| CPC H01M 50/244 (2021.01) [H01M 50/236 (2021.01); H01M 50/249 (2021.01); H01M 50/258 (2021.01)] | 20 Claims |

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1. A casing of a battery comprising:
a first beam, provided with a groove on its surface;
a second beam, arranged on a side of the first beam provided with the groove, and the first beam and the second beam being configured to define a space for accommodating a battery cell; and
a connecting assembly, configured to connect the first beam with the second beam, and at least a portion of the connecting assembly being arranged inside the first beam and the second beam, wherein
the connecting assembly comprises a first connecting member and a second connecting member, the first connecting member comprising a first portion and a second portion, and the second portion extending from a surface of the first portion towards a direction away from the first portion;
the first portion is connected to the first beam through the second connecting member, at least a portion of the second connecting member is accommodated in the groove, and the second portion is connected to the second beam through the second connecting member;
the first portion is accommodated within the groove, and fixed at a bottom of the groove through the second connecting member; and
the first connecting member further comprising a third portion, which is connected to the second portion and configured to connect with a region other than the groove on the surface of the first beam provided with the groove.
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