Liquid-cooled heat sink head and heat sink system having the same

A liquid-cooled heat sink head, including a heat exchange portion for contacting a heat source, the liquid-cooled heat sink head comprising:

• a metal substrate, the heat exchange portion being disposed thereon;
• a first cover covering the metal substrate to form a heat exchange chamber, the first cover including a first liquid inlet and a liquid outlet to allow a working fluid to flow in the heat exchange chamber;
• and
• a plurality of heat dissipation fins disposed on the metal substrate and in the heat exchange chamber, the heat dissipation fins being disposed between the first liquid inlet and the liquid outlet and arranged sequentially from the first liquid inlet toward the liquid outlet, a liquid passage being disposed between each two adjacent ones of the heat dissipation fins, wherein at least a portion of the heat dissipation fins is connected to the heat exchange portion, at least one of the heat dissipation fins has a perforation spaced a distance from a top edge of the at least one of the heat dissipation fins having the perforation opposite to a bottom edge thereof which is connected to the heat exchange portion, the liquid passages at two opposite sides of the at least one of the heat dissipation fins having the perforation communicate with each other through the perforation, and the at least one of the heat dissipation fins having the perforation is disposed closer to the first liquid inlet than other heat dissipation fins of the plurality of heat dissipation fins to the first liquid inlet;
• wherein at least one of the heat dissipation fins includes no perforation.

A liquid-cooled heat sink head, including a heat exchange portion for contacting a heat source, the liquid-cooled heat sink head comprising:

• a metal substrate, the heat exchange portion being disposed thereon;
• a first cover covering the metal substrate to form a heat exchange chamber, the first cover including a first liquid inlet and a liquid outlet to allow a working fluid to flow in the heat exchange chamber;
• and
• a plurality of heat dissipation fins disposed on the metal substrate and in the heat exchange chamber, the heat dissipation fins being disposed between the first liquid inlet and the liquid outlet and arranged sequentially from the first liquid inlet toward the liquid outlet, a liquid passage being disposed between each two adjacent ones of the heat dissipation fins, wherein at least a portion of the heat dissipation fins is connected to the heat exchange portion, at least one of the heat dissipation fins has a perforation spaced a distance from a top edge of the at least one of the heat dissipation fins opposite to a bottom edge thereof which is connected to the heat exchange portion, the liquid passages at two opposite sides of the at least one of the heat dissipation fins communicate with each other through the perforation, and the at least one of the heat dissipation fins having the perforation is disposed closer to the first liquid inlet than other heat dissipation fins of the plurality of heat dissipation fins to the first liquid inlet;
• wherein the first cover includes only one stop plate being parallel to the plurality of heat dissipation fins, the stop plate is disposed between the plurality of heat dissipation fins and the liquid outlet, and the stop plate extends from an inner top surface of the first cover toward the heat exchange chamber.