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Problems solved by technology
The back sheet has the following disadvantages: the thicker back sheet has poor thermal conductivity, poor heat resistance, low light reflectance affects the power generation efficiency of the battery, and low UV resistance has caused premature pulverization of the material on one side of the battery, yellowing, cracking and aging Failure, high water vapor transmission rate causes PID phenomenon, induces lightning streaks (Snail trails) phenomenon reduces power generation efficiency, module repair is difficult, and the backplane is expensive
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Embodiment 1
[0035] like figure 1 Shown is a schematic structural diagram of a solar cell module backsheet 4 with a three-layer structure, including an intermediate layer 3 located in the middle and an outer layer 1 and an inner layer 2 located on both sides of the intermediate layer, which are produced by three-layer co-extrusion one-time continuous production; That is, through high temperature co-extrusion (Co-extrusion) film processing, a polymer mixture film is formed.
[0036] Among them: the raw material of outer layer 1 is PA12 content 88% + TiO 2 The content is 12% (all are mass content, the same below), and the thickness is 0.050mm;
[0037] The chemical formula is [NH-(CH 2 ) 11 -CO] n ; The raw material of inner layer 2 is EVA19%+LLDPE69%+TiO 2 The content is 12%, and the thickness is 0.050mm;
[0038] Chemical formula of inner layer 2: (C 2 H 4 ) x (C 4 H 6 O 2 )+(C 2 H 4 ) n ;
[0039] Among them, EVA chemical formula: (C 2 H 4 ) x (C 4 H 6 O 2 ) y , LLD...
Embodiment 2
[0044] like figure 1 The schematic structural diagram of the solar cell module back sheet 4 of the three-layer structure shown, including the middle layer 3 located in the middle and the outer layer 1 and the inner layer 2 located on both sides of the middle layer,
[0045] Among them, the raw material of outer layer 1 is PA12 content of 88% + TiO 2 The content is 12%, and the thickness is 0.050mm;
[0046] Chemical formula of PA12: [NH-(CH 2 )11 -CO] n ;
[0047] The raw material of inner layer 2 is PA12 content 88%+TiO 2 The content is 12%, and the thickness is 0.050mm;
[0048] The raw material of the intermediate layer 3 has a PA12 content of 98% + TiO 2 The content is 2%, and the thickness is 0.250mm.
[0049] After high temperature co-extrusion (Co-extrusion) film processing, a polymer mixture film is formed.
Embodiment 3
[0051] like figure 1 Shown is a schematic structural diagram of a solar cell module back sheet 4 with a three-layer structure, including an intermediate layer 3 located in the middle and an outer layer 1 and an inner layer 2 located on both sides of the intermediate layer. production.
[0052] Among them, the raw material of outer layer 1 is HDPE-g-GMA content of 65% + PA12 content of 23% + TiO 2 The content is 12%, and the thickness is 0.050mm; among them: HDPE Chemical formula: [-CH 2 -CH 2 -] n ;
[0053] The inner layer 2 selects HDPE-g-GMA content of 65% + PA12 content of 23% + TiO2 content of 12%, with a thickness of 0.050mm;
[0054] Intermediate layer 3 is homopolymer PP content 58% + PP-g-GMA content 20% + PA12 content 20% + TiO 2 2%, the thickness is 0.250mm. After high-temperature co-extrusion (Co-extrusion) film processing, a part of the cross-linking reaction occurs to form a mixed polymer alloy film.
[0055] In the actual manufacturing process, the thre...
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Abstract
The invention discloses a co-extruded one-time formed backplate with a three-layer structure for a solar cell module. The backplate is formed by co-extruding an intermediate layer, outer layers and an inner-layer three-layer film, the intermediate layer is arranged at the middle, and the outer layers are arranged at two sides of the intermediate layer. The backplate has the advantages of high water blocking capability, high reflective rate, high ageing-resistant performance resistant to hydrolysis, ultraviolet and heat for a long time and good recyclable environmental friendliness. In the backplate of the solar cell module, a polymer alloy membrane of the three-layer structure is taken as a core base layer, the outer layer is arranged at the side of an air surface of the three-layer structure and comprises a co-extruded polymer alloy layer, and the inner layer is arranged at a battery side of the three-layer structure and comprises co-extruded polymer alloy. Compared with the prior art, the backplate has the advantages of better water blocking performance, higher reflectivity, higher ageing-resistant performance resistant to hydrolysis, ultraviolet and heat for a long time, better recyclable environmental friendliness and lower cost. Compared with a co-extruded structure of the prior art, the backplate has the advantages of higher heat resistance, higher size stability and higher mechanical breaking strength.
Description
technical field [0001] The invention relates to a three-layer structure co-extrusion type one-time molding solar cell assembly backplane. Background technique [0002] A solar cell module is usually a laminated structure, which mainly includes a glass layer, an EVA encapsulation layer, a silicon cell, an EVA encapsulation layer and a solar cell module backsheet arranged in sequence, wherein the silicon cell is sealed and wrapped by two layers of EVA film. The main function of the solar cell module back sheet is to insulate electrical energy, improve the mechanical strength of the solar cell module, prevent water vapor from penetrating into the sealing layer, and affect the battery life and power generation efficiency. Since the solar cell module back sheet is the outermost part of the solar cell module, the back sheet is required to have good environmental erosion resistance, so the manufactured solar cell module back sheet must have good moisture and heat aging resistance, ...
Claims
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Application Information
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