Abstract
In order to realize the fire alarm of lithium ion battery, a fire alarm detection device is developed based on the principle of strain measurement. This paper makes a study of the detection principle and application circuit. Firstly, according to characteristic rule of thermal runaway process of lithium ion battery, the correlation between battery deformation, temperature and released gas is analyzed and a battery fire warning method based on strain measurement is proposed. Then, the strain measuring circuit is designed and circuit working principle is analyzed. In the end, the application effect of the battery fire warning method based on strain measurement is verified through thermal runaway experiment of lithium ion battery. The experimental results show that the method based on strain measurement can identify fire risks at the early stage when the lithium ion battery thermal is out of control, preventing fire from spreading. Basically it can meet the needs of lithium-ion battery fire warning.
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