In this video, we showcased a high-density battery management system (BMS) in a 40x40mm form factor for a 3-cell tabless 18650 Li-ion battery pack using a BQ77915 and a pair of highly efficient MOSFETs from Infineon, pictured below. It was able to maintain within safe temperatures during a ~50A discharge for more than 60 seconds. In a following video, a ‘360Wh/kg semi-solid state’ battery pack was tested and evaluated against its datasheet ratings, and we provided some commentary on the progress of solid-state battery technology.
Example design: Battery protection system section of BMS X based on BQ77915EVM-014 reference design
A large portion of our battery knowledge is from Battery Mooch and Pajda on Patreon who we could highly recommend for anyone wanting to know the latest news on practical battery tech.
To do
- create a versatile, robust, and modular active balancing circuit
- make an easy to use cylindrical battery recycling system which helps solve the issue of leftover nickel / copper chunks while keeping the steel plating intact / restoring it
- implement fuel gauges and programmable battery monitors with the newest battery cells using high nickel cathodes, silicon-composite anodes and/or modified voltage ranges
- create an ‘active’ battery cycle life tester that efficiently converts power instead of wasting it
- look into using GaN FETs as power switches for their increased power density and surge robustness