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EP-4740232-A1 - ELECTRICAL FEEDTHROUGH AND ENERGY STORE WITH SUCH A FEEDTHROUGH

EP4740232A1EP 4740232 A1EP4740232 A1EP 4740232A1EP-4740232-A1

Abstract

An electrical feedthrough (10), in particular for an electrical storage device, is provided. The electrical feedthrough (10) comprises a main body (12) with a through-opening (14) and also comprises a terminal pin (20), which is located in the through-opening (14) and is held in the through-opening (14) in an electrically insulating manner by a fixing material (16). It is also provided that the terminal pin (20) consists of a layered composite material or comprises a layered composite material and has a core (22) of copper or a copper alloy or CuSiC as a first electrically conductive material and, at least on a first side of the electrical feedthrough (10) , a covering material (24) of aluminium or an aluminium alloy or AlSiC as a second electrically conductive material, which covers a first end face (23a) of the core (22), wherein the terminal pin (20) and the fixing material (16) are formed and located in such a way that a transition (26a) from the core (22) to the covering material (24) lies outside the fixing material (16).

Inventors

  • HARTL, HELMUT

Assignees

  • SCHOTT AG

Dates

Publication Date
20260513
Application Date
20240702

Claims (18)

  1. 1. Electrical feedthrough (10), in particular for an electrical storage device, comprising a base body (12) with a through-opening (14) and a connection pin (20) arranged in the through-opening (14), which is held in the through-opening (14) in an electrically insulating manner via a fixing material (16), characterized in that the connection pin (20) consists of a layered composite material or comprises a layered composite material and has a core (22) made of copper or a copper alloy or CuSiC as the first electrically conductive material and has at least on a first side of the electrical feedthrough (10) a covering material (24) made of aluminum or an aluminum alloy or AlSiC as the second electrically conductive material, which covers a first end face (23a) of the core (22), wherein the connection pin (20) and the fixing material (16) are designed and arranged in such a way that a transition (26a) from the core (22) to the covering material (24) is outside the fixing material (16) lies.
  2. 2. Electrical feedthrough (10) according to claim 1, wherein a lateral surface (23c) of the core (22) facing the fixing material (16) is at least partially not covered with covering material (24, 25) and directly adjoins the fixing material (16).
  3. 3. Electrical feedthrough (10) according to claim 1 or 2, characterized in that a melting temperature of the fixing material (16) is selected to be lower than the melting point of all materials of the connection pin (20).
  4. 4. Electrical feedthrough (10) according to one of claims 1 to 3, characterized in that the second electrically conductive material is applied to the end face of the core (22) by means of plating, galvanizing, coating, vapor deposition, welding or soldering.
  5. 5. Electrical feedthrough (10) according to one of claims 1 to 4, characterized in that the connecting pin (20) is a plated connecting pin which consists of a plated layer composite material or such a layer composite material comprising a layer of copper or a copper alloy and at least one layer of aluminum or an aluminum alloy.
  6. 6. Electrical feedthrough (10) according to one of claims 1 to 5, characterized in that the fixing material (16) has a height (H) and the base body (12) has a thickness (D, d 2 ) in a region adjacent to the through opening (14), wherein in a contact region between the base body (12) and the fixing material (16) the height (H) is less than the thickness (D).
  7. 7. Electrical feedthrough (10) according to one of claims 1 to 6, characterized in that an end face (21a, 21b) of the connection pin (20) is arranged flush with a surface of the base body (12).
  8. 8. Electrical feedthrough (10) according to one of claims 1 to 7, characterized in that one end face (21a, 21b) or both end faces (21a, 21b) of the connection pin (20) are arranged to protrude beyond a surface of the base body (12).
  9. 9. Electrical feedthrough (10) according to one of claims 1 to 8, characterized in that the material of the base body (12) is selected from light metal, light metal alloy, AlSiC, steel, in particular ferritic, austenitic or duplex steel, stainless steel, stainless steel, tool steel.
  10. 10. Electrical feedthrough (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. 11. Electrical feedthrough (10) according to one of claims 1 to 10, characterized in that a first thermal expansion coefficient of the base body (12) is greater than a second thermal expansion coefficient of the fixing material (16) or that the thermal expansion coefficients of the base body (12) and the fixing material (16) are adapted to one another.
  12. 12. Electrical feedthrough (10) according to one of claims 1 to 11, characterized in that the base body (12) has a relief device (31).
  13. 13. Connection pin (20) for an electrical feedthrough (10), in particular for an electrical feedthrough (10) according to one of claims 1 to 12, wherein the connection pin (20) has a cylindrical body or is in the form of a cylindrical body and wherein the connection pin (20) consists of a layered composite material or comprises a layered composite material which has a layer of a first electrically conductive material, preferably selected from copper or a copper alloy, and at least one layer of a second electrically conductive material, preferably selected from aluminum or an aluminum alloy, wherein the layer of the first electrically conductive material forms a core (22) of the connection pin (20) and the at least one layer of the second electrically conductive material forms a covering material (24) on a first end face (23a) of the core (22).
  14. 14. Connection pin (20) according to claim 13, characterized in that the core (22) makes up at least or more than 50%, advantageously at least 55%, preferably at least 60% of the length of the connection pin (20).
  15. 15. Connection pin (20) according to one of claims 13 or 14, characterized in that it is a plated, preferably roll-plated, connection pin (20).
  16. 16. Connection pin (20) according to one of claims 13 or 15, characterized in that it is a cut, preferably punched, connection pin (20).
  17. 17. Use of a connection pin (20) according to one of claims 13 to 16 in an electrical feedthrough, in particular according to one of claims 1 to 12.
  18. 18. Electrical storage device, in particular a battery or a capacitor, comprising a housing with at least one electrical feedthrough (10) according to one of claims 1 to 12 and/or with a connection pin (20) according to one of claims 13 to 16.

Description

Electrical feedthrough and energy storage with such a feedthrough The invention relates to an electrical feedthrough, in particular for an electrical storage device, comprising a base body with a through-opening and a connection 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 a connection pin for an electrical feedthrough. A further aspect relates to an electrical energy storage device which comprises at least one such feedthrough. Electrical energy storage devices such as batteries or capacitors, the latter including supercapacitors, are used in a variety of applications for storing and providing electrical energy. The electrical energy storage devices usually comprise a housing and at least one storage cell accommodated in the housing. The storage cell can be electrically contacted from the outside via at least one electrical feedthrough in the housing. Batteries in the sense of the invention are understood to mean both a disposable battery that can be disposed of and/or recycled after it has been discharged, 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. The batteries can replace traditional energy sources such as lead-acid batteries, nickel-cadmium batteries or nickel-metal hydride batteries. The battery can also be used in sensors or in the Internet of Things. Supercapacitors, also called supercaps, are, as is well known, electrochemical energy storage devices with a particularly high power density. Unlike ceramic, film and electrolytic capacitors, supercapacitors do not have a dielectric in the traditional sense. In particular, they implement the storage principles of static storage of electrical energy through charge separation in a double-layer capacitance and the electrochemical storage of electrical energy through charge exchange with the help of redox reactions in a pseudocapacitance. Supercapacitors include in particular hybrid capacitors, in particular lithium-ion capacitors. Their electrolyte usually comprises a solvent in which conductive salts are dissolved, usually lithium salts. Supercapacitors are preferably used in applications in which a high number of charge/discharge cycles are required. Supercapacitors are particularly advantageous in the automotive sector, in particular in the field of recuperation of braking energy. Other applications are of course also possible and covered by the invention. EP 2 371 419 A2 shows an electrical feedthrough of a capacitor for medical implants and methods for producing and using such a capacitor. It is disclosed that the connection pin can consist of two pin sections, a first pin section made of Pt, Pt/Ir, FeNi, FeNiCo, FeCr, Nb, Ta, Mo, W, Cr, FeCr, V or Ti and a second pin section comprising aluminum, wherein the joint between the pin sections is arranged within a glass plug or a filler plug. US 2014/212741 A1 discloses a conductor for an electrochemical battery, which has two sections, a first section made of a light metal facing the outside, and a second section made of copper facing the inside. The transition between the two sections is closed off by a mechanical seal. WO 2016/074932 shows a housing or a housing part with a feedthrough that comprises a pin-shaped conductor with a first section made of light metal and a second section made of copper or copper alloy. The pin-shaped conductor is held in an insulating manner in a through-opening in the housing or housing part via a glass or glass-ceramic material, with the transition between the different sections of the pin-shaped conductor being in the region of the glass or glass-ceramic material. DE 102021 133 391 A1 discloses a housing part for an electrical storage device in which a connection pin is electrically insulated in a base body is fixed in a through-opening formed in the body. To provide a connection point for an electrical conductor, a connection pad is provided which is subsequently connected to the connection pin in an additional work step by attaching the connection pad to the base body in an electrically insulating manner using an insulating material, for example using an adhesive or a cast material which engages in undercuts in the base body and/or on the connection pad. A microbattery is known from WO2021/185648 A1, which is characterized by a particularly compact design. A metal fixing material feedthrough for an electrical connection of the microbattery can be designed as a pressure glazing, so that a particularly reliable seal of the feedthrough is achieved. A disadvantage of the known metal fixing material feedthroughs with pressure glazing or adapted feedthroughs is that they cannot yet be reliably manufactured with a connection pin made of any or desired materials. Connection