In the context of energy crisis and environmental pollution, lithium-ion batteries are receiving more and more attention as an ideal energy source for development in the 21st century. However, lithium-ion batteries are subject to certain failures in the process of production, transportation and use. And after the failure of a single battery will affect the performance and reliability of the entire battery pack, or even cause the battery pack to stop working or other safety issues.
Lithium-ion batteries have become the standard power source for portable mobile devices and are growing rapidly in the electric vehicle and energy storage markets. The requirements for battery safety, energy density, power density, reliability and cycle life are also increasing, and lithium-ion battery performance is affected by numerous factors, and even a small amount of impurities can adversely affect the cycle stability and safety of lithium-ion batteries. Therefore, we must pay great attention to the production process and strictly control the quality.
Factors affecting the safety of lithium-ion batteries
1、Receiving a violent impact or puncture, which will immediately cause a fire.
2, poor insulation of the circuit into the water, resulting in a short circuit.
3, overcharging will easily lead to the decomposition of the electrolyte in the lithium-ion battery to release gas, resulting in the battery becomes bulging, and in serious cases, even smoke and fire; over discharge will lead to damage to the molecular structure of the cathode material in the battery, resulting in the charge can not be charged.
4, temperature will directly affect the battery electrode material activity and conductivity, lithium ion embedding and de-embedding on the electrode, lithium ion permeability of the diaphragm, which in turn affects the internal electrochemical reaction of the battery, lithium-ion battery temperature sensitivity mainly from the temperature sensitivity of its materials.
Battery pack structure and cooling conditions on reliability: The reliability of the battery pack depends heavily on the uniformity of the temperature distribution inside the battery pack. Changing the arrangement of single cells in the battery pack from linear arrangement to cross arrangement and increasing the flow rate of the heat dissipation medium can significantly improve the uniformity of the temperature inside the battery pack, thus enhancing the reliability of the Li-ion battery pack.
Different backup modes of battery pack: Different backup modes will have a significant impact on the reliability of the battery pack. With the increase in the number of series batteries, there will be a decrease in reliability, mainly because with the increase in the number of series batteries, it will lead to changes in temperature distribution, which will reduce the reliability of the battery pack.
Battery charger is a very important part of the UPS battery, the battery charging conditions have a significant impact on battery life. If the battery has been in a constant voltage or floating battery charging state, the UPS battery life can be maximized. In fact, the life of the battery charge state is much longer than the life of pure storage state. Because battery charging can slow down the natural aging process of the battery, so UPS lithium batteries whether operating or shutdown state should keep the battery charged.
Lithium-ion batteries because of its high energy density, high power density and long life characteristics, in the chemical energy storage devices stand out, the safety performance of power batteries determine the market and future of lithium-ion batteries in the power sector, the factors affecting the safety performance of lithium-ion batteries throughout the life cycle of a battery from the cell selection to the end of use, so the reasons are complex and varied levels of rich.
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