Capacitor and photovoltaic inverter

Abstract

The application discloses a capacitor and a photovoltaic inverter, and belongs to the technical field of photovoltaic power generation. The capacitor comprises a shell, a core body installed in the shell, a cover plate installed at an open end of the shell and connected with the shell, a first supporting piece installed in the shell and located between the core body and the cover plate, and a limiting structure matched with the shell being arranged between the first supporting piece and the shell, and an electrode penetrating through the cover plate and the first supporting piece and electrically connected with the core body. According to the capacitor, the limiting structure matched with the shell is arranged between the first supporting piece and the shell, the upward displacement of the first supporting piece is effectively limited, the acting force of the first supporting piece on the edge of the cover plate is reduced, the connection between the cover plate and the shell is delayed, the risk of the connection between the cover plate and the shell being cracked in advance is reduced, the displacement of the cover plate can be converted into the pulling force on the electrode, the explosion-proof process of the capacitor is realized, and the accidents such as capacitor explosion, molten material ejection or fire are reduced.

Description

Technical Field

[0001] This application belongs to the field of photovoltaic power generation technology, and in particular relates to a capacitor and a photovoltaic inverter. Background Technology

[0002] When a capacitor encounters abnormal operating conditions such as overvoltage or high temperature, its internal electrolyte will rapidly vaporize due to overheating, causing a sudden surge in pressure. The explosion-proof method employed in related technologies relies on the increased internal pressure deforming the casing, which then pulls the electrodes away, creating an open circuit. However, this method suffers from a certain response lag. Under severe fault conditions, the pressure build-up and release are too rapid; before the casing can deform sufficiently to break the electrodes, the high-pressure molten material inside may erupt from the initially fractured connection between the cover and the casing, triggering an arc. This process may cause the explosion-proof mechanism to fail before it can complete the open-circuit action, potentially leading to secondary accidents such as capacitor explosion and fire. Utility Model Content

[0003] This application aims to address at least one of the technical problems existing in the related art. To this end, this application proposes a capacitor and a photovoltaic inverter that can reduce the risk of premature breakage at the connection between the cover plate and the housing due to excessive force, thus helping to achieve the explosion-proof process of the capacitor.

[0004] In a first aspect, this application provides a capacitor, comprising: case; The core is installed inside the housing; A cover plate is installed at the open end of the housing and connected to the housing; A first support member is installed inside the housing and located between the core and the cover plate. A limiting structure is provided between the first support member and the housing to cooperate with each other. The electrode penetrates the cover plate and the first support member and is electrically connected to the core.

[0005] According to the capacitor of this application, by providing a mutually cooperating limiting structure between the first support member and the housing, the upward displacement of the first support member can be effectively restricted, thereby reducing the force exerted by the first support member on the edge of the cover plate, helping to delay the cracking at the connection between the cover plate and the housing, reducing the risk of premature cracking at the connection between the cover plate and the housing. At the same time, the limiting structure can keep the housing and the first support member relatively fixed, reducing the displacement or rotation of the first support member under pressure, reducing the lateral displacement or misalignment between the first support members, so that the displacement of the cover plate can be more completely converted into the pulling force on the electrodes, helping to achieve the explosion-proof process of the capacitor, and reducing the occurrence of secondary accidents such as capacitor explosion, molten material ejection or fire.

[0006] According to one embodiment of this application, the limiting structure includes a recessed groove and a protrusion extending into the recessed groove, the first support member is provided with the recessed groove, and a portion of the housing is bent inward to form the protrusion.

[0007] According to one embodiment of this application, the first support member includes: A side enclosure is provided around the inner peripheral wall of the housing, the cover plate is supported on the first end of the side enclosure, and the locating groove is located on the outer peripheral wall of the side enclosure; A support frame is connected to the inner peripheral wall of the side enclosure, the support frame supports the core, and the electrode passes through the support frame.

[0008] According to one embodiment of this application, the distance from the insert groove to the first end of the side enclosure is less than the distance from the insert groove to the second end of the side enclosure.

[0009] According to one embodiment of this application, the limiting structure includes a groove and a protrusion extending into the groove, wherein the groove opening direction intersects the opening direction of the housing.

[0010] According to one embodiment of this application, the orthographic projection of the limiting structure along the axial direction of the electrode is located inside the orthographic projection along the axial direction of the electrode at the connection between the cover plate and the housing.

[0011] According to one embodiment of this application, the limiting structure is disposed around the outer periphery of the housing.

[0012] According to one embodiment of this application, the limiting structure includes a plurality of such limiting structures, which are spaced apart around the outer periphery of the housing.

[0013] According to one embodiment of this application, the capacitor further includes: A second support member is provided on the outside of the cover plate, and the electrode passes through the second support member.

[0014] Secondly, this application provides a photovoltaic inverter, comprising: The capacitor as described in any of the above.

[0015] According to the photovoltaic inverter of this application, by employing the aforementioned capacitor, a mutually cooperating limiting structure is provided between the first support member and the housing, which can effectively limit the upward displacement of the first support member, thereby reducing the force exerted by the first support member on the edge of the cover plate, helping to delay the cracking at the connection between the cover plate and the housing, reducing the risk of premature cracking at the connection between the cover plate and the housing. At the same time, the limiting structure enables the housing and the first support member to remain relatively fixed, reducing the displacement or rotation of the first support member under pressure, reducing the lateral displacement or misalignment between the first support members, so that the displacement of the cover plate can be more completely converted into the pulling force on the electrodes, helping to achieve the explosion-proof process of the capacitor, and reducing the occurrence of secondary accidents such as capacitor explosion, molten material ejection or fire.

[0016] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the structure of the capacitor provided in the embodiment of this application.

[0018] Figure label: Shell 110, protrusion 111, inner peripheral wall 112 of shell; Cover plate 120, connection point between cover plate and housing 121; First support member 130, side wall 131, first end 132, second end 133, outer peripheral wall of side wall 134, embedding groove 135, support frame 136; Electrode 140; Second support component 150; Core 160. Detailed Implementation

[0019] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0020] The following is for reference. Figure 1 This application describes a photovoltaic system, a photovoltaic inverter, and a capacitor according to embodiments thereof.

[0021] A photovoltaic (PV) system is a system that directly converts solar radiation energy into electrical energy and performs the storage, conversion, and transmission of this energy. A PV system includes PV modules, PV mounting systems, and PV inverters.

[0022] This application also provides a photovoltaic inverter.

[0023] A photovoltaic (PV) inverter is a power electronic conversion device within a photovoltaic (PV) system. It converts the direct current (DC) generated by PV modules into alternating current (AC) compatible with the power grid. A PV inverter includes capacitors and power electronic switching circuits. These power electronic switching circuits can be insulated-gate bipolar transistors (IGBTs) or metal-oxide-semiconductor field-effect transistors (MOSFETs), among others.

[0024] This application also provides a capacitor.

[0025] A capacitor is a passive electronic component that can store electric charge and electric field energy.

[0026] The capacitor can be a DC-supported capacitor. Located on the DC side of the photovoltaic inverter, the DC-supported capacitor can quickly absorb or release charge to smooth DC voltage fluctuations caused by power fluctuations in the photovoltaic modules and high-speed switching of the inverter bridge. This provides a more robust and stable operating voltage for the subsequent inverter circuit, thereby ensuring the efficiency and reliability of power conversion.

[0027] The capacitor can be an AC filter capacitor. The AC filter capacitor is located on the AC output side of the photovoltaic inverter. Together with the inductor, the AC filter capacitor forms an inductor-capacitor filter, which smooths the high-frequency pulse waveform generated by the inverter bridge switch into a smooth sine wave. The AC filter capacitor can filter out high-frequency harmonic noise in the current, making the AC power output to the grid relatively pure and of high quality, meeting grid-connected power quality standards and reducing the risk of interference to the grid or other electrical equipment.

[0028] like Figure 1 As shown, the capacitor includes a housing 110, a core 160, a cover plate 120, a first support member 130, and electrodes 140.

[0029] The housing 110 is a container that is closed at one end and open at the other end. The open end of the housing 110 can serve as a process channel for internal assembly and operation.

[0030] The housing 110 can be made of metal such as aluminum or steel, or high-temperature resistant engineering plastics.

[0031] The housing 110 serves to protect and dissipate heat, isolating the internal core 160 from the external environment and reducing the risk of the core 160 being exposed to moisture, oxidation, and physical damage.

[0032] The core 160 is the component in a capacitor that stores charge. The core 160 is an energy storage structure composed of a dielectric and electrode foil. For example, the core 160 of an electrolytic capacitor is made by winding an anode foil, a cathode foil, and electrolytic paper and then impregnating them with an electrolyte; the core 160 of a film capacitor is made by winding a metallized film.

[0033] The core 160 is installed inside the housing 110.

[0034] That is, the core 160 can be placed and fixed in the internal space of the shell 110, which is a container, through certain processes such as sliding, suspension or the use of tooling.

[0035] The cover plate 120 is a plate-shaped component used to close the open port of the housing 110. The cover plate 120 can be made of rubber, plastic or metal such as aluminum alloy.

[0036] like Figure 1 As shown, the cover plate 120 is installed at the open end of the housing 110 and is connected to the housing 110.

[0037] The cover plate 120 can be placed and fixed to the open end of the housing 110, thus forming a complete and sealed container unit together with the housing 110. The connection between the cover plate 120 and the housing 110 can be achieved by a rolling process, that is, rolling the edge of the cover plate 120 towards the housing 110, so that the cover plate 120 presses against the housing 110, thereby achieving a connection between the cover plate 120 and the housing 110 with a certain strength.

[0038] The reliable connection between the cover plate 120 and the housing 110 seals the capacitor, reducing the risk of leakage of internal electrolyte or inert gas, while also reducing the ingress of external moisture and oxygen, thereby improving the electrical performance and lifespan of the capacitor. Simultaneously, the cover plate 120 and the housing 110 form a robust integral structure capable of withstanding internal pressure, external vibration, and impact, reducing the risk of components inside the housing 110 becoming loose.

[0039] The first support member 130 is an insulating structural component located between the core 160 and the cover plate 120. The first support member 130 may be made of engineering plastics, such as polybutylene terephthalate, polyphenylene sulfide, or polyethylene terephthalate.

[0040] like Figure 1 As shown, the first support member 130 is installed inside the housing 110 and is located between the core 160 and the cover plate 120.

[0041] The first support member 130 is positioned between the core 160 and the cover plate 120. The first support member 130 provides a certain degree of fixation for the core 160, reducing its swaying or rotation within the housing 110. Simultaneously, the first support member 130 supports and transmits force to the cover plate 120; when the cover plate 120 is subjected to pressure, the force can be transferred to the first support member 130.

[0042] like Figure 1 As shown, a limiting structure is provided between the first support member 130 and the housing 110 to cooperate with each other.

[0043] That is, a structure is provided between the first support member 130 and the housing 110 that can engage with each other to achieve mechanical interlocking. The limiting structure can limit the first support member 130 along the axis of the open end of the housing 110.

[0044] Electrode 140 is a conductive metal lead or terminal, which can be in the form of a bolt electrode or a terminal electrode.

[0045] like Figure 1 As shown, electrode 140 penetrates cover plate 120 and first support member 130, and is electrically connected to core 160.

[0046] Electrode 140 can penetrate the pre-drilled holes in cover plate 120 and first support member 130 to connect with the lead foil, such as copper foil, of core 160. The connection between electrode 140 and core 160 can be achieved by welding, that is, by spot welding, laser welding, or ultrasonic welding, the lower end of electrode 140 and the lead foil of core 160 are fused together to form a low-resistance connection.

[0047] The central area of ​​electrode 140 and cover plate 120 can be rigidly connected by welding or riveting.

[0048] The electrode 140 and the first support member 130 may not be rigidly connected. The reserved holes in the first support member 130 can guide and position the electrode 140.

[0049] In the relevant capacitor, the capacitor cover and the first support member lack a mutually cooperating limiting structure. When the capacitor malfunctions, a large amount of gas is generated in a short period of time, and this gas breaks through the connection between the edge of the cover and the open end of the shell. Under severe fault conditions, the pressure build-up and release rate is too rapid. Before the shell can deform sufficiently to break the electrodes, the high-pressure molten material inside has already ejected from the initially fractured connection between the cover and the shell, triggering an arc. This process may cause the explosion-proof mechanism to fail before it can complete the open-circuit action, potentially leading to secondary accidents such as capacitor explosion and fire.

[0050] In the capacitor provided in this embodiment, the housing 110 and the first support member 130 are provided with mutually cooperating limiting structures. The limiting structures can fix the first support member 130 to the housing 110 relatively firmly. The force of air pressure attempting to push the first support member 130 upward can be resisted by the reaction force generated by the limiting structure. The first support member 130 is difficult to be pushed upward as a whole, reducing the upward force of the first support member 130 acting on the edge of the cover plate 120, helping to delay the cracking of the connection 121 between the cover plate and the housing, reducing the risk of premature cracking of the connection 121 between the cover plate and the housing, and helping the air pressure to accumulate to a certain pressure so that the central area of ​​the cover plate 120 bulges and deforms, causing the electrode 140 to detach from its connection with the core 160.

[0051] In other words, the limiting structure stabilizes the first support member 130, making the "electrode 140 pulling off the core 160 and forming an open circuit" a release path for the increased gas pressure. The coordinated design of the limiting structure and the strength of the connection 121 between the cover plate and the housing ensures that the electrical circuit is cut off before the pressure limit of the housing 110 is reached, thereby effectively reducing the risk of physical explosion of the housing 110.

[0052] Meanwhile, the stable and continuous plastic bulging deformation process occurring in the central region of the cover plate 120 is not instantaneous but requires a certain amount of time. Within this time window, the electrode 140 fixed on the cover plate 120 can be pulled upwards. The limiting structure ensures that the housing 110 and the first support member 130 remain relatively fixed, reducing the displacement or rotation of the first support member 130 under pressure. When the internal air pressure pushes the central region of the cover plate 120 to bulge and deform, the limiting structure reduces lateral displacement or misalignment between the first support members 130, allowing the displacement of the cover plate 120 to be converted into a relatively complete pulling force on the electrode 140. This allows the pulling force to act more accurately at the connection between the electrode 140 and the core 160, helping the electrode 140 to be pulled off the core 160. Without the limiting constraint, the first support member 130 may shift due to vibration or pressure, causing the transmission path of the pulling force to deviate, affecting the reliability of the explosion-proof operation.

[0053] In addition, during the assembly of the first support 130, the limit engagement setting can provide clearer feedback to assembly workers or automated equipment, indicating that the first support 130 has been installed to the preset suitable depth, thereby improving the consistency of product assembly.

[0054] The capacitor explosion-proof process in this application embodiment is as follows: When a capacitor encounters severe overvoltage, reverse voltage, or extreme overtemperature, the electrolyte inside the capacitor decomposes rapidly, generating a large amount of gas. This gas causes a rapid increase in internal pressure within the sealed capacitor, which acts on the inner walls of the housing 110 and the cover plate 120. The edge of the cover plate 120 is fixedly connected to the open end of the housing 110, and the connection point 121 between the cover plate and the housing constrains the edge of the cover plate 120. Simultaneously, the first support member 130 and the housing 110 are equipped with a mutually cooperating limiting structure. This limiting structure effectively restricts the upward displacement of the first support member 130, thereby reducing the force exerted by the first support member 130 on the edge of the cover plate 120, helping to delay the cracking of the connection point 121 between the cover plate and the housing, reducing the risk of premature cracking, and helping the gas pressure accumulate to a level exceeding the elastic deformation limit of the cover plate 120 material. When the internal gas pressure of the capacitor exceeds the elastic deformation limit of the cover plate 120 material, the central region of the cover plate 120 undergoes plastic deformation and bulges outward. Since electrode 140 is fixed to the central area of ​​cover plate 120, the bulging deformation of cover plate 120 will cause electrode 140 to move upward. Furthermore, since the connection between electrode 140 and first support member 130 is non-rigid, and first support member 130 and housing 110 are provided with mutually cooperating limiting structures, the limiting structures can limit the obstruction of electrode 140 by first support member 130. As the internal gas pressure of the capacitor increases, the bulging deformation of cover plate 120 intensifies, and electrode 140 is further pulled upward, eventually causing electrode 140 to detach from its connection with core 160, resulting in an open circuit in the internal electrical circuit of the capacitor. After the circuit is open, current cannot continue to flow into the capacitor, the internal gas generation reaction stops, thereby achieving explosion-proof protection for the capacitor.

[0055] According to the capacitor provided in the embodiments of this application, by providing a mutually cooperating limiting structure between the first support member 130 and the housing 110, the upward displacement of the first support member 130 can be effectively restricted, thereby reducing the force exerted by the first support member 130 on the edge of the cover plate 120, helping to delay the cracking of the connection 121 between the cover plate and the housing, reducing the risk of premature cracking of the connection 121 between the cover plate and the housing. At the same time, the limiting structure can keep the housing 110 and the first support member 130 relatively fixed, reducing the displacement or rotation of the first support member 130 under pressure, reducing the lateral displacement or misalignment between the first support members 130, so that the displacement of the cover plate 120 can be more completely converted into the pulling force on the electrode 140, helping to realize the explosion-proof process of the capacitor, and reducing the occurrence of secondary accidents such as capacitor explosion, molten material ejection or fire.

[0056] Correspondingly, according to the photovoltaic inverter provided in the embodiments of this application, by employing the above-mentioned capacitor, a mutually cooperating limiting structure is provided between the first support member 130 and the housing 110, which can effectively limit the upward displacement of the first support member 130, thereby reducing the force of the first support member 130 on the edge of the cover plate 120, helping to delay the cracking of the connection 121 between the cover plate and the housing, reducing the risk of premature cracking of the connection 121 between the cover plate and the housing. At the same time, the limiting structure enables the housing 110 and the first support member 130 to remain relatively fixed, reducing the displacement or rotation of the first support member 130 under pressure, reducing the lateral displacement or misalignment between the first support members 130, so that the displacement of the cover plate 120 can be more completely converted into the pulling force on the electrode 140, helping to realize the explosion-proof process of the capacitor, and reducing the occurrence of secondary accidents such as capacitor explosion, molten material ejection or fire.

[0057] Correspondingly, according to the photovoltaic system provided in the embodiments of this application, by adopting the above-mentioned photovoltaic inverter, a mutually cooperating limiting structure is provided between the first support member 130 of the capacitor and the housing 110, which can effectively limit the upward displacement of the first support member 130, thereby reducing the force of the first support member 130 on the edge of the cover plate 120, helping to delay the cracking of the connection 121 between the cover plate and the housing, reducing the risk of premature cracking of the connection 121 between the cover plate and the housing. At the same time, the limiting structure can keep the housing 110 and the first support member 130 relatively fixed, reducing the displacement or rotation of the first support member 130 under pressure, reducing the lateral displacement or misalignment between the first support members 130, so that the displacement of the cover plate 120 can be converted into a relatively complete pulling force on the electrode 140, helping to realize the explosion-proof process of the capacitor, and reducing the occurrence of secondary accidents such as capacitor explosion, molten material ejection or fire.

[0058] In some embodiments, such as Figure 1 As shown, the limiting structure includes a groove 135 and a protrusion 111 extending into the groove 135. The first support member 130 is provided with the groove 135, and a portion of the housing 110 is bent inward to form the protrusion 111.

[0059] The recessed groove 135 is a groove or slot recessed on the first support member 130, which can be used to accommodate the protrusion 111 on the housing 110.

[0060] The protrusion 111 can be formed by pressing a portion of the material of the housing 110 inward through a stamping and bending process, creating an inward bulge.

[0061] During the assembly process, when the first support member 130 is placed into the housing 110, the locating groove 135 on the first support member 130 needs to be aligned with the protrusion 111 inside the housing 110, and then pressure is applied to push it into place to complete the engagement.

[0062] The engagement between the recessed groove 135 of the first support member 130 and the protrusion 111 of the housing 110 effectively reduces the axial displacement of the first support member 130 within the housing 110, effectively reducing the vibration phenomenon that occurs during the use of the capacitor. It also enables the housing 110 and the first support member 130 to remain relatively fixed during explosion-proof operation, reducing the displacement or rotation of the first support member 130 under pressure. This reduces the upward force of the first support member 130 acting on the edge of the cover plate 120, which could cause the cover plate 120 to be pushed open as a whole. As a result, the displacement of the cover plate 120 can be more completely converted into a pulling force on the electrode 140, thereby allowing the pulling force to act more accurately at the connection between the electrode 140 and the core 160, helping the electrode 140 to be pulled off the core 160.

[0063] In some embodiments, such as Figure 1 As shown, the first support member 130 includes a side panel 131 and a support frame 136.

[0064] The side panel 131 is the external structure of the first support member 130.

[0065] like Figure 1 As shown, the side circumference 131 is provided around the inner peripheral wall 112 of the shell.

[0066] The overall shape of the outer peripheral wall 134 of the side enclosure can be approximately the same as the overall shape of the inner peripheral wall 112 of the shell. For example, both the outer peripheral wall 134 of the side enclosure and the inner peripheral wall 112 of the shell can be cylindrical or rectangular. The outer peripheral wall 134 of the side enclosure can be placed in close contact with the inner peripheral wall 112 of the shell.

[0067] like Figure 1 As shown, the cover plate 120 is supported at the first end 132 of the side wall 131.

[0068] The first end 132 of the side panel 131 is the end of the side panel 131 closest to the open end of the housing 110. After the cover plate 120 is assembled, the inner surface of the cover plate 120 can be directly supported on the first end 132 of the side panel 131. When the internal air pressure rises and pushes the cover plate 120, the first end 132 of the side panel 131 can provide a relatively solid supporting surface for the cover plate 120, which helps the cover plate 120 to be evenly stressed and guides the cover plate 120 to bulge towards the center, rather than tilting as a whole.

[0069] like Figure 1 As shown, the insert groove 135 is located on the outer peripheral wall 134 of the side enclosure.

[0070] The recess 135, which is used to engage with the protrusion 111 of the housing 110, is formed on the outer peripheral wall 134 of the side enclosure. The position of the recess 135 on the outer peripheral wall 134 of the side enclosure is designed so that the engagement action occurs between the first support member 130 and the housing 110, forming an effective mechanical interlock and reducing the rotation and axial movement of the first support member 130.

[0071] The support frame 136 is the internal structure of the first support member 130.

[0072] like Figure 1 As shown, the support frame 136 is connected to the inner peripheral wall of the side circumference 131, and the support frame 136 is supported on the core 160.

[0073] After the first support member 130 is placed on top of the core 160, the top of the core 160 can be held in place by the support frame 136. The support frame 136 can reduce the up-and-down jumping or left-and-right rotation of the core 160 within the housing 110 during transportation and use, thus keeping the core 160 relatively fixed within the capacitor.

[0074] like Figure 1 As shown, electrode 140 penetrates support frame 136.

[0075] The support frame 136 has precisely designed holes at specific locations, through which the electrode 140 can pass to achieve electrical connection with the core 160. The support frame 136 of the first support member 130 ensures the electrode 140 is in a relatively vertical and centered position, reducing potential skewing during transportation, storage, use, and explosion-proof processes. Furthermore, the support frame 136 of the first support member 130 provides guidance and support for the relatively slender electrode 140, effectively suppressing its swaying in vibration environments and reducing the risk of fatigue-induced breakage at the root of the electrode 140.

[0076] In some embodiments, such as Figure 1 As shown, the distance from the insert groove 135 to the first end 132 of the side wall 131 is less than the distance from the insert groove 135 to the second end 133 of the side wall 131.

[0077] The first end 132 of the side panel 131 refers to the end of the side panel 131 near the open end of the housing 110, which is used to support the cover plate 120. The second end 133 of the side panel 131 refers to the end of the side panel 131 away from the open end of the housing 110, which is supported by the core 160. The distance from the insert groove 135 to the first end 132 of the side panel 131 is less than the distance from the insert groove 135 to the second end 133 of the side panel 131, which means that the distance between the insert groove 135 and the cover plate 120 is less than the distance between the insert groove 135 and the core 160.

[0078] This design is based on the lever principle, using the mating point between the recessed groove 135 and the protrusion 111 of the housing 110 as the fulcrum. During the explosion-proof process of the capacitor, when the internal air pressure generates an upward thrust acting on the support frame 136 and the second end 133 of the side circumference 131, the lever arm from the point of force application to the fulcrum is relatively long, while the lever arm from the fulcrum to the connection 121 between the cover plate and the housing is relatively short. This reduces the risk of the sealing interface at the connection 121 between the cover plate and the housing failing preferentially during the explosion-proof process. As a result, the internal pressure can be applied to the central area of ​​the cover plate 120, causing the central area of ​​the cover plate 120 to undergo controllable bulging deformation, thereby triggering the explosion-proof action of pulling off the electrode 140.

[0079] Of course, depending on the actual situation, the distance from the first end 132 of the insert groove 135 to the side wall 131 can be set to be greater than or equal to the distance from the second end 133 of the insert groove 135 to the side wall 131.

[0080] In some embodiments, such as Figure 1 As shown, the limiting structure includes a groove 135 and a protrusion 111 extending into the groove 135. The groove opening direction of the groove 135 intersects with the opening direction of the housing 110.

[0081] The opening direction of the housing 110 can be axial, and the groove direction of the insert groove 135 intersects with the opening direction of the housing 110, which means that the groove direction of the insert groove 135 can be radial or a direction with a radial component.

[0082] The design of the groove 135 intersecting the opening direction of the housing 110 restricts the axial movement of the first support member 130 within the housing 110. During the explosion-proof process of the capacitor, when the internal air pressure generates an axial thrust acting on the first support member 130, the engagement of the groove 135 and the protrusion 111 ensures that the housing 110 and the first support member 130 remain relatively fixed during the explosion-proof process. This reduces the displacement or rotation of the first support member 130 under pressure, and reduces the upward force of the first support member 130 acting on the edge of the cover plate 120, preventing the cover plate 120 from being pushed open as a whole. This allows the displacement of the cover plate 120 to be more completely converted into a pulling force on the electrode 140, thereby enabling this pulling force to act more accurately at the connection between the electrode 140 and the core 160, helping the electrode 140 to be pulled away from the core 160.

[0083] One of the first support member 130 and the housing 110 is provided with a groove 135, and the other is provided with a protrusion 111.

[0084] The arrangement of the recess 135 and the protrusion 111 can be one of the following: Firstly, such as Figure 1 As shown, the first support member 130 is provided with a groove 135, and the housing 110 is provided with a protrusion 111.

[0085] In this embodiment, the groove 135 on the first support member 130 can be formed in one step by a mold during injection molding; the protrusion 111 on the housing 110 can be formed by stamping process, by pressing local metal inward through a mold.

[0086] Secondly, the first support member 130 is provided with a protrusion, and the housing 110 is provided with a groove.

[0087] In this embodiment, the protrusion on the first support member 130 can be formed directly during its injection molding; the groove on the housing 110 can be formed by removing material from the inner wall of the housing 110 through processing methods such as stamping, cutting or milling.

[0088] In practical applications, the placement of the insert groove and protrusion can be selected based on the production process, mold complexity, and cost.

[0089] In some embodiments, such as Figure 1 As shown, the orthographic projection of the limiting structure along the axial direction of the electrode 140 is located inside the orthographic projection of the connection 121 between the cover plate and the housing along the axial direction of the electrode 140.

[0090] That is, on the orthogonal projection plane along the axial direction of electrode 140, the projection contour of the limiting structure, such as the locating groove 135 and the protrusion 111, is located within the area enclosed by the projection contour of the connection between cover plate 120 and housing 110.

[0091] During the explosion-proof process of the capacitor, when the internal air pressure generates an upward thrust on the first support member 130, the limiting structure located on the inner side can provide a reaction force to the first support member 130, so that the force of the internal air pressure can act on the central area of ​​the cover plate 120. This can reduce the risk of the sealing interface at the connection 121 between the cover plate and the shell failing preferentially during the explosion-proof process, thereby allowing the internal pressure to act on the central area of ​​the cover plate 120, causing the central area of ​​the cover plate 120 to undergo controllable bulging deformation to drive the electrode 140 to pull out in an explosion-proof action.

[0092] Of course, depending on the actual situation, the orthogonal projection of the limiting structure along the axial direction of the electrode 140 can be located outside the orthogonal projection of the connection 121 between the cover plate and the housing along the axial direction of the electrode 140.

[0093] The limiting structure can be set in one of the following ways along the circumferential direction: Firstly, the limiting structure is set around the outer periphery of the housing 110.

[0094] In this embodiment, the limiting structure can be a continuous, annular structure. For example, a complete annular groove is machined on the inner peripheral wall 112 of the housing; correspondingly, a complete annular rib is designed on the outer peripheral wall of the first support member 130. During assembly, this annular rib needs to be fully engaged in the annular groove.

[0095] In this method, the limiting structure provides a relatively uniform, comprehensive, and high-strength limiting effect. The limiting structure can resist torsional forces to a large extent, reducing the axial displacement or tilting of the first support member 130.

[0096] Secondly, the limiting structure includes multiple limiting structures, which are spaced apart around the outer periphery of the housing 110.

[0097] In this embodiment, the limiting structure can be multiple discrete units. For example, three or four sets of limiting pairs consisting of protrusions 111 and locating grooves 135 are provided at equal intervals in the circumferential direction of the housing 110 and the first support member 130.

[0098] In this method, processing multiple local limiting structures is relatively simple and cost-effective. Simultaneously, the discretely arranged limiting structures can reduce the axial displacement or tilting of the first support member 130 to a certain extent, and reduce the rotation of the first support member 130.

[0099] In practical applications, the setting method of the limit structure along the circumference can be selected according to the production process, mold complexity and cost.

[0100] In some embodiments, such as Figure 1 As shown, the capacitor may include a second support member 150, which is disposed outside the cover plate 120, and the electrode 140 passes through the second support member 150.

[0101] The second support member 150 is an insulating component disposed on the outside of the capacitor cover 120. The electrode 140 can pass through the second support member 150 and the cover 120. The second support member 150 can provide a more robust mechanical fixing point for the electrode 140, improve the reliability of external electrical connections, reduce the vibration of the electrode 140 during transportation, storage and use, and improve the reliability of the electrode 140 being pulled out due to the expansion of the central area of ​​the cover 120 during explosion-proof processes.

[0102] The following is combined Figure 1 The capacitor described in the embodiments of this application.

[0103] The capacitor includes a housing 110, a core 160, a cover plate 120, a first support member 130, an electrode 140, and an outer support member 150.

[0104] The core 160 is installed inside the housing 110.

[0105] The cover plate 120 is installed at the open end of the housing 110 and connected to the housing 110, and the cover plate 120 is supported at the first end 132 of the side circumference 131.

[0106] Electrode 140 penetrates the cover plate 120 and the support frame 136 of the first support member 130, and is electrically connected to the core 160.

[0107] The second support member 150 is located on the outside of the cover plate 120, and the electrode 140 passes through the second support member 150.

[0108] The first support member 130 is installed inside the housing 110 and is located between the core 160 and the cover plate 120. A limiting structure is provided between the first support member 130 and the housing 110 to cooperate with each other. The orthographic projection of the limiting structure along the axial direction of the electrode 140 is located inside the orthographic projection of the connection 121 between the cover plate and the housing along the axial direction of the electrode 140.

[0109] The limiting structure can be set in at least one of the following ways: Firstly, the limiting structure includes a groove 135 and a protrusion 111 extending into the groove 135. The first support member 130 is provided with the groove 135. A portion of the housing 110 is bent inward to form the protrusion 111. The first support member 130 includes a side wall 131 and a support frame 136. The side wall 131 is arranged around the inner peripheral wall 112 of the housing, and the groove 135 is located on the outer peripheral wall 134 of the side wall. The support frame 136 is connected to the inner peripheral wall of the side wall 131 and is supported on the core 160. The distance from the groove 135 to the first end 132 of the side wall 131 is less than the distance from the groove 135 to the second end 133 of the side wall 131. Secondly, the limiting structure includes a groove 135 and a protrusion 111 extending into the groove 135. The groove opening direction of the groove 135 intersects with the opening direction of the housing 110. One of the first support member 130 and the housing 110 is provided with a groove 135, and the other is provided with a protrusion 111.

[0110] The limiting structure can be set in one of the following ways along the circumferential direction: Firstly, a limiting structure is set around the outer periphery of the housing 110; Secondly, the limiting structure includes multiple limiting structures, which are spaced apart around the outer periphery of the housing 110.

[0111] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0112] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0113] In the description of this application, "first feature" and "second feature" may include one or more of the features.

[0114] In the description of this application, "multiple" means two or more.

[0115] In the description of this application, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0116] In the description of this application, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0117] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0118] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A capacitor, characterized in that, include: Casing (110); The core (160) is installed inside the housing (110); A cover plate (120) is installed at the open end of the housing (110) and connected to the housing (110); The first support member (130) is installed inside the housing (110) and located between the core (160) and the cover plate (120). A limiting structure that cooperates with each other is provided between the first support member (130) and the housing (110). An electrode (140) penetrates the cover plate (120) and the first support member (130) and is electrically connected to the core (160).

2. The capacitor according to claim 1, characterized in that, The limiting structure includes a groove (135) and a protrusion (111) extending into the groove (135). The first support member (130) is provided with the groove (135), and a portion of the housing (110) is bent inward to form the protrusion (111).

3. The capacitor according to claim 2, characterized in that, The first support member (130) includes: A side enclosure (131) is provided around the inner peripheral wall (112) of the housing, the cover plate (120) is supported on the first end (132) of the side enclosure (131), and the locating groove (135) is located on the outer peripheral wall (134) of the side enclosure. A support frame (136) is connected to the inner peripheral wall of the side enclosure (131), the support frame (136) is supported on the core (160), and the electrode (140) passes through the support frame (136).

4. The capacitor according to claim 3, characterized in that, The distance from the insert groove (135) to the first end (132) of the side wall (131) is less than the distance from the insert groove (135) to the second end (133) of the side wall (131).

5. The capacitor according to claim 1, characterized in that, The limiting structure includes a groove (135) and a protrusion (111) extending into the groove (135), the groove opening direction of the groove (135) intersecting the open direction of the housing (110).

6. The capacitor according to claim 1, characterized in that, The orthographic projection of the limiting structure along the axial direction of the electrode (140) is located inside the orthographic projection of the electrode (140) at the connection between the cover plate (120) and the housing (110).

7. The capacitor according to any one of claims 1-6, characterized in that, The limiting structure is arranged around the outer periphery of the housing (110).

8. The capacitor according to any one of claims 1-6, characterized in that, The limiting structure includes multiple structures, which are spaced apart around the outer periphery of the housing (110).

9. The capacitor according to any one of claims 1-6, characterized in that, Also includes: The second support member (150) is located on the outside of the cover plate (120), and the electrode (140) passes through the second support member (150).

10. A photovoltaic inverter, characterized in that, include: The capacitor as described in any one of claims 1-9.

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