CN117347187B - Photovoltaic cell panel bending strength detection device and detection method - Google Patents
Photovoltaic cell panel bending strength detection device and detection method Download PDFInfo
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- CN117347187B CN117347187B CN202311648730.8A CN202311648730A CN117347187B CN 117347187 B CN117347187 B CN 117347187B CN 202311648730 A CN202311648730 A CN 202311648730A CN 117347187 B CN117347187 B CN 117347187B
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- 238000005452 bending Methods 0.000 title claims abstract description 118
- 238000001514 detection method Methods 0.000 title abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 36
- 238000012360 testing method Methods 0.000 claims abstract description 29
- 238000003825 pressing Methods 0.000 claims description 39
- 238000013001 point bending Methods 0.000 claims description 13
- 238000005096 rolling process Methods 0.000 claims description 10
- 238000005259 measurement Methods 0.000 abstract description 7
- 238000013461 design Methods 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 5
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- 239000011151 fibre-reinforced plastic Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 238000012935 Averaging Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
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- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000003698 laser cutting Methods 0.000 description 1
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- 229920003023 plastic Polymers 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0023—Bending
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- 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
Abstract
The invention relates to the field of bending strength detection, in particular to a device and a method for detecting bending strength of a photovoltaic cell panel. The photovoltaic cell panel bending strength detection device is used for realizing a photovoltaic cell panel bending strength detection method and specifically comprises a box body and a plurality of press rolls, wherein the press rolls are arranged in pairs, six groups are arranged, two press rolls in each group are vertically aligned, the six groups of press rolls are symmetrically distributed on two side walls of the width direction of the box body and are arranged at intervals in the length direction, and each press roll can rotate around the axis of the press roll and can move along the vertical direction and the length direction of the box body. According to the method for detecting the bending strength of the photovoltaic cell panel, under the condition that the bending strength of the photovoltaic cell panel sample measured according to the first crack is not in compliance with the requirement, the tests of the cracks with different lengths are carried out on the same photovoltaic cell panel sample, so that the same photovoltaic cell panel sample can be utilized to the maximum extent, multiple groups of measurement data can be obtained, and improvement suggestions are provided for the design of the photovoltaic cell panel.
Description
Technical Field
The invention relates to the field of bending strength detection, in particular to a device and a method for detecting bending strength of a photovoltaic cell panel.
Background
The bending test is a method for testing the bending strength and other important performances of materials, a three-point bending or four-point bending mode is often adopted in the related technology to place a sample on a bending device, the span between supporting points is adjusted, the sample is loaded for the bending test until the bending test reaches a specified bending degree or fracture and damage occurs, and the bending test can be used for testing the bending strength of materials such as plastics, fiber Reinforced Plastics (FRP), metals, ceramics and the like.
The photovoltaic cell panel is generally a solar photovoltaic cell, is a photovoltaic semiconductor sheet which directly generates electricity by utilizing sunlight, and is generally formed by laminating toughened glass, EVA (ethylene-vinyl acetate copolymer), cell pieces, a back plate, an aluminum alloy protection layer and the like, wherein the photovoltaic module is required to cut the original standard cell pieces into a plurality of small pieces by utilizing a laser cutting technology in the production process, so that the bending strength performance of the cell is influenced, and the breaking rate of a manufacturing link of the photovoltaic module is possibly caused. For example, chinese patent document CN 115248165B discloses a device for detecting bending strength of a photovoltaic cell, where two circular shafts are disposed below a photovoltaic panel, a pressing force is applied above the photovoltaic panel by a pressing structure, and the photovoltaic panel is bent and deformed under the guidance of the circular shafts, and the bending strength of the photovoltaic panel is detected and calculated according to deformation parameters. However, in the scheme, one photovoltaic cell panel can only perform one-time bending strength detection, the test data and the test form are single, the photovoltaic cell panel sample is wasted, and the data accuracy is low.
The information disclosed in the background section of this application is only for enhancement of understanding of the general background of this application and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
According to the defects of the prior art, the device and the method for detecting the bending strength of the photovoltaic cell panel are provided, multiple groups of test data can be obtained on one photovoltaic cell panel in various modes, the accuracy of test results is high, and the instruction significance of the test data is great.
The invention discloses a method for detecting bending strength of a photovoltaic cell panel, which adopts the following technical scheme: the method specifically comprises the following steps:
step S1, a first crack is obtained on a battery plate sample by utilizing a three-point bending method, the first crack is parallel to the wide side of the battery plate sample, and the first bending strength is calculated according to the first crack;
s2, if the first bending strength is unqualified, acquiring a second crack on the battery plate sample by using a three-point bending method, wherein the second crack and the broadside of the battery plate sample form a first included angle, and calculating the second bending strength according to the second crack;
s3, if the second bending strength is still not qualified, acquiring an N-th crack on the battery plate sample by using a three-point bending method, wherein the N-th crack and the broadside of the battery plate sample are arranged at an N-1-th included angle, the N-1-th included angle is larger than an N-2-th included angle, N is more than or equal to 3, and calculating the N-th bending strength according to the N-th crack;
wherein the first crack, the second crack and the Nth crack are mutually spaced and do not intersect in the length direction of the battery plate sample.
Optionally, there are a plurality of the first crack, the second crack, and the nth crack, and an average value is obtained according to the plurality of the obtained results.
Optionally, the plurality of first cracks are uniformly distributed along the length direction of the panel sample, and each second crack or nth crack is respectively located between two adjacent first cracks.
Optionally, when forming a second or nth crack between two adjacent first cracks, the bending direction of the panel sample is opposite to the bending direction when forming the first crack.
Alternatively, the panel samples were flattened after each run.
The device for detecting the bending strength of the photovoltaic cell panel is used for realizing the method for detecting the bending strength of the photovoltaic cell panel, and comprises a box body and a plurality of press rolls; the six groups of press rollers are symmetrically arranged on two side walls of the box body in the width direction and are arranged at intervals in the length direction, one ends, close to each other, of the two press rollers positioned on the same straight line are contacted, and a battery plate sample is clamped between the upper press rollers and the lower press rollers;
each press roller can rotate around the axis of the press roller and can move along the up-down direction and the length direction of the box body.
Optionally, the device for detecting the bending strength of the panel sample further comprises a first driving mechanism, a second driving mechanism and a third driving mechanism; the first driving mechanism is used for driving the press roller to rotate around the axis of the press roller, the second driving mechanism is used for driving the press roller to move up and down, and the third driving mechanism is used for driving the press roller to slide along the length direction of the box body.
Optionally, the first driving mechanism includes a first servo motor, and an output shaft of the first servo motor is connected with the press roller, so as to drive the press roller to rotate.
Optionally, the second actuating mechanism includes first electronic jar, and first electronic jar can be followed the length direction of box and slided and set up in the box, and the output of first electronic jar is connected with first servo motor, and then drives the compression roller and reciprocate.
Optionally, the third actuating mechanism includes second servo motor, rolling gear and fixed rack, and the second servo motor slides along the length direction of box and sets up in the box, and the output shaft of second servo motor is connected with first electronic jar relative rotation, and rolling gear cover locates the output shaft of second servo motor and rotates under the drive of second servo motor, and fixed rack sets up in the box and with rolling gear engagement.
The beneficial effects of the invention are as follows: according to the method for detecting the bending strength of the photovoltaic cell panel, provided by the invention, under the condition that the bending strength of the photovoltaic cell panel sample measured according to the first fracture is not in accordance with the requirement, the tests of the cracks with different lengths are carried out on the same photovoltaic cell panel sample, so that the same photovoltaic cell panel sample can be maximally utilized, multiple groups of measurement data can be obtained, and a guiding improvement suggestion is provided for the design of the photovoltaic cell panel in the future. According to the photovoltaic cell panel bending strength detection device, the press rollers can move relative to the panel sample, so that multi-position detection of the panel sample is realized, meanwhile, the press rollers can be independently controlled and rotate around the axis of the press rollers, so that rotation of the panel sample is realized, cracks with different lengths can be obtained on the panel sample, continuous automatic operation can be realized while the method is realized, operation is convenient and rapid, and efficiency is high.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art, it being understood that these drawings are not necessarily drawn to scale.
Fig. 1 is a schematic diagram of the overall structure of a photovoltaic cell panel bending strength detection device according to the present invention;
FIG. 2 is a cut-away perspective view of a photovoltaic panel bending strength detection apparatus of the present invention;
FIG. 3 is a front view of a photovoltaic panel bending strength detection apparatus of the present invention;
FIG. 4 is a cross-sectional view A-A of FIG. 3;
fig. 5 is a schematic structural diagram of a case in the photovoltaic cell panel bending strength detection device of the present invention;
fig. 6 is a schematic structural diagram of a hidden box in the photovoltaic cell panel bending strength detection device of the invention;
fig. 7 is a schematic structural diagram of a press roller, a first driving mechanism, a second driving mechanism and a third driving mechanism in the photovoltaic cell panel bending strength detection device;
FIG. 8 is an exploded view of FIG. 7;
FIG. 9 is a schematic diagram of a process of detecting bending strength by a photovoltaic panel bending strength detecting device;
FIG. 10 is a schematic illustration of a first fracture obtained on a panel sample;
FIG. 11 is a schematic illustration of a second fracture obtained on a panel sample;
fig. 12 is a schematic view of a third fracture obtained on a panel sample.
In the figure:
100. a case; 110. an upper cover; 120. a side plate; 130. a first chute; 140. a second chute;
200. a panel sample;
310. a second servo motor; 311. a second slider;
321. a fixed rack; 322. a third chute;
330. a rolling gear;
340. a first electric cylinder; 341. a first slider; 342. a sleeve;
350. a first servo motor; 353. a first straight rod;
360. and (3) a press roller.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the invention provides a method for detecting bending strength of a photovoltaic cell panel, which specifically comprises the following steps:
in step S1, a first crack is obtained on the panel sample 200 by using a three-point bending method, the first crack is parallel to the wide side of the panel sample 200, and the first bending strength is calculated according to the first crack, that is, the first bending strength is calculated according to the parameter obtained by obtaining the first crack.
Step S2, if the first bending strength is unqualified, obtaining a second crack on the panel sample 200 by using a three-point bending method, wherein the second crack is arranged at a first included angle with the wide side of the panel sample 200, and calculating the second bending strength according to the second crack;
s3, if the second bending strength is still not qualified, acquiring an N-th crack on the battery plate sample 200 by using a three-point bending method, wherein the N-th crack and the wide side of the battery plate sample 200 are arranged at an N-1-th included angle, the N-1-th included angle is larger than an N-2-th included angle, N is more than or equal to 3, and calculating the N-th bending strength according to the N-th crack; the first, second, and nth cracks are spaced apart from each other in the longitudinal direction of the panel sample 200 and do not intersect.
It can be understood that three-point bending is a stress structure for measuring bending strength, a sample is positioned between two lower rollers and an upper roller, the upper roller is positioned in the midspan, and the upper roller and the lower roller relatively move to bend the sample until the sample is cracked or broken; the calculation formula of the bending strength is as follows:
wherein,for the downward load, L is the span between the fulcra on both sides, b is the cross-sectional width of the specimen, and h is the specimen thickness.
It should be noted that, with the above method, when the obtained bending strength is not acceptable, the detection can be continued on the panel sample 200 until there is not enough space on the panel sample 200 for the next detection. It should be further explained that, the first crack is parallel to the broad side of the panel sample 200, the length of the first crack is the width of the panel sample 200, the second crack forms a first included angle with the broad side of the panel sample 200, and the length of the second crack is greater than the length of the first crack, so that the pressing load required for forming the second crack is greater than the pressing load required for forming the first crack; in the case where the bending strength calculated from the first crack (corresponding to the aforementioned first bending strength) is not satisfactory, if the bending strength measured from the second crack (corresponding to the aforementioned second bending strength) is satisfactory, increasing the width of the panel sample 200 to the width of the second crack is highly likely to make the bending strength of the panel sample 200 satisfactory; if the bending strength obtained according to the second crack is still not satisfactory, the third crack (corresponding to the nth crack) is obtained at a larger angle, and the length of the third crack is longer than the length of the second crack, and if the bending strength obtained according to the third crack (corresponding to the nth bending strength) is satisfactory, the width of the panel sample 200 is increased to the width of the third crack, so that the bending strength of the panel sample 200 is highly likely to be satisfactory. Similarly, when the bending strength of the panel sample 200 measured according to the first crack is not in accordance with the requirement, the test of the cracks with different lengths is performed on the same panel sample 200, so that the same panel sample 200 can be maximally utilized, multiple groups of measurement data can be obtained, and guiding improvement suggestions are provided for the design of the photovoltaic panel in the future.
Further, the first crack, the second crack and the nth crack may be provided with a plurality of cracks, and the average value is obtained according to the obtained results of the plurality of cracks, so that the measurement result is more accurate.
Further, a plurality of first cracks are uniformly distributed along the length direction of the panel sample 200, and each second crack or nth crack is respectively located between two adjacent first cracks. The arrangement enables bending detection to be performed on the same battery plate sample 200 as much as possible, so that as many cracks as possible are formed, and more reference data are obtained.
Further, when two adjacent cracks are formed, the bending directions of the panel samples 200 are opposite. By arranging the bending directions opposite, the influence of the formed cracks on the strength of the battery plate sample 200 is reduced as much as possible, so that the measurement result is more accurate.
Further, after each test, the panel test specimen 200 is flattened to facilitate the performance of subsequent tests.
Referring to fig. 1 to 12, the present invention further provides a device for detecting bending strength of a photovoltaic panel, which is used for implementing the method for detecting bending strength of a photovoltaic panel, and the device specifically includes a box 100 and a plurality of press rolls 360; the case 100 has a base, side plates 120 and an upper cover 110, the side plates 120 are located at two sides of the width direction of the base and are integrally formed with the base, the upper cover 110 and the side plates 120 are detachably connected, two ends of the case 100 in the length direction are opened, and the battery plate sample 200 is convenient to assemble and disassemble.
The press rolls 360 are arranged in pairs, six groups are arranged, all the press rolls 360 are horizontally arranged and extend along the width direction of the box body 100, the two press rolls 360 in each group are vertically aligned, the six groups of press rolls 360 are symmetrically distributed on two side walls of the box body 100 in the width direction and are arranged at intervals in the length direction, one ends, close to each other, of the two press rolls 360 positioned in the same straight line are contacted, and the battery plate sample 200 is clamped between the upper press rolls 360 and the lower press rolls 360; each of the pressing rollers 360 is rotatable about its own axis and movable in the up-down direction and the length direction of the casing 100.
In a further embodiment, the device for detecting bending strength of a panel sample 200 of the present invention further comprises a first driving mechanism, a second driving mechanism and a third driving mechanism; the first driving mechanism is used for driving the press roller 360 to rotate around the axis of the first driving mechanism, the second driving mechanism is used for driving the press roller 360 to move up and down, and the third driving mechanism is used for driving the press roller 360 to slide along the length direction of the box body 100.
Further, in the preferred embodiment of the present invention, the first driving mechanism includes a first servo motor 350, and an output shaft of the first servo motor 350 is connected to the pressing roller 360, so as to drive the pressing roller 360 to rotate.
The second driving mechanism comprises a first electric cylinder 340, the first electric cylinder 340 can be slidably arranged on the box body 100 along the length direction of the box body 100, and the output end of the first electric cylinder 340 is connected with a first servo motor 350 so as to drive a press roller 360 to move up and down. Naturally, the second driving mechanism may also be a driving element capable of realizing the same function, such as a pneumatic cylinder, a hydraulic cylinder, a linear motor, etc. A pressure sensor is installed between the first electric cylinder 340 and the first servo motor 350, and can detect the load applied by the first electric cylinder 340, and for the convenience of structural arrangement, the first servo motor 350 is provided with a first straight rod 353, the output end of the first electric cylinder 340 is connected with the first straight rod 353, and the pressure sensor is arranged between the output end of the first electric cylinder 340 and the first straight rod 353.
The third driving mechanism comprises a second servo motor 310, a rolling gear 330 and a fixed rack 321, the second servo motor 310 is slidably arranged on the box body 100 along the length direction of the box body 100, an output shaft of the second servo motor 310 is in relative rotation connection with the first electric cylinder 340, the rolling gear 330 is sleeved on the output shaft of the second servo motor 310 and rotates under the driving of the second servo motor 310, and the fixed rack 321 is arranged on the box body 100 and meshed with the rolling gear 330.
Further, for convenience of structural arrangement, a sleeve 342 is provided on the first electric cylinder 340, and an output shaft of the second servo motor 310 is rotatably connected with the sleeve 342. The box 100 is provided with a first chute 130 and a second chute 140 extending along the length direction of the box, an output shaft of the second servo motor 310 is slidably arranged on the first chute 130, a shell of the second servo motor 310 is slidably arranged on the second chute 140, specifically speaking, a second sliding block 311 is arranged on the shell of the second servo motor 310, the second sliding block 311 is slidably arranged on the second chute 140, and then the second servo motor 310 slides along the length direction of the box 100.
A third sliding groove 322 is formed in one side wall of the fixed rack 321, the third sliding groove 322 extends along the length direction of the box body 100, a first sliding block 341 is arranged on the first electric cylinder 340, the first sliding block 341 is arranged on the third sliding groove 322 in a sliding mode, and then the first electric cylinder 340 can slide along the length direction of the box body 100.
In combination with the above embodiment, the application principle and working process of the invention are as follows:
first cracks were obtained, and bending strength (corresponding to the first bending strength) was determined:
the panel test piece 200 is first inserted horizontally between the upper and lower press rolls 360 in the direction shown in fig. 2, and the long side of the panel test piece 200 is kept perpendicular to the press rolls 360, that is, the wide side of the panel test piece 200 is kept parallel to the press rolls 360.
Moving all the pressing rollers 360 up and down so that all the pressing rollers 360 contact the panel sample 200 to support the panel sample 200; then, the pressing rolls 360 are moved along the length direction of the case 100, so that all the pressing rolls 360 are positioned at one end of the panel sample 200, the span between the pressing rolls 360 positioned at both sides of all the pressing rolls 360 is L, the middle pressing roll 360 is positioned in the span, in the process of moving the pressing rolls 360, only two groups of pressing rolls 360 positioned at the same vertical plane can be moved once, the rest of the pressing rolls 360 support the panel sample 200, and in the moving process, the pressing rolls 360 actively rotate to reduce friction, so that the position of the panel sample 200 in the space is kept unchanged, and after the adjustment is completed, as shown in fig. 9 a.
Thereafter, all the pressing rolls 360 are adjusted to the state shown in fig. 9b to form the support points required for three-point bending, and fig. 9b shows that the upper mid-pressing roll 360 is lifted and the pressing rolls 360 on both sides of the lower part are lowered, and the remaining pressing rolls 360 are brought into contact with the panel sample 200 to form three-point support.
As shown in fig. 9c, the two pressing rolls 360, which are in contact with the panel sample 200 at the upper side, are kept stationary, and the pressing roll 360, which is in contact with the panel sample 200 at the lower side, is moved upward until a crack occurs at the upper side of the panel sample 200, and a pressure sensor is installed between the first electric cylinder 340 and the first servo motor 350, and the maximum load p applied by the lower pressing roll 360 during the press bending is recorded by the pressure sensor.
As shown in fig. 9d, all the pressing rollers 360 are reset, and during resetting of the pressing rollers 360, the three pressing rollers 360 in fig. 9b which are not in contact with the panel sample 200 flatten the bent portion of the panel sample 200. All the rolls 360 are then moved forward, as in fig. 9e, for the next test, the rolls 360 are moved a distance a >1.5L. The test is sequentially performed as described above until all bending is completed, and as shown in fig. 10, the broken line is a first crack formed by bending, and the length a of the first crack is equal to the width of the panel sample 200.
Calculating bending strength according to each first crack, averaging the bending strength obtained at all the first cracks, judging whether the bending strength meets the requirement, if so, the product is qualified, and if not, performing the next detection.
Obtaining a second crack, and judging the bending strength (corresponding to the second bending strength):
the panel sample 200 after the bending a plurality of times is reset to the initial state, and as shown in fig. 1 and 2, two sets of pressing rollers 360 at opposite angles are kept in contact with the panel sample 200, and the remaining four sets of pressing rollers 360 are away from the panel sample 200. The two sets of press rollers 360 are rotated in opposite directions so that the panel sample 200 is rotated by a certain angle α (referring to the direction in fig. 6, taking the case where the two sets of press rollers 360 in front left and rear right contact the panel sample 200, the set of press rollers 360 in rear right rotates to move the panel sample 200 to the right, the set of press rollers 360 in front left rotates to convey the panel sample 200 to the left, and the panel sample 200 will rotate clockwise, changing from fig. 10 to fig. 11). Thereafter, a new bending point is set between two adjacent first cracks, as shown in fig. 11, the area between two broken lines (i.e., two adjacent first cracks) is divided equally, the span between two pressing rollers 360, which are in contact with the panel sample 200 below, is still L, the contact length between the pressing rollers 360 and the panel sample 200 is b, and the width of the crack formed after bending is also b, b > a.
When the bending test is performed in the above-mentioned bending step, note that, when the second crack is obtained, the upper pressing roller 360 and the lower pressing roller 360 are away from the panel sample 200, and the upper pressing roller 360 and the lower pressing roller 360 are in contact with the panel sample 200, that is, the bending direction of the second crack is opposite to the bending direction of the first crack.
Calculating and judging that the bending strength is not in accordance with the requirement at the moment, if the bending strength is in accordance with the requirement, widening a to b can be proved to meet the requirement, so that guidance is provided for the design of the subsequent battery plate sample 200, and if the bending strength is not in accordance with the requirement, bending and resetting the battery plate sample. It can be appreciated that, under the angle of rotation α of the panel sample 200, a plurality of second cracks may be obtained by referring to the manner of obtaining the first cracks, and the bending strength of the plurality of second cracks is calculated and averaged, so that the result is more accurate, and only one second crack is shown in the figure.
A third crack (corresponding to the nth crack) was obtained, and the bending strength (corresponding to the nth bending strength) was determined:
further rotating the panel sample 200 to an angle β, testing the next bending point, as shown in fig. 12, to obtain a third crack, where the length of the third crack is c, c > b > a, γ=β - α, and calculating again and determining that the bending strength is not satisfactory, and if not, analogizing in the above manner, performing the next test until the panel sample 200 is tested.
Through the above, the photovoltaic cell panel bending strength detection device provided by the invention can be used for carrying out repeated continuous and automatic tests on one cell panel sample 200, is convenient to operate and high in efficiency, can be used for furthest utilizing the same test sample, can obtain various measurement data, can judge whether the design of the photovoltaic cell panel is reasonable according to the measurement data, and provides guidance for future design improvement.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (9)
1. The method for detecting the bending strength of the photovoltaic cell panel is characterized by adopting a device for detecting the bending strength of the photovoltaic cell panel, wherein the device for detecting the bending strength of the photovoltaic cell panel comprises a box body and a plurality of press rolls; the six groups of press rollers are symmetrically arranged on two side walls of the box body in the width direction and are arranged at intervals in the length direction, one ends, close to each other, of the two press rollers positioned on the same straight line are contacted, and a battery plate sample is clamped between the upper press rollers and the lower press rollers; each press roller can rotate around the axis of the press roller and can move along the up-down direction and the length direction of the box body;
the method for detecting the bending strength of the photovoltaic cell panel specifically comprises the following steps:
step S1, a first crack is obtained on a battery plate sample by utilizing a three-point bending method, the first crack is parallel to the wide side of the battery plate sample, and the first bending strength is calculated according to the first crack;
step S2, if the first bending strength is unqualified, two groups of pressing rollers with opposite angles at two ends are kept in contact with the panel sample, the other four groups of pressing rollers are far away from the panel sample, the two groups of pressing rollers which are kept in contact with the panel sample are reversely rotated to enable the panel sample to rotate by a certain angle, a second crack is obtained on the panel sample by using a three-point bending method, the second crack is arranged at a first included angle with the broadside of the panel sample, and the second bending strength is calculated according to the second crack;
s3, if the N-1 bending strength is still not qualified, acquiring an N crack on the battery plate sample by using a three-point bending method, wherein the N crack and the wide side of the battery plate sample are arranged at an N-1 included angle, the N-1 included angle is larger than an N-2 included angle, N is more than or equal to 3, and the N bending strength is calculated according to the N crack;
wherein the first crack, the second crack and the Nth crack are mutually spaced and do not intersect in the length direction of the battery plate sample.
2. The method for detecting the bending strength of the photovoltaic cell panel according to claim 1, wherein a plurality of first, second and nth cracks are formed, and the average value is obtained according to the plurality of the obtained results.
3. The method for detecting the bending strength of the photovoltaic cell panel according to claim 2, wherein a plurality of first cracks are uniformly distributed along the length direction of the panel sample, and each second crack or nth crack is respectively located between two adjacent first cracks.
4. A method for detecting bending strength of a photovoltaic cell panel according to claim 3, wherein when forming a second or nth crack between two adjacent first cracks, the bending direction of the panel sample is opposite to the bending direction when forming the first crack.
5. The method for detecting bending strength of a photovoltaic cell panel according to claim 1, wherein after each test, the panel test specimen is flattened.
6. The method for detecting bending strength of a photovoltaic cell panel according to claim 1, wherein the device for detecting bending strength of a photovoltaic cell panel further comprises a first driving mechanism, a second driving mechanism and a third driving mechanism; the first driving mechanism is used for driving the press roller to rotate around the axis of the press roller, the second driving mechanism is used for driving the press roller to move up and down, and the third driving mechanism is used for driving the press roller to slide along the length direction of the box body.
7. The method for detecting bending strength of a photovoltaic cell panel according to claim 6, wherein the first driving mechanism comprises a first servo motor, and an output shaft of the first servo motor is connected with the press roller to drive the press roller to rotate.
8. The method for detecting the bending strength of the photovoltaic cell panel according to claim 7, wherein the second driving mechanism comprises a first electric cylinder, the first electric cylinder can be arranged on the box body in a sliding manner along the length direction of the box body, and the output end of the first electric cylinder is connected with the first servo motor so as to drive the press roller to move up and down.
9. The method for detecting the bending strength of the photovoltaic cell panel according to claim 8, wherein the third driving mechanism comprises a second servo motor, a rolling gear and a fixed rack, the second servo motor is arranged on the box body in a sliding mode along the length direction of the box body, an output shaft of the second servo motor is in relative rotation connection with the first electric cylinder, the rolling gear is sleeved on the output shaft of the second servo motor and rotates under the driving of the second servo motor, and the fixed rack is arranged on the box body and meshed with the rolling gear.
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