In recent years, 502030 battery have been widely used in the manufacturing industry mainly due to their high kinetic energy and high safety factor. Even though the safety factor of lithium-ion is much higher than that of lead-acid batteries, if it is paralyzed or manufactured and manufactured at an average level, there is no relative safety risk. Why do lithium batteries expand? What is the reason for the expansion of lithium battery packs. 1. Lithium battery expands when charging When lithium-ion battery is charging, the temperature of the lithium-ion battery will undoubtedly rise steadily, but it will not easily exceed a certain rated temperature under normal circumstances. The key depends on the customer itself. 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 cause the rise of lithium-ion. 2. Manufacturing and processing;

　　Under normal circumstances, the over-temperature process of lithium-ion batteries (such as short-circuit failure, overheating, etc.) causes the electrolyte of lithium-ion batteries to overheat, and lithium-ion batteries grow steadily. Manufacturing, manufacturing environmental pollution, damaged, obsolete manufacturing machinery and similar problems lead to irregularities in the metal coating of rechargeable batteries and the penetration of lithium-ion battery electrolytes into dust particles. These have the potential to drive a rise in lithium-ion packages in customer applications, posing greater safety risks.

　　3. Expansion during cycling When the rechargeable battery is in the respiratory system, the thickness of the plastic film increases as the respiratory frequency increases, but the substrate does not improve beyond 50 cycles. Under normal conditions, all normal annual growth rates are, aluminum casing is more serious, this situation belongs to all normal rechargeable battery reflective surfaces. However, steady growth can be mitigated if the shell thickness is increased or the internal raw material is reduced. The production and manufacturing level of rechargeable batteries is average, the metal electrode coating is irregular, and the entire manufacturing process is relatively rough. 4. The problem of battery short circuit failure. Under normal circumstances, the position of electric welding is deviated. The proper position of electric welding should be welding on the bottom or side. There is no mark 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, so that the internal high-temperature welding is reasonable, causing internal short-circuit failure of the lithium-ion battery. Short circuit faults often undergo chemical changes, which will produce a large amount of heat value. In addition, the thin and long will produce resonance principles to dissolve and vaporize, and the rechargeable battery will be lifted. 5. But it is also possible that the battery has not been used for a long time, is worn out, and is old. In other words, the long-term rechargeable battery has not been used and has not been properly stored. When it is exposed to the air for a long time, it is of no use and the charge is diffuse. Because the main reason is that gases are conductive at relatively high levels, long discharge times equal direct contact with the rechargeable battery. The main principle of lithium-ion batteries is that the structure of the battery causes chemical changes and a large amount of heat, which is a common failure of short circuits.

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