CN216245205U

CN216245205U - Drying box for drying heterojunction solar cell

Info

Publication number: CN216245205U
Application number: CN202122821282.XU
Authority: CN
Inventors: 李祥; 周喜明; 李健
Original assignee: Zhejiang Fortune Energy Co ltd
Current assignee: Zhejiang Fortune Energy Co ltd
Priority date: 2021-11-16
Filing date: 2021-11-16
Publication date: 2022-04-08
Anticipated expiration: 2031-11-16

Abstract

The utility model discloses a drying box for drying a heterojunction solar cell, which comprises a box body, a hot nitrogen device, a cooling nitrogen device and a vacuum device, wherein a cell rack is placed in the box body, the hot nitrogen device comprises a first nitrogen box, a first air pipe, a heating device, a second air pipe, a first air pump and a nitrogen filter, the cooling nitrogen device comprises a second nitrogen box, a third air pipe, a radiator, a fourth air pipe and a second air pump, and the vacuum device comprises a vacuumizing device. According to the drying box for drying the heterojunction solar cell, the characteristic that the heterojunction solar cell is thin and is easily influenced by oxygen is adopted, hot nitrogen is used for rapidly drying under the anaerobic condition in the drying process, and the photoelectric property of the heterojunction solar cell is not influenced by the drying process. Improves the drying efficiency, reduces the consumption of nitrogen and saves the production cost.

Description

Drying box for drying heterojunction solar cell

Technical Field

The utility model belongs to the technical field of solar cell production, and particularly relates to a drying box for drying a heterojunction solar cell.

Background

The heterojunction solar cell has a series of advantages of high conversion efficiency, short manufacturing process flow, thin silicon wafer, low temperature coefficient, no light attenuation, double-sided power generation, high double-sided efficiency and the like, and is praised as the next generation ultra-high efficiency solar cell technology with the best industrialization potential. Compared with the traditional single crystal/polycrystal solar cell, the heterojunction solar cell can obtain higher conversion efficiency, only needs few process steps, and can ensure more reliable and longer service life of a photovoltaic module. Therefore, heterojunction solar cells become a key research object of solar cell enterprises. In the manufacturing process of the heterojunction solar cell, the solar cell needs to be dried by using a drying device. The existing drying equipment mainly heats compressed air and transfers the air into an oven for placing solar cells, so that hot air flow is generated in the oven, and the solar cells are dried. This drying mode tends to contaminate the hetero-junction silicon wafer and reduce its minority carrier lifetime. The utility model patent "heterojunction solar cell piece drying device" of application number CN201620447683.X discloses a device that adopts nitrogen gas dry heterojunction solar cell piece, and the device uses nitrogen gas drying, has reduced the influence that heterojunction silicon piece received in drying process. However, drying is performed at normal temperature using nitrogen, and the drying efficiency is low. Each box of nitrogen can only be used once, the consumption of nitrogen is large, and the cost is high.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problems, the utility model adopts the technical scheme that: the utility model provides a stoving case for dry heterojunction solar wafer, is including box, hot nitrogen gas device, cooling nitrogen gas device, vacuum apparatus, be equipped with sealed lid on the box, placed the wafer frame in the box, hot nitrogen gas device is equipped with nitrogen gas including first nitrogen gas case in the first nitrogen gas case, is equipped with gas outlet and return air inlet on the first nitrogen gas case, and the box is connected through first trachea in the gas outlet, installs heating device on the first trachea, and the return air inlet passes through second trachea and connects the box, is equipped with first air pump and nitrogen filter on the second trachea in proper order, cooling nitrogen gas device is including second nitrogen gas case, is equipped with gas vent and air inlet on the second nitrogen gas case, and the gas vent passes through third trachea and connects the box, installs the radiator on the third trachea, and the air inlet passes through fourth trachea and connects the box, is equipped with the second air pump on the fourth trachea, the both ends of first trachea, Valves are respectively arranged at the two ends of the second air pipe, the two ends of the third air pipe and the two ends of the fourth air pipe, and the vacuum device comprises a vacuum pumping device which is connected with the box body through a pipeline with the valve.

Preferably, the first nitrogen box and the second nitrogen box are internally provided with a temperature sensor and a pressure sensor respectively, and the box body is internally provided with the temperature sensor and the pressure sensor.

Preferably, in the above technical solution, a joint of the first air pipe and the box body is a first vent, a joint of the second air pipe and the box body is a second vent, a joint of the third air pipe and the box body is a third vent, a joint of the fourth air pipe and the box body is a fourth vent, the first vent and the second vent are respectively located at the left and right sides of the box body, and the third vent and the fourth vent are respectively located at the left and right sides of the box body.

Preferably, the left side and the right side of the battery piece rack are respectively provided with an air distribution plate, and the air distribution plates are respectively provided with air distribution holes.

As the optimization of the technical scheme, the battery piece frame comprises a frame body, a plurality of small frame bodies are placed in the frame body, and the battery pieces are sequentially and horizontally placed on the small frame bodies from bottom to top.

Preferably, a fan is disposed beside the heat sink.

The utility model has the beneficial effects that: according to the drying box for drying the heterojunction solar cell, the characteristic that the heterojunction solar cell is thin and is easily influenced by oxygen is adopted, hot nitrogen is used for rapidly drying under the anaerobic condition in the drying process, and the photoelectric property of the heterojunction solar cell is not influenced by the drying process. Improves the drying efficiency, reduces the consumption of nitrogen and saves the production cost.

Drawings

Fig. 1 is a schematic structural view of the present invention.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1, a drying box for drying heterojunction solar cells comprises a box body 1, a hot nitrogen device, a cooling nitrogen device and a vacuum device, wherein a sealing cover 2 is arranged on the box body 1, a cell frame 3 is placed in the box body 1, the hot nitrogen device comprises a first nitrogen box 4, nitrogen is filled in the first nitrogen box 4, a gas outlet 5 and a gas return port 6 are arranged on the first nitrogen box 4, the gas outlet 5 is connected with the box body 1 through a first gas pipe 7, a heating device 8 is arranged on the first gas pipe 7, the gas return port 6 is connected with the box body 1 through a second gas pipe 9, a first gas pump 10 and a nitrogen filter 11 are sequentially arranged on the second gas pipe 9, the cooling nitrogen device comprises a second nitrogen box 12, a gas outlet 13 and a gas inlet 14 are arranged on the second nitrogen box 12, the gas outlet 13 is connected with the box body 1 through a third gas pipe 15, a radiator 16 is arranged on the third gas pipe 15, the air inlet 14 is connected with the box body 1 through a fourth air pipe 17, a second air pump 18 is arranged on the fourth air pipe 17, valves are respectively arranged at the two ends of the first air pipe 7, the two ends of the second air pipe 9, the two ends of the third air pipe 15 and the two ends of the fourth air pipe 17, the vacuum device comprises a vacuumizing device 18, and the vacuumizing device 18 is connected with the box body 1 through a pipeline with the valves. Specifically, a valve of the first gas pipe 7 adjacent to the tank 1 is set as a first valve 19, and a valve of the first gas pipe 7 adjacent to the first nitrogen tank 4 is set as a second valve 20. The valve on the second gas pipe 9 close to the box body 1 is set as a third valve 21, and the valve on the second gas pipe 9 close to the first nitrogen box 4 is set as a fourth valve 22. The valve on the third gas pipe 15 close to the tank 1 is set as a fifth valve 23, and the valve on the third gas pipe 15 close to the second nitrogen tank 12 is set as a sixth valve 24. The valve on the fourth gas pipe 17 close to the tank 1 is set as a seventh valve 25, and the valve on the fourth gas pipe 17 close to the second nitrogen tank 12 is set as an eighth valve 26. The valve connected to the vacuum pumping device 18 is set as a ninth valve 27. Putting the heterojunction solar cell into the cell frame 3, putting the cell frame 3 into the box body 1, and covering the sealing cover 2 to enable the box body 1 to be in a closed state. All valves are in a closed state. The ninth valve 27 is opened and the vacuum pumping device 18 pumps the interior of the chamber 1 to a slight vacuum state. The heating device 8 starts preheating, then the first valve 19 and the second valve 20 are opened, and the nitrogen in the first nitrogen box 4 is heated and enters the box body 1. Then, the first valve 19 and the second valve 20 are closed, the first air pump 10 is started, and the third valve 21 and the fourth valve 22 are opened, so that the nitrogen gas in the tank 1 is pumped back to the first nitrogen gas tank 4. Water vapor and the like are trapped by the nitrogen filter 11. The above steps are repeated two to three times. Then the fifth valve 23 and the sixth valve 24 are opened, a certain amount of normal temperature nitrogen is filled into the box body 1 and then closed, the seventh valve 25 and the eighth valve 26 are opened, the second air pump 18 is started, the normal temperature nitrogen in the box body 1 is pumped back to the second nitrogen box 12, and the steps are repeated for two to three times. And the second nitrogen box 12 is utilized to realize the rapid cooling of the heterojunction solar cell. When the temperature in the box body 1 is close to the room temperature, air is automatically filled by utilizing the pressure relief valve on the box body 1, the sealing cover 2 is opened, the cell holder 3 is taken out, and the drying process of the heterojunction solar cell is completed.

Further, install temperature-sensing ware and pressure sensors in first nitrogen case 4 and the second nitrogen case 12 respectively, install temperature-sensing ware and pressure sensors in the box 1.

Further, the junction of the first air pipe 7 and the box body 1 is set as a first vent 28, the junction of the second air pipe 9 and the box body 1 is set as a second vent 29, the junction of the third air pipe 15 and the box body 1 is set as a third vent 30, the junction of the fourth air pipe 17 and the box body 1 is set as a fourth vent 31, the first vent 28 and the second vent 29 are respectively located at the left and right sides of the box body 1, and the third vent 30 and the fourth vent 31 are respectively located at the left and right sides of the box body 1. Therefore, the stability of the air flow in the box body 1 can be ensured, and the air flow can be stably contacted with all the heterojunction solar cells to take away moisture. The local heterojunction solar cell is prevented from being overhigh in temperature or positioned in an air flow dead angle.

Further, the left side and the right side of the battery piece rack 3 are respectively provided with an air distribution plate 32, and the air distribution plate 32 is respectively provided with an air distribution hole. The air distribution plate 32 makes the air flow in the box body 1 more uniform and stable.

Further, the battery piece frame 3 comprises a frame body 33, a plurality of small frame bodies 34 are placed in the frame body, and the battery pieces are sequentially and evenly spaced and horizontally placed on the small frame bodies 34 from bottom to top. Specifically, the support body comprises the bottom plate and a plurality of pin that are located the bottom plate all around, and little support body 34 has the connecting plate and is located three pole settings around the connecting plate and constitute, is equipped with a plurality of support archs in the pole setting, and the support arch in three pole settings is corresponding respectively, and the support arch in three pole settings is arranged respectively to heterojunction solar wafer's lower extreme when placing in little support body 34 in the heterojunction solar wafer. The heterojunction solar cell is put into the small frame 34 from one side of the small frame 34.

Further, a fan 35 is disposed beside the heat sink 16. The heat sink 16 may be formed of a conventional heat sink, and the fan 5 accelerates the heat dissipation of the heat sink 16.

It should be noted that the technical features of the vacuum pumping device, the air pump, the heating device, the heat sink, the nitrogen filter, etc. related to the present patent application should be regarded as the prior art, and the specific structure, the operation principle, the control mode and the spatial arrangement mode of the technical features may be conventional in the art, and should not be regarded as the utility model point of the present patent, and the present patent is not further specifically described in detail.

Having described preferred embodiments of the present invention in detail, it is to be understood that modifications and variations may be resorted to without departing from the spirit and scope of the utility model as defined by the appended claims.

Claims

1. A drying box for drying heterojunction solar cells is characterized by comprising a box body, a hot nitrogen device, a cooling nitrogen device and a vacuum device, wherein a sealing cover is arranged on the box body, a cell frame is placed in the box body, the hot nitrogen device comprises a first nitrogen box, nitrogen is filled in the first nitrogen box, a gas outlet and a gas return port are arranged on the first nitrogen box, the gas outlet is connected with the box body through a first gas pipe, a heating device is arranged on the first gas pipe, the gas return port is connected with the box body through a second gas pipe, a first air pump and a nitrogen filter are sequentially arranged on the second gas pipe, the cooling nitrogen device comprises a second nitrogen box, an air outlet and an air inlet are arranged on the second nitrogen box, the air outlet is connected with the box body through a third gas pipe, a radiator is arranged on the third gas pipe, the air inlet is connected with the box body through a fourth gas pipe, and a second air pump is arranged on the fourth gas pipe, valves are respectively arranged at the two ends of the first air pipe, the two ends of the second air pipe, the two ends of the third air pipe and the two ends of the fourth air pipe, the vacuum device comprises a vacuum pumping device, and the vacuum pumping device is connected with the box body through a pipeline with the valves.

2. The drying oven for drying heterojunction solar cells of claim 1, wherein the first nitrogen box and the second nitrogen box are respectively provided with a temperature sensor and a pressure sensor, and the temperature sensor and the pressure sensor are arranged in the oven body.

3. The drying box for drying the heterojunction solar cell of claim 1, wherein a junction of the first air pipe and the box body is a first vent, a junction of the second air pipe and the box body is a second vent, a junction of the third air pipe and the box body is a third vent, a junction of the fourth air pipe and the box body is a fourth vent, the first vent and the second vent are respectively located at the left side and the right side of the box body, and the third vent and the fourth vent are respectively located at the left side and the right side of the box body.

4. The drying oven for drying heterojunction solar cell as claimed in claim 3, wherein the gas distribution plates are respectively disposed at the left and right sides of the cell holder, and the gas distribution holes are respectively disposed on the gas distribution plates.

5. The drying oven for drying heterojunction solar cells of claim 4, wherein the cell holder comprises a holder body, a plurality of small holder bodies are placed in the holder body, and the cells are horizontally placed on the small holder bodies from bottom to top in sequence.

6. The drying oven for drying heterojunction solar cells of claim 1, wherein a fan is disposed beside said heat sink.