On the other hand, in case of two- or multi-cell batteries (all stand-alone ICs except Analog Front End ICs), the battery charger monitors only the total voltage of the cells connected in series. The overcharge detection by protection ICs is the primary protection.
The battery protection circuit disconnects the battery from the load when a critical condition is observed, such as short circuit, undercharge, overcharge or overheating. Additionally, the battery protection circuit manages current rushing into and out of the battery, such as during pre-charge or hotswap turn on.
In case of one-cell Li-ion batteries, the overcharge protection functions when the battery charger is malfunctioning. On the other hand, in case of two- or multi-cell batteries (all stand-alone ICs except Analog Front End ICs), the battery charger monitors only the total voltage of the cells connected in series.
Hardware-type protection board: Use special lithium battery protection chip, when the battery voltage reaches the upper limit or lower limit, the control switch device MOS tube cut off the charging circuit or discharging circuit, to achieve the purpose of protecting the battery pack. Characteristics: 1.
Battery protection circuits / IC solutions and reference designs that allow easy design-in and ensure safe charging and discharging - prevent damage and failures.
There are four basic detection circuits inside Li-ion battery protection ICs. 1. Overcharge Detection The protection prevents battery cells from overcharging. It cuts off charge current when the cell voltage reaches the overcharge threshold during charging the battery. 2. Overdischarge Detection