Spirally wound electrode assembly, battery cell, battery and electric apparatus
View Patent ↗Disclosed are a wound electrode assembly, and a method and manufacturing apparatus for manufacturing the wound electrode assembly. The wound electrode assembly includes an electrode sheet. The electrode sheet includes a winding ending section, the winding ending section is provided with a plurality of first tabs, the plurality of first tabs are laminated, and among the two adjacent first tabs, a width of the first tab close to a winding center of the wound electrode assembly is greater than a width of the first tab away from the winding center. Among the two adjacent first tabs, a width of the first tab close to the winding center is greater than a width of the first tab away from the winding center. After the winding ending section is wound, the amount of misalignment between the two adjacent first tabs is reduced.
1 . A wound electrode assembly, comprising:
an electrode sheet, comprising a winding ending section, wherein the winding ending section is provided with a plurality of first tabs, the plurality of first tabs are laminated, and among any two adjacent first tabs, a width of a first tab of said two adjacent first tabs that is closest to a winding center of the wound electrode assembly is greater than a width of a first tab of said two adjacent first tabs that is away from the winding center; wherein
the electrode sheet further comprises a winding start section connected with the winding ending section, the winding start section is provided with at least one second tab, the at least one second tab and the plurality of the first tabs being laminated; and
a width of the at least one second tab is greater than or equal to the width of a first tab that is closest to the winding center among the plurality of first tabs.
2 . The wound electrode assembly according to claim 1 , wherein the at least one second tabs comprises a plurality of second tabs, the plurality of second tabs are laminated, and the widths of the plurality of second tabs are equal.
3 . The wound electrode assembly according to claim 2 , wherein the quantity of the second tabs is less than or equal to 25.
4 . The wound electrode assembly according to claim 1 , wherein the at least one second tab comprises a plurality of second tabs, and among any two adjacent second tabs, a width of the second tab of said two adjacent second tabs that is closest to the winding center is greater than a width of the second tab of said two adjacent second tabs that is away from the winding center.
5 . The wound electrode assembly according to claim 1 , wherein
the first tabs have connection ends and free ends, and the connection ends are connected to one end of the winding ending section in a width direction of the electrode sheet; and
in a direction from the connection ends to the free ends, the width of each first tab of the plurality of first tabs gradually decreases.
6 . The wound electrode assembly according to claim 1 , wherein a width difference between any two adjacent first tabs is equal.
7 . The wound electrode assembly according to claim 1 , wherein a width difference between any two adjacent first tabs gradually increases in a direction of the plurality of first tabs facing away from the winding center.
8 . The wound electrode assembly according to claim 1 , wherein a width difference between any two adjacent first tabs is 0.5 mm-4 mm in a direction of the plurality of first tabs facing away from the winding center.
9 . The wound electrode assembly according to claim 1 , wherein a height of the plurality of first tabs gradually decreases in a direction of the plurality of first tabs facing away from the winding center.
10 . The wound electrode assembly according to claim 9 , wherein a ratio of width to height of each first tab of the plurality of first tabs is the same.
11 . The wound electrode assembly according to claim 1 , wherein a distance between any two adjacent first tabs gradually increases in a winding direction of the wound electrode assembly.
12 . A battery cell, comprising:
a case; and
a wound electrode assembly according to claim 11 ,
wherein the wound electrode assembly is accommodated in the case.
13 . A battery, comprising:
a box body; and
a battery cell according to claim 12 ,
wherein the battery cell is accommodated in the box body.
14 . An electrical device, comprising the battery cell according to claim 12 .
15 . A method for manufacturing a wound electrode assembly, comprising:
providing an electrode sheet, wherein the electrode sheet includes a winding ending section, and the winding ending section is provided with a plurality of first tabs; and
winding the electrode sheet, so that the plurality of the first tabs are laminated;
wherein, among any two adjacent first tabs, a width of the first tab of the two adjacent first tabs that is closest to the winding center of the wound electrode assembly is greater than a width of the first tab of the two adjacent first tabs that is away from the winding center;
wherein
the electrode sheet further comprises a winding start section connected with the winding ending section, the winding start section is provided with at least one second tab, the at least one second tab and the plurality of the first tabs being laminated; and a width of the at least one second tab is greater than or equal to the width of a first tab that is closest to the winding center among the plurality of first tabs.
16 . The wound electrode assembly according to claim 1 , wherein the first tabs and the at least one second tab being arranged such that the at least one second tab and the plurality of the first tabs are laminated on a same side of a thickness center plate of the wound electrode assembly.
17 . A manufacturing apparatus for a wound electrode assembly, comprising:
a providing means, configured to provide an electrode sheet, wherein the electrode sheet comprises a winding ending section, and the winding ending section is provided with a plurality of first tabs; and
an assembling means, configured to wind the electrode sheet around a winding center, so that the plurality of the first tabs are laminated;
wherein, among any two adjacent first tabs, a width of the first tab of the two adjacent first tabs that is closest to the winding center of the wound electrode assembly is greater than a width of the first tab of the two adjacent first tabs that is away from the winding center;
wherein the electrode sheet further comprises a winding start section connected with the winding ending section, the winding start section is provided with at least one second tab, the at least one second tab and the plurality of the first tabs being laminated; and
a width of the at least one second tab is greater than or equal to the width of a first tab that is closest to the winding center among the plurality of first tabs.