A car battery array is provided with battery blocks (2) having a plurality of connected batteries (1), a first load-bearing plate (3) on top of which the battery blocks are mounted, a second load-bearing plate (4) attached on both sides to the first load-bearing plate and covering the tops of the battery blocks, and a reinforcing rod (5) that connects with the second load-bearing plate and the battery blocks to attach the second load-bearing plate to the battery blocks. The battery blocks are disposed in a battery compartment (6) established inside the first and second load-bearing plates, which are joined together on both sides. The battery blocks are mounted on top of the first load-bearing plate and connected to the second load-bearing plate via the reinforcing rod to support the battery block load with the first load-bearing plate and the second load-bearing plate.