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Nickel Strip vs Fuse Wire
#1
Hi All

Just something that's been bugging me. Does nickel strip have a fuse rating?

Ie. These are direct replacement for fusing wires? If not what protection exists as an alternate?
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#2
Typical nickel strip's current rating will be way higher than the needed values for sensible individual 18650 cell fusing.
You might be able to use thinly cut strips, eg 2mm wide.
Have a read here: https://endless-sphere.com/forums/viewtopic.php?t=95517
Crimp Daddy likes this post
Running off solar, DIY & electronics fan :-)
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#3
Fuses have fuse ratings.

Anything that is being used as a fuse which isn’t actually a fuse, is basically a use at your own risk type thing.  You have to test it yourself to find the rating.  Even if you are using thin wire or resistor legs, the length of the wire matters from fuse to fuse.  This is why in real fuses you see an enclosed and pre-determined blow area.

Just my opinion, but if you want a fuse, use a real fuse.  I also agree with what was said above.



Even a wrench can be considered a “fuse”… just have to test it to see what it’s rated at.

[Image: MFH2ci7.jpg]

stevelectric likes this post
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#4
Thanks to the second part of my question. Given the cross sectional area of generic designs which employ nickel strips I doubt the function includes fusing but merely a conducting surface which can be rapidly deployed by a spot welding. In this case where is the fusing within the system. How would one stop the battery bank being overloaded beside a potential trip switch inline which is governed by the rated design amperage.
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#5
I would venture to guess that an extremely large amount (probably 95%+) of battery packs built don’t employ cell level fusing.  That concept appears to have been made popular by Tesla, but their cells from what I understand don’t have a CID for safety either.

Cell level fusing isn’t even something I concern myself with… most of the industry doesn’t use it.

If you want to stop your battery bank from being overloaded, just do what the rest of the industry does, and just add a PACK LEVEL FUSE.

There is also so much cell level using does not protect from, and also adds so much additional complexity, that it becomes somewhat fragile in its own right.  I also feel this has a lot to do with how a pack might be constructed, but its a design consideration which you can make yourself depending on what you are trying to accomplish.
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#6
With respect, i have a slightly different opinion about what can be used.
Imho you dont need a exact ratio of the fuse, you just need a fuse which open on the case of several Cells concentrate their current on one shorted cell.
The range is just so that it should hold the max current you draw per cell, and should burn above that as long as the shortened/damaged cell can take it.

What i use is Teflon wire like
https://yiweike.en.alibaba.com/product/3..._wire.html (not the correct diamater ! Just the type)
where i have an old version which is silver coated. It opens on 5-7 Amps, which is 2C for a cell, i load far below that.
1 kWp in Test
4 kWh battery target - plus Mobile Home battery
Ultra low cost
Electronics ? No clue. Am machinery engineer.
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