Solar cell assembly
By designing metal interconnect sheets and fixing sheets, the problems of module deformation and performance degradation caused by high-temperature processes during the series connection of thin-film solar cells were solved, achieving efficient and low-cost cell module fabrication.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-24
- Publication Date
- 2026-03-17
AI Technical Summary
In the process of series encapsulation of thin-film solar cells, high-temperature processes cause problems such as deformation and performance degradation of the battery modules.
The structure adopts a metal interconnect and fixing plate design, and the cells are connected in series by non-welding connection. They are fixed by substrate and adhesive, avoiding high-temperature processes and ensuring cell quality and photoelectric conversion performance.
This technology enables the series connection of solar cells without the need for high-temperature processes, improving photoelectric conversion performance, reducing manufacturing costs, and minimizing the risk of module deformation and failure.
Smart Images
Figure CN224007010U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of solar cell technology, and in particular relates to a solar cell module. Background Technology
[0002] In existing technologies, thin-film solar cells possess characteristics such as high specific power and shapeability, allowing them to be attached to surfaces like airfoils and buildings to provide energy for aircraft and structures. However, the process of connecting and encapsulating several thin-film solar cells in series to form a thin-film solar module typically employs welding or lamination processes. These processes generate heat, and the thin-film cells are heat-sensitive, prone to curling that can cause module deformation or even failure, affecting photoelectric conversion efficiency. Therefore, the heat and other factors during the series fabrication of multiple thin-film solar cells can lead to potential performance issues in the thin-film solar module. Utility Model Content
[0003] To solve the above-mentioned technical problems, this utility model provides a solar cell module, which is particularly suitable for the series fabrication of several heat-sensitive thin-film batteries.
[0004] The technical solution adopted by this utility model is: a solar cell module, including multiple cells and metal interconnects, the multiple cells are arranged in sequence, and the metal interconnects are disposed between adjacent cells and contact and cooperate with the corresponding cells to be connected in series.
[0005] Furthermore, it also includes a substrate and a fixing plate, with multiple battery cells disposed on the substrate and the fixing plate bonded to the substrate to press against the surface of the metal interconnect sheet.
[0006] Furthermore, each cell has a first surface and a second surface along its thickness direction. The first surface is away from the substrate and has grid lines. One end of each metal interconnect is in contact with the second surface of the corresponding cell, and the other end is in contact with the grid lines of another cell.
[0007] Furthermore, there are multiple fixing plates, with one fixing plate placed between each adjacent cell.
[0008] Furthermore, the length of the fixing piece along the first direction is not less than the length of the battery cell along the first direction, the length of the fixing piece along the first direction is not greater than the length of the substrate along the first direction, and the first direction is perpendicular to the arrangement direction of the adjacent battery cells.
[0009] Furthermore, the metal interconnects are connected to the battery cells without welding.
[0010] Furthermore, the metal interconnect sheet is aluminum foil or silver foil, and the thickness of the metal interconnect sheet and / or substrate is no more than 100 micrometers.
[0011] The advantages and positive effects of this utility model are: due to the adoption of the above technical solution, no high-temperature process is required in the process of connecting several batteries in series, which can improve the photoelectric conversion performance of the battery cell module; it has the advantages of simple preparation process and no need for complex equipment, which can ensure preparation cost and improve photoelectric conversion performance. Attached Figure Description
[0012] Figure 1 This is a side view of one aspect of the present invention.
[0013] Figure 2 This is a top view structural diagram of this utility model;
[0014] In the picture:
[0015] 1. Solar cell 2. Substrate 3. Metal interconnect sheet
[0016] 4. Fixing plate 5. Adhesive Detailed Implementation
[0017] The embodiments of the present invention will be described below with reference to the accompanying drawings. The described embodiments are only some embodiments of the present invention, and not all embodiments.
[0018] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar units or units having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.
[0019] In the description of this utility model, it should be understood that terms such as "installation", "connection", and "fixation" should be interpreted broadly, and can refer to direct connection, installation or fixation, or indirect connection, installation or fixation. This utility model does not limit this.
[0020] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the structure or unit referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0021] like Figures 1 to 2The diagram illustrates one embodiment of a solar cell module according to this invention. It includes multiple solar cells 1 and metal interconnects 3. The solar cells 1 are arranged sequentially, and the metal interconnects 3 are positioned between adjacent solar cells 1 and contact and engage with corresponding solar cells 1 in series. This invention eliminates the need for high-temperature operation during the series fabrication of multiple solar cells 1, ensuring the quality of the solar cells 1, preventing deformation or failure of the solar cell module, and guaranteeing photoelectric conversion performance.
[0022] In this embodiment, a substrate 2 and a fixing plate 4 are also included. Multiple battery cells 1 are disposed on the substrate 2, and the fixing plate 4 is bonded to the substrate 2 to press against the surface of the metal interconnect sheet 3. In this embodiment, the fixing plate 4 is bonded to the substrate 2 or the battery cell 1 using adhesive 5. The fixing plate 4 is pressed onto two adjacent battery cells 1 and the metal interconnect sheet 3, ensuring effective contact and fit between the metal interconnect sheet 3 and the battery cells 1 on both sides. High-temperature contact is not required, avoiding performance issues caused by heat affecting the battery cells 1. Simultaneously, it ensures the series connection effect of several battery cells 1, resulting in a simple structure, eliminating the need for complex equipment, and reducing manufacturing costs.
[0023] In this embodiment, each battery cell 1 has a first surface and a second surface along its thickness direction. The first surface faces away from the substrate 2 and has grid lines. One end of each metal interconnect 3 contacts the second surface of the corresponding battery cell 1 and is disposed between the second surface and the substrate 2. The other end contacts the grid lines of another battery cell 1. In this embodiment, the grid lines disposed on the first surface include a main grid, on which a solder block is provided. The metal interconnect 3 contacts and cooperates with the solder block and is pressed and fixed by a fixing piece 4. In this embodiment, the length of each metal interconnect 3 along the first direction is not greater than the length of the solder block along the first direction. The first direction is perpendicular to both the arrangement direction of the battery cells 1 and the length direction of the metal interconnect 3, that is, the length direction of the metal interconnect 3 is parallel to the arrangement direction of adjacent battery cells 1. Therefore, the metal interconnect 3 can reduce the shading of the grid lines by the grid lines to ensure the performance of the battery cells 1. Each solder block can be partially or completely covered by the metal interconnect 3 to meet the series connection effect.
[0024] In this embodiment, the fixing plate 4 is a transparent insulating film, and there are multiple fixing plates 4, with one fixing plate 4 placed between each adjacent battery cell 1. The fixing plate 4 can not only ensure the contact and fit between the metal interconnect plate 3 and the battery cell 1, but also reduce the shading of the grid lines to ensure photoelectric conversion performance.
[0025] In this embodiment, the length of the fixing piece 4 along the first direction is not less than the length of the battery cell 1 along the first direction, and the length of the fixing piece 4 along the first direction is not greater than the length of the substrate 2 along the first direction. The first direction is perpendicular to the arrangement direction of adjacent battery cells 1 and parallel to the length direction of the fixing piece 4. In this embodiment, the fixing piece 4 is bonded to the substrate 2 by adhesive 5. In this embodiment, the length of the fixing piece 4 along the second direction is not less than the length of the solder block along the second direction. The second direction is perpendicular to the first direction and parallel to the width direction of the fixing piece 4. In this embodiment, the fixing piece 4 can simultaneously cover two adjacent battery cells 1 and the metal interconnect piece 3, ensuring the contact and fit effect between the metal interconnect piece 3 and the battery cell 1. In this embodiment, the width of the fixing piece 4 is 2-5 mm.
[0026] In this embodiment, the metal interconnect 3 is connected to the battery cell 1 without welding. The fabrication process does not require high temperatures, which ensures the performance of the battery cell 1 and improves the performance of the battery cell assembly after series connection.
[0027] In this embodiment, the metal interconnect sheet 3 is a conductive sheet made of metal. It can be made of metals such as gold, aluminum, and silver as required. In this embodiment, aluminum foil or silver foil is preferred for the metal interconnect sheet 3, which can ensure the connection effect and also ensure the manufacturing cost.
[0028] In different embodiments, the thickness of the metal interconnect sheet 3 and / or the substrate 2 is no greater than 100 micrometers. In this embodiment, the thickness of both the metal interconnect sheet 3 and the substrate 2 is no greater than 100 micrometers. The metal interconnect sheet 3 has a rectangular structure with a length of 5-15 millimeters.
[0029] In this embodiment, the areal density of cell 1 is between 180 g / m². 2 Up to 280g / m 2 Among these, preference is given to those with a surface density of less than 220 g / m³. 2 The solar cell 1 exhibits a photoelectric conversion efficiency greater than 30% under AM0 spectral conditions, preferably greater than 32%. The substrate 2 is a polymer film material, which may include PET, PVC, PE film, etc., and its areal density is less than 100 g / m². 2 The transmittance of fixed plate 4 at a wavelength of 600 nm is greater than 90%.
[0030] The specific preparation process in this embodiment is as follows:
[0031] Place the substrate 2 on a table or other flat surface, ensuring that the surface is free of wrinkles, particles, etc. In this embodiment, the substrate 2 is an 80-micron-thick PVC film.
[0032] The battery cells 1 are arranged sequentially on the substrate 2. In this embodiment, the battery cells 1 have an average areal density of 216 g / m³. 2 Reverse triple-junction flexible thin-film solar cell;
[0033] Each metal interconnect 3 has its two ends placed under the corresponding solder joint or the second surface. In this embodiment, the metal interconnect 3 is a 0.5mm×1.0mm×0.05mm silver bar.
[0034] The fixing piece 4 is connected to the substrate 2 by the adhesive 5. The fixing piece 4 is pressed on the gap between adjacent battery cells 1 so that the second surface of the corresponding battery cell 1 is in close contact with the metal interconnect piece 3 and the solder joint of the metal interconnect piece 3 and another battery cell 1 to realize the series connection of multiple battery cells 1. In this embodiment, the fixing piece 4 is an EFTE fixing strip of 45mm×0.8mm×0.05mm.
[0035] This embodiment can improve the power-to-weight ratio, thereby improving the photoelectric conversion capability of the solar cell module. This embodiment was tested under AM0 spectrum and the power-to-weight ratio can reach 1200W / kg, which has a better performance compared with the traditional power-to-weight ratio of 600W / kg.
[0036] This invention eliminates the need for high-temperature processes, thus avoiding the impact of heat generated during welding or lamination on the performance of the solar cell 1, preventing the solar cell 1 from curling due to heat, and reducing the risk of deformation and failure of the solar cell module; the manufacturing process is simple, requiring no complex equipment, and ensuring manufacturing cost; it has a high specific power and can be widely applied.
[0037] The embodiments of this utility model have been described in detail above, but the content described is only a preferred embodiment of this utility model and should not be considered as limiting the scope of implementation of this utility model. All equivalent changes and improvements made in accordance with the claims of this utility model should still fall within the patent coverage of this utility model.
Claims
1. A solar cell module, characterized by, The battery cell module comprises a plurality of battery cells and metal interconnection sheets, the battery cells are arranged in sequence, and the metal interconnection sheets are arranged between adjacent battery cells and contact the corresponding battery cells to be connected in series.
2. The solar cell module according to claim 1, characterized by: The battery cell module further comprises a substrate and fixing sheets, the battery cells are arranged on the substrate, and the fixing sheets are bonded to the substrate to be placed on the surface of the metal interconnection sheets.
3. The solar cell module according to claim 2, characterized by: Each battery cell has a first surface and a second surface along the thickness direction, the first surface is away from the substrate and has a grid line, one end of each metal interconnection sheet contacts the second surface of the corresponding battery cell, and the other end contacts the grid line of another battery cell.
4. The solar cell module according to claim 2, characterized by: The number of the fixing sheets is plural, and one fixing sheet is arranged between each adjacent battery cell.
5. The solar cell module according to claim 2, characterized by: The length of the fixing sheet along a first direction is not less than the length of the battery cell along the first direction, the length of the fixing sheet along the first direction is not greater than the length of the substrate along the first direction, and the first direction is perpendicular to the arrangement direction of the adjacent battery cells.
6. The solar cell module according to any one of claims 1 to 5, characterized by: The metal interconnection sheet is not welded to the battery cell.
7. The solar cell module according to claim 2, characterized by: The metal interconnection sheet is an aluminum foil or a silver foil, and the thickness of the metal interconnection sheet and / or the substrate is not greater than 100 microns.