| CPC H01M 50/204 (2021.01) [H01M 50/267 (2021.01); H01M 2220/20 (2013.01)] | 13 Claims |

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1. A battery module comprising:
a cell assembly including a plurality of secondary batteries; and
a module housing in which the cell assembly is disposed,
wherein the module housing includes at least two frames coupled to one another, the at least two frames being configured to change a length of the module housing according to a size of the cell assembly, and
wherein each of the at least two frames has a coupling groove into which a part of an adjacent one of the frames is inserted, and an insertion portion which is inserted into the coupling groove of the adjacent one of the frames.
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