No chargeing after shortcurcit

[perra]

I bought a 40ah 48v battery pack with bms from Hero Power System (Aliexpress). It worked really great, until a wire got loose on the 48v input and it shortcurcit (sparks were flying..).
Now I can't charge the battery anymore. The battery is still fine, I can ride the bike. I hope to get som help before I start to mess around. Do a bms normally got a fuse for the input charging?
Can I bypass the bms to charge the battery directly, but that is probably not a good idea. If the bms has failed, can I get a new one and replace it myself?
Thanks for any help on this. I'm starting to miss riding my scooter :?

 

[dnmun]

post up a picture of your battery and the BMS. expose enuff of the battery so we can see the wiring. do you have a voltmeter? measure the voltage at the charging port on the battery with your DVM. there is normally a fuse on the charging input.

 

[perra]

View attachment 1

 

[dnmun]

if the backside is open show a picture of that too. that is a big powerful BMS compared to what most have.

use the voltmeter in your DVM set to 200V DC and check the voltage on the two outer pins in the charging plug.

let us know if there is voltage on that plug. full pack voltage.

 

[perra]

 

[dnmun]

can you measure the pack voltage at the charging plug?

the black charging wire goes through that hole in the middle and is solder to the trace underneath. there is a little section of trace running across the very bottom from that wire over to the left where it says HC1 on the other side of the trace.

is there part of that trace missing? did it burn open right there?

once you can measure we will know more. it is a fairly nice BMS using those digital control ICs. it is made to go up to 20S too. with a 4th IC in that space left open.

 

[dogman dan]

I see what you are seeing I think. That thin trace in the lower center, right hand one, near the top of the trace.

Thin trace would be the charging part of the bms.

 

[perra]

I get 50 volts on the BMS, on the charger connectors.
But I get nothing on the charger socket. So maybe bms is fine, but maybe a wire is burned between socket and bms. I will test and replace these wires.

 

[perra]

It works! It was just a cable connection that failed.
Always check the basic stuff first.
Thanks anyways guys.