CN-121986560-A - Power electronic cooler, power device and inverter

Abstract

An insert plate (EP) has a channel opening (BO, TO) for introducing part of the coolant directly from the flow channel section (ZF) into the return channel section (RF), and a temperature control Valve (VT) is provided at the channel opening (BO, TO) which is arranged TO block or release the flow of coolant through the channel opening depending on the temperature of the coolant in the flow channel section (ZF) and/or the return channel section (RF). The invention also relates to a power device and an inverter with the cooler.

Inventors

• Youssef Salehi
• FETZER JOHANNES
• Alexander. Shaolman
• FLORIAN STAUB

Assignees

• 舍弗勒技术股份两合公司

Dates

Publication Date

20260505

Application Date

20241108

Priority Date

20231117

Claims (10)

1. 1. A power electronic cooler (KL) for cooling a power device (LV), characterized by comprising: A Base Plate (BP) and a cover plate (DP), which together enclose a cooling channel (KN) for conducting a cooling fluid, which cooling channel extends in the longitudinal direction (LR) of the cooler (KL); a coolant inlet (EL) and a coolant outlet (AL) which are arranged at a first longitudinal end (E1) of the cooling channel (KN) in the longitudinal direction (LR); An insert plate (EP) which is arranged between the Bottom Plate (BP) and the cover plate (DP) in the cooling channel (KN) and separates the cooling channel (KN) into a flow-supply channel section (ZF) extending from the cooling-liquid inlet (EL) to a second longitudinal end (E2) opposite the first longitudinal end (E1), and a return channel section (RF) extending from the second longitudinal end (E2) to the cooling-liquid outlet (AL); wherein the insert plate (EP) encloses the flow channel section (ZF) together with the Base Plate (BP) and the return channel section (RF) together with the cover plate (DP); wherein the insert plate (EP) is provided with a flow guide (DO) at the second longitudinal end (E2) for guiding the cooling liquid from the supply channel section (ZF) to the return channel section (RF); Wherein the insert plate (EP) is further provided with a bypass/dead water opening (BO, TO) for introducing part of the cooling liquid directly from the supply channel section (ZF) directly into the return channel section (RF); Wherein the insert plate (EP) is provided with a temperature control Valve (VT) at the bypass/dead water opening (BO, TO) configured TO block or release the flow of cooling liquid through said opening depending on the temperature of the cooling liquid in the supply channel section (ZF) and/or the return channel section (RF).
2. 2. The cooler (KL) according to claim 1, characterized in that the bypass opening is a Bypass Opening (BO) for introducing part of the cooling liquid from the supply channel section (ZF) directly into the return channel section (RF) without going through a flow guiding opening (DO).
3. 3. The cooler (KL) according TO claim 1 or 2, characterised in that the bypass opening is a dead water opening (TO) for introducing part of the cooling liquid from the supply channel section (ZF) directly into the dead water zone (TG) of the return channel section (RF).
4. 4. The cooler (KL) according to any one of the preceding claims, characterised in that the Valve (VT) is a diaphragm valve.
5. 5. The cooler (KL) according to any one of the preceding claims, characterised in that the Valve (VT) is a bimetallic valve.
6. 6. The cooler (KL) according to any one of the preceding claims, characterized in that the valve is further configured to block or release the flow of cooling liquid through the bypass opening according to a temperature difference of the cooling liquid in the supply channel section (ZF) and the return channel section (RF).
7. 7. The cooler (KL) according to any one of the preceding claims, characterized in that the valve is further configured to block or release the flow of cooling liquid through the bypass opening in dependence of the local cooling liquid temperature around the supply channel section (ZF) and/or the return channel section (RF) and the bypass opening and/or the temperature difference between these local cooling liquid temperatures.
8. 8. The cooler (KL) according to any one of the preceding claims, characterized in that the valve is further configured to control or regulate the flow of coolant through the bypass opening in dependence of the coolant temperatures in the supply channel section (ZF) and the return channel section (RF) and/or the temperature difference between these coolant temperatures, without releasing, partially releasing or completely releasing the coolant flow through the bypass opening.
9. 9. A power device (LV), characterized by comprising: a power module (LM); The cooler (KL) according to any one of the preceding claims; wherein the power module (LM) is disposed on a surface (OF) OF the cover plate (DP) remote from the return path section (RF) and in thermal contact with the cover plate (DP).
10. 10. An inverter is provided, which comprises a first inverter and a second inverter, characterized by comprising the following steps: The power device (LV) according to claim 9; a drive circuit for driving the power device (LV), which drive circuit is electrically connected to the power module (LM) by means of a signal connection.

Description

Power electronic cooler, power device and inverter Technical Field The present invention relates to a power electronic cooler, or a cooler for cooling a power device, for example for a DCDC converter or inverter, in particular for the electric drive of a motor vehicle. The invention also relates to a power device with the cooler and an inverter with the power device. Prior art and objects of the invention Power electronic coolers for cooling power devices are known and are used in (power) DCDC converters or (power) inverters, for example in electrically driven vehicles, for cooling power devices or power modules (with a plurality of power semiconductor switches or with comparable circuit components with high loss power) of DCDC converters or inverters. For example, in a so-called EPF2.3 inverter (product of Vitesco Technologies GmbH company), a cooler is used to cool the power device of the inverter and its power modules (having a plurality of power semiconductor switches). For such coolers, due to the circuit design characteristics of the power device or its power module, a requirement for uniform cooling is placed on the power device or its power module (as well as all power semiconductor switches or all comparable circuit components with high loss power). This prevents local high temperature spikes (english "High temperature spikes") from occurring at the power plant or at its power modules, which could otherwise lead to performance degradation, malfunctions or even failure of the power plant or the inverter, or at least to a reduction in its service life. It is therefore an object of the present application to provide a solution enabling a power device (e.g. of an inverter or a DCDC converter) and its power module (with a plurality of power semiconductor switches or a comparable circuit assembly with high loss power) to be cooled uniformly. Disclosure of Invention The above object is achieved by the subject matter of the independent claims. Preferred embodiments are the subject matter of the dependent claims. According to a first aspect of the invention, a power electronics cooler, or a cooler for cooling a power device, for example for a DCDC converter or inverter, in particular for an electrically driven vehicle, is provided. The cooler has a base plate and a cover plate which together (at least partially) enclose a cooling channel which extends in the longitudinal direction of the cooler and is used for the flow of a cooling liquid, for example cooling water. The cooler also has a coolant inlet (english "inlet") and a coolant outlet (english "outlet") which are arranged in the longitudinal direction at a first longitudinal end of the cooling channels (in particular juxtaposed to one another so as to lie one behind the other in the transverse direction of the cooler). The cooler also has an insert plate disposed within the cooling channel between the base plate and the cover plate and separating the cooling channel into (at least) a supply channel section extending from the cooling fluid inlet to a second longitudinal end opposite the first longitudinal end, and (at least) a return channel section extending from the second longitudinal end of the cooling channel to the cooling fluid outlet. Meanwhile, the insert plate encloses the flow-supplying channel section (at least partially, or in addition to the openings to be described below) together with the bottom plate, and encloses the return channel section (at least partially, or in addition to the openings to be described below) together with the cover plate. The insert plate has at the second longitudinal end (at least) one flow guiding opening (or flow guiding recess, i.e. a lateral cut-out in the insert plate) arranged for guiding the cooling liquid from the flow channel section to the return channel section. Through the diversion port, the supply channel section is in fluid series communication with the return channel section. The insert plate furthermore has a channel opening between the coolant inlet and the flow guide opening, i.e. between the first and the second longitudinal end of the cooling channel, for guiding part of the coolant from the flow channel section directly, i.e. without flowing through the flow guide opening, to the return channel section. Furthermore, the insert plate is provided with a temperature control valve at the channel opening, which is arranged to control and/or regulate the flow of cooling liquid through the channel opening, i.e. to (completely) block or (partially or completely) release the flow through the channel opening, depending on the temperature of the cooling liquid in the supply channel section and/or the return channel section. The cover plate, the insert plate and the base plate can each be formed by a substantially plate-shaped cooler component with correspondingly shaped side portions, which together enclose the cooling channel (except for the coolant inlet and the coolant outlet) in a fluid-tight mann