Battery cell cover and battery cell

Abstract

The present invention relates to a cover (1) for a battery cell (2), comprising a base plate (3) with a first side (4) and a second side (5), an insulating plate (6) arranged on the first side (4) of the base plate (3) and positively connected to the base plate (3), and a frame (7) arranged on the second side (4) of the base plate (3) and positively connected to the base plate (3), wherein the base plate (3) has a material recess (8) and a material protrusion (9) produced by the material recess (8), which cooperate to positively secure the insulating plate (6) and the frame (7). The invention also relates to a battery cell (2) with the cover (1).

Description

[0001] The invention relates to a cover for a battery cell, comprising a base plate with a first side and a second side, an insulating plate arranged on the first side of the base plate and positively connected to the base plate, and a frame arranged on the second side of the base plate and positively connected to the base plate. The invention also relates to a battery cell with such a cover.

[0002] From CN 115295933 A, a prismatic battery cell with an essentially cuboid cell housing is already known, which has a housing tank open on one side and a lid welded to the housing tank to close the housing tank opening.

[0003] Such covers are typically constructed in multiple parts and feature a frame (on the inside of the battery) and an insulating plate (on the outside of the battery), with the frame and the insulating plate connected to each other via a base plate. To secure the adjacent components to one another, particularly against rotation or to ensure correct installation, known covers have one or more, for example, circular blind holes on both sides – i.e., on one side facing the insulating plate and on the opposite side facing the frame – into which the respective adjacent component (i.e., the frame or the insulating plate) engages / extends with a correspondingly shaped projection to achieve the anti-rotation or anti-installation function.

[0004] However, the current state of the art always has the disadvantage that such blind holes are usually produced by machining, which is costly and cannot be easily integrated into all manufacturing processes.

[0005] The object of the invention is therefore to avoid or at least reduce the disadvantages of the prior art. In particular, a cover for a battery cell and a battery cell with the cover are to be provided, whereby a reliable locking mechanism between the individual components of the cover is ensured and a cost-effective and simple manufacturing of the locking mechanism is possible.

[0006] The object of the invention is achieved by a lid having the features of claim 1. Furthermore, the object of the invention is achieved by a battery cell having the features of the dependent claim. Advantageous embodiments are the subject of the dependent claims.

[0007] The invention relates to a cover for a battery cell. The battery cell is intended for use in a vehicle, for example as a power source.

[0008] The cover has a base plate with a first side and a second side. The first side and the second side are opposite sides of the base plate (in the direction of plate thickness). In the installed state, the first side of the base plate faces, in particular, the outside of a battery cell, and the second side of the base plate faces, in particular, the inside of a battery cell. The base plate can, for example, have a substantially rectangular cross-section. The cover can, for example, be made of a metal, such as aluminum or steel, in particular stainless steel or steel with a coating. The cover components, such as the base plate, can accordingly be made of a metal, such as aluminum or steel, in particular stainless steel or steel with a coating.

[0009] The cover has an insulating plate arranged on the first side of the base plate and positively connected / secured to the base plate. The insulating plate can preferably be arranged directly on the first side of the base plate. The insulating plate can have a circumferential edge projecting away from the base plate. The insulating plate can, for example, be made of a plastic. The insulating plate can, for example, have a substantially rectangular cross-section. The insulating plate can, in particular, have a smaller cross-section than the base plate. The insulating plate can, for example, be arranged substantially centrally on the base plate.

[0010] The lid has a frame arranged on the second side of the base plate and positively connected / secured to the base plate. The frame can preferably be arranged directly on the second side of the base plate.

[0011] According to a central aspect of the invention, the base plate has a material recess, in particular in the form of a blind hole, and a material protrusion produced by the introduction of the material recess, which interact to provide a positive locking connection with the insulation panel and the frame. That is to say, the material recess forms a first positive locking geometry that interacts with a first counter-positive locking geometry on the frame (or alternatively on the insulation panel), and the material protrusion forms a second positive locking geometry that interacts with a second counter-positive locking geometry on the insulation panel (or alternatively on the frame).

[0012] This has the advantage that the two positive-locking geometries on the base plate can be manufactured particularly easily and cost-effectively because the material protrusion is created automatically when the material recess is formed. Therefore, two separate manufacturing steps are not required.

[0013] According to a preferred embodiment, the base plate can have two (or more, such as three, four, five, six, etc.) material cutouts. Preferably, the corresponding interlocking partner, i.e., the frame or the insulation plate, can have a number of first interlocking geometries equal to or less than the number of material cutouts. That is to say, the number of first interlocking geometries interacts with all or only some of the material cutouts.

[0014] According to a preferred embodiment, the base plate can have two (or more, such as three, four, five, six, etc.) material protrusions. Preferably, the corresponding interlocking partner, i.e., the frame or the insulation plate, can have a number of protrusions equal to or less than the number of material protrusions. Preferably, the corresponding interlocking partner, i.e., the frame or the insulation plate, can have a number of secondary interlocking geometries equal to or less than the number of material protrusions. That is to say, the number of secondary interlocking geometries interacts with all or only some of the material protrusions.

[0015] According to a preferred embodiment, the material release and the material elevation can be essentially the same with respect to their cross-sectional shape, cross-sectional size and / or height.

[0016] According to a preferred embodiment, the material release and the material raising can be arranged at positions directly opposite each other in the direction of the base plate thickness.

[0017] According to a preferred embodiment, the material clearance and the material lifting can be produced by a single forming step. This means that the material clearance and / or the material lifting are not produced in a machining step, resulting in significantly more cost-effective manufacturing.

[0018] According to a preferred embodiment, the material relief can be produced by embossing. In this preferred embodiment, a material protrusion resulting from the embossing can form the material elevation. This means that the material protrusion does not need to be removed by post-processing, but is used, in particular, to positively secure the insulation panel (or alternatively the frame) to the base plate.

[0019] According to a preferred embodiment, the material protrusion can form a circumferential flank against which the insulation plate is secured for positive locking and rotation prevention, or against which it abuts in the rotated state. This means that the flank or side surface of the material protrusion serves as the circumferential (and not the end face) contact surface for the insulation plate. The flank and the insulation plate can have some play relative to each other, for example, for ease of assembly. This means that the insulation plate does not have to / cannot directly contact the flank, but is positioned close enough to the flank that the insulation plate is not freely rotatable. Accordingly, movement of the insulation plate in a direction perpendicular to the flank is limited by the flank. Thus, depending on the positioning and design of the material protrusion and the insulation plate, a certain degree of movement of the insulation plate can be eliminated.

[0020] According to an alternative embodiment, the material protrusion could be inserted into a suitably designed (blind) hole or through-hole in the insulation panel (or alternatively in the frame) to provide a positive locking mechanism to prevent rotation. However, this requires a sufficient thickness of the insulation panel.

[0021] Preferably, the insulation plate can be arranged between the two (or more) material protrusions. Preferably, a circumferential surface of the insulation plate, particularly on opposite sides of the insulation plate, can be secured to the flank of each of the two material protrusions. Alternatively or additionally, a circumferential surface of the insulation plate, particularly on opposite sides of the insulation plate, can at least partially and flush enclose the flanks of each of the two material protrusions.

[0022] According to a further development of the preferred embodiment, the material protrusion can have an oblong or circular cross-section. This allows for a particularly simple forming or embossing geometry.

[0023] According to a preferred embodiment, the frame (or alternatively the insulation plate) can have a projection that extends into the material recess. The projection can have a geometry corresponding to the material recess, in particular being essentially the same or complementary to the material recess with respect to its cross-sectional shape, cross-sectional size, and / or height. This ensures a precise fit between the frame and the base plate.

[0024] According to a preferred embodiment, the cover can have a through-hole extending through the insulation plate, the base plate, and the frame. The through-hole can, for example, serve to accommodate a membrane or a closure component, or as access to the interior of a battery cell.

[0025] The present invention also relates to a battery cell, comprising a cell housing (also referred to as a cell cup) and a described lid. The battery cell can be prismatic.

[0026] According to a preferred embodiment, the cell casing can be essentially cuboid in shape. Other geometries are also conceivable.

[0027] According to a preferred embodiment, the cell housing can have an opening on or in a side surface which is closed or can be closed by the lid.

[0028] In other words, the invention relates to the dual use of an embossed feature as an anti-rotation device for components of a battery cover, wherein a double-sided anti-rotation device is provided by creating a recess on one side (in particular produced by an embossing process) and using the resulting raised area of ​​material on the other side as a locking mechanism (positive locking). Preferably, the anti-rotation device can be produced by forming, but the invention is also conceivable using other methods, such as machining. The cover has a base plate. The base plate is, in particular, a component made of metal, for example, aluminum or steel, such as stainless steel or a steel with a coating, which is produced, for example, by material forming, such as stamping and / or embossing.The base plate has one or more material recesses, produced in particular by embossing, into which a material protrusion of an adjacent component, such as a frame of the lid, can be inserted to secure the base plate and the adjacent component against rotation relative to each other. For example, two recesses and corresponding two protrusions can be formed. Other numbers are also conceivable. The recesses are positioned so that the resulting material protrusions of the base plate can be used to secure another component, such as an insulation panel of the lid. Preferably, the embossings / protrusions can be elongated to secure the other component or the insulation panel on two opposing surfaces. Alternatively, the embossings / protrusions can be circular, so that the resulting protrusion is also circular.The surfaces of the additional component or insulation plate are adapted to the geometry of the embossing or protrusions. For example, the additional component or insulation plate can also have a recess into which the protrusion of the base plate is inserted or through which the protrusion of the base plate extends. Combinations of the described embodiments are also possible. In particular, the anti-rotation features can be designed with straight or circular faces.

[0029] The invention is explained below with the aid of drawings. These show: Fig. 1, Fig. 2, Fig. 3 to Fig. Figure 4 shows a first embodiment of a lid or of components of the lid according to the present invention, Fig. 5, Fig. 6 to Fig. Figure 7 shows a second embodiment of the lid or of components of the lid, Fig. 8, Fig. 9 to Fig. Figure 10 shows a third embodiment of the lid or of components of the lid, Fig. Figure 11 shows a fourth embodiment of the lid or of components of the lid, and Fig. Figure 12 shows a schematic view of a battery cell with the lid according to the present invention.

[0030] The figures are purely schematic and serve to illustrate the invention. Identical elements are marked with the same reference symbols.

[0031] Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9 to Fig. Figure 10 shows different embodiments of a lid 1 according to the invention. The lid 1 serves to close a cell housing / cell cup 23 of a battery cell 2 (see Figure 10). Fig. 12). Battery cell 2 is intended in particular for use in a vehicle, for example as a power source.

[0032] The cover 1 has a base plate 3. The base plate 3 has a first side 4 and a second side 5. The first side 4 and the second side 5 are opposite sides of the base plate 3 (in the direction of the plate thickness). In the installed state (see...) Fig. 12) The first side 4 of the base plate 3 is oriented, in particular, towards the outside of a battery cell, and the second side 5 of the base plate 3 is oriented, in particular, towards the inside of a battery cell. The base plate 3 can, for example, have a substantially rectangular cross-section.

[0033] The cover 1 has an insulating plate 6 arranged on the first side 4 of the base plate 3 and positively connected / secured to the base plate 3. The insulating plate 6 can preferably be arranged directly on the first side 4 of the base plate 3 or abut the first side 4 of the base plate 3.

[0034] The cover 1 has a frame 7 arranged on the second side 5 of the base plate 3 and positively connected / secured to the base plate 3. The frame 7 can preferably be arranged directly on the second side 5 of the base plate 3 or abut the second side 5 of the base plate 3.

[0035] According to a central aspect of the invention, the base plate 3 has a material recess 8 and a material protrusion 9 produced by the introduction of the material recess 8. The material recess 8 is specifically designed in the form of a blind hole, i.e., not as a through hole in the plate thickness direction. The material recess 8 and the material protrusion 9 interact to provide a positive locking connection with the insulation plate 6 and the frame 7. That is, the material recess 8 forms a first positive locking geometry that interacts with a first counter-positive locking geometry 10 on the frame 7 (or alternatively on the insulation plate 6), and the material protrusion 9 forms a second positive locking geometry that interacts with a second counter-positive locking geometry 11 on the insulation plate 6 (or alternatively on the frame 7).

[0036] In the Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9 to Fig. In the first, second, and third embodiments shown in Figure 10, the material recess 8 interacts with the frame 7, and the material protrusion 9 interacts with the insulation plate 6. This means that the material recess 8 is arranged on the inside of the base plate 3, and the material protrusion 9 is formed on the outside of the base plate 3. In the embodiment shown in Fig. In the fourth embodiment shown in Figure 11, the material recess 8 interacts with the insulation plate 6 and the material protrusion 9 interacts with the frame 7. This means that the material recess 8 is arranged on the outside of the base plate 3 and the material protrusion 9 is formed on the inside of the base plate 3.

[0037] In particular, the material cutout 8 and the material protrusion 9 can be essentially identical with respect to their cross-sectional shape, cross-sectional size and / or height. Specifically, the material cutout 8 and the material protrusion 9 can be arranged at positions directly opposite each other in the (base) plate thickness direction.

[0038] Preferably, the material relief 8 and the material protrusion 9 can be produced by a single forming step. Particularly preferably, the material relief 8 can be produced by embossing. In this case, a material protrusion resulting from the embossing can form the material protrusion 9.

[0039] The insulation plate 6 can have a circumferential edge 12 projecting away from the base plate 3 (see below). Fig. 1) The cover 1 can have a further substantially plate-shaped component 13, which can preferably be accommodated within the rim 12. The insulating plate 6 can, for example, be made of a plastic. The insulating plate 6 can, for example, have a substantially rectangular cross-section. The insulating plate 6 can, in particular, have a smaller cross-section than the base plate 3. The insulating plate 6 can, for example, be arranged substantially centrally on the base plate 3.

[0040] Preferably, the material protrusion 9 can form a flank 14 on its circumference, against which the insulation plate 6 rests for positive locking and anti-rotation protection. This means that the flank 14, or side surface, of the material protrusion 9 serves as a circumferential (and not end-face) contact surface / boundary surface for the insulation plate 6. In the first preferred embodiment, the material protrusion 9 (and correspondingly the material recess 8) is designed as an elongated hole, with a straight side surface of the material protrusion 9 forming the (straight) flank 14.

[0041] Preferably, the base plate 3 can have two (or more) of the material protrusions 9. Preferably, the insulation plate 6 can be arranged between the two (or more) of the material protrusions 9. Preferably, a circumferential surface 15 of the insulation plate 6, particularly on opposite sides of the insulation plate 6, can abut the flank 14 of each of the two material protrusions 9. This means that the circumferential surface 15 forms the second counter-locking geometry 11.

[0042] Preferably, the frame 7 can have a projection 16 that extends into the material recess 8. This means that the projection 16 forms the first positive-lock geometry 10. The projection 16 can have a geometry corresponding to the material recess 8, in particular being essentially the same or complementary to the material recess 8 with regard to its cross-sectional shape, cross-sectional size and / or height.

[0043] Furthermore, the frame 7 can have an inner circumferential contact surface 17 arranged on the side facing away from the base plate 3. The contact surface 17 can, for example, be formed by a second projection 18 (see figure). Fig. 1 and Fig. 4) or by deepening 19 (cf. Fig. 6, Fig. 7, Fig. 8 and Fig. 10) be trained.

[0044] In the second and third preferred embodiments, the material protrusion 9 (and correspondingly the material recess 8) is circular, with a curved side surface of the material protrusion 9 forming the (convexly curved) flank 14. Accordingly, the insulation plate 6 has a (convexly curved) circumferential side surface 20 as a second counter-fit geometry 11 (for each material protrusion 9). In particular, the insulation plate 6 has two circumferential side surfaces 20 arranged on opposite sides of the insulation plate 6. The side surfaces 20 can completely (flush / adhere) enclose the flanks 14 of each of the material protrusions 9 (see Figure 1). Fig. 5, Fig. 6 to Fig. 7) or at least partially enclose (flush / adjacent) (see Fig. 8, Fig. 9 to Fig. 10).

[0045] Furthermore, the cover 1 can have a through-hole 21 extending through the insulation plate 6, the base plate 3, and the frame 7. This through-hole can, for example, serve to accommodate a membrane or a closure component 22, or as access to the interior of a battery cell.

[0046] Fig. Figure 12 shows a schematic view of the battery cell 2. The battery cell 2 can be prismatic. The battery cell 2 has a cell housing 23 and a cover 1. Preferably, the cell housing 23 can be substantially cuboid in shape. In particular, the cell housing 23 can have an opening on or in one side surface, which is closed or closable by the cover 1. Reference symbol list 1 lid 2 battery cells 3 Base plate 4 first page 5 second page 6 Insulation board 7 frames 8 Material exemption 9. Material Collection 10 first counter-progression geometry 11 second counter-progression geometry 12 Rand 13 further components 14th flank 15 circumferential area 16 lead 17 Plant area 18 second lead 19 In-depth study 20 circumferential area 21 Through hole 22 Locking component 23 cell casings QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] CN 115295933 A

[0002]

Claims

Cover (1) for a battery cell (2), comprising a base plate (3) with a first side (4) and a second side (5), an insulating plate (6) arranged on the first side (4) of the base plate (3) and positively connected to the base plate (3), and a frame (7) arranged on the second side (4) of the base plate (3) and positively connected to the base plate (3), characterized in that the base plate (3) has a material recess (8) and a material protrusion (9) produced by introducing the material recess (8), which cooperate to positively secure the insulating plate (6) and the frame (7). Cover (1) according to claim 1, characterized in that the material release (8) and the material protrusion (9) are essentially identical in terms of their cross-sectional shape, cross-sectional size and / or height and are arranged at positions directly opposite each other in the direction of the base plate thickness. Lid (1) according to claim 1 or 2, characterized in that the material release (8) and the material raising (9) are produced by a common forming step. Lid (1) according to one of claims 1 to 3, characterized in that the material release (8) is produced by embossing and a material protrusion resulting from the embossing forms the material elevation (9). Lid (1) according to one of claims 1 to 4, characterized in that the material protrusion (9) forms a flank (14) on its circumferential side, on which the insulating plate (6) is secured for positive locking to prevent rotation. Lid (1) according to claim 5, characterized in that the base plate (3) has two of the material protrusions (9) between which the insulation plate (6) is arranged, wherein a circumferential surface (15, 20) of the insulation plate (6) is secured to the flank (14) of each of the two material protrusions (9) and / or the flank (14) of each of the two material protrusions (9) is at least partially flush enclosed. Lid (1) according to claim 5 or 6, characterized in that the material relief (8) and / or the material protrusion (9) are / are formed in cross-section in an elongated or circular shape. Lid (1) according to one of claims 1 to 7, characterized in that the frame (7) has a projection (16) which extends into the material recess (8). Lid (1) according to one of claims 1 to 8, characterized in that the lid (1) has a through hole (21) formed through the insulation plate (6), the base plate (3), and the frame (7). Battery cell (2), comprising a cell housing (23) and a lid (1) according to any one of claims 1 to 9, wherein the cell housing (23) is substantially cuboid in shape, has an opening on one side surface which is closed or can be closed by the lid (1).

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