# US 9,437,898 B2 · Secondary battery including plurality of electrode assemblies

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- Number: US 9,437,898 B2
- Document ID: US9437898B2
- Status: Granted
- Kind: B2
- Application number: 14/283,650
- Filed: 2014-05-21
- Published: 2014-09-11
- Granted: 2016-09-06
- Earliest claimed: 2013-01-07
- Assignees: LG Chem, Ltd.
- Applicants: LG Chem, Ltd.
- Inventors: Sun Woo Lee; Hyun Jong Yang; Jae Dong Chang
- Web page: https://patentgrep.com/patent/US9437898B2

## CPC

- H01M 10/0436: {Small-sized flat cells or batteries for portable equipment}
- H01M 10/0413: {Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes}
- H01M 10/0585: of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
- H01M 2004/021: {Physical characteristics, e.g. porosity, surface area}
- 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

Disclosed is a secondary battery including a plurality of electrode assemblies. The secondary battery includes a first electrode assembly including a first cathode, a first separator and a first anode, and a second electrode assembly including a second cathode, a second separator and a second anode, wherein, when an electrode plate area of the second electrode assembly is smaller than that of the first electrode assembly, a cross-sectional thickness of the second electrode assembly is larger than that of the first electrode assembly.

## Claims

### Claim 1

A secondary battery comprising:
a first electrode assembly comprising a first cathode, a first separator and a first anode; and
a second electrode assembly comprising a second cathode, a second separator and a second anode,
wherein the second electrode assembly is stacked on the first electrode assembly,
wherein an electrode plate area of the second electrode assembly is smaller than an electrode plate area of the first electrode assembly,
wherein a cross-sectional thickness of the second electrode assembly is larger than a cross-sectional thickness of the first electrode assembly,
wherein the electrode plate area of the first electrode assembly and the electrode plate area of the second electrode assembly are expressed by the following Equation:
0.5≦S2/S1≦0.98
where S1 is the electrode plate area of the first electrode assembly, and S2 is the electrode plate area of the second electrode assembly,
wherein the cross-sectional thickness of the first electrode assembly and the cross-sectional thickness of the second electrode assembly are expressed by the following Equation:
0≦I1/I2≦0.2
where I1 is the cross-sectional thickness of the first electrode assembly, and I2 is the cross-sectional thickness of the second electrode assembly, and
wherein the electrode material used for the second electrode assembly has a higher efficiency than that used for the first electrode assembly.

### Claim 2 (depends on 1)

The secondary battery of claim 1, wherein a cathode coating portion of the second cathode of the second electrode assembly is thicker than that of the first cathode of the first electrode assembly.

### Claim 3 (depends on 1)

The secondary battery of claim 1, wherein an anode coating portion of the second anode of the second electrode assembly is thicker than that of the first anode of the first electrode assembly.

### Claim 4 (depends on 1)

The secondary battery of claim 1, wherein the first cathode and the second cathode have a cathode collector in which a cathode active material is coated on one or both surfaces thereof.

### Claim 5 (depends on 1)

The secondary battery of claim 1, wherein a standard capacity per unit area of the first cathode is 0.0121 to 0.0123 Ah/cm2.

### Claim 6 (depends on 1)

The secondary battery of claim 1, wherein a standard capacity per unit area of the second cathode is 0.0123 to 0.0126 Ah/cm2.

### Claim 7 (depends on 1)

The secondary battery of claim 1, wherein the first anode and the second anode have an anode collector in which an anode active material is coated on one or both surfaces thereof.

### Claim 8 (depends on 1)

The secondary battery of claim 1, wherein a standard capacity per unit area of the first anode is 0.0132 to 0.0136 Ah/cm2.

### Claim 9 (depends on 1)

The secondary battery of claim 1, wherein a standard capacity per unit area of the second anode is 0.0135 to 0.0139 Ah/cm2.

### Claim 10 (depends on 1)

The secondary battery of claim 1, wherein the first electrode assembly and the second electrode assembly have the same battery capacity.

### Claim 11 (depends on 1)

A medium or large size battery module comprising two or more secondary batteries of claim 1 which are electrically connected with each other.

### Claim 12 (depends on 11)

A medium or large size battery pack comprising two or more battery modules of claim 11 which are electrically connected with each other.

### Claim 13 (depends on 1)

The secondary battery of claim 1, wherein a standard capacity per unit area of the first cathode is 0.0121 to 0.0123 Ah/cm2, and
wherein a standard capacity per unit area of the second cathode is 0.0123 to 0.0126 Ah/cm2.

### Claim 14 (depends on 1)

The secondary battery of claim 1, wherein a standard capacity per unit area of the first anode is 0.0132 to 0.0136 Ah/cm2, and
wherein a standard capacity per unit area of the second anode is 0.0135 to 0.0139 Ah/cm2.