The invention discloses a novel high-energy-density battery which comprises a shell, positive plates, negative plates, side negative plates, a negative bus-bar and a positive bus-bar. A plurality of parallel single grids are arranged in the shell, the positive plates and the negative plates are sequentially inserted into each single grid, the side negative plates are inserted into the left side and the right side of each single grid, the positive plates, the negative plates and the side negative plates in each single grid are spaced by partition plates, the U-shaped partition plates wrap two large surfaces of each positive plate, the top surfaces of the positive plates are connected with the positive bus-bar, the positive bus-bar is connected with one end of a positive terminal, the other end of the positive terminal extends out of the top surface of the shell, the top surfaces of the negative plates and the side negative plates are connected with the negative bus-bar, the negative bus-bar is connected with one end of a negative terminal, and the other end of the negative terminal extends out of the top surface of the shell. The novel high-energy-density battery has the advantages of low internal resistance, unique structure, high energy density and capacity increase.