Low self-inductance capacitor for flexible direct current converter valve

Abstract

The invention relates to the technical field of flexible direct-current power transmission, in particular to a low-self-inductance capacitor for a flexible direct-current converter valve. The invention provides a low self-inductance capacitor which comprises a first element strip, a second element strip, a first busbar and a second busbar, the first element strip comprises a first conductive band, a second conductive band and a plurality of first elements, the second element strip comprises a third conductive band, a fourth conductive band and a plurality of second elements, and the third conductive band and the fourth conductive band are arranged along a first direction. The first busbar and the second busbar are arranged on the same side or different sides of the first element strip and the second element strip; in the winding axis direction of the first element or the second element, the first conductive band is closer to the third conductive band than the fourth conductive band, the first conductive band and the third conductive band have the same polarity and are both connected with the first busbar, and the second conductive band and the fourth conductive band have the same polarity and are both connected with the second busbar. The second busbar is provided with a first connecting end, and the first connecting end is located between the second conductive band and the fourth conductive band.

Description

Technical Field

[0001] The present application relates to the technical field of flexible direct current transmission, and in particular to a low self-inductance capacitor for a flexible direct current converter valve. Background Art

[0002] Flexible DC transmission technology uses voltage source converters and fully controlled power electronic devices. This transmission technology can provide good dynamic reactive power support, has excellent grid-connected performance, and does not have synchronization stability problems. Flexible DC transmission is one of the best choices for the future use of high-voltage DC grids to achieve large-scale clean energy generation and transmission.

[0003] The converter valve is the core equipment of the flexible DC transmission project, and the capacitor for the flexible DC converter valve is the core component of the converter valve, which is the key hub device and energy storage element for realizing energy interaction.

[0004] The capacitor itself has parasitic inductance (hereinafter referred to as self-inductance), and when the switch device is activated, a corresponding induced electromotive force is generated. As the transmission capacity increases, the current of the switch device increases, and the self-inductance and heat generated by the capacitor increase. However, due to the excessive self-inductance and heat of the capacitor, other electronic devices in the converter valve will be damaged, so it cannot meet the requirements. Summary of the invention

[0005] The present application provides a low self-inductance capacitor for a flexible DC converter valve, which solves the technical problems of excessive self-inductance and excessive heat generated by the capacitor, and achieves the technical effect of reducing the self-inductance and heat generated by the capacitor.

[0006] In order to achieve the above objectives, the main technical solutions adopted in this application include:

[0007] In a first aspect, an embodiment of the present application provides a low self-inductance capacitor for a flexible DC converter valve, comprising a first component strip, a second component strip, a first bus and a second bus, the first component strip comprising a first conductive strip, a second conductive strip and a plurality of first components, the plurality of first components are arranged in sequence along a first direction, the first conductive strip and the second conductive strip both extend along the first direction, the first direction is perpendicular to the winding axis direction of the first component, each of the first components is connected to the first conductive strip at one end in the direction of its winding axis, and each of the first components is connected to the second conductive strip at the other end in the direction of its winding axis; the second component strip comprises a third conductive strip, a fourth conductive strip and a plurality of second components, the plurality of second components are arranged in sequence along the first direction, the third conductive strip and the fourth conductive strip both extend along the first direction, the winding axis direction of the second component is perpendicular to the first The winding axis direction of an element is parallel, each of the second elements is connected to the third conductive tape at one end in the winding axis direction, and each of the second elements is connected to the fourth conductive tape at the other end in the winding axis direction; along the first direction, the first bus and the second bus are arranged on the same side or different sides of the first element strip and the second element strip; wherein, along the winding axis direction of the first element or the second element, the first conductive tape is closer to the third conductive tape than the fourth conductive tape, the first conductive tape and the third conductive tape have the same polarity and are both connected to the first bus, the second conductive tape and the fourth conductive tape have the same polarity and are both connected to the second bus, and the second bus is provided with a first connecting end, and along the winding axis direction of the first element or the second element, the first connecting end is located between the second conductive tape and the fourth conductive tape.

[0008] In the low self-inductance capacitor proposed in the embodiment of the present application, each first element is connected to the first conductive belt and the second conductive belt at both ends of its winding axis, and each second element is connected to the third conductive belt and the fourth conductive belt at both ends of its winding axis; along the winding axis direction of the first element or the second element, the first conductive belt is close to the third conductive belt and both are connected to the first bus to form one pole of the capacitor, the second conductive belt is far away from the third conductive belt, and the second conductive belt and the fourth conductive belt are both connected to the second bus to form the other pole of the capacitor, that is, along the winding axis direction of the first element or the second element, the second conductive belt and the fourth conductive belt are connected to the second bus to form the other pole of the capacitor. The conductive tape is connected to opposite sides of the second bus; the second bus has a first connection end, and along the winding axis direction of the first element or the second element, the first connection end is located between the second conductive tape and the fourth conductive tape. When current is introduced into the second bus from the first connection end, the current flows from the first connection end to the second conductive tape and the fourth conductive tape respectively. The current flowing to the second conductive tape and the current flowing to the fourth conductive tape on the second bus are in opposite directions. Therefore, the inductance generated by the current loop flowing to the second conductive tape and the inductance generated by the current loop flowing to the fourth conductive tape will offset a part, thereby reducing the self-inductance of the capacitor.

[0009] Furthermore, the first conductive tape and the third conductive tape can conduct the heat generated by the first element and the second element to the first bus; the second conductive tape and the fourth conductive tape can conduct the heat generated by the first element and the second element to the second bus. The first bus and the second bus with a larger area have good heat dissipation performance, which can assist the capacitor in dissipating heat, thereby reducing the thermal resistance of the capacitor, thereby achieving the purpose of reducing the heat generated by the capacitor.

[0010] Optionally, the first busbar and the second busbar are arranged on the same side of the first component bar and the second component bar; along the first direction, at least part of the second busbar is located on the side of the first busbar away from the first component bar and the second component bar. The first busbar and the second busbar are arranged on the same side of the first component bar and the second component bar, and along the first direction, at least part of the projection of the second busbar overlaps with the first busbar. When current flows through the first busbar and the second busbar, the inductance generated by the first busbar and the inductance generated by the second busbar will also offset a part, further reducing the self-inductance of the capacitor. In addition, the first busbar and the second busbar are arranged on the same side of the first component bar and the second component bar, which effectively reduces the current path, thereby reducing the self-inductance and heat generated by the capacitor.

[0011] Optionally, the second busbar includes a first body portion, a second body portion and a raised portion, the first body portion is connected to the second conductive strip, the second body portion is connected to the fourth conductive strip, and along the winding axis direction of the first element or the second element, the two ends of the raised portion are respectively connected to the first body portion and the second body portion; along the first direction, at least part of the raised portion is protruded toward a side away from the first element strip and the second element strip compared to the first body portion and the second body portion, so as to form a housing cavity for accommodating the first busbar. The second busbar has a raised portion, and the first busbar is arranged corresponding to the raised portion. The raised portion increases the distance between the first busbar and the second busbar, so that an insulation distance is formed between the first busbar and the raised portion, thereby reducing the risk of a short circuit in the capacitor.

[0012] Optionally, the raised portion is provided with an avoidance hole, and the avoidance hole penetrates the raised portion along the thickness direction of the raised portion. The avoidance hole of the raised portion facilitates the introduction or extraction of current on the first busbar.

[0013] Optionally, the raised portion includes a top wall, a first side wall, and a second side wall; along the first direction, the top wall is spaced apart from the first bus bar, the first side wall is connected to one side of the top wall and the first body portion, and the second side wall is connected to the other side of the top wall and the second body portion. Along the winding axis direction of the first element or the second element, the first side wall is connected to opposite sides of the top wall to form an accommodating cavity, the first bus bar corresponds to the accommodating cavity, and the first bus bar is spaced apart from the top wall, the first side wall, and the second side wall respectively to form an insulation distance.

[0014] Optionally, along the first direction, the minimum distance between the top wall and the first bus is 3-10 mm. Along the first direction, a distance of at least 3-10 mm is reserved between the top wall and the first bus to reduce contact between the first bus and the second bus, thereby reducing the risk of short circuit caused by the connection between the first bus and the second bus.

[0015] Optionally, along the first direction, the ends of the first conductive strip and the third conductive strip on the same side are provided with the first busbar and overlapped with the first busbar in the thickness direction; the ends of the second conductive strip and the fourth conductive strip on the same side are overlapped with the second busbar in the thickness direction. The first conductive strip and the third conductive strip overlap with the first busbar to form one pole of the capacitor, and the second conductive strip and the third conductive strip overlap with the second busbar to form the other pole of the capacitor. The current is introduced through the first connection end of the second busbar and then flows to the second conductive strip and the fourth conductive strip respectively. The two currents on the second busbar have opposite directions, and the generated inductances partially offset each other; one current flows through the first element and then flows into the first busbar through the first conductive strip, and the other current flows through the second element and then flows into the first busbar through the third conductive strip, and then flows out from the first busbar. The current on the first busbar is opposite to the current at the corresponding position on the second busbar, and the inductances generated by each other can also offset each other partially, thereby achieving the purpose of reducing the self-inductance of the capacitor.

[0016] Optionally, the first element strip and the second element strip are both multiple, and along the winding axis direction of the first element or the second element, each first element strip is arranged opposite to the corresponding second element strip; multiple first element strips are arranged in sequence along the second direction, and multiple second element strips are arranged in sequence along the second direction, and the first direction, the second direction and the winding axis direction of the first element or the second element are perpendicular to each other. After multiple first element strips are connected in parallel, multiple second element strips are connected in parallel, and then the multiple first element strips are connected in parallel as a whole with the multiple second element strips as a whole. After the multiple first element strips are connected in parallel with the multiple second element strips, the equivalent series resistance of the capacitor can be reduced, thereby reducing the heat generation of the capacitor.

[0017] Optionally, the capacitor further includes a first connection belt, a second connection belt, a third connection belt and a fourth connection belt, wherein the first connection belt is respectively connected to a plurality of the first conductive belts, the second connection belt is respectively connected to a plurality of the second conductive belts, the third connection belt is respectively connected to a plurality of the third conductive belts, and the fourth connection belt is respectively connected to a plurality of the fourth conductive belts. The first connection belt and the second connection belt are used to connect a plurality of first component strips in parallel, the third connection belt and the fourth connection belt are used to connect a plurality of second component strips in parallel, and a plurality of first component strips connected in parallel are connected in parallel with a plurality of second component strips connected in parallel, so as to reduce the equivalent series resistance of the capacitor, thereby reducing the heat generation of the capacitor.

[0018] Optionally, the first connecting belt, the second connecting belt, the third connecting belt and the fourth connecting belt are all multiple, and the multiple first connecting belts are arranged at intervals along the first direction, the multiple second connecting belts are arranged at intervals along the first direction, the multiple third connecting belts are arranged at intervals along the first direction, and the multiple fourth connecting belts are arranged at intervals along the first direction. The first connecting belt and the second connecting belt are both multiple, which can connect multiple first element strips in parallel and can also dissipate heat; the third connecting belt and the fourth connecting belt are both multiple, which can connect multiple second element strips in parallel and can also dissipate heat, thereby improving the heat dissipation efficiency of the capacitor.

[0019] Optionally, the capacitor further includes a shell, an end cover, a first terminal, and a second terminal. The shell has a storage space for accommodating the first component bar, the second component bar, the first bus bar, and the second bus bar. The shell has an opening along the first direction; the end cover is connected to the shell to close the opening; the first terminal passes through the end cover to connect with the first bus bar, and the second terminal passes through the end cover to connect with the second bus bar. The first terminal is connected to the first bus bar to form one pole of the capacitor, and the second terminal is connected to the second bus bar to form the other pole of the capacitor. The shell and the end cover enclose the first component bar and the second component bar in the shell to reduce damage to the first component bar and the second component bar.

[0020] Optionally, along the winding axis direction of the first element or the second element, the first connection end is located at the midpoint between the second conductive belt and the fourth conductive belt. When current is introduced into the second busbar from the first connection end, the current flows from the first connection end to the second conductive belt and the fourth conductive belt respectively, and the current flowing to the second conductive belt and the current flowing to the fourth conductive belt on the second busbar are in opposite directions, and the paths through which the current flows are equal, so the inductance generated by the current loop flowing to the second conductive belt and the inductance generated by the current loop flowing to the fourth conductive belt will cancel each other, thereby reducing the self-inductance of the capacitor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 A schematic diagram of the local structure of the low self-inductance capacitor of the present application;

[0023] Figure 2A schematic diagram of the local structure of the low self-inductance capacitor of the present application;

[0024] Figure 3 This is a schematic diagram of the structure of the first element bar of this application;

[0025] Figure 4 This is a schematic diagram of the structure of the second element strip of the present application;

[0026] Figure 5 This is a schematic diagram of the structure of the low self-inductance capacitor of the present application;

[0027] Figure 6 for Figure 5 Side view of low and medium self-inductance capacitors;

[0028] Figure 7 for Figure 5 Top view of low and medium self-inductance capacitors.

[0029] [Description of Reference Numerals]

[0030] 1: first element strip; 11: first element; 12: first conductive strip; 13: second conductive strip;

[0031] 2: second component strip; 21: second component; 22: third conductive strip; 23: fourth conductive strip; 3: first bus; 32: second connecting end; 4: second bus; 41: first main body; 42: first connecting end; 43 raised portion; 431: accommodating cavity; 432: avoidance hole; 433: top wall; 434: first side wall; 435: second side wall; 44: second main body; 5: first connecting strip; 6: outer shell; 61: insulating paper; 7: end cover; 8: first terminal; 9: second terminal; A: first direction; B: second direction. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0033] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0034] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0035] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0037] The term "multiple" as used in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple sheets" refers to more than two sheets (including two sheets).

[0038] At present, dry capacitors have been used in flexible DC transmission projects of ±420kV / 1.25GW and below. However, as the voltage of flexible DC transmission increases to ±500kV and ±800kV, and the transmission capacity increases to 8GW, the current of the switching device increases, the self-inductance and heat generated by the capacitor increase, and the corresponding induced electromotive force increases, which in turn damages the switching device or other electronic devices. From the formula U=L×di / dt, it can be seen that reducing the self-inductance of the capacitor can reduce the induced electromotive force. Reducing the self-inductance of the capacitor helps to reduce the electrical stress of the switching device and protect other electronic devices in the converter valve. Therefore, a capacitor that can reduce self-inductance is needed.

[0039] In addition, when the converter valve is working, ripple current flows through the capacitor, which can cause the capacitor to heat up. Excessive temperature of the capacitor can shorten its service life and even cause thermal breakdown. The relationship between the capacitor temperature rise and the ripple current effective value Irms is ΔT = I rm3 2 ×ESR×Rth, reducing the equivalent series resistance (ESR) and thermal resistance (Rth) can reduce the temperature rise of the capacitor. Reducing the heat generated by the capacitor can increase the service life of the capacitor and improve the reliability of the capacitor.

[0040] Therefore, reducing the self-inductance and heat generation of capacitors is of great significance to ensure the stable operation of flexible DC projects.

[0041] In view of this, the embodiment of the present application provides a low self-inductance capacitor for a flexible DC converter valve, referring to Figures 1 to 4The low self-inductance capacitor comprises a first component strip 1, a second component strip 2, a first bus bar 3 and a second bus bar 4, the first component strip 1 comprises a first conductive strip 12, a second conductive strip 13 and a plurality of first components 11, the plurality of first components 11 are sequentially arranged along a first direction A, the first conductive strip 12 and the second conductive strip 13 both extend along the first direction A, the first direction A is perpendicular to the winding axis direction of the first components 11, each first component 11 is connected to the first conductive strip 12 at one end in the winding axis direction, and each first component 11 is connected to the second conductive strip 13 at the other end in the winding axis direction; the second component strip 2 comprises a third conductive strip 22, a fourth conductive strip 23 and a plurality of second components 21, the plurality of second components 21 are sequentially arranged along the first direction A, the third conductive strip 22 and the fourth conductive strip 23 both extend along the first direction A, the winding axis direction of the second components 21 is perpendicular to the winding axis direction of the first components 11. The first and second elements 21 are parallel to each other, one end of each second element 21 in the direction of the winding axis is connected to the third conductive tape 22, and the other end of each second element 21 in the direction of the winding axis is connected to the fourth conductive tape 23; the first bus bar 3 and the second bus bar 4, along the first direction A, the first bus bar 3 and the second bus bar 4 are arranged on the same side or the opposite side of the first element strip 1 and the second element strip 2; wherein, along the winding axis direction of the first element 11 or the second element 21, the first conductive tape 12 is closer to the third conductive tape 22 than the fourth conductive tape 23, the first conductive tape 12 and the third conductive tape 22 have the same polarity and are both connected to the first bus bar 3, the second conductive tape 13 and the fourth conductive tape 23 have the same polarity and are both connected to the second bus bar 4, the second bus bar 4 is provided with a first connecting end 42, along the winding axis direction of the first element 11 or the second element 21, the first connecting end 42 is located between the second conductive tape 13 and the fourth conductive tape 23.

[0042] Specifically, along the first direction A, a plurality of first elements 11 are arranged in sequence, the first conductive tape 12 and the second conductive tape 13 both extend along the first direction A, and are respectively connected to each first element 11 at both ends of the winding axis direction of the first element 11, that is, the first conductive tape 12 and the second conductive tape 13 connect the plurality of first elements 11 in parallel to form a first element strip 1. Along the first direction A, a plurality of second elements 21 are arranged in sequence, the third conductive tape 22 and the fourth conductive tape 23 both extend along the first direction A, and are respectively connected to each second element 21 at both ends of the winding axis direction of the second element 21, that is, the third conductive tape 22 and the fourth conductive tape 23 connect the plurality of second elements 21 in parallel to form a second element strip 2. Exemplarily, the first element strip 1 and the second element strip 2 are arranged opposite to each other, the first element 11 can be arranged one-to-one with the second element 21, and the winding axis of the correspondingly arranged first element 11 coincides with the winding axis of the second element 21; or the number of the first element 11 and the second element 21 is different, and the winding axis of the first element 11 does not coincide with the winding axis of the second element 21; the first element 11 and the second element 21 can be arranged according to specific needs, and the present application is not limited thereto. The first conductive strip 12 connected to the plurality of first elements 11 and the third conductive strip 22 connected to the plurality of second elements 21 are close to each other, the first conductive strip 12 connected to the plurality of first elements 11 is far away from the fourth conductive strip 23 connected to the plurality of second elements 21, and the second conductive strip 13 connected to the plurality of first elements 11 and the fourth conductive strip 23 connected to the plurality of second elements 21 are far away from each other. The first conductive strip 12 and the third conductive strip 22 are connected to the first bus 3 by welding, and the second conductive strip 13 and the third conductive strip 22 are connected to the second bus 4 by welding. It should be understood that, since the first conductive tape 12 is close to the third conductive tape 22, the connection position of the first conductive tape 12 and the first bus 3 and the connection position of the third conductive tape 22 and the first bus 3 are close; since the second conductive tape 13 and the fourth conductive tape 23 are far away from each other, the connection position of the second conductive tape 13 and the second bus 4 and the connection position of the fourth conductive tape 23 and the second bus 4 are also far away from each other, that is, the second conductive tape 13 and the fourth conductive tape 23 are connected to the two sides of the second bus 4 along the winding axis direction of the first element 11 or the second element 21. The second bus 4 has a first connection end 42 on it, and along the winding axis direction of the first element 11 or the second element 21, the first connection end 42 is located between the second conductive tape 13 and the fourth conductive tape 23. The first bus 3 has a second connection end 32. Since the first conductive tape 12 and the third conductive tape 22 are close to each other, along the winding axis direction of the first element 11 or the second element 21, the second connection end 32 can be arranged between the first conductive tape 12 and the third conductive tape 22, or on a side close to the first conductive tape 12 and away from the third conductive tape 22, or on a side close to the third conductive tape 22 and away from the first conductive tape 12.

[0043] It should be understood that the first bus 3 and the second bus 4 can be arranged on the same side of the first component bar 1 and the second component bar 2 at the same time, or on different sides of the first component bar 1 and the second component bar 2, depending on the specific situation, and the present application is not limited to this.

[0044] In the low self-inductance capacitor proposed in the embodiment of the present application, each first element 11 is connected to the first conductive tape 12 and the second conductive tape 13 at both ends of its winding axis, and each second element 21 is connected to the third conductive tape 22 and the fourth conductive tape 23 at both ends of its winding axis; along the winding axis direction of the first element 11 or the second element 21, the first conductive tape 12 is close to the third conductive tape 22 and both are connected to the first bus 3 to form one pole of the capacitor, the second conductive tape 13 is far away from the third conductive tape 22, and the second conductive tape 13 and the fourth conductive tape 23 are both connected to the second bus 4 to form the other pole of the capacitor, that is, along the winding axis direction of the first element 11 or the second element 21, the second conductive tape 13 and the fourth conductive tape 23 are connected to the second bus 4 to form the other pole of the capacitor. Four conductive strips 23 are connected to opposite sides of the second bus 4; the second bus 4 has a first connection end 42, and along the winding axis direction of the first element 11 or the second element 21, the first connection end 42 is located between the second conductive strip 13 and the fourth conductive strip 23. When current is introduced into the second bus 4 from the first connection end 42, the current flows from the first connection end 42 to the second conductive strip 13 and the fourth conductive strip 23 respectively. The current flowing to the second conductive strip 13 and the current flowing to the fourth conductive strip 23 on the second bus 4 are in opposite directions. Therefore, the inductance generated by the current loop flowing to the second conductive strip 13 and the inductance generated by the current loop flowing to the fourth conductive strip 23 will offset a part, thereby reducing the self-inductance of the capacitor.

[0045] Furthermore, the first conductive tape 12 and the third conductive tape 22 can conduct the heat generated by the first element 11 and the second element 21 to the first bus 3; the second conductive tape 13 and the fourth conductive tape 23 can conduct the heat generated by the first element 11 and the second element 21 to the second bus 4. The first bus 3 and the second bus 4 with a larger area have good heat dissipation performance, which can assist the capacitor in dissipating heat, thereby reducing the thermal resistance of the capacitor, thereby achieving the purpose of reducing the heat generated by the capacitor.

[0046] In an optional embodiment, along the winding axis direction of the first element 11 or the second element 21, the first connection end 42 may be located near the midpoint between the second conductive tape 13 and the fourth conductive tape 23. When current is introduced from the first connection end 42 to the second busbar 4, the current flows from the first connection end 42 to the second conductive tape 13 and the fourth conductive tape 23, respectively. The current on the second busbar 4 flowing to the second conductive tape 13 and the current flowing to the fourth conductive tape 23 are in opposite directions. Therefore, the inductance generated by the current loop flowing to the second conductive tape 13 and the inductance generated by the current loop flowing to the fourth conductive tape 23 will offset a part, thereby reducing the self-inductance of the capacitor.

[0047] Optionally, refer to Figure 1 , along the winding axis direction of the first element 11 or the second element 21, the first connection end 42 is located at the midpoint between the second conductive belt 13 and the fourth conductive belt 23. When the current is introduced from the first connection end 42 to the second busbar 4, the current flows from the first connection end 42 to the second conductive belt 13 and the fourth conductive belt 23 respectively, and the current flowing to the second conductive belt 13 and the current flowing to the fourth conductive belt 23 on the second busbar 4 are in opposite directions, and the paths through which the current flows are equal. Therefore, the inductance generated by the current loop flowing to the second conductive belt 13 and the inductance generated by the current loop flowing to the fourth conductive belt 23 will cancel each other, thereby reducing the self-inductance of the capacitor.

[0048] Optionally, refer to Figure 1 , the first busbar 3 and the second busbar 4 are arranged on the same side of the first component bar 1 and the second component bar 2; along the first direction A, at least part of the second busbar 4 is located on the side of the first busbar 3 away from the first component bar 1 and the second component bar 2. The first busbar 3 and the second busbar 4 are arranged on the same side of the first component bar 1 and the second component bar 2, and along the first direction A, at least part of the projection of the second busbar 4 coincides with the first busbar 3. When current flows through the first busbar 3 and the second busbar 4, the inductance generated by the first busbar 3 and the inductance generated by the second busbar 4 will also cancel each other out, further reducing the self-inductance of the capacitor. In addition, the first busbar 3 and the second busbar 4 are arranged on the same side of the first component bar 1 and the second component bar 2, which effectively reduces the current path, thereby reducing the self-inductance and heat generated by the capacitor.

[0049] It should be understood that the first busbar 3 may have a first side away from the first component bar 1 and the second component bar 2, and a second side close to the first component bar 1 and the second component bar 2, wherein the first side is arranged opposite to the second side, and the first busbar 3 also has a third side and a fourth side connecting the first side and the second side. At least part of the second busbar 4 is arranged on the first side of the first busbar 3, which can be understood as that the second busbar 4 can be entirely arranged on the first side of the first busbar 3, or the second busbar 4 can have a part arranged on the first side of the first busbar 3, and also have a part arranged on the third side and / or the fourth side. There is a spacing between any part of the second busbar 4 and the first busbar 3, which prevents the first busbar 3 and the second busbar 4 from contacting, thereby reducing the risk of short circuit of the capacitor.

[0050] Optionally, refer to Figure 1 The second busbar 4 includes a first body portion 41, a second body portion 44 and a raised portion 43. The first body portion 41 is connected to the second conductive strip 13, and the second body portion 44 is connected to the fourth conductive strip 23. Along the winding axis direction of the first element 11 or the second element 21, the two ends of the raised portion 43 are respectively connected to the first body portion 41 and the second body portion 44; along the first direction A, at least part of the raised portion 43 is protruded toward a side away from the first element strip 1 and the second element strip 2 compared to the first body portion 41 and the second body portion 44, so as to form a receiving cavity 431 for accommodating the first busbar 3. The second busbar 4 has a raised portion 43, and the first busbar 3 is correspondingly arranged with the raised portion 43. A part of the raised portion 43 or the whole raised portion 43 is protruded toward the direction of the first busbar 3, which increases the distance between the first busbar 3 and the second busbar 4, so that an insulation distance is formed between the first busbar 3 and the raised portion 43, and the risk of short circuit of the capacitor is reduced. It should be understood that there is also an insulation distance between the main body 41 of the second busbar 4 and the first busbar 3 .

[0051] Optionally, refer to Figure 1 The ridge 43 is provided with an avoidance hole 432, and the avoidance hole 432 penetrates the ridge 43 along the thickness direction of the ridge 43. Specifically, the first busbar 3 has a second connection end 32, the second connection end 32 protrudes from the first side of the first busbar 3 away from the first element 11 and the second element 21, and the second connection end 32 passes through the avoidance hole 432 to be connected to the first terminal 8, so as to facilitate the introduction or extraction of current on the first busbar 3.

[0052] Optionally, refer to Figure 1 The raised portion 43 includes a top wall 433, a first side wall 434 and a second side wall 435; along the first direction A, the top wall 433 is separated from the first bus 3, the first side wall 434 is connected to one side of the top wall 433 and the first main body portion 41, and the second side wall 435 is connected to the other side of the top wall 433 and the second main body portion 44.

[0053] Specifically, the body portion 41 of the second busbar 4 has a first body portion 41 connected to the second conductive strip 13 and a second body portion 41 connected to the fourth conductive strip 23. Along the first direction A, the first side wall 434 is connected between the side of the top wall 433 close to the second conductive strip 13 and the first body portion 41, and the second side wall 435 is connected between the side of the top wall 433 close to the fourth conductive strip 23 and the second body portion 41. In other words, along the winding axis direction of the first element 11 or the second element 21, the first side wall 434 is connected to the opposite sides of the top wall 433 to form an accommodating cavity 431, the first busbar 3 corresponds to the accommodating cavity 431, and the first busbar 3 is spaced apart from the top wall 433, the first side wall 434 and the second side wall 435 to form an insulation distance.

[0054] Optionally, the minimum distance between the top wall 433 and the first bus bar 3 is 3-10 mm along the first direction A. A distance of at least 3-10 mm is reserved between the top wall 433 and the first bus bar 3 along the first direction A to reduce the contact between the first bus bar 3 and the second bus bar 4, thereby reducing the risk of short circuit caused by the connection between the first bus bar 3 and the second bus bar 4.

[0055] Optionally, refer to Figure 1 and Figure 2 Along the first direction A, the ends of the first conductive tape 12 and the third conductive tape 22 on the same side pass through the first bus 3 and overlap with the first bus 3 in the thickness direction; the ends of the second conductive tape 13 and the fourth conductive tape 23 on the same side overlap with the second bus 4 in the thickness direction. The first conductive tape 12 and the third conductive tape 22 are overlapped with the first bus 3 to form one pole of the capacitor, and the second conductive tape 13 and the third conductive tape 22 are overlapped with the second bus 4 to form the other pole of the capacitor. The current is introduced through the first connection end 42 of the second bus 4, and then flows to the second conductive tape 13 and the fourth conductive tape 23 respectively. The two currents on the second bus 4 are in opposite directions, and the generated inductances cancel each other out; one current flows through the first element 11 and then flows into the first bus 3 through the first conductive tape 12, and the other current flows through the second element 21 and then flows into the first bus 3 through the third conductive tape 22, and then flows out from the first bus 3. The current on the first bus 3 is in opposite directions to the current at the corresponding position on the second bus 4, and the inductances generated by each other can also cancel each other out, thereby achieving the effect of reducing the self-inductance of the capacitor.

[0056] In an alternative embodiment, reference Figure 2The first busbar 3 has a through hole, and the first conductive strip 12 connected to the first element 11 and the third conductive strip 22 connected to the second element 21 pass through the through hole and overlap the first busbar 3. The first busbar 3 has a second connection terminal 32, which is arranged at a position close to the through hole to reduce the path of the current on the first busbar 3, thereby reducing the inductance generated by the first busbar 3.

[0057] In another optional embodiment, the first busbar 3 has two through holes, the first conductive strip 12 connected to the first element 11 passes through one through hole, the third conductive strip 22 connected to the second element 21 passes through the other through hole, and the second connection end 32 is arranged between the two through holes. Optionally, the position of the second connection end 32 is close to both through holes, that is, the position of the second connection end 32 is close to the first conductive strip 12 and the third conductive strip 22, so that the distance between the first conductive strip 12 and the third conductive strip 22 and the second connection end 32 can be ignored, thereby reducing the current path between the first conductive strip 12 and the third conductive strip 22 to the second connection end 32, thereby reducing the inductance generated by the first busbar 3. Optionally, there is a spacing between the first conductive strip 12 and the second connection end 32 and between the third conductive strip 2 and the second connection end 32, the direction of the current generated from the first conductive strip 12 to the second connection end 32 is opposite to the direction of the current generated from the third conductive strip 22 to the second connection end 32, the generated inductances can offset each other, and the inductance generated by the first busbar 3 can also be reduced.

[0058] Optionally, there are multiple first element bars 1 and multiple second element bars 2, and each first element bar 1 is arranged opposite to the corresponding second element bar 2 along the winding axis direction of the first element 11 or the second element 21; multiple first element bars 1 are arranged in sequence along the second direction B, and multiple second element bars 2 are arranged in sequence along the second direction B, and the first direction A, the second direction B and the winding axis direction of the first element 11 or the second element 21 are perpendicular to each other. After multiple first element bars 1 are connected in parallel and multiple second element bars 2 are connected in parallel, the first element bars 1 as a whole form a first element group, and the second element bars 2 as a whole form a second element group. The first element group and the second element group are connected in parallel. After the first element group and the second element group are connected in parallel, the equivalent series resistance of the capacitor can be reduced, thereby reducing the heat generation of the capacitor. In addition, the flow area of ​​the first bus 3 and the second bus 4 is large, and the corresponding equivalent series resistance is low, thereby reducing the equivalent series resistance of the entire capacitor.

[0059] It should be understood that each first component strip 1 is connected to the first conductive strip 12 and the second conductive strip 13 , and each second component strip 2 is connected to the third conductive strip 22 and the fourth conductive strip 23 .

[0060] Optionally, the capacitor further includes a first connection belt 5, a second connection belt, a third connection belt and a fourth connection belt, wherein the first connection belt 5 is respectively connected to the plurality of first conductive belts 12, the second connection belt is respectively connected to the plurality of second conductive belts 13, the third connection belt is respectively connected to the plurality of third conductive belts 22, and the fourth connection belt is respectively connected to the plurality of fourth conductive belts 23. The first connection belt 5 and the second connection belt are used to connect the plurality of first component strips 1 in parallel, the third connection belt and the fourth connection belt are used to connect the plurality of second component strips 2 in parallel, and the plurality of first component strips 1 connected in parallel to the plurality of second component strips 2 connected in parallel are connected in parallel to reduce the equivalent series resistance of the capacitor, thereby reducing the heat generation of the capacitor.

[0061] Optionally, refer to Figure 1 and Figure 2 , the first connecting belt 5, the second connecting belt, the third connecting belt and the fourth connecting belt are all multiple, the multiple first connecting belts 5 are arranged at intervals along the first direction A, the multiple second connecting belts are arranged at intervals along the first direction A, the multiple third connecting belts are arranged at intervals along the first direction A, and the multiple fourth connecting belts are arranged at intervals along the first direction A. Among them, the second connecting belt, the third connecting belt and the fourth connecting belt are not shown in the figure. The first connecting belt 5 and the second connecting belt are both multiple, which can play a role in heat dissipation while connecting multiple first component strips 1 in parallel; the third connecting belt and the fourth connecting belt are both multiple, which can play a role in heat dissipation while connecting multiple second component strips 2 in parallel, thereby improving the heat dissipation efficiency of the capacitor.

[0062] It should be understood that the first conductive tape 12 needs to be connected to all the first elements 11, the first connecting tape 5 can be connected to all the first conductive tapes 12, and there can be multiple layers of first connecting tapes 5, and each layer can also have multiple first connecting tapes 5; the first connecting tape 5 may not be connected to all the first conductive tapes 12, and the length of the first connecting tape 5 can also be determined according to specific circumstances. The second connecting tape, the third connecting tape and the fourth connecting tape are similar, and will not be described here.

[0063] Optionally, refer to Figures 5 to 7The capacitor further includes a housing 6, an end cap 7, a first terminal 8 and a second terminal 9. The housing 6 has a space for accommodating the first element bar 1, the second element bar 2, the first bus bar 3 and the second bus bar 4. The housing 6 has an opening along the first direction A. The end cap 7 is connected to the housing 6 to close the opening. The first terminal 8 passes through the end cap 7 to connect with the first bus bar 3, and the second terminal 9 passes through the end cap 7 to connect with the second bus bar 4. The first element 11 and the second element 21 are wound by a metallized polypropylene film using a non-inductive winding method. The axial length of the first element 11 and the second element 21 is relatively short, so that the current path is short, so that the self-inductance and equivalent series resistance of a single element are relatively low. A plurality of first elements 11 are connected in parallel through the first conductive tape 12 and the second conductive tape 13 to form a first element bar 1, a plurality of second elements 21 are connected in parallel through the third conductive tape 22 and the fourth conductive tape 23 to form a second element bar 2, and then a plurality of first element bars 1 and a plurality of second element bars 2 are connected in parallel and wrapped with insulating paper 61, and then placed in a housing 6, and the plurality of first element bars 1 and second element bars 2 are enclosed in the housing 6 through an end cap 7. The housing 6 protects the first element bars 1 and the second element bars 2 to reduce damage to the first element bars 1 and the second element bars 2. The first terminal 8 passes through the end cap 7 and is connected to the first bus 3 through the second connecting end 32, and the second terminal 9 passes through the end cap 7 and is connected to the second bus 4 through the first connecting end 42. The first terminal 8 is connected to the first bus 3 to form one pole of the capacitor, and the second terminal 9 is connected to the second bus 4 to form the other pole of the capacitor.

[0064] Specifically, the first busbar 3 has a plurality of second connection ends 32, the second busbar 4 has a plurality of first connection ends 42, and the capacitor further has a plurality of first terminals 8 connected to the second connection ends 32 and a plurality of second terminals 9 connected to the first connection ends 42. Among them, the first connection end 42 protrudes from the first busbar 3 and passes through the avoidance hole 432 of the second busbar 4 to connect with the first terminal 8, forming one pole of the capacitor, and the second connection end 32 protrudes from the second busbar 4 to connect with the second terminal 9, forming the second pole of the capacitor. Providing multiple pairs of first terminals 8 and second terminals 9 can meet the requirements of large currents and reduce the heat generated by a single pair of first terminals 8 and second terminals 9.

[0065] The low self-inductance capacitor in the present application includes a plurality of first component strips 1 and a plurality of second component strips 2 arranged in parallel, a first busbar 3 and a second busbar 4 arranged along a first direction A, an end cap 7, a housing 6, a first terminal 8 and a second terminal 9, and a potting material. Among them, the first conductive strip 12, the second conductive strip 13, the third conductive strip 22 and the fourth conductive strip 23 in the present application and the first connecting strip 5, the second connecting strip, the third connecting strip and the fourth connecting strip are all copper strips. Among them, along the winding axis direction of the first element 11, the two ends of the first element 11 have core rods, the core rods are insulating parts, the first conductive belt 12 and the second conductive belt 13 both have through-hole structures and welding pins, the core rods at the two ends of the first element 11 respectively cooperate with the through-hole structure of the first conductive belt 12 and the through-hole structure of the second conductive belt 13 to position the first element 11, and the two ends of the first element 11 are respectively welded to the welding pins of the first conductive belt 12 and the welding pins of the second conductive belt, which can reduce welding stress and reduce the risk of desoldering; along the winding axis direction of the second element 21, the two ends of the second element 21 have core rods, the core rods are insulating parts, the third conductive belt 22 and the fourth conductive belt 23 both have through-hole structures and welding pins, the two ends of the second element 21 respectively cooperate with the through-hole structure of the third conductive belt 22 and the through-hole structure of the fourth conductive belt 23 to position the second element 21, and the two ends of the second element 21 are respectively welded to the welding pins of the third conductive belt 22 and the welding pins of the fourth conductive belt 23, which can reduce welding stress and reduce the risk of desoldering.

[0066] Arrange multiple first elements 11 side by side, and the first conductive tape 12 and the second conductive tape 13 are respectively covered on the gold-sprayed surfaces at both ends of the first element 11. The welding pins of the first conductive tape 12 and the welding pins of the second conductive tape 13 are respectively connected to the gold-sprayed surfaces at both ends of the first element 11 by soldering or high-current welding. The copper tape can be one layer or multiple layers. The first layer of copper tape must connect all the elements. The first layer of copper tape is the first conductive tape 12 and the second conductive tape 13. The first conductive tape 12 and the second conductive tape 13 must connect all the first elements 11. The length of the second layer and above of the copper tape can be shortened according to actual working conditions. The second layer and above of the copper tape are the first connecting tape 5 and the second connecting tape. The copper tape is fixed to the gold-sprayed surfaces of multiple first elements 11 by welding to form a first element strip 1, and the two end faces of the first element strip 1 are respectively used as two poles.

[0067] Arrange multiple second elements 21 side by side, and the third conductive tape 22 and the fourth conductive tape 23 are respectively covered on the gold-sprayed surfaces at both ends of the second element 21. The welding pins of the third conductive tape 22 and the welding pins of the fourth conductive tape 23 are respectively connected to the gold-sprayed surfaces at both ends of the second element 21 by soldering or high-current welding. The copper tape can be one layer or multiple layers. Except for the first layer of copper tape, which must connect all elements, the first layer of copper tape is the third conductive tape 22 and the fourth conductive tape 23. The third conductive tape 22 and the fourth conductive tape 23 must connect all second elements 21. The length of the second layer and above of the copper tape can be shortened according to actual working conditions. The second layer and above of the copper tape are the third connecting tape and the fourth connecting tape. The copper tape is fixed to the gold-sprayed surfaces of the multiple second elements 21 by welding to form a second element strip 2, and the two end faces of the second element strip 2 are respectively used as two poles. Multiple first element strips 1 are then connected by copper tape to form a first element group, wherein the copper tape can be one layer or multiple layers, and the two end faces of the first element group are respectively used as two poles. A plurality of second component strips 2 are then connected by copper strips to form a second component group, wherein the copper strips may be one layer or multiple layers, and the two end faces of the second component group are respectively used as two poles. The first component group and the second component group are placed side by side and opposite to each other, and the first conductive strip 12 of the first component group and the third conductive strip 22 of the second component group are led out from the through hole reserved in the first bus 3, and fixed on the surface of the first bus 3 by welding to form one pole; then the second conductive strip 13 of the first component group and the second component group and the fourth conductive strip 23 are covered on the second bus 4 to form another pole. The second bus 4 is located above the first bus 3, and an insulation distance is left between the two. It should be understood that, except for the differences caused by welding and insulation factors, the main areas of the first bus 3 and the second bus 4 are basically overlapped. Preferably, the first bus 3 and the second bus 4 partially overlap in the conductive area.

[0068] The first terminal 8 and the second terminal 9 are connected to the first bus 3 and the second bus 4 respectively, forming the two poles of the capacitor. When the capacitor is working, the current flows in from the second electrode terminal 9, and when passing through the second bus 4, the current is shunted from the middle of the second bus 4 to the second conductive belt 13 and the fourth conductive belt 23 on both sides, and the current direction is opposite, which offsets part of the inductance; the current path in the first bus 3 and the second bus 4, the first component group and the second component group is shorter, thereby reducing the self-inductance of the capacitor.

[0069] The first component group and the second component group use more components. The large number of components connected in parallel reduces the equivalent series resistance of the first component group and the second component group. The flow areas of the first busbar 3 and the second busbar 4 are both large, and the corresponding equivalent series resistance is low, so that after the first busbar 3 and the second busbar 4 are combined with the first component group and the second component group, the equivalent series resistance of the capacitor as a whole is low. The copper strip connected to the first component group and the second component group conducts the self-heating of a part of the components to the first busbar 3 and the second busbar 4. The large area of ​​the first busbar 3 and the second busbar 4 provides good heat dissipation, thereby optimizing the heat dissipation path of the capacitor as a whole and reducing the thermal resistance. By reducing the equivalent series resistance and thermal resistance, the capacitor achieves the effect of low temperature rise.

[0070] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0071] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0072] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

[0073] Although the embodiments of the present application have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A low self-inductance capacitor for a flexible DC converter valve, characterized in that: include: A first component strip, comprising a first conductive strip, a second conductive strip and a plurality of first components, wherein the plurality of first components are sequentially arranged along a first direction, wherein the first conductive strip and the second conductive strip both extend along the first direction, wherein the first direction is perpendicular to a winding axis direction of the first components, wherein one end of each of the first components in the winding axis direction is connected to the first conductive strip, and the other end of each of the first components in the winding axis direction is connected to the second conductive strip; A second element strip, comprising a third conductive strip, a fourth conductive strip and a plurality of second elements, wherein the plurality of second elements are sequentially arranged along the first direction, the third conductive strip and the fourth conductive strip both extend along the first direction, a winding axis direction of the second element is parallel to a winding axis direction of the first element, each of the second elements is connected to the third conductive strip at one end in the direction of its winding axis, and each of the second elements is connected to the fourth conductive strip at the other end in the direction of its winding axis; A first busbar and a second busbar, wherein the first busbar and the second busbar are arranged on the same side or different sides of the first element bar and the second element bar along the first direction; Among them, along the winding axis direction of the first element or the second element, the first conductive tape is closer to the third conductive tape than the fourth conductive tape, the first conductive tape and the third conductive tape have the same polarity and are both connected to the first bus, the second conductive tape and the fourth conductive tape have the same polarity and are both connected to the second bus, the second bus is provided with a first connecting end, and along the winding axis direction of the first element or the second element, the first connecting end is located between the second conductive tape and the fourth conductive tape.

2. The low self-inductance capacitor according to claim 1, characterized in that: The first busbar and the second busbar are arranged on the same side of the first element bar and the second element bar; Along the first direction, at least a portion of the second busbar is located on a side of the first busbar away from the first component strip and the second component strip.

3. The low self-inductance capacitor according to claim 2, characterized in that: The second busbar comprises a first body portion, a second body portion and a raised portion, the first body portion is connected to the second conductive strip, the second body portion is connected to the fourth conductive strip, and along the winding axis direction of the first element or the second element, two ends of the raised portion are respectively connected to the first body portion and the second body portion; Along the first direction, at least a portion of the raised portion protrudes toward a side away from the first element bar and the second element bar compared to the first body portion and the second body portion to form an accommodating cavity for accommodating the first busbar.

4. The low self-inductance capacitor according to claim 3, characterized in that: The raised portion is provided with an escape hole, and the escape hole penetrates the raised portion along the thickness direction of the raised portion.

5. The low self-inductance capacitor according to claim 4, characterized in that: The raised portion includes a top wall, a first side wall, and a second side wall; Along the first direction, the top wall is spaced apart from the first bus bar, the first side wall is respectively connected to the top wall and the first body portion, and the second side wall is respectively connected to the top wall and the second body portion.

6. The low self-inductance capacitor according to claim 5, characterized in that: Along the first direction, a minimum distance between the top wall and the first bus bar is 3-10 mm.

7. The low self-inductance capacitor according to claim 1, characterized in that: Along the first direction, the first conductive strip and the third conductive strip have the same side ends thereof penetrated by the first bus bar and overlapped with the first bus bar in the thickness direction; The ends of the second conductive tape and the fourth conductive tape on the same side overlap the second busbar in the thickness direction.

8. The low self-inductance capacitor according to claim 1, characterized in that: There are multiple first element bars and multiple second element bars, and each of the first element bars is arranged opposite to the corresponding second element bar along the winding axis direction of the first element or the second element; A plurality of the first element strips are arranged in sequence along the second direction, and a plurality of the second element strips are arranged in sequence along the second direction. The first direction, the second direction and the winding axis direction of the first element or the second element are perpendicular to each other.

9. The low self-inductance capacitor according to claim 8, characterized in that: The capacitor also includes a first connecting band, a second connecting band, a third connecting band and a fourth connecting band, the first connecting band is respectively connected to multiple first conductive bands, the second connecting band is respectively connected to multiple second conductive bands, the third connecting band is respectively connected to multiple third conductive bands, and the fourth connecting band is respectively connected to multiple fourth conductive bands.

10. The low self-inductance capacitor according to claim 9, characterized in that: There are multiple first connecting belts, multiple second connecting belts, multiple third connecting belts and multiple fourth connecting belts, multiple first connecting belts are arranged at intervals along the first direction, multiple second connecting belts are arranged at intervals along the first direction, multiple third connecting belts are arranged at intervals along the first direction, and multiple fourth connecting belts are arranged at intervals along the first direction.

11. The low self-inductance capacitor according to claim 1, characterized in that: The capacitor further comprises: A housing, wherein the housing has a receiving space for receiving the first component bar, the second component bar, the first bus bar, and the second bus bar, and the housing has an opening along the first direction; an end cover connected to the housing to close the opening; A first terminal and a second terminal, wherein the first terminal passes through the end cover to be connected to the first bus bar, and the second terminal passes through the end cover to be connected to the second bus bar.

12. The low self-inductance capacitor according to claim 1, characterized in that: Along the winding axis direction of the first element or the second element, the first connection end is located at the midpoint between the second conductive tape and the fourth conductive tape.

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