CN204315865U - A kind of laminated bus bar structure - Google Patents

Abstract

The utility model discloses a kind of laminated bus bar structure, comprise middle adhesive linkage and represent the positive busbar of two-stage and negative busbar, positive busbar comprises positive plate and positive conducting terminal, negative busbar comprises negative plate and negative conducting terminal, positive plate offers positive master row insulating for coordinating with negative conducting terminal by hole, negative plate offers negative master row insulating for coordinating with positive conducting terminal by hole, positive master row insulating carries out edge sealing insulation by hole and negative master row insulating by being provided with dielectric film in the hole in hole, and the busbar after edge sealing insulation is combined as stack bus bar by middle adhesive linkage.The utility model has simple and compact for structure, easy assembling, effectively can increase the advantages such as creepage distance.

Description

A laminated busbar structure

technical field

The utility model mainly relates to the field of power components, in particular to a laminated busbar structure suitable for power components.

Background technique

Creepage distance refers to the shortest space distance measured along the surface of insulating material between two conductive parts, or between a conductive part and equipment and easy-to-contact surfaces. The distance of discharge along the insulating surface (ie leakage distance) is also called creepage distance , referred to as creep distance, see Figure 1. The shortest creepage distance between conductor A and conductor F is: AB+BC+CD+DE+EF; the minimum slot width X is generally 1-4mm according to different pollution levels; if X≤1-4mm, the distance between conductors It will directly creep, and the shortest creepage distance between conductor A and conductor F is: AF.

Laminated busbars are usually used for the installation of power module components, and the installation terminals of components are often at a certain distance, so it is also necessary to carry out structural design between conductive terminals to increase the creepage distance. As shown in Figure 2 and Figure 3, in order to increase the creepage distance 1 between conductive terminals, some high-power components are provided with insulating grooves 2 for increasing the creepage distance. As shown in Figure 4 and Figure 5, most of the traditional solutions to increase the creepage distance are to install insulating strips 3 on the laminated busbar to increase the creepage distance, that is, to install insulating strips 3 between the conductive terminals to make the creepage between the conductive terminals Path changed. After the insulating strip 3 is added, the second creepage path 105 between the conductive terminals is significantly increased compared with the first creepage path 104 without the insulating strip 3 .

There are inherent disadvantages in the above method: First, adding accessories to the product will inevitably increase the cost, and the material cost and processing cost cannot be ignored. Second, it is difficult for the insulating strip 3 to be attached to the laminated busbar. The insulating strip 3 is usually positioned by tooling, and is bonded to the insulating layer on the surface of the laminated busbar with adhesive glue. Due to the small bonding surface, this form of bonding is not reliable and there is a risk of falling off; 3. Directly use the surface insulation layer to wrap and heat-press the laminated busbar as a whole, but this process requires high mold requirements and high mold costs; moreover, the insulating strip 3 on the laminated busbar needs to be in contact with the insulating groove 2 of the power component. Coordination makes it difficult to assemble laminated busbars.

Utility model content

The technical problem to be solved by the utility model is that: aiming at the technical problems existing in the prior art, the utility model provides a laminated busbar structure with a simple and compact structure, easy assembly, and effective increase of creepage distance.

In order to solve the above technical problems, the utility model adopts the following technical solutions:

A laminated busbar structure comprising an intermediate adhesive layer and positive and negative busbars representing two stages, the positive busbar comprising a positive plate and a positive conductive terminal, the negative busbar comprising a negative plate and a negative conductive terminal , the positive plate is provided with a positive busbar insulation relief hole for matching with the negative conductive terminal, the negative plate is provided with a negative busbar insulation relief hole for matching with the positive conductive terminal, and the positive busbar insulation relief hole The hole and the negative busbar are insulated so that the hole is provided with an insulating film for edge sealing and insulation, and the busbar after edge sealing and insulation is combined into a laminated busbar through the intermediate adhesive layer.

As a further improvement of the utility model: the direction of forming and edge sealing of the insulating film in the hole is from the inside to the outside along the laminated busbar.

As a further improvement of the present utility model: the intermediate adhesive layer is hollowed out between the two poles, and a partitioned cavity is formed between the positive conductive terminal and the negative conductive terminal at the superposition of the insulating holes. The cavity distance is greater than the creepage minimum slot width.

Compared with the prior art, the utility model has the advantages of:

1. The laminated busbar structure of this utility model can increase the creepage distance. This laminated busbar structure is innovatively designed to increase the creepage distance between conductive terminals by improving the structure of the insulating film at the conductive terminals. Compared with the existing laminated busbars, in order to increase the creepage distance, insulating strips or insulating rings are usually installed between the conductive terminals to increase the creepage distance. Creepage distance, simple structure, low cost, solves the problem of insufficient creepage distance between terminals.

2. The laminated busbar structure of this utility model adopts the conventional insulating film edge sealing process of the traditional laminated busbar, only the direction of the edge sealing is changed, and the middle insulating layer is hollowed out at the same time. The process is simple and easy to realize .

3. The laminated busbar structure of the present utility model does not add any additional structures. Compared with the traditional method of laminated busbars with increased creepage distance, the cost is lower and there is no risk of insulation strip falling off; and because there is no The insulating strip is protruding, and there is no interference with power components on the busbar, which is easy to assemble.

4. In the laminated busbar structure of the present utility model, there is a cavity between the conductive terminals at the superposition of the insulation hole, so that a part of the conductive terminals is in a suspended state, which can offset part of the installation error and improve the reliability of electrical contact.

Description of drawings

Figure 1 is a schematic diagram of the principle of creepage distance.

Fig. 2 is a schematic diagram of a front view structure of a conventional IGBT component.

Fig. 3 is a schematic diagram of a side-view structure of a conventional IGBT component.

Fig. 4 is a schematic diagram of creepage distance on traditional IGBT components.

FIG. 5 is a schematic diagram of the creepage distance on the IGBT component after the traditional creepage distance is increased.

Fig. 6 is a schematic diagram of the three-dimensional decomposition structure of the present invention.

Fig. 7 is a schematic diagram of the structural principle of the utility model after assembly.

illustration:

1. Creepage distance; 2. Insulation groove; 3. Insulation strip; 4. Positive plate; 5. Positive conductive terminal; 6. First positive insulating layer; 7. Second positive insulating layer; 8. Negative plate; 9 , negative conductive terminal; 10, first negative insulating layer; 11, second negative insulating layer; 12, intermediate adhesive layer; 101, negative busbar insulation relief hole; 102, positive busbar insulation relief hole; 103, cavity ; 104, the first creepage path; 105, the second creepage path.

detailed description

The utility model will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figures 6 and 7, the laminated busbar structure of the present invention includes an intermediate adhesive layer 12 and two-stage positive and negative busbars, both of which are thermally insulated The film form seals and insulates the edges in the holes, and the busbars after the edgebanding and insulation are combined into laminated busbars through the intermediate adhesive layer 12 . Among them, the positive busbar includes a positive plate 4, a positive conductive terminal 5, a first positive insulating layer 6 and a second positive insulating layer 7, and a negative busbar includes a negative plate 8, a negative conductive terminal 9, a first negative insulating layer 10 and a second positive insulating layer. Two negative insulating layers 11 . The positive plate 4 is provided with a positive busbar insulation hole 102 for matching with the negative conductive terminal 9, and the negative plate 8 is provided with a negative busbar insulation hole 101 for matching with the positive conductive terminal 5, and an insulating film is provided in the hole , that is, the insulating film forming edge sealing method is adopted. In a preferred embodiment, the forming edge sealing direction of the insulating film in the hole is from the inside to the outside along the laminated busbar. The positive conductive terminal 5 passes through the insulating hole 101 of the negative busbar, and the negative conductive terminal 9 passes through the insulating hole 102 of the positive busbar. Overmolded edge insulation.

In this embodiment, the middle adhesive layer 12 adopts a hollow design between the two poles, so that a partitioned cavity 103 is formed between the positive conductive terminal 5 and the negative conductive terminal 9 at the overlap of the insulating hole, and the distance should be greater than Creepage minimum slot width X, that is, the distance between the positive and negative insulation layers is greater than the creepage minimum slot width X, which blocks the creepage path along the surface insulation layer in the straight line distance between the two poles, effectively increasing the creepage between the two poles distance. The middle bonding layer of the laminated busbar is designed with openings between the two poles, and the shape is not limited.

It can be seen from the above that the utility model increases the creepage distance by improving the edge sealing structure of the insulating film without adding any additional structure. Compared with the traditional method of increasing the creepage distance of the laminated busbar, the cost is lower and there is no Risk of strip insulation falling off. The busbar adopts the traditional laminated busbar insulating film edge sealing process, only the direction of the edge sealing is changed, and the middle insulating layer is hollowed out, the process is simple and easy to realize; there is no protruding insulating strip, and there is no gap between the busbar and the busbar. Interference problem of power components is easy to assemble; there is a cavity 103 between the conductive terminals where the insulating hole overlaps, so that a part of the conductive terminal is suspended, so that it has a certain degree of elasticity, which can offset part of the installation error and greatly improve the reliability of electrical contact.

The above are only preferred implementations of the utility model, and the scope of protection of the utility model is not limited to the above-mentioned embodiments, and all technical solutions under the thinking of the utility model all belong to the scope of protection of the utility model. It should be pointed out that for those of ordinary skill in the art, some improvements and modifications without departing from the principle of the utility model should be regarded as the protection scope of the utility model.

Claims (3)

1. A laminated busbar structure, characterized in that it includes an intermediate adhesive layer (12) and a positive busbar and a negative busbar representing two levels, the positive busbar includes a positive plate (4) and a positive conductive terminal ( 5), the negative busbar includes a negative plate (8) and a negative conductive terminal (9), and the positive plate (4) is provided with a positive busbar insulation hole (102) for matching with the negative conductive terminal (9). ), the negative plate (8) is provided with a negative busbar insulation relief hole (101) for matching with the positive conductive terminal (5), the positive busbar insulation relief hole (102) and the negative busbar insulation relief hole An insulating film is provided in the holes of (101) for edge sealing and insulation, and the busbars after edge sealing and insulation are combined into laminated busbars through the intermediate adhesive layer (12). 2 . The laminated busbar structure according to claim 1 , wherein the sealing direction of the insulation film in the hole is from inside to outside along the laminated busbar. 3 . 3. The laminated busbar structure according to claim 1 or 2, characterized in that the intermediate adhesive layer (12) is hollowed out between the two poles, and the positive conductive terminal (5) and the negative conductive terminal ( 9) An isolated cavity (103) is formed at the overlap of the insulating holes, and the distance of the cavity (103) is greater than the minimum creepage slot width.