Cylindrical battery cell, battery, electricity consuming device, manufacturing method and manufacturing system
A cylindrical battery cell, a battery, an electricity consuming device, a manufacturing method and a manufacturing system are provided. The cylindrical battery cell includes a shell, including an opening; and an electrode assembly, disposed in the shell, the electrode assembly including a separator and a tab, and along an axial direction of the electrode assembly, the tab being located at one end of the electrode assembly and extending toward the opening, the tab including a first portion and a second portion, the second portion surrounding a periphery of the first portion, and the separator wrapping the second portion to isolate the second portion from the shell, wherein along the axial direction, the first portion extends beyond the second portion and the separator, and the second portion does not extend beyond the separator. The battery cell of the present application solves a problem of short circuit in the battery cell.
1. A cylindrical battery cell, comprising:
a shell, comprising an opening;
an electrode assembly, disposed in the shell, the electrode assembly comprising a separator and a tab, along an axial direction of the electrode assembly, the tab being located at one end of the electrode assembly and extending toward the opening, the tab comprising a first portion and a second portion, the second portion surrounding a periphery of the first portion, and the separator wrapping the second portion to isolate the second portion from the shell;
a cap;
a first insulating member; and
a second insulating member,
wherein along the axial direction, the first portion extends beyond the second portion and the separator, and the second portion does not extend beyond the separator,
the cap is configured to cover the opening and connected to the shell, the first insulating member is disposed on a side of the cap close to the electrode assembly, the first insulating member comprises a recess, and at least part of the first portion is accommodated in the recess,
the second insulating member surrounds the first insulating member and the second portion, and covers an edge of the first insulating member and an edge of the second portion.
2. The cylindrical battery cell according to claim 1 , wherein a dimension of the first portion extending beyond the separator is H, and a difference between an outer diameter and an inner diameter of the second portion is L, wherein L is greater than H.
3. The cylindrical battery cell according to claim 2 , wherein the dimension H of the first portion extending beyond the separator ranges from 1 mm to 8 mm.
4. The cylindrical battery cell according to claim 1 , wherein the first insulating member is in contact with a part of the separator extending beyond the second portion.
5. The cylindrical battery cell according to claim 1 , wherein the first insulating member comprises a body portion and an extension portion connected with each other, the body portion is configured to connect with the cap, the extension portion extends and protrudes from the body portion and toward the electrode assembly to form the recess, the extension portion surrounds the periphery of the first portion, and the extension portion is in contact with a part of the separator extending beyond the second portion.
6. The cylindrical battery cell according to claim 5 , wherein the extension portion is formed as a closed annular structure extending continuously, or is formed as an annular structure with a notch.
7. The cylindrical battery cell according to claim 1 , wherein the second insulating member presses against an outer side surface of the first insulating member facing the shell.
8. The cylindrical battery cell according to claim 7 , wherein the outer side surface comprises a guide inclined surface, the guide inclined surface being inclined toward the recess in a direction away from the cap.
9. The cylindrical battery cell according to claim 1 , wherein the electrode assembly further comprises a first electrode plate and a second electrode plate, wherein the first electrode plate and the second electrode plate each comprises a coated area and an uncoated area, the uncoated area of the first electrode plate or the second electrode plate forms the tab, the separator is adapted to isolate the first electrode plate from the second electrode plate, and the first electrode plate, the second electrode plate and the separator are wound to form the electrode assembly.
10. A battery comprising the cylindrical battery cell according to claim 1 .
11. An electricity consuming device, comprising the cylindrical battery cell according to claim 1 , the cylindrical battery cell being adapted to provide electrical energy.
12. A manufacturing method of a cylindrical battery cell, the method comprising:
providing a shell comprising an opening;
providing an electrode assembly, the electrode assembly comprising a separator and a tab, the tab comprising a first portion and a second portion, the second portion surrounding a periphery of the first portion, the separator wrapping the second portion to isolate the second portion from the shell, wherein along an axial direction of the electrode assembly, the first portion extends beyond the second portion and the separator, and the second portion does not extend beyond the separator;
loading the electrode assembly into the shell, wherein along the axial direction of the electrode assembly, the tab is located at one end of the electrode assembly and extends toward the opening;
providing a cap and a first insulating member, wherein the cap is configured to cover the opening and connected to the shell, the first insulating member is disposed on a side of the cap close to the electrode assembly, the first insulating member comprises a recess, and at least part of the first portion is accommodated in the recess; and
providing a second insulating member to surround the first insulating member and the second portion and to cover an edge of the first insulating member and an edge of the second portion.
13. The manufacturing method of the cylindrical battery cell according to claim 12 , wherein the manufacturing method further comprises: cutting away a part of the tab of the electrode assembly to form the second portion.
14. A manufacturing system for a cylindrical battery cell, comprising:
a first assembling device, configured to provide an electrode assembly, the electrode assembly comprising a separator and a tab, the tab comprising a first portion and a second portion, the second portion surrounding a periphery of the first portion, wherein along an axial direction of the electrode assembly, the first portion extends beyond the second portion and the separator, and the second portion does not extend beyond the separator;
a second assembling device, configured to provide a shell and a cap, wherein the shell comprises an opening, the cap is configured to cover the opening and connected to the shell, the cap comprises a first insulating member is disposed on a side of the cap close to the electrode assembly, the first insulating member comprises a recess, and at least part of the first portion is accommodated in the recess; and
a third assembling device, configured to:
load the electrode assembly into the shell, wherein along the axial direction of the electrode assembly, the tab is located at one end of the electrode assembly and extends toward the opening, and the separator wraps the second portion to isolate the second portion from the shell,
provide a second insulating member to surround the first insulating member and the second portion and to cover an edge of the first insulating member and an edge of the second portion, and
cover the opening with the cap.