Quick Answer
An equalizing charge is a process that ensures all cells in a battery pack are at the same state of charge, whereas a balancing charge is a continuous process that maintains the state of charge between cells in parallel strings. Equalization is typically done more frequently, often after a deep discharge, to prevent unequal aging. Balancing is usually done continuously to prevent overcharging.
What is Equalization Charge?
Equalization charge is a process used to maintain a uniform state of charge across all cells in a battery pack, usually after a deep discharge or prolonged storage. This is particularly crucial in lead-acid batteries, which can experience unequal aging due to sulfation and stratification. The equalization charge involves applying a higher voltage to the undercharged cells to bring them up to the same state of charge as the fully charged cells. Typically, the equalization charge is set at 2.35-2.4V per cell for lead-acid batteries and is applied for 14-18 hours, depending on the type and capacity of the battery.
What is Balancing Charge?
A balancing charge, on the other hand, is a continuous process that maintains the state of charge between cells in parallel strings. This is particularly important in lithium-ion batteries, where the cells can degrade unevenly due to internal resistance and temperature differences. The balancing charge involves monitoring the voltage of each cell and adjusting the charging current accordingly to prevent overcharging. Typically, the balancing charge is set at 0.1-0.5A for lithium-ion batteries, depending on the capacity and type of the battery. The balancing charge is usually applied continuously during charging, with the goal of maintaining a delta voltage of less than 10mV between cells.
Find more answers
Browse the full Q&A library by topic, or jump back to the topic this question belongs to.