The selection of environmental and reliability test chamber shall follow the following five basic principles:   1. Reproducibility of environmental conditions It is out of reach to completely and accurately reproduce the environmental conditions existing in nature in the laboratory. However, within a certain tolerance range, people can accurately and approximately simulate the external environmental conditions experienced …

Purpose of environmental stress screening   The purpose of environmental stress screening is to find and eliminate the early failure of products, make them enter the random failure stage when leaving the factory, and deliver them to users with inherent reliability level.   Principle of environmental stress screening Environmental stress screening is to accelerate the …

Reliability test is an important technical means to evaluate and improve product reliability. It involves the formulation of test scheme, the development of test device, the recording of test process, the establishment of fault analysis technology and so on.   Purpose of Reliability Test   Reliability test is a test to analyze and evaluate the …

Lithium evolution during battery charging and fast charging control   Through the test, it is found that there will be obvious lithium precipitation when the battery is fast charged. Through the study of lithium evolution mechanism, it is found that the complete process of lithium evolution includes lithium precipitation and re embedding on the negative …

High Temperature Stress   Basic parameters of high temperature stress There are two basic parameters of high temperature stress: (1) upper limit temperature (TU); (2) Time (T). In addition, there is another parameter to be considered: ambient temperature (TE), because the variable that really affects the effect of constant high temperature is the difference between …

Thanks to the warm attention of new energy, the power lithium-ion battery industry has also attracted much attention. Power lithium-ion battery is the power source for tools to supply power. It mostly supplies power for electric vehicles, electric bus, electric bicycles and sightseeing car.   Focusing on the thermal runaway of power lithium-ion battery (mainly …

For the ideal lithium-ion battery, the capacity balance will not change in its cycle cycle, and the initial capacity in each cycle should be a certain value. Actually, the situation is much more complex. Any side reaction that can initiate or consume lithium ions may lead to the change of battery capacity balance. This will …

BMS failure mode   The single failure of the battery is not only related to the battery itself, but also related to the failure of the battery management System BMS. BMS failure mode can also cause serious accidents, including the following categories:   BMS voltage test failure causes battery overcharge or over discharge: The voltage …

This paper decomposes studying on the failure mode of power lithium-ion battery system is of great significance to improve the battery life, the safety and reliability of electric vehicles and reduce the service cost of electric vehicles. Various failure modes are considered in the design of power lithium-ion battery system to improve the safety of power lithium-ion …

Power lithium batteries are widely used in new energy vehicles because of their high energy density, high voltage, high specific power, good cycle performance, and no pollution. In order to meet the energy and range required for normal driving, the number of batteries is large, and the single cells are generally arranged in series and …