# US 10,872,833 B2 · Electronic module, method

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- Number: US 10,872,833 B2
- Document ID: US10872833B2
- Status: Granted
- Kind: B2
- Application number: 16/474,785
- Filed: 2017-12-22
- Published: 2019-11-14
- Granted: 2020-12-22
- Earliest claimed: 2016-12-28
- Assignees: Robert Bosch GmbH
- Applicants: Robert Bosch GmbH
- Inventors: Bernd Rometsch; Georg Hejtmann; Martin Rittner; Stefan Kaessner
- Web page: https://patentgrep.com/patent/US10872833B2

## CPC

- H10W 74/43: comprising oxides, nitrides or carbides, e.g. ceramics or glasses
- H10W 40/257: {having a heterogeneous or anisotropic structure, e.g. powder or fibres in a matrix, wire mesh or porous structures (H10W40/254, H10W40/251 take precedence)}
- H10W 40/47: by flowing liquids, e.g. forced water cooling
- H10W 72/07651: {characterised by changes in properties of the strap connectors during connecting}
- H10W 72/60: Strap connectors, e.g. thick copper clips for grounding of power devices
- H10W 74/00: Encapsulations, e.g. protective coatings
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10

## Abstract

The invention relates to an electronic module (6), in particular a power module, having at least one electrical/electronic component (7) and having a housing (8), which at least partly extends around the component (7), wherein the housing (8) is made of cement composite (1), and wherein the cement composite (1) has at least one particulate filler (2). According to the invention, the particulate filler (2) has aluminum nitride particles (3), which each have a coating only of aluminum oxide (4).

## Claims

### Claim 1

An electronic module (6) having at least one electrical/electronic component (7) and having a housing (8) that at least partly surrounds the component (7), wherein the housing (8) is manufactured from cement composite (1), and wherein the cement composite (1) includes cement (18) and at least one particulate filler (2), wherein the particulate filler (2) includes aluminum nitride particles (3) each having a coating solely of alumina (4), and wherein a heat sink (13) in the form of a coolant duct (15) extends through the cement composite (1) such that sections of a longitudinal extent of the coolant duct are surrounded completely by the cement composite (1).

### Claim 2 (depends on 1)

The electronic module as claimed in claim 1, characterized in that the filler (2) is distributed homogeneously in the cement composite (1).

### Claim 3 (depends on 1)

The electronic module as claimed in claim 1, characterized in that the filler (2) is a granular material or powder.

### Claim 4 (depends on 1)

The electronic module as claimed in claim 1, characterized in that the cement (18) is manufactured from inorganic material.

### Claim 5 (depends on 1)

The electronic module as claimed in claim 1, characterized in that the cement composite contains at least one further filler (5).

### Claim 6 (depends on 5)

The electronic module as claimed in claim 5, wherein the at least one further filler (5) includes nitridic ceramic particles or SiC particles.

### Claim 7

A process for producing an electronic module (6), comprising the following steps:
providing at least one electrical/electronic component (7),
providing a cement (18),
providing aluminum nitride particles (3),
providing the respective aluminum nitride particles (3) with a coating solely of alumina (4),
introducing the aluminum nitride particles (3) provided with a coating solely of alumina (4) into the cement (18) for production of a cement composite (1),
providing a heat sink (13) in the form of a coolant duct (15), and
at least partly encapsulating the electrical/electronic component (7) and the heat sink (13) with the cement composite (1) to produce a housing (10), the heat sink (13) being encapsulated such that sections of a longitudinal extent of the coolant duct (15) are surrounded completely by the cement composite (1).

### Claim 8 (depends on 7)

The process as claimed in claim 7, characterized in that the aluminum nitride particles (3) are provided with a coating solely of alumina (4) by oxidizing the aluminum nitride particles (3).

### Claim 9 (depends on 7)

The process as claimed in claim 7, characterized in that the aluminum nitride particles (3) are provided with a coating solely of alumina (4) by applying the alumina (4) to the aluminum nitride particles (3) with a deposition process.

### Claim 10 (depends on 7)

The process as claimed in claim 7, further comprising introducing at least one further filler (5) into the cement (18) for production of the cement composite (1).

### Claim 11 (depends on 10)

The process as claimed in claim 10, wherein the at least one further filler (5) includes nitridic ceramic particles or SiC particles.