# US 2019/0320539 A1 · Electrical Assembly > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0320539 A1 - Document ID: US20190320539A1 - Status: Published application - Kind: A1 - Application number: 16/464,868 - Filed: 2017-09-05 - Published: 2019-10-17 - Earliest claimed: 2016-12-02 - Assignees: Robert Bosch GmbH - Applicants: Robert Bosch GmbH - Inventors: Stefan Moeller - Web page: https://patentgrep.com/patent/US20190320539A1 ## CPC - H05K 5/0082: {specially adapted for transmission control units, e.g. gearbox controllers} - H01G 9/08: Housing; Encapsulation - H01G 9/26: Structural combinations of electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices with each other - H05K 3/284: {for encapsulating mounted components (H05K1/185 takes precedence)} - H05K 5/0034: {having an overmolded housing covering the PCB} - H05K 2203/1316: Moulded encapsulation of mounted components - H05K 2203/1327: Moulding over PCB locally or completely - H05K 2203/304: Protecting a component during manufacturing - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS - H01G: CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE (selection of specified materials as dielectric H01B3/00; capacitors having potential barriers H10D1/62, H10K10/10) ## Abstract An electrical assembly includes a printed circuit board substrate, at least one electrical component which is arranged on the printed circuit board substrate and with which the printed circuit board substrate makes electrical contact, a protective cap which is arranged above the electrical component, and a sheathing material which is applied to the printed circuit board substrate over the protective cap and which covers at least the protective cap on the outside in such a way that the protective cap is provided with at least one filling opening. The sheathing material is introduced through the at least one filling opening into a cap interior between the protective cap and the printed circuit board substrate in such a way that a clearance, which is not filled with the sheathing material and which directly adjoins the at least one electrical component, remains between the protective cap and the printed circuit board substrate. ## Claims ### Claim 1 An electrical assembly comprising: a circuit board substrate; at least one electrical component disposed on the circuit board substrate and electrically connected to the circuit board substrate; a protective cap placed over the electrical component; and an encapsulating material applied to the circuit board substrate over the protective cap, which at least covers the protective cap from the outside, wherein the protective cap defines at least one filling opening, and wherein the encapsulating material is introduced via the at least one filling opening into an internal chamber of the protective cap defined between the protective cap and the circuit board substrate in such a way that a free space remains between the protective cap and the circuit board substrate that is not filled with the encapsulating material, the free space directly adjoining the at least one electrical component. ### Claim 2 (depends on 1) The electrical assembly as claimed in claim 1, wherein the free space that is not filled with the encapsulating material forms a balancing chamber and the at least one electrical component or parts of the at least one electrical component are configured to partially expand into the balancing chamber. ### Claim 3 (depends on 1) The electrical assembly as claimed in claim 1, wherein the at least one filling opening of the protective cap is connected to the free space via a channel structure that is labyrinthine when viewed in cross-section perpendicular to the circuit board substrate. ### Claim 4 (depends on 1) The electrical assembly as claimed in claim 1, wherein the at least one filling opening is formed as a throttle point so as to dampen pressure spikes during filling of the encapsulating material. ### Claim 5 (depends on 1) The electrical assembly as claimed in claim 1, wherein the protective cap comprises: a cap wall peripherally enveloping an electrical component of the at least one electrical component, the cap wall placed perpendicularly on the conductor substrate; and a cover section on a side facing away from the circuit board substrate and over the electrical component, wherein the filling opening is defined in a transition region between the cover section and the cap wall. ### Claim 6 (depends on 5) The electrical assembly as claimed in claim 5, wherein the cover section comprises a collar protruding into the internal chamber of the protective cap. ### Claim 7 (depends on 6) The electrical assembly as claimed in claim 6, wherein the collar of the cover section protruding into the internal chamber of the protective cap includes the electrical component at an end of the collar facing away from the circuit board substrate in such a way that there is a very narrow space defined between the collar and the electrical component that is connected to the free space. ### Claim 8 (depends on 1) The electrical assembly as claimed in claim 1, wherein the free space is filled with a gas. ### Claim 9 (depends on 1) The electrical assembly as claimed in claim 1, wherein the protective cap defines a plurality of internal cap chambers, and an electrical component of the plurality of electrical components is disposed in each of the plurality of internal cap chambers. ### Claim 10 (depends on 1) The electrical assembly as claimed in claim 1, wherein one or more of the at least one electrical components is a capacitor. ### Claim 11 (depends on 1) The electrical assembly as claimed in claim 1, wherein the electrical assembly is configured for use in a hydraulic fluid of a motor vehicle transmission. ### Claim 12 (depends on 3) The electrical assembly as claimed in claim 3, wherein the a channel structure is U-shaped, when viewed in cross-section perpendicular to the circuit board substrate. ### Claim 13 (depends on 8) The electrical assembly as claimed in claim 8, wherein the free space is filled with air. ### Claim 14 (depends on 10) The electrical assembly as claimed in claim 10, wherein the capacitor is an electrolytic capacitor.