How to detect the maximum failure temperature of a lithium battery

The “4th World Internet Conference” was grandly opened in Wuzhen and showcased a number of cutting-edge technologies and innovations in the development of the Internet in China and the world. New energy vehicles and smart unmanned vehicles are among the audience’s focus. With the rapid development of the automotive industry, new energy vehicles and autonomous driving technologies have gradually been accepted by the public. However, how to solve the safety problems caused by batteries has become a new topic and difficulty in the automotive industry. Lithium battery is an important component of a car. Its performance directly determines whether the end user is satisfied. Therefore, the failure of a lithium battery is tested in all directions, and a safe and reliable lithium battery is provided, whether it is a new energy car or an intelligent driverless car. It is particularly important.

So how to test all-round lithium battery failure? A domestic vehicle inspection and testing institute to test the failure of automotive lithium batteries is to install lithium batteries on a hot plate, and then perform charge and discharge experiments. Usually the battery will fail when heated to more than 100 degrees. Some batteries will spray gas and liquids outward; some will burn and fire; some may even explode. Therefore, in the test process, the quick and intuitive detection of the maximum temperature of the battery is the most important thing.

So how can we quickly and intuitively check the battery's maximum temperature? This has become a major problem for the Institute of Vehicle Inspection. The current test method of the Institute is to use a thermocouple to check the temperature of the battery, but there is only one sample point, so the temperature value detected by the thermocouple is not necessarily the highest value of the battery. High-density multiple sampling is required to estimate the highest failure temperature of the battery, which has caused great difficulties for the test.

Testers use the FLIR A655sc thermal imaging camera on site for testing

So how can we quickly, intuitively and accurately detect the maximum failure temperature of lithium batteries? The Vehicle Inspection Institute tried using the FLIR A655sc infrared thermal imager instead of the traditional thermocouple to perform a lithium battery failure test. The results achieved unexpected results, allowing testers to quickly, intuitively, and accurately determine the battery. The highest temperature point avoids the trouble of using a thermocouple to detect the highest failure temperature of a lithium battery for multiple sampling.

So how does the FLIR A655sc thermal imaging camera detect the highest failure temperature of a lithium battery quickly and accurately? This is due to the powerful performance of the A655sc. A655sc built-in uncooled detector with focal plane array window for high-speed imaging at 200 Hz, easy integration with GenICam and GigE vision protocols, real-time reading and display of temperature values, and automatic tracking and capture of the highest in the analysis area The temperature point allows the staff to quickly, intuitively and accurately find the maximum failure temperature of the lithium battery through the infrared thermal image.

Compared to traditional thermocouples, the use of the FLIR A655sc thermal imaging camera to test the failure performance of automotive lithium batteries is undoubtedly the right choice.