Bus capacitor

Abstract

The utility model relates to a bus capacitor, which comprises a shell and a capacitor main body, the shell comprises a first shell wall, a second shell wall and a circumferential vertical wall, the first shell wall, the second shell wall and the circumferential vertical wall enclose an encapsulation cavity for accommodating the capacitor main body, and the capacitor main body comprises a first busbar, a second busbar, a capacitor core, a core positive plate and a core negative plate. The capacitor core is arranged between the first busbar and the second busbar, the positive electrode and the core positive plate of the capacitor core are connected with the first busbar, the negative electrode and the core negative plate of the capacitor core are connected with the second busbar, and at least part of the core positive plate and the core negative plate penetrate through the shell to extend out. The bus capacitor can dissipate heat through contact between one busbar and the shell wall, and can also dissipate heat through the core positive plate and the core negative plate which are exposed outside the shell, so that the heat dissipation area of the busbar is increased, the heat dissipation efficiency of the busbar is improved, the internal temperature of the bus capacitor is reduced, and the service life of the bus capacitor is prolonged. Therefore, the stability and the service life of the bus capacitor are ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electrical equipment, especially relates to a bus capacitor. BACKGROUND

[0002] The bus capacitor is widely applied to motor controller, frequency converter, inverter and other power electronic equipment, and the service life of the bus capacitor is influenced by various factors, mainly including service temperature, voltage grade and the like, that is, the service life of the bus capacitor will be shortened under high temperature environment, and the bus capacitor generates large heat in the working process of the power electronic equipment, which can cause the internal temperature of the bus capacitor to rise, so how to strengthen the heat dissipation of the bus capacitor becomes an important technical problem to be solved by the person skilled in the art. SUMMARY

[0003] The utility model discloses a bus capacitor to improve the heat dissipation capacity of the internal bus bar, reduce the internal temperature, and thus guarantee the stability and service life of the bus capacitor.

[0004] To achieve the above object, the utility model provides the following technical scheme:

[0005] A bus capacitor comprises:

[0006] A shell comprises a first shell wall, a second shell wall and a circumferential vertical wall, the first shell wall and the second shell wall are arranged at intervals, the circumferential vertical wall is arranged between the first shell wall and the second shell wall, and the first shell wall, the second shell wall and the circumferential vertical wall enclose a filling cavity;

[0007] A capacitor main body is arranged in the filling cavity, the capacitor main body comprises a first bus bar, a second bus bar, a capacitor core, a core positive plate and a core negative plate, the first bus bar and the second bus bar are arranged at intervals and are insulated from each other, the capacitor core is arranged between the first bus bar and the second bus bar, the positive pole of the capacitor core is connected with the first bus bar, the negative pole of the capacitor core is connected with the second bus bar, the core positive plate is connected with the first bus bar, the core negative plate is connected with the second bus bar, and the core positive plate and the core negative plate at least partially extend out of the shell.

[0008] In an embodiment of the application, the core positive plate and the core negative plate at least partially satisfy the parallel condition relative to the circumferential vertical wall.

[0009] In an embodiment of the present application, the core positive plate and the core negative plate comprise parallel extending parts and bent connecting parts, the parallel extending parts satisfy a parallel condition relative to the circumferential vertical wall, and the bent connecting parts are used to connect two adjacent parallel extending parts to form a zigzag structure, or the bent connecting parts are used to connect the parallel extending part close to the circumferential vertical wall to the first busbar or the second busbar.

[0010] In an embodiment of the present application, the core positive plate and the core negative plate are provided with heat dissipation holes.

[0011] In an embodiment of the present application, the capacitor body further comprises an input positive plate, an input negative plate, an output positive plate and an output negative plate, the input positive plate and the output positive plate are connected with the first busbar respectively, the input negative plate and the output negative plate are connected with the second busbar respectively, and the input positive plate, the input negative plate, the output positive plate and the output negative plate at least partially extend out of the shell.

[0012] In an embodiment of the present application, the input positive plate and the input negative plate are in L shape, the longitudinal part of the input positive plate is connected with the first busbar, the longitudinal part of the input negative plate is connected with the second busbar, and the transverse part of the input positive plate is flush with the transverse part of the input negative plate.

[0013] In an embodiment of the present application, the output positive plate and the output negative plate are in a laminated structure formed by zigzag bending, and the output positive plate and the output negative plate are insulated by an insulating separator.

[0014] In an embodiment of the present application, the first shell wall is provided with a potting hole communicating with the potting cavity, and one of the first busbar and the second busbar towards the first shell wall is provided with a plurality of through holes.

[0015] In an embodiment of the present application, the first busbar and the second busbar are respectively provided with a connecting structure for electrical connection with the capacitor core, the connecting structure comprises a hollow hole and a contact piece, one end of the contact piece is connected to the hole wall of the hollow hole, and the other end of the contact piece extends to the center of the hollow hole along the radial direction of the hollow hole.

[0016] In an embodiment of the present application, the outer wall surface of the circumferential vertical wall of the shell is provided with a reinforcing structure, the reinforcing structure comprises longitudinal reinforcing ribs and transverse reinforcing ribs, the longitudinal reinforcing ribs extend from the first shell wall to the second shell wall, a plurality of the longitudinal reinforcing ribs are arranged at intervals, and the transverse reinforcing ribs are arranged between two adjacent longitudinal reinforcing ribs.

[0017] It can be seen from the above technical scheme that the utility model discloses a bus capacitor, and the bus capacitor comprises a shell and a capacitor main body, wherein the shell comprises a first shell wall, a second shell wall and a circumferential vertical wall, the first shell wall and the second shell wall are arranged at intervals, the circumferential vertical wall is arranged between the first shell wall and the second shell wall, the first shell wall, the second shell wall and the circumferential vertical wall enclose a pouring cavity, the capacitor main body is arranged in the pouring cavity, the capacitor main body comprises a first busbar, a second busbar, a capacitor core, a core positive plate and a core negative plate, the first busbar and the second busbar are arranged at intervals and are mutually insulated, the capacitor core is arranged between the first busbar and the second busbar, the positive pole of the capacitor core is connected with the first busbar, the negative pole of the capacitor core is connected with the second busbar, the core positive plate is connected with the first busbar, the core negative plate is connected with the second busbar, and the core positive plate and the core negative plate at least partially extend out of the shell.

[0018] One of the first shell wall and the second shell wall of the above bus capacitor is a pouring surface side and a pouring surface opposite side, during packaging, the capacitor main body is arranged in the shell, the core positive plate and the core negative plate at least partially extend out of the shell, one of the first busbar and the second busbar is in contact with the pouring surface opposite side, that is, one of the first busbar and the second busbar is in contact with the first shell wall or the second shell wall, then the packaging material is poured into the shell, and the packaging is completed after the packaging material solidifies, so that during the operation of the bus capacitor, heat dissipation can be realized through the contact between one of the busbars and the shell wall, and heat dissipation can also be realized through the core positive plate and the core negative plate exposed outside the shell, thereby increasing the heat dissipation area of the busbar, improving the heat dissipation efficiency of the busbar, reducing the internal temperature of the bus capacitor, and thereby ensuring the stability and service life of the bus capacitor. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can also be obtained according to these drawings without creative labor for those skilled in the art.

[0020] Figure 1 The structural schematic diagram of the bus capacitor provided by the embodiments of the utility model is shown in the figure.

[0021] Figure 2 The structural schematic diagram of the capacitor main body of the bus capacitor provided by the embodiments of the utility model is shown in the figure.

[0022] In the figure:

[0023] 1 is a shell;101 is a first shell wall;102 is a second shell wall;103 is a circumferential vertical wall;104 is a longitudinal reinforcing rib;105 is a transverse reinforcing rib;101a is a pouring hole;

[0024] 2 is a capacitor body; 201 is a core positive plate; 202 is a core negative plate; 203 is an input positive plate; 204 is an input negative plate; 205 is an output positive plate; 206 is an output negative plate; 207 is a first busbar; 208 is a second busbar; 209 is a capacitor core; 210 is a heat dissipation hole; 211 is a through hole; 212 is a hollow hole; 213 is a contact piece. DETAILED DESCRIPTION

[0025] The core of the utility model provides a bus capacitor, the structural design of this bus capacitor can improve its heat dissipation capacity to internal busbar, reduce internal temperature, thereby guarantee the stability and service life of bus capacitor.

[0026] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0027] Please refer to Figure 1 And Figure 2 , Figure 1 The structural schematic diagram of the bus capacitor provided by the embodiments of the utility model, Figure 2 The structural schematic diagram of the capacitor body of the bus capacitor provided by the embodiments of the utility model.

[0028] The utility model discloses a bus capacitor, the bus capacitor includes casing 1 and capacitor body 2.

[0029] Among them, the casing 1 includes first shell wall 101, second shell wall 102 and circumferential vertical wall 103, first shell wall 101 and second shell wall 102 are arranged at intervals, circumferential vertical wall 103 is arranged between first shell wall 101 and second shell wall 102, first shell wall 101, second shell wall 102 and circumferential vertical wall 103 enclose the potting cavity, in the application embodiment, the casing 1 is made of polyphenylene sulfide (PPS) material, which has the advantages of hard and brittle, high crystallinity, difficult to burn, good thermal stability, high mechanical strength, excellent electrical properties and the like, which can provide good protection and support fixing effect for the internal capacitor body 2.

[0030] The capacitor main body 2 is arranged in the pouring cavity, is fixed in the pouring cavity by pouring material, and comprises a first busbar 207, a second busbar 208, a capacitor core 209, a core positive plate 201 and a core negative plate 202. The first busbar 207, the second busbar 208, the core positive plate 201 and the core negative plate 202 are made of a material with good conductivity, and in the application, the first busbar 207, the second busbar 208, the core positive plate 201 and the core negative plate 202 are all copper bars. The first busbar 207, the second busbar 208, the core positive plate 201 and the core negative plate 202 are integrally formed, the first busbar 207 and the second busbar 208 are arranged in insulation and are spaced apart from each other, a containing space for the capacitor core 209 is formed between the first busbar 207 and the second busbar 208, the capacitor core 209 is arranged in the containing space between the first busbar 207 and the second busbar 208, the positive pole of the capacitor core 209 is connected with the first busbar 207, the negative pole of the capacitor core 209 is connected with the second busbar 208, the core positive plate 201 is connected with the first busbar 207, and the core negative plate 202 is connected with the second busbar 208. The core positive plate 201 at least partially penetrates through the shell 1 and extends out of the shell 1, and the core negative plate 202 at least partially penetrates through the shell 1 and extends out of the shell 1.

[0031] Compared with the prior art, one of the first shell wall 101 and the second shell wall 102 of the bus capacitor provided in the embodiment of the utility model is the pouring surface side and the pouring surface opposite side. During packaging, the capacitor main body 2 is arranged in the shell 1, the core positive plate 201 and the core negative plate 202 at least partially penetrate through the shell 1 and extend out of the shell 1, one of the first busbar 207 and the second busbar 208 contacts the pouring surface opposite side, that is, one of the first busbar 207 and the second busbar 208 contacts the first shell wall 101 or the second shell wall 102, then the packaging material is poured into the shell 1, and the packaging is completed after the packaging material solidifies. In this way, during the operation of the bus capacitor, heat dissipation can be realized through the contact between one of the busbars and the shell wall, and heat dissipation can also be realized through the core positive plate 201 and the core negative plate 202 exposed outside the shell 1, so that the heat dissipation area of the busbar is increased, the heat dissipation efficiency of the busbar is improved, the internal temperature of the bus capacitor is reduced, and the stability and service life of the bus capacitor are ensured.

[0032] In order to reduce the space occupation and make the structure of the bus capacitor more compact, in one embodiment of the application, as shown in Figure 1 and Figure 2As shown, the core positive plate 201 and the core negative plate 202 at least partially satisfy the parallel condition with respect to the circumferential vertical wall 103, that is, the core positive plate 201 and the core negative plate 202 are at least partially parallel to the circumferential vertical wall 103, or approximately parallel to the circumferential vertical wall 103. Of course, in other embodiments, the structure of the core positive plate 201 and the core negative plate 202 can be adjusted according to the internal heat dissipation structure of the power electronic device using the bus capacitor, such as the arrangement of cooling water channels, which is not limited here.

[0033] Specifically, such as Figure 2 As shown, in one embodiment of this application, the core positive electrode plate 201 and the core negative electrode plate 202 include parallel extension portions and bent connecting portions. The parallel extension portions satisfy the parallel condition relative to the circumferential vertical wall 103. One or more parallel extension portions are provided. When multiple parallel extension portions are provided, the bent connecting portion is used to connect two adjacent parallel extension portions to form a tortuous structure. The bent connecting portion is used to connect the parallel extension portion near the circumferential vertical wall 103 to the first busbar 207 or the second busbar 208. Alternatively, when only one parallel extension portion is provided, the bent connecting portion is used to connect the parallel extension portion near the circumferential vertical wall 103 to the first busbar 207 or the second busbar 208.

[0034] like Figure 2 As shown, the core positive electrode plate 201 includes a first parallel extension and a first bent connecting portion. The first bent connecting portion connects one end of the first parallel extension to the first busbar 207, and the core negative electrode plate 202 is connected to the second busbar 208. To facilitate installation, the portions of the core negative electrode plate 202 and the core positive electrode plate 201 extending out of the housing 1 extend in the same direction. Figure 2 In the embodiment shown, the core negative electrode plate 202 includes two second parallel extensions and two second bent connecting portions. One end of one of the second parallel extensions is connected to the second busbar 208 through the second bent connecting portion, and the other end of the second parallel extension extends toward the first busbar 207 and is connected to the other second parallel extension through the other second bent connecting portion.

[0035] To further improve heat dissipation efficiency, in one embodiment of this application, such as Figure 1 and Figure 2 As shown, the core positive plate 201 and the core negative plate 202 are provided with heat dissipation holes 210 to increase the heat dissipation surface area, and the number of heat dissipation holes 210 on the core positive plate 201 and the core negative plate 202 is not less than 5.

[0036] like Figure 2As shown in the embodiment of the present application, in addition to the core positive plate 201 and the core negative plate 202, the capacitor main body 2 also includes an input positive plate 203, an input negative plate 204, an output positive plate 205, and an output negative plate 206. The input positive plate 203 and the output positive plate 205 are connected with the first busbar 207, and the input negative plate 204 and the output negative plate 206 are connected with the second busbar 208. The input positive plate 203, the input negative plate 204, the output positive plate 205, and the output negative plate 206 at least partially extend out of the shell 1, as shown in the figure. Figure 1 As shown in the figure.

[0037] Specifically, as shown in the figure, in the present application, the input positive plate 203 and the input negative plate 204 are in L shape. The longitudinal part of the input positive plate 203 is connected with the first busbar 207, and the longitudinal part of the input negative plate 204 is connected with the second busbar 208. The transverse part of the input positive plate 203 is flush with the transverse part of the input negative plate 204, so that the transverse part of the input positive plate 203 and the transverse part of the input negative plate 204 extend in the same direction, facilitating subsequent installation. Figure 2 As can be seen from the figure, in order to facilitate the connection with the input positive plate 203 and the input negative plate 204, the edge of the first busbar 207 is provided with a first flange extending towards the second busbar 208. Correspondingly, the edge of the second busbar 208 is provided with a second flange extending towards the first busbar 207. The input positive plate 203 is connected to the first flange of the first busbar 207, and the input negative plate 204 is connected to the second flange of the second busbar 208. Figure 2 As shown in the figure, in the present application, the output positive plate 205 and the output negative plate 206 are in a staggered structure formed by bending. The output positive plate 205 and the output negative plate 206 are insulated by an insulating partition, which is a PET insulating layer arranged between the output positive plate 205 and the output negative plate 206.

[0038] Figure 2 As shown in the figure, in the present application, the output positive plate 205 and the output negative plate 206 are in a staggered structure formed by bending. The output positive plate 205 and the output negative plate 206 are insulated by an insulating partition, which is a PET insulating layer arranged between the output positive plate 205 and the output negative plate 206.

[0039] As shown in the figure, the first shell wall 101 is provided with a pouring hole 101a communicating with the pouring cavity. One of the first busbar 207 and the second busbar 208 towards the first shell wall 101 is provided with a plurality of through holes 211 for the pouring material to enter between the first busbar 207 and the second busbar 208, so as to fully wrap the capacitor core 209 and accelerate the pouring speed. Figure 1 Figure 2 As shown in the figure, the first shell wall 101 is provided with a pouring hole 101a communicating with the pouring cavity. One of the first busbar 207 and the second busbar 208 towards the first shell wall 101 is provided with a plurality of through holes 211 for the pouring material to enter between the first busbar 207 and the second busbar 208, so as to fully wrap the capacitor core 209 and accelerate the pouring speed.

[0040] As shown in the figure, the first shell wall 101 is provided with a pouring hole 101a communicating with the pouring cavity. One of the first busbar 207 and the second busbar 208 towards the first shell wall 101 is provided with a plurality of through holes 211 for the pouring material to enter between the first busbar 207 and the second busbar 208, so as to fully wrap the capacitor core 209 and accelerate the pouring speed. Figure 2 ​​As shown, in order to facilitate the electrical connection between the first busbar 207 and the second busbar 208 and the capacitor core 209, the first busbar 207 and the second busbar 208 are respectively provided with a connecting structure for electrical connection with the capacitor core 209, the connecting structure comprising a hollow hole 212 and a contact piece 213, one end of the contact piece 213 being connected to the hole wall of the hollow hole 212, and the other end extending in the center direction of the hollow hole 212 along the radial direction of the hollow hole 212, the contact piece 213 being connected with the positive electrode or the negative electrode of the capacitor core 209 by welding.

[0041] In order to improve the strength of the shell 1, as shown, Figure 1 As shown, the outer wall surface of the circumferential vertical wall 103 of the shell 1 is provided with a reinforcing structure, the reinforcing structure comprising longitudinal reinforcing ribs 104 and transverse reinforcing ribs 105, the longitudinal reinforcing ribs 104 extending in the direction from the first shell wall 101 to the second shell wall 102, a plurality of longitudinal reinforcing ribs 104 being arranged at intervals, the transverse reinforcing ribs 105 being arranged in the gap between adjacent two longitudinal reinforcing ribs 104, one or more transverse reinforcing ribs 105 being arranged in the gap between adjacent two longitudinal reinforcing ribs 104, the transverse reinforcing ribs 105 in adjacent two gaps being arranged in a staggered manner.

[0042] It should be noted that each of the embodiments in the present specification is described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0043] The principle and implementation mode of the present application are described by using specific examples in the present application, and the above description of the embodiments is only used to help understand the core idea of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the principle of the present application, the present application can be improved and modified in several ways, and these improvements and modifications also fall within the protection scope of the present application.

Claims

1. A bus capacitor, characterized in that, include: The housing (1) includes a first shell wall (101), a second shell wall (102), and a circumferential vertical wall (103). The first shell wall (101) and the second shell wall (102) are spaced apart, and the circumferential vertical wall (103) is disposed between the first shell wall (101) and the second shell wall (102). The first shell wall (101), the second shell wall (102), and the circumferential vertical wall (103) form a potting cavity. A capacitor body (2) is disposed within the potting cavity. The capacitor body (2) includes a first busbar (207), a second busbar (208), a capacitor core (209), a core positive plate (201), and a core negative plate (202). The first busbar (207) and the second busbar (208) are insulated from each other and spaced apart. The capacitor core (209) is disposed between the first busbar (207) and the second busbar (208). Between 8), the positive terminal of the capacitor core (209) is connected to the first busbar (207), the negative terminal of the capacitor core (209) is connected to the second busbar (208), the positive plate (201) of the core is connected to the first busbar (207), the negative plate (202) of the core is connected to the second busbar (208), and the positive plate (201) and the negative plate (202) of the core extend at least partially through the housing (1).

2. The bus capacitor according to claim 1, characterized in that, The core positive electrode plate (201) and the core negative electrode plate (202) satisfy the parallel condition at least partially with respect to the circumferential vertical wall (103).

3. The bus capacitor according to claim 2, characterized in that, The core positive electrode plate (201) and the core negative electrode plate (202) include parallel extensions and bent connecting portions. The parallel extensions satisfy the parallel condition relative to the circumferential vertical wall (103). The bent connecting portions are used to connect two adjacent parallel extensions to form a tortuous structure. Alternatively, the bent connecting portions are used to connect the parallel extensions near the circumferential vertical wall (103) to the first busbar (207) or the second busbar (208).

4. The bus capacitor according to any one of claims 1-3, characterized in that, The core positive electrode plate (201) and the core negative electrode plate (202) are provided with heat dissipation holes (210).

5. The bus capacitor according to any one of claims 1-3, characterized in that, The capacitor body (2) further includes an input positive plate (203), an input negative plate (204), an output positive plate (205), and an output negative plate (206). The input positive plate (203) and the output positive plate (205) are respectively connected to the first busbar (207), and the input negative plate (204) and the output negative plate (206) are respectively connected to the second busbar (208). The input positive plate (203), the input negative plate (204), the output positive plate (205), and the output negative plate (206) extend at least partially through the housing (1).

6. The bus capacitor according to claim 5, characterized in that, The input positive plate (203) and the input negative plate (204) are L-shaped. The longitudinal portion of the input positive plate (203) is connected to the first busbar (207), and the longitudinal portion of the input negative plate (204) is connected to the second busbar (208). The transverse portion of the input positive plate (203) is flush with the transverse portion of the input negative plate (204).

7. The bus capacitor according to claim 5, characterized in that, The output positive plate (205) and the output negative plate (206) are stacked in a zigzag shape, and the output positive plate (205) and the output negative plate (206) are insulated from each other by an insulating separator.

8. The bus capacitor according to any one of claims 1-3, characterized in that, The first shell wall (101) is provided with a filling hole (101a) communicating with the filling cavity, and one of the first busbar (207) and the second busbar (208) facing the first shell wall (101) is provided with a plurality of through holes (211).

9. The bus capacitor according to any one of claims 1-3, characterized in that, The first busbar (207) and the second busbar (208) are respectively provided with connection structures for electrical connection with the capacitor core (209). The connection structure includes a hollow hole (212) and a contact piece (213). One end of the contact piece (213) is connected to the hole wall of the hollow hole (212), and the other end extends radially toward the center of the hollow hole (212).

10. The bus capacitor according to any one of claims 1-3, characterized in that, The outer wall surface of the circumferential vertical wall (103) of the shell (1) is provided with a reinforcing structure. The reinforcing structure includes longitudinal reinforcing ribs (104) and transverse reinforcing ribs (105). The longitudinal reinforcing ribs (104) extend along the direction from the first shell wall (101) to the second shell wall (102). A plurality of the longitudinal reinforcing ribs (104) are spaced apart from each other. The transverse reinforcing ribs (105) are disposed between two adjacent longitudinal reinforcing ribs (104).

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