1. Mid-Point Disconnect (Lock-out-tag-out)
The mid-point disconnect box is a safety feature for voltage and current management. By turning its switch, half of the battery string current is cut off from the rest, so there is no physical path for the current to run across the entire system.
There is also an optional locking mechanism to allow only qualified users to operate the box.
These switches cut-off electrical power, help protect against electrical fires and theft, provide power shutdown during maintenance, and protect batteries from power drain.
Electric Power Systems’ EPiC battery modules are modular, scalable, and application-agnostic. The EPiC battery family offers energy, power, and ultra power modules to meet any application need.
3. Battery Management System
Each battery system is managed through Electric Power Systems’ certifiable battery management system. The battery management unit provides management, monitoring, detection, and communication features to ensure optimal battery system performance.
- Electric Power Systems offers single, double, and triple string battery management units (BMU) based on battery system configuration
- The core of the BMU is a processor, software control, and communications system.
- Electric Power Systems’ battery management systems (BMS) are qualified to DO-160, DO-254, DO-178, (DAL-C)
- Using its foundational work performed on NASA’s X57 program, Electric Power Systems has deployed numerous battery management systems for all-electric and hybrid-electric aircraft applications.
- Electric Power Systems battery management systems’ requirements reflect considerations for high voltage, multi-string, all-electric/hybrid-electric aircraft (e.g., monitoring, safety, controls, communications, etc.).
BMS Core Components
1. Battery Management 2. Network Management 3. HVDC Protections 4. HVDC Communications 5. Active Sensing 6. Cell Pack
EPiC Module Solutions
Electric Power Systems’ EPiC battery modules can be configured to meet a large number of space claim installation requirements. Battery systems can even be split to fit specific vehicle architectures while still maintaining their electrical connections. Depending on the system architecture, battery system terminator plates will be designed accordingly.
Thermal Management and Venting
Electric Power Systems’ products are designed to meet stringent FAA safety requirements.
Each module is designed to pass FAA RTCA DO-311A, Venting category B
“Emissions are allowed to escape from the battery system only through one or more designed venting provisions that are intended to provide a sealed connection to an aircraft exhaust system.”
This means EP Systems’ advanced venting technology successfully mitigates module-to-module propagation. The module contains all energy and ejecta produced when every cell within the module experiences thermal runaway. The total energy is properly vented through the vent port and ejected outside of the vehicle.
The modules are designed to not need any additional fire containment structures and properly vent any toxic emissions.
EP Systems’ modules also feature integrated liquid cooling for proactive thermal management of the battery system.
On-board cooling is not necessary, so battery cooling features can be integrated with either an onboard reservoir or offboard reservoir.
Link to NASA X57 Venting Tests on Our Batteries: https://www.nasa.gov/specials/X57/batteries-power.html
A Solution for every application
TRAINER | THIN HAUL | EVTOL
20% PACKAGING OVERHEAD
200+ CYCLES @ 80% DoD
3C CHARGE RATES
HYBRID | EVTOL | MILITARY
23% PACKAGING OVERHEAD
2000+ CYCLES @ 80% DoD
3C+ CHARGE RATES
HYBRID | APU | REGIONAL | MILITARY
25% PACKAGING OVERHEAD
7500+ CYCLES @ 80% DoD
4C CHARGE RATES
40, 60, 80AH APU