Popularization of common sense about lithium-ion batteries

1. Memory effect: a common phenomenon on Ni-MH rechargeable batteries. The detailed performance is: If you start using the battery without overflowing for a long time, the battery's power will drop significantly, even if you want to overflow in the future, you will be dissatisfied. Therefore, the most important way to maintain Ni-MH batteries is to charge them only when they are used up, and allow them to be put into use only when they are overflowing with electricity. The memory effect of lithium batteries commonly used today can be negligibly small. 2. Fully charged and fully discharged: it is for lithium batteries. Full discharge refers to the process of adjusting power-consuming smart devices, such as mobile phones, to the lowest power state to consume power until the mobile phone automatically shuts down. Fully charging refers to the process of connecting a fully discharged smart device with electricity, such as a mobile phone, to the charger until the mobile phone prompts overflowing. 3. Over-discharge: It is for lithium batteries. There will still be a small amount of power inside the lithium battery after it is completely discharged, but this part of the power is critical to the activity and life of the lithium battery. Over-discharge: After being completely discharged, if you continue to use other methods, such as forcibly turning on the phone again, and connecting the battery to a small light bulb to consume residual power, this is called over-discharge and will cause irreversible damage to the lithium battery. 4. Protection chip: Lithium batteries have very strict requirements on the current and voltage that are connected during charging and discharging. In order to protect the battery from damage due to abnormal external electrical environments, a chip that manages the working status of the battery is installed inside the battery body. This chip also has the function of recording battery capacity and correcting battery capacity. At present, even counterfeit mobile phone batteries will not save this key protection chip, otherwise the counterfeit mobile phone battery will not be used for a long time. 5. Overshoot and overdischarge protection circuit: built-in smart devices with electricity use chips and circuits that fully manage battery work. For example, there is such a circuit on a mobile phone, and its functions are as follows: (1) When charging, it supplies the most suitable voltage and current to the battery. Stop charging at an appropriate time. (2) When not charging, always check the remaining battery power, order the phone to shut down at an appropriate time, and beware of over-discharge. (3) When starting up, check whether the battery has been completely discharged, if it has been completely discharged, prompt the user to charge, and then shut down. (4) Beware of abnormal power of the battery or charging line, and disconnect the circuit when the abnormality is found to protect the mobile phone. 6. Overcharge: It is for lithium batteries. Under normal circumstances, when a lithium battery is charged to a certain voltage (that is, overflow), the charging current will be cut off by the upper-level circuit. However, due to the different voltage and current parameters of the built-in overshoot and overdischarge protection circuit in some devices (such as mobile phone battery holder charging), This has led to the phenomenon that although it has overflowed, the charging has not stopped. Overcharging can also cause damage to battery performance. 7. Activation: If the lithium battery is not used for a long time (more than three months), the electrode material will be passivated and the battery performance will decrease. You can use three full charge and full discharge to release the purification, and give play to the highest performance of the battery. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: What are the important factors that affect the low-temperature performance of lithium-ion batteries