What is the Best BMS for LG Chem batteries?

Batteries, Chargers, and Battery Management Systems.
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Lonewolf   10 µW

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What is the Best BMS for LG Chem batteries?

Post by Lonewolf » May 07 2019 8:32pm

These LG Chem Modules are Used... They were purchased from Tech Direct.
https://www.techdirectclub.com/lg-chem- ... h-2-6-kwh/
The original voltage: 60.8 (3.8V/cell).
Voltage now averages about 59V.

I would like to put these in an EV.
I plan on a series parallel configuration. 6 in series for 360V in parallel with another 6 to increase the Ahr from 40 to 80Ahr. it will be used with a Siemens 5W13? motor (Ford Electric motor). I'll use a RMS DX100 capable of 300Arms continuous (regen will be used). I'll also be using a PFC30 30A charger.

Yewsuck has had experience with these units and suggested a Chargery BMS. However, his configurations were quite a bit different than mine. (Thanks for the Help yewsuck!!!)

I was interested in some of the new bluetooth BMS's on the market now. However, I am concerned that they will have an issue with the high voltage or current I will be using.

Does anyone have a suggestion on the best BMS for this application?

yewsuck   10 mW

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Re: What is the Best BMS for LG Chem batteries?

Post by yewsuck » May 08 2019 10:03am

I sure hope some of the great Gurus on this board can help this gentleman. He is still learning and needs your help. He is trying to build a 96s2p system for an auto conversion. Each module is 16s ,hence, 6 modules of 16s with another set parrelled. The chargery i am using with my system only goes up to 24s, so i use three for my 96s system. I am using my batteries in a quite different use. He needs a BMS that can monitor and might need a BMS that can handle and display 96s and is more auto friendly. Thank you guys.

yewsuck   10 mW

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Re: What is the Best BMS for LG Chem batteries?

Post by yewsuck » May 14 2019 3:49am

LoneWolf,
This forum is more tailored toward E-Pedal Bikes and E-Mopeds. This is a great site, but not always the best fit for your E-Auto questions. You might check out this tread on another great site that might be more appropriate for your build.

Here is the link.
https://www.diyelectriccar.com/forum ... 00295.htm

swo   1 µW

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Re: What is the Best BMS for LG Chem batteries?

Post by swo » May 17 2019 1:00pm

anybody have to pin outs for the bms from the battery
think 15 wires out of front and 12 wires out the back??
bms would be nice but want to at least monitor each cell

thx

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liveforphysics   100 GW

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Re: What is the Best BMS for LG Chem batteries?

Post by liveforphysics » May 17 2019 2:53pm

Your build parts list seems really poorly selected with respect to cost/performance ratio.

You can buy a whole running Nissan LEAF for the price of that motor controller choice.

A wrecked Chevy Bolt would give you a 60kWh pack, inverter, harness, dash, and a 200hp motor.
You can buy a whike salvaged Bolt for less than that motor controller cost alone, and it would give you double the HP.
https://erepairables.com/salvage-cars-a ... et/bolt+ev
Each carcinogen vapor exposure includes a dice roll for cancer.

Each mutagen vapor exposure includes a dice roll for reproductive genetic defects in your children.

Each engine start sprays them into a shared atmosphere which includes beings not offered an opportunity to consent accepting these cancer experiences and defective genetics life experiences.

Every post is a free gift to the collective of minds composing the living bleeding edge of LEV development on our spaceship.

Lonewolf   10 µW

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Re: What is the Best BMS for LG Chem batteries?

Post by Lonewolf » May 21 2019 12:49pm

swo wrote:
May 17 2019 1:00pm
anybody have to pin outs for the bms from the battery
think 15 wires out of front and 12 wires out the back??
bms would be nice but want to at least monitor each cell

thx
I have a pinout from EV-West and they have connectors available for 25$ each pair (one front and one rear connector). you will have email a request as they do not have them shown on their website.

I hope this helps...

Lonewolf   10 µW

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Re: What is the Best BMS for LG Chem batteries?

Post by Lonewolf » May 21 2019 12:56pm

liveforphysics wrote:
May 17 2019 2:53pm
Your build parts list seems really poorly selected with respect to cost/performance ratio.

You can buy a whole running Nissan LEAF for the price of that motor controller choice.

A wrecked Chevy Bolt would give you a 60kWh pack, inverter, harness, dash, and a 200hp motor.
You can buy a whike salvaged Bolt for less than that motor controller cost alone, and it would give you double the HP.
https://erepairables.com/salvage-cars-a ... et/bolt+ev
I would agree. I started this project/hobby in 2006. there were almost no AC motors available at that time. I got a really good deal on NOS Ford/Siemens motor and slowly acquired more of the system over the years as I restored my Vette in parallel.
3 years ago, I had my system assembled. however, I needed to troubleshoot my motor issues. the battery pack (marine deep-cell batteries) froze, broke the casings and leaked acid all over the place. this was quite a setback and I have slowly built up a SLA pack to bench test my motor. now that I got it working, I decided to upgrade from SLA (1020 lbs) to the LG chem (480 lbs)...

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liveforphysics   100 GW

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Re: What is the Best BMS for LG Chem batteries?

Post by liveforphysics » May 21 2019 2:06pm

In 2006, the parts you've got would be great. In the last 13years, a LOT has improved!
It's kinda like if you started a computer build in 2006, and then 13 years pass, then you would need to re-consider the part choices and performance objectives in the project.
Lonewolf wrote:
May 21 2019 12:56pm
liveforphysics wrote:
May 17 2019 2:53pm
Your build parts list seems really poorly selected with respect to cost/performance ratio.

You can buy a whole running Nissan LEAF for the price of that motor controller choice.

A wrecked Chevy Bolt would give you a 60kWh pack, inverter, harness, dash, and a 200hp motor.
You can buy a whike salvaged Bolt for less than that motor controller cost alone, and it would give you double the HP.
https://erepairables.com/salvage-cars-a ... et/bolt+ev
I would agree. I started this project/hobby in 2006. there were almost no AC motors available at that time. I got a really good deal on NOS Ford/Siemens motor and slowly acquired more of the system over the years as I restored my Vette in parallel.
3 years ago, I had my system assembled. however, I needed to troubleshoot my motor issues. the battery pack (marine deep-cell batteries) froze, broke the casings and leaked acid all over the place. this was quite a setback and I have slowly built up a SLA pack to bench test my motor. now that I got it working, I decided to upgrade from SLA (1020 lbs) to the LG chem (480 lbs)...
Each carcinogen vapor exposure includes a dice roll for cancer.

Each mutagen vapor exposure includes a dice roll for reproductive genetic defects in your children.

Each engine start sprays them into a shared atmosphere which includes beings not offered an opportunity to consent accepting these cancer experiences and defective genetics life experiences.

Every post is a free gift to the collective of minds composing the living bleeding edge of LEV development on our spaceship.

flat tire   1 MW

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Re: What is the Best BMS for LG Chem batteries?

Post by flat tire » May 21 2019 3:49pm

I say scrap it all and get some worthwhile hardware. 15 years ago it was interesting to have any EV at all just because they were so rare. That time has long passed so why put effort into making something redundant and lame?

If you see things differently and have a good use for the car then by all means go ahead, but consider this point of view when figuring out your objectives.

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x.l.r.8   100 W

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Location: Toronto and Cambridge

Re: What is the Best BMS for LG Chem batteries?

Post by x.l.r.8 » May 28 2019 11:44am

Same pack, same configuration, I rebuilt the modules so instead of 1p 16s they are 2P 8S with a connector on each module to Check them easily. 16 model S BMB’s onto a custom BMS to control them. The modules have 4 10k thermistors so comparable with the Tesla BMB’s but obviously only room for 2 per BMB, I am yet to decide on what ones I will actually read. The problem will always be cooling but I’m running the p85s motor and for short durations. The pin out diagrams are available, the plugs I have found on cnconnections.com but it’s probably easier to swap the plugs out for something off the shelf or make fly leads to plug directly onto your bms. I don’t think they are going to be readily available as the modules are replacement packs for the recalls before they found out the BMS was at fault, hence why the odd cell is out of balance. Most modules are fine but some will have a cell well out of balance.
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