BH Emotion batteries
BH Easy Motion 36V and 48V batteries: BMS design, repair, and rebuild guiides
BH battery and BMS types
We can use our smart SOC boards for all the bananas, and the non-Brose plastic flat ones. We neve...
'Banana' 36V/48V
Comes with at least 3 different types of BMS. Almost always 36V, but some are 48V. The 48V charge...
Rebuilding 48V Flat
Module layouts The group 1 is the one furthest away from the BMS. With the 'old method' before...
Learning about 48V chargers
Some types of chargers for the 48V BH battery show that one of its pins seem to be different than...
BH 48V metal
Uses 20700 cells, not 18650. Rare, problematic.
Companion board development
Instead of designing a whole new BMS, we just designed a companion board that communicates to the...
Avoiding hangups
Problem description We see that the smart SOC boards can 'hang up' either by themselves, or if t...
Basic idea: SoC indication hack
The BMS makes a 0-10V signal, that is interpreted by the display as state-of-charge in a linear w...
Troubleshooting: Output oscillations
The SOC output had a lot of noise on it, causing the displayed percentage on the display to move ...
Brose BH hack
Mapping the pins Compared to black: only noise everywhere Compared to brown: Orange: 9.72V...
DC/DC converter and LDO evaluation
The single most expensive components in our boards are the RECOM DC/DC converters. 55 kr/pcs. Ou...
Finding the PCB connectors
For the very final version of the BH board, we need to integrate all connectors that make it comp...
Interface pinouts
Flat with white BMS board Orange wire No GND path to the connector, then no NTC taken to the ...
Flat 36V batteries with green 'sandwich' BMS
These BMSs have the LEDs and the button built in, not on a separate board - making our life more ...
Installing the v6 board
Three known problems The ZXTR2012Z voltage regulator cannot handle the battery voltage suddenl...
Initial planning for companion boards
One tiny board of 4 cm times 2 cm with 3 terminals: Battery positive Battery negative SOC ou...
Test procedure for early prototypes
After assembly, each board needs to be tested and approved before it may be used in a battery. Th...
Troubleshooting broken companion boards
Three boards 76, failed in Stale's battery in the field - does not run LEDs, SOC output is wro...
Understanding the LED boards
White board The most simple design. This board consists of 5 LED's with series limiting resistor...
AVRDUDE and the 328PB chip
Generally, it has always been a headache to upload to 328PB chips using the Arduino IDE interface...
Avoiding sparking when connecting companion board
When the smart SOC board is attached to the battery, it can produce a decent spark: High (30-6...