Preparation method of back contact photovoltaic module

Abstract

The invention relates to a preparation method of a back contact photovoltaic module. The preparation method comprises the following steps: placing a battery piece on a platform with an adsorption function, and adsorbing and fixing the battery piece; placing a welding strip on the adsorbed battery piece; fixing the welding strip and the battery piece by using a bonding substance; welding the welding strip, the battery piece and the bus bar to form a battery string array; placing a back adhesive film and a back plate on the battery string array to form a to-be-laminated piece; and laminating the to-be-laminated piece, and welding the welding strip and the battery piece during lamination. According to the method, the back contact battery pieces are adsorbed and fixed to perform battery array arrangement, direct arrangement of the battery pieces on a pre-thermally compounded front plate and front adhesive film assembly is replaced, the risks of lamination bubbles and peeling strength reduction are reduced, meanwhile, the welding strip and the battery pieces are welded during lamination, so that a plurality of battery pieces do not need to be welded into a battery string before lamination, and the production efficiency is improved. Therefore, battery string warping caused by a series welding process can be avoided, and risks of subfissure and fragmentation of battery pieces are reduced.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic technology, and in particular to a method for preparing a back-contact photovoltaic module. Background Art

[0002] In the current string soldering process of back-contact battery cells, because only the back solder points are welded to the solder ribbon, the battery cells welded in a string will warp due to the stress of the solder ribbon, which makes it easy for hidden cracks and fragments to appear in the subsequent production process, resulting in low yield of back-contact battery modules and affecting long-term reliability.

[0003] Chinese patent application CN116936683A discloses a back-contact battery assembly and its manufacturing method, as well as a photovoltaic system. The manufacturing method adopted is: placing multiple battery cells on the assembly of the front plate and the front adhesive film; placing a welding strip on the assembly with the battery cells; placing a back adhesive film and a back plate on the welding strip to form a laminated part; laminating the laminated part, and welding the welding strip and the battery cells during lamination. In this way, since the welding strip and the battery cells are welded during lamination, it is not necessary to weld multiple battery cells into a battery string before lamination, thereby avoiding the warping of the battery string caused by the string welding process and reducing the risk of hidden cracks and fragments of the battery cells.

[0004] In the process of implementing the above technology, the applicant found that it had at least the following problems: (1) When the front adhesive film and the front plate are thermally laminated, a release film must be used for protection, which increases the cost of the release film (usually it needs to be replaced after lamination 10 times), and pre-lamination equipment must be added, which increases equipment investment; (2) The adhesive film is a thermosetting material. After multiple hot-pressing laminations, the peel strength between the adhesive film and the glass is reduced, which poses a hidden danger and increases the risk of lamination bubbles. Summary of the invention

[0005] Based on this, it is necessary to provide a method for preparing a back-contact photovoltaic module to address the risk of lamination bubbles in the preparation process of back-contact photovoltaic modules in the prior art.

[0006] A method for preparing a back-contact photovoltaic module comprises the following steps: placing a battery cell on a platform with an adsorption function and fixing it by adsorption; placing a welding strip on the adsorbed battery cell; fixing the welding strip and the battery cell by using an adhesive; welding the welding strip, the battery cell and a bus bar to form a battery string array; placing a backing film and a back plate on the battery string array to form a laminated part; laminating the laminated part, and welding the welding strip and the battery cell during lamination.

[0007] In some embodiments, placing a battery cell on a platform with an adsorption function and fixing it by adsorption includes: placing a plurality of battery strings in sequence, wherein a plurality of battery cells in the same battery string are placed on the platform at the same time.

[0008] In some embodiments, placing a soldering ribbon on the adsorbed battery cell includes: placing a plurality of soldering ribbons on each battery string simultaneously in sequence.

[0009] In some embodiments, the soldering ribbon and the battery cell are fixed by using an adhesive, including: applying glue to the soldering ribbon by using a UV inkjet process and curing it simultaneously to form a plurality of glue spots.

[0010] In some embodiments, the number of glue dots on each solder ribbon is 2-20.

[0011] In some embodiments, the width of the glue dot is greater than the width of the welding strip.

[0012] In some embodiments, the width of the glue dots is 0.8 mm-2 mm.

[0013] In some embodiments, the soldering ribbon and the battery cell are fixed by using an adhesive, including: providing a reflective film on the soldering ribbon, wherein the reflective surface of the reflective film faces the battery cell.

[0014] In some embodiments, a Teflon coating is provided on the adsorption surface of the platform.

[0015] In some embodiments, after the step of welding the welding ribbon, the battery cell and the bus bar to form a battery string array, and before the step of placing a backing film and a back panel on the battery string array to form a laminated component, it also includes: placing the battery string array on a front panel with a front adhesive film.

[0016] The preparation method of the above-mentioned back-contact photovoltaic module, on the one hand, arranges the battery array by adsorbing and fixing the back-contact battery cells, instead of directly setting the battery cells on the pre-heat-compounded front plate and front film assembly, omitting the use of release film protection, and there is no need to use pre-lamination equipment to pre-laminate the front plate and front film assembly in advance, thereby reducing the risk of lamination bubbles and reduced peel strength, making the process simpler and easier to adsorb to ensure the flatness of the battery cells and reduce the risk of welding ribbon placement deviation; on the other hand, the welding ribbon and the battery cells are welded during lamination, so there is no need to weld multiple battery cells into a battery string before lamination, thereby avoiding the warping of the battery string caused by the string welding process and reducing the risk of hidden cracks and fragments of the battery cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the process of manufacturing a back-contact photovoltaic module according to an embodiment of the present application.

[0018] Figure 2 It is a schematic structural diagram of a platform with adsorption function in step S100 of the method for manufacturing a back-contact photovoltaic module of the present application.

[0019] Figure 3 This is a schematic diagram of the implementation of step S100 of the method for manufacturing a back-contact photovoltaic module of the present application.

[0020] Figure 4 This is a schematic diagram of the implementation of step S200 of the method for manufacturing a back-contact photovoltaic module of the present application.

[0021] Figure 5 Schematic diagram of the implementation of the first method of steps S300 and S400 of the method for manufacturing a back-contact photovoltaic module of the present application.

[0022] Figure 6 for Figure 5 The local structure shows the connection status between two adjacent battery cells in the battery string.

[0023] Figure 7 It is a schematic diagram of the implementation of the second method of steps S300 and S400 of the method for manufacturing a back-contact photovoltaic module of the present application.

[0024] Figure 8 This is a schematic diagram of the planar structure of the reflective film tape of the present application.

[0025] Reference numerals:

[0026] 10. Platform; 110. Adsorption surface; 120. Vacuum adsorption hole; 20. Battery cell; 30. Solder ribbon; 40. Battery string module; 410. Battery string; 50. Bus bar; 60. Adhesive; 610. Glue point; 620. Reflective film tape; 621. Reflective area; 622. Transparent area. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0028] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0029] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0030] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0031] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0032] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0033] This application proposes a method for preparing a back-contact photovoltaic module, which realizes the convergence welding of battery string arrays through adsorption function, realizes the welding of welding strips and battery cells during the lamination process, eliminates the warping of battery cells due to the stress of welding strips, reduces the risk of hidden cracks and fragments, and eliminates the pre-lamination process, reduces the risk of lamination bubbles and peel strength reduction. The following is a detailed description with reference to the accompanying drawings.

[0034] See also Figure 1, a method for preparing a back-contact photovoltaic module according to an embodiment of the present application includes the following steps.

[0035] S100 , placing a battery cell 20 on a platform 10 with an adsorption function and fixing it by adsorption.

[0036] like Figure 1 and Figure 2 As shown, in step S00, firstly, a platform 10 with an adsorption function is provided, and then the battery cells 20 are placed on the platform 10 in the required array form, and it is ensured that each battery cell 20 is adsorbed.

[0037] The platform 10 is, for example, an insulating flat plate, and a plurality of vacuum adsorption holes 120 are provided on its adsorption surface 110 . The vacuum adsorption holes 120 are connected to a vacuum pump (not shown) to be able to adsorb the battery cell 20 .

[0038] The cells 20 are placed on the platform 10 in the required array form, and each cell 20 is ensured to be adsorbed. Specifically, the light-receiving surface of the cell 20 faces the platform 10 and is adsorbed on the platform 10. The light-receiving surface is the side of the cell 20 that directly faces the sun when the back contact photovoltaic module is in use.

[0039] The vacuum adsorption holes 120 may be configured in the following manner: corresponding to the battery cells 20 that need to be arranged in an array, more than two vacuum adsorption holes 120 are used to adsorb the same battery cell 20 .

[0040] S200 , placing a soldering ribbon 30 on the adsorbed battery cell 20 .

[0041] The number of soldering ribbons 30 placed matches the arrangement of the battery string 410 to be formed. The soldering ribbon 30 can be, for example, a normal temperature soldering ribbon or a low temperature soldering ribbon with a tinned layer formed on the surface.

[0042] Exemplary, reference Figure 3 and Figure 4 , the plurality of battery cells 20 will constitute at least two battery string modules 40 arranged along the first direction X. Each battery string module 40 includes a plurality of battery strings 410 arranged along the second direction Y. Each battery string 410 includes a plurality of battery cells 20 arranged along the first direction X. The second direction Y is perpendicular to the first direction X. Figure 3 and Figure 4 In the figure, only two battery string modules 40 are schematically shown, and each battery string module 40 includes six battery strings 410. It should be noted that the number of battery string modules 40 and battery strings 410 is not limited to two, for example, it can also be one, or more than two. In addition, each battery string 410 specifically includes eight battery cells 20, but the number is not limited to eight. Usually, the number of battery cells 20 in each battery string 410 is at least two.

[0043] When placing the welding strips 30, in the same battery string 410, a plurality of welding strips 30 to be connected to the adjacent two battery cells 20 are arranged between the adjacent two battery cells 20. Between the adjacent battery string modules 40, a gap is reserved for placing the bus bar 50. The bus bar 50 is welded to the welding strips 30 at the ends of the adjacent battery string modules 40. The bus bar 50 is used to converge the current derived from each welding strip 30. The welding strip 30 at the end of the battery string module 40 refers to the welding strip 30 on the battery cell 20 of the battery string module 40 close to another battery string module 40 in the first direction X.

[0044] S300 , fixing the soldering ribbon 30 and the battery cell 20 by using an adhesive 60 .

[0045] refer to Figure 4 and Figure 5 In step S300, each soldering ribbon 30 is connected to the corresponding battery cell 20 by using an adhesive 60. Optionally, the adhesive 60 is sticky and can fix the soldering ribbon 30 to the battery cell 20.

[0046] Optionally, adhesives 60 may be provided at multiple locations along the length direction of the soldering ribbon 30 , so as to firmly fix the soldering ribbon 30 to the battery cell 20 .

[0047] S400 , welding the welding ribbon 30 , the battery cell 20 and the bus bar 50 to form a battery string array.

[0048] refer to Figure 4 and Figure 5 In step S400 , the busbars 50 between adjacent battery string modules 40 are respectively welded to the welding strips 30 at the ends of the multiple battery strings 410 on both sides to form a battery string array including multiple battery string modules 40 and busbars 50 .

[0049] S500, placing a back adhesive film and a back plate on the battery string array to form a laminated component.

[0050] In this step, the battery string array including the plurality of battery string modules 40 and busbars 50 is placed on the adhesive film and the back plate to form a laminated component. Specifically, the adhesive film and the back plate can be placed on the solder ribbon 30 using a clamp and / or a suction cup.

[0051] The adhesive film may be placed on the soldering ribbon 30 first, and then the back plate may be placed on the adhesive film. The adhesive film and the back plate may also be placed on the soldering ribbon 30 together; that is, the adhesive film and the back plate may be formed into a combined component first, and then placed on the soldering ribbon 30 together. The specific method of placing the adhesive film and the back plate on the soldering ribbon 30 is not limited here.

[0052] The adhesive film includes one or more of EVA, POE, EPE, and PVB. In this way, EVA film is cheap and has high light transmittance. POE film has good water vapor barrier effect and anti-PID effect. EPE film takes into account the advantages of EVA film and POE film, which is conducive to sealing components, improving the quality of components, and reducing costs. PVB film has higher penetration resistance and better safety performance.

[0053] The back sheet includes, for example, one or more of tempered glass, organic glass, and aluminum alloy TPT composite film. In this way, the back sheet can protect and support the cell 20, has reliable insulation, water resistance, and aging resistance, and is conducive to improving the reliability of the back contact photovoltaic module.

[0054] S600 , laminating the components to be laminated, and welding the welding ribbons 30 and the battery cells 20 during lamination.

[0055] Specifically, in this step, the above-mentioned laminated parts are stacked with the front adhesive film and the front plate and then laminated, and the welding ribbon 30 and the battery cell 20 are welded during lamination. Optionally, the laminated parts can be laminated using a single-chamber lamination process, and the welding ribbon 30 and the battery cell 20 are welded during lamination; the laminated parts can also be laminated using a double-chamber lamination process, and the welding ribbon 30 and the battery cell 20 are welded during lamination. The specific method of lamination is not limited here.

[0056] The front film includes, for example, one or more of EVA, POE, EPE, and PVB. Thus, EVA film is cheap and has high light transmittance. POE film has good water vapor barrier effect and anti-PID effect. EPE film takes into account the advantages of EVA film and POE film, which is conducive to sealing components, improving the quality of components, and reducing costs. PVB film has higher penetration resistance and better safety performance.

[0057] The front plate may be inorganic glass. For example, the front plate is ultra-white glass. Ultra-white glass has high light transmittance, high transparency, and excellent physical, mechanical and optical properties. The light transmittance of ultra-white glass can reach more than 92%, and the battery cell 20 can be protected without affecting the efficiency of the battery cell 20 as much as possible.

[0058] The preparation method of the back-contact photovoltaic module proposed in the present application, on the one hand, arranges the battery array by adsorbing and fixing the back-contact battery cells, instead of directly setting the battery cells 20 on the pre-heat-compounded front plate and front film assembly, omitting the use of release film protection, and there is no need to use pre-lamination equipment to pre-laminate the front plate and front film assembly in advance, thereby reducing the risk of lamination bubbles and reduced peel strength, making the process simpler and easier to adsorb to ensure the flatness of the battery cells 20 and reduce the risk of placement deviation of the welding ribbon 30; on the other hand, the welding ribbon 30 and the battery cell 20 are welded during lamination, so there is no need to weld multiple battery cells 20 into a battery string 410 before lamination, thereby avoiding the warping of the battery string 410 caused by the string welding process and reducing the risk of hidden cracks and fragments of the battery cell 20.

[0059] In the present application, the prepared back-contact photovoltaic modules can be used in photovoltaic power stations, such as ground power stations, rooftop power stations, water power stations, etc., and can also be used in equipment or devices that use solar energy to generate electricity, such as user solar power supplies, solar street lights, solar cars, solar buildings, etc. Of course, it can be understood that the application scenarios of optical back-contact photovoltaic modules are not limited to this, that is, back-contact photovoltaic modules can be used in all fields that require the use of solar energy to generate electricity.

[0060] In some embodiments, step S100, placing and fixing the battery cell 20 on a platform 10 with an adsorption function, includes: placing a plurality of battery strings 410 in sequence, wherein a plurality of battery cells 20 in the same battery string 410 are placed on the platform 10 at the same time.

[0061] refer to Figure 3 and Figure 4 When placing the battery cells 20, multiple battery cells 20 in the same battery string 410 are placed at predetermined positions at the same time, so that only one alignment adjustment is required and multiple placements are not required.

[0062] Optionally, when the vacuum adsorption hole 120 adsorbs the battery cell 20 , the vacuum adsorption hole 120 is configured to achieve unit control of the battery string 410 . Unit control of the battery string 410 refers to: synchronously adsorbing multiple battery cells 20 in the battery string 410 .

[0063] Exemplarily, each battery string 410 is adsorbed through a batch of vacuum adsorption holes 120, and the batch of vacuum adsorption holes 120 are controlled by the same vacuum suction control pipeline. Different battery strings 410 correspond to different vacuum suction control pipelines. By analogy, the adsorption of each battery string 410 is controlled by an independent vacuum suction pipeline. In this way, the corresponding vacuum adsorption pipeline can be opened when the battery string 410 is to be placed, thereby reducing costs.

[0064] Optionally, the vacuum adsorption holes 120 are configured to control the battery cell 20 individually. Exemplarily, each battery cell 20 in the same battery string 410 has a group of vacuum adsorption holes 120, which is called a vacuum adsorption hole combination. Different battery cells 20 correspond to different vacuum adsorption hole combinations. The same vacuum adsorption hole combination is controlled by the same vacuum suction control pipeline. In this way, the adsorption and fixing effect of a single battery cell 20 can be easily adjusted.

[0065] Furthermore, when placing the battery cells 20, each battery cell 20 in each battery string 410 is placed at the predetermined position at the same time. That is, on the basis of placing multiple battery cells 20 in the same battery string 410 at the predetermined position at the same time, the above operation is performed on all battery strings 410 simultaneously.

[0066] In some embodiments, placing the soldering ribbon 30 on the adsorbed battery cell 20 includes: placing a plurality of soldering ribbons 30 on each battery string 410 in sequence and at the same time.

[0067] Optionally, for each battery string 410, a clamp can be used to clamp and carry multiple welding ribbons 30 required for the battery string 410, so that when placing the welding ribbon 30, only one alignment adjustment with the battery string 410 is required, and the position accuracy of the welding ribbon 30 can be improved, which can improve the welding accuracy and production efficiency and reduce production costs. Furthermore, the clamp can be used to place all the welding ribbons 30 to be connected at their respective positions.

[0068] In some embodiments, the soldering ribbon 30 and the battery cell 20 are fixed with the adhesive 60 , including: applying glue to the soldering ribbon 30 with a UV inkjet process and curing it simultaneously to form a plurality of glue dots 610 .

[0069] refer to Figure 5 and Figure 6 The adhesive 60 is specifically UV glue. The UV inkjet machine includes a UV lamp for curing. The UV inkjet machine is used to apply glue to the soldering strip 30 and cure it at the same time, thereby improving the fixing efficiency.

[0070] Further, the number of glue points 610 on each solder ribbon 30 is 2-20. When applying glue, glue is applied at least at two positions of each solder ribbon 30 along the length direction of the solder ribbon 30 and cured simultaneously. In this way, the solder ribbon 30 is firmly bonded to the battery cell 20. Exemplarily, the number of glue points 610 can be 2, 5, 7, 9, 10, 12, 13, 14, 17, 20.

[0071] Furthermore, the width of the glue point 610 is greater than the width of the soldering strip 30. In this way, in the width direction of the soldering strip 30, the UV glue can completely cover the soldering strip 30, thereby firmly bonding the soldering strip 30. Specifically in the present application, the width direction of the soldering strip 30 is along the second direction Y.

[0072] Exemplarily, the width of the soldering ribbon 30 is 0.3-0.6 mm. The width of the glue dot 610 is 0.8-2 mm. Specifically, the width of the soldering ribbon 30 is 0.3 mm, 0.35 mm, 0.4 mm, 0.5 mm, 0.6 mm. The width of the glue dot 610 can be 0.8 mm, 0.85 mm, 0.1 mm, 0.15 mm, 0.18 mm, 0.2 mm.

[0073] In this way, by controlling the width of the soldering ribbon 30 and the width of the glue point 610 within a suitable range, on the one hand, when applying glue to the soldering ribbon 30 using a UV inkjet machine, the amount of glue at each application position can be controlled while ensuring that the soldering ribbon 30 is firmly connected, thereby reducing costs; on the other hand, the width of the soldering ribbon 30 can be compatible with the lamination welding process.

[0074] refer to Figure 5 and Figure 7 In some embodiments, the soldering ribbon 30 and the battery cell 20 are fixed with an adhesive 60 , including: providing a reflective film 620 on the soldering ribbon 30 , with the reflective surface of the reflective film 620 facing the battery cell 20 .

[0075] In this embodiment, the adhesive 60 is specifically a reflective film 620. The reflective film 620 fixes the welding tape 30 to the cell 20, and at the same time, the reflective film 620 is used to reflect the light incident on the back plate to the cell 20, thereby improving the utilization rate of the back contact photovoltaic module for light and ensuring the power generation efficiency of the back contact photovoltaic module.

[0076] Exemplary, reference Figure 8 The reflective film strip 620 includes a reflective area 621 in the middle and two transparent areas 622 located on both sides of the reflective layer. The reflective area 621 covers the welding strip 30, and the transparent areas 622 on both sides are adhered to the battery cells 20 on both sides of the welding strip 30.

[0077] Optionally, the length of the reflective film strip 620 is equal to the length of the welding strip 30. The width of the reflective area 621 is greater than the width of the welding strip 30. Exemplarily, the width of the welding strip 30 is 0.3-0.6 mm; the width of the reflective area 621 is 0.8-1.2 mm. Specifically, the width of the reflective area 621 is 0.8 mm, 0.9 mm, 1 mm, 1.2 mm.

[0078] Optionally, the surface of the transparent area 622 is covered with a pressure-sensitive adhesive, and can be adhered to the battery cells 20 on both sides of the soldering ribbon 30 by pressing or hot pressing. The pressure-sensitive adhesive can also be other types of adhesive.

[0079] Exemplarily, the reflective film tape 620 comprises a substrate and a reflective layer stacked in sequence. A bonding layer is disposed on the surface of the substrate facing away from the reflective layer.

[0080] In some embodiments, a Teflon coating is provided on the adsorption surface 110 of the platform 10. The surface of the platform 10 is Teflon treated to prevent damage to the battery membrane surface. The Teflon coating is specifically located between adjacent vacuum adsorption holes 120.

[0081] In some embodiments, after the step of welding the welding ribbon 30, the battery cell 20 and the bus bar 50 to form a battery string array, and before the step of placing a back adhesive film and a back panel on the battery string array to form a laminated component, it also includes: placing the battery string array on a front panel with a front adhesive film.

[0082] Specifically, before executing step S500, the battery string array is first placed on the front plate with the front adhesive film. Optionally, the front adhesive film is laid on the front plate, and the two are not thermally laminated. Optionally, the front adhesive film is laid on the front plate, and the two can also be thermally laminated to form an assembly. Specifically, the front adhesive film and the front plate can be thermally laminated by one or more of a lamination process, an infrared heating process, a microwave heating process, a hot air heating process, a baking tray heating process, and a hot roller heating process.

[0083] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0084] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A method for preparing a back contact photovoltaic module, characterized in that: Includes steps: Place the battery sheet on a platform with adsorption function and fix it by adsorption; Place a solder ribbon on the adsorbed battery cell; Fixing the soldering ribbon and the battery cell by using an adhesive; Welding the welding ribbon, the battery sheet and the bus bar to form a battery string array; Placing a backing film and a back plate on the battery string array to form a laminated part; The components to be laminated are laminated, and the welding ribbons and the battery cells are welded during the lamination.

2. The method for preparing a back contact photovoltaic module according to claim 1, characterized in that: Placing and fixing the battery cells on a platform with an adsorption function includes: placing a plurality of battery strings in sequence, wherein a plurality of battery cells in the same battery string are placed on the platform at the same time.

3. The method for preparing a back-contact photovoltaic module according to claim 1 or 2, characterized in that: Placing a soldering ribbon on the adsorbed battery cell includes: placing a plurality of soldering ribbons on each battery string in sequence at the same time.

4. The method for preparing a back contact photovoltaic module according to claim 1, characterized in that: The soldering strip and the battery cell are fixed by using an adhesive, which includes: applying glue to the soldering strip by using a UV inkjet process and curing it simultaneously to form a plurality of glue points.

5. The method for preparing a back contact photovoltaic module according to claim 4, characterized in that: The number of glue dots on each solder ribbon is 2-20.

6. The method for preparing a back contact photovoltaic module according to claim 4, characterized in that: The width of the glue point is greater than the width of the welding strip.

7. The method for preparing a back contact photovoltaic module according to claim 4, characterized in that: The width of the glue dots is 0.8mm-2mm.

8. The method for preparing a back contact photovoltaic module according to claim 1, characterized in that: The soldering tape and the battery cell are fixed by using an adhesive, comprising: arranging a reflective film tape on the soldering tape, wherein the reflective surface of the reflective film tape faces the battery cell.

9. The method for preparing a back contact photovoltaic module according to claim 1, characterized in that: The adsorption surface of the platform is provided with a Teflon coating.

10. The method for preparing a back contact photovoltaic module according to claim 1, characterized in that: After the step of welding the welding ribbon, the battery cell and the bus bar to form a battery string array, and before the step of placing a back adhesive film and a back plate on the battery string array to form a laminated component, it also includes: placing the battery string array on a front plate with a front adhesive film.

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