18650 lithium battery hibernation activation problem
2023-10-08
18650 lithium battery related issues:
1. Excessive charging and discharging of lithium-ion batteries will cause permanent damage to the positive and negative electrodes. Excessive discharge causes the carbon sheet structure of the negative electrode to collapse, and the collapse will prevent lithium ions from being inserted during charging; overcharging causes too many lithium ions to be embedded in the carbon structure of the negative electrode, and some of the lithium ions can no longer be released.
2. The working principle of lithium-ion battery refers to its charging and discharging principle. When the battery is charged, lithium ions are generated on the positive electrode of the battery, and the generated lithium ions move to the negative electrode through the electrolyte. The carbon used as the negative electrode has a layered structure, and it has many micropores. Lithium ions that reach the negative electrode are embedded in the micropores of the carbon layer. The more lithium ions are embedded, the higher the charging capacity.
3. 18650 is only the size and model of the battery. According to the type of battery, it can be divided into 18650 for lithium ion, 18650 for lithium iron phosphate, 18650 for nickel metal hydride (rare), and the common 18650 is lithium ion.
How to activate the 18650 lithium battery with a protection board if it is short-circuited?
Generally, there are two ways to activate the short circuit protection:
One is automatic activation, that is to say, it can be activated automatically after being left for a period of time after a short circuit.
The other is charging activation, that is, it will be activated when the battery is charged.
If it cannot be charged after a short circuit, the protection board may be broken.
One is automatic activation, that is to say, it can be activated automatically after being left for a period of time after a short circuit.
The other is charging activation, that is, it will be activated when the battery is charged.
If it cannot be charged after a short circuit, the protection board may be broken.
The 18650 battery has been placed for a long time and cannot be charged, how to activate it?
If the 18650 battery cannot be charged after being placed for a long time, it means that the battery has been scrapped and cannot be used, mainly because of the chemical characteristics of lithium battery
However, you can try the following methods first:
1. Test the voltage range of the battery. If the normal battery is lower than 2.75V, the battery has been scrapped.
2. If the battery voltage is 2.75~3.3V, the battery is basically scrapped. You can try to charge it with a small battery, such as 0.05C or 0.1C.
3. If the battery voltage is 3.3V~3.6V, it can be charged with a small current, such as 0.1C or 0.2C, etc.
4. If the battery voltage is above 3.6V, it can be charged normally. It can be 0.2C or 0.5C, no problem.
Electrochemical reaction mechanism of lithium-ion battery: A lithium-ion battery is mainly composed of positive electrode, negative electrode, electrolyte and diaphragm, plus positive and negative lead wires, safety valve, PTC (positive temperature control terminal), battery case, etc. Working is a process of chemical reaction and electrical conversion.
If the battery is in a state of depletion for a long time, the internal chemical activity will be weakened and irreversible changes will occur. In this case, the battery is basically scrapped, so when our battery needs to be placed for a long time, it should be fully charged first, and after 3-6 months About time for a charge and discharge.
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