New BMS for bq76PL455A based batteries

[Volkmar]

If anyone is looking for the connector:

JST 04CPT-B1-2A

https://at.rs-online.com/web/p/kfz-stec ... er/1238228

[vanwezel]

Hi there

just saw your post on the battery's and the BMS system . BMS board with 16s li-ion battery BQ76PL455A

i have acquired 15 of this batteries with this boards on i do also have teh manage ment boxes but dont have a clu how to make this work for me ,could you please help me on how to manage these as i don't have the expertise you have on these programs please

if you would like a fe i am willing to depart with some for your help.


thanks


Louie

[Volkmar]

Hello,

quick update and hopefully someone has an idea what to do...

I now only have a cable of about 20 cm. from the battery module to the master BMS board. Since I have two strings in parallel, two mast boards were now used and communication with the Zombie VCU happens via can bus.

Charlie told me that one board needed the CAN ID 0x4f1 and the second needed the CAN ID 0x4f5. Works great! Thanks Charlie!

Something strange happens now: when the BMS is running and the wake up signal is gone, then it shuts down normally... that means after a certain time it goes into deep sleep mode.
But it can no longer be woken up from this state, only if I remove the voltage on the permanent plus, then it starts normally.
It seems as if the board gets "stuck" somewhere in the program when shutting down and can't get out of there...

[Volkmar]

Hi there

just saw your post on the battery's and the BMS system . BMS board with 16s li-ion battery BQ76PL455A

i have acquired 15 of this batteries with this boards on i do also have teh manage ment boxes but dont have a clu how to make this work for me ,could you please help me on how to manage these as i don't have the expertise you have on these programs please

if you would like a fe i am willing to depart with some for your help.


thanks


Louie

Hello Louie,

what help do you need in particular?

If you tell us exactly what you need, we will be happy to help you!

[vanwezel]

Hi there

Thank you for your reply.

I would like to use these batterys in my shed as a power source for my ham radios.
But don't know how to arrange these to a power bank as they need to be on a bms .
Each battery have a board and I have all the links
But don't know on what program or how to connect these battery's in a bank of power and then charge them on solar or with a built wind mil maybe

Any suggestion would be welcome.
They are at 58 volt now all of them. They come from a volvo electric Taxi .we're stored fir three years and was new so never been used. They are all in great condition.

Would apriciate any info. On how to utilise these as a power bank .

I have a old inverter too.


Thanks for your reply.

[Volkmar]

Hi there

Thank you for your reply.

I would like to use these batterys in my shed as a power source for my ham radios.
But don't know how to arrange these to a power bank as they need to be on a bms .
Each battery have a board and I have all the links
But don't know on what program or how to connect these battery's in a bank of power and then charge them on solar or with a built wind mil maybe

Any suggestion would be welcome.
They are at 58 volt now all of them. They come from a volvo electric Taxi .we're stored fir three years and was new so never been used. They are all in great condition.

Would apriciate any info. On how to utilise these as a power bank .

I have a old inverter too.


Thanks for your reply.

if these are the same modules as I'm using, then each module has 16 cells. That means 16 x 3.6 volts = 57.6 volts nominal voltage.
Charging limit: 16 x 4.2 = 67.2V
Discharge cutoff: 16 x 3.2 = 51.2 V

Depending on what voltage you need for your system, you can then connect the appropriate number in parallel or in series.
Parallel means plus on plus and minus on minus and so on. This doesn't increase your voltage but increases the possible amps.

Serially, vice versa means plus to minus to plus to minus etc.
This increases your voltage but not the amps.

For the exact structure of your solar system, I recommend a photovoltaic forum because there are a lot of experts there.

Thanks to the excellent work of Catfish, you can recreate your BMS via this link: https://github.com/catphish/ti-daisychain-bms

[vanwezel]

Hi
Thank you for the info much appreciated.

Can I use the existing Bms boards and how do I mange this I can send some pictures if needed I have other electronic boxes that I striped out of the original unit abd have all the relay, exectra too.
How to I wire up the existing bms units on the batteries and what program do I use on this to monitor the bms boards ?please
I can connect the batterys in series or parallel I do understand that part but what voltage do I need to go to to get best and cheapest way to use them as back up batteries wit h I will use my I veryer to 230 volt from them .

I need to know how to set this up please.?

Thank for your help I realy apriciate it .

Louie

[jrubiom74]

Hi there

just saw your post on the battery's and the BMS system, Excellent Job!

I have acquired 6 of this batteries with this boards on a EV that I'm working (VW Pick Up 1972). It's working on 360V but I need to manage the batteries and charge them.

I'm use to work with Tesla S Battery Pack and Thunderstruck BMS & EVCC but I have no clue on how to work with this Battery Pack.

Could you please help me on how to manage / charge these as I don't have the expertise you have on these programs please?

If you would like a fee I'm willing to depart with some for your help.

Thank you in advance

[catphish]

Hello everyone!

I just wanted to update this thread with some important information as I get questions about this from time to time.

First of all, to give a little background, the best way to build a BMS to work with these batteries would be to design a PCB with a bq76PL455A chip and an STM32 microcontroller. Unfortunately, when I designed my car, there was a huge problem with chip availability and this chip was impossible to obtain. What I did instead was to design my own circuit using an RP2040 and some external circuitry that simulates the operation of this chip.

This resulted in two projects, first https://github.com/catphish/lg-daisychain and then an improved design https://github.com/catphish/ti-daisychain-bms

Both versions are functional, with the second one being a major improvement. Anyone is free to build and use these boards (ideally the later version).

HOWEVER... I would strongly suggest that anyone serious about using these batteries going forward would be better off designing a new board using a genuine bq76PL455A chip which is now available.

I apologize if I haven't been very responsive in providing support for this design.

[Volkmar]

Hello everyone,

I also use the BMS provided by Charly and it works very well too! Thank you again for your work Charly!

now to my problem:
I have the following setup:
Daisychain BMS, Zombie VCU, Tesla SDU with the IO board and BMW LiM.

Unfortunately, I haven't managed to charge the batteries with a DC fast charging station yet. Has any of you already managed a charge with the BMW LiM and the BMS and maybe someone can tell me the trick?
Do I have to set a charging limit from the BMS? It is supposedly 9996 A on the display of Zombie VCU. Can you specify this somewhere or is it required for the LiM?

Second question: How do you calculate the SoC and how do you display it? Is the SoC required for a successful charge?

I hope my questions are clear and you can help me further.

Thank you and happy crafting...