Battery housing, traction battery, motor vehicle and method of manufacturing battery housing

Abstract

The invention relates to a battery housing, in particular for a traction battery of a motor vehicle, the battery housing having a semipermeable membrane which is connected to the battery housing in a material-bonded or force-fitted manner.

Description

[0001] This patent application claims the priority of German patent application 10 2020 108 442.0, the disclosure of which is expressly incorporated herein by reference.

[0002] The invention relates to a battery housing, a traction battery, a motor vehicle and a method for producing a battery housing.

[0003] Batteries, in particular traction batteries for storing energy in motor vehicles, consist of several components. The main task of the battery housing is to fix and protect the battery modules and other required components.

[0004] Battery usage and / or environmental conditions and / or failure of a battery cell and / or extreme operating conditions and / or volume changes of components mounted in the battery housing may lead to pressure changes, resulting in a pressure difference between the volume enclosed by the battery housing and the environment of the battery housing.

[0005] Pressure changes can be caused in particular by temperature fluctuations, in particular by changes in the ambient temperature and / or the internal temperature of the battery housing. Pressure changes can also be caused by weather changes and / or changes in the battery's altitude. Outgassing of battery cells, in particular as a reaction to thermal overloading of the battery, can also lead to pressure changes.

[0006] In order to prevent the pressure changes from causing danger to the structure of the battery housing, the battery housing needs to be ventilated and exhausted to reduce the pressure difference caused by the pressure changes.

[0007] The object of the present invention is to propose an improvement or alternative to the prior art. In particular, the present invention describes a technical solution for integrating one or more venting elements in a battery housing in a safe, permanent, sealed and cost-effective manner.

[0008] According to a first aspect of the invention, a solution for achieving the above-mentioned object is a battery housing, in particular a battery housing for a traction battery, wherein the battery housing is formed from plastic, wherein the battery housing has a semipermeable membrane, wherein the semipermeable membrane is configured to be permeable to a certain gaseous substance and impermeable to a certain liquid substance, wherein the battery housing has a receiving geometry for the semipermeable membrane, wherein the receiving geometry has a ventilation opening, wherein the receiving geometry is configured to be connected to the semipermeable membrane, wherein the semipermeable membrane is connected to the battery housing by material engagement or press-fit.

[0009] The following are the explanations of the relevant terms:

[0010] First of all, it should be pointed out that within the scope of this patent application, if the corresponding context does not clearly state, or it is obvious to a person skilled in the art, or it is technically mandatory to use the phrase "just one...", "just two...", etc., then indefinite articles such as "one", "two", etc. and numerical data should generally be understood as "at least" data, that is, "at least one...", "at least two...", etc.

[0011] In the context of this patent application, the expression “particularly” always means that optional, preferred features are introduced by this expression. The expression should not be understood as “exactly” or “namely”.

[0012] A “battery housing” is understood to be a housing component of a battery, in particular a traction battery. The battery housing is particularly suitable for accommodating components of the battery so that these components are protected from external influences and / or are at least indirectly fixed by the battery housing.

[0013] Preferably, the battery housing refers to a battery lower housing or a battery upper housing, wherein the battery lower housing differs from the battery upper housing in that it includes components for fixing components of the traction battery.

[0014] A "traction battery" refers to a certain energy storage device, in particular an electric current storage device. Preferably, the traction battery is suitable for installation in an electric vehicle and for driving the electric vehicle. Preferably, the traction battery is suitable for a battery electric vehicle and / or a motor vehicle having a battery electric drive and an internal combustion engine.

[0015] "Plastic" refers to materials that are mainly composed of large molecules.

[0016] The plastic is preferably a thermoplastic, wherein the thermoplastic can be deformed within the material-relevant temperature range, wherein this process is reversible and can be repeated any number of times by cooling and reheating to the molten state.

[0017] The plastic is preferably polyamide 6. Polyamide 6 particularly preferably has glass fiber reinforcement.

[0018] "Semipermeable membrane" refers to a partially permeable wall that allows particles with a size below a defined size associated with the membrane to pass through the membrane, while particles with a size above a defined size associated with the membrane are prevented from passing through the membrane.

[0019] A semipermeable membrane preferably refers to a membrane which allows gas exchange, in particular air exchange, but which is impermeable to liquids, in particular water, at least until a membrane-related pressure difference between the two surfaces of the membrane is reached, in particular before a pressure difference of 1.5 bar, preferably before a pressure difference of 2.0 bar, particularly preferably before a pressure difference of 3.0 bar is reached.

[0020] The semipermeable membrane is preferably designed in such a way that, at an overpressure of 5 mbar prevailing inside the battery housing, a gas volume flow of greater than or equal to 1 l / min is achieved, in particular at an overpressure of 20 mbar prevailing inside the battery housing.

[0021] The semipermeable membrane is preferably designed in such a way that it prevents liquid substances from flowing into the battery housing when an excess pressure of 300 mbar is present on the outer side of the battery housing.

[0022] A "gaseous substance" or a gas is a substance in a gaseous aggregate state. A gaseous substance is preferably a gas mixture, which corresponds to the composition of air or is similar to the composition of air.

[0023] "Liquid substance" or liquid refers to a substance in a liquid aggregate state. Liquid substance preferably refers to water or a substance composition similar to water.

[0024] The "accommodation geometry" refers to the area of ​​the battery housing geometry for accommodating one or more semipermeable membranes. The accommodation geometry has in particular an area for connecting to the semipermeable membrane by material bonding or press fit. In addition, the accommodation geometry has in particular one or more ventilation openings.

[0025] Preferably, the receiving geometry is integrally formed with the battery housing.

[0026] Preferably, the receiving geometry is configured to be connected to the semipermeable membrane indirectly or directly.

[0027] Preferably, the receiving geometry is directly connected to the semipermeable membrane by material engagement or by force fit.

[0028] Preferably, the receiving geometry is configured to receive an umbrella-shaped mushroom valve and / or a semipermeable membrane.

[0029] An "umbrella mushroom valve" refers to a valve that is shaped like an umbrella mushroom. The umbrella mushroom valve is configured to close and prevent flow at a relatively low pressure difference. The umbrella mushroom valve is also configured to open when a defined opening pressure difference is exceeded, thereby enabling a throughflow through the valve, and to close again when a defined closing pressure difference is below, thereby preventing a throughflow through the umbrella mushroom valve. Preferably, the umbrella mushroom valve is configured to allow flow only in one flow direction when an opening pressure difference is exceeded, so that the opening pressure difference causes opening only when a relatively low pressure acts on a preset side of the umbrella mushroom valve. Preferably, when the mushroom umbrella valve is open, the mushroom umbrella valve prevents a backflow in the direction opposite to the throughflow. The umbrella mushroom valve is advantageously a purely passive component.

[0030] The umbrella-shaped mushroom valve is preferably connected in a form-fitting manner to the receiving geometry and / or the diaphragm carrier.

[0031] Preferably, the umbrella-shaped mushroom valve is designed so that it opens when there is an overpressure of 100 mbar inside the battery housing. Preferably, the umbrella-shaped mushroom valve is designed so that it achieves a maximum volume flow of 150 l / s in a pressure range of 100 mbar to 100,000 mbar.

[0032] The umbrella-shaped mushroom valve is preferably designed in such a way that it blocks the flow into the battery housing when an overpressure of 300 mbar is present on the outer side of the battery housing.

[0033] Preferably, the umbrella-shaped mushroom valve is formed of an elastomer.

[0034] Advantageously, the battery housing can be vented by means of the umbrella-shaped mushroom valve when the internal pressure of the battery is high, thereby ensuring the structural integrity of the battery housing, especially in the case of thermal upgrading of the battery module.

[0035] Preferably, the housing geometry is configured to be covered by a protective cover. The protective cover is preferably electrically conductive. Preferably, the protective cover is configured to improve the electromagnetic compatibility of the battery housing, in particular by shielding a flow-through area of ​​the battery housing from electromagnetic radiation with the protective cover.

[0036] Preferably, the protective cover is connected to the receiving geometry, in particular to the snap-on element, in a press-fit and / or form-fitting manner. The protective cover is preferably crimped onto the receiving geometry.

[0037] Preferably, the protective cap has a contact element, wherein the contact element is configured to bring the protective cap into contact with a further region for improving the electromagnetic compatibility of the battery housing.

[0038] The protective cover preferably has a burst member.

[0039] Preferably, the housing geometry has a protection region which is configured to protect the semipermeable membrane and / or the umbrella mushroom valve from damage caused by any load acting on the semipermeable membrane and / or the umbrella mushroom valve, in particular any load acting on the battery housing from the outside and / or the inside. Such loads may in particular be caused by foreign bodies or liquids coming into contact with the battery housing. Foreign bodies are in particular stones or caked dirt. Liquids are in particular water or operating fluids of a motor vehicle.

[0040] Preferably, the receiving geometry is indirectly connected to the semipermeable membrane by material joining or press fit, in particular by means of a membrane carrier, wherein this means that the receiving geometry is directly connected to the membrane carrier, in particular by press fit and / or shape fit, and the membrane carrier is in turn directly connected to the semipermeable membrane by material joining or press fit.

[0041] "Membrane carrier" refers to a component used to be directly connected to a semipermeable membrane by material bonding or press-fitting. Preferably, the membrane carrier can be connected to a plurality of semipermeable membranes by material bonding or press-fitting. Preferably, the membrane carrier has an umbrella-shaped mushroom valve.

[0042] Preferably, the membrane carrier is connected to the receiving geometry in a press-fit and / or form-fitting manner.

[0043] Preferably, the membrane carrier is formed from polyethylene (PE) or polyoxymethylene (POM) or polyamide (PA).

[0044] The membrane carrier is preferably sealed off from the receiving geometry of the battery housing by means of a sealing component.

[0045] A "vent" refers to an opening in a housing geometry that is configured to ventilate and / or exhaust at least one side of a semipermeable membrane so that the semipermeable membrane allows the gas volume inside a battery housing having a battery casing to communicate with the gas volume surrounding the battery housing, thereby allowing gas exchange to occur between the gas volume inside the battery housing and the gas volume surrounding the battery housing through the semipermeable membrane.

[0046] "Materially bonded connection" refers to a connection of two bonded partners in which the two bonded partners are held together by atomic or molecular forces.

[0047] Preferably, the connection produced by welding or gluing or vulcanizing or soldering is a material-joined connection.

[0048] A "press-fit connection" refers to a connection of two connecting partners in which the action of normal forces between the connecting partners and the relative movement of the connecting partners are prevented by static friction.

[0049] A “positive connection” refers to a connection of two connecting partners in which the connecting partners snap into one another or snap into one another indirectly via at least one other connecting partner.

[0050] Various embodiments of battery housings are known in the prior art which have a venting element, in particular a semipermeable membrane.

[0051] The prior art includes, in particular, battery housings made of plastic or battery housings which are embodied as metal, wherein venting elements for flange mounting and venting elements for plug-in mounting are known.

[0052] Apart from the semipermeable membrane, previously known venting elements generally have 4 to 10 components and are usually sealed from the battery housing as a common assembly by means of a separate seal, in particular in the form of an O-ring or a rope seal.

[0053] In many cases, the prior art exhaust element has a separate exhaust element housing that accommodates the exhaust element and is formed of copper, metal or plastic.

[0054] Therefore, battery housings, in particular battery housings for traction batteries, are known in the prior art which are designed to be ventilated and / or vented by means of a venting element which is connected to the battery housing in a form-fitting manner.

[0055] In contrast to the prior art, a battery housing is proposed herein, which is formed from plastic and has a semipermeable membrane as a ventilation element and / or exhaust element, wherein the semipermeable membrane is connected to the battery housing in a material-engaging or press-fitting manner.

[0056] Preferably, the semipermeable membrane is configured to be permeable to a certain gaseous substance and impermeable to a certain liquid substance at least until a critical pressure difference is reached.

[0057] Particularly preferably, the semipermeable membrane is configured to be permeable to a gas mixture corresponding to air or similar to air and to be impermeable to a mixture corresponding to water or similar to water at least until a critical pressure difference is reached.

[0058] Particularly preferably, the semipermeable membrane is configured to be permeable to any gaseous substances and impermeable to any liquid substances at least until a critical pressure difference is reached.

[0059] A battery housing formed of plastic is proposed, which has a semipermeable membrane, wherein the semipermeable membrane is configured to be permeable to gaseous substances and impermeable to liquid substances at least before a critical pressure difference is reached, wherein the semipermeable membrane is connected to the battery housing in a material-engaged or press-fitting and non-positive manner.

[0060] The battery housing proposed in this article can be used as a component of a battery housing to ventilate and exhaust the battery housing through a semipermeable membrane.

[0061] A battery housing having a battery housing according to the first aspect of the present invention can prevent liquid penetration, in particular water penetration, at least before a critical pressure difference is reached, because the semipermeable membrane connected to the battery housing is configured to be impermeable to liquid substances at least before a critical pressure difference is reached.

[0062] Preferably, the battery housing is particularly suitable for accommodating components of the battery, so that these components are protected and / or fixed by the battery housing. Particularly preferably, the battery housing is formed by polyamide 6 or glass fiber reinforced polyamide 6, which is conducive to achieving a particularly rigid and strong battery housing.

[0063] The semipermeable membrane preferably has a circular cross-sectional area.

[0064] The semipermeable membrane preferably also can have an elongated extension, wherein the semipermeable membrane can have different cross-sectional shapes, particularly elliptical or a shape formed by a fold line, particularly a square shape, a rectangular shape. In addition, the semipermeable membrane can also have a certain shape, whose basic shape can be formed by a fold line, wherein the angle of the fold line can be rounded.

[0065] The battery housing proposed herein may have one or preferably a plurality of semipermeable membranes.

[0066] The proposed design of the battery housing with a semipermeable membrane connected to the battery housing by material bonding or press fit eliminates the need for a venting element housing as in the prior art, since the semipermeable membrane can be directly connected to the battery housing as a ventilation and venting element.

[0067] Furthermore, additional sealing measures can be dispensed with, since the semipermeable membrane can be connected in a circumferential manner to the battery housing by means of a material connection or a press-fit connection with the battery housing, so that when the battery housing is used as intended, the exchange of substances between the volume enclosed by the battery housing and the environment of the battery housing can only be achieved via the diaphragm surface of the semipermeable membrane of the battery housing.

[0068] Since the semipermeable membrane and the battery housing are connected by material bonding or press-fit, the number of required components is reduced compared to the prior art. In particular, the solution proposed in this article does not require the provision of an independent housing, an independent seal, or additional connecting elements for functional integration of ventilation elements and / or exhaust elements.

[0069] Overall, the solution proposed here can advantageously achieve a lighter overall weight, less installation space requirement and lower overall costs compared to the prior art, wherein the overall costs can be reduced in particular by reducing the costs of required components and a cheaper production process for the battery housing.

[0070] In addition, the battery housing design proposed in this article is also conducive to flexible adjustment in the standardized battery housing design. For example, the ventilation power and / or exhaust power of the semipermeable membrane and the membrane area can be adjusted according to the specific application.

[0071] Preferably, the membrane area of ​​the semipermeable membrane can be adjusted without adjusting the tool used to manufacture the battery housing, in particular by increasing the number of semipermeable membranes connected to the battery housing.

[0072] In particular, the receiving geometry is constructed to receive a plurality of membranes, wherein as an alternative to a semipermeable membrane, a plastic barrier can optionally also be provided which is materially joined or press-fitted to the receiving geometry, so that the number of semipermeable membranes used can be adjusted cost-effectively depending on the specific application.

[0073] Furthermore, the membrane area of ​​the semipermeable membrane can also be adjusted while retaining the receiving geometry, in particular by varying the ratio of the membrane area to the surface area of ​​the membrane area overmolded with plastic.

[0074] In concrete terms, the semipermeable membrane can be injection-molded around the membrane carrier or can be connected to the membrane carrier in a materially bonded manner, wherein the membrane carrier can also have an umbrella-shaped mushroom valve.

[0075] Preferably, the semipermeable membrane is directly connected to the battery housing, wherein the semipermeable membrane and the battery housing are welded or bonded together.

[0076] A battery housing is proposed which is directly connected to a semipermeable membrane in a materially bonded manner.

[0077] This results in a combination of semipermeable membrane and battery housing that is extremely easy to produce and extremely robust.

[0078] According to an advantageous embodiment, the semipermeable membrane is at least indirectly connected to the battery housing, wherein the semipermeable membrane is directly connected to a membrane carrier, wherein the membrane carrier is connected to the battery housing in a press-fit and / or form-fit manner.

[0079] The embodiments proposed here achieve the interchangeability of the semipermeable membrane while retaining the aforementioned advantages, in particular the advantage of a materially bonded connection of the semipermeable membrane to its immediate surroundings.

[0080] The semipermeable membrane is preferably connected to the membrane carrier in a materially bonded manner. The membrane carrier can be easily replaced due to its press-fit and / or form-fit connection to the battery housing, thereby simplifying maintenance and / or servicing measures and / or making them more cost-effective.

[0081] Furthermore, it is advantageous that the design of the battery housing can be adapted to different ventilation configurations of the battery housing, in particular to different national regulations, simply by changing the membrane carrier, without having to adapt the battery housing in each case.

[0082] Advantageously, the semipermeable membrane is welded or bonded to the membrane carrier.

[0083] This facilitates the joining of the membrane carrier and the semipermeable membrane material.

[0084] According to a further advantageous embodiment, the membrane carrier is connected to the battery housing by means of clamping elements.

[0085] The diaphragm carrier and the receiving geometry are preferably connected together by means of a "clamping element" which serves to exert a normal force between the diaphragm carrier and the receiving geometry. Preferably, the clamping element has a plurality of clamping elements which can each generate a force between the diaphragm carrier and the receiving geometry. Preferably, the clamping element is designed locally like a locking ring, in particular in the form of a locking ring according to DIN 471, in particular in the region for connecting the diaphragm carrier to the clamping element.

[0086] This is particularly advantageous for installing and removing the semipermeable membrane.

[0087] Optionally, the membrane carrier is pressed into the battery housing.

[0088] According to an optional embodiment, the semipermeable membrane is welded or bonded to the membrane carrier.

[0089] The following are the explanations of the relevant terms:

[0090] A “welded” connection is understood to be a material-joined connection of at least two components, wherein the components are intermixed with one another at least in the contact region after welding.

[0091] A "bonded" connection refers to a material-bonded connection of at least two components, wherein these components are connected by means of an adhesive. When the at least two components are bonded to one another, they are not mixed together.

[0092] The materially bonded connection preferably refers to welding of the shaped battery housing and the semipermeable membrane using a first heat of the battery housing, wherein the semipermeable membrane is preferably brought into contact with the at least not yet solidified battery housing after the shaping.

[0093] According to another preferred embodiment, the semipermeable membrane is arranged in a mold for forming a battery housing during welding, and then the battery housing is formed, so that the semipermeable membrane is connected to the battery housing material when the battery housing is formed.

[0094] The bonding of the battery housing and the semipermeable membrane refers to connecting the formed battery housing and the semipermeable membrane together at least indirectly by means of an adhesive.

[0095] Preferably, the area of ​​the accommodation geometric structure for accommodating and connecting the semipermeable membrane is directed toward the inner cavity of the predetermined battery housing. Advantageously, this arrangement can better protect the semipermeable membrane from external factors.

[0096] This facilitates a cost-effective, robust and process-stable material-bonded connection between the battery housing and the semipermeable membrane.

[0097] According to an advantageous embodiment, the semipermeable membrane is pressed into the battery housing.

[0098] The following are the explanations of the relevant terms:

[0099] “Pressing in” means that a semipermeable membrane, preferably a semipermeable membrane injection-molded with plastic, in particular a semipermeable membrane injection-molded with a membrane carrier, or a semipermeable membrane connected to a membrane carrier in a material-bonded manner, is introduced into a correspondingly constructed receiving geometry of the battery housing, wherein the receiving geometry of the battery housing has for this purpose a receiving cross section which is at least slightly smaller than a corresponding cross section of the semipermeable membrane, preferably a semipermeable membrane injection-molded with plastic, in particular a semipermeable membrane injection-molded with a membrane carrier, or a membrane carrier connected to a material-bonded manner of the semipermeable membrane, so that an interference fit is at least indirectly established between the receiving geometry of the battery housing and the semipermeable membrane, so that the battery housing and the semipermeable membrane are connected together in a press-fit manner. Preferably, the interference fit between the receiving geometry of the battery housing and the semipermeable membrane, in particular between the receiving geometry of the battery housing and the semipermeable membrane injection-molded with plastic, or between the receiving geometry and the membrane carrier, causes a normal force, so that a relative movement between the semipermeable membrane and the battery housing can be prevented by static friction.

[0100] Preferably, the area of ​​the accommodation geometric structure for accommodating and connecting the semipermeable membrane is directed toward the inner cavity of the predetermined battery housing. Advantageously, this arrangement can better protect the semipermeable membrane from external factors.

[0101] This results in a simple and easy-to-maintain connection between the battery housing and the semipermeable membrane.

[0102] By means of a semipermeable membrane connected to the battery housing by a press-fit, the following particularly advantageous application effect can be achieved: the accommodating geometric structure has a plurality of areas for accommodating the semipermeable membranes, and the number of semipermeable membranes required for the specific application is inserted into the accommodating geometric structure by a press-fit, while the areas that do not need to accommodate the semipermeable membranes are joined by blind cover material or closed by a press-fit.

[0103] Preferably, the connection between the cell housing and the semipermeable membrane is configured to be released at a defined pressure difference, in particular at a pressure difference of more than 50 mbar, preferably at a pressure difference of more than 30 mbar, particularly preferably at a pressure difference of more than 15 mbar.

[0104] The following are the explanations of the relevant terms:

[0105] "Pressure difference" refers to the difference in pressure acting on the membrane on both sides. Pressure difference is a relative variable, where pressure difference refers to the absolute value of the difference in pressure acting on the membrane on both sides. If there is a pressure difference of 10mbar, the pressure acting on the inside or outside of the battery housing may be 10mbar higher than the pressure acting on the other surface of the semipermeable membrane.

[0106] Preferably, the connection between the battery housing and the semipermeable membrane is configured to be released at a pressure difference greater than 200mbar. Preferably, the connection between the battery housing and the semipermeable membrane is configured to be released at a pressure difference greater than 150mbar. Preferably, the connection between the battery housing and the semipermeable membrane is configured to be released at a pressure difference greater than 100mbar. Preferably, the connection between the battery housing and the semipermeable membrane is configured to be released at a pressure difference greater than 70mbar. Preferably, the connection between the battery housing and the semipermeable membrane is configured to be released at a pressure difference greater than 60mbar. Preferably, the connection between the battery housing and the semipermeable membrane is configured to be released at a pressure difference greater than 40mbar. Preferably, the connection between the battery housing and the semipermeable membrane is configured to be released at a pressure difference greater than 20mbar.

[0107] It should be clearly pointed out that the above values ​​for the pressure difference should not be understood as strict limits, and in particular, these values ​​may be exceeded or lowered as the skill of the relevant engineering technicians can be considered without departing from the aspects described in the present invention. In short, these values ​​are used to provide a basis for the magnitude of the pressure difference proposed herein.

[0108] In this way, a battery housing can be provided, wherein the integrated semipermeable membrane as a component of the battery housing in the intended application of the battery housing is configured to separate from the receiving geometry at a defined critical pressure difference, thereby preventing the battery housing from bursting. This critical pressure difference may be the result of a critical event, in particular an overheating of the battery. Therefore, the battery housing proposed in this article is conducive to preventing damage in the event of such an event.

[0109] That is, a battery housing is proposed herein, in which the material-joined or force-fit connection fails at a defined pressure difference between the battery housing and the semipermeable membrane.

[0110] Preferably, the semipermeable membrane and / or the receiving geometry are designed in such a way that the semipermeable membrane separates in the direction of a given battery housing interior.

[0111] Preferably, the semipermeable membrane and / or the receiving geometry are designed in such a way that the semipermeable membrane separates in the direction of the intended battery housing environment.

[0112] According to a first variant, it is specifically proposed herein that the press-fit connection is designed by means of a corresponding geometric structure and / or a corresponding material selection, so that the press-fit connection between the battery housing and the semipermeable membrane fails reversibly when a defined critical pressure difference is reached, so that the semipermeable membrane is separated from the receiving geometric structure. According to this advantageous embodiment, the following particularly advantageous effect can be achieved: the separated semipermeable membrane can be reinserted into the receiving geometric structure, so that the press-fit connection between the semipermeable membrane and the battery housing can be reestablished with less difficulty.

[0113] According to a second variant, the adhesive of the material-bonded connection between the semipermeable membrane and the battery housing can be designed and / or selected in such a way that the material-bonded connection established by means of the adhesive is released when a defined critical pressure difference is reached. In this case, the connection between the semipermeable membrane and the battery housing can also be preferably reconstructed by replacing the adhesive layer used for the connection.

[0114] According to a third variant, in the case of a welded connection between the semipermeable membrane and the battery housing, the housing geometry and / or the semipermeable membrane can be selected and / or designed in such a way that the semipermeable membrane tears, so that the gas exchange between the inner cavity of the battery housing and the environment of the battery housing is less hindered, thereby preventing the battery housing from bursting. In this advantageous embodiment of the battery housing proposed herein, when a defined critical pressure difference is reached, it is not the connection between the semipermeable membrane and the battery housing that fails, but the semipermeable membrane.

[0115] Advantageously, the semipermeable membrane has a calibrated breaking point, wherein the calibrated breaking point is configured to burst at a defined pressure difference, in particular at a pressure difference of greater than 50 mbar, preferably at a pressure difference of greater than 30 mbar, particularly preferably at a pressure difference of greater than 15 mbar.

[0116] The following are the explanations of the relevant terms:

[0117] "Marked breaking point" refers to a location of a semipermeable membrane defined by a particular structure, shape or configuration that will break in a predictable manner when stressed or overloaded, particularly when a defined critical pressure differential is reached.

[0118] In other words, the semipermeable membrane ruptures in a predictable manner under a defined pressure difference by virtue of a particular structure, shape or configuration.

[0119] Preferably, the marked breaking point has a material taper, in particular a notch, so that the semipermeable membrane, at least in the region of the material taper, does not have a constant thickness over its extension. The notch effect acting in the region of the material taper can in particular cause the semipermeable membrane to break in a predictable manner in the event of an overload.

[0120] "Burst" refers to the irreversible failure of a semipermeable membrane, particularly by a defined tear in the membrane.

[0121] Preferably, the connection between the battery housing and the semipermeable membrane is configured to be released at a pressure difference greater than 200mbar. Preferably, the connection between the battery housing and the semipermeable membrane is configured to be released at a pressure difference greater than 150mbar. Preferably, the connection between the battery housing and the semipermeable membrane is configured to be released at a pressure difference greater than 100mbar. Preferably, the connection between the battery housing and the semipermeable membrane is configured to be released at a pressure difference greater than 70mbar. Preferably, the connection between the battery housing and the semipermeable membrane is configured to be released at a pressure difference greater than 60mbar. Preferably, the connection between the battery housing and the semipermeable membrane is configured to be released at a pressure difference greater than 40mbar. Preferably, the connection between the battery housing and the semipermeable membrane is configured to be released at a pressure difference greater than 20mbar.

[0122] It should be clearly pointed out that the above values ​​for the pressure difference should not be understood as strict limits, and in particular, these values ​​may be exceeded or lowered as the skill of the relevant engineering technicians can be considered without departing from the aspects described in the present invention. In short, these values ​​are used to provide a basis for the magnitude of the pressure difference proposed herein.

[0123] This allows the semipermeable membrane to tear in a defined manner and fail when a defined critical pressure difference is reached, so that a pressure balance is quickly established between the two sides of the semipermeable membrane. This allows the pressure in the battery housing to not rise to a level that could cause structural damage to the battery housing when the battery housing proposed in this article is used as a component of a battery housing in the intended manner.

[0124] Optionally, the housing geometry has a bursting member, wherein the semipermeable membrane and the bursting member are configured so that the semipermeable membrane forms an operative connection with the bursting member under a defined pressure difference, so that the semipermeable membrane bursts, in particular under a pressure difference greater than 50 mbar, preferably under a pressure difference greater than 30 mbar, and particularly preferably under a pressure difference greater than 15 mbar.

[0125] The following are the explanations of the relevant terms:

[0126] "Burst member" refers to any structural member that causes irreversible failure of the semipermeable membrane under defined conditions.

[0127] The bursting member refers in particular to a certain sharp-angled geometric structure of the receiving geometric structure, which is configured to cause tearing of the semipermeable membrane when a defined elastic deformation of the semipermeable membrane occurs.

[0128] Preferably, the connection between the battery housing and the semipermeable membrane is configured to be released at a pressure difference greater than 200mbar. Preferably, the connection between the battery housing and the semipermeable membrane is configured to be released at a pressure difference greater than 150mbar. Preferably, the connection between the battery housing and the semipermeable membrane is configured to be released at a pressure difference greater than 100mbar. Preferably, the connection between the battery housing and the semipermeable membrane is configured to be released at a pressure difference greater than 70mbar. Preferably, the connection between the battery housing and the semipermeable membrane is configured to be released at a pressure difference greater than 60mbar. Preferably, the connection between the battery housing and the semipermeable membrane is configured to be released at a pressure difference greater than 40mbar. Preferably, the connection between the battery housing and the semipermeable membrane is configured to be released at a pressure difference greater than 20mbar.

[0129] It should be clearly pointed out that the above values ​​for the pressure difference should not be understood as strict limits, and in particular, these values ​​may be exceeded or lowered as the skill of the relevant engineering technicians can be considered without departing from the aspects described in the present invention. In short, these values ​​are used to provide a basis for the magnitude of the pressure difference proposed herein.

[0130] It is proposed that the housing geometry has a bursting element. If the pressure difference acting on both sides of the semipermeable membrane increases, the semipermeable membrane is deformed due to the pressure acting on it, so that the semipermeable membrane is arched to one side. The arching of the semipermeable membrane increases with the increase of the pressure difference. The bursting element proposed in this article is dimensioned and / or arranged in such a way that the semipermeable membrane is in an active connection with the bursting element when a defined critical pressure difference is reached, so that the bursting element causes the membrane to tear.

[0131] Preferably, the bursting element is shaped and / or arranged in such a way that it forms an operative connection with the semipermeable membrane when the semipermeable membrane is arched toward the intended battery housing interior.

[0132] Preferably, the bursting element is shaped and / or arranged in such a way that it comes into operative connection with the semipermeable membrane when the semipermeable membrane is arched toward the surroundings of the intended battery housing.

[0133] The advantage of this solution is that the semipermeable membrane can tear when a defined critical pressure difference is reached, thereby preventing a structural failure of the battery housing.

[0134] According to a preferred embodiment, the receiving geometry has no undercut.

[0135] The following are the explanations of the relevant terms:

[0136] "Undercut" refers to a construction element that prevents the component from being demoulded in a direction other than the main demoulding direction. In other words, a component "has no undercut" if it can be demoulded in the main demoulding direction.

[0137] In particular, the battery housing can be demolded in its main demolding direction without undercuts in the region of the receiving geometry.

[0138] In other words, a battery housing with a receiving geometry is proposed here which can be demolded in a main demolding direction relative to a parting plane of a mold for forming the battery housing, wherein the mold does not need to have a slide for processing undercuts.

[0139] This can reduce the manufacturing cost of the battery casing proposed in this article.

[0140] Preferably, the receiving geometry has a supporting rib, preferably two supporting ribs, particularly preferably more than two supporting ribs.

[0141] The following are the explanations of the relevant terms:

[0142] "Support rib" refers to a certain rib, in particular a rib formed in a housing geometry, which is configured to support the membrane at least on one side when a pressure difference occurs, in particular a pressure difference that causes the semipermeable membrane to deform in the direction of the support rib, so that the deformation is at least reduced at least in the area directly between the semipermeable membrane and the support rib.

[0143] The longitudinal extension of the supporting ribs is preferably greater than the transverse extension of the supporting ribs.

[0144] Preferably, the receiving geometry has three supporting ribs, further preferably has four supporting ribs, further preferably has five supporting ribs and further preferably has six supporting ribs. According to a preferred embodiment, the receiving geometry has seven supporting ribs, more preferably eight supporting ribs, further preferably nine supporting ribs and further preferably ten supporting ribs. According to an advantageous and preferred embodiment, the receiving geometry has more than ten supporting ribs.

[0145] It should be clearly pointed out that the above values ​​for the number of support ribs should not be understood as strict limits, and that these values ​​may be exceeded or lowered on an engineering scale without departing from the aspects of the present invention. In short, these values ​​are used to provide a basis for the number of support ribs proposed herein.

[0146] Advantageously, one or more supporting ribs can be used to influence the deformation of the semipermeable membrane caused by the pressure difference, thereby reducing the structural space requirement.

[0147] Furthermore, by means of the one or more supporting ribs, the semipermeable membrane is able to withstand relatively high pressure differences before it fails reversibly.

[0148] One or more supporting ribs can also help to provide asymmetric membranes or non-circular membranes with uniform load distribution, because when the semipermeable membrane is supported by one or more supporting ribs, the load distribution in the semipermeable membrane can be influenced, so that semipermeable membranes with complex geometries can be used. This is beneficial to improve the adaptability to specific applications.

[0149] According to a particularly advantageous embodiment, the ventilation opening is slot-shaped.

[0150] The following are the explanations of the relevant terms:

[0151] A "slot-shaped" vent is a vent whose longitudinal extension is greater than its transverse extension. Preferably, the longitudinal extension is at least twice, preferably at least three times, particularly preferably at least four times, the transverse extension.

[0152] This makes it difficult for stones or dirt to pass through the slot-shaped vents in the receiving geometry.

[0153] This makes it possible in particular to prevent dirt particles and / or stones from the surroundings of the intended battery housing from penetrating into the semipermeable membrane and damaging it.

[0154] Particularly preferably, the ventilation opening is arranged in a depression of the receiving geometry.

[0155] The following are the explanations of the relevant terms:

[0156] A “recess” refers to a recess in a receiving geometry, in particular a recess in a receiving geometry on the outside of a battery housing.

[0157] This allows a water jet or a liquid jet of another substance to strike the semipermeable membrane directly from the surroundings of the intended battery housing without being deflected beforehand and thus losing kinetic energy, which can prevent potential damage to the semipermeable membrane.

[0158] According to an alternative embodiment, the semipermeable membrane is injection-molded with plastic, in particular with a membrane carrier, in particular with polyethylene.

[0159] The following are the explanations of the relevant terms:

[0160] A semipermeable membrane which is “injection-coated” with plastic means a semipermeable membrane which is at least partially coated on the surface with plastic.

[0161] "Polyethylene" refers to all known types of polyethylene, in particular high-density polyethylene (PE-HD), linear low-density polyethylene (PE-LLD) and low-density polyethylene (PE-LD).

[0162] By injection molding the semipermeable membrane with plastic, a self-sealing press-fit connection can be produced between the battery housing and the semipermeable membrane injection molded with plastic, which can be achieved without sealing by pressing the semipermeable membrane injection molded with plastic into the receiving geometry.

[0163] Polyethylene advantageously has good sliding properties, so that injection molding of the semipermeable membrane with polyethylene makes it possible to achieve a certain mating surface of the injection-molded semipermeable membrane, which has good sliding properties and is therefore relatively easy to press into the accommodation geometry, especially in the following case: the accommodation geometry of the battery housing has a certain accommodation cross-section for this purpose, which is at least slightly smaller than the corresponding cross-section of the semipermeable membrane, in particular slightly smaller than the corresponding cross-section of the semipermeable membrane injection molded with plastic.

[0164] In addition, the following advantages can be achieved by injection molding the semipermeable membrane with polyethylene: the relatively soft polyethylene is a contact material with an excellent sealing effect, so that in particular in combination with a relatively rigid housing geometry, in particular by a housing geometry composed of polyamide 6, and particularly preferably by a housing geometry composed of fiber-reinforced polyamide 6, a press-fit connection with an excellent sealing effect can be established between the semipermeable membrane and the battery housing.

[0165] Optionally, the semipermeable membrane can be connected in a materially bonded manner to a membrane carrier, in particular a membrane carrier composed of polyethylene.

[0166] Preferably, the battery housing has a separating plane, wherein the receiving geometry is arranged in the battery housing in such a way that the receiving geometry is substantially parallel to the separating plane of the battery housing.

[0167] The following are the explanations of the relevant terms:

[0168] The "parting plane" of the battery housing refers to the plane of the battery housing that is used to open the mold used to form the battery housing.

[0169] The receiving geometric structure extending “substantially parallel to the separation plane” means that the plane of the receiving geometric structure used for connecting with the semipermeable membrane is substantially parallel to the separation plane of the battery housing.

[0170] In the case where the separation plane and the plane of the receiving geometry are not parallel to one another, the angle between the intersecting planes is preferably less than 10°, preferably less than 5°, particularly preferably less than 2°.

[0171] It should be clearly pointed out that the above values ​​for the angles between the planes should not be understood as strict limits, and specifically, these values ​​may be exceeded or lowered on an engineering scale without departing from the aspects of the present invention. In short, these values ​​are used to provide a basis for the size of the angles proposed herein.

[0172] In principle, the arrangement of the receiving geometry in the battery housing can be selected arbitrarily or from a functional or safety-related perspective.

[0173] By having a housing geometry that is substantially parallel to the separation plane of the battery housing, the battery housing can be demolded without bottom cutting when a relatively complex housing geometry is adopted due to functional requirements and an appropriate construction scheme is adopted, thereby reducing the manufacturing cost of the battery housing proposed in this article.

[0174] According to a particularly advantageous embodiment, the battery housing has an inner side, wherein the semipermeable membrane is arranged on the inner side of the battery housing.

[0175] The following are the explanations of the relevant terms:

[0176] The "inside" of the battery housing refers to the side that is located on the inside of the battery casing during intended use of the battery housing.

[0177] This allows more effective use of the supporting rib structure and / or the protective area of ​​the receiving geometry during the functional evaluation.

[0178] In particular, the protective area of ​​the housing geometry can better protect the membrane from external factors. In addition, when the semipermeable membrane is arranged on the inner side of the battery housing, the support ribs can perfectly support the impending deformation of the semipermeable membrane if an overpressure occurs in the inner cavity of the predetermined battery housing.

[0179] Advantageously, the battery housing has an outer side, wherein the semipermeable membrane is arranged on the outer side of the battery housing.

[0180] The advantage of this solution is that the semipermeable membrane can be accessed from the outside of the battery housing and can thus be easily replaced.

[0181] Preferably, the battery housing has an umbrella-shaped mushroom valve, in particular the receiving geometry has an umbrella-shaped mushroom valve, in particular the membrane carrier has an umbrella-shaped mushroom valve.

[0182] The umbrella-shaped mushroom valve can be used to quickly exhaust the battery housing when overpressure occurs in the inner cavity of the battery housing. In particular, in the case of thermal escalation of the battery module, the umbrella-shaped mushroom valve can ensure that the gas volume released in the inner cavity of the battery housing can quickly flow out of the battery housing, thereby not generating internal pressure that harms the structure.

[0183] It is particularly advantageous if the battery housing has a protective cover.

[0184] The protective cover proposed in this article is configured to prevent mechanical loads from affecting the semipermeable membrane and the umbrella-shaped mushroom valve. The protective cover is designed so that a flow channel exists between the protective cover and the battery housing, thereby achieving gas exchange between the inner cavity of the battery housing through the semipermeable membrane and the environment of the battery housing, especially with the battery housing environment outside the protective cover.

[0185] Preferably, the protective cover is configured to improve the electromagnetic compatibility of the battery housing.

[0186] Optionally, the protective cover has a burst member.

[0187] The advantage of this solution is that the semipermeable membrane deflected toward the protective cap bursts at a defined deflection, ie at a defined pressure difference, so that there is less flow resistance for rapid pressure relief in the interior of the battery housing.

[0188] Preferably, the protective cover has a contact element.

[0189] The contact element is configured to be electrically connected to another component. In this way, the existing component can be supplemented by the protective cover, especially by the electrical connection between the existing component and the protective cover, especially by means of the contact element, to improve the electromagnetic compatibility.

[0190] According to one aspect of the present invention, the solution for achieving the above-mentioned purpose is a battery housing, in particular a battery housing for a traction battery of a motor vehicle, which has a battery housing with the features of claim 1, wherein a preferred embodiment can be achieved by a battery housing having the features of any claim subordinate to claim 1.

[0191] It will be appreciated that the advantages of the battery housing described above are directly applicable to a battery housing having such a battery housing, in particular a battery housing for a traction battery of a motor vehicle.

[0192] It should be clearly pointed out that the subject matter of this aspect can be advantageously combined with the subject matter of the aforementioned first aspect of the present invention alone or cumulatively in any combination.

[0193] According to a second aspect of the invention, the solution of the invention for achieving the above-mentioned object is a traction battery, in particular a traction battery for a motor vehicle, which has a battery housing with the features of claim 1, wherein a preferred embodiment can be achieved by a battery housing with the features of any claim dependent on claim 1.

[0194] It will be appreciated that the advantages of the battery housing described above are directly applicable to a traction battery having such a battery housing, in particular a traction battery for a motor vehicle.

[0195] It should be clearly pointed out that the subject matter of the second aspect can be advantageously combined with the subject matter of the previous aspects of the present invention individually or cumulatively in any combination.

[0196] According to a third aspect of the invention, a solution for achieving the above-mentioned purpose is a motor vehicle having a battery housing with the features of claim 1, wherein a preferred embodiment can be achieved by a battery housing having the features of any claim dependent on claim 1.

[0197] The following are the explanations of the relevant terms:

[0198] "Motor vehicle" refers to a vehicle that is driven by an engine. Preferably, the motor vehicle is not confined to tracks, or at least is not permanently track-bound.

[0199] It will be appreciated that the advantages of the battery housing described above are directly applicable to a motor vehicle having such a battery housing.

[0200] It should be noted that the subject matter of the third aspect can be advantageously combined with the subject matter of the foregoing aspects of the present invention individually or cumulatively in any combination.

[0201] According to a fourth aspect of the present invention, the solution of the present invention to achieve the above-mentioned object is a method for manufacturing a battery housing, in particular a battery housing having the features of claim 1, wherein a preferred embodiment can be implemented by a battery housing having the features of any claim dependent on claim 1, comprising the following steps:

[0202] - Forming the battery housing from plastic;

[0203] - providing a semipermeable membrane; and

[0204] The formed battery housing and the semipermeable membrane are connected together by material bonding or press fit.

[0205] The following are the explanations of the relevant terms:

[0206] "Shaping" refers to any shaping of an object to achieve three-dimensional shaping, particularly three-dimensionally shaped battery housings.

[0207] Preferably, shaping means shaping by means of injection molding.

[0208] Preferably, shaping means shaping by means of a die-casting method or a compression molding method. In this case, the molding compound is introduced into the mold cavity of a mold, wherein the mold is heated or heated. The mold cavity is then closed using a pressure piston. Due to the pressure, the molding compound acquires the shape dictated by the mold cavity and the pressure piston.

[0209] "Connecting" refers to any process used to connect the battery housing and the semipermeable membrane together by material bonding or press fit.

[0210] The material-bonded connection preferably refers to a connection by welding. The material-bonded connection particularly preferably refers to the welding of the formed battery housing and the semipermeable membrane under the first heat of the battery housing, wherein preferably, the semipermeable membrane is brought into contact with the battery housing which has not yet solidified at least after the forming. According to another preferred embodiment, the semipermeable membrane is arranged in a mold for forming the battery housing, and then the battery housing is formed, so that the semipermeable membrane is connected to the battery housing materially when the battery housing is formed.

[0211] Preferably, the material-bonded connection also refers to the bonding of the battery housing to the semipermeable membrane.

[0212] The press-fit connection refers in particular to pressing the semipermeable membrane, which is preferably encapsulated by plastic injection molding, into a correspondingly constructed receiving geometry of the battery housing. For this purpose, the receiving geometry of the battery housing has a receiving cross section which is at least slightly smaller than the corresponding cross section of the semipermeable membrane, in particular slightly smaller than the corresponding cross section of the semipermeable membrane encapsulated by plastic injection molding, so that an interference fit is achieved between the receiving geometry of the battery housing and the semipermeable membrane, so that the battery housing and the semipermeable membrane are connected together by press-fit.

[0213] Preferably, the press-fit connection means that the membrane carrier with the semipermeable membrane is pressed into a correspondingly designed battery housing.

[0214] It should be clearly pointed out that the steps of the method can be carried out in the order given, but not necessarily. That is, the steps can also be carried out in a different order. In particular, it should be pointed out that the semipermeable membrane can be provided and then the battery housing can be formed and at the same time or subsequently a material connection can be established between the semipermeable membrane and the battery housing.

[0215] Advantageously, a battery housing, in particular a battery housing having the features of claim 1 , can be produced using the method proposed herein, wherein a preferred embodiment can be achieved by a battery housing having the features of any of the claims dependent on claim 1 .

[0216] It is understandable that the advantages of the battery casing described above can be directly applied to the manufacturing method of the battery casing.

[0217] More advantages, details and features of the present invention can be obtained from the embodiments described below. Specifically:

[0218] Figure 1 : is a schematic cross-sectional exploded view of a region of a battery housing having a housing geometry and a semipermeable membrane according to a first embodiment;

[0219] Figure 2 : is a schematic cross-sectional view of a region of a battery housing having a housing geometry and a semipermeable membrane according to a first embodiment;

[0220] Figure 3 : is a schematic cross-sectional view of a region of a battery housing having a housing geometry and a semipermeable membrane encapsulated by plastic injection molding according to a second embodiment;

[0221] Figure 4 : Schematic diagram of a semipermeable membrane encapsulated by plastic injection molding;

[0222] Figure 5 : is a schematic cross-sectional view of a region of a battery housing having a receiving geometry and a semipermeable membrane encapsulated by plastic injection molding according to a third embodiment;

[0223] Figure 6 : is a schematic cross-sectional view of a region of a battery housing having a receiving geometry, a semipermeable membrane and an umbrella-shaped mushroom valve according to another embodiment;

[0224] Figure 7 : is a schematic cross-sectional view of a region of a battery housing with a receiving geometry and a membrane carrier according to another embodiment, the membrane carrier having a semipermeable membrane and an umbrella-shaped mushroom valve; and

[0225] Figure 8 : is a schematic sectional illustration of a region of a battery housing having a receiving geometry and a membrane carrier having a semipermeable membrane according to a further embodiment.

[0226] In the following description, the same reference numerals represent the same components or the same features, so the description of a component with reference to one figure also applies to other figures to avoid repeated description. In addition, the features described in conjunction with one embodiment can also be used separately in other embodiments.

[0227] exist Figure 1 In the embodiment shown, the region of the battery housing 10 according to the first embodiment has a receiving geometry 20 and a semipermeable membrane 40 , wherein the semipermeable membrane 40 is oriented toward the inner side 12 of the battery housing 10 relative to the receiving geometry 20 .

[0228] The receiving geometry 20 has no undercuts, so that the battery housing 10 can be demolded in a direction (not shown) other than a main demolding direction (not shown).

[0229] The receiving geometry 20 has a connection region 22 which is configured to be connected in a materially engaging manner to a semipermeable membrane 40 (not shown).

[0230] The housing geometry 20 has a surrounding recess 26 and a protective region 24, wherein the protective region 24 is configured to protect the semipermeable membrane 40 from external influences (not shown). In other words, the protective region 24 is configured to block or prevent the semipermeable membrane 40 from being directly touched from the outside (not marked) of the battery housing 10.

[0231] The receiving geometry 20 has a plurality of vents 28 , wherein the vents 28 are slot-shaped and are configured to ventilate and exhaust the semipermeable membrane 40 from an outside (not labeled) of the battery housing 10 .

[0232] Slot-shaped vents 28 are arranged in the recess 26 to enable direct liquid flow (not labeled) from the outside (not labeled) of the battery housing 10 away from the semi-permeable membrane 40 .

[0233] The receiving geometry 20 has a plurality of support ribs 30, which are configured to support the semipermeable membrane 40, so that deformation of the semipermeable membrane is limited by the support ribs 30 (not shown). In this way, the space requirement of the receiving geometry 20 can be reduced.

[0234] The connection region 22 of the receiving geometric structure 20 can be connected to the semipermeable membrane 40 by welding (not shown) or bonding (not shown). When bonding (not shown) is used, an adhesive layer (not shown) needs to be provided on the connection region 22.

[0235] exist Figure 2 In the example shown, the region of the battery housing 10 according to the first embodiment has a receiving geometry 20 and a semipermeable membrane 40 , wherein the semipermeable membrane 40 is connected to the receiving geometry 20 in a connecting region 22 .

[0236] For this purpose, the connection region 22 has an adhesive layer (not shown) between the receiving geometry 20 and the semipermeable membrane 40. It should be explicitly pointed out that the semipermeable membrane 40 and the receiving geometry 20 of the battery housing 10 can also be connected in the connection region 22 of the receiving geometry 20 by welding (not shown).

[0237] exist Figure 3 In the embodiment shown, the region of the battery housing 10 according to the second embodiment has a receiving geometry 20 and a semipermeable membrane 40 , wherein the semipermeable membrane 40 is oriented toward the inner side 12 of the battery housing 10 relative to the receiving geometry 20 .

[0238] The receiving geometry 20 has no undercuts, so that the battery housing 10 can be demolded in a direction (not shown) other than a main demolding direction (not shown).

[0239] The receiving geometry 20 of the battery housing 10 has a connection region 22 which is configured to at least indirectly produce a press-fit connection (not referenced) between the receiving geometry 20 and the semipermeable membrane 40 .

[0240] The semipermeable membrane 40 is injection-molded with plastic (not shown), thereby forming a membrane carrier 42. The membrane carrier 42 of the semipermeable membrane 40 has a matching lip 44, which is configured to facilitate the installation of the semipermeable membrane 40 (not shown) and to improve the sealing between the membrane carrier 42 of the semipermeable membrane 40 and the connection area 22 of the receiving geometric structure 20 (not shown).

[0241] The press-fit connection (not referenced) in the connection region 22 of the receiving geometry 20 between the receiving geometry 20 and the membrane carrier 42 of the semipermeable membrane 40 can advantageously be reversibly released and reconnected.

[0242] The receiving geometry 20 has a plurality of support ribs 30, which are configured to support the semipermeable membrane 40, so that deformation of the semipermeable membrane is limited by the support ribs 30 (not shown). In this way, the space requirement of the receiving geometry 20 can be reduced.

[0243] Figure 4 The semipermeable membrane 40 in the embodiment is injection-molded with a plastic (not labeled), wherein the injection-molded plastic (not labeled) has a certain geometry (not labeled) which forms a membrane carrier 42 , a matching lip 44 , a chamfer 46 and a membrane reinforcement 48 .

[0244] The membrane carrier 42 and the membrane reinforcement 48 are configured to accommodate and reinforce the semi-permeable membrane 40 .

[0245] The membrane carrier 42 has a mating lip 44 configured to facilitate installation of the semipermeable membrane 40 (not shown) and to improve sealing (not shown) between the membrane carrier 42 of the semipermeable membrane 40 and a predetermined connection area (not shown) of a predetermined receiving geometry (not shown).

[0246] Furthermore, the membrane carrier 42 has a chamfer 46 which is configured to facilitate the mounting of the semipermeable membrane 40 (not shown) and to center it during mounting (not shown).

[0247] exist Figure 5 In the embodiment shown, the region of the battery housing 10 according to the third embodiment has a receiving geometry 20 and a semipermeable membrane 40 , wherein the semipermeable membrane 40 is oriented toward the inner side 12 of the battery housing 10 relative to the receiving geometry 20 .

[0248] The semipermeable membrane 40 is injection molded with plastic (not shown) to form a membrane carrier 42. The membrane carrier 42 of the semipermeable membrane 40 has a mating lip 44, which is configured to improve the sealing between the membrane carrier 42 of the semipermeable membrane 40 and the connection area 22 of the receiving geometry 20 (not shown).

[0249] The press-fit connection (not marked) in the connection area 22 of the accommodation geometry 20 between the accommodation geometry 20 and the membrane carrier 42 of the semipermeable membrane 40 can advantageously be reversibly released and reconnected, wherein the fitting lip 44 achieves an additional form-fitting connection (not marked) with the connection area 22 of the accommodation geometry 20 of the battery housing 10.

[0250] The membrane carrier 42 of the semipermeable membrane 40 is preferably injection-molded with polyethylene (not shown), thereby obtaining a relatively soft membrane carrier 42. This makes it possible to easily reversibly connect and disconnect the membrane carrier 42 even with this additional form fit (not shown). In addition, the seal between the membrane carrier 42 and the relatively rigid receiving geometry 20 can be improved in the connection area 22 (not shown).

[0251] Figure 6 The region of the battery housing 10 in the middle has a semipermeable membrane 40 which is directly connected to the receiving geometry 20 of the battery housing 10 in a materially bonded manner.

[0252] Furthermore, the region of the battery housing 10 has an umbrella-shaped mushroom valve 60, which is connected in a form-fitting manner to the receiving geometry 20. In addition to at least one ventilation opening 28 operatively connected to the semipermeable membrane 40, the receiving geometry 20 has at least one further air-conducting opening 28 operatively connected to the umbrella-shaped mushroom valve 60.

[0253] The housing geometry 20 is covered on the outer side 14 of the battery housing 10 by a protective cover 70, which protects the semipermeable membrane 40 and the umbrella-shaped mushroom valve 60 from external factors and improves the electromagnetic compatibility based on the battery housing 10. To this end, the protective cover 70 has at least one contact element 72, which is configured to be connected to other elements (not shown) for improving electromagnetic compatibility.

[0254] The protective cover 70 has a bursting element 50 which is operatively connected to the semipermeable membrane 40 and is configured to burst the semipermeable membrane 40 when a high overpressure is present on the inner side 12 of the battery housing 10 .

[0255] The protective cover 70 is connected to the battery housing 10 in a form-fitting and / or press-fitting manner, in particular to the receiving geometry 20 of the battery housing 10. A flow channel (not numbered) is provided at least partially between the protective cover 70 and the battery housing 10, which is configured to exchange gas between the semipermeable membrane 40 and / or the umbrella-shaped mushroom valve 60 and the outer side 14 of the battery housing 10.

[0256] Figure 7 The area of ​​the battery housing 10 is similar to Figure 6In the embodiment shown, however, the semipermeable membrane 40 and the umbrella-shaped mushroom valve 60 are jointly accommodated by a membrane carrier 42, which is connected with a press fit to the receiving geometry 20. Therefore, the semipermeable membrane 40 is at least indirectly connected to the battery housing 10 by means of the membrane carrier 42.

[0257] The membrane carrier 42 also has ventilation openings (not shown / not labeled) which enable flow exchange between the outer side 14 of the battery housing 10 and the semipermeable membrane 40 and the umbrella-shaped mushroom valve 60 .

[0258] The membrane carrier 42 is connected to the semipermeable membrane 40 in a materially bonded manner and enables a simple exchange of the semipermeable membrane and / or the umbrella-shaped mushroom valve 60 .

[0259] Figure 8 The region of the battery housing 10 in the middle has a membrane carrier 42 connected to the semipermeable membrane material. The membrane carrier 42 is connected to the battery housing 10 by means of a clamping element 80 .

[0260] A sealing member 52 is provided between the membrane carrier 42 and the battery housing 10 , and is configured to seal between the battery housing 10 and the membrane carrier 42 in a normal operating state.

[0261] The clamping member 80 has a plurality of clamping elements 82 which extend radially outward from a central region of the clamping member 80 in a finger-like manner and come into contact with the battery housing 10. A free cross section (not shown) is provided between the clamping elements 82, which, in the case of extremely high pressure differences, in particular caused by thermal expansion of the battery module, enables the higher pressure difference to lift the membrane carrier 42 from the sealing member 52, so that the pressure difference between the inner side 12 and the outer side 14 of the battery housing need not be eliminated only by the semipermeable membrane 40, but can be eliminated by the bypass channel opened thereby. The level of the pressure difference required for this purpose can be determined by the design of the clamping member.

[0262] Furthermore, the battery housing 10 has a protective cover 70 on the outer side 14 .

[0263] Preferably, the protective cap is connected to the membrane carrier 42 and can be fixed together with the membrane carrier 42 in the battery housing 10 by means of a clamping element 80 .

[0264] A flow channel (not labeled) is provided at least partially between the protective cover 70 and the battery housing 10 , which is configured to allow gas exchange between the semipermeable membrane 40 and the outer side 14 of the battery housing 10 .

[0265] Reference numerals list

[0266] 10 Battery housing

[0267] 12 Inside

[0268] 14 Outer side

[0269] 20 Housing geometry

[0270] 22 Connection Area

[0271] 24 Protected Areas

[0272] 26 Depression

[0273] 28 Vents

[0274] 30 Support ribs

[0275] 40 Semipermeable membrane

[0276] 42 membrane carrier

[0277] 44 Matching lip

[0278] 46 Chamfer

[0279] 48 Diaphragm reinforcement

[0280] 50 Explosive Components

[0281] 52 Sealing member

[0282] 60 Umbrella-shaped mushroom valve

[0283] 70 Protective cover

[0284] 72 Contact elements

[0285] 80 Clamping member

[0286] 82 Clamping element

Claims

1. A battery housing (10), in particular a battery housing (10) for a traction battery, wherein the battery housing (10) is formed from plastic, wherein the battery housing (10) has a semipermeable membrane (40), wherein the semipermeable membrane (40) is configured to be permeable to gaseous substances and impermeable to liquid substances, wherein the battery housing (10) has a receiving geometry (20) for the semipermeable membrane (40), wherein the receiving geometry (20) has a ventilation opening (28), wherein the receiving geometry (20) is configured to be connected to the semipermeable membrane (40), wherein the semipermeable membrane (40) is connected to the battery housing (10) by material engagement or press fit, It is characterized in that The battery housing (10) has an umbrella-shaped mushroom valve (60), in particular the receiving geometry (20) has an umbrella-shaped mushroom valve (60), in particular the membrane carrier (42) has an umbrella-shaped mushroom valve (60).

2. The battery housing (10) according to claim 1, characterized in that: The semipermeable membrane (40) is directly connected to the battery housing (10), wherein the semipermeable membrane (40) and the battery housing (10) are welded or bonded together.

3. The battery housing (10) according to claim 1, characterized in that: The semipermeable membrane (40) is at least indirectly connected to the battery housing (10), wherein the semipermeable membrane (40) is directly connected to a membrane carrier (42), wherein the membrane carrier (42) is connected to the battery housing (10) in a press-fit and / or form-fitting manner.

4. The battery housing (10) according to claim 3, characterized in that: The semipermeable membrane (40) and the membrane carrier (42) are welded or bonded together.

5. The battery housing (10) according to any one of claims 3 or 4, characterized in that: The membrane carrier (42) is connected to the battery housing (10) by means of a clamping element (80).

6. The battery housing (10) according to any one of claims 3 to 5, characterized in that: The membrane carrier (42) is pressed into the battery housing (10).

7. The battery housing (10) according to any one of the preceding claims, characterized in that The connection between the battery housing (10) and the semipermeable membrane (40) is configured to be released at a defined pressure difference, in particular at a pressure difference of greater than 50 mbar, preferably at a pressure difference of greater than 30 mbar, particularly preferably at a pressure difference of greater than 15 mbar.

8. The battery housing (10) according to any one of the preceding claims, characterized in that The semipermeable membrane (40) has a calibrated breaking point, wherein the calibrated breaking point is configured to burst at a defined pressure difference, in particular at a pressure difference of more than 50 mbar, preferably at a pressure difference of more than 30 mbar, particularly preferably at a pressure difference of more than 15 mbar.

9. The battery housing (10) according to any one of the preceding claims, characterized in that The housing geometry (20) comprises a bursting member (50), wherein the semipermeable membrane (40) and the bursting member (50) are configured such that the semipermeable membrane (40) forms an operative connection with the bursting member (50) at a defined pressure difference, so that the semipermeable membrane (40) bursts, in particular at a pressure difference of greater than 50 mbar, preferably at a pressure difference of greater than 30 mbar, and particularly preferably at a pressure difference of greater than 15 mbar.

10. The battery housing (10) according to any one of the preceding claims, characterized in that The receiving geometry (20) has no undercuts.

11. The battery housing (10) according to any one of the preceding claims, characterized in that The receiving geometry (20) has one supporting rib (30), preferably two supporting ribs (30), particularly preferably more than two supporting ribs (30).

12. The battery housing (10) according to any one of the preceding claims, characterized in that The ventilation opening (28) is in a slot shape.

13. The battery housing (10) according to any one of the preceding claims, characterized in that The ventilation opening (28) is arranged in a recess (26) of the receiving geometry (20).

14. The battery housing (10) according to any one of the preceding claims, characterized in that The semipermeable membrane (40) is injection-molded with plastic, in particular polyethylene.

15. The battery housing (10) according to any one of the preceding claims, wherein the battery housing (10) has a separation plane, characterized in that: The receiving geometry (20) is arranged in the battery housing (10) in such a way that the receiving geometry (20) is substantially parallel to a separating plane of the battery housing (10).

16. The battery housing (10) according to any one of the preceding claims, wherein the battery housing (10) has an inner side (12), characterized in that: The semipermeable membrane (40) is arranged on the inner side (12) of the battery housing (10).

17. The battery housing (10) according to any one of claims 1 to 15, wherein the battery housing (10) has an outer side (14), characterized in that: The semipermeable membrane (40) is arranged on the outer side (14) of the battery housing (10).

18. The battery housing (10) according to any one of the preceding claims, characterized in that The battery housing (10) has a protective cover (70).

19. The battery housing (10) according to claim 18, characterized in that: The protective cover (70) has a bursting member (50).

20. The battery housing (10) according to any one of claims 18 or 19, characterized in that: The protective cover (70) has a contact element (72).

21. A traction battery, in particular for a motor vehicle, having a battery housing (10) according to any one of claims 1 to 20.

22. A motor vehicle having a battery housing (10) according to any one of claims 1 to 20.

23. A method for manufacturing a battery housing (10), in particular a battery housing (10) according to any one of claims 1 to 20, comprising the following steps: - forming the battery housing (10) from plastic; - providing a semipermeable membrane (40); and - Connecting the formed battery housing (10) and the semipermeable membrane (40) together by material bonding or press-fitting.

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