Anti-widening device for laser process of back contact solar cell
By using baffles and positioning frames of different sizes and shapes in the laser manufacturing process of back-contact solar cells to prevent widening, the widening problem caused by laser thermal effects was solved, improving the stability and efficiency of the cell's isolation zone and reducing production costs.
Patent Information
- Application Number
- CN202423061044.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-11
- Publication Date
- 2025-11-11
- Estimated Expiration
- 2034-12-11
AI Technical Summary
In the laser fabrication process of back-contact solar cells, the widening phenomenon caused by laser thermal effect affects the stability of the isolation region of the cell, which in turn affects current collection and cell efficiency.
An anti-widening device is adopted, which includes a first baffle and a second baffle with different sizes and shapes, combined with a positioning frame, to block the laser thermal effect area and adapt to the processing requirements of different battery cell structures.
This effectively solves the problem of widening during laser processing, improves the stability of the isolation zone of back-contact solar cells, increases the efficiency of the cells, and reduces production costs.
Smart Images
Figure CN223531672U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of photovoltaic manufacturing, specifically to an anti-widening device for laser processing of back-contact solar cells. Background Technology
[0002] Back-contact solar cells are cell structures where both the positive and negative electrodes are located on the back side, with no grid lines obstructing the front. This effectively increases light absorption and short-circuit current. This design allows the cell to maximize sunlight utilization without grid obstruction, resulting in higher conversion efficiency. Because there are no metal grid lines on the front of the back-contact cell, light transmission is more direct, reducing light reflection and obstruction, thus increasing short-circuit current and open-circuit voltage. Back-contact cells also have a higher fill factor and an open-circuit voltage close to the theoretical limit, further improving cell efficiency.
[0003] With the continuous advancement of laser technology, the problem of laser damage to solar cells has been effectively solved, thus accelerating the development of the industry. However, the influence of laser thermal effects still exists when processing films of different densities, especially after combining with wet cleaning, where the opened film area may widen to varying degrees. During laser processing, this widening phenomenon reduces the stability of the isolation region of the back-contact solar cell, which may affect the long-term performance of the cell, particularly in terms of current collection and cell efficiency. Utility Model Content
[0004] To address the technical problems mentioned in the prior art, this application proposes an anti-widening device for laser processing of back-contact solar cells.
[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:
[0006] An anti-widening device for laser fabrication of back-contact solar cells, comprising:
[0007] At least two first baffles, each of which has a first light-transmitting structure, and the size and / or shape of the first light-transmitting structures of the at least two first baffles are different;
[0008] At least two second baffles, each baffle having a second light-transmitting structure, wherein the size and / or shape of the second light-transmitting structures of the at least two second baffles are different;
[0009] A positioning frame is used to support and position the first baffle or the second baffle above the target battery cell.
[0010] In some embodiments, the first light-transmitting structure includes a plurality of spaced-apart first light-transmitting holes, which extend along a first direction toward both sides of the first baffle and terminate inside the first baffle.
[0011] In some embodiments, the spacing between adjacent first light-transmitting holes is 0.5 mm to 1.5 mm.
[0012] In some embodiments, the second light-transmitting structure includes two sets of light-transmitting units, which are arranged along the second direction on the second baffle.
[0013] The light-transmitting unit includes a plurality of second light-transmitting holes spaced apart along a third direction. The second light-transmitting holes extend along a second direction toward one side of the second baffle and another group of the light-transmitting units, and terminate inside the second baffle.
[0014] From a third-party perspective, the second light-transmitting holes of the two sets of light-transmitting units are arranged alternately;
[0015] The third direction is perpendicular to the second direction.
[0016] In some embodiments, the second light-transmitting aperture includes a main grid aperture extending along a second direction and a plurality of solder point holes spaced apart on the main grid aperture along the second direction.
[0017] In some embodiments, the spacing between adjacent main gate holes is 18mm to 20mm in the third direction.
[0018] In some embodiments, the positioning frame includes a positioning frame and support feet disposed on the positioning frame. The positioning frame includes a hollow area, a receiving plate surrounding the outer periphery of the hollow area, and adjusting members disposed one-to-one at the four corners of the receiving plate. The four adjusting members enclose a bearing space.
[0019] The adjusting component includes at least two fixed positions, which are arranged at intervals on a virtual line connecting the midpoint of the hollow area and the vertex of the corresponding corner.
[0020] In some embodiments, the adjusting member and the receiving plate have a fixing structure, the fixing structure including a guide groove disposed on the receiving plate, a guide block slidably connected to the guide groove, and a locking member for locking the relative position of the guide groove and the guide block, wherein the axis of the guide groove in the length direction is collinear with the virtual line, and the adjusting member is disposed on the guide block;
[0021] The adjusting component includes two plates, which are symmetrically arranged along the virtual line and perpendicular to each other.
[0022] In some embodiments, an identification structure is also included for identifying the dimensions of at least two of the fixed positions corresponding to the bearing space. The identification structure is disposed on the receiving plate and located on at least one side of the guide groove in the width direction.
[0023] In some embodiments, the marking structure includes scale lines and / or scale values recessed inward from the top surface of the receiving plate.
[0024] Due to the application of the above technical solution, the beneficial effects of this application compared with the prior art are as follows:
[0025] The anti-widening device involved in this application can block the thermal effect area of the laser during the laser process, effectively solving the widening problem caused by the laser processing, improving the stability of the isolation area of the back contact solar cell, and thus improving the efficiency of the cell.
[0026] This device, by incorporating multiple first and second baffles with different sizes and shapes of light-transmitting structures, combined with a positioning frame design, allows the first and second baffles to be used in any combination as needed, thus adapting to the processing requirements of different solar cell structures and exhibiting high versatility. The structure is simple, low-cost, and flexibly adjustable to meet the processing requirements of different types of solar cells, effectively reducing production costs while ensuring high processing accuracy. Attached Figure Description
[0027] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0028] Figure 1 This is a schematic diagram of the structure of the first baffle in one embodiment of the present invention;
[0029] Figure 2 This is a schematic diagram of the structure of the second baffle in one embodiment of the present invention;
[0030] Figure 3 This is a schematic diagram of the positioning frame in one embodiment of the present invention.
[0031] Explanation of reference numerals in the attached figures:
[0032] 1-First baffle; 2-Second baffle; 3-Positioning frame; 31-Hollowed area; 32-Supporting plate; 33-Adjusting component; 331-Plate body; 4-Supporting foot; 5-Fixing structure; 51-Guide groove; 52-Guide slider; 53-Guide hole; 6-Identification structure; 7-First light-transmitting hole; 8-Second light-transmitting hole; 81-Main grid hole; 82-Welding point hole. Detailed Implementation
[0033] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.
[0034] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.
[0035] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.
[0036] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.
[0037] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.
[0038] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.
[0039] Please see Figures 1 to 3 One embodiment of this application provides an anti-widening device for laser processing of back-contact solar cells, including at least two first baffles 1, at least two second baffles 2, and a positioning frame, wherein the positioning frame is used to support and position the first baffles 1 or the second baffles 2 above the target solar cell.
[0040] Specifically, the first baffle 1 has a first light-transmitting structure, and the first light-transmitting structures of at least two first baffles 1 are different in size and / or shape.
[0041] In some embodiments, the first light-transmitting structure includes a plurality of spaced-apart first light-transmitting holes 7, which extend along a first direction toward both sides of the first baffle 1 and terminate inside the first baffle 1. In other words, the first light-transmitting holes 7 are the same as the fine grid structure of the target solar cell.
[0042] It should be noted that the first direction is as follows: Figure 1 As indicated by the middle arrow a,
[0043] In some embodiments, the spacing between adjacent first light-transmitting holes 7 is 0.5mm to 1.5mm. Specifically, the spacing between adjacent first light-transmitting holes 7 can be 0.5mm, 1mm, or 1.5mm, and this application does not impose a specific limitation on this.
[0044] The second baffle 2 has a second light-transmitting structure, and the size and / or shape of the second light-transmitting structure of at least two second baffles 2 are different.
[0045] In some embodiments, the second light-transmitting structure includes two sets of light-transmitting units arranged along a second direction on the second baffle 2. Each light-transmitting unit includes a plurality of second light-transmitting holes 8 spaced apart along a third direction. The second light-transmitting holes 8 extend along the second direction toward one side of the second baffle 2 and the other set of light-transmitting units, terminating inside the second baffle 2. In the third direction, the second light-transmitting holes 8 of the two sets of light-transmitting units are arranged alternately, and the third direction is perpendicular to the second direction.
[0046] In detail, the second light-transmitting hole 8 includes a main grid hole 81 extending along the second direction and a plurality of solder joint holes 82 spaced apart on the main grid hole 81 along the second direction. In other words, the second light-transmitting hole 8 is the same as the main grid structure and solder joint structure of the target solar cell.
[0047] It should be noted that the second direction, such as Figure 2 As shown by the middle arrow b, the third direction is as follows: Figure 2 As indicated by the middle arrow c.
[0048] In some embodiments, the spacing between adjacent main gate holes 81 in the third direction is 18mm to 20mm. Specifically, the spacing between adjacent main gate holes 81 can be 18mm, 19mm, or 20mm, and in other embodiments, it can also be 15mm, 16mm, 17mm, or 21mm. This application does not impose a specific limitation on this.
[0049] In some embodiments, the positioning frame includes a positioning frame 3 and support feet 4 disposed on the positioning frame 3. The positioning frame 3 includes a hollow area 31, a receiving plate 32 surrounding the outer periphery of the hollow area 31, and adjusting members 33 arranged one-to-one at the four corners of the receiving plate 32. The four adjusting members 33 enclose a bearing space. The adjusting members 33 include at least two fixed positions, which are spaced apart on a virtual line connecting the midpoint of the hollow area 31 and the vertex of the corresponding corner.
[0050] In some embodiments, the adjusting member 33 and the receiving plate 32 have a fixing structure 5. The fixing structure 5 includes a guide groove 51 disposed on the receiving plate 32, a guide block 52 slidably connected to the guide groove 51, and a locking member (not shown) for locking the relative position of the guide groove 51 and the guide block 52. The axis of the guide groove 51 in the length direction is collinear with the virtual line, and the adjusting member 33 is disposed on the guide block 52. The adjusting member 33 includes two plates 331, which are symmetrically arranged along the virtual line and perpendicular to each other.
[0051] In detail, guide holes 53 are provided on both sides of the guide groove 51 in the width direction. The guide holes 53 extend along the length direction of the guide groove 51, and the locking member passes through the guide holes 53 to fix it to the guide slider 52. The cross-section of the guide slider 52 is "L" shaped. In this embodiment, the locking member is specifically a bolt. The head end of the bolt is located below the outer edge plate, and the tail end passes through the guide hole 53 to be threadedly connected to the bottom of the guide slider 52.
[0052] In some embodiments, an identification structure 6 is also included to identify the dimensions of the bearing space corresponding to at least two fixed positions. The identification structure 6 is disposed on the receiving plate 32 and located on at least one side of the guide groove 51 in the width direction. That is, the bearing space formed by the adjusting member 33 when it is in any fixed position corresponds to the size that can accommodate the first baffle 1 or the second baffle 2.
[0053] In detail, the marking structure 6 includes scale lines and / or scale values that are recessed inward from the top surface of the receiving plate 32. By setting the scale lines and scale values to an inwardly recessed structure, wear and tear over long-term use can be avoided. Admittedly, in other embodiments, the marking structure 6 may also be configured to protrude outward from the top surface of the outer edge plate. This application does not specifically limit this.
[0054] Finally, it should be noted that the above are merely preferred embodiments of this application and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A topspan prevention device for laser processing of back-contact solar cells, characterized in that, include: At least two first baffles, each of which has a first light-transmitting structure, and the size and / or shape of the first light-transmitting structures of the at least two first baffles are different; At least two second baffles, each baffle having a second light-transmitting structure, wherein the size and / or shape of the second light-transmitting structures of the at least two second baffles are different; A positioning frame is used to support and position the first baffle or the second baffle above the target battery cell. The positioning frame includes a positioning frame and support feet disposed on the positioning frame. The positioning frame includes a hollow area, a receiving plate surrounding the outer periphery of the hollow area, and adjustment members disposed one-to-one at the four corners of the receiving plate. The four adjustment members enclose a supporting space. Each adjustment member includes at least two fixed positions, which are spaced apart on a virtual line connecting the midpoint of the hollow area and the vertex of the corresponding corner. The adjustment member has a fixing structure with the receiving plate. The fixing structure includes a guide groove disposed on the receiving plate, a guide slider slidably connected to the guide groove, and a locking member for locking the relative position of the guide groove and the guide slider. The axis of the guide groove in the length direction is collinear with the virtual line. The adjustment member is disposed on the guide slider and includes two plates, which are symmetrically arranged along the virtual line and perpendicular to each other.
2. The anti-bend device for laser processing of back-contact solar cells as described in claim 1, characterized in that, The first light-transmitting structure includes a plurality of spaced first light-transmitting holes, which extend along a first direction toward both sides of the first baffle and terminate inside the first baffle.
3. The anti-bend device for laser processing of back-contact solar cells as described in claim 2, characterized in that, The spacing between adjacent first light-transmitting holes is 0.5mm to 1.5mm.
4. The anti-bend device for laser processing of back-contact solar cells as described in claim 2, characterized in that, The second light-transmitting structure includes two sets of light-transmitting units, which are arranged along the second direction on the second baffle. The light-transmitting unit includes a plurality of second light-transmitting holes spaced apart along a third direction. The second light-transmitting holes extend along a second direction toward one side of the second baffle and another group of the light-transmitting units, and terminate inside the second baffle. From a third-party perspective, the second light-transmitting holes of the two sets of light-transmitting units are arranged alternately; The third direction is perpendicular to the second direction.
5. The anti-bend device for laser processing of back-contact solar cells as described in claim 4, characterized in that, The second light-transmitting aperture includes a main grid aperture extending along a second direction and a plurality of solder point holes spaced apart on the main grid aperture along the second direction.
6. The anti-widening device for laser processing of back-contact solar cells as described in claim 5, characterized in that, From a third-party perspective, the spacing between adjacent main gate holes is 18mm~20mm.
7. The anti-widening device for laser processing of back-contact solar cells as described in claim 1, characterized in that, It also includes an identification structure for identifying the dimensions of at least two of the fixed positions corresponding to the bearing space, the identification structure being disposed on the receiving plate and located on at least one side of the guide groove in the width direction.
8. The anti-widening device for laser processing of back-contact solar cells as described in claim 7, characterized in that, The marking structure includes scale lines and / or scale values recessed inward from the top surface of the receiving plate.