CHARGEX® Prismatic LiFePO4 Cell Structure
The main components of a Prismatic Cell Include -
- Top Cover
- Positive Plate
- Negative Plate
- Diaphragm (Laminate or Coil)
- Safety Components
- OSD - Overcharge Device
- NSD - Nail Safety Device
NSD (Nail Safety Device) adds the metal layer on the out part of the coil core, such as the copper sheet. When nail penetration occurs, the large current generated at the nail penetration position quickly reduces the current per unit area through the large area of the copper sheet, which can prevent local overheating at the nail penetration position and reduce the cells thermal runaway.
OSD (Overcharge. Safety Device) is a metal sheet, used with a Fuse that can be designed on the positive electrode collector fluid. The pressure generated inside the battery cell during overcharge makes the OSD trigger the short circuit, generating an instant large current so that the fuse is cutting off the internal current circuit of the battery cell.
CHARGEX® Prismatic cells are built inside of an Aluminum Shell.