High safety capacitor end cap with insulation structure

Abstract

The utility model belongs to capacitor technical field, concretely relates to a high safety capacitor end cover with insulating structure, including a plurality of terminal, still including end cover base body, the central region of end cover base body is provided with the explosion -proof sheet, one side of explosion -proof sheet near capacitor is provided with cross recess, the depth of cross recess is 1 / 2~2 / 3 of explosion -proof sheet, explosion -proof sheet and end cover base body injection moulding are integrated, the terminal includes insulating nesting cylinder and metal terminal, the outer wall of insulating nesting cylinder and end cover base body injection moulding are integrated, and the sleeve joint in metal terminal outside, in the utility model, cross recess makes the thickness of this area thin, becomes structural weak point, when capacitor internal pressure rises suddenly, this weak area breaks down preferentially, realizes initiative and timely pressure relief, avoids capacitor overall explosion, and the design of injection moulding integration with end cover base body makes its structure overallity is strong, and the effect of leakproofness and safety is better, avoids the problem of electrolyte leakage.

Description

Technical Field

[0001] This utility model belongs to the field of capacitor technology, specifically relating to a high-safety capacitor end cap with an insulating structure. Background Technology

[0002] As a core electronic component for storing and releasing electrical energy, capacitors are widely used in power systems, electronic equipment, new energy vehicles, communication base stations and other fields. As industrial equipment develops towards high power and miniaturization, capacitors often operate in harsh environments with high voltage and high current. The internal pressure of the capacitor can rise sharply due to electrolyte decomposition, electrode aging or local overheating, which requires timely release. Therefore, explosion-proof performance has become one of the core indicators of capacitor design.

[0003] However, although some capacitors are equipped with explosion-proof plates, the explosion-proof plates and the end cap base are often assembled separately, which creates a sealing gap and can easily lead to electrolyte leakage or untimely pressure relief. Utility Model Content

[0004] In view of the above-mentioned shortcomings in the prior art, the present invention provides a high-safety capacitor end cap with an insulating structure to solve the problems in the background art.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A high-safety capacitor end cap with an insulating structure includes several terminals and an end cap base. An explosion-proof sheet is provided in the central area of ​​the end cap base. A cross groove is provided on the side of the explosion-proof sheet near the capacitor. The depth of the cross groove is 1 / 2 to 2 / 3 of the depth of the explosion-proof sheet. The explosion-proof sheet and the end cap base are injection molded as one piece. The terminal block includes an insulating nesting cylinder and a metal terminal. The outer wall of the insulating nesting cylinder is injection molded integrally with the end cap substrate and is sleeved on the outside of the metal terminal.

[0006] Furthermore, a pressure relief groove is provided around the explosion-proof sheet, and the inner wall of the pressure relief groove is coated with polytetrafluoroethylene.

[0007] Furthermore, the outer wall of the metal terminal is provided with several annular grooves, and the inner wall of the insulating nesting cylinder is provided with several annular protrusions.

[0008] Furthermore, an insulating partition is provided at one end of the terminal block near the capacitor. The insulating partition has a through hole in the center that matches the insulating nesting cylinder and is attached to the inner surface of the end cap substrate with epoxy resin.

[0009] Furthermore, a circular groove is provided at the outermost edge of the end cap substrate near the capacitor, and an insulating sealing ring is provided in the circular groove.

[0010] Furthermore, the end cap substrate has several heat dissipation fins distributed on the side away from the capacitor.

[0011] Furthermore, a silicone thermally conductive pad is adhered between the insulating partition and the end cap substrate.

[0012] Furthermore, the metal terminal is made of copper alloy and its outer wall is plated with nickel.

[0013] Compared with the prior art, this utility model has the following advantages: Compared with the prior art, in this utility model, the cross groove reduces the thickness of the area, making it a weak point in the structure. When the internal pressure of the capacitor rises sharply, the weak area will break first, realizing active and timely pressure relief and avoiding the overall explosion of the capacitor. The design of injection molding the end cap into the substrate makes its structure more robust, with better sealing and safety, avoiding the problem of electrolyte leakage.

[0014] The design of the insulating nested cylinder, insulating partition and insulating sealing ring achieves all-round multi-layer insulation, avoiding the connection between internal electrodes or other electronic components, which could lead to short circuits or even damage to the entire device. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of a high-safety capacitor end cap with an insulating structure according to the present invention (view 1). Figure 2 This is a three-dimensional structural diagram (view 2) of an embodiment of a high-safety capacitor end cap with an insulating structure according to the present invention. Figure 3 This is a schematic diagram of the structure of the wiring terminal in this utility model; The reference numerals in the accompanying drawings include: 1 end cap base, 101 heat dissipation fins, 102 pressure relief groove, 103 circular slot, 2 wiring terminal, 201 insulating nested cylinder, 202 metal wiring terminal, 2011 annular protrusion, 2021 annular groove, 3 explosion-proof sheet, 301 cross groove, and 4 insulating partition. Detailed Implementation

[0016] To enable those skilled in the art to better understand this utility model, the technical solution of this utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0017] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual images. They should not be construed as limiting the scope of this application. To better illustrate the embodiments of this utility model, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0018] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this application. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0019] In the description of this utility model, unless otherwise explicitly specified and limited, the term "connection" or similar designation indicating the connection relationship between components should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] Example 1: like Figure 1-3 As shown, this utility model provides a high-safety capacitor end cap with an insulating structure, including several terminals 2 and an end cap base 1. An explosion-proof sheet 3 is provided in the central area of ​​the end cap base 1. A cross groove 301 is provided on the side of the explosion-proof sheet 3 near the capacitor. The depth of the cross groove 301 is 1 / 2 to 2 / 3 of the depth of the explosion-proof sheet 3. The explosion-proof sheet 3 and the end cap base 1 are injection molded as one piece. In this design, the cross groove 301 reduces the thickness of this area, making it a structural weak point. When the internal pressure of the capacitor rises suddenly due to a fault, the weak cross groove 301 area will break first, releasing the internal pressure, reducing the pressure difference between the inside and outside, and preventing the capacitor from exploding and causing a safety accident. In this embodiment, the terminal block 2 includes an insulating nested cylinder 201 and a metal terminal block 202. The outer wall of the insulating nested cylinder 201 is integrally injection molded with the end cap base 1 and is sleeved on the outside of the metal terminal block 202. Both ends of the metal terminal block 202 will expose a small portion, which is connected to the electrodes inside the capacitor and the external circuit, respectively. The high conductivity of the metal enables efficient current transmission. At the same time, the insulating nested cylinder 201 is made of insulating material, which isolates the internal electrodes from contact with the end cap base 1 and avoids the formation of a current path with the metal material in the end cap base 1, which would lead to an internal short circuit.

[0021] In this embodiment, a pressure relief groove 102 is provided around the explosion-proof sheet 3. The inner wall of the pressure relief groove 102 is coated with polytetrafluoroethylene. When the pressure is too high and the explosion-proof sheet 301 ruptures, the pressure relief groove 102 can guide the high-pressure gas and substances (such as electrolyte) to be released in a directional manner, avoiding disorderly gas spraying and damage to surrounding components. At the same time, the polytetrafluoroethylene coating has the characteristics of high temperature resistance and corrosion resistance, which can further protect the end cap from corrosion damage.

[0022] In this embodiment, the outer wall of the metal terminal 202 is provided with several annular grooves 2021, and the inner wall of the insulating nesting cylinder 201 is provided with several annular protrusions 2011. The two are tightly fitted by interference fit, which has an anti-slip effect.

[0023] In this embodiment, an insulating partition 4 is provided at one end of the terminal 2 near the capacitor. The insulating partition 4 has a through hole in the center that matches the insulating nesting cylinder 201 and is attached to the inner surface of the end cap base 1 with epoxy resin adhesive, which further enhances the insulation effect of the terminal 2 area and prevents other conductive parts inside the capacitor from contacting the terminal 2 and causing short circuits or leakage.

[0024] In this embodiment, a circular groove 103 is provided at the outermost edge of the end cap base 1 near the capacitor. An insulating sealing ring is provided in the circular groove 103. The end cap base 1 and the capacitor shell are injection molded as one piece. The insulating sealing ring can increase the sealing between the end cap and the capacitor shell, preventing electrolyte leakage and avoiding leakage current.

[0025] In this embodiment, a plurality of heat dissipation fins 101 are distributed on the side of the end cap base 1 away from the capacitor.

[0026] In this embodiment, a silicone thermally conductive pad is attached between the insulating partition 4 and the end cover base 1. The silicone thermally conductive pad has good thermal conductivity and insulation properties. It fills the gap between the insulating partition 4 and the end cover base 1 and can efficiently conduct internal heat to the surface of the end cover base 1, and then dissipate it through the heat dissipation fins 101.

[0027] In this embodiment, the metal terminal 202 is made of copper alloy and its outer wall is plated with nickel.

[0028] The working principle of this utility model is as follows: In use, the insulating sealing ring in the circular slot 103 first achieves a sealed connection with the capacitor shell, ensuring that the internal electrolyte does not leak and achieving insulation isolation. One end of the metal terminal 202 is connected to the electrode inside the capacitor, and the other end is connected to the external circuit. The high conductivity of the copper alloy material enables efficient current transmission. The insulating nesting cylinder 201 can block the current path between the metal terminal 202 and the end cover base 1, preventing leakage. During the operation of the capacitor, the heat generated inside is conducted to the outer surface of the end cover base 1 through the silicone thermal pad, and then dissipated into the air through the heat dissipation fins 101, maintaining the internal temperature of the capacitor is stable. When the internal pressure of the capacitor rises suddenly due to a fault, the cross groove (weak area) on the explosion-proof plate 3 ruptures first, and the high-pressure gas and substances are released in a directional and orderly manner through the pressure relief groove 102, avoiding the overall explosion of the capacitor. At the same time, the insulating partition 4 further isolates the terminal 2 from other internal components to prevent short circuits or leakage.

[0029] The above are merely embodiments of this utility model. The circuits, electronic components, and modules involved are all prior art, fully achievable by those skilled in the art, and require no further explanation. The content protected by this application does not involve improvements to the software or methods. Commonly known structures and characteristics in the solution are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field to which this utility model pertains prior to the application date or priority date, are able to access all existing technologies in that field, and possess the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, under the guidance of this application, improve and implement this solution in conjunction with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model. These should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent.

Claims

1. A high-safety capacitor end cap with an insulating structure, comprising a plurality of terminals (2), characterized in that: It also includes an end cap base (1), the central area of ​​which is provided with an explosion-proof sheet (3), the side of the explosion-proof sheet (3) near the capacitor is provided with a cross groove (301), the depth of the cross groove (301) is 1 / 2 to 2 / 3 of the explosion-proof sheet (3), and the explosion-proof sheet (3) and the end cap base (1) are injection molded together. The terminal block (2) includes an insulating nesting cylinder (201) and a metal terminal block (202). The outer wall of the insulating nesting cylinder (201) is injection molded into the end cap base (1) and is sleeved on the outside of the metal terminal block (202).

2. The high-safety capacitor end cap with an insulating structure as described in claim 1, characterized in that: The explosion-proof sheet (3) is surrounded by a pressure relief groove (102), and the inner wall of the pressure relief groove (102) is coated with polytetrafluoroethylene.

3. The high-safety capacitor end cap with an insulating structure as described in claim 1, characterized in that: The outer wall of the metal terminal (202) is provided with several annular grooves (2021), and the inner wall of the insulating nesting cylinder (201) is provided with several annular protrusions (2011).

4. A high-safety capacitor end cap with an insulating structure as described in claim 1, characterized in that: An insulating partition (4) is provided at one end of the terminal block (2) near the capacitor. The insulating partition (4) has a through hole in the center that matches the insulating nesting cylinder (201) and is attached to the inner surface of the end cap base (1) with epoxy resin.

5. A high-safety capacitor end cap with an insulating structure as described in claim 1, characterized in that: The end cap base (1) has a circular slot (103) at its outermost edge on the side closest to the capacitor, and an insulating sealing ring is provided in the circular slot (103).

6. A high-safety capacitor end cap with an insulating structure as described in claim 1, characterized in that: The end cap substrate (1) has several heat dissipation fins (101) distributed on the side away from the capacitor.

7. A high-safety capacitor end cap with an insulating structure as described in claim 4, characterized in that: A silicone thermally conductive pad is attached between the insulating partition (4) and the end cap substrate (1).

8. A high-safety capacitor end cap with an insulating structure as described in claim 1, characterized in that: The metal terminal (202) is made of copper alloy and has a nickel-plated outer wall.

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