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I think there are different opinions on this. One of my projects uses pico-fuses in this capacity. Upside is wire protection. Downside is the hassle if one pops. I've not had any problems.

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Do fuses need to be installed on the battery taps at the battery to protect wiring to the BMS and/or for safety? Newb here.
My take, BMS is usually treated as part of the finished battery.

Never heard of any fusing balance leads, usually max 3-4A current, 18AWG.

If I were pushing that, using balance leads for unattended "node charging" some do 8A supposedly, maybe? but I wouldn't, I pay attention charging any LI chemistry

a temp sensor cutting off the charger's input would be a better solution anyway.

Now the power pair is a different story, sure put a good quality over sized under rated fuse on the positive wire near the post

especially if the wiring is long and or exposed to shorting in an accident.

A master switch to isolate the pack for when messing around is a good idea too.

I do not trust CBs much, good ones at high amps cost the earth.

But all these extras also add resistance, complexity, more points of failure

so most people KISS and take their chances
 

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Discussion Starter · #5 ·
Already plan to fuse the positive leg on each battery box, plus a service disconnect per box, contactor on positive and negative legs for redundancy and an inertia switch somewhere in there. I have experience with pcb manufacturing so I was thinking of building a board internal to the battery box with connectors to each battery module for thermistors and taps, and integrating pico fuses into that board. Just wasn't sure if it's necessary.
 
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