Battery cell and electric device

Patent metadata

Field	Value
Publication number	US-2025023200-A1
Application number	US-202418768652-A
Country	US
Kind code	A1
Filing date	Jul 10, 2024
Priority date	Jul 10, 2023
Publication date	Jan 16, 2025
Grant date	—

Abstract

An electrode assembly of a battery cell includes a first electrode plate and a first tab. The first tab is electrically connected to the first electrode plate. The first tab is located in a straight region. The first tab at least partially protrudes from a surface of the first electrode plate in a second direction. The first electrode plate includes a first winding terminating section located in the straight region and a first bending section located in a bending region. One end of the first winding terminating section is connected to the first bending section, and another end of the first winding terminating section is a first winding terminating end of the first electrode plate. When viewed in the second direction, the first tab and the first winding terminating section do not overlap.

First claim

What is claimed is:

1 . A battery cell, comprising:
an electrode assembly, wherein the electrode assembly is a wound structure, the electrode assembly comprises a straight region and a bending region, and in a first direction, at least one end of the straight region is connected to the bending region; and the electrode assembly comprises a first electrode plate and a first tab, wherein the first tab is electrically connected to the first electrode plate, the first tab is located in the straight region, the first tab at least partially protrudes from a surface of the first electrode plate in a second direction, the first electrode plate comprises a first winding terminating section located in the straight region and a first bending section located in the bending region, one end of the first winding terminating section is connected to the first bending section, and another end of the first winding terminating section is a first winding terminating end of the first electrode plate; wherein when viewed in the second direction, the first tab and the first winding terminating section do not overlap; and an extension direction of a winding axis of the electrode assembly, the first direction, and the second direction are perpendicular to each other.

2 . The battery cell according to claim 1 , wherein the first electrode plate is a positive electrode plate, and the first tab is a positive electrode tab; wherein the first electrode plate comprises a positive electrode current collector and a first positive electrode active substance layer, the first positive electrode active substance layer is disposed on a side of the positive electrode current collector in a thickness direction, and the first tab is connected to a surface of the first positive electrode active substance layer facing away from the positive electrode current collector and is electrically connected to the positive electrode current collector.

3 . The battery cell according to claim 1 , wherein the first winding terminating section and the first bending section are connected at a first connection position, and when viewed in the second direction, the first winding terminating section is located between the first connection position and the first tab in the first direction.

4 . The battery cell according to claim 1 , wherein the electrode assembly further comprises a second electrode plate with a polarity opposite to a polarity of the first electrode plate, and in the second direction, the first tab is located between the first electrode plate and the second electrode plate.

5 . The battery cell according to claim 4 , wherein the first electrode plate further has a first winding starting end; and in a winding direction of the electrode assembly, a length of the first electrode plate is L 1 , and a largest distance between the first winding starting end and the first tab is L 2 , wherein L 1 /4≤L 2 ≤3L 1 /4.

6 . The battery cell according to claim 1 , wherein the first electrode plate is a positive electrode plate, and the electrode assembly further comprises a second electrode plate, wherein the second electrode plate is a negative electrode plate; the second electrode plate comprises a second winding terminating section located in the straight region and a second bending section located in the bending region, one end of the second winding terminating section is connected to the second bending section, another end of the second winding terminating section is a second winding terminating end of the second electrode plate, the second winding terminating section is located on an outer side of the first winding terminating section; and in a winding direction of the electrode assembly, the second winding terminating section exceeds the first winding terminating section; and
when viewed in the second direction, the first tab and the second winding terminating section do not overlap.

7 . The battery cell according to claim 6 , wherein the second winding terminating section and the second bending section are connected at a second connection position; and when viewed in the second direction, the second winding terminating section is located between the second connection position and the first tab in the first direction.

8 . The battery cell according to claim 1 , wherein the battery cell further comprises a first protection member, and the first protection member covers a surface of the first tab.

9 . The battery cell according to claim 8 , wherein when viewed in the second direction, the first protection member and the first winding terminating section do not overlap.

10 . The battery cell according to claim 9 , wherein the electrode assembly further comprises a second electrode plate with a polarity opposite to a polarity of the first electrode plate, the first electrode plate is a positive electrode plate, the second electrode plate is a negative electrode plate, the second electrode plate comprises a second winding terminating section located in the straight region and a second bending section located in the bending region, one end of the second winding terminating section is connected to the second bending section, another end of the second winding terminating section is a second winding terminating end of the second electrode plate, the second winding terminating section is located on an outer side of the first winding terminating section; and in a winding direction of the electrode assembly, the second winding terminating section exceeds the first winding terminating section; and
when viewed in the second direction, the first protection member and the second winding terminating section do not overlap.

11 . The battery cell according to claim 10 , wherein the bending region comprises a first bending region and a second bending region, and the first bending region and the second bending region are respectively connected to two ends of the straight region in the first direction;
the first electrode plate has a first winding starting end, and the second electrode plate has a second winding starting end, wherein the first winding starting end, the first winding terminating end, and the second winding terminating end are all disposed facing the second bending region, the second winding starting end is disposed facing the first bending region, and the first winding starting end is closer to the second bending region than the second winding terminating end; and when viewed in the second direction, the first protection member and the first tab are located between the first winding starting end and the second winding terminating end.

12 . The battery cell according to claim 11 , wherein a largest distance between the first tab and the first winding starting end is W 4 , and a smallest distance between the first tab and the first winding starting end is N 4 , wherein 2 mm≤W 4 −N 4 ≤20 mm.

13 . The battery cell according to claim 12 , wherein in the first direction, a largest distance between the first protection member and the first winding starting end is W 5 , and a smallest distance between the first protection member and the first winding starting end is N 5 , and 3 mm≤W 5 −N 5 ≤23 mm.

14 . The battery cell according to claim 13 , wherein 0.5 mm<N 5 <N 4 .

15 . The battery cell according to claim 13 , wherein (W 5 −N 5 )>(W 4 −N 4 ).

16 . The battery cell according to claim 1 , wherein the electrode assembly further comprises a second electrode plate and a second tab, the second tab is electrically connected to the second electrode plate, the first electrode plate is a positive electrode plate, the second electrode plate is a negat

Assignees

• Ningde Amperex Technology Ltd

Inventors

• Liu Ning
• Lv Fang
• Yang Jianhui
• Li Chenchen

Classifications

• H01M10/0587 Primary

  of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M50/533 Primary

  characterised by the shape of the leads or tabs · CPC title

• H01M50/538

  Connection of several leads or tabs of wound or folded electrode stacks · CPC title

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title