Isothermal Terminal Calibration for High-Current Cell Testing
Active isothermal terminal calibration eliminates contact heat injection during high-current cell testing, preventing false capacity and cycle life data.
Prismatic Cell Terminals
Meaning
External connection points integrated into the rigid top cover of a rectangular battery unit to facilitate electrical integration. Prismatic cell terminals are designed to withstand the mechanical torque of bolt-on busbars or the heat of laser welding. Their heavy construction supports high current densities in heavy duty applications.
Structural Attachment
Mechanical stability is provided by anchoring the metal posts into a plastic header or ceramic insulator. This arrangement prevents the prismatic cell terminals from moving during vibration or shock. Protection against leaks is achieved through gaskets and compression seals that maintain the internal pressure.
The design must account for the expansion of the internal jelly roll which can apply upward force on the terminal assembly.
Contact Resistance
Efficient power transfer depends on the cleanliness and flatness of the mating surfaces. Oxidation on the prismatic cell terminals can lead to localized heating and voltage drops during operation. Technicians often apply conductive grease or plated coatings to ensure a low resistance path.
Assembly Method
Automated production lines use these fixed points for rapid pack construction. Because the prismatic cell terminals have a known position and height, they allow for precise robotic alignment. This repeatability reduces the risk of assembly errors in large battery systems.