Thermal runaway early warning system for lithium ion battery of new energy automobile

Abstract

The invention discloses a thermal runaway early warning system for a lithium ion battery of a new energy automobile. The system comprises: an electric signal monitoring unit used for monitoring an electric signal, a temperature monitoring unit used for monitoring a temperature signal, a microprocessor used for sampling and collecting the electric signal and the temperature signal, judging the state of the lithium ion battery and sending out a corresponding control instruction, a controller which is used for receiving the control instruction; and the alarm which is used for giving an alarm. The invention further provides a new energy automobile lithium ion battery thermal runaway early warning method. The thermal runaway early warning system has the beneficial effects that the charging and discharging electric signals and the battery temperature of the lithium ion battery can be monitored, the thermal runaway phenomenon of the lithium battery under different conditions can be judged and identified, early warning can be carried out in time according to the monitoring result, a user can be notified to process in time, and the thermal runaway early warning system is suitable for various new energy automobiles.

Description

technical field [0001] The invention relates to the technical field of new energy vehicles, in particular to a thermal runaway warning system and method for a lithium-ion battery of a new energy vehicle. Background technique [0002] Lithium-ion batteries have developed rapidly since they came out in the 1970s. Because of their advantages such as large specific energy, high output voltage, and long cycle life, they have been widely used in many aspects such as digital and home appliances. In the past 10 years, with the increasingly severe energy problems, lithium-ion batteries have developed rapidly in electric vehicles and electrochemical energy storage. However, lithium-ion batteries themselves have potential safety hazards that cannot be ignored. With the improvement of energy density and other indicators of lithium-ion batteries, the safety issues of lithium-ion batteries have become more and more acute. As of September 2019, there have been more than 40 electric vehicl...

AI Technical Summary

Problems solved by technology

In fact, the triggering of battery failure, fire and explosion also includes harsh external conditions (such as high temperature in the battery box), overcharging and overdischarging of battery cells, battery puncture, etc., which cannot fully realize the actual early warning function. The temperature inside the battery pack is an important factor. Key monitoring points, other monitoring values ​​include battery voltage and current, etc.;

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