fuses ! ... xmmmmmmm ????

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paraskevas

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if fuses in each cell is sooooo important ! , why battery packs on ebikes , ecars they have a single fuse per pack ?

i think ... i can spot weldening all my 80p ( packs ) and i ma going to fuse them per pack and not each cell !!!!! :idea: :idea: :idea: :idea: :idea: :idea: :idea: :sleepy: :sleepy: :sleepy: :sleepy: :sleepy: :sleepy: :p :p :p :p :p
 
SimonW said:
paraskevas said:
if fuses in each cell is sooooo important ! , why battery packs .... ecars .....
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ecar? You mean, like the Tesla?

Hmmm, what does Tesla do?
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i mean electric cars .... think this ..... a battery pack in electric car .... that have thousands little fuses .... in its gap at the road ... battery broke down ... too much fuses is madness not safety !!!!!!!!!!!!!!!! .. xexexexexe ( exaple : oh no gap at the road : result broken fuse , etc , etc )

sorry for my english
 
[ATTACH said:
8949[/ATTACH]
SimonW pid='14136' dateline='1505802184']
i mean electric cars ....
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Yes... nevermind.

I'm not getting your point.
What do you mean by 'gap at the road'?
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Tesla have fuses on each cell on their batteries.


It all depends on the type of cell and how safe you want it to be
 
Another common problem is corrosion, poorly hardware, low quality cells, weak/too tiny nickel strips.
 
Depends on the size of the pack. Say you have an 100p pack, if a cell goes short circuit it would be exposed to all the current the other 79 cells could deliver, would easily exceed300a. That's 900 watts. It will explode, unless the CID saves it, but the heat generated may still be enough to make a cell catch fire.

However an ebike battery is not nearly as big. So therefore the danger is significantly less.
 
If someone wanted to limit their number of fuses you'd probably have to drop cell count to like 10-20p per fuse. Seems easier to just fuse each cell to the bus bar.

Fuses in cars are not really a problem, since every car i've seen has fuses on all circuits except maybe alternator to battery (charge current) and domestics seem to not fuse battery to starter for cranking. The Toyota's I've worked with have fuses on everything. Not really a direct compare to the high power of a huge battery bank, but for the most part fuses don't fail as often as they actually blow from an issue.
 
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