BMW i3: CFRP Life Module Vehicle Structure

Realizing a 50% weight reduction compared to steel with a RTM molded monocoque structure

2017/04/17

Table of contents

Summary
The BMW i3’s unique skeletal structure
Resin transfer molding (RTM)
CFRP panels are joined with bonding agents to form the monocoque body
Reinforcement with aluminum panels where necessary, parts joined with both bonding agents and bolts
Exterior parts attached to the outside of the CFRP frame
Life and drive modules attached via aluminum die-cast parts with both bonding agents and bolts

Summary

　BMW’s i3 EV features a CFRP monocoque cabin. Unlike autoclave molding used for F1 racecars and other purposes, the i3 utilizes RTM molding, which significantly reduces the time needed for the CFRP molding process. RTM molded monocoque bodies have been used in premium sports cars and limited edition vehicles, but BMW’s i3 is the first to feature an RTM molded monocoque body in a production vehicle. This report will cover the structure of the CFRP life module featured in the i3 and describe its characteristics. It was generated by MarkLines in cooperation with the Detroit-based vehicle benchmark engineering company Munro. Munro produces reports based on teardown analyses of various vehicles. The company scrutinizes detailed specifications such as the weight and dimensions of various parts, as well as costs. For detailed information,

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