Energy storage system

Abstract

The invention relates to an energy storage system which comprises a liquid storage device, a hydraulic pump, an energy storage device and a power generation device, and the liquid storage device is used for storing a liquid medium and is provided with a first liquid inlet and a first liquid outlet which communicate with each other; the hydraulic pump is used for being electrically connected with a power supply and is provided with a second liquid inlet and a second liquid outlet which are communicated, and the second liquid inlet is communicated with the first liquid outlet; the energy storage device is provided with a hydraulic cavity, and the hydraulic cavity communicates with the second liquid outlet. The power generation device is provided with a third liquid inlet and a third liquid outlet, the third liquid inlet communicates with the hydraulic cavity, and the third liquid outlet communicates with the first liquid inlet. Compared with the prior art, the energy storage system supplements the electricity demand in the peak period of the power load through the circulation of the liquid medium, does not need specific geographical conditions, and is low in implementation cost.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage, and in particular to an energy storage system. Background Art

[0002] Renewable energy refers to energy that can be recycled and regenerated in nature, including solar energy, hydropower, wind energy, tidal energy, etc. Since the generation of renewable energy is not controlled by human power, traditional technology usually uses pumped storage to store renewable energy, that is, when the power load is low, the electricity generated by renewable energy is used to pump water from the lower pool reservoir to the upper pool reservoir. When the power load is peak, the water in the upper pool reservoir is released to the lower pool reservoir. The water flows down and drives the turbine to generate electricity, thereby supplementing the electricity demand during the peak power load period. However, this energy storage method requires specific geographical conditions and has high construction costs. Summary of the invention

[0003] Based on this, it is necessary to provide an energy storage system to address the problem that traditional energy storage methods require specific geographical conditions, resulting in high construction costs.

[0004] The technical solution is as follows:

[0005] One embodiment provides an energy storage system, including:

[0006] A liquid storage device, the liquid storage device is used to store a liquid medium and has a first liquid inlet and a first liquid outlet that are connected;

[0007] A hydraulic pump, the hydraulic pump is used to be electrically connected to a power source and has a second liquid inlet and a second liquid outlet that are connected to each other, wherein the second liquid inlet is connected to the first liquid outlet;

[0008] an energy storage device, the energy storage device having a hydraulic chamber, the hydraulic chamber being in communication with the second liquid outlet; and

[0009] A power generation device, wherein the power generation device has a third liquid inlet and a third liquid outlet, wherein the third liquid inlet is communicated with the hydraulic chamber, and the third liquid outlet is communicated with the first liquid inlet.

[0010] In the above energy storage system, during the low power load period, the power supply supplies power to the hydraulic pump, the hydraulic pump operates and sucks the liquid medium in the liquid storage device, so that the liquid medium enters the hydraulic cavity of the energy storage device after passing through the first liquid outlet, the second liquid inlet and the second liquid outlet in sequence. As the volume of the liquid medium in the hydraulic cavity gradually increases, the volume of the gas medium in the hydraulic cavity is compressed, so that the gas pressure in the hydraulic cavity increases, thereby accumulating energy; during the peak power load period, the volume of the gas medium expands and releases energy to the liquid medium. At this time, the liquid medium generates a certain kinetic energy and enters the power generation device through the third liquid inlet. The power generation device converts the kinetic energy of the liquid medium into electrical energy to supplement the electricity demand during the peak power load period. After power generation, the liquid medium returns to the liquid storage device through the first liquid inlet for subsequent circulation; compared with traditional technologies, the above energy storage system supplements the electricity demand during the peak power load period through the circulation of liquid medium, does not require specific geographical conditions, and has low implementation costs.

[0011] In one embodiment, the energy storage device includes a shell and an airbag, the shell is provided with the hydraulic cavity and the liquid guide port which are connected, the airbag is arranged in the hydraulic cavity and is used to store the gas medium, and the second liquid outlet and the third liquid inlet are both connected to the liquid guide port.

[0012] In one of the embodiments, the shell is provided with an inflation port, which is communicated with the hydraulic chamber, and the airbag is provided with an air inlet, which is communicated with the inflation port.

[0013] In one embodiment, the energy storage device further includes a liquid conducting valve, which is disposed at the liquid conducting port and is used to open or close the liquid conducting port.

[0014] In one embodiment, the liquid guiding valve includes a valve housing, a liquid blocking portion, a guide rod and a mounting platform. The valve housing is arranged at the liquid guiding port and has a liquid guiding channel. One end of the liquid guiding channel is connected to the hydraulic chamber, and the other end of the liquid guiding channel is connected to the second liquid outlet and the third liquid inlet. The liquid blocking portion is arranged at one end of the guide rod, and the shape of the liquid blocking portion matches the cross-sectional shape of the liquid guiding channel. The mounting platform is arranged in the liquid guiding channel and has a mounting hole. The guide rod passes through the mounting hole and can reciprocate along the axial direction of the mounting hole so that the liquid blocking portion opens or closes the liquid guiding channel.

[0015] In one embodiment, the liquid guiding valve further comprises an elastic member, wherein the elastic member is sleeved outside the guide rod, one end of the elastic member abuts against the liquid blocking portion, and the other end of the elastic member abuts against the mounting platform.

[0016] In one of the embodiments, the energy storage device further comprises a sealing ring, an inner ring of which is sleeved on the outside of the liquid guiding valve, and an outer ring of which is in contact with an inner wall of the hydraulic chamber.

[0017] In one of the embodiments, the energy storage device further includes an inflation valve, which is disposed at the air inlet and penetrates the air inlet, and the inflation valve is used to open or close the air inlet.

[0018] In one of the embodiments, the energy storage device further comprises a protective cover, which is disposed at the inflation port and sleeved outside the inflation valve.

[0019] In one embodiment, the energy storage system further includes a heat dissipation device, and the heat dissipation device is used to dissipate heat generated by the energy storage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] FIG. 1 is a schematic diagram of an energy storage system in one embodiment of the present application.

[0022] FIG. 2 is a schematic diagram of the structure of an energy storage device in one embodiment of the present application.

[0023] FIG. 3 is a schematic diagram of multiple energy storage devices connected in parallel in one embodiment of the present application.

[0024] Notes on the attached drawings:

[0025] 100, liquid storage device; 110, first liquid inlet; 120, first liquid outlet; 200, hydraulic pump; 210, second liquid inlet; 220, second liquid outlet; 300, energy storage device; 310, shell; 311, hydraulic chamber; 312, liquid guide port; 313, inflation port; 320, air bag; 321, air inlet; 330, liquid guide valve; 331, valve shell; 332, liquid blocking part; 333, guide rod; 334, mounting table; 340, sealing ring; 350, inflation valve; 360, protective cover; 400, power generation device; 410, third liquid inlet; 420, third liquid outlet; 500, transformer; 610, first valve; 620, second valve; 700, power supply. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0027] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0028] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0029] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0030] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0031] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0032] Please refer to Figures 1 and 2. An embodiment of the present application provides an energy storage system, including a liquid storage device 100, a hydraulic pump 200, an energy storage device 300 and a power generation device 400. The liquid storage device 100 is used to store liquid medium and has a first liquid inlet 110 and a first liquid outlet 120 that are connected; the hydraulic pump 200 is used to be electrically connected to a power source 700 and has a second liquid inlet 210 and a second liquid outlet 220 that are connected, and the second liquid inlet 210 is connected to the first liquid outlet 120; the energy storage device 300 has a hydraulic chamber 311, and the hydraulic chamber 311 is connected to the second liquid outlet 220; the power generation device 400 has a third liquid inlet 410 and a third liquid outlet 420, and the third liquid inlet 410 is connected to the hydraulic chamber 311, and the third liquid outlet 420 is connected to the first liquid inlet 110.

[0033] In the energy storage system described above, during the low power load period, the power supply 700 supplies power to the hydraulic pump 200, and the hydraulic pump 200 operates and pumps the liquid medium in the liquid storage device 100, so that the liquid medium enters the hydraulic chamber 311 of the energy storage device 300 through the first liquid outlet 120, the second liquid inlet 210 and the second liquid outlet 220 in sequence. As the volume of the liquid medium in the hydraulic chamber 311 gradually increases, the volume of the gas medium in the hydraulic chamber 311 is compressed, so that the gas pressure in the hydraulic chamber 311 increases, thereby accumulating energy. During the peak power load period, The volume of the gas medium expands and releases energy to the liquid medium. At this time, the liquid medium generates a certain amount of kinetic energy and enters the power generation device 400 through the third liquid inlet 410. The power generation device 400 converts the kinetic energy of the liquid medium into electrical energy to supplement the electricity demand during the peak period of power load. After power generation, the liquid medium flows back to the liquid storage device 100 through the first liquid inlet 110 for subsequent circulation. Compared with traditional technologies, the above-mentioned energy storage system supplements the electricity demand during the peak period of power load through the circulation of liquid media, does not require specific geographical conditions, and has low implementation costs.

[0034] In one embodiment, the liquid storage device 100 includes a liquid storage tank, which has a liquid storage cavity and a first liquid inlet 110 and a first liquid outlet 120 connected to the liquid storage cavity. The liquid storage cavity is used to store liquid medium, and the liquid medium can flow to the hydraulic cavity 311 through the first liquid outlet 120. The liquid medium flowing out of the hydraulic cavity 311 then enters and exits the liquid storage cavity through the first liquid inlet 110.

[0035] Furthermore, the liquid medium is hydraulic oil, which not only has good fluidity but also has good thermal conductivity, and can quickly transfer compression heat to prevent the energy storage device 300 from overheating.

[0036] In one embodiment, the gas medium in the hydraulic chamber 311 is nitrogen, which is low in cost, colorless, odorless, and highly stable. In other embodiments, it may be other chemically stable gases such as air, which will not be described in detail here.

[0037] In one embodiment, the power generation device 400 includes a hydraulic motor and a generator. The liquid medium with kinetic energy passes through the hydraulic motor, and the hydraulic motor converts the kinetic energy into mechanical energy. The output shaft of the hydraulic motor is connected to the rotor of the generator. The rotor of the generator rotates driven by the output shaft to generate electricity.

[0038] In other embodiments, the power generation device 400 may also be a hydro-turbine generator, etc., which will not be described in detail here.

[0039] Further, referring to FIG. 1 , the energy storage system further includes a transformer 500 , which is electrically connected to the generator to ensure the stability and safety of power transmission.

[0040] Due to the limitation of the volume size of the hydraulic cavity 311 of the energy storage device 300, in other embodiments, the energy storage device 300 is provided with at least two and arranged in parallel, so as to store more energy. The specific connection method is shown in FIG3 . When in use, it is necessary to ensure that the flow rate and pressure in each energy storage device 300 are within a safe range, and the liquid medium is transported to the hydraulic cavity 311 of each energy storage device 300 through the hydraulic pump 200 to ensure that the pressure in the hydraulic cavity 311 is less than the rated pressure, and the pressure difference between each energy storage device 300 is less than 5%, and the pressure difference can be controlled by adjusting the flow rate. Heat will be generated in the process of compression of the gas medium, and temperature monitoring is required to ensure that the heat of the energy storage device 300 is within a safe range. The energy storage device 300 can be cooled by adjusting the flow rate, adding air cooling, water cooling, etc.

[0041] It can be understood that the liquid storage device 100, the hydraulic pump 200, the energy storage device 300 and the power generation device 400 are all connected through pipelines, which will not be described in detail here.

[0042] Further, please refer to Figure 1, a first valve 610 is provided between the liquid storage device 100 and the hydraulic pump 200, and a second valve 620 is provided between the energy storage device 300 and the power generation device 400. The first valve 610 and the second valve 620 are used to control the opening and closing of the pipeline to control the operation of the energy storage system, which will not be repeated here.

[0043] Please refer to Figure 2. In one embodiment, the energy storage device 300 includes a shell 310 and an airbag 320. The shell 310 is provided with a hydraulic chamber 311 and a liquid guide port 312 that are connected to each other. The airbag 320 is arranged in the hydraulic chamber 311 and is used to store the gas medium. The second liquid outlet 220 and the third liquid inlet 410 are both connected to the liquid guide port 312.

[0044] During the low power load period, the hydraulic pump 200 transports the liquid medium to the hydraulic chamber 311 of the housing 310 through the liquid guide port 312. As the volume of the liquid medium in the hydraulic chamber 311 gradually increases, the airbag 320 arranged in the hydraulic chamber 311 is compressed, causing the volume of the gas medium in the airbag 320 to be compressed, thereby accumulating energy; during the peak power load period, the volume of the gas medium in the airbag 320 expands, causing the overall volume of the airbag 320 to expand and release energy to the liquid medium for subsequent power generation; such a configuration can avoid the influence of gas-liquid mixing on the energy storage system, and can also avoid the oxidation of the liquid medium, thereby increasing the service life of the liquid medium.

[0045] Please refer to Figure 2. In one embodiment, the airbag 320 is made of a flexible material and has good ductility, and can expand and change within a certain range; further, when the gas medium is injected into the airbag 320 and the liquid medium is not introduced into the hydraulic chamber 311, the airbag 320 expands and can almost fill the entire hydraulic chamber 311. When the liquid medium gradually enters the hydraulic chamber 311, the airbag 320 is gradually compressed, so that the volume of the gas medium in the airbag 320 is also gradually compressed, thereby accumulating energy; when the power load is at a peak, the volume of the gas medium in the airbag 320 expands, so that the overall volume of the airbag 320 expands and gradually fills the entire hydraulic chamber 311, so as to release energy to the liquid medium and perform subsequent power generation.

[0046] In one embodiment, the energy storage system further includes a liquid guiding main pipe, a first liquid guiding branch pipe, and a second liquid guiding branch pipe. One end of the liquid guiding main pipe is connected to the liquid guiding port 312 of the shell 310, and the other end of the liquid guiding main pipe is connected to one end of the first liquid guiding branch pipe and one end of the second liquid guiding branch pipe. The other end of the first liquid guiding branch pipe is connected to the second liquid outlet 220, and the other end of the second liquid guiding branch pipe is connected to the third liquid inlet 410. The second liquid outlet 220 and the third liquid inlet 410 are connected to the liquid guiding port 312 through the liquid guiding main pipe, the first liquid guiding branch pipe, and the second liquid guiding branch pipe. The implementation cost is low and the connection effect is reliable.

[0047] Please refer to FIG. 2 . In one embodiment, the housing 310 is provided with an air filling port 313 , which is in communication with the hydraulic chamber 311 . The air bag 320 is provided with an air inlet 321 , which is in communication with the air filling port 313 .

[0048] With such arrangement, the gas medium can be delivered to the air inlet 321 of the airbag 320 through the inflation port 313 on the shell 310 to fill the gas medium into the airbag 320 , which has low implementation cost and is easy to use.

[0049] In addition, after the airbag 320 is used for a long time, the gas medium inside it may leak. In this embodiment, the gas medium can be replenished into the airbag 320 through the inflation port 313 on the shell 310, which is convenient to operate. In other embodiments, part of the gas medium in the airbag 320 can also be released through the inflation port 313, which will not be repeated here.

[0050] Please refer to FIG. X. In one embodiment, the energy storage device 300 further includes a liquid conducting valve 330. The liquid conducting valve 330 is disposed at the liquid conducting port 312 and is used to open or close the liquid conducting port 312.

[0051] When the liquid medium enters the hydraulic chamber 311 through the liquid guide port 312, the liquid guide port 312 can be closed by the liquid guide valve 330 to achieve energy accumulation. When the accumulated energy needs to be released, the liquid guide port 312 is opened by the liquid guide valve 330. At this time, the liquid medium in the hydraulic chamber 311 enters the power generation device 400 through the liquid guide port 312 to generate electricity. The implementation cost is low and the control process is reliable.

[0052] Please refer to Figure 2. In one embodiment, the liquid guiding valve 330 includes a valve housing 331, a liquid blocking portion 332, a guide rod 333 and a mounting platform 334. The valve housing 331 is arranged at the liquid guiding port 312 and has a liquid guiding channel. One end of the liquid guiding channel is connected to the hydraulic chamber 311, and the other end of the liquid guiding channel is connected to the second liquid outlet 220 and the third liquid inlet 410. The liquid blocking portion 332 is arranged at one end of the guide rod 333. The shape of the liquid blocking portion 332 matches the cross-sectional shape of the liquid guiding channel. The mounting platform 334 is arranged in the liquid guiding channel and has a mounting hole. The guide rod 333 passes through the mounting hole and can reciprocate along the axial direction of the mounting hole so that the liquid blocking portion 332 opens or closes the liquid guiding channel.

[0053] The liquid medium can enter and exit the hydraulic chamber 311 through the liquid guide channel of the valve housing 331. The guide rod 333 passing through the mounting hole of the mounting platform 334 can drive the liquid blocking part 332 to move so that the liquid blocking part 332 can open or close the liquid guide channel. The implementation cost is low and the opening and closing effect of the liquid guide port 312 is reliable.

[0054] Furthermore, the liquid blocking portion 332 may be located inside the hydraulic chamber 311 or outside the hydraulic chamber 311 , as long as the liquid guiding channel can be opened and closed, and no specific limitation is made here; in the embodiment shown in FIG. 2 , the liquid blocking portion 332 is located inside the hydraulic chamber 311 .

[0055] For example, when the liquid blocking portion 332 is disc-shaped, the cross-sectional shape of the liquid guiding channel is circular; when the liquid blocking portion 332 is a flat polygonal prism, the cross-sectional shape of the liquid guiding channel is a polygon with the same number of prisms as the polygonal prism, which will not be described in detail here.

[0056] Furthermore, the mounting platform 334 is also provided with a plurality of liquid guiding holes, through which the liquid medium can flow in the liquid guiding channel, so that the liquid medium can enter and exit the hydraulic cavity 311 .

[0057] In one embodiment, the liquid guiding valve 330 further includes an elastic member (not shown in the figure), which is sleeved outside the guide rod 333 , one end of the elastic member abuts against the liquid blocking portion 332 , and the other end of the elastic member abuts against the mounting platform 334 .

[0058] The elastic member is in contact with the mounting platform 334 and the liquid blocking portion 332. Under the action of the elastic member, the liquid blocking portion 332 is away from the end of the hydraulic chamber 311 of the liquid guiding channel, so that the liquid medium can flow normally in the liquid guiding channel and enter and exit the hydraulic chamber 311. When there is too much liquid medium in the hydraulic chamber 311, resulting in excessive internal pressure of the hydraulic chamber 311, the liquid blocking portion 332 moves toward the end of the liquid guiding channel in the hydraulic chamber 311. At this time, the elastic member is compressed, and the liquid blocking portion 332 prevents the liquid medium from entering and exiting the liquid guiding channel to achieve energy accumulation. With this arrangement, when enough energy is accumulated in the hydraulic chamber 311, the liquid blocking portion 332 will automatically close the liquid guiding channel, which is simple to implement and improves the convenience of operation.

[0059] In one embodiment, the elastic member includes a spring, which is sleeved outside the guide rod 333 and abuts between the liquid blocking portion 332 and the mounting platform 334 .

[0060] Please refer to FIG. 2 . In one embodiment, the energy storage device 300 further includes a sealing ring 340 . The inner ring of the sealing ring 340 is sleeved on the outside of the liquid guiding valve 330 . The outer ring of the sealing ring 340 abuts against the inner wall of the hydraulic chamber 311 .

[0061] The sealing ring 340 can prevent the liquid medium or gas medium in the hydraulic chamber 311 from flowing out from the installation gap between the liquid guide valve 330 and the housing 310, thereby ensuring the sealing performance of the housing 310 and further improving the reliability of the energy storage system.

[0062] Furthermore, the outer ring shape of the sealing ring 340 matches the inner wall shape of the hydraulic chamber 311. For example, in the embodiment shown in Figure 2, the shape of the hydraulic chamber 311 near the liquid guide valve 330 is an inclined surface, and the outer ring of the sealing ring 340 is also tilted to match the inner wall shape of the hydraulic chamber 311 near the liquid guide valve 330.

[0063] Please refer to FIG. 2 . In one embodiment, the energy storage device 300 further includes a charging valve 350 . The charging valve 350 is disposed at the air inlet 321 and penetrates the air inlet 313 . The charging valve 350 is used to open or close the air inlet 321 .

[0064] The inflation valve 350 can open or close the air inlet 321, so that the staff can fill the airbag 320 with gas medium through the inflation valve 350 penetrated through the inflation port 313. After the gas medium is filled, the inflation valve 350 is closed. The operation is convenient and the implementation cost is low.

[0065] Please refer to FIG. 2 . In one embodiment, the energy storage device 300 further includes a protective cover 360 . The protective cover 360 is disposed at the inflation port 313 and sleeved outside the inflation valve 350 .

[0066] The protective cover 360 disposed outside the inflation valve 350 can provide a certain degree of protection for the inflation valve 350 to prevent the inflation valve 350 from being damaged by collision and causing the airbag 320 to leak.

[0067] In one embodiment, the protective cover 360 is detachably provided at the inflation port 313. When it is necessary to open the inflation valve 350 and fill the airbag 320 with gas medium, the protective cover 360 is detached from the inflation port 313 to expose the inflation valve 350 and fill it with gas; after inflation is completed, the protective cover 360 is installed back to the inflation port 313 to prevent the inflation valve 350 from being bumped.

[0068] In one embodiment, the protective cover 360 is a cylindrical structure and is mounted on the outside of the inflation valve 350. A cover opening is provided at one end of the protective cover 360, and a worker can fill the inflation valve 350 with gas medium through the cover opening. With this arrangement, the inflation valve 350 can be filled with gas medium without removing the protective cover 360, which is easy to operate.

[0069] In one embodiment, the energy storage system further includes a heat dissipation device (not shown in the figure), which is used to dissipate the heat generated by the energy storage device 300 .

[0070] When the gas medium is compressed, compression heat is generated, which affects the volume of the gas medium, causing the volume of the gas medium to increase, and in severe cases even causing the shell 310 to be damaged due to excessive pressure. The heat dissipation device can dissipate the compression heat generated by the gas medium, prevent the gas medium from increasing in volume due to overheating, and improve the reliability of the energy storage device 300.

[0071] Furthermore, the heat dissipation form of the heat dissipation device for the energy storage device 300 may be air cooling, for example, the heat dissipation device includes a cooling fan, and the cooling fan is arranged toward the energy storage device 300; in other embodiments, the heat dissipation form of the heat dissipation device for the energy storage device 300 may also be water cooling, for example, the heat dissipation device is provided with a water cooling chamber, and the water cooling chamber has a cooling medium, the energy storage device 300 is arranged in the water cooling chamber, and the heat emitted by the energy storage device 300 is taken away by the flow of the cooling medium.

[0072] In one embodiment, the energy storage system further includes a data acquisition device, through which the leakage rate of the energy storage device 300 is detected. The data acquisition device includes a pressure sensor, a flow sensor, a temperature sensor and a computing module; in the process of the hydraulic pump 200 delivering the liquid medium to the hydraulic chamber 311, the pressure sensor will monitor the pressure change in the hydraulic chamber 311. When there is a leakage in the hydraulic chamber 311, the pressure will drop, and the pressure sensor will detect the pressure drop; the flow sensor can monitor the flow rate of the liquid medium input into the hydraulic chamber 311 within a specific pressure range, and the flow rate is associated with the change in the gas volume in the hydraulic chamber 311; the temperature sensor is used to monitor the temperature of the energy storage device 300, and the computing module can detect the pressure drop according to the temperature. The calculation module uses Boyle's law (ideal gas state equation) to calculate the current volume of the gas medium in the hydraulic chamber 311 under different pressures, and compares the current volume of the gas medium and the flow rate of the liquid medium added to the hydraulic chamber 311 when the pressure changes between the set upper limit and the lower limit, thereby calculating the leakage rate of the energy storage device 300. When the leakage rate exceeds the set limit value, an alarm signal is issued. In this way, the energy storage system can effectively monitor and discover the leakage problem of the energy storage device 300, thereby ensuring the stable operation of the energy storage system.

[0073] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0074] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. An energy storage system, characterized in that: include: A liquid storage device, the liquid storage device is used to store a liquid medium and has a first liquid inlet and a first liquid outlet that are connected; A hydraulic pump, the hydraulic pump is used to be electrically connected to a power source and has a second liquid inlet and a second liquid outlet that are connected to each other, wherein the second liquid inlet is connected to the first liquid outlet; An energy storage device, wherein the energy storage device has a hydraulic chamber, and the hydraulic chamber is connected to the second liquid outlet; as well as A power generation device, wherein the power generation device has a third liquid inlet and a third liquid outlet, wherein the third liquid inlet is communicated with the hydraulic chamber, and the third liquid outlet is communicated with the first liquid inlet.

2. The energy storage system according to claim 1, characterized in that: The energy storage device includes a shell and an airbag, the shell is provided with the hydraulic cavity and the liquid guide port which are connected, the airbag is arranged in the hydraulic cavity and is used to store the gas medium, and the second liquid outlet and the third liquid inlet are both connected with the liquid guide port.

3. The energy storage system according to claim 2, characterized in that: The shell is provided with an air filling port, which is communicated with the hydraulic chamber; the air bag is provided with an air inlet, which is communicated with the air filling port.

4. The energy storage system according to claim 2, characterized in that: The energy storage device further comprises a liquid guiding valve, which is arranged at the liquid guiding port and is used to open or close the liquid guiding port.

5. The energy storage system according to claim 4, characterized in that: The liquid guiding valve includes a valve housing, a liquid blocking portion, a guide rod and a mounting platform. The valve housing is arranged at the liquid guiding port and has a liquid guiding channel. One end of the liquid guiding channel is communicated with the hydraulic chamber, and the other end of the liquid guiding channel is communicated with the second liquid outlet and the third liquid inlet. The liquid blocking portion is arranged at one end of the guide rod, and the shape of the liquid blocking portion matches the cross-sectional shape of the liquid guiding channel. The mounting platform is arranged in the liquid guiding channel and has a mounting hole. The guide rod passes through the mounting hole and can reciprocate along the axial direction of the mounting hole so that the liquid blocking portion opens or closes the liquid guiding channel.

6. The energy storage system according to claim 5, characterized in that: The liquid guiding valve further comprises an elastic member, which is sleeved outside the guide rod, one end of the elastic member abuts against the liquid blocking portion, and the other end of the elastic member abuts against the mounting platform.

7. The energy storage system according to claim 4, characterized in that: The energy storage device further comprises a sealing ring, the inner ring of which is sleeved on the outside of the liquid guiding valve, and the outer ring of which is in contact with the inner wall of the hydraulic chamber.

8. The energy storage system according to claim 3, characterized in that: The energy storage device further comprises an air charging valve, which is arranged at the air inlet and penetrates the air charging port, and is used to open or close the air inlet.

9. The energy storage system according to claim 8, characterized in that: The energy storage device also includes a protective cover, which is arranged at the inflation port and sleeved outside the inflation valve.

10. The energy storage system according to claim 1, characterized in that: The energy storage system also includes a heat dissipation device, which is used to dissipate heat generated by the energy storage device.

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