# US 10,504,809 B2 · Method for producing an electrical device comprising a covering material > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,504,809 B2 - Document ID: US10504809B2 - Status: Granted - Kind: B2 - Application number: 15/775,345 - Filed: 2016-11-17 - Published: 2018-11-15 - Granted: 2019-12-10 - Earliest claimed: 2015-11-26 - Assignees: Robert Bosch GmbH - Applicants: Robert Bosch GmbH - Inventors: Tjalf Pirk; Helmut Schmidt; Petra Stedile - Web page: https://patentgrep.com/patent/US10504809B2 ## CPC - H10W 74/43: comprising oxides, nitrides or carbides, e.g. ceramics or glasses - H10W 42/00: Arrangements for protection of devices (arrangements for thermal protection H10W40/00) - H10W 74/01: Manufacture or treatment - H10W 74/121: {by multiple encapsulations, e.g. by a thin protective coating and a thick encapsulation} - H10W 74/131: {the semiconductor body being only partially enclosed} - H10W 74/40: characterised by their materials - H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10 ## Abstract A method for producing an electrical device including an electrical component at least partially covered by a covering material having a cement material includes supplying the cement material, mixing an additive into the cement material, applying the covering material having the cement material with the additive onto the electrical component, and treating the covering material. The treatment allows the additive from the cement material to reach a surface of the cement material and to form a protective layer on the surface. ## Claims ### Claim 1 A method of producing an electrical device including an electrical component at least partly enveloped by an envelope material having a cement material, the method comprising: mixing an admixture into the cement material; applying the envelope material including the cement material comprising the admixture to the electrical component; and treating the envelope material so as to cause the admixture from the cement material to arrive at a surface of the cement material and to form a protective layer at the surface. ### Claim 2 (depends on 1) The method as claimed in claim 1, wherein the cement material includes calcium aluminate cement. ### Claim 3 (depends on 1) The method as claimed in claim 1, wherein the protective layer is water vapor-impermeable. ### Claim 4 (depends on 1) The method as claimed in claim 1, wherein treating the envelope material comprises at least one of the following treatments: subjecting the envelope material to vibration, agitation movements and/or spinning movements; heat-treating the envelope material; exposing the envelope material in a defined gas atmosphere; subjecting the envelope material to a defined pressure; and subjecting the envelope material to electromagnetic radiation. ### Claim 5 (depends on 1) The method as claimed in claim 1, wherein treating the envelope material causes the admixture to float up and/or to diffuse and/or to coagulate and/or to swell up to the surface of the cement material. ### Claim 6 (depends on 5) The method as claimed in claim 5, wherein the admixture: floats up to the surface of the cement material in the liquid cement material during a gelation phase; and/or diffuses to the surface of the cement material via a particle size gradient and/or a density gradient in the cement material during a drying phase; and/or coagulates based on its concentration; and/or swells up as a result of a reaction. ### Claim 7 (depends on 5) The method as claimed in claim 5, wherein the admixture swells up to the surface of the cement material, polymerizes, and cures to form the protective layer. ### Claim 8 (depends on 1) The method as claimed in claim 1, wherein the admixture is selected from the group consisting of monomers, polymers, silicone, inorganic substances, oxides, nitride, and ceramics. ### Claim 9 (depends on 1) The method as claimed in claim 1, wherein treating the envelope material comprises: mixing a binder and/or a swellant into the cement material in order to keep the admixture at the surface of the cement material. ### Claim 10 An electrical device, comprising: an envelope material including a cement material; an electrical component at least partly enveloped by the envelope material; and a protective layer disposed at a surface of the cement material and including an admixture configured to arrive from an interior of the cement material at the surface of the cement material so as to form the protective layer at the surface, wherein the admixture is also disposed in the interior of the cement material. ### Claim 11 (depends on 10) The electrical device as claimed in claim 10, wherein the admixture is further configured to be mixed into the cement material and to float and/or diffuse out of the interior of the cement material to the surface of the cement material, and/or coagulate and/or swell so as to form the protective layer at the surface. ### Claim 12 (depends on 10) The electrical device as claimed in claim 10, wherein the protective layer is configured to break down or to carbonate at a particular temperature not less than 250° C. ### Claim 13 (depends on 10) The electrical device as claimed in claim 10, wherein the electrical component is a semiconductor component, a sensor element, an inductance, a capacitance, a battery cell, a battery module, or a circuit.