Spliced lithium strip, preparation method thereof, and related negative electrode plate, battery core, lithium ion battery, battery module, battery pack and apparatus

Patent metadata

Field	Value
Publication number	US-11223050-B2
Application number	US-202117345134-A
Country	US
Kind code	B2
Filing date	Jun 11, 2021
Priority date	Aug 2, 2019
Publication date	Jan 11, 2022
Grant date	Jan 11, 2022

Abstract

The present application provide a spliced lithium strip, preparation method thereof, and related negative electrode plate, battery core, lithium ion battery, battery module, battery pack and apparatus. The spliced lithium strip is formed by splicing two or more base lithium strips, wherein the base lithium strip has a thickness fluctuation of less than 5%; the spliced lithium strip has a spliced area and a non-spliced area alternately distributed along the splicing direction, and the spliced area has a maximum thickness H and the non-spliced area has a minimum thickness L, satisfying



H
-
L



L

×
1
⁢
0
⁢
0
⁢
%

≤

6
⁢

%
.

First claim

What is claimed is:

1. A spliced lithium strip formed by splicing two or more base lithium strips, wherein
the base lithium strip has a thickness fluctuation of less than 5%;
the spliced lithium strip has a spliced area and a non-spliced area alternately distributed along the splicing direction, and the spliced area has a maximum thickness H and the non-spliced area has a minimum thickness L, satisfying



H
-
L



L

×
1
⁢
0
⁢
0
⁢
%

≤

6
⁢
%

.

2. The spliced lithium strip according to claim 1 , wherein the spliced area comprises a body region and a transition region, and the transition region of each spliced area is adjacent to the non-spliced area, and each body region has a width of 0.1 mm to 3 0.5 mm, optionally 1 mm to 3 mm.

3. The spliced lithium strip according to claim 1 , wherein the spliced area comprises two protrusions opposite to each other along the thickness direction of the spliced lithium strip, and the two protrusions respectively protrude from the two surfaces of the non-spliced area in the thickness direction, and each of the protrusions in the thickness direction has a cross section in a trapezoidal or trapezoid-like shape, and each trapezoid or trapezoid shape has a lower bottom angle of 0.02 degree or less, optionally 2×10 −3 degree or less, or 1×10 −4 degree to 2×10 −3 degrees.

4. The spliced lithium strip according to any one of claim 1 , wherein the thickness fluctuation of the base lithium strip is 3% or less, optionally 2.5% or less.

5. The spliced lithium strip according to any one of claim 1 , wherein the maximum thickness H of the spliced area and the minimum thickness L of the non-spliced area satisfy



H
-
L



L

×
100
⁢
%

≤

5
⁢

%
.

6. The spliced lithium strip according to any one of claim 1 , wherein the width of the base lithium strip is 170 mm or less, optionally 80 mm to 160 mm, or 80 mm to 130 mm.

7. The spaced lithium strip according to any one of claim 1 , wherein the thickness of the base lithium strip is (12 mm to 4 mm, optionally 0.5 mm to 3 mm, or 1 mm to 2 mm.

8. The spliced lithium strip according to any one of claim 1 , wherein the base lithium strip has a Mohs hardness of 0.6 to 2.5, optionally 0.6 to 2.0, 0.6 to 1.5, or 0.6 to 1.0.

9. The spliced lithium strip according to claim 2 , wherein the spliced lithium strip is formed by splicing two or more base lithium strips in the width direction thereof, and the spliced area and the non-spliced area are alternately distributed in the width direction of the spliced lithium strip.

10. The spliced lithium strip according to claim 9 , wherein, relative to a side edge in the width direction of the spliced lithium strip itself, the position of the body region in the width direction fluctuates within 1 mm.

11. A method for preparing a spliced lithium strip, including:
providing two or more base lithium strips, each of which has a thickness fluctuation of less than 5%;
splicing the two or more base lithium strips one by one, so that the edges of two adjacent base lithium strips are overlapped with each other, and pressing together to obtain the spliced lithium strip;
wherein, the spliced lithium strip has a spliced area and a non-spliced area alternately distributed along the splicing direction, and the spliced area has a maximum thickness H and the non-spliced area has a minimum thickness L, satisfying



H
-
L



L

×
1
⁢
0
⁢
0
⁢
%

≤

6
⁢

%
.

12. The method according to claim 11 , wherein
the two or more base lithium strips are sequentially spliced along their own width direction, and edges of the two adjacent base lithium strips that are overlapped with each other has a width of 0.1 mm to 3.5 mm;
before the pressing together, the method further includes correcting the deviation of the two or more spliced base lithium strips, taking the outer edge of the outermost base lithium strip as a reference, the overlapped area where the edges of the two adjacent base lithium strips are stacked on each other has a position fluctuation in the width direction within 1 mm.

13. A negative electrode plate, comprising: a negative current collector; a negative active material layer disposed on the negative electrode current collector; a lithium-based metal layer disposed on the negative active material layer, wherein the lithium-based metal layer is formed by laminating the spliced lithium strip according to claim 1 .

14. A battery core comprising the negative electrode plate according to claim 13 .

15. A lithium ion battery comprising the battery core according to claim 14 and an electrolyte.

16. A battery module comprising the lithium ion battery according to claim 15 .

17. A battery pack comprising the battery module according to claim 16 .

18. An apparatus comprising at least one of the lithium ion battery according to claim 15 .

Assignees

• Contemporary Amperex Technology Co Ltd

Inventors

• Xie Bin
• Chen Shitong
• Gong Zhijie

Classifications

• H01M4/62 Primary

  Selection of inactive substances as ingredients for active masses, e.g. binders, fillers · CPC title

• H01M4/382 Primary

  Lithium (H01M4/405 takes precedence) · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M4/661 Primary

  Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence) · CPC title

• H01M10/0525

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