What are the situations where the lithium battery cannot be charged?

There are many types of lithium batteries. There are batteries composed of round cells like 18650, and there are also lithium batteries composed of polymers. If they are divided into two categories, they are lithium metal batteries and lithium batteries. The charging method is basically constant. Current charging, constant voltage charging, pulse charging, etc., use different charging methods at different stages. If charging fails, there are no more than several situations: 1. The lithium battery is in an over-discharged state, which means that the lithium battery is discharged very low. It is in a deep discharge state, and the power is basically used up, so that it is as low as the cut-off voltage of the lithium battery. At this time, the activation method can be adopted, but this is not necessarily effective; 2. There is a problem with the charger or the charging circuit. No problem, the method is very simple, just measure the output voltage directly or observe the load of the corresponding voltage. If there is a problem with the circuit, then it will take a little effort. After all, it involves circuit hardware and other problems. If necessary, directly disassemble and analyze it. ; 3. The lithium battery has been used for a long time, and the possibility of battery failure is relatively small, but it cannot be ruled out. You should be familiar with your own battery, and you should replace the battery after using it for a long time; 4. Battery charging IC Or there is a problem statement in the BMS system: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete the previous article: What are the common charging methods for lead-acid batteries?