Energy storage battery cooling system for large-scale photovoltaic power generation

Abstract

The invention discloses an energy storage battery cooling system for large-scale photovoltaic power generation, and the system comprises a power supply energy storage cabinet which is internally provided with a battery cabin and a cooling cabin at the upper part and the lower part respectively; the battery rack is fixed in the battery compartment; the cooling plate devices are arranged in the battery rack and are distributed between two adjacent photovoltaic energy storage batteries at intervals; the cooling unit is arranged in the cooling bin, and a first liquid storage tank and a second liquid storage tank are arranged in the cooling unit; and the air cavity is arranged in the power supply energy storage cabinet and is positioned behind the battery rack. A plurality of cooling plate devices are arranged on the battery rack and can conduct heat on the photovoltaic energy storage battery in a contact mode, and rapid cooling is achieved; wherein a cooling unit in the cooling bin adopts a first liquid storage tank and a second liquid storage tank, a low-boiling-point refrigerant and a high-specific-heat-capacity water-based solution are stored in the first liquid storage tank and the second liquid storage tank respectively, and only one or two cooling media can be adopted, so that a cooling strategy can be dynamically adjusted according to the real-time temperature, thermal load distribution and the like of the photovoltaic energy storage battery.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of high-power electrical equipment cooling, and particularly relates to a large photovoltaic power generation energy storage battery cooling system. BACKGROUND

[0002] At present, the battery energy storage system used in photovoltaic power generation generally selects air cooling or liquid cooling. The air cooling is mainly forced air cooling by using flowing air to reduce the battery temperature, but the cooling coefficient of air is small, and the heat dissipation is poor due to the high arrangement density of the battery, and the single forced air cooling system cannot meet the thermal safety requirement; Although the single cooling liquid structure of most liquid cooling systems is stable in temperature reduction and heat conduction, it is easy to cause insufficient cooling when coping with the instantaneous huge heat load of high-rate charging and discharging of large energy storage batteries, resulting in thermal runaway of the energy storage battery.

[0003] Therefore, it is necessary to provide a large photovoltaic power generation energy storage battery cooling system to solve the problems in the background art. SUMMARY

[0004] To achieve the above-mentioned purpose, the application provides the following technical scheme: a large photovoltaic power generation energy storage battery cooling system, comprising: A power energy storage cabinet, the inside of which is divided into a battery compartment and a cooling compartment from top to bottom; A battery rack fixed in the battery compartment; A cooling plate device arranged in the battery rack and distributed between adjacent two photovoltaic energy storage batteries; A cooling unit arranged in the cooling compartment, the cooling unit is provided with a first liquid storage tank and a second liquid storage tank, and the first liquid storage tank and the second liquid storage tank are connected with each cooling plate device; An air cavity arranged in the power energy storage cabinet and located behind the battery rack.

[0005] Further, as a preferred, a partition plate is vertically fixed in the cooling compartment, the air cavity is located between the partition plate and the back plate of the power energy storage cabinet, a plurality of strip-shaped air holes are formed in the back plate, and an exhaust fan is installed in the air cavity; A positioning groove is formed in the partition plate, a grating plate is fixed in the positioning groove, a dustproof air inlet is formed in the outer wall of the power energy storage cabinet, and the dustproof air inlet is in communication with the air cavity.

[0006] Further, as a preferred, the cooling unit comprises: A fixed frame fixed in the cooling compartment, the first liquid storage tank and the second liquid storage tank are vertically installed on one side of the fixed frame; A butterfly valve is installed at the liquid outlet of the first and second liquid storage tanks, and a liquid delivery pipe is connected to the other end of the butterfly valve. A liquid storage tank is fixed in the fixed frame, and a collecting pipe is connected to the liquid storage tank, and the other end of the collecting pipe is connected to each cooling plate device. A condenser is installed on the fixed frame near the liquid storage tank, a liquid pump is connected to the condenser, and the other end of the liquid pump is connected to the liquid storage tank through an outer pipe. Two liquid discharge pipes are connected to the condenser, and the two liquid discharge pipes are connected to the first and second liquid storage tanks, respectively.

[0007] Further, as a preferred, the liquid storage tank is provided with two independent cavities, and the two cavities correspond to the storage of the cooling medium of the first and second liquid storage tanks, respectively.

[0008] Further, as a preferred, the first liquid storage tank uses a low-boiling-point refrigerant, and the second liquid storage tank uses a high-specific-heat water-based solution.

[0009] Further, as a preferred, the cooling plate device comprises: A heat-conducting plate has a plurality of mounting grooves arranged and distributed in the width direction inside the heat-conducting plate; A cooling pipe is provided corresponding to each mounting groove, and the cooling pipe is coaxially fixed in the mounting groove; A pipe support is symmetrically fixed at both ends of the cooling pipe; A first conduit and a second conduit are respectively connected to the left and right sides of the cooling pipe, the other end of the first conduit is connected to the first liquid storage tank, and the second conduit is connected to the second liquid storage tank.

[0010] Further, as a preferred, a valve plug is sealingly and slidingly connected in the cooling pipe, two connecting shafts are symmetrically provided at both ends of the valve plug, and a plurality of flow guide holes are formed in the connecting shafts; An inner channel is provided in the center of the connecting shaft, the flow guide holes are connected to the inner channel, and a return pipe is sealingly connected to the outside of each connecting shaft, and one end of the return pipe is connected to the inner channel.

[0011] Further, as a preferred, a top shaft is fixed at one end of the connecting shaft, the top shaft is slidingly connected in the valve plug, a plurality of inclined blocks are distributed on the circumferential side wall of both ends of the valve plug, the top shaft is in abutting contact with the inclined blocks, and a cleaning ring is provided outside the valve plug.

[0012] Further, as a preferred, the contact surface of the top shaft and the inclined block is provided as an inclined surface structure, and a compression spring is connected between the top shaft and the valve plug.

[0013] Further, as a preferred, a shut-off valve is provided on the return pipe.

[0014] Compared with the prior art, the present application has the following advantages: In the present application, the battery compartment and the cooling compartment are arranged in the power storage cabinet respectively, the photovoltaic energy storage battery can be placed in the battery compartment through the battery rack, and a plurality of cooling plate devices are arranged on the battery rack, which can contact and heat the photovoltaic energy storage battery to achieve rapid cooling; the cooling unit in the cooling compartment adopts a first liquid storage tank and a second liquid storage tank, which respectively store low-boiling-point refrigerant and high-specific-heat water-based solution, and the two cooling media flow into the cooling pipes through the first conduit and the second conduit, so that in different use environments, on the one hand, only one of the two cooling media can be used for cooling, and the plurality of cooling pipes can realize efficient cooling or temperature stabilization of the photovoltaic energy storage battery, and on the other hand, the two cooling media can be used simultaneously and the flow length ratio of the two cooling media in each cooling pipe can be accurately adjusted, so that the cooling strategy can be dynamically adjusted according to the real-time temperature and heat load distribution of the photovoltaic energy storage battery. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present application; Figure 2 It is a front view of the present application; Figure 3 It is a schematic diagram of the structure of the cooling unit and the air cavity in the present application; Figure 4 It is a schematic diagram of the structure of the cooling plate device in the present application; Figure 5 It is a sectional view of the internal structure of the heat conduction plate in the present application; Figure 6 It is a schematic diagram of the structure of the valve plug in the present application; In the figure: 1, power storage cabinet; 11, battery rack; 2, cooling plate device; 21, heat conduction plate; 22, cooling pipe; 23, pipe rack; 24, first conduit; 25, second conduit; 3, cooling unit; 31, first liquid storage tank; 32, second liquid storage tank; 33, fixed frame; 34, butterfly valve; 35, liquid delivery pipe; 36, liquid storage tank; 37, condenser; 38, liquid pump; 39, outer pipe; 310, liquid discharge pipe; 4, air cavity; 41, partition; 42, strip-shaped air hole; 43, exhaust fan; 44, positioning groove; 45, dustproof air inlet; 5, valve plug; 51, connecting shaft; 52, flow guide hole; 53, inner channel; 54, return pipe; 55, top shaft; 56, cleaning ring; 57, intercepting valve. DETAILED DESCRIPTION

[0016] Please refer to Figures 1-6 In the embodiment of the present application, a large-scale photovoltaic power generation energy storage battery cooling system comprises: The power storage cabinet 1 is internally arranged as a battery compartment and a cooling compartment from top to bottom; Battery rack 11, fixed in the battery compartment, photovoltaic energy storage battery arranged in the battery rack 11; Cooling plate device 2, arranged in the battery rack 11 and spaced between two adjacent photovoltaic energy storage batteries, the cooling plate device 2 can be in full contact with the two photovoltaic energy storage batteries above and below to conduct heat, thereby realizing cooling; Cooling unit 3, provided in the cooling compartment, the first storage tank 31 and the second storage tank 32 are provided in the cooling unit 3, and the first storage tank 31 and the second storage tank 32 are connected with each cooling plate device 2, thereby conveying low-temperature cooling medium for the cooling plate device 2; Wind cavity 4, provided in the power storage cabinet 1 and located behind the battery rack 11, the wind cavity 4 can assist in providing air cooling for the battery compartment in the power storage cabinet 1, and the heat dissipation efficiency is high.

[0017] In this embodiment, the cooling compartment is vertically fixed with a partition plate 41, the wind cavity 4 is located between the partition plate 41 and the back plate of the power storage cabinet 1, a plurality of strip-shaped air holes 42 are formed on the back plate, and an exhaust fan 43 is installed in the wind cavity 4, which can send external low-temperature air into the wind cavity 4 through the strip-shaped air holes 42 when working; The partition plate 41 is provided with a positioning groove 44, and a grille plate is fixed in the positioning groove 44, the high-temperature heat flow in the battery compartment can enter the wind cavity 4 through the grille plate, thereby converging with the low-temperature air in the wind cavity 4, and a dustproof air inlet 45 is formed on the outer wall of the power storage cabinet 1, which is in communication with the wind cavity 4, and can quickly discharge the high-temperature heat flow in the wind cavity 4.

[0018] As a preferred embodiment, the cooling unit 3 comprises: The fixed frame 33 is fixed in the cooling compartment, and the first storage tank 31 and the second storage tank 32 are vertically installed on one side of the fixed frame 33; The butterfly valve 34 is installed at the liquid outlet of the first storage tank 31 and the second storage tank 32, which can effectively control the output flow of the cooling medium, and the other end of the butterfly valve 34 is connected with the liquid conveying pipe 35, wherein a liquid pump system is connected outside each liquid conveying pipe 35, which can convey the cooling medium in the first storage tank 31 and the second storage tank 32 to the cooling plate device 2 through the corresponding liquid conveying pipe 35; The liquid storage tank 36 is fixed in the fixed frame 31, and the liquid storage tank 36 is connected with the liquid collecting pipe, and the other end of the liquid collecting pipe is connected with each cooling plate device 2, and the liquid storage tank 36 is mainly used for collecting the high-temperature cooling medium discharged through the cooling plate device 2, and the liquid collecting pipe can convey it to the liquid storage tank 36 for temporary storage; A condenser 37 is installed on the fixed frame 31 near one side of the liquid storage tank 36, a liquid pump 38 is connected to the condenser 37, the other end of the liquid pump 38 is connected to the liquid storage tank 36 through an outer pipe 39, the liquid pump 38 can transport the cooling medium stored in the liquid storage tank 36 to the condenser 37 during work, and the condenser 37 is equipped with a powerful fan with high power and high protection level (such as IP68) to enhance forced convection and realize rapid cooling of the cooling medium; the condenser 37 is externally connected with two liquid discharge pipes 310, and the two liquid discharge pipes 310 are respectively connected with the first liquid storage tank 31 and the second liquid storage tank 32, so that the regenerated cooling medium after cooling treatment can enter the first liquid storage tank 31 and the second liquid storage tank 32 through the corresponding liquid discharge pipes 310.

[0019] In the embodiment, the liquid storage tank 36 is provided with two independent cavities, and the two cavities correspond to store the cooling medium of the first liquid storage tank 31 and the second liquid storage tank 32 respectively, so as to avoid mixing of the two kinds of cooling medium and maintain the optimal original thermal physical properties of the cooling medium.

[0020] In the embodiment, low-boiling-point refrigerant is used in the first liquid storage tank 31, and high-specific-heat-capacity water-based solution is used in the second liquid storage tank 32. Specifically, the low-boiling-point refrigerant has fast heat absorption and release speed and is good at handling the peak heat load generated by instantaneous high-rate charging and discharging. Its phase change heat absorption feature can quickly remove a large amount of heat to prevent local overheating of the photovoltaic energy storage battery and greatly improve the ability of the system to respond to sudden power fluctuations (such as rapid movement of cloud layers and sudden changes in load); The high-specific-heat-capacity water-based solution has stable heat absorption and release and can be used to handle continuous and stable basic heat load. The high specific heat capacity can smoothly and efficiently absorb the continuous heat generated by the battery during normal operation, maintaining the uniform and stable overall temperature of the battery compartment. Therefore, in the cooling system, one or both of the cooling media can be used for battery cooling according to the specific working environment. Further, in the case of strong sunlight during summer noon, the photovoltaic output is large, the battery charging rate is high, and the heat load is large. The system can increase the proportion of low-boiling-point refrigerant or even fully open it to start the powerful phase change cooling mode.

[0021] In the embodiment, the cooling plate device 2 comprises: A heat conduction plate 21, which is internally arranged and distributed with a plurality of mounting grooves in the width direction; A cooling pipe 22, which is arranged one by one corresponding to each mounting groove, and is coaxially fixed in the mounting groove; A pipe bracket 23, which is symmetrically fixed at both ends of the cooling pipe 22; The first conduit 24 and the second conduit 25 are respectively connected to the left and right sides of the cooling pipe 22, the other end of the first conduit 24 is communicated with the first liquid storage tank 31, and the second conduit 25 is communicated with the second liquid storage tank 32, specifically, the first conduit 24 is sealed and connected with the liquid conveying pipe 35 on the first liquid storage tank 31, so that the low-boiling-point refrigerant can flow into the cooling pipe 22 through the first conduit 24; and the second conduit 25 is sealed and connected with the liquid conveying pipe 35 on the second liquid storage tank 32, so that the high specific heat water-based solution can enter the cooling pipe 22 through the second conduit 25, and the two cooling media flow into the cooling pipe 22 from the two ends of the cooling pipe 22 respectively, and do not interfere with each other. In addition, the cooling pipe 22, the first conduit 24 and the second conduit 25 can be further arranged with heat dissipation fins outside, so that the heat dissipation capacity and overall thermal management efficiency of the system are greatly improved.

[0022] As a preferred embodiment, the valve plug 5 is sealingly and slidingly connected in the cooling pipe 22, the two ends of the valve plug 5 are respectively and symmetrically provided with connecting shafts 51, and a plurality of flow guide holes 52 are formed in the connecting shafts 51; the valve plug 5 can divide the cooling pipe 22 into two pipe cavities, and the two cooling media flow in the corresponding pipe cavities respectively; when the valve plug 5 is in the middle of the cooling pipe 22, the overall length of the two pipe cavities is the same, at this time, the flow path length of the two cooling media is 1:1, and when the valve plug 5 moves to one side, the flow path of one kind of cooling medium is lengthened, and the other kind of cooling medium is correspondingly shortened; in the conventional environment, the flow path of the low-boiling-point refrigerant is only one fifth or less than one fifth of the flow path length of the high specific heat water-based solution, so that the cooling plate device 2 can use the high specific heat water-based solution as the main cooling medium for stable cooling, and when the thermal load of the photovoltaic energy storage battery becomes large, the low-boiling-point refrigerant can also flow immediately and expand the flow path to realize rapid response cooling; in the high-temperature environment such as desert, the high specific heat water-based solution is still used as the main cooling medium for stable cooling, but the flow path of the low-boiling-point refrigerant is two-thirds of the flow path length of the high specific heat water-based solution, so that the low-boiling-point refrigerant can realize instantaneous response flow in the face of the sharp change of temperature and the sudden high thermal load in the desert, so that the system realizes rapid and smooth temperature control whether it is to cope with the extreme high temperature in the afternoon or to deal with the sudden change of photovoltaic power caused by the movement of cloud layer, and avoids the thermal runaway of the photovoltaic energy storage battery. In addition, by independently controlling and adjusting the valve plug 5 in each cooling pipe 22, the distribution of the two cooling media in the heat conduction plate 21 can also be changed as a whole, so that the low-boiling-point refrigerant in the corresponding cooling pipe 22 can be used as the main cooling medium in the heat concentration area of the photovoltaic energy storage battery, so that the flow path is greater than that of the high specific heat water-based solution.

[0023] The inner center of the connecting shaft 51 is provided with an inner channel 53, the flow guide holes 52 are all communicated with the inner channel 53, the outer of each connecting shaft 51 is sealingly connected with a return pipe 54, one end of the return pipe 54 is connected with the inner channel 53, that is, the cooling medium entering the cooling pipe 22 through the first conduit 24 and the second conduit 25 flows into the flow guide holes 52 at the connecting shaft 51, and then flows into the return pipe 54 from the inner channel 53, the other end of the return pipe 54 is communicated with the collecting pipe on the liquid storage tank 36, so that the cooling medium directly enters the liquid storage tank 36 through the collecting pipe; In the embodiment, one end of the connecting shaft 51 is fixed with a top shaft 55, the top shaft 55 is slidingly connected in the valve plug 5, the two ends of the valve plug 5 are provided with a plurality of inclined blocks distributed on the circumferential side wall, the top shaft 55 is in abutting contact with the inclined blocks, and the valve plug 5 is provided with a cleaning ring 56, which can slide with the valve plug 5 to clean the inner wall of the cooling pipe 22, so as to avoid the mixing of the two cooling media.

[0024] In the embodiment, the contact surface of the top shaft 55 and the inclined block is provided as a bevel structure, and the top shaft 55 is connected with a compression spring between the valve plug 5, so that when the valve plug 5 slides to one side, the top shaft 55 and the valve plug 5 slide relatively, the top shaft 55 radially pushes out the plurality of inclined blocks, at this time, the cleaning ring 56 outside the inclined block is extruded and fully contacts with the inner wall of the cooling pipe 22, the contact pressure is large, and the cleaning effect is good.

[0025] In the embodiment, the return pipe 54 is provided with a shut-off valve 57; specifically, in general working, the shut-off valves 57 on the two return pipes 54 are all in the open state, and the two cooling media can enter the cooling pipe 22 and then circulate back through the return pipe 54; when it is necessary to adjust the size of the flow path of the two cooling media, the shut-off valve 57 outside the cooling medium with a larger flow path is closed (the other is in the open state), at this time, the cooling medium entering the cooling pipe 22 cannot be discharged through the return pipe 54, so that the cooling medium hydraulic pressure can push the valve plug 5 to slide, in the sliding process, the two compression springs are compressed, and the two cleaning rings clean at the same time, when reaching the specified position, the shut-off valve 57 is opened, so as to realize the accurate adjustment of the size of the flow path of the two cooling media.

[0026] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can make equivalent replacement or change according to the technical solution and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A cooling system for a large-scale photovoltaic power generation energy storage battery, characterized in that, It includes: The power storage cabinet (1) has a battery compartment and a cooling compartment located on the top and bottom, respectively. Battery rack (11) is fixed inside the battery compartment; Cooling plate devices (2) are arranged in the battery rack (11) and spaced apart between two adjacent photovoltaic energy storage batteries; A cooling unit (3) is installed in a cooling chamber. The cooling unit (3) is equipped with a first liquid storage tank (31) and a second liquid storage tank (32). The first liquid storage tank (31) and the second liquid storage tank (32) are both connected to each of the cooling plate devices (2). The air cavity (4) is located in the power storage cabinet (1) and behind the battery rack (11).

2. The cooling system for a large-scale photovoltaic power generation energy storage battery according to claim 1, characterized in that: A partition (41) is vertically fixed inside the cooling chamber. The air cavity (4) is located between the partition (41) and the back plate of the power storage cabinet (1). Multiple strip-shaped air holes (42) are opened on the back plate, and an exhaust fan (43) is installed inside the air cavity (4). The partition (41) is provided with a positioning groove (44), and a grid plate is fixed in the positioning groove (44). The outer wall of the power storage cabinet (1) is provided with a dustproof air vent (45), and the dustproof air vent (45) is connected to the air cavity (4).

3. The cooling system for a large-scale photovoltaic power generation energy storage battery according to claim 1, characterized in that, The cooling unit (3) includes: A fixed frame (33) is fixed in the cooling chamber, and the first liquid storage tank (31) and the second liquid storage tank (32) are vertically installed on one side of the fixed frame (33); A butterfly valve (34) is installed at the drain port of the first liquid storage tank (31) and the second liquid storage tank (32), and the other end of the butterfly valve (34) is connected to a delivery pipe (35). A liquid storage tank (36) is fixed in a fixed frame (31). A manifold is connected to the liquid storage tank (36), and the other end of the manifold is connected to each cooling plate device (2). A condenser (37) is installed on a fixed frame (31) on one side near the liquid storage tank (36). A liquid pump (38) is connected to the condenser (37). The other end of the liquid pump (38) is connected to the liquid storage tank (36) through an outer pipe (39). Two drain pipes (310) are connected to the outside of the condenser (37). The two drain pipes (310) are respectively connected to the first liquid storage tank (31) and the second liquid storage tank (32).

4. The cooling system for a large-scale photovoltaic power generation energy storage battery according to claim 3, characterized in that: The liquid storage tank (36) is provided with two independent cavities, which respectively store the cooling medium of the first liquid storage tank (31) and the second liquid storage tank (32).

5. A cooling system for a large-scale photovoltaic power generation energy storage battery according to claim 3, characterized in that: The first liquid storage tank (31) uses a low-boiling-point refrigerant, and the second liquid storage tank (32) uses a high specific heat capacity water-based solution.

6. A cooling system for a large-scale photovoltaic power generation energy storage battery according to claim 1, characterized in that, The cooling plate device (2) includes: The heat-conducting plate (21) has multiple mounting grooves arranged along its width inside; Cooling pipes (22) are provided one-to-one with each of the mounting slots, and the cooling pipes (22) are coaxially fixed in the mounting slots; The tube rack (23) is symmetrically fixed at both ends of the cooling tube (22); The first conduit (24) and the second conduit (25) are respectively connected to the left and right sides of the cooling pipe (22). The other end of the first conduit (24) is connected to the first liquid storage tank (31), and the second conduit (25) is connected to the second liquid storage tank (32).

7. A cooling system for a large-scale photovoltaic power generation energy storage battery according to claim 6, characterized in that: The cooling pipe (22) is sealed and slidably connected with a valve plug (5). The two ends of the valve plug (5) are respectively symmetrically provided with connecting shafts (51). Multiple guide holes (52) are opened on the connecting shafts (51). The connecting shaft (51) has an inner channel (53) at its center. The guide holes (52) are all connected to the inner channel (53). Each connecting shaft (51) is sealed with a return pipe (54), and one end of the return pipe (54) is connected to the inner channel (53).

8. A cooling system for a large-scale photovoltaic power generation energy storage battery according to claim 7, characterized in that: One end of each connecting shaft (51) is fixed with a top shaft (55), which is slidably connected inside the valve plug (5). Several inclined blocks are distributed on the circumferential sidewalls at both ends of the valve plug (5). The top shaft (55) abuts against the inclined blocks. A cleaning ring (56) is provided on the outer sleeve of the valve plug (5).

9. A cooling system for a large-scale photovoltaic power generation energy storage battery according to claim 8, characterized in that: The contact surface between the top shaft (55) and the inclined block is set as an inclined structure, and a compression spring is connected between the top shaft (55) and the valve plug (5).

10. A cooling system for a large-scale photovoltaic power generation energy storage battery according to claim 7, characterized in that: Each of the return pipes (54) is equipped with a shut-off valve (57).

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