# US 2025/0096401 A1 · Battery cell

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- Number: US 2025/0096401 A1
- Document ID: US20250096401A1
- Status: Published application
- Kind: A1
- Application number: 18/965,474
- Filed: 2024-12-02
- Published: 2025-03-20
- Earliest claimed: 2022-05-30
- Assignees: W. L. Gore & Associates, Inc.; Volkswagen Aktiengesellschaft
- Applicants: W. L. Gore & Associates GmbH; Volkswagen Aktiengesellschaft
- Inventors: Tim DAGGER; Daniel KEGLMEIER; Anton KILLER; Paul MEISTER; Joachim MUELLER; Andreas SAENGER; Piotr WRZUSZCZAK; Wenbo ZHANG; Branislav ZLATKOV
- Web page: https://patentgrep.com/patent/US20250096401A1

## CPC

- H01M 50/3425: {in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member}
- H01M 50/394: {Gas-pervious parts or elements}
- H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane
- Y02E 60/10: Energy storage using batteries
- 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

## Abstract

A battery cell having a cell casing in which a number of electrodes are arranged. The cell casing has a rupture region. The rupture region having an opening. The opening being covered by a gas-permeable membrane.

## Claims

### Claim 1

A battery cell comprising:
a cell casing, in which at least two electrodes are arranged; and
a rupture region having an opening that is covered by a gas-permeable membrane.

### Claim 2 (depends on 1)

The battery cell according to claim 1, wherein the membrane is designed such that it tears when a pressure difference between a pressure outside the cell casing and a pressure inside the cell casing exceeds a first limit value.

### Claim 3 (depends on 2)

The battery cell according to claim 2, wherein the rupture region is designed such that it breaks when the pressure difference between the pressure outside the cell casing and the pressure inside the cell casing exceeds a second limit value that is greater than the first limit value.

### Claim 4 (depends on 1)

The battery cell according to claim 1, wherein the membrane is attached to an outer side of the cell casing.

### Claim 5 (depends on 4)

The battery cell according to claim 4, wherein the membrane rests on a side facing away from the cell casing on a stabilizing element that has additional openings.

### Claim 6 (depends on 1)

The battery cell according to claim 1, wherein the membrane is arranged on an inward-facing side of the rupture region, and wherein the membrane is partially supported on the rupture region via spacers.

### Claim 7 (depends on 1)

The battery cell according to claim 1, wherein the cell casing comprises a base body with an additional opening into which a rupture disc is inserted, wherein the rupture region comprises the rupture disc.

### Claim 8 (depends on 1)

The battery cell according to claim 1, wherein a wall thickness of the cell casing is reduced in the rupture region.

### Claim 9 (depends on 1)

The battery cell according to claim 1, wherein the cell casing has a notch in the rupture region, via which an external contour of the rupture region is delimited.

### Claim 10 (depends on 1)

The battery cell according to claim 1, wherein the opening is surrounded by a drying element.