Brief description of charging methods for lead-acid batteries and lithium batteries

Regarding the charging method of lead-acid batteries, before connecting the batteries, calculate the charging voltage based on the number of batteries in series, and then set the required voltage and current limits. To charge a 12-volt lead-acid battery (six batteries) to the voltage limit of 2.40V, set the voltage to 14.40V (6x2.40). Select the charging current according to the battery size. Regarding lead acid, this is 10% to 30% of the rated capacity. A 10Ah battery, 30% of the power is about 3A; the percentage can be lower. The 80A starter battery can be charged at 8A. (A 10% charge rate is equal to 0.1C.) When charging, also pay attention to the battery temperature, voltage and current. Be sure to charge in a well-ventilated room. Once the battery overflows and the current drops to 3% of the rated Ah, the charging is complete. Disconnect charging. If the current has bottomed out and cannot be reduced, disconnect the charging after 16-24 hours; high self-discharge (soft short circuit) can prevent the battery from reaching a low saturation level. But it is also possible to use the power supply to balance the lead-acid battery by setting the charging voltage to 10% higher than the proposed value. The time of overcharging is very important, so you have to observe it carefully. The power supply can also reverse sulfation. Set the charging voltage higher than the proposed level, adjust the current limit to the lowest actual value and observe the battery voltage. The fully sulfated lead acid can first draw a very small current, and as the sulfated layer dissolves, the current will gradually increase. Raising the temperature and placing the battery on an ultrasonic vibrator may also help the process. If the battery does not accept charging after 24 hours, it is unlikely to recover. Regarding the charging method of lithium batteries, the charge of lithium ion is similar to that of lead acid. We can also use the power supply, but we must be very careful. Check the full charge voltage, usually 4.20V/battery, and set the threshold accordingly. Ensure that none of the batteries connected in series exceed this voltage. (The protection circuit in the commercial battery pack does this.) When the battery reaches 4.20V/battery voltage and the current drops to 3% of the rated current, or has bottomed out and cannot drop further, a full charge is reached. Please disconnect the battery after the battery overflows. Never allow the battery to stay at 4.20V for more than a few hours, otherwise there is a danger of explosion. Note that not all lithium batteries are charged to the voltage threshold of 4.20V/battery. Lithium iron phosphate is usually charged to a cut-off voltage of 3.65V/cell and lithium titanate to 2.85V/cell. Some energy batteries can accept 4.30V/cell and higher. It is important to observe these voltage limits. 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 advantages of lithium batteries?