Engineered for NexSys® iON Lithium-ion batteries, but compatible with wide range of battery technologies, NexSys®+ chargers slash opportunity recharge times, enabling better productivity.
How complex is a battery charging system?
The complexity (and cost) of the charging system is primarily dependent on the type of battery and the recharge time. This chapter will present charging methods, end-of-charge-detection techniques, and charger circuits for use with Nickel-Cadmium (Ni-Cd), Nickel Metal-Hydride (Ni-MH), and Lithium-Ion (Li-Ion) batteries.
About 65% of the total charge is delivered to the battery during the current limit phase of charging. Assuming a 1c charging current, it follows that this portion of the charge cycle will take a maximum time of about 40 minutes. The constant voltage portion of the charge cycle begins when the battery voltage sensed by the charger reaches 4.20V.
What is the current limit phase of a battery charger?
During the current limit phase, the charger must limit the current to the maximum allowed by the manufacturer (shown as 1c here) to prevent damaging the batteries. About 65% of the total charge is delivered to the battery during the current limit phase of charging.
What are the different types of battery charging methods?
In the realm of battery charging, charging methods are usually separated into two gen-eral categories: Fast charge is typically a system that can recharge a battery in about one or two hours, while slow charge usually refers to an overnight recharge (or longer).
What is the minimum discharge voltage for a battery?
For example, if the average load is 50A and the battery has a rated capacity of 400 AH at the 8-hour rate, the minimum discharge voltage would be 12.11 volts for a 50% DOD. An easy method to estimate the State of Charge (SOC) of the battery is by measuring its Open Circuit Voltage (OCV).
Connect batteries using cabling that is sized for the maximum load of the system. The voltage drop on the cables during charging should not exceed 0.2 volts at full output. Protect the battery terminals from shorting during installation. When replacing batteries, it is best to replace the entire set of batteries so they remain balanced. Figure 5-1.