What are the basic causes of flatulence in soft-pack polymer lithium batteries?

The reason for the flatulence of soft-packed polymer lithium batteries The key materials used in soft-packed lithium batteries: positive electrode materials, negative electrode materials and separators are not much different from traditional steel shell and aluminum shell lithium batteries. The biggest difference lies in the soft packaging material ( Aluminum-plastic composite film), which is the most critical and technically difficult material in soft-pack lithium batteries. The polymer lithium battery cell adopts the packaging technology of aluminum-plastic composite film. When gas appears inside the battery cell due to the occurrence of abnormal chemical reaction, the pocket will be charged and the battery cell will swell (there are two situations: slight swelling and severe swelling) ), regardless of the appearance, the performance of the battery cell will suffer serious failure, causing the battery cell to be unusable. 1. The surface of the Pocket is damaged, and the battery core is abnormally damaged or artificially damaged during the flow process, which causes the Pocket to be damaged (such as pinholes) and moisture enters the battery core. 2. The corner is damaged. Due to the special deformation of the aluminum at the corner of the flange, the air bag shaking will distort the corner and cause Al damage (the larger the battery cell, the larger the air bag, the easier it is to break), and it loses its use as a barrier to water. 3. The formation process is abnormal, and the wrong formation process will cause flatulence in the polymer lithium battery cell. 4. The SEI film is unstable, and the battery cell emits slightly flatulence during the charging and discharging process of the capacity test. 5. Overcharge and over-discharge, the battery cell will be overcharged or over-discharged due to the abnormality of the process or the machine or the protection board, and the battery cell will be seriously out of air. 6. Corrosion, the core of the soft-packed lithium battery corrodes, the aluminum layer is consumed by the reaction, loses its use as a barrier to water, and causes flatulence. Can the soft-pack polymer lithium battery flatulence still work? 1. If the agitation is obvious, then the battery core is broken. 2. Under normal circumstances, such a battery will become very durable or even unable to be charged and cannot be used, and there are more potential safety hazards. 3. It is recommended that the user replace the soft-packed polymer lithium battery as soon as possible to prevent it from affecting normal use. Soft-packed polymer lithium batteries are actually divided into soft-packed lithium batteries and polymer lithium batteries. The difference between them is that the polymer lithium battery has a colloidal electrolyte inside, which feels hard on the outside; the inside of the soft-packed lithium battery is The liquid electrolyte, the outside of the battery feels slightly softer, in fact, the soft-pack lithium battery was invented because of the immature processing technology of polymer lithium battery. These two batteries are the same as twin brothers. Most people don’t know the difference clearly and don’t know their difference. In fact, for ordinary consumers, the difference between the two batteries is really not much, just the time of use. Longer, for example, after 3.4 years of use, the soft pack battery bulges a little bit more, while the polymer battery is much milder, at most it looks a little thicker. So if you don’t have too strict requirements for battery expansion, then I suggest that you can use soft-pack lithium batteries with confidence, but the current threshold for soft-pack battery processing is low and mixed. There are many low-end manufacturers in order to pursue it for a while. Many unqualified soft-pack batteries have been put into the market, especially those used in copycat mobile phones and low-end Bluetooth headsets. This has led to a sense of distrust of soft-pack batteries. 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 article: Future development technology and prospect analysis of lithium titanate battery