# US 12,009,530 B2 · Pouch type battery cell and method for manufacturing the same

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- Number: US 12,009,530 B2
- Document ID: US12009530B2
- Status: Granted
- Kind: B2
- Application number: 18/221,102
- Filed: 2023-07-12
- Published: 2024-01-18
- Granted: 2024-06-11
- Earliest claimed: 2022-07-15
- Assignees: LG Energy Solution, Ltd.
- Applicants: LG Energy Solution, Ltd.
- Inventors: Chang Je Lee; In Seok Lee; Gi Hoon Myoung
- Web page: https://patentgrep.com/patent/US12009530B2

## CPC

- H01M 50/105: Pouches or flexible bags
- B23K 26/206: {Laser sealing}
- B23K 26/244: Overlap seam welding
- B29C 53/36: Bending and joining, e.g. for making hollow articles (B29C53/56 takes precedence)
- H01M 10/049: {Processes for forming or storing electrodes in the battery container}
- H01M 50/119: Metals
- H01M 50/121: Organic material
- H01M 50/124: having a layered structure
- H01M 50/129: with two or more layers of only organic material
- H01M 50/136: Flexibility or foldability
- B23K 2101/36: Electric or electronic devices
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A pouch type battery cell according to an embodiment of the present invention may include an electrode assembly accommodated between a pair of cases, each of which include a first resin layer constituting an innermost layer, a second resin layer constituting an outermost layer, and a metal layer stacked between the first and second resin layers. The pouch type battery cell may include a cup portion, accommodating the electrode assembly, an insulation sealing portion, in which the first resin layers of the pair of cases are sealed to each other, a folded portion, in which an edge of one case of the pair of cases is folded to surround an edge of the other case, and a metal sealing portion, provided on the folded portion, in which the metal layers of the pair of cases are sealed to each other.

## Claims

### Claim 1

A pouch battery cell, in which an electrode assembly is accommodated between a pair of cases, each of which comprises a first resin layer constituting an innermost layer, a second resin layer constituting an outermost layer, and a metal layer stacked between the first resin layer and the second resin layer, the pouch type battery cell comprising:
a cup portion provided in at least one of the pair of cases and configured to accommodate the electrode assembly;
an insulation sealing portion on which the first resin layers of the pair of cases are sealed to each other;
a folded portion in which an edge of one case of the pair of cases is folded around a terminal end of an edge of the other case to surround the edge of the other case; and
a metal sealing portion, provided on the folded portion, in which the metal layers of the pair of cases are sealed directly to each other.

### Claim 2 (depends on 1)

The pouch type battery cell of claim 1, wherein the metal sealing portion is disposed outside the insulation sealing portion.

### Claim 3 (depends on 1)

The pouch type battery cell of claim 1, wherein the metal sealing portion comprises:
a first metal sealing portion on which one surface of the metal layer of the other case is sealed to the metal layer of the one case; and
a second metal sealing portion on which the other surface of the metal layer of the other case is sealed to the metal layer of the one case.

### Claim 4 (depends on 1)

The pouch type battery cell of claim 1, wherein the first resin layer and the second resin layer are excluded from the metal sealing portion.

### Claim 5 (depends on 1)

The pouch type battery cell of claim 1, wherein the first resin layer is excluded from the metal sealing portion, and
the second resin layer is excluded from at least one outward facing surface of the one case.

### Claim 6 (depends on 1)

The pouch type battery cell of claim 1, wherein the metal layer comprises a stainless-steel material.

### Claim 7

A method for manufacturing a pouch battery cell, in which an electrode assembly is accommodated between a pair of cases, each of which comprises an innermost first resin layer, an outermost second resin layer, and a metal layer stacked between the first resin layer and the second resin layer, the method comprising:
accommodating the electrode assembly in a cup portion formed in at least one of the pair of cases;
sealing the first resin layers of the pair of cases to each other;
forming a folded portion by folding an edge of one case of the pair of cases around a terminal end of an edge of the other case to surround the edge of the other case; and
sealing the metal layers of the one case and the other case on the folded portion directly to each other.

### Claim 8 (depends on 7)

The method of claim 7, wherein, the sealing of the first resin layers includes thermally fusing the first resin layers to each other, and
the sealing of the metal layers includes welding the metal layers to each other using a laser.

### Claim 9 (depends on 7)

The method of claim 7, wherein the edge of each of the pair of cases comprises an exposed region in which the first resin layer is excluded and an inner surface of the metal layer of the other case is exposed to an exposed region of the one case.

### Claim 10 (depends on 7)

The method of claim 7, wherein, the folded portion comprises a region from which the second resin layer is excluded, and the sealing the metal layers includes emitting a laser onto the region from which the second resin layer is excluded.

### Claim 11

A pouch battery cell, in which an electrode assembly is accommodated between a first case and a second case, each case comprises a first resin layer constituting an innermost layer, a second resin layer constituting an outermost layer, and a metal layer stacked between the first resin layer and the second resin layer, the pouch type battery cell comprising:
a cup portion provided in at least the first case or the second case and arranged to accommodate the electrode assembly;
an insulation sealing portion in which the first resin layer of the first case is sealed to the first resin layer of the second case;
a folded portion in which an edge of the second case is folded around a terminal end of an edge of the first case so that the edge of the second case faces one surface of the edge of the first case and an opposite facing surface of the edge of the first case; and
a metal sealing portion including a first metal sealing portion directly sealing the metal layers of the edge of the second case and the one surface of the edge of the first case, and a second metal sealing portion directly sealing the metal layers of the edge of the second case and the opposite facing surface of the edge of the first case.

### Claim 12 (depends on 11)

The pouch type battery cell of claim 11, wherein the metal sealing portion is provided outside the insulation sealing portion.

### Claim 13 (depends on 11)

The pouch type battery cell of claim 11, wherein the first case and the second case are integrally formed, and the pouch type battery cell includes a folding line between the first case and the second case.

### Claim 14 (depends on 13)

The pouch type battery cell of claim 13, wherein each of the first case and the second case further include an edge surrounding the cup portion on three sides, and the insulation sealing portion and the metal sealing portion are provided on each of the three sides.

### Claim 15 (depends on 11)

The pouch type battery cell of claim 11, wherein the first case is manufactured separately from the second case and subsequently joined to the second case, and each of the first case and the second case further include an edge surrounding four sides of the cup portion, wherein the insulation sealing portion and the metal sealing portion are provided on each of the four sides.

### Claim 16 (depends on 11)

The pouch type battery cell of claim 11, wherein the second resin layer is excluded from at least a part the folded portion.

### Claim 17 (depends on 16)

The pouch type battery cell of claim 16, wherein the second resin layer is excluded from an entirety of the folded portion.

### Claim 18 (depends on 11)

The pouch type battery cell of claim 11, wherein the metal layer comprises a stainless-steel material.