Super capacitor
By integrating the metal cylinder and cover into a single unit and using laser welding technology, the problems of loose connections and insufficient energy density caused by thermal expansion and contraction in supercapacitors have been solved, thus improving stability and energy density.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-10
- Publication Date
- 2026-03-06
AI Technical Summary
Existing supercapacitors are prone to loosening of the positive electrode metal connecting piece under external impact, mechanical fatigue, and ambient temperature changes. This leads to increased contact resistance, increased internal heat, rapid capacity decay, reduced energy storage capacity, and insufficient energy density.
The metal cylinder and metal cap are integrally formed. The positive electrode metal connecting piece is laser-welded to the positive end face of the core. The positive electrode metal column is laser-welded to the connecting piece at the bottom periphery and to the through hole wall of the metal cap. The interference fit is eliminated to ensure the gap between the core and the shell and simplify the manufacturing process.
It avoids loosening of connecting pieces due to thermal expansion and contraction, reduces contact resistance, reduces internal heat increase, extends service life, increases energy density, and simplifies the manufacturing process.
Smart Images
Figure CN223977813U_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to the field of capacitors, and more specifically to a supercapacitor. Background Technology
[0002] Figure 1 This is a cross-sectional schematic diagram of a known supercapacitor.
[0003] exist Figure 1 In the supercapacitor 100', there are metal shell 11', core 12', positive electrode metal connecting piece 13', positive electrode metal pillar 14', negative electrode metal connecting piece 15', negative electrode metal end cap 16', negative electrode metal pillar 17', insulating sheet 18A', sealing ring 18B', and rubber stopper 20'.
[0004] The metal casing 11' has a metal cylinder 111' and a metal cover 112', which are integrally formed with the positive electrode metal column 14' to form a receiving space 113' that is closed at one end along the axial direction D' and open at the other end along the axial direction D'. A constriction ring 114' is formed at the end of the metal casing 11' opposite to that of the metal cover 112'.
[0005] The core 12' is located within the receiving space 113' of the metal shell 11'. The core 12' has positive end 121' and negative end 122' located at opposite ends of the axial direction D', and the core 12' is radially spaced from the metal cylinder 111'.
[0006] The positive electrode metal connector 13' is provided with a plurality of non-through first laser welding grooves 131', which are arranged at intervals along the same circle. The positive electrode metal connector 13' is laser welded to the positive end 121' of the core 12' at the position of the plurality of first laser welding grooves 131'.
[0007] The positive electrode metal connector 13' also has a bent portion 134' arranged around its entire circumference. The bent portion 134' wraps around the circumference of the end of the core 12' corresponding to the positive electrode 121' and is press-fitted with the inner wall of the metal cylinder 111'. In addition, the metal cylinder 111' has a corresponding first bulge 111a' along its entire circumference at the position corresponding to the bent portion 134'. The first bulge 111a' clamps the end of the bent portion 134' between itself and the core 12'.
[0008] The negative electrode metal connector 15' has a metal sheet 151' and a metal flange 152', the metal flange 152' protruding from the periphery of the metal sheet 151' along the axial direction D'. The metal sheet 151' is provided with a plurality of non-through second laser welding grooves 151a', the plurality of second laser welding grooves 151a' are arranged at intervals along the same circle, and the negative electrode metal connector 15' is laser welded to the plane of the negative end 122' of the core 12' at the positions of the plurality of second laser welding grooves 151a'.
[0009] The negative electrode metal end cap 16' and the negative electrode metal pillar 17' are integrally formed single parts. The negative electrode metal end cap 16' has a base plate 163' and an annular protrusion 164'. The annular protrusion 164' protrudes from the periphery of the base plate 163' along the axial direction D'. The annular protrusion 164' is interference-fitted onto the metal flange 152' of the negative electrode metal connecting piece 15' and abuts against the metal sheet 151' of the negative electrode metal connecting piece 15'.
[0010] The base plate 163' of the negative electrode metal end cap 16' and the negative electrode metal post 17' pass through the opening of the constriction ring 114'. An insulating sheet 18A' is provided around the entire circumference between the base plate 163' and the constriction ring 114' of the negative electrode metal end cap 16'. A sealing ring 18B' is provided between the annular protrusion 164' and the metal cylinder 111'. In addition, a corresponding second bulge 111b' is provided around the entire circumference of the metal cylinder 111' at the position corresponding to the sealing ring 18B'. The second bulge 111b' clamps the sealing ring 18B' between itself and the core 12'.
[0011] The substrate 163' of the negative electrode metal end cap 16' is provided with a liquid injection hole. The liquid injection hole is not closed when the electrolyte is injected. The rubber plug 20' is inserted into the liquid injection hole after the electrolyte is injected.
[0012] In supercapacitors, contact internal resistance is one of the components of the equivalent DC internal resistance (ESR) (the others include electrode material internal resistance, electrolyte internal resistance, etc.). ESR represents the power consumed by the internal heating of the supercapacitor and has a significant impact on the charging and discharging process of the supercapacitor. Maintaining a stable ESR value can improve the charging and discharging efficiency and service life of the supercapacitor.
[0013] exist Figure 1In the supercapacitor 100', the bent portion 134' of the positive electrode metal connecting piece 13' is interference-fitted with the inner wall of the metal cylinder 111', and the annular protrusion 164' of the negative electrode metal end cap 16' is interference-fitted along the axial direction D' onto the metal flange 152' of the negative electrode metal connecting piece 15'. During the use of the supercapacitor 100', this interference fit will cause thermal expansion and contraction due to external impact, mechanical fatigue, and changes in ambient temperature. This will lead to loosening between the bent portion 134' of the positive electrode metal connecting piece 13' and the inner wall of the metal cylinder 111', and between the annular protrusion 164' of the negative electrode metal end cap 16' and the metal flange 152' of the negative electrode metal connecting piece 15', resulting in a large contact resistance. The internal heat of the supercapacitor 100' increases sharply, the capacity decays rapidly, the energy storage capacity decreases sharply, and the service life of the supercapacitor 100' is shortened.
[0014] In addition, Figure 1 In the supercapacitor 100', since the end of the bent portion 134' of the positive electrode metal connecting piece 13' is located between the circumferential surfaces of the metal cylinder 111' and the core 12', this occupies the space between the circumferential surfaces of the metal cylinder 111' and the core 12', reducing the space occupancy rate of the core 12' in the housing space 113', which is not conducive to improving the energy density of the supercapacitor 100'. Similarly, the arrangement of the sealing ring 18B' and the insulating sheet 18A' is not conducive to improving the energy density of the supercapacitor 100'.
[0015] In addition, the arrangement of the first bulge 111a' and the second bulge 111b' brings the metal cylinder 111' closer to the circumferential surface of the core 12', increasing the risk that the first bulge 111a' and the second bulge 111b' will come into contact with and damage the circumferential surface of the core 12'. Utility Model Content
[0016] In view of the problems existing in the background art, one object of this disclosure is to provide a supercapacitor that can avoid the loosening of the positive electrode metal connecting piece of the supercapacitor due to thermal expansion and contraction caused by external impact, mechanical fatigue and changes in ambient temperature during the use of the supercapacitor, and avoid the generation of large contact internal resistance.
[0017] Another object of this disclosure is to provide a supercapacitor that reduces the risk of damage to the periphery of the core from contact with the metal casing.
[0018] Another object of this disclosure is to provide a supercapacitor that can help improve the energy density of the supercapacitor.
[0019] Therefore, a supercapacitor is provided, comprising a metal casing, a core, a positive electrode metal connector, and a positive electrode metal post; the metal casing has a metal cylinder and a metal cap, which are integrally formed to form a receiving space that is closed at one end along the axial direction and open at the other end along the axial direction, and the metal cap has a through hole that extends along the axial direction; the core is located within the receiving space of the metal casing, and the core has a positive terminal and a negative terminal located at opposite ends along the axial direction, the positive terminal being close to the through hole of the metal cap along the axial direction, and the core being radially spaced from the metal cylinder; the positive electrode metal connector is laser-welded to the positive terminal plane of the core along the axial direction, and the projection of the positive electrode metal connector along the axial direction falls within the projection range of the circumferential surface of the core; the positive electrode metal post is laser-welded to the positive electrode metal connector at the bottom periphery, the positive electrode metal post passes through the through hole of the metal cap along the axial direction, and a portion of the circumferential surface of the positive electrode metal post is laser-welded to the wall of the metal cap forming the through hole.
[0020] The beneficial effects of this disclosure are as follows.
[0021] In the supercapacitor according to this disclosure, the metal cylinder and metal cover are integrally formed; the positive electrode metal connecting piece is laser-welded axially to the positive end plane of the core; the positive electrode metal column is laser-welded to the positive electrode metal connecting piece at the periphery of the bottom; and a portion of the peripheral surface of the positive electrode metal column is laser-welded to the wall of the metal cover forming a through hole. There is no... Figure 1 The interference fit of the supercapacitor prevents the positive electrode metal connection from loosening due to thermal expansion and contraction caused by external impacts, mechanical fatigue, and changes in ambient temperature during the use of the supercapacitor. This avoids situations such as large contact resistance, rapid increase in internal heat, rapid capacity decay, sharp decrease in energy storage capacity, and shortened service life of the supercapacitor.
[0022] In the supercapacitor according to this disclosure, the first bulge is eliminated by integrally forming the metal cylinder and metal cover, laser welding the positive electrode metal connecting piece axially to the positive end plane of the core, laser welding the positive electrode metal pillar to the positive electrode metal connecting piece at the bottom periphery, and laser welding a portion of the peripheral surface of the positive electrode metal pillar to the wall of the metal cover forming a through hole. This ensures a gap between the peripheral surface of the core and the metal shell, reducing the risk of the metal shell contacting and damaging the peripheral surface of the core 12. Furthermore, the manufacturing process is simplified.
[0023] In the supercapacitor according to this disclosure, the projection of the positive electrode metal connector in the axial direction falls within the projection range of the circumferential surface of the core, which means that the positive electrode metal connector will not extend beyond the circumferential surface of the core in the radial direction. This avoids the positive electrode metal connector occupying the space between the circumferential surface of the core and the metal shell, ensuring the space occupancy rate of the core in the containment space, and is conducive to improving the energy density of the supercapacitor. Attached Figure Description
[0024] Figure 1 This is a cross-sectional schematic diagram of a known supercapacitor.
[0025] Figure 2 This is a top perspective view of the supercapacitor according to this disclosure.
[0026] Figure 3 This is a bottom-view perspective view of the supercapacitor according to this disclosure.
[0027] Figure 4 This is a top view of the supercapacitor according to this disclosure.
[0028] Figure 5 It is along Figure 4 A sectional view drawn along line AA.
[0029] Figure 6 This is a top-view exploded perspective view of the supercapacitor according to this disclosure.
[0030] Figure 7 This is a bottom-view exploded perspective view of the supercapacitor according to this disclosure.
[0031] The reference numerals in the attached figures are explained as follows:
[0032] 100' Supercapacitor 131 First Laser Welding Groove
[0033] D'Axial 132 Recess
[0034] 11' Metal casing 133 First opening
[0035] 111' Metal cylinder 14 Positive electrode metal column
[0036] 111a' First Drum 141 Column
[0037] 111b' Second Drum 142 First Step
[0038] 112' Metal cover 143 Second step
[0039] 113' Containment Space 143a First End Face
[0040] 114' shrink ring 143b second end face
[0041] 12' core, 15 negative electrode metal connector
[0042] 121' positive end 151 metal sheet
[0043] 122' Negative End 151a Second Laser Welding Groove
[0044] 13' Positive electrode metal connector 151b second opening
[0045] 131' First laser welding groove 152 Metal flange
[0046] 134' Bend Section 153 Accommodation Space
[0047] 14' positive metal post, 16' negative metal end cap
[0048] 15' Negative electrode metal connector 161 First metal plate
[0049] 151' metal sheet 161a base
[0050] 151a' Second laser welding groove 161b Protrusion
[0051] 152' metal flange 161c through hole
[0052] 16' Negative Electrode Metal End Cap 161d Recess
[0053] 163' substrate 161e third hole
[0054] 164' ring protrusion 162 second metal plate
[0055] 17' Negative Electrode Metal Pillar 162a Opening
[0056] 18A' Insulating Sheet 162b Step
[0057] 18B' sealing ring S1 annular plane
[0058] 20' Rubber Stopper S2 Cylindrical Circumference
[0059] 100 supercapacitor 162c negative sign
[0060] The first hole in the D-axis 162d
[0061] 11 Metal casing 162e Second hole
[0062] 111 Metal cylinder 17 Negative electrode metal column
[0063] 112 metal cover, 18 insulating sheets
[0064] 112a through hole, 181 perforation
[0065] 112b positive mark 182 base ring
[0066] 113 Containment Space 182a Fourth Hole
[0067] 12-core 183-ring
[0068] 121 positive extreme 19 metal nails
[0069] 122 negative extremes 191 films
[0070] 123 Positive Electrode 191a Inner Surface
[0071] 124 negative electrode plate with 192 protrusions
[0072] 125 release paper 20 rubber stopper
[0073] 13 Positive electrode metal connector W laser welding fusion area Detailed Implementation
[0074] The accompanying drawings illustrate embodiments of this disclosure, and it will be understood that the disclosed embodiments are merely examples of this disclosure, which can be implemented in various forms. Therefore, the specific details disclosed herein should not be construed as limiting, but are intended only as the basis for the claims and as an illustrative basis to teach those skilled in the art how to implement this disclosure in various ways.
[0075] In this disclosure, unless otherwise stated, the terms “first,” “second,” “third,” “fourth,” etc., are used for illustrative and component identification purposes only and should not be construed as indicating relative importance or interrelationship.
[0076] Reference Figures 2 to 7 The supercapacitor 100 according to this disclosure includes a metal casing 11, a core 12, a positive electrode metal connector 13, and a positive electrode metal post 14.
[0077] The metal casing 11 has a metal cylinder 111 and a metal cover 112, which are integrally formed to create a receiving space 113 that is closed at one end along the axial direction D and open at the other end. The metal cover 112 has a through hole 112a extending along the axial direction D. The core 12 is located within the receiving space 113 of the metal casing 11. The core 12 has a positive terminal 121 and a negative terminal 122 located at opposite ends along the axial direction D. The positive terminal 121 is close to the through hole 112a of the metal cover 112 along the axial direction D. The core 12 is radially spaced from the metal cylinder 111. The positive electrode metal connecting piece 13 is laser-welded to the plane of the positive terminal 121 of the core 12 along the axial direction D (i.e., forming a laser-welded fusion structure). The projection of the positive electrode metal connecting piece 13 along the axial direction D falls within the projection range of the circumferential surface of the core 12. The positive electrode metal post 14 is laser-welded to the positive electrode metal connecting piece 122 at its bottom periphery (i.e., forming a laser-welded fusion structure). The positive electrode metal post 14 passes through the through hole 112a of the metal cover 112 along the axial direction D, and a portion of the peripheral surface of the positive electrode metal post 14 is laser-welded to the wall of the metal cover 112 forming the through hole 112a (i.e., forming a laser-welded fusion structure). Wherein, in Figure 5For clarity, the laser welding fusion part W corresponding to the use of laser welding is given, and the laser welding forms a laser welding fusion structure.
[0078] In the supercapacitor 100 according to this disclosure, the metal cylinder 111 and the metal cover 112 are integrally formed; the positive electrode metal connecting piece 13 is laser-welded along the axial direction D to the plane of the positive terminal 121 of the core 12; the positive electrode metal pillar 14 is laser-welded to the positive electrode metal connecting piece 122 at the periphery of the bottom; and a portion of the peripheral surface of the positive electrode metal pillar 14 is laser-welded to the wall of the metal cover 112 forming the through hole 112a. There is no... Figure 1 The interference fit of the supercapacitor 100' prevents the positive electrode metal connection piece 13 of the supercapacitor 100 from loosening due to thermal expansion and contraction caused by external impact, mechanical fatigue, and changes in ambient temperature during the use of the supercapacitor 100. This avoids situations such as large contact resistance, rapid increase in internal heat of the supercapacitor 100, rapid capacity decay, sharp decrease in energy storage capacity, and shortened service life of the supercapacitor 100.
[0079] In the supercapacitor 100 according to this disclosure, the metal cylinder 111 and the metal cover 112 are integrally formed; the positive electrode metal connecting piece 13 is laser-welded along the axial direction D to the plane of the positive terminal 121 of the core 12; the positive electrode metal pillar 14 is laser-welded to the positive electrode metal connecting piece 122 at the bottom periphery; and a portion of the peripheral surface of the positive electrode metal pillar 14 is laser-welded to the wall of the metal cover 112 forming the through hole 112a. This eliminates the need for a first bulge 111a', ensuring a gap between the peripheral surface of the core 12 and the metal shell 11, and reducing the risk of the metal shell 11 contacting and damaging the peripheral surface of the core 12. Furthermore, the manufacturing process is simplified.
[0080] In the supercapacitor 100 according to this disclosure, the projection of the positive electrode metal connector 13 in the axial direction D falls within the projection range of the circumferential surface of the core 12, which means that the positive electrode metal connector 13 will not extend beyond the circumferential surface of the core 12 in the radial direction. This avoids the positive electrode metal connector 13 occupying the space between the circumferential surface of the core 12 and the metal shell 11, ensuring the space occupancy rate of the core 12 in the housing space 113, which is beneficial to improving the energy density of the supercapacitor 100.
[0081] For example, the metal casing 11, the positive electrode metal connecting piece 13, and the positive electrode metal post 14 are all made of aluminum, steel, or copper. (Refer to...) Figure 2 , Figure 5 and Figure 6 In one example, the metal cover 112 of the metal casing 11 is formed with a positive mark 112b. For example... Figures 2 to 7 As shown, in one example, the metal cylinder 111 is a straight cylinder.
[0082] like Figure 6 and Figure 7 As shown, the core 12 includes a positive electrode 123, a negative electrode 124, and a separating paper 125 that spaces the positive electrode 123 and the negative electrode 124 apart. The positive electrode 123 protrudes at one end relative to the positive electrode 124 along the axial direction D to form a positive terminal 121 at that end of the core 12 along the axial direction D. The negative electrode 124 protrudes at the other end relative to the negative electrode 124 along the axial direction D to form a negative terminal 122 at the other end of the core 12 along the axial direction D. In an alternative example not shown, the positive terminal 121 is formed by cutting the positive electrode 123, and similarly, the negative terminal 122 can be formed by cutting the negative electrode 124. The positive terminal 121 and the negative terminal 122 can be either all-tab or multi-tab.
[0083] like Figure 6 and Figure 7 The following is also referenced Figure 5 In one example, the positive electrode metal connector 13 is provided with a plurality of non-through first laser welding grooves 131, which are arranged at intervals along the same circle. The positive electrode metal connector 13 is laser welded to the positive end 121 plane of the core 12 at the positions of the plurality of first laser welding grooves 131 (i.e., to form a laser welding fusion structure).
[0084] like Figure 6 and Figure 7 The following is also referenced Figure 5 In one example, the positive electrode metal connector 13 has a non-through recess 132 located at the center of the positive electrode metal connector 13; the positive electrode metal post 14 has a post body 141, a first step portion 142, and a second step portion 143. The post body 141 passes through the through hole 112a of the metal cover 112 and is partially exposed outside the metal cover 112; the first step portion 142 is located radially outside the post body 141 and is located in the through hole 112a of the metal cover 112. The circumferential surface of the first step portion 142 is flush with the metal cover 112. The wall of the forming through hole 112a of the cover 112 is laser welded (i.e., a laser welded fusion structure is formed), and the end face of the first step portion 142 in the axial direction D is exposed outward along the axial direction D; the second step portion 143 is located radially outside the second step portion 143. The second step portion 143 is located outside the through hole 112a of the metal cover 112 and in the recess 132 of the positive electrode metal connecting piece 13. The peripheral surface of the second step portion 143 is laser welded to the peripheral wall of the forming recess 132 of the positive electrode metal connecting piece 13 (i.e., a laser welded fusion structure is formed).
[0085] like Figure 5 As shown, in one example, the first end face 143a and the second end face 143b opposite to the axial direction D of the second step portion 143 abut against the bottom wall of the forming recess 132 of the metal cover 112 and the positive electrode metal connecting piece 13, respectively.
[0086] like Figure 6 and Figure 7 As shown, the positive electrode metal connector 13 has a plurality of through first openings 133, which are arranged alternately with a plurality of first laser welding grooves 131 along the same circle. The plurality of first openings 133 can be used as holes for electrolyte penetration and positioning holes.
[0087] Reference Figures 2 to 7 In one example, the supercapacitor 100 further includes a negative electrode metal connector 15, a negative electrode metal end cap 16, a negative electrode metal post 17, and an insulating sheet 18. The negative electrode metal connector 15 has a metal sheet 151 and a metal flange 152, the metal flange 152 protruding from the periphery of the metal sheet 151 along the axial direction D, the metal flange 152 forming an accommodating space 153, and the metal sheet 151 of the negative electrode metal connector 15 is laser-welded along the axial direction D to the negative terminal 122 of the core 12 (i.e., forming a laser-welded fusion structure). The negative electrode metal end cap 16 has a first metal plate 161 and a second metal plate 162. The first metal plate 161 is at least partially accommodated within a receiving space 153 formed by the metal flange 152 of the negative electrode metal connecting piece 15. The surface of the first metal plate 161 adjacent to the portion accommodated within the receiving space 153 is laser-welded to the bottom surface of the metal flange 152 in the axial direction D (i.e., forming a laser-welded fusion structure). The second metal plate 162 has an opening 162a extending along the axial direction D. The periphery of the second metal plate 162 is laser-welded to the metal housing 11 at the opening of the receiving space 113 of the metal housing 11 (i.e., forming a laser-welded fusion structure). An insulating sheet 18 is located between the first metal plate 161 and the second metal plate 162 along the axial direction D. The insulating sheet 18 has a through hole 181 extending along the axial direction D. The negative electrode metal post 17 is laser-welded to the first metal plate 161 at its bottom periphery (i.e., forming a laser-welded fusion structure). The negative electrode metal post 17 passes through the through hole 181 of the insulating sheet 18 and the opening 162a of the second metal plate 162 along the axial direction D. The insulating sheet 18 insulatingly separates the first metal plate 161 and the second metal plate 162 along the axial direction D, and radially insulatingly and sealingly separates the negative electrode metal post 17 from the second metal plate 162 at the opening 162a of the second metal plate 162. Similarly, in Figure 5 The laser welding fusion region W corresponding to the above laser welding is given in the figure.
[0088] In this example, the surface of the first metal plate 161 adjacent to the portion accommodated within the accommodating space 153 is laser-welded to the bottom surface of the metal flange 152 in the axial direction D. Figure 1Compared to the interference fit of the supercapacitor 100', this avoids the phenomenon of thermal expansion and contraction caused by external impacts, mechanical fatigue, and changes in ambient temperature during the use of the supercapacitor 100, which could lead to loosening between the first metal plate 161 of the supercapacitor 100 and the metal flange 152 of the negative electrode metal connecting piece 15. This also avoids situations such as large contact resistance, a sharp increase in internal heat of the supercapacitor 100, rapid capacity decay, a sharp decrease in energy storage capacity, and a shortened service life of the supercapacitor 100.
[0089] In this example, with Figure 1 Compared to the arrangement of the sealing ring 18B' and the insulating sheet 18A' in the supercapacitor 100', the insulating sheet 18 does not extend into the space between the peripheral surface of the core 12 and the metal shell 11, which can improve the energy density of the supercapacitor 100.
[0090] In this example, the negative electrode metal connector 15, negative electrode metal end cap 16, negative electrode metal post 17, and insulating sheet 18 are arranged to eliminate the need for [other components]. Figure 1 The second bulge 111b' ensures a proper gap between the peripheral surface of the core 12 and the metal housing 11, reducing the risk of the metal housing 11 contacting and damaging the peripheral surface of the core 12. Furthermore, it simplifies the manufacturing process.
[0091] For example, the negative electrode metal connecting piece 15, the negative electrode metal end cap 16, and the negative electrode metal post 17 are all metal parts made of the same material as the metal shell 11.
[0092] Similarly, as Figure 7 As shown and referenced Figure 5 In one example, the metal sheet 151 of the negative electrode metal connector 15 is provided with a plurality of non-through second laser welding grooves 151a. The plurality of second laser welding grooves 151a are arranged at intervals along the same circle. The negative electrode metal connector 15 is laser welded to the plane of the negative end 122 of the core 12 at the positions of the plurality of second laser welding grooves 151a (i.e., to form a laser welding fusion structure).
[0093] like Figure 6 and Figure 7 As shown and referenced Figure 5 In one example, the metal sheet 151 of the negative electrode metal connector 15 is provided with a plurality of through second openings 151b, which are arranged alternately with a plurality of second laser welding grooves 151a along the same circle. The plurality of second openings 151b can be used as holes for electrolyte penetration and positioning holes.
[0094] like Figure 6 As shown and referenced Figure 5In one example, the first metal plate 161 has a base 161a and a protrusion 161b protruding from the base 161a toward the core 12 along the axial direction D. The protrusion 161b is accommodated in a receiving space 153 enclosed by the metal flange 152 of the negative electrode metal connecting piece 15, and the surface of the base 161a adjacent to the peripheral surface of the protrusion 161b is laser welded to the bottom surface of the metal flange 152 of the negative electrode metal connecting piece 15 along the axial direction D (i.e., to form a laser welded fusion structure).
[0095] like Figure 6 and Figure 7 As shown and referenced Figure 5 In one example, the first metal plate 161 also has a plurality of through holes 161c spaced around the entire circumference and extending axially through the base 161a and the protrusion 161b along the axial direction D. Similarly, the plurality of through holes 161c can be used as holes for permeating electrolyte and as positioning holes.
[0096] like Figure 6 As shown, in one example, the first metal plate 161 further has a centrally located recess 161d that is axially spaced from the base 161a and corresponds to the negative electrode metal post 17; the surface of the first metal plate 161 on the side opposite to the recess 161d is a single plane, and the negative electrode metal post 17 is laser-welded to this single plane at the periphery of the bottom (i.e., forming a laser-welded fusion structure). The recess 161d helps to reduce the weight of the first metal plate 161.
[0097] like Figure 6 and Figure 7 As shown and referenced Figure 5 In one example, the metal cylinder 111 is a straight cylinder; the second metal plate 162 has a step 162b, which has an annular plane S1 and a cylindrical circumferential surface S2. The annular plane S1 abuts against the end face of the metal cylinder 111 along the axial direction D. The annular plane S1 is laser welded to the end face of the metal cylinder 111 along the axial direction D (i.e., forming a laser welded fusion structure). The cylindrical circumferential surface S2 is radially spaced from the metal cylinder 111.
[0098] Similarly, Figure 3 and Figure 7 As shown, in one example, the second metal plate 162 is formed with a negative sign 162c.
[0099] like Figures 5 to 7 As shown, the negative electrode metal column 17 is, for example, but not limited to, a cylinder of equal diameter.
[0100] like Figure 6 and Figure 7 And refer to Figure 5In one example, the insulating sheet 18 has a base ring 182 and a protruding ring 183. The base ring 182 insulatingly separates the first metal plate 161 and the second metal plate 162 along the axial direction D. The protruding ring 183 protrudes from the inner wall surface of the base ring 182 along the axial direction D and radially insulatingly and sealingly separates the negative electrode metal post 17 from the second metal plate 162 at the opening 162a of the second metal plate 162.
[0101] Reference Figure 3 and Figures 5 to 7 In one example, the supercapacitor 100 also includes a metal pin 19 and a rubber stopper 20. A second metal plate 162 has a first hole 162d and a second hole 162e, and a first metal plate 161 has a third hole 161e. The first hole 162d, the second hole 162e, and the third hole 161e are aligned along the axial direction D, and the diameter of the second hole 162e is smaller than the diameter of the first hole 162d. An insulating sheet 18 has a base ring 182, which has a fourth hole 182a. The fourth hole 182a, the third hole 161e, the second hole 162e, and the first hole 162d are aligned along the axial direction D. The fourth hole 182a, the third hole 161e, the second hole 162e, and the first hole 162d are used to inject electrolyte before they are sealed by the rubber stopper 20 and the metal pin 19. After the electrolyte injection is completed, the rubber stopper 20 is inserted into the second hole 162e of the first metal plate 161 to seal the second hole 162e of the first metal plate 161. After the electrolyte injection is completed, the metal nail 19 is placed in the first hole 162d of the second metal plate 162 and laser-welded to the second metal plate 162 at the adjacent outer periphery (i.e., forming a laser-welded fusion structure). The installation of the metal nail 19 enhances the sealing performance based on the rubber stopper 20.
[0102] The above detailed description describes several exemplary embodiments, but this document is not intended to limit itself to the explicitly disclosed combinations. Therefore, unless otherwise stated, the various features disclosed herein can be combined to form several other combinations, which are not shown for simplicity.
Claims
1. A supercapacitor, characterized in that, the supercapacitor (100) comprises a metal shell (11), a core (12), a positive metal connecting tab (13), and a positive metal post (14); the metal shell (11) has a metal cylinder (111) and a metal cover (112), the metal cylinder (111) and the metal cover (112) are integrally formed to form a receiving space (113) which is closed at one end along an axial direction (D) and open at the other end along the axial direction (D), and the metal cover (112) has a through hole (112a) penetrating along the axial direction (D); the core (12) is located in the receiving space (113) of the metal shell (11), the core (12) has a positive end (121) and a negative end (122) located at opposite ends along the axial direction (D) respectively, the positive end (121) is close to the through hole (112a) of the metal cover (112) along the axial direction (D), and the core (12) is spaced apart from the metal cylinder (111) along a radial direction; the positive metal connecting tab (13) is plane laser welded to the positive end (121) of the core (12) along the axial direction (D), and a projection of the positive metal connecting tab (13) along the axial direction (D) falls within a projection range of a peripheral surface of the core (12); the positive metal post (14) is laser welded to the positive metal connecting tab (13) at a peripheral edge of a bottom portion, the positive metal post (14) penetrates through the through hole (112a) of the metal cover (112) along the axial direction (D), and a part of a peripheral surface of the positive metal post (14) is laser welded to a wall of the metal cover (112) forming the through hole (112a).
2. The supercapacitor according to claim 1, characterized in that, the metal cylinder (111) is a straight cylinder.
3. The supercapacitor according to claim 1, characterized in that, the positive metal connecting tab (13) is provided with a plurality of first laser welding grooves (131) which are not penetrated, the plurality of first laser welding grooves (131) are arranged at intervals along the same circle, and the positive metal connecting tab (13) is plane laser welded to the positive end (121) of the core (12) at positions of the plurality of first laser welding grooves (131).
4. The supercapacitor according to claim 1, characterized in that, the positive metal connecting tab (13) has a non-penetrating recess (132) located at a center of the positive metal connecting tab (13); the positive metal post (14) has a post body (141), a first stepped portion (142), and a second stepped portion (143), the post body (141) penetrates through the through hole (112a) of the metal cover (112) and is partially exposed outside the metal cover (112); the first stepped portion (142) is located radially outside the post body (141), the first stepped portion (142) is located in the through hole (112a) of the metal cover (112), a peripheral surface of the first stepped portion (142) is laser welded to the wall of the metal cover (112) forming the through hole (112a), and an end surface of the first stepped portion (142) along the axial direction (D) is exposed outward along the axial direction (D); The second step portion (143) is radially located outside the second step portion (143), is located outside the through hole (112a) of the metal cover (112) and in the recess (132) of the positive metal connecting piece (13), and the peripheral surface of the second step portion (143) is laser welded with the peripheral wall of the positive metal connecting piece (13) forming the recess (132).
5. The supercapacitor of claim 1, wherein, The supercapacitor (100) further comprises a negative metal connecting piece (15), a negative metal end cover (16), a negative metal post (17), and an insulating sheet (18), The negative metal connecting piece (15) has a metal sheet (151) and a metal flange (152) protruding from the periphery of the metal sheet (151) in the axial direction (D), the metal flange (152) surrounds a receiving space (153), and the metal sheet (151) of the negative metal connecting piece (15) is laser welded in the axial direction (D) with the negative end (122) of the core (12); The negative metal end cover (16) has a first metal plate (161) and a second metal plate (162), the first metal plate (161) is at least partially accommodated in the receiving space (153) surrounded by the metal flange (152) of the negative metal connecting piece (15), and the surface of the first metal plate (161) adjacent to the portion accommodated in the receiving space (153) is laser welded in the axial direction (D) with the bottom surface of the metal flange (152), the second metal plate (162) has an opening (162a) penetrating in the axial direction (D), and the periphery of the second metal plate (162) is laser welded with the metal shell (11) at the opening of the receiving space (113) of the metal shell (11); The insulating sheet (18) is located between the first metal plate (161) and the second metal plate (162) in the axial direction (D), and the insulating sheet (18) has a through hole (181) penetrating in the axial direction (D); The negative metal post (17) is laser welded with the first metal plate (161) at the periphery of the bottom, and the negative metal post (17) penetrates through the through hole (181) of the insulating sheet (18) and the opening (162a) of the second metal plate (162) in the axial direction (D); The insulating sheet (18) insulates and separates the first metal plate (161) and the second metal plate (162) in the axial direction (D), and the insulating sheet (18) insulates and seals the negative metal post (17) and the second metal plate (162) radially at the opening (162a) of the second metal plate (162).
6. The supercapacitor of claim 5, wherein, The metal sheet (151) of the negative metal connecting piece (15) is provided with a plurality of second laser welding grooves (151a) that are not penetrated, and the plurality of second laser welding grooves (151a) are arranged at intervals along the same circle, and the negative metal connecting piece (15) is laser welded in the plane with the negative end (122) of the core (12) at the positions of the plurality of second laser welding grooves (151a).
7. The supercapacitor of claim 5, wherein, The first metal plate (161) has a base portion (161a) and a protruding portion (161b) protruding from the base portion (161a) toward the core (12) along the axial direction (D), The protruding portion (161b) is accommodated in an accommodation space (153) surrounded by the metal flange (152) of the negative metal connecting piece (15), and a surface of the base portion (161a) adjacent to a peripheral surface of the protruding portion (161b) is laser-welded to a bottom surface of the metal flange (152) of the negative metal connecting piece (15) along the axial direction (D).
8. The super capacitor of claim 5, wherein The first metal plate (161) has a recessed portion (161d) in the center and spaced from the base portion (161a) along the axial direction (D) and corresponding to the negative metal post (17); A surface of the first metal plate (161) on the side opposite to the recessed portion (161d) is an integral plane, and the negative metal post (17) is laser-welded to the integral plane at the bottom peripheral edge.
9. The super capacitor of claim 5, wherein The metal cylinder (111) is a straight cylinder; The second metal plate (162) is formed with a step (162b) having an annular plane (S1) and a cylindrical peripheral surface (S2), the annular plane (S1) abutting against and laser-welded to an axial direction (D) end surface of the metal cylinder (111), and the cylindrical peripheral surface (S2) being spaced from the metal cylinder (111) along the radial direction.
10. The super capacitor of claim 5, wherein The insulating sheet (18) has a base ring (182) and a protruding ring (183), The base ring (182) insulates and separates the first metal plate (161) and the second metal plate (162) along the axial direction (D), The protruding ring (183) protrudes from an inner wall surface of the base ring (182) along the axial direction (D) and insulates and seals the negative metal post (17) from the second metal plate (162) along the radial direction at the opening (162a) of the second metal plate (162).
11. The super capacitor of claim 5, wherein The super capacitor (100) further comprises a metal nail (19) and a rubber plug (20); The second metal plate (162) is provided with a first hole (162d) and a second hole (162e), and the first metal plate (161) is provided with a third hole (161e), the first hole (162d), the second hole (162e), and the third hole (161e) being aligned along the axial direction (D), and the second hole (162e) having a smaller hole diameter than the first hole (162d); The insulating sheet (18) has a base ring (182) provided with a fourth hole (182a), and the fourth hole (182a), the third hole (161e), the second hole (162e), and the first hole (162d) are aligned along the axial direction (D); The fourth hole (182a), the third hole (161e), the second hole (162e), and the first hole (162d) are used for injecting electrolyte before being closed by the rubber plug (20) and the metal nail (19). A rubber plug (20) is inserted into the second hole (162e) of the first metal plate (161) to seal the second hole (162e) of the first metal plate (161) after the electrolyte injection is completed; A metal nail (19) is placed in the first hole (162d) of the second metal plate (162) and laser-welded to the second metal plate (162) at the circumferential edge of the adjacent outer portion after the electrolyte injection is completed.
12. The supercapacitor of claim 11, wherein The metal nail (19) has a plate portion (191) and a protruding portion (192) which protrudes from the plate portion (191) in the axial direction (D), The plate portion (191) is abutted against the bottom wall of the first metal plate (161) which forms between the first hole (162d) and the second hole (162e), the circumferential surface of the plate portion (191) is laser-welded to the circumferential wall of the first metal plate (161) which forms the first hole (162d), and the inner surface (191a) of the plate portion (191) is in abutment with the bottom wall of the first metal plate (161) which forms between the first hole (162d) and the second hole (162e); The protruding portion (192) is inserted into the second hole (162e) of the first metal plate (161).