Lithium-ion batteries are much safer than lead-acid batteries, but they can still malfunction. Understanding the causes of lithium-ion battery failures is crucial for quickly addressing problems when they occur.
●Battery internal resistance
Improper welding of the positive and negative electrode plates during soldering, or excessive internal resistance in the contact between the rivets and the pressure plate, can affect the internal resistance of a lithium-ion battery. Insufficiently small pores in the separator can also affect the battery's internal resistance.
●Battery voltage
During the production of lithium-ion batteries, impurities in the positive electrode and dendrites in the negative electrode can both cause a decrease in battery voltage. Incomplete formation of the SEI film during formation can also lead to excessively low battery voltage.
Problems encountered during the use of lithium-ion batteries
◆Unable to charge/discharge
There are several possible reasons why a lithium-ion battery may not charge properly during charging or discharge normally during use.
The inability of a lithium-ion battery to be effectively charged can be caused by factors such as the protection board failing to restore its protection, a malfunction of the protection board, or a short circuit between the lithium-ion battery and the external electrical appliance.
The lithium-ion battery's low voltage protection board or controller will activate, and damage to either the protection board or the controller will prevent the lithium-ion battery from discharging properly. A disconnected circuit will also result in the same outcome.
◆Temperature anomaly
If a lithium-ion battery experiences abnormal temperature changes during charging or discharging, such as overheating, the cause may be a minor short circuit within the battery.
If a lithium-ion battery suddenly stops working during use, it is very likely that the battery has been completely discharged, reaching the minimum voltage limit of the protection board or controller, causing the battery's self-protection function to activate and resulting in a power outage.
Prolonged operation with excessively high current, exceeding the design protection current of the protection board or the continuous current of the controller, can cause the protection board or controller to stop working, resulting in the sudden shutdown of the lithium-ion battery.
