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这应该是宝马首款CTB结构的电车
原文是这样的：
Pack to open body: in parallel to this, the battery housing serves as a structural component within the vehicle for the first time. The chassis has an open floor, which is closed when the high-voltage battery is installed. This pack to open body design turns the battery into a structural part of the vehicle. This construction has a positive effect on the body's torsional stiffness, thereby enhancing the car's driving dynamics. At the same time, this method allows BMW to reduce the amount of material required and cut weight as it saves the need for the additional vehicle floor fitted previously
也就是现在图中电池包面上这块就是地板，上面那几根东西就是座椅导轨支架吧
