Phase change energy storage device

Abstract

The invention discloses a phase change energy storage device, and relates to the technical field of phase change heat exchange. The phase change energy storage device is arranged between the heat source unit and the water outlet module and comprises a shell and an energy storage module arranged in the shell, the energy storage module is provided with a fluid channel and a phase change energy storage cavity filled with a solid-liquid phase change material, the fluid channel and the phase change energy storage cavity are independently arranged, and liquid in the fluid channel exchanges heat with the solid-liquid phase change material. The process that cold water in a pipeline must be discharged in order to obtain hot water in a traditional system is avoided, and invalid waste of water resources is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of phase change heat transfer, in particular to a phase change energy storage device. BACKGROUND

[0002] In the field of domestic hot water supply, gas water heaters and solar water heating systems are the two most widely used types of hot water supply equipment. Their core function is to provide users with hot water that meets temperature requirements to meet the daily use needs of scenarios such as washing, bathing, and kitchen water use. To ensure the stability and continuity of hot water supply, domestic gas water heaters and solar water heating systems in the prior art are usually equipped with a hot water storage tank (also known as a hot water tank), which serves as a heat storage component and can temporarily store heated hot water to avoid hot water supply interruptions caused by insufficient instantaneous heating power or unstable energy supply, thereby improving system reliability.

[0003] In the prior art, domestic gas water heaters and solar water heating systems usually use hot water storage tanks for heat storage. Because there is a long connecting pipeline between the hot water storage tank and the water terminal, cold water will remain in the pipeline for a long time. When the user opens the faucet, the cold water in the pipeline must be drained before hot water that meets the temperature requirements can be obtained, which not only severely affects the user's experience, but also causes a large amount of water waste. SUMMARY

[0004] The purpose of the present application is to provide a phase change energy storage device that can quickly heat the cold water section in the pipeline.

[0005] Embodiments of the present application are implemented as follows: The present application provides a phase change energy storage device arranged between a heat source unit and a water outlet module, comprising a housing and an energy storage module arranged in the housing. The energy storage module has a fluid passage and a phase change energy storage chamber filled with solid-liquid phase change material. The fluid passage and the phase change energy storage chamber are independently arranged. The liquid in the fluid passage exchanges heat with the solid-liquid phase change material.

[0006] Optionally, as an implementable way, the fluid passage and the phase change energy storage chamber each include a plurality of fluid passages arranged to form a fluid passage layer, and a plurality of phase change energy storage chambers arranged to form a phase change energy storage layer. The fluid passage layer and the phase change energy storage layer are stacked alternately to form the energy storage module.

[0007] Optionally, as an implementable way, the fluid passage and the phase change energy storage chamber each include a plurality of fluid passages arranged to form a fluid passage layer, and a plurality of phase change energy storage chambers arranged to form a phase change energy storage layer. The fluid passage layer and the phase change energy storage layer are stacked alternately to form the energy storage module.

[0008] Optionally, as an implementable approach, both the fluid channel and the phase change energy storage chamber include multiple chambers, with multiple phase change energy storage chambers arranged around the outside of each fluid channel.

[0009] Optionally, as an implementable approach, the energy storage module includes multiple spaced-apart heat-conducting plates, with a bent plate sandwiched between two adjacent heat-conducting plates. The bent plate and the two adjacent heat-conducting plates are connected to form the fluid channel layer or the phase change energy storage chamber, and the heat-conducting plates and the bent plate are connected by diffusion welding.

[0010] Alternatively, as an implementable approach, the multiple fluid channels of the fluid channel layer are bent and extended.

[0011] Alternatively, as an implementable method, some of the fluid channels in the fluid channel layer are bent and extended, while some of the fluid channels in the fluid channel layer are extended vertically.

[0012] Optionally, as an implementable method, the housing is further provided with an inlet and an outlet, the inlet being connected to a heat source unit via a pipe, and the outlet being connected to a water outlet module via a pipe, the arrangement direction of the inlet and the outlet being consistent with the extension direction of the fluid channel.

[0013] Alternatively, as an implementable method, the housing is a double-layer stainless steel structure with a vacuum insulation layer or reflective film in between.

[0014] Optionally, as an implementable approach, the energy storage module includes multiple stacked flow channel plates, with a fluid channel layer or a phase change energy storage chamber between two adjacent flow channel plates.

[0015] The beneficial effects of the embodiments of this application include: The phase change energy storage device provided in this application is installed between the heat source unit and the water outlet module. It includes a housing and an energy storage module housed within the housing. The energy storage module has a fluid channel and a phase change energy storage chamber filled with a solid-liquid phase change material. The fluid channel and the phase change energy storage chamber are independently configured, and the liquid in the fluid channel exchanges heat with the solid-liquid phase change material. By installing the phase change energy storage device between the heat source unit and the water outlet module, and utilizing the phase change heat storage characteristics of the solid-liquid phase change material, the cold water stagnating in the pipeline can be rapidly heated. Users can obtain hot water at the required temperature immediately after turning on the water terminal without waiting for the cold water to be drained, greatly improving convenience and user experience. This avoids the process of draining cold water from the pipeline to obtain hot water, as is common in traditional systems, reducing the ineffective waste of water resources. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is one of the structural schematic diagrams of the phase change energy storage device provided in the embodiments of this application; Figure 2 This is a second schematic diagram of the phase change energy storage device provided in the embodiments of this application; Figure 3 This is one of the structural schematic diagrams of the energy storage module in the phase change energy storage device provided in the embodiments of this application; Figure 4 This is the second schematic diagram of the energy storage module in the phase change energy storage device provided in the embodiments of this application.

[0018] Icons: 100-Phase change energy storage device; 110-Shell; 111-Inlet; 112-Outlet; 120-Energy storage module; 121-Heat conduction plate; 122-Bent plate; 123-Fluid channel layer; 1231-Fluid channel; 124-Phase change energy storage layer; 1241-Phase change energy storage chamber; 125-Heat exchange layer; 200-Heat source unit; 300-Water outlet module. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0021] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0022] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0023] Please refer to Figure 1 , Figure 2 and Figure 3 This embodiment provides a phase change energy storage device 100, which is disposed between a heat source unit 200 and a water outlet module 300. It includes a housing 110 and an energy storage module 120 disposed within the housing 110. The energy storage module 120 has a fluid channel 1231 and a phase change energy storage chamber 1241 filled with a solid-liquid phase change material. The fluid channel 1231 and the phase change energy storage chamber 1241 are respectively and independently disposed. The liquid in the fluid channel 1231 exchanges heat with the solid-liquid phase change material.

[0024] Specifically, the phase change energy storage device 100 is positioned between the heat source unit 200 and the water outlet module 300. The heat source unit 200 can be a household gas water heater, solar water heating system, or other equipment capable of generating hot water, while the water outlet module 300 corresponds to a household water terminal such as a faucet or shower head. The device specifically includes a housing 110 and an energy storage module 120 housed within the housing 110. The energy storage module 120 is the core component for heat storage and exchange, and it has independently configured fluid channels 1231 and a phase change energy storage chamber 1241. The phase change energy storage chamber 1241 is filled with a solid-liquid phase change material. It should be noted that the solid-liquid phase change material can be selected based on the typical temperature requirements of household hot water, such as paraffin-based phase change materials or fatty acid-based phase change materials with a phase change temperature range of 40-60℃, ensuring that it can achieve phase change heat storage when heated by the hot water in the heat source unit 200, and effectively release heat when heating cold water.

[0025] In actual operation, the hot water generated by the heat source unit 200 first flows into the fluid channel 1231 of the phase change energy storage device 100. Since the fluid channel 1231 and the phase change energy storage chamber 1241 are independent of each other and can exchange heat, when the hot water flows in the fluid channel 1231, it will transfer heat to the solid-liquid phase change material in the phase change energy storage chamber 1241, causing the solid-liquid phase change material to absorb heat and undergo a phase change (from solid to liquid), thereby storing the heat. When the user turns on the water outlet module 300 to use water, if the cold water stagnating in the pipeline flows through the fluid channel 1231, the solid-liquid phase change material storing heat in the phase change energy storage chamber 1241 will undergo a reverse phase change (from liquid to solid), releasing the stored heat to heat the cold water in the fluid channel 1231, so that the water flowing out of the water outlet module 300 can quickly reach the required temperature.

[0026] The phase change energy storage device 100 provided in this application is disposed between the heat source unit 200 and the water outlet module 300. It includes a housing 110 and an energy storage module 120 disposed within the housing 110. The energy storage module 120 has a fluid channel 1231 and a phase change energy storage chamber 1241 filled with a solid-liquid phase change material. The fluid channel 1231 and the phase change energy storage chamber 1241 are independently configured, and the liquid in the fluid channel 1231 exchanges heat with the solid-liquid phase change material. By setting the phase change energy storage device 100 between the heat source unit 200 and the water outlet module 300, and utilizing the phase change heat storage characteristics of the solid-liquid phase change material, the cold water stagnating in the pipeline can be rapidly heated. Users can obtain hot water at the required temperature immediately after turning on the water terminal without waiting for the cold water to be discharged, greatly improving convenience and user experience. This avoids the process of draining cold water from the pipeline to obtain hot water, as is common in traditional systems, reducing the ineffective waste of water resources.

[0027] In one possible embodiment of this application, such as Figure 1 and Figure 3 As shown, both the fluid channel 1231 and the phase change energy storage chamber 1241 include multiple fluid channels 1231 arranged to form a fluid channel layer 123, and the multiple phase change energy storage chambers 1241 arranged to form a phase change energy storage layer 124. The fluid channel layer 123 and the phase change energy storage layer 124 are stacked alternately to form an energy storage module 120.

[0028] Specifically, multiple fluid channels 1231 are arranged at a preset interval to form a fluid channel layer 123. The fluid channels 1231 in each fluid channel layer 123 can be arranged in parallel to ensure uniform water flow distribution. Multiple phase change energy storage chambers 1241 are also arranged at a preset interval to form a phase change energy storage layer 124. The phase change energy storage chambers 1241 are filled with solid-liquid phase change material, and the position of each phase change energy storage chamber 1241 corresponds to the position of the fluid channels 1231 in the fluid channel layer 123 to improve heat exchange efficiency. Subsequently, the fluid channel layer 123 and the phase change energy storage layer 124 are stacked alternately to form a complete energy storage module 120, for example, by adopting a stacking sequence of "fluid channel layer 123 - phase change energy storage layer 124 - fluid channel layer 123 - phase change energy storage layer 124", so that adjacent fluid channel layers 123 and phase change energy storage layers 124 can fully contact each other and maximize the heat exchange area. By arranging multiple fluid channels 1231 and phase change energy storage chambers 1241 in layers and stacking them in an alternating manner, the contact area between the fluid channels 1231 and the phase change energy storage chambers 1241 is greatly increased, making heat transfer more efficient and significantly improving the heat exchange efficiency of the heat storage and heat release process, and enabling faster heating of cold water in the pipeline.

[0029] During operation, hot water from the heat source unit 200 flows into multiple fluid channels 1231 of the fluid channel layer 123. Heat is transferred through the walls of the fluid channels 1231 to the solid-liquid phase change material in the adjacent phase change energy storage layer 124, achieving heat storage. When cold water flows through the fluid channels 1231, the phase change material in the adjacent phase change energy storage layer 124 releases heat, which is transferred to the cold water through the walls of the fluid channels 1231, completing the heating process. Due to the layered stacked structure, multiple fluid channels 1231 and phase change energy storage chambers 1241 participate in heat exchange simultaneously, which can significantly improve heat exchange efficiency and heat storage capacity.

[0030] In one possible embodiment of this application, such as Figure 1 and Figure 4 As shown, both the fluid channel 1231 and the phase change energy storage chamber 1241 include multiple fluid channels 1231 and phase change energy storage chamber 1241. The fluid channels 1231 and the phase change energy storage chamber 1241 are arranged alternately to form a heat exchange layer 125. The heat exchange layer 125 includes multiple layers stacked sequentially. The fluid channels 1231 of two adjacent heat exchange layers 125 are arranged alternately along the stacking direction.

[0031] Specifically, within a single heat exchange layer 125, multiple fluid channels 1231 and multiple phase change energy storage chambers 1241 are arranged alternately and interleaved, for example, in a linear interleaving pattern of "fluid channel 1231-phase change energy storage chamber 1241-fluid channel 1231-phase change energy storage chamber 1241" or in a matrix interleaving pattern, so that each fluid channel 1231 can contact the phase change energy storage chamber 1241, ensuring sufficient heat exchange within a single heat exchange layer 125. Subsequently, multiple heat exchange layers 125 with the above structure are assembled in a sequentially stacked manner, with the fluid channels 1231 of adjacent heat exchange layers 125 staggered along the stacking direction. The fluid channels 1231 of the upper heat exchange layer 125 correspond to the phase change energy storage chambers 1241 of the lower heat exchange layer 125, further enhancing the heat storage and release capabilities of the device.

[0032] In one possible embodiment of this application, such as Figure 1 and Figure 4 As shown, both the fluid channel 1231 and the phase change energy storage chamber 1241 include multiple ones, and multiple phase change energy storage chambers 1241 are arranged around the outside of each fluid channel 1231.

[0033] Specifically, multiple phase change energy storage chambers 1241 are evenly distributed around a single fluid channel 1231. For example, four, six, or eight phase change energy storage chambers 1241 can be arranged around a single fluid channel 1231. The phase change energy storage chambers 1241 and the fluid channel 1231 are separated by a heat-conducting wall to ensure rapid heat transfer. Multiple unit structures of "central fluid channel 1231 + surrounding phase change energy storage chambers 1241" can be arranged in an array to form a complete energy storage module 120. The fluid channels 1231 between each unit structure can be connected by a manifold to achieve centralized inflow and outflow of water.

[0034] During operation, hot water flows from the manifold into each fluid channel 1231. The solid-liquid phase change material in the phase change energy storage chamber 1241 surrounding each fluid channel 1231 simultaneously absorbs heat and stores heat through phase change. When cold water flows through the fluid channel 1231, the phase change material in the surrounding multiple phase change energy storage chambers 1241 simultaneously releases heat, heating the cold water in the fluid channel 1231 from multiple directions to ensure rapid and uniform heating.

[0035] In one possible embodiment of this application, such as Figure 1 and Figure 3 As shown, the energy storage module 120 includes multiple heat-conducting plates 121 stacked at intervals, with a bent plate 122 sandwiched between two adjacent heat-conducting plates 121. The bent plate 122 and the two adjacent heat-conducting plates 121 are connected to form a fluid channel layer 123 or a phase change energy storage chamber 1241.

[0036] Specifically, the energy storage module 120 includes multiple spaced-apart heat-conducting plates 121. The heat-conducting plates 121 are made of materials with excellent thermal conductivity, such as aluminum plates, copper plates, or stainless steel plates, to ensure rapid heat transfer. A bent plate 122 is sandwiched between two adjacent heat-conducting plates 121. The bent plate 122 is also made of thermally conductive material, and its shape can be bent into U-shape, V-shape, or wavy shape as needed. The two sides of the bent plate 122 are connected to the surfaces of the two adjacent heat-conducting plates 121 respectively. Through this connection, a closed cavity is formed between the bent plate 122 and the two adjacent heat-conducting plates 121. This closed cavity can serve as the fluid channel 1231 of the fluid channel layer 123 or the phase change energy storage chamber 1241.

[0037] In specific assembly, to form a fluid channel layer 123, a bent plate 122 of a specific shape can be selected, so that the two ends of the formed closed cavity are open, serving as the inflow and outflow ends of the fluid; to form a phase change energy storage chamber 1241, a bent plate 122 with closed ends can be selected, or the two ends of the cavity can be sealed, and then a solid-liquid phase change material can be filled into the cavity. By alternately setting the bent plates 122 used to form the fluid channel 1231 and the bent plates 122 used to form the phase change energy storage chamber 1241, an alternately stacked fluid channel layer 123 and a phase change energy storage layer 124 can be formed between multiple spaced-overlapping heat-conducting plates 121.

[0038] Furthermore, the energy storage module includes multiple stacked flow channel plates, with semi-circular flow channels, capillary flow channels, or corrugated flow channels etched on the surface of the flow channel plates. The space between two adjacent flow channel plates can serve as a fluid channel 1231 of the fluid channel layer 123 or a phase change energy storage chamber 1241. The multiple stacked flow channel plates are connected by diffusion welding.

[0039] In one possible embodiment of this application, such as Figure 1 and Figure 3 As shown, the multiple fluid channels 1231 of the fluid channel layer 123 are bent and extended.

[0040] Specifically, in the fluid channel layer 123, each fluid channel 1231 does not extend in a straight line, but extends after multiple bends, such as using U-shaped bends, serpentine bends, or spiral bends. Multiple bend-extended fluid channels 1231 are arranged in parallel to form the fluid channel layer 123, and the inflow and outflow ends of each fluid channel 1231 converge and connect to ensure that water can flow in and out smoothly.

[0041] During operation, hot or cold water flows in the bent and extended fluid channel 1231. The flow path is significantly longer than that of a straight channel, thereby increasing the residence time of the fluid in the channel. This allows for more thorough heat exchange between the fluid and the phase change energy storage chamber 1241, improving the efficiency of heat storage and release.

[0042] In one possible embodiment of this application, such as Figure 1 and Figure 3 As shown, the fluid channels 1231 of a portion of the fluid channel layer 123 are bent and extended, while the fluid channels 1231 of a portion of the fluid channel layer 123 are extended vertically.

[0043] Specifically, the energy storage module 120 consists of multiple alternately stacked fluid channel layers 123 and phase change energy storage layers 124. Some fluid channel layers 123 have fluid channels 1231 with bent extension structures (such as serpentine or U-shaped), while others have fluid channels 1231 with vertically extending straight structures. These two types of fluid channel layers 123 are alternately arranged between the phase change energy storage layers 124, for example, stacked in the order of "bent extension fluid channel layer 123 - phase change energy storage layer 124 - vertically extending fluid channel layer 123 - phase change energy storage layer 124 - bent extension fluid channel layer 123". The bent extension fluid channel layers 123 ensure sufficient heat exchange, while the vertically extending fluid channel layers 123 ensure a faster water flow velocity. The combination of these two features allows the device to achieve efficient heat exchange without causing water flow obstruction due to excessive channel resistance, thus balancing the requirements of heat exchange efficiency and flow efficiency.

[0044] In one possible embodiment of this application, such as Figure 1 , Figure 2 and Figure 3 As shown, the housing 110 is also provided with an inlet 111 and an outlet 112. The inlet 111 is connected to the heat source unit 200 through a pipe, and the outlet 112 is connected to the water outlet module 300 through a pipe. The arrangement direction of the inlet 111 and the outlet 112 is consistent with the extension direction of the fluid channel 1231.

[0045] Specifically, the housing 110 of the device is provided with an inlet 111 and an outlet 112. The inlet 111 is connected to the outlet of the heat source unit 200 through a pipe, and the outlet 112 is connected to the inlet of the water outlet module 300 through a pipe. The arrangement direction of the inlet 111 and the outlet 112 is consistent with the extension direction of the fluid channel 1231 in the heat exchange layer 125. This design allows water to flow directly and smoothly into the fluid channel 1231 of each heat exchange layer 125 after flowing in from the inlet 111, without changing the flow direction, thus reducing water flow resistance loss. After heat exchange is completed in the fluid channel 1231, the water can flow directly out from the outlet 112, further ensuring the smooth flow of water. At the same time, the consistency between the extension direction of the inlet 111 and the outlet 112 and the fluid channel 1231 also facilitates the connection and arrangement of pipes, improving the ease of device installation.

[0046] Furthermore, the shell 110 has a double-layer stainless steel structure, with a vacuum insulation layer or reflective film in between.

[0047] In one possible embodiment of this application, such as Figure 1 , Figure 2 and Figure 3 As shown, the heat-conducting plate 121 and the bent plate 122 are connected by diffusion welding. Diffusion welding is a welding method that brings the surfaces of two workpieces into contact under high temperature and pressure, causing atomic diffusion to occur and thus forming a metallurgical bond. During the assembly of this device, the connecting surfaces of the heat-conducting plate 121 and the bent plate 122 are ground and cleaned to remove the oxide layer and impurities. Then, the two are placed together in the diffusion welding equipment and diffusion welding is performed under preset temperature, pressure, and holding time conditions to ensure that a strong metallurgical bond is formed. Through diffusion welding, the connecting surfaces of the heat-conducting plate 121 and the bent plate 122 can achieve atomic-level bonding. This not only results in high connection strength, capable of withstanding the pressure of water flow and the force of phase change material volume change, but also eliminates gaps between the connecting surfaces, reduces thermal resistance, and allows heat to be transferred quickly and smoothly between the heat-conducting plate 121 and the bent plate 122, further improving the heat exchange efficiency of the device.

[0048] Furthermore, a temperature sensing interface can be provided on the housing 110, through which a temperature sensor can be installed to detect the temperature inside the cavity.

[0049] The phase change energy storage device 100 can also be installed in the preheating branch at the cold water inlet, in the circulating return water pipe, at the front end of the shower (near-end installation), at the rear end of the booster pump, integrated inside the water heater (as a factory module), or in a hybrid system combined with a solar water heater to achieve shorter waiting times and faster hot water response. Multiple energy storage modules 120 can also be installed within the casing 110 to increase heating efficiency, applicable to scenarios such as hotels, schools, catering drinking water, and industrial waste heat recovery. The casing 110 can be configured as a sphere, cylinder, or cuboid shape depending on the application scenario, and the energy storage modules 120 are also configured with corresponding shapes based on the shape of the casing 110.

[0050] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A phase change energy storage device, characterized in that, Located between the heat source unit and the water outlet module, the device includes a housing and an energy storage module disposed within the housing. The energy storage module has a fluid channel and a phase change energy storage chamber filled with a solid-liquid phase change material. The fluid channel and the phase change energy storage chamber are independently configured, and the liquid in the fluid channel exchanges heat with the solid-liquid phase change material.

2. The phase change energy storage device according to claim 1, characterized in that, Both the fluid channels and the phase change energy storage chambers include multiple fluid channels, which are arranged to form a fluid channel layer, and the multiple phase change energy storage chambers are arranged to form a phase change energy storage layer. The fluid channel layer and the phase change energy storage layer are stacked alternately to form the energy storage module.

3. The phase change energy storage device according to claim 1, characterized in that, Both the fluid channels and the phase change energy storage chambers include multiple fluid channels and phase change energy storage chambers, which are arranged alternately to form a heat exchange layer. The heat exchange layer includes multiple layers stacked sequentially, and the fluid channels of adjacent heat exchange layers are staggered along the stacking direction.

4. The phase change energy storage device according to claim 1, characterized in that, Both the fluid channel and the phase change energy storage chamber are multiple, and multiple phase change energy storage chambers are arranged around the outside of each fluid channel.

5. The phase change energy storage device according to claim 2, characterized in that, The energy storage module includes multiple heat-conducting plates stacked at intervals, with a bent plate sandwiched between two adjacent heat-conducting plates. The bent plate and the two adjacent heat-conducting plates are connected to form the fluid channel layer or the phase change energy storage chamber. The heat-conducting plates and the bent plate are connected by diffusion welding.

6. The phase change energy storage device according to claim 2, characterized in that, The fluid channel layer has multiple fluid channels that are bent and extended.

7. The phase change energy storage device according to claim 2, characterized in that, The fluid channels of some fluid channel layers are bent and extended, while the fluid channels of some fluid channel layers are extended vertically.

8. The phase change energy storage device according to claim 3, characterized in that, The housing is also provided with an inlet and an outlet. The inlet is connected to the heat source unit through a pipe, and the outlet is connected to the water outlet module through a pipe. The arrangement direction of the inlet and the outlet is consistent with the extension direction of the fluid channel.

9. The phase change energy storage device according to claim 2, characterized in that, The energy storage module includes multiple stacked flow channel plates, with the fluid channel layer or the phase change energy storage chamber located between two adjacent flow channel plates.

10. The phase change energy storage device according to claim 1, characterized in that, The shell is a double-layer stainless steel structure, with a vacuum insulation layer or reflective film in the middle.

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