Energy storage device

Abstract

The invention discloses an energy storage device which comprises an absorber / generator, an evaporator / condenser, a first heat exchange module, a connecting pipeline, a second heat exchange module, a first circulating pipe and a second circulating pipe. The top end of the absorber / generator can be communicated with the top end of the evaporator / condenser through a connecting pipeline; the first end of the first circulating pipe is connected to the bottom end of the absorber / generator, the second end of the first circulating pipe is connected to the top end of the absorber / generator and extends into the top end of the absorber / generator, and the second end of the first circulating pipe is provided with a first spraying structure; the first heat exchange module comprises a crystallizing pond arranged in the absorber / generator, and the first spraying structure is located above the crystallizing pond; the heat exchange part of the second heat exchange module is arranged in the evaporator / condenser, the first end of the second circulating pipe is connected to the bottom end of the evaporator / condenser, the second end of the second circulating pipe extends into the top end of the evaporator / condenser and is provided with a second spraying structure, and the second spraying structure is located above the heat exchange part of the second heat exchange module.

Description

Technical Field

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

[0002] The global energy mix is ​​currently undergoing profound transformation, with renewable energy becoming the driving force behind growth. The utilization of renewable energy is a crucial tool for advancing global climate governance. However, most renewable energy sources (such as waste heat) exhibit instability and intermittency, which vary over time and space. This leads to a mismatch between supply and demand in terms of time, space, and energy. To address this issue, energy storage technology has emerged. Energy storage, implemented through energy storage devices, is a key technology for achieving energy transition and other goals.

[0003] Solution energy storage technology is a relatively common energy storage technology, and solution energy storage technology generally utilizes the concentration difference of the solution to store energy. The dilute solution changes the solvent of the solution from liquid to solvent vapor (the solvent can be water) through the occurrence of heat, thereby increasing the concentration of the solution, and finally storing the heat energy in the concentrated solution through the phase change of the solvent (such as water) to achieve energy storage. On the basis of the solution becoming concentrated, the solution concentration difference can be further increased by further crystallization of the solution (that is, the solute of the solution crystallizes), thereby achieving the purpose of increasing the amount of stored energy. In the process of releasing energy, the concentrated solution (or the concentrated solution containing crystals) absorbs the solvent vapor and the temperature increases and the concentration decreases, and finally the energy is released. It should be noted that the above-mentioned mechanism of storing and releasing energy is well known and will not be described in detail.

[0004] As a type of thermal absorption energy storage, solution energy storage technology has high energy storage density (up to 150-500KWh / m 3 ), long energy storage time (suitable for storage for several days or even months), long cycle life, environmental protection, and high safety. However, the solution energy storage technology involved in the related art still has some shortcomings. For example, it is easy to cause pipes, pumps and other components to be blocked during the solution crystallization process, thereby affecting the flow of the solution. In order to avoid blockage, the related art uses a filter cartridge to prevent the energy storage device from being blocked, but this will cause the structure of the energy storage device to be more complicated, and an additional heating rod is required to assist in the process of crystal dissolution, which not only increases the energy consumption of the system, but also leads to low operating efficiency of the energy storage device. Summary of the Invention

[0005] An embodiment of the present invention discloses an energy storage device to solve the problems of complex structure, high energy consumption and low operating efficiency of the energy storage device described in the background art.

[0006] In order to solve the above technical problems, this application provides the following technical solutions:

[0007] In a first aspect, an embodiment of the present invention discloses an energy storage device, which includes an absorber / generator, an evaporator / condenser, a first heat exchange module, a connecting pipeline, a second heat exchange module, a first circulation pipe, and a second circulation pipe;

[0008] The top of the absorber / generator can be connected to the top of the evaporator / condenser through the connecting pipeline; the first end of the first circulation pipe is connected to the bottom end of the absorber / generator, the second end of the first circulation pipe is connected to the top of the absorber / generator and extends into the interior of the top of the absorber / generator, and the second end of the first circulation pipe is provided with a first spray structure; the first heat exchange module includes a crystallization pool provided in the absorber / generator, and the first spray structure is located above the crystallization pool;

[0009] The heat exchange part of the second heat exchange module is arranged in the evaporator / condenser, the first end of the second circulation pipe is connected to the bottom end of the evaporator / condenser, the second end of the second circulation pipe extends to the interior of the top of the evaporator / condenser and is provided with a second spray structure, and the second spray structure is located above the heat exchange part of the second heat exchange module; the absorber / generator is used to accommodate a solution with a solvent as the solvent and a solute capable of crystallizing, and the evaporator / condenser is used to accommodate the solvent.

[0010] Optionally, the first heat exchange module includes a plurality of crystallization pools and a first heat exchange medium pipe, the plurality of crystallization pools are distributed in sequence in the vertical direction so that the crystallization pool located below two adjacent crystallization pools receives the solution flowing down from the crystallization pool above, and the first heat exchange medium pipe is connected to the plurality of crystallization pools.

[0011] Optionally, the energy storage device also includes a third heat exchange module and a third circulation pipe, the heat exchange part of the third heat exchange module is arranged inside the absorber / generator, the first end of the third circulation pipe is connected to the bottom end of the absorber / generator, and the second end of the third circulation pipe extends to the interior of the top end of the absorber / generator and is provided with a third spray structure, and the third spray structure is located above the heat exchange part of the third heat exchange module.

[0012] Optionally, a first pump body is provided on the first circulation pipe, and the first pump body is used to drive the solution to flow from the first end of the first circulation pipe to the second end of the first circulation pipe; a second pump body is provided on the third circulation pipe, and the second pump body is used to drive the solution to flow from the first end of the third circulation pipe to the second end of the third circulation pipe.

[0013] Optionally, the energy storage device also includes a first common pipe, which is provided with a first valve, and the first valve is used to control the opening and closing of the first common pipe. The first end of the first common pipe is connected to the bottom end of the absorber / generator, and the first end of the first circulation pipe and the first end of the third circulation pipe are connected in parallel to the second end of the first common pipe.

[0014] Optionally, the energy storage device also includes a third heat exchange module, the heat exchange part of the third heat exchange module is arranged in the absorber / generator, and the heat exchange part of the third heat exchange module is located between the first spray structure and the heat exchange part of the first heat exchange module, so that the crystallization pool of the first heat exchange module receives the solution passing through the heat exchange part of the third heat exchange module.

[0015] Optionally, the heat exchange portion of the first heat exchange module and the heat exchange portion of the third heat exchange module are curved pipes extending in a curved manner within the absorber / generator.

[0016] Optionally, the connecting pipeline includes a first branch and a second branch; the first branch is connected in parallel with the second branch, and both ends of the first branch and the second branch are respectively connected to the top of the absorber / generator and the top of the evaporator / condenser; the first branch is provided with a second valve for controlling its on and off, the second branch is provided with a third valve for controlling its on and off, and the second branch is provided with a transformer, which is used to adjust the pressure on both sides thereof.

[0017] Optionally, the connecting pipeline also includes a second common pipe and a third common pipe, the first end of the second common pipe is connected to the top of the absorber / generator, and the first end of the first branch pipe and the first end of the second branch pipe are connected in parallel to the second end of the second common pipe; the first end of the third common pipe is connected to the top of the evaporator / condenser, and the second end of the first branch pipe and the second end of the second branch pipe are connected in parallel to the second end of the third common pipe.

[0018] Optionally, the energy storage device also includes a negative pressure suction structure, which includes a negative pressure suction pipe, a negative pressure pump and a fourth valve. The first end of the negative pressure suction pipe is connected to the third common pipe, and the fourth valve is arranged on the negative pressure suction pipe and is used to control the opening and closing of the negative pressure suction pipe. The negative pressure pump is arranged on the negative pressure suction pipe and is located on the side of the fourth valve adjacent to the second end of the negative pressure suction pipe.

[0019] The energy storage device disclosed in the embodiments of the present invention has the following technical effects:

[0020] The energy storage device disclosed in the embodiment of the present invention designs the structure of the first heat exchange module so that the first heat exchange module includes a crystallization pool provided in the absorber / generator, thereby enabling crystallization to occur in the crystallization pool during the energy storage process. In other words, the concentrated solution circulates through the crystallization pool and exchanges heat with the first heat exchange module to crystallize in the crystallization pool. The formed crystals will be stored in the crystallization pool and will not easily flow back into the absorber / generator. It is also not easy for the crystallization in the absorber / generator to clog the pipeline, pump and other components, thereby not easily affecting the flow of the solution. This structure eliminates the need for a filter cartridge to prevent clogging in the energy storage device, thereby simplifying the structure of the energy storage device. At the same time, since there is no need for a filter cartridge, there is no need to add a heating rod outside the filter, which can ultimately reduce the energy consumption of the energy storage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a structural schematic diagram of an energy storage device disclosed in an embodiment of the present invention;

[0022] Figure 2 yes Figure 1 The schematic diagram of the energy storage device shown is in the voltage regulation working mode;

[0023] Figure 3 yes Figure 1 The schematic diagram of the energy storage device shown is in a non-voltage regulation working mode;

[0024] Figure 4 is a structural schematic diagram of another energy storage device disclosed in an embodiment of the present invention;

[0025] Figure 5 yes Figure 4 The schematic diagram of the energy storage device shown is in the voltage regulation working mode;

[0026] Figure 6 yes Figure 4 The schematic diagram of the energy storage device shown is in a non-voltage regulation working mode;

[0027] Figure 7 It is a schematic diagram of a partial structure of the first heat exchange module disclosed in an embodiment of the present invention.

[0028] Description of reference numerals:

[0029] 10-Absorber / Generator, 20-Evaporator / Condenser,

[0030] 30-first heat exchange module, 31-first heat exchange medium pipe, 32-crystallization pool, 311-trough structure, 312-honeycomb isolation sheet,

[0031] 40-connecting pipeline, 41-first branch pipe, 411-second valve, 42-second branch pipe, 421-third valve, 422-transformer, 43-second common pipe, 44-third common pipe,

[0032] 50-second heat exchange module,

[0033] 60-first circulation pipe, 61-first spray structure, 62-first pump body,

[0034] 70-second circulation pipe, 71-second spray structure, 72-third pump body, 73-sixth valve,

[0035] 80-solution, 81-solvent,

[0036] 91-third heat exchange module, 911-heat exchange part, 92-third circulation pipe, 921-third spray structure, 922-second pump body, 93-first common pipe, 931-first valve, 94-negative pressure suction structure, 941-negative pressure suction pipeline, 942-fourth valve, 943-negative pressure pump, 95-solution replenishing structure, 951-solution replenishing pipeline, 952-fifth valve. DETAILED DESCRIPTION

[0037] To make the objectives, technical solutions, and advantages of this application more clear, the technical solutions of this application will be clearly and completely described below in conjunction with the specific embodiments of this application and the corresponding drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0038] The technical solutions disclosed in various embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0039] The present invention discloses an energy storage device. The operating principle of the energy storage device disclosed in the present invention is the same as that of the solution energy storage technology described in the background art. Energy is stored by concentrating or even crystallizing the solution, and energy is released by diluting the solution or even dissolving crystals in the solution.

[0040] Please refer to Figures 1 to 7 The energy storage device disclosed in the embodiment of the present invention includes an absorber / generator 10, an evaporator / condenser 20, a first heat exchange module 30, a connecting pipeline 40, a second heat exchange module 50, a first circulation pipe 60 and a second circulation pipe 70.

[0041] The absorber / generator 10 is used to hold a preset amount of solution. At the same time, the absorber / generator 10 is not only a container for the evaporation and crystallization of the liquid solvent in the solution, but also a container for the condensation of the gaseous solvent (i.e., solvent vapor) and the mixing of the concentrated solution and the dissolution of the crystals. In an embodiment of the present invention, the solution 80 is a solution with the solvent 81 as the solvent and the solute capable of crystallization. The solution can be a lithium bromide aqueous solution, a calcium chloride aqueous solution, or a lithium chloride aqueous solution. Correspondingly, the solute can be lithium bromide, calcium chloride, lithium chloride, etc., and the solvent (i.e., the solvent) can be water. It should be noted that the embodiment of the present invention does not limit the specific type of solution. As long as the solution becomes concentrated by evaporation of the solvent and realizes solute crystallization to realize energy storage, and becomes thinner by adding a solvent and realizes the dissolution of crystals, it can be used in the energy storage device disclosed in the embodiment of the present invention.

[0042] The evaporator / condenser 20 is used to contain the solvent 81, which is also the solvent of the solution. Furthermore, the evaporator / condenser 20 is not only a container for the gaseous solvent generated by the heating of the solution during the energy storage process, which is discharged from the absorber / generator 10 and condensed for storage, but also a place where the liquid solvent is heated and converted into solvent vapor during the energy release process.

[0043] During the energy storage process, the solution in the absorber / generator 10 is heated, and the liquid solvent in the solution becomes a gaseous solvent and is discharged into the evaporator / condenser 20. At the same time, the solution in the absorber / generator 10 becomes concentrated and crystallized. During the energy release process, the liquid solvent in the evaporator / condenser 20 is heated and becomes a gaseous solvent and is discharged into the absorber / generator 10 and mixed with the concentrated solution that has become concentrated and crystallized in the absorber / generator 10, thereby making the solution dilute. The function of the connecting pipe 40 is to connect the absorber / generator 10 and the evaporator / condenser 20. Specifically, in an embodiment of the present invention, the top of the absorber / generator 10 can be connected to the top of the evaporator / condenser 20 through the connecting pipe 40. The gaseous solvent will rise to the top of the absorber / generator 10 and enter the top of the evaporator / condenser 20 through the connecting pipe 40, and then enter the evaporator / condenser 20 from the top of the evaporator / condenser 20, or the gaseous solvent will rise to the top of the evaporator / condenser 20 and enter the top of the absorber / generator 10 through the connecting pipe 40, and then enter the absorber / generator 10 from the top of the absorber / generator 10.

[0044] The first end of the first circulation pipe 60 is connected to the bottom end of the absorber / generator 10, and the second end of the first circulation pipe 60 is connected to the top end of the absorber / generator 20 and extends to the inside of the top end of the absorber / generator 10. The solution in the absorber / generator 10 can circulate through the first circulation pipe 60, thereby gradually becoming concentrated during the energy storage process or gradually becoming dilute during the energy release process. A first spray structure 61 is provided at the second end of the first circulation pipe 60. The first spray structure 61 enables the circulating solution to be sprayed in a larger space, so that the solution and the first heat exchange module 30 described later can be more fully exchanged with each other to achieve the purpose of better evaporation of the solvent or the solution and the crystals in the crystallization pool 32 described later can be more fully mixed to achieve the purpose of dissolving the crystals.

[0045] The first heat exchange module 30 is used to exchange heat with the flowing solution during the energy storage process, thereby gradually concentrating the solution and causing it to crystallize. During the energy release process, the crystals crystallized thereon mix with the flowing solution, thereby gradually diluting the solution and dissolving the crystals. In an embodiment of the present invention, the first heat exchange module 30 includes a crystallization pool 32, which is located within the absorber / generator 10. During the energy storage process, as the solution circulates and exchanges heat with the first heat exchange module 30, the solution becomes increasingly concentrated. Crystallization then occurs after it falls into the crystallization pool 32, while the liquid solution continues to overflow and flow out of the crystallization pool 32. During this process, the crystals remain in the crystallization pool 32 and rarely, if ever, return to the bottom of the absorber / generator 10 with the solution. The heat exchange portion of the first heat exchange module 30 is connected to the crystallization pool 32 and is also located within the absorber / generator 10. Of course, the liquid inlet and outlet pipes of the first heat exchange module 30 are located outside the absorber / generator 10.

[0046] The second heat exchange module 50 is used to exchange heat with the solvent vapor entering the evaporator / condenser 20 during the energy storage process to convert it into liquid solvent. During the energy release process, it is used to exchange heat with the liquid solvent circulating in the evaporator / condenser 20 to convert it into solvent vapor. In this embodiment of the present invention, the heat exchange portion of the second heat exchange module 50 is located within the evaporator / condenser 20. The liquid inlet and outlet pipes of the second heat exchange module 50 are respectively connected to the heat exchange portion of the second heat exchange module 50 and are both located outside the evaporator / condenser 20.

[0047] The first end of the second circulation pipe 70 is connected to the bottom end of the evaporator / condenser 20, and the second end of the second circulation pipe 70 extends to the interior of the top end of the evaporator / condenser 20. A second spray structure 71 is provided at the second end of the second circulation pipe 70. The second spray structure 71 is located above the heat exchange portion of the second heat exchange module 50. The liquid solvent in the evaporator / condenser 20 can circulate through the second circulation pipe 70, so that during the energy storage process, the solvent vapor entering the evaporator / condenser 20 exchanges heat with the heat exchange portion of the second heat exchange module 50 and condenses to become liquid solvent. Alternatively, during the energy release process, the liquid solvent is sprayed by the second spray structure 71 onto the heat exchange portion of the second heat exchange module 50, thereby exchanging heat and becoming solvent vapor, thereby preparing for subsequent input into the absorber / generator 10.

[0048] The working process of the energy storage device disclosed in the embodiment of the present invention is as follows:

[0049] During the energy storage process, a high-temperature medium (such as high-temperature wastewater) is introduced into the first heat exchange module 30, and the solution in the absorber / generator 10 begins to circulate through the first circulation pipe 60. At the same time, the first spray structure 61 will spray the solution onto the first heat exchange module 30. The solution is heated by heat exchange with the first heat exchange module 30, so that the liquid solvent in the solution is converted into solvent vapor and separated from the solution. As the solution circulation continues, the solution becomes more and more concentrated and then crystallizes in the crystallization pool 32 while flowing through the first heat exchange module 30. The part of the solution that has not crystallized will overflow from the crystallization pool 32 and continue to circulate until the energy storage is completed, that is, the concentration of the solution or the crystallization reaches the preset requirements. At the same time, during this energy storage process, the solvent vapor will enter the evaporator / condenser 20 through the connecting pipe 40, and a medium with a lower temperature (such as low-temperature wastewater) will be introduced into the second heat exchange module 50 to exchange heat with the solvent vapor, thereby realizing the condensation of the solvent vapor in the evaporator / condenser 20, and finally forming a liquid solvent and storing it at the bottom end of the evaporator / condenser 20. The condensation of the solvent vapor will reduce the pressure in the evaporator / condenser 20, so that the solvent vapor generated in the absorber / generator 10 will continuously enter the evaporator / condenser 20 through the connecting pipe 40 and continue to condense into a liquid solvent until the energy storage is completed.

[0050] During the energy release process, a medium with a higher temperature (such as high-temperature wastewater) is introduced into the second heat exchange module 50, and the liquid solvent in the evaporator / condenser 20 circulates through the second circulation pipe 70. At the same time, the second spray structure 71 sprays the liquid solvent onto the second heat exchange module 50. The liquid solvent is heated through heat exchange with the second heat exchange module 50, so that the liquid solvent will be converted into more solvent vapor. As the liquid solvent circulation continues, the solvent vapor generated in the evaporator / condenser 20 will continue to enter the absorber / generator 10 through the connecting pipeline 40. At the same time, the solvent vapor entering the absorber / generator 10 will undergo heat exchange with the lower temperature medium (such as low-temperature wastewater) introduced into the second heat exchange module 50, thereby being condensed and turned into a liquid solvent. The liquid solvent will dissolve the crystals in the crystallization pool 32 while flowing through the crystallization pool 32. At the same time, the liquid solvent overflows the crystallization pool 32 and falls into the concentrated solution at the bottom of the absorber / generator 10, thereby diluting the solution and forming a dilute solution. This circulation process of diluting the solution continues until the energy release is completed.

[0051] Through the above working process, it can be known that the energy storage device disclosed in the embodiment of the present invention designs the structure of the first heat exchange module 30 so that the first heat exchange module 30 includes a crystallization pool 32 provided in the absorber / generator 10, so that during the energy storage process, crystals can be formed in the crystallization pool 32. In other words, the concentrated solution circulates through the crystallization pool 32 and exchanges heat with the first heat exchange module 30 to crystallize in the crystallization pool 32. The formed crystals will be stored in the crystallization pool 32 and will not easily flow back into the absorber / generator 10. It is also not easy to block pipes, pumps and other components due to crystallization in the absorber / generator 10, and it is not easy to affect the flow of the solution. This structure can make the energy storage device do not need to be equipped with a filter cartridge to prevent clogging, thereby simplifying the structure of the energy storage device. At the same time, since there is no need for a filter cartridge, there is no need to add a heating rod outside the filter, which can ultimately reduce the energy consumption of the energy storage device.

[0052] In an embodiment of the present invention, the first heat exchange module 30 may include one crystallization pool 32 or multiple crystallization pools 32. The embodiment of the present invention does not limit the number of crystallization pools 32 included in the first heat exchange module 30. Taking into account the crystallization efficiency during the energy storage process and the crystal dissolution efficiency during the energy release process, in one embodiment, the first heat exchange module 30 may include multiple crystallization pools 32. Among them, the multiple crystallization pools 32 are distributed in sequence in the vertical direction so that the crystallization pool 32 located below in two adjacent crystallization pools 32 receives the solution flowing down from the crystallization pool 32 above. The first heat exchange module 30 may also include a first heat exchange medium pipe 31, which is connected to the multiple crystallization pools 32. During the energy storage process, a high-temperature medium is introduced into the first heat exchange medium pipe 31, so that the first heat exchange medium pipe 31 and the crystallization pool 32 connected thereto both have a higher temperature, thereby heating the solution 80 flowing through so that the solvent 81 evaporates. During the energy release process, a low-temperature medium is introduced into the first heat exchange medium pipe 31, so that the first heat exchange medium pipe 31 and the crystallization pool 32 connected thereto have a lower temperature, thereby cooling the solvent vapor flowing into the absorber / generator 10 so that it condenses and becomes a liquid solvent. The condensed liquid solvent will eventually fall into the bottom of the absorber / generator 10, thereby diluting the concentrated solution into a dilute solution. The dilute solution is then sprayed into the crystallization pool 32 through the first circulation pipe 60 and the first spray structure 61 to achieve the dissolution of the crystals. The heat exchange portion of the first heat exchange module 30 is a portion of the first heat exchange medium pipe 31, and the liquid inlet pipe and liquid outlet pipe of the first heat exchange module 30 are the liquid inlet pipe and liquid outlet pipe of the first heat exchange medium pipe 31. The liquid inlet pipe and liquid outlet pipe of the first heat exchange medium pipe 31 are respectively connected to the heat exchange portion of the first heat exchange module 30.

[0053] In an embodiment of the present invention, in an embodiment in which there are multiple crystallization pools 32, the first heat exchange medium pipe 31 can be one, and the connection with each crystallization pool 32 is achieved by bending in a direction to adapt to the positions of multiple crystallization pools 32. In other embodiments, there can be multiple first heat exchange medium pipes 31, and multiple first heat exchange medium pipes 31 can be connected to multiple crystallization pools 32 in a one-to-one correspondence, so that one first heat exchange medium pipe 31 can be configured for each crystallization pool 32. The medium in each first heat exchange medium pipe 31 of this structure is specifically responsible for heating or cooling the corresponding crystallization pool 32, so that the concentrated solution in the crystallization pool 32 can be more effectively heated to crystallize it or the temperature of the crystallization pool 32 can be more effectively lowered so that the solvent vapor around the crystallization pool 32 can be more efficiently condensed and liquefied. It should be explained that the embodiment of the present invention does not limit the specific number of crystallization pools 32 and first heat exchange medium pipes 31.

[0054] The crystallization pool 32 can have various structures. In the embodiment of the present invention, the crystallization pool 32 is a container with a top opening, so that after receiving the solution 80, the solution can overflow from the top opening and crystals can be crystallized at the bottom of the container. Figure 7 Specifically, the crystallization pool 32 may only include the trough structure 311. Please refer again Figure 7 In one embodiment, the crystallization pool 32 may include a trough structure 311 and a honeycomb isolation sheet 312 arranged in the trough structure 311. The honeycomb isolation sheet 312 can divide the space in the trough of the trough structure 311 into multiple subspaces, thereby forming multiple smaller crystallization spaces, which is conducive to the attachment of crystals and ultimately makes the formed crystals less likely to fall off.

[0055] The energy storage device disclosed in the embodiment of the present invention may further include a third heat exchange module 91 and a third circulation pipe 92. The heat exchange portion 911 of the third heat exchange module 91 is disposed within the absorber / generator 10, and the liquid inlet pipe and the liquid outlet pipe of the third heat exchange module 91 are respectively connected to the heat exchange portion 911 and are both located outside the absorber / generator 10. The first end of the third circulation pipe 92 is connected to the bottom end of the absorber / generator 10. The second end of the third circulation pipe 92 extends to the interior of the top end of the absorber / generator 10. The second end of the third circulation pipe 92 is provided with a third spray structure 921, which is located above the heat exchange portion of the third heat exchange module 91.

[0056] As described above, during the energy storage process, the solution in the absorber / generator 10 circulates through the first circulation pipe 60 and is sprayed onto the first heat exchange module 30 through the first spray structure 61, thereby achieving solvent evaporation. In the case where the energy storage device includes a third heat exchange module 91 and a third circulation pipe 92, during the energy storage process, the solution in the absorber / generator 10 will also circulate through the third circulation pipe 92 and be sprayed onto the heat exchange portion 911 of the third heat exchange module 91 through the third spray structure 921, and exchange heat with the high-temperature medium introduced into the third heat exchange module 91, thereby enabling the solvent in the solution to be evaporated into solvent vapor. It can be seen that during the energy storage process, both the third heat exchange module 91 and the first heat exchange module 30 can perform heat exchange with the solution 80 to convert the liquid solvent into solvent vapor, thereby enabling the solution to become more concentrated more efficiently, which can improve the storage efficiency during the energy storage process.

[0057] During the energy storage process, the solution gradually becomes more concentrated. As the solution becomes more concentrated, the solute in the solution will crystallize. To prevent crystals from crystallizing on the third heat exchange module 91, the third heat exchange module 91 and the third circulation pipe 92 disclosed in the embodiment of the present invention can cooperate with the first heat exchange module 30 and the first circulation pipe 60 in the early stage of energy storage to accelerate the solvent evaporation efficiency, thereby achieving the solution's concentration efficiency before crystallization. When the concentration of the solution reaches or is about to reach the critical crystallization concentration range, the operation of the third heat exchange module 91 and the third circulation pipe 92 can be suspended, while the first heat exchange module 30 and the first circulation pipe 60 continue to operate until the energy storage operation is completed. It should be noted that in this document, the critical crystallization concentration range varies depending on the type of solution. The embodiment of the present invention does not limit the specific value of the critical crystallization concentration range. Those skilled in the art can determine the critical crystallization concentration range based on the type of solution. At the same time, the "about to reach the critical crystallization concentration range" mentioned above refers to the difference between the concentration of the solution and the critical crystallization concentration range being within a preset difference range. The preset difference range can be preset, and the embodiment of the present invention does not limit the specific value of the preset difference range.

[0058] During the energy release process, the solvent vapor in the evaporator / condenser 20 will enter the absorber / generator 10, and the solution can be circulated through the first circulation pipe 60 and the third circulation pipe 92 at the same time. The third heat exchange module 91 and the first heat exchange module 30 are both introduced with low-temperature medium, so that the solvent vapor can be heat exchanged at the same time, thereby accelerating the condensation efficiency of the solvent vapor. The solvent vapor can be converted into a liquid solvent at a faster rate, so that it can be mixed with the concentrated solution in the absorber / generator 10 more quickly. Since the efficiency of the concentrated solution becoming thinner increases, it can be dissolved faster in the crystallization pool 32, and ultimately the efficiency of energy release is improved.

[0059] Whether in the energy storage process or the energy release process, the solution circulates through the first circulation pipe 60. Based on this, in one embodiment, the first circulation pipe 60 may be provided with a first pump body 62, and the first pump body 62 is used to drive the solution 80 to flow from the first end of the first circulation pipe 60 to the second end of the first circulation pipe 60. Similarly, when the energy storage device disclosed in the embodiment of the present invention includes a third circulation pipe 92, the third circulation pipe 92 may be provided with a second pump body 922, and the second pump body 922 is used to drive the solution 80 to flow from the first end of the third circulation pipe 92 to the second end of the third circulation pipe 92.

[0060] Similarly, during the energy release process, the liquid solvent 81 needs to circulate through the second circulation pipe 70, exchanging heat with the second heat exchange module 50, thereby being heated and converted into solvent vapor. Based on this, in one embodiment, the second circulation pipe 70 can be provided with a third pump body 72. The third pump body 72 is used to drive the liquid solvent 82 from the first end of the second circulation pipe 70 to the second end of the second circulation pipe 70. The second circulation pipe 70 can be provided with a sixth valve 73 to control its on / off. After energy storage or energy release is completed, the sixth valve 73 and / or the third pump body 72 can be closed to terminate the flow circulation of the liquid solvent.

[0061] In one embodiment, the first end of the first circulation pipe 60 can be directly connected to the bottom end of the absorber / generator 10, and the second end of the first circulation pipe 60 can be directly connected to the top end of the absorber / generator 10. Similarly, the first end of the third circulation pipe 92 can be directly connected to the bottom end of the absorber / generator 10, and the second end of the third circulation pipe 92 can be directly connected to the top end of the absorber / generator 10.

[0062] In another embodiment, the energy storage device may further include a first common pipe 93, which is provided with a first valve 931. The first valve 931 is used to control the opening and closing of the first common pipe 93. The first end of the first common pipe 93 is connected to the bottom end of the absorber / generator 10, and the first end of the first circulation pipe 60 and the first end of the second circulation pipe 70 can be connected in parallel to the second end of the first common pipe 93. This structure allows the first circulation pipe 60 and the second circulation pipe 70 to share the first common pipe 93, which helps to simplify the structure of the energy storage device. This structure can achieve liquid discharge control at the bottom end of the absorber / generator 10 by controlling the opening and closing of the first common pipe 931, thereby eliminating the need to separately provide first valves 931 on the first circulation pipe 60 and the third circulation pipe 92 for separate control. This can simplify the structure of the energy storage device and simplify the operation of the operator.

[0063] When the energy storage device disclosed in an embodiment of the present invention further includes a third heat exchange module 91 and a third circulation pipe 92, in a specific embodiment, the third heat exchange module 91 and the first heat exchange module 30 are distributed in the horizontal direction, and the third spray structure 921 set at the second end of the third circulation pipe 92 and the first spray structure 61 set at the second end of the first circulation pipe 60 are distributed in the horizontal direction, and can be respectively located above the heat exchange portion of the third heat exchange module 91 and the heat exchange portion of the first heat exchange module 30.

[0064] In another specific embodiment, the heat exchange portion of the third heat exchange module 91 can be located above the heat exchange portion of the first heat exchange module 30, the heat exchange portion of the third heat exchange module 91 can be located below the first spray structure 61 set at the second end of the first circulation pipe 60, and the third spray structure 921 set at the second end of the third circulation pipe 92 can be located above the heat exchange portion of the third heat exchange module 91.

[0065] The energy storage device disclosed in the embodiment of the present invention may also include only the third heat exchange module 91 without the third circulation pipe 92. The heat exchange portion 911 of the third heat exchange module 91 may be located within the absorber / generator 10. The heat exchange portion 911 of the third heat exchange module 91 may be located between the first spray structure 61 and the heat exchange portion of the first heat exchange module 30, so that the crystallization tank 32 of the first heat exchange module 30 receives the solution 80 passing through the heat exchange portion 911 of the third heat exchange module 91.

[0066] To improve heat exchange efficiency, in this embodiment of the present invention, the heat exchange sections of the first heat exchange module 30, the second heat exchange module 50, and the third heat exchange module 91 are all curved pipes. Specifically, the heat exchange sections of the first heat exchange module 30 and the third heat exchange module 91 are curved pipes that extend and curve within the absorber / generator 10. Of course, these heat exchange sections can also be finned heat exchange structures, and this embodiment of the present invention does not limit the specific structure of the heat exchange sections.

[0067] As can be seen from the description of the operating process above, the connecting line 40 is used to connect the absorber / generator 10 and the evaporator / condenser 20 during the energy storage and release processes, thereby allowing the passage of solvent vapor. In embodiments of the present invention, the connecting line 40 can be of various types. In one embodiment, the connecting line 40 can be a single tube. The single tube can be equipped with a valve to control its opening and closing. After energy storage or energy release is completed, the valve can be closed, thereby isolating the absorber / generator 10 from the evaporator / condenser 20.

[0068] The connecting pipe 40 can be of various types, and the present invention is not limited thereto. In another embodiment, the connecting pipe 40 may include a first branch pipe 41 and a second branch pipe 42, which are connected in parallel. Both ends of the first branch pipe 41 and the second branch pipe 42 are connected to the top of the absorber / generator 10 and the top of the evaporator / condenser 20, respectively. The first branch pipe 41 is provided with a second valve 411 for controlling its on / off operation, and the second branch pipe 42 is provided with a third valve 421 for controlling its on / off operation. The second branch pipe 42 is also provided with a transformer 422, which is used to regulate the pressure in the absorber / generator 10 and / or the evaporator / condenser 20 during the energy storage process or the energy release process. This pressure regulation can help improve energy storage efficiency or energy release efficiency. Specifically, during the energy storage process, the transformer can reduce the pressure in the absorber / generator 10, thereby making it easier for the liquid solvent 81 in the solution 80 to evaporate and turn into solvent vapor, thereby increasing the efficiency of the solution's concentration and crystallization, which helps improve energy storage efficiency. Similarly, during the energy release process, the transformer can reduce the pressure in the evaporator / condenser 20 so that the liquid solvent in the evaporator / condenser 20 can evaporate more easily and turn into solvent vapor, thereby allowing the solvent vapor to more efficiently pass through the connecting pipe 40 and enter the absorber / generator 10 to participate in the dilution solution 80.

[0069] The transformer 422 can have various structures. For example, the transformer 422 can be a device that drives gas flow, such as an air pump. The transformer 422 can include two parallel air pumps, which can be installed in parallel on the second branch pipe 42. The two parallel air pumps can be a first air pump and a second air pump. During the energy storage process, the first air pump is turned on and the second air pump is turned off. The first air pump is used to extract solvent vapor from the absorber / generator 10 and drive the solvent vapor into the evaporator / condenser 20 more quickly to reduce the pressure in the absorber / generator 10, thereby making evaporation in the absorber / generator 10 easier. During the energy storage process, the first air pump is turned off and the second air pump is turned on. The second air pump is used to extract solvent vapor from the evaporator / condenser 20 and drive the solvent vapor into the absorber / generator 10 more quickly to reduce the pressure in the evaporator / condenser 20, thereby making evaporation in the evaporator / condenser 20 easier.

[0070] The embodiment of the present invention does not limit the specific type of transformer 422, as long as it can drive the solvent vapor to flow toward the evaporator / condenser 20 or absorber / generator 10 during the energy storage process or the energy release process to reduce the pressure of the space where the solvent vapor flows out.

[0071] This structure enables the energy storage device to have both a variable pressure mode and a non-variable pressure mode. In the variable pressure mode, the second valve 411 is closed and the third valve 421 is open, so that the solvent vapor flows between the absorber / generator 10 and the evaporator / condenser 20 through the second branch pipe 42 instead of the first branch pipe 41. The solvent vapor passing through the second branch pipe 42 will be affected by the transformer 422. Due to the presence of the transformer 422, the efficiency of energy storage and energy release can be improved. In the non-variable pressure mode, the second valve 411 is open and the third valve 421 is closed, so that the solvent vapor flows between the absorber / generator 10 and the evaporator / condenser 20 through the first branch pipe 41 instead of the second branch pipe 42. The solvent vapor will not be affected by the transformer 422 if it does not pass through the second branch pipe 42. It can be seen that the energy storage device with this structure can switch between the variable pressure mode and the non-variable pressure mode, which is conducive to improving the working diversity of the energy storage device.

[0072] In one embodiment, both ends of the first branch pipe 41 and the second branch pipe 42 can be directly connected to the top of the absorber / generator 10 and the top of the evaporator / condenser 20, respectively. In another embodiment, the connecting pipeline 40 disclosed in the embodiment of the present invention can also include a second common pipe 43 and a third common pipe 44.

[0073] The first end of the second common pipe 43 is connected to the top of the absorber / generator 10. The first end of the first branch pipe 41 and the first end of the second branch pipe 42 are connected in parallel to the second end of the second common pipe 43. The first end of the third common pipe 44 is connected to the top of the evaporator / condenser 20, and the second end of the first branch pipe 41 and the second end of the second branch pipe 42 are connected in parallel to the second end of the third common pipe 44. This structure enables the first branch pipe 41 and the second branch pipe 42 to be indirectly connected to the absorber / generator 10 and the evaporator / condenser 20 through a common pipeline. Neither the first branch pipe 41 nor the second branch pipe 42 need to be long, which helps to streamline the pipeline structure.

[0074] During the actual operation, the solution 80 may be lost (for example, adhering to the inner wall of the absorber / generator 10 or adhering to the inner wall of the first circulation pipe 60 and the second circulation pipe 70). Based on this, the energy storage device disclosed in the embodiment of the present invention may further include a negative pressure suction structure 94, which may include a negative pressure suction pipe 941, a negative pressure pump 943 and a fourth valve 942. The energy storage device disclosed in the embodiment of the present invention may further include a solution replenishing structure 95, which includes a solution replenishing pipeline 951 having one end for communicating with a solution source and the other end for communicating with the bottom end of the absorber / generator 10. A fifth valve 952 is installed on the solution replenishing pipeline 951, and the fifth valve 952 is used to control the on-off of the solution replenishing pipeline 951.

[0075] The first end of the negative pressure suction pipe 941 is connected to the third common pipe 44. The fourth valve 942 is provided on the negative pressure suction pipe 941 and is used to control the opening and closing of the negative pressure suction pipe 941. The negative pressure pump 943 is provided on the negative pressure suction pipe 941 and is located on the side of the fourth valve 942 adjacent to the second end of the negative pressure suction pipe 941.

[0076] After energy storage is completed or energy release is completed, the second valve 411 or the third valve 421 can be opened to put the connecting pipeline 40 in a connected state, and the fourth valve 942 and the negative pressure pump 943 can be opened at the same time. The negative pressure pump 943 will evacuate the absorber / generator 10 and the evaporator / condenser 20 through the negative pressure suction pipe 941. When the negative pressure in the absorber / generator 10 reaches the preset negative pressure threshold, the negative pressure pump 943 can be turned off and the fifth valve 952 can be opened. The solution in the solution source enters the absorber / generator 10 under the action of the negative pressure adsorption in the absorber / generator 10, thereby replenishing the absorber / generator 10 with solution 80.

[0077] After the solution 80 is replenished, the negative pressure pump 943, the fourth valve 942, and the fifth valve 952 are closed. During the solution replenishment process, mixed air is likely to enter the absorber / generator 10. Therefore, the negative pressure pump 943 and the fourth valve 942 can be opened again to exhaust the air that has entered the absorber / generator 10, thereby avoiding the influence of air on energy storage or energy release.

[0078] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims, all of which are within the protection of this application.

Claims

1. An energy storage device, characterized in that: It includes an absorber / generator (10), an evaporator / condenser (20), a first heat exchange module (30), a connecting pipeline (40), a second heat exchange module (50), a first circulation pipe (60) and a second circulation pipe (70); The top end of the absorber / generator (10) can be communicated with the top end of the evaporator / condenser (20) through the connecting pipe (40); the first end of the first circulation pipe (60) is connected to the bottom end of the absorber / generator (10), the second end of the first circulation pipe (60) is connected to the top end of the absorber / generator (10) and extends to the interior of the top end of the absorber / generator (10), and the second end of the first circulation pipe (60) is provided with a first spray structure (61); the first heat exchange module (30) includes a crystallization pool (32) provided in the absorber / generator (10), and the first spray structure (61) is located above the crystallization pool (32); The heat exchange portion of the second heat exchange module (50) is arranged in the evaporator / condenser (20), the first end of the second circulation pipe (70) is connected to the bottom end of the evaporator / condenser (20), the second end of the second circulation pipe (70) extends to the interior of the top end of the evaporator / condenser (20) and is provided with a second spray structure (71), and the second spray structure (71) is located above the heat exchange portion of the second heat exchange module (50); the absorber / generator (10) is used to accommodate a solution (80) with a solvent (81) as a solvent and a solute capable of crystallizing, and the evaporator / condenser (20) is used to accommodate the solvent (81).

2. The energy storage device according to claim 1, characterized in that The first heat exchange module (30) includes a plurality of crystallization pools (32) and a first heat exchange medium pipe (31), wherein the plurality of crystallization pools (32) are distributed in sequence in a vertical direction so that the crystallization pool (32) located below two adjacent crystallization pools (32) receives the solution flowing down from the crystallization pool (32) above, and the first heat exchange medium pipe (31) is connected to the plurality of crystallization pools (32).

3. The energy storage device according to claim 1, characterized in that The energy storage device further comprises a third heat exchange module (91) and a third circulation pipe (92); the heat exchange portion (911) of the third heat exchange module (91) is arranged inside the absorber / generator (10); the first end of the third circulation pipe (92) is connected to the bottom end of the absorber / generator (10); the second end of the third circulation pipe (92) extends to the interior of the top end of the absorber / generator (10) and is provided with a third spray structure (921); the third spray structure (921) is located above the heat exchange portion (911) of the third heat exchange module (91).

4. The energy storage device according to claim 3, characterized in that A first pump body (62) is provided on the first circulation pipe (60), and the first pump body (62) is used to drive the solution (80) to flow from the first end of the first circulation pipe (60) to the second end of the first circulation pipe (60); a second pump body (922) is provided on the third circulation pipe (92), and the second pump body (922) is used to drive the solution (80) to flow from the first end of the third circulation pipe (92) to the second end of the third circulation pipe (92).

5. The energy storage device according to claim 4, characterized in that The energy storage device further comprises a first common pipe (93), the first common pipe (93) being provided with a first valve (931), the first valve (931) being used to control the opening and closing of the first common pipe (93), the first end of the first common pipe (93) being connected to the bottom end of the absorber / generator (10), the first end of the first circulation pipe (60) and the first end of the third circulation pipe (70) being connected in parallel to the second end of the first common pipe (93).

6. The energy storage device according to claim 1, characterized in that The energy storage device further comprises a third heat exchange module (91), a heat exchange portion (911) of the third heat exchange module (91) being arranged within the absorber / generator (10), and the heat exchange portion (911) of the third heat exchange module (91) being located between the first spray structure (61) and the heat exchange portion of the first heat exchange module (30), so that the crystallization pool (32) of the first heat exchange module (30) receives the solution (80) that has passed through the heat exchange portion (911) of the third heat exchange module (91).

7. The energy storage device according to claim 3 or 6, characterized in that: The heat exchange portion of the first heat exchange module (30) and the heat exchange portion (911) of the third heat exchange module (91) are curved pipelines that bend and extend within the absorber / generator (10).

8. The energy storage device according to claim 1, characterized in that The connecting pipeline (40) includes a first branch pipe (41) and a second branch pipe (42); the first branch pipe (41) and the second branch pipe (42) are connected in parallel, and both ends of the first branch pipe (41) and the second branch pipe (42) are respectively connected to the top of the absorber / generator (10) and the top of the evaporator / condenser (20); the first branch pipe (41) is provided with a second valve (411) for controlling its on-off, the second branch pipe (42) is provided with a third valve (421) for controlling its on-off, and the second branch pipe (42) is provided with a transformer (422), and the transformer (422) is used to adjust the pressure on both sides thereof.

9. The energy storage device according to claim 8, characterized in that The connecting pipeline (40) further includes a second common pipe (43) and a third common pipe (44), wherein the first end of the second common pipe (43) is connected to the top end of the absorber / generator (10), and the first end of the first branch pipe (41) and the first end of the second branch pipe (42) are connected in parallel to the second end of the second common pipe (43); the first end of the third common pipe (44) is connected to the top end of the evaporator / condenser (20), and the second end of the first branch pipe (41) and the second end of the second branch pipe (42) are connected in parallel to the second end of the third common pipe (44).

10. The energy storage device according to claim 9, characterized in that: The energy storage device also includes a negative pressure suction structure (94), which includes a negative pressure suction pipe (941), a negative pressure pump (943) and a fourth valve (942). The first end of the negative pressure suction pipe (941) is connected to the third common pipe (44). The fourth valve (942) is provided on the negative pressure suction pipe (941) and is used to control the opening and closing of the negative pressure suction pipe (941). The negative pressure pump (943) is provided on the negative pressure suction pipe (941) and is located on the side of the fourth valve (942) adjacent to the second end of the negative pressure suction pipe (941).

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