How to choose high-temperature adhesive tape suitable for solar energy and new energy field?

The following key factors need to be considered when selecting high-temperature adhesive tapes suitable for the new solar energy field:

First, high temperature resistance

Temperature range matching

First of all, we must make clear the solar energy production process and the temperature range in the use environment. For example, in the diffusion and sintering process of solar cells, the temperature can be as high as 800-1000℃ and 500-800℃. Therefore, it is necessary to choose a tape that can withstand these high temperatures, and its upper temperature limit should be higher than the highest temperature in the actual process and use environment. Generally speaking, for these high-temperature process links, it is recommended to choose high-temperature adhesive tapes with a tolerance temperature above 1000℃ to ensure that they can work normally under extreme high temperatures.

thermostability

Consider the stability of adhesive tape in high temperature environment for a long time. High-quality high-temperature adhesive tape should not appear softening, deformation, aging or material decomposition under continuous high temperature, such as long-term outdoor exposure of solar photovoltaic modules. You can check the technical parameters and related test reports of the product to understand its thermal weight loss rate, dimensional change rate and other indicators under long-term high temperature environment. For example, high-temperature adhesive tapes with low thermal weight loss rate (such as less than 5%) usually have better stability in long-term high-temperature environment.

Second, the viscosity and sealing performance

Viscous materials and strength

According to different materials (such as glass, silicon wafer, metal frame, etc.) in solar panels, it is necessary to choose high-temperature adhesive tapes with suitable adhesive materials. For example, for the glass surface, the adhesive material of the adhesive tape should have good affinity with the glass. For example, the adhesive tape with adhesive components such as silica gel may have better adhesion effect. At the same time, the adhesive strength of the adhesive tape should be considered, and the peeling strength of the adhesive tape should reach a certain standard for the parts that need to be firmly adhered, such as the adhesion between the battery cell and the backplane. Generally, the peeling strength is required to be at least 10N/25mm, so as to ensure that the parts will not fall off easily during transportation, installation and use.

Sealing performance index

Check the sealing performance of high temperature adhesive tape, such as air permeability and moisture permeability. For solar photovoltaic modules, the ideal high-temperature adhesive tape should have low air permeability, such as less than 0.1 cc/m24h, and low moisture permeability, so as to effectively prevent moisture and dust from entering the module. The sealing performance test report of the product can be used to evaluate whether the adhesive tape can meet the sealing requirements of solar module.

Third, the electrical insulation performance

Insulation resistance and breakdown voltage

Choose high temperature adhesive tape with high insulation resistance and sufficient breakdown voltage. In solar panels, in order to prevent short circuit between cells, the insulation resistance of the adhesive tape should be very high, and the insulation resistance is generally required to be greater than 10¹²Ω・cm. The breakdown voltage is also an important index. For the application of solar photovoltaic modules, the breakdown voltage of the adhesive tape should be not less than 10kV/mm to ensure reliable electrical insulation under normal working voltage and possible overvoltage.

Arc resistance

Considering the arc resistance of high temperature adhesive tape. Because solar photovoltaic modules may be subjected to lightning strikes and other situations to generate arcs outdoors, the adhesive tape should be able to withstand certain arc impacts without being damaged. You can check the arc resistance grade of the product, for example, choose a high-temperature adhesive tape with the arc resistance grade of AWM-1 or higher to ensure the electrical safety of the components when the arc is generated.

Fourth, chemical corrosion resistance

Chemical tolerance list

To understand the tolerance of high temperature adhesive tape to chemicals that may be exposed to during the production and use of solar energy. For example, acidic or alkaline cleaning agents will be used in the battery cleaning process, and the adhesive tape should be able to resist the corrosion of these chemicals. Check the product manual or consult the supplier to obtain the list of chemicals that the tape can tolerate, so as to ensure that it can tolerate common chemicals in the solar energy field, such as hydrofluoric acid and sodium hydroxide.

Chemical stability test report

It is required to provide the chemical stability test report of the adhesive tape, including the performance changes after soaking in different chemicals, such as viscosity changes, appearance changes, mechanical properties changes, etc. For example, after soaking in a certain concentration of acidic solution for a certain period of time (such as soaking in 10% hydrofluoric acid solution for 24 hours), the change rate of peeling strength of the tape should be less than 10% to ensure that it can still function normally after contacting with chemicals.

V. Other factors

cost-effectiveness

On the premise of meeting the performance requirements, consider the cost of high temperature adhesive tape. Compare the prices of different brands and models of adhesive tapes, and evaluate the cost-effectiveness by combining their service life, performance stability and other factors. For example, although some imported high-temperature adhesive tapes have excellent performance, their prices are higher; However, some domestic high-quality tapes are more reasonable in price under the condition of similar performance, and can be comprehensively selected according to the actual project budget and performance requirements.

Product certification and quality standards

Select high-temperature adhesive tapes that have passed relevant certifications, such as UL certification (American Underwriters Laboratory Certification) and TUV certification (German Technical Inspection Association Certification). These certifications can prove that the tape meets international or industry standards in terms of safety and quality. At the same time, it is necessary to ensure that the production of adhesive tape conforms to ISO and other quality management system standards, so as to ensure the stability and reliability of product quality.