The content of the invention
Technical problem to be solved in the utility model is, there is provided a kind of p-type PERC double-sided solar batteries, can be two-sided
Sunshine is absorbed, expands the application of solar cell and improves photoelectric transformation efficiency.
Technical problem to be solved in the utility model is, there is provided a kind of p-type PERC double-sided solar batteries, component and
System, can two-sided absorption sunshine, expand solar cell application and improve photoelectric transformation efficiency.
In order to solve the above-mentioned technical problem, the utility model provides a kind of p-type PERC double-sided solar batteries, including the back of the body
Silver-colored main grid, alum gate line, grid line spine, back side silicon nitride, backside oxide aluminium film, P-type silicon, N-type emitter stage, front side silicon nitride film
With positive silver electrode;The back side silicon nitride, backside oxide aluminium film, P-type silicon, N-type emitter stage, front side silicon nitride film and positive silver electricity
Pole stacks gradually connection from bottom to up;
What the back side silicon nitride and backside oxide aluminium film formed that 30-500 be arranged in parallel after lbg swashs
Light slotted zones, at least 1 group of lbg unit is set in each lbg area, and the alum gate line passes through lbg area and P
Type silicon is connected;The alum gate line is with carrying on the back silver-colored main grid vertical connection, the grid line spine and alum gate line vertical connection.
As the improvement of above-mentioned technical proposal, when setting 2 groups or more than 2 groups lbg units in each lbg area
When, each group lbg unit be arranged in parallel, and the spacing between two adjacent groups lbg unit is 5-480 μm.
As the improvement of above-mentioned technical proposal, overleaf silicon nitride film and backside oxide aluminium film correspond to the position of grid line spine
Spine slotted zones are additionally provided with, the grid line spine is connected by spine slotted zones with P-type silicon.
As the improvement of above-mentioned technical proposal, every group of lbg unit includes at least one lbg unit, and laser is opened
The pattern of groove unit is circle, ellipse, triangle, quadrangle, pentagon, hexagon, cross or star.
As the improvement of above-mentioned technical proposal, every group of lbg unit is the rectangular laser of strip including a pattern
Slotted unit.
As the improvement of above-mentioned technical proposal, same lbg unit of organizing is along alum gate line bearing of trend interval type configuration, phase
The spacing distance of adjacent two lbg units is 0.01-50mm.
As the improvement of above-mentioned technical proposal, the width in the lbg area is 10-500 μm;The width of alum gate line is
30-550μm;The width for carrying on the back silver-colored main grid is 0.5-5mm;When the grid line spine is made of aluminium paste, width is 30-550 μm;Institute
When stating grid line spine and being made of silver paste, width is 30-60 μm, the grid line spine and alum gate line vertical connection;
The radical of the alum gate line is 30-500 bars;The radical of the silver-colored main grid of the back of the body is 2-8 bars.
As the improvement of above-mentioned technical proposal, the radical of the alum gate line is 30-500 bars;The radical of the silver-colored main grid of the back of the body
For 2-8 bars.
As the improvement of above-mentioned technical proposal, the silver-colored main grid of the back of the body is continuous straight grid;Or the silver-colored main grid of the back of the body is in interval point
Section is set;Or the silver-colored main grid of the back of the body is set in space segmentation, is connected between each adjacent sectional by connected region.
Correspondingly, the utility model also provides a kind of PERC double-sided solar batteries component, including PERC solar cells
And encapsulating material, the PERC solar cells are p-type PERC double-sided solar batteries described in the utility model.
Correspondingly, the utility model also provides a kind of PERC solar energy systems, including PERC solar cells, the PERC
Solar cell is p-type PERC double-sided solar batteries described in the utility model.
Implement the utility model embodiment, have the advantages that:
P-type PERC double-sided solar batteries described in the utility model are provided with a plurality of alum gate be arrangeding in parallel in cell backside
Line, full aluminum back electric field in existing one side solar cell is not only substituted, realize the function of back side extinction, also served as in back of the body silver electrode
Secondary grid structure be used for conduct electronics.The utility model is additionally provided with grid line spine in silicon chip back side, solves the disconnected grid of alum gate line and causes
The disconnected grid of EL tests and the problem of low photoelectric transformation efficiency.P-type PERC double-sided solar batteries described in the utility model are made, can
Silver paste and the dosage of aluminium paste are saved, reduces production cost, and realizes two-sided absorption luminous energy, is significantly expanded answering for solar cell
With scope and improve photoelectric transformation efficiency.
Equally there is above-mentioned advantage using the component and system of the p-type PERC double-sided solar batteries.
Embodiment
It is new to this practicality below in conjunction with accompanying drawing to make the purpose of this utility model, technical scheme and advantage clearer
Type is described in further detail.
Existing one side solar cell is provided with the whole back side that full aluminum back electric field is covered in silicon chip at the back side of battery, entirely
The effect of aluminum back electric field is to improve open-circuit voltage Voc and short circuit current Jsc, forces minority carrier away from surface, Shao Shuozai
Flowing sub- recombination rate reduces, so as to improve battery efficiency on the whole.However, because full aluminum back electric field is light tight, therefore, there is full aluminium
The rear surface of solar cell of back of the body electric field can not absorb luminous energy, positive can only absorb luminous energy, and the synthesis photoelectric transformation efficiency of battery is difficult
To be greatly improved.
For above-mentioned technical problem, as shown in figure 1, the utility model provides a kind of p-type PERC double-sided solar batteries, bag
Include the silver-colored main grid 1 of the back of the body, alum gate line 2, grid line spine 10, back side silicon nitride 3, backside oxide aluminium film 4, P-type silicon 5, N-type emitter stage 6,
Front side silicon nitride film 7 and positive silver electrode 8;The back side silicon nitride 3, backside oxide aluminium film 4, P-type silicon 5, N-type emitter stage 6, just
Face silicon nitride film 7 and positive silver electrode 8 stack gradually connection from bottom to up;
The back side silicon nitride 3 and backside oxide aluminium film 4 form what 30-500 groups be arranged in parallel after lbg
Lbg area, at least 1 group of lbg unit 9 is set in each lbg area, and the alum gate line 2 passes through lbg area
It is connected with P-type silicon 5;The alum gate line 2 is connected with carrying on the back the silver-colored vertical connection of main grid 1, the grid line spine 10 with alum gate line 2.
The utility model is improved to existing one side PERC solar cells, no longer provided with full aluminum back electric field, but
Become many alum gate lines 2, it is sharp using being opened up in lbg technology overleaf silicon nitride film 3 and backside oxide aluminium film 4
Light slotted zones, and alum gate line 2 is printed in the lbg area that these be arranged in parallel, so as to form local connect with P-type silicon 5
Touch, the alum gate line 2 of intensive parallel arrangement, which can not only play, improves open-circuit voltage Voc and short circuit current Jsc, reduces minority carrier
Recombination rate, improve the effect of cell photoelectric conversion efficiency, the full aluminum back electric field of alternative existing one side battery structure, and alum gate
Line 2 does not cover the back side of silicon chip comprehensively, and sunshine can be projected in silicon chip between alum gate line 2, so as to realize silicon chip back side
Luminous energy is absorbed, greatly improves the photoelectric transformation efficiency of battery.
Preferably, the radical of the alum gate line 2 is corresponding with the number in lbg area, is all 30-500 bars, more preferably, institute
The radical for stating alum gate line 2 is 80-220 bars.The alum gate line 2 can be straight line or shaped form, arc, waveform, folding
Linear etc., lbg area shape is corresponding with alum gate line 2, and embodiments thereof is not limited to the utility model illustrated embodiment.
Silicon chip back side is illustrated in figure 2, alum gate line 2 is with carrying on the back silver-colored 1 perpendicular connection of main grid, wherein it is continuous to carry on the back silver-colored main grid 1
Straight grid, because back side silicon nitride 3 and backside oxide aluminium film 4 are provided with lbg area, when printing aluminium paste forms alum gate line 2, aluminium
Slurry filling is to lbg area so that alum gate line 2 forms localized contact with P-type silicon 5, can be by electric transmission to alum gate line 2, with aluminium
The intersecting silver-colored main grid 1 of the back of the body of grid line 2 then collects the electronics on alum gate line 2, it follows that alum gate line 2 described in the utility model plays
Open-circuit voltage Voc and short circuit current Jsc is improved, reduces minority carrier recombination rate, and the effect of transmission electronics, it is alternative existing
There is full aluminum back electric field in one side solar cell, not only reduce silver paste and the dosage of aluminium paste, reduce production cost, and realize double
Face absorbs luminous energy, is significantly expanded the application of solar cell and improves photoelectric transformation efficiency.
It should be noted that in printing process, because the viscosity of aluminium paste is larger, the line width of half tone is again narrow, can be even
There is alum gate line 2 and broken the situations of grid in you.Alum gate line 2 break grid can cause EL test image occur black break grid, meanwhile, alum gate line
2 disconnected grid can also influence the photoelectric transformation efficiency of battery, be unfavorable for lifting battery quality and performance.
Therefore, the utility model backplate is additionally provided with grid line spine 10, grid line spine 10 intersects with alum gate line 2, optimal
Scheme be that grid line spine 10 intersects vertically with alum gate line 2.Grid line spine 10 can be that continuous linear or segmentation are set
Put.During subsection setup, the length of every section of grid line spine can be different.Figure 12 is one way in which.
When the disconnected grid of the appearance of alum gate line 2 can not be by electric transmission to when carrying on the back silver-colored main grid 1, electronics can be transmitted by grid line spine 10
To other alum gate lines 2, then by other alum gate lines 2 by electric transmission to carrying on the back on silver-colored main grid 1, made so as to solve the grid that break of alum gate line 2
Into the disconnected grid of EL tests and the problem of low photoelectric transformation efficiency.
Using lbg technology overleaf silicon nitride film and backside oxide aluminium film correspond to grid line spine 10 position set
Spine slotted zones, the grid line spine 10 are connected by spine slotted zones with P-type silicon.It should be noted that visual actual conditions
Depending on whether the spine slotted zones are set.
Aluminium paste may be selected in grid line spine 10 or silver paste is made, and the width of aluminum grid line spine 10 is 30-550 μm;Silver grid
The width of line spine 10 is 30-60 μm.
The silver-colored main grid 1 of the back of the body described in the utility model can also be in interval point in addition to being illustrated in figure 2 the setting of continuous straight grid
Section is set, as shown in Figure 3.It can also be in that space segmentation is set, and be connected between each adjacent sectional by connected region, such as Fig. 4 institutes
Show.Connected region can be the combination of several figures of triangle, quadrangle, pentagon, circle, arc or more, connected region
At least one, the width of connected region is 0.01-4.5mm.The width of the silver-colored main grid 1 of the back of the body is 0.5-5mm;The silver-colored main grid 1 of the back of the body
Radical be 2-8 bars.
It should be noted that when setting 2 groups or more than 2 groups lbg units 9 in each lbg area, each group swashs
Light slotted unit 9 be arranged in parallel, and the spacing between two adjacent groups lbg unit 9 is 5-480 μm.
Every group of lbg unit 9 includes at least one lbg unit 9, the pattern of lbg unit 9 for it is circular,
Ellipse, triangle, quadrangle, pentagon, hexagon, cross or star.
Further illustrated below by instantiation:
1. the pattern identical situation of the lbg unit 9 in each lbg area:
1.1 is identical with the group pattern of lbg unit 9
1.1.1 such as Fig. 5, each lbg area are provided with 1 group of lbg unit 9, and lbg unit 9 is continuous bar
Shape rectangle, the length of lbg unit 9 are identical with alum gate line length;Or the length of lbg unit 9 is than alum gate line length
Spend short 0.01-5mm;Or the length of lbg unit 9 is longer 0.01-5mm than alum gate line length.
1.1.2 such as Fig. 6, each lbg area is provided with 2 groups or more than 2 groups lbg units 9(Example is 3 in figure
Group), lbg unit 9 is continuous strip rectangle, and the length of lbg unit 9 is identical with alum gate line length;Or swash
The length of light slotted unit 9 is shorter 0.01-5mm than alum gate line length;Or the length of lbg unit 9 is longer than alum gate line length
0.01-5mm。
1.1.3 such as Fig. 7, each lbg area are provided with 1 group of lbg unit 9, and lbg unit 9 prolongs along alum gate line
Direction compartment arrangement is stretched, can be circle, ellipse, triangle, quadrangle, pentagon, six with the pattern of lbg unit 9 is organized
Side shape, cross or star, example is rectangle in figure.
1.1.4 such as Fig. 8, each lbg area is provided with 2 groups or more than 2 groups lbg units 9(Example is 3 in figure
Group), each group lbg unit be arranged in parallel, and the spacing between two adjacent groups lbg unit is 5-480 μm.Lbg
Unit 9 is arranged by compartment, and the pattern of lbg unit 9 can be circle, ellipse, triangle, quadrangle, pentagon, six sides
Shape, cross or star, example is rectangle in figure.
1.2 differ with the pattern of group lbg unit 9
1.2.1 such as Fig. 9, each lbg area are provided with 1 group of lbg unit 9, and lbg unit 9 is arranged by compartment
Row, the pattern of lbg unit 9 can be circle, ellipse, triangle, quadrangle, pentagon, hexagon, cross or star,
The pattern of lbg unit 9 is incomplete same.
1.2.2 such as Figure 10, each lbg area is provided with 2 groups or more than 2 groups lbg units 9, lbg unit 9
Arranged along alum gate line bearing of trend compartment, the pattern of lbg unit 9 can be continuous long line segment, circle, ellipse, triangle
Shape, quadrangle, pentagon, hexagon, cross or star, the lbg unit 9 that difference is organized in lbg unit 9 arrange
Partly different or all different, example is the whole different situations of different groups of lbg units 9 in figure.
2. the incomplete same situation of the pattern of the lbg unit 9 in different lbg areas:
Single lbg area is taken to be combined in above-mentioned Fig. 5-Figure 10, such as Figure 11, or except lbg unit 9 to connect
Outside continuous long line segment situation, with one of which situation to different lbgs in 1.1.1-1.1.4 and 1.2.1-1.2.2 situations
Area carries out different arrangements.
It should be noted that the spacing distance under different situations between lbg area can be with identical above, also can be different.
Spacing distance with the two neighboring lbg unit 9 of group lbg unit 9 is 0.01-50mm, with group lbg list
Spacing distance between member 9 can be with identical, also can be different.
The width in lbg area described in the utility model is 10-500 μm;Alum gate line 2 below lbg area
Width be more than the width in lbg area, the width of alum gate line 2 is 30-550 μm.Selected in the above-mentioned width of alum gate line 2 larger
Such as 500 μm of numerical value, and multigroup lbg area can be located at same by the selection of lbg sector width side by side compared with such as 40 μm of fractional value
On alum gate line 2, ensure that alum gate line 2 and P-type silicon 5 there are enough contacts area.
To sum up, p-type PERC double-sided solar batteries described in the utility model, which change, is provided with a plurality of alum gate line be arrangeding in parallel
2, not only substitute full aluminum back electric field in existing one side solar cell and realize back side extinction, be additionally operable to carry on the back the secondary grid knot in silver electrode
Structure is used as conduction electronics.P-type PERC double-sided solar batteries described in the utility model are made, silver paste and the use of aluminium paste can be saved
Amount, production cost is reduced, and realize two-sided absorption luminous energy, be significantly expanded the application of solar cell and improve photoelectricity turn
Change efficiency.
Accordingly, the utility model is also disclosed a kind of p-type PERC double-sided solar battery components, including p-type PERC two-sided
Solar cell and encapsulating material, the PERC solar cells are any of the above-described p-type PERC double-sided solar batteries.Specifically
, as an embodiment of p-type PERC double-sided solar battery components, its height being from top to bottom sequentially connected thoroughly safety glass,
Ethylene-vinyl acetate copolymer EVA, PERC solar cell, ethylene-vinyl acetate copolymer EVA and high safety glass group thoroughly
Into.
Accordingly, a kind of p-type PERC double-sided solar systems, including the two-sided sun of p-type PERC is also disclosed in the utility model
Energy battery, the PERC solar cells are any of the above-described p-type PERC double-sided solar batteries.As PERC solar energy systems
A preferred embodiment, including PERC solar cells, batteries, charging-discharging controller inverter, AC power distribution cabinet/AC distribution panel and too
Positive tracking control system.Wherein, PERC solar energy systems can be provided with batteries, charging-discharging controller inverter, can also
Batteries, charging-discharging controller inverter are not set, and those skilled in the art can be configured according to being actually needed.
It should be noted that in PERC solar cell modules, PERC solar energy systems, except the two-sided sun of p-type PERC
Part outside energy battery, is designed with reference to prior art.
Finally, it should be noted that above example is only illustrating the technical solution of the utility model rather than to this reality
With the limitation of novel protected scope, although being explained in detail with reference to preferred embodiment to the utility model, this area it is common
It will be appreciated by the skilled person that the technical solution of the utility model can be modified or equivalent substitution, without departing from this reality
With the spirit and scope of new technique scheme.