CN115985792A - Weldability detection method for photovoltaic cell - Google Patents
Weldability detection method for photovoltaic cell Download PDFInfo
- Publication number
- CN115985792A CN115985792A CN202111205296.7A CN202111205296A CN115985792A CN 115985792 A CN115985792 A CN 115985792A CN 202111205296 A CN202111205296 A CN 202111205296A CN 115985792 A CN115985792 A CN 115985792A
- Authority
- CN
- China
- Prior art keywords
- photovoltaic cell
- measuring
- solder
- welding
- wetting angle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
Landscapes
- Photovoltaic Devices (AREA)
Abstract
The invention discloses a weldability detection method of a photovoltaic cell, relates to the technical field of photovoltaics, and aims to solve the problems of low efficiency, high cost and large error when manual detection is adopted. The solderability detection method comprises the steps of providing a photovoltaic cell and solder, and presetting a solder joint position on the photovoltaic cell; selecting a solder with the volume matched with the area of the welding spot position according to the area of the welding spot position preset on the photovoltaic cell; placing the selected solder at a preset welding point position on the photovoltaic cell for welding to obtain a detection sample; and measuring the wetting angle of a welding spot formed by welding the solder in the detection sample, and judging the weldability of the photovoltaic cell according to the size of the wetting angle. The solderability detection method of the photovoltaic cell is used for detecting the solderability of the photovoltaic cell.
Description
Technical Field
The invention relates to the technical field of photovoltaics, in particular to a method for detecting the weldability of a photovoltaic cell.
Background
Generally, a photovoltaic cell used in a photovoltaic module is a cell string formed by connecting a plurality of photovoltaic cells in series by a welding technology, and two photovoltaic cells are connected in series by being respectively welded with a welding strip, so that the electrical connection among the plurality of cells is ensured. The safety performance and the finished product quality of the photovoltaic cell are directly influenced by the welding effect between the photovoltaic cell and the welding strip, and when the welding effect between the photovoltaic cell and the welding strip is poor, the photovoltaic cell is poor in quality and risks such as spontaneous combustion exist.
Therefore, in the production and manufacturing process of the photovoltaic cell, the welding effect between the photovoltaic cell and the solder strip and other materials in the photovoltaic cell needs to be detected. Generally, the matching property between the photovoltaic cell and a welding material or a welding process is called the weldability of the photovoltaic cell, and the existing method for judging the weldability of the photovoltaic cell is manual judgment, namely, a worker judges the weldability of the photovoltaic cell according to the results of multiple processing tests or by experience.
Disclosure of Invention
The invention aims to provide a method for detecting the weldability of a photovoltaic cell, which is used for detecting the weldability of the photovoltaic cell and improving the detection efficiency and precision.
In order to achieve the above purpose, the invention provides the following technical scheme:
a solderability detection method of a photovoltaic cell comprises the steps of providing the photovoltaic cell and a solder, and presetting a solder joint position on the photovoltaic cell; selecting a solder with the volume matched with the area of the welding spot position according to the area of the welding spot position preset on the photovoltaic cell; placing the selected solder at a preset welding point position on the photovoltaic cell for welding to obtain a detection sample; and measuring the wetting angle of a welding spot formed by welding the solder in the detection sample, and judging the weldability of the photovoltaic cell according to the size of the wetting angle.
Compared with the prior art, the solderability of the photovoltaic cell is judged by measuring the wetting angle of a welding spot formed by welding a welding flux in a detection sample, so that the solderability of the photovoltaic cell can be detected by adopting the method, the welding effect between the photovoltaic cell and materials such as a welding strip is further obtained, and whether the safety performance and the finished product quality of the photovoltaic cell meet the requirements or not is judged, so that the photovoltaic cell which is put into use is ensured to have good safety performance and finished product quality, and the safety and the service life of a photovoltaic module are improved; secondly, when the detection method is used for detecting the weldability of the photovoltaic cell, the detection efficiency is high, the detection precision is high, the test times are few, and the detection cost is low.
Optionally, in the method for detecting solderability of a photovoltaic cell, as the wetting angle is smaller, the solderability of the photovoltaic cell is better. So set up, the solderability between the photovoltaic cell of a plurality of different wetting angles of being convenient for accurate comparison improves the precision that solderability judged.
Optionally, in the method for detecting solderability of a photovoltaic cell, the solderability of the photovoltaic cell is judged according to the size of the wetting angle, and specifically, when the wetting angle is smaller than 50 degrees, the welding defect rate is low, and the solderability of the photovoltaic cell is good; when the wetting angle is 50-90 degrees, the welding reject ratio is improved, and the weldability of the photovoltaic cell is general; when the wetting angle is greater than 90 ° and less than 180 °, there is a risk of soldering failure, and the solderability of the photovoltaic cell is poor; when the wetting angle is 180 °, the solder cannot be soldered on the photovoltaic cell, and the photovoltaic cell has no solderability. So set up, be convenient for according to the size of wetting angle, judge photovoltaic cell's weldability.
Optionally, in the weldability detection method for a photovoltaic cell, in the wetting angle range of 50 ° to 90 °, the welding defect rate when the wetting angle range is 50 ° to 70 ° is lower than the welding defect rate when the wetting angle range is 70 ° to 90 °, and the weldability of the photovoltaic cell when the wetting angle range is 50 ° to 70 ° is better than the weldability of the photovoltaic cell when the wetting angle range is 70 ° to 90 °. Due to the arrangement, the solderability of the photovoltaic cell with the wetting angle within the range of 50-90 degrees can be further judged.
Optionally, in the method for detecting solderability of a photovoltaic cell, an angle measuring instrument is used to measure the wetting angle of a solder joint formed by soldering solder in a detection sample. The arrangement is convenient for measuring the wetting angle of the welding spot formed by welding the solder in the detection sample.
Optionally, in the method for detecting solderability of a photovoltaic cell, when an angle measuring instrument is used to measure a wetting angle of a solder joint formed by soldering solder in a detection sample, a plane perpendicular to the surface of the photovoltaic cell is selected as a measurement plane, and projections of the solder joint and the photovoltaic cell on the measurement plane are made; making a measuring straight line on the measuring plane, selecting a projection boundary of the welding point on the measuring plane, and taking an intersection point between the projection boundary and the projection line of the surface of the photovoltaic cell on the measuring plane as a measuring point; adjusting the position of the measuring straight line so that the measuring straight line passes through the measuring point and is tangent to the projection boundary of the welding point on the measuring plane; and measuring the included angle value between the measuring straight line and the projection line of the surface of the photovoltaic cell on the measuring plane, and taking the included angle value as the wetting angle of a welding point formed by welding the solder in the detection sample. By the arrangement, the wetting angle of the welding point formed by welding the solder in the detection sample is conveniently measured by the angle measuring instrument.
Optionally, in the method for detecting weldability of a photovoltaic cell, the measuring points include a first measuring point and a second measuring point that are respectively located on two sides of the welding point, and when an angle measuring instrument is used to measure a wetting angle of the welding point formed by welding the solder in the detection sample, the method includes adjusting a position of a measuring straight line so that the measuring straight line passes through the first measuring point and is tangent to a projection boundary of the welding point on the measuring plane; measuring the included angle value between the measuring straight line and the projection line of the surface of the photovoltaic cell on the measuring plane, and taking the included angle value as a first wetting angle; adjusting the position of the measuring straight line so that the measuring straight line passes through the second measuring point and is tangent to the projection boundary of the welding point on the measuring plane; measuring an included angle value between the measuring straight line and a projection line of the surface of the photovoltaic cell on the measuring plane, and taking the included angle value as a second wetting angle; and calculating an average value between the first wetting angle and the second wetting angle, and taking the average value between the first wetting angle and the second wetting angle as the wetting angle of a welding point formed by welding the solder in the detection sample. So set up, be convenient for obtain the angle value of accurate wetting angle.
Optionally, in the method for detecting the weldability of the photovoltaic cell, the solder with the volume matched with the area of the welding point position is selected according to the area of the welding point position preset on the photovoltaic cell, specifically, the area S of the welding point position preset on the photovoltaic cell is measured; when the area S is more than or equal to 4mm 2 When the solder is selected, the volume V =1mm × 1mm × H is selected, and the area S is<4mm 2 When the volume is V =1/3 XS multiplied by H, H is setThe solder height of (a). By the arrangement, proper solder can be conveniently selected for welding, and normal operation of a welding process is guaranteed.
Optionally, in the method for detecting solderability of a photovoltaic cell, in the step of selecting a solder with a volume matching the area of the solder joint position according to the area of the solder joint position preset on the photovoltaic cell, the solder is a solder processed into a strip shape or a block shape. So set up, facilitate the selection and processing of solder in the subsequent step.
Optionally, in the method for detecting solderability of a photovoltaic cell, before the step of placing the selected solder at the preset solder joint position on the photovoltaic cell for soldering, flux is coated on the surface of the selected solder. By the arrangement, the welding performance is improved, and the smooth operation of the welding process is ensured.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic diagram of a method of detecting solderability of a photovoltaic cell in an embodiment of the invention;
FIG. 2 is a schematic diagram of a method for determining solderability of a photovoltaic cell based on a wetting angle in an embodiment of the present invention;
FIG. 3 is a schematic diagram of a method for measuring a wetting angle of a solder joint formed by soldering solder in a test sample by using an angle measuring instrument according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of the projection of the solder joint and the photovoltaic cell on the measurement plane and the measurement line when the wetting angle is 50 degrees in the embodiment of the present invention;
FIG. 5 is a schematic diagram of the projection of the solder joint and the photovoltaic cell on the measurement plane and the measurement line when the wetting angle is 70 degrees in the embodiment of the present invention;
FIG. 6 is a schematic diagram of the projection of the solder joint and the photovoltaic cell on the measurement plane and the measurement line when the wetting angle is 90 degrees in the embodiment of the present invention;
FIG. 7 is a schematic diagram of the projection of the solder joint and the photovoltaic cell on the measurement plane and the measurement line at a wetting angle of 126 degrees in an embodiment of the present invention;
FIG. 8 is a schematic diagram of the projection of the solder joint and the photovoltaic cell on the measurement plane and the measurement line when the wetting angle is 180 degrees in the embodiment of the present invention.
Reference numerals:
1-projection of the solder joint on the measuring plane, 2-measuring straight line, 3-projection line of the surface of the photovoltaic cell on the measuring plane, 4-projection boundary.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. The meaning of "a number" is one or more unless specifically limited otherwise.
In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, which are merely for convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and operate, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the production and manufacturing process of the photovoltaic cell, a plurality of cells need to be welded together to form a cell string, the welding process of the photovoltaic cell is essentially a process of forming a binary alloy (silver-tin alloy) by silver on a main grid line of a cell piece and soldering tin on a solder strip, and the condition of forming the binary alloy is that at least one substance is in a liquid state. When one of the substances is in a solid state and the other substance is in a liquid state, the reaction position of the battery and the welding strip is only the solid-liquid contact part, namely, when the solid-liquid two-phase binary alloy reacts, the larger the solid-liquid contact area is, the more violent the reaction is.
During welding, liquid is in contact with solid and is placed on the surface of the solid, the liquid can automatically spread on the surface of the solid, the phenomenon that the liquid flows on the surface of the solid is called wetting, an included angle between a liquid-solid interface and a liquid surface tangent line at a contact point of a liquid phase and a solid phase is called a wetting angle, wetting is indicated when the wetting angle is smaller than 90 degrees, non-wetting is indicated when the wetting angle is larger than 90 degrees, the smaller the wetting angle is, the better the solid-liquid contact is, namely the better the welding effect is, namely the size of the wetting angle can represent the quality of the welding effect.
In addition, the liquid itself has surface tension, and surface tension (surface self-contraction force) refers to a phenomenon that an interface always tends to be the smallest due to different acting forces of molecules in a phase boundary and molecules in a bulk phase in different coexisting systems. During welding, the force of the liquid automatically spreading on the solid is called wetting force, the relationship between the wetting force and the surface tension of the liquid determines the wetting effect of the liquid, when the wetting force is greater than the surface tension of the liquid, the liquid can be wetted, and when the wetting force is less than the surface tension of the liquid, the liquid cannot wet the solid, namely cannot be welded.
Referring to fig. 1, a method for detecting solderability of a photovoltaic cell according to an embodiment of the present invention includes providing a photovoltaic cell and a solder, and presetting a solder joint position on the photovoltaic cell; selecting a solder with the volume matched with the area of the welding spot position according to the area of the welding spot position preset on the photovoltaic cell; placing the selected solder at a preset welding point position on the photovoltaic cell for welding to obtain a detection sample; and measuring the wetting angle of a welding spot formed by welding the solder in the detection sample, and judging the weldability of the photovoltaic cell according to the size of the wetting angle. The welding material is used for welding materials, in the embodiment, the welding material is preferably soldering tin, and the preset welding point position on the photovoltaic cell is a position preset on the surface of the photovoltaic cell and welded with the welding material before welding; and the detection sample is the welded photovoltaic cell.
When the solder is soldering tin, be liquid after the soldering tin melts, can condense shrinkage and with the silver thick liquid contact on photovoltaic cell surface under the effect of its self surface tension, produce moist effect, because the wetting power of soldering tin and silver is far greater than the surface tension (even being greater than gravity) of liquid soldering tin for solder joint near can be to the solder joint gathering under the effect of wetting power, form the shape of approximate wetting angle.
According to the method for detecting the weldability of the photovoltaic cell, during detection, the welding point position is preset on the photovoltaic cell, subsequent welding materials can be conveniently welded on the surface of the cell, the size of the welding materials is selected according to the area of the welding point position, the welding effect between the photovoltaic cell and the cell is prevented from being influenced when too much or too little welding materials exist, the weldability of the photovoltaic cell is judged by detecting the wetting angle of the welding point in a welded detection sample, the weldability of the photovoltaic cell can be detected by adopting the method, the welding effect between the photovoltaic cell and materials such as a welding strip and the like is further obtained, and whether the safety performance and the finished product quality of the photovoltaic cell meet requirements or not is judged, so that the photovoltaic cell which is put into use is ensured to have good safety performance and finished product quality, and the safety and the service life of a photovoltaic module are improved; meanwhile, the detection method has the advantages of high detection efficiency, high detection precision, less test times and low detection cost; compared with a method for detecting the weldability of the battery by detecting the spreading degree of the liquid, the method in the embodiment has the advantages that the error is smaller, the measurement precision is higher, and the obtained weldability judgment is more accurate; the detection method can be used for process test detection before normal production and can also be used for finished product sampling detection in production or after production is finished.
As a possible implementation manner, in this embodiment, as the wetting angle is smaller and smaller, the solderability of the photovoltaic cell is better and better, and when the test is performed for many times, the solderability between the detected photovoltaic cells under a plurality of different wetting angles can be accurately compared, so as to accurately judge the soldering effect of the photovoltaic cell.
As shown in fig. 2, in some embodiments, the solderability of the photovoltaic cell is determined according to the wetting angle, specifically, when the wetting angle is less than 50 °, the soldering defect rate is low, and the solderability of the photovoltaic cell is good; when the wetting angle is 50-90 degrees, the welding reject ratio is improved, and the weldability of the photovoltaic cell is general; when the wetting angle is greater than 90 degrees and less than 180 degrees, the risk of welding failure exists, and the weldability of the photovoltaic cell is poor; when the wetting angle is 180 °, the solder cannot be soldered on the photovoltaic cell, and the photovoltaic cell has no solderability. By adopting the judging method, the wetting angle is divided into four areas to respectively correspond to four grades of good weldability, general weldability, poor weldability and no weldability, so that the welding effect of the photovoltaic cell is accurately judged, and workers or a control system can judge the weldability of the photovoltaic cell according to the size of the wetting angle.
In order to further judge the weldability of the photovoltaic cell when the wetting angle is within 50-90 degrees, in the implementation, the wettability is preferably 50-90 degrees, the welding fraction defective when the wetting angle is 50-70 degrees is lower than that when the wetting angle is 70-90 degrees, and the weldability of the photovoltaic cell when the wetting angle is 50-70 degrees is better than that when the wetting angle is 70-90 degrees, namely, the weldability of the photovoltaic cell is further judged when the wetting angle is within 50-90 degrees by comparing the magnitude relation between the wetting angle and the 70 degree, so that the detection accuracy is improved. When the wetting angle is less than 50 degrees, the welding effect is good, abnormal welding can not occur in the manufacturing process, and when the wetting angle is 50 degrees to 70 degrees, the proportion of poor welding is obviously increased; when the wetting angle is 70-90 degrees, poor batch welding can occur; when the wetting angle is larger than 90 degrees, the risk of no welding exists, and when the wetting angle reaches 180 degrees, the soldering tin can not be welded with the silver paste completely.
As a possible implementation manner, in this embodiment, the wetting angle of the solder joint formed by the solder in the detection sample after being soldered is measured by using the angle measuring instrument, and when the wetting angle of the solder joint formed by the solder in the detection sample after being soldered is measured by using the angle measuring instrument, the wetting angle can be conveniently and accurately measured.
As shown in fig. 3 to 8, when an angle measuring instrument is used to measure the wetting angle of a solder joint formed by soldering solder in a sample to be tested, the measuring method comprises selecting a plane perpendicular to the surface of the photovoltaic cell as a measuring plane, and making projections of the solder joint and the photovoltaic cell on the measuring plane; a measuring straight line 2 is made on a measuring plane, and the intersection point of a projection boundary 4 of a welding spot on the measuring plane and a projection line 3 of the surface of the photovoltaic cell on the measuring plane is selected as a measuring point; adjusting the position of the measuring straight line so that the measuring straight line passes through the measuring point and is tangent to the projection boundary 4 of the welding point on the measuring plane; the value of the included angle between the measuring straight line and the projection line 3 of the surface of the photovoltaic cell on the measuring plane is measured and is used as the wetting angle of the welding point formed by welding the solder in the detection sample.
When the method is adopted for measurement, the projection 1 of the welding spot on the measurement plane is a plane with an arc boundary, the projection of the photovoltaic cell on the measurement plane is a line, the two ends of the arc boundary of the projection plane of the welding spot are connected with the projection line of the photovoltaic cell, so that a detection graph is formed, the included angle between the measurement straight line and the projection line of the photovoltaic cell is measured by controlling the position of the measurement straight line on the detection plane, so that the size of the wetting angle is measured, and the measurement point is the intersection point of the arc boundary of the projection plane of the welding spot and the projection line.
In an optional mode, the measuring points comprise a first measuring point and a second measuring point which are respectively positioned at two sides of the welding point, and when the wetting angle of the welding point formed by welding the solder in the detection sample is measured by adopting the angle measuring instrument, the position of a measuring straight line is adjusted, so that the measuring straight line passes through the first measuring point and is tangent to the projection boundary 4 of the welding point on the measuring plane; measuring the included angle value between the measuring straight line and the projection line 3 of the surface of the photovoltaic cell on the measuring plane, and taking the included angle value as a first wetting angle; adjusting the position of the measuring straight line so that the measuring straight line passes through the second measuring point and is tangent to the projection boundary 4 of the welding point on the measuring plane; measuring the included angle value between the measuring straight line and the projection line 3 of the surface of the photovoltaic cell on the measuring plane, and taking the included angle value as a second wetting angle; and calculating an average value between the first wetting angle and the second wetting angle, and taking the average value between the first wetting angle and the second wetting angle as the wetting angle of a welding point formed by welding the solder in the detection sample. By the method for detecting the wetting angles of the two points and then averaging, a more accurate wetting angle value can be obtained, and the detection error is reduced.
It can be understood that, in the above method, when the angle values at the first measurement point and the second measurement point are measured by using the measurement straight line, one measurement straight line may be used, the angle values at the first measurement point and the second measurement point may be sequentially measured by changing the position of the measurement straight line, or two measurement straight lines may be used to measure the angle values at the first measurement point and the second measurement point, respectively.
As shown in fig. 4 to 8, a projection 1 of the welding spot on the measuring plane has a projection boundary 4, a measuring straight line passes through an intersection point between the projection boundary 4 of the welding spot on the measuring plane and a projection line 3 of the surface of the photovoltaic cell on the measuring plane and is tangent to the projection boundary 4 on the measuring plane, an included angle θ between the projection line 3 of the surface of the photovoltaic cell on the measuring plane and the measuring straight line is a wetting angle, and it can be seen from fig. 4 to 8 that the shape and the welding degree of the welding spot are respectively when the wetting angle is 50 °, 70 °, 90 °, 126 ° and 180 °.
As aIn this embodiment, a solder with a volume matching the area of the solder joint position is selected according to the area of the solder joint position preset on the photovoltaic cell, specifically, the area S of the solder joint position preset on the photovoltaic cell is measured; when the area S is more than or equal to 4mm 2 When the solder is selected, the volume V =1mm × 1mm × H is selected, and the area S is<4mm 2 When the volume is V =1/3 × S × H, H is a set solder height. In this embodiment, H is a set solder height, preferably, H is 0.03mm, and solders with different volume sizes are selected according to differences in positions and areas of solder points, so that soldering is performed by selecting a proper solder, and normal operation of a soldering process is ensured.
In some embodiments, in the step of selecting the solder with the volume matched with the area of the welding point position according to the area of the preset welding point position on the photovoltaic cell, the solder is a piece of solder which is processed into a strip shape or a block shape, and the solder can be used for facilitating the selection and processing of the solder in the subsequent step, and the solder in the embodiment is preferably a solder wire made of solder and having a diameter of 0.3 mm.
In order to improve the welding performance and ensure the smooth operation of the welding process, in the embodiment, before the step of placing the selected solder on the preset welding point position on the photovoltaic cell for welding, a soldering flux is preferably coated on the surface of the selected solder, wherein the soldering flux is a mixture with rosin as a main component and is an auxiliary material for ensuring the smooth operation of the welding process.
When in specific implementation, the soldering tin of the solder strip is firstly made into a solder wire with the diameter of 0.3mm, then the solder wire is soaked in the soldering flux and is cut into small blocks with the diameter of 0.3 mm-0.5 mm; placing small soldering tin at the center of a welding spot position preset on the surface of the battery; placing the battery with the small soldering tin blocks on a transmission belt of a welding machine in a mode that the front side of the battery is upward, and completing a welding process through the welding machine to obtain a detection sample; placing a detection sample on an angle measuring instrument, measuring a wetting angle of a welding spot formed by reaction between molten soldering tin and silver paste on the surface of the photovoltaic cell, and judging whether the weldability of the photovoltaic cell meets the requirements under the conditions of adopting the materials such as the soldering flux, the photovoltaic cell and the like and adopting the soldering process and the detection method according to the angle of the wetting angle; when the material or the welding process is changed, the weldability of the photovoltaic cell under the condition of different materials or welding processes can be detected by adopting the weldability detection method of the photovoltaic cell, and the influence of different materials or welding processes on the weldability of the photovoltaic cell can be judged according to the detected different weldability results.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and shall cover the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A method for detecting solderability of a photovoltaic cell, comprising:
providing a photovoltaic cell and a solder, and presetting a welding spot position on the photovoltaic cell;
selecting a welding flux with the volume matched with the area of the welding spot position according to the area of the welding spot position preset on the photovoltaic cell;
placing the selected solder at a preset welding point position on the photovoltaic cell for welding to obtain a detection sample;
and measuring the wetting angle of a welding spot formed by welding the solder in the detection sample, and judging the weldability of the photovoltaic cell according to the size of the wetting angle.
2. The method of claim 1, wherein the solderability of the photovoltaic cell is better as the wetting angle is smaller.
3. The solderability detection method of a photovoltaic cell according to claim 2, wherein the determining the solderability of the photovoltaic cell according to the size of the wetting angle specifically comprises:
when the wetting angle is less than 50 degrees, the welding reject ratio is low, and the weldability of the photovoltaic cell is good;
when the wetting angle is 50-90 degrees, the welding reject ratio is improved, and the weldability of the photovoltaic cell is general;
when the wetting angle is greater than 90 ° and less than 180 °, there is a risk of soldering failure, and the solderability of the photovoltaic cell is poor;
when the wetting angle is 180 °, the solder cannot be soldered on the photovoltaic cell, and the photovoltaic cell has no solderability.
4. The method for detecting the solderability of a photovoltaic cell according to claim 2, wherein the wetting angle is 50 ° to 90 °, the solder defect rate when the wetting angle is 50 ° to 70 ° is lower than the solder defect rate when the wetting angle is 70 ° to 90 °, and the solderability of the photovoltaic cell when the wetting angle is 50 ° to 70 ° is better than the solderability of the photovoltaic cell when the wetting angle is 70 ° to 90 °.
5. The solderability test method of a photovoltaic cell according to claim 1, wherein an angle meter is used to measure the wetting angle of a solder joint formed by soldering solder in the test sample.
6. The method for detecting the solderability of the photovoltaic cell according to claim 5, wherein the step of measuring the wetting angle of the solder joint formed by the solder in the test sample through soldering by using an angle measuring instrument comprises the following steps:
selecting a plane perpendicular to the surface of the photovoltaic cell as a measuring plane, and making projections of the welding spots and the photovoltaic cell on the measuring plane;
making a measuring straight line on the measuring plane, selecting an intersection point between a projection boundary of the welding point on the measuring plane and a projection line of the surface of the photovoltaic cell on the measuring plane as a measuring point;
adjusting the position of the measuring straight line so that the measuring straight line passes through the measuring point and is tangent to the projection boundary of the welding point on the measuring plane;
and measuring the value of an included angle between the measuring straight line and the projection line of the surface of the photovoltaic cell on the measuring plane, and taking the value as the wetting angle of a welding spot formed by welding the solder in the detection sample.
7. The method for detecting the solderability of the photovoltaic cell according to claim 6, wherein the measuring points comprise a first measuring point and a second measuring point respectively located at two sides of the soldering point, and when an angle measuring instrument is used for measuring the wetting angle of the soldering point formed by soldering the solder in the test sample, the method comprises the following steps:
adjusting the position of the measuring straight line so that the measuring straight line passes through the first measuring point and is tangent to the projection boundary of the welding point on the measuring plane;
measuring an included angle value between the measuring straight line and a projection line of the surface of the photovoltaic cell on the measuring plane, and taking the included angle value as a first wetting angle;
adjusting the position of the measuring straight line so that the measuring straight line passes through the second measuring point and is tangent to the projection boundary of the welding point on the measuring plane;
measuring an included angle value between the measuring straight line and a projection line of the surface of the photovoltaic cell on the measuring plane, and taking the included angle value as a second wetting angle;
and calculating an average value between the first wetting angle and the second wetting angle, and taking the average value between the first wetting angle and the second wetting angle as the wetting angle of a welding spot formed by welding the solder in the detection sample.
8. The solderability test method of a photovoltaic cell according to claim 1, wherein the solder with a volume matching the area of the solder joint position is selected according to the area of the solder joint position preset on the photovoltaic cell, and specifically:
measuring the area S of a preset welding spot position on the photovoltaic cell;
when the area S is more than or equal to 4mm 2 When the area S is larger than the area V =1mm × 1mm × H, the solder is selected<4mm 2 When the volume is V =1/3 × S × H, H is a set solder height.
9. The method for detecting the solderability of the photovoltaic cell according to claim 1 or 8, wherein in the step of selecting the solder with the volume matched with the area of the solder joint position according to the area of the solder joint position preset on the photovoltaic cell, the solder is a piece of solder processed into a strip shape or a block shape.
10. The method for detecting solderability of a photovoltaic cell as defined in claim 1, wherein prior to the step of placing the selected solder material on the photovoltaic cell at the predetermined solder joint location for soldering, a flux is applied to the surface of the selected solder material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111205296.7A CN115985792A (en) | 2021-10-15 | 2021-10-15 | Weldability detection method for photovoltaic cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111205296.7A CN115985792A (en) | 2021-10-15 | 2021-10-15 | Weldability detection method for photovoltaic cell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115985792A true CN115985792A (en) | 2023-04-18 |
Family
ID=85974618
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111205296.7A Pending CN115985792A (en) | 2021-10-15 | 2021-10-15 | Weldability detection method for photovoltaic cell |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115985792A (en) |
-
2021
- 2021-10-15 CN CN202111205296.7A patent/CN115985792A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111693573A (en) | Battery tab welding quality evaluation method and device | |
| KR102389447B1 (en) | Resistance welding device and method of cylindrical battery, and cylindrical battery manufactured by the method | |
| CN108181356A (en) | A kind of measuring method of welding battery quality | |
| US7078644B2 (en) | Resistance welding method, resistance welding apparatus, and method for manufacturing electronic component | |
| KR20170110331A (en) | Method of Inspecting Welding State Using Pressure Gauge | |
| CN215005521U (en) | Chip testing seat | |
| JP2002254195A (en) | Soldering composition and soldering method | |
| CN115985792A (en) | Weldability detection method for photovoltaic cell | |
| CN109688727A (en) | One kind having lead pb-free solder method | |
| CN107817274A (en) | The decision method of solar cell processing procedure defect | |
| CN109449614B (en) | Welding grounding clamp | |
| CN111044918B (en) | Method for producing a resistor arrangement for a battery sensor and resistor arrangement | |
| CN210640853U (en) | Test probe and resistivity testing arrangement of test battery piece resistivity | |
| KR20210057965A (en) | An apparatus and method for detecting electrode damage in pouch type secondary battery | |
| US20220190449A1 (en) | Metal plate for resistance welding and resistance welding method using the same | |
| KR20210050394A (en) | Inspection device and inspection method for secondary battery | |
| CN220921318U (en) | Welding quality inspection device | |
| CN219402735U (en) | Mobile phone soldering tin clamp with detection function | |
| CN213544748U (en) | A accurate positioner for among PCB board detecting system | |
| CN217797496U (en) | Novel fuse on-line welding inspection equipment | |
| CN116519745A (en) | Method for detecting corrosiveness of soldering flux to battery piece | |
| CN210182528U (en) | Bluetooth battery aging clamp | |
| CN217238169U (en) | Probe assembly capable of monitoring needle pressure gram weight | |
| CN214582935U (en) | Device for measuring welding seal height of tab welding on line | |
| CN114664955A (en) | Method for testing coating uniformity of solder strip |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |