CN208538868U - A kind of more main grid high-efficiency battery pieces of compatible half battery - Google Patents

Abstract

The utility model provides a kind of more main grid high-efficiency battery pieces of compatible half battery, including front electrode, silicon substrate, back aluminium electric field and the rear electrode set gradually；Front electrode includes more longitudinal front main grid lines and the lateral secondary grid line in a plurality of front, and the secondary grid line of front main grid line and front is mutually perpendicular to and intersects；Front electrode includes two parts symmetrical above and below, and the both ends of the front main grid line of every part are bifurcation structure, and top and the bottom intermediate region is connected without grid line, forms positive blank area.Back aluminium electric field and rear electrode, which are divided longitudinally into, completes symmetrical two parts, and intermediate blank area is without back surface field and back electrode, and blank sector width is equal to the secondary grid spacing in front, and position is overlapped with positive blank area；Rear electrode is segmented electrodes；Overleaf electrode is connected in transverse direction with back electrode both sides the setting of back aluminium electric field with exterior domain.Battery efficiency can be improved in the structure, reduces silver paste consumption, and realizes that full wafer and half battery are compatible.

Description

A kind of more main grid high-efficiency battery pieces of compatible half battery

Technical field

The utility model belongs to area of solar cell, in particular to a kind of more main grid high-efficiency batteries of compatible half battery Piece.

Background technique

A kind of energy utilization patterns of the solar energy power generating as clean and effective, have obtained global common concern, It is the strategic emerging technology industry of state key development.

Metal electrode is the important major part of solar cell, the effect of electric current collection and transmission is primarily served, to battery Performance has great influence.

The shading angle analysis designed from solar cel electrode, sunlight enter battery, positive metal from battery front side Electrode can block a part of silicon wafer, this part also can not just be transformed into electric energy according to luminous energy on the electrode, from this angle we Wish that grid line is done more thinner better, shading is the smaller the better.But then, the responsibility of grid line is to conduct electric current, from conduction angle Degree analysis, grid line get over that detailed rules and regulations conduction cross-sectional area is smaller, and ohmic loss is bigger, and power loss is also bigger.Therefore main grid and secondary grid The core of design is that balance is obtained between shading and conduction, obtains optimal power of battery output.

It is the important set of battery manufacturing cost since the slurry main component of production grid line is the higher noble silver of price At part.

Under prior art working condition, front electrode main grid bear the responsibility of connection welding belt and can not be too thin, too carefully Main grid will cause welding difficulty, not can guarantee welding pulling force, for balance its shading loss, main grid quantity cannot be too many, this It is exactly the main reason for main grid quantity of current volume production battery is no more than 5.

In the case where die size is certain, less main grid quantity means that distance of the secondary grid between main grid is larger, i.e., The transmission range of electric current is longer, and secondary gate resistance loss is larger.To reduce its resistance loss, it is necessary to increase the cross section of secondary grid line Product, but this increases secondary grid shading loss and slurry consumption simultaneously again.

Half battery is promoted obviously in terms of component power, and reason is to effectively reduce the transmission electric current on welding, is made Welding resistance loss is obtained to be decreased obviously.But the existing electrode pattern based on full wafer battery design can not directly carry out hemisection work Industry cannot achieve the compatibility of full wafer battery and half battery.

Therefore, on the basis of existing battery, by completely new electrode design, realize that battery efficiency is promoted and silver paste consumption Decline, while full wafer and half battery can be compatible with, it appears it is especially urgent.

Utility model content

The purpose of this utility model is the more main grid high-efficiency battery pieces for manufacturing a kind of compatible half battery, and battery can be improved Efficiency reduces silver paste consumption, and realizes that full wafer and half battery are compatible.

To achieve the above object, the technical solution of the utility model is,

A kind of more main grid high-efficiency battery pieces of compatible half battery, including the front electrode, silicon substrate, the back side set gradually Aluminium electric field and rear electrode；Front electrode includes more longitudinal front main grid lines and the lateral secondary grid line in a plurality of front, front The secondary grid line of main gate line and front is mutually perpendicular to and intersects；Front electrode includes two parts symmetrical above and below, and the front of every part is main The both ends of grid line are bifurcation structure, and top and the bottom central contact areas is connected without grid line, form positive blank area；Back aluminium electricity Field and rear electrode are divided longitudinally into symmetrical two parts, and centre forms blank back area, and blank back area is without back surface field and back electrode.

Blank back sector width is equal to the secondary grid spacing in front.

Front main grid line is the solid main grid of both ends bifurcated, and body width is 0.05~0.2mm.

Multiple pads are provided in main gate line, number of pads is 6~20, and bond pad shapes are rectangle, circle or diamond shape.

The width of positive blank area is equal to the spacing of the secondary grid line in two neighboring front.

Back electrode is solid or engraved structure, and pierced pattern is rectangle, circle or diamond shape.

Rear electrode is segmentation structure and forms array arrangement, single-row back electrode on silicon substrate rear electrode along longitudinal direction Number of segment be 4~10, back aluminium electric field setting overleaf electrode with exterior domain.

The distance between adjacent rear electrode is 2~10mm.

The width in blank back area is of same size with positive blank area, and position is identical as positive blank area.

Compared with prior art, the utility model has the beneficial effects that

The utility model is reduced the electric current on every main grid, is reduced on main grid by the more main grid designs of front electrode Resistance loss；The increase of main grid quantity simultaneously, reduces length of the secondary grid between main grid, reduces the transmission on every secondary grid Electric current and transmission range reduce the transmission loss on secondary grid.The decline of main grid and secondary grid transmission electric current is keeping its resistance damage Under the premise of consumption is not increased, its grid line cross-sectional area can be accordingly reduced, therefore effectively reduce grid line shading and slurry consumption, mentioned Manufacturing cost is reduced while high battery efficiency.By the longitudinally asymmetric separate design of positive back side figure, it can be achieved that full wafer With the compatibility of half, the different demands of component are flexibly met.By back electrode and back surface field it is longitudinal be spaced apart design, one side Aluminium paste consumption is reduced, welding difficulty caused by the other hand solving because of back surface field and backplane difference in height improves rear electrode Welding quality and assembly reliability.

Further, it is designed by front main grid both ends and intermediate bifurcation structure, so that far from edge when welding of battery film, Edge stress concentration is avoided to cause fragment.

Detailed description of the invention

Fig. 1 is the more main grid high-efficiency battery piece front schematic views of the utility model；

The more main grid high-efficiency battery piece schematic rear views of Fig. 2 the utility model；

Wherein: 1- front main grid line, the secondary grid line in the front 2-, the front 3- blank area, 4- back aluminium electric field, 5- rear electrode, 6- blank back area, 7- bifurcation structure.

Specific embodiment

The technology of the utility model is described in detail with reference to the accompanying drawing:

As illustrated in fig. 1 and 2, a kind of more main grid high-efficiency battery pieces of compatible half battery, including front electrode, back aluminium electricity Field and rear electrode.Front electrode includes 10~30 longitudinal front electrode main gate lines 1 and a plurality of secondary grid line being laterally arranged 2, every main gate line 1 and secondary grid line 2 are mutually perpendicular to and intersect；Rear electrode is single-row 4~10 back electrodes, columns and position It is corresponding with front electrode main gate line 1.Front electrode is divided longitudinally into full symmetric two parts, and positive blank area 3 connects without grid line It connects, positive 3 width of blank area is equal to secondary grid spacing.Back side Al-BSF 4 and rear electrode 5, which are divided longitudinally into, completes symmetrical two Point, blank back area 6 connect without back surface field with back electrode, and 6 width of blank back area is equal to secondary 2 spacing of grid line in front, and position and It is overlapped at positive blank area 3.

The main gate line 1 of front electrode is the solid main grid that there is bifurcation structure at both ends, and width is 0.05~0.2mm.

Main gate line 1 is parallel to each other, and left and right is uniformly and symmetrically distributed；Multiple pad points, number of pads are provided in main gate line 1 It is 6~20, bond pad shapes are rectangle, circle, diamond shape or polygon, and pad width is 0.5~1.5mm.

Rear electrode is the back electrode of segmented, and single-row back electrode number of segment is 4~10, and back electrode is solid or hollow out knot Structure, pierced pattern are rectangle, circle, diamond shape or other polygons.

Back surface field is that overleaf electrode is prepared with exterior domain, is connected in transverse direction with back electrode both sides, is used for collected current； Lower and back electrode is spaced apart certain distance in the longitudinal direction, is spaced apart is equidistant as 2~10mm up and down.

The utility model principle are as follows: designed by the more main grids of front electrode, reduce the electric current in every main gate line, reduced Resistance loss on main grid；The increase of main grid quantity simultaneously, reduces length of the secondary grid between main grid, reduces every secondary grid On transmission electric current and transmission range, reduce the transmission loss on secondary grid.

The decline of main grid and secondary grid transmission electric current can accordingly reduce it under the premise of keeping its resistance loss not increased Grid line cross-sectional area, therefore grid line shading and slurry consumption are effectively reduced, manufacture is reduced while improving battery efficiency Cost.

By the longitudinally asymmetric separate design of positive back side figure, it can be achieved that the compatibility of full wafer and half, flexibly meets The different demands of component.

By front main grid both ends and intermediate bifurcation structure design, so that avoiding side far from edge when welding of battery film Fiber stress concentration causes fragment.

By back electrode and back surface field it is longitudinal be spaced apart design, on the one hand reduce aluminium paste consumption, on the other hand solve because Welding difficulty caused by back surface field and backplane difference in height improves the welding quality and assembly reliability of rear electrode.

In addition, the above embodiment of the utility model is embodiment, have and claims of the utility model Technical idea is allowed to identical method and plays the technical solution of identical function and effect, is all contained in the utility model.

Claims (9)

1. a kind of more main grid high-efficiency battery pieces of compatible half battery, it is characterised in that: including front electrode, the silicon set gradually Matrix, back aluminium electric field and rear electrode (5)；Front electrode includes a plurality of of longitudinal more front main grid lines (1) and transverse direction Positive pair grid line (2), the secondary grid line (2) of front main grid line (1) and front are mutually perpendicular to and intersect；Front electrode includes symmetrical above and below Two parts, the both ends of the front main grid line (1) of every part are bifurcation structure (7), and top and the bottom central contact areas is without grid Line connection forms positive blank area (3)；Back aluminium electric field (4) and rear electrode (5) are divided longitudinally into symmetrical two parts, intermediate It is formed blank back area (6), blank back area (6) are without back surface field and back electrode.

2. a kind of more main grid high-efficiency battery pieces of compatible half battery according to claim 1, it is characterised in that: the back side is empty White area (6) width is equal to the secondary grid spacing in front.

3. a kind of more main grid high-efficiency battery pieces of compatible half battery according to claim 1, it is characterised in that: front is main Grid line (1) is the solid main grid of both ends bifurcated, and body width is 0.05~0.2mm.

4. a kind of more main grid high-efficiency battery pieces of compatible half battery according to claim 1, it is characterised in that: front is main Multiple pads are provided on grid line (1), number of pads is 6~20, and bond pad shapes are rectangle, circle or diamond shape.

5. a kind of more main grid high-efficiency battery pieces of compatible half battery according to claim 1, it is characterised in that: front is empty The width in white area (3) is equal to the spacing of the secondary grid line (2) in two neighboring front.

6. a kind of more main grid high-efficiency battery pieces of compatible half battery according to claim 1, it is characterised in that: back electrode For solid or engraved structure, pierced pattern is rectangle, circle or diamond shape.

7. a kind of more main grid high-efficiency battery pieces of compatible half battery according to claim 1, it is characterised in that: back side electricity Pole (5) forms for segmentation structure and on silicon substrate array arrangement along longitudinal direction, and single-row back electrode number of segment is 4~10, the back side Aluminium electric field (4) setting overleaf electrode (5) with exterior domain.

8. a kind of more main grid high-efficiency battery pieces of compatible half battery according to claim 6, it is characterised in that: adjacent two The distance between section rear electrode is 2~10mm.

9. a kind of more main grid high-efficiency battery pieces of compatible half battery according to claim 1, it is characterised in that: the back side is empty The width in white area (6) is of same size with positive blank area (3), and position is identical as positive blank area (3).