High-capacity supercapacitor with welding type structure

Abstract

The utility model provides a large-capacity super capacitor with a welding type structure, which relates to the technical field of capacitor design, and adopts the technical scheme that the large-capacity super capacitor comprises a cover plate, the cover plate comprises a negative pole located at the center position, the negative pole is vertically arranged, the bottom wall of the negative pole extends outwards to form an extension part, the extension part is in a circular ring shape, and the bottom wall of the negative pole is provided with a plurality of through holes; the cover plate further comprises a switching piece fixed with the upper current collector, the top of the switching piece abuts against the lower portion of the extension part, and the bottom of the switching piece and the bottom face of the negative pole are arranged in a coplanar mode; the cover plate further comprises a welding piece, an insulation pad and a substrate which are sequentially arranged from top to bottom, through holes penetrating in the vertical direction are formed in the middle of the switching piece, the middle of the welding piece, the middle of the insulation pad and the middle of the substrate, and all the parts of the cover plate are fixed through laser welding. Compared with a curled edge sealing structure, the super capacitor is higher in overcurrent capacity, lower in internal resistance, better in anti-vibration performance and not prone to liquid leakage.

Description

Technical Field

[0001] The utility model relates to the technical field of capacitor design, in particular to a large-capacity supercapacitor with a welded structure. Background Art

[0002] Supercapacitors, also known as electrochemical capacitors or double-layer capacitors, are a new type of energy storage device between traditional capacitors and rechargeable batteries. They are widely used in household appliances, power tools, energy storage devices, smart meters, new energy power generation systems, and distributed power grids. Supercapacitors are increasingly used in the market due to their advantages such as high power density, fast charging and discharging, long cycle life (up to 500,000 to 1 million times) and wide operating temperature range (-40°C to +80°C). At present, the global supercapacitor market continues to grow and is expected to maintain a high growth trend in the next few years. With the continued development of downstream industries such as new energy, power grid construction and consumer electronics, the market demand for supercapacitors will further expand.

[0003] In the existing technology, most large-capacity supercapacitors have a rolled edge sealing structure, which has insufficient sealing strength. In extreme cases, the seal will burst, posing a safety hazard. Therefore, this structure is not suitable for some fields with high safety requirements, such as energy storage, automobiles, etc. In addition, in harsh vibration environments, this rolled edge sealing structure is more prone to leakage. Therefore, in the fields of energy storage, automotive, military, etc., it is urgent to develop a new large-capacity supercapacitor welded structure to meet the stringent requirements of high safety and strong vibration. Utility Model Content

[0004] The purpose of the utility model is to solve the technical problem that the sealing strength of the supercapacitor adopting the curling sealing structure in the prior art is insufficient and the seal may burst in extreme cases.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A large-capacity supercapacitor with a welded structure, comprising a cover plate, an upper current collector, a winding core and a lower current collector arranged in sequence from top to bottom, wherein the cover plate, the upper current collector, the winding core and the lower current collector are fixed on opposite sides by welding, respectively. The capacitor also includes a shell and a sleeve, the cover plate includes a negative electrode column located at a central position, the negative electrode column is arranged vertically, and the bottom wall of the negative electrode column is provided with an extension portion extending outward, the extension portion is circular, the cover plate also includes a transition piece fixed to the upper current collector, the top of the transition piece abuts against the bottom of the extension portion, and the bottom of the transition piece is arranged coplanar with the bottom surface of the negative electrode column; the cover plate also includes a welding piece, an insulating pad and a substrate arranged in sequence from top to bottom, the transition piece welding piece, the insulating pad and the middle of the substrate are all provided with through holes penetrating in the vertical direction, and the various components of the cover plate are fixed by laser welding.

[0007] Preferably, a sealing ring is provided above the extension portion, and the bottom of the sealing ring is abutted against the bottom of the extension portion. A lower plastic is also provided between the substrate and the adapter piece, and the upper and lower side surfaces of the lower plastic are respectively abutted against the substrate and the adapter piece. The thickness of the lower plastic is equal to the sum of the thickness of the extension portion and the sealing ring.

[0008] Preferably, an annular groove is provided below the lower plastic, and a strip groove is provided on the outer side of the annular groove extending outward along the radial direction of the lower plastic.

[0009] Preferably, the welding piece is welded and fixed to the outer periphery of the negative electrode column, the cross section of the welding piece in the vertical direction is arranged in a "T" shape, and the upper part of the insulating pad is arranged to cover the side and bottom of the welding piece.

[0010] Preferably, the substrate is a substrate made of metal material, the substrate is arranged in a circular ring shape, a step portion is provided below the outer peripheral side of the substrate, the substrate is supported on the top of the shell through the step portion, the middle of the substrate is recessed downward to form a embedding groove, the embedding groove is used to embed the insulating pad, the inner diameter of the through hole in the middle of the substrate is larger than that of the negative electrode column, and the substrate is supported against the negative electrode column through the insulating pad.

[0011] Preferably, the negative electrode column is vertically arranged, and a liquid injection hole is provided in the middle of the negative electrode column. The liquid injection hole is provided through the negative electrode column, and the liquid injection hole is in a shape of being larger at the top and smaller at the bottom.

[0012] Preferably, the injection hole is filled with a metal plug and a rubber plug, wherein the rubber plug is located at the lower part of the injection hole, and the metal plug is located above the injection hole, and the metal plug is fixed to the peripheral side wall of the injection hole by laser welding.

[0013] Compared with the existing technology, the present application provides a large-capacity supercapacitor with a welded structure. The overall structure adopts a cylindrical structure, and the internal connections are fixed by laser welding. Its internal resistance can reach below 0.15 milliohms, filling the gap in domestic low-internal-resistance supercapacitors. In addition, compared with the crimped sealing structure, the supercapacitor of the present application has a stronger current capacity, lower internal resistance, better vibration resistance, and is not easy to leak. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the overall structure of a large-capacity supercapacitor with a welded structure in one embodiment of the present invention;

[0015] Figure 2 This is a schematic diagram of the disassembled structure of a large-capacity supercapacitor with a welded structure in one embodiment of the present invention;

[0016] Figure 3 This is a schematic cross-sectional view of a large-capacity supercapacitor with a welded structure in one embodiment of the present invention;

[0017] Figure 4 This is a cross-sectional schematic diagram of an upper cover plate portion of a large-capacity supercapacitor with a welded structure in one embodiment of the present invention;

[0018] Figure 5 This is a schematic structural diagram of an upper winding core of a large-capacity supercapacitor with a welded structure in one embodiment of the present invention.

[0019] Legend:

[0020] 1. Cover plate; 11. Negative electrode; 111. Liquid injection hole; 112. Rubber plug; 113. Metal plug; 114. Extension; 12. Sealing ring; 13. Adapter; 131. Opening; 14. Welding piece; 15. Insulation pad;

[0021] 16. Substrate; 161. Step; 162. Embedded groove; 17. Lower plastic; 171. Annular groove; 172. Strip groove; 173. Through hole; 2. Upper current collector; 3. Winding core; 31. Winding core body; 32. Isolation membrane; 33. High-temperature tape; 4. Lower current collector; 5. Outer shell; 51. Pressure relief valve; 52. Neck; 53. Positive pole; 6. Sleeve. DETAILED DESCRIPTION

[0022] The present invention will be further described in detail below with reference to specific embodiments.

[0023] See also Figure 1 and Figure 2A large-capacity supercapacitor with a welded structure includes a cover plate 1, an upper current collector 2, a winding core 3, and a lower current collector 4, which are arranged in sequence from top to bottom. The cover plate 1, the upper current collector 2, the winding core 3, and the lower current collector 4 are fixed on opposite sides by welding. The capacitor also includes a shell 5 and a sleeve 6. The shell 5 is sleeved on the outer periphery of the cover plate 1, the upper current collector 2, the winding core 3, and the lower current collector 4. In one embodiment, the cover plate 1 partially abuts against the top surface of the shell 5, and the sleeve 6 is sleeved on the outer periphery of the shell 5.

[0024] See also Figure 1 and Figure 2 The outer shell 5 is a cylindrical shell with one end open. In one embodiment, the outer shell 5 is made of aluminum. A pressure relief valve 51 is provided on the outer periphery of the outer shell 5. The pressure relief valve 51 is a "C"-shaped groove. The bottom of the outer shell 5 is provided with a constriction 52 and a positive electrode post 53. The constriction 52 is used to fix to the lower current collector 4 by laser welding. The positive electrode post 53 is located at the bottom of the outer shell 5 and extends downward.

[0025] The sleeve 6 is sleeved on the outer periphery of the housing 5 . In one embodiment, the sleeve 6 is made of PVC, PET, PI or UV spraying material.

[0026] See also Figure 3 and Figure 4 The cover plate 1 includes a negative electrode column 11 located at the center, the negative electrode column 11 is arranged vertically, and a liquid injection hole 111 is provided in the middle of the negative electrode column 11, and the liquid injection hole 111 is provided through the negative electrode column 11. In one embodiment, the liquid injection hole 111 is in a shape of larger at the top and smaller at the bottom, and the liquid injection hole 111 is filled with a metal plug 113 and a rubber plug 112, wherein the rubber plug 112 is located at the lower part of the liquid injection hole 111, and the metal plug 113 is located above the liquid injection hole 111. In one embodiment, the metal plug 113 is an aluminum metal plug 113, and the metal plug 113 is fixed to the surrounding side wall of the liquid injection hole 111 by laser welding.

[0027] In order to fix the negative electrode column 11, in one embodiment, an extension portion 114 is extended outward from the bottom wall of the negative electrode column 11, and the extension portion 114 is in a circular shape. A sealing ring 12 is provided above the extension portion 114, and both the sealing ring 12 and the extension portion 114 are in a circular shape, and the bottom of the sealing ring 12 is abutted against the bottom of the extension portion 114.

[0028] The cover plate 1 also includes a transition piece 13 fixed to the upper current collector 2. The top of the transition piece 13 abuts below the extension 114, and the bottom of the transition piece 13 is coplanar with the bottom surface of the negative electrode column 11. The transition piece 13 is provided with a plurality of circular openings 131 extending therethrough and arranged in an array along the circumference of the transition piece 13.

[0029] In one embodiment, the cover plate 1 further includes a welding plate 14, which is disc-shaped and welded to the outer periphery of the negative electrode column 11. An insulating pad 15 is provided below the welding plate 14 to facilitate a stable connection between the insulating pad 15 and the welding plate 14. In one embodiment, the cross-section of the welding plate 14 in the vertical direction is T-shaped, and the upper side of the insulating pad 15 is covered on the side and bottom of the welding plate 14.

[0030] A base plate 16 is provided below the insulating pad 15. The base plate 16 is made of metal and is arranged in a circular ring shape. A step portion 161 is provided below the outer circumference of the base plate 16. The base plate 16 is supported on the top of the housing 5 by the step portion 161. The middle of the base plate 16 is recessed downward to form an embedding groove 162. The embedding groove 162 is used to embed the insulating pad 15 so as to fix the position between the insulating pad 15 and the base plate 16. In one embodiment, the projection of the embedding groove 162 in the vertical direction is hexagonal.

[0031] In one embodiment, a lower plastic member 17 is disposed between the base plate 16 and the adapter plate 13. The upper and lower side surfaces of the lower plastic member 17 are respectively disposed to abut against the base plate 16 and the adapter plate 13. In one embodiment, an annular groove 171 is disposed below the lower plastic member 17. A strip groove 172 is disposed on the outer side of the annular groove 171, extending outward along the radius of the lower plastic member 17. The thickness of the lower plastic member 17 is equal to the sum of the thicknesses of the extension portion 114 and the sealing ring 12.

[0032] The sealing ring 12, the adapter plate 13, the welding plate 14, the insulating pad 15 and the middle of the substrate 16 are all provided with a through hole 173 extending vertically therethrough. The through hole 173 is used for passing the negative electrode column 11. In one embodiment, the inner diameter of the through hole 173 in the middle of the substrate 16 is larger than that of the negative electrode column 11, and the substrate 16 is supported against the negative electrode column 11 through the insulating pad 15.

[0033] The upper current collector 2 is fixed to the cover plate 1 by being fixed to the adapter plate 13. In one embodiment, the cross-section of the upper current collector 2 in the vertical direction is U-shaped with the opening facing upward, and the U-shaped side of the upper current collector 2 is fixed to the adapter plate 13 by laser welding.

[0034] See also Figure 5 The core 3 includes a core 3 body and a separator 32. The core 3 body winds the positive electrode sheet and the negative electrode sheet together in a winding manner. The separator 32 is located between the positive and negative electrode sheets of the core 3 body. The core 3 assembly also includes a high-temperature tape 33 wound on the upper part; the core 3 body is a cylindrical structure, wherein the positive electrode tab is located at the lower end of the core 3 body and is connected to the lower current collector 4 by laser welding, and the negative electrode tab is located above the core 3 body and is connected to the upper current collector 2 by laser welding.

[0035] Compared with the existing technology, the present application provides a large-capacity supercapacitor with a welded structure. The overall structure adopts a cylindrical structure, and the internal connections are fixed by laser welding. Its internal resistance can reach below 0.15 milliohms, filling the gap in domestic low-internal-resistance supercapacitors. In addition, compared with the crimped sealing structure, the supercapacitor of the present application has a stronger current capacity, lower internal resistance, better vibration resistance, and is not easy to leak.

Claims

1. A large-capacity supercapacitor with a welded structure, comprising a cover plate, an upper current collector, a winding core, and a lower current collector, arranged in order from top to bottom, wherein the cover plate, the upper current collector, the winding core, and the lower current collector are fixed on opposite sides by welding, and the capacitor further comprises a housing and a sleeve, characterized in that: The cover plate includes a negative electrode column located at a central position, the negative electrode column is arranged vertically, and the bottom wall of the negative electrode column is extended outward to provide an extension portion, the extension portion is circular, the cover plate also includes a transition piece fixed to the upper current collector, the top of the transition piece is abutted under the extension portion, and the bottom of the transition piece is coplanar with the bottom surface of the negative electrode column; the cover plate also includes a welding piece, an insulating pad and a substrate arranged in sequence from top to bottom, and the middle of the transition piece welding piece, the insulating pad and the substrate are all positioned with a through hole penetrating in the vertical direction, and the various components of the cover plate are fixed by laser welding.

2. A large-capacity supercapacitor with a welded structure according to claim 1, characterized in that: A sealing ring is provided above the extension portion, and the bottom of the sealing ring is abutted against the bottom of the extension portion. A lower plastic is also provided between the substrate and the adapter piece. The upper and lower side surfaces of the lower plastic are respectively abutted against the substrate and the adapter piece. The thickness of the lower plastic is equal to the sum of the thickness of the extension portion and the sealing ring.

3. A large-capacity supercapacitor with a welded structure according to claim 2, characterized in that: An annular groove is provided below the lower plastic, and a strip groove is provided on the outer side of the annular groove extending outward along the radial direction of the lower plastic.

4. A large-capacity supercapacitor with a welded structure according to claim 3, characterized in that: The welding piece is welded and fixed to the outer periphery of the negative electrode column. The cross section of the welding piece in the vertical direction is set in a "T" shape. The upper part of the insulating pad is covered on the side and bottom of the welding piece.

5. A large-capacity supercapacitor with a welded structure according to claim 4, characterized in that: The substrate is made of metal and is arranged in a circular ring shape. A step portion is provided below the outer circumference of the substrate. The substrate is supported on the top of the shell through the step portion. The middle of the substrate is recessed downward to form an embedding groove. The embedding groove is used to embed the insulating pad. The inner diameter of the through hole in the middle of the substrate is larger than that of the negative electrode column. The substrate is supported against the negative electrode column through the insulating pad.

6. A large-capacity supercapacitor with a welded structure according to claim 5, characterized in that: The negative electrode column is vertically arranged, and a liquid injection hole is arranged in the middle of the negative electrode column. The liquid injection hole is arranged through the negative electrode column, and the liquid injection hole is in a shape of being larger at the top and smaller at the bottom.

7. A large-capacity supercapacitor with a welded structure according to claim 6, characterized in that: The injection hole is filled with a metal plug and a rubber plug, wherein the rubber plug is located at the lower part of the injection hole, and the metal plug is located above the injection hole. The metal plug and the peripheral side wall of the injection hole are fixed by laser welding.

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