Help with 10s3p 18650 pack layout (5×6 or two 5s3p blocks)

[prayoga]

Hi everyone,
I’m planning to build a 10s3p battery pack using 18650 cells. My layout idea is either:

• a 5 rows × 6 columns arrangement (compact, not too long), or
• two separate 5s3p blocks placed side by side.

I’ve drawn a draft layout (see image attached). My question is about how to connect the two 5s blocks in series:

• Should I just use a single nickel strip connection between the blocks?
• Or is it better to use 3 parallel wires/nickel strips (similar to the way the parallel groups are normally connected), to ensure even current distribution?

I want to make sure the connection is safe and that current sharing is balanced between cells. Any advice, examples, or references from people who already built a 10s3p pack with this type of layout would be really helpful.

Thanks in advance!

 

[docw009]

In my opinion, your layout will work. There will be a potential choke point on the long connection that connects six cells. Builders use several methods to address that. The usual way is to stack three layers of nickel across all six cells, That could be three equal length strips 6 cells weid. or a 6 cell, a 4 cell, and a two cell strip, all centered. Another is to attach a length of copper across the six cells. Either use copper wire or copper strip, In this case, no need to get fancy by welding a sandwich, Just carefully solder it down in six places.





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