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In recent years, reference documents in various countries around the world have carried out a lot of scientific research on the embrittlement system and regularity of lithium batteries. It is widely believed that the accumulation of lithium-ion batteries, the increase in SEI film thickness and the damage of active materials are caused by the embrittlement and volume attenuation coefficient of rechargeable batteries. The key reason. The indiscriminate use of lithium batteries will accelerate the embrittlement of rechargeable batteries, and all normal charging and discharging will also endanger the physical and mental health of rechargeable batteries and accelerate the embrittlement of rechargeable batteries.
Solar Lighting Battery Lithium
1. The harm of temperature to the SOH value of rechargeable batteries.
It is generally believed that temperature is a key element that endangers battery health. Temperature has a two-way hazard to battery performance. On the one hand, high temperature will accelerate the internal chemical changes of rechargeable batteries and improve the high efficiency and characteristics of rechargeable batteries. On the other hand, high temperatures will make some irreversibles. The chemical change produced by the rechargeable battery reduces the active material in the rechargeable battery, and causes the embrittlement of the rechargeable battery and the volume attenuation coefficient. Scientific research results show that high temperature will accelerate the growth and development of SEI film of rechargeable batteries, increase the difficulty of lithium-ion batteries through SEI film, and increase the internal resistance of rechargeable batteries.
2. The harm of charging and discharging current rate to SOH composition.
Using sony18650 rechargeable battery to carry out three different charge and discharge multiples of 300 cycle system tests, the results show: the respective attenuation coefficient of battery power, battery power reduction, battery internal resistance expansion, battery internal resistance expansion, battery internal resistance expansion, battery internal In addition, the charging and discharging of polymer cells will cause a lot of heat inside the rechargeable battery, which will accelerate the embrittlement of the rechargeable battery. According to the observation of the transmission electron microscope, the surface SEI film of the charge and discharge level of the polymer cell rechargeable battery is lower. Multiple charge and discharge film thickness.
3. The harm of deep discharge to the SOH value of rechargeable batteries.
Battery charging is deeply related to the battery's physical and mental health and embrittlement. Some insights believe that the battery has accumulated total migration kinetic energy. Based on the total migration kinetic energy, the volume attenuation coefficient and embrittlement of the battery are analyzed. According to the deep cyclic system experiments on different charging and discharging of lithium batteries, Feixiang et al. analyzed the relationship between the accumulated migration kinetic energy of the battery and the battery capacity attenuation coefficient, and obtained that the battery capacity attenuation coefficient reached 85% before the battery is deep charged and deep discharge and shallow discharge The accumulated migration kinetic energy under the two methods are basically the same. When the battery capacity attenuation coefficient reaches 85%~75%, the accumulated migration kinetic energy and high efficiency of kinetic energy under the deep charge and deep discharge method is better than the shallow discharge method.
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