Capacitor

Abstract

The utility model relates to a capacitor, and relates to the technical field of capacitors. The capacitor of the utility model comprises a cover plate. The shell assembly is provided with a curled edge extending in the circumferential direction and a first girdling groove extending in the circumferential direction, the curled edge is buckled at one end of the cover plate to form a first sealing structure, and the inner wall, at the first girdling groove, of the shell assembly is tightly pressed at the other end of the cover plate to form a second sealing structure; the first girdling groove comprises a first side wall extending in the axial direction of the shell assembly. Compared with sealing only through the first girdling groove, the sealing effect between the cover plate and the shell assembly is improved, the deformation resistance of the shell assembly at the first girdling groove can be improved, and the sealing effect at the first girdling groove is better.

Description

Technical Field

[0001] The utility model relates to the technical field of capacitors, in particular to a capacitor. Background Art

[0002] Capacitor production involves four basic processes: winding, impregnation, assembly, and aging and sorting. During the assembly process, the housing must be sealed to prevent the electrolyte from evaporating and affecting the performance of the capacitor.

[0003] In some implementations, to reduce the volatilization of electrolyte in the housing, a waisted groove is provided in the housing during assembly, and the housing at the waisted groove is fitted against the outside of the cover plate, thereby sealing the internal environment of the housing and preventing volatilization of the electrolyte in the housing. Furthermore, a sleeve structure is provided outside the housing to protect the housing and prevent electrolyte leakage caused by damage to the aluminum shell.

[0004] In actual use, it is found that after long-term use, the connection between the cover and the shell will become loose, causing the cover to rotate relative to the shell, thereby significantly reducing the sealing force between the cover and the shell, seriously affecting the service life of the capacitor. Utility Model Content

[0005] The utility model provides a capacitor, which is used to improve the sealing performance of the capacitor.

[0006] The utility model provides a capacitor, comprising a cover plate; and

[0007] A shell assembly is formed with a circumferentially extending curled edge and a circumferentially extending first waist groove, the curled edge is bent toward the inner side of the shell assembly and is fastened to one end of the cover plate to form a first sealing structure, and the inner wall of the shell assembly at the first waist groove is pressed against the other end of the cover plate to form a second sealing structure;

[0008] The first beam waist groove has a first side wall, and the first side wall extends along the axial direction of the housing assembly.

[0009] In one embodiment, the length of the first side wall in the axial direction of the housing assembly is greater than or equal to 2.5 mm.

[0010] In one embodiment, a depth of the first beam waist groove along the radial direction of the housing assembly is greater than or equal to 1.7 mm.

[0011] In one embodiment, the cover plate includes a plate body and an adhesive layer arranged on the outer side of the plate body, and the end of the curling edge is embedded in the adhesive layer.

[0012] In one embodiment, the depth to which the curled edge is embedded in the adhesive layer is greater than or equal to 0.4 mm.

[0013] In one embodiment, the housing assembly includes an aluminum shell and a heat shrinkable sleeve, wherein the heat shrinkable sleeve is heat-shrinkably wrapped around the aluminum shell.

[0014] The first beam waist groove is formed by extrusion, and the first beam waist groove is formed on a side of the heat shrinkable sleeve away from the aluminum shell;

[0015] The aluminum shell is formed with a second beam waist groove corresponding to the first beam waist groove, and the heat shrinkable sleeve is partially embedded in the second beam waist groove.

[0016] In one embodiment, the thickness of the heat shrinkable tube is smaller than the depth of the first beam waist groove.

[0017] In one embodiment, the heat shrinkable sleeve includes a first insulating portion wrapped around the curled edge, and a top surface of the first insulating portion is higher than a top surface of the cover plate;

[0018] The cover plate is riveted to the lead-out terminal by rivets, and the top surface of the rivet is lower than the top surface of the first insulating portion.

[0019] In one embodiment, a circular chamfer is provided on a side of the cover plate facing the first girth groove, and the inner wall of the shell is in contact with the circular chamfer.

[0020] In one embodiment, a tapered side surface is provided on the side of the cover plate facing the first beam waist groove, and the inner wall of the housing assembly at the first beam waist groove is in contact with the tapered side surface.

[0021] In one embodiment, the shell assembly and the cover plate form a receiving cavity, and the core package is received in the receiving cavity.

[0022] Compared to existing technologies, the present invention offers the advantage of a housing assembly with a rolled edge and a first girth groove. The rolled edge is fastened to the exterior of the cover plate to form a first sealing structure, while the first girth groove is pressed against the other end of the cover plate to form a second sealing structure, creating a double seal. Compared to sealing with the first girth groove alone, this improves the sealing effect between the cover plate and the housing assembly, and the combined restraint of the rolled edge and the first girth groove prevents the cover plate from rotating relative to the housing assembly.

[0023] At the same time, since the first waist groove includes a first side wall extending axially along the shell assembly, compared with the first waist groove with a circular arc cross-section, the volume of the shell assembly at the first waist groove structure can be expanded without severely radially squeezing the shell assembly, thereby enhancing the deformation resistance of the shell assembly at the first waist groove, allowing the formation of the first waist groove to be maintained for a longer time, and improving the sealing effect at the first waist groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be described in more detail below based on embodiments with reference to the accompanying drawings.

[0025] Figure 1 Schematic diagram of the cross-sectional structure of the capacitor in the embodiment of the present utility model;

[0026] Figure 2 1 is a schematic cross-sectional structural diagram of a capacitor with size markings in an embodiment of the present utility model;

[0027] Figure 3 yes Figure 2 Schematic diagram of the local structure at A in the middle;

[0028] Figure 4 yes Figure 3 The schematic diagram of the local structure after the aluminum shell is hidden in the middle;

[0029] Figure 5 This is a schematic diagram of the three-dimensional structure of the cover plate in one embodiment of the present utility model from one viewing angle;

[0030] Figure 6 This is a schematic diagram of the three-dimensional structure of the cover plate in another perspective in an embodiment of the present invention;

[0031] Figure 7 This is a schematic diagram of the three-dimensional structure of the cover plate in an embodiment of the present invention when viewed from above;

[0032] Figure 8 This is a schematic diagram of the main structure of the cover plate in an embodiment of the present utility model;

[0033] Figure 9 It is a schematic diagram of the top structure of the cover plate in the embodiment of the present utility model.

[0034] Reference numerals:

[0035] 100, cover plate; 110, plate body; 111, tapered side; 112, arc chamfer; 120, adhesive layer;

[0036] 200, housing assembly;

[0037] 210, aluminum shell; 211, cylinder; 212, curling; 213, second beam groove;

[0038] 220. Heat shrinkable tube; 221. First insulating portion;

[0039] 300, first beam waist groove; 310, first side wall; 320, second side wall; 330, third side wall;

[0040] 401, rivet; 402, lead terminal;

[0041] 500, core package; 501, electrolytic paper; 502, cathode foil; 503, anode foil. DETAILED DESCRIPTION

[0042] The present invention will be further described below with reference to the accompanying drawings.

[0043] See also Figure 1 and Figure 2 As shown, a capacitor provided by an embodiment of the present invention includes a cover plate 100 and a housing assembly 200. The housing assembly 200 is formed with a circumferentially extending crimp 212 and a circumferentially extending first waist groove 300. The crimp 212 is fastened to one end of the cover body to form a first sealing structure. The inner wall of the housing assembly 200 at the first waist groove 300 presses against the other end of the cover plate 100 to form a second sealing structure. In other words, in this application, the crimp 212 of the housing assembly 200 is used to form the first sealing structure, and the second sealing structure is formed during the process of forming the first waist groove 300 by the housing assembly 200. This completes the sealing of the capacitor and improves the sealing performance of the capacitor.

[0044] By positioning the opposite ends of the cover plate 100, a pressing-up and pushing-down effect is achieved, strengthening the connection between the cover plate 100 and the housing assembly 200 and preventing the cover plate 100 from shaking relative to the housing assembly 200 during use. The dual sealing structure of the primary and secondary sealing structures improves the sealing performance of the housing assembly 200 compared to a single waisted groove seal, reducing the probability of electrolyte leakage within the housing assembly 200.

[0045] This can improve the quality of capacitors, reduce the failure rate of capacitors, increase the service life of capacitors, win the favor of a wider range of users for the product, and reduce customer complaints.

[0046] In the present application, since the curling edge 212 extends circumferentially, the first sealing structure is an annular sealing structure, which reduces the risk of electrolyte leakage in the housing assembly 200. Similarly, since the first waist groove 300 extends circumferentially, the second sealing structure can also be an annular sealing structure, reducing electrolyte leakage in the housing assembly 200.

[0047] See also Figure 2 as well as Figure 3 In addition, by controlling the first beam waist groove 300 to include a first side wall 310 extending along the axial direction of the shell assembly 200, the length of the first beam waist groove 300 in the axial direction can be extended, thereby expanding the deformation area of the shell assembly 200 at the beam waist groove, so that the physical structure of the shell assembly 200 at the first beam waist groove 300 is more able to better resist deformation.

[0048] Compared with the first waist groove 300 which is shorter in length along the axial direction, the present application extends the first waist groove 300 by using the first side wall 310, so that the shell assembly 200 at the first waist groove 300 can be more firmly attached to the outside of the cover plate 100, forming a second sealing structure with better sealing effect and reducing the gap space.

[0049] Compared to a circular groove structure, the first sidewall 310 extending along the axial direction increases the deformation area of the housing assembly 200 without extending excessively into the interior of the housing assembly 200, minimizing the impact on the internal space of the housing assembly 200 and preventing interference with the core package 500 within the housing assembly 200 due to excessive waist groove depth. Previously, the waist groove height H3 of a circular groove structure was 1.2 mm. By modifying the waist groove structure, H3 can be adjusted to 2.5 mm with virtually no change in waist groove depth. This allows for a greater portion of the housing assembly 200 to reduce the internal space occupied by the extended waist groove along the axial direction.

[0050] In this application, to form the first beam waist groove 300 shown in the figure, a beam waist wheel with a straight edge on the outer cross section is used for extrusion, and the straight edge of the beam waist wheel is used to form the first sidewall 310 of the first beam waist groove 300. In some implementations, a beam waist wheel with a square cross section can be used to form the first beam waist groove 300.

[0051] Since the first beam waist groove 300 includes a first side wall 310 along the axial direction, compared with the tooth-shaped or wavy cross-sectional contour line of the first beam waist groove 300, uneven extrusion of the shell component 200 in various parts during the formation of the first beam waist groove 300 is avoided, stress concentration caused by complex cross-sections is reduced, and the service life of the shell component 200 is improved.

[0052] See also Figure 3 As shown, the first beam waist groove 300 further includes a second side wall 320 and a third side wall 330, wherein the second side wall 320 is connected to one end of the first side wall 310, and the third side wall 330 is connected to the other end of the first side wall 310. The second side wall 320 is smoothly connected to the first side wall 310, and the third side wall 330 is also smoothly connected to the first side wall 310.

[0053] In the actual process of forming the first beam waist groove 300 using the beam waist wheel, the first beam waist groove 300 with a smooth curve transition can be formed by controlling the outer contour shape of the beam waist wheel, thereby avoiding the appearance of a spike structure on the groove surface of the first beam waist groove 300 and reducing the stress concentration of the shell assembly 200 during the formation of the first beam waist groove 300.

[0054] See also Figure 1 and Figure 3As shown, the shell assembly 200 includes an aluminum shell 210 and a heat shrinkable tube 220. The heat shrinkable tube 220 is wrapped around the aluminum shell 210 to protect the aluminum shell 210 and play a role in pressure insulation. The heat shrinkable tube 220 is used to reduce damage to the aluminum shell 210 caused by external collisions.

[0055] Since the heat shrinkable sleeve 220 shrinks when heated, the heat shrinkable sleeve 220 can be attached to the outside of the aluminum shell 210 by heating the heat shrinkable sleeve 220. Compared with other sleeves, the heat shrinkable sleeve 220 can be more closely attached to the outside of the aluminum shell 210.

[0056] See also Figure 2 As shown, the length of the first sidewall 310 in the axial direction of the housing assembly 200 is greater than or equal to 2.5 mm. By controlling the length of the first sidewall 310, the structural strength of the housing assembly 200 at the first beam waist groove 300 can be sufficient to overcome the extrusion force inside the housing, reducing the risk of deformation of the first beam waist groove 300.

[0057] The axial length of the first side wall 310 in the shell assembly 200 is preferably 2.5 mm, which can reduce the deformation of the first beam waist groove 300 and prevent the first beam waist groove 300 from being too large and affecting the installation of the core package 500 inside the shell assembly 200.

[0058] See also Figure 3 As shown, in some implementations, the end of the curling edge 212 is embedded in the cover plate 100, and the depth of the curling edge 212 embedded in the cover plate 100 is greater than or equal to 0.4 mm. In other words, the curling edge 212 not only contacts the cover plate 100, but also has its end embedded in the cover plate 100, thereby improving the connection force between the curling edge 212 and the cover plate 100, preventing the cover plate 100 from moving relative to the housing assembly 200, and reducing the risk of the cover plate 100 loosening and rotating relative to the housing assembly 200 after long-term use.

[0059] join Figure 2 As shown, in some implementations, the length of the curling edge 212 along the radial direction of the housing assembly 200 is W, where W is preferably greater than or equal to 2 mm. This allows the curling edge 212 to better fit the outer side of the cover plate 100, thereby improving the connection strength between the curling edge 212 and the cover plate 100.

[0060] The housing assembly 200 includes an aluminum shell 210, which includes a cylindrical body 211 and a curled edge 212 disposed at the open end of the cylindrical body 211. The curled edge 212 is formed by bending the end of the aluminum shell 210 at the open end toward the inside of the housing assembly 200. Compared to plastic housings, the aluminum shell 210 has better ductility and can be easily bent to form the curled edge 212. Furthermore, the aluminum shell 210 has better thermal conductivity, allowing it to more quickly dissipate heat from the capacitor when it heats up, preventing heat from accumulating inside the housing assembly 200 and causing damage to the capacitor.

[0061] When manufacturing a capacitor, the core package 500 and other structures can be placed in the open shell assembly 200 first, and then the cover plate 100 can be placed at the opening of the shell assembly 200. The shell assembly 200 is squeezed by a waisting wheel to form a first waisting groove 300, so that the inner wall of the shell assembly 200 at the first waisting groove 300 is pressed against the outer side of the cover plate 100 to form a second sealing structure. Then, the open end of the shell assembly 200 is crimped 212 by a crimping mechanism 212, so that the open end of the shell assembly 200 faces the inside of the shell assembly 200, and the end of the crimping 212 is embedded in the cover plate 100.

[0062] In this application, by controlling the depth of the curling edge 212 embedded in the cover plate 100 to be greater than or equal to 0.4 mm, the sealing performance of the first sealing structure formed by the curling edge 212 can be improved, and the risk of electrolyte leakage from the inside of the housing assembly 200 through the curling edge 212 can be reduced. The depth of the curling edge 212 embedded in the cover plate 100 is preferably 0.4 mm. The thickness of the cover plate 100 is generally greater than or equal to 2.5 mm. By setting the embedding depth to 0.4 mm, the end of the curling edge 212 can be pressed against the cover plate 100, achieving a close fit between the cover plate 100 and the end of the curling edge 212, without seriously damaging the cover plate 100.

[0063] In some implementations, see Figure 3 and Figure 4 As shown, the cover plate 100 includes a plate body and an adhesive layer 120 disposed on the outer side of the plate body, and the end of the curling edge 212 is embedded in the adhesive layer 120 .

[0064] By providing the adhesive layer 120 on the outside of the plate body, the difficulty of embedding the curled edge 212 into the cover plate 100 can be reduced. The adhesive layer 120 has a certain elasticity, which allows it to tightly wrap around the curled edge 212 when embedded in the adhesive layer 120, thereby improving the sealing performance between the curled edge 212 and the cover plate 100. In addition, compared to using a single piece of adhesive structure as the cover plate 100, the provision of the plate body can improve the strength of the cover plate 100 and reduce the risk of deformation of the cover plate 100.

[0065] The adhesive layer 120 here may be a rubber layer 120 .

[0066] See also Figure 3 as well as Figure 4 As shown, in some implementations, the thickness of the adhesive layer 120 is greater than the depth of the bead 212 embedded in the adhesive layer 120, preventing the bead 212 from breaking through the adhesive layer 120 and inserting into the board. This can better protect the board and prevent damage to the board due to the insertion of the bead 212. This can also reduce the risk of electrolyte leakage due to board damage.

[0067] See also Figure 3 as well as Figure 4 As shown, the housing assembly 200 includes an aluminum shell 210 and a heat shrink tubing 220. The heat shrink tubing 220 is heat-shrinkably wrapped around the aluminum shell 210. The first waist groove 300 is formed by extrusion and is formed on the side of the heat shrink tubing 220 away from the aluminum shell 210. By wrapping the heat shrink tubing 220 around the outside of the aluminum shell 210, the probability of damage to the aluminum shell 210 due to collision can be reduced, and the aluminum shell 210 can be better protected, preventing damage to the aluminum shell 210 and leakage of the electrolyte inside.

[0068] At the same time, compared with ordinary plastic tubes, the heat shrinkable sleeve 220 can shrink when heated, so that the inner wall of the heat shrinkable sleeve 220 fits against the outer wall of the aluminum shell 210, avoiding a gap between the protective sleeve and the shell, which causes the protective sleeve to rotate relative to the shell.

[0069] See also Figure 3 As shown, the first girth groove 300 is formed on the side of the heat shrink tubing 220 away from the aluminum shell 210. When forming the first girth groove 300, the heat shrink tubing 220 wrapped around the aluminum shell 210 can be squeezed to squeeze the aluminum shell 210, thereby fitting the inner wall of the aluminum shell 210 to the cover plate 100 to form a second sealing structure. Compared to directly squeezing the aluminum shell 210 with a girth wheel, this avoids direct contact between the aluminum shell 210 and the girth wheel, reducing the risk of damage to the aluminum shell 210, thereby reducing the risk of electrolyte leakage within the housing assembly 200.

[0070] Moreover, the heat shrinkable tube 220 can be compressed and compacted by using a waist wheel, so that the heat shrinkable tube 220 is tightly attached to the outside of the aluminum shell 210, further reducing the risk of the heat shrinkable tube 220 being separated from the aluminum shell 210.

[0071] See also Figure 3 as well as Figure 4As shown, under the extrusion of the waist wheel, not only can the first waist groove 300 be formed on the outside of the heat shrinkable tube 220, but the heat shrinkable tube 220 can also be used to extrude the aluminum shell 210, so that the aluminum shell 210 forms a second waist groove 213 corresponding to the first waist groove 300, and the heat shrinkable tube 220 is partially embedded in the second waist groove 213, so that the heat shrinkable tube 220 is positioned axially by using the second waist groove 213, further reducing the risk of the heat shrinkable tube 220 detaching from the aluminum shell 210.

[0072] In addition, since the first beam waist groove 300 in the present application has a first side wall 310 extending in a straight line, it can expand the size of the first beam waist groove 300 in the length direction and the size of the second beam waist groove 213, so that more parts of the heat shrink tube are embedded in the second beam waist groove 213, thereby improving the connection force between the heat shrink tube and the aluminum shell 210 and reducing the risk of the heat shrink tube detaching from the aluminum shell 210.

[0073] It is understood that in other implementations, the housing assembly 200 may also include only the aluminum shell 210, and the aluminum shell 210 is directly radially extruded using a waisting wheel to form the first waist groove 300 in the aluminum shell 210. Then, a heat shrink tubing 220 is disposed over the aluminum shell 210. By heating the heat shrink tubing 220, the heat shrink tubing 220 shrinks and partially embeds into the first waist groove 300 formed on the outside of the aluminum shell 210, thereby enhancing the connection between the heat shrink tubing 220 and the aluminum shell 210.

[0074] It should be noted that before the heat shrink tubing 220 is sleeved on the outside of the aluminum shell 210 , the outer surface of the aluminum shell 210 needs to be cleaned to remove oil stains and zinc stearate powder on the surface of the aluminum shell 210 .

[0075] The capacitor in the present application can be used to be connected to a PCB board and connected to the PCB board through wave soldering. Compared with the sleeve material that expands due to heat and separates from the aluminum shell 210, since the heat shrink sleeve 220 is used in the present application, the heat shrink sleeve 220 will not expand during wave soldering. On the contrary, during wave soldering or other welding, the heat shrink sleeve will shrink due to heat and will fit more tightly to the outside of the aluminum shell 210. There will be no gap between the heat shrink sleeve 220 and the aluminum shell 210 and no looseness, thereby improving the quality of the capacitor.

[0076] See also Figure 3 and Figure 4As shown, the thickness of the heat shrinkable tube 220 is smaller than the depth of the first beam waist groove 300. When the heat shrinkable tube 220 is radially extruded by the beam waist wheel, since the thickness of the heat shrinkable tube 220 is smaller than the depth of the first beam waist groove 300, the heat shrinkable tube 220 in the area extruded by the beam waist wheel can shrink inward and further extrudes the aluminum shell 210, so that the aluminum shell 210 forms a second beam waist groove 213 that can accommodate part of the heat shrinkable tube 220. This avoids the second beam waist groove 213 being obscured due to the heat shrinkable tube 220 passing through.

[0077] See also Figure 2 and Figure 3 As shown, the heat shrinkable sleeve 220 includes a first insulating portion 221 wrapped around the curling edge 212 , and the top surface of the first insulating portion 221 is higher than the top surface of the cover plate 100 ;

[0078] The cover plate 100 is connected to the lead terminal 402 via a rivet 401 , and the top surface of the rivet 401 is lower than the top surface of the first insulating portion 221 .

[0079] By wrapping the heat shrink tube 220 around the inwardly bent curled edge 212, when the lead terminal 402 on the cover 100 is connected to the relevant circuit board, the first insulating portion 221 is closer to the circuit board than the rivet 401 structure, thereby avoiding a short circuit caused by the direct connection of components on the circuit board to the rivet 401.

[0080] See also Figure 2 As shown, the distance between the top surface of the curled edge 212 and the top surface of the cover plate 100 is H2, preferably greater than or equal to 1.3 mm. The height of the rivet 401 above the top surface of the cover plate 100 is H1, preferably less than or equal to 1 mm. In other words, the height difference between the top surface of the curled edge 212 and the top surface of the rivet 401 is at least 0.3 mm. This prevents short circuits on the PCB connected to the capacitor due to accidental contact with the rivet 401.

[0081] See also Figure 2 as well as Figure 5 As shown, two rivets 401 are riveted on the cover plate 100, and both rivets 401 pass through the cover plate 100 downward and connect to the core package 500 inside the housing assembly 200. At the same time, two lead terminals 402 are provided on the upper side of the cover plate 100, and the lead terminals 402 are riveted to the cover plate 100 through the rivets 401. One of the lead terminals 402 is a positive lead terminal 402, and the other is a negative lead terminal 402.

[0082] Compared to other connection structures, rivet 401 presses against the mounting hole on both sides after riveting, sealing the hole and preventing electrolyte leakage from the connector's mounting hole, thereby improving the product's sealing performance. Furthermore, the riveting process is relatively simple, requiring only one-way machining, making it easier to automate production than installing threaded fasteners.

[0083] See also Figure 5 、 Figure 6 and Figure 7 As shown, in some implementations, the lead terminal 402 has an L-shaped structure, with the bottom surface of the lead terminal 402 affixed to the top surface of the cover plate 100, and the vertical surface of the lead terminal 402 is used to connect to external electrical components, thereby connecting the capacitor to an external circuit. It is understood that the structure of the lead terminal 402 is not limited to the L-shaped structure shown in the figure, and a columnar structure or a needle-shaped structure can also be used, as long as the electrical connection function can be achieved.

[0084] See also Figures 7 to 9 As shown, in some implementations, the cover plate 100 is a circular plate, and the housing assembly 200 is a cylindrical barrel-shaped structure. The process of forming the curling edge 212 and the first beam waist groove 300 is relatively simple, and the processing areas of the curling edge 212 and the first beam waist groove 300 can be adjusted by selecting the housing assembly 200.

[0085] It is understandable that in other implementations, the cover plate 100 can also be set as a square plate structure, and the shell assembly 200 can be correspondingly set as a square cylindrical structure, so that the shell assembly 200 can form a first sealing structure and a second sealing structure with the cover plate 100.

[0086] See also Figure 3 、 Figure 5 As shown, a circular chamfer 112 is provided on one side of the cover plate 100 facing the first girth groove 300 , and the inner wall of the housing assembly 200 is in contact with the circular chamfer 112 .

[0087] Compared to aligning the sharp corners of the housing assembly 200 with the cover plate 100, providing a rounded chamfer 112 on the side of the cover plate 100 facing the first waisted groove 300 reduces damage to the inner wall of the housing assembly 200 caused by scratches on the sharp sidewalls. During the process of extruding the first waisted groove 300 using the waisted wheel, even if the inner wall of the housing assembly 200 is aligned due to the pressing force, it is not easily scratched, thus significantly reducing electrolyte leakage caused by scratches on the inner wall of the housing assembly 200.

[0088] In some implementations, the arc radius of the arc chamfer 112 is 0.5 mm-1 mm.

[0089] In some implementations, a tapered side surface 111 is provided on the side of the cover plate 100 facing the first beam waist groove 300 . The tapered side surface 111 forms a truncated cone shape, thereby preventing the bottom of the cover plate 100 from forming a right angle or an acute angle.

[0090] The tapered side surface 111 is adapted to the inner wall of the housing assembly 200 at the first beam waist groove 300, so that when the inner wall of the housing assembly 200 is attached to the cover plate 100, it can better fit with the side of the cover plate 100, reducing the contact between the tip structure of the cover plate 100 and the housing assembly 200. This reduces damage to the housing assembly 200 when the first beam waist groove 300 is formed.

[0091] See also Figure 1 as well as Figure 2 As shown, in some implementations, the housing assembly 200 and the cover plate 100 form a receiving cavity, and the core package 500 is received in the receiving cavity.

[0092] The cover plate 100 and the core package 500 can be electrically connected before connecting the cover plate 100 to the housing. Specifically, the cathode foil 502 of the core package 500 is connected to one rivet 401 of the cover plate 100, and the anode foil 503 of the core package 500 is connected to another rivet 401 of the cover plate 100. The core package 500 is then placed in the storage cavity of the housing assembly 200. By processing the open end of the housing assembly 200 with a girth groove and curling 212, the cover plate 100 and the housing assembly 200 are fixedly connected, forming a storage cavity with two seals, a first sealing structure and a second sealing structure. The core package 500 also includes electrolytic paper 501.

[0093] To utilize the bending deformation of the housing assembly 200, the height of the housing assembly 200 must be greater than the height of the product. Generally, the height of the aluminum shell 210 in the housing assembly 200 needs to be designed to be at least 4.6 mm higher than the product. For example, when designing a product with a height of 40 mm, the height of the aluminum shell 210 needs to be designed to be 44.6 mm. This ensures that the aluminum shell 210 can still accommodate the core package 500 after being waisted and curled 212.

[0094] Through actual testing, the above solution has greatly reduced the probability of electrolyte leakage and significantly improved the sealing performance of the capacitor.

[0095] While the present invention has been described with reference to preferred embodiments, various modifications may be made and equivalent components may be substituted without departing from the scope of the present invention. In particular, the various technical features described in the various embodiments may be combined in any manner, provided no structural conflicts exist. The present invention is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A capacitor, characterized in that: It includes: cover; as well as A shell assembly is formed with a circumferentially extending curled edge and a circumferentially extending first waist groove, the curled edge is bent toward the inner side of the shell assembly and is fastened to one end of the cover plate to form a first sealing structure, and the inner wall of the shell assembly at the first waist groove is pressed against the other end of the cover plate to form a second sealing structure; The first beam waist groove has a first side wall, and the first side wall extends along the axial direction of the housing assembly.

2. The capacitor according to claim 1, wherein The length of the first side wall in the axial direction of the housing assembly is greater than or equal to 2.5 mm.

3. The capacitor according to claim 1 or 2, characterized in that: The depth of the first beam waist groove along the radial direction of the housing assembly is greater than or equal to 1.7 mm.

4. The capacitor according to claim 1 or 2, characterized in that: The cover plate includes a plate body and an adhesive layer arranged on the outer side of the plate body, and the end of the curling edge is embedded in the adhesive layer.

5. The capacitor according to claim 4, wherein The depth of the curling edge embedded in the adhesive layer is greater than or equal to 0.4 mm.

6. The capacitor according to claim 1 or 2, characterized in that: The housing assembly includes an aluminum shell and a heat shrinkable sleeve, wherein the heat shrinkable sleeve is heat-shrinkably wrapped around the aluminum shell. The first beam waist groove is formed by extrusion, and the first beam waist groove is formed on a side of the heat shrinkable sleeve away from the aluminum shell; The aluminum shell is formed with a second beam waist groove corresponding to the first beam waist groove, and the heat shrinkable sleeve is partially embedded in the second beam waist groove.

7. The capacitor according to claim 6, wherein The thickness of the heat shrinkable tube is smaller than the depth of the first beam waist groove.

8. The capacitor according to claim 6, wherein The heat shrinkable sleeve includes a first insulating portion wrapped around the curled edge, wherein the top surface of the first insulating portion is higher than the top surface of the cover plate; The cover plate is riveted to the lead-out terminal by rivets, and the top surface of the rivet is lower than the top surface of the first insulating portion.

9. The capacitor according to claim 1 or 2, characterized in that: A circular chamfer is provided on one side of the cover plate facing the first girth groove, and the inner wall of the shell is fitted with the circular chamfer.

10. The capacitor according to claim 1 or 2, characterized in that: A tapered side surface is provided on a side of the cover plate facing the first beam waist groove, and an inner wall of the shell assembly at the first beam waist groove is fitted to the tapered side surface.

11. The capacitor according to claim 1 or 2, characterized in that: The shell assembly and the cover plate form a receiving cavity, and the core package is received in the receiving cavity.

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