BATTERY CELL, BATTERY, ELECTRIC DEVICE, AND METHOD AND DEVICE FOR MANUFACTURING BATTERY CELL
A battery cell, a battery, an electric device, and a method and device for manufacturing battery cell are provided. The battery cell includes an electrode assembly; and a housing configured to accommodate the electrode assembly, where a first wall of the housing includes a first body and a mounting body connected to the first body, the mounting body is provided with a pressure relief mechanism, and the pressure relief mechanism is configured to be actuated when internal pressure or temperature of the battery cell reaches a threshold, so as to relieve the pressure; in a thickness direction of the first wall, at least part of the mounting body protrudes out of a surface of the first body facing the electrode assembly in a direction approaching the electrode assembly.
1 . A battery cell, comprising:
an electrode assembly; and
a housing configured to accommodate the electrode assembly, wherein a first wall of the housing comprises a first body and a mounting body connected to the first body, the mounting body is provided with a pressure relief mechanism, and the pressure relief mechanism is configured to be actuated when internal pressure or temperature of the battery cell reaches a threshold, so as to relieve the pressure; and
in a thickness direction of the first wall, at least part of the mounting body protrudes out of a surface of the first body facing the electrode assembly in a direction approaching the electrode assembly; and, wherein a minimum distance between the pressure relief mechanism and the electrode assembly is less than a minimum distance between the first body and the electrode assembly.
2 . The battery cell according to claim 1 , wherein a thickness of at least part of the mounting body is greater than that of the first body.
3 . The battery cell according to claim 2 , wherein the mounting body comprises a mounting portion and a connecting portion, wherein the mounting portion is configured for mounting the pressure relief mechanism, and thickness of the mounting portion is greater than that of the connecting portion; and the connecting portion is configured to connect the mounting portion and the first body.
4 . The battery cell according to claim 1 , wherein the mounting body is provided with a pressure relief hole, and the pressure relief mechanism covers the pressure relief hole and is configured to be actuated when internal pressure or temperature of the battery cell reaches the threshold, so as to relieve the pressure via the pressure relief hole.
5 . The battery cell according to claim 4 , wherein the mounting body is provided with a first depression, wherein the first depression is recessed from a surface of the mounting body facing the electrode assembly in a direction leaving the electrode assembly, and at least part of the pressure relief mechanism is accommodated in the first depression.
6 . The battery cell according to claim 5 , wherein a bottom face of the first depression is closer to the electrode assembly than the surface of the first body facing the electrode assembly.
7 . The battery cell according to claim 5 , wherein the bottom face of the first depression is provided with the pressure relief hole.
8 . The battery cell according to claim 5 , further comprising:
a protective piece disposed on a side of the pressure relief hole facing away from the electrode assembly and configured to protect the pressure relief mechanism.
9 . The battery cell according to claim 8 , wherein a side of the mounting body facing away from the electrode assembly is provided with a protrusion surrounding the pressure relief hole, wherein the protrusion protrudes out of a surface of the mounting body facing away from the electrode assembly in a direction leaving the electrode assembly, and the protective piece is disposed on a surface of the protrusion facing away from the electrode assembly.
10 . The battery cell according to claim 9 , wherein the mounting body is provided with a second depression, wherein the second depression is recessed from the surface of the mounting body facing away from the electrode assembly in a direction approaching the electrode assembly, the pressure relief hole runs through a bottom face of the first depression and a bottom face of the second depression, and the protrusion is located on the bottom face of the second depression.
11 . The battery cell according to claim 10 , wherein a height of the protrusion is less than depth of the second depression.
12 . The battery cell according to claim 1 , wherein the mounting body and the first body are an integrally formed structure.
13 . The battery cell according to claim 12 , wherein the mounting body comprises a mounting portion and a connecting portion, wherein the mounting portion is configured for mounting the pressure relief mechanism, the connecting portion is configured to connect the mounting portion and the first body, and thickness of the connecting portion increases gradually from the first body to the mounting portion.
14 . The battery cell according to claim 1 , wherein the first wall further comprises a second body, wherein the second body is connected to the first body, the first body protrudes relative to the second body in a direction leaving the electrode assembly, and a recessed area is formed on the same side facing the electrode assembly, wherein the recessed area is configured for accommodating the pressure relief mechanism and at least part of the mounting body.
15 . The battery cell according to claim 14 , characterized in that the electrode assembly comprises a body portion and a tab; and
the first wall is provided with an electrode terminal, wherein the electrode terminal is configured to be electrically connected with the tab, and the recessed area is further configured for accommodating at least part of the tab.
16 . The battery cell according to claim 15 , characterized in that in the thickness direction, a minimum distance between the surface of the mounting body facing the electrode assembly and the body portion is a first distance, and a minimum distance between a surface of the second body facing the electrode assembly and the body portion is a second distance, wherein the second distance is less than or equal to the first distance.
17 . The battery cell according to claim 1 , wherein
the housing comprises:
a housing body provided with an opening, wherein the electrode assembly is accommodated in the housing body; and
a cover plate configured to cover the opening, wherein the first wall is the cover plate.
18 . A battery, characterized by comprising:
the battery cell according to claim 1 and
a box, wherein the box is configured to accommodate a number of such battery cells.
19 . An electric device, characterized by comprising the battery according to claim 18 , wherein the battery is configured to provide electric energy for the electric device.
20 . A method for manufacturing battery cell, characterized by comprising:
providing an electrode assembly; and
providing a cover plate and a housing body, wherein the electrode assembly is accommodated in the housing body, the cover plate comprises a first body and a mounting body connected to the first body, the mounting body is provided with a pressure relief mechanism, and the pressure relief mechanism is configured to be actuated when internal pressure or temperature of the battery cell reaches a threshold, so as to relieve the pressure; and
in a thickness direction of the cover plate, at least part of the mounting body protrudes out of a surface of the first body facing the electrode assembly in a direction approaching the electrode assembly; and a minimum distance between the pressure relief mechanism and the electrode assembly is less than a minimum distance between the first body and the electrode assembly.
21 . A device for manufacturing battery cell, characterized by comprising:
a first provision module configured to provide an electrode assembly; and
a second provision module configured to provide a cover plate and a housing body, wherein the electrode assembly is accommodated in the housing body, the cover plate comprises a first body and a mounting body connected to the first body, the mounting body is provided with a pressure relief mechanism, and the pressure relief mechanism is configured to be actuated when internal pressure or temperature of the battery cell reaches a threshold, so as to relieve the pressure; and
in a thickness direction of the cover plate, at least part of the mounting body protrudes out of a surface of the first body facing the electrode assembly in a direction approaching the electrode assembly; and a minimum distance between the pressure relief mechanism and the electrode assembly is less than a minimum distance between the first body and the electrode assembly.