Wire mesh arrangement for shielding electromagnetic radiation and housing for an electrical energy storage device

Abstract

The invention relates to a wire mesh arrangement (D) for shielding a housing of an electrical energy storage device from electromagnetic radiation, comprising an electrically insulating core element (3) and an electrically conductive wire mesh (2) which encloses the core element (3) along its longitudinal axis. According to the invention, the wire mesh arrangement (D) has at least one clamp element (1) for the positive and non-positive connection of two ends (E) of the core element (3) enclosed by the wire mesh (2) to form a loop. The invention further relates to a housing comprising such a wire mesh arrangement (D).

Description

The invention relates to a wire netting arrangement for shielding electromagnetic radiation of a housing of an electrical energy store, comprising an electrically insulating core element and an electrically conductive wire netting, which encloses the core element along its longitudinal axis. The invention further relates to a housing for an electrical energy store.U.S. Pat. No. 11 792 966 B2 discloses a flexible laminate for shielding electromagnetic radiation. The laminate comprises a metal foil and a planar substrate made of a fiber material, foil material or foam material, wherein the laminate comprises a plurality of objects which are formed by cuts into a base surface of the laminate. Each object of the plurality of objects has two or more cuts having a common starting point, wherein the like or more cuts or each of the two adjacent cuts of the two or more cuts define an angle of 45° of 160°. Each cut of the two or more cuts completely perforates the metal foil and the sheet substrate.Moreover, US 2022 / 0247028 A1 describes a battery pack housing for a battery pack, which has a plurality of battery cells. The battery pack case includes a bezel frame having a plurality of walls arranged to surround the battery cells; and a top plate fixed to the walls of the bezel frame and forming a top surface of the battery pack case. The top plate is secured to the enclosure frame using an adhesive, the top plate being removable from the enclosure frame for access to internal components of the battery pack.Furthermore, US 2023 / 0291055 A1 discloses a battery module having a housing element made of a metallic material and a cover element made of a metallic material, wherein the housing element and the cover element are connected to one another by a plurality of screw connections. A common interior space is formed by means of the housing element and the cover element for receiving a plurality of battery cells, wherein an electrical contact is established between the housing element and the cover element.U.S. Pat. No. 11 616 267 B2 describes a modular system for a traction battery of a vehicle having a plurality of battery modules, each battery module comprising a modular housing in which a plurality of battery cells are arranged. Each modular housing comprises a housing shell and two housing covers which cover each end of the housing shell, wherein the housing shell and the two housing covers delimit a liquid-tight chamber in which the battery cells are arranged. Each of the battery modules can be fastened independently to an underside of the vehicle via a mechanical interface, wherein one of the two housing covers of each housing is provided with a coolant connection for exchanging a coolant provided by a cooling system of the vehicle with a respective battery module.DE 10 2021 115 269 A1 relates to the use of a laminate comprising a) at least one metal foil, wherein the metal foil has a thickness of 3 to 250 μm, and b) a planar substrate comprising a nonwoven fabric having a quotient of the maximum tensile force, determined according to ISO 9073-3:1989(E), longitudinally to transversely of 1:2 to 2:1, wherein the laminate has a maximum tensile force, determined longitudinally and / or transversely according to ISO 9073-3:1989(E) in the range of 50 to 800 N / 5 cm and an elongation, determined longitudinally and / or transversely according to ISO 9073-3:1989(E), of less than 30%, for shielding electromagnetic beams.The invention is based on the object of specifying a wire netting arrangement for shielding electromagnetic radiation and a housing for an electrical energy store.The object is achieved according to the invention by a wire netting arrangement which has the features specified in claim 1 and by a housing which has the features specified in claim 9.Advantageous embodiments of the invention are the subject matter of the dependent claims.A wire mesh arrangement for shielding electromagnetic radiation of a housing of an electrical energy store comprises an electrically insulating core element and an electrically conductive wire mesh, which surrounds the core element along its longitudinal axis. According to the invention, at least one clamping element is provided for the form-fit and force-fit connection of two ends of the core element sheathed by means of the wire braid in order to form a loop.By means of the clamping element, the two ends of the sheathed core element can be connected to one another in a comparatively simple manner, without particles becoming detached from the ends of the wire braid on account of a connecting technique and, as a result, the dissolved metallic particles being introduced, which can result in a system failure within the electrical energy store.In addition, the core element sheathed by means of the wire braid can be arranged on the housing in a captive manner by means of the clamping element, with the result that no undercut groove is required for arranging the sheathed core element.The two ends of the sheathed core element can be connected to one another by means of the clamping element, so that no electrically insulating adhesive tape and no adhesive need be used to form the loop. By using the clamping element, an entire transition surface can be used, wherein an electrical conductivity of the sheathed core element is unreduced.In one embodiment, the clamping element is arranged displaceably in a delivery state along the longitudinal axis of the core element sheathed by means of the wire braid. As a result, the clamping element can be positioned where the ends of the sheathed core element are to be connected to one another to form a loop by bending the clamping element and / or twisting it with the clamping element. A length of the loop is thus largely freely selectable, so that the sheathed core element can be cut to length at a specific dimension and connected to its further end.In one possible embodiment, the clamping element, in its delivery state, has a trapezoidal shape in cross section with an opening formed between two limbs. By means of the opening, the clamping element can be arranged on the core element sheathed with the wire braid, wherein the sheathed core element is pressed through the opening into an interior space of the clamping element. Alternatively, the clamping element can also be pushed onto the sheathed clamping element.In one embodiment, the clamping element is made of an electrically conductive material and / or is formed so as to be plastically deformable, so that the clamping element is held on the sheathed core element by bending the legs in a force-fit and form-fit manner, in particular for connecting the ends of the core element sheathed by means of the wire braid. In addition, since the clamping element is formed from an electrically conductive material, the shielding of the electromagnetic radiation of the wire netting is not interrupted in a connecting region formed by means of the clamping element. For example, the clamping element is formed from steel and / or at least one non-ferrous metal.In a further embodiment, the respective leg of the clamping element is bent in an assembled state when the loop is formed in the direction of the respective other leg and in the direction of the core element. As a result, the sheathed core element is arranged in sections within the clamping element in order to connect the two ends in a force-fit and form-fit manner.In one embodiment, the core element is formed from an elastomer and / or polyurethane foam and / or from silicone, in order to ensure, for example, in addition to shielding electromagnetic radiation, a sealing function, in particular for the housing of the electrical energy store.In order to bend the legs of the clamping element in the direction of the sheathed core element for connecting the ends of the sheathed core element and thus to produce a force fit and form fit with respect to the sheathed core element, the core element is elastically deformable in a predeterminable region. For example, the core element is compressible up to 80%, i.e. elastically deformable.In a further embodiment, the core element sheathed by means of the wire braid is designed as a sealing element and is arranged, for example, for sealing between a box-shaped housing part and a housing cover of the electrical energy store.The invention furthermore relates to a housing for an electrical energy store having a box-shaped housing part and a housing cover and a wire mesh arrangement which is arranged circumferentially between the housing part and the housing cover for shielding electromagnetic radiation.By means of the core element sheathed by means of the wire braid and the clamping element, a loop can be formed without the shielding of electromagnetic radiation of the wire braid being influenced.Exemplary embodiments of the invention are explained in more detail below with reference to drawings.The following are shown: FIG. 1 schematically shows a loop formed by means of a wire braid arrangement, FIG. 2 schematically shows a sectional illustration of the wire netting arrangement with a clamping element in its delivery state, FIG. 3 schematically shows a sectional illustration of the wire netting arrangement with a clamping element in an assembled state, FIG. 4 schematically shows a sectional illustration of the wire netting arrangement directly in front of the clamping element in the delivery state, FIG. 5 is a schematic perspective view of an enlarged detail of a connecting point formed by means of the clamping element; and FIG. 6 schematically shows a perspective view of an enlarged partially transparent cutout of a connection point formed by means of the clamping element.Corresponding parts are provided with the same reference numerals in all figures.FIG. 1 shows a perspective view of a loop formed by means of a wire netting arrangement D.FIG. 2 shows a sectional illustration of the wire netting arrangement D with a clamping element 1 in its delivery state A, and FIG. 3 shows a sectional illustration of the wire netting arrangement D with the clamping element 1 in an assembled state M.FIG. 4 shows a sectional view of the wire netting arrangement D directly in front of the clamping element 1 in its delivery state A.FIG. 5 shows a perspective view of an enlarged detail of a connection point formed by means of the clamping element 1 of two ends E of an electrically insulating core element 3 sheathed by means of a wire braid 2, and FIG. 6 shows a perspective view of an enlarged partially transparent detail of the connection point formed by means of the clamping element 1.It is generally known that, in the case of a core element 3 sheathed by means of a wire braid 2 for shielding electromagnetic radiation, there is the problem if the sheathed core element 3 is cut to a predetermined length, the wire braid 2, in particular its meshes, is cut. This circumstance cannot be avoided because of the process. Parts of the cut meshes are loose and can thus be introduced as metallic particles, for example into a housing of an electrical energy store, as a result of which a system failure can occur within the electrical energy store.In addition, a captive installation of the core element 3 sheathed by means of the wire braid 2 is possible in such a housing essentially exclusively by means of a groove with an undercut, since a prevention for a volume compensation in the groove is required.Furthermore, in order to form a loop by means of the sheathed core element 3, both ends of the sheathed core element 3 are usually joined by means of adhesive and / or wound around by means of adhesive tape. This has the consequence that an electrical conductivity may partially not be present or a contact resistance is too high.In order to form a loop by means of the core element 3 which is sheathed by means of the wire braid 2 and is formed from an elastomer, polyurethane foam and / or from silicone and is elastically deformable, without the electrical conductivity of the wire braid 2 being interrupted or impaired, the wire braid arrangement D is formed as described below.The wire braid assembly D includes the wire braid 2, the core member 3 covered thereby, and a number of metallic clamp members 1 disposed on the covered core member 3. Such a wire mesh 2 is also referred to as a wire mesh.Before the clip member 1 is used to form the loop, the clip member 1 has a delivery state A as shown in FIG. 2.The clamping element 1 is designed depending on its requirements and is formed from steel and / or at least one non-ferrous metal.In the delivery state A, the clamping element 1 has substantially a trapezoidal shape, wherein two legs S are formed by means of an opening O. For example, the clamping element 1 is arranged displaceably on the sheathed core element 3 in the delivery state A.If it is provided to form a loop by means of the core element 3 sheathed by means of the wire braid 2, as is shown in FIG. 1, wherein a length of the sheathed core element 3 can vary, the two ends E of the core element 3 sheathed by means of the wire braid 2 are connected by means of the clamping element 1.For this purpose, the two ends E are inserted into the clamping element 1, as shown in FIGS. 5 and 6. Subsequently, the two legs S are bent in the direction of the respective other leg S and in the direction of the core element 3, whereby the core element 3, which is sheathed by means of the wire braid 2, i.e. the respective end E, is elastically deformed and the two ends E are held in a force-fit and form-fit manner by means of the clamping element 1. Manual and / or automated devices can be used to connect the ends E by means of the clamping element 1.The clamping element 1, which now has its mounting state M, contacts the wire netting 2 so that the shielding of electromagnetic radiation is not interrupted. For example, the ends E are damaged. In this context, "waste" is to be understood as meaning that the ends E having a cutting surface are sealed, and that detachment of metallic particles from the ends E can be ruled out to the greatest possible extent.Geometrically, the clamping element 1 is formed depending on a gap to be bridged between the ends E and a material of the core element 3, wherein geometrical and / or physical limits are given. A thickness of the legs S is defined depending on a selected material of the clamping element 1 and the material of the core element 3, wherein a thickness of 0.1 mm is not undershot, for example 0.15 mm or 0.2 mm.If it is provided to arrange the wire netting arrangement D in the form of a loop in a groove, for example of a box-shaped housing part or a housing cover of a housing of the electrical energy store, a holding force is ensured by a frictional connection between side walls delimiting the groove and the legs S of the clamping element 1. The wire netting arrangement D is thus held captive in the groove.The features described herein with respect to a wire mesh assembly and advantages thereof may also relate to an electrical energy storage housing described herein, and vice versa.List of reference characters1 Clamp member 2 Wire mesh 3 Core member A Delivery state D Wire mesh assembly O Opening S Leg

Claims

Wire netting arrangement (D) for shielding electromagnetic radiation of a housing of an electrical energy store, comprising an electrically insulating core element (3) and an electrically conductive wire netting (2) which envelopes the core element (3) along its longitudinal axis, characterised byat least one clamping element (1) for the form-fit and force-fit connection of two ends (E) of the core element (3) enveloped by means of the wire netting (2) to form a loop.Wire netting arrangement (D) according to claim 1, characterised in that the at least one clamping element (1) is arranged in a delivery state (A) so as to be displaceable along the longitudinal axis of the core element (3) sheathed by means of the wire netting (2).Wire netting arrangement (D) according to claim 2, characterised in that the at least one clamping element (1) in its delivery state (A) has a trapezoidal shape in cross-section with an opening (O) formed between two limbs (S).Wire netting arrangement (D) according to one of the preceding claims, characterized in that the at least one clamping element (1) is formed from an electrically conductive material and / or plastically deformable.Wire netting arrangement (D) according to claim 3, characterised in that the respective leg (S) of the at least one clamping element (1) in an assembled state (M) is bent in the direction of the respective other leg (S) and in the direction of the core element (3) when a loop is formed.Wire mesh arrangement (D) according to one of the preceding claims, characterized in that the core element (3) is formed from an elastomer and / or polyurethane foam and / or from silicone.Wire mesh arrangement (D) according to one of the preceding claims, characterized in that the core element (3) is elastically deformable in a predeterminable region.Wire netting arrangement (D) according to one of the preceding claims, characterized in that the core element (3) sheathed by means of the wire netting (2) is designed as a sealing element.Housing for an electrical energy store having a box-shaped housing part and a housing cover, characterized bya wire netting arrangement (D) according to one of Claims 1 to 8, wherein the wire netting arrangement (D) is arranged circumferentially between the housing part and the housing cover.

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