Energy storage arrangement for a motor vehicle and motor vehicle

Abstract

Energy storage arrangement for a motor vehicle, comprising several energy storage devices (1), wherein at least one energy storage device (1) comprises a housing part (2) in which at least one electrical energy storage cell (4) and at least one electrical connecting element (11) are arranged, wherein the electrical energy storage cell (4) is electrically connected by means of the at least one electrical connecting element (11) to external electrical connection means (12) arranged or formed on at least one exposed outer wall section of the housing part (2), wherein the at least one electrical connecting element (11) is at least partially surrounded by at least one electromagnetic damping element (13) for damping electromagnetic emissions, wherein the electromagnetic damping element (13) is arranged in the housing part (2).

Description

The invention relates to an energy storage arrangement for a motor vehicle, comprising a plurality of energy stores.It is known in the field of automotive engineering that the electromagnetic emissions emitted by certain components can escape from a region shielded with respect to electromagnetic emissions via certain electromagnetic "coupling or interference paths", such as e.g. electrical line connections.Corresponding components are, in particular, power or control electronics for electrified drives, typically energy storage arrangements on the motor vehicle side, typically comprising a plurality of electrical energy stores, or batteries for short. The latter typically form corresponding electromagnetic coupling or interference paths to the vehicle mass or vehicle body.Different shielding possibilities are known from the prior art. For example, DE 20 2012 104 339 U1 discloses a battery tray for a traction battery of an electric vehicle. The battery tray comprises a receiving body for receiving the traction battery, which body consists at least partially of a thermoplastic or thermosetting plastic material. The battery tray comprises a first planar element, which is at least partially made of copper and / or aluminum, for shielding an environmental region of the battery tray and / or for shielding the traction battery from electromagnetic radiation. In addition, the battery tray comprises at least one further planar element, wherein the further planar element consists at least partially of a soft magnetic material and / or the first planar element additionally consists of a soft magnetic material.Besides, JP 2012 028 023 A discloses a battery having a battery element made up of a plurality of stacked secondary battery elements, at the poles of which two connections are provided. The battery element and the terminals are enclosed by a laminate layer formed by a metal layer and a resin layer. The resin layer serves as an insulator, while the metal layer forms a housing for the battery and assumes the function of electromagnetic shielding or damping. For this purpose, the entire battery is enclosed by the metal layer.Previous measures for reducing electromagnetic emissions or for damping or filtering electromagnetic emissions comprise measures according to which damping devices are typically provided in the region of corresponding power or control electronics and / or in the region of corresponding energy storage arrangements. These damping devices are separate assemblies which require a relatively large amount of the installation space typically being slightly dimensioned in any case on the motor vehicle side.The object of the invention is to specify an improved concept for an energy storage arrangement for a motor vehicle.The object is achieved by an energy storage arrangement according to patent claim 1 and by a motor vehicle according to patent claim 12.The invention thus relates to a particular approach for implementing measures for attenuating or filtering electromagnetic emissions and provides for integration of means suitable for attenuating or filtering electromagnetic emissions into an electrical energy store. At least one measure suitable for damping or filtering electromagnetic emissions is therefore integrated into the energy store.The measure is realized by an electromagnetic damping element which is structurally embodied or designed in such a way that it is suitable for damping or filtering electromagnetic emissions. Attenuation or filtering of electromagnetic emissions is also to be understood in particular as meaning, in particular, a derivation and / or reduction of electromagnetic emissions or electromagnetic interference.In general, the electromagnetic damping element, which is referred to below for short as damping element, can be an inductance, a resistance, in particular an impedance, e.g. in the form of an EMC core or a ferrite core, or a capacitance, or the damping element can comprise corresponding components. In other words, the damping element thus generally serves for implementing an electromagnetic compatibility (EMC) measure integrated into a corresponding energy store, or, for short, an EMC measure, or for promoting or increasing it.Depending on the specific design or condition of the damping element, it can be designed specifically for damping electromagnetic emissions of specific frequencies or specific frequency ranges. For example, it is possible that the damping element is suitable for damping electromagnetic emissions with frequencies above 100 kHz, typically in a range between 100 kHz and 1 GHz, in particular in a range between 100 KHz and 100 MHz. Of course, different damping elements can also be provided, which respectively damp electromagnetic emissions of a specific frequency range, so that overall damping of electromagnetic emissions in a wide frequency range can be realized via a plurality of such damping elements.The invention is based in particular on the use of the typically unused installation space present within a corresponding energy store, i.e. within a typically cuboidal or prismatic housing part associated therewith, for the arrangement or integration of at least one corresponding damping element. This installation space typically results from corresponding inner wall sections on the housing part side delimiting a housing part-side receiving space for receiving at least one energy storage cell and the at least one energy storage cell received in the housing part or a corresponding housing part-side receiving space. The installation space usable for integrating corresponding damping elements is thus individually predefined or individually determined for differently configured energy stores, i.e. in particular depending on the number and external shape of respective energy store cells accommodated in the housing part.The damping element is therefore typically arranged in the installation space existing between at least one inner wall section of the housing part and the at least one energy storage cell, filling it at least in sections, in particular completely. In principle, it is desirable that the damping element or the damping elements fill or fill this installation space as extensively as possible, i.e. in particular completely, since the damping of electromagnetic emissions is improved in this way.Overall, a highly integrated energy store is realized with at least one damping element arranged within an energy store-side housing part and thus with at least one damping element integrated into an energy store.The damping element surrounds an electrical connecting element, at least in sections, which extends between corresponding inner electrical connection means of the energy storage cell(s) arranged within the housing part and corresponding outer electrical connection means arranged or formed on at least one exposed outer wall section of the housing part. This electrical connection element, which consequently serves to electrically contact or connect corresponding inner electrical connection means to corresponding outer electrical connection means, is typically a strip-like or rail-like electrical line connection. The electrical connection element can thus be referred to or considered as a conductor rail.The formulation that the damping element surrounds the electrical connection element at least in sections is not necessarily to be understood as meaning a direct or indirect contact between the surrounding damping element and the electrical connection element surrounded by the latter at least in sections. Consequently, a free space can also be formed between the damping element and the electrical connecting element; the damping element thus neither mechanically nor electrically contacts or contacts the electrical connecting element. It is of course nevertheless conceivable for the electromagnetic damping element to contact or contact the at least one electrical connecting element at least in sections. The contact between the damping element and the electrical connecting element can be formed directly or indirectly, i.e. with the interposition of at least one further component. In all cases, the damping element or elements are located within the energy store or within the housing part on the energy store side.The energy store is to be seen as a basic unit of an electrical energy store arrangement for a motor vehicle comprising a plurality of energy stores electrically connected to one another. Such an energy storage arrangement serves for the electrical supply of consumers on the motor vehicle side, such as, for example, an electrified motor vehicle-side drivetrain or a motor vehicle-side electric machine serving as a drive unit. In general, both high-voltage and low-voltage consumers on the motor vehicle side can be electrically supplied via the energy storage arrangement which is subsequently to be referred to as a battery or to be considered. High-voltage consumers and low-voltage consumers are defined in relevant standards. High-voltage consumers are in automotive engineering, in particular hybrid and fuel cell technology and electric motor vehicles, typically such electric consumers which are operated in a DC voltage range between 60 and 1500 volts or in an AC voltage range between 30 and 1000 volts. Electrical loads which are operated in correspondingly lower voltage ranges are accordingly low-voltage loads.An energy storage cell arranged within the energy storage-side housing part is an electrochemical structural unit which typically comprises two electrodes (anode, cathode), a separator arranged between them and an electrolyte. The energy storage cell can be a lithium cell, for example. The energy storage cell can be sheathed by at least one sheathing element, for example in the form of a film formed for example from a plastic material. The electrodes are typically electrically connected via electrode-side electrical connection means by means of the at least one electrical connection element to the outer electrical connection means arranged or formed on exposed outer wall sections of the housing part. The electrode-side electrical connection means generally correspond to the aforementioned internal electrical connection means.As mentioned, the integration of at least one damping element into an energy store realizes a highly integrated assembly which, for example, dampens or filters electrical disturbances based on current and / or voltage fluctuations and the associated electromagnetic emissions. This likewise excludes or reduces the possibility of impairing the stability of an energy storage arrangement comprising a plurality of energy stores, or in short of a battery.The immunity of a corresponding energy storage arrangement to interference can thus be improved, in particular with regard to a potential electromagnetic interference environment provided by the motor vehicle comprising the energy storage arrangement. There is no impairment of the function or performance of the energy storage arrangement or of the energy stores forming the latter by the at least one damping element.In a first embodiment, the damping element can be a shaped body formed from at least one magnetic material. The damping element is to be considered here as inductance or impedance. The shaped body is typically a sintered part, i.e. a component produced by means of a sintering process. The shaping of the shaped body can take place during production, i.e. during the sintering process. In this case, in principle, shaped bodies with arbitrary geometries can be realized. The molded body can thus be individually manufactured in its three-dimensional physical shape with regard to a given energy storage construction, i.e. in particular with regard to a construction space situation within a housing part determined by it.The magnetic material forming the shaped body is, for example, ferrite or a ferritic compound, in particular manganese-zinc ferrite, exemplary composition Mn a Zn (1-a) Fe 2 O 4, or nickel-zinc ferrite, typical composition Ni a Zn (1-a) Fe 2 O 4. The shaped body can thus be referred to or considered as an EMC core or as a ferrite core.The shaped body is expediently constructed or designed in such a way that it surrounds the outer periphery of the at least one electrical connection element at least in sections in its longitudinal direction and / or in its circumferential direction. The same applies in general form and thus in principle also to the damping element. As mentioned, the geometric shape of the molded body and thus also of the damping element is to be selected depending on the design conditions of the energy store, i.e. in particular the supply of available installation space within the housing part. In principle, it is desirable that the molded body or the damping element completely surrounds the electrical connecting element as far as possible both in the longitudinal direction, i.e. in the direction of the longitudinal extent of the electrical connecting element, and in the circumferential direction.As mentioned, the molded body can basically be individually manufactured in a three-dimensional physical shape to be selected with regard to a given energy storage construction, i.e. in particular with regard to a space available within a housing part determined by this. It follows from this that the molded body can have fundamentally any desired cross-sectional geometries. The molded body can thus have, for example, a cross section which is round at least in sections and / or angular at least in sections. The shaped body can thus be configured, for example, as a ring or hollow cylinder or rectangular parallelepiped or with an optionally perforated, annular or cylindrical or rectangular basic shape. Corresponding perforated annular or cylindrical or cuboidal basic shapes result in, for example, C- or U-shaped cross-sectional geometries. Of course, other cross-sectional geometries are also conceivable in principle.In a second embodiment, the damping element is designed as an electrical capacitor or comprises at least one electrical capacitor. The damping element is to be considered here as a capacitance. Although, as mentioned, a physical-mechanical contact between the damping element and the electrical connection element is fundamentally not absolutely necessary, in this embodiment, electrical contact must typically be provided between the electrical connection element and the damping element, i.e. the capacitor.It is of course possible to provide both damping elements according to the first embodiment and damping elements according to the second embodiment.The invention relates to an energy storage arrangement for a motor vehicle. The energy storage arrangement comprises a plurality of energy stores electrically connected to one another, i.e. typically connected in series. At least one energy store of the energy storage arrangement is an energy store as described above, i.e. an energy store having at least one corresponding damping element. The energy storage arrangement is in particular a rechargeable battery for the electrical supply of various electrical consumers on the motor vehicle side. The energy storage arrangement is therefore connected in particular into an on-board power supply system of a motor vehicle. All explanations in connection with the energy store apply analogously to the energy store arrangement.A particular advantage of the described energy store is evident in connection with a corresponding energy store arrangement. This advantage is that the energy storage arrangement can be equipped as required or in a targeted manner with conventional energy stores and energy stores corresponding to the principle according to the invention. It is of course also conceivable to retrofit existing energy storage arrangements with at least one energy storage device according to the principle according to the invention. In any case, it is possible to realize a need-based or targeted damping or filtering of electromagnetic emissions. The measure and the localization of the damping or filtering can be influenced in particular via the number and arrangement of the energy stores.The invention further relates to a motor vehicle comprising at least one corresponding energy storage arrangement. All explanations in connection with the energy store and in connection with the energy store arrangement apply analogously to the motor vehicle.Further advantages, features and details of the invention are evident from the exemplary embodiments described below and on the basis of the drawings. The following are shown: FIGS. 1-3 each show a schematic illustration of an energy store according to an exemplary embodiment; and FIG. 4 shows a schematic illustration of an energy storage arrangement on the motor vehicle side according to an exemplary embodiment of the invention.FIGS. 1-3 each show a schematic illustration of an electrical energy store 1 according to an exemplary embodiment. In this case, FIG. 1 shows a perspective illustration of the energy store, FIG. 2 shows a vertical section through the energy store 1 according to the section lines II-II shown in FIG. 1, and FIG. 3 shows a horizontal section through the energy store 1 according to the section lines III-III shown in FIG. 1.The energy store 1 comprises a cuboidal housing part 2. the housing part 2 is formed, for example, from aluminum or an aluminum compound. The housing part 2 delimits in its interior, i.e. by means of corresponding inner wall sections, an equally cuboidal receiving space 3 (cf. FIGS. 2, 3 ) which serves for receiving at least one energy storage cell 4. In the receiving space 3, at least one energy storage cell 4, in particular an energy storage cell which is likewise rectangular and thus prismatic, can thus be accommodated.An energy storage cell 4 comprises, as can be seen in particular from FIG. 2, a plurality of, in particular electrochemical, functional components. These include, in particular, two electrodes 5, 6 in the form of an anode and a cathode, a separator 7 arranged between the electrodes 5, 6 and an electrolyte 8, The functional components of the energy storage cell 4 are accommodated in a casing element 9, which consists of a film formed from a plastic material. It is conceivable for a multiplicity of corresponding functional components to be located within the enveloping element 9 in the described arrangement. The illustration of the energy storage cell 4 shown in FIG. 2 is therefore purely schematic.For all cases, it applies that the energy storage cell 4 has electrical connection means 10, which are referred to below as internal electrical connection means 10. The inner electrical connection means 10 are electrically connected via respective rail-shaped electrical connection elements 11 to outer electrical connection means 12 arranged or formed on an exposed outer wall section of the housing part 2. The exposed outer wall section is provided in the exemplary embodiments shown in the figures by the upper side of the housing part 2.The electrical connecting elements 11 are each surrounded by a ring-shaped and thus hollow cylindrical damping element 13, viewed in cross section, for damping or filtering electromagnetic emissions. In this case, a contact can be provided in each case between a damping element 13 and the electrical connecting element 11 surrounded by the damping element. However, this is not absolutely necessary.The damping elements 13 completely surround the respective electrical connecting elements 11 both in the longitudinal direction and in the circumferential direction, since this allows the unused installation space within the housing part 2. If the unused installation space present within the housing part 2, which generally represents a partial space of the housing part-side accommodation space 3, is smaller or larger, the respective damping elements 13 have to be dimensioned differently in terms of their physical physical shape.In principle, it is desirable that the damping elements 13 completely fill the unused installation space present between the inner wall sections of the housing part 2 delimiting the receiving space 3 and the energy storage cell 4 arranged in the receiving space 3.The damping elements 13 are present as shaped bodies formed from magnetic materials, i.e. in particular ferrite, typically Fe 2 O 3. These are sintered parts which have been produced by means of a sintering process. Typically, the shaping of the shaped bodies or of the damping elements 13 takes place equally within the scope of the sintering process.In principle, it is also conceivable to configure the damping elements 13 as capacitors, wherein electrical contacting is to be provided between the electrical connecting elements 11 and the damping elements 13.FIG. 4 shows a schematic illustration of an energy storage arrangement 14 on the motor vehicle side according to an exemplary embodiment of the invention. The energy storage arrangement 14 generally serves for the electrical supply of various electrical consumers (not shown) on the motor vehicle side, i.e. installed in a motor vehicle (not shown). The energy storage arrangement 14 serves here, for example, to supply at least one electric machine (not shown) serving as a drive unit of the motor vehicle, i.e. an electric motor. Between the energy storage arrangement 14, which is to be referred to or to be considered as a high-voltage battery, and the electric machine, control electronics (not shown) for controlling the power consumption of the electric machine are typically connected.The energy storage arrangement 14 comprises a number of energy stores 1 which are electrically connected to one another, i.e. connected in series. certain energy stores 1 can be designed here in accordance with the exemplary embodiment shown in FIGS. 1-3. Other energy stores can be configured conventionally, i.e. without integrated damping elements 13. All energy stores 1 forming the energy store arrangement 14 are held in a frame-like holding device 15.By integrating corresponding damping elements 13 into an energy store 1, a highly integrated assembly is realized which, for example, dampens or filters electrical disturbances due to current and / or voltage fluctuations and the associated emission of electromagnetic emissions. This likewise precludes or reduces the possibility of impairing the stability of the energy storage arrangement 14 without making structural changes to the latter.The immunity of the energy storage arrangement 14 to interference can thus be improved, in particular with regard to a potential electromagnetic interference environment provided by the motor vehicle comprising the energy storage arrangement 14. There is no impairment of the function or performance of the energy storage arrangement 14 or of the energy stores 1 forming the latter by the damping elements 13.

Claims

Energy storage arrangement for a motor vehicle, comprising a plurality of energy stores (1), wherein at least one energy store (1) comprises a housing part (2) in which at least one electrical energy storage cell (4) and at least one electrical connecting element (11) are arranged, wherein the electrical energy storage cell (4) is electrically connected by means of the at least one electrical connecting element (11) to external electrical connection means (12) arranged or formed on at least one exposed outer wall section of the housing part (2), wherein the at least one electrical connecting element (11) is surrounded at least in sections by at least one electromagnetic damping element (13) for damping electromagnetic emissions, wherein the electromagnetic damping element (13) is arranged in the housing part (2).Energy storage arrangement according to Claim 1, characterized in that the electromagnetic damping element (13) is arranged in the installation space existing between at least one inner wall section of the housing part (2) and the at least one energy storage cell (4) in a manner filling it at least in sections, in particular completely.Energy storage arrangement according to Claim 1 or 2, characterized in that the electromagnetic damping element (13) does not touch or at least partially touch the at least one electrical connection element (11).Energy storage arrangement according to one of the preceding claims, characterized in that the electromagnetic damping element (13) is a shaped body formed from at least one magnetic material.Energy storage arrangement according to Claim 4, characterized in that the magnetic material is ferrite or a ferritic compound, in particular manganese-zinc ferrite or nickel-zinc ferrite.Energy storage arrangement according to Claim 5, characterized in that the shaped body surrounds the outer periphery of the at least one electrical connection element (11) at least in sections in the longitudinal direction and / or in the circumferential direction.Energy storage arrangement according to Claim 5 or 6, characterized in that the shaped body has a cross section which is round at least in sections and / or angular at least in sections.Energy storage arrangement according to Claim 7, characterized in that the shaped body is designed as a ring or hollow cylinder or cuboid with an optionally perforated, annular or cylindrical or cuboid basic shape.Energy storage arrangement according to one of the preceding claims, characterized in that the electromagnetic damping element (13) is designed as an electrical capacitor or comprises at least one electrical capacitor.Energy storage arrangement according to one of the preceding claims, characterized in that the housing part (2) is of cuboidal design.Energy storage arrangement according to one of the preceding claims, characterized in that an energy storage cell (4) comprises at least two electrodes (5, 6), at least one separator (7) arranged or formed between the at least two electrodes (5, 6) and at least one electrolyte (8), wherein the electrodes (5, 6) are electrically connected via electrode-side electrical connection means (10) by means of the at least one electrical connection element (11) to the outer electrical connection means (12) arranged or formed on an exposed outer wall section of the housing part (2).Motor vehicle, comprising at least one energy storage arrangement (14) according to one of the preceding claims.

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