DE102021128942A1 - Degassing unit and electronics housing with a degassing unit - Google Patents

Abstract

The invention relates to a degassing unit (10) for an electronics housing, in particular for a battery housing, in particular for a traction battery in a motor vehicle, having a base body (12), a closure element (44) and a particle separating device (30), the base body (12) being fluid-tight can be connected to an edge of a pressure equalization opening (68) of the electronics housing (18) and has at least one gas passage opening (46), and wherein a closure body (44) when a predetermined pressure difference between an interior (14) of the electronics housing (18) and an environment is exceeded (16) of the electronics housing (18) can be deflected from a position in the normal operating state by opening the gas passage opening (46) in order to convert the degassing unit (18) into an emergency degassing state, the gas passage opening (46) being located on one of the interior spaces (14) of the A particle separating device (30) is arranged upstream of the flow path (54) leading to the environment and has at least one separating element (28a, 28b) with a mesh size (42) of at most 1.0 mm. The invention also relates to an electronics housing (18) with such a degassing unit (10).

Description

technical field

The invention relates to a degassing unit for an electronics housing, which has a base body that can be connected to an edge of a pressure equalization opening in the electronics housing and a sealing body for a gas passage opening in the base body. The invention also relates to an electronics housing with such a degassing unit.

State of the art

Electronics housings, such as battery housings, are often provided with a pressure equalization device in order to allow pressure equalization between an interior of the electronics housing and an environment. If the electronics housing were hermetically sealed, pressure differences between the interior and the environment could build up during operation of the electronics housing or a device arranged in the electronics housing, for example an electrochemical energy storage device. Because the pressure equalization device enables pressure equalization, it is avoided that the electronics housing fails mechanically during operation, for example by the electronics housing bulging inwards or outwards or finally bursting.

In the case of batteries or accumulators, in particular in the case of high-voltage storage devices such as those used as traction batteries in electric vehicles, battery cells can fail, which leads to a sharp increase in pressure and temperature in the interior of the electronics housing. In order to prevent the electronics housing from bursting, the hot and highly pressurized gas must be discharged quickly from the interior of the electronics housing to the environment.

Out of WO 2011/161512 A1 a pressure relief valve for a container, such as for a motor vehicle battery, is known, which can be arranged on such a container via a seal. The pressure relief valve allows gas to be exchanged between the interior of the housing and the environment via a permeable membrane. In the event of a sudden increase in pressure, the overpressure valve is designed to release a flow path, bypassing the membrane, by raising a closure means during the overpressure period.

In DE 10 2019 100 094 A1 describes a degassing unit for an electronics housing which has a base body which can be connected in a fluid-tight manner to an edge of a pressure equalization opening of the electronics housing and has at least one gas passage opening which is covered by a membrane when the degassing unit is in a normal operating state. The membrane is fastened in a fluid-tight manner on a membrane carrier, which can be displaced relative to the base body and which, in the normal operating state, is pressed in a sealing manner by an axial force against an edge of the gas passage opening of the base body, so that when a predetermined pressure difference between an interior space and an environment is exceeded, the membrane carrier releases a die Membrane immediate emergency degassing opening can be lifted from the base body.

After an emergency degassing process, the two aforementioned pressure compensation devices or degassing units return to the normal operating state in that the pressure relief valve closes or the membrane carrier is pressed against the edge. A gas exchange between the environment and the interior is therefore still possible through the gas passage opening. If the emergency degassing process was carried out due to a battery cell defect, oxygen from the environment can get into the interior of the electronics housing. This can promote the development or spread of a fire from a defective battery.

In addition, in practice, if the battery cells fail, very small parts, fragments, splinters or particles are often produced. With emergency degassing, such impurities are transported in the escaping gas flow and are deposited at the emergency degassing opening. In addition, the impurities get into the environment during the emergency degassing process, which also leads to environmental pollution.

It is an object of the invention to improve the operational reliability of electronics housings after an emergency degassing process.

Disclosure of Invention

The object is achieved by a degassing unit having the features specified in claim 1 and an electronics housing according to claim 17. Preferred embodiments are specified in the respective subclaims and the description.

Degassing unit according to the invention

According to the invention, a degassing unit is provided for an electronics housing, in particular for a battery housing, in particular for a traction battery of a motor vehicle. The degassing unit has a base body, a Closure body and a particle separator.

The base body can be in one piece or in several parts. The base body is preferably made of a heat-resistant and pressure-resistant material, in particular metal. The base body is particularly preferably designed as a deep-drawn sheet metal part. The base body of the pressure equalization device can typically be connected in a fluid-tight manner to an edge of a pressure equalization opening in the electronics housing. In other words, the degassing unit can be arranged on the housing wall of the electronics housing and/or inserted into the housing wall of the electronics housing without a fluid, in particular gas, being able to flow through between the base body and the housing wall.

The base body has at least one gas passage opening. The gas passage opening is arranged on the pressure equalization opening when the degassing unit is arranged on the electronics housing. The gas passage opening can be arranged in the pressure equalization opening or subsequent to the pressure equalization opening. In other words, a flow path through which a fluid can flow runs through the pressure compensation opening and the gas passage opening.

The closure body is designed to close the flow path by covering the gas passage opening. The position of the closure body in relation to the base body or the gas passage opening can be changed, in particular slidably. Typically, the closure body is in the form of a flat, round disc. The closure body is preferably made of a heat-resistant and pressure-resistant material, in particular metal.

The particle separation device is located in front of the gas passage opening on the flow path leading from the interior of the electronics housing into the environment. In other words, gas from the interior of the electronics housing first flows through the particle separator and then through the gas passage opening. The particle separation device is designed to separate impurities. For this purpose, the particle separation device has at least one separation element. In this way, according to the invention, it is possible to prevent impurities from being deposited on the gas passage opening or on the contact point between the base body and the closure body as it flows out. This prevents the closure body from being blocked by impurities and enables the gas passage opening to be tightly closed by the closure body. Furthermore, the contamination is prevented from escaping into the environment. The separating element, in particular the entire particle separating device, is preferably made of a heat-resistant and pressure-resistant material, in particular metal.

The separating element according to the invention is preferably positioned on the flow path within the degassing unit. The separating element can be arranged or formed on the degassing unit, in particular on the base body. The separating element basically extends over the entire flow cross section and has meshes that divide the flow cross section into partial flow cross sections.

The meshes have a mesh size that is decisive for the size of the impurities to be separated. The meshes preferably have different main dimensions. In particular, the meshes can be rectangular, slot-shaped or oval. The mesh size then represents the smallest flow diameter (the smallest main dimension) within an associated mesh. Preferably, a remaining flow diameter of a mesh (a largest main dimension) can have at least twice, particularly preferably at least five times, the mesh size. This favors a low flow resistance of the separating element with a high separating rate at the same time.

According to the invention, the separating element has a mesh size of at most 1.0 mm, preferably at most 0.9 mm. This mesh size is very effective for retaining fragments of failing batteries without unduly increasing drag. In particular, contaminants such as electronic elements or electronic fragments, in particular battery fragments, can be effectively separated in this way.

Typically, the mesh width of the meshes of a separating element is predominantly uniform. Preferably at least 60%, particularly preferably at least 80%, of the meshes of a separating element have the same mesh size. This achieves homogeneous separation over the entire cross section of the separation element.

The meshes are preferably predominantly rectangular or slot-shaped. In other words, the meshes preferably release a partial flow cross section that is predominantly rectangular or in the form of a slot. This favors the simple manufacture of the separating elements.

According to the invention, the degassing unit can assume a normal operating state. The normal operating state is determined by the position of the closure body in relation to the base body when the electronics housing is operating properly. In the normal operating state, the closure body is in its initial position.

A possible normal operating state of the degassing unit can be that the flow path between the base body and the closure body is open (open normal operating state). In other words, in this normal operating state, the closure body does not seal the main body through which air can flow or the gas passage opening. In this case, the gas passage opening in the base body, which is in the flow path, is typically covered by a membrane. The membrane is preferably selectively permeable. In principle, the membrane is permeable to gases. The membrane is preferably impermeable to liquids and solids. In the normal operating state, the membrane can prevent or at least reduce the entry of water into the housing. In this normal operating state, a (gas) flow can take place through the base body along the flow path.

An alternative possible normal operating state of the degassing unit can consist in the flow path between the base body and the closure body being closed (closed normal operating state). In other words, in this case the closure body sealingly closes the main body through which air can flow or the gas passage opening in the normal operating state. Entry of gas and/or water into the housing can be prevented. In this normal operating state, a (gas) flow through the base body cannot take place along the flow path. For a degassing process at a defined pressure difference, the closure body can temporarily release a flow through the gas passage opening along the flow path. In embodiments, pressure peaks that occur inside the housing during normal operation can thus be quickly reduced without the degassing unit going into the emergency shut-off state as a result.

When a predetermined pressure difference (which is greater than the pressure differences that occur during normal operation) between an interior of the electronics housing and an area surrounding the electronics housing is exceeded, the degassing unit changes to an emergency degassing state. During an emergency degassing process in the emergency degassing state, the closure body is initially deflected from its position in the normal operating state due to the increased gas pressure in the interior of the electronics housing, or is further spaced from the gas passage opening of the base body. In other words, the gas passage opening or the flow path is opened or widened by lifting the closure body from the gas passage opening. In the emergency degassing state, the closure body is deflected from the position in the normal operating state.

During the emergency degassing state, gas flows out of the interior of the electronics housing into the environment. The escaping gas typically contains impurities, for example particles or very small elements from electronic elements, in particular batteries, in particular traction batteries in motor vehicles, which have arisen as a result of an electronic defect, in particular a battery defect, due to the destruction of the electronic elements, in particular the batteries.

According to the invention, the degassing unit is set up to switch to an emergency closure state after an emergency degassing process, in which the closure body closes the gas passage opening of the base body. The degassing unit is switched to the emergency closure state in that the closure body is moved back after the emergency degassing process when the pressure difference between an interior space of the electronics housing and an environment of the electronics housing falls below a predetermined level such that the closure body closes the gas passage opening.

The predetermined pressure difference at which the closure body is shifted back to convert the degassing unit from the emergency degassing state to the emergency closure state can differ from the predetermined pressure difference at which this is converted from the normal operating state to the emergency degassing state by moving the closure body. In particular, dynamic pressure components, which are caused by the flow occurring during the emergency degassing process, sometimes play a major role when the closure body is moved back from the emergency degassing state to the emergency closing state.

If, after the emergency degassing process has taken place, the predetermined pressure difference for transferring the degassing unit from the emergency degassing state to the emergency closing state is fallen below once, the closure body goes into the emergency closure state and remains there, of course, even when there is no longer any pressure difference acting on it. However, the degassing unit can continue to quickly reduce any subsequent pressure peaks by temporarily opening the closure body again at a defined pressure difference.

In other words, in the emergency closure state, the closure body prevents flow through the base body or the gas passage opening and thus the degassing unit. Because the closure body closes the base body impermeably or tightly in the emergency closure state, entry of oxygen - whether in the form of molecular oxygen from the ambient air or in the form of gaseous or liquid water - through the degassing unit is prevented after the emergency degassing process is complete. A fire that is developing or has already started in the electronics housing is thus cut off from the supply of the oxidizing agent required for combustion. The outbreak of the fire can thereby be avoided or the resulting fire can be brought to a standstill.

In other words, the degassing unit according to the invention has a valve arrangement which is connected in series with the pressure compensation opening and is formed with the closure body. In the normal operating state, the valve arrangement can be open, i.e. flow-through, or closed, i.e. flow-blocked. The valve arrangement is open during an emergency degassing process. In versions in which the valve arrangement is closed during normal operation, the valve arrangement can be opened when exposed to typical pressures occurring during operation in order to reduce pressure peaks occurring inside the housing without the degassing unit thereby going into the emergency closing state.

The particle separation device is set up to separate impurities contained in the outflowing fluid, which could prevent a sealing closure of the gas passage opening by the closure body in the emergency closure state. In the emergency closing state, which is set up automatically by the degassing unit according to the invention after the end of the emergency degassing process, the valve arrangement cannot be flowed through. In the emergency closure state, the base body or the gas passage opening is tightly closed by the closure body.

The emergency degassing process is typically characterized by a large volume flow, high pressure and/or high temperature of the outflowing gas. The membrane can be destroyed during the emergency degassing process. Since the closure element tightly closes the base body after the emergency degassing process has been completed, there is still no risk of gases, liquids or solids getting into the housing.

The closure body is preferably prestressed against the base body. Preferably counter to the direction of the flow path leading from the interior of the battery housing into the environment in the assembled state.

As a result, the sealing of the base body in the emergency closure state can be ensured particularly reliably by the closure body. A spring element can be provided in order to prestress the closure body against the base body. The spring element can be a preferably cylindrical helical spring. The spring element can be supported on a protective hood of the degassing unit.

The protective hood is typically held on the base body. The protective hood is preferably made of a heat-resistant and pressure-resistant material, in particular metal. The protective hood is particularly preferably designed as a deep-drawn sheet metal part. The protective hood has at least one ventilation opening. The at least one ventilation opening is typically formed on the periphery of the protective hood. The protective hood preferably has a plurality of ventilation openings which are distributed uniformly over the circumference of the protective hood. Such a protective hood can also be provided if the degassing unit does not have a spring element. The protective hood can have fastening means, for example fastening straps that can be screwed on, for arrangement on the electronics housing. In this case, the base body can be attached to the electronics housing indirectly via the protective hood.

In the emergency closure state, the gas passage opening can preferably be completely closed by the closure body. In this case, the closure body is pressed in a sealing manner, in particular by an axial force, against a circumferential axial sealing surface that forms an edge of the gas passage opening of the base body. The axial force is preferably generated by the at least one spring element.

The gas passage opening can be completely closed by the closure body in the (closed) normal operating state. Here, the closure body can be sealed by an axial force to an edge of the gas passage Circumferential sealing surface forming the base body can be pressed on. The sealing surface can be formed on a seal, which is preferably held on the base body.

In a preferred embodiment of the degassing unit, in the (open) normal operating state, the closure body is spaced apart from the base body at least in regions by a spacer. The degassing unit can have the spacer, for example, between the closure body and the base body. As a result, a complete closing of the gas passage opening can be prevented, so that gas exchange is made possible in the normal operating state. The spacer is designed or arranged on the base body in such a way that it loses its effect during an emergency degassing process, so that the closure body can come into sealing contact with the base body in the emergency closure state.

The spacer is particularly preferably held on the closure body in the normal operating state and has a predetermined separation point which is designed to separate the closure body from the spacer in the emergency degassing state. The spacer is preferably arranged between the protective hood and the closure body, in particular coaxially to the spring element. More preferably, the spacer penetrates a through-hole in the protective hood. This enables the closure body to be guided by the spacer when the closure body is deflected. The spacer can particularly preferably have a stop on an outside of the protective hood, which limits the movement of the closure body in the direction of the base body. The spacer is preferably interlocked with the protective hood by a securing means, the securing means having the stop.

The intended separation point can be designed for separation as a result of mechanical and/or thermal stress.

The predetermined separation point can preferably be formed as a notch in the spacer, with the notch breaking under pressure from the escaping gas during the emergency degassing process.

The predetermined separation point is particularly preferably designed as a connecting means by which the closure body is held on the spacer, the connecting means losing its ability to connect at a temperature of no more than 250°C, preferably no more than 200°C, particularly preferably no more than 150°C. The spacer preferably consists of such a material. The aforementioned temperatures can in particular indicate a softening point or a melting point. This makes it easy to ensure that during an emergency degassing process in which hot gases flow out of the interior of the housing, the predetermined separation point loses its strength at least to the extent that the spacer is no longer able to hold the closure body.

In the emergency closure state, the closure body of the degassing unit according to the invention can be in continuous circumferential contact with the base body in order to seal it tightly. For this purpose, the base body can have at least one sealing element that can be held in a groove, for example. The base body can be sealed particularly reliably in the emergency closure state by the sealing element. The sealing element is preferably arranged in the flow shadow of a holding structure, for example a groove wall. Damage to the sealing element by hot gas, which flows through the pressure equalization device during an emergency degassing process, can thereby be limited to the extent necessary for the performance of the function or, in the most favorable case, be avoided completely. The sealing element is particularly preferably made from a heat-resistant material, in particular from a silicone or a fluorinated rubber. As a result, damage to the sealing element can be further avoided.

The degassing unit can have an emergency degassing mandrel. The emergency degassing mandrel can protrude from the closure body towards the membrane. During an emergency degassing process, the membrane is deflected towards the emergency degassing mandrel by the sharp and rapid pressure increase in the interior of the electronics housing, which destroys it. Destroying the membrane reduces the flow resistance of the degassing unit, so that the emergency degassing process can take place particularly quickly.

In a preferred embodiment of the degassing unit, the particle separation device has at least one further, preferably at least two further, separating elements. The separating elements are preferably connected in series in terms of flow. The mesh size of the separating elements preferably decreases along the flow path leading from the interior of the battery housing into the environment. As a result, the degree of separation of the particle separation device can be increased. In embodiments, the base body forms at least one of the separating elements. Alternatively or additionally, at at least one of the separating elements can be attached to the base body.

The particle separation device preferably has at least one separation element for depth filtration. The mesh width of the separating element for depth filtration is preferably at most 0.5 millimeters, preferably at most 0.3 millimeters. More preferably, the separating element for depth filtration is downstream of the other separating elements on the flow path leading from the interior of the battery housing into the environment. As a result, the degree of separation of the particle separation device can be further improved. The separating element for depth filtration can, for example, comprise a metal fiber fleece and/or a metal foam.

The degassing unit can be designed as a single structural unit. Typically, the structural unit has a fixed assembly of its components (for example base body, particle separation device, seals, protective hood, closure body, spring element and/or membrane) in a state of the degassing unit before it is arranged on the electronics housing. The components of the structural unit are at least held together in a captive manner, in particular connected to one another in a non-detachable manner. In other words, the individual components of the degassing unit are held together in such a way that the structural unit can be arranged as one piece on the electronics housing. This simplifies the assembly of the degassing unit on the electronics housing.

In a preferred embodiment, the degassing unit has several, particularly preferably two, structural units. When the degassing unit is arranged on the electronics housing, one of the structural units is preferably arranged as an outer part predominantly outside the electronics housing and one of the structural units as an inner part is arranged predominantly inside the electronics housing. As a result, the required space requirement of the degassing unit can be flexibly adapted to the existing space inside and outside the electronics housing.

The outer part is preferably designed to be arranged at the pressure equalization opening on an outside of the housing wall and the inner part is designed to be arranged at the same pressure equalization opening on an inside of the housing wall. The outer part and/or the inner part is typically arranged in a fluid-tight manner on the housing wall. The inner part preferably protrudes over the entire circumference in the radial direction over the pressure equalization opening of the electronics housing. As a result, the sealing effect of the degassing unit can be increased, since overpressure in the interior of the electronics housing leads to the inner part being pressed against the housing wall.

More preferably, the outer part and the inner part form the flow path through the degassing unit when the degassing unit is arranged on the electronics housing. In other words, the outer part is arranged fluidically downstream of the inner part on the flow path. This further improves the flexibility of the degassing unit in relation to the arrangement on the electronics housing.

When the degassing unit is in a state on the electronics housing, the outer part or the inner part preferably grips, in particular grips through, the pressure equalization opening of the electronics housing. Particularly preferably, both the outer part and the inner part engage in the pressure equalization opening of the electronics housing. In this way, an optimal use of the available installation space can be achieved.

More preferably, the outer part can be arranged on the inner part, in particular in a fluid-tight manner. Typically, the outer part and the inner part are held together. In this case, the degassing unit, after being arranged on the electronics housing, forms a multi-part base body which penetrates or protrudes through the pressure equalization opening. After the structural units have been arranged on the electronics housing, the parts of the base body are arranged directly next to one another. This is advantageous with regard to the sealing of the degassing unit to the housing wall. In addition, one of the structural units can be fastened to the electronics housing by means of the other structural unit, as a result of which the number of fastening means can be reduced.

Alternatively, the structural units can each be designed individually for attachment to the housing wall of the electronics housing. In this case, the base body of the degassing unit is designed in several parts. In a state of the degassing unit arranged on the electronics housing, the base body or parts of the base body are arranged both on the side of the housing wall of the electronics housing facing the interior space and on the side facing the environment. The parts of the base body can only be arranged indirectly next to one another.

The structural units preferably have the components of the degassing unit according to their functional relationship. For example, the structural units can each Have components in connection with sub-functions “separate particles” and “close the gas passage opening” of the degassing unit. The outer part typically has the gas passage opening and the contact surface with the closure body (subfunction “closing the gas passage opening”). Typically, the particle separation device is arranged and/or formed inside the inner part on the base body (partial function “separate particles”). A separating element of the particle separating device is preferably formed on the base body part of the inner part. In this way, the arrangement of the multiple structural units on the electronics housing can be simplified.

Electronics housing according to the invention

An electronics housing, in particular a battery housing, in particular for a traction battery of a motor vehicle, with a degassing unit according to the invention also falls within the scope of the present invention. The degassing unit is typically arranged on a housing wall of the electronics housing. The base body is typically held on the housing wall. The housing wall can have a through-hole into which the base body can be inserted. In particular, it can be provided that the base body protrudes through the housing wall. Electrochemical energy storage cells are preferably arranged in the battery housing. In this respect, the invention also relates to a battery. The energy storage cells can be lithium-ion cells.

The degassing unit can have several, in particular two, structural units. A first structural unit with the closure body is preferably arranged on the outside of the electronics housing. A second structural unit with the particle separation device is preferably arranged on the inside of the electronics housing. The two structural units can each be in fluid-tight contact with the electronics housing.

degassing process

For further explanation of the present invention, a method for degassing an electronics housing, in particular a battery housing, in particular for a traction battery of a motor vehicle, is described below. The electronics housing has a degassing unit according to the invention as described above. The electronics housing is therefore an electronics housing according to the invention as described above.

In a first step of the method, a gas exchange is carried out between the interior of the housing and the environment. The degassing unit according to the invention is in the open normal operating state. The gas exchange takes place through the particle separation device, the membrane and between the closure body and the base body. In other words, to equalize the pressure, the gas flows along the flow path that is open between the closure element and the base body in this normal operating state of the pressure equalization device. Alternatively it can be provided that the degassing unit is in the closed normal operating state and gas exchange is prevented. In addition, it is possible for the degassing unit to be basically closed in the normal operating state and to open in the event of pressure differences that typically occur in normal operation, in order to quickly reduce this pressure, but without going into an emergency opening state. This function can always come into play when the actually acting pressure difference remains below the "predetermined pressure difference" for the transition to the emergency degassing state.

In a second step, an emergency degassing process is carried out. During the emergency degassing process, in particular, hot gas under high pressure can escape from the interior of the electronics housing into the environment with a large volume flow. The gas can carry impurities, for example particles and/or very small fragments of the electronics arranged in the electronics housing. The particle separation device separates the entrained contaminants before they flow through the gas passage opening, so that the contaminants are prevented from being deposited at the contact point between the base body and the closure body. The membrane can be destroyed during the emergency degassing process. This can make it easier for the gas to escape from the interior.

In a third step, the gas passage opening is closed by the closure body. In other words, the degassing unit changes to the emergency closure state. By tightly closing the base body or the gas passage opening, it is possible to prevent gases and/or liquids, in particular gases or liquids containing oxygen, from flowing into the housing. If the emergency degassing process was triggered by a defect in the electrochemical energy storage cells arranged in the electronics housing, the occurrence of a fire can be counteracted by sealing the electronics housing or a fire that has already started can be extinguished.

If the closure body is prestressed against the base body, the closure body can be lifted off the base body during the emergency degassing process. This can be done against the action of a spring element that pretensions the closure body. By further raising the closure body from the base body, a particularly large cross-section through which a flow can flow can be released in order to facilitate the emergency degassing process.

If the closure body is spaced apart from the base body by a spacer in the open normal operating state, the spacer can be destroyed during the emergency degassing process. As a result, the spacer loses its effect, so that after the end of the emergency degassing process, the closure body can come into sealing contact with the base body in the emergency closure state. Destruction of the spacer means in particular that it loses its shape and/or strength at least to the extent that it is no longer able to keep the closure body at a distance from the base body. A predetermined separation point of the spacer is preferably broken and/or melted during the emergency venting process.

character list

• 1a eine erfindungsgmäße Entgasungseinheit als eine einzige bauliche Einheit mit einem Grundkörper und einer Partikelabscheidevorrichtung, in einer schematischen Perspektivansicht auf eine einem Elektronikgehäuse im Einbauzustand zugewandte Seite;
• 1b die Entgasungseinheit von 1a in einer schematischen Perspektivansicht auf eine dem Elektronikgehäuse im Einbauzustand abgewandten Seite;
• 1c ein Abscheideelement einer Partikelabscheidevorrichtung für eine erfindungsgemäße Entgasungseinheit, in einer ausschnittsweisen schematischen Draufsicht;
• 2a die Entgasungseinheit von 1a und 1b in einem Normalbetriebszustand, bei dem die Entgasungseinheit einen Strömungsweg zum Druckausgleich eröffnet, in einer schematischen Schnittansicht;
• 2b die Entgasungseinheit von 2a in einer vergrößerten, ausschnittsweisen Schnittansicht;
• 3a die Entgasungseinheit von 1a und 1b während eines Notentlüftungsvorgangs, bei dem ausströmendes Gas das Verschlusselement gegen die Wirkung eines Federelements weiter von dem Grundkörper abhebt, in einer schematischen Schnittansicht;
• 3b die Entgasungseinheit von 3a in einer vergrößerten, ausschnittsweisen Schnittansicht;
• 4a die Entgasungseinheit von 1a und 1b in einem Notverschlusszustand, bei dem der Gasaustausch durch die Entgasungeinheit unterbunden ist, in einer schematischen Schnittansicht;
• 4b die Entgasungseinheit von 4a in einer vergrößerten, ausschnittsweisen Schnittansicht;
• 5 eine weitere erfindungsgemäße Entgasungseinheit mit zwei baulichen Einheiten vor Anordnung an einem Elektronikgehäuse in einer schematischen, perspektivischen Schnittansicht;
• 6 ein erfindungsgemäßes Elektronikgehäuse, an welchem die weitere erfindungsgemäße Entgasungseinheit von 5 angeordnet ist in einer schematischen, perspektivischen Schnittansicht.
• 7 ein weiteres erfindungsgemäßes Elektronikgehäuse, an welchem eine weitere erfindungsgemäße Entgasungseinheit als eine einzige bauliche Einheit angeordnet ist, in einer schematischen Schnittansicht.

Further features and advantages of the invention result from the following detailed description of exemplary embodiments of the invention, the patent claims and the figures of the drawing, which show details according to the invention. The features mentioned above and those detailed below can each be implemented individually or collectively in any desired, expedient combinations in variants of the invention. The features shown in the drawing are presented in such a way that the special features according to the invention can be made clearly visible. Show in the drawing:

• 1a a degassing unit according to the invention as a single structural unit with a base body and a particle separating device, in a schematic perspective view of a side facing an electronics housing in the installed state;
• 1b the degassing unit of 1a in a schematic perspective view of a side facing away from the electronics housing in the installed state;
• 1c a separating element of a particle separating device for a degassing unit according to the invention, in a partial schematic top view;
• 2a the degassing unit of 1a and 1b in a normal operating state, in which the degassing unit opens a flow path for pressure compensation, in a schematic sectional view;
• 2 B the degassing unit of 2a in an enlarged, fragmentary sectional view;
• 3a the degassing unit of 1a and 1b during an emergency ventilation process, in which escaping gas lifts the closure element further from the base body against the action of a spring element, in a schematic sectional view;
• 3b the degassing unit of 3a in an enlarged, fragmentary sectional view;
• 4a the degassing unit of 1a and 1b in an emergency closure state, in which the gas exchange is prevented by the degassing unit, in a schematic sectional view;
• 4b the degassing unit of 4a in an enlarged, fragmentary sectional view;
• 5 another degassing unit according to the invention with two structural units before arrangement on an electronics housing in a schematic, perspective sectional view;
• 6 an electronic housing according to the invention, to which the further degassing unit according to the invention 5 is arranged in a schematic, perspective sectional view.
• 7 a further electronics housing according to the invention, on which a further degassing unit according to the invention is arranged as a single structural unit, in a schematic sectional view.

Embodiments of the invention

1a and 1b show a first embodiment of a degassing unit 10. The degassing unit 10 is designed as a single structural unit and has a base body 12. FIG. The base body 12 is designed in one piece here.

The degassing unit 10 is used for gas exchange between an interior 14 and an environment 16 of an electronics housing 18, see 5 . For this purpose, the base body 10 is in a housing wall 20 ( 5 ) of the housing 18 can be used. A seal 22 ensures that the gas exchange during degassing is through the degassing means 10 and does not bypass it. In other words, the space between the housing wall 20 ( 5 ) and the degassing unit 10 sealed fluid-tight by the seal 22.

The base body 12 has a cylindrical hollow body section 24 and a rim section 26 . In the present embodiment, the hollow body section 24 of the base body 12 forms a separating element 28a of a particle separating device 30 of the degassing unit 10 .

In the present embodiment, the degassing unit 10 has a protective hood 32 . The protective hood 32 serves to protect the degassing unit 10. In other words, the protective hood 32 prevents unintentional or unintentional access to the interior of the degassing unit 10. In addition, the interior of the degassing unit 10, in particular the base body 12, is protected from macroscopic contaminants from the environment 16 ( 5 ) protected. The protective hood 32 has at least one, here several, ventilation openings 34 . The ventilation openings 34 can be distributed over a circumference of the protective hood 32 .

The protective hood 32 is held on the base body 12 or the rim section 26 . The protective hood 32 encompasses the rim section 26 of the base body 12 by means of several hooks 36 (only one hook 36 being provided with a reference number for reasons of clarity). The hooks 36 of the protective cap 32 are preferably formed by plastic forming during the manufacture of the degassing unit 10 when the protective cap 32 is arranged on the base body 12 . This achieves a particularly favorable and secure connection of the protective hood 32 to the base body 12 .

The degassing unit 10 has fastening tabs 38 which are formed on the protective hood 32 in the present embodiment. The fastening tabs 38 are used to fasten the degassing unit 10 to the electronics housing 18 ( 5 ) using conventional fasteners, especially screws (not shown). In other words, the base body 12 is attached indirectly via the protective hood 32 to the electronics housing 18 ( 5 ) attached.

The separating element 28a has a multiplicity of meshes 40 which are structured in the separating element 28a and distributed uniformly over the surface of the separating element 28a.

1c shows an enlarged partial detail of an exemplary embodiment of a separating element 28a, as is also the case in the degassing unit 10 according to FIGS 1 a and 1 b can be used. The separating element 28a has the meshes 40 with a mesh size 42 (only three meshes 40 and three mesh sizes 42 being provided with a reference number for reasons of clarity). The mesh size 42 can be 0.8 mm. In the present case, the meshes 40 have a predominantly rectangular cross section. The meshes 40 therefore each release a predominantly rectangular flow cross section, the mesh width 42 for each mesh 40 relating to the smallest flow diameter in the flow cross section. In the present embodiment, all meshes 40 have the same mesh size 42 .

2a shows the degassing unit from the 1a and 1b in a cut side view. 2 B shows enlarged section X of the degassing unit 2a .

A closure body 44 is arranged between the base body 12 and the protective hood 32 . The closure body 44 is designed to completely close a gas passage opening 46 . The closure body 44 is prestressed by means of a spring element 48 , here a cylindrical spiral spring, which is supported against the protective hood 32 .

In 2a and 2 B the degassing unit 10 is in an open normal operating state, which equalizes the pressure between the interior 14 ( 5 ) and environment 16 ( 5 ) enabled. A spacer 50, here a hollow cylinder sleeve, is held on the closure body 44 at one end. At the other end, the spacer 50 reaches through the protective hood 32 and is interlocked by a locking pin 52 on a side of the protective hood 32 facing away from the closure body 44 . In the normal operating state, the safety pin 52 rests as a stop on the side of the protective hood 32 facing away from the closure body 44 . As a result, the closure body 44 is prevented from deflecting in the direction of the base body 12 as a result of the spring force of the spring element 48 . The spacer 50 is designed here coaxially with the spring element 48 .

The gas passage opening 46 of the base body 12 is not closed due to the spacer 50 , as a result of which a flow path 54 is opened between the closure body 44 and the base body 12 . The gas passage opening 46 is covered by a selectively permeable membrane 56 . The membrane 56 is permeable to gases. Liquids and solids are retained by the membrane 56. In the present case, the gas passage opening 46 is designed as a continuous opening. The gas passage opening 46 can also be in several partial openings, in particular in the form of a grid, be subdivided. The membrane 56 can then lie against webs between the partial openings.

For pressure equalization, gas can flow along the flow path 54 through the particle separation device 30, the membrane 56, the gas passage opening 46, between the closure body 44 and the base body 12 and through the ventilation openings 34 in the protective hood 32. In this way, gas exchange is possible both from the electronics housing 18 and from the environment 16 into the electronics housing 18 .

In addition to the separating element 28a formed in the cylindrical hollow body section 24 , the particle separating device 30 has a further separating element 28b which is arranged below the gas passage opening 46 on the rim section 26 of the base body 12 . The separating element 28b can be identical to the separating element 28a with regard to the formation of the meshes 40 . It is preferably provided that the separating element 28b has a smaller mesh width 42 than the separating element 28a, for example 0.5 mm.

The base body 12 has a heat-resistant seal 58 . The heat-resistant seal 58 is designed in the form of a ring and is closed around the circumference. The heat-resistant seal 58 and the base body 12 are permanently connected to one another here.

The base body 12 has a continuous, closed flanged edge 60 on the circumference, which protrudes from the crown section 26 and engages behind the heat-resistant seal 58 pointing radially inwards. In other words, the heat-resistant seal 58 is gripped by the beaded edge 60 on the radially outer edge. According to the present embodiment, the separating element 28b and the selectively permeable membrane 56 are also held by the flanged edge 60 . As a result, a clamping connection can be established between the aforementioned components in a particularly favorable manner with just one flanging operation.

The degassing unit 10 is designed as a single structural unit, with all the components of the degassing unit (base body 12, particle separation device 30, protective hood 32, closure body 44, spring element 48, spacer 50, locking pin 52, membrane 56 and heat-resistant seal 58) being one in the embodiment shown form a solid bond, i.e. are at least held together so that they cannot be lost. The components are also inseparable, i.e. they cannot be detached from one another without being destroyed.

3a and 3b show the degassing unit 10 in an emergency degassing state during an emergency degassing process, wherein FIG 3b the enlarged section X of the degassing unit 3a shows. During the emergency degassing process, hot gas flows out of the electronics housing 18 under high pressure and with a large volume flow (see 5 ). The closure body 44 is thus further spaced from the base body 12 counter to the spring force of the spring element 48 . As a result, a large flow cross-section is released. This reduces the flow resistance of the degassing unit 10. The emergency degassing process can take place quickly. The deflection of the closure body 44 can be guided by the spacer 50 .

The outflowing gas can contain impurities (not shown), for example fragments, splinters and/or particles, which are retained by means of the separating elements 28a, 28b of the particle separating device 30. In other words, the contaminants are prevented from getting into the environment 16 or being deposited on the contact surfaces between the closure body 44 and the base body 12 or the heat-resistant seal 58 . This ensures that a proper fluid-tight closure of the degassing unit 10 can take place in a downstream emergency closure state of the degassing unit 10 .

At the beginning of the emergency degassing process, the membrane 56 is compressed by the increasing pressure in the interior 14 ( 5 ) of the electronics housing 18 ( 5 ) deflected and pressed against an emergency degassing mandrel 62. This destroys the membrane 56 (in the 3a and 3b now shown as an opening). This further reduces the flow resistance of the degassing unit 10 . The emergency degassing mandrel 62 protrudes here from the closure body 44 to the membrane 56 .

During the emergency degassing process, a predetermined separation point 64 of the spacer 50 is destroyed, as a result of which the closure body 44 is separated from the spacer 50 having the securing pin 52 . Here, the intended separation point 64 of the spacer 50 consists of a connecting agent on the contact surface between the spacer 50 and the closure body 44, which has a melting point of less than 200° C., for example an adhesive. Due to the hot gas flowing out of the housing 18, the connecting means of the predetermined separation point 64 is heated during the emergency degassing process and loses its ability to connect. The closure body 44 is supported by the spacer 50 separately. Alternatively, it can be provided that the predetermined separation point 64 is formed, for example, as a notch (not shown) in the spacer 50 and separation occurs as a result of the pressurization of the outflowing gas. In addition, it can be provided that parts of the spacer 50 remain on the closure body 44 after the separation.

4a and 4b show the degassing unit 10 after completion of the emergency degassing process, wherein 4b the enlarged section X of the degassing unit 4a shows. The degassing unit 10 is now in an emergency closure state. After the excess pressure in the interior 14 ( 5 ) of the electronics housing 18 ( 5 ) the spring element 48 presses the closure body 44 against the base body 12 or the heat-resistant seal 58. The closure body 44 closes the gas passage opening 46 of the base body 12 in a fluid-tight manner. For this purpose, the closure body 44 can bear continuously circumferentially on the heat-resistant seal 58 of the base body 12 . An inflow of substances, especially liquids or gases, from the environment 16 ( 5 ) into the interior 14 ( 5 ) of the electronics housing 18 ( 5 ) through the degassing unit 10 is now no longer possible. A leakage of gas from the interior 14 ( 5 ) to the area 16 ( 5 ) is not possible as long as the pressure in the interior 14 ( 5 ) is not sufficient to lift the closure body 44 against the action of the spring element 48 from the base body 12 or the heat-resistant seal 58. When the pressure in the interior 14 ( 5 ) becomes large enough, pressure equalization to the outside is also possible in the emergency closure state, in that the closure body 44 is temporarily lifted off the heat-resistant seal 58 .

The spacer 50 can be in its initial position in the emergency closure state (see 2a and 2 B) are located, but is now separated from the closure body 44 and spaced from this.

5 shows a second embodiment of a degassing unit 10 prior to being arranged on an electronics housing 18. The electronics housing 18 has a pressure equalization opening 68 in the housing wall 20. FIG.

The degassing unit 10 here has several, specifically exactly two, structural units and a multi-part base body 12 . In the present case, the structural units are designed as an inner part 70 and an outer part 72 . The inner part 70 and the outer part 72 can each be connected to the edge of the pressure equalization opening 68 of the electronics housing 18 via the base body 12 . For this purpose, the inner part 70 and the outer part 72 each have at least one part of the multi-part base body 12 . For the fluid-tight arrangement between the housing wall 20 and the base body 12, both the inner part 70 and the outer part 72 each have a seal 22 in the embodiment shown. It can also be provided that only the inner part 70 or the outer part 72 has the seal 22 .

The separating element 28a is formed in the hollow body section 24 of the base body 12 . In the embodiment shown, the hollow body section 24 at its end facing the housing wall 20 holds a socket section 74 of the base body 12 via a flange, which is designed to penetrate into the pressure equalization opening 68 . The seal 22 is arranged on the circumference of the socket section 74 .

The part of the base body 12 on the outer part 72 is ring-shaped. The seal 22 is arranged within a circumferential groove of the base body 12 on a side of the outer part 72 facing the housing wall 20 . On a side of the base body 12 facing away from the housing wall 20 , the outer part 72 has the heat-resistant seal 58 which is arranged in a further circumferential groove of the base body 12 . The heat-resistant seal 58 protrudes from the base body 12 and towards the closure body 44 . This ensures that the closure body 44 rests circumferentially on the heat-resistant seal 58 in the closed state. In the present embodiment, in addition to the heat-resistant gasket 58, an additional auxiliary heat-resistant gasket 76 is provided. The heat-resistant auxiliary seal 76 is designed here with smaller cross-sectional dimensions and is arranged radially further inwards on the base body 12 than the heat-resistant seal 58. The sealing effect can be increased as a result.

The degassing unit 10 also has a protective hood 32 with ventilation openings 34 . The protective hood 32 surrounds the base body part of the outer part 72 on its circumference. The protective hood 32 has fastening straps 38 which are designed for the direct fastening of the protective hood 32 to the housing wall 20 . The outer part 72 is attached to the housing wall 20 via the protective hood 32 . The base body part of the outer part 72 is attached directly to the housing wall 20 via the protective hood 32 .

The base body part of the inner part 70 has a fastening eyelet 78 for direct fastening to the housing wall 20 of the electronics housing 18 . The fastening eyelet 78 is here on the hollow body section 24 of the base body 12 is formed.

The particle separation device 30 and the main body part of the inner part 70 are held together at least in a captive manner. The base body 12 or the base body part of the inner part 70 and the particle separation device 30 are also inseparable, i.e. they are not held together in a detachable manner. The inner part 70 is designed to be arranged on an inside of the electronics housing 18 with respect to a degassing direction from the interior 14 into the surroundings 16 of the electronics housing 18 .

The protective hood 32, the closure body 44, the spring element 48, the heat-resistant seal 58, the heat-resistant auxiliary seal 72 and the main body part of the outer part 72 are held together at least captively. The base body 12 or the base body part of the outer part 72 and the protective hood 32 are also inseparable, i.e. not detachably attached to one another without being destroyed. The closure body 44, the spring member 48, the refractory seal 58 and the auxiliary refractory seal 72 components are sandwiched between the body portion of the outer portion 72 and the protective hood 32. As shown in FIG. The outer part 72 is designed to be arranged on an outside of the electronics housing 18 with respect to a degassing direction from the interior 14 into the surroundings 16 of the electronics housing 18 .

6 shows the electronics housing 18 with the degassing unit 10 5 in an assembled condition (fasteners not shown). The degassing unit 10 is in a closed normal operating state, which does not allow any gas exchange between the interior 14 and the environment 16 . The closure body 44 is pressed against the heat-resistant seal 58 and the heat-resistant auxiliary seal 76 of the base body 12 on the outer part 72 by means of the spring element 48 . As a result, the gas passage opening 46 of the base body 12 and thus a possible flow path 54 (see 2a and 2 B) locked.

An increase in pressure in the interior 14 of the electronics housing 18 causes the closure body 44 to be lifted off the base body 12 or from the heat-resistant seal 58. The closure body 44 is deflected away from the base body 12 against the spring force of the spring element 48. As a result of the deflection of the closure body 44, a flow path 54 is created (see 2a and 2 B) between the base body 12 and the closure body 44, through which the hot gas can escape from the electronics housing 18. Impurities that are carried along in the escaping gas are effectively retained on the inner part 72 via the particle separation device 30 or via the separation element 28a. It is thus possible to effectively prevent the contaminants from escaping into the environment 16 or from being deposited on the heat-resistant seal 58, the heat-resistant auxiliary seal 76 and/or the contact surface of the closure body 44. In this way it can be ensured that the degassing unit 10 can change to an emergency closure state that is closed in a fluid-tight manner after the emergency degassing process.

Since gas exchange is not provided here in the normal operating state of the degassing unit 10, a selectively permeable membrane 56 (see 2a and 2 B) and an emergency degassing mandrel 62 (see 3a) be waived. Furthermore, a spacer 50 can be dispensed with, since the embodiment shown changes from the closed normal operating state to a closed emergency closure state during an emergency degassing process.

7 12 shows a further embodiment of an electronics housing 18 with a further embodiment of a degassing unit 10 in an assembled state (fastening means not shown). The degassing unit 10 is designed as a single structural unit. The degassing unit 10 is in an emergency degassing state during an emergency degassing process. Gas exchange between the interior 14 and the environment 16 is permitted during the emergency degassing process. The closure body 44 is lifted by the pressure in the interior 14 against the spring force of the spring element 48 from the heat-resistant seal 58 of the base body 12 and pressed against the protective hood. As a result, the gas passage opening 46 of the base body 12 and consequently the flow path 54 is opened.

The base body 12 is arranged on the edge of the pressure equalization opening 68 of the electronics housing 18 . The edge of the pressure equalization opening 68 has a chamfer on which the seal 22 of the degassing unit 18 is positioned. The base body 12 is formed in one piece in the embodiment shown.

In the embodiment shown, the particle separating device 30 has a separating element 28c for depth filtration in addition to the separating element 28a and 28b. In the embodiment shown, the separating element 28c for deep-bed filtration is arranged between the separating elements 28a and 28b, which fix the separating element 28c in its position within the degassing unit 10 for deep-bed filtration. This can a degassing unit can be equipped particularly easily with a separating element 28c for depth filtration without having to make any design changes. It could also be provided that the separating element 28c for depth filtration is downstream of the separating elements 28a and 28b on the flow path 54 from the interior 14 to the environment 16 (not shown in detail).

Reference List

10

degassing unit

12

body

14

inner space

16

Vicinity

18

electronics housing

20

housing wall

22

poetry

24

Hollow body section of the base body 12

26

Crown section of the body 12

28a, 28b, 28c

separation elements

30

particle separator

32

protective hood

34

vents

36

Guard hook 32

38

mounting tabs

40

meshes

42

mesh size

44

closure body

46

gas passage opening

48

spring element

50

spacers

52

locking pin

54

flow path

56

membrane

58

Heat resistant seal

60

beaded edge

62

emergency degassing mandrel

64

predetermined separation point

68

pressure equalization opening

70

Inner part of the body 12

72

Outer part of the body 12

74

nozzle section

76

Heat resistant auxiliary seal

78

attachment eyelet

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• WO 2011/161512 A1 [0004]
• DE 102019100094 A1 [0005]

Claims (19)

Degassing unit (10) for an electronics housing (18), in particular for a battery, in particular for a traction battery of a motor vehicle, which has a base body (12) which can be connected in a fluid-tight manner to an edge of a pressure equalization opening (68) of the electronics housing (18) and which has at least one gas passage opening (46) has, - wherein the degassing unit (10) has a closure body (44) which, when a predetermined pressure difference between an interior (14) of the electronics housing (18) and an environment (16) of the electronics housing (18) is exceeded, moves from an initial position to a normal operating state of the degassing unit (10) can be deflected in order to convert the degassing unit (18) into an emergency degassing state in which the gas passage opening (46) is at least partially open, - When the pressure difference between an interior (14) of the electronics housing (18) and an area (16) of the electronics housing (18) falls below a predetermined level, the closure body (44) can be displaced back in such a way that the closure body (44) opens the gas passage opening (46) closes and the degassing unit (18) changes from the emergency degassing state to an emergency closing state, - A particle separation device (30), which has at least one separation element (28a-c) with a mesh size (42 ) of at most 1.0 mm. degassing unit claim 1 , characterized in that the closure body (44) is prestressed relative to the base body (12), in particular counter to the direction of the flow path (54) leading from the interior (14) of the battery housing into the environment in the assembled state. degassing unit claim 2 , characterized in that a spring element (48) is provided which prestresses the closure body (44) and is supported in particular on a protective hood (32) of the degassing unit (10). Degassing unit according to one of the preceding claims, characterized in that the gas passage opening (46) is completely closed by the closure body (44) in the emergency closure state, the closure body (44) being sealed by an axial force against an edge of the gas passage opening (46) of the base body (12) forming circumferential axial sealing surface is pressed. Degassing unit according to one of Claims 1 until 4 , characterized in that the gas passage opening (46) is completely closed by the closure body (44) in the normal operating state, the closure body (44) in its initial position being sealed by an axial force to one edge of the gas passage opening (46) of the base body (12) forming circumferential axial sealing surface is pressed. Degassing unit according to one of Claims 1 until 4 , characterized in that in the normal operating state the closure body (44) in its initial position is at least partially spaced from the base body (12) by a spacer (50) in order to prevent the gas passage opening (46) from closing completely. degassing unit claim 6 , characterized in that the spacer (50) is held on the closure body (44) in the normal operating state and has a predetermined separation point (64) which is designed to separate the closure body (44) from the spacer (50) during an emergency degassing process. degassing unit claim 7 , characterized in that the predetermined separation point (64) is designed as a connecting means by which the closure body (44) is arranged on the spacer (50), the connecting means being at a temperature of at most 250°C, preferably at most 200°C, particularly preferably at most 150°C, loses its connectivity. Degassing unit according to one of the preceding claims, characterized in that an emergency degassing mandrel (62) protrudes from the closure body (44) and the base body (12) has a gas-permeable membrane (56) for gas pressure equalization in the normal operating state, which is along the flow path (54) to the emergency degassing mandrel (62) is immediately upstream. Degassing unit according to one of the preceding claims, characterized in that the particle separating device (30) has at least one further, preferably at least two further, separating elements (28a-c), the mesh width (42) of the separating elements (28a-c) preferably being along the out the interior (14) of the electronics housing (18) leading to the environment (16) flow path (54) decreases. degassing unit claim 10 , characterized in that the particles from separating device (30) has at least one separating element (28c) for depth filtration, preferably with a mesh size (42) of at most 0.5 millimeters. Degassing unit according to one of the preceding claims, characterized in that the base body (12) forms one of the separating elements (28a) and/or at least one of the separating elements (28a) is attached to the base body (12). Degassing unit according to one of the preceding claims, characterized in that in the emergency closure state the closure body (44) continuously encircles the base body (12), preferably a sealing element, in particular a heat-resistant seal (58) and/or a heat-resistant auxiliary seal (76), of the Body, is present. Degassing unit according to one of Claims 1 until 13 , characterized in that the degassing unit (10) is designed as a structural unit. Degassing unit according to one of Claims 1 until 13 , characterized in that the degassing unit (10) forms several, in particular two, structural units, with a first structural unit as an outer part (72) for arrangement outside the electronics housing (18) and a second structural unit as an inner part (70) for Arrangement within the electronics housing (18) is formed. degassing unit claim 15 , characterized in that the inner part (70) of the degassing unit (18) has the particle separator (30). degassing unit claim 15 or 16 , characterized in that the outer part (72) of the degassing unit (18) has the closure body (44). Electronics housing (18), in particular battery housing, in particular for a traction battery of a motor vehicle, with a degassing unit (10) according to one of the preceding claims. electronics housing Claim 18 , characterized in that the degassing unit (10) according to one of Claims 15 until 17 is formed, and that the outer part (72) of the degassing unit (10) on the outside and the inner part (70) on the inside of the electronics housing (18) are arranged.

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