Doubling up on the bus bars?

[RobOfYork]

EVE Lifepo4 280Ah cells. When building 12v batteries is there any benefit to using 2 bus bars instead of 1 bus bar when connecting cells? Or any known or possible downside? The bus bars I am referring to are the ones that ship with the cells.

 

[Suijkerbuijk]

Of you mean to use dubbele busbar on the the cells.
No you have to go for thicker busbar.
You can not do stable bus bar .
You gone make heat like heater

 

[RobOfYork]

Of you mean to use dubbele busbar on the the cells.
No you have to go for thicker busbar.
You can not do stable bus bar .
You gone make heat like heater

thanks. was wondering about the fine air gap between two bars. I wonder if the copper tubes that some people hammer flat and use would cause heat because of the air gap in the tube? Just curious.

 

[FilterGuy]

EVE Lifepo4 280Ah cells. When building 12v batteries is there any benefit to using 2 bus bars instead of 1 bus bar when connecting cells? Or any known or possible downside? The bus bars I am referring to are the ones that ship with the cells.

What is the max current you expect to draw from the battery compared to the rating of the bus bars? If reasonably low, there is little benefit.

Having said that, 12V systems tend to be very high current. If you are trying to drive a 3000W inverter from 12V, you could be driving over 200A continuous and much higher for surges. Doubling up the busbars might be a good idea. (I don't recommend 3000W, 12V setups for this reason)

However, Doubling the busbars probably does not double the current capability. The contact resistance between the top and bottom busbar means the top busbar will carry less current.

 

[FilterGuy]

There won't be an air gap where the busbars are bolted down to the cells, but an elivated resistance will exist.
The air gap along the rest of the distance does not really change things. If anything it creates better cooling, but if you are heating up the center of the busbars, you have big problems. Every time I have seen warm/hot busbars it has been due to poor connection at the cell terminal.