High-performance supercapacitor

Abstract

The utility model discloses a high-performance supercapacitor. Comprising a shell internally provided with a mounting cavity, a battery cell arranged in the mounting cavity, a positive current collecting block welded at the bottom of the battery cell by laser, a negative current collecting block welded at the top of the battery cell by laser, an upper cover arranged at the upper end of the shell and used for sealing the mounting cavity, and a positive pole arranged on one side of the top surface of the upper cover, the negative pole assembly is arranged on the other side of the top surface of the upper cover and is connected with the negative current collecting block, the adapter piece is welded on the negative current collecting block by laser and is welded with the lower end of the negative pole assembly by laser, the upper cover is provided with a mounting hole for mounting the negative pole assembly, and the negative pole assembly is hermetically connected with the mounting hole; by limiting the structural composition of the capacitor, a large amount of laser welding is used for sealing parts, the use area of rubber in sealing is reduced, a high-sealing structure is formed, and the internal resistance is reduced.

Description

Technical Field

[0001] The utility model belongs to the field of supercapacitor preparation, and particularly relates to a high-performance supercapacitor. Background Art

[0002] As a newly emerging advanced energy storage device, the supercapacitor combines the high-power characteristics of traditional capacitors and the high-energy characteristics of batteries. Due to its unique high specific power, large current discharge capacity, ultra-low temperature characteristics, as well as high reliability and environmental friendliness, etc., it has been widely applied and developed in many fields such as electric power, transportation, communication, energy, and aviation.

[0003] For existing supercapacitors, foil strips or sheet-shaped lead strips are used for connecting the battery core and the upper cover. Due to the limited contact area, it is difficult to achieve an ideal state when preparing supercapacitors with low internal resistance. At the same time, the battery core pulled by the lead strip is in a non-rigid fixed state of suspension in the shell. Therefore, the durability and anti-vibration ability of the capacitor are affected. Secondly, existing supercapacitors use a sealing rubber ring as the seal between the upper cover and the outer shell. The positive extreme of the battery core is in a rigid fixed state, and the anti-impact and vibration stresses act on the metal current collector block and the outer shell, but the anti-impact and vibration stress action point of the negative extreme is the sealing rubber ring. When the capacitor is subjected to a force perpendicular to its body, the non-rigid fixed state of the negative extreme will affect the rigid fixed connection of the positive extreme, and there is a hidden danger of damage to this connection. At the same time, when the sealing rubber ring is subjected to stress impact for a long time, it will accelerate the failure of the permanent deformation rate and reduce the sealing performance. Finally, after existing supercapacitors are filled with liquid and assembled into a mold, in order to eliminate potential defects and improve the reliability and stability of the capacitors, high-temperature aging treatment is required. When the capacitors are subjected to the first charge and discharge and high-temperature aging, a large amount of moisture and other impurities decompose, generating a series of chemical side reactions, generating new impurity liquids and gases, increasing the internal air pressure of the capacitors, and these impurity liquids and gases will continuously affect the decay of the electrical performance of the capacitors during subsequent use. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a high-performance supercapacitor.

[0005] The utility model adopts the following technical solutions:

[0006] A high-performance supercapacitor, comprising a housing with an installation cavity formed therein, an electric core disposed in the installation cavity, a positive current collector block laser-welded to the bottom of the electric core, a negative current collector block laser-welded to the top of the electric core, an upper cover disposed at the upper end of the housing for sealing the installation cavity, a positive electrode column disposed on one side of the top surface of the upper cover, a negative electrode column assembly disposed on the other side of the top surface of the upper cover and connected to the negative current collector block, and a transfer piece laser-welded to the negative current collector block and laser-welded to the lower end of the negative electrode column assembly. The upper cover is provided with an installation hole for installing the negative electrode column assembly, and a sealed connection is provided between the negative electrode column assembly and the installation hole.

[0007] Further, the negative electrode column assembly includes a negative electrode cover connected to the installation hole, a negative electrode column disposed on the negative electrode cover and extending downward to be laser-welded to the transfer piece, and a seal disposed between the negative electrode column and the upper cover and the negative electrode cover.

[0008] Further, the seal includes a washer sleeved on the negative electrode column and located in the negative electrode cover, and a rubber sealing ring disposed at the lower end of the washer and located between the negative electrode cover and the upper cover.

[0009] Further, the rubber sealing ring is arranged in an I-shaped configuration.

[0010] Further, the negative electrode column includes a negative electrode column terminal located at the upper end of the negative electrode cover, an extension section extending downward from the bottom of the negative electrode terminal for installing the seal, and a connection section disposed at the lower end of the extension section and laser-welded to the transfer piece. A limiting ring for restricting the installation position of the seal is formed on the outer periphery of the upper end of the extension section.

[0011] Further, a threaded connection is provided between the negative electrode cover and the installation hole.

[0012] Further, it further includes a positioning post extending upward from the bottom of the installation cavity. The electric core is formed with a liquid injection channel extending upward from its bottom, and the positioning post can be embedded in the liquid injection channel.

[0013] Further, it further includes a liquid injection hole extending upward from the bottom of the housing and passing through the positioning post to communicate with the liquid injection channel, and a sealed rubber plug assembly for sealing the liquid injection hole.

[0014] Further, the sealed rubber plug assembly includes a rubber plug sealed and fixed in the liquid injection hole and a metal plug for fixing the rubber plug. A threaded connection is provided between the metal plug and the liquid injection hole.

[0015] Further, the metal plug includes a metal plug body embedded in the liquid injection hole and located at the lower end of the rubber plug, and a limiting section disposed on the outer periphery of the metal plug body and in contact connection with the bottom of the housing.

[0016] As described above for the present utility model, compared with the prior art, the beneficial effects of the present utility model are as follows: By defining the structural composition of the capacitor, laser welding is widely used for sealing between components, reducing the usage area of rubber in sealing, forming a high-sealing structure and reducing the internal resistance. At the same time, the structural composition of the negative electrode post is defined, serving as a new stress support point, avoiding the rubber sealing ring from bearing physical stress impact while acting as a seal, and improving the anti-vibration ability and sealing performance of the capacitor. In addition, a liquid injection hole and a sealing rubber plug assembly for sealing the liquid injection hole are provided at the bottom of the outer shell. Through the cooperation between the two, the waste gas and electrolyte after the first charge-discharge high-temperature aging are replaced, reducing the internal air pressure of the supercapacitor while also improving the performance and service life of the capacitor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of a supercapacitor;

[0018] Figure 2 It is an exploded schematic structural diagram of a supercapacitor;

[0019] Figure 3 It is a partial structural sectional view of a supercapacitor;

[0020] Figure 4 For Figure 3 The enlarged view of a partial structure in

[0021] Figure 5 It is a partial structural sectional view of the negative electrode cover;

[0022] Figure 6 It is the structural schematic Figure 1 ;

[0023] Figure 7 It is the structural schematic Figure 2 ;

[0024] Figure 8 It is a partial structural sectional view of the metal plug;

[0025] In the figure, 11 - housing, 12 - battery cell, 13 - positive current collector block, 14 - negative current collector block, 15 - upper cover, 16 - positive electrode post, 17 - negative electrode post assembly, 18 - adapter plate, 19 - positioning post, 20 - liquid injection hole, 21 - sealing rubber plug assembly, 111 - installation cavity, 112 - limiting groove, 121 - liquid injection channel, 131 - slot, 141 - annular boss, 151 - installation hole, 171 - negative electrode cover, 1711 - stress hole, 1712 - stepped groove, 172 - negative electrode post, 1721 - negative electrode post terminal, 1722 - extension section, 1723 - connection section, 1724 - limiting ring, 173 - seal, 1731 - washer, 1732 - rubber sealing ring, 1733 - horizontal section, 1734 - vertical section, 181 - welding hole, 211 - rubber plug, 212 - metal plug, 2121 - metal plug body, 2122 - limiting block. Detailed implementation manners

[0026] The following further describes the present utility model through specific implementation manners.

[0027] Refer to Figures 1 to 8 As shown, a high-performance supercapacitor includes a housing 11 with an internally formed installation cavity 111, a battery cell 12 disposed in the installation cavity 111, a positive current collector block 13 laser-welded to the bottom of the battery cell 12, a negative current collector block 14 laser-welded to the top of the battery cell 12, an upper cover 15 disposed at the upper end of the housing 11 for sealing the installation cavity 111, a positive electrode post 16 disposed on one side of the top surface of the upper cover 15, a negative electrode post assembly 17 disposed on the other side of the top surface of the upper cover 15 and connected to the negative current collector block 14, an adapter plate 18 laser-welded to the negative current collector block 25 and laser-welded to the lower end of the negative electrode post assembly 17, a positioning post 19 extending upward from the bottom of the installation cavity 111, a liquid injection hole 20 extending upward from the bottom of the housing 11 through the positioning post 19, and a sealing rubber plug assembly 21 for sealing the liquid injection hole 20.

[0028] The battery cell 12 is sequentially formed by laminating and winding a negative electrode sheet, an inner separator, a positive electrode sheet, and an outer separator, and an internally formed liquid injection channel 121 extending upward from its top for the positioning post 19 to be inserted therein, wherein the liquid injection hole 20 is connected to the liquid injection channel 121.

[0029] The positive current collector block 13 is formed with a slot 131 for the lower end of the battery cell 12 to be inserted therein, so that the upper end of the positive current collector block 13 wraps around the outer periphery of the lower end of the battery cell 12 to improve the vibration resistance of the battery cell 12, and at the same time is in interference fit with the installation cavity 11. After the installation is completed, the inner wall of the installation cavity 11 and the positive current collector block 13 are sealed by through-welding.

[0030] The negative current collector block 14 is formed with an annular boss 141 extending upward, and the inner diameter of the boss 141 is the same as the outer diameter of the adapter piece 18. After the adapter piece 18 is installed on the negative current collector block 14, the two are welded along the edge by laser welding. Using this method to replace the conventional use of a connecting bar as a connection improves the anti-vibration performance, reduces the contact resistance, and improves the large-current discharge capacity of the capacitor.

[0031] The upper cover 15, made of aluminum, has a surface diameter the same as the inner diameter of the outer shell 11, and a chamfer is provided at the reverse side edge for easy installation. Among them, the upper cover 15 is provided with a mounting hole 151 for mounting the negative terminal assembly 17; specifically, the positive terminal 16 is integrally formed with the upper cover 15.

[0032] The negative terminal assembly 17 includes a negative cover 171 connected to the mounting hole 151, a negative terminal 172 extending downward from the negative cover 171 and laser welded to the adapter piece 18, and a seal 173 disposed between the upper cover 15 and the negative cover 171. Among them, the negative cover 171 is threadedly connected to the mounting hole 151, and stress holes 1711 are provided on its surface for facilitating stress action; specifically, the negative cover 171 is made of a special ceramic or resin material with insulation and high strength.

[0033] The negative terminal 172 includes a negative terminal end 1721 at the upper end of the negative cover 171, an extension section 1722 extending downward from the bottom of the negative terminal 1721 for mounting the seal 173, and a connection section 1723 disposed at the lower end of the extension section 1722 and connected to the negative current collector block 14. Among them, a limit ring 1724 for restricting the installation position of the seal 173 is formed on the outer periphery of the upper end of the extension section 1722; specifically, a welding hole 181 for the lower end of the connection section 1723 to be embedded is provided on the adapter piece 18.

[0034] The seal 173 includes a washer 1731 sleeved on the negative terminal 172 and located in the negative cover 171, and a rubber sealing ring 1732 disposed at the lower end of the washer 1731 and between the negative cover 171 and the upper cover 15. Specifically, the rubber sealing ring 1732 is arranged in an I-shape, including two horizontal sections 1733 opposite to each other up and down and a vertical section 1734 connecting the two horizontal sections 1733, and the vertical section 1734 is attached to the inner wall of the mounting hole 151; among them, the diameter of the horizontal section 1733 is larger than the diameter of the washer 1731, the diameter of the washer 1731 is larger than the diameter of the limit ring 1724, and the negative cover 171 is formed with a stepped groove 1712 extending upward from its bottom for the washer 1731 and the upper horizontal section and the limit ring 1724 to be embedded.

[0035] The sealed rubber plug assembly 21 includes a rubber plug 211 sealed and fixed in the liquid injection hole 20 and a metal plug 212 for fixing the rubber plug 211. Specifically, the metal plug 212 is threadedly connected to the liquid injection hole 20, including a metal plug body 2121 that can be embedded in the liquid injection hole 20 at the lower end of the rubber plug 211 and a limiting block 2122 arranged on the outer periphery of the metal plug body 2121 and in contact connection with the bottom of the outer shell 11. Among them, a limiting groove 112 for the limiting block 2122 to be embedded is formed at the bottom of the outer shell 11.

[0036] Its preparation process specifically includes the following steps:

[0037] Step 1: Laser-weld the positive current collector block 13 and the negative current collector block 14 to the upper and lower ends of the battery cell 12 respectively, and then install the battery cell 12 in the installation cavity 111, so that the positioning post 19 is embedded in the liquid injection channel 121 to connect the liquid injection hole 20 with the liquid injection channel 121.

[0038] Step 2: Fix the negative pole column assembly 17 on the upper cover 15, and then connect the upper cover 15 to the upper end of the outer shell 11 to seal the installation cavity 111 to form a semi-finished capacitor.

[0039] Step 3: Transfer the semi-finished capacitor to an oven to remove water and dry the battery cell 12 inside the shell, and then inject the electrolyte into the liquid injection channel 121 along the liquid injection hole 20 to fully soak the battery cell 12.

[0040] Step 4: Seal the liquid injection hole 20 with the sealed rubber plug assembly 21, and then transfer it to an aging oven at 60 - 70 °C for aging treatment for 5 - 7 h.

[0041] Step 5: Transfer the semi-finished capacitor after aging treatment out of the aging oven, remove the sealed rubber plug assembly 21, then evacuate the electrolyte and waste gas in the installation cavity 111 through the liquid injection hole 20, re-inject the electrolyte, finally reinstall the sealed rubber plug assembly 21, and use laser welding to connect the limiting block 2122 of the metal plug 212 to the limiting groove 112 to seal the liquid injection hole 20 to obtain a high-performance supercapacitor.

[0042] In this application, by defining the structural composition of the capacitor, a large amount of laser welding is used for sealing between components, reducing the use area of rubber in sealing, forming a high-sealing structure and reducing the internal resistance. At the same time, the structural composition of the negative pole column 172 is defined as a new stress support point to avoid the rubber sealing ring 1732 from bearing physical stress impact while being used as a seal, improving the anti-vibration ability and sealing performance of the capacitor. In addition, a liquid injection hole 20 and a sealed rubber plug assembly 21 for sealing the liquid injection hole are arranged at the bottom of the outer shell 11. Through the cooperation between the two, the waste gas and electrolyte after the first charge and discharge high-temperature aging are replaced, reducing the internal air pressure of the supercapacitor while also improving the performance and service life of the capacitor.

[0043] As mentioned above, it is only the preferred embodiment of the present utility model, and thus the scope of implementation of the present utility model cannot be limited thereby. That is, equivalent changes and modifications made according to the scope of the patent application of the present utility model and the content of the specification should still fall within the scope covered by the patent of the present utility model.

Claims

1. A high-performance supercapacitor, characterized in that: It includes a housing with an internally formed installation cavity, a battery cell disposed in the installation cavity, a positive current collector block laser-welded to the bottom of the battery cell, a negative current collector block laser-welded to the top of the battery cell, an upper cover disposed at the upper end of the housing for sealing the installation cavity, a positive electrode post disposed on one side of the top surface of the upper cover, a negative electrode post assembly disposed on the other side of the top surface of the upper cover and connected to the negative current collector block, and a transition piece laser-welded to the negative current collector block and laser-welded to the lower end of the negative electrode post assembly. The upper cover is provided with an installation hole for installing the negative electrode post assembly, and the negative electrode post assembly is hermetically connected to the installation hole.

2. The high-performance supercapacitor according to claim 1, wherein: The negative electrode post assembly includes a negative electrode cover connected to the installation hole, a negative electrode post disposed on the negative electrode cover and extending downward to be laser-welded to the transition piece, and a sealing member disposed between the negative electrode post and the upper cover and the negative electrode cover.

3. A high-performance supercapacitor according to claim 2, characterized in that: The sealing member includes a washer sleeved on the negative electrode post and located in the negative electrode cover, and a rubber sealing ring disposed at the lower end of the washer and located between the negative electrode cover and the upper cover.

4. A high-performance supercapacitor according to claim 3, wherein: The rubber sealing ring is arranged in an I shape.

5. The high-performance supercapacitor according to claim 2, wherein: The negative electrode post includes a negative electrode post terminal located at the upper end of the negative electrode cover, an extension section extending downward from the bottom of the negative electrode terminal for installing the sealing member, and a connection section disposed at the lower end of the extension section and laser-welded to the transition piece. A limiting ring for restricting the installation position of the sealing member is formed on the outer periphery of the upper end of the extension section.

6. The high-performance supercapacitor according to claim 2, wherein: The negative electrode cover is threadedly connected to the installation hole.

7. A high-performance supercapacitor according to claim 2, characterized in that: It further includes a positioning post extending upward from the bottom of the installation cavity. The battery cell is formed with a liquid injection channel extending upward from its bottom, and the positioning post can be embedded in the liquid injection channel.

8. A high-performance supercapacitor according to claim 7, characterized in that: It further includes a liquid injection hole extending upward from the bottom of the housing, passing through the positioning post and communicating with the liquid injection channel, and a sealing rubber plug assembly for sealing the liquid injection hole.

9. A high-performance supercapacitor according to claim 8, characterized in that: The sealing rubber plug assembly includes a rubber plug hermetically fixed in the liquid injection hole and a metal plug for fixing the rubber plug. The metal plug is threadedly connected to the liquid injection hole.

10. A high-performance supercapacitor according to claim 9, characterized in that: The metal plug includes a metal plug body embedded in the liquid injection hole and located at the lower end of the rubber plug, and a limiting section disposed on the outer periphery of the metal plug body and in contact connection with the bottom of the housing.

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