Photovoltaic module lamination curing process and lamination curing production line

Abstract

The invention aims to provide a photovoltaic module laminating and curing process and a laminating and curing production line aiming at the defects of long production period and low production efficiency of a laminating machine and a laminating process in the prior art, and the photovoltaic module laminating and curing production line comprises a degassing unit, a laminating and curing unit and a transmission unit, the degassing unit is used for heating and pressurizing the photovoltaic module in a vacuum environment so as to remove bubbles generated when the adhesive is melted and gas reserved between layers of the photovoltaic module, and the photovoltaic module lamination curing process comprises a degassing stage, a pre-curing stage and a curing stage. The degassing stage, the pre-curing stage and the curing stage are sequentially completed in the degassing cavity, the pre-curing cavity and the curing cavity respectively, by the adoption of the photovoltaic module lamination curing process and the lamination curing production line of the structure, pre-crosslinking and pre-curing are completed in the pre-curing cavity, crosslinking and curing are completed in the curing cavity, the process time can be reasonably distributed, and the production efficiency is improved. The lamination curing time is integrally shortened, and the production takt is improved.

Description

Technical Field

[0001] The invention relates to the technical field of photovoltaic component lamination, and in particular to a photovoltaic component lamination curing process and a lamination curing production line. Background Art

[0002] Photovoltaic modules usually include a substrate, a cover plate and a cell. The cell is arranged between the substrate and the cover plate. Adhesive glue or glue is arranged between the cell and the substrate and the cover plate to bond the substrate, the cell and the cover plate. The commonly used adhesive material is EVA glue wax. In order to firmly bond the substrate, the cover plate and the cell together, a laminator is used for heating and pressing. At the same time, the bubbles between the layers and the gas released by the glue during the curing process are removed.

[0003] At present, the lamination process of photovoltaic modules is as follows: after the photovoltaic modules are transferred to the laminator, they are first degassed in a vacuum environment, which is called the degassed stage, and then heated and pressurized in a vacuum environment to cure the glue, which is called the lamination curing stage. In the degassed stage, the photovoltaic modules are heated to reach a melted state, and the lamination chamber of the laminated photovoltaic modules is evacuated. The heating, vacuuming and pressurization are performed while exhausting until the bubbles generated after the glue melts and the bubbles between the layers are basically emptied, and the degassing is completed. The process time is generally 4-6 minutes; in the lamination curing stage, the vacuum state is maintained, and heating and pressurization are applied. The layers are pressed together after heating and pressurization are applied to the curing temperature of the adhesive and the pressure is maintained. The curing time varies according to the different adhesives. The general lamination time is about 10-25 minutes. Therefore, the total lamination time of the photovoltaic module is 14-30 minutes. The degassing and lamination curing of photovoltaic modules can be completed in the same chamber or in two different chambers. When completed in two different chambers, degassing is completed in one chamber and lamination curing is completed in the second chamber. The vacuuming and pressurization in the degassing stage are mainly to remove the bubbles between the layers. The vacuuming in the lamination curing stage is mainly to remove the bubbles that have not been removed and prevent the residual gas in the lamination chamber from entering between the layers. The vacuum lamination curing time is relatively long when two chambers are used for lamination. The vacuum degassing needs to wait for the lamination process, which makes the whole process slow and the whole production efficiency low. If the same chamber is used for lamination, the whole lamination time will be longer, which will further reduce the production efficiency. Summary of the invention

[0004] The purpose of the present invention is to provide a photovoltaic module lamination and curing process and a lamination and curing production line to address the shortcomings of the prior art laminators and lamination processes, such as long production cycle and low production efficiency.

[0005] The technical solution of the present invention to solve the technical problem is as follows: A photovoltaic module lamination and curing production line comprises a degassing unit, a lamination and curing unit and a transmission unit, wherein the degassing unit is used to heat and pressurize the photovoltaic module under a vacuum environment to remove bubbles generated when the adhesive melts and gas retained between layers of the photovoltaic module, and the lamination and curing unit comprises a pre-curing unit and a curing unit, wherein the degassing unit, the pre-curing unit and the curing unit are arranged in sequence front to back, the pre-curing unit is used to provide a vacuum environment for the photovoltaic module and heat the photovoltaic module to make the adhesive pre-bond and pre-cured and remove the gas remaining in the photovoltaic module by pressurization, the curing unit is used to heat the photovoltaic module to make the adhesive bond, the photovoltaic module degassed by the degassing unit is transmitted to the pre-curing unit by the transmission unit, the photovoltaic module pre-bonded and pre-cured in the pre-curing unit is transmitted to the curing unit, and the photovoltaic module bonded and cured in the curing unit is transmitted out; The degassing unit and the pre-curing unit respectively include a laminating device, and the laminating device includes an upper box, a pressure component, a pressure component driving device, a workbench and a photovoltaic module heating device. The upper box is located above the workbench, and can be driven by an external force to move up and down to adjust the distance between the upper box and the workbench. The pressure component is located between the upper box and the workbench. The pressure component driving device is fixed by the upper box, and its output end is fixedly connected to the upper surface of the pressure component. The lower surface of the pressure component is opposite to the workbench. The upper box can move up and down under the drive of an external force. When the upper box descends to the point where it is aligned with the workbench, the pressure component driving device is fixed by the upper box. After closing, the upper box and the workbench are connected by a sealing assembly to form the sealed cavity. A connecting structure for connecting with a vacuum device and an inflating device is provided on the sealed cavity. When the sealed cavity is used for a degassing unit, it is called a degassing cavity. When it is used for a precuring unit, it is called a precuring cavity. The curing unit includes an upper box and a workbench. The upper box can move up and down under the drive of an external force. When it meets the workbench, it forms a closed cavity, which constitutes a curing cavity. Heating devices for heating the photovoltaic module are respectively provided in the degassing cavity, the precuring cavity, and the curing cavity. The curing cavity is a sealed cavity. The curing unit includes more than two curing chambers, each of which is arranged up and down to form a stacked structure, and a lifting and transmission device is arranged between the pre-curing unit and the curing unit, and the photovoltaic components transmitted from the pre-curing unit are transmitted to the curing chambers located at different layer heights through the lifting and transmission device; The upper box of the curing chamber located at the lower layer is fixedly connected to or integrally arranged with the workbench of the curing chamber located thereon; A feeding unit is provided before the degassing unit, and the feeding unit is provided with a heating device, which can heat the photovoltaic module and transmit the heated photovoltaic module to the degassing unit; The feeding unit comprises a hot air chamber composed of a feeding conveying platform and an upper box, the hot air chamber is sealed and connected with the degassing chamber through a hot air circulation device, the hot air circulation device can collect the residual heat in the degassing chamber and transport it to the heat sealing chamber, and then the gas after the heat sealing chamber is cooled is returned to the degassing chamber; A cooling unit is arranged behind the curing unit, and a lifting and conveying device is arranged between the two. The conveying components of the lifting and conveying device can rise or fall to receive photovoltaic components in curing chambers at different levels and convey them to the cooling unit.

[0006] A photovoltaic module lamination curing process includes a degassing stage, a pre-curing stage and a curing stage, wherein the degassing stage, the pre-curing stage and the curing stage are respectively completed in a degassing chamber, a pre-curing chamber and a curing chamber in sequence. In the degassing stage: in the degassing chamber, the photovoltaic module is heated while vacuuming, and the temperature is greater than or equal to the bonding temperature of the adhesive and lower than the curing temperature of the adhesive, until the adhesive melts and the vacuum degree reaches the process requirements, the photovoltaic module is pressurized to remove bubbles generated during the melting of the adhesive and gas between the layers of the photovoltaic module, so that the adhesive completes the initial bonding; In the pre-curing stage: the degassed photovoltaic module is heated to the curing temperature of the adhesive in a vacuum environment in the pre-curing chamber and kept warm, and pressurized while heating and keeping warm, so that the adhesive reaches pre-bonding and pre-curing, and at the same time, bubbles generated by the curing reaction of the adhesive are removed; In the curing stage: the pre-cured photovoltaic module is heated up in the curing chamber until it reaches a temperature higher than the curing temperature of the adhesive and then kept warm, so that the module is cured without pressure; The pressurized pressure in the degassing stage and the pre-curing stage is greater than 0 and less than or equal to 1 atmosphere, and / or the heating rate in the pre-curing stage and the curing stage is 10-20 degrees Celsius per minute, the heating rate in the degassing stage is less than 10 degrees Celsius per minute, and / or the process time in the pre-curing stage is equal to the process time in the degassing stage, and the process time in the curing stage is an integer multiple of the process time in the degassing stage; During the photovoltaic module loading and transmission stage, the photovoltaic modules are heated and heated to reach the pre-melting temperature of the photovoltaic modules, and then enter the degassing stage, and / or multiple curing chambers are set in the curing stage, and each curing chamber is arranged up and down, and the photovoltaic modules of the same batch after pre-curing are transported to a curing chamber located at a certain height through a lifting and transmission device for curing, and photovoltaic modules of different batches are transported to curing chambers at different laminations for curing; and / or the cured photovoltaic modules are transported to the cooling unit through the lifting and transmission device.

[0007] The advantages and beneficial effects of the present invention are: The photovoltaic module lamination and curing production line adopting the structure of the present invention divides the original lamination and curing unit into a pre-curing unit and a curing unit. The pre-curing unit and the curing unit have a pre-curing cavity and a curing cavity respectively. The components complete pre-gluing and pre-curing in the pre-curing cavity, and complete gluing and curing in the curing cavity. Therefore, the process time can be reasonably allocated, the lamination and curing time is shortened as a whole, and the production rhythm is improved.

[0008] The lamination process using the structure of the present invention divides the lamination curing stage of the prior art into two pre-curing stages and a curing stage. The pre-curing stage completes the pre-bonding and pre-curing of the adhesive, and removes the gas in the component by pressurizing. The curing stage completes the bonding and curing of the adhesive, and the pre-curing and bonding curing stages are completed in the pre-curing chamber and the bonding curing chamber respectively. Therefore, the process time of vacuum degassing and pre-curing can be matched by increasing the number of workstations in the bonding curing stage, so that the time the component stays in the degassing chamber, the pre-curing chamber and the bonding curing chamber is coordinated, thereby speeding up the rhythm of the component entering and exiting the lamination production line. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a schematic structural diagram of an embodiment of a lamination production line of the present invention; Figure 2 It is a structural schematic diagram of another embodiment of the lamination production line of the present invention; Figure 3 This is a schematic diagram of the structure of a stacked curing unit embodiment of the present invention; Figure 4 It is a schematic structural diagram of a laminating device embodiment; Figure 5 It is a process curve diagram of temperature and time of the lamination process of the lamination production process of the present invention.

[0010] Description of Reference Numerals 100-loading unit; 200-degassing unit; 300-pre-curing unit; 400-lifting and transmission unit 1; 500-curing unit; 501-glue curing chamber 600-lifting and transmission unit 2; 700-Cooling unit; 1-Laminating device 11-Pressure component; 12-Pressure component driving device; 14-Upper box; 15-Workbench; 16-Working chamber; 17-Sealing cover DETAILED DESCRIPTION

[0011] The present invention is further described in detail below through specific examples. The following examples are only illustrative and not restrictive, and the protection scope of the present invention cannot be limited thereto.

[0012] In the present invention, the following method is used to laminate and solidify the photovoltaic module: the photovoltaic module is laminated and solidified in stages, as follows: a. Degassing stage: First, the photovoltaic module is sent into the degassing chamber, and the photovoltaic module is heated while vacuuming, and heated to a temperature greater than or equal to the bonding temperature of the adhesive and lower than the curing temperature of the adhesive, so that the adhesive melts. After the vacuum degree reaches the process requirements, the photovoltaic module is pressurized until the process pressure is reached. The main purpose of this stage is to melt the adhesive, complete the initial bonding, and squeeze out the bubbles generated during the melting of the adhesive and the bubbles that stay between the layers; the time required is T1.

[0013] b. Pre-curing stage: The photovoltaic modules are sent from the degassing chamber to the pre-curing chamber and heated to the curing temperature under vacuum environment so that the adhesive reaches pre-bonding. The degassed photovoltaic modules are pressurized under vacuum environment. After the heating temperature reaches the curing temperature of the adhesive, the temperature is kept warm and pressurized to the process pressure while heating. The process time T2 is equivalent to the vacuum degassing time T1, and it is best that the two are equal. At this stage, the adhesive completes pre-bonding and pre-curing, and the bubbles generated by the curing reaction of the adhesive bonding are eliminated.

[0014] c. Curing stage: transfer the photovoltaic module from the pre-curing chamber to the bonding curing chamber, and heat it up in a vacuum or non-vacuum environment to complete bonding and curing of the adhesive. The curing time T3 is an integer multiple of the pre-curing stage, that is, T3 is equal to N times T2, that is, T3=NT2, and the heating temperature is greater than the curing temperature of the adhesive. During this process, no pressure is applied and only heating is performed until the lamination curing is completed. Since during this period, the adhesive has reached a temperature above the curing temperature and has formed preliminary curing and bonding in the pre-curing stage, the outside air cannot enter, the gas formed in the bonding curing has been eliminated, and no pressure is applied during this process, only curing, which greatly reduces the time the module is pressurized. The entire module will not become thinner due to continued pressurization, which is conducive to maintaining the thickness of the edges and corners of the module, and can avoid the occurrence of over-pressure rebound at the corners caused by over-pressure of the module after cooling, which can improve the weather resistance of the module. And it does not affect the bonding firmness between the layers of the module.

[0015] By adopting the above method, the lamination curing stage of the prior art is divided into two pre-curing stages and a curing stage. The pre-curing stage completes the pre-gluing and pre-curing of the adhesive, and removes the gas in the component by pressurization. In the curing stage, the gluing and curing of the adhesive are completed, and the pre-curing and gluing curing stages are completed in the pre-curing chamber and the gluing curing chamber respectively. Therefore, the process time of vacuum degassing and pre-curing can be matched by increasing the number of workstations in the gluing curing stage, so that the time the component stays in the degassing chamber, the pre-curing chamber and the gluing curing chamber is coordinated, thereby speeding up the rhythm of the component entering and exiting the lamination production line.

[0016] In order to match the number of workstations in the glue-bonding and curing chambers with the number of workstations in the pre-gluing chamber and the degassing chamber, and to enable the pre-cured laminated components to be transferred out in time to receive new photovoltaic components, the volume of the cross-linking and curing chamber can be increased. The number of workstations for laminated components set in a glue-bonding and curing chamber is N times the number of workstations for laminated components in the degassing chamber. When the next batch of components needs to enter the cross-linking and curing chamber, the cross-linking and curing chamber opens the cover and transfers the components to move the previous batch of components forward and vacate the workstations for the next batch of components. When a new batch of components enters, the cover is closed again to continue curing. Alternatively, N cross-linking and curing chambers are set, and the components are cured in different glue-bonding and curing chambers. It is best to allow the components to enter the stacking device to complete the glue curing during the curing stage. In the stacking device, the number of glue curing chambers depends on the number of workstations of the laminated components in each glue curing chamber 501. When the number of workstations is the same, the number of glue curing chambers is N times the number of degassing chambers. When the number of workstations is less than the number of degassing chambers, the number of glue curing chambers must satisfy the product of the number of glue curing chambers and the number of workstations in each cross-linking curing chamber, which is equal to N times the number of component workstations in the degassing chamber. In this way, the components can be cured in the same cross-linking curing chamber without opening and closing the cover and moving the workpiece during the curing process. The photovoltaic components are transported to the glue curing chambers located at different layer heights by the lifting and transmission mechanism, and are transported out after the lamination curing is completed in the glue curing chamber. In the method of the present invention, the lamination curing is divided into two stages: pre-curing and bonding curing, and the two stages are completed in different cavities. In addition, a stacked lamination curing process is adopted in the curing stage which takes a long time, the pre-bonding of the photovoltaic module is completed in the pre-curing stage, and the bonding curing of the module is completed in the curing stage. Since the pre-curing time is consistent with or equivalent to the vacuum degassing time, and the vacuum degassing and pre-curing time are synchronized, the pre-curing cavity can be entered to complete the pre-bonding and pre-curing of the adhesive without waiting. When the stacked curing method is adopted in the curing stage, A plurality of stacked glue curing chambers are set at one location. When the number of layers of the glue curing chamber is greater than or equal to the number of components required for lamination and curing in a batch, the components complete glue curing in their respective glue curing chambers. When new components are transmitted out, they are connected to the empty glue curing chambers through the lifting mechanism for glue curing. The components that have completed glue curing are transmitted out through the lifting transmission mechanism, and the cycle is repeated. Therefore, the process time will not be prolonged, and the beat of the entire production line can be improved by only adding the plane space of one glue curing chamber, thereby improving the efficiency of the entire lamination production line. With the above process, since the lamination curing is divided into at least two stages, the time that the photovoltaic components occupy the lamination curing chamber in the lamination curing stage is shortened, and can be shortened to be consistent with the vacuum degassing time, so that the beat of the entire production line can be consistent.

[0017] In order to further improve the efficiency of the entire lamination curing production line, the components are preheated at the loading stage before entering the degassing chamber. The preheating temperature is lower than the melting temperature of the film, and it is best to make the film reach a nearly melted state.

[0018] It is best to optimize the preheating and heating rate of the components during the lamination and curing period. During the feeding period, the heating rate of the components should not be too fast. It is best to reach a state of almost melting but not melting before entering the degassing chamber to prevent the adhesive from melting during the feeding period when it reaches the nearly melting state too early. This can further reduce the process time of the degassing stage. In the degassing stage, the temperature is raised in the first half of the time to reach the process temperature, so that the adhesive is initially bonded, and then lamination is performed at the process temperature to initially bond the layers of the components together; at this stage, the heating rate should not be too fast, and reaching the preset process temperature in advance will affect the degassing. After the degassing is completed, lamination is performed, so that the bubbles can be removed more cleanly. The heating rate at this stage is controlled to be less than 10 degrees Celsius per minute. In the pre-crosslinking and pre-curing stage, the heating rate at this stage should be fast, and the process temperature, which is greater than the curing temperature of the adhesive, is reached in the shortest time. The adhesive completes the pressurized pre-bonding at this process temperature. This can prevent external gas from entering the component. In the curing stage, the components need to be heated up quickly to reach the process temperature in the shortest time, so that the components can be glued and cured at this temperature. No pressure is applied in this stage. In the pre-curing stage and the curing stage, the heating rate is preferably 10-20 degrees Celsius per minute. The pressure applied in the degassing stage and the pre-curing stage is greater than 0 atmosphere and less than or equal to 1 atmosphere.

[0019] After lamination and curing, the components enter the cooling lamination and curing stage, and the components that have completed the bonding and curing are cooled down to cool the adhesive after the bonding and curing, and then delivered to the next process after cooling.

[0020] During cooling and solidification, the components are cooled by a workbench equipped with a cooling medium and a pressure plate equipped with a cooling medium. The components are cooled by squeezing the components together with the cooling pressure plate equipped with a cooling medium and the cooling workbench. The purpose of pressurization is to accelerate cooling. Air cooling or a combination of air cooling and pressurized cooling can also be used to cool the components.

[0021] The lamination curing time of the present invention is described in detail below in conjunction with specific embodiments. EVA adhesive film is used as the adhesive.

[0022] In the present invention, the temperature rise of the component in each stage is linear.

[0023] Loading and transport preheating stage: Heat the components during the loading and transport stage. Heat the components to 50-70 degrees Celsius before they enter the degassing chamber. Make the components reach the critical melting temperature and maintain it within 8-15 seconds before being transported to the degassing chamber. This prevents the film from melting before entering the degassing chamber and enables the components to melt as soon as possible after entering the degassing chamber, thereby reducing process time.

[0024] Degassing stage: The total process time of the degassing stage is 4-6 minutes. It takes 2-3 minutes to heat the module to 100-120 degrees Celsius and maintain this temperature during the degassing stage. During this period of time, the vacuum degree in the degassing chamber reaches the process vacuum degree of 50-80 Pa. After the process vacuum degree is reached in the degassing chamber, the module is pressurized for 2-3 minutes. The pressurization pressure is 0.1-0.2MPa. After the process time is reached, the cover is opened and the photovoltaic module is transferred to the pre-curing chamber. Transfer the module to the pre-curing chamber.

[0025] Pre-curing stage: evacuate the pre-curing chamber to maintain the vacuum environment, heat the components to quickly increase the temperature of the components. The principle is that the faster the heating speed, the better. The temperature should be raised from 100-130 degrees to the process temperature of 145-150 degrees in the shortest time, so that the film can be pre-bonded at this temperature; after the components enter the pre-curing chamber, they are continuously pressurized to complete pre-bonding and pre-curing. The process time is 4-6 minutes.

[0026] Curing stage: Transfer the photovoltaic modules from the pre-curing chamber to the bonding curing chamber, and quickly heat up in a vacuum or non-vacuum environment, so that the module temperature quickly rises from 145-150 degrees to 160-170 degrees and maintains it. The bonding curing is completed at this temperature, and the total time is 8-18 minutes.

[0027] Cooling and curing stage: After the glue is cured, it enters the cooling chamber for air cooling and / or is pressurized by the cooling workbench and cooling plate for cooling and curing.

[0028] The photovoltaic modules are preheated before entering the vacuum degassing chamber. After being heated to a temperature close to the melting temperature, they are allowed to enter the vacuum degassing chamber. This can shorten the overall time used for vacuum degassing, thereby shortening the pre-curing time, speeding up the pace of the photovoltaic modules entering and exiting the vacuum degassing chamber and the pre-curing chamber, and improving the lamination and curing efficiency of the entire photovoltaic module production line.

[0029] The production process of the present invention can be implemented by using a photovoltaic module production line having the following structure. The utility model comprises a degassing unit 200, a pre-curing unit 300 and a curing unit 500, which are arranged in front and back in sequence. The degassing unit and the pre-curing unit both comprise a laminating device for heating and pressurizing the photovoltaic module. The laminating device comprises a pressure component, a pressure component driving device, a workbench and an upper box. The photovoltaic module is arranged on the workbench. The pressure component driving device is fixedly supported by the upper box. The pressure component is located in the upper box and between the workbench and the upper box. The pressure component is arranged on the output end of the pressure driving device through one end face thereof, and the other end face of the pressure component faces the workbench. The pressure component can move toward or away from the workbench under the drive of the pressure driving device. The upper box can drive the pressure component and the pressure driving device toward or away from the workbench under the drive of an external force, so as to adjust the distance between the pressure component and the workbench. When moving away from the workbench, the pressure component makes way for the transmission component. When moving toward the workbench, the pressure component is close to the component to reduce the output stroke of the pressure driving device. The upper box and the workbench are not sealed, forming a working chamber 16. A heating device may be provided in the upper box, and / or in the workbench, and / or in the pressure component to provide heat for the assembly. For ease of description, the laminating device used for the degassing unit is referred to as a degassing laminating device, and the laminating device used for the precuring unit is referred to as a precuring laminating device. The degassing unit also includes a sealing component, which is arranged at the lower end of the upper box of the degassing laminating device. When an external force drives the upper box downward, the upper box can be closed by the sealing component and the workbench to form a sealed degassing sealing cavity. The degassing sealing cavity is usually provided with a gas communication structure for communicating with a vacuum device and an inflation device on the upper box, and is interconnected with the vacuum device and the inflation device through the gas communication structure. In this way, the degassing unit can not only heat and pressurize the photovoltaic assembly, but also evacuate or inflate the degassing sealing cavity to complete the vacuum degassing and pre-lamination of the photovoltaic assembly. The lower end of the upper box of the pre-curing unit 300 may or may not be provided with a sealing component. When the pre-curing unit needs to be vacuumed according to process requirements, a sealing component must be provided on the lower end surface of the upper box. When the upper box moves downward, the upper box can be closed together with the workbench through the sealing component to form a sealed cavity, which is called a pre-curing sealed cavity. A second connection structure for connecting with a vacuum device and an inflation device is provided on the pre-curing sealed cavity.

[0030] The curing unit includes a workbench and an upper box. The conveyor belt (not shown in the figure) is arranged around the workbench. The upper box can meet and close with the workbench under the action of its driving device to form a glue-bonded curing chamber. The closing process is called closing the lid, or leaving each other is called opening the lid. A heating device is provided to heat the glue-bonded curing chamber to increase the temperature of the component. The number of workstations in the glue-bonded curing chamber can be N times the number of workstations in the pre-curing unit. In this way, the glue-bonded curing chamber can receive the photovoltaic modules transmitted from each batch of the pre-curing unit in multiple times, and move forward in sections by the conveyor belt. Each movement needs to accommodate the distance of the number of photovoltaic modules, and glue-bonded curing is performed on different batches of photovoltaic modules in the same chamber. More than two glue-bonded curing chambers can also be set. In this way, the process time of the degassing unit can be adapted, so that the number of glue-bonded curing stations is a multiple of the number of degassing glue and pre-curing chamber stations, respectively, so that the process beats of each stage are consistent. Each glue-bonded curing chamber can be arranged in sequence front and back, or multiple glue-bonded curing chambers can be arranged in upper and lower layers to form a stacked structure. The workbench of the glue-bonded curing chamber located on the upper layer and the upper box of the glue-bonded curing chamber located on the lower layer are an integrated structure or fixedly connected. A conveyor belt is arranged around the workbench of each layer to transport photovoltaic modules. When the curing unit adopts a stacked structure, a lifting and transmission unit 400 is arranged between the curing unit and the pre-curing unit, and photovoltaic modules can be transported from the pre-curing unit to the curing chamber of each layer of the curing unit. The lifting and transmission unit is a prior art and will not be described in detail here. A lifting and transmission unit 600 is arranged between the cross-linking curing unit and the cooling and curing unit, and each layer of photovoltaic modules that have been cured can be transported out of the curing unit and into the cooling and curing unit. The cooling and curing unit can also be arranged in a stacked structure. The preferred cooling and curing unit includes a cooling and curing chamber composed of a cooling table and an upper box, and a cooling plate for pressurized cooling of the photovoltaic module. The cooling plate is connected to a cooling plate driving device, and the cooling plate driving device drives the cooling plate to approach or move away from the cooling table. A conveyor belt is arranged around the cooling table. When the photovoltaic module transmits the thermally cured photovoltaic module to the cooling table, the upper box moves up with the cooling plate to make way for the photovoltaic module. When the photovoltaic module is in place, the upper box moves down the cooling plate and the cooling table to cool the photovoltaic module from the upper and lower surfaces of the photovoltaic module. The pressure of the cooling plate does not need to be too large, and it only needs to contact the photovoltaic module. When the cooling unit is a stacked structure, a lifting and transmission unit is arranged behind the cooling unit to transmit the photovoltaic modules stacked on each layer of the cooling unit.

[0031] The loading unit preferably adopts the following structure: a heat box that can move up and down is arranged above the loading platform, and after the heat box moves down, it forms a sealed hot air chamber with the loading and conveying platform, and the hot air chamber is connected to the degassing chamber gas circulation through a hot air circulation device, and the hot air circulation device can collect the residual heat in the degassing chamber and transport it to the heat sealing chamber, and then the gas after the heat sealing chamber is cooled is returned to the degassing chamber. In this way, the residual heat of the degassing chamber can be used to heat the photovoltaic modules on the loading and conveying platform.

Claims

1. A photovoltaic module lamination and curing production line, comprising a degassing unit, a lamination and curing unit and a transmission unit, wherein the degassing unit is used to heat and pressurize the photovoltaic module under a vacuum environment to remove bubbles generated when the adhesive melts and the gas retained between the layers of the photovoltaic module, characterized in that: The lamination curing unit includes a pre-curing unit and a curing unit, which are arranged in front and back order. The pre-curing unit is used to provide a vacuum environment for the photovoltaic module and heat the photovoltaic module to make the adhesive pre-gluing and pre-curing and remove the residual gas in the photovoltaic module by pressurization. The curing unit is used to heat the photovoltaic module to complete the bonding of the adhesive. The photovoltaic module degassed by the degassing unit is transmitted to the pre-curing unit through the transmission unit, the photovoltaic module that has completed pre-gluing and pre-curing in the pre-curing unit is transmitted to the curing unit, and the photovoltaic module that has completed bonding and curing in the curing unit is transmitted out.

2. A photovoltaic module lamination and curing production line as claimed in claim 1, characterized in that: The degassing unit and the pre-curing unit respectively include a laminating device, and the laminating device includes an upper box, a pressure component, a pressure component driving device, a workbench and a photovoltaic module heating device. The upper box is located above the workbench, and can be driven by an external force to move up and down to adjust the distance between the upper box and the workbench. The pressure component is located between the upper box and the workbench. The pressure component driving device is fixed by the upper box, and its output end is fixedly connected to the upper surface of the pressure component. The lower surface of the pressure component is opposite to the workbench. The upper box can move up and down under the drive of an external force. When the upper box descends to the point where it is aligned with the workbench, the pressure component driving device is fixed by the upper box. After closing, the sealed cavity is formed between the upper box and the workbench through the sealing component. A connecting structure for connecting with the vacuum device and the inflation device is arranged on the sealed cavity. When the sealed cavity is used for the degassing unit, it is called a degassing cavity. When it is used for the precuring unit, it is called a precuring cavity. The curing unit includes an upper box and a workbench. The upper box can move up and down under the drive of an external force. When it meets the workbench, it forms a closed cavity, which constitutes a curing cavity. Heating devices for heating the photovoltaic module are respectively arranged in the degassing cavity, the precuring cavity and the curing cavity. The curing cavity is a sealed cavity.

3. A photovoltaic module lamination and curing production line as claimed in claim 2, characterized in that: The curing unit includes more than two curing chambers, each of which is arranged up and down to form a stacked structure. A lifting and transmission device is arranged between the pre-curing unit and the curing unit, and the photovoltaic components transmitted from the pre-curing unit are transmitted to the curing chambers located at different layer heights through the lifting and transmission device.

4. A photovoltaic module lamination and curing production line as claimed in claim 3, characterized in that: The upper box of the curing chamber located at the lower layer is fixedly connected to or integrally arranged with the workbench of the curing chamber located thereon.

5. The photovoltaic module lamination and curing production line according to claim 1, characterized in that: A feeding unit is arranged before the degassing unit. The feeding unit is provided with a heating device, which can heat the photovoltaic module and transmit the heated photovoltaic module to the degassing unit.

6. A photovoltaic module lamination and curing production line as claimed in claim 1, characterized in that: The loading unit includes a hot air chamber composed of a loading transmission platform and an upper box. The hot air chamber is sealed and connected to the degassing chamber through a hot air circulation device. The hot air circulation device can collect the residual heat in the degassing chamber and transport it to the heat sealing chamber, and then the gas after cooling in the heat sealing chamber is returned to the degassing chamber.

7. A photovoltaic module lamination and curing production line as claimed in claim 3, characterized in that: A cooling unit is arranged behind the curing unit, and a lifting and conveying device is arranged between the two. The conveying components of the lifting and conveying device can rise or fall to receive photovoltaic modules in curing chambers at different levels and convey them to the cooling unit.

8. A photovoltaic module lamination curing process, characterized in that: It includes a degassing stage, a pre-curing stage and a curing stage, which are respectively completed in the degassing chamber, the pre-curing chamber and the curing chamber in sequence. In the degassing stage: in the degassing chamber, the photovoltaic module is heated while vacuuming, and the temperature is greater than or equal to the bonding temperature of the adhesive and lower than the curing temperature of the adhesive, until the adhesive melts and the vacuum degree reaches the process requirements, the photovoltaic module is pressurized to remove bubbles generated during the melting of the adhesive and gas between the layers of the photovoltaic module, so that the adhesive completes the initial bonding; In the pre-curing stage: the degassed photovoltaic module is heated to the curing temperature of the adhesive in a vacuum environment in the pre-curing chamber and kept warm, and pressurized while heating and keeping warm, so that the adhesive reaches pre-bonding and pre-curing, and at the same time, bubbles generated by the curing reaction of the adhesive are removed; In the curing stage: the pre-cured photovoltaic module is heated up in the curing chamber until it reaches a temperature higher than the curing temperature of the adhesive and then kept warm, so that the module completes pressure-free curing.

9. A photovoltaic module lamination curing process as claimed in claim 8, characterized in that: The pressurization pressure in the degassing stage and the pre-curing stage is greater than 0 and less than or equal to 1 atmosphere, and / or the heating rate in the pre-curing stage and the curing stage is 10-20 degrees Celsius per minute, the heating rate in the degassing stage is less than 10 degrees Celsius per minute, and / or the process time in the pre-curing stage is equal to the process time in the degassing stage, and the process time in the curing stage is an integer multiple of the process time in the degassing stage.

10. A photovoltaic module lamination curing process as claimed in claim 8 or 9, characterized in that: During the photovoltaic module loading and transmission stage, the photovoltaic modules are heated and heated to reach the pre-melting temperature of the photovoltaic modules, and then enter the degassing stage, and / or multiple curing chambers are set in the curing stage, and each curing chamber is arranged up and down, and the photovoltaic modules of the same batch after pre-curing are transported to a curing chamber located at a certain height through a lifting and transmission device for curing, and photovoltaic modules of different batches are transported to curing chambers at different laminations for curing; and / or the cured photovoltaic modules are transported to the cooling unit through the lifting and transmission device.

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