What kinds of damages do high temperature and low temperature do to lithium batteries?

What kind of damage does high temperature and low temperature do to lithium batteries? High temperature damage to lithium batteries: the temperature drops, and the electrode reaction rate also drops. Assuming that the battery voltage remains unchanged, the amount of charge and discharge current decreases, and the power of the rechargeable battery decreases. From the perspective of various environmental factors, temperature is more harmful to the charging characteristics of rechargeable batteries. The electrical level is closely related to the electrochemical corrosion of the lithium battery electrolyte page and the working temperature. The lithium battery electrolyte page is considered to be charging Cardiovascular battery. On the contrary, it is the temperature rise, that is, the power of the lithium polymer lithium battery rises. In addition, temperature will continue to harm the transportation rate of lithium battery electrolyte, the temperature rise will accelerate, the transportation temperature will decrease, and the transportation rate will slow down, and it will continue to harm the charging characteristics of lithium batteries. However, a high temperature exceeding 45°C will destroy the balance of chemical reactions inside the rechargeable battery and cause adverse reactions. Damage of lithium battery at low temperature: When used in a low temperature natural environment for a short time, or when the temperature is not low enough, lithium batteries can only temporarily harm the battery power, but it is not easy to cause permanent damage. However, long-term use in a low-temperature natural environment, or use in a low-temperature natural environment of -40°C, is likely to cause the 'freezing' of the lithium battery and cause permanent damage. In addition, when a lithium battery is charged at a low temperature, lithium metal will be dissolved on the anodic oxidation surface of the rechargeable battery, and the whole process is irreversible. This will cause permanent damage to the rechargeable battery and reduce the safety factor of the rechargeable battery. Therefore, many lithium battery devices have protective equipment, so that the battery cannot be charged at low temperatures. The influence of temperature on the charging of lithium batteries In the power supply system of pure electric vehicles, temperature control is one of the most important parameters, and it is also a key element that harms battery performance. In all battery detection system software, it is not necessary to indicate the temperature. It has great harm to battery performance, including internal resistance, filling characteristics, charging and discharging characteristics, safety factor, and service life of rechargeable batteries. The average charge-discharge working voltage and volume of lithium batteries decrease with the decrease of temperature, especially at -20°C, the charge-discharge volume and uniform charge-discharge working voltage of rechargeable batteries decrease faster. According to electrochemical decomposition, SEI film resistors and aqueous solution resistors do not change much in the entire temperature range, and are less harmful to the low-temperature characteristics of rechargeable batteries; while the charge transfer resistors vary greatly in the entire temperature range, and are different from each other. Aqueous solution resistors and SEI film resistors have larger changes. The reason for this depends on the decrease in temperature, the decrease in the positive ion conductivity of the lithium battery electrolyte, the increase in SEI film resistors and electrochemical corrosion resistors, which in turn causes the electrical polarization, concentration polarization and photoelectricity of the European mother at low temperatures. The increase in catalytic polarization is critically manifested in the charge-discharge curve of rechargeable batteries as both the average working voltage and charge-discharge volume decrease with the decrease of temperature. It is best to use lithium batteries at a temperature of 0 to 35°C. The specificity of lithium batteries is reduced under low temperature standards, the charging and discharging ability of rechargeable batteries is weakened, and the use time is reduced. In a short-term low-temperature natural environment, the destruction of lithium batteries is only temporary, and it is not easy to cause harm to the battery power. After the temperature warms up, the characteristics will be restored. However, if the rechargeable battery is charged in an ultra-low temperature working environment for a long time, the anodic oxidation surface of the rechargeable battery will dissolve the metal lithium. This whole process is irreversible and will cause permanent damage to the battery power. Because of the product quality problems of the rechargeable battery itself, and its own product quality problems and embrittlement problems, the mobile phone will be automatically turned off at low temperatures. On the one hand, it is for the purpose of protecting the battery. On the other hand, it is also because the manufacture of its own battery is not Qualified and caused by aging. Summary: Because the low-temperature charging and discharging of the lithium battery's working voltage service platform is low, the low-temperature charging and discharging volume is significantly reduced, but with the development of battery charging at room temperature, the damage will be fully compensated and belongs to reversible damage. However, when the low-temperature battery is charged, the temperature is too low or the rate is too high, which usually causes the irreversible appearance of lithium dendrites and irreversible volume damage of the lithium battery cell, thereby jeopardizing the safety factor of the rechargeable battery. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous article: How processors test lithium battery packs