Electrical connector and electrical connector assembly

1. An electrical connector assembly, comprising:

a first connector having a first engagement portion on a first mating end, at least one first ridge positioned on and protruding outward from an outer surface of the first engagement portion, and at least one first heat dissipation ventilation hole positioned on the first engagement portion; and

a second connector having a second engagement portion on a second mating end, the second engagement portion having

a first connector receiving chamber having an inner surface, and

at least one second ridge positioned on and protruding inward from the inner surface, being in electrical contact with the first ridge when the first engagement portion is positioned in the first connector receiving chamber.

2. The electrical connector assembly according to claim 1 , wherein the at least one first ridge extends in a direction that is angled to a direction in which at least a part of the at least one second ridge extends.

3. The electrical connector assembly according to claim 1 , wherein the at least one first ridge and the at least one second ridge each have a semicircular cross section.

4. The electrical connector assembly according to claim 3 , wherein either the at least one first ridge or the at least one second ridge extends in a straight line, and the other of the at least one first ridge and the at least one second ridges extends in a curved line or a zigzag line.

5. The electrical connector assembly according to claim 3 , wherein one first ridge electrically contacts a respective second ridge at a plurality of points.

6. The electrical connector assembly according to claim 5 , wherein a pair of first ridges is symmetrically positioned on the outer surface of the first engagement portion.

7. The electrical connector assembly according to claim 6 , wherein a pair of second ridges is symmetrically positioned on the inner surface of the first connector receiving chamber.

8. The electrical connector assembly according to claim 1 , wherein at least one second heat dissipation ventilation hole is formed in the second engagement portion.

9. The electrical connector assembly according to claim 8 , wherein when the first engagement portion is engaged with the second engagement portion, at least one of the first heat dissipation ventilation holes is positioned proximate to at least one of the second heat dissipation ventilation holes, such that there is fluid communication between the first and second heat dissipation ventilation holes.

10. The electrical connector assembly according to claim 9 , wherein at least one elastic arm is formed on the second engagement portion.

11. The electrical connector assembly according to claim 10 , wherein when the first engagement portion is engaged with the second engagement portion, the elastic arm abuts against and electrically contacts an outer surface of a side of the first engagement portion opposite to the first ridges.

12. The electrical connector assembly according to claim 1 , wherein the first connector has a first crimping portion positioned on a first terminating end opposite the first mating end.

13. The electrical connector assembly according to claim 12 , wherein the second connector has a second crimping portion positioned on a second terminating end opposite the second mating end.

14. The electrical connector assembly according to claim 12 , wherein at least one groove is positioned on at least one of the first and second crimping portions to enhance a frictional force between each crimping portion and a respectively connected wire.

15. An electrical connector, comprising:

a metal engagement portion complementary to a mating electrical connector having at least one ridge, the engagement portion having

an engaging surface, and

at least one ridge positioned on and protruding from the engaging surface at the same height along the length of the engaging surface, the at least one ridge extending in a curved line or a zigzag line along the length of the engaging surface such that the at least one ridge electrically contacts the at least one ridge of the mating electrical connector at a plurality of points when the electrical connector is matched with the mating electrical connector.