A lower box of a power battery and a design and manufacturing process thereof

Abstract

This invention relates to the field of power battery manufacturing technology, and discloses a lower casing for a power battery and its design and manufacturing process. The casing includes a stainless steel frame with a liquid cooling plate and a bottom protective plate sequentially arranged at its bottom. The stainless steel frame comprises a sleeve side beam and an electrical compartment side beam. The sleeve side beam is formed by bending to create at least three side walls of the stainless steel frame. The electrical compartment side beam is connected to the sleeve side beam to form the outer frame of the stainless steel frame. The sleeve side beam is manufactured using a tube rolling process, resulting in a simple cross-sectional structure, low manufacturing cost, and short development cycle. The lower casing uses bending technology at its boundary corners, reducing welding and thus minimizing deformation caused by welding. The overall structure of the lower casing is stable, with a high first-pass yield, reducing the frequency of manual rework, good corrosion resistance, and lower manufacturing costs.

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