Film coating equipment and repairing method for battery piece

Abstract

The invention relates to the field of solar cells, and provides coating equipment and a repairing method for a battery piece. The coating film repairing equipment comprises a reaction chamber, a film box and a spraying device, wherein a heater and a tray are arranged in the reaction chamber; the piece box comprises a base and a box body, the base is suitable for being mounted on the tray, the box body is arranged above the base, a battery piece with at least two cutting surfaces is suitable for being placed in the box body, and a processing window communicated with the cutting surfaces is formed in the side wall of the box body; the spraying device comprises a spraying plate and spraying pipes arranged at the bottom of the spraying plate at intervals, the spraying pipes are detachably installed at the bottom of the spraying plate, and air outlet faces are arranged on the spraying plate and the spraying pipes. According to the invention, a plurality of cutting surfaces of the battery piece can be efficiently coated at the same time, the uniformity of the cutting surface film layer of the battery piece is improved, the defects are effectively repaired, the composite loss is reduced, and the open-circuit voltage and the filling factor are improved, so that the effects of improving the assembly power and reducing the assembly power generation cost are achieved.

Description

Technical Field

[0001] The present invention relates to the field of solar cells, and further to a coating device and a repair method for a solar cell. Background Art

[0002] Coating repair refers to the formation of a dense, corrosion-resistant, repairable film on the surface of the cell. In the manufacturing process of photovoltaic cells, the repair of the cut surface is one of the key steps to improve the conversion efficiency and stability of the cell.

[0003] At present, the coating repair of the cut surface of the battery cell is generally carried out by stacking the battery cells in a cell box, and coating the cut surface exposed outside the cell box with a thin film through gas saturation. Currently, single-sided open cell boxes are commonly used, but there are various ways to divide the existing battery cells, and the existing battery cells have more than one cut surface, which leads to the need to coat the same batch of battery cells twice, and the coating efficiency is low, which cannot meet the needs of efficient production. In addition, coating the two cut surfaces of the battery cell separately is also prone to uneven coating and serious plating. Summary of the invention

[0004] In view of the above technical problems, the purpose of the present invention is to provide a coating device and a repair method for a battery cell, which can efficiently coat multiple cut surfaces of a battery cell at the same time, improve the coating efficiency, improve the uniformity of the film layer on the cut surface of the battery cell, effectively repair defects, reduce composite losses, and improve the open circuit voltage and fill factor, thereby achieving the effect of increasing component power and reducing component power generation costs.

[0005] In order to achieve the above-mentioned object, the present invention provides a coating device for a battery cell, using a coating repair method for a cut surface of a battery cell as described in any one of the above-mentioned preferred embodiments; the coating repair device comprises a reaction chamber, a rotating device, a cell box, a spray device, an air path system and an exhaust device;

[0006] A heater and a tray are provided in the reaction chamber;

[0007] The rotating device is suitable for driving the tray in the reaction chamber to rotate;

[0008] The sheet box comprises a base and a box body, wherein the base is suitable for being mounted on the tray, the box body is arranged above the base, the box body is suitable for placing a battery sheet having at least two cutting surfaces, and a processing window is arranged on the side wall of the box body to communicate with the outside world about the cutting surface; the spray device comprises a spray plate and a spray pipe arranged at intervals at the bottom of the spray plate, the spray pipe is detachably mounted at the bottom of the spray plate, and both the spray plate and the spray pipe are provided with an air outlet surface;

[0009] The gas circuit system is connected to the spray device and is suitable for introducing reactants and carrier gas into the spray device;

[0010] The gas extraction device is suitable for exhausting the gas in the reaction chamber.

[0011] In some embodiments, the spray device is any one of E-type, F-type, T-type, and C-type, the spray plate is arranged above the tray and symmetrically arranged relative to the central axis of the tray, and the bottom of the spray plate is provided with an air outlet surface on both sides of the central axis of the tray; the spray pipe is arranged in the middle or at both ends of the bottom of the spray plate, and the spray pipe is provided with an air outlet surface on the side facing the film box.

[0012] In some embodiments, a plurality of threaded mounting holes are provided at intervals at the bottom of the spray plate, and a mounting thread is provided at the top of the spray pipe, and the spray pipe is detachably mounted in the threaded mounting hole at the bottom of the spray plate through the mounting thread;

[0013] The distance between the shower plate and the processing window of the film box facing the shower plate is 1 cm;

[0014] The distance between the spray pipe and the processing window of the film box facing away from the central axis of the tray is 6-10 cm.

[0015] In some embodiments, a tilting structure is further included, wherein the box body is arranged above the base through the tilting structure, and the tilting structure includes a rotating shaft and a lifting member. One end of the bottom of the box body can be rotatably installed on the base through the rotating shaft, and the other end is connected to the base through a lifting member. The lifting member can drive the other end of the bottom of the box body to move upward, so that the diagonal of the box body is arranged parallel to the central axis of the tray.

[0016] In some embodiments, the box body includes a frame and side panels, the frame includes a bottom panel, a front panel and a rear panel, the front panel and the rear panel are arranged above the bottom panel and relatively located on opposite sides of the bottom panel, and the side panels are detachably mounted on other sides of the bottom panel;

[0017] And / or, a blocking member is further provided at the processing window of the box body, and the blocking member is suitable for abutting against the cut surface of the battery cell.

[0018] According to another aspect of the present application, a method for repairing a coating film on a cut surface of a cell is further provided, comprising obtaining a cut cell, wherein the cell has at least two cut surfaces;

[0019] Stacking a plurality of the battery cells into a cell box, wherein the cell box has at least two processing windows matching the cutting surfaces, so that all the cutting surfaces of the battery cells are connected to the outside through the processing windows;

[0020] Placing the wafer box on a tray in a reaction chamber so that each processing window of the wafer box matches the gas outlet surface of a spray plate and / or a gas outlet surface of a spray pipe of the spray device;

[0021] Reactants and carrier gas are introduced into the gas outlet surface of the spray device that matches the processing window through the gas path system, so that a repair film is formed on all cut surfaces of the battery cell.

[0022] In some embodiments, the wafer box is placed on a tray in the reaction chamber so that each processing window of the wafer box matches the gas outlet surface of the spray plate and / or the gas outlet surface of the spray pipe of the spray device, specifically comprising: placing the wafer box with two adjacent processing windows horizontally on the tray, one processing window of the wafer box faces upward and matches the spray plate at the top of the spray device, and the other processing window faces away from the central axis of the tray and matches the spray pipe in the middle or at both ends of the spray device, and the uniformity of the two cut surfaces of the battery cell is controlled by adjusting the gas outlet of the spray device on both sides of the diagonal of the wafer box;

[0023] Alternatively, the film box having two adjacent processing windows is tiltedly placed on the tray via a tilting structure so that the diagonal of the film box is parallel to the central axis of the tray, and the two processing windows of the film box are facing upward and match the spray plate of the spray device and / or the spray pipes in the middle and at both ends of the spray device.

[0024] In some embodiments, the wafer box is placed on a tray in the reaction chamber so that each of the processing windows of the wafer box matches the gas outlet surface of the spray plate and / or the gas outlet surface of the spray pipe of the spray device, specifically comprising: placing the wafer box having two relative processing windows horizontally on the tray so that one of the processing windows of the wafer box faces the central axis of the tray and matches the spray pipe in the middle of the spray device, and the other processing window is away from the central axis of the tray and matches the spray pipes at both ends of the spray device.

[0025] In some embodiments, the wafer box is placed on a tray in the reaction chamber so that each of the processing windows of the wafer box matches the gas outlet surface of the spray plate and / or the gas outlet surface of the spray pipe of the spray device, specifically comprising: placing the wafer box with three adjacent processing windows horizontally on the tray so that one of the processing windows of the wafer box faces the central axis of the tray and matches the spray pipe in the middle of the spray device, one of the processing windows faces upward and matches the spray plate of the spray device, and the other processing window is away from the central axis of the tray and matches the spray pipes at both ends of the spray device.

[0026] Compared with the prior art, the cell coating device and repair method provided by the present invention have at least one of the following beneficial effects:

[0027] 1. By matching the multiple cutting surfaces of the battery cell with the multiple processing windows of the cell box, all the cutting surfaces of the battery cell are connected to the outside through the processing windows, and then by increasing the air outlet surface of the spray pipe in the vertical direction, the multiple processing windows of the cell box are matched with the air outlet surface of the spray plate on the spray device and / or the air outlet surface of the spray pipe, so that the spray device can evenly coat all the processing windows, meet the batch coating requirements of the battery cell, improve the uniformity of the film layer on the cutting surface of the battery cell, effectively repair defects, reduce composite losses, and improve the open circuit voltage and fill factor, thereby achieving the effect of increasing the power of the component and reducing the cost of component power generation.

[0028] 2. The spray pipe can be detachably installed on the spray plate through the mounting threads and mounting threaded holes, which is convenient for assembly and maintenance of the spray device; the spray pipe and the spray plate can also be arbitrarily combined to make the spray device into C-type, F-type, T-type or E-type to adapt to different coating scenarios.

[0029] 3. The box body is suitable for tilting through the lifting piece, so that each processing window of the box body matches the multiple air outlet surfaces of the spray device, increasing the adaptability of the spray device and the film box, and improving the coating efficiency and coating uniformity.

[0030] 4. The side panels can be detachably mounted on the sides of the frame, so that the sides without the side panels installed form processing windows, which improves the versatility of the film box and eliminates the need to customize multiple film boxes separately, reducing costs and increasing assembly efficiency.

[0031] 5. The blocking member is suitable for being arranged inside the processing window and abutting against the cut surface of the battery cell, so as to prevent the battery cells inside the box body from falling out when the tray rotates, thereby increasing the safety performance of the cell box. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The preferred implementation modes will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present invention.

[0033] Figure 1 It is a flow chart of a method for repairing the coating on the cut surface of a battery cell;

[0034] Figure 2 It is a cross-sectional view of a device for repairing the coating of a cut surface of a cell;

[0035] Figure 3 It is the structural diagram of the film box;

[0036] Figure 4It is the structural diagram of the T-type spray device;

[0037] Figure 5 It is the structural diagram of the E-type spray device;

[0038] Figure 6 is a position diagram of the blocking member;

[0039] Figure 7 is a diagram showing the position of a blocking member in another embodiment;

[0040] Figure 8 It is the structural diagram of the film box;

[0041] Fig. 9 This is the installation diagram of the side panel;

[0042] Fig.10 This is a disassembled diagram of the side panel.

[0043] Description of Figure Numbers:

[0044] Battery cell 1, cutting surface 10, cell box 2, processing window 20, base 21, box body 22, frame 221, bottom plate 2211, front plate 2212, rear plate 2213, top plate 2214, slide 2215, movable plate 2216, side plate 222, blocking member 223, spray device 3, gas outlet surface 30, spray plate 31, spray pipe 32, rotating device 4, reaction chamber 5, heater 51, tray 52, heater 53, exhaust device 6. DETAILED DESCRIPTION

[0045] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0046] In order to simplify the drawings, only the parts related to the invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0047] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0048] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance. It should be noted that the above embodiments can be freely combined as needed. The above are only preferred implementations of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be regarded as the scope of protection of the present invention.

[0050] refer to Figures 2 to 4 The present invention provides a coating device for a battery cell, the coating repair device comprises a reaction chamber 5, a rotating device 4, a sheet box 2, a spraying device 3, an air path system and an exhaust device 6, a heater 53 and a tray 52 are arranged in the reaction chamber 5; the rotating device 4 is suitable for driving the tray 52 in the reaction chamber 5 to rotate; the sheet box 2 comprises a base 21, a box body 22 and a tilting structure, the base 21 is suitable for being installed on the tray 52, the box body 22 is arranged above the base 21, and the box body 22 is suitable for placing a A battery cell 1 with at least two cutting surfaces 10, a processing window 20 for communicating the cutting surface 10 with the outside is provided on the side wall of the box body 22; the spray device 3 includes a spray plate 31 and a spray pipe 32 arranged at an interval at the bottom of the spray plate 31, the spray pipe 32 is detachably installed at the bottom of the spray plate 31, and a gas outlet surface 30 is provided on the spray plate 31 and the spray pipe 32; the gas path system is connected to the spray device 3 and is suitable for introducing reactants and carrier gas into the spray device 3; the exhaust device 6 is suitable for exhausting the gas in the reaction chamber 5.

[0051] In this embodiment, the coating repair equipment of the cut surface 10 of the battery cell 1 can efficiently coat multiple cut surfaces 10 of the battery cell 1 at the same time, improve the uniformity of the film layer of the cut surface 10 of the battery cell 1, effectively repair defects, reduce composite losses, and improve open circuit voltage and fill factor, thereby achieving the effect of increasing component power and reducing component power generation costs.

[0052] Specifically, the reaction chamber 5 is preferably a circular chamber, but is not limited thereto, and may be other shapes according to actual needs. The material of the tray 52 is preferably graphite, metal or the like, but is not limited thereto, and may be any other suitable material according to actual conditions. A plurality of film boxes 2 may be placed on the tray 52. ​​The rotating device 43 is disposed at the bottom of the reaction chamber 5. The rotating device 43 preferably includes a rotating shaft and a motor, but may also include other components as required. The tray 524 is disposed above the rotating device 43, and the bottom of the tray 524 is connected to the rotating device 43, and the rotating device 43 causes the tray 524 to rotate. The overall structure of the spray device 3 is any one of the E-type, F-type, T-type, and C-type. The spray plate 31 is disposed above the tray 52 and is symmetrically disposed relative to the central axis of the tray 52. ​​The bottom of the spray plate 31 is provided with an air outlet surface 30 on both sides of the central axis of the tray 52; the spray pipe 32 is disposed in the middle and / or at both ends of the bottom of the spray plate 31, and the spray pipe 32 is provided with an air outlet surface 30 on the side facing the film box 2. Specifically, refer to Figure 4 The spray device 3 is T-shaped, and there is one spray pipe 32. One spray pipe 32 is arranged in the middle of the bottom of the spray plate 31 and along the central axis of the tray 52. ​​Both sides of the middle spray pipe 32 are provided with an air outlet surface 30. Figure 5 The spray device 3 is of E type, and there are three spray pipes 32. One spray pipe 32 is arranged in the middle of the bottom of the spray plate 31 and along the central axis of the tray 52. ​​An air outlet surface 30 is arranged on both sides of the middle spray pipe 32. Two spray pipes 32 are arranged at both ends of the bottom of the spray plate 31, and the side of the spray pipe 32 close to the central axis of the tray 52 is provided with an air outlet surface 30. The spray pipes 32 are relatively located in the middle and both ends of the spray plate 31. The middle spray pipe 32 is suitable for spraying reactants all around, and the spray pipes 32 at both ends are suitable for spraying reactants toward the central axis of the tray 52. ​​It is worth noting that the distance between the spray plate 31 and the processing window 20 of the wafer box 2 facing the spray plate 31 is 1 cm; the distance between the spray pipe 32 and the processing window 20 of the wafer box 2 facing away from the central axis of the tray 52 is 6-10 cm, which is used to assist in uniform coating of the side wall.

[0053] Preferably, a plurality of mounting threaded holes are provided at intervals at the bottom of the spray plate 31, and mounting threads are provided at the top of the spray pipe 32. The spray pipe 32 can be detachably installed in the mounting threaded hole at the bottom of the spray plate 31 through the mounting threads. In this embodiment, the spray pipe 32 can be detachably installed on the spray plate 31 through the mounting threads and the mounting threaded holes, which is convenient for assembling and repairing the spray device; the spray pipe 32 and the spray plate 31 can also be arbitrarily combined, so that the spray device 3 is C-shaped, F-shaped, T-shaped or E-shaped, so as to adapt to different coating scenarios. It is worth noting that the spray pipe 32 can also be provided with other detachable structures to be installed on the spray plate 31, such as screws, card plates, card slots, slide rails, etc.

[0054] Further, refer to Figures 6 to 10The box body 22 includes a frame 221 and side panels 222. The frame 221 includes a bottom plate 2211, a front plate 2212 and a rear plate 2213. The front plate 2212 and the rear plate 2213 are arranged above the bottom plate 2211 and are relatively located on opposite sides of the bottom plate 2211. The side panels 222 can be detachably installed on other sides of the bottom plate 2211. In this embodiment, the side panels 222 can be detachably installed on the sides of the frame 221, so that the sides where the side panels 222 are not installed form processing windows 20, thereby improving the versatility of the film box 2, eliminating the need to customize multiple film boxes 2 separately, reducing costs, and increasing assembly efficiency. Specifically, the frame 221 is C-shaped, and processing windows 20 are provided on the top and left and right sides of the frame 221. The side panels 222 are installed at the processing windows 20 to close the processing windows 20, so that the required processing windows 20 are connected to the outside world. Reference Fig. 9 and Fig.10 In the present application, the detachable structure of the side panel 222 is through a slide groove 2215 and a slider, that is, a slide groove 2215 is provided on both sides of the interior of the frame 221 along the sliding direction of the side panel 222, and sliders are also provided on both sides of the side panel 222. The side panel 222 is detachably mounted on the frame 221 through the slide groove 2215 and the slider. Of course, the detachable structure of the side panel 222 can also be fastened by other fastening components such as screws and fixing blocks, which will not be further elaborated in the present application. It is worth noting that the processing window 20 of the box body 2 is suitable for matching with the cutting surface 10 of the battery cell 1 through the detachable side panel 222 to expand the scope of use. The cell box 2 is provided with two adjacent processing windows 20 or two relative processing windows 20 or three adjacent processing windows 20, so that it can simultaneously meet the coating requirements of a battery cell 1 with two adjacent cutting surfaces 10, a battery cell 1 with two relative cutting surfaces 10, and a battery cell 1 with three adjacent cutting surfaces 10. Reference Fig. 9 When the cell 1 has a cutting surface 10, side panels 222 are provided on both the left and right sides of the box body 2, so that a processing window 20 is formed on the top of the box body 2. Fig.10 When the cell 1 has two adjacent cutting surfaces 10, a side plate 222 is provided on the left side of the box body 1, so that a processing window 20 is formed on the right side and the top side of the box body 1. Figure 6 and Figure 7 When the cell 1 has two oppositely disposed cutting surfaces 10, a side plate 222 is disposed on the top side of the box body 2, so that processing windows 20 are formed on the left and right sides of the box body 1. Figure 8 When the battery cell 1 has three adjacent cutting surfaces 10 , the left side, right side and top side of the box body 2 are not provided with side panels 222 , so that the left side, right side and top side of the box body 2 form processing windows 20 .

[0055] Furthermore, the box body 2 has two adjacent processing windows 20. The box body 22 is arranged above the base 21 through a tilting structure. The tilting structure can adjust the tilting angle of the box body 22. The tilting structure includes a rotating shaft and a lifting member. One end of the bottom of the box body 22 can be rotatably installed on the base 21 through the rotating shaft, and the other end is connected to the base 21 through a lifting member. The lifting member can drive the other end of the bottom of the box body 22 to move upward, so that the diagonal of the box body 22 is arranged parallel to the central axis of the tray 52.

[0056] In this embodiment, the box body 22 is suitable for being tilted by a lifting member, so that each processing window 20 of the box body 22 matches the multiple air outlet surfaces 30 of the spray device 3, increasing the adaptability of the spray device 3 and the film box 2, and improving the coating efficiency and coating uniformity. Specifically, a rotating shaft is provided at one end of the box body 22, and a lifting member is provided at the other end. The lifting member is raised so that the other end of the box body 22 is raised, so that the box body 22 is tilted. Preferably, the lifting member lifts the film box 2 until the diagonal of the film box 2 is parallel to the central axis of the tray 52. ​​Preferably, the lifting member of the present application includes but is not limited to a telescopic rod, a screw rod, etc. At the same time, the tilting of the box body 22 can also be achieved by a support member. An abutment groove is provided at the bottom of the box body 22, and another abutment groove is provided on the base 21. The support member is installed to abut the two abutment grooves, and the box body 22 is tilted at different angles by replacing support members of different lengths. At the same time, the support member can be replaced with a telescopic member, which is within the protection scope of the present application.

[0057] Further, refer to Figure 8The processing window 20 of the box body 22 is also provided with a blocking member 223, and the blocking member 223 is suitable for abutting against the cut surface 10 of the battery cell 1. In this embodiment, the blocking member 223 is suitable for being arranged inside the processing window 20 and abutting against the cut surface 10 of the battery cell 1, so as to prevent the battery cell 1 inside the box body 22 from falling out when the tray 52 rotates, thereby increasing the safety performance of the cell box 2. Specifically, the box body 22 has three processing windows 20, namely, the processing windows 20 located at the top and two sides of the box body 22. The battery cell 1 has at least two cutting surfaces 10. At this time, the processing window 20 on one side of the box body 22 always needs to be open and the battery cell 1 needs to be placed through this processing window 20. Therefore, the processing window 20 on this side of the box body 22 does not need to be provided with a blocking member 223, and the top and the other side of the box body 22 need to be provided with a blocking member 223. At this time, the blocking member 223 located at the top of the box body 22 is preferably provided at one end of the processing window 20 close to the processing window 20 without the blocking member 223, so as to prevent the battery cell 1 from being thrown upward, and at the same time, it can also reduce the blocking of the blocking member 223 to the middle part of the cutting surface 10. The blocking member 223 on the other side of the box body 22 is also preferably provided at the upper and lower ends of the processing window 20. The position of the blocking member 223 can be set according to actual needs, and this application will not be further elaborated. The blocking member 223 is preferably a blocking bar or a blocking edge, which is used to reduce the covering area of ​​the cutting surface 10 of the battery cell 1 by the blocking member 223 to ensure the coating effect of the cutting surface 10.

[0058] Further, refer to Figure 6 and Figure 7 The processing window 20 of the box body 22 can also be located on the opposite sides of the box body 22. The battery cell 1 has two opposite cutting surfaces 10. The two opposite cutting surfaces 30 of the battery cell 1 are purified and coated at the same time to ensure the uniform passivation and coating quality of each battery cell 1, reduce the surface recombination loss, and improve the photoelectric conversion efficiency. The frame 221 includes a bottom plate 2211, a front plate 2212, a rear plate 2213, and a top plate 2214. The top plate 2214 is the side plate 222 in the above embodiment. The size of the top plate 14 is equivalent to the spacing distance between the front plate 2212 and the rear plate 2213. After the battery cell 1 is horizontally loaded into the box body 2, it is pressed by the top plate 2214, which can improve the stability during processing, thereby improving the processing efficiency and avoiding the problem of winding plating. A fixing groove is provided on the adjacent side of the front plate 2212 and the rear plate 2213. The fixing groove is suitable for clamping the left and right ends of the battery cell 1, which can effectively prevent the battery cell 1 from moving and colliding during the coating process and reduce the risk of surface damage.

[0059] refer to Figure 6 and Figure 7The blocking member 223 may also include a plurality of columns, and a plurality of slots are respectively provided at the front and rear ends of the top plate 2214. The columns are suitable for being fixed in the slots and abutting against the front and rear ends of the battery cell 1, which can effectively fix the battery cell 1 and keep the battery cell 1 stable during the passivation process. In a modified embodiment, a fixing slot may be further provided on the opposite side of the side plate 222, and the fixing slot is suitable for fixing the two ends of the battery cell 1 by being fixed.

[0060] It is worth noting that the fixing grooves, columns and blocking members all play the role of fixing the battery cells 1 , and they can be reasonably selected according to the number and positions of the processing window positions 20 of the cell box 2 .

[0061] Furthermore, the box body 22 further includes a movable plate 2216 , which can be detachably arranged on the top of the bottom plate 2211 , and the top of the movable plate 2216 is suitable for stacking the battery cells 1 .

[0062] In this embodiment, the movable plate 2216 is separable from the base plate 2211, and the top of the movable plate 2216 is suitable for stacking the battery cells 1, so that the battery cells 1 can be loaded onto the movable plate 2216 by automated assembly tools such as manipulators, and then the movable plate 2216 can be placed in a cell box by automated assembly tools such as manipulators, making automated assembly easier.

[0063] Specifically, the movable plate 2216 is detachably arranged on the upper surface of the bottom plate 2211, and is used to load the battery cell 1 for sidewall passivation. The two sides of the movable plate 2216 may also be provided with a fixed structure 2 to fix the battery cell 1. First, the battery cell 1 is cut, and the cut battery cells 1 are sucked by a robot and dropped on the movable plate 2216. After all 1000 battery cells 1 have fallen on the movable plate 2216, the movable plate 2216 is placed on the bottom plate 2211 of the film box by a robot, and the top plate 2214 is covered. Finally, the film box is placed in the subsequent coating repair equipment by a robot. The film box structure is simple and reasonable, which makes the automated assembly easier, and the subsequent coating is also easier. It can also improve the coating effect, avoid circumferential plating, and greatly improve the passivation efficiency of the middle film of the three-piece film.

[0064] Furthermore, it also includes a positioning component, which includes a plurality of first positioning members and a plurality of second positioning members, wherein the plurality of first positioning members are respectively arranged on the side of the front plate 2212 and the rear plate 2213 away from each other; and the plurality of second positioning members are arranged on the top of the front plate 2212 and the rear plate 2213.

[0065] In this embodiment, the positioning assembly facilitates the rotation of the film box in the sidewall passivation device by an automated tool, and also facilitates other processing components to accurately position the film box, thereby facilitating automated placement and positioning.

[0066] Specifically, two first positioning members are respectively arranged on the outside of the front plate 2212 and the rear plate 2213, and two second positioning members are arranged on the upper surface of the top of the front plate 2212 and the rear plate 2213. A plurality of third positioning members are also included, and the third positioning members are arranged at intervals at the bottom of the base plate 2211. The second positioning members are arranged on the top of the front plate 2212 and the rear plate 2213 and the third positioning member is arranged on the base plate 2211, so as to facilitate the film box to be sent to the subsequent side wall passivation equipment through the automation tool, and the first positioning member is arranged on the side wall of the front plate 2212 and the rear plate 2213, so as to facilitate the rotation of the film box in the side wall passivation equipment through the automation tool, and also facilitate the accurate positioning of the film box by other processing parts, and the processing parts include but are not limited to the cylinder. Therefore, the first positioning member, the second positioning member and the third positioning member are arranged on the film box, which is helpful for the automatic placement and positioning of the film box. It is worth noting that the specific number and arrangement of the first positioning member, the second positioning member and the third positioning member are not further limited in this application, and the number and arrangement of the positioning components can be appropriately adjusted according to actual processing needs. It is worth noting that the positioning member is preferably a pin, but is not limited thereto, and can also be other suitable positioning members.

[0067] Further, refer to Figure 1 The present invention also provides a method for repairing the coating of the cut surface of a battery cell. The coating repair method matches the multiple cut surfaces 10 of the battery cell 1 with the multiple processing windows 20 of the cell box 2, so that all the cut surfaces 10 of the battery cell 1 are connected to the outside through the processing windows 20, and then adds a vertical air outlet surface 30 of the spray pipe 32 on the spray device 3, so that the multiple processing windows 20 of the cell box 2 are matched with the air outlet surface 30 of the spray plate 31 on the spray device 3 and / or the air outlet surface 30 of the spray pipe 32, so that the spray device 3 can uniformly coat all the processing windows 20, meet the batch coating requirements of the battery cell 1, improve the uniformity of the film layer of the cut surface 10 of the battery cell 1, effectively repair defects, reduce composite losses, and improve the open circuit voltage and fill factor, thereby achieving the effect of increasing the power of the component and reducing the cost of component power generation. A method for repairing the coating of the cut surface of a battery cell specifically includes:

[0068] S101 obtains a cut battery cell 1, the battery cell 1 having at least two cutting surfaces 10. In this embodiment, the battery cell 1 includes but is not limited to any one of a three-piece slice, a four-piece slice, a five-piece slice, and a six-piece slice. Taking a three-piece slice as an example, the three-piece slices on the left and right sides have a cutting surface 10, and the three-piece slice in the middle has two opposite cutting surfaces 10. Taking a four-piece slice as an example, it is obtained by cross segmentation, and the four-piece slice has two adjacent cutting surfaces 10.

[0069] S102 stacks a plurality of cells 1 and places them in a sheet box 2, which has at least two processing windows 20 matching the cut surfaces 10, so that all the cut surfaces 10 of the cells 1 are connected to the outside through the processing windows 20. In this embodiment, the sheet box 2 matches the size of the cells 1, and the cells 1 are stacked and placed in the sheet box 2, and are stacked tightly without damaging the cells 1. Each sheet box 2 is loaded with 1,000 cells 1, and the sheet box 2 containing the cells 1 is placed in the area to be coated. The position of the processing window 20 of the sheet box 2 is different according to the position of the cut surface 10 of the cell 1. The ultimate goal of this embodiment is to connect all the cut surfaces 10 of the cell 1 to the outside through the processing windows 20, so that the subsequent simultaneous coating is performed through the spray device 3, thereby improving the uniformity of the film layer of the cut surface 10 of the cell 1, effectively repairing defects, reducing composite losses, and improving the open circuit voltage and fill factor, thereby achieving the effect of increasing the power of the component and reducing the cost of component power generation.

[0070] S103: Place the wafer box 2 on the tray 52 in the reaction chamber 5, so that each processing window 20 of the wafer box 2 matches the gas outlet surface 30 of the spray plate on the spray device 3 and / or the gas outlet surface 30 of the spray pipe 32. Specifically, the spray device 3 includes a spray plate 31 and a plurality of spray pipes 32. Taking the four-part wafer as an example, the wafer box 2 with two adjacent processing windows 20 is horizontally placed on the tray 52, one processing window 20 of the wafer box 2 faces upward and matches the spray plate 31 at the top of the spray device 3, and the other processing window 20 faces away from the central axis of the tray 52 and matches the spray pipe 32 in the middle or at both ends of the spray device 3. In this embodiment, a processing window 20 of the chip box 2 matches the air outlet surface 30 of the spray plate 31, and another processing window 20 matches the air outlet surface 30 of the spray pipe 32 facing away from the central axis of the tray 52, that is, the processing windows 20 of the chip box 2 correspond one-to-one to the air outlet surfaces 30 of the spray device 3, so that each processing window 20 matches each air outlet surface 30 of the spray device 3.

[0071] In a variant embodiment, reference Figure 3 , a wafer box 2 with two adjacent processing windows 20 is tiltedly placed on a tray 52 through a tilting structure, and the diagonal of the wafer box 2 is parallel to the central axis of the tray 52, so that the two processing windows 20 of the wafer box 2 are both facing upward and matched with the spray plate 31 of the spray device 3 and / or the spray pipes 32 in the middle and at both ends of the spray device 3, and the uniformity of the two cut surfaces 10 of the battery cell 1 is controlled by adjusting the gas outlet volume of the gas outlet surface 30 of the spray device 3 on both sides of the diagonal of the wafer box 2.

[0072] In this embodiment, by changing the tilt angle of the sheet box 2, the two processing windows 20 at the top of the sheet box 2 correspond to the gas outlet surface 30 of the top spray plate 31, and the two gas outlet surfaces 30 of the spray plate 31 can simultaneously coat the two processing windows 20 during the rotation of the sheet box 2, or each processing window 20 at the top of the sheet box 2 is matched with the two gas outlet surfaces 30 of the top spray plate 31 and one gas outlet surface 30 of the spray pipe 32 on both sides of the diagonal of the sheet box 2. Specifically, the tilt of the sheet box 2 is to tilt the frame 221 of the sheet box 2 through the tilting structure to tilt the battery cell 1, but the base 21 connecting the sheet box 2 and the tray 52 is still horizontal. Preferably, the battery cell 1 is square, and the battery cell 1 has two adjacent cutting surfaces 10. The bottom of the sheet box 2 is tilted upward by 45 degrees, so that the diagonal of the sheet box 2 is parallel to the central axis of the tray 52. ​​At this time, by controlling the gas outlet volume of the two gas outlet surfaces 30 of the spray plate 31 to be equal, the coating can be evenly formed on the two cutting surfaces 10 of the battery cell 1. When the cell 1 is not square, for example, a rectangle, the projection sizes of the two processing windows 20 on the spray plate 31 are different. At this time, the spray pipe 32 is needed to adjust the gas outlet on both sides of the diagonal of the sheet box 2 so that the two cutting surfaces 10 can be evenly coated, that is, the gas outlet of the two gas outlet surfaces 30 of the spray plate 31 is controlled to be the same, and the gas outlet surface 30 of the spray plate 31 on one side is supplemented by the gas outlet surface 30 of the spray pipe 32. In this embodiment, the spray plate 31 is used in combination with the spray pipe 32, that is, the gas outlet surface 30 of the spray plate 31 and the gas outlet surface 30 of the spray pipe 32 are used together to coat a processing window 20 of the sheet box 2 that is tilted, and the cutting surface 10 that is tilted and needs to be reinforced is supplemented to strengthen the coating effect, thereby improving the overall coating rate. At this time, each processing window 20 of the sheet box 2 matches the multiple gas outlet surfaces 30 of the spray device 3.

[0073] Take the three-piece slice as an example, refer to Figure 6 and Figure 7 , the wafer box 2 with two relative processing windows 20 is horizontally placed on the tray 52, so that one processing window 20 of the wafer box 2 faces the central axis of the tray 52 and matches the spray pipe 32 in the middle of the spray device 3, and the other processing window 20 is away from the central axis of the tray 52 and matches the spray pipes 32 at both ends of the spray device 3. It is worth noting that the wafer box 2 is provided with processing windows 20 on opposite sides, and the processing windows 20 at both ends of the wafer box 2 are respectively matched with the spray pipes 32 at both ends of the spray device 3. At this time, the blocking member 223 is required to block the battery cell 1 to prevent it from falling when the tray 52 rotates.

[0074] Take six shards as an example, refer to Figure 8, place the film box 2 with three adjacent processing windows 20 horizontally on the tray 52, so that one processing window 20 of the film box 2 faces the central axis of the tray 52 and matches the spray pipe 32 in the middle of the spray device 3, one processing window 20 faces upward and matches the spray plate 31 of the spray device 3, and the other processing window 20 is away from the central axis of the tray 52 and matches the spray pipes 32 at both ends of the spray device 3.

[0075] S104: introducing reactants and carrier gas into the gas outlet surface 30 of the spray device 3 that matches the processing window 20 through the gas path system, so that a repair film is formed on all the cut surfaces 10 of the battery cell 1.

[0076] Specifically, the reactants are preferably TMAl (trimethylaluminum) and H2O, but are not limited thereto. Depending on the specific coating, other suitable reactants may also be used, such as triethylaluminum, ethylaluminum dichloride, diethylaluminum monochloride and other aluminum-containing metal organics, O3, H2O2 and other O-containing gaseous substances after plasma ionization. TMAl and H2O flow into the source bottle through the liquid supply system, and then an inert gas such as N2 or Ar is used as a carrier gas. After the carrier gas is passed into the source bottle, TMAl and H2O will be carried out according to the saturated vapor pressure and the principle of the bubble method, and enter the reaction chamber 5. When TMAl and H2O are used as reactants and N2 is used as a carrier gas, the film formed is AlOx, but is not limited to AlOx, and may also be other suitable substances such as poly-Si, SiOx, SiNx, etc.

[0077] In the variant embodiment, similar to the above embodiment, the difference is that during the Al2O3 layer deposition process, the first reaction gas and the second reaction gas alternately enter the reaction space through the gas distribution device, so as to perform atomic layer deposition on a quarter of the cell 1. Specifically, the first reaction gas in the atomic layer deposition process flows into the reaction space in the reaction chamber through the spray device 3, so as to form a first reaction gas atomic film on the surface of the cell 1 to be processed; then the first reaction gas is extracted from the reaction space, and the second reaction gas in the atomic layer deposition process flows into the first reaction gas atomic film on the side section of the reaction space in the reaction chamber through the spray device 3 to react and form a material layer; then, the second reaction gas is extracted and the first reaction gas is introduced, and the cycle is repeated until the atomic layer deposition process is completed. Preferably, in order to ensure that the first reaction gas can fully adhere to the side section of the cell 1, and at the same time, in order to make the second reaction gas fully react with the first reaction gas, the time for introducing the first reaction gas into the reaction space should be greater than or equal to 0.1s, and the time for introducing the second reaction gas into the reaction space should also be greater than or equal to 0.1s. Preferably, between the introduction of the first reaction gas and the introduction of the second reaction gas and between the introduction of the second reaction gas and the introduction of the first reaction gas, a third gas that does not react with the first reaction gas and the second reaction gas may be introduced. The third gas can purge the residual gas in the reaction space, thereby ensuring that the reaction between the first and second reaction gases only occurs on the side section of one quarter of the battery cell 1; further preferably, in order to ensure the purging effect of the third gas, the time for introducing the third gas should also be greater than or equal to 0.1s. Specifically, when the Al2O3 layer is deposited by an atomic layer deposition process, the first reaction gas is a mixture of TMAl or TEAl and hydrogen or nitrogen or argon; the second reaction gas is at least one of water vapor, ozone and ammonia, or a mixed gas of at least one of water vapor, ozone and ammonia and at least one of nitrogen or argon or hydrogen; the third gas is at least one of nitrogen, hydrogen or an inert gas.

[0078] Furthermore, after the coating is completed, an annealing step is required to perform an annealing process. Preferably, an oxygen-free cooling step is required to cool the coated cell 1 to room temperature in an oxygen-free environment.

[0079] It should be noted that the above embodiments can be freely combined as needed. The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A battery cell coating device, It is characterized in that include: A reaction chamber, wherein a heater and a tray are arranged in the reaction chamber; A rotating device, the rotating device is suitable for driving the tray in the reaction chamber to rotate; A cell box, the cell box comprising a base and a box body, the base being suitable for being mounted on the tray, the box body being arranged above the base, the cell having at least two cutting surfaces being suitable for being placed in the box body, and a processing window being arranged on the side wall of the box body for communicating with the outside world with the cutting surfaces; A spray device, the spray device comprising a spray plate and a spray pipe spaced apart at the bottom of the spray plate, the spray pipe being detachably mounted at the bottom of the spray plate, and both the spray plate and the spray pipe being provided with an air outlet surface; A gas circuit system, the gas circuit system is connected to the spray device and is suitable for introducing reactants and carrier gas into the spray device; A gas extraction device is used to exhaust the gas in the reaction chamber.

2. A cell coating device according to claim 1, It is characterized in that The spray device is any one of E type, F type, T type and C type; the spray plate is arranged above the tray and symmetrically arranged relative to the central axis of the tray; the bottom of the spray plate is provided with an air outlet surface on both sides of the central axis of the tray; the spray pipe is arranged in the middle or at both ends of the bottom of the spray plate, and the spray pipe is provided with an air outlet surface on the side facing the film box.

3. A cell coating device according to claim 2, It is characterized in that A plurality of mounting threaded holes are provided at intervals at the bottom of the spray plate, and mounting threads are provided at the top of the spray pipe. The spray pipe can be detachably mounted in the mounting threaded holes at the bottom of the spray plate through the mounting threads; The distance between the shower plate and the processing window of the film box facing the shower plate is 1 cm; The distance between the spray pipe and the processing window of the film box facing away from the central axis of the tray is 6-10 cm.

4. The cell coating device according to claim 1, It is characterized in that It also includes a tilting structure, through which the box body is arranged above the base, and the tilting structure can adjust the tilting angle of the box body so that the two processing windows of the box body are suitable for matching with the spray device.

5. A cell coating device according to claim 4, It is characterized in that The tilting structure includes a rotating shaft and a lifting member. One end of the bottom of the box body can be rotatably mounted on the base via the rotating shaft, and the other end is connected to the base via the lifting member. The lifting member can drive the other end of the bottom of the box body to move upward, so that the diagonal of the box body is arranged parallel to the central axis of the tray.

6. The cell coating device according to claim 1, It is characterized in that The box body includes a frame body and side panels, the frame body includes a bottom plate, a front plate and a rear plate, the front plate and the rear plate are arranged above the bottom plate and relatively located on two opposite sides of the bottom plate, and the side panels are detachably mounted on other sides of the bottom plate; And / or, a blocking member is further provided at the processing window of the box body, and the blocking member is suitable for abutting against the cut surface of the battery cell.

7. A method for repairing the coating on the cut surface of a battery cell, It is characterized in that include: Obtaining a cut battery cell, wherein the battery cell has at least two cut surfaces; Stacking a plurality of the battery cells into a cell box, wherein the cell box has at least two processing windows matching the cutting surfaces, so that all the cutting surfaces of the battery cells are connected to the outside through the processing windows; Placing the wafer box on a tray in a reaction chamber so that each processing window of the wafer box matches the gas outlet surface of a spray plate on a spray device and / or the gas outlet surface of a spray pipe; Reactants and carrier gas are introduced into the gas outlet surface of the spray device that matches the processing window through the gas path system, so that a repair film is formed on all cut surfaces of the battery cell.

8. A method for repairing the coating of a cut surface of a cell according to claim 7, It is characterized in that Placing the wafer box on a tray in the reaction chamber so that each processing window of the wafer box matches the gas outlet surface of the spray plate and / or the gas outlet surface of the spray pipe of the spray device, specifically comprising: The film box with two adjacent processing windows is horizontally placed on the tray, with one processing window of the film box facing upward and matching the spray plate at the top of the spray device, and the other processing window facing away from the central axis of the tray and matching the spray pipes in the middle or at both ends of the spray device; Alternatively, the wafer box having two adjacent processing windows is tiltedly placed on the tray via a tilting structure so that the diagonal of the wafer box is parallel to the central axis of the tray, and the two processing windows of the wafer box are both facing upward and matched with the spray plate of the spray device and / or the spray pipes in the middle and at both ends of the spray device, and the uniformity of the two cutting surfaces of the battery cell is controlled by adjusting the air output of the spray device on both sides of the diagonal of the wafer box.

9. A method for repairing the coating of a cut surface of a cell according to claim 7, It is characterized in that Placing the wafer box on a tray in the reaction chamber so that each of the processing windows of the wafer box matches the gas outlet surface of the spray plate and / or the gas outlet surface of the spray pipe of the spray device, specifically comprising: horizontally placing the wafer box having two relative processing windows on the tray so that one of the processing windows of the wafer box faces the central axis of the tray and matches the spray pipe in the middle of the spray device, and the other processing window is away from the central axis of the tray and matches the spray pipes at both ends of the spray device.

10. A method for repairing the coating film on the cut surface of a battery cell according to claim 7, It is characterized in that The wafer box is placed on a tray in the reaction chamber so that each processing window of the wafer box matches the gas outlet surface of the spray plate and / or the gas outlet surface of the spray pipe of the spray device, specifically comprising: horizontally placing the wafer box with three adjacent processing windows on the tray so that one processing window of the wafer box faces the central axis of the tray and matches the spray pipe in the middle of the spray device, one processing window faces upward and matches the spray plate of the spray device, and the other processing window is away from the central axis of the tray and matches the spray pipes at both ends of the spray device.

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