DIOO — Battery Subsystem for CubeSats
DIOO (Deliver Integrated power On Orbit) battery sumbsystem is our early stage space battery project engineered mainly for Low-Earth Orbit CubeSats. Project initiated early 2026, ESA BIC incubation starting mid-2026.
Purpose-built for orbit
Commercial off-the-shelf battery solutions are not designed for the radiation environment, vacuum conditions, and thermal extremes of low-Earth orbit. DIOO is a proprietary battery pack with smart battery management system built from the ground up for spacecraft applications — combining space-qualified cell selection, radiation-tolerant BMS electronics, and thermal control strategies developed specifically for LEO missions.
BMS electronics designed to operate reliably through the radiation environment of low-Earth orbit.
Passive thermal design handles the extreme hot/cold cycling of LEO orbit — from direct sun exposure to eclipse shadow with each 90-minute pass.
Redundant protection circuits, cell-level monitoring, and one string failure tolerance to meet spacecraft safety requirements and range safety standards.
Board & Pack Design
BMS Board — early prototype (v0)
Battery Pack — 2S2P configurationESA-aligned testing plan
Thermal vacuum cycling across the full operational range (−40 °C to +85 °C) to validate performance in the space environment.
Total ionising dose and single-event effects testing on BMS electronics to verify radiation tolerance for the LEO environment.
Charge/discharge cycle life testing simulating LEO eclipse conditions to validate capacity retention over a ≥2-year mission life.
Sine and random vibration testing per ECSS-E-ST-10-03C to qualify mechanical integrity for launch loads.
Testing carried out in partnership with Ústav experimentálnej fyziky SAV (Slovak Academy of Sciences) and ESA BIC Slovakia facilities.
Project Status
Project Milestones
- ESA BIC Slovakia grant awardedApr 2026Done
- Project kick-offJul 2026Done
- Requirements and Architecture definition, battery cell selection & characterisationQ4 2026
- BMS prototype v1 — bench validation (TRL 3)Q3 2027
- Mechanical and thermal development. Thermal-vacuum chamber testing (TRL 4)Q4 2027
- Engineering model integrationQ1 2028
- Working and functionally tested and documented AstroBAT prototypeQ2 2028