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Conductive adhesive, solar cell string and preparation method of solar cell string

A solar cell and conductive adhesive technology, applied in the field of solar cells, can solve problems such as yield reduction, cell cracking, and fragmentation, and achieve good conductivity, low curing temperature, and reduced bending effects

Active Publication Date: 2015-11-25
YINGLI ENERGY CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses welding to connect, although it can ensure the electrical connection of the positive and negative electrodes on the back of the MWT battery, but because the general welding temperature is above 300°C, and because welding is performed on one side of the battery, it will cause huge thermal stress on the front and back of the battery. , leading to severe bending of the battery sheet, and even cracking and chipping of the battery sheet, thereby reducing the yield rate and increasing the cost

Method used

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  • Conductive adhesive, solar cell string and preparation method of solar cell string
  • Conductive adhesive, solar cell string and preparation method of solar cell string
  • Conductive adhesive, solar cell string and preparation method of solar cell string

Examples

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preparation example Construction

[0054] The present invention also provides a method for preparing the above-mentioned solar battery string, comprising: laying conductive adhesive on the solder joints of the soldering strips, then laying a viscous insulating material between the soldering joints, placing the battery slices, heating the conductive adhesive and pressing the battery slices and the soldering ribbons at the same time , to get the solar cell string.

[0055] Wherein, the conductive adhesive and the viscous insulating material are the same as those described above, and will not be repeated here. The welding ribbon can be a welding ribbon well-known to those skilled in the art, and there is no special limitation.

[0056] Spread conductive glue at the solder joints of the solder strips, and then lay viscous insulating material between the solder joints to prevent the battery sheet, heat the conductive glue and press the battery sheet and the solder ribbon at the same time, the heating temperature is ...

Embodiment 1

[0064] 1.1 50 parts by weight of polyhydroxyethyl methacrylate (weight-average molecular weight is 150000, degree of dispersion Mw / Mn=2.5), 40 parts by weight of silver powder with a particle diameter of 50nm, 1 part by weight of anti-aging agent Zhuohou B900 / Stir and mix ESC-ES680A, 0.5 parts by weight of anti-ultraviolet agent Tongcai UV-531 and 0.5 parts by weight of leveling agent Wacker WK-9336, and vacuum fill to obtain conductive adhesive.

[0065] 1.2 Spread the conductive adhesive obtained in 1.1 with a radius of 1.5mm on the super soft tinned copper strip solder joint with a width of 5mm and a thickness of 0.25mm, and then lay a width of 7.5mm and a thickness of 7.5mm on the solder joint. 0.2mm polyvinyl chloride tape, positioning and placing 60 monocrystalline silicon MWT cells with an efficiency of 20.1%, heating the conductive adhesive at 120°C for 15s while pressing the cells and ultra-soft tinned copper strips at a pressure of 0.1-5Pa, Connect the cells to get ...

Embodiment 2

[0070] 2.1 The bisphenol A epoxy resin of 50 parts by weight (weight-average molecular weight is 120000, degree of dispersion Mw / Mn=2.5), 48 parts by weight of silver powder with a diameter of 50nm, anti-aging agent DLTP of 1 part by weight, 0.5 parts by weight of anti-aging agent Stir and mix the UV agent HTUV105 and 0.5 parts by weight leveling agent Taiwan Changchun BP-05 / 24 / 26, and vacuum fill to obtain the conductive adhesive.

[0071] 2.2 Spread the conductive adhesive obtained in 2.1 with a radius of 1.5mm on the super soft tinned copper strip solder joints with a width of 5mm and a thickness of 0.25mm, and then lay a width of 7.5mm and a thickness of 7.5mm between the solder joints. 0.2mm polyvinyl chloride tape, positioning and placing 60 pieces of monocrystalline silicon MWT cells with an efficiency of 20.1%, heating the conductive adhesive at 150°C for 10s while pressing the cells and ultra-soft tinned copper strips with a pressure of 0.1-5Pa, Connect the cells to g...

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Abstract

The invention provides a conductive adhesive, a solar cell string and a preparation method of the conductive adhesive. The method comprises the following steps: paving the conductive adhesive on welding spots of a welding strip, and then paving an insulating material between the welding spots; and putting battery pieces, heating the conductive adhesive, and simultaneously pressing the battery pieces and the welding strip, so as to obtain the solar cell string. The conductive adhesive comprises 29-80 parts of a resin base material and 19-71 parts of a conductive filler. Compared with the prior art, by the low-temperature cured conductive adhesive, effective adhesion of the contact point part of the welding strip and the battery is realized; meanwhile, the conductive adhesive has good electrical conductivity; electrical connection of batteries between back-contact batteries is realized; the conductive adhesive is relatively low in curing temperature; and the generated thermal stress is relatively small, so that the bending, cracking and crushing ratios of the solar cell pieces are effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of solar cells, and in particular relates to a conductive adhesive, a solar cell string and a preparation method thereof. Background technique [0002] As the earth's non-renewable resources of oil and gas based on carbon and hydrogen elements are increasingly depleted, solar cells can use their photovoltaic effect to convert solar light into electrical energy, which is environmentally friendly and inexhaustible. An important development direction to replace conventional oil and gas energy. Solar cells can generally be divided into crystalline silicon solar cells, thin film solar cells, dye-sensitized solar cells and organic solar cells. After years of technological progress and relatively mature market promotion, crystalline silicon solar cells are gradually occupying a dominant position in the field of solar energy. [0003] In order to improve the photoelectric conversion efficiency of crystalline silic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01L31/05
CPCY02E10/50
Inventor 倪健雄万志良耿亚飞刘克铭何毅孙仲刚胡志岩
Owner YINGLI ENERGY CHINA
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