阅读说明：本技术 一种抗老化防裂多晶太阳能电池背板 (Anti-aging anti-cracking polycrystalline solar cell back plate ) 是由 石军 于 2020-06-02 设计创作，主要内容包括：本发明属于太阳能光伏电池技术领域,尤其为一种抗老化防裂多晶太阳能电池背板,包括外层耐候保护层、阻隔层、结构增强层和层压粘结层,其中,所述外层耐候保护层与阻隔层之间通过第一粘合层粘结固定,所述阻隔层的内表面设有防裂涂层。本发明在满足太阳能电池背板绝缘性、粘接性以及耐候性能要求的同时,使太阳能电池背板具有良好的水汽阻隔性,大幅度降低了水汽透过率,同时利用炭黑增加胶料的粘度、定伸应力及硬度,通过碳纤维的加入增强了涂层的拉伸、撕裂、剥离强度,使涂层及背板力学性能得到大幅度提高,较之传统的背板结构极大地显著提升了太阳能电池背板的防裂性能,有效延长太阳能电池背板的使用寿命。(The invention belongs to the technical field of solar photovoltaic cells, and particularly relates to an anti-aging and anti-cracking polycrystalline solar cell backboard. The invention meets the requirements of the solar cell backboard on insulativity, adhesiveness and weather resistance, simultaneously ensures that the solar cell backboard has good water vapor barrier property, greatly reduces the water vapor transmittance, simultaneously utilizes the carbon black to increase the viscosity, the stress at definite elongation and the hardness of sizing materials, and enhances the tensile strength, the tearing strength and the peeling strength of the coating by adding the carbon fiber, so that the mechanical properties of the coating and the backboard are greatly improved, compared with the traditional backboard structure, the invention greatly improves the anti-cracking property of the solar cell backboard, and effectively prolongs the service life of the solar cell backboard.)

1. The utility model provides an ageing resistance crack control polycrystal solar cell backplate which characterized in that: including outer resistant protective layer (1), barrier layer (2), structure enhancement layer (3) and lamination tie coat (4), wherein, it is fixed to bond through first bond line (5) between outer resistant protective layer (1) and barrier layer (2), the internal surface of barrier layer (2) is equipped with crack control coating (6), crack control coating (6) are PET/carbon black carbon fiber composite coating, crack control coating (6) are fixed with structure enhancement layer (3) bonding through second bond line (7), structure enhancement layer (3) are fixed with lamination tie coat (4) bonding through third bond line (8).

2. The anti-aging anti-cracking polycrystalline solar cell back sheet according to claim 1, wherein: the outer weather-resistant protective layer (1) is a fluorine material layer, the fluorine material layer is made of one or a combination of multiple of polyvinyl fluoride, polyvinylidene fluoride and vinylidene fluoride-tetrafluoroethylene-hexafluoropropylene copolymer, and the outer weather-resistant protective layer (1) accounts for 8-15% of the thickness of the anti-aging anti-cracking polycrystalline solar cell backboard.

3. The anti-aging anti-cracking polycrystalline solar cell back sheet according to claim 2, wherein: the barrier layer (2) is an aluminum oxide coated layer formed on the substrate through vacuum plating of reactants of aluminum and oxygen, and the barrier layer (2) accounts for 5-10% of the thickness of the anti-aging anti-cracking polycrystalline solar cell backboard.

4. The anti-aging anti-cracking polycrystalline solar cell back sheet according to claim 1, wherein: the structure enhancement layer (3) is a PET film, and the thickness of the structure enhancement layer (3) accounts for 50-60% of that of the anti-aging anti-cracking polycrystalline solar cell backboard.

5. The anti-aging anti-cracking polycrystalline solar cell back sheet according to claim 1, wherein: the laminated bonding layer (4) is a modified fluorine-containing film or a PEVA film or a PE film, and the laminated bonding layer (4) accounts for 5-10% of the thickness of the aged anti-cracking polycrystalline solar cell backboard.

6. The anti-aging anti-cracking polycrystalline solar cell back sheet according to claim 1, wherein: the anti-cracking coating (6) is a composite material coating prepared by melting and mixing polyethylene terephthalate as a base material with carbon black and chopped carbon fibers, and the anti-cracking coating (6) accounts for 5-15% of the thickness of the aging anti-cracking polycrystalline solar cell backboard.

7. The anti-aging anti-cracking polycrystalline solar cell back sheet according to claim 1, wherein: the first bonding layer (5), the second bonding layer (7) and the third bonding layer (8) are made of polyurethane adhesive, acrylic adhesive, polyvinyl acetate adhesive, polyester adhesive or epoxy resin adhesive, and the first bonding layer (5), the second bonding layer (7) and the third bonding layer (8) account for 2-10% of the thickness of the aging anti-cracking polycrystalline solar cell backboard.

Technical Field

The invention relates to the technical field of solar photovoltaic cells, in particular to an anti-aging and anti-cracking polycrystalline solar cell back plate.

Background

Solar energy is the best choice for replacing traditional thermal power generation as an environment-friendly and inexhaustible energy source. Since the solar cell is exposed to the outdoor environment for a long time, the cell in the photovoltaic module must be protected to prevent the influence and damage of the environmental factors such as moisture, oxygen, ultraviolet rays, etc. in the atmosphere. Therefore, a back plate is required to be added at the lower end of the battery piece to protect the battery piece. On this basis, the solar cell back sheet is required to have the following characteristics: firstly, the solar cell back sheet has excellent weather resistance and can resist severe weather; secondly, the solar cell back sheet requires very good ultraviolet absorption capacity, better protection for fixing the silicon wafer and EVA, and in addition, the solar cell back sheet must also have very low water vapor permeability to protect the silicon wafer from moisture and short circuit.

The existing solar cell back plate generally adopts the outer weather-resistant protective layer, the middle layer structure enhancement layer and the inner bonding layer structure, bonding crosslinking is carried out among the components through the bonding layer, the back plate has good weather resistance through the outer weather-resistant protective layer, but the mechanical property of the back plate structure is only supported by the middle layer structure enhancement layer, the middle layer structure enhancement layer generally adopts a polyester film, the polyester film has certain water vapor barrier property, insulativity and strength, but the anti-cracking and anti-cracking properties are poor, the stretching, tearing and peeling strengths are low, the mechanical property strength and the stability are general, the requirement of low water vapor permeability cannot be met, and the service life of the solar cell back plate is influenced.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides an anti-aging anti-cracking polycrystalline solar cell back plate, which solves the problems that the existing solar cell back plate is poor in anti-cracking and anti-cracking performance, low in tensile strength, tearing strength and peeling strength, general in mechanical property strength and stability, incapable of meeting the requirement of low water vapor transmittance and influenced in service life of the solar cell back plate.

(II) technical scheme

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides an ageing resistance crack control polycrystal solar cell backplate, includes outer resistant protective layer of waiting, barrier layer, structure enhancement layer and lamination tie coat, wherein, it is fixed through first bond coat bonding between outer resistant protective layer of waiting and the barrier layer, the internal surface of barrier layer is equipped with the crack control coating, the crack control coating is PET/carbon black/carbon fiber composite coating, the crack control coating passes through the second bond coat and bonds fixedly with the structure enhancement layer, the structure enhancement layer passes through the third bond coat and bonds fixedly with the lamination tie coat.

According to a preferable technical scheme, the outer weather-resistant protective layer is a fluorine material layer, the fluorine material layer is one or a combination of more of polyvinyl fluoride, polyvinylidene fluoride and vinylidene fluoride-tetrafluoroethylene-hexafluoropropylene copolymer, and the outer weather-resistant protective layer accounts for 8-15% of the thickness of the anti-aging anti-cracking polycrystalline solar cell backboard.

According to a preferable technical scheme of the invention, the blocking layer is an aluminum oxide plated layer formed by vacuum plating of reactants of aluminum and oxygen on the base material, and the blocking layer accounts for 5-10% of the thickness of the anti-aging and anti-cracking polycrystalline solar cell backboard.

According to a preferable technical scheme, the structural enhancement layer is a PET (polyethylene terephthalate) film, and accounts for 50-60% of the thickness of the anti-aging and anti-cracking polycrystalline solar cell backboard.

According to a preferable technical scheme, the laminated bonding layer is a modified fluorine-containing film or a PEVA film or a PE film, and accounts for 5-10% of the thickness of the aging anti-cracking polycrystalline solar cell backboard.

According to a preferable technical scheme of the invention, the anti-cracking coating is a composite material coating prepared by melting and mixing polyethylene terephthalate as a base material with carbon black and short carbon fibers, and the anti-cracking coating accounts for 5-15% of the thickness of the aged anti-cracking polycrystalline solar cell backboard.

According to a preferable technical scheme, the first bonding layer, the second bonding layer and the third bonding layer are made of polyurethane adhesive, acrylic adhesive, polyvinyl acetate adhesive, polyester adhesive or epoxy resin adhesive, and account for 2-10% of the thickness of the aged anti-cracking polycrystalline solar cell backboard.

(III) advantageous effects

Compared with the prior art, the invention provides an anti-aging anti-cracking polycrystalline solar cell back plate which has the following beneficial effects:

this ageing resistance crack control polycrystal solar cell backplate, when satisfying solar cell backplate insulating nature, adhesion and weather resistance requirement, composite structure through barrier layer and structure enhancement layer sets up, make solar cell backplate have good steam separation nature, the steam transmissivity has been reduced by a wide margin, simultaneously through add the crack control coating between barrier layer and structure enhancement layer, utilize carbon black to increase the viscosity of sizing material, stress at definite elongation and hardness, the tensile of coating has been strengthened through the addition of carbon fiber, tear, peel strength, make coating and backplate mechanical properties obtain increasing substantially, the crack control performance of solar cell backplate has greatly been shown to compare traditional backplate structure, effectively prolong the life of solar cell backplate.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

In the figure: 1. an outer weather-resistant protective layer; 2. a barrier layer; 3. a structural reinforcement layer; 4. laminating a bonding layer; 5. a first adhesive layer; 6. an anti-cracking coating; 7. a second adhesive layer; 8. and a third adhesive layer.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.