Housing part with an electrical bushing for an electrical device, and energy store with such a housing part

Abstract

In a housing part (10), in particular for an electrical storage device, having an electrical bushing comprising a main body (12) with a passage opening (14) and comprising a connection pin (20) which is arranged in the passage opening (14) and is held in the passage opening (14) by means of a fixing material (16) such that it is electrically insulated, the intention is to reduce the expenditure on manufacture and the risk of misalignment of the components. For this purpose, it is proposed that the main body (12) of the housing part (10) is flat and disc-like with a substantially uniform thickness (D) and a height (H) of the fixing material (16) is greater than the thickness (D) of the main body (12), wherein (i) the main body (12) has a symmetrical bushing, by way of the fixing material (16) and the connection pin (20) being arranged symmetrically with respect to a plane of symmetry (S) situated centrally in the plane of the main body, and / or (ii) the main body (12) has, on its outer edge (17), a symmetrical connecting flange (18b), which is arranged symmetrically with respect to a plane of symmetry (S) situated centrally in the plane of the main body.

Description

[0001] Housing part with electrical feedthrough for an electrical device and energy storage device with such a housing part

[0002] The invention relates to a housing part for an electrical device, in particular for an electrical energy storage device, in particular a battery, preferably a microbattery, or a capacitor, with an electrical feedthrough, comprising a base body with a through-opening and a connecting pin arranged in the through-opening, which is held in the through-opening in an electrically insulating manner by means of a fixing material. A further aspect of the invention relates to an electrical energy storage device comprising such a housing part with at least one feedthrough.

[0003] Electrical energy storage devices – also called electrical storage devices – such as batteries or capacitors, the latter including supercapacitors, are used in a wide variety of applications for storing and providing electrical energy. Electrical energy storage devices typically comprise a housing and at least one storage cell accommodated within the housing. For this purpose, the housing often comprises a cup-shaped housing element. A further component of the housing is a housing part with at least one electrical feedthrough, via which the storage cell can be electrically contacted from the outside. The housing part can form the cover or cover part of an electrical storage device or be a component of a cover or cover part.

[0004] Batteries, within the meaning of the invention, include both disposable batteries, which can be disposed of and / or recycled after discharge, and accumulators. Accumulators, preferably lithium-ion batteries, are intended for various applications such as portable electronic devices, mobile phones, power tools, and, in particular, electric vehicles. These batteries can replace traditional energy sources such as lead-acid batteries, nickel-cadmium batteries, or nickel-metal hydride batteries. The batteries can also be used in sensors or in the Internet of Things.

[0005] Supercapacitors, also called supercapacitors, are commonly known electrochemical energy storage devices with particularly high power density. Unlike ceramic, film, and electrolytic capacitors, supercapacitors do not have a dielectric in the conventional sense. They implement the storage principles of static storage of electrical energy through charge separation in a double-layer capacitor, as well as electrochemical storage of electrical energy through charge exchange using redox reactions in a pseudocapacitor.

[0006] Supercapacitors include, in particular, hybrid capacitors, especially lithium-ion capacitors. Their electrolyte typically comprises a solvent in which conductive salts, usually lithium salts, are dissolved. Supercapacitors are preferably used in applications requiring a high number of charge / discharge cycles. Supercapacitors are particularly advantageous in the automotive sector, especially in the field of braking energy recuperation. Other applications are, of course, also possible and encompassed by the invention.

[0007] The basic principle of an electrical feedthrough in an electrical device is that a terminal pin is held in an electrically insulating manner by a fixing material in a through-hole formed in a base body. The term "terminal pin" is generally used here to refer to a functional element, which could be, for example, an electrical conductor.

[0008] In the case of electrical storage devices, a stable, sealed leadthrough of the connection pin is particularly necessary over a long period of time and, for example, in the event of an accident, to prevent the escape of battery electrolyte from the interior of the electrical storage device. Therefore, the base body containing the leadthrough has a very thick material in order to achieve tightness and stability over a large contact length between the wall of the through-opening of the base body and the fixing material. This results in large, relatively heavy storage devices with large dimensions, for example, heights. However, housing parts with a very thick material lead to a small volume inside the housing, for example, of a storage device.

[0009] DE 10 2014 016 601 A1 discloses a housing component, in particular a battery housing or capacitor housing, with a feedthrough, wherein a pin-shaped conductor in a glass or glass-ceramic material is guided through a through-opening. The housing component has a reinforcement in the area of ​​the through-opening, while the rest of the housing component is designed to be thinner. This allows weight to be saved while still providing a stable, sealed feedthrough.

[0010] In electrical devices, especially electrical storage devices, the trend is toward increasingly smaller and more compact versions with thin housing materials. Small, compact electrical storage devices are also referred to as microbatteries. However, ensuring a tight, stable feedthrough for the connection pin is problematic when the housing material is thin.

[0011] WO2020 / 104571 A1 shows an electrical storage device as a microbattery with a feedthrough, wherein the feedthrough is embedded in a battery cover part with a formed collar. Furthermore, a flexible flange is disclosed in the area of ​​the feedthrough. A formed collar and a flexible flange represent two possibilities for providing a greater contact length for the fixing material in a thin housing part or base body, despite a low material thickness in the area of ​​the through-opening. WO2021 / 185648 A1 discloses a microbattery characterized by a particularly compact design. The metal fixing material feedthrough provided in the base body for an electrical connection of the microbattery can be designed as a pressure-sealed glazing, thus ensuring a particularly reliable seal for the feedthrough.In the microbattery shown in WO2021 / 185648 A1, a reinforcement, a formed collar or a formed base body with a flexible flange are also used in the area of ​​the feedthrough to stabilize the housing part and to provide reliable electrical insulation of the connection pin inserted into the through-opening by forming a longer contact length for the fixing material in the through-opening of the base body.

[0012] Due to areas of the base body protruding from a housing part plane - such as reinforcement, collar or flexible flange - the geometric design of the top side of the housing part differs from the geometric design of the bottom side of the housing part, i.e. the housing part is asymmetrical with regard to the feedthrough - comprising the through-opening in the base body, the fixing material, the connection pin - in relation to a plane of symmetry lying in the housing part plane. With the help of areas protruding from the housing part plane, in particular parts of the base body, it is possible to distinguish between the top and bottom side of the base body or housing part. This enables the individual parts of the housing part to be reliably aligned for the production of the electrical feedthrough and / or for the production of a cover or housing.However, such housing parts require space due to the protruding areas, which must be structurally accommodated inside the housing or outside the electrical device.

[0013] To gain space inside the housing or reduce the height of electrical devices, there is an increasing demand for housing components that provide a tight feedthrough for a terminal pin even without reinforcing elements such as reinforcements, collars, or flexible flanges. For example, WO 2021 / 185649 A1 teaches encapsulating a conductor over a glass or glass-ceramic material in the through-hole of a thicker base body to create a tight connection between the terminal pin, the fixing material, and the base body. The resulting entire feedthrough is then reduced in thickness by machining it on one or both sides.

[0014] The disadvantage of the known housing parts with metal fixing material feedthroughs with pressure glazing or adapted feedthrough is their high manufacturing cost and the risk of errors in the orientation of the components, especially with very small or thin housing parts.

[0015] It is therefore an object of the invention to provide an improved housing part having an electrical feedthrough which overcomes these disadvantages.

[0016] Disclosure of the invention

[0017] This object is achieved by a housing part having the features of claim 1. Within the scope of the invention, a housing part with improved symmetry is provided, which reduces the manufacturing effort for the housing part, as less effort is required to correctly align the components. Furthermore, the risk of components being incorrectly arranged in the finished housing part is reduced.

[0018] According to a first embodiment of the invention, the improved symmetry of the housing part is due to a symmetrical feedthrough. In a second embodiment of the invention, the improved symmetry of the housing part is achieved by a symmetrical connecting flange on the outer edge of the base body. It is particularly advantageous in one embodiment if the housing part combines both variants, i.e., has both a symmetrical feedthrough and a symmetrical connecting flange.

[0019] Overall, a housing part is proposed, in particular for an electrical storage device, with an electrical feedthrough. The housing part comprises a base body with a through-opening and a connecting pin arranged in the through-opening, which is held in the through-opening in an electrically insulating manner by a fixing material, thus forming an electrical feedthrough.

[0020] According to the invention, a disc-shaped base body with a substantially uniform thickness is used as the base body. Substantially uniform thickness means that the base body has the same thickness outside the area of ​​the through-opening as in an area adjacent to the through-opening. The base body is thus flat and has no reinforcement, collar, flexible flange, or similar reinforcing means. When considering the thickness, the edge located on the outer circumference of the base body is not taken into account. With such a housing part, thin, compact housings with a large interior volume can be provided. Furthermore, complex forming work on the base body is eliminated.

[0021] In the first embodiment according to the invention, the base body has a symmetrical feedthrough. The fixing material and the connecting pin are arranged symmetrically to a plane of symmetry located centrally in the base body plane, so that the housing part is symmetrical with respect to the feedthrough. In terms of geometry, there are therefore no differences between the top and bottom of the housing part. This means that one end face or surface of the connecting pin is at the same distance from the plane of symmetry on the bottom of the housing part as the other end face or surface of the connecting pin is at the same distance from the plane of symmetry on the top of the housing part.

[0022] The same applies to the fixing material. Such a symmetrical housing component can be manufactured with less effort, as measures for determining the orientation of the individual parts are eliminated. The distance between the end faces of the connecting pin is the thickness of the connecting pin.

[0023] It is also provided that the height of the fixing material is greater than the thickness of the base body in the region of the through-opening. The end faces of the fixing material are thus each arranged so as to protrude beyond a surface of the base body. Advantageously, the fixing material has a substantially uniform height, i.e. a substantially constant height, starting from the connecting pin. In other words, the opposite end faces of the fixing material - starting from the connecting pin - are advantageously arranged substantially parallel to one another. A contact area between the base body and the fixing material can be excluded from this (see below). This design and arrangement of the fixing material provides a particularly compact, space-saving feedthrough, in contrast to a feedthrough with an arc-shaped, curved profile of the fixing material surface with increasing height of the fixing material towards the connecting pin.Such dimensioning of the fixing material also offers manufacturing advantages, as it ensures that sufficient fixing material is available for secure and tight fixing, especially glazing, of the connecting pin. In other words, the fact that the end faces of the fixing material are each arranged so that they protrude beyond a surface of the base body creates a reservoir for the fixing material, which can be used to compensate for, for example, volume fluctuations in the fixing material and fluctuations in the dimensions of the components. Furthermore, this improves the insulation between the connecting pin and the base body, thus preventing a short circuit with the base body when contacting the connecting pin.

[0024] Towards the contact area between the fixing material and the base body, both end faces of the fixing material converge towards the base body. In other words, the height of the fixing material increases from the base body towards the connecting pin until a substantially uniform height is reached or the end faces of the fixing material run parallel to each other. The contact area can coincide with the wall of the through-hole, but does not have to (see the description below for "fixing material overflow"). 1 ).

[0025] In the context of the disclosure, terms such as “uniform thickness”, “uniform height”, “constant height”, “parallel end faces”, etc. are of course to be understood within the scope of the usual manufacturing tolerances.

[0026] It may be advantageous if the difference, i.e., the difference between the height of the fixing material and the thickness of the base body, is a maximum of 30%, preferably a maximum of 28%. A favorable lower limit for the difference may be 6% or 8%, i.e., the height of the fixing material is 6 to 30% greater than the thickness of the base body. With a symmetrical implementation, the difference is distributed symmetrically across both sides of the housing part, so that it amounts to a maximum of 15% or a maximum of 14% and / or at least 3% or 4% per side.

[0027] The term "symmetrical feedthrough" is, of course, to be understood within the limits of standard manufacturing tolerances. Within the scope of the disclosure, it is considered symmetrical in particular if a plane of symmetry located centrally in the base body plane deviates, preferably by less than 4% of the thickness of the connecting pin, from a plane of symmetry located centrally in the connecting pin plane. In particular, the distance between the planes of symmetry is less than 4% of the thickness of the connecting pin. Advantageously, the deviation can be even smaller, in particular less than 3%, preferably less than 2%.

[0028] In the second embodiment according to the invention, the housing part comprises a symmetrical base body. For this purpose, the disc-shaped base body with a substantially uniform thickness has a symmetrical connecting flange on its outer edge. The symmetrical connecting flange is arranged symmetrically to a plane of symmetry lying centrally in the plane of the base body. The term "symmetrical connecting flange" is of course to be understood within the limits of the usual manufacturing tolerances. A symmetrical connecting flange is preferably formed in that the base body has a matching step and / or chamfer or bevel on the edge, both on its upper side and on its lower side, i.e. there is a step and / or chamfer on both sides.Because the base body has a symmetrical connecting flange, which can also be designed without steps or chamfers, no distinction needs to be made between the top and bottom of the base body during production of the housing part. Even if the finished housing part is later to have an asymmetrical feedthrough, in which the end face of the connecting pin and / or the fixing material on the bottom of the housing part is at a different distance from the plane of symmetry of the base body than that on the top of the housing part, the correct orientation of the base body relative to the later top or bottom is irrelevant during production of the housing part. This reduces the manufacturing effort.The symmetrical connecting flange can be used to connect to another housing component—for example, a cup-shaped housing element or another cover element of the cover—for example, using a welded or soldered connection. The connection is preferably designed to be largely gas-tight and preferably has a He leakage rate of less than 10'. 8 mbar l / sec at a pressure difference of 1 bar. Furthermore, the symmetrical connecting flange can have a centring function.

[0029] In order to improve the insulation between the connection pin and the base body and to provide sufficient fixing material, it can be advantageous, even with a base body with a symmetrical connecting flange, if the height of the fixing material is greater than the thickness of the base body in the region of the through-opening. At least one plane or end face of the fixing material can be arranged so as to protrude beyond a surface of the base body. The fixing material advantageously has a substantially uniform height, i.e. a substantially constant height, starting from the connection pin. In other words, the opposite end faces of the fixing material - starting from the connection pin - are advantageously arranged substantially parallel to one another. A contact area between the base body and the fixing material can be an exception to this (see below).This design and arrangement of the fixing material provides a particularly compact, space-saving feedthrough, in contrast to a feedthrough with an arc-shaped, curved surface as the height of the fixing material increases towards the connecting pin. This type of dimensioning of the fixing material also offers manufacturing advantages, as it ensures that there is sufficient fixing material for secure and tight fixing, in particular glazing, of the connecting pin. In other words, the fact that at least one end face of the fixing material is arranged so as to protrude beyond a surface of the base body provides a reservoir for the fixing material, which can be used to compensate for, for example, volume fluctuations in the fixing material and fluctuations in the dimensions of the components.In addition, this improves the insulation between the connection pin and the base body, so that a short circuit with the base body can be avoided when contacting the connection pin.

[0030] Towards the contact area between the fixing material and the base body, at least one end face of the fixing material converges towards the base body. In other words, the height of the fixing material increases from the base body toward the connecting pin until a substantially uniform height is reached or the end faces of the fixing material run parallel to one another. The contact area may coincide with the wall of the through-hole, but this does not have to be the case (see below). Within the scope of the disclosure, terms such as "uniform thickness", "uniform height", "constant height", "parallel end faces", "matching step and / or chamfer or bevel", etc. are, of course, to be understood within the scope of usual manufacturing tolerances.

[0031] Here too, it can be advantageous if the difference, i.e. the difference, between the height of the fixing material and the thickness of the base body is a maximum of 30%, preferably a maximum of 28%. An advantageous lower limit for the difference can be 6% or 8%, i.e. the height of the fixing material is 6 to 30% greater than the thickness of the base body. The difference can be distributed symmetrically across both sides of the housing part, so that it amounts to a maximum of 15% or a maximum of 14% and / or at least 3% or 4% per side. In the case of a base body with a symmetrical connecting flange, the difference can, however, also be distributed asymmetrically across the sides of the housing part. A flush arrangement of the fixing material and base body on one side is also possible.

[0032] A particularly advantageous embodiment of the housing part is one in which the base body has both a symmetrical feedthrough and a symmetrical connecting flange. Such housing parts can be manufactured with reduced effort. Furthermore, the effort required to assemble a housing comprising the advantageous symmetrical housing part is simplified, since the top and bottom of the housing part have a matching geometry.

[0033] Within the scope of the disclosure, the fixing material advantageously has a shaped surface in the region in which its end faces run essentially parallel or the fixing material has an essentially uniform height. A shaped surface is formed in particular in contact with melt molds and preferably has a surface roughness Ra (arithmetic mean roughness) of > 1 pm. In the transition to the base body, i.e. in the contact region in which at least one surface of the fixing material converges towards the base body, the fixing material can have a freely formed surface, preferably with a curvature. A freely formed surface forms without contact with a mold. The freely formed, preferably curved section can have a fire-polished surface, preferably with a surface roughness Ra of < 0.2 pm, more preferably < 0.1 pm. The surface roughness Ra was determined here tactilely with the aid of a profilometer.Ra is preferably determined according to DIN EN ISO 4287.

[0034] When viewed in vertical cross-section, the housing part has a gap on both sides between the base body and the terminal pin located in its through-hole. This gap is filled with fixing material. The gap is thus the distance between the wall of the through-hole and the wall of the terminal pin.

[0035] In the first embodiment of the invention, the second embodiment of the invention, or a combination of both embodiments of the invention, it is advantageous if, in the housing part, an imaginary tangent applied to the surface of the fixing material at the contact point with the connecting pin forms a contact angle of approximately 90° with the connecting pin. In other words, this is a right angle (naturally within the limits of the usual manufacturing tolerances), here preferably an angle of 90° with a deviation of + / - 2°. This is described in more detail below. This provides a hermetic connection and, at the same time, a compact feedthrough.

[0036] In the first embodiment according to the invention, the second embodiment according to the invention or a combination of both embodiments according to the invention, it can be advantageous if the desired essentially uniform height of the fixing material is present at the latest after 25%, preferably at the latest after 20%, preferably at the latest after 15% of the distance between the base body and the connection pin, wherein the reference point, i.e. the starting point for observation, is the base body. A plateau thus quickly forms in which the fixing material has an essentially constant height and the end faces of the fixing material run essentially parallel to one another. A plateau with an essentially constant height of the fixing material can advantageously extend over at least 75%, advantageously at least 80%, preferably at least 85% of the distance between the base body and the connection pin. This provides a long insulation distance.

[0037] In the first embodiment according to the invention, the second embodiment according to the invention or a combination of both embodiments according to the invention, it can be advantageous if the fixing material not only projects beyond one or both surfaces of the base body, but also covers the edge of the through-opening, i.e. the fixing material can cover a region of the upper side of the base body adjacent to the through-opening. Such a constellation is referred to in the disclosure as “fixing material overflow” or “fixing material coverage”. A fixing material overflow can be formed on one side of the base body or on the other side of the base body or on both sides of the base body, depending on whether a symmetrical or an asymmetrical feedthrough is present.In a design with a fixation material overflow, the contact area between the fixation material and the base body is not only in the area of ​​the wall of the through-hole, but also extends beyond the edge of the through-hole onto a surface of the base body, on at least one side of the base body. Here, too, at least one end face of the fixation material converges toward the base body. In other words, the height of the fixation material increases from the base body, not only from the through-hole, but also from a surface of the base body, so that one edge of the through-hole is covered.

[0038] A fixing material overflow creates an even larger reservoir for the fixing material, and the insulation effect is enhanced. In addition, the feedthrough can be mechanically more stable and the hermetic seal more reliable. With this variant, too, it can be advantageous if, with regard to the desired essentially uniform height of the fixing material, starting from the first contact of the fixing material with the base body surface, a plateau quickly forms, in which the end faces of the fixing material run essentially parallel to one another and the fixing material has an essentially constant height. The desired essentially uniform height of the fixing material is advantageously achieved after 10% at the latest, preferably after 5% at the latest, of the distance between the base body and the connection pin.A plateau with a substantially constant height can advantageously extend over at least 90%, advantageously at least 100% of the distance between the base body and the connecting pin.

[0039] In the embodiments of the invention, the connecting pin can have two end faces and a lateral surface. For example, it can have a circular cylindrical shape, with the lateral surfaces of the cylinder facing the fixing material. In addition to the circular cylindrical shape, general cylindrical shapes with other end face shapes are also conceivable. For example, oval shapes or rectangles with rounded corners are conceivable. In the embodiment with a symmetrical feedthrough, the connecting pin is also symmetrically constructed. In the embodiment with a symmetrical connecting flange, it can be symmetrically or asymmetrically constructed.

[0040] Within the scope of the embodiments of the invention, the disk-shaped base body, the fixing material, and the connecting pin form a metal-fixing material feedthrough, through which the through-opening of the base body is closed. The resulting feedthrough is preferably hermetically sealed. Hermetically sealed means a He leakage rate of 1 ■ 10 -8mbar l / s at a pressure difference of 1 bar. The housing part according to the invention can in particular be a housing part for forming a housing for an electrical storage device. For example, the housing part can be designed as a cover part or lid which can be joined together with a cup-shaped housing element to form a housing for an electrical storage device. However, the housing part can also be a component of a lid or lid part in that the housing part is inserted into an opening which is formed in a lid element. The electrical storage device can in particular be a battery or a capacitor, including a supercapacitor, wherein the housing usually accommodates at least one storage cell which can be electrically contacted from the outside via the electrical feedthrough as a connection terminal.The housing part can also comprise a feedthrough which is designed as a multi-pole feedthrough, in which the base body has a plurality of through-openings and in each of the through-openings a connecting pin is held by a fixing material.

[0041] In an advantageous embodiment, the base body has a thickness in the range of 0.1 mm to 1 mm, preferably 0.15 mm to 0.8 mm, in particular 0.15 mm to 0.6 mm. This allows a housing part for a particularly compact, small electrical device—in particular an electrical storage device or sensor housing, preferably a battery, in particular a microbattery, or a capacitor—to be provided with a feedthrough.

[0042] In a housing part with a symmetrical feedthrough, it can be advantageous if the base body or the housing part has a connecting flange, in particular an asymmetrical connecting flange, on the outer edge. The connecting flange can serve to align and center the housing part or base body with respect to another housing component, for example, a cup-shaped housing element or a cover element, during the assembly of a housing or cover. For this purpose, a corresponding counterflange can advantageously be formed on the other housing component. In addition, the connection to the other housing component can be made at the connecting flange, for example, by means of a welded or soldered connection. The connection is preferably designed such that it is largely gas-tight and preferably has a He leakage rate of less than 10' 8 mbar l / sec at 1 bar pressure difference.

[0043] In an advantageous further development of the design with a symmetrical feedthrough, the connecting flange can be formed as a one-sided step or one-sided chamfer, with the thickness of the base body decreasing towards the edge. This results in an asymmetrical connecting flange. The step or bevel of the connecting flange can be formed on the first side of the base body, with the first side being the side that faces inward when a housing is formed. Alternatively, the step or bevel could also be formed on the second side of the base body, with the second side being the side that faces outward when a housing is formed.

[0044] Due to the low material thickness of the base bodies of housing parts, especially for small electrical devices, such as micro batteries, and the fact that the connecting flange has an even lower thickness, a small one-sided step or bevel on the connecting flange is generally difficult to identify and thus the orientation of the base body can often only be determined with great equipment effort.

[0045] However, because the fixing material and the connecting pin are arranged symmetrically to a plane of symmetry centrally located in the plane of the base body within the scope of the invention, it is irrelevant for the production of the housing part from individual parts which direction the connecting flange faces, i.e., on which side of the base body the one-sided step or the one-sided bevel is formed. By aligning the base body, the fixing material, and the connecting pin to the plane of symmetry, the prior orientation of the base body with respect to the step or bevel can be eliminated during the production of the housing part. This saves costs and prevents product defects.

[0046] In an advantageous refinement of the design with a symmetrical feedthrough or the design with a symmetrical connecting flange, or a design that includes both, the end faces of the connecting pin are each arranged flush with a surface or end face of the fixing material. The surfaces of the connecting pin are thus flush with the surface of the fixing material on both sides of the housing part. Due to the flat shape of the electrical feedthrough, the feedthrough and thus the housing part can have a low overall height.

[0047] In an advantageous refinement of the design with a symmetrical feedthrough or the design with a symmetrical connecting flange, or a design that includes both, both end faces of the connecting pin are arranged so as to protrude beyond a surface or end face of the fixing material, particularly in the case of a symmetrical feedthrough, at the same distance from the plane of symmetry of the base body. The end faces or surfaces of the connecting pin are thus located on both sides of the housing part above the plane of the respective end face or surface of the fixing material. This creates a raised contact surface, which allows for easy electrical contacting of the connecting pin, for example, by welding contact lugs.

[0048] When designing with a symmetrical base body through a symmetrical connecting flange, it can be advantageous if the connecting pin is designed asymmetrically, i.e., has an asymmetrical geometry and / or an asymmetrical structure. Alternatively or additionally, the connecting pin and / or the fixing material can advantageously be arranged asymmetrically in the feedthrough by having their end faces spaced at different distances from the plane of symmetry of the base body. Measures for orienting an asymmetrical connecting pin or an asymmetrically arranged connecting pin can be omitted.

[0049] In a design with a symmetrical base body through a symmetrical connecting flange, it can be advantageous if one or both end faces of the connecting pin are arranged flush with a surface of the base body. Since the base body is symmetrical, the manufacturing effort for the housing part is reduced even if only one end face of the connecting pin is arranged flush with a surface of the base body or if the end faces of the connecting pin are spaced differently from the plane of symmetry of the base body, i.e., an asymmetrical feedthrough is present.

[0050] In a design with a symmetrical base body through a symmetrical connecting flange, it can be advantageous if one or both end faces of the connecting pin are arranged so as to protrude beyond a surface of the base body. Since the base body is symmetrical, the manufacturing effort for the housing part is reduced even if only one end face of the connecting pin is arranged so as to protrude beyond a surface of the base body or if the end faces of the connecting pin are spaced differently from the plane of symmetry of the base body, i.e., an asymmetrical feedthrough is present.

[0051] The material of the base body and / or the material of the connecting pin are preferably selected from steel, in particular ferritic, austenitic, or duplex steel, stainless steel, stainless steel, iron-nickel alloys, iron-nickel-cobalt alloys, KOVAR, molybdenum, titanium, titanium alloy, aluminum, or aluminum alloy. The connecting pin can consist of or comprise one of the mentioned materials. A preferred example has a base body made of austenitic steel and a connecting pin that comprises or consists of ferritic steel.

[0052] Preferably, the fixing material is a glass, a glass ceramic or a ceramic or comprises a glass, a glass ceramic or a ceramic.

[0053] Preferred glasses include technical glasses, particularly oxide glasses, which are preferably chemically resistant to common materials associated with electrical energy storage devices. In the case of a technical glass, the fixing material is, for example, an aluminum borate glass comprising Al2O3 and B2O3, or a bismuth glass comprising, for example, Bi2O3 as the glass former. Alternatively, glasses comprising lead oxide as the glass former, particularly glasses from the PbO-B2O3 system, or vanadium-containing glasses can also be used as the fixing material.

[0054] For glass-to-metal bushings, suitable glasses are selected as fixing materials according to their properties such as melting temperature and / or expansion coefficient.

[0055] Preferably, the melting point of the fixing material is selected to be lower than the melting point of the material of the connecting pin or all materials of the connecting pin. This ensures that the connecting pin is not damaged during the production of the metal fixing material feedthrough using a heat treatment step, for example, for sintering or vitrifying the fixing material.

[0056] In such a heat treatment step, the fixing material can be obtained from a compact, i.e., a fixing material precursor, comprising, for example, a glass powder, a glass-ceramic powder, or a ceramic powder. The glass powder can consist of or comprise a partially crystallizable glass, so that during heat treatment, the partially crystallizable glass is ceramized, resulting in a glass-ceramic.

[0057] Glasses with a low melting temperature can be advantageous. In a variant described below, a glass whose melting temperature is below the melting point of aluminum or an aluminum alloy is particularly advantageous. It may be preferred if, in an electrical feedthrough for an electrical storage device, for example a battery, a capacitor, or a supercapacitor, the fixing material comprises or consists of a bismuth-based glass that includes Bi2O3 as the glass former, or a lead-based glass that includes PbO as the glass former.

[0058] For example, an aluminum borate glass with the main components Al2O3, B2O3, BaO, and SiO2 is used as a glass or glass-ceramic material. The expansion coefficient of such a glass material is preferably in the range of 9.0 to 9.5 ppm / K or 9.0 to 9.5 10' 6 / K. If, for example, a bismuth glass is used, the expansion coefficient is approximately 10.5- 10 -6 / K.

[0059] However, depending on the thermal expansion behavior of the materials of the base body and connecting pin, other glasses with a different thermal expansion coefficient can also be used advantageously.

[0060] To achieve a particularly good seal between the metal parts, i.e., the base body and the terminal pin, and the fixing material, the electrical feedthrough can be designed in the form of a pressure glazing. The thermal expansion coefficient of the base body is selected to be greater than the thermal expansion coefficient of the fixing material, so that after a temperature treatment, during which the fixing material is glazed into the through-hole, the base body contracts more strongly than the fixing material. This permanently exerts compressive forces through the base body on the fixing material. These pre-tension the fixing material and ensure a particularly durable seal.

[0061] Accordingly, it is preferred that the thermal expansion coefficient of the base body be greater than the thermal expansion coefficient of the fixing material. Particularly preferably, in the case of pressure glazing, the thermal expansion coefficient of the base body is selected to be at least 5%, preferably at least 10%, particularly preferably at least 20%, and most preferably at least 50% greater than the thermal expansion coefficient of the fixing material.

[0062] The prestress for the pressure glazing is essentially determined by the difference in the expansion coefficients between the material of the base body and the fixing material.

[0063] In an advantageous embodiment, the expansion coefficient of the base body is in the range 12-10' 6 1 / K to 19-10' 6 1 / K and the expansion coefficient of the fixing material in the range 9 10' 6 1 / K to 11 -10' 6 1 / K.

[0064] The thermal expansion coefficient of the glass, ceramic, or glass-ceramic material can be modified as needed by mixing the glass, ceramic, or glass-ceramic material with a filler. The thermal expansion coefficient can then be adjusted by selecting the type and amount of filler.

[0065] In an advantageous embodiment, the expansion coefficient of the connecting pin is in the range 6 10' 6 1 / K to 11 ■ 10' 6 1 / K. Accordingly, the expansion coefficient of the connecting pin or a core of the connecting pin, when the feedthrough is designed as a pressure glazing, is preferably adapted to the expansion coefficient of the fixing material or is selected to be slightly smaller. For pressure glazing, for example, an austenitic steel with an expansion coefficient of approximately 16 -10' can be used. 6 1 / K with a bismuth-based glass with an expansion coefficient of approximately 10.5 -10' 61 / K and a core made of ferritic steel with an expansion coefficient of approx. 10 ' 6 1 / K can be combined.

[0066] As an alternative to pressure glazing, the expansion coefficient of the base body and the expansion coefficient of the fixing material can be matched. It is preferred if the difference between the expansion coefficients is less than 5%.

[0067] In particular, an adapted implementation is understood to mean that the expansion coefficients essentially change by a maximum of 1 * 10 ' 6 1 / K, in particular are essentially the same. The expansion coefficient of the connecting pin is preferably adapted in the same way to the expansion coefficient of the fixing material.

[0068] Where values ​​for the coefficient of expansion were mentioned above in connection with pressure glazing or adapted glazing for materials, these refer to the linear thermal expansion coefficient a usually specified in connection with glass-metal penetrations in the temperature interval 20-300°C.

[0069] In an advantageous embodiment, the terminal pin comprises a core made of a first electrically conductive material, and at least on a first side of the electrical feedthrough, a first end face of the core is covered with a covering material made of a second electrically conductive material. Advantageously, the terminal pin and the fixing material are designed and arranged such that the first electrically conductive material of the core is inaccessible on the first side of the electrical feedthrough. For this purpose, the fixing material directly adjoins the covering material.

[0070] It is advantageous if the first side of the electrical feedthrough, on which the first electrically conductive material of the core is advantageously inaccessible, is the side that faces inward when a housing is formed. The first end face of the core with covering material thus faces inward when a housing is formed. An alternative arrangement, in which the first electrically conductive material of the core is inaccessible from the side facing outward when a housing is formed, is of course also possible and equally advantageous.

[0071] If the housing part has an asymmetrical connecting flange, it is advantageous if the electrical feedthrough is symmetrical in that both end faces of the core are covered with the covering material made of the second electrically conductive material.

[0072] The proposed terminal pin comprises at least two different materials, wherein the first electrically conductive material of the core is preferably selected according to the requirements of the metal fixing material feedthrough.

[0073] For this purpose, the first electrically conductive material can be selected, in particular, with regard to its thermal expansion coefficient and resistance to deformation. The second electrically conductive material is preferably selected according to the requirements of the electrical storage device. In particular, the second electrically conductive material can be selected with regard to chemical resistance to materials of the storage cell and electrochemical potentials.

[0074] The connecting pin can, for example, have a circular cylindrical shape, with the cylindrical outer surfaces facing the fixing material and at least one of the core's end faces covered with the covering material. In addition to the circular cylindrical shape, general cylindrical shapes with other end face shapes are also conceivable. For example, oval shapes or rectangles with rounded corners are conceivable.

[0075] In addition to covering a first end face of the core with the covering material, it can also be provided to cover a second end face of the core opposite the first end face with a further covering material made of a third electrically conductive material. The third electrically conductive material can be selected to be identical to or different from the second electrically conductive material. If a different material is selected, the second electrically conductive material in particular can be adapted to the requirements of the materials of a memory cell, and the third electrically conductive material can be optimized, for example, for simple, secure connection to electrical terminals. Welding properties or soldering properties, for example, can be used as a criterion for material selection.

[0076] In an advantageous variant, a lateral surface of the core facing the fixing material is at least partially uncovered with covering material and directly borders the fixing material. Preferably, the lateral surface of the core is completely free of the covering material. In another advantageous variant, the surface of the core is completely covered with covering material, so that, in particular, the lateral surface is also completely covered with covering material.

[0077] Preferably, the melting point of the fixing material is selected to be lower than the melting point of all materials of the terminal pin. This ensures that the terminal pin is not damaged during production of the metal fixing material feedthrough using a temperature treatment step, for example, for sintering or vitrifying the fixing material. Preferably, the second electrically conductive material and / or the third electrically conductive material is applied to the end face of the core by plating, electroplating, coating, vapor deposition, welding, or soldering. If only comparatively small thicknesses of the covering material are applied, electroplating, coating, and vapor deposition are preferred. Conversely, plating, welding, and soldering are preferred if comparatively large thicknesses of the covering material are applied.

[0078] During cladding, the starting materials, such as the cover material and the core material, are typically provided in the form of plates or strips, superimposed, and then bonded together by rolling. During soldering or welding, the cover material, for example, can be placed on top of the core material in the form of a sheet or foil and welded or soldered to it.

[0079] Examples of possible vapor deposition processes include physical vapor deposition (PVD) such as sputtering, chemical vapor deposition (CVD) or plasma-enhanced chemical vapor deposition (PECVD).

[0080] Regardless of the application method, the covering material is preferably arranged free of openings or defects, so that the corresponding end face of the core is completely covered. In particular, this is intended to prevent the first conductive material from coming into contact with materials from the interior of an energy storage device.

[0081] Furthermore, the covering material is preferably selected and arranged such that it is suitable for soldering or welding electrical contacts, such as contact tabs. Accordingly, the covering material is preferably designed such that it is suitable for soldering or welding electrical contacts, while preventing any cracks or openings from forming in the covering material.

[0082] Preferably, the metallic materials that can come into contact with an electrolyte and / or the fixing material are selected such that they are resistant to electrolytes, in particular aqueous and / or non-aqueous electrolytes. In particular, it is preferred if the materials of the feedthrough exhibit high chemical resistance to non-aqueous battery electrolytes, in particular to carbonates, preferably carbonate mixtures with a conductive salt, preferably comprising LiPFe.

[0083] The first electrically conductive material of the core of the terminal pin is preferably selected from steel, in particular ferritic, austenitic or duplex steel, stainless steel, stainless steel, iron-nickel alloys, iron-nickel-cobalt alloys, KOVAR, molybdenum, titanium, titanium alloy, aluminum or aluminum alloy.

[0084] The second electrically conductive material and / or the third electrically conductive material of the terminal pin is preferably selected from aluminum, an aluminum alloy, AlSiC, copper, a copper alloy, molybdenum, nickel or nickel alloys, palladium, silver or gold.

[0085] A preferred example of a terminal pin comprises a core made of a stainless steel, in particular a ferritic stainless steel, and a cover material made of aluminum or an aluminum alloy.

[0086] However, other material combinations in which the melting point of the second electrically conductive material and / or the third electrically conductive material is lower than the melting point of the first electrically conductive material of the core of the terminal pin are also preferred. Typically, a safety valve and / or a predetermined breaking point is provided as a safety element on housings for energy storage devices in order to relieve excess pressure in the event of excess pressure inside in a controlled manner. The housing part preferably has such a safety element. For this purpose, it is preferred to select an extrusion force for the terminal pin held by the fixing material such that the terminal pin is pressed out when a predetermined extrusion force is exceeded. Such an adjustment of the extrusion force is known, for example, from DE 202020106 518 U1.

[0087] Preferably, the fixing material and its connection to the wall of the through-opening and the connecting pin are designed in such a way that a safety valve function is provided above a predetermined extrusion force, wherein the predetermined extrusion force is set by one or more of the following measures: a. selecting the thickness of the glazing, b. selecting the fixing material, c. selecting the bubble content in the fixing material, d. structuring the surface of the fixing material by adjusting the shape of a fixing material preform before glazing, e. structuring the surface of the fixing material during glazing, f. laser processing the surface of the fixing material after glazing, g. introducing notches or tapers into the fixing material on one or both sides and / or h. introducing notches or tapers into the connecting pin and / or the base body.

[0088] The housing part can advantageously be used in an electrical device, in particular an electrical storage device, preferably a microbattery, or e.g. in a sensor housing. A housing part according to the invention with an electrical feedthrough is produced within the scope of the invention by providing a disk-shaped base body with a substantially uniform thickness and a through-opening, a fixing material precursor, and a connecting pin. At least the base body, and preferably also the fixing material and connecting pin, are provided in a random orientation. The fixing material or a precursor material can be provided in the form of a shaped body. The volume of the fixing material precursor is advantageously dimensioned such that in the produced housing part, the fixing material protrudes beyond a surface of the base body on at least one side. The shaped body can, for example, have the shape of a hollow cylinder.To form the electrical feedthrough, the terminal pin is positioned in the preformed fixing material body in the through-hole of the base body. Using suitable melt molds, the base body, the preformed fixing material body (preferably in the form of a hollow cylinder), and the terminal pin are positioned according to the desired symmetry of the housing part. In the case of a symmetrical feedthrough, the base body, the preformed fixing material body, and the terminal pin are positioned symmetrically to a plane of symmetry centrally located in the base body plane, regardless of the direction of any asymmetrical connecting flange of the base body.If the base body has a symmetrical connecting flange, the base body, fixing material, and connecting pin can also be positioned using appropriate melt molds in such a way that - if desired - an asymmetrical feedthrough is created in which the end faces of the fixing material and / or connecting pin on the first side of the housing part are at a different distance from the plane of symmetry located centrally in the base body plane than on the second side of the housing part, and / or in which the connecting pin is designed asymmetrically. The melt molds are designed and arranged, and the volume of the fixing material molded body is selected, such that in the region of the through-opening in the finished component, the height of the fixing material is greater than the thickness of the base body, and preferably the end faces of the fixing material run essentially parallel, starting from the connecting pin.The connecting pin is then glazed into the opening through a temperature treatment (heating), whereby the fixing material forms an intimate bond with the material of the connecting pin and the material of the base body. With the exception of the contact area between the base body and the fixing material, the surface of the fixing material advantageously forms in contact with the melt molds. This results in a shaped surface with a typical roughness, which was described above in connection with the housing part. In the transition to the base body, i.e. in the contact area, the surface of the fixing material can be freely formed and - in an advantageous variant - even extend over the edge of the through-opening. To avoid repetition, reference is made to the above explanations.

[0089] A further aspect of the invention is the provision of an electrical storage device. The proposed electrical storage device is designed, in particular, as a battery or as a capacitor, including a supercapacitor, and comprises a housing with a housing part described herein with at least one electrical feedthrough. Furthermore, the electrical storage device preferably comprises at least one storage cell, in particular a battery cell or a capacitor cell, which is arranged, for example, in a cup-shaped housing element.

[0090] The storage device according to the invention is designed to be compact, so that as much active volume as possible is made available inside the housing, whereby the battery and / or the capacitor can have the highest possible capacity.

[0091] The base body of the electrical feedthrough is a component of a housing part, which is particularly designed as a cover or is a component of a cover that is preferably hermetically sealed to other housing parts, so that a hermetically sealed housing for the electrical storage device is formed. For example, to form the housing, a cover is connected to the electrical feedthrough by welding to a cup-shaped housing element. Hermetically sealed means that the housing has a He leakage rate of less than 10'. 8 mbar l / sec at 1 bar pressure difference.

[0092] In an advantageous variant of an electrical storage device, the material thickness of the base body is in the range 0.1 mm to 1 mm, preferably 0.15 mm to 0.8 mm, in particular 0.15 mm to 0.6 mm.

[0093] Particularly compact electrical storage devices are provided if the electrical storage device has a total height of at most 40 mm, preferably at most 30 mm or at most 20 mm or at most 10 mm and / or the total height is advantageously in the range of 1 mm to 40 mm.

[0094] The diameter, especially of a micro battery, can be 3 mm to 30 mm or 4 mm to 20 mm or 6 mm to 16 mm.

[0095] In an advantageous embodiment, the electrical storage device is a microbattery. Fundamentally, a distinction is made between different types of microbatteries, e.g., pin-shaped microbatteries, in which a small diameter of a few mm is compensated for by a relatively large overall height (up to approximately 40 mm), and button-shaped microbatteries, which have a relatively large diameter but a low overall height. In the latter case, the overall height can be in the range of 1 to 5 mm. Advantageously, the height is at most 5 mm, advantageously at most 4 mm, preferably at most 3 mm. The invention will be described in more detail below with reference to the schematic figures and without limitation thereto.

[0096] They show:

[0097] Fig. 1 : a known housing part with an asymmetrical electrical feedthrough with reinforced base body in the area of ​​the through opening,

[0098] Fig. 2: another known housing part with an asymmetrical electrical feedthrough with a base body with a flexible flange,

[0099] Fig. 3: a housing part with electrical feedthrough (comparative example),

[0100] Fig. 4: a first embodiment of the invention with a symmetrical bushing,

[0101] Fig. 5: a second embodiment of the invention with a symmetrical bushing and an asymmetrical connecting flange,

[0102] Fig. 6: a third embodiment of the invention with a symmetrical bushing and an asymmetrical connecting flange,

[0103] Fig. 7: a fourth embodiment of the invention with a symmetrical connecting flange and asymmetrical bushing,

[0104] Fig. 8: a fifth embodiment of the invention with a symmetrical connecting flange and asymmetrical bushing,

[0105] Fig. 9: a sixth embodiment of the invention with a symmetrical connecting flange and a symmetrical bushing, Fig. 10: a seventh embodiment of the invention with a symmetrical bushing and a fully coated core of the connecting pin,

[0106] Fig. 11 : an eighth embodiment of the invention with a symmetrical feedthrough and double-sided covering of a core of the terminal pin,

[0107] Fig. 12: a ninth embodiment of the invention with a symmetrical connecting flange, an asymmetrical leadthrough and one-sided covering of the core of the connecting pin,

[0108] Fig. 13: a tenth embodiment of the invention with a symmetrical connecting flange, a symmetrical leadthrough and covering of the core of the connecting pin on both sides in a flush design and

[0109] Fig. 14: a section of a schematic detailed representation.

[0110] Figure 1 shows a housing part 10 with an electrical feedthrough, which is known in the prior art. The housing part 10 comprises a base body 12 with a through-opening 14, into which a connecting pin 20 is inserted. The connecting pin 20 is held in the through-opening 14 in an electrically insulating manner by means of a fixing material 16. In order to provide mechanical stability and tightness of the feedthrough despite the low material thickness of the base body 12, the base body 12 has a reinforcement region with a width W, which borders the through-opening 14 and within which the base body 12 has an increased thickness d2. Outside the reinforcement region, the base body 12 has the smaller thickness di. On its outer edge 17, a connecting flange for connecting to another housing component is formed on the base body 12. The connecting flange is designed here as an example as a one-sided step, i.e.There is an asymmetrical connecting flange 18a. Figure 2 shows another housing part 10 known from the prior art with an electrical feedthrough, which, as described above, has a base body 12 with a through-opening 14 in which a connection pin 20 is held in an insulating manner via a fixing material 16. The base body 12 additionally comprises a flexible flange 30, which is obtained, for example, by forming the base body 12 and has a transition region with a width W, within which a flat section of the base body 12 transitions into a glazing section with a thickness d2 that is greater than the thickness di of the flat section of the base body 12. The base body 12 is flexible and yielding in the transition region, so that the region with the through-opening 14 is mechanically decoupled by the flexible flange 30.Accordingly, mechanical stresses from other parts of the housing are not transferred to the fixing material 16. Furthermore, the thickness d2 within the glazing section can be freely selected within a wide range, so that a glazing length can be adjusted independently of other dimensions of the base body 12 or of a housing with the base body. Even with a housing part 10 with a flexible flange 30, an asymmetrical connecting flange 18a can be provided on the outer edge 17 of the base body 12 for connecting to another housing component.

[0111] In Figures 1 and 2 it can be seen that due to regions of the base body 12 protruding from a housing part plane - such as reinforcement with thickness d2 and / or a flexible flange 30 - the geometric design of the top side of the housing part 10 differs from the geometric design of the underside of the housing part 10. - In general, in the context of the disclosure of the prior art, the exemplary embodiments according to the invention and the comparative example, the terms top side, i.e. the side of the housing part pointing upwards in the figure, and underside, i.e. the side of the housing part pointing downwards in the figure, are used solely to illustrate the description of the figures without reference to whether the corresponding side is later arranged in an electrical device towards the interior of the housing or points outwards.- With the help of areas protruding from the housing part plane, in particular parts of the base body 12, the identification of the top and bottom of the base body 12 or housing part 10 is easy. This enables reliable alignment of the individual housing parts for the production of the electrical feedthrough and / or the subsequent alignment of the housing part 10 for the assembly of a housing or cover.

[0112] However, Figures 1 and 2 also show the disadvantage of such known housing parts 10, namely that the protruding areas form space requirements that must be structurally accommodated inside the housing or outside the electrical device.

[0113] Figure 4 shows a first exemplary embodiment of a thin, compact housing part 10 according to the invention with a symmetrical electrical feedthrough. The housing part 10 comprises a base body 12 with a through-opening 14 into which a terminal pin 20 is inserted. The terminal pin 20, which here has two end faces 21 and a lateral surface, is held in the through-opening 14 in an electrically insulating manner by a fixing material 16. The fixing material 16 seals both against an inner wall of the through-opening 14 and against the terminal pin 20, so that the through-opening 14 is tightly closed by the fixing material 16, and a metal fixing material feedthrough is formed.

[0114] The illustrated housing part 10 is particularly suitable for use in connection with electrical storage devices such as batteries, in particular microbatteries, and capacitors. Accordingly, the housing part 10 can be a component of a housing for such an electrical storage device, for example a battery cover or a component of a battery cover. The connection pin 20 then forms, for example, a connection terminal of the electrical storage device. To form a housing or cover for the electrical storage device, the housing part 10 with an electrical feedthrough is joined to other housing components. If the housing part 10 is designed as a cover part, a housing for an electrical storage device can be formed by joining the cover part to a cup-shaped housing element.Alternatively, the housing part can be inserted into an opening provided in a cover element and thus become part of a cover. A cover constructed in this way comprises, in addition to the housing part 10 according to the invention in the form of the cover element with an opening, at least one further housing component.

[0115] Typically, at least one storage cell, such as a battery cell or a capacitor cell, is arranged inside such a storage device. To establish an electrical connection, one terminal of such a storage cell can be electrically connected to the terminal pin 20, and another terminal can be electrically connected to another housing part. Of course, it is also possible to form a plurality of through-openings 14 in a housing part 10 or base body 12 and to arrange a plurality of terminal pins 20, thus providing a multi-pole feedthrough.

[0116] As can be seen, a disk-shaped base body 12 with a substantially uniform thickness D is used within the scope of the invention. Substantially uniform thickness means that the base body 12 has the same thickness outside the region of the through-opening 14 as in an area adjacent to the through-opening 14. The base body 12 is therefore flat and does not have any reinforcing means produced by forming processes, such as reinforcement, collars, flexible flanges or the like. With such a housing part 10, thin, compact housings with a lot of volume in the housing interior can be provided. In addition, the base body 12 has a symmetrical feedthrough. The fixing material 16 and the connecting pin 20 are arranged symmetrically to a plane of symmetry S located centrally in the plane of the base body, so that the housing part 10 is symmetrical with respect to the feedthrough.In terms of geometry, there are therefore no differences between the top and bottom of the housing part 10. This means that the end face 21 or surface of the connecting pin 20 is spaced from the plane of symmetry S on the bottom of the housing part 10 by the same distance as the end face 21 on the top of the housing part 10. The same applies to the fixing material 16. Such a symmetrical housing part 10 can be manufactured with less effort, since measures for determining the orientation of the individual parts before placing them in melt molds can be omitted.

[0117] Furthermore, it is provided that the height H of the fixing material is greater than the thickness D of the base body in the region of the through-opening 14. The difference between height H and thickness D is distributed symmetrically between the sides of the housing part 10. The end faces of the fixing material 16 are thus each arranged to protrude beyond a surface of the disc-shaped base body 12. As can be seen, the opposing end faces of the fixing material 16, starting from the connecting pin 20, are arranged essentially parallel to one another - except for the contact area between the base body 12 and the fixing material 16. In other words, starting from the connecting pin 20, the fixing material 16 has an essentially uniform height - except for the contact area between the base body 12 and the fixing material 16. Towards the contact area between the fixing material and the base body, both end faces of the fixing material 16 converge towards the base body 12.In other words, the height of the fixing material 16 increases starting from the base body 12. The contact area between the fixing material and the base body coincides here with the wall of the through-opening 14, i.e. it lies in the area of ​​the wall of the through-opening. Such dimensioning of the fixing material also offers manufacturing advantages, as it ensures that there is sufficient fixing material 16 for secure fixing, in particular glazing, of the connecting pin 20 and that no undesirable menisci or even holes occur in the contact between the fixing material 16 and the connecting pin 20 and / or holes between the fixing material 16 and the base body 12. In addition, the height H of the fixing material 16 improves the insulation between the connecting pin 20 and the base body 12, so that a short circuit with the base body 10 when contacting the connecting pin 20 can be avoided.

[0118] In the first embodiment of the housing part 10 shown in Figure 4, both end faces 21 of the connecting pin 20 are flush with the corresponding surfaces or end faces of the fixing material 14.

[0119] With regard to the materials of the components, the connecting pin 20 can, for example, comprise ferritic steel. The base body 12 is preferably made of a steel with a higher coefficient of expansion than the material of the connecting pin 20; in particular, austenitic steel can be selected as the material for the base body 12. By selecting a low-melting fixing material 16 (for example, bismuth-based glass) in combination with a base body 12 made of austenitic stainless steel, a hermetically sealed pressure glazing can be provided. This choice of material can also be advantageous for other embodiments. Of course, other material combinations are possible and encompassed by the invention.

[0120] In the following figures, the same components as in figures 1 to 4 are given the same reference numerals.

[0121] Figure 5 shows a second embodiment of the invention with a symmetrical feedthrough, which is designed correspondingly to the first embodiment. As described with reference to the first embodiment with reference to Figure 4, the electrical feedthrough has a flat, disc-shaped base body 12 with a substantially uniform thickness D and a through-opening 14 in which a terminal pin 20 is held in an insulating manner via a fixing material 16. To avoid repetition, reference is made to the above explanations.

[0122] In contrast to the first exemplary embodiment, the base body 12 has a circumferential, asymmetrical connecting flange 18a on its outer edge 17, which here is designed in the form of a one-sided step. In addition to connecting to another housing component, e.g., by welding or soldering, such a connecting flange serves to align and center the housing part 10 during assembly of a housing or a cover. It can be advantageous if the other housing component has a mating flange that matches the connecting flange. In the second exemplary embodiment of the housing part 10 shown, both end faces 21 of the connecting pin 20 are also flush with the corresponding surfaces of the fixing material 14.

[0123] Figure 6 shows a third exemplary embodiment of the invention with a symmetrical feedthrough, which is designed similarly to the first and second exemplary embodiments, so that reference is made to the above explanations to avoid repetition. In contrast to the flush arrangement described above, in the third exemplary embodiment the connecting pin 20 is arranged in the symmetrical feedthrough such that both end faces 21 of the connecting pin 20 protrude the same distance beyond the corresponding surfaces of the fixing material 14. This allows, for example, simple contact to arresters, contact lugs, etc. As in the second exemplary embodiment, in the third exemplary embodiment an asymmetrical connecting flange 18a is provided on the outer edge 17 of the base body 12, which here, however, is implemented as a one-sided chamfer, bevel, etc.In principle, combinations of step and bevel are also possible to form an asymmetrical connecting flange. The exemplary embodiments shown in Figures 4 to 6 have in common that they have the described symmetrical feedthrough according to the invention. During the production of the housing part 10, it is therefore not necessary to determine on the base body 12 before placing it in the melting mold in which direction any existing asymmetrical connecting flange 18a of the base body 12 points, since the geometry of the top and bottom of the housing part do not differ except for any features present at the edge. Errors in the orientation of the base body 12 in the finished housing part 10 can therefore not occur, in contrast to the comparative example of a housing part 10 with an electrical feedthrough shown as an example in Figure 3.

[0124] The base body 12 of the comparative example from Figure 3 corresponds to the disc-shaped base body 12 shown in Figure 5 and here also has an asymmetrical connecting flange 18a. However, in the comparative example, the fixing material 16 and the connecting pin 20 are not arranged symmetrically to the plane of symmetry S located centrally in the base body plane. In order to ensure that the connecting pin 20 protrudes beyond the base body 12 on the desired side in the finished housing part 10 during the production of a housing part 10 with such an asymmetrical feedthrough and asymmetrical connecting flange 18a, the base body 12 must be oriented in advance during the housing part production so that it is inserted into the melt mold with the correct alignment of the asymmetrical connecting flange 18a.This is complex and errors can occur, especially when the base body 12 is very thin (for example for a microbattery) in which the one-sided step or one-sided bevel on the connecting flange is very small.

[0125] Figures 7 and 8 show exemplary embodiments of the second embodiment of the invention with a symmetrical connecting flange 18b. In the second embodiment of the invention, the housing part 10 also comprises a base body 12 with a through-opening 14 into which a connecting pin 20 is inserted. The connecting pin 20, which here has two end faces 21 and a lateral surface, is held in the through-opening 14 in an electrically insulating manner by a fixing material 16. The fixing material 16 seals both against an inner wall of the through-opening 14 and against the connecting pin 20, so that the through-opening 14 is tightly closed by the fixing material 16, and a metal fixing material feedthrough is formed.

[0126] As can be seen, a disc-shaped base body 12 with a substantially uniform thickness D is also used here. A substantially uniform thickness means that the base body 12 has the same thickness outside the area of ​​the through-opening 14 as in an area adjacent to the through-opening 14. The base body 12 is thus flat and does not have any reinforcing elements created by forming processes, such as reinforcement, collars, flexible flanges, or the like. With such a housing part 10, thin, compact housings with a large volume inside the housing can be provided.

[0127] On its outer edge 17, the flat base body 12 has a circumferential symmetrical connecting flange 18b, which is arranged symmetrically to a symmetry plane S located centrally in the base body plane, in that on the edge 17 of the base body 12, both on its top side and on its bottom side, matching chamfers or bevels (see Figure 7) or matching steps (see Figure 8) are formed, i.e. there is a chamfer and / or step on both sides. Combinations of chamfers and steps are also possible, as long as the symmetry of the connecting flange 18b is maintained. A base body with a symmetrical connecting flange can also have neither steps nor chamfers on the edge 17 (see base body in Figure 4). A symmetrical connecting flange 18b can also be used for centering, aligning and / or connecting to another housing component.It can be advantageous if the additional housing component has a counter flange that matches the connecting flange.

[0128] In the fourth embodiment of the invention shown in Figure 7 and the fifth embodiment of the invention shown in Figure 8, the fixing material 16 and the connecting pin 20 are not arranged symmetrically to a symmetry plane S lying centrally in the base body plane, in contrast to the previously described embodiments, so that the housing part is asymmetrical with respect to the feedthrough, ie there is an asymmetrical feedthrough.

[0129] In Figure 7, the end face 21 of the connection pin 20 located on the top side of the housing part 10 is at a greater distance from the plane of symmetry S than the end face 21 located on the underside. The fixing material 16 is also arranged correspondingly asymmetrically with respect to the plane of symmetry S. The difference between height H and thickness D is thus distributed asymmetrically between the sides of the housing part 10. As can be seen, the opposing end faces of the fixing material 16 are also arranged essentially parallel to one another here, starting from the connection pin 20 - except for the contact area between the base body 12 and the fixing material 16. In other words, the fixing material 16, starting from the connection pin 20 - except for the contact area between the base body 12 and the fixing material 16 - has an essentially uniform height.Towards the contact area between the fixing material and the base body, one end face of the fixing material 16 converges towards the base body 12 (here on the top side). In other words, the height of the fixing material 16 increases on one side, starting from the base body 12. Here too, the contact area coincides with the wall of the through-opening 14, i.e., it lies in the region of the wall of the through-opening. By way of example, it is shown that the lower end face of the fixing material 16 is flush with the underside of the base body 12. In the fourth exemplary embodiment, both end faces 21 of the connecting pin 20 are arranged flush with a respective surface or end face of the fixing material 16. Of course, different designs are possible, in which the end faces 21 of the connecting pin 20 protrude beyond the fixing material on one side or on both sides (see also Figure 8).It can also be seen that in the case of an asymmetrical feedthrough, an end face 21 of the connection pin 20 can advantageously be arranged flush with one side (here the underside) of the base body 12.

[0130] In contrast to the exemplary embodiment described in Figure 7, in the fifth exemplary embodiment shown in Figure 8, the end face 21 of the connecting pin 20 located on the underside of the housing part 10 is at a greater distance from the plane of symmetry S than the end face 21 located on the top, while the fixing material 16 is arranged symmetrically with respect to the plane of symmetry S. The difference between height H and thickness D is distributed symmetrically between the sides of the housing part 10. In addition, this exemplary embodiment shows by way of example that in a housing part 10 with a symmetrical connecting flange 18b, at least one end face 21 of the connecting pin 20 can be arranged to protrude beyond a surface or end face of the fixing material 16.

[0131] The designs of an asymmetrical bushing described in Figures 7 and 8 are purely exemplary. The described features can also be combined in any other way.

[0132] Because the asymmetrical bushing is realized with a base body 12 with a symmetrical connecting flange, the manufacturing effort for a housing part 10 is reduced, since the orientation of the base body 12, relative to the later top or bottom, is irrelevant during the production of the housing part 10. The sides of the housing part 10 only need to be identified during further processing, for example, when connecting to other housing parts, arresters, etc.

[0133] Figure 9 shows a sixth exemplary embodiment of the invention, in which the housing part 10 has both a symmetrical connecting flange 18b, here exemplarily shaped as a step on both sides, and a symmetrical electrical feedthrough which is designed correspondingly to the first exemplary embodiment. To avoid repetition, reference is made to the above explanations. It goes without saying that the symmetrical feedthrough can also be implemented differently, e.g. as in the third exemplary embodiment, and that the symmetrical connecting flange 18b can alternatively or additionally comprise, for example, a bevel on both sides. Such a symmetrical housing part 10 offers advantages not only during its production, but also during its further processing, since complex measures for determining the orientation of the housing part 10 can be omitted or reduced and the risk of orientation errors is reduced.

[0134] Figures 10 to 13 show further embodiments of the invention with a symmetrical electrical feedthrough and / or a symmetrical connecting flange. Since the same components as in Figures 1 to 9 are designated by the same reference numerals in the following figures, reference is made to the above explanations to avoid repetition, and the advantageous further developments are described in more detail below.

[0135] In the figures it can be seen that the connection pin 20 has a core 22 made of a first electrically conductive material and that at least on a first side of the electrical feedthrough a first end face of the core 22 is covered with a covering material 24 made of a second electrically conductive material, wherein the covering material 24 and the fixing material 16 are advantageously designed and arranged such that at least on the first side of the electrical feedthrough the first electrically conductive material of the core 22 is inaccessible.

[0136] As with the exemplary embodiments described above, the material properties of the terminal pin 20, particularly with regard to its thermal expansion coefficient, must be adapted to the requirements of the metal-fixing material feedthrough formed. To prevent or at least reduce corrosion of the terminal pin 20, the material of the terminal pin 20 should also advantageously be adapted to the materials used in the storage cell, such as the materials of the current collectors, electrode materials, and electrolytes.In order to meet both requirements, an advantageous development provides that the connection pin 20 has a core 22 made of a first electrically conductive material, which is adapted to the requirements of the metal fixing material feedthrough, and has a cover material 24 made of a second electrically conductive material on one end face, which is adapted to the requirements of the storage cell in order to prevent or at least reduce corrosion, for example. The cover material 24 and the fixing material 16 are advantageously arranged in the electrical feedthrough such that the core material 22 of the connection pin is inaccessible on a first side of the feedthrough, on which the cover material 24 is located. For this purpose, the cover material 24 preferably borders directly on the fixing material 16.

[0137] The covering material 24 can be located on the side of the electrical feedthrough that faces inward when forming a housing. The second electrically conductive material can be applied, for example, to the end face of the core 22 of the terminal pin 20 by plating. However, other variants for applying the second electrically conductive material are also conceivable. For example, thin sheets or foils made of the second electrically conductive material can be connected to the core 22 by welding or soldering, or the second electrical material can be applied by galvanic coating or a vapor deposition process.

[0138] With regard to the materials of the components, a multi-part terminal pin 20 can, for example, have a core 22 made of ferritic steel as the first electrically conductive material and, on at least one side of the core 22, a covering material 24, 25 made of aluminum or an aluminum alloy as the second electrically conductive material, for example in the case of a design of the housing part for use in a lithium-ion battery. The base body 12 can be formed from a steel with a higher coefficient of expansion than the material of the core 22; in particular, austenitic steel can be selected as the material for the base body 12. By selecting a low-melting fixing material 16, e.g., a bismuth-based glass, a hermetically sealed pressure glazing can be provided in combination with a base body 12 made of austenitic stainless steel. Of course, other material combinations are possible and encompassed by the invention.

[0139] In embodiments with symmetrical feedthrough and asymmetrical connecting flange 18a (see Figures 10, 11 ), it is important that the connecting pin 20 with core 22 and covering material 24 is constructed symmetrically:

[0140] In the seventh exemplary embodiment in Figure 10, the core 22 of the terminal pin 20 is completely coated, so that all surfaces of the core 22 are covered by the covering material 24. Accordingly, in particular, both end faces and one lateral surface of the core 22 are covered by the covering material 24. Both end faces 21 of the terminal pin 20 are, for example, flush with the corresponding surfaces of the fixing material 14. Alternatively, however, they could also protrude beyond the fixing material 14. In the eighth exemplary embodiment in Figure 11, a second end face of the core 22, opposite the first end face, is covered with a further covering material 25 made of a third electrically conductive material, which is selected to be identical to the second electrically conductive material. Furthermore, one lateral surface of the core 22 of the terminal pin 20 remains free of the covering material 24.This ensures that the cover material 24 does not change the properties of the metal fixing material feedthrough. The two materials can thus be selected completely independently of one another in order to achieve optimal adaptation to the requirements of the storage cells inside the housing and on the outside of the housing, as well as to the design of the metal fixing material feedthrough. Both end faces 21 of the connection pin 20 protrude, for example, above the corresponding surfaces or end faces of the fixing material 14. Because the cover material 24 and the fixing material 16 are designed and arranged such that the first electrically conductive material of the core 22 is inaccessible on both sides of the electrical feedthrough, the core is protected from corrosion and can also be contacted more effectively.

[0141] In embodiments with a symmetrical connecting flange 18b (see Figures 12 and 13), the connecting pin 20 with core 22 and covering material 24 can also be constructed asymmetrically:

[0142] In the ninth exemplary embodiment in Figure 12, the end faces 21 of the connecting pin 10 are at different distances from the plane of symmetry S, and one end face 21 of the connecting pin 20 protrudes beyond the fixing material 16, while the other end face 21 can be flush. In contrast to the previously described exemplary embodiments, a covering material 24 is provided on only one side of the core 22. In this embodiment, the core 24 is accessible from the side, which may be possible if, for example, the material of the core 24 is not susceptible to corrosion or if corrosion is prevented by other measures. In this case, the covering material 24 can serve, for example, to improve electrical contact. Alternatively, the arrangement of the covering material 24 could be selected such that, in interaction with the fixing material 16, the first electrically conductive material of the core 22 is not accessible by the fixing material 16 being directly adjacent to the covering material 24.

[0143] In the tenth exemplary embodiment in Figure 13, the connecting flange and the feedthrough are symmetrical, while the terminal pin is asymmetrical. A second end face of the core 22, opposite the first end face, is covered with a further covering material 25 made of a third electrically conductive material, which is selected to be different from the second electrically conductive material. With a different selection, the second electrically conductive material, in particular, can be adapted to the requirements of the materials of a storage cell, and the third electrically conductive material can be optimized, for example, for simple and secure connection to electrical terminals. Welding properties or soldering properties, for example, can be used as a criterion for material selection.- If the cover materials had alternatively been chosen the same in the embodiment shown, a housing part 10 would have been realized with a symmetrical feedthrough, a symmetrical connection pin and a symmetrical connecting flange.

[0144] Figure 14 shows a section of a schematic detailed drawing, the features and advantageous variants of which - with appropriate adaptation if necessary - can be combined with any exemplary embodiment, in particular the exemplary embodiments described above. A symmetrical feedthrough is shown purely as an example. Of course, advantageous asymmetrical feedthroughs can also be realized. In the illustration of the housing part 10 in vertical cross-section, the base body 12 has a distance A from the connecting pin 20 arranged in its through-opening 14, which is filled with fixing material 16. The distance A is thus the distance between the wall of the through-opening 14 and the wall of the connecting pin 20. The connecting pin 20 has a thickness I.

[0145] As in the other figures, it can also be seen here that in the region of the through-opening 14, the height H of the fixing material 16 is greater than the thickness D of the base body 12. Both end faces of the fixing material 16 are arranged here so as to protrude beyond a surface of the base body 12. Starting from the connecting pin 20, the opposing end faces of the fixing material 16 are arranged essentially parallel to one another, except for the contact area between the base body 12 and the fixing material 16. In other words, starting from the connecting pin 20, the fixing material 16 has an essentially uniform height H, except for the contact area between the base body and the fixing material.

[0146] Towards the contact area between the fixing material and the base body, both end faces of the fixing material 16 converge towards the base body 12. In other words, the height of the fixing material 16 increases from the base body 12 toward the connecting pin 20. In the case of the solid line of the fixing material 16, the contact area between the surface of the fixing material 16 and the base body 12 coincides with the wall of the through-opening 14, but this need not be the case; see the dashed extension of the fixing material, which illustrates a fixing material overflow 28, which is described further below.

[0147] By freely adjusting the slope or curvature 26 of the fixing material contour in the area where the surface of the fixing material 16 comes into contact with the base body 12, volume fluctuations in the fixing material and fluctuations in the dimensions of the components can be compensated. Depending on the volume of the fixing material and the design conditions, the slope or curvature 26 can be steeper or flatter, and the fixing material can even cover the edge of the through-hole and form a fixing material overflow (see below).

[0148] When observing the fixing material 16 represented by a solid line, the desired substantially uniform height H of the fixing material is reached in the example shown at the latest after approximately 15% of the distance A between the base body 12 and the connecting pin 20, with the base body being the reference point, i.e., the starting point for the observation. Thus, a plateau P quickly forms in which the fixing material 16 has a substantially constant height and the end faces of the fixing material run substantially parallel to one another. A plateau P with a constant height of the fixing material advantageously extends over at least 85% of the distance between the base body and the connecting pin.

[0149] In an advantageous variant of the housing part 10, the fixing material 16 not only protrudes beyond the surface of the base body 12, but also covers the edge of the through-opening 14 and also an area of ​​the upper side of the base body adjacent to the through-opening 14 (see dashed line of the fixing material). In the example shown, the coverage is symmetrical on both sides of the base body. However, asymmetrical variants and / or one-sided variants are also possible. A fixing material overflow 28 or a fixing material coverage is realized. This creates an even larger reservoir for the fixing material 16, and the insulation effect is enhanced. Compared to the variant without a fixing material coverage 28, the width of the plateau P is even greater. A plateau with an essentially constant height of the fixing material extends here over more than 100% of the distance A between the base body 12 and the connection pin 20.Furthermore, Figure 14 shows that in the housing part 10, an imaginary tangent applied to the surface of the fixing material 16 at the contact point with the connecting pin forms a contact angle a with the connecting pin 20 of approximately 90°. In other words, a right angle exists, naturally within the limits of the usual manufacturing tolerances, here preferably 90° with a deviation of + / - 2°. This provides a hermetic connection and, at the same time, a compact feedthrough. A larger contact angle outside the aforementioned deviation, ie, an obtuse angle between the tangent and the connecting pin, leads to a groove in the contact area between the fixing material 16 and the connecting pin 20, which makes it more difficult to produce a hermetically sealed feedthrough. A smaller contact angle outside the aforementioned deviation, ie,An acute angle, i.e., an acute angle between the tangent and the connecting pin, occurs when there is a pull-up of the fixing material 16 at the circumference of the connecting pin 20, also called the meniscus. This is disadvantageous because there is a risk of fixing material getting onto the end face 21 of the connecting pin 20.

[0150] Figure 14 schematically illustrates the ideal case of a symmetrical feedthrough, in which the symmetry plane S located centrally in the base body plane and a terminal pin symmetry plane S' located centrally in the terminal pin plane are superimposed, i.e., they are not spaced apart. However, due to manufacturing tolerances in the individual components of the housing part and the molds required for production, a deviation between the symmetry planes may occur, which is preferably less than 4% of the thickness I of the terminal pin 20.

[0151] Above, only a few of the possible feature combinations were described by way of example with reference to Figures 4 to 14. Many other combinations of features relating to a feedthrough (symmetrical, asymmetrical), features relating to a connecting flange (symmetrical, asymmetrical), and features relating to a terminal pin (symmetrical, asymmetrical) are possible and encompassed by the invention.

[0152] The invention provides flat, compact housing parts 10 with improved symmetry and lower manufacturing costs, which are particularly suitable for an electrical device, in particular for an electrical energy storage device. The housing parts can be used to provide storage devices which are themselves constructed so compactly that as much volume as possible is available inside the housing, whereby the storage device, e.g. battery and / or the capacitor, can have the highest possible capacity. The housing parts according to the invention are particularly advantageous for microbatteries. However, the invention can also be used for larger storage devices and other electrical devices, for example sensor housings. In general, the invention can be used for electrical feedthroughs of all kinds, for example also for housings for electronic components.In addition, the invention provides a universally applicable standard bushing that is independent of the dimensions of other housing components and / or the housing.

[0153] List of reference symbols

[0154] 10 Housing part

[0155] 12 basic bodies

[0156] 14 passage opening

[0157] 16 Fixing material

[0158] 17 outer edge of 12

[0159] 18a asymmetrical connecting flange

[0160] 18b symmetrical connecting flange

[0161] 20 connection pins

[0162] 21 front side of 20

[0163] 22 core

[0164] 24 Covering material

[0165] 25 additional covering material

[0166] 26 Curvature

[0167] 28 Fixing material overflow

[0168] 30 flexible flange d1 first thickness in the prior art d2 second thickness in the prior art

[0169] W Width in the state of the art

[0170] D thickness of 12

[0171] S symmetry plane of 12

[0172] S' symmetry plane of 20

[0173] H height of 16

[0174] A distance between 12 and 20

[0175] I Thickness of 20

[0176] P Plateau a Contact angle between 16 and 20

Claims

Claims 1. A housing part (10), in particular for an electrical storage device, with an electrical feedthrough comprising a base body (12) with a through-opening (14) and a connecting pin (20) arranged in the through-opening (14), which is held in an electrically insulating manner in the through-opening (14) by means of a fixing material (16), characterized in that the base body (12) of the housing part (10) is flat and disc-shaped with a substantially uniform thickness (D), and a height (H) of the fixing material (16) is greater than the thickness (D) of the base body (12), wherein i) the base body (12) has a symmetrical feedthrough in that the fixing material (16) and the connecting pin (20) are arranged symmetrically to a plane of symmetry (S) lying centrally in the base body plane, and / or ii) the base body (12) has a symmetrical connecting flange (18b) on its outer edge (17),which is arranged symmetrically to a plane of symmetry (S) lying centrally in the plane of the base body., 2. Housing part (10) according to claim 1, characterized in that the base body (12) with the symmetrical passage has a connecting flange on the outer edge, which preferably has a one-sided step or one-sided chamfer.

3. Housing part (10) according to claim 1 or 2, characterized in that the end faces (21) of the connecting pin (20) are each arranged flush with a surface of the fixing material (16).

4. Housing part (10) according to claim 1 or 2, characterized in that both end faces (21) of the connecting pin (20) are arranged projecting beyond a surface of the fixing material (16).

5. Housing part (10) according to one of claims 1 to 4, characterized in that the base body (12) has a thickness in the range 0.1 mm to 1 mm, preferably 0.15 mm to 0.8 mm, in particular 0.15 mm to 0.6 mm.

6. Housing part (10) according to one of claims 1 to 5, characterized in that the material of the base body (12) and / or material of the connecting pin (20) are selected from steel, in particular ferritic, austenitic or duplex steel, stainless steel, stainless steel, stainless steel, iron-nickel alloys, iron-nickel-cobalt alloys, KOVAR, molybdenum, titanium, titanium alloy, aluminum or aluminum alloy.

7. Housing part (10) according to one of claims 1 to 6, characterized in that the connection pin (20) has a core (22) made of a first electrically conductive material and that at least on a first side of the electrical feedthrough a first end face of the core (22) is covered with a covering material (24) made of a second electrically conductive material, wherein the covering material (24) and the fixing material (16) are advantageously designed and arranged such that the first electrically conductive material of the core (22) is inaccessible on the first side of the electrical feedthrough.

8. Housing part (10) according to claim 7, characterized in that a second end face of the core (22) opposite the first end face is covered with a further covering material (25) made of a third electrically conductive material, which is selected to be identical or different to the second electrically conductive material.

9. Housing part (10) according to one of claims 7 or 8, characterized in that the second electrically conductive material and / or the third electrically conductive material of the connection pin (20) is selected from aluminum, an aluminum alloy, AlSiC, copper, a copper alloy, molybdenum, nickel or nickel alloys, palladium, silver or gold.

10. Housing part (10) according to one of claims 1 to 9, characterized in that the fixing material (16) is a glass, a glass ceramic or a ceramic or that the fixing material (16) comprises a glass, a glass ceramic or a ceramic.

11. Housing part (10) according to one of claims 1 to 10, characterized in that a first expansion coefficient of the base body (12) is greater than a second expansion coefficient of the fixing material (16) or that the expansion coefficients of the base body (12) and the fixing material (16) are adapted to one another.

12. Housing part (10) according to one of claims 1 to 11, characterized in that the fixing material (16) and its connection to the wall of the through-opening (14) and the connecting pin (20) are designed in such a way that a safety valve function is provided above a predetermined extrusion force, wherein the predetermined extrusion force is set by one or more of the following measures: a. selecting the thickness of the glazing, b. selecting the fixing material (16), c. selecting the bubble content in the fixing material (16), d. structuring the surface of the fixing material (16) by adjusting the shape of a fixing material molding prior to glazing, e. structuring the surface of the fixing material (16) during glazing, f. laser processing of the surface of the fixing material (16) after glazing, g. one- or two-sided introduction of notches or tapers into the fixing material (16) and / or h. introduction of notches or tapers into the connecting pin (20) and / or the base body (12).

13. Electrical storage device, in particular a battery, preferably a microbattery, or a capacitor, comprising a housing with a housing part (10) according to one of claims 1 to 12.

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