CN207381412U - P-type PERC double-sided solar batteries, component and system - Google Patents

Abstract

The utility model discloses a kind of p-type PERC double-sided solar batteries, including the silver-colored main grid of the back of the body, alum gate line, back side silicon nitride, backside oxide aluminium film, P-type silicon, N-type emitter, front side silicon nitride film and positive silver electrode；The back side silicon nitride and backside oxide aluminium film form 30 500 lbg areas being arranged in parallel after lbg, at least 1 group of lbg unit is set in each lbg area, lbg area and alum gate line are in the same direction, and alum gate line is connected by lbg area with P-type silicon；The alum gate line is intersected with the silver-colored main grid of the back of the body with certain inclination angle, 10 ° of 90 ° of ＜ inclinations angle ＜；The alum gate outline border is cubic frame, and alum gate outline border is connected respectively with alum gate line and the silver-colored main grid of the back of the body.The invention also discloses a kind of p-type PERC double-sided solar batteries, component and systems.Using the utility model, can two-sided absorption sunlight, expand the application range of solar cell and improve photoelectric conversion efficiency.

Description

P-type PERC double-sided solar batteries, component and system

Technical field

The utility model is related to area of solar cell more particularly to a kind of p-type PERC double-sided solar batteries；This practicality It is new to further relate to a kind of p-type PERC double-sided solar batteries, component and system.

Background technology

Crystal silicon solar batteries are a kind of effectively absorption solar radiant energies, and electricity is converted optical energy into using photovoltaic effect Can device, when solar irradiation is in semiconductor P-N junction, form new electron-hole pair, it is empty under the action of P-N junction electric field Cave flows to P areas by N areas, and electronics flows to N areas by P areas, and electric current is just formed after connecting circuit.

Conventional crystalline silicon solar cell substantially only with front passivating technique, is sunk in front side of silicon wafer with the mode of PECVD One layer of silicon nitride film of product reduces recombination rate of few son in front surface, can significantly be promoted crystal silicon battery open-circuit voltage and Short circuit current flow, so as to promote the photoelectric conversion efficiency of crystal silicon solar battery.

As the requirement of the photoelectric conversion efficiency to crystal silicon battery is higher and higher, people begin one's study PERC the back of the body passivation sun Battery technology.The focus of industry mainstream producer concentrates on the volume production of single side PERC solar cells at present, and p-type PERC is two-sided too Positive energy battery, since photoelectric conversion efficiency is high, while two-sided absorption sunlight, generated energy higher have more in practical applications Big use value.But p-type PERC double-sided solar batteries are also only grinding of being done in laboratory of some research institutions at present Study carefully, how to optimize to adapt to produce in enormous quantities by the structure of p-type PERC double-sided solar batteries, need art technology The further explore and study of personnel.

The content of the invention

The technical problem to be solved by the utility model is to, a kind of p-type PERC double-sided solar batteries are provided, it can be two-sided Sunlight is absorbed, expand the application range of solar cell and improves photoelectric conversion efficiency.

The technical problem to be solved by the utility model is to, provide a kind of p-type PERC double-sided solar batteries, component and System, can two-sided absorption sunlight, expand solar cell application range and improve photoelectric conversion 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, alum gate outline border, back side silicon nitride, backside oxide aluminium film, P-type silicon, N-type emitter, front side silicon nitride film With positive silver electrode；The back side silicon nitride, backside oxide aluminium film, P-type silicon, N-type emitter, 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 is arranged in parallel after lbg swashs Light slotted zones set at least 1 group of lbg unit in each lbg area, and lbg area and alum gate line are in the same direction, described Alum gate line is connected by lbg area with P-type silicon；The alum gate line is intersected with the silver-colored main grid of the back of the body with certain inclination angle, 10 ° of ＜ 90 ° of inclination angle ＜；

The alum gate outline border is cubic frame, and alum gate outline border is connected respectively with alum gate line and the silver-colored main grid of the back of the body.

As the improvement of above-mentioned technical proposal, overleaf silicon nitride film and backside oxide aluminium film correspond to the position of alum gate outline border Lbg area is additionally provided with, the alum gate outline border is connected by lbg area 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 slot unit is circle, ellipse, triangle, quadrangle, pentagon, hexagon, cross or star-shaped.

As the improvement of above-mentioned technical proposal, it is the rectangular laser of strip that every group of lbg unit, which includes a pattern, Slotted unit.

As the improvement of above-mentioned technical proposal, same lbg unit of organizing is along alum gate line extending direction 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 of the silver-colored main grid 1 of the back of the body is 0.5-5mm；The width of each edge frame of the alum gate outline border is 30-1000 μ m；The radical of the alum gate line is 30-500 items, and the radical for carrying on the back silver-colored main grid is 2-8 items.

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 equipped with a plurality of alum gate being arranged in parallel in cell backside Line not only substitutes full aluminum back electric field in existing single side solar cell, realizes the function of back side extinction, also serves as in back of the body silver electrode Secondary grid structure for conducting electronics.P-type PERC double-sided solar batteries described in the utility model are made, silver paste and aluminium can be saved The dosage of slurry reduces production cost, and realizes two-sided absorption luminous energy, is significantly expanded application range and the raising of solar cell Photoelectric conversion efficiency.

Equally had the advantages that using the component and system of the p-type PERC double-sided solar batteries above-mentioned.

Description of the drawings

Fig. 1 is a kind of structure diagram of p-type PERC double-sided solar batteries of the utility model；

Fig. 2 is a kind of another structure diagram of p-type PERC double-sided solar batteries of the utility model；

Fig. 3 is a kind of another structure diagram of p-type PERC double-sided solar batteries of the utility model；

Fig. 4 is a kind of another structure diagram of p-type PERC double-sided solar batteries of the utility model；

Fig. 5 is that a kind of lbg area first embodiment structure of p-type PERC double-sided solar batteries of the utility model is shown It is intended to；

Fig. 6 is that a kind of lbg area second embodiment structure of p-type PERC double-sided solar batteries of the utility model is shown It is intended to；

Fig. 7 is that a kind of lbg area 3rd embodiment structure of p-type PERC double-sided solar batteries of the utility model is shown It is intended to；

Fig. 8 is that a kind of lbg area fourth embodiment structure of p-type PERC double-sided solar batteries of the utility model is shown It is intended to；

Fig. 9 is that a kind of the 5th example structure of lbg area of p-type PERC double-sided solar batteries of the utility model is shown It is intended to；

Figure 10 is that a kind of lbg area sixth embodiment structure of p-type PERC double-sided solar batteries of the utility model is shown It is intended to；

Figure 11 is that a kind of lbg area sixth embodiment structure of p-type PERC double-sided solar batteries of the utility model is shown It is intended to.

Specific embodiment

It is new to this practicality below in conjunction with attached drawing to make the purpose of this utility model, technical solution and advantage clearer Type is described in further detail.

Existing single side solar cell is equipped with the entire 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 flow Jsc, forces minority carrier away from surface, Shao Shuozai Flowing sub- recombination rate reduces, so as to improve battery efficiency on the whole.However, since full aluminum back electric field is light tight, 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 conversion 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, alum gate outline border 10, back side silicon nitride 3, backside oxide aluminium film 4, P-type silicon 5, N-type emitter 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 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 were arranged in parallel after lbg Lbg area 9 sets at least 1 group of lbg unit 9 in each lbg area, and lbg area 9 and alum gate line are in the same direction, The alum gate line 2 is connected by lbg area 9 with P-type silicon 5；The alum gate line 2 is with the silver-colored main grid 1 of the back of the body with certain inclination angle phase It hands over, 10 ° of 90 ° of ＜ inclinations angle ＜；

The alum gate outline border 10 is cubic frame, and alum gate outline border 10 is connected respectively with alum gate line 2 and the silver-colored main grid 1 of the back of the body.

The utility model is improved existing single side PERC solar cells, no longer equipped 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 9, and alum gate line 2 is printed in the lbg area 9 that these are arranged in parallel, so as to form local connect with P-type silicon 5 It touches, the alum gate line 2 of intensive parallel arrangement, which can not only play, improves open-circuit voltage Voc and short circuit current flow Jsc, reduces minority carrier Recombination rate improves the effect of cell photoelectric transfer efficiency, the full aluminum back electric field of alternative existing single side battery structure, and alum gate Line 2 does not cover the back side of silicon chip comprehensively, and sunlight can be projected between alum gate line 2 in silicon chip, so as to fulfill silicon chip back side Luminous energy is absorbed, greatly improves the photoelectric conversion efficiency of battery.

Preferably, the radical of the alum gate line 2 is corresponding with the number in lbg area, is all 30-500 items, more preferably, institute The radical for stating alum gate line 2 is 80-220 items.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 intersected with the silver-colored main grid 1 of the back of the body with certain inclination angle, 10 ° of ＜ inclinations angle 90 ° of ＜, wherein the silver-colored main grid 1 of the back of the body is continuous straight grid, since back side silicon nitride 3 and backside oxide aluminium film 4 are equipped with lbg area 9, when printing aluminium paste forms alum gate line 2, aluminium paste is filled to lbg area 9 so that alum gate line 2 forms local connect with P-type silicon 5 It touches, can be by electron-transport to alum gate line 2, the silver-colored main grid 1 of the back of the body intersected with alum gate line 2 then collects the electronics on alum gate line 2, thus may be used Know, alum gate line 2 described in the utility model, which plays, improves open-circuit voltage Voc and short circuit current flow Jsc, reduces minority carrier recombination Rate and the effect for transmitting electronics, full aluminum back electric field in alternative existing single side solar cell not only reduce silver paste and aluminium paste Dosage, reduce production cost, and realize two-sided absorption luminous energy, be significantly expanded the application range of solar cell and improve light Photoelectric transformation efficiency.

It should be noted that in printing process, since the viscosity of aluminium paste is larger, the line width of halftone is again narrow, can be even There is alum gate line 2 and break the situations of grid in you.There is black and breaks grid in the image that grid can cause EL to test that breaks of alum gate line 2, meanwhile, alum gate line 2 disconnected grid can also influence the photoelectric conversion efficiency of battery, be unfavorable for promoting battery quality and performance.For this purpose, the utility model back side Electrode is additionally provided with alum gate outline border 10, and aluminium paste is identical with alum gate line 2 used by alum gate outline border 10.Since its shape is cubic side Frame can be connected with the alum gate line 2 in horizontal direction, can be also connected with the back of the body silver main grid 1 on vertical direction.When alum gate line 2 goes out Now breaking grid can not be by electron-transport to when carrying on the back silver-colored main grid 1, and electronics can be transferred to other alum gate lines 2 and back of the body silver by alum gate outline border 10 On main grid 1, solve the problems, such as alum gate line 2 break caused by grid the disconnected grid of EL tests and photoelectric conversion efficiency it is low.

Using lbg technology, overleaf silicon nitride film and backside oxide aluminium film correspond to the position of alum gate outline border 10 and are equipped with Aluminium frame slotted zones, the alum gate outline border 10 are connected by aluminium frame slotted zones with P-type silicon.It should be noted that actual conditions should be regarded Depending on whether the aluminium frame slotted zones are set.

Prior art alum gate line is usually what is intersected vertically with the silver-colored main grid of the back of the body, and the utility model is in silver-colored 1 position of main grid of the back of the body In the case of constant, the alum gate line 2 that previous level is set is changed to certain inclination angle intersect with the silver-colored main grid 1 of the back of the body, 10 ° 90 ° of ＜ inclinations angle ＜, has found by contrast experiment, and in the case that alum gate line 2 intersects with the silver-colored inclination of main grid 1 of the back of the body, electric current bigger has Beneficial to the collection of electronics.

Preferably, when alum gate line is intersected with the silver-colored main grid of the back of the body with certain inclination angle, during 45 ° of 10 ° of ＜ inclinations angle ＜, it is main to carry on the back silver Grid are equipped with 4-8 roots；When alum gate line is intersected with the silver-colored main grid of the back of the body with certain inclination angle, during 90 ° of 45 °≤inclination angle ＜, silver-colored main grid is carried on the back Equipped with 2-6 roots.

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 radical of the silver-colored main grid 1 of the back of the body is 2-8 items.

It should be noted that when setting 2 groups or 2 groups or more lbg units 9 in each lbg area, each group swashs Light slotted unit 9 is 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, It is ellipse, triangle, quadrangle, pentagon, hexagon, cross or star-shaped.

It is further illustrated below by specific example：

1. the identical situation of the pattern of the lbg unit 9 in each lbg area：

1.1 is identical with group 9 pattern of lbg unit

1.1.1 such as Fig. 5, equipped with 1 group of lbg unit 9, lbg unit 9 is continuous item in each lbg area 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 equipped with 2 groups or 2 groups or more 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 prolongs equipped with 1 group of lbg unit 9, lbg unit 9 along alum gate line Direction compartment arrangement is stretched, can be circle, ellipse, triangle, quadrangle, pentagon, six with 9 pattern of lbg unit is organized Side shape, cross or star-shaped, example is rectangle in figure.

1.1.4 such as Fig. 8, each lbg area is equipped with 2 groups or 2 groups or more lbg units 9（Example is 3 in figure Group）, lbg unit 9 by compartment arrange, 9 pattern of lbg unit can be circle, ellipse, triangle, quadrangle, Pentagon, hexagon, cross or star-shaped, example is rectangle in figure.

1.2 differ with 9 pattern of group lbg unit

1.2.1 such as Fig. 9, each lbg area is arranged equipped with 1 group of lbg unit 9, lbg unit 9 by compartment Row, 9 pattern of lbg unit can be circle, ellipse, triangle, quadrangle, pentagon, hexagon, cross or star-shaped, 9 pattern of lbg unit is not exactly the same.

1.2.2 such as Figure 10, each lbg area is equipped with 2 groups or 2 groups or more lbg units 9, lbg unit 9 It is arranged along alum gate line extending direction compartment, 9 pattern of lbg unit can be continuous long line segment, circle, ellipse, triangle Shape, quadrangle, pentagon, hexagon, cross or star-shaped, the lbg units 9 in difference group lbg units 9 arrange Partly different or all different, example is the whole different situations of different groups of lbg units 9 in figure.

2. the not exactly the 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-Fig. 9, such as Figure 11 or except lbg unit 9 is company 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 identical above, it 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 identical, also can be different.

The width in lbg area 9 described in the utility model is 10-500 μm；Alum gate line positioned at 9 lower section of lbg area 2 width is more than the width in lbg area 9, and the width of alum gate line 2 is 30-550 μm.Above-mentioned 2 width of alum gate line selection compared with Big such as 500 μm of numerical value, and multigroup lbg area 9 can be side by side located at by the selection of 9 width of lbg area compared with such as 40 μm of fractional value On same 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 equipped with a plurality of alum gate line being arranged in parallel 2, it not only substitutes full aluminum back electric field in existing single side solar cell and realizes back side extinction, the secondary grid knot being additionally operable in back of the body 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 reduces production cost, and realizes two-sided absorption luminous energy, and the application range and raising photoelectricity for being significantly expanded solar cell turn Change efficiency.

Correspondingly, a kind of p-type PERC double-sided solar battery components are also disclosed in the utility model, it is two-sided including p-type PERC 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, from top to bottom sequentially connected high tempered glass thoroughly, Ethylene-vinyl acetate copolymer EVA, PERC solar cell, ethylene-vinyl acetate copolymer EVA and high tempered glass group thoroughly Into.

Correspondingly, a kind of p-type PERC double-sided solar systems are also disclosed in the utility model, including the two-sided sun of p-type PERC 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, accumulator group, charging-discharging controller inverter, AC power distribution cabinet/AC distribution panel and too Positive tracking control system.Wherein, PERC solar energy systems can be equipped with accumulator group, charging-discharging controller inverter, can also Accumulator group, charging-discharging controller inverter are not set, and those skilled in the art can be configured according to actual needs.

It should be noted that in PERC solar cell modules, PERC solar energy systems, except the two-sided sun of p-type PERC Component outside energy battery, is designed with reference to the prior art.

Finally, it should be noted that above example is only to illustrate 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 field it is common It will be appreciated by the skilled person that the technical solution of the utility model can be modified or replaced equivalently, without departing from this reality With the spirit and scope of new technique scheme.

Claims (9)

1. a kind of p-type PERC double-sided solar batteries, which is characterized in that including the silver-colored main grid of the back of the body, alum gate line, alum gate outline border, the back side Silicon nitride film, backside oxide aluminium film, P-type silicon, N-type emitter, front side silicon nitride film and positive silver electrode；The back side silicon nitride silicon Film, backside oxide aluminium film, P-type silicon, N-type emitter, front side silicon nitride film and positive silver electrode stack gradually connection from bottom to up；

The back side silicon nitride and backside oxide aluminium film form the 30-500 laser being arranged in parallel after lbg and open Slot area sets at least 1 group of lbg unit in each lbg area, and lbg area and alum gate line are in the same direction, and alum gate line leads to Laser slotted zones are crossed with P-type silicon to be connected；The alum gate line is intersected with the silver-colored main grid of the back of the body with certain inclination angle, 10 ° of ＜ inclinations angle ＜ 90°；

The alum gate outline border is cubic frame, and alum gate outline border is connected respectively with alum gate line and the silver-colored main grid of the back of the body.

2. p-type PERC double-sided solar batteries as described in claim 1, which is characterized in that overleaf silicon nitride film and back side oxygen The position that change aluminium film corresponds to alum gate outline border is additionally provided with aluminium frame slotted zones, and the alum gate outline border passes through aluminium frame slotted zones and P-type silicon phase Even.

3. p-type PERC double-sided solar batteries as claimed in claim 2, which is characterized in that every group of lbg unit is included extremely Few 1 lbg unit, the pattern of lbg unit is circle, ellipse, triangle, quadrangle, pentagon, six sides It is shape, cross or star-shaped.

4. p-type PERC double-sided solar batteries as claimed in claim 3, which is characterized in that every group of lbg unit includes one A pattern is the rectangular lbg unit of strip.

5. p-type PERC double-sided solar batteries as claimed in claim 3, which is characterized in that same lbg unit of organizing is along alum gate Line extending direction interval type configuration, the spacing distance of two neighboring lbg unit is 0.01-50mm.

6. p-type PERC double-sided solar batteries as described in claim 1, which is characterized in that the width in the lbg area is 10-500μm；The width of alum gate line is 30-550 μm；The width of the silver-colored main grid of the back of the body is 0.5-5mm；The alum gate outline border it is every The width of frame is 30-1000 μm；The radical of the alum gate line is 30-500 items, and the radical for carrying on the back silver-colored main grid is 2-8 items.

7. p-type PERC double-sided solar batteries as described in claim 1, which is characterized in that 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 set in space segmentation；Or the silver-colored main grid of the back of the body is set in space segmentation, passes through company between each adjacent sectional Logical region connection.

A kind of 8. PERC solar cell modules, including PERC solar cells and encapsulating material, which is characterized in that the PERC Solar cell is claim 1-7 any one of them p-type PERC double-sided solar batteries.

9. a kind of PERC solar energy systems, including PERC solar cells, which is characterized in that the PERC solar cells are power Profit requires 1-7 any one of them p-type PERC double-sided solar batteries.