CN110676335B - Hot-pressing curing method for photovoltaic module and pressing equipment for hot-pressing curing - Google Patents
Hot-pressing curing method for photovoltaic module and pressing equipment for hot-pressing curing Download PDFInfo
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- CN110676335B CN110676335B CN201910948313.2A CN201910948313A CN110676335B CN 110676335 B CN110676335 B CN 110676335B CN 201910948313 A CN201910948313 A CN 201910948313A CN 110676335 B CN110676335 B CN 110676335B
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- 238000003825 pressing Methods 0.000 title claims abstract description 61
- 238000007731 hot pressing Methods 0.000 title claims abstract description 32
- 238000001723 curing Methods 0.000 title abstract description 40
- 238000000034 method Methods 0.000 claims abstract description 39
- 238000010438 heat treatment Methods 0.000 claims abstract description 33
- 239000000853 adhesive Substances 0.000 claims abstract description 26
- 230000001070 adhesive effect Effects 0.000 claims abstract description 26
- 239000000463 material Substances 0.000 claims description 13
- 238000007789 sealing Methods 0.000 claims description 13
- 230000002093 peripheral effect Effects 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 2
- 239000000741 silica gel Substances 0.000 claims description 2
- 229910002027 silica gel Inorganic materials 0.000 claims description 2
- 230000006835 compression Effects 0.000 claims 2
- 238000007906 compression Methods 0.000 claims 2
- 238000004806 packaging method and process Methods 0.000 abstract description 8
- 230000007547 defect Effects 0.000 abstract description 3
- 238000001816 cooling Methods 0.000 description 22
- 238000010030 laminating Methods 0.000 description 11
- 229920000297 Rayon Polymers 0.000 description 7
- 239000012790 adhesive layer Substances 0.000 description 7
- 239000011521 glass Substances 0.000 description 6
- 238000002844 melting Methods 0.000 description 6
- 230000008018 melting Effects 0.000 description 6
- 238000003475 lamination Methods 0.000 description 5
- 239000002390 adhesive tape Substances 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000005485 electric heating Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000005187 foaming Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
- H01L31/042—PV modules or arrays of single PV cells
- H01L31/048—Encapsulation of modules
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/08—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the cooling method
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
- B32B37/1018—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure using only vacuum
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Fluid Mechanics (AREA)
- Photovoltaic Devices (AREA)
Abstract
The invention aims to provide a pressing device and a hot-pressing curing method of a photovoltaic module, aiming at the defects that when the viscosity of an adhesive is high, cavities are easily generated at the corners of the photovoltaic module when the photovoltaic module is packaged by the packaging method and the packaging device of the photovoltaic module in the prior art, so that the performance of the photovoltaic module is affected, the pressing device and the hot-pressing curing method of the photovoltaic module are provided, the laminated member which completes the vacuum heating and pressurizing step is transferred into a second lower cavity, after the cavity of a curing cavity is closed, compressed gas is filled into the second upper cavity, so that the flexible pressing member is pressed against the upper surface of the photovoltaic module to heat and pressurize the photovoltaic module for curing, the method and the device are adopted to heat, pressurize and cure the photovoltaic module, the compressed gas is filled into the upper cavity in a non-vacuum state, the compressed gas applies positive pressure to the flexible pressing member from the upper part of the flexible pressing member, and the adhesive slowly moves when the photovoltaic module is pressed, the edge cavity can be reduced, and the generation of cavities can be reduced.
Description
Technical Field
The invention relates to a hot-press curing method of a photovoltaic module and pressing equipment used for the hot-press curing.
Background
The conventional packaging method comprises the steps of firstly carrying out vacuum hot pressing on the photovoltaic component above the melting temperature of an adhesive layer, then carrying out vacuum hot pressing solidification at the solidification temperature of the adhesive layer, correspondingly, the equipment comprises two vacuum laminating machines which are arranged in front and back, each vacuum laminating machine comprises an upper box and a lower box, the upper box and the lower box are closed to form a sealed cavity, a flexible pressing piece is arranged in the sealed cavity, the flexible pressing piece divides the sealed cavity of the vacuum laminating machine into an upper vacuum chamber and a lower vacuum chamber, the upper vacuum chamber is communicated with the atmosphere, the lower vacuum chamber is used for placing the photovoltaic component, is communicated with a vacuum device and is vacuumized by the vacuum device. In order to remove bubbles in the photovoltaic module, the photovoltaic module is vacuumized by adopting a vacuumizing method in the laminating process and the curing process, but in the vacuumizing process, the temperature of the photovoltaic module reaches the melting temperature of an adhesive layer after hot pressing, so that when the photovoltaic module is subjected to vacuum low-temperature hot pressing, the adhesives at the edges and the corners are easy to flow to extrude the bubbles in the photovoltaic module, the adhesives between the layers of the photovoltaic module are locally reduced, and the reduced adhesives are not complemented due to high viscosity and poor fluidity of adhesives used by some photovoltaic modules, so that a local cavity part is formed, hollow bubbles are generated at the edges and the corners of the module, a foaming structure is formed, quality defects are caused, and the performance of the photovoltaic module is influenced.
Disclosure of Invention
The invention aims to provide a hot-press curing method of a photovoltaic module and pressing equipment used for the hot-press curing, aiming at the defect that when the photovoltaic module is packaged by adopting the packaging method and the packaging equipment of the photovoltaic module in the prior art, cavities are easily generated at the corners of the photovoltaic module when the viscosity of an adhesive is high, so that the performance of the photovoltaic module is affected.
The purpose of the invention is realized by the following technical scheme:
according to the photovoltaic module hot-pressing curing method, a sealing cavity II serving as a curing cavity is divided into an upper cavity II and a lower cavity II which are mutually independent by a flexible pressing piece, the layered piece which is subjected to the vacuum heating and pressurizing step is transferred into the lower cavity II, and after the curing cavity is closed, compressed gas is filled into the upper cavity II, so that the flexible pressing piece is pressed against the upper surface of a photovoltaic module to heat and pressurize the photovoltaic module for curing;
after the cavity is closed, the layered assembly is heated to the curing temperature of the viscose material of the layered assembly, and then compressed gas is filled into the second upper cavity to heat and pressurize the layered assembly;
the pressure of the gas filled into the upper cavity II is 0.01-0.1Mpa, the gas filling time is 4-40 minutes, and the pressure is applied for 5-15 minutes after gas filling;
the layered assembly is a photovoltaic assembly;
the photovoltaic module is a roof tile module, the adhesive is PTU or POE, the curing temperature is 155-;
and sealing the peripheral edges of the laminated assembly in an airtight manner before heating, pressurizing and curing.
A pressing device for hot-pressing curing of a photovoltaic module comprises an upper box II and a lower box II, wherein a heating workbench II is arranged in the lower box II, the upper box II and the lower box II can be opened and closed under the driving of a driving device, a sealing cavity II is formed when the upper box II and the lower box II are closed, the upper box II and the lower box II are locked through a locking device, a flexible pressing piece II is fixedly arranged on the upper box II, the sealing cavity is divided into an upper cavity II and a lower cavity II which are independent by the flexible pressing piece II, the upper cavity II is communicated with an inflating device, the heating workbench II is arranged in the lower cavity II, the photovoltaic module is a layered module, and the flexible pressing piece II is a silica gel plate;
the locking device comprises a second base body (661) and a bolt (662), a first jack (663) is arranged on the second upper box, a second jack (664) is arranged at a position of the second base body, which corresponds to a position of the upper jack of the upper box, the first jack and the second jack are both horizontally arranged, and the first jack and the second jack are connected through the bolt;
an inflation channel is arranged on the upper box II, the inflation device (650) is communicated with the inner cavity of the upper cavity II through the inflation channel, the inflation channel is communicated with the inflation device (650) through an inflation pipeline II (651), and an inflation valve (652) is arranged on the inflation pipeline II. (ii) a
The assembly is a photovoltaic assembly.
The method and the equipment are adopted to heat, pressurize and solidify the photovoltaic component, the upper cavity is filled with compressed gas in a non-vacuum state, the compressed gas applies positive pressure to the flexible pressing piece from the upper part of the flexible pressing piece, the flexible pressing piece deforms and presses the upper surface of the photovoltaic component, and the photovoltaic component in a molten state is received at the moment, so that the adhesive moves slowly when the photovoltaic component is pressed, the residual gas remained in the photovoltaic component can be continuously extruded outwards, bubbles are further discharged, and the vacuum pumping is not performed in the process, so that the adhesive in the photovoltaic component only moves under the action of the extrusion force, and cannot be pumped out; after the gas is filled, a gas chamber is formed above the flexible pressing piece, so that the flexible pressing piece forms an air bag, the pressure applied on the flexible pressing piece is uniform, and a high-pressure area is not easily formed when the flexible pressing piece acts on the corners of the photovoltaic module, so that the corners of the photovoltaic module are not easily bent and deformed. The method of the invention gradually increases the pressure applied to the photovoltaic module, the fluidity of the viscose liquid is slowly reduced, and the colloid of the viscose material has the tendency of slowly diffusing towards the peripheral edge, thereby being beneficial to discharging bubbles which are not discharged from the edge in the vacuum lamination process, and meanwhile, the viscose material has large viscosity, is not easy to flow outwards, does not generate a glue-free area at the edge, and is not easy to generate bubbles at the edge.
Drawings
FIG. 1 is a schematic view of the overall structure of an embodiment of a hot press of a pressing device for hot-pressing and curing a photovoltaic module according to the present invention;
FIG. 2 is a schematic structural view of a cross-sectional view of an embodiment of a hot press of a pressing device for hot-pressing and curing a photovoltaic module according to the present invention;
FIG. 3 is a schematic view of a connecting structure of an embodiment of a locking device of a hot press of a pressing device for hot-press curing of a photovoltaic module according to the present invention;
FIG. 4 is a photograph of the edge portion of a roof tile assembly encapsulated by the lamination process of the present invention without any voids in the edge portion caused by the absence of adhesive material;
fig. 5 is a photograph showing the state of the edge of the roof tile assembly encapsulated by the prior art lamination method, in which the edge adhesive material is missing to cause more voids, so that the adhesive material forms bubbles at the edge of the photovoltaic assembly.
Description of the reference numerals
610-upper box two 611-flexible pressing piece two 612-pressing frame two 613-clamp two 614-sealing ring two 615-upper box two 616-sealing cavity two 630-lower box two 631-heating workbench two 632-heating element 633-high-temperature cloth conveyor belt two 634-lower cavity two 650-inflating device 651-inflating pipeline two 653-inflating valve 660-locking device, 661-seat body two 662-plug pin 663-plug hole one 664-plug hole two 665-pull rod 666-buckle 667-threaded rod 668-lock catch 669-hook 680-driving device
Detailed Description
The invention is further described with reference to the following figures and examples:
as shown in fig. 1-3, the hot pressing curing pressing apparatus used in the present invention specifically includes an upper case two 610 and a lower case two 630, the upper case two is provided with a flexible pressing member two 611, the flexible pressing member two is sealed at a lower opening of the upper case two, in a preferred embodiment, a silicone plate is used as the flexible pressing member two, a pressing frame two 612 is disposed on two end surfaces of the upper case, the flexible pressing member two is located between an upper end surface of the pressing frame two and the upper case, the pressing frame two is fixedly connected with a case body of the upper case two through a clamp two 613 so as to fixedly dispose the silicone plate as the flexible pressing member two at the opening of the upper case two, a sealing ring two 614 is disposed on the lower end surface of the pressing frame two, a sealing cavity two serving as a curing cavity is formed by the sealing ring two when the upper case two and the lower case two are closed, the sealing cavity two is divided into an upper cavity two 615 and a lower cavity two 634 sealed and isolated from each other by the flexible pressing member, an inflation channel is disposed on the upper case two, the inflation device 650 is communicated with the inner cavity of the upper chamber two through an inflation channel (not shown in the figure), the inflation channel is communicated with the inflation device 650 through an inflation pipeline two 651, an inflation valve 652 is arranged on the inflation pipeline two to control the inflation amount and the inflation time, a heating workbench two 631 is arranged in the lower chamber two 630, a heating element 632 is arranged in the heating workbench two, the heating element can be a hot oil pipe or an electric heater, or an electric heating plate, when the heating pipe is the hot oil pipe, the hot oil pipe is connected with a hot oil supply device, when the heating pipe is the electric heater or the electric heating plate, the electric heater or the electric heating plate and a power supply device are arranged on a frame of the lower chamber two, a transmission chain (not shown in the figure) is arranged around the heating workbench two and is driven by a chain drive device, and a high-temperature cloth transmission belt two 633 is connected with the transmission chain. As shown in fig. 3, the locking device 660 may adopt a combination of an adjustable screw thread buckle and a hook, the adjustable screw thread buckle is generally arranged on the lower case two 630, a threaded rod 667 thereof is vertically arranged, a lock catch 668 thereof is positioned above, the hook is arranged on the upper case two 610, the position of the lock catch 668 is matched, a plurality of pairs of adjustable screw thread buckles 666 and hooks 665 are respectively arranged along the case body edges of the upper case two and the lower case two, and when the upper case two and the lower case two are closed, the upper case and the lower case are locked through the buckles 666 and the hooks 665. As shown in fig. 2, a locking device 660 with a structure can be further adopted, which comprises a second seat body 661 and a plug 662, wherein the lower end of the second seat body is fixedly connected with the second lower box, a first plug hole 663 is arranged on the second upper box, a second plug hole 664 is arranged at a position of the second seat body corresponding to the position of the first plug hole on the upper box, the first plug hole and the second plug hole are both horizontally arranged, the first plug hole and the second plug hole are connected through the plug, thereby the second upper box and the second lower box are fixedly connected through the second seat body and the plug, preferably, the first plug hole and the second plug hole are both wedge-shaped holes, the plug is a wedge-shaped pin, and the small end of the plug is used as an insertion end. For example, the locking device can also be designed into a hook and spring combined type, and comprises a hook part and a seat body two part, wherein a tension spring is arranged between the hook part and the seat body two part, the lower end of the seat body two part is rotatably connected with the lower box, and a hook platform is arranged on the upper box and connected with the hook.
The packaging of the photovoltaic module can be completed by adopting the following process, the battery module enters a vacuum laminating machine, the temperature of a heating plate is kept at the melting temperature of an adhesive layer, an upper box and a lower box are closed and then vacuumized, the adhesive layer of the photovoltaic module is heated to a melting state, in the process, the lower box is vacuumized, the vacuum degree reaches 100 +/-33 Pa and is kept for 5-7 minutes, then gas is filled into the upper box under the action of vacuum negative pressure to pressurize the photovoltaic module, the flexible pressurizing piece covers the battery module under the action of gas pressure and gradually coats the edge of the photovoltaic module, the adhesive tape attached to the edge of the photovoltaic module in advance is bent downwards under the downward pressure of the flexible pressurizing piece, the adhesive tape gradually seals the edge of the photovoltaic module, the inflation pressure is 0.04-0.1Mpa, and the pressurizing time is 5-12 minutes. In the process, as the viscose material for packaging the photovoltaic modules is heated to the melting temperature, the viscose material is in a melting state, the degree of crosslinking is relatively low, and the bubbles are easily extruded out of the modules under the action of vacuum environment and pressure, so that the bubbles among the photovoltaic modules are easily taken out. In the process of extruding the air bubbles, the edges of the air bubbles are gradually covered by the adhesive tape, so that the air bubbles can be prevented from entering the component layers again. After the vacuum heating and laminating are finished, the vacuum laminating machine is opened, the photovoltaic assembly is sent into the hot pressing machine, an upper box II and a lower box II of the hot pressing machine are closed, the upper box II and the lower box II are locked by a locking device, the photovoltaic assembly is continuously heated in the hot pressing machine to the curing temperature or above of the packaging material, namely the adhesive material, compressed air is filled into an upper cavity II, the pressure of the compressed air is determined according to the specific adhesive material and the assembly material, generally ranges from 0.01 to 0.1MPa, the optimal pressure ranges from 0.025 to 0.05MPa, the pressurizing speed is preferably controlled, the pressurizing is finished within 4 to 40 minutes, for example, within 5 to 15 minutes, positive pressure is applied to the photovoltaic assembly, and after the pressurizing is carried out for 5 to 15 minutes, the hot pressing machine is opened to finish hot pressing and curing.
In the process, the flexible pressing piece gradually covers the photovoltaic module under the action of compressed gas, the flexible pressing piece directly presses the photovoltaic module, after the upper cavity is filled with the compressed gas, the periphery of the flexible pressing piece is fixed by the pressing frame, so that the middle part of the flexible pressing piece bulges to form an air bag, the middle part of the flexible pressing piece firstly presses the middle part of the photovoltaic module and then gradually diffuses and presses the periphery of the photovoltaic module, therefore, bubbles in the photovoltaic module are pressed from the middle to the periphery to easily extrude the bubbles at the edge of the module, and as the internal temperature of the module rises, the curing is more complete, the density of an adhesive layer of the module is higher and higher, so that the external bubbles are not easily refilled into the adhesive layer, after the flexible pressing piece is completely contacted with the photovoltaic module, the photovoltaic module is pressed by adopting a positive pressure mode, and the photovoltaic module is prevented from being deformed due to the action of negative pressure under the action of vacuum negative pressure, therefore, the pressure is more even, especially the pressure at the edge is more even, the size selection range of the process pressure is larger, the flatness is better after the pressing and curing of the component, the positive pressure mode is adopted to apply pressure to the photovoltaic component, the technical problems that in the vacuum curing and pressurizing commonly adopted in the prior art, because the adhesive is good in adhesive connection degree at the curing temperature, the adhesive viscosity is larger, bubbles are not easy to discharge, and the edge local adhesive is reduced to generate a non-adhesive area, namely a cavity area, and a cavity is generated at the edge due to the fact that the adhesive liquid flows at the edge are easily vacuumized, and the foaming of the adhesive liquid is realized can be solved. In the method, the edge of the photovoltaic module is preferably sealed by the adhesive tape before heating and pressing, so that external bubbles are not easy to enter between the viscose of the photovoltaic module in the curing and pressing process, bubbles are effectively prevented from being generated, and the performance of the photovoltaic module is better. The method and the device are suitable for hot-pressing curing of layered assemblies made of multilayer materials such as photovoltaic assemblies, composite boards and the like. The adhesive is also suitable for products bonded by the existing common adhesives.
Example 1:
the photovoltaic module is a roof 100 tile module, the modified PTU or POE is used as a binder, the upper cover plate is a glass plate with the thickness of 3.2mm, and the lower plate is an FRB (also called a fiber back plate) with the thickness of 2 mm.
The first step, vacuum lamination, wherein the temperature of a first heating workbench of a laminating machine is 130-150 ℃, the first upper box and the first lower box are closed to simultaneously vacuumize the lower cavity of the upper cavity, the vacuum degree is 80-120Pa, the vacuumizing time is 350-500 seconds, a flexible pressing piece covers the surface of a photovoltaic assembly to pressurize the photovoltaic assembly, then gas is filled into the first upper cavity to heat and pressurize, the pressure is 0-0.05MPa, the first lower cavity is kept vacuumized, the heating and pressurizing time is 5-7 minutes, and then the photovoltaic assembly is cured, heated and pressurized in a hot pressing machine.
Second, hot-pressing and solidifying the glue
The temperature of a second heating workbench in the hot press is 155-;
thirdly, pressure cooling
The photovoltaic assembly enters the lower cooling plate I, the upper cooling plate I and the lower cooling plate I are closed after being buffered by the buffer device, the cooling cavity is vacuumized, the photovoltaic assembly is pressed under the action of the difference between internal pressure and external pressure by the upper cooling plate I and the lower cooling plate I, the vacuum degree is 0-0.08Mpa, the temperatures of the upper cooling plate and the lower cooling plate are 14-15 ℃, and the vacuum cooling and pressurizing time is 9-12 minutes. And cooling the photovoltaic module to 14 +/-1 ℃ to finish curing and packaging.
Examples 2,
The photovoltaic module is a glass curtain wall component under the house, adopts PVB as a binder, and the upper plate is 2.5mm thick glass, and the hypoplastron is 8mm thick glass.
In the first step, the temperature of a heating workbench of the laminating machine is 150 +/-10 ℃, the vacuum degree is 80-120Pa, the vacuumizing time is 3-5 minutes, the upper cavity is filled with gas, the pressure is 0-0.05MPa, and the heating and pressurizing time is 5-7 minutes.
The second step, the temperature of the heating workbench II is 160-170 ℃, compressed air is filled into the upper cavity II, the pressure is 0.02-0.1Mpa, the time of inflation, pressurization and heating is 8-10 minutes,
and thirdly, the temperature of the upper cooling plate and the lower cooling plate is 13 ℃ with the vacuum degree of 0-0.08Mpa, and the vacuum cooling and pressurizing time is 7-10 minutes.
The rest of the procedure is the same as in example 1
The following comparative example was prepared by using the conventional lamination process, followed by vacuum hot pressing, vacuum hot pressing for curing, and cooling. The vacuum hot pressing, vacuum solidification and cooling are carried out by adopting a rubber plate pressing process and a flexible pressing piece.
Comparative example 1, the photovoltaic module was a roofing tile module, using modified PTU or POE as the binder. The upper cover plate is 3.2mm glass, and the lower plate is 2mm FRB (fiber back plate).
In the vacuum hot pressing process, the temperature of a heating workbench of a laminating machine is 140 ℃, the vacuum degree is 80-120Pa, the vacuumizing time is 4-5 minutes, the gas filling pressure is 0.8-one atmosphere, and the vacuumizing heating and pressurizing time is 5-7 minutes. In the vacuum curing process, the temperature of a heating workbench is 160-170 ℃, the vacuum degree is 0.03-0.1Mpa, the vacuumizing time is 4-5 minutes, the curing time is 6-12 minutes, and in the cooling process, the temperature of a cooling workbench is 20 ℃, and the cooling time is 10-18 minutes.
Comparative example 2
The photovoltaic module is a glass curtain wall module, and PVB is used as a binder. The vacuum pumping time is 350-500 seconds.
In the vacuum hot pressing process, the temperature of a heating workbench of the laminating machine is 130-150 ℃, the vacuum degree is 80-120Pa, the vacuumizing time is 4-5 minutes, the pressure of the filled gas is one atmosphere, and the heating and pressurizing time is 11-16 minutes. In the vacuum curing process, the temperature of a heating workbench is 160-170 ℃, the vacuum degree is 0.03-0.1Mpa, the vacuumizing time is 4-5 minutes, the curing time is 6-12 minutes, and in the cooling process, the temperature of a cooling workbench is 20-25 ℃, and the cooling time is 10-18 minutes.
Photovoltaic module quality comparison table
Claims (9)
1. The method for curing the photovoltaic module by hot pressing is characterized in that a sealing cavity II serving as a curing cavity is divided into an upper cavity II and a lower cavity II which are mutually independent by a flexible pressing piece, the layered piece which completes the vacuum heating and pressurizing step is transferred into the lower cavity II, after the cavity of the curing cavity is closed, the upper cavity II is filled with compressed gas in a non-vacuum state, the flexible pressing piece is pressed against the upper surface of the photovoltaic module to heat and pressurize the photovoltaic module for curing, and the photovoltaic module is not vacuumized in the heating and curing process.
2. The method according to claim 1, wherein after the cavity is closed, the layered assembly is heated to the curing temperature of the adhesive material of the layered assembly, and then the compressed gas is filled into the second upper cavity to heat and pressurize the layered assembly.
3. The method for hot-pressing curing of a photovoltaic module as claimed in claim 1, wherein the pressure of the gas filled into the second upper chamber is 0.01-0.1Mpa, the gas filling time is 4-40 minutes, and the pressure is applied for 5-15 minutes after the gas filling.
4. The method of thermocompressive curing of a photovoltaic module of claim 3 wherein the layered module is a photovoltaic module.
5. The method for curing a photovoltaic module by hot pressing according to claim 4, wherein the photovoltaic module is a roof tile module, the adhesive is PTU or POE, the curing temperature is 155 ℃ and 175 ℃, and the pressure is 0.03-0.1 MPa.
6. The method according to claim 1 or 2, wherein the peripheral edges of the laminate assembly are hermetically sealed before the curing by applying heat and pressure.
7. A pressing device for hot-pressing curing of a photovoltaic module is characterized by comprising an upper box II and a lower box II, wherein the upper box II and the lower box II can be opened and closed under the driving of a driving device, a sealing cavity II is formed when the upper box II and the lower box II are closed, the upper box II and the lower box II are locked through a locking device, a flexible pressing piece II is fixedly arranged on the upper box II, the sealing cavity is divided into an upper cavity II and a lower cavity II which are independent by the flexible pressing piece II, the upper cavity II is communicated with an inflating device, the photovoltaic module is not vacuumized when being pressed, compressed gas is filled into the upper cavity in a non-vacuum state, the photovoltaic module is pressed in a positive pressure mode, a heating workbench II is arranged in the lower box II, and the flexible pressing piece II is a silica gel plate.
8. The pressing apparatus for thermal compression curing of photovoltaic modules according to claim 7, wherein the locking device comprises a second base body (661) and a pin (662), a first socket (663) is provided on the second upper case, a second socket (664) is provided at a position of the second base body corresponding to a position of the socket on the upper case, both the first socket and the second socket are horizontally provided, and the first socket and the second socket are connected by the pin.
9. The pressing apparatus for thermal compression curing of photovoltaic modules according to claim 7, wherein an inflation channel is provided on the second upper chamber, the inflator (650) is communicated with the inner cavity of the second upper chamber through the inflation channel, the inflation channel is communicated with the inflator (650) through a second inflation pipe (651), and an inflation valve (652) is provided on the second inflation pipe.
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