Phase change energy storage device and phase change energy storage equipment

Abstract

The present disclosure provides a phase change energy storage device and phase change energy storage equipment, which relate to the field of phase change energy storage technology. The phase change energy storage device includes: a main body, a cavity is formed inside, and the cavity is used to accommodate phase change energy storage materials; a plurality of through pipes extending upright from the upper surface of the main body to the lower surface, each through pipe is suitable for allowing the heat exchange fluid distributed on the upper surface of the main body to flow in under the action of gravity, and flow out after heat exchange with the phase change energy storage material through the through pipe; and a plurality of fixing components, each of which is arranged on the upper surface and the lower surface of the main body in an upper and lower alignment, and is suitable for cooperating with the fixing component fixing component of another stacked phase change energy storage device to limit the relative position of the two phase change energy storage devices in the horizontal direction.

Description

Technical Field

[0001] The present disclosure relates to the technical field of phase change energy storage, and in particular to a phase change energy storage device and a phase change energy storage equipment. Background Art

[0002] As a type of energy storage device, phase change energy storage equipment can store a large amount of cold energy and meet users' cooling needs at specific times, effectively reducing the pressure of peak loads.

[0003] In the related technology, due to the use of inorganic salt materials with large phase change cold storage potential, the phase change energy storage device in the phase change energy storage equipment needs to use non-corrosive plastic materials, but the thermal conductivity of plastic materials is low, and there is a lack of enhanced heat transfer means, resulting in the phase change energy storage device The cold storage rate is not high enough; the phase change energy storage equipment lacks a reasonable structural design and operation strategy, which ultimately leads to a low cold storage rate of the overall phase change energy storage device. At present, the means of enhancing heat transfer for phase change energy storage devices is mainly to increase the heat exchange area, but simply improving the appearance of the outer surface of the phase change energy storage device will reduce the phase change rate. Summary of the invention

[0004] In view of this, the present disclosure provides a phase change energy storage device and a phase change energy storage equipment, which can increase the energy storage rate.

[0005] As one aspect of the embodiments of the present disclosure, a phase-change energy storage device is provided, comprising a main body, a plurality of through-tubes and a plurality of fixing assemblies. A cavity is formed inside the main body, and the cavity is used to accommodate phase-change energy storage materials; a plurality of through-tubes extend upright from the upper surface of the main body to the lower surface, and each of the through-tubes is adapted to allow the heat exchange fluid distributed on the upper surface of the main body to flow in under the action of gravity, and to flow out after heat exchange with the phase-change energy storage materials through the through-tubes; each of the fixing assemblies is arranged on the upper and lower surfaces of the main body in an aligned manner, and is adapted to cooperate with the fixing assembly of another stacked phase-change energy storage device to limit the relative positions of the two phase-change energy storage devices in the horizontal direction.

[0006] According to an embodiment of the present disclosure, each fixing member fixing assembly includes a receiving portion and an inserting portion. The receiving portion extends from one of the upper surface or the lower surface of the above-mentioned main body portion in the height direction, and the inserting portion extends outward from the other of the upper surface or the lower surface of the above-mentioned main body portion in the above-mentioned height direction, and is aligned with the above-mentioned receiving portion up and down to be inserted into the receiving portion of the above-mentioned other phase change energy storage device.

[0007] According to an embodiment of the present disclosure, each of the above-mentioned fixing member fixing assemblies further includes a plurality of load-bearing members, and the plurality of load-bearing members are arranged between the above-mentioned receiving portion and the above-mentioned plug-in portion.

[0008] According to an embodiment of the present disclosure, the upper and lower surfaces of the above-mentioned load-bearing member are respectively recessed inwardly along the above-mentioned height direction to form a buffer zone, so as to disperse part of the load through the above-mentioned buffer zone.

[0009] According to an embodiment of the present disclosure, the above-mentioned phase change energy storage device further includes a charging port, which is opened on a side wall of the above-mentioned phase change energy storage device and is suitable for loading the above-mentioned phase change energy storage material into the above-mentioned cavity.

[0010] As another aspect of the embodiments of the present disclosure, a phase-change energy storage device is provided, comprising a shell and multiple layers of stacked phase-change energy storage components. A accommodating chamber is formed inside the shell, and the upper portion of the accommodating chamber has a liquid inlet, and the lower portion has a liquid outlet. The multiple layers of stacked phase-change energy storage components are installed in the accommodating chamber, and each layer of the phase-change energy storage components comprises: a plurality of any one of the above-mentioned phase-change energy storage devices. The heat exchange fluid flows in from the liquid inlet, flows from the phase-change energy storage component located at the top through the through pipe, and then flows into the phase-change energy storage component located at the bottom, and is discharged from the liquid outlet.

[0011] According to an embodiment of the present disclosure, the shell includes a liquid inlet, a heat exchange part and a liquid outlet in sequence according to the flow direction of the heat exchange fluid. The liquid inlet is provided at the upper part of the liquid inlet. A stepped mounting surface with a decreasing height along the flow direction is provided in the heat exchange part to install the phase change energy storage component. The heat exchange fluid from the liquid inlet exchanges heat with the phase change energy storage material in the phase change energy storage device in the heat exchange part. The liquid outlet is provided at the bottom of the liquid outlet, and the heat exchange fluid after heat exchange flows out from the liquid outlet through the liquid outlet.

[0012] According to an embodiment of the present disclosure, the radial dimension of the heat exchange portion decreases along the flow direction, so that the flow velocity of the heat exchange fluid increases in the flow direction, thereby accelerating the phase change of the phase change energy storage material in the phase change energy storage device near the liquid outlet.

[0013] According to an embodiment of the present disclosure, the above-mentioned phase change energy storage device also includes a liquid distributor, which is arranged in the above-mentioned accommodating cavity and is located above the multi-layer stacked above-mentioned phase change energy storage components, and is suitable for evenly distributing the above-mentioned heat exchange fluid flowing in from the above-mentioned liquid inlet on the surface of the above-mentioned phase change energy storage device located at the top.

[0014] According to an embodiment of the present disclosure, the above-mentioned phase change energy storage equipment also includes a water collector, which is connected to the above-mentioned liquid outlet, is arranged in the above-mentioned accommodating cavity, and is located below the multiple above-mentioned phase change energy storage devices, and is suitable for collecting the above-mentioned heat exchange fluid after heat exchange and discharging it from the above-mentioned liquid outlet.

[0015] According to the phase-change energy storage device of the embodiment of the present disclosure, a plurality of through-tubes are arranged between the upper surface and the lower surface of the main body, allowing the heat exchange fluid distributed on the upper surface of the main body to flow in under the action of gravity, thereby increasing the heat exchange area of ​​the phase-change energy storage device, improving the flow state of the heat exchange fluid, further strengthening the heat exchange, and increasing the energy storage rate. In addition, by arranging a plurality of through-tubes, it is also possible to strengthen the load-bearing capacity of the phase-change energy storage device, prevent the phase-change energy storage device from deformation, and further improve the stability of the multi-layer stacked phase-change energy storage device and the uniformity of heat exchange. By arranging a plurality of fixed components aligned up and down on the upper and lower surfaces of the main body, it is possible to prevent the stability of the stacked multiple phase-change energy storage devices from being destroyed when the heat exchange fluid passes through when multiple phase-change energy storage devices are stacked in multiple layers, and to avoid displacement of the multiple phase-change energy storage devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and other objects, features and advantages of the present disclosure will become more apparent through the following description of the embodiments of the present disclosure with reference to the accompanying drawings, in which:

[0017] Figure 1 A perspective view of a phase change energy storage device according to an embodiment of the present disclosure is schematically shown;

[0018] Figure 2 A three-dimensional perspective view of a phase change energy storage device according to an embodiment of the present disclosure is schematically shown;

[0019] Figure 3 A schematic top view of a phase change energy storage device according to an embodiment of the present disclosure is shown;

[0020] Figure 4 Schematically shows Figure 3 A cross-sectional view of AA of the phase change energy storage device shown;

[0021] Figure 5 Schematically shows Figure 3 A cross-sectional view of the phase change energy storage device BB shown;

[0022] Figure 6 Schematically showing a stereoscopic view of a phase change energy storage assembly according to some embodiments of the present disclosure;

[0023] Figure 7 Schematically showing a stereoscopic view of a phase change energy storage assembly according to some other embodiments of the present disclosure;

[0024] Figure 8 Schematically showing a three-dimensional view of a phase change energy storage device according to some embodiments of the present disclosure;

[0025] Fig. 9 Schematically shows Figure 8 A cross-sectional view of the phase change energy storage device shown along the length direction;

[0026] Fig.10 Schematically shows Figure 8 A cross-sectional view of the phase change energy storage device shown along the radial direction;

[0027] Fig.11 Schematically showing a three-dimensional view of a liquid inlet plate according to some embodiments of the present disclosure;

[0028] Fig.12 Schematically showing a stereoscopic view of a phase change energy storage device according to some other embodiments of the present disclosure;

[0029] Fig.13 Schematically shows a top view of a liquid distributor according to some embodiments of the present disclosure;

[0030] Fig.14 Schematically showing a top view of a water collector according to some embodiments of the present disclosure; and

[0031] Fig.15 The figure schematically shows a thermal performance test diagram of a phase change energy storage material according to an embodiment of the present disclosure.

[0032] Description of reference numerals:

[0033] 1-shell; 11-liquid inlet; 12-liquid outlet; 13-liquid inlet portion; 14-heat exchange portion; 141-mounting surface; 15-liquid outlet portion; 16-liquid inlet plate; 161-liquid inlet through hole;

[0034] 2-phase change energy storage device; 21-body; 22-through pipe; 23-load bearing member; 231-buffer; 24-fixing assembly; 241-receiving part; 242-insertion part; 25-recessed part; 26-charging port;

[0035] 3-liquid distributor; 4-water collector; 41-groove; 42-collecting trough; 5-bracket. DETAILED DESCRIPTION

[0036] In order to make the objectives, technical solutions and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0037] The terms used herein are only for describing specific embodiments and are not intended to limit the present disclosure. The terms "comprise", "include", etc. used herein indicate the existence of the features, steps, operations and / or components, but do not exclude the existence or addition of one or more other features, steps, operations or components.

[0038] All terms used herein, including technical and scientific terms, have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification, and should not be interpreted in an idealized or overly rigid manner.

[0039] When using expressions such as "at least one of A, B, and C, etc.", it should generally be interpreted as the meaning of the expression generally understood by those skilled in the art. For example, "a system having at least one of A, B, and C" should include but not be limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc. When using expressions such as "at least one of A, B, or C, etc.", it should generally be interpreted as the meaning of the expression generally understood by those skilled in the art. For example, "a system having at least one of A, B, or C" should include but not be limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.

[0040] It should also be noted that the directional terms mentioned in the embodiments, such as "upper", "lower", "front", "back", "left", "right", etc., are only reference directions of the drawings and are not intended to limit the scope of protection of the present disclosure. Throughout the drawings, the same elements are represented by the same or similar reference numerals. Conventional structures or configurations will be omitted when they may cause confusion in the understanding of the present disclosure.

[0041] Figure 1 A three-dimensional diagram of a phase change energy storage device according to an embodiment of the present disclosure is schematically shown. Figure 2 A three-dimensional perspective view of a phase-change energy storage device according to an embodiment of the present disclosure is schematically shown.

[0042] As one aspect of the embodiments of the present disclosure, a phase change energy storage device 2 is provided. Figure 1 and Figure 2 As shown, the phase change energy storage device 2 includes a main body 21, a plurality of through pipes 22 and a plurality of fixed components 24. A cavity is formed inside the main body 21, and the cavity is used to accommodate the phase change energy storage material. The plurality of through pipes 22 extend upright from the upper surface of the main body 21 to the lower surface, and each through pipe 22 is suitable for allowing the heat exchange fluid distributed on the upper surface of the main body 21 to flow in under the action of gravity, and flow out after heat exchange with the phase change energy storage material through the through pipe 22. Each of the plurality of fixed components 24 is arranged on the upper surface and the lower surface of the main body 21 in an upper and lower alignment, and is suitable for cooperating with the fixed component 24 of another stacked phase change energy storage device 2 to limit the relative position of the two phase change energy storage devices 2 in the horizontal direction.

[0043] According to the phase-change energy storage device 2 of the embodiment of the present disclosure, a plurality of through-tubes 22 are arranged between the upper surface and the lower surface of the main body 21, allowing the heat exchange fluid distributed on the upper surface of the main body 21 to flow in under the action of gravity, thereby increasing the heat exchange area of ​​the phase-change energy storage device 2, improving the flow state of the heat exchange fluid, further strengthening the heat exchange, and increasing the energy storage rate. In addition, by arranging a plurality of through-tubes 22, it is also possible to strengthen the load-bearing capacity of the phase-change energy storage device 2, prevent the phase-change energy storage device 2 from being deformed, and further improve the stability and uniformity of heat exchange of the multi-layer stacked phase-change energy storage device 2. By arranging a plurality of fixed components 24 aligned up and down on the upper and lower surfaces of the main body 21, it is possible to prevent the stability of the stacked multiple phase-change energy storage devices 2 from being destroyed when the heat exchange fluid passes through when multiple phase-change energy storage devices 2 are stacked in multiple layers, and avoid displacement of the multiple phase-change energy storage devices 2.

[0044] According to an embodiment of the present disclosure, the horizontal cross-section of the phase-change energy storage device 2 may be polygonal, circular, or elliptical.

[0045] In an exemplary embodiment, the phase change energy storage device 2 may be a substantially rectangular parallelepiped structure, and the length ( Figure 3 The viewing angle shown is from the left edge of the mounting portion to the right edge) is the width ( Figure 3 The viewing angle shown is a multiple of the upper edge to the lower edge of the mounting portion).

[0046] In an illustrative embodiment, the length of the phase-change energy storage device 2 is twice as long as its width. It is understandable that the length of the phase-change energy storage device 2 may also be 1.5 times, 2.5 times, 3 times, or 4 times as long as its width.

[0047] According to an embodiment of the present disclosure, the material of the phase change energy storage device 2 can be plastic.

[0048] According to an embodiment of the present disclosure, the edge of the main body 21 may be a rounded structure to increase the maximum bearing pressure of the main body 21 .

[0049] In an illustrative embodiment, Figure 1 and Figure 2 As shown, the main body 21 is a substantially rectangular parallelepiped structure, and the eight vertices and twelve edges of the main body 21 are rounded structures.

[0050] According to an embodiment of the present disclosure, the phase change energy storage material includes a phase change cold storage material and a phase change heat storage material. The phase change energy storage material can be filled into the phase change energy storage device according to actual needs.

[0051] Figure 3 Schematically shows a top view of a phase change energy storage device according to an embodiment of the present disclosure, Figure 4 Schematically shows Figure 3 A cross-sectional view of AA of the phase change energy storage device is shown.

[0052] According to the embodiments of the present disclosure, Figures 1 to 4 As shown, each fixing assembly 24 includes a receiving portion 241 and an inserting portion 242. The receiving portion 241 extends from one of the upper surface or the lower surface of the body portion 21 along the height direction ( Figure 4 The plug-in portion 242 extends outwardly from the other of the upper surface or the lower surface of the main body portion 21 in the height direction and is aligned with the receiving portion 241 up and down to be inserted into the receiving portion 241 of another phase change energy storage device 2.

[0053] In an illustrative embodiment, the receiving portion 241 extends outwardly from one of the upper surface or the lower surface of the main body 21 in the height direction. When the plug-in portion 242 is inserted into the receiving portion 241 of another phase-change energy storage device 2, a flow space allowing the flow of heat exchange fluid can be formed between two adjacent surfaces of two stacked phase-change energy storage devices 2 through the receiving portion 241. In this way, after the heat exchange fluid flows into the flow space from the through hole on the upper phase-change energy storage device 2, it flows in the flow space and then flows into the through hole on the lower phase-change energy storage device 2.

[0054] In such an embodiment, at least one of the upper surface and the lower surface of the main body 21 can extend outward along the height direction along the edge of the upper surface or the lower surface to form a circle of flange to limit the heat exchange fluid on the upper surface of the main body 21, so that the heat exchange fluid can flow in from multiple through pipes as much as possible.

[0055] In an alternative embodiment, the through hole on the upper phase-change energy storage device 2 may be aligned with the through hole on the lower phase-change energy storage device 2. The receiving portion 241 extends inwardly from one of the upper surface or the lower surface of the body portion 21 along the height direction.

[0056] According to the embodiments of the present disclosure, Figure 4 As shown, each fixing assembly 24 further includes a plurality of load-bearing members 23 , and the plurality of load-bearing members 23 are disposed between the receiving portion 241 and the inserting portion 242 .

[0057] According to an embodiment of the present disclosure, the upper and lower surfaces of the load-bearing member 23 are respectively recessed inwardly along the height direction to form a buffer zone, so as to disperse part of the load through the buffer zone.

[0058] In an illustrative embodiment, Figure 4 As shown, two buffer parts 231 are formed by extending from the middle of the load bearing member 23 along the height direction toward the upper surface and the lower surface close to the main body 21. The radius of the buffer part 231 increases gradually along the extension direction.

[0059] In an illustrative embodiment, Figure 3The surface shown can be used as the upper surface of the main body 21. In another exemplary embodiment, Figure 3 The illustrated surface may serve as the lower surface of the body portion 21 .

[0060] Figure 5 Schematically shows Figure 3 A cross-sectional view of a phase change energy storage device taken along line BB is shown.

[0061] According to the embodiments of the present disclosure, Figure 5 As shown, the diameter of the through tube 22 increases from the middle of the through tube 22 toward the upper surface and the lower surface of the main body 21, that is, the diameter of the through tube 22 in the middle is the smallest, and the diameters at both ends are the largest, thereby reducing the pressure loss of the heat exchange fluid flow.

[0062] According to the embodiment of the present disclosure, the surface of the body 21 is connected to the through pipe 22 via an arc. Figure 5 From the perspective shown, the upper surface of the body 21 is connected to the upper end of the through-tube 22 via a first arc, and the lower surface of the body 21 is connected to the lower end of the through-tube 22 via a second arc. In this way, the connection between the through-tube 22 and the body 21 can be more stable, and the heat exchange fluid can flow into the through-tube 22.

[0063] According to the embodiment of the present disclosure, the aperture and spacing of the through pipes 22 can be obtained from the heat exchange fluid and heat transfer calculation results.

[0064] According to the embodiments of the present disclosure, Figures 1 to 3 As shown, the phase change energy storage device 2 further includes a charging port 26 , which is opened on a side wall of the phase change energy storage device 2 and is suitable for charging the phase change energy storage material into the cavity.

[0065] In an illustrative embodiment, a side wall of the main body 21 is horizontally recessed inward to form a recess 25 , and a mounting portion is horizontally extended outward from the bottom of the recess 25 . The loading port 26 is opened at one end away from the bottom of the recess 25 .

[0066] In such an embodiment, the length of the mounting portion ( Figure 3 The length from the left edge to the right edge of the mounting portion (from the perspective shown) is less than or equal to the recessed length of the recessed portion 25 to prevent the mounting opening from extending out of the recessed portion 25.

[0067] In such an embodiment, the end of the mounting portion close to the mounting opening has a first thread. The matching portion is threadedly matched with the first thread to close the cavity. The matching portion has a second thread threadedly matched with the first thread. It can be understood that when the first thread is an internal thread, the second thread is an external thread; when the first thread is an external thread, the second thread is an internal thread.

[0068] In an alternative embodiment, a charging port 26 is provided on a side wall of the main body 21, and a mounting portion is formed by extending inward from the charging port 26. The mounting portion has internal threads formed inside, which are threadedly matched with the mating portion having external threads to close the cavity.

[0069] In an illustrative embodiment, the phase change energy storage device can be blow-molded in a mold, and a cylindrical structure can be pre-set in the mold at the through pipe 22. After blow molding, the through pipe 22 structure can be completed by a punching device at a later stage.

[0070] In an alternative embodiment, the phase-change energy storage device 2 can be formed by 3D printing.

[0071] According to the embodiment of the present disclosure, the phase change energy storage device 2 can be used in the temperature range allowed by the phase change energy storage material, for example, a temperature range of several tens of degrees below zero to about 100 degrees above zero.

[0072] In an illustrative embodiment, the aspect ratio of the phase change energy storage device 2 is 2:1, the length×width×height of the phase change energy storage device 2 is 500×250×32 mm, and the fillet radii of the eight vertices and twelve edges of the main body 21 are all 10 mm.

[0073] According to the embodiments of the present disclosure, the thickness of the phase change energy storage device 2 should be determined by calculating the overall force of the phase change energy storage device 2 and retaining a certain margin. The specific size of the phase change energy storage device 2 is calculated based on the storage energy of the phase change energy storage device 2 and the heat exchange fluid.

[0074] Figure 6 Schematically shows a stereoscopic view of a phase change energy storage assembly according to some embodiments of the present disclosure, Figure 7 A stereoscopic view of a phase change energy storage assembly according to some other embodiments of the present disclosure is schematically shown.

[0075] According to the embodiments of the present disclosure, Figure 6 and Figure 7 As shown, the phase-change energy storage assembly includes a plurality of horizontally arranged phase-change energy storage devices 2. Multiple layers of phase-change energy storage assemblies can be stacked by a fixing assembly 24.

[0076] According to an embodiment of the present disclosure, the phase change energy storage device 2 can be arranged in a manner of one layer of phase change energy storage device 2 on top of another layer of phase change energy storage device 2, and the phase change energy storage device 2 located on the upper portion is arranged by rotating 90 degrees or 180 degrees in a horizontal plane with the midpoint of the upper and lower surfaces of the phase change energy storage device 2 as the center of the circle.

[0077] In an illustrative embodiment, Figure 6As shown, each phase-change energy storage assembly includes two phase-change energy storage devices 2. The phase-change energy storage device 2 at the bottom and the phase-change energy storage device 2 at the top form an interlocking structure through a fixing assembly 24 to improve the stability of the connection between the two phase-change energy storage assemblies.

[0078] In another exemplary embodiment, Figure 7 As described above, each phase-change energy storage assembly may include 8 phase-change energy storage devices 2 .

[0079] In an illustrative embodiment, on the neutral plane parallel to the upper surface of the phase-change energy storage device 2, there is a circle with a diameter of 10 mm at 100 mm from each of the four square vertices, and two circles of the same specification are equidistantly distributed between two circles farther away, for a total of 8 circles. From these circles, the lower surface of the phase-change energy storage device 2 is vertically and evenly lofted, and the diameter of the circle gradually increases during the lofting process, forming a circle with a diameter of 20 mm at the lower surface. On the upper surface, the above-mentioned lofting process is extended to 8 mm from the maximum surface, and a fillet with a radius of 8 mm is made from there to the maximum surface. On the lower surface, the bottom of the 8 mm fillet on the symmetric surface is extended upward by 8 mm, and a fillet with a radius of 8 mm is made at the vertex. In this way, the fixed component 24 and the load-bearing member 23 of the phase-change energy storage device 2 are formed.

[0080] The mounting portion of the body 21 is located on one of the side walls, and the charging port 26 is opened at one end away from the body 21. A side wall of the body 21 is recessed 20 mm inward in the horizontal direction to form a trapezoidal recess 25. The bottom edge of the recess 25 is 80 mm, the top edge is 120 mm, the mounting portion has a 10 mm long external thread structure, and is equipped with a nut seal with an internal thread.

[0081] On the upper surface of the body 21, in addition to the above-mentioned fixing assembly 24 and the load-bearing member 23, other areas are evenly distributed with through pipes 22 at intervals of 40 mm. The through pipes 22 are arranged at intervals of 20 mm along the length direction from the vertex of the body 21 near the charging port 26, and are distributed in an array between the upper and lower surfaces of the body 21. The diameter of the through pipes 22 is 3 mm, and the wall thickness of the body 21 is 2 mm.

[0082] Figure 8 A perspective view of a phase change energy storage device according to some embodiments of the present disclosure is schematically shown.

[0083] As another aspect of the embodiments of the present disclosure, a phase change energy storage device is provided. Figure 8As shown, the phase change energy storage device includes a shell 1 and multiple layers of stacked phase change energy storage components. A accommodating chamber is formed inside the shell 1, and the upper part of the accommodating chamber has a liquid inlet 11, and the lower part has a liquid outlet 12. The multiple layers of stacked phase change energy storage components are installed in the accommodating chamber, and each layer of phase change energy storage components includes a plurality of any of the above-mentioned phase change energy storage devices 2. The heat exchange fluid flows in from the liquid inlet 11, flows from the phase change energy storage component at the top through the through pipe 22, and then flows into the phase change energy storage component at the bottom, and is discharged from the liquid outlet 12.

[0084] According to the phase-change energy storage device of the embodiment of the present disclosure, a plurality of phase-change energy storage components are arranged in the accommodating cavity, each phase-change energy storage component includes a plurality of phase-change energy storage devices 2, and a plurality of through pipes 22 are provided in each phase-change energy storage device 2 to allow the heat exchange fluid distributed on the upper surface of the main body 21 to flow in under the action of gravity. The plurality of through pipes 22 are used to increase the heat exchange area between the heat exchange fluid and the main body 21, thereby shortening the cold storage and release rate of the phase-change energy storage device.

[0085] Fig. 9 Schematically shows Figure 8 A cross-sectional view of the phase change energy storage device along the length direction is shown. Fig.10 Schematically shows Figure 8 A cross-sectional view of the phase change energy storage device along the radial direction is shown.

[0086] According to the embodiments of the present disclosure, Fig. 9 As shown, the shell 1 includes a liquid inlet 13, a heat exchange part 14 and a liquid outlet 15 in sequence according to the flow direction of the heat exchange fluid. The liquid inlet 11 is opened at the upper part of the liquid inlet 13. A stepped mounting surface 141 with decreasing height along the flow direction is provided in the heat exchange part 14 to install the phase change energy storage component. The heat exchange fluid from the liquid inlet 13 exchanges heat with the phase change energy storage material in the phase change energy storage device 2 in the heat exchange part 14. The liquid outlet 12 is opened at the bottom of the liquid outlet 15, and the heat exchange fluid after heat exchange flows out from the liquid outlet 15 through the liquid outlet 12.

[0087] According to the embodiment of the present disclosure, by providing a stepped mounting surface 141 with decreasing flow direction and height in the heat exchange portion 14, the height difference between the liquid inlet and the liquid outlet of the heat exchange portion 14 is increased, and the flow resistance of the heat exchange fluid is reduced.

[0088] According to the embodiments of the present disclosure, Figure 8 As shown, the phase change energy storage device further includes a bracket 5. The housing 1 is constructed as a barrel-shaped structure and is installed on the bracket 5 in a downwardly inclined manner along the flow direction of the heat exchange fluid to further increase the height difference of the heat exchange fluid flow and reduce the flow resistance.

[0089] According to the embodiment of the present disclosure, the angle between the axis of the shell 1 and the horizontal plane is greater than 0° and less than 45°. For example, it can be any one of 10°, 20°, 25°, 30°, 35° or 40°. The angle should make the heat exchange fluid in the heat exchange part 14 flow evenly through the surface of the phase change energy storage device 2 and the through pipe 22, and ensure that the heat exchange fluid at each location can flow freely to the liquid outlet 12. The specific angle can be obtained by the heat exchange fluid in the heat exchange part 14 and the heat transfer calculation.

[0090] In an illustrative embodiment, Fig. 9 As shown, the cross-sections of the liquid inlet 13 and the liquid outlet 15 may be configured to be arc-shaped to facilitate the inflow and discharge of the heat exchange fluid.

[0091] According to an embodiment of the present disclosure, the radial dimension of the heat exchange portion 14 decreases along the flow direction, so that the flow velocity of the heat exchange fluid increases in the flow direction, thereby accelerating the phase change of the phase change energy storage material in the phase change energy storage device 2 near the liquid outlet 15.

[0092] According to the embodiments of the present disclosure, when the flow rate of the heat exchange fluid is high, more heat can be taken away, and the phase change energy storage material in the phase change energy storage assembly first contacts the part of the heat exchange fluid and changes phase first. When the heat exchange fluid reaches the rear part of the heat exchange part 14 (that is, the phase change energy storage device 2 near the liquid outlet end), the heat exchange temperature difference will decrease. By setting the radial dimension of the heat exchange part 14 to decrease along the flow direction, the cross-sectional area of ​​the heat exchange part 14 becomes smaller and smaller along the flow direction, and the pressure of the heat exchange fluid increases, resulting in an increase in the flow rate. In this way, the phase change of the phase change material in the rear phase change energy storage device 2 can be accelerated, avoiding the problem that the phase change of the material in the front part of the heat exchange part 14 (that is, the phase change energy storage device 2 near the liquid inlet end) is completed, and the rear part has not started to change phase. Gravity is used to reduce the flow resistance of the heat exchange fluid, accelerate the flow of the fluid along the flow direction of the heat exchange fluid, strengthen the heat exchange of the phase change energy storage material in the rear part of the flow direction, and expand the scope of application of the phase change energy storage device.

[0093] Fig.11 A perspective view of a liquid inlet plate according to some embodiments of the present disclosure is schematically shown.

[0094] According to the embodiments of the present disclosure, Fig.11 As shown, the liquid inlet portion 13 is connected to the heat exchange portion 14 via a liquid inlet plate 16. The liquid inlet plate 16 is provided with a plurality of liquid inlet through holes 161 to allow the heat exchange fluid in the liquid inlet portion 13 to flow into the heat exchange portion 14 through the plurality of liquid inlet through holes 161.

[0095] In an illustrative embodiment, the number of liquid inlet holes 161 provided on the liquid inlet plate 16 decreases downward along the height direction. Specifically, the number of liquid inlet holes 161 is small near the lower part of the bracket 5, and the number of liquid inlet holes 161 is large at the upper part away from the bracket 5. In this way, fewer liquid inlet holes 161 at the bottom can ensure a more uniform pressure distribution when the heat exchange fluid enters the liquid inlet plate 16. Since the pressure of the heat exchange fluid at the bottom is relatively high, fewer liquid inlet holes 161 can reduce pressure loss and avoid uneven fluid distribution caused by too many liquid inlet holes 161.

[0096] In an exemplary embodiment, a plurality of rows of liquid inlet holes 161 are provided on the liquid inlet plate 16, and the axis of each row of liquid inlet holes 161 is parallel to the horizontal plane. By providing different numbers of liquid inlet holes 161 at different heights, graded control of the flow rate can be achieved. Fewer liquid inlet holes 161 at the bottom can limit the total flow rate, while more liquid inlet holes 161 at the top can ensure that the fluid is distributed more evenly.

[0097] According to an embodiment of the present disclosure, the heat exchange part 14 is connected to the liquid outlet part 15 through a liquid outlet plate. The liquid outlet plate is provided with a plurality of liquid outlet holes to allow the heat exchange fluid in the heat exchanger to flow into the liquid outlet part 15 through the plurality of liquid outlet holes.

[0098] In an illustrative embodiment, a plurality of liquid outlet holes are provided at least at the bottom of the liquid outlet plate, so that the heat exchange fluid after heat exchange can be discharged through the liquid outlet portion 15 .

[0099] In an illustrative embodiment, the shell 1 is surrounded by a truncated cone structure and two circular surfaces. The cross-sections of the two circular surfaces are arc-shaped, and the arc center angles are both 150°. The truncated cone structure constitutes the heat exchange part 14, and the diameter of one end of the heat exchange part 14 is 1450 mm, and the diameter of the other end is 1100 mm. The angle between the lowest straight line of the heat exchange part 14 and the horizontal plane is 40 / 500 (vertical distance / horizontal distance), and the angle between the highest straight line of the heat exchange part 14 and the horizontal plane is 120 / 500. In the heat exchange part 14, a stepped mounting surface 141 is arranged along the flow direction of the heat exchange fluid, and the height difference between the two adjacent mounting surfaces 141 at the lower part is 40 mm (the height of the phase change energy storage device 2), and the height difference between the two adjacent mounting surfaces 141 at the upper part is 120 mm.

[0100] like Fig. 9 As shown, the mounting surface 141 is stepped, and the horizontal intervals of each step can be 125 mm, 250 mm, and 500 mm, and the height difference is an integer multiple of the height of the phase-change energy storage device 2, so as to load the phase-change energy storage device 2 to the maximum extent.

[0101] The phase change energy storage device 2 can be arranged in a staggered manner horizontally and vertically when placed, which is more stable.

[0102] A liquid inlet plate 16 is arranged between the heat exchange portion 14 and the liquid inlet portion 13. According to the water pressure distribution law, the liquid inlet holes 161 on the liquid inlet plate 16 are distributed densely at the top and sparsely at the bottom. The diameter of the liquid inlet holes 161 is 8 mm.

[0103] In an alternative embodiment, the through-tube 22 is vertically lofted from the central axis surface of the two main body parts 21 with a diameter of 5 mm to 8 mm at the upper and lower surfaces, and has a 1 mm rounded structure at the contact with the upper and lower surfaces.

[0104] In such an embodiment, the phase change energy storage device 2 can be blow molded by two independent molds under the condition of stamping, and the mold should have a blowing structure at the load-bearing part 23 to facilitate demolding of the phase change energy storage device 2. Before blow molding, a cylindrical structure for positioning is reserved in the mold, and after blow molding is completed and demolded, a punching device is used to punch holes to form a through pipe 22.

[0105] Fig.12 A three-dimensional view of a phase change energy storage device according to some other embodiments of the present disclosure is schematically shown.

[0106] In other embodiments, Fig.12 As shown, a box-type phase change energy storage device is provided. The housing 1 is constructed in a substantially rectangular shape. The liquid inlet 11 is arranged at the upper part of the side wall of the housing 1, the liquid outlet 12 is arranged at the lower part of the side wall of the housing 1, and an exhaust port is arranged at the top of the housing.

[0107] Fig.13 A top view of a liquid dispenser according to some embodiments of the present disclosure is schematically shown.

[0108] According to the embodiments of the present disclosure, Fig.13 As shown, the phase change energy storage device also includes a liquid distributor 3, which is arranged in the accommodating cavity and located above the multi-layered phase change energy storage components, and is suitable for evenly distributing the heat exchange fluid flowing in from the liquid inlet 11 on the surface of the phase change energy storage device located at the top.

[0109] In an illustrative embodiment, Fig.13 As shown, the liquid distributor 3 may include a water distribution pipe that is coiled multiple times in the same horizontal plane, and a liquid outlet is opened in the part of the water distribution pipe that is coiled multiple times. The liquid inlet end of the liquid distributor 3 is connected to the liquid inlet 11 located on the shell 1. The heat exchange fluid flows into the water distribution pipe from the liquid inlet 11 and flows out from the liquid outlet on the water distribution pipe, thereby distributing the heat exchange fluid on the uppermost phase change energy storage component.

[0110] In such an embodiment, the pipe spacing, pipe diameter and heat exchange fluid outlet position on the pipe of the liquid distributor 3 are determined by experiments and calculations to ensure uniform flow of the heat exchange fluid.

[0111] Fig.14A top view of a water collector according to some embodiments of the present disclosure is schematically shown.

[0112] According to the embodiments of the present disclosure, Fig.14 As shown, the phase change energy storage device further includes a water collector 4. The water collector 4 is connected to the liquid outlet 12, is arranged in the accommodating cavity, and is located below the plurality of phase change energy storage devices, and is suitable for collecting the heat exchange fluid after heat exchange and discharging it from the liquid outlet 12.

[0113] According to an embodiment of the present disclosure, the water collector 4 is arranged at the bottom of the shell 1 and can be integral with the shell 1 or separately provided.

[0114] In an illustrative embodiment, Fig.14 As shown, the surface of the water collector 4 is concave downward to form a plurality of circles of grooves 41 and a confluence groove 42 connected to the plurality of grooves 41 , and one end of the confluence groove 42 is connected to the liquid outlet 12 .

[0115] In such an embodiment, the depth of the confluence groove 42 may be greater than the depth of the groove 41 to facilitate the discharge of the heat exchange fluid.

[0116] According to the embodiment of the present disclosure, the liquid distributor 3 and the water collector 4 should ensure that the flow rate of the heat exchange fluid at the same height in the shell 1 remains consistent.

[0117] According to an embodiment of the present disclosure, the liquid distributor 3 is installed in the housing 1 via a supporting structure.

[0118] In an illustrative embodiment, Figure 6 As shown, in the phase-change energy storage device, the upper and lower surfaces of the two stacked phase-change energy storage devices 2 are parallel and arranged at 90 degrees, and the charging ports 26 are arranged at the farthest distance through the fixing components 24 located on the phase-change energy storage devices 2; the longest sides of the adjacent phase-change energy storage devices 2 on the same layer are connected, and the charging ports 26 face opposite directions. This arrangement allows the heat exchange fluid to flow through the area beside the through pipe 22 and the charging port 26, so that the area through which the heat exchange fluid flows is maximized.

[0119] In another exemplary embodiment, Figure 7 As shown, two adjacent phase-change energy storage devices 2 are stacked up and down, and the phase-change energy storage devices 2 in the same layer are arranged in a mirror-image manner with contact surfaces.

[0120] In an illustrative embodiment, the internal dimensions of the shell 1 are 5000×3000×2000 mm, the liquid inlet 11 and the liquid distributor 3 are located at the upper part of the shell 1, the liquid outlet 12 and the liquid collector are located at the lower part of the shell 1, and the middle part of the shell 1 is filled with the phase change energy storage device 2.

[0121] In the process of realizing the present disclosure, it was found that ordinary expanded graphite itself is hydrophobic and has a much lower density than water, so it is easy to float and will also cause large-scale flow of phase change materials. Substances that are insoluble in water in the liquid state will also precipitate and phase separate, and the material will gradually lose its phase change ability.

[0122] As another aspect of the embodiment of the present disclosure, a phase change cold storage material is provided, comprising 60-80 parts by weight of a phase change material, 10-20 parts by weight of a temperature regulator, 2-5 parts by weight of a nucleating agent, 1-3 parts by weight of a thickener, and 3-35 parts by weight of modified expanded graphite. The phase change cold storage material forms a network heat transfer structure through modified expanded graphite, so that the temperature inside the phase change cold storage material is roughly equal, thereby improving the thermal conductivity of the phase change cold storage material.

[0123] According to the phase-change cold storage material of the embodiment of the present disclosure, by adding modified expanded graphite to form a network heat transfer structure, the temperature inside the phase-change cold storage material is roughly equal, the thermal conductivity of the phase-change cold storage material is improved, the latent heat of phase change can reach 130 J / g, the freeze-thaw cycle stability of the material is improved, and the phenomenon of ordinary expanded graphite failing due to floating is effectively blocked. In addition, the phase-change cold storage material provided by the present disclosure can be industrialized, with low cost and high stability, and the material has great competitiveness in the market.

[0124] According to an embodiment of the present disclosure, the modified expanded graphite includes 1-5 parts by weight of expanded graphite and 2-10 parts by weight of a modifier, wherein the modifier and the expanded graphite form a hydrophilic group to slow down the flow of the modified expanded graphite.

[0125] According to the embodiments of the present disclosure, the modified expanded graphite itself has many pores, and the hydrophilic groups composed of the modifier and the expanded graphite can absorb water and prevent large-scale flow of graphite and phase change material, thereby preventing the floating of graphite. The phase change material can also maintain its phase change ability, thereby improving the freeze-thaw cycle stability of the material.

[0126] According to the embodiments of the present disclosure, the expanded graphite should have a mesh size greater than 200 based on cost and thermal stability of the material.

[0127] In an illustrative embodiment, the weight ratio of the modifier to the expanded graphite is 2: 1. When the ratio of the modifier to the expanded graphite is 2: 1, the expanded graphite formed has the best hydrophilicity, the hydrophilic group of the modifier is best combined with the expanded graphite, and is well compatible with the phase change material (such as sodium sulfate decahydrate).

[0128] In an illustrative embodiment, the weight ratio of the modified expanded graphite to sodium sulfate decahydrate is 9:77.

[0129] According to an embodiment of the present disclosure, the phase change material includes sodium sulfate decahydrate or calcium chloride hexahydrate.

[0130] According to an embodiment of the present disclosure, the temperature regulator includes ammonium chloride.

[0131] According to an embodiment of the present disclosure, the modifier includes a quaternary ammonium salt cationic surfactant. For example, the modifier may be hexadecyltrimethylammonium chloride, or a quaternary ammonium salt cationic surfactant such as hexadecyltrimethylammonium bromide.

[0132] According to an embodiment of the present disclosure, the thickener includes a polymer thickener. For example, the thickener may be sodium polyacrylate, or a polymer thickener such as polyacrylamide.

[0133] In an illustrative embodiment, the phase change cold storage material includes 77 parts by weight of sodium sulfate decahydrate; 13 parts by weight of ammonium chloride; 2 parts by weight of sodium tetraborate decahydrate as a nucleating agent; 1.5 parts by weight of sodium polyacrylate as a thickener; 2.25 parts by weight of expanded graphite; 4.25 parts by weight of hexadecyltrimethylammonium chloride as a modifier; and 61 parts by weight of anhydrous ethanol.

[0134] According to the phase-change cold storage material of the embodiment of the present disclosure, sodium sulfate decahydrate is used as the main phase-change material, and modified expanded graphite is added to enhance the heat transfer performance and stability of the composite material.

[0135] As another aspect of the embodiments of the present disclosure, a method for preparing any of the above-mentioned phase change cold storage materials is provided, comprising:

[0136] Melting and uniformly mixing the phase change material, the nucleating agent, and the temperature regulator to obtain a first mixed solution;

[0137] gradually adding a thickener to the first mixed solution until the first mixed solution becomes viscous and uniform, thereby obtaining a viscous solution; and

[0138] The modified expanded graphite is added to the viscous solution, and the modified graphite and the viscous solution are uniformly stirred to obtain a phase change cold storage material.

[0139] According to the preparation method of the phase-change cold storage material provided by the embodiment of the present disclosure, by adding modified expanded graphite to form a network heat transfer structure, the temperature in the phase-change cold storage material is roughly equal, the thermal conductivity of the phase-change cold storage material is improved, the latent heat of phase change can reach 130 J / g, the freeze-thaw cycle stability of the material is improved, and the phenomenon of ordinary expanded graphite failing due to floating is effectively blocked. In addition, the phase-change cold storage material provided by the present disclosure can be industrialized, with low cost and high stability, and the material has great competitiveness in the market.

[0140] According to an embodiment of the present disclosure, a method for preparing modified expanded graphite includes: uniformly mixing a modifier and a dispersant to obtain a second mixed solution; uniformly mixing the second mixed solution and expanded graphite to obtain a third mixed solution; and heating the third mixed solution to evaporate the dispersant to obtain modified expanded graphite.

[0141] According to an embodiment of the present disclosure, the dispersant may include anhydrous ethanol. When the phase change cold storage material is mass-produced, the evaporated anhydrous ethanol may be collected for recycling.

[0142] According to an embodiment of the present disclosure, before obtaining the second mixed solution and heating it, the process further includes:

[0143] The third mixed solution is placed in an environment where the pressure is lower than the atmospheric pressure, so that the air in the third mixed solution is discharged.

[0144] In an illustrative embodiment, the third mixed solution is placed in an environment with a pressure lower than 0.2 times the atmospheric pressure.

[0145] According to an embodiment of the present disclosure, during the configuration of the phase change cold storage material, except when adding materials into the container and placing it in a low pressure environment, the container should be isolated from the air and the remaining air in the container should be exhausted as much as possible.

[0146] According to some embodiments of the present disclosure, the modifier is first mixed with anhydrous ethanol, completely dissolved under continuous stirring, and then the solution is poured into the expanded graphite and stirred evenly; the mixture is then placed in a low-pressure environment for 5-30 minutes, and then placed in a drying oven at 80-120 degrees Celsius for 5-15 hours, and the resulting material is modified expanded graphite. Sodium sulfate decahydrate, a nucleating agent, and ammonium chloride are placed in a closed environment at 40-50 degrees Celsius until they are completely melted, and a thickener is gradually added while stirring until the material is evenly distributed and viscous, and the modified expanded graphite is added while stirring, and the phase change cold storage material is prepared after the material is evenly distributed.

[0147] In an illustrative embodiment, the modifier is first mixed with anhydrous ethanol and completely dissolved under continuous stirring, and then the second solution is poured into the expanded graphite and stirred evenly; the mixture (third solution) is then placed in a low-pressure environment (for example, the air pressure is less than 0.2 times the atmospheric pressure) for 15 minutes, and then placed in an 80-degree Celsius drying oven for 10 hours, and the resulting material is modified expanded graphite; sodium sulfate decahydrate, a nucleating agent, and ammonium chloride are placed in a closed environment at 45 degrees Celsius until they are completely melted, and while stirring evenly, a thickener is gradually added until the material is evenly distributed and viscous, and finally, the modified expanded graphite is added while stirring, and after the material is evenly distributed, the phase change cold storage material is prepared.

[0148] According to the embodiments of the present disclosure, the stirring part and the container used in the preparation should be made of materials that are not corroded by acid.

[0149] According to an embodiment of the present disclosure, the second solution is poured into the expanded graphite, and the second solution needs to wet every part of the expanded graphite.

[0150] In an illustrative embodiment, 20 g of hexadecyltrimethylammonium chloride is poured into 340 mL of anhydrous ethanol in a glass bottle, and a tetrafluoroethylene stirring paddle is used to stir the hexadecyltrimethylammonium chloride to promote complete dissolution.

[0151] Prepare 10 g of expanded graphite in a glass bottle, pour the above solution evenly into the expanded graphite, and stir evenly with a stirring paddle to ensure that the solution soaks every part of the expanded graphite. Immediately place the mixed material in an environment of 0.1 times atmospheric pressure for 10 minutes, and then place it in an environment of 80℃ for 10 hours. The material obtained in the glass is the modified expanded graphite.

[0152] 100 g of sodium sulfate decahydrate, 16 g of ammonium chloride, and 3 g of sodium tetraborate decahydrate were placed in a glass bottle. The glass bottle was sealed and placed in a 45°C water bath until all the crystals were melted.

[0153] The liquid was stirred at a speed of 600 revolutions per minute using a stirring paddle so that the precipitate was evenly distributed in the liquid under the action of the vortex. After the precipitate was evenly distributed, 2 g of sodium polyacrylate was gradually and evenly added within 1 min while stirring. After continuous stirring for 30 min, 9 g of modified expanded graphite was gradually and evenly added within 1 min while stirring. After the white color was completely invisible in the container, the material was placed in an environment of 0.1 times the atmospheric pressure for 10 min. The resulting material was a phase change cold storage material.

[0154] Fig.15 The figure schematically shows a thermal performance test diagram of a phase change cold storage material according to an embodiment of the present disclosure.

[0155] like Fig.15 As shown, the horizontal axis represents temperature (°C) and the vertical axis represents heat flow (mW / mg). Fig.15 It can be seen that the temperature rise curve of the phase change cold storage material also shows an upward trend with the change of time, and the overall rise is a parabolic linear rise. Correspondingly, the thermogravimetric curve of the phase change cold storage material shows a significant decrease at 10°C. Figure 2 The closed area in the figure (that is, the area formed by the oblique line and the parabola) is the latent heat of phase change of the phase change cold storage material, ranging from 8°C to 18°C. The heating rate during the differential scanning calorimeter (DSC) test was 1°C / min. The area of ​​the closed area is the cold storage capacity of the phase change cold storage material. The results show that the cold storage capacity of the phase change cold storage material is 130 J / g.

[0156] The embodiments of the present disclosure are described above. However, these embodiments are only for illustrative purposes and are not intended to limit the scope of the present disclosure. Although the embodiments are described above separately, this does not mean that the measures in the various embodiments cannot be used in combination to advantage. The scope of the present disclosure is defined by the attached claims and their equivalents. Without departing from the scope of the present disclosure, those skilled in the art may make a variety of substitutions and modifications, which should all fall within the scope of the present disclosure.

Claims

1. A phase change energy storage device, characterized in that: include: A main body portion, wherein a cavity is formed inside, and the cavity is used to accommodate a phase change energy storage material; A plurality of through-tubes extending vertically from the upper surface to the lower surface of the main body, each of the through-tubes being adapted to allow a heat exchange fluid distributed on the upper surface of the main body to flow in under the action of gravity and to flow out after heat exchange with the phase change energy storage material through the through-tubes; as well as A plurality of fixing components, each of which is arranged on the upper surface and the lower surface of the main body in an aligned manner, and is suitable for cooperating with a fixing component of another stacked phase change energy storage device to limit the relative position of the two phase change energy storage devices in the horizontal direction; The upper surface of the main body portion extends upward in the height direction to form a flange circle to limit the heat exchange fluid on the upper surface of the main body portion, so that at least a portion of the heat exchange fluid flows in from the plurality of through pipes.

2. The phase change energy storage device according to claim 1, characterized in that: Each mounting kit includes: a receiving portion extending from one of the upper surface or the lower surface of the main body portion in a height direction; and The plug-in portion extends outwardly from the other of the upper surface or the lower surface of the main body along the height direction and is aligned with the receiving portion up and down to be inserted into the receiving portion of the other phase-change energy storage device.

3. The phase change energy storage device according to claim 2, characterized in that: Each of the fixing components further comprises: A plurality of load-bearing members are arranged between the receiving portion and the inserting portion.

4. The phase change energy storage device according to claim 3, characterized in that: The upper and lower surfaces of the load-bearing member are respectively recessed inwardly along the height direction to form a buffer zone, so as to disperse part of the load through the buffer zone.

5. The phase change energy storage device according to any one of claims 1 to 4, characterized in that: Also includes: A loading port is provided on a side wall of the phase change energy storage device and is suitable for loading the phase change energy storage material into the cavity.

6. A phase change energy storage device, characterized in that: include: A housing, wherein a receiving cavity is formed inside, wherein the receiving cavity has a liquid inlet at the upper portion and a liquid outlet at the lower portion; as well as A multi-layer stacked phase-change energy storage component is installed in the accommodating cavity, and each layer of the phase-change energy storage component comprises: a plurality of phase-change energy storage devices according to any one of claims 1 to 5; The heat exchange fluid flows in from the liquid inlet, flows from the phase-change energy storage component located at the top through the through pipe, flows into the phase-change energy storage component located at the bottom, and is discharged from the liquid outlet.

7. The phase change energy storage device according to claim 6, characterized in that: The shell includes, in order according to the flow direction of the heat exchange fluid: A liquid inlet portion, wherein the liquid inlet is disposed at an upper portion of the liquid inlet portion; A heat exchange part, wherein a stepped mounting surface with decreasing height along the flow direction is provided in the heat exchange part for mounting the phase change energy storage assembly, wherein the heat exchange fluid from the liquid inlet part performs heat exchange with the phase change energy storage material in the phase change energy storage device in the heat exchange part; and The liquid outlet portion, wherein the liquid outlet is opened at the bottom of the liquid outlet portion, and the heat exchange fluid after heat exchange flows out from the liquid outlet portion through the liquid outlet.

8. The phase change energy storage device according to claim 7, characterized in that: The radial dimension of the heat exchange portion decreases along the flow direction, so that the flow velocity of the heat exchange fluid increases in the flow direction, thereby accelerating the phase change of the phase change energy storage material in the phase change energy storage device near the liquid outlet.

9. The phase change energy storage device according to claim 6, characterized in that: Also includes: The liquid distributor is arranged in the accommodating cavity and located above the multi-layered phase change energy storage components, and is suitable for evenly distributing the heat exchange fluid flowing in from the liquid inlet on the surface of the phase change energy storage device located at the top.

10. The phase change energy storage device according to claim 6, characterized in that: Also includes: The water collector is connected to the liquid outlet, is arranged in the accommodating cavity, and is located below the plurality of phase change energy storage devices. The water collector is suitable for collecting the heat exchange fluid after heat exchange and discharging it from the liquid outlet.

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