Author: BenjaminNelson via YouTube
Go to Source
I build a lithium battery using 7 Nissan Leaf cell modules, some threaded rod, and an Ikea cutting board!
Please click SHOW MORE!
Chapter Points:
00:00 Introduction
3:01 Stacking the cells and BMS overview
11:16 Installing the circuit board bus-bar panel
13:41 Installing components on top – BMS, Fuse, Cables
21:15 Laser-cut cover
22:47 Carrying handles
24:49 How to Charge
27:29 How we’ll use the battery
28:07 Closing thoughts
VOLTAGE:
Is this pack really 48 Volts? No. We often use a "shorthand" when referring to the voltage of a battery system. 12/24/48V were numbers originally based on lead-acid batteries. Lithium cells run at a different voltage. More properly, we often refer to how many cells are in series (s) and how many are in parallel (p).
This battery would be a 14s2p arrangement. (Remember, there’s 2 in series, 2 in parallel inside each module!)
Maximum theoretical charged voltage on this battery would be 58.8V.
CAPACITY:
These first generation Leaf modules were originally rated at 500 watt-hours each. Seven of them times .500kWh is a theoretical 3.5kWh capacity. Of course, these are older batteries, and that doesn’t account for degradation. I’ll have to run a full draw-down discharge test to know the real-world capacity.
BMS:
A BMS is a Battery Management System.
Lithium cells are extremely sensitive to over-charging and over-discharging. A BMS monitors the voltage of individual cells to make sure the voltage of a single cell doesn’t go too high or too low. It will equalize the voltage between all the cells. Some BMSs can also remotely control the battery charger, or have other features.
For more on BMS, please see the BMS section of Micah Toll’s "DIY LITHIUM BATTERY" Book:
https://amzn.to/3am8tbb
I bought the BMS from Tech Direct: https://www.techdirectclub.com/battery-and-back-up-storage/new-category/
Here is a simple charger which would be appropriate for this battery: https://www.techdirectclub.com/battery-and-back-up-storage/new-category/
If you like what I do you can support me at:
https://www.patreon.com/300MPG
By shopping at Amazon anyways: www.amazon.com/shop/benjaminnelson
For more Information, visit:
https://300mpg.org
Components used in this video
Alligator Test Leads: https://amzn.to/3iZLpCO
Stainless Hex Cap Screws: https://amzn.to/3agHptH
Electronics Stand-offs: https://amzn.to/3agHptH
Most Popular Playlists:
Build Your Own Electric Car: https://bit.ly/2zMufmN
Build Your Own Electric Motorcycle: https://bit.ly/2AT7eOF
Solar Garage: https://bit.ly/2KgQpS5
Contact Ben Nelson:
Please just leave a comment for me at: https://300mpg.org/about/
and I’ll get right back to you.
Music by:
"Shaving Mirror" Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 3.0 License
http://creativecommons.org/licenses/by/3.0/
As an Amazon Associate I earn from qualifying purchases. Amazon links help support this these videos.
Thank you for your support!