Battery Cell

Abstract

The invention relates to a method for manufacturing a battery cell (1) with low impedance, comprising arranging a conductive first contact material (4) on a bottom surface (3) inside a cell housing (2). Inserting a foil roll (7) into the cell housing (2) with one axial end of the foil roll (7) in front, so that a first electrode foil (8) is in direct contact with the first contact material (4). Connecting the first contact material (4) to the first electrode foil (8) in a material-joined manner, thereby electrically connecting the first electrode foil (8) to the cell housing (2).

Description

Technical Field

[0001] The invention relates to a method for manufacturing a battery cell and a corresponding battery cell. Background Art

[0002] Battery cells, in particular cells of lithium-ion rechargeable batteries, usually have several foil rolls in which the foils of the electrodes of two corresponding cells are wound in such a way that they are separated from each other by separators and are located in a cell housing. In order to electrically connect the electrode foils to the corresponding parts of the cell housing, current collector bars (English "Taps") are used in known battery cells, which are welded or melted to the electrode foils and also to the corresponding housing parts. In this case, the current collector bars are led out of the wound foil rolls at the end sides in order to be connected to the cell housing.

[0003] In a foil roll, the heat dissipation in the radial direction is usually small, so the collector bar also plays an important role in battery thermal management.

[0004] However, a disadvantage of such known battery cells is that the connection points between the housing and the collector bars, and between the collector bars and the corresponding electrode foils, depending on the type of design, increase the overall impedance of the battery cell. However, in particular for high-power battery cells, it is important to keep the overall impedance as low as possible. Even a slight increase in the overall impedance, for example due to the above-mentioned effects, can have negative effects. Summary of the invention

[0005] Therefore, the object of the present invention is to provide an improved solution for a battery cell, thereby reducing the overall impedance of the battery cell, in particular without causing deterioration of heat dissipation.

[0006] The solution of the invention for achieving the above-mentioned objects is the subject of the independent claim. Further embodiments are the subject of the dependent claims.

[0007] The development is based on the idea of ​​connecting the foil roll electrically and materially at one axial end directly to a corresponding contact surface located within the cell housing via an electrically conductive contact material.

[0008] According to the improved solution, a manufacturing method for manufacturing a battery cell is provided. To this end, a conductive first contact material is arranged on the bottom surface of the cell shell inside the cell shell. Subsequently, the foil roll is inserted into the cell shell in a manner that the first axial end of the foil roll is in front, so that the first electrode foil of the foil roll is in direct contact with the first contact material at the first axial end. Subsequently, the first contact material is connected to the first electrode foil in a material-bonded manner, thereby electrically connecting the first electrode foil to the cell shell, in particular to the bottom surface.

[0009] The single shell may have a cylindrical main body, which has a cylindrical outer cover and a bottom. The bottom corresponds to the bottom of the column, and the side of the bottom located inside the single shell corresponds to the bottom surface.

[0010] At the end of the cylindrical housing opposite to the bottom, the body is open, for example, for the insertion of a foil roll. For example, a cover assembly of a cylindrical housing can be used to close the single housing or body at this end.

[0011] The foil roll is in particular also cylindrical or approximately cylindrical, in particular round-cylindrical.

[0012] In particular, after the material-bonded connection with the first end of the foil roll has been established, the first contact material has, for example, electrical and thermal conductivity. However, the first contact material may also contain a component that is not electrically conductive, such as a polymer or another plastic.

[0013] “The first electrode foil is in direct contact with the first contact material” can be understood in particular as: no other contacting components are provided between the first contact material and the first electrode foil. In particular, the electrical contact between the electrode foil and the bottom surface is achieved only through the first contact material.

[0014] The first electrode foil has, in particular, a first carrier foil which is coated at least in places, in particular on both sides, with a first active material.

[0015] After the foil roll is inserted into the cell housing, in particular the first carrier foil, i.e. the area of ​​the carrier foil not coated with the first active material, is in direct contact with the first contact material. In particular, the first contact material is connected to the area of ​​the first carrier foil without the first active material in a material-bonded manner, thereby electrically connecting the first carrier foil to the cell housing.

[0016] Here and hereinafter, the term "axial" may refer, for example, to the winding axis of the foil roll and / or to the axis of symmetry of the cylindrical jacket of the cell housing, wherein in the manufactured state of the battery cell these two axes are, for example, approximately parallel to one another or approximately identical.

[0017] By means of the material-bonded connection of the first contact material to the first electrode foil, in particular the bottom side, ie the cell housing, is also connected to the first contact material in a material-bonded manner.

[0018] When using the manufacturing method according to the improved solution, no other components are required to electrically connect the foil roll to the cell housing at the first axial end except the foil roll itself and the first contact material. In addition, when the electrical connection is made through the first contact material, efficient heat dissipation can be ensured by means of the corresponding thermal conductivity of the first contact material.

[0019] In particular, current collector bars, also referred to below as “strips”, which need to be fastened both to the first electrode foil and to the cell housing and thus lead to a higher overall impedance, are not required.

[0020] Therefore, the overall impedance of the battery cell manufactured by the manufacturing method according to the improved scheme is reduced without impairing the heat dissipation capability.

[0021] Due to the improved solution, after the foil roll has been inserted into the monolithic housing, there is no need to pass a welding tool or the like through the foil roll or past the foil roll to weld the first axial end to the bottom surface or to connect it to the bottom surface via a corresponding strip or other contact component.

[0022] According to at least one embodiment of the manufacturing method, the first contact material in liquid or paste form is fed into the cell housing, that is, the first contact material can be fed onto the bottom surface by means of a syringe or a nozzle.

[0023] According to at least one embodiment, the first contact material is introduced into the cell housing as a solid sheet, for example as a solder sheet, ie as a sheet consisting of solder (also referred to as a soldering template).

[0024] Regardless of whether the contact material is introduced as a paste or liquid or the first contact material is introduced as a sheet, the first contact material can then be connected to the foil roll or to the first electrode foil in a material-bonded manner by external means, for example by external heating.

[0025] The first carrier foil can be designed in particular as a metal foil, for example a copper foil or an aluminum foil.

[0026] According to at least one embodiment, in particular for producing a foil roll before inserting the foil roll into a single housing, a first electrode foil and a second electrode foil of the foil roll are arranged overlappingly, so that the first electrode foil protrudes beyond the second electrode foil on a side corresponding to a first axial end of the foil roll. In this case, the overlapping electrode foils are wound together to produce the foil roll.

[0027] Alternatively, the electrode foils may be arranged overlappingly such that the second electrode foil protrudes beyond the first electrode foil on a side of a second axial end of the corresponding foil roll opposite to the first axial end.

[0028] In the overlapping arrangement of electrode foils, a separator is provided between the first and second electrode foils, for example, a further separator is provided on the side of the first electrode foil facing away from the separator or the second electrode foil, or on the side of the second electrode foil facing away from the separator or the first electrode foil.

[0029] The overlappingly arranged electrode foils, in particular electrode foils and separators, are wound up, for example by being wound onto a winding mandrel.

[0030] Therefore, in such embodiments, the second electrode foil is arranged in the wound foil roll at a certain distance from the first axial end of the foil roll, so that in particular after connecting the first contact material to the first electrode foil, the second electrode foil is not in electrical contact with the first contact material.

[0031] Correspondingly, the first electrode foil can also be spaced a certain distance from the second axial end of the foil roll. That is, the foil roll can also be connected to the cell housing directly via the second electrode foil and optionally to the second conductive contact material.

[0032] By means of such an arrangement of the electrode foil in the foil roll, in particular no strips are required for contacting the foil roll, and thus the impedance can be reduced.

[0033] According to at least one embodiment of the manufacturing method, the foil roll is provided such that the first electrode foil protrudes beyond the second electrode foil at a first axial end of the foil roll. Alternatively, the foil roll can be provided such that the second electrode foil protrudes beyond the first electrode foil at a second axial end of the foil roll.

[0034] In other words, in such embodiments, the step of producing a foil roll does not necessarily have to be a component of the production method according to the improved solution.

[0035] According to at least one embodiment, the first carrier foil is free of the first active material in a region in which the first carrier foil projects beyond the second electrode foil.

[0036] According to at least one embodiment, the second carrier foil is free of the second active material in the region in which the second carrier foil projects beyond the first carrier foil.

[0037] This makes it possible to improve the connection of the electrode foil to the cell housing, ie in particular to make the connection more reliable and stable.

[0038] According to at least one embodiment, after the foil roll has been inserted into the cell housing, the first contact material is heated from outside the cell housing, so that the first contact material is connected to the first electrode foil in a material-bonded manner.

[0039] “Heating from outside the cell housing” can be understood in particular to mean that in order to heat the first contact material, it is not necessary to insert a tool or a heat source into the interior of the cell housing. Instead, the heating device or the heating tool is arranged outside the housing, for example, near the bottom of the cell housing, so that the first contact material is heated from outside the cell housing, in particular indirectly.

[0040] The heating device or heating means can, for example, comprise a device for inductively heating the first contact material and / or the cell housing, or comprise a heating plate on which the cell housing is arranged, for example with the base placed on it.

[0041] This makes the battery cell particularly easy to manufacture. In particular, since no tool has to be inserted into the housing, there is no risk of mechanical damage to the foil roll.

[0042] The heating device or heating means may also comprise means for generating hot air for heating the first contact material.

[0043] The heating device or heating means may comprise means for generating infrared radiation for heating the first contact material.

[0044] The heating device may also comprise a liquid bath for heating the first contact material.

[0045] According to at least one embodiment, the first electrode foil or the cell housing is connected to the first contact material in a materially bonded manner by means of ultrasound.

[0046] In this case, for example, the heating can be assisted by ultrasound or the heating can be replaced by a connection by means of ultrasound.

[0047] According to at least one embodiment, in particular an embodiment in which the first contact material is heated so as to be bonded to the first electrode foil material, the first contact material or the first electrode foil or the foil roll is cooled, in particular actively cooled, from outside the cell housing, for example by means of an external cooling device.

[0048] The cooling prevents excessive heating and possible damage to the active material and / or the separators of the foil roll.

[0049] For example, heating can be terminated after a given heating time. Cooling can be performed at the end of the heating time, or after the heating time has ended, particularly immediately after the heating time has ended.

[0050] According to at least one embodiment, the first contact material comprises a metal component.

[0051] According to at least one embodiment, the metal component is melted or sintered by heating the first contact material.

[0052] If, for example, the solid first contact material is introduced into the cell housing, the first contact material can be melted by heating. If the first contact material subsequently solidifies again, it is bonded to the first electrode foil material.

[0053] If a pasty or liquid first contact material is introduced into the cell housing, a foil roll, in particular a first electrode foil, can be inserted into the first contact material, and by heating, for example, metal particles of the metal component can be melted or sintered, and / or the first contact material can be degreased or freed of solvent.

[0054] If the first contact material is a solid solder, ie in particular a soldering lug or a solid soldering template, the first contact material can be welded to the first electrode foil or to the cell housing by heating.

[0055] If the first contact material is a solder paste, a reflow soldering process (English: “reflow soldering”) may be performed by heating.

[0056] According to at least one embodiment, the first contact material comprises a polymer component.

[0057] According to at least one embodiment, the polymer component is melted by heating the first contact material from outside the cell housing.

[0058] The first contact material may, for example, comprise the polymer component (which may also be referred to as a polymer matrix or polymer carrier matrix), a conductive powder or conductive particles, or these particles may be embedded in a polymer material. The conductive particles may, for example, comprise metal or particles made of a carbon material, such as graphite, graphene or carbon nanotubes. As an alternative or in addition, the polymer component may be doped to achieve electrical conductivity.

[0059] By heating and melting the polymer component, the first electrode foil can be connected to the first contact material in a materially bonded manner.

[0060] For example, when the conductive particles are metal particles, they can also be melted, partially melted or sintered by heating.

[0061] According to at least one embodiment, the polymerization of the polymer components is initiated by heating.

[0062] According to at least one embodiment, the first contact material is designed as an adhesive, in particular an electrically conductive adhesive.

[0063] According to at least one embodiment, the adhesive is cured, in particular hardened or chemically cured, by heating.

[0064] According to the improved scheme, another manufacturing method for a battery cell is also provided. According to the another manufacturing method, a conductive second contact material is arranged on the inner cover surface of a cover assembly of a cell housing for closing the cell housing. Subsequently, the second electrode foil of the foil roll is directly contacted with the second contact material at the second axial end of the foil roll (which is particularly opposite to the first axial end of the foil roll). Subsequently, the second contact material is connected to the second electrode foil in a material-bonded manner, thereby electrically connecting the second electrode foil to the cover assembly.

[0065] After the main body of the monolithic housing is closed by the cover assembly of the monolithic housing, the inner cover surface of the cover assembly is located in particular inside the monolithic housing.

[0066] According to at least one embodiment of the further production method, the second contact material is heated from outside the cover component, so that the second contact material is bonded to the second electrode foil.

[0067] All embodiments of the other manufacturing method according to the improved solution can be combined with all embodiments of the manufacturing method according to the improved solution.

[0068] In particular, the above-mentioned method steps of the further production method can be carried out before carrying out the method steps of the production method according to the refinement.

[0069] All embodiments described for the manufacturing method according to the improved solution can be similarly applied to the other manufacturing method, wherein the roles of the first electrode foil and the second electrode foil, the first and second axial ends of the foil roll, the first and second contact materials, and the bottom surface and the top surface are interchanged.

[0070] In other words, the second electrode foil can be connected to the top surface by means of the second contact material, just as described above with respect to the connection of the first electrode foil to the bottom surface by means of the first contact material.

[0071] In at least one embodiment of a further production method according to the refinement, the foil roll is inserted into the cell housing with the first axial end of the foil roll leading, in particular after the second electrode foil has been connected to the second contact material in a material-bonded manner.

[0072] This method step of the further production method may also correspond to the corresponding method step of the production method described above.

[0073] According to at least one embodiment, after the foil roll has been inserted, the cell housing is connected to the cover assembly, thereby closing the cell housing.

[0074] For example, an insulating element may be provided between the main body and the cover assembly, so as to electrically insulate the main body and the cover assembly from each other.

[0075] According to the improved scheme, a battery cell is also provided, which is manufactured in particular by a manufacturing method and / or another manufacturing method according to the improved scheme. The battery cell has a cell housing, a conductive first contact material arranged on the bottom surface of the cell housing inside the cell housing, and / or a conductive second contact material arranged on the cover surface of the cell housing inside the cell housing. The battery cell has a battery cell comprising a first and a second electrode foil. The first electrode foil is directly connected to the first contact material in a material-bonded manner at the first axial end of the foil roll, and the first contact material electrically connects the first electrode foil in particular directly to the cell housing, in particular the bottom surface, and / or the second electrode foil is directly connected to the second contact material in a material-bonded manner at the second axial end of the foil roll opposite to the first axial end, and the second contact material electrically connects the second electrode foil in particular directly to the cell housing, in particular the cover component, in particular the cover surface.

[0076] The advantages described with regard to the production method apply to the battery cell according to the development.

[0077] According to at least one embodiment of the battery cell, the first contact material is present in the form of a previously liquid or pasty material that solidifies or hardens.

[0078] According to at least one embodiment, the first contact material is in the form of a solder, which is in the form of a solid solder sheet before being used for soldering to connect with the first electrode foil.

[0079] According to at least one embodiment, the single housing has a cover component, for example, a cup-shaped or columnar cover component, which is, for example, sleeved onto a main body of the single housing.

[0080] According to at least one embodiment of the battery cell, an insulating element, such as an insulating ring, is provided between the main body and the cover assembly to achieve electrical insulation between the cover assembly and the main body.

[0081] According to at least one embodiment, the battery cells are designed as lithium-ion battery cells, in particular as lithium-ion rechargeable batteries.

[0082] According to at least one embodiment, the battery cell is shown without current collector bars, ie without strips (English: “tapless design”).

[0083] In accordance with at least one embodiment of the battery cell, the first electrode foil projects beyond the second electrode foil in a given first axial end region of the foil roll or of the first electrode foil.

[0084] In accordance with at least one embodiment of the battery cell, the second electrode foil projects beyond the first electrode foil in a given second axial end region of the foil roll or of the second electrode foil.

[0085] In accordance with at least one embodiment, the first electrode foil comprises a first electrically conductive carrier foil and a first active material, which is arranged as a layer on both sides of the first carrier foil.

[0086] In accordance with at least one embodiment, the second electrode foil comprises a second electrically conductive carrier foil and a second active material, which is arranged as a layer on both sides of the second carrier foil.

[0087] In this case, the layer composed of the active material does not necessarily have to be continuous.

[0088] The carrier foils can contain, for example, a metal or a metal alloy. For example, one of the carrier foils, in particular the first carrier foil, contains aluminum or an aluminum alloy or consists of aluminum or an aluminum alloy. For example, one of the carrier foils, in particular the second electrode foil, contains copper or a copper alloy or consists of copper or a copper alloy.

[0089] According to at least one embodiment, the first carrier foil is free of first active material in a first axial end region and / or the second carrier foil is free of second active material in a second axial end region.

[0090] In other words, the active material extends on the opposite surface of the respective carrier foil in a corresponding region which does not include the first or second axial end region.

[0091] In other words, the first carrier foil is exposed in the first axial end region and / or the second carrier foil is exposed in the second axial end region. In other words, the first carrier foil is in direct contact with the first contact material and / or the second carrier foil is in direct contact with the second contact material.

[0092] According to at least one embodiment, a separator is arranged between the first electrode foil and the second electrode foil, in particular in the region where the first or second active material is provided.

[0093] According to at least one embodiment, in the unrolled state of the foil roll, the separator is arranged between the electrode foils.

[0094] According to at least one embodiment, the foil roll has a further separator between the electrode foils.

[0095] In the unrolled state of the foil roll, the further separator is arranged, for example, on the side of the first electrode foil facing away from the separator or on the side of the second electrode foil facing away from the separator.

[0096] According to at least one embodiment, the first contact material includes a first carrier material and electrically conductive first particles embedded in the first carrier material.

[0097] According to at least one embodiment, the second contact material comprises a second carrier material and electrically conductive second particles embedded in the second carrier material.

[0098] The support material may also be referred to as matrix material.

[0099] The carrier material may, for example, comprise a polymer material.

[0100] The electrically conductive particles may also be understood to mean granules, powder or dust, as the case may be, in a molten or partial state.

[0101] According to at least one embodiment, the first and / or second particles contain a metal or consist of a metal.

[0102] Depending on the electrochemical system used in the battery cell, ie, in particular which active materials are used, different metals can be used which do not or do not significantly interact electrochemically with the charging and discharging operations in the battery cell. For example, noble metals can be used.

[0103] According to at least one embodiment, the first and / or second particles contain a carbon material, or consist of a conductive carbon material.

[0104] The advantage of this is that the carbon material can be used in combination with different active materials.

[0105] The conductive carbon material includes, for example, graphite, graphene and / or carbon nanotubes.

[0106] According to at least one embodiment, the first contact material and / or the second contact material contains solder.

[0107] The solder may be designed, for example, as a solder paste, a solder sheet or a solder template, in particular as a noble metal solder.

[0108] According to at least one embodiment, the first contact material and / or the second contact material is present in the battery cell in the form of a melted and resolidified material or in the form of a sintered metal.

[0109] According to at least one embodiment, the first contact material and / or the second contact material contains a binder.

[0110] Further embodiments of the battery cell according to the refinement are derived directly from different embodiments of the production method according to this refinement and a further production method, and vice versa. BRIEF DESCRIPTION OF THE DRAWINGS

[0111] in:

[0112] Figure 1 Schematically shows the structure of a foil roll for a battery cell;

[0113] Figure 2 is a schematic cross-sectional view of an exemplary embodiment of a battery cell according to the improved solution;

[0114] Figure 3 shows the arrangement of electrode foils and separators in a foil roll for use in another exemplary embodiment of a battery cell according to the improved solution; and

[0115] Figure 4 1 is a flow chart of an exemplary embodiment of a manufacturing method according to the improved scheme and an exemplary embodiment of another manufacturing method. DETAILED DESCRIPTION

[0116] Figure 1 The structure of a battery roll of a lithium-ion battery cell is schematically shown.

[0117] The foil roll FW comprises four components S1 , S2 , EF1 , EF2 which are arranged one above the other and which are wound, for example, by means of a cylindrical winding mandrel.

[0118] In the unrolled state, the separator S1 , the first electrode foil EF1 , the second separator S2 , and the second electrode foil EF2 are arranged overlapping in the order mentioned, for example, and are then rolled up.

[0119] Figure 2 is a schematic cross-sectional view of an exemplary embodiment of a battery cell according to the improved solution.

[0120] The battery cell 1 has a cell housing 2, which includes a cylindrical body 2a and a cover assembly 2b. The body 2a is closed at one axial end of the cylindrical outer cover by a bottom surface 3. On the opposite end, the body 2a itself is open and is closed by a cover assembly 2b.

[0121] The bottom surface 3 and the cover surface 5 of the cover assembly 2b are both conductive. Therefore, the battery cell 1 has, for example, an insulating ring 13 disposed between the cover assembly 2b and the main body 2a for electrically insulating the cover assembly 2b and the main body 2a from each other.

[0122] The battery cell 1 also has a foil roll 7. At a first axial end of the foil roll 7, the foil roll 7 is connected in a materially bonded manner to the first contact material 4 and thereby electrically connected to the body 2a on the bottom side 3.

[0123] Optionally, the foil roll 7 can be materially connected to the cover component 2b on the cover surface via a second conductive contact material 6 at a second axial end of the foil roll 7 opposite to the first axial end, in particular to electrically connect the foil roll 7 to the cover component 2b.

[0124] The foil roll 7 particularly comprises a first electrode foil 8 and a second electrode foil 9. The first contact material 4 is in direct contact with the first electrode foil 8 and is not electrically connected to the second electrode foil 9. Accordingly, the second contact material 6 is not electrically connected to the first electrode foil and is in direct contact with the second electrode foil.

[0125] exist Figure 3 The structure of the foil roll 7 is shown in a more accurate (but not necessarily proportional) manner. Figure 3 This is understood to be a sectional view of the foil roll 7 in the unrolled state.

[0126] The first electrode foil 8 comprises a first carrier foil 8a, such as an aluminum foil, and a first active material 8b arranged on both sides of the first carrier foil 8a. The first carrier foil 8a does not have the first active material 8b in the first axial end region 10 of the foil roll 7, so the first contact material 4 is in direct electrical contact with the first carrier foil 8a at the first axial end region 10 and is connected to the carrier foil material in a bonding manner.

[0127] The second electrode foil 9 comprises a second carrier foil 9a, such as a copper foil, and comprises a first active material 9b arranged on both sides of the second carrier foil 9a. The first carrier foil 8a does not have the second active material 9b in the second axial end region 11 of the foil roll 7, so the second contact material 6 is in direct electrical contact with the second carrier foil 9a at the second axial end region 11 and is connected to the carrier foil material in a bonding manner.

[0128] The first and second electrode foils 8 , 9 are arranged axially staggered with each other, so that the first electrode foil 8 extends beyond the second electrode foil 9 in the first axial end region 10 , and the second electrode foil 9 extends beyond the first electrode foil 8 in the second axial end region 11 .

[0129] In the region where the first and second electrode foils 8 , 9 overlap one another, the respective surfaces of the first and second carrier foils 8 a , 8 b are coated, for example continuously, with the respective active material 8 b , 9 b .

[0130] The foil roll 7 has a separator 12a, which is arranged between the first electrode foil 8 and the second electrode foil 9. The separator 12a is arranged between the electrode foils 8, 9 in particular in such a way that the corresponding parts of the active materials 8b, 9b facing each other do not directly contact each other. A further separator 12b of the foil roll 7 is arranged on the side of the first electrode foil 8 facing away from the separator 12a or on the side of the second electrode foil 9 facing away from the separator 12a. Figure 2 As shown, in the unfolded state, the further separator 12 b is also located between the electrode foils 8 , 9 .

[0131] The battery cell 1 can be produced, for example, by means of a production method according to the described refinement or by means of another production method.

[0132] Figure 4 Such a manufacturing method is shown in a flow chart.

[0133] In step S1, a cover component 2b is provided, and in step S2, a second conductive contact material 6 is introduced into the cover component 2b, in particular onto the cover surface 5. For example, the second contact material 6 in the form of a metal paste, a solder paste, or a plastic material containing a polymer matrix and conductive metal particles or carbon particles embedded therein can be introduced into the cover component 2b. As an alternative, the second contact material 6 in the form of a solder sheet or other soldering template can also be introduced.

[0134] In step S3, the foil roll 7 is brought into contact with the second contact material 6 with the second axial end region 11 in front. Depending on the configuration of the second contact material 6, in particular, whether the second contact material 6 is solid, liquid or paste-like, the foil roll 7 can partially enter the second contact material 6 as appropriate.

[0135] In step S4, the second contact material 6 is heated from outside the cover component 2b, for example inductively or by means of a heating plate. Optionally, the first contact material or foil roll 7 is actively cooled after heating to avoid overheating the active materials 8b, 9b.

[0136] In step S5, the body 2a is provided, and in step S6, the first contact material 4 is introduced into the body 2a, in particular onto the bottom surface 3. With regard to the material for the contact material 4, what has been explained above with respect to the second contact material 6 also applies analogously.

[0137] In step S7, the foil roll 7 is inserted into the body 2a with the first axial end region 10 in front and connected to the first contact material 4, which is connected to the cover component 2b as described above, for example, via the second contact material 6. Similar to the above, in step S8, the first contact material 4 is heated from the outside of the cell housing 2, so that the first contact material 4 is connected to the first electrode foil 8 in a material-bonded manner.

[0138] The method may also comprise only steps S5 to S8 , in which the foil roll 7 is connected to the cover component 2 b or another component of the cell housing 2 in an alternative manner beforehand or afterwards.

[0139] It is also possible to carry out steps S1 to S4 without necessarily carrying out steps S5 to S8 afterwards. In this case, the foil roll 7 is connected to the body 2a in an alternative manner in particular.

[0140] In other words, the method includes a material-bonding connection of the foil roll 7 to the first contact material 4 and / or a material-bonding connection of the foil roll 7 to the second contact material 6 .

[0141] As described above, by means of the improved solution, a battery cell with a reduced overall impedance is produced while at the same time ensuring good heat dissipation from the foil roll.

[0142] Reference numerals list

[0143] 1 Battery Cell

[0144] 2 Monocoque

[0145] 2a Main body

[0146] 2b Cover assembly

[0147] 3 bottom

[0148] 4 Contact materials

[0149] 5 Cover

[0150] 6 Contact materials

[0151] 7 Foil Rolls

[0152] 8 Electrode foil

[0153] 8a Carrier foil

[0154] 8b Active Materials

[0155] 9 Electrode foil

[0156] 9a Carrier foil

[0157] 9b Active Materials

[0158] 10, 11 Axial end region

[0159] 12a, 12b Divider

[0160] 13 Insulation ring

[0161] S1 to S8 Method steps

Claims

1. A method for manufacturing a battery cell (1), wherein In a first step, a first electrically conductive contact material (4) is arranged inside the cell housing (2) on the bottom surface (3) of the cell housing (2); - in a second step after the first step, inserting the foil roll (7) into the cell housing (2) with the first axial end of the foil roll (7) in front, so that the first electrode foil (8) of the foil roll (7) is in direct contact with the first contact material (4) at the first axial end; as well as - in a third step after the second step, the first contact material (4) is connected to the first electrode foil (8) in a material-joined manner, thereby electrically connecting the first electrode foil (8) to the cell housing (2); in, - in a given first axial end region (10) at the first axial end, the first electrode foil (8) axially extends beyond the second electrode foil (9); and / or, in a given second axial end region (11) at the second axial end, the second electrode foil (9) axially extends beyond the first electrode foil (8); The first electrode foil (8) has a first carrier foil (8a), and a first active material (8b) which is arranged as a layer on both sides of the first carrier foil (8a); and The second electrode foil (9) has a second carrier foil (9a), and a second active material (9b) which is arranged as a layer on both sides of the second carrier foil (9a); - the first carrier foil (8a) is free of the first active material (8b) in the first axial end region (10); and / or - the second carrier foil (9a) is free of the second active material (9b) in the second axial end region (11); The first contact material (4) is heated from outside the monomer housing (2) so as to connect the first contact material (4) to the first electrode foil (8) in a material bonding manner; and the first contact material is actively cooled from outside the monomer housing.

2. The manufacturing method according to claim 1, - arranging the first electrode foil (8) and the second electrode foil (9) of the foil roll (7) to overlap each other so that the first electrode foil (8) protrudes beyond the second electrode foil (9) on a side corresponding to a first axial end of the foil roll (7); and - The overlappingly arranged electrode foils (8, 9) are wound together to produce a foil roll (7).

3. The method according to claim 1, wherein the metal component of the first contact material (4) is melted by heating.

4. The method according to claim 1, wherein the polymer component of the first contact material (4) is melted by heating.

5. The method according to claim 1, wherein the first contact material (4) is in the form of an adhesive and wherein the first contact material is cured by heating.

6. A method for manufacturing a battery cell, wherein - in a first step, a second electrically conductive contact material (6) is arranged on an inner cover surface (5) of a cover component (2b) for closing the cell housing (2); - in a second step after the first step, bringing the second electrode foil (9) of the foil roll (7) into direct contact with the second contact material (6) at a second axial end of the foil roll (7); and - in a third step after the second step, the second contact material (6) is connected to the second electrode foil (9) in a material-joined manner, thereby electrically connecting the second electrode foil (9) to the cover component (2b); in, - in a given first axial end region (10) at the first axial end, the first electrode foil (8) axially extends beyond the second electrode foil (9); and / or, in a given second axial end region (11) at the second axial end, the second electrode foil (9) axially extends beyond the first electrode foil (8); The first electrode foil (8) has a first carrier foil (8a), and a first active material (8b) which is arranged as a layer on both sides of the first carrier foil (8a); as well as The second electrode foil (9) has a second carrier foil (9a), and a second active material (9b) which is arranged as a layer on both sides of the second carrier foil (9a); - the first carrier foil (8a) is free of the first active material (8b) in the first axial end region (10); and / or - the second carrier foil (9a) is free of the second active material (9b) in the second axial end region (11); The second contact material (6) is heated from outside the cell housing (2) so as to connect the second contact material (6) to the second electrode foil (9) in a material-bonded manner; and the second contact material is actively cooled from outside the cell housing.

7. The manufacturing method according to claim 6, wherein The foil roll (7) is inserted into the monolithic housing (2) in such a way that the first axial end of the foil roll (7) opposite to the second axial end is in front.

8. A battery cell manufactured by the method according to any one of claims 1 to 5 and / or the method according to any one of claims 6 or 7, the battery cell having - a cell housing (2), a first conductive contact material (4) arranged on a bottom surface (3) of the cell housing (2) inside the cell housing (2), and / or a second conductive contact material (6) arranged on a cover surface (5) of the cell housing (2) inside the cell housing (2); - a foil roll (7), comprising a first electrode foil (8) and a second electrode foil (9), - wherein the first electrode foil (8) is directly connected to the first contact material (4) at the first axial end of the foil roll (7) in a material-jointed manner, and the first contact material (4) electrically connects the first electrode foil (8) to the cell housing (2); and / or - wherein the second electrode foil (9) is directly connected to the second contact material (6) in a material-bonded manner at the second axial end of the foil roll (7), and the second contact material (6) electrically connects the second electrode foil (9) to the cell housing (2).

9. The battery cell according to claim 8, wherein - the first contact material (4) comprises a first carrier material and electrically conductive first particles embedded in the first carrier material; and / or The second contact material (6) comprises a second carrier material and electrically conductive second particles embedded in the second carrier material. 10 . The battery cell according to claim 9 , wherein the first and / or second particles comprise metal and / or carbon materials.

11. The battery cell according to claim 8, wherein the first contact material (4) and / or the second contact material (6) comprises solder.

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