Solar cell module adopting low-temperature packaging technology
By adopting a low-temperature packaging process in the production of solar cell modules, the electrode point shedding and cell warping caused by high-temperature welding are solved, and higher production yield and product reliability are achieved.
Patent Information
- Application Number
- CN202510085196.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-20
- Publication Date
- 2025-04-18
AI Technical Summary
In the existing solar cell module production process, high-temperature welding causes electrode points to fall off and cell warping, and the prefabricated conductive materials have point deviations due to material shrinkage, which increases production failure rate.
The low-temperature packaging process is adopted to partially cure by heating the laminated structure of the front panel, front packaging, power generation unit, conductive material and conductive tape, so that the power generation unit and the conductive tape are pre-adhesive, and then laminated to avoid high-temperature welding.
It effectively avoids the impact of high-temperature welding on the electrode points of the power generation unit, solves the problems of electrode points falling off and cell warping, greatly improves the production yield, and reduces the thermal stress between the conductive tape and the power generation unit through low-temperature processes, and improves the reliability of the product.
Smart Images
Figure CN119855250A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of solar cells, in particular to a solar cell assembly using a low-temperature packaging process. Background Art
[0002] As the global energy crisis intensifies and environmental pollution becomes increasingly serious, the development and utilization of solar energy as a clean and renewable energy source has attracted more and more attention from the world. As the core component of the solar power system, solar panels are responsible for the important task of efficiently converting solar energy into electrical energy. Their performance and life are directly related to the efficiency and reliability of the entire system.
[0003] In the traditional production process of ribbon-type solar cell modules, the welding of the ribbon usually needs to be performed at a relatively high temperature. However, during the high-temperature welding process, the high temperature environment may cause the electrode points on the battery to fall off, resulting in poor welding. In addition, after the welding is cooled, the battery cell may warp due to the effect of thermal stress, which seriously affects the production yield and the long-term stability of the module.
[0004] In the production process of using conductive backplane as interconnect material, the pre-patterned conductive material is adhered to the adhesive film. During this process, the material may shrink to varying degrees before and after processing and under different room temperature conditions. This shrinkage may cause the position of the pattern to shift, which in turn affects the precise alignment of the cell electrode points and the conductive pattern, increasing the defect rate in the production process. Summary of the invention
[0005] In view of the shortcomings of the prior art, the present invention provides a solar cell module with a low-temperature packaging process, which solves the problems of the prior art such as high welding temperature causing pad detachment and cell warping; and prefabricated patterned conductive materials causing point displacement due to material shrinkage.
[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: A solar cell assembly with a low-temperature packaging process, comprising: A back plate, wherein a back side package is provided on the back plate; A front plate, on which a front package is laid, on which a power generation unit is laid, on which an electrode point of the power generation unit is laid with a conductive tape, and at the connection between the conductive tape and the power generation unit a conductive material is arranged, and the power generation unit forms an effective circuit through the conductive material and the conductive tape; The laminated structure of the front panel, front package, power generation unit, conductive material and conductive tape is heated to achieve partial curing, so that pre-bonding is formed between the power generation unit and the conductive tape, and then the partially cured laminated structure is laminated with the back package and the back panel.
[0007] A method for processing a solar cell assembly using a low-temperature packaging process, the method comprising the following steps: Step 1: Lay the front packaging material on the front plate material; Step 2: multiple positive and negative electrode points are arranged on the power generation unit; Step 3: Use a robot to lay the power generation units in sequence at the designated positions of the front packaging material; Step 4: Use a robot to lay the conductive tape on the electrode points of the power generation unit in sequence, with the conductive material being between the power generation unit and the conductive tape to form effective contact; Step 5: heating the laminated material, so that the conductive material is partially cured after being heated, and the power generation unit and the conductive tape are pre-bonded; Step 6: After laying the back packaging material and backboard material, lamination is performed.
[0008] Preferably, the front plate is made of glass.
[0009] Preferably, the front packaging and back packaging are made of EVA material.
[0010] Preferably, an insulating structure layer is provided on the positive and negative grid lines near the positive and negative electrode points on the power generation unit.
[0011] Preferably, the conductive material is configured as conductive paste.
[0012] Preferably, the conductive paste is arranged between the power generation unit and the conductive tape by dispensing.
[0013] Preferably, infrared heating can be used when heating the laminated material.
[0014] The present invention discloses a solar cell module with a low-temperature packaging process, which has the following beneficial effects: in the solar cell module with the low-temperature packaging process, all processes and working conditions before lamination are carried out at low temperatures, which can effectively avoid the influence of high-temperature welding on the electrode points of the power generation unit, solve the problem of electrode point falling off, and greatly improve the production yield; the conductive tape is placed in a real-time patch manner, and ultra-high-precision mechanical laying equipment can accurately attach the conductive tape to the specified position one by one to ensure processing accuracy; the product as a whole has a two-dimensional packaging structure, and at the same time, through the low-temperature packaging process, there is no thermal stress between the conductive tape and the battery cell of the power generation unit, which further reduces the risk of desoldering and hidden cracks, and the product reliability is better. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0016] Figure 1 It is a schematic cross-sectional view of the product of the present invention; Figure 2 It is a schematic diagram of the conductive tape patch of the present invention; Figure 3 It is a schematic diagram of the stacking position of the power generation unit and the conductive tape patch of the present invention; Figure 4 This is a schematic diagram of the processing flow of Example 1 of the present invention; Figure 5 This is a schematic diagram of the processing flow of Example 2 of the present invention; Figure 6 This is a schematic diagram of the processing flow of Example 3 of the present invention; Figure 7 This is a schematic diagram of the processing flow of Example 4 of the present invention; Figure 8 This is a schematic diagram of the processing flow of Example 5 of the present invention; Fig. 9 This is a schematic diagram of the processing flow of Example 6 of the present invention; Fig.10 This is a schematic diagram of the processing flow of Example 7 of the present invention.
[0017] In the figure: 1. Back panel; 2. Back packaging; 3. Conductive tape; 4. Conductive material; 5. Power generation unit; 6. Front packaging; 7. Front panel. DETAILED DESCRIPTION
[0018] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0019] The embodiment of the present application solves the problems of the prior art that the welding temperature is high, causing the pad to fall off and the cell to warp; the conductive material of the prefabricated pattern causes the point to shift due to the material shrinkage, etc. All processes before lamination are carried out under low temperature (below 150°C), which can effectively avoid the influence of high-temperature welding on the electrode points of the power generation unit 5, solve the problem of electrode point falling off, and greatly improve the production yield; the conductive tape 3 is carried out in a real-time patch manner, and the ultra-high-precision mechanical laying equipment can accurately attach the conductive tape 3 to the specified position one by one to ensure the processing accuracy; the product is a two-dimensional packaging structure as a whole, and through the low-temperature packaging process, there is no thermal stress between the conductive tape 3 and the cell of the power generation unit 5, which further reduces the risk of desoldering and hidden cracks, and the product reliability is better.
[0020] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.
[0021] The embodiment of the invention discloses a solar cell assembly with a low-temperature packaging process.
[0022] According to the attached Figure 1-3 As shown, including: A back plate 1, on which a backside package 2 is arranged; A front plate 7, a front package 6 is laid on the front plate 7, a power generation unit 5 is laid on the front package 6, a conductive tape 3 is laid on the electrode point of the power generation unit 5, and a conductive material 4 is arranged at the connection between the conductive tape 3 and the power generation unit 5, and the power generation unit 5 forms an effective circuit with the conductive tape 3 through the conductive material 4; The laminated structure of the front panel 7, the front package 6, the power generation unit 5, the conductive material 4 and the conductive tape 3 is heated to achieve partial curing, so that pre-bonding is formed between the power generation unit 5 and the conductive tape 3, and then the partially cured laminated structure is laminated with the back package 2 and the back panel 1.
[0023] A method for processing a solar cell assembly using a low-temperature packaging process, the method comprising the following steps: Step 1: Lay the front packaging 6 material on the front plate 7 material; Step 2: Multiple positive and negative electrode points are provided on the power generation unit 5; Step 3: Use a robot to lay the power generation unit 5 in sequence at the designated position of the front packaging 6 material; Step 4: Use a robot to lay the conductive tape 3 on the electrode points of the power generation unit 5 in sequence, with the conductive material 4 being located between the power generation unit 5 and the conductive tape 3 to form effective contact; Step 5: heating the laminated material, so that the conductive material 4 is partially cured after being heated, and the power generation unit 5 and the conductive tape 3 are pre-bonded; Step 6: After laying the back packaging 2 material and the back panel 1 material, lamination is performed.
[0024] Furthermore, the material of the front plate 7 is glass, and a transparent front plate can also be used.
[0025] Furthermore, the materials of the front packaging 6 and the back packaging 2 are EVA materials, and can also be EPE, POE, PVB, and inorganic silica gel materials.
[0026] Furthermore, an insulating structure layer is provided on the positive and negative grid lines near the positive and negative electrode points on the power generation unit 5 .
[0027] Furthermore, the conductive material 4 is configured as conductive paste.
[0028] Furthermore, the conductive paste is arranged between the power generation unit 5 and the conductive tape 3 by dispensing, and the conductive paste can also be arranged by printing.
[0029] Furthermore, the laminated material can be heated by infrared heating or by a heating lamp.
[0030] All processes before lamination are carried out under low temperature working conditions (below 150°C), which can effectively avoid the impact of high-temperature welding on the electrode points of the power generation unit 5, solve the problem of electrode point falling off, and greatly improve the production yield; the conductive tape 3 is carried out in real-time patch mode, and the ultra-high precision mechanical laying equipment can accurately attach the conductive tape 3 to the specified position one by one to ensure processing accuracy; the overall product has a two-dimensional packaging structure, and through the low-temperature packaging process, there is no thermal stress between the conductive tape 3 and the battery cell of the power generation unit 5, which further reduces the risk of desoldering and hidden cracks, and the product reliability is better.
[0031] Example 1 Step 1: lay the front packaging 6 material on the front plate 7 material. The front plate 7 material can be glass or a transparent front plate. The front packaging 6 material can be but is not limited to EVA, EPE, POE, PVB, or an inorganic silica gel material.
[0032] Step 2: Multiple positive and negative electrode points are arranged on the power generation unit 5, and an insulating structure layer is arranged on the positive and negative grid lines. The conductive material 4 is arranged on the battery cell of the power generation unit 5 by dispensing and printing; the conductive material 4 can be but not limited to tin-bismuth alloy paste, polymer conductive paste, silver paste; Step 3: Use a robot to lay the power generation unit 5 in sequence at the designated position of the front packaging 6 material; Step 4: Use a manipulator to lay the conductive tape 3 on the electrode points of the power generation unit 5 in sequence, and the conductive material 4 is between the power generation unit 5 and the conductive tape 3 to form an effective contact. The width of the conductive tape 3 can be 0.5~20mm; the material of the conductive tape 3 can be but not limited to copper, aluminum, silver, gold, nickel, tungsten and other single substances or two or more alloy materials; Step 5: Use infrared or baking lamp to bake the laminated material, and the conductive material 4 is partially cured after being heated, so that the power generation unit 5 and the conductive tape 3 are pre-bonded. The heating temperature does not exceed 150°C. Step 6: After laying the back packaging 2 material and the back panel 1 material, lamination is performed.
[0033] Example 2 Step 1: lay the front packaging 6 material on the front plate 7 material. The front plate 7 material can be glass or a transparent front plate. The front packaging 6 material can be but is not limited to EVA, EPE, POE, PVB, or an inorganic silica gel material.
[0034] Step 2: Multiple positive and negative electrode points are arranged on the power generation unit 5, and an insulating structure layer is arranged on the positive and negative grid lines. Use a robot to lay the power generation unit 5 in sequence to the designated position of the front package 6 Step 3: Arrange the conductive material 4 on the battery cell of the power generation unit 5 by dispensing and printing; the conductive material 4 can be but not limited to tin-bismuth alloy paste, polymer conductive paste, silver paste; the width of the conductive tape 3 can be 0.5-20 mm; the material of the conductive tape 3 can be but not limited to copper, aluminum, silver, gold, nickel, tungsten and other single substances or two or more alloy materials thereof; Step 4: Use a robot to lay the conductive tape 3 on the electrode points of the power generation unit 5 in sequence, and the conductive material 4 is between the power generation unit 5 and the conductive tape 3 to form an effective contact.
[0035] Step 5: Use infrared or baking lamp to bake the laminated material, and the conductive material 4 is partially cured after being heated, so that the power generation unit 5 and the conductive tape 3 are pre-bonded. The heating temperature does not exceed 150°C. Step 6: After laying the back packaging 2 material and the back panel 1 material, lamination is performed.
[0036] Example 3 Step 1: lay the front packaging 6 material on the front plate 7 material. The front plate 7 material can be glass or a transparent front plate. The front packaging 6 material can be but is not limited to EVA, EPE, POE, PVB, or an inorganic silica gel material.
[0037] Step 2: Multiple positive and negative electrode points are arranged on the power generation unit 5, and an insulating structure layer is arranged on the positive and negative grid lines. Use a manipulator to lay the power generation unit 5 in turn to the designated position of the front packaging 6 material; Step 3: Arrange the conductive material 4 on the battery cell of the power generation unit 5 by dispensing or printing; the conductive material 4 can be but not limited to tin-bismuth alloy paste, polymer conductive paste, and silver paste; Step 4: Use a manipulator to lay the conductive tape 3 on the electrode points of the power generation unit 5 in sequence, and the conductive material 4 is between the power generation unit 5 and the conductive tape 3 to form an effective contact. The width of the conductive tape 3 can be 0.5~20mm; the material of the conductive tape 3 can be but not limited to copper, aluminum, silver, gold, nickel, tungsten and other single substances or two or more alloy materials; Step 5: Use infrared or baking lamp to bake the laminated material, and the conductive material 4 is partially cured after being heated, so that the power generation unit 5 and the conductive tape 3 are pre-bonded. The heating temperature does not exceed 150°C. Step 6: After laying the back packaging 2 material and the back panel 1 material, lamination is performed.
[0038] Example 4 Step 1: Lay the back packaging 2 material on the back plate 1 material. The back plate 1 material can be glass or ordinary photovoltaic back plate, and the back packaging 2 can be but not limited to EVA, EPE, POE, PVB, and inorganic silica gel material.
[0039] Step 2: Dispose the conductive material 4 on the conductive tape 3 by dispensing or printing. The conductive material 4 can be, but is not limited to, tin-bismuth alloy paste, polymer conductive paste, or silver paste. The width of the conductive tape 3 can be 0.5-20 mm; the material of the conductive tape 3 can be, but is not limited to, copper, aluminum, silver, gold, nickel, tungsten, or two or more alloys thereof.
[0040] Step 3: Use a robot to lay the conductive tape 3 to the designated position of the back package 2 in sequence; Step 4: Use a robot to lay the power generation unit 5 on the conductive belt 3 in sequence. The power generation unit 5 is provided with a plurality of positive and negative electrode points, and an insulating structure layer is provided on the positive and negative grid lines.
[0041] Step 5: The laminated material is heated by infrared or heating lamps, and the conductive material 4 is partially cured after being heated, so that the power generation unit 5 and the conductive tape 3 are pre-bonded. The heating temperature does not exceed 150°C.
[0042] Step 6: After laying the front packaging 6 material and the front plate 7 material, lamination is performed.
[0043] Example 5 Step 1: Lay the back packaging 2 material on the back plate 1 material. The back plate 1 material can be glass or ordinary photovoltaic back plate, and the back packaging 2 can be but not limited to EVA, EPE, POE, PVB, and inorganic silica gel material.
[0044] Step 2: Use a robot to lay the conductive tape 3 in the designated position of the back package 2 in sequence; the width of the conductive tape 3 can be 0.5~20mm; the material of the conductive tape 3 can be but not limited to copper, aluminum, silver, gold, nickel, tungsten or two or more alloys thereof.
[0045] Step 3: Arrange the conductive material 4 on the conductive tape 3 by dispensing or printing. The conductive material 4 can be, but is not limited to, tin-bismuth alloy paste, polymer conductive paste, or silver paste. The power generation unit 5 is provided with a plurality of positive and negative electrode points, and an insulating structure layer is provided on the positive and negative grid lines; Step 4: Use a robot to lay the power generation units 5 on the conductive belt 3 in sequence; Step 5: The laminated material is heated by infrared or heating lamps, and the conductive material 4 is partially cured after being heated, so that the power generation unit 5 and the conductive tape 3 are pre-bonded. The heating temperature does not exceed 150°C.
[0046] Step 6: After laying the front packaging 6 material and the front plate 7 material, lamination is performed.
[0047] Example 6 Step 1: Lay the back packaging 2 material on the back plate 1 material. The back plate 1 material can be glass or ordinary photovoltaic back plate, and the back packaging 2 can be but not limited to EVA, EPE, POE, PVB, and inorganic silica gel material.
[0048] Step 2: Use a robot to lay the conductive tape 3 in the designated position of the back package 2 in sequence; the width of the conductive tape 3 can be 0.5~20mm; the material of the conductive tape 3 can be but not limited to copper, aluminum, silver, gold, nickel, tungsten or two or more alloys thereof.
[0049] Step 3: Dispose the conductive material 4 on the conductive tape 3 by dispensing or printing. The conductive material 4 can be, but is not limited to, tin-bismuth alloy paste, polymer conductive paste, or silver paste.
[0050] Step 4: Use a manipulator to lay the power generation unit 5 on the conductive belt 3 in sequence; the power generation unit 5 is provided with a plurality of positive and negative electrode points, and an insulating structure layer is provided on the positive and negative grid lines; Step 5: The laminated material is heated by infrared or heating lamps, and the conductive material 4 is partially cured after being heated, so that the power generation unit 5 and the conductive tape 3 are pre-bonded. The heating temperature does not exceed 150°C.
[0051] Step 6: After laying the front packaging 6 material and the front plate 7 material, lamination is performed.
[0052] Example 7 Step 1: Lay the composite material of the back sheet 1 and the back package 2. The back sheet 1 material can be glass or a common photovoltaic back sheet, and the back package 2 can be but not limited to EVA, EPE, POE, PVB, or inorganic silica gel. The two are compounded together.
[0053] Step 2: Use a robot to lay the conductive tape 3 in the designated position of the back package 2 in sequence; the width of the conductive tape 3 can be 0.5~20mm; the material of the conductive tape 3 can be but not limited to copper, aluminum, silver, gold, nickel, tungsten or two or more alloys thereof.
[0054] Step 3: Arrange the conductive material 4 on the conductive tape 3 by dispensing or printing. The conductive material 4 can be, but is not limited to, tin-bismuth alloy paste, polymer conductive paste, or silver paste. The power generation unit 5 is provided with a plurality of positive and negative electrode points, and an insulating structure layer is provided on the positive and negative grid lines; Step 4: Use a robot to lay the power generation units 5 on the conductive tape 3 one by one.
[0055] Step 5: The laminated material is heated by infrared or heating lamps, and the conductive material 4 is partially cured after being heated, so that the power generation unit 5 and the conductive tape 3 are pre-bonded. The heating temperature does not exceed 150°C.
[0056] Step 6: After laying the composite material of the front package 6 and the front plate 7, lamination is performed.
[0057] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.
Claims
1. A solar cell module with a low temperature packaging process, characterized in that: include: A back plate (1), wherein a back side package (2) is provided on the back plate (1); A front plate (7), wherein a front package (6) is laid on the front plate (7), a power generation unit (5) is laid on the front package (6), a conductive tape (3) is laid on an electrode point of the power generation unit (5), a conductive material (4) is arranged at a connection between the conductive tape (3) and the power generation unit (5), and the power generation unit (5) forms an effective circuit through the conductive material (4) and the conductive tape (3); When preparing the above structure, it also specifically involves a processing method of a solar cell assembly using a low-temperature packaging process, and the processing method includes the following steps: Step 1: Lay the front packaging (6) material on the front plate (7) material; Step 2: A plurality of positive and negative electrode points are provided on the power generation unit (5); Step 3: Use a robot to sequentially lay the power generation unit (5) to the designated position of the front packaging (6) material; Step 4: Using a robot, lay the conductive tape (3) on the electrode points of the power generation unit (5) in sequence, with the conductive material (4) being located between the power generation unit (5) and the conductive tape (3) to form effective contact; Step 5: heating the laminated material, so that the conductive material (4) is partially cured after being heated, and the power generation unit (5) and the conductive tape (3) are pre-bonded; Step 6: After laying the back packaging (2) material and the back panel (1) material, lamination is performed.
2. The method for processing a solar cell assembly using a low temperature packaging process according to claim 1, characterized in that: The material of the front plate (7) includes but is not limited to glass, a transparent front plate and a PC plate.
3. The processing method of a solar cell assembly using a low temperature packaging process according to claim 1, characterized in that: The materials used for the front packaging (6) and the back packaging (2) include but are not limited to EVA, EPE, POE, PVB and inorganic silica gel.
4. The method for processing a solar cell assembly using a low temperature packaging process according to claim 1, characterized in that: An insulating structure layer is provided on the positive and negative grid lines near the positive and negative electrode points on the power generation unit (5).
5. The method for processing a solar cell assembly using a low temperature packaging process according to claim 1, characterized in that: The conductive material (4) is configured as conductive paste.
6. The method for processing a solar cell assembly using a low temperature packaging process according to claim 5, characterized in that: The conductive paste can be arranged between the power generation unit (5) and the conductive tape (3) by dispensing, printing and dripping.
7. The method for processing a solar cell assembly using a low temperature packaging process according to claim 1, characterized in that: The laminated material may be heated by infrared heating or baking.
8. The method for processing a solar cell assembly using a low temperature packaging process according to claim 1, characterized in that: The conductive tape (3) is laid on the electrode points of the power generation unit (5) in a real-time patch manner.