Fluid application device, photovoltaic cell, photovoltaic module and photovoltaic system

Abstract

The application relates to the photovoltaic technical field, and provides a fluid coating device, which comprises a containing groove for containing fluid; and at least two conical rollers, the conical roller comprising a conical side surface, a conical top surface and a conical bottom surface, the conical side surface being connected with the conical top surface and the conical bottom surface, the conical top surfaces of the two conical rollers being opposite, the conical side surface comprising a bearing part and a fluid guiding part, the fluid guiding part being located between the conical bottom surface and the bearing part of the conical roller, the bearing part being used for bearing a photovoltaic cell, the fluid guiding part being used for attaching fluid and flowing the fluid to the bearing part when rolling, and the orthographic projection of the conical roller on the bottom surface of the containing groove being at least partially located in the bottom surface. In the process of coating the fluid to the side wall of the photovoltaic cell, the waste of the fluid can be reduced, and the production cost of the photovoltaic cell is lowered.

Description

Technical Field

[0001] This application relates to the field of photovoltaic technology, and in particular to fluid coating apparatus, photovoltaic cells, photovoltaic modules and photovoltaic systems. Background Technology

[0002] During the manufacturing process of photovoltaic cells, fluids (such as coating solutions, printing solutions, aluminum paste or silver paste, etc.) need to be coated on the sidewalls of the photovoltaic cells and the edges adjacent to the photovoltaic cells.

[0003] The existing solution involves placing photovoltaic cells on a table and using screen printing or spraying equipment to coat the sidewalls of the photovoltaic cells and the edges of adjacent photovoltaic cells with fluid. Due to limitations in control precision, the fluid often overflows from the sidewalls of the photovoltaic cells and the edges of adjacent photovoltaic cells, causing the fluid to adhere to the table and resulting in fluid waste. This increases the production cost of photovoltaic cells. Furthermore, the edge coating precision of the photovoltaic cells cannot be controlled, and it is impossible to ensure that the edges are completely treated. Utility Model Content

[0004] This application provides a fluid coating apparatus, a photovoltaic cell, a photovoltaic module, and a photovoltaic system, which can reduce fluid waste and lower the production cost of photovoltaic cells during the process of coating fluid onto the sidewalls and adjacent edges of the photovoltaic cell, and can accurately control the edge precision of the coating on the photovoltaic cell to ensure that the edges are completely processed.

[0005] To achieve the above objectives, this application adopts the following technical solution:

[0006] In a first aspect, a fluid coating apparatus is provided, comprising: a receiving tank for receiving fluid; at least two conical rollers, each conical roller including a conical side surface, a conical top surface, and a conical bottom surface, the conical side surface connecting the conical top surface and the conical bottom surface, the conical top surfaces of the two conical rollers facing each other, the conical side surface including a bearing portion and a flow-guiding portion, the flow-guiding portion being located between the conical bottom surface of the conical roller and the bearing portion, the bearing portion being used to support photovoltaic cells, the flow-guiding portion adhering to fluid and causing the fluid to flow to the bearing portion during rolling, and the orthographic projection of the conical roller on the bottom surface of the receiving tank being at least partially located within the bottom surface.

[0007] In conjunction with the first aspect, in some embodiments of the first aspect, the taper of the tapered roller is 5°-80°.

[0008] In conjunction with the first aspect, in some embodiments of the first aspect, the taper of the tapered roller is 30°-50°.

[0009] In conjunction with the first aspect, in some embodiments of the first aspect, the fluid coating apparatus further includes a fluid lifting member, the bottom of which contacts the fluid and the top of which contacts the drainage portion, the fluid lifting member being used to lift the fluid from the bottom of the fluid lifting member to the top of the fluid lifting member.

[0010] In conjunction with the first aspect, in some embodiments of the first aspect, the fluid lifting element is at least one of a sponge or a capillary.

[0011] In conjunction with the first aspect, in some embodiments of the first aspect, the top of the fluid lifting member is a plane, and the plane is tangent to the drainage portion.

[0012] In conjunction with the first aspect, in some embodiments of the first aspect, the top of the fluid lifting member is curved, and the curved surface mates with the drainage portion.

[0013] In conjunction with the first aspect, in some embodiments of the first aspect, the distance between the drain portion and the bottom of the receiving tank along the depth direction of the receiving tank is less than the depth of the receiving tank.

[0014] In conjunction with the first aspect, in some embodiments of the first aspect, the radius of the cone base of the conical roller is 5cm-10cm.

[0015] In conjunction with the first aspect, in some embodiments of the first aspect, the height of the conical roller is 10cm-50cm along the axial direction of the conical roller.

[0016] In conjunction with the first aspect, in some embodiments of the first aspect, the radius of the cone apex of the conical roller is 2cm-7cm.

[0017] In a second aspect, a photovoltaic cell is provided, the photovoltaic cell including sidewalls and edges, the sidewalls and edges having a layered structure, the layered structure being formed by a fluid, the fluid being coated onto at least one of the sidewalls and edges by a fluid coating apparatus provided in the first aspect and any embodiment thereof.

[0018] Thirdly, a photovoltaic module is provided, which includes the photovoltaic cells provided in the second aspect.

[0019] Fourthly, a photovoltaic system is provided, which includes the photovoltaic modules provided in the third aspect.

[0020] Based on the solution provided by this utility model, since the top surfaces of the two conical rollers are arranged opposite each other and the drainage part is located between the bottom surface of the conical rollers and the supporting part, the drainage part can adhere to the fluid in the receiving groove during rolling and allow the fluid to flow to the side wall of the photovoltaic cell supported by the supporting part, thereby coating the side wall of the photovoltaic cell. At the same time, since the orthographic projection of the conical rollers on the bottom surface of the receiving groove is at least partially located within the bottom surface, excess fluid can flow back into the receiving groove as the conical rollers roll. This reduces fluid waste and lowers the production cost of the photovoltaic cell during the process of coating the fluid onto the side wall and adjacent edges of the photovoltaic cell. It also allows for precise control of the edge coating accuracy of the photovoltaic cell, ensuring that the edges are completely treated. Attached Figure Description

[0021] Figure 1 A schematic diagram of a fluid coating apparatus provided in this application;

[0022] Figure 2 A schematic diagram of another fluid coating device provided in this application;

[0023] Figure 3 This is a schematic diagram of another fluid coating device provided in this application.

[0024] Figure label:

[0025] Fluid coating device-10, receiving tank-101, fluid-20, conical roller-102, bearing part-1021, diversion part-1022, photovoltaic cell-30, fluid lifting component-103. Detailed Implementation

[0026] In this embodiment of the invention, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design described as "exemplary" or "for example" in this embodiment of the invention should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a specific manner to facilitate understanding.

[0027] Furthermore, to facilitate a clear description of the technical solutions of the embodiments of this utility model, the terms "first" and "second" are used in the embodiments of this utility model to distinguish identical or similar items with essentially the same function and effect. Those skilled in the art will understand that the terms "first" and "second" do not limit the quantity or execution order, and the terms "first" and "second" are not necessarily different.

[0028] It is understood that the term "embodiment" used throughout the specification means that a specific feature, structure, or characteristic related to an embodiment is included in at least one embodiment of the present invention. Therefore, the various embodiments throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. It is understood that in the various embodiments of the present invention, the sequence number of each process does not imply the order of execution; the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0029] It is understood that in this utility model, "when," "if," and "if" all refer to the corresponding processing that will be carried out under certain objective circumstances, and are not limited to a time, nor do they require that there must be a judgment action when it is implemented, nor do they mean that there are other limitations.

[0030] It is understood that some optional features in the embodiments of this utility model can be implemented independently in certain scenarios without relying on other features, such as the current solution on which they are based, to solve the corresponding technical problems and achieve the corresponding effects. Alternatively, they can be combined with other features as needed in certain scenarios. Correspondingly, the device given in the embodiments of this utility model can also implement these features or functions, which will not be elaborated here.

[0031] In this utility model, unless otherwise specified, the same or similar parts between the various embodiments can be referred to each other. In the various embodiments and implementation methods of this utility model, unless otherwise specified or logically conflicting, the terminology and / or descriptions between different embodiments and between the implementation methods of different embodiments are consistent and can be mutually referenced. The technical features in different embodiments and between the implementation methods of different embodiments can be combined according to their inherent logical relationships to form new embodiments, implementation methods, implementation methods, or implementation approaches. The following embodiments of this utility model do not constitute a limitation on the scope of protection of this utility model.

[0032] During the manufacturing process of photovoltaic cell 30, fluid 20 (such as coating solution, printing solution, aluminum paste or silver paste, etc.) needs to be coated on the sidewalls of photovoltaic cell 30 and the edges adjacent to photovoltaic cell 30.

[0033] The existing solution involves placing the photovoltaic cell 30 on a table and using screen printing or spraying equipment to coat the sidewalls of the photovoltaic cell 30 and the edges adjacent to the photovoltaic cell 30. Due to limitations in control precision, the fluid 20 often overflows from the sidewalls of the photovoltaic cell 30 and the edges adjacent to the photovoltaic cell 30, causing the fluid 20 to adhere to the table surface, resulting in waste of the fluid 20 and increasing the production cost of the photovoltaic cell 30. Furthermore, the edge coating precision of the photovoltaic cell 30 cannot be controlled, and it cannot be ensured that the edges are completely treated.

[0034] To solve the above problems, this utility model provides a fluid coating device 10, such as... Figures 1-3 As shown, the fluid coating apparatus 10 includes: a receiving tank 101 for receiving fluid 20; at least two conical rollers 102, each conical roller 102 including a conical side surface, a conical top surface, and a conical bottom surface, the conical side surface connecting the conical top surface and the conical bottom surface, the conical top surfaces of the two conical rollers facing each other, the conical side surface including a support portion 1021 and a drainage portion 1022, the drainage portion 1022 being located between the conical bottom surface of the conical roller 102 and the support portion 1021, the support portion 1021 for supporting photovoltaic cells 30, the drainage portion 1022 adhering to the fluid 20 during rolling and causing the fluid 20 to flow to the support portion 1021, the orthographic projection of the conical roller 102 on the bottom surface of the receiving tank 101 being at least partially located within the bottom surface.

[0035] Based on the solution provided by this utility model, since the top surfaces of the two conical rollers 102 are arranged opposite each other and the flow guide 1022 is located between the bottom surface of the conical rollers 102 and the supporting part, the flow guide 1022 can adhere to the fluid 20 in the receiving groove 101 during rolling and allow the fluid 20 to flow to the side wall of the photovoltaic cell 30 supported by the supporting part 1021 and the edge of the adjacent photovoltaic cell 30, thereby coating the side wall of the photovoltaic cell 30 and the edge of the adjacent photovoltaic cell 30. At the same time, since the orthographic projection of the conical rollers 102 on the bottom surface of the receiving groove 101 is at least partially located in the bottom surface, excess fluid can flow back into the receiving groove 101 as the conical rollers 102 roll, thereby reducing the waste of fluid 20 during the process of coating the side wall of the photovoltaic cell 30 and the edge of the adjacent photovoltaic cell 30, reducing the production cost of the photovoltaic cell 30, and accurately controlling the edge precision of coating the photovoltaic cell 30, ensuring that the edge is completely processed.

[0036] After the fluid 20 is coated on the sidewall of the photovoltaic cell 30 and the edge adjacent to the photovoltaic cell 30, it is dried to form a film layer on the sidewall and the edge adjacent to the photovoltaic cell 30.

[0037] The fluid 20 can be at least one of indium tin oxide solution, tungsten oxide solution, aluminum oxide solution, silicon oxide solution, or titanium oxide solution. Of course, the fluid 20 can also be other liquids, and this invention does not impose specific limitations on it.

[0038] The width of the receiving groove 101 can be 20cm-50cm. For example, the width of the receiving groove 101 can be 20cm, 30cm, 40cm, or 50cm. Of course, the width of the receiving groove 101 can also have other values. The width of the receiving groove 101 can be designed according to the width of the photovoltaic cell 30. This utility model does not impose specific limitations in this regard. In this way, it can avoid the situation where the width of the receiving groove 101 is too wide, resulting in too much fluid 20 being contained in the receiving groove 101, thus increasing the amount of fluid 20 used. It can also avoid the situation where the width of the receiving groove 101 is too narrow, resulting in a mismatch between the width of the receiving groove 101 and the width of the photovoltaic cell 30, thus reducing the coating efficiency.

[0039] The length of the receiving groove 101 can be 400cm-800cm. For example, the length of the receiving groove 101 can be 400cm, 500cm, 600cm, 700cm, or 800cm. Of course, the length of the receiving groove 101 can also have other values. The length of the receiving groove 101 can be designed according to the length of the photovoltaic cell 30. This utility model does not impose specific limitations in this regard. In this way, it can avoid the situation where the length of the receiving groove 101 is too long, resulting in too much fluid 20 being contained in the receiving groove 101, thus increasing the amount of fluid 20 used. It can also avoid the situation where the length of the receiving groove 101 is too short, resulting in the fluid 20 being coated on the side wall and the edge of the photovoltaic cell 30 and dripping outside the receiving groove 101 during the movement of the photovoltaic cell 30, thus causing waste of fluid 20.

[0040] The depth of the receiving groove 101 can be 10cm-40cm. For example, the depth of the receiving groove 101 can be 10cm, 20cm, 30cm, or 40cm. Of course, the depth of the receiving groove 101 can also have other values. The depth of the receiving groove 101 can be designed according to the volume of fluid 20 to be contained. This utility model does not impose specific limitations in this regard. In this way, it can avoid the situation where the receiving groove 101 is too deep, resulting in too much fluid 20 contained in the receiving groove 101, thus increasing the amount of fluid 20 used. It can also avoid the situation where the receiving groove 101 is too shallow, resulting in too little fluid 20 contained in the receiving groove 101, thus increasing the risk that the fluid 20 cannot adhere to the drainage part 1022 and reducing the coating effect.

[0041] The receiving tank 101 can be made of at least one of the following materials: fiberglass, polypropylene, polyvinyl chloride, or polyvinylidene fluoride. Of course, the receiving tank 101 can also be made of other materials, and this utility model does not impose specific limitations on this.

[0042] At least two conical rollers 102 are provided above the receiving groove 101. The conical rollers 102 can be cones, that is, the top surface of the cone roller 102 is the vertex, or, as... Figure 1 or Figure 2 As shown, the conical roller 102 can also be a frustum, that is, the conical roller 102 includes a bottom surface and a top surface, and the area of ​​the top surface is smaller than the area of ​​the bottom surface. This utility model does not impose specific limitations on this.

[0043] Along the axial direction of the conical roller 102, the conical roller 102 has a certain height, which can be 10cm-50cm. For example, the height of the conical roller 102 can be 10cm, 20cm, 30cm, 40cm, or 50cm. Of course, the height of the conical roller 102 can also have other values, and this utility model does not impose specific limitations on this. In this way, it can avoid the risk of the photovoltaic cell 30 slipping off the conical roller 102 if the height of the conical roller 102 is too low, and it can also avoid the cost of the conical roller 102 being too high. Setting an appropriate height for the conical roller 102 can increase the stability of the conical roller 102 in supporting the photovoltaic cell 30 and reduce the cost of the conical roller 102.

[0044] It should be noted that when the conical roller 102 is a cone, the height of the conical roller 102 refers to the vertical distance between the apex and the base of the cone. When the conical roller 102 is a frustum, the height of the conical roller 102 refers to the vertical distance between the top point and the base of the cone.

[0045] The radius of the conical base of the conical roller 102 can be 5cm-10cm. For example, the radius of the conical base of the conical roller 102 can be 5cm, 6cm, 7cm, 8cm, 9cm, or 10cm. Of course, the radius of the conical base of the conical roller 102 can also have other values, and this utility model does not impose specific limitations on this. In this way, it can avoid the flow velocity of the fluid 20 on the conical side of the conical roller 102 being too small due to the radius of the conical base of the conical roller 102 being too low, and it can also avoid the flow velocity of the fluid 20 on the conical side of the conical roller 102 being too large due to the radius of the conical base of the conical roller 102 being too high. By setting an appropriate radius for the conical base of the conical roller 102, the flow velocity of the fluid 20 on the conical side of the conical roller 102 can be controlled.

[0046] When the conical roller 102 is a frustum, the radius of the apex surface of the conical roller 102 can be 2cm-7cm. For example, the radius of the apex surface of the conical roller 102 can be 2cm, 3cm, 4cm, 5cm, 6cm, or 7cm. Of course, the radius of the apex surface of the conical roller 102 can also have other values, and this utility model does not impose specific limitations on this. In this way, it is possible to avoid the flow velocity of the fluid 20 on the conical side surface of the conical roller 102 being too small if the radius of the apex surface of the conical roller 102 is too small, and it is also possible to avoid the flow velocity of the fluid 20 on the conical side surface of the conical roller 102 being too large if the radius of the apex surface of the conical roller 102 is too large. By setting an appropriate radius for the apex surface of the conical roller 102, the flow velocity of the fluid 20 on the conical side surface of the conical roller 102 can be controlled.

[0047] The taper of the conical roller 102 is determined by the radius and height of the bottom surface of the cone, and the taper α of the conical roller 102 can be 5°-80°. Preferably, the taper α of the conical roller 102 is 30°-50°, for example, 30°, 35°, 40°, 45°, and 50°. Of course, the taper α of the conical roller 102 can also have other angles, and this utility model does not impose specific limitations on this. In this way, by setting the taper of the conical roller 102 within a suitable range, it is possible to avoid insufficient coating of fluid on the sidewall of the photovoltaic cell 30 and the edge adjacent to the photovoltaic cell 30 due to the excessively fast flow speed of the fluid 20 on the conical side surface of the conical roller 102, and also to avoid excessive coating of fluid on the sidewall of the photovoltaic cell 30 and the edge adjacent to the photovoltaic cell 30 due to the excessively slow flow speed of the fluid 20 on the conical side surface of the conical roller 102. Setting a suitable taper for the conical roller 102 can improve the coating effect of the photovoltaic cell 30. Furthermore, by controlling the taper of the conical roller 102, the angle between the photovoltaic cell 30 and the conical side can be controlled. The smaller the angle, the wider the coating width of the fluid 20 on the edge of the photovoltaic cell 30; conversely, the larger the angle, the narrower the coating width. Therefore, by controlling the taper of the conical roller 102, the coating width of the fluid 20 on the edge of the photovoltaic cell 30 can be controlled.

[0048] The conical side surface of the conical roller 102 may include a bearing portion 1021, such as Figure 1 As shown, after the photovoltaic cell 30 is placed on the conical side surface of the conical roller 102, there will be a contact point on the conical side surface of the conical roller 102 that contacts the photovoltaic cell 30. The bearing part 1021 includes the part on the conical side surface of the conical roller 102 that intersects with the plane where the contact point is located. This plane is parallel to the conical bottom surface of the conical roller 102.

[0049] The conical side surface of the conical roller 102 may also include a drainage portion 1022, such as... Figure 1 As shown, the drainage portion 1022 includes a portion on the conical side surface of the conical roller 102 between the bearing portion 1021 and the conical bottom surface of the conical roller 102, that is, the drainage portion 1022 is located between the conical bottom surface of the conical roller 102 and the bearing portion 1021.

[0050] The orthographic projection of the conical roller 102 onto the bottom surface of the receiving groove 101 is at least partially located within the bottom surface. This can be the portion of the conical roller 102 excluding the drainage portion 1022 and the supporting portion 1021, whose orthographic projection onto the bottom surface of the receiving groove 101 is located within the bottom surface; or, as... Figures 1-3 As shown, the orthographic projection of all parts of the conical roller 102 onto the bottom surface of the receiving groove 101 may also lie within the bottom surface; however, this utility model does not impose specific limitations on this.

[0051] To transfer fluid 20 from the drainage section 1022 to the carrier section 1021, one possible implementation is as follows: Figure 1 As shown, along the depth direction of the receiving tank 101, the distance h1 between the flow guide 1022 and the bottom of the receiving tank 101 is less than the depth h2 of the receiving tank 101. Thus, as long as the depth of the fluid in the receiving tank 101 is greater than h1, the flow guide 1022 can carry the fluid 20 to the bearing part 1021 during the rotation of the conical roller 102, thereby coating the fluid 20 onto the sidewall of the photovoltaic cell 30 and the edge adjacent to the photovoltaic cell 30. There is no need to transfer the fluid 20 to the flow guide 1022 through additional equipment, which reduces the cost of the fluid coating device 10.

[0052] As another possible implementation, such as Figure 2 As shown, the fluid coating apparatus 10 may further include a fluid lifting member 103. The bottom of the fluid lifting member 103 contacts the fluid, and the top of the fluid lifting member 103 contacts the drainage portion. The fluid lifting member 103 is used to lift the fluid 20 from the bottom of the fluid lifting member 103 to the top of the fluid lifting member 103. In this way, when the liquid level of the fluid 20 is low, there is no need for the drainage portion 11022 of the conical roller 102 to directly contact the fluid 20. When the depth of the fluid 20 in the receiving tank 101 is shallow, the fluid lifting member 103 can also lift the fluid to the drainage portion 1022, thereby coating the fluid 20 onto the sidewall of the photovoltaic cell 30 and the edge adjacent to the photovoltaic cell 30. This reduces the amount of fluid 20 stored in the receiving tank 1011 and can prevent excessive fluid 20 from contacting the air and deteriorating.

[0053] When the fluid coating apparatus 10 includes multiple sets of opposing conical rollers 102, the fluid lifting member 103 can be disposed on the drainage portion 1022 of at least one set of conical rollers 102. Providing an appropriate number of fluid lifting members 103 can prevent a reduction in the amount of fluid 20 coated onto the sidewalls of the photovoltaic cell 30 and the edges adjacent to the photovoltaic cell 30 due to a small number of fluid lifting members 103, thus avoiding a decrease in the coating effect. Conversely, it can also prevent an increase in the cost of fluid coating due to a large number of fluid lifting members 103.

[0054] The fluid lifting member 103 can be at least one of a centrifugal pump, deep well pump, submersible pump, air pump, jet pump, sponge, or capillary tube. Preferably, the fluid lifting member 103 is at least one of a sponge or capillary tube. In this way, since the sponge or capillary tube has capillary action, no external power is required to lift the fluid 20 from the bottom to the top of the fluid lifting member 103, thus reducing the cost of fluid coating.

[0055] When the fluid lifting component 103 is composed of a sponge and a capillary tube, the sponge and the capillary tube can be bonded together with an adhesive.

[0056] To transfer the fluid 20 at the top of the fluid lifter to the drainage section 1022, one possible implementation is as follows: Figure 2 As shown, the top of the fluid lifting member is flat and tangent to the drainage portion 1022. In other words, the portion of the drainage portion 1022 that contacts the top of the sponge or capillary is strip-shaped. Thus, because the top of the fluid lifting member is flat and tangent to the drainage portion 1022, the fluid 20 at the top of the fluid lifting member can be transferred to the drainage portion 1022 through the smaller contact area. This allows the fluid 20 to be coated onto the sidewalls of the photovoltaic cell 30 and the edges adjacent to the photovoltaic cell 30. Furthermore, it reduces the friction between the top and the drainage portion 1022, thereby reducing the driving energy consumption of the conical roller 102.

[0057] As another possible implementation, the top of the fluid lifting member is curved, and the curved surface cooperates with the drainage part. That is, the part of the drainage part 1022 that contacts the top of the sponge or capillary is planar. In this way, since the top of the fluid lifting member has a curved surface that contacts the drainage part 1022, the fluid 20 on the top of the fluid lifting member can be transferred to the drainage part 1022 through the larger contact surface. On the one hand, the fluid 20 can be coated onto the sidewall of the photovoltaic cell 30 and the edge adjacent to the photovoltaic cell 30. On the other hand, more fluid 20 can be transferred to the drainage part 1022, improving the fluid coating effect.

[0058] Along the axial direction of the conical roller 102, the top of the fluid lifting member 103 has a certain size. The larger the size of the top of the fluid lifting member 103, the larger the contact area between the fluid lifting member 103 and the drainage part 1022, and the better the transfer effect of fluid 20 from the fluid lifting member 103 to the drainage part 1022. The smaller the size of the top of the fluid lifting member 103, the smaller the contact area between the fluid lifting member 103 and the drainage part 1022, and the smaller the friction between the fluid lifting member 103 and the drainage part 1022. Therefore, the size of the top of the fluid lifting member 103 can be determined according to actual needs, and this utility model does not impose specific limitations in this regard.

[0059] For example, along the axial direction of the conical roller 102, the size of the top of the fluid lifting member 103 is less than or equal to the size of the drainage portion 1022. This avoids both insufficient fluid 20 transferred to the drainage portion 1022 due to an excessively small size of the top of the fluid lifting member 103, resulting in poor coating effect, and excessive friction between the top of the fluid lifting member 103 and the conical roller 102 due to an excessively large size, thus increasing the driving energy consumption of the conical roller 102. Setting an appropriate size for the top of the fluid lifting member 103 can improve the coating effect and reduce the driving energy consumption of the conical roller 102.

[0060] For example, taking the dimension of the drainage part 1022 along the axial direction of the conical roller 102 as 20cm, the dimension of the top of the fluid lifting member 103 can be 5cm, 10cm, 15cm, or 20cm. Of course, the dimension of the top of the fluid lifting member 103 can also have other values, and this utility model does not impose specific limitations on this.

[0061] Understandably, along the axial direction of the conical roller 102, when the size of the top of the fluid lifting member 103 is equal to the size of the drainage part 1022, one side of the top of the fluid lifting member 103 contacts the conical bottom surface of the conical roller 102, and the other side contacts the bearing part 1021.

[0062] Along the axial direction of the conical roller 102, when the size of the top of the fluid lifting member 103 is smaller than the size of the drainage part 1022, the top of the fluid lifting member 103 may contact the conical bottom surface of the conical roller 102 on one side and not contact the bearing part 1021 on the other side; or, the top of the fluid lifting member 103 may not contact the conical bottom surface of the conical roller 102 on one side and contact the bearing part 1021 on the other side; or, the top of the fluid lifting member 103 may not contact the conical bottom surface of the conical roller 102 on one side and also not contact the bearing part 1021 on the other side. This utility model does not impose specific limitations in this regard.

[0063] Furthermore, in addition to the components described above, the fluid coating apparatus 10 may also include other components. For example, the fluid coating apparatus 10 may also include a support member connected to the conical roller, which can support and fix the conical roller 102 to prevent displacement of the conical roller 102.

[0064] For example, the support member can be a support frame, a hanging rail, etc., and this utility model does not impose specific limitations on it.

[0065] The fluid coating apparatus 10 may also include a drive unit connected to a conical roller. The drive unit can provide rotational power to the conical roller 102, driving the conical roller 102 to rotate, so that the conical roller 102 drives the photovoltaic cell 30 to move.

[0066] For example, the driving component can be a motor, etc., and this utility model does not impose specific limitations on it.

[0067] Of course, the fluid coating device 10 may also include other components, and this utility model does not impose specific limitations on this.

[0068] This utility model also provides a photovoltaic cell 30, which includes sidewalls and edges. The sidewalls and edges have a layered structure. The layered structure is formed by a fluid 20. The fluid 20 is coated onto at least one of the sidewalls and edges by the fluid coating device 10 provided in the above specific embodiments.

[0069] The photovoltaic cell 30 can be an HJT cell, a back contact cell, or a TOPCon cell. Of course, the photovoltaic cell 30 can also be other types of photovoltaic cells, and this utility model does not impose specific limitations on this.

[0070] The photovoltaic cell 30 can be composed of a silicon substrate and various film layers disposed on the silicon substrate. For example, the photovoltaic cell 30 is composed of a silicon substrate and a tunneling oxide layer, a doped layer and a passivation layer disposed sequentially on the silicon substrate. Of course, other film layers can also be disposed on the silicon substrate. This utility model does not impose specific limitations on the specific film layer structure of the photovoltaic cell.

[0071] The silicon substrate can be monocrystalline silicon, polycrystalline silicon, or amorphous silicon, and this invention does not impose any specific restrictions on it.

[0072] This utility model also provides a photovoltaic module, which includes the photovoltaic cell 30 provided in the above embodiments.

[0073] Furthermore, photovoltaic modules may also include a metal frame, a backsheet, photovoltaic glass, and an encapsulating film. The encapsulating film can be filled between the front and back of the photovoltaic cells 30, the photovoltaic glass, and adjacent photovoltaic cells 30. As a filler, it can be a transparent colloid with good light transmission and aging resistance. For example, the encapsulating film can be EVA film or POE film, and the specific choice can be made according to the actual situation. There are no restrictions here.

[0074] Photovoltaic glass can be applied to the encapsulating film on the front side of the photovoltaic cell 30. The photovoltaic glass can be ultra-clear glass, which has high light transmittance, high transparency, and superior physical, mechanical, and optical properties. For example, ultra-clear glass can achieve a light transmittance of over 93%. It can protect the photovoltaic cell 30 while minimizing impact on its efficiency. Simultaneously, the encapsulating film bonds the photovoltaic glass and the photovoltaic cell 30 together, providing sealing, insulation, waterproofing, and moisture protection for the photovoltaic cell 30.

[0075] The backsheet can be attached to the encapsulant film on the back of the photovoltaic cell 30. The backsheet provides protection and support for the photovoltaic cell 30, and has reliable insulation, water resistance, and aging resistance. Multiple backsheet options are available, typically including tempered glass, acrylic glass, aluminum alloy TPT composite encapsulant film, etc., and the specific choice is determined based on the specific circumstances and is not limited here. The backsheet, photovoltaic cell 30, encapsulant film, and photovoltaic glass can be integrated within a metal frame. The metal frame serves as the main external support structure for the entire photovoltaic module, providing stable support and installation. For example, the photovoltaic module can be installed at the desired location using the metal frame.

[0076] This utility model provides a photovoltaic system, including the photovoltaic module provided in the above embodiment.

[0077] In this embodiment, the photovoltaic system can be applied in photovoltaic power plants, such as ground-mounted power plants, rooftop power plants, and floating power plants. It can also be applied to equipment or devices that utilize solar energy to generate electricity, such as user solar power supplies, solar streetlights, solar cars, and solar buildings. Of course, it is understood that the application scenarios of the photovoltaic system are not limited to these; that is, the photovoltaic system can be applied in all fields that require solar energy to generate electricity. Taking a photovoltaic power generation system network as an example, the photovoltaic system may include a photovoltaic array, a combiner box, and an inverter. The photovoltaic array may be an array combination of multiple photovoltaic modules; for example, multiple photovoltaic modules can form multiple photovoltaic arrays. The photovoltaic array is connected to the combiner box, which can collect the current generated by the photovoltaic array. The collected current flows through the inverter and is converted into AC power required by the mains power grid before being connected to the mains power grid to achieve solar power supply.

[0078] Although the present invention has been described herein in conjunction with various embodiments, those skilled in the art will understand and implement other variations of the disclosed embodiments by reviewing the accompanying drawings, the disclosure, and the appended claims in carrying out the claimed invention. In the claims, the word "comprising" does not exclude other components or steps, and "a" or "an" does not exclude a plurality. While different dependent claims may recite certain measures, this does not mean that these measures cannot be combined to produce a good effect.

[0079] Although the present invention has been described in conjunction with specific features and embodiments, it is obvious that various modifications and combinations can be made thereto without departing from the spirit and scope of the present invention. Accordingly, this specification and drawings are merely exemplary descriptions of the present invention as defined by the appended claims, and are considered to cover any and all modifications, variations, combinations, or equivalents within the scope of the present invention. Clearly, those skilled in the art can make various alterations and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and modifications of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and modifications.

Claims

1. A fluid coating apparatus, characterized in that, The fluid coating apparatus includes: A container tank used to hold fluids; At least two conical rollers, each conical roller including a conical side surface, a conical top surface, and a conical bottom surface, the conical side surface connecting the conical top surface and the conical bottom surface, the conical top surfaces of the two conical rollers facing each other, the conical side surface including a support portion and a flow-guiding portion, the flow-guiding portion being located between the conical bottom surface of the conical roller and the support portion, the support portion being used to support photovoltaic cells, the flow-guiding portion adhering to the fluid during rolling and causing the fluid to flow to the support portion, the orthographic projection of the conical roller on the bottom surface of the receiving groove being at least partially located within the bottom surface.

2. The fluid coating apparatus according to claim 1, characterized in that, The taper of the tapered roller is 5°-80°.

3. The fluid coating apparatus according to claim 2, characterized in that, The taper of the tapered roller is 30°-50°.

4. The fluid coating apparatus according to any one of claims 1-3, characterized in that, The fluid coating device further includes a fluid lifting member, the bottom of which contacts the fluid and the top of which contacts the drainage portion. The fluid lifting member is used to lift the fluid from the bottom to the top of the fluid lifting member.

5. The fluid coating apparatus according to claim 1, characterized in that, The fluid lifting component is at least one of a sponge or a capillary tube.

6. The fluid coating apparatus according to claim 5, characterized in that, The top of the fluid lifting component is a plane, and the plane is tangent to the drainage part.

7. The fluid coating apparatus according to claim 5, characterized in that, The top of the fluid lifting component is curved, and the curved surface mates with the drainage part.

8. The fluid coating apparatus according to any one of claims 1-3, characterized in that, Along the depth direction of the receiving groove, the distance between the drainage portion and the bottom of the receiving groove is less than the depth of the receiving groove.

9. The fluid coating apparatus according to any one of claims 1-3, characterized in that, The radius of the conical bottom surface of the conical roller is 5cm-10cm.

10. The fluid coating apparatus according to any one of claims 1-3, characterized in that, Along the axial direction of the conical roller, the height of the conical roller is 10cm-50cm.

11. The fluid coating apparatus according to any one of claims 1-3, characterized in that, The radius of the cone apex of the conical roller is 2cm-7cm.

12. A photovoltaic cell, characterized in that, The photovoltaic cell includes sidewalls and edges, the sidewalls and edges having a layered structure, the layered structure being formed by a fluid, the fluid being coated onto at least one of the sidewalls and the edges by a fluid coating apparatus according to any one of claims 1-11.

13. A photovoltaic module, characterized in that, The photovoltaic module includes the photovoltaic cell as described in claim 12.

14. A photovoltaic system, characterized in that, The photovoltaic system includes the photovoltaic module as described in claim 13.

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