Resources

>

Technical Briefs

>

Power

>

Why should engineers use flexible multilayer busbars instead of rigid ones in electric vehicle (EV) inverters?

DIRECT ANSWER

Flexible multilayer busbars are used instead of rigid ones in EV inverters because they provide superior vibration and shock absorption, accommodate thermal expansion, and fit into tight, curved spaces while maintaining high electrical conductivity.

EV and HEV power connections demand excellent vibration and shock absorption. The compact, Flexible Multilayer Busbar design handles the demanding requirements of your applications, such as power distribution in inverters. 

A tough design consisting of multiple foils welded to a solid mounting maintains flexibility for easy bending and a solid fixing, making these busbars extremely durable and perfect for applications where heavy vibration or pronounced thermal expansion occurs. Furthermore, high conductivity lamels provide high power transmission, offering improved electrical conductivity with robust mounting strength and increased power efficiency.

How Do Flexible Busbars Protect Inverters from Vibration and Shock?

The flexible component of these busbars consists of multiple foils welded to a solid mounting, which maintains flexibility for easy bending and a solid fixing for tough conditions. This tough design makes the busbars extremely durable and perfect for applications where heavy vibration or pronounced thermal expansion occurs.

Can Flexible Busbars Handle Pronounced Thermal Expansion?

Vibration absorption, thermal expansion, and assembly tolerance: the compact, Flexible Multilayer Busbar design handles the demanding requirements of your applications, such as power distribution in inverters. The flexible component of these busbars consists of multiple foils welded to a solid mounting, maintaining flexibility for easy bending and a solid fixing for tough conditions.

How Do Flexible Designs Navigate Complex Geometry and Space Constraints?

The compact, Flexible Multilayer Busbar design handles the demanding requirements of applications, such as power distribution in inverters. The flexible component of these busbars consists of multiple foils welded to a solid mounting, maintaining flexibility for easy bending and a solid fixing for tough conditions. Flexible busbars are highly customizable, and their greater flexibility means that they can fit in small, tight, or curved spaces without compromising mounting strength. Furthermore, this flexibility provides greater shock and vibration absorption while offering improved electrical conductivity.

Why Do Flexible Busbars Maintain High Power Efficiency and Secure Mounting?

This battery busbar is made out of layers of copper foils, or stacked copper or aluminum lamels, which are tightly attached to mounting areas using a process called diffusion welding. While the ends are rigid to enable connections and provide a solid fixing for tough conditions, the middle of the busbar is kept flexible for easy bending. Furthermore, high conductivity lamels provide high power transmission and, in turn, increase power efficiency.

The Bottomline

Flexible multilayer busbars are the top choice for high-vibration and space-constrained EV inverter applications. Choosing flexibility over rigidity allows engineers to significantly enhance the durability and efficiency of their powertrain systems while solving complex thermal and mechanical challenges. These components provide the robust durability required for the demanding lifecycle of a modern electric vehicle.

Contact ENNOVI today to discover how our specialized consultation and flexible busbar technologies can optimize your next inverter design for maximum reliability.

Have a specific project in mind?

Our application engineers work on BTS and BTP programmes across global EV OEM and Tier-1 projects. Tell us your pack architecture and current profile and we’ll recommend the right bus bar approach.

DOWNLOAD

Bus Bar Selection Guide

ENNOVIโ€™s full material selection guide for HV bus bars โ€” Al, Cu, laminated, and flexible options with specification data.

Coming Soon

HAVE A SPECIFIC PROJECT?

Speak to an Application Engineer

Our engineers work on BTS and BTP projects across global EV OEM and Tier-1 programmes

Brief details

Portfolio

Power

Products

Bus bars (Al/Cu, laminated, flexible), SealTech, BusMate, HV Connectors, Overmoulded Bus bars

Buyer stage

Early Design & Integration

Author

ENNOVI

Last updated

June 2026

Other engineers also read

Continue exploring Power and Energy technical briefs

Discover ENNOVI Technical Lens

Explore engineering insights, technical perspectives, and practical solutions across Battery Interconnects, Power, and Signal applications.

Before using this website, please read and accept our Terms of Use and Privacy Notice.