Structural Batteries Poised to Change Car Design
Emerging structural battery composite materials could drive the next era of automotive design, according to a Scintillation Research report. This technology integrates batteries into a vehicle's frame, potentially reducing weight and improving efficiency. The analysis covers materials, manufacturing processes, and future technology trends in the space.
- The global structural battery market is projected to expand from USD 170.19 million in 2024 to USD 808.24 million by 2032, demonstrating a compound annual growth rate (CAGR) of 21.50%. Another forecast estimates the market will grow from USD 243.1 million in 2025 to USD 923.2 million in 2032, reflecting a CAGR of 21%. - Tesla has been a key player with its structural battery pack, first announced at its Battery Day event. This design, which integrates 4680 battery cells directly into the vehicle's chassis, aims to reduce the number of parts and the overall mass of the battery pack, thereby improving vehicle efficiency and range. For the Model Y, this approach resulted in a 10% weight reduction and a 14% increase in range. - Researchers at Sweden's Chalmers University of Technology have been pivotal in advancing structural battery technology. In 2021, they developed a structural battery with performance ten times higher than previous prototypes. Their work utilizes carbon fiber as a negative electrode and a load-bearing material. The goal is to reach an energy density of 75 Wh/kg and a stiffness of 75 GPa, comparable to aluminum. - Volvo has also explored structural batteries, participating in a European Union research project. The project developed a material blending carbon fibers and a polymer resin that can be molded into car panels like the trunk lid and plenum cover, which were tested on a Volvo S80. Replacing existing components with this material could reduce a vehicle's total weight by over 15%. - The World Economic Forum recognized structural battery composites as one of the top ten emerging technologies in 2025. These materials combine the mechanical strength of composites with rechargeable energy storage, allowing them to serve as both a power source and a structural component. - Automakers Hyundai and Kia are jointly working on a patent for a structural battery assembly that integrates the battery directly into the vehicle's structure to use space more efficiently and increase battery capacity. - Stellantis has been active in the battery space through various partnerships. In December 2024, Stellantis and CATL announced a joint venture to build a lithium iron phosphate (LFP) battery plant in Spain with an investment of up to €4.1 billion. However, in February 2026, Stellantis sold its 49% stake in the NextStar Energy joint venture to LG Energy Solution for $100 amid a reported pivot away from electric vehicle production. - Key materials used in structural battery research include carbon fiber for the negative electrode and lithium iron phosphate (LFP) for the positive electrode, with a fiberglass fabric separating them. This design avoids conflict metals like cobalt and can reduce the overall weight by eliminating the need for heavy current collectors like aluminum and copper.
