Wound cell having single-side coated areas

Patent metadata

Field	Value
Publication number	US-10651511-B2
Application number	US-201715649820-A
Country	US
Kind code	B2
Filing date	Jul 14, 2017
Priority date	Sep 22, 2016
Publication date	May 12, 2020
Grant date	May 12, 2020

Abstract

Provided is a wound cell, formed by winding of a first and second separator, a first and second electrode plate from start ends thereof, outermost circle of second electrode plate includes second single-side coated area, surface of which facing center of the wound cell is second blank current collector area not coated with second active material, portion of first electrode plate opposite to second blank current collector area includes first single-side coated area, surface of which away from the center of the wound cell is first blank current collector area not coated with first active material; tail end of first electrode plate contains first blank foil area, portion of second electrode plate opposite to first blank foil area contains second blank foil area; start ends of first and second single-side coated area are located at two opposite sides in thickness direction of the cell.

First claim

What is claimed is:

1. A wound cell, wherein the wound cell comprises a flat-shaped cell formed by winding of a first separator, a first electrode plate, a second separator and a second electrode plate from respective start ends thereof, a first electrode tab is connected with the first electrode plate, a second electrode tab is connected with the second electrode plate; the first electrode plate comprises a first current collector with a first active material coated on two opposite surfaces of the first current collector, the second electrode plate comprises a second current collector with a second active material coated on two opposite surfaces of the second current collector,
wherein an outermost circle of the second electrode plate that is farthest from a center of the wound cell comprises a second single-side coated area, a surface of the second single-side coated area facing the center of the wound cell is a second blank current collector area which is not coated with the second active material and a surface of the second single-side coated area facing away from the center of the wound cell is coated with the second active material, a portion of the first electrode plate opposite to the second blank current collector area comprises a first single-side coated area, a surface of the first single-side coated area away from the center of the wound cell is a first blank current collector area which is not coated with the first active material and a surface of the first single-side coated area facing towards the center of the wound cell is coated with the first active material;
a tail end of the first electrode plate comprises a first blank foil area, a portion of the second electrode plate opposite to the first blank foil area comprises a second blank foil area;
with respect to the thickness direction of the flat-shaped cell, a start end of the first blank foil area and a start end of the second single-side coated area are respectively located at two opposite sides of the flat-shaped cell.

2. The wound cell according to claim 1 , wherein a projection of the first electrode tab and/or the second electrode tab along a thickness direction of the flat-shaped cell overlaps with the second single-side coated area.

3. The wound cell according to claim 1 , wherein a projection of the first electrode tab and/or the second electrode tab along the thickness direction of the flat-shaped cell overlaps with the first blank foil area.

4. The wound cell according to claim 1 , wherein a length of the first blank foil area is larger than a length of the second blank foil area.

5. The wound cell according to claim 1 , wherein a length of the first blank foil area is no larger than a length of the first single-side coated area, and/or a length of the second blank foil area is no larger than a length of the second single-side coated area.

6. The wound cell according to claim 1 , wherein a length of the first separator and/or the second separator is larger than a length of the first blank foil area.

7. The wound cell according to claim 1 , wherein a distance from the start end of the first separator to the first electrode tab is a length of a head portion of the first separator, a distance from the start end of the second separator to the first electrode tab is a length of a head portion of the second separator;
the head portion of the first separator is back folded in an interior of the flat-shaped cell to form a separator back folded section or both the head portion of the first separator and the head portion of the second separator are back folded in an interior of the flat-shaped cell to form a separator back folded section, and a projection of the separator back folded section along the thickness direction of the flat-shaped cell does not overlap with either the first electrode tab or the second electrode tab.

8. The wound cell according to claim 1 , wherein a distance from the start end of the second electrode plate to the second electrode tab is a length of a head portion of the second electrode plate, the head portion of the second electrode plate is back folded in an interior of the flat-shaped cell to form a second electrode plate back folded section; and/or a distance from the start end of the first electrode plate to the first electrode tab is a length of a head portion of the first electrode plate, the head portion of the first electrode plate is back folded in the interior of the flat-shaped cell to form a first electrode plate back folded section; in a projection along the thickness direction of the flat-shaped cell, the first electrode plate back folded section and/or the second electrode plate back folded section do not overlap with either the first electrode tab or the second electrode tab.

9. The wound cell according to claim 1 , wherein the start end of the first separator is connected with the start end of the second separator.

10. The wound cell according to claim 1 , wherein the first electrode plate is a positive electrode plate, the second electrode plate is a negative electrode plate; or, the first electrode plate is a negative electrode plate, the second electrode plate is a positive electrode plate.

Assignees

• Ningde Amperex Technology Ltd

Inventors

• Xiao Liangzhen
• Zeng Qiao
• Wang Kefei

Classifications

• H01M10/0587 Primary

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

• H01M10/286

  Cells or batteries with wound or folded electrodes · CPC title

• H01M10/14

  Assembling a group of electrodes or separators · CPC title

• H01M10/0525

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

• H01M10/125

  Cells or batteries with wound or folded electrodes · CPC title