Wheel drive carrying cable type gravity flow energy storage system and energy storage method

Abstract

The application relates to the technical field of gravity energy storage, in particular to a wheel-driven carrying cable type gravity flow energy storage system and an energy storage method. The system comprises a carrying cable type carrying subsystem, an upper stockyard, a lower stockyard 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 one-to-one correspondence with two driving wheels / reversing wheels in transmission cooperation, and opposite ends of the energy storage block carrying units are in one-to-one correspondence with the two carrying cables in fixed connection; the method comprises continuously moving each energy storage block from the lower stockyard to the upper stockyard to realize energy storage charging, and driving the energy conversion unit to continuously convert gravity potential energy into electric energy to realize energy release discharging. The application aims to solve at least one technical problem in the background art, and provides a wheel-driven carrying cable type gravity flow energy storage system and an energy storage method.

Description

TECHNICAL FIELD

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

[0002] In recent years, the demand for electricity has maintained a steady growth trend, and the characteristics of peak load have become increasingly prominent. However, the supply of coal and natural gas is tight, and the price continues to be at a high level, and the operation of thermal power enterprises is difficult, coupled with the double control of energy consumption and the uncertainty of hydropower output, and the electricity supply in some areas is tight. Therefore, new power generation technologies such as wind power and photovoltaic have emerged, and their proportion in energy utilization is also gradually increasing. However, renewable energy dominated by wind power and photovoltaic has the characteristics of randomness, volatility and intermittency, and is an unstable energy source that cannot fully meet social electricity demand. Therefore, it is necessary to use energy storage systems to regulate the demand for power generation and electricity. The current energy storage forms include gravity type energy storage, electrochemical energy storage, chemical energy storage, thermal energy storage and other forms. 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 type energy storage have high requirements for terrain and space, and are difficult to be widely deployed. Therefore, gravity energy storage based on high drop has gradually attracted attention. The existing gravity energy storage system generally uses large loads to be lifted one by one to realize energy storage and energy release, which makes the gravity energy storage system have certain requirements for environmental factors such as terrain when implemented, thereby limiting the promotion and application of the gravity energy storage system technology. SUMMARY

[0003] The present application aims to solve at least one technical problem involved in the background art, and provides a wheel-driven carrying cable type gravity flow energy storage system and an energy storage method.

[0004] In order to achieve the above-mentioned purpose, the following technical solutions are adopted in the present application:

[0005] One aspect of the present application provides a wheel-driven carrying cable type gravity flow energy storage system, which comprises a carrying cable type carrying subsystem, an upper stockyard, a lower stockyard 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;

[0006] The driving wheel unit comprises two driving wheels arranged coaxially, the driving wheels are vertically arranged, and the two carrying cables are in one-to-one transmission cooperation with the two driving wheels; the reversing wheel unit comprises two reversing wheels arranged coaxially, the reversing wheels are vertically arranged, and the two carrying cables are in one-to-one transmission cooperation with the two reversing wheels; 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 horizontally arranged;

[0007] The opposite ends of the energy storage block carrying unit are fixedly connected with the two carrying ropes respectively; the energy storage block carrying units are uniformly distributed along the carrying ropes; the energy storage block carrying units are used to move along the clockwise track with the carrying ropes and are also used to move along the counterclockwise track with the carrying ropes; the energy conversion unit is in transmission connection with the driving wheel unit, so that energy storage is realized by moving the energy storage blocks from the lower stockyard to the upper stockyard, and energy release is realized by moving the energy storage blocks from the upper stockyard to the lower stockyard.

[0008] Optionally, the energy storage block carrying unit comprises a carrying vehicle and an even number of rope connecting assemblies installed on the carrying vehicle; the rope connecting assemblies are symmetrically distributed on both sides of the carrying vehicle, and the carrying vehicle is fixedly connected with the carrying ropes through the symmetrically arranged at least two rope connecting assemblies.

[0009] The beneficial effects of the technical solution are that, compared with the detachable installation between the rope connecting assembly and the rope in the existing gravity energy storage system, the rope connecting assembly is fixedly connected with the carrying rope in the embodiment of the application, which not only has a simple structure, but also does not need to frequently open and close the rope connecting assembly to connect and separate the rope connecting assembly and the carrying rope, thereby improving the reliability of the connection between the rope connecting assembly and the carrying rope and reducing the maintenance cost; at the same time, since the rope connecting assembly bears a large load, at least two rope connecting assemblies are arranged on both sides of the carrying vehicle, which can not only improve the carrying capacity of the energy storage block carrying unit, but also improve the reliability of the energy storage block carrying unit.

[0010] Optionally, the rope connecting assembly comprises a fixed connection end, a jaw is formed on the fixed connection end, the fixed connection end partially covers the carrying rope through the jaw in the circumferential direction of the carrying rope, and the jaw is perpendicular to the extension direction of the carrying rope.

[0011] The beneficial effects of the technical solution are that, in this way, the carrying rope is partially covered by the fixed connection end at the position where the rope connecting assembly is arranged, so that the part of the carrying rope not covered by the fixed connection end can be in pressure contact with the outer periphery of the driving wheel unit when passing through the driving wheel unit and can be in pressure contact with the outer periphery of the reversing wheel unit when passing through the reversing wheel unit, so that the setting of the rope connecting assembly does not easily hinder the pressure contact of the carrying rope with the driving wheel unit and the reversing wheel unit in the case of reliable connection between the rope connecting assembly and the carrying rope.

[0012] Optionally, the carrying vehicle comprises a vehicle body and an energy storage block connecting body, the energy storage block connecting body and the rope connecting assembly are installed on the vehicle body, and the energy storage block connecting body is detachably connected with the energy storage block.

[0013] The beneficial effects of the technical solution are that the energy storage blocks can be loaded and unloaded on the carrier vehicle.

[0014] Optionally, the vehicle body comprises a hanger shaft and two mounting plates arranged perpendicularly 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 respectively, the mounting plates are fixed with the rope connection assemblies of the carrier vehicle in the first direction, and the energy storage block connecting body is mounted on the hanger shaft.

[0015] The beneficial effects of the technical solution are that the mounting plates can pivot relative to the energy storage block connecting body mounted on the hanger shaft. When the energy storage block connecting body is fixed with the energy storage blocks, the mounting plates can also pivot relative to the energy storage blocks. When the carrier vehicle moves to the driving wheel unit or the reversing wheel unit, the mounting plates are flipped along the outer periphery of the driving wheel unit or the reversing wheel unit. Since the mounting plates can pivot relative to the energy storage block connecting body, the energy storage block connecting body does not flip under the action of gravity when the mounting plates flip. When the energy storage block connecting body is loaded with the energy storage blocks, the energy storage blocks also do not flip with the mounting plates. When the carrier vehicle passes through the driving wheel unit and the reversing wheel unit, the energy storage block connecting body and the energy storage blocks do not need to make large-range flipping and reversing movements, thereby reducing the impact of the energy storage block connecting body and the energy storage blocks on the carrier rope-type carrying subsystem when reversing, reducing the damage to the carrier rope-type carrying subsystem, and improving the safety, stability and reliability of the gravitational flow energy storage system.

[0016] Optionally, the rope connection assemblies on the same side of the vehicle body in the first direction are arranged along the extension direction of the carrier rope.

[0017] Optionally, a first matching groove is arranged on the outer periphery of the driving wheel, the first matching groove extends along the circumferential direction of the driving wheel; a second matching groove is arranged on the outer periphery of the reversing wheel, the second matching groove extends along the circumferential direction of the reversing wheel; the first matching groove and the second matching groove are matched with the carrier rope, a lining made of friction material is arranged in the first matching groove and the second matching groove, and the lining is in pressure contact with the carrier rope.

[0018] The beneficial effects of the technical solution are that the first matching groove and the second matching groove can effectively limit the carrier rope, so that the carrier rope is not easy to slip off the first matching groove and the second matching groove, and the lining in pressure contact with the carrier rope can improve the ability to transmit power between the driving wheel, the carrier rope and the reversing wheel, so that the driving wheel and the reversing wheel are not easy to slip with the carrier rope.

[0019] Optionally, the energy conversion unit is configured to drive the two driving wheels to rotate synchronously, or the energy conversion unit is configured to drive the two driving wheels to rotate respectively.

[0020] The energy conversion unit can drive the two driving wheels to rotate, and then drive the two carrying cables 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 respectively by the energy conversion unit. In the embodiment of the present application, the energy conversion unit driving the two driving wheels to rotate respectively includes driving the two driving wheels to rotate respectively, and then driving the two driving wheels to rotate synchronously. At this time, the synchronization of the two driving wheels can be realized by electrical control or other methods.

[0021] Optionally, the energy conversion unit comprises a motor and a generator which are both in transmission connection with the driving wheel unit; or the energy conversion unit is a motor-generator.

[0022] The motor is driven to rotate by electric energy in the energy storage charging process, and the energy storage block carrying unit carrying the energy storage blocks is driven to move from the bottom to the top by the driving wheel unit, the reversing wheel unit and the carrying cable. In the energy release and discharge process, the energy storage block carrying unit carrying the energy storage blocks moves from the top to the bottom due to gravity, and at the same time, the generator is driven to generate electricity by the driving wheel unit, realizing the conversion of gravitational potential energy into electric energy. In the energy storage charging process, the motor-generator is driven to rotate by electric energy, and the energy storage block carrying unit carrying the energy storage blocks is driven to move from the bottom to the top by the driving wheel unit, the reversing wheel unit and the carrying cable. In the energy release and discharge process, the energy storage block carrying unit carrying the energy storage blocks moves from the top to the bottom due to gravity, and at the same time, the motor-generator is driven to rotate reversely by the driving wheel unit, realizing the conversion of gravitational potential energy into electric energy.

[0023] Optionally, the wheel-driven carrying cable type gravitational flow energy storage system provided by the present application comprises a plurality of the carrying cable type carrying subsystems, and each of the carrying cable type carrying subsystems is arranged horizontally or longitudinally.

[0024] Another aspect of the present application provides an energy storage method applied to the wheel-driven carrying cable type gravitational flow energy storage system provided by the present application, and the method comprises the following steps:

[0025] In the energy storage charging phase, 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 cables and the two reversing wheels in the reversing wheel unit to rotate, and then drive each of the energy storage block carrying units to move, so as to continuously move each of the energy storage blocks from the lower stockyard to the upper stockyard.

[0026] In the energy release and discharge phase, each of the energy storage blocks on the upper stacking yard is sequentially loaded into each of the energy storage block carrying units, and continuously moves from the upper stacking yard to the lower stacking yard under the action of gravity, thereby driving the driving wheels in the driving wheel unit to rotate to drive the energy conversion unit to continuously convert the gravitational potential energy into electrical energy.

[0027] Optionally, the method comprises: the energy storage blocks can correspond to the energy storage block carrying units, or can be spaced apart from the energy storage block carrying units, and the energy storage block carrying units can be adjusted in following speed of the carrying cable, so as to realize adjustable gravitational flow.

[0028] The technical scheme has the beneficial effects that: the "slow charging and fast discharging" or "on-demand charging and discharging" function is further realized, so that the wheel-driven carrying cable type gravitational flow energy storage system and energy storage method provided by the application can be applied to more scenarios, and is further promoted and applied.

[0029] The technical scheme provided by the application can achieve at least one of the following beneficial effects:

[0030] The wheel-driven carrying cable type gravitational flow energy storage system and energy storage method provided by the application adopts two carrying cables to jointly carry and pull the energy storage block carrying units loaded with energy storage blocks, and has stronger carrying capacity than the existing gravitational energy storage system which only adopts one carrying cable to carry and pull the energy storage blocks. In this way, according to the geographical environment of the construction site, the number of support structures (such as columns) arranged between the upper stacking yard and the lower stacking yard can be appropriately reduced, or even no support structure needs to be arranged between the upper stacking yard and the lower stacking yard, thereby reducing the requirement of the gravitational flow energy storage system on the geographical environment, improving the adaptability of the gravitational flow energy storage system to the geographical environment, and making the gravitational flow energy storage system easier to promote and apply; and, compared with the traditional gravitational energy storage system in which the rollers serving as driving members and reversing members are arranged horizontally, the rollers are arranged vertically in the axial direction. In the application, the axial direction of the driving wheel unit and the axial direction of the reversing wheel unit are both arranged horizontally, thereby realizing horizontal layout and saving the demand for planar space.

[0031] The additional technical features of the application and their advantages will be more apparent in the following description or can be understood through specific implementation of the application. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical scheme of the specific embodiments of the application, the following will briefly introduce the drawings needed in the description of the specific embodiments. Obviously, the drawings in the following description are some embodiments of the application, and those skilled in the art can also obtain other drawings according to these drawings without creating any inventive labor.

[0033] Figure 1Part structure schematic diagram of one embodiment of the wheel driving carrying cable type gravity flow energy storage system provided by the embodiment of the present application;

[0034] Figure 2 Structure schematic diagram of the assembly of one embodiment of the driving wheel unit provided by the embodiment of the present application and the energy conversion unit;

[0035] Figure 3 Part structure schematic diagram of one embodiment of the carrying cable type carrying subsystem provided by the embodiment of the present application;

[0036] Figure 4 Structure schematic diagram of one embodiment of the energy storage block carrying unit provided by the embodiment of the present application loaded with energy storage blocks;

[0037] Figure 5 Structure schematic diagram of one embodiment of the rope connection assembly provided by the embodiment of the present application.

[0038] Reference signs:

[0039] 01, reversing wheel unit; 02, rope guide unit;

[0040] 03, carrying cable; 04, energy storage block;

[0041] 05, energy storage block carrying unit; 06, driving wheel unit;

[0042] 07, energy conversion unit; 08, driving wheel;

[0043] 09, first connecting shaft; 10, first matching groove;

[0044] 11, hanger rotating shaft; 12, rope connection assembly;

[0045] 13, mounting plate; 14, energy storage block connecting body;

[0046] 15, fixed connection end; 16, jaw;

[0047] 17, support seat; 18, reversing wheel;

[0048] 19, second connecting shaft; 20, second matching groove. DETAILED DESCRIPTION

[0049] The technical solutions of the present application will be described clearly and completely below in combination with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0050] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0051] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0052] Currently, remote areas such as mountainous or hilly regions often experience severe power shortages, making the deployment of gravity energy storage systems even more crucial. However, these areas typically have complex terrain and steep slopes, hindering the implementation and widespread adoption of large-scale systems. Furthermore, to support substantial loads, existing gravity energy storage systems often require numerous support structures along the load's path. Constructing these support structures in mountainous or hilly areas, on steep slopes or in rugged terrain, is generally challenging and difficult, limiting the promotion and application of gravity energy storage technology.

[0053] like Figures 1 to 5 As shown, one aspect of this application provides a wheel-driven carrier cable gravity flow energy storage system including a carrier cable subsystem, an upper storage yard, a lower storage yard, and multiple energy storage blocks 04; the carrier cable subsystem includes an energy conversion unit 07, a drive wheel unit 06, a reversing wheel unit 01, multiple energy storage block carrier units 05, and two carrier cables 03;

[0054] The drive wheel unit 06 includes two coaxially arranged drive wheels 08, which are vertically arranged. The two transport cables 03 are correspondingly connected to the two drive wheels 08 for transmission. The reversing wheel unit 01 includes two coaxially arranged reversing wheels 18, which are vertically arranged. The two transport cables 03 are correspondingly connected to the two reversing wheels 18 for transmission. The axial directions of the drive wheels 08 and the reversing wheels 18 are both parallel to a first direction, and the first direction is horizontally arranged.

[0055] The opposite ends of the energy storage block carrying unit 05 are fixedly connected with two carrying cables 03 correspondingly; the energy storage block carrying units 05 are uniformly distributed along the carrying cables 03; the energy storage block carrying units 05 are used to move along a clockwise track with the carrying cables 03, and are also used to move along an anticlockwise track with the carrying cables 03; the energy conversion unit 07 is drivingly connected with the driving wheel unit 06, so as to realize energy storage by moving the energy storage blocks 04 from the lower stockyard to the upper stockyard, and to realize energy release by moving the energy storage blocks 04 from the upper stockyard to the lower stockyard.

[0056] In the embodiment of the present application, the observation angles of the clockwise and the anticlockwise should be the same, and according to the different setting modes of the carrying cable type carrying subsystem, the positions of the clockwise and the anticlockwise observed are generally different, the clockwise and the anticlockwise represent the moving directions, and the corresponding moving tracks can be similar to the shape of the edge of a waist-shaped hole, a circle or an ellipse, etc.; 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.

[0057] It can be understood that the two driving wheels 08 are mirror-symmetrically arranged, and the two reversing wheels 18 are mirror-symmetrically arranged; the carrying cable 03 provided in the embodiment of the present application has both the function of pulling the weight and the function of bearing the weight.

[0058] The wheel-driven carrying cable type gravity flow energy storage system provided in the application adopts two carrying cables 03 to jointly carry and pull the energy storage block carrying unit 05 loaded with energy storage blocks 04. Compared with the existing gravity energy storage system which only adopts one carrying cable 03 to realize carrying and pulling of the energy storage blocks 04, the carrying capacity is stronger. In this way, according to the geographical environment of the construction site, the number of support structures (such as columns and the like) arranged between the upper stockyard and the lower stockyard can be appropriately reduced, or even no support structure needs to be arranged between the upper stockyard and the lower stockyard, thereby reducing the requirements of the gravity flow energy storage system on the terrain environment, improving the adaptability of the gravity flow energy storage system to the geographical environment, and making the gravity flow energy storage system easier to popularize 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 cable device) independent of the traction cable to carry the energy storage block carrying unit 05 and the energy storage blocks 04. The carrying device often has a large weight and needs to be supported by an additional support structure, which also limits the popularization and application of the gravity energy storage system in mountainous areas, hilly areas or other complex terrains. The wheel-driven carrying cable type gravity flow energy storage system provided in the application adopts double carrying cables 03 to realize carrying and pulling of the energy storage block carrying unit 05 and the energy storage blocks 04, without the need for a carrying device independent of the traction cable, thereby reducing the number of support structures required, or even without the need for a support structure, and the structure is simpler, improving the convenience of construction, further reducing the requirements of the gravity flow energy storage system on the terrain environment, improving the adaptability of the gravity flow energy storage system to the geographical environment, and making the gravity flow energy storage system easier to popularize and apply. Moreover, the existing gravity energy storage system which adopts a single carrying cable 03 to transport energy storage blocks 04 has poor stability and is prone to swinging and shaking of the energy storage blocks 04 during movement. In particular, in mountainous areas, hilly areas and other relatively open areas, the wind speed is usually large, which aggravates the degree of swinging and shaking of the energy storage blocks 04 during movement, and has a large safety hazard.The wheel driving carrying cable type gravity flow energy storage system provided in the application connects the two ends of the energy storage block carrying unit 05 one by one with two carrying cables 03, and the two carrying cables 03 can provide the energy storage block carrying unit 05 with a torque resisting swing and sway, reduce the degree of swing and sway of the energy storage block carrying unit 05 (whether loaded with the energy storage block 04 or not), and can operate more stably and has less safety hazards when applied to mountainous areas, hilly areas and other wide areas with large wind speed. Moreover, the wheel driving carrying cable type gravity flow energy storage system provided in the application connects the two ends of the energy storage block carrying unit 05 one by one with two carrying cables 03, which reduces the load strength of the single carrying cable 03 compared with the existing gravity energy storage system using a single carrying cable 03 to transport the energy storage block 04, effectively avoids the single-point overload risk on the carrying cable 03, and improves the safety margin of system operation. The wheel driving carrying cable type gravity flow energy storage system provided in the application connects the two ends of the energy storage block carrying unit 05 one by one with two carrying cables 03, which improves the maximum carrying capacity compared with the existing gravity energy storage system using a single carrying cable 03 to transport the energy storage block 04, and further makes the energy storage and power generation state operate efficiently, so that high-power storage and release of electric energy can be realized. At the same time, since each energy storage block carrying unit 05 can move in circulation with the carrying cable 03, each energy storage block carrying unit 05 can continuously transport the energy storage block 04, and further form a continuous gravity flow, which provides conditions for forming a stable energy flow and continuous discharge. Moreover, compared with the traditional gravity energy storage system in which the roller serving as a driving member and a reversing member is arranged horizontally and the roller shaft is arranged vertically, the shaft direction of the driving wheel unit 06 and the shaft direction of the reversing wheel unit 01 are both arranged horizontally in the embodiment of the application, and thus horizontal layout is realized to save planar space requirement.

[0059] As Figure 4As shown, optionally, the energy storage block carrying unit 05 comprises a carrying vehicle and an even number of rope connecting assemblies 12 installed on the carrying vehicle; each of the rope connecting assemblies 12 is symmetrically distributed on the two sides of the carrying vehicle, and the carrying vehicle is fixedly connected with the carrying cable 03 through at least two symmetrically arranged rope connecting assemblies 12. Compared with the detachable installation between the rope connecting assembly 12 and the rope in the existing gravity energy storage system, the rope connecting assembly 12 is fixedly connected with the carrying cable 03 in the embodiment of the application, which not only has a simple structure, but also does not need to frequently open and close the rope connecting assembly 12 to connect and separate the rope connecting assembly 12 and the carrying cable 03, thereby improving the reliability of the connection between the rope connecting assembly 12 and the carrying cable 03 and reducing the maintenance cost. At the same time, since the rope connecting assembly 12 bears a large load, at least two rope connecting assemblies 12 are arranged on the two sides of the carrying vehicle, which can not only improve the carrying capacity of the energy storage block carrying unit 05, but also improve the reliability of the energy storage block carrying unit 05. Of course, at least two rope connecting assemblies 12 can also be arranged on one side of the carrying vehicle, one rope connecting assembly 12 can be arranged on the other side of the carrying vehicle, or only one rope connecting assembly 12 can be arranged on the two sides of the carrying vehicle.

[0060] As shown, Figure 5 As shown, optionally, the rope connecting assembly 12 comprises a fixed connection end 15, a jaw 16 is formed on the fixed connection end 15, the fixed connection end 15 partially covers the carrying cable 03 through the jaw 16 in the circumferential direction of the carrying cable 03, and the jaw 16 is perpendicular to the extension direction of the carrying cable 03. In this way, the carrying cable 03 at the position provided with the rope connecting assembly 12 is partially covered by the fixed connection end 15, so that the part of the carrying cable 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 in pressure contact with the outer periphery of the reversing wheel unit 01 when passing through the reversing wheel unit 01, so that the setting of the rope connecting assembly 12 does not easily hinder the pressure contact of the carrying cable 03 with the driving wheel unit 06 and the reversing wheel unit 01 in the case of reliable connection between the rope connecting assembly 12 and the carrying cable 03. Of course, the fixed connection end 15 can also 360° cover the carrying cable 03 at the corresponding position, or the detachable installation between the rope connecting assembly 12 and the carrying cable 03 can be realized.

[0061] Optionally, the carrying vehicle comprises a vehicle body and an energy storage block connecting body 14, the energy storage block connecting body 14 and the rope connecting assembly 12 are both installed on the vehicle body, and the energy storage block connecting body 14 is detachably connected with the energy storage block 04. Further, loading and unloading the energy storage block 04 on the carrying vehicle can be realized.

[0062] Optionally, the vehicle body comprises a hanger shaft 11 and two mounting plates 13 arranged perpendicularly to the hanger shaft 11, the axial direction of the hanger shaft 11 is parallel to the first direction, and the two mounting plates 13 are pivotally connected to the two ends of the hanger shaft 11 respectively, the mounting plates 13 are fixed with the rope connecting assemblies 12 of the carrier vehicle in the first direction, and the energy storage block connecting body 14 is mounted on the hanger shaft 11. In this way, the mounting plates 13 can pivot relative to the energy storage block connecting body 14 mounted on the hanger shaft 11, and when the energy storage block connecting body 14 is fixed with the energy storage block 04, the mounting plates 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 plates 13 are flipped along the outer periphery of the driving wheel unit 06 or the reversing wheel unit 01. Since the mounting plates 13 can pivot relative to the energy storage block connecting body 14, the energy storage block connecting body 14 does not flip under the action of gravity when the mounting plates 13 flip, and when the energy storage block connecting body 14 is loaded with the energy storage block 04, the energy storage block 04 does not flip with the mounting plates 13. When the carrier vehicle passes through the driving wheel unit 06 and the reversing wheel unit 01, the energy storage block connecting body 14 and the energy storage block 04 do not need to make large-range flipping and reversing movements, thereby reducing the impact of the energy storage block connecting body 14 and the energy storage block 04 on the carrier cable carrier subsystem when reversing, reducing the damage to the carrier cable carrier subsystem, and improving the safety, stability and reliability of the operation of the gravity flow energy storage system. In the embodiment of the application, the energy storage block connecting body 14 can be fixedly connected with the hanger shaft 11, and the energy storage block connecting body 14 can also be pivotally connected with the hanger shaft 11; the mounting plates 13 are preferably arranged perpendicularly to the hanger shaft 11.

[0063] Optionally, each of the rope connecting assemblies 12 located on the same side of the vehicle body in the first direction is arranged along the extension direction of the carrier cable 03. That is, each of the rope connecting assemblies 12 located on the same side is arranged along the extension direction of the corresponding side of the carrier cable 03. Of course, more than three rope connecting assemblies 12 can also be arranged on each side of the vehicle body in the first direction, and each of the rope connecting assemblies 12 can also be arranged in a wave shape.

[0064] As Figure 2 and Figure 3As shown, optionally, a first matching groove 10 is arranged on the outer periphery of the driving wheel 08, and extends along the circumference of the driving wheel 08; a second matching groove 20 is arranged on the outer periphery of the reversing wheel 18, and extends along the circumference of the reversing wheel 18; the first matching groove 10 and the second matching groove 20 are matched with the carrying cable 03, and a lining made of friction material is arranged in the first matching groove 10 and the second matching groove 20, and the lining is in pressure contact with the carrying cable 03. The first matching groove 10 and the second matching groove 20 can effectively limit the carrying cable 03, so that the carrying cable 03 is not easy to slide off from the first matching groove 10 and the second matching groove 20, and the pressure contact between the lining and the carrying cable 03 can improve the power transmission capacity between the driving wheel 08, the carrying cable 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 cable 03.

[0065] 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 respectively. In this way, the energy conversion unit 07 can drive the two driving wheels 08 to rotate, and then drive the two carrying cables 03 and the two reversing wheels 18 to rotate. In the embodiment of the application, the two driving wheels 08 can be driven synchronously by the energy conversion unit 07, or the energy conversion unit 07 can drive the two driving wheels 08 to rotate respectively. In the embodiment of the application, the energy conversion unit 07 drives the two driving wheels 08 to rotate respectively, which includes that the energy conversion unit 07 drives the two driving wheels 08 to rotate respectively, and then drives the two driving wheels 08 to rotate synchronously, at this time, the synchronous rotation of the two driving wheels 08 can be realized 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.

[0066] Optionally, the energy conversion unit 07 comprises a motor and a generator, both of which are in transmission connection with the driving wheel unit 06. In this way, during the energy storage charging process, the motor is driven to rotate by electric energy, and the energy storage block carrying unit 05 carrying the energy storage block 04 is driven to move upward from the lower position to the upper position by the driving wheel unit, the reversing wheel unit and the carrying cable. During the energy release and discharging process, the energy storage block carrying unit 05 carrying the energy storage block 04 moves downward from the upper position to the lower position due to gravity. At the same time, the generator is driven to generate electricity by the driving wheel unit, so as to realize the conversion of gravitational potential energy into electric energy. Alternatively, the energy conversion unit 07 is a motor-generator. In this way, during the energy storage charging process, the motor-generator is driven to rotate by electric energy, and the energy storage block carrying unit 05 carrying the energy storage block 04 is driven to move upward from the lower position to the upper position by the driving wheel unit, the reversing wheel unit and the carrying cable. During the energy release and discharging process, the energy storage block carrying unit 05 carrying the energy storage block 04 moves downward from the upper position to the lower position due to gravity, and the generator is driven to rotate reversely by the driving wheel unit, so as to realize the conversion of gravitational potential energy into electric energy.

[0067] Optionally, the wheel-driven carrying cable type gravitational flow energy storage system provided in the embodiments of the present application comprises a plurality of the carrying cable type carrying subsystems, and each of the carrying cable type carrying subsystems is arranged transversely or longitudinally.

[0068] The carrying cable type carrying subsystem provided in the present application further comprises a rope guide unit 02, and the rope guide unit 02 is arranged at a position close to the corresponding upper stockyard and lower stockyard, and the extension direction of the carrying cable 03 changes from inclined extension to horizontal extension or approximate horizontal extension at the rope guide unit 02.

[0069] The driving wheel unit 06 and the reversing wheel unit 01 further comprise a support seat 17 and the like.

[0070] Another aspect of the present application provides an energy storage method, which is applied to the wheel-driven carrying cable type gravitational flow energy storage system provided in the embodiments of the present application, and the method comprises the following steps:

[0071] During the energy storage charging process, the energy conversion unit 07 drives two driving wheels 08 in the driving wheel unit 06 to rotate, and the two driving wheels 08 drive two reversing wheels 18 in the reversing wheel unit 01 and the carrying cable 03 to rotate, so as to drive the energy storage block carrying unit 05 to move, so that each energy storage block 04 is continuously moved from the lower stockyard to the upper stockyard.

[0072] During the energy release and discharging process, each energy storage block 04 on the upper stockyard is loaded on the energy storage block carrying unit 05 in sequence, and continuously moves from the upper stockyard to the lower stockyard under the action of gravity, so as to drive the carrying cable 03 and two driving wheels 08 in the driving wheel unit 06 to rotate, so as to drive the energy conversion unit 07 to continuously convert the gravitational potential energy into electric energy.

[0073] Specifically, in one embodiment of the present application, the energy storage stage: in the energy storage process, the energy conversion unit 07 plays a core role in energy conversion, which draws electric energy from the power grid and converts it into kinetic energy. The kinetic energy is then smoothly transmitted to the drive wheel 08, driving it to rotate in a clockwise direction. The drive wheel 08 drives the carrier cable 03 to start moving by virtue of the friction between its surface and the carrier cable 03. This movement is then transmitted to the reversing wheel 18, also driving it to rotate in a clockwise direction. As the carrier cable 03 continues to move, the carrier vehicle clamped on it is pulled forward. The carrier vehicle is equipped with a hanger shaft 11 and an energy storage block connecting body 14, which hoist the energy storage block 04 in the lower yard to move with the carrier vehicle. When approaching the upper yard, the energy storage block 04 is separated from the hanger shaft 11 and the energy storage block connecting body 14 on the carrier vehicle, and is sent into the upper yard and quickly transported away by the transfer vehicle for storage. The carrier vehicle continues to travel along the carrier cable 03, preparing to start a new round of energy storage block 04 transportation task.

[0074] The discharge stage: in the discharge process, the energy storage block 04 in the upper yard is brought into the carrier cable 03 by the transfer vehicle. Here, the energy storage block 04 is fixed by the energy storage block connecting body 14 on the carrier vehicle. Then, under the action of gravity, the energy storage block 04 slides down the carrier cable 03 with the carrier vehicle, releasing the energy contained. The carrier vehicle drives the carrier cable 03 to start moving through its clamping force. The carrier cable 03 transmits the movement to the drive wheel 08 and the reversing wheel 18 through its friction, 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, converting kinetic energy into electric energy and inputting it into the power grid. When approaching the lower yard, the energy storage block 04 is separated from the energy storage block connecting body 14 on the carrier vehicle, and is sent into the lower yard and transported away by the transfer vehicle for storage. The carrier vehicle continues to travel along the carrier cable 03. Finally, the carrier vehicle returns to the upper yard, preparing to start a new round of energy storage block 04 transportation task.

[0075] The energy storage method provided by the present application is applied to the wheel-driven carrier cable type gravity flow energy storage system provided by the present application, which adopts two carrier cables 03 to jointly carry and pull the energy storage block carrier unit 05 loaded with the energy storage block 04. Compared with the existing gravity energy storage system which only adopts one carrier cable 03 to realize carrying and pulling 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 support structures (such as columns) arranged between the upper yard and the lower yard can be appropriately reduced, or even no support structure needs to be arranged between the upper yard and the lower yard, thereby reducing the requirement of the gravity flow energy storage system on the geographical environment, improving the adaptability of the gravity flow energy storage system to the geographical environment, and making the gravity flow energy storage system easier to popularize and apply.

[0076] Optionally, the method comprises: the energy storage block 04 can correspond to the energy storage block carrying unit 05, and can be spaced apart from the energy storage block carrying unit 05. The energy storage block carrying unit 05 can follow the running speed of the carrying cable 03 and be adjustable, so as to realize adjustable gravity flow, and further realize the functions of "slow charging and fast discharging" or "charging and discharging on demand". In this way, the wheel-driven carrying cable type gravity flow energy storage system and the energy storage method provided by the application can be applied to more scenarios, and further popularized and applied.

[0077] In the embodiments of the application, an application example of the wheel-driven carrying cable type gravity flow energy storage system and the energy storage method is also provided, and the application example is as follows:

[0078] The energy storage block 04 is mainly made of reinforced concrete, and the density is 2,500 kg / m 3 . The outer shape is a rectangular cuboid with a length of 1.2 meters, a width of 1.2 meters, and a height of 1.0 meter, and the weight is 3.6 tons. Assuming that the hill is 500 meters high, the single energy storage block 04 is lifted from the bottom of the hill to the top of the hill, and the stored energy E=mgh=3.6×103 kg×9.8 m / s 2 ×500 m=17,640,000 J=4.9 kWh. Referring to the running speed of the passenger cableway, the freight cableway, the mine hoist and other equipment, the speed of the traction cable is 6 meters per second, and then 21.6 kilometers can be run 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 hill per hour, and 2160×4.9 kWh / each=10584.0 kW•h≈10.6 MWh of energy can be stored per hour. Considering the system friction loss and other factors, the comprehensive power generation per hour is calculated as 10.6 MWh×85%≈9.0 MWh. In order to improve the power generation capacity, multiple systems can be arranged in parallel; or the speed of the traction rope can be increased.

[0079] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the application, but not to limit them; although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the application.

Claims

1. A wheel-driven cable-type gravity flow energy storage system, characterized in that, It includes a cable-mounted transport subsystem, an upper storage yard, a lower storage yard, and multiple energy storage blocks; the cable-mounted transport subsystem includes an energy conversion unit, a drive wheel unit, a commutator wheel unit, multiple energy storage block transport units, and two transport cables; The drive wheel unit includes two coaxially arranged drive wheels, which are vertically positioned, and the two transport cables are correspondingly driven by the two drive wheels; the reversing wheel unit includes two coaxially arranged reversing wheels, which are vertically positioned; the two transport cables are correspondingly driven by the two reversing wheels; the axial directions of the drive wheels and the reversing wheels are both parallel to a first direction, and the first direction is horizontal; Each of the energy storage block carrier units is fixedly connected to one of the two carrier cables at its opposite ends; each energy storage block carrier unit is evenly distributed along the carrier cables; each energy storage block carrier unit is used to move cyclically along a clockwise trajectory with the carrier cables, and each energy storage block carrier unit is also used to move cyclically along a counterclockwise trajectory with the carrier cables; the energy conversion unit is driven by the drive wheel unit to achieve energy storage by moving the energy storage block from the lower storage yard to the upper storage yard, and to achieve energy release by moving the energy storage block from the upper storage yard to the lower storage yard; The energy storage block transport unit includes a transport vehicle and an even number of rope connection assemblies installed on the transport vehicle; each of the rope connection assemblies is symmetrically distributed on both sides of the transport vehicle, and the transport vehicle is fixedly connected to the transport cable through at least two symmetrically arranged rope connection assemblies; the transport vehicle includes a vehicle body and an energy storage block connector, both the energy storage block connector and the rope connection assemblies are installed on the vehicle body, and the energy storage block connector is detachably connected to the energy storage block; the vehicle body includes a hanger shaft and two mounting plates arranged perpendicular to the hanger shaft, the axis 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-to-one, the rope connection assemblies of the transport vehicle are fixed on the mounting plates in the first direction, and the energy storage block connector is installed on the hanger shaft; When the vehicle moves to the drive wheel unit, the mounting plate flips along the outer periphery of the drive wheel unit. When the vehicle moves to the reversing wheel unit, the mounting plate flips along the outer periphery of the reversing wheel unit. When the mounting plate flips, the energy storage block connector does not flip under the action of gravity. The rope connection assembly includes a fixed connection end with jaws formed thereon. The fixed connection end covers the transport rope in the circumferential direction of the transport rope through the jaws. The jaws are oriented perpendicular to the extension direction of the transport rope, so that the portion of the transport rope not covered by the fixed connection end can make pressure contact with the outer circumference of the drive wheel unit when passing through the drive wheel unit, and can make pressure contact with the outer circumference of the reversing wheel unit when passing through the reversing wheel unit.

2. The wheel-driven cable-type gravity flow energy storage system according to claim 1, characterized in that, 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 transport cable.

3. The wheel-driven cable-type gravity flow energy storage system according to claim 1, characterized in that, A first mating groove is provided on the outer periphery of the drive wheel, and the first mating groove extends along the circumference of the drive wheel; a second mating groove is provided on the outer periphery of the reversing wheel, and the second mating groove extends along the circumference of the reversing wheel; both the first mating groove and the second mating groove mate with the transport cable, and a pad made of friction material is provided in both the first mating groove and the second mating groove, and the pad is in pressure contact with the transport cable.

4. The wheel-driven cable-type gravity flow energy storage system according to claim 1, characterized in that, The energy conversion unit is used to drive the two drive wheels to rotate synchronously, or the energy conversion unit is used to drive the two drive wheels to rotate separately.

5. The wheel-driven cable-type 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 connected to the drive wheel unit in a transmission manner; or, the energy conversion unit is an electric generator.

6. The wheel-driven cable-type gravity flow energy storage system according to any one of claims 1 to 5, characterized in that, It includes multiple cable-stayed vehicle subsystems, which are arranged laterally or longitudinally.

7. An energy storage method, characterized in that, Applied to the wheel-driven cable gravity flow energy storage system as described in any one of claims 1 to 6, the method comprises: During the energy storage and charging phase, the energy conversion unit drives the two drive wheels in the drive wheel unit to rotate, and the two drive wheels drive the two transport cables and the two reversing wheels in the reversing wheel unit to rotate, thereby driving each energy storage block transport unit to move, so as to continuously move each energy storage block from the lower storage yard to the upper storage yard. During the energy release phase, each of the energy storage blocks on the upper storage yard is sequentially loaded onto the energy storage block carrier unit and continuously moves from the upper storage yard to the lower storage yard under the action of gravity, thereby driving the carrier cable and the drive wheel in the drive wheel unit to rotate, so as to drive the energy conversion unit to continuously convert gravitational potential energy into electrical energy.

8. The energy storage method according to claim 7, characterized in that, include: The energy storage block can correspond to the energy storage block carrier unit, or it can correspond to the energy storage block carrier unit at intervals. The speed of the energy storage block carrier unit following the travel of the carrier cable is adjustable, thereby realizing the adjustment of the gravity flow.

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