I have not personally taken apart a 50kWh battery, but I'm familiar with the modules inside.

I've been using them for energy storage projects. They are 6S2P configuration, CATL cells, 2.74kWh, each with BMS PCB based on MAX17823B. Some of the latest batteries use the newer MAX17854.


mod1.jpg ...

Hi Tom,

I've taken apart a 75kWh battery. It is made of 27 modules with a 4S3P configuration for 108S. The cells are from CATL. I've attached some pictures.
The BMS is based on MAX17823B, with nine BMS PSCB in a 12S configuration.

Despite the 50kWh battery, where each module has a BMS with a ...

Hi Jamsen,

I have used the slave BMS modules and can help in this direction. But this will require some programming.
The ADBMS6815 is under NDA, which complicates the situation. Unfortunately, I cannot share the full datasheet.

My approach was to start with the code for LTC6811 and modify the code ...

A brief update that can help someone in the exact search.

I found a complete set of secondary BMS modules from the Tesla Model 3 2022 (a challenging task).
And discover that the so-called BATMAN chip is LTC833-E.
Of course, those chips don't exist in Linear's product catalog, which is now ADI ...

I'm sharing information about the MG5 LR battery I used in energy storage projects.

The 61kWh battery has a 96S1P configuration and uses giant 174Ah NMC cells from CATL.
The cells are arranged into six modules with two 8S groups.

20230323_103214.jpg

Marking on the battery module:

20230323 ...

Hi,

I am working on an ongoing project using Tesla Model 3 battery modules.
I plan to use Damien's breakout board for communication with modules and am looking for Tesla "Batman" chips.
AFAIK they have two sources: the primary BMS from the battery and the secondary BMS from the top of the modules ...

I think these sensors are NTC, probably 10k. They are used widely for temperature measurement in batteries.

Regarding Infineon MCU, I've seen the same in Pegout e208 BMU. In that implementation, the BMS gives much information, including cell voltages. More info in this thread: https://openinverter ...

Based on my observations, liquid cooling is not needed for this application. This battery can handle 10kW without problems, and the temperature increases by a few degrees. Here, I talk about 400V configuration, but with proper reconfiguration, this will be the same for an LV application.

Regarding ...

The main chip is Panasonic AN84912UA 12584040, 6 times.


What a wired BMS solution! I can't find any information about this chip.

Panasonic transferred its semiconductor business to Nuvoton. Now, there are some BMS chips:
https://www.nuvoton.com/products/battery-management/battery-monitoring ...

Do you have a pinout of the battery data connector? Without a schematic, finding proper pins won't be easy.
But I don't understand if this battery is standalone or in the car.

A few weeks ago, I attempted to reconnect the whole battery:

all_modules.jpg

This enormous battery has many wires, and I only had a day to play with it, so reconnecting was incomplete.
I've captured some logs and am sharing them. Some of the findings so far:

* The central BMS probably requires ...

Interesting BMS solution.
I suspect that communication is some variant of the ISO-SPI protocol. It usually uses a two-wire connection, and I see a small PCB in the picture with two wires and an isolation transformer. This link probably goes to the central BMS.

If you can give me the part number of ...

I guess that the board over the cell looks like this:

bms1.jpg

There are four wires between each module, but they are only communication (RX and TX pairs). The cells power the balance PCB.
It's possible to reconnect all modules (18) to the central BMS and to get cell data. Some people try to do ...

Probably, those are the same modules used in Peugeot e-208 and other cars from the Stellantis group.

The on-board BMS is described here: https://openinverter.org/forum/viewtopic.php?t=2181.
It's possible to reuse it, but it requires some specific hardware for communication (PCB with MAX17841B).

I ...

I wanted to share the project I've been working on recently, to set up home battery storage using a Renault Zoe 52kwh pack from a scrapped car.


Nice project!
Do you have a pinout of the LV battery connector? I'm unsure whether it is the same as previous models (22 and 41kWh).
The picture looks ...

A brief update: I've started experimenting with the primary BMS regarding cell balancing.

To wake up the BMS, it needs a connection to an external CAN bus (V_CAN). There is no need to send specific data; connect a CAN adapter.
Then, the BMS supplies power to secondary modules (CSC) via dedicated ...

The BatteryEmulator is a bridge between one BMS and another. Its not really intended to be capturing cell data and acting like a BMS in of itself?


I agree with your opinion. We need some basic BMS functionality implemented in the BatteryEmulator. Some of them already exist, like a contactor and ...

I'm starting this topic as a follow-up to a conversation with forum member @usus.

We discussed the possibility of using CATL modules from Peugeot E208 (and other cars) with the Battery-Emulator project .
This project gained popularity and now supports various EV batteries and hybrid inverters.
I'm ...

I've rechecked things and can confirm that the temperature is encoded with an offset of 40, as Tom91 suggested.
We need to subtract this value to get the actual cell temperature.

I think it is possible to use fewer modules, but the number must multiplе by 3, e.g., 27,30,33, etc. Each BMS circuit is ...

Here, I will describe my findings regarding the Jaguar I-Pace battery BMS. The goal is to reuse stock BMS for the ESS project.

There is one master BMS and six secondary modules. Each secondary has two identical sections: BMS chip (76PL455ATQ) and MCU for communication. There is galvanic isolation ...

I agree that the best option is to restore the original wiring of the battery and then start analyzing.

But now, I have started exploring one of the slave modules, and the results are good so far.
It sends CAN data without any request, and I think the data contains the cell voltages and ...

I'm in the same boat, having an i-pace battery (disassembled) for the ESS project. I want to reuse the BMS and start gathering information about it.
What I found so far:

* The configuration of the BMS is one master and six slave modules, and communication between them is CAN-based.
* Each slave ...

Hi Woleg,

Nice project. I have experience connecting EV batteries to HV inverters and am interested in testing your solution.

A few years ago, I reverse-engineered a CAN communication protocol for the HV Goodwe inverter (https://github.com/yasko-pv/gw-ev). Since then, I've been running a small PV ...