End cap assembly, battery cell, battery, and electrical device
View Patent ↗Embodiments of this application provide an end cap assembly, a battery cell, a battery, and an electrical device. The end cap assembly may be applicable to the battery cell. The end cap assembly may include: an end cap; and an end cap patch attached to the end cap. At least one through-hole may be made on the end cap patch. The through-hole may be configured to be filled with a heat transfer structure. The end cap may exchange heat with the outside through the heat transfer structure so as to regulate a temperature inside the battery cell.
1 . An end cap assembly, applicable to a battery cell, wherein the end cap assembly comprises:
an end cap comprising a pair of electrode terminals; and
an end cap patch attached to the end cap, wherein
the end cap patch comprises at least one through-hole, the at least one through-hole is filled with a heat transfer structure, and the end cap exchanges heat with an outside through the heat transfer structure so as to regulate a temperature inside the battery cell,
the end cap comprises a first body having portions on both sides of a first protruding portion along a length direction of the end cap patch,
the first protruding portion protrudes away from an interior of the battery cell, and
the first protruding portion extends continuously around and between the pair of electrode terminals along the length direction of the end cap patch.
2 . The end cap assembly according to claim 1 , wherein the heat transfer structure is a heat transfer gel.
3 . The end cap assembly according to claim 1 , wherein:
a first recessed portion recessed away from the interior of the battery cell is formed at a position that corresponds to the first protruding portion and that is located on the first body, and the first recessed portion accommodates at least a part of an electrode assembly of the battery cell, and
the pair of electrode terminals are mounted on the first protruding portion.
4 . The end cap assembly according to claim 3 , wherein the at least one through-hole is made in a part of the end cap patch at which the end cap patch is attached to the first body.
5 . The end cap assembly according to claim 4 , wherein the end cap patch comprises a first part and a second part that are attached to the first body;
the at least one through-hole comprises a plurality of through-holes;
along the length direction of the end cap patch, two first parts are located on both sides of the first protruding portion respectively;
along a width direction of the end cap patch, the second part is located on both sides of the first protruding portion; and
the second part is located between the two first parts, and the plurality of through-holes are made in the first parts.
6 . The end cap assembly according to claim 5 , wherein a total area of cross sections of the plurality of through-holes in a plane parallel to the first part on the first part is 10% to 50% of an area of the first part.
7 . The end cap assembly according to claim 1 , wherein a diameter of the at least one through-hole is less than 10 mm.
8 . The end cap assembly according to claim 1 , wherein a temperature sensor is disposed in the at least one through-hole to acquire the temperature inside the battery cell.
9 . The end cap assembly according to claim 1 , further comprising an insulation structure disposed on a side that is of the end cap and oriented toward the interior of the battery cell, and the insulation structure isolates the end cap from an electrode assembly of the battery cell.
10 . The end assembly according to claim 9 , wherein the insulation structure is made of rubber or plastic.
11 . The end assembly according to claim 9 , wherein the insulation structure includes a second body and a second protruding portion, the second protruding portion protrudes away from the interior of the battery cell, a second recessed portion recessed away from the interior of the battery cell is formed at a position that corresponds to the second protruding portion and that is located on the second body, and the second recessed portion accommodates at least a part of the electrode assembly.
12 . The end assembly according to claim 1 , wherein the end cap is made of a metal material.
13 . The end cap assembly according to claim 1 , wherein
the first protruding portion located between the pair of electrode terminals extends in a protruding portion plane farther away from the interior of the battery than a first body portion plane that extends along the first body and is parallel with the protruding portion plane,
the first body is connected to the first protruding portion by an angled portion, and
the angled portion is angled with respect to both the protruding portion plane and the first body portion plane.
14 . The end cap assembly according to claim 13 , wherein
the end cap further comprises a pressure relief mechanism located between the pair of electrode terminals, the pressure relief mechanism releases pressure inside the battery cell in response to an internal pressure or the temperature inside the battery cell exceeding a predetermined threshold.
15 . The end cap assembly according to claim 14 , wherein
the pressure relief mechanism corresponds to at least one of an explosion-proof valve, a rupture disk, a gas valve, or a pressure relief valve.
16 . A battery cell, comprising:
a housing, wherein an opening is made at an end of the housing;
an electrode assembly accommodated in the housing; and
an end cap assembly, applicable to the battery cell, wherein the end cap assembly comprises:
an end cap comprising a pair of electrode terminals; and
an end cap patch attached to the end cap, wherein
the end cap patch comprises at least one through-hole, the at least one through-hole is filled with a heat transfer structure, and the end cap exchanges heat with an outside through the heat transfer structure so as to regulate a temperature inside the battery cell,
the end cap comprises a first body having portions on both sides of a first protruding portion along a length direction of the end cap patch,
the first protruding portion protrudes away from an interior of the battery cell, and
the first protruding portion extends continuously around and between the pair of electrode terminals along the length direction of the end cap patch, wherein the end cap fits and covers the opening.
17 . A battery, comprising:
the battery cell according to claim 16 ; and
a thermal management structure, wherein the end cap exchanges heat with the thermal management structure through the heat transfer structure so as to regulate the temperature inside the battery cell.
18 . The battery according to claim 17 , wherein the thermal management structure is attached to a first part of the end cap patch, and the thermal management structure regulates the temperature inside the battery cell.
19 . The battery according to claim 17 , wherein the heat transfer structure comprises a first connecting portion, and the first connecting portion is disposed between the end cap and the end cap patch.
20 . The battery according to claim 17 , wherein the heat transfer structure comprises a second connecting portion, and the second connecting portion is disposed between the end cap patch and the thermal management structure.
21 . The battery according to claim 17 , wherein an electrode terminal among the pair of electrode terminals is disposed on the end cap, and the electrode terminal among the pair of electrode terminals comprises an end face oriented away from the interior of the battery cell;
the thermal management structure comprises an outer surface oriented away from the interior of the battery cell; and
along a thickness direction of the end cap patch, the outer surface is closer to the interior of the battery cell than the end face.
22 . An electrical device, comprising the battery according to claim 17 , wherein the battery is configured to provide electrical energy.
23 . The electrical device according to claim 22 , wherein the electric device is a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, or a power tool.