CN103078011B - A kind of processing method of 156 polysilicon unfilled corner sheets - Google Patents

Abstract

The invention discloses a kind of a kind of completely new approach processing polycrystalline 156 unfilled corner sheet, key step is utilize laser cutting device that unfilled corner part is cut into the external dimensions of monocrystalline 156, after the electrode of brand-new design and electric field scheme print, the method identical with routine is used to carry out the processing process of battery and assembly, final subassembly product possesses identical outward appearance with monocrystalline 156 product, can enroll in the construction in system power station and make full use of, thus avoid and originally directly scrap a unfilled corner sheet part or do fragment and buy back and cut into slices to production of polysilicon business again ingot casting, a part is undersold to doing Lawn lamp, the developer of the micro generation equipment such as garden lamp, reduce waste and the cost of factory, add the input-output ratio of enterprise.

Description

A kind of processing method of 156 polysilicon unfilled corner sheets

Technical field

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

Background technology

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

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

Summary of the invention

The object of the invention is for overcoming above-mentioned the deficiencies in the prior art, providing a kind of processing method of 156 polysilicon unfilled corner sheets, in this technical scheme, the processing method of 156 polysilicon unfilled corner sheets is fairly simple and easily realize.

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 utilize laser cutting device that 156 polysilicon unfilled corner sheets are cut into the external dimensions of monocrystalline 156, after the electrode of brand-new design and electric field scheme print, the method identical with routine is used to carry out the processing process of battery and assembly, final subassembly product possesses identical outward appearance with monocrystalline 156 product, in order to enroll system power station construction in make full use of.

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

The first step, treats lower step process by after unified for the 156 polysilicon unfilled corner sheets produced in Workshop Production workshop section preparation to plated film before silk screen printing;

Second step, calls in the outward appearance that all unfilled corner sheets are processed as 156 monocrystalline by laser cutting machine by establishment 156 monocrystalline fillet graphic file;

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

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

5th step, to prepare assembly finished product ready for next step resultant battery sheet to be carried out test and classify;

6th step, prepares assembly by same shelves cell piece series welding, lamination and carries out the use of module testing stepping in order to system power station.

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

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

In described 5th step, change through the area cutting cell piece, test and classify is the correction needing to carry out area, is 23860 square millimeters of normal steppings that can carry out conversion efficiency by the area correction of original 24336 square millimeters.

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

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

The object of this patent is the fillet apparent size specification being prepared into 156 monocrystalline in advance by the cutting process of laser cutting machine, then carrying out production and processing is resultant battery sheet, is finally laminated to the photoelectric subassembly possessing same apparent size specification with 156 monocrystalline and enrolls in the assembling in system power station.

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

Use this scheme to make to prepare cell piece under greatly ratio 156 polycrystalline unfilled corner sheet is only increased the prerequisite of one section of manufacturing procedure and replace the fragment of script reclaim or undersell process with assembly, decrease the loss of manufacturing material cost; Namely the area that normal 156 polysilicon chips that equivalent material compared by the battery prepared under this scheme, assembly only lose 1.96% only reduces by the power stage of 1.96% and component package loss controls 2% ~ 3% equally, and the 156 single-wafer angles that outward appearance and market use are measure-alike.After polycrystalline makes finished product, reprocessing is because the factor such as electrode pattern and edge current leakage is infeasible, is therefore making with regard to cutting processing profile in process, amendment electrode pattern.

Processing method of the present invention avoids originally directly to be scrapped or does fragment and buy back and cut into slices to production of polysilicon business again ingot casting by a unfilled corner sheet part, a part is undersold to the developer doing the micro generation such as Lawn lamp, garden lamp equipment, reduce waste and the cost of factory, add the input-output ratio of enterprise.

Accompanying drawing explanation

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

Fig. 1 b. is the size diagram of 156-200 after 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, be due to back electrode difference therefore medial section hollow out figure be not equal to monocrystalline;

Fig. 3. be front electrode figure: positive electrode pattern and conventional polycrystalline 156-220 similar, 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 that large test machine power test I-V curve chart won by conventional polycrystalline 156-220 assembly;

Fig. 4 b wins large test machine power test I-V curve chart for cutting polycrystalline 156-200 assembly.

Embodiment

Embodiment:

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

Table 1. laser machine optimum configurations

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

156 polysilicon areas wherein before processing are 24336 square millimeters, after processing 156 single-wafer edged surfaces to amass be 23860 square millimeters.

2, by treating goods and contrast crowd 156-220 to use Italian Baccini printing machine to carry out after above-mentioned cutting polishing, silk-screening approach prints electrode, electric field, and 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 BerGer test machine to carry out the test and classify 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, in use company, 1.8mm wide welding band carries out welding connection processing 60pcs battery component model;

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

4.3, test the parameters such as two pieces of contrast assembly power stages 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

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 difference of same transitions efficiency gear (16.8%) only gear (5W/ shelves), theoretical power output difference 1.96%, under the prerequisite of equal-wattage loss, 156-200 power output should be 239.9*98.04%=235.1704W, but in fact 233.7W<235.2W be due to the series resistance Rs of 156-200 cell piece own a little more than conventional 156-220 battery so the power loss 2.85%>2.22% of assembly causes, can say that the power loss of this part increase balances out completely by the optimization of production technology and reach theoretical power output, integrated testability curve is substantially identical there is no larger difference therefore assembly without quality problems.

Claims (1)

1. the processing method of a polysilicon unfilled corner sheet, it is characterized in that, key step is utilize laser cutting device that 156 polysilicon unfilled corner sheets are cut into the external dimensions of monocrystalline 156, after the printing of electrode, electric field, the method identical with routine is used to carry out the processing process of battery and assembly, final subassembly product possesses identical outward appearance with monocrystalline 156 product, in order to enroll system power station construction in make full use of;

Concrete steps are as follows:

The first step, treats lower step process by after unified for the 156 polysilicon unfilled corner sheets produced in Workshop Production workshop section preparation to plated film before silk screen printing;

Second step, calls in the outward appearance that all unfilled corner sheets are processed as 156 monocrystalline by laser cutting machine by establishment 156 monocrystalline fillet graphic file; Use 12 ~ 12.4A, can to carry out cutting with the speed of 8 ~ 10mm/s varying sized for the laser of 13KHz;

3rd step, uses fine sandpaper to carry out corner polishing at goods to avoid more sharp-pointed edge to occur by well cutting; The order number of fine sandpaper is 800 orders or thinner;

4th step, utilize screen printing technique to prepare electrode, the electric field with the polysilicon chip of monocrystalline 156 external dimensions by what handle well at goods, printing parameter is as follows, and silk-screen printing technique parameter is as follows:

Silk screen spacing is 1700um, and the scraper degree of depth is 1600um, and squeegee pressure is 82N, and print speed printing speed is 220mm/s, and feed back speed is 500mm/s;

Battery electrode, electric field weight parameter are as follows:

156-200 polysilicon unfilled corner sheet at the supplementary product onsumption of goods is: backplate consumes 0.022g, and back surface field consumes 1.33g, and front electrode consumes 0.101g, and wherein, 156-200 represents that in the goods length of side be 156mm, and diagonal is 200mm;

5th step, to prepare assembly finished product ready for next step resultant battery sheet to be carried out test and classify; Before test should by being printed with electrode in the 4th step, the area correction at goods of electric field is 156 monocrystalline silicon area 23860 square millimeters;

6th step, prepares assembly by same shelves cell piece series welding, lamination and carries out the use of module testing stepping in order to system power station.