Insulation device between positive electrode and negative electrode of IGBT

Abstract

The utility model discloses an insulation device between positive and negative electrodes of an IGBT, which improves the electrical safety of insulation and voltage resistance of a controller by improving the electrical gap between the positive and negative electrodes of an IGBT module, has a simple structure, is convenient to produce, install and assemble in a buckling manner, is installed on a fixing screw of a capacitor, is simple in structure, accurate in positioning, light and small in structure, and reduces the vibration influence. And the manufacturing cost is reduced, and batch production is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of power devices, in particular to an insulation device between positive and negative electrodes of an IGBT. Background Art

[0002] New energy vehicles have developed rapidly in recent years, and their technologies are constantly evolving. In the early stages of the industry's development, the voltage platform for complete vehicles was around 400VDC, resulting in relatively slow charging speeds at the same current. Currently, to increase charging speeds, the industry trend is raising the voltage platform to 800VDC. This increase in voltage requires corresponding increases in the clearance and creepage distances of related electronic components. The drive motor controller is a key component for controlling the vehicle's drive motor, and the IBGT within the controller is one of the most critical electronic components.

[0003] Data indicates that with the development of the industry, several major package types have emerged, including HPD, HP1, TPAK, and DSB. The currently popular HPD packaged IGBT was originally developed for the 400VDC platform and presents potential electrical clearance hazards when used on the 800VDC platform. This structure improves the electrical clearance between the positive and negative terminals of the IGBT module, enhancing the insulation and withstand voltage safety of the controller.

[0004] Chinese patent document CN219018664U discloses a "capacitor busbar connection structure for a motor controller and a motor controller". It includes a power module and a capacitor, and the power module and the capacitor are connected via a copper busbar; the power module includes a plurality of phase terminals, and the terminal includes a positive terminal and a negative terminal; the copper busbar includes a positive copper busbar and a negative copper busbar, the positive copper busbar is connected to the positive terminal of the power module, and the negative copper busbar is connected to the negative terminal of the power module; it also includes a support base, the support base is provided at the bottom of the terminal, and the copper busbar is provided between the terminal and the support base, and is provided on the side of the support base close to the power module. The above technical solution lacks a solution to the insulation problem between the positive and negative poles of the capacitor. Summary of the Invention

[0005] The utility model mainly solves the technical problem that the original technical solution lacks the treatment of the insulation problem between the positive and negative poles of the capacitor, and provides an insulation device between the positive and negative poles of the IGBT. By improving the electrical gap between the positive and negative poles of the IGBT module, the insulation and voltage resistance of the controller are increased. The utility model has a simple structure and a snap-on form, which is convenient for production, installation and assembly operations. It is installed on the fixing screws of the capacitor. It has a simple structure, accurate positioning, and a light structure, which reduces the impact of vibration and reduces manufacturing costs, and is conducive to mass production.

[0006] The above-mentioned technical problems of the present invention are mainly solved by the following technical solution: the present invention includes a capacitor positive copper bar and a capacitor negative copper bar arranged side by side, and also includes an IGBT positive copper bar and an IGBT negative copper bar arranged side by side, the capacitor positive copper bar is connected to the IGBT positive copper bar, and the capacitor negative copper bar is connected to the IGBT negative copper bar. By improving the electrical gap between the positive and negative poles of the IGBT module, the insulation and withstand voltage electrical safety of the controller are increased. The structure is simple and the clip-on form facilitates production, installation and assembly operations. It is installed on the fixing screws of the capacitor, has a simple structure, accurate positioning, and a light and compact structure, which reduces the impact of vibration and reduces manufacturing costs, facilitating mass production.

[0007] Preferably, an insulating sheet is provided between the capacitor positive copper bar and the capacitor negative copper bar, and an insulating sheet is provided between the IGBT positive copper bar and the IGBT negative copper bar. A capacitor copper bar support sheet is vertically provided between the capacitor positive copper bar and the capacitor negative copper bar, and the capacitor copper bar support sheet isolates and increases the electrical gap between the capacitor positive copper bar and the capacitor negative copper bar, and also isolates and increases the electrical gap between the IGBT positive copper bar and the IGBT negative copper bar.

[0008] Preferably, the capacitor positive copper bar is connected to the IGBT positive copper bar via bolts, and the capacitor negative copper bar is connected to the IGBT negative copper bar via bolts.

[0009] Preferably, the capacitor copper bar is provided with a capacitor copper bar pressure rivet nut, and a heat dissipation water channel is provided next to the capacitor copper bar pressure rivet nut. The capacitor copper bar pressure rivet nut is fixed to the capacitor copper bar by pressure riveting.

[0010] Preferably, an insulating sheet is provided between the capacitor copper bar press rivet nut and the heat dissipation channel. The insulating sheet is made of plastic and has excellent insulation and voltage resistance. A heat dissipation channel support sheet is provided between the capacitor copper bar press rivet nut and the heat dissipation channel. The support sheet is arranged vertically and effectively isolates and increases the electrical clearance between the capacitor copper bar press rivet nut and the heat dissipation channel.

[0011] Preferably, the insulating sheet includes a supporting sheet and two sets of clips arranged in parallel on the supporting sheet, and the two sets of clips are respectively clipped with the capacitor copper bar pressure rivet nuts of the capacitor positive copper bar and the capacitor copper bar pressure rivet nuts of the capacitor negative copper bar. The support plate includes a vertically arranged capacitor copper bar support plate and a heat dissipation water channel support plate. The vertically arranged capacitor copper bar support plate and the heat dissipation water channel support plate form a T shape as a whole. The capacitor copper bar support plate is vertically connected to the middle of the heat dissipation water channel support plate. The capacitor copper bar support plate divides the heat dissipation water channel support plate into two parts, left and right. The heat dissipation water channel support plates of the left and right parts are respectively provided with a group of clips. The clips are annular structures parallel to the capacitor copper bar. There are two clips in a group. The two clips in the same group overlap in the vertical direction, and the clip diameter is adapted to the capacitor copper bar pressure rivet nut. Therefore, the two groups of clips on an insulating sheet can be respectively connected to the capacitor copper bar pressure rivet nut of the adjacent capacitor positive copper bar and the capacitor copper bar pressure rivet nut of the capacitor negative copper bar, and fixed to the positive and negative capacitor copper bar pressure rivet nuts at the same time. In this way, the positioning is accurate and does not shake or fall off. In addition, a notch is provided at one end of the clip close to the capacitor copper bar pressure rivet nut, which is convenient for fixing the insulating sheet to the positive and negative capacitor copper bar pressure rivet nuts at the same time.

[0012] Preferably, the support plate includes a vertically arranged capacitor copper busbar support plate and a heat dissipation channel support plate, wherein the connection between the capacitor copper busbar support plate and the heat dissipation channel support plate is provided with a reinforcing rib. The vertically arranged capacitor copper busbar support plate and the heat dissipation channel support plate form a T-shape as a whole, wherein the capacitor copper busbar support plate is vertically connected to the middle of the heat dissipation channel support plate, and the capacitor copper busbar support plate divides the heat dissipation channel support plate into left and right parts. The connection between the left and right parts of the capacitor copper busbar support plate and the heat dissipation channel support plate is respectively provided with a connecting rib, which can increase the connection stability and support strength of the capacitor copper busbar support plate and the heat dissipation channel support plate to a limited extent.

[0013] Preferably, the capacitor copper bar support plate is disposed between the positive capacitor copper bar and the negative capacitor copper bar, with a notch provided below the capacitor copper bar support plate. The capacitor copper bar support plate is vertically disposed between the positive capacitor copper bar and the negative capacitor copper bar, isolating and increasing the electrical clearance between the positive capacitor copper bar and the negative capacitor copper bar, as well as between the positive IGBT copper bar and the negative IGBT copper bar. Furthermore, a notch is provided below the capacitor copper bar support plate near the base plate, which effectively enables internal air circulation and facilitates heat dissipation.

[0014] The beneficial effects of the utility model are: by improving the electrical gap between the positive and negative poles of the IGBT module, the insulation and voltage resistance of the controller are increased; the structure is simple, and the snap-on form facilitates production, installation, and assembly operations; it is installed on the fixing screws of the capacitor; the structure is simple, the positioning is accurate, the structure is light, and the vibration effect is reduced, and the manufacturing cost is reduced, which is conducive to mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0016] Figure 2 It is an exploded view of the present utility model.

[0017] In the figure, 1 is the capacitor positive copper busbar, 2 is the capacitor negative copper busbar, 3 is the insulation sheet, 4 is the heat dissipation channel, 5 is the IGBT positive copper busbar, 6 is the IGBT negative copper busbar, 7 is the capacitor copper busbar rivet nut, and 8 is the bolt. DETAILED DESCRIPTION

[0018] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the technical solutions of the present invention are further described in detail below through embodiments and in combination with the accompanying drawings. It should be understood that the specific implementation method described here is only an optimal embodiment of the present invention, which is only used to explain the present invention and does not limit the scope of protection of the present invention. All other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0019] New energy vehicles have developed rapidly in recent years, and their technologies are constantly evolving. In the early stages of the industry's development, the voltage platform for vehicles was around 400VDC, resulting in relatively slow charging speeds at the same current. Currently, to increase charging speeds, the industry trend is raising the voltage platform to 800VDC. This increase in voltage requires corresponding increases in the electrical clearances and creepage distances of related electronic components. The drive motor controller is a key component for controlling the vehicle's drive motor, and the IGBT within the controller is one of the most important electronic components. With the development of the industry, several major packaging types have emerged, including HPD, HP1, TPAK, and DSB. The widely used HPD packaged IGBT was originally developed for the 400VDC platform, and its electrical clearance poses a risk when used on the 800VDC platform. This design improves the electrical clearance between the positive and negative terminals of the IGBT module, enhancing the controller's insulation and withstand voltage electrical safety.

[0020] Before discussing the exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flow charts. Although the flow charts describe the operations (or steps) as sequential processes, many of the operations (or steps) therein can be performed in parallel, concurrently, or simultaneously. In addition, the order of the operations can be rearranged. The process can be terminated when its operations are completed, but can also have additional steps not included in the figures; the process can correspond to a method, function, procedure, subroutine, subprogram, etc.

[0021] The technical solution of the present invention will be further specifically described below with reference to embodiments and in conjunction with the accompanying drawings.

[0022] Embodiment: An insulating device between the positive and negative electrodes of an IGBT according to this embodiment, such as Figure 1 and Figure 2 As shown, it includes a capacitor positive copper bar 1 and a capacitor negative copper bar 2 arranged side by side, and also includes an IGBT positive copper bar 5 and an IGBT negative copper bar 6 arranged side by side. The capacitor positive copper bar 1 is connected to the IGBT positive copper bar 5, and the capacitor negative copper bar 2 is connected to the IGBT negative copper bar 6. The capacitor positive copper bar 1 is connected to the IGBT positive copper bar 5 by bolts 8, and the capacitor negative copper bar 2 is connected to the IGBT negative copper bar 6 by bolts 8. By improving the electrical gap between the positive and negative poles of the IGBT module, the insulation and withstand voltage electrical safety of the controller are increased. The structure is simple and the snap-on form facilitates production, installation and assembly operations. It is installed on the fixing screws of the capacitor. It has a simple structure, accurate positioning, a light structure, reduces the impact of vibration, and reduces manufacturing costs, which is conducive to mass production.

[0023] An insulating sheet 3 is provided between the capacitor positive copper bar 1 and the capacitor negative copper bar 2, and an insulating sheet is provided between the IGBT positive copper bar 5 and the IGBT negative copper bar 6. A capacitor copper bar support sheet is provided vertically between the capacitor positive copper bar 1 and the capacitor negative copper bar 2. The capacitor copper bar support sheet isolates and increases the electrical gap between the capacitor positive copper bar 1 and the capacitor negative copper bar 2, and also isolates and increases the electrical gap between the IGBT positive copper bar 5 and the IGBT negative copper bar 6.

[0024] A capacitor copper bar is provided with a capacitor copper bar press rivet nut 7, and a heat dissipation channel is provided next to the capacitor copper bar press rivet nut 7. The capacitor copper bar press rivet nut is fixed to the capacitor copper bar by press riveting. An insulating sheet is provided between the capacitor copper bar press rivet nut 7 and the heat dissipation channel 4. The insulating sheet is made of plastic and has excellent insulation and voltage resistance. A heat dissipation channel support sheet is provided between the capacitor copper bar press rivet nut 7 and the heat dissipation channel 4. The heat dissipation channel support sheet is arranged vertically and can effectively isolate and increase the electrical clearance between the capacitor copper bar press rivet nut 7 and the heat dissipation channel 4.

[0025] The insulating sheet 3 includes a supporting sheet and two sets of buckles arranged in parallel on the supporting sheet, and the two sets of buckles are respectively clamped with the capacitor copper bar pressure rivet nuts 7 of the capacitor positive copper bar 1 and the capacitor copper bar pressure rivet nuts 7 of the capacitor negative copper bar 2. The support plate includes a vertically arranged capacitor copper bar support plate and a heat dissipation water channel support plate. The vertically arranged capacitor copper bar support plate and the heat dissipation water channel support plate form a T shape as a whole. The capacitor copper bar support plate is vertically connected to the middle of the heat dissipation water channel support plate. The capacitor copper bar support plate divides the heat dissipation water channel support plate into two parts, left and right. The heat dissipation water channel support plates of the left and right parts are respectively provided with a group of clips. The clips are annular structures parallel to the capacitor copper bar. There are two clips in a group. The two clips in the same group overlap in the vertical direction, and the clip diameter is adapted to the capacitor copper bar pressure rivet nut 7. Therefore, the two groups of clips on an insulating sheet 3 can be respectively connected to the capacitor copper bar pressure rivet nut 7 of the adjacent capacitor positive copper bar 1 and the capacitor copper bar pressure rivet nut 7 of the capacitor negative copper bar 2, and fixed to the positive and negative capacitor copper bar pressure rivet nuts at the same time. In this way, the positioning is accurate and does not shake or fall off. In addition, a notch is provided at one end of the clip close to the capacitor copper bar pressure rivet nut 7, which is convenient for fixing the insulating sheet 3 to the positive and negative capacitor copper bar pressure rivet nuts at the same time.

[0026] The support plate includes a vertically arranged capacitor copper busbar support plate and a heat dissipation channel support plate. The connection between the capacitor copper busbar support plate and the heat dissipation channel support plate is provided with reinforcing ribs. The vertically arranged capacitor copper busbar support plate and the heat dissipation channel support plate form a T-shape as a whole. The capacitor copper busbar support plate is vertically connected to the center of the heat dissipation channel support plate, and the capacitor copper busbar support plate divides the heat dissipation channel support plate into left and right parts. The left and right connection parts of the capacitor copper busbar support plate and the heat dissipation channel support plate are respectively provided with connecting ribs. The connecting ribs can increase the connection stability and support strength of the capacitor copper busbar support plate and the heat dissipation channel support plate to a limited extent.

[0027] The capacitor busbar support plate is positioned between the positive and negative capacitor busbars 1 and 2, with a notch below. This plate is vertically positioned between the positive and negative capacitor busbars 1 and 2, isolating and increasing the electrical clearance between the positive and negative capacitor busbars 1 and 2, as well as between the positive and negative IGBT busbars 5 and 6. A notch is also positioned below the plate near the baseplate to effectively facilitate internal air circulation and heat dissipation.

[0028] For example, see Figure 1 and Figure 2

[0029] The positive copper bar of the capacitor and the positive copper bar of the IGBT, and the negative copper bar of the capacitor and the negative copper bar of the 6IGBT are connected by bolts.

[0030] The insulating sheet of the present invention is used for isolating and increasing the electrical gap between the positive copper bar of the capacitor and the negative copper bar of the capacitor, and between the positive copper bar of the IGBT and the negative copper bar of the IGBT.

[0031] The capacitor busbar rivet nut is secured to the capacitor busbar by pressure riveting. The insulating sheet is used to isolate and increase the electrical clearance between the heat dissipation channel and the capacitor busbar rivet nut. The insulating sheet has two sets of clips that simultaneously secure to the positive and negative terminals of the capacitor busbar rivet nut, ensuring precise positioning and preventing loosening or falling off. The insulating sheet's snap-fit ​​mechanism secures it to the capacitor busbar rivet nut, resulting in a simple structure and convenient production operations.

[0032] The insulating sheet 3 includes a supporting sheet and two sets of buckles arranged in parallel on the supporting sheet, and the two sets of buckles are respectively clamped with the capacitor copper bar pressure rivet nuts 7 of the capacitor positive copper bar 1 and the capacitor copper bar pressure rivet nuts 7 of the capacitor negative copper bar 2. The support plate includes a vertically arranged capacitor copper bar support plate and a heat dissipation water channel support plate. The vertically arranged capacitor copper bar support plate and the heat dissipation water channel support plate form a T shape as a whole. The capacitor copper bar support plate is vertically connected to the middle of the heat dissipation water channel support plate. The capacitor copper bar support plate divides the heat dissipation water channel support plate into two parts, left and right. The heat dissipation water channel support plates of the left and right parts are respectively provided with a group of clips. The clips are annular structures parallel to the capacitor copper bar. There are two clips in a group. The two clips in the same group overlap in the vertical direction, and the clip diameter is adapted to the capacitor copper bar pressure rivet nut 7. Therefore, the two groups of clips on an insulating sheet 3 can be respectively connected to the capacitor copper bar pressure rivet nut 7 of the adjacent capacitor positive copper bar 1 and the capacitor copper bar pressure rivet nut 7 of the capacitor negative copper bar 2, and fixed to the positive and negative capacitor copper bar pressure rivet nuts at the same time. In this way, the positioning is accurate and does not shake or fall off. In addition, a notch is provided at one end of the clip close to the capacitor copper bar pressure rivet nut 7, which is convenient for fixing the insulating sheet 3 to the positive and negative capacitor copper bar pressure rivet nuts at the same time. The insulating sheet of the present invention is made of plastic material and has good insulation and voltage resistance performance.

[0033] The support plate includes a vertically arranged capacitor copper busbar support plate and a heat dissipation channel support plate. The connection between the capacitor copper busbar support plate and the heat dissipation channel support plate is provided with reinforcing ribs. The vertically arranged capacitor copper busbar support plate and the heat dissipation channel support plate form a T-shape as a whole. The capacitor copper busbar support plate is vertically connected to the center of the heat dissipation channel support plate, and the capacitor copper busbar support plate divides the heat dissipation channel support plate into left and right parts. The left and right connection parts of the capacitor copper busbar support plate and the heat dissipation channel support plate are respectively provided with connecting ribs. The connecting ribs can increase the connection stability and support strength of the capacitor copper busbar support plate and the heat dissipation channel support plate to a limited extent.

[0034] The specific embodiments described herein are merely examples of the spirit of the present invention. The above embodiments only express several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that technicians in the technical field to which the present invention belongs can make various modifications or supplements to the described specific embodiments or replace them in a similar manner, but they will not deviate from the spirit of the present invention or exceed the scope defined by the attached claims. For ordinary technicians in this field, multiple variations and improvements can be made without departing from the concept of the present invention. Therefore, the scope of protection of the patent of the present invention should be based on the attached claims.

Claims

1. An insulation device between the positive and negative electrodes of an IGBT, characterized in that: The invention comprises a capacitor positive copper bar (1) and a capacitor negative copper bar (2) arranged side by side, and also comprises an IGBT positive copper bar (5) and an IGBT negative copper bar (6) arranged side by side, wherein the capacitor positive copper bar (1) is connected to the IGBT positive copper bar (5), and the capacitor negative copper bar (2) is connected to the IGBT negative copper bar (6); an insulating sheet (3) is provided between the capacitor positive copper bar (1) and the capacitor negative copper bar (2), and an insulating sheet (3) is provided between the IGBT positive copper bar (5) and the IGBT negative copper bar (6); the insulating sheet (3) comprises a supporting sheet and two groups of buckles arranged in parallel on the supporting sheet, and the two groups of buckles are respectively clamped with the capacitor copper bar pressure rivet nut (7) of the capacitor positive copper bar and the capacitor copper bar pressure rivet nut (7) of the capacitor negative copper bar.

2. The insulating device between the positive and negative electrodes of an IGBT according to claim 1, characterized in that: The capacitor positive copper busbar (1) is connected to the IGBT positive copper busbar (5) via bolts (8), and the capacitor negative copper busbar (2) is connected to the IGBT negative copper busbar (6) via bolts (8).

3. The insulating device between the positive and negative electrodes of an IGBT according to claim 2, characterized in that: The capacitor copper bar is provided with a capacitor copper bar pressure rivet nut (7), and a heat dissipation water channel (4) is provided beside the capacitor copper bar pressure rivet nut (7).

4. The insulating device between the positive and negative electrodes of an IGBT according to claim 3, characterized in that: An insulating sheet (3) is provided between the capacitor copper bar pressure rivet nut (7) and the heat dissipation water channel (4).

5. The insulating device between the positive and negative electrodes of an IGBT according to claim 2 or 4, characterized in that: The insulating sheet (3) comprises a supporting sheet and two sets of buckles arranged in parallel on the supporting sheet, wherein the two sets of buckles are respectively engaged with the capacitor copper bar pressure rivet nuts (7) of the capacitor positive copper bar (1) and the capacitor copper bar pressure rivet nuts (7) of the capacitor negative copper bar (2).

6. The insulating device between the positive and negative electrodes of an IGBT according to claim 5, characterized in that: The support plate includes a capacitor copper bar support plate and a heat dissipation water channel support plate that are vertically arranged, and a reinforcing rib is provided at the connection between the capacitor copper bar support plate and the heat dissipation water channel support plate.

7. The insulating device between the positive and negative electrodes of an IGBT according to claim 6, characterized in that: The capacitor copper bar support sheet is arranged between the capacitor positive copper bar (1) and the capacitor negative copper bar (2), and a notch is provided below the capacitor copper bar support sheet.

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