CN-121985595-A - Flexible bus bar, manufacturing method thereof and photovoltaic module

Abstract

The invention provides a flexible bus bar, a manufacturing method thereof and a photovoltaic module, relates to the technical field of photovoltaics, and aims to solve the problems that an existing metal bus bar is low in connection strength and easy to damage. The flexible bus bar provided by the invention has the advantages that the substrate and the conductive layer are made of light-transmitting materials, so that concealing treatment is not needed as in the conventional technology. In addition, the flexible bus bar can be well deformed and can be applied to photovoltaic modules with various shapes and sizes, so that the flexibility and the diversity of application are improved. Secondly, the stability is higher by means of screen printing than by means of conventional gluing.

Inventors

• WANG ZHENG
• YU HUAJUN
• SUN ZHONGWEI

Assignees

• 深圳市华宝新能源股份有限公司

Dates

Publication Date

20260505

Application Date

20241028

Claims (12)

1. 1. A flexible bus bar, comprising: a light-transmitting insulating substrate; and the light-transmitting conductive layer is printed on the light-transmitting insulating substrate in a screen printing mode.
2. 2. The flexible bus bar of claim 1, wherein the light transmittance of the flexible bus bar is 80% or greater.
3. 3. The flexible bus bar of claim 1, wherein the light-transmissive conductive layer comprises a non-metallic light-transmissive conductive layer.
4. 4. The flexible bus bar of claim 3 wherein the non-metallic light transmissive conductive layer comprises one or a combination of a carbon nanotube layer, a nanographene layer, a high molecular light transmissive conductive polymer layer.
5. 5. The flexible bus bar of claim 1 wherein the light transmissive insulating matrix comprises one or a combination of an epoxy glass laminate, a mylar, and a polyimide film.
6. 6. The flexible bus bar of claim 1 wherein the flexible bus bar is, The thickness of the transparent conductive layer is 0.1mm or more and 0.3mm or less, and/or The thickness of the transparent insulating matrix is more than or equal to 0.1mm and less than or equal to 0.6mm, and/or The light-transmitting conductive layer includes a silver nanowire conductive layer.
7. 7. A method of making a flexible bus bar, comprising: Hydrophilizing the first side surface of the transparent insulating substrate by using plasma; placing a silk screen stencil on the surface of a first side of the transparent insulating matrix, placing transparent conductive ink on one side of the silk screen stencil far away from the transparent insulating matrix, and coating the transparent conductive ink on the surface of the transparent insulating matrix to form a transparent conductive layer, wherein the transparent insulating matrix has flexibility; and sintering and curing the light-transmitting insulating matrix with the light-transmitting conductive layer to obtain the flexible bus bar.
8. 8. The method according to claim 7, wherein in the step of sintering and curing treatment, a sintering temperature is 60 ℃ or higher and 120 ℃ or lower, and a sintering time is 0.5h or higher and 2h or lower.
9. 9. A photovoltaic module, comprising: a flexible bus bar according to claim 1 to 6, or A flexible bus bar produced by the production method of a flexible bus bar according to claim 7 or 8.
10. 10. The photovoltaic module of claim 9, further comprising: A battery disposed at one side of the flexible bus bar and connected with the light-transmitting conductive layer; a front plate disposed on a side of the flexible bus bar remote from the battery; A back plate arranged on one side of the battery far away from the flexible bus bar; And the front film is arranged on one side of the front plate away from the flexible bus bar.
11. 11. The photovoltaic module of claim 10, further comprising: A first adhesive layer disposed between the front film and the front plate; A second adhesive layer disposed between the front plate and the flexible bus bar; And the third adhesive layer is arranged between the battery and the backboard.
12. 12. The photovoltaic module of claim 10, wherein the photovoltaic module comprises, The front membrane comprises one or a combination of ETFE membrane, PVDF membrane, PVF membrane and POL membrane, and/or The front panel comprises one or a combination of PET, glass fiber and HPC panels, and/or The battery comprises one or a combination of PERC battery, TOPCON battery and IBC battery, and/or The back sheet comprises one or a combination of a PET sheet, a glass fiber sheet, and an HPC sheet.

Description

Flexible bus bar, manufacturing method thereof and photovoltaic module Technical Field The invention relates to the technical field of photovoltaics, in particular to a flexible bus bar, a manufacturing method thereof and a photovoltaic module. Background The conventional metal bus bar is usually colored and has poor light transmittance, is not matched with the whole black color tone of the photovoltaic module, and needs to be subjected to concealing treatment, so that the operation is complex, on the other hand, the bus bar is usually connected with an insulating plate of CPC (Coating II PET II Coating), namely Coating II polyethylene terephthalate (Polyethylene Terephthalate) II Coating) by adopting double-sided adhesive, and the deformation degree of the metal bus bar and the CPC and other high molecular polymers under the action of external force (such as thermal expansion and contraction caused by temperature change, mechanical stress and the like) is also different, so that the phenomenon of separation or wrinkling among materials can be caused. Some documents disclose that bus bars are formed by printing with conductive paste through a screen printing process, but silver paste is generally used as a conductive layer, and after the silver paste is fixed, one side of the bus bars has a certain color, the attractiveness is poor, and on the other hand, the deformability of metallic silver is poor, so that the bus bars are easy to damage under the action of external force and cannot be suitable for different back plates. Disclosure of Invention The invention aims to solve the problems of low connection strength and easy damage of the existing metal bus bars. A first aspect of the present invention is to provide a flexible bus bar. A second aspect of the present invention is to provide a method of manufacturing a flexible bus bar. A third aspect of the present invention is to provide a photovoltaic module. The flexible bus bar provided by the first aspect of the invention comprises a light-transmitting insulating matrix and a light-transmitting conductive layer, wherein the light-transmitting conductive layer is printed on the light-transmitting insulating matrix in a screen printing mode. The flexible bus bar, the substrate and the conductive layer are made of light-transmitting materials, so that concealing treatment is not needed as in the conventional technology. In addition, the flexible bus bar can be well deformed and can be applied to photovoltaic modules with various shapes and sizes, so that the flexibility and the diversity of application are improved. Secondly, the stability is higher by means of screen printing than by means of conventional gluing. In some embodiments, optionally, the light transmittance of the flexible bus bar is 80% or more. In this technical scheme, the flexible busbar has higher luminousness, can eliminate the shielding of traditional metal busbar to battery surface like this, has reduced the loss of light, and holistic aesthetic measure is better, need not additionally hide it and handle. Alternatively, the light transmittance of the flexible bus bar is 90% or more, for example, the light transmittance of the flexible bus bar is 95%. In some aspects, optionally, the light transmissive conductive layer comprises a non-metallic light transmissive conductive layer. In this technical scheme, nonmetal printing opacity conducting layer possesses better deformation for the metal to can make the busbar possess fine flexibility, thereby can use on the photovoltaic module of various shapes and sizes, the suitability is wider. In some embodiments, the non-metallic light-transmitting conductive layer may optionally include one or a combination of carbon nanotube layers, nanographene layers, and high molecular light-transmitting conductive polymer layers. In the technical scheme, the carbon nano tube layer, the nano graphene layer and the macromolecule transparent conductive polymer layer all have good light transmittance and conductivity, so that the light transmittance and the conductivity are improved. In some embodiments, the optically transmissive insulating matrix optionally includes one or a combination of an epoxy glass laminate, a polyester film, and a polyimide film. In the technical scheme, the epoxy glass laminated board, the polyester film and the polyimide film have good light transmittance and damage resistance, are good in flexibility, and can be well deformed, so that the epoxy glass laminated board, the polyester film and the polyimide film can be applied to photovoltaic modules with various shapes and sizes, and the flexibility and the diversity of application are improved. In some embodiments, optionally, the thickness of the light-transmitting conductive layer is 0.1mm or more and 0.3mm or less. Optionally, the thickness of the light-transmitting conductive layer is equal to 0.2mm. In some embodiments, optionally, the thickness of the light-transmitting insulating