Connection structure for battery module, battery module and method of connecting terminals of battery modules

The present invention relates to a connection structure for a battery module with a short circuit prevention function, a battery module and a method of connecting terminals of battery modules. An intermodule connector (100) has a nut (105) fitted in an opening (104) of a bus-bar plate (7), and an O-ring (102) fitted in a groove (108) formed in a top portion of a hollow portion (103) of a bus-bar cover (8), and a collar (101) placed on the O-ring (102). The collar (101) is fixed by a bolt. Before the collar (101) is fixed, a space (107) is formed between the collar (101) and the nut (105) by the O-ring (102). In addition, by screwing the bolt into the nut (105), the O-ring (102) is pressed, and the space (107) disappears.