Proterra supplies modular lithium‑ion battery packs ranging from 40 kWh to over 200 kWh for heavy‑duty, medium‑duty and off‑highway vehicles. The packs feature high gravimetric and volumetric energy density, ballistic‑grade aluminum housings, active liquid‑cooling and cell‑level safety isolation, and an embedded BMS for real‑time monitoring. Proterra also provides end‑to‑end engineering support for vehicle integration, validation and after‑sales service.
Funding
Funding not disclosed
Founders
Product
Problem
Vehicle manufacturers and equipment OEMs lack a reliable, high‑energy‑density battery solution that can meet the demanding performance, safety, and durability requirements of heavy‑duty, medium‑duty, and off‑highway applications while providing a clear path to zero‑emission operation. Integrating such batteries into diverse vehicle architectures also requires extensive engineering expertise and ongoing support.
Solution
Proterra delivers purpose‑built lithium‑ion battery packs that combine industry‑leading energy density with rugged, ballistic‑grade enclosures to withstand extreme vibration, impact, and temperature conditions. The modular, scalable platform spans 40 kWh to over 200 kWh, enabling OEMs to select the exact capacity and form factor—flat, under‑frame, or within frame rails—required for each vehicle design. Integrated active liquid‑cooling and passive propagation‑resistance safety technologies maintain uniform cell temperatures and isolate thermal events at the cell level. An embedded Battery Management System provides real‑time diagnostics, voltage and temperature monitoring, and fault detection without additional hardware. Proterra’s engineering team guides customers through vehicle design, integration, prototype build, validation, and launch, and continues to support after‑sales service, parts, and training to ensure long‑term reliability.
Target Audience
Primary customers are OEMs of heavy‑duty trucks, commercial transit buses, school buses, off‑highway equipment, specialty vehicles, and medium‑duty fleets seeking zero‑emission powertrains and comprehensive integration services.
Features
- Modular battery architecture configurable from 40 kWh to 200 kWh, supporting a wide range of vehicle classes (Class 8 trucks, transit buses, school buses, off‑highway equipment, specialty and medium‑duty vehicles).
- High gravimetric (≈178 Wh/kg) and volumetric (≈300 Wh/L) energy density achieved with top‑tier cylindrical cells for extended range and payload capacity.
- Ballistic‑grade aluminum housing with rigorous in‑house vibration, impact, and crush testing to meet UN38.3, ECE R100.03, and SAE J2929 safety standards.
- Active liquid‑cooling thermal management system coupled with passive propagation‑resistance (PPR) cell‑level isolation for safe, uniform temperature control.
- Integrated Battery Management System (BMS) with embedded sensors for real‑time voltage, temperature, and health monitoring, enabling predictive maintenance and faster servicing.
- Serviceable ancillary bay separating high‑voltage components from serviceable parts (fuses, contactors, controllers) for easy maintenance without removing the pack.
- Flexible mechanical integration options: flat pack for under‑frame mounting, compact configuration for tight spaces, and roof‑mountable designs.
- End‑to‑end engineering support covering vehicle design consulting, integration controls, prototype build, validation testing, launch assistance, and ongoing after‑sales training.