Hi,
I charged my 36v 20AH triangle battery pack last week. I switched off the charger at the mains and as I pulled out the 5.5mm charger plug from the inline socket on the battery charge lead there was a crackling sound and flash which lasted a couple of seconds. My hand was covered in soot and the outer part of the inline socket had vaporised. The centre pin also seems to have melted. Externally the thin charge cable seems fine and the battery remained at room temperature.
My guess is that when the charger was unplugged it shorted the centre pin of the barrel socket to the outer case and struck an ark which was in part fueled by the plastic casing of the connector ( the charger plug was sooty but otherwise undamaged).
I am now stuck. My father was a TV and I am reasonably competent around pre surface mount electronics. LiIon batteries scare me given the high currents, the available energy stored and the potential for cells to become unstable at 150 degrees. I have a fully charged battery that I am mindful not to shock in case the socket is mechanically unstable and shorts again.
I have contacted the chinese supplier who "helpfully" suggested that I replace the inline charge socket but unhelpfully have not responded with when I asked how.
Can anyone help with the following:
Assuming that I still have volts on the charge lead, will I have damaged the BMS and if so how can I tell?
How do I go about replacing the charge socket
- dismantle the battery and disconnect the BMS from the cells?
- Carefully cut through the lead with a separation of 2cm between each cut in the + & - conductors?
I am thinking about replacing the barrel socket with an XT30 female connector - is this sensible?
I would like to insert fuses into both the charge lead on the battery and the battery lead to the motor.
I am having problems locating suitable DC rated fuses (42v DC). Does anyone have any recommendations for a 5A fuse in the charge lead and 25A in the power lead I assume that the power load is inductive and charger is a resistive load?
Thanks in advance for any assistance.
Robert
I charged my 36v 20AH triangle battery pack last week. I switched off the charger at the mains and as I pulled out the 5.5mm charger plug from the inline socket on the battery charge lead there was a crackling sound and flash which lasted a couple of seconds. My hand was covered in soot and the outer part of the inline socket had vaporised. The centre pin also seems to have melted. Externally the thin charge cable seems fine and the battery remained at room temperature.
My guess is that when the charger was unplugged it shorted the centre pin of the barrel socket to the outer case and struck an ark which was in part fueled by the plastic casing of the connector ( the charger plug was sooty but otherwise undamaged).
I am now stuck. My father was a TV and I am reasonably competent around pre surface mount electronics. LiIon batteries scare me given the high currents, the available energy stored and the potential for cells to become unstable at 150 degrees. I have a fully charged battery that I am mindful not to shock in case the socket is mechanically unstable and shorts again.
I have contacted the chinese supplier who "helpfully" suggested that I replace the inline charge socket but unhelpfully have not responded with when I asked how.
Can anyone help with the following:
Assuming that I still have volts on the charge lead, will I have damaged the BMS and if so how can I tell?
How do I go about replacing the charge socket
- dismantle the battery and disconnect the BMS from the cells?
- Carefully cut through the lead with a separation of 2cm between each cut in the + & - conductors?
I am thinking about replacing the barrel socket with an XT30 female connector - is this sensible?
I would like to insert fuses into both the charge lead on the battery and the battery lead to the motor.
I am having problems locating suitable DC rated fuses (42v DC). Does anyone have any recommendations for a 5A fuse in the charge lead and 25A in the power lead I assume that the power load is inductive and charger is a resistive load?
Thanks in advance for any assistance.
Robert