Water-based flux for photovoltaic n-type cell 0bb module and preparation method thereof

Abstract

The application discloses a water-based type flux for a photovoltaic N-type cell 0BB assembly and a preparation method thereof, and belongs to the technical field of fluxes. The flux is prepared from the following raw materials in parts by weight: deionized water 30-60 parts, an alcohol solvent 30-50 parts, a high-boiling-point solvent 2-8 parts, an organic acid 1-4 parts, a surfactant 0.1-1 part, an antioxidant 0.1-1 part, a corrosion inhibitor 0.1-1 part, allulose 0-1 part and trimethylolpropane trioctanoate 0-1 part. The application solves the problem of the negative influence of the traditional flux applied in the photovoltaic N-type cell 0BB assembly on the tensile force of the heat-resistant glue and the alloying of the fine grid.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fluxes, more particularly to a water-based flux for N-type photovoltaic cell 0BB modules and a preparation method thereof. BACKGROUND

[0002] With the continuous development of photovoltaic cell technology, N-type TOPCon technology and HJT technology have emerged as the times require, and N-type modules are constantly replacing PERC modules. In recent years, with the sharp rise in international silver prices, photovoltaic cells and modules have brought unprecedented cost anxiety, and in order to reduce the manufacturing cost of the module end, major module manufacturers have successively launched N-type 0BB module products. So-called 0BB is a cell without a main grid, and is a fine grid, which reduces the amount of silver paste used and increases the current collection, but at the same time brings greater challenges to welding. The traditional module welding process cannot match the 0BB module process, which brings great challenges to auxiliary materials and equipment manufacturers involved in the welding process, especially flux manufacturers.

[0003] The existing flux is mostly alcohol-based, using some low-boiling-point alcohol as a solvent to match flux activators, additives, etc. to make. This type of flux has been applied to the welding process of conventional modules. Due to the low boiling point and fast evaporation of this type of flux, crystallization occurs quickly and there is a lot of crystallization, which increases the acid content and affects the curing rate of the heat-set adhesive; especially in the 0BB module welding process, it easily affects the dispensing process of the heat-set adhesive, resulting in low tension of the heat-set adhesive on the fine grid of the cell, and the flux has poor alloying effect on the fine grid of the cell, which is prone to false welding. The traditional alcohol-based flux has a great impact on the welding process of 0BB modules. SUMMARY

[0004] The present application aims to overcome the shortcomings of the prior art and provide a water-based flux for N-type photovoltaic cell 0BB modules and a preparation method thereof.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0006] A water-based flux for N-type photovoltaic cell 0BB modules is made from the following raw materials by weight: deionized water 30-60 parts, alcohol solvent 30-50 parts, high-boiling-point solvent 2-8 parts, organic acid 1-4 parts, surfactant 0.1-1 part, antioxidant 0.1-1 part, corrosion inhibitor 0.1-1 part, allulose 0-1 part, and trimethylolpropane trioctanoate 0-1 part.

[0007] The present application further provides that the alcohol solvent is isopropyl alcohol.

[0008] The high-boiling point solvent is at least one of diethylene glycol butyl ether, tripropylene glycol butyl ether, propylene glycol methyl ether, ethylene glycol dimethyl ether, and ethylene glycol butyl ether.

[0009] The organic acid is at least one of acetic acid, malic acid, malonic acid, citric acid, glutaric acid, and tartaric acid.

[0010] The surfactant is at least one of abietinol ether surfactant, alkyl glycoside, and OP-10.

[0011] The antioxidant is at least one of ascorbic acid and 2,4,6-tris(dimethylaminomethyl)phenol.

[0012] The corrosion inhibitor is at least one of triethanolamine and benzotriazole.

[0013] The preparation method comprises the following steps: adding deionized water, an alcohol solvent, a high-boiling point solvent, an organic acid, a surfactant, an antioxidant, and a corrosion inhibitor into a stirring container in a proportion, and then stirring and mixing.

[0014] The preparation method comprises the following steps: adding deionized water, an alcohol solvent, a high-boiling point solvent, an organic acid, a surfactant, an antioxidant, and a corrosion inhibitor into a stirring container in a proportion, and then stirring and mixing.

[0015] A preparation method of a water-based type flux for a photovoltaic N-type cell 0BB assembly, which comprises the following steps: adding deionized water, an alcohol solvent, a high-boiling point solvent, an organic acid, a surfactant, an antioxidant, and a corrosion inhibitor into a stirring container in a proportion, and then stirring and mixing.

[0016] In summary, the present application has the following beneficial effects:

[0017] The water-based type flux prepared by the compatibility design of the alcohol solvent, the high-boiling point solvent, the organic acid, the surfactant, the antioxidant, and the corrosion inhibitor can be applied to the welding process of the photovoltaic N-type cell 0BB assembly, and solves the influence of the traditional flux on the tensile force of the heat-resistant glue and the alloying of the fine grid in the 0BB assembly. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0019] The water-based flux for the photovoltaic N-type cell 0BB assembly is prepared from raw materials including the following components by weight: deionized water 30-60 parts, alcohol solvent 30-50 parts, high-boiling-point solvent 2-8 parts, organic acid 1-4 parts, surfactant 0.1-1 part, antioxidant 0.1-1 part, corrosion inhibitor 0.1-1 part, allulose 0-1 part, and trimethylolpropane trioctanoate 0-1 part. The alcohol solvent is isopropyl alcohol; the high-boiling-point solvent is at least one of diethylene glycol butyl ether, tripropylene glycol butyl ether, propylene glycol methyl ether, ethylene glycol dimethyl ether, and ethylene glycol butyl ether; the organic acid is at least one of acetic acid, malic acid, malonic acid, citric acid, glutaric acid, and tartaric acid; the surfactant is at least one of rosin alcohol ether surfactant, alkyl glycoside, and OP-10; the antioxidant is at least one of ascorbic acid and 2,4,6-tris(dimethylaminomethyl)phenol; and the corrosion inhibitor is at least one of triethanolamine and benzotriazole.

[0020] At room temperature, the deionized water, alcohol solvent, high-boiling-point solvent, organic acid, surfactant, antioxidant, and corrosion inhibitor are sequentially added to a stirring container in proportion, and allulose and trimethylolpropane trioctanoate are added or not added, and then stirred and mixed uniformly to obtain the water-based flux for the photovoltaic N-type cell 0BB assembly.

[0021] Comparative Example 1

[0022] At room temperature, 1.9 parts by mass of organic acid (a mixture of malic acid, citric acid, glutaric acid, and malonic acid at a mass ratio of 1:1:1:1:1), 0.1 part by mass of fluorocarbon surfactant, 0.1 part by mass of ascorbic acid, 3 parts by mass of tripropylene glycol butyl ether, and 94.9 parts by mass of isopropyl alcohol are mixed and stirred uniformly at room temperature to obtain the alcohol-based no-clean flux.

[0023] Example 1

[0024] At room temperature, 44.5 parts by mass of deionized water, 50 parts by mass of isopropyl alcohol, 3 parts by mass of diethylene glycol butyl ether, 2 parts by mass of organic acid (a mixture of acetic acid, malic acid, malonic acid, citric acid, and glutaric acid at a mass ratio of 1:1:1:1:1), 0.3 parts by mass of surfactant OP-10, 0.1 part by mass of ascorbic acid, and 0.1 part by mass of benzotriazole corrosion inhibitor are sequentially added to a stirring container in proportion and stirred and mixed uniformly to obtain the water-based flux for the photovoltaic N-type cell 0BB assembly.

[0025] Example 2

[0026] At room temperature, 45.95 parts by mass of deionized water, 48 parts by mass of isopropyl alcohol, 3 parts by mass of diethylene glycol butyl ether, 2.5 parts by mass of organic acid (mixed by acetic acid, malic acid, malonic acid, citric acid, glutaric acid in a mass ratio of 1:1:1:1:1), 0.35 parts by mass of surfactant OP-10, 0.1 parts by mass of ascorbic acid, 0.1 parts by mass of benzotriazole were sequentially added into a stirring container in proportion and stirred to mix uniformly, to obtain a water-based flux for photovoltaic N-type battery 0BB assembly.

[0027] Example 3

[0028] At room temperature, 48.9 parts by mass of deionized water, 45 parts by mass of isopropyl alcohol, 3.5 parts by mass of diethylene glycol butyl ether, 2 parts by mass of organic acid (mixed by acetic acid, malic acid, malonic acid, citric acid, glutaric acid in a mass ratio of 1:1:1:1:1), 0.35 parts by mass of surfactant OP-10, 0.1 parts by mass of ascorbic acid, 0.15 parts by mass of benzotriazole were sequentially added into a stirring container in proportion and stirred to mix uniformly, to obtain a water-based flux for photovoltaic N-type battery 0BB assembly.

[0029] Example 4

[0030] At room temperature, 49 parts by mass of deionized water, 45 parts by mass of isopropyl alcohol, 3 parts by mass of diethylene glycol butyl ether, 2.5 parts by mass of organic acid (mixed by acetic acid, malic acid, malonic acid, citric acid, glutaric acid in a mass ratio of 1:1:1:1:1), 0.3 parts by mass of surfactant OP-10, 0.1 parts by mass of ascorbic acid, 0.1 parts by mass of benzotriazole were sequentially added into a stirring container in proportion and stirred to mix uniformly, to obtain a water-based flux for photovoltaic N-type battery 0BB assembly.

[0031] At room temperature, the water-based fluxes of Example 1-Example 4 and Comparative Example 1 were applied to solder the cell piece fine grid and PAD point in the photovoltaic N-type battery 0BB assembly. The specific test results are shown in Table 1 (a horizontal tensile tester was used to cooperate with a "cell piece soldering tensile test fixture" to test the cell piece at multiple angles, and the tensile force was measured; the specific method is as follows: adjust the 90° angle on the cell piece soldering tensile platform, then hook the soldered solder strip, connect the hook with the horizontal tensile test, then pull forward at a uniform speed until a complete tensile force value appears on the tensile tester; record the tensile force value, do three parallel experiments, and calculate the average tensile force).

[0032] Table 1

[0033]

[0034] Example 5

[0035] At room temperature, 48.5 parts by mass of deionized water, 45 parts by mass of isopropyl alcohol, 3 parts by mass of diethylene glycol butyl ether, 2.5 parts by mass of organic acid (mixed by acetic acid, malic acid, malonic acid, citric acid, glutaric acid in a mass ratio of 1:1:1:1:1), 0.3 parts by mass of surfactant OP-10, 0.1 parts by mass of ascorbic acid, 0.1 parts by mass of benzotriazole, 0.5 parts by mass of allulose are added into a stirring container in proportion and stirred uniformly to obtain a water-based flux for photovoltaic N-type battery 0BB assembly.

[0036] Example 6

[0037] At room temperature, 48.5 parts by mass of deionized water, 45 parts by mass of isopropyl alcohol, 3 parts by mass of diethylene glycol butyl ether, 2.5 parts by mass of organic acid (mixed by acetic acid, malic acid, malonic acid, citric acid, glutaric acid in a mass ratio of 1:1:1:1:1), 0.3 parts by mass of surfactant OP-10, 0.1 parts by mass of ascorbic acid, 0.1 parts by mass of benzotriazole, 0.5 parts by mass of allulose are added into a stirring container in proportion and stirred uniformly to obtain a water-based flux for photovoltaic N-type battery 0BB assembly.

[0038] Example 7

[0039] At room temperature, 48.5 parts by mass of deionized water, 45 parts by mass of isopropyl alcohol, 3 parts by mass of diethylene glycol butyl ether, 2.5 parts by mass of organic acid (mixed by acetic acid, malic acid, malonic acid, citric acid, glutaric acid in a mass ratio of 1:1:1:1:1), 0.3 parts by mass of surfactant OP-10, 0.1 parts by mass of ascorbic acid, 0.1 parts by mass of benzotriazole, 0.5 parts by mass of allulose are added into a stirring container in proportion and stirred uniformly to obtain a water-based flux for photovoltaic N-type battery 0BB assembly.

[0040] At room temperature, the water-based fluxes of example 5 to example 7 are applied to the welding of cell piece fine grid and PAD point in photovoltaic N-type battery 0BB assembly respectively. After performance test, it is found that the front glue point tension, the back glue point tension, the front and back qualified rate, the alloy ratio and the assembly A level yield rate of the water-based fluxes of example 5 to example 7 are higher than those of example 1 to example 4, and the corresponding 0BB glue point front glue point tension (0.48N), 0BB glue point back glue point tension (0.42N), PAD point alloy tension (1.42N), front and back qualified rate (99.61%), alloy ratio (99.74%), assembly A level yield rate (99.85%) of example 7 are the highest.

[0041] The photovoltaic N-type cell 0BB assembly welded by the water-based fluxes of examples 4-7 was placed in 85℃, 90% humidity condition for aging, and it was found that the photovoltaic N-type cell 0BB assembly welded by the water-based fluxes of examples 4-7 produced black spots, yellow spots after 96h, 161h, 100h, 283h of aging, respectively.

[0042] The water-based flux for photovoltaic N-type cell 0BB assembly provided by the application can be applied to the welding of solder strips and cell pieces. According to the data in Tables 1 and 2, the water-based fluxes provided by the examples of the application all meet the performance requirements (0BB glue point tension > 0.3N, cell PAD point alloy tension > 1N, front and back surface qualified rate > 95%, alloy ratio > 95%, and assembly A-grade product rate > 99.5%). The 0BB glue point tension of the traditional alcohol-based flux (comparative example 1) is low (<0.1N), the front and back surface qualified rate is low (<50%), the assembly A-grade product rate is low (<40%), and the performance is far inferior to that of the examples of the application.

[0043] The above only describes the preferred embodiments of the application, and the protection scope of the application is not limited to the above-described examples. Any technical solution falling within the concept of the application belongs to the protection scope of the application. It should be noted that, for ordinary skilled persons in the art, some improvements and refinements without departing from the principles of the application are also considered to be within the protection scope of the application.

Claims

1. A water-based flux for a photovoltaic N-type cell OBB module, characterized in that, It is made from the following raw materials in parts by weight: 49 parts deionized water, 45 parts alcohol solvent, 3 parts high boiling point solvent, 2.5 parts organic acid, 0.3 parts surfactant, 0.1 parts antioxidant, 0.1 parts corrosion inhibitor, 0.5 parts allulose, and 0.5 parts trimethylolpropane trioctyl ester.

2. The water-based flux for a photovoltaic N-type cell OBB module according to claim 1, characterized in that, The alcohol solvent is isopropanol.

3. The water-based flux for a photovoltaic N-type cell OBB module according to claim 1, characterized in that, The high-boiling-point solvent is at least one of diethylene glycol butyl ether, tripropylene glycol butyl ether, propylene glycol methyl ether, ethylene glycol dimethyl ether, and ethylene glycol butyl ether.

4. The water-based flux for a photovoltaic N-type cell OBB module according to claim 1, characterized in that, The organic acid is at least one of acetic acid, malic acid, malonic acid, citric acid, glutaric acid, and tartaric acid.

5. The water-based flux for a photovoltaic N-type cell OBB module according to claim 1, characterized in that, The surfactant is at least one of rosin alcohol ether surfactant, alkyl glycoside, and OP-10.

6. The water-based flux for a photovoltaic N-type cell OBB module according to claim 1, characterized in that, The antioxidant is at least one of ascorbic acid and 2,4,6-tris(dimethylaminomethyl)phenol.

7. The water-based flux for a photovoltaic N-type cell OBB module according to claim 1, characterized in that, The corrosion inhibitor is at least one of triethanolamine and benzotriazole.

8. A method for preparing a water-based flux for a photovoltaic N-type cell OBB module according to any one of claims 1-7, characterized in that, Deionized water, alcohol solvent, high-boiling-point solvent, organic acid, surfactant, antioxidant, and corrosion inhibitor are added to a mixing container in the following proportions. Allulose and trimethylolpropane trioctyl ester are then added and stirred until well mixed to obtain the water-based flux for photovoltaic N-type cell OBB modules.

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