CN113670815A - Tensile test method for solder paste and core plate of MWT component - Google Patents
Tensile test method for solder paste and core plate of MWT component Download PDFInfo
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- CN113670815A CN113670815A CN202111231469.2A CN202111231469A CN113670815A CN 113670815 A CN113670815 A CN 113670815A CN 202111231469 A CN202111231469 A CN 202111231469A CN 113670815 A CN113670815 A CN 113670815A
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- core plate
- solder paste
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/04—Measuring adhesive force between materials, e.g. of sealing tape, of coating
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
Abstract
The invention discloses a tensile force test method of tin paste and a core plate for an MWT assembly, which comprises the steps of printing the tin paste on the core plate through an MWT printing screen plate, sequentially preparing samples from glass, an EVA (ethylene vinyl acetate) adhesive film, a first core plate adhered with the tin paste, an isolating layer, a second core plate not adhered with the tin paste, the EVA adhesive film, high-temperature cloth and the like, putting the prepared samples into a laminator according to a product production process for laminating samples, taking out the prepared samples, respectively placing the first core plate and the second core plate at two ends of a tensile machine, reversely testing the tensile force values of the samples and recording data.
Description
Technical Field
The application relates to the technical field of solder paste tension detection methods, in particular to a tension test method for solder paste and a core plate of an MWT assembly.
Background
The MWT module is a technical route of a photovoltaic module, and the production scale is limited at present due to the high technical difficulty. The common conventional component connects the positive and negative electrodes of the battery piece through the solder strip, the MWT component connects the core board and the positive and negative electrodes of the battery piece through the solder paste, the circuit conduction is ensured, the bonding performance, particularly the tensile performance, of the solder paste and the core board is very important, and the reliability of the MWT component is caused by the insufficient tensile performance. At present, the tensile test of the solder paste and the core plate is still in a blank stage, no proper mature technology and no method are provided for testing the tensile test of the solder paste and the core plate, and serious reliability hidden danger exists.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the tensile force testing method for the solder paste and the core plate of the MWT component, which can quickly detect the tensile force condition between the solder paste and the core plate and improve the reliability of the product.
The invention discloses a tensile test method of solder paste and a core plate for an MWT assembly, which comprises the following steps: step 1, manufacturing a core plate adhered with solder paste; step 2, preparing a sample, sequentially placing glass, an EVA (ethylene vinyl acetate copolymer) adhesive film, a first core board adhered with tin paste, an isolation layer, a second core board not adhered with the tin paste, the EVA adhesive film and high-temperature cloth, wherein one surface of the core board adhered with the tin paste faces the isolation layer, and fixing the prepared sample on the glass by using a high-temperature adhesive tape; step 3, putting the sample into a laminator, performing a series of laminating actions such as vacuumizing, pressurizing, heat preservation and the like according to the production process of the product to manufacture the sample, adhering the sample into a whole by melting an EVA (ethylene vinyl acetate) adhesive film, and adhering the solder paste on the first core plate to the second core plate through the isolation layer; and 4, taking out the laminated sample, cooling at room temperature, respectively placing the first core plate and the second core plate in the sample at two ends of a clamp of a tensile machine after the temperature is reduced to the room temperature, testing the tensile value of the first core plate and the second core plate, and recording the measurement data.
Preferably, the method for manufacturing the core plate adhered with the solder paste comprises the following steps: keeping the temperature of the solder paste constant at room temperature for more than 4 hours, then placing the solder paste on a printing screen, cutting a core plate according to the requirement, and printing the solder paste on the core plate through the printing screen.
Preferably, the printing screen comprises a frame, a stretching net and a steel net, the outer edge of the stretching net is attached to the inner edge of the frame, the steel net is arranged in the center of the stretching net, a plurality of meshes with the same diameter are equidistantly arranged on the steel net, and solder paste is printed on the core plate through the meshes.
Preferably, the core plate is made of copper foil or copper aluminum foil.
Preferably, the isolation layer is made of cellophane, PET or high-temperature cloth, the length of the isolation layer is larger than that of the core plate, and the width of the isolation layer is larger than that of the core plate.
Preferably, the isolating layer is provided with hole sites at equal intervals, the circle center positions of the hole sites are consistent with the circle center positions of the meshes of the printing screen, and the diameters of the hole sites are larger than the diameters of the meshes.
Preferably, the method for testing the tensile value in the step 4 comprises the following steps: and (3) taking off the high-temperature cloth, cutting the second core plate and the EVA adhesive film adhered to the second core plate in the sample, fixing the second core plate and the EVA adhesive film adhered to the second core plate at one end of a tension machine clamp, fixing the first core plate and the glass adhered to the first core plate at the other end of the tension machine clamp, adjusting the tension speed, testing the tension value between the first core plate and the second core plate in a 180-degree reverse direction, and recording the measurement data.
Preferably, the pulling speed is adjusted to be 20-200 mm/s.
Preferably, the high-temperature cloth is made of a Teflon material which is not adhered to the EVA adhesive film and is used for isolating the EVA adhesive film from the laminating machine.
Preferably, the recorded measurement data is judged, and the measurement data is judged to be qualified when the tension value range is larger than or equal to 5N.
Compared with the prior art, the invention has the following advantages: the tensile test method of the solder paste and the core plate for the MWT component has the following beneficial effects:
the invention provides a method for rapidly detecting the tensile force of the solder paste and the core plate by filling the gap of the solder paste and core plate tensile force test method in the prior art, the available material has high selectivity, convenient detection and high reliability, the normal operation of production is not influenced, the detection efficiency of the solder paste and the core plate is improved, the reliability of the product is improved, and the long-term service life of the product is met.
Drawings
In order to more clearly illustrate the technical solutions of the present invention patent, the drawings needed to be used in the present invention patent will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention patent, and other drawings can be obtained by those skilled in the art without inventive efforts.
Fig. 1 is a schematic view of a printing screen according to an embodiment of the present invention;
FIG. 2 is a schematic view of an isolation layer according to an embodiment of the present invention;
FIG. 3 is a schematic illustration of sample preparation according to one embodiment of the present invention;
the high-temperature-resistant composite material comprises 1 part of glass, 2 parts of EVA (ethylene vinyl acetate) adhesive film, 3-1 part of first core board, 3-2 parts of second core board, 4 parts of isolating layer, 5 parts of high-temperature cloth, 6 parts of solder paste, 7 parts of frame, 8 parts of stretching net, 9 parts of steel net.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1 to 3, the invention discloses a tensile test method of solder paste and a core plate for an MWT assembly, which specifically comprises the following steps:
Firstly, a printing screen is prepared, as shown in fig. 1, the printing screen comprises a frame 7, a stretching net 8 and a steel net 9, the outer edge of the stretching net 8 is attached to the inner edge of the frame 7, the steel net 9 is arranged in the center of the stretching net 8, and a plurality of meshes with the same diameter are equidistantly arranged on the steel net 9. The printing screen may be a screen for battery cells, or may be a plate for a predetermined distance. The thickness of steel mesh is between 0.2mm ~0.6mm, can adjust, and the diameter size of mesh is between 1.2mm ~4.0mm, and the interval of mesh is more than or equal to 20mm, and the diameter of the preferred mesh of this embodiment is 3 mm.
And 2, manufacturing samples, as shown in fig. 3, sequentially placing the samples in sequence from bottom to top, sequentially arranging glass 1, an EVA (ethylene vinyl acetate) adhesive film 2, a first core board 3-1 adhered with the solder paste 6, an isolating layer 4, a second core board 3-2 not adhered with the solder paste 6, the EVA adhesive film 2 and high-temperature cloth 5, wherein the surface of the first core board 3-1 adhered with the solder paste 6 faces the isolating layer, and fixing the manufactured samples on the glass by using a high-temperature adhesive tape. The EVA adhesive film 2 preferably has the size of 200mm x 100mm and the number of 2; the isolating layer 4 is preferably cellophane, the size is 150mm x 100mm, and the number is 1; the size of the high-temperature cloth 5 is equal to that of glass, and the material is Teflon material which is not adhered with the EVA adhesive film and is used for isolating the EVA adhesive film from the laminating machine. The isolation layer 4 is made of glass paper, PET or high-temperature cloth and other materials which are not adhered to the EVA adhesive film and do not deform under high temperature and high pressure. The thickness of the isolation layer 4 is between 0.1 mm-0.3 mm, and must be less than the thickness of the printing screen, the length of the isolation layer 4 needs to be greater than the length of the core plate, and the width of the isolation layer 4 needs to be greater than the width of the core plate. Hole sites are arranged on the isolation layer 4 at equal distances and are round holes, square holes or elliptical holes, the circle center positions of the hole sites are consistent with the circle center positions of the meshes of the printing screen, and the diameters of the hole sites are larger than the diameters of the meshes. The diameter of the hole site is between 3.0mm ~10.0mm, and the preferred aperture of diameter 6.0mm of this embodiment is twice the mesh diameter of steel mesh to prevent that the tin cream from pasting on the isolation layer.
And 3, putting the sample into a laminator, performing a series of laminating actions such as vacuumizing, pressurizing, heat preservation and the like according to a product production process to manufacture the sample, melting the EVA adhesive film 2 at a high temperature, adhering the glass 1 and the first core board 3-1 together through the melted EVA adhesive film 2, adhering the EVA adhesive film 2 and the second core board 3-2 together to enable the sample to be an integral body, and adhering the tin paste on the first core board to the second core board through the isolation layer.
And 4, taking out the laminated sample, cooling at room temperature, taking out the high-temperature cloth after the temperature is reduced to the room temperature, cutting the second core board 3-2 and the EVA adhesive film 2 in the sample into strips with the width of 20mm, fixing the strips at one end of a tension machine fixture, fixing the glass 1 and the first core board 3-1 at the other end of the tension machine fixture, adjusting the tension speed to 20-200 mm/s, preferably 100mm/s in the embodiment, reversely testing the tension value at 180 degrees, and recording the measurement data.
And 5, judging whether the measured data is qualified or not, and judging that the tensile force is qualified when the tensile force value is more than or equal to 5N.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. A tensile test method of solder paste and a core plate for an MWT component is characterized by comprising the following steps:
step 1, manufacturing a first core board adhered with solder paste;
step 2, manufacturing a sample, and sequentially placing glass, an EVA (ethylene vinyl acetate copolymer) adhesive film, a first core board adhered with tin paste, an isolation layer, a second core board not adhered with the tin paste, the EVA adhesive film and high-temperature cloth in sequence, wherein one surface of the first core board adhered with the tin paste faces the isolation layer;
step 3, putting the sample into a laminator to perform laminating action according to the production process of the product, adhering the sample into a whole by melting an EVA (ethylene vinyl acetate) adhesive film, and adhering the solder paste on the first core plate to the second core plate through the isolation layer;
and 4, taking out the laminated sample, cooling at room temperature, respectively placing the first core plate and the second core plate in the sample at two ends of a clamp of a tensile machine after the temperature is reduced to the room temperature, testing the tensile value of the first core plate and the second core plate, and recording the measurement data.
2. The method for testing the tensile force of the solder paste and the core plate for the MWT component as claimed in claim 1, wherein the method for manufacturing the first core plate adhered with the solder paste specifically comprises the following steps: and (3) keeping the temperature of the solder paste at room temperature for more than 4 hours, then placing the solder paste on a printing screen, cutting the core plate according to the requirement, and printing the solder paste on the core plate through the printing screen.
3. The method for testing the tensile force of the solder paste and the core plate of the MWT component as claimed in claim 2, wherein the printing screen comprises a frame, a stretching net and a steel net, the outer edge of the stretching net is attached to the inner edge of the frame, the steel net is arranged in the center of the stretching net, a plurality of meshes with the same diameter are equidistantly arranged on the steel net, and the solder paste is printed on the core plate through the meshes.
4. The method for testing the tensile force of the solder paste and the core board for the MWT component as claimed in claim 3, wherein the material of the first core board and the second core board is copper foil or copper aluminum foil.
5. The method for testing the tensile force of the solder paste and the core board for the MWT component as claimed in claim 1 or 4, wherein the material of the isolation layer is cellophane, PET or high temperature cloth, the length of the isolation layer is larger than the length of the core board, and the width of the isolation layer is larger than the width of the core board.
6. The method of claim 5, wherein the spacer layer is provided with holes at equal intervals, the center of the holes is substantially the same as the center of the screen holes of the printing stencil, and the diameter of the holes is larger than the diameter of the screen holes.
7. The method for testing the tensile force of the solder paste and the core plate for the MWT component as set forth in claim 1 or 6, wherein the method for testing the tensile force value in the step 4 is as follows: and (3) taking off the high-temperature cloth, cutting the second core plate and the EVA adhesive film adhered to the second core plate in the sample, fixing the second core plate and the EVA adhesive film adhered to the second core plate at one end of a tension machine clamp, fixing the first core plate and the glass adhered to the first core plate at the other end of the tension machine clamp, adjusting the tension speed, testing the tension value between the first core plate and the second core plate in a 180-degree reverse direction, and recording the measurement data.
8. The method for testing the tensile strength of the solder paste and the core plate for the MWT component as claimed in claim 7, wherein the tensile speed is adjusted to 20-200 mm/s.
9. The method of claim 8, wherein the high temperature cloth is made of Teflon material that is not adhered to the EVA adhesive film, and is used for isolating the EVA adhesive film from the laminator.
10. The method for testing the tensile force of the solder paste and the core plate for the MWT assembly according to claim 8 or 9, wherein the recorded measurement data is judged, and the measurement data is judged to be qualified when the range of the tensile force value is greater than 5N.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111231469.2A CN113670815B (en) | 2021-10-22 | 2021-10-22 | Tensile test method for solder paste and core plate of MWT component |
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| CN202111231469.2A CN113670815B (en) | 2021-10-22 | 2021-10-22 | Tensile test method for solder paste and core plate of MWT component |
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Cited By (2)
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| CN114235682A (en) * | 2021-12-27 | 2022-03-25 | 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 |
| CN114295543A (en) * | 2021-12-07 | 2022-04-08 | 江苏日托光伏科技股份有限公司 | Adhesion force detection method for adhesive material in MWT assembly |
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| CN113670815B (en) | 2022-02-18 |
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Effective date of registration: 20221123 Address after: 20 Xishi Road, Xinwu District, Wuxi City, Jiangsu Province Patentee after: JIANGSU SUNPORT PHOTOVOLTAIC TECHNOLOGY Co.,Ltd. Address before: 211800 no.28-10, Lanhua Road, Qiaolin Street Industrial Park, Pukou District, Nanjing City, Jiangsu Province Patentee before: NANJING RITUO PHOTOVOLTAIC NEW ENERGY Co.,Ltd. |