SCREW, CONNECTION STRUCTURE, BATTERY, AND ELECTRIC APPARATUS
A screw includes a head and a threaded rod connected to the head. An annular protrusion is provided on a surface of the head located on a threaded rod side. When two connecting members are connected by the screw, the annular protrusion of the screw abuts against one of the two connecting members to form a tightly abutting structure to achieve sealing.
1 . A screw, comprising:
a head; and
a threaded rod connected to the head;
wherein an annular protrusion is provided on a surface of the head located on a threaded rod side.
2 . The screw according to claim 1 , wherein:
on a cross section at which a central axis of the annular protrusion is located, the annular protrusion has any one of a triangular cross section and an arc-shaped cross section.
3 . The screw according to claim 1 , wherein:
the head has a plum-shaped top and a cap edge extending radially more outward than the top, the annular protrusion being disposed on the cap edge.
4 . The screw according to claim 1 , wherein:
on the surface of the head located on the threaded rod side, the annular protrusion has an annular sealant application portion radially outward.
5 . The screw according to claim 4 , wherein the sealant application portion is coated with a sealant.
6 . The screw according to claim 1 , wherein:
the screw is a flow drill screw, and
an annular groove is provided radially inward of the annular protrusion.
7 . The screw according to claim 6 , wherein a sealant is applied in the annular groove.
8 . The screw according to claim 1 , wherein the annular protrusion surrounds the threaded rod, and the annular protrusion and the threaded rod are spaced apart.
9 . A connection structure, comprising:
a first connecting member;
a second connecting member; and
the screw according to claim 1 , connecting the first connecting member and the second connecting member.
10 . The connection structure according to claim 9 , wherein:
in a connected state, the annular protrusion of the screw abuts against one of the first connecting member and the second connecting member; and
on a surface at which one of the first connecting member and the second connecting member abuts against the annular protrusion, an annular indentation engaged with the annular protrusion is formed.
11 . The connection structure according to claim 10 , wherein:
in the connected state, radially outward of the annular protrusion, a sealant is present between the head and a surface of a head-contacting one of the first connecting member and the second connecting member.
12 . The connection structure according to claim 10 , wherein:
a sealant is provided in an annular groove radially inward of the annular protrusion.
13 . A battery, comprising the screw according to claim 1 .
14 . An electric apparatus, comprising the battery according to claim 13 .