Heat management system of geothermal source heat pump of energy storage power station

Abstract

The utility model provides a heat management system for a geothermal source heat pump of an energy storage power station. The heat management system comprises an underground heat exchanger, a heat pump unit and a battery plug-in box, the battery plug-in box is connected with the heat pump unit through a first circulating pipeline, and the heat pump unit is connected with the underground heat exchanger through a second circulating pipeline; the heat pump unit and the underground heat exchanger can dissipate heat or supply heat to the battery subrack. The refrigerating system has the advantages that the relatively stable temperature of the earth surface is utilized, and heat is not directly absorbed from the atmosphere like a traditional refrigerating system; in the season that the soil temperature is higher than the temperature required by the battery plug-in box, the geothermal source heat pump can work as a heating machine; in seasons when the soil temperature is lower than the temperature required by the battery plug-in box, the geothermal source heat pump can work as a refrigerating machine; the geothermal source heat pump can operate efficiently throughout the year due to the bidirectional working capability.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage thermal management, in particular to a ground source heat pump thermal management system for an energy storage power station. Background Art

[0002] At present, the existing battery thermal management methods include the following two:

[0003] 1) For the refrigeration / heating of the battery cassette in the energy storage system, the displacement heat exchange method is adopted. After the refrigerant of the water-cooled unit exchanges heat with 50% ethylene glycol solution, the 50% ethylene glycol solution circulates through the liquid cooling plate to exchange heat with the battery cassette, so that the temperature of the battery cassette is maintained within a reasonable temperature range.

[0004] 2) For the refrigeration / heating of the battery cassette in the energy storage system, the direct cooling method is adopted. The refrigerant of the water-cooled unit directly circulates through the liquid cooling plate to exchange heat with the battery cassette, so that the temperature of the battery cassette is maintained within a reasonable temperature range.

[0005] However, there are problems with low energy efficiency ratio in the above two battery thermal management methods. Content of the Utility Model

[0006] The technical problem to be solved by the utility model is: the problem of low energy efficiency ratio of the battery thermal management method.

[0007] In order to solve the above technical problem, the technical solution adopted by the utility model is: a ground source heat pump thermal management system for an energy storage power station, including: an underground heat exchanger, a heat pump unit and a battery cassette; the battery cassette is connected to the heat pump unit through a first circulation pipeline, and the heat pump unit is connected to the underground heat exchanger through a second circulation pipeline; the heat pump unit and the underground heat exchanger can dissipate heat or supply heat to the battery cassette.

[0008] Further, the first circulation pipeline includes a first return water pipe and a first water supply pipe, and the battery cassette is provided with a cassette water inlet and a cassette water outlet; one end of the first return water pipe is connected to the cassette water outlet, and the other end of the first return water pipe is connected to the heat pump unit; one end of the first water supply pipe is connected to the cassette water inlet, and the other end of the first water supply pipe is connected to the heat pump unit.

[0009] Further, the heat pump unit includes an evaporator and a condenser; one side of the evaporator is provided with a first water inlet and a first water outlet, and the other side of the evaporator is provided with a second water inlet and a second water outlet; the first water inlet is connected to one end of the first return pipe, and the second water inlet is connected to one end of the first outlet pipe; one side of the condenser is provided with a third water inlet and a third water outlet, and the other side of the condenser is provided with a fourth water inlet and a fourth water outlet; the third water inlet is connected to the second water outlet through a pipeline, and the third water outlet is connected to the second water inlet through a pipeline; the fourth water inlet and the fourth water outlet are connected to the underground heat exchanger through a second circulation pipeline.

[0010] Further, the second circulation pipeline includes a second outlet pipe and a second return pipe. One end of the second outlet pipe is connected to the fourth water inlet, and the other end of the second outlet pipe is connected to the water outlet of the underground heat exchanger; one end of the second return pipe is connected to the fourth water outlet, and one end of the second return pipe is connected to the water inlet of the underground heat exchanger.

[0011] Further, the underground heat exchanger is a U-shaped pipeline.

[0012] Further, a plurality of underground heat exchangers are provided, and the plurality of heat exchangers are connected in parallel through the second outlet pipe and the second return pipe.

[0013] Further, an expansion tank and a first circulation pump are provided on the first return pipe.

[0014] Further, a second circulation pump is provided on the pipeline between the second water outlet and the third water inlet.

[0015] Further, an expansion valve is provided on the pipeline between the second water inlet and the third water outlet.

[0016] Further, a third circulation pump is provided on the second outlet pipe.

[0017] The beneficial effects of the present utility model are as follows: The efficiency of the heat management system of the ground source heat pump of the energy storage power station in this solution is relatively high because it utilizes the relatively stable temperature on the earth's surface instead of directly absorbing heat from the atmosphere like a traditional refrigeration system; in seasons when the soil temperature is higher than the temperature required by the battery cassette, the ground source heat pump can operate as a heater; while in seasons when the soil temperature is lower than the temperature required by the battery cassette, the ground source heat pump can operate as a refrigerator; this two-way working ability enables the ground source heat pump to operate efficiently throughout the year. Description of the Drawings

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the description of the embodiments or the prior art. Obviously, the 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 mechanisms shown in these drawings.

[0019] Figure 1 Structural schematic diagram of the ground heat source heat pump thermal management system of the energy storage power station in the embodiment of the present invention;

[0020] Figure 2 Structural schematic diagram of the battery insertion box in the embodiment of the present invention;

[0021] Among them, 11, the first return pipe; 12, the first outlet pipe; 20, the expansion tank; 30, the heat pump unit; 31, the first circulation pump; 32, the evaporator; 33, the expansion valve; 34, the second circulation pump; 35, the condenser; 36, the third circulation pump; 40, the underground heat exchanger; 41, the second return pipe; 42, the second outlet pipe; 50, the battery insertion box; 51, the insertion box water inlet; 52, the insertion box water outlet; 60, the ground. Detailed implementation manners

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the 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.

[0023] It should be noted that 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 technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of the 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.

[0024] Such as Figure 1 - Figure 2As shown in the figure, an embodiment of the present utility model is: a ground source heat pump thermal management system for an energy storage power station, including: an underground heat exchanger 40, a heat pump unit 30 and a battery cassette 50; the battery cassette 50 is connected to the heat pump unit 30 through a first circulation pipeline, and the heat pump unit 30 is connected to the underground heat exchanger 40 through a second circulation pipeline; the heat pump unit 30 and the underground heat exchanger 40 can dissipate heat or supply heat to the battery cassette 50.

[0025] In this embodiment, in a battery energy storage system, the battery cassette 50 needs to perform thermal energy management to maintain the battery temperature within a reasonable operating range, while keeping the system operation stable with less influence from the environment and improving the system energy efficiency ratio. Ground source heat pump thermal management is an efficient technical solution.

[0026] In a specific embodiment, the first circulation pipeline includes a first return water pipe 11 and a first water supply pipe 12. The battery cassette 50 is provided with a cassette water inlet 51 and a cassette water outlet 52; one end of the first return water pipe 11 is connected to the cassette water outlet 52, and the other end of the first return water pipe 11 is connected to the heat pump unit 30; one end of the first water supply pipe 12 is connected to the cassette water inlet 51, and the other end of the first water supply pipe 12 is connected to the heat pump unit 30.

[0027] Among them, the heat pump unit 30 includes an evaporator 32 and a condenser 35; one side of the evaporator 32 is provided with a first water inlet and a first water outlet, and the other side of the evaporator 32 is provided with a second water inlet and a second water outlet; the first water inlet is connected to one end of the first return water pipe 11, and the second water inlet is connected to one end of the first water supply pipe 12; one side of the condenser 35 is provided with a third water inlet and a third water outlet, and the other side of the condenser 35 is provided with a fourth water inlet and a fourth water outlet; the third water inlet is connected to the second water outlet through a pipeline, and the third water outlet is connected to the second water inlet through a pipeline; the fourth water inlet and the fourth water outlet are connected to the underground heat exchanger 40 through a second circulation pipeline.

[0028] Among them, the second circulation pipeline includes a second water supply pipe 42 and a second return water pipe 41. One end of the second water supply pipe 42 is connected to the fourth water inlet, and the other end of the second water supply pipe 42 is connected to the water outlet of the underground heat exchanger 40; one end of the second return water pipe 41 is connected to the fourth water outlet, and one end of the second return water pipe 41 is connected to the water inlet of the underground heat exchanger 40.

[0029] Among them, an expansion tank 20 and a first circulation water pump 31 are provided on the first return water pipe 11. A second circulation water pump 34 is provided on the pipeline between the second water outlet and the third water inlet. An expansion valve 33 is provided on the pipeline between the second water inlet and the third water outlet. A third circulation water pump 36 is provided on the second water supply pipe 42.

[0030] In this embodiment, the heat pump unit 30 is the core of the entire system, including a second circulating water pump 34, an evaporator 32, a condenser 35, and an expansion valve 33. Through the interaction of these components, the heat pump unit 30 can upgrade low-grade thermal energy to high-grade thermal energy and achieve heat transfer. The first circulating water pump 31 drives the working medium (water or antifreeze) to circulate between the battery cassette 50 and the evaporator 32 to ensure that the temperature of each battery cassette 50 in the system is maintained within a reasonable range. The third circulating water pump 36 is used to drive the working medium (water or antifreeze) in the underground heat exchanger 40 to circulate at a designed flow rate to ensure effective heat transfer.

[0031] Among them, the underground heat exchanger 40 is a U-shaped pipeline. A plurality of the underground heat exchangers 40 are provided, and the plurality of heat exchangers are connected in parallel through a second water outlet pipe 42 and a second water return pipe 41.

[0032] The underground heat exchanger 40 is composed of one or more U-shaped pipelines, and these U-shaped pipelines are buried 80 meters below the ground surface 60. Water or specially treated antifreeze is circulated in the pipelines through a circulating pump to absorb geothermal energy. The underground soil temperature remains basically at 17 - 18°C throughout the year. In the heating mode, the soil acts as a heater to increase the temperature of the circulating fluid and reduce the energy efficiency of the heat pump unit 30; in the cooling mode, the soil acts as a cooling tower / fan to increase the temperature of the circulating fluid and reduce the energy efficiency of the heat pump unit 30.

[0033] In the heating mode, the heat pump unit 30 uses a small amount of high-grade energy (such as electricity) to drive the compressor, and the compressor compresses the refrigerant (such as R410a, etc.) into a high-temperature and high-pressure gas. Then, these gases release heat in the condenser 35 to heat the working medium (water or antifreeze), and these heated fluids are transported through pipelines to the liquid cooling plate on the battery cassette 50, and the heat is released through the liquid cooling plate to increase the temperature of the battery cassette 50.

[0034] In the cooling mode, the working principle is opposite. The heat pump unit 30 absorbs heat from the battery cassette 50 and transfers the heat to the working medium in the underground heat exchanger 40 through the evaporator 32, thereby reducing the temperature of the battery cassette 50. In this way, the ground-source heat pump realizes the heating and cooling functions in winter and summer respectively.

[0035] The beneficial effects of the embodiment of the present utility model are as follows: The efficiency of the ground-source heat pump thermal management system of the energy storage power station in this solution is relatively high because it utilizes the relatively stable temperature on the earth's surface instead of directly absorbing heat from the atmosphere like a traditional refrigeration system; in seasons when the soil temperature is higher than the temperature required by the battery cassette 50, the ground-source heat pump can operate as a heater; while in seasons when the soil temperature is lower than the temperature required by the battery cassette 50, the ground-source heat pump can operate as a refrigerator; this two-way working ability enables the ground-source heat pump to operate efficiently throughout the year.

[0036] The above are only embodiments of the present utility model, and do not thus limit the patent scope of the present utility model. Any equivalent structural or equivalent process transformations made by using the content of the specification and drawings of the present utility model, or directly or indirectly applied in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A geothermal heat pump thermal management system for an energy storage power station, characterized in that: include: An underground heat exchanger, a heat pump unit and a battery plug box; the battery plug box is connected to the heat pump unit through a first circulation pipeline, and the heat pump unit is connected to the underground heat exchanger through a second circulation pipeline; the heat pump unit and the underground heat exchanger can dissipate heat or provide heat to the battery plug box.

2. The geothermal source heat pump thermal management system for an energy storage power station according to claim 1, characterized in that: The first circulation pipeline includes a first water return pipe and a first water outlet pipe. The battery plug-in box is provided with a plug-in box water inlet and a plug-in box water outlet; one end of the first water return pipe is connected to the plug-in box water outlet, and the other end of the first water return pipe is connected to the heat pump unit; one end of the first water outlet pipe is connected to the plug-in box water inlet, and the other end of the first water outlet pipe is connected to the heat pump unit.

3. The geothermal heat pump thermal management system for an energy storage power station according to claim 2, characterized in that: The heat pump unit includes an evaporator and a condenser; a first water inlet and a first water outlet are provided on one side of the evaporator, and a second water inlet and a second water outlet are provided on the other side of the evaporator; the first water inlet is connected to one end of a first return water pipe, and the second water inlet is connected to one end of a first water outlet pipe; a third water inlet and a third water outlet are provided on one side of the condenser, and a fourth water inlet and a fourth water outlet are provided on the other side of the condenser; the third water inlet is connected to the second water outlet through a pipeline, and the third water outlet is connected to the second water inlet through a pipeline; the fourth water inlet and the fourth water outlet are connected to the underground heat exchanger through a second circulation pipeline.

4. The geothermal heat pump thermal management system for an energy storage power station according to claim 3, characterized in that: The second circulation pipeline includes a second water outlet pipe and a second water return pipe, one end of the second water outlet pipe is connected to the fourth water inlet, and the other end of the second water outlet pipe is connected to the water outlet of the underground heat exchanger; one end of the second water return pipe is connected to the fourth water outlet, and one end of the second water return pipe is connected to the water inlet of the underground heat exchanger.

5. The geothermal heat pump thermal management system for an energy storage power station according to claim 4, characterized in that: The underground heat exchanger is a U-shaped pipe.

6. The geothermal heat pump thermal management system for an energy storage power station according to claim 5, characterized in that: The underground heat exchangers are provided in plurality, and the plurality of heat exchangers are connected in parallel through the second water outlet pipe and the second water return pipe.

7. The geothermal heat pump thermal management system for an energy storage power station according to claim 6, characterized in that: The first water return pipe is provided with an expansion water tank and a first circulating water pump.

8. The geothermal source heat pump thermal management system for an energy storage power station according to claim 7, characterized in that: A second circulating water pump is provided on the pipeline between the second water outlet and the third water inlet.

9. The geothermal heat pump thermal management system for an energy storage power station according to claim 8, characterized in that: An expansion valve is provided on the pipeline between the second water inlet and the third water outlet.

10. The geothermal heat pump thermal management system for an energy storage power station according to claim 9, characterized in that: The second water outlet pipe is provided with a third circulating water pump.

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