1. Measure and cut nickel strips: Determine the required length of nickel strips based on your cell configuration (parallel, series, or combination). Cut the strips accordingly. Contact online >>
1. Measure and cut nickel strips: Determine the required length of nickel strips based on your cell configuration (parallel, series, or combination). Cut the strips accordingly.
2. Spot weld the nickel strips to the 18650 cells: Using your spot welder, carefully weld the nickel strips to the positive and negative terminals of each cell. Ensure a solid connection.
3. Arrange the cells in the desired configuration: Based on your project’s voltage and capacity requirements, arrange the cells in a parallel, series, or combination configuration.
4. Connect the cells using the spot-welded nickel strips: Carefully connect the cells together using the spot-welded nickel strips, following your chosen configuration.
1. Use a multimeter to measure the voltage of each cell individually.
2. If there are significant differences in cell voltages, you’ll need to balance them using a dedicated cell balancer or the BMS itself (if it has balancing capabilities).
3. Follow the manufacturer’s instructions for the balancing process.
1. Choose the right BMS: Select a BMS that’s compatible with your cell configuration and meets your project’s requirements (e.g., charge/discharge rates, voltage limits).
2. Connect the BMS to the battery pack: Carefully follow the manufacturer’s instructions to connect the BMS to your assembled battery pack. This typically involves soldering or using specialized connectors.
3. Secure the BMS and battery pack: Place the BMS and battery pack inside a suitable enclosure or casing, ensuring proper ventilation and heat dissipation.
1. Connect to a suitable charger or power supply: Use a charger or power supply compatible with your battery pack’s voltage and current requirements.
2. Perform initial charging and monitoring: Carefully monitor the charging process, checking for any abnormalities or signs of overheating.
3. Test under different load conditions: Once fully charged, test your battery pack under various load conditions to ensure proper performance and capacity.
1. Storage: Store your battery pack in a cool, dry place when not in use. Avoid extreme temperatures and humidity.
3. Troubleshooting: If you encounter issues like low capacity, overheating, or BMS errors, consult the manufacturer’s troubleshooting guide or seek professional assistance.
Most of us know the basics of building packs of lithium-ion batteries. We’re familiar with cell balancing and the need for protection circuitry, and we understand the intricacies of the various serial and parallel configurations. It’s still a process that can be daunting for the first-time pack-builder though, because the other thing that most of us know about lithium ion batteries is that getting things wrong can cause fires. Rule zero of hackerspaces is “Don’t be on fire”, so what’s to be done? Fortunately [Adam Bender] is on hand with an extremely comprehensive two-part guide to designing and building lithium-ion battery packs from cylindrical 18650 cells.
In one sense we think the two-parter is in the wrong order. Part two takes us through all the technical details and theory, from lithium-ion chemistry to battery management systems and spot-welding nickel busbars, while part one shows us the construction of his battery pack. There are also a couple of videos, which we’ve placed below the break. It’s still not a job for the faint-hearted, but we’d say he’s produced about as professional and safe a pack as possible.
If spot welding worries you then it might be possible to build a pack without it. But it’s always worth considering: would you be better served buying one?
It’s always dangerous when you have more than 1 lithium cell without a fuse. All it takes is for one of them to go bad, enter a low impedance state, then the other battery discharges through it causing a fire or explosion.
With more batteries comes higher likelihood of failure, but with only 2 batteries you can also cause a fire. It seems like most young hackers don’t seem to understand or care about the consequences of sticking even a few 18650 batteries together.
Those young whipper snappers and all there electronic gizmos are going to start the neighborhood on fire. They should stick with gasoline.
I had a 36 v go in my small shop, took 2-5lb, 1-10lb and 1-20lb to finish putting it the fire and explosion. The biggest headache was cleaning the shop of extinguisher powder. And how did all that powder get into all my drawers ?
I love watching proper solder joints.
This lands perfect on my feed right when I’m trying to rebuild my scooter battery for air travel.To anyone that perhaps can share their knowledge or feedback, I want to turn my cilindrical 5.4AH 36V 10S2P 18650 pack, into a 3D printed, removable cell for 5AH 10S1P 36V 21700. Any thoughs or suggestions for this endeavor?
le sigh, my want for an actual write-up and not more video. I get that this is how people make money now a days but it makes it so hard for the viewer to find the relevant information to them.
Seconded here.I know that it is more work to photo and document a project properly, but i use most of my references like this as a quick reference guide to search for that one detail I couldnt remember when I needed it.
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