Structural element, a battery housing assembly and a vehicle

A structural element for an energy storage system battery housing configured to house at least a first battery cell stack, the structural element having a longitudinal extension along a longitudinal direction, a width extension along a width direction and a height extension along a height direction, the structural element comprising:

• a venting channel with an extension in the longitudinal direction, the venting channel forming a space configured for transport of cell ejecta from the at least first battery cell stack;
• and
• at least a first supplemental channel in the longitudinal direction, the at least first supplemental channel forming a space configured for containment of phase change material, PCM,
• wherein the at least first supplemental channel is separated from the venting channel with at least a first shared wall configured to at least partly rupture when exposed to a temperature above a temperature threshold and/or a flow of matter at a velocity above a velocity threshold.