End cap assembly, battery cell, battery, and electrical device
An end cap assembly, a battery cell, a battery, an electrical device, and a method and device for manufacturing a battery cell are provided. The end cap assembly includes an end cap and a pressure relief mechanism. The pressure relief mechanism is connected to the end cap. The pressure relief mechanism is configured to: keep in a first pressure relief state when an internal pressure or temperature of the battery cell is greater than or equal to a first threshold and less than a second threshold, so as to release the internal pressure of the battery cell; and keep in a second pressure relief state when the internal pressure or temperature of the battery cell is greater than or equal to the second threshold, so as to release the internal pressure of the battery cell.
1 . An end cap assembly, applicable to a battery cell, and comprising:
an end cap; and
a pressure relief mechanism, connected to the end cap, wherein the pressure relief mechanism is configured to: keep in a first pressure relief state when an internal pressure or temperature of the battery cell is greater than or equal to a first threshold and less than a second threshold, so as to release the internal pressure of the battery cell; and keep in a second pressure relief state when the internal pressure or temperature of the battery cell is greater than or equal to the second threshold, so as to release the internal pressure of the battery cell, wherein
the pressure relief mechanism comprises a main body and an opening apparatus,
the main body comprises a pressure relief port and an abutting portion, the opening apparatus comprises a blocking piece connected to the main body and an extruding piece movably disposed on the main body, the extruding piece is the extruding piece is closer to an interior of the battery cell than the abutting portion,
when the internal pressure or temperature of the battery cell is greater than or equal to the first threshold, the extruding piece is configured to move against the main body to compress the blocking piece and the abutting portion is configured to coordinate with the extruding piece to extrude the blocking piece, so as to open at least a part of the pressure relief port and to release the internal pressure of the battery cell through the pressure relief port,
a pressure relief area at the pressure relief port in the first pressure relief state is smaller than a pressure relief area at the pressure relief port in the second pressure relief state.
2 . The end cap assembly according to claim 1 , wherein the pressure relief port comprises a first pressure relief port and a second pressure relief port that are independent of each other, the first pressure relief port is opened and the second pressure relief port is closed when the pressure relief mechanism is in the first pressure relief state, and both the first pressure relief port and the second pressure relief port are opened when the pressure relief mechanism is in the second pressure relief state.
3 . The end cap assembly according to claim 1 , wherein the main body further comprises a position limiting portion, the position limiting portion is disposed around the abutting portion, the position limiting portion and the abutting portion jointly define an accommodation cavity, and the accommodation cavity is configured to accommodate the extruding piece and the blocking piece.
4 . The end cap assembly according to claim 3 , wherein a clearance exists between an inner wall of the position limiting portion and an outer wall of the extruding piece.
5 . The end cap assembly according to claim 3 , wherein the pressure relief port is disposed in the position limiting portion.
6 . The end cap assembly according to claim 1 , wherein the main body further comprises a position limiting structure, and the position limiting structure is configured to support the extruding piece so that the extruding piece is prevented from moving toward an interior of the battery cell.
7 . The end cap assembly according to claim 6 , wherein the position limiting structure is an annular structure.
8 . The end cap assembly according to claim 2 , wherein the first pressure relief port is closer to an interior of the battery cell than the second pressure relief port.
9 . The end cap assembly according to claim 1 , wherein the end cap comprises a recessed portion that is recessed toward an interior of the battery cell, and the recessed portion is configured to accommodate at least a part of the pressure relief mechanism.
10 . A battery cell, comprising:
a shell, on which an opening is made;
an electrode assembly, accommodated in the shell; and
the end cap assembly according to claim 1 , wherein the end cap is configured to fit and cover the opening.
11 . A battery, comprising:
a box; and
the battery cell according to claim 10 , wherein the battery cell is accommodated in the box.
12 . An electrical device, comprising the battery cell according to claim 10 .
13 . An end cap assembly, applicable to a battery cell, comprising:
an end cap; and
a pressure relief mechanism, connected to the end cap, wherein the pressure relief mechanism is configured to: keep in a first pressure relief state when an internal pressure or temperature of the battery cell is greater than or equal to a first threshold and less than a second threshold, so as to release the internal pressure of the battery cell; and keep in a second pressure relief state when the internal pressure or temperature of the battery cell is greater than or equal to the second threshold, so as to release the internal pressure of the battery cell, wherein
the pressure relief mechanism comprises a main body and an opening apparatus,
the main body comprises a pressure relief port and a position limiting structure, the opening apparatus comprises a blocking piece connected to the main body and an extruding piece movably disposed on the main body,
when the internal pressure or temperature of the battery cell is greater than or equal to the first threshold, the extruding piece is configured to move against the main body to compress the blocking piece, so as to open at least a part of the pressure relief port and to release the internal pressure of the battery cell through the pressure relief port, the position limiting structure is configured to support the extruding piece so that the extruding piece is prevented from moving toward an interior of the battery cell,
a pressure relief area at the pressure relief port in the first pressure relief state is smaller than a pressure relief area at the pressure relief port in the second pressure relief state.
14 . The end cap assembly according to claim 13 , wherein the position limiting structure is an annular structure.
15 . The end cap assembly according to claim 13 , wherein the pressure relief port comprises a first pressure relief port and a second pressure relief port that are independent of each other, the first pressure relief port is opened and the second pressure relief port is closed when the pressure relief mechanism is in the first pressure relief state, and both the first pressure relief port and the second pressure relief port are opened when the pressure relief mechanism is in the second pressure relief state.
16 . The end cap assembly according to claim 15 , wherein the first pressure relief port is closer to an interior of the battery cell than the second pressure relief port.
17 . The end cap assembly according to claim 13 , wherein the end cap comprises a recessed portion that is recessed toward an interior of the battery cell, and the recessed portion is configured to accommodate at least a part of the pressure relief mechanism.
18 . A battery cell, comprising:
a shell, on which an opening is made;
an electrode assembly, accommodated in the shell; and
the end cap assembly according to claim 17 , wherein the end cap is configured to fit and cover the opening.
19 . A battery, comprising:
a box; and
the battery cell according to claim 18 , wherein the battery cell is accommodated in the box.
20 . An electrical device, comprising the battery cell according to claim 18 .