Battery Module Design: Cell Selection, Busbars, and Safety

This document provides a comprehensive guide to the design and selection of components for battery modules in energy storage systems. It covers the evaluation of battery cells including cylindrical 18650, 46800, soft-packed, and square case types, with a focus on LFP chemistry. Key parameters such as capacity (280Ah, 314Ah), voltage (3.2V), rate performance, operating temperature range, and safety tests per GB36276-2024 are detailed. The module design section addresses structural, thermal, electrical, and safety aspects, including end plate materials (PA66+GF30%, aluminum alloys), insulation sheets (PC, PET, EVA, PU, silicone foam), steel and plastic straps, and foam selection between cells. Foam selection criteria involve gap, preload force, bulging force, and overpressure, with stress-strain curves and CAE simulation for structural integrity. The document also outlines busbar design, voltage/temperature acquisition schemes, and protection against thermal runaway, ensuring robust and safe battery module performance.