Jelly-roll battery cell and electrochemical device

Patent metadata

Field	Value
Publication number	US-12562401-B2
Application number	US-202217708952-A
Country	US
Kind code	B2
Filing date	Mar 30, 2022
Priority date	Mar 12, 2020
Publication date	Feb 24, 2026
Grant date	Feb 24, 2026

Abstract

A jelly-roll battery cell includes a first electrode plate, a second electrode plate, and a separator, and includes a central region enclosed by the first electrode plate, the second electrode plate, and the separator, and has a thickness direction. The first electrode plate includes: a first current collector, where the first current collector includes a first surface and a second surface opposite to the first surface, and the first surface is closer to the central region than the second surface; a first section; and a second section, where a first tab is disposed on the first surface in the second section. The second electrode plate includes a second tab whose first side is on the second electrode plate. The first end, the first tab, and the second tab do not overlap in a thickness direction.

First claim

What is claimed is:

1 . A jelly-roll battery cell, comprising:
a first electrode plate, a second electrode plate, and a separator; wherein the separator is disposed between the first electrode plate and the second electrode plate; the first electrode plate, the second electrode plate, and the separator are wound to form the jelly-roll battery cell; and the jelly-roll battery cell has a thickness direction and a winding center that is enclosed by the first electrode plate, the second electrode plate, and the separator; the first electrode plate comprises a first current collector, wherein the first current collector comprises a first surface and a second surface opposite to the first surface, the first surface facing the winding center and the second surface facing away from the winding center; the first current collector comprises a first section and a second section; wherein the first section has a first end and a second end, and the first end is a winding initiation end of the first electrode plate; the second section has a third end and a fourth end, the third end is connected to the second end, the second section is flat, and a first tab is disposed on the first surface in the second section; the second electrode plate comprises a second tab, wherein the second tab has a first side and a second side opposite to the first side, and the first side is on the second electrode plate; wherein the first end, the first tab, and the second tab do not overlap in the thickness direction.

2 . The jelly-roll battery cell according to claim 1 , wherein the separator has a fifth end and a sixth end; the fifth end is a winding initiation end of the separator; the sixth end is a winding termination end of the separator; and the fifth end does not overlap the first end, the first tab, or the second tab in the thickness direction.

3 . The jelly-roll battery cell according to claim 2 , wherein the sixth end does not overlap the first tab or the second tab in the thickness direction.

4 . The jelly-roll battery cell according to claim 2 , wherein the separator has a first boundary line, a part from the first boundary line to the fifth end constitutes a first part of the separator, a shape of the first part is curved or flat, and the first part does not overlap the first tab or the second tab in the thickness direction.

5 . The jelly-roll battery cell according to claim 1 , further comprising a first insulation adhesive, wherein the first insulation adhesive overlays a winding termination end of the second electrode plate, and the first insulation adhesive does not overlap the first tab or the second tab in the thickness direction.

6 . The jelly-roll battery cell according to claim 1 , wherein a winding termination end of the second electrode plate does not overlap the first tab or the second tab in the thickness direction.

7 . The jelly-roll battery cell according to claim 1 , wherein no first active material layer is disposed on the first surface or the second surface in the first section, no first active material layer is disposed on the first surface in the second section, and the first active material layer is disposed on the second surface in the second section.

8 . The jelly-roll battery cell according to claim 1 , wherein the first current collector further comprises a third section and a fourth section; wherein
the third section has a seventh end and an eighth end, and the seventh end is connected to the fourth end; the fourth section has a ninth end and a tenth end, the ninth end is connected to the eighth end, and the tenth end is a winding termination end of the first electrode plate; and no first active material layer is disposed on the first surface in the third section, the first active material layer is disposed on the second surface in the third section, and the first active material layer is disposed on the first surface and the second surface in the fourth section.

9 . The jelly-roll battery cell according to claim 8 , wherein the separator located between the second section and the third section is provided with a coating or not provided with a coating.

10 . The jelly-roll battery cell according to claim 2 , wherein the second electrode plate comprises a second current collector, the second current collector comprises a third surface and a fourth surface opposite to the third surface, the third surface is closer to the central region than the fourth surface; and the second current collector further comprises:
a fifth section, a sixth section, and a seventh section, wherein the fifth section has an eleventh end and a twelfth end, and the eleventh end is a winding initiation end of the second electrode plate; the sixth section has a thirteenth end and a fourteenth end, and the thirteenth end is connected to the twelfth end; the seventh section has a fifteenth end and a sixteenth end, the fifteenth end is connected to the fourteenth end, and the sixteenth end is a winding termination end of the second electrode plate; and a second active material layer is disposed on the third surface and the fourth surface in the fifth section, the second active material layer is disposed on the third surface in the sixth section, no second active material layer is disposed on the third surface or the fourth surface in the seventh section.

11 . The jelly-roll battery cell according to claim 10 , wherein
the fifth section comprises a first subsection, a second subsection, a third subsection, a fourth subsection, and a fifth subsection; the first subsection, the third subsection, and the fifth subsection are flat; the second subsection and the fourth subsection are curved; the first subsection is a starting subsection of the fifth section; the second subsection is connected to the first subsection; the third subsection is connected to the second subsection; the fourth subsection is connected to the third subsection; and the fifth subsection is an ending subsection of the fifth section; the sixth section comprises a sixth subsection, a seventh subsection, an eighth subsection, and a ninth subsection; the sixth subsection and the eighth subsection are curved; the seventh subsection and the ninth subsection are flat; the sixth subsection is a starting subsection of the sixth section; the seventh subsection is connected to the sixth subsection; the eighth subsection is connected to the seventh subsection; the ninth subsection is connected to the eighth subsection; and the ninth subsection is an ending subsection of the sixth section; the seventh section comprises a tenth subsection and an eleventh subsection, the tenth subsection is curved, the eleventh subsection is flat, and the tenth subsection is a starting subsection of the seventh section, and the eleventh subsection is an ending subsection of the seventh section; and a second insulation adhesive is disposed on the fourth surface in the sixth subsection, an initiation end and a termination end of the second insulation adhesive overlap an initiation end and a termination end of the sixth subsection respectively, and the initiation end of the sixth subsection is connected to the fifth section; and, a third insulation adhesive is disposed on the third surface in the tenth subsection, an initiation end and a termination end of the third insulation adhesive overlap an initiation end and a termination end of the tenth subsection respectively, and the initiation end of the tenth subsection is connected to the sixth section.

12 . The jelly-roll battery cell according to claim 11 , wherein the sixth end extends beyond the termination ends of the second insulation adhesive and the third insulation adhesive, or the sixth

Assignees

• Ningde Amperex Technology Ltd

Inventors

• Yang Dian
• Yan Congfei

Classifications

• H01M50/531

  Electrode connections inside a battery casing · CPC title

• H01M50/46

  Separators, membranes or diaphragms characterised by their combination with electrodes · CPC title

• H01M50/538 Primary

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

• Y02E60/10

  Energy storage using batteries · CPC title

• Y02P70/50

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