Williams Engineering Touts Dual-Chemistry Battery

U.K.-based Williams Advanced Engineering Ltd. is developing a next-generation battery that uses two types of lithium-ion cells, which the supplier claims will eliminate tradeoffs between energy and power density.

A proof-of-concept model of the so-called Adaptive Multi-Chem system teams Samsung cylindrical cells that provide good energy density with higher-power A123 pouch cells. Initial testing indicates the design can increase energy density by as much as 37% and cut weight by 30%.

The company presented the technology at this week’s Cenex LCV show in the U.K. The 60-kWh display unit weighs just 345 kg (760 lbs).

The architecture packages the two types of cells in separate modules within the battery. Each pack has its own bi-directional DC/DC converter to control energy transfer between the two cell types.

Pouch cells typically release energy faster, which enhances acceleration but depletes range. In the dual-chem design, high-density cylindrical cells can top off the pouch units as needed.

Williams aims to begin small batch prototype manufacturing of the new battery within the next year. Initial applications are expected to focus on electric hypercars, race cars and aerospace applications.

The battery module also features an exoskeleton manufactured using Williams’ “223” lightweighting technology. The design enables rapid, low-cost composite production and the use of recycled materials that yields an exceptionally high strength-to-weight ratio, according to the supplier.