Degassing unit and housing, in particular battery housing

Abstract

Degassing unit (10) for a housing (20), in particular of a battery, in particular a traction battery of a motor vehicle, with a base body (12) that can be connected fluid-tight to an edge of a housing opening (24) of the housing (20), having an outer surface (18) and an inner surface (17), and which has at least one gas passage opening (15) which is closed with a membrane (30) stretched across a surface transverse to an axial direction (L), wherein the membrane (30) is fluid-tightly connected to the base body (12) at an edge (14) surrounding the gas passage opening (15), and wherein the membrane (30) is located on the inner surface (17) of the base body (12) and with a clamping frame (40) which is connected to the base body (12) in an area (16) located radially outside the rim (14) enclosing the gas passage opening (15) on the inside (17) of the base body (12), wherein the clamping frame (40) has a circumferential clamping surface (42) which exerts a clamping force on the membrane (30) so that the membrane (30) is held force-fit between the clamping frame (40) and the edge (14) of the base body (12) enclosing the gas passage opening (15), wherein the clamping force is introduced indirectly into the membrane (30) via a seal (32), and wherein the clamping frame (40) is welded, in particular ultrasonically welded, or bonded to the base body (12), wherein the clamping frame (40) has a radially projecting flange area (44) over the axial surface of which the welding or bonding takes place, wherein the radially projecting flange area (44) and the clamping surface (42) of the clamping frame (40) are arranged axially offset.

Description

Technical field

[0001] The invention relates to a degassing unit for a housing, in particular a battery, in particular a traction battery of a motor vehicle, and a housing, in particular a battery housing. State of the art

[0002] Enclosures for electronic components such as battery cells cannot be completely sealed gas-tight from the environment. On the one hand, due to temperature fluctuations, for example from heat input during charging and discharging of battery cells, and on the other hand, due to naturally occurring air pressure fluctuations, especially in mobile systems, gas exchange between the interior and exterior must be allowed. This gas exchange prevents impermissible mechanical stresses on the enclosure, particularly bursting or bulging. Furthermore, especially in battery enclosures, an emergency venting function must be provided in case of a sudden pressure increase due to battery cell failure.

[0003] Equally important, however, is the effective prevention of the ingress of foreign matter, dirt, and moisture in the form of liquid water. Therefore, pressure equalization devices are known that incorporate semipermeable membranes, for example, made of extruded polytetrafluoroethylene (PTFE), which are permeable to gas but impermeable to liquids.

[0004] DE 10 2012 022 346 B4 discloses a battery housing comprising a housing enclosing an interior space, with a housing opening covered by a membrane support in the form of a housing cover. This support is designed for degassing and for a substantially watertight seal of the housing interior against the ingress of, for example, water, and preferably also other liquids. The housing cover includes a support body with a gas passage opening extending continuously between an inner and an outer surface of the support body for the purpose of gas venting or pressure equalization. The gas passage opening is completely covered by a semipermeable membrane. The support body, the membrane, and the housing are hermetically or gas-tightly connected, such that substantially no water, and preferably also no air or gas, can enter the housing interior through the housing opening.

[0005] DE 10 2019 218 456 A1 discloses a battery with an emergency degassing system by which, in the event of overpressure in the battery housing, pressure equalization with the environment can be achieved by a pin-like trigger element piercing a membrane which closes an opening in the battery housing.

[0006] In DE 10 2005 021 950 A1, a drive unit is described with a housing which has an opening to the environment against which a diaphragm rests, and which has a first housing part with a circumferential flange and a second housing part that closes off the first housing part, wherein the opening with a circumferential contact surface is formed on the second housing part, which presses the diaphragm against the flange of the first housing part after the housing is closed. Disclosure of the invention

[0007] One object of the invention is to create a degassing unit for a housing, in particular a battery, especially a traction battery of a motor vehicle, which allows for rapid pressure reduction in the event of overpressure occurring in the housing.

[0008] Another task is to create a housing, in particular a battery housing, with a degassing unit that allows for rapid pressure reduction in the event of overpressure occurring in the housing.

[0009] The aforementioned problem is solved according to one aspect of the invention by a degassing unit for a housing, in particular a battery, in particular a traction battery of a motor vehicle, comprising a base body that can be connected in a fluid-tight manner to an edge of a housing opening of the housing, having an outer surface and an inner surface, and which has at least one gas passage opening which is closed with a membrane stretched across a surface transverse to an axial direction, wherein the membrane is connected to the base body in a fluid-tight manner at an edge surrounding the gas passage opening, and with a clamping frame which is connected to the base body in an area located radially outside the edge surrounding the gas passage opening on the inner surface of the base body, wherein the clamping frame has a circumferential clamping surface which exerts a clamping force on the membrane.so that the diaphragm is held securely between the clamping frame and the edge of the base body that surrounds the gas passage opening. The clamping force is indirectly introduced into the diaphragm via a seal. The clamping frame is welded, in particular ultrasonically welded, or bonded to the base body. Furthermore, the clamping frame has a radially projecting flange area, over the axial surface of which the welding or bonding takes place. The radially projecting flange area and the clamping surface of the clamping frame are arranged axially offset.

[0010] The further problem is solved according to a further aspect of the invention by a housing, in particular a battery housing, in particular a traction battery of a motor vehicle, for receiving battery cells, which has at least one housing wall with a housing opening, wherein the housing opening is closed by a degassing unit.

[0011] Favorable embodiments and advantages of the invention will become apparent from the further claims, the description and the drawing.

[0012] According to one aspect of the invention, a degassing unit for a housing, in particular a battery, in particular a traction battery of a motor vehicle, is proposed, comprising a base body which can be connected in a fluid-tight manner to an edge of a housing opening of the housing, having an outer surface and an inner surface, and which has at least one gas passage opening which is closed with a membrane stretched across a surface transverse to an axial direction, wherein the membrane is connected to the base body in a fluid-tight manner at an edge surrounding the gas passage opening, and with a clamping frame which is connected to the base body in an area located radially outside the edge surrounding the gas passage opening on the inner surface of the base body.The clamping frame has a circumferential clamping surface that exerts a clamping force on the diaphragm, so that the diaphragm is held securely between the clamping frame and the edge of the base body that surrounds the gas passage opening. The clamping force is indirectly transferred to the diaphragm via a seal.

[0013] The continuous, all-around seal ensures an even distribution of the clamping force across the membrane. Additionally, this seal guarantees a tight seal even with minimal gaps.

[0014] The diaphragm is located on the inside of the base body. In this way, the diaphragm is pressed into its sealing seat when there is overpressure in the housing and can only be deliberately ruptured under defined conditions by a bursting mechanism, such as an emergency degassing pin.

[0015] Arranging both the diaphragm and the clamping frame on the inside of the housing offers the advantage that, on the one hand, the diaphragm is pressed into its sealing seat under overpressure within the housing, and on the other hand, the clamping frame is also subjected to pressure in the clamping direction. This ensures a secure clamping of the diaphragm even under extreme pressure peaks. In contrast, if the clamping frame is attached to the outside of the housing under pressure, there is a risk that the clamping force acting on the diaphragm will be reduced, potentially causing it to detach from its clamping position.

[0016] Emergency venting of high-voltage batteries typically uses venting units with permeable PTFE membranes. However, the permeability, which is a major cost factor for the membrane, is not necessary for the emergency venting function itself. Therefore, the membrane, which only serves to equalize pressure, can be replaced by a significantly less expensive film with the same bursting properties to remove the gas flow released during a thermal event caused by a battery cell failure.

[0017] However, very few of the films suitable for bursting can be welded to the base body. Therefore, an alternative fastening method is proposed for a fluid-tight attachment of the membrane to the base body.

[0018] Advantageously, in the degassing unit according to the invention, the membrane is clamped onto the base body in a fluid-tight manner. This type of membrane attachment is particularly useful when a different material pairing of the membrane film and the base body, for example, makes welding the film impossible. Instead of a commonly used, expensive PTFE membrane, which is welded to the base body by ultrasonic welding, a cost-effective film can thus be clamped onto the base body as a rupture membrane.

[0019] The membrane is clamped to the base body using a clamping frame and a seal. The clamping force can be applied, for example, by welding, particularly ultrasonic welding, of the clamping frame to the base body. However, other joining techniques are also conceivable, such as snap-fit ​​connections using locking hooks, ring snaps, gluing, etc.

[0020] The degassing unit according to the invention thus results in cost savings compared to the use of PTFE membranes.

[0021] Advantageously, existing manufacturing facilities can be used. An existing base body can be used to equip the degassing unit with the membrane clamping according to the invention.

[0022] Manufacturing can be carried out using existing and well-known processes such as ultrasonic welding. This results in a flexible solution, as different films can be clamped onto the carrier plate, regardless of the material pairing.

[0023] This solution is applicable to gas-tight, pure burst membranes or also to permeable membranes if they cannot be welded directly onto the carrier plate.

[0024] According to a favorable design of the degassing unit, the membrane can be held solely by friction between the clamping frame and the edge of the base body that surrounds the gas passage opening. In this way, a wide variety of film materials, which cannot be welded to the base body, can be used as rupture membranes. This results in cost-effective solutions for a degassing unit.

[0025] The clamping frame is at least partially bonded to the base body. Advantageously, this allows the necessary clamping force for a fluid-tight connection between the membrane and the base body to be achieved without the need for bonding processes.

[0026] In a favorable design of the degassing unit, the seal can be positioned between the clamping frame and the diaphragm or between the diaphragm and the base body. The seal thus ensures a uniform clamping force on the diaphragm, guaranteeing a reliable fluid-tight connection between the diaphragm and the base body. This ensures a permanent seal of the gas passage opening during normal operation of the housing.

[0027] The seal can be a conventional elastomer seal or a liquid seal. For example, the seal can be injection-molded onto the clamping frame or the base body as a two-component seal. If it is an elastomer seal, it can have a round cross-section, such as an O-ring, or a rectangular cross-section.

[0028] According to a favorable design of the degassing unit, the gas passage opening can be completely covered by the membrane. This ensures a permanent seal of the gas passage opening during normal operation of the housing. This prevents dirt particles or moisture from penetrating the housing and potentially endangering the operation of, for example, a high-voltage battery.

[0029] According to a favorable embodiment of the degassing unit, the membrane can be designed as a gas-impermeable membrane, in particular as a polymer film, or as a semipermeable membrane, which allows the passage of gaseous media from an environment into the housing and vice versa, and prevents the passage of liquid media and / or solids.

[0030] For example, non-porous membranes in the form of polymer films can be used as gas-impermeable membranes. Laminated films or silver-coated films can also be used to ensure the housing's airtightness during normal operation.

[0031] Any material that exhibits sufficient gas permeability for ventilation during normal operation and adequate water impermeability can be used for the semipermeable membrane. Polytetrafluoroethylene (PTFE) is a preferred material for the semipermeable membrane. The semipermeable membrane has an average pore size that can range from 0.01 micrometers to 20 micrometers. The porosity is preferably around 50%; the mean pore size is preferably about 10 micrometers.

[0032] The membrane thickness is significantly smaller than its other external dimensions. The membrane can span a minimum width and / or length or a minimum outer diameter of 20 mm or greater, preferably 30 mm or greater, and in particular 40 mm or greater. The membrane thickness can be at least 20 times, preferably at least 40 times, and in particular at least 100 times smaller than the minimum width and / or length or the minimum outer diameter of the membrane. The membrane thickness can range from 1 micrometer to 5 millimeters, with a membrane thickness of 0.1 to 2 mm, and in particular 0.15 to 0.5 mm, being preferred.

[0033] According to the invention, the clamping frame can be welded, in particular ultrasonically welded, or bonded to the base body. The clamping frame can, for example, be made of the same plastic as the base body. This provides favorable conditions for a material-bonded connection, for example, by ultrasonic welding or bonding.

[0034] According to the invention, the clamping frame has a radially projecting flange area, over the axial surface of which welding or bonding takes place. The flange area can advantageously provide sufficient surface area to ensure a permanent and reliable connection by welding or bonding the clamping frame and the base body. In particular, this also provides sufficient space for the suitable positioning of the tool, such as a sonotrode, especially in ultrasonic welding.

[0035] According to a favorable design of the degassing unit, the clamping surface can be arranged radially within the flange area. In this way, a reliable and durable fluid-tight connection between the diaphragm and the base body can be achieved.

[0036] According to a favorable embodiment of the degassing unit, the base body can have an axial recess relative to the edge surrounding the gas passage opening, where the membrane is arranged in a fluid-tight manner. The clamping frame is bonded to this axial recess. Such a design enables a cost-effective manufacturing process. In particular, the membrane can be suitably inserted and positioned before the clamping frame is bonded to the base body by ultrasonic welding.

[0037] According to a favorable design of the degassing unit, the axial recess can be arranged radially outward from the edge surrounding the gas passage opening. In this way, a reliable and durable fluid-tight connection between the membrane and the base body can be achieved.

[0038] According to the invention, the radially projecting flange area and the clamping surface of the clamping frame are arranged axially offset. Such a design enables a cost-effective manufacturing process. In particular, the membrane can be suitably inserted and positioned before the clamping frame is bonded to the base body by ultrasonic welding.

[0039] According to a favorable design of the degassing unit, a housing seal can be arranged around the gas passage opening on the inside of the base body.

[0040] The housing seal can be designed as an axial or radial seal, i.e., it can be located on an end face (in the case of an axial seal) or on a cylindrical surface (in the case of a radial seal). The housing seal can be designed as an O-ring, which is received in a corresponding groove of the base body, or as an injection-molded sealing component. An axial configuration of the housing seal is preferred, with the housing seal particularly preferably surrounding a bayonet fitting that projects in the axial direction. The housing seal can also be designed as a molded seal with a non-circular, particularly longitudinally elongated, cross-section.

[0041] According to a favorable embodiment of the degassing unit, a cover can be arranged on the outside of the base body. In particular, the cover can have at least one ventilation opening. The cover protects the membrane from mechanical influences from the outside of the base body. At the same time, however, gas escape can be permitted, for example, via ventilation openings or via a sufficient gap between the cover and the base body.

[0042] According to a favorable embodiment of the degassing unit, a mandrel carrier with an emergency degassing mandrel directed towards the membrane can be arranged between the membrane and the cover, which is provided for piercing the membrane which is curved towards the outside by an internal housing pressure, wherein the emergency degassing mandrel is integrated in the base body or in the clamping frame or in the cover.

[0043] During normal battery operation, the emergency venting pin is positioned at a predetermined distance from the membrane surface. When internal pressure in the casing increases, the membrane bulges towards the venting pin and presses against it, allowing the pin's tip to pierce the membrane. Due to its pointed shape, the venting pin creates a controlled weakening of the membrane, causing it to rupture. This ensures the fastest possible emergency venting function, which is crucial to guaranteeing the integrity of the casing structure in the event of a sudden increase in internal pressure. The emergency venting pressure can be adjusted by varying the distance between the pin's tip and the membrane surface.

[0044] According to a favorable embodiment of the degassing unit, the base body can be rigidly connected to a protective grid arranged on its inner surface. In particular, the protective grid can be integrated into the base body. The protective grid protects the membrane from mechanical damage from the interior. Furthermore, the protective grid also ensures that, in the event of a battery cell failure in the battery housing and a resulting thermal event, particles with a larger size than the mesh size of the protective grid remain inside the housing and cannot escape into the environment.

[0045] According to another aspect of the invention, a housing, in particular a battery housing, especially of a traction battery of a motor vehicle, is proposed for receiving battery cells, which has at least one housing wall with a housing opening, wherein the housing opening is closed by a degassing unit according to the invention.

[0046] In particular, the degassing unit is mounted such that it is connected to a wall of the housing by means of at least one fastening element, especially a screw, wherein the fastening element engages with the fastening element area of ​​the base body. The screw connection generates the sealing preload forces necessary for compressing the housing seal. The screw connection can be made, in particular, from inside the electronic housing. Of course, embodiments of the invention also include those in which the degassing unit is screwed to the housing from the outside.

[0047] Finally, the housing wall can have a sealing surface on its outer side, circumferencing the housing opening, against which the housing seal of the degassing unit rests in an assembled state. The sealing surface is preferably designed as a region of the housing wall with minimal deviations in flatness and roughness. Advantageously, the housing, or at least its wall, is made of or consists of a metallic material, so that the sealing surface can be easily achieved with the aforementioned properties through mechanical machining. Brief description of the drawings

[0048] Further advantages become apparent from the following description of the drawings. The drawings illustrate exemplary embodiments of the invention. The drawings, the description, and the claims contain numerous features in combination. A person skilled in the art will expediently consider the features individually and combine them into meaningful further combinations.

[0049] They show, for example: Fig. 1 an isometric view of a degassing unit according to an embodiment of the invention from an outside; Fig. 2 an isometric view of the degassing unit according to Fig. 1 from an inside; Fig. 3 the isometric view of the degassing unit according to Fig. 1 from the inside with the protective grille removed; Fig. 4 an isometric sectional view of the degassing unit according to Fig. 1 with a semi-cut base body; Fig. 5 the isometric sectional view of the degassing unit according to Fig. 4 with cut-off seal; Fig. 6 a longitudinal section through the degassing unit according to Fig. 1; and Fig. 7 an enlarged longitudinal section through the degassing unit after Fig. 1 in the area of ​​the membrane clamping. Embodiments of the invention

[0050] In the figures, identical or similar components are numbered with the same reference symbols. The figures merely show examples and are not to be understood as limiting.

[0051] Fig. Figure 1 shows an isometric view of a degassing unit 10 for a housing 20, in particular a battery, especially a traction battery of a motor vehicle, according to an embodiment of the invention from an outside 18, while in Fig. 2 an isometric view of the degassing unit 10 from an inside 17 can be seen. Fig. Figure 3 shows the isometric view of the degassing unit 10 from the inside 17 with the protective grille 70 removed.

[0052] Details of degassing unit 10 are in the Fig. 4 with an isometric sectional view with a half-sectioned base body 12, as well as in Fig. 5 with an isometric sectional view with cut-off seal 32, and in Fig. 6, where a longitudinal section through the degassing unit 10 is shown. Fig. Figure 7 shows an enlarged longitudinal section through the degassing unit 10 in the area of ​​the clamping of the membrane 30.

[0053] The degassing unit 10 has a base body 12, with an outer surface 18 and an inner surface 17, which is fluid-tight to an edge of a housing opening 24 of the housing 20 (in longitudinal section in Fig. 6 schematically represented) can be connected.

[0054] The degassing unit 10 further has a gas passage opening 15 (see Fig. 6) which is closed by a membrane 30 stretched across a surface transverse to an axial direction L. The gas passage opening 15 is completely covered by the membrane 30. The membrane 30 is located on the inner side 17 of the base body 12.

[0055] The membrane 30 is fluid-tightly connected to the base body 12 at an edge 14 surrounding the gas passage opening 15.

[0056] The membrane 30 can be designed as a gas-impermeable membrane, in particular as a polymer film.

[0057] Alternatively, it is also possible that the membrane 30 is designed as a semipermeable membrane, which allows the passage of gaseous media from an environment into the housing 20 and vice versa, while preventing the passage of liquid media and / or solids.

[0058] A clamping frame 40 is connected to the base body 12 in a region 16 that lies radially outside the rim 14 surrounding the gas passage opening 15. The clamping frame 40 has a circumferential clamping surface 42 that exerts a clamping force on the diaphragm 30. This ensures that the diaphragm 30 is held exclusively by friction between the clamping frame 40 and the rim 14 of the base body 12 surrounding the gas passage opening 14.

[0059] The clamping frame 40 is materially bonded to the base body 12. Preferably, the clamping frame 40 can be welded to the base body, in particular by ultrasonic welding. However, bonding to the base body 12 is also conceivable.

[0060] The clamping force is indirectly introduced into the membrane 30 via a seal 32. This ensures a uniformity of the clamping force across the clamping surface 42.

[0061] In this case, the seal 32 is arranged between the membrane 30 and the base body 12. Alternatively, it is also possible for the seal 30 to be arranged between the clamping frame 40 and the membrane 30.

[0062] On the outside 18 of the base body 12 a cover 50 is arranged, which has four ventilation openings 52.

[0063] A mandrel carrier 62 with an emergency degassing mandrel 60 directed towards the diaphragm 30 is arranged between the diaphragm 30 and the cover 50. The mandrel 60 is designed to pierce the diaphragm 30, which is curved towards the outside 18 by internal housing pressure. In this embodiment, the emergency degassing mandrel 60 is integrated into the base body 12 via the mandrel carrier 62. Alternatively, the emergency degassing mandrel 60 can also be integrated into the clamping frame 40 or the cover 50.

[0064] The base body 12 is firmly connected to a protective grid 70 arranged on its inner side 17, as shown in particular in Fig. 2 can be seen. The protective grille 70 is welded to the base body 12 via weld points 72, for example by ultrasonic welding. In an alternative embodiment, however, the protective grille 70 can also be integrated directly into the base body 12.

[0065] The base body 12 also has four mounting tabs 80 at its corners, into which insert bushings 82 are integrated. The degassing unit 10 can be connected to the housing 20 via these mounting tabs 80, for example by screwing it on.

[0066] A housing seal 26 ( Fig. 2 and Fig. 3) is arranged around the gas passage opening 15 on the inside 17 of the base body 12 and serves to seal the degassing unit 10 against the housing wall 22. The externally visible inspection tab 28 of the housing seal 26 provides a check of the presence of the housing seal 26 when the degassing unit 10 is installed.

[0067] As seen in the longitudinal sections in Fig. 6 and especially in Fig. As can be seen in Figure 7, the clamping frame 40 has a radially projecting flange area 44, over the axial surface of which welding or bonding to the area 16 of the base body 12 takes place. The clamping surface 42 of the clamping frame 40 is arranged radially within the flange area 44. The radially projecting flange area 44 and the clamping surface 42 of the clamping frame 40 are arranged axially offset.

[0068] The base body 12 has an axial recess 19 relative to the rim 14 surrounding the gas passage opening 15, on which the membrane 30 is arranged in a fluid-tight manner. The clamping frame 40 is materially bonded to this axial recess 19. The axial recess 19 is arranged radially outwards relative to the rim 14 surrounding the gas passage opening 15.

[0069] In longitudinal section in Fig. Figure 6 schematically shows the housing 20 in the cutout as housing wall 22 with a housing opening 24. The housing opening 24 is closed by the degassing unit 10.

[0070] The degassing unit 10 is sealed against the housing wall 22 by the housing seal 26, which is inserted into a circumferential sealing groove 13 on the outer edge of the base body 12. Reference sign 10 Degassing unit 12 basic shapes 13 Sealing groove 14 Rand 15 Gas passage opening 16 area 17 Inside 18 Outside 19 Jump back 20 cases 22 Housing wall 24 Case opening 26 Housing seal 28 Visible flag seal 30 Membran 32 Seal 40 clamping frames 42 clamping surface 44 Flange area 50 Cover 52 Ventilation opening 60 Emergency degassing spike 62 Spindle carriers 70 protective grilles 72 welding points 80 Mounting tab 82 Insert bushing L Axial direction

Claims

Degassing unit (10) for a housing (20), in particular a battery, in particular a traction battery of a motor vehicle, comprising a base body (12) which can be connected in a fluid-tight manner to an edge of a housing opening (24) of the housing (20), having an outer surface (18) and an inner surface (17), and which has at least one gas passage opening (15) which is closed with a membrane (30) stretched across a surface transversely to an axial direction (L), wherein the membrane (30) is connected in a fluid-tight manner to the base body (12) at an edge (14) enclosing the gas passage opening (15), and wherein the membrane (30) is located on the inner surface (17) of the base body (12) and is connected to a clamping frame (40) which is connected to the base body (12) in a region (16) located radially outside the edge (14) enclosing the gas passage opening (15) on the inner surface (17) of the base body (12). is, wherein the clamping frame (40) has a circumferential clamping surface (42),which exerts a clamping force on the membrane (30) such that the membrane (30) is held force-fit between the clamping frame (40) and the edge (14) of the base body (12) enclosing the gas passage opening (15), wherein the clamping force is introduced indirectly into the membrane (30) via a seal (32), and wherein the clamping frame (40) is welded, in particular ultrasonically welded, or bonded to the base body (12), wherein the clamping frame (40) has a radially projecting flange area (44) over the axial surface of which the welding or bonding takes place, wherein the radially projecting flange area (44) and the clamping surface (42) of the clamping frame (40) are arranged axially offset. Degassing unit according to claim 1, wherein the membrane (30) is held exclusively by friction between the clamping frame (40) and the edge (14) of the base body (12) surrounding the gas passage opening (15). Degassing unit according to claim 1 or 2, wherein the seal (32) is arranged between clamping frame (40) and membrane (30) or between membrane (30) and base body (12). Degassing unit according to one of the preceding claims, wherein the gas passage opening (15) is completely covered by the membrane (30). Degassing unit according to one of the preceding claims, wherein the membrane (30) is designed as a gas-impermeable membrane, in particular as a polymer film, or as a semipermeable membrane which allows the passage of gaseous media from an environment into the housing (20) and vice versa, and prevents the passage of liquid media and / or solids. Degassing unit according to one of the preceding claims, wherein the clamping surface (42) is arranged radially within the flange area (44). Degassing unit according to one of the preceding claims, wherein the base body (12) has an axial recess (19) opposite the edge (14) surrounding the gas passage opening (15), on which the membrane (30) is arranged in a fluid-tight manner, wherein the clamping frame (40) is arranged in a material-bonded manner on this axial recess (19). Degassing unit according to claim 7, wherein the axial recess (19) is arranged radially outwards relative to the rim (14) surrounding the gas passage opening (15). Degassing unit according to one of the preceding claims, wherein a housing seal (26) is arranged circumferentially around the gas passage opening (15) on the inside (17) of the base body (12). Degassing unit according to one of the preceding claims, wherein a cover (50) is arranged on the outside (18) of the base body (12), in particular having at least one ventilation opening (52). Degassing unit according to claim 10, wherein a mandrel carrier (62) with an emergency degassing mandrel (60) directed towards the membrane (30) is arranged between the membrane (30) and the cover (50), which is provided for piercing the membrane (30) which is curved towards the outside (18) by an internal housing pressure, wherein the emergency degassing mandrel (60) is integrated in the base body (12) or in the clamping frame (40) or in the cover (50). Degassing unit according to one of the preceding claims, wherein the base body (12) is firmly connected to a protective grid (70) arranged on its inside (17), in particular wherein the protective grid (70) is integrated in the base body (12). Housing (20), in particular battery housing, in particular of a traction battery of a motor vehicle, for receiving battery cells, which has at least one housing wall (22) with a housing opening (24), wherein the housing opening (24) is closed by a degassing unit (10) according to one of the preceding claims.

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