{"id":7391,"date":"2023-06-21T10:42:06","date_gmt":"2023-06-21T02:42:06","guid":{"rendered":"https:\/\/www.ray-tron.com\/?p=7391"},"modified":"2023-07-21T09:32:37","modified_gmt":"2023-07-21T01:32:37","slug":"alt1125","status":"publish","type":"post","link":"https:\/\/www.ray-tron.com\/en\/alt1125\/","title":{"rendered":"What are the key points of photovoltaic welding ribbon production process"},"content":{"rendered":"

Photovoltaic welding ribbon<\/a>The production of tinned cables combines multiple key technologies such as size, mechanical properties, surface structure, concentricity, tinning process, etc. By disassembling various technical indicators, it can be found that there are many technical points, which are not as low as ordinary wires and cables.<\/p>\n

I. Fine appearance size. The width of the photovoltaic welding ribbon is generally a few millimeters, the thickness of the copper substrate is a fraction of a few millimeters, and the thickness of the single-sided coating is about 5-30\u03bcm, which is a millimeter-level fine product. The appearance size of the welding ribbon not only affects the resistivity of the welding ribbon, but also affects thePhotovoltaic cells<\/a>Create a certain amount of cover.<\/p>\n

II. Mechanical performance requirements. The stress generated by soft solder strips during welding is very small, which can reduce the breakage rate of solar cells, but photovoltaic solder strips that are too soft are easy to break, so technical indicators such as tensile strength, yield strength, and stress level need to be balanced between the optimal critical values to meet the requirements of downstream component manufacturers for welding process technology. Yield strength refers to the limit of metal materials when they yield under the action of external forces. If the limit is greater than this, the metal material will not be able to recover after bending. From a practical application point of view, if the yield strength of the solder strip is less than 58Mpa, the component is prone to displacement when laying the solder strip, resulting in inaccurate welding alignment; if the yield strength is greater than 68MPa, the risk of hidden cracks in the component may increase. Industry leaders control the yield strength of their products between 62-68Mpa.<\/p>\n

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III. Surface structure. The surface structure of the photovoltaic ribbon has a certain impact on the power generation of the module. The photovoltaic module with a planar structure will cause the power loss of the 3% photovoltaic module. If the surface structure of the ribbon is changed by applying the principle of functional total reflection, when the sunlight is incident on the surface of the photovoltaic ribbon, the light will be fully reflected on the surface of the photovoltaic ribbon, which can increase the power generation of the module.Solar Cells<\/a>The total amount of light received by a component.<\/p>\n

IV. Concentration. Concentricity refers to the degree of deviation between the inner diameter of the core and the center of the entire circle, that is, the degree of deviation between the center of the copper wire and the center of the tape. This indicator mainly depends on the uniformity of the coating thickness. The lower the concentricity of the welding strip, the greater the risk of cold welding during module welding, which is prone to hot spot effect during power generation, causing the module to burn. The standard parameter of concentricity is \u226540%, and the concentricity index of the industry leader is controversial.<\/p>\n

IV. Concentration. Concentricity refers to the degree of deviation between the inner diameter of the core and the center of the entire circle, that is, the degree of deviation between the center of the copper wire and the center of the tape. This indicator mainly depends on the uniformity of the coating thickness. The lower the concentricity of the welding strip, the greater the risk of cold welding during module welding, which is prone to hot spot effect during power generation, causing the module to burn. The standard parameter of concentricity is \u226540%, and the concentricity index of industry leaders is controlled above 60%.<\/p>\n

V. Tinning process level and copper substrate thickness of photovoltaic welding strip. The welding section must ensure the firmness of welding. The thickness of the tin layer of the welding section welding strip is required to be about 20\u03bcm to achieve the firmness of copper battery welding. The thickness of the tin layer of the non-welding section is required to be about 5mm to reduce the resistance of the welding strip and improve the conductive efficiency of the welding strip. At the same time, the welding section and the non-welding section must be separated by millimeters. If the tin layer is too thin, it is easy to cause cold soldering. If it is too thick, tin beads or tin piles will be produced, which will affect the appearance of the components and cause a greater risk of hidden cracks in the components. Therefore, a higher technical level is required. The standard parameter of the tin layer thickness is \u00b15\u03bcm, and the thickness of the head office's products is controlled within \u00b13\u03bcm.<\/p>","protected":false},"excerpt":{"rendered":"

The production of photovoltaic welding ribbons combines multiple key technologies such as size, mechanical properties, surface structure, concentricity, tinning process, etc. By disassembling various technical indicators, it can be found that [\u2026]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[19],"tags":[253,227],"class_list":["post-7391","post","type-post","status-publish","format-standard","hentry","category-blog","tag-blog","tag-guangfuhandai"],"_links":{"self":[{"href":"https:\/\/www.ray-tron.com\/en\/wp-json\/wp\/v2\/posts\/7391","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ray-tron.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ray-tron.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ray-tron.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ray-tron.com\/en\/wp-json\/wp\/v2\/comments?post=7391"}],"version-history":[{"count":0,"href":"https:\/\/www.ray-tron.com\/en\/wp-json\/wp\/v2\/posts\/7391\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.ray-tron.com\/en\/wp-json\/wp\/v2\/media?parent=7391"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ray-tron.com\/en\/wp-json\/wp\/v2\/categories?post=7391"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ray-tron.com\/en\/wp-json\/wp\/v2\/tags?post=7391"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}