Isolating bar for photovoltaic module and production method thereof

Abstract

The invention provides an isolating bar for a photovoltaic module. The isolating bar is characterized in that from top to bottom, a first layer is a modified PE / EVA (Polyethylene / Ethylene Vinyl Acetate) layer, a second layer is an EVA glue layer, a third layer is a PET (Polyethylene Terephthalate) layer, a fourth layer is an EVA glue layer and a fifth layer is a modified PMMA / EVA (Polymethyl Methacrylate / Ethylene Vinyl Acetate) layer. By adopting the technical scheme, firstly, the modified PE / EVA layer is used as the first layer; in a utilization process, the first layer is directly exposed under sunlight; PE has a certain anti-UV (Ultraviolet) capability so that the modified PE / EVA layer also provides protection for other layers. The modified PMMA / EVA layer is used as a final layer; PMMAhas a relatively strong anti-UV capability, so that the anti-UV effect of the whole isolating bar is also effectively enhanced. A whole production method of the isolating bar is relatively simple andthe isolating bar is subjected to UV curing and ozone treatment for a plurality of times, so that the production efficiency is accelerated and the stability of later utilization is improved, and furthermore, the isolating bar is suitable for being popularized in a large range.

Description

technical field [0001] The invention relates to the field of photovoltaics, in particular to a spacer for photovoltaic modules and a production method thereof. Background technique [0002] Energy and environment are two basic issues facing mankind in the 21st century. The development of pollution-free and renewable new energy is the only way to solve these two problems. At present, the proportion of photovoltaic power generation in energy is very small, and the high cost is the main obstacle restricting the large-scale application of photovoltaic power generation. It has become a top priority to develop a new generation of high-efficiency, low-cost solar cell modules, so that the cost of power generation can be close to or even lower than that of conventional energy sources. [0003] At present, in the solar cell packaging, the positive and negative poles of the battery need to use a spacer to insulate the positive and negative poles at the bus bar at the edge of the modu...

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Problems solved by technology

[0003] At present, in the solar cell packaging, the positive and negative poles of the battery need to use a spacer to insulate the positive and negative poles at the bus bar at the edge of the module. This spacer needs to have good electrical insulation and stability (UV aging resistance), and at the same time It needs to be able to maintain long-term stable bonding with EVA (vinyl acetate copolymer), battery sheets, and soldering strips. At present, EVA and backplane materials are usually used to isolate module bus bars. The operation steps when placing the isolation bars are complicated, resulting in production efficiency. Reduced and increased manufacturing costs

Moreover, there are two types of isolation strips commonly used in the market: the backplane material type and the EVA type isolation strip. The cost of the backplane material isolation strip is too high, and the EVA type isolation strip has poor UV resistance.

[0004] At the same time, solar photovoltaic cell modules need to absorb sunlight outdoors. Under long-term ultraviolet radiation, the photoelectric conversion efficiency of solar photovoltaic cell modules will drop rapidly. Existing components have poor UV resistance, thus losing their practical value. Therefore, it is necessary for the spacer to have a strong resistance to ultraviolet radiation.

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