What is the reason why mobile phone batteries need to be tested after they are manufactured

First, the mobile phone battery is manufactured in a harsh environment and the equipment is relatively old. The coating of the battery is not uniform, so that the electrolyte is mixed with impurities such as dust particles. This is very easy to cause the cell phone battery to bulge during use. The problem is caused by the quality of the lithium-ion battery. This reason explains why mobile phone batteries need to be tested after they are manufactured, including appearance testing, safety testing, reliability testing, etc. The purpose is to eliminate inferior batteries with unqualified processes and poor quality. The high-current shrapnel micro-needle module of the battery detection module is used in the cell phone battery detection, which is beneficial to improve the detection efficiency and promote the stability of the detection. The high-current shrapnel micro-needle module has the characteristics of being able to over-current, can maintain stable current transmission in the range of 1-50A, is too smooth and fast, and the connection is stable; in a small pitch, it can cope with the range of 0.15mm-0.4mm Pitch value, high overall accuracy, without pin stuck, keep a reliable connection during the whole cell phone battery testing process. The second is the battery swelling caused by improper methods in the use of mobile phone batteries, such as overcharging, overdischarging, or continuous use in extreme environments. Overcharging will cause the lithium in the positive electrode material to run into the negative electrode material, so that the lithium in the negative electrode reaches an over-saturated state, and stump-like crystals grow, which causes the cell phone battery to expand. Due to the escape of lithium in the positive electrode material, the internal grid is deformed and collapsed, and the battery power of the mobile phone will gradually decrease. Excessive discharge will destroy the SEI film. The SEI film can protect the negative electrode material of the mobile phone battery, make the structure more stable, and increase the cycle life of the negative electrode material of the battery. After the SEI film is destroyed, the negative electrode material collapses and the cell phone battery bulges. The third is that the charger does not meet the requirements, it will also cause the mobile phone battery to swell, and even more serious safety accidents may occur, resulting in a short circuit of the circuit and destroying the performance of the battery. When the mobile phone battery is not used for a long time and has not been stored for a long time, the mobile phone battery will be exposed to the air for a long time, and the air can conduct electricity, which will cause the battery's positive and negative poles to directly contact and cause a short circuit, which will cause the battery to bulge. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete.