Energy storage device and energy storage method

Abstract

The invention relates to the technical field of energy storage, and provides an energy storage device and an energy storage method.The energy storage device comprises a storage mechanism, a transmission mechanism, a containing mechanism and an energy conversion mechanism, and the storage mechanism comprises a weight block and a storage platform; the transmission mechanism comprises a first winding drum, a second winding drum, a first traction rope and a second traction rope, the first traction rope and the second traction rope are partially wound around the first winding drum, the winding directions of the first traction rope and the second traction rope are opposite, the first traction rope and the second traction rope are wound around the second winding drum, and second ends are provided with a first connecting part and a second connecting part respectively; when the height of one of the first connecting part and the second connecting part corresponds to the height of the storage platform, the height of the other one of the first connecting part and the second connecting part corresponds to the height of the containing mechanism; an input shaft of the energy conversion mechanism is in transmission connection with a rotating shaft of the first reel. Through the arrangement, when the weight block descends, the connecting part not connected with the weight block can be driven to ascend, a lifting driving device does not need to be additionally arranged, energy consumption is reduced, and power generation efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of energy storage technology, and in particular to an energy storage device and an energy storage method. Background Art

[0002] The intermittent and volatile nature of renewable energy sources, such as wind and solar power, creates grid-connected and accommodating challenges, making them a key challenge in building new power systems. Energy storage systems, which can perform multiple functions in power system operation, including peak shaving, frequency regulation, voltage regulation, backup, black start, and inertia response, are a key supporting technology for building these systems. Gravity energy storage, a type of energy storage technology based on mechanical energy conversion, works by storing energy by lifting an object to a height and releasing it when needed by lowering it, thereby driving a generator to generate electricity.

[0003] In current gravity energy storage systems, the power input end of the generator is connected to a heavy object through a mechanical transmission mechanism. When the heavy object descends, the mechanical transmission mechanism drives the generator to rotate, thereby converting the gravitational potential energy into electrical energy for power generation. The mechanical transmission mechanism has a connecting portion for connecting to a heavy object. After the connecting portion and one of the heavy objects descend to the lowest position together, it is necessary to separate the connecting portion from the heavy object and lift the connecting portion to a higher position before connecting the connecting portion to the heavy object at the higher position to descend again for power generation. For the process of the connecting portion rising from a lower position to a higher position, the connecting portion needs to be equipped with a driving device. During the process of potential energy power generation in the gravity energy storage system, the driving device needs to frequently lift the connecting portion, which consumes a large amount of electrical energy. The power loss during the power generation process of the energy storage system is large, and the power generation efficiency is low.

[0004] Therefore, how to solve the problems of large power loss and low power generation efficiency during the power generation process of the gravity energy storage system in the related technology has become an important technical problem to be solved by technical personnel in this field. Summary of the Invention

[0005] The present invention provides an energy storage device and an energy storage method, which are used to solve the defects of gravity energy storage systems in related technologies, such as large power loss and low power generation efficiency during the power generation process.

[0006] The present invention provides an energy storage device, comprising: The storage mechanism includes a weight block and a storage platform, wherein a plurality of the weight blocks are provided and the plurality of the weight blocks are arranged on the storage platform; The transmission mechanism is arranged on a first side of the storage platform, and the transmission mechanism includes a first drum, a second drum, a first traction rope and a second traction rope, the first drum and the second drum are both capable of rotating around a fixed axis, the first traction rope and the second traction rope are both partially wound around the first drum, the first end of the first traction rope and the first end of the second traction rope are both fixedly connected to the first drum, the winding direction of the first traction rope on the first drum is opposite to the winding direction of the second traction rope on the first drum, the second end of the first traction rope and the second end of the second traction rope are both suspended downward after winding around the second drum, the second end of the first traction rope is provided with a first connecting portion, and the second end of the second traction rope is provided with a second connecting portion, the first connecting portion and the second connecting portion are suitable for connecting to the weight block; a receiving mechanism adapted to receive the heavy object, wherein the receiving mechanism is located at a height lower than the storage platform, and when the height of one of the first connecting portion and the second connecting portion corresponds to the storage platform, the height of the other corresponds to the receiving mechanism; An energy conversion mechanism, wherein the input shaft of the energy conversion mechanism is drivingly connected to the rotating shaft of the first reel.

[0007] According to an energy storage device provided by the present invention, a first winding groove and a second winding groove are provided on the outer peripheral wall of the first winding drum, and the first winding groove and the second winding groove are respectively located at two ends of the first winding drum; The first winding groove extends spirally around the axis of the first drum, and the spiral direction of the first winding groove is the same as the winding direction of the first traction rope; The second winding groove extends spirally around the axis of the second drum, and the spiral direction of the second winding groove is the same as the winding direction of the second traction rope.

[0008] According to an energy storage device provided by the present invention, the storage platform is provided with at least two layers, and the storage platforms of each layer are spaced apart in the vertical direction; Each layer of the storage platform corresponds to a second reel, a first traction rope and a second traction rope, each of the first traction ropes and each of the second traction ropes are partially wound around the first reel, and the first end of each of the first traction ropes and the first end of each of the second traction ropes are fixedly connected to the first reel.

[0009] According to an energy storage device provided by the present invention, the weight block is provided with a lifting ring, the first connecting portion and the second connecting portion both include hooks, and the hooks are suitable for hooking the lifting ring; The hook has an opening and closing component, which can switch between an open state and a closed state. In the open state, the hanging ring can enter and exit the hooking space of the hook. In the closed state, the opening and closing component restricts the hanging ring from entering and exiting the hooking space.

[0010] According to an energy storage device provided by the present invention, the storage mechanism further includes: A transfer assembly, disposed on the storage platform; A support platform is escalably disposed above the transfer assembly, and the support platform is suitable for supporting the heavy object; The lifting assembly is arranged between the support platform and the transfer assembly. The lifting assembly is suitable for driving the support platform to rise and fall relative to the transfer assembly. The transfer assembly is suitable for driving the lifting assembly and the support platform to move relative to the storage platform.

[0011] An energy storage device according to the present invention further includes: a lifting mechanism disposed on the second side of the storage platform, the receiving mechanism being adapted to receive the heavy object block below the second reel and transfer the heavy object block to the lifting mechanism, and the lifting mechanism being adapted to lift the heavy object block to the storage platform; The conveying mechanism is arranged between the lifting mechanism and the storage platform, and is suitable for receiving the heavy object block lifted by the lifting mechanism and conveying the heavy object block to the transfer assembly on the storage platform.

[0012] According to an energy storage device provided by the present invention, the lifting mechanism includes a stacker; The conveying mechanism includes a conveyor belt mechanism, and the conveying direction of the conveying mechanism is parallel to the distribution direction of the lifting mechanism and the storage platform; The receiving mechanism and the transfer assembly both include an automatic guided vehicle or a rail-guided vehicle. The first side and the second side of the storage platform are opposite sides of the storage platform. The height of the first side of the storage platform is lower than the height of the second side of the storage platform.

[0013] According to an energy storage device provided by the present invention, the energy conversion mechanism includes: dynamo; A battery is electrically connected to the generator, and the battery is suitable for storing the electrical energy converted by the generator.

[0014] An energy storage device according to the present invention further includes: The control mechanism, the opening and closing component, the transfer component, the lifting component, the lifting mechanism, the receiving mechanism and the conveying mechanism are all electrically connected to the control mechanism.

[0015] The present invention further provides an energy storage method, based on the above energy storage device, the energy storage method comprising: During periods of low energy consumption, each heavy block is lifted to the storage platform; During the peak energy consumption period, each of the weight blocks is lowered in sequence to drive the energy conversion mechanism to operate; The step of causing each of the weight blocks to descend in sequence comprises: The first of the first and second connecting parts is connected to the first weight block of the weight blocks, and the first weight block is separated from the storage platform. When the first weight block is lowered to the receiving mechanism, the second of the first and second connecting parts is raised to a height corresponding to the storage platform, and the first of the first and second connecting parts is separated from the first weight block. The second of the first connecting part and the second connecting part is connected to the second weight block in the weight blocks, and the second weight block is separated from the storage platform. When the second weight block descends to the receiving mechanism, the first of the first connecting part and the second connecting part rises to a height corresponding to the storage platform, and the second of the first connecting part and the second connecting part is separated from the second weight block.

[0016] The energy storage device provided by the present invention includes a storage mechanism, a transmission mechanism, a receiving mechanism and an energy conversion mechanism. The storage mechanism includes a weight block and a storage platform, and the storage platform is located at a certain height and is used to support the weight block. There are multiple weight blocks, and the multiple weight blocks are all set on the storage platform. The transmission mechanism is set on the first side of the storage platform, and the transmission mechanism includes a first drum, a second drum, a first traction rope and a second traction rope. The first drum and the second drum are both able to rotate around a fixed axis. The first traction rope and the second traction rope are both partially wound around the first drum, and the first end of the first traction rope and the first end of the second traction rope are both fixedly connected to the first drum. The second end of the first traction rope and the second end of the second traction rope are both suspended downward after winding around the second drum, and the second end of the first traction rope is provided with a first connecting portion, and the second end of the second traction rope is provided with a second connecting portion. The first connecting portion and the second connecting portion are used to connect the weight block. The winding direction of the first traction rope on the first drum is opposite to the winding direction of the second traction rope on the first drum. When the first connecting portion is connected to a weighted object, under the action of the weighted object's gravity, the first connecting portion and the second end of the first traction rope descend downward with the weighted object. The first reel gradually releases the first traction rope under the action of the first traction rope, causing the first connecting portion to gradually descend. At this time, the second traction rope is gradually reeled in by the first reel, and the second connecting portion and the second end of the second traction rope gradually rise. Similarly, when the second connecting portion is connected to a weighted object, under the action of the weighted object's gravity, the second connecting portion and the second end of the second traction rope descend downward with the weighted object. The first reel gradually releases the second traction rope under the action of the second traction rope, causing the second connecting portion to gradually descend. At this time, the first traction rope is gradually reeled in by the first reel, and the first connecting portion and the second end of the first traction rope gradually rise. The receiving mechanism is used to receive the weighted object. The receiving mechanism is located at a height lower than the height of the storage platform. When the weighted object descends from the storage platform, it can land on the receiving mechanism. When the height of one of the first connecting portion and the second connecting portion corresponds to the storage platform, the height of the other corresponds to the receiving mechanism. When the weight block connected to the first connecting part falls on the receiving mechanism, the second connecting part can just connect to the weight block on the storage platform. When the weight block connected to the second connecting part falls on the receiving mechanism, the first connecting part can just connect to the weight block on the storage platform. The input shaft of the energy conversion mechanism is connected to the rotating shaft of the first reel. During the descent of the weight block, the first reel will rotate around a fixed axis under the action of the first traction rope or the second traction rope, thereby driving the input shaft of the energy conversion mechanism to rotate, inputting torque to the input shaft, and making the energy conversion mechanism operate to achieve energy conversion. In this way, at the same time, only one of the first connecting part and the second connecting part is connected to the weight block. When the first connecting part descends with the weight block, it can drive the second connecting part to rise; when the second connecting part descends with the weight block, it can drive the first connecting part to rise.In other words, when the weighted block descends, it can drive the connecting portion not connected to the weighted block upward, eliminating the need for additional lifting drive devices for the first and second connecting portions. This avoids the energy consumption of the lifting drive devices, reduces losses during energy conversion, and helps improve energy conversion efficiency. When a generator is used as the energy conversion mechanism, it can effectively solve the problems of large energy losses and low power generation efficiency during the power generation process of gravity energy storage systems in related technologies. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a front view of the energy storage device provided by the present invention (the energy conversion mechanism is not shown).

[0019] Figure 2 It is a structural schematic diagram of the transmission mechanism provided by the present invention.

[0020] Figure 3 It is a side view of the energy storage device provided by the present invention.

[0021] Reference numerals: 1. Weight block; 2. Storage platform; 3. First reel; 4. Second reel; 5. First traction rope; 6. Second traction rope; 7. Receiving mechanism; 8. First connecting part; 9. Second connecting part; 10. Transfer assembly; 11. Lifting mechanism; 12. Conveying mechanism; 13. Generator; 14. Fixed pulley; 15. Hydraulic coupling; 16. Gearbox. DETAILED DESCRIPTION

[0022] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0023] The following combination Figures 1 to 3 The energy storage device of the present invention is described.

[0024] like Figures 1 to 3 As shown, the energy storage device provided by the embodiment of the present invention includes a storage mechanism, a transmission mechanism, a receiving mechanism 7 and an energy conversion mechanism.

[0025] Specifically, the storage mechanism includes a weight block 1 and a storage platform 2. The storage platform 2 is located at a certain height and is used to support the weight block 1. There are multiple weight blocks 1, and the multiple weight blocks 1 are all set on the storage platform 2.

[0026] The weight block 1 is a solid weight with high energy density, which can be made of, but not limited to, high-density materials such as concrete blocks, metal blocks, sand and gravel, and waste tires. The material cost is low and it is easy to obtain.

[0027] The transmission mechanism is arranged on the first side of the storage platform 2, and the transmission mechanism includes a first reel 3, a second reel 4, a first traction rope 5 and a second traction rope 6. The first reel 3 and the second reel 4 can both rotate around a fixed axis.

[0028] The first traction rope 5 and the second traction rope 6 are both partially wound around the first drum 3, and the first end of the first traction rope 5 and the first end of the second traction rope 6 are both fixedly connected to the first drum 3. The second end of the first traction rope 5 and the second end of the second traction rope 6 are both wound around the second drum 4 and hang downward. The second end of the first traction rope 5 is provided with a first connecting portion 8, and the second end of the second traction rope 6 is provided with a second connecting portion 9. The first connecting portion 8 and the second connecting portion 9 are used to connect to the weight 1. The winding direction of the first traction rope 5 on the first drum 3 is opposite to the winding direction of the second traction rope 6 on the first drum 3.

[0029] When the first connecting portion 8 is connected to the weight block 1, under the action of the gravity of the weight block 1, the first connecting portion 8 and the second end of the first traction rope 5 fall downward with the weight block 1. The first reel 3 gradually releases the first traction rope 5 under the action of the first traction rope 5, so that the first connecting portion 8 gradually descends. At this time, the second traction rope 6 is gradually reeled in by the first reel 3, and the second connecting portion 9 and the second end of the second traction rope 6 gradually rise.

[0030] Similarly, when the second connecting portion 9 is connected to the weight block 1, under the action of the gravity of the weight block 1, the second connecting portion 9 and the second end of the second traction rope 6 fall downward with the weight block 1, and the first reel 3 gradually releases the second traction rope 6 under the action of the second traction rope 6, so that the second connecting portion 9 gradually descends. At this time, the first traction rope 5 is gradually reeled in by the first reel 3, and the first connecting portion 8 and the second end of the first traction rope 5 gradually rise.

[0031] The receiving mechanism 7 is used to receive the heavy object block 1. The height of the receiving mechanism 7 is lower than the height of the storage platform 2. When the heavy object block 1 falls from the storage platform 2, it can fall on the receiving mechanism 7. When the height of one of the first connecting portion 8 and the second connecting portion 9 corresponds to the storage platform 2, the height of the other corresponds to the receiving mechanism 7. When the heavy object block 1 connected to the first connecting portion 8 falls on the receiving mechanism 7, the second connecting portion 9 can just connect to the heavy object block 1 on the storage platform 2. When the heavy object block 1 connected to the second connecting portion 9 falls on the receiving mechanism 7, the first connecting portion 8 can just connect to the heavy object block 1 on the storage platform 2.

[0032] The energy conversion mechanism has an input shaft that is in driving connection with the rotating shaft of the first drum 3. During the descent of the weight 1, the first drum 3 rotates around its axis under the action of the first traction rope 5 or the second traction rope 6, thereby driving the input shaft of the energy conversion mechanism to rotate, inputting torque to the input shaft, and operating the energy conversion mechanism to achieve energy conversion.

[0033] With such an arrangement, at the same time, only one of the first connection part 8 and the second connection part 9 is connected to the weight block 1. When the first connection part 8 descends with the weight block 1, it can drive the second connection part 9 to rise; when the second connection part 9 descends with the weight block 1, it can drive the first connection part 8 to rise. In other words, when the weight block 1 descends, it can drive the connection part that is not connected to the weight block 1 to rise, and there is no need to additionally equip the first connection part 8 and the second connection part 9 with a lifting drive device, which avoids the energy consumption of the lifting drive device, reduces the loss during energy conversion, and is conducive to improving the energy conversion efficiency. When the generator 13 is selected as the above-mentioned energy conversion mechanism, it can effectively solve the problems of large power loss and low power generation efficiency in the power generation process of the gravity energy storage system in the related art.

[0034] The energy storage device provided in this embodiment stores the gravitational potential energy of the weight block 1 and releases it in a timely manner to generate the required energy. This reduces dependence on geographical conditions, is cost-effective, and has a long lifespan. By utilizing the physical properties of the weight block 1, the consumption and pollution of chemical substances are avoided, with minimal impact on the ecological environment.

[0035] The height difference between the storage platform 2 and the receiving mechanism 7 can be achieved with the help of underground shafts, abandoned mines or other existing buildings, thereby reducing construction costs and environmental impacts.

[0036] The above-mentioned first traction rope 5 and second traction rope 6 can be but are not limited to steel wire ropes. It is necessary to ensure the consistency of parameters such as strength and elasticity of the first traction rope 5 and the second traction rope 6 to ensure the stability of the movement state of the heavy object 1 during the lifting process and reduce the system imbalance caused by the difference in the traction ropes.

[0037] In the embodiment of the present invention, a first winding groove and a second winding groove are provided on the outer peripheral wall of the first winding drum 3 , and the first winding groove and the second winding groove are respectively located at two ends of the first winding drum 3 .

[0038] The first winding groove extends spirally around the axis of the first drum 3. The spiral direction of the first winding groove is the same as the winding direction of the first traction rope 5. The first winding groove is for winding the first traction rope 5 and can guide the winding of the first traction rope 5 on the first drum 3, so that the first traction rope 5 is wound neatly on the first drum 3 to avoid winding chaos.

[0039] The second winding groove extends spirally around the axis of the second drum 4. The spiral direction of the second winding groove is the same as the winding direction of the second traction rope 6. The second winding groove is for winding the second traction rope 6 and can guide the winding of the second traction rope 6 on the first drum 3, so that the second traction rope 6 is wound neatly on the first drum 3 to avoid winding chaos.

[0040] In the embodiment of the present invention, the storage platform 2 is provided with at least two layers, and the storage platforms 2 on each layer are spaced apart in the vertical direction. Each layer of the storage platform 2 stores a plurality of weight blocks 1. The weight blocks 1 on each layer of the storage platform 2 are arranged in rows and columns and stored in an orderly manner.

[0041] Each storage platform 2 corresponds to a second reel 4, a first traction rope 5 and a second traction rope 6. Each first traction rope 5 and each second traction rope 6 are partially wound around the first reel 3, and the first end of each first traction rope 5 and the first end of each second traction rope 6 are fixedly connected to the first reel 3.

[0042] The heavy blocks 1 on each layer of the storage platform 2 are connected to the first traction rope 5 or the second traction rope 6 corresponding to the storage platform 2 on that layer, so as to realize the descent of the heavy blocks 1 on each layer of the storage platform 2. The descent of the heavy blocks 1 on each layer of the storage platform 2 can drive the first reel 3 to rotate, so as to drive the energy conversion mechanism to perform energy conversion.

[0043] When the energy storage device provided in this embodiment is in operation, at the same time, only one of each first connection portion 8 and each second connection portion 9 is connected to the weight block 1. In a specific embodiment, the first traction rope 5 or the second traction rope 6 corresponding to one layer of the storage platform 2 can be connected to the weight block 1. When all the weight blocks 1 on the storage platform 2 on that layer have fallen onto the receiving mechanism 7, the first traction rope 5 or the second traction rope 6 corresponding to another layer of the storage platform 2 can be connected to the weight block 1, and so on, layer by layer.

[0044] It should be noted that when the heavy blocks 1 on each layer of storage platform 2 are lowered to release energy, it is necessary to use the warehouse management system (WMS) and warehouse control system (WCS) control algorithms to optimize path planning and equipment scheduling to achieve efficient energy release of the energy storage system.

[0045] In order to avoid interference between any two of the first traction ropes 5 and the second traction ropes 6, a fixed pulley 14 can be arranged at the part of each first traction rope 5 located between the second drum 4 and the first drum 3 and at the part of each second traction rope 6 located between the second drum 4 and the first drum 3.

[0046] In this embodiment, a lifting ring is provided on the weight block 1, and both the first connecting portion 8 and the second connecting portion 9 include hooks capable of hooking onto the lifting ring. The hooks and the lifting rings cooperate to achieve a detachable connection between the first traction rope 5 and the weight block 1, and a detachable connection between the second traction rope 6 and the weight block 1, which facilitates operation and improves efficiency.

[0047] The hook has an opening and closing component that can switch between an open state and a closed state. When the opening and closing component is switched to the open state, the lifting ring can enter and exit the hook's hooking space, connecting the hook to the lifting ring, or disconnecting the hook from the lifting ring. When the opening and closing component is switched to the closed state, the opening and closing component can restrict the lifting ring from entering and exiting the hook's hooking space, especially when the hook is connected to the lifting ring, which can prevent the lifting ring from being disconnected from the hook, thereby improving the connection reliability of the first traction rope 5 and the weight block 1, as well as the connection reliability of the second traction rope 6 and the weight block 1.

[0048] In this embodiment of the present invention, the storage mechanism further includes a transfer assembly 10, a support platform, and a lifting assembly. The transfer assembly 10 is disposed on the storage platform 2, and the support platform is escalably disposed above the transfer assembly 10. The support platform is used to support the heavy object 1. The lifting assembly is disposed between the support platform and the transfer assembly 10. The lifting assembly is used to drive the support platform to rise and fall relative to the transfer assembly 10, and the transfer assembly 10 is used to drive the lifting assembly and the support platform to move relative to the storage platform 2.

[0049] With this arrangement, when the first connecting portion 8 rises to a height corresponding to the storage platform 2, the moving assembly drives the lifting assembly, the support platform, and the weight block 1 located on the support platform to move closer to the first connecting portion 8. Then, based on the height of the lifting ring on the weight block 1 and the first connecting portion 8, the lifting assembly drives the support platform to rise and fall, so that the lifting ring on the weight block 1 is aligned with the hook of the first connecting portion 8. The transfer assembly 10 is used to move the weight block 1 closer to the first connecting portion 8, allowing the lifting ring on the weight block 1 to be placed on the hook. The lifting assembly then drives the support platform down, allowing the weight block 1 to be hung on the hook. To disengage the weight block 1 from the hook, the lifting assembly first drives the support platform up, and then the transfer assembly 10 moves the weight block 1 away from the hook. The process of connecting the weight block 1 to the second connecting portion 9 is the same as the process of connecting the weight block 1 to the first connecting portion 8. The process of separating the weight block 1 from the second connecting portion 9 is the same as the process of separating the weight block 1 from the first connecting portion 8, and will not be repeated here.

[0050] The lifting assembly can be, but is not limited to, a cam assembly, a hydraulic cylinder, etc.

[0051] In the embodiment of the present invention, the energy storage device further includes a lifting mechanism 11 and a conveying mechanism 12 .

[0052] The lifting mechanism 11 is provided on the second side of the storage platform 2 , and the receiving mechanism 7 can receive the heavy object block 1 below the second reel 4 and transfer the received heavy object block 1 to the lifting mechanism 11 . The lifting mechanism 11 is used to lift the heavy object block 1 to the storage platform 2 .

[0053] The conveying mechanism 12 is disposed between the lifting mechanism 11 and the storage platform 2 . The conveying mechanism 12 can receive the heavy object block 1 lifted by the lifting mechanism 11 and convey the heavy object block 1 to the transfer assembly 10 on the storage platform 2 .

[0054] This arrangement enables a cyclic operation of the storage device. Specifically, during periods of low energy consumption, such as periods of low electricity consumption, the receiving mechanism 7, the lifting mechanism 11, and the conveying mechanism 12 can be used to store the weight blocks 1 on each layer of the storage platform 2 to store gravitational potential energy. During periods of peak energy consumption, such as periods of peak electricity consumption, the weight blocks 1 on each layer are simply lowered sequentially to convert the gravitational potential energy into a target form of energy, such as electricity. After the weight blocks 1 on each layer have landed on the receiving mechanism 7, they are temporarily not lifted until the period of low energy consumption arrives.

[0055] In this embodiment, the lifting mechanism 11 includes a stacker, which has a fork mechanism that can be raised and lowered and can be extended and retracted. Through the extension and lifting of the fork mechanism, the heavy object block 1 on the receiving mechanism 7 can be forked, and the heavy object block 1 can be lifted upward and released to the conveying mechanism 12.

[0056] The conveying mechanism 12 includes a conveyor belt mechanism, one for each storage platform 2. The conveying direction of the conveying mechanism 12 is parallel to the distribution direction of the lifting mechanism 11 and the storage platform 2. When placing the heavy object 1 on the conveying mechanism 12, it is necessary to ensure that the transfer assembly 10 is located at the end of the conveying mechanism 12 and that the upper surface of the support platform is flush with the conveying surface of the conveying mechanism 12. Under the action of the conveying mechanism 12, the heavy object 1 will gradually move toward the support platform until the heavy object 1 completely breaks contact with the conveying mechanism 12 and the heavy object 1 is able to be placed on the support platform.

[0057] The receiving mechanism 7 and the transfer assembly 10 both include an automated guided vehicle (AGV) or a rail guided vehicle (RGV). Both AGV and RGV have the functions of movement, positioning, and carrying.

[0058] The first side and the second side of the storage platform 2 are opposite sides of the storage platform 2. In this embodiment, the height of the first side of the storage platform 2 can be made lower than the height of the second side of the storage platform 2. That is to say, the storage platform 2 is tilted to reduce the transfer resistance of the transfer component 10 on the storage platform 2, thereby reducing the energy consumption of the transfer component 10.

[0059] At this time, a limiting structure can be provided at one end of the storage platform 2 close to the transmission mechanism to prevent the transfer assembly 10 from sliding off the storage platform 2 and improve safety.

[0060] In some embodiments, the energy conversion mechanism includes a generator 13 and a battery.

[0061] The input shaft of the generator 13 is in driving connection with the rotating shaft of the first drum 3 . When the input shaft of the generator 13 rotates, the generator 13 runs to generate electricity.

[0062] The battery is electrically connected to the generator 13. The battery can store the electric energy converted by the generator 13 and output the electric energy in a timely manner as needed.

[0063] It should be noted that the electric energy converted by the generator 13 can be directly connected to the power grid as long as the stability of the generated electric energy is ensured.

[0064] In other embodiments, the energy conversion mechanism includes a hydraulic pump and an accumulator.

[0065] The input shaft of the hydraulic pump is in driving connection with the rotating shaft of the first reel 3. When the input shaft of the hydraulic pump rotates, the hydraulic pump runs and outputs hydraulic energy.

[0066] The accumulator is connected to the hydraulic pump. The accumulator can store the hydraulic energy converted by the hydraulic pump and output it to the hydraulic pump in a timely manner as needed.

[0067] The energy conversion mechanism further includes a hydraulic coupling 15 and a gear box 16 , and the generator 13 or the hydraulic pump is connected to the first reel 3 via the hydraulic coupling 15 and the gear box 16 .

[0068] In the embodiment of the present invention, the energy storage device further includes a control mechanism, and the opening and closing assembly, the transfer assembly 10, the lifting assembly, the lifting mechanism 11, the receiving mechanism 7 and the conveying mechanism 12 are all electrically connected to the control mechanism.

[0069] The use of sensors can be combined to monitor the position and descent speed of the heavy object 1, the status of the energy storage device and the energy conversion efficiency, and according to the grid demand and the energy storage status, the opening and closing components, the transfer components 10, the lifting components, the lifting mechanism 11, the receiving mechanism 7 and the conveying mechanism 12 are controlled by the control mechanism to realize the automatic control of the energy storage device and reduce the operation and maintenance costs. According to the detection of the output parameters of the energy conversion mechanism, the opening and closing components, the transfer components 10, the lifting components, the lifting mechanism 11, the receiving mechanism 7 and the conveying mechanism 12 can be regulated to realize the stable conversion of energy and optimize the energy conversion efficiency, so as to meet the large-scale energy storage needs at the grid level and support long-term energy storage and release.

[0070] In summary, the energy storage device provided by the embodiment of the present invention is suitable for large-scale, long-term energy storage and has the advantages of being environmentally friendly, low cost and long life.

[0071] On the other hand, the present invention also provides an energy storage method based on the energy storage device provided in any of the above embodiments. The energy storage method described below and the energy storage device described above can be referenced to each other.

[0072] The energy storage method provided in the embodiment of the present invention includes steps 110 to 120 .

[0073] Step 110: During the low energy consumption period, each heavy object block is lifted to the storage platform.

[0074] Step 120: During the peak energy consumption period, each weight block is lowered in sequence to drive the energy conversion mechanism to operate.

[0075] The energy consumption valley period can be, but is not limited to, the electricity consumption valley period, and correspondingly, the energy consumption peak period can be, but is not limited to, the electricity consumption peak period. However, when the energy storage device is operating, the energy consumption valley period and the energy consumption peak period refer to the same energy consumption conditions.

[0076] Among them, the step of lowering each weight block in sequence in step 120 includes step 121 and step 122.

[0077] Step 121: connect the first of the first connecting part and the second connecting part to the first weight block in the weight blocks, and separate the first weight block from the storage platform. When the first weight block descends to the receiving mechanism, the second of the first connecting part and the second connecting part rises to a height corresponding to the storage platform, and separates the first of the first connecting part and the second connecting part from the first weight block.

[0078] Step 122: Connect the second one of the first connecting part and the second connecting part to the second heavy block in the heavy blocks, and separate the second heavy block from the storage platform. When the second heavy block descends to the receiving mechanism, the first one of the first connecting part and the second connecting part rises to a height corresponding to the storage platform, and separates the second one of the first connecting part and the second heavy block from the connection.

[0079] The above steps 121 and 122 are performed alternately in a cycle, and the gravitational potential energy of each weight block 1 can be converted into other forms of energy in turn.

[0080] The derivation process of the beneficial effects of the energy storage method in the embodiment of the present invention is generally similar to the derivation process of the beneficial effects of the above-mentioned energy storage device, so it will not be repeated here.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. An energy storage device, characterized in that: include: A storage mechanism comprises a weight block (1) and a storage platform (2), wherein a plurality of the weight blocks (1) are provided, and the plurality of weight blocks (1) are arranged on the storage platform (2); A transmission mechanism is provided on the first side of the storage platform (2), the transmission mechanism comprising a first drum (3), a second drum (4), a first traction rope (5) and a second traction rope (6), the first drum (3) and the second drum (4) both being capable of rotating about a fixed axis, the first traction rope (5) and the second traction rope (6) both being partially wound around the first drum (3), the first end of the first traction rope (5) and the first end of the second traction rope (6) both being fixedly connected to the first drum (3), the winding direction of the first traction rope (5) on the first drum (3) being opposite to the winding direction of the second traction rope (6) on the first drum (3), the second end of the first traction rope (5) and the second end of the second traction rope (6) both being suspended downward after winding around the second drum (4), the second end of the first traction rope (5) being provided with a first connecting portion (8), the second end of the second traction rope (6) being provided with a second connecting portion (9), the first connecting portion (8) and the second connecting portion (9) being suitable for connecting to the weight block (1); a receiving mechanism (7) adapted to receive the heavy object (1); the receiving mechanism (7) is located at a height lower than the storage platform (2); when the height of one of the first connecting portion (8) and the second connecting portion (9) corresponds to the storage platform (2), the height of the other corresponds to the receiving mechanism (7); An energy conversion mechanism, wherein an input shaft of the energy conversion mechanism is in transmission connection with a rotating shaft of the first reel (3).

2. The energy storage device according to claim 1, characterized in that A first winding groove and a second winding groove are provided on the outer peripheral wall of the first winding drum (3), and the first winding groove and the second winding groove are respectively located at two ends of the first winding drum (3); The first winding groove extends spirally around the axis of the first reel (3), and the spiral direction of the first winding groove is the same as the winding direction of the first traction rope (5); The second winding groove extends spirally around the axis of the second drum (4), and the spiral direction of the second winding groove is the same as the winding direction of the second traction rope (6).

3. The energy storage device according to claim 1, characterized in that The storage platform (2) is provided with at least two layers, and the storage platforms (2) on each layer are spaced apart in the vertical direction; Each layer of the storage platform (2) corresponds to a second drum (4), a first traction rope (5) and a second traction rope (6); each of the first traction ropes (5) and each of the second traction ropes (6) is partially wound around the first drum (3); and the first end of each of the first traction ropes (5) and the first end of each of the second traction ropes (6) are fixedly connected to the first drum (3).

4. The energy storage device according to any one of claims 1 to 3, characterized in that: The weight block (1) is provided with a lifting ring, and the first connecting portion (8) and the second connecting portion (9) both include hooks, and the hooks are suitable for hooking the lifting ring; The hook has an opening and closing component, which can switch between an open state and a closed state. In the open state, the hanging ring can enter and exit the hooking space of the hook. In the closed state, the opening and closing component restricts the hanging ring from entering and exiting the hooking space.

5. The energy storage device according to claim 4, characterized in that The storage mechanism further comprises: A transfer assembly (10) is arranged on the storage platform (2); A support platform is escalably arranged above the transfer assembly (10), and the support platform is suitable for supporting the heavy object (1); A lifting assembly is arranged between the support platform and the transfer assembly (10), the lifting assembly is suitable for driving the support platform to rise and fall relative to the transfer assembly (10), and the transfer assembly (10) is suitable for driving the lifting assembly and the support platform to move relative to the storage platform (2).

6. The energy storage device according to claim 5, characterized in that Also includes: A lifting mechanism (11) is provided on the second side of the storage platform (2); the receiving mechanism (7) is adapted to receive the heavy object block (1) below the second reel (4) and transfer the heavy object block (1) to the lifting mechanism (11); and the lifting mechanism (11) is adapted to lift the heavy object block (1) to the storage platform (2); A conveying mechanism (12) is provided between the lifting mechanism (11) and the storage platform (2), and the conveying mechanism (12) is suitable for receiving the heavy object block (1) lifted by the lifting mechanism (11) and conveying the heavy object block (1) to the transfer assembly (10) on the storage platform (2).

7. The energy storage device according to claim 6, characterized in that The lifting mechanism (11) includes a stacker; The conveying mechanism (12) comprises a conveyor belt mechanism, and the conveying direction of the conveying mechanism (12) is parallel to the distribution direction of the lifting mechanism (11) and the storage platform (2); The receiving mechanism (7) and the transfer assembly (10) both include an automatic guided vehicle or a rail-guided vehicle, the first side and the second side of the storage platform (2) are opposite sides of the storage platform (2), and the height of the first side of the storage platform (2) is less than the height of the second side of the storage platform (2).

8. The energy storage device according to any one of claims 1 to 3, characterized in that: The energy conversion mechanism comprises: generator (13); A battery is electrically connected to the generator (13), and the battery is suitable for storing the electrical energy converted by the generator (13).

9. The energy storage device according to claim 6, characterized in that Also includes: The control mechanism, the opening and closing component, the transfer component (10), the lifting component, the lifting mechanism (11), the receiving mechanism (7) and the conveying mechanism (12) are all electrically connected to the control mechanism.

10. An energy storage method, characterized in that: Based on the energy storage device according to any one of claims 1 to 9, the energy storage method comprises: During the low energy consumption period, each heavy object block (1) is lifted to the storage platform (2); During the peak energy consumption period, each of the weight blocks (1) is lowered in sequence to drive the energy conversion mechanism to operate; Wherein, the step of causing each of the weight blocks (1) to descend in sequence comprises: The first of the first connecting portion (8) and the second connecting portion (9) is connected to the first weight block (1) in the weight blocks (1), and the first weight block (1) is separated from the storage platform (2); when the first weight block (1) descends to the receiving mechanism (7), the second of the first connecting portion (8) and the second connecting portion (9) is raised to a height corresponding to the storage platform (2), and the first of the first connecting portion (8) and the second connecting portion (9) is separated from the first weight block (1); The second of the first connecting portion (8) and the second connecting portion (9) is connected to the second weight block (1) in the weight block (1), and the second weight block (1) is separated from the storage platform (2). When the second weight block (1) descends to the receiving mechanism (7), the first of the first connecting portion (8) and the second connecting portion (9) is raised to a height corresponding to the storage platform (2), and the second of the first connecting portion (8) and the second connecting portion (9) is separated from the second weight block (1).

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