Repair method for 18650 lithium battery not charging: check charger and power supply, check battery connection, check battery status and check panel battery protection.
1. Check the charger and power supply: Make sure the charger is working properly and connected to a reliable power source. Try changing the charger or plug and make sure the connection is good.
2. Check the battery connection: Check if the battery connection is stable and the terminal is clean. If the connection is poor, charging may fail.
3. Check the battery status: If the battery has not been used or stored for a long time, it may enter a protection state and cannot be charged. Try using a special activation device or charger. activate the battery.
4. Checkthe battery protection board: 18650 lithium batteries are usually equipped with a protection board to protect the battery from overcharge, overdischarge, short circuit, etc. If the protection board fails or triggers the protection, it may If charging fails, check the condition of the protection board and repair or replace it if necessary.
Charging and discharging principle
The working principle of lithium-ion battery refers to its charging and discharging principle. When the battery is charged, there is lithium. on the positive electrode of the battery. Ions are generated and the generated lithium ions move to the negative electrode through the electrolyte. The carbon used as a negative electrode has a layered structure with numerous micropores. The lithium ions which reach the negative electrode are integrated into the micropores of the layer ofcarbon. The more lithium ions, the higher the charging capacity.
Similarly, when the battery is discharged, the lithium ions embedded in the carbon layer of the negative electrode escape and return to the positive electrode. The more lithium ions that return to the positive electrode, the higher the discharge capacity. What we usually call battery capacity refers to discharge capacity. It is not difficult to see that during the charging and discharging process of lithium-ion batteries, lithium ions. are in a state of positive electrode → negative electrode → positive electrode movement.
If the lithium battery cannot be charged if left for a long time, it can be repaired by charging it normally 3-5 times. If the charger is broken, you can replace it; if it is the battery itself, you can only replace it with a new one.
This is not necessarily a problem with the battery itself. It is very likely that there is a problem with the charger, charging socket and charging socket. You have to check first. If left for a long time, self-discharge will cause the battery to discharge. At that time, the capacity will be lower than normal, making the battery too weak and unable to charge. But lithium batteries are easy to activate. After 3-5 normal charge and discharge cycles, the battery can be activated and restored to its normal capacity.
The reasons why the lithium battery cannot be charged:
1. The lithium battery is in an over-discharged state.
That is, the lithium battery is discharged very weakly, in a deep discharge state, and the energy is basically exhausted, so it is as low as the voltage de cut-off of the lithium battery. At present, an activation method can be adopted, but its effectiveness is uncertain.
2. Charger or chargingThere is a problem with the line.
First of all, you need to check if there is any problem with the charger. The method is very simple. You can directly measure the output voltage or connect a load with the corresponding voltage to observe. problem with the circuit, you will have to put some effort into it. After all, it involves When it comes to problems such as circuit hardware, we can directly disassemble and analyze them if necessary.
3. The lithium battery will fail after prolonged use.
The possibility of this happening is relatively low, but it cannot be ruled out. You should familiarize yourself with your own battery and replace it after how long it has been used.
4. There is a problem with the circuit inBattery charging system or BMS system.
Due to the imbalance of battery cells and other reasons, problems occur in the battery management system, resulting in error of judgment of the management IC and the inability to detect voltage or current.