Cap assembly of power battery
A cap assembly of a power battery comprises: a cap plate, a first electrode terminal provided to the cap plate, a second electrode terminal provided to the cap plate and electrically insulated from the cap plate, and a resistance member electrically connected to the cap plate and the first electrode terminal. The resistance member comprises: a heat-resistant insulating base body positioned between the cap plate and the first electrode terminal; and a heat-resistant metal layer provided to the heat-resistant insulating base body. The heat-resistant metal layer and the cap plate and the first electrode terminal are electrically connected to form a conductive path, the conductive path passes along the heat-resistant insulating base body positioned between the cap plate and the first electrode terminal. The formed conductive path is a curved path, therefore the resistance value of the resistance member can be controlled by controlling the conductive path.
1. A cap assembly of a power battery, comprising:
a cap plate;
a first electrode terminal provided to the cap plate;
a second electrode terminal provided to the cap plate and electrically insulated from the cap plate; and
a resistance member electrically connected to the cap plate and the first electrode terminal;
the resistance member comprising:
a heat-resistant insulating base body positioned between the cap plate and the first electrode terminal; and
a heat-resistant metal layer provided to the heat-resistant insulating base body;
wherein
the resistance member further comprises: a base body conductor provided to the heat-resistant insulating base body;
the number of the heat-resistant insulating base bodies is at least one;
each heat-resistant insulating base body is provided with a receiving hole, and an upper side and a lower side of each heat-resistant insulating base body along an axial direction each are provided with one heat-resistant metal layer;
the number of the base body conductors is greater than or equal to the number of the heat-resistant insulating base bodies, each base body conductor is inserted into the receiving hole of the corresponding heat-resistant insulating base body and is electrically connected to the two heat-resistant metal layers respectively provided on the upper side and the lower side of the corresponding heat-resistant insulating base body along the axial direction;
when the number of the heat-resistant insulating base bodies is more than one, all the heat-resistant insulating base bodies are provided along a vertical direction, and two adjacent heat-resistant insulating base bodies along the vertical direction share one heat-resistant metal layer provided between the two adjacent heat-resistant insulating base bodies;
wherein the resistance member further comprises: a metal coating provided along the vertical direction and electrically connected to an outer side of the heat-resistant metal layer positioned at an outermost side of the resistance member along the vertical direction;
all the base body conductors, all the heat-resistant metal layers, all the metal coatings, the cap plate and the first electrode terminal are electrically connected to form a conductive path, the conductive path passes along all the heat-resistant insulating base bodies positioned between the cap plate and the first electrode terminal;
wherein the metal coating is provided with a recessed groove, the recessed groove receives the heat-resistant metal layer positioned at the outermost side of the resistance member along the vertical direction.
2. The cap assembly of the power battery according to claim 1 , wherein the cap assembly of the power battery further comprises:
a circlip positioned above the heat-resistant insulating base body of the resistance member, clipped to and electrically connected to the first electrode terminal, and electrically connected to the heat-resistant metal layer of the resistance member.
3. The cap assembly of the power battery according to claim 1 , wherein the cap assembly of the power battery further comprises:
a connecting block positioned above the heat-resistant insulating base body of the resistance member, fixed to and electrically connected to the first electrode terminal, and electrically connected to the heat-resistant metal layer of the resistance member.
4. A cap assembly of a power battery, comprising:
a cap plate;
a first electrode terminal provided to the cap plate;
a second electrode terminal provided to the cap plate and electrically insulated from the cap plate; and
a resistance member electrically connected to the cap plate and the first electrode terminal;
the resistance member comprising:
a heat-resistant insulating base body positioned between the cap plate and the first electrode terminal; and
a heat-resistant metal layer provided to the heat-resistant insulating base body;
wherein
the resistance member further comprises: a base body conductor provided to the heat-resistant insulating base body;
the number of the heat-resistant insulating base bodies is at least one;
each heat-resistant insulating base body is provided with a receiving hole, and an upper side and a lower side of each heat-resistant insulating base body along an axial direction each are provided with one heat-resistant metal layer;
the number of the base body conductors is greater than or equal to the number of the heat-resistant insulating base bodies, each base body conductor is inserted into the receiving hole of the corresponding heat-resistant insulating base body and is electrically connected to the two heat-resistant metal layers respectively provided on the upper side and the lower side of the corresponding heat-resistant insulating base body along the axial direction;
when the number of the heat-resistant insulating base bodies is more than one, all the heat-resistant insulating base bodies are provided along a vertical direction, and two adjacent heat-resistant insulating base bodies along the vertical direction share one heat-resistant metal layer provided between the two adjacent heat-resistant insulating base bodies;
wherein the resistance member further comprises: a metal coating provided along the vertical direction and electrically connected to an outer side of the heat-resistant metal layer positioned at an outermost side of the resistance member along the vertical direction;
wherein the resistance member further comprises:
an insulative piece correspondingly provided along the vertical direction, provided between the heat-resistant metal layer positioned at the outermost side of the resistance member along the vertical direction and the corresponding metal coating, and provided with an accommodating hole; and
an insulative piece conductor inserted into the accommodating hole of the insulative piece and electrically connected to the heat-resistant metal layer positioned at the outermost side of the resistance member along the vertical direction and the corresponding metal coating;
all the base body conductors, all the heat-resistant metal layers, all the metal coatings, all the insulative piece conductors, the cap plate and the first electrode terminal are electrically connected to form a conductive path, the conductive path passes along all the heat-resistant insulating base bodies positioned between the cap plate and the first electrode terminal.
5. The cap assembly of the power battery according to claim 4 , wherein the insulative piece is provided with a recessed portion receiving the corresponding heat-resistant metal layer.
6. The cap assembly of the power battery according to claim 1 , wherein the heat-resistant metal layer is comprised of a plurality of curved metal wires.
7. The cap assembly of the power battery according to claim 4 , wherein the heat-resistant metal layer is comprised of a plurality of curved metal wires.
8. The cap assembly of the power battery according to claim 1 , wherein the cap assembly of the power battery further comprises:
a reverse plate provided to the cap plate and electrically connected to the cap plate; and
a short-circuit protection conductive plate positioned above the reverse plate and electrically connected to the second electrode terminal.