EP3833893A1

EP3833893A1 - Sealing element

Info

Publication number: EP3833893A1
Application number: EP19753000.9A
Authority: EP
Inventors: Gilles Desmond Fomen
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2018-08-07
Filing date: 2019-08-06
Publication date: 2021-06-16
Also published as: WO2020030614A1; DE102018213211A1; CN112805492A; CN112805492B

Abstract

The invention relates to a sealing element (14) for sealing a battery cover (10) for a battery housing (26), having at least one deformable sealing lip (18, 20) extending in a radial direction. The radial extent (22) thereof relative to a contact face (28) exceeds a distance (32) from same by a protrusion (24). At least one radially extending rib (54, 56) is moulded on the at least one deformable sealing lip (18, 20).

Description

sealing element

The invention relates to a sealing element for sealing a

Battery cover of a battery case and the use of the

Sealing element on a battery, a LEM battery in general and a LeM48 V battery in particular.

State of the art

WO 2015/135541 Al relates to a seal for a hydraulic piston-cylinder arrangement. A seal is disclosed which is constructed in such a way that it is essentially U-shaped or V-shaped in the sealing direction and press sealing lips against the respective sealing surface to be sealed. The sealing lips move in a lever-like continuation against the respective sealing surface. There are elastomer seals made of silicone, EPDM or HMBR called, which are pre-stressed by their geometry in the installed state. Furthermore, a

Provided clamping element which has a static sealing lip. A sealing element has a base body with a sealing lip, a sealing contour having an extension being provided. For the fastening of the prestressing element to the sealing element, a protuberance is formed on the prestressing element. The prestressing element can be represented by one or more plastic components.

DE 10 2009 005 775 Al relates to a bearing sealing arrangement. This comprises a sealing ring and a race with at least one axially directed running surface, at least one first sealing lip being formed on the sealing ring for bearing against the axially directed running surface. The sealing ring has an arcuate extension, on the free end of which the first sealing lip is formed. By forming the first sealing lip, a contact force of the sealing lip can be metered well even with a comparatively stiff sealing material. DE 10 2009 022 109 Al has a rotating union with a smaller one

Gas permeability to the object. The rotating union comprises a sealing device. The sealing device has a lamellar seal, the lamellas sealingly abutting the circumferential surface of a shaft and being compressible in the axial direction. Furthermore, the sealing device as

Radial shaft seal can be equipped with a metallic sealing lip, which has a V-shaped profile within the contact area.

Presentation of the invention

According to the invention, a sealing element for sealing a battery cover for a battery is proposed, with at least one deformable sealing lip which extends in the radial direction and whose radial extent to a contact surface exceeds a distance from the contact surface by a protrusion. At least one radially extending rib is formed on the at least one deformable sealing lip.

The solution proposed according to the invention provides a sealing element which, as a static sealing element in large series production, compensates for larger component tolerances and maintains a largely constant maximum contact pressure at the sealing point.

In a development of the solution proposed according to the invention, the at least one rib is formed on the side of the at least one sealing lip which, in the deformed state, assigns to the contact surface.

This contact area is in particular an inside of a housing of a battery.

In a development of the solution proposed according to the invention, the at least one rib on the at least one sealing lip is circumferential.

The sealing element proposed according to the invention comprises at least one rib, which can be designed in different geometries. For example, the at least one rib can be designed in a semicircle geometry such that the semicircle of the contact surface on which the seal is to be produced is opposite. On the other hand, the at least one rib can also have a square or triangular geometry, in the case of the triangle geometry the at least one rib has a tapered angular end.

If the at least one rib is designed in a semicircular geometry or in a quadrilateral or triangular geometry, a point contact can be achieved on the contact surface to be sealed or, if a semicircular geometry is used, a spherical contact can be achieved.

In point contact between the at least one rib and the contact surface, there is a maximum contact pressure of the contact pressure p between the contact surface and the sealing element. With the solution proposed according to the invention, this maximum pressure can be maintained even with further deformation of the sealing element proposed according to the invention, and as long as the point contact between the at least one rib and the contact surface prevails. If, for example, a plurality of sealing lips are formed on the sealing element and have a radial extension, a stronger one can be used

Deformation of a first sealing lip, on which a rib is formed, seen in the installation direction, this subsequent sealing elements, on which a rib is formed, take over the point contact with the contact surface. The solution proposed according to the invention can thus achieve redundancy with regard to the sealing partners acting in each case.

The invention also relates to the use of the

Sealing element on a battery, the housing of which is sealed with a battery cover.

The invention further relates to the use of the sealing element on a LeM48 V battery, [Lern Light Electrical Mobility].

Advantages of the invention

As already mentioned above, the sealing element proposed according to the invention can, in large-scale production, tolerances that usually occur between the individual components, i.e. between battery cases and

Compensate the battery covers. In addition, that according to the invention proposed solution can also compensate for deviations in the mounting devices. By the

Sealing element proposed according to the invention can be at high

Pressings, which can result from the component assembly tolerances, avoid steep drops in the maximum contact pressure.

The solution proposed according to the invention maintains a constant maximum contact pressure between the sealing element and the contact surface: at the same time, larger manufacturing tolerances can be compensated for. There is a cost advantage through a coarser dimensioned component design and assembly design. Depending on the number of ribs that can be formed on the sealing element proposed according to the invention or on the sealing lips thereof, multiple redundancy can be achieved.

The sealing element proposed according to the invention generally offers an improvement in the robustness of static ones acting in the radial direction

Lamellar seals compared to solutions according to the prior art.

Another advantage of the solution proposed according to the invention can be seen in the fact that when a battery is opened, the sealing element is a safety element when battery cells are degassed. There is one

Optimal to find between a minimum opening pressure that from

Safety reasons must be observed, and a maximum contact pressure to maintain the sealing effect. The invention

The proposed solution ensures a compromise on the safety requirement of maintaining a minimum opening pressure on the one hand and on the other hand a functioning requirement with regard to the maximum contact pressure for producing a high-quality contact pressure.

Brief description of the drawings

The invention is explained in more detail below with the aid of the drawing

described.

It shows: Figure 1 A recorded on a component to be sealed

Sealing element and a component, for example a housing on which a battery cover is to be mounted,

FIG. 2 shows the qualitative course of a maximum contact pressure at a sealing point,

FIG. 2.1 a first deflection of a sealing lip,

FIG. 2.2 shows a second deflection of a sealing lip,

Figure 3 shows the qualitative course of the maximum contact pressure p

FIG. 3.1 shows a sealing lip contour with a first rib and a second indicated rib,

FIG. 4 shows a battery housing,

FIG. 4.1 shows a longitudinal section through the battery housing according to FIG. 4,

Figure 4.2 shows a detailed representation of the sealing element between

Battery case and cover and

Figure 5 is a plan view of the battery case.

variants

The illustration according to FIG. 1 shows that a battery cover 10 is provided with a sealing element 14. The sealing element 14 is on a

Contact surface 12 of the battery cover 10 applied and procured as an LSR seal 16. The sealing element 14 comprises a first sealing lip 18 and a second sealing lip 20. The two sealing lips 18 and 20 run according to a radial extension 22 in the radial direction with respect to the contact surface 12.

Below the sealing element 14 there is a battery housing 26 which on its side facing the sealing element 14 or its sealing lips 18, 20 Side, has a contact surface 28. The sealing element 14 shown in FIG. 1 is mounted in the mounting direction 30, ie inserted into the battery housing 26, so that the two extend in the radial direction

Sealing lips 18 and 20 experience a deformation, since these are elastically deformable. The radial extent 22 of the two sealing lips 18, 20 is dimensioned such that they each have an overhang 24 which is a distance 32 between the sealing element 14 and the contact surface 28 of the

Battery housing exceeds 26.

A qualitative course of the contact pressure of the sealing element 14 is plotted in FIGS. 2, 2.1 and 2.2, in each case compared to the degree of deformation of one of the sealing lips 18, 20.

It can be seen from the illustration in FIG. 2 that when the

Sealing element 14 as shown in FIG. 1 in the mounting direction 30, for example the first sealing lip 18 undergoes a deformation as shown in FIG. 2.1. 2.1, the first sealing lip 18 experiences a first deflection 48. In the first deflection 48, there is a point 44 between the tip of the first sealing lip 18 and the contact surface 28 of the battery housing 26, which extends essentially in the vertical direction. The state of deformation 42 of the first sealing lip 18 shown in FIG. 2.1 corresponds to a contact pressure maximum 38, which the contact pressure curve 36, plotted over the projection 24, reaches.

As can further be seen from the course of the contact pressure p, further deformation of the first sealing lip 18, as shown in FIG. 2.2, leads to a sharp drop in contact pressure 64, which is characterized by a contact pressure minimum 40 in FIG. 2, and which in FIG Figure 2.2 shown

Deformation state of the first sealing lip 18 corresponds. As can be seen from FIG. 2.2, the first sealing lip 18 is in a deformation state 42, which corresponds to a second deflection 50. In the state shown in FIG. 2.2, there is a flat contact 46 on the outside 68 of the first sealing lip 18 on the contact surface 28 of the battery housing 26 to be sealed. FIG. 2 shows that there is between the contact pressure maximum 38, cf. first deflection 48 of the first sealing lip 18 and that shown in FIG. 2.2 State of the second deflection 50 of the first sealing lip 18 leads to a strong drop in contact pressure 64. This deteriorates the quality of the sealing function.

FIGS. 3 and 3.1 show how the contact pressure p runs between the sealing element 14 and the contact surface 28 of the battery housing 26 to be sealed.

As can be seen from FIG. 3.1, in this illustration the first sealing lip 18 is provided with a sealing lip contour 52 which has either a first rib 54 or a first and a second rib 54, 56. The first rib 54 and

optionally the second rib 56 are located on the outside 68 of the first sealing lip 18, while an inside 66 of the first sealing lip 18 is free of contours. In the illustration according to FIG. 3.1, the first rib 54, which is located on the outside 68 of the first sealing lip 18, lies in point contact 70 against the contact surface 28 of the battery housing 26 to be sealed. In this state, the contact pressure maximum 38 of the contact pressure p is set in accordance with the diagram. In the case of the sealing lip contour 52 shown in FIG. 3.1, the contact pressure maximum 38 is also at further deformation, i.e.

Deflection of the first sealing lip 18 is maintained, since even with further deformation of the first sealing lip 18 between the first rib 54 and the substantially vertical direction of the contact surface 28 of the battery housing 26 to be sealed, the point contact 70 between the first rib 54 and the contact surface 28 is maintained preserved.

This means that the solution proposed according to the invention

Contact pressure maximum 38 is maintained even with further deformation of the first sealing lip 18, since the point contact 70 is maintained.

In a modification of the geometry of the first rib 54 or the second rib 56 shown in FIG. 3.1, the ribs 54, 56 can also have a rectangular geometry 60 or a triangle geometry 62 or - as shown - a semicircular geometry 58 be executed. In the case of the formation of the semicircular geometry 58 on the first rib 54, the point system 70 is created, in the case of the triangle geometry 62 of the first rib 54, the point system 70 is also created. If the first rib 54 or the second rib 56 is in a rectangular geometry 60 molded on, a sealing surface 74 is formed, which, however, has a significantly smaller vertical extent compared to the illustration according to FIG. 2.2.

If a plurality of sealing lips 18, 20 are implemented on the sealing element 14, redundancy with regard to the maintenance of the contact pressure maximum 38 can be achieved by several sealing lips 18, 20 reaching the contact surface 28 of the battery housing 26 to be sealed in point contact 70. This shifts the location of the seal, but it stays that way

Maintain contact pressure maximum 38 at all times.

Depending on the size of the component tolerances that are to be sealed against each other, the sealing element 14 proposed according to the invention can maintain a contact pressure p that enables sealing, which is in the vicinity of the contact pressure maximum 38.

The solution proposed according to the invention provides an essentially constant maximum contact pressure p, which is also greater

Component tolerances can be maintained seen. Through the

The solution proposed according to the invention results in a cost advantage through coarser component and assembly tool design. Corresponding to the number of ribs 54, 56 of whatever geometry, which is on the outside 68 of the

If sealing lips 18, 20 are formed, redundancy can be set, so that the contact pressure maximum 38 is maintained at all times. The sealing element 14 proposed according to the invention is considerably improved in terms of its robustness as a statically radially acting lamellar seal.

FIG. 4 shows a battery housing 26, which is shown here by way of example for a LeM48 V battery and by means of the device according to the invention

proposed sealing element 14 is sealed. 4.1 shows a longitudinal section 80 through the battery housing 26 as shown in Figure 4. Figure 4.2 shows an enlarged view of an LSR seal 16, which is between the battery housing 26 and one on the underside of the

Battery cover 10 trained contact surface 78 is arranged. 4.2 also shows the first and second sealing lips 18, 20 of the

To remove sealing element 14. Through the sealing element 14, which on the the sealing lips 18, 20 side facing away from the contact surface 78 of the underside of the battery cover 10, the battery housing 26 is sealed. The sealing element 14 lies against a circumferential cover shoulder 76. 5 shows a plan view of the battery housing

26 out. As can be seen from the top view according to FIG. 5, the sealing element 14 is designed as a circumferential LSR seal 16. Figure 5 shows that the LSR seal 16 on an inside, i.e. the contact surface 28 of the

Battery housing 26 rests sealingly. The battery housing 26 has a housing contour 82 which is essentially rectangular, but also comprises oval sections, in particular on the long side. The first and second sealing lips 18 (not shown in FIG. 5) with the ribs 54 and 56 formed therein lie on the inside of the battery housing 26 in a sealing manner on the contact surface 28.

The invention is not restricted to the exemplary embodiments described here and the aspects emphasized therein. Rather, a large number of modifications are possible within the scope specified by the claims, which lie within the framework of professional action.

Claims

Expectations

1. Sealing element (14) for sealing a battery cover (10)

Battery housing (26), with at least one deformable sealing lip (18, 20) extending in the radial direction, the radial one

Extension (22) to a contact surface (28), a distance (32) to this by a projection (24), characterized in that on the at least one deformable sealing lip (18, 20) at least one radially extending rib (54, 56) is integrally formed.

2. Sealing element (14) according to claim 1, characterized in that the at least one rib (54, 56) is formed on the side of the at least one sealing lip (18, 20) which in the deformed state (42) assigns to the contact surface (28).

3. Sealing element (14) according to claim 1, characterized in that the contact surface (28) is an inside of a battery housing (26) of a battery.

4. Sealing element (14) according to claim 1, characterized in that the at least one rib (54, 56) on the at least one sealing lip (18, 20) is circumferential.

5. Sealing element (14) according to claim 1, characterized in that the at least one rib (54, 56) is designed in a semicircular geometry (58).

6. Sealing element (14) according to claim 1, characterized in that the at least one rib (54, 56) is designed in a triangular geometry (62).

7. Sealing element (14) according to claims 5 or 6, characterized

characterized in that the at least one rib (18, 20) in semicircular geometry (58) or the at least one rib (18, 20) in triangular geometry (62) in spherical arrangement (72) or in point arrangement (44, 70) abuts the contact surface (28).

8. Sealing element (14) according to claim 1, characterized in that in point contact (44, 70) of the at least one rib (54, 56) on the contact surface (28) a contact pressure maximum (38) of the contact pressure p between the contact surface (28) and the sealing element (14) prevails.

9. Sealing element (14) according to claim 8, characterized in that the contact pressure maximum (38) of the contact pressure p im

The state of deformation (42) of the deformable sealing lips (18, 20) is maintained as long as there is a point contact (44, 70) between the at least one rib (54, 56) and the contact surface (28).

10. Use of the sealing element (14) according to any one of claims 1-9 and a battery, the battery housing (26) with a battery cover (10) is sealed.

11. Use of the sealing element (14) according to one of claims 1-9 on a LeM48 V battery (LeM: Light Electrical Mobility).