Battery Module

Abstract: The present invention relates to a battery module having improved stability by delaying, through a separation structure having a form that is easy to fasten, the spread of flame and high-temperature gas between cells or cell stacks by heat generated inside, and having improved structural rigidity so as to prevent structural deformation and collapse by heat. The battery module according to the present invention comprises: a cell stack in which a plurality of cells are stacked; and partition walls disposed between adjacent cell stacks to separate the cell stacks from each other, wherein the partition walls comprise: a horizontal partition wall which has a horizontal fastening space extending in a height direction, and has an inner groove which is formed on the inner side surface thereof forming the horizontal fastening space and extends in the height direction; a vertical partition wall which has a vertical fastening space disposed perpendicular to the horizontal partition wall and extending in the height direction, and includes a protrusion on a side surface thereof contacting the horizontal partition wall, the protrusion being in the form that is engaged with the inner groove, wherein the inner groove and the protrusion may be fastened to each other so as to be engaged with and fixed to each other, as a portion of the vertical partition wall is fitted into the horizontal fastening space, and a portion of the horizontal partition wall is fitted into the vertical fastening space.

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