Housing part of a battery cell or for a battery cell and method for applying a rupture element to a housing part of a battery cell

A method for applying a rupture element to a housing part of a battery cell, the method comprising the steps of:

• making available the housing part, wherein the housing part has an inner side facing an interior of the battery cell and an outer side facing an exterior of the battery cell, and a hole in the housing part, via which hole, in the event of a malfunction in which an increase in pressure above a threshold occurs in the battery cell, pressure can escape into the surroundings,
• providing a plate-shaped rupture element which is at least larger than the hole;
• and
• applying the plate-shaped rupture element from the outer side onto the hole in such a way that it covers completely the hole;
• and
• causing the hole to have has a leakage rate that is at most 5*10−6 (mbar*1)/s by connecting an edge region of the plate-shaped rupture element all around to an edge region, extending around the hole, of the housing part in such a way that the plate-shaped rupture element closes off the hole in a fluid-tight fashion, wherein the plate-shaped rupture element has at least one material weakened portion, so that in the event of the malfunction the connection between the plate-shaped rupture element and the housing part tears at the weakened portion.