# US 12,180,566 B2 · Battery cell housing made of an aluminium alloy strip having a high recycling content

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- Number: US 12,180,566 B2
- Document ID: US12180566B2
- Status: Granted
- Kind: B2
- Application number: 18/621,524
- Filed: 2024-03-29
- Published: 2024-07-18
- Granted: 2024-12-31
- Earliest claimed: 2021-10-05
- Assignees: Speira GmbH
- Applicants: Martin Christoph Lentz; Andreas Siemen; Holger Aretz; Hartmut Janssen; Volker Denkmann; Mathis Ruppert; Thiemo Brüggemann; Waldemar Krieger; Philipp Kramer
- Inventors: Martin Christoph Lentz; Andreas Siemen; Holger Aretz; Hartmut Janssen; Volker Denkmann; Mathis Ruppert; Thiemo Brüggemann; Waldemar Krieger; Philipp Kramer
- Web page: https://patentgrep.com/patent/US12180566B2

## CPC

- C22C 21/08: with silicon
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- C22F 1/047: of alloys with magnesium as the next major constituent
- H01M 50/116: characterised by the material
- H01M 50/119: Metals
- Y02E 60/10: Energy storage using batteries
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- C22F: CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass, C23F17/00)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A battery cell housing having an aluminium alloy strip or sheet. The object of providing a battery cell housing having an aluminium alloy strip or sheet which, on the one hand, makes it possible to achieve recycling rates and, on the other hand, satisfies the requirements of a battery cell housing, in particular with regard to strength, electrolyte stability and electrical and thermal conductivity, is achieved in that the aluminium alloy strip or sheet has an aluminium alloy with the following alloy constituents in wt %: 0.1%≤Si≤0.5%, 0.25%≤Fe≤0.8%, Cu≤0.6%, 0.6%≤Mn≤1.4%, 0.5%≤Fe≤1.5%, Cr≤0.25%, Zn≤0.4%, 0.005%≤Ti≤0.2%, the remainder being Al and unavoidable impurities, individually at most 0.05% and in total at most 0.15%.

## Claims

### Claim 1

Battery cell housing having an aluminium alloy strip or sheet,
wherein,
the aluminium alloy strip or sheet has an aluminium alloy with the following alloy constituents in wt %:
0.1%≤Si≤0.5%,
0.25%≤Fe≤0.8%,
Cu≤0.6%,
0.6%≤Mn≤1.4%,
0.5%≤Mg≤1.5%,
Cr≤0.25%,
Zn≤0.4%,
0.005%≤Ti≤0.2%,
the remainder being Al and unavoidable impurities, individually at most 0.05% and in total at most 0.15%.

### Claim 2 (depends on 1)

Battery cell housing according to claim 1,
wherein,
the aluminium alloy strip or sheet has an aluminium alloy with the following alloy constituents in wt %:
0.2%≤Si≤0.4%, preferably 0.2%≤Si≤0.35%,
0.3%≤Fe≤0.7%, preferably 0.4%≤Fe≤0.7%,
Cu≤0.3%, preferably 0.1%≤Cu≤0.2%,
0.8%≤Mn≤1.1%,
0.8%≤Mg≤1.5%, preferably 0.8%≤Mg≤1.2%,
Cr≤0.1%, preferably Cr≤0.05%,
0.02%≤Zn≤0.25%, preferably 0.04%≤Zn≤0.25%,
0.005%≤Ti≤0.1%, preferably 0.005%≤Ti≤0.05%,
the remainder being Al and unavoidable impurities, individually at most 0.05% and in total at most 0.15%.

### Claim 3 (depends on 1)

Battery cell housing according to claim 1,
wherein,
the aluminium alloy has a proportion of at least 50 wt %, preferably at least 70 wt %, of recycled material.

### Claim 4 (depends on 1)

Battery cell housing according to claim 1,
wherein,
the aluminium alloy strip or sheet has a strain-hardened state of the type HIX, preferably the strain-hardened state H18 or H19.

### Claim 5 (depends on 1)

Battery cell housing according to claim 1,
wherein,
the aluminium alloy strip or sheet has a thickness between 0.1 mm and 2.0 mm, preferably between 0.2 mm and 1.5 mm, particularly preferably between 0.35 mm and 1.2 mm.

### Claim 6 (depends on 1)

Battery cell housing according to claim 1,
wherein,
the aluminium alloy strip or sheet has an electrical conductivity σ of at least 35% IACS.

### Claim 7 (depends on 1)

Battery cell housing according to claim 1,
wherein,
the aluminium alloy strip or sheet, preferably before its
processing to form the battery cell housing, has a yield strength Rp0.2 measured according to DIN EN ISO 6892-1 of at least 180 MPa, preferably at least 220 MPa, particularly preferably at least 250 MPa.

### Claim 8 (depends on 1)

Battery cell housing according to claim 1,
wherein,
the aluminium alloy strip or sheet has a yield strength Rp0.2 measured according to DIN EN ISO 6892-1 of at least 200 MPa at a temperature of 100° C. and/or a yield strength Rp0.2 of at least 150 MPa at a temperature of 200° C.

### Claim 9 (depends on 1)

Battery cell housing according to claim 1,
wherein,
the aluminium alloy strip or sheet, before its processing to form the battery cell housing, has a wall thickness ratio δ of not more than 1.6, preferably not more than 1.4, with respect to steel.

### Claim 10 (depends on 1)

Battery cell housing according to claim 1,
wherein,
the aluminium alloy strip or sheet, before its processing to form the battery cell housing, has an average percentage ear height Z of not more than 4%, preferably not more than 3%, and preferably a maximum percentage ear height Zmax of not more than 6%, preferably not more than 5.5%, in the earing test according to DIN EN 1669.

### Claim 11 (depends on 1)

Use of an aluminium alloy strip or sheet for manufacturing a battery cell housing according to claim 1.

### Claim 12 (depends on 11)

Use according to claim 11,
wherein,
the battery cell housing is a housing of a secondary cell, preferably a lithium-ion secondary cell, a sodium-ion secondary cell or a solid-state secondary cell.

### Claim 13 (depends on 11)

Use according to claim 11,
wherein,
the battery cell housing has a cylindrical design, a prismatic design or a pouch design.

### Claim 14 (depends on 11)

Use according to claim 11,
wherein,
the aluminium alloy strip or sheet is manufactured by a method which comprises the following steps:
casting rolling ingot from an aluminium alloy,
homogenising the rolling ingot,
hot rolling rolling the rolling ingot to form a hot-rolled strip,
cold rolling the hot-rolled strip.

### Claim 15 (depends on 14)

Use according to claim 14,
wherein,
the thickness of the hot-rolled strip is between 1 mm and 15 mm, preferably between 2 mm and 12 mm, particularly preferably between 2 mm and 9 mm.

### Claim 16 (depends on 14)

Use according to claim 14,
wherein,
at least one intermediate anneal takes place during the cold rolling.

### Claim 17 (depends on 14)

Use according to claim 14,
wherein,
the rolling ratio during the cold rolling at final thickness, preferably the rolling ratio after the last intermediate anneal, is at least 20%, preferably at least 50%, particularly preferably at least 70%.