CN213935970U

CN213935970U - Super capacitor

Info

Publication number: CN213935970U
Application number: CN202023173140.9U
Authority: CN
Inventors: 陈宇澄; 陈宗元; 潘素清
Original assignee: Fuhuade Electronics Dongguan Co ltd
Current assignee: Fuhuade Electronics Dongguan Co ltd
Priority date: 2020-12-24
Filing date: 2020-12-24
Publication date: 2021-08-10
Anticipated expiration: 2030-12-24

Abstract

The present disclosure provides a supercapacitor including a housing, a roll core, a positive connection tab, a negative connection tab, and a cover plate. An opening is formed in one axial side of the shell, the winding core, the positive connecting sheet and the negative connecting sheet are accommodated in the shell, and two axial ends of the winding core are respectively connected to the positive connecting sheet and the negative connecting sheet; the apron sets up in the open-ended one side of shell and seals the opening, and the lower extreme of apron is equipped with the stair structure, and the stair structure includes that first global and second are global, and the diameter that first global is greater than the global diameter of second, and the negative connection piece supports along the axial and leans on in the lower extreme of apron and at second peripheral and apron welded connection. In the ultracapacitor system according to this disclosure, the stair structure can backstop the welding slag and splash to first global, prevents that the welding slag from attaching to first global and forming unevenness's arch, has played the guard action to first global from this, has improved the sealing performance between apron and the shell.

Description

Super capacitor

Technical Field

The present disclosure relates to the field of capacitors, and more particularly, to a super capacitor.

Background

The super capacitor is also called double electric layer capacitor, and is a novel energy storage device. The negative connecting piece and the cover plate of the super capacitor are connected through laser welding, aluminum slag can splash to the side surface of the cover plate to form welding slag when the joint of the negative connecting piece and the cover plate is welded, and when the sealing ring is clamped between the side surface of the cover plate and the inner wall of the shell to seal, the welding slag is attached to the side surface to influence the sealing between the cover plate and the shell, so that the risk of leakage of the capacitor is caused.

SUMMERY OF THE UTILITY MODEL

In view of the problems in the background art, an object of the present disclosure is to provide a supercapacitor, which can prevent formation of welding slag at a position of a cover plate corresponding to a seal ring, and improve the sealing performance of the supercapacitor.

In order to achieve the purpose, the disclosure provides a super capacitor, which comprises a shell, a winding core, a positive connecting sheet, a negative connecting sheet and a cover plate, wherein an opening is formed in one axial side of the shell, the winding core, the positive connecting sheet and the negative connecting sheet are accommodated in the shell, and two axial ends of the winding core are respectively connected to the positive connecting sheet and the negative connecting sheet; the cover plate is arranged on one side of the opening of the shell and seals the opening, a stepped structure is arranged at the lower end of the cover plate and comprises a first circumferential surface and a second circumferential surface, the diameter of the first circumferential surface is larger than that of the second circumferential surface, and the negative connecting sheet is axially abutted against the lower end of the cover plate and is welded with the cover plate at the second circumferential surface.

In one embodiment, the end surface of the negative connecting piece extends beyond the second circumferential surface along the circumferential direction.

In one embodiment, the negative connecting piece is provided with a convex ring protruding towards the cover plate, and the outer peripheral surface of the convex ring is in contact with the inner side surface of the lower end of the cover plate.

In one embodiment, the negative connecting sheet is provided with a plurality of first welding areas and a plurality of first fixing holes, and the first welding areas and the first fixing holes are alternately arranged along the circumferential direction of the negative connecting sheet.

In an embodiment, the negative connecting piece further includes a plurality of first through grooves, and each of the first through grooves corresponds to one of the first fixing holes and is communicated with the first fixing hole.

In one embodiment, the positive connecting piece is arranged on one side of the shell far away from the opening and is in interference fit with the inner wall of the shell.

In one embodiment, the positive connection piece includes a bent portion extending in the axial direction, and the bent portion is connected to the housing via ultrasonic welding.

In one embodiment, the housing is further provided with a first protrusion protruding radially inward, at least a portion of the first protrusion being in contact with the bent portion of the positive connection piece.

In one embodiment, the positive connecting sheet is provided with a plurality of second welding areas and a plurality of second fixing holes, and the second welding areas and the second fixing holes are alternately arranged along the circumferential direction of the positive connecting sheet; the positive connecting piece further comprises a plurality of second through grooves, and each second through groove corresponds to one second fixing hole and is communicated with the second fixing hole.

In an embodiment, the supercapacitor further includes a sealing ring and an insulating ring, the sealing ring is sandwiched between the first circumferential surface and the inner wall of the housing, one end of the insulating ring is disposed adjacent to the sealing ring and extends beyond the open end of the housing, and the insulating ring separates the housing from the cover plate; the housing is provided with the second projection projecting radially inward, at least a part of the second projection being in contact with the seal ring.

The beneficial effect of this disclosure: in the ultracapacitor system according to this disclosure, the diameter of first global is greater than the global diameter of second for the lower extreme of apron forms stair structure, in the lower extreme with the apron and the negative connection piece welding process, the welding position is located the lower extreme of the global of second and the junction of negative connection piece, stair structure can backstop welding slag and splash to first global, prevent that the welding slag from attaching to first global and forming unevenness's arch, has played the guard action to first global from this, has improved the sealing performance between apron and the shell.

Drawings

Fig. 1 is a cross-sectional view of an ultracapacitor according to the present disclosure.

Fig. 2 is a partially enlarged view of a portion of fig. 1.

Fig. 3 is a partially enlarged view of another portion of fig. 1.

Fig. 4 is a partially enlarged view of fig. 2.

Fig. 5 is an enlarged view of the negative connecting tab of fig. 1.

Fig. 6 is an enlarged view of the positive connector tab of fig. 1.

Wherein the reference numerals are as follows:

1 first welding zone of the outer shell 43

11 opening 44 first fixing hole

12 first protrusion 45 first through groove

13 second projection 5 cover plate

2 roll core 51 ladder structure

3 first peripheral surface of positive connecting sheet 511

31 a bent part 512 second peripheral surface

32 second weld zone 52 inboard

33 second fixing hole 53 pour hole

34 second through groove 6 sealing ring

4 negative connecting sheet 7 insulating ring

41 end face 8 metal plug

42 convex ring 9 sealing plug

421 peripheral surface

Detailed Description

The accompanying drawings illustrate embodiments of the present disclosure and it is to be understood that the disclosed embodiments are merely examples of the disclosure, which can be embodied in various forms, and therefore, specific details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present disclosure.

As shown in fig. 1, the supercapacitor according to the present disclosure includes a can 1, a winding core 2, a positive connection tab 3, a negative connection tab 4, and a cap plate 5.

One side of the housing 1 in the axial direction is provided with an opening 11. In one embodiment, the housing 1 is made of aluminum. In an embodiment, the housing 1 is provided in a substantially cylindrical shape.

The winding core 2 is formed by winding a positive plate, a diaphragm and a negative plate. The winding core 2, the positive connecting sheet 3 and the negative connecting sheet 4 are accommodated in the shell 1. The two axial ends of the winding core 2 are respectively connected with the positive connecting sheet 3 and the negative connecting sheet 4. In one embodiment, the axial ends of the winding core 2 are connected to the positive and

negative connection pieces

3 and 4 by laser welding.

As shown in fig. 1, the positive connecting piece 3 is disposed on one side of the housing 1 away from the opening 11 and is in interference fit with the inner wall of the housing 1. Specifically, when core 2, positive connection piece 3 and negative connection piece 4 assemble into shell 1, need heat earlier shell 1 and make shell 1 thermal expansion, then will roll core 2, positive connection piece 3 and negative connection piece 4 and impress in shell 1, realize shell 1 and positive connection piece 3's interference fit through shell 1's expend with heat and contract with cold. The shell 1 is in interference fit with the positive connecting sheet 3, so that looseness of the position of the positive connecting sheet 3 when the super capacitor is used in a vibration environment is prevented, and the service life of the super capacitor is prevented from being influenced by rising internal resistance caused by looseness. In one embodiment, the positive connecting piece 3 is made of aluminum.

In one embodiment, as shown in fig. 3, the positive connecting piece 3 includes a bent portion 31 extending axially toward the negative connecting piece 4, and the bent portion 31 is connected to the housing 1 via ultrasonic welding. In one embodiment, the number of pads is 2-6. Kink 31 and 1 welded connection of shell to kink 31 can be firmly fixed in shell 1, avoids shell 1 to appear expend with heat and contract with cold and lead to the phenomenon that positive connection piece 3 became invalid with 1 interference fit of shell in actual environment use, has further avoided ultracapacitor system to receive vibrations or the not hard up phenomenon in 3 positions of positive connection piece when assaulting, has guaranteed ultracapacitor system's life.

In an embodiment, as shown in fig. 1 and 3, the housing 1 is further provided with a first protrusion 12 protruding radially inward, the first protrusion 12 is disposed adjacent to the bent portion 31, and at least a portion of the first protrusion 12 is in contact with the bent portion 31 of the positive connection piece 3. The first protrusion 12 protrudes inward, so that the diameter of the housing 1 at the position of the first protrusion 12 is smaller than the diameters at other positions, and the bent portion 31 can be stopped, thereby preventing the positive connecting piece 3 from changing in position along the axial direction, and further improving the position stability of the positive connecting piece 3. In one embodiment, the first protrusions 12 are recessed inwardly to a depth of 1-2 mm. It should be noted that the positive connecting piece 3 can be firmly fixed in the housing 1 through the triple fixing effects of interference fit, laser welding connection and the first protrusion 12, so that the phenomenon that the position of the positive connecting piece 3 is loose when the super capacitor is subjected to vibration and impact or used in a high-temperature and cold environment is effectively avoided, and the service life of the super capacitor is ensured.

As shown in fig. 6, the positive connection piece 3 is further provided with a plurality of second welding regions 32 and a plurality of second fixing holes 33, and the second welding regions 32 and the second fixing holes 33 are alternately arranged in the circumferential direction of the positive connection piece 3. The second welding area 32 is used for welding the positive tab 3 to one end of the reeling core 2. The second plurality of fixing holes 33 are for fitting with a mounting jig when fitted into the housing 1. In one embodiment, the number of second weld zones 32 is 4-6; the number of the second fixing holes 33 corresponds to the number of the second welding areas 32.

In an embodiment, the positive connecting plate 3 further includes a plurality of second through slots 34, and each second through slot 34 corresponds to one second fixing hole 33 and is communicated with the second fixing hole 33. The second through-grooves 34 are used for the passage of the electrolyte inside the housing 1. Second through groove 34 sets up with second welding area 32 interval, compares in second through groove 34 and sets up the welding area's in known technology the centre, can prevent that

positive connection piece

3 and 2 laser welding processes, laser welding orbit from squinting the problem that directly punctures the core that the through groove position leads to, have improved welding process's security.

The negative connection piece 4 is provided on the opening 11 side of the housing 1. As shown in fig. 1, 2, and 4, the negative connection piece 4 is provided with a protruding ring 42 protruding toward the cover 5, and the outer peripheral surface 421 of the protruding ring 42 is attached to the inner surface 52 of the lower end of the cover 5. Referring to fig. 5, the negative connector piece 4 is provided with a plurality of first welding regions 43 and a plurality of first fixing holes 44, the first welding regions 43 and the first fixing holes 44 being alternately arranged in a circumferential direction of the negative connector piece 4. The first welding area 43 is used for welding the negative connection tab 4 to one end of the reeling core 2. The first fixing hole 44 is used to mate with a mounting fixture when fitted into the housing 1. The negative connecting piece 4 further comprises a plurality of first through grooves 45, and each first through groove 45 corresponds to one first fixing hole 44 and is communicated with the first fixing hole 44. The first through groove 45 is used for passing the electrolyte in the case 1. First logical groove 45 sets up with first welding region 43 interval, compares in first logical groove 45 sets up the welding region's in known technology the centre, can prevent

negative connection piece

4 and 2 laser welding processes, the laser welding orbit of book core 2 skew to the problem that the core was rolled up in the direct puncture that leads to of groove position, has improved welding process's security. In one embodiment, the negative connecting plate 4 is made of aluminum.

The cover 5 is disposed at one side of the opening 11 of the housing 1 and closes the opening 11. In one embodiment, the cover plate 5 is made of aluminum. The lower end of the cover plate 5 is provided with a stepped structure 51, the stepped structure 51 comprises a first peripheral surface 511 and a second peripheral surface 512, the diameter of the first peripheral surface 511 is larger than that of the second peripheral surface 512, and the negative connecting sheet 4 is abutted against the lower end of the cover plate 5 along the axial direction and is welded with the cover plate 5 on the second peripheral surface 512. The outer peripheral surface 421 of the protruding ring 42 contacts the inner surface 52 of the lower end of the cover 5. In an embodiment, as shown in fig. 4, the end surface 41 of the negative connecting piece 4 extends beyond the second circumferential surface 512 along the circumferential direction, so that the welding slag generated by laser welding can be stopped, and the risk of short circuit caused by the welding slag generated by laser welding splashing down to the winding core 2 is prevented. The lid 5 is further provided with a liquid inlet 53 that penetrates in the axial direction, and the liquid inlet 53 is used for injecting an electrolyte into the case 1.

In the supercapacitor according to the present disclosure, the diameter of the first circumferential surface 511 is greater than that of the second circumferential surface 512, so that the lower end of the cover plate 5 forms a stepped structure, in the process of welding the lower end of the cover plate 5 with the negative connection sheet 4, the welding position is located at the joint of the lower end of the second circumferential surface 512 and the negative connection sheet 4, the stepped structure can stop welding slag from splashing to the first circumferential surface 511, prevent the welding slag from adhering to the first circumferential surface 511 to form an uneven bulge, and influence the sealing effect between the sealing ring 6 and the first circumferential surface 511, which is described below, thereby protecting the first circumferential surface 511 and improving the sealing performance between the cover plate 5 and the housing 1.

The super capacitor is also provided with a sealing ring 6 and an insulating ring 7.

The seal ring 6 is interposed between the first peripheral surface 511 and the inner wall of the housing 1. The sealing ring 6 is used for sealing between the cover plate 5 and the housing 1. In an embodiment, the material of the sealing ring 6 is one of butyl rubber (IIR), ethylene propylene rubber (EPDM), nitrile rubber (NBR), silicone rubber sil (silicone rubber), but is not limited thereto, and may be other materials as long as the sealing performance can be achieved.

The housing 1 is further provided with a second projection 13 projecting radially inward, at least part of the second projection 13 being in contact with the seal ring 6. The second protrusion 13 protrudes inwards, so that the diameter of the shell 1 at the position of the second protrusion 13 is smaller than the diameters of other positions, the stop function of the sealing ring 6 can be realized, the axial position change of the sealing ring 6 when the sealing ring is impacted or vibrated can be prevented, the position stability of the sealing ring 6 is improved, and the sealing performance is ensured. In one embodiment, the second protrusions 13 are recessed inwardly to a depth of 1-2 mm.

An end of the insulating collar 7 is located adjacent the sealing collar 6 and extends beyond the open end 11 of the housing 1, the insulating collar 7 spacing the housing 1 from the cover plate 5. The insulating ring 7 is clamped between the cover plate 5 and the shell 1, so that the shell 1 is ensured not to be in contact with the cover plate 5, and the insulation between the cover plate 5 and the shell 1 is ensured. In an embodiment, the material of the insulating ring 7 is one of pfa (polyfluoroalkoxy), ptfe (polytetrafluoroethylene), ETFE (Ethylene-tetrafluoroethylene), but is not limited thereto, and may be other materials capable of achieving an insulating function.

The super capacitor further comprises a metal plug 8 and a sealing plug 9, wherein the metal plug 8 is plugged into the liquid injection hole 53, and the upper part of the metal plug 8 is hermetically connected with the cover plate 5 through laser welding. In one embodiment, the metal plug 8 is an aluminum plug. The sealing plug 9 is plugged into the liquid injection hole 53 and is positioned above the metal plug 8, and the sealing plug 9 is arranged to further seal the liquid injection hole 53. In one embodiment, the sealing plug 9 is a rubber plug.

It is noted that the above detailed description describes a number of exemplary embodiments, but is not intended to limit the disclosure to the explicitly disclosed combinations. Thus, unless otherwise specified, various features disclosed herein can be combined together to form a number of additional combinations that are not shown for the sake of brevity.

Claims

1. A super capacitor is characterized by comprising a shell (1), a winding core (2), a positive connecting sheet (3), a negative connecting sheet (4) and a cover plate (5),

an opening (11) is formed in one axial side of the shell (1), the winding core (2), the positive connecting sheet (3) and the negative connecting sheet (4) are accommodated in the shell (1), and two axial ends of the winding core (2) are respectively connected to the positive connecting sheet (3) and the negative connecting sheet (4);

the cover plate (5) is arranged on one side of the opening (11) of the shell (1) and closes the opening (11), a stepped structure (51) is arranged at the lower end of the cover plate (5), the stepped structure (51) comprises a first peripheral surface (511) and a second peripheral surface (512), the diameter of the first peripheral surface (511) is larger than that of the second peripheral surface (512), and the negative connecting piece (4) is axially abutted against the lower end of the cover plate (5) and is welded with the cover plate (5) on the second peripheral surface (512).

2. The supercapacitor according to claim 1, characterized in that the end face (41) of the negative connection tab (4) extends circumferentially beyond the second circumferential face (512).

3. The supercapacitor according to claim 1, characterised in that the negative connection tab (4) is provided with a collar (42) protruding towards the cover plate (5), the outer circumferential surface (421) of the collar (42) being in contact with the inner side surface (52) of the lower end of the cover plate (5).

4. The supercapacitor according to claim 1, characterised in that the negative connection tab (4) is provided with a plurality of first welding areas (43) and a plurality of first fixing holes (44), the first welding areas (43) alternating with the first fixing holes (44) in the circumferential direction of the negative connection tab (4).

5. The supercapacitor according to claim 4, characterized in that the negative connection tab (4) further comprises a plurality of first through slots (45), each first through slot (45) corresponding to one of the first fixing holes (44) and communicating with the first fixing hole (44).

6. The supercapacitor according to claim 1, characterised in that the positive connection tab (3) is provided on the side of the housing (1) remote from the opening (11) and has an interference fit with the inner wall of the housing (1).

7. The supercapacitor according to claim 6, characterised in that the positive connection tab (3) comprises a bend (31) extending in axial direction, the bend (31) being connected with the housing (1) via ultrasonic welding.

8. The supercapacitor according to claim 6, characterised in that the housing (1) is further provided with a first protrusion (12) protruding radially inwards, at least part of the first protrusion (12) being in contact with the bent portion (31) of the positive connection tab (3).

9. The supercapacitor according to claim 1, characterised in that the positive connection tab (3) is provided with a plurality of second welding areas (32) and a plurality of second fixing holes (33), the second welding areas (32) and the second fixing holes (33) being arranged alternately in the circumferential direction of the positive connection tab (3);

the positive connecting piece (3) further comprises a plurality of second through grooves (34), and each second through groove (34) corresponds to one second fixing hole (33) and is communicated with the second fixing hole (33).

10. The supercapacitor according to claim 1,

the supercapacitor further comprises a sealing ring (6) and an insulating ring (7), the sealing ring (6) is clamped between the first peripheral surface (511) and the inner wall of the shell (1), one end of the insulating ring (7) is arranged adjacent to the sealing ring (6) and extends beyond the opening (11) end of the shell (1), and the shell (1) is spaced from the cover plate (5) by the insulating ring (7);

the housing (1) is provided with a second protrusion (13) protruding radially inward, at least a portion of the second protrusion (13) being in contact with the seal ring (6).