Vehicle-mounted high-voltage insulation capacitor

Abstract

The utility model discloses a vehicle-mounted high-voltage insulation capacitor, including metal heat dissipation base, the upper end fixed connection of metal heat dissipation base has the limiting baffle, four limiting baffle enclose a column shape, be provided with the opening groove between limiting baffle in this column shape, the metal heat dissipation base upper end is connected with the capacitor core through high heat conduction insulating adhesive, the capacitor core sets up in the column shape of limiting baffle enclose, the capacitor core is rectangular array distribution on the metal heat dissipation base, and the heat of capacitor core generates is passed through high heat conduction insulating adhesive and is delivered to the metal heat dissipation base, and the outside cooling liquid is passed through the water inlet pipe, the water inlet and is discharged through the water outlet and the water outlet pipe in the flow channel, and the heat exchange is generated through the cooling liquid and the capacitor core, and the heat dissipation efficiency is high, and through the metal heat dissipation base as main support structure, combines inside high heat conduction silica gel filling, forms a solid whole, can effectively resist vibration and impact.

Description

Technical Field

[0001] This utility model relates to the field of vehicle-mounted high-voltage insulating capacitor technology, specifically a vehicle-mounted high-voltage insulating capacitor. Background Technology

[0002] Vehicle-mounted high-voltage insulating capacitors are capacitors specifically designed and manufactured for the high-voltage electrical systems of new energy vehicles (such as electric vehicles and hybrid vehicles). Their core function is to handle high voltages (typically 60V to over 1000V) and provide reliable electrical insulation to ensure the safe and stable operation of the vehicle. They are usually located between the power battery and the motor inverter (DC-AC converter). With the widespread adoption of 800V high-voltage platforms and silicon carbide power devices in new energy vehicles, motor controllers place higher demands on the core component—the DC support capacitor. Existing vehicle-mounted high-voltage film capacitors typically suffer from the following drawbacks: low heat dissipation efficiency, and insufficient structural strength and shock resistance. The single encapsulation material offers limited fixation and protection for the internal capacitor core, and under long-term vibration conditions in vehicles, internal connection points may become loose. Utility Model Content

[0003] The purpose of this section is to outline some aspects of the embodiments of this utility model and to briefly introduce some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be used to limit the scope of this utility model.

[0004] In view of the problems existing in the above and / or existing vehicle-mounted high-voltage insulation capacitors, this utility model is proposed.

[0005] Therefore, the purpose of this utility model is to provide a vehicle-mounted high-voltage insulated capacitor. The heat generated by the capacitor core is transferred to the metal heat dissipation base through high thermal conductivity insulating adhesive. The external coolant enters the flow channel through the water inlet pipe and water inlet and is discharged through the water outlet and water outlet pipe. The heat exchange between the coolant and the heat generated by the capacitor core is highly efficient. The metal heat dissipation base serves as the main support structure, combined with the internal high thermal conductivity silicone gel filling, forming a solid whole that can effectively resist vibration and impact.

[0006] To solve the above-mentioned technical problems, according to one aspect of the present invention, the present invention provides the following technical solution:

[0007] A vehicle-mounted high-voltage insulating capacitor includes a metal heat sink base. A limit bracket is fixedly connected to the upper end of the metal heat sink base. Four limit brackets form a column shape, with openings between the limit brackets. A capacitor core is glued to the upper end of the metal heat sink base using a high thermal conductivity insulating adhesive. The capacitor core is positioned within the column shape formed by the limit brackets and is arranged in a rectangular array on the metal heat sink base. The upper part of the capacitor core abuts against a pressure plate, which is fixedly mounted at the lower end of a sealing plate. The sealing plate is fixedly mounted on the upper end of an annular support frame, which is fixedly mounted on the inner wall of the capacitor housing. A high thermal conductivity silicone gel fills the space between the capacitor housing and the capacitor core.

[0008] In a preferred embodiment of the vehicle-mounted high-voltage insulating capacitor described in this utility model, the metal heat sink base includes a first bolt hole, the upper end of the metal heat sink base has the first bolt hole arranged in a ring array, the upper end of the metal heat sink base has a first sealing groove, the first sealing groove is disposed inside the first bolt hole, and a first sealing ring is placed in the first sealing groove.

[0009] In a preferred embodiment of the vehicle-mounted high-voltage insulating capacitor described in this utility model, the metal heat sink base includes a flow channel, the flow channel is formed inside the metal heat sink base, and a thermally conductive diaphragm is fixedly connected to the inner wall of the flow channel.

[0010] As a preferred embodiment of the vehicle-mounted high-voltage insulating capacitor described in this utility model, the metal heat dissipation base is provided with a water inlet and a water outlet, which are respectively connected to the water outlet end and the water inlet end of the flow channel. A water inlet pipe and a water outlet pipe are fixedly connected to the outside of the metal heat dissipation base, which are respectively connected to the water outlet and the water inlet.

[0011] In a preferred embodiment of the vehicle-mounted high-voltage insulating capacitor described in this utility model, the sealing plate includes a first through hole, and the upper end of the sealing plate has a first through hole in a ring array, and a first fixing bolt is disposed through the first through hole.

[0012] In a preferred embodiment of the vehicle-mounted high-voltage insulating capacitor described in this utility model, the sealing plate includes an injection tube, the upper end of which is fixedly provided with an injection tube, a first sealing cap is threadedly connected to the upper end of the injection tube, an exhaust pipe is fixedly provided at the upper end of the sealing plate, and a second sealing cap is threadedly connected to the upper end of the exhaust pipe.

[0013] In a preferred embodiment of the vehicle-mounted high-voltage insulating capacitor described in this utility model, the sealing plate includes a negative electrode connecting copper busbar, with a negative electrode connecting copper busbar fixedly penetrating the upper end of the sealing plate and a positive electrode connecting copper busbar fixedly penetrating the upper end of the sealing plate.

[0014] As a preferred embodiment of the vehicle-mounted high-voltage insulating capacitor described in this utility model, the annular support frame includes a second bolt hole, and the annular support frame has the second bolt hole arranged in an annular array. The second bolt hole is threadedly connected to the first fixing bolt. The upper end of the annular support frame has a second sealing groove, which is located outside the second bolt hole. A second sealing ring is placed in the second sealing groove.

[0015] As a preferred embodiment of the vehicle-mounted high-voltage insulating capacitor described in this utility model, the capacitor housing includes a groove, the outer ring of the capacitor housing has a groove, and a fixing lug is fixedly connected to the lower end of the outer ring of the capacitor housing. The capacitor housing is made of aluminum alloy.

[0016] In a preferred embodiment of the vehicle-mounted high-voltage insulating capacitor described in this utility model, a second through hole is provided through the fixing ear plate, a second bolt is provided through the second through hole, and the lower end of the second bolt is threaded into the first bolt hole.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows: the heat generated by the capacitor core is transferred to the metal heat dissipation base through the high thermal conductivity insulating adhesive. The external coolant enters the flow channel through the water inlet pipe and the water outlet and is discharged through the water outlet and the water outlet pipe. The heat exchange between the coolant and the heat generated by the capacitor core is highly efficient. At the same time, the heat generated by the capacitor core is transferred to the capacitor shell through the high thermal conductivity silicone gel. The heat is then dissipated into the air through the capacitor shell. The heat dissipation area of ​​the capacitor shell is further increased by the opening of the groove. Through dual heat dissipation, the heat dissipation effect is improved. The metal heat dissipation base serves as the main support structure. Combined with the internal high thermal conductivity silicone gel filling, a solid whole is formed, which can effectively resist vibration and impact. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the metal heat sink base, limiting bracket, and capacitor core structure of this utility model;

[0021] Figure 3 This is a schematic diagram of the metal heat dissipation base, limiting bracket, and opening slot structure of this utility model;

[0022] Figure 4 This is a schematic diagram of the annular support frame, the second bolt hole, and the second sealing groove of this utility model.

[0023] Figure 5 This is a schematic diagram of the metal heat dissipation base, water inlet pipe, and water outlet pipe of this utility model.

[0024] Figure 6 This is a schematic diagram of the flow channel, heat-conducting partition, inlet and outlet of this utility model.

[0025] In the diagram: 1. Metal heat sink base; 101. First bolt hole; 102. Flow channel; 103. Thermally conductive fin; 104. Water inlet; 105. Water outlet; 106. Water inlet connector; 107. Water outlet connector; 108. First sealing groove; 2. Limiting bracket; 3. Opening groove; 4. Capacitor core; 5. Pressure plate; 6. Sealing plate; 601. First through hole; 602. First fixing bolt; 603. Glue injection tube; 604. First sealing cover; 605. Exhaust pipe; 606. Second sealing cover; 607. Negative electrode connecting copper busbar; 608. Positive electrode connecting copper busbar; 7. Annular support frame; 701. Second bolt hole; 702. Second sealing groove; 8. Capacitor shell; 801. Groove; 802. Fixing ear plate; 803. Second through hole; 804. Second bolt. Detailed Implementation

[0026] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0027] Secondly, this utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views showing the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, in actual manufacturing, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0029] This utility model provides a vehicle-mounted high-voltage insulated capacitor. The heat generated by the capacitor core is transferred to the metal heat dissipation base through high thermal conductivity insulating adhesive. External coolant enters the flow channel through the water inlet pipe and water outlet and is discharged through the water outlet and water outlet pipe. The heat exchange between the coolant and the heat generated by the capacitor core is highly efficient. The metal heat dissipation base serves as the main support structure, combined with the internal high thermal conductivity silicone gel filling, forming a solid whole that can effectively resist vibration and impact.

[0030] Figures 1-6 The diagram shown is an overall structural schematic of one embodiment of the vehicle-mounted high-voltage insulating capacitor of this utility model. Please refer to [link / reference]. Figures 1-6 This embodiment of a vehicle-mounted high-voltage insulating capacitor includes a metal heat sink base 1. A limit bracket 2 is fixedly connected to the upper end of the metal heat sink base 1. Four limit brackets 2 form a column shape, with openings 3 between the limit brackets 2 in this column shape. A capacitor core 4 is glued to the upper end of the metal heat sink base 1 using a high thermal conductivity insulating adhesive. The capacitor core 4 is positioned within the column shape formed by the limit brackets 2 and is arranged in a rectangular array on the metal heat sink base 1. The upper part of the capacitor core 4 abuts against a pressure plate 5. The pressure plate 5 is fixedly positioned at the lower end of a sealing plate 6. The sealing plate 6 is fixedly mounted on the upper end of an annular support frame 7. The annular support frame 7 is fixedly positioned on the inner wall of a capacitor housing 8. A high thermal conductivity silicone gel fills the space between the capacitor housing 8 and the capacitor core 4.

[0031] The metal heat sink base 1 serves as the main support structure, combined with the internal high thermal conductivity silicone gel filling, forming a robust whole that effectively resists vibration and impact. The limiting bracket 2 limits the movement of the capacitor core 4 in the horizontal X and Y axes, while the pressure plate 5 presses down on the capacitor core 4 to prevent Z-axis movement. An integrated power bus is installed inside the capacitor housing 8, comprising a positive bus and a negative bus, separated by an insulating layer such as a polyimide film or plastic support. Taking the positive bus as an example, the integrated power bus extends with multiple independent tabs, each tab precisely corresponding to the positive terminal of a capacitor core 4. Similarly, the negative bus also extends with a corresponding number of tabs, aligned with the negative terminal of each capacitor core 4. Each tab is laser-welded to the corresponding electrode of the capacitor core 4. Each capacitor core 4 is connected to the bus via an independent path with similar impedance. This ensures that the current is evenly distributed to each core during high-frequency, high-current operation, preventing individual cores from overheating due to excessive current. Even if a solder joint fails, it usually only affects one capacitor core 4 and does not cause the entire module to fail. The system can still operate at a reduced rate. Since each connection path is short and parallel, the parasitic inductance of the entire circuit is minimized. The ends of the integrated power bus are connected to the negative connection copper bus 607 and the positive connection copper bus 608, respectively. Furthermore, the negative connection copper bus 607 and the positive connection copper bus 608 are stacked together with the copper bus of external equipment such as inverters and directly fastened with one or more bolts. The negative connection copper bus 607 and the positive connection copper bus 608 and the metal heat sink base 1 are sealed at the connection point.

[0032] The metal heat sink base 1 includes a first bolt hole 101. The upper end of the metal heat sink base 1 has the first bolt hole 101 in a ring array. The upper end of the metal heat sink base 1 has a first sealing groove 108. The first sealing groove 108 is located inside the first bolt hole 101. A first sealing ring is placed in the first sealing groove 108.

[0033] The first sealing ring enhances the contact seal between the metal heat dissipation base 1 and the capacitor housing 8.

[0034] The metal heat dissipation base 1 includes a flow channel 102. The flow channel 102 is opened inside the metal heat dissipation base 1. A heat-conducting baffle 103 is fixedly connected to the inner wall of the flow channel 102. The metal heat dissipation base 1 has an inlet 104 and an outlet 105. The outlet 105 and the inlet 104 are respectively connected to the outlet end and the inlet end of the flow channel 102. The outer side of the metal heat dissipation base 1 is fixedly connected to an inlet pipe 106 and an outlet pipe 107. The outlet pipe 107 and the inlet pipe 106 are respectively connected to the outlet 105 and the inlet 104.

[0035] External coolant enters the flow channel 102 through the inlet pipe 106 and the inlet 104, and is discharged through the outlet 105 and the outlet pipe 107. The heat-conducting baffle 103 increases the heat exchange area with the coolant. The coolant exchanges heat with the capacitor core 4, resulting in high heat dissipation efficiency. This coolant is the coolant in the vehicle cooling system. As the vehicle cooling system circulates, the metal heat dissipation base 1 is further composed of a metal heat dissipation base plate and a sealing base plate. The main features are flow channels 102 and fixed heat-conducting baffles 103 on the metal heat dissipation base plate. The sealing base plate and the metal heat dissipation base plate are detachably connected, for example, by bolt fixing. A third sealing ring is provided between the sealing base plate and the metal heat dissipation base plate to increase the sealing performance. Alternatively, depending on the situation, after the flow channels 102 are opened on the metal heat dissipation base plate and the heat-conducting baffles 103 are processed and fixed, the metal heat dissipation base plate and the sealing base plate are welded together.

[0036] The sealing plate 6 includes a first through hole 601. The upper end of the sealing plate 6 has a ring-shaped through hole 601. A first fixing bolt 602 is installed through the first through hole 601. The sealing plate 6 includes an injection tube 603. The injection tube 603 is fixedly installed at the upper end of the sealing plate 6. A first sealing cap 604 is threadedly connected to the upper end of the injection tube 603. An exhaust pipe 605 is fixedly installed at the upper end of the sealing plate 6. A second sealing cap 606 is threadedly connected to the upper end of the exhaust pipe 605. The sealing plate 6 includes a negative electrode connecting copper busbar 607. The negative electrode connecting copper busbar 607 is fixedly installed through the upper end of the sealing plate 6. A positive electrode connecting copper busbar 608 is fixedly installed through the upper end of the sealing plate 6.

[0037] After the capacitor housing 8 and the metal heat sink base 1 are assembled and connected, the first sealing cover 604 and the second sealing cover 606 are opened, and high thermal conductivity silicone gel is injected into the interior through the glue injection tube 603. The internal gas is discharged through the exhaust pipe 605.

[0038] The annular support frame 7 includes a second bolt hole 701. The annular support frame 7 has the second bolt hole 701 arranged in an annular array. The second bolt hole 701 is threadedly connected to the first fixing bolt 602. The upper end of the annular support frame 7 has a second sealing groove 702. The second sealing groove 702 is located outside the second bolt hole 701. A second sealing ring is placed in the second sealing groove 702.

[0039] The sealing performance between the annular support frame 7 and the sealing plate 6 is enhanced by the action of the second sealing ring. The first fixing bolt 602 passes through the first through hole 601 and is threaded into the second bolt hole 701, which facilitates the disassembly or installation of the sealing plate 6 on the capacitor housing 8.

[0040] The capacitor housing 8 includes a groove 801. The groove 801 is opened on the outer ring side of the capacitor housing 8. A fixing ear plate 802 is fixedly connected to the lower end of the outer ring of the capacitor housing 8. The capacitor housing 8 is made of aluminum alloy. A second through hole 803 is opened through the fixing ear plate 802. A second bolt 804 is inserted through the second through hole 803. The lower end of the second bolt 804 is threaded into the first bolt hole 101.

[0041] The second bolt 804 is threaded through the second through hole 803 and connected to the first bolt hole 101. The capacitor housing 8 is used to install the capacitor housing 8 on the metal heat sink base 1. The heat generated by the capacitor core 4 is transferred to the capacitor housing 8 through the high thermal conductivity silicone gel. The heat is then dissipated into the air through the capacitor housing 8. The heat dissipation area of ​​the capacitor housing 8 is further increased by the groove 801.

[0042] Combination Figures 1-6 The specific usage process of a vehicle-mounted high-voltage insulating capacitor according to this embodiment is as follows: A second bolt 804 is threaded through a second through hole 803 and connected to a first bolt hole 101 for mounting the capacitor housing 8 on a metal heat sink base 1. After the capacitor housing 8 and the metal heat sink base 1 are assembled and connected, the first sealing cover 604 and the second sealing cover 606 are opened, and high thermal conductivity silicone gel is injected into the interior through the injection tube 603. Internal gas is discharged through the exhaust pipe 605. The metal heat sink base 1, as the main support structure, combined with the internal high thermal conductivity silicone gel filling, forms a robust whole that effectively resists vibration and impact. The second sealing ring enhances the sealing between the annular support frame 7 and the sealing plate 6. A first fixing bolt 602 passes through the first through hole 601. The threaded connection is located in the second bolt hole 701, which facilitates the disassembly or installation of the sealing plate 6 on the capacitor housing 8. The limiting bracket 2 limits the capacitor core 4, effectively preventing its movement in the horizontal X and Y axes. The pressure plate 5 presses down on the capacitor core 4 to prevent movement in the Z direction. The external coolant enters the flow channel 102 through the water inlet pipe 106 and the water inlet 104, and is discharged through the water outlet 105 and the water outlet pipe 107. The thermally conductive partition 103 increases the heat exchange area with the coolant. The heat exchange between the coolant and the heat generated by the capacitor core 4 results in high heat dissipation efficiency. The heat generated by the capacitor core 4 is transferred to the capacitor housing 8 through the high thermal conductivity silicone gel, and the heat is dissipated into the air through the capacitor housing 8. The heat dissipation area of ​​the capacitor housing 8 is further increased by the opening of the groove 801.

[0043] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the features in the embodiments disclosed in this invention can be combined with each other in any way. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A vehicle-mounted high-voltage insulating capacitor, comprising a metal heat sink base (1), characterized in that: The upper end of the metal heat sink base (1) is fixedly connected to a limiting bracket (2). The four limiting brackets (2) form a column shape. An opening slot (3) is provided between the limiting brackets (2) in the column shape. The upper end of the metal heat sink base (1) is glued with a capacitor core (4) by a high thermal conductivity insulating adhesive. The capacitor core (4) is set in the column shape formed by the limiting brackets (2). The capacitor core (4) is distributed in a rectangular array on the metal heat sink base (1). The upper part of the capacitor core (4) abuts against the pressure plate (5). The pressure plate (5) is fixedly set at the lower end of the sealing plate (6). The sealing plate (6) is fixedly installed at the upper end of the annular support frame (7). The annular support frame (7) is fixedly set on the inner wall of the capacitor shell (8). The space between the capacitor shell (8) and the capacitor core (4) is filled with a high thermal conductivity silicone gel.

2. The vehicle-mounted high-voltage insulating capacitor according to claim 1, characterized in that: The metal heat sink base (1) includes a first bolt hole (101). The upper end of the metal heat sink base (1) is provided with the first bolt hole (101) in a ring array. The upper end of the metal heat sink base (1) is provided with a first sealing groove (108). The first sealing groove (108) is located inside the first bolt hole (101). A first sealing ring is placed in the first sealing groove (108).

3. The vehicle-mounted high-voltage insulating capacitor according to claim 1, characterized in that: The metal heat dissipation base (1) includes a flow channel (102), and the flow channel (102) is provided inside the metal heat dissipation base (1). A thermally conductive diaphragm (103) is fixedly connected to the inner wall of the flow channel (102).

4. The vehicle-mounted high-voltage insulating capacitor according to claim 1, characterized in that: The metal heat dissipation base (1) is provided with an inlet (104) and an outlet (105). The outlet (105) and the inlet (104) are respectively connected to the outlet end and the inlet end of the flow channel (102). The metal heat dissipation base (1) is fixedly connected with an inlet pipe (106) and an outlet pipe (107). The outlet pipe (107) and the inlet pipe (106) are respectively connected to the outlet (105) and the inlet (104).

5. A vehicle-mounted high-voltage insulating capacitor according to claim 1, characterized in that: The sealing plate (6) includes a first through hole (601). The upper end of the sealing plate (6) is provided with a first through hole (601) in an annular array. A first fixing bolt (602) is provided in the first through hole (601).

6. The vehicle-mounted high-voltage insulating capacitor according to claim 1, characterized in that: The sealing plate (6) includes an injection tube (603), the upper end of the sealing plate (6) is fixedly provided with the injection tube (603), the upper end of the injection tube (603) is threadedly connected with a first sealing cap (604), the upper end of the sealing plate (6) is fixedly provided with an exhaust pipe (605), the upper end of the exhaust pipe (605) is threadedly connected with a second sealing cap (606).

7. The vehicle-mounted high-voltage insulating capacitor according to claim 1, characterized in that: The sealing plate (6) includes a negative electrode connecting copper busbar (607), and a negative electrode connecting copper busbar (607) is fixedly and through the upper end of the sealing plate (6). A positive electrode connecting copper busbar (608) is fixedly and through the upper end of the sealing plate (6).

8. A vehicle-mounted high-voltage insulating capacitor according to claim 1, characterized in that: The annular support frame (7) includes a second bolt hole (701). The annular support frame (7) has the second bolt hole (701) arranged in an annular array. The second bolt hole (701) and the first fixing bolt (602) are threaded together. The upper end of the annular support frame (7) has a second sealing groove (702). The second sealing groove (702) is located outside the second bolt hole (701). A second sealing ring is placed in the second sealing groove (702).

9. A vehicle-mounted high-voltage insulating capacitor according to claim 1, characterized in that: The capacitor housing (8) includes a groove (801), and the outer ring of the capacitor housing (8) is provided with a groove (801). A fixed ear plate (802) is fixedly connected to the lower end of the outer ring of the capacitor housing (8). The capacitor housing (8) is made of aluminum alloy.

10. A vehicle-mounted high-voltage insulating capacitor according to claim 9, characterized in that: A second through hole (803) is provided on the fixed ear plate (802), and a second bolt (804) is provided through the second through hole (803). The lower end of the second bolt (804) is threaded into the first bolt hole (101).

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