ENOVIX BrakeFlow - Intra-Cell System
When a conventional lithium-ion battery is pierced or severely damaged, a short can occur, discharging the cell in microseconds and potentially releasing a violent and often fiery chain reaction. It’s called thermal runaway and, well, it’s bad. That’s why we created BrakeFlow™, an intra-cell system that increases abuse tolerance. It wasn’t enough to reimagine the lithium-ion battery, we’ve also introduced a whole new level of safety.
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- Enovix 3D cell architecture enables multiple parallel cell-to-busbar connections.
- This uniquely enables BrakeFlow (shown in green) - which includes a resistor with a set value - at the busbar junction.
- Under normal operation, each electrode carries a small current which results in negligible energy loss
- In the event of an internal short, BrakeFlow regulates current flux from other areas of the battery to the short, thus limiting the short area from overheating and inhibiting thermal runaway
- Test, test, and test again.
- Many in the industry use the nail penetration test to simulate an internal short. But not all tests are equal. We used a fully charged cell at 4.35V on our 100% active silicon anode battery on an insulated table, with an impact speed of 20cm/s using a 6cm long steel rod.