Apparatus, systems and methods for implementing flow cages and flow cage assemblies in association with high pressure fluid flows and fluid valves are provided. Flow cages and flow assemblies are provided to dissipate the energy of a fluid flow, such as by reducing fluid flow pressure and/or fluid flow velocity. In some embodiments the dissipation of the fluid flow energy is adapted to reduce erosion, such as from high-pressure jet flows, to reduce cavitation, such as by controllably increasing the flow area, and/or to reduce valve noise associated with pressure surge.

A high-voltage battery component includes a connection device for connecting a coolant line for a coolant to a heat sink of a high-voltage battery. The connection device has a connection part, which is connectable to the heat sink, and a sealing element arranged at the end of the connection part for providing a seal between the connection part and the heat sink. The connection device includes a spreading part, which is movable relative to the connection part. The spreading part, by pushing into the connection part, can be transferred from an insertion position for inserting the connection part into the heat sink into a sealing position. In the sealing position, the spreading part spreads the sealing element radially outward such that the sealing element can be placed in a sealing manner against the heat sink when the connection part is plugged into the heat sink.