INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Jobs

Making packs from Lipo cells which already have protection boards.

Making packs from Lipo cells which already have protection boards.

(OP)
Hi Folks,
I'm looking at making a battery pack from six of these cells:
http://docs-europe.electrocomponents.com/webdocs/1...

I need either 2 x (3 in series) in parallel or 3 x (2 in parallel) in series , to give a nominal 11.1V 4Ah.

If they were unprotected cells then I understand I'd need to be using protection / balance boards like this:
http://www.all-battery.com/pcb-11-1V-13A-32051.asp...

However these cells already have an overcharge / undercharge protection circuit built in (details are in data sheet above) and I'm unclear about how they might interact. Can I just wire up the packs (after a topping up charge of all cells to balance them)? If so, Which topology of (3 Serial )x 2 Parallel or (2 Parallel ) x 3 Series is preferable?
All info welcome!

Cheers,
Robin.

RE: Making packs from Lipo cells which already have protection boards.

The best topology for battery cells is to parallel them first and then make them series. If your cells have electronics which can not been removed, you may have some problem such as tolerances of voltage measurements or even more leakage current. Preferably it is better to use cell with no protections, parallel them ,and use a protection for all of them as one cell.

Hadoo

Design Eng at www.lianinno.com

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close