Super capacitor with full-tab welding type structure

Abstract

The utility model provides a super capacitor with a full-tab welding type structure, which relates to the technical field of capacitor design, and comprises a cover plate assembly, the cover plate assembly comprises an upper plastic, an aluminum substrate, a lower plastic and an adapter sheet which are sequentially arranged from top to bottom, the periphery of the aluminum substrate abuts against the top of a shell and is fixed through laser welding, and the adapter sheet is arranged on the top of the shell. The adapter plate and the upper current collector are fixed through laser welding, and the positive pole lug and the negative pole lug of the roll core assembly are respectively fixed with the lower current collector and the upper current collector through laser welding. And through the cylindrical structure, the internal connection completely adopts laser welding, the internal resistance can reach below 1 milliohm, and the blank of the domestic low-internal-resistance super capacitor is filled. Compared with an ox horn type supercapacitor, the supercapacitor provided by the utility model has the advantages that the overcurrent capability is higher, the internal resistance is lower, the overall vibration resistance is better due to the adoption of laser welding fixation, and the condition of liquid leakage is not easy to occur.

Description

Technical Field

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

[0002] Supercapacitors, also known as ultracapacitors or supercapacitors, are high-capacity capacitors that fall between electrolytic capacitors and rechargeable batteries. They combine the rapid charge and discharge characteristics of capacitors with the energy storage properties of batteries, offering significant advantages such as fast charging, environmental friendliness, wide temperature tolerance, and high output power. These characteristics have led to their widespread application in new energy, rail transportation, industry, power grids, and consumer electronics.

[0003] At present, most supercapacitors are non-full-tab structures, which have high internal resistance and generate large heat, and are not suitable for some fields with high heat dissipation requirements. The supercapacitors used in wind power and energy storage fields are basically rolled-edge sealed structures, which are prone to leakage in harsh vibration environments. Therefore, in the fields of automotive and military industries, it is urgent to develop a new full-tab welded structure to meet the stringent requirements of high heat dissipation and strong vibration. Utility Model Content

[0004] The purpose of this application is to solve the technical problems of high internal resistance and high heat generation of supercapacitor structures in the prior art.

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

[0006] A supercapacitor with a full-tab welded structure includes a cover assembly, an upper current collector, a core assembly, a lower current collector and a shell. The cover assembly, upper current collector, core assembly and lower current collector are arranged in sequence in the vertical direction within the shell. The shell is a cylindrical shell with an opening on one side. The cover assembly includes an upper plastic, an aluminum substrate, a lower plastic and a transfer piece arranged in sequence from top to bottom. The cover assembly also includes a vertically arranged negative electrode column, which passes through the upper plastic, aluminum substrate, lower plastic and transfer piece. The outer periphery of the aluminum substrate is abutted against the top of the shell and fixed by laser welding. The transfer piece is fixed to the upper current collector by laser welding. The positive and negative electrode tabs of the core assembly are fixed to the lower current collector and the upper current collector respectively by laser welding.

[0007] Preferably, the cross-section of the negative electrode column in the vertical direction is set in a "T" shape, and a through hole is set in the middle part of the negative electrode column. The through hole passes through the vertical direction of the negative electrode column. The through hole is filled with a rubber plug and an aluminum plug, wherein the rubber plug is located on the inward side of the through hole, and the aluminum plug is fixed to the top of the through hole by laser welding.

[0008] Preferably, the aluminum substrate includes an outer step portion and an inner supporting portion, the step portion and the supporting portion are integrally formed, a top plate step is provided on the outer periphery of the step portion for supporting each other with the top of the outer shell, and the top surface of the step portion is higher than the top surface of the upper plastic; the outer wall of the step portion is also provided with a chamfer.

[0009] Preferably, the supporting portion is located below the upper plastic, and the top surface of the supporting portion and the bottom surface of the lower plastic are arranged to support each other, the bottom surface of the supporting portion is lower than the bottom surface of the step portion, and the bottom surface of the supporting portion and the bottom surface of the step portion are connected by an inclined surface.

[0010] Preferably, a limiting groove is provided on the side surface of the adapter plate opposite to the step portion, and the limiting grooves are arranged corresponding to each other. The lower plastic is located between the adapter plate and the aluminum substrate, and the upper and lower sides of the lower plastic are respectively provided with limiting bosses embedded in the limiting groove, which are fixed by the mutual cooperation between the limiting bosses and the limiting grooves.

[0011] Preferably, a bottom portion of the lower plastic is fitted with the step portion, and the remaining portion extends toward the negative electrode column and is embedded between the supporting portion and the adapter plate.

[0012] Preferably, the cover plate assembly further comprises a sealing ring, which is fitted on the outer periphery of the negative electrode column. The cross section of the sealing ring in the vertical direction is in an inverted "T" shape. The outer side wall of the transverse portion of the sealing ring abuts against the inner side wall of the lower plastic. The bottom surface of the transverse portion of the sealing ring abuts against the adapter plate. The outer portion of the vertical portion of the sealing ring abuts against the abutting portion.

[0013] Preferably, the upper current collector is a bowl-shaped structure with its opening pointing upward, wherein the top edge of the upper current collector and the transfer step of the transfer plate are arranged to abut against each other, and the top edge of the upper current collector and the transfer step are fixed by laser welding.

[0014] Compared with the existing technology, this application has at least the following advantages: the entire supercapacitor adopts a cylindrical structure, and all internal connections are laser welded, with an internal resistance of less than 1 milliohm, filling the gap in domestic low-internal-resistance supercapacitors. Compared with horn-type supercapacitors, the supercapacitor in this application has a stronger current capacity and lower internal resistance. Moreover, because it is fixed by laser welding, the overall vibration resistance is better and it is not prone to leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A cross-sectional view of a supercapacitor with a full-tab welded structure in one embodiment of the present invention;

[0016] Figure 2 This is a schematic diagram of the disassembly of a supercapacitor cover plate assembly with a full-tab welded structure in one embodiment of the present invention.

[0017] Legend:

[0018] 1. Cover plate assembly; 11. Negative electrode; 111. Through hole; 112. Rubber plug; 113. Aluminum plug; 114. Annular groove; 12. Upper plastic; 13. Aluminum substrate; 131. Step; 1311. Chamfer; 1312. Inclined surface; 132. Abutment; 133. Positioning groove; 14. Adapter; 141. Adapter step; 15. Lower plastic; 151. Positioning boss; 152. Strip groove; 16. Sealing ring; 2. Upper current collector; 21. Through hole;

[0019] 3. Core assembly; 4. Lower current collector; 41. Extension portion; 5. Outer shell; 52. Through slot; 6. Sleeve. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below with reference to specific embodiments.

[0021] See also Figure 1 and Figure 2 A supercapacitor with a full-tab welded structure includes a cover plate assembly 1, an upper current collector 2, a winding core assembly 3, a lower current collector 4, a housing 5, and a sleeve 6. The cover plate assembly 1, upper current collector 2, winding core assembly 3, and lower current collector 4 are vertically arranged in sequence within the housing 5, which is a cylindrical shell with an open side. The sleeve 6 is sleeved around the outer circumference of the housing 5. In one embodiment, the upper current collector 2 is made of aluminum or copper, the lower current collector 4 is made of aluminum, and the housing 5 is made of aluminum or steel.

[0022] In one embodiment, see Figure 1 and Figure 2 The cover assembly 1 includes a negative electrode column 11, an upper plastic 12, an aluminum substrate 13, a lower plastic 15, an adapter 14 and a sealing ring 16, wherein the negative electrode column 11 extends in the vertical direction, the upper plastic 12, the aluminum substrate 13, the lower plastic 15 and the adapter 14 are arranged in sequence in the vertical direction, and the sealing ring 16 is located on the outer periphery of the negative electrode column 11. The upper plastic 12, the aluminum substrate 13, the lower plastic 15, the adapter 14 and the sealing ring 16 are all provided with openings in the middle for passing the negative electrode column 11.

[0023] See also Figure 1 and Figure 2In one embodiment, the negative electrode column 11 is made of aluminum, copper, or a copper-aluminum composite material. The cross-section of the negative electrode column 11 in the vertical direction is T-shaped. A through hole 111 is provided in the middle part of the negative electrode column 11. The through hole 111 passes through the vertical direction of the negative electrode column 11. The through hole 111 is filled with a rubber plug 112 and an aluminum plug 113, wherein the rubber plug 112 is located on the inward side of the through hole 111, and the aluminum plug 113 is fixed to the top of the through hole 111 by laser welding. In one embodiment, the rubber plug 112 is made of EPDM rubber or fluororubber. In one embodiment, an annular groove 114 is provided at the bottom of the negative electrode column 11, and the annular groove 114 and the inner side surface of the adapter 14 are arranged to abut against each other.

[0024] See also Figure 1 and Figure 2 The upper plastic 12 is one or a combination of special engineering plastics such as PPS, PEEK, PI, etc. The upper plastic 12 is arranged in a circular ring shape, and the top of the upper plastic 12 and the horizontal bottom of the "T" shape of the negative electrode column 11 are arranged to abut against each other, and the inner wall of the upper plastic 12 and the outer wall of the vertical part of the negative electrode column 11 are arranged to abut against each other.

[0025] The aluminum substrate 13 is made of aluminum or steel. In one embodiment, the aluminum substrate 13 includes an outer step portion 131 and an inner supporting portion 132. The step portion 131 and the supporting portion 132 are integrally formed. A top plate step is provided on the outer periphery of the step portion 131 for supporting each other with the top of the shell 5, and the top surface of the step portion 131 is higher than the top surface of the upper plastic 12; the outer wall of the step portion 131 is also provided with a chamfer 1311, which facilitates the assembly of the aluminum substrate 13 into the shell.

[0026] The abutting portion 132 is located below the upper plastic portion 12, and the top surface of the abutting portion 132 abuts against the bottom surface of the lower plastic portion 15. In one embodiment, the bottom surface of the abutting portion 132 is lower than the bottom surface of the step portion 131, and the bottom surfaces of the abutting portion 132 and the step portion 131 are connected by an inclined surface 1312.

[0027] The adapter plate 14 is made of aluminum or copper and is arranged in a circular ring shape. The inner side wall of the adapter plate 14 is matched with the annular groove 114 of the negative electrode column 11. A adapter step 141 is provided on the outer periphery of the bottom of the adapter plate 14 for connecting and fixing with the upper current collector 2.

[0028] In one embodiment, a limiting groove 133 is provided on a side surface of the adapter plate 14 opposite to the step portion 131 . The limiting grooves 133 are provided corresponding to each other and are used to fix the lower plastic 15 between the adapter plate 14 and the aluminum substrate 13 .

[0029] See also Figure 1 and Figure 2 In one embodiment, the lower plastic 15 is made of corrosion-resistant engineering plastic such as PP or PEEK. It is positioned between the adapter plate 14 and the aluminum substrate 13 and has a circular ring shape. Positioning bosses 151 are provided on the upper and lower sides of the lower plastic 15, respectively, and are embedded in the position-limiting grooves 133. The positioning bosses 151 and the position-limiting grooves 133 cooperate to prevent displacement of the lower plastic 15. In one embodiment, the bottom portion of the lower plastic 15 is aligned with the step 131, while the remaining portion extends toward the negative electrode 11 and is embedded between the abutment 132 and the adapter plate 14. In one embodiment, strip grooves 152 extending radially along the lower plastic 15 are provided below the lower plastic 15. These strip grooves 152 are arranged in a circumferential array and, in one embodiment, are located between adjacent position-limiting bosses 151.

[0030] The sealing ring 16 is made of EPDM rubber or fluororubber, and is attached to the outer periphery of the negative electrode column 11. In one embodiment, the cross-section of the sealing ring 16 in the vertical direction is an inverted "T" shape, and the outer side wall of the horizontal part of the sealing ring 16 and the inner side wall of the lower plastic 15 are mutually abutted. The bottom surface of the horizontal part of the sealing ring 16 and the adapter plate 14 are mutually abutted, and the outer part of the vertical part of the sealing ring 16 and the abutting portion 132 are mutually abutted.

[0031] See also Figure 1 and Figure 2 The upper current collector 2 has a bowl-shaped structure with its opening pointing upward. The top edge of the upper current collector 2 abuts against the transfer step 141 of the transfer plate 14. In one embodiment, the top edge of the upper current collector 2 and the transfer step 141 are fixed by laser welding. The upper current collector 2 is provided with through holes 21 arranged in a row along its circumference.

[0032] In one embodiment, see Figure 1 and Figure 2The core assembly 3 is located below the upper current collector 2, and the core assembly 3 is cylindrical, wherein the positive electrode tab of the core assembly 3 is located at the lower end of the core assembly 3, and the negative electrode tab of the core assembly 3 is located above the core assembly 3, and the positive electrode tab and the negative electrode tab are respectively fixed to the lower current collector 4 and the upper current collector 2 by laser welding.

[0033] The lower current collector 4 is located between the bottom of the core assembly 3 and the bottom of the shell 5 . The lower current collector 4 is arranged in a circular ring shape, and the middle portion of the lower current collector 4 extends downward to form an extension portion 41 .

[0034] See also Figure 1 The housing 5 is a cylindrical shell with one end open. In one embodiment, an explosion-proof wire is provided on the outer periphery of the housing 5. A through-groove 52 is provided at the bottom of the housing 5, and the through-groove 52 is matched with the extension 41. In one embodiment, the through-groove 52 and the extension 41 are fixed by laser welding.

[0035] See also Figure 1 The sleeve 6 is sleeved on the outer periphery of the shell 5. In one embodiment, the sleeve can be made of PVC, PET, PI or UV spray material.

[0036] This application provides a supercapacitor with a fully welded tab structure. The entire supercapacitor adopts a cylindrical structure, and all internal connections are laser welded. Its internal resistance can reach below 1 milliohm, filling the gap in domestic low-internal-resistance supercapacitors. Compared with horn-type supercapacitors, the supercapacitor in this application has stronger current capacity and lower internal resistance. Because it is fixed by laser welding, the overall vibration resistance is better and it is less prone to leakage.

Claims

1. A supercapacitor with a full-tab welded structure, comprising a cover plate assembly, an upper current collector, a winding core assembly, a lower current collector, and a housing, wherein the cover plate assembly, the upper current collector, the winding core assembly, and the lower current collector are arranged in sequence along a vertical direction within the housing, which is a cylindrical shell with an opening on one side, characterized in that: The cover plate assembly includes an upper plastic, an aluminum substrate, a lower plastic and a transfer plate arranged in sequence from top to bottom, and the cover plate assembly also includes a vertically arranged negative electrode column, which passes through the upper plastic, aluminum substrate, lower plastic and transfer plate. The outer periphery of the aluminum substrate is abutted against the top of the outer shell and fixed by laser welding. The transfer plate is fixed to the upper current collector by laser welding. The positive electrode tab and the negative electrode tab of the core assembly are respectively fixed to the lower current collector and the upper current collector by laser welding.

2. The supercapacitor with a full-tab welded structure according to claim 1, characterized in that: The cross-section of the negative electrode column in the vertical direction is "T"-shaped, and a through hole is provided in the middle part of the negative electrode column. The through hole passes through the vertical direction of the negative electrode column. The through hole is filled with a rubber plug and an aluminum plug, wherein the rubber plug is located on the inward side of the through hole, and the aluminum plug is fixed to the top of the through hole by laser welding.

3. The supercapacitor with a full-tab welded structure according to claim 2, characterized in that: The aluminum substrate includes an outer step portion and an inner supporting portion, the step portion and the supporting portion are integrally formed, a top plate step is provided on the outer periphery of the step portion for supporting each other with the top of the shell, and the top surface of the step portion is higher than the top surface of the upper plastic; the outer wall of the step portion is also provided with a chamfer.

4. The supercapacitor with a full-tab welded structure according to claim 3, characterized in that: The supporting portion is located below the upper plastic, and the top surface of the supporting portion and the bottom surface of the lower plastic are arranged to support each other. The bottom surface of the supporting portion is lower than the bottom surface of the step portion, and the bottom surface of the supporting portion and the bottom surface of the step portion are connected by an inclined surface.

5. The supercapacitor with a full-tab welded structure according to claim 3, characterized in that: A limiting groove is provided on the side surface of the adapter plate opposite to the step portion, and the limiting grooves are arranged corresponding to each other. The lower plastic is located between the adapter plate and the aluminum substrate, and the upper and lower sides of the lower plastic are respectively provided with limiting bosses embedded in the limiting grooves, and are fixed by the mutual cooperation between the limiting bosses and the limiting grooves.

6. The supercapacitor with a full-tab welded structure according to claim 4, characterized in that: The bottom portion of the lower plastic is fitted with the step portion, and the remaining portion extends toward the negative electrode column and is embedded between the supporting portion and the adapter plate.

7. The supercapacitor with a full-tab welded structure according to claim 6, characterized in that: The cover plate assembly also includes a sealing ring, which is attached to the outer periphery of the negative electrode column. The cross-section of the sealing ring in the vertical direction is an inverted "T" shape. The outer wall of the horizontal part of the sealing ring and the inner wall of the lower plastic are mutually abutted. The bottom surface of the horizontal part of the sealing ring and the adapter are mutually abutted. The outer part of the vertical part of the sealing ring and the abutting part are mutually abutted.

8. The supercapacitor with a full-tab welded structure according to claim 7, characterized in that: The upper current collector is a bowl-shaped structure with an opening pointing upward, wherein the top edge of the upper current collector and the transfer step of the transfer plate are arranged to abut against each other, and the top edge of the upper current collector and the transfer step are fixed by laser welding.

Images