{"id":89,"date":"2009-11-30T15:36:59","date_gmt":"2009-11-30T20:36:59","guid":{"rendered":"http:\/\/blog.hilltech.com\/?p=89"},"modified":"2022-04-06T21:59:10","modified_gmt":"2022-04-07T02:59:10","slug":"ceramic-composite-resistors-provide-a-reliable-solution-for-lithium-ion-battery-pre-charge-circuits","status":"publish","type":"post","link":"https:\/\/blog.hilltech.com\/?p=89","title":{"rendered":"Ceramic composite resistors provide a reliable solution for Lithium-ion battery pre-charge circuits"},"content":{"rendered":"<p>ARLINGTON HEIGHTS, ILLINOIS, USA, Monday, November 30, 2009: Hill Tech Sales, a leader in components for\u00a0Electrical Power Conversion today posted information on Lithium-ion battery pre-charge resistors.<\/p>\n<p>Large scale Lithium-ion battery technologies present a new challenge regarding enormous inrush current requirements when used in Electrical Vehicle (EV) applications. <a href=\"http:\/\/www.hilltech.com\/products\/power_components\/p_resistors_hi.html\">Ceramic composite resistors<\/a> provide a reliable high energy resistor solution for these pre-charge events.<\/p>\n<p>Modern DC converters use input capacitors as part of their power converters\u2019 topology.\u00a0 When used with a Lithium-ion battery, huge inrush currents can occur as the capacitors are charged up to the battery voltage. The inrush becomes extremely difficult to handle when using large batteries with a low source resistance, and substantial capacitance values. Combined with little and\/or no charge on the capacitors, inrush currents peaking over 1000 Amperes can easily occur.<\/p>\n<p>A typical solution is to use a <a href=\"http:\/\/www.hilltech.com\/products\/power_components\/p_resistors_hi.html#u\">high energy resistor<\/a> in a DC pre-charge circuit, to limit inrush current without limiting the operating current. Ceramic composite resistors are made for these applications. Unlike wire wound resistors or metal film resistors where only a metal conductor is absorbing the energy, the composite resistors\u2019 entire mass is absorbing the energy yielding incredibly high impulse energy capacity. Reliability and robustness is also greatly increased since there is no \u201cthin wire\u201d acting as a conducting medium.<\/p>\n<p>Typically a pre-charge resistor is used between a battery and the load to:<\/p>\n<ul>\n<li>Prevent damaging the input capacitors.<\/li>\n<li>Protect battery cells.<\/li>\n<li>Stop the main fuse from blowing during the inrush current event.<\/li>\n<li>Prevent damaging the contactors in the circuit.<\/li>\n<\/ul>\n<p>Sizes of high energy resistors range from a few kilo-joules to <a href=\"http:\/\/www.hilltech.com\/products\/power_components\/p_resistors_hi.html#high_energy\">mega-joules<\/a>.<\/p>\n<p>For more questions on this article contact:<\/p>\n<p>Kurt Neuswanger<br \/>\nHigh Energy Resistor Specialist<br \/>\nHill Technical Sales<br \/>\n216 West Campus Drive<br \/>\nArlington Heights, IL 60004\u00a0\u00a0\u00a0<br \/>\nTel: +1- 847-255-4400\u00a0 ext 11<br \/>\nFax: +1-847-255-0192\u00a0\u00a0\u00a0\u00a0<\/p>\n<p>You may also visit: <a href=\"http:\/\/www.hilltech.com\/\">http:\/\/www.hilltech.com\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Large scale Lithium-ion battery technologies present a new challenge regarding enormous inrush current requirements when used in Electrical Vehicle (EV) applications. Ceramic composite resistors provide a reliable high energy resistor solution for these pre-charge events. <a href=\"https:\/\/blog.hilltech.com\/?p=89\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[180,178],"tags":[193,187,185,189,196,188,194,191,192,186,205,206,204,184],"class_list":["post-89","post","type-post","status-publish","format-standard","hentry","category-learning_center_hill_tech_sales","category-news_hill_tech","tag-bulk-ceramic-resistors","tag-capacitor-charge","tag-capacitor-discharge","tag-carbon-composition-resistor","tag-carborundum","tag-ceramic-resistor","tag-globar","tag-high-power-resistors","tag-high-protection-resistor-surge-voltage","tag-high-voltage-resistors","tag-kanthal","tag-kanthal-888sp-resistor","tag-noninductive-resistors","tag-power-resistors"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Ceramic composite resistors provide a reliable solution for Lithium-ion battery pre-charge circuits -<\/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:\/\/blog.hilltech.com\/?p=89\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ceramic composite resistors provide a reliable solution for Lithium-ion battery pre-charge circuits -\" \/>\n<meta property=\"og:description\" content=\"Large scale Lithium-ion battery technologies present a new challenge regarding enormous inrush current requirements when used in Electrical Vehicle (EV) applications. 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