{"id":5845,"date":"2023-05-06T17:05:10","date_gmt":"2023-05-06T09:05:10","guid":{"rendered":"https:\/\/www.ray-tron.com\/?p=5845"},"modified":"2023-09-01T14:00:34","modified_gmt":"2023-09-01T06:00:34","slug":"ele5767","status":"publish","type":"post","link":"https:\/\/www.ray-tron.com\/en\/ele5767\/","title":{"rendered":"Black photovoltaic ribbon process"},"content":{"rendered":"

Photovoltaic welding ribbon<\/a>The tin coating process includes the following steps:<\/p>\n

(1) Substrate selection: oxygen-free copper strip is selected as the substrate, and the oxygen-free copper strip is a double-plane welding strip or a heterogeneous copper strip;<\/p>\n

(2) Electroplating: The selected substrate is placed in a silver plating solution, a tin-lead alloy or a pure tin plating solution for electroplating. The thickness of the plated alloy layer is 0 to 8 \u03bcm, i.e., the bottom solderable layer;<\/p>\n

(3) Coating and printing of solder paste: The substrate with the bottom solderable layer electroplated in step (2) is coated and printed with solder paste. The specific process is as follows:<\/p>\n

Preparation of solder paste: Select solder paste with a particle size of 4 to 6 and a viscosity range of 150\u00b15%Pa.s or 190\u00b15%Pa.s for standby use;<\/p>\n

Applying solder paste layer: Apply the prepared solder paste on the electroplated substrate surface by roller, printing, spraying or pad printing; forming a solder paste layer of 20\u03bcm to 50\u03bcm, that is, forming a solderable layer;<\/p>\n

In the process steps of black photovoltaic welding strip: for the substrate with embossing, the shape of the solder paste coating is required to be consistent with the substrate plane and cannot be in the groove; for the substrate with oblique V-groove, the solder paste coating is required to be consistent with the non-beveled substrate plane and cannot be on the bevel; for the double-plane welding strip, the solder paste coating is required to form a regular pattern on the substrate plane, with no limit on the shape, and the area occupied accounts for 30% to 60% of the plane part;<\/p>\n

Preparation of solder joints: The substrate coated with solder paste in step (3) is heated and melted by a high-temperature furnace or hot air, and the heating peak is maintained at 160\u00b0C to 230\u00b0C. After 15s to 20s, a solder joint with a thickness of 10\u03bcm to 25\u03bcm is formed in the plane area, and the entire tin coating process is completed.<\/p>\n

Preferably, in the electroplating process of step (2), the specific tin coating process is:<\/p>\n

placing the selected substrate in a silver plating solution, a tin-lead alloy plating solution or a pure tin plating solution;<\/p>\n

Tin or tin-lead plating, at a temperature of 30\u00b0C and a current density of 20ASD to 26ASD, for 60s to 90s;<\/p>\n

The substrate surface is covered with a dense tin or tin-lead alloy coating with a coating thickness of 0 to 8 \u03bcm and a bright surface;<\/p>\n

After electroplating, clean and dry the soldering strip for later use.<\/p>\n

Preferably, in step (2), a bright silver coating is electroplated on the surface of the substrate, and the coating thickness is 1 \u03bcm to 4 \u03bcm.<\/p>\n

Preferably, in step (3), the solder paste is selected from: tin-lead solder paste, tin-silver-copper solder paste, tin-bismuth-silver solder paste or tin-bismuth solder paste. And the components thereof are respectively as follows in terms of mass percentage:<\/p>\n

The components of the tin-silver-copper solder paste are Sn3Ag0.5Cu in terms of mass percentage;<\/p>\n

Preferably, the components of the tin-bismuth-silver solder paste are Sn35Bi1Ag in terms of mass percentage;<\/p>\n

Preferably, the components of the tin-bismuth solder paste are Sn37Pb in terms of mass percentage, wherein Sn is the remainder.<\/p>","protected":false},"excerpt":{"rendered":"

The tinning process of photovoltaic welding strip includes the following steps: (1) Substrate selection: oxygen-free copper strip is selected as the substrate, and the oxygen-free copper strip is a double-plane welding strip or a heterogeneous copper strip [\u2026]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","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":"default","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":[253,234],"class_list":["post-5845","post","type-post","status-publish","format-standard","hentry","category-blog","tag-blog","tag-heisehuiliudai"],"_links":{"self":[{"href":"https:\/\/www.ray-tron.com\/en\/wp-json\/wp\/v2\/posts\/5845","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=5845"}],"version-history":[{"count":0,"href":"https:\/\/www.ray-tron.com\/en\/wp-json\/wp\/v2\/posts\/5845\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.ray-tron.com\/en\/wp-json\/wp\/v2\/media?parent=5845"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ray-tron.com\/en\/wp-json\/wp\/v2\/categories?post=5845"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ray-tron.com\/en\/wp-json\/wp\/v2\/tags?post=5845"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}