Monitoring system for measurement of lithium battery cell temperature in electric vehicle based on database and website

Batteries are the main component of electric vehicles because the battery contains electrical energy stored in it. Apart from that, the battery is a source of propulsion energy for electric vehicles. Currently, innovations in developing power systems in electric vehicles are increasingly diverse. Starting from the monitoring system to the Battery Management System (BMS), which makes research on electric vehicle batteries always developed. The research was conducted in the form of a monitoring system in measuring temperature and voltage on the battery using Arduino. The monitoring system usually only uses a serial monitor, but in this study it was made using a database and website pages. Temperature and voltage data is processed by the Arduino microcontroller and sent to the database with the help of NodeMCU V3 and then displayed on the website page. On the test results, the WiFi module successfully sends temperature and voltage data to the database and appears on the website. the data that appears on the serial monitor is the same as the data in the database. then data export can be done in 3 options namely PDF, CSV and TXT. Delay at the time of data transmission is still about 8 seconds. Sending test data using a local network, the website created can't be accessed online.