Capacitor and electronic device

Abstract

The utility model discloses a capacitor and electronic equipment, and belongs to the field of power electronics. The capacitor comprises a shell, a core unit, a heat conduction expansion layer and an explosion-proof device. The shell is provided with an electrode; the core unit is arranged in the shell; the heat conduction expansion layer is arranged in the shell and coats the outer side of the core unit; the explosion-proof device comprises a connecting assembly and an executing piece. The connecting assembly is connected with the inner wall of the shell, and the connecting assembly is provided with a first contact electrically connected with the electrode and a second contact electrically connected with the core unit; the executing part is movably arranged between the heat conduction expansion layer and the connecting assembly, the executing part is used for moving when the heat conduction expansion layer expands so that the connecting assembly can be broken into multiple sections, and the first contact and the second contact are located at different sections. According to the invention, the safety and reliability of the capacitor can be improved through a physical explosion-proof mode.

Description

Technical Field

[0001] The present application belongs to the field of power electronics, and in particular to a capacitor and an electronic device. Background Art

[0002] With the development of science and technology, capacitors play a supporting and filtering role in the DC high-low voltage conversion process and grid-connected AC filtering process of power supply equipment such as photovoltaic inverters or energy storage converters, becoming indispensable key components.

[0003] Due to unreasonable structure or materials, capacitors in related technologies are prone to high internal temperatures due to abnormal ambient temperatures or internal product conditions, which can easily lead to explosions and fire accidents, and have poor safety. Utility Model Content

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a capacitor and an electronic device, which can improve the safety of the capacitor by means of physical explosion-proofing.

[0005] In a first aspect, the present application provides a capacitor, comprising: a shell, a core unit, a thermal expansion layer and an explosion-proof device.

[0006] The shell is provided with an electrode; the core unit is provided in the shell; the thermal expansion layer is provided in the shell and is coated on the outside of the core unit; the explosion-proof device includes a connecting component and an actuator; the connecting component is connected to the inner wall of the shell, and the connecting component has a first contact electrically connected to the electrode and a second contact electrically connected to the core unit; the actuator is movably provided between the thermal expansion layer and the connecting component, and the actuator is used to move when the thermal expansion layer expands to break the connecting component into multiple sections, and the first contact and the second contact are in different sections.

[0007] According to the capacitor provided in the embodiment of the present application, an explosion-proof device is provided, the explosion-proof device includes a connecting component and an actuator, the connecting component is used to connect the core unit and the electrode, the actuator is movably arranged between the thermally conductive expansion layer and the connecting component, when the thermally conductive expansion layer expands due to heat, the thermally conductive expansion layer drives the actuator to move in the direction of the connecting component, the actuator can break the connecting component into multiple sections, the first contact and the second contact are in different sections, that is, the first contact and the second contact are physically disconnected, so that the core unit and the electrode are disconnected to form an open circuit of the capacitor, thereby reducing the risk of continuous damage and explosion caused by continued power-on of the capacitor, and improving the safety of the capacitor.

[0008] According to an embodiment of the present application, the thermally conductive expansion layer is configured to expand when the temperature reaches a target temperature to drive the actuator to move.

[0009] According to an embodiment of the present application, the actuator is connected to the thermal expansion layer, and the actuator is suitable for being movably installed in the housing between a first position and a second position;

[0010] When the actuator is in the first position, the actuator and the connecting component are spaced apart, and the electrode and the core unit are electrically connected; when the actuator is in the second position, the connecting component is broken into multiple sections to disconnect the electrode and the core unit.

[0011] According to an embodiment of the present application, the actuator includes: a body and a top opening structure, the body is connected to the thermal expansion layer, and the top opening structure is connected to the body and protrudes from the body toward the connection component.

[0012] According to one embodiment of the present application, the connection component includes:

[0013] A first connecting member and a second connecting member, wherein the second connecting member is connected to the shell, the first connecting member is connected to the second connecting member, the first connecting member has the first contact and the second contact which are spaced apart from each other, and the actuator is used to move when the thermal expansion layer expands to break the first connecting member into multiple sections.

[0014] According to an embodiment of the present application, along the distribution direction of the first contacts and the second contacts, the width of the area between the first contacts and the second contacts on the first connector is smaller than the width of other areas on the first connector.

[0015] According to one embodiment of the present application, the second connecting member includes a first connecting portion and a second connecting portion, one end of the first connecting portion is connected to the inner wall of the shell, and the other end is connected to the second connecting portion.

[0016] According to one embodiment of the present application, the second connecting member includes two spaced-apart connecting members;

[0017] The two second connecting members are arranged opposite to each other along the central axis of the shell, the outer ends of the two first connecting parts are connected to the inner wall of the shell, the inner ends of the two second connecting parts are respectively connected to the two ends of the first connecting member, and the first connecting member is spaced apart from the first connecting part.

[0018] According to one embodiment of the present application, it satisfies: H>h;

[0019] Wherein, H is the distance between the top surface of the body and the bottom surface of the second connecting portion, and h is the distance between the top surface of the top opening structure and the bottom surface of the first connecting member.

[0020] According to one embodiment of the present application, the second connecting portion is a supporting epoxy board.

[0021] According to an embodiment of the present application, the thermally conductive expansion layer is a thermally conductive silicone layer.

[0022] In a second aspect, the present application provides an electronic device, comprising: any one of the capacitors described above.

[0023] According to the electronic device provided in the embodiment of the present application, an explosion-proof device is provided, which includes a connecting component and an actuator. The connecting component is used to connect the core unit and the electrode. The actuator is movably arranged between the thermally conductive expansion layer and the connecting component. When the thermally conductive expansion layer expands due to heat, the thermally conductive expansion layer drives the actuator to move toward the direction of the connecting component. The actuator can break the connecting component into multiple sections. The first contact and the second contact are in different sections, that is, the first contact and the second contact are physically disconnected, so that the core unit and the electrode are disconnected to form an open circuit of the capacitor, thereby reducing the risk of continuous damage and explosion caused by continued power-on of the capacitor, thereby improving the safety of the capacitor.

[0024] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0026] Figure 1 is a schematic diagram of the structure of a capacitor provided in an embodiment of the present application;

[0027] Figure 2 is a front view of an execution element provided in an embodiment of the present application;

[0028] Figure 3 is a top view of an actuator provided in an embodiment of the present application;

[0029] Figure 4 yes Figure 1 Cross-section at AA in the middle;

[0030] Figure 5 It is one of the partial schematic diagrams of the connection assembly provided in the embodiment of the present application;

[0031] Figure 6 This is the second partial schematic diagram of the connection assembly provided in the embodiment of the present application;

[0032] Figure 7 This is the third partial schematic diagram of the connection assembly provided in the embodiment of the present application;

[0033] Figure 8 This is the fourth partial schematic diagram of the connection assembly provided in the embodiment of the present application;

[0034] Reference numerals:

[0035] Shell 1, electrode 11, metal shell 12, plastic cover 13, core unit 2, thermal expansion layer 3;

[0036] Explosion-proof device 4, connecting assembly 41, first connecting member 411, first contact 4111, second contact 4112, second connecting member 412, first connecting portion 4121, second connecting portion 4122, actuator 42, body 421, top opening structure 422. DETAILED DESCRIPTION

[0037] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0038] Reference below Figure 1-Figure 8 A capacitor and an electronic device according to embodiments of the present application are described.

[0039] like Figure 1 As shown, the capacitor of the embodiment of the present application includes: a housing 1, a core unit 2, a thermal expansion layer 3 and an explosion-proof device 4.

[0040] The shell 1 is provided with an electrode 11; the core unit 2 is provided in the shell 1; the thermal expansion layer 3 is provided in the shell 1 and is coated on the outside of the core unit 2; the explosion-proof device 4 includes a connecting component 41 and an actuator 42; the connecting component 41 is connected to the inner wall of the shell 1, and the connecting component 41 has a first contact 4111 electrically connected to the electrode 11 and a second contact 4112 electrically connected to the core unit 2; the actuator 42 is movably arranged between the thermal expansion layer 3 and the connecting component 41, and the actuator 42 is used to move when the thermal expansion layer 3 expands to break the connecting component 41 into multiple sections, and the first contact 4111 and the second contact 4112 are in different sections.

[0041] The shell 1 has a cavity, and the core unit 2, the heat-conducting expansion layer 3 and the explosion-proof device 4 are all arranged in the shell 1. The shell 1 can be cylindrical, square or other containers that can meet the use conditions.

[0042] The shell 1 may include a metal shell 12 and a plastic cover 13. The metal shell 12 serves to install and load the core unit 2. The plastic cover is provided with an electrode 11. The electrode 11 may be a copper electrode stud. The electrode 11 is assembled at intervals or embedded in the plastic cover 13. The electrode 11 includes two electrodes. The two electrodes 11 are respectively connected to the two poles of the core unit 2. The core unit 2 is connected to the circuit through the two electrodes 11.

[0043] One of the electrodes 11 is welded together with the first contact 4111 of the connecting component 41 through a connecting copper wire, and the second contact 4112 of the connecting component 41 is welded to one side of the core unit 2 through another connecting copper wire; the other side of the core unit 2 is directly welded to the other electrode 11 through the connecting copper wire, finally forming an electrical connection of the capacitor.

[0044] Among them, the thermal expansion layer 3 can expand after being heated, and the thermal expansion layer 3 is coated on the outside of the core unit 2. When the core unit 2 is abnormal or the ambient temperature is abnormal, high temperature is formed inside the capacitor, and the thermal expansion layer 3 expands after being heated. Since the explosion-proof device 4 is arranged between the core unit 2 and the thermal expansion layer 3, the thermal expansion layer 3 can drive the actuator 42 to move after being heated and expanded, so that the connecting component 41 is broken into multiple sections to disconnect the electrical connection between the electrode 11 and the core unit 2, thereby reducing the risk of the core unit 2 being damaged when the capacitor continues to be energized.

[0045] The thermal expansion layer 3 may be epoxy resin filler, thermal silica gel or other thermal insulation medium. The thermal expansion layer 3 plays the role of insulation protection and anti-oxidation and air isolation.

[0046] Among them, the connecting component 41 is connected to the inner wall of the metal shell 12, and the connecting component 41 and the metal shell 12 maintain a fixed position. The connecting component 41 has a first contact 4111 and a second contact 4112. The first contact 4111 is used to connect the connecting component 41 to one of the two electrodes 11, and the second contact 4112 is used to connect the connecting component 41 to one side of the core unit 2.

[0047] The actuator 42 is movably arranged between the thermal expansion layer 3 and the connecting component 41. When the thermal expansion layer 3 expands, the thermal expansion layer 3 drives the actuator 42 to move toward the connecting component 41. The actuator 42 can break the connecting component 41 into multiple sections. The first contact 4111 and the second contact 4112 are in different sections, that is, the first contact 4111 and the second contact 4112 are physically disconnected, thereby disconnecting the core unit 2 and the electrode 11 to form an open circuit of the capacitor, reducing the risk of continuous damage and explosion of the capacitor due to continued power-on, and improving the safety of the capacitor.

[0048] The actuator 42 can at least break the connecting component 41 into two sections, and the first contact 4111 and the second contact 4112 are respectively located on different sections of the connecting component 41 .

[0049] The outer diameter of the actuator 42 is smaller than the inner diameter of the housing 1 , that is, the outer diameter of the actuator 42 is smaller than the inner diameter of the metal housing 12 , so that the actuator 42 can move easily.

[0050] According to the capacitor provided in the embodiment of the present application, an explosion-proof device 4 is provided, the explosion-proof device 4 includes a connecting component 41 and an actuator 42, the connecting component 41 is used to connect the core unit 2 and the electrode 11, the actuator 42 is movably arranged between the thermal expansion layer 3 and the connecting component 41, after the thermal expansion layer 3 is heated and expanded, the thermal expansion layer 3 drives the actuator 42 to move toward the direction of the connecting component 41, the actuator 42 can break the connecting component 41 into multiple sections, the first contact 4111 and the second contact 4112 are in different sections, that is, the first contact 4111 and the second contact 4112 are physically disconnected, so that the core unit 2 and the electrode 11 are disconnected to form an open circuit of the capacitor, thereby reducing the risk of continuous damage and explosion caused by continued power-on of the capacitor, and improving the safety of the capacitor.

[0051] It should be noted that the explosion-proof device 4 of the present application belongs to physical explosion-proof. According to the experimental results of the applicant, physical explosion-proof has higher explosion-proof reliability than other forms of explosion-proof and is more suitable for use in occasions with higher safety performance requirements, such as capacitors that are prone to fire and explosion.

[0052] In some embodiments, the thermally conductive expansion layer 3 is configured to expand when the temperature reaches a target temperature to drive the actuator 42 to move.

[0053] The thermal expansion layer 3 may be epoxy resin filler, thermally conductive silica gel or other solid thermally conductive insulating medium.

[0054] In some embodiments, the thermal expansion layer 3 is a thermally conductive silicone layer.

[0055] In this embodiment, the thermally conductive silicone layer can be made of high thermal conductivity silicone material, and the insulating material filled in the capacitor is high thermal conductivity silicone with an appropriate thermal expansion coefficient. The thermal conductivity of the high thermal conductivity silicone is about 3.0W / (m﹒K). Compared with the low thermal conductivity epoxy resin in the related technology, the thermal conductivity of the epoxy resin is about 0.8W / (m﹒K), which enhances the thermal conductivity of the entire product, thereby improving the electrical performance indicators such as the maximum ripple current resistance of the capacitor.

[0056] It should be noted that the target temperature is related to the thermal expansion coefficient of the thermal expansion layer 3 . Thermal expansion layers 3 made of different materials have different expansion coefficients and expansion temperatures, and different thermal expansion layers 3 have different target temperatures.

[0057] In some embodiments, the target temperature may be 110° C.-120° C., and the push-open structure 422 may push open the first connector 411 by the thermal expansion force generated by the thermal expansion layer 3 at 110° C.-120° C.

[0058] The thermally conductive expansion layer 3 can expand before the capacitor bulges, that is, before the core unit 2 is damaged, to drive the actuator 42 to move, thereby cutting off the electrical connection between the core unit 2 and the electrode 11 before the core unit 2 bulges, reducing the risk of the core unit 2 being damaged when the capacitor continues to be energized, and increasing the service life of the capacitor.

[0059] In some embodiments, the actuator 42 can be spaced apart from the thermal expansion layer 3, or can be connected to the thermal expansion layer 3. When the actuator 42 is spaced apart from the thermal expansion layer 3, the thermal expansion layer 3 expands to a certain volume and contacts the actuator 42. When the thermal expansion layer 3 contacts the actuator 42, the thermal expansion layer 3 drives the actuator 42 to move. When the actuator 42 contacts the thermal expansion layer 3, the thermal expansion layer 3 expands and drives the actuator 42 to move. Both of the above-mentioned settings can achieve the effect of the thermal expansion layer 3 expanding and driving the actuator 42 to move.

[0060] In some embodiments, the actuator 42 is connected to the thermal expansion layer 3, and the actuator 42 is suitable for being moved and installed in the shell 1 between a first position and a second position; when the actuator 42 is in the first position, the actuator 42 and the connecting component 41 are spaced apart, and the electrode 11 and the core unit 2 are electrically connected; when the actuator 42 is in the second position, that is, the thermal expansion layer 3 expands before the core unit 2 bulges, so that the connecting component 41 is broken into multiple sections to disconnect the electrode 11 and the core unit 2, thereby reducing the risk of the core unit 2 being damaged when the capacitor continues to be energized, thereby increasing the service life of the capacitor.

[0061] The actuator 42 can move between the first position and the second position, and the movement mode can be translational sliding or rotational sliding.

[0062] In some embodiments, the actuator 42 is disposed on the surface of the thermal expansion layer 3 and connected to the surface of the thermal expansion layer 3, and the thermal expansion layer 3 is driven to move when the thermal expansion layer 3 is heated and expands. Alternatively, the actuator 42 can be placed on the surface of the thermal expansion layer 3 to move with the expansion of the thermal expansion layer 3.

[0063] When the actuator 42 is in the first position, there are the following two situations:

[0064] First, when the temperature of the capacitor is normal, the thermal expansion layer 3 does not expand, and the actuator 42 is located at a position spaced apart from the connecting component 41 .

[0065] Secondly, when the core unit 2 generates heat but the heating temperature is normal, although the thermal expansion layer 3 expands, the expansion volume is small, and the actuator 42 is still located at a position spaced apart from the connecting component 41 .

[0066] When the actuator 42 is in the second position, the thermal expansion layer 3 expands due to heat, causing the actuator 42 to move to a position with a negative distance from the connecting component 41. The actuator 42 breaks the connecting component 41 into multiple sections, and the section where the first contact 4111 is located is disconnected from the section where the second contact 4112 is located.

[0067] In some embodiments, the top surface of the thermal expansion layer 3 contacts the bottom surface of the actuator 42, and the other surfaces of the thermal expansion layer 3 contact the inner wall of the metal shell 12 of the shell 1, so that the thermal expansion layer 3 expands in the direction toward the connecting component 41, thereby driving the actuator 42 to move in the direction toward the connecting component 41.

[0068] In some embodiments, Figure 2 and Figure 3 As shown, the actuator 42 includes: a body 421 and a top-opening structure 422 , the body 421 is connected to the thermal expansion layer 3 , and the top-opening structure 422 is connected to the body 421 and protrudes from the body 421 toward the connection component 41 .

[0069] The push-up structure 422 is located between the first contact 4111 and the second contact 4112 , so as to push up the portion of the connection component 41 located between the first contact 4111 and the second contact 4112 .

[0070] In this embodiment, by providing a top-opening structure 422 protruding from the main body 421, the stroke of the actuator 42 to break the connecting component 41 can be shortened, and the thermal expansion layer 3 can drive the actuator 42 to move to the second position under a smaller expansion volume; at the same time, providing the top-opening structure 422 can reduce the force area and reduce the difficulty of breaking the connecting component 41.

[0071] In some embodiments, the outer diameter of the top-opening structure 422 is smaller than the distance between the first contact 4111 and the second contact 4112 , which further improves the reliability of the top-off connection component 41 and reduces the difficulty of the top-off connection component 41 .

[0072] In some embodiments, the top opening structure 422 may be a hard insulating member made of FR4 or other materials. The top opening structure 422 must be able to extinguish itself after burning to enhance its safety.

[0073] The main body 421 is provided with a wire-passing hole for passing the connecting copper wire.

[0074] In some embodiments, the connecting component 41 includes: a first connecting member 411 and a second connecting member 412, the second connecting member 412 is connected to the shell, the first connecting member 411 is connected to the second connecting member 412, the first connecting member 411 has a first contact 4111 and a second contact 4112 that are spaced apart, and the actuator 42 is used to move when the thermal expansion layer 3 expands to break the first connecting member 411 into multiple sections.

[0075] Among them, the second connecting member 412 can be an annular structure with a through hole, or it can be two parts set apart. The area between the first contact 4111 and the second contact 4112 of the first connecting member 411 is exposed to the through hole of the annular structure or the gap between the two parts set apart, so that the top-opening structure 422 can pass through the through hole of the annular structure or the gap between the two parts set apart to break the first connecting member 411.

[0076] In some embodiments, along the axial projection of the capacitor, the top opening structure 422 is located in the middle of the second connector 412 , and the middle portion of the first connector 411 is exposed to the top opening structure 422 , so that the top opening structure 422 can break the connection assembly 41 .

[0077] In some embodiments, Figure 4 and Figure 6 As shown, along the distribution direction of the first contacts 4111 and the second contacts 4112 , the width of the area between the first contacts 4111 and the second contacts 4112 on the first connector 411 is smaller than the width of other areas on the first connector 411 .

[0078] Among them, the area between the first contact 4111 and the second contact 4112 on the first connecting member 411 can be a waist shape or have a notch to reduce the structural strength of the area between the first contact 4111 and the second contact 4112, thereby reducing the difficulty of breaking the connecting component 41, and making the connecting component 41 break into multiple sections before the core unit 2 bulges, so as to disconnect the electrode 11 and the core unit 2, thereby reducing the risk of the core unit 2 being damaged when the capacitor continues to be energized, reducing the risk of continuous damage and explosion caused by continued energization of the capacitor, and improving the safety of the capacitor.

[0079] Among them, the first connecting member 411 can be a conductive thin sheet such as a copper sheet, so that when the top-opening structure 422 is displaced, the thermal expansion force generated by the thermal expansion layer 3 at the target temperature can push the first connecting member 411 open. At the same time, the first connecting member 411 meets the overall overcurrent capacity of the capacitor when it works for a long time.

[0080] It should be noted that, since the expansion coefficients and expansion temperatures of the thermal expansion layers 3 made of different materials are different, the distance h between the top surface of the top opening structure 422 and the bottom surface of the connecting component 41 can be determined according to the specific material of the thermal expansion layer 3 .

[0081] In some embodiments, Figure 4 As shown, the second connecting member 412 includes a first connecting portion 4121 and a second connecting portion 4122, one end of the first connecting portion 4121 is connected to the inner wall of the metal shell 12 of the shell 1, and the other end is connected to the second connecting portion 4122; the second connecting portion 4122 is connected to the first connecting member 411, and the first connecting member 411 is spaced apart from the first connecting portion 4121.

[0082] Among them, Figure 5 , Figure 7 and Figure 8 As shown, the first connecting part 4121 may include two connecting surfaces, and the two connecting surfaces form an L-shape. One connecting surface of the first connecting part 4121 is an arc surface that is adapted to the inner wall of the metal shell 12 of the shell 1, so as to facilitate connection with the inner wall of the metal shell 12, and the connection method may be a fixed connection method such as seamless welding; the other connecting surface of the first connecting part 4121 is a plane that is adapted to the second connecting part 4122, so as to facilitate connection with the second connecting part 4122, and the connection method may be a fixed connection through nuts, rivets or other fasteners, so as to facilitate welding at the first contact 4111 and the second contact 4112.

[0083] The second connection portion 4122 may be a hard insulating material board such as a supporting epoxy board.

[0084] In some embodiments, Figure 1 and Figure 4 As shown, the second connecting member 412 includes two spaced-apart connecting members 412; the two second connecting members 412 are arranged opposite to each other along the central axis of the shell 1, the outer ends of the two first connecting parts 4121 are connected to the inner wall of the metal shell 12 of the shell 1, and the inner ends of the two second connecting parts 4122 are respectively connected to the two ends of the first connecting member 411, and the first connecting member 411 is spaced-apart from the first connecting part 4121.

[0085] In this embodiment, the two ends of the first connecting member 411 are respectively connected to two second connecting parts 4122 spaced apart from each other. Along the axial projection, the top opening structure 422 is located between the two second connecting members 412 spaced apart from each other, and the middle part of the first connecting member 411 is exposed to the top opening structure 422, so that the top opening structure 422 can break the connecting assembly 41 before the core unit 2 bulges, thereby reducing the risk of the core unit 2 being damaged due to the capacitor continuing to be energized.

[0086] Among them, Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, both ends of the first connecting member 411 can be detachably connected to the second connecting member 412 by nuts, rivets or other fasteners to facilitate disassembly and replacement.

[0087] In some embodiments, Figure 1 As shown, the capacitor satisfies: satisfies: H>h; wherein H is the distance between the top surface of the body 421 and the bottom surface of the second connecting portion 4122, and h is the distance between the top surface of the top opening structure 422 and the bottom surface of the first connecting member 411.

[0088] Among them, H satisfies 8mm≤H≤15mm, for example, H can be 10mm or 11mm; h satisfies 3mm≤H≤7mm, for example, h can be 5mm or 6mm.

[0089] It should be noted that, according to the requirements of different capacitor usage scenarios, an adaptive thermal expansion layer 3 with electrical insulation and sealing properties can be selected. The thermal expansion layer 3 made of different materials has different expansion coefficients. The value of h can be adjusted according to the volume change after heating, but it is necessary to ensure that H is much larger than the h value.

[0090] The actuator 42 is placed in parallel with the connection assembly 41 to improve the reliability of the actuator 42 breaking the connection assembly 41 and reduce the risk of the core unit 2 being damaged due to continued power supply to the capacitor.

[0091] In this embodiment, by setting the distance h between the top surface of the top opening structure 422 and the bottom surface of the connecting component 41 to be smaller than the distance H between the top surface of the main body 421 and the bottom surface of the connecting component 41, the stroke of the actuator 42 to break the connecting component 41 can be shortened, thereby improving the reliability of breaking the connecting component 41 and reducing the risk of the core unit 2 being damaged due to the capacitor continuing to be energized.

[0092] The capacitor provided in the present application has high versatility and can realize DC filtering and AC filtering. Compared with the AC filter capacitor using castor oil and other media in the related art, it can effectively reduce the risk of liquid leakage after the failure of the existing AC filter capacitor.

[0093] In actual use, the explosion-proof principle of the capacitor of the present application is: when the capacitor is abnormal or the ambient temperature is abnormal, when high temperature is formed inside the capacitor, the thermal expansion of the thermal conductive silicone causes the top opening structure 422 to form pressure on the waist or notch of the first connecting piece 411, so that the first connecting piece 411 is disconnected to form an open circuit of the capacitor, thereby reducing the risk of continuous damage and explosion caused by continued power-on of the capacitor and improving the safety of the capacitor.

[0094] An embodiment of the present application also provides an electronic device, comprising any one of the capacitors described above.

[0095] Among them, the electronic equipment can be power conversion equipment such as photovoltaic inverters and energy storage converters.

[0096] According to the electronic device provided in the embodiment of the present application, an explosion-proof device 4 is provided, and the explosion-proof device 4 includes a connecting component 41 and an actuator 42. The connecting component 41 is used to connect the core unit 2 and the electrode 11. The actuator 42 is movably arranged between the thermal expansion layer 3 and the connecting component 41. After the thermal expansion layer 3 is heated and expanded, the thermal expansion layer 3 drives the actuator 42 to move toward the direction of the connecting component 41. The actuator 42 causes the connecting component 41 to break into multiple sections before the core unit 2 bulges. The first contact 4111 and the second contact 4112 are in different sections, that is, the first contact 4111 and the second contact 4112 are physically disconnected, so that the core unit 2 and the electrode 11 are disconnected to form an open circuit of the capacitor, thereby reducing the risk of continuous damage and explosion caused by continued power-on of the capacitor, thereby improving the safety of the capacitor.

[0097] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0098] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0099] In the description of this application, "first feature" or "second feature" may include one or more of the features.

[0100] In the description of the present application, “plurality” means two or more.

[0101] In the description of the present application, a first feature being “on” or “under” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact with each other but are in contact with each other via another feature therebetween.

[0102] In the description of the present application, “above”, “over” and “above” a first feature to a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0103] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0104] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A capacitor, characterized in that: include: A shell, wherein the shell is provided with electrodes; A core unit, wherein the core unit is disposed in the shell; A heat-conducting expansion layer, the heat-conducting expansion layer is disposed in the shell and covers the outer side of the core unit; An explosion-proof device, comprising a connecting component and an actuator; the connecting component is connected to the inner wall of the shell, the connecting component has a first contact electrically connected to the electrode and a second contact electrically connected to the core unit; the actuator is movably arranged between the thermal expansion layer and the connecting component, the actuator is used to move when the thermal expansion layer expands to break the connecting component into multiple sections, and the first contact and the second contact are in different sections.

2. The capacitor according to claim 1, characterized in that The thermally conductive expansion layer is configured to expand when the temperature reaches a target temperature to drive the actuator to move.

3. The capacitor according to claim 1, characterized in that The actuator is connected to the thermal expansion layer, and the actuator is suitable for being installed in the housing in a movable manner between a first position and a second position; When the actuator is in the first position, the actuator and the connecting assembly are spaced apart, and the electrode and the core unit are electrically connected; When the actuator is in the second position, the connecting assembly is broken into multiple sections to disconnect the electrode and the core unit.

4. The capacitor according to claim 3, characterized in that The actuator comprises: a body and a top-opening structure, wherein the body is connected to the thermal expansion layer, and the top-opening structure is connected to the body and protrudes from the body in a direction toward the connecting component.

5. The capacitor according to claim 4, characterized in that The connection component comprises: A first connecting member and a second connecting member, wherein the second connecting member is connected to the shell, the first connecting member is connected to the second connecting member, the first connecting member has the first contact and the second contact which are spaced apart from each other, and the actuator is used to move when the thermal expansion layer expands to break the first connecting member into multiple sections.

6. The capacitor according to claim 5, characterized in that Along the distribution direction of the first contacts and the second contacts, the width of the area between the first contacts and the second contacts on the first connector is smaller than the width of other areas on the first connector.

7. The capacitor according to claim 5, characterized in that The second connecting member includes a first connecting portion and a second connecting portion, wherein one end of the first connecting portion is connected to the inner wall of the shell, and the other end of the first connecting portion is connected to the second connecting portion.

8. The capacitor according to claim 7, characterized in that The second connecting member includes two spaced apart arrangements; The two second connecting members are arranged opposite to each other along the central axis of the shell, the outer ends of the two first connecting parts are connected to the inner wall of the shell, the inner ends of the two second connecting parts are respectively connected to the two ends of the first connecting member, and the first connecting member is spaced apart from the first connecting part.

9. The capacitor according to claim 7, characterized in that Satisfies: H>h; Wherein, H is the distance between the top surface of the body and the bottom surface of the second connecting portion, and h is the distance between the top surface of the top opening structure and the bottom surface of the first connecting member.

10. The capacitor according to claim 7, characterized in that The second connecting portion is a supporting epoxy board.

11. The capacitor according to any one of claims 1 to 10, characterized in that: The thermal expansion layer is a thermally conductive silicone layer.

12. An electronic device, characterized in that: Comprising a capacitor as claimed in any one of claims 1 to 11.

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