paired traction cables 120 are used to drive the energy storage device 300 to move, and the paired bearing cables 110 bear the load of the energy storage device 300. Compared with using a single cable for both bearing and traction, its safety and stability are higher; by the traction cable 120 circulating and operating between the first steering wheel 130 and the second steering wheel 140, the energy storage device 300 can be successively transported through the transport device 200, which not only improves the system transport capacity, but also provides a continuous gravity flow, and the continuous gravity flow can be converted into a continuous energy flow by the power generation device 500, thereby realizing continuous discharge.

[0086] See Figures 1-7As shown, in an alternative solution of this embodiment, the axes of both the first steering wheel 130 and the second steering wheel 140 are parallel to the horizontal direction; this is equivalent to placing the first steering wheel 130 and the second steering wheel 140 vertically. Compared with horizontal placement, it requires less ground space, has simpler terrain requirements, and is convenient for installation in more slope sections. At the same time, the smaller installation space facilitates the installation of multiple systems simultaneously, which can improve the system's transportation capacity and increase the high-power storage / discharge of electric energy.

[0087] See Figures 2-4 、 Figure 7 As shown, in an alternative solution of this embodiment, all the first steering wheels 130 are connected by a first coupling; connecting all the first steering wheels 130 by the first coupling facilitates the synchronous rotation of all the first steering wheels 130.

[0088] Optionally, all the second steering wheels 140 are connected by a second coupling; connecting all the second steering wheels 140 by the second coupling facilitates the synchronous rotation of all the second steering wheels 140.

[0089] Optionally, both the first steering wheel 130 and the second steering wheel 140 are provided with wheel grooves that cooperate with the traction cable 120. Through the wheel grooves, the friction between the traction cable 120 and the first steering wheel 130 and the second steering wheel 140 can be increased, and the traction cable 120 can also be prevented from detaching from the first steering wheel 130 and the second steering wheel 140.

[0090] Optionally, the drive device 400 is connected to the first coupling and / or the second coupling, that is, the drive device 400 is connected to the first steering wheel 130 and / or the second steering wheel 140. In this embodiment, the drive device 400 can be arranged at a low altitude or a high altitude, or drive devices 400 are arranged at both low and high altitudes to drive and connect the couplings. Being located at a high altitude can reduce the load during the energy storage process, and being located at a low altitude is convenient for the installation of the drive device 400.

[0091] Optionally, the power generation device 500 is connected to the first coupling and / or the second coupling, that is, the power generation device 500 is connected to the first steering wheel 130 and / or the second steering wheel 140. In this embodiment, the power generation device 500 can be arranged at a low altitude or a high altitude, or power generation devices 500 are arranged at both low and high altitudes to connect the couplings. Being located at a high altitude can reduce the load during the energy storage process, and being located at a low altitude is convenient for the installation of the power generation device 500.

[0092] In this embodiment, the driving device 400 and the power generation device 500 can be integrated or separated. Optionally, the driving device 400 and the power generation device 500 are motor-generators, or the driving device 400 and the power generation device 500 are independent of each other. Among them, a motor-generator (English name: Motor-Generator) refers to a device that can function both as a motor to convert electrical energy into gravitational potential energy and as a generator to convert gravitational potential energy into electrical energy, and it has a two-way energy conversion function.

[0093] See Figures 1-3 , Figure 6 and Figure 7 As shown in, in an alternative embodiment of the present embodiment, each traction cable 120 is annular; the traction cable 120 includes a first traction cable portion, a second traction cable portion, and two traction mating portions; the two traction mating portions cooperate with the first steering wheel 130 and the second steering wheel 140 respectively; both ends of the first traction cable portion and both ends of the second traction cable portion are connected to the traction mating portions respectively and form an annular shape; that is, the first traction cable portion, the traction mating portion, the second traction cable portion, and the traction mating portion are connected end to end to form an annular shape.

[0094] Both the first traction cable portion and the second traction cable portion include two traction guiding segments 122 and one traction inclined segment 123; the traction inclined segment 123 is connected between the two traction guiding segments 122.

[0095] The wheel-driven load-bearing cable type gravity flow energy storage system further includes a traction guiding device 126; the traction guiding device 126 is provided at both the low altitude position and the high altitude position; the traction inclined segment 123 is located between the traction guiding device 126 at the low altitude position and the traction guiding device 126 at the high altitude position. The traction inclined segment 123 is, for example, located on a hillside between the low altitude position and the high altitude position. Through the traction guiding device 126, it is convenient to guide the traction cable 120, and the traction cable 120 can be guided from an inclined state to a horizontal state, and the traction cable 120 can also be guided from a horizontal state to an inclined state. Through the two traction guiding segments 122, it helps the energy storage device 300 to be transported.

[0096] See Figures 1-3 , Figure 6 and Figure 7 As shown in, in an alternative embodiment of the present embodiment, the load-bearing cable 110 includes two load-bearing fixed segments 111, two load-bearing guiding segments 112, and one load-bearing inclined segment 113; the load-bearing guiding segment 112 is connected between the load-bearing fixed segment 111 and the load-bearing inclined segment 113. That is, the load-bearing cable 110 includes a load-bearing fixed segment 111, a load-bearing guiding segment 112, a load-bearing inclined segment 113, a load-bearing guiding segment 112, and a load-bearing fixed segment 111 connected in sequence. In this embodiment, the load-bearing cable 110 is in a broken line shape.

[0097] The wheel-driven load-bearing cable type gravity flow energy storage system further includes a load-bearing fixing device 114, a load-bearing support device 115, and a load-bearing guiding device (the load-bearing guiding device is not shown in the figure for clearer display of other structures); the load-bearing fixing device 114, the load-bearing support device 115, and the load-bearing guiding device are provided at both the low altitude position and the high altitude position.

[0098] The end of each load-bearing cable 110 sequentially passes through the load-bearing guiding device, the load-bearing support device 115, and is fixedly connected to the load-bearing fixing device 114; the load-bearing fixing section 111 is located between the load-bearing fixing device 114 and the load-bearing support device 115, the load-bearing guiding section 112 is located between the load-bearing support device 115 and the load-bearing guiding device, and the load-bearing inclined section 113 is located between the load-bearing guiding device at the low altitude position and the load-bearing guiding device at the high altitude position; through the two load-bearing guiding sections 112, it helps the energy storage device 300 to be transported at the low altitude position and the high altitude position, and through the load-bearing fixing section 111, the end of the load-bearing cable 110 is fixed.

[0099] Optionally, the load-bearing fixing device 114 adopts an anchoring method or other fixing methods.

[0100] Optionally, the traction guiding section 122 is parallel to the horizontal direction; by making the traction guiding section 122 parallel to the horizontal direction, it is convenient for the energy storage device 300 to be transported.

[0101] Optionally, the load-bearing guiding section 112 is parallel to the horizontal direction; by making the load-bearing guiding section 112 parallel to the horizontal direction, it is convenient for the energy storage device 300 to be transported.

[0102] Optionally, the first traction cable part is connected to the top of the first steering wheel 130, and the second traction cable part is connected to the bottom of the first steering wheel 130, that is, the first traction cable part is connected to the top of the second steering wheel 140, and the second traction cable part is connected to the bottom of the second steering wheel 140. The position of the traction guiding section 122 of the first traction cable part corresponds to the position of the load-bearing guiding section 112, and the position of the traction inclined section 123 of the first traction cable part corresponds to the position of the load-bearing inclined section 113. Adopting this design helps to improve the stability and accuracy of the carrier device 200 when walking.

[0103] See Figure 5 and Figure 8 As shown, in the optional solution of this embodiment, the carrier device 200 includes a connecting frame 210, a suspension frame 220, a walking wheel set 230, and a rope connection structure 240.

[0104] The suspension frame 220 is rotatably connected to the connecting frame 210; for example, the suspension frame 220 can rotate 360 degrees on the connecting frame 210.

[0105] The energy storage device 300 is detachably connected to the suspension frame 220.

[0106] At least one pair of traveling wheel sets 230 are arranged on both sides of the connecting frame 210; the traveling wheel sets 230 are configured to be able to travel on the carrying cable 110; the number of the traveling wheel sets 230 is the same as the number of the carrying cables 110.

[0107] At least one pair of rope connection structures 240 are rotatably connected to both sides of the connecting frame 210; the rope connection structures 240 are fixedly connected to the towing cable 120, and there is an included angle between the rotation axis of the rope connection structures 240 and the extending direction of the towing cable 120. Optionally, the rotation axis of the rope connection structures 240 is perpendicular to the extending direction of the towing cable 120. By rotatably connecting the rope connection structures 240 to the connecting frame 210, it is convenient for the carrying device 200 to travel along the annular towing cable 120. By adopting the paired rope connection structures 240 to connect the connecting frame 210, the stability of the carrying device 200 during traveling is improved. In this embodiment, the number of the rope connection structures 240 can be selected according to factors such as the material and connection strength of the rope connection structures 240.

[0108] See Figure 9 and Figure 10 As shown, in an alternative solution of this embodiment, each towing cable 120 is annular. The rope connection structures 240 can be in various forms, such as claw type, buckle, etc. For example, the rope connection structure 240 includes a rope connection body 241 and a claw 242; the claw 242 is fixedly connected to the end of the rope connection body 241, and the jaws 243 of the claw 242 face the center line of the towing cable 120; by having the jaws 243 of the claw 242 face the center line of the towing cable 120, it is convenient for the claw 242 to move along with the towing cable 120, and when the carrying device 200 rotates to the first turning wheel 130 or the second turning wheel 140, the rotation interference of the rope connection structure 240 at the first turning wheel 130 or the second turning wheel 140 is reduced, so as to facilitate the rope connection structure 240 to pass through the first turning wheel 130 or the second turning wheel 140 smoothly.

[0109] The claw 242 is fixedly connected to the towing cable 120. A carrying bearing 244 is connected between the rope connection body 241 and the connecting frame 210. Through the carrying bearing 244, the friction between the rope connection body 241 and the connecting frame 210 is reduced, which helps the carrying device 200 to rotate at the first turning wheel 130 or the second turning wheel 140.

[0110] Optionally, the carrying bearing 244 is a sliding bearing. The sliding bearing has a high bearing capacity, which provides a guarantee for continuously transporting the energy storage device 300 in the wheel-driven carrying cable type gravity flow energy storage system.

[0111] See Figures 1-10As shown, in an alternative solution of this embodiment, the traveling wheel set 230 includes at least one wheel component; when the number of wheel components is multiple, the multiple wheel components are arranged in sequence along the extension direction of the bearing cable 110; through the multiple wheel components, it is convenient for the bearing cable 110 to better support the carrier device 200 and the energy storage device 300 through the traveling wheel set 230.

[0112] The wheel component includes a traveling wheel 231 and a wheel connecting member 232; in the same wheel component, the number of traveling wheels 231 is at least two, and all the traveling wheels 231 are rotatably connected to the wheel connecting member 232 in sequence along the extension direction of the bearing cable 110; the wheel connecting member 232 is pivotally connected to the connecting frame 210. Through the traveling wheel 231 and the wheel connecting member 232, the bearing capacity of the traveling wheel set 230 and the stability during traveling are further improved.

[0113] Optionally, in order to further improve the bearing capacity of the traveling wheel set 230 and the stability during traveling, the wheel component further includes a pivot shaft 233 and a wheel shaft 234 parallel to the pivot shaft 233; in the same wheel component, the number of wheel connecting members 232 is two, the traveling wheel 231 is clamped between the two wheel connecting members 232 along the third direction, the wheel shaft 234 passes through the two wheel connecting members 232 and the traveling wheel 231, and the traveling wheel 231 is configured to be able to rotate around the wheel shaft 234; the pivot shaft 233 passes through the two wheel connecting members 232 and is connected to the connecting frame 210, and the two wheel connecting members 232 are configured to be able to swing around the pivot shaft 233, the pivot shaft 233 is parallel to the third direction, and there is an included angle between the pivot shaft 233 and the extension direction of the bearing cable 110. Optionally, the pivot shaft 233 is perpendicular to the extension direction of the bearing cable 110.

[0114] See Figures 1-8 As shown, in an alternative solution of this embodiment, the connecting frame 210 includes a connecting frame body 211 and a wheel set mounting portion 212; the paired wheel set mounting portions 212 are symmetrically connected to both ends of the connecting frame body 211; the suspension frame 220 is rotatably connected to the connecting frame body 211, and the traveling wheel set 230 is connected to the wheel set mounting portion 212; by setting the connecting frame 210 as the connecting frame body 211 and the wheel set mounting portion 212, it helps the connecting frame 210 to support and connect the suspension frame 220, the traveling wheel set 230 and the rope connection structure 240.

[0115] As Figures 6-9 As shown, at least two traveling wheel sets 230 are provided on one side of the connecting frame 210, and two of the traveling wheel sets 230 are arranged on both sides of the wheel set mounting portion 212, and the corresponding pivot shafts 233 of the two traveling wheel sets 230 are the same pivot shaft 233; the pivot shaft 233 passes through the wheel set mounting portion 212 and connects the corresponding wheel connecting members 232. By providing at least two traveling wheel sets 230, the stability of the carrier device 200 during traveling is improved.

[0116] Optionally, the paired walking wheel sets 230 are symmetrically arranged on the connecting frame 210; optionally, the paired bearing cables 110 are symmetrically arranged on both sides of the carrying device 200; optionally, the paired towing cables 120 are symmetrically arranged on both sides of the carrying device 200.

[0117] Optionally, the towing cable 120 is located between the paired bearing cables 110; the bearing cable 110 is located above the towing cable 120; by positioning the bearing cable 110 above the towing cable 120, it helps the bearing cable 110 to carry the carrying device 200 and the energy storage device 300.

[0118] Optionally, the suspension frame 220 includes at least two suspension rod parts 221; the suspension rod parts 221 are connected between the connecting frame 210 and the energy storage device 300. Through the at least two suspension rod parts 221, the bearing capacity and stability of the suspension frame 220 for carrying the energy storage device 300 are improved.

[0119] In an alternative solution of this embodiment, both the bearing cable 110 and the towing cable 120 are connected with a tensioning device; the tensioning device includes one or more of a weight type structure, a hydraulic type structure, and a screw type structure, and the tensioning device can also adopt other form structures. Through the tensioning device, the pre-tension of the bearing cable 110 and the towing cable 120 is increased, which helps the bearing cable 110 and the towing cable 120 to operate normally. Figure 1 and Figure 6 The shown tensioning device is of a screw type structure.

[0120] In an alternative solution of this embodiment, the wheel-driven bearing cable type gravity flow energy storage system further includes a transfer device and a stacking yard; the transfer device and the stacking yard are both provided at the low altitude position and the high altitude position; the energy storage device 300 is reciprocally transported between the stacking yard and the carrying device 200 through the transfer device to achieve charging energy storage and discharging.

[0121] The wheel-driven bearing cable type gravity flow energy storage system provided in this embodiment has the following beneficial effects compared with the prior art:

[0122] 1. The paired towing cables 120 are used to drive the energy storage device 300 to move, and the paired bearing cables 110 bear the load of the energy storage device 300, effectively reducing the load borne by a single cableway, ensuring the safety and reliability of the system, and improving the load-bearing capacity of the system. Compared with using a single cable to carry and tow simultaneously, the safety and stability are higher. At the same time, the reduction of the load on a single cableway means that more energy storage devices 300 can be transported synchronously, enhancing the system's transportation capacity, ensuring the high-efficiency operation of the energy storage and power generation states, and enabling high-power storage / discharge of electric energy.

[0123] 2. The axial directions of the first steering wheel 130 and the second steering wheel 140 are both parallel to the horizontal direction, similar to placing the rotating wheels vertically. Compared with horizontal placement, it requires less ground space, has simpler terrain requirements, and is convenient for installation in more slope sections. At the same time, the smaller installation space is convenient for installing multiple systems simultaneously, which can improve the system's transportation capacity and increase the high-power storage / discharge of electric energy.

[0124] 3. The carrier device 200 is fixedly installed on the carrying cable 110, and the carrier device 200 loaded with the energy storage device 300 transports the energy storage device 300 along the carrying cable 110. Compared with the detachable installation, not only is the system structure simple, but it also avoids using components that need to be frequently opened and closed, ensuring the reliability of system installation and reducing maintenance costs.

[0125] 4. Using the carrying cable 110 as the sliding track avoids heavy components such as steel rails, reduces the transportation difficulty during system installation, and is more convenient for deployment.

[0126] 5. The energy storage device 300 handling system generates a continuous gravity flow, which can form a stable and adjustable energy flow, thereby achieving continuous discharge.

[0127] 6. By changing the lifting speed of the gravity flow or changing the size of the gravity flow, the electricity consumption or power generation in the real-time state can be arbitrarily adjusted; the energy storage device 300 is safely and economically stored and efficiently and quickly accessed.

[0128] This embodiment also provides an energy storage method, which is applicable to the wheel-driven carrying cable type gravity flow energy storage system described in any of the above embodiments. The method includes:

[0129] During energy storage charging, the energy storage device 300 is located at a low altitude. The driving device 400 is driven by electric energy, driving the first steering wheel 130 and the second steering wheel 140 to rotate in the first direction, so as to drive the traction cable 120 to operate in the first direction, and then driving all the carrier devices 200 to move under the traction of the traction cable 120; enabling multiple energy storage devices 300 to be successively assembled on the carrier device 200, and transported along the carrying cable 110 to a high altitude and unloaded, thereby converting electric energy into gravitational potential energy for storage;

[0130] During discharging, the energy storage device 300 is located at a high altitude. Multiple energy storage devices 300 are successively assembled on the carrier device 200 and move along the carrying cable 110 to a low altitude and unloaded, driving the traction cable 120 to operate in the second direction; the traction cable 120 drives the first steering wheel 130 and the second steering wheel 140 to operate in the second direction, so as to drive the power generation device 500 to continuously generate electricity, thereby converting gravitational potential energy into continuous electric energy, so that the gravity flow formed by the continuous online movement of several energy storage devices 300 is converted into a continuous energy flow, thereby achieving continuous charge and discharge.

[0131] In the energy storage method of this embodiment, the traction cables 120 arranged in pairs of the wheel-driven cable-supported gravity flow energy storage system drive the energy storage device 300 to move. The cable-supported cables 110 arranged in pairs bear the load of the energy storage device 300. Compared with using a single cable for both bearing and traction, its safety and stability are higher. By circulating the traction cables 120 between the first steering wheel 130 and the second steering wheel 140, the energy storage device 300 can be continuously transported through the transport device 200. This not only improves the system's transport capacity but also provides a continuous gravity flow, which can be converted into a continuous energy flow by the power generation device 500, thereby achieving continuous power discharge.

[0132] The energy storage method provided in this embodiment is applicable to the above-mentioned wheel-driven cable-supported gravity flow energy storage system. The technical features of the publicly disclosed wheel-driven cable-supported gravity flow energy storage system are also applicable to this energy storage method, and the technical features of the publicly disclosed wheel-driven cable-supported gravity flow energy storage system will not be repeated here. In this embodiment, the wheel-driven cable-supported gravity flow energy storage system adopts the above energy storage method, and the publicly disclosed energy storage method is also applicable to this wheel-driven cable-supported gravity flow energy storage system.

[0133] In an optional solution of this embodiment, multiple energy storage devices 300 are assembled on the transport device 200 one by one at a preset interval to enable continuous transportation of the energy storage device 300. Among them, the preset interval can be, for example, one energy storage device 300 is assembled on each transport device 200, or one energy storage device 300 is assembled on every other transport device 200, or one energy storage device 300 is assembled on every two transport devices 200, etc.

[0134] The traveling speed and interval of the energy storage device 300 are adjusted in real time according to requirements to change the magnitude of the gravity flow, so as to adjust the energy flow as needed, and further achieve the functions of "slow charge and fast discharge" or "charge and discharge as needed". Adjusting the traveling speed of the energy storage device 300 can be achieved, for example, by adjusting the speed of the driving device 400 and the power generation device 500. By adjusting the traveling speed and interval of the energy storage device 300 in real time according to requirements to change the magnitude of the gravity flow, the adaptability of the wheel-driven cable-supported gravity flow energy storage system can be made wider.

[0135] In an optional solution of this embodiment, the number of wheel-driven cable-supported gravity flow energy storage systems is multiple; multiple wheel-driven cable-supported gravity flow energy storage systems are installed side by side in the horizontal direction according to the hillside terrain, and / or multiple wheel-driven cable-supported gravity flow energy storage systems are stacked in the up and down direction according to the hillside terrain. By installing multiple wheel-driven cable-supported gravity flow energy storage systems side by side in the horizontal direction according to the hillside terrain and stacking multiple wheel-driven cable-supported gravity flow energy storage systems in the up and down direction according to the hillside terrain, a larger-scale energy storage can be achieved.

[0136] To better understand the wheel-driven cable-supported gravity flow energy storage system and energy storage method described in this embodiment, the following examples are provided:

[0137] Power storage stage: During the power storage process, when the driving device 400 and the power generation device 500 are motor-generators, the motor-generator plays a core role in energy conversion. The motor-generator draws electrical energy from the power grid and converts it into kinetic energy. The kinetic energy is then smoothly transmitted to the first steering wheel 130 and the second steering wheel 140, driving them to rotate in the clockwise direction. The first steering wheel 130 and the second steering wheel 140, relying on the friction between their surfaces and the traction cable 120, cause the traction cable 120 to start moving. Both the first steering wheel 130 and the second steering wheel 140 rotate in the clockwise direction. As the traction cable 120 continues to move, the carrier device 200 clamped on it is pulled to move forward along the support cable 110. The carrier device 200 is equipped with a suspension frame 220, which hoists the energy storage device 300 located in the lower storage yard, causing it to move together with the carrier device 200. When approaching the upper storage yard, the energy storage device 300 is separated from the suspension frame 220 on the carrier device 200, and the energy storage device 300 is sent into the upper storage yard and quickly transported away by a transfer vehicle for storage. The carrier device 200 continues to travel along the traction cable 120 and finally returns to the lower storage yard to prepare for a new round of energy storage device 300 transportation tasks.

[0138] Power discharge stage: During the power discharge process, the energy storage device 300 located in the upper storage yard is brought into a section of the support cable 110 by the carrier device 200. Here, the energy storage device 300 is fixed through the suspension frame 220 on the carrier device 200. Subsequently, under the action of gravity, the energy storage device 300 slides downward along the support cable 110 together with the carrier device 200, releasing the stored energy. The carrier device 200, through its clamping force, causes the traction cable 120 to start moving. The traction cable 120 then transmits the movement to the first steering wheel 130 and the second steering wheel 140 through the friction between it and the first steering wheel 130 and the second steering wheel 140, driving the first steering wheel 130 and the second steering wheel 140 to rotate in the counterclockwise direction, and then transmitting it to the motor-generator. The motor-generator enters the power generation mode, converts the kinetic energy into electrical energy, and inputs it into the power grid. When approaching the lower storage yard, the energy storage device 300 is separated from the suspension frame 220 on the carrier device 200, and the energy storage device 300 is sent into the lower storage yard and transported away by a transfer vehicle for storage. The carrier device 200 continues to travel along the traction cable 120. Finally, the carrier device 200 returns to the upper storage yard to prepare for a new round of energy storage device 300 transportation tasks.

[0139] Example of the power generation amount using the wheel-driven cable-supported gravity flow energy storage system and energy storage method described in this embodiment:

[0140] The energy storage device 300 has a reinforced concrete main body with a density of 2500 kg / m 3 . It is in the shape of a cuboid with a length of 1.2 m × a width of 1.2 m × a height of 1.0 m and weighs 3.6 tons. Assuming the vertical height difference of the hillside is 500 m, lifting a single energy storage device 300 from the bottom of the mountain (i.e., the low altitude position) to the top of the mountain (i.e., the high altitude position), the stored energy E = mgh = 3.6×10 3 kg × 9.8 m / s 2 ×500 m = 17,640,000 J = 4.9 kWh. Referring to the operating speeds of equipment such as passenger ropeways, freight ropeways, and mine hoists, if the speed is 8 m / s, it can run 28.8 km per hour. Assuming the energy storage devices 300 are arranged at an interval of 10 m, then 2880 energy storage devices 300 can be transported to the top of the mountain per hour, and the energy stored per hour is 2880 × 4.9 kWh / device = 14112.0 kW·h ≈ 14.1 MWh. To improve the power generation capacity, a multi-system parallel multi-row and / or up-and-down stacked arrangement can be adopted on the hillside terrain; or the speed of the traction cable 120 can be increased or the spacing of the energy storage devices 300 can be reduced to expand the energy storage scale.

[0141] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, various changes and modifications can be made to the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A wheel-driven, cable-type gravity flow energy storage system, characterized in that: The invention comprises a first steering wheel (130), a second steering wheel (140), a carrier (200), an energy storage device (300), a driving device (400), and a power generation device (500), and further comprises at least one pair of carrying ropes (110) for carrying the carrier (200) and at least one pair of traction ropes (120) for traction of the carrier (200); the energy storage device (300) is detachably connected to the carrier (200); Each of the traction ropes (120) circulates between the first steering wheel (130) and the second steering wheel (140); the number of the first steering wheels (130) and the number of the second steering wheels (140) are consistent with the number of the traction ropes (120); wherein the first steering wheel (130) is located at a low altitude position, and the second steering wheel (140) is located at a high altitude position opposite to the low altitude position; The driving device (400) is connected to the first steering wheel (130) and / or the second steering wheel (140) to drive the traction rope (120) to run in a first direction; all the carrying devices (200) travel under the traction of the traction rope (120) to enable the plurality of energy storage devices (300) to be successively transported to a high altitude along the carrying rope (110), thereby converting electrical energy into gravitational potential energy for storage; The power generation device (500) is connected to the first steering wheel (130) and / or the second steering wheel (140); a plurality of the carrier devices (200) loaded with the energy storage devices (300) travel along the carrying rope (110) to successively transport the plurality of energy storage devices (300) to a low altitude position and form a continuous gravity flow, while driving the first steering wheel (130) and the second steering wheel (140) to operate along the traction rope (120) in a second direction to drive the power generation device (500) to generate electricity, thereby converting the continuous gravity flow into a continuous energy flow, thereby achieving continuous discharge; wherein the first direction is opposite to the second direction; The carrying device (200) comprises a connecting frame (210), a suspension frame (220), a running wheel set (230), and a rope connection structure (240); The suspension frame (220) is rotatably connected to the connecting frame (210); the energy storage device (300) is detachably connected to the suspension frame (220); At least one pair of the running wheel assemblies (230) is arranged on both sides of the connecting frame (210); the running wheel assemblies (230) are configured to be able to run on the carrying cables (110); the number of the running wheel assemblies (230) is the same as the number of the carrying cables (110); At least one pair of the rope connection structures (240) is rotatably connected to both sides of the connection frame (210); the rope connection structure (240) is fixedly connected to the traction rope (120); The rope connection structure (240) comprises a rope connection body (241) and a claw (242); the claw (242) is fixedly connected to the end of the rope connection body (241), and the jaw (243) of the claw (242) faces the center line of the traction rope (120).

2. The wheel-driven, load-bearing, cable-type gravity flow energy storage system according to claim 1, characterized in that: The axial direction of the first steering wheel (130) and the axial direction of the second steering wheel (140) are both parallel to the horizontal direction.

3. The wheel-driven, load-bearing, cable-type gravity flow energy storage system according to claim 1, characterized in that: All of the first steering wheels (130) are connected via a first coupling, and all of the second steering wheels (140) are connected via a second coupling; The first steering wheel (130) and the second steering wheel (140) are both provided with wheel grooves that cooperate with the traction rope (120); The first steering wheel (130) and the second steering wheel (140) are both connected to the bracket; The driving device (400) is connected to the first coupling and / or the second coupling; The power generation device (500) is connected to the first coupling and / or the second coupling; The driving device (400) and the power generation device (500) are electric generators, or the driving device (400) and the power generation device (500) are independent of each other.

4. The wheel-driven, load-bearing, cable-type gravity flow energy storage system according to claim 1, characterized in that: Each traction rope (120) is annular; the traction rope (120) comprises a first traction rope portion, a second traction rope portion, and two traction matching portions; the two traction matching portions respectively match the first steering wheel (130) and the second steering wheel (140); both ends of the first traction rope portion and both ends of the second traction rope portion are respectively connected to the traction matching portions to form an annular shape; The first traction rope portion and the second traction rope portion each comprise two traction guide sections (122) and a traction inclined section (123); the traction inclined section (123) is connected between the two traction guide sections (122); The wheel-driven, load-bearing, rope-type gravity flow energy storage system further comprises a traction guide device (126); the traction guide device (126) is provided at both the low altitude position and the high altitude position; The traction inclined section (123) is located between the traction guide device (126) at the low altitude position and the traction guide device (126) at the high altitude position.

5. The wheel-driven, cable-type gravity flow energy storage system according to claim 4, characterized in that: The load-bearing cable (110) comprises two load-bearing fixed sections (111), two load-bearing guide sections (112) and one load-bearing inclined section (113); the load-bearing guide section (112) is connected between the load-bearing fixed section (111) and the load-bearing inclined section (113); The wheel-driven load-bearing cable-type gravity flow energy storage system further comprises a load-bearing fixing device (114), a load-bearing support device (115), and a load-bearing guide device; the load-bearing fixing device (114), the load-bearing support device (115), and the load-bearing guide device are both provided at the low altitude position and the high altitude position; The end of each load-bearing rope (110) passes through the load-bearing guide device and the load-bearing support device (115) in sequence and is fixedly connected to the load-bearing fixing device (114); the load-bearing fixing section (111) is located between the load-bearing fixing device (114) and the load-bearing support device (115); the load-bearing guide section (112) is located between the load-bearing support device (115) and the load-bearing guide device; and the load-bearing inclined section (113) is located between the load-bearing guide device at the low altitude position and the load-bearing guide device at the high altitude position; The load-bearing fixing device (114) adopts an anchoring method; The traction guide section (122) is parallel to the horizontal direction; the load-bearing guide section (112) is parallel to the horizontal direction; The first traction rope portion is connected to the top of the first steering wheel (130), and the second traction rope portion is connected to the bottom of the first steering wheel (130); the position of the traction guide section (122) of the first traction rope portion corresponds to the position of the load-bearing guide section (112), and the position of the traction inclined section (123) of the first traction rope portion corresponds to the position of the load-bearing inclined section (113).

6. The wheel-driven, load-bearing, cable-type gravity flow energy storage system according to claim 1, characterized in that: Each of the traction ropes (120) is ring-shaped; An angle is formed between the rotation axis of the rope connection structure (240) and the extension direction of the traction rope (120); The claw (242) is fixedly connected to the traction rope (120); A carrying bearing (244) is connected between the rope connection body (241) and the connecting frame (210).

7. The wheel-driven, cable-type gravity flow energy storage system according to claim 1, characterized in that: The traveling wheel set (230) includes at least one wheel assembly; when there are multiple wheel assemblies, the multiple wheel assemblies are arranged in sequence along the extension direction of the carrying cable (110); The wheel assembly comprises a running wheel (231) and a wheel connecting member (232); in the same wheel assembly, the number of the running wheels (231) is at least two, and all the running wheels (231) are rotatably connected to the wheel connecting member (232) in sequence along the extension direction of the load-bearing cable (110); the wheel connecting member (232) is pivotally connected to the connecting frame (210).

8. The wheel-driven, cable-type gravity flow energy storage system according to claim 7, characterized in that: The wheel assembly further includes a pivot shaft (233) and a wheel shaft (234) parallel to the pivot shaft (233); In the same wheel assembly, the number of the wheel connectors (232) is two, the traveling wheel (231) is sandwiched between the two wheel connectors (232) along a third direction, the wheel axle (234) passes through the two wheel connectors (232) and the traveling wheel (231), and the traveling wheel (231) is configured to be able to rotate around the wheel axle (234); the pivot shaft (233) passes through the two wheel connectors (232) and is connected to the connecting frame (210), and the two wheel connectors (232) are configured to be able to swing around the pivot shaft (233), and the pivot shaft (233) is parallel to the third direction and has an angle with the extension direction of the load-bearing cable (110).

9. The wheel-driven, load-bearing, cable-type gravity flow energy storage system according to claim 8, characterized in that: The connecting frame (210) comprises a connecting frame body (211) and a wheel assembly mounting portion (212); the wheel assembly mounting portions (212) arranged in pairs are symmetrically connected to both ends of the connecting frame body (211); the suspension frame (220) is rotatably connected to the connecting frame body (211), and the running wheel assembly (230) is connected to the wheel assembly mounting portion (212); At least two running wheel assemblies (230) are provided on one side of the connecting frame (210), wherein the two running wheel assemblies (230) are provided on both sides of the wheel assembly mounting portion (212), and the pivot shafts (233) corresponding to the two running wheel assemblies (230) are the same pivot shaft (233); the pivot shaft (233) passes through the wheel assembly mounting portion (212) and is connected to the corresponding wheel connecting member (232).

10. The wheel-driven, load-bearing, cable-type gravity flow energy storage system according to claim 1, characterized in that: The traveling wheel sets (230) arranged in pairs are symmetrically arranged on the connecting frame (210); the carrying ropes (110) arranged in pairs are symmetrically arranged on both sides of the carrier (200); and the traction ropes (120) arranged in pairs are symmetrically arranged on both sides of the carrier (200); The traction rope (120) is located between the supporting ropes (110) arranged in pairs; the supporting rope (110) is located above the traction rope (120); The suspension frame (220) comprises at least two suspension rod portions (221); the suspension rod portions (221) are connected between the connection frame (210) and the energy storage device (300).

11. The wheel-driven, load-bearing, cable-type gravity flow energy storage system according to claim 1, characterized in that: The load-bearing rope (110) and the traction rope (120) are both connected to a tensioning device; the tensioning device comprises one or more of a weight hammer structure, a hydraulic structure, and a screw structure.

12. The wheel-driven, load-bearing, cable-type gravity flow energy storage system according to claim 1, characterized in that: The wheel-driven load-bearing cable-type gravity flow energy storage system further includes a transfer device and a stacking yard; the transfer device and the stacking yard are both provided at the low altitude position and the high altitude position; The energy storage device (300) is transported back and forth between the storage yard and the transport device (200) by the transfer equipment.

13. An energy storage method, characterized in that: Applicable to the wheel-driven load-bearing cable-type gravity flow energy storage system according to any one of claims 1 to 12; the method comprises: During energy storage and charging, the energy storage device (300) is located at a low altitude, and the driving device (400) is driven by electric energy to drive the first steering wheel (130) and the second steering wheel (140) to rotate in a first direction, thereby driving the traction rope (120) to run in the first direction, thereby driving all the carriers (200) to travel under the traction of the traction rope (120); multiple energy storage devices (300) are successively assembled on the carrier (200), successively transported to a high altitude along the carrying rope (110) and unloaded, thereby converting electric energy into gravitational potential energy for storage; During discharge, the energy storage device (300) is located at a high altitude, and a plurality of the energy storage devices (300) are successively assembled on the carrier device (200), moved along the carrying rope (110) to a low altitude and unloaded, driving the traction rope (120) to operate in a second direction; the traction rope (120) drives the first steering wheel (130) and the second steering wheel (140) to operate in the second direction, so as to drive the power generation device (500) to continuously generate electricity, thereby converting gravitational potential energy into continuous electrical energy.

14. The energy storage method according to claim 13, characterized in that: A plurality of the energy storage devices (300) are assembled one by one on the carrying device (200) at a preset interval, so that the energy storage devices (300) are carried continuously; The travel speed and spacing of the energy storage device (300) are adjusted in real time according to demand to change the magnitude of the gravity flow, thereby achieving on-demand adjustment of the energy flow, thereby realizing the "slow charging and fast discharging" or "on-demand charging and discharging" functions.

15. The energy storage method according to claim 13, characterized in that: There are multiple wheel-driven load-bearing cable-type gravity flow energy storage systems; According to the hillside terrain, multiple wheel-driven load-bearing rope-type gravity flow energy storage systems are installed in parallel in the horizontal direction, and / or, according to the hillside terrain, multiple wheel-driven load-bearing rope-type gravity flow energy storage systems are stacked in the vertical direction.

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