# US 12,191,475 B2 · Electrode assembly, secondary battery, battery module, battery pack and electrical device

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- Number: US 12,191,475 B2
- Document ID: US12191475B2
- Status: Granted
- Kind: B2
- Application number: 17/933,855
- Filed: 2022-09-21
- Published: 2023-04-13
- Granted: 2025-01-07
- Earliest claimed: 2021-10-13
- Assignees: Contemporary Amperex Technology (Hong Kong) Limited
- Applicants: Contemporary Amperex Technology (Hong Kong) Limited
- Inventors: Tao Zhang; Jianfu He; Qian Liu; Xueyang Sun; Yonghuang Ye
- Web page: https://patentgrep.com/patent/US12191475B2

## CPC

- H01M 4/13: Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M 4/0404: {by coating on electrode collectors}
- H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/139: Processes of manufacture
- H01M 4/366: {as layered products}
- H01M 4/661: {Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence)}
- H01M 10/0431: {Cells with wound or folded electrodes (H01M10/045 takes precedence)}
- H01M 10/052: Li-accumulators
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/058: Construction or manufacture
- H01M 10/0585: of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
- H01M 10/0587: of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
- H01M 10/42: Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells (H01M10/60 takes precedence)
- H01M 10/4235: {Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence)}
- H01M 50/105: Pouches or flexible bags
- H01M 50/119: Metals
- H01M 50/46: Separators, membranes or diaphragms characterised by their combination with electrodes
- H01M 50/55: on the same side of the cell
- H01M 50/103: prismatic or rectangular (H01M50/109, H01M50/11 take precedence)
- H01M 50/15: for prismatic or rectangular cells (H01M50/153 takes precedence)
- H01M 2004/021: {Physical characteristics, e.g. porosity, surface area}
- H01M 2004/027: {Negative electrodes}
- H01M 2004/028: {Positive electrodes}
- H01M 2010/4292: {Aspects relating to capacity ratio of electrodes/electrolyte or anode/cathode}
- H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane
- Y02E 60/10: Energy storage using batteries
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

An electrode assembly, secondary battery, battery module, battery pack and electrical device are provided. In some embodiments, the electrode assembly comprises a positive electrode plate, a negative electrode plate and a separator disposed between the positive electrode plate and the negative electrode plate, the positive electrode plate satisfies 0<CAP1/CAP2<1, in which CAP1 represents capacity of the first positive electrode film layer in Ah, CAP2 represents capacity of the second positive electrode film layer in Ah, and the electrode assembly satisfies R4/R3−R2/R1≥0, in which R1 represents resistance of the first positive electrode film layer in Ω, R2 represents resistance of the second positive electrode film layer in Ω, R3 represents resistance of the first negative electrode film layer in mΩ and R4 represents resistance of the second negative film layer in mΩ. The present applicant may extend the cycle life of the secondary battery.

## Claims

### Claim 1

An electrode assembly, comprising
a positive electrode plate comprising a positive electrode current collector and a first positive electrode film layer and a second positive electrode film layer located on two opposite surfaces of the positive electrode current collector,
a negative electrode plate comprising a negative electrode current collector and a first negative electrode film layer and a second negative electrode film layer located on two opposite surfaces of the negative electrode current collector; and
a separator disposed between the positive electrode plate and the negative electrode plate, wherein the first positive electrode film layer is located on a side of the positive electrode current collector close to the separator and the second negative electrode film layer is located on a side of the negative electrode current collector near the separator, wherein
the positive electrode plate satisfies 0<CAP1/CAP2<1, wherein CAP1 represents capacity of the first positive electrode film layer in Ah, CAP2 represents capacity of the second positive electrode film layer in Ah, and
the negative electrode plate satisfies 0≤R4/R3≥30, the positive electrode plate satisfies 0<R2/R1≤20, the electrode assembly satisfies R4/R3−R2/R1≥0, wherein R1 represents resistance of the first positive electrode film layer in Ω, R2 represents resistance of the second positive electrode film layer in Ω, R3 represents resistance of the first negative electrode film layer in mΩ and R4 represents resistance of the second negative film layer in mΩ,
the second positive electrode film layer comprises a second positive electrode base layer and at least one second positive electrode conductive carbon layer disposed on at least one of two opposite surfaces of the second positive electrode base layer,
the positive electrode plate satisfies R2<R1.

### Claim 2 (depends on 1)

The electrode assembly of claim 1, wherein the electrode assembly satisfies 0≤R4/R3−R2/R1≤20.

### Claim 3 (depends on 1)

The electrode assembly of claim 1, wherein the positive electrode plate satisfies 0.33≤CAP1/CAP2<1.

### Claim 4 (depends on 1)

The electrode assembly of claim 1, wherein
0Ω<R1≤20Ω,
0Ω<R2≤20Ω,0mΩ<R3≤200mΩ, and/or
0mΩ<R4≤200mΩ.

### Claim 5 (depends on 1)

The electrode assembly of claim 1, wherein the first positive electrode film layer comprises a first positive electrode active material, the second positive electrode film layer comprises a second positive electrode active material, and the positive electrode plate satisfies one or more of the following:
(1) a coating weight of the first positive electrode film layer is less than a coating weight of the second positive electrode film layer,
(2) a gram capacity of the first positive electrode active material is less than a gram capacity of the second positive electrode active material, or
(3) w1<w2, in which w1 represents a mass percentage of the first positive electrode active material based on the total mass of the first positive electrode film layer, and w2 represents a mass percentage of the second positive electrode active material based on the total mass of the second positive electrode film layer.

### Claim 6 (depends on 1)

The electrode assembly of claim 1, wherein the negative electrode plate satisfies R4/R3≥1, and the electrode assembly satisfies 0<R4/R3−R2/R1≤20.

### Claim 7 (depends on 6)

The electrode assembly of claim 6, wherein the negative electrode plate satisfies 1≤R4/R3≤30.

### Claim 8 (depends on 1)

The electrode assembly of claim 1, wherein the negative electrode plate satisfies 0<R4/R3<1, the positive electrode plate satisfies 0<R2/R1<1, and the electrode assembly satisfies 0≤R4/R3−R2/R1<1.

### Claim 9 (depends on 8)

The electrode assembly of claim 8, wherein
the negative electrode plate satisfies 0<R4/R3<1, and
the positive electrode plate satisfies 0.05≤R2/R1≤0.9.

### Claim 10 (depends on 8)

The electrode assembly of claim 8, wherein
the negative electrode plate satisfies 0.05≤R4/R3<0.9, and
the positive electrode plate satisfies 0.05≤R2/R1≤0.9.

### Claim 11 (depends on 1)

The electrode assembly of claim 1, wherein the positive electrode plate satisfies R2/R1=1, and the negative electrode plate satisfies R4/R3=1.

### Claim 12 (depends on 1)

The electrode assembly of claim 1, wherein,
the first negative electrode film layer comprises a first negative electrode base layer and at least one first negative electrode conductive carbon layer disposed on at least one of two opposite surfaces of the first negative electrode base layer,
the negative electrode plate satisfies R3<R4.

### Claim 13 (depends on 1)

A secondary battery comprising an outer package, an electrolyte, and the electrode assembly according to claim 1.

### Claim 14 (depends on 13)

The secondary battery of claim 13, wherein the outer package includes a casing and a cover plate, the casing has an accommodating cavity and an opening, the electrode assembly is accommodated in the accommodating cavity, and the cover plate is used to close the opening of the casing.

### Claim 15 (depends on 13)

A battery module comprising the secondary battery according to claim 13.

### Claim 16 (depends on 13)

A battery pack, comprising one of the secondary battery according to claim 13.

### Claim 17 (depends on 13)

An electrical device comprising at least one of the secondary battery according to claim 13.

### Claim 18

An electrode assembly comprising
a positive electrode plate comprising a positive electrode current collector and a first positive electrode film layer and a second positive electrode film layer located on two opposite surfaces of the positive electrode current collector,
a negative electrode plate comprising a negative electrode current collector and a first negative electrode film layer and a second negative electrode film layer located on two opposite surfaces of the negative electrode current collector; and
a separator disposed between the positive electrode plate and the negative electrode plate, wherein the first positive electrode film layer is located on a side of the positive electrode current collector close to the separator and the second negative electrode film layer is located on a side of the negative electrode current collector near the separator, wherein
the positive electrode plate satisfies 0<CAP1/CAP2<1, wherein CAP1 represents capacity of the first positive electrode film layer in Ah, CAP2 represents capacity of the second positive electrode film layer in Ah, and
the negative electrode plate satisfies 0≤R4/R3≤30, the positive electrode plate satisfies 0<R2/R1≤20, the electrode assembly satisfies R4/R3−R2/R1≥0, wherein R1 represents resistance of the first positive electrode film layer in Ω, R2 represents resistance of the second positive electrode film layer in Ω, R3 represents resistance of the first negative electrode film layer in mΩ and R4 represents resistance of the second negative film layer in mΩ,
the first positive electrode film layer comprises a first positive electrode base layer and at least one first positive electrode ceramic layer disposed on at least one of two opposite surfaces of the first positive electrode base layer, the first positive electrode ceramic layer comprises one or more of alumina ceramics, silicon nitride ceramics, silicon carbide ceramics, and boron nitride ceramics,
the positive electrode plate satisfies R2<R1.

### Claim 19 (depends on 18)

The electrode assembly of claim 18, wherein,
the second negative electrode film layer comprises a second negative electrode base layer and at least one second negative electrode ceramic layer disposed on at least one of two opposite surfaces of the second negative electrode base layer, the second negative electrode ceramic layer comprises one or more of alumina ceramics, silicon nitride ceramics, silicon carbide ceramics, and boron nitride ceramics,
the negative electrode plate satisfies R3<R4.

### Claim 20 (depends on 18)

The electrode assembly of claim 18, wherein the first positive electrode film layer comprises a first positive electrode active material, the second positive electrode film layer comprises a second positive electrode active material, and the positive electrode plate satisfies one or more of the following:
(1) a coating weight of the first positive electrode film layer is less than a coating weight of the second positive electrode film layer,
(2) a gram capacity of the first positive electrode active material is less than a gram capacity of the second positive electrode active material, or
(3) w1<w2, in which w1 represents a mass percentage of the first positive electrode active material based on the total mass of the first positive electrode film layer, and w2 represents a mass percentage of the second positive electrode active material based on the total mass of the second positive electrode film layer.