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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.
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 charge and discharge 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.
4. The distance between the circulation system is harmful to the SOH concentration of rechargeable batteries.
The cycle system interval time of charging and discharging lithium battery packs will also endanger the whole process of embrittlement of rechargeable batteries. The interval time of the cycle system is different. The internal resistance of the matched battery is different, so the rechargeable battery will be hot and the reaction during the cycle system will be slightly different. , Long-term operation will endanger the physical and mental health and fragility of rechargeable batteries. Experts believe that the SOC range of rechargeable batteries is 20% to 80%, which is beneficial to the physical and mental health of rechargeable batteries and the service life of the circulatory system.
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