Characterization method for internal reflection optical utilization of photovoltaic module ribbon

Abstract

The invention provides a characterization method for internal reflection optical utilization ratio of a photovoltaic module welding strip. The characterization method comprises the following steps ofS1, testing the same batch of battery pieces under a photovoltaic module standard test environment, and selecting a plurality of battery pieces with similar specifications; S2, fabricating a referencegroup lamination piece welded and laminated by a conventional welding strip and a comparison group lamination piece welded and laminated jointly by the conventional welding strip and a welding stripto be texted; S3, respectively testing short-circuit currents Isc of the reference group lamination piece and the comparison group lamination piece under the same test condition; S4, performing normalization processing on the short-circuit current Isc of the comparison group lamination piece, and drawing a regression curve for linear fitting; and S5, solving internal reflection optical utilizationratio of the welding strip to be tested. By the characterization method for the internal reflection optical utilization ratio of the photovoltaic module welding strip, the internal reflection opticalutilization ratios of different photovoltaic module welding strips can be accurately estimated, and a photovoltaic module manufacturer is convenient to select the photovoltaic module welding strip.

Description

technical field [0001] The invention relates to a characterization method for the optical utilization rate of internal reflection of a photovoltaic module soldering strip, and belongs to the technical field of photovoltaic power generation. Background technique [0002] Since the output power of a single solar cell is very small, the existing photovoltaic modules are usually composed of multiple solar cells connected in series. [0003] Existing crystalline silicon solar cells are connected and packaged to make photovoltaic modules, and the power (actual power) of photovoltaic modules will be less than the sum of the powers of all solar cells (theoretical power), and the difference between theoretical power and actual power The difference is known as the encapsulation power loss of the PV module. Due to the existence of packaging power loss of solar cells, the power loss degree (CTM) of photovoltaic modules is relatively poor. Reflective ribbon for optical utilization to i...

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Problems solved by technology

[0004] However, since there is no clear method to evaluate the utilization rate of internal reflection optics of different types of photovoltaic module ribbons, photovoltaic module manufacturers can only rely on the product information provided by photovoltaic module ribbon manufacturers to select ribbons, so they cannot make a comprehensive analysis of the various photovoltaic module ribbons. The internal reflection optical utilization rate of the ribbon provided by the module ribbon manufacturer is accurately evaluated, so that the optical utilization rate of the photovoltaic module is out of the estimated range

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