Battery mounting structrue and method thereof

PURPOSE: A battery mounting structure for a vehicle and a method thereof is provided to easily arrange battery decking holes in a vehicle decking hole, to improve assembly workability by simplifying the mounting work, and to reduce production cost of the vehicle. CONSTITUTION: A battery mounting structure for a vehicle comprises a decking hole on the vehicle body, a battery decking hole, and a decking pin(11). The decking hole of the vehicle body is formed in the vertical direction of the vehicle body(1). The battery decking hole is formed in a battery system(5) which is connected to the lower part of the vehicle body and is arranged in line with the decking hole of the vehicle body. The decking pin is formed in a mounting jig(9) which lifts up the battery system by supporting the lower part of the battery system and is installed to penetrate the decking hole of the battery and the decking hole of the vehicle body.