WO2023155194A1

WO2023155194A1 - Gravity energy storage system

Info

Publication number: WO2023155194A1
Application number: PCT/CN2022/077095
Authority: WO
Inventors: 王猛; 龚鑫; 徐波; 赵旭山; 徐诗林
Original assignee: 宁德时代新能源科技股份有限公司
Priority date: 2022-02-21
Filing date: 2022-02-21
Publication date: 2023-08-24
Also published as: CN220890419U

Abstract

A gravity energy storage system. The gravity energy storage system comprises: a shaft (13), a plurality of heavy objects (14), an object storage area (15), and a hoisting device (12), wherein the hoisting device (12) is used for using, in an energy storage working condition, electric energy to successively move the plurality of heavy objects (14) from the shaft (13) to the object storage area (15) to store electric energy; and in an energy release working condition, generating electric energy by means of the movement of the plurality of heavy objects (14) from the object storage area (15) to the shaft (13), so as to release electric energy. The gravity energy storage system has a simple structure, low construction difficulty, and a low cost, and can effectively improve energy storage capacity by using a plurality of heavy objects (14), thereby improving energy storage efficiency.

Description

A Gravity Energy Storage System

technical field

The present application relates to the technical field of energy storage, in particular to a gravity energy storage system.

Background technique

With the increasing environmental pollution, the new energy industry has attracted more and more attention. However, there may be a strong spatio-temporal mismatch between the production and consumption of new energy power, therefore, energy storage technology is required to store it. Thus, how to improve the efficiency of energy storage has become an urgent problem to be solved.

Contents of the invention

The embodiment of the present application provides a gravity energy storage system, which can improve the efficiency of energy storage.

In the first aspect, a gravity energy storage system is provided, which is characterized in that it includes: a vertical shaft; a storage area; a plurality of heavy objects; lifting equipment, and the lifting equipment is used to utilize electric energy under the energy storage condition The weights are sequentially moved from the shaft to the storage area to store electrical energy; under the energy release condition, the movement of the plurality of weights from the storage area to the shaft generates electrical energy to release the electrical energy.

In the embodiment of the present application, electric energy is used to sequentially move multiple heavy objects from the shaft to the storage area, so that the electrical energy can be converted into gravitational potential energy to store electrical energy; moving multiple heavy objects from the storage area to the shaft can make gravity Potential energy is converted into electrical energy thereby releasing electrical energy. The multiple heavy objects in the storage area are directly used as the medium for storing and releasing electric energy. The gravity storage system has simple equipment, low construction difficulty, low cost, and strong operability, and the use of multiple heavy objects can effectively increase the energy storage, thereby It can improve the efficiency of energy storage.

In some possible implementations, the gravity energy storage system further includes: rails arranged on both sides of the shaft and the storage area, and the lifting equipment slides on the rails to move to the The different locations of the storage areas described above.

In the embodiment of the present application, rails are set on both sides of the shaft and the storage area, so that the lifting equipment can slide on the rails to lift multiple heavy objects in the storage area during the energy storage and release conditions and place multiple heavy objects in the storage area. The use of rails to complete the movement of heavy objects in different positions can improve the efficiency of conversion between gravitational potential energy and electrical energy in the gravitational energy storage system.

In some possible implementation manners, under the energy storage working condition, the lifting device lifts the heavy object from the bottom of the shaft out of the wellhead of the shaft, and the lifting device slides on the track to The weight moves to the corresponding position of the storage area. In the condition of energy release, the lifting device lifts the heavy object at the corresponding position of the storage area, and the lifting device slides on the track to move the heavy object to the shaft The wellhead position, the weight is lowered in the shaft for energy release.

In the embodiment of the present application, during the storage condition, the lifting equipment lifts the heavy object from the wellhead of the shaft, and moves the heavy object to the corresponding position of the storage area through the sliding of the lifting equipment on the track. When the electric energy is converted into gravitational potential energy, the storage of electric energy is completed. When the working condition is released, the lifting equipment lifts the heavy object at the corresponding position in the storage area, and moves the heavy object to the wellhead of the shaft through the sliding of the lifting device on the track, and the heavy object falls in the shaft, at this time, the gravitational potential energy is converted into electrical energy to complete the release of electrical energy. The gravity energy storage system is simple in operation and low in cost.

In some possible implementation manners, the storage area and the shaft are arranged in a row along the first direction, and the track extends along the first direction and is located on the second side of the shaft and the storage area. On both sides of the direction, the first direction and the second direction are both perpendicular to the direction of gravity, and the first direction and the second direction are perpendicular.

In the embodiment of the present application, the storage area and the shaft are arranged along the first direction, and the rails are distributed on both sides of the storage area and the shaft, and the length of the rails in the first direction is long enough to meet the needs of each of the storage areas. Any location can store heavy objects, which can improve the utilization rate of the storage area and thus increase the power storage capacity of the system.

In some possible implementation manners, the lifting device includes a support beam frame, and in the energy storage condition, the lifting device lifts the weight from the bottom of the shaft out of the wellhead of the shaft, the Lifting equipment moves on the support beam to move the weight to a corresponding position in the storage area. In the energy release condition, the lifting device lifts the heavy object corresponding to the storage area and moves on the support beam, and moves the heavy object to the wellhead position of the shaft, The weight is lowered in the shaft for energy release.

In the embodiment of the present application, the supporting beam frame is fixed across both sides of the vertical shaft and the storage area, and the lifting equipment moves on the supporting beam frame to move the heavy objects at different positions in the storage area to the wellhead of the vertical shaft and move different The heavy objects are moved from the shaft to different positions in the storage area to complete the storage and release of electric energy. The support beams are directly arranged on both sides of the shaft and the storage area, and the lifting equipment can slide directly on them without other equipment, which further reduces the construction difficulty and cost of the gravity energy storage system equipment.

In some possible implementation manners, the storage area and the shaft are arranged in a row along the third direction, and the support beam extends along the third direction and is arranged between the shaft and the storage area. Above, the third direction is perpendicular to the direction of gravity.

In the embodiment of the present application, the storage area and the vertical shaft are arranged along the third direction, the supporting beam frame is arranged above the storage area and the vertical shaft, and the length of the supporting beam frame meets any requirements that can move different weights to the storage area. location, which can improve the utilization rate of the storage area and thus increase the energy storage capacity of the energy storage system.

In some possible implementation manners, the storage area has multiple positions, and the different positions are distributed on both sides of the shaft in the first direction.

In the embodiment of the present application, a plurality of storage areas in the first direction are arranged on both sides of the vertical shaft respectively. Increasing the number of storage areas can store more media for storing electric energy and generating electricity, thereby increasing the storage capacity of the gravity storage system. energy.

In some possible implementation manners, different positions of the storage area are distributed on both sides of the shaft in the third direction.

In the embodiment of the present application, the storage area has multiple locations, and the storage areas of multiple locations are divided along the third direction and distributed on both sides of the shaft. Increasing the number of storage areas can store more stored electrical energy and generate electricity medium, thereby increasing the storage energy of the gravity storage system.

In some possible implementation manners, the lifting device includes an electromechanical group and a winch, and under the energy storage condition, the output energy of the electromechanical group moves a plurality of heavy objects fixed by the winch from the shaft. Divide to achieve energy storage. In the energy storage working condition, multiple heavy objects fixed by the winch enter the shaft and drive the electromechanical unit to generate electricity to realize energy release.

In the embodiment of this application, in the energy storage working condition, the output energy of the electromechanical group in the lifting equipment will remove the multiple heavy objects fixed by the winch from the shaft and place them in the storage area. At this time, the electric energy of the electromechanical group Converted to gravitational potential energy, electrical energy is stored. In the energy release condition, multiple heavy objects fixed by the winch are brought into the shaft from the storage area, and the multiple heavy objects land in the shaft to drive the electromechanical unit to generate electricity. At this time, the gravitational potential energy is converted into electrical energy, and the electrical energy is freed. The gravity energy storage system is simple in operation and low in cost.

In some possible implementation manners, the lifting device includes multiple sets of the electromechanical unit and the winch, and the multiple sets of the electromechanical unit and the winch jointly hoist the same weight.

In the embodiment of the present application, the electromechanical group and winch adopt multiple parallel working modes, which reduces the weight of heavy objects borne by a single group of electromechanical group and winch, which can reduce the wear and tear on mechanical equipment, thereby reducing the maintenance cost of the system.

In some possible implementation manners, the total height of the plurality of weights is not greater than one-third of the depth of the shaft.

In the embodiment of the present application, controlling the total height of the multiple heavy objects to be no more than one-third of the depth of the shaft can improve the utilization ratio of the shaft.

In some possible embodiments, the depth of the shaft is greater than 100 meters.

In the embodiment of the present application, controlling the depth of the shaft to be greater than 100 meters can improve the utilization rate of the shaft and thus increase the electric energy storage capacity of the gravity storage system.

In some possible implementations, the weight of a single weight is not greater than 500 tons.

In the embodiment of this application, reducing the weight of a single heavy object and increasing the number of heavy objects, so that the heavy objects in the gravity energy storage system change from heavy to light and many, can effectively reduce the cost per unit of electricity of the gravity energy storage system .

In some possible implementation manners, the depth of the shaft is 500 meters, and the weight of the plurality of heavy objects is 1750 tons.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the accompanying drawings that need to be used in the embodiments of the present application. Obviously, the accompanying drawings described below are only some embodiments of the present application. Those of ordinary skill in the art can also obtain other drawings based on the accompanying drawings on the premise of not paying creative efforts.

Fig. 1 is a side view of an embodiment of the present application;

Fig. 2 is a top view of a gravity energy storage system according to an embodiment of the present application;

Fig. 3 is a top view of a gravity energy storage system according to another embodiment of the present application;

In the drawings, the drawings are not drawn to scale.

Marking instructions: 11-winch; 12-lifting equipment; 13-shaft; 14-weight; 15-storage area; 16-track.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are the Claim some of the examples, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those skilled in the technical field of this application; the terms used in this application in the description of the application are only to describe specific implementations The purpose of the example is not intended to limit the present application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and the description of the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the description and claims of the present application or the above drawings are used to distinguish different objects, rather than to describe a specific sequence or primary-subordinate relationship.

Reference in this application to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The occurrences of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is understood explicitly and implicitly by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

In the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", "connection", "attachment", and "setting" should be understood in a broad sense, for example, It can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application according to specific situations.

The term "and/or" in this application is only an association relationship describing associated objects, which means that there may be three relationships, for example, A and/or B, which can mean: A exists alone, A and B exist simultaneously, and A and B exist alone. There are three cases of B. In addition, the character "/" in this application generally indicates that the contextual objects are an "or" relationship.

For the problems of time-space mismatch and low utilization rate in new energy power production, only low-cost, large-capacity, and easy-to-locate energy storage technologies can effectively solve this problem. At the same time, such energy storage technologies are also renewable energy sources. It is an important guarantee for large-scale efficient development and utilization and the realization of the green and sustainable development strategy in the energy field.

Among them, gravity energy storage is an ancient and relatively mature energy storage technology, especially pumped hydro storage technology, which has been commercially implemented. However, pumped water storage technology has high requirements for site selection, requiring the construction of upstream and downstream reservoirs, and the evaporation of water is relatively large. It is difficult to select sites in the north, especially in the northwest. The gravitational potential energy storage system that uses slope tracks and shafts to lift heavy objects has attracted widespread attention because of its superiority in arid and water-scarce areas. Using slope track for gravity energy storage, its efficiency is closely related to the slope gradient, the greater the slope, the smaller the friction loss, but there are many difficulties in the construction of large slope slopes and tracks, and it is necessary to consider the impact of extreme weather, geological disasters, etc. on the energy storage system Impact.

In view of this, the embodiment of the present application provides a gravity energy storage system for vertical lifting of heavy objects, which can meet the needs of large capacity and long-term energy storage, and the whole system has simple equipment, strong operability, and low cost, which is conducive to popularization.

Fig. 1 is a side view of a gravity energy storage system according to an embodiment of the present application. As shown, the gravitational energy storage system includes a shaft 13 , a plurality of weights 14 , lifting equipment 12 and a storage area 15 . The hoisting device 12 is used to move a plurality of heavy objects 14 from the shaft 13 to the storage area 15 sequentially by using electric energy under the energy storage condition to store electric energy; The movement of the object zone 15 to the shaft 13 generates electrical energy for release.

In the energy storage mode, a plurality of heavy objects 14 are hoisted out of the shaft 13 and moved to the storage area 15 through electric energy, at this time, the electric energy is converted into gravitational potential energy to store electric energy. In the energy release mode, a plurality of heavy objects 14 in the storage area 15 are put into the shaft 13 in sequence, and the gravitational potential energy is converted into electrical energy to release the electrical energy.

The hoisting equipment 12 is an important tool and equipment for realizing the mechanization and automation of the production process, reducing heavy physical labor and improving labor productivity in industry, transportation and construction enterprises. Lifting equipment 12 can be divided into several classes such as light and small lifting equipment, lifts, cranes and overhead monorail systems according to different structures. Light and small lifting equipment mainly includes lifting blocks, spreaders, jacks, manual hoists, electric hoists and ordinary winches, most of which are small in size, light in weight and easy to use. Except for electric hoists and winches, most of them are driven by manpower and are suitable for occasions where the work is not heavy. They can be used alone, and some can also be used as the lifting mechanism of the crane. The elevator is mainly used for vertical or near-vertical lifting movement, with a fixed lifting route, including elevators, lifting platforms, mine hoists and hopper elevators. Cranes are multi-action lifting equipment that lift vertically and carry heavy objects horizontally within a certain range. Bridge type cranes include gantry cranes, special cranes, gantry cranes, loading and unloading bridges, etc.; jib type cranes include truck cranes, tire type Cranes, crawler cranes, tower cranes, portal cranes, floating cranes and railway cranes. An elevator is a hoisting machine that lifts a heavy object or fetching device along a guide rail, and it includes a manned or cargo elevator. Although the elevator has only one lifting action, the mechanism is very complicated, especially the elevator that carries people: the elevator requires complete safety devices and electronic control devices.

In the embodiment of the present application, a gantry crane is taken as an example for illustration, that is, the lifting device 12 is a gantry crane, but this embodiment of the present application is not limited to this, for example, the lifting device 12 may also be a special crane.

The vertical shaft 13 is a kind of steep well wall, almost upright well-shaped pipeline, which is square, strip-shaped or irregularly circular in plane profile. Long strips are developed along one group of joints, square or round are developed along two groups of joints. The vertical shaft 13 may adopt a round shaft, a square shaft or other forms, which are not limited in this embodiment of the present application.

The multiple weights 14 may be stones, concrete blocks or other materials that exist in nature, which is not limited in this embodiment of the present application.

A plurality of heavy objects 14 are hoisted and moved to the storage area 15 by using electric energy and a plurality of heavy objects 14 of the storage area 15 are moved into the vertical shaft, so that the conversion between electric energy and gravitational potential energy can be completed, and the electric energy can be sufficient. Store the electric energy first under the circumstances, and release the electric energy when electricity is needed. The energy storage system has simple equipment, low cost, and strong operability, and the use of multiple weights 14 can effectively increase the energy storage, thereby improving the energy storage capacity. s efficiency.

Fig. 2 is a top view of a gravity energy storage system according to an embodiment of the present application. As shown in FIG. 2 , the gravity energy storage system further includes rails 16 , which are arranged on both sides of the shaft 13 and the storage area 15 , and the lifting device 12 slides on the rails to move to different positions of the storage area 15 respectively.

Track 16 is generally made up of two parallel steel rails, and steel rail is fixedly placed on the sleeper, and is road ballast under the sleeper. It is fastened by rail braces, fasteners, rail clamps, splints, elastic strips, spikes and other accessories. When the lifting device 12 lifts the weight 14 and needs to move between the shaft 13 and the storage area 15, the weight 14 can be moved between the shaft 13 and the storage area 15 by sliding on the track 16 by the lifting device 12 . position change.

By setting rails 16 on both sides of the shaft 13 and the storage area 15, the lifting device 12 slides on the rails 16 to complete the movement of the weight 14 between the shaft 13 and the storage area 15, which can improve the gravity energy storage system. Efficiency of conversion between gravitational potential energy and electrical energy.

In some embodiments of the present application, under the energy storage condition, the lifting device 12 lifts the weight 14 from the bottom of the shaft 13 out of the wellhead of the shaft 13, and the lifting device 12 slides on the rail 16 to move the weight 14 to the The corresponding position of the storage area 15. In the energy release mode, the lifting device 12 lifts the weight 14 at the corresponding position of the storage area 15, and slides the weight 14 on the rail 16 by the lifting device 12 to move the weight 14 to the wellhead position of the shaft 13, and the weight 14 Descending in shaft 13 for energy release.

In the energy storage working condition, the lifting device 12 lifts the heavy object 14 out of the shaft 13, and moves the heavy object 14 to the corresponding position of the storage area 15 through the sliding of the lifting device 12 on the track 16. At this time, the electric energy conversion into gravitational potential energy to complete the storage of electric energy. When the working condition is released, the lifting device 12 lifts the heavy object 14 corresponding to the position of 15 in the storage area, and the heavy object 14 is moved to the wellhead of the shaft 13 through the sliding of the lifting device 12 on the track 16, and the heavy object 15 is in the shaft Landing within 13, the gravitational potential energy is converted into electric energy at this moment, and the discharge of electric energy is completed. The gravitational energy storage system converts electric energy and gravitational potential energy into each other by hoisting and landing the weight 14 to complete the storage and release of electric energy, and the operation is simple and the equipment cost is low.

In some embodiments of the present application, the storage area 15 and the shaft 13 are arranged in a row along the first direction, and the track 16 extends along the first direction and is located on both sides of the shaft 13 and the storage area 15 in the second direction, Both the first direction and the second direction are perpendicular to the gravity direction, and the first direction and the second direction are perpendicular.

The arrangement of the storage area 15 and the shaft 13 in the first direction can be as shown in Figure 2, and the two storage areas 15 are symmetrically arranged on both sides of the shaft 13 respectively, and the storage area 15 can also be arranged only on one side of the shaft 13. On the other hand, the application does not limit the arrangement of the storage area 15 and the shaft 13 . In addition, one shaft 13 can be equipped with two or even more storage areas 15, and multiple shafts 13 can also be equipped with two or more storage areas 15. The application does not make any limitation on the number of shafts 13 and storage areas 15. Any restrictions. Regardless of the number and arrangement of storage areas 15 and shafts 13 , rails 16 are located on both sides of all shafts 13 and storage areas 15 .

The storage area 15 and the vertical shaft 13 are arranged along the first direction, and the track 16 is distributed on both sides of the storage area 15 and the vertical shaft 13, and the length of the track 16 is long enough to satisfy the various positions in the storage area 15 in the first direction. All can store the demand of the heavy objects 14, so that the utilization rate of the storage area 15 can be improved so as to increase the electric energy storage capacity of the system.

Fig. 3 is a top view of a gravity energy storage system according to another embodiment of the present application. As shown in Figure 3, the lifting device 12 includes a supporting beam frame. In the energy storage mode, the lifting device 12 lifts the weight 14 from the bottom of the shaft 13 out of the wellhead of the shaft 13, and the lifting device 12 is on the supporting beam frame. Move, move the weight 14 to the corresponding position of the storage area 15 . Under the energy release condition, the lifting device 12 lifts the heavy object 14 at the corresponding position of the storage area 15 and moves on the supporting beam frame, and moves the heavy object 14 to the wellhead position of the shaft 13, and the heavy object 14 falls in the shaft 13 thereby releasing energy.

The lifting device 12 is a bridge-type lifting device in which the horizontal bridge is arranged on two supporting beams to form a gantry shape. The supporting beams make the gantry a static system, which can stabilize the lifting device 12 and prevent the The additional stresses due to thrust under load cause the lifting device 12 to wobble.

The support girder spans above the shaft 13 and the storage area 15 , and at this time the support girder is fixedly arranged on both sides of the shaft 13 and the storage area 15 . To finish moving the heavy object 14 to different positions of the storage area 15, the lifting device 12 can be moved on the support beam to complete the position change of the heavy object 14.

In the above scheme, the support beam frame is fixedly arranged on both sides of the shaft 13 and the storage area 15. In the energy storage condition, the lifting device 12 lifts the weight 14 out from the bottom of the shaft 13 to the wellhead of the shaft 13, and lifts The device 12 moves on the support beam to move the weight 14 to the corresponding position of the storage area 15, and completes the process of converting electrical energy into gravitational potential energy. In the energy release condition, the lifting device 12 lifts the heavy object 14 from the corresponding position of the storage area 15, and the lifting device 12 moves on the support beam to move the heavy object 14 to the wellhead of the shaft 13 and put down the heavy object 14 , the weight 14 falls in the vertical shaft 13 to complete the process of converting gravitational potential energy into electrical energy.

By setting the supporting beam frame, the energy storage system equipment can be guaranteed to be stable and the normal operation of the system can be guaranteed. Moreover, the position of the weight 14 can be changed by moving the lifting device 12 on the support beam to complete the mutual conversion of gravitational potential energy and electric energy, which can further reduce the construction difficulty of the gravity energy storage system, simplify the equipment, and reduce the construction cost.

In some embodiments of the present application, the storage area 15 and the shaft 13 are arranged in a row along the third direction, the support beams extend along the first direction and are arranged above the shaft 13 and the storage area 15, and the third direction is perpendicular to Gravity direction.

The arrangement of storage areas 15 and shafts 13 in the third direction can be arranged adjacent to one storage area 15 and one shaft 13 as shown in Figure 3, or two storage areas 15 can be arranged on both sides of shaft 13 respectively , the present application does not make any limitation on the number of storage areas 15 and shafts 13 and the arrangement of storage areas 15 and shafts 13 . However, regardless of the number and arrangement of storage areas 15 and shafts 13 , the support beams are arranged above all shafts 13 and storage areas 15 .

The vertical shaft 13 and the storage area 15 are arranged along the third direction, the supporting beam frame is arranged across the top of the vertical shaft 13 and the storage area 15, and the length of the supporting beam frame in the third direction is long enough to meet the needs of each storage area 15. The location can store the demand of the heavy object 14, which can improve the utilization rate of the storage area 15 and thus increase the electric energy storage capacity of the system.

In some embodiments of the present application, the storage area 15 has multiple positions, and different positions are distributed on both sides of the shaft 13 in the first direction.

The plurality of storage areas 15 are symmetrically distributed on both sides of the shaft 13 in the first direction, which can shorten the moving distance of the heavy object 14 compared to being arranged on one side of the shaft. In addition, a plurality of storage areas 15 can be set to place more heavy objects 14 .

In some embodiments of the present application, different positions of the storage area 15 are distributed on both sides of the shaft 13 in the third direction.

A plurality of storage areas 15 are symmetrically distributed on both sides of the shaft 13 in the third direction, which can shorten the moving distance of the heavy object 14 compared to being arranged on one side of the shaft. In addition, a plurality of storage areas 15 can be set to place more heavy objects 14 .

In the above solution, increasing the number of storage areas 15 can provide more media for storing electric energy and generating electricity, thereby increasing the energy storage capacity of the gravity energy storage system. A plurality of storage areas 15 are symmetrically arranged on both sides of the shaft 13 in the first direction and the third direction, which can shorten the moving distance of the heavy objects 14, thereby reducing the loss of the mechanical structure of the system.

In some embodiments of the present application, the lifting device 12 includes an electromechanical group and a winch 11. Under the energy storage condition, the output energy of the electromechanical group removes a plurality of weights 14 fixed by the winch 11 from the shaft 13 to realize storage. able. In the energy release condition, multiple weights 14 fixed by the winch 11 enter the shaft 13 and drive the electromechanical unit to generate power to realize energy release.

The winch 11 is a hoisting tool that rotates a vertically arranged reel by manpower or mechanical power, and winds a flexible member (wire rope, chain, etc.) horizontally to complete the traction work. According to the different driving forces, there are mainly the following six types: electric winch, PTO winch, hydraulic winch, wheel winch, manual winch and pneumatic winch. The embodiment of the present application does not limit the type of the winch. The winch includes: relay transmission, motor, noose hook, noose guide, noose drum, noose, clutch, etc. An electromechanical unit and a winch 11 are a group of electromechanical units and winches 11 , wherein the electromechanical unit is used to generate and output energy, and the winch 11 is used to control multiple weights 14 . The winch 11 contains a noose hook and a noose, wherein the noose hook is used to hook the weight 14, and the noose is used to lift the weight 14 and make the weight 14 fall to drive the electromechanical unit to generate electricity.

In the above scheme, in the energy storage working condition, the electromechanical group in the lifting device 12 removes a plurality of heavy objects 14 fixed by the winch 11 from the shaft 13 and places them in the storage area 15. At this time, the electric energy of the electromechanical group Converted to gravitational potential energy, electrical energy is stored. In the energy release mode, a plurality of heavy objects 14 fixed by the winch 11 are brought into the shaft 13 from the storage area, and the plurality of heavy objects 14 fall in the shaft 13 to drive the electromechanical group to generate electricity. At this time, the gravitational potential energy is converted into Electrical energy, electrical energy is released. The gravity energy storage system is simple in operation and low in cost.

In some embodiments of the present application, the lifting device 12 includes multiple sets of electromechanical sets and winches 11 , and multiple sets of electromechanical sets and winches 11 work together to hoist the same weight 14 .

In the gravity energy storage system of the present application, in order to improve the energy storage capacity of the system electric energy, the weight of each heavy object 14 in the plurality of heavy objects 14 is relatively large, and multiple groups of electromechanical groups and winches 11 jointly lift the same heavy object 14 Can reduce the weight of the weight 14 that every group of electromechanical group and winch bears.

In the above scheme, the electromechanical group and the winch 11 adopt a multi-group parallel working mode, which reduces the weight of the heavy objects borne by a single electromechanical group and the winch 11, which can reduce the loss of the mechanical equipment of the gravity energy storage system, thereby reducing the maintenance cost of the system .

In some embodiments of the present application, the total height of the plurality of weights 14 is not greater than one third of the depth of the shaft 13 .

The higher the weight 14 falls in the shaft 13 , the more gravitational potential energy will be converted into electrical energy, thereby improving the utilization rate of the shaft 13 .

Optionally, the depth of the shaft 13 is greater than 100 meters. Controlling the depth of the shaft 13 to be greater than 100 meters can improve the utilization rate of the shaft and thus increase the electric energy storage capacity of the gravity storage system.

Optionally, the weight of a single weight 14 is not greater than 500 tons. Reduce the weight of a single heavy object and increase the number of heavy objects, so that the heavy objects in the gravity energy storage system change from heavy to light and many, which can effectively reduce the cost per unit of electricity of the gravity energy storage system.

Optionally, the depth of the shaft 13 is 500 meters, and the weight of the plurality of weights is 1750 tons.

While the application has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the application. In particular, as long as there is no structural conflict, the technical features mentioned in the various embodiments can be combined in any manner. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

A gravity energy storage system, characterized in that it comprises:

Shaft (13);

storage area (15);

Multiple weights (14);

Lifting device (12), the lifting device (12) is used to use electric energy to move the plurality of heavy objects (14) from the shaft (13) to the storage area (15) in sequence under the energy storage condition to store electric energy; under the condition of energy release, the movement of the plurality of heavy objects (14) from the storage area (15) to the shaft (13) generates electric energy to release the electric energy.
The gravity energy storage system according to claim 1, wherein the gravity energy storage system (1) further comprises:

rails (16), arranged on both sides of the shaft (13) and the storage area (15), the lifting device (12) slides on the rails (16) to move to the storage area Different locations of the object area (15).
The gravity energy storage system according to claim 2, characterized in that,

In the energy storage working condition, the lifting device (12) lifts the weight (14) from the bottom of the shaft (13) out of the wellhead of the shaft (13), and the lifting device (12) sliding on the track (16), moving the weight (14) to the corresponding position of the storage area (15);

In the energy release condition, the lifting device (12) lifts the weight (14) at the corresponding position of the storage area (15), and the lifting device (12) lifts the weight (14) on the track ( 16) slide up to move the weight (14) to the wellhead position of the shaft (13), and the weight (14) falls in the shaft (13) for energy release.
The gravity energy storage system according to claim 3 or 4, characterized in that,

The storage area (15) and the shaft (13) are arranged in a row along a first direction, and the track (16) extends along the first direction and is located between the shaft (13) and the storage area On both sides of (15) in the second direction, the first direction and the second direction are both perpendicular to the direction of gravity, and the first direction and the second direction are perpendicular.
The gravity energy storage system according to claim 2, characterized in that,

The lifting device (12) includes a supporting beam frame, and in the energy storage condition, the lifting device (12) lifts the weight (14) out of the shaft from the bottom of the shaft (13) (13) wellhead, the lifting device (12) moves on the support beam frame, and moves the weight (14) to the corresponding position of the storage area (15);

In the energy release condition, the lifting device (12) lifts the weight (14) at the corresponding position of the storage area (15) and moves on the support beam, and the weight (14) moving to the wellhead position of the shaft (13), and the weight (14) falls in the shaft (13) to release energy.
The gravity energy storage system according to claim 5, characterized in that,

The storage area (15) and the shaft (13) are arranged in a row along the third direction, and the support beam extends along the third direction and is arranged on the shaft (13) and the storage area (15), the third direction is perpendicular to the direction of gravity.
The gravity energy storage system according to any one of claims 1 to 4, characterized in that,

The storage area (15) has multiple positions, and the different positions are distributed on both sides of the shaft (13) in the first direction.
The gravity energy storage system according to claim 5 or 6, characterized in that,

Different positions of the storage area (15) are distributed on both sides of the shaft (13) in the third direction.
The gravity energy storage system according to any one of claims 1 to 8, characterized in that, the lifting device (12) includes an electromechanical group and a winch (11), and in the energy storage working condition, the electromechanical The output energy of the group moves a plurality of weights (14) fixed by the winch (11) from the shaft (13) to realize energy storage; A plurality of heavy objects (14) enter the shaft (13) and drive the electromechanical group to generate electricity to realize energy release.
The gravity energy storage system according to claim 9, characterized in that:

The lifting device (12) includes multiple sets of the electromechanical unit and the winch (11), and the multiple sets of the electromechanical unit and the winch (11) jointly hoist the same heavy object (14).
The gravity energy storage system according to any one of claims 1-10, characterized in that the total height of the plurality of weights (14) is not greater than one-third of the depth of the shaft (13).
The gravity energy storage system according to any one of claims 1-11, characterized in that the depth of the shaft (13) is greater than 100 meters.
The gravity energy storage system according to any one of claims 1-12, characterized in that the weight of a single weight (14) is not more than 500 tons.
The gravity energy storage system according to any one of claims 1-13, characterized in that, the depth of the shaft (13) is 500 meters, and the weight of the plurality of heavy objects (14) is 1750 tons.