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36.0 10.0 25.0 6.38 MB

Firmware for Battman BMS

Home Page: http://raphaelchang.com/#projects/bms

License: GNU Lesser General Public License v3.0

Makefile 1.62% Objective-C 3.82% C++ 15.16% C 78.17% CSS 0.03% HTML 0.13% Batchfile 0.01% Shell 0.01% Assembly 0.50% FreeMarker 0.56%

firmware embedded-software battery-management-system

battman-firmware's Introduction

Battman Firmware

Firmware for the "battman" battery management system.

Setup

Clone repository.

git clone https://github.com/raphaelchang/battman-firmware.git

Compiling

You'll need to install the following gcc arm cross compiler.

Mac OS

brew tap PX4/homebrew-px4
brew update
brew install gcc-arm-none-eabi

Ubuntu

sudo apt-get install gcc-arm-none-eabi

To build the files, navigate to the root of the repository and run the following:

make

Programming

You'll need to install dfu-util v0.9 or higher.

Mac OS

On Mac, the homebrew version is adequate.

brew install dfu-util

Ubuntu

On Ubuntu 14.04, dfu-util must be installed from source. See instructions here: http://dfu-util.sourceforge.net/build.html.

Uploading code

Plug in Battman to computer via USB.
Ensure that nothing is connected to the discharge output of the BMS.
Enable bootloader mode by reseting the board while the bootloader button is held down.
Ensure that no other boards are connected that are also in bootloader mode.
Run the following to build and upload the code. make upload

battman-firmware's People

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battman-firmware's Issues

Feature TODO List

Charger voltage calibration

Fix inconsistencies between output voltage setpoint and actual output voltage

Data logging to flash memory

Log data (SOC, current, voltage, etc.) to flash memory chip (v4.2+)

Periodic wake using RTCC alarm

Determine how long battery pack left unused
Discharge cells to storage level after long period
Reset alarm on every shutdown

Power-on through switch

Configurable switch hold times for power-up and shutdown

Charger profiles

Different charge settings for different charger voltages

Buzzer configuration

Set buzzer trigger events
Set buzzer sounds

missing hw_conf_v4.2.h

hw_conf.h:13:26: fatal error: hw_conf_v4.2.h: No such file or directory
#include "hw_conf_v4.2.h"

LTC6803 hardware support

SPI interface
Read and store cell voltages
Cell balancing

Precharge routine

Turn on precharge FET before main discharge FET
Monitor rising of output voltage to determine when precharge is complete
Prevent turning on into short circuit by checking for output voltage rising above threshold within few milliseconds

Cell voltage level protection

Cut off discharge when any cell is over-discharged
Warn user when cell is low
Warn user and send CAN message when cell is overcharged

Report status over CAN

Various battery statistics
Faults
Shutdown events

CAN hardware support

Support reading from and writing to CAN bus

State-of-charge tracking and estimation

Implement SOC tracking algorithm using coulomb counting from current measurements
Update SOC using voltage limits
Update battery capacity and state-of-health

Buzzer hardware support

Hardware support for buzzer on v4.1+

Connecting charger with powered off bms problem

When i connect the charger while the bms is powered off, the lights start flashing green very fast, and nothing is responsive. Using the switch or connecting the USB port gets the bsm out of this weird loop and turns on.

Current monitoring and protection

Report current from current monitor
Handle overcurrent interrupt and shutdown discharge

Accessory support

Options for various accessories (LED, WS2812, segment display, LCD display, buzzer, etc.)

Cell balancing routine

Bleed off higher voltage cells after charging above a certain threshold
Synchronize with charge routine

Dashboard interfacing

Configuration through dashboard
Data visualization
Firmware updates

Charger supply overcurrents even when current controlled

When the charger supply's current limit is <6A and is very close to the output voltage, the current limit in the supply gets tripped and turns off.

Battery temperature protection

Protect battery from over-temperature events using NTC connected to LTC6803

False charger input detection on startup

Charger voltage is detected on startup even when charger is not plugged in

Discharge turns on for a short period on power-on

Current controlled charge routine

Current controller using current sensor as feedback and voltage as output
Three charging modes (current-controlled boost, current-limited boost, bypass)
Cut off at CV completion (boost mode) or fully charged voltage (bypass mode)
Precharge at very low battery voltage
Synchronize with balancing routine
Check for correct charger input voltage

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