Abstract: The safety accident of lithium-ion battery system frequently occurred,however the gas detection in most electrochemical battery energy storage systems is lacking.A gas detection and warning device in power battery energy storage system based on single chip microcomputer STM32F103 was proposed.And MQ series gas sensors were used to detect the concentration of harmful gases that may be released by lithium ion batteries.The internal ADC of the single-chip microcomputer was used to realize analog-digital conversion and set relevant thresholds in conjunction with the acousto-optic alarm circuit to realize acousto-optic alarm,so as to effectively detect the occurrence of gas emission warning accidents.

Key words: lithium batteries, MCU, gas detection, MQ sensor