Battery box series connection structure

The invention provides a battery box series connection structure, which comprises a cabinet body, a wire slot, a main control box and a plurality of layers of cases, the wire slot, the main control box and the plurality of layers of cases are arranged in the cabinet body, the main control box is arranged close to the top of the cabinet body, the plurality of layers of cases are arranged below the main control box, and the plurality of layers of cases are arranged in the cabinet body. The wire duct is arranged on one side of the main control box and one side of the machine box. The adjacent cases are connected in series through soft copper bars; the main control box is connected with the case close to the main control box through a negative electrode copper bar; the master control box is connected with the first copper busbar through the positive electrode copper bar. The main control box is connected with the second copper busbar through the N-pole copper bar; and the first copper busbar and the second copper