Transparent flexible conductive core board for back-contact large-size battery assembly and preparation method thereof

A technology of battery components and flexible conduction, applied in electrical components, circuits, photovoltaic power generation, etc., can solve problems such as the difficulty in applying back-contact large-size solar cell components, the inability to develop double-sided back-contact cell components, large flexible transparent conductive films, etc. , achieving high stability and UV absorption coefficient, achieving flexibility and transparency, and rich raw materials

Inactive Publication Date: 2019-11-19
JIANGSU SUNPORT POWER CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the current back contact battery components, the mainstream conductive circuit core board materials are copper foil and copper aluminum foil, which have excellent electrical conductivity but also have high cost, resulting in the back contact battery relying on the metal conductive circuit core board and cannot The development of double-sided back-contact battery modules limits the scope of application
At present, the main production methods of transparent conductive films based on metal oxides are chemical vapor deposition, magnetron sputtering coating, evaporation, etc., which have the disadvantages of complex technology, high energy consumption and low yield.
Moreover, due to technical and cost constraints, it is impossible to prepare large-sized flexible transparent conductive films, and it is difficult to apply to back-contact large-scale solar cell modules.

Method used

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  • Transparent flexible conductive core board for back-contact large-size battery assembly and preparation method thereof
  • Transparent flexible conductive core board for back-contact large-size battery assembly and preparation method thereof
  • Transparent flexible conductive core board for back-contact large-size battery assembly and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] When this embodiment is implemented by spin coating, the polymer film substrate 2 is cleaned first, and then placed on the loading tray of the spin coating machine, and the loading tray is evacuated to prevent the film substrate from slipping during spin coating. Then the sol of certain volume and solid content is dropped on film base 2 (see figure 2 ), the amount of sol 3 can be 90-160ml / m 2 , the solid content of sol 3 can be 0.5%-3.5%. Use the set parameters for spin coating. The coating is divided into low speed gear 300-1000 rpm and high speed gear 2500-5500 rpm. The coating time of high and low speed gear can be 5s-60s, and the low speed gear is used for sol The high-speed gear is used to control the uniformity of film coating. By controlling the coating time of this gear, the thickness of film coating can be controlled within the range of 300-800nm. After spin coating, the films were dried at 50°C and then at 120°C for 6 minutes and then baked for 20 minutes. ...

Embodiment 2

[0027] When this embodiment is implemented by pulling coating, the polymer film substrate is first cleaned, and a mask plate is pasted and fixed on the back. Several polymer film substrates 2 are subsequently immersed in the coating sol 3 simultaneously (see Figure 4 ). Do not touch each other between the substrates, so as not to affect the film coating quality. Control the dipping time and pulling speed to control the thickness of the coating. The dipping time can be 3-15min, the dipping speed can be 50-150mm / s, and the pulling speed can be 10-60mm / s. After coating the pull-up film, the film was dried at 50° C. and 120° C. for 6 minutes and then baked for 20 minutes. Then press a certain pattern (see image 3 ) performing laser etching on the conductive film, and then purging with nitrogen gas and removing the mask plate after etching to obtain a flexible transparent conductive circuit core board. Please add the yellow part parameters.

Embodiment 3

[0029] In this embodiment, when the transparent and flexible conductive film is prepared by spin-coating fluorine-doped tin dioxide sol, the sol is dispersed in ethanol solvent, and the solid content of the sol can be 0.5%-3%. Before coating, the sol needs to be ultrasonically dispersed in ice water. While improving the dispersibility of the sol particles, it is also necessary to avoid a large amount of volatilization of the solvent caused by ultrasonic overheating, which will cause changes in the solid content of the sol and the resulting uneven performance of the conductive film. The temperature of ultrasound is controlled below 10°C, and the time of ultrasound is controlled within 20 minutes.

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Abstract

The invention relates to a transparent flexible conductive core board for a back-contact large-size battery assembly and a preparation method thereof, and belongs to the technical field of photovoltaic equipment. The transparent flexible conductive core board includes transparent conductive oxide adhered on a flexible polymer film substrate. The beneficial effects of the transparent flexible conductive core board are as follows: the transparent flexible conductive core board is richer in raw material, so that assembly cost can be greatly reduced; the transparent flexible conductive core boardcan be used for conventional assemblies, flexible assemblies and double-sided assemblies, so that the application limitation of metal conductive circuit core boards on back-contact batteries can be broken through, and wide application ranges can be achieved; the problems of the oxidation of the metal conductive circuit core boards can be avoided, the maintenance and storage costs of raw materialsand products can be reduced during storage and usage, and the reliability of the assembly can be enhanced; and less pollution to environments can be achieved, and the transparent flexible conductive core board is low in production energy consumption and larger in size, so that using requirements of larger photovoltaic assemblies can be met.

Description

technical field [0001] The invention relates to a transparent and flexible conductive core plate of a back-contact large-size battery assembly and a preparation method thereof, belonging to the technical field of photovoltaic equipment. Background technique [0002] Back contact solar cells and components can obtain higher power and reliability due to their unique structural design. In the current application of module technology, the size of the mainstream back-contact solar cell is 156.75*156.75mm and 158.75*158.75mm. Using P-type silicon single crystal combined with PERC and black silicon texturing technology, the energy conversion efficiency of the cell can reach It can reach 23%, and can guarantee a 30-year power generation life, which can make it have a lower cost per unit of electricity than conventional grid-wire components. But in terms of its power cost, there is still potential for further reduction. The use of cells with a larger size such as 200*200mm can redu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/18H01L31/0224
CPCH01L31/022441H01L31/022466H01L31/1804Y02E10/547Y02P70/50
Inventor 张金银张彩霞吴仕梁路忠林张凤鸣
Owner JIANGSU SUNPORT POWER CORP LTD
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