Geothermal-based battery integration system

Abstract

The present application provides a battery integration system based on geothermal energy, including: a heat storage layer; a heat extraction device, which is placed in the heat storage layer, and the heat extraction device is provided with a working fluid inlet and a heat source outlet, and the working fluid inlet is suitable for passing the working fluid to exchange heat with the heat extraction device and generate a constant temperature difference; an in-situ power generation subsystem, which is arranged on the heat extraction device to generate electricity using the constant temperature difference; at least one level of ground power generation subsystem, which is provided with a heat energy inlet and a heat energy outlet, and the heat energy inlet is connected to the heat extraction device to obtain the heat source of the heat extraction device and generate electricity, and the ground power generation subsystem is placed in a cold source environment, and the heat energy outlet of the ground power generation subsystem is connected to the working fluid inlet so that the working fluid with a reduced temperature after power generation returns to the heat extraction device. By setting the in-situ power generation subsystem in the constant temperature gradient layer of the heat storage layer, and using the phase change of the working fluid to reduce the temperature to form a constant temperature difference, an enhanced geothermal battery can be obtained, which improves the utilization efficiency and power generation efficiency of geothermal energy.

Description

Technical Field

[0001] The present invention relates to the technical field of geothermal power generation, and in particular to a battery integration system based on geothermal energy. Background Art

[0002] Medium-deep geothermal energy is a potential clean energy source. The current heat utilization method is to take the underground heat to the surface through a heat exchange device, and then generate electricity or directly provide heat through power components such as steam turbines. Whether it is a medium-deep casing or a heat pipe, the unit heat extraction generally does not exceed 150W / m, the heat extraction efficiency is low, and the heat extraction process is the process of converting high-grade thermal energy into low-grade thermal energy. Medium and low temperature geothermal power generation technology is mainly based on secondary energy conversion, which is a great waste of thermal energy. In addition, the process of converting thermal energy into mechanical energy and then into electrical energy has a low thermoelectric conversion efficiency, generally not exceeding 20%, with large heat losses, high maintenance costs, and low power generation efficiency, resulting in a great waste of energy.

[0003] In the related existing technologies, the utilization of medium and low temperature geothermal energy is mainly for heating, and no battery system has been formed. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the prior art geothermal power generation that uses energy conversion resulting in low power generation efficiency and no battery system, thereby providing a battery integration system based on geothermal energy that has high power generation consumption and can directly provide power supply.

[0005] In order to solve the above technical problems, the present invention provides a battery integration system based on geothermal energy, comprising: a heat storage layer, arranged underground; a heat extraction device, arranged in the heat storage layer, the heat extraction device is provided with a working fluid inlet and a heat source outlet, the working fluid inlet is suitable for passing a working fluid to exchange heat with the heat extraction device and generate a constant temperature difference; an in-situ power generation subsystem, arranged on the heat extraction device to generate electricity using the constant temperature difference; at least one level of ground power generation subsystem, provided with a heat energy inlet and a heat energy outlet, the heat energy inlet is connected to the heat extraction device to obtain the heat source of the heat extraction device and generate electricity, the ground power generation subsystem is placed in a cold source environment, and the heat energy outlet of the ground power generation subsystem is connected to the working fluid inlet so that the working fluid with a lowered temperature after power generation returns to the heat extraction device.

[0006] Optionally, the heat extraction device includes a heat pipe, which includes a condensation pipe section and at least one horizontal section, the horizontal section is horizontally arranged in the heat storage layer, one end of the condensation pipe section is connected to the horizontal section, the other end of the condensation pipe section extends toward the ground, the horizontal section and the condensation pipe section are interconnected, and the working fluid inlet and the heat source outlet are provided at one end of the condensation pipe section away from the horizontal section, and the in-situ power generation subsystem is arranged in the horizontal section.

[0007] Optionally, the condensation pipe section is vertically arranged to form a vertical section.

[0008] Optionally, the in-situ power generation subsystem includes a thermovoltaic panel power generation component, and the thermovoltaic panel power generation component is attached to a portion of the heat extraction device.

[0009] Optionally, the thermoelectric panel power generation assembly includes: a stainless steel casing; a thermoelectric material layer, which is arranged around a portion of the heat extraction device, and the thermoelectric material layer is sleeved in the stainless steel casing.

[0010] Optionally, the thermoelectric material layer is made of PN junction thermoelectric material.

[0011] Optionally, a heat-conducting layer is provided between the thermoelectric material layer and the stainless steel sleeve.

[0012] Optionally, the cold source environment includes air, and the ground power generation system includes: a thermovoltaic power generation module, which is provided with the thermal energy inlet and the thermal energy outlet; a delivery pump, which is connected to the working fluid inlet and the thermal energy outlet; wherein the thermovoltaic power generation module is placed in the air.

[0013] Optionally, the ground power generation system also includes a boosting device, which is connected between the heat source outlet and the heat energy inlet. The boosting device is suitable for boosting the working fluid coming out of the heat source outlet, and increasing the temperature of the boosted working fluid before entering the thermovoltaic power generation module.

[0014] Optionally, the boosting device comprises a compressor.

[0015] Optionally, the working fluid may be any one of water, ammonia or carbon dioxide according to the temperature of the heat storage layer.

[0016] The technical solution of the present invention has the following advantages:

[0017] 1. The geothermal energy-based battery integration system provided by the present invention utilizes the temperature of the same gradient in the heat storage layer as a constant temperature as a heat source, arranges a heat extraction device in the heat storage layer and introduces a working fluid, so that the working fluid undergoes a phase change at a phase change temperature. When the phase change temperature is the evaporation temperature, the working fluid evaporates at the evaporation temperature to form a constant temperature cold source, thereby forming a constant temperature difference. An in-situ power generation subsystem is arranged to realize horizontal temperature difference power generation through the in-situ power generation subsystem to form a battery system, thereby abandoning the secondary conversion of thermal energy to mechanical energy and then to electrical energy, and directly converting the thermal energy of the heat storage layer into electrical energy, thereby improving the power generation efficiency.

[0018] 2. The geothermal energy-based battery integrated system provided by the present invention can ensure that the working fluid has a lower condensation temperature by pressurizing the incoming working fluid through a pressurizing device, thereby obtaining a larger temperature difference between the low evaporation temperature of the working fluid and the constant heat storage layer, thereby further improving the power generation efficiency, and can further realize the thermal energy utilization of the heat storage layer, so that the compressed working fluid has a larger waste heat, and the compressed working fluid is used as a heat source and the ambient temperature is used as a cold source to form a waste heat thermovoltaic power generation module.

[0019] 3. The geothermal energy-based battery integration system provided by the present invention improves the quality of medium and low temperature geothermal energy by converting medium and low temperature thermal energy into electrical energy, making thermal energy below 90°C also economical for power generation.

[0020] 4. The geothermal energy-based battery integrated system provided by the present invention directly converts thermal energy into electrical energy without secondary energy conversion, thereby increasing the thermal efficiency from less than 20% to about 80%, greatly improving efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A schematic diagram of a geothermal energy-based battery integration system provided in an embodiment of the present invention;

[0023] Figure 2 It is a schematic cross-sectional structural diagram of a heat extraction device of a battery integration system based on geothermal energy provided in an embodiment of the present invention.

[0024] Description of reference numerals:

[0025] 1-heat storage layer; 2-heat extraction device; 21-condensing pipe section; 23-horizontal section; 3-in-situ power generation subsystem; 31-stainless steel casing; 33-thermoelectric material layer; 35-heat conductive layer; 4-ground power generation subsystem; 41-thermovoltaic power generation module; 43-transport pump; 45-boosting device. DETAILED DESCRIPTION

[0026] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0030] Example 1

[0031] like Figure 1 A specific embodiment of a geothermal energy-based battery integrated system is shown, and the geothermal energy-based battery integrated system includes: a heat storage layer 1, a heat extraction device 2, an in-situ power generation subsystem 3 and at least one level of ground power generation subsystem 4, the heat storage layer 1 is arranged underground, the heat extraction device 2 is placed in the heat storage layer 1, the heat extraction device 2 is provided with a working fluid inlet and a heat source outlet, the working fluid inlet is suitable for passing the working fluid to exchange heat with the heat extraction device 2 and generate a constant temperature difference, the in-situ power generation subsystem 3 is arranged on the heat extraction device 2 to generate electricity using the constant temperature difference, the ground power generation subsystem 4 is provided with a heat energy inlet and a heat energy outlet, the heat energy inlet is connected to the heat extraction device 2 to obtain the heat source of the heat extraction device 2 and generate electricity, the ground power generation subsystem 4 is placed in a cold source environment, and the heat energy outlet of the ground power generation subsystem 4 is connected to the working fluid inlet so that the working fluid with a lowered temperature after power generation returns to the heat extraction device 2.

[0032] The above-mentioned heat storage layer 1 is located underground. The heat storage layer 1 can form a gradient temperature according to different depths from the ground, that is, different temperatures are formed on different gradients, and the temperature at the same gradient is constant. A well is drilled in the heat storage layer 1. The heat storage layer 1 at the bottom of the well can be a dry well or a hot water well. The heat extraction device 2 can be installed in the well, and the heat extraction device 2 can fit the well wall so as to fully obtain the heat source of the heat storage layer 1. The working fluid is injected into the heat extraction device 2 through the working fluid inlet, and the working fluid and the heat extraction device 2 undergo heat exchange, which can cause the working fluid to undergo phase change and form a low-temperature zone. The temperature of the working fluid phase change is constant, and the heat extraction device 2 contacts the heat storage layer 1 to form a high-temperature zone. When the temperature of the high-temperature zone is relatively constant and the temperature of the low-temperature zone is relatively constant, a constant temperature difference will be formed, wherein high temperature refers to a relatively high temperature and low temperature refers to a relatively low temperature. Therefore, by setting an in-situ power generation subsystem 3 on the heat extraction device 2, in-situ power generation can be achieved. When the in-situ power generation subsystem 3 generates electricity using a constant temperature difference, a battery system can be formed. The working fluid can be water, which can evaporate into water vapor at high temperature, and the water vapor can enter the ground power generation subsystem 4 from the heat source outlet. The ground power generation subsystem 4 can generate electricity using the heat energy carried by the phase change of the working fluid. Taking water as the working fluid as an example, the water vapor heat energy inlet enters the ground power generation subsystem 4, and the ground power generation subsystem 4 is in a cold source environment, so that the ground power generation subsystem 4 can generate electricity using the temperature difference. After the ground power generation subsystem 4 completes power generation, the temperature of the working fluid entering from the heat energy inlet is further reduced, and the working fluid with reduced temperature flows out from the heat energy outlet and then enters the heat extraction device 2 from the working fluid inlet, completing the recycling of the working fluid.

[0033] Furthermore, the heat extraction device 2 includes a heat pipe, which includes a condensation pipe section 21 and at least one horizontal section 23. The horizontal section 23 is horizontally arranged in the heat storage layer 1. One end of the condensation pipe section 21 is connected to the horizontal section 23, and the other end of the condensation pipe section 21 extends toward the ground. The horizontal section 23 and the condensation pipe section 21 are interconnected. A working fluid inlet and a heat source outlet are provided at one end of the condensation pipe section 21 away from the horizontal section 23, and the in-situ power generation subsystem 3 is arranged in the horizontal section 23.

[0034] The above-mentioned heat pipe is placed in the heat storage layer 1, an L-shaped or multi-branch well is drilled in the heat storage layer 1, and the heat pipe is installed according to the shape of the well, and the heat pipe is divided into a condensation pipe section 21 and a horizontal section 23. As the heat pipe of the condensation pipe section 21 gets closer and closer to the ground, the temperature of the evaporated working fluid will become lower and lower before entering the ground power generation system. Since the working fluid evaporates at the evaporation temperature, when the steam formed after the working fluid evaporates rises in the condensation pipe section 21, condensation will occur, and the condensed working fluid will fall down and then flow into the horizontal section 23. It can be seen that the function of the condensation pipe section 21 is to condense the evaporated working fluid to more easily form a heat circulation loop. Among them, when the temperature at the bottom of the well is lower than 90°, it can be low temperature. Since the heat pipe can be injected with low-temperature working fluid such as carbon dioxide, the working fluid absorbs heat in the horizontal section 23 and evaporates at the evaporation temperature to form steam. The heat pipe is an ultra-long gravity heat pipe, and the heat pipe is processed into an L-shaped or horizontal multi-branch type to adapt to the shape of the well. The heat storage layer 1 forms different temperature gradients along the height direction. The heat storage layer 1 has the characteristic of constant temperature under the same temperature gradient, and the evaporation temperature of the working fluid is also constant. Therefore, by utilizing the constant temperature characteristics of the heat storage layer 1 under the same gradient and the thermophysical characteristics of the constant evaporation temperature of the working fluid, the temperature of the gradient where this horizontal section 23 is located maintains a constant temperature difference with the evaporation temperature. The in-situ power generation subsystem 3 is installed in the horizontal section 23 of the heat pipe, and a heat source outlet and a working fluid inlet are provided in the condensation pipe section 21 of the heat pipe. The working fluid inlet is suitable for passing the working fluid, such as carbon dioxide, so that the working fluid performs heat exchange in the heat pipe to generate a constant temperature difference on the heat pipe. The heat storage layer of the horizontal section 23 is used as a constant temperature heat source, and the evaporation temperature of the working fluid is used as a cold source, so that a constant large temperature difference thermovoltaic device can be obtained. The function of the condensation pipe section 21 of the super-field gravity heat pipe is to condense the evaporated working fluid to form a heat circulation loop. The in-situ power generation subsystem 3 is arranged on the horizontal section of the heat pipe to generate electricity by utilizing the constant temperature difference. The ground power generation subsystem 4 is connected to the heat source outlet, so that the working fluid that completes the heat exchange in the heat pipe forms the heat source of the ground power generation subsystem 4 to generate electricity. The ground power generation subsystem 4 is placed in a cold source environment, and the ground power generation subsystem 4 is connected to the working fluid inlet to introduce the working fluid with the temperature reduced into the heat pipe, thereby completing the recycling of the working fluid and improving the utilization rate of geothermal energy.

[0035] When there are multiple horizontal sections 23, each horizontal section 23 is connected to the condensation pipe section 21, and each horizontal section 23 is provided with an in-situ power generation subsystem 3, the thermal energy utilization rate and power generation efficiency of the heat storage layer 1 can be further improved.

[0036] Furthermore, the condensing pipe section 21 is arranged vertically to form a vertical section. The condensing pipe section 21 can be arranged obliquely or vertically. When the condensing pipe section 21 is arranged vertically, a vertical section is formed. The vertical section and the horizontal section 23 can be perpendicular to each other. When the condensing pipe section is arranged vertically, the condensed liquid is not easy to adhere to the pipe wall of the heat pipe, which can reduce the corrosion of the heat pipe.

[0037] Furthermore, the working fluid can be water, ammonia water or carbon dioxide according to the temperature of the heat reservoir 1. Among them, a matching working fluid can be selected according to the temperature of the heat reservoir 1. This working fluid is a phase change working fluid, which is also the working fluid of the subsequent high-temperature power generation subsystem. The working fluid absorbs heat from the heat extraction device 2 and evaporates into steam. The working fluid can be replaced according to the temperature of the heat reservoir 1. If the heat storage temperature is high, medium and high temperature working fluids such as ammonia water and water can be selected. If the temperature of the heat reservoir is low, below 90°C, a low-temperature working fluid such as carbon dioxide is required, and the power generation efficiency will be greater. Converting medium and low temperature thermal energy into electrical energy improves the quality of medium and low temperature geothermal energy, making thermal energy below 90°C also economical for power generation.

[0038] Furthermore, the in-situ power generation subsystem 3 includes a thermovoltaic panel power generation component, which is attached to a portion of the heat extraction device 2 .

[0039] The above-mentioned in-situ power generation subsystem 3 uses a thermovoltaic panel for power generation. The thermovoltaic panel is placed on the wall of the heat pipe, with the cold end close to the wall of the heat pipe and the hot end away from the wall of the heat pipe and in contact with the well wall. The in-situ power generation in the well directly converts the geothermal energy of the heat storage layer 1 into electrical energy without secondary energy conversion, and the thermal efficiency is increased from less than 20% to about 80%, which can greatly improve efficiency.

[0040] Furthermore, if Figure 2 As shown, the thermoelectric panel power generation assembly includes: a stainless steel casing 31 and a thermoelectric material layer 33, the thermoelectric material layer 33 is arranged around a part of the heat extraction device 2, and the thermoelectric material layer 33 is sleeved in the stainless steel casing 31. After the working medium absorbs heat, it evaporates at the evaporation temperature to form steam, and the steam rises along the condensation pipe section 21. Because the closer to the ground, the lower the temperature, as the ground temperature gradient becomes lower and lower, the working medium dissipates heat and condenses into liquid, and falls back to the horizontal section 23 of the heat return pipe under the action of gravity. The incompletely condensed steam enters the ground power generation subsystem 4 and can be used as a heat source, and the ambient temperature is used as a cold source, so that the ground power generation subsystem 4 generates electricity.

[0041] The above-mentioned thermoelectric material layer 33 is arranged around the horizontal section 23 of the heat extraction device 2, and the thermoelectric material layer 33 is in contact with the outer wall of the horizontal section 23, which can directly convert thermal energy into electrical energy. The stainless steel sleeve 31 has anti-corrosion and thermal insulation properties, which can prevent heat loss and further improve the heat exchange efficiency in the heat pipe.

[0042] Furthermore, the thermoelectric material layer 33 is made of PN junction thermoelectric material, wherein the thermoelectric material layer 33 uses high-performance PN junction thermoelectric material to be attached to the outer side of the horizontal section 23 of the heat pipe, the negative pole of the thermoelectric material layer 33 is close to the heat pipe side, and the positive pole of the thermoelectric material layer 33 is close to the heat storage layer side.

[0043] Furthermore, a heat conducting layer 35 is provided between the thermoelectric material layer 33 and the stainless steel sleeve 31 .

[0044] The material of the above-mentioned heat-conducting layer 35 can be a heat-conducting gel, wherein a gap is formed between the outer wall of the horizontal section 23 and the inner wall of the stainless steel sleeve 31 , and a layer of high heat-conducting gel material is filled in the gap to enhance the heat conduction of the heat storage layer 1 .

[0045] Furthermore, the cold source environment includes air, and the ground power generation electronic system 4 includes: a thermovoltaic power generation module 41 and a delivery pump 43, the thermovoltaic power generation module 41 is provided with a heat energy inlet and a heat energy outlet, and the delivery pump 43 is connected to the working fluid inlet and the heat energy outlet; wherein, the thermovoltaic power generation module 41 is placed in the air.

[0046] The above-mentioned thermovoltaic power generation module 41 is a thermovoltaic ground power generation. The working fluid enters the heat energy inlet from the heat source outlet to form the heat source of the thermovoltaic power generation module 41. The thermovoltaic power generation module 41 is in an air environment, and the air environment forms a cold source, so that the thermovoltaic power generation module 41 generates electricity using temperature difference. The temperature of the working fluid of the ground power generation electronic system 4 is further reduced. The working fluid with reduced temperature flows out from the heat energy outlet, and then enters the working fluid inlet through the delivery pump 43 and enters the heat pipe, realizing the recycling of the working fluid. Among them, the delivery pump 43 can be a recharging pump, which can form continuous liquid extraction.

[0047] Furthermore, the ground power generation electronic system 4 also includes a booster 45, which is connected between the heat source outlet and the heat energy inlet. The booster 45 is suitable for boosting the working fluid coming out of the heat source outlet, and increasing the temperature of the boosted working fluid before entering the thermovoltaic power generation module 41.

[0048] The upward pressure boosting device 45 may be provided with an inlet and an outlet, and the inlet is connected to the outlet of the heat source, so that the steam of the working fluid enters the pressure boosting device 45. The pressure boosting device 45 pressurizes the working fluid, so that the working fluid has a lower condensation temperature, thereby obtaining a greater temperature difference between the low evaporation temperature of the working fluid and the constant heat reservoir. The compressed working fluid has a large amount of waste heat, which flows out from the outlet and enters the thermovoltaic power generation module 41. The compressed working fluid is used as the heat source, and the ambient temperature is used as the cold source. The thermovoltaic power generation module 41 constitutes a waste heat thermovoltaic power generation device. This part of the power generation power can offset most of the power consumption of the pressure boosting device 45, and if the design is reasonable, it can even bring positive power generation benefits. Since the temperature difference is constant and large enough, it can constitute geothermal with stable power supply.

[0049] Furthermore, the booster device 45 includes a compressor. The compressor can ensure that the working fluid in the heat pipe has a lower condensation temperature, thereby obtaining a greater temperature difference between the low evaporation temperature of the working fluid and the constant heat reservoir. The compressed working fluid has a large amount of waste heat. The compressed fluid is used as a heat source and the ambient temperature is used as a cold source to form a waste heat thermovoltaic power generation module.

[0050] The geothermal energy-based battery integrated system in the present application is also an enhanced geothermal in-situ power generation system based on thermovoltaic technology, and is an enhanced geothermal power generation system driven by medium and low temperatures, mainly composed of an L-shaped or horizontal multi-branch heat pipe, a constant temperature difference thermovoltaic power generation component, a heat storage layer 1, a compressor, a waste heat thermovoltaic power generation module, and a working fluid pump. Drill an L-shaped or multi-branch well in the heat storage layer 1, which can be a dry well or a hot water well, and install heat pipes according to the shape of the well. The heat pipes are divided into a condensing pipe section 21 and a horizontal section 23. A low-temperature working fluid such as carbon dioxide is injected therein. Carbon dioxide has an evaporation temperature. Carbon dioxide absorbs heat in the horizontal section 23 and evaporates at the evaporation temperature. The heat storage layer 1 here maintains a constant temperature difference with the evaporation temperature, and a constant temperature difference thermovoltaic power generation component is installed in the horizontal section 23 of the heat pipe, such as Figure 2 As shown, the constant temperature difference thermovoltaic power generation assembly uses high-performance PN-section thermoelectric materials to be attached to the outside of the heat pipe wall. The negative electrode of the PN-section thermoelectric material is close to the heat pipe side, and the positive electrode is close to the heat storage layer side. A layer of high thermal conductivity gel material is filled in the gap between the outside of the PN-section thermoelectric material and the steel pipe shell to enhance the thermal conductivity of the heat storage layer 1. Carbon dioxide evaporates in the horizontal section 23 and generates electricity through the thermovoltaic device. The steam rises along the condensing pipe section 21. As the geothermal gradient becomes lower and lower, the carbon dioxide dissipates heat and condenses into liquid. Under the action of gravity, it falls back to the horizontal section 23 of the heat pipe. The incompletely condensed gas enters the compressor and is compressed into a high-temperature liquid that can be used as a heat source. The ambient temperature is used as a cold source, so that the waste heat thermovoltaic power generation device generates electricity. The temperature of the carbon dioxide after power generation is reduced, and it returns to the condensing pipe section 21 of the heat pipe through the recharging pump and then enters the horizontal section 23, completing a heat cycle loop.

[0051] By adopting the enhanced geothermal battery integrated system driven by medium and low temperature, medium and low temperature thermal energy is first converted into electrical energy, which improves the quality of medium and low temperature geothermal energy, making thermal energy below 90°C also economical for power generation; secondly, thermal energy is directly converted into electrical energy without secondary energy conversion, which increases the thermal efficiency from less than 20% to about 80%, greatly improving efficiency. The most important point is that the constant temperature difference thermovoltaic device is constructed by using the thermal properties of the heat storage layer 1 and the working fluid, and the temperature difference can be increased by the coordinated method of compressor refrigeration and power generation, and the maximum power generation can be achieved within the allowable range of the thermoelectric material performance. Finally, the enhanced geothermal battery is obtained through integration, which is an economical and efficient way of utilizing geothermal energy, occupies a small area, and has no impact on the environment.

[0052] Obviously, the above embodiments are only examples for clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the protection scope of the invention.

Claims

1. A battery integration system based on geothermal energy, characterized in that: include: A heat storage layer (1) is provided underground; A heat extraction device (2) is disposed in the heat storage layer (1), the heat extraction device (2) being provided with a working medium inlet and a heat source outlet, the working medium inlet being suitable for introducing a working medium to perform heat exchange with the heat extraction device (2) and generate a constant temperature difference; An in-situ power generation subsystem (3) is arranged on the heat extraction device (2) to generate power by utilizing the constant temperature difference, the in-situ power generation subsystem (3) comprising a thermoelectric panel power generation component, the thermoelectric panel power generation component is attached to a portion of the heat extraction device (2), the thermoelectric panel power generation component comprises a thermoelectric material layer (33) arranged around a portion of the heat extraction device (2), the thermoelectric material layer (33) being made of a PN node thermoelectric material; At least one level of ground power generation electronic system (4) is provided with a heat energy inlet and a heat energy outlet, the heat energy inlet is connected to the heat extraction device (2) to obtain the heat source of the heat extraction device (2) and generate electricity, the ground power generation electronic system (4) is placed in a cold source environment, and the heat energy outlet of the ground power generation electronic system (4) is connected to the working medium inlet so that the working medium with a reduced temperature after power generation returns to the heat extraction device (2), the ground power generation electronic system (4) comprises a thermovoltaic power generation module (41), and the thermovoltaic power generation module (41) is provided with the heat energy inlet and the heat energy outlet.

2. The geothermal energy-based battery integration system according to claim 1, characterized in that: The heat extraction device (2) comprises a heat pipe, wherein the heat pipe comprises a condensing pipe section (21) and at least one horizontal section (23), wherein the horizontal section (23) is arranged horizontally in the heat storage layer (1), wherein one end of the condensing pipe section (21) is connected to the horizontal section (23), and the other end of the condensing pipe section (21) extends toward the ground, wherein the horizontal section (23) and the condensing pipe section (21) are interconnected, and the working medium inlet and the heat source outlet are arranged at one end of the condensing pipe section (21) away from the horizontal section (23), and the in-situ power generation subsystem (3) is arranged in the horizontal section.

3. The geothermal energy-based battery integration system according to claim 2, characterized in that: The condensation pipe section (21) is arranged vertically to form a vertical section.

4. The geothermal energy-based battery integration system according to claim 1, characterized in that: The thermal photovoltaic panel power generation assembly comprises: A stainless steel sleeve (31), wherein the thermoelectric material layer (33) is sleeved inside the stainless steel sleeve (31).

5. The geothermal energy-based battery integration system according to claim 4, characterized in that: A heat-conducting layer (35) is sleeved between the thermoelectric material layer (33) and the stainless steel sleeve (31).

6. The geothermal energy-based battery integration system according to any one of claims 1 to 5, characterized in that: The cold source environment includes air, and the ground power generation system (4) includes: A delivery pump (43) connected to the working fluid inlet and the heat energy outlet; Wherein, the thermovoltaic power generation module (41) is placed in the air.

7. The geothermal energy-based battery integration system according to claim 6, characterized in that: The above-ground power generation system (4) further comprises a pressurizing device (45), wherein the pressurizing device (45) is connected between the heat source outlet and the heat energy inlet, and the pressurizing device (45) is suitable for pressurizing the working fluid coming out of the heat source outlet, and causing the pressurized working fluid to enter the thermovoltaic power generation module (41) after the temperature of the pressurized working fluid is increased.

8. The geothermal energy-based battery integration system according to claim 7, characterized in that: The boosting device (45) comprises a compressor.

9. The geothermal energy-based battery integration system according to any one of claims 1 to 5, characterized in that: The working fluid may be any one of water, ammonia or carbon dioxide depending on the temperature of the heat storage layer (1).

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