Low-internal-resistance lead-type super capacitor

Abstract

The utility model relates to a low-internal-resistance lead-type super capacitor, which comprises a shell, a battery cell arranged in the shell, two leads respectively connected with the battery cell, and a sealing rubber plug arranged in the shell and used for sealing the battery cell, the lead comprises a connecting tongue connected with the battery cell, a connecting column connected with the connecting tongue and located above the battery cell, a lead column connected with the upper end of the connecting column and extending upwards out of the shell, and a liquid inlet hole extending downwards into the connecting column from the upper end of the lead column, and a plurality of connecting holes communicated with the liquid inlet hole are formed in the joint of the connecting tongue and the connecting column; through a mechanism for limiting the lead, the liquid inlet hole is formed in the lead, the connecting hole connected with the liquid inlet hole is formed in the connecting position of the connecting tongue and the connecting column, and liquid injection is performed after the capacitor is assembled, so that electrolyte is prevented from seeping into a gap between the sealing rubber plug and the inner wall of the shell from the interior of the shell in the assembling process, and the assembling quality of the capacitor is improved. And the sealing performance of the capacitor is improved.

Description

Technical Field

[0001] The utility model belongs to the field of supercapacitor preparation, and particularly relates to a low internal resistance lead type supercapacitor. Background Technique

[0002] As a new type of advanced energy storage device, the supercapacitor has both 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 used and developed in many fields such as electric power, transportation, communication, energy, and aviation.

[0003] For the existing lead type supercapacitors, during assembly, the diameter of the battery core is usually set smaller than the inner diameter of the outer shell. One reason is to increase the blank space inside the shell to reduce the internal air pressure of the capacitor and improve the performance of the capacitor. However, the premise of having more spare space is to increase the gap between the battery core and the outer shell. Due to the small volume of the lead type supercapacitor, it is not suitable to perform anti-vibration waist shrinking on the outer shell of the battery core position. Therefore, the battery core is usually in a suspended state inside the outer shell. When the capacitor is used under the working condition of durable vibration, the stress of the shaking battery core is transferred from the lead pins to the contact position between the sealing rubber plug and the aluminum stem of the lead pins. Long-term vibration reduces the sealing performance at this position, resulting in capacitor leakage.

[0004] At the same time, for the existing lead type supercapacitors, after injecting or soaking the electrolyte, the battery core, the sealing rubber plug, and the outer shell are assembled and sealed. This process will cause the electrolyte to be squeezed out to the contact position between the side of the sealing rubber plug and the inner wall of the outer shell and the R corner at the sealing position. Due to capillary action, the electrolyte adhering to the gap between the sealing rubber plug and the outer shell cannot be cleaned up through a single cleaning. During subsequent use, the electrolyte will still slowly seep out, affecting the appearance of the capacitor and posing a hidden danger of reduced sealing performance. Content of the Utility Model

[0005] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a low internal resistance lead type supercapacitor.

[0006] The utility model adopts the following technical scheme:

[0007] A low internal resistance lead type supercapacitor, comprising an outer shell, a battery core arranged in the outer shell, two lead wires respectively connected to the battery core, and a sealing rubber plug arranged in the outer shell for sealing the battery core. The lead wire includes a connecting tongue connected to the battery core, a connecting column connected to the connecting tongue and located above the battery core, a lead wire column connected to the upper end of the connecting column and extending upward to the outside of the outer shell, and a liquid inlet hole extending downward from the upper end of the lead wire column to the connecting column. A plurality of connecting holes communicating with the liquid inlet hole are formed at the connection between the connecting tongue and the connecting column.

[0008] Further, the upper end of the connecting tongue extends into the connecting column and is connected to the inner wall of the liquid inlet hole, and the connecting hole extends obliquely inward from the outer side surface of the lower end of the connecting column.

[0009] Further, the connecting tongue is strip-shaped.

[0010] Further, the connecting tongue and the connecting column are integrally formed.

[0011] Further, it further includes a plurality of positioning grooves that are circumferentially distributed and recessed inward on the outer periphery of the outer shell.

[0012] Further, the diameter of the connecting column is greater than the diameter of the lead column.

[0013] Further, a brazing solder layer connected to the upper end of the connecting column is provided on the outer periphery of the lower end of the lead column.

[0014] Further, a chamfered surface is formed at the upper end of the brazing solder layer, and the diameter of the lower end is the same as the diameter of the connecting column.

[0015] Further, the battery cell is formed with a liquid injection channel extending downward from its top.

[0016] As can be seen from the above description of the present invention, compared with the prior art, the beneficial effects of the present invention are as follows: By defining the mechanism of the lead, a liquid inlet hole is provided in the lead, and a connecting hole connected to the liquid inlet hole is provided at the connection between the connecting tongue and the connecting column. After the capacitor is assembled, liquid injection is carried out, avoiding the leakage of the electrolyte from the inside of the outer shell to the gap between the sealing rubber plug and the inner wall of the outer shell during the assembly process, improving the sealing performance of the capacitor. At the same time, by locally heating the end of the lead column at a high temperature to melt and seal the solder, and trimming the feet after aging, when the inner wall of the capacitor is aged for the first time, the impurity gas generated by the reaction of the oxygen-containing functional groups on the electrode surface with the trace water in the electrolyte under high voltage can be released, reducing the internal air pressure of the capacitor while suppressing the collapse and blockage of the electrode pore structure caused by gas particles, improving the accessibility of ions to the pores, reducing the internal resistance, and increasing the service life of the supercapacitor;

[0017] By providing a plurality of positioning grooves that are recessed inward on the outer peripheral surface of the outer shell, it is convenient to insert and fix the battery cell, improving the anti-vibration performance of the prepared supercapacitor BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of a supercapacitor;

[0019] Figure 2 It is a structural cross-sectional view of a supercapacitor;

[0020] Figure 3 It is a schematic structural diagram of a lead;

[0021] Figure 4 Structural sectional view of the lead

[0022] In the figure, 1 - outer shell, 2 - battery cell, 3 - lead, 4 - sealing rubber plug, 5 - positioning groove, 21 - liquid injection channel, 31 - connecting tongue, 32 - connecting column, 33 - lead column, 34 - liquid inlet hole, 35 - connecting hole, 36 - brazing solder layer, 37 - chamfered surface. Specific embodiments

[0023] The present utility model will be further described below through specific embodiments.

[0024] Referring to Figures 1 to 4 As shown, a low - internal - resistance lead - type supercapacitor includes an outer shell 1, a battery cell 2 disposed in the outer shell 1, two leads 3 respectively connected to the battery cell 2, a sealing rubber plug 4 disposed in the outer shell 1 for sealing the battery cell 2, and a plurality of positioning grooves 5 that are circumferentially distributed and recessed inward on the outer periphery of the outer shell 1. Among them, the corners of the contact surface between the positioning groove 5 and the battery cell 2 are all designed with smooth arcs to prevent the battery cell 2 from being damaged when inserted into the shell; specifically, the two leads 3 are respectively used as the positive - lead and the negative - lead.

[0025] The battery cell 2 is formed by laminating and winding a negative electrode sheet, an inner separator, a positive electrode sheet, and an outer separator in sequence, and a liquid injection channel 21 extending downward from its top is formed inside. Among them, the two leads 3 respectively used as the positive - lead and the negative - lead are respectively connected to the positive electrode sheet or the negative electrode sheet.

[0026] The lead 3 includes a connecting tongue 31 connected to the battery cell 2, a connecting column 32 connected to the connecting tongue 31 and located above the battery cell 2, a lead column 33 connected to the upper end of the connecting column 32 and extending upward outside the outer shell 1, and a liquid inlet hole 34 extending downward from the upper end of the lead column 33 to the connecting column 32. Among them, a plurality of connecting holes 35 communicating with the liquid inlet hole 34 are formed at the connection between the connecting tongue 31 and the connecting column 32. When injecting liquid, the electrolyte is injected through the liquid inlet hole 34 and then flows downward through the connecting holes 35 to soak the battery cell.

[0027] The lead column 33 is made of a hollow iron or steel column. Among them, the diameter of the connecting column 32 is larger than the diameter of the lead column 33, and a brazing solder layer 36 connecting the upper end of the connecting column 32 is disposed on the outer periphery of the lower end of the lead column 33; specifically, a chamfered surface 37 is formed at the upper end of the brazing solder layer 36, and the diameter of its lower end is the same as the diameter of the connecting column 32.

[0028] The connecting tongue 31 is strip - shaped, and its upper end extends into the connecting column 32 and is connected to the inner wall of the liquid inlet hole 34. Among them, the connecting tongue 31 and the connecting column 32 are integrally formed. Specifically, the connecting holes 35 extend obliquely inward from the outer side surface of the lower end of the connecting column 32.

[0029] Preparation method, specifically including the following steps:

[0030] Step 1, lead forming: Splice the connecting column 32 and the lead column 33, then insert the metal fixing column into the liquid inlet hole 34. After brazing the connection between the connecting column 32 and the lead column 33, take out the metal fixing column, and then use the electroplating process to copper-plate and tin-plate the inner and outer walls of the lead column 33. Then insert a metal column that does not stick 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 the molten solder into the inner wall of the lead column 33. After cooling, take out the metal column to obtain the lead;

[0031] Step 2, capacitor forming: Prepare the battery cell 2 according to the existing preparation method of the battery cell 2 and dry the battery cell 2. Then, after assembling it with the sealing rubber plug 4 and the outer shell through rubber penetration, inject the electrolyte from the liquid inlet hole 34, and let it flow into the interior of the battery cell 2 through the connection hole 35. Then apply a high temperature of 250 - 270 °C to the upper end of the lead column 33 for 3 - 5 s to melt and weld the upper end part of the lead column 33 to form a seal;

[0032] Step 3, charge and age the capacitor at 60 - 70 °C for 5 - 7 h. Then cut off the welded section at the upper end of the lead column 33. After releasing the impurity gas generated inside the capacitor due to the first high-temperature aging, apply a high temperature of 250 - 270 °C to the root position of the lead column 33 close to the connecting column 33 for 3 - 5 s to melt and weld the root position to form a seal, so as to obtain a supercapacitor.

[0033] In this application, by defining the structure of the lead, a liquid inlet hole 34 is provided in the lead 3, and a connection hole 35 connected to the liquid inlet hole 34 is provided at the connection between the connection tongue 31 and the connecting column 32. After the capacitor is assembled, liquid injection is carried out, which avoids the electrolyte from extending from inside the outer shell 1 to the gap between the sealing rubber plug 4 and the inner wall of the outer shell 1 during the assembly process, improving the sealing performance of the capacitor. At the same time, by locally heating the end of the lead column 33 at a high temperature to melt and weld the solder for sealing, and cutting the feet after aging, when the inner wall of the capacitor is aged for the first time, the impurity gas generated by the reaction of the oxygen-containing functional groups on the electrode surface with the trace water in the electrolyte under high voltage can be released. While reducing the internal air pressure of the capacitor, it inhibits the collapse and blockage of the electrode pore structure caused by gas particles, improves the accessibility of ions to the pores, reduces the internal resistance, and increases the service life of the supercapacitor.

[0034] The above is only the preferred embodiment of the present invention, so the scope of implementation of the present invention cannot be limited thereby. That is, equivalent changes and modifications made according to the scope of the patent application of the present invention and the content of the specification should still fall within the scope covered by the patent of the present invention.

Claims

1. A lead type supercapacitor with low internal resistance, comprising a housing, an electric core disposed in the housing, two leads respectively connected to the electric core, and a sealing rubber plug disposed in the housing for sealing the electric core, characterized in that: The lead includes a connection tongue connected to the battery cell, a connection post connected to the connection tongue and located above the battery cell, a lead post connected to the upper end of the connection post and extending upward outside the housing, and a liquid inlet hole extending downward from the upper end of the lead post into the connection post. A plurality of connection holes communicating with the liquid inlet hole are formed at the connection between the connection tongue and the connection post.

2. The low internal resistance lead type supercapacitor according to claim 1, characterized in that: The upper end of the connection tongue extends into the connection post and is connected to the inner wall of the liquid inlet hole. The connection holes are arranged to extend obliquely inward from the outer side surface of the lower end of the connection post.

3. A low internal resistance lead type supercapacitor according to claim 1, characterized in that: The connection tongue is arranged in a strip shape.

4. A low internal resistance lead type supercapacitor according to claim 1, characterized in that: The connection tongue and the connection post are integrally formed.

5. A low internal resistance lead type supercapacitor according to claim 1, characterized in that: It further includes a plurality of positioning grooves that are circumferentially distributed and recessed inward on the outer periphery of the housing.

6. The low internal resistance lead type supercapacitor according to claim 1, characterized in that: The diameter of the connection post is larger than the diameter of the lead post.

7. The low internal resistance lead type supercapacitor according to claim 6, characterized in that: A brazing solder layer connected to the upper end of the connection post is arranged on the outer periphery of the lower end of the lead post.

8. The low internal resistance lead type supercapacitor according to claim 7, characterized in that: A chamfered surface is formed at the upper end of the brazing solder layer, and the diameter of the lower end is the same as the diameter of the connection post.

9. A low internal resistance lead type supercapacitor according to claim 1, characterized in that: The battery cell is formed with a liquid injection channel extending downward from its top.

Images