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Fabrication method of slice cell, slice cell and photovoltaic module

A battery and slicing technology, applied in the field of solar energy utilization, can solve the problems of slicing battery efficiency loss, efficiency loss restricting the development of photovoltaic module technology, photovoltaic module power loss, etc., to achieve the effect of improving photoelectric efficiency

Inactive Publication Date: 2019-07-30
TAIZHOU LERRISOLAR TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, with the in-depth research on laser slicing, it was found that although the problem of power loss of photovoltaic modules was solved, the problem of efficiency loss of sliced ​​cells was introduced.
Large slice cell efficiency loss limits the development of photovoltaic module technology

Method used

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  • Fabrication method of slice cell, slice cell and photovoltaic module
  • Fabrication method of slice cell, slice cell and photovoltaic module
  • Fabrication method of slice cell, slice cell and photovoltaic module

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preparation example Construction

[0026] In order to solve the technical problem of efficiency loss of sliced ​​batteries, the present invention provides a preparation method of sliced ​​batteries, sliced ​​batteries and photovoltaic modules.

[0027] In the first embodiment provided by the present invention, the method for preparing a sliced ​​battery includes the following steps:

[0028] S101. After scribing and splitting the whole battery by laser, a plurality of independent sub-cells are obtained, and the sub-cells have at least one fracture surface.

[0029] The entire battery is scribed at the preset position by laser to obtain a groove-shaped scribe. At this time, only the scribe is formed on the surface of the entire battery, and the entire battery is not separated from the groove-shaped scribe position. Open to form multiple independent sub-cells; the groove-shaped slits provide guidance for subsequent slivers, that is, when mechanical slitting is used, the entire battery will be split along the slit...

Embodiment 1

[0061] S101. Take a whole piece of HIT battery, and the whole piece of HIT battery has a transparent conductive oxide layer on it. The entire HIT battery is sliced ​​by laser at a preset position, wherein the preset position is between the two main grid lines and parallel to the main grid lines; After processing, a HIT cell with 5 busbar half-cut patterns is formed.

[0062] S102. Stack and place the 5 busbar half-cut graphic HIT cells in sequence on the hollow tray 11 (for details, refer to figure 1 ), push into the annealing station, under the static air environment, turn on the heater 13 and the infrared heating lamp tube 14 in the heat insulation frame 12, and heat the HIT battery sheet of the 5 busbar half-sheet pattern, and the heating time is 30 minutes, 5 The temperature on the surface of the busbar half pattern HIT cell is controlled at 200 degrees Celsius.

[0063] S103. After the heating time is over, push out the tray 11 carrying the HIT cells with 5 busbar half-...

Embodiment 2

[0066] S101. Scribing the entire PERC battery sheet at a preset position with a laser. The preset position is between two busbars and parallel to the busbars; After the slitting process, the independent 5-busbar half-cut pattern PERC cells are formed;

[0067] S102. Stack and place PERC cells with 5 busbar half-cut patterns on the hollowed-out tray 11 (for details, refer to figure 1 ), push into the annealing station, and under the static air environment, turn on the heater 13 and the infrared heating lamp tube 14 in the heat insulation frame 12, and heat the PERC cells with 5 main grid half-sheet patterns, and the heating time is 30 minutes, 5 The temperature on the surface of the busbar half pattern PERC cell is controlled at 200 degrees Celsius.

[0068] S103 , after the heating time is over, push out the tray 11 carrying the PERC cells with 5 busbar half-cut patterns from the annealing station and cool down to room temperature.

[0069] The obtained sliced ​​battery is d...

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Abstract

The invention provides a fabrication method of a slice cell. The fabrication method comprises the steps of obtaining a plurality of independent sub-cell pieces after laser scribing and cracking on thewhole cell, wherein each sub-cell piece is provided with at least one crack surface; and performing thermal oxidization on the crack surface, wherein the crack surface comprises the step of processing the sub-cell pieces for 20-60 minutes at 180-230 DEG C under an oxygen-containing atmosphere. After the whole cell is cracked, thermal oxidization is performed on the crack surfaces of the independent sub-cell pieces, the recombination of photo-generated carriers generated at the crack surfaces due to photoelectric effect can be prevented by silicon dioxide protection films formed on the crack surfaces, and the photoelectric efficiency of the slice cell is further and greatly improved. The invention also provides the slice cell fabricated by the method of the slice cell and a photovoltaic module comprising the slice cell.

Description

technical field [0001] The invention relates to the technical field of solar energy utilization, in particular to a preparation method of a sliced ​​battery, a sliced ​​battery and a photovoltaic module. Background technique [0002] In recent years, photovoltaic technology has developed very rapidly, and the conversion efficiency of industrialized high-efficiency crystalline silicon cells has increased by about 0.5% absolute efficiency per year. With the improvement of the efficiency of crystalline silicon cells, the current density of crystalline silicon cells has also increased, and has exceeded 40.3 mA / cm2. However, as the current density of crystalline silicon cells rises sharply, the current of the entire cell also increases significantly, resulting in high power loss in the traditional way of photovoltaic modules formed by electrical interconnection of entire cells. [0003] With the rapid development of laser technology, laser slicing has become a very economical so...

Claims

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Application Information

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IPC IPC(8): H01L31/0216H01L31/042H01L31/18
CPCH01L31/02167H01L31/042H01L31/1804Y02E10/547Y02P70/50
Inventor 王建波朱琛吕俊张琦忠
Owner TAIZHOU LERRISOLAR TECH CO LTD
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