from chemistry to pack
The Venting and Physics of Thermal Runaway pages describe cell venting qualitatively: gas builds up inside the cell, a burst disc or crimped vent opens once a threshold pressure is reached, and hot gas and electrolyte aerosol are ejected. This post works through the same event quantitatively, how fast the gas actually leaves the cell … 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: Dominic Pascal Förstermann, Akkuracy Battery chemistry choices affect everything from product safety certifications to insurance and procurement decisions — yet the common viewpoint remains “LFP is safe, NMC is dangerous.” But is that actually true? This article looks at the empirical data. In order to describe the safety aspects fully, it is split into … Read more
Authors: Antonio Garcia Martinez, Carlos Micó, Imad Elkourchi, and Jaime Martín CALBET (CALorimetric Battery Energy Tool) is an in-house thermodynamic model developed at CMT – Clean Mobility & Thermofluids, Universitat Politècnica de València (UPV) to analyze the thermal runaway (TR) behavior of lithium-ion cells under accelerating rate calorimetry (ARC) conditions. The model has been designed to provide a fast, robust, and … Read more
Electrolyte detection is a possible way of seeing early cell failures where a soft vent results in electrolyte being vented and dispersed into the pack volume. This soft venting of electrolyte happens prior to a cell going into thermal runaway. Liu et at [1] look at the development of an electrolyte sensor that measures Ethyl … Read more
When we look at the triggers of thermal runaway we have the nail test, overcharge and external heater. All of these are reasonably easy to define and apply. However, they don’t truly replicate the failure that they are meant to and that is a rogue metallic particle inside the cell. Cell Internal Short Circuits Although … Read more
Integrating Pressure Relief and Breather Devices for Overpressure Mitigation for battery safety. Author: OsecoElfab The rapid growth of Li-Ion batteries in various industries, including electric vehicles, portable electronics, and renewable energy storage has thrown a spotlight onto a critical battery safety concern: thermal runaway and its potential to trigger overpressure explosions. Managing Thermal Runaway To … Read more