A battery cell coating system

Abstract

An embodiment of the present invention provides a cell coating system, which includes: a conveyor line for conveying cell sheets and a plurality of coating modules arranged beside the transmission stations of the conveyor line, the conveyor line has a plurality of transmission stations, the cell sheets are transmitted between the coating modules and the transmission stations, and the plurality of coating modules include: a first coating module including at least one first coating device; a second coating module including at least one second coating device; a third coating module including at least one second coating device; a fourth coating module including at least one fourth coating device; wherein the number of at least one of the first coating device, the second coating device, the third coating device and the fourth coating device is not less than two. The cell coating system in the embodiment of the present invention reduces the probability of the conveyor line needing to wait for processing by a single coating device and waiting in vain as a whole, and increases the number of cell sheets processed per unit time.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic equipment, and in particular to a cell film coating system. Background Art

[0002] With the increasing demand for energy conservation and emission reduction, photovoltaic power generation has a broad industrial prospect in the world. Among them, silicon-based heterojunction solar cells, with their simple preparation process, high conversion efficiency and high cost reduction and efficiency improvement potential, have attracted more and more attention from the industry and have become a hot spot in the industry.

[0003] The PECVD (plasma enhanced chemical vapor deposition) process is a surface coating process that uses a high-frequency power supply to ionize the reaction gas into a plasma state under a relatively high vacuum environment. It is widely used in the field of photovoltaic cell manufacturing.

[0004] Taking the silicon-based heterojunction cell coating production line as an example, in the relevant technology, a plurality of PECVD process equipment are arranged in sequence on the production line, and the PECVD process equipment is used to symmetrically deposit the intrinsic thin film silicon layer on the upper and lower surfaces of the crystalline silicon substrate; then other PECVD process equipment is used to deposit the N-type doped layer and the P-type doped layer on the intrinsic thin film silicon layer on the upper and lower surfaces. Since the coating time of the intrinsic thin film silicon layer, the N-type doped layer and the P-type doped layer are different, and the production rhythm of the production line is set according to the longest coating process, the other processes have a long waiting time and the production efficiency is low. Summary of the invention

[0005] In view of this, the embodiments of the present application hope to provide a cell coating system that can improve the efficiency of cell coating.

[0006] To achieve the above purpose, the technical solution of the embodiment of the present application is implemented as follows:

[0007] An embodiment of the present invention provides a cell coating system, the cell coating system comprising:

[0008] A conveyor line for conveying battery cells, the conveyor line having a plurality of transfer stations;

[0009] A plurality of coating modules are arranged beside the transmission station of the conveyor line, and the battery sheets are transmitted between the coating modules and the transmission station. The plurality of coating modules include:

[0010] A first coating module, comprising at least one first coating device for coating a first intrinsic layer on a first surface of a solar cell;

[0011] The second coating module includes at least one second coating device for coating a second intrinsic layer on a second surface of the battery cell.

[0012] A third coating module, comprising at least one third coating device for coating an N-type doped layer on the first intrinsic layer;

[0013] The fourth coating module comprises at least one fourth coating device for coating a P-type doped layer on the second intrinsic layer; wherein the number of at least one of the first coating device, the second coating device, the third coating device and the fourth coating device is not less than two.

[0014] In some embodiments, among the first coating device, the second coating device, the third coating device, and the fourth coating device, the number of the devices with the longest coating time required is no less than two.

[0015] In some embodiments, among the first coating device, the second coating device, the third coating device, and the fourth coating device, the number of devices having the longest coating time is the largest.

[0016] In some embodiments, the first coating module is adjacent to the third coating module along the conveying direction; and\or, the second coating module is adjacent to the fourth coating module along the conveying direction.

[0017] In some embodiments, the conveying line includes at least one flipping station for flipping the battery cell, and the flipping station is located between the third coating module and the fourth coating module.

[0018] In some embodiments, the number of the flipping station is one, the first coating module is adjacent to the third coating module along the conveying direction, and the second coating module is adjacent to the fourth coating module along the conveying direction; the flipping station is located on the conveying line between the third coating module and the second coating module; or, the flipping station is located on the conveying line between the fourth coating module and the first coating module.

[0019] In some embodiments, the number of the flipping stations is two, the first coating module is adjacent to the third coating module along the conveying direction, one of the flipping stations is located on the conveying line between the second coating module and the first coating module, and the other flipping station is located on the conveying line between the third coating module and the fourth coating module; or, the second coating module is adjacent to the fourth coating module along the conveying direction, one of the flipping stations is located on the conveying line between the first coating module and the second coating module, and the other flipping station is located on the conveying line between the fourth coating module and the third coating module.

[0020] In some embodiments, the conveyor line includes at least one heating station for heating battery cells, at least one sheet loading station for delivering battery cells into a vacuum environment, and at least one sheet discharging station for delivering battery cells out of the vacuum environment; the conveyor line and each of the coating modules form at least one vacuum treatment process section along the conveying direction, and each of the vacuum treatment sections is provided with the sheet loading station, the sheet discharging station and the heating station, the sheet loading station is located at the head end of the vacuum treatment process section, the heating station is located between the sheet loading station and the transmission station, and the sheet discharging station is located at the end of the vacuum treatment process section.

[0021] In some embodiments, at least one of the transfer stations is provided with the first coating device on one side along the conveying direction, and the third coating device on the other side.

[0022] In some embodiments, at least one of the transfer stations is provided with the second coating device on one side along the conveying direction, and the fourth coating device on the other side.

[0023] The cell coating system in the embodiment of the present invention reduces the probability of the conveyor line needing to wait for processing by a single coating device and waiting in vain, increases the number of cells processed per unit time, improves production efficiency, and reduces production costs. Each coating device independently transmits cells to and from the conveyor line. Even if some coating devices need maintenance or are damaged, it will not affect the transmission of cells between the conveyor line and other coating devices, reduces the probability of the cell coating system stopping operation due to maintenance or damage of the coating device, and improves the utilization rate of the entire cell coating system. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the layout of a cell coating system in one embodiment of the present invention, wherein the dotted frame is a vacuum treatment process section;

[0025] Figure 2 FIG. 1 is a schematic diagram of the layout of a cell coating system in another embodiment of the present invention, wherein the dashed box has the same meaning as FIG. Figure 1 ;

[0026] Figure 3 FIG. 1 is a schematic diagram of the layout of a cell coating system in another embodiment of the present invention, wherein the dashed box has the same meaning as FIG. Figure 1 ;

[0027] Figure 4 FIG. 1 is a schematic diagram of the layout of a cell coating system in another embodiment of the present invention, wherein the dashed box has the same meaning as FIG. Figure 1 ;

[0028] Figure 5FIG. 1 is a schematic diagram of the layout of a cell coating system in another embodiment of the present invention, wherein the dashed box has the same meaning as FIG. Figure 1

[0029] Figure 6 FIG. 1 is a schematic diagram of the layout of a cell coating system in another embodiment of the present invention, wherein the dashed box has the same meaning as FIG. Figure 1 ;

[0030] Figure 7 FIG. 1 is a schematic diagram of the layout of a cell coating system in another embodiment of the present invention, wherein the dashed box has the same meaning as FIG. Figure 1 ;

[0031] Figure 8 FIG. 1 is a schematic diagram of the layout of a cell coating system in another embodiment of the present invention, wherein the dashed box has the same meaning as FIG. Figure 1 , wherein the number in the brackets indicates the nth coating device of this type along the conveying direction;

[0032] Fig. 9 FIG. 1 is a schematic diagram of the layout of a cell coating system in another embodiment of the present invention, wherein the dashed box has the same meaning as FIG. Figure 1 .

[0033] Description of Reference Numerals

[0034] Conveyor line 10; vacuum treatment process section 10a; transfer station 11; flip station 12; heating station 13; sheet feeding station 14; sheet discharging station 15; coating module 20; first coating module 21; first coating device 211; second coating module 22; second coating device 221; third coating module 23; third coating device 231; fourth coating module 24; fourth coating device 241 DETAILED DESCRIPTION

[0035] It should be noted that, in the absence of conflict, the embodiments and technical features in the embodiments of the present application can be combined with each other, and the detailed description in the specific implementation method should be understood as an explanation of the purpose of the present application and should not be regarded as an improper limitation on the present application.

[0036] In the description of this application, the "transport direction" orientation or position relationship is based on the attached Figure 1 Regarding the orientation or positional relationship shown, it should be understood that these orientation terms are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0037] In the related technology, there are two main layout methods for the cell coating system using the PECVD process:

[0038] One is a chain arrangement, that is, each station is connected end to end in sequence. After the battery cell enters the vacuum environment through automated operation, various processes are completed in sequence, such as heating, intrinsic thin film silicon layer coating, doping layer coating, etc. In this method, since each station is arranged in series and the battery cells complete various processes in sequence, if a problem occurs in a station, the entire production line will be shut down. And because the process time required for different film layers is different, it is difficult to match the number of different stations. There is a situation where the utilization efficiency of some stations is low and the space occupied is relatively large, which is not conducive to the improvement of the production capacity of the entire battery line and the reduction of costs.

[0039] The other is the cluster method, where the stations are arranged in a circle, and the center of the circle is an automated system for transporting between stations. This method requires the coating process of different film layers to be completed at the same station. Therefore, the design is complex, and the station cannot complete the cell flipping function, which is not suitable for large-scale mass production needs. It has high site requirements, poor flexibility, and occupies a large area.

[0040] The present invention provides a cell film coating system. Figures 1 to 8 The cell coating system includes a conveyor line 10 for conveying cell sheets and a plurality of coating modules 20 arranged beside a transfer station 11 of the conveyor line 10 .

[0041] The conveyor line 10 has a plurality of transfer stations 11 so that the battery cells can move along the conveying direction on the conveyor line 10 .

[0042] The cell is transferred between the coating module 20 and the transfer station 11. The transfer station 11 can transfer the cell in multiple directions, so that while transferring the cell along the conveying direction, the cell can be transferred to the coating module 20 in a direction perpendicular to the conveying direction, and the processed cell is received from the coating module 20 and transferred to the next station.

[0043] It should be noted that the battery cell described in any embodiment of the present invention may be a single battery cell, or a battery cell group formed by combining multiple battery cells.

[0044] The specific implementation method of the transfer station 11 to transfer the battery cells in multiple directions is not limited. For example, a six-axis robot is provided at the transfer station, or a universal conveyor belt is provided at the transfer station 11.

[0045] The coating module 20 is located next to the transfer station 11, thus reducing the influence of the coating module 20 on the arrangement of the conveyor line 10, so that the conveyor line 10 can extend in a straight line direction or bend and extend according to the actual situation of the site, thereby improving the adaptability of the cell coating system to the site.

[0046] The plurality of coating modules 20 include:

[0047] The first coating module 21 includes at least one first coating device 211 for coating a first intrinsic layer on a first surface of a solar cell;

[0048] The second coating module 22 includes at least one second coating device 221 for coating a second intrinsic layer on the second surface of the solar cell.

[0049] The third coating module 23 comprises at least one third coating device 231 for coating an N-type doped layer on the first intrinsic layer;

[0050] The fourth coating module 24 includes at least one fourth coating device 241 for coating a P-type doped layer on the second intrinsic layer.

[0051] It should be noted that the first intrinsic layer and the second intrinsic layer are both intrinsic thin film silicon layers, wherein the intrinsic thin film silicon layer is an intrinsic amorphous silicon layer or an intrinsic microcrystalline silicon layer.

[0052] It should be noted that the above-mentioned processes and corresponding equipment for plating the first intrinsic layer, plating the second intrinsic layer, plating the N-type doped layer and plating the P-type doped layer have been maturely used in related technologies and will not be elaborated here.

[0053] The number of at least one of the first coating device 211, the second coating device 221, the third coating device 231, and the fourth coating device 241 is not less than two. For example, the number of coating devices with a longer processing time for a single cell can be set to multiple according to actual needs. Multiple means no less than two.

[0054] For the sake of convenience, it is taken as an example that there are two first coating devices 211. Each first coating device 211 performs coating processing on its own solar cell independently of each other.

[0055] For example, the time required for the first coating device 211 to process a single battery cell is 0.5 minutes. Then, when the first battery cell is transferred over, the transfer station 11 assigns the first battery cell to the first first coating device 211 for coating. During the coating process of the first first coating device 211, the transfer station 11 assigns the second battery cell to the second first coating device 211 for processing. The battery cell after coating by the first first coating device 211 returns to the conveyor line 10 and flows to the next process. In this way, the two first coating devices 211 take turns to perform coating processing. The conveyor line 10 can transfer one battery cell every 0.25 minutes, so that other stations will not be limited by the time it takes for the first coating device 211 to process a single battery cell.

[0056] In the related art, the transmission cycle of the conveyor line 10 for the battery cell is limited by the time required for the first coating device 211 to process a single battery cell. Only after the first coating device 211 completes the coating process of the battery cell can the battery cell be transferred to the next process. Therefore, the conveyor line 10 will wait in vain for a period of time.

[0057] The cell coating system in the embodiment of the present invention reduces the probability of the conveyor line 10 needing to wait for processing by a single coating device and waiting in vain, increases the number of cells processed per unit time, improves production efficiency, and reduces production costs. Each coating device independently transmits cells to and from the conveyor line 10. Even if some coating devices need maintenance or are damaged, it will not affect the transmission of cells between the conveyor line 10 and other coating devices, reduces the probability of the cell coating system stopping operation due to maintenance or damage of the coating device, and improves the utilization rate of the entire cell coating system.

[0058] It is understandable that a unified standardized connection is adopted between each coating device and the conveying line 10 so as to flexibly adjust the actual number of each coating device according to actual production needs.

[0059] In some embodiments, the number of the first coating device 211, the second coating device 221, the third coating device 231, and the fourth coating device 241 that have the longest coating time is not less than two. Figure 1 and Figure 2 If the second coating device 221 takes the longest time to coat the N-type doped layer, a second coating device 221 is set on both sides of the transfer station 11, so that two battery cells can be coated with the N-type doped layer at the same time per unit time, thereby increasing the production speed and reducing the procurement cost while meeting the production capacity requirements.

[0060] In some embodiments, the first coating device 211, the second coating device 221, the third coating device 231 and the fourth coating device 241 have the largest number of devices that require the longest coating time, so as to increase the number of cells completed by the process that requires the longest coating time per unit time, thereby improving production efficiency.

[0061] It can be understood that according to the time required for each coating process, the number of the first coating device 211, the second coating device 221, the third coating device 231 and the fourth coating device 241 is flexibly adjusted so that the number of battery cells that have completed coating the first intrinsic layer, the second intrinsic layer, the N-type doped layer and the P-type doped layer per unit time is basically the same, which reduces the probability of battery cells piling up on the conveyor line 10 due to waiting for the next coating process, reduces the possibility of any coating device being idle, improves the utilization rate of each coating device, and improves production efficiency.

[0062] Understandably, see Figure 2 and Figure 5 , each coating device in each coating module 20 is arranged adjacently along the conveying direction. By centrally arranging the coating devices of the same type, on the one hand, it is convenient for the battery cells to quickly enter the idle coating devices after arriving at the transfer station 11 corresponding to the coating module 20, thereby reducing the moving distance of the battery cells and improving the production rate; on the other hand, it is convenient for centralized management and improves the convenience of overhauling, maintaining and replacing the coating devices.

[0063] It can be understood that the first coating module 21 is located upstream of the third coating module 23 along the conveying direction, and the second coating module 22 is located upstream of the fourth coating module 24 along the conveying direction.

[0064] It is understandable that the positional relationship between the coating modules 20 is adjusted to reduce the footprint of the cell coating system.

[0065] In some embodiments, see Figure 1 and Figure 2 The first coating module 21 and the third coating module 23 are adjacent to each other along the conveying direction, so that the cell that has completed the coating process of the first intrinsic layer can be subjected to the coating process of the N-type doping layer after a shorter travel, thereby improving the production speed.

[0066] In some embodiments, the second coating module 22 is adjacent to the fourth coating module 24 along the conveying direction, so that the solar cell that has completed the second intrinsic layer coating process can be subjected to the P-type doping layer coating process after a shorter stroke, thereby increasing the production speed.

[0067] In some embodiments, the first coating module 21 and the third coating module 23 are adjacent to each other along the conveying direction, and the second coating module 22 and the fourth coating module 24 are adjacent to each other along the conveying direction, so as to further improve the production speed.

[0068] In some embodiments, see Figures 1 to 8 The conveyor line 10 includes at least one flipping station 12 for flipping the cell, so that the cell can complete the first intrinsic layer plating process and the N-type doping layer plating process on the first side, and complete the second intrinsic layer plating process and the P-type doping layer plating process on the second side.

[0069] Understandably, see Figures 1 to 8 The flipping station 12 is located between the third coating module 23 and the fourth coating module 24. After the cell is finished with one of the N-type doping layer coating process or the P-type doping layer coating process, the other process can be finished by flipping the cell.

[0070] It is understandable that the specific number of the flipping stations 12 is not limited and can be flexibly set according to the arrangement and number of each coating module 20 .

[0071] In some embodiments, the number of flipping stations 12 is one, the first coating module 21 is adjacent to the third coating module 23 along the conveying direction, and the second coating module 22 is adjacent to the fourth coating module 24 along the conveying direction; the flipping station 12 is located on the conveying line 10 between the third coating module 23 and the second coating module 22. The battery cell on the conveying line 10 first passes through the first coating module 21 to complete the first intrinsic layer coating process on the first surface, and then is transported to the third coating module 23 through the conveying line 10 to complete the N-type doping layer coating process on the first surface, and then the second surface of the battery cell is replaced by the flipping station 12 to be in the coating position, and the battery cell continues to move along the conveying direction of the conveying line 10 and is transferred to the second coating module 22 to complete the second intrinsic layer coating process on the second surface, and finally is transported to the fourth coating module 24 through the conveying line 10 to complete the P-type doping layer coating process on the second surface. Thus, the entire process flow of battery cell coating is completed.

[0072] In some embodiments, the number of flipping stations 12 is one, the first coating module 21 is adjacent to the third coating module 23 along the conveying direction, the second coating module 22 is adjacent to the fourth coating module 24 along the conveying direction, and the flipping station 12 is located on the conveying line 10 between the fourth coating module 24 and the first coating module 21. The battery cell on the conveying line 10 first passes through the second coating module 22 to complete the second intrinsic layer coating process on the second surface, and then is transported to the fourth coating module 24 through the conveying line 10 to complete the P-type doping layer coating process on the second surface, and then the first surface of the battery cell is replaced by the second surface by the flipping station 12 to be in the coating position, and the battery cell continues to move along the conveying direction of the conveying line 10 and is transported to the first coating module 21 to complete the first intrinsic layer coating process on the first surface, and finally is transported to the third coating module 23 through the conveying line 10 to complete the N-type doping layer coating process on the first surface. Thus, the entire process flow of battery cell coating is completed.

[0073] In some embodiments, there are two flipping stations 12, the second coating module 22 and the fourth coating module 24 are adjacent along the conveying direction, one flipping station 12 is located on the conveying line 10 between the first coating module 21 and the second coating module 22, and the other flipping station 12 is located on the conveying line 10 between the fourth coating module 24 and the third coating module 23. After the battery cell on the conveying line 10 passes through the first coating module 21 to complete the first intrinsic layer coating process on the first side, the first flipping station 12 is used to make the second side of the battery cell replace the first side to be in the position to be coated, and then the second coating module 22 is used to complete the second intrinsic layer coating process on the second side, and then the battery cell is transported to the fourth coating module 24 through the conveying line 10 to complete the P-type doping layer coating process on the second side, and then the second flipping station 12 is used to make the first side of the battery cell replace the second side to be in the position to be coated, and finally the battery cell is transported to the third coating module 23 through the conveying line 10 to complete the N-type doping layer coating process on the first side, thereby completing the entire process flow of battery cell coating.

[0074] In some embodiments, there are two flipping stations 12, the first coating module 21 and the third coating module 23 are adjacent along the conveying direction, one flipping station 12 is located on the conveying line 10 between the second coating module 22 and the first coating module 21, and the other flipping station 12 is located on the conveying line 10 between the third coating module 23 and the fourth coating module 24. After the battery cell on the conveying line 10 passes through the second coating module 22 to complete the second intrinsic layer coating process on the second side, the first flipping station 12 is used to make the first side of the battery cell replace the second side to be in the coating position, and then after the first coating module 21 completes the first intrinsic layer coating process on the first side, it is transported to the third coating module 23 through the conveying line 10 to complete the N-type doping layer coating process on the first side, and then the second flipping station 12 is used to make the second side of the battery cell replace the first side to be in the coating position, and finally it is transported to the fourth coating module 24 through the conveying line 10 to complete the P-type doping layer coating process on the second side, thereby completing the entire battery cell coating process.

[0075] Understandably, see Figures 1 to 8 The conveyor line 10 includes at least one heating station 13 for heating the battery cells so that the temperature of the battery cells meets the conditions for plating.

[0076] It is understandable that in order to implement the PECVD process, a vacuum environment needs to be provided for the battery cell.

[0077] In some embodiments, see Figures 1 to 8The conveyor line 10 includes at least one sheet feeding station 14 for feeding the battery cells into the vacuum environment and at least one sheet discharging station 15 for feeding the battery cells out of the vacuum environment. The conveyor line 10 and each coating module 20 form at least one vacuum treatment process section 10a along the conveying direction. The battery cells in the vacuum treatment process section 10a are in a closed vacuum environment so that the battery cells can be coated under the conditions required by the PECVD process. Through the sheet feeding station 14 and the sheet discharging station 15, the vacuum environment can be separated from the external environment, reducing the possibility of external gas entering the vacuum environment, so that the vacuum degree in the vacuum environment is maintained within the required range of the PECVD process.

[0078] In some embodiments, see Figures 1 to 8 Each vacuum processing section is provided with a sheet feeding station 14, a sheet discharging station 15 and a heating station 13. The sheet feeding station 14 is located at the head end of the vacuum processing section 10a, the heating station 13 is located between the sheet feeding station 14 and the transmission station 11, and the sheet discharging station 15 is located at the end of the vacuum processing section 10a. While realizing the completion of the PECVD process of the cell, the travel of the cell in the vacuum environment is reduced, thereby reducing the volume of the required vacuum environment and reducing the operating cost of maintaining the vacuum environment.

[0079] It can be understood that the wafer loading station 14, the heating station 13, the transfer station 11, the wafer discharging station 15 and each coating device are provided with a chamber to facilitate the movement of the battery cells and form a vacuum environment.

[0080] See also Figure 4 and Figure 5 After the cell enters the first feeding station 14, the chamber of the feeding station 14 is isolated from the outside world, and the vacuum is drawn. The chamber of the feeding station 14 is connected to the chamber of the heating station 13, and the cell enters the heating station 13. After being heated in the heating station 13, the cell enters the chamber of the first coating device 211 through the chamber of the transfer station 11 to coat the first intrinsic layer, and then enters the chamber of the third coating device 231 to coat the N-type doped layer. After completion, the cell leaves the vacuum environment through the chamber of the discharge station 15. After the cell is flipped over at the flipping station 12, the cell enters the second feeding station 14 and the second heating station 13 in turn, and then coats the second intrinsic layer and the P-type doped layer in turn. Finally, the cell leaves the vacuum environment through the chamber of the second discharge station 15 to complete the PECVD process.

[0081] See also Figure 1 and Figure 2, after the battery cell enters the first feeding station 14, the chamber of the feeding station 14 is isolated from the outside, and the vacuum is drawn. The chamber of the feeding station 14 is connected with the chamber of the heating station 13, and the battery cell enters the heating station 13. After the battery cell is heated in the heating station 13, it enters the chamber of the second coating device 221 through the chamber of the transfer station 11 to plate the second intrinsic layer. After completion, the battery cell leaves the vacuum environment through the chamber of the discharge station 15. After the battery cell is flipped at the flipping station 12, the battery cell enters the second feeding station 14 and the second heating station 13 in turn, and then the first intrinsic layer and the N-type doped layer are plated in turn. After passing through the chamber of the second discharge station 15, the battery cell leaves the vacuum environment. After the battery cell is flipped at the second flipping station 12, the battery cell enters the third feeding station 14 and the third heating station 13 in turn, and then the P-type doped layer is plated. Finally, the vacuum environment is left through the chamber of the third sheet discharging station 15, and the PECVD process is completed.

[0082] It is understandable that in some cases, the same coating layer needs to be plated multiple times, that is, each coating layer is composed of multiple sub-coating layers, and the thickness of each sub-coating layer can be consistent or different. Therefore, the coating of each sub-coating layer can be carried out in the same type of coating device in different conveying directions.

[0083] For example, see Figure 8 The cell is in the first coating device 211 along the conveying direction, which is marked as I 1(1) After the first coating device 211 of the first intrinsic layer is finished, the cell is transferred from the transfer station 11 to the second first coating device 211, which is marked as I. 1(2) The first coating device 211 of the embodiment of the present invention is used to coat the sub-coating layer of the first intrinsic layer for the second time, and so on, until the nth first coating device 211, which is marked as I 1(n) The first coating device 211 completes the n-th coating of the sub-layers of the first intrinsic layer, so that the number of sub-layers of the first intrinsic layer meets the design requirements.

[0084] Similarly, see Figure 8 The second intrinsic layer, the P-type doped layer and the N-type doped layer can all be sequentially coated in each coating device to complete the sub-layer coating work, so as to improve the production efficiency.

[0085] In some embodiments, see Fig. 9 At least one transfer station 11 is provided with a first coating device 211 on one side along the conveying direction, and a third coating device 231 on the other side. On the premise of meeting the required number of first coating devices 211 and third coating devices 231, the space utilization rate is improved, so that the battery cells can be transferred from the first coating device 211 to the third coating device 231 more quickly, thereby improving the production rate.

[0086] In some embodiments, see Fig. 9 At least one transfer station 11 is provided with a second coating device 221 on one side along the conveying direction, and a fourth coating device 241 on the other side. On the premise of meeting the required number of second coating devices 221 and fourth coating devices 241, the space utilization rate is improved, so that the battery cells can be transferred from the second coating device 221 to the fourth coating device 241 more quickly, thereby improving the production rate.

[0087] The various embodiments / implementations provided in this application can be combined with each other without causing any contradiction.

[0088] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A cell coating system, characterized in that: The cell coating system comprises: A conveyor line for conveying battery cells, the conveyor line having a plurality of transfer stations; A plurality of coating modules are arranged beside the transmission station of the conveyor line, and the coating modules and the transmission station are used to transmit the battery cells. The transmission station can transmit the battery cells in multiple directions, so as to realize the transmission of the battery cells along the transmission direction and the transmission of the battery cells to the coating module in a direction perpendicular to the transmission direction, and receive the processed battery cells from the coating module and transmit them to the next station. The plurality of coating modules include: A first coating module, comprising at least one first coating device for coating a first intrinsic layer on a first surface of a solar cell; A second coating module, comprising at least one second coating device for coating a second intrinsic layer on a second surface of the solar cell; A third coating module, comprising at least one third coating device for coating an N-type doped layer on the first intrinsic layer; The fourth coating module comprises at least one fourth coating device for coating a P-type doped layer on the second intrinsic layer; wherein, the number of at least one of the first coating device, the second coating device, the third coating device and the fourth coating device is not less than two, at least one of the transfer stations is provided with the first coating device on one side along the conveying direction, and the third coating device on the other side, at least one of the transfer stations is provided with the second coating device on one side along the conveying direction, and the fourth coating device on the other side, and among the first coating device, the second coating device, the third coating device and the fourth coating device, the number of those that require the longest coating time is the largest.

2. The cell coating system according to claim 1, characterized in that: Among the first coating device, the second coating device, the third coating device and the fourth coating device, the number of the devices with the longest coating time required is not less than two.

3. The cell coating system according to claim 1, characterized in that: The first coating module is adjacent to the third coating module along the conveying direction; and\or, the second coating module is adjacent to the fourth coating module along the conveying direction.

4. The cell coating system according to claim 1, characterized in that: The conveying line includes at least one flipping station for flipping the battery cell, and the flipping station is located between the third coating module and the fourth coating module.

5. The cell coating system according to claim 4, characterized in that: The number of the flipping station is one, the first coating module is adjacent to the third coating module along the conveying direction, and the second coating module is adjacent to the fourth coating module along the conveying direction; the flipping station is located on the conveying line between the third coating module and the second coating module; or, the flipping station is located on the conveying line between the fourth coating module and the first coating module.

6. The cell coating system according to claim 4, characterized in that: The number of the flipping stations is two, the first coating module is adjacent to the third coating module along the conveying direction, one flipping station is located on the conveying line between the second coating module and the first coating module, and the other flipping station is located on the conveying line between the third coating module and the fourth coating module; or, the second coating module is adjacent to the fourth coating module along the conveying direction, one flipping station is located on the conveying line between the first coating module and the second coating module, and the other flipping station is located on the conveying line between the fourth coating module and the third coating module.

7. The cell coating system according to claim 1, characterized in that: The conveyor line includes at least one heating station for heating battery cells, at least one sheet-feeding station for delivering battery cells into a vacuum environment, and at least one sheet-discharging station for delivering battery cells out of the vacuum environment; the conveyor line and each of the coating modules form at least one vacuum treatment process section along the conveying direction, and each of the vacuum treatment sections is provided with the sheet-feeding station, the sheet-discharging station and the heating station; the sheet-feeding station is located at the head end of the vacuum treatment process section, the heating station is located between the sheet-feeding station and the transmission station, and the sheet-discharging station is located at the end of the vacuum treatment process section.

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