Pressure compensation device

Abstract

The invention relates to a pressure compensation device (20) for compensating for an internal pressure in a receiving housing, in particular a battery housing, of an electrochemical or electronic device, having a housing (20.3) which has at least one ventilation opening (20.4) which forms a gas-permeable connection between an inner side (20.1) and an outer side (20.2) of the housing (20.3), the ventilation opening (20.4) is blocked by means of a gas-permeable or gas-tight membrane (40), and wherein a rupture element (30) is assigned to the membrane (40), which rupture element is designed and positioned in such a way that, when the membrane (40) is deformed in the direction of the outer side (20.2), it is broken at least at one point under the action of the rupture element (30) in order to provide a flow connection from the inner side (20.1) to the outer side (21.1) via the ventilation opening (26.2). In order to enable a reproducible rupture behavior in such a pressure compensation device in a simple manner, it is provided according to the invention that the membrane (40) is connected, in particular integrally connected, to the rupture element (30) with its membrane inner side (42) facing the inner side (20.1) of the housing (20.3).

Description

Technical Field

[0001] The present invention relates to a pressure compensation device for compensating the internal pressure in a housing for an electrochemical or electronic device, the pressure compensation device being used in particular for a battery housing, the pressure compensation device comprising a housing having at least one ventilation hole, the ventilation hole forming a gas-permeable connection between the inner side and the outer side of the housing, wherein the ventilation hole is blocked, in particular at least partially covered, by means of a gas-permeable or gas-tight membrane, wherein a rupture element is assigned to the membrane, the rupture element being constructed and positioned such that when the membrane is deformed in the direction toward the outside, the membrane is destroyed at least at one location under the action of the rupture element, so as to provide a flow connection from the inside to the outside through the ventilation hole.

[0002] This pressure compensation device according to the invention serves to compensate for the internal pressure in a containment housing. In this case, it is possible to compensate for some pressure fluctuations between the interior of the containment housing and the environment via the membrane during normal operation when the membrane is designed to be gas-permeable. If a gas-impermeable membrane is used, additional measures must or can be provided to compensate for normal pressure fluctuations.

[0003] If the internal pressure in the interior of the housing on the inner side facing the pressure compensation device suddenly increases, this pressure must be immediately reduced in order to prevent the housing from rupturing. For this purpose, a rupture element is provided in the pressure compensation device according to the invention, which then destroys the membrane at at least one point. This can be achieved in the pressure compensation device according to the invention in that the membrane is severely deformed in the event of such an impermissible pressure increase, so that the membrane is destroyed, for example, cut open, at the rupture element. The internal pressure of the housing is then released via the release area through the ventilation opening in the direction of the outside of the pressure compensation device and thus in the direction of the environment. Background Art

[0004] A pressure compensation device is known from DE 10 2011 080 325 A1. The known pressure compensation device has a housing, which has a flange section with a hole for fixing on a battery housing. In this case, the housing covers the edge of the notch of the battery housing. The housing is connected to a membrane, which blocks the ventilation hole of the housing. In this case, the membrane is tensioned between the carrier element and the clamping member and maintains a circumferential seal. A housing-shaped protective element is also used, which has a cutting element in the central area. The cutting element is opposite to the membrane. The protective element is used to prevent contact with the membrane from the outside of the pressure compensation device. The protective element has a ventilation hole. The membrane is permeable, but basically hydrophobic. The hydrophobic function makes it impossible for water to reach the inner area from the environment or only inconspicuously from the outside. During normal operation, a gas balance between the environment and the battery housing can be achieved via the membrane. This is possible because the membrane is permeable. For example, if a sudden bursting pressure occurs due to a fault in the battery housing at this time, the membrane will bend outward. A spacing is provided between the cutting element and the outside of the membrane, which determines the permissible membrane deformation in this fault situation. If the membrane is arched beyond the permissible deformation, the membrane hits the cutting element, which is designed to be pointed. The cutting element damages the membrane, causing it to rupture. Gas can then quickly escape from the battery housing through the ventilation holes into the environment. This prevents the battery housing from exploding.

[0005] The pressure compensation devices known from the prior art are complex in design. Furthermore, due to the inevitable dimensional tolerances between the individual device components, it is not possible to ensure that the cutting element is always at exactly the same distance from the membrane surface in different pressure compensation devices of the same design. Therefore, in the event of an overload, an exactly reproducible rupture behavior cannot be achieved. Summary of the invention

[0006] It is therefore an object of the present invention to provide a pressure compensation device of the type mentioned at the outset, by means of which a reproducible rupture behavior is ensured.

[0007] This object is achieved in that the membrane is connected, in particular materially connected, with its inner side facing the inner side of the housing to the rupture element.

[0008] In the event of an overload, in the receiving space of the receiving housing and on the inner side of the membrane, an inadmissible pressure rises, and the membrane bends in the direction of the outer side of the housing. Since the membrane is connected to the rupture element with its inner side, the membrane cannot be deformed here or cannot be deformed to the same extent as the rest of the area covering the ventilation opening. The membrane therefore tears in the area of ​​the rupture element due to this different deformation state, so that the ventilation opening opens. The pressure can then be released from the receiving housing toward the outside.

[0009] In this way, a reproducible rupture behavior is ensured, since, as in the prior art, a tolerance-dependent spacing must not be created between the cutting tip and the outer side of the membrane, but the membrane is directly connected to the rupture element. Surprisingly, it has been found that the rupture behavior of the membrane is significantly improved, i.e. the membrane is coupled with its membrane inner side to the rupture element. In particular, this results in an improved response behavior in the event of an impermissible pressure increase.

[0010] According to the invention, the rupture element can form a main edge immediately adjacent to the connection with the membrane, at which the membrane tears or the membrane is severed here due to the pressure difference between the inside and outside of the housing. As soon as a crack or a cut occurs in the membrane, the membrane is weakened so that it tears and the vent suddenly opens.

[0011] Advantageously, the rupture element is arranged in such a way that it projects into the region of the ventilation opening and the connection, in particular the form-fit connection, to the membrane is arranged at least partially in the projecting part. Cracks can then form on the rupture element in the membrane region that is subject to large deformations. Furthermore, the rupture element resting against the inner side of the membrane supports the membrane against pressure effects from the outside. Such pressure effects can occur, for example, when water pressure generated by a cleaning device (hose, high-pressure sprayer) acts from the outside. This support reduces the risk of unintentional damage to the membrane in this operating position.

[0012] A preferred embodiment of the invention can be that the membrane has a circumference by which the membrane is circumferentially connected to the housing, so that the bursting element protrudes into the region of the ventilation opening and is connected, in particular materially connected, to the membrane in a region within the circumference.

[0013] Particularly preferably, the connection extends in the middle region of the membrane or at least partially in the middle region of the membrane.

[0014] A possible variant of the invention is that the membrane covers the vent with a surface area, wherein the surface area has a maximum free covering length and the rupture element extends into the region of the vent for at least 30% of the free covering length and / or the minimum length of the material connection in one direction extends for at least 25% of the free covering length. In this case, on the one hand, good inner support of the membrane is achieved and also good rupture behavior is achieved.

[0015] A possible variant of the invention also consists in that the ventilation opening is delimited by an annularly surrounding wall and that the bursting element projects radially inwards from the wall into the region of the ventilation opening.

[0016] According to a preferred variant of the invention, it can be provided that the rupture element has a connecting section, which has a connecting surface facing the membrane, to which the membrane is materially fixed, the connecting surface transitioning into an edge, in particular an edge, preferably a cutting edge, running transversely to the connecting surface, and preferably materially connected up to the edge, in particular the edge, preferably up to the cutting edge. This measure further improves the reproducible rupture behavior, since a defined positioning is provided for the crack formation at the edge, in particular the edge, in particular the cutting edge.

[0017] If it is provided that the housing has a cover section with a circumferential receptacle, the receptacle is preferably designed as a recess and surrounds the ventilation opening, and the membrane is placed on or inserted into the receptacle with its periphery and the connecting area of ​​the periphery is materially connected to the connecting section of the receptacle in a circumferential manner, then an exactly matched positioning of the membrane can be achieved in a simple manner.

[0018] In this case, it can also be provided that the membrane is injection molded with the housing in a plastic injection molding process. The connection and sealing between the membrane, the housing and the rupture element are accordingly integrated in the injection molding process. In this case, the membrane is materially connected to the housing, but it is also possible within the scope of the invention to connect the membrane to the finished housing, in particular materially connected.

[0019] It is particularly advantageous here if the connecting section of the rupture element, which is connected to the membrane material, transitions flush into the connecting section. The connection between the rupture element and the membrane and the housing and the rupture element is then established in one method step.

[0020] According to a variant of the invention, it can be provided that the housing carries a spacer in the region of its outer side, the spacer carrying a cover spaced apart from the membrane, the cover covering the membrane with a cover section spaced apart from the outer side of the membrane, the membrane being protected on its outer side against mechanical stresses.

[0021] Advantageously, it can also be provided that the spacer has at least one ventilation opening, which provides a spatial connection between the outer side of the membrane and the environment. Pressure equalization with the environment can be achieved via the ventilation opening. If the membrane is designed to be air-permeable, for example, pressure equalization between the inside and the outside can be achieved during normal operation via the membrane and the ventilation opening (breathing function).

[0022] Mechanical contact protection can be easily achieved if the spacer is at least partially designed as an annular body or has such an annular body, so that the annular body has an outer wall, which is spaced apart from the edge of the cover and at least one exhaust gas area in the form of a spacing space is formed between the edge and the outer wall.

[0023] For simple fixing of the cover section, it can be provided that the spacer has a fixing projection with a retaining element in the region on the outer side of the membrane and at a distance therefrom, so that the cover section is fixed to the spacer at the retaining element and the cover section is made of a flexible material. In the event of a rupture, the pressure in the gas flow deforms the cover section. As a result, a large opening cross section that was previously covered by the cover section is suddenly released.

[0024] In this case, a compact design is achieved in a simple manner if it is provided that the spacer has webs which hold the fastening projections on the outer side of the membrane and form the gas conducting region between the webs.

[0025] The object of the present invention is also achieved by a method for compensating the internal pressure in a housing of an electrochemical or electronic device, in particular a battery housing, using a pressure compensation device according to any one of technical solutions 1 to 12, wherein, in the event of an inadmissible pressure increase in the housing, the membrane is deformed in a direction away from the outside of the interior space of the housing, in particular arched, and the membrane is destroyed at least at one location under the action of a rupture element to provide a flow connection from the inside to the outside through the ventilation hole.

[0026] In the context of the invention, the membrane can be designed to be watertight or substantially watertight, and can in particular be designed as a surface element, in particular as a plastic film. The membrane can have a polyester material, such as polyethylene terephthalate or polycarbonate, or can also be composed entirely of such a material.

[0027] The membrane is preferably designed as a circular disk, thereby achieving advantageous properties when the membrane is deformed. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be described in detail below based on the embodiments shown in the accompanying drawings. It is shown in the drawings:

[0029] Figure 1 shows a perspective view of a protective device 10 from above,

[0030] Figure 2 Shown according to Figure 1 An exploded view of the protective device 10,

[0031] Figure 3 Shown according to Figure 1 The entire cross section of the protective device 10,

[0032] Figure 4 shows a perspective view of another protection device 10 according to the present invention, and

[0033] Figure 5 Shown according to Figure 4 Schematic diagram of the entire cross section. DETAILED DESCRIPTION

[0034] Figure 1 The protection device 10 and the pressure compensation device 20 are shown in a perspective view. The pressure compensation device 20 has a housing 20.3. The housing 20.3 forms an outer side 20.2 and an inner side 20.1.

[0035] When the housing 20.3 is conventionally designed as a receiving housing, in particular an electrochemical device or an electronic device, such as a battery housing, the inner side 20.1 corresponds to the interior of the receiving housing, while the outer side 20.2 corresponds to the environment facing away from the interior of the receiving housing.

[0036] like Figure 2 and Figure 3 As shown, the housing 20.3 forms a cover 21 in the region of the outer side 20.2. The cover ends at the top with a cover section 28 forming a cover surface. Opposite the cover section 28, the housing 20.3 has a sealing section on the cover 21.

[0037] The sealing section can be integrally formed on the housing 20 . 3 as an annular circumferential projection and preferably protrudes in the radial direction onto the outer side of the housing 20 . 3 .

[0038] The sealing section forms a mounting surface facing the inner side 20.1. Preferably, the mounting surface is configured as an annularly closed surface, which more preferably extends in the radial direction. A sealing element can be arranged circumferentially in the region of the mounting surface, which is molded in the region of the sealing section, for example, by a two-component injection molding method and protrudes in the direction of the inner side 20.1.

[0039] In addition to or instead of the seal, an energy director can also be provided which projects beyond the mounting surface. The energy director can be designed as a circumferential protrusion. The energy director can be used to weld the housing 20.3 to the receiving housing in a circumferentially sealing manner.

[0040] like Figure 2 As shown, the housing 20.3 can have a receiving portion 24, on which the membrane 40 is fixed with its periphery, preferably materially connected. Advantageously, the membrane 40 is configured in the shape of a disk, so that the edge of the disk forms a connecting area 43, and the membrane 40 can be fixed on the receiving portion 24 around the connecting area.

[0041] Preferably, the receptacle 24 is designed as a recess 26 which engages at the top into the cover section 28 . The recess 26 thus forms a peripheral connecting section 25 for the circumference of the membrane 40 .

[0042] A top surface 28 of the housing 20 . 3 merges into an outer wall 27 of the cover 21 .

[0043] The housing 20.3 can form a surrounding inner wall which surrounds the ventilation opening 20.4. The ventilation opening 20.4 can be closed by means of a membrane 40. The membrane 40 is designed as a surface element and preferably consists of a gas-permeable or gas-tight plastic film. The membrane 40 is substantially water-tight and preferably designed to be sufficiently strong and tear-resistant to prevent undesired failure of the membrane 40 due to the loading of water pressure from the outside 20.2.

[0044] The membrane 40 has a membrane outer side 41, which faces the outer side 20.2 of the housing 20.3. Opposite to the membrane outer side 41, the membrane 40 has a membrane inner side 42, which faces the inner side 20.1 of the housing 20.3.

[0045] like Figure 2 As can be seen, the membrane 40 has a circumferential connection area 43, which can be designed in particular in annular form. The membrane 40 is connected to the connection section 25 of the receptacle 24 in an airtight manner, preferably in a material connection, with this connection area 43. In particular, the membrane 40 can be injected back together with the housing 20.3 by a plastic injection molding method.

[0046] The connecting section 25 is designed as an annular circumferential surface on the receptacle 24. In particular, the connecting section 25 circumferentially surrounds the ventilation opening 20.4.

[0047] Figure 1 and Figure 2 It is also shown that a rupture element 30 is formed on the housing 20.3, which rupture element can have a cutting element as in this case. Preferably, the rupture element 30 is connected in one piece to the housing 20.3. Particularly preferably, the rupture element 30 is connected in one piece to the inner wall of the housing 20.3.

[0048] As shown in the drawings, the rupture element 30 is connected to the housing 20.3 via a connecting section 31, which can also be configured as a spring section. In addition, the entire rupture element 30 can also be additionally configured to be spring-elastic or to form a spring section.

[0049] The bursting element 30 has at its free end an end section 34 which forms an edge, preferably a cutting edge 34, on its side facing the outer side 20.2, such as Figure 2 shown.

[0050] Additionally or alternatively, it may also be provided that one or more edges of the bursting element 30 are designed with edges or edges, preferably cutting edges 33 , 34 .

[0051] The aforementioned cutting edges 33 , 34 may be configured in a point-shaped, line-shaped, arc-shaped or other manner.

[0052] In the present exemplary embodiment, the bursting element 30 is coupled to the housing 20.3, preferably in one piece via a coupling part 31. Starting from the coupling part 31, the bursting element 30 projects into the region in which the ventilation opening 20.4 is formed.

[0053] The bursting element 30 tapers continuously from the coupling part 31 in the direction of the end section 35. In this case, the cutting edges 33, 34 can converge from the coupling part 31 in the direction of the end section 35 and extend linearly.

[0054] like Figure 2 As shown, the connecting section 32 of the bursting element 30 can be made to transition flush into the surface of the connecting section 25. In this way, a continuous material connection can be made between the surrounding connecting section 43 of the membrane 40 and its connecting section 32. However, this is not necessary. In particular, the connecting section 32 can also be arranged at a distance from the receptacle 24.

[0055] like Figure 3 As shown, the bursting element 30 projects into the middle region of the membrane 30 and is therefore supported in the region of the membrane inner side 42 .

[0056] Figure 2 and Figure 3 It is also shown that the housing 20.3 of the pressure compensation device 20 has a central shoulder 23 adjacent to the fastening section 22. The central shoulder 23 is designed in the form of a circumferential web, such as Figure 3 The housing 20 . 3 can be aligned by means of the central shoulder 23 in a recess of a receiving housing, on which the pressure compensation device 20 can be mounted.

[0057] Figure 2 and Figure 3 It is also shown that the spacer 50 can be connected to the housing 20.3. The spacer 50 can be designed as an annular body.

[0058] Figure 2 The spacer 50 is shown to have a bottom side 52, by means of which the spacer can be placed on the cover section 28 and connected thereto, preferably materially connected. The spacer 52 then has a projection 51 on the bottom side 52, which projects upward in the direction of the outer side 20.2. The projection 51 is provided with a plurality of ventilation openings 55 in the form of recesses at its upper end.

[0059] The spacer 50 surrounds a gas conducting region 56 which is formed on the outer side 41 of the membrane.

[0060] The tabs 57 are integrally molded onto the projection 51. In the present exemplary embodiment, three tabs 57 are used, which are connected to one another in the middle region of the gas guide region 56 and can be arranged offset from one another by 120°. A fixing projection 58 is provided in the region where the tabs 57 converge. The fixing projection 58 protrudes upward from the tabs 57 in the direction of the outer side 20.2 and has a retaining element 58.1 which ends with a head 58.2.

[0061] The cover 60 can be connected to the spacer 50 . The cover 60 has a cover section 61 , in which a fastening receptacle 62 is formed. The cover section 60 also has a peripheral edge 63 .

[0062] To mount the cover 60 , it is connected to the spacer 50 . This is achieved in a simple manner by connecting the cover section 61 to the fastening projection 58 .

[0063] In this case, the cover 60 can be made of a flexible material, for example a rubber-like material. The cover section 61 can then be stretched in the region of the fastening receptacle 62 and guided over the head 58.2 so that it engages immediately with the holder 58.1.

[0064] Figure 3 It is shown that the cover section 61 of the cover cap 60 rests at the end face on the projection 51 in the installed state. Since the ventilation opening 55 is recessed relative to the free end of the projection 51, a gas-conducting connection can be established between the membrane outer side 41 and the environment.

[0065] Figure 3 It is also shown that, for the gas-conducting connection, the circumferential edge 63 of the cap 60 is also spaced apart from the outer wall 53 of the projection 51 , wherein the outer wall 53 is designed to be annular and circumferential.

[0066] When the pressure compensation device 20 is installed on a housing (not shown), the inner side 20.1 of the housing 20.3 and the membrane inner side 42 correspond to the interior of the housing. The outer side 20.2 and the membrane outer side 41 of the membrane 40 correspond to the environment.

[0067] If the membrane 40 is designed as a gas-permeable membrane 40 , the pressure difference between the environment and the interior of the accommodation housing can be equalized via the membrane 40 during normal operation in order to achieve the breathing function.

[0068] This pressure compensation takes place, for example, in the case of an increase in pressure relative to the surroundings in the interior of the receiving housing, gas passes through the gas-permeable membrane 40 into the gas-conducting region 56 of the spacer 50. From there, the gas is discharged into the surroundings via the ventilation opening 55. Likewise, pressure compensation takes place in the opposite direction in the case of a decrease in pressure in the interior of the receiving housing.

[0069] When the pressure in the receiving housing suddenly increases, the pressure increases at the inner side 42 of the membrane. The membrane 40 is thereby deformed in the direction of the outer side 20.2, in particular the membrane is arched in the direction of the outer side 20.2. This causes different deformation states to occur at the membrane 40. At the location where the inner side 42 of the membrane is connected, in particular materially connected, to the facing connecting section 32 of the rupture element 30, the membrane 40 is not deformed or is deformed less than the surrounding area covering the ventilation hole 20.4. Due to the different deformation states, the membrane 40 is separated in the area of ​​the connecting section 32 of the rupture element 30. In this case, in particular, the membrane 40 is torn at at least one of the above-mentioned cutting edges 33, 34 of the end section 35 and / or the connecting section 32 due to the pressure difference that occurs.

[0070] In this way, the membrane 40 is damaged and thus destroyed. As a result, the area of ​​the ventilation hole 20.4 is suddenly opened at least partially. The released air flow reaches the cover 60. If the air flow is so strong that it cannot be discharged via the ventilation opening 55, the flexible cover section 61 bends outwards and suddenly opens a larger cross section to discharge the air flow.

[0071] exist Figure 4 and Figure 5 . As can be seen from the figure, the ventilation opening 55 is formed in the area between the underside 52 of the spacer 50 and the cover section 28 of the housing 20.3. In addition, according to Figure 4 and Figure 5 The embodiment corresponds to the Figures 1 to 3 Therefore, in order to avoid repetition, reference is made to the above description.

Claims

1. A pressure compensation device (20) for compensating the internal pressure in a housing of an electrochemical or electrotechnical device, in particular for a battery housing, the pressure compensation device having a housing (20.3) having at least one ventilation hole (20.4), the ventilation hole forming a gas-permeable connection between an inner side (20.1) and an outer side (20.2) of the housing (20.3), wherein: The ventilation hole (20.4) is blocked by means of a gas-permeable or gas-tight membrane (40), wherein a rupture element (30) is assigned to the membrane (40), which is designed and positioned such that when the membrane (40) is deformed in the direction of the outer side (20.2), the membrane is destroyed at least at one location under the action of the rupture element (30) in order to provide a flow connection from the inner side (20.1) to the outer side (21.1) through the ventilation hole (26.2), It is characterized in that the membrane (40) is connected, in particular materially connected, to the bursting element (30) with its membrane inner side (42) facing the inner side (20.1) of the housing (20.3).

2. The pressure compensation device (20) according to claim 1, characterized in that: The bursting element (30) has a connecting section (32) having a connecting surface facing the membrane (40), to which the membrane (40) is fixed by material connection, the connecting surface transitioning into an edge, in particular an edge, preferably a cutting edge (33, 34) extending transversely to the connecting surface, and preferably the material connection extends to the edge, in particular an edge, preferably to the cutting edge (33, 34).

3. The pressure compensation device (20) according to claim 1 or 2, characterized in that: The membrane (40) has a circumference, by means of which it is circumferentially connected to the housing (20.3), so that the bursting element (30) protrudes into the region of the ventilation opening (20.4) and is connected, in particular materially connected, to the membrane (40) in a region within the circumference.

4. The pressure compensation device (20) according to claim 3, characterized in that: The membrane (40) covers a ventilation hole (20.4) having a surface area, wherein the surface area has a maximum free covering length, and the length of the rupture element (30) extending into the area of ​​the ventilation hole is at least 30% of the free covering length, and / or the minimum length of the material connection in one direction extends to at least 25% of the free covering length.

5. The pressure compensation device (20) according to any one of claims 1 to 4, characterized in that: The ventilation opening (20.4) is bounded by an annularly circumferential wall, and the bursting element (30) protrudes radially inwards from the wall into the region of the ventilation opening (20.4).

6. The pressure compensation device (20) according to any one of claims 1 to 5, characterized in that: The housing (20.3) has a cover section (28) with a circumferential receptacle (24), which is preferably designed as a recess (26) and which surrounds the ventilation opening (20.4), and the membrane (40) is placed with its circumference on the receptacle (24) or inserted in the receptacle (24), and the connecting area (43) of the circumferential edge is materially connected to the connecting section (25) of the receptacle (24).

7. The pressure compensation device (20) according to claim 6, characterized in that: A connecting section (32) of the bursting element (30) which is materially connected to the membrane (40) merges flush with the connecting section (25).

8. The pressure compensation device (20) according to any one of claims 1 to 7, characterized in that: The housing (20.3) carries a spacer (50) in the region of the outer side (20.2), which carries a cover (60) at a distance from the membrane (40), and which covers the membrane (40) with a cover section (61) at a distance from the outer side (41) of the membrane.

9. The pressure compensation device (20) according to claim 8, characterized in that: The spacer (50) has at least one ventilation opening (55) which provides a spatial connection between the outer side (41) of the membrane and the environment.

10. The pressure compensation device (20) according to claim 8 or 9, characterized in that: The spacer (50) is at least partially designed as an annular body or has such an annular body, so that the annular body has an outer wall (53) which is spaced apart from the edge (63) of the cover (60) and forms at least one exhaust area in the form of a spacing space between the edge and the outer wall.

11. The pressure compensation device (20) according to any one of claims 8 to 10, characterized in that The spacer (50) has a fixing projection (58) including a retaining element (58.1) in an area on the outer side (41) of the membrane and spaced apart from the outer side of the membrane, so that the cover section (61) is fixed to the spacer (50) at the retaining element (58.1), and the cover section (61) is composed of a flexible material.

12. The pressure compensation device (20) according to claim 11, characterized in that The spacer (50) has webs (57) which hold the fastening projections (58) on the outer side (41) of the membrane and form a gas conducting region (56) between the webs.

13. Method for compensating the internal pressure in a housing of an electrochemical or electrotechnical device, in particular a battery housing, using a pressure compensation device (20) according to any one of claims 1 to 12, wherein: In the event of an inadmissible pressure increase in the containment shell, the membrane (40) is deformed, in particular arched, in the direction of the outer side (20.2) facing away from the interior space of the containment shell, and the membrane (40) is destroyed at least at one location under the action of the rupture element (30) to provide a flow connection from the inside (20.1) to the outside (21.1) through the ventilation hole (26.2).

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