Passivation structure and passivation equipment

Abstract

The utility model provides a passivation structure and passivation equipment, wherein the passivation structure comprises a boat frame main body, and a loading space is formed in the boat frame main body; the plurality of battery piece boxes are placed in the loading space, the battery piece boxes are electrically conducted with the boat rack main body, and battery pieces in the battery piece boxes are provided with at least one to-be-coated surface; the at least one first electrode plate is arranged on the boat rack main body and is electrically insulated from the boat rack main body, and the first electrode plate corresponds to the to-be-coated surfaces of the battery pieces in the plurality of battery piece boxes; wherein the boat rack main body and the battery piece box are located at the same potential, and the potential is opposite to that of the first electrode plate; the passivation structure provided by the utility model is higher in coating efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of coating technology, and more specifically, it relates to a passivation structure and passivation equipment. Background Technology

[0002] With the development of the photovoltaic industry and the continuous upgrading of crystalline silicon cell technology, laser dicing technology is used in the cell module production process to divide a whole cell into two or more smaller pieces. This reduces the string current in the cell module and thus reduces power loss due to lower series resistance, making it one of the important and effective ways to improve the power of photovoltaic modules.

[0003] However, laser dicing also impacts the cell conversion efficiency. Carrier recombination is more pronounced on the newly cut surface (i.e., the unpassivated surface) of the cell, and edge recombination has a more significant impact on conversion efficiency for high-efficiency cells. To eliminate or reduce the cell conversion efficiency loss caused by laser non-destructive dicing (TLS), a passivation coating process can be applied to the edges of the newly formed diced surface, effectively reducing or eliminating the conversion efficiency loss caused by dicing.

[0004] Currently, after multiple laser non-destructive cutting processes, the solar cells have multifaceted new cross-sectional edges, resulting in low passivation coating efficiency at the cell edges, which seriously affects the cell's conversion efficiency. Utility Model Content

[0005] The purpose of this invention is to provide a passivation structure and passivation equipment to solve the problem in the prior art that the edge passivation coating efficiency after multiple cutting of battery cells is too low, which seriously affects the conversion efficiency of battery cells.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] This utility model proposes a passivation structure, including:

[0008] The main body of the boat frame, with a loading space inside;

[0009] Multiple cell boxes are placed in the loading space. The cell boxes are electrically connected to the main body of the boat frame. Each cell in the cell box has at least one surface to be coated.

[0010] At least one first electrode plate, the first electrode plate corresponding to the coating surface of the battery cells in the plurality of battery cell boxes;

[0011] The main body of the boat frame and the battery cell box are at the same potential and opposite to the potential of the first electrode plate.

[0012] Furthermore, it also includes at least one second electrode plate, which corresponds one-to-one with the first electrode plate and is isolated from each other. The second electrode plate is electrically connected to the main body of the boat frame, and the second electrode plate has multiple drainage holes corresponding to multiple battery cell boxes.

[0013] Furthermore, the distance between the first electrode plate and the corresponding second electrode plate is 10-50mm, and the distance between the second electrode plate and the corresponding surface to be coated is 10-50mm.

[0014] Furthermore, the number of the first electrode plate and the second electrode plate is set to one, and the first electrode plate and the second electrode plate are fixedly connected by multiple insulating fasteners.

[0015] Furthermore, the main body of the boat frame includes a pair of side plates and a pair of supports that together enclose a loading space. One of the supports is provided with multiple insulating supports for supporting the first electrode plate, and the other support is provided with multiple conductive supports for supporting the second electrode plate.

[0016] Furthermore, a pair of side plates are provided with multiple positioning slots for securing multiple battery cell boxes.

[0017] Furthermore, a gripping and positioning component is provided on the first electrode plate or the second electrode plate. The gripping and positioning component includes multiple crossbeams spaced apart on the first electrode plate and multiple gripping blocks spaced apart between the multiple crossbeams.

[0018] Furthermore, the first electrode plate includes a first upper electrode plate and a first lower electrode plate located on the upper and lower sides of the boat frame body, and the second electrode plate includes a second upper electrode plate and a second lower electrode plate located on the upper and lower sides of the boat frame body. The first upper electrode plate and the second upper electrode plate are fixedly connected by a plurality of insulating fasteners, and the second lower electrode plate and the second lower electrode plate are fixedly connected by a plurality of insulating fasteners.

[0019] Furthermore, the main body of the boat frame is a one-piece molded load-bearing frame, with the first upper electrode plate and the second upper electrode plate located at the top of the load-bearing frame, and the first lower electrode plate and the second lower electrode plate located at the bottom of the load-bearing frame.

[0020] This invention also proposes a passivation device, including the passivation structure as described above, and a reaction furnace in which the passivation structure is placed.

[0021] Compared with the prior art, the beneficial effects of the passivation structure and passivation equipment provided by this utility model are as follows:

[0022] 1. The passivation structure is provided with a boat frame body to accommodate multiple cell boxes. The cell boxes are electrically connected to the boat frame body, so that the boat frame body and the cell boxes are at the same potential, which is opposite to the potential of the first electrode plate. This design generates an alternating electric field between the first electrode plate and the surface of the cell to be coated in the cell box. The process gas in between generates plasma to passivate the surface of the cell to be coated, thereby achieving higher coating efficiency.

[0023] 2. After the solar cell has been laser-cut two or more times, the edges of the solar cell can be passivated on multiple sides. By simultaneously passivating multiple sides of the solar cell, time can be saved and the equipment utilization rate can be improved.

[0024] 3. Adding a second electrode plate with a potential opposite to that of the first electrode plate enables single-sided or multi-sided superimposed coating passivation of the battery cell, which accelerates the coating speed of the passivation structure on the battery cell, improves the coating efficiency of the passivation structure, and facilitates the realization of mass edge passivation coating of battery cells. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a side view of the passivation structure in the first embodiment;

[0027] Figure 2 This is a schematic diagram of the structure after the first electrode plate and the second electrode plate are assembled in the first embodiment;

[0028] Figure 3 This is a schematic diagram of the main structure of the boat frame in the first embodiment;

[0029] Figure 4 This is a side view of the passivation structure in the second embodiment;

[0030] Figure 5 This is a three-dimensional structural diagram of the passivation structure in the second embodiment;

[0031] Figure 6 This is a simplified schematic diagram of the passivation structure in the third embodiment;

[0032] Figure 7 This is a schematic diagram showing the positions of the two first electrode plates and the cell box in the third embodiment. Figure 1 ;

[0033] Figure 8This is a schematic diagram showing the positions of the two first electrode plates and the cell box in the third embodiment. Figure 2 ;

[0034] The main labels for the various figures in the diagram are as follows:

[0035] 3. Cell box; 5. Boat frame body; 6. First electrode plate; 7. Second electrode plate; 61. First upper electrode plate; 62. First lower electrode plate; 63. First left electrode plate; 64. First right electrode plate; 71. Second upper electrode plate; 72. Second lower electrode plate; 10. Second electrical connector; 11. Conductive strip; 12. Rear side plate; 13. Front side plate; 14. Left bracket; 15. Right bracket; 16. Insulating support; 17. Conductive support; 18. First electrical connector; 19. Conductive connector; 20. Insulating connector; 21. Insulating fastener; 22. First gripper; 23. Second gripper; 24. Crossbeam; 26. Positioning slot assembly. Detailed Implementation

[0036] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0037] Currently, existing large-scale passivation equipment only targets the edges of a single-cut solar cell. For cells that have been cut twice or more, it cannot simultaneously passivate multiple edges of the middle cell (where multiple sides of the cell have new cut edges due to laser cutting). For example, after a cell is cut twice, two sides of the middle cell require passivation; after a cell has undergone four cuts in the top, bottom, left, and right directions, four sides require passivation. Existing passivation equipment is inefficient when coating cut solar cells, unable to quickly achieve large-scale edge passivation coating of solar cells. Furthermore, the passivation equipment can only perform edge passivation coating on one side of the solar cell, and cannot simultaneously perform edge passivation coating on solar cells that have undergone multiple cuts and require passivation on multiple sides.

[0038] In response, this utility model proposes a new passivation structure and passivation equipment, which can quickly achieve mass edge passivation coating of battery cells, and can also achieve effective and controllable target film coating passivation of the multi-sided edges of battery cells.

[0039] Please refer to sections 1 to 2. Figure 8 The passivation structure proposed in this utility model includes at least the following:

[0040] The main body of the boat frame 5 has a loading space inside.

[0041] Multiple cell boxes 3 are placed in the loading space. The cell boxes 3 are electrically connected to the boat frame body 5. Each cell in the cell box 3 has at least one surface to be coated.

[0042] At least one first electrode plate 6, the first electrode plate 6 corresponding to the coating surface of the battery cells in the plurality of battery cell boxes 3;

[0043] The boat frame body 5 and the battery cell box 3 are at the same potential, but opposite to the potential of the first electrode plate 6.

[0044] It should be understood that if the boat frame body 5 and the battery cell box 3 have a positive potential, then the first electrode plate 6 has a negative potential; conversely, if the boat frame body 5 and the battery cell box 3 have a negative potential, then the first electrode plate 6 has a positive potential.

[0045] This invention addresses the passivation structure for solar cells after one or more laser dicing processes, where the solar cell has at least one surface to be coated. The passivation structure includes at least one first electrode plate 6. A boat frame body 5 is provided to accommodate multiple solar cell boxes 3. The solar cell boxes 3 are electrically connected to the boat frame body 5, placing them at the same potential, opposite to the potential of the first electrode plate 6. This design generates an alternating electric field between the first electrode plate 6 and the surface to be coated of the solar cells in the solar cell boxes 3. The process gas in this field generates plasma to passivate the surface to be coated, thus achieving passivation coating on the N-sided (N≥1) diced surface of the solar cell. Compared to related technologies that generate plasma between positive and negative electrode plates located on opposite sides of the solar cell box 3, this invention generates plasma between one electrode plate 6 and the surface to be coated of the solar cells in the solar cell box 3, resulting in higher coating efficiency.

[0046] Furthermore, the passivation structure proposed in this utility model also includes at least one second electrode plate 7, which corresponds one-to-one with the first electrode plate 6 and is isolated from each other. The second electrode plate 7 is electrically connected to the boat frame body 5, and the second electrode plate 7 has multiple drainage holes corresponding to multiple battery cell boxes 3.

[0047] This utility model employs a passivation structure comprising at least one second electrode plate 7. The potential of the second electrode plate 7 is opposite to that of the first electrode plate 6, thereby generating an alternating electric field between the first electrode plate 6 and the surface of the battery cell to be coated in the battery cell cassette 3, and between the second electrode plate 7 and the surface of the battery cell to be coated in the battery cell cassette 3. During this process, the process gas generates superimposed plasma. Simultaneously, the drainage holes of the second electrode plate 7 guide the plasma between the first electrode plate 6 and the second electrode plate 7 to be deposited onto the surface of the battery cell to be coated in the battery cell cassette 3, achieving superimposed coating passivation of the battery cell. This accelerates the coating speed of the passivation structure on the N-side (N≥1) cut surface of the battery cell, further improving the coating efficiency of the passivation structure.

[0048] It should be noted that the passivation structure proposed in this utility model includes at least one first electrode plate 6, and may also include at least one second electrode plate 7. For ease of understanding, three embodiments of the passivation structure based on different numbers of first electrode plates 6 and / or second electrode plates 7 are listed below.

[0049] In the first embodiment, as Figures 2 to 4 As shown, the passivation structure includes a first electrode plate 6, a second electrode plate 7, a boat frame body 5, and multiple cell boxes 3. At this time, the cell in the cell box 3 has one surface to be coated, and the passivation structure only performs coating passivation on one side of the cell.

[0050] The first electrode plate 6 and the second electrode plate 7 are isolated from each other. The first electrode plate 6 and the second electrode plate 7 can be set to be parallel or approximately parallel. The first electrode plate 6 and the second electrode plate 7 are fixedly connected by multiple insulating fasteners 21.

[0051] It should be understood that the insulating fastener 21 not only serves to fix the first electrode plate 6 and the second electrode plate 7 together, but also serves to isolate the first electrode plate 6 and the second electrode plate 7. The insulating fastener 21 has an insulating material, such as a ceramic spacer or quartz, to isolate the first electrode plate 6 and the second electrode plate 7.

[0052] A gripping and positioning assembly is provided on the side of the first electrode plate 6 facing away from the second electrode plate 7. The gripping and positioning assembly includes a pair of crossbeams 24 spaced apart on the first electrode plate 6 and a plurality of gripping blocks respectively connected to the pair of crossbeams 24.

[0053] It should be understood that the number of gripping blocks can be set to, but is not limited to, two. The first gripping block 22 and the second gripping block 23 are respectively set on the first electrode plate 6 near its two ends. By setting the crossbeam 24 and the gripping blocks, it is convenient for the robot arm to position and grasp. During automated loading and unloading of passivation cassettes, the first electrode plate 6 and the second electrode plate 7 as a whole can be grasped and placed on the boat frame body 5 by the robot arm.

[0054] Of course, in other alternative embodiments, the second electrode plate 7 may be provided with a gripping and positioning component, and the specific number of the crossbeam 24 and gripping blocks in the gripping and positioning component is not limited here.

[0055] The first electrode plate 6 is provided with a first power connector 18, and the second electrode plate 7 has multiple drainage holes corresponding to multiple battery cell boxes 3. The shape of the drainage holes is preferably square, but the shape of the drainage holes can also be elliptical, rhomboid, or irregular, etc. At the same time, the size of the drainage holes is greater than or equal to the overall length and width of the surface to be coated of all the battery cells in the battery cell box 3.

[0056] The first electrode plate 6 is provided with a plurality of insulating connectors 20, and the second electrode plate 7 is provided with a plurality of conductive connectors 19.

[0057] The main body 5 of the boat frame includes a pair of side plates and a pair of supports that together enclose the loading space. The pair of side plates includes a front side plate 13 and a rear side plate 12 arranged symmetrically, and the pair of supports includes a left support 14 and a right support 15 arranged symmetrically.

[0058] The main body 5 of the boat frame is located in the loading space and is equipped with a conductive strip 11, which is connected to a pair of supports (i.e., the left support 14 and the right support 15).

[0059] It should be understood that the conductive strip 11 is made of a material with good electrical conductivity. By laying the conductive strip 11 at the bottom of the boat frame body 5, the electrical conductivity of the entire boat frame body 5 can be enhanced.

[0060] One of the brackets (i.e., the left bracket 14) is provided with a first electrical connector 18 and a plurality of insulating supports 16 for supporting the first electrode plate 6, and the other bracket (i.e., the right bracket 15) is provided with a plurality of conductive supports 17 for supporting the second electrode plate 7.

[0061] It should be understood that the multiple insulating support members 16 of the boat frame body 5 correspond one-to-one with and are snap-fitted into the multiple insulating connectors 20 of the first electrode plate 6. The multiple conductive support members 17 of the boat frame body 5 correspond one-to-one with and are snap-fitted into the multiple conductive support members 17 of the first electrode plate 6. The insulating connectors 20 and insulating support members 16 are made of insulating material. Through the snap-fitting between the insulating connectors 20 and insulating support members 16, the first electrode plate 6 and the boat frame body 5 achieve a positioning support connection and electrical insulation. The conductive connectors 19 and conductive support members 17 are made of conductive material. Through the snap-fitting between the conductive connectors 19 and conductive support members 17, the second electrode plate 7 and the boat frame body 5 achieve a positioning support connection and electrical conduction.

[0062] Multiple battery cell boxes 3 are placed horizontally at intervals within the loading space of the boat frame body 5. Meanwhile, a pair of side plates of the boat frame body 5 are provided with multiple positioning slots 26 for securing the multiple battery cell boxes 3.

[0063] It should be understood that each positioning slot group 26 can consist of four positioning slots, with two positioning slots located on one side plate (i.e., the front side plate 13) and the other two positioning slots 26 located on the other side plate (i.e., the rear side plate 12). The cell box 3 itself is provided with four electrode rods, which are evenly installed on both sides of the box. At this time, the four electrode rods in the cell box 3 are engaged in the four positioning slots in the boat frame body 5, and these four positioning slots form a positioning slot group 26. At the same time, the cell box 3 and the second boat frame are electrically connected, so that the cell box 3 and the boat frame body 5 are at the same potential.

[0064] In practical applications, after the passivation structure is inserted into the coating reaction chamber and placed in place, the first electrical connector 18 in the passivation structure engages with the third electrical connector in the coating reaction chamber to achieve direct electrical connection between the first electrode plate 6 in the passivation structure and the third electrical connector in the coating reaction chamber. The second electrical connector 10 in the passivation structure engages with the fourth electrical connector in the coating reaction chamber to achieve indirect electrical connection between the second electrode plate 7 in the passivation structure and the fourth electrical connector in the coating reaction chamber. Furthermore, the cell box 3, the boat frame body 5, and the second electrode plate 7 are at the same potential. Since the potentials of the third and fourth electrical connectors are opposite, the potentials of the first electrode plate 6 and the second electrode plate 7 are also opposite. In this configuration, the first electrical connector 18 and the second electrical connector 10 can be used as connector bases, while the third and fourth electrical connectors can be used as connector rods; alternatively, the first electrical connector 18 and the second electrical connector 10 can be used as connector rods, while the third and fourth electrical connectors can be used as connector bases. Then, a coating passivation process is performed on the newly formed cross-section edge of the battery cell, during which process gas is introduced into the coating reaction chamber.

[0065] In the passivation structure of the first embodiment, a first electrode plate 6 and a second electrode plate 7 with opposite potentials are provided, so that an alternating electric field is generated between the first electrode plate 6 and the second electrode plate 7, and between the first electrode plate 6 and the surface of the battery cell to be coated in the battery cell box 3. During this process, the process gas generates superimposed plasma. At the same time, the drainage hole of the second electrode plate 7 guides the plasma between the first electrode plate 6 and the second electrode plate 7 to be deposited on the surface of the battery cell to be coated in the battery cell box 3, thereby realizing superimposed coating passivation on one side of the battery cell. This accelerates the coating speed of the passivation structure on one side of the battery cell, improves the coating efficiency of the passivation structure, and is conducive to realizing mass edge passivation coating of the battery cell.

[0066] Furthermore, the distance between the first electrode plate 6 and the second electrode plate 7 can be set to 10-50 mm, and the distance between the second electrode plate 7 and the surface of the battery cell in the cell holder 3 to be coated can also be set to 10-50 mm. In practical applications, when the distance between the first electrode plate 6 and the second electrode plate 7 is 20 mm, and the distance between the second electrode plate 7 and the surface of the battery cell in the cell holder 3 to be coated is 20 mm, the coating efficiency of this passivation structure is better.

[0067] In the second embodiment, as Figure 4 , Figure 5 As shown, the passivation structure includes a first electrode plate 6, a second electrode plate 7, a boat frame body 5, and multiple cell boxes 3. At this time, the cell in the cell box 3 has two surfaces to be coated, namely the first surface to be coated and the second surface to be coated located on the upper and lower sides of the cell. This passivation structure performs coating passivation on both sides of the cell.

[0068] The first electrode plate 6 includes a first upper electrode plate 61 and a first lower electrode plate 62 located on the upper and lower sides of the boat frame body 5, and the second electrode plate 7 includes a second upper electrode plate 71 and a second lower electrode plate 72 located on the upper and lower sides of the boat frame body 5.

[0069] The first upper electrode plate 61 and the second upper electrode plate 71 are isolated from each other. The first upper electrode plate 61 and the second upper electrode plate 71 can be set to be parallel or approximately parallel. The first upper electrode plate 61 and the second upper electrode plate 71 are fixedly connected by a plurality of insulating fasteners 21. The first lower electrode plate 62 and the second lower electrode plate 72 can also be isolated from each other. The first lower electrode plate 62 and the second lower electrode plate 72 can be set to be parallel or approximately parallel. The first lower electrode plate 62 and the second lower electrode plate 72 are fixedly connected by a plurality of insulating fasteners 21.

[0070] It should be understood that the insulating fastener 21 has an insulating material, such as a ceramic spacer or quartz. The insulating fastener 21 not only serves to fix the first upper electrode plate 61 and the second upper electrode plate 71 together, and the first lower electrode plate 62 and the second lower electrode plate 72 together, but also serves to isolate the first upper electrode plate 61 and the second upper electrode plate 71, and the first lower electrode plate 62 and the second lower electrode plate 72.

[0071] The first upper electrode plate 61 and the first lower electrode plate 62 are provided with first electrical connectors 18. The first lower electrode plate 71 and the second lower electrode plate 72 have multiple drainage holes corresponding to the multiple battery cell boxes 3. The shape of the drainage holes is preferably square. Of course, the shape of the drainage holes can also be elliptical, rhomboid, or irregular, etc. At the same time, the size of the drainage holes is greater than or equal to the overall length and width of the surface of all battery cells to be coated in the battery cell box 3.

[0072] The main body 5 of the boat frame is a one-piece molded load-bearing frame, and the interior of the load-bearing frame is hollow and can accommodate multiple battery cell boxes 3. A second power connection connector 10 is provided on the side of the load-bearing frame.

[0073] The first upper electrode plate 61 and the second upper electrode plate 71 are arranged in parallel on the top of the support frame. At the same time, the first upper electrode plate 61 or the support frame is provided with an insulating component to ensure that the first upper electrode plate 61 is electrically insulated from the support frame. Meanwhile, the second upper electrode plate 71 or the support frame is provided with a conductive component to ensure that the second upper electrode plate 71 is electrically connected to the support frame.

[0074] The first lower electrode plate 62 and the second lower electrode plate 72 are arranged parallel to each other at the bottom of the support frame. At the same time, the first lower electrode plate 62 or the support frame is provided with an insulating component to ensure that the first lower electrode plate 62 is electrically insulated from the support frame. Meanwhile, the second lower electrode plate 72 or the support frame is provided with a conductive component to ensure that the second lower electrode plate 72 is electrically connected to the support frame.

[0075] In practical applications, after the passivation structure is inserted into the coating reaction chamber and placed in place, the first electrical connectors 18 on the first upper electrode plate 61 and the first lower electrode plate 62 of the passivation structure are respectively connected to the two third electrical connectors in the coating reaction chamber for electrical conduction. This achieves direct electrical conduction between the first upper electrode plate 61 and the first lower electrode plate 62 of the passivation structure and the third electrical connectors in the coating reaction chamber. The second electrical connector 10 on the boat frame body 5 of the passivation structure is connected to the fourth electrical connector in the coating reaction chamber for electrical conduction. This achieves indirect electrical conduction between the second upper electrode plate 71 and the second lower electrode plate 72 of the passivation structure and the fourth electrical connector in the coating reaction chamber. Furthermore, the cell box 3, the boat frame body 5, and the second electrode plate 7 composed of the second upper electrode plate 71 and the second lower electrode plate 72 are at the same potential. Since the potentials of the third and fourth electrical connectors are opposite, the potentials of the first upper electrode plate 61 and the second upper electrode plate 71 are also opposite, as are the potentials of the first lower electrode plate 62 and the second lower electrode plate 72. Alternatively, the first and second electrical connectors 18 and 10 can be connector sockets, while the third and fourth electrical connectors can be connector rods; or the first and second electrical connectors 18 and 10 can be connector rods, while the third and fourth electrical connectors can be connector sockets. Then, a coating passivation process is performed on the newly formed cross-section edge of the battery cell, during which process gas is introduced into the coating reaction chamber.

[0076] For the passivation structure in the second embodiment, a first upper electrode plate 61 and a second upper electrode plate 71 with opposite potentials are provided, as well as a first lower electrode plate 62 and a second lower electrode plate 72 with opposite potentials. This creates an alternating electric field between the first upper electrode plate 61 and the second upper electrode plate 71, and between the first upper electrode plate 61 and the first surface of the battery cell in the cell cassette 3 to be coated. During this process, the process gas generates superimposed plasma, which is then channeled through the drainage holes of the second upper electrode plate 71 and deposited onto the first surface of the battery cell in the cell cassette 3 to be coated. Simultaneously, the first lower electrode plate 62 and the second lower electrode plate 72... An alternating electric field is generated between the first lower electrode plate 62 and the second coating surface of the battery cell in the battery cell box 3. During this process, the process gas generates superimposed plasma. The plasma between the first lower electrode plate 62 and the second lower electrode plate 72 is guided through the drainage hole of the second lower electrode plate 72 and deposited on the second coating surface of the battery cell in the battery cell box 3. This achieves superimposed coating passivation of the cut surfaces on both sides of the battery cell, accelerates the coating speed of the first coating surface and the second coating surface of the battery cell that are at the same potential as the second upper electrode plate 71 and the second lower electrode plate 72, improves the coating efficiency of the passivation structure, and facilitates the realization of mass edge passivation coating of the battery cell.

[0077] Furthermore, the distance between the first upper electrode plate 61 and the second upper electrode plate 71 can be set to 10-50 mm, and the distance between the second upper electrode plate 71 and the first surface of the battery cell in the cell holder 3 to be coated can be set to 10-50 mm. Similarly, the distance between the first lower electrode plate 62 and the second lower electrode plate 72 can be set to 10-50 mm, and the distance between the second lower electrode plate 72 and the second surface of the battery cell in the cell holder 3 to be coated can be set to 10-50 mm. In practical applications, when the distance between the first upper electrode plate 61 and the second upper electrode plate 71 is 20 mm, and the distance between the first surface of the battery cell in the cell holder 3 to be coated and the second upper electrode plate 71 is 20 mm, and / or when the distance between the first lower electrode plate 62 and the second lower electrode plate 72 is 20 mm, and the distance between the second lower electrode plate 72 and the second surface of the battery cell in the cell holder 3 to be coated is 20 mm, the coating efficiency of this passivation structure is better.

[0078] In the third embodiment, as Figure 6 , Figure 7 , Figure 8 As shown, the passivation structure includes two first electrode plates 6, a boat frame body 5, and multiple cell boxes 3. At this time, the cell in the cell box 3 has two surfaces to be coated, namely the first surface to be coated and the second surface to be coated located on the upper and lower sides of the cell. This passivation structure performs coating passivation on both sides of the cell.

[0079] Electrical connectors are provided on the two electrode plates and the main body 5 of the boat frame. A loading space is formed inside the main body 5, and multiple battery cell boxes 3 are placed horizontally at intervals in the loading space. The multiple battery cell boxes 3 are electrically connected to the main body 5 of the boat frame.

[0080] The first electrode plate 6 includes a first upper electrode plate 61 and a first lower electrode plate 62 located on the upper and lower sides of the boat frame body 5, respectively. The first upper electrode plate 61 and the first lower electrode plate 62 are made of graphite. The first upper electrode plate 61 and the first lower electrode plate 62 can be fixedly connected to the boat frame body 5 and electrically insulated from the boat frame body 5. Alternatively, the first upper electrode plate 61 and the first lower electrode plate 62 can be not fixedly connected to the boat frame body 5, and can be located on the upper and lower sides of the boat frame body 5 by other supporting components.

[0081] It should be understood that when a cell in the cell holder 3 has two surfaces to be coated, these surfaces can be a first surface to be coated and a second surface to be coated located on the top and bottom sides of the cell, or they can be a first surface to be coated and a second surface to be coated located on the left and right sides of the cell. In this case, the two first electrode plates 6 can include a first upper electrode plate 61 and a first lower electrode plate 62 placed vertically spaced apart, such that the first surface to be coated of the cell in the cell holder 3 corresponds to the first upper electrode plate 61, and the second surface to be coated of the cell in the cell holder 3 corresponds to the first lower electrode plate 62. Alternatively, the two first electrode plates 6 can include a first left electrode plate 63 and a first right electrode plate 64 placed horizontally spaced apart, such that the first surface to be coated of the cell in the cell holder 3 corresponds to the first left electrode plate 63, and the second surface to be coated of the cell in the cell holder 3 corresponds to the first right electrode plate 64.

[0082] In practical applications, after the passivation structure is placed into the coating reaction chamber, the two electrode plates are connected to the positive electrode in the coating reaction chamber, and the boat frame body 5 is connected to the negative electrode in the coating reaction chamber. At the same time, the boat frame body 5 and the cell box 3 are on the same electrode. Then, the edge of the newly formed cross-section of the cell is coated and passivated, during which process gas is introduced into the coating reaction chamber.

[0083] For the passivation structure in the third embodiment, two first electrode plates 6 are provided, such that an alternating electric field is generated between one of the first electrode plates 6 and the first surface of the battery cell in the battery cell box 3 to be coated, during which the process gas generates plasma. At the same time, an alternating electric field is generated between the other first electrode plate 6 and the second surface of the battery cell in the battery cell box 3 to be coated, during which the process gas generates plasma, thereby achieving simultaneous coating and passivation of the two surfaces of the battery cell to be coated.

[0084] This utility model also proposes a passivation device, including any of the passivation structures described above, and a reaction furnace in which the passivation structure is placed.

[0085] The passivation structure and passivation equipment proposed in this invention can efficiently and in large quantities deposit various passivation films on the N-side (N≥1) edge of the battery cell using ALD+PECVD process, realizing the industrialization of edge passivation coating for half or whole battery cells. This technology has the advantages of stable process, excellent passivation film, high coating efficiency, compatibility with many coating types, and low manufacturing cost.

[0086] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A passivated structure, characterized in that, include: The main body of the boat frame has a loading space inside. Multiple cell boxes are placed in the loading space. The cell boxes are electrically connected to the main body of the boat frame. Each cell in a cell box has at least one surface to be coated. At least one first electrode plate, the first electrode plate corresponding to the coating surface of the battery cell in the plurality of battery cell boxes; The boat frame body and the battery cell box are at the same potential, but opposite to the potential of the first electrode plate.

2. The passivation structure as described in claim 1, characterized in that, It also includes at least one second electrode plate, which corresponds one-to-one with the first electrode plate and is isolated from each other. The second electrode plate is electrically connected to the main body of the boat frame, and the second electrode plate has multiple drainage holes corresponding to the multiple battery cell boxes.

3. The passivation structure as described in claim 2, characterized in that, The distance between the first electrode plate and the corresponding second electrode plate is 10-50mm, and the distance between the second electrode plate and the corresponding surface to be coated is 10-50mm.

4. The passivation structure as described in claim 2, characterized in that, The number of the first electrode plate and the second electrode plate is set to one, and the first electrode plate and the second electrode plate are fixedly connected by multiple insulating fasteners.

5. The passivation structure as described in any one of claims 2 to 4, characterized in that, The main body of the boat frame includes a pair of side plates and a pair of supports that together form a loading space. One of the supports is provided with a plurality of insulating supports for supporting the first electrode plate, and the other support is provided with a plurality of conductive supports for supporting the second electrode plate.

6. The passivation structure as described in claim 5, characterized in that, The pair of side plates are provided with multiple positioning slots for securing the multiple battery cell boxes.

7. The passivation structure as described in claim 2, characterized in that, A gripping and positioning component is provided on the first electrode plate or the second electrode plate. The gripping and positioning component includes a plurality of crossbeams spaced apart on the first electrode plate or the second electrode plate, and a plurality of gripping blocks spaced apart between the plurality of crossbeams.

8. The passivation structure as described in claim 2, characterized in that, The first electrode plate includes a first upper electrode plate and a first lower electrode plate located on the upper and lower sides of the boat frame body. The second electrode plate includes a second upper electrode plate and a second lower electrode plate located on the upper and lower sides of the boat frame body. The first upper electrode plate and the second upper electrode plate are fixedly connected by a plurality of insulating fasteners, and the second lower electrode plate and the second lower electrode plate are fixedly connected by a plurality of insulating fasteners.

9. The passivation structure as described in claim 8, characterized in that, The main body of the boat frame is an integrally formed load-bearing frame. The first upper electrode plate and the second upper electrode plate are disposed on the top of the load-bearing frame, and the first lower electrode plate and the second lower electrode plate are disposed on the bottom of the load-bearing frame.

10. A passivation apparatus, characterized in that, It includes the passivation structure as described in any one of claims 1 to 9, and a reaction furnace in which the passivation structure is placed.

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