CN220692479U - Laminated busbar - Google Patents

Abstract

The present description relates to a laminated busbar. The laminated busbar is provided with a first lead-out end and a second lead-out end, the first lead-out end is used for electrically connecting the positive electrode busbar and the neutral point busbar, and the second lead-out end is used for electrically connecting the neutral point busbar and the negative electrode busbar; the laminated busbar is provided with a plurality of first mounting hole pairs and a plurality of second mounting hole pairs, the first mounting hole pairs comprise positive electrode mounting holes electrically connected with the positive electrode busbar and neutral point mounting holes electrically connected with the neutral point busbar, and the second mounting hole pairs comprise neutral point mounting holes electrically connected with the neutral point busbar and negative electrode mounting holes electrically connected with the negative electrode busbar; the sum of the distances between the plurality of first mounting hole pairs and the first leading-out end is smaller than the sum of the distances between the plurality of second mounting hole pairs and the second leading-out end, and the sum of the distances between the plurality of second mounting hole pairs and the second leading-out end is smaller than the sum of the distances between the plurality of second mounting hole pairs and the first leading-out end. The laminated busbar of the embodiment of the specification has lower parasitic inductance.

Description

Laminated busbar

Technical Field

The specification relates to the field of electric power technology, and in particular relates to a laminated busbar.

Background

In recent years, with the wide application of power electronic devices with medium and high voltage and large capacity in the fields of photovoltaic, energy storage and automobiles, the two-level inverter circuit adopting the silicon-insulated gate bipolar transistor is gradually not applicable due to the problems of limited voltage resistance, difficult series voltage equalizing and the like of the power device, so that the three-level inverter circuit which is easier to realize compact design is widely applicable in the fields by virtue of lower device voltage stress, higher capacity and better EMI characteristics.

The laminated busbar, also called as composite busbar and laminated busbar, is a connection busbar with a multilayer composite structure and has wide application in the field of electric equipment power distribution. Because the silicon carbide device in the three-level inverter circuit has high switching speed, smaller parasitic inductance is needed to prevent over-high voltage overshoot and oscillation phenomena and other potential safety hazards from occurring in switching transient state, thereby threatening the safe operation of the circuit and affecting the electrical reliability of the circuit. The current stromatolite busbar, the inductance is great, can't satisfy the demand.

Disclosure of Invention

The embodiment of the specification provides a laminated busbar with lower inductance.

The embodiment of the specification provides a laminated busbar, which comprises a positive electrode busbar, a neutral point busbar and a negative electrode busbar which are arranged in a laminated manner; the laminated busbar is provided with a first lead-out end and a second lead-out end, the first lead-out end is used for electrically connecting the positive electrode busbar and the neutral point busbar, and the second lead-out end is used for electrically connecting the neutral point busbar and the negative electrode busbar;

the laminated busbar is provided with a plurality of first mounting hole pairs and a plurality of second mounting hole pairs, the first mounting hole pairs comprise positive electrode mounting holes electrically connected with the positive electrode busbar and neutral point mounting holes electrically connected with the neutral point busbar, and the second mounting hole pairs comprise neutral point mounting holes electrically connected with the neutral point busbar and negative electrode mounting holes electrically connected with the negative electrode busbar;

the sum of the distances between the plurality of first mounting hole pairs and the first leading-out end is smaller than the sum of the distances between the plurality of second mounting hole pairs and the second leading-out end, and the sum of the distances between the plurality of second mounting hole pairs and the second leading-out end is smaller than the sum of the distances between the plurality of second mounting hole pairs and the first leading-out end.

The laminated busbar of the embodiment of the specification may be provided with a plurality of first mounting hole pairs and a plurality of second mounting hole pairs, the first mounting hole pairs include a positive electrode mounting hole electrically connected with the positive electrode busbar and a neutral point mounting hole electrically connected with the neutral point busbar, and the second mounting hole pairs include a neutral point mounting hole electrically connected with the neutral point busbar and a negative electrode mounting hole electrically connected with the negative electrode busbar. The sum of the distances between the plurality of first mounting hole pairs and the first leading-out end is smaller than the sum of the distances between the plurality of second mounting hole pairs and the second leading-out end, and the sum of the distances between the plurality of second mounting hole pairs and the second leading-out end is smaller than the sum of the distances between the plurality of second mounting hole pairs and the first leading-out end. In the embodiment of the specification, the structure of the laminated busbar is optimized, and the positions of the mounting hole pairs on the laminated busbar are optimized. The plurality of first mounting hole pairs are positioned generally closer to the first lead-out end, generally reducing the current path length of the plurality of first mounting hole pairs. The plurality of second mounting hole pairs are positioned generally closer to the second lead-out end, generally reducing the current path length of the plurality of second mounting hole pairs. Thereby reducing the parasitic inductance of the laminated busbar as a whole.

Drawings

In order to more clearly illustrate the embodiments of the present description or the solutions in the prior art, the drawings that are required for the embodiments or the description of the prior art will be briefly described, the drawings in the following description are only some embodiments described in the present description, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of the positions of mounting holes in a laminated busbar according to the related art;

FIG. 2 is an exploded view of a laminated busbar according to an embodiment of the present disclosure;

fig. 3 is a schematic view illustrating the positions of mounting holes on a stacked busbar according to an embodiment of the present disclosure.

Detailed Description

The technical solutions of the embodiments of the present specification will be clearly and completely described below with reference to the drawings in the embodiments of the present specification, and it is apparent that the described embodiments are only some embodiments of the present specification, not all embodiments. The specific embodiments described herein are to be considered in an illustrative rather than a restrictive sense. All other embodiments derived by a person of ordinary skill in the art based on the described embodiments of the present disclosure fall within the scope of the present disclosure. In addition, relational terms such as "first" and "second", and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.

In the related art, the positions of the mounting holes on the three-level laminated busbar may be as shown in fig. 1.

In fig. 1, + represents a positive electrode mounting hole electrically connected to a positive electrode busbar, N represents a neutral point mounting hole electrically connected to a neutral point busbar, and-represents a negative electrode mounting hole electrically connected to a negative electrode busbar. Dashed boxes are used to indicate pairs of mounting holes. A1, A2, A3, A4 and A5 are first mounting hole pairs, and B1, B2, B3, B4 and B5 are second mounting hole pairs. The first mounting hole pair comprises a positive electrode mounting hole electrically connected with the positive electrode busbar and a neutral point mounting hole electrically connected with the neutral point busbar. The second mounting hole pair comprises a neutral point mounting hole electrically connected with the neutral point busbar and a negative electrode mounting hole electrically connected with the negative electrode busbar.

In fig. 1, 5 pairs of first mounting holes A1, A2, A3, A4, A5, etc. are located farther from the first lead-out end as a whole and closer to the second lead-out end. Thereby resulting in longer current path lengths of the commutation loop in the stacked busbar and a consequent larger overall parasitic inductance of the stacked busbar.

Please refer to fig. 2. Embodiments of the present disclosure provide a laminated busbar, particularly with low inductance. The laminated busbar may comprise a three-level laminated busbar. The three-level laminated busbar can be applied to three-level inverter circuits such as three-level frequency converters and the like. The laminated busbar can comprise a positive electrode busbar, a neutral point busbar and a negative electrode busbar which are arranged in a laminated manner. Specifically, the laminated busbar may include a first insulating layer, a positive electrode busbar, a second insulating layer, a neutral point busbar, a third insulating layer, a negative electrode busbar, and a fourth insulating layer that are sequentially laminated. The laminated busbar can be obtained by pressing the first insulating layer, the positive electrode busbar, the second insulating layer, the neutral point busbar, the third insulating layer, the negative electrode busbar and the fourth insulating layer, and fixedly connecting the first insulating layer, the positive electrode busbar, the second insulating layer, the neutral point busbar, the third insulating layer, the negative electrode busbar and the fourth insulating layer by bolts.

The first insulating layer, the second insulating layer, the third insulating layer, and the fourth insulating layer are used for achieving electrical isolation. The materials of the first insulating layer, the second insulating layer, the third insulating layer, and the fourth insulating layer may be insulating materials such as PET (polyethylene terephthalate). The positive electrode busbar, the neutral point busbar and the negative electrode busbar may be conductor plates. The positive electrode busbar, the neutral point busbar and the negative electrode busbar can be made of low-resistivity conductive materials such as red copper. The resistivity of the conductive material may be less than or equal to a set threshold. In the stacked busbar, the current flow direction is opposite on adjacent busbars. Specifically, the directions of currents on the positive electrode busbar and the neutral point busbar are opposite, and the directions of currents on the neutral point busbar and the negative electrode busbar are opposite. The distance between adjacent busbar is short and the current direction is opposite. So that the electromagnetic fields generated by the currents during the flow can cancel each other out. Thereby enabling to reduce the parasitic inductance of the laminated busbar.

In some embodiments, please refer to fig. 3. The laminated busbar may be provided with a first lead-out terminal and a second lead-out terminal. The first leading-out end is used for electrically connecting the positive electrode busbar and the neutral point busbar, so that the external circuit is electrically connected with the positive electrode busbar and the neutral point busbar. Specifically, the first lead-out terminal may include a first pin of the positive busbar and a second pin of the neutral busbar. The first pin may be used for electrical connection with one end of an external circuit, and the second pin may be used for electrical connection with the other end of the external circuit. The second leading-out end is used for electrically connecting the neutral point busbar and the negative electrode busbar, so that the external circuit is electrically connected with the neutral point busbar and the negative electrode busbar. Specifically, the second lead-out terminal may include a third pin of the neutral busbar, which may be used for electrically connecting with one end of the external circuit, and a fourth pin of the negative busbar, which may be used for electrically connecting with the other end of the external circuit. The shape of the laminated busbar can be rectangular. The first lead-out terminal and the second lead-out terminal may be arranged side by side at the same end of the laminated busbar. For example, the first pin, the second pin, the third pin, and the fourth pin may be sequentially arranged at the same end of the laminated busbar.

In some embodiments, the laminated busbar may have a plurality of first mounting hole pairs and a plurality of second mounting hole pairs disposed thereon. The first pair of mounting holes may include 2 mounting holes for mounting circuit elements. Specifically, the first mounting hole pair may include a positive electrode mounting hole electrically connected with the positive electrode busbar and a neutral point mounting hole electrically connected with the neutral point busbar. The positive mounting hole may be electrically connected to one end of the circuit element, and the neutral mounting hole may be electrically connected to the other end of the circuit element. The second pair of mounting holes may include 2 mounting holes for mounting circuit elements. Specifically, the second mounting hole pair may include a neutral point mounting hole electrically connected to the neutral point busbar and a negative electrode mounting hole electrically connected to the negative electrode busbar. The neutral point mounting hole may be electrically connected to one end of the circuit element, and the negative electrode mounting hole may be electrically connected to the other end of the circuit element. The circuit elements may include capacitors and the like. The capacitance may include a thin film capacitance or the like.

In practical applications, the capacitor may be located below the fourth insulating layer. Two pins of the capacitor can be inserted into two mounting holes in the same mounting hole pair, so that the capacitor is electrically connected with the busbar.

For example, please refer to fig. 3.+ represents a positive electrode mounting hole electrically connected to the positive electrode busbar, N represents a neutral point mounting hole electrically connected to the neutral point busbar, and-represents a negative electrode mounting hole electrically connected to the negative electrode busbar. Dashed boxes are used to indicate pairs of mounting holes. Wherein C1, C2, C3, C4, C5 are first mounting hole pairs, and D1, D2, D3, D4, D5 are second mounting hole pairs. 5 first mounting hole pairs such as C1, C2, C3, C4 and C5 can be used for mounting 5 capacitors, and 5 second mounting hole pairs such as D1, D2, D3, D4 and D5 can be used for mounting 5 capacitors. And 10 capacitors can be arranged on the laminated busbar.

In some embodiments, the first pair of mounting holes may have a current path. The current path of the first mounting hole to the commutation loop may include: the circuit comprises a first pin, a positive electrode busbar, a positive electrode mounting hole of a first mounting hole pair, a circuit element, a neutral point mounting hole of the first mounting hole pair, a neutral point busbar and a second pin. The second pair of mounting holes may have a current path. The current path of the second mount Kong Duihuan flow loop may comprise: the third pin, the neutral point busbar, the neutral point mounting hole of the second mounting hole pair, the capacitor, the negative electrode mounting hole of the second mounting hole pair, the negative electrode busbar and the fourth pin.

In some embodiments, the sum of the distances between the plurality of first mounting hole pairs and the first lead-out end is less than the sum of the distances between the plurality of first mounting hole pairs and the second lead-out end. Thus, the plurality of first mounting hole pairs may be positioned generally closer to the first lead-out end and farther from the second lead-out end. So that the current path length of the plurality of first mounting holes to the commutation loop can be reduced as a whole. The sum of the distances between the plurality of second mounting hole pairs and the second leading-out end is smaller than the sum of the distances between the plurality of second mounting hole pairs and the first leading-out end. Thus, the plurality of second mounting hole pairs may be positioned generally closer to the second lead-out end than the first lead-out end. So that the current path length of the plurality of second mounting Kong Duihuan flow circuits can be reduced as a whole. Since the current path lengths of the plurality of first mounting holes to the commutation loop are reduced as a whole, and the current path lengths of the plurality of second mounting Kong Duihuan current loops are reduced as a whole, parasitic inductance of the laminated busbar can be reduced as a whole.

Wherein, the distance between the first plurality of mounting hole pairs and the first leading-out end may include: and adding the distances between the plurality of first mounting hole pairs and the first leading-out end. The distance between the plurality of first mounting hole pairs and the second lead-out terminal may include: and adding the distances between the plurality of first mounting hole pairs and the second leading-out end. The distance between the plurality of second mounting hole pairs and the second lead-out terminal may include: and adding the distances between the plurality of second mounting hole pairs and the second leading-out end. The distance between the plurality of second mounting hole pairs and the first lead-out end may include: and the addition result is obtained by adding the distances between the plurality of second mounting hole pairs and the first leading-out end.

Wherein, the distance between each first mounting hole pair and the first lead-out end may include: and adding the distance between the positive electrode mounting hole and the first pin and the distance between the neutral point mounting hole and the second pin. The distance between each first mounting hole pair and the second terminal may include: and adding the distance between the positive electrode mounting hole and the third pin and the distance between the neutral point mounting hole and the fourth pin. The distance between each second pair of mounting holes and the first lead-out end may include: and adding the distance between the neutral point mounting hole and the first pin and the distance between the negative electrode mounting hole and the second pin. The distance between each second pair of mounting holes and the second pigtail may include: and adding the distance between the neutral point mounting hole and the third pin and the distance between the negative electrode mounting hole and the fourth pin.

The distance may comprise a straight line distance. For example, the distance between the first pair of mounting holes and the first lead-out end may be a straight line distance therebetween, and the distance between the positive electrode mounting hole and the first pin may be a straight line distance therebetween.

It should be noted that, in the plurality of first mounting hole pairs, a distance between each first mounting hole pair and the first lead-out end may be smaller than a distance between each first mounting hole pair and the second lead-out end. The distance between each of the plurality of second mounting hole pairs and the second lead-out end may be smaller than the distance between the first lead-out end. Alternatively, among the plurality of first mounting hole pairs, there may be a first mounting hole pair having a larger distance from the first lead-out end than from the second lead-out end, and a first mounting hole pair having a smaller distance from the first lead-out end than from the second lead-out end. But the sum of the distances between the plurality of first mounting hole pairs and the first lead-out ends is smaller than the sum of the distances between the plurality of first mounting hole pairs and the second lead-out ends. Such that the plurality of first mounting hole pairs are positioned generally adjacent the first lead-out end. Alternatively, among the plurality of second mounting hole pairs, there may be a second mounting hole pair having a smaller distance from the first lead-out end than from the second lead-out end, and a second mounting hole pair having a larger distance from the first lead-out end than from the second lead-out end. But the sum of the distances between the plurality of second mounting hole pairs and the second lead-out end is smaller than the sum of the distances between the plurality of second mounting hole pairs and the first lead-out end. Such that the plurality of second mounting hole pairs are positioned generally adjacent the second lead-out end.

The explanation will be given below taking fig. 3 as an example.

And 5 first mounting hole pairs such as C1, C2, C3, C4, C5 and the like are arranged on the laminated busbar. The sum of the distances between the 5 first mounting hole pairs and the first leading-out end may be r_c1+r_c2+r_c3+r_c4+r_c5.R_c1 represents the distance between C1 and the first outlet, r_c2 represents the distance between C2 and the first outlet, r_c3 represents the distance between C3 and the first outlet, r_c4 represents the distance between C4 and the first outlet, and r_c5 represents the distance between C5 and the first outlet. The sum of the distances between the 5 first mounting hole pairs and the second lead-out end may be s_c1+s_c2+s_c3+s_c4+s_c5.S_c1 represents the distance between C1 and the second outlet, s_c2 represents the distance between C2 and the second outlet, s_c3 represents the distance between C3 and the second outlet, s_c4 represents the distance between C4 and the second outlet, and s_c5 represents the distance between C5 and the second outlet. R_C1+R_C2+R_C3+R_C4+R_C5 is smaller than S_C1+S_C2+S_C3+S_C4+S_C5.

Where r_c1=r_c1_1+r_c1_2. R_c1_1 represents the distance between the positive electrode mounting hole in C1 and the first pin, and r_c1_2 represents the distance between the neutral point mounting hole in C1 and the second pin. R_C2, R_C3, R_C4, R_C5 can be obtained in a similar manner and are not described in detail herein.

Where s_c1=s_c1_1+s_c1_2. S_c1_1 represents the distance between the neutral point mounting hole in C1 and the third pin, and s_c1_2 represents the distance between the negative electrode mounting hole in C1 and the fourth pin. S_c2, s_c3, s_c4, s_c5 may be obtained in a similar manner, and will not be described here.

And 5 second mounting hole pairs such as D1, D2, D3, D4 and D5 are also arranged on the laminated busbar. The sum of the distances between the 5 second mounting hole pairs and the first leading-out end can be R_D1+R_D2+R_D3+R_D4+R_D5.R_d1 represents the distance between D1 and the first lead-out end, r_d2 represents the distance between D2 and the first lead-out end, r_d3 represents the distance between D3 and the first lead-out end, r_d4 represents the distance between D4 and the first lead-out end, and r_d5 represents the distance between D5 and the first lead-out end. The sum of the distances between the 5 second mounting hole pairs and the second lead-out end can be S_D1+S_D2+S_D3+S_D4+S_D5.S_d1 represents the distance between D1 and the second lead-out end, s_d2 represents the distance between D2 and the second lead-out end, s_d3 represents the distance between D3 and the second lead-out end, s_d4 represents the distance between D4 and the second lead-out end, and s_d5 represents the distance between D5 and the second lead-out end. R_d1+r_d2+r_d3+r_d4+r_d5 is smaller than s_d1+s_d2+s_d3+s_d4+s_d5.

Where r_d1=r_d1_1+r_d1_2. R_d1_1 represents the distance between the neutral point mounting hole in D1 and the first pin, and r_d1_2 represents the distance between the negative electrode mounting hole in D1 and the second pin. R_D2, R_D3, R_D4, R_D5 may be obtained in a similar manner and are not described in detail herein.

Where s_d1=s_d1_1+s_d1_2. S_d1_1 represents the distance between the neutral point mounting hole in D1 and the third pin, and s_d1_2 represents the distance between the negative electrode mounting hole in D1 and the fourth pin. S_d2, s_d3, s_d4, s_d5 can be obtained in a similar manner, and will not be described here.

In some embodiments, the laminated busbar is provided with M pairs of first mounting holes and N pairs of second mounting holes, m=n. Thus, the number of the first mounting hole pairs and the number of the second mounting hole pairs on the laminated busbar can be equal. So that the sum of the distances between the M first mounting hole pairs and the first lead-out end and the sum of the distances between the N second mounting hole pairs and the second lead-out end are close to each other as a whole. Thereby enabling a further reduction of the overall parasitic inductance of the laminated busbar.

The approaching may include equality or a difference less than or equal to a set value.

In some embodiments, the shape of the laminated busbar may be rectangular. The first lead-out terminal and the second lead-out terminal may be arranged side by side at the same end of the laminated busbar. The plurality of first mounting hole pairs may be positioned adjacent the first lead-out end and the plurality of second mounting hole pairs may be positioned adjacent the second lead-out end. For example, the laminated busbar may be divided into a first region and a second region. The first region and the second region may be rectangular regions. The boundary between the first region and the second region may be a straight line. The dividing line may be parallel to one side of the laminated busbar. The parting line may pass through a midpoint of the first and second terminals. The plurality of first mounting hole pairs and the first pigtail may be located in a first region and the plurality of second mounting hole pairs and the second pigtail may be located in a second region.

Please refer to fig. 3. In some examples of this scenario, the laminated busbar may have M pairs of first mounting holes and N pairs of second mounting holes, where m=n=5. The laminated busbar is transversely provided with a first row of mounting hole pairs and a second row of mounting hole pairs. The first row of mounting holes comprises a second mounting hole pair, a first mounting hole pair and a first mounting hole pair in sequence, and the second row of mounting holes comprises a first mounting hole pair, a second mounting hole pair and a second mounting hole pair in sequence. The distance between adjacent pairs of the first row of pairs of mounting holes is a first value. The distance between adjacent pairs of the second row of pairs of mounting holes is a second value. The first value and the second value may be equal. Thus, the M first mounting hole pairs and the N second mounting hole pairs may form 5 columns of mounting hole pairs in the longitudinal direction.

The laminated busbar of the embodiment of the specification may be provided with a plurality of first mounting hole pairs and a plurality of second mounting hole pairs, the first mounting hole pairs include a positive electrode mounting hole electrically connected with the positive electrode busbar and a neutral point mounting hole electrically connected with the neutral point busbar, and the second mounting hole pairs include a neutral point mounting hole electrically connected with the neutral point busbar and a negative electrode mounting hole electrically connected with the negative electrode busbar. The sum of the distances between the plurality of first mounting hole pairs and the first leading-out end is smaller than the sum of the distances between the plurality of second mounting hole pairs and the second leading-out end, and the sum of the distances between the plurality of second mounting hole pairs and the second leading-out end is smaller than the sum of the distances between the plurality of second mounting hole pairs and the first leading-out end. In the embodiment of the specification, the structure of the laminated busbar is optimized, and the positions of the mounting hole pairs on the laminated busbar are optimized. The plurality of first mounting hole pairs are positioned generally closer to the first lead-out end, generally reducing the current path length of the plurality of first mounting hole pairs. The plurality of second mounting hole pairs are positioned generally closer to the second lead-out end, generally reducing the current path length of the plurality of second mounting hole pairs. The parasitic inductance of the laminated busbar is reduced as a whole.

Those skilled in the art will appreciate that the descriptions of various embodiments are provided herein with respect to each of the embodiments, and that reference may be made to the relevant descriptions of other embodiments for parts of one embodiment that are not described in detail. In addition, it will be appreciated that those skilled in the art, upon reading the present specification, may conceive of any combination of some or all of the embodiments set forth herein without any inventive effort, and that such combination is within the scope of the disclosure and protection of the present specification.

Although the present specification is depicted by way of example, it will be appreciated by those skilled in the art that the above examples are merely intended to aid in understanding the core ideas of the present specification. Those skilled in the art will appreciate numerous modifications and variations therefrom. It is intended that the appended claims cover such modifications and variations as fall within the true spirit of this present description.

Claims (10)

1. The laminated busbar is characterized by comprising a positive electrode busbar, a neutral point busbar and a negative electrode busbar which are arranged in a laminated manner; the laminated busbar is provided with a first lead-out end and a second lead-out end, the first lead-out end is used for electrically connecting the positive electrode busbar and the neutral point busbar, and the second lead-out end is used for electrically connecting the neutral point busbar and the negative electrode busbar;

the laminated busbar is provided with a plurality of first mounting hole pairs and a plurality of second mounting hole pairs, the first mounting hole pairs comprise positive electrode mounting holes electrically connected with the positive electrode busbar and neutral point mounting holes electrically connected with the neutral point busbar, and the second mounting hole pairs comprise neutral point mounting holes electrically connected with the neutral point busbar and negative electrode mounting holes electrically connected with the negative electrode busbar;

the sum of the distances between the plurality of first mounting hole pairs and the first leading-out end is smaller than the sum of the distances between the plurality of second mounting hole pairs and the second leading-out end, and the sum of the distances between the plurality of second mounting hole pairs and the second leading-out end is smaller than the sum of the distances between the plurality of second mounting hole pairs and the first leading-out end.

2. The laminated busbar of claim 1, wherein the first lead-out comprises a first pin of a positive busbar and a second pin of a neutral busbar, the second lead-out comprising a third pin of a neutral busbar and a fourth pin of a negative busbar;

the distance between the first mounting hole pair and the first leading-out end comprises: an addition result obtained by adding the distance between the positive electrode mounting hole and the first pin and the distance between the neutral point mounting hole and the second pin;

the distance between the first mounting hole pair and the second leading-out end comprises: an addition result obtained by adding the distance between the positive electrode mounting hole and the third pin and the distance between the neutral point mounting hole and the fourth pin;

the distance between the second mounting hole pair and the first leading-out end comprises: an addition result obtained by adding the distance between the neutral point mounting hole and the first pin and the distance between the negative electrode mounting hole and the second pin;

the distance between the second mounting hole pair and the second leading-out end comprises: and adding the distance between the neutral point mounting hole and the third pin and the distance between the negative electrode mounting hole and the fourth pin.

3. The laminated busbar of claim 1 or 2, wherein each of the first pair of mounting holes is spaced from the first exiting end by a distance less than a distance between the first pair of mounting holes and the second exiting end, and wherein each of the second pair of mounting holes is spaced from the second exiting end by a distance less than a distance between the second pair of mounting holes and the first exiting end.

4. The laminated busbar of claim 1, wherein M pairs of first mounting holes and N pairs of second mounting holes, M = N, are provided on the laminated busbar.

5. The laminated busbar of claim 4, wherein M = N = 5; correspondingly, a first row of mounting hole pairs and a second row of mounting hole pairs are arranged on the laminated busbar, the first row of mounting hole pairs sequentially comprise a second mounting hole pair, a first mounting hole pair and a first mounting hole pair, and the second row of mounting hole pairs sequentially comprise a first mounting hole pair, a second mounting hole pair and a second mounting hole pair.

6. The laminated busbar of claim 5, wherein the laminated busbar is rectangular in shape;

the first leading-out ends and the second leading-out ends are arranged side by side at the same end of the laminated busbar, the M first mounting hole pairs are close to the first leading-out ends in position, and the N second mounting hole pairs are close to the second leading-out ends in position.

7. The laminated busbar of claim 1, wherein the laminated busbar comprises a first insulating layer, a positive busbar, a second insulating layer, a neutral busbar, a third insulating layer, a negative busbar, and a fourth insulating layer in a laminated arrangement.

8. The laminated busbar of claim 7, wherein the positive busbar, the neutral busbar and the negative busbar are made of red copper; the first insulating layer, the second insulating layer, the third insulating layer and the fourth insulating layer are made of PET.

9. The laminated busbar of claim 1, wherein the first mounting hole pair, the positive mounting hole is for electrically connecting with one end of the capacitor, and the neutral mounting hole is for electrically connecting with the other end of the capacitor; the second mounting hole is centered, the neutral point mounting hole is used for being electrically connected with one end of the capacitor, and the negative electrode mounting hole is used for being electrically connected with the other end of the capacitor.

10. The laminated busbar of claim 9, wherein the current path of the first pair of mounting holes comprises: pins of the positive electrode busbar, the positive electrode mounting hole of the first mounting hole pair, the capacitor, a neutral point mounting hole of the first mounting hole pair, the neutral point busbar and pins of the neutral point busbar in the first lead-out end; the current path of the second mounting hole pair includes: the pins of the neutral point busbar, the neutral point mounting hole of the second mounting hole pair, the capacitor, the negative electrode mounting hole of the second mounting hole pair, the negative electrode busbar and the pins of the negative electrode busbar in the second lead-out end.