Underbody for electric vehicle

An underbody for an electric vehicle, comprising:

• a multiply divided battery mounting portion enabling multiply divided and selective mounting of batteries, and forming a portion of the underbody;
• and
• an underbody portion connected to the battery mounting portion and forming another portion of the underbody,
• wherein the multiply divided battery mounting portion comprises:
• an upper floor member and a lower floor member defining a battery sliding mounting space;
• and
• a plurality of floor cross members bonded between the upper and lower floor members with predetermined intervals therebetween, and defining at least one battery mounting space, for maintaining strength,
• wherein the underbody portion is a reinforcing underbody portion comprising at least a partial extending portion,
• wherein the reinforcing underbody portion comprises a front and rear side member bonded to and extending from both sides of a multiply divided battery mounting portion provided as a floor portion, the front and rear side member comprising an extending portion formed on at least a portion thereof for reinforcing strength, and
• wherein the side member is bonded to either side floor cross member provided on the multiply divided battery mounting portion provided as a floor portion, and comprises a curved portion for reinforcing strength against bending and a horizontal portion for mounting auxiliary components, and
• the extending portion is provided at the bonding portion of the floor cross member.