Patent ID: 9178251
Filing Date: 2015-11-03
Classification: H01M,Y02E,Y02P

Abstract:
1. A button cell having a housing closed in a liquid-tight manner comprising a cell cup, a cell cover and a seal wherein, the cell cup has a base, a circumferential casing, an edge area connecting the base and the casing, and an end cut edge curved radially inwardly such that an internal diameter of the casing of the cell cup decreases toward the cut edge, the cell cover is inserted into the cell cup with the cut edge in front such that the casing of the cell cup and the casing of the cell cover at least partially overlap and form a circumferential double-walled casing area, the cell cover has a base, a circumferential casing, an edge area connecting the base and the casing, and an end cut edge, the casing of the cell cover comprising a circumferential segment in the area which overlaps the casing of the cell cup, which segment widens radially outwardly and has an external diameter greater than the internal diameter of the casing of the cell cup in the area of the cup edge which is curved inwardly, the circumferential segment is an end segment relative to the cut edge of the cell cover or starting from the cut edge in a direction toward the base of the cell cover, the seal is arranged between the cell cup and the cell cover between the overlapping casing areas such that they are isolated from one another, at least one hole passes through the casing of the cell cup in the area which overlaps the casing of the cell cover, and the cell cup and the cell cover are moveable against each other in the axial direction to dissipate any overpressure within the cell.