{"id":287674,"date":"2023-06-08T10:06:34","date_gmt":"2023-06-08T10:06:34","guid":{"rendered":"\/forum\/forums\/topic\/failed-curve-fitting-of-hppc-test-data\/"},"modified":"2023-06-08T10:06:34","modified_gmt":"2023-06-08T10:06:34","slug":"failed-curve-fitting-of-hppc-test-data","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/failed-curve-fitting-of-hppc-test-data\/","title":{"rendered":"Failed curve fitting of HPPC test data"},"content":{"rendered":"<p>Hello,<\/p>\n<p>I am trying to simulate a battery pack using MSMD or ECM model. I am using pulse discharge data (HPPC) to estimate the ECM parameters.<\/p>\n<p>I did one pulse discharge test at 25 degree celsius ambient temperature with below stated procedure.<\/p>\n<ul>\n<li class=\"MsoNormal\" style=\"text-indent: 10.5pt\">Charge CC-CV (4.2V, C\/20 cutoff)<\/li>\n<li class=\"MsoNormal\" style=\"text-indent: 10.5pt\">Rest : 30 min<\/li>\n<li class=\"MsoNormal\" style=\"text-indent: 10.5pt\">From 100% to 10% SOC:<\/li>\n<li class=\"MsoNormal\" style=\"text-indent: 10.5pt\">Relaxation&nbsp; of 100 sec.<\/li>\n<li class=\"MsoNormal\" style=\"text-indent: 10.5pt\">Discharge pulse at 1C, (20 sec).<\/li>\n<li class=\"MsoNormal\" style=\"text-indent: 10.5pt\">Rest for 15 mins.<\/li>\n<li class=\"MsoNormal\" style=\"text-indent: 10.5pt\">Discharge at 1C to reduce 10% SOC<\/li>\n<li class=\"MsoNormal\" style=\"text-indent: 10.5pt\">Rest for 30 min.<\/li>\n<li class=\"MsoNormal\" style=\"text-indent: 10.5pt\">Repeat the discharge pulse.<\/li>\n<\/ul>\n<p>I have attached the test data (voltage-time profiles obtained), for this data I am not able to achieve the curve fitting for all the SOC points.<\/p>\n<p>For some SOC points curve fitting is done but for most of the SOC points curve fitting is getting failed.<\/p>\n<p>Below I&nbsp; have attached the voltage-time profiles obtained from the test. <img decoding=\"async\" style=\"font-size: 14pt\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/06\/08-06-2023-1686218721-25_deg_hppc.PNG\" alt=\"\"><\/p>\n<p>Could someone please help me in knowing why curve fitting is failed ?<\/p>\n<p>Is my test procedure correct ? If not could you please suggest the correct testing procedure<\/p>\n<p>Your insights will be of great help for me<\/p>\n<p>Regards<\/p>\n","protected":false},"template":"","class_list":["post-287674","topic","type-topic","status-closed","hentry","topic-tag-ansys-thermal-1","topic-tag-battery","topic-tag-fluent","topic-tag-msmd-battery-model"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["252864","5976"],"_bbp_author_ip":["23.217.200.46"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["896"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["287674"],"_bbp_forum_id":["27792"],"_bbp_engagement":["5976","252864"],"_bbp_voice_count":["2"],"_bbp_reply_count":["1"],"_bbp_last_reply_id":["288510"],"_bbp_last_active_id":["288510"],"_bbp_last_active_time":["2023-06-13 12:31:56"]},"test":"chinmaya-bhaktagreentiger-in"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/287674","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/287674\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=287674"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}