Solar cell piece and precision determining method

A technology for solar cells and cells, applied in circuits, photovoltaic power generation, electrical components, etc., can solve problems such as abnormality that cannot be found in time, poor matching between wire grooves and aluminum grid lines, and poor batch performance.

Pending Publication Date: 2019-10-15
YANCHENG CANADIAN SOLAR INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main technical point of the double-sided PERC cell is that the wire slots on the back side are required to coincide with the aluminum grid lines. The occurrence of offset exceptions will cause poor batch performance
At present, the method of monitoring deviation in the production line is mainly to spot-check the EL (Electro Luminescence, electroluminescence) detection of the finished cells after sintering and blanking. Rate and cell efficiency affect the production capacity on duty

Method used

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  • Solar cell piece and precision determining method
  • Solar cell piece and precision determining method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] This embodiment provides a solar battery sheet, and the solar battery sheet may be a double-sided PERC battery. Such as figure 1 and figure 2 As shown, the solar cell includes a cell body 1 and a plurality of aluminum grid lines 3 and bus bars 4 arranged on the back of the cell body 1 , the aluminum grid lines 3 and the bus bar 4 are perpendicular to each other. The cell body 1 includes a silicon nitride film on the back, an aluminum oxide film, a P-type silicon, an N-type emitter and a silicon nitride film on the front side stacked in sequence from bottom to top. In order to connect the aluminum grid line 3 to the P-type silicon so as to form an ohmic contact so as to achieve the purpose of collecting electrons, a slot structure is also arranged on the back of the cell body 1, and the slot structure is arranged on the silicon nitride film on the back , and penetrate the silicon nitride film and the aluminum oxide film on the back side, so as to expose the P-type sil...

Embodiment 2

[0049] This embodiment provides a method for judging the accuracy of a solar cell, which can be used for the solar cell in Embodiment 1.

[0050] Specifically, the length of the correction wire slot 21 is greater than the length of the aluminum grid line 3, after printing the aluminum grid line 3, by observing whether the unshielded end of the calibration wire slot 21 and the corresponding aluminum grid line 3 are on the same straight line, it can be Judging the overlap between the aluminum grid line 3 and the wire slot.

[0051] In this embodiment, the coincidence of the aluminum grid wire 3 and the wire groove can be judged by visual observation, which is convenient and simple, and does not require other auxiliary equipment. Abnormalities can be detected in time to avoid poor batch performance of products.

Embodiment 3

[0053] The positional deviation between the aluminum grid wire 3 and the wire groove generally has two factors, one is the processing accuracy of the wire groove, and the other is the printing accuracy of the printing screen. When it is judged that there is a deviation between the position of the aluminum grid line 3 and the limit position through the accuracy judgment method in Example 2, in order to conveniently and accurately adjust the production line equipment and precision, so as to ensure the yield rate of the battery sheet, it is necessary to judge the aluminum grid line 3 Influencing factors of the positional deviation from the limit.

[0054] The accuracy judging method provided in this embodiment can judge whether there is an accuracy error in the slotted structure, so as to quickly determine the cause of the abnormality of the production line.

[0055] Specifically, on the basis of the solar cells provided in Embodiment 1, respectively detect the arrangement direct...

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Abstract

The invention discloses a solar cell piece and a precision determining method. The solar cell piece comprises a cell piece body and a slotted structure disposed on the cell piece body. The slotted structure comprises a plurality of parallel line slots, at least one of which is a correction line slot and the remaining line slots of which are standard line slots, wherein the length of the correctionline slot is greater than the length of the standard line slots. In the solar cell piece, at least one end of the correction line slot can be prevented from being blocked, so that it can be visuallydetermined by naked eyes whether the line slot overlaps an aluminum grid line and an anomaly can be found in time. The precision determining method determines whether the unblocked end of the line slot and the corresponding aluminum grid line are on the same straight line by visual observation in order to determine whether the line slot overlaps the aluminum grid line. The precision determining method is simple, and can determine the precision anomaly in time in order to timely stop loss. The method can also determine the positional precision of the slotted structure by detecting the distancebetween the correction line slot and the edge of the cell piece body.

Description

technical field [0001] The invention relates to the field of photovoltaic technology, in particular to a solar cell and a method for judging its accuracy. Background technique [0002] At present, polycrystalline double-sided PERC cells (Passivated Emitter and Rear Cell) have become the mainstream of the entire solar cell field. Due to their high photoelectric conversion efficiency and double-sided absorption of sunlight, they have higher power generation and have greater use in practical applications. value. [0003] A double-sided PERC cell includes a back electrode, a back silicon nitride film, an aluminum oxide film, a P-type silicon, an N-type emitter, a front silicon nitride film, and a front silver electrode arranged sequentially from bottom to top. The back electrode is mainly composed of vertically intersecting back electrode main grid lines and back electrode sub-gate lines. The back electrode sub-gate lines are usually screen-printed aluminum grid lines, which ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/0236H01L31/0224H01L21/66
CPCH01L22/20H01L31/022433H01L31/0236Y02E10/50
Inventor 伏进文朱兰兰袁中存
Owner YANCHENG CANADIAN SOLAR INC
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