Lithium battery thermal runaway detection system and method

Abstract

The invention discloses a lithium battery thermal runaway detection system, which comprises a plurality of first temperature sensors, a plurality of voltage sensors, a first pressure sensor, a secondpressure sensor and a controller, wherein the first temperature sensors are respectively and correspondingly arranged on the surface of each battery cell of each battery cell module of a lithium battery so as to detect the first temperature data of each battery cell; the plurality of voltage sensors are respectively and correspondingly arranged on the surface of a high-voltage copper bar of each battery cell of each battery cell module of the lithium battery and are used for detecting voltage data of each battery cell; the first pressure sensor is arranged at a front end plate in the lithium battery shell and is used for acquiring first voltage data; the second pressure sensor is arranged at a rear end plate in the lithium battery shell and is used for acquiring second voltage data; and the control module is connected with the first temperature sensors, the voltage sensors, the first pressure sensor and the second pressure sensor to receive the first temperature data, the voltage data,the first pressure data and the second pressure data transmitted by the sensors, and judge whether thermal runaway happens to the lithium battery or not based on the data. Correspondingly, the invention also discloses a lithium battery thermal runaway detection method which is implemented by the lithium battery thermal runaway detection system.

Description

technical field [0001] The invention relates to a detection system and method, in particular to a thermal runaway detection system and method. Background technique [0002] In recent years, with the rapid development of the automobile industry and the requirements for energy conservation and environmental protection, the market demand for electric vehicles has gradually increased. Different from traditional fuel vehicles, electric vehicles use the electric energy stored in the battery pack as energy, which is energy-saving and environmentally friendly, and has good practical development significance and industrialization prospects. [0003] Since battery packs are very important in electric vehicles, various automobile manufacturers have put forward quite high requirements for the safety of battery packs. Lithium batteries are mainly used in the existing electric vehicle battery packs, and the lithium batteries may experience thermal runaway during use, which poses certain ...

AI Technical Summary

Problems solved by technology

[0005] However, it should be noted that by monitoring the voltage and temperature signals in the BMS for thermal runaway early warning detection means, there may be problems such as excessive temperature, failure of the BMS system, failure to output valid data, and prone to omissions and false alarms. The method also cannot completely record the internal data of the battery pack in the whole process of thermal runaway, which is not conducive to the later optimization of the battery pack design

Correspondingly, due to the lack of air pressure sensor in other test methods, the response speed is slightly slower and the timeliness is delayed

However, the pressure sensor is used to detect the strain of the battery cell for early warning detection, which has a large error and low accuracy.

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