ARCASA PRISMATIC BATTERY CELL WITH LOW CO2 FOOTPRINT.

Abstract

The invention relates to a prismatic battery cell housing made of aluminum, a method for manufacturing a prismatic battery cell housing, and the use of aluminum for manufacturing such a housing. The objective of providing prismatic battery cell housings with a reduced CO2 footprint, specifying a method for their manufacture, and proposing the use of aluminum for manufacturing prismatic battery cell housings is achieved for the prismatic battery cell housing by the fact that the housing is made of aluminum with a ratio between the amount of carbon dioxide emitted (CO2e) during the manufacture of the aluminum material in kgCO2e per kg of Al material and the yield strength Rp0.2 of the aluminum material in MPa of CO2e / Rp0.2 = 6.15 kgCO2e / (MPa * kgAl material).

Description

[0001] March 28, 2024 Prismatic battery cell housing with a low carbon footprint. The invention relates to a prismatic battery cell housing comprising an aluminum material, a method for producing a prismatic battery cell housing, and a use of an aluminum material for producing a prismatic battery cell housing. Battery cells can generally be divided into primary cells, which can only be discharged once and cannot be recharged, and secondary cells, which are rechargeable. For both primary and secondary cells, the necessary electrochemical processes that enable the battery cell to function can be realized using a variety of different materials. Examples of primary cells in this context include alkaline manganese cells, zinc carbon cells, nickel oxyhydroxide cells, or lithium iron sulfide cells, to name just a few.Examples of secondary cells include lithium-ion cells, sodium-ion cells, nickel-cadmium cells, nickel-metal hydride cells, and nickel-zinc cells, to name just a few. Lithium-ion secondary cells have been increasingly used in recent years, particularly in the fields of electromobility and consumer electronics, due, among other things, to their comparatively high gravimetric and volumetric energy density. Like other types of battery cells, lithium-ion secondary cells have a battery cell casing. This forms the outer shape of the battery cell and encloses a cavity containing, among other things, the anode material, the cathode material, and an electrolyte. Different battery cell casing designs can be distinguished: Cylindrical battery cell casings essentially have the shape of a cylinder.If the height of the cylinder is greater than the diameter, they are called round cells; otherwise, they are called button cells. Prismatic battery cell housings are essentially shaped like a prism, particularly a cuboid. Another variant is the pouch design, in which the battery cell housing is essentially shaped like a pocket or bag. Prismatic battery cell housings consist of a battery cell housing shell, which has a substantially rectangular cross-section and thus enables a simple and space-saving arrangement of battery cells. Prismatic battery cell housings also have a battery cell housing base and a battery cell housing cover with means for contacting the two electrical poles of the battery cell.Newer prismatic cell designs enable lateral contacting of the battery cell. In this case, the cell casing corresponds to a tube with a rectangular cross-section, closed at both ends with lids that also contain the terminals, i.e., the contact points. This design is primarily used when the prismatic cells have an elongated design, whereby the cell length can be in the range of 1000 mm. For example, US patent application US 2022 / 0102787 A1 discloses a battery cell casing arrangement that has a battery cell volume of more than 50% by using individual, elongated, prismatic battery cells. How the individual prismatic battery cell casings are manufactured is not disclosed.The use of lithium-ion secondary cells for storing electrical energy represents a key technology in combating global climate change, as it enables highly efficient and economical storage of electrical energy. At the same time, the production of lithium-ion secondary cells causes greenhouse gas emissions, which are quantified using CO2 equivalents (CO2e). Therefore, whenever greenhouse gas emissions or CO2 emissions are mentioned below, their CO2 equivalents (CO2e) are always meant. According to a Z. I / ZI 230145WOMarch 28, 2024, according to a European battery manufacturer's 2021 report, approximately 10% of greenhouse gas emissions are caused by the provision of the mechanical components of a battery cell alone, in this case, the battery cell housing. Prismatic battery cell housings, for example, are currently made from sheets of an AA3003 aluminum alloy in the H14 temper with a yield strength Rp0.2 of more than 125 MPa. Due to its composition, this aluminum alloy type is based on the use of primary aluminum. Primary aluminum is aluminum produced directly from the raw material bauxite or from the alumina extracted from it. Because it is produced in aluminum smelters, it is also referred to as primary aluminum.Considering the greenhouse gas emissions of primary metal consumed in Europe (8.6 kgCO2e / kgAl material) up to the production of the rolling ingot, between 3 and 4% of the greenhouse gas emissions from the production of a prismatic battery cell for this primary aluminum-based aluminum material are attributable to the production of the battery cell casing. However, there are plans to reduce greenhouse gas emissions during battery cell production by a factor of 10, from the current level of approximately 100 kgCO2e / kWh to approximately 10 kgCO2e / kWh. This could increase the share of greenhouse gas emissions from the battery cell casing per kWh to as much as 30 to 40% of the greenhouse gas emissions of the entire battery cell per kWh, unless the share of greenhouse gas emissions or CO2 equivalents from the battery cell casing is reduced.The report “ENVIROMENTAL PROFILE REPORT, Life-Cycle Inventory Data for Aluminium Production and Transformation Processes in Europe, February 2018” (https: / / european-aluminium.eu / wp-content / uploads / 2023 / 01 / European-Aluminium_Environmental-Profile-Report-2018_full-version.pdf) discloses the greenhouse gas emissions, quantified as CO2 equivalents (CO2e) in kgCO2e, that are generated during the production of aluminium and aluminium alloy products in Europe. I / ZI 230145WOMarch 28, 2024, Europe. The CO2 equivalents in the report were determined according to the ISO 14040 and 14044 standards. The standards therefore provide a predefined procedure for determining CO2 equivalents. The identical standards have been used to determine CO2 equivalents in other regions, for example, for aluminum production in North America in the Aluminum Association's report "The Environmental Footprint of Semi-Fabricated Aluminum Products in North America, A Life Cycle Assessment Report" (https: / / www.aluminum.org / sites / default / files / 2022-01 / 2022_Semi-Fab_LCA_Report.pdf). Michael Zotter's thesis entitled "Life-Cycle Analysis of Lightweight Concepts for Automotive Engineering," published at Graz University of Technology in April 2014, also relies on the international standards ISO 14040 and ISO 14044 for determining CO2 equivalents. In the professional world, CO2 equivalents are therefore determined according to the two aforementioned standards.All CO2 equivalents in kgCO2e mentioned below therefore refer in particular to CO2 equivalents in kgCO2e determined according to ISO 14040 and ISO 14044. Based on this, the present invention is based on the object of providing prismatic battery cell housings with a reduced CO2 footprint, specifying a method for their production and proposing an aluminum material for use in the production of prismatic battery cell housings. According to the invention, the above-mentioned object is achieved for a prismatic battery cell housing comprising an aluminum material forming the battery cell housing in that the aluminum material has a ratio of the mass of carbon dioxide (CO2e) emitted during the production of the aluminum material in kgCO2e per kgAl material to the yield strength Rp0.2 of the aluminum material CO2e / Rp0.2 of a maximum of 6.15% kgCO2e / (MPa*kgAl material), Z. I / ZI 230145WOMarch 28, 2024 preferably has a CO2e / Rp0.2 of maximum 5% kgCO2e / (MPa*kgAl material), particularly preferably a CO2e / Rp0.2 of maximum 4% kgCO2e / (MPa*kgAl material) or a maximum of 2% kgCO2e / (MPa*kgAl material), whereby the yield strength Rp0.2 is measured according to DIN EN ISO 6892-1 at room temperature. It has been found that with an aluminum material with a CO2e / Rp0.2 ratio of maximum 6.15% kgCO2e / (MPa*kgAl material), a reduction in greenhouse gas emissions in the production of battery cell casings of approximately 10% can be achieved compared to the primary metal-based reference material AA3003 in the H14 temper with a yield strength Rp0.2 of more than 125 MPa, which with greenhouse gas emissions of 8.6 kgCO2e / kgAl material. The CO2e / Rp0.2 ratio can be used to indicate the savings in greenhouse gas emissions in the form of CO2 from the aluminum material, regardless of the exact aluminum alloy classification.The ratio therefore indicates a material property of the aluminum material. The claimed upper limit, taking into account the form factors of the battery cell housing and the reference material AA3003 in the H14 temper with a yield strength of 125 MPa, therefore indicates a reduction in greenhouse gas emissions for the production of a prismatic battery cell housing. This takes into account both the specifications of the previous standard material for the prismatic battery cell housing and the possibilities of different production methods for the aluminum material to avoid CO2 emissions. The starting point for the following considerations is that the prismatic battery cell housing meets at least the strength requirements met by the previous standard material made of an aluminum alloy AA3003 in the H14 temper with Rp0.2 of 125 MPa. I / ZI 230145WOMarch 28, 2024. Fig. 1 schematically shows a prismatic battery cell housing with a length l, a width a, and a depth b. The wall thickness of the aluminum material is denoted by s. For the following calculations, it is assumed for simplification that the prismatic battery cell housing consists of a battery cell housing shell with a rectangular cross-section and two covers, with the covers being assumed to be of the same thickness. This represents a simplification, particularly in the case of a deep-drawn or extruded prismatic battery cell housing, since the thickness of the battery cell housing cover and the thickness of the battery cell housing base present due to the forming process can differ. The approximation of two covers of equal thickness is used to simplify the calculations, as there is no significant influence on the calculated greenhouse gas emission change.In addition, a density of ^^Alu = 2.7 g / cm³ is assumed approximately for all aluminum materials. To derive the required wall thickness of the aluminum material, the practical scenario of internal pressure loading for battery cell housings is considered. For simplification, the battery cell housing is assumed to be a closed and thin-walled prismatic tube. By imaginarily cutting through the symmetry planes of the prismatic tube, the respective stresses acting there can be calculated using the force equilibrium as follows: mit σ ^^ : stress in the section in the symmetry plane perpendicular to dimension b, σ ^^ : stress in the section in the symmetry plane perpendicular to the dimension a, σ ^^ : stress in the cutting surface in the symmetry plane perpendicular to dimension l, geometry factor, defined as ξ ≝ ^^ / ^^, Z I / ZI 230145WOMarch 28, 2024 ^^: Acting internal pressure. Depending on the ratio ^^ / ^^, of the three possible stresses {σ ^^; σ ^^; σ ^^}, the maximum stress σ max either σ ^^ oder σ ^^ . For the minimum stress σ min In the present situation, σmin = − ^^ applies. The equivalent stress according to Tresca besagt: σ V,Tresca = σ max − σ min = max{σ ^^ , σ ^^} + ^^ (2) Since the internal pressure is negligible compared to the other acting stresses, one can simplify the writing:σ V,Tresca ≈ max{σ ^^ , σ ^^} (3) The pipe is now pushed towards the beginning of flow or the yield point ^^ p0,2 designed: This relationship can be described as follows:[m ^^ ^^ ax {( ^^∙ ^^ ) , ( ^^ )} − 2] (5) The following geometric assumption is now introduced: max { ( ^^ ^^∙ ^^) , ( ^^^^)} ≫ 2 (6) This gives the approximation: ^ ^^ 1 max {( ^ ^^∙ ^^) , ( ^^ ^^)} − 2 ≈ max {( ^^∙ ^^) , ( ^^ ^^)} = ^^ ^^ ⋅ max { ξ , 1} (7) Z I / ZI 230145WO March 28, 2024 This gives the simplified relationship: Converted according to the internal pressure ^^ this results in: Two tubes made of different materials are now considered, which have different wall thicknesses s, but otherwise identical dimensions a, b and l. At the same internal pressure, one then obtains^^p0.2,Alu ∙ ^^Alu = ^^p0.2,3003Std ∙ ^^3003Std (10) Based on this, the wall thickness of the aluminum material is calculated in relation to the reference material, an aluminum alloy AA3003 in temper H14 with a yield strength of 125 MPa:^^ ^^ A lu =p0.2,3003hr^ ^p0,2,Alu ∙ ^^ 3003Std (11) with ^^ Alu : wall thickness of the substitute aluminum material, ^^ 3003Std: Wall thickness of the reference material AA3003 in temper H14, ^^ p0,2,Alu : Yield strength Rp0.2 of the substitute aluminum material, ^^p0.2,3003Std: Yield strength Rp0.2 of the reference material with ^^p0.2,3003Std= 125 MPa. Z I / ZI 230145WO March 28, 2024For the lid of the prismatic battery cell housing, a different relationship arises from the internal pressure stability requirement. Based on the Näherung: ^^ p0,2 σ ^^ ≈ max ^^ where p is the internal pressure in the prismatic battery cell casing and σmax is the maximum stress of the cover material according to Tresca, results from the proportionality of the relationship between stress and pressure at a wall thickness s for a plate with a uniform compressive load acting normal to the surface (e.g. Dubbel, "Handbook for Mechanical Engineering", 19th edition, Springer Verlag 1997: Chapter C, "Strength of Materials") When comparing two materials with identical geometry, (13) results in Starting from the reference material of an aluminum alloy of type AA3003 in temper H14 with a given wall thickness of the cover, if the identical internal pressure stability is met, the wall thickness of the new aluminum material follows; The mass w of the battery cell casing of the reference material is approximately calculated from the cross-sectional area multiplied by the length l and the density Z I / ZI 230145WO March 28, 2024 ^^3003 ^^ ^^ ^^= ^^3003 ^^ ^^ ^^* V = ^^ ^^ ^^ ^^ * l * 2* ^^3003 ^^ ^^ ^^* (a+b) (16)The mass ^^ ^^ ^^ ^^ of the battery cell casing shell can be determined by inserting the wall thickness ratio from (11) to: To approximately determine the mass of the lid, the lid area is multiplied by the wall thickness and the density^^3003 ^^ ^^ ^^, ^^= ^^ ∗ ^^ ∗ ^^3003 ^^ ^^ ^^, ^^∗ ^^ ^^ ^^ ^^(18)The mass of the lid according to the invention is developed analogously using the same relationship, using the wall thickness ratio. This results in: The total mass is the sum of the mass of the battery cell casing and the two covers The percentage change in greenhouse gas emissions for the prismatic battery cell casing is calculated using the products of the respective masses in kg of the battery cell casing and the respective mass of the emitted greenhouse gases as CO2 equivalents in kgCO2e per kg of the respective material:Z I / ZI 230145WO March 28, 2024 ^^ ^^2 ^^, ^^ ^^ ^^, ^^ ^^2 ^^,3003 ^^ ^^ ^^: emitted mass of greenhouse gases expressed as CO2 equivalents in kgCO2e / kgAlu or 3003Std, where the index "Alu" indicates the values ​​for the greenhouse gas emission-saving aluminum material. For the aluminum material according to the invention with a CO2e / Rp0.2 ratio of maximum 6.15% kgCO2e / (MPa*kgAl material), based on, for example, the PHEV2+ format of the prismatic battery cell housing with a length of 148 mm, a width of 91 mm and a depth of 26.5 mm, an initial thickness of the standard material AA3003H14 of s30003Std = 0.5 mm and an initial thickness of the cover of s3003Std,D = 1.5 mm, CO2 emissions savings of more than 9%. These savings can be based on an increase in the yield strength, a reduction in the CO2 emissions of the aluminum material used, or a combination of these measures. erfolgen.To achieve greater savings in CO2 emissions, the selected aluminum material preferably has a CO2e / Rp0.2 ratio of a maximum of 5% kgCO2e / (MPa*kgAl material), particularly preferably a maximum of 4% kgCO2e / (MPa*kgAl material), or particularly preferably a maximum of 2% kgCO2e / (MPa*kgAl material). Based on the prismatic battery cell housings in the PHEV2+ format with the above-mentioned wall thicknesses, CO2 emission savings of at least 20% are achieved at a maximum of 5% kgCO2e / (MPa*kgAl material), particularly preferably at least 32% at a maximum of 4% kgCO2e / (MPa*kgAl material), or particularly preferably at least 60% at a maximum of 2% kgCO2e / (MPa*kgAl material). I / ZI 230145WOMarch 28, 2024 According to a first embodiment, the prismatic battery cell housing has a length (l) of a maximum of 1200 mm, preferably a maximum of 600 mm, particularly preferably a maximum of 300 mm, a width (a) of a maximum of 500 mm, preferably a maximum of 300 mm, particularly preferably a maximum of 200 mm, and a depth (b) of a maximum of 90 mm, preferably a maximum of 60 mm, particularly preferably a maximum of 40 mm, wherein the battery cell housing optionally has a format HEV 1, HEV 2, PHEV 1 PHEV 2, BEV 1, BEV 2, BEV 3, BEV 4 according to DIN 91252 2016-11, PHEV 2+, or a sword format. Prismatic battery cell housings with the above-mentioned dimensions allow a compact arrangement of battery cell housings that is specific to the respective application and designed, for example, with regard to optimized heat dissipation. Preferred format types of the prismatic battery cell housings are the formats HEV1, HEV 2, PHEV 1 PHEV 2, BEV 1, BEV 2, BEV 3, BEV 4 according to DIN 912522016-11, but also the format PHEV2 +.All of the formats mentioned are used for battery-electric vehicles. The preferred PHEV2+ format has a length (l) of 148 mm, a width (a) of 125 mm, and a depth (b) of 26.5 mm. auf. Further preferred are so-called prismatic battery cell housings in "sword format," also called "blade format," which allow direct use in a "cell-to-pack" design, thus eliminating the need for battery cell module formation. The preferred sword formats are characterized by a particularly large length (l) of up to a maximum of 1200 mm, with a width (a) of a maximum of 300 mm, preferably 200 mm, and a depth (b) of a maximum of 60 mm, preferably a maximum of 40 mm. According to a further advantageous embodiment, the aluminum material is a wrought aluminum material. Wrought aluminum materials have the property of allowing high degrees of deformation, as required for the production of prismatic battery cell housings. At the same time, they provide a very dense Z I / ZI 230145WOMarch 28, 2024Microstructure compared to cast aluminum materials, so that the sealing requirements of the prismatic battery cell housings can also be met können.A preferred heat-treatable wrought aluminum material is provided by AA6xxx aluminum alloys. These can be extruded into a battery cell casing in the form of prismatic tubes, which, when fitted with two battery cell covers, can form the battery cell casing. This provides a more economical manufacturing process. Compared to heat-treatable wrought aluminum materials, naturally hard wrought aluminum materials can be manufactured using simpler manufacturing processes, which can generally also result in lower CO2 emissions. For example, high-temperature annealing steps, such as those required for solution heat-treatable alloys, can be avoided.With regard to thermal joining processes, such as those used in the welding of prismatic battery cells, the naturally hard aluminum materials exhibit a significantly lower tendency to decrease in strength and generally have good corrosion resistance. Optionally, the naturally hard aluminum materials consist of an aluminum alloy of the type AA1xxx, AA3xxx, AA5xxx, or AA8xxx, the manufacturing processes for which are well known. According to a further embodiment, lower greenhouse gas emissions are achieved if the battery cell housing is made of an aluminum alloy of the type AA1050, AA1100, AA1200, AA3003, AA3004, AA3104, AA3005, AA3105, AA5005, AA5052, AA5454, AA5754, AA5182, AA5083, AA5086, AA8006, AA8008, AA8010, AA8011, AA8111, AA8021, AA8026, AA8050, or AA8079. Using these alloy types, different manufacturing paths for the prismatic battery cell casing can be pursued. I / ZI 230145WOMarch 28, 2024 For example, the lower-alloyed aluminum alloy of the 1xxx alloy class is particularly suitable for extrusion processes, while aluminum alloys of type AA3003, AA3004, AA3104, AA3005, or AA3105 provide high degrees of deformation in the production of battery cell housings, for example from sheet metal blanks, but also good to very good welding properties. At the same time, alloy types AA3004, AA3104, AA3005, or AA3105 are particularly recycling-friendly and enable high proportions of recycled material. The higher magnesium content of aluminum alloy types AA5005, AA5052, AA5454, AA5754, AA5182, AA5083, or AA5086 not only leads to excellent forming properties, but can also provide particularly high yield strengths, even in the soft state, so that savings potential in terms of greenhouse gas emissions can be maximized through lower wall thicknesses of the battery cell casing.At the same time, alloy types AA5052, AA5454, AA5754, AA5182, AA5083, and AA5086 allow for a high proportion of recycled material due to their chemical composition. Alloy types AA8006, AA8008, AA8010, AA8011, AA8111, AA8021, AA8026, AA8050, and AA8079, thanks to their wider alloy window compared to AA1xxx alloys, not only allow for higher recycled content but also enable higher strengths. Due to their high permissible iron content, these alloys are particularly suitable for accepting Fe-containing scrap. The aluminum material of the battery cell housing preferably has a yield strength Rp0.2 of at least 100 MPa, preferably at least 150 MPa, and particularly preferably at least 175 MPa. Soft aluminum materials with yield strengths Rp0.2 of less than 100 MPa often allow particularly high degrees of deformation, but require Z to provide sufficient strength. I / ZI 230145WOMarch 28, 2024: higher wall thicknesses compared to standard material AA3003 in temper H14. Starting at a yield strength of 100 MPa, based on an identical battery cell format and maintaining a constant gravimetric energy density, CO2 emission savings can be realized primarily through savings in aluminum production, particularly through the use of external scrap and the use of primary aluminum containing a high proportion of primary aluminum produced with renewable energy. At higher yield strengths of at least 150 MPa or at least 175 MPa, these savings are supplemented by material savings, which also have a positive impact on reducing greenhouse gas emissions. The average CO2 emissions for primary aluminum used in the European Union (EU) are 8.6 kgCO2e / kgAl.Therefore, if the aluminum material of the battery cell housing preferably consists at least partially of primary aluminum, the amount of CO2 emitted per kg of aluminum material of the battery cell housing during its production being a maximum of 6.7 kgCO2e / kgAl, preferably a maximum of 5 kgCO2e / kgAl, particularly preferably a maximum of 4 kgCO2e / kgAl, significant reductions in greenhouse gas emissions can also be achieved through the primary metal content. Corresponding values ​​for greenhouse gas emissions per kg of primary aluminum can be achieved by using renewably generated energy during production, in particular renewably generated electricity. A maximum of 4 kgCO2e / kgAl is achieved if the primary metal is produced entirely using renewable energies, i.e., CO2-neutral energies.If, during the production of the aluminum material of the battery cell housing, the greenhouse gas emissions per kg of aluminum material of the battery cell housing amount to a maximum of 4 kgCO2e / kgAl material, preferably a maximum of 3 kgCO2e / kgAl material, particularly preferably a maximum of 2 kgCO2e / kgAl material, the inventive CO2e / Rp0.2 ratio of a maximum of 6.15% kgCO2e / (MPa*kgAl material) can also be achieved using less solid aluminum materials, for example AA1xxx alloys. For this purpose, Z. I / ZI 230145WOMarch 28, 2024, the proportion of external scrap and / or post-consumer scrap must be selected accordingly. According to a further teaching of the present invention, the above-mentioned object for a method for producing a battery cell housing according to the invention is achieved in that the method comprises forming the aluminum material and preferably includes deep drawing, ironing, extrusion, extrusion, or roll forming of the aluminum material. Deep drawing, ironing, extrusion, or extrusion are forming processes that enable economical production of the battery cell housings. At the same time, however, the manufacturing processes also set limits for the use of specific aluminum alloys. For example, softer wrought aluminum alloys such as AA1050 are preferred in extrusion or extrusion processes.A method for producing prismatic battery cell housings that particularly efficiently avoids CO2 emissions can be provided by producing the aluminum material of the battery cell housing from at least 30%, preferably at least 60%, and particularly preferably 100% primary aluminum produced using CO2-neutral energy. By using primary aluminum produced using 100% CO2-neutral energy, CO2 emissions for the correspondingly produced primary aluminum are reduced from 8.6 to 4 kgCO2e / kgAl material compared to the average primary metal consumed in the EU, which corresponds to a reduction of more than 50%. According to a further embodiment, the aluminum material is produced from at least 40%, preferably at least 70%, external scrap and / or post-consumer scrap, whereby internal scrap can optionally also be used to produce the aluminum material. I / ZI 230145WOMarch 28, 2024 In addition to the production of the aluminum material, internal scrap has an additional 0.3 kgCO2e / kgAl material, which is higher than, for example, the production of the primary metal due to the production and further processing that has already taken place. Nevertheless, considering these metal sources contributes to increasing the efficiency of the production of prismatic battery cell casings, as material consumption is significantly reduced by remelting the internal scrap, and waste is avoided. External scrap and / or post-consumer scrap contribute significantly to reducing the CO2 emissions of the aluminum material, as they only generate 0.5 kgCO2e / kgAl material. Therefore, the highest possible proportion of this scrap is desirable. According to a further embodiment, a slug is first produced from the aluminum material, which is then extruded into a cup-shaped, prismatic battery cell casing blank.The prismatic battery cell housing, comprising a battery cell housing shell and a battery cell housing base, is finally formed from the cup-shaped battery cell housing blank via at least one further forming step, preferably by ironing, with aluminum alloys of the type AA1xxx, AA3xxx, or even AA6xxx being preferably used for the aluminum material. A battery cell housing cover can then be produced from a sheet metal blank, for example in the form of a stamped part, and the prismatic battery cell housing can be closed with this cover after its assembly.In an alternative process for producing the battery cell housing, an aluminum strip is first produced from the aluminum material by rolling, from which a prismatic battery cell housing comprising a battery cell housing shell and a battery cell housing base is produced by deep-drawing and ironing processes, for example directly from the aluminum strip or from sheet metal blanks from the aluminum strip, preferably using aluminum alloys of the type AA1xxx, AA3xxx, AA5xxx, or AA8xxx. The deep-drawing or ironing production steps are proven. I / ZI 230145WOMarch 28, 2024 industrial process steps that can be carried out in a highly automated manner with low energy consumption, i.e., without complex annealing processes. This makes this process also suitable for the particularly efficient production of prismatic battery cell housings. Starting from an aluminum strip, according to another alternative variant, an aluminum strip can first be produced from the aluminum material by rolling. A roll-forming process is used to form a roll-formed battery cell housing shell, which has a prismatic cross-section at least in some areas, from the aluminum strip, and the battery cell housing shell is joined longitudinally, preferably by form-fitting, frictional, and / or material-locking.The prismatic battery cell casing shell is then cut to length and joined to a battery cell casing base made from a sheet metal blank from an aluminum strip of the same or a different aluminum material using a form-fit, friction-fit, and / or material-fit joint, preferably using aluminum alloys of type AA1xxx, AA3xxx, AA5xxx, or AA8xxx. Roll forming, longitudinal seam joining, and cutting and joining of battery cell casing covers are also industrially proven processes that, using the aforementioned aluminum alloys, lead to advantageous properties of the battery cell casing. At the same time, these processes are also considered particularly energy-efficient, so that CO2 emissions continue to be dominated by the aluminum alloy manufacturing process.According to a further alternative embodiment, a tube with a prismatic cross-section is extruded from the aluminum material, which is optionally cut to length and, after at least one optional processing step to provide the final shaped battery cell housing shell, is joined in a form-fitting, friction-fitting and / or material-fitting manner to a battery cell housing base made from a sheet metal blank from an aluminum strip made from the same or a different aluminum material, wherein aluminum alloys of the type AA1xxx, AA3xxx, AA5xxx, AA6xxx or AA8xxx are preferably used. I / ZI 230145WOMarch 28, 2024. In order to provide a finished prismatic battery cell housing, according to a further embodiment, the cup-shaped battery cell housings manufactured using the previously described methods are sealed after cell assembly by arranging the electrodes and the active material in the cup-shaped battery cell housing with a battery cell housing cover made of a sheet metal blank made of an aluminum material. Here, too, form-fitting, frictional, and / or material-locking joining processes can preferably be used.Finally, the above-mentioned object is achieved by using an aluminum material for producing a prismatic battery cell housing, wherein the aluminum material has a ratio of the amount of greenhouse gases emitted during the production of the aluminum material, expressed as CO2 equivalents of carbon dioxide (CO2e) in kgCO2e per kgAl material, to the yield strength Rp0.2 of the aluminum material in MPa of CO2e / Rp0.2 ≤ 6.15% kgCO2e / (MPa*kgAl material), preferably CO2e / Rp0.2 ≤ 5% kgCO2e / (MPa*kgAl material), particularly preferably CO2e / Rp0.2 ≤ 4% kgCO2e / (MPa*kgAl material) or CO2e / Rp0.2 ≤ 2% kgCO2e / (MPa*kgAl material). The use of the The aluminum material according to the invention ensures a significant saving in greenhouse gas emissions compared to the current standard material of a primary aluminum-based aluminum alloy AA3003 in the H14 temper with 125 MPa.The invention will be explained in more detail below using exemplary embodiments in conjunction with the drawing. The drawing shows, in Fig. 1, a schematic representation of a battery cell with a prismatic B. atteriezellgehäuse, Z I / ZI 230145WOMarch 28, 2024 Fig. 2 shows a flow diagram of a method for producing a prismatic battery cell housing by impact extrusion according to a first embodiment. Fig. 3 shows a flow diagram of a method for producing a prismatic battery cell housing by deep drawing and ironing a blank of aluminum strip according to a second embodiment. Fig. 4 shows a flow diagram for producing a prismatic battery cell housing by roll forming and longitudinal seam joining according to a third embodiment. Fig. 5 shows a flow diagram for producing a prismatic battery cell housing by extruding a prismatic tube according to a fourth embodiment. First, Fig. 1 shows a schematic representation of a battery cell 10 with a prismatic battery cell housing 11. In addition to the battery cell housing 11, the battery cell 10 has an anode terminal 12 and a cathode terminal 13.As already explained above, the prismatic battery cell housing 11 has two battery cell housing covers 14 and 15 and a battery cell housing shell 16. A manufacturing method of an exemplary embodiment is schematically illustrated in Fig. 2. According to step A1, a slug is first produced from an aluminum material. A slug can be produced, for example, by sawing a rod with a corresponding diameter. Alternatively, slugs can be produced from a rolled or cast strip production process, whereby the slugs are punched from the rolled or cast strip and subsequently surface-treated and optionally annealed. The slug is then inserted into an extrusion tool and extruded into a prismatic battery cell housing blank by extrusion according to step B1. This blank is then formed in step C1Z. I / ZI 230145WOMarch 28, 2024, by at least one manufacturing step, for example, trimming or ironing, into the prismatic battery cell housing 11 with battery cell housing base 15 and battery cell housing shell 16 and is available for cell assembly. In step D1, the cell assembly takes place, in which the battery cell housing cover is joined to the battery cell housing shell 16 in a form-fitting, frictional, and / or material-fitting manner. The starting point for the embodiments shown in Fig. 3 and Fig. 4 is an aluminum strip, which is provided in step A2 and A3, respectively. The aluminum strip can be produced, for example, by the following steps: werden:- Casting of an aluminum alloy rolling ingot, - Optional homogenization of the rolling ingot, - Hot rolling of the rolling ingot into a hot-rolled strip, - Cold rolling of the hot-rolled strip with optional intermediate annealing. After cold rolling, the strips can be in the H12, H14, H16, H18, or H19 tempers. However, cold rolling can optionally be followed by heat treatment of the strip in the form of temper annealing, preferably in the form of reannealing. After reannealing, the yield strength Rp0.2 values ​​are barely reduced. However, the possible degrees of deformation are significantly improved, for example in the H24 temper. Alternatively, the aluminum strip can also be provided in step A2 or A3 by continuous casting, optionally using twin-roll casters or twin-belt casters, which enable large production capacities. After casting the cast strip, for example, cold rolling to the final thickness of the aluminum strip takes place. According to Fig.3 In step B2, a prismatic battery cell housing having aZ is produced from the rolled aluminum strip by deep drawing and ironing processes. I / ZI 230145WOMarch 28, 2024. A battery cell housing shell and a battery cell housing base are manufactured, preferably using aluminum alloys of the type AA1xxx, AA3xxx, AA5xxx, or AA8xxx. The deep-drawing and ironing processes preferably take place on blanks of the aluminum strip, but can also be carried out on the aluminum strip in progressive dies. In step C2, an optional further forming step is performed to achieve the final geometry of the prismatic battery cell housing 11, including the battery cell housing base 15 and the battery cell housing shell 16. In step D2, the cell assembly takes place, which includes, among other things, the positive, frictional, and / or material-locking joining of the battery cell housing cover 14 to the battery cell housing shell 16. According to Fig. 4, a roll-formed battery cell housing shell, which has a prismatic cross-section at least in some regions, is formed from the rolled aluminum strip using a roll-forming process in step B3.The battery cell housing shell is then joined longitudinally, preferably by form-fitting, frictional, and / or material-locking, and cut to length in step B3. The battery cell housing shell can optionally also be joined longitudinally after cutting. In step C3, a cut battery cell housing base made from a sheet metal blank from an aluminum strip of the same or a different aluminum material is joined to the battery cell housing shell 16 by form-fitting, frictional, and / or material-locking, preferably using aluminum alloys of type AA1xxx, AA3xxx, AA5xxx, or AA8xxx for the battery cell housing shell 16 or the battery cell housing covers 14 and 15. Cell assembly takes place in step D3, which includes, among other things, closing the battery cell housing shell 16 with two battery cell housing covers 14 by form-fitting, frictional, and / or material-locking joining.Other conceivable manufacturing processes include direct and indirect extrusion, as well as tube drawing processes and combinations of these processes, which allow the production of a tubular body that can serve as a battery cell casing. A flow diagram of such a process is shown in Fig. 5. I / ZI 230145WOOn March 28, 2024, a tube with a prismatic cross-section is extruded from the aluminum material in step A4, which is cut to length in the optional step B4 and, if necessary, processed into a final-shaped battery cell housing shell by at least one optional processing step. In step C4, the battery cell housing shell is joined to a battery cell housing base made from a sheet metal blank from an aluminum strip of the same or a different aluminum material using a form-fitting, friction-fitting, and / or material-fitting connection, preferably using aluminum alloys of the type AA1xxx, AA3xxx, AA6xxx, or AA8xxx. Subsequently, in step D4, the cell assembly and sealing of the battery cell with another battery cell housing cover can take place. The prismatic battery cell housings 11 that can be produced using the methods described above were tested with regard to their potential for reducing greenhouse gas emissions.The following assumptions were made. CO2 emissions are essentially dominated by the provision of aluminum alloys, particularly using primary aluminum. Sheet metal production typically generates only 0.4 kgCO2e / kgAl material. On average, the global emissions for primary aluminum production are 16 kgCO2e / kgAl material. Primary aluminum consumed in the European Union, in contrast, has an emissions rate of only 8.6 kgCO2e / kgAl material. In the following, it is assumed for the calculation that internal scrap made of primary metal with a CO2 equivalent of 8.6 kgCO2e / kgAl material is used and that an average emission of 0.3 kgCO2e / kgAl material is used for its processing, so that this scrap is assessed with an emissions rate of 8.9 kgCO2e / kgAl material. External scrap and post-consumer scrap are reported at 0.5 kgCO2e / kgAl material.If primary aluminum is produced using CO2-neutral energy sources alone, the emissions are still 4 kg CO2e / kg of aluminum material. (see International Aluminum Association: https: / / international-aluminium.org / statistics / greenhouse-gas-emissions-intensity-primary-aluminium / ) I / ZI 230145WOMarch 28, 2024. In Tables 1 and 2, the relationships shown in equation (23) have now been analyzed with reference to exemplary embodiments according to the invention and comparative examples. Table 1 contains exemplary embodiments according to the invention, while Table 2 contains comparative examples. In both tables, the first three columns indicate the alloy designation, the tempering state, and the yield strength tested. This is the minimum yield strength according to DIN EN 485-2 of the aluminum alloy in the respective tempering state. This is followed by five columns that indicate the proportions of the respective primary metal and / or internal and external scrap of the aluminum materials tested. The CO2 footprint of the aluminum material, including 0.4 kg CO2e / kg Al material for the production of the battery cell housing, is determined in the sixth column. From this value, the ratio to the yield strength is given in the seventh column.The greenhouse gas savings stated below are calculated according to equation (23) taking into account the battery format PHEV2+ used as an example, further taking into account the dimensions and wall thicknesses of the reference material AA3003 in temper H14 with a yield strength Rp0.2 of 125 MPa and current greenhouse gas emissions of 8.6 kgCO2e / kgAl material for the production of the primary aluminum up to the rolling ingot.It was shown that all investigated aluminum materials made from the aluminum alloys of type AA1xxx, AA3xxx, AA5xxx, and AA8xxx can provide a reduction in greenhouse gas emissions at a CO2e / Rp0.2 ratio of maximum 6.15% kgCO2e / (MPa*kgAl material) compared to the current reference material made from an aluminum alloy of type AA3003 in temper H14 with a yield strength Rp0.2 of 125 MPa made from primary aluminum with 8.6 kgCO2e / kgAl material, provided certain specifications are made for the yield strength Rp0.2 as well as for the origin of the primary aluminum and scrap content. The yield strength Rp0.2 for the reference material made from an AA3003Z was determined. I / ZI 230145WOMarch 28, 2024Aluminium alloy in temper H14, the minimum achievable value of 125 MPa according to DIN EN 485-2 is assumed. As already stated above, with a maximum of 6.15% kgCO2e / (MPa*kgAl material), a saving of at least 9% is achieved when using the battery cell format PHEV2+ for the prismatic battery cell housing with 148 mm length (l), 91 mm width (a) and 26.5 mm depth (b), an initial thickness of the standard material AA3003 in the H14 state of s30003Std = 0.5 mm and an initial thickness of the cover of s3003Sdt,D = 1.5 mm. The exemplary embodiments 1 to 12 according to the invention have a ratio CO2e / Rp0.2 of a maximum of 6.15% to more than 5% kgCO2e / (MPa*kgAl material), so that a saving in greenhouse gas emissions in kgCO2e / kgAl material taking into account a HVEP2+ geometry with at least 9%.It can be seen that when choosing an aluminum material with a lower yield strength Rp0.2, a saving in greenhouse gas emissions can only be achieved by changing the primary metal source to, for example, 100% primary metal produced using renewable energy. This is demonstrated by Example No. 1. However, an identical effect can also be achieved by adding external scrap, see Example No. 2. Examples 13 to 23 achieve even greater savings with a CO2e / Rp0.2 ratio of a maximum of 5% kgCO2e / (MPa*kgAl material) in greenhouse gas emissions. This saving is at least 20% for the aforementioned examples. With an unchanged primary metal source (EU mix), this can only be achieved with a significant increase in the yield strength Rp0.2, for example, to 185 MPa in Example No. 18.However, when changing the primary source, soft aluminum materials with Rp0.2 up to a maximum of 100 MPa can still achieve this saving, as in Example 25. An even higher saving of CO2 emissions is achieved in Example 24 to 36 with a ratio of CO. 2e / R p0,2 maximum 4% kg CO2e / (MPa*kgAl material) is achieved. This is at least 35%. It is clear that the savings withoutZ I / ZI 230145WO 28 March 2024Change of primary metal source or use of external scrap can only be realized by high-strength aluminum materials, as example 32 zeigt.With a CO2e / Rp0.2 ratio of a maximum of 2% kgCO2e / (MPa*kgAl material), examples 37 to 49 demonstrate the maximum savings in greenhouse gas emissions. These are at least 65% and, as the examples show, can essentially only be achieved by using high proportions of external scrap at lower or equal yield strengths Rp0.2 compared to the reference material AA3003 in temper H14, as shown, for example, in example 48. Due to the high CO2 footprint of internal scrap, these can only be used to achieve such high greenhouse gas emission savings in combination with higher-strength materials and in combination with higher proportions of external scrap. As the comparative examples in Table 2 show, high yield strength values ​​Rp0.2 or the use of proportions of primary metal produced with purely renewable energy sources cannot individually achieve greenhouse gas emission savings.The CO2e / Rp0.2 ratio of a maximum of 6.15% kgCO2e / (MPa*kgAl material) is therefore an important property of the aluminum material for providing prismatic battery cell housings with a reduced CO2 footprint. I / ZI 230145WO March 28, 2024 Table 1: Inventive embodiments AA- Tempering Rp0.2 Proportion of primary metal in [%] Proportion of internal Proportion of external CO2e CO2e / Rp0.2 No. Alloy state (MPa) made from scrap [%] scrap [%] [kgCO2e / [%] kgAl material] Renewable energy mix Energy mix Energy ^ EU ^ weltweit1050 H14 85 100 4.4 5.18 11050 H14 85 30 70 3.33 3.92 21050 H18 120 60 40 6.4 5.30 33003 H18 170 100 9.0 5.29 43005 H18 200 30 70 11.4 5.72 53105 H18 180 100 9.0 5.00 65005 H24 110 60 40 5.8 5.24 75005 H24 110 30 70 5.6 5.05 85052 H24 150 60 40 9.1 6.08 95182 O 110 60 40 5.8 5.24 108011 H14 110 60 40 6.4 5.78 118011 H14 110 60 40 5.8 5.24 128011 H24 100 60 40 5.8 5.76 131050 H19 130 60 40 5.8 4.43 143003 H14 125 60 40 5.8 4.61 153004 H18 230 60 40 10.2 4.43 16T I / ZI 230145WO March 28, 2024

[0002] AA- Temper Rp0.2 Proportion of primary metal in [%] Proportion of internal Proportion of external CO2e CO2e / Rp0.2 No. Alloy condition (MPa) made from scrap [%] scrap [%] [kgCO2e / [%] kgAl material] Renewable energy mix Energy mix Energy ^ EU ^ weltweit3005 H24 130 60 40 6.4 4.89 173005 H19 210 30 70 9.2 4.39 185005 H19 185 100 9.0 4.86 195754 H14 190 30 70 9.2 4.85 205182 O 110 100 4.4 4.00 215182 H19 320 60 40 13.6 4.24 225083 H32 215 100 9.0 4.19 238011 H16 130 60 40 5.8 4.43 241050 H14 85 60 40 3.0 3.53 251050 H14 85 30 70 2.0 2.29 263003 H18 170 60 40 6.4 3.74 273003 H18 170 30 70 5.6 3.26 283005 H19 210 30 70 7.8 3.73 293105 H24 120 30 70 3.3 2.78 305005 H18 165 60 40 6.4 3.85 315005 H18 165 60 40 5.8 3.49 325052 H18 240 100 9.0 3.75 33T I / ZI 230145WO March 28, 2024

[0003] AA- Temper Rp0.2 Proportion of primary metal in [%] Proportion of internal Proportion of external CO2e CO2e / Rp0.2 No. Alloy condition (MPa) made from scrap [%] scrap [%] [kgCO2e / [%] kgAl material] Renewable energy mix Energy mix Energy ^ EU ^ weltweit5754 H18 250 100 9.0 3.60 345182 O 110 30 70 3.3 3.03 355083 H14 280 100 9.0 3.21 368011 H24 100 30 70 3.3 3.33 371050 H19 130 30 70 2.0 1.50 383003 H19 180 60 40 3.0 1.67 393004 H14 180 60 40 3.0 1.67 403105 H18 180 60 40 3.0 1.67 413105 H18 180 30 70 3.3 1.85 425005 H18 165 60 40 3.0 1.82 435052 H14 180 30 70 2.0 1.08 445052 H18 240 100 4.4 1.83 455754 H14 190 30 70 3.3 1.75 465182 H19 320 30 70 2.0 0.61 475182 H19 320 60 40 5.8 1.80 488011 H14 110 30 70 2.0 1.77 495182 H19 320 60 40 6.36 1.99 50Z I / ZI 230145WO March 28, 2024

[0004] Table 2: Comparative examples AA- Temper Rp0,2 Proportion of primary metal in [%] Proportion of internal Proportion of external CO2e CO2e / Rp0,2 No. Alloy condition (MPa) made from scrap [%] scrap [%] [kgCO2e / [%] Renewable energy mix energy mix kgAl- Energy ^ EU ^ worldwide material] 3003 H14 125 100 9,0 7,20 1 3003 H14 125 60 40 10,2 8,16 2 1050 H14 85 100 9,0 10,59 3 3004 H14 180 100 16,4 9,11 4 3004 H14 180 60 40 13,6 7,53 5 3005 H24 130 100 9.0 6.92 6 3105 H14 130 100 9.0 6.92 7 5005 H24 110 30 70 7.8 7.12 8 5005 H24 110 100 9.0 8.18 9 5005 H18 165 30 70 11.4 6.93 10 5052 H24 150 30 70 11.4 7.62 11 5052 H24 150 60 40 10.2 6.80 12 5052 H18 240 100 16.4 6.83 13 5754 H24 160 60 40 10.2 6.38 14 5083 O 125 100 9.0 7.20 15 8011 H16 130 100 9.0 6.92 16 8011 H16 130 60 40 9.1 7.02 17 Z I / ZI 230145WO March 28, 2024

Claims

March 28, 2024 Patent claims 1. Prismatic battery cell housing (11), characterized in that the prismatic battery cell housing (11) comprises an aluminum material whose ratio of the amount of carbon dioxide (CO2e) emitted during the production of the aluminum material in kgCO2e per kgAl material to the yield strength Rp0.2 of the aluminum material in MPa is CO2e / Rp0.2 ≤ 6.15% kgCO2e / (MPa*kgAl material), preferably CO2e / Rp0.2 ≤ 5% kgCO2e / (MPa*kgAl material), particularly preferably CO2e / Rp0.2 ≤ 4% kgCO2e / (MPa*kgAl material) or CO2e / Rp0.2 ≤ 2% kgCO2e / (MPa*kgAl material), whereby the yield strength Rp0.2 is measured at room temperature according to DIN EN ISO 6892-1.2.Battery cell housing (11) according to claim 1, characterized in that the prismatic battery cell housing (11) has a length (l) of a maximum of 1200 mm, preferably a maximum of 600 mm, particularly preferably a maximum of 300 mm, a width (a) of a maximum of 500 mm, preferably a maximum of 300 mm, particularly preferably a maximum of 200 mm, and a depth (b) of a maximum of 90 mm, preferably a maximum of 60 mm, particularly preferably a maximum of 40 mm, and the battery cell housing optionally has a format HEV 1, HEV 2, PHEV 1 PHEV 2, BEV 1, BEV 2, BEV 3, BEV 4 according to DIN 91252 2016-11, PHEV 2+ or a sword format.

3. Battery cell housing (11) according to claim 1 or 2, characterized in that s. - 2 - the aluminum material is a wrought aluminum material.

4. Battery cell housing (11) according to one of claims 1 to 3, characterized in that the aluminum material is a naturally hard wrought aluminum material and optionally comprises an aluminum alloy of the type AA1xxx, AA3xxx, AA5xxx or AA8xxx, or is a heat-treatable wrought aluminum material and comprises an aluminum alloy of the type AA6xxx.

5. Battery cell housing according to one of claims 1 to 4, characterized in that the battery cell housing (11) comprises an aluminum alloy of the type AA1050, AA1100, AA1200, AA3003, AA3004, AA3104, AA3005, AA3105, AA5005, AA5052, AA5454, AA5754, AA5182, AA5083, AA5086, AA8006, AA8008, AA8010, AA8011, AA8111, AA8021, AA8026, AA8050 or AA8079.6.Battery cell housing according to one of claims 1 to 5, characterized in that the aluminum material of the battery cell housing (11) has a yield strength Rp0.2 of more than 100 MPa, preferably 150 MPa, particularly preferably more than 175 MPa.

7. Battery cell housing according to one of claims 1 to 6, characterized in that the aluminum material consists at least partially of a primary aluminum, during the production of which the emitted amount of CO2 per kg of aluminum material of the battery cell housing is a maximum of 6.7 kgCO2e / kgAl material, preferably a maximum of 5 kgCO2e / kgAl material, particularly preferably a maximum of 4 kgCO2e / kgAl material. I / ZI 230145WO March 28, 2024 - 3 -8. Battery cell housing according to one of claims 1 to 6, characterized in that during the production of the aluminum material of the battery cell housing (11), the emitted amount of CO2 per kg of aluminum material of the battery cell housing is a maximum of 4 kgCO2e / kgAl material, preferably a maximum of 3 kgCO2e / kgAl material, particularly preferably a maximum of 2 kgCO2e / kgAl material.

9. Method for producing a prismatic battery cell housing (11) according to one of claims 1 to 7, characterized in that the method comprises forming the aluminum material, preferably deep drawing, extrusion, or roll forming of the aluminum material.

10. Process according to claim 8, characterized in that the aluminum material is produced from at least 30%, preferably at least 60%, and particularly preferably 100% primary aluminum produced using CO2-neutral energy.11.Method according to claim 8 or 9, characterized in that the aluminum material is produced from primary-based aluminum and at least 40%, preferably at least 70%, external scrap and / or post-consumer scrap, wherein internal scrap is optionally also used to produce the aluminum material.

12. Method according to one of claims 8 to 10, characterized in that a slug is first produced from the aluminum material, which slug is formed into a cup-shaped, prismatic battery cell housing blank. I / ZI 230145WO March 28, 2024 - 4 - is extruded, and the prismatic battery cell housing comprising a battery cell housing shell (16) and a battery cell housing base (15) is finally formed from the cup-shaped battery cell housing blank via at least one further forming step, preferably by ironing, wherein preferably aluminum alloys of the type AA1xxx, AA3xxx, but also AA8xxx are used for the aluminum material.

13. Method according to one of claims 8 to 10, characterized in that an aluminum strip is produced from the aluminum material by rolling, from which a prismatic battery cell housing (11) comprising a battery cell housing shell (16) and a battery cell housing base (15) is produced by deep-drawing and ironing processes, wherein preferably aluminum alloys of the type AA1xxx, AA3xxx, AA5xxx, or AA8xxx are used, or alternatively, a roll-formed battery cell housing shell is produced from the aluminum strip via a roll-forming process.which has a prismatic cross-section at least in some regions, is formed, the battery cell housing shell is joined in the longitudinal direction, preferably by form-fitting, frictional and / or material-locking, the prismatic battery cell housing shell is cut to length and joined to a battery cell housing base made from a sheet metal blank from an aluminum strip made of the same or a different aluminum material by form-fitting, frictional and / or material-locking, preferably using aluminum alloys of the type AA1xxx, AA3xxx, AA5xxx or AA8xxx.

14. Method according to one of claims 8 to 10, characterized in that alternatively, a tube with a prismatic cross-section is extruded from the aluminum material for the battery cell housing shell (16), which is optionally cut to length and, after at least one optional processing step, to provide the final-shaped Z, I / ZI 230145WO March 28, 2024 - 5 - Battery cell housing shell (16) is joined to a battery cell housing base (15) made from a sheet metal blank from an aluminum strip made of the same or a different aluminum material in a form-fitting, friction-fitting, and / or material-fitting manner, preferably using aluminum alloys of the type AA1xxx, AA3xxx, AA6xxx, or AA8xxx.

15. Method according to claim 11, 12, 13, or 14, characterized in that the cup-shaped battery cell housings are closed with a battery cell housing cover (14) made from a sheet metal blank made of an aluminum material during cell assembly.16.Use of an aluminum material for producing a prismatic battery cell housing (11) according to one of claims 1 to 8, optionally using a method according to claim 9 to 15d, characterized in that the aluminum material has a ratio of the amount of carbon dioxide emitted during the production of the aluminum material (CO2e) in kgCO2e per kgAl material to the yield strength Rp0.2 of the aluminum material in MPa of CO2e / Rp0.2 ≤ 6.15% kgCO2e / (MPa*kgAl material), preferably CO2e / Rp0.2 ≤ 5% kgCO2e / (MPa*kgAl material), particularly preferably CO2e / Rp0.2 ≤ 4% kgCO2e / (MPa*kgAl material) or CO2e / Rp0.2 ≤ 2% kgCO2e / (MPa*kgAl material), whereby the yield strength Rp0.2 is measured according to DIN EN ISO 6892-1 at room temperature. I / ZI 230145WO March 28, 2024