{"id":6045,"date":"2023-05-29T09:48:26","date_gmt":"2023-05-29T01:48:26","guid":{"rendered":"https:\/\/www.ray-tron.com\/?p=6045"},"modified":"2023-09-01T14:08:04","modified_gmt":"2023-09-01T06:08:04","slug":"ele5818","status":"publish","type":"post","link":"https:\/\/www.ray-tron.com\/en\/ele5818\/","title":{"rendered":"Design optimization of cylindrical battery tabs"},"content":{"rendered":"<p>The cycling stability of lithium-ion batteries is limited by aging mechanisms at the material, electrode and cell levels. Aging mechanisms include lithium precipitation, solid electrolyte interface growth and binder failure of electrode coatings. Aging can be prevented by ambient temperature control, charging protocols or electrolyte additives. However, cylindrical lithium-ion cells also have an aging mechanism in the form of mechanical deformation inside the coil core after cycling. This internal deformation is usually caused by inhomogeneities.<\/p>\n<p>The tab design of cylindrical batteries can improve this internal unevenness and mechanical deformation of the core. Generally speaking, the plate coating of cylindrical batteries is intermittent, leaving an area on the foil for welding the tabs, and a tape is placed after the tabs are welded. At this time, the thickness of the welded copper or aluminum tab sheet is usually 100-200\u03bcm, which is much higher than the foil thickness (copper: \u224810-15\u03bcm; aluminum: 10-27\u03bcm) and the electrode coating thickness (\u224835-100\u03bcm). The relatively thick tab sheet is welded in the rolled battery cell, which is easy to cause deformation of the rolled battery cell. In addition, the position design of the tab is also critical, which will directly affect the current density distribution and temperature distribution. If the current density or temperature distribution is uneven, it will also cause battery aging and failure.<\/p>\n<figure id=\"attachment_6046\" aria-describedby=\"caption-attachment-6046\" style=\"width: 554px\" class=\"wp-caption alignnone\"><img fetchpriority=\"high\" decoding=\"async\" class=\"size-full wp-image-6046 lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/www.ray-tron.com\/wp-content\/uploads\/2023\/05\/2023052909433824.png\" alt=\"\" width=\"554\" height=\"231\" \/><figcaption id=\"caption-attachment-6046\" class=\"wp-caption-text\"><noscript><img decoding=\"async\" class=\"size-full wp-image-6046 lazyload\" src=\"https:\/\/www.ray-tron.com\/wp-content\/uploads\/2023\/05\/2023052909433824.png\" alt=\"\" width=\"554\" height=\"231\" srcset=\"https:\/\/www.ray-tron.com\/wp-content\/uploads\/2023\/05\/2023052909433824.png 554w, https:\/\/www.ray-tron.com\/wp-content\/uploads\/2023\/05\/2023052909433824-300x125.png 300w\" sizes=\"(max-width: 554px) 100vw, 554px\" \/><\/noscript> (ac) Traditional welding sheet and (d, e) aluminum foil as tab<\/figcaption><\/figure>\n<p>Therefore, the design of the tab needs to consider the following two aspects: (1) Do not introduce a relatively thick tab sheet into the coil core, but leave a protruding foil at one end of the tab as the tab, as shown in Figure 1; (2) Design multiple tabs, and in the extreme case, a full tab, that is, the foil at one end of the tab is completely left blank as the tab. The following takes the 21700 battery as an example to illustrate the effects of these two improvements.<\/p>\n<p>As shown in Figure 2, the welding tabs are designed respectively: 1\u27151 (1 positive tab, 1 negative tab) and 1\u27152 (1 positive tab, 2 negative tabs); aluminum foil tabs: 1\u27151, 1\u27152, 3\u27154 and 101\u2715125 (101 positive tabs, 125 negative tabs, similar to full tabs).<\/p>\n<figure id=\"attachment_6047\" aria-describedby=\"caption-attachment-6047\" style=\"width: 554px\" class=\"wp-caption alignnone\"><img decoding=\"async\" class=\"size-full wp-image-6047 lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"https:\/\/www.ray-tron.com\/wp-content\/uploads\/2023\/05\/2023052909435996.png\" alt=\"\" width=\"554\" height=\"402\" \/><figcaption id=\"caption-attachment-6047\" class=\"wp-caption-text\"><noscript><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-6047 lazyload\" src=\"https:\/\/www.ray-tron.com\/wp-content\/uploads\/2023\/05\/2023052909435996.png\" alt=\"\" width=\"554\" height=\"402\" srcset=\"https:\/\/www.ray-tron.com\/wp-content\/uploads\/2023\/05\/2023052909435996.png 554w, https:\/\/www.ray-tron.com\/wp-content\/uploads\/2023\/05\/2023052909435996-300x218.png 300w\" sizes=\"(max-width: 554px) 100vw, 554px\" \/><\/noscript> Figure 2 Tab design: (a) Definition of tab spacing, (b) Welded tabs: 1\u27151 and 1\u27152, (c) Foil tabs: 1\u27151, 1\u27152, 3\u27154 and 101\u2715125<\/figcaption><\/figure>","protected":false},"excerpt":{"rendered":"<p>The cycling stability of lithium-ion batteries is limited by aging mechanisms at the material, electrode, and cell levels. Aging mechanisms include lithium precipitation, solid electrolyte interface growth, and electrode coating [\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":[253,244],"class_list":["post-6045","post","type-post","status-publish","format-standard","hentry","category-blog","tag-blog","tag-dianchijier"],"_links":{"self":[{"href":"https:\/\/www.ray-tron.com\/en\/wp-json\/wp\/v2\/posts\/6045","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=6045"}],"version-history":[{"count":0,"href":"https:\/\/www.ray-tron.com\/en\/wp-json\/wp\/v2\/posts\/6045\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.ray-tron.com\/en\/wp-json\/wp\/v2\/media?parent=6045"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ray-tron.com\/en\/wp-json\/wp\/v2\/categories?post=6045"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ray-tron.com\/en\/wp-json\/wp\/v2\/tags?post=6045"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}