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A method for reducing cracks in the back electrode region of MWT batteries

A back electrode and battery technology, applied in circuits, electrical components, photovoltaic power generation, etc., can solve the problem of rising fragmentation rate at the component end, and achieve the effect of reducing the fragmentation rate, reducing cracks, and reducing the coverage area.

Active Publication Date: 2020-07-31
JIANGSU SUNPORT POWER CORP LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Due to the need for back current collection, the aluminum back field and the positive pole need to overlap to ensure current transmission, and the height of the overlapping area is higher than the height of the positive pole and the aluminum back field. Unreasonable design will easily lead to subsequent battery processes, packaging and transportation, and components. Fragmentation rate rises

Method used

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  • A method for reducing cracks in the back electrode region of MWT batteries
  • A method for reducing cracks in the back electrode region of MWT batteries
  • A method for reducing cracks in the back electrode region of MWT batteries

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Embodiment 1

[0026] The method for reducing the cracks in the electrode area on the back of the MWT battery includes the following steps:

[0027] (1) Silicon wafer: using solar-grade P-type monocrystalline or polycrystalline silicon wafer as the substrate;

[0028] (2) Laser drilling: laser drilling on the silicon wafer, the holes are an N×N array, and the hole shapes are center, square or cone; a better choice, the hole diameter of laser drilling is 100-400μm ;

[0029] (3) Texturing: Use conventional chemical cleaning and texturing methods for texturing to form a light trap surface;

[0030] (4) Diffusion: use POCl3 diffusion source on the suede for high-temperature single-sided diffusion to form a PN junction;

[0031] (5) Mask: On the back surface of the silicon wafer (take the punched hole as the center), prepare a diameter of 1-10mm (for example, 1, 2, 4, 8, 10mm in diameter) and a thickness of 1-50μm (for example, a thickness of 25μm) The round organic mask (such as paraffin film) is prepa...

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Abstract

The invention discloses a method for reducing hidden cracking of a back electrode region of a MWT (Metal Wrap Technology) battery. In the preparation process of a positive electrode region of a back electrode of the MWT battery, hollow-out and antenna designs are adopted for the positive electrode region; the hollow-out design is that a plurality of non-printing regions are arranged in a middle region of a positive pole printing region, and the antenna design is that a plurality of printing regions are arranged in an edge region of the positive pole printing region; in the preparation processof an aluminium back field, a hollow-out design is adopted for a region of the aluminium back field, which is overlapped with the positive electrode region; and the hollow-out design of the aluminiumback field is that a plurality of non-printing regions are arranged in the overlap region of the aluminium back field and the positive electrode region. The hollow-out design of the positive electroderegion can effectively reduce an overall height of the positive electrode region under the condition of ensuring that a welding area of a component is unchanged, and the antenna design can reduce a coverage area of the overlap region under the condition of effectively ensuring current transmission of the positive electrode region and the aluminium back field. The hollow-out design of the overlapregion of the aluminium back field can reduce a height of the overlap region under the condition of ensuring that an area of the overlap region of the aluminium back field and the positive electrode region is unchanged.

Description

Technical field [0001] The invention relates to a method for reducing hidden cracks in the back electrode area of ​​an MWT battery, and belongs to the technical field of MWT solar battery component processing. Background technique [0002] At present, crystalline silicon solar technology includes heterojunction solar cells (HIT), back electrode contact silicon solar cells (IBC), emitter surrounding through silicon solar cells (EWT), laser grooved buried gate cells, and tilted evaporation metal contact silicon solar cells Batteries (OECO) and metal perforated wound silicon solar cells (MWT), among which MWT cells have attracted more and more attention due to their high efficiency, small shading area and better appearance characteristics. [0003] MWT crystalline silicon solar cells use laser drilling to transfer the energy collected on the light-receiving surface through the battery to the electrodes on the back light surface of the battery to reduce the shading area of ​​the light-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L31/0224H01L31/068
CPCH01L31/02245H01L31/068Y02E10/547
Inventor 李质磊吴仕梁路忠林盛雯婷张凤鸣
Owner JIANGSU SUNPORT POWER CORP LTD
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