CN107968132B - Method for testing bonding strength of aluminum back surface field and EVA adhesive film in photovoltaic module - Google Patents
Method for testing bonding strength of aluminum back surface field and EVA adhesive film in photovoltaic module Download PDFInfo
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- CN107968132B CN107968132B CN201710720946.9A CN201710720946A CN107968132B CN 107968132 B CN107968132 B CN 107968132B CN 201710720946 A CN201710720946 A CN 201710720946A CN 107968132 B CN107968132 B CN 107968132B
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- 239000002313 adhesive film Substances 0.000 title claims abstract description 128
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 83
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 82
- 238000012360 testing method Methods 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 38
- 239000002390 adhesive tape Substances 0.000 claims abstract description 39
- 238000003825 pressing Methods 0.000 claims abstract description 33
- 238000000926 separation method Methods 0.000 claims abstract description 28
- 239000011521 glass Substances 0.000 claims abstract description 22
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 14
- 239000010703 silicon Substances 0.000 claims abstract description 14
- 238000005520 cutting process Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims 1
- 239000005038 ethylene vinyl acetate Substances 0.000 abstract description 97
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 abstract description 97
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 abstract description 96
- 238000010248 power generation Methods 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 29
- 238000005259 measurement Methods 0.000 description 20
- 238000010998 test method Methods 0.000 description 12
- 230000008569 process Effects 0.000 description 9
- 239000002994 raw material Substances 0.000 description 8
- AZUYLZMQTIKGSC-UHFFFAOYSA-N 1-[6-[4-(5-chloro-6-methyl-1H-indazol-4-yl)-5-methyl-3-(1-methylindazol-5-yl)pyrazol-1-yl]-2-azaspiro[3.3]heptan-2-yl]prop-2-en-1-one Chemical compound ClC=1C(=C2C=NNC2=CC=1C)C=1C(=NN(C=1C)C1CC2(CN(C2)C(C=C)=O)C1)C=1C=C2C=NN(C2=CC=1)C AZUYLZMQTIKGSC-UHFFFAOYSA-N 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 230000001070 adhesive effect Effects 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 4
- 238000007718 adhesive strength test Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000010030 laminating Methods 0.000 description 3
- 238000004080 punching Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
- 238000010420 art technique Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000008719 thickening Effects 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
- H01L31/18—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
- H01L31/1804—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof comprising only elements of Group IV of the Periodic Table
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L22/00—Testing or measuring during manufacture or treatment; Reliability measurements, i.e. testing of parts without further processing to modify the parts as such; Structural arrangements therefor
- H01L22/10—Measuring as part of the manufacturing process
- H01L22/12—Measuring as part of the manufacturing process for structural parameters, e.g. thickness, line width, refractive index, temperature, warp, bond strength, defects, optical inspection, electrical measurement of structural dimensions, metallurgic measurement of diffusions
-
- 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
- Y02E10/547—Monocrystalline silicon PV cells
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Photovoltaic Devices (AREA)
Abstract
The invention provides a method for testing the bonding strength of an aluminum back surface field and an EVA (ethylene vinyl acetate) adhesive film in a photovoltaic module, and relates to the field of photovoltaic power generation. The method comprises the following steps: pressing the back plate, the first EVA adhesive film, the battery piece attached with the two adhesive tapes arranged at intervals, the second EVA adhesive film and the glass plate to obtain a photovoltaic module, wherein the first EVA adhesive film between the two adhesive tapes is an adhesive film to be tested, separating the back plate between the two adhesive tapes from the battery piece to obtain a separation back plate and an adhesive film to be tested attached to the separation back plate, and measuring the stripping force between the adhesive film to be tested and the separation back plate; the battery piece comprises a silicon layer and an aluminum back field attached to the silicon layer, the silicon layer is attached to the second EVA layer, the aluminum back field is attached to the first EVA adhesive film, and two adhesive tapes are attached to the aluminum back field before pressing. The method can accurately measure the bonding strength between the aluminum back surface field and the EVA adhesive film.
Description
Technical Field
The invention relates to the field of photovoltaic power generation, in particular to a method for testing the bonding strength of an aluminum back surface field and an EVA adhesive film in a photovoltaic module.
Background
The photovoltaic module is relatively complicated in the environmental conditions that faces in the outdoor use process, such as temperature change and wind speed change. In the process of environmental change, the changes of the photovoltaic module, such as thermal expansion and cooling, material deformation and the like, act between the EVA adhesive film and the aluminum back surface field in the photovoltaic module. Therefore, the bonding strength between the EVA adhesive film and the aluminum back surface field is very important.
At present, the adhesion performance between the EVA adhesive film and the aluminum back is measured, and the reliability of the EVA adhesive film and the aluminum back is judged by detecting the peel strength (namely the peel force) between the EVA adhesive film and the aluminum back. The prior method comprises the following steps: sequentially placing glass, an EVA (ethylene vinyl acetate copolymer) adhesive film, a battery piece, an EVA adhesive film and a back plate, and then laminating; after lamination, the backsheet was scribed at two slits spaced 10mm apart, and the EVA film was peeled off in the area between the two slits and its peel force was measured.
To make matters worse, the above method has problems that:
when the back plate is divided into two seams with the interval of 10mm, if the back plate is excessively stressed, the battery piece is damaged, the crack of the fragile battery piece can be expanded to the battery piece between the two seams, so that the effective test area of the EVA and the aluminum back surface field is far smaller than 10mm, and the test result is seriously low; if the force is small, the back plate and the EVA adhesive film cannot be cut through, so that the EVA adhesive film of the tested area is not completely separated from the peripheral EVA adhesive film, and in the stripping process, the test value is very large because the test value comprises the tearing force between the EVA and the EVA, and the bonding performance between the EVA and the aluminum back surface field cannot be measured.
It can be seen that the repeatability of the data detected by the current detection method is poor, an accurate value cannot be measured, and the adhesive property cannot be judged.
In addition, the existing improvements mainly focus on thickening the EVA adhesive film, cutting force and cutting speed, etc., and the above problems cannot be changed by improving the parameters.
Disclosure of Invention
The invention aims to provide a method for testing the bonding strength between an aluminum back field and an EVA adhesive film in a photovoltaic module. Two adhesive tapes which are arranged at intervals are attached to the aluminum back surface field of the battery piece, so that the condition that when the back plate and the battery piece are separated, the crack of the battery piece is cut and expanded to the area to be tested to damage the adhesive film to be tested and influence the test result is avoided; the problem that the first EVA adhesive film is not sufficiently scratched to cause tearing in the stripping process of the EVA adhesive film and the back plate and influence the test result is avoided; and the situation that the first EVA adhesive film between the back plate and the battery piece is directly used for measurement to influence the test result is avoided.
The technical problem to be solved by the invention is realized by adopting the following technical scheme.
The invention provides a method for testing the bonding strength of an aluminum back surface field and an EVA adhesive film in a photovoltaic module, which comprises the following steps:
pressing the back plate, the first EVA adhesive film, the battery piece attached with the two adhesive tapes arranged at intervals, the second EVA adhesive film and the glass plate to obtain a photovoltaic module, wherein the first EVA adhesive film between the two adhesive tapes is an adhesive film to be tested, separating the back plate between the two adhesive tapes from the battery piece to obtain a separation back plate and an adhesive film to be tested attached to the separation back plate, and measuring the stripping force between the adhesive film to be tested and the separation back plate;
the battery piece comprises a silicon layer and an aluminum back field attached to the silicon layer, the silicon layer is attached to the second EVA layer, the aluminum back field is attached to the first EVA adhesive film, and two adhesive tapes are attached to the aluminum back field before pressing.
The embodiment of the invention has the beneficial effects that:
according to the method for testing the bonding strength of the aluminum back field and the EVA adhesive film in the photovoltaic module, the bonding strength between the aluminum back field and the EVA adhesive film can be accurately measured. Two adhesive tapes arranged at intervals are attached to the aluminum back surface field of the battery piece:
on one hand, the condition that the crack of the battery piece is scratched to expand towards the area to be tested to damage the adhesive film to be tested and influence the test result when the back plate and the battery piece are separated is avoided; the problem that the first EVA adhesive film is not sufficiently scratched to cause tearing in the stripping process of the EVA adhesive film and the back plate and influence the test result is avoided; and the situation that the first EVA adhesive film between the back plate and the battery piece is directly used for measurement to influence the test result is avoided.
On the other hand, the size of the area to be measured is determined through the adhesive tape, and the size of the adhesive film to be measured is favorably controlled.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a photovoltaic module according to an embodiment of the present invention from a first viewing angle;
fig. 2 is a schematic structural diagram of a battery cell according to an embodiment of the invention;
FIG. 3 is a schematic structural diagram of a backplane according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a backplane separated from a region to be tested according to an embodiment of the present invention;
fig. 5a is a schematic structural diagram of a backplane separated from a region to be tested according to embodiment 1b of the present invention;
FIG. 5b is a graph of the bond strength test results provided in example 1b of the present invention;
FIG. 6a is a schematic structural diagram of a first prior art in which a back plate of an EVA adhesive film is not cut away and a region to be tested is separated;
FIG. 6b is a graph showing the results of a bond strength test provided by the first prior art;
fig. 7a is a schematic structural diagram of a second prior art method for separating a back plate of a split cell from a region to be tested;
FIG. 7b is a graph showing the results of a bond strength test provided by a second prior art technique;
icon: 100-a photovoltaic module; 110-a back-plate; 111-a first end portion; 112-a second end; 113-a separate back plate; 120-a first EVA adhesive film; 121-a glue film to be detected; 130-a battery piece; 131-a silicon layer; 132-aluminum back field; 133-back electrode; 134-area to be tested; 140-a second EVA adhesive film; 150-a glass plate; 160-adhesive tape; 161-a first tape; 162-a second tape; 170-opening; 171-a first opening; 172-second opening.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The following specifically describes a method for testing the adhesive strength between an aluminum back surface field and an EVA adhesive film in a photovoltaic module according to an embodiment of the present invention.
A method for testing the bonding strength of an aluminum back surface field and an EVA adhesive film in a photovoltaic module comprises the following steps:
referring to fig. 1, a photovoltaic module 100 includes a back plate 110, a first EVA film 120, a battery sheet 130, a second EVA film 140, and a glass plate 150, which are sequentially disposed.
The cell 130 includes a silicon layer 131, an aluminum back surface field 132 attached to the silicon layer 131, and a back electrode 133 disposed on the aluminum back surface field 132 and electrically connected to the silicon layer 131. The back electrode 133 is used to be electrically connected to a bus bar (not shown) for outputting electrical energy to the outside of the photovoltaic module 100, and the back electrode 133 and the bus bar are well known in the art and will not be described herein.
Wherein, the silicon layer 131 is attached to the second EVA adhesive film 140; the aluminum back surface field 132 is attached to the first EVA film 120.
Referring to fig. 2, two parallel tapes 160, specifically a first tape 161 and a second tape 162, are attached to the aluminum back surface field 132 at intervals. A region to be measured 134 is formed between the first tape 161 and the second tape 162, and the adhesive film 121 to be measured in the region to be measured 134 is used for measuring the bonding strength.
Wherein, the distance between the first tape 161 and the second tape 162 is X1, preferably 10-20 mm X1. That is, the distance between the two tapes 160 is 10 to 20 mm.
It can be understood that the first EVA adhesive film 120 between the first adhesive tape 161 and the second adhesive tape 162 is the adhesive film 121 to be tested, and is used for testing the bonding strength.
Preferably, the distance X1 between the first tape 161 and the second tape 162 is 10 mm. By controlling the range of the X1, the peeling force of the adhesive film 121 to be measured can be conveniently measured.
Further, the lengths of the first tape 161 and the second tape 162 are equal, i.e., Y1. Y1 is preferably 100 mm. By controlling the length of the adhesive tape 160, the length of the region to be measured 134 is controlled, so that the measurement of the peeling force of the prepared adhesive film to be measured 121 is facilitated, and the measurement accuracy is ensured.
As described above, the adhesive tapes 160 are attached to the two sides of the region to be measured 134, so that the size of the adhesive film to be measured 121 can be accurately controlled. Meanwhile, the non-adhesiveness between the tapes 160 through the first EVA film 120 facilitates the separation between the first EVA film 120 and the battery sheet 130.
The back sheet 110 includes a first end surface and a second end surface which are oppositely disposed, wherein the first end surface is attached to the first EVA film 120, and the second end surface is an outer surface of the photovoltaic module 100.
Referring to fig. 3, two openings 170, namely a first opening 171 and a second opening 172, are cut in the area of the back plate 110 corresponding to the first tape 161 and the second tape 162. The first opening 171 corresponds to the first tape 161, and the second opening 172 corresponds to the second tape 162.
The distance between the first opening 171 and the second opening 172 is X2, preferably 15-25 mm X2. That is, the distance between the two openings 170 is 15 to 25 mm.
Preferably, the distance X2 between the first opening 171 and the second opening 172 is 20 mm. By controlling the range of X2, separation of the back plate 110 from the battery sheet 130 between the first opening 171 and the second opening 172 is facilitated.
The first and second openings 171 and 172 are located on both sides of the first and second tapes 161 and 162, respectively. For example, if X1 is 10mm and X2 is 20mm, the first opening 171 is opposite to the tape body of the first tape 161 and is 5mm away from the end of the first tape 161 close to the region 134 to be measured; the second opening 172 is opposite to the body of the second tape 162 and is 5mm away from the end of the second tape 162 near the region 134 to be measured.
Further, the lengths of the first opening 171 and the second opening 172 are equal, i.e., Y2. Y2 is preferably 150 mm. Preferably, the length of Y2 beyond Y1 is equally distributed on both sides of tape 160, and it is understood that the length of the first opening 171 beyond the first tape 161 on one side is 25mm and the length of the first opening beyond the first tape 161 on the other side is 25 mm.
It is understood that the back plate between the first opening 171 and the second opening 172 is the separation back plate 113. The separation back plate 113 and the adhesive film 121 to be tested positioned between the first adhesive tape 161 and the second adhesive tape 162 are simultaneously separated from the aluminum back surface field 132, and are used for reflecting the bonding strength of the aluminum back surface field 132 and the first EVA adhesive film 120 through the peeling force of the adhesive film 121 to be tested and the separation back plate 113.
In summary, by providing the two openings 170, and the widths of the two openings 170 are greater than the widths of the two tapes 160 and the lengths of the two openings 170 are greater than the lengths of the two tapes 160, on one hand, it is avoided that the knife edge is shifted and the adhesive film 121 to be tested attached to the back plate 110 is damaged when the first EVA layer is cut in the separation process of the back plate 110 and the battery piece 130. On the other hand, since the width and the length between the two openings 170 are both greater than the width and the length between the two tapes 160, even if the battery piece 130 is cut by the knife edge and a crack is generated, the crack cannot be expanded to the region to be detected 134 under the protection of the tapes 160 to damage the adhesive film to be detected 121, thereby improving the accuracy of the detection result.
The back sheet 110 with the cut-out opening 170, the first EVA film 120, the battery sheet 130 with the adhesive tape 160 attached, the second EVA film 140, and the glass plate 150 are made into the photovoltaic module 100.
Specifically, the back sheet 110, the first EVA film 120, the battery sheet 130, the second EVA film 140, and the glass sheet 150 are pressed in a laminator. Specifically, the interior of a laminating machine is vacuumized, the pressing temperature is 130-140 ℃, the pressing pressure is-15 to-45 KPa, and the pressing time is 10-20 min.
The back sheet 110 is separated from the battery sheet 130. The back plate 110 includes a first end portion 111 and a second end portion 112 disposed opposite to each other, and an extending direction of the opening 170 intersects with an extending direction of the first end portion 111 and an extending direction of the second end portion 112.
In one implementation of the present invention, the pressed first EVA film 120 is scribed along the extending direction of the first opening 171 and the second opening 172, and one end of the first opening 171 and one end of the second opening 172 are extended to the first end 111 of the back plate 110. The first end portion 111 drives the separation back plate 113 located in the region 134 to be measured to move towards the second end portion 112, that is, the separation back plate 113 and the battery piece 130 are reversely separated. The film 112 to be tested in the pressed first EVA film 120 is attached to the separating back plate 113.
In another implementation of the present invention, the pressed first EVA film 120 and the battery sheet 130 are scribed along the extending direction of the first opening 171 and the second opening 172, that is, the scratches of the battery sheet 130 can be observed through the glass plate 150, and one end of the first opening 171 and one end of the second opening 172 are extended to the first end 111 of the back plate 110. The separation back plate 113 located in the region to be tested 134 is driven by the first end 111 to move towards the second end 112, that is, the separation back plate 113 and the battery piece 130 are reversely separated, and the to-be-tested adhesive film 121 in the pressed first EVA adhesive film 120 is attached to the back plate 110.
As the first EVA film 120 is not bonded to the first adhesive tape 161 and the second adhesive tape 162 after being positioned on the two sides of the region 134 to be measured and positioned on the first adhesive tape 161 and the second adhesive tape 162 after being pressed, the damage to the adhesive film 121 to be measured is avoided in the separation process of the separation back plate 110 and the battery piece 130, and the accuracy of the measurement result is further ensured.
The peel force between the adhesive film 121 to be tested and the separation back plate 113 is measured. The adhesive film 121 to be tested is peeled off from one end of the separating back plate 113, and moves towards the other end opposite to the end at a speed of 50-500 mm/min, so that the adhesive film 121 to be tested is peeled off reversely, and the peeling force is measured in the peeling process.
Specifically, after one end of the adhesive film 121 to be tested is punched by using a punching machine, a rope is used to penetrate through the hole and is fixed to the tension meter, and the other end of the adhesive film 121 to be tested and the separation back plate 113 are fixed to a clamp of the tension meter. And (3) operating the tension meter at the speed of 50-500 mm/min, wherein the degree of the tension meter is the magnitude of the peeling force, namely the bonding strength test result.
As described above, two tapes 160 are attached to the aluminum back surface field 132 of the battery piece 130 at intervals. On the one hand, when the separation back plate 113 and the battery piece 130 are separated, and the first EVA film 120 is scratched along the opening 170, the situation that the crack of the scratched battery piece 130 expands to the region to be measured 134, which affects the adhesive film to be measured 121 and thus causes the measurement result of the adhesive strength to be low is avoided.
On the other hand, the size of the region 134 to be measured is determined by the adhesive tape 160, so that the size of the adhesive film 121 to be measured is controlled, the problem that the measurement result is higher due to the fact that the first EVA adhesive film 120 between the back plate 110 and the battery piece 130 is directly used for measurement is avoided, and the problem that the measurement result is higher due to the fact that the first EVA adhesive film 120 and the battery piece 130 are torn in the glass process is also avoided.
The features and properties of the present invention are described in further detail below with reference to examples.
Example 1
And (4) selecting raw materials. Back plate 110: middle day KPO back sheet with thickness of 0.35mm, first EVA adhesive film 120: heyday EVA with a thickness of 0.45mm, aluminum back surface field 132 of the cell sheet 130: 1 aluminum paste changed from Tiansheng K6W 7.
Example 1a
A first tape 161 and a second tape 162 each having a width of 10mm are attached to the aluminum back surface field 132 of the battery piece 130. The distance X1 between the first tape 161 and the second tape 162 is 10mm, and the length Y1 between the first tape 161 and the second tape 162 is 100 mm.
The first opening 171 and the second opening 172 are cut at the back plate 110 with a distance X2 of 20mm using a cutter, and the length of each of the first opening 171 and the second opening 172 is Y2 of 150 mm.
Laying a glass plate 150, a second EVA (ethylene vinyl acetate) adhesive film 140, a battery piece 130 attached with an adhesive tape 160, a first EVA adhesive film 120 and a back plate 110 in a laminating machine in sequence, wherein the adhesive tape 160 faces the first EVA120 adhesive film, a first opening 171 corresponds to the position of a first adhesive tape 161, a second opening 172 corresponds to the position of a second adhesive tape 162, vacuumizing for 6min, and pressing at 140 ℃ and-45 KPa for 16min to obtain the photovoltaic module 100.
When the photovoltaic module 100 is cooled to 20-25 ℃, the back plate 110 is cut to the first end portion 111 of the back plate by using a cutter along the extending direction of the first opening 171 and the extending direction of the second opening 172, and the pressed first EVA adhesive film 120 is cut by the cutter at the same time.
After the separation back plate 113 between the first and second slits 171 and 172 is separated from the battery piece 130 from the first end 111 at a speed of 50 mm/min.
After punching one end of the adhesive film 121 to be tested by using a puncher, punching a hole by using a rope, and then fixing the hole at one end of a tension meter; the other end of the adhesive film 121 to be tested and the separation back plate 113 are fixed in a clamp of the tension meter; and (4) operating the tension meter at the speed of 50mm/min, and reading the degree of the tension meter, namely the bonding strength.
Example 1b
Example 1b operates substantially the same as example 1a, except that the present embodiment cuts the back sheet 110 to the first end 111 thereof using a cutter in both the extending direction of the first opening 171 and the extending direction of the second opening 172, and at the same time, the cutter cuts the pressed first EVA film 120 and the battery sheet 130.
Comparative example 1
Comparative example 1a
The back plate 110 is not scribed with the first and second openings 171 and 172 before pressing. Meanwhile, the first tape 161 and the second tape 162 are not attached to the aluminum back surface field 132, and the rest of the operation is the same as that of the embodiment 1 a.
Comparative example 1b
The back plate 110 is not scribed with the first and second openings 171 and 172 before pressing. Meanwhile, the first tape 161 and the second tape 162 are not attached to the aluminum back surface field 132, and the rest of the operation is the same as that of the embodiment 1 b.
The separated back plate 110 of example 5b is shown in FIG. 5a, and the test result of the adhesive film 121 to be tested is shown in FIG. 5 b. It can be seen from fig. 5b that the test curve has small fluctuation and the test value is relatively accurate.
The separated back plate 110 of comparative example 1a is shown in FIG. 6a, and the test result of the adhesive film 121 to be tested is shown in FIG. 6 b. As can be seen from fig. 6b, the test curve has a large fluctuation and the overall measurement result is higher, which indicates that the test value is larger due to the fact that the glass adhesive film 121 to be tested and the first EVA adhesive film 120 around the glass adhesive film 121 are not completely cut, and therefore, the accuracy of the measurement value is poor.
The separated back plate 110 of comparative example 1b is shown in FIG. 7a, and the test result of the adhesive film 121 to be tested is shown in FIG. 7 b. Fig. 7b shows that the test curve has large fluctuation and the overall measurement result is low, which indicates that the crack generated by the cut cell 130 affects the adhesive film 121 to be tested, resulting in a severely low test value, and thus the accuracy of the measurement value is poor.
Example 2
And (4) selecting raw materials. Back plate 110: middle day KPO back sheet with thickness of 0.35mm, first EVA adhesive film 120: heyday EVA with a thickness of 0.45mm, aluminum back surface field 132 of the cell sheet 130: 1 aluminum paste changed from Tiansheng K6W 7.
Example 2a
The bonding strength test method of example 2a is substantially the same as the bonding strength test method of example 1a, except that the pressing pressure of the present example is-30 KPa, and the glass speed of the adhesive film 121 to be tested and the back plate 110 is 300 mm/min.
Example 2b
The bonding strength test method of example 2b is substantially the same as the bonding strength test method of example 1b, except that the pressing pressure of the present example is-30 KPa, and the glass speed of the adhesive film 121 and the back plate 110 to be tested is 300 mm/min.
Comparative example 2
Comparative example 2a
The back plate 110 is not scribed with the first and second openings 171 and 172 before pressing. Meanwhile, the first tape 161 and the second tape 162 are not attached to the aluminum back surface field 132, and the rest of the operation is the same as that of the embodiment 2 a.
Comparative example 2b
The back plate 110 is not scribed with the first and second openings 171 and 172 before pressing. Meanwhile, the first tape 161 and the second tape 162 are not attached to the aluminum back surface field 132, and the rest of the operation is the same as that of the embodiment 2 b.
Example 3
And (4) selecting raw materials. Back plate 110: middle day KPO back sheet with thickness of 0.35mm, first EVA adhesive film 120: heyday EVA with a thickness of 0.45mm, aluminum back surface field 132 of the cell sheet 130: 1 aluminum paste changed from Tiansheng K6W 7.
Example 3a
The bonding strength test method of example 3a is substantially the same as the bonding strength test method of example 1a, except that the pressing pressure is-15 KPa, and the glass speed of the adhesive film 121 and the back plate 110 is 500 mm/min.
Example 3b
The bonding strength test method of example 3b is substantially the same as the bonding strength test method of example 1b, except that the pressing pressure is-15 KPa and the glass speed of the adhesive film 121 and the back plate 110 is 500 mm/min.
Comparative example 3
Comparative example 3a
The back plate 110 is not scribed with the first and second openings 171 and 172 before pressing. Meanwhile, the first tape 161 and the second tape 162 are not attached to the aluminum back surface field 132, and the rest of the operation is the same as that of the embodiment 1 a.
Comparative example 3b
The back plate 110 is not scribed with the first and second openings 171 and 172 before pressing. Meanwhile, the first tape 161 and the second tape 162 are not attached to the aluminum back surface field 132, and the rest of the operation is the same as that of the embodiment 1 b.
Example 4
And (4) selecting raw materials. Back plate 110: middle day KPO back sheet with thickness of 0.35mm, first EVA adhesive film 120: heyday EVA with a thickness of 0.45mm, aluminum back surface field 132 of the cell sheet 130: 1 aluminum paste changed from Tiansheng K6W 7.
Example 4a
The bonding strength test method of example 4a is substantially the same as the bonding strength test method of example 1b, except that the pressing pressure of this example is-45 KPa, and the glass speed of the adhesive film 121 and the back plate 110 to be tested is 300 mm/min.
Example 4b
The bonding strength test method of example 4b is substantially the same as the bonding strength test method of example 1a, except that the pressing pressure of this example is-45 KPa, and the glass speed of the adhesive film 121 and the back plate 110 to be tested is 300 mm/min.
Comparative example 4
Comparative example 4a
The back plate 110 is not scribed with the first and second openings 171 and 172 before pressing. Meanwhile, the first tape 161 and the second tape 162 are not attached to the aluminum back surface field 132, and the rest of the operation is the same as that of the embodiment 4 a.
Comparative example 4b
The back plate 110 is not scribed with the first and second openings 171 and 172 before pressing. Meanwhile, the first tape 161 and the second tape 162 are not attached to the aluminum back surface field 132, and the rest of the operation is the same as that of the embodiment 4 b.
The results of the adhesive strength measurements of examples 1 to 4 and comparative examples 1 to 4 are shown in Table 1.
Table 1 bond strength test results
Example 5
And (4) selecting raw materials. Back plate 110: middle day KPO back sheet with thickness of 0.35mm, first EVA adhesive film 120: heyday EVA with a thickness of 0.45mm, aluminum back surface field 132 of the cell sheet 130: juxing 8256 aluminum paste.
The adhesive strength test method of example 5 is the same as that of example 1 a.
Comparative example 5
Comparative example 5a
The back plate 110 is not scribed with the first and second openings 171 and 172 before pressing. Meanwhile, the first tape 161 and the second tape 162 are not attached to the aluminum back surface field 132, and the rest of the operation is the same as that of embodiment 5.
Comparative example 5b
The back plate 110 is not scribed with the first and second openings 171 and 172 before pressing. Meanwhile, the first tape 161 and the second tape 162 are not attached to the aluminum back surface field 132, and the rest of the operation is the same as that of embodiment 5.
Example 6
And (4) selecting raw materials. Back plate 110: middle day KPO back sheet with thickness of 0.35mm, first EVA adhesive film 120: heyday EVA with a thickness of 0.45mm, aluminum back surface field 132 of the cell sheet 130: juxing 8256 aluminum paste.
The adhesive strength test method of example 6 is the same as that of example 2 a.
Comparative example 6
Comparative example 6a
The back plate 110 is not scribed with the first and second openings 171 and 172 before pressing. Meanwhile, the first tape 161 and the second tape 162 are not attached to the aluminum back surface field 132, and the rest of the operation is the same as that of embodiment 6.
Comparative example 6b
The back plate 110 is not scribed with the first and second openings 171 and 172 before pressing. Meanwhile, the first tape 161 and the second tape 162 are not attached to the aluminum back surface field 132, and the rest of the operation is the same as that of embodiment 6.
Example 7
And (4) selecting raw materials. Back plate 110: middle day KPO back sheet with thickness of 0.35mm, first EVA adhesive film 120: heyday EVA with a thickness of 0.45mm, aluminum back surface field 132 of the cell sheet 130: juxing 8256 aluminum paste.
The adhesive strength test method of example 7 is the same as that of example 3 a.
Comparative example 7
Comparative example 7a
The back plate 110 is not scribed with the first and second openings 171 and 172 before pressing. Meanwhile, the first tape 161 and the second tape 162 are not attached to the aluminum back surface field 132, and the rest of the operation is the same as that of example 7.
Comparative example 7b
The back plate 110 is not scribed with the first and second openings 171 and 172 before pressing. Meanwhile, the first tape 161 and the second tape 162 are not attached to the aluminum back surface field 132, and the rest of the operation is the same as that of example 7.
Example 8
And (4) selecting raw materials. Back plate 110: middle day KPO back sheet with thickness of 0.35mm, first EVA adhesive film 120: heyday EVA with a thickness of 0.45mm, aluminum back surface field 132 of the cell sheet 130: juxing 8256 aluminum paste.
The adhesive strength test method of example 8 is the same as that of example 4 a.
Comparative example 8
Comparative example 8a
The back plate 110 is not scribed with the first and second openings 171 and 172 before pressing. Meanwhile, the first tape 161 and the second tape 162 are not attached to the aluminum back surface field 132, and the rest of the operation is the same as that of embodiment 8.
Comparative example 8b
The back plate 110 is not scribed with the first and second openings 171 and 172 before pressing. Meanwhile, the first tape 161 and the second tape 162 are not attached to the aluminum back surface field 132, and the rest of the operation is the same as that of embodiment 8.
The results of the adhesive strength measurements of examples 5 to 8 and comparative examples 5 to 8 are shown in Table 2.
Table 2 bond strength test results
As can be further seen from tables 1 and 2, the adhesion strength test results of examples 1 to 8 are less in specific fluctuation among different implementation manners, and meanwhile, the detection results have higher accuracy compared with the corresponding comparative examples 1 to 8 in which the measurement structure is not smaller or higher.
In summary, in the method for testing the bonding strength between the aluminum back surface field and the EVA adhesive film in the photovoltaic module according to the embodiment of the invention, two tapes 160 arranged at intervals are attached to the aluminum back surface field 132 of the cell 130.
On one hand, when the back plate 110 and the battery piece 130 are separated, the crack of the battery piece 130 is cut and the to-be-tested area 134 is expanded to damage the to-be-tested adhesive film 121, so that the test result is not influenced; the situation that the first EVA adhesive film 120 is not sufficiently scratched to cause tearing in the peeling process of the EVA adhesive film and the back plate 110 and influence the test result is avoided; and the situation that the first EVA adhesive film 120 between the back plate 110 and the battery piece 130 is directly used for measurement to influence the test result is also avoided.
On the other hand, the size of the region 134 to be measured is determined by the adhesive tape 160, so that the size of the adhesive film 121 to be measured is controlled, the problem that the measurement result is higher due to the fact that the first EVA adhesive film 120 between the back plate 110 and the battery piece 130 is directly used for measurement is avoided, and the problem that the measurement result is higher due to the fact that the first EVA adhesive film 120 and the battery piece 130 are torn in the glass process is also avoided.
The embodiments described above are some, but not all embodiments of the invention. The detailed description of the embodiments of the present invention is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Claims (10)
1. A method for testing the bonding strength of an aluminum back surface field and an EVA adhesive film in a photovoltaic module is characterized by comprising the following steps:
pasting the two adhesive tapes on an aluminum back surface field of the battery piece at intervals, cutting two openings on the back plate, wherein each opening corresponds to the position of each adhesive tape one by one;
pressing the back plate with the two openings, a first EVA adhesive film, the battery piece attached with the two adhesive tapes arranged at intervals, a second EVA adhesive film and a glass plate to obtain the photovoltaic module, wherein the first EVA adhesive film between the two adhesive tapes is an adhesive film to be tested, separating the back plate between the two adhesive tapes from the battery piece to obtain a separation back plate and the adhesive film to be tested attached to the separation back plate, and measuring the stripping force between the adhesive film to be tested and the separation back plate;
the battery piece comprises a silicon layer and an aluminum back field attached to the silicon layer, the silicon layer is attached to the second EVA adhesive film, the aluminum back field is attached to the first EVA adhesive film, and the two adhesive tapes are attached to the aluminum back field before pressing.
2. The method for testing the bonding strength of the aluminum back surface field and the EVA adhesive film in the photovoltaic module according to claim 1, wherein two openings penetrating through two surfaces of the back sheet are cut in the area of the back sheet corresponding to each adhesive tape before pressing.
3. The method for testing the bonding strength of the aluminum back surface field and the EVA adhesive film in the photovoltaic module according to claim 2, wherein the distance between two adjacent openings is greater than the distance between two adhesive tapes.
4. The method for testing the bonding strength of the aluminum back surface field and the EVA adhesive film in the photovoltaic module according to claim 3, wherein the two openings are distributed on two sides of the two adhesive tapes.
5. The method for testing the bonding strength of the aluminum back surface field and the EVA adhesive film in the photovoltaic module as claimed in claim 4, wherein an end of each opening extends to an end of the back sheet, and the back sheet between two openings is separated from the cell sheet along the end of the back sheet.
6. The method for testing the bonding strength between the aluminum back surface field and the EVA adhesive film in the photovoltaic module as claimed in claim 2, wherein each opening penetrates through the first EVA adhesive film along the direction from the back sheet to the glass sheet.
7. The method for testing the bonding strength between the aluminum back surface field and the EVA adhesive film in the photovoltaic module according to claim 2, wherein each opening sequentially penetrates through the first EVA adhesive film and the cell piece along the direction from the back plate to the glass plate.
8. The method for testing the bonding strength of the aluminum back surface field and the EVA adhesive film in the photovoltaic module according to claim 1, wherein the separation back sheet is separated from the cell sheet at a speed of 50-500 mm/min.
9. The method for testing the bonding strength of the aluminum back surface field and the EVA adhesive film in the photovoltaic module according to claim 1, wherein the adhesive film to be tested and the separation back plate are subjected to the peeling force test at a speed of 50-500 mm/min.
10. The method for testing the bonding strength of the aluminum back surface field and the EVA adhesive film in the photovoltaic module according to any one of claims 2 to 9, wherein the length of the opening is greater than the length of the adhesive tape.
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| CN113670815B (en) * | 2021-10-22 | 2022-02-18 | 南京日托光伏新能源有限公司 | Tensile test method for solder paste and core plate of MWT component |
| CN114235682B (en) * | 2021-12-27 | 2022-06-21 | 南京日托光伏新能源有限公司 | Method for testing surface coating bonding force of electroplated metal foil for MWT battery pack |
| CN114512561B (en) * | 2022-01-28 | 2024-02-27 | 东方日升新能源股份有限公司 | Method for testing bonding strength of photovoltaic laminated sample, battery piece and adhesive film |
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| KR20120033170A (en) * | 2010-09-29 | 2012-04-06 | 한국에너지기술연구원 | Apparatus for measuring adhesive strength of a photovoltaic module |
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| CN102854133B (en) * | 2011-06-30 | 2014-07-30 | 浙江瑞翌新材料科技有限公司 | Detection method for resin bonding strength |
| CN103094416B (en) * | 2013-01-21 | 2016-08-17 | 无锡中洁能源技术有限公司 | A kind of photovoltaic module production technology |
| CN105470329A (en) * | 2015-11-23 | 2016-04-06 | 浙江昱辉阳光能源江苏有限公司 | Double-glass high-conversion-power solar photovoltaic assembly |
| CN106340468B (en) * | 2016-11-01 | 2019-01-04 | 英利能源（中国）有限公司 | Solar double-glass assemblies EVA and glass adhesive property detection method |
| CN106784135A (en) * | 2016-11-30 | 2017-05-31 | 安徽振兴光伏新能源有限公司 | EVA peel strength test methods |
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| KR20100122636A (en) * | 2009-05-13 | 2010-11-23 | 연세대학교 산학협력단 | Method for testing adhesion strength of thin film formed on flexible substrate |
| KR20120033170A (en) * | 2010-09-29 | 2012-04-06 | 한국에너지기술연구원 | Apparatus for measuring adhesive strength of a photovoltaic module |
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