Preparation method of high-performance lead wire type supercapacitor

Abstract

The application discloses a preparation method of a high-performance lead type super capacitor, and the super capacitor comprises a shell, an electric core arranged in the shell, two leads respectively connected with the electric core, and a sealing rubber plug arranged in the shell and used for sealing the electric core. The lead comprises a connecting tongue connected with the electric core, a connecting column connected with the connecting tongue and located above the electric core, a lead column connected with the upper end of the connecting column and extending upwards to the outside of the shell, and a liquid inlet hole extending downwards from the upper end of the lead column to the connecting column. A plurality of connecting holes in communication with the liquid inlet hole are formed at the connecting position of the connecting tongue and the connecting column. The application limits the mechanism of the lead, arranges the liquid inlet hole in the lead, and arranges the connecting hole connected with the liquid inlet hole at the connecting position of the connecting tongue and the connecting column. After the capacitor is assembled, liquid injection is performed, so that the electrolyte is prevented from seeping from the shell to the gap between the sealing rubber plug and the inner wall of the shell in the assembling process, and the sealing performance of the capacitor is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of supercapacitor preparation, and particularly relates to a preparation method of a high-performance lead-wire type supercapacitor. BACKGROUND

[0002] As a new high-level energy storage device, the supercapacitor has the high power characteristics of the traditional capacitor and the high energy characteristics of the battery. Due to its unique high specific power, large current discharge capacity, ultra-low temperature characteristics, high reliability and green environmental protection, the supercapacitor is widely used and developed in many fields such as electric power, transportation, communication, energy and aviation.

[0003] In the existing lead-wire type supercapacitor, the diameter of the electric core is usually set to be smaller than the inner diameter of the shell. One is to increase the blank space in the shell to reduce the internal pressure of the capacitor to improve the performance of the capacitor. However, the premise of more free space is to increase the gap between the electric core and the shell. Due to the small size of the lead-wire type supercapacitor, it is not suitable to use the anti-vibration waist to the electric core position shell. Therefore, the electric core is usually in a suspended state in the shell. When the capacitor is used in a durable vibration working condition, the stress of the electric core shaking is transferred from the guide pin to the contact position of the sealing rubber plug and the aluminum stem of the guide pin. Long-term vibration causes the sealing property of the position to decrease, resulting in leakage of the capacitor.

[0004] At the same time, in the existing lead-wire type supercapacitor, the electric core, the sealing rubber plug and the shell are assembled and packaged after the electrolyte is injected or soaked. This process will cause the electrolyte to be extruded and seep out to the contact position of the sealing rubber plug and the inner wall of the shell and the R angle of the sealing position. The electrolyte in the gap between the sealing rubber plug and the shell cannot be cleaned by one-time cleaning. In the subsequent use process, the electrolyte will still slowly seep out, which affects the appearance of the capacitor and exists the risk of reducing the sealing property. SUMMARY

[0005] The purpose of the application is to overcome the shortcomings of the prior art and provide a preparation method of a high-performance lead-wire type supercapacitor.

[0006] The application adopts the following technical scheme:

[0007] A preparation method of a high-performance lead-wire type supercapacitor, the supercapacitor comprising a shell, an electric core arranged in the shell, two lead wires respectively connected with the electric core and a sealing rubber plug arranged in the shell for sealing the electric core, the lead wire comprising a connecting tongue connected with the electric core, a connecting column above the electric core connected with the connecting tongue, a lead wire column extending upwards to the outside of the shell connected with the upper end of the connecting column and a liquid inlet hole extending downwards from the upper end of the lead wire column to the connecting column, a plurality of connecting holes in communication with the liquid inlet hole are formed at the connecting position of the connecting tongue and the connecting column.

[0008] The preparation method specifically comprises the following steps:

[0009] Step 1, lead wire forming;

[0010] Step 2, capacitor forming: after drying the electric core, assembling with the sealing rubber plug and the shell, injecting the electrolyte from the liquid inlet hole into the electric core through the connecting hole, and applying high temperature to the upper end of the lead wire column to melt and seal the upper end of the lead wire column;

[0011] Step 3, charging and aging the capacitor, then cutting off the upper end of the lead wire column, releasing the impurity gas generated in the capacitor due to the first high-temperature aging, and then applying high temperature to the root position of the lead wire column close to the connecting column to melt and seal the root position to obtain the super capacitor.

[0012] Further, in step 2, the high temperature applied to the upper end of the lead wire column is 250-270℃, and the time is 3-5s.

[0013] Further, in step 1, the specific operation of lead wire forming is as follows: splicing the connecting column and the lead wire column, then inserting the metal fixing column into the liquid inlet hole, then soldering the connecting column and the lead wire column, then taking out the metal fixing column, then using electroplating process to coat copper and tin on the inner and outer walls of the lead wire column, then inserting a metal column that does not stick to tin into the liquid inlet hole, using capillary action to infiltrate the molten solder to the inner wall of the lead wire column, and then taking out the metal column to obtain the lead wire.

[0014] Further, in step 3, the high temperature applied to the root of the lead wire column is 250-270℃, and the time is 3-5s.

[0015] Further, the super capacitor further comprises a plurality of positioning grooves circumferentially distributed on the outer circumferential inward recess of the shell.

[0016] Further, the upper end of the connecting tongue extends into the connecting column connected with the inner wall of the liquid inlet hole, and the connecting hole is obliquely extended from the lower end of the connecting column to the outside of the connecting column.

[0017] Further, the connecting tongue is in strip-shaped arrangement.

[0018] Further, the connecting tongue is integrally formed with the connecting column.

[0019] Further, the diameter of the connecting column is greater than the diameter of the lead wire column.

[0020] Further, the outer periphery of the lower end of the lead wire column is provided with a brazing material layer connected with the upper end of the connecting column, and the upper end of the brazing material layer is formed with a chamfered surface, and the lower end diameter is consistent with the diameter of the connecting column.

[0021] Compared with the prior art, the beneficial effects of the application are: by limiting the mechanism of the lead, the liquid inlet hole is arranged in the lead, and the connecting hole connected with the liquid inlet hole is arranged at the connection between the connecting tongue and the connecting column, after the capacitor is assembled, liquid injection is carried out, the electrolyte is prevented from seeping from the inside of the shell to the gap between the sealing rubber plug and the inner wall of the shell in the assembling process, the sealing property of the capacitor is improved, at the same time, the solder is fused and sealed by local high-temperature heating at the end of the lead column, the foot is cut after aging, when the inner wall of the capacitor is first aged, the impurity gas generated by the reaction between the oxygen-containing functional groups on the electrode surface and the trace water in the electrolyte under high voltage is released, the internal gas pressure of the capacitor is reduced, the electrode hole structure collapse and blockage caused by gas particles are inhibited, the accessibility of ions to the hole is improved, the internal resistance is reduced, and the service life of the super capacitor is improved.

[0022] By arranging a plurality of inwardly recessed positioning grooves on the outer peripheral surface of the shell, the insertion and fixation of the battery cell are facilitated, and the anti-vibration performance of the prepared super capacitor is improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] Fig. 1 It is a structural schematic diagram of a super capacitor;

[0024] Fig. 2 It is a structural sectional view of a super capacitor;

[0025] Fig. 3 It is a structural schematic diagram of a lead;

[0026] Fig. 4 It is a structural sectional view of a lead;

[0027] In the figure, 1 is a shell, 2 is a battery cell, 3 is a lead, 4 is a sealing rubber plug, 5 is a positioning groove, 21 is a liquid injection channel, 31 is a connecting tongue, 32 is a connecting column, 33 is a lead column, 34 is a liquid inlet hole, 35 is a connecting hole, 36 is a brazing material layer, and 37 is a chamfered surface. DETAILED DESCRIPTION

[0028] The application will be further described below through specific embodiments.

[0029] Referring to Figs. 1 to 4 As shown in the figure, a high-performance lead type super capacitor includes a shell 1, a battery cell 2 arranged in the shell 1, two leads 3 connected with the battery cell 2 respectively, a sealing rubber plug 4 arranged in the shell 1 for sealing the battery cell 2, and a plurality of positioning grooves 5 distributed in the circumference of the shell 1 and recessed inwardly, wherein the corners of the contact surface of the positioning grooves 5 and the battery cell 2 are designed as smooth arcs to avoid damage to the battery cell 2 when it is inserted into the shell; specifically, the two leads 3 are used as positive and negative leads respectively.

[0030] The electric core 2 is formed by laminating and rolling a negative electrode sheet, an inner diaphragm, a positive electrode sheet and an outer diaphragm in sequence, and has a liquid injection channel 21 extending downward from the top thereof, wherein two lead wires 3 used as positive and negative electrode lead wires are connected to the positive and negative electrode sheets, respectively.

[0031] The lead wire 3 comprises a connecting tongue 31 connected to the electric core 2, a connecting column 32 connected to the connecting tongue 31 above the electric core 2, a lead wire column 33 extending upward from the upper end of the connecting column 32 to the outside of the shell 1, and a liquid inlet hole 34 extending downward from the upper end of the lead wire column 33 to the connecting column 32, wherein a plurality of connecting holes 35 are formed in the connecting column 32 and communicate with the liquid inlet hole 34, and electrolyte is injected into the electric core 2 through the liquid inlet hole 34 and the connecting holes 35 during liquid injection.

[0032] The lead wire column 33 is made of a hollow iron or steel column, wherein the diameter of the connecting column 32 is greater than the diameter of the lead wire column 33, and a brazing filler layer 36 is provided on the outer periphery of the lower end of the lead wire column 33 and connected to the upper end of the connecting column 32; specifically, a chamfered surface 37 is formed on the upper end of the brazing filler layer 36, and the diameter of the lower end of the brazing filler layer 36 is the same as that of the connecting column 32.

[0033] The connecting tongue 31 is in the form of a strip and extends into the connecting column 32 and is connected to the inner wall of the liquid inlet hole 34, wherein the connecting tongue 31 is integrally formed with the connecting column 32, and the connecting holes 35 extend obliquely inward from the outer side surface of the lower end of the connecting column 32.

[0034] The preparation method specifically comprises the following steps:

[0035] Step 1: lead wire forming: splice the connecting column 32 and the lead wire column 33, then insert a metal fixing column into the liquid inlet hole 34, and then braze the connecting column 32 and the lead wire column 33, take out the metal fixing column, and then use an electroplating process to coat copper and tin on the inner and outer walls of the lead wire column 33; then insert a metal column that does not adhere to tin and has a diameter smaller than that of the liquid inlet hole 34 into the liquid inlet hole 34, and use capillary action to infiltrate molten solder into the inner wall of the lead wire column 33, and then take out the metal column to obtain the lead wire;

[0036] Step 2: capacitor forming: prepare the electric core 2 according to the existing preparation method of the electric core 2, dry the electric core 2, and then assemble the electric core 2, the sealing rubber plug 4 and the shell, and then inject electrolyte from the liquid inlet hole 34 into the electric core 2, and then apply high temperature of 250-270℃ to the upper end of the lead wire column 33 for 3-5s to melt and seal the upper end of the lead wire column 33;

[0037] Step 3, charging the capacitor at 60-70℃ for 5-7h, then cutting off the end of the lead post 33, releasing the impurity gas in the capacitor due to the first high temperature aging, then applying high temperature of 250-270℃ to the root of the lead post 33 close to the connecting post 33 for 3-5s, so that the root position is fused to form a seal, so as to obtain a super capacitor.

[0038] The application sets the liquid inlet hole 34 in the lead 3 and the connecting hole 35 connected with the liquid inlet hole 34 at the connection between the connecting tongue 31 and the connecting post 32 by limiting the mechanism of the lead, and after the capacitor is assembled, the liquid injection is carried out, which avoids the electrolyte from extending from the inside of the shell 1 to the gap between the sealing rubber plug 4 and the inner wall of the shell 1 in the assembly process, improves the sealing performance of the capacitor, at the same time, the solder is fused and sealed by local high temperature heating at the end of the lead post 33, the foot is cut off after aging, so that the impurity gas generated by the reaction of the oxygen-containing functional group on the electrode surface and the trace water in the electrolyte under high voltage is released, the internal gas pressure of the capacitor is reduced, the electrode hole structure collapse and blockage caused by gas particles are inhibited, the accessibility of ions to the hole is improved, the internal resistance is reduced, and the service life of the super capacitor is improved.

[0039] The above is only a preferred embodiment of the application, and therefore cannot limit the scope of the application, that is, equivalent changes and modifications made according to the patent range and content of the specification of the application should still be within the scope of the application.

Claims

1. A method of making a high performance lead-type supercapacitor, characterized by: The super capacitor comprises a shell, an electric core arranged in the shell, two lead wires respectively connected with the electric core, and a sealing rubber plug arranged in the shell for sealing the electric core. The preparation method specifically comprises the following steps: Step 1, lead wire forming; Step 2, capacitor forming: after drying the electric core, assembling the sealing rubber plug and the shell, injecting the electrolyte from the liquid inlet hole into the electric core, and then applying high temperature to the upper end of the lead wire column to melt and seal the upper end of the lead wire column; Step 3, charging and aging the capacitor, then cutting off the melted section of the upper end of the lead wire column, releasing the impurity gas generated in the capacitor due to the first high-temperature aging, and then applying high temperature to the root position of the lead wire column close to the connecting column to melt and seal the root position, so as to obtain the super capacitor.

2. The method for preparing a high-performance lead-type supercapacitor according to claim 1, characterized in that: In step 2, the high temperature applied to the upper end of the lead wire column is 250-270°C, and the time is 3-5s.

3. The method for preparing a high-performance lead-type supercapacitor according to claim 1, wherein: In step 1, the specific operation of lead wire forming is as follows: the connecting column and the lead wire column are spliced, then a metal fixing column is inserted into the liquid inlet hole, the connecting column and the lead wire column are brazed, then the metal fixing column is taken out, and then the inner and outer walls of the lead wire column are plated with copper and tin by using electroplating process; then a metal column that does not stick to tin is inserted into the liquid inlet hole, and the molten solder is infiltrated into the inner wall of the lead wire column by using capillary action, and after cooling, the metal column is taken out to obtain the lead wire.

4. The method for preparing a high-performance lead-type supercapacitor according to claim 1, wherein: In step 3, the high temperature applied to the root of the lead wire column is 250-270°C, and the time is 3-5s.

5. The method for preparing a high-performance lead-type supercapacitor according to claim 1, wherein: The super capacitor further comprises a plurality of positioning grooves circumferentially distributed on the outer periphery of the shell and inwardly recessed.

6. The method for preparing a high-performance lead-type supercapacitor according to claim 1, wherein: The upper end of the connecting tongue extends into the connecting column and connects with the inner wall of the liquid inlet hole, and the connecting hole extends from the outer side of the lower end of the connecting column and extends inwardly.

7. The method for preparing a high-performance lead-type supercapacitor according to claim 1, characterized in that: The connecting tongue is in strip shape.

8. The method for preparing a high-performance lead-type supercapacitor according to claim 1, characterized in that: The connecting tongue and the connecting column are integrally formed.

9. The method for preparing a high-performance lead-type supercapacitor according to claim 1, characterized in that: The diameter of the connecting column is greater than that of the lead wire column.

10. The method for preparing a high-performance lead-type supercapacitor according to claim 1, characterized in that: The outer periphery of the lower end of the lead wire column is provided with a brazing material layer connected with the upper end of the connecting column, and the upper end of the brazing material layer is provided with a chamfered surface, and the lower end diameter is consistent with the diameter of the connecting column.

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