Cooling system of energy storage power station

Abstract

The utility model relates to the technical field of energy storage devices, and discloses an energy storage power station cooling system which comprises a first liquid cooling device and a second liquid cooling device, a first heat exchange pipeline in the first liquid cooling device exchanges heat with a battery cluster in a prefabricated cabin, and a second heat exchange pipeline in the second liquid cooling device exchanges heat with a battery cluster in a prefabricated cabin. A refrigerant in the refrigeration loop and a first coolant in the first heat exchange pipeline are subjected to heat exchange in the heat exchanger, so that the temperature of the first coolant is changed, heat generated by the battery cluster is brought out of the prefabricated cabin, and the battery cluster is cooled; a second heat exchange pipeline of the second liquid cooling device exchanges heat with the electrical equipment, and the second heat exchange pipeline dissipates heat through a second heat dissipation part, so that heat generated on the electrical equipment is brought out of the electrical equipment through a liquid cooling loop, and the electrical equipment is cooled; and the fan corresponds to the condenser and the second heat dissipation part, and the second heat dissipation part and the condenser share one fan for heat dissipation and cooling, so that the energy is saved, the consumption is reduced, and the cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage devices, in particular to a cooling system for an energy storage power station. Background Art

[0002] The energy storage units in the energy storage power station mainly include energy storage prefabricated cabins and inverter-boost integrated cabins, among which a number of battery clusters are arranged in the energy storage prefabricated cabin, and electrical equipment such as PCS (energy storage inverter) is arranged in the inverter-boost integrated cabin. The battery cluster is used to store or release electric energy, and the electrical equipment is used to control the battery, for example, the energy storage inverter is used to control the charging and discharging process of the battery and perform AC-DC conversion. A large amount of heat will be generated during the operation of the battery and the energy storage inverter, which needs to be cooled to maintain the safe operation of the equipment. Existing energy storage power stations usually use a water machine installed inside the energy storage prefabricated cabin to water-cool the battery cluster, and use an air cooling device to air-cool the electrical equipment.

[0003] However, the water machine installed in the energy storage prefabricated cabin and the air cooling device for air cooling the electrical equipment each consume a lot of energy during operation, and the air cooling device is large in size and occupies a large area, so the energy consumption is high, resulting in high energy consumption and high cost of the energy storage power station cooling system. Utility Model Content

[0004] In view of this, the utility model provides a cooling system for an energy storage power station to solve the problem of high energy consumption and high cost of the cooling system for the energy storage power station.

[0005] The utility model provides a cooling system for an energy storage power station, comprising: a first liquid cooling device, comprising a first heat exchange pipeline, a refrigeration circuit and a fan, wherein the first heat exchange pipeline is suitable for being connected to a prefabricated cabin and undergoing heat exchange with a battery cluster in the prefabricated cabin; the refrigeration circuit comprises a heat exchanger, a compressor and a condenser connected in sequence, the first heat exchange pipeline passes through the heat exchanger, and the refrigerant in the refrigeration circuit and the first coolant in the first heat exchange pipeline undergo heat exchange in the heat exchanger; a second liquid cooling device comprises a second heat exchange pipeline, wherein the second heat exchange pipeline is suitable for being connected to an electrical device and undergoing heat exchange with the electrical device, a second heat dissipation portion is arranged on the second heat exchange pipeline, the second coolant in the second heat exchange pipeline dissipates heat through the second heat dissipation portion, and the second heat dissipation portion is arranged corresponding to the condenser; the fan is arranged corresponding to the condenser and the second heat dissipation portion to cool the condenser and the second heat dissipation portion.

[0006] Beneficial effect: by setting the first heat exchange pipeline in the first liquid cooling device to exchange heat with the battery cluster in the prefabricated cabin, and by the refrigerant in the refrigeration circuit and the first coolant in the first heat exchange pipeline to exchange heat in the heat exchanger, the temperature of the first coolant is changed, so that the heat generated by the battery cluster is brought out to the outside of the prefabricated cabin, and the battery cluster is cooled down. At the same time, by setting the second heat exchange pipeline of the second liquid cooling device to exchange heat with the electrical equipment, and the second heat exchange pipeline dissipates heat through the second heat dissipation part, the heat generated on the electrical equipment is brought out to the outside of the electrical equipment through the liquid cooling circuit, and the electrical equipment is cooled down. In addition, by setting the fan corresponding to the condenser and the second heat dissipation part, the second heat dissipation part can share a fan with the condenser for heat dissipation and cooling. The second liquid cooling device does not need to set up a separate refrigeration circuit to cool the second heat dissipation part, and the fan provides wind power to the condenser while providing wind power to the second heat dissipation part. Therefore, the first liquid cooling device does not need to increase additional power, thereby achieving energy saving and consumption reduction, and reducing cooling costs.

[0007] In an optional embodiment, the first heat exchange pipeline has a first inlet and a first outlet, the first inlet is suitable for communicating with the liquid outlet of the prefabricated cabin, and the first outlet is suitable for communicating with the liquid inlet on the corresponding prefabricated cabin, and the number of the prefabricated cabins is one or more.

[0008] Beneficial effect: By setting the first inlet of the first heat exchange pipeline to be connected with the liquid inlet on the prefabricated cabin and the first outlet to be connected with the liquid inlet on the prefabricated cabin, the first heat exchange pipeline is connected with the battery heat exchange device in the prefabricated cabin, thereby forming a complete first heat exchange circuit, and the first coolant circulates in the first heat exchange circuit to achieve continuous heat exchange with the battery cluster, thereby achieving continuous cooling of the battery cluster, which is beneficial to ensure that the battery cluster maintains a suitable temperature during long-term operation and improves safety; and because the first liquid cooling device is arranged outside the prefabricated cabin, the prefabricated cabin connected to the first heat exchange pipeline can be one or more, then the first liquid cooling device can achieve centralized cooling of battery clusters in multiple prefabricated cabins at the same time, the cooling system is highly efficient, and the cooling system as a whole is more energy-efficient.

[0009] In an optional embodiment, the first heat exchange pipeline includes a heat exchange branch and a heat dissipation branch connected in parallel, the heat exchange branch passes through the heat exchanger, the heat dissipation branch is provided with a first heat dissipation part, and the first coolant in the heat dissipation branch dissipates heat through the first heat dissipation part.

[0010] Beneficial effect: The first coolant in the heat exchange branch exchanges heat with the refrigerant in the cooling circuit in the heat exchanger, thereby cooling the first coolant; at the same time, the heat dissipation branch connected in parallel with the heat exchange branch diverts a part of the first coolant with a higher temperature flowing out of the prefabricated cabin, and the first coolant in the heat dissipation branch dissipates heat through the first heat dissipation part, thereby cooling this part of the first coolant, thereby increasing the cooling effect of the first coolant through the simultaneous operation of the heat exchanger and the first heat dissipation part, thereby increasing the refrigeration effect of the first liquid cooling device and further improving the working efficiency.

[0011] In an optional implementation, the condenser, the first heat dissipation part and the second heat dissipation part are arranged in sequence.

[0012] Beneficial effect: The fan can cool down the condenser, the first heat dissipation part and the second heat dissipation part at the same time, further improving the cooling efficiency, and can also improve the utilization rate of the fan, thereby achieving the purpose of saving energy consumption.

[0013] In an optional implementation, the fan is disposed on a side of the condenser away from the first heat dissipation portion to provide wind force from the second heat dissipation portion toward the condenser.

[0014] Beneficial effect: The second heat dissipation part, the first heat dissipation part and the condenser are stacked and use a common fan for heat dissipation. Under the action of the fan, the outdoor airflow first passes through the second heat dissipation part, then the first heat dissipation part, and finally the condenser. The temperature of the airflow contacted by the second heat dissipation part is the lowest, which prevents the heat of the condenser from being collected by the coolant inside the first heat dissipation part and the second heat dissipation part and failing to achieve the natural heat dissipation effect, thereby ensuring the effective heat dissipation of the first heat dissipation part and the second heat dissipation part. Among them, the fan is a countercurrent fan, and the blades rotate counterclockwise, which can be used to discharge hot air and has a good heat dissipation effect.

[0015] In an optional embodiment, the first heat dissipation part is a cooling coil; and / or the second heat dissipation part is a cooling coil.

[0016] Beneficial effect: Liquid is passed into the cooling coil, circulated through the long track of the cooling coil and the flow of external air, taking away the heat generated by the liquid on the surface of the cooling coil, dissipating heat and cooling the temperature, thereby cooling the liquid in the cooling coil. The cooling coil has a simple structure, good heat dissipation effect, is easy to layout, and the technology is mature and easy to obtain.

[0017] In an optional embodiment, a first circulation pump is provided on the first heat exchange pipeline, and the first circulation pump provides power for the flow of the first coolant; a second circulation pump is provided on the second heat exchange pipeline, and the second circulation pump provides power for the flow of the second coolant.

[0018] Beneficial effects: By arranging a first circulation pump on the first heat exchange pipeline, a driving force is provided for the flow of the first coolant, so that the first coolant flows in the first heat exchange pipeline, and the first coolant circulates in the first heat exchange loop, thereby realizing the first liquid cooling device to continuously cool down the battery cluster in the prefabricated cabin; by arranging a second circulation pump on the second heat exchange pipeline, a power is provided for the flow of the second coolant, so that the second coolant flows in the second heat exchange pipeline, and the second coolant circulates in the second heat exchange loop, thereby realizing the second liquid cooling device to continuously cool down the electrical equipment.

[0019] In an optional embodiment, the refrigeration circuit also includes: an expansion valve, the condenser, the expansion valve and the heat exchanger are connected in sequence, the expansion valve converts the refrigerant from liquid to vapor; and / or a one-way valve, the one-way valve is arranged between the compressor and the condenser.

[0020] Beneficial effect: The expansion valve converts the medium-temperature and high-pressure liquid refrigerant flowing out of the condenser into low-temperature and low-pressure wet steam, and then the refrigerant flows into the heat exchanger, where it absorbs heat to achieve a cooling effect on the first coolant. The expansion valve is widely used and has a good conversion effect.

[0021] In an optional embodiment, the first liquid cooling device further includes: an expansion tank, wherein the expansion tank is connected to the first heat exchange pipeline to adjust the liquid pressure in the first heat exchange pipeline.

[0022] Beneficial effect: The expansion tank absorbs or releases liquid through the gas pressure inside it to adapt to the change in water volume in the loop system. By arranging the expansion tank on the first heat exchange pipeline, it is used to buffer the pressure fluctuation in the first heat exchange pipeline and prevent the pressure in the first heat exchange pipeline from rising too fast or falling too sharply, thereby keeping the first heat exchange loop running at a relatively stable pressure and improving the stability of the first liquid cooling device.

[0023] In an optional embodiment, the first liquid cooling device also includes: a temperature sensor, which is arranged on the pipeline between the heat exchanger and the first outlet to detect the temperature of the first coolant after flowing through the heat exchanger; and / or, a heater, which is connected to the pipeline between the first inlet and the heat exchanger, and the heater selectively heats the first coolant.

[0024] Beneficial effect: By arranging a temperature sensor on the pipeline between the heat exchanger and the first outlet, it is convenient to detect the temperature of the first coolant after flowing through the heat exchanger, so as to avoid the first coolant temperature being too high and affecting the cooling effect on the battery cluster in the prefabricated cabin. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation methods of the utility model 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 utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 This is a schematic structural diagram of a cooling system for an energy storage power station according to an embodiment of the utility model;

[0027] Figure 2 This is a schematic diagram of the layout of a first liquid cooling device, a prefabricated cabin and electrical equipment according to an embodiment of the utility model.

[0028] Description of reference numerals:

[0029] 1. First liquid cooling device; 110. First heat exchange pipeline; 111. Heat exchange branch; 112. Heat dissipation branch; 101. Fan; 102. First heat dissipation unit; 103. First circulation pump; 104. Expansion tank; 105. Temperature sensor; 106. Heater; 107. Three-way valve; 121. Heat exchanger; 122. Compressor; 123. Condenser; 124. Expansion valve; 125. Check valve; 126. Filter; 127. Gas-liquid separator; 201. Second heat exchange pipeline; 202. Second heat dissipation unit; 203. Second circulation pump; 204. Second inlet; 205. Second outlet; 3. Prefabricated cabin; 301. Battery cluster; 4. Electrical equipment. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0031] Energy storage power stations usually have multiple prefabricated cabins. For example, a 100MWh energy storage power station requires 20 prefabricated cabins. In the related technology, an independent water machine is set in each prefabricated cabin. When all water machines work at the same time, the auxiliary power consumption is large. The PCS (energy storage converter) uses air cooling, which has low cooling efficiency and high energy consumption. In addition, since the entire PCS needs to be cooled, the required air cooling device is large in size and occupies a large area. Both the water machine and the air cooling device are used as cooling devices, but they need to work separately, which is not conducive to energy saving.

[0032] Combine the following Figure 1 to Figure 2 , describing an embodiment of the utility model.

[0033] According to an embodiment of the utility model, a cooling system for an energy storage power station is provided, including: a first liquid cooling device 1 and a second liquid cooling device. The first liquid cooling device 1 includes a first heat exchange pipeline 110, a refrigeration circuit and a fan 101. The first heat exchange pipeline 110 is suitable for being connected to the prefabricated cabin 3 and exchanging heat with the battery cluster 301 in the prefabricated cabin 3; the refrigeration circuit includes a heat exchanger 121, a compressor 122 and a condenser 123 connected in sequence. The first heat exchange pipeline 110 passes through the heat exchanger 121, and the refrigerant in the refrigeration circuit exchanges heat with the first coolant in the first heat exchange pipeline 110 in the heat exchanger 121; the second ... The device includes a second heat exchange pipeline 201, which is suitable for being connected to the electrical equipment 4 and exchanging heat with the electrical equipment 4. A second heat dissipation part 202 is arranged on the second heat exchange pipeline 201. The second coolant in the second heat exchange pipeline 201 dissipates heat through the second heat dissipation part 202. The second heat dissipation part 202 is arranged corresponding to the condenser 123; the fan 101 is arranged corresponding to the condenser 123 and the second heat dissipation part 202 to cool the condenser 123 and the second heat dissipation part 202.

[0034] The energy storage power station cooling system of this embodiment is applied, by setting the first heat exchange pipeline 110 in the first liquid cooling device 1 to exchange heat with the battery cluster 301 in the prefabricated cabin 3, and the refrigerant in the refrigeration circuit exchanges heat with the first coolant in the first heat exchange pipeline 110 in the heat exchanger 121, so as to change the temperature of the first coolant. When the temperature of the first coolant is lower than the battery temperature, the heat generated by the battery cluster 301 is taken out to the outside of the prefabricated cabin 3, so as to cool the battery cluster 301. At the same time, the second heat exchange pipeline 201 of the second liquid cooling device is set to exchange heat with the electrical equipment 4, and the second heat exchange pipeline 201 is connected to the second heat dissipation circuit 121. The heat generated by the electrical equipment 4 is brought out of the electrical equipment 4 through the liquid cooling circuit, thereby cooling the electrical equipment 4. In addition, by arranging the fan 101 corresponding to the condenser 123 and the second heat dissipation part 202, the second heat dissipation part 202 can share a fan 101 with the condenser 123 for heat dissipation and cooling. The second liquid cooling device does not need to set up a separate refrigeration circuit to cool the second heat dissipation part 202. The fan 101 provides wind power to the condenser 123 while also providing wind power to the second heat dissipation part 202. Therefore, the first liquid cooling device 1 does not need to increase additional power, thereby achieving energy saving and consumption reduction, and reducing cooling costs.

[0035] It should be noted that the prefabricated cabin 3 is provided with a battery heat exchange device, which is adjacent to the battery cluster 301 to exchange heat with the battery cluster 301. The battery heat exchange device can be a liquid cooling plate, etc. When the first heat exchange pipeline 110 in the first liquid cooling device is connected to the prefabricated cabin 3, the first heat exchange pipeline 110 is connected to the pipeline in the liquid cooling plate to form a first heat exchange loop. The first coolant circulates in the first heat exchange loop, and the first coolant exchanges heat with the battery cluster 301 through the liquid cooling plate. Usually, heat is generated during the operation of the battery. In order to avoid In order to prevent the battery temperature from being too high, the battery needs to be cooled. When the temperature of the first coolant is lower than the battery temperature, the first coolant absorbs the heat generated by the battery, thereby bringing the heat generated by the battery cluster 301 out of the prefabricated cabin 3 and further flowing into the heat exchanger 121. The first coolant exchanges heat with the coolant in the refrigeration circuit in the heat exchanger 121, thereby cooling the first coolant. Then, after flowing out of the heat exchanger 121, the first coolant enters the prefabricated cabin 3 again to exchange heat with the battery cluster 301, and the cycle is repeated to achieve continuous cooling of the battery cluster 301. An electrical heat exchange device is provided in the electrical equipment 4, and the electrical heat exchange device is adjacent to the electrical components in the electrical equipment 4. The electrical heat exchange device can be a cooling pipeline. When the second heat exchange pipeline 201 in the second liquid cooling device is connected to the electrical equipment 4, it means that the second heat exchange pipeline 201 is connected to the cooling pipeline. Specifically, the second heat exchange pipeline 201 has a second inlet 204 and a second outlet 205. The second inlet 204 is connected to the liquid outlet of the cooling pipeline, and the second outlet 205 is connected to the liquid inlet of the cooling pipeline, so that the second heat exchange pipeline 201 is connected to the electrical equipment 4 to form a second heat exchange loop. The second coolant circulates in the second heat exchange loop. The second coolant exchanges heat with the electrical components through the electrical heat exchange device, thereby taking the heat generated by the electrical components in the electrical equipment 4 out of the electrical equipment 4. Further, the second coolant flows to the second heat dissipation part 202 for heat dissipation and the temperature is reduced, and then flows into the electrical heat exchange device in the electrical equipment 4 again to exchange heat with the electrical components, and the cycle is repeated to achieve continuous cooling of the electrical equipment 4. Wherein, a plurality of battery clusters 301 may be arranged in each prefabricated cabin 3. The first heat exchange pipeline 110 may be an integral pipeline without branches, or a pipeline with branches. When the first heat exchange pipeline 110 is a pipeline without branches, the first heat exchange pipeline 110 passing through the heat exchanger 121 means that the pipeline passes through the heat exchanger 121; when the first heat exchange pipeline 110 has branches, the first heat exchange pipeline 110 passing through the heat exchanger 121 means that a branch passes through the heat exchanger 121.

[0036] Among them, the electrical equipment 4 can be a PCS (energy storage inverter). The PCS adopts liquid cooling. Compared with the traditional air cooling method, the volume of the energy storage inverter can be further reduced, and the space saved can be used to increase the power of the energy storage inverter. The reduced floor space is conducive to improving the competitiveness of the product. Since the internal components of the PCS can withstand a high temperature, the temperature of the second coolant entering the PCS can be less than 55°C. Therefore, only the second heat dissipation part 202 is used for natural cooling to meet the cooling requirements, and the energy storage inverter inlet temperature can be avoided to be too low, which increases energy consumption. If a second coolant with a lower temperature is introduced into the energy storage inverter, the temperature difference between the second coolant and the electrical components is too large, and condensation is easily generated, which will cause abnormal function of the internal circuit board of the energy storage inverter or insulation withstand voltage failure. Therefore, the electrical equipment 4 is liquid-cooled by the second cooling device and the second heat dissipation part 202 is naturally cooled.

[0037] Preferably, the first coolant and the second coolant are both water, and the first liquid cooling device 1 is a water machine. It can be understood that the first coolant and the second coolant can also be other liquids.

[0038] In one embodiment, the first heat exchange pipeline 110 has a first inlet and a first outlet, the first inlet is suitable for communicating with the liquid outlet of the prefabricated cabin 3, and the first outlet is suitable for communicating with the liquid inlet on the corresponding prefabricated cabin 3, and the number of the prefabricated cabins 3 is one or more. Among them, the liquid outlet of the prefabricated cabin 3 refers to the outlet of the pipeline in the battery heat exchange device in the prefabricated cabin 3, and the liquid inlet of the prefabricated cabin 3 refers to the inlet of the pipeline in the battery heat exchange device. By setting the first inlet of the first heat exchange pipeline 110 to be connected with the liquid inlet on the prefabricated cabin 3 and the first outlet to be connected with the liquid inlet on the prefabricated cabin 3, the first heat exchange pipeline 110 is connected with the battery heat exchange device in the prefabricated cabin 3, thereby forming a complete first heat exchange circuit. The first coolant circulates in the first heat exchange circuit to achieve continuous heat exchange with the battery cluster 301, thereby achieving continuous cooling of the battery cluster 301, which is beneficial to ensure that the battery cluster 301 maintains a suitable temperature during long-term operation and improves safety; and because the first liquid cooling device 1 is arranged outside the prefabricated cabin 3, the prefabricated cabin 3 connected to the first heat exchange pipeline 110 can be one or more, then the first liquid cooling device 1 can achieve centralized cooling of the battery clusters 301 in multiple prefabricated cabins 3 at the same time, the cooling system is efficient, and the cooling system as a whole is more energy-efficient.

[0039] Preferably, there are multiple prefabricated cabins 3, the liquid inlets of the multiple prefabricated cabins 3 are all connected to the first outlet of the first heat exchange pipeline 110, and the liquid outlets of the multiple prefabricated cabins 3 are all connected to the first inlet of the first heat exchange pipeline 110, thereby realizing centralized cooling of the multiple prefabricated cabins 3 by the first liquid cooling device 1.

[0040] It should be noted that the first liquid cooling device 1 uses an external water machine tray for centralized cooling, and the first liquid cooling device 1 provides cooling for multiple prefabricated cabins 3 and PCS nearby. Optionally, the water machine uses a 20-foot standard tray (6058mm*2438mm) form, the total power of the first liquid cooling device 1 is 400KW, and the cooling power required for a prefabricated cabin 3 is 80KW, then one first liquid cooling device 1 can provide centralized cooling for four prefabricated cabins 3 at the same time, further combined Figure 2 As shown, two prefabricated cabins 3 form a group, and one first liquid cooling device 1 is connected to the two groups (ie, four prefabricated cabins 3 ), so that one first liquid cooling device 1 can provide centralized cooling for the battery clusters 301 in the four nearby prefabricated cabins 3 at the same time.

[0041] In one embodiment, the first heat exchange pipeline 110 includes a parallel heat exchange branch 111 and a heat dissipation branch 112 . The heat exchange branch 111 passes through the heat exchanger 121 . The heat dissipation branch 112 is provided with a first heat dissipation portion 102 . The first coolant in the heat dissipation branch 112 dissipates heat through the first heat dissipation portion 102 . Among them, the pipeline on the heat exchange branch 111 passes through the heat exchanger 121, and the pipeline in the cooling circuit also passes through the heat exchanger 121. The first coolant in the heat exchange branch 111 and the refrigerant in the cooling circuit exchange heat in the heat exchanger 121 to achieve cooling of the first coolant; at the same time, the heat dissipation branch 112 connected in parallel with the heat exchange branch 111 diverts a part of the first coolant with a higher temperature flowing out of the prefabricated cabin 3, and the first coolant in the heat dissipation branch 112 dissipates heat through the first heat dissipation part 102, thereby achieving cooling of this part of the first coolant, thereby increasing the cooling effect of the first coolant through the simultaneous operation of the heat exchanger 121 and the first heat dissipation part 102, thereby increasing the cooling effect of the first liquid cooling device 1 and further improving the working efficiency.

[0042] In one embodiment, a three-way valve 107 is provided on the first heat exchange pipeline 110, the inlet of the three-way valve 107 is connected to the main pipeline of the first heat exchange pipeline 110, one outlet of the three-way valve 107 is connected to the pipeline on the heat exchange branch 111 and the other outlet is connected to the pipeline on the heat dissipation branch 112, thereby realizing the parallel connection of the heat exchange branch 111 and the heat dissipation branch 112.

[0043] In one embodiment, the condenser 123, the first heat dissipation part 102 and the second heat dissipation part 202 are arranged in sequence, and the fan 101 can cool the condenser 123, the first heat dissipation part 102 and the second heat dissipation part 202 at the same time, further improving the cooling efficiency, and can also improve the utilization rate of the fan 101 to achieve the purpose of saving energy.

[0044] In one embodiment, the fan 101 is arranged on a side of the condenser 123 away from the first heat dissipation part 102 to provide wind from the second heat dissipation part 202 toward the condenser 123. The second heat dissipation part 202, the first heat dissipation part 102 and the condenser 123 are designed in a stacked manner, and the fan 101 is used for heat dissipation. Under the action of the fan 101, the outdoor airflow first passes through the second heat dissipation part 202, then passes through the first heat dissipation part 102, and finally passes through the condenser 123. The temperature of the airflow contacted by the second heat dissipation part 202 is the lowest, which prevents the heat of the condenser 123 from being absorbed by the coolant inside the first heat dissipation part 102 and the second heat dissipation part 202 and failing to achieve the natural heat dissipation effect, thereby ensuring the effective heat dissipation of the first heat dissipation part 102 and the second heat dissipation part 202. Among them, the fan 101 is a counter-flow fan, and the blades rotate counterclockwise, which can be used to discharge hot air and has a good heat dissipation effect.

[0045] In one embodiment, the first heat dissipation part 102 is a cooling coil. It should be noted that the liquid is passed into the cooling coil, circulated through the path of the cooling coil long track and the flow of external air, taking away the heat generated by the liquid on the surface of the cooling coil, dissipating heat and cooling, thereby cooling the liquid in the cooling coil. Among them, the liquid passed into the cooling coil is the first coolant, and the first coolant in the heat dissipation branch 112 dissipates heat through the cooling coil. The cooling coil has a simple structure, good heat dissipation effect, is easy to layout, and has mature technology and is easy to obtain.

[0046] In one embodiment, the second heat dissipation part 202 is a cooling coil. Similarly, the liquid passed into the second heat dissipation part 202 is the second coolant, and the second coolant is cooled by the cooling coil. The cooling coil has a simple structure, good heat dissipation effect, easy layout, mature technology, and is easy to obtain.

[0047] In one embodiment, a first circulating pump 103 is provided on the first heat exchange pipeline 110, and the first circulating pump 103 provides power for the flow of the first coolant; a second circulating pump 203 is provided on the second heat exchange pipeline 201, and the second circulating pump 203 provides power for the flow of the second coolant. By providing the first circulating pump 103 on the first heat exchange pipeline 110, a driving force is provided for the flow of the first coolant, so that the first coolant flows in the first heat exchange pipeline 110, and the first coolant circulates in the first heat exchange loop, thereby realizing the first liquid cooling device 1 to continuously cool down the battery cluster 301 in the prefabricated cabin 3; by providing the second circulating pump 203 on the second heat exchange pipeline 201, a power is provided for the flow of the second coolant, so that the second coolant flows in the second heat exchange pipeline 201, and the second coolant circulates in the second heat exchange loop, thereby realizing the second liquid cooling device to continuously cool down the electrical equipment 4.

[0048] In one embodiment, the refrigeration circuit further includes: an expansion valve 124, the condenser 123, the expansion valve 124 and the heat exchanger 121 are connected in sequence, and the expansion valve 124 converts the refrigerant from a liquid state to a vapor state. Specifically, the expansion valve 124 converts the medium-temperature and high-pressure liquid refrigerant flowing out of the condenser 123 into a low-temperature and low-pressure wet steam, and then the refrigerant flows into the heat exchanger 121, absorbs heat in the heat exchanger 121, and achieves a refrigeration effect on the first coolant. The expansion valve 124 is widely used and has a good conversion effect.

[0049] In one embodiment, the refrigeration circuit also includes: a filter 126, which is arranged between the condenser 123 and the expansion valve 124 to filter impurities and pollutants in the refrigerant, adsorb and remove moisture in the refrigeration circuit, and prevent impurities and moisture from affecting the working performance of the refrigeration circuit, thereby protecting various components in the refrigeration circuit and extending the service life.

[0050] In one embodiment, the refrigeration circuit further includes: a one-way valve 125, which is disposed between the compressor 122 and the condenser 123. By disposing the one-way valve 125 between the compressor 122 and the condenser 123, the coolant can only flow from the compressor 122 to the condenser 123, thereby ensuring the one-way flow of the coolant and avoiding the backflow of the coolant, thereby protecting the compressor 122 from damage.

[0051] In one embodiment, the refrigeration circuit further includes: a gas-liquid separator 127, which is disposed between the compressor 122 and the heat exchanger 121 and is capable of separating liquid and gas components, protecting the compressor 122, and maintaining efficient operation of the refrigeration circuit.

[0052] In one embodiment, the first liquid cooling device 1 further includes: an expansion tank 104, which is connected to the first heat exchange pipeline 110 to adjust the liquid pressure in the first heat exchange pipeline 110. The expansion tank 104 absorbs or releases the liquid volume through the gas pressure inside it to adapt to the change in the water volume in the loop system. By arranging the expansion tank 104 on the first heat exchange pipeline 110, it is used to buffer the pressure fluctuation in the first heat exchange pipeline 110, prevent the pressure in the first heat exchange pipeline 110 from rising too fast or falling too sharply, thereby keeping the first heat exchange loop running at a relatively stable pressure, and improving the stability of the first liquid cooling device 1. Preferably, the expansion tank 104 is arranged near the first inlet of the first heat exchange pipeline 110.

[0053] In one embodiment, the first liquid cooling device 1 further includes: a temperature sensor 105, which is arranged on the pipeline between the heat exchanger 121 and the first outlet to detect the temperature of the first coolant after passing through the heat exchanger 121. By arranging the temperature sensor 105 on the pipeline between the heat exchanger 121 and the first outlet, it is convenient to detect the temperature of the first coolant after passing through the heat exchanger 121, so as to avoid the temperature of the first coolant being too high and affecting the cooling effect of the battery cluster 301 in the prefabricated cabin 3. Preferably, the temperature sensor 105 is arranged on the heat exchange branch 111.

[0054] In one embodiment, the first liquid cooling device 1 further includes: a heater 106, which is connected to the pipeline between the first inlet and the heat exchanger 121, and the heater 106 selectively heats the first coolant. It should be noted that in the low temperature environment in winter, in order to ensure the stable operation of the battery, the battery cluster 301 can be heated from the outside. When the battery cluster 301 needs to be heated, the heater 106 is turned on to heat the first coolant. The first coolant contacts the battery cluster 301 through the first heat exchange loop. The temperature of the first coolant is higher than the temperature of the battery, so that heat is transferred to the battery through heat exchange, thereby increasing the temperature of the battery cluster 301, ensuring that the power battery works in a suitable temperature environment to ensure the normal operation of the battery. At this time, the refrigeration loop is turned off, and the first coolant is no longer refrigerated; the fan 101 is turned off, and the first coolant is no longer cooled.

[0055] In this embodiment, the first liquid cooling device 1 is a water machine, and an external water machine tray is used to centrally cool the battery clusters 301 in multiple prefabricated cabins 3; the second liquid cooling device liquid-cools the electrical equipment 4 and dissipates heat through cooling coils. The cooling coils in the second liquid cooling device and the condenser 123 in the water machine tray share the fan 101 in the first liquid cooling device 1. The second liquid cooling device does not require the intervention of the refrigeration system, and the first liquid cooling device 1 does not need to increase additional power, which not only reduces the cost of the cooling system, but also achieves energy saving and consumption reduction.

[0056] In this embodiment, a high-power centralized water machine is used to centrally cool multiple prefabricated cabins 3. The cooling system is highly efficient and more energy-efficient as a whole. In addition, the volume of the energy storage inverter can be further reduced. The saved space can be used to increase the power of the energy storage inverter. When used in conjunction with a high-power prefabricated cabin, the overall cost and floor space of the energy storage system can be reduced, thereby improving product competitiveness.

[0057] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A cooling system for an energy storage power station, characterized in that: include: The first liquid cooling device comprises a first heat exchange pipeline, a refrigeration circuit and a fan, wherein the first heat exchange pipeline is suitable for being connected to the prefabricated cabin and exchanging heat with the battery cluster in the prefabricated cabin; the refrigeration circuit comprises a heat exchanger, a compressor and a condenser connected in sequence, the first heat exchange pipeline passes through the heat exchanger, and the refrigerant in the refrigeration circuit and the first coolant in the first heat exchange pipeline exchange heat in the heat exchanger; The second liquid cooling device comprises a second heat exchange pipeline, the second heat exchange pipeline is suitable for being connected to the electrical equipment and exchanging heat with the electrical equipment, a second heat dissipation portion is arranged on the second heat exchange pipeline, a second coolant in the second heat exchange pipeline dissipates heat through the second heat dissipation portion, and the second heat dissipation portion is arranged corresponding to the condenser; The fan is arranged corresponding to the condenser and the second heat dissipation part to cool the condenser and the second heat dissipation part.

2. The energy storage power station cooling system according to claim 1, characterized in that: The first heat exchange pipeline has a first inlet and a first outlet, the first inlet is suitable for communicating with the liquid outlet of the prefabricated cabin, and the first outlet is suitable for communicating with the corresponding liquid inlet on the prefabricated cabin, and the number of the prefabricated cabins is one or more.

3. The energy storage power station cooling system according to claim 1, characterized in that: The first heat exchange pipeline includes a heat exchange branch and a heat dissipation branch connected in parallel. The heat exchange branch passes through the heat exchanger. The heat dissipation branch is provided with a first heat dissipation part. The first coolant in the heat dissipation branch dissipates heat through the first heat dissipation part.

4. The energy storage power station cooling system according to claim 3, characterized in that: The condenser, the first heat dissipation part and the second heat dissipation part are arranged in sequence.

5. The energy storage power station cooling system according to claim 4, characterized in that: The fan is arranged on a side of the condenser away from the first heat dissipation portion to provide wind force from the second heat dissipation portion toward the condenser.

6. The energy storage power station cooling system according to claim 3, characterized in that: The first heat dissipation part is a cooling coil; and / or the second heat dissipation part is a cooling coil.

7. The energy storage power station cooling system according to claim 1, characterized in that: The first heat exchange pipeline is provided with a first circulation pump, and the first circulation pump provides power for the flow of the first coolant; the second heat exchange pipeline is provided with a second circulation pump, and the second circulation pump provides power for the flow of the second coolant.

8. The energy storage power station cooling system according to claim 1, characterized in that: The refrigeration circuit also includes: An expansion valve, wherein the condenser, the expansion valve and the heat exchanger are connected in sequence, and the expansion valve converts the refrigerant from a liquid state to a vapor state; And / or, a one-way valve, wherein the one-way valve is arranged between the compressor and the condenser.

9. The energy storage power station cooling system according to any one of claims 1 to 8, characterized in that: The first liquid cooling device further includes: an expansion tank connected to the first heat exchange pipeline to adjust the liquid pressure in the first heat exchange pipeline.

10. The energy storage power station cooling system according to claim 2, characterized in that: The first liquid cooling device also includes: a temperature sensor, the temperature sensor being disposed on a pipeline between the heat exchanger and the first outlet to detect a temperature of the first coolant after passing through the heat exchanger; and / or, a heater connected to a pipeline between the first inlet and the heat exchanger, the heater selectively heating the first coolant.

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