CN203746867U

CN203746867U - Solar cell with gradually-changing fine grids

Info

Publication number: CN203746867U
Application number: CN201320651188.7U
Authority: CN
Inventors: 李青海; 司红磊; 李俊峰
Original assignee: Jiangsu FGY Energy Storage Research Institute Co Ltd
Current assignee: Shenzhen Xianjin Clean Power Technology Research Co ltd
Priority date: 2013-10-22
Filing date: 2013-10-22
Publication date: 2014-07-30
Anticipated expiration: 2023-10-22

Abstract

The utility model relates to the solar photovoltaic field, and refers in particular to a solar cell with gradually-changing fine grids. The front of the solar cell employs a design method of gradually-changing fine grids which are designed to change gradually. The mode of gradual change is that the fine grids become thinner from a main grid to two sides. The fine grids are mainly used for collecting electrons generated by a semiconductor silicon wafer for forming a current. The fewer the electrons located at the edge of the cell are, the more the electrons close to the main grid is. The more electrons require the increasing of the widths of the fine grids, so as to better achieve an effect of current collection. The design mode can improve the efficiency of the cell. There is no need of employing the fine grids with bigger widths in case of unnecessary waste because the electrons are fewer, thereby saving front silver paste by 10%.

Description

A kind of solar cell of thin grid gradual change

Technical field

The utility model design photovoltaic field, refers in particular to a kind of solar cell of thin grid gradual change.

Background technology

The traditional energy such as coal, oil signals for help repeatedly, energy problem becomes the bottleneck of restriction economic development day by day, problem, increasing country comes into effect " sunlight program ", exploitation solar energy resources, seek the new power of economic development, solar energy, as the reproducible new forms of energy of one, more and more causes people's concern; Solar cell is future source of energy predicament as new forms of energy, has opened up a new road.

Solar energy power generating is at present higher than traditional energy cost, and Future New Energy Source substitutes traditional energy, and it is inevitable reducing costs; In solar energy manufacturing cost, silicon material cost accounting is the most about 30% ~ 50%, and along with purification technique upgrades, silicon material price drops always, and silicon material cost accounts for cost ratio 30% left and right substantially now; But not silicon cost accounting rises to 20 ~ 40% by original 10%, and silver is starched cost 80% in the middle of non-silicon cost

~ 95%; And the since two thousand six rising all the way of international silver-colored valency, therefore reducing silver slurry cost is the key issue that new forms of energy replace traditional energy.

Summary of the invention

The utility model object is to reduce silver slurry use amount, improves battery efficiency.To achieve these goals solar battery sheet is redesigned, the flow process of adopting new technology, battery front side adopts thin grid gradual change method for designing, the thin grid of battery front side are set as gradual change, the mode of gradual change adopts by main grid to 2 limits, from coarse to fine, vertical two main grids in Fig. 3-Fig. 6, centered by main grid, toward both sides gradual change, one is arrived battery edge, and other end is to mid line, for linear gradient, for example tg in Fig. 4 = ; 29.75 unit is millimeter, also has one section of tg = , 31.25 is half of distance between two main grids.

Thin grid Main Function is exactly that the electronics that produces of collection semiconductor silicon chip accumulates electric current, fewer the closer to battery edge place electron number, more the closer near electron number main grid, the width increase of the thin grid of the more requirements of electron number just can better reach and collect the function of current, gets this method and can promote battery efficiency; Electron number is fewer there is no need to use the thin grid of large width to cause unnecessary waste, and this mode can be saved front silver medal 10%.

Existing battery production silk-screen printing technique comprises three parts printings first steps printing back electrodes (as Fig. 1), second step printing back of the body electric field (as Fig. 2), the 3rd step print electrode (as Fig. 3); Solar cell described in the utility model, first and second step printing is the same with conventional batteries, the 3rd step (as Fig. 4) battery front side adopts thin grid gradual change design, other preparation technologies are with routine techniques technique, save front side silver paste 10%, improve efficient light area simultaneously, promote Isc, promote battery efficiency.

Conventional batteries and the contrast of new design battery efficiency

Brief description of the drawings

Fig. 1 is existing battery back electrode figure; The 1st, back electrode, the 2nd, silicon chip;

Fig. 2 is existing battery back electric field figure; The 1st, back electrode, the 3rd, aluminium back surface field;

Fig. 3 is existing battery positive electrode figure; The 6th, main grid, the 5th, thin grid;

Fig. 4 is the thin grid of battery front side gradual change (0.06-0.04) electrode patterns; The 5th, thin grid, 6 main grids;

Fig. 5 is the thin grid of battery front side gradual change (0.06-0.05) electrode patterns; The 5th, thin grid, 6 main grids;

Fig. 6 is the thin grid of battery front side gradual change (0.07-0.05) electrode patterns; The 5th, thin grid, 6 main grids.

instantiation mode

Below in conjunction with accompanying drawing, principle of the present utility model and feature are described, example, only for explaining the utility model, is not intended to limit scope of the present utility model.

Example one

First step printing back electrode figure is as Fig. 1, adopt baccini drying oven, 4 warm area set temperatures are to dry at 60,120,160,220 DEG C, second step printing back of the body electric field pattern is as Fig. 2, adopt baccini drying oven, 4 warm area set temperatures are to dry at 60,120,200,250 DEG C, 0.04 micron of 0.06 micron-thin segment of the thick section of the thin grid gradual change of the 3rd step printing, positive electrode figure is as Fig. 4, tg = ; 29.75 unit is millimeter, also has one section of tg = 31.25 is half of distance between two main grids, unit is also millimeter, adopt Despatch sintering furnace, sintering furnace belt speed is 240in/min, 9 warm area settings of sintering are respectively sintering metal at 100,160,280,540,480,550,650,870,950 DEG C, and solar components production technology is identical with conventional assembly production technology.

Example two

First step printing back electrode figure is as Fig. 1, adopt baccini drying oven, 4 warm area set temperatures are to dry at 80,100,180,220 DEG C, second step printing back of the body electric field pattern is as Fig. 2, adopt baccini drying oven, 4 warm area set temperatures are to dry at 100,160,220,240 DEG C, 0.05 micron of 0.06 micron-thin segment of the thick section of the thin grid gradual change of the 3rd step printing, positive electrode figure is as Fig. 5, tg = ; 29.75 unit is millimeter, also has one section of tg = 31.25 is half of distance between two main grids, unit is also millimeter, adopt Despatch sintering furnace, sintering furnace belt speed is 220in/min, 9 warm area settings of sintering are respectively sintering metal at 180,260,320,500,500,520,630,850,940 DEG C, and solar components production technology is identical with conventional assembly production technology.

Example three

First step printing back electrode figure is as Fig. 1, adopt baccini drying oven, 4 warm area set temperatures are to dry at 100,120,200,220 DEG C, second step printing back of the body electric field pattern is as Fig. 2, adopt baccini drying oven, 4 warm area set temperatures are to dry at 120,180,220,240 DEG C, 0.05 micron of 0.07 micron-thin segment of the thick section of the thin grid gradual change of the 3rd step printing, positive electrode figure is as Fig. 5, tg = ; 29.75 unit is millimeter, also has one section of tg = 31.25 is half of distance between two main grids, unit is also millimeter, adopt Despatch sintering furnace, sintering furnace belt speed is 230in/min, 9 warm area settings of sintering are respectively sintering metal at 180,270,380,510,510,540,670,870,930 DEG C, and solar components production technology is identical with conventional assembly production technology.

Claims

1. the solar cell of a thin grid gradual change, it is characterized in that: the shape of the thin grid of described battery front side is to be trapezoidal layout to both sides centered by two main grids, the thin grid that are battery front side are set as gradual change, respectively centered by two main grids, the width of thin grid is from coarse to fine, and toward main grid both sides gradual change, one to battery edge, other end, to battery mid line, fades to linear gradient.

2. the solar cell of a kind of thin grid gradual change as claimed in claim 1, is characterized in that: the width of described thin grid is 0.04mm by 0.06mm linear gradient; Linear gradient tangent value tg = ; Linear gradient tangent value tg = .

3. the solar cell of a kind of thin grid gradual change as claimed in claim 1, is characterized in that: the width of described thin grid is 0.05mm by 0.06mm linear gradient; Tg = , tg = .

4. the solar cell of a kind of thin grid gradual change as claimed in claim 1, is characterized in that: the width of described thin grid is 0.05mm by 0.07mm linear gradient; Tg = , tg = .