{"id":1804,"date":"2025-09-17T15:32:00","date_gmt":"2025-09-17T07:32:00","guid":{"rendered":"https:\/\/www.bosaenergy.cn\/?p=1804"},"modified":"2025-12-25T15:33:49","modified_gmt":"2025-12-25T07:33:49","slug":"causes-of-abnormal-internal-resistance-of-lithium-ion-batteries","status":"publish","type":"post","link":"https:\/\/www.bosaenergy.cn\/de\/causes-of-abnormal-internal-resistance-of-lithium-ion-batteries\/","title":{"rendered":"Causes of abnormal internal resistance of lithium-ion batteries"},"content":{"rendered":"<p id=\"ember62\">The reasons for abnormal internal resistance of lithium-ion batteries can be analyzed in combination with materials, processes, usage conditions and other aspects:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"ember63\">Material and structural factors<\/h3>\n\n\n\n<p id=\"ember64\"><strong>1. Electrode material issues<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Poor conductivity of the positive and negative electrode active materials or excessive or unevenly distributed binder hinders electron conduction.<\/li>\n\n\n\n<li>Oxidation or poor contact of the copper or aluminum foil current collector increases ohmic internal resistance.<\/li>\n<\/ul>\n\n\n\n<p id=\"ember66\"><strong>2. Abnormal electrolyte<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Insufficient or aged electrolyte (excessive moisture, solvent decomposition) can hinder ion transport.<\/li>\n\n\n\n<li>Excessive electrolyte increases internal resistance and affects lithium ion concentration stability.<\/li>\n<\/ul>\n\n\n\n<p id=\"ember68\"><strong>3. Separator Defects<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Low porosity or excessive thickness of the separator restricts lithium ion migration.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image aligncenter is-resized\"><img decoding=\"async\" src=\"https:\/\/media.licdn.com\/dms\/image\/v2\/D5612AQHI1ldUUUKiyA\/article-inline_image-shrink_400_744\/B56ZlRwPkPKIAY-\/0\/1758013225760?e=1768435200&amp;v=beta&amp;t=dDd6OFYelFPxWkkPTvaSE8B-ApEpczaBNLaL_pFVsIg\" alt=\"\u6587\u7ae0\u5185\u5bb9\" style=\"width:391px;height:auto\"\/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"ember71\">Workmanship and manufacturing defects<\/h3>\n\n\n\n<p id=\"ember72\">1. Electrode and Tab Issues<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Uneven electrode coating thickness, excessive compaction density, or poor tab welding (such as cold welds) can lead to excessive local current density.<\/li>\n\n\n\n<li>High internal resistance between the rivet and the pressure plate, or insufficient positive electrode conductive additive.<\/li>\n<\/ul>\n\n\n\n<p id=\"ember74\">2.Insufficient pre-formation.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The SEI film is not stably formed, and the internal resistance continues to increase during cycling.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"ember76\">Usage and aging factors<\/h3>\n\n\n\n<p id=\"ember77\">1. Overdischarge Impact<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Overdischarge can damage the negative electrode graphite layer, dissolve copper ions in the positive electrode, clog the separator, and increase ohmic internal resistance and charge transfer impedance.<\/li>\n\n\n\n<li>Severe overdischarge can cause SEI film decomposition, further increasing internal resistance.<\/li>\n<\/ul>\n\n\n\n<p id=\"ember79\">2. Temperature and Cycle Loss<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>High temperatures accelerate electrolyte decomposition, while low temperatures reduce ion mobility, both leading to increased internal resistance.<\/li>\n\n\n\n<li>After long-term cycling, the positive electrode material structure collapses, the negative electrode SEI film thickens, and the charge transfer impedance increases.<\/li>\n<\/ul>\n\n\n\n<p id=\"ember81\">3. Poor battery pack consistency<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Variations in capacity or self-discharge rate between battery cells lead to inconsistent voltage and abnormal internal resistance.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"658\" src=\"https:\/\/www.bosaenergy.cn\/wp-content\/uploads\/2025\/12\/image-54-1024x658.png\" alt=\"\" class=\"wp-image-1805\" style=\"width:436px;height:auto\" srcset=\"https:\/\/www.bosaenergy.cn\/wp-content\/uploads\/2025\/12\/image-54-1024x658.png 1024w, https:\/\/www.bosaenergy.cn\/wp-content\/uploads\/2025\/12\/image-54-600x386.png 600w, https:\/\/www.bosaenergy.cn\/wp-content\/uploads\/2025\/12\/image-54-300x193.png 300w, https:\/\/www.bosaenergy.cn\/wp-content\/uploads\/2025\/12\/image-54-768x494.png 768w, https:\/\/www.bosaenergy.cn\/wp-content\/uploads\/2025\/12\/image-54.png 1280w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"ember84\">Other factors<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Micro-short circuits: Metal impurities or diaphragm damage during the production process can cause localized current increase and abnormal internal resistance.<\/li>\n\n\n\n<li>Seal failure: Gas\/liquid leakage after long-term use triggers internal chemical reactions, increasing internal resistance.<\/li>\n<\/ul>\n\n\n\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>The reasons for abnormal internal resistance of lithium-ion batteries can be analyzed in combination with materials, processes, usage conditions and other aspects: Material and structural factors 1. Electrode material issues 2. Abnormal electrolyte 3. Separator Defects Workmanship and manufacturing defects 1. Electrode and Tab Issues 2.Insufficient pre-formation. Usage and aging factors 1. Overdischarge Impact 2. [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1805,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1804","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Causes of abnormal internal resistance of lithium-ion batteries - BOSA lithium battery<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.bosaenergy.cn\/de\/causes-of-abnormal-internal-resistance-of-lithium-ion-batteries\/\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Causes of abnormal internal resistance of lithium-ion batteries - BOSA lithium battery\" \/>\n<meta property=\"og:description\" content=\"The reasons for abnormal internal resistance of lithium-ion batteries can be analyzed in combination with materials, processes, usage conditions and other aspects: Material and structural factors 1. Electrode material issues 2. Abnormal electrolyte 3. Separator Defects Workmanship and manufacturing defects 1. Electrode and Tab Issues 2.Insufficient pre-formation. Usage and aging factors 1. Overdischarge Impact 2. 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