from chemistry to pack
Battery packs run on direct current, and that single fact makes their contactors, fuses and connectors behave very differently in a fault than the AC switchgear most electricians train on. The Arcing page touches on why DC arcs are harder to break; this post goes into the physics behind that difference and what it means … Read more
A simple creepage and clearance calculator, providing indicative minimum distances based on IEC 60664-1:2020 and ISO 21498:2021 table lookups with linear interpolation. It does not replace formal insulation coordination analysis by a qualified engineer. Always verify against the applicable standard for your specific application and jurisdiction. BatteryDesign.net accepts no liability for design decisions made using this tool. … Read more
Lithium-ion batteries are the backbone of modern electric vehicles (EVs) and energy storage systems, but their high energy density comes with severe safety risks. The primary threat is thermal runaway (TR), an uncontrollable, self-sustaining chain reaction where a battery’s heat generation vastly exceeds its ability to dissipate heat. During TR, internal temperatures can rapidly escalate … Read more
When a lithium-ion battery cell experiences thermal runaway (due to mechanical intrusion, defects, or electrical abuse), it releases a superheated, highly pressurized gas plume containing vaporized electrolyte and carbon particles. This gas behaves as an electrically conductive fluid. In conventional battery packs, if this gas vents randomly into the pack cavity, the blasting hot airflow … Read more
Author: Jim Phillips, P.E Introduction At present, no consensus standard provides a validated methodology for calculating direct current (dc) arc-flash incident energy. IEEE 1584-2018, IEEE Guide for Performing Arc-Flash Hazard Calculations, is limited to alternating current (ac) systems and does not address dc arc-flash. NFPA 70E includes personal protective equipment (PPE) category tables applicable to certain … Read more
The Current Interrupt Device (CID) in a cell is designed to electrically disconnect a cell if the internal pressure increases beyond a design point. If the gas pressure increases further the burst disc breaks and the gas is vented. However, is the CID operation safe under High Voltages (HV)? As the CID opens the circuit … Read more