TW200906613A - A production formulation for a packaging film for solar cell - Google Patents

Abstract

The present invention relates to a production formulation for a packaging film for solar cell. By forming a film using an EVA resin composition, the packaging EVA film (ethylene-vinyl acetate copolymer resin) contains: 0.01%-5% by weight of an ultraviolet ray absorber (to stable the polymer resin and prevent aging), 0.01%-5% by weight of light stabilizer (to increase the resin quality), 1%-7% by weight of antioxidant (to prevent resin from oxidation), 0.5%-6% by weight of peroxide material (to promote solidification), 0.5%-5% by weight of cross-linking agent (solidification agent, solidification of resin bond strength and durability), 0.5%-7.5% by weight of first coupling agent (resin bonding) and 0.5%-5% by weight of second coupling agent (resin bonding), and then resin is added to the mix as 100%. The embossed surface of the packaging EVA film does not stick to each other and to glass. By selecting the lamination temperature, lamination pressure and lamination time, the inside of the packaging body is characterized as being moisture impervious so that the packaging time for the photovoltaic component can be reduced. This can increase production and durability and reduce manufacturing cost.

Description

200906613 IX. Description of the Invention: [Technical Field of the Invention] The present invention relates to a packaging film applied to a solar cell panel (cell pane 1) and its unique process. [Prior Art] According to the voltage of a single solar cell of about 0.5 V, it can be designed according to the required voltage and current. Usually, several solar cells are connected in series with a metal lead wire, and the EVA is strengthened by low iron in the order of layer stacking. The solar cell body EVA, TPT/TPE will be packaged in the front glass, back plastic or glass substrate by special chemical material sealing device into the laminating machine, and finally protected by the frame to become the solar photovoltaic module. Or template (Photovoltaic Module, PV Module). At present, the most commonly used solar cell material is crystallization stone ' 'hard wafer (si wa er) key (Ingot) after cleaning and cutting, etching, polishing and cleaning, surface structuring, diffusion, money carving, coating and sintering, That is, it becomes a solar cell (so 1 ar cell). The solar cells are usually soldered and connected in series, and then stacked with a packaging material such as EVA (ethylene-vinyl acetate vinegar copolymer), Ted 1 ar and low iron tempered glass, and placed in a laminating machine ( Laminator) is vacuum-packed on the stage to make solar photovoltaic modules or templates. The key technologies for solar cell stencil packaging include: light transmission and Pr i smat ic Structure, and the reliability and durability of the package are the most critical, among which Direct contact with EVA packaging film and solar cell, back film and glass 200906613 glass substrate has become one of the key factors affecting the success or failure of component packaging; then stacking EVA with glass, wafer and other materials into the laminating machine Vacuuming and complete fitting. However, in the packaging manufacturing of solar modules, if there is a gap in each contact surface, and the poor weather resistance of the substrate and the EVA packaging film, it is more likely to cause moisture or air intrusion to form electrical resistance damage under a long time and reduce the work of the entire photovoltaic module. effectiveness. In view of the above, the above-mentioned prior art is lacking, and the present invention proposes a high-performance EVA encapsulating film applied to a solar panel and its unique process to solve the defects existing in the prior art. SUMMARY OF THE INVENTION The main object of the present invention is to pass through an EVA encapsulating film (ethylene-vinyl acetate copolymer), which is composed of 0.01%-5% UV absorber, 0.1%-5% light stabilizer, 1 %-7°/〇 antioxidant, 0.5%-6% peroxide, 5%.5%-5% bridging agent, 0.5%-7.5% first coupling agent and 0.5%-5% first The coupling agent is finally mixed with the resin to a 100% co-composition. Another object of the present invention is to pass through an EVA encapsulating film (ethylene-vinyl acetate copolymer), which has superior properties such as high light transmittance and adhesion between the cured substrate and the substrate. It is still as high as 91% to 92%, and it is not easy to cause yellowing due to ultraviolet radiation. In addition, high mechanical strength also enhances the high durability of the solar cell string and the glass plate or the back film, plus high physical insulation. Avoid solar energy 6 200906613 The battery strings are in contact with each other and highly electrically insulated to protect the solar cell string from short circuit. In addition, it has physical protection to avoid damage caused by climate and environmental changes. Finally, it has high photothermal stability, except for the peeling. It can help dissipate the heat generated by the operation of solar cells. For the above purposes, the EVA encapsulating film (ethylene-vinyl acetate copolymer) of the present invention has an embossed surface which is not self-adhesive and does not adhere to a clean glass surface; It can improve the ease of use in assembly and reduce the air coating during lamination vacuuming. When the cross-linking curing reaction is fast, it is shorter before the molten EVA (ethylene-vinyl acetate vinegar copolymer) is cured. The time flows to a narrower range. Conversely, the crosslinking reaction is slow, and the molten EV A (ethylene-vinyl acetate copolymer) has a longer time to flow to a wider range before curing, and it is possible to cover On the outer edge of the glass plate, cutting is carried out to control the temperature, pressure and time to improve the yield and reduce the cost. [Embodiment] When a semiconductor is irradiated with sunlight, a large amount of free electrons accompany it, and the movement of this electron generates a current, that is, a potential difference is generated at the P N junction. Therefore, 'the solar cell needs sunlight to operate, so most of the solar cells are connected in series with the battery, and the electric energy generated when there is sunlight is stored first, so that it can be used for discharge without sunlight; the domestic solar cell manufacturer will use the solar moon b The battery is called a wafer. After the wafer (or after the wafer is cut by the current required by the design), the foil strip is soldered and then a plurality of soldered wafers are connected in series by a foil strip, and then copolymerized with EVA (ethylene-vinyl acetate). (1), edlar and low-iron tempered glass layers are stacked on the machine of the laminating machine (1(10)inate) for vacuum packaging, and the module (piane/panelM# is a module or solar panel). A number of solar panels are formed into a square array (array array), coupled with a charge and discharge protection control (c〇ntr〇1 ler) and a deep (cycle) discharge battery (lead calcium) and a reverse converter (inverter DC converted to alternating current) It is collectively referred to as a solar power system, also known as a solar power station. The invention is applied to a solar module encapsulation film that passes through a package film EVA 'where the encapsulation film EVA (ethylene Vinyl acetate vinegar copolymer) is composed of 0.01%_5% UV absorber (stabilized polymer tree, anti-aging), 0.1%_5% light stabilizer (improving resin quality), 1%-7% Antioxidant (prevents resin oxidation), 0.50/0-6% peroxide (curing promotion), 5%.5%_5% bridging agent (curing accelerator, solidified tree sap strength and sputum), G series. 5% of the coupling agent (resin adapter promoted) and 0.5% to 5% of the second coupling agent (the wax is subsequently promoted), and finally the resin is mixed to 1% by weight. The invention is applied to the solar component package. The use of the film through 200906613 can achieve better results through the following processes: (A) Wear clean plastic gloves, handle glass plates, encapsulating film EVA (ethylene-vinyl acetate copolymer), and PV (Photovoltaic Module , PV Module) assembly operation of the solar photovoltaic module; (B) with a self-adhesive packaging film EVA (ethylene-vinyl acetate copolymer); outward facing side, taking an angle of about 45 to 60 degrees Lay on the clean, clean glass plate from side to side; (C) Check if there is a large air bubble trapped in the middle of the EVA glass interface of the encapsulation film, if there is a slight adjustment to make the bubbles disappear; (D) Laying the solar cell stack, (E) then placing the other encapsulating film EVA on the outward side, Take about 45 to 60 degrees from one side to the other, laying on the solar cell stack; and (F) finally put the TPT or TPE on the laminate and put it into the laminator for packaging. Assembly of the module layer stack. Moreover, the surface embossing of the encapsulating film EVA (ethylene-vinyl acetate copolymer) is not self-adhesive, and does not stick to the clean glass surface, wherein the step (F) You can use any of the following methods: (1). One-Step, One-Temp Method, set the temperature of the laminator to 145 degrees Celsius to 150 degrees left 9 200906613 Right, vacuum (vacuum) speed is fast, about 3 to 5 minutes to prevent bubble generation; press (lamination) and cross-linking curing (2) in 8 minutes. The completion method (One-Step, Tw〇-Te is Method), the laminator temperature is set at About 110 degrees Celsius to 120 degrees Celsius, after vacuuming for about 3 to 5 minutes, the temperature is programmed to be heated to about 145 degrees Celsius; lamination and curing are completed within 8 minutes (curing) It is also possible to use a one-step three-stage temperature completion method to divide the temperature into three stages, and gradually adjust the 6Q degree, 120 degree and 145 degrees, so that the bubble trap condition can be reduced more. (3) Two-stage two-step method, the laminator temperature is set at about 110 degrees Celsius to 120 degrees Celsius, after vacuuming for about 3 to 5 minutes, the module is again Place the oven in the oven at 145 degrees Celsius to 150 degrees for about 20 to 25 minutes, and slowly complete the encapsulation and curing action of the cross-linking to reduce the generation of bubbles. It is also possible to set the initial temperature of the laminator to about 145 degrees Celsius, and shorten the total time of placing, vacuuming and laminating to 6 minutes to reduce the generation of bubbles. The encapsulating film EVA (ethylene) - the best state of the vinyl acetate copolymer) is to draw a vacuum in 30 seconds before reaching a dissolved state of 65 degrees, and less than one atmosphere, the faster the speed, 10 200906613 the lower the pressure, the better, with the present invention The encapsulation film EVA achieves the best results. Regardless of which of the above methods is used, the degree of cross-linking curing of the encapsulating film EVA (ethylene-vinyl acetate vinegar copolymer) should be examined, and

The adhesion strength of the glass plate, such as the use of TPT as the back film, should also determine the adhesion strength of TPT and EVA, to adjust the optimum temperature, pressure and time to determine the lamination program, or a thermocouple wire (thermocouple wire) The encapsulating film EVA (ethylene-vinyl acetate copolymer) on the glass plate was directly measured to facilitate manual or automatic adjustment of the set temperature, vacuuming and lamination time to achieve the best package tightness. However, the above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto; therefore, the simple equivalent changes and modifications made in accordance with the scope of the present invention and the contents of the description of the present invention All should remain within the scope of the invention patent. [Simple description of the diagram] None [Key component symbol description] 11

Claims (1)

200906613 X. Shen Qing Patent Range: 1. A solar cell encapsulating film formulation comprising: an encapsulating film EVA (ethylene-vinyl acetate copolymer), which is composed of 〇·01%_5% of an ultraviolet absorber, 0.1%-5% light stabilizer, 1%-7% antioxidant, 5%.5%-6% peroxide, 〇.5%_5% bridging agent, 0.5%_7.5% first The coupling agent is mixed with 〇·5%_5% of the first coupling agent' and finally introduced into the resin to 100%. 2. A solar cell encapsulation process comprising: (Α) wearing clean plastic gloves, treating the glass plate, sealing the film EVA (ethylene-vinyl acetate copolymer), and PV (Ph〇) T〇v〇ltaic Module, PV Module) assembly operation of the solar photovoltaic module; (B) with the self-adhesive packaging film EVA (ethylene-acetate acetonitrile 3 曰 shared compound), the outward side, take the contract ^ degrees to (10) degrees from - edge to the other side, laid on the freshly clean, clean glass plate; (c) k depending on whether there is a large air bubble trapped in the middle of the glass film interface of the encapsulation film Make adjustments to make the bubbles disappear; (D) Lay the solar battery pack; (E) Pick up the other piece for the ρA to seal the EVA, and the outward side, take the angle of about 45 to 60 degrees. Sound you __, true β monthly to the other side, laid on the solar battery; and 12 200906613 CF) Finally put the TPT or TPE, put it into the laminator (Laminate) for packaging, complete the module layer Assembly of the pile. 3. The packaging film process recipe for a solar panel according to claim 2 or 2, wherein the surface embossing of the packaging film EVA (ethylene-acetate acetonitrile vinegar) is not self-adhesive It does not stick to the clean glass surface. 4. The package film process recipe for a solar panel according to claim 2, wherein the step (F) can be performed by a one-step method (One-Step, One-Temp Method). The machine temperature is set at 145 degrees Celsius to 150 degrees Celsius, the vacuum speed is fast, about 3 to 5 minutes to prevent bubbles; the press is completed in 8 minutes for lamination and cross-linking. Curing method 5. The solar cell encapsulating film process recipe according to claim 2, wherein the step (F) can be performed by a two-step temperature element method (One-Step, Two- Temp Method), the temperature of the laminator is set at about 110 degrees Celsius to 12 degrees Celsius, and after vacuuming for about 3 to 5 minutes, the temperature is programmed to be heated to about 145 degrees Celsius; in 8 minutes. Finishing (iaminati〇n) and cross-linking curing (curing). 6 · According to the solar cell panel seal 13 200906613 of the patent application scope, the 2009-0613 film preparation process formula, wherein the temperature can be divided into three stages by using the one-step three-stage temperature completion method, (10) degrees, 12 degrees. With 145 degrees kks week, this will reduce the occurrence of bubble sag. 7. The package film process recipe for a solar panel according to claim 2, wherein the step (F) can be set in a two-stage two-stage method (the two-stage method) About 110 to 120 degrees Celsius, after vacuuming for about 3 to 5 minutes, put the module into the oven at 145 degrees Celsius to 15 degrees Celsius for about 20 to 25 minutes, slowly completing the crosslinking curing. The encapsulation action to reduce the generation of bubbles. 8 'According to the packaging film process recipe of the solar panel according to claim 7, wherein the initial temperature of the laminator is set at about 145 degrees Celsius, and is placed, vacuumed and laminated. The whole process is shortened to 6 minutes to reduce the generation of bubbles. 9. The package process recipe for a solar panel according to claim 1 or 2, wherein the optimum condition of the encapsulation film EVA (ethylene-vinyl acetate copolymer) is at 65 degrees. Before the dissolved state, the vacuum is drawn within 30 seconds, and less than - atmospheric pressure, the faster the speed, the lower the pressure is better. 14 200906613 VII. Designated representative map: (1) The representative representative of the case is: ( ). (2) A brief description of the symbol of the representative figure: Yi / V'N VIII. If there is a chemical formula in this case, please disclose the chemical formula that best shows the characteristics of the invention: