Photovoltaic packaging method based on light-cured organic silica gel and light-cured butyl rubber

Abstract

The invention relates to the technical field of photovoltaic packaging, and discloses a photovoltaic packaging method based on light-cured organic silica gel and light-cured butyl rubber, which comprises the following steps: S1, arranging a box dam on a bottom plate, and coating a first layer of organic silicon rubber in the box dam; s2, a photovoltaic cell is placed on the first layer of organic silicon rubber, the photovoltaic cell is coated with a second layer of organic silicon rubber, and the organic silicon rubber is of a photo-curing type; s3, the outer layer of the box dam is coated with a circle of butyl rubber, and the butyl rubber is of a photocuring type; s4, the box dam is removed, and the butyl rubber makes contact with the organic silicon rubber; s5, carrying out light curing treatment on the butyl rubber, the first layer of organic silicon rubber and the second layer of organic silicon rubber until semi-curing; and S6, after the semi-cured butyl rubber is covered with a top plate, the secondary light curing treatment colloid is completely cured. Therefore, the problem that the quality of a photovoltaic module is affected due to the fact that the sealing performance and the waterproof performance of an existing optical module are insufficient after packaging is completed is solved.

Description

Technical Field

[0001] The invention relates to the technical field of photovoltaic encapsulation, and in particular to a photovoltaic encapsulation method based on photocurable organic silica gel and photocurable butyl rubber. Background Art

[0002] Photovoltaic encapsulation refers to the technology of sealing and assembling photovoltaic cells into photovoltaic modules through specific materials and processes to protect photovoltaic cells from the influence of the external environment, so as to better utilize solar energy for photovoltaic power generation and ensure the long-term stable operation of photovoltaic cells. The main purpose of photovoltaic encapsulation is to prevent moisture, oxygen and other impurities from entering the interior of the photovoltaic module, thereby protecting photovoltaic cells from damage and extending their service life.

[0003] In the existing photovoltaic packaging process, EVA (ethylene-vinyl acetate copolymer) or POE (polyolefin elastomer) is generally used as the packaging material of photovoltaic modules, that is, EVA glue or POE glue is used to seal the photovoltaic cell between two transparent plates, so as to protect the photovoltaic cell in the middle without affecting the absorption and conversion of light energy by the photovoltaic cell. However, in actual use, it is found that there are certain problems in the application of EVA and POE in photovoltaic packaging: EVA has poor aging resistance, especially in a hot and humid environment, EVA will generate acetic acid through hydrolysis reaction, thereby corroding the surface of the photovoltaic module and inducing PID effect, and EVA is very easy to yellow when used outdoors, thereby reducing the power generation efficiency. However, the synthesis process of POE is complicated, and the chemical polarity of POE is relatively low. It is necessary to add polar auxiliary solvents to realize processing operations. Polar auxiliary solvents are very easy to precipitate on the surface of the film, which makes the surface of the film too smooth and causes the displacement of the device. It also causes hanging materials at the film lips and damages the processing equipment, which ultimately affects the photoelectric conversion rate of photovoltaic modules and reduces the power generation efficiency of photovoltaic modules. Based on this, the prior art proposes new packaging materials for photovoltaic packaging. For example, the patent with application number: 202311523597.3 proposes to improve the light transmittance of photovoltaic modules by liquid silicone rubber and improve the waterproof performance of photovoltaic modules by butyl rubber, so as to achieve the dual effects of improving the power generation efficiency of photovoltaic modules and extending the service life of photovoltaic modules. However, the patent records that the heat-cured organic liquid silicone rubber and the heat-cured butyl rubber are packaged together. This packaging method results in a gap between the organic silicone rubber and the butyl rubber after curing. Even if the gap is very small, it will cause a lack of glue at the edge of the colloid, resulting in a loose bond between the organic silicone rubber and the butyl rubber, reducing the waterproof and vapor-proof function of the butyl rubber, resulting in external water vapor entering the glue layer and contacting the photovoltaic cell after long-term use, affecting the normal operation of the photovoltaic cell.

[0004] Therefore, how to improve the sealing and waterproof properties of photovoltaic modules in the photovoltaic packaging step is an important issue that needs to be urgently solved in the photovoltaic packaging field. Summary of the invention

[0005] The present invention aims to provide a photovoltaic encapsulation method based on photocurable organic silicone rubber and photocurable butyl rubber, so as to solve the problem that the existing optical components have insufficient sealing and waterproof properties after encapsulation, which affects the quality of photovoltaic components.

[0006] To achieve the above object, the present invention adopts the following technical solution: a photovoltaic encapsulation method based on light-curing organic silica gel and light-curing butyl rubber, comprising the following steps:

[0007] S1, setting a circle of dam on the bottom plate, and applying the first layer of silicone rubber in the dam;

[0008] S2, placing a photovoltaic cell on the first layer of organic silicone rubber, and coating a second layer of organic silicone rubber on the photovoltaic cell, wherein both the first layer of organic silicone rubber and the second layer of organic silicone rubber are photocurable organic silicone rubber;

[0009] S3, coating a circle of butyl rubber on the outer layer of the dam, controlling the height of the butyl rubber to exceed the top surface of the second layer of silicone rubber, and the butyl rubber is a light-curing butyl rubber;

[0010] S4, removing the dam so that the butyl rubber of the outer ring is in contact with the outer periphery of the first layer of silicone rubber and the outer periphery of the second layer of silicone rubber;

[0011] S5, performing light curing treatment on the butyl rubber, the first layer of organic silicone rubber, and the second layer of organic silicone rubber until all of the three are in a semi-cured state;

[0012] S6, after the semi-cured butyl rubber is covered with the top plate, a second light curing treatment is performed until the butyl rubber and the silicone rubber are completely cured and the encapsulation is completed.

[0013] The beneficial effects of this solution are as follows: 1. Both butyl rubber and silicone rubber are photocurable, and a photocatalytic environment can be used to cure the colloid after the glue coating step is completed, so that the liquid silicone rubber and the fluid butyl rubber can be fused with each other before being photocured, thereby solving the problem of small gaps between the two types of glues that are difficult to avoid when non-photocurable colloids are cured; the two colloids can fully fuse and penetrate each other in a fluid state, and the contact positions of the edges of the colloids can be combined. After curing, the original gaps can be completely eliminated, thereby solving the problem of insufficient sealing and waterproofing of existing optical components after packaging, which affects the quality of photovoltaic components.

[0014] 2. The photocurable silicone rubber and the photocurable butyl rubber can complete the curing operation of the colloid without the need for heating treatment, completely avoiding the adverse effects of high temperature on the photovoltaic cell circuit during the existing colloid curing process using heating, further improving the protection of the photovoltaic cell, and better improving the performance of the resulting photovoltaic module products.

[0015] 3. After the dam is removed, the butyl rubber on the outer ring will immediately come into direct contact and fuse with the silicone rubber in the middle, further avoiding the need in the prior art to pre-cure each adhesive layer by heating and control the colloid to stop flowing before coating the outer ring waterproof layer. There is a gap between the semi-solid adhesive layer and the outer waterproof ring that is difficult to eliminate. The gap causes a lack of glue at the edge of the colloid, resulting in a loose bond between the silicone rubber and the butyl rubber, which results in a poor waterproof sealing effect of the butyl rubber coated around the photovoltaic module, reducing the waterproof performance of the butyl rubber.

[0016] 4. Through the chemical double bonds inside butyl rubber and silicone rubber, a polymerization reaction is further generated between the two colloids, and finally a cured product with a cross-linked structure is produced, which then tightly combines the edges of the two to continuously form a tight bonding boundary to eliminate the gap between the two colloids after molding, thereby improving the tightness of the connection structure of the two colloids and further ensuring the performance of the photovoltaic cell after encapsulation.

[0017] Preferably, in S1, the dam is any one of a mold frame and a viscose-molded dam.

[0018] Preferably, in S2, after coating the first layer of organic silicone rubber, the first layer of organic silicone rubber is scraped and then the photovoltaic cell is placed.

[0019] Preferably, after coating the second layer of organic silicone rubber, the second layer of organic silicone rubber is subjected to a scraping treatment.

[0020] Preferably, in S5, during the light curing process, a light curing machine is used to provide a UV light source, and the UV light source treatment time is 10 seconds, and the energy of the UV light source is 1800 mJ / cm 2 , the wavelength of the UV light source is 365nm.

[0021] Preferably, in the light curing process of S6, the treatment time of the UV light source is 60 seconds, and the energy of the UV light source is 1800-5000 mJ / cm 2 , the wavelength of the UV light source is 365nm.

[0022] Preferably, before coating, the first layer of organic silicone rubber, the second layer of organic silicone rubber and the butyl rubber are all subjected to vacuum degassing treatment.

[0023] Preferably, when the dam is a mold frame, the mold frame is removed by pulling it out upward; during the process of pulling the mold frame upward, the bottom of the butyl rubber ring first contacts and fuses with the bottom of the first layer of silicone rubber, and then gradually the middle of the butyl rubber ring contacts and fuses with the connection between the first layer of silicone rubber and the second layer of silicone rubber, and finally the top of the butyl rubber contacts and fuses with the second layer of silicone rubber until the mold frame is pulled out.

[0024] The beneficial effects of this solution are as follows: during the extraction process, the bottom of the mold frame is gradually exposed, thereby forming a space between the bottom of the mold frame, the inner wall of the butyl rubber and the outer wall of the silicone rubber. Since both the butyl rubber and the silicone rubber are bonded to the bottom glass, the interior of the formed space is a negative pressure environment, which in turn gives the liquid silicone rubber and the fluid butyl rubber a driving force to approach each other, so that the two colloids are in contact and fused as soon as the mold frame is extracted, thereby ensuring that the gap between the silicone rubber and the butyl rubber can be completely eliminated; at the same time, the mold frame continues to be extracted upward, and the top of the space is still sealed, so that air will not enter the interior of the negative pressure space, which can not only further avoid the generation of bubbles inside the colloid, but also further improve the tightness of the connection between the butyl rubber ring and the silicone rubber. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the packaging method in an embodiment of the present invention;

[0026] Figure 2 Schematic diagram of the chemical process of the addition reaction of organic silicone rubber in an embodiment of the present invention. DETAILED DESCRIPTION

[0027] The following is further described in detail through specific implementation methods:

[0028] Example

[0029] The embodiment is basically as shown in the attached Figure 1-2 As shown, Figure 1 The photovoltaic encapsulation method based on photocurable organic silicone and photocurable butyl adhesive is shown. Aiming at the shortcomings of the products obtained by the current traditional photovoltaic module encapsulation method in terms of sealing and waterproofness, a new encapsulation operation step is designed according to the characteristics of the sealing adhesive material, so as to ensure that there is no gap at the connection between the colloids after molding, so as to improve the sealing and waterproof performance of the photovoltaic module product obtained after the final encapsulation is completed, and achieve the purpose of increasing the service life of the photovoltaic module product and the photoelectric conversion efficiency.

[0030] The specific steps include:

[0031] S1, set a circle of dam on the bottom plate, and apply the first layer of silicone rubber in the dam.

[0032] Photovoltaic module products mainly include a base plate, a top plate and photovoltaic cells fixed between the top plate and the base plate by a sealing adhesive layer. The base plate and the top plate are made of transparent glass plates to ensure that the photovoltaic cells inside them can better absorb light energy. The sealing adhesive layer, the top plate and the base plate also protect the circuit of the photovoltaic cell to prevent it from being disturbed by the external environment, thereby ensuring the normal operation of the photovoltaic cell and continuously converting light energy into electrical energy.

[0033] In this solution, a circle of dam is first set on the bottom plate, and the dam is used as the location of the sealing adhesive layer coating and the restriction of the colloid flow. The shape of the dam needs to be customized according to the production requirements of the photovoltaic module products. In this embodiment, the dam is specifically a rectangular frame sealed on all sides. The dam can be selected from any one of the mold frame or the viscose-molded dam. When the mold frame is selected as the dam, the material of the mold frame is selected as a metal with a certain weight, so that the mold frame can fit with the bottom plate glass under its own gravity to avoid the colloid from flowing out after the liquid colloid is applied. When the viscose-molded dam is selected, a 3M tape with a certain thickness can be used to bond the circle on the bottom plate glass. It should be noted that according to the requirements of different photovoltaic module products, the height of the mold frame or the viscose-molded dam should be set to be greater than the height of the sealing adhesive layer to avoid the glue layer from flowing out, and the thickness of the dam is set to be less than 3mm. The dam in this embodiment is a mold frame.

[0034] Next, the first layer of silicone rubber is applied in the mold frame dam. The first layer of silicone rubber is in liquid state. The coating method is to spray the liquid silicone rubber quantitatively in the middle of the mold frame through a spray gun. Due to the tension of the self-generated surface of the colloid, the fluidity of the colloid-like silicone rubber liquid is relatively low. After coating, the first layer of silicone rubber is scraped with a scraper to make the overall thickness of the first layer of silicone rubber uniform and the surface smoother, so as to avoid the problem that the sealed photovoltaic cell is in a tilted state due to the uneven overall thickness of the first layer of silicone rubber, affecting its absorption efficiency of light energy, and the contact surface between the photovoltaic cell and the first layer of silicone rubber due to the uneven surface of the first layer of silicone rubber. When the photovoltaic module is used outdoors for a long time, the bubbles will gradually expand due to the influence of light and the normal operation of the photovoltaic cell, and eventually form a delamination or leakage channel, which seriously affects the performance of the module, reduces the light transmittance of the entire photovoltaic module, affects the photoelectric conversion efficiency, and increases the maintenance cost.

[0035] In this step, silicone rubber is selected as the sealing adhesive layer material of the photovoltaic module. While the silicone rubber meets the physical and chemical properties required as a photovoltaic module packaging material, such as high light transmittance, yellowing resistance, good adhesion, low shrinkage, and good weather resistance, the chemical properties of the silicone rubber are highly stable and will not produce acid by-products like EVA, which can effectively reduce the possibility of the PID effect.

[0036] In addition, the silicone rubber selected in this scheme is a light-cured addition-type silicone rubber, that is, the silicone rubber can be cured under photocatalytic conditions. No low-molecular substances are produced in the curing process of the addition-type silicone rubber, and the curing conditions mainly depend on the light treatment conditions. Compared with ordinary silicone rubber, whose curing conditions also depend on the humidity in the environment, it has obvious advantages, especially in deep curing, where the performance of the addition-type silicone rubber is obviously better. In addition, the addition-type silicone rubber is superior to ordinary silicone rubber in terms of the final strength and bonding performance of the product, and when used as the sealing bonding layer of photovoltaic modules, it can better ensure the stability of the overall structure of the product.

[0037] S2, placing a photovoltaic cell on the first layer of silicone rubber, and coating a second layer of silicone rubber on the photovoltaic cell.

[0038] The photovoltaic cell is placed flat on the uniform and flat first layer of silicone rubber after the scraping treatment, and the liquid first layer of silicone rubber is bonded to the bottom edge of the photovoltaic cell; then, a liquid second layer of silicone rubber is coated on the photovoltaic cell, and the coating method of the second layer of silicone rubber is the same as that of the first layer of silicone rubber, and the second layer of silicone rubber and the first layer of silicone rubber are the same light-curing addition-type liquid silicone rubber. After coating, the upper and lower layers of silicone rubber seal and wrap the entire photovoltaic cell, that is, the photovoltaic cell is sealed as a whole in the light-curing addition-type silicone rubber, thereby achieving fixed bonding and sealing protection of the photovoltaic cell.

[0039] Then, the second layer of silicone rubber is treated with the same scraping glue treatment method to make the thickness uniform and the surface flat. The second layer of silicone rubber will be bonded to the top glass. The flat surface after the scraping glue treatment can better bond with the second layer of silicone rubber, thereby further reducing the possibility of bubbles in the photovoltaic module and improving the performance of the photovoltaic module product. The uniform thickness is also to ensure that the photovoltaic cell will not tilt after the encapsulation is completed. In addition, the uniformity of the thickness and the flatness of the surface of the second layer of silicone rubber can be achieved by coating first and scraping glue later. In the entire silicone rubber coating process, the spraying tool and the scraper can be prevented from directly contacting the photovoltaic cell, thereby avoiding the possibility of scratching and position shifting of the photovoltaic cell due to operational errors. It should also be noted that in this embodiment, the first layer of silicone rubber and the second layer of silicone rubber are both subjected to vacuum degassing treatment before coating to ensure that the coated liquid silicone rubber raw material will not have bubbles inside, further improving the quality and light conversion performance of the photovoltaic module product.

[0040] S3, coating a circle of butyl rubber on the outer layer of the dam, controlling the height of the butyl rubber to exceed the second layer of silicone rubber, and the butyl rubber is a light-curing butyl rubber.

[0041] Although photocurable addition-type silicone rubber has many advantages in meeting the needs of adhesive sealant layers for photovoltaic module encapsulation, silicone rubber has poor waterproof performance. If only silicone rubber is selected as the sealing adhesive layer in the photovoltaic module, although it can improve the light transmittance of the photovoltaic module, it has the defect of easy water seepage. After water seepage, not only will the light transmittance of the photovoltaic module be reduced, but the water vapor will also cause irreversible damage to the photovoltaic cells between the sealing adhesive layers, thereby reducing the service life of the photovoltaic module.

[0042] Based on this, in this step, a circle of butyl rubber is applied on the outer layer of the dam. Butyl rubber is a natural waterproof material with excellent waterproof performance. Therefore, after adding a circle of butyl rubber around the first layer of silicone rubber and the second layer of silicone rubber, the high-efficiency waterproof performance of butyl rubber can be used to make up for the weak waterproof performance of silicone rubber as a sealing adhesive layer of photovoltaic modules.

[0043] The height of the butyl rubber coating is controlled to slightly exceed the top surface of the second layer of silicone rubber to ensure that when the top plate glass is covered, the butyl rubber of the outer ring can completely seal the space between the top plate and the bottom plate, thereby improving the sealing adhesive layer formed by the internal silicone rubber and the waterproof effect of the photovoltaic cell, and avoiding the occurrence of waterproof loopholes due to the exposure of the silicone rubber due to the butyl rubber not being in contact with a certain part of the top plate or the bottom plate, which affects the quality of the final photovoltaic module and reduces its life. In addition, the butyl rubber is coated by hot melt gluing, and the butyl rubber is also vacuum degassed before coating. The vacuum degassed treatment of the colloid is a prior art and will not be repeated in this embodiment. Since the butyl rubber from the glue is very viscous and fluid as a whole, and the butyl rubber is not heated at this time, the fluid butyl rubber of the outer ring will hardly flow without setting a blocking structure after coating, which can ensure the integrity of the overall waterproof ring structure.

[0044] In addition, the butyl rubber in this step is a photocurable butyl rubber, which can also be cured under photocatalytic conditions. The butyl rubber and silicone rubber are both photocurable, so that the curing of the colloid can be achieved by using the photocatalytic environment after the glue coating step is completed, and the curing operation of the colloid can be completed without heating treatment, completely avoiding the adverse effects of high temperature on the photovoltaic cell circuit during the existing heating method to achieve colloid curing, further improving the protection of the photovoltaic cell, and better improving the performance of the resulting photovoltaic module product.

[0045] S4, remove the dam so that the butyl rubber of the outer ring is in contact with the outer periphery of the first layer of silicone rubber and the outer periphery of the second layer of silicone rubber.

[0046] After the glue coating is completed, the mold frame used as the dam is removed. The mold frame is removed by pulling it upwards. During the upward pulling process: the bottom of the butyl rubber ring first contacts and fuses with the bottom of the first layer of silicone rubber, then the middle of the butyl rubber ring gradually contacts and fuses with the connection between the first layer of silicone rubber and the second layer of silicone rubber, and finally the top of the butyl rubber contacts and fuses with the second layer of silicone rubber until the mold frame is pulled out. During the pulling process, the bottom of the mold frame is gradually exposed, so a space is formed between the bottom of the mold frame, the inner wall of the butyl rubber and the outer wall of the silicone rubber. Since both the butyl rubber and the silicone rubber are bonded to the bottom glass, the space formed is a negative pressure environment, which gives the liquid silicone rubber and the fluid butyl rubber a force to approach each other, so that the two colloids contact and fuse as soon as the mold frame is pulled out, ensuring that the gap between the silicone rubber and the butyl rubber can be completely eliminated. At the same time, the mold frame continues to be pulled upward, and the top of the space remains sealed, so that no air enters the negative pressure space, which not only further avoids the formation of bubbles inside the colloid, but also further improves the tightness of the connection between the butyl rubber ring and the silicone rubber.

[0047] S5, performing photocuring treatment on the butyl rubber, the first layer of silicone rubber, and the second layer of silicone rubber until all of them are in a semi-cured state.

[0048] After the mold frame is removed, the fluid butyl rubber and the liquid first layer of silicone rubber and the second layer of silicone rubber are fused together at the joints. Since both colloids are light-curing, a light-curing device can be used to perform photocatalysis to semi-cure them. In this embodiment, the light-curing device is a UV-300 curing machine, which emits UV beams (i.e., ultraviolet rays) to induce photocatalytic chemical reactions in the colloids, thereby achieving curing.

[0049] In the existing photovoltaic packaging process, when adding a waterproof ring to improve the waterproof performance of the entire photovoltaic module, the method adopted is: pre-curing each adhesive layer by heating, controlling the colloid to stop flowing, and then coating the outer waterproof layer. However, this treatment has defects, because even if the internal sealing adhesive layer can be controlled to be in a semi-solid state during the heating pre-curing process to ensure its adhesion, when the waterproof ring is coated on the periphery of the semi-solid adhesive layer, there will still be a gap between the two that is difficult to eliminate. The existence of this small gap will cause the edge of the colloid to lack glue, resulting in a loose bond between the organic silica gel and the butyl rubber, resulting in a poor waterproof sealing effect of the butyl rubber coated around the photovoltaic module, reducing the waterproof performance of the butyl rubber.

[0050] In the present embodiment, the flow of the liquid silicone rubber in the middle is first restricted by means of a mold frame, and then fluid butyl rubber is coated around it. The mold frame is then removed upwards to allow the liquid silicone rubber and the fluid butyl rubber to directly fuse with each other and then undergo a photocuring treatment. This ensures that there is no gap between the sealing adhesive layer in the middle of the resulting photovoltaic module and the waterproof layer of the outer ring, and ultimately a complete packaging component can be obtained, thereby improving the sealing performance of the overall structure.

[0051] In addition, the photocurable addition type silicone rubber contains chemical double bonds, and is cured under the action of UV light source and photocatalyst mixed into the colloid. In this embodiment, the photocatalyst is platinum, which has good chemical stability, good high temperature oxidation resistance, and low reaction activity, and will not cause harm. The process of the addition reaction of silicone rubber curing is as follows Figure 2 As shown, the curing process does not release heat and no low molecular by-products are released; in addition, the overall shrinkage of the colloid during curing is small. After curing, the colloid becomes a soft and transparent elastomer, which can maintain elasticity for a long time within the temperature range of -65-200°C. It has the advantages of excellent electrical properties and chemical stability, water resistance, ozone resistance, radiation resistance, weathering resistance, hydrophobicity and moisture resistance, good low compression deformation, low flammability and shock resistance.

[0052] Similarly, light-cured butyl rubber also contains chemical double bonds. The chemical formula of butyl rubber is:

[0053] CH2=C(CH3)-CH=CH2

[0054] Because the connection between butyl rubber and silicone rubber is fused with each other, under the catalytic action of photocatalyst and UV light source, the photocatalyst inside the colloid is rapidly decomposed into cations to trigger polymerization reaction of unsaturated organic compounds, and then cross-linking reaction between monomer molecules is triggered, that is, the double bonds between the two will further produce polymerization reaction, and finally produce a cured product with cross-linking structure. Then the edges of the two are tightly combined to continuously form a tight bonding boundary, so as to eliminate the gap between the two colloids after molding, and further improve the tightness of the connection structure of the two colloids.

[0055] In addition, in the semi-curing treatment of this step, the UV light source treats the colloid for 10 seconds, and the treatment energy of the UV light source is 1800mJ / cm 2 , the wavelength of the UV light source is set to 365nm. By controlling the light source treatment intensity, time and other conditions, the polymerization reaction can be effectively regulated and promoted to achieve accurate control of the chemical reaction.

[0056] S6, after the top plate is covered on the semi-cured butyl rubber, a second light curing treatment is performed until the butyl rubber and the silicone rubber are completely cured and the encapsulation is completed.

[0057] After the estimated curing treatment, the butyl rubber and the second layer of silicone rubber still have a certain degree of stickiness. At this time, the top glass cover is connected to the butyl rubber and the second layer of silicone rubber for bonding and fixing. The various components of the photovoltaic module are assembled. Then, the photovoltaic module is further treated with UV light source using a light curing device to complete the complete curing of the colloid, and the packaging is completed.

[0058] In this step, the UV light source treatment time during the light curing treatment is 60s, and the energy of the UV light source is 1800-5000mJ / cm 2 , the wavelength of the UV light source is set to 365nm. The full curing still uses the light curing treatment method, which can also complete the curing process without increasing the colloid temperature, further avoiding the performance of the photovoltaic cell being affected by temperature during the packaging process.

[0059] The photovoltaic encapsulation method provided in this solution is based on the stability of the photocurable silicone rubber and the waterproof performance of the photocurable butyl rubber to achieve efficient protection of the photovoltaic cells inside the photovoltaic module, thereby ensuring that the photovoltaic cells can work in an environment that is isolated from external moisture, transparent and extremely stable, so as to ensure their working efficiency and service life, and improve the quality of the entire photovoltaic module product.

[0060] Then, the photo-curing properties of the two colloids are further utilized for photocatalytic curing, which completely changes the traditional heating curing method, and realizes the fusion of liquid silicone rubber and fluid butyl rubber before photo-curing, solving the problem of small gaps between the two colloids that are difficult to avoid when curing non-photocuring colloids; the two colloids in the fluid state can fully fuse and penetrate each other, realize the combination of the contact position of the colloid edge, and completely eliminate the original gap after curing, solving the problem that the contact edge of the two colloids of the existing non-photocuring type is difficult to avoid due to the pre-curing treatment, resulting in a small gap between the two colloids. In addition, not using heating treatment can completely avoid the risk of circuit damage to photovoltaic cells due to the heating of the colloid.

[0061] Finally, the chemical double bonds inside the butyl rubber and silicone rubber further produce a polymerization reaction under the catalytic action of the photocatalyst and UV light source, and finally produce a cured product with a cross-linked structure, which then tightly combines the edges of the two to continuously form a tight bonding boundary, thereby improving the tightness of the connection structure of the two colloids and further ensuring the performance of the photovoltaic cell after encapsulation.

[0062] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A photovoltaic encapsulation method based on light-curing organic silica gel and light-curing butyl rubber, characterized in that: The following steps are involved: S1, setting a circle of dam on the bottom plate, and applying the first layer of silicone rubber in the dam; S2, placing a photovoltaic cell on the first layer of organic silicone rubber, and coating a second layer of organic silicone rubber on the photovoltaic cell, wherein both the first layer of organic silicone rubber and the second layer of organic silicone rubber are photocurable organic silicone rubber; S3, coating a circle of butyl rubber on the outer layer of the dam, controlling the height of the butyl rubber to exceed the top surface of the second layer of silicone rubber, and the butyl rubber is a light-curing butyl rubber; S4, removing the dam so that the butyl rubber of the outer ring is in contact with the outer periphery of the first layer of silicone rubber and the outer periphery of the second layer of silicone rubber; S5, performing light curing treatment on the butyl rubber, the first layer of organic silicone rubber, and the second layer of organic silicone rubber until all of the three are in a semi-cured state; S6, after the semi-cured butyl rubber is covered with the top plate, a second light curing treatment is performed until the butyl rubber and the silicone rubber are completely cured and the encapsulation is completed.

2. The photovoltaic encapsulation method based on photocurable organic silica gel and photocurable butyl rubber according to claim 1, characterized in that: In S1, the dam is any one of a mold frame and a viscose-molded dam.

3. The photovoltaic encapsulation method based on light-curing organic silica gel and light-curing butyl rubber according to claim 2, characterized in that: In S2, after coating the first layer of silicone rubber, the first layer of silicone rubber is scraped and then the photovoltaic cell is placed.

4. The photovoltaic encapsulation method based on light-curing organic silica gel and light-curing butyl rubber according to claim 3, characterized in that: After coating the second layer of organic silicone rubber, the second layer of organic silicone rubber is subjected to scraping treatment.

5. The photovoltaic encapsulation method based on light-curing organic silica gel and light-curing butyl rubber according to claim 4, characterized in that: In S5, during the light curing treatment, a light curing machine is used to provide a UV light source, and the UV light source treatment time is 10 seconds, the energy of the UV light source is 1800 mJ / cm2, and the wavelength of the UV light source is 365 nm.

6. The photovoltaic encapsulation method based on light-curing organic silica gel and light-curing butyl rubber according to claim 5, characterized in that: In the light curing process of S6, the treatment time of the UV light source is 60s, the energy of the UV light source is 1800-5000mJ / cm2, and the wavelength of the UV light source is 365nm.

7. The photovoltaic encapsulation method based on light-curing organic silica gel and light-curing butyl rubber according to claim 6, characterized in that: Before coating, the first layer of silicone rubber, the second layer of silicone rubber and the butyl rubber are all subjected to vacuum degassing treatment.

8. The photovoltaic encapsulation method based on light-curing organic silica gel and light-curing butyl rubber according to claim 2, characterized in that: When the surrounding dam is a mold frame, the mold frame is removed by pulling it out upwards; During the process of pulling the mold frame upward, the bottom of the butyl rubber ring first contacts and fuses with the bottom of the first layer of silicone rubber, then gradually the middle of the butyl rubber ring contacts and fuses with the connection between the first layer of silicone rubber and the second layer of silicone rubber, and finally the top of the butyl rubber contacts and fuses with the second layer of silicone rubber until the mold frame is pulled away.

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