Who We Are
Solid Energies Inc. (SEI) is a Southern California developer of solid-state and semi-solid lithium-ion batteries, founded in 2017. Over $10 million in R&D funding from DoD/DoW, DOE/ARPA-E, NASA, and the California Energy Commission, plus private investment, supports our 2 MWh/yr pilot line in Anaheim, with a 0.3GWh/yr pre-mass-production line designed
and planned.

Our Technology
SEI’s core technologies, protected by 10 granted U.S. patents, cover three areas: (1) polymer composite-based electrolyte and in-situ polymerized electrolyte; (2) electrolyte-infiltrated composite electrode; and (3) multi-layer, co-curing battery cell processing that is highly compatible with today’s Li-ion production lines. On this foundation, SEI develops electrolyte, cell, and pack together to provide the best combination of  safety, energy, peak current, weight, and temperature range.
‍
Products
Generation 1 Solid-State Pouch Cells‍
Cell-level performance under SEI test conditions: 320–350 Wh/kg; −30 °C to +60 °C (extended −40 °C to +90 °C range in development); >1,000 cycles; 3C charge / 5C discharge; no thermal runaway events in SEI internal testing to date.
‍

‍
Solid Master Battery Pouch Cell Flyer, 3.6V, 13Ah [PDF]‍

‍Solid Master Battery Pouch Cell Flyer, 3.6V, 28Ah [PDF]‍

‍Solid Master Battery Pouch Cell Flyer, 3.6V, 35Ah [PDF]

Generation 1 Solid-State Battery Packs
First-generation solid-state for UAVs, drones, and robots, sold through SEI's subsidiary Solid Master Battery.‍‍

About 300–340 Wh/kg at pack level (22.2 V). Charging 0.5C standard, 1C rapid, 1.5C maximum; ~500 cycles at 10C, ~800 cycles at 5C, ~1,200 cycles at 0.5C; discharge −25 °C to 55 °C (22.2 V) or −20 °C to 60 °C (24 V, 48 V), charge 0 to 45 °C.
‍
Solid Master Battery Pack Flyer, 24V, 32Ah [PDF]‍

‍Solid Master Battery Pack Flyer, 48V, 32Ah [PDF]
Go to www.solidmasterbattery.com for more detailed information, and purchasing.
‍
Custom Solid-State Battery Packs
Custom packs built from SMBC cells: voltage and capacity definition, BMS and communication requirements, mechanical packaging, and charging integration.

Defense and Aerospace Batteries
SEI's solid-state cells and packs are designed for:
- Puncture and impact resistant: designed to avoidfire when penetrated by shrapnel or small-arms fire, subject to program-specific testing.
- Wide temperature range: −30 °C to +60 °C today without active thermal management, extending toward −40 °C to +90 °C.
- Drop-in compatibility: including ongoing work on select DoD/DoW and NASA projects.
- Scalable form factors: mission-configurable for air,land and sea platforms. Battery products in development for defense include UAV batteries, 6T vehicle batteries, BB-2590 batteries, conformal wearable batteries (CWB), and stationary/mobile energy storage.

SEI has demonstrated solid-state 48 V / 5 kWh solar-storage systems through a California Energy Commission (CEC) development project, and has received product-sample orders from Airbus Defense and Space and Leonardo DRS Naval Power.
‍

Work with SEI 
- Partnerships: Advanced development for DoD and DOE, OEM partnerships, and IP licensing to manufacturing partners.
- Supply: Cells, modules, and packs from prototype to mass production.
- Development Services: Cell and electrolyte engineering, custom pack design (BMS, communication, packaging, charging), materials testing, prototyping, and scale-up planning.
- Evaluate SEI cells for your platform: Share your application, voltage, usable energy, continuous and peak current, space, weight limit, charging method, and timeline and we will recommend a configuration and share datasheets.
‍