Battery cell comprising a housing covering plate having a raised central region

A battery cell (1′), comprising:

• a coil element (3) comprising a coiled stack (5) comprising a first film, coated with anode material, a second film, coated with cathode material, and two plastic films acting as diaphragms,
• an electrolyte,
• two current collectors (7, 9), of which one is electrically conductively connected to the first film and one is electrically conductively connected to the second film,
• a housing (11) having a metallic container (13) and a metallic cover arrangement (15),
• wherein the container (13) has an opening (14), through which the coil element (3) and the two current collectors (7, 9) are configured to be introduced into the housing (11) during manufacture of the battery cell (1′),
• wherein the cover arrangement (15) has a one-piece covering plate (23′) and closes off the opening (14) of the container (13) in a gas-tight and pressure-tight manner,
• wherein a leadthrough arrangement (25′) is formed on the cover arrangement (15) for passing through, in a gas-tight manner, electrically conductive contact arrangements (19′), which are each in contact with one of the current collectors (7, 9) in the interior of the housing (11), through the covering plate (23′) out of the housing (11),
• wherein the covering plate (23′) has a central region (33) and a peripheral region (35) surrounding the central region (33), wherein the central region (33) extends above the opening (14) of the container (13) a first distance from the coil element, whereas the peripheral region (35) extends within the opening (14) of the container (13), and
• wherein the peripheral region (35) forms a channel (37) which reaches inwards into the opening (14) at a second distance from the coil element, and a border region a third distance from the coil element, the second distance shorter than the first and third distances, wherein the channel has a u-shaped cross-section.