Coating composite type solar cell backboard and production line thereof

Abstract

The invention belongs to the technical field of photovoltaic module production, and particularly relates to a coated composite solar cell backboard and a production line thereof.The coated composite solar cell backboard comprises a backboard layer and a PET base layer, one side of the PET base layer is coated with a coating, and the other side of the PET base layer is compounded with the backboard layer through a middle layer, the PET base layer is coated with a coating through a production line and is directly compounded with the middle layer and the back plate layer after being cured, and the coating comprises the following components in percentage by mass: 30-55% of fluorine-containing paint; 20-40% of a solvent; 2-6% of a cross-linking agent and a curing agent; 15-40% of a filler; through the integrated production process, the PET base layer is coated and cured through the production line and then is directly compounded with the middle layer and the back plate, the production efficiency is effectively improved, the technological process is simplified, multiple times of opening and winding are avoided, the influence on the product quality is avoided, and the good energy-saving and environment-friendly effects are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of photovoltaic component production, and in particular relates to a coated composite solar cell back panel and a production line thereof. Background Art

[0002] The solar cell backsheet is located on the back of the solar cell and plays a role in protecting and supporting the cell. It needs to have reliable mechanical properties, insulation, water resistance, aging resistance and other properties to ensure the life of the solar power generation module. From the perspective of molding process, solar cell backsheets can be divided into coated type, composite type and coated / composite type. Among them, the coated backsheet mainly coats fluorocarbon coating on the substrate PET to achieve the functionalization of the backsheet, while the composite backsheet uses adhesives to bond the substrate and the fluorine-containing film together. The composite and coated / composite types organically combine coating technology and adhesive composite technology, and coat and composite on both sides of the substrate to obtain a backsheet with one side coated and the other side adhesively composited.

[0003] However, the coating and lamination of traditional coated composite solar cell back panels are usually carried out using two production lines, which require multiple unwinding and rewinding, low efficiency, complex process flow, and easily affected product quality, and are not energy-saving and environmentally friendly. Summary of the invention

[0004] The purpose of the present invention is to provide a coated composite solar cell back panel and its production line in order to solve the above-mentioned technical problems, so as to achieve a production process that can integrate coating and compounding, avoid multiple opening and winding, improve efficiency, simplify the process, improve product quality and have the effect of energy saving and environmental protection.

[0005] In view of this, the present invention provides a coated composite solar cell back sheet, comprising:

[0006] Back plate layer;

[0007] PET base layer, one side is coated with a coating, and the other side is laminated with the backing layer through an intermediate layer;

[0008] Among them, the PET base layer is directly compounded with the middle layer and the backboard layer after being coated and cured through the production line.

[0009] In the above technical solution, further:

[0010] The coating comprises the following components in mass ratio: 30-55% of fluorine-containing coating; 20-40% of solvent; 2-6% of crosslinking agent and curing agent; and 15-40% of filler.

[0011] A production line for coating a composite solar cell back sheet, comprising:

[0012] Feed rollers, including PET feed rollers, middle layer feed rollers and back plate layer feed rollers;

[0013] Winding roller;

[0014] The oven mechanism has a first heating chamber for curing the coating layer and a second heating chamber for curing the bonding of the PET base layer and the back plate layer;

[0015] A self-temperature regulating mechanism, installed on the side of the second heating chamber and used for self-regulating the temperature of the second heating chamber;

[0016] A coating mechanism is installed at the front side of the first heating chamber and is used for coating the PET base layer;

[0017] The laminating mechanism is installed at the front side of the second heating chamber and is used for laminating the PET base layer, the middle layer and the back plate layer after the coating is applied and cured;

[0018] The first heating chamber is connected to a steam generator, and a connecting hole is provided between the first heating chamber and the second heating chamber.

[0019] In the above technical solution, further, the oven mechanism includes:

[0020] The box body is provided with a first drying channel for the coating to pass through during curing and a second drying channel for the bonding to pass through during curing, and the first heating chamber is arranged around the first drying channel, and the second heating chamber is arranged on both sides of the second drying channel;

[0021] A first heat insulation layer is arranged between the first drying channel and the second drying channel, and second heat insulation layers are arranged at both ends of the first drying channel and the second drying channel, and slots are opened in the second heat insulation layers.

[0022] In the above technical solution, further:

[0023] The second heating chamber includes a serpentine flow channel and a straight flow channel. The serpentine flow channel is arranged on both sides of the second drying channel, and the starting end is connected to the connecting hole. The straight flow channel is arranged on one side of the serpentine flow channel, and the starting end is connected to the connecting hole, and is used to directly guide the steam through the second drying channel.

[0024] Among them, the self-temperature regulating mechanism includes:

[0025] A first switching component is installed at the connection hole and is used to switch between the connection hole and the serpentine flow channel or the connection hole and the straight flow channel;

[0026] A driving component is installed in the second drying tunnel and is used to drive the first switching component to conduct the connecting hole and the direct current channel when the temperature of the second drying tunnel is too high;

[0027] Wherein, the serpentine flow channel and the straight flow channel are both connected to the air outlet pipe.

[0028] In the above technical solution, further, the first switching component includes:

[0029] The valve body is installed at the connecting hole and is provided with an air inlet connected to the connecting hole, a first air outlet connected to the straight flow channel, and a second air outlet connected to the serpentine flow channel;

[0030] The valve core is installed in the valve body and has an L-shaped flow channel inside, one end of which is always connected to the air inlet, and the other end switches between the first air outlet and the second air outlet;

[0031] A valve stem is connected to the valve core, and one end of the valve stem extends out of the valve body and is connected to the output end of the drive assembly;

[0032] The valve seat is installed in the valve body and is used for sealing connection between the valve core and the inner wall of the valve body.

[0033] In the above technical solution, further, the driving component includes:

[0034] The piston cylinder is installed in the second drying tunnel and has an opening at one end thereof and extends into the second heat insulation layer;

[0035] A piston is slidably connected in the piston cylinder;

[0036] A gear, sleeved on the valve stem;

[0037] A rack connected to an end of the piston close to the opening of the piston cylinder and extending out of the piston cylinder to mesh with the gear;

[0038] A spring is installed in the second heat insulation layer, and two ends of the spring are respectively in contact with the inner wall of the second heat insulation layer and an end of the rack away from the piston;

[0039] The piston can push the rack to rotate the gear when the temperature in the second drying channel is too high.

[0040] In the above technical solution, further:

[0041] A plurality of heat exchange fins are arranged on the surface of the piston cylinder.

[0042] In the above technical solution, further:

[0043] The end of the serpentine flow channel is connected to the end of the straight flow channel, and a second switching component is provided at the connection;

[0044] The end of the serpentine flow channel is vertically arranged with respect to the end of the straight flow channel.

[0045] In the above technical solution, further, the second switching component includes:

[0046] The partition is installed at the connection between the end of the serpentine flow channel and the end of the straight flow channel, and one end is hinged to the inner wall of the connection, and the other end extends to one side of the outlet pipe;

[0047] The partition is arranged at an angle and abuts against the inner wall of the direct current channel.

[0048] The beneficial effects of the present invention are:

[0049] 1. Through the integrated production process, the PET base layer is coated and cured through the production line and then directly compounded with the middle layer and the back plate, which effectively improves the production efficiency, simplifies the process flow, avoids multiple opening and winding, avoids affecting the product quality, and has a good energy-saving and environmental protection effect.

[0050] 2. By adopting an oven mechanism having a first heating chamber for coating curing and a second heating chamber for bonding curing, and adjusting the temperature of the second heating chamber by a self-temperature regulating component, that is, the temperature of the first heating chamber is controlled by a steam generator, and the second heating chamber is adjusted by a self-temperature regulating component, the problem of requiring two heating chambers with different temperatures due to the different temperatures required for coating curing and bonding curing can be effectively solved.

[0051] 3. By using the steam used in the first heating chamber as the heat source of the second heating chamber, a better energy-saving effect is achieved and the thermal energy utilization rate of the steam is improved; at the same time, by changing the flow mode of the steam on the side of the second drying channel, the heat exchange time between the steam and the second drying channel is changed to control the temperature of the second drying channel. The structure is simple and easy to control.

[0052] 4. The piston is pushed to move and the valve core is driven to switch by the increase of air pressure caused by the temperature increase in the piston cylinder, which can ensure the response to the temperature increase of the second drying channel in the non-sealed environment of the second drying channel, and has the effect of simplifying the structure and saving energy and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 It is a schematic diagram of the structure of the present invention;

[0054] Figure 2 It is a structural schematic diagram of the production line of the present invention;

[0055] Figure 3 It is a structural schematic diagram of the oven mechanism of the present invention;

[0056] Figure 4 is a top view of the oven mechanism of the present invention;

[0057] Figure 5 The present invention Figure 4 Sectional view at AA in the middle;

[0058] Figure 6 The present invention Figure 5 The enlarged view of point B in the middle;

[0059] Figure 7 The present invention Figure 4 Sectional view at CC;

[0060] Figure 8 The present invention Figure 7 The enlarged view of point D in the middle;

[0061] Fig. 9 is an exploded schematic diagram of the first switching assembly and the driving assembly of the present invention;

[0062] The symbols in the figure are as follows: 1, backboard layer; 2, PET base layer; 3, coating layer; 4, middle layer; 5, PET feeding roller; 6, middle layer feeding roller; 7, backboard layer feeding roller; 8, winding roller; 9, oven mechanism; 90, first heating chamber; 91, second heating chamber; 910, serpentine flow channel; 911, straight flow channel; 92, box; 93, first drying channel; 94, second drying channel; 95, first heat insulation layer; 96, second heat insulation layer; 97, slot; 10, self-temperature regulating mechanism; 11. Coating mechanism; 12. Composite mechanism; 13. Connecting hole; 14. First switching assembly; 140. Valve body; 141. Air inlet; 142. First air outlet; 143. Second air outlet; 144. Valve core; 145. L-shaped flow channel; 146. Valve stem; 147. Valve seat; 15. Drive assembly; 150. Piston cylinder; 151. Piston; 152. Gear; 153. Rack; 154. Spring; 155. Heat exchange fin; 16. Air outlet pipe; 17. Partition. DETAILED DESCRIPTION

[0063] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0064] Embodiment 1:

[0065] This embodiment provides a coated composite solar cell back sheet, comprising:

[0066] Backplane layer 1;

[0067] The PET base layer 2 is coated with a coating 3 on one side and is composited with the backing layer 1 via an intermediate layer 4 on the other side;

[0068] The PET base layer 2 is directly compounded with the middle layer 4 and the back sheet layer 1 after being coated with the coating 3 through the production line and cured;

[0069] Meanwhile, the coating 3 comprises the following components in mass ratio: 30-55% of fluorine-containing coating; 20-40% of solvent; 2-6% of crosslinking agent and curing agent; 15-40% of filler;

[0070] Furthermore, the intermediate layer 4 is an adhesive.

[0071] It can be seen from this embodiment that through an integrated production process, the PET base layer 2 is coated and cured through the production line and then directly composited with the middle layer 4 and the back panel, which effectively improves production efficiency, simplifies the process flow, avoids multiple opening and winding, avoids affecting product quality, and has a good energy-saving and environmental protection effect.

[0072] Embodiment 2:

[0073] This embodiment provides a production line for coating a composite solar cell back sheet, comprising:

[0074] Feed rollers, including a PET feed roller 5, an intermediate layer feed roller 6 and a back plate layer feed roller 7;

[0075] Winding roller 8;

[0076] The oven mechanism 9 has a first heating chamber 90 for curing the coating 3 and a second heating chamber 91 for bonding and curing the PET base layer 2 and the back plate layer 1;

[0077] The self-temperature regulating mechanism 10 is installed on the side of the second heating chamber 91 and is used to self-regulate the temperature of the second heating chamber 91;

[0078] A coating mechanism 11 is installed at the front side of the first heating chamber 90 and is used for coating the coating layer 3 on the PET base layer 2;

[0079] The composite mechanism 12 is installed at the front side of the second heating chamber 91 and is used for composite the PET base layer 2, the middle layer 4 and the back plate layer 1 after the coating 3 is coated and cured;

[0080] The first heating chamber 90 is connected to a steam generator, and a connecting hole 13 is provided between the first heating chamber 90 and the second heating chamber 91;

[0081] At the same time, the production line also includes a plurality of free rollers, which mainly play the role of changing the conveying direction, and a tension regulator for adjusting the tension during conveying. The composite mechanism 12 includes a driving roller and a clamping roller, and the coating mechanism 11 is a coater. Its specific structure is an existing mature technology and will not be repeated here.

[0082] It can be seen from this embodiment that by adopting an oven mechanism 9 having a first heating chamber 90 for curing the coating 3 and a second heating chamber 91 for bonding curing, and adjusting the temperature of the second heating chamber 91 by a self-temperature regulating component, that is, the temperature of the first heating chamber 90 is controlled by a steam generator, and the second heating chamber 91 is adjusted by a self-temperature regulating component, the problem of requiring two heating chambers with different temperatures due to the different temperatures required for curing the coating 3 and curing the bonding can be effectively solved;

[0083] Furthermore, the curing temperature of the coating 3 is higher than the curing temperature of the bonding. Therefore, by using the steam in the first heating chamber 90 as the heat source of the second heating chamber 91, a better energy-saving effect is achieved, and the thermal energy utilization rate of the steam is improved.

[0084] Embodiment 3:

[0085] This embodiment provides a production line for coating a composite solar cell back sheet. In addition to the technical solutions of the above embodiments, it also has the following technical features. The oven mechanism 9 includes:

[0086] The box body 92 is provided with a first drying channel 93 for the coating 3 to pass through during curing and a second drying channel 94 for the bonding to pass through during curing, and the first heating chamber 90 is arranged around the first drying channel 93, and the second heating chambers 91 are arranged on both sides of the second drying channel 94;

[0087] A first heat insulating layer 95 is disposed between the first drying channel 93 and the second drying channel 94, and a second heat insulating layer 96 is disposed at both ends of the first drying channel 93 and the second drying channel 94, and a slot 97 is formed in the second heat insulating layer 96;

[0088] At the same time, the first thermal insulation layer 95 is filled with thermal insulation material, and the present application does not limit the thermal insulation material. It is the existing technology and it only needs to have a thermal insulation effect.

[0089] It can be seen from the present embodiment that the first heat insulating layer 95 is provided to avoid mutual influence of the temperature between the first drying tunnel 93 and the second drying tunnel 94, thereby ensuring the temperature stability in the first drying tunnel 93 and the second drying tunnel 94, and the second heat insulating layer 96 is provided to further improve the temperature stability in the first drying tunnel 93 and the second drying tunnel 94, and the slot 97 facilitates the coated PET base layer 2 to enter the first drying tunnel 93 and the PET base layer 2, the intermediate layer 4 and the backboard layer 1 to enter the second drying tunnel 94 after compounding.

[0090] Embodiment 4:

[0091] This embodiment provides a production line for coating a composite solar cell back sheet, which, in addition to the technical solutions of the above embodiments, also has the following technical features:

[0092] The second heating chamber 91 includes a serpentine flow channel 910 and a straight flow channel 911. The serpentine flow channel 910 is arranged on both sides of the second drying channel 94, and the starting end is connected to the connecting hole 13. The straight flow channel 911 is arranged on one side of the serpentine flow channel 910, and the starting end is connected to the connecting hole 13, and is used to guide the steam directly through the second drying channel 94.

[0093] Wherein, the self-temperature regulating mechanism 10 comprises:

[0094] The first switching assembly 14 is installed at the connection hole 13 and is used to switch between the connection hole 13 and the serpentine flow channel 910 or the connection hole 13 and the straight flow channel 911;

[0095] The driving assembly 15 is installed in the second drying tunnel 94 and is used to drive the first switching assembly 14 to conduct the connecting hole 13 and the direct current channel 911 when the temperature of the second drying tunnel 94 is too high;

[0096] The serpentine flow channel 910 and the straight flow channel 911 are both connected to the air outlet pipe 16 .

[0097] It can be seen from this embodiment that the temperature of the second drying channel 94 is controlled by changing the flow mode of steam on the side of the second drying channel 94 and then changing the heat exchange time between the steam and the second drying channel 94. The structure is simple and easy to control.

[0098] The exhaust pipe 16 is convenient for collecting the steam after heat exchange to avoid affecting the production environment.

[0099] Embodiment 5:

[0100] This embodiment provides a production line for coating a composite solar cell back sheet, which, in addition to the technical solutions of the above embodiments, also has the following technical features. The first switching component 14 includes:

[0101] The valve body 140 is installed at the connection hole 13 and is provided with an air inlet 141 communicating with the connection hole 13, a first air outlet 142 communicating with the direct flow channel 911, and a second air outlet 143 communicating with the serpentine flow channel 910;

[0102] The valve core 144 is installed in the valve body 140 and has an L-shaped flow channel 145L formed therein, one end of which is always connected to the air inlet 141 and the other end of which switches between the first air outlet 142 and the second air outlet 143;

[0103] The valve stem 146 is connected to the valve core 144, and one end of the valve stem extends out of the valve body 140 and is connected to the output end of the driving assembly 15;

[0104] The valve seat 147 is installed in the valve body 140 and is used for sealing connection between the valve core 144 and the inner wall of the valve body 140;

[0105] Among them, a card slot is opened on the side of the valve core 144 close to the valve stem 146, and the valve stem 146 and the valve core 144 are card-connected. At the same time, the valve stem 146 and the air inlet 141 are coaxially arranged to ensure that when the valve core 144 rotates, the air inlet 141 always rotates around its axis.

[0106] It can be seen from the present embodiment that by providing an L-shaped flow channel 145L on the valve core 144, when one end of the L-shaped flow channel 145L is always connected to the air inlet 141, the first air outlet 142 and the second air outlet 143 can be switched on the vertical plane, and then the serpentine flow channel 910 and the straight flow channel 911 can be switched on the vertical plane, ensuring that the serpentine flow channel 910 and the straight flow channel 911 can be closely attached to the surface of the box body 92 located on the second drying channel 94, thereby ensuring the heat exchange efficiency;

[0107] The valve seat 147 can improve the sealing performance and prevent steam leakage from affecting the production environment or causing scalding of personnel.

[0108] Embodiment 6:

[0109] This embodiment provides a production line for coating a composite solar cell back sheet. In addition to the technical solutions of the above embodiments, it also has the following technical features. The driving component 15 includes:

[0110] The piston cylinder 150 is installed in the second drying tunnel 94 and has an opening at one end, and extends into the second heat insulation layer 96;

[0111] The piston 151 is slidably connected in the piston cylinder 150;

[0112] The gear 152 is sleeved on the valve stem 146;

[0113] The rack 153 is connected to one end of the piston 151 close to the opening of the piston cylinder 150 and extends out of the piston cylinder 150 to mesh with the gear 152;

[0114] The spring 154 is installed in the second heat insulation layer 96, and its two ends are respectively in contact with the inner wall of the second heat insulation layer 96 and the end of the rack 153 away from the piston 151;

[0115] The piston 151 can push the rack 153 to rotate the gear 152 when the temperature in the second drying tunnel 94 is too high;

[0116] At the same time, an annular groove is formed on the surface of the piston 151, and a rubber ring is sleeved on the annular groove to improve the sealing performance with the inner wall of the piston cylinder 150, and the other end of the piston cylinder 150, that is, the end located in the second drying channel 94, is closed.

[0117] It can be seen from this embodiment that by locating the piston cylinder 150 and the piston 151 in the second drying tunnel 94 and forming a sealed structure inside, it is possible to ensure that the temperature increase of the second drying tunnel 94 is responded to in an unsealed environment of the second drying tunnel 94, that is, the temperature in the piston cylinder 150 increases, the air pressure increases, and then the piston 151 is pushed to move, which has the effect of simplifying the structure and saving energy and protecting the environment;

[0118] Meanwhile, the other end of the piston cylinder 150 is open, i.e., a non-sealed environment, thereby preventing the other side of the piston 151 from being affected by the temperature rise and affecting the movement of the piston 151, and using the spring 154 as the reset force to further avoid the influence of temperature during reset, ensuring that the piston 151 can be reset after the temperature in the second drying channel 94 drops, and then switching the steam flow to the serpentine flow channel 910, achieving the effect of automatic regulation.

[0119] Embodiment 7:

[0120] This embodiment provides a production line for coating a composite solar cell back sheet, which, in addition to the technical solutions of the above embodiments, also has the following technical features:

[0121] The surface of the piston cylinder 150 is provided with a plurality of heat exchange fins 155;

[0122] The heat exchange fins 155 are arranged at equal intervals, and the piston cylinders 150 are of an integrated structure.

[0123] It can be seen from this embodiment that by arranging a plurality of heat exchange fins 155 on the surface of the piston cylinder 150, the heat exchange efficiency between the piston cylinder 150 and the second drying channel 94 is improved, thereby ensuring the reliability and stability of the piston cylinder 150 in responding to the temperature increase in the second drying channel 94.

[0124] Embodiment 8:

[0125] This embodiment provides a production line for coating a composite solar cell back sheet, which, in addition to the technical solutions of the above embodiments, also has the following technical features:

[0126] The end of the serpentine flow channel 910 is connected to the end of the straight flow channel 911, and a second switching component is provided at the connection;

[0127] The end of the serpentine flow channel 910 is vertically arranged with respect to the end of the straight flow channel 911 .

[0128] It can be seen from the present embodiment that by connecting the end of the serpentine flow channel 910 with the end of the straight flow channel 911, that is, using a single air outlet pipe 16, the structure is further simplified, and the second switching component can avoid the temperature of the second drying channel 94 from rising, and when the second heating chamber 91 uses the straight flow channel 911 for heat exchange, steam is prevented from entering the serpentine flow channel 910, thereby affecting the control and regulation of the temperature in the second drying channel 94.

[0129] Embodiment 9:

[0130] This embodiment provides a production line for coating a composite solar cell back sheet. In addition to the technical solutions of the above embodiments, it also has the following technical features: the second switching component includes:

[0131] The partition plate 17 is installed at the connection between the end of the serpentine flow channel 910 and the end of the straight flow channel 911, and one end is hinged to the inner wall of the connection, and the other end extends to the side of the outlet pipe 16;

[0132] The partition 17 is tilted and abuts against the inner wall of the direct current channel 911 .

[0133] It can be seen from this embodiment that, through the setting of the partition 17, when the serpentine flow channel 910 is adopted, the steam will push the partition 17 to block the straight flow channel 911, and vice versa, when the straight flow channel 911 is adopted, the steam will push the partition 17 to block the serpentine flow channel 910, and the steam flow is automatically regulated, and the structure is simple, and the stability and reliability are good;

[0134] Furthermore, a rubber sleeve may be provided on the surface of the partition 17 to further ensure the sealing effect.

[0135] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A coated composite solar cell back sheet, characterized in that: include: Back plate layer (1); A PET base layer (2) having a coating layer (3) coated on one side and a back plate layer (1) laminated with the other side via an intermediate layer (4); The PET base layer (2) is coated with a coating layer (3) through a production line and cured, and then directly composited with the middle layer (4) and the backboard layer (1).

2. The coated composite solar cell back sheet according to claim 1, characterized in that: The coating (3) comprises the following components in the following mass ratios: 30-55% of fluorine-containing coating; 20-40% of solvent; 2-6% of crosslinking agent and curing agent; and 14-40% of filler.

3. A production line for coating composite solar cell backsheets according to claim 1, characterized in that: include: Feed rollers, including a PET feed roller (5), an intermediate layer feed roller (6) and a back plate layer feed roller (7); Winding roller (8); The oven mechanism (9) has a first heating chamber (90) for curing the coating layer (3) and a second heating chamber (91) for bonding and curing the PET base layer (2) and the back plate layer (1); A self-temperature regulating mechanism (10) is installed on the side of the second heating chamber (91) and is used to self-regulate the temperature of the second heating chamber (91); A coating mechanism (11) is installed at the front side of the first heating chamber (90) and is used for coating the coating layer (3) on the PET base layer (2); A laminating mechanism (12), installed at the front side of the second heating chamber (91), and used for laminating the PET base layer (2), the middle layer (4) and the back plate layer (1) after the coating (3) is applied and cured; Wherein, the first heating chamber (90) is connected to a steam generator, and a connecting hole (13) is provided between the first heating chamber (90) and the second heating chamber (91).

4. The production line for coating composite solar cell backsheet according to claim 3, characterized in that: The oven mechanism (9) comprises: A box body (92) is provided with a first drying channel (93) for the coating (3) to pass through when solidifying and a second drying channel (94) for the bonding to pass through when solidifying, and a first heating chamber (90) is arranged around the first drying channel (93), and a second heating chamber (91) is arranged on both sides of the second drying channel (94); A first heat insulating layer (95) is provided between the first drying channel (93) and the second drying channel (94), and second heat insulating layers (96) are provided at both ends of the first drying channel (93) and the second drying channel (94), and the second heat insulating layer (96) is provided with slots (97).

5. The production line for coating composite solar cell backsheet according to claim 4, characterized in that: The second heating chamber (91) comprises a serpentine flow channel (910) and a straight flow channel (911), the serpentine flow channel (910) being arranged on both sides of the second drying channel (94), and the starting end thereof being connected to the connecting hole (13), the straight flow channel (911) being arranged on one side of the serpentine flow channel (910), and the starting end thereof being connected to the connecting hole (13), and being used for directing the steam to flow directly through the second drying channel (94); Wherein, the self-temperature regulating mechanism comprises: A first switching component (14) is installed at the connection hole (13) and is used to switch between the connection between the connection hole (13) and the serpentine flow channel (910) or the connection between the connection hole (13) and the straight flow channel (911); A driving component (15) is installed in the second drying tunnel (94) and is used to drive the first switching component (14) to conduct the connection hole (13) and the direct current channel (911) when the temperature of the second drying tunnel (94) is too high; Wherein, the serpentine flow channel (910) and the straight flow channel (911) are both connected to the air outlet pipe (16).

6. The production line for coating composite solar cell backsheet according to claim 5, characterized in that The first switching component (14) comprises: The valve body (140) is installed at the connection hole (13) and is provided with an air inlet (141) connected to the connection hole (13), a first air outlet (142) connected to the straight channel (911), and a second air outlet (143) connected to the serpentine channel (910); A valve core (144) is installed in the valve body (140) and has an L-shaped flow channel (145) therein, one end of which is always connected to the air inlet (141) and the other end of which switches between the first air outlet (142) and the second air outlet (143); A valve stem (146) is connected to the valve core (144), and one end of the valve stem extends out of the valve body (140) and is connected to the output end of the drive assembly (15); The valve seat (147) is installed in the valve body (140) and is used for sealing connection between the valve core (144) and the inner wall of the valve body (140).

7. The production line for coating composite solar cell backsheet according to claim 6, characterized in that: The driving assembly (15) comprises: A piston cylinder (150) is installed in the second drying tunnel (94) and has an opening at one end thereof and extends into the second heat insulation layer (96); A piston (151) is slidably connected in the piston cylinder (150); A gear (152) is sleeved on the valve stem (146); A rack (153) is connected to an end of the piston (151) close to the opening of the piston cylinder (150) and extends out of the piston cylinder (150) to mesh with the gear (152); A spring (154) is installed in the second heat insulation layer (96), and its two ends are respectively in contact with the inner wall of the second heat insulation layer (96) and an end of the rack (153) away from the piston (151); The piston (151) can push the rack (153) to rotate the gear (152) when the temperature in the second drying tunnel (94) is too high.

8. The production line for coating composite solar cell backsheet according to claim 7, characterized in that: A plurality of heat exchange fins (155) are arranged on the surface of the piston cylinder (150).

9. The production line for coating composite solar cell backsheet according to claim 5, characterized in that: The end of the serpentine flow channel (910) is connected to the end of the straight flow channel (911), and a second switching component is provided at the connection; Wherein, the end of the serpentine flow channel (910) and the end of the straight flow channel (911) are arranged perpendicularly.

10. The production line for coating composite solar cell backsheet according to claim 9, characterized in that: The second switching component comprises: The partition plate (17) is installed at the connection between the end of the serpentine flow channel (910) and the end of the straight flow channel (911), and one end is hingedly connected to the inner wall of the connection, and the other end extends toward one side of the outlet pipe (16); The partition plate (17) is arranged at an angle and abuts against the inner wall of the direct flow channel (911).

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