Carnot battery energy storage system coupled with solar heat pump and energy storage power generation method

Abstract

The invention discloses a Carnot battery energy storage system coupled with a solar heat pump, which comprises a heat pump circulating unit, a heat storage unit and an organic Rankine cycle unit, the heat pump circulating unit comprises a solar heat collector and a photovoltaic and photo-thermal integrated device, and is used as a low-temperature heat source and a driving heat source of the heat pump circulating unit; the heat pump cycle unit is connected with the heat storage unit and used for storing heat energy in the heat storage unit, and the heat storage unit is connected with the organic Rankine cycle unit and used for converting the heat energy into electric energy. The device has the advantages that the structure is simple, full-spectrum utilization of solar energy is achieved, photoelectric efficiency is high, and energy supply and demand are matched in time and space. The invention further discloses an energy storage and power generation method of the Carnot battery energy storage system coupled with the solar heat pump.

Description

Technical Field

[0001] This invention relates to the field of energy storage technology, specifically to a Carnot battery energy storage system coupled with a solar heat pump and an energy storage and power generation method. Background Technology

[0002] Solar energy, as a clean and renewable energy source, plays a crucial role in the global energy transition. Solar energy utilization is mainly divided into two pathways: photovoltaic (PV) power generation and solar thermal (CTP) collection. While PV technology has developed rapidly, its output power is significantly affected by solar irradiance, exhibiting inherent fluctuations and intermittency. This leads to unstable power generation, supply-demand mismatch, and frequent curtailment, severely restricting grid integration and large-scale application. Solar thermal collection technology, particularly parabolic trough (PTC) collectors, demonstrates high efficiency in industrial heating and power generation, but its long-distance heat transfer capability is limited, and it is affected by seasonal load demand, making it difficult to achieve stable and large-scale energy supply.

[0003] In recent years, photovoltaic / solar thermal integration (PV / T) technology has gradually emerged. This technology combines photovoltaic power generation with solar thermal collection, enabling the simultaneous utilization of both short-wave and long-wave energy of sunlight, thus improving the overall utilization rate of solar energy. However, PV / T systems have not yet completely solved the problem of the mismatch between energy supply and demand in time and space. Especially in the absence of economical and efficient long-term energy storage technology, the overall efficiency and reliability of solar energy systems are difficult to achieve a fundamental breakthrough.

[0004] To address these challenges, absorption heat pumps and Carnot battery energy storage technologies have received widespread attention in recent years. Absorption heat pumps can efficiently utilize low-grade heat energy, achieving cascaded utilization and temperature enhancement, which helps improve the energy utilization efficiency of solar thermal collector systems. Carnot battery energy storage technology, through the mutual conversion between heat energy and electrical energy, provides a low-cost, long-life, and environmentally friendly long-term energy storage solution, particularly suitable for mitigating power fluctuations in renewable energy sources and enabling time-shifted energy applications. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a Carnot battery energy storage system that is simple in structure, realizes full-spectrum utilization of solar energy, has high photoelectric efficiency, and matches energy supply and demand in time and space.

[0006] The present invention further provides an energy storage and power generation method for a Carnot battery energy storage system coupled with a solar heat pump.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A Carnot battery energy storage system coupled with a solar heat pump includes a heat pump cycle unit, a thermal storage unit, and an organic Rankine cycle unit. The heat pump cycle unit includes a solar collector and a photovoltaic-thermal integrated device, which serve as the low-temperature heat source and driving heat source of the heat pump cycle unit. The heat pump cycle unit is connected to the thermal storage unit for storing thermal energy. The thermal storage unit is connected to the organic Rankine cycle unit for converting thermal energy into electrical energy.

[0008] As a further improvement to the above technical solution: the heat pump cycle unit includes a generator, a first condenser, a first evaporator, an absorber, and a heat exchanger. The solar collector is connected in series with the medium side of the generator to form a loop. The photovoltaic-thermal integrated device is connected in series with the medium side of the first evaporator to form a loop. The working fluid side of the generator, the medium side of the first condenser, the working fluid side of the first evaporator, the medium side of the absorber, and the working fluid side of the heat exchanger are sequentially connected to form a loop. The working fluid sides of the first condenser and the absorber are connected to the heat storage unit for storing thermal energy in the heat storage unit.

[0009] As a further improvement to the above technical solution: the heat pump circulation unit further includes a regenerative pump, and the generator, the regenerative pump, the regenerative side of the heat exchanger and the medium side of the absorber are connected in sequence to form a regenerative branch.

[0010] As a further improvement to the above technical solution: the photovoltaic-thermal integrated device is connected to the heat recovery pump to provide power to the heat recovery pump.

[0011] As a further improvement to the above technical solution: the thermal storage unit includes a low-temperature storage tank, a high-temperature storage tank, a third on-off valve and a fourth on-off valve, and the organic Rankine cycle unit includes a second evaporator. The low-temperature storage tank, the fourth on-off valve, the working fluid side of the first condenser, the working fluid side of the absorber, the high-temperature storage tank, the third on-off valve and the medium side of the second evaporator are connected in sequence to form a loop.

[0012] As a further improvement to the above technical solution: the photovoltaic-thermal integrated device is connected to the high-temperature storage tank to provide power to the high-temperature storage tank.

[0013] As a further improvement to the above technical solution: the organic Rankine cycle unit further includes an expander, a regenerator, a second condenser, and a cooling tower. The working fluid side of the second condenser, the working fluid side of the regenerator, the working fluid side of the second evaporator, the expander, and the medium side of the regenerator are sequentially connected to form a loop. The outlet of the cooling tower is connected to the medium inlet of the second condenser.

[0014] As a further improvement to the above technical solution: a throttling valve is provided between the first condenser and the first evaporator, a second on / off valve is provided between the heat exchanger and the generator, a circulating pump is provided between the second condenser and the regenerator, and the photovoltaic-thermal integrated device is connected to the circulating pump to provide power to the circulating pump.

[0015] As a further improvement to the above technical solution: the solar collector is a PTC, the outlet heat collection medium temperature of the solar collector is 150-250℃, and the outlet heat collection medium temperature of the photovoltaic-thermal integrated device is 30-60℃. The working fluid of the heat pump circulation unit is lithium bromide solution, and the working fluid of the organic Rankine cycle unit is R1233zd(E).

[0016] A method for energy storage and power generation of a Carnot battery energy storage system coupled with a solar heat pump, including energy storage state and power generation state; Energy storage status: When solar energy is abundant, the solar collector absorbs solar energy and transfers the heat to the circulating working fluid in the generator. The water in the circulating working fluid absorbs heat and evaporates into water vapor, which then enters the first condenser. After releasing heat and condensing, it enters the first evaporator after being throttled by the expansion valve. The photovoltaic-thermal integrated device absorbs solar energy and transfers energy to liquid water in the first evaporator. The liquid water absorbs heat and evaporates, which then enters the absorber. At the same time, the circulating working fluid in the generator becomes a concentrated solution and is pressurized by the regenerative pump before entering the heat exchanger. Then, it enters the absorber together with the water vapor in the first evaporator. After mixing and releasing heat, it enters the heat exchanger and then returns to the generator through the second on / off valve. When the fourth on / off valve is opened and the third on / off valve is closed, the heat storage medium in the low-temperature storage tank enters the first condenser and the absorber in sequence to absorb the heat released by the condensation of water vapor and the mixing of the circulating working fluid to form a high-temperature heat storage medium, which then enters the high-temperature storage tank for storage. Power generation status: When solar energy is insufficient and it is during peak electricity consumption periods, the third on / off valve is opened and the fourth on / off valve is closed, and the organic Rankine cycle unit starts to operate. The low-temperature, low-pressure saturated liquid working fluid is pressurized by the circulating pump and enters the regenerator. After absorbing heat, it enters the second evaporator to exchange heat with the high-temperature heat storage medium from the high-temperature storage tank. After evaporation, it enters the expander to expand and perform work. After the temperature and pressure of the liquid working fluid decrease, it enters the regenerator to release heat. Then it enters the second condenser and is condensed by the cooling water in the cooling tower to become a low-temperature, low-pressure saturated liquid working fluid, thus completing the organic Rankine cycle.

[0017] Compared with the prior art, the advantages of the present invention are as follows: First, the Carnot battery energy storage system coupled with a solar heat pump disclosed in this invention is achieved by coupling a heat storage unit with a heat pump cycle unit and an organic Rankine cycle unit. This allows the high-grade heat energy generated by the heat pump cycle unit to be stored in the heat storage unit. When solar energy is insufficient and it is during peak electricity consumption periods, the heat storage unit provides heat to the organic Rankine cycle unit to generate electricity, thus solving the problem of mismatch between energy supply and demand in time and space in the prior art.

[0018] Secondly, the Carnot battery energy storage system for coupled solar heat pump disclosed in this invention uses a solar collector and a photovoltaic-thermal integrated device to make solar energy serve as the low-temperature heat source and driving heat source for the heat pump cycle, respectively. At the same time, the surface temperature of the photovoltaic-thermal integrated device decreases, realizing the cascade utilization of thermal energy, thereby improving the photoelectric efficiency and significantly enhancing the overall utilization efficiency of solar energy.

[0019] Third, the Carnot battery energy storage system coupled with a solar heat pump disclosed in this invention has a simple structure, can be retrofitted onto existing solar power plants with minimal facility modifications, and has low cost. Furthermore, it can be used in distributed energy sources such as industrial parks, isolated grid areas, or microgrids to provide a stable power supply and improve energy self-sufficiency.

[0020] Fourth, the energy storage and power generation method of the Carnot battery energy storage system coupled with a solar heat pump disclosed in this invention has all the advantages of the Carnot battery energy storage system coupled with a solar heat pump. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a Carnot battery energy storage system coupled with a solar heat pump according to the present invention.

[0022] The labels in the diagram represent: 1. Generator; 2. First condenser; 3. Throttling valve; 4. First evaporator; 5. Absorber; 6. Heat exchanger; 7. Second on / off valve; 8. Regenerative pump; 9. Solar collector; 10. Photovoltaic-thermal integrated device; 11. High-temperature storage tank; 12. Third on / off valve; 13. Second evaporator; 14. Expander; 15. Regenerator; 16. Second condenser; 17. Cooling tower; 18. Low-temperature storage tank; 19. Fourth on / off valve; 20. Circulating pump. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0026] In this invention, unless otherwise explicitly specified and limited, the terms "assembly," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] Figure 1 An embodiment of a Carnot battery energy storage system coupled with a solar heat pump is shown. The overall system can be divided into three parts: a heat pump cycle unit, a thermal storage unit, and an organic Rankine cycle unit. The heat pump cycle unit includes a solar collector 9 and a photovoltaic-thermal integrated device 10, which serve as the low-temperature heat source and driving heat source of the heat pump cycle unit. The heat pump cycle unit is connected to the thermal storage unit to store thermal energy. The thermal storage unit is connected to the organic Rankine cycle unit to convert thermal energy into electrical energy.

[0029] In this embodiment, the heat pump circulation unit includes a generator 1, a first condenser 2, a first evaporator 4, an absorber 5, and a heat exchanger 6. The solar collector 9 is connected in series with the medium side of the generator 1 to form a loop. The photovoltaic-thermal integrated device 10 is connected in series with the medium side of the first evaporator 4 to form a loop. The working fluid side of the generator 1, the medium side of the first condenser 2, the working fluid side of the first evaporator 4, the medium side of the absorber 5, and the working fluid side of the heat exchanger 6 are connected in sequence to form a loop. The working fluid sides of the first condenser 2 and the absorber 5 are connected to the heat storage unit to store thermal energy in the heat storage unit.

[0030] In this embodiment, the heat pump cycle unit also includes a regenerative heat pump 8. The generator 1, the regenerative heat pump 8, the regenerative side of the heat exchanger 6 and the medium side of the absorber 5 are connected in sequence to form a regenerative branch.

[0031] In this embodiment, the photovoltaic-thermal integrated device 10 is connected to the heat pump 8 to provide power to the heat pump 8.

[0032] In this embodiment, the heat storage unit includes a low-temperature storage tank 18, a high-temperature storage tank 11, a third on / off valve 12, and a fourth on / off valve 19. The organic Rankine cycle unit includes a second evaporator 13. The low-temperature storage tank 18, the fourth on / off valve 19, the working fluid side of the first condenser 2, the working fluid side of the absorber 5, the high-temperature storage tank 11, the third on / off valve 12, and the medium side of the second evaporator 13 are sequentially connected to form a loop.

[0033] In this embodiment, the photovoltaic-thermal integrated device 10 is connected to the high-temperature storage tank 11 to provide electrical energy to the high-temperature storage tank 11.

[0034] In this embodiment, the organic Rankine cycle unit further includes an expander 14, a regenerator 15, a second condenser 16, and a cooling tower 17. The working fluid side of the second condenser 16, the working fluid side of the regenerator 15, the working fluid side of the second evaporator 13, the medium side of the expander 14 and the regenerator 15 are sequentially connected to form a loop. The outlet of the cooling tower 17 is connected to the medium inlet of the second condenser 16.

[0035] In this embodiment, a throttling valve 3 is provided between the first condenser 2 and the first evaporator 4, a second on / off valve 7 is provided between the heat exchanger 6 and the generator 1, a circulating pump 20 is provided between the second condenser 16 and the regenerator 15, and a photovoltaic-thermal integrated device 10 is connected to the circulating pump 20 to provide power to the circulating pump 20.

[0036] In this embodiment, the solar collector 9 is a PTC, the outlet heat collection medium temperature of the solar collector 9 is 150-250℃, and the outlet heat collection medium temperature of the photovoltaic-thermal integrated device 10 is 30-60℃. The working fluid of the heat pump cycle unit is lithium bromide solution, and the working fluid of the organic Rankine cycle unit is R1233zd(E).

[0037] In the heat pump cycle unit, the circulating working fluid absorbs the heat energy provided by the solar collector 9 in the generator 1. After the water in the circulating working fluid absorbs heat and evaporates, it enters the first condenser 2 and condenses into liquid water. The liquid water that has released heat and condensed passes through the throttle valve 3 and enters the first evaporator 4. At this time, the light energy collected by the photovoltaic-thermal integrated device 10 is converted into heat energy to provide heat energy for the liquid water in the first evaporator 4, so that it absorbs heat and evaporates before entering the absorber 5. At the same time, the concentrated solution of the circulating working fluid in the generator 1 is pressurized by the regenerative pump 8 and transported to the heat exchanger 6. It enters the absorber 5 together with the water vapor in the first evaporator 4 to mix as the circulating working fluid and release heat before entering the heat exchanger 6 to further release heat. Then it returns to the generator 1 to realize the heat pump cycle.

[0038] In the thermal storage unit, during heat pump circulation, the fourth on / off valve 19 is opened and the third on / off valve 12 is closed. The low-temperature thermal storage medium in the low-temperature storage tank 18 sequentially enters the first condenser 2 and absorber 5 to absorb the heat released by water vapor condensation and solution mixing, causing the low-temperature thermal storage medium to heat up before entering the high-temperature storage tank 11. The photovoltaic-thermal integrated device 10 provides electricity to the high-temperature storage tank 11 to heat it. Through this special design, the heat generated by the heat pump circulation is collected and stored in the high-temperature storage tank 11. When electricity is needed, the fourth on / off valve 19 is closed and the third on / off valve 12 is opened, converting thermal energy into electrical energy through heat exchange with the high-temperature thermal storage medium in the high-temperature storage tank 11.

[0039] In the organic Rankine cycle, when solar energy is insufficient and it is during peak electricity consumption periods, the fourth on / off valve 19 is closed and the third on / off valve 12 is opened. The low-temperature, low-pressure saturated liquid working fluid is pressurized by the circulating pump 20 and enters the regenerator 15 to absorb heat. Then it enters the second evaporator 13 to exchange heat with the high-temperature heat storage medium from the high-temperature storage tank 11. After evaporation, it enters the expander 14 to expand and perform work. After the temperature and pressure of the liquid working fluid decrease, it enters the regenerator 15 to release heat. Finally, it enters the second condenser 16 and is condensed by the cooling water from the cooling tower 17 to a low-temperature, low-pressure saturated liquid state, completing the organic Rankine cycle and converting thermal energy into electrical energy to smooth grid fluctuations.

[0040] The energy storage and power generation method of the Carnot battery energy storage system coupled with a solar heat pump of the present invention includes an energy storage state and a power generation state. Energy storage status: When solar energy is sufficient, solar collector 9 absorbs solar energy and transfers the heat to the circulating working fluid in generator 1. The water in the circulating working fluid absorbs heat and evaporates into water vapor, which then enters the first condenser 2. After releasing heat and condensing, it enters the first evaporator 4 after being throttled by throttling valve 3. The photovoltaic-thermal integrated device 10 absorbs solar energy and transfers the energy to liquid water in the first evaporator 4. After the liquid water absorbs heat and evaporates, it enters the absorber 5. At the same time, the circulating working fluid in generator 1 becomes a concentrated solution and is pressurized by heat recovery pump 8 before entering heat exchanger 6. Then, it enters the absorber 5 together with the water vapor in the first evaporator 4. After mixing and releasing heat, it enters the heat exchanger 6 and then returns to generator 1 through the second on / off valve 7. The fourth on / off valve 19 is opened and the third on / off valve 12 is closed. The heat storage medium in the low-temperature storage tank 18 enters the first condenser 2 and absorber 5 in sequence to absorb the heat released by the condensation of water vapor and the mixing of the circulating working fluid to form a high-temperature heat storage medium, which enters the high-temperature storage tank 11 for storage. Power generation status: When solar energy is insufficient and it is during peak electricity consumption periods, the third on / off valve 12 is opened and the fourth on / off valve 19 is closed, and the organic Rankine cycle unit starts to operate. The low-temperature, low-pressure saturated liquid working fluid is pressurized by the circulating pump 20 and enters the regenerator 15. After absorbing heat, it enters the second evaporator 13 to exchange heat with the high-temperature heat storage medium from the high-temperature storage tank 11. After evaporation, it enters the expander 14 to expand and perform work. After the temperature and pressure of the liquid working fluid decrease, it enters the regenerator 15 to release heat, and then enters the second condenser 16 to be condensed by the cooling water in the cooling tower 17 to a low-temperature, low-pressure saturated liquid working fluid, thus completing the organic Rankine cycle.

[0041] By switching between energy storage and power generation modes by closing or opening specific valves, the system activates energy storage mode during periods of abundant solar energy and low electricity demand, and power generation mode during periods of insufficient solar energy and high electricity demand. By converting the heat generated during system operation into electrical energy, the system effectively avoids solar curtailment, smooths load fluctuations, and enhances grid stability. By utilizing different devices to use solar energy as both a low-temperature heat source and a driving heat source for the heat pump, the system improves photovoltaic efficiency and significantly enhances the overall efficiency of solar energy utilization.

[0042] The present invention has the following advantages: This invention utilizes a heat pump cycle unit, a thermal storage unit, and an organic Rankine cycle unit operating simultaneously. The solar collector 9 collects light energy, which is converted into heat energy and transferred to the circulating working fluid within the heat pump cycle unit. The photovoltaic-thermal integrated device 10 collects light energy, which is partly converted into heat energy to provide evaporation heat to the first evaporator 4, and partly converted into electricity to provide heating power to the high-temperature storage tank 11, as well as driving power for the heat pump cycle unit and the organic Rankine cycle unit. Simultaneously, the surface temperature of the photovoltaic-thermal integrated device 10 decreases. By using different devices to utilize solar energy as both a low-temperature heat source and a driving heat source for the heat pump cycle, a cascaded utilization of thermal energy is achieved. Furthermore, the decrease in the surface temperature of the photovoltaic-thermal integrated device 10 improves photoelectric efficiency and significantly enhances the overall efficiency of solar energy utilization. The cryogenic storage tank 18 is connected to the heat pump operating circuit to absorb heat and heat the cryogenic thermal storage medium, which is then passed into the high-temperature storage tank 11 for storage. By setting up the high-temperature storage tank 11 and the cryogenic storage tank 18 to store and release thermal energy, the organic Rankine cycle unit is connected to the high-temperature storage tank 11 through the second evaporator 13 to convert the thermal energy in the high-temperature storage tank 11 into electrical energy, solving the problem of time mismatch between power generation and load. When the light intensity is strong, the absorbed light energy is converted into heat energy and stored in the thermal storage unit. When the light intensity is weak and the power demand is high, the stored heat energy is converted into electrical energy, so that the energy supply and demand are matched in time and space. This effectively avoids the problem of curtailment of solar power, smooths load fluctuations, and enhances the stability of the power grid.

[0043] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the present invention, should fall within the protection scope of the present invention.

Claims

1. A Carnot battery energy storage system coupled with a solar heat pump, characterized in that: It includes a heat pump cycle unit, a heat storage unit and an organic Rankine cycle unit. The heat pump cycle unit includes a solar collector (9) and a photovoltaic-thermal integrated device (10) as the low-temperature heat source and driving heat source of the heat pump cycle unit. The heat pump cycle unit is connected to the heat storage unit for storing thermal energy in the heat storage unit. The heat storage unit is connected to the organic Rankine cycle unit for converting thermal energy into electrical energy.

2. The Carnot battery energy storage system coupled with a solar heat pump according to claim 1, characterized in that: The heat pump cycle unit includes a generator (1), a first condenser (2), a first evaporator (4), an absorber (5), and a heat exchanger (6). The solar collector (9) is connected in series with the medium side of the generator (1) to form a loop. The photovoltaic-thermal integrated device (10) is connected in series with the medium side of the first evaporator (4) to form a loop. The working fluid side of the generator (1), the medium side of the first condenser (2), the working fluid side of the first evaporator (4), the medium side of the absorber (5), and the working fluid side of the heat exchanger (6) are connected in sequence to form a loop. The working fluid sides of the first condenser (2) and the absorber (5) are connected to the heat storage unit to store thermal energy in the heat storage unit.

3. The Carnot battery energy storage system coupled with a solar heat pump according to claim 2, characterized in that: The heat pump circulation unit also includes a regenerative pump (8), and the regenerative side of the generator (1), the regenerative pump (8), the heat exchanger (6), and the medium side of the absorber (5) are connected in sequence to form a regenerative branch.

4. The Carnot battery energy storage system coupled with a solar heat pump according to claim 3, characterized in that: The photovoltaic-thermal integrated device (10) is connected to the heat pump (8) and is used to provide electrical energy to the heat pump (8).

5. The Carnot battery energy storage system coupled with a solar heat pump according to claim 2, characterized in that: The heat storage unit includes a low-temperature storage tank (18), a high-temperature storage tank (11), a third on / off valve (12), and a fourth on / off valve (19). The organic Rankine cycle unit includes a second evaporator (13). The low-temperature storage tank (18), the fourth on / off valve (19), the working fluid side of the first condenser (2), the working fluid side of the absorber (5), the high-temperature storage tank (11), the third on / off valve (12), and the medium side of the second evaporator (13) are sequentially connected to form a loop.

6. The Carnot battery energy storage system coupled with a solar heat pump according to claim 5, characterized in that: The photovoltaic-thermal integrated device (10) is connected to the high-temperature storage tank (11) and is used to provide electrical energy to the high-temperature storage tank (11).

7. The Carnot battery energy storage system coupled with a solar heat pump according to claim 5, characterized in that: The organic Rankine cycle unit also includes an expander (14), a regenerator (15), a second condenser (16), and a cooling tower (17). The working fluid side of the second condenser (16), the working fluid side of the regenerator (15), the working fluid side of the second evaporator (13), the medium side of the expander (14), and the medium side of the regenerator (15) are connected in sequence to form a loop. The outlet of the cooling tower (17) is connected to the medium inlet of the second condenser (16).

8. The Carnot battery energy storage system coupled with a solar heat pump according to claim 7, characterized in that: A throttling valve (3) is provided between the first condenser (2) and the first evaporator (4), a second on / off valve (7) is provided between the heat exchanger (6) and the generator (1), a circulating pump (20) is provided between the second condenser (16) and the regenerator (15), and the photovoltaic-thermal integrated device (10) is connected to the circulating pump (20) to provide power to the circulating pump (20).

9. A Carnot battery energy storage system coupled with a solar heat pump according to any one of claims 1 to 8, characterized in that: The solar collector (9) is a PTC, the outlet heat collection medium temperature of the solar collector (9) is 150-250℃, and the outlet heat collection medium temperature of the photovoltaic-thermal integrated device (10) is 30-60℃. The working fluid of the heat pump circulation unit is lithium bromide solution, and the working fluid of the organic Rankine cycle unit is R1233zd(E).

10. A method for energy storage and power generation of a Carnot battery energy storage system coupled with a solar heat pump as described in any one of claims 1 to 9, characterized in that: Including energy storage status and power generation status; Energy storage status: When solar energy is sufficient, the solar collector (9) absorbs solar energy and transfers the heat to the circulating working fluid in the generator (1). The water in the circulating working fluid absorbs heat and evaporates into water vapor, which then enters the first condenser (2). After releasing heat and condensing, it enters the first evaporator (4) after being throttled by the throttling valve (3). The photovoltaic-thermal integrated device (10) absorbs solar energy and transfers the energy to liquid water in the first evaporator (4). After the liquid water absorbs heat and evaporates, it enters the absorber (5). At the same time, the circulating working fluid in the generator (1) becomes a concentrated solution and passes through the heat recovery pump. (8) Pressurized and enters heat exchanger (6), then enters absorber (5) together with water vapor in first evaporator (4), mixes and releases heat and enters heat exchanger (6), then returns to generator (1) through second on / off valve (7); open fourth on / off valve (19), close third on / off valve (12), the heat storage medium in low temperature storage tank (18) enters first condenser (2) and absorber (5) in sequence to absorb the heat released by water vapor condensation and mixing with circulating working fluid to form high temperature heat storage medium which enters high temperature storage tank (11) for storage; Power generation status: When solar energy is insufficient and it is during peak electricity consumption period, the third on / off valve (12) is opened and the fourth on / off valve (19) is closed. The organic Rankine cycle unit starts to operate. The low-temperature and low-pressure saturated liquid working fluid is pressurized by the circulating pump (20) and enters the regenerator (15). After absorbing heat, it enters the second evaporator (13) to exchange heat with the high-temperature heat storage medium from the high-temperature storage tank (11). After evaporation, it enters the expander (14) to expand and work. After the temperature and pressure of the liquid working fluid decrease, it enters the regenerator (15) to release heat. Then it enters the second condenser (16) and is condensed by the cooling water in the cooling tower (17) to the low-temperature and low-pressure saturated liquid working fluid, thus completing the organic Rankine cycle.

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