High voltage battery component and method of assembling a high-voltage battery component

A high-voltage battery component for an at least partially electrically driven vehicle, said high-voltage battery component comprising:

• a connection device for connecting at least one coolant line to a heat sink of a high-voltage battery,
• wherein the connection device includes:
• (i) at least one connection part, which is connectable to the heat sink, wherein the connection part has at least one connection part channel through which coolant can flow,
• (ii) at least one sealing element arranged at the end of the connection part for providing a seal between the connection part and the heat sink, and
• (iii) at least one spreading part positioned at least partially within the connection part channel, the spreading part being which is-movable relative to the connection part between an insertion position and a sealing position, and
• wherein, in the insertion position, the spreading part (a) does not spread the sealing element radially outward and (b) blocks coolant distributed by the coolant line from entering at least a portion of the connection part channel,
• wherein, in the sealing position, the spreading part spreads the sealing element radially outward such that the sealing element is configured to be placed in a sealing manner against the heat sink when the connection part is plugged into the heat sink,
• wherein, in the sealing position, the spreading part permits coolant distributed by the coolant line to enter the connection part channel for passage to the heat sink.