Discrete power module, power electronic system and vehicle

Abstract

The utility model discloses a discrete power module, a power electronic system and a vehicle, and relates to the technical field of electronic devices, the discrete power module comprises a power device, a radiator and a connecting assembly, the radiator is arranged at one side of the power device; the connecting assembly is arranged between the power device and the radiator and connected with the power device and the radiator, the connecting assembly comprises a heat-conducting glue layer, a connecting piece and an insulating piece which are sequentially arranged in the first direction, the heat-conducting glue layer is used for transferring heat of the power device to the radiator, and the insulating piece is used for transferring heat of the power device to the radiator. The connecting part is used for connecting the heat-conducting glue layer and the insulating part, and the insulating part is used for preventing current of the power device from being conducted to the radiator; according to the technical scheme provided by the utility model, the bonding effect between the connecting assemblies can be effectively improved, the layering problem is avoided, and the heat dissipation requirement of the discrete power module is met.

Description

TECHNICAL FIELD

[0001] The utility model relates to electronic device technical field, especially a kind of discrete power module, power electronic system and vehicle. BACKGROUND

[0002] The existing discrete power module package includes at least two parts, which prevents the electrical leakage of the power device charged area by insulating material, and quickly leads the heat generated by the power device to the heat sink by heat-conducting material. The existing common scheme mainly uses heat-conducting glue and heat-conducting insulation sheet that can adapt to tolerance to connect the power device and the heat sink.

[0003] However, the current heat dissipation scheme still has design bottlenecks for high-loss design. After long-term high-temperature aging or temperature impact durability, or long-term use in harsh environments on vehicles, delamination problems may occur between the heat-conducting glue and the insulation part, which cannot meet the heat dissipation requirements of the power device after aging. UTILITY MODEL CONTENT

[0004] The main purpose of the utility model is to provide a discrete power module, power electronic system and vehicle, which aims to solve the problem that delamination may occur between the heat-conducting glue and the insulation part, which cannot meet the heat dissipation requirements of the power device.

[0005] To achieve the above-mentioned purpose, the utility model provides a discrete power module, which comprises:

[0006] a power device;

[0007] a heat sink arranged on one side of the power device; and

[0008] a connecting assembly arranged between the power device and the heat sink and connected with the power device and the heat sink respectively, the connecting assembly comprising a heat-conducting glue layer, a connecting part and an insulation part arranged in sequence along a first direction, the heat-conducting glue layer being used to transfer the heat of the power device to the heat sink, the connecting part being used to connect the heat-conducting glue layer and the insulation part, and the insulation part being used to prevent the conduction of the current of the power device to the heat sink.

[0009] In an embodiment, the heat-conducting glue layer is a heat-conducting silicone gel, which is a single-component silicone gel or a multi-component silicone gel.

[0010] In an embodiment, the surface free energy of the opposite side surface of the connecting part along the first direction is σ1, the surface free energy of one side surface of the heat-conducting glue layer facing the connecting part is σ2, and σ1 is greater than σ2; the surface free energy of one side surface of the insulation part facing the connecting part is σ3, and σ1 is greater than σ3.

[0011] In an embodiment, the connecting piece is a metal sheet or a ceramic sheet.

[0012] And / or, the material of the metal sheet comprises at least one of gold, silver, aluminum and copper.

[0013] In an embodiment, the connecting piece is integrally arranged with the insulating piece;

[0014] Or, the connecting piece is integrally arranged with the heat-conducting glue layer;

[0015] Or, the connecting piece, the insulating piece and the heat-conducting glue layer are integrally arranged.

[0016] In an embodiment, the first direction is from the power device to the heat sink.

[0017] In an embodiment, the first direction is from the heat sink to the power device.

[0018] In an embodiment, the material of the insulating piece is plastic particles or rubber.

[0019] The utility model also provides a kind of power electronic system, including the discrete power module as described in above embodiment.

[0020] The utility model also provides a kind of vehicle, including the power electronic system as described above.

[0021] The technical scheme of the utility model introduces connecting piece, so that the combination strength between connecting piece and insulating piece and connecting piece and heat-conducting glue layer is higher than the combination strength between insulating piece and heat-conducting glue layer, so that connecting assembly can not easily appear delamination after long time high temperature aging or temperature impact durability. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the drawings needed in the embodiment or prior art description will be simply introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to the structure shown in these drawings without creative labor.

[0023] Figure 1 The structure schematic view of one embodiment of the discrete power module provided by the utility model is shown in the drawing.

[0024] Figure 2 The structure schematic view of another embodiment of the discrete power module provided by the utility model is shown in the drawing.

[0025] Explanation of reference numerals:

[0026] 10. Discrete power module; 100. Power device; 200. Connecting assembly; 201. Heat-conducting adhesive layer; 202. Connecting piece; 203. Insulating piece; 300. Heat sink.

[0027] The realization, functional features and advantages of the utility model will be further described in combination with embodiments with reference to the drawings. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0029] It should be noted that if the embodiments of the utility model involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between the components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.

[0030] In addition, if the embodiments of the utility model involve descriptions of "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In addition, "and / or" or "and / or" appearing throughout the text means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B simultaneously satisfy the scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the utility model.

[0031] At present, the scheme of using heat-conducting adhesive and heat-conducting insulating sheet in combination as a connecting assembly of power device and heat sink still has design bottlenecks for high-loss design. After long-time high-temperature aging or temperature impact durability or long-time use in harsh environment vehicles, specifically, use in specific working conditions, the specific working conditions include but are not limited to: high temperature, high humidity, high pressure, stress, etc. The heat-conducting adhesive and insulating piece used in specific working conditions are prone to delamination under the influence of external environment, resulting in that the aged heat-conducting adhesive and insulating piece cannot meet the heat dissipation requirements of the power device.

[0032] The utility model provides a kind of discrete power module.

[0033] Please refer to Figure 1 In the utility model embodiment, the discrete power module includes power device 100, radiator 300 and connecting assembly 200, wherein the radiator 300 is arranged on one side of the power device 100;Connecting assembly 200 is arranged between the power device 100 and the radiator 300, and is connected with the power device 100 and the radiator 300 respectively, the connecting assembly 200 includes heat-conducting adhesive layer 201, connecting piece 202 and insulating piece 203 arranged in sequence along the first direction, the heat-conducting adhesive layer 201 is used to transfer the heat of the power device 100 to the radiator 300, the connecting part is used to connect the heat-conducting adhesive layer 201 and the insulating piece 203, and the insulating part is used to prevent the current of the power device 100 from conducting to the radiator 300.

[0034] The discrete power module 10 in the technical scheme of the utility model includes power device 100, radiator 300 and connecting assembly 200, wherein connecting assembly 200 is arranged between power device 100 and radiator 300, and is connected with power device 100 and radiator 300 respectively. Since at least part of power device 100 is electrified, the current of power device 100 is not prevented from conducting to radiator 300 through connecting assembly 200 to cause leakage, in the embodiment, connecting assembly 200 includes heat-conducting adhesive layer 201, connecting piece 202 and insulating piece 203 arranged in sequence along the first direction, wherein heat-conducting adhesive layer 201 is mainly used to transfer the heat generated during the operation of power device 100 to radiator 300, and discharge the generated heat through radiator 300, and insulating piece 203 is mainly used to prevent the current conducted to radiator 300 by part of power device 100 from leaking, and connecting piece 202 is located between heat-conducting adhesive layer 201 and power device 100, and is connected with heat-conducting adhesive layer 201 and power device 100 respectively. Since connecting piece 202 is added, the bonding strength between connecting piece 202 and insulating piece 203 and the bonding strength between connecting piece 202 and heat-conducting adhesive layer 201 are higher than the bonding strength between insulating piece 203 and heat-conducting adhesive layer 201, so that connecting assembly 200 can not easily have delamination problem after long-time high-temperature aging or temperature shock durability.

[0035] The connecting mode of heat-conducting adhesive layer 201 and power device 100 or radiator 300 can be gluing, and the connecting mode of insulating piece 203 and power device 100 or radiator 300 can also be gluing, which is not limited in detail.

[0036] The heat sink 300 can include, but is not limited to, a metal cooling body, cooling fins, etc.

[0037] In an embodiment, the thermally conductive adhesive layer 201 is a thermally conductive silicone gel, which can be a single-component silicone gel or a multi-component silicone gel. The thermally conductive adhesive layer 201 is a thermally conductive silicone gel. In addition, the discrete power module can be applied to different power electronic systems, and thus the thermally conductive silicone gel can be a single-component silicone gel or a multi-component silicone gel according to the power of the power electronic system. The specific type of the thermally conductive silicone gel is not limited herein.

[0038] In an embodiment, the surface free energy of the opposite side surface of the connecting member 202 along the first direction is σ1, the surface free energy of the side surface of the thermally conductive adhesive layer 201 facing the connecting member 202 is σ2, and the σ1 is greater than the σ2. The surface free energy of the side surface of the insulating member 203 facing the connecting member 202 is σ3, and the σ1 is greater than the σ3. In order to improve the connection effect of the connecting member 202 on the thermally conductive adhesive layer 201 and the insulating member 203, the surface free energy of the connecting member 202 needs to be greater than the surface free energy of the thermally conductive adhesive layer 201 and the insulating member 203. In this way, the connection effect of the connecting member 202 on the thermally conductive adhesive layer 201 and the insulating member 203 can be improved.

[0039] The surface free energy is defined as "the reversible work required to separate a body along an interface against the cohesive forces between the molecules in the body". The work done to overcome the cohesive forces is stored in the form of potential energy on the newly created surface, forming the surface free energy. In general, when two objects are combined, the greater the surface free energy of the adhesive surface of the two objects, the stronger the interaction between the two objects, and the greater the adhesive strength.

[0040] In an embodiment, the connecting member 202 is a metal sheet or a ceramic sheet. In order to enable the connecting member 202 to have the functions described in the above embodiments, the connecting member 202 can be a metal sheet made of metal material or a ceramic sheet made of ceramic material. The metal sheet has a better heat transfer effect than the ceramic sheet, and the ceramic sheet has better insulation performance than the metal sheet. In actual use, different materials can be selected to manufacture the connecting member 202 according to actual needs. The specific material of the connecting member 202 is not limited herein as long as it meets the above conditions.

[0041] In an embodiment, the material of the metal sheet includes at least one of gold, silver, aluminum and copper. Since the metal sheet has a high heat transfer effect, in order to improve the heat dissipation effect of the power device 100 through the heat sink 300, in the embodiment, the connecting piece 202 is made of a metal sheet, and the specific material of the metal sheet can be one of gold, silver, aluminum and copper, or an alloy of two or more of gold, silver, aluminum and copper, and the material of the metal sheet is not limited.

[0042] In an embodiment, the connecting piece 202 is integrally arranged with the insulating piece 203, or the connecting piece 202 is integrally arranged with the heat-conducting glue layer 201, or the connecting piece 202, the insulating piece 203 and the heat-conducting glue layer 201 are integrally arranged. In order to quickly connect and assemble the power device 100 and the heat sink 300 through the connecting assembly 200, in the embodiment, the connecting piece 202 and the insulating piece 203 can be integrally formed by using a common vulcanization method or a hot-pressing method. In another embodiment, the connecting piece 202 and the heat-conducting silicone grease can be integrally formed by using a common vulcanization method or a hot-pressing method. In other embodiments, the connecting piece 202, the insulating piece 203 and the heat-conducting glue layer 201 can be integrally formed by using a common vulcanization method or a hot-pressing method. The connecting assembly 200 arranged in the above manner can quickly connect and assemble the power device 100 and the heat sink 300.

[0043] In an embodiment, as shown in Figure 1 , the first direction is from the power device 100 to the heat sink 300. In the embodiment, the first direction is defined as from the power device 100 to the heat sink 300, that is, the heat-conducting glue layer 201, the connecting piece 202 and the insulating piece 203 are arranged in the direction from the power device 100 to the heat sink 300. This arrangement can better transfer the heat generated by the power device 100 to the heat sink 300.

[0044] In another embodiment, as shown in Figure 2 , the first direction is from the heat sink 300 to the power device 100. Different from the above, the first direction is opposite, and in the embodiment, the first direction is defined as from the heat sink 300 to the power device 100, that is, the heat-conducting glue layer 201, the connecting piece 202 and the insulating piece 203 are arranged in the direction from the heat sink 300 to the power device 100. This arrangement can better prevent the current of the power device 100 from being conducted to the heat sink 300.

[0045] In an embodiment, the insulating member 203 is made of plastic particles or rubber. The insulating member 203 can be made of plastic particles or rubber, or a mixture of plastic particles and rubber. The insulating member 203 can satisfy a good insulation effect, and is not limited in this regard.

[0046] The utility model also provides a kind of power electronic system, and the power electronic system includes discrete power module 10, and the specific structure of the discrete power module 10 refers to above-mentioned embodiment, since the power electronic system of the present application adopts all technical solutions of above-mentioned all embodiments, at least has all beneficial effects brought by the technical solutions of above-mentioned embodiments, and this will not be repeated here one by one.Less elaboration is made to it.

[0047] The power electronic system can be an electric control system and / or a power supply system, which is not limited.

[0048] The utility model also provides a kind of vehicle, and the vehicle includes power electronic system, and the specific structure of the power electronic system refers to above-mentioned embodiment, since the vehicle of the present application adopts all technical solutions of above-mentioned all embodiments, at least has all beneficial effects brought by the technical solutions of above-mentioned embodiments, and this will not be repeated here one by one.Less elaboration is made to it.

[0049] The above-mentioned is only the exemplary embodiment of the utility model, and not therefore limit the patent range of the utility model, is made in the technical concept of the utility model under the utility model specification and attached drawing content, equivalent structure transformation, or direct / indirect application in other related technical fields all include in the patent protection range of the utility model.

Claims

1. A discrete power module, characterized by The utility model relates to a discrete power module, which comprises: a power device; a heat sink arranged on one side of the power device; and a connecting assembly arranged between the power device and the heat sink and connected with the power device and the heat sink respectively, the connecting assembly comprising, in sequence along a first direction, a thermally conductive adhesive layer, a connecting piece and an insulating piece, the thermally conductive adhesive layer being used to transfer heat of the power device to the heat sink, the connecting piece being used to connect the thermally conductive adhesive layer and the insulating piece, and the insulating piece being used to prevent the power device from conducting electric current to the heat sink. A surface free energy of an opposite side surface of the connecting piece along the first direction is σ1, a surface free energy of a side surface of the thermally conductive adhesive layer facing the connecting piece is σ2, and the σ1 is greater than the σ2; a surface free energy of a side surface of the insulating piece facing the connecting piece is σ3, and the σ1 is greater than the σ3. The connecting piece is integrally arranged with the insulating piece, or the connecting piece is integrally arranged with the thermally conductive adhesive layer, or the connecting piece, the insulating piece and the thermally conductive adhesive layer are integrally arranged. The thermally conductive adhesive layer is a thermally conductive silicone gel, and the thermally conductive silicone gel is a single-component silicone gel or a multi-component silicone gel.

2. The discrete power module of claim 1, wherein, The connecting piece is a metal sheet or a ceramic sheet.

3. The discrete power module of claim 2, wherein, The first direction is a direction from the power device to the heat sink.

4. The discrete power module of any one of claims 1 to 3, wherein, The first direction is a direction from the heat sink to the power device.

5. The discrete power module of any one of claims 1 to 3, wherein, The insulating piece is made of plastic particles or rubber.

6. The discrete power module of any one of claims 1 to 3, wherein, The utility model relates to a discrete power module, which comprises:

7. A power electronics system, characterized by a power device; 8. A vehicle characterized by comprising: a heat sink arranged on one side of the power device; and a connecting assembly arranged between the power device and the heat sink and connected with the power device and the heat sink respectively, the connecting assembly comprising, in sequence along a first direction, a thermally conductive adhesive layer, a connecting piece and an insulating piece, the thermally conductive adhesive layer being used to transfer heat of the power device to the heat sink, the connecting piece being used to connect the thermally conductive adhesive layer and the insulating piece, and the insulating piece being used to prevent the power device from conducting electric current to the heat sink. A surface free energy of an opposite side surface of the connecting piece along the first direction is σ1, a surface free energy of a side surface of the thermally conductive adhesive layer facing the connecting piece is σ2, and the σ1 is greater than the σ2; a surface free energy of a side surface of the insulating piece facing the connecting piece is σ3, and the σ1 is greater than the σ3. The connecting piece is integrally arranged with the insulating piece, or the connecting piece is integrally arranged with the thermally conductive adhesive layer, or the connecting piece, the insulating piece and the thermally conductive adhesive layer are integrally arranged. The thermally conductive adhesive layer is a thermally conductive silicone gel, and the thermally conductive silicone gel is a single-component silicone gel or a multi-component silicone gel. The connecting piece is a metal sheet or a ceramic sheet. The first direction is a direction from the power device to the heat sink. The first direction is a direction from the heat sink to the power device. The insulating piece is made of plastic particles or rubber. The utility model relates to a discrete power module, which comprises: a power device; a heat sink arranged on one side of the power device; and a connecting assembly arranged between the power device and the heat sink and connected with the power device and the heat sink respectively, the connecting assembly comprising, in sequence along a first direction, a thermally conductive adhesive layer, a connecting piece and an insulating piece, the thermally conductive adhesive layer being used to transfer heat of the power device to the heat sink, the connecting piece being used to connect the thermally conductive adhesive layer and the insulating piece, and the insulating piece being used to prevent the power device from conducting electric current to the heat sink.

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