What is the reason for the explosion of lithium batteries in new energy vehicles

With the continuous development of new batteries, at the beginning of the development trend of new energy vehicles, you can often see reports about explosions when lithium batteries are ignited. Up to now, there are still reports about explosions when lithium batteries are ignited. So what is the reason for the explosion of lithium batteries in new energy vehicles? 1. The external short-circuit failure of the lithium battery. External short-circuit faults can be caused by improper operation or misuse. When an external short-circuit fails, the charging and discharging current of the rechargeable battery is very large, which will make the lithium battery core hot, and the high temperature will shrink the diaphragm or completely destroy the lithium battery core, causing internal Short-circuit failure, which in turn causes a fire accident. 2. There is a short-circuit fault inside the lithium battery. Due to the internal short circuit fault condition, the lithium battery cell is charged and discharged with a large amount of current, which causes a lot of heat generation, burns the diaphragm, and causes a large short circuit fault condition. The lithium battery cell is at a high temperature and the lithium battery electrolyte is dissolved into vapor. As a result, the internal working pressure is too high. When the case of the lithium battery cell cannot bear this pressure, the lithium battery cell will catch fire. 3. The lithium battery is overcharged. When the lithium battery is overcharged, the excessive release of positive lithium will cause changes in the structure of the positive stage, and the released lithium cannot be inserted into the negative stage very well, and it is very easy to cause the lithium on the surface of the negative stage to separate. Moreover, when the operating voltage is above that, the lithium battery electrolyte will dissolve and cause a lot of vapor. The above various conditions are likely to cause fire accidents. 4. The moisture content is too high. Water can react with the lithium battery electrolyte in the lithium battery cell to cause vapor. When the battery is charged, it can react with the converted lithium to cause lithium oxide, which will damage the volume of the lithium battery, and it is very easy to overcharge the lithium battery to cause vapor and water dissolution. The working voltage is low, and the battery is very easy to dissolve and transform into vapor when charging. When the vapor caused by this series of products increases the gas pressure of the lithium battery, when the casing of the lithium battery cannot bear it, the gas pressure of the lithium battery increases, causing the lithium battery explosion occurs. 5. The volume of the negative stage of the lithium battery is not enough. The negative stage on the back of the positive stage has insufficient volume, or no volume at all. When the battery is charged, some or all of the lithium cannot be inserted into the interlayer structure of the high purity graphite in the negative stage, and it will dissolve on the surface of the negative stage, causing bulges. When the next battery is charged, this raised part is more likely to cause the dissolution of lithium. After dozens or hundreds of cycles of battery charging, the twins will grow large and eventually pierce the diaphragm paper. Internal short circuit fault. How to make the used lithium battery safer? 1. There is no need to try to modify the rechargeable battery. 2. The battery is not suitable for overcharging or overdischarging during the charging period. 3. Use the original charging head. 4. Use reliable lithium battery packs. 5. There is no need to put the rechargeable battery in the extreme natural environment (except for some magical rechargeable batteries). High temperature and impact are all the key elements that cause the battery to explode. Try to keep the rechargeable battery in a stable natural environment to avoid high temperature. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: Characteristics of lithium battery packs