A battery box heat dissipation structure for a photovoltaic power storage conversion system based on a microgrid

Abstract

The present application relates to a technical field of photovoltaic heating, and in particular to a battery box heat dissipation structure of a photovoltaic power conversion system based on a microgrid, which includes a battery box, which is arranged in a vertical cylindrical shape, and multiple layers of storage batteries are arranged inside the battery box, and each layer of storage batteries is evenly arranged along the peripheral wall of the battery box. A spray device is arranged inside the battery box, and the spray device is connected to a water pump for passing water into the spray device. An exhaust fan is connected to one end of the battery box, and a vertical channel is formed between the side walls of two adjacent storage batteries, and a central channel is formed in the middle of each layer of storage batteries. The water mist formed by the spray device passes through each layer of storage batteries in sequence from one end of the battery box through the airflow formed by the exhaust fan. The present application has the effect of reducing the surface temperature of the battery during operation.

Description

Technical Field

[0001] The present application relates to the technical field of photovoltaic heating, and in particular to a battery box heat dissipation structure of a photovoltaic energy storage and conversion system based on a microgrid. Background Art

[0002] Photovoltaic heating is the use of photovoltaic panels to generate electricity, which is then inverted to heat electric heaters or heating water. During the day, the excess electricity can be stored in batteries, which can be used for time-sharing heating. This reduces the fossil energy consumed for heating in the community and reduces carbon dioxide emissions. There are a small number of microgrids in the internal management of the community. Microgrids are small power distribution systems composed of distributed power sources, energy storage devices, and energy conversion devices. Microgrids can be configured using the space of the community. Distributed power sources can generate electricity for photovoltaic panels, and then use energy storage devices for heating, thereby reducing the consumption of fossil energy during the heating season and reducing the heat loss caused by long-distance transmission. In the summer, the microgrid generates electricity through photovoltaic panels and enters the energy storage device. When the power consumption is relatively large, the energy storage device can provide electricity to the community, so that the power generated by photovoltaic panels can also create profits for the community. The energy storage device stores the electric energy generated by photovoltaic power generation. The energy storage device usually adopts batteries. More batteries are arranged to store more electricity. Multiple batteries form a battery pack. However, the batteries in the battery pack will generate heat during the charging and discharging process. When the heat is not discharged in time, the temperature of the battery surface rises, which can easily affect its service life. Summary of the invention

[0003] In order to reduce the surface temperature of the battery during operation, the present application provides a battery box heat dissipation structure of a photovoltaic power conversion system based on a microgrid.

[0004] The present application provides a battery box heat dissipation structure of a photovoltaic power storage conversion system based on a microgrid, which adopts the following technical solutions:

[0005] A battery box heat dissipation structure of a photovoltaic power conversion system based on a microgrid includes a battery box, which is arranged in a vertical cylindrical shape. Multiple layers of batteries are arranged inside the battery box, and each layer of batteries is evenly arranged along the peripheral wall of the battery box. A spray device is arranged inside the battery box, and the spray device is connected to a water pump for passing water into the spray device. An exhaust fan is connected to one end of the battery box, and a vertical channel is formed between the side walls of two adjacent batteries. A central channel is formed in the middle of each layer of batteries. The water mist formed by the spray device passes through each layer of batteries in sequence from one end of the battery box through the airflow formed by the exhaust fan.

[0006] By adopting the above technical scheme, when in use, the battery box is set to a vertical cylindrical shape, and multiple layers of batteries are arranged in the battery box, and each layer of batteries is evenly arranged on the peripheral wall of the battery box. When the spray device inside the battery box sprays water mist into the battery box, the water mist contacts the batteries in the battery box, so that the water mist absorbs the heat on the surface of the batteries. At the same time, since the exhaust fan is connected to one end of the battery box, airflow passes through the vertical channel and the central channel. When the airflow passes through the water stuck to the surface of the battery, the water will actively absorb the heat on the surface of the battery due to accelerated evaporation, thereby cooling the battery. At the same time, since the exhaust fan moves the airflow inside the battery box in a single direction, all batteries in the battery box can be cooled, thereby achieving the effect of reducing the surface temperature of the battery during operation.

[0007] Preferably, a metal connecting piece is fixedly provided on the pole of the battery, and the outside of the connection between the metal connecting piece and the pole is insulated and protected by applying insulating glue or spraying insulating paint, a metal heat conducting plate is provided above each layer of the battery, an insulating heat conducting plate is provided in the middle of the metal connecting piece, and heat is conducted between the metal connecting piece and the metal heat conducting plate through the insulating heat conducting plate, and the metal heat conducting plate is a hollow structure.

[0008] By adopting the above technical solution, the battery pole has good thermal conductivity with the interior of the battery because of the metal material used. When the metal connecting piece is connected to the battery pole, the temperature of the metal connecting piece will also be higher. Since the metal heat conductive plate and the metal connecting piece are connected through the insulating heat conductive plate, the metal heat conductive plate can dissipate the heat on the metal connecting piece through the metal heat conductive plate after being cooled by contact with water mist, thereby improving the cooling effect on the interior of the battery.

[0009] Preferably, the spray device includes a main pipe and multiple branch pipes, the main pipe is located in the middle of the central channel, one end of the main pipe is connected to the water pump, one end of the branch pipe is fixed to and connected to the main pipe, the other end of the branch pipe is fixed to the inner wall of the battery box and multiple spray points are arranged along the length direction of the branch pipe.

[0010] By adopting the above technical solution, the main pipe is located in the middle of the central channel, and the water pump adds water into the main pipe and sprays it out from the spray points on multiple branch pipes, so that the branch pipes can distribute the water mist formed in the battery box more evenly, and at the same time fix the main pipe inside the battery box through the branch pipes.

[0011] Preferably, a stirring device is provided inside the central channel, and the stirring device includes a rotating ring, a driving blade and a stirring blade. The rotating ring is rotatably set on the main pipe, and the driving blade and the stirring blade are both fixed on the peripheral wall of the rotating ring. The driving blade is inclined to the center line of the central channel, and the stirring blade is vertically set and extends along the radial direction of the battery box.

[0012] By adopting the above technical solution, the rotating ring is rotatably set on the main pipe. When the airflow passes through the central channel, the airflow will generate thrust on the driving blades, causing the driving blades to rotate, and then the stirring blades will fan the airflow radially, so that the water mist can be distributed more evenly in the battery box.

[0013] Preferably, a mounting position is provided on the inner wall of the battery box, and the mounting position is formed by four baffles arranged in a rectangular shape. The battery is inserted between the four baffles, and a fixing part is provided inside the battery box, which is used to abut the side of the battery away from the mounting position.

[0014] By adopting the above technical solution, the battery is connected to the middle of the four baffles by insertion. When the battery needs maintenance or is damaged, the fixing part is moved away from the side of the battery away from the installation position, and then the battery is removed from the baffle, making it easier to disassemble the battery.

[0015] Preferably, the fixing member includes a ring body and an abutment column, the ring body is coaxially arranged with the battery box, the ring body and the battery box are relatively rotatably connected, the abutment column is fixed on the surface of the ring body and extends toward the side of the battery, the abutment column is used to abut against a side of the battery away from the installation position, and the distance between two adjacent batteries on the same layer is greater than the width of the abutment column.

[0016] By adopting the above technical solution, the ring body and the battery box are coaxially arranged, and the ring body and the battery box are connected for relative rotation. When the ring body rotates, the abutment column rotates with the ring body, so that when the abutment column is on the side of the battery away from the installation position, the abutment column blocks the battery. When the battery needs to be disassembled, the abutment column is rotated to a position between the two batteries, so that the battery can be easily removed from the installation position.

[0017] Preferably, filter cotton is provided at the bottom of the battery box, and a collecting device is provided above the filter cotton, the collecting device includes a plurality of inclined plates, the lower side of the inclined plate is provided with an upwardly inclined rib, a notch is provided on the rib, and a confluence groove opposite to the notch is provided below the inclined plate, the confluence groove is used to receive water flowing out of the notch, and the vertical projections of two adjacent inclined plates overlap each other.

[0018] By adopting the above technical solution, filter cotton is arranged at the bottom of the battery box. When the air is filtered by the filter cotton, it can reduce the dust from entering the battery box and sticking to the surface of the battery, thereby affecting the heat dissipation of the battery. At the same time, when water droplets fall in the battery box, the water droplets will fall onto the inclined plate and be collected by the confluence groove to avoid poor filtering effect after the filter cotton is soaked in water.

[0019] Preferably, a water tank is provided at the bottom of the battery box, the top surface of the water tank is connected to the bottom end of the battery box, and a plurality of air filters are provided on the water tank, and the air enters the water tank through the air filters.

[0020] By adopting the above technical solution, a water tank is arranged at the bottom of the battery box, the top surface of the water tank is connected to the battery box, and an air filter is installed on the water tank, so that when the air enters the battery box, it first passes through the air filter and then is filtered through the filter cotton, thereby reducing the filtering pressure on the filter cotton. At the same time, the air filter is also relatively convenient to replace. When the air enters the water tank, it can also take away the steam in the water tank in time, thereby cooling the water in the water tank.

[0021] Preferably, the water pump is arranged in a water tank, a drain pipe is arranged on the confluence trough, one end of the drain pipe leads into the water tank, and the other end is connected with the confluence trough.

[0022] By adopting the above technical solution, a drainage pipe is arranged on the confluence trough, and the drainage pipe recycles water from the confluence trough into the water tank, thereby reducing the waste of water resources caused by the water droplet formation process.

[0023] Preferably, the upper end of the battery box is sequentially connected to at least one other battery box, and then connected to the exhaust fan via a connecting pipe.

[0024] By adopting the above technical solution, other battery boxes are connected to the battery box, so that the same exhaust fan can be connected to different numbers of battery boxes. The batteries in the battery box also have different capacities according to the number of battery boxes, thereby providing modular configuration for different communities and having a wide range of applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0026] Figure 2 This is a schematic diagram of the structure of a battery box and a water tank cut away in an embodiment of the present application;

[0027] Figure 3 is a schematic diagram of the position of the collecting device in the embodiment of the present application;

[0028] Figure 4 is a connection diagram of a battery in an embodiment of the present application;

[0029] Figure 5 is a schematic diagram of the installation of the metal heat conducting plate in the embodiment of the present application;

[0030] Figure 6 is a schematic diagram of the structure of the spray device in the embodiment of the present application;

[0031] Figure 7It is a schematic diagram of the structure of the fixing member in the embodiment of the present application.

[0032] Explanation of the reference numerals: 1. battery box; 11. filter cotton; 2. storage battery; 21. pole; 23. metal connecting piece; 231. connecting bolt; 24. insulating heat conductive sheet; 25. metal heat conductive plate; 251. clearance port; 26. screw; 27. mounting ear; 3. connecting pipe; 31. exhaust fan; 4. water tank; 41. water pump; 42. air filter; 5. spray device; 51. main pipe; 52. branch pipe; 53. spray point; 6. mounting position; 61. baffle; 7. collecting device; 71. inclined plate; 72. rib; 73. notch; 74. confluence trough; 75. drain pipe; 81. vertical channel; 82. central channel; 9. stirring device; 91. rotating ring; 92. driving blade; 93. stirring blade; 10. fixing piece; 101. ring body; 102. abutting column; 103. ring groove. DETAILED DESCRIPTION

[0033] The following is combined with Figure 1-7 This application is described in further detail.

[0034] The present application embodiment discloses a battery box heat dissipation structure of a photovoltaic energy storage conversion system based on a microgrid, referring to Figure 1 and Figure 2 , including a battery box 1, the battery box 1 is a cylindrical structure as a whole, and a plurality of storage batteries 2 are arranged inside the battery box 1, and the storage batteries 2 are arranged in layers. The cylindrical battery box 1 is arranged vertically, and each layer of storage batteries 2 forms a group. Two adjacent groups of storage batteries 2 are arranged up and down, and the storage batteries 2 are a rectangular parallelepiped structure as a whole. A connecting pipe 3 is connected to the top of the battery box 1, and the connecting pipe 3 is used to install an exhaust fan 31. At the same time, multiple battery boxes 1 can be arranged in a vertical direction as needed, and then the connecting pipe 3 is installed. The exhaust fan 31 can select different powers as needed, and then the same exhaust fan 31 is used to cool down the multiple battery boxes 1, and it can match the needs of obtaining different capacities. The lower part of the battery box 1 also has an opening, so that the exhaust fan 31 ventilates vertically upward from the lower part of the battery box 1, thereby cooling down the multiple storage batteries 2 in the battery box 1.

[0035] A water tank 4 is provided at the bottom of the battery box 1. The water tank 4 is used to store an aqueous solution. The aqueous solution can be filtered through a permeable membrane to reduce the salt ions in the aqueous solution. A water pump 41 is provided in the water tank 4. A spray device 5 is provided in the battery box 1. The spray device 5 is connected to the water outlet end of the water pump 41, so that water mist can be produced into the battery box 1 by the spray device 5. Since the water mist contacts the surface of the battery 2 in the battery box 1 and adheres to the battery 2, the water mist absorbs the heat on the surface of the battery 2, so that the temperature of the water mist increases. At the same time, due to the flow of air, the water adhered to the surface of the battery 2 is more likely to evaporate. When the water mist evaporates, it will further absorb the heat on the surface of the battery 2. Because water absorbs heat during evaporation, the temperature of the surface of the battery 2 can be reduced a lot, and then the heat inside the battery 2 can be more easily extracted. Then the formed steam is discharged with the operation of the exhaust fan 31, and the steam takes away more heat to reduce the heat release caused by steam recondensation in the battery box 1. Compared with the battery 2 being directly in the aqueous solution, the evaporation process of the water mist on the surface of the battery 2 can cool the battery 2 more significantly, and at the same time can directly discharge the steam formed by the evaporation of water, so that the heat carried by the steam can directly leave the battery box 1, thereby improving the efficiency of heat dissipation.

[0036] The top surface of the water tank 4 is used to fix the battery box 1, and the top surface of the water tank 4 is directly opposite to the bottom position of the battery box 1. A plurality of air filters 42 are arranged on the top surface of the battery box 1 and outside the battery box 1. The air filter 42 is connected to the inside of the water tank 4, so that the air entering the air filter 42 is first filtered by the air filter 42, and then enters the water tank 4, and then enters the battery box 1 upward from the position where the water tank 4 is connected to the battery box 1. At the same time, a filter cotton 11 is arranged at the bottom of the battery box 1, and the edge of the filter cotton 11 extends to the inner wall of the battery box 1, so that the filter cotton 11 further filters the air entering the battery box 1, and the air is relatively clean when it arrives at the battery box 1, reducing the impurities entering the battery box 1 and sticking to the surface of the battery 2, which affects the heat dissipation of the battery 2. Since the air filter 42 first filters the air once, and then the filter cotton 11 filters the air twice, the replacement frequency of the filter cotton 11 is reduced, and the degree of filtering the air is improved. Moreover, the air filter 42 is located on the top surface of the water tank 4, which is convenient for the maintenance of the air filter 42. A collecting device 7 for collecting water droplets is provided above the filter cotton 11. When the water mist in the battery box 1 falls due to the large atomized particles, the water droplets are reduced from sticking to the filter cotton 11 and affecting the filtering effect of the filter cotton 11, so that the water droplets are collected by the collecting device 7 during the falling process.

[0037] refer to Figure 3The collecting device 7 includes a plurality of inclined plates 71, which are arranged at an angle to the vertical direction, and are arranged in parallel along the same direction, and the overlapping area of ​​the projections of two adjacent inclined plates 71 in the vertical direction is 0.2-0.5 times the projection area of ​​each inclined plate 71, and then the side edge of the lowest part of the inclined plate 71 is folded upward to form a retaining edge 72, and a notch 73 is opened in the middle of the retaining edge 72, and at least one notch 73 is provided, and both sides of the inclined plate 71 close to the inner wall of the battery box 1 are welded and fixed to the inner wall of the battery box 1, so that the water droplets collected on the inclined plate 71 are discharged by the notch 73. The water on the inclined plates 71 flows downward from the position of the confluence groove 74. At the same time, a confluence groove 74 is provided below the inclined plate 71. The cross section of the confluence groove 74 is a U-shape opening upward. The confluence groove 74 is located directly below the notch 73, so that the confluence groove 74 is used to collect water droplets on the multiple inclined plates 71. At the same time, drain pipes 75 are provided at both ends of the confluence groove 74. One end of the drain pipe 75 away from the confluence groove 74 is connected to the water tank 4. The drain pipe 75 can also be vertically arranged to pass through the filter cotton 11, and the upper end of the drain pipe 75 is connected to the bottom of the confluence groove 74, and the lower end is connected to the bottom of the water tank 4, so that the water droplets automatically return to the water tank 4 for reuse.

[0038] The inner wall of the battery box 1 is provided with a mounting position 6, each mounting position 6 is formed by four baffles 61 arranged in a rectangular shape, each mounting position 6 corresponds to a battery 2, the battery 2 is inserted into the middle of the four baffles 61, the four baffles 61 abut against the four sides of the battery 2, and the position of the battery 2 is conveniently fixed. The baffles 61 are welded to the inner wall of the battery box 1 and protrude from the inner wall of the battery box 1 by 1-2 cm. Figure 4 The batteries 2 are all provided with metal poles 21, which are arranged upwards to keep the batteries 2 in the correct installation direction. Multiple batteries 2 in a group are evenly arranged along the center line of the battery box 1. Since the batteries 2 are rectangular in structure, when multiple batteries 2 are arranged circumferentially, there must be a gap between two batteries 2 to form a vertical channel 81. When water mist enters the vertical channel 81, it will contact the surface of the battery 2 and can take away the heat on the surface of the battery 2 under the action of the exhaust fan 31. At the same time, the upper and lower layers of batteries 2 are also arranged at intervals through the arrangement of the mounting positions 6, so that multiple surfaces of the batteries 2 can be directly cooled, improving the cooling efficiency of the batteries 2. At the same time, since the cylindrical battery box 1 is ventilated sequentially from bottom to top, the cooling airflow has good directionality, reducing the accumulation of heat in some areas, so that all batteries 2 can obtain a uniform cooling effect.

[0039] refer to Figure 4 and Figure 5A central channel 82 is formed at the center of the multiple batteries 2. The radius of the space of the central channel 82 should be larger than the radial width of the battery 2 along the battery box 1, so that the battery 2 can be loaded or unloaded from the central channel 82. Maintenance personnel can enter the central channel 82. When a single battery 2 is damaged or the battery 2 needs maintenance, the maintenance personnel can enter the battery box 1 from the central channel 82 to check the condition of each battery 2 or replace any battery 2. Multiple batteries 2 in each group are connected in series or in parallel through elastic metal connecting pieces 23. The elastic metal connecting pieces 23 can be composed of multiple layers of copper sheets to form a soft copper bar. An insulating heat-conducting sheet 24 is also provided in the middle of the elastic metal connecting piece 23. Both ends of the elastic metal connecting piece 23 are fixed on the pole 21 of the battery 2 through nuts. Since the pole 21 of the battery 2 is made of metal material and has a fast internal heat conduction rate with the battery 2, the elastic metal connecting piece 23 has a good internal heat conduction effect on the battery 2, and can quickly conduct the heat inside the battery 2 through the pole 21. The outside of the connection between the metal connecting piece 23 and the pole 21 is insulated and protected by applying insulating glue or spraying insulating paint to reduce the short circuit caused by the water accumulation that may form on the upper surface of the battery 2.

[0040] A metal heat conducting plate 25 is arranged above each layer of storage batteries 2. The metal heat conducting plate 25 is a hollow plate structure. A plurality of screws 26 are arranged at the edge of the metal heat conducting plate 25. A plurality of mounting ears 27 are fixedly arranged on the inner wall of the battery box 1. The screws 26 are threadedly connected to the mounting ears 27. The lower surface of the metal heat conducting plate 25 abuts against the mounting ears 27, so that the metal heat conducting plate 25 is fixedly connected to the battery box 1. At the same time, a connecting bolt 231 is arranged at the position of the insulating heat conducting sheet 24. The connecting bolt 231 penetrates The elastic metal connecting piece 23 is not in contact with the elastic metal connecting piece 23, and the insulating heat-conducting piece 24 isolates the conductivity between the connecting bolt 231 and the metal heat-conducting plate 25 and the elastic metal connecting piece 23. At the same time, the insulating heat-conducting piece 24 can transfer the heat of the elastic metal connecting piece 23 to the metal heat-conducting plate 25, so that the metal heat-conducting plate 25 cools the inside of the battery 2. Since the area of ​​the metal heat-conducting plate 25 is large, the efficiency of heat dissipation after contact with the water mist is higher, so that the inside of the battery 2 is directly cooled faster. A clearance port 251 is also provided on the metal heat-conducting plate 25, and the clearance port 251 is located directly above the pole 21 of the battery 2. The position of the clearance port 251 is used to facilitate the connection or removal of the elastic metal connecting piece 23 on the pole 21 of the battery 2, so as to facilitate the installation and removal of the battery 2. The insulating heat-conducting piece 24 can be made of alumina ceramic material.

[0041] refer to Figure 6The spray device 5 includes a main pipe 51 and a plurality of branch pipes 52. The main pipe 51 is vertically arranged and located at the center of the battery box 1. The lower end of the main pipe 51 is connected to the water outlet of the water pump 41. The branch pipe 52 is horizontally arranged. One end of the branch pipe 52 is connected to the main pipe 51, and the other end extends along the radial direction of the battery box 1 and is welded and fixed to the inner wall of the battery box 1, so that the branch pipe 52 supports the main pipe 51. A plurality of spray points 53 are arranged in the length direction of the branch pipe 52. The spray points 53 can be formed by opening spray holes or installing mist nozzles, so that the branch pipe 52 forms water mist on the inside of the battery box 1 along the length direction of the branch pipe 52, so that the water mist moves to the plurality of storage batteries 2. At the same time, the water mist can also absorb the heat inside the battery box 1 by evaporation, so that the heat of the storage battery 2 is heat-exchanged with the surrounding air. At the same time, in the middle of each layer of storage batteries 2, A stirring device 9 is provided at the position of the core channel 82, and the stirring device 9 includes a rotating ring 91, a driving blade 92 and a stirring blade 93. The rotating ring 91 is rotatably set on the main pipe 51, and a plurality of driving blades 92 are fixed on the outer peripheral wall of the rotating ring 91. The driving blades 92 are inclined to the axial direction of the battery box 1, so that the airflow in the battery box 1 blows the driving blades 92, thereby rotating the rotating ring 91 around the main pipe 51. The stirring blades 93 are fixed on the rotating ring 91, and the stirring blades 93 are vertically set, and the stirring blades 93 extend along the radial direction of the battery box 1, so that when the stirring blades rotate, the water mist in the battery box 1 moves in the radial direction of the battery box 1. Because the water mist can be more evenly and fully contacted with the battery 2 under the action of the stirring device 9, the cooling of all batteries 2 can be further improved.

[0042] refer to Figure 6 and Figure 7 A fixing member 10 is provided in the middle of the metal heat-conducting plate 25. The fixing member 10 is used to fix the battery 2 to reduce the possibility of the battery 2 being dislodged from the mounting position 6 during use. The fixing member 10 includes a ring body 101 and abutment posts 102. A ring groove 103 is provided on the outer wall of the ring body 101. The inner hole of the metal heat-conducting plate 25 is inserted into the ring groove 103. The abutment posts 102 are fixed to the ring body 101, and the abutment posts 102 are arranged on both sides of the ring body 101. One end of the abutment posts 102 away from the ring body 101 extends toward the battery 2 above and below the metal heat-conducting plate 25, respectively, so that the abutment posts 102 are blocked on the side wall of the battery 2 close to the central channel 82. When the battery 2 needs to be moved out of the mounting position 6, the fixing member 10 is rotated so that the abutment posts 102 are located between the two batteries 2, so that the abutment posts 102 are staggered from the batteries 2.

[0043] The usage process of this embodiment:

[0044] The spray device 5 adds water mist to the interior of the battery box 1, and then the exhaust fan 31 forms airflow in the central channel 82 and the vertical channel 81 when working. The water mist will move vertically along the battery box 1, and in the process of movement, it will contact the surface of the battery 2, the surface of the metal heat conductive plate 25 and the surface of the elastic metal connecting piece 23. Then the airflow drives the driving blades 92, and the stirring blades 93 will move the water mist horizontally, so that the water mist fully contacts the battery 2 in the battery box 1, so that the water mist is evaporated under the action of the airflow, the surface of the battery 2 is cooled and the interior of the battery 2 is cooled through the pole 21.

[0045] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A battery box heat dissipation structure of a photovoltaic power storage conversion system based on a microgrid, characterized by: The battery box (1) comprises a battery box (1), the battery box (1) being arranged in a vertical cylindrical shape, a plurality of layers of storage batteries (2) being arranged inside the battery box (1), each layer of storage batteries (2) being evenly arranged along the peripheral wall of the battery box (1), a spray device (5) being arranged inside the battery box (1), the spray device (5) being connected to a water pump (41) for passing water into the spray device (5), an exhaust fan (31) being connected to one end of the battery box (1), a vertical channel (81) being formed between the side walls of two adjacent storage batteries (2), a central channel (82) being formed in the middle of each layer of storage batteries (2), and the water mist formed by the spray device (5) passing through each layer of storage batteries (2) in sequence from one end of the battery box (1) through the airflow formed by the exhaust fan (31); The spray device (5) produces water mist into the battery box (1), the water mist adheres to the surface of the storage battery (2), and the water on the surface of the storage battery (2) evaporates through the airflow; The spray device (5) comprises a main pipe (51) and a plurality of branch pipes (52), the main pipe (51) being located in the middle of the central channel (82), one end of the main pipe (51) being connected to a water pump (41), one end of the branch pipe (52) being fixed to and in communication with the main pipe (51), the other end of the branch pipe (52) being fixed to the inner wall of the battery box (1), and a plurality of spray points (53) being arranged along the length direction of the branch pipe (52); A stirring device (9) is arranged inside the central channel (82), the stirring device (9) comprising a rotating ring (91), a driving blade (92) and a stirring blade (93), the rotating ring (91) being rotatably arranged on the main pipe (51), the driving blade (92) and the stirring blade (93) being fixed on the peripheral wall of the rotating ring (91), the driving blade (92) being arranged obliquely with respect to the center line of the central channel (82), and the stirring blade (93) being arranged vertically and extending along the radial direction of the battery box (1).

2. According to claim 1, a battery box heat dissipation structure of a microgrid-based photovoltaic power conversion system is characterized by: A metal connecting piece (23) is fixedly provided on the pole (21) of the storage battery (2); the outside of the connection between the metal connecting piece (23) and the pole (21) is insulated and protected by applying insulating glue or spraying insulating paint; a metal heat conducting plate (25) is provided above each layer of storage battery (2); an insulating heat conducting plate (24) is provided in the middle of the metal connecting piece (23); heat is conducted between the metal connecting piece (23) and the metal heat conducting plate (25) via the insulating heat conducting plate (24); and the metal heat conducting plate (25) is a hollow structure.

3. According to claim 1, a battery box heat dissipation structure of a microgrid-based photovoltaic energy storage conversion system is characterized by: The battery box (1) has an installation position (6) disposed on the inner wall thereof. The installation position (6) is formed by four baffles (61) arranged in a rectangular shape. The storage battery (2) is inserted between the four baffles (61). A fixing member (10) is disposed inside the battery box (1). The fixing member (10) is used to abut against a side of the storage battery (2) away from the installation position (6).

4. The heat dissipation structure of a battery box of a microgrid-based photovoltaic power conversion system according to claim 3 is characterized in that: The fixing member (10) comprises a ring body (101) and an abutment column (102); the ring body (101) is coaxially arranged with the battery box (1); the ring body (101) and the battery box (1) are connected to each other for relative rotation; the abutment column (102) is fixed to the surface of the ring body (101) and extends toward the side of the storage battery (2); the abutment column (102) is used to abut against a side of the storage battery (2) away from the installation position (6); and the distance between two adjacent storage batteries (2) on the same layer is greater than the width of the abutment column (102).

5. According to the heat dissipation structure of the battery box of the microgrid-based photovoltaic power conversion system of claim 1, it is characterized by: The bottom of the battery box (1) is provided with filter cotton (11), and a collecting device (7) is provided above the filter cotton (11). The collecting device (7) comprises a plurality of inclined plates (71), and the lower side of the inclined plate (71) is provided with an upwardly inclined retaining edge (72), and a notch (73) is provided on the retaining edge (72). A confluence groove (74) directly opposite to the notch (73) is provided below the inclined plate (71), and the confluence groove (74) is used to receive water flowing out of the notch (73). The projections of two adjacent inclined plates (71) in the vertical direction overlap each other.

6. The heat dissipation structure of a battery box of a microgrid-based photovoltaic power conversion system according to claim 5, characterized in that: A water tank (4) is provided at the bottom of the battery box (1); the top surface of the water tank (4) penetrates and communicates with the bottom end of the battery box (1); a plurality of air filters (42) are provided on the water tank (4); and the air enters the interior of the water tank (4) through the air filters (42).

7. The heat dissipation structure of a battery box of a microgrid-based photovoltaic power conversion system according to claim 6, characterized in that: The water pump (41) is arranged in the water tank (4), and a drainage pipe (75) is arranged on the confluence trough (74). One end of the drainage pipe (75) leads into the water tank (4), and the other end is connected to the confluence trough (74).

8. The heat dissipation structure of a battery box of a microgrid-based photovoltaic power conversion system according to claim 1, characterized in that: The upper end of the battery box (1) is sequentially connected to at least one other battery box (1), and then connected to the exhaust fan (31) via a connecting pipe (3).

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