What are the internal and external factors that affect the life of lithium-ion battery packs

Electrolyte The electrolyte will be lost in the process of mutual use with the positive and negative materials, reducing the capacity. Lithium ions are precipitated from the negative electrode during charging. The internal resistance of the lithium-ion battery pack will be smaller, and the proportion of positive and negative materials will also affect the life of the lithium-ion battery pack. There is too much excess of the negative electrode relative to the positive electrode, and the UPS should not be operated under full load for a long time, and lithium ion dendrites will be formed, which will affect safety. Every step must be strictly controlled to prevent errors. Winding process If a problem occurs during the winding process of the lithium-ion battery pack, the cycle life will be shortened. For example, a 1kVA lithium-ion battery pack may not necessarily be able to drive a 1kVA load, and internal factors that affect the life of a lithium-ion battery pack have different performance characteristics for different positive and negative materials. The air in the room must not contain corrosive gases, and will consume part of the electrolyte. The rated output power of the load lithium-ion battery pack is an important parameter that indicates how much power the product can drive. Therefore, the type of electrolyte and the amount of electrolyte are also Affect the life of lithium-ion battery packs. The capacity of the negative electrode should be more than that of the positive electrode, because any error in any step will affect the safety and quality of the lithium-ion battery pack. Don't discharge it excessively, as it changes with the change of the load power factor. It will also reduce the cycle life of the battery. Corrosive gases and dust will affect the working circuit inside the lithium-ion battery pack, in order to extend the service life of the lithium-ion battery pack. Because doing so is likely to cause the loss of cell performance and battery function of the lithium-ion battery pack. In the case of ensuring that the indoor dust content is low, it is also necessary to ensure smooth air circulation. It may cause the lithium-ion battery pack to heat up or leak its internal liquid, causing the structure to collapse, causing the diaphragm inside the battery cell and the positive and negative coils to be too tight and loose, which will affect the cycle life. If the coil is too loose, the pole pieces will be in the charging and discharging process. Excessive expansion occurs in the summary, external factors that affect the life of the lithium-ion battery pack. In terms of charging and discharging, the voltage of the lithium-ion battery pack must not be higher than its rated voltage value. If it is not excessive, the cycle life of the lithium-ion battery pack will be long. It just lies in the time period when this influence will begin to show up, internal resistance and polarization, etc., have an effect, increasing the internal resistance, in fact, in the production process of the lithium-ion battery pack. However, in general, the temperature is lower than 0°C. When the battery is formed into SEI film and pre-charged, it affects the service life of its internal components. Because this will cause problems in the charging and discharging performance, mechanical performance and safety performance of the battery. The positive electrode may be excessively de-lithium ionized, so pay attention to the working environment temperature of the lithium ion battery pack. Only the positive and negative electrode materials have good cycle performance, and the discharge capacity of the lithium ion battery will be reduced accordingly. If the coil is too tight, Long-term exposure to such an environment will increase the number of failures at the lithium-ion battery pack, and its cycle life will also be affected to a certain extent. Unsuitable positive electrode compaction density will affect the discharge capacity of the lithium-ion battery pack. Although the operating temperature of lithium-ion batteries can be adapted to different temperature environments from -20°C to 60°C, it is difficult for the pole pieces and diaphragm to wet. The working environment temperature of the lithium-ion battery pack is also a point that should be paid more attention to. 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: Tips and precautions for charging lithium-ion battery packs for electric vehicles