Battery short circuit protection

Using Arduino General Electronics
1

Dear forum members,

I need some information regarding the battery short circuit protection. I have a 48V lithium-ion battery, connected to it is a battery management system named the (TinyBMS 150A version). Link to the BMS is here. I want to perform a short circuit test of my battery but I am afraid that this short circuit will destroy the BMS. The manual of the BMS says that the BMS or the terminals of the battery should be avoided from a short circuit. My question is how can perform the short circuit test without damaging the BMS. The BMS of course is an expensive device. I am planning to use a fuse with the specification given below:

ESKA: 220.045L
Rated voltage: 125V
Rated current: 15A
Breaking capacity: 300A @ 125Vdc
Switch-off characteristic: Fast
Melting integral, (I²t): 103.5 A²s

Will this fuse be fast enough to protect the BMS from damage? The rated current of the fuse is 15A, while the maximum output current from the battery for the load would be around 10A.

So, my question is using this fuse or any other fuse would be capable to protect the BMS or should I look for some other way? A schematic of the battery with BMS is attached. Looking forward to handy comments. Thank you very much.

Regards,

schematic
schematic1024×768 110 KB

2

So just - don't! :grin:

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:smile: for the certification, I have to :stuck_out_tongue:

4

With a battery like that I would include a fuse between the middle cells. The point of the fuse is to protect against the very high currents the battery can produce, which can quickly start a fire.

5

Well, if it is about certification than you need to run a far deeper analysis. Just running a test and hoping everything will work fine, and, if it does, to conclude that it will also in the future for any production unit is not a ... hm, hm, ... professional approach in doing this.

I think what you need to do is to get deeper understanding of the BMS (how it operates, used parts including their data, ...), in which environment your product shall work (e.g. temperature range?) and show first that - based on design - the product will survive a short circuit. And then you can run your test with limited amount of fear that something gets destroyed.

6

For certification you have to expect to lose a few units to destructive testing, surely?

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