BATTERY CELL, METHOD AND SYSTEM FOR MANUFACTURING A BATTERY CELL, BATTERY AND ELECTRICAL DEVICE
The embodiments of the present application provide a battery cell, a method and system for manufacturing a battery cell, a battery and an electrical device. The battery cell includes: an electrode assembly, including a first tab and a second tab with opposite polarities; a casing for accommodating the electrode assembly, wherein the casing includes a cylinder body and a cover body connected to the cylinder body, the cylinder body is disposed around an outer periphery of the electrode assembly, the cover body is provided with an electrode lead-out hole, and at least part of the cover body is used for electrically connecting a first connecting member of the battery and the first tab; and an electrode terminal for electrically connecting a second connecting member of the battery and the second tab.
1 . A battery cell for use in a battery, comprising:
an electrode assembly, comprising a first tab and a second tab with opposite polarities;
a casing for accommodating the electrode assembly, wherein the casing comprises a cylinder body and a cover body connected to the cylinder body, the cylinder body is disposed around an outer periphery of the electrode assembly, the cover body is provided with an electrode lead-out hole, and at least part of the cover body is used for electrically connecting a first connecting member of the battery and the first tab; and
an electrode terminal for electrically connecting a second connecting member of the battery and the second tab, wherein the electrode terminal is disposed at the cover body in an insulating manner and installed at the electrode lead-out hole, one of the cover body and the electrode terminal is a positive output pole of the battery cell, and the other is a negative output pole of the battery cell.
2 . The battery cell according to claim 1 , wherein the cover body and the cylinder body are formed as an integral structure.
3 . The battery cell according to claim 1 , wherein the cover body comprises a connecting portion and a bending portion, the electrode lead-out hole is provided on the connecting portion, at least a portion of the connecting portion is used for connecting the first connecting member and the first tab, and the bending portion is used for connecting the cylinder body and the connecting portion.
4 . The battery cell according to claim 3 , wherein the connecting portion comprises a main body portion and a first concave portion, the main body portion is disposed around an outer periphery of the first concave portion, the main body portion is used for connecting the first connecting member and the first tab, the first concave portion is recessed from an outer surface of the main body portion in a direction facing the electrode assembly, the electrode lead-out hole penetrates a bottom wall of the first concave portion, and communicates the first concave portion with an inner portion of the casing;
the battery cell further comprises a first insulating member, the first concave portion is configured to accommodate at least a portion of the first insulating member, and a portion of the first insulating member that is accommodated within the first concave portion is attached to a side wall and/or the bottom wall of the first concave portion.
5 . The battery cell according to claim 4 , wherein a thickness of the main body portion is greater than a wall thickness of the cylinder body.
6 . The battery cell according to claim 5 , wherein a difference between the thickness D1 of the main body portion and the wall thickness D2 of the cylinder body satisfies: 0.1 mm≤D1−D2≤2 mm.
7 . The battery cell according to claim 4 , wherein the cylinder body is cylindrical, the electrode lead-out hole is a circular hole, a central axis of the cylinder body and a central axis of the electrode lead-out hole are arranged to overlap.
8 . The battery cell according to claim 7 , wherein an inner radius L1 of the cylinder body and a width L2 of the main body portion satisfy: 0.2≤L2/L1≤0.8, and the width L2 of the main body portion is a difference between an outer radius of the main body portion and an inner radius of the main body portion.
9 . The battery cell according to claim 4 , wherein the main body portion is used for welding with the first connecting member and forming a first welding area on the main body portion, the first welding area is disposed to be spaced apart from a first end portion of the bending portion, and the first end portion is used for connecting the main body portion.
10 . The battery cell according to claim 9 , wherein a welding depth D3 of the first welding area and the thickness D1 of the main body portion satisfy: 0.1≤D3/D1≤0.8.
11 . The battery cell according to claim 4 , wherein the battery cell further comprises a second insulating member, the second insulating member comprises an insulating body and an insulating protrusion protruding from an outer periphery of the insulating body, the insulating body abuts on a side of the main body portion facing the electrode assembly, the insulating protrusion is arranged on a side of the bending portion facing the electrode assembly, a surface of the insulating protrusion away from the electrode assembly is closer to the electrode assembly than a surface of the insulating body away from the electrode assembly, so as to form a second concave portion for avoiding the bending portion.
12 . The battery cell according to claim 11 , wherein the insulating protrusion protrudes beyond a second end portion of the bending portion in a direction facing the electrode assembly, and the second end portion is used for connecting the cylinder body.
13 . The battery cell according to claim 11 , wherein an inner surface of the insulating body is formed with a third concave portion recessed in a direction away from the electrode assembly, and at least part of the electrode terminal is accommodated within the third concave portion.
14 . The battery cell according to claim 11 , wherein a thickness of the insulating body is greater than a thickness of the main body portion.
15 . The battery cell according to claim 4 , wherein a convex portion is formed at a position on the connecting portion opposite to the first concave portion, and the convex portion protrudes from an inner surface of the main body portion in a direction facing the electrode assembly;
the connecting portion further comprises a fourth concave portion, the fourth concave portion is recessed from a top end surface of the convex portion to the inner surface of the main body portion in a direction away from the electrode assembly;
the battery cell further comprises a second insulating member, the fourth concave portion is configured to accommodate at least part of the second insulating member, and the part of the second insulating member that is accommodated within the fourth concave portion is attached to a side wall and/or a bottom wall of the fourth concave portion.
16 . The battery cell according to claim 3 , wherein the bending portion comprises a first end portion for connecting the connecting portion and a second end portion for connecting the cylinder body, and in a direction from the first end portion to the second end portion, a thickness of the bending portion gradually decreases.
17 . The battery cell according to claim 1 , wherein the second tab is provided at one end of the electrode assembly facing the cover body, and the first tab is provided at the other end of the electrode assembly away from the cover body;
the cylinder body is used for connecting the first tab and the cover body, to enable the first tab to be electrically connected to the cover body.
18 . The battery cell according to claim 1 , wherein the first tab is a negative pole tab, and a base material of the casing is steel.
19 . The battery cell according to claim 1 , wherein the cylinder body has an opening at one end away from the cover body, and the battery cell further comprises a cover plate for closing the opening.
20 . A battery comprising:
the battery cell according to claim 1 ;
the first connecting member connected to the cover body; and
the second connecting member connected to the electrode terminal.