What is the reason for the swelling of lithium-ion battery packs

1. Expansion of Li-ion battery when charging Li-ion battery When charging the lithium-ion battery, the temperature of the lithium-ion battery will undoubtedly rise steadily, but it is not easy to exceed a certain rated temperature under normal conditions. The key depends on the customer. If the customer is paralyzed when using lithium-ion products, if the battery is charged and discharged, or if the battery is used in an extremely harsh environment, it may lead to an increase in lithium ion. 2. Manufacturing and processing; under normal circumstances, the over-temperature process of lithium-ion batteries (such as short-circuit failure, overheating, etc.) leads to over-temperature of the lithium-ion battery electrolyte, and the lithium-ion battery rises steadily. Environmental pollution in production and manufacturing, broken, obsolete and similar problems in production and manufacturing machinery and equipment have resulted in irregular metal coatings for rechargeable batteries, and lithium-ion battery electrolyte infiltrated dust particles. These have the potential to drive the rise of lithium-ion packages in customer applications, and greater safety risks. 3. Expansion during cycling. When the rechargeable battery is in the respiratory system, the thickness of the plastic film increases with the increase in the frequency of the respiratory system, but the substrate does not improve after 50 weeks. Under normal conditions, all normal annual rates of increase are the same, and the aluminum case is more serious. This situation belongs to all normal rechargeable battery reflective surfaces. However, if the thickness of the shell is increased or the internal raw materials are reduced, the steady rise can be alleviated. The average production and manufacturing level of rechargeable batteries, the metal electrode coating is irregular, and the entire manufacturing process is relatively rough. 4. Battery short-circuit failure problem. Under normal circumstances, the position of electric welding is deviated. The proper position of electric welding should be welded on the bottom or side. There is no sign on the side, and many cannot be welded. In addition, some of them have poor welding characteristics, so it is necessary to choose high-current welding to make the internal high-temperature welding reasonable, leading to internal short-circuit failure of the lithium-ion battery. Short-circuit faults often undergo chemical changes, and a large amount of calorific value will appear. In addition, the resonance principle will appear to dissolve and vaporize, and the rechargeable battery will be upgraded. 5. But it is also possible that the battery has not been used for a long time, is worn-out, obsolete, that is, the long-term rechargeable battery has not been used, and there is no better storage treatment. When it is exposed to the air for a long time, it has no use, and the electricity is diffuse. Because the important reason is that the gas is conductive at a relative level, the long discharge time is equal to the direct contact of the rechargeable battery. The important principle of lithium-ion batteries is that the structure of the battery causes chemical changes and a large amount of heat that are common faults in short circuits. 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: How to judge which brand of lithium ion battery is better?