martinbogo
commented
3 years ago I'll be honest -- if you have a battery with 0V that has been that way for a long time -- it's VERY LIKELY that the batteries have leaked, and that your BMS will have suffered damage/corrosion from the electrolyte. This is the case with almost every single 0V / cracked cell battery I have analyzed. I've done about 50 over time, so it's pretty statistically certain.
The code I've provided is a tool to help you determine the status of a pack... and let you dump interesting information about cells to determine which cell group might be bad in a mostly-ok pack, or the overall state of a pack.
To quote Miracle Max from The Princess Bride:"With all dead, well, with all dead there's usually only one thing you can do." ... "Go through the pockets and look for loose change."
Although it's painful because the batteries aren't cheap -- you should refill this pack ONLY if the BMS looks absolutely clean. If you give the BMS 12V to the activation pin, and use the i2c bus to read it, you should still be able to read diagnostics... however there is a state the BMS can enter which disables itself ( red light blink ) which you may not be able to recover from.
On Fri, Jan 29, 2021 at 9:14 AM urx notifications@github.com wrote:
Hello. I have a Segway XT with completelly dead batteries - 0V, cracked cells and so on. I am in a half way of ordering new cells for it, but I know nothing about BMS state, may be BMS is broken too. With this project can I communicate with BMS without battery pack? Can I use regulated power source to turn BMS on somehow?
PS: This is very interesting project! Can I participate somehow? I have 2 dead batteries, oscilloscope, a lot of microcontrollers (stm32, stm8, atmega, raspbery and so on), logic analyzer and soldering station. May be I can be of use :)
PPS: sorry for my poor english )
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urx
Hello. I have a Segway XT with completelly dead batteries - 0V, cracked cells and so on. I am in a half way of ordering new cells for it, but I know nothing about BMS state, may be BMS is broken too. With this project can I communicate with BMS without battery pack? Can I use regulated power source to turn BMS on somehow?
PS: This is very interesting project! Can I participate somehow? I have 2 dead batteries, oscilloscope, a lot of microcontrollers (stm32, stm8, atmega, raspbery and so on), logic analyzer and soldering station. May be I can be of use :)
PPS: sorry for my poor english )