Continental Structural Plastics Introduces Patent-Pending Clip System to Improve Assembly, Serviceability of EV Battery Enclosures

February 08 (2021

Continental Structural Plastics (CSP), along with its parent company Teijin, has introduced a patent-pending clip system that replaces the need for bolts in the process of joining the top and bottom of an electric vehicle battery case. This clip system improves the seal, reduces assembly costs, and makes the batteries easier to service when needed. The clips will be manufactured at CSP Stamping in Manchester, Michigan.

These steel clips affix to the company’s multi-material battery enclosure via molded-in features instead of using secondary machined holes and welds to join the top and bottom sections of the box. Unlike a point load created by using a bolt, these clips spread the seal load more evenly across the upper and lower flange. On CSP’s multi-material battery enclosure, 68 clips designed to hold 3 PSI of internal pressure replace 72 bolts that would all need to be torqued to a specified value. Each clip provides 950 Newtons of clamp force.

These clips are just one of the many innovative features of CSP and Teijin’s full-sized, multi-material battery enclosure consisting of a one-piece composite cover, one-piece composite tray with aluminum and steel reinforcements, and a mounting frame utilizing a structural foam for energy absorption. This enables a reduced frame thickness and weight, while improving crash performance.

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