CN103078011A

CN103078011A - Method for treating polycrystalline silicon 156 unfilled corner chips

Info

Publication number: CN103078011A
Application number: CN2013100419877A
Authority: CN
Inventors: 杨雷; 梁兴芳; 张长江
Original assignee: Realforce Power Co Ltd
Current assignee: Realforce Power Co Ltd
Priority date: 2013-02-02
Filing date: 2013-02-02
Publication date: 2013-05-01
Anticipated expiration: 2033-02-02
Also published as: CN103078011B

Abstract

The invention discloses a brand-new method for treating polycrystalline 156 unfilled corner chips. The brand-new method comprises the following main steps of: cutting unfilled corner parts into external dimensions of monocrystal 156 by utilizing laser cutting equipment; processing batteries and assemblies by using a method which is the same as conventional methods after printing is performed through a new designed electrode and electric field scheme to obtain final assembly products, wherein the final assembly products are the same as a monocrystalline 156 product in appearance, and can be put into construction of a system power plant to be fully utilized, and therefore, the original phenomenon that a part of the unfilled corner chips are directly discarded or are bought back as fragments by a polycrystalline silicon manufacturer to perform ingot recasting and slicing and a part of the unfilled corner chips are sold at a low price to a developer of manufacturing mini-type generating equipment, such as lawn lamps, garden lamps and the like, is avoided, so that the waste and the cost of factories are reduced, and the input-output ratio of enterprises is increased.

Description

A kind of processing method of 156 polysilicon unfilled corner sheets

Technical field

This patent belongs to solar power plant and makes the field, and a kind of new method that is specifically related to the unfilled corner sheet subsequent treatment utilization that produces in the 156 polycrystalline silicon battery plate preparation process makes it to possess higher utilance and reduces the input-output ratio that unnecessary loss improves company.

Background technology

At present conventional batteries production procedure is: surface structuration is processed, (Texturing) → the phosphorus doping diffusion, (Diffusion) → the PN edge isolation, (Edge Etch) → dephosphorization silex glass, (PSG Removal) → coated with antireflection film, (PECVD) → the silk screen printing backplate, the oven dry of (Screen Printing) → backplate, (Hot Air Dryer) → silk screen printing back surface field → back surface field oven dry → front electrode printing → Fast Sintering, (Fast Firing) → test stepping, (Testing﹠amp; Classifying) → quality inspection, shipment assembly workshop.

The unfilled corner sheet major part that produces in the existing polycrystalline silicon battery plate manufacture process is directly scrapped as fragment or is melted down again the casting polycrystalline silicon ingot by the purchase of polycrystalline silicon ingot casting manufacturer and again cuts into slices; Another fraction be sold to terminal applies product development merchant print electrode and lasser cutting after the preparation undersized terminal micro generation equipment such as Lawn lamp, garden lamp, solar mobile phone charging device.

Summary of the invention

The objective of the invention is provides a kind of processing method of 156 polysilicon unfilled corner sheets for overcoming above-mentioned the deficiencies in the prior art, the fairly simple and easy realization of the processing method of 156 polysilicon unfilled corner sheets in this technical scheme.

For achieving the above object, the present invention adopts following technical proposals:

A kind of processing method of 156 polysilicon unfilled corner sheets, key step is to utilize laser cutting device 156 polysilicon unfilled corner sheets to be cut into the external dimensions of monocrystalline 156, after the electrode of process brand-new design and electric field scheme are printed, use the processing processing of carrying out battery and assembly with conventional identical method, final subassembly product possesses identical outward appearance with monocrystalline 156 products, in order to take full advantage of in the construction of enrolling the system power station.

A kind of processing method of 156 polysilicon unfilled corner sheets, concrete steps are as follows:

The first step prepares the 156 polysilicon unfilled corner sheet unifications that produce in the Workshop Production workshop section and treats that the lower step processes to the plated film before the silk screen printing;

Second step is called in the outward appearance that laser cutting machine is processed as all unfilled corner sheets 156 monocrystalline with establishment 156 monocrystalline fillet graphic files;

In the 3rd step, well cutting used fine sandpaper to carry out the corner polishing at goods to avoid more sharp-pointed edge to occur;

In the 4th step, utilize screen printing technique to prepare electrode, the electric field of 156 monocrystalline fillets with what handle well at goods;

In the 5th step, it is ready for next step preparation assembly finished product that the finished product cell piece is tested stepping;

In the 6th step, will prepare assembly and carry out the module testing stepping in order to the use in system power station with shelves cell piece series welding, lamination.

In the described second step, use the laser of 12-12.5A, 13KHz can cut varying sized with the speed of 8-10mm/s.

In described the 3rd step, the order number of fine sandpaper is 800 orders or thinner.

In described the 5th step, change through the area that cuts cell piece, the test stepping is to carry out the correction of area, is 23860 square millimeters of normal steppings that can carry out conversion efficiency with 24336 square millimeters original area correction.

After described the 6th step, with the assembly after the processing be mixed into array, system with 156 monocrystalline silicon assemblies of power output shelves.

Because the change of profile need to redesign back surface field and front electrode half tone figure, backplate can not need to change; Area through the cutting cell piece changes.

The purpose of this patent is that the cutting process by laser cutting machine is prepared into the fillet apparent size specification of 156 monocrystalline with it in advance, then carrying out production and processing is the finished product cell piece, finally is laminated to the photoelectric subassembly that possesses same apparent size specification with 156 monocrystalline and enrolls in the assembling in system power station.

Idiographic flow is: surface structuration is processed, (Texturing) → the phosphorus doping diffusion, (Diffusion) → the PN edge isolation, (Edge Etch) → dephosphorization silex glass, (PSG Removal) → coated with antireflection film, (PECVD) → unfilled corner sheet that the above-mentioned operation of laser cutting produces, (Laser Sawing) → silk screen printing backplate, the oven dry of (Screen Printing) → backplate, (Hot Air Dryer) → silk screen printing back surface field → back surface field oven dry → front electrode printing → Fast Sintering, (Fast Firing) → test stepping, (Testing﹠amp; Classifying) → and quality inspection → components welding → lay → lamination → stepping that frames up → test → cleaning packing ... → system installs.

Use this scheme can make ratio 156 polycrystalline unfilled corner sheets greatly only be increased that the preparation cell piece replaces fragment recovery originally or undersells processing with assembly under the prerequisite of one section manufacturing procedure, reduced the loss of manufacturing material cost; Normal 156 polysilicon chips that the battery for preparing under this scheme, assembly are compared equivalent material only lose that 1.96% area namely only reduces by 1.96% power stage and the component package loss is controlled at 2% ~ 3% equally, and the 156 single-wafer angle squares that use on outward appearance and the market are very little identical.Polycrystalline is made reprocessing behind the finished product because the factors such as electrode pattern and edge current leakage are infeasible, therefore in making process with regard to the cutting processing profile, the modification electrode pattern.

Processing method of the present invention has been avoided originally a unfilled corner sheet part directly being scrapped or has been done fragment and bought back to production of polysilicon merchant again ingot casting and cut into slices, a part is undersold to the developer who does the micro generation equipment such as Lawn lamp, garden lamp, reduce waste and the cost of factory, increased the input-output ratio of enterprise.

Description of drawings

Fig. 1 a. is the size diagram of 156-220 before the laser cutting, length of side 156mm, diagonal line length 220mm;

Fig. 1 b. is the size diagram of 156-200 after the laser cutting, length of side 156mm, diagonal line length 200mm;

Fig. 2. be back surface field half tone drawing: back of the body electric field half tone is identical with monocrystalline 156 half tone external dimensions, just because the different therefore medial section hollow out figures of back electrode are not equal to monocrystalline;

Fig. 3. be the front electrode figure: positive electrode figure and conventional polycrystalline 156-220 are similar, and just four circular arc figures that diameter is 197mm are pruned out in four corners, and external edge is identical with monocrystalline 156-200 along size;

Fig. 4 a is the rich large test machine power test I-V curve chart of conventional polycrystalline 156-220 assembly;

Fig. 4 b is the rich large test machine power test I-V curve chart of cutting polycrystalline 156-200 assembly.

Embodiment

Embodiment:

1, according to the above embodiment first step, second step RFXZXX121120010 in the company batch of polycrystalline 156-220 treated that it is 156-200 apparent size shown in Figure 1 that goods use laser cutting, and carry out the cut place polishing with 800 order sand paper and avoid more sharp-pointed edge in following process, to cut half tone, to be further processed; Wherein the laser machine parameter is set to:

Table 1. laser machine parameter arranges

Major parameter	Frequency (Hz)	Electric current (A)	Cutting speed (mm/s)
				Set numerical value	13,000	12.5	8

Wherein 156 polysilicon areas before the processing are 24336 square millimeters, after the processing 156 single-wafer edged surfaces long-pending be 23860 square millimeters.

2, will treat after the above-mentioned cutting polishing that goods and contrast crowd 156-220 use Italian Baccini printing machine to carry out that the silk screen method prints electrode, electric field, printing parameter is as follows:

Table 2. silk-screen printing technique parameter

Silk screen spacing (um)	The scraper degree of depth (um)	Squeegee pressure (N)	Print speed printing speed (mm/s)	Feed back speed (mm/s)
					~1700	~1600	82	220	500

Table 3. battery electrode, electric field weight parameter

Supplementary product onsumption	156-200	156-220
			Backplate (g)	0.022	0.023
Back surface field (g)	1.33	1.35
			Front electrode (g)	0.101	0.11

3, use the BerGer test machine to carry out the test stepping of cell piece, test result is as follows:

Table 4. cell piece performance parameter

Split	Qty.	Voc	Isc	Rsh	Rs	FF	Irev1	Irev2	Ncell	Pmpp
											156-220	551	0.6220	8.440	180	0.00254	78.42	0.054	0.165	16.92%	4.117
156-200	552	0.6219	8.325	201	0.00312	76.98	0.043	0.126	16.87%	4.036

4, identical gear cutting cell piece and conventional 156 polycrystalline cell pieces carry out assembly processing and test comparison

4.1 the 1.8mm wide welding band welds and is communicated with processing 60pcs battery component model in the use company;

4.2, use conventional PE backboard, two fluorine EVA and non-coated toughened glass to carry out component lamination processing;

4.3 two of tests contrast the parameters such as assembly power stage under the external environment conditions such as same illumination;

Table 5. module testing unit for electrical property parameters

Serial

Eff

Rsh

Rs

FF

Isc

Voc

Imax

Vmax

Pmax

Temp

Irev

Class

156-220

14.74%

74.7

0.584

73.40%

8.794

37.164

8.295

28.916

239.9

25

5.813

235w

Theoretical power (horse-power)

?

245.3

?

Power loss

?

2.22%

?

156-200

14.36%

50.0

0.626

72.23%

8.648

37.407

8.052

29.018

233.7

25

5.618

230W

Theoretical power (horse-power)

?

240.5

?

Power loss

?

2.85%

?

△

0.38%

24.8

~0.042

1.17%

0.145

~0.243

0.243

~0.102

6.2

?

0.195

?

Such as Fig. 4 a, shown in Fig. 4 b, this patent takes aforesaid way to carry out the cutting recycling of unfilled corner sheet, the final module testing result of same transitions efficient gear (16.8%) differs an only gear (5W/ shelves), theoretical power output differs 1.96%, the 156-200 power output should be 239.9*98.04%=235.1704W under the prerequisite of equal-wattage loss, so but in fact 233.7W＜235.2W be since the series resistance Rs of 156-200 cell piece own a little more than the power loss 2.85% of conventional 156-220 battery assembly 2.22% cause, can say fully by the optimization of production technology that power loss that this part increases balances out and reach theoretical power output that the integrated testability curve is basic identical to there is no larger difference so assembly without quality problems.

Claims

1. the processing method of a polysilicon unfilled corner sheet, it is characterized in that, key step is to utilize laser cutting device 156 polysilicon unfilled corner sheets to be cut into the external dimensions of monocrystalline 156, after the electrode of process brand-new design and electric field scheme are printed, use the processing processing of carrying out battery and assembly with conventional identical method, final subassembly product possesses identical outward appearance with monocrystalline 156 products, in order to take full advantage of in the construction of enrolling the system power station.

2. processing method according to claim 1 is characterized in that, concrete steps are as follows:

3. processing method according to claim 2 is characterized in that, in the described second step, uses the laser of 12 ~ 12.4A, 13KHz can cut varying sized with the speed of 8 ~ 10mm/s.

4. processing method according to claim 2 is characterized in that, in described the 3rd step, the order number of fine sandpaper is 800 orders or thinner.

5. processing method according to claim 2 is characterized in that, in described the 5th step, should correction area be 23860 square millimeters of 156 monocrystalline silicon areas before the test.