Electric heat storage device and its control method

Abstract

The present invention discloses an electric heat storage device and its control method. The electric heat storage device includes a heat storage component, a pipeline component, a heating component, and a heat exchange component. The heat storage component is provided with a heat storage cavity; the pipeline component is filled with a binary non-azeotropic working fluid; the heating component is arranged on the heat storage component to heat the binary non-azeotropic working fluid in the pipeline component; the heat exchange component is provided with a heat exchange cavity, and the heat storage cavity is communicated with the heat exchange cavity through the pipeline component. The present invention improves the structure of the electric heat storage device, enhances the reliability and controllability of the electric heat storage device, and improves the heat exchange capacity.

Description

Technical Field

[0001] The present invention relates to the technical field of heat storage electric heating, and particularly to an electric heat storage device and a control method thereof. Background Art

[0002] Energy storage technology can solve the contradiction between energy supply and demand in terms of time and space, and is an effective means to improve energy utilization efficiency. Among them, electric heat storage technology is a technology that converts electric energy into heat energy and stores it using heat storage materials to solve the disadvantage that electric energy cannot be stored in large quantities, so as to be used when needed; as an important technology to improve energy utilization efficiency and protect the environment, electric heat storage can make full use of the price advantage of off-peak electricity, cut peaks and fill valleys, save operating costs, and reduce pollutant emissions. It is not only an objective need for energy utilization but also an inevitable trend for future development.

[0003] Existing electric heat storage devices mainly include heat storage devices, heat exchangers, control boxes, temperature measuring instruments, etc. Water inlets and outlets are respectively provided at both ends of the heat exchanger. The heat storage device includes heat pipes, heat storage bodies, heat insulation layers, electric heating pipes, etc. However, such an electric heat storage device has the problem of low heat exchange efficiency. Summary of the Invention

[0004] The main purpose of the present invention is to provide an electric heat storage device and a control method thereof, aiming to improve the heat exchange capacity of the electric heat storage device.

[0005] To achieve the above object, the present invention provides an electric heat storage device, which includes:

[0006] A heat storage assembly, provided with a heat storage cavity;

[0007] A pipeline assembly, filled with a binary non-azeotropic working fluid;

[0008] A heating assembly, arranged on the heat storage assembly for heating the binary non-azeotropic working fluid in the pipeline assembly; and

[0009] A heat exchange assembly, provided with a heat exchange cavity, and the heat storage cavity is communicated with the heat exchange cavity through the pipeline assembly.

[0010] Optionally, the pipeline assembly includes:

[0011] A heat pipe evaporation section, penetrating through the heat storage cavity and forming the liquid inlet end and the liquid outlet end of the heat storage assembly, and the binary non-azeotropic working fluid is filled in the heat pipe evaporation section;

[0012] An adiabatic pipeline, including a first pipe section and a second pipe section; and

[0013] The heat pipe condensation section is disposed in the heat exchange cavity and forms the liquid inlet end and the liquid outlet end of the heat exchange assembly; the liquid inlet end of the heat storage assembly is communicated with the liquid outlet end of the heat exchange assembly through the first pipe section, and the liquid outlet end of the heat storage assembly is communicated with the liquid inlet end of the heat exchange assembly through the second pipe section.

[0014] Optionally, fins are provided on the part of the heat pipe evaporation section located in the heat storage cavity.

[0015] Optionally, both the heat pipe evaporation section and the heat pipe condensation section are gravity heat pipes.

[0016] Optionally, the binary non-azeotropic working fluid includes a first boiling point working fluid and a second boiling point working fluid mixed therewith. The phase change temperature range of the first boiling point working fluid is 100-200°C, and the phase change temperature range of the second boiling point working fluid is 100-200°C.

[0017] Optionally, the liquid level height of the binary non-azeotropic working fluid is equal to half of the length of the heat pipe evaporation section.

[0018] Optionally, the heat storage assembly includes a container housing forming the heat storage cavity and a heat storage body disposed in the heat storage cavity. The heat storage body is a molten salt phase change energy storage material with a phase change temperature of 150-300°C.

[0019] Optionally, the heating assembly includes a heat preservation housing and an electric heater disposed in the heat preservation housing. The heat preservation housing is installed on the container housing, and one end of the heat pipe evaporation section is inserted into the heat preservation housing. The electric heater is used to heat the heat pipe evaporation section.

[0020] Optionally, the electric heater is an electric heating pipe, and the electric heating pipe is spirally wound around the heat pipe evaporation section.

[0021] Optionally, the heat preservation housing includes a housing and an inorganic heat preservation material wrapped on the housing.

[0022] Optionally, the electric heat storage device further includes a controller and a temperature sensor electrically connected to the controller. The controller is installed on the container housing and electrically connected to the electric heater, and the temperature sensor is disposed in the heat storage cavity;

[0023] The temperature sensor is used to detect the temperature signal of the heat storage body;

[0024] The controller is used to control the operation of the electric heater according to the temperature signal.

[0025] Optionally, the heat exchange assembly includes a first heat exchanger and a fan disposed on one side of the first heat exchanger. The air outlet side of the fan is correspondingly arranged at the air inlet end of the first heat exchanger.

[0026] Optionally, the heat exchange assembly further includes a second heat exchanger and a water pump connected to the second heat exchanger.

[0027] Optionally, the electric heat storage device further includes:

[0028] A first valve, installed on the first pipe section and disposed near the liquid inlet end of the heat storage assembly;

[0029] A second valve, installed on the second pipe section and disposed near the liquid outlet end of the heat storage assembly;

[0030] A third valve, installed on the second pipe section and disposed near the liquid inlet end of the first heat exchanger; and

[0031] A fourth valve, installed on the second pipe section and disposed near the liquid inlet end of the second heat exchanger.

[0032] To achieve the above object, the present invention further provides a control method for an electric heat storage device. Based on the above-described electric heat storage device, the control method for the electric heat storage device includes the following steps:

[0033] Close the first valve and the second valve;

[0034] Turn on the electric heater to heat the heat pipe evaporation section to a first preset temperature of the heat storage body.

[0035] Optionally, after the step of turning on the electric heater to heat the heat pipe evaporation section to a first preset temperature of the heat storage body, the following steps are further included:

[0036] Open the first valve, the second valve, and open the third valve and / or the fourth valve;

[0037] Open the first heat exchanger and the fan, and / or the second heat exchanger and the water pump.

[0038] In the technical solution of the present invention, the electric heat storage device includes a heat storage assembly, a pipeline assembly, and a heat exchange assembly. The heat storage assembly is provided with a heat storage cavity. The pipeline assembly is filled with a binary non-azeotropic working fluid. The heating assembly is disposed on the heat storage assembly to heat the binary non-azeotropic working fluid in the pipeline assembly. The heat exchange assembly is provided with a heat exchange cavity. The heat storage cavity is communicated with the heat exchange cavity through the pipeline assembly. It can be understood that the binary non-azeotropic working fluid can absorb heat during the heat storage period and transfer it to the heat storage assembly for storage, and absorb the stored heat of the heat storage assembly and release it externally during the heat release period, so that the heat storage and release process has high reliability and improves the heat exchange capacity of the electric heat storage device. Description of the Drawings

[0039] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0040] Figure 1 It is a schematic structural diagram of an embodiment of the electric heat storage device of the present invention;

[0041] Figure 2 It is a flowchart of an embodiment of the control method of the electric heat storage device of the present invention.

[0042] Explanation of the reference numerals in the drawings:

[0043]

[0044] The realization of the object of the present invention, functional features and advantages will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0046] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0047] In addition, the descriptions involving "first", "second", etc. in the present invention are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text is that it includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or the solution where A and B are satisfied simultaneously. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0048] Energy storage technology can solve the contradiction of the mismatch between energy supply and demand in terms of time and space, and is an effective means to improve energy utilization efficiency. Among them, electric heat storage technology is a technology that converts electric energy into heat energy and stores it using heat storage materials to solve the shortcoming that electric energy cannot be stored in large quantities, so as to be used when needed; as an important technology to improve energy utilization efficiency and protect the environment, electric heat storage can make full use of the price advantage of off-peak electricity, cut peaks and fill valleys, save operating costs, and reduce pollutant emissions. It is not only an objective need for energy utilization but also an inevitable trend for future development.

[0049] In some exemplary technologies, the electric heat storage device mainly includes a heat storage device, a heat exchanger, a control box, a temperature measuring instrument, etc. Water inlets and outlets are respectively provided at both ends of the heat exchanger. The heat storage device includes heat pipes, a heat storage body, a heat insulation layer, electric heating pipes, etc. However, this electric heat storage device has the problem of low heat exchange efficiency.

[0050] In order to improve the heat exchange capacity of the electric heat storage device, the present invention proposes an electric heat storage device, especially a heat pipe type electric heat storage device with a separated evaporation section and condensation section.

[0051] Refer to Figure 1 , in an embodiment of the present invention, the electric heat storage device includes a heat storage component 10, a pipeline component 20, a heat exchange component 30, and a heating component 40. The heat storage component 10 is provided with a heat storage cavity 10a; a binary non-azeotropic working fluid is filled in the pipeline component 20; the heating component 40 is arranged on the heat storage component 10 to heat the binary non-azeotropic working fluid in the pipeline component 20; the heat exchange component 30 is provided with a heat exchange cavity 30a, and the heat storage cavity 10a is communicated with the heat exchange cavity 30a through the pipeline component 20.

[0052] In this embodiment, refer to Figure 1 , the heat storage component 10 may include a container housing 11 and a heat storage body 12. The container housing 11 forms the above-mentioned heat storage cavity 10a for installing the heat storage body 12. The heat storage body 12 can be selected from molten salt phase change energy storage materials, especially the heat storage body 12 with a phase change temperature of 150 - 300 °C, which is not limited here.

[0053] The pipeline component 20 can be a pipeline composed of multiple branches, and the pipeline types and quantities of each branch are not limited here.

[0054] The heat exchange component 30 may include components such as a U-shaped tube type or strip tube type heat exchanger, a fan 311, a water pump 321, etc., which can realize hot air heating or hot water heating, etc., to meet various needs of different users.

[0055] It should be noted that the binary non-azeotropic working fluid is a mixture of two working fluids with different boiling points. When the pipeline assembly 20 is heated, the low-boiling working fluid in the pipeline absorbs heat and evaporates, generating a buoyancy force. The rising low-boiling working fluid gas condenses and releases heat in the pipe section located in the heat storage assembly 10, transfers the heat to the heat storage body 12, becomes a liquid, and under the action of gravity, the low-boiling working fluid liquid can flow back to the bottom of the heat pipe along the inner wall of the heat pipe; similarly, as the pipeline assembly 20 is continuously heated and the temperature gradually increases, the high-boiling working fluid begins to evaporate, generating a buoyancy force. The rising high-boiling working fluid gas condenses and releases heat in the pipe section located in the heat storage assembly 10, transfers the heat to the heat storage body 12, becomes a liquid, and under the action of gravity, the high-boiling working fluid liquid can flow back to the bottom of the heat pipe along the inner wall of the heat pipe. When the heat storage body 12 reaches thermal equilibrium with the heat exchange medium, it indicates that the heat storage process is completed. At this time, the temperature of the heat storage body 12 is lower than the phase change temperature of the high-boiling working fluid and higher than the phase change temperature of the low-boiling working fluid, making the low-boiling working fluid in a superheated gas state.

[0056] In order to achieve better heat storage and release capabilities, in the technical solution of the present invention, the binary non-azeotropic working fluid may include a first-boiling-point working fluid and a second-boiling-point working fluid mixed therewith. The phase change temperature range of the first-boiling-point working fluid may be 100-200°C; the phase change temperature range of the second-boiling-point working fluid may be 100-200°C.

[0057] It can be understood that in the present invention, by providing a heat storage cavity 10a in the heat storage assembly 10 of the electric heat storage device, the pipeline assembly 20 is filled with a binary non-azeotropic working fluid, and the heating assembly 40 is provided on the heat storage assembly 10 to heat the binary non-azeotropic working fluid in the pipeline assembly 20. The heat exchange assembly 30 is provided with a heat exchange cavity 30a. The heat storage cavity 10a is communicated with the heat exchange cavity 30a through the pipeline assembly 20. The binary non-azeotropic working fluid can absorb heat during the heat storage period and transfer it to the heat storage assembly 10 for storage, and absorb the stored heat of the heat storage assembly 10 and release it externally during the heat release period, making the heat storage and release process have high reliability and improving the heat exchange capacity of the electric heat storage device.

[0058] Please refer to Figure 1 , in an embodiment, the pipeline assembly 20 may include a heat pipe evaporation section 21, an adiabatic pipeline 22, and a heat pipe condensation section 23. The heat pipe evaporation section 21 penetrates through the heat storage cavity 10a and forms the liquid inlet end and the liquid outlet end of the heat storage assembly 10. The binary non-azeotropic working fluid is filled in the heat pipe evaporation section 21; the adiabatic pipeline 22 may include a first pipe section 221 and a second pipe section 222; the heat pipe condensation section 23 is provided in the heat exchange cavity 30a and forms the liquid inlet end and the liquid outlet end of the heat exchange assembly 30; the liquid inlet end of the heat storage assembly 10 is communicated with the liquid outlet end of the heat exchange assembly 30 through the first pipe section 221, and the liquid outlet end of the heat storage assembly 10 is communicated with the liquid inlet end of the heat exchange assembly 30 through the second pipe section 222.

[0059] In this embodiment, both the heat pipe evaporation section 21 and the heat pipe condensation section 23 can adopt gravity heat pipes, and the adiabatic pipeline 22 can adopt an adiabatic pipe. Among them, the gravity heat pipe has the advantages of fast heat transfer, small resistance, heat release and freezing resistance, and no pipe explosion.

[0060] Referring to Figure 1 , the heat pipe evaporation section 21 can penetrate through the heat storage cavity 10a along the height direction of the heat storage component 10, so that the condensate can flow back to the bottom of the heat pipe evaporation section 21 under the action of gravity, realizing recycling and further improving the heat exchange capacity of the electric heat storage device.

[0061] In order to further improve the heat storage capacity, in one embodiment, referring to Figure 1 , fins 211 can be provided on the part of the heat pipe evaporation section 21 located in the heat storage cavity 10a. The fins 211 can be arranged in a ring shape to better dissipate heat and improve the heat storage efficiency.

[0062] It is worth mentioning that in some embodiments, in order to ensure that the low-boiling point working fluid and the high-boiling point working fluid heated into gas can rise into the heat storage component 10 for heat storage, the liquid level height of the binary non-azeotropic working fluid can be set equal to half of the length of the heat pipe evaporation section 21. In this way, certain heat storage and release requirements can be met, and there is also space for gas to rise. While achieving better heat storage and release capabilities, the material cost of the binary non-azeotropic working fluid is also saved.

[0063] In one embodiment of the present invention, as Figure 1 shown, the heating component 40 can include a heat preservation housing 41 and an electric heater 42 arranged in the heat preservation housing 41. The heat preservation housing 41 is installed on the container housing 11, and one end of the heat pipe evaporation section 21 is inserted into the heat preservation housing 41. The electric heater 42 is used to heat the heat pipe evaporation section 21. In this way, the binary non-azeotropic working fluid in the heat pipe evaporation section 21 can be heated to realize liquid-vapor phase change.

[0064] In this embodiment, as Figure 1 shown, the heat preservation housing 41 can include a housing and an inorganic heat preservation material wrapped on the housing. Among them, the inorganic heat preservation material can be glass wool, etc., to ensure the stability of the heating temperature in the heat preservation housing 41 and avoid heat dissipation.

[0065] In order to improve the controllability of the electric heat storage device, in one embodiment, as Figure 1 shown, the electric heat storage device can also be provided with a temperature control component. The temperature control component can include a controller 50 and a temperature sensor 60 electrically connected to the controller 50. The controller 50 is installed on the container housing 11 and electrically connected to the electric heater 42. The temperature sensor 60 is arranged in the heat storage cavity 10a. The temperature sensor 60 is used to detect the temperature signal of the heat storage body 12. The controller 50 is used to control the operation of the electric heater 42 according to the temperature signal.

[0066] Among them, the controller 50 can be installed in the control box, the control box can be arranged outside the container housing 11, and the temperature sensor 60 can be arranged in the heat storage chamber 10a to detect the heat storage temperature of the heat storage body 12.

[0067] The controller 50 can be a microprocessor such as a single-chip microcomputer, DSP, and FPGA, etc., which is not limited here. The temperature sensor 60 can be a thermistor, etc., and no specific limitation is made here.

[0068] Please refer to Figure 1 , in some embodiments, the heat exchange assembly 30 can include a first heat exchanger 31 and a blower 311 arranged on one side of the first heat exchanger 31, and the air outlet side of the blower 311 is arranged corresponding to the air inlet end of the first heat exchanger 31. In this way, hot air heating can be realized.

[0069] In order to realize hot water heating, in some other embodiments, refer to Figure 1 , the heat exchange assembly 30 can also include a second heat exchanger 32 and a water pump 321 connected to the second heat exchanger 32.

[0070] It should be noted that the above first heat exchanger 31 can all adopt U-shaped tubes or strip tubes for heat exchange. In the embodiments of the present invention, please refer to Figure 1 , in order to expand the application range and meet the needs of different users, the combination of the first heat exchanger 31 and the second heat exchanger 32 is adopted to realize hot air circulation and hot water circulation.

[0071] In order to realize the on-off control of the pipeline assembly 20, in some embodiments, refer to Figure 1 , the electric heat storage device can also include a first valve 71, a second valve 72, a third valve 73, and a fourth valve 74. The first valve 71 is installed on the first pipe section 221 and is arranged close to the liquid inlet end of the heat storage assembly 10; the second valve 72 is installed on the second pipe section 222 and is arranged close to the liquid outlet end of the heat storage assembly 10; the third valve 73 is installed on the second pipe section 222 and is arranged close to the liquid inlet end of the first heat exchanger 31; the fourth valve 74 is installed on the second pipe section 222 and is arranged close to the liquid inlet end of the second heat exchanger 32.

[0072] Among them, the first valve 71 is used to control the on-off of the liquid inlet end of the heat storage assembly 10, the second valve 72 is used to control the on-off of the liquid outlet end of the heat storage assembly 10, the third valve 73 is used to control the on-off of the liquid inlet end of the first heat exchanger 31, and the fourth valve 74 is used to control the on-off of the liquid inlet end of the second heat exchanger 32. In this way, the controllability and stability of the electric heat storage device are further improved.

[0073] The present invention also proposes a control method for an electric heat storage device, and the control method of the electric heat storage device is based on the above-mentioned electric heat storage device. Please refer to Figure 2, in an embodiment of the present invention, the control method of the electric heat storage device includes the following steps:

[0074] S10, close the first valve and the second valve;

[0075] S20, turn on the electric heater to heat the evaporation section of the heat pipe until the heat storage body reaches a first preset temperature.

[0076] When the electric heat storage device is in the heat storage period, the first valve 71 and the second valve 72 are in the closed state, and all the heat exchange medium in the heat pipe enters the evaporation section 21 of the heat pipe; the electric heater 42 is powered on for heating, and the low-boiling-point working medium in the evaporation section 21 of the heat pipe absorbs heat and evaporates, generating a buoyancy force. The rising low-boiling-point working medium gas condenses and releases heat in the pipe section located in the heat storage assembly 10, transferring the heat to the heat storage body 12. The low-boiling-point working medium that becomes liquid flows back to the bottom of the pipe along the inner wall of the heat pipe under the action of gravity; as the electric heater 42 continues to heat, the temperature of the evaporation section 21 of the heat pipe gradually rises, and the high-boiling-point working medium begins to evaporate, and transfers heat to the heat storage body 12 in the same way as the low-boiling-point working medium. When the heat storage body 12 reaches thermal equilibrium with the heat exchange medium, it means that the heat storage process is completed. At this time, the temperature of the heat storage body 12 (i.e., the first preset temperature) is lower than the phase change temperature of the high-boiling-point working medium and higher than the phase change temperature of the low-boiling-point working medium, making the low-boiling-point working medium in a superheated gas state.

[0077] Further, please refer to Figure 2 , after the step of turning on the electric heater to heat the evaporation section of the heat pipe until the heat storage body reaches a first preset temperature, the following steps may further be included:

[0078] S30, open the first valve, the second valve, and open the third valve and / or the fourth valve;

[0079] S40, turn on the first heat exchanger and the fan, and / or the second heat exchanger and the water pump.

[0080] When the electric heat storage device is in the heat release period, open the first valve 71, the second valve 72, and open the third valve 73 and / or the fourth valve 74. The superheated low-boiling-point working medium gas in the evaporation section 21 of the heat pipe relies on the buoyancy force to enter the heat exchange assembly 30 through the adiabatic pipeline 22, releases heat and condenses into a liquid in the condensation section 23 of the heat pipe located in the heat exchange assembly 30. The condensate returns to the evaporation section 21 of the heat pipe under the action of gravity, and the low-boiling-point working medium continuously absorbs the heat of the heat storage body 12 and evaporates, finally releasing all the stored heat in the heat storage body 12, that is, completing the heat release process.

[0081] It should be noted that in the heat exchange component 30, heat can be extracted either by the blower 311 sucking hot air or by the water pump 321 circulating water; by controlling the opening and closing of the third valve 73 and the fourth valve 74, both heat extraction modes can be operated simultaneously, or one of the heat extraction modes can be selected for independent operation.

[0082] The above are only optional embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. An electric heat storage device, characterized in that, The electric heat storage device includes: A heat storage component provided with a heat storage cavity. The heat storage component includes a container housing forming the heat storage cavity and a heat storage body disposed in the heat storage cavity; A pipeline component filled with a binary non-azeotropic working fluid, which includes a first boiling point working fluid and a second boiling point working fluid mixed therewith; A heating component; and A heat exchange component provided with a heat exchange cavity. The heat storage cavity is communicated with the heat exchange cavity through the pipeline component; The pipeline component includes: A heat pipe evaporation section penetrating through the heat storage cavity and forming the liquid inlet end and the liquid outlet end of the heat storage component. The binary non-azeotropic working fluid is filled in the heat pipe evaporation section; An adiabatic pipeline including a first pipe section and a second pipe section; and A heat pipe condensation section disposed in the heat exchange cavity and forming the liquid inlet end and the liquid outlet end of the heat exchange component. The liquid inlet end of the heat storage component is communicated with the liquid outlet end of the heat exchange component through the first pipe section, and the liquid outlet end of the heat storage component is communicated with the liquid inlet end of the heat exchange component through the second pipe section; The heating component includes a heat preservation housing and an electric heater disposed in the heat preservation housing. The heat preservation housing is installed on the container housing. One end of the heat pipe evaporation section is inserted into the heat preservation housing, and the other end of the heat pipe evaporation section is inserted into the container housing. The electric heater is used for heating the heat pipe evaporation section of the heat preservation housing; When the heat storage body reaches thermal equilibrium with the heat exchange medium, the temperature of the heat storage body is lower than the phase change temperature of the first boiling point working fluid and higher than the phase change temperature of the second boiling point working fluid.

2. The electric heat storage device according to claim 1, characterized in that Fins are provided on the part of the heat pipe evaporation section located in the heat storage cavity.

3. The electric heat storage device according to claim 1, wherein, Both the heat pipe evaporation section and the heat pipe condensation section are gravity heat pipes.

4. The electric heat storage device according to claim 1, wherein, The phase change temperature range of the first boiling point working fluid is 100-200 °C, and the phase change temperature range of the second boiling point working fluid is 100-200 °C.

5. The electric heat storage device according to claim 4, characterized in that, The liquid level height of the binary non-azeotropic working fluid is equal to half of the length of the heat pipe evaporation section.

6. The electric heat storage device according to claim 1, characterized in that The heat storage body is a molten salt phase change energy storage material with a phase change temperature of 150-300 °C.

7. The electric heat storage device according to claim 1, characterized in that, The electric heater is an electric heating pipe, and the electric heating pipe is spirally wound around the heat pipe evaporation section.

8. The electric heat storage device according to claim 1, characterized in that, The heat preservation housing includes a housing and an inorganic heat preservation material wrapped on the housing.

9. The electric heat storage device according to claim 1, characterized in that, The electric heat storage device further includes a controller and a temperature sensor electrically connected to the controller. The controller is installed on the container housing and electrically connected to the electric heater, and the temperature sensor is disposed in the heat storage cavity; The temperature sensor is used for detecting the temperature signal of the heat storage body; The controller is used for controlling the electric heater to work according to the temperature signal.

10. The electric heat storage device according to claim 9, characterized in that, The heat exchange component includes a first heat exchanger and a fan disposed on one side of the first heat exchanger. The air outlet side of the fan is correspondingly arranged at the air inlet end of the first heat exchanger.

11. The electric heat storage device according to claim 10, wherein, The heat exchange component further includes a second heat exchanger and a water pump connected to the second heat exchanger.

12. The electric heat storage device according to claim 11, characterized in that, The electric heat storage device further includes: A first valve installed on the first pipe section and close to the liquid inlet end of the heat storage component; A second valve installed on the second pipe section and close to the liquid outlet end of the heat storage component; A third valve, installed on the second pipe section and disposed near the liquid inlet end of the first heat exchanger; and A fourth valve, installed on the second pipe section and disposed near the liquid inlet end of the second heat exchanger.

13. A control method for an electric heat storage device, based on the electric heat storage device as described in claim 12, characterized in that, The control method of the electric heat storage device includes the following steps: Closing the first valve and the second valve; Turning on the electric heater to heat the heat pipe evaporation section until the heat storage body reaches a first preset temperature; wherein, when the heat storage body reaches thermal equilibrium with the heat exchange medium, the first preset temperature is lower than the phase change temperature of the first boiling point working medium and higher than the phase change temperature of the second boiling point working medium.

14. The control method of the electric heat storage device according to claim 13, characterized in that, After the step of turning on the electric heater to heat the heat pipe evaporation section until the heat storage body reaches a first preset temperature, the method further includes: Opening the first valve, the second valve, and opening the third valve and / or the fourth valve; Turning on the first heat exchanger and the fan, and / or the second heat exchanger and the water pump.

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