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Process for producing electrode wire for solar battery

A technology of solar cells and manufacturing methods, which is applied to circuits, photovoltaic power generation, electrical components, etc., can solve problems such as semiconductor substrates that are prone to cracks, and achieve excellent power generation efficiency and excellent conductivity

Active Publication Date: 2008-09-24
HITACHI METALS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when the conventional crushed wire is used as the electrode wire of the core material, there is a problem that cracks are easily generated on the semiconductor substrate during welding.

Method used

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  • Process for producing electrode wire for solar battery
  • Process for producing electrode wire for solar battery
  • Process for producing electrode wire for solar battery

Examples

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Effect test

Embodiment 1

[0040] Various clad materials having a plate thickness of 160 μm having intermediate layers of various thicknesses were fabricated. The above-mentioned cladding material is produced by the following method: on both sides of the intermediate layer raw material composed of an aluminum plate (material JIS 1N90, Al: 99.90mass%, annealed material) or an invar alloy plate (Fe-36.5mass% Ni, annealed material) , superimpose the surface layer raw material composed of oxygen-free copper plate (Cu: 99.97mass%, O: 15ppm, plate thickness 1.0mm, annealed material), press-bond the superimposed material at a reduction rate of 70%, and further press-bond the superimposed material at a reduction rate of 50-80%. The reduction rate of the crimping material is fine-rolled. Table 1 shows the ratio of the total reduction rate from the layered material to the cladding material and the thickness of the intermediate layer to the overall thickness of each cladding material. On the other hand, the above...

Embodiment 2

[0050] An aluminum plate (thickness: 0.5 mm) and a copper plate (thickness: 1.0 mm) made of oxygen-free copper were prepared to prepare a clad material with a final thickness of 200 μm. The above-mentioned cladding material is produced by superimposing the above-mentioned copper plate on both sides of the above-mentioned aluminum plate, crimping the superposed material at a reduction rate of 65-75%, and further finishing rolling the crimped material. The total reduction from superimposed material to cladding material is 92%. On the other hand, a copper plate (plate thickness: 2.5 mm) of oxygen-free copper was rolled to produce a Cu single-layer material (copper plate) with a thickness of 200 μm. Thereafter, these cladding materials and Cu single-layer materials were cut, respectively, to produce strip-shaped primary core materials with a width of 2 mm. The cladding material and the Cu single-layer material described above respectively constitute the core material raw material...

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Abstract

To provide a process for producing an electrode wire for a solar battery that can easily produce an electrode wire for a solar battery, which can easily be plastically deformed by thermal stress produced in a semiconductor substrate to prevent damage caused by thermal stress, without providing a softening annealing step. [MEANS FOR SOLVING PROBLEMS] A process for producing an electrode wire, comprising a core fabrication step of fabricating a material for a core into a strip-shaped core (2) and a molten solder plating step of immersing the core (2) in a molten solder bath and pulling up the core (2) to form molten solder plating layers(3A) and (3B) on the surface of the core (2). In the molten solder plating step, the temperature of the molten solder bath is brought to 250 C or above and 380 C or below, the core immersion time is 6 to 10 sec when the bath temperature is 250 C or above and below 280 C; is 3 to 10 sec when the bath temperature is 280 C or above and 350 C or below; or is 3 to 5 sec when the bath temperature is above 350 C and 380 C or below.

Description

technical field [0001] This invention relates to the manufacturing method of the electrode wire material used as the lead wire for connection of a solar cell. Background technique [0002] like image 3 As shown, the solar cell includes a semiconductor substrate 11 formed of a silicon semiconductor having a PN junction, a plurality of linear surface electrodes 12 arranged in parallel with the surface of the semiconductor substrate 11, and a connecting wire connected to the plurality of surface electrodes 12. Lead 13. The connection leads 13 are soldered to solder strips formed to intersect the plurality of surface electrodes 12 . Usually, in order to obtain a desired electromotive force, a plurality of solar cells are connected in series and used. The series connection of solar cells is carried out in the following manner, one surface (lower surface) of the lead wire for connection is welded to the surface electrode of one solar cell, and the other surface (upper surface) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/04
CPCH01L31/022425Y02E10/50H01L31/05
Inventor 盐见和弘冈田诚石尾雅昭
Owner HITACHI METALS LTD
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