Analysis and solution for daily problems of lithium ion battery.lifepo4 200ah battery pack 12v

　　1. Inconsistent voltage, low individual voltage

　　1. Low voltage caused by high self -discharge

　　The core self -discharge is large, so that the voltage is reduced faster than other, and the voltage can be eliminated by storing the voltage.

　　2. Low voltage caused by uneven charging

　　When the battery is charged after testing, the core charge of the core is uneven due to inconsistency of the contact resistance or charging current of the detection cabinet. There is a small difference in measuring voltage in the short -term storage (12 hours), but there is a large difference in voltage during long -term storage. This low voltage has no quality problem and can be solved by charging. After charging in production, the storage for more than 24 hours to measure voltage.

　　Second, lithium battery swell

　　1. The lithium battery expands when charging

　　When the lithium battery is charged, the lithium battery will swell naturally, but generally does not exceed 0.1 mm, but excessive charging will cause electrolyte decomposition, increase internal pressure, and lithium battery swell.

　　2. Expansion during processing

　　Generally speaking, abnormal treatment (such as short circuit, overheating, etc.) can cause internal heating electrolyte decomposition and lithium battery swell.

　　3. During the cycle

　　The thickness of the battery increases with the number of cycles, but it will not increase after more than 50 weeks. At 0.3 ≤ 0.6 mm, the normal growth of aluminum shells is more serious, which is caused by normal battery reactions. However, if the thickness of the shell is increased or internal materials are reduced, the expansion phenomenon can be appropriately reduced.

　　Third, the internal barrier is too large

　　1. Different test equipment

　　If the detection accuracy is not enough or the contact group cannot be eliminated, the internal resistance of the display is too large. The internal resistance test should be tested by the principle of AC bridge method. Storage time is too long

　　Excessive storage of lithium batteries will cause excessive capacity loss, internal passivation and internal resistance changes, and can be resolved through charge and discharge activation.

　　2. Internal resistance caused by abnormal heat

　　The abnormal heating of the battery is caused by the processing of iron core (welding, ultrasonic waves, etc.), which causes thermal closure phenomenon and increases the internal resistance.

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