The lithium battery charging current is determined based on the capacity. The higher the current, the more difficult it is to fully charge the battery. This is done to protect the lithium battery from normal use, as overcharging and overdischarging can cause the lithium battery to leak, malfunction, or even explode.
In terms of the charging current of the lithium battery fast charging stage during the charging process, as a dynamic process, the optimal charging current of the lithium battery is actually divided into three stages.
1. The optimal current during precharge: That is, when the initial/no-load voltage of the lithium battery is lower than the precharge threshold, it should first go through a precharge stage. Only one lithium-ion battery is affected. This threshold is typically 3.0 V. At this point, the precharge current is approximately10% of the current of the next stage - the constant current charging stage.
2. The optimal current during constant current charging: The so-called constant current means that the current is constant, the voltage gradually increases and at this time it enters the fast charging phase. Most constant current charging current settings are between 0.4 and 0.6 C, which can be understood as 0.5 C, which means it can be fully charged in about two hours without holding take other factors into account. The reason 0.5C was chosen is that this current is a good balance between charging time and charging safety.
3. Charging current during constant voltage charging: For a single-cell lithium-ion battery, when the battery reaches a certain voltage value, it enters constant voltage charging. This voltage value is generally 4.2 V. step, the voltage remains unchanged and the currentant decreases; this current reduction is a sequential decreasing process. Most lithium battery protection chooses 0.01C as the termination current, which means that the charging process enters the final state. After charging is completed, the charging current drops to zero.
The core of the optimal charging current for lithium batteries is the current design during constant current charging. It is worth pointing out here that most portable lithium batteries are preferably designed for 0.5C charging, like conventional 18650 lithium batteries. The capacity is 1800-2600mAh and 1A charging can be selected, while the rate type is 1200-1500mAh and 0.5C charging current is 0.7A Strictly speaking, the maximum charging current of lithium batteries is determined by the structure of the battery. Therefore, various lithium battery manufacturershave inconsistent regulations. Some are set at 0.6 C, and the highest regulation for portable lithium batteries is 1 C.
How to calculate the charging current of lithium batteries?
The maximum charging current that lithium batteries can accept is usually 1C or even less. The charging current of lithium batteries is usually indicated. The charger. You can see Generally speaking, lithium batteries use a constant current and then constant voltage charging mode. When the charger reaches the limit voltage, a trickle charge will be carried out, so the charging time will be added to about 1 hour for charging. time, divide the battery capacity by the charging current, add the conversion loss and finally add one hour.
Lithium iron phosphate batteries can generally use a charge and discharge current of 1C or more (15C), ellThey are therefore more suitable as power batteries. 18650 battery charging time versus all secondary battery charging timeThe theory is the same, that is, the battery charging time is equal to the ratio of rated capacity to current dump. However, since the lithium battery will generate internal impedance when charging, the charging time of the 18650 battery needs to take into account factors to overcome. this impedance< /p>
48v charger.
The charging current of lithium batteries is generally 0.2C to 0.8C, among which 0.2C charging current is the best.
The normal lithium battery is 54.6V and the charger is labeled 48V but the voltage is 54.6V. It is better to use a multimeter to measure the output voltage of the charger.