Laminated busbar

Abstract

The invention relates to the technical field of vehicles, in particular to a laminated busbar, which comprises a copper bar, and the copper bar comprises a first conductive layer, a second conductive layer and a third conductive layer which are arranged in sequence. The injection molding part is used for fixing the first conductive layer, the second conductive layer and the third conductive layer and keeping the adjacent conductive layers insulated; and the sealing structure is used for sealing a gap between the injection molding part and the speed reducer shell. The sealing structure is arranged between the injection molding part and the speed reducer shell and used for preventing oil liquid from leaking out from the position between the injection molding part and the speed reducer shell, and the oil-proof sealing effect is improved.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a laminated busbar. Background Art

[0002] The busbar is an important component of the electric vehicle inverter, and is mainly responsible for conducting the current in the inverter. The DC busbar connects the busbar capacitor in the integrated processing unit (IPU) to the high-voltage DC connector, and the AC busbar connects the power module to the three-phase terminal of the motor or the high-voltage AC connector of the inverter through the current sensor. The busbar plays the role of a bridge for current and signal transmission in the connection, ensuring the normal operation and high-efficiency performance of the inverter.

[0003] The motor three-phase busbar is far away from the inverter AC busbar, and an additional busbar is used to connect them. In addition, since the motor is an oil-cooled motor, the busbar must also have certain sealing and oil resistance properties. The oil resistance and sealing properties of the busbar must be emphasized in the design.

[0004] However, there is a gap between the busbar and the reducer housing on the market, which cannot completely prevent the oil at the motor end from entering the electronic control end, so its oil-proof sealing effect is limited. Summary of the invention

[0005] An embodiment of the present application provides a laminated busbar, in which a sealing structure is arranged between the injection-molded part and the reducer housing to prevent oil from leaking out from between the injection-molded part and the reducer housing.

[0006] A laminated busbar provided according to the present application includes: a copper busbar, the copper busbar includes a first conductive layer, a second conductive layer, and a third conductive layer arranged in sequence; an injection molded part, the injection molded part is used to fix the first conductive layer, the second conductive layer, and the third conductive layer, and maintain insulation between adjacent conductive layers; a sealing structure, the sealing structure is used to seal the gap between the injection molded part and the reducer housing.

[0007] In one embodiment, the sealing structure includes: an end face sealing ring, which seals the injection molded part; a radial sealing ring, which seals the injection molded part, and the plane sealed by the radial sealing ring is perpendicular to the plane sealed by the end face sealing ring.

[0008] In one embodiment, the compression rate of the end face sealing ring is between 15% and 35%, and the compression rate of the radial sealing ring is between 15% and 35%.

[0009] In one embodiment, the radial sealing ring includes: a first radial sealing ring, the first radial sealing ring seals the injection molded part, and the sealing plane of the first radial sealing ring is perpendicular to the sealing plane of the end face sealing ring; a second radial sealing ring, the second radial sealing ring seals the injection molded part, the sealing plane of the second radial sealing ring is the same plane as the sealing plane of the first radial sealing ring, and the second radial sealing ring is arranged parallel to one side of the first radial sealing ring.

[0010] In one embodiment, the injection molded parts include: a first injection molded part, the first injection molded part is used to wrap the second conductive layer; a second injection molded part, the second injection molded part is used to fix the lateral parts of the first conductive layer, the second conductive layer, and the third conductive layer; a third injection molded part, the third injection molded part is used to wrap the longitudinal parts of the first conductive layer, the second conductive layer, and the third conductive layer.

[0011] In one embodiment, the laminated busbar further includes: a first bushing, the first bushing is located on the outside of the lateral portion of the first conductive layer and is wrapped in the second injection molded part; a second bushing, the second bushing is located on the outside of the first conductive layer and is wrapped in the third injection molded part; a third bushing, the third bushing is located on the outside of the third conductive layer and is wrapped in the third injection molded part; a plurality of fasteners, the plurality of fasteners are respectively located in the first bushing, the second bushing and the third bushing, and are used to fix the second injection molded part and the third injection molded part.

[0012] In one embodiment, the copper busbar further includes: a fourth conductive layer, a first conductive layer, a second conductive layer, a third conductive layer and a fourth conductive layer arranged in sequence and relatively insulated; the injection molded parts include: a first injection molded part, the first injection molded part is used to wrap the first conductive layer; a second injection molded part, the second injection molded part is used to wrap the third conductive layer; a third injection molded part, the third injection molded part is located outside the first injection molded part and the second injection molded part, and the third injection molded part is used to wrap the transverse part and at least part of the longitudinal part of the copper busbar.

[0013] In one embodiment, the laminated busbar further includes: a first bushing, the first bushing is located on the outside of the transverse portion of the first conductive layer and is wrapped in a third injection molded part; a second bushing is located on the outside of the longitudinal portion of the first conductive layer and is wrapped in the third injection molded part; a third bushing is located on the outside of the longitudinal portion of the fourth conductive layer and is wrapped in the third injection molded part; and a plurality of fasteners, the plurality of fasteners are respectively located in the first bushing, the second bushing and the third bushing, and are used to fix the third injection molded part.

[0014] In one embodiment, the laminated busbar further comprises: a plurality of riveting studs, which correspond one by one to the first conductive layer, the second conductive layer, and the third conductive layer, and are located on the inner side of the transverse portion of the copper busbar, and the injection molded part completely wraps the riveting studs.

[0015] In one embodiment, the laminated busbar further comprises: a glue injection port, which is located at the leakage end of the copper busbar and the injection molded part and is used to inject sealing glue into the gap between the copper busbar and the injection molded part.

[0016] In one embodiment, the material of the sealing structure is AEM rubber.

[0017] In one embodiment, the material of the injection molded part is polyphenylene sulfide.

[0018] The technical solution provided in the embodiment of the present application fixes the first conductive layer, the second conductive layer, and the third conductive layer arranged in sequence in the copper busbar through an injection molded part and maintains the insulation between adjacent conductive layers, and then sets a sealing structure for the gap between the injection molded part and the reducer housing, which can effectively prevent oil from leaking out from between the injection molded part and the reducer housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the embodiments of the present application, the drawings required for use in the embodiments of the present application are briefly introduced below.

[0020] Figure 1 A schematic diagram of a three-phase laminated busbar structure provided in one embodiment of the present application;

[0021] Figure 2 A schematic diagram of a sealing structure provided in one embodiment of the present application;

[0022] Figure 3 A schematic diagram of the height of the end face sealing ring provided in one embodiment of the present application;

[0023] Figure 4 A schematic diagram of the depth of the sealing groove provided in an embodiment of the present application;

[0024] Figure 5 A schematic diagram of the dimensions of a groove of an injection molded part provided in one embodiment of the present application;

[0025] Figure 6 A schematic diagram of the dimensions of a radial sealing ring provided in an embodiment of the present application;

[0026] Figure 7 A schematic diagram of the dimensions of a groove of an injection molded part after a tolerance change provided in an embodiment of the present application;

[0027] Figure 8 A schematic diagram of the installation position of a first injection molded part provided in an embodiment of the present application;

[0028] Fig. 9 A schematic diagram of a first installation position of a second injection molded part provided in an embodiment of the present application;

[0029] Fig.10 A schematic diagram of a first installation position of a third injection molded part provided in an embodiment of the present application;

[0030] Fig.11 A schematic diagram of a first installation position of a bushing structure provided in an embodiment of the present application;

[0031] Fig.12 A schematic diagram of a laminated busbar structure provided in one embodiment of the present application;

[0032] Fig.13 A schematic diagram of a second installation position of a second injection molded part provided in one embodiment of the present application;

[0033] Fig.14 A schematic diagram of a second installation position of a bushing structure provided in an embodiment of the present application;

[0034] Fig.15 A schematic diagram of the position of a self-clinching stud provided in an embodiment of the present application;

[0035] Fig.16 A schematic diagram of the location of the glue filling port provided in an embodiment of the present application.

[0036] The above drawings include the following reference numerals:

[0037] 1-copper busbar, 2-injection molded parts, 3-sealing structure;

[0038] 4-first conductive layer, 5-second conductive layer, 6-third conductive layer;

[0039] 7-end face sealing ring, 8-radial sealing ring, 9-first radial sealing ring, 10-second radial sealing ring; 11-first injection molded part, 12-second injection molded part, 13-third injection molded part;

[0040] 14-first bushing, 15-second bushing, 16-third bushing;

[0041] 17- fourth conductive layer;

[0042] 18-pressure riveting studs;

[0043] 19-Glue filling port. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0045] Similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0046] Figure 1 A schematic diagram of a three-phase laminated busbar structure provided in an embodiment of the present application is shown in FIG. Figure 1 As shown, the laminated busbar includes: a copper bar 1, an injection molded part 2, and a sealing structure 3. The copper bar 1 includes a first conductive layer 4, a second conductive layer 5, and a third conductive layer 6 arranged in sequence; wherein the first conductive layer 4 is a U-phase copper bar, which is located at the outermost side of the copper bar 1, the second conductive layer 5 is a V-phase copper bar, and the third conductive layer 6 is a W-phase copper bar; the cross-sectional areas of the U-phase copper bar, the V-phase copper bar, and the W-phase copper bar are the same, and the copper bar 1 is designed to be 16 mm wide, 2.5 mm thick, and 40 mm in cross-sectional area. 2 , it is expected to carry 240Arms of current, which meets the carrying current. After the thermal simulation test of the copper busbar 1, the maximum temperature of the copper busbar 1 does not exceed 120°C, which meets the use requirements of the copper busbar 1. The injection molded part 2 is used to fix the first conductive layer 4, the second conductive layer 5, and the third conductive layer 6, and maintain the insulation between adjacent conductive layers; if the oil leaks from between the busbar and the reducer housing, the lubrication effect inside the reducer will be reduced, resulting in increased wear on the gear meshing surface, affecting the performance of the normally working parts, and then causing biting or peeling, which will eventually lead to equipment accidents. Therefore, the sealing structure 3 is set on the injection molded part 2 to seal the gap between the injection molded part 2 and the reducer housing.

[0047] In one embodiment, the Shore hardness of the sealing structure 3 is 50, and the material of the sealing structure 3 is ethylene acrylate rubber (AEM rubber), which has good oil resistance, can maintain stable physical and chemical properties, and is not prone to expansion or softening.

[0048] In one embodiment, the material of the injection molded part 2 is polyphenylene sulfide (PPS), which has good formability and is not easily deformed.

[0049] The present application is injection molded on a copper busbar 1 structure formed by arranging a first conductive layer 4, a second conductive layer 5, and a third conductive layer 6; an injection molded part 2 is used to fix the copper busbar 1 and maintain insulation between adjacent conductive layers; a sealing structure 3 is provided on the injection molded part 2 to seal the gap between the injection molded part 2 and the reducer housing, thereby preventing oil from leaking from between the injection molded part 2 and the reducer housing and enhancing the oil-proof sealing effect between the injection molded part 2 and the reducer housing.

[0050] Figure 2 A schematic diagram of a sealing structure provided in an embodiment of the present application is shown in FIG. Figure 2 As shown, in one embodiment, the sealing structure 3 includes: an end face sealing ring 7 and a radial sealing ring 8. The end face sealing ring 7 and the radial sealing ring 8 seal the injection molded part 2; the plane of the injection molded part 2 sealed by the radial sealing ring 8 is perpendicular to the plane sealed by the end face sealing ring 7.

[0051] In one embodiment, the compression rate of the end face sealing ring 7 is between 15% and 35%, and the compression rate of the radial sealing ring 8 is between 15% and 35%.

[0052] The specific sealing ring size and compression ratio are calculated as follows:

[0053] Figure 3 This is a schematic diagram of the height of the end face sealing ring provided in an embodiment of the present application. Figure 4 A schematic diagram of the sealing groove depth provided in an embodiment of the present application is shown in FIG. Figure 3 and Figure 4 As shown, the height of the end face sealing ring 7 is 2.8 mm ± 0.1 mm, and the depth of the housing sealing groove where the sealing ring is placed is 2 mm ± 0.05 mm.

[0054] The theoretical compression rate range of the end face seal ring 7 can be obtained by calculation:

[0055] Upper limit: [(2.8+0.1)-(2-0.05)] / (2.8+0.1)=32.7%

[0056] Lower limit: [(2.8-0.1)-(2+0.05)] / (2.8-0.1)=24.1%

[0057] Therefore, the theoretical compression rate of the end face sealing ring 7 is in the range of 15%-35%, which can play an effective sealing role.

[0058] Figure 5 This is a schematic diagram of the dimensions of the groove of the injection molded part provided in one embodiment of the present application. Figure 6 This is a schematic diagram of the radial sealing ring size provided in an embodiment of the present application. Figure 7 A schematic diagram of the dimensions of the groove of the injection molded part after the tolerance is changed according to an embodiment of the present application, as shown in FIG. Figure 5-7 As shown, the cross-sectional diameter of the radial sealing ring 8 is 3.55 (+0.05 / 0), the shell length is 43.1±0.1, the shell width is 27.1±0.1, and the groove in the injection molded part 2 for placing the sealing ring has a length of 37.3 (+0.1 / 0) and a width of 21.3 (+0.1 / 0);

[0059] After converting the single tolerance into positive and negative tolerance, the diameter of the radial sealing ring 8 is 3.525±0.025, the length of the groove for placing the sealing ring in the injection molded part 2 is 37.35±0.05, and the width is 21.35±0.05. The gap of the sealing groove is 5.75±0.15, so the single-side compression rate can be considered.

[0060] Theoretical compression rate range of radial sealing ring 8:

[0061] Upper limit: [(27.1-0.1)-(21.3+0.1)] / 2=2.8; [(3.5+0.05)-2.8] / (3.5+0.05)=23.5%

[0062] Lower limit: [(27.1+0.1)-(21.3-0)] / 2=2.95; [(3.55-0)-2.95] / (3.55-0)=16.9%

[0063] The compression rate of the radial sealing ring 8 is between 15% and 35%, which can play an effective sealing role.

[0064] In one embodiment, the radial sealing ring 8 includes: a first radial sealing ring 9 and a second radial sealing ring 10. The first radial sealing ring 9 seals the injection molded part 2, and the plane sealed by the first radial sealing ring 9 is perpendicular to the plane sealed by the end face sealing ring 7; the second radial sealing ring 10 seals the injection molded part 2, and the plane sealed by the second radial sealing ring 10 is the same plane as the plane sealed by the first radial sealing ring 9, and the second radial sealing ring 10 is arranged parallel to one side of the first radial sealing ring 9.

[0065] Figure 8 A schematic diagram of the installation position of the first injection molded part provided in an embodiment of the present application, Fig. 9 This is a schematic diagram of a first installation position of a second injection molded part provided in an embodiment of the present application. Fig.10 A schematic diagram of a first installation position of a third injection molded part provided in an embodiment of the present application, as shown in FIG. Figure 8-10 As shown, in one embodiment, the injection molded part 2 includes: a first injection molded part 11, the first injection molded part 11 is used to wrap the second conductive layer 5; a second injection molded part 12, the second injection molded part 12 is used to fix the lateral parts of the first conductive layer 4, the second conductive layer 5, and the third conductive layer 6; a third injection molded part 13, the third injection molded part 13 is used to wrap the longitudinal parts of the first conductive layer 4, the second conductive layer 5 and the third conductive layer 6.

[0066] The sealing structure 3 is disposed on the third injection molded part 13 .

[0067] Furthermore, the injection molding process is divided into three injection moldings: in the first injection molding, the second conductive layer 5 is wrapped with the first injection molding part 11; in the second injection molding, the first conductive layer 4, the second conductive layer 5, and the lateral part of the third conductive layer 6 are wrapped and fixed with the second injection molding part 12; in the third injection molding, after the copper bus 1 is fixed, the groove for placing the sealing structure 3 is processed on the third injection molding part 13, and the longitudinal parts of the first conductive layer 4, the second conductive layer 5 and the third conductive layer 6 are wrapped with the third injection molding part 13.

[0068] Fig.11 A schematic diagram of a first installation position of a bushing structure provided in an embodiment of the present application is shown in FIG. Fig.11 As shown, in one embodiment, the laminated busbar also includes: a first bushing 14, the first bushing 14 is located on the outside of the transverse portion of the first conductive layer 4 and is wrapped in the second injection molded part 12; a second bushing 15, the second bushing 15 is located on the outside of the longitudinal portion of the first conductive layer 4 and is wrapped in the third injection molded part 13; a third bushing 16, the third bushing 16 is located on the outside of the longitudinal portion of the third conductive layer 6 and is wrapped in the third injection molded part 13; a plurality of fasteners, the plurality of fasteners are respectively located in the first bushing 14, the second bushing 15 and the third bushing 16, and are used to fix the second injection molded part 12 and the third injection molded part 13 to the reducer housing respectively.

[0069] Among them, the fastener is an M5 triangular self-tapping screw. When tightened, a single bolt can provide a minimum axial force of 5.3kN, which can meet the use requirements of the sealing structure 3 for compression.

[0070] Fig.12 A schematic diagram of a laminated busbar structure provided in an embodiment of the present application is shown in FIG. Fig.13 A schematic diagram of a second installation position of a second injection molded part provided in an embodiment of the present application, as shown in FIG. Figure 8 , Fig.12 , Fig.13 As shown, in one embodiment, the copper bar 1 further includes: a fourth conductive layer 17, which is an N-phase copper bar, located at the outermost side of the copper bar 1, and the N-phase copper bar is connected to the charging copper bar. The width of the N-phase copper bar is designed to be 17.2 mm and the thickness is 2.5 mm, which meets the requirements of carrying current. The first conductive layer 4, the second conductive layer 5, the third conductive layer 6 and the fourth conductive layer 17 are arranged in sequence and relatively insulated; the injection molded part 2 includes: a first injection molded part 11, which is used to wrap the second conductive layer 5; a second injection molded part 12, which is used to wrap the third conductive layer 6; a third injection molded part 13, which is located on the outer side of the first injection molded part 11 and the second injection molded part 12, and the third injection molded part 13 is used to wrap the transverse part and at least part of the longitudinal part of the copper bar 1.

[0071] Furthermore, during the injection molding process, it is divided into three injection moldings: in the first injection molding, the position of the second conductive layer 5 is fixed by the first injection molding part 11 and the copper busbar 1 is injection molded; in the second injection molding, the position of the third conductive layer 6 is fixed by the second injection molding part 12 and injection molded; in the third injection molding, the first conductive layer 4 and the second conductive layer 5 after injection molding are fixed with the first conductive layer 4 and the fourth conductive layer 17 by the third injection molding part 13, and the third injection molding part 13 is located on the outside of the first injection molding part 11 and the second injection molding part 12, wrapping the transverse part and at least part of the longitudinal part of the copper busbar 1.

[0072] Fig.14 A schematic diagram of a second installation position of a bushing structure provided in an embodiment of the present application is shown in FIG. Fig.14As shown, in one embodiment, the laminated busbar further includes: a first bushing 14, a second bushing 15, a third bushing 16 and a plurality of fasteners. The first bushing 14 is located on the outside of the transverse portion of the first conductive layer 4 and is wrapped in the third injection molded part 13; the second bushing 15 is located on the outside of the longitudinal portion of the first conductive layer 4 and is wrapped in the third injection molded part 13; the third bushing 16 is located on the outside of the longitudinal portion of the fourth conductive layer 17 and is wrapped in the third injection molded part 13; wherein the plurality of fasteners are M5 triangular self-tapping screws, which are respectively located in the first bushing 14, the second bushing 15 and the third bushing 16, and are used to fix the third injection molded part 13 to the reducer housing. When the M5 triangular self-tapping screws are tightened, a single bolt can provide a minimum axial force of 5.3kN, which can meet the use requirements of the sealing structure 3 being compressed.

[0073] Fig.15 A schematic diagram of the position of the rivet stud provided in an embodiment of the present application is shown in FIG. Fig.15 As shown, in one embodiment, the laminated busbar further includes: a plurality of pressure riveting studs 18, the plurality of pressure riveting studs 18 correspond to the first conductive layer 4, the second conductive layer 5, and the third conductive layer 6 one by one, and are located Figure 1 As shown, the injection molded part 2 completely wraps around the rivet stud 18 on the inner side of the transverse portion of the copper bar 1 .

[0074] Furthermore, the self-clinching studs 18 are all blind hole designs, and the copper bar 1 is provided with a through hole with a diameter of 7 mm for the self-clinching studs 18 to penetrate. The self-clinching studs 18 are 11 mm long and are tightened with M5 external hexagonal flange bolts, which can meet the bolt screwing length requirements. The self-clinching studs 18 are completely wrapped during injection molding to prevent debris from being generated during the bolt tightening process and affecting the cleanliness of the reducer cavity.

[0075] Fig.16 A schematic diagram of the location of the glue filling port provided in an embodiment of the present application is shown in FIG. Fig.10 , Fig.12 , Fig.16 As shown, in one embodiment, the laminated busbar further includes: a glue injection port 19, which is located at the leakage end of the copper busbar 1 and the injection molded part 2, and is used to inject sealing glue into the gap between the copper busbar 1 and the injection molded part 2, thereby reducing the outflow of cooling oil from the gap between the injection molded part 2 and the copper busbar 1 due to the siphon effect.

[0076] The technical solution provided in the embodiment of the present application fixes the first conductive layer 4, the second conductive layer 5, and the third conductive layer 6 arranged in sequence in the copper bus 1 through the injection molded part 2 and maintains the insulation between adjacent conductive layers, and then sets a sealing structure 3 for the gap between the injection molded part 2 and the reducer housing, which can effectively prevent oil from leaking out from between the injection molded part 2 and the reducer housing.

[0077] It should be noted that, in the absence of conflict, the features in the embodiments of this application may be combined with each other.

[0078] The above description is only the preferred 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 modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A laminated busbar, characterized in that: include: A copper busbar, wherein the copper busbar comprises a first conductive layer, a second conductive layer, and a third conductive layer which are arranged in sequence; An injection molded part, which is used to fix the first conductive layer, the second conductive layer, and the third conductive layer, and maintain insulation between adjacent conductive layers; A sealing structure is used to seal the gap between the injection molded part and the reducer housing.

2. The laminated busbar according to claim 1, characterized in that: The sealing structure comprises: An end face sealing ring, the end face sealing ring seals the injection molded part; A radial sealing ring seals the injection molded part, and a sealing plane of the radial sealing ring is perpendicular to a sealing plane of the end face sealing ring.

3. The laminated busbar according to claim 2, characterized in that: The compression rate of the end face sealing ring is between 15% and 35%, and the compression rate of the radial sealing ring is between 15% and 35%.

4. The laminated busbar according to claim 2, characterized in that: The radial sealing ring comprises: A first radial sealing ring, wherein the first radial sealing ring seals the injection molded part, and a sealing plane of the first radial sealing ring is perpendicular to a sealing plane of the end face sealing ring; A second radial sealing ring, the second radial sealing ring seals the injection molded part, the plane sealed by the second radial sealing ring is the same plane as the plane sealed by the first radial sealing ring, and the second radial sealing ring is arranged parallel to one side of the first radial sealing ring.

5. The laminated busbar according to claim 1, characterized in that: The injection molded part comprises: a first injection molded part, wherein the first injection molded part is used to wrap the second conductive layer; a second injection molded part, the second injection molded part being used to fix the lateral parts of the first conductive layer, the second conductive layer, and the third conductive layer; A third injection molded part is used to wrap the longitudinal parts of the first conductive layer, the second conductive layer and the third conductive layer.

6. The laminated busbar according to claim 5, characterized in that: Also includes: a first bushing, the first bushing being located outside the lateral portion of the first conductive layer and wrapped in the second injection molded part; a second bushing, the second bushing being located outside the first conductive layer and wrapped in the third injection molded part; a third bushing, the third bushing being located outside the third conductive layer and wrapped in the third injection molded part; A plurality of fasteners are respectively located in the first bushing, the second bushing and the third bushing, and are used to fix the second injection molded part and the third injection molded part.

7. The laminated busbar according to claim 1, characterized in that: The copper busbar also includes: The fourth conductive layer, the first conductive layer, the second conductive layer, the third conductive layer and the fourth conductive layer are arranged in sequence and are relatively insulated; The injection molded part comprises: a first injection-molded part, wherein the first injection-molded part is used to wrap the first conductive layer; a second injection molded part, wherein the second injection molded part is used to wrap the third conductive layer; A third injection-molded part, the third injection-molded part is located outside the first injection-molded part and the second injection-molded part, and the third injection-molded part is used to wrap the transverse part and at least part of the longitudinal part of the copper bar.

8. The laminated busbar according to claim 7, characterized in that: Also includes: a first bushing, the first bushing being located outside the lateral portion of the first conductive layer and wrapped in the third injection molded part; a second bushing, the second bushing being located outside the longitudinal portion of the first conductive layer and wrapped in the third injection molded part; a third bushing, the third bushing being located outside the longitudinal portion of the fourth conductive layer and wrapped in the third injection molded part; A plurality of fasteners are respectively located in the first bushing, the second bushing and the third bushing, and are used to fix the third injection molded part.

9. The laminated busbar according to claim 1, characterized in that: Also includes: A plurality of self-clinching studs, which correspond to the first conductive layer, the second conductive layer and the third conductive layer one by one, are located on the inner side of the transverse portion of the copper bar, and the injection molded part completely wraps the self-clinching studs.

10. The laminated busbar according to claim 1, characterized in that: Also includes: A glue injection port is located at the leakage end of the copper busbar and the injection molded part, and is used to inject sealing glue into the gap between the copper busbar and the injection molded part.

11. The laminated busbar according to claim 1, characterized in that: The material of the sealing structure is AEM rubber.

12. The laminated busbar according to claim 1, characterized in that: The material of the injection molded part is polyphenylene sulfide.

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