New energy automobile power module structure
By adopting a stacked DC positive and negative terminal structure and auxiliary carrier board design in the power module of new energy vehicles, combined with reasonable connection technology, the problems of stray inductance and poor heat dissipation are solved, thereby reducing stray inductance and improving heat dissipation efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-20
- Publication Date
- 2026-03-10
AI Technical Summary
The terminal structure of existing power modules for new energy vehicles results in problems such as large stray inductance and poor heat dissipation.
The structure employs a stacked DC positive and negative terminal structure, and increases the welding area through an auxiliary carrier board. Combined with connection processes such as laser welding, the current loop area is reduced and the heat dissipation efficiency is improved.
It significantly reduces stray inductance and improves the heat dissipation efficiency of power terminals.
Smart Images
Figure CN223986726U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to power module structure technical field, concretely relates to a new energy automobile power module structure of reducing stray inductance, enhancement auxiliary heat dissipation. BACKGROUND
[0002] The connection mode of the new energy automobile power module and the inverter current busbar in the market at present is: bolt connection or welding (laser welding, resistance welding etc.). The terminal structure of the existing half bridge packaged power module refers to Figure 1 and Figure 2 The terminal structure of the full bridge packaged power module refers to Figure 3 and Figure 4 . The current loop area formed by this kind of layout mode is larger, thus larger stray inductance is brought about. The welding area of the terminal of the half bridge packaged power module and the full bridge packaged power module on DBC is smaller, such as Figure 5 and Figure 6 This kind of layout mode leads to poor terminal heat dissipation effect.
[0003] Therefore, in view of the above problems, further improvement is made. INVENTION CONTENTS
[0004] The main purpose of the utility model lies in providing a new energy automobile power module structure, and DC positive and negative terminals adopt up-down stacked structure arrangement, can greatly reduce the current loop area between positive and negative terminals, thereby greatly reducing the stray inductance between power terminals. At the same time, the welding area of DC terminal and DBC can be increased through auxiliary DBC, and the heat dissipation efficiency of power terminal is improved.
[0005] In order to achieve the above purpose, the utility model provides a new energy automobile power module structure, including copper clad ceramic carrier board (DBC), DC terminal module and AC terminal module, the DC terminal module is installed in the first end of the copper clad ceramic carrier board, and the AC terminal module is installed in the second end of the copper clad ceramic carrier board, wherein:
[0006] The first end of the copper clad ceramic carrier board is equipped with auxiliary carrier board (auxiliary DBC), and the auxiliary carrier board is equipped with first mounting position, second mounting position and third mounting position;
[0007] The DC terminal module comprises a first DC+ terminal, a second DC+ terminal, a third DC+ terminal, a first DC- terminal, a second DC- terminal and a third DC- terminal, the first DC+ terminal, the second DC+ terminal and the third DC+ terminal are welded to the copper clad ceramic carrier board respectively; the first DC- terminal is welded to the first mounting position and the first DC- terminal is stacked above (with a distance) the first DC+ terminal, the second DC- terminal is welded to the second mounting position and the second DC- terminal is stacked above (with a distance) the second DC+ terminal, and the third DC- terminal is welded to the third mounting position and the third DC- terminal is stacked above (with a distance) the third DC+ terminal.
[0008] As a further preferred technical solution of the above technical solution, the auxiliary carrier board is fixedly installed on the copper clad ceramic carrier board through a silver paste sintering layer.
[0009] As a further preferred technical solution of the above technical solution, the copper clad ceramic carrier board is provided with a plurality of power chips, and the power chips are electrically connected with the DC terminal module and the AC terminal module respectively through connecting lines.
[0010] As a further preferred technical solution of the above technical solution, the second DC+ terminal is located between the first DC+ terminal and the third DC+ terminal, and the second DC- terminal is located between the first DC- terminal and the third DC- terminal.
[0011] As a further preferred technical solution of the above technical solution, the first DC+ terminal, the second DC+ terminal, the third DC+ terminal, the first DC- terminal, the second DC- terminal and the third DC- terminal are each provided with an integrally formed body, an intermediate portion and a welding portion, the body and the welding portion are located at two ends of the intermediate portion respectively and are bent towards opposite directions (the welding portion is used for welding to the copper clad ceramic carrier board or the auxiliary carrier board). BRIEF DESCRIPTION OF DRAWINGS
[0012] Figures 1-6 is a schematic view of the prior structure.
[0013] Figure 7 is a schematic view of the utility model.
[0014] Figure 8 is a schematic view of the utility model.
[0015] Figure 9 is a schematic view of the utility model.
[0016] The reference signs include: 10, a copper clad ceramic carrier plate; 11, a power chip; 12, a connecting line; 20, a DC terminal module; 21, a first DC+ terminal; 22, a second DC+ terminal; 23, a third DC+ terminal; 24, a first DC- terminal; 25, a second DC- terminal; 26, a third DC- terminal; 27, a body; 28, a middle part; 29, a welding part; 30, an AC terminal module; 40, an auxiliary carrier plate; 41, a first mounting position; 42, a second mounting position; 43, a third mounting position; 44, a silver paste sintering layer. DETAILED DESCRIPTION
[0017] The following description is provided to enable any person skilled in the art to practice the present application. The preferred embodiments described below are only examples of the present application, and other obvious modifications can be made by those skilled in the art. The basic principles defined in the following description can be applied to other embodiments, variations, improvements, equivalents and other technical solutions without departing from the spirit and scope of the present application.
[0018] The utility model discloses a new energy automobile power module structure, below combining preferred embodiment, the specific embodiment of utility model is further described.
[0019] In the embodiments of the present application, those skilled in the art should note that the inverter and the like involved in the present application can be regarded as prior art.
[0020] Preferred embodiment.
[0021] As Figures 7-9 The utility model discloses a new energy automobile power module structure, including copper clad ceramic carrier plate 10 (main DBC), DC terminal module 20 and AC terminal module 30, DC terminal module 20 installs in the first end of copper clad ceramic carrier plate 10 and AC terminal module 30 installs in the second end of copper clad ceramic carrier plate 10, wherein:
[0022] The first end of copper clad ceramic carrier plate 10 is equipped with auxiliary carrier plate 40 (auxiliary DBC), and the auxiliary carrier plate 40 is equipped with first mounting position 41, second mounting position 42 and third mounting position 43.
[0023] The DC terminal module 20 comprises a first DC+ terminal 21, a second DC+ terminal 22, a third DC+ terminal 23, a first DC- terminal 24, a second DC- terminal 25 and a third DC- terminal 26, the first DC+ terminal 21, the second DC+ terminal 22 and the third DC+ terminal 23 are welded to the copper clad ceramic carrier board 10 respectively; the first DC- terminal 24 is welded to the first mounting position 41 and the first DC- terminal 24 is stacked above (with a distance) the first DC+ terminal 21, the second DC- terminal 25 is welded to the second mounting position 42 and the second DC- terminal 25 is stacked above (with a distance) the second DC+ terminal 22, the third DC- terminal 26 is welded to the third mounting position 43 and the third DC- terminal 26 is stacked above (with a distance) the third DC+ terminal 23.
[0024] Specifically, the auxiliary carrier board 40 is fixedly installed on the copper clad ceramic carrier board 10 through a silver paste sintering layer 44.
[0025] More specifically, the copper clad ceramic carrier board 10 is installed with a plurality of power chips 11, and the power chips 11 are electrically connected with the DC terminal module 20 and the AC terminal module 30 respectively through connecting lines 12.
[0026] Further, the second DC+ terminal 22 is located between the first DC+ terminal 21 and the third DC+ terminal 23, and the second DC- terminal 25 is located between the first DC- terminal 24 and the third DC- terminal 26.
[0027] Still further, the first DC+ terminal 21, the second DC+ terminal 22, the third DC+ terminal 23, the first DC- terminal 24, the second DC- terminal 25 and the third DC- terminal 26 are each provided with an integrally formed body 27, an intermediate portion 28 and a welding portion 29, the body 27 and the welding portion 29 are located at two ends of the intermediate portion 28 respectively and are bent towards opposite directions (the welding portion is used for welding to the copper clad ceramic carrier board or the auxiliary carrier board).
[0028] For the utility model:
[0029] A small auxiliary DBC is sintered on the DC terminal side of the structure lower main DBC, three DC+ copper bar terminals are fixed on the main DBC through soldering and the like, three DC- copper bar terminals are fixed on the auxiliary DBC through soldering and the like, and the positive and negative terminals are arranged in an up-down stacking structure, such as Figures 7-9As shown. Outside the module's molding compound, the positive and negative copper busbars are connected to the inverter's current busbars via laser welding, soldering, or bolts. Inside the module, electrical connections between components are achieved through bonding wires, copper strips (or other metal strips), or ultrasonic welding.
[0030] This design adopts a structural layout different from existing solutions. Combined with reasonable connection technology (such as laser welding), it can greatly reduce the area of the current loop where the DC+ copper busbar terminal and the DC- copper busbar terminal are located, thereby greatly reducing the stray inductance generated between the DC+ copper busbar and the DC- copper busbar loop.
[0031] This design adopts a double-layer DBC structure. The upper auxiliary DBC can make full use of the Z-axis space to arrange a larger number of copper busbar terminals. The welding area between the DC copper busbar terminals and the DBC copper foil is larger, which greatly improves the heat dissipation efficiency of the terminals.
[0032] It is worth mentioning that the technical features such as inverters involved in this utility model patent application should be regarded as prior art. The specific structure, working principle, and possible control methods and spatial arrangement of these technical features can be adopted using conventional choices in the field, and should not be regarded as the inventive point of this utility model patent. This utility model patent will not elaborate further.
[0033] For those skilled in the art, modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A new energy vehicle power module structure, characterized in that, The application relates to a DC / AC terminal module, which comprises a copper-clad ceramic carrier plate, a DC terminal module and an AC terminal module, wherein the DC terminal module is mounted on a first end of the copper-clad ceramic carrier plate and the AC terminal module is mounted on a second end of the copper-clad ceramic carrier plate. The first end of the copper-clad ceramic carrier plate is provided with an auxiliary carrier plate, which is provided with a first mounting position, a second mounting position and a third mounting position. The DC terminal module comprises a first DC+ terminal, a second DC+ terminal, a third DC+ terminal, a first DC- terminal, a second DC- terminal and a third DC- terminal, wherein the first DC+ terminal, the second DC+ terminal and the third DC+ terminal are respectively welded to the copper-clad ceramic carrier plate; the first DC- terminal is welded to the first mounting position and is stacked above the first DC+ terminal, the second DC- terminal is welded to the second mounting position and is stacked above the second DC+ terminal, and the third DC- terminal is welded to the third mounting position and is stacked above the third DC+ terminal.
2. The power module structure for a new energy vehicle according to claim 1, characterized in that, The auxiliary carrier plate is fixedly mounted on the copper-clad ceramic carrier plate through a silver paste sintering layer.
3. The power module structure of a new energy vehicle according to claim 1, characterized in that, The copper-clad ceramic carrier plate is mounted with a plurality of power chips, which are respectively electrically connected with the DC terminal module and the AC terminal module through connecting wires.
4. The power module structure of a new energy vehicle according to claim 1, characterized in that, The second DC+ terminal is located between the first DC+ terminal and the third DC+ terminal, and the second DC- terminal is located between the first DC- terminal and the third DC- terminal.
5. The new energy vehicle power module structure according to claim 1, characterized in that, The first DC+ terminal, the second DC+ terminal, the third DC+ terminal, the first DC- terminal, the second DC- terminal and the third DC- terminal are respectively provided with a body, an intermediate part and a welding part, wherein the body and the welding part are respectively located at two ends of the intermediate part and are bent towards opposite directions.