Electrode plate and manufacturing method therefor, electrode assembly, secondary battery, and power consuming device

Patent metadata

Field	Value
Publication number	US-12444775-B2
Application number	US-202418409803-A
Country	US
Kind code	B2
Filing date	Jan 11, 2024
Priority date	Jun 15, 2022
Publication date	Oct 14, 2025
Grant date	Oct 14, 2025

Abstract

Lithium replenishing spaces are disposed on a current collection structure, such that the lithium replenishing spaces communicate with an active layer on one side; and the battery is replenished with lithium by using lithium replenishing agents in the lithium replenishing spaces to offset an irreversible lithium consumption in a cycle process, so as to increase the total capacity and the energy density of the battery. According to the present application, due to average weights M A of corresponding active materials in different distribution regions on the active layer, a sum V0 of internal volumes of lithium replenishing spaces corresponding to each of the distribution regions is controlled in a positively correlated manner based on a change in the average weights of the active materials in the different distribution regions.

First claim

The invention claimed is:

1. An electrode plate, comprising:
a current collection structure; and
two active layers respectively arranged on two opposite side surfaces of the current collection structure along a thickness direction of the current collection structure, wherein a plurality of lithium replenishing spaces used to communicate with one of the active layers on one side are arranged on the current collection structure, and the lithium replenishing spaces accommodate lithium replenishing agents, wherein
in distribution regions on the active layer communicating with the lithium replenishing spaces, average weights of active materials per unit area of the active layer are denoted as M A , sums of internal volumes of the lithium replenishing spaces that are covered by projections of the distribution regions along the thickness direction of the current collection structure are denoted as V0, and the distribution regions comprise at least a first distribution region and a second distribution region; and
M A in the first distribution region is less than M A in the second distribution region, and corresponding V0 in the first distribution region is less than corresponding V0 in the second distribution region.

2. The electrode plate according to claim 1 , wherein a depth of each of the lithium replenishing spaces is denoted as d, and a thickness of each of the active layers corresponding to positions of the lithium replenishing spaces is denoted as h; and
h in the first distribution region is less than h in the second distribution region, and corresponding d in the first distribution region is less than corresponding d in the second distribution region.

3. The electrode plate according to claim 2 , wherein the depth d of each of the lithium replenishing spaces satisfies the following relationship:

d
≤

C
A

×

M
A

-

C
C

×

M
C

3
⁢
8
⁢
6
⁢
0
×

0
.
5

⁢
3
⁢
4
×

(

1
×
P

)

×
1
⁢
0
⁢
0
⁢
0
⁢
0

,

wherein
C A is an initial lithium intercalation capacity of a negative electrode active material in mAh/g, C C is an initial lithium deintercalation capacity of a positive electrode active material in mAh/g, M C is an average weight of active materials per unit area of a positive electrode in g/cm 2 , and P is a proportion of opening areas of all lithium replenishing spaces per unit area on the current collection structure, wherein, optionally, the proportion P of the opening areas of all the lithium replenishing spaces per unit area satisfies the following relationship:
10%≤P≤50%.

4. The electrode plate according to claim 2 , wherein the depth d of each of the lithium replenishing spaces satisfies the following relationship:

d
≥

(

C
.
E

.
C

-

C
.
E

.
A

)

×

C
A

×

M
A

3
⁢
8
⁢
6
⁢
0
*

0
.
5

⁢
3
⁢
4
*

(

1
*
P

)

×
1
⁢
0
⁢
0
⁢
0
⁢
0

,

wherein
C.E. C is an initial coulombic efficiency of the positive electrode active material, C.E. A is an initial coulombic efficiency of the negative electrode active material, and C A is the initial lithium intercalation capacity of the negative electrode active material in mAh/g;

and/or
wherein the lithium replenishing spaces are arranged at intervals in one of the active lavers on at least one side, and any adjacent two of the lithium replenishing spaces have an equal spacing.

5. The electrode plate according to claim 1 , wherein the current collection structure comprises at least one current collector along the thickness direction of the current collection structure, the lithium replenishing spaces penetrating through at least one of current collectors provided with the active layers.

6. The electrode plate according to claim 5 , wherein the current collection structure comprises two current collectors, the two active layers are respectively disposed on two side surfaces, facing away from each other, of the two current co

Assignees

• Contemporary Amperex Technology Hong Kong Ltd

Inventors

• Chen Xingbu
• Ye Yonghuang
• Sun Xin
• Wu Lili
• Liu Rundie
• Li Xuan
• Dong Miaomiao
• Yun Liang
• Song Peidong

Classifications

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M4/62

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

• H01M4/139

  Processes of manufacture · CPC title

• H01M10/0585

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