1. Classification of lithium battery failure
In order to avoid the performance degradation and battery safety problems mentioned above, it is imperative to carry out a failure analysis of lithium batteries. The failure of lithium battery refers to the attenuation of battery performance or abnormal service performance caused by some specific intrinsic reasons, which can be divided into performance failure and safety failure.
Performance failures include capacity diving, cycle life attenuation, abnormal voltage, abnormal current, excessive internal resistance, self-discharge, high and low-temperature aging, poor rate performance, and poor consistency.
Safety failures include thermal runaway, short circuit, fluid leakage, gas bloating, lithium evolution, expansion deformation, puncture (extrusion).
2. Causes of lithium battery failure
The causes of lithium battery failure can be divided into internal and external causes.
Internal causes mainly refer to the nature of physical and chemical changes of failure. The research scale can be traced back to atomic and molecular scales, and the thermodynamic and kinetic changes of the failure process are studied.
External causes include impact, needling, corrosion, high-temperature combustion, human destruction, and other external factors.
3. Analysis of common failure manifestations and failure mechanism of lithium batteries
Volumetric attenuation failure
Internal resistance increases
Internal short circuit
gas and Thermal runaway
Analysis of lithium
