Experimental setup A small-scale fault experiment for the series-connected lithium-ion battery pack considering the given cell with low capacity, low SOC, internal resistance fault, connection fault, and the external short circuit was conducted under laboratory conditions to verify the proposed method.
Except for the cells within the normal lithium-ion battery set, the remaining cells within the lithium-ion battery set are judged to be faulty cells. For a fault-free lithium-ion battery pack, the trend of the voltage data during the charging phase of the individual cells tends to be similar.
It is well known that in the early operation of the power battery pack, cells in the battery pack are all normal. With the service of the lithium-ion battery pack, individual cells may have different types and degrees of faults. Therefore, in the early stage of fault, the majority of cells in the pack are healthy cells.
Voltage serves as an indirect indicator of both percentage and SoC. Each type of rechargeable battery has a specific voltage range corresponding to its charge state. For example, a fully charged lithium-ion battery typically shows a voltage of around 4.2 volts per cell. In comparison, a fully discharged cell might drop to about 3.0 volts.
As an example, a 24V lithium-ion battery pack typically has six cells connected in series. Rupture of battery case with exposure of internal components These hazards present significant risk to workers and can be reduced if time is taken to understand the technology and the root cause of these events.
There are four basic cell designs; button/coin cells, polymer/pouch cells, cylindrical cells, and prismatic cells (see Figure 3). A lithium-polymer battery, or more correctly lithium-ion polymer battery (abbreviated as LiPo, LIP, or Li-pol) is a Li-ion battery in which the electrolyte has been "plasticized" or "gelled" through a polymer additive.