CLOSURE PLUG ASSEMBLY, CASE AND RECHARGEABLE BATTERY

The invention relates to a sealing plug arrangement (1) for sealing a combined filling and degassing opening of an accumulator, wherein the sealing plug arrangement (1) comprises at least one valve part (2), one valve holder (3) and one sealing plug (4), wherein the valve part (2) is arranged on the valve holder (3) and forms an openable valve mechanism (16) with the valve holder (3) for sealing at least one interior space of the accumulator from the surrounding area upon pressurization, wherein the sealing plug (4) comprises at least one fastening means (7)) for fixing to the filling and degassing opening and at the same time subjecting the valve part (2) to a pretensioning force toward the valve holder (3), characterized in that the valve holder (3) comprises at least one extension (6) axially projecting toward the valve part (2) which is formed as a circumferential sealing edge on a surface (5) facing the valve part (2) on which the valve part (2) rests. The invention further relates to a housing for an accumulator as well as an accumulator.