With the rapid development of electric vehicle industry, battery pack as its core component, its performance and safety are increasingly concerned. In order to ensure the stable operation of the battery pack under various extreme environmental conditions, the high and low temperature coolant test machine has become an indispensable test equipment. This paper will discuss the application and importance of high and low temperature coolant testing machine in battery pack.

　　Introduction of high and low temperature coolant testing machine

　　The high and low temperature coolant test machine is a device that simulates the change of ambient temperature, and carries out high and low temperature cycle test on the battery pack by controlling the temperature of the coolant. This test method can effectively simulate the working condition of the battery pack under extreme environment, so as to evaluate the performance and safety of the battery pack.

　　Second, the importance of battery pack performance testing

　　As the power source of electric vehicles, the performance of the battery pack is directly related to the vehicle's driving range, power output and service life. In addition, the battery pack in high temperature or even above 60 ° C or low temperature such as -40 ° C below the extreme environment, there may be performance attenuation, thermal runaway and other safety hazards. Therefore, it is particularly important to test the performance of the battery pack at high and low temperatures.

　　Third, the application of high and low temperature coolant testing machine in battery packs

　　Temperature cycle test: The temperature cycle test of the battery pack is carried out by the high and low temperature coolant test machine to simulate the temperature change that the battery pack may encounter in the actual use process. This testing helps to identify potential problems with the battery pack under extreme temperature conditions and provides a basis for improved design.

　　Performance test: In a high and low temperature environment, the battery pack's charge and discharge performance, internal resistance, capacity and other key parameters are tested. Through these data, we can evaluate the performance of the battery pack under different temperature conditions, and provide a basis for formulating appropriate use strategies.

　　Safety assessment: The use of high and low temperature coolant test machine to simulate the working condition of the battery pack in extreme environments to observe whether the battery pack has thermal runaway, leakage and other safety hazards. This helps ensure the safe use of the battery pack in a variety of environments.

　　Iv. Practical cases and effect analysis

　　An electric vehicle manufacturer has introduced a high and low temperature coolant tester to test battery packs during production. Through a series of experiments, they found that:

　　In the high temperature environment, the charge and discharge performance of some battery packs decreased significantly, the internal resistance increased, and the capacity decreased. In response to this problem, the manufacturer has optimized the thermal management system of the battery pack to improve the heat dissipation performance, which improves the performance in high temperature environments.

　　At low temperatures, the charging speed of the battery pack is slowed down and the discharge performance is limited. In order to solve this problem, the manufacturer has improved the insulation material of the battery pack to improve the charging efficiency and discharge performance in low temperature environment.

　　Through the high and low temperature cycle testing, the manufacturer also found some potential safety hazards, such as the thermal runaway phenomenon of individual battery packs at extreme temperatures. In response to these problems, the manufacturer has taken timely measures to improve and ensure the safety of the battery pack.

　　Through the application and practice of high and low temperature coolant testing machines, the electric vehicle manufacturer has successfully improved the performance and safety of battery packs in various environments, providing more reliable products to the market.

　　V. Conclusion and prospect

　　The application and practice of high and low temperature coolant testing machine in battery pack is of great significance. The performance and safety of the battery pack can be evaluated effectively by testing the performance of the battery pack at high and low temperature, which provides a basis for improving the design and formulating the appropriate use strategy. With the continuous progress of technology and the continuous growth of market demand, the future high and low temperature coolant tester will play a more important role in the electric vehicle industry, contributing to the sustainable development of the electric vehicle industry.