CN205282485U - Solar cell's back electrode - Google Patents

Abstract

The utility model discloses an enough effective solar cell's back electrode who improves the welding pulling force, optimizes structure belong to the solar energy photovoltaic technique field, and it includes that strip body and a plurality of locate the stress relief part of body both sides, the body both sides all are provided with a plurality of breachs, and the breach equipartition is arranged and the breach width is 0.1mm~3mm, stress relief part locates breach open position to body outside extension. The utility model discloses the periphery of back electrode sets up the breach, can effectively reduce the thick liquids use amount, and welds when welding in the tin of taking permeates these breachs, forms the structure in the embedding back electrode, has strengthened greatly and has welded the welding pulling force between area and the back electrode, the stress relief part who sets up, the tin of embedding in the time of can releasing the welding effectively and the stress between the back electrode reduce the piece rate, reduce solar cell's manufacturing cost.

Description

The back electrode of solaode

Technical field

This utility model relates to a kind of back electrode of solar cell structure, belongs to solar-photovoltaic technology field.

Background technology

Along with the long-term substantial amounts of use of the traditional energy such as coal and oil, these traditional energies are faced with day by day exhausted crisis, also bring serious pollution to global environment simultaneously. In recent years, people recognize more and more consumingly and find importance cleaning, reproducible novel energy. Solar energy power generating has the new forms of energy of this feature just, and photovoltaic module can directly convert light to electric energy, and the development of its technology brings revolutionary change with progressive to the energy demand in the world.

At present, crystal silicon solar batteries is active status in field of photovoltaic power generation. Adopt crystal silicon chip to manufacture battery, then battery welding is coupled together, and be packaged into assembly. Photovoltaic module to have higher photoelectric transformation efficiency, good reliability and weatherability. In prior art, the structure (with reference to accompanying drawing 1) of solaode mainly includes back electrode 10, back of the body electric field 20 and is arranged on the Stress Release portion 30 of back electrode 10 periphery, back electrode and back of the body electric field sequentially pass through silk screen printing at rear surface of solar cell, back of the body electric field is connected with the edge of back electrode, back electrode is used as the welding position of welding, it is achieved electric current collection and the electrical connection between cell piece. Stress Release portion is in order to solve back of the body electric field, between back electrode and silicon substrate three, because material difference causes stress, the stress produced during welding of battery film is caused to make fragmented problem and arrange, so Stress Release portion is fitly arranged on the surrounding up and down of back electrode mostly, and overlap with back of the body electric field.

But, weld except requiring to reach electric current is had good collection between welding with welding position, also requirement must have the reliability of excellence, uses the welding that can continue to keep good for more than 20 years out of doors under environment. Bigger weld pulling force therefore it is required that have between welding with welding position, there is good reliability and weatherability. And the pulling force that welds between the back electrode of said structure and welding is generally less than 5N, under long-term work environment out of doors, there is significantly high failure risk. Therefore, how optimizing back electrode structure design, improving welding pulling force thus strengthening assembly reliability, be photovoltaic field one of the technical barrier being badly in need of solving.

Utility model content

The purpose of this utility model is the back electrode of a kind of solaode improving welding pulling force, optimization structure, enhancing assembly reliability of design.

For achieving the above object, this utility model adopts the following technical scheme that

A kind of back electrode of solaode, it includes strip body and several are located at the Stress Release portion of body both sides; Body both sides are provided with multiple breach, and the uniform arrangement of breach and gap width are 0.1mm��3mm; Stress Release portion is located at gap opened position and extends to outer body.

Preferably, notch length is less than or equal to 1/2nd of body width.

Preferably, notch geometry is rectangle, arc, triangle, polygon or irregularly shaped.

Preferably, the breach of body both sides is in dislocation arrangement.

Compared with prior art the beneficial effects of the utility model are: one is the breach arranging uniform arrangement in back electrode both sides, and at the aperture position of breach to the some Stress Release portions of back electrode arranged outside, optimize the overall structure of rear surface of solar cell electrode, also effectively reducing slurry makes consumption simultaneously, reduce the manufacturing cost of solaode, increase economic efficiency; Two is when postorder welds, stannum on welding penetrates in these breach of back electrode both sides, stannum after cooling just forms the structure embedded in back electrode, so greatly strengthen and weld pulling force between welding with back electrode, significantly enhance solar module long term reliability and service life; Three is to back electrode arranged outside Stress Release portion at the aperture position of breach, stress between the stannum and the back electrode that embed when can effectively discharge welding, reduce fragment rate during welding, improve the qualification rate that solar module manufactures, greatly reduce percent defective; Four is that this utility model scheme can be mutually compatible with existing technology and equipment, it is not necessary to increase extra cost, is suitable for large-scale industrial production, and effect is obvious, has the practical value of highly significant.

Accompanying drawing explanation

Fig. 1 is the structure schematic diagram of solaode in prior art;

Fig. 2 is the structural representation of the back electrode of this utility model solaode;

Fig. 3 is the rear surface of solar cell structural representation being printed on structure back electrode shown in Fig. 3;

Fig. 4 is the back electrode structure schematic diagram of this utility model the second embodiment.

Detailed description of the invention

In order to make the technical solution of the utility model become apparent from, below in conjunction with accompanying drawing 2-4, this utility model is described in detail. It should be appreciated that the detailed description of the invention described in this specification is only used to explain this utility model, it is not intended to limit protection domain of the present utility model.

Embodiment 1: with reference to accompanying drawing 2, this utility model is the back electrode of a kind of solaode, it includes strip body 1 and several are located at the Stress Release portion 2 of body 1 both sides, in figure, Stress Release portion 2 illustrates with short-term, Stress Release portion 2 can adopt line style, triangle, semicircle etc., Stress Release portion 2 is prior art, and therefore not to repeat here; The left and right sides of body 1 is provided with multiple breach 3, the uniform arrangement of breach 3, and namely body 1 both sides breach 3 is symmetrical and distance between homonymy adjacent gap 3 is identical; Breach 3 is shaped as rectangle, and breach 3 width is 0.1mm��3mm, and breach 3 length is less than or equal to 1/2nd of body 1 width; Stress Release portion 2 is positioned at two side positions of breach 3 opening and extends outside body 1, does not namely have the region of breach 3 to arrange Stress Release portion 2 laterally at back electrode body 1.

Above-mentioned breach 3 shape can also be set to arc, triangle, polygon or irregularly shaped etc.

With reference to accompanying drawing 3, in solaode manufacture process, first pass through silk screen printing back electrode of this utility model scenario-frame on rear surface of solar cell prints, then again through silk screen printing is carried on the back electric field 4, back electrode printing can adopt silver slurry, back of the body electric field 4 printing can adopt aluminium paste, and then forms the rear surface of solar cell structure as shown in the figure with breach 3; When postorder welds, stannum on welding penetrates in these breach 3, stannum after cooling just forms the structure embedded in back electrode, so greatly strengthen and welds pulling force between welding with back electrode, significantly enhances solar module long term reliability and service life; Meanwhile, at the aperture position of breach 3 to back electrode arranged outside Stress Release portion 2, it is possible to the stress between the stannum and the back electrode that effectively embed during release welding, fragment rate during welding is reduced; It addition, after arranging, on back electrode, the breach 3 concaving towards back electrode, both optimized the overall structure of rear surface of solar cell electrode, also effectively reduce slurry and make consumption, reduce the manufacturing cost of solaode.

Embodiment 2: on the basis of embodiment 1, with reference to accompanying drawing 4, this utility model is the back electrode of a kind of solaode, the breach 3 on the left of its body 1 and right side arranges asymmetric, and the breach 3 of body 1 left and right sides is in dislocation arrangement, so make welding pulling force more uniform, further improve solaode long term reliability, substantially increase product service life. This utility model is simple, it is possible to combine with existing technology completely, it is not necessary to increases extra cost and the bright work of effect, has the practical value of highly significant.

Claims (4)

1. the back electrode of a solaode, including strip body (1) and several be located at the Stress Release portion (2) of body (1) both sides, it is characterized in that: it is 0.1mm��3mm that body (1) both sides are provided with multiple breach (3), breach (3) uniform arrangement and breach (3) width; Stress Release portion (2) is located at breach (3) aperture position and extends to body (1) outside.

2. the back electrode of solaode according to claim 1, it is characterised in that: breach (3) length is less than or equal to 1/2nd of body (1) width.

3. the back electrode of solaode according to claim 1, it is characterised in that: breach (3) is shaped as rectangle, arc, triangle, polygon or irregularly shaped.

4. the back electrode of the solaode according to any one claim in claim 1-3, it is characterised in that: the breach (3) of body (1) both sides is in dislocation arrangement.