A Lithium Ion Battery Management System

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This modular BMS uses Bluetooth Low energy to get rid of wires.

michel-kuenemann

Michel Kuenemann

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Balancing video
05/26/2017 at 12:38 • 0 comments

This 2 minute footage shows balancing in progress.
Explanations are embedded...
Conclusion: balancers validated...
15 balancing modules installed this evening
05/21/2017 at 20:50 • 1 comment

I managed to finish the assembly of the balancing cards today and I installed them seamlessly on the battery modules. The result is really cool. Performance tests are in progress.

General view of the 10 kWh string:
Each (70-element) module is equipped with a balancing card placed on top of it. This card continuously measures the module voltage and starts to dissipate power whenever the module voltage crosses a certain limit (can be setup up to 4.2 Volts).
A close up on the modules
The first things to notice are the "large" 60 x 60 x 10 mm fans. Thanks to them, each module is capable of a 50 watt continuous power dissipation. The square components with a black on white hexadecimal figure on them are the BlueTooth Low Energy modules (Zentri AMS001). Each BMS card is managed by an NXP LPC824 Cortex M0+ microcontroller featuring a very clean 12 bit ADC, among many other cool things.