CN118039521A - Device and method for testing insulation property of thin grid of battery piece and preparation method of back contact assembly - Google Patents
Device and method for testing insulation property of thin grid of battery piece and preparation method of back contact assembly Download PDFInfo
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- CN118039521A CN118039521A CN202410431803.6A CN202410431803A CN118039521A CN 118039521 A CN118039521 A CN 118039521A CN 202410431803 A CN202410431803 A CN 202410431803A CN 118039521 A CN118039521 A CN 118039521A
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Abstract
The application discloses a device and a method for testing the insulation property of a battery piece fine grid and a method for preparing a back contact assembly, and belongs to the technical field of insulation property testing. The application designs a test board suitable for testing the fine grid insulation performance of a back contact battery piece, and the test board is electrified and an EL image of a single battery piece is shot by pressing the test board down on the back contact battery piece printed with insulating glue, so that the fine grid insulation performance of the battery piece to be tested is rapidly detected; in the preparation process of the back contact assembly, an independent fine grid insulation test is added after the battery piece is printed with the insulating adhesive and before the series welding step, the insulation performance of the fine grid of the battery piece to be tested is rapidly detected through the combination of an insulation test board and an EL test, and the position of a grid line with insufficient insulation performance can be positioned so as to facilitate subsequent repair, and the production efficiency and the production yield in the assembly manufacturing process are ensured.
Description
Technical Field
The application relates to the technical field of insulation performance testing, in particular to a device and a method for testing the insulation performance of a fine grid of a battery piece and a method for preparing a back contact assembly.
Background
In solar energy application, photovoltaic power generation is an important application mode, and is gradually and widely applied due to the advantages of no noise, no maintenance, no emission and the like. Currently, crystalline silicon solar cells dominate the photovoltaic power generation field, thanks to the abundant reserves of silicon materials in the crust, the relatively mature photovoltaic power generation technology and the lower cost. Crystalline silicon solar cells have higher conversion efficiency than other types of commercial cells. And the back contact cell and the back contact component with high conversion efficiency at the present stage are the main trend of the development of crystalline silicon photovoltaic components.
The back contact battery is structurally characterized in that the front surface of the back contact battery is free of grid lines, the back surface of the back contact battery is printed with positive grid lines and negative grid lines at the same time, and the positive grid lines and the negative grid lines are arranged in an interdigital mode. Because the battery piece can short circuit when the positive electrode grid line and the negative electrode grid line are contacted through the conductor, the interdigital arrangement can lead the back contact battery to be arranged on the same side of the battery piece when in test, and the test probes on the adjacent main grids cannot be electrically connected with each other, so that the structural design of the back contact battery piece test board is difficult.
On the other hand, in the manufacturing process of the back contact assembly, the welding strips are required to be welded on the positive electrode main grid line and the negative electrode main grid line of the battery piece respectively and connected with other battery pieces to form a battery string. Because the positive grid line and the negative grid line are interdigital, the welding strip is easy to be simultaneously connected to the adjacent thin grid lines with opposite electrical property when being welded on the main grid, thereby causing local short circuit and affecting the power output of the component.
To solve the problem of local short circuit, a skilled person proposes to print an insulating paste near the main grid before series welding, thereby isolating the adjacent fine grid from the solder strip. However, the actual production process is limited by the yield, and the insulating glue is sometimes incompletely printed, so that a short circuit is possibly caused between the fine grid and the welding strip.
The method adopted in the current production is that the battery piece series printed with the insulating glue is directly welded into a battery string, then EL test is carried out on the battery string, the electroluminescent radiation of minority carriers is utilized to carry out compound luminescence, fluorescence emitted by the photovoltaic module when the voltage is externally applied is collected, the EL image of the battery string is shot, and meanwhile, the welding effect of the battery piece and the printing effect of the insulating glue are detected, so that whether the printing of the insulating glue is reversely pushed is problematic or not. The judging method improves the efficiency of performance test on the battery strings, but has difficulty in positioning and improving the technical problem points, and the production efficiency and the production yield of the battery strings are not high.
Through retrieval, the patent application number 202310669067.3, the application publication date is 2023, 8 and 25, and the patent name is: according to the method for detecting the performance of the IBC solar cell, a high-transmittance glass plate is arranged on the IBC cell to be detected in a covering mode, and the grid line printing side of the IBC cell to be detected is arranged downwards; a flexible copper foil which is arranged in a crossing way is paved on the bottom plate and is used for being abutted with the main grid of the IBC battery to be detected; welding a current collecting belt at two ends of the flexible copper foil and leading out positive and negative electrodes; and fixedly connecting the high-light-transmittance glass plate with the bottom plate to enable the positive electrode and the negative electrode to be connected with an external battery detector so as to finish battery electric performance detection. The application realizes that the IBC battery adopts the whole flexible crimping mode to simulate the connection condition in the assembly to test the battery efficiency, can detect the overall performance of the single-chip battery, can also find the problem of poor printing of the insulating adhesive in advance in detection, and eliminates the risk of subsequent repair. However, the application aims to test the electrical performance parameters of the IBC battery, and only can reversely push from the tested electrical performance parameters of the battery to indirectly judge whether the battery piece has poor printing. Thus, the method for judging the poor printing of the battery piece has two defects. Firstly, the electrical performance parameters of the battery piece are determined by a plurality of factors, whether defects are caused by poor printing or not cannot be judged from the electrical performance parameters, and the short circuit of the battery piece is possibly caused by electrode burning, pollution and other reasons, and the electrical performance parameters under the conditions are consistent with those under the condition of poor printing; secondly, even if the reason for the abnormal electrical performance is determined to be poor printing of the battery piece, the short circuit occurrence position of the battery piece cannot be determined, so that the poor printing position cannot be accurately positioned, and the repair of the battery piece is not facilitated.
Disclosure of Invention
1. Technical problem to be solved
Aiming at the problems in the prior art, the application provides a device and a method for testing the fine grid insulation property of a battery piece and a method for preparing a back contact assembly.
2. Technical proposal
The summary of the application is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. The summary of the application is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter. The technical scheme provided by the application is as follows:
As a first aspect of the present application, the present application provides a device for testing the insulation property of a thin grid of a battery piece, which comprises a test board, wherein the test board comprises a positive electrode test probe, a negative electrode test probe, a positive electrode conductive board, a negative electrode conductive board and an insulating board, the test probe and the conductive board are both arranged on the insulating board, the positive electrode test probe is electrically connected with the positive electrode conductive board, and the negative electrode test probe is electrically connected with the negative electrode conductive board; the positive electrode test probe and the negative electrode test probe are mutually insulated between the positive electrode conductive plate and the negative electrode conductive plate.
Further, the positive electrode conducting plate and the negative electrode conducting plate of the test plate are respectively and electrically connected with the EL test probes; and shooting an infrared image of the battery piece after being electrified through an infrared camera.
Furthermore, the number and the relative positions of the positive electrode test probes and the negative electrode test probes are consistent with the number and the positions of the welding strips to be welded of the corresponding battery piece to be tested.
Further, the widths of the positive electrode test probe and the negative electrode test probe are larger than the width of the main grid on the battery piece.
Further, the test probe and the conductive plate are both conductive materials, including metallic conductive materials and non-metallic conductive materials.
Further, the metal conductive material adopts one of gold, silver, copper and aluminum copper alloy; the nonmetallic conductive material adopts graphite.
Further, the test probe and the conductive plate are connected to the insulating plate through adhesive.
As a second aspect of the present application, the present application provides a method for testing the insulation properties of a fine grid of a battery sheet, wherein a test board is laminated on the battery sheet on which an insulation paste is printed, the center of a test probe of the test board is aligned with a main grid of the battery sheet, and the test probe simultaneously presses the main grid and the fine grid part around the main grid on which the insulation paste is printed; then, the EL test probes are respectively and electrically connected with the positive electrode conductive plate and the negative electrode conductive plate, after being electrified, the infrared images of the battery piece are shot, and if the thin grid part between the two main grids in the images is blackened in large scale, the bad printing of the insulating adhesive in the area is judged.
As a third aspect of the present application, the present application provides a method for manufacturing a back contact assembly, wherein after the battery sheet is printed with an insulating paste and before the series welding step, the device is used to detect the fine grid insulating property of the battery sheet by using the test method, and after determining that there is no printing defect, the back contact assembly is further manufactured.
Further, the preparation method of the application specifically comprises the following steps:
Step one: placing the battery piece into a screen printer, and printing insulating glue on a preset printing position;
Step two: by using the insulation testing device and the insulation testing method, the back contact battery piece after the insulation glue is printed is tested, and whether the printing failure exists or not is judged; if the image is bright and has no obvious defect, the battery piece is used for the next step of series welding;
step three: welding a welding strip on the battery pieces to enable the battery pieces to be interconnected, obtaining a battery string, and detecting a welding effect through EL; taking out the battery strings with poor welding, reworking, and using the remaining battery strings for the next step;
step four: sequentially laying an EVA adhesive film and a welded battery string on glass, welding the battery string on a bus bar to interconnect the battery strings, and sequentially laying the EVA adhesive film and a back plate to form a laminated piece;
step five: testing the EL image of the laminate, if the image is bright and has no obvious defects, indicating that the laying is correct;
Step six: sealing the edges of the laminated piece by using a sealing tape, and then sending the laminated piece into a laminating machine for lamination;
Step seven: and taking out the laminated piece, tearing off the edge sealing adhesive tape, installing a junction box on the middle bus bar, installing a photovoltaic frame around the laminated piece by using silicone adhesive, and waiting for the curing of the insulating adhesive in the frame to obtain the finished back contact photovoltaic module.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the application has the following remarkable effects:
(1) The application designs a test board suitable for testing the fine grid insulation performance of the back contact battery piece, and the test board is pressed down to the back contact battery piece printed with the insulation glue, so that the test board is electrified and the EL image of a single battery piece is shot, the fine grid insulation performance of the battery piece to be tested is rapidly detected, and the grid line position with insufficient insulation performance can be positioned;
(2) According to the application, after the battery piece is printed with the insulating adhesive and before the series welding step, a single fine grid insulation test is added, the fine grid insulation performance of the battery piece to be tested is rapidly detected through the insulation test board combined with the EL test, and the grid line position with insufficient insulation performance can be positioned so as to facilitate subsequent repair, and the production efficiency and the production yield in the assembly manufacturing process are ensured.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application, are incorporated in and constitute a part of this specification. The drawings and their description are illustrative of the application and are not to be construed as unduly limiting the application.
In addition, the same or similar reference numerals denote the same or similar elements throughout the drawings. It should be understood that the figures are schematic and that elements and components are not necessarily drawn to scale.
In the drawings:
FIG. 1 is a back contact assembly process flow according to one embodiment of the application;
FIG. 2 is a schematic diagram of an exploded view of a back contact assembly fine-grid insulation test board according to one embodiment of the application;
FIG. 3 is a schematic diagram of a back contact assembly fine-grid insulation test board assembly according to one embodiment of the application;
Fig. 4 and 5 are schematic diagrams of a back contact assembly fine gate insulation test according to one embodiment of the present application.
Reference numerals in the schematic drawings illustrate:
11. An anode test probe; 12. a negative electrode test probe; 21. a positive electrode conductive plate; 22. a negative electrode conductive plate; 3. an insulating plate; 4. a battery sheet; 41. and a main gate.
Detailed Description
For a further understanding of the present application, the present application will be described in detail with reference to the drawings and examples.
Embodiments of the present application will be described in more detail below with reference to the accompanying drawings. While certain embodiments of the application have been illustrated in the accompanying drawings, it is to be understood that the application may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. It should be understood that the drawings and embodiments of the application are for illustration purposes only and are not intended to limit the scope of the present application.
It should be noted that, for convenience of description, only the portions related to the present application are shown in the drawings. Embodiments of the application and features of the embodiments may be combined with each other without conflict.
It should be noted that references to "one", "a plurality" and "a plurality" in this disclosure are intended to be illustrative rather than limiting, and those skilled in the art will appreciate that "one or more" is intended to be construed as "one or more" unless the context clearly indicates otherwise.
The application will be described in detail below with reference to the drawings in connection with embodiments.
Back contact batteries are a new type of battery technology, and in the current production process, research and development personnel often focus attention on testing the IV characteristics of the battery piece by various means, and the IV characteristics are used for reflecting the insulation performance. And because the special interdigital grid line structure of back contact battery, if want to test its thin grid insulation, need each main grid on the battery piece to cover with the test probe, the probe on the adjacent main grid is insulated each other, can not have electric connection, it is comparatively difficult in the implementation of test. Therefore, the current technical scheme is to directly weld the battery piece series printed with the insulating glue into a battery string, then shoot the EL image of the battery string, and detect the welding effect of the battery piece and the printing effect of the insulating glue at the same time, so as to reversely push the printing of the insulating glue to judge whether the problem exists. It can be said that the observation of the welding effect by the EL test in the production process of the back contact battery assembly and the indirect observation and judgment of the fine grid insulation performance while the welding effect is tested have become a popular method in the industry.
However, the inventor considers through analysis that the judging method has two significant defects: firstly, the observed short circuit of the battery piece is not necessarily caused by poor printing of insulating adhesive, and the short circuit is possibly caused by overlarge deviation of a welding strip, insufficient welding of the welding strip and the like in the series welding process, and further manual judgment is needed to judge whether the observed short circuit is caused by poor printing or poor series welding, so that difficulty is brought to positioning and improving of process problem points, and production efficiency is reduced. Secondly, even if the short circuit is caused by poor printing of the insulating adhesive, the single short-circuit battery piece is already interconnected with other normal battery pieces to form a battery string, the repair workload is large and even the repair cannot be performed, and the whole string is often only degraded or discarded, so that the production yield is reduced.
Based on the above analysis, referring to fig. 2 and 3, one embodiment of the present application devised a test board for use in a fine-grid insulation test. The test board comprises a positive electrode test probe 11, a negative electrode test probe 12, a positive electrode conductive board 21, a negative electrode conductive board 22 and an insulating board 3, wherein the test probe and the conductive board are all connected to the insulating board 3 through adhesive, the positive electrode test probe 11 is electrically connected with the positive electrode conductive board 21, and the negative electrode test probe 12 is electrically connected with the negative electrode conductive board 22. The positive and negative electrode test probes and the positive and negative electrode conductive plates are not electrically connected. The insulating plate 3 is made of a material including but not limited to a PET plate, a PC plate, and a PVC plate, and the test probe and the conductive plate are made of conductive materials, including metals such as gold, silver, copper, alloys such as aluminum copper alloy, and non-metallic conductive materials such as graphite. The number and the relative positions of the test probes are consistent with the number and the positions of the welding strips welded at the follow-up time of the corresponding battery piece 4 to be tested, and the test probes are arranged in a staggered manner. The width of the test probe needs to be slightly wider than that of the main grid 41, and the specific size of the test probe can be adjusted according to actual test requirements. The dimensions of the conductive plate are preferably such that the external EL test probe dimensions are satisfied.
The method for testing the fine grid insulation property by using the test board comprises the following steps: during testing, the test board is pressed onto the battery piece 4 printed with the insulating glue, the center of the test probe of the test board is aligned with the main grid 41 of the battery piece, and the test probe simultaneously presses the main grid 41 and the fine grid part printed with the insulating glue around the main grid 41. Then, the EL test probes are respectively pressed on the positive electrode conductive plate and the negative electrode conductive plate, after the battery piece is electrified, an infrared image of the battery piece is shot, and if the thin grid part between the two main grids in the image is blackened in a large scale, the poor printing of the insulating adhesive in the area is judged.
In another specific embodiment of the application, the test board for testing the insulation property of the fine grid of the 166-10BB half back contact battery piece is provided, wherein the number of the positive and negative electrode test probes is 5, the width of the test probes is consistent with the pad point width of the battery piece, the width of the test probes is 2.1mm, the length of the main grid of the test probes is consistent, the length of the main grid of the test probes is 90mm, and the depth of the test probes is 5mm. The conducting plates connected with the test probes are also made of copper, 19mm in length direction, 5mm in width and 3mm in thickness of the battery piece. During testing, the side of the battery piece with the grid line faces upwards, the probe on the test board is pressed onto the main grid of the battery piece, as shown in fig. 4 and 5, then the probes of the external EL power supply are respectively pressed onto the positive and negative electrode conductive plates, and the EL image of the battery piece can be shot after the power is applied.
According to the application, the test board is pressed down onto the back contact battery piece after the insulating glue is printed, and the thin grid insulating property of the battery piece to be tested is rapidly detected by electrifying the test board and shooting the EL image of the single battery piece, so that the grid line position with insufficient insulating property can be positioned, the subsequent repair is convenient, and the production efficiency in the assembly manufacturing process is ensured.
In connection with fig. 1, another embodiment of the present application provides a method for preparing a back contact assembly, which includes the steps of:
Step one: placing the battery piece into a screen printer, and printing insulating glue on a preset printing position;
Step two: by using the insulation testing device and the insulation testing method of the embodiment of the application, the back contact battery after the insulation paste is printed is tested, and whether the printing failure exists or not is judged; if the image is bright and has no obvious defect, the battery piece is used for the next step of series welding;
Step three: welding the battery pieces printed with the insulating glue by using a series welding machine, welding strips on the battery pieces, and interconnecting the battery pieces to obtain a battery string, and detecting a welding effect through EL; taking out the battery strings with poor welding, reworking, and using the remaining battery strings for the next step;
step four: sequentially laying an EVA adhesive film and a welded battery string on glass, welding the battery string on a bus bar to interconnect the battery strings, and sequentially laying the EVA adhesive film and a back plate to form a laminated piece;
step five: testing the EL image of the laminate, if the image is bright and has no obvious defects, indicating that the laying is correct;
Step six: sealing the edges of the laminated piece by using a sealing tape, and then sending the laminated piece into a laminating machine for lamination;
step seven: and taking out the laminated piece, tearing off the edge sealing adhesive tape, installing a junction box on the middle bus bar, installing a photovoltaic frame around the laminated piece by using silicone adhesive, and waiting for the curing of the insulating adhesive in the frame to obtain the finished back contact photovoltaic module.
According to the application, by designing the test board suitable for testing the fine grid insulation performance of the back contact battery piece and combining with the EL test, an independent fine grid insulation test is added after the battery piece is printed with the insulation adhesive and before the series welding step, the fine grid insulation performance of the battery piece to be tested is rapidly detected, and the grid line position with insufficient insulation performance can be positioned so as to facilitate the subsequent repair, and the production efficiency and the production yield in the assembly manufacturing process are ensured.
The above description is only illustrative of the few preferred embodiments of the present application and of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the application in the embodiments of the present application is not limited to the specific combination of the above technical features, but also encompasses other technical features formed by any combination of the above technical features or their equivalents without departing from the spirit of the application. Such as the above-described features, are mutually replaced with the technical features having similar functions (but not limited to) disclosed in the embodiments of the present application.
Claims (10)
1. The utility model provides a battery piece fine grid insulation testing arrangement which characterized in that: the testing device comprises a testing board, wherein the testing board comprises an anode testing probe (11), a cathode testing probe (12), an anode conducting board (21), a cathode conducting board (22) and an insulating board (3), the testing probe and the conducting board are arranged on the insulating board (3), the anode testing probe (11) is electrically connected with the anode conducting board (21), and the cathode testing probe (12) is electrically connected with the cathode conducting board (22); the positive electrode test probe (11) and the negative electrode test probe (12) are insulated from each other, and the positive electrode conductive plate (21) and the negative electrode conductive plate (22) are insulated from each other.
2. The battery cell fine grid insulation testing device according to claim 1, wherein: the positive electrode conducting plate (21) and the negative electrode conducting plate (22) of the test plate are respectively and electrically connected with the EL test probes; and shooting infrared images of the battery piece (4) after being electrified through an infrared camera.
3. The battery cell fine grid insulation testing device according to claim 2, wherein: the number and the relative positions of the positive electrode test probes (11) and the negative electrode test probes (12) are consistent with the number and the positions of the welding strips to be welded of the corresponding battery piece (4) to be tested.
4. A battery cell fine grid insulation testing device according to claim 3, wherein: the widths of the positive electrode test probe (11) and the negative electrode test probe (12) are larger than the width of the main grid (41) on the battery piece (4).
5. The battery cell fine grid insulation testing device according to claim 4, wherein: the test probe and the conductive plate are made of metal conductive materials or nonmetal conductive materials.
6. The battery cell fine grid insulation testing device according to claim 5, wherein: the metal conductive material adopts one of gold, silver, copper and aluminum copper alloy; the nonmetallic conductive material adopts graphite.
7. The battery cell fine grid insulation testing device according to claim 6, wherein: the test probe and the conductive plate are connected to the insulating plate (3) through adhesive.
8. A method for testing the fine grid insulation of a battery piece by using the device as claimed in any one of claims 1 to 7, which is characterized in that: the testing board is pressed and covered on the battery piece (4) printed with the insulating glue, the center of the testing probe of the testing board is aligned with the main grid (41) of the battery piece, and the testing probe simultaneously presses and covers the main grid (41) and the fine grid part printed with the insulating glue around the main grid (41); then, the EL test probes are respectively electrically connected with the positive electrode conductive plate (21) and the negative electrode conductive plate (22), and after the electric conduction, the infrared image of the battery piece (4) is shot, if the thin grid part between the two main grids (41) in the image is blackened in large scale, the bad printing of the insulating adhesive in the area is judged.
9. A method for preparing a back contact assembly, which is characterized in that: after the battery piece is printed with the insulating adhesive and before the series welding step, the testing method of claim 8 is adopted to detect the fine grid insulating property of the battery piece, and after the fact that no printing defect exists is determined, the back contact assembly is further prepared.
10. The method of manufacturing a back contact assembly of claim 9, comprising the steps of:
Step one: placing the battery piece into a screen printer, and printing insulating glue on a preset printing position;
Step two: by using the insulation testing device and the insulation testing method, the back contact battery piece after the insulation glue is printed is tested, and whether the printing failure exists or not is judged; if the image is bright and has no obvious defect, the battery piece is used for the next step of series welding;
step three: welding a welding strip on the battery pieces to enable the battery pieces to be interconnected, obtaining a battery string, and detecting a welding effect through EL; taking out the battery strings with poor welding, reworking, and using the remaining battery strings for the next step;
step four: sequentially laying an EVA adhesive film and a welded battery string on glass, welding the battery string on a bus bar to interconnect the battery strings, and sequentially laying the EVA adhesive film and a back plate to form a laminated piece;
step five: testing the EL image of the laminate, if the image is bright and has no obvious defects, indicating that the laying is correct;
Step six: sealing the edges of the laminated piece by using a sealing tape, and then sending the laminated piece into a laminating machine for lamination;
Step seven: and taking out the laminated piece, tearing off the edge sealing adhesive tape, installing a junction box on the middle bus bar, installing a photovoltaic frame around the laminated piece by using silicone adhesive, and waiting for the curing of the insulating adhesive in the frame to obtain the finished back contact photovoltaic module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410431803.6A CN118039521B (en) | 2024-04-11 | Device and method for testing insulation property of thin grid of battery piece and preparation method of back contact assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410431803.6A CN118039521B (en) | 2024-04-11 | Device and method for testing insulation property of thin grid of battery piece and preparation method of back contact assembly |
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| CN118039521A true CN118039521A (en) | 2024-05-14 |
| CN118039521B CN118039521B (en) | 2024-07-02 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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