Referring to FIG. 2 to FIG. 6, a fastener 80 is provided on the battery cell 400. The fastener 80 is connected to the electrode terminal 5 of the battery cell 400. A fire prevention pipeline 70 is fastened to the fastener 80, so as to fasten the fire prevention pipeline 70 to the battery cell 400, where the fire prevention pipeline 80 is configured to accommodate a fire prevention medium.

In this application, the fire prevention pipeline 70 is fastened to the electrode terminal 5. On the one hand, the fastening method of the fire prevention pipeline 70 is simplified, and fastening the fire prevention pipeline 70 becomes easier; on the other hand, the fire prevention pipeline can be fastened properly, to avoid displacement of the fire prevention pipeline in the process of thermal runaway of the battery to cause untimely fire prevention.

FIG. 6 is a schematic diagram of connection between the fastener 80 and the battery cell 400 in this embodiment.

The fastener 80 is provided with an accommodating portion, configured to accommodate the electrode terminal 5 of the battery cell 400. The accommodating portion abuts against the electrode terminal 5 to limit displacement of the fastener 80.

In a feasible implementation, the accommodating portion may alternatively be constructed to have an opening through which at least part of the electrode terminal 5 is exposed.