# US 12,603,396 B2 · Electrode assembly, method for manufacturing the same and secondary battery

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- Number: US 12,603,396 B2
- Document ID: US12603396B2
- Status: Granted
- Kind: B2
- Application number: 17/792,363
- Filed: 2021-04-27
- Published: 2023-02-02
- Granted: 2026-04-14
- Earliest claimed: 2020-05-22
- Assignees: LG Energy Solution, Ltd.
- Applicants: LG Energy Solution, Ltd.
- Inventors: Song Yi Han; Ji Hoon Ryu
- Web page: https://patentgrep.com/patent/US12603396B2

## CPC

- H01M 50/533: characterised by the shape of the leads or tabs
- H01M 4/0407: {by coating on an electrolyte layer}
- H01M 4/139: Processes of manufacture
- H01M 4/38: of elements or alloys
- H01M 10/0413: {Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes}
- H01M 10/0436: {Small-sized flat cells or batteries for portable equipment}
- H01M 10/0585: of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
- H01M 50/102: characterised by their shape or physical structure
- H01M 50/528: Fixed electrical connections, i.e. not intended for disconnection
- 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 includes a first electrode and a second electrode alternately stacked with a separator therebetween. The first electrode a first-a electrode and a first-b electrode, in which electrode active material layers have thicknesses different from each other.

## Claims

### Claim 1

An electrode assembly, comprising:
a first electrode having a first electrode active material layer and a second electrode having a second electrode active material layer are alternately stacked with a separator therebetween,
wherein the first electrode comprises a plurality of first-a electrodes and a plurality of first-b electrodes, in which the first electrode active material layer of each first-a electrode is thicker than the first electrode active material layer of each first-b electrode,
wherein each first-a electrode and each first-b electrode comprise a first-a electrode tab and a first-b electrode tab, respectively,
wherein the first-b electrode tab has a width greater than a width of the first-a electrode tab,
wherein the first-a electrode tab and the first-b electrode tab do not overlap in a stacking direction,
wherein the first-b electrode tab and the first-a electrode tab are bonded to a first electrode lead,
wherein the first-b electrode tab and the first-a electrode tab are respectively bonded to a first side and a second side of the first electrode lead without being in direct contact with each other,
wherein the first electrode lead has a first section having a width equal to a greatest width between a side edge of the first-b electrode tab and a side edge the first-a electrode tab and a second section having a width less than the first section, and
wherein a number of the plurality of first-a electrodes is twice a number of the plurality of first-b electrodes.

### Claim 2 (depends on 1)

The electrode assembly of claim 1, wherein the first electrode active material layer of each first-a electrode and the first electrode active material layer of each first-b electrode have the same area.

### Claim 3 (depends on 1)

The electrode assembly of claim 1, further comprising:
a second electrode lead, to which a second electrode tab of the second electrode is bonded.

### Claim 4 (depends on 1)

The electrode assembly of claim 1, wherein the first electrode further comprises a first-c electrode having a same area as each of the first-a electrodes and the first-b electrodes and having a first electrode active material layer, which has a thickness different from that of the first electrode active material layer of each of the first-a electrodes and the first-b electrodes, and
wherein the first electrode active material layer of the first-c electrode has a thickness less than the thickness of the first electrode active material layer of the first-b electrodes.

### Claim 5 (depends on 4)

The electrode assembly of claim 4, wherein the first-c electrode comprises a first-c electrode tab, and
wherein the first-c electrode tab has a width greater than the width of the first-b electrode tab.

### Claim 6

A method for manufacturing an electrode assembly, the method comprising:
a first electrode manufacturing step of manufacturing a first electrode comprising a plurality of first-a electrodes and a plurality of first-b electrodes, in which electrode active material layers have different thicknesses; and
an electrode assembly manufacturing step of alternately stacking a second electrode and the first-a electrode or the first-b electrode of the first electrode with a separator therebetween to manufacture the electrode assembly,
wherein, in the first electrode manufacturing step, non-coating portions, on which the electrode active material does not exist, of the first-a electrode and the first-b electrode are cut to manufacture a first-a electrode tab and a first-b electrode tab,
wherein the first-b electrode tab has a width greater than a width of the first-a electrode tab and the first-a electrode tab and the first-b electrode tab do not overlap in a stacking direction,
after the electrode assembly manufacturing step, an electrode lead bonding step of bonding the first-a electrode tab and the first-b electrode tab to a first electrode lead and bonding a second electrode tab of the second electrode to a second electrode lead,
wherein the first-a electrode tab and the first-b electrode tab are respectively bonded to a first side and a second side of the first electrode lead without being in direct contact with each other,
wherein the first-b electrode tab and the first-a electrode tab are respectively bonded to a first side and a second side of the first electrode lead without being in direct contact with each other,
wherein the first electrode lead has a first section having a width equal to a greatest width between a side edge of the first-b electrode tab and a side edge the first-a electrode tab and a second section having a width less than the first section, and
wherein a number of the plurality of first-a electrodes is twice a number of the plurality of first-b electrodes.

### Claim 7 (depends on 6)

The method of claim 6, wherein the first electrode manufacturing step comprises preparing a plurality of collectors having a same area and changing a loading amount of electrode active material on a surface of each of the plurality of collectors,
wherein the first-a electrode increases in loading amount of electrode active material compared to the electrode active material of the first-b electrode to manufacture an electrode active material layer having a thickness greater than that of the first-b electrode, and
wherein the first-b electrode decreases in loading amount of electrode active material compared to the electrode active material of the first-a electrode to manufacture an electrode active material layer having a thickness less than that of the first-a electrode.

### Claim 8 (depends on 1)

A secondary battery comprising:
the electrode assembly of claim 1; and
a case configured to accommodate the electrode assembly.