Safe degassing device for a multi-cell battery system, battery and motor vehicle

Abstract

Degassing device (14) for a battery device (10) comprising several battery cells (50), comprising a base element (16) surrounding a degassing opening (18) and a cover element (22) which, in a ready-to-use state, is attached to the base element (16) covering the degassing opening (18), wherein: - the attachment (26) of the cover element (22) to the base element (16) holds the cover element (22) against a predefined internal pressure acting on an inner surface (28) of the cover element (22) facing the battery cells (50) in the intended installation position and releases the cover element (22) at a higher internal pressure, and - the cover element (22) is additionally connected to the base element (16) by a retaining element (40) which prevents the cover element (22) from being thrown away from the base element (16) when it is released It is secured by exceeding the predefined internal pressure and is characterized by the following:that the degassing opening (18) is penetrated by a web (32) which is an integral part of the base element (16) or attached to the base element (16), and the cover element (22) is attached to and / or supported on this web (32), and the degassing opening (18) is additionally closed by a bursting membrane, which is arranged on the inside of the cover element (22) on the side facing the battery cells (50) in its intended installation position, wherein the cover element is designed to be more rigid and stable than the bursting membrane.

Description

[0001] The present invention relates to a degassing device for a battery device comprising several battery cells. The invention further relates to a corresponding battery and a motor vehicle equipped therewith.

[0002] In known batteries, especially lithium-based ones, damage can lead to thermal runaway in a battery cell. This can cause the release of hot gases, which lead to a pressure increase within the battery casing and may potentially trigger thermal runaway in other battery cells. To prevent this, these hot gases can be vented from the battery casing. However, the challenge lies in ensuring that the battery casing remains as airtight and robust as possible until such thermal runaway occurs. Furthermore, the overpressure within the battery casing can cause component fragments to be ejected uncontrollably from the battery if it ruptures or bursts at a venting point.

[0003] For example, WO 2013 / 092 543 A1 describes a battery module consisting of a battery module housing and battery cells. The battery module housing described therein may have two exhaust valves in a lid, which can discharge gases collected in a collar-like frame to the outside.

[0004] As a further example, DE 10 2018 210 307 A1 describes an energy storage device for a motor vehicle. This device comprises a housing and a venting unit, which allows fluid to be discharged from the housing for venting. The energy storage device has a support structure that enables it to be attached to the vehicle's body. This support structure includes a strut with a hollow cross-section and an overflow opening through which the fluid discharged from the housing via the venting unit can be introduced into the hollow cross-section of the strut. The fluid is then cooled by means of the strut as it flows through the hollow cross-section. This ensures particularly safe operation.

[0005] The object of the present invention is to enable, in a simple manner, improved safety and robustness of a degassing device for a battery compared to conventional solutions.

[0006] This problem is solved according to the invention by the subject matter of the independent claims. Possible embodiments and further developments of the present invention are disclosed in the dependent claims, in the description, and in the figures.

[0007] The degassing device according to the invention [MAE1] is designed for, i.e., configured for, a battery device comprising several battery cells. The degassing device can therefore be installed in or as part of such a battery device. Such a battery device in the present sense can, for example, be a complete battery, i.e., a complete battery with a battery housing, such as a high-voltage or traction battery for a motor vehicle or the like. Likewise, the battery device can, for example, be a battery module functioning as a component of a complete battery with its own module housing. The degassing device can then be configured for venting or degassing the battery housing or the module housing and arranged on it or integrated therein in the intended installation position.

[0008] The degassing device according to the invention comprises a base element that has, surrounds, or limits a degassing opening. The base element can, for example, be a housing or the main body of the degassing device. Likewise, the base element can be the housing for receiving the multiple battery cells of the battery device or be designed as a component thereof.

[0009] Furthermore, the degassing device according to the invention comprises a cover element which, in a ready-to-use state of the degassing device, covers the degassing opening and is attached to the base element. In the present sense, such a ready-to-use state of the degassing device is a state in which the degassing opening is covered by the cover element for the proper normal operation of the battery device, i.e., it is not, or not yet, opened by increased internal pressure of the battery device, and thus is not, or not yet, completely or partially lifted from the base element. For example, the ready-to-use state can therefore be present for, during, or immediately after final assembly of the degassing device on the battery device.

[0010] To seal the degassing opening in the ready-to-use state, a seal can be arranged between the base element and the cover element, sealing the degassing opening. This seal can, for example, completely surround or enclose the degassing opening. Alternatively, the degassing opening can be sealed by a rupture membrane. Such a rupture membrane can seal the degassing opening in addition to or as an alternative to the aforementioned seal of the cover element. For this purpose, the rupture membrane can be connected to the base element in a watertight and gas-tight manner, particularly on the side facing the degassing opening. The rupture membrane can be positioned, in particular, on the inside of the cover element, i.e., on the side facing the battery cells in its intended installation position.If the degassing opening is tightly sealed by the rupture diaphragm, the seal on the cover element can be omitted. This allows for a particularly space-saving design of the degassing device, as well as particularly simple and precise adjustment or adaptation of the degassing device to specific requirements. For example, this makes it particularly easy and precise to set an opening pressure or force at which the cover element detaches from the base element, since this is then not affected by a seal between the cover element and the rupture element. The cover element can easily be designed to be more robust, i.e., more resilient, than the rupture diaphragm, thus reducing the risk of unintentional damage to the rupture diaphragm, for example, from external influences.

[0011] According to the invention, the cover element is held against a predefined internal pressure acting on the inner surface facing the battery cells by its attachment to the base element. This internal pressure is determined by the intended installation position of the degassing device. However, if the internal pressure exceeds the predefined internal pressure, the attachment releases the cover element. This results in a controlled failure or yielding of the attachment. In other words, at sufficiently high internal pressures, the cover element can detach at least partially or in certain areas from the base element, thereby enabling degassing and pressure reduction or equalization. Below the predefined internal pressure, i.e., until a corresponding load on the cover element is reached, the cover element remains in place.The fastening can also exert or apply a corresponding pressure force to the seal, if provided, between the cover element and the base element in order to seal the degassing opening.

[0012] Furthermore, according to the invention, the cover element is connected to the base element by a retaining element in addition to the aforementioned fastening. This retaining element secures the cover element against being ejected from the base element—at least beyond a maximum length of the retaining element—when the base element is released due to exceeding the predefined internal pressure. In other words, the fastening can yield when the predefined internal pressure or a corresponding load is exceeded, allowing the cover element to detach from the fastening and at least partially from the base element. However, the retaining element then prevents the cover element from moving uncontrollably far from the base element and thus, in its intended installation position, from the battery device.

[0013] The present invention thus advantageously enables a more predictable or controlled behavior of the degassing device in the event of a fault, i.e., during a degassing process. In particular, uncontrolled detachment and flying of components or fragments in the event of a fault can be avoided, thereby reducing the risk of secondary damage.

[0014] The cover element can be attached to the base element, for example, by means of a releasable positive locking mechanism, clamping, adhesive bonding, and / or similar methods. In particular, the attachment can be symmetrical along or with respect to the degassing opening. This allows for a particularly uniform pressure to be exerted on the seal, which may be located between the cover element and the base element, thus achieving a particularly good and reliable seal in the area of ​​the degassing device.

[0015] The cover element can be a single piece. In other words, the degassing opening can be covered by exactly one cover element. However, the cover element can also be multi-part, or several cover elements can be provided, each partially covering the degassing opening but collectively covering it completely. Each separate part of the cover element, or each cover element itself, can then be held in place by its own fastening and secured by its own retaining element. Such a multi-part or multi-section cover for the degassing opening allows for more precise control or adjustment of the degassing behavior, for example, through differently shaped cover elements or cover element components that move differently when the predefined internal pressure is exceeded.For example, a cover element or cover element part can only partially open to impose a flow direction on the gas stream exiting through the degassing opening. Another cover element or cover element part can, for example, detach further or completely from the base element to provide a sufficiently large flow cross-section overall.

[0016] A further advantage of the present invention is that it opens up the possibility of increasing the robustness of the degassing device and thus ultimately of the entire battery device in a particularly simple manner. While the degassing device can be sealed, for example against water and gaseous substances, the cover element, i.e., the cover of the degassing opening, does not need to be composed of different components, for example, a gas-tight membrane and an additional, more robust lid placed over it.

[0017] In one possible embodiment of the present invention, the cover element is designed to be resistant to pressure loads or mechanical loads that, in the intended installation position, act or can act on an outer surface of the cover element facing away from the battery cells, i.e., opposite the inner surface, and that are greater than the predefined internal pressure. For this purpose, the cover element is supported on the base element against pressure loads or forces acting on the outer surface, i.e., from the outside in the direction of the battery cells in the intended installation position. The cover element can, for example, be designed as a dimensionally stable or rigid, or at least non-flexible, plate, for example, made of a plastic. The cover element can therefore be particularly robust or stable than a conventional film or rupture membrane.This is the case because the fastening, which yields when the predefined internal pressure is exceeded, allows the degassing opening to be reliably released without the cover element itself having to burst, tear or crack.

[0018] This allows for a greater robustness of the degassing device and thus of the battery assembly as a whole, without the need for additional lids or similar components. Consequently, the degassing device and / or the battery assembly can reliably withstand external environmental influences, such as mechanical contact with other components, a high-pressure water jet, external air pressure surges, and / or similar conditions, without compromising the battery assembly's integrity.

[0019] This is supported by the fact that the cover element is braced against the base element. For example, the cover element can rest on an outer surface or bearing surface of the base element that faces away from the battery cells when installed in the intended position. This allows the cover element to detach or remove itself freely to the outside when the predefined internal pressure is exceeded, thus exposing the degassing opening, while it is supported and held in place from the opposite direction. Overall, the stability of the fastening, or the support or bearing of the cover element, is therefore asymmetrical with respect to loads or pressures acting on the inside and outside.

[0020] In a further possible embodiment of the present invention, the attachment of the cover element to the base element is designed as a releasable snap connection. Such a snap connection can also be referred to as a clip connection, clip connection, or the like. Such a snap connection can be manufactured in a manner known per se and designed for a predetermined holding force according to the predefined internal pressure. For example, the cover element can have a projection or lip that can engage in a corresponding receptacle of the base element. Likewise, the cover element can have a receptacle that can be attached or slipped onto a corresponding projection or lip of the base element. The receptacle and / or the projection or lip can be flexible, movable, or spring-loaded. The snap connection proposed here allows for particularly simple and precise attachment.With particularly low tolerances, a fastening system can be implemented that holds the cover element precisely up to the predefined internal pressure and releases it when this pressure is exceeded.

[0021] In a further possible embodiment of the present invention, the cover element is attached to and / or supported at least partially on a side or surface of the base element facing the degassing opening or surrounding or limiting the degassing opening. This allows for a particularly high degree of resistance or robustness against external pressures, loads, or forces acting in the direction of the support in a particularly simple manner. Furthermore, this reduces the susceptibility of the degassing device as a whole, and the attachment of the cover element in particular, to damage or external or environmental influences, since the attachment can be at least partially, and in particular completely, concealed from the external environment by the cover element itself and / or by the base element.This ensures that the degassing device functions reliably over the long term, meaning that its mounting is not affected by external environmental influences such as the accumulation of dust, dirt, lubricants, or the like. Furthermore, the proposed design allows for a particularly space-saving degassing device, as there is typically free space available in the degassing opening anyway. In particular, the diameter of the entire degassing device can be kept very small, for example, if the aforementioned seal is already located on an outer surface of the base element facing away from the battery cells in its intended installation position, such as the contact surface mentioned elsewhere.This contact surface does not need to be enlarged to accommodate both the seal and the mounting of the cover element. Such a seal arrangement can advantageously seal the mounting of the cover element against the external environment. The mounting of the cover element can project obliquely or in a strut-like manner from the side of the base element facing the degassing opening, for example, with respect to a main plane of extension of the cover element, so that a corresponding contact or load-bearing point on the cover element is offset from the edge of the degassing opening towards its center. This further increases the robustness and stability of the cover element, for example, against deflection caused by external forces or loads.

[0022] In a further possible embodiment of the present invention, the degassing opening is penetrated by at least one web. The cover element is then attached to or supported on this web. The attachment of the cover element can thus be arranged on or supported by this web. The web can be a direct or integral part of the base element or be attached to or supported by the base element, for example by a material-bonded connection or by a positive fit in a corresponding receptacle of the base element or of a main part or body of the base element. In particular, the attachment of the cover element can be arranged or supported centrally on this web, and thus, in particular, at least substantially at the center of the degassing opening.The proposed arrangement further increases the load-bearing capacity of the cover element against external stresses and thus the overall robustness of the degassing device. The center of the web or degassing opening offers the most efficient way to improve load-bearing capacity, allowing for material savings compared to, for example, a greater thickness of the cover element across its entire surface. The cover element can be attached solely to the web or additionally to an edge of the degassing opening. Securing the cover element to the web, particularly in its center, ensures a particularly uniform contact force on any seal located between the cover element and the base element, resulting in a particularly consistent and reliable seal of the degassing opening.Similarly, the cover element can be attached to the base element at the edge of the degassing opening or next to the degassing opening and merely supported by the web. For this purpose, a corresponding support element can extend perpendicular to the main plane of extension of the cover element on the inside, reaching as far as the web. Such a support element can be an integral part of the cover element, connected to it, arranged as a separate component between the cover element and the web, or be an integral part of the web itself.

[0023] In a further possible embodiment of the present invention, the retaining element is or comprises a hinge, or is designed as a hinge. The hinge allows the cover element to be opened or folded away from the degassing opening relative to the base element. For this purpose, one side of the hinge can be attached to the base element and the other side to the cover element. Such a hinge can enable or enforce a particularly precise movement of the cover element in the event of a malfunction. A maximum opening degree or angle of the cover element can be easily set or specified, for example, by means of a corresponding stop on the hinge. This allows the degassing device to be adapted to specific requirements with particular precision and flexibility.The hinge proposed here also makes it particularly safe and reliable to prevent the cover element from detaching and moving away from the base element in the event of a fault, i.e., if the predefined internal pressure is exceeded.

[0024] In a possible further development of the present invention, the base element is designed as an injection-molded part. A portion of the hinge, which is attached to the base element, is integrated into the base element or its injection-molded material. The base-element-side portion of the hinge can therefore be either injection-molded or fused into the injection-molded material. This can enable a particularly secure and robust connection between the hinge and the base element, which can also be implemented in a particularly simple, cost-effective, and space-saving manner. In particular, this eliminates the need for additional fasteners and corresponding manufacturing steps.

[0025] In a further possible embodiment of the present invention, the retaining element is designed to be at least partially flexible. Here, the retaining element's maximum length is greater than the distance between the end ends or attachment points of the retaining element on the base element and on the cover element in the ready-to-use state. The retaining element, or its flexible portion, can in particular comprise a rope or the like connecting the base element and the cover element. The term "rope" is to be understood broadly here, i.e., not limited to elements formed from several twisted or braided fibers or wires. The retaining element can therefore, for example, be or comprise a cord, a tape, a wire or cable, a homogeneous or monolithic plastic fiber, and / or the like.Due to the described length of the retaining element, the cover element can detach from or move away from the base element in the event of a malfunction until the retaining element is fully unrolled, extended, or tensioned to its maximum length. The retaining element then prevents the cover element from moving further away from the base element. The embodiment of the present invention, as proposed here, allows the degassing opening to be released particularly quickly and completely in the event of a malfunction, while simultaneously preventing the cover element from being flung further away from the base element than is determined by the predetermined length of the retaining element.

[0026] Another aspect of the present invention is a battery comprising a housing and several battery cells contained therein. The housing has a degassing opening to which a degassing device according to the invention is arranged or which is closed by a degassing device according to the invention. The battery according to the invention can, in particular, be the battery device mentioned in connection with the degassing device according to the invention or correspond to it. Likewise, the battery according to the invention can, for example, comprise several battery modules arranged or contained in the housing, each of which can contain several battery cells, wherein the individual battery modules can then each correspond to the battery device mentioned in connection with the degassing device according to the invention.The battery according to the invention can, in particular, be a high-voltage battery, i.e., have, for example, a nominal voltage of at least 48 V, at least 100 V, at least 200 V, at least 400 V, at least 800 V or more. In particular, the battery cells of the battery according to the invention can have a lithium-based or lithium-ion-based cell chemistry. However, other cell chemistries can also be used. The battery according to the invention can, in particular, be designed as a traction battery for a motor vehicle. Likewise, the battery according to the invention can be designed for other applications or purposes, for example, as a battery for a rail vehicle, as a household or building battery, as a buffer battery for a power supply network, and / or the like.

[0027] Another aspect of the present invention is a motor vehicle comprising a battery according to the invention, in particular a traction battery. The motor vehicle according to the invention may, in particular, be the motor vehicle mentioned in connection with the degassing device and / or the battery according to the invention, or correspond to it. In the intended installation position of the battery in the motor vehicle according to the invention, the degassing device may, in particular when viewed in the vertical direction of the vehicle, be arranged on an underside, i.e., a side of the battery facing a surface driven on by the motor vehicle, or on a side wall of the battery that is at least substantially perpendicular to it, i.e., extending in the vertical and transverse directions of the vehicle.This can enable particularly easy removal of escaping gas or material from the vehicle, as well as the cover element falling back onto the degassing opening after the initial exceedance of the predefined internal pressure.

[0028] Further features of the invention may become apparent from the claims, the figures, and the description of the figures. The features and combinations of features mentioned above in the description, as well as the features and combinations of features shown below in the description of the figures and / or in the figures themselves, can be used not only in the combinations specified, but also in other combinations or on their own, without departing from the scope of the invention.

[0029] The drawing shows in: Fig. 1 a partial schematic sectional view of a battery with a degassing device in a first variant; Fig. 2 a partial schematic sectional view of a battery with a degassing device in a second variant; and Fig. 3 A schematic side view of a motor vehicle with a corresponding battery.

[0030] In the figures, identical and functionally equivalent elements are marked with the same reference symbols. For the sake of clarity, only a representative selection of identical elements is explicitly marked in some cases where multiple instances occur. It should be noted that the figures and the elements and components shown therein are not drawn to scale.

[0031] Fig. Figure 1 shows a partial schematic sectional view of a battery 10 with a cell receiving space 12. A large number of individual battery cells 50 can be placed in the cell receiving space 12 as intended (see Figure 1). Fig. 3) of the battery 10, which are not explicitly shown here for the sake of clarity. A housing of the battery 10, which surrounds or forms the cell receiving space 12, has an opening at one point, at or in which a degassing device 14 is arranged.

[0032] The degassing device 14 has a base element 16, which can also be referred to as the housing or main body of the degassing device 14. The base element 16 can extend, in particular, along an edge of the opening, thus forming, for example, a circular ring corresponding to the shape of the opening, or having a rectangular shape. In any case, the base element 16 can surround a central degassing opening 18, through which, in the event of a fault in the battery 10, for example, in the event of thermal runaway of one of the battery cells 50, gas can escape from the cell receiving chamber 12 into the surrounding area of ​​the battery 10.

[0033] Until such a fault occurs, i.e., during normal, fault-free operation of the battery 10, a cover element 22 rests on a support or outer surface 20 facing away from the cell receiving chamber 12. This cover element 22 completely covers the degassing opening 18. Thus, in the ready-to-use state shown here, the degassing device 14 completely seals the opening in the battery 10 housing. The cover element 22 is designed as a robust, dimensionally stable, or rigid component, for example, as an injection-molded plastic part or the like. Therefore, the cover element 22 can withstand external mechanical stresses without additional protection—unlike, for example, a conventional rupture membrane used to cover the degassing opening 18.

[0034] The cover element 22 is connected to the base element 16 in a watertight and gas-tight manner via a seal 24, for example an elastomer seal.

[0035] The degassing device 14 further comprises a fastening 26 by means of which the cover element 22 is attached to the base element 16. The fastening 26 can be designed, for example, as a releasable snap connection, clip, or the like. The fastening 26 is designed according to a predetermined or predefined internal pressure such that it yields and thus releases the cover element 22 as soon as the predefined internal pressure is reached or exceeded in the cell receiving chamber 12. The predefined internal pressure therefore represents an opening pressure, above which the cover element 22 releases the degassing opening 18, allowing gas to escape from the cell receiving chamber 12. The fastening 26 can, for example, be arranged circumferentially around an inner edge of the base element 16.The fastenings 26 can also be arranged at one or more individual locations, in particular distributed evenly or symmetrically around the degassing opening 18. The load-bearing capacity of the fastening 26 or the cover element 22, and ultimately the internal pressure at which the cover element 22 detaches, can be adjusted by the number of fastenings 26 or corresponding fastening points, or by the length of the fastening 26 or a corresponding fastening area in the circumferential direction along the degassing opening 18 or the inner edge of the base element 16, in addition to the design or configuration of the fastening 26.

[0036] Because the cover element 22 rests on the outer surface 20 and, if necessary, because the cover element 22 is supported in the direction of the cell receiving space 12, for example by the fastening 26, the predefined internal pressure can be lower than a maximum pressure or corresponding maximum external load acting on the cover element 22. In other words, if the predefined internal pressure acting on an inner surface 28 of the cover element 22 facing the battery cells 50 or the cell receiving space 12 of the battery is exceeded, the degassing opening 18 can be released, but until then it remains stable or resistant to external pressures or loads acting on an outer surface 30 of the cover element 22 facing away from the individual cells or the cell receiving space 12.

[0037] To support this, a web 32 extending through the degassing opening 18 can optionally be provided. This web 32 can be part of the base element 16 or attached or supported at two opposing points on the base element 16. The cover element 22 can then be supported on the web 32 by a support 34 in the direction of the cell receiving chamber 12. This further increases the robustness or load-bearing capacity of the cover element 22 against loads acting on the outer surface 30. The support 34 can be attached to or on the web 32 at a support point 36 and on the side of the cover element 22 at an attachment point 38 therein. In particular, the support point 36, viewed longitudinally across the degassing opening 18, can be the midpoint of the web 32. Accordingly, the attachment point 38 can be at least substantially a midpoint or center of the cover element 22.The support 34 can be a separate component, part of the cover element 22, or a feature of the web 32. The support 34 can also serve as a fastening 26 in addition to or as an alternative to the fastening 26 shown. For example, a corresponding detachable connection can be arranged or designed at the support point 36 or at the attachment point 38.

[0038] Likewise, additional or one or more differently positioned supports 34 may be provided to further increase the load-bearing capacity of the cover element 22.

[0039] When the predefined internal pressure in the cell receiving chamber 12 is reached or exceeded, the cover element 22 releases the degassing opening 18 by yielding or failure of the fastening 26. To prevent the cover element 22 from moving away from the base element 16 and the battery 10 in an uncontrolled or unforeseen manner, it is additionally held to the base element 16 by a retaining element 40. The retaining element 40 is designed to withstand the loads that occur even when the predefined internal pressure is exceeded, thus holding the cover element 22 in place even if the battery 10 fails. In the degassing device 14 variant shown here, the retaining element 40 can, for example, be designed as a hinge or include a hinge.

[0040] Fig. 2 shows analogous to Fig. Figure 1 shows a partial schematic cutaway view of the battery 10, where the degassing device 14 is shown here in a second variant. Specifically, a different catching mechanism, i.e., an alternative design of the retaining element 40 for holding or catching the cover element 22 in the event of a fault, i.e., when the degassing opening 18 is released, is provided here. The retaining element 40 comprises a rope or the like, the first end 42 of which is attached to the base element 16 and the second end 44 of which is attached to the cover element 22, in particular to its inner surface 28. Unlike what is shown here, the second end 44 can also be attached to other locations on the cover element 22 and / or the first end 42 to other locations on the base element 16. In any case, the maximum length of the retaining element 40 is greater than a direct connection between the attachment points of the first end 42 and the second end 44.Thus, in the event of a malfunction, the cover element 22 can detach from the base element 16 to expose the degassing opening 18. During this process, the retaining element 40 unrolls or extends and, when fully extended, holds the cover element 22 firmly to prevent it from being flung further away from the base element 16.

[0041] Fig.Figure 3 shows a partial schematic side view of a motor vehicle 46 equipped with the battery 10, in particular as a traction battery. The battery 10 has a battery housing 48 that surrounds the cell receiving space 12 and in which a plurality of battery cells 50 are arranged. The battery 10 also has the degassing device 14, which, in this example, is arranged on a lower side of the battery 10 when viewed in the vertical direction of the vehicle. Depending, for example, on the architecture, arrangement, or size of the battery 10 or the battery housing 48, the module size of any battery modules provided for the battery 10, the housing robustness, the cell format and / or cell chemistry of the battery cells 50, and / or the like, the battery 10 can have one or more degassing devices 14.Such degassing devices 14 can therefore be installed in or on the battery housing 48 and / or on or in module housings of battery modules of the battery 10 in different numbers and / or in different forms or designs.

[0042] For further illustration, a possible open position 52 of the cover element 22 is shown schematically here. In this open position 52, the cover element 22, as described, exposes the degassing opening 18 and is simultaneously held in place by the retaining element 40.

[0043] Overall, the examples described show how a dense bursting element with a hinge or catch mechanism can be implemented for a degassing element of a high-voltage storage device. Reference symbol list 10 batteries 12 cell uptake chamber 14 Degassing device 16 Basic element 18 Degassing opening 20 outdoor area 22 Cover element 24 Seal 26 Fastening 28 Inside 30 Outside 32 Bridge 34 Support 36 Support point 38 Starting point 40 retaining element 42 first end 44 second end 46 Motor vehicle 48 battery cases 50 battery cells 52 Opening position (of the cover element 20) 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] DE 102018210307 A1

[0004]

Claims

[1] Degassing device (14) for a battery device (10) comprising several battery cells (50), comprising a base element (16) surrounding a degassing opening (18) and a cover element (22) which, in a ready-to-use state, is attached to the base element (16) covering the degassing opening (18), wherein - the fastening (26) of the cover element (22) to the base element (16) holds the cover element (22) against a predefined internal pressure acting on an inner surface (28) of the cover element (22) facing the battery cells (50) in the intended installation position and releases the cover element (22) at a greater internal pressure, and - the cover element (22) is additionally connected to the base element (16) by a retaining element (40), by which the cover element (22) is secured against being flung away from the base element (16) when the latter is released due to an exceedance of the predefined internal pressure. [2] Degassing device (14) according to claim 1, characterized by , that the cover element (22) is designed to be stable against pressure loads acting on an outer surface (30) facing away from the battery cells (50) in the intended installation position, which are greater than the predefined internal pressure, and is supported on the base element (16). [3] Degassing device (14) according to any one of the preceding claims, characterized by , that the fastening (26) of the cover element (22) to the base element (16) is designed as a releasable snap connection. [4] Degassing device (14) according to any one of the preceding claims,# characterized by , that the fastening (26) of the cover element (22) is at least partially arranged and / or supported on one side of the base element (16) facing the degassing opening (18). [5] Degassing device (14) according to any one of the preceding claims, characterized bythat the degassing opening (18) is penetrated by a web (32) and the cover element (22), in particular in the middle, is attached or supported on this web (32). [6] Degassing device (14) according to any one of the preceding claims, characterized by , that the retaining element (40) includes a hinge (40) which allows the cover element (22) to be opened relative to the base element (16) away from the degassing opening (18). [7] Degassing device (14) according to claim 6, characterized by , that the base element (16) is designed as an injection-molded part and a part of the hinge (40) attached to it is integrated therein. [8] Degassing device (14) according to any one of the preceding claims, characterized by, that the retaining element (40) is at least partially designed to be flexible, in particular comprising a rope (40) connecting the base element (16) and the cover element (22), and is longer than a distance given in the ready-for-use state between end attachment points (42, 44) of the retaining element (40) on the base element (16) and on the cover element (22). [9] Battery (10) comprising a housing (48) and several battery cells (50) contained therein, wherein the housing (48) has a degassing opening (18) on which a degassing device (14) according to one of the preceding claims is arranged. [10] Motor vehicle (46) comprising a battery (10) according to claim 9, in particular as a traction battery (10).

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