9V battery positive soldering pad went off from my circuit board
Why it happened:
Too much heat or a cheap pcb, caused the copper pad to delaminate from the board. Your bad solder joints show that you aren't soldering correctly, which is likely 70% of the problem.

What Prevents it from happening:
Practice proper soldering techniques. Use a suitable, clean, hot iron in quick/short contacts with good solder. Invest in rosin. Multiple attempts to solder the same joint will cause delamination, so measure twice cut once. 

How to fix it once it happens:
The pad itself can't be fixed. Instead,  Solder to another or multiple points of the board at the same node. If the copper pad bridged two sides of the board, then you have to connect the wires to both sides to do it properly.