Back contact cell scratch protection device

Abstract

The utility model discloses a back contact battery anti -scratch device, including work table, the top surface of work table is fixedly arranged and is prevented to scratch the layer, and the scratch layer is made of silica gel material. Back contact battery anti -scratch device of the utility model, the top surface of work table is fixedly arranged and is prevented to scratch the layer, and the scratch layer is made of silica gel material, when back contact battery is repaired, the front surface of battery piece is contacted with the scratch layer made of silica gel material, and the scratch layer surface is soft, and the corner also can not scratch the light receiving surface of back contact battery, prevent the light receiving surface of battery piece from scratching, and influence battery piece light conversion efficiency.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic cell technology, and more specifically, to a back contact battery anti-scratch device. Background Technology

[0002] Back-contact solar cells are a type of solar cell technology that integrates both positive and negative electrode metals on the back of the cell. Their grid-free design on the front allows for the absorption of more sunlight. This technology combines aesthetics with high power generation efficiency, making it particularly suitable for distributed photovoltaic and commercial / industrial rooftop applications.

[0003] The front of the battery is the sun-receiving surface. Scratches on this surface cause irreversible damage to electrical performance parameters such as cell efficiency and opening voltage. Experiments show that scratches on the sun-receiving surface lead to a 5-7mV reduction in opening voltage and a 1%-2% decrease in cell efficiency. To prevent scratches on the sun-receiving surface, the main solutions are as follows:

[0004] Battery side: The scratch problem is mainly concentrated in the stacking of battery cells after testing and sorting. The back-light side of the electrode of the previous battery is prone to scratching the light-receiving side of the next battery. Currently, the main solution is to add a separator paper for protection after testing and sorting.

[0005] Component end: Scratches in the component manufacturing process are concentrated in the processes before lamination. The main protection measures are to ensure that the light-receiving surface is facing upwards and to avoid contact during the process. Automated equipment reduces human intervention, and soft materials are used for contact belts and suction cups.

[0006] Paper-based protection is only applicable to stacking scenarios and cannot solve the problem of forced contact with the light-receiving side facing down during rework. However, from the module side, there are currently no corresponding protective measures for the rework process of defective strings. The rework process of defective strings mainly involves replacing or otherwise processing defective cells detected by EL detection before stringing and lamination after cell stringing. The solder ribbons fixing the back contact cells are all on the back side, so this process must be carried out with the light-receiving side facing down, and the light-receiving side directly contacts the rework heating platform. The heating platform is generally an aluminum alloy metal plate, and the process of disassembling the solder ribbons to replace the cells is also problematic. This process can cause the battery string to slide uncontrollably. The heating platform is mainly made of metal plates, which are relatively hard and their edges can easily scratch the light-receiving surface of the battery in contact with the back. The rework process for defective strings mainly involves using a soldering iron to disassemble or solder the solder strips on the back of the battery cells. This involves forces from all directions, and the smooth metal plate of the heating platform causes the battery string to slide on the heating plate, resulting in scratches. During rework, the soldering iron is used to melt the solder to separate the solder strips from the battery cell electrodes. This process can easily cause solder residue to fall onto the heating platform. If the solder residue comes into contact with the front of the battery cell, it can cause scratches.

[0007] Therefore, it is necessary to propose a back-contact battery anti-scratch device to solve the problems existing in the prior art. Utility Model Content

[0008] The utility model description section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. This utility model description section is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0009] To address the aforementioned issues, this utility model provides a back-contact battery anti-scratch device, comprising a worktable, with an anti-scratch layer fixedly disposed on the top surface of the worktable, the anti-scratch layer being made of silicone material.

[0010] Preferably, the top surface of the scratch-resistant layer has a serrated structure.

[0011] Preferably, each tooth of the serrated structure is triangular in shape, with a tooth height of 1-5 mm and a tooth width of 0.5-5 mm.

[0012] Preferably, the tooth height of the serration is 2mm and the tooth width of the serration is 2mm.

[0013] Preferably, a tooth groove is formed between adjacent teeth, and a groove is opened at the bottom of the tooth groove, with the bottom surface of the groove being arc-shaped.

[0014] Preferably, a support plate is provided inside the anti-scratch layer, and the support plate is located near the bottom surface inside the anti-scratch layer. Multiple longitudinal plates are arranged in an array on the top surface of the support plate, and the positions of the longitudinal plates correspond to the positions of the teeth tips of the serrations.

[0015] Preferably, the spacing between the longitudinal plates is the same as the spacing between the saw teeth, and the height of the longitudinal plates is less than the height of the saw teeth.

[0016] Preferably, the longitudinal plates are arranged parallel to the saw teeth.

[0017] Preferably, the width of the support plate and the longitudinal plate is smaller than the width of the anti-scratch layer.

[0018] Preferably, the support plate and the longitudinal plate are made of metal.

[0019] Compared with the prior art, the present invention has at least the following beneficial effects:

[0020] The anti-scratch device for back contact batteries described in this utility model has an anti-scratch layer fixedly installed on the top surface of the workbench. The anti-scratch layer is made of silicone material. When the back contact battery is being repaired, the front of the battery cell comes into contact with the anti-scratch layer made of silicone material. The surface of the anti-scratch layer is soft, and the edges and corners will not scratch the light-receiving surface of the back contact battery, thus preventing scratches on the light-receiving surface of the battery cell and affecting the light conversion efficiency of the battery cell.

[0021] The surface of the scratch-resistant layer made of silicone material has a higher coefficient of friction than that of the heating platform made of metal. The battery cells placed on the scratch-resistant layer can reduce slippage, thereby reducing the risk of scratches.

[0022] The top surface of the anti-scratch layer is serrated. When removing or soldering the solder strips, the falling solder dross will fall into the grooves between the serrations, so no solder dross will remain on the surface of the anti-scratch layer and will not scratch the battery cells placed on the anti-scratch layer.

[0023] The back contact battery anti-scratch device of this utility model, other advantages, objectives and features of this utility model will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this utility model. Attached Figure Description

[0024] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0025] Figure 1 This is a schematic diagram of the back contact battery anti-scratch device disclosed in this utility model.

[0026] Figure 2 This is a schematic diagram of the anti-scratch layer disclosed in this utility model;

[0027] Figure 3 This is a cross-sectional structural schematic diagram of the anti-scratch device for back contact batteries disclosed in this utility model.

[0028] Figure 4 This is a schematic diagram of the battery anti-scratch device with through holes disclosed in this utility model. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments, so that those skilled in the art can implement it based on the description.

[0030] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0031] like Figure 1 Figure 3 As shown, a back-contact battery anti-scratch device includes a workbench 1, and an anti-scratch layer 2 is fixedly installed on the top surface of the workbench 1. The anti-scratch layer 2 is made of silicone material.

[0032] Furthermore, the top surface of the anti-scratch layer 2 has a serrated structure.

[0033] Furthermore, each tooth 3 of the serrated structure is triangular in shape, with a tooth height of 1-5mm and a tooth width of 0.5-5mm.

[0034] Furthermore, the tooth height of the saw tooth 3 is 2mm, and the tooth width of the saw tooth 3 is 2mm.

[0035] Furthermore, a tooth groove 4 is formed between adjacent saw teeth 3, and a groove 5 is opened at the bottom of the tooth groove 4, with the bottom surface of the groove 5 being arc-shaped.

[0036] Furthermore, a support plate 6 is provided inside the anti-scratch layer 2. The support plate 6 is located inside the anti-scratch layer 2 near the bottom surface. Multiple longitudinal plates 7 are arranged in an array on the top surface of the support plate 6. The position of the longitudinal plates 7 corresponds to the position of the tooth tip of the serration 3.

[0037] Furthermore, the spacing between the longitudinal plates 7 is the same as the spacing between the saw teeth 3, and the height of the longitudinal plates 7 is less than the height of the saw teeth 3.

[0038] Furthermore, the longitudinal plate 7 is arranged parallel to the saw teeth 3.

[0039] Furthermore, the widths of the support plate 6 and the longitudinal plate 7 are smaller than the width of the anti-scratch layer 2.

[0040] Furthermore, the support plate 6 and the longitudinal plate 7 are made of metal.

[0041] The working principle of the above technical solution:

[0042] Back-contact batteries lack front-side metal grids, whereas traditional batteries' front-side metal grids not only conduct electricity but also provide some mechanical protection. Back-contact batteries, by moving all electrodes to the back and lacking a front-side metal structure, suffer from a lack of physical support, making them more susceptible to external damage. To improve light absorption efficiency, back-contact batteries are typically designed with a smooth or low-texture front surface, which weakens their scratch resistance. In contrast, the textured surface of traditional batteries can reduce scratches by dispersing stress.

[0043] The conversion efficiency of photovoltaic cells decreases significantly with increasing temperature. To eliminate the impact of temperature differences, the International Electrotechnical Commission (IEC) has established standard testing conditions. A crucial aspect of this is strictly controlling the temperature of the cells / modules at 25°C. Therefore, the photovoltaic cell workbench is a heated workbench. A scratch-resistant layer 2 is fixedly installed on the top surface of workbench 1. Made of silicone, this layer has a wide temperature resistance range, good elasticity, and can buffer mechanical impacts, reducing the risk of breakage of brittle solar cells. It also reduces scratches on the light-receiving surface of the back-contacting cells when they come into contact with the workbench.

[0044] The top surface of the anti-scratch layer 2 has a serrated structure. Each serration 3 of the serrated structure is triangular in shape. The tooth height of the serration 3 is 1-5mm, and the tooth width of the serration 3 is 0.5-5mm. Preferably, the tooth height is 2mm and the tooth width is 2mm.

[0045] The serrations 3 form grooves 4, allowing solder slag or foreign objects that fall off during welding to slide directly into the grooves 4, avoiding scratches caused by foreign objects remaining on the contact surface. The serrated structure increases the friction between the battery cell and the anti-scratch layer 2. The coefficient of friction of the serrated silicone surface is usually increased by 30% to 100% after optimization, reducing the risk of battery cell slippage during operation and reducing scratches.

[0046] The anti-scratch layer 2 is made of silicone material, and the top surface of the anti-scratch layer 2 is set with a serrated structure. The scratches and microcracks of the battery cells can be detected by EL infrared. The actual scratch rate was reduced from 80% to 10%, the battery efficiency degradation was reduced to 0.2-0.5%, and the rework time was reduced by 50%.

[0047] The bottom of the groove 4 formed between adjacent serrations 3 is sharp, making it difficult to clean up fallen solder or foreign objects. Therefore, a groove 5 is opened at the bottom of the groove 4. The bottom surface of the groove 5 is arc-shaped. There are no dead corners in the groove 5, and fallen solder and foreign objects can be cleaned along the length of the groove 5.

[0048] The saw teeth 3, made of silicone, are prone to deformation in the width direction when the battery cell is subjected to lateral force. Although there is no relative movement between the battery cell and the saw teeth 3, the position of the battery cell will change, which may cause deviation during welding. To prevent the battery cell from shifting during operation, a support plate 6 is set inside the anti-scratch layer 2. The support plate 6 is located near the bottom surface of the anti-scratch layer 2. Multiple longitudinal plates 7 are arrayed on the top surface of the support plate 6. The position of the longitudinal plates 7 corresponds to the position of the tooth tip of the saw teeth 3. The spacing of the longitudinal plates 7 is the same as the spacing of the saw teeth 3. The height of the longitudinal plates 7 is less than the height of the saw teeth 3. The width of the support plate 6 and the longitudinal plates 7 is less than the width of the anti-scratch layer 2, so that the anti-scratch layer 2 can completely wrap the support plate 6 and the longitudinal plates 7. All parts in contact with the battery cell are made of silicone to prevent the battery cell from being scratched.

[0049] The support plate 6 and the longitudinal plate 7 are made of metal, which can be used for heat conduction to keep the scratch-resistant layer 2 at the required temperature for cell testing.

[0050] The beneficial effects of the above technical solution are as follows:

[0051] The anti-scratch device for back contact batteries described in this utility model has an anti-scratch layer fixedly installed on the top surface of the workbench. The anti-scratch layer is made of silicone material. When the back contact battery is being repaired, the front of the battery cell comes into contact with the anti-scratch layer made of silicone material. The surface of the anti-scratch layer is soft, and the edges and corners will not scratch the light-receiving surface of the back contact battery, thus preventing scratches on the light-receiving surface of the battery cell and affecting the light conversion efficiency of the battery cell.

[0052] In one embodiment, such as Figure 4 As shown, the anti-scratch layer 2 is made of silicone material. The top surface of the anti-scratch layer 2 has a rectangular array of multiple rows and columns of through holes 8. The diameter of the through holes 8 is 2mm, and the spacing between two adjacent rows and two adjacent columns is 3mm. The through holes 8 penetrate the workbench 1 below the anti-scratch layer 2. Solder or foreign objects that fall during operation can fall directly from the through holes. After the battery is repaired, it is easier to clean the surface.

[0053] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0054] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0055] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A back-contact battery anti-scratch device, characterized in that, Includes a workbench (1), and a scratch-resistant layer (2) is fixedly installed on the top surface of the workbench (1). The scratch-resistant layer (2) is made of silicone material. The top surface of the anti-scratch layer (2) has a serrated structure.

2. The anti-scratch device for back contact batteries according to claim 1, characterized in that, Each tooth (3) of the serrated structure is triangular in shape, with a tooth height of 1-5 mm and a tooth width of 0.5-5 mm.

3. The anti-scratch device for back contact batteries according to claim 2, characterized in that, The tooth height of the saw tooth (3) is 2mm, and the tooth width of the saw tooth (3) is 2mm.

4. The anti-scratch device for back contact batteries according to claim 3, characterized in that, A tooth groove (4) is formed between adjacent saw teeth (3), and a groove (5) is opened at the bottom of the tooth groove (4), with the bottom surface of the groove (5) being arc-shaped.

5. The anti-scratch device for back contact batteries according to claim 2, characterized in that, A support plate (6) is set inside the anti-scratch layer (2). The support plate (6) is set inside the anti-scratch layer (2) near the bottom surface. Multiple longitudinal plates (7) are arranged in an array on the top surface of the support plate (6). The position of the longitudinal plates (7) corresponds to the position of the tooth tip of the serration (3).

6. The anti-scratch device for back contact batteries according to claim 5, characterized in that, The spacing of the longitudinal plates (7) is the same as the spacing of the saw teeth (3), and the height of the longitudinal plates (7) is less than the height of the saw teeth (3).

7. The anti-scratch device for back contact batteries according to claim 5, characterized in that, The longitudinal plate (7) is set parallel to the saw teeth (3).

8. The anti-scratch device for back contact batteries according to claim 5, characterized in that, The width of the support plate (6) and the longitudinal plate (7) is smaller than the width of the anti-scratch layer (2).

9. The anti-scratch device for back contact batteries according to claim 5, characterized in that, The support plate (6) and the longitudinal plate (7) are made of metal.

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