High-energy-efficiency slope gravity energy storage system

Abstract

The utility model discloses a high-energy-efficiency slope gravity energy storage system. A low-altitude track, an inclined track and a high-altitude track are connected to form a closed annular track for continuously and circularly running a plurality of track cars; a high-altitude unhooking area is arranged at the input end of the high-altitude track, and a high-altitude rope holding area is arranged at the output end of the high-altitude track; the altitude of the high-altitude unhooking area is higher than that of the high-altitude cable holding area, and the high-altitude track is in a downhill trend; a low-altitude unhooking area is arranged at the input end of the low-altitude track, and a low-altitude rope holding area is arranged at the output end of the low-altitude track; the altitude of the low-altitude unhooking area is higher than that of the low-altitude cable holding area, and the low-altitude track is in a downhill trend; a high-altitude bulk cargo storage and transportation system is arranged in a relatively high-altitude area, and a low-altitude bulk cargo storage and transportation system is arranged in a relatively low-altitude area. According to the scheme, materials can be continuously conveyed, energy storage and power generation output are stable, impact on a power grid is avoided, system loss is effectively reduced, and conversion efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of gravity energy storage power generation, and specifically relates to a high-efficiency slope gravity energy storage system. Background Art

[0002] The gravity energy storage system mainly consists of two parts: energy storage and discharge. When storing energy, materials are lifted from a low-altitude storage yard to a high-altitude storage yard, and the electrical energy is eventually converted into the gravitational potential energy of the materials for temporary storage; when discharging, materials are transported from a high-altitude storage yard to a low-altitude storage yard, and the transmission device drives the generator to generate electricity, and the gravitational potential energy is eventually converted into electrical energy. As a commercial and engineered power project, the success of the gravity energy storage project depends on whether it can provide continuous and stable current, which depends on the weight and speed stability of the lifting weight.

[0003] At present, gravity energy storage, as a new energy storage solution, has no production cases in China, and the first gravity energy storage project in China is under construction. The existing gravity energy storage solutions include mountain (slope) energy storage, which uses the height difference between the upper and lower slopes as a channel for transporting energy storage heavy blocks. There are no actual engineering application cases at home and abroad, but there are several patents, such as the patent "Gravity energy storage system based on rails and cable cars to transport sand" applied by the Institute of Electrical Engineering of the Chinese Academy of Sciences, the patent "A hybrid gravity energy storage system suitable for wind, light and storage combined power generation system" applied by Harbin Institute of Technology, the patent "A solid gravity flow transport energy storage equipment and energy storage system" applied by Wu Yanxi, the patent "A rail transportation gravity energy storage system" applied by Du Wei, the patent "A high-efficiency gravity energy storage system based on a transmission chain" applied by China Electric Power Purui Electric Power Engineering Co., Ltd., and the patent "A continuous charging and discharging rail-type gravity energy storage system and its operation method" applied by Huadian Lanke Technology Co., Ltd. The above patent solution still has some design problems, fails to fully consider the current domestic actual situation, and has low efficiency and stability, and does not have practical engineering application promotion value. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a high-efficiency slope gravity energy storage system to solve the problem that the existing technology cannot achieve continuity, high efficiency and stability, and to use bulk materials as energy storage media. The material can be continuously transported, the energy storage and power generation output are stable, and there will be no impact on the power grid. The system loss is effectively reduced and the conversion efficiency is improved.

[0005] According to the technical solution of the utility model, the utility model provides a high-efficiency slope gravity energy storage system, including an inclined track located on a ramp, a high-altitude track located in a relatively high-altitude area, and a low-altitude track located in a relatively low-altitude area, wherein the low-altitude track, the inclined track, and the high-altitude track are connected to form a closed loop track for continuously circulating a plurality of rail vehicles; a high-altitude detachment zone is provided at the input end of the high-altitude track, and a high-altitude gripping zone is provided at the output end of the high-altitude track; the altitude of the high-altitude detachment zone is higher than that of the high-altitude gripping zone, and the high-altitude track presents a downward trend; a low-altitude detachment zone is provided at the input end of the low-altitude track, and a low-altitude gripping zone is provided at the output end of the low-altitude track; the altitude of the low-altitude detachment zone is higher than that of the low-altitude gripping zone, and the low-altitude track presents a downward trend; a high-altitude bulk material storage and retrieval transportation system is provided in the relatively high-altitude area, and a low-altitude bulk material storage and retrieval transportation system is provided in the relatively low-altitude area; and a traction steel cable arranged in parallel with the inclined track is also provided on the rail vehicle, and a detachment gripping device adapted to the traction steel cable is provided.

[0006] Furthermore, the high-altitude bulk material storage and transportation system includes a high-altitude storage bin and a high-altitude unloading area provided on the high-altitude track near the high-altitude detachment area, and a high-altitude loading area provided on the high-altitude track near the high-altitude gripping area; the low-altitude bulk material storage and transportation system includes a low-altitude storage bin and a low-altitude unloading area provided on the low-altitude track near the low-altitude detachment area; and a low-altitude loading area provided on the low-altitude track near the low-altitude gripping area.

[0007] Furthermore, the high altitude storage bin is located below the high altitude unloading area, and the low altitude storage bin is located below the low altitude unloading area.

[0008] Furthermore, a high-altitude material conveying device is provided between the high-altitude material storage bin and the high-altitude material loading area; and a low-altitude material conveying device is provided between the low-altitude material storage bin and the low-altitude material loading area.

[0009] Furthermore, there are slow-moving curves at the connection between the low-altitude track and the inclined track, as well as at the connection between the high-altitude track and the inclined track.

[0010] Furthermore, the traction cable is connected to a cable driving system; the cable driving system includes a driving turntable and a driven turntable, and the driving turntable and the driven turntable are connected through the traction cable transmission; the traction cable is arranged along the ground.

[0011] Furthermore, the driving turntable is arranged in a relatively high altitude area and is located on the high altitude side of the high altitude detachment area; the driven turntable is arranged in a relatively low altitude area and is located on the low altitude side of the low altitude cable holding area.

[0012] Furthermore, the driving turntable is connected to an electric generator integrated machine.

[0013] Furthermore, the rail vehicle comprises a carriage, wheels are arranged on both sides of the carriage, and a detachable rope gripper is arranged at the bottom of the carriage.

[0014] Furthermore, an openable and closable unloading port is provided at the bottom of the carriage, and / or a loading port is provided above the carriage.

[0015] Compared with the prior art, the beneficial technical effects of the utility model are as follows:

[0016] 1. The high-efficiency slope gravity energy storage system of the utility model is considered from the perspective of power engineering application, while fully considering the use of existing conditions such as abandoned mines, inclined mines, natural mountains, etc. All bulk materials such as tailings, waste ores, sand and gravel can be used as energy storage media, truly achieving the secondary development and utilization of waste and waste ores, meeting the national dual carbon goals, and adapting to the development trend of the overall environment.

[0017] 2. The high-efficiency slope gravity energy storage system of the utility model can continuously transport materials, and the energy storage and power generation output are stable, and will not cause impact on the power grid. The rail car equipped with a towing cable gripper runs at high speed with the traction cable before unhooking, ensuring high-efficiency operation of energy storage and power generation; at the same time, it can run at a slow speed after unhooking, fully ensuring the necessary time interval of the loading and unloading system, thereby ensuring the stability and environmental protection of the system, and effectively overcoming the contradiction in the current patent that the operating efficiency and loading and unloading efficiency cannot be guaranteed at the same time.

[0018] 3. In the high-efficiency slope gravity energy storage system of the utility model, both the high-altitude track and the low-altitude track are downhill. After the railcar enters the high (low) altitude track, it can move by itself under its own gravity without the need for additional drive, which can effectively reduce system losses and improve conversion efficiency. The slope of the high-altitude track and the low-altitude track is closely related to the weight of the railcar and the system's transportation capacity. The running speed of the railcar is controlled by adjusting the slope.

[0019] 4. In the high-efficiency slope gravity energy storage system of the utility model, the traction steel cable is laid along the ground, which can increase the support for the steel wire rope, avoid the phenomenon of the steel wire rope sagging between two supports when the steel wire rope is laid overhead as in the existing patent, resulting in insufficient local traction power or uneven distribution of traction force, and increase the stability of the steel wire rope and its service life.

[0020] 5. The high-efficiency slope gravity energy storage system of the utility model can adjust the effective length of the inclined track according to the needs of the project and actual environmental conditions, and can also adjust the number and size of the rail cars, so as to configure the installed capacity required by the project; in addition, this solution can be modularized according to the actual needs of the project, forming a side-by-side arrangement or continuous relay of multiple gravity energy storage systems to achieve a larger installed capacity. The purpose of gravity energy storage is to store and release electric energy, and the released electric energy is transmitted to the user side through the existing power grid. The released electric energy has higher technical requirements such as voltage and current. Compared with the existing technical solutions (patents), this solution is the only one with engineering promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the main structure according to one embodiment of the utility model.

[0022] Figure 2 yes Figure 1 A schematic diagram of the structure of the embodiment shown is a top view.

[0023] Figure 3 It is a structural schematic diagram of a rail vehicle according to an embodiment of the utility model.

[0024] Figure 4 It is a structural schematic diagram of a rail vehicle according to another embodiment of the utility model.

[0025] Description of reference numerals in the accompanying drawings:

[0026] 10. Inclined track; 11. Slow-moving curve; 20. High-altitude track; 21. High-altitude detachment area; 22. High-altitude gripping area; 23. High-altitude storage bin; 24. High-altitude unloading area; 25. High-altitude loading area; 26. High-altitude material conveying device; 30. Low-altitude track; 31. Low-altitude detachment area; 32. Low-altitude gripping area; 33. Low-altitude storage bin; 34. Low-altitude unloading area; 35. Low-altitude loading area; 36. Low-altitude material conveying device; 40. Rail car; 41. Detachment gripper; 42. Carriage; 43. Wheel; 50. Traction cable; 51. Driving turntable; 52. Driven turntable; 53. Electric generator. DETAILED DESCRIPTION

[0027] The utility model provides a high-efficiency slope gravity energy storage system, which solves the problem that the existing technology cannot achieve continuity, high efficiency and stability, and realizes the use of bulk materials as energy storage media, which can continuously transport materials, and the energy storage and power generation output is stable, which will not form an impact on the power grid, and effectively reduces system losses and improves conversion efficiency. The gravity energy storage system of this scheme mainly relies on inclined tracks and traction cables to achieve continuous transportation of bulk materials, and then realizes energy storage and release, including low-altitude storage bins, low-altitude unloading areas, low-altitude loading areas, low-altitude gripping areas, low-altitude detachment areas, low-altitude tracks, inclined tracks, traction cables, cable drive systems, high-altitude storage bins, high-altitude unloading areas, high-altitude loading areas, high-altitude gripping areas, high-altitude detachment areas, high-altitude tracks, converters and control systems.

[0028] See also Figure 1 , Figure 2 , a high-energy-efficiency slope gravity energy storage system of an embodiment of the utility model includes an inclined track 10 located on a ramp, a high-altitude track 20 located in a relatively high-altitude area, and a low-altitude track 30 located in a relatively low-altitude area. The low-altitude track 30 and the high-altitude track 20 are both U-shaped curves, and the input end and the output end are about 180 degrees apart. The low-altitude track 30, the inclined track 10, and the high-altitude track 20 are connected to form a closed loop track for continuously circulating multiple rail vehicles 40. In this solution, natural mountain slopes, mine slopes, inclined mines and other ramps are used as inclined tracks for rail vehicles. Tracks are set on high and low altitude planes respectively to form a closed loop track with the inclined track to achieve continuous transportation.

[0029] A high altitude detachment zone 21 (automatic detachment zone) is provided at the input end of the high altitude track 20, and a high altitude gripping zone 22 (automatic gripping zone) is provided at the output end of the high altitude track 20. During operation, the railcar 40 will complete the detachment / gripping action with the traction steel cable 50 at the high altitude detachment zone 21 and the high altitude gripping zone 22. The altitude of the high altitude detachment zone 21 is higher than that of the high altitude gripping zone 22, and the high altitude track 20 is in a downward trend. The railcar 40 can move forward along the track under the action of gravity, effectively reducing the energy consumption of the system. Similarly, a low altitude detachment zone 31 is provided at the input end of the low altitude track 30, and a low altitude gripping zone 32 is provided at the output end of the low altitude track 30. The altitude of the low altitude detachment zone 31 is higher than that of the low altitude gripping zone 32, and the low altitude track 30 is in a downward trend. A high altitude bulk material storage and transportation system is provided in a relatively high altitude area, and a low altitude bulk material storage and transportation system is provided in a relatively low altitude area; so as to realize the storage and transportation of materials in high / low altitude areas. It also includes a traction steel cable 50 arranged parallel to the inclined track 10. The rail vehicle 40 is provided with a detachable and cable-grabbing device 41 adapted to the traction steel cable 50 to realize the aforementioned automatic detachable and cable-grabbing actions.

[0030] More specifically, the high-altitude bulk material storage and transportation system includes: a high-altitude storage bin 23 and a high-altitude unloading area 24 (automatic unloading area) are provided at a position of the high-altitude track 20 near the high-altitude detachment area 21, and the rail car 40 unloads materials at the high-altitude unloading area 24, for example, the bottom of the rail car 40 is opened to complete the unloading, and the materials enter the high-altitude storage bin 23. A high-altitude loading area 25 (automatic loading area) is provided at a position of the high-altitude track 20 near the high-altitude gripping area 22, and the rail car 40 loads materials at the high-altitude loading area 25. Similarly, the low-altitude bulk material storage and transportation system includes: a low-altitude storage bin 33 and a low-altitude unloading area 34 are provided at a position of the low-altitude track 30 near the low-altitude detachment area 31; a low-altitude loading area 35 is provided at a position of the low-altitude track 30 near the low-altitude gripping area 32. Further preferably, for example, the high altitude storage bin 23 is located below the high altitude unloading area 24, and the low altitude storage bin 33 is located below the low altitude unloading area 34, so as to facilitate the process of unloading to the discharge side efficiently.

[0031] A high-altitude material conveying device 26 is provided between the high-altitude storage bin 23 and the high-altitude loading area 25, which is used to convey materials from the high-altitude storage bin 23 to the high-altitude loading area 25, thereby completing the loading. Preferably, for example, the high-altitude storage bin 23 has a hopper structure, and the high-altitude material conveying device 26 is a conveying channel / conveyor connected to the bottom of the high-altitude storage bin 23, so as to realize the stable conveying of materials at a set flow rate in a low-energy manner; since the high-altitude track is U-shaped and downhill, the high-altitude material conveying device 26 can be arranged horizontally or slightly tilted downward; the rail car 40 is open at the top, for example, so that when passing through the high-altitude loading area 25, it can receive materials below the end of the high-altitude material conveying device 26. Similarly, a low-altitude material conveying device 36 is provided between the low-altitude storage bin 33 and the low-altitude loading area 35.

[0032] Preferably, there is a slow curve 11 at the connection between the low altitude track 30 and the inclined track 10, and at the connection between the high altitude track 20 and the inclined track 10. Figure 2 As shown, there are four slow-moving curves 11 in a closed circular track. The positions of the slow-moving curves 11 correspond to the positions where the inclined ramps change, providing deceleration and buffering effects.

[0033] The traction cable 50 is connected to a cable drive system. The traction cable 50 is of an annular design, connected through high-altitude and low-altitude pull-out turntables, and the drive device is connected to the high-altitude turntable. When storing energy, the electric motor drives the cable to move, and when releasing energy, it acts as a generator to generate electricity driven by the cable. More specifically, the cable drive system includes a driving turntable 51 and a driven turntable 52, and the driving turntable 51 and the driven turntable 52 are connected by the traction cable 50 (the traction cable is annularly wound on the turntable and operates by friction between the driving turntable and the traction cable). The number of driving turntables 51 and driven turntables 52 is set according to needs, for example Figure 2 In the illustrated embodiment, there is one driving turntable 51 and one driven turntable 52; in other embodiments, four turntables may be arranged in total and distributed at the four corners of the rectangle, so that the distance between the two adjacent tracks and the traction cable in the middle of the inclined track 10 will not be too close. The traction cable 50 is preferably arranged along the ground (laid close to the ground) to avoid the traction cable 50 from bending downward and ensure uniform traction.

[0034] Preferably, the driving turntable 51 is arranged in a relatively high altitude area and is located on the high altitude side of the high altitude detachment area 21; the driven turntable 52 is arranged in a relatively low altitude area and is located on the low altitude side of the low altitude gripping area 32; thereby ensuring that the length of the straight section of the traction cable 50 is sufficient and that the cable drive system is easy to drive and control stably. The driving turntable 51 is connected to an electric generator 53, which has two functions of power generation and electric power generation: when storing energy, the electric power of the grid is used, and the motor bearing rotates to do work; when generating electricity, the generator bearing rotates, and generates electricity through the rotor, stator and other devices; it is conceivable that the motor and generator can also be separately arranged to achieve the required functions.

[0035] See also Figure 3 The rail vehicle 40 includes, for example, a carriage 42, wheels 43 are provided on both sides of the carriage 42, and a detachable cable gripper 41 is provided at the bottom of the carriage 42. The position of the detachable cable gripper 41 matches the traction cable 50, and the detachable cable gripper 41 can achieve locking and detaching with the traction cable 50. The number of detachable cable grippers 41 matches the traction cable 50, for example Figure 4 As shown, two (or two rows) of detachable rope grippers 41 may be optionally provided on the left and right sides, and accordingly, the traction rope 50 has two parallel ropes on both the uplink and downlink sides of the inclined track 10. Further, a discharging port that can be opened and closed is provided at the bottom of the carriage 42, so that the bottom can be opened to discharge the material; and / or, a loading port is provided above the carriage 42, for example, an open port, so that the material can be dumped from above. The railcar 40 runs on a track, and the track carries and guides the railcar 40, including a low-altitude track 30, a high-altitude track 20 and an inclined track 10; wherein optionally, the low-altitude track 30 and the high-altitude track 20 are provided with a driving device for driving the railcar 40 after the detachment.

[0036] It also includes converter equipment and a control system, etc. The low altitude loading area 35, the low altitude unloading area 34, the high altitude loading area 25, the high altitude unloading area 24, the cable drive system and the converter equipment are interlockedly controlled through the control system.

[0037] The operation scheme of the gravity energy storage system of the preferred embodiment of the utility model is as follows.

[0038] 1. During energy storage, the rail car loads bulk materials into the rail car through the conveying device at the bottom of the low-altitude storage bin in the low-altitude loading area. The rail car travels along the low-altitude downhill track to the low-altitude cable holding area under the action of its own gravity. The rail car and the traction cable are automatically locked. Under the traction of the traction cable (consuming electricity to provide power), the fully loaded rail car runs upward along the inclined track to the high-altitude detachment area. The rail car and the traction cable are automatically detached to achieve deceleration, and then enter the high-altitude track. The rail car travels along the downhill track under the action of its own gravity and enters the high-altitude The unloading area is unloaded, and then the bottom of the rail car is opened to unload the materials into the high-altitude storage bin. After unloading is completed, the bottom of the rail car is closed, and then it continues to travel downhill along the high-altitude track to the high-altitude cable holding area to automatically lock with the traction cable, and runs along the inclined track to the low-altitude detachment area. After automatic detachment, the empty rail car enters the low-altitude track, and runs along the downhill track to the low-altitude loading area under the action of its own gravity. The conveying device arranged at the bottom of the low-altitude storage bin transfers the materials in the low-altitude storage bin to the rail car, and then enters the next cycle of material transportation.

[0039] The railcar runs at a low speed on the high-altitude track and the low-altitude track in the interval between unhooking and grabbing the cable, ensuring the necessary time interval for the railcar loading and unloading operations. After grabbing the cable, it keeps synchronization with the traction cable and runs at high speed along the inclined track to improve the efficiency of the energy storage system. There are multiple railcars, which are configured at intervals and run in a cycle to continuously transport bulk materials from the low-altitude storage yard to the high-altitude storage yard until the rated energy storage capacity is completed.

[0040] 2. When releasing energy (generating electricity), the rail car loads bulk materials into the rail car through the conveying device at the bottom of the high-altitude storage bin in the high-altitude loading area. The rail car travels along the high-altitude track to the high-altitude cable holding area under the action of its own gravity. The rail car and the traction steel cable are locked, and the fully loaded rail car moves downward under the action of its own gravity. The rail car drives the drive turntable to rotate at high speed through the traction steel cable, thereby driving the generator to generate electricity to realize the conversion of gravitational potential energy into electrical energy. When the fully loaded rail car runs downward along the inclined track to the low-altitude detachment area, the rail car is towed by the traction steel cable to achieve deceleration, and then enters the low-altitude track. Under the action of its own gravity, the rail car travels along the downhill track to enter the low-altitude unloading area, and then the bottom of the rail car opens to unload the materials into the low-altitude storage bin. After unloading, the bottom of the rail car closes, and then travels along the low-altitude track to the low-altitude holding cable area and locks with the traction steel cable, and runs upward along the inclined track to the high-altitude detachment area. After detachment, the empty rail car enters the high-altitude track, and runs along the downhill track to the high-altitude loading area under the action of its own gravity. The conveying device arranged at the bottom of the high-altitude storage bin transfers the materials in the high-altitude storage bin and loads them into the rail car, and then enters the next cycle of material transportation.

[0041] There are multiple rail cars, which are arranged at intervals and run in a cycle, continuously transporting bulk materials from high-altitude storage yards to low-altitude storage yards until the rated power generation capacity is completed.

[0042] In summary, the high-energy-efficiency slope gravity energy storage system of the utility model is considered from the perspective of power engineering application, while fully considering the use of existing conditions such as abandoned mines, inclined mines, and natural mountains. All bulk materials such as tailings, waste ores, sand and gravel can be used as energy storage media, truly achieving secondary development and utilization of waste and waste ores, in line with the national dual-carbon goals, and adapting to the development trend of the general environment. The high-energy-efficiency slope gravity energy storage system of the utility model can continuously transport materials, and the energy storage and power generation output are stable, and will not cause an impact on the power grid. The rail car equipped with a towing cable gripper runs at high speed with the traction cable before unhooking, ensuring high-efficiency operation of the energy storage and power generation states; at the same time, it can run at a slow speed after unhooking, fully ensuring the necessary time interval for the loading and unloading system, thereby ensuring the stability of the system and environmentally friendly operation, and effectively overcoming the contradiction in the current patent that the operating efficiency and loading and unloading efficiency cannot be guaranteed at the same time. In the high-efficiency slope gravity energy storage system of the utility model, both the high-altitude track and the low-altitude track are downhill. After the rail car enters the high (low) altitude track, it can move by itself under the action of its own gravity, without the need for additional drive, which can effectively reduce system losses and improve conversion efficiency. The slope of the high-altitude track and the low-altitude track is closely related to the weight of the rail car and the system's transportation capacity. The running speed of the rail car is controlled by adjusting the size of the slope. In the high-efficiency slope gravity energy storage system of the utility model, the traction steel cable is laid along the ground, which can increase the support for the wire rope, avoid the phenomenon of wire rope deflection between two brackets when the wire rope is laid overhead as in the existing patent, resulting in insufficient local traction power or uneven distribution of traction force, and increase the stability of the wire rope and its service life. The high-efficiency slope gravity energy storage system of the utility model can adjust the effective length of the inclined track according to the needs of the project and actual environmental conditions, and can also adjust the number and size of the track cars, so as to configure the installed capacity required by the project; in addition, this solution can be modularized according to the actual project needs, forming a side-by-side arrangement or continuous relay of multiple gravity energy storage systems to achieve a larger installed capacity. The purpose of gravity energy storage is to store and release electric energy, and the released electric energy is transmitted to the user side through the existing power grid. The released electric energy has higher technical requirements such as voltage and current. Compared with the existing technical solutions (patents), this solution is the only one with engineering promotion value.

Claims

1. A high energy efficiency slope gravity energy storage system, characterized in that: The invention comprises an inclined track (10) located on a ramp, a high altitude track (20) located in a relatively high altitude area, and a low altitude track (30) located in a relatively low altitude area, wherein the low altitude track (30), the inclined track (10), and the high altitude track (20) are connected to form a closed loop track for continuously circulating a plurality of rail vehicles (40); A high altitude detachment area (21) is provided at the input end of the high altitude track (20), and a high altitude gripping area (22) is provided at the output end of the high altitude track (20); the altitude of the high altitude detachment area (21) is higher than that of the high altitude gripping area (22), and the high altitude track (20) has a downward slope; A low altitude detachment area (31) is provided at the input end of the low altitude track (30), and a low altitude gripping area (32) is provided at the output end of the low altitude track (30); the low altitude detachment area (31) is higher than the low altitude gripping area (32), and the low altitude track (30) has a downward slope; A high-altitude bulk material storage and transportation system is provided in relatively high-altitude areas, and a low-altitude bulk material storage and transportation system is provided in relatively low-altitude areas; It also includes a traction steel cable (50) arranged parallel to the inclined track (10), and the rail vehicle (40) is provided with a detachable cable gripper (41) adapted to the traction steel cable (50).

2. The high energy efficiency slope gravity energy storage system according to claim 1 is characterized in that: The high-altitude bulk material storage and transportation system comprises a high-altitude storage bin (23) and a high-altitude unloading area (24) provided at a position of the high-altitude track (20) close to the high-altitude detachment area (21), and a high-altitude loading area (25) provided at a position of the high-altitude track (20) close to the high-altitude gripping area (22); The low-altitude bulk material storage and transportation system comprises a low-altitude storage bin (33) and a low-altitude unloading area (34) provided at a position of the low-altitude track (30) close to the low-altitude detachment area (31); and a low-altitude loading area (35) provided at a position of the low-altitude track (30) close to the low-altitude gripping area (32).

3. The high energy efficiency slope gravity energy storage system according to claim 2 is characterized in that: The high-altitude storage bin (23) is located below the high-altitude unloading area (24), and the low-altitude storage bin (33) is located below the low-altitude unloading area (34).

4. The high energy efficiency slope gravity energy storage system according to claim 2, characterized in that: A high-altitude material conveying device (26) is provided between the high-altitude material storage bin (23) and the high-altitude material loading area (25); and a low-altitude material conveying device (36) is provided between the low-altitude material storage bin (33) and the low-altitude material loading area (35).

5. The high energy efficiency slope gravity energy storage system according to claim 1, characterized in that: A slow-moving curve (11) is provided at a connection point between a low-altitude track (30) and an inclined track (10), and at a connection point between a high-altitude track (20) and an inclined track (10).

6. The high energy efficiency slope gravity energy storage system according to any one of claims 1 to 5, characterized in that: The traction steel cable (50) is connected to a steel cable driving system; the steel cable driving system comprises a driving turntable (51) and a driven turntable (52); the driving turntable (51) and the driven turntable (52) are connected by transmission via the traction steel cable (50); the traction steel cable (50) is arranged along the ground.

7. The high energy efficiency slope gravity energy storage system according to claim 6, characterized in that: The driving turntable (51) is arranged in a relatively high altitude area and is located on the high altitude side of the high altitude detachment area (21); the driven turntable (52) is arranged in a relatively low altitude area and is located on the low altitude side of the low altitude gripping area (32).

8. The high energy efficiency slope gravity energy storage system according to claim 6, characterized in that: The driving rotary disc (51) is connected to an electric generator integrated machine (53).

9. The high energy efficiency slope gravity energy storage system according to claim 6, characterized in that: The rail vehicle (40) comprises a carriage (42), wheels (43) are arranged on both sides of the carriage (42), and a detachable gripping device (41) is arranged at the bottom of the carriage (42).

10. The high energy efficiency slope gravity energy storage system according to claim 9, characterized in that: The bottom of the carriage (42) is provided with an openable and closable discharge port, and / or the top of the carriage (42) is provided with a loading port.

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