With the continuous improvement of environmental awareness and the gradual implementation of the restriction policy on traditional fuel vehicles, new energy vehicles have gradually become the first choice for people to buy cars. As an energy storage device, the battery pack of new energy vehicles plays a vital role in the drive system of the vehicle, and the safety and stability of the battery directly affects the safety of the vehicle and the safety of the vehicle personnel. The surge in electric car production has also led to a number of serious fire accidents. Such accidents are not limited to small companies, and even giants such as Tata, TESLA and OLA are not immune.

In the production, transportation and storage process of lithium batteries, the detection of temperature is very important. Thermal imager can be used for lithium battery research and development and quality control, storage and other aspects, through rapid and accurate temperature detection, to ensure the safety and quality of lithium battery products.

Customer pain points:

Production link: Lithium battery in high and low temperature aging, charge and discharge test and other production links, at any time may occur thermal runaway problem. In addition, the uneven temperature distribution of the cell directly affects the electrical performance and reliability of the battery pack, which needs to be discovered and eliminated in time.

Transportation and storage link: the electrolyte inside the lithium-ion battery is a flammable liquid, the electrode is a flammable material, the lithium battery in the case of overcharge, short circuit, overheating, puncture or collision occurs thermal control, and fire fast, once the fire occurs, the loss is huge, so the battery storage warehouse temperature online detection, in time to eliminate the risk of fire.

The traditional lithium battery temperature detection method is difficult to ensure the accuracy of detection, and the detection efficiency is low. Part of the thermocouple to detect, thermocouple using contact temperature measurement means, can not quickly locate the highest temperature point, if the positioning error, will cause temperature measurement error, directly affect the battery safety performance analysis and judgment.

Infrared thermal imager has obvious advantages in lithium battery temperature detection:

1. The infrared thermal imager adopts a non-contact temperature measurement method. In the production and quality inspection of lithium batteries, continuous production operations can be achieved while temperature measurement, which improves efficiency and does not affect the battery;

2, real-time temperature display, infrared thermal camera response is rapid, can measure multiple points, can quickly get temperature data, help staff timely understand the comprehensive and complete temperature situation;

3, the infrared thermal imager can set the alarm temperature, draw the temperature thermal image of the battery pack, analyze the health status of the battery pack, and comprehensively detect the fault, so as to achieve early detection and early prevention.

Application points of infrared thermal imager in lithium battery detection:

Lithium battery welding detection

Virtual welding will not only affect the welding strength and conductivity, but also lead to adverse consequences such as increased battery temperature and reduced capacity. The infrared thermal imager can detect whether there is virtual welding in the welding spot of the battery electrode, and can draw the temperature curve of the welding spot in real time, reflecting the temperature rise and fall of each group of cells.

Lithium battery charging and discharging process

The main purpose of lithium-ion battery charge and discharge testing is to evaluate the performance of the battery and determine the service life of the battery under different conditions. Real-time monitoring of battery charging and discharging process by infrared imager can more accurately understand the temperature distribution, hot spots, local overload and other conditions of the battery, which is helpful for design engineers to optimize design and improve battery performance.