CN107804054A - TPT backboards, hot-press method and the hot-press equipment of a kind of photovoltaic cell - Google Patents
TPT backboards, hot-press method and the hot-press equipment of a kind of photovoltaic cell Download PDFInfo
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- CN107804054A CN107804054A CN201610815397.9A CN201610815397A CN107804054A CN 107804054 A CN107804054 A CN 107804054A CN 201610815397 A CN201610815397 A CN 201610815397A CN 107804054 A CN107804054 A CN 107804054A
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- 238000000034 method Methods 0.000 title claims abstract description 46
- 238000007731 hot pressing Methods 0.000 claims abstract description 97
- 238000001816 cooling Methods 0.000 claims abstract description 44
- 230000003746 surface roughness Effects 0.000 claims description 16
- 238000003825 pressing Methods 0.000 claims description 13
- 238000004804 winding Methods 0.000 claims description 13
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 10
- 238000000576 coating method Methods 0.000 claims description 10
- 229910052804 chromium Inorganic materials 0.000 claims description 9
- 239000011651 chromium Substances 0.000 claims description 9
- 239000011248 coating agent Substances 0.000 claims description 7
- 238000005096 rolling process Methods 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 229920002620 polyvinyl fluoride Polymers 0.000 description 22
- 239000010410 layer Substances 0.000 description 10
- 239000000463 material Substances 0.000 description 7
- 229920000139 polyethylene terephthalate Polymers 0.000 description 7
- 239000005020 polyethylene terephthalate Substances 0.000 description 7
- 229920002799 BoPET Polymers 0.000 description 6
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 238000009713 electroplating Methods 0.000 description 3
- 239000005038 ethylene vinyl acetate Substances 0.000 description 3
- 229910052731 fluorine Inorganic materials 0.000 description 3
- 239000011737 fluorine Substances 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000005498 polishing Methods 0.000 description 3
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 3
- -1 polyethylene terephthalate Polymers 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 239000006249 magnetic particle Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229920000098 polyolefin Polymers 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 230000037303 wrinkles Effects 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- IUHFWCGCSVTMPG-UHFFFAOYSA-N [C].[C] Chemical group [C].[C] IUHFWCGCSVTMPG-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- H01L31/049—Protective back sheets
-
- 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)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The present invention provides a kind of TPT backboards, hot-press method and the hot-press equipment of photovoltaic cell, and the hot-press method comprises the following steps：(1) unreel：The TPT backboards are drawn to release from volume；(2) the pre-heat treatment：The TPT backboards are preheated, after preheating, the temperature of the TPT backboards is 140~160 DEG C；(3) hot-pressing processing：Hot pressing is carried out to the TPT backboards after preheating, the pressure being applied on the TPT backboards during hot pressing is 7~15kg/cm2, after hot pressing, the temperature of the TPT backboards is 230~246 DEG C；(4) cooling treatment：The TPT backboards after hot pressing are cooled down, after cooling, the temperature of the TPT backboards is 30~35 DEG C；(5) wind：The TPT backboards after cooling are wound.The peel strength of TPT backboards outer layer and intermediate layer can be enhanced to ＞ 40N/cm by the hot-press method.
Description
Technical Field
The invention relates to the technical field of photovoltaic cell manufacturing, in particular to a TPT back plate of a photovoltaic cell, a hot pressing method and hot pressing equipment.
Background
Solar energy is an inexhaustible clean energy source in the nature, and in recent years, the utilization of photoelectric conversion solar energy is well developed. Among them, a solar cell panel formed by combining photovoltaic cells has gradually become a mainstream technology in the photoelectric conversion market.
The existing photovoltaic cell is composed of glass, EVA, a silicon chip and a back plate, and is packaged according to the structure of glass-EVA-silicon chip-EVA-back plate. The backboard is located on the outermost layer of the back of the photovoltaic cell and is an important component of the photovoltaic cell, and not only plays a role in packaging, but also plays a role in ensuring that the photovoltaic cell is not influenced by the environment, so that the service life of the photovoltaic cell is ensured.
According to the material of the film used for the photovoltaic cell back plate, the back plate can be divided into a fluorine-containing back plate, a PET (polyethylene terephthalate) back plate, a Tedlar back plate and other back plate products made of PE (polyethylene) materials. The fluorine-containing back plate comprises back plates with FPF and FPE structures, and the PET back plate comprises back plates with full PET and PET/polyolefin structures. Wherein F is a fluorine-containing film; p is a polyethylene terephthalate film (namely a PET film) prepared by a biaxial stretching process; e is ethylene-vinyl acetate copolymer (i.e., EVA); polyolefin refers to various plastics having a carbon-carbon structure as a main chain. The structural layers are bonded by using an adhesive, and are prepared and molded by a composite process.
Currently, more photovoltaic cell back sheets adopt Tedlar back sheets, and a typical Tedlar back sheet is a back sheet of a TPT structure, namely a Tedlar/PET/Tedlar structure, wherein the Tedlar is a PVF (polyvinyl fluoride) film produced by dupont. Currently, most photovoltaic backplane markets are dominated by backplates based on Tedlar from dupont, the first product entering the photovoltaic market is PVF2001, and the Tedlar product from dupont has been developed for the third generation.
However, the interlayer peeling strength between the outer layer and the middle layer of the photovoltaic back sheet with the TPT structure produced by the prior art is usually 7N/cm, so that the service life of the photovoltaic back sheet is more than 20 years for better weather resistance, and the interlayer peeling strength cannot meet the requirement.
Disclosure of Invention
In view of the problems in the prior art, the invention aims to provide a hot-pressing method of a TPT back sheet of a photovoltaic cell, which can strengthen the peeling strength between the outer layer and the middle layer of the back sheet to be more than 40N/cm.
In order to achieve the above object, the present invention provides a method for hot-pressing a TPT backsheet for a photovoltaic cell, comprising the steps of:
(1) unreeling: drawing the TPT backsheet out of the roll;
(2) preheating treatment: preheating the TPT back plate, wherein the temperature of the TPT back plate is 140-160 ℃ after preheating;
(3) hot pressing treatment: carrying out hot pressing on the preheated TPT back plate, wherein the pressure applied to the TPT back plate in the hot pressing process is 7-15 kg/cm2The temperature of the TPT back plate is 230-246 ℃;
(4) cooling treatment: cooling the TPT back plate after hot pressing, wherein the temperature of the TPT back plate is 30-35 ℃ after cooling;
(5) winding: and rolling the cooled TPT back plate.
Preferably, in the step (3), the tension of the TPT back plate during hot pressing ranges from 160N to 220N.
Preferably, in the step (3), the TPT back plate is pressed with the pressing rubber roller through a matched hot pressing roller, and the wrap angle between the TPT back plate and the roller surface of the hot pressing roller is 0-270 degrees.
Preferably, in the step (2), the temperature of the TPT back plate reaches 140-160 ℃ after two times of preheating.
Preferably, in the step (2), after the first preheating, the temperature of the TPT back plate is 80-95 ℃, and after the second preheating, the temperature of the TPT back plate is 140-160 ℃.
Preferably, in the step (2), the tension range of the TPT back plate during the first preheating is 160-280N, and the tension range of the TPT back plate during the second preheating is 160-240N.
Preferably, in the step (2), the TPT back sheet is preheated by a first preheating roller and a second preheating roller respectively, and the wrap angles of the TPT back sheet and the roller surfaces of the first preheating roller and the second preheating roller are both 160-180 °.
Preferably, in the step (4), the TPT back sheet is cooled by a cooling roller, and the wrap angle of the TPT back sheet and the roller surface of the cooling roller is 320 °.
The invention also provides a TPT back sheet of the photovoltaic cell, wherein the TPT back sheet is prepared by the hot pressing method.
The invention further provides hot-pressing equipment for hot-pressing the TPT back plate of the photovoltaic cell, which comprises an unwinding mechanism, a preheating unit, a hot-pressing unit, a cooling unit and a winding mechanism which are sequentially arranged along the hot-pressing process, and the hot-pressing equipment also comprises a plurality of guide rollers positioned among the unwinding mechanism, the preheating unit, the hot-pressing unit, the cooling unit and the winding mechanism; wherein,
the preheating unit comprises a first preheating unit and a second preheating unit which are sequentially arranged along a hot pressing process, the first preheating unit and the second preheating unit respectively comprise a first preheating roller and a second preheating roller, roller body coatings of the first preheating roller and the second preheating roller are both hard chromium, the surface roughness of the first preheating roller is 0.01-0.03 mu m, and the surface roughness of the second preheating roller is 0.02-0.03 mu m;
the hot pressing unit comprises a hot pressing roller and a pressing rubber roller which are matched, a roller body coating of the hot pressing roller is hard chromium, and the surface roughness of the hot pressing roller is 0.04-0.05 mu m;
the cooling unit comprises a cooling roller, a roller body coating of the cooling roller is hard chromium, and the surface roughness of the cooling roller is 0.01-0.02 mu m.
Compared with the prior art, the TPT back plate, the hot pressing method and the hot pressing equipment of the photovoltaic cell provided by the invention at least have the following beneficial effects:
the TPT back plate is hot-pressed at 230-246 ℃, and the counter pressure of a hot-pressing unit is controlled to be 7-15 kg/cm2In the range, the Tedlar film on the outer layer of the TPT back sheet 1 is heated to the melting range, and is cooled and crystallized and shaped rapidly after being continuously rolled under the pressure, so that the peeling strength of the Tedlar film and the PET film is remarkably increased, and the peeling strength of the Tedlar film and the PET film can reach more than 40N/cm after being treated by the hot pressing method, so that the service life of the photovoltaic back sheet is more than 20 years.
Drawings
Fig. 1 is a flow chart of a method for hot pressing a TPT backsheet for a photovoltaic cell in accordance with an embodiment of the present invention;
fig. 2 is a schematic view of a thermal press apparatus for a TPT backsheet of a photovoltaic cell in accordance with one embodiment of the present invention;
fig. 3 is a schematic view of a thermal pressing apparatus for a TPT backsheet of a photovoltaic cell according to another embodiment of the present invention.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their repetitive description will be omitted.
The words expressing the position and orientation described in the present invention are illustrated in the accompanying drawings, but may be changed as required and are within the scope of the invention.
Referring to fig. 1, in one aspect, the present invention provides a method for hot-pressing a TPT backsheet of a photovoltaic cell, including the steps of: s11 unreeling, S12 preheating treatment, S13 hot pressing treatment, S14 cooling treatment and S15 reeling.
Referring to fig. 2 and 3, another aspect of the present invention provides a hot pressing apparatus applicable to the hot pressing method, including an unwinding mechanism 10, a preheating unit 20, a hot pressing unit 30, a cooling unit 40, and a winding mechanism 50, which are sequentially disposed along a hot pressing process, and the hot pressing apparatus further includes a plurality of guide rollers 60. The positions of the guide rollers 60 may need to be set, and are generally located between the unwinding mechanism 10, the preheating unit 20, the hot pressing unit 30, the cooling unit 40 and the winding mechanism 50.
The hot pressing method and the hot pressing apparatus of the present invention will be described in detail below with reference to the accompanying drawings.
S11 unreeling: the TPT backsheet 100 is drawn out of the roll.
In one embodiment, the TPT backplane 100 is unreeled by an unreeling mechanism 10, and the unreeling mechanism 10 may be an unreeling device. When unreeling, for preventing the condition such as fold, deformation from appearing in the TPT backplate 100, set up tension detection device (not shown) between unwinding mechanism 10 and preheating unit 20, detect the tension of TPT backplate 100 to control the tension of TPT backplate 100 in 160 ~ 300N within range.
S12 preheating treatment: preheating the TPT back plate 100, wherein the temperature of the TPT back plate 100 is 140-160 ℃ after preheating.
The temperature of the TPT back plate 100 is raised to 140-160 ℃ before hot pressing treatment through preheating, and the TPT material is heated more uniformly in the subsequent hot pressing process.
In a preferred embodiment, the temperature of the TPT backsheet 100 after two preheating processes reaches 140 to 160 ℃, preferably, the temperature of the TPT backsheet 100 after the first preheating process is 80 to 95 ℃, and the temperature of the TPT backsheet 100 after the second preheating process is 140 to 160 ℃.
In one embodiment, the TPT backsheet 100 is preheated by the preheating unit 20, in this embodiment, the preheating unit 20 includes a first preheating unit, and in a preferred embodiment, the preheating unit 20 further includes a second preheating unit (not shown) disposed along the hot pressing process and behind the first preheating unit. Wherein, after the first preheating unit preheats, the temperature of the TPT backboard 100 is 80-95 ℃, and after the second preheating unit preheats, the temperature of the TPT backboard 100 is 140-160 ℃. By arranging the first preheating unit and the second preheating unit, the preheating process of the TPT back sheet 100 is more uniform.
In one embodiment, the first preheating unit and the second preheating unit respectively include a first preheating roller and a second preheating roller, and further, the first preheating unit and the second preheating unit respectively further include a driving source, a fixed wrap angle roller, and a magnetic particle clutch (not shown), wherein the wrap angle of the TPT back plate 100 and the roller surfaces of the first preheating roller and the second preheating roller is 160 ° to 180 °, preferably 170 °.
The temperature of the TPT backsheet 100 after being preheated by the first preheating unit and the second preheating unit can be controlled by the wrap angle between the TPT backsheet 100 and the roll surfaces of the first preheating roll and the second preheating roll. Specifically, the wrap angle is a central angle corresponding to an arc where the TPT backsheet 100 contacts a roll surface, and the wrap angle reflects the contact area of the TPT backsheet 100 with the roll surfaces of the first preheating roll and the second preheating roll, and further reflects how much the TPT backsheet 100 is heated after being preheated by the first preheating roll and the second preheating roll, and the larger the wrap angle is, the higher the temperature of the TPT backsheet 100 is heated after being preheated by the first preheating roll and the second preheating roll.
In this embodiment, the wrap angles of the TPT back sheet 100 and the roll surfaces of the first preheating roll and the second preheating roll may be both greater than 160 ° and less than 180 °, and the inventor tests show that when the wrap angles of the TPT back sheet 100 and the roll surfaces of the first preheating roll and the second preheating roll are both 170 °, the preheating effect of the TPT back sheet 100 is optimal, wherein after being preheated by the first preheating unit, the temperature of the TPT back sheet 100 is 80-95 ℃, and after being preheated by the second preheating unit, the temperature of the TPT back sheet 100 is 140-160 ℃.
In one embodiment, the diameter of the roller bodies of the first and second preheating rollers is the same, and may be 500mm, for example. The roller body coatings of the first preheating roller and the second preheating roller can be hard chrome, and are subjected to electroplating and then fine grinding polishing treatment, wherein the surface roughness of the first preheating roller and the surface roughness of the second preheating roller are respectively 0.01-0.03 mu m and 0.02-0.03 mu m, the surface roughness of the first preheating roller is controlled to be favorable for the contact of the TPT back plate 100 and the first preheating roller, and the surface roughness of the second preheating roller is increased because the surface roughness is increased along with the increase of the preheating temperature to be favorable for preventing the adhesion of the TPT back plate 100 and the roller surface of the second preheating roller.
In one embodiment, the temperature gradient in the wide working area of the material of the first preheating roll is +/-1-2 ℃, the temperature of the roll surface is 90-105 ℃ (the temperature is independently controlled in the working area and the non-working area), the temperature gradient in the wide working area of the material of the second preheating roll is +/-1-2 ℃, the temperature of the roll surface is 150-170 ℃ (the temperature is independently controlled in the working area and the non-working area), and the heating powers of the roll bodies of the first preheating roll and the second preheating roll are respectively 56 kW.
In the preheating process, the tension of the TPT back panel 100 must be strictly controlled, otherwise, wrinkles, single-side tightness (i.e., tensile deformation) and the like may occur, and the inventors found that, when the tension range of the TPT back panel 100 preheated by the first preheating unit is 160 to 280N, and the tension range of the TPT back panel 100 preheated by the second preheating unit is 160 to 240N, the preheated TPT back panel 100 has no wrinkles and no deformation. In one embodiment, the tension of the TPT backsheet 100 as it passes through the first preheating unit and the second preheating unit is detected and controlled by providing tension detecting devices (not shown) between the first preheating unit and the second preheating unit, and between the second preheating unit and the hot press unit 30, respectively.
S13 heat pressing treatment: carrying out hot pressing on the preheated TPT back plate 100, wherein the pressure applied to the TPT back plate 100 in the hot pressing process is 7-15 kg/cm2The temperature of the TPT back plate 100 is 230-246 ℃.
The TPT back plate 100 is hot-pressed at 230-246 ℃, and the pressing pressure of the hot-pressing unit 30 is controlled to be 7-15 kg/cm2Within the range, the Tedlar film on the outer layer of the TPT back sheet 100 is heated to the melting range, and is cooled and crystallized and shaped rapidly after being continuously rolled under the pressure, so that the peeling strength of the Tedlar film and the PET film is remarkably increased, and the peeling strength of the Tedlar film and the PET film can reach more than 40N/cm after being treated by the hot pressing method, so that the service life of the photovoltaic back sheet is more than 20 years.
In one embodiment, the TPT backplane 100 is hot-pressed by a hot-pressing unit 30, and the hot-pressing unit 30 includes a hot-pressing roller 31 and a pressing rubber roller 32 which are matched with each other, and further includes a transmission source, a movable wrap angle adjusting mechanism and a pressing device (not shown), wherein the transmission source is a main speed source for the whole machine production. The wrap angle between the TPT back plate 100 and the roll surface of the hot pressing roll 31 is 0-270 degrees, preferably 15-120 degrees, and the wrap angle can be adjusted through the guide roll 60.
Specifically, at least two guide rollers 60 are provided around the hot press roller 31, and the wrap angle between the TPT backsheet 100 and the roll surface of the hot press roller 31 can be changed by changing the movement locus 61 of the guide rollers 60. Fig. 2 is a schematic diagram of a wrap angle of 0 °, and the TPT backplane 100 is preheated by the preheating unit 20 and then directly enters between the hot-pressing roller 31 and the pressing rubber roller 32 for pressing; fig. 3 is a schematic diagram of a wrap angle of about 270 °, and after being preheated by the preheating unit 20, the TPT backplane 100 is wrapped on the hot-pressing roller 31 under the guiding action of the two guide rollers 60, and then enters between the hot-pressing roller 31 and the pressing rubber roller 32 for pressing.
The temperature of the TPT back plate 100 after being preheated by the preheating unit 20 is about 140-160 ℃, and the temperature can be further increased before the TPT back plate 100 is hot-pressed by adjusting the wrap angle between the TPT back plate 100 and the roll surface of the hot pressing roll 31, so that the temperature of the Tedlar film of the TPT back plate 100 is within the melting range of the Tedlar film during hot pressing.
In the hot pressing process, in order to prevent the TPT backsheet 100 from wrinkling, deforming, and the like, the tension range of the TPT backsheet 100 when being hot pressed by the hot pressing unit 30 is 160 to 220N.
In one embodiment, the roll body coating of the hot press roll 31 is hard chromium, the surface roughness of the hard chromium is 0.04-0.05 μm after electroplating, fine grinding and polishing, and then sand spraying, and the adhesion between the TPT back plate 100 and the roll surface of the hot press roll 31 can be prevented by increasing the surface roughness. In order to prevent the TPT backsheet 100 from adhering to the roll surface of the hot-press roll 31, a method of providing a microporous structure on the roll surface of the hot-press roll 31 and penetrating anti-adhesion silicone oil into the microporous structure may be employed to achieve the anti-adhesion effect.
In one embodiment, the temperature gradient of the wide working area of the material of the hot press roll 31 is ± 1 to 2 ℃, the temperature of the roll surface is 240 to 255 ℃ (the temperature of the working area and the temperature of the non-working area are independently controlled), and the heating power of the roll body of the hot press roll 31 is 40 kW.
In a preferred embodiment, the first preheating unit, the second preheating unit, and the hot pressing unit 30 are all located in an insulation box, and by providing the insulation box, the heat dissipated from the surfaces of the preheating unit 20 and the hot pressing unit 30 into the air is effectively reduced, so that the energy consumption can be reduced, and meanwhile, the TPT backplane 100 can be ensured to have a proper preheating temperature before entering the hot pressing unit 30.
S14 cooling treatment: and cooling the TPT back plate 100 after hot pressing, wherein the temperature of the TPT back plate 100 is 30-35 ℃ after cooling.
In one embodiment, the TPT backsheet 100 is cooled by a cooling unit 40. After the TPT back plate 100 is continuously rolled at a high temperature of 230-246 ℃ by the hot pressing unit 30, the Tedlar film on the outer layer of the TPT back plate 100 is melted, and then is rapidly cooled to 30-35 ℃ by the cooling unit 40, and the Tedlar film is rapidly cooled, crystallized and shaped, so that the peeling strength between the Tedlar film and the PET film is remarkably increased.
In a preferred embodiment, the cooling unit 40 comprises a cooling roller, preferably a dewless cooling roller, further comprising a magnetic particle clutch and a tachometer (not shown). The wrap angle of the TPT backsheet 100 and the roll surface of the cooling roll is 320 °, the wrap angle is large, and the contact area of the TPT backsheet 100 and the cooling roll is increased by increasing the wrap angle, so that the Tedlar film on the outer layer of the TPT backsheet 100 can be rapidly cooled and crystallized and shaped. Preferably, the cooling roller has the same diameter as the roller body of the hot pressing roller 31 in the hot pressing unit 30, and in one embodiment, the cooling roller has a diameter of 500 mm.
In one embodiment, the roller body coating of the cooling roller is hard chromium, and the surface roughness of the roller body coating is 0.01-0.02 μm through electroplating and then fine grinding and polishing treatment.
In one embodiment, the cooling roller is kept at 3-6 ℃ by introducing cooling water, the temperature gradient in a wide working area of the material is +/-1-2 ℃, the roller surface temperature is 16-20 ℃, and the non-working area is 30-38 ℃, so that the temperature is higher than the normal dew point temperature.
In one embodiment, after the TPT back sheet 100 is cooled by the cooling unit 40, the tension range is controlled within a range of 160-300N, so as to prevent the TPT back sheet 100 from wrinkling, unilateral tightness and loose deformation.
S15: winding: the cooled TPT backsheet 100 is wound up.
In one embodiment, the TPT backsheet 100 is wound up by the winding mechanism 50, and the winding mechanism 50 may be a winding roller, and may further include a transmission source.
In one embodiment, a deviation detecting device 70 is further disposed between the winding mechanism 50 and the cooling unit 40 to prevent the TPT backsheet 100 from deviating during the transportation process.
While preferred embodiments of the present invention are described herein, these embodiments are provided by way of example only. It is to be understood that variations of the embodiments of the invention described herein may also be used in the practice of the invention. Those skilled in the art will appreciate that various modifications, changes, and substitutions can be made without departing from the scope of the invention. It should be understood that the scope of the various aspects of the invention is defined by the claims and that methods and structures within the scope of these claims and their equivalents are intended to be covered thereby.
Claims (10)
1. A hot-pressing method of a TPT back plate of a photovoltaic cell is characterized by comprising the following steps:
(1) unreeling: drawing the TPT backsheet out of the roll;
(2) preheating treatment: preheating the TPT back plate, wherein the temperature of the TPT back plate is 140-160 ℃ after preheating;
(3) hot pressing treatment: carrying out hot pressing on the preheated TPT back plate, wherein the pressure applied to the TPT back plate in the hot pressing process is 7-15 kg/cm2The temperature of the TPT back plate is 230-246 ℃;
(4) cooling treatment: cooling the TPT back plate after hot pressing, wherein the temperature of the TPT back plate is 30-35 ℃ after cooling;
(5) winding: and rolling the cooled TPT back plate.
2. The hot pressing method according to claim 1, wherein in the step (3), the TPT back sheet has a tension in a range of 160-220N during hot pressing.
3. The hot-pressing method according to claim 1, wherein in the step (3), the TPT back plate is pressed with the pressing rubber roller through a matched hot-pressing roller, and the wrap angle of the TPT back plate and the roller surface of the hot-pressing roller is 0-270 degrees.
4. The hot pressing method according to claim 1, wherein in the step (2), the temperature of the TPT back plate reaches 140-160 ℃ after two times of preheating.
5. The hot pressing method as claimed in claim 4, wherein in the step (2), the temperature of the TPT back sheet after the first preheating is 80-95 ℃, and the temperature of the TPT back sheet after the second preheating is 140-160 ℃.
6. The hot pressing method as claimed in claim 4, wherein in the step (2), the TPT back sheet has a tension in the range of 160 to 280N at the first preheating, and the TPT back sheet has a tension in the range of 160 to 240N at the second preheating.
7. The hot pressing method according to claim 4, wherein in the step (2), the TPT back sheet is preheated by a first preheating roller and a second preheating roller, respectively, and the wrap angles of the TPT back sheet and the roller surfaces of the first preheating roller and the second preheating roller are both 160 ° to 180 °.
8. The hot pressing method according to claim 1, wherein in the step (4), the TPT back plate is cooled by a cooling roller, and the wrap angle of the TPT back plate to the roller surface of the cooling roller is 320 °.
9. A TPT backsheet for a photovoltaic cell, wherein the TPT backsheet is produced by the hot pressing method according to any one of claims 1 to 8.
10. A hot-pressing device is used for hot-pressing a TPT back plate of a photovoltaic cell and is characterized by comprising an unwinding mechanism, a preheating unit, a hot-pressing unit, a cooling unit and a winding mechanism which are sequentially arranged along a hot-pressing process, and the hot-pressing device further comprises a plurality of guide rollers positioned among the unwinding mechanism, the preheating unit, the hot-pressing unit, the cooling unit and the winding mechanism; wherein,
the preheating unit comprises a first preheating unit and a second preheating unit which are sequentially arranged along a hot pressing process, the first preheating unit and the second preheating unit respectively comprise a first preheating roller and a second preheating roller, roller body coatings of the first preheating roller and the second preheating roller are both hard chromium, the surface roughness of the first preheating roller is 0.01-0.03 mu m, and the surface roughness of the second preheating roller is 0.02-0.03 mu m;
the hot pressing unit comprises a hot pressing roller and a pressing rubber roller which are matched, a roller body coating of the hot pressing roller is hard chromium, and the surface roughness of the hot pressing roller is 0.04-0.05 mu m;
the cooling unit comprises a cooling roller, a roller body coating of the cooling roller is hard chromium, and the surface roughness of the cooling roller is 0.01-0.02 mu m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610815397.9A CN107804054A (en) | 2016-09-08 | 2016-09-08 | TPT backboards, hot-press method and the hot-press equipment of a kind of photovoltaic cell |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610815397.9A CN107804054A (en) | 2016-09-08 | 2016-09-08 | TPT backboards, hot-press method and the hot-press equipment of a kind of photovoltaic cell |
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| Publication Number | Publication Date |
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| CN107804054A true CN107804054A (en) | 2018-03-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610815397.9A Pending CN107804054A (en) | 2016-09-08 | 2016-09-08 | TPT backboards, hot-press method and the hot-press equipment of a kind of photovoltaic cell |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108831943A (en) * | 2018-08-17 | 2018-11-16 | 北京铂阳顶荣光伏科技有限公司 | A kind of cornerite regulating mechanism |
| CN112299091A (en) * | 2019-07-29 | 2021-02-02 | 日东电工株式会社 | Glass substrate conveying device, laminated glass manufacturing device and manufacturing method |
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| CN102815070A (en) * | 2011-06-07 | 2012-12-12 | 杜邦公司 | Solar cell back panel with improved cohesive property on packing materials |
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| CN203192817U (en) * | 2013-01-30 | 2013-09-11 | 宁波长阳科技有限公司 | Solar cell backboard |
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| CN102815053A (en) * | 2011-06-07 | 2012-12-12 | 杜邦公司 | Solar cell back panel with improved cohesive property on packing materials |
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Application publication date: 20180316 |