Energy-saving photovoltaic energy storage power station heat exchange device

Abstract

The utility model discloses an energy-saving photovoltaic energy storage power station heat exchange device, which belongs to the technical field of energy storage power station temperature control, and comprises a fan coil, a geothermal heat pump unit and a buried pipe which are sequentially communicated with an energy storage power station, the fan coil is arranged in the energy storage power station, the buried pipe is pre-buried underground, and the geothermal heat pump unit is arranged in the energy storage power station. And the geothermal heat pump unit is communicated with the fan coil through a refrigerating and heating switching unit. According to the energy-saving type heat exchange device of the energy storage power station, due to the fact that the geothermal heat pump unit and the fan coil are arranged, the energy storage power station can be cooled when the environment temperature is high or heated when the environment temperature is cold through terrestrial heat, and therefore the proper temperature in the energy storage power station is maintained.

Description

Technical Field

[0001] The utility model relates to the technical field of temperature control of energy storage power stations, and in particular to an energy-saving heat exchange device for a photovoltaic energy storage power station. Background Art

[0002] To promote energy conservation and emission reduction, the development of integrated photovoltaic (PV) and storage (storage) projects is being vigorously promoted. These integrated PV-storage-charging power stations store electricity generated by photovoltaic power generation, integrating photovoltaic, energy storage, and charging facilities into a microgrid. These power stations intelligently interact with the public grid based on demand, enabling both on-grid and off-grid operation. Once these integrated PV-storage-charging power stations reach scale, they will not only effectively support the deployment of intercity charging networks but also leverage the technical characteristics of PV-storage-charging to participate in ancillary services such as peak-shaving and frequency regulation, as well as peak-load shifting and valley-filling.

[0003] Existing energy storage power stations for storing electrical energy generally use electrochemical energy storage batteries as a medium, which can be connected to the load side to carry out applications such as peak shaving and valley filling, demand control, temporary capacity expansion, and new energy consumption. The increase in the temperature of the energy storage batteries in the energy storage battery pack unit will accelerate the rate of chemical reactions. For lithium batteries, this means that in a high temperature environment, the chemical reactions inside the battery will become more active, which may cause the decomposition of the electrolyte, damage to the electrode materials, and even gas expansion, increasing internal pressure. When the temperature continues to rise to a certain level, if this exothermic reaction is not effectively controlled, it will further aggravate the rise in battery temperature. In some cases, this chain reaction may cause the battery structure to rupture, resulting in the opening of the battery safety valve, gas jets, smoke, and even fire and explosion. At the same time, when energy storage batteries operate in a low temperature environment, they will experience problems such as decreased capacity, increased internal resistance, increased difficulty in charging, and shortened life.

[0004] It's clear that the temperature of energy storage batteries is the most critical factor affecting the capacity and lifespan of energy storage products. Therefore, the battery clusters in energy storage power stations require a stable temperature. Existing technology generally achieves this by installing thermostats on the power stations. However, because energy storage power stations are located outdoors for extended periods, even in the wild, the fan coil units used for thermostat control have high requirements for protection, insulation rating, service life, and operating temperature. Furthermore, using various fan coil units, air conditioners, and other equipment to control the operating temperature within energy storage power stations consumes significant amounts of electricity. Utility Model Content

[0005] To address the above-mentioned issues, the present invention provides an energy-saving heat exchange device for a photovoltaic energy storage power station. By installing a geothermal heat pump unit and a fan coil unit, the device can utilize geothermal heat to cool the energy storage power station and battery clusters and packs when the ambient temperature is high, or to heat them when the ambient temperature is cold, thereby maintaining a constant internal temperature of the energy storage power station, battery clusters, and packs, thereby addressing the problem of large amounts of electricity required to regulate the working environment temperature within the energy storage power station.

[0006] To achieve the above purpose, the utility model provides an energy-saving photovoltaic energy storage power station heat exchange device, comprising a fan coil unit, a geothermal heat pump unit and a buried pipe connected to the energy storage power station in sequence, the fan coil unit is arranged inside the energy storage power station, the buried pipe is pre-buried underground, and the geothermal heat pump unit and the fan coil unit are connected via a cooling and heating switching unit.

[0007] Preferably, the cooling and heating switching unit includes a first fluid heat exchanger and a second fluid heat exchanger connected in series, and a heat pump assembly arranged between the first fluid heat exchanger and the second fluid heat exchanger, the input end of the first fluid pipe of the first fluid heat exchanger is connected to the output end of the buried pipe via the first circulation pump, the input end of the buried pipe is connected to the output end of the first fluid pipe of the first fluid heat exchanger, the input end of the second fluid pipe of the first fluid heat exchanger is connected to the output end of the first fluid pipe of the second fluid heat exchanger via the expansion valve, the input end of the first fluid pipe of the second fluid heat exchanger is connected to the first pipe port of the four-way valve, the main port of the four-way valve is connected to the output end of the compressor, the input port of the compressor is connected to the second pipe port of the four-way valve, and the third interface pipe of the four-way valve is connected to the output end of the second fluid pipe of the first fluid heat exchanger;

[0008] The output end of the second fluid pipe of the second fluid heat exchanger is connected to the input end of the fan coil through a second circulation pump, and the output end of the fan coil is connected to the input end of the second fluid pipe of the second fluid heat exchanger. A second circulation pump is arranged between the second fluid heat exchanger and the fan coil.

[0009] Preferably, a first backup circulation pump is connected in parallel to the first circulation pump, and a second backup circulation pump is connected in parallel to the second circulation pump;

[0010] Both ends of the first backup circulation pump and both ends of the second backup circulation pump are provided with stop valves.

[0011] Preferably, multiple battery clusters are arranged inside the energy storage power station, and fan coil units are provided on the energy storage power station above the battery clusters. The fan coil units are connected to the liquid cooling main pipe wrapped around the battery clusters via a circulation pipe.

[0012] Preferably, ventilation holes are provided on both sides of the energy storage power station, and the height of the ventilation holes matches the height of the battery cluster.

[0013] The utility model has the following beneficial effects:

[0014] By installing geothermal heat pump units and fan coil units, geothermal heat can be used to cool the energy storage power station and battery clusters and battery packs when the ambient temperature is high, or to heat them up when it is cold, thereby maintaining a constant internal temperature of the energy storage power station and battery clusters and battery packs.

[0015] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a layout diagram of an energy-saving photovoltaic energy storage power station heat exchange device of the utility model.

[0017] Among them: 1. Energy storage power station; 2. Fan coil unit; 3. Battery cluster; 4. Ventilation hole; 5. Second circulation pump; 6. Second backup circulation pump; 7. Stop valve; 8. Second fluid heat exchanger; 9. Compressor; 10. First circulation pump; 11. First backup circulation pump; 12. Buried pipe; 13. Four-way valve; 14. Expansion valve; 15. First fluid heat exchanger; 16. Battery pack; 17. Circulation pipe; 18. Liquid cooling main pipe. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with the accompanying drawings. It should be noted that this embodiment is based on the technical solution and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to this embodiment.

[0019] like Figure 1 As shown, an energy-saving photovoltaic energy storage power station heat exchange device includes a fan coil 2, a geothermal heat pump unit and a buried pipe 12 which are sequentially connected to the energy storage power station 1. The fan coil 2 is arranged inside the energy storage power station 1, and the buried pipe 12 is pre-buried underground. The geothermal heat pump unit and the fan coil 2 are connected via a cooling and heating switching unit.

[0020] Specifically, the cooling and heating switching unit includes a first fluid heat exchanger 15, a second fluid heat exchanger 8 connected in series, and a heat pump assembly arranged between the first fluid heat exchanger 15 and the second fluid heat exchanger 8. The input end of the first fluid pipe of the first fluid heat exchanger 15 is connected to the output end of the buried pipe 12 through the first circulation pump 10, the input end of the buried pipe 12 is connected to the output end of the first fluid pipe of the first fluid heat exchanger 15, the input end of the second fluid pipe of the first fluid heat exchanger 15 is connected to the output end of the first fluid pipe of the second fluid heat exchanger 8 through the expansion valve 14, and the second fluid heat exchanger 8 is connected to the first fluid pipe of the second fluid heat exchanger 8. The input end of a fluid pipe is connected to the first pipe port of the four-way valve 13, the main port of the four-way valve 13 is connected to the output end of the compressor 9, the input port of the compressor 9 is connected to the second pipe port of the four-way valve 13, and the third interface pipe of the four-way valve 13 is connected to the output end of the second fluid pipe of the first fluid heat exchanger 15; the output end of the second fluid pipe of the second fluid heat exchanger 8 is connected to the input end of the fan coil 2 via the second circulation pump 5, and the output end of the fan coil 2 is connected to the input end of the second fluid pipe of the second fluid heat exchanger 8, and a second circulation pump 5 is arranged between the second fluid heat exchanger 8 and the fan coil 2.

[0021] A first backup circulating pump 11 is connected in parallel to the first circulating pump 10, and a second backup circulating pump 6 is connected in parallel to the second circulating pump 5; both ends of the first backup circulating pump 11 and both ends of the second backup circulating pump 6 are provided with stop valves 7. When a backup circulating pump is provided, the backup circulating pump can be switched to operate when the circulating pump is damaged, thereby reducing the impact on normal operation.

[0022] Energy storage station 1 houses multiple battery clusters 3, which form a battery pack 16. A fan coil unit 2 is installed above the battery clusters 3. This fan coil unit 2 is connected via a circulation pipe 17 to a liquid cooling main pipe 18 wrapped around the battery clusters 3. Ventilation holes 4 are located on both sides of energy storage station 1, their height matching that of the battery clusters 3 to further enhance heat exchange.

[0023] Refrigeration process:

[0024] The medium in the underground pipe 12 enters the first fluid pipe of the first fluid heat exchanger 15 through the first circulation pump 10 and then flows back to the underground pipe 12, absorbing heat and cooling the medium in the second fluid pipe of the first fluid heat exchanger 15.

[0025] At this time, the four-way valve 13 is not energized, the main port of the four-way valve 13 is connected to the first interface pipe, and the second interface pipe is connected to the third interface pipe. The medium passes through the compressor 9 to perform work and enters the first fluid pipe of the second fluid heat exchanger 8 from the main port and the first interface pipe to absorb heat and release heat. After heat exchange, the high-temperature and high-pressure medium in the first fluid pipe of the second fluid heat exchanger 8 passes through the expansion valve 14 and the second fluid pipe in the first fluid heat exchanger 15 in sequence to absorb cold and release heat, and then passes through the third interface pipe and the second interface pipe of the four-way valve 13 in sequence before returning to the compressor 9.

[0026] The cooling medium in the second fluid pipe of the second fluid heat exchanger 8, which has undergone heat exchange, enters the fan coil unit 2 through the second circulation pump 5, and then enters the liquid cooling main pipe 18 through the circulation pipe 17 to cool the surface of the battery cluster 3. At the same time, the fan on the fan coil unit 2 blows cold air into the interior of the energy storage power station 1 to cool the internal environment of the energy storage power station 1. The medium, which has absorbed heat and cooled, becomes high temperature and flows back to the second fluid pipe of the second fluid heat exchanger 8 to absorb cold and release heat again, thus completing the cycle.

[0027] Heating process:

[0028] The medium in the underground pipe 12 enters the first fluid pipe of the first fluid heat exchanger 15 through the first circulation pump 10 and then flows back to the underground pipe 12, absorbing cold and releasing heat to the medium in the second fluid pipe of the first fluid heat exchanger 15;

[0029] At this time, the four-way valve 13 is energized, the main port of the four-way valve 13 is connected to the third interface pipe, and the first interface pipe and the second interface pipe are connected. The medium passes through the main port and the third interface pipe after the compressor 9 performs work and enters the second fluid pipe of the first fluid heat exchanger 15 to absorb heat. After heat exchange, the medium in the first fluid pipe of the second fluid heat exchanger 8 passes through the expansion valve 14 and the first fluid pipe in the second fluid heat exchanger 8 in sequence to absorb cold and release heat, and then passes through the first interface pipe and the second interface pipe of the four-way valve 13 in sequence before returning to the compressor 9.

[0030] The medium in the second fluid pipe of the second fluid heat exchanger 8, which has undergone heat exchange, enters the fan coil 2 through the second circulation pump 5, reduces heat and releases it to the energy storage power station 1. At the same time, the circulation pipe 17 and the liquid cooling main pipe 18 are used to heat the surface of the battery cluster 3. After absorbing heat and releasing heat, the medium turns to low temperature and flows back to the second fluid pipe of the second fluid heat exchanger 8 to absorb heat and release heat again, thus completing the cycle.

[0031] Therefore, the present invention adopts the energy-saving photovoltaic energy storage power station heat exchange device of the above structure. By setting up a geothermal heat pump unit and a fan coil unit, the geothermal heat can be used to cool the energy storage power station and the battery cluster and battery pack when the ambient temperature is high, or to heat the energy storage power station and the battery cluster and battery pack when it is cold, thereby maintaining a constant internal temperature of the energy storage power station and the battery cluster and battery pack.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. An energy-saving photovoltaic energy storage power station heat exchange device, characterized by: It includes a fan coil unit, a geothermal heat pump unit and an underground pipe which are connected to the energy storage power station in sequence. The fan coil unit is arranged inside the energy storage power station, the underground pipe is pre-buried underground, and the geothermal heat pump unit and the fan coil unit are connected through a cooling and heating switching unit.

2. The energy-saving photovoltaic energy storage power station heat exchange device according to claim 1, characterized in that: The cooling and heating switching unit includes a first fluid heat exchanger and a second fluid heat exchanger connected in series, and a heat pump unit arranged between the first fluid heat exchanger and the second fluid heat exchanger, the input end of the first fluid pipe of the first fluid heat exchanger is connected to the output end of the buried pipe via a first circulation pump, the input end of the buried pipe is connected to the output end of the first fluid pipe of the first fluid heat exchanger, the input end of the second fluid pipe of the first fluid heat exchanger is connected to the output end of the first fluid pipe of the second fluid heat exchanger via an expansion valve, the input end of the first fluid pipe of the second fluid heat exchanger is connected to the first pipe port of the four-way valve, the main port of the four-way valve is connected to the output end of the compressor, the input port of the compressor is connected to the second pipe port of the four-way valve, and the third interface pipe of the four-way valve is connected to the output end of the second fluid pipe of the first fluid heat exchanger; The output end of the second fluid pipe of the second fluid heat exchanger is connected to the input end of the fan coil through a second circulation pump, and the output end of the fan coil is connected to the input end of the second fluid pipe of the second fluid heat exchanger. A second circulation pump is arranged between the second fluid heat exchanger and the fan coil.

3. The energy-saving photovoltaic energy storage power station heat exchange device according to claim 2, characterized in that: The first circulation pump is connected in parallel with a first backup circulation pump, and the second circulation pump is connected in parallel with a second backup circulation pump; Both ends of the first backup circulation pump and both ends of the second backup circulation pump are provided with stop valves.

4. The energy-saving photovoltaic energy storage power station heat exchange device according to claim 1, characterized in that: There are multiple battery clusters arranged inside the energy storage power station. A fan coil is installed on the energy storage power station above the battery clusters. The fan coil is connected to the liquid cooling main pipe wrapped around the battery cluster through a circulation pipe.

5. The energy-saving photovoltaic energy storage power station heat exchange device according to claim 4, characterized in that: There are ventilation holes on both sides of the energy storage power station, and the height of the ventilation holes matches the height of the battery cluster.

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