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A kind of liquid metal conductive glue and its application

A technology of liquid metal and conductive adhesive, applied in the field of solar cells, can solve problems such as high welding temperature of ribbon, lower battery reliability, high solder paste welding temperature, etc., to increase output power, improve reliability, improve production efficiency and finished products rate effect

Active Publication Date: 2021-07-13
YUNNAN KEWEI LIQUID METAL VALLEY R & D CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the soldering ribbon is mainly tin-lead soldering ribbon, which has a high welding temperature and is harmful to the environment, which may easily lead to cracks and fragments of the cell; solder paste not only has a high welding temperature, but also has poor toughness and high thermal stress, which reduces the The reliability of the battery; the main components of the conductive adhesive are matrix resin and metal filler, among which the more mature application is conductive silver adhesive, but because silver is a precious metal, the cost of conductive adhesive is very expensive, which limits its wide application

Method used

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  • A kind of liquid metal conductive glue and its application
  • A kind of liquid metal conductive glue and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Example 1 A liquid metal conductive adhesive for connection of photovoltaic shingled modules

[0058] This embodiment provides a liquid metal conductive adhesive for the connection of photovoltaic shingled components, which is composed of 30% matrix resin and 70% conductive filler by mass ratio; the conductive filler is composed of low melting point metal micronano powder and silver powder mixed, wherein The mass percentage of the low-melting point metal micro-nano powder is 80%, and the mass percentage of the silver powder is 20%.

[0059] Wherein, the matrix resin is composed of resin, curing agent, accelerator, coupling agent, diluent, defoamer, and antioxidant, and its mass-to-number ratio is 100:18:1.2:2:10:0.5:0.2;

[0060] The resin is prepared by mixing bisphenol A epoxy resin, novolak epoxy resin, polyester resin, and aliphatic multifunctional epoxy resin at a mass fraction ratio of 6:1:1:2.

[0061] Among them, the curing agent is methyl T-31 modified amine, ...

Embodiment 2

[0068] Example 2: A connection device for photovoltaic shingled modules

[0069] A connection device for photovoltaic shingled modules, such as figure 2 As shown, it includes: a heating platform 1, an array feeding device 3, a dispensing device 4, a stacking device 6, a closed curing device 7, a bus bar welding device 8, and a heating device 9;

[0070] Wherein, the heating platform is a movable flat plate, which can be placed between the array feeding device, the glue dispensing device, the stacking device, the closed curing device, and the bus bar welding device. Perform reciprocating movement to provide a working platform for each device.

[0071] The heating device is arranged below the heating platform, and the heating device moves together with the heating platform.

[0072] There is a battery substrate on the heating platform 1, which is used to heat and solidify the liquid metal conductive adhesive, so that the shingled battery sheets 2 form a conductive connection;...

Embodiment 3

[0079] Embodiment 3: A connection process using the photovoltaic shingled module described in Embodiment 1

[0080] A connection process for photovoltaic shingled components, such as figure 2 As shown, its technological process includes:

[0081] S1: Photovoltaic shingled cell feed;

[0082] S2: Photovoltaic shingled cell dispensing;

[0083] S3: Photovoltaic shingled cells stacked into strings;

[0084] S4: Curing of photovoltaic shingled battery strings;

[0085] S5: Several battery strings are welded in series and parallel to form photovoltaic shingled modules.

[0086] In the above S1, when the shingled components need to be connected, the shingled battery sheet 2 is transported to the battery substrate of the heating platform 1 through the array feeding device 3;

[0087] In the above S2, use the glue dispensing device 4 to apply liquid metal conductive glue at the welding point 5 on the edge of the battery sheet 2 with a thickness of 2 mm;

[0088] In the above S3...

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Abstract

The invention relates to a liquid metal conductive glue and its application. The liquid metal conductive adhesive is composed of liquid metal, silver powder and matrix resin, wherein the liquid metal accounts for 25%-81% of the total mass of the conductive adhesive, and the silver powder accounts for 5%-45% of the total mass of the conductive adhesive. The amount is base resin. The liquid metal conductive adhesive has the characteristics of low cost, high conductivity, and high bonding strength, and has good wettability to the battery sheets. As a connecting material for shingled components, it can significantly reduce production costs and the contact between shingled battery sheets. Contact resistance; at the same time, due to the low curing temperature of the liquid metal conductive adhesive, the risk of hidden cracks and fragments of the battery sheet caused by high temperature can be reduced; the cured conductive adhesive has good flexibility, which can absorb the thermal stress of the battery sheet and improve Reliability of shingled components. In addition, the use of the conductive adhesive of the present invention can simplify the connection process of the existing shingling technology, and improve the production efficiency and yield of shingling components.

Description

technical field [0001] The invention belongs to the technical field of solar cells, in particular to a conductive adhesive for photovoltaic shingled components and its application. Background technique [0002] A solar cell panel is a device that converts solar radiation energy into electrical energy through the photoelectric effect. It is made by connecting several solar cell sheets on the substrate through welding ribbons. There are gaps between the solar cells on the traditional solar panel, which reduces the effective power generation area of ​​the cells, thereby reducing the power generation efficiency of the solar cell panel. [0003] Shingling technology is a unique connection technology for battery components. It cuts solar cells into small pieces and stacks them end to end along one side of the cells, and then glues them with conductive adhesive to form a battery string. The front of the cell made by this technology is not covered by the solder tape, and at the sam...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J163/00C09J167/00C09J9/02H01L31/048H01L31/05
CPCC08K2003/0806C08K2003/0812C08K2003/085C08K2003/0893C08K2201/011C08L2203/204C08L2205/025C08L2205/035C09J9/02C09J163/00C09J167/00H01L31/0481H01L31/0512C08L63/00C08L67/00C08K3/08Y02E10/50
Inventor 田鹏彭胜金孙燕蔡昌礼邓中山
Owner YUNNAN KEWEI LIQUID METAL VALLEY R & D CO LTD
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