阅读说明：本技术 用于壳体的安全阀以及用于储存电能的储能器 (Safety valve for a housing and energy store for storing electrical energy ) 是由 A·戴恩德尔 于 2018-11-19 设计创作，主要内容包括：本发明涉及一种用于壳体的安全阀(1),该安全阀用于在达到或超过壳体中的规定的破裂压力时释放壳体的壳体开口。在此规定,在安全阀(1)的由弹性体制成的基体(2)中形成有沿周向方向连续的接纳槽(10),该接纳槽用于形状配合地接纳壳体的保持接片。本发明还涉及一种用于储存电能的储能器。(The invention relates to a safety valve (1) for a housing, for releasing a housing opening of the housing when a defined rupture pressure in the housing is reached or exceeded. Provision is made for a receiving groove (10) which is continuous in the circumferential direction and is intended for the form-fitting reception of a retaining web of the housing to be formed in a base body (2) of the safety valve (1) made of an elastomer. The invention also relates to an energy storage device for storing electrical energy.)

1. A safety valve (1) for a housing for releasing a housing opening of the housing when a defined rupture pressure in the housing is reached or exceeded,

it is characterized in that the preparation method is characterized in that,

a receiving groove (10) which is continuous in the circumferential direction and is intended for the form-fitting reception of a retaining web of the housing is formed in a base body (2) of the safety valve (1) made of an elastomer.

2. Safety valve according to claim 1, characterized by a main body (2) in which a pressure relief opening (3) is formed, which is closed by a membrane (5) which is formed integrally and monolithically from the main body (2) and which is designed to rupture at a defined rupture pressure.

3. Safety valve according to one of the preceding claims, characterized in that the receiving groove (10) opens in the radial direction inwards, in particular in the direction of the pressure relief opening (3), or is designed to open in the radial direction outwards, in particular on the side of the safety valve (1) facing away from the pressure relief opening (3).

4. Safety valve according to any of the preceding claims, characterized in that the retaining tab is designed in the form of an edge of a housing opening formed in a wall of the housing or in the form of a form-fitting projection of a receiving nipple of the housing.

5. Safety valve according to one of the preceding claims, characterized in that the receiving groove (10) is delimited, as seen in a longitudinal section of the safety valve (1), on the one hand by a first web (11) and, on the other hand, by a second web (12) arranged at a distance from the first web (11), wherein the webs (11, 12) project from the base body (2), and in that a rising ramp (13) is designed on the first web (11) on its side facing away from the receiving groove (10), so that the first web (11) springs open elastically when the safety valve (1) is pressed into the housing opening or when it is pressed onto the receiving nipple.

6. Safety valve according to one of the preceding claims, characterized in that the sealing web (8) is connected to the second web (12) or the sealing web (8) is arranged on the side of the base body (2) facing away from the second web (12), wherein the sealing web (8) covers the receiving groove (10) and/or the first web (11) at least partially, viewed in longitudinal section.

7. Safety valve according to one of the preceding claims, characterized in that a plurality of elastically deformable closing elements (4) are arranged in the pressure relief opening (3), which closing elements close the pressure relief opening (3) in a closed position and release it in a second position for throughflow, wherein the closing elements (4) are connected to one another in the first position by means of a membrane (5) and are held in the first position.

8. Safety valve according to one of the preceding claims, characterized in that each of the closing elements (4) has two elastically interconnected webs (6, 7) on the side facing away from the base body (2), which webs merge into one another in the direction of the base body (2).

9. Safety valve according to any of the preceding claims, characterized in that each of the tabs (6, 7) in the first position abuts against one of the tabs (7, 6) of the other of the closure elements (4) and is connected thereto by a diaphragm (5).

10. Energy storage device for storing electrical energy, having at least one cell arranged in a closed housing and a safety valve (1) arranged in a housing opening of the housing for releasing the housing opening of the housing when a defined rupture pressure in the housing is reached or exceeded, in particular a safety valve (1) according to one or more of the preceding claims,

it is characterized in that the preparation method is characterized in that,

a receiving groove (10) which is continuous in the circumferential direction and is intended for the form-fitting reception of a retaining web of the housing is formed in a base body (2) of the safety valve (1) which is made of an elastomer.

Technical Field

The invention relates to a safety valve for a housing, which is used to release a housing opening of the housing when a defined rupture pressure in the housing is reached or exceeded. The invention also relates to an energy storage device for storing electrical energy.

Background

The document EP 1321993B 1 is known from the prior art, for example. This document relates to a battery safety valve including a valve plate having a thickness, a rupture groove formed on the valve plate, and one or more rupture auxiliary grooves located in an inner region of the rupture groove, wherein the rupture auxiliary groove includes a configuration in which a remaining thickness of the valve plate on the rupture auxiliary groove is greater than a remaining thickness of the valve plate on the rupture groove, and at least one end of the rupture auxiliary groove is connected to the rupture groove. It is provided that the rupture groove formed in the valve plate is an annular rupture groove, and the bottom section of the rupture auxiliary groove of the valve plate is wider than the bottom section of the rupture groove of the valve plate.

Furthermore, a bursting device is known from DE 102015221738 a1, which is suitable for bursting under pressure, having a bursting disc, wherein the bursting disc has at least one bursting gap for bursting under pressure, wherein the at least one bursting gap is produced by means of a cutting device, wherein the bursting disc has at least one calibration gap, which is different from the bursting gap, for calibrating the cutting device.

Disclosure of Invention

The object of the invention is to provide a safety valve for a housing, which has advantages over known safety valves, in particular is easy to manufacture and easy to mount on the housing.

According to the invention, this object is achieved by a safety valve for a housing having the features of claim 1. In this case, provision is made for a receiving groove which is continuous in the circumferential direction and is intended for the form-fitting reception of the retaining webs of the housing to be formed in the base body of the safety valve made of an elastomer.

The safety valve serves for fluid-tight closure of the housing or of a housing opening of the housing. The safety valve is designed such that it closes the housing or the housing opening in a fluid-tight manner when the pressure prevailing in the housing is less than the cracking pressure. However, if the pressure in the housing reaches or exceeds the cracking pressure, the safety valve opens and a flow connection is established between the housing interior space of the housing and the environment outside the housing. The pressure prevailing in the housing can be correspondingly relieved via the safety valve.

The housing is, for example, a component of an energy store for storing electrical energy. Accordingly, at least one battery cell, which is designed, for example, as a lithium-ion battery cell, is arranged in the housing. Preferably, a plurality of such battery cells are arranged in the housing. The battery cells are protected from external influences, such as moisture and/or mechanical forces, by the housing. For this purpose, the housing is designed to be sealed or at least substantially sealed.

In order to compensate for the pressure difference between the internal pressure in the housing interior and the ambient pressure in the external environment, the housing can have at least one pressure compensation element. The pressure equalization element may equalize pressure differences, for example caused by temperature fluctuations or different ambient pressures. Such a pressure equalization element has, for example, at least one deformable or compressible element. However, the pressure compensation element is preferably hermetically closed or arranged in a sealed housing.

If a sudden and/or strong pressure increase of the internal pressure occurs in the housing, for example due to mechanical damage of the battery cells, strong heating, overcharging or the like, this pressure increase can no longer be compensated purely by the pressure compensation element or a very large number of pressure compensation elements may be required. In order to prevent uncontrolled degassing or even the rupture of the housing despite the pressure increase, a safety valve is provided. In principle, a rupture element can be used as a safety valve.

The safety valve according to the invention has, for example, a main body, in which a pressure relief opening is formed. The pressure relief opening is first closed with a membrane. The membrane is formed integrally and materially integrally with the base. The diaphragm is configured such that it ruptures once the internal pressure in the housing reaches a rupture pressure. The bursting pressure is given here in the form of a relative pressure, i.e. in the form of a relative pressure with respect to the ambient pressure. Instead of a burst pressure, a burst pressure difference may also be used, the diaphragm rupturing when the pressure difference between the internal pressure and the ambient pressure reaches or exceeds the burst pressure difference.

In addition to the design of the safety valve with a diaphragm, an alternative can also provide that the safety valve as a whole falls off the housing as soon as the cracking pressure is reached or exceeded. In this case, the base body and the receiving groove in the base body are designed such that the form-fitting connection with the housing is released as soon as the bursting pressure is reached. The safety valve is also designed such that it is displaced out of the housing opening by the pressure prevailing in the housing when the connection is released.

In order to be able to fix the safety valve to the housing in a simple and rapid manner, it is provided in any case that a receiving groove is formed in the base body for the positive reception of a retaining web of the housing. In other words, a form-fitting fixing of the safety valve or the safety valve base body on the housing is provided. In this connection, the safety valve can be fixed in the housing in a simple manner by being slipped onto the housing or by being inserted into an opening of the housing.

In order to be able to easily install or introduce the safety valve, the base body is designed elastically and is formed from an elastomer for this purpose. Since in the embodiment of the safety valve with a membrane, the membrane is formed integrally and of a uniform material with the base body, the membrane is also formed from an elastomer, i.e. the same elastomer as the base body. Preferably, the entire safety valve, independently of the remaining design, is integrally and materially integrally formed, i.e. integrally made of an elastomer. This makes it possible to produce the safety valve particularly simply and cost-effectively, for example by injection molding or the like.

The elasticity of the base body on the one hand allows simple insertion of the retaining webs of the housing into the receptacles in order to positively fix the safety valve on the housing. On the other hand, the elasticity of the base body ensures a reliable sealing of the housing or housing opening. For this purpose, the receiving groove is preferably dimensioned smaller than the retaining web, so that the base body is continuously pressed onto the housing, in particular onto the retaining web, after it has been mounted on the housing, due to its elasticity. In this respect, no additional measures need to be taken to seal the housing after the safety valve has been mounted in or on the housing opening.

On the one hand, the safety valve can be produced at very low cost, since it preferably consists of one single part, for example produced by injection molding. On the other hand, a simple mounting of the safety valve on the housing is also achieved, since a simple insertion onto or into the housing is sufficient to fix the safety valve on the housing in a reliable and sealed manner at the housing opening.

In a development of the invention, the elastomer is designed as EPDM. Ethylene-propylene-diene rubbers (EPDM) are particularly suitable for sealing. The ethylene-propylene-diene rubbers are characterized by a high resistance to external influences and high temperatures. The use of such ethylene-propylene-diene rubber for forming the matrix and the membrane ensures excellent service life of the safety valve.

A preferred embodiment of the invention provides that the base body has a pressure relief opening formed therein, which is closed by a diaphragm formed integrally and monolithically from material with the base body, and which is designed to rupture at a predetermined rupture pressure. This has already been indicated above. This embodiment enables a particularly precise definition of the bursting pressure.

In the context of a further embodiment of the invention, it can be provided that the receiving groove opens in the radial direction inwardly, in particular in the direction of the pressure relief opening, or is designed to open in the radial direction outwardly, in particular on the side of the safety valve facing away from the pressure relief opening. In the former case, the receiving groove is therefore open in the radial direction inwardly with respect to the longitudinal center axis of the safety valve or the pressure relief opening and in the latter case outwardly.

The inward-opening embodiment of the receiving groove enables, for example, the safety valve to be slipped onto a receiving socket of the housing, which has a retaining web pointing outward in the radial direction. This embodiment is advantageous, in particular, in that it is particularly simple to install, since the base body expands outward in the radial direction when the safety valve is installed on the receiving socket. In this respect, only a small mounting force is required for mounting the safety valve.

If the receiving groove opens outward in the radial direction, the safety valve is preferably provided for insertion into a housing opening of the housing. In this case, the retaining tab is in the form of an edge of the housing opening. In this embodiment of the safety valve, the base body is deformed inward in the radial direction during the installation of the safety valve. For this reason, a greater mounting force needs to be applied than in the aforementioned embodiments. Conversely, however, a better sealing of the housing opening is also achieved by the safety valve.

A further preferred embodiment of the invention provides that the retaining webs are in the form of edges of the housing opening formed in the housing wall or in the form of form-fitting projections of the housing which receive the adapter. This has already been indicated above. In the case of the embodiment of the safety valve, the edge of the housing opening, which is formed edge-closed in the housing, preferably serves as a retaining tab, in which embodiment the receiving groove opens in a direction away from the pressure relief opening. In addition to the advantages already mentioned, this variant is advantageous in that it is a simple design of the housing, since only a housing opening can be formed in the housing wall. Alternatively, the retaining webs can be formed on the receiving socket of the housing and be present there in the form of form-fitting projections. The form-fitting projection preferably completely surrounds the receiving socket in the circumferential direction, i.e. is formed continuously, in order to achieve a secure and sealed fit of the safety valve on the housing.

In a development of the invention, the receiving groove, as viewed in longitudinal section of the safety valve, is delimited on the one hand by a first web and on the other hand by a second web arranged at a distance from the first web, wherein the webs project from the base body, and wherein the first web is designed with an ascending slope on its side facing away from the receiving grooveSo that the first web springs out elastically when the safety valve is pressed into the housing opening or when the safety valve is pressed onto the receiving socket.

The receiving groove is delimited by two webs, namely a first web and a second web, as viewed in the axial direction with reference to the longitudinal center axis. The two webs are arranged at a distance from one another, in particular they run parallel or at least approximately parallel to one another. The tabs project from the base body, i.e. are connected to one another via the base body, preferably only via the base body.

The distance between the webs is preferably dimensioned such that, after the insertion of the retaining web into the receiving groove, the first web bears on the one hand against the retaining web and the second web also bears against the retaining web. Preferably, in the relaxed state of the safety valve, the distance between the webs is smaller than the extension of the retaining webs in the axial direction, so that after the safety valve is mounted on the housing, the retaining webs are held in a clamped manner between the webs.

In order to simplify the introduction of the retaining webs into the receiving groove, a rising ramp is provided on one of the webs, i.e. the first web. The rising ramp faces away from the receiving groove, viewed in the axial direction, so that the retaining web elastically deflects the first web when the safety valve is installed. In this respect, an extremely simple mounting of the safety valve on the housing is ensured.

A further embodiment of the invention provides that the sealing web is connected to the second web or that the sealing web is arranged on the side of the base body facing away from the second web, wherein the sealing web covers the receiving groove and/or the first web at least partially, as viewed in longitudinal section. The sealing tab is used to seal the housing opening after installation of the safety valve. The sealing web is designed in particular such that, after the safety valve has been mounted on the housing, it rests against a wall of the housing, wherein the wall has a housing opening or receives the connecting piece.

The sealing web can, for example, be connected directly to the second web or extend radially outward from the second web. Alternatively, it is of course also possible for the sealing web to originate from the base body. However, the sealing webs also preferably extend outward in the radial direction. In particular, in the case of the former, it is provided that the sealing web at least partially covers the receiving groove and/or the first web in the axial direction.

Preferably, the sealing tab completely covers the receiving groove and at least partially covers the first tab. When the safety valve is mounted on the housing, the sealing web is correspondingly elastically deflected by the housing, so that it then bears securely and sealingly against the housing or the housing wall. If the sealing web is arranged on the side of the base body facing away from the second web, the sealing web preferably completely covers the first web, as viewed in the axial direction. The sealing webs are preferably formed continuously in the circumferential direction in order to achieve a particularly good sealing effect.

A further embodiment of the invention provides that a plurality of elastically deformable closing elements are arranged in the pressure relief opening, which closing elements close the pressure relief opening in the closed position and release the pressure relief opening in the second position to allow through-flow, wherein the closing elements are connected to one another by means of a membrane in the first position and are held in the first position. In this connection, the pressure relief opening is not only closed by the membrane. Rather, a closing element is additionally provided, which can be at least partially elastically deformed. Preferably, the closing element is formed elastically deformable on the base body or projects from the base body.

In the first position, the closing elements lie against one another in such a way that they completely close the pressure relief opening. The membrane holds the closing elements together and in the first position. On the one hand, the diaphragm ensures that the closing element remains in the first position as long as the internal pressure is less than the bursting pressure. On the other hand, if the closing elements do not bear completely sealingly against one another, the membrane eliminates the flow path remaining between the closing elements.

In other words, the membrane serves not only to close the pressure relief opening in a fluid-tight manner, but also to hold the closing element in the first position, wherein the closing element can contribute to or at least contributes to the fluid-tight closing of the pressure relief opening. The closing element preferably has a substantially larger wall thickness than the membrane, in particular a wall thickness of the closing element which is at least 2 times, at least 3 times, at least 4 times, at least 5 times, at least 10 times, at least 25 times, at least 50 times or at least 100 times the wall thickness of the membrane.

The closing element is designed and arranged on the base body in such a way that, after the diaphragm has broken, fluid escaping from the housing can press the closing element in the direction of the second position. However, the closing element is elastically designed in such a way that the elasticity of the closing element presses the closing element in the direction of the first position. After the fluid has escaped from the housing and a pressure equalization has accordingly been established, the closing element is preferably in this respect again in the first position, in which it closes the pressure relief opening. However, as a result of the rupture of the membrane, the closing element now releases the pressure relief opening at an opening pressure which is significantly lower than the rupture pressure. The described design of the safety valve has the advantage that a certain tightness of the housing is ensured even after the diaphragm has broken.

In a further embodiment of the invention, each of the plurality of closing elements has two elastically interconnected webs on the side facing away from the base body, which webs merge into one another in the direction of the base body. These tabs are angled with respect to one another, for example perpendicular, on their sides facing the base body. The closing element is substantially V-shaped in this respect. The wall thickness of the webs increases in the direction of the base body, preferably continuously, so that the webs merge into one another in the direction of the base body and merge together into the base body. This design ensures that the pressure relief opening is reliably released when the membrane breaks. At the same time, sufficient elasticity of the closing element is achieved in order to transfer or press the closing element into the first position again after pressure equalization.

In a further preferred embodiment of the invention, each of the webs in the first position abuts against one of the webs of the other of the closure elements and is connected thereto via the membrane. The webs of the two closing elements are arranged substantially parallel to one another in the first position and are connected to one another by the membrane. This embodiment can be produced particularly easily by injection molding. For example, safety valves are produced in the manner of hose spouts, wherein, in contrast to this, the membrane is not removed after production. This makes it possible to manufacture the safety valve particularly simply and cost-effectively.

Finally, it can be provided within the scope of a preferred embodiment of the invention that the safety valve is provided as an injection-molded part. As already explained, this allows a particularly simple and cost-effective production of the safety valve.

The invention also relates to an energy store for storing electrical energy, having at least one cell arranged in a closed housing and a safety valve arranged in a housing opening of the housing for releasing the housing opening of the housing when a defined rupture pressure in the housing is reached or exceeded, in particular a safety valve according to an embodiment within the scope of the present description. In this case, provision is made for a receiving groove which is continuous in the circumferential direction and is intended for the form-fitting reception of the retaining webs of the housing to be formed on a base body of the safety valve made of an elastomer.

The advantages of this design of the safety valve or accumulator have already been pointed out. Both the energy accumulator and the safety valve can be modified according to embodiments within the scope of the present description, so that reference is made to these embodiments in this respect.

Drawings

The invention will be elucidated in detail below on the basis of embodiments shown in the drawings without limiting the invention.

The figures show that:

figure 1 shows a schematic view of a first embodiment of a safety valve for a housing,

figure 2 shows a schematic cross-sectional view of a first embodiment of the safety valve,

figure 3 shows a schematic view of a second embodiment of the safety valve,

figure 4 shows a schematic view of a third embodiment of the safety valve,

fig. 5 shows another schematic view of a third embodiment of the safety valve.

Fig. 6 shows a schematic view of a fourth embodiment of the safety valve.

Detailed Description

Fig. 1 shows a schematic view of a first embodiment of a safety valve 1 for a housing. The safety valve 1 has a main body 2, in which a pressure relief opening 3, which is not visible here, is formed. In the exemplary embodiment shown here, a plurality of closing elements 4, for example four closing elements 4, project from the base body 2. The closing element 4 is formed integrally and materially integrally with the base body 2. The closing element 4 is shown in a first position, in which it closes the pressure relief opening 3. In the first position, the closing element is connected to a membrane 5, which is integrally and materially integrally formed with the closing element and thus with the base body 2.

The membrane 5 holds the closing element 4 in the first position, that is to say firstly prevents the release of the pressure relief opening 3 by the closing element 4. The diaphragm 5 is designed such that it ruptures at a defined rupture pressure, so that the closure element 4 is then allowed to shift from the first position in the direction of the second position, in which the pressure relief opening 3 is released.

It can be seen here that the closing elements 4 are each formed by two elastically interconnected webs 6 and 7, which are angled relative to one another, so that each of the closing elements 4 has a substantially V-shape. The webs 6 and 7 of each of the closing elements 4 are connected to one another elastically and merge into one another in the direction of the base body 2. The membrane 5 is designed on the safety valve in such a way that, in the first position of the closing element 4, each web 6 is connected to the respectively adjacent web 7 of the respective closing element 4.

In order to achieve a sufficient sealing of the housing by means of the safety valve 1, the safety valve 1 has a sealing web 8 which is formed continuously in the circumferential direction with reference to a longitudinal center axis 9, not shown here, of the safety valve 1. The sealing web 8 forms a sealing ring in this case.

Fig. 2 shows a schematic longitudinal section through the safety valve 1 along the longitudinal mid axis 9. It can be seen that a receiving groove 10 which is continuous in the circumferential direction and is intended for the form-fitting reception of a retaining web of the housing is formed in the main body 2. The receiving groove 10 is located between the first tab 11 and the second tab 12. The webs 11 and 12 are formed by the base body 2 and in the embodiment shown here project in a direction away from the pressure relief opening 3. The webs are arranged and designed in such a way that the receiving groove 10 opens in a direction facing away from the pressure relief opening 3.

It can clearly be seen that the first web 11 has a rising slope 13, which enables a simple assembly of the safety valve 1, since the first web 11 is displaced inward in the radial direction by the retaining web of the housing when the safety valve 1 is assembled, until the retaining web reaches the receiving groove 10. It can furthermore be seen that the sealing web 8 in the exemplary embodiment shown here protrudes from the second web 10, i.e. extends outward in the radial direction. The sealing web 8 is arranged and oriented in such a way that it, viewed in the axial direction, completely extends through the receiving groove 10 and at least partially covers the first web 11. This embodiment of the sealing web 8 ensures that: the sealing web 8 rests reliably and sealingly against the housing or against the wall of the housing after the safety valve 1 has been mounted on the housing.

Fig. 3 shows a schematic view of a second embodiment of the safety valve 1. This second embodiment is substantially similar to the above-described embodiment, so reference may be made to the above-described embodiment, and only the differences will be described below. The difference is that the receiving groove 10 is no longer open in the direction away from the pressure relief opening 3, but in the direction of the pressure relief opening 3. Accordingly, the safety valve 1 shown here is designed in a second embodiment for application to a receiving socket of a housing, wherein the retaining tab is designed on the receiving socket. Furthermore, the sealing tab 8 is not present, but may of course alternatively be formed. The working principle of the second embodiment of the safety valve 1 is the same as or at least substantially the same as the safety valve 1 according to the first embodiment.

Fig. 4 shows a schematic cross-sectional view of a third embodiment of the safety valve 1. In principle, reference is again made to the above-described embodiments, and only differences are indicated below. The difference is that instead of the closing element 5, only one closing element 14 is present, which is connected to the base body 2, in particular the second web 12, via the membrane 5. As in the second embodiment described above, the receiving groove 10 opens in the radial direction inwardly, i.e. in the direction of the pressure relief opening 3.

The sealing web 8, which is again provided, extends outward in the radial direction, i.e. protrudes from the base body 2. The sealing web extends completely past the first web 11 in the axial direction in order to ensure that the sealing web 8 rests reliably against the housing or the housing wall. Of course, the orientation of the safety valve 1 of the fourth embodiment with respect to the receiving groove 10 may also be alternatively configured similarly to the first embodiment, so that the receiving groove 10 is open to the outside in the radial direction. In this case, the tabs 11 and 12 are also constructed according to an embodiment corresponding to the first embodiment.

Fig. 5 shows a further schematic view of a third embodiment of the safety valve 1. It can be seen that the membrane 5 does not completely, but only partially, surround the closing element 14 in the circumferential direction. The closing element is thereby connected to the base body 2 in the hinge region 15 independently of the membrane 5, in particular elastically pivotably connected in a (hinge) mounted manner. When the membrane 5 ruptures as a result of the rupture pressure being reached, the closing element 14 does not detach completely from the base body 2 but remains on this.

Thus, on the one hand, the loss of the closing element 14 is reliably prevented and, on the other hand, damage to other elements or injury due to detachment of the closing element 14 is reliably prevented. For example, the membrane 5 surrounds the closing element in the circumferential direction at a circumferential angle of at least 315 °, at least 330 ° or at least 345 °, and the hinge region correspondingly surrounds the closing element at a circumferential angle of at most 45 °, at most 30 ° or at most 15 °.

Fig. 6 shows a fourth embodiment of the safety valve 1. With regard to the orientation of the receiving groove 10, this corresponds to the first embodiment, so that reference is made in principle to the corresponding embodiment. Alternatively, it is of course also possible according to the second and third embodiments to realize an inward orientation of the receiving groove 10 in the radial direction. Reference is also made to the corresponding embodiments for this purpose.

Unlike the other embodiments, however, the fourth embodiment does not have a pressure relief opening 3, a closing element 4 or a closing element 14, and also does not have a membrane 5. More precisely, the safety valve 1 is inserted in the manner of a plug into the housing opening, where it is held by the receiving groove 10 or the interaction of the webs 11 and 12 and the retaining web. The sealing web 8 bears sealingly against the housing, so that an excellent seal is produced.

When the bursting pressure is reached or exceeded, the base body 2 is elastically deformed in such a way that the positive-fit connection is released. Accordingly, the bursting pressure can displace the safety valve 1 as a whole out of the housing opening. The safety valve 1 can in principle have any desired shape, as seen in cross section. Preferably, however, the safety valve is circular or oval.

The design of the safety valve 1 is characterized on the one hand by its cost-effective production and on the other hand by its simple and tight mounting on the housing. At least the base body 2, the closing elements 4 and 14 and the membrane 5 are made of an elastomer, preferably EPDM. Particularly preferably, the entire safety valve 1 is made of an elastomer. The safety valve 1 can be present as an injection-molded part, that is to say formed by injection molding. This ensures a particularly simple and cost-effective production of the safety valve 1.