Battery cell

Abstract

To provide a battery cell in which a cell housing is subjected to less mechanical stress when the thickness of an electrode assembly changes.SOLUTION: The present invention relates to a battery cell including: a cell housing; and at least one electrode assembly (5). The cell housing includes: a housing base (7); and a housing cover (13). The housing base (7) defines, together with the housing cover (13), an electrode receiving chamber (19) in which the electrode assembly (5) is arranged. The housing cover (13) is movably connected to the housing base (7) via a preferably flexible and / or elastic and / or permanently elastic sealing element (17).SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The invention relates to a battery cell according to the preamble of claim 1 and to a battery cell according to claim 7 . [Background technology]

[0002] A typical battery cell comprises a completely rigid cell housing having a housing base and a housing cover rigidly connected to the housing base. The housing base and the housing cover define an electrode-receiving chamber in which an electrode stack is disposed. The electrode stack changes thickness depending on the state of charge of the battery cell. The rigid cell housing is subjected to repeated mechanical stresses, i.e., with each charging cycle, due to the thickness change. The rigid cell housing can only withstand this mechanical load for a limited number of charging cycles before structural failure of the cell housing occurs.

[0003] Patent Document 1 discloses a hybrid battery cell module. A prismatic battery cell with a pouch battery cell is known from Patent Document 2. Patent Document 3 discloses a secondary battery cell and a manufacturing method thereof. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] U.S. Patent Application Publication No. 2019 / 0173065 [Patent Document 2] Korean Patent Registration No. 10-1546661 [Patent Document 3] Korean Patent Registration No. 10-0795781 Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to provide a battery cell in which the cell housing is subjected to less mechanical stress when the thickness of the electrode assembly changes. [Means for solving the problem]

[0006] This problem is solved by the features of claims 1, 6, 7 or 10. Preferred developments of the invention are disclosed in the dependent claims.

[0007] The present invention provides a battery cell (preferably according to the first embodiment) having a cell housing and at least one electrode assembly, the cell housing comprising a housing base and a housing cover, the housing base defining, together with the housing cover, an electrode-receiving chamber in which the electrode assembly is disposed. The housing cover is movably connected to the housing base, preferably by a flexible and / or elastic and / or permanently elastic sealing element. Due to the flexible connection of the housing cover to the housing base, the cell housing is subjected to significantly lower mechanical stresses than the cell housing described above (given the same change in thickness of the electrode assembly). Therefore, the cell housing can withstand significantly more charging cycles without damage.

[0008] The aspects described below mainly relate to the battery cell according to the first embodiment. Nevertheless, the aspects described below also relate to the battery cell according to the second embodiment.

[0009] By way of example, the housing base may be designed to be trough-shaped and / or dimensionally stable.

[0010] Preferably, it can be provided that the housing base has a housing bottom and preferably exactly four housing side walls.

[0011] For example, the housing side walls may each be connected to the housing bottom, and / or may be connected to the housing bottom using the same material, and / or may be integrally connected to the housing bottom.

[0012] For example, each housing side wall may be designed to have a side wall end surface.

[0013] As an example, the housing cover is essentially plate-shaped and / or dimensionally stable and / or immovable; and / or The housing bottom is essentially plate-shaped and / or dimensionally stable and / or immovable. The use of a plate-shaped, immovable housing cover has the advantage that uniform pressure can be applied to the electrode assembly via the housing cover in a simple manner.

[0014] Preferably, it can be envisaged that the cell housing is formed by an essentially prismatic, preferably cubic-shaped cell housing.

[0015] Particularly preferably, it can be provided that the housing base and / or the cell housing are rotationally symmetrical, in particular with respect to an axis of rotational symmetry of the cell housing.

[0016] Preferably, the sealing element is formed by a sealing tape or by a curable and / or cross-linkable and / or permanently elastic sealing material. A sealing material has the advantage that it can easily compensate for manufacturing tolerances between the housing base and the housing cover. A permanently elastic sealing material can be used particularly advantageously, especially when the thickness variation is small. A sealing tape has advantages over a sealing material when the thickness variation is large.

[0017] For example, the sealing element, or the sealing tape, or the curable and / or cross-linkable and / or permanently elastic sealant, respectively, may be intended to have the shape of a closed ring.

[0018] As an example, the electrode assembly may preferably be designed to be in direct abutting contact with the housing cover surface and / or housing bottom on the inside of the housing in all charging states of the electrode assembly.

[0019] Particularly preferably, it can be provided that the housing cover extends parallel to the housing bottom, preferably in all charged states of the electrode assembly.

[0020] By way of example, it may be provided that a circumferential annular gap extends between the housing cover and the housing side wall of the housing base in the circumferential direction relative to the rotationally symmetric axis of the housing base or relative to the rotationally symmetric axis of the cell housing. Preferably, the sealing element is arranged in the annular gap and preferably extends uninterrupted along the entire annular gap. An annular gap has the advantage that tight manufacturing tolerances do not have to be maintained between the housing cover and the housing base.

[0021] For example, it may be envisaged that the sealing element is connected to the inner cover surface of the housing of the housing cover and / or to a narrow side surface of the housing cover.

[0022] By way of example, it may be provided that the sealing element is preferably partially or completely connected to the inner surface of the housing side wall and / or to the side wall end surface of the housing side wall.

[0023] Preferably, the sealing element may be provided to seal the electrode-receiving chamber from the outside, particularly preferably gas-tight, preferably in the region of the annular gap, so that the electrode-receiving chamber is reliably sealed against the ingress of, for example, moisture or dirt.

[0024] Particularly preferably, when the electrode assembly is nearly fully charged or fully charged, the housing cover may at least partially protrude from the housing base. Alternatively, when the electrode assembly is nearly fully charged or fully charged, the housing cover may be flush with the sidewall end surface of the housing base. Alternatively, when the electrode assembly is nearly fully charged or fully charged, the housing cover may extend completely to the side of the end surface plane facing the housing bottom. For example, the sidewall end surface may extend within the end surface plane (preferably outside the recess).

[0025] Preferably, the sealing element is preferably curved and / or pressed outward, preferably radially outward, relative to the axis of rotational symmetry of the housing base and / or predominantly away from the housing base, and / or The housing cover extends completely to the side of the end surface plane facing the housing bottom when the electrode assembly is nearly completely discharged or completely discharged; and / or the sealing element is connected to the housing base and the housing cover such that the sealing element is in an extended state, preferably in the direction of the housing bottom, when the electrode assembly is at least substantially discharged; The sealing element may be bent and / or pressed radially outward, thereby preventing the sealing element from escaping into the electrode-receiving chamber, and thus preventing mechanical damage to the electrode stack by the sealing element.

[0026] By way of example, it may be provided that the housing side wall defines, in the region of the side wall end face, a preferably groove-shaped and / or cube-shaped recess into which the sealing element can escape, preferably when the electrode assembly is nearly or fully charged. The sealing element can therefore not only be pressed or bent radially outward, but also simultaneously move into the region of the recess. This ensures with a particularly high level of safety that the electrode stack cannot be damaged by the sealing element.

[0027] Preferably, the sealing element may be designed to be connected to the housing base and the housing cover such that the sealing element is in an unstretched and / or compressed state when the electrode assembly is nearly fully charged or fully charged.

[0028] For example, a battery cell may be designed to change its thickness as the state of charge of the electrode assembly changes, which may be referred to as "breathing."

[0029] As an example, the depth of the housing base and / or the electrode stack of the housing base may be contemplated to be dimensioned such that when the battery cells are nearly fully charged or fully charged, the housing cover protrudes from the housing base with a protrusion, and / or when the battery cells are nearly fully charged or fully charged, the housing cover does not protrude from the housing base. In either case, a recess may optionally be provided.

[0030] According to the present invention, an assembly is contemplated that includes a first battery cell according to the first embodiment and a second battery cell according to the first embodiment, the housing bottom of the first battery cell and the housing bottom of the second battery cell are aligned with each other; The housing bottom of the first battery cell and the housing bottom of the second battery cell are connected to each other, preferably using the same material and / or being one piece and / or being flat, which allows the two battery cells to be combined with each other in a simple and space-saving way.

[0031] For example, the housing cover may be designed to have an inner cover surface of the housing, an outer cover surface of the housing, and preferably have exactly four narrow sides.

[0032] According to the present invention, a battery cell, preferably according to the second embodiment, is provided, comprising a cell housing and at least one electrode assembly (preferably as described above), the cell housing comprising a housing base (preferably as described above) and a housing cover, and the housing base, together with the housing cover, defines an electrode-receiving chamber (preferably as described above) in which the electrode assembly is disposed. According to the present invention, the housing cover is preferably formed by a soft and / or flexible and / or pouch-like film. By configuring the housing cover to be soft and / or flexible, mechanical loads occurring during a charging cycle are absorbed by the stretching of the film. Thus, structural failure of the cell housing can be avoided.

[0033] By way of example, the material of the housing base is wholly or partly a synthetic resin, preferably a fiber-reinforced synthetic resin, and / or The material of the housing base is wholly or partly metallic, and / or The material of the housing base is metal and preferably fiber-reinforced synthetic resin. It may be envisaged that.

[0034] As an example, the housing base comprises a housing bottom and preferably exactly four housing side walls, each having an outer surface; and The film is attached to one, two, three, or all of the exterior surfaces of the housing side walls, either directly or indirectly through a synthetic resin coating as an intermediate layer, and is preferably glued or sealed to one, two, three, or all of the exterior surfaces of the housing side walls. It may be envisaged that.

[0035] According to the present invention, a first battery cell according to the second embodiment and a second battery cell according to the second embodiment are provided, The housing bottom of the first battery cell and the housing bottom of the second battery cell are aligned with each other; and The housing bottom of the first battery cell and the housing bottom of the second battery cell are connected to each other, preferably using the same material and / or being one piece and / or being flat, so that the two battery cells can be combined with each other in a simple and space-saving manner.

[0036] Preferably, it may be envisaged that the film of the first battery cell and the film of the second battery cell are connected using the same material and / or are integrally connected.

[0037] As an example, it may be contemplated that the film of the first battery cell and the film of the second battery cell are attached to the same outer surface of one of the housing side walls and / or are bonded to the same outer surface of one of the housing side walls.

[0038] As an example, the housing bottom of the first battery cell and the housing bottom of the second battery cell each protrude radially outward from the housing side wall, preferably in an annular shape, relative to the rotational symmetry axis of the battery housing; and the annular protrusion is not covered by one or more films and / or is not covered by a synthetic resin coating; may be envisaged.

[0039] The aspects described below relate to the battery cell according to the first embodiment and the battery cell according to the second embodiment.

[0040] As an example, the electrode assembly may be designed to include at least two electrodes, preferably plate-shaped or rectangular parallelepiped-shaped, and one (preferably plate-shaped) separator.

[0041] As an example, it is contemplated that the electrodes and separators may be stacked one above the other along the axis of rotational symmetry of the cell housing, with the separators being disposed between the electrodes and / or the electrodes being separated (preferably electrically and / or electrochemically) by the separators.

[0042] An electrode assembly formed by a plurality of electrodes stacked one above the other along the axis of rotational symmetry of the cell housing may be referred to as an electrode stack.

[0043] Preferably, it can be envisaged that the electrodes and the separator are preferably wound around a common winding axis, and in this case, it can be envisaged that the two electrodes are preferably electrically and / or electrochemically separated by the separator.

[0044] As an example, the housing base and / or the cell housing may be rotationally symmetric (preferably two- or four-fold) with respect to the axis of rotational symmetry of the cell housing, preferably extending perpendicularly to the housing bottom.

[0045] By way of example, it may be contemplated that the housing base is a component manufactured using the same material and / or is a single piece and / or integrally formed, or alternatively, that the housing base is joined to the housing sidewall.

[0046] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. [Brief explanation of the drawings]

[0047] [Figure 1] 1 shows a side cross-sectional view of a battery cell including a cell housing and an electrode assembly in an uncharged state according to a first embodiment. [Figure 2] 2 shows a cross-sectional side view of the assembly according to FIG. 1, including the cell housing and electrode assembly in a charged state. [Figure 3] 2 shows a side view of the housing side wall of the cell housing shown in FIG. 1. [Figure 4] 1 shows an assembly with two battery cells according to a first embodiment in a side cross-sectional view. [Figure 5] FIG. 1 shows a cross-sectional side view of a battery cell including a cell housing and an electrode assembly in a partially charged state according to a second embodiment. [Figure 6] 1 shows a cross-sectional side view of an assembly with two battery cells according to a second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0048] 1 shows a battery cell 1 according to a first embodiment, which comprises a cell housing and a rectangular parallelepiped electrode assembly 5. The cell housing comprises a trough-shaped, stationary housing base 7 having a housing bottom 9 and four housing side walls 11, and a stationary, plate-shaped housing cover 13.

[0049] Between the housing cover 13 and the housing side wall 11 extends an annular gap 15 with an annular gap width b. A sealing element 17 formed by a hardenable and / or cross-linkable and / or permanently elastic sealant extends in the annular gap 15, by means of which the housing cover 13 is flexibly and / or movably connected to the housing base 7, in particular so that the housing cover 13 can move essentially parallel to the housing bottom 9.

[0050] The housing base 7, the housing cover 13 and the sealing element 17 together define an electrode-receiving chamber 19 in which the electrode assembly 5 is arranged. The electrode assembly 5 is formed by electrodes 21 and separators 23, each one of the separators 23 being arranged between two adjacent electrodes 21. The housing base 7 and the cell housing are each rotationally symmetric (preferably two- or four-fold) about an axis of rotational symmetry A.

[0051] The sealing element 17 is connected to the housing side wall 11 in the region of the side wall end face 25 of the housing side wall 11. Furthermore, the sealing element 17 is connected to the housing inner cover surface 27 of the housing cover 13 and to the narrow side surface 29 of the housing cover 13.

[0052] The sealing element 17 hermetically seals the electrode-receiving chamber 19 from the outside, and the flexible connection of the housing cover 13 to the housing base 7 allows the height of the electrode-receiving chamber 19 to be adapted to the stack thickness of the electrode assembly 5 (which increases with increasing state of charge of the electrode assembly 5). When the battery cell is fully charged, the electrode assembly 5 has its maximum stack thickness d1. At the same time, the electrode-receiving chamber 19 also has its maximum height. This charged state is shown, for example, in FIG. 2. When the battery cell is discharged, the electrode assembly 5 has its minimum stack thickness d0. At the same time, the electrode-receiving chamber 19 also has its minimum height. This charged state is shown, for example, in FIG. 1, where the housing cover 13 extends on the side of the end plane S (see FIG. 3) facing the housing bottom 9. Outside the recess 26, the side wall end surface 25 extends to the end plane S (see FIG. 3).

[0053] The housing base depth t (see FIG. 1 ) of the housing base 7 is calculated so that, when the battery cells 1 are fully charged, the housing cover 13 with the protrusion 31 protrudes from the housing base 7, as shown in FIG. 2 . As shown in FIG. 2 , the sealing element 17 is sized and connected to the housing cover 13 and the housing base 7 in the manner described above so that, in a nearly fully charged or fully charged state, the sealing element 17 is at least partially offset radially outward from the housing base 7 by the radial protrusion 33 relative to the axis of rotational symmetry A. When the battery cells 1 are fully charged, the housing cover 13 is positioned entirely between the side wall end surface 25 and the housing bottom 9 relative to the axis of rotational symmetry A, as depicted in FIG. 1 .

[0054] 3, one of the housing side walls 11 is shown in side view. The housing side wall 11, and specifically the side wall end surface 25, defines a recess 26 into which the sealing element 17 at least partially escapes when the electrode assembly 5 is in a nearly fully charged or fully charged state.

[0055] 4 shows an assembly 35 having two identical battery cells 1. The housing bases 9 of the battery cells 1 are made of the same material and are integrally connected, in particular the housing side walls 11 of the battery cells 1 are axially aligned with each other about the axis of rotational symmetry A. The battery cells 1 are plane-symmetrical with respect to a first plane of symmetry E1 extending between the housing bottoms 9 of the battery cells 1.

[0056] 5 depicts a battery cell 41 according to a second embodiment. Components having the same structure and / or the same behavior and / or the same function as those already described in relation to the first embodiment are designated with the same reference numerals in relation to the first embodiment and in relation to the second embodiment. In this regard, reference is made to the detailed description in relation to the first embodiment.

[0057] The battery cell 41 includes a housing base portion 7 and an electrode assembly 5. The housing base portion 7, together with a housing cover 43, defines an electrode-receiving chamber 45.

[0058] In contrast to the first embodiment, in this battery cell 41 the housing cover 43 is preferably formed by a soft and / or flexible and / or pouch-film-like film.

[0059] The housing base 7 is made of metal and has a synthetic resin coating 47 on the outer surface of the housing side wall 11, and a housing cover 43 made of a film is adhered onto the synthetic resin coating 47.

[0060] 6 depicts an assembly 51 comprising two identical battery cells 41. The housing base portions 9 of the battery cells 41 are made of the same material and are integrally connected, and in particular the housing side walls 11 of the battery cells 41 are axially aligned with one another about the axis of rotational symmetry A. The battery cells 41 are plane-symmetrical with respect to a second plane of symmetry E2 extending between the housing bottom portions 9 of the battery cells 41.

[0061] As depicted in Figure 6, in the region of the housing base part 9, the assembly 51 may be provided with a radially outwardly projecting annular projection 53 (shown in dashed lines), which is neither covered by the film nor by the synthetic resin coating 47. Via this annular projection 53, the assembly 51 can be particularly efficiently connected to a cooling system (not shown) of the battery cells 41.

[0062] The films of the two battery cells 41 can be connected to each other using the same material and / or be integral, and both can be adhered to a synthetic resin coating 47 applied to the outer surface of the housing side wall 11. The present application relates to the invention described in the claims, but also includes the following as other aspects. 1. A battery cell comprising a cell housing and at least one electrode assembly (5), The cell housing comprises a housing base (7) and a housing cover (13), The housing base (7) together with the housing cover (13) defines an electrode-receiving chamber (19) in which the electrode assembly (5) is disposed. In the battery cell, A battery cell, characterized in that the housing cover (13) is movably connected to the housing base (7) by means of a sealing element, preferably flexible and / or elastic and / or permanently elastic. 2. 2. The battery cell according to claim 1, wherein the sealing element (17) is formed by a sealing tape or by a curable and / or cross-linkable and / or permanently elastic sealing material. 3. Between the housing cover (13) and the housing side wall (11) of the housing base (7), an annular gap (15) extends in the circumferential direction relative to the axis of rotational symmetry (A) of the housing base (7) or the cell housing, In this case, the battery cell according to claim 1 or 2, characterized in that the sealing element (17) is preferably arranged within the annular gap (15) and preferably extends uninterrupted along the entire annular gap (15). 4. 4. A battery cell as described in claim 3, characterized in that the sealing element (17) seals the electrode-accommodating chamber (19) to the outside, preferably airtight, preferably within the annular gap (15). 5. the housing cover (13) at least partially protrudes from the housing base (7) when the electrode assembly (5) is nearly fully charged or fully charged; and / or the sealing element (17) is preferably curved and / or pressed against the axis of rotational symmetry (A) of the housing base (7) and / or mostly outwardly, preferably radially outwardly, from the housing base (7); and / or the housing cover (13) extends entirely on the side of the end surface (S) facing the housing bottom (9) when the electrode assembly (5) is almost completely discharged or completely discharged; and / or the sealing element (17) is connected to the housing base (7) and the housing cover (13) in such a way that the sealing element (17) is in an elongated state, preferably in the direction of the housing bottom (9), when the electrode assembly is at least substantially discharged; 5. The battery cell according to any one of the above items 1 to 4. 6. An assembly including the first battery cell (1) described in any one of 1 to 5 above and the second battery cell (1) described in any one of 1 to 5 above, The housing bottom (9) of the first battery cell (1) and the housing bottom (9) of the second battery cell (1) are aligned with each other; and An assembly in which the housing bottom (9) of the first battery cell (1) and the housing bottom (9) of the second battery cell (1) are connected to each other, preferably using the same material and / or being integral and / or flat. 7. A battery cell comprising a cell housing and at least one electrode assembly (5), The cell housing comprises a housing base (7) and a housing cover (43), The housing base (7), together with a housing cover (43), defines an electrode-accommodating chamber (45) in which the electrode assembly (5) is disposed. The battery cell, characterized in that the housing cover (43) is preferably formed by a soft and / or flexible and / or pouch-like film. 8. the material of said housing base (7) is wholly or partly a synthetic resin, preferably a fiber-reinforced synthetic resin, and / or the material of said housing base (7) is wholly or partly metallic, and / or The material of the housing base (7) comprises metal and preferably fiber-reinforced synthetic resin. 8. The battery cell according to claim 7, 9. the housing base (7) comprises a housing bottom (9) and preferably exactly four housing side walls (11), each having an outer surface; and The film is attached to one, two, three or all of the outer surfaces of the housing side walls (11) either directly or indirectly through an intermediate synthetic resin coating (47), preferably glued or sealed to one, two, three or all of the outer surfaces of the housing side walls (11). 9. The battery cell according to claim 7 or 8, 10. An assembly comprising the first battery cell (41) according to any one of 7 to 9 above and the second battery cell (41) according to any one of 7 to 9 above, the housing bottom (9) of the first battery cell (41) and the housing bottom (9) of the second battery cell (41) are arranged to coincide with each other, An assembly in which the housing bottom (9) of the first battery cell (41) and the housing bottom (9) of the second battery cell (41) are connected to each other, preferably using the same material and / or being integral and / or flat. [Explanation of symbols]

[0063] 1 battery cell 5 Electrode assembly 7 Housing base 9 Bottom of the housing 11 Housing side wall 13 Housing cover 15 Annular gap 17 Sealing Elements 19 Electrode housing chamber 21 electrodes 23 Separator 25 Side wall end face 26 Recess 27 Housing inner cover surface 29 Narrow Side 31 Protrusion 33 Radial protrusions 35 Assembly 41 Battery Cells 43 Housing cover 45 Electrode housing chamber 47 Synthetic resin coating 51 Assembly 53 Annular protrusion A Rotational axis b Annular gap region d0 Minimum gap thickness d1 Maximum gap thickness t Depth of housing base E1 First symmetry plane E2 Second symmetry plane S end plane

Claims

1. An assembly comprising a first battery cell (1) and a second battery cell (1), The first battery cell (1) and the second battery cell (1) each include a cell housing and at least one electrode assembly (5); (a) the cell housing comprises a housing base (7) and a housing cover (13); (b) the housing base (7) together with the housing cover (13) defines an electrode-receiving chamber (19) in which the electrode assembly (5) is disposed; (c) the housing cover (13) is movably connected to the housing base (7) by a sealing element (17); - the housing bottom (9) of the first battery cell (1) and the housing bottom (9) of the second battery cell (1) are arranged in a congruent relationship with each other; and - an assembly in which the housing bottom (9) of the first battery cell (1) and the housing bottom (9) of the second battery cell (1) are connected to each other.

2. Assembly according to claim 1, characterized in that the sealing element (17) is formed by a sealing tape or by a curable and / or cross-linkable and / or permanently elastic sealing material.

3. 2. An assembly according to claim 1, characterized in that between the housing cover (13) and the housing side wall (11) of the housing base (7) there extends a circumferential annular gap (15) relative to the axis of rotational symmetry (A) of the housing base (7) or the cell housing.

4. An assembly as described in claim 3, characterized in that the sealing element (17) is arranged within the annular gap (15) and extends continuously along the entire annular gap (15).

5. 5. An assembly according to claim 4, characterized in that the sealing element (17) seals the electrode-receiving chamber (19) against the outside.

6. the housing cover (13) at least partially protrudes from the housing base (7) when the electrode assembly (5) is nearly fully charged or fully charged; and / or the sealing element (17) is bent and / or pressed outward from the housing base (7), and / or the housing cover (13) extends entirely on the side of the end surface (S) facing the housing bottom (9) when the electrode assembly (5) is almost completely discharged or completely discharged; and / or the sealing element (17) is connected to the housing base (7) and the housing cover (13) so that the sealing element (17) is in an extended state when the electrode assembly is at least substantially discharged; 10. The assembly of claim 1, wherein:

7. An assembly comprising a first battery cell (41) and a second battery cell (41), The first battery cell (1) and the second battery cell (1) each include a cell housing and at least one electrode assembly (5); (a) the cell housing comprises a housing base (7) and a housing cover (43); (b) the housing base (7) together with the housing cover (43) defines an electrode-receiving chamber (45) in which the electrode assembly (5) is disposed; (c) the housing cover (43) is formed of a film, the housing bottom (9) of the first battery cell (41) and the housing bottom (9) of the second battery cell (41) are arranged in a coincident relationship with each other; - an assembly in which the housing bottom (9) of the first battery cell (41) and the housing bottom (9) of the second battery cell (41) are connected.

8. An assembly as described in Claim 7, characterized in that the housing cover (43) is formed by a flexible and / or pliable and / or pouch-film-like film.

9. the material of said housing base (7) is wholly or partly synthetic resin, and / or the material of said housing base (7) is wholly or partly metallic, and / or The material of the housing base (7) comprises metal and synthetic resin.

9. The assembly according to claim 8, characterized in that

10. The housing base (7) comprises a housing bottom (9) and housing side walls (11), each having an outer surface; and The film is attached to one, two, three or all of the outer surfaces of the housing sidewalls (11) either directly or indirectly through a synthetic resin coating (47) as an intermediate layer.

9. The assembly of claim 8.

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