Cell Level Fusing

Accelonix cell wire bonding

When we connect cells in parallel to increase the capacity we might also want cell level fusing. This fusing being by definition designed to disconnect a cell that for some reason is sinking or delivering high currents. The fusing can be inside the cell and sealed or external to the cell, sometimes both internal and … Read more

EUCAR Hazard Levels

EUCAR Hazard Levels

The EUCAR Hazard Levels define the outcome of cell level safety testing. These levels are normally used to describe the outcome of tests such as overcharge as part of the cell specification. Description Description Classification Level & Effect 0 No effect No effect. No loss of functionality 1 Passive protection activated No defect; no leakage; … Read more

Thermal Runaway vs Electrical Energy

thermal runaway energy vs electrical energy for smaller cells

The energy released during Thermal Runaway versus the electrical energy stored in a battery. The energy released during Thermal Runaway (TR) versus the stored electrical energy. A number has been bandied around for a long time that the energy released in a TR event was 2 to 6 times the electrical energy stored in the … Read more

What happens when batteries are abused?

Billy Wu when batteries go wrong

Lithium-ion batteries are an essential component in electric vehicles, however their safety remains a key challenge. This video explores the science behind what happens when batteries are abused and when they fail. Starting from how a battery cell works, this presentation from Billy Wu at the Dyson School of Engineering takes you through the basics … Read more