DE102021131936A1 - battery cell - Google Patents

Abstract

A battery cell has a housing, an electrode stack arrangement, a first connection element and a second connection element, which housing has a first housing side and a second housing side, which first housing side has a first housing wall and which second housing side has a second housing wall, which first housing side has the second housing side is provided opposite, which first connection element is provided on the first side of the housing and can be contacted from the outside on the first side of the housing, which second connection element is provided on the second side of the housing and can be contacted from the outside on the second side of the housing, which electrode stack arrangement is arranged in the housing and first Has electrode arrangements and second electrode arrangements, which first electrode arrangements have first electrodes and first strip elements, which second electrode arrangements have second electrodes and second strip elements, which first electrodes and second electrodes extend in a first longitudinal direction between the first housing side and the second housing side, which first connection element is electrically connected to the first electrodes via the first strip elements, and which second connection element is electrically connected to the second electrodes via the second strip elements.

Description

The invention relates to a battery cell.

The DE 10 2018 207 330 A1 shows a storage cell with two side wall elements designed as terminals. Two electrodes are electrically connected to the side wall elements on their flat side via lugs.

The DE 10 2018 207 328 A1 shows a prismatic cell with two laterally arranged covers, each having a connection element.

The DE 10 2018 207 327 A1 shows a prismatic battery cell with covers and laterally arranged connection elements.

The DE 10 2017 202 354 A1 shows a battery housing in which at least one cell pack with at least one battery cell is provided.

It is therefore an object of the invention to provide a new battery cell.

This object is solved by the subject matter of the independent patent claim.

A battery cell is designed as a prismatic battery cell with a housing, an electrode stack arrangement, a first connection element and a second connection element, which housing has a cuboid basic shape with a first housing side and a second housing side, which first housing side has a first housing wall and which second housing side has a second housing wall which first side of the housing is provided opposite to the second side of the housing, which first connection element is provided on the first side of the housing and can be contacted from the outside on the first side of the housing, which second connection element is provided on the second side of the housing and can be contacted from the outside on the second side of the housing, which electrode stack arrangement is arranged in the housing and has first electrode arrangements and second electrode arrangements, which first electrode arrangements have first electrodes and first strip elements, which second electrode arrangements have second electrodes and second strip elements, which first electrodes and second electrodes extend in a first longitudinal direction between the first housing side and the second housing side, which first connection element is electrically connected to the first electrodes via the first strip elements, and which second connection element is electrically connected to the second electrodes via the second strip elements. The provision of the connection elements on opposite sides and the corresponding alignment of the electrode arrangements enable short connection paths between the electrodes and the connection elements. This enables low electrical resistance, good cooling via the strip elements, and a compact design.

According to a preferred embodiment, the battery cell is designed as a lithium ion battery cell. These battery cells enable a high capacity per mass and an advantageous choice of material for the strip elements.

According to a preferred embodiment, the battery cell has a first insulation element and a second insulation element, the first connection element is electrically insulated from the first housing wall by the first insulation element, and the second connection element is electrically insulated from the second housing wall by the second insulation element. Electrical isolation increases safety and allows the use of electrically conductive materials such as metals for the enclosure wall of the enclosure.

According to a preferred embodiment, separators are provided between the first electrodes and second electrodes in the electrode stack arrangement. Separators are beneficial for certain battery cell types.

• - das erste Anschlusselement,
• - das zweite Anschlusselement, oder
• - das erste Anschlusselement und das zweite Anschlusselement mindestens 30 % der gesamten Außenfläche der zugeordneten Gehäuseseite ein, bevorzugt mindestens 40 %, weiter bevorzugt mindestens 50 %, weiter bevorzugt mindestens 60 %, weiter bevorzugt mindestens 70 %, weiter bevorzugt mindestens 80 % und weiter bevorzugt mindestens 90 %. Ein großes Anschlusselement ermöglicht bei der Kontaktierung aufgrund der großen Fläche einen vergleichsweise geringen elektrischen Widerstand. Gerade die Kontaktierungsstellen weisen häufig einen vergleichsweise großen Widerstand auf. Zudem ermöglicht ein großes Anschlusselement eine gute Kühlleistung im Anschlussbereich und verbessert hierdurch die Gesamt-Kühlleistung. Ein weiterer Vorteil eines großen Anschlusselements besteht in der Möglichkeit, die Streifenelemente mit einer großen Breite in Richtung zum Anschlusselement zu kontaktieren. Dies verbessert den elektrischen Widerstand gegenüber einem schmalen Streifenelement um beispielsweise 20 % bis 80 %.

According to a preferred embodiment

• - the first connecting element,
• - the second connecting element, or
• - the first connection element and the second connection element occupy at least 30% of the entire outer surface of the associated side of the housing, preferably at least 40%, more preferably at least 50%, more preferably at least 60%, more preferably at least 70%, more preferably at least 80% and more preferably at least 90%. A large connection element enables a comparatively low electrical resistance when making contact due to the large area. The contact points in particular often have a comparatively high resistance. In addition, a large connection element enables good cooling performance in the connection area and thus improves the overall cooling performance. A further advantage of a large contact element is the possibility of contacting the strip elements with a large width in the direction of the contact element. This improves the electric Resistance to a narrow strip element by, for example, 20% to 80%.

According to a preferred embodiment, the first strip elements extend into a first region between the first electrodes and the first connection element, and the second strip elements extend into a second region between the second electrodes and the second connection element. As a result, the strip elements have a comparatively direct path between the associated electrodes and the associated connection elements.

According to a preferred embodiment, the housing has a first cover element, which first cover element forms the first housing wall and the first connection element at least in sections. Such a cover element facilitates manufacture and sealing in this area.

According to a preferred embodiment, the housing has a second cover element, which second cover element forms the second housing wall and the second connection element at least in sections.

According to a preferred embodiment, the first electrodes have a maximum first electrode width transversely to the first longitudinal direction between the first housing side and the second housing side, and the first strip elements have a minimum strip element width between the associated first electrode and the first connection element, which is at least 40% of the maximum first electrode width is preferably at least 50%, more preferably at least 60%, more preferably at least 70%, more preferably at least 80%, more preferably at least 90% and more preferably at least 100%. Such wide strip elements enable contacting of the electrodes with low electrical resistance and a good cooling capacity via the strip elements.

According to a preferred embodiment, the second electrodes have a maximum second electrode width transversely to the first longitudinal direction between the first housing side and the second housing side, and the second strip elements have a minimum strip element width between the associated second electrode and the second connection element, which is at least 40% of the maximum second electrode width is preferably at least 50%, more preferably at least 60%, more preferably at least 70%, more preferably at least 80%, more preferably at least 90% and more preferably at least 100%. Such wide strip elements enable contacting of the electrodes with low electrical resistance and a good cooling capacity via the strip elements.

• - das erste Anschlusselement,
• - das zweite Anschlusselement, oder
• - das erste Anschlusselement und das zweite Anschlusselement weisen eine maximale Anschlusselementbreite auf, welche maximale Anschlusselementbreite mindestens 40 % der ersten Elektrodenbreite beträgt, bevorzugt mindestens 50 %, weiter bevorzugt mindestens 60 %, weiter bevorzugt mindestens 70 %, weiter bevorzugt mindestens 80 %, weiter bevorzugt mindestens 90 % und weiter bevorzugt mindestens 100 %. Dies ermöglicht eine vergleichsweise lange Anbindung der Streifenelemente an die Anschlusselemente.

According to a preferred embodiment, the first electrodes have a maximum first electrode width transversely to the first longitudinal direction between the first housing side and the second housing side, and

• - the first connecting element,
• - the second connecting element, or
• - The first connection element and the second connection element have a maximum connection element width, which maximum connection element width is at least 40% of the first electrode width, preferably at least 50%, more preferably at least 60%, more preferably at least 70%, more preferably at least 80%, more preferably at least 90% and more preferably at least 100%. This enables a comparatively long connection of the strip elements to the connecting elements.

• - auf der ersten Gehäuseseite,
• - auf der zweiten Gehäuseseite, oder
• - auf der ersten Gehäuseseite und auf der zweiten Gehäuseseite

ein Entlüftungsventil auf, um im Falle eines Überdrucks eine Entgasung aus der Batteriezelle zu ermöglichen. Das Entlüftungsventil lässt sich gut auf der Gehäuseseite des Anschlusselements oder der Anschlusselemente vorsehen, und insbesondere in Kombination mit den Deckelementen ergibt sich eine einfache Montage.According to a preferred embodiment, the housing

• - on the first side of the case,
• - on the second side of the case, or
• - on the first side of the housing and on the second side of the housing

a vent valve to allow degassing from the battery cell in the event of excess pressure. The vent valve can easily be provided on the housing side of the connection element or the connection elements, and in particular in combination with the cover elements, assembly is simple.

According to a preferred embodiment, the first electrode arrangements each have a first film which is electrically conductive, which forms the first strip element and which extends into a third area of the first electrode, with at least one first active material layer being provided on the first film in the third area . The film can serve as a discharge film and can be provided both in the electrode area and in the strip element area. This enables the electrode arrangement to be manufactured cheaply.

According to a preferred embodiment, a first sealing element is provided between the first connection element and the first housing wall, and a second sealing element is provided between the second connection element and the second housing wall, which first Sealing element and which second sealing element are provided to prevent leakage of an electrolyte between the respective connection element and the associated housing wall.

• 1 in schematischer Darstellung von oben eine Batteriezelle,
• 2 in schematischer Darstellung von vorne die Batteriezelle von 1,
• 3 in schematischer Darstellung von links die Batteriezelle von 1,
• 4 in einer Seitenansicht eine Elektrodenanordnung,
• 5 in einer Draufsicht die Elektrodenanordnung von 4,
• 6 in einer in Längsrichtung geschnittenen Darstellung die Batteriezelle von 1,
• 7 in schematischer Darstellung von links eine weitere Ausführungsform der Batteriezelle von 1,
• 8 in einer Seitenansicht die Elektrodenanordnung von 4 mit einem Anschlusselement,
• 9 in einer Seitenansicht eine weitere Ausführungsform der Elektrodenanordnung von 4, und
• 10 in einer Seitenansicht eine weitere Ausführungsform der Elektrodenanordnung von 4.

Further details and advantageous developments of the invention result from the exemplary embodiments described below and illustrated in the drawings, which are in no way to be understood as limiting the invention, and from the dependent claims. It goes without saying that the features mentioned above and those still to be explained below can be used not only in the combination specified in each case, but also in other combinations or on their own, without departing from the scope of the present invention. It shows:

• 1 a battery cell in a schematic representation from above,
• 2 in a schematic representation from the front of the battery cell 1 ,
• 3 in a schematic representation from the left the battery cell of 1 ,
• 4 in a side view an electrode arrangement,
• 5 in a plan view the electrode arrangement of FIG 4 ,
• 6 in a longitudinally sectioned representation of the battery cell 1 ,
• 7 in a schematic representation from the left another embodiment of the battery cell of 1 ,
• 8th in a side view the electrode arrangement of 4 with a connection element,
• 9 in a side view a further embodiment of the electrode arrangement of FIG 4 , and
• 10 in a side view a further embodiment of the electrode arrangement of FIG 4 .

In the following, parts that are the same or have the same effect are provided with the same reference symbols and are usually only described once. The description builds on one another across figures in order to avoid unnecessary repetition. Unless otherwise stated, terms such as left, right, up and down are not absolute terms and can vary, for example, depending on the installation position or the respective representation. But it is a preferred embodiment.

1 shows a battery cell 20 from above. The battery cell 20 is designed as a prismatic cell and has a housing 30, a connection element 38 and a connection element 39.

The housing 30 has a cuboid basic shape with a housing side 31 (top), a housing side 33 (left), a housing side 34 (right), a housing side 35 (front) and a housing side 36 (rear). The housing side 33 is provided opposite to the housing side 34, so they are on opposite sides of the housing 30. The connection element 38 is provided on the housing side 33 and can be contacted on the housing side 33 from the outside. The connecting element 39 is provided on the housing side 34 and can be contacted from the outside on the housing side 34 . The battery cell 20 can provide electrical energy via the connection elements 38, 39, and the connection elements 38, 39 can also be referred to as poles.

2 shows the battery cell 20 of FIG 1 in an illustration from the housing side 35 (front).

The housing side 32 (bottom) is provided opposite the housing side 31 (top).

3 shows the battery cell 20 of FIG 1 in an illustration from the housing side 33 (left). A housing wall 42 and the connection element 38 are provided on the housing side 33 . An insulation element 43 is shown schematically between the connection element 38 and the housing wall 42, and the insulation element 43 enables electrical insulation between the connection element 38 and the housing wall 42. This enables the housing wall 42 to be formed from a conductive material, e.g. from a metal. Forming the housing wall 42 from a material with good thermal conductivity, such as metal, allows for good heat dissipation of the heat generated in the battery cell 36 during operation.

The connection element 38 preferably occupies a comparatively large proportion of the area of the housing side 33, for example 80% or 90%.

4 shows a side view of an electrode arrangement 51 or 52, which has an electrode 61 or 62 and a strip element 55 or 56. Such strip elements 55, 56 are referred to in English as "tab" and are used to contact the electrode 61 or 62.

The electrode 61, 62 has a longitudinal direction 91 and a transverse direction 92 transverse to the longitudinal direction.

5 shows the electrode arrangement 51, 52 from FIG 4 .

The electrode arrangement 51 or 52 has a film 53, which is also referred to as a conductor film and allows current to flow as an electrical conductor. In the area of the electrodes 61, 62, an active material layer 54 is provided on one side of the film 53 or on both sides. The thickness 93 of the electrodes 61, 62 is preferably in the range of 15 μm to 2 mm.

The strip element 55 or 56 is preferably at least partially or completely free of the active material layer 54, since this region is not effective for the galvanic cell and is also usually less electrically conductive than the film 53. In addition, the strip element 55 or .

The thickness 94 is preferably in the range of 4 μm to 50 μm.

The battery cell is preferably designed as a lithium-ion battery cell.

• - Lithium-Cobalt(III)-Oxid,
• - Lithium-Nickel-Mangan-Cobalt-Oxid,
• - Lithium-Nickel-Cobalt-Aluminium-Oxid, oder
• - Lithiumeiesenphosphat.

Here, the positive electrode assembly 51 preferably has a foil 53 made of aluminum or an aluminum alloy, and the active material layer 54 preferably has an active material such as

• - lithium cobalt(III) oxide,
• - lithium nickel manganese cobalt oxide,
• - lithium nickel cobalt aluminum oxide, or
• - lithium iron phosphate.

• - Graphit,
• - nanokristallines, amorphes Silicium,
• - Lithiumtitanat, oder
• - Zinndioxid.

The negative electrode assembly 52 preferably includes a copper or copper alloy foil 53, and the active material layer 54 preferably includes an active material such as

• - graphite,
• - nanocrystalline, amorphous silicon,
• - lithium titanate, or
• - tin dioxide.

The active material layers 54 can each additionally have additives.

• - Natrium-Schwefel-Batteriezelle,
• - Nickel-Eisen-Batteriezelle, oder
• - Nickel-Zink-Batteriezelle.

The battery cell 20 can also be constructed as a different cell type, for example as a

• - sodium-sulphur battery cell,
• - Nickel-iron battery cell, or
• - Nickel-zinc battery cell.

The battery cell 20 is preferably rechargeable, and such a battery cell 20 is also referred to as a secondary cell or secondary element.

6 shows the battery cell 20 from above in a longitudinal section.

An electrode stack assembly 50 is provided in the case 30 , and the electrode stack assembly 50 includes the electrode assemblies 51 and the electrode assemblies 52 . Separators 63 are provided between the electrodes 61 of the electrode assemblies 51 and the electrodes 62 of the electrode assemblies 52 . In the exemplary embodiment, electrodes 61 and electrodes 62 are always provided alternately. It is also possible, at least partially, for example in the middle, to provide two identical electrodes 61 or two identical electrodes 63 adjacent to one another.

An electrolyte 64 is also provided in the housing 30 in order to enable an ion flow.

The electrodes 61 and 62 extend in their longitudinal direction 91 between the housing side 33 and the housing side 34. The longitudinal direction 91 is therefore defined relative to the housing sides 33, 34. All electrodes 61, 62 preferably extend in the same longitudinal direction 91, but the longitudinal direction 91 can also be at least partially different. The strip members 55 of the electrode assemblies 51 are positioned on the side associated with the case 33 side, and the strip members 56 are positioned on the side associated with the case 34 side. The terminal member 38 is electrically connected to the electrodes 61 via the strip members 55 and the terminal member 39 is electrically connected to the electrodes 62 via the strip members 56 .

The housing 30 has a housing wall 41 on the housing side 33 and a housing wall 42 on the housing side 34 . The housing 30 has the insulating element 43 and an insulating element 44 . The connection element 38 is electrically insulated from the housing wall 41 by the insulation element 43 , and the connection element 39 is electrically insulated from the housing wall 42 by the insulation element 44 . This preferably provided electrical insulation by the insulation elements 43, 44 allows a comparatively free choice of material for the housing walls of the housing 30. In particular, a short circuit of the two connection elements 33, 34 via a possibly electrically conductive housing wall is prevented. Because of their good thermal conductivity, metals are well suited as a housing wall for the housing 30, for example aluminum nium, an aluminum alloy or titanium. The insulation of the housing 30 from the connection elements 38, 39 is particularly advantageous when battery cells are connected in series, since in such a series connection the individual connection elements 38, 39 can be at a comparatively high voltage compared to the reference point on the chassis.

The insulation elements 43, 44 are preferably also designed as sealing elements 45, 46, and they prevent the electrolyte 64 from escaping between the respective connection element 38, 39 and the associated housing wall 41, 42. The sealing function can also be provided by additional sealing elements 45, 46 independently of be realized with the insulation elements.

The housing 30 preferably has a cover element 71 and a cover element 72 .

The cover element 71 forms the housing wall 41 and the connection element 38 at least in sections. The insulation element 43 is preferably also formed by the cover element 71 .

In the same way, the cover element 72 preferably forms the housing wall 42 and the connection element 38 at least in sections.

The insulation element 44 is preferably also formed by the cover element 72 .

This advantageous embodiment of the cover elements 71, 72 enables the housing 30 to be closed in order to prevent the electrolyte 64 from escaping, and the insulating elements 43, 44 can advantageously be formed in the respective cover element 71 or 72, on the other hand.

The housing 30 can be formed in the area of the housing sides 31, 32, 35, 36, for example, by a profile or by a plurality of housing walls connected to one another.

7 shows a further embodiment of the battery cell 20 in a side view from the housing side 33 . The connection element 38 takes in comparison to the embodiment of 6 a smaller proportion of the total area of the housing side 33, for example 60%. In the exemplary embodiment, a ventilation valve 40 is additionally provided on the housing side 33 in order to enable degassing from the battery cell 20 in the event of excess pressure. Battery cells 20 can experience significant heating when defective or damaged, and such heating can cause the electrolyte 64 to vaporize and create high pressure. For safety reasons, it is advantageous in such a case to release the high pressure via the vent valve 40 in a controlled manner. The vent valve 40 can be a pressure relief valve, for example. It can preferably be formed by a flat wall which is less stable than the housing wall 41 due to the thickness and/or the material Opening with a force applied sealing possible, for example in the form of a sphere or a semicircle.

By way of example, the housing 30 in this exemplary embodiment has a cuboid basic shape with rounded corners.

8th shows the electrode arrangement 51 or 52, and the maximum electrode width 65 is indicated. In the exemplary embodiment, the maximum electrode width 65 also corresponds to the average electrode width, since the electrode 61 or 62 has a rectangular basic shape.

The strip element 55 or 56 has a minimum strip element width 66, which in the exemplary embodiment also corresponds to the average strip element width, since the strip element 55 or 56 has a rectangular basic shape. In addition to the electrode arrangement 51, 52, the connection element 39 is drawn in by way of example, with no contact having yet taken place between the connection element 39 and the electrode arrangement 62.

The minimum strip element width 66 is preferably at least 40% of the maximum first electrode width 65, more preferably at least 50%, more preferably at least 60%, more preferably at least 70%, more preferably at least 80%, more preferably at least 90% and particularly preferably at least 100% . The strip element width 66 can also be larger than the electrode width 65.

Experiments have shown that the largest possible strip element width 66 results in a comparatively low electrical resistance for the current flow through the strip element 55 or 56. The flow of heat over the strip element 55 or 56 can also be increased by a large strip element width 66 .

9 shows an example of a further embodiment of the electrode arrangement 51 or 52. The strip element 55 or 56 becomes somewhat narrower towards the end, and this may be necessary, for example, if there is insufficient installation space in the housing 30 in this area. The minimal streak fenelementbreite 66 is thus less than in the embodiment of 8th . When determining the minimum strip element width 66, the region 95 of the strip element 55 or 56 between the associated electrode 61 or 62 and the associated connection element 38 or 39 is important. If - as shown - the outer area of the strip element 55 or 56 is used for contacting with the associated connection element 38 or 39, the minimum strip element width 66 is thus greater in the exemplary embodiment, since the outermost area of the strip element 55 or 56 with the associated connection element 38 or 39 is connected.

10 shows a further embodiment of an electrode arrangement 51 or 52. In this embodiment, the strip element 55 or 56 becomes smaller in sections and also larger again. As can be seen, different embodiments are possible and the available installation space can be well utilized.

A wide range of variations and modifications are of course possible within the scope of the present invention.

Reference List

20

battery cell

30

Housing

31

case side (top)

32

Housing side (bottom)

33

Housing side (left)

34

Housing side (right)

35

Housing side (front)

36

case side (rear)

38

first connection element

39

second connection element

40

degassing valve

41

first housing wall

42

second housing wall

43

first insulation element

44

second insulation element

45

first sealing element

46

second sealing element

50

electrode stack arrangement

51

first electrode arrangement

52

second electrode arrangement

53

first slide

54

active material layer

55

first strip element

56

second strip element

57

first area

58

second area

61

first electrode

62

second electrode

63

separator

64

electrolyte

65

electrode width

66

strip element width

91

longitudinal direction

92

transverse direction

93

thickness of the electrode

94

Thickness of strip element

95

Area

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• DE 102018207330 A1 [0002]
• DE 102018207328 A1 [0003]
• DE 102018207327 A1 [0004]
• DE 102017202354 A1 [0005]

Claims (13)

Battery cell (20), which is designed as a prismatic battery cell with a housing (30), an electrode stack arrangement (50), a first connection element (38) and a second connection element (39), which housing (30) has a cuboid basic shape with a first housing side (33) and a second housing side (34), which first housing side (33) has a first housing wall (41) and which second housing side (34) has a second housing wall (42). , which first housing side (33) is provided opposite to the second housing side (34), which first connection element (38) is provided on the first housing side (33) and can be contacted from the outside on the first housing side (33), which second connection element (39) is provided on the second housing side (34) and can be contacted from the outside on the second housing side (34), which electrode stack arrangement (50) is arranged in the housing (30) and has first electrode arrangements (51) and second electrode arrangements (52), which first electrode arrangements (51) have first electrodes (61) and first strip elements (55), which second electrode arrangements (52 ) have second electrodes (62) and second strip elements (56), which first electrodes (61) and second electrodes (62) extend in a first longitudinal direction (91) between the first housing side (33) and the second housing side (34), which first connection element (38) is electrically connected to the first electrodes (61) via the first strip elements (55), and which second connection element (39) is electrically connected to the second electrodes (62) via the second strip elements (56). Battery cell (20) after claim 1 , which is designed as a lithium-ion battery cell. Battery cell (20) after claim 1 or 2 , which has a first insulation element (43) and a second insulation element (44), in which the first connection element (38) is electrically insulated from the first housing wall (41) by the first insulation element (43), and in which the second connection element ( 39) is electrically insulated from the second housing wall (42) by the second insulating element (44). Battery cell (20) according to one of the preceding claims, in which separators (63) are provided between the first electrodes (61) and second electrodes (62) in the electrode stack arrangement (50). Battery cell (20) according to any one of the preceding claims, wherein - the first connection element (38), - The second connection element (39), or - the first connection element (38) and the second connection element (39) take up at least 30% of the entire outer surface of the associated housing side (33, 34), preferably at least 40%, more preferably at least 50%, more preferably at least 60%, more preferably at least 70%, more preferably at least 80% and more preferably at least 90%. Battery cell (20) according to one of the preceding claims, in which the first strip elements (55) extend into a first region (57) between the first electrodes (61) and the first connection element (38), and in which the second strip elements ( 56) extend into a second area (58) between the second electrodes (62) and the second connection element (39). Battery cell (20) according to one of the preceding claims, in which the housing (30) has a first cover element (71), which first cover element (71) forms the first housing wall (41) and the first connection element (38) at least in sections. Battery cell (20) according to one of the preceding claims, in which the housing (30) has a second cover element (72), which second cover element (72) forms the second housing wall (42) and the second connection element (38) at least in sections. Battery cell (20) according to one of the preceding claims, in which the first electrodes (61) have a maximum first electrode width (65) transversely to the first longitudinal direction between the first housing side (33) and the second housing side (34), and in which the first Strip elements (55) between the associated first electrode (61) and the first connection element (38) have a minimum strip element width (66) which is at least 40% of the maximum first electrode width (65), preferably at least 50%, more preferably at least 60% , more preferably at least 70%, more preferably at least 80%, more preferably at least 90% and more preferably at least 100%. Battery cell (20) according to one of the preceding claims, in which the first electrodes (61) have a maximum first electrode width (65) transversely to the first longitudinal direction between the first housing side (33) and the second housing side (34), and in which - the first connection element (38), - the second connection element (39), or - the first connection element (38) and the second connection element (39) have a maximum connection element width (67), which maximum connection element width is at least 40% of the first electrode width (65), preferably at least 50%, more preferably at least 60%, more preferably at least 70%, more preferably at least 80%, more preferably at least 90% and more preferably at least 100%. Battery cell (20) according to one of the preceding claims, in which the housing (30) - on the first side of the housing (33), - on the second side of the housing (34), or - On the first housing side (33) and on the second housing side (34) has a vent valve (40) in order to allow degassing from the battery cell (20) in the event of excess pressure. Battery cell (20) according to one of the preceding claims, in which the first electrode arrangements (51) each have a first foil (53) which is electrically conductive, which forms the first strip element (55) and which extends into a third region of the first electrode (61), at least one first active material layer (54) being provided on the first film (53) in the third region. Battery cell (20) according to one of the preceding claims, in which a first sealing element (45) is provided between the first connection element (38) and the first housing wall (41), and in which a second sealing element (46) between the second connection element (39 ) and the second housing wall (42) is provided, which first sealing element (45) and which second sealing element (46) are provided to prevent the passage of an electrolyte between the respective connection element (38, 39) and the associated housing wall (41, 42) to prevent.

Images