I use a lot of LIPO's in my model aircraft and have opened / repaired a couple where the balance lead has broken a wire.
I might consider trying to do what you are doing on the QT in my own garage but not wishing to sound rude there is no way in this day and age I would offer advice on this with the level of detail given and a poor quality image.
Do some more research online where others are less cautious.
As I minimum find out how many cells are in there and how they are wired i.e. a mixture of series and parallel and how they joint to the terminals we can see which MAY just MAY be part of a balance charge set up. If they are it needs an inteligent charge to deal with it.
It might pay to discharge the battery a bit first so that things get a little less exciting if you investigate the wrong bit too closely.
I may be sounding like a damp squib , sorry for that, these things can be handled safely and are not the total time bomb that some would have you believe BUT they do need respect and a deal of caution.
Good Luck Clive