Super capacitor seal welding optimization process

Abstract

The invention discloses a super capacitor seal welding optimization process. The process comprises the following steps: S1, selecting a full-tab aluminum pin made of an aluminum material and a cover plate liquid injection port made of an aluminum material; s2, laser continuous welding equipment is selected, and the welding track, the welding energy, the welding focal length and the welding speed of the laser continuous welding equipment are set; and S3, performing butt welding on the full-tab aluminum pin and the cover plate liquid injection port on the shell of the super capacitor by adopting laser continuous welding equipment, so that the full-tab aluminum pin and the cover plate liquid injection port are hermetically welded together, and a finished product of the super capacitor is obtained. The super capacitor seal welding optimization process disclosed by the invention is a super capacitor full tab aluminum pin and liquid injection port welding process and a rapid laser welding process, the welding time can be remarkably shortened, the welding speed can be improved, the welding seam performance is equivalent to or even higher than that of the original process, and the welding quality can be ensured.

Description

Technical Field

[0001] This invention relates to the field of supercapacitor technology, and in particular to an optimized sealing welding process for supercapacitors. This process is a novel continuous laser welding process for the aluminum pins of the supercapacitor's full-tab and the liquid injection port of the aluminum cover plate. Background Technology

[0002] Supercapacitors are high-power, environmentally friendly energy storage devices. Compared to lithium-ion batteries, their power density is one to two orders of magnitude higher, thus they have broad application prospects in many fields such as wind power generation, smart grids, power storage, rail transportation, and power equipment. Due to their high power density, light weight, fast charging, lack of memory effect, and long service life, supercapacitor batteries have become a key research and development area for most countries.

[0003] Supercapacitors employ a multi-tab structure, requiring welding technology during manufacturing to bond aluminum pins to the electrolyte inlet of the aluminum cover plate at one end (e.g., the top) of the supercapacitor casing. Multi-tab supercapacitors are environmentally friendly and highly efficient capacitor products; their manufacturing process necessitates the use of welding technology to laser-seal the electrolyte inlet of the capacitor's aluminum cover plate to the aluminum pins, forming a sealed container.

[0004] Traditional liquid injection port sealing welding technology has some problems, such as low welding position accuracy, poor welding strength, poor welding sealing, poor leakage rate, and poor weld explosion. However, the laser welding technology for sealing the liquid injection port of the aluminum cover plate and aluminum pin of the all-tab supercapacitor, which is currently commonly used, can effectively solve these problems and has become an important process for manufacturing high-quality all-tab supercapacitors. Its manufacturing quality and production capacity have become topics that most manufacturers need to study and improve.

[0005] Laser welding utilizes a laser beam to heat the surface of a workpiece with high energy density, causing the workpiece to melt and form a molten pool, which then cools to form a weld. Laser welding features high energy, high speed, precise welding position, high weld quality, and a small influence range around the weld, making it particularly suitable for fine machining of materials and high-precision position control.

[0006] Currently, the existing traditional sealing and welding technology for the liquid injection port and aluminum pin of the aluminum cover plate of all-tab supercapacitors has the following technical problems:

[0007] 1. Laser pulse welding results in severe weld spatter, and more seriously, electrolyte leakage, which can contaminate and damage the laser welding protective lens. To ensure welding quality, the laser welding protective lens needs to be replaced frequently. If the protective lens is not replaced in time or spatter is severe, the lens will exceed its tolerance to weld spatter, resulting in reduced energy in the weld pool and a weak weld.

[0008] 2. Spattered weld slag may splash to the outside, reducing the molten pool of the aluminum welded workpiece and increasing the risk of capacitor leakage.

[0009] 3. Laser pulse welding technology uses a xenon lamp to excite a YAG crystal rod to generate a laser beam for welding. Due to the limited lifespan of these two components (i.e., the xenon lamp and the YAG crystal rod), the stability of laser pulse welding is maintained for a relatively short time.

[0010] 4. Laser pulse welding involves heating the surface to be processed by laser radiation. The surface heat diffuses inward through heat conduction. By controlling the width, energy, peak power, and repetition frequency of the laser pulse, the workpiece is melted to form a specific molten pool. Controlling the welding laser in a pulsed manner results in a very slow welding speed, typically 0-10 mm / s, to achieve a certain welding quality, leading to low production efficiency.

[0011] 5. Laser pulse welding requires adjusting many welding parameters, and the adjustment and optimization are very difficult.

[0012] Therefore, the existing traditional aluminum cover plate liquid injection port and aluminum pin sealing welding technology for all-tab supercapacitors is an inefficient and high-risk process that is seriously mismatched with the production capacity and quality requirements of supercapacitor assembly. The only way to match production capacity and quality is to add welding equipment, continuously repair and replace equipment parts, or subsequently stop production intermittently, which seriously restricts the development of the supercapacitor industry.

[0013] Therefore, there is an urgent need to develop a technology that can solve the above-mentioned technical problems. Summary of the Invention

[0014] The purpose of this invention is to provide an optimized sealing and welding process for supercapacitors, addressing the technical deficiencies of existing technologies.

[0015] Therefore, the present invention provides an optimized sealing welding process for supercapacitors, comprising the following steps:

[0016] Step S1: Select aluminum full-diaphragm aluminum pins and aluminum cover plate injection port;

[0017] Step S2: Select the laser continuous welding equipment and set the welding trajectory, welding energy, welding focal length, and welding speed of the laser continuous welding equipment;

[0018] Step S3: Using laser continuous welding equipment, butt welding is performed on the aluminum pins of the full-tab and the liquid injection port of the cover plate on the supercapacitor housing, so that the aluminum pins of the full-tab and the liquid injection port of the cover plate are sealed together to obtain the finished supercapacitor.

[0019] As can be seen from the technical solutions provided by the present invention above, compared with the prior art, the present invention provides an optimized sealing welding process for supercapacitors. The design is scientific. It is a welding process for aluminum pins and liquid injection ports of supercapacitor full-tabs. It is a fast laser welding process that can significantly shorten the welding time, increase the welding speed, and the weld performance is comparable to or even higher than the original process. It can guarantee the welding quality and has significant practical significance. Attached Figure Description

[0020] Figure 1 A flowchart of an optimized sealing welding process for supercapacitors provided by this invention;

[0021] Figure 2 This is a schematic diagram comparing the welding strength of the process of this invention with that of the original process;

[0022] Figure 3 This is a schematic diagram comparing the welding speed of the process of this invention with that of the original process;

[0023] Figure 4 This is a schematic diagram comparing the pass rates of the process of this invention with those of the original process;

[0024] Figure 5 This is a schematic diagram comparing the service life of the protective lens between the process of this invention and the original process;

[0025] Figure 6 This is a schematic diagram comparing the maintenance costs of the process of this invention with those of the original process;

[0026] Figure 7 This is a diagram comparing the equipment procurement costs of the process of this invention with those of the original process. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] In the description of this patent, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this patent according to the specific circumstances.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0030] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0031] See Figures 1 to 7 This invention provides an optimized sealing welding process for supercapacitors, comprising the following steps:

[0032] Step S1: Select aluminum full-diaphragm aluminum pins and aluminum cover plate injection port;

[0033] Step S2: Select the laser continuous welding equipment and set the welding trajectory, welding energy, welding focal length, and welding speed of the laser continuous welding equipment;

[0034] Step S3: Using laser continuous welding equipment, butt welding is performed on the aluminum pins of the full-tab and the liquid injection port of the cover plate on the supercapacitor housing, so that the aluminum pins of the full-tab and the liquid injection port of the cover plate are sealed together to obtain the finished supercapacitor.

[0035] In this invention, in step S1, it should be noted that the supercapacitor uses a cover plate with an injection port made entirely of aluminum, and the sealing nail is made of aluminum.

[0036] In step S2, the laser continuous welding equipment is specifically a continuous welding laser, and the laser head of the operating table associated with the continuous welding laser adopts the galvanometer mode.

[0037] It should be noted that continuous welding lasers are a mature and widely used conventional device, and will not be elaborated upon here.

[0038] In step S2, a 500-2000W continuous welding laser is used, and the operating table is selected as a laser head three-axis linkage operating table; the loading and unloading are selected as needed using capacitor fixing fixtures or other methods.

[0039] In step S2, the welding trajectory includes any one of a straight welding trajectory, a dot matrix welding trajectory, and a circular welding trajectory.

[0040] It should be noted that the welding trajectory can be a straight line welding trajectory, a dot matrix welding trajectory, or a circular welding trajectory, depending on the welding requirements.

[0041] It should be noted that in this invention, the welding trajectory can be a single straight line, multiple straight lines, a dot matrix, or a circle.

[0042] In step S2, the total welding energy of the laser continuous welding equipment is 500-2000W;

[0043] In step S2, the welding energy of the laser continuous welding equipment is output in stages;

[0044] Furthermore, in step S2, the welding energy of the laser continuous welding equipment is output in the order of the first stage, the second stage, and the third stage;

[0045] The first stage is the rising stage: it is the stage where the welding energy gradually increases at the beginning of welding, and the duration of the first stage is a preset first duration (e.g., 2ms).

[0046] The second stage is the constant stage: during the welding process, the welding energy remains constant, and the duration of the second stage is the preset second duration;

[0047] The preset second duration (e.g., 6ms) is greater than the preset first duration;

[0048] The third stage is the descent stage: it is the stage where the welding energy gradually decreases before the welding is about to end. The duration of the third stage is the preset third duration (e.g., 1ms).

[0049] The preset third duration (e.g., 1ms) is shorter than the preset first duration (e.g., 2ms).

[0050] It should be noted that in step S2, the welding energy of the laser continuous welding equipment is set using total energy and segmented waveform energy. The laser continuous welding energy is 500-2000W, and the energy at the beginning of the waveform segmented energy rises to the maximum energy, with the energy input changing over time. In the rising phase: at the start of welding, the energy gradually increases, causing the weld pool to gradually form a constant phase. In the constant phase: during the welding process, the energy remains constant, and the weld pool steadily expands. In the falling phase: before the end of welding, the energy gradually decreases, causing the weld to solidify, avoiding excessive energy that could melt the workpiece, and preventing and eliminating the possibility of a deep pit formed by a sudden high-energy cutoff, thus reducing the probability of weld explosions in aluminum pins.

[0051] In step S2, the laser welding speed is 0-300 mm / s.

[0052] It should be noted that, for the present invention, the welding time is the welding time of the entire welding trajectory (e.g., a circular welding trajectory), which is adjusted by the welding wire (e.g., a circular welding wire) and the welding speed.

[0053] It should be noted that the welding speed can be adjusted according to the welding effect and welding energy to ensure good welding strength, good weld appearance, and no spatter.

[0054] In step S3, during butt welding, the overlap rate of the molten pools of adjacent laser spots ranges from 70% to 80%.

[0055] It should be noted that in step S3, butt welding is the main way to ensure sealing (such as container welds). It is necessary to ensure that the molten pools of adjacent laser spots completely overlap to eliminate weld gaps. The overlap rate is in the range of 70% to 80%.

[0056] In practice, the overlap rate η can be calculated directly using the ratio of the spacing to the spot diameter. The specific calculation formula is as follows:

[0057] Formula: η=[1-(S / D)]×100%;

[0058] In the formula above, D is the diameter of the fiber spot, and S is the center-to-center distance between adjacent laser spots.

[0059] In this invention, the laser overlap rate of the welding trajectory is calculated based on the diameter of the fiber optic weld joint. Due to the large energy fluctuations at the start and end points of continuous welding, the circular welding trajectory needs to be lengthened at the start and end positions. (The method for increasing the circular welding trajectory mainly depends on factors such as welding process parameters, welding speed, weld type, and weld joint form. To determine the specific increase length, adjustments need to be made based on the actual situation. In practice, a trial-and-error method is usually used to gradually adjust the length of the circular welding trajectory to achieve satisfactory welding quality.)

[0060] To better understand the technical solution of the present invention, the following specific embodiments will be used to illustrate the technical solution of the present invention.

[0061] Example

[0062] The optimized sealing welding process for supercapacitors provided by this invention is a welding process for the aluminum pins of the supercapacitor's full-tab and the liquid injection port of the aluminum cover plate, comprising the following steps.

[0063] First, select aluminum full-diaphragm aluminum pins and aluminum cover plate injection ports, with a diameter of 3.3mm for the sealing welding trajectory (circular welding trajectory) of the injection port;

[0064] Then, a 1500W continuous welding laser was selected, with fiber spot diameter D = 0.8mm and center-to-center spacing between adjacent spots S = 0.17mm;

[0065] Then, adjust the welding focal length of the continuous welding laser;

[0066] Then, the continuous welding laser is required to use butt welding to weld the aluminum pins of the full-pole lugs and the liquid injection port of the cover plate on the supercapacitor housing.

[0067] It should be noted that butt welding is the main method to ensure sealing (such as container welds). It is necessary to ensure that the molten pools of adjacent laser spots completely overlap to eliminate weld gaps. In this invention, the overlap rate is required to be 70% to 80%.

[0068] The laser overlap rate of the welding trajectory is calculated directly using the ratio of the laser spacing to the laser spot diameter (η), as shown in the following formula:

[0069] η = [1 - (S / D)] × 100%;

[0070] When the welding trajectory is circular, given that the fiber spot diameter D = 0.8 mm and the center-to-center distance between adjacent spots S = 0.17 mm, substituting into the formula:

[0071] eta=[1-(0.17 / 0.8)]×100%=(1-0.212)×100%=78.7%.

[0072] That is, the laser overlap rate of this process is 78.7%.

[0073] Then, adjust the total welding energy of the continuous welding laser to 1000W; output ratio: 80%.

[0074] Then, the welding waveform of the continuous welding laser is set, which can be divided into three energy output segments. The first segment, the rising stage, requires 45±5% of the total welding energy, but actually uses 47% of the total welding energy, with a laser welding speed of 50 mm / s and a duration of 0.5–1 ms. The second segment, the constant stage, also requires 45±5% of the total welding energy, but actually uses 47% of the total welding energy, with a laser welding speed of 50 mm / s and a duration of 1–2 ms. The third segment, the falling stage, requires 35±5% of the total welding energy, but actually uses 37% of the total welding energy, with a laser welding speed of 50 mm / s and a duration of 0.5–1 ms. A single continuous laser welding machine has a total of 8 welding stations, with a total welding time of 16–32 ms for all 8 welding sessions.

[0075] Then, the aluminum pins of the full-tab and the liquid injection port of the cover plate on the supercapacitor shell are welded by butt welding (the total energy output ratio, waveform and welding speed can be adjusted according to the welding strength, welding sealing and welding appearance) to obtain a supercapacitor with complete welding.

[0076] Comparative example:

[0077] The comparative example (original pulse welding process) specifically includes the following steps:

[0078] First, select aluminum full-diaphragm aluminum pins and aluminum cover plate injection ports, with a diameter of 3.3mm for the sealing welding trajectory (circular welding trajectory) of the injection port;

[0079] Then, a 500W pulsed laser was selected, with an fiber diameter D = 0.8mm and a center-to-center spacing of 0.17mm between adjacent laser spots;

[0080] Then, adjust the welding focal length;

[0081] Then, given that butt welding is the main form of ensuring sealing (such as container welds), it is necessary to ensure that the molten pools of adjacent laser spots completely overlap to eliminate weld gaps, with an overlap rate ranging from 70% to 80%.

[0082] The laser overlap rate of the welding trajectory is calculated directly using the ratio of the laser spacing to the laser spot diameter, as shown in the following formula:

[0083] η = [1 - (S / D)] × 100%; the welding trajectory is circular. Given that the fiber optic spot diameter D = 0.8 mm and the center-to-center distance between adjacent spots S = 0.17 mm, substituting into the formula:

[0084] eta=[1-(0.17 / 0.8)]×100%=(1-0.212)×100%=78.7%.

[0085] That is, the laser overlap rate of this process is 78.7%.

[0086] Then, adjust the welding energy to 4-6kW and the welding frequency to 10-20Hz;

[0087] Then, the pulse width welding waveform is set, and the energy is output in four segments in sequence. The first segment has an energy of 90-100% and a duration of 0.4-0.6ms; the second segment has an energy of 90-100% and a duration of 2-4ms; the third segment has an energy of 40-70% and a duration of 0.3-0.5ms; and the fourth segment has an energy of 40-70% and a duration of 1.0-1.5ms. The total pulse width time is 3.7-6.6ms. A single pulse laser welding machine has a total of 4 welding stations, and the total welding time for the 4 stations is 14.8-26.4ms.

[0088] Then, the laser is used to weld the aluminum pins of the all-pole lugs and the liquid injection port of the cover plate on the supercapacitor housing using a butt welding method (the total energy output ratio, waveform and welding speed can be adjusted according to the welding strength and welding appearance) to obtain a supercapacitor with complete welding.

[0089] See Figures 2 to 7As shown, the welding appearance, welding strength, welding time, service life of protective lens, maintenance cost and time of the process of the present invention are compared with those of the original process. The results are as follows: Compared with the original process, the welding appearance of the process of the present invention is smooth and there is no spatter.

[0090] like Figure 2 As shown, the welding strength of the process of the present invention is 10-25% higher than that of the original process, and the welding is more robust and reliable.

[0091] like Figure 3 As shown, compared with the original process, the welding speed of the process of the present invention is 10-20% shorter, and the welding capacity is increased by 1-3 times.

[0092] like Figure 4 As shown, the pass rate of the process of the present invention is 0.2-0.9% higher than that of the original process when comparing the pass rate.

[0093] like Figure 5 As shown, the process of this invention, compared with the original process, shows that the lifespan of the protective lens is 50-100 times longer with continuous welding than with pulse welding; continuous welding basically eliminates the need to replace the lens.

[0094] like Figure 6 As shown, comparing the maintenance costs of the present invention and the original process, with a 10-year scrapping period, the maintenance cost of continuous welding is basically the same, at 10,000 yuan per year, totaling 100,000 yuan over 10 years. The maintenance cost of pulse welding increases with age, reaching approximately 1.1 million yuan over 10 years. This mainly involves replacing xenon lamps, protective lenses, protection boards, control boards, and YAG rods; repairing charge / discharge boxes and optical fibers; and adjusting the optical path. The maintenance cost of continuous welding is 10% of that of pulse welding. Continuous welding requires very little maintenance time, while pulse welding involves more time for maintenance and spare parts replacement; the maintenance time for continuous welding is 1-5% of that for pulse welding.

[0095] like Figure 7 As shown, the comparison of equipment procurement costs and time between the process of the present invention and the original process shows that the imported laser for continuous welding is 2-3 times that of the laser for pulse welding. As the service life increases, the total cost of continuous welding is lower than that of pulse welding.

[0096] In summary, the optimized welding process for supercapacitor sealing provided by this invention is a welding process for aluminum pins on all tabs and the liquid injection port on the aluminum cover plate of a supercapacitor. Testing has shown that, based on the process of this invention, the overall welding time is 10%-20% of the original pulse welding process; the welding strength of the aluminum pins and the liquid injection port on the aluminum cover plate using the process of this invention is stronger than that of the original process, with no spatter, reducing the risk of short circuits and weak welds; testing has also shown that the weld qualification rate based on the process of this invention is higher than that of the original process, and the equipment maintenance time is significantly shorter than that of the original process, which has significant practical implications for production.

[0097] Compared with existing technologies, the optimized sealing and welding process for supercapacitors provided by this invention has the following beneficial technical effects:

[0098] 1. The continuous welding laser and operating table equipment of the present invention can ensure the welding production of aluminum pins and aluminum cover plate liquid injection ports.

[0099] 2. The present invention relates to a welding process for aluminum pins and liquid injection ports of aluminum cover plates for supercapacitors. The welding area can meet the requirement of weld line sealing overlap rate ≥70%~80%, and can also ensure that the overlapping part of the circular trajectory at both ends has a gradual change requirement, which facilitates the gradual change of energy.

[0100] 3. The present invention relates to a welding process for aluminum pins and liquid injection ports of aluminum cover plates for supercapacitors. The welding energy setting avoids excessive energy that could cause the workpiece to melt. The termination position is adjusted to a gradual form to avoid high energy instantaneous cutoff that could form a deep pit, causing the aluminum pins to explode and thus increasing the risk of capacitor leakage.

[0101] 4. The present invention relates to a welding process for aluminum pins and liquid injection ports of aluminum cover plates for supercapacitors, the overall welding speed of which is 10-20 times that of the original welding speed, greatly saving welding time.

[0102] 5. The present invention relates to a welding process for aluminum pins and liquid injection ports of aluminum cover plates for supercapacitors, which improves welding strength, reduces welding spatter, and reduces the risk of short circuits.

[0103] 6. The present invention relates to a welding process for aluminum pins and liquid injection ports of aluminum cover plates for supercapacitors, which can avoid frequent replacement of protective lenses and prevent weak welds caused by excessive welding slag on unreplaced or unprotected lenses.

[0104] 7. The present invention relates to a welding process for aluminum pins and liquid injection ports of aluminum cover plates for supercapacitors, which can save time spent on periodic laser optical path adjustment, xenon lamp replacement, and YAG rod maintenance.

[0105] In this invention, the laser continuous welding process has the following technical advantages compared to the traditional pulse welding process:

[0106] 1. Higher welding efficiency, suitable for large-scale continuous production. In this invention, the continuous laser acts on the workpiece with an uninterrupted energy flow, without relying on the "pulse interval time" (to avoid overheating or control heat input) as in pulse welding. Therefore, the welding speed is significantly faster, and it is especially suitable for long welds, continuous welds, or large-scale assembly line production.

[0107] 2. Improved weld continuity, enhanced sealing, and stronger structural integrity. In this invention, the stable energy output of the continuous laser can create uninterrupted, uniform, and continuous welds, avoiding problems such as discontinuous welds and localized lack of fusion that may occur in pulse welding due to improper control of laser spot overlap. This is particularly crucial for scenarios with high requirements for sealing and leak prevention.

[0108] 3. Deeper and more uniform weld penetration, suitable for medium-thick materials or high-strength joints. In this invention, the energy of the continuous laser accumulates continuously, allowing for more thorough penetration into the material and forming a deeper and more stable fusion zone. In contrast, pulse welding, due to energy interruptions, is easily affected by the pulse width and frequency, and the overall weld penetration is shallower (mostly suitable for 0.1-2mm thin plates).

[0109] 4. Higher process stability and simpler parameter control. For this invention, the core parameters for continuous welding only need to be controlled: "laser power, welding speed, and defocusing amount". Unlike pulse welding, there is no need to adjust complex parameters such as "pulse width, pulse frequency, and peak power", which reduces the risk of process fluctuations caused by parameter coupling.

[0110] 5. It exhibits superior adaptability to materials with high thermal conductivity and high reflectivity. Regarding this invention,

[0111] For materials with high thermal conductivity and high reflectivity, such as aluminum, copper, and magnesium alloys, the stable energy output of continuous lasers can continuously compensate for the rapid heat dissipation of the materials, avoiding the problems of "incomplete fusion and false welding" caused by "excessive heat dissipation due to energy interruption" in pulse welding.

[0112] 6. Reduce weld surface defects and lower post-processing costs. With this invention, the energy output of continuous welding is stable, the solidification process of the molten pool is more uniform, and it is less likely to produce "weld surface ripples, spatter, and porosity" that may occur during pulse welding (energy fluctuations during pulse switching can easily lead to instability of the molten pool).

[0113] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A supercapacitor seal weld optimization process, characterized by, The method comprises the following steps: Step S1, selecting an all-tab aluminum pin made of aluminum and a cover plate liquid injection port made of aluminum; Step S2, selecting a laser continuous welding device, and setting a welding track, a welding energy, a welding focal length and a welding speed of the laser continuous welding device; Step S3, using the laser continuous welding device to butt weld the all-tab aluminum pin and the cover plate liquid injection port on the super capacitor shell, so that the all-tab aluminum pin and the cover plate liquid injection port are sealed and welded together, and a finished super capacitor is obtained.

2. The ultracapacitor seal weld optimization process of claim 1, wherein, In step S2, the laser continuous welding device is specifically a continuous welding laser, and the operation table laser head matched with the continuous welding laser adopts a galvanometer mode.

3. The ultracapacitor seal weld optimization process of claim 1, wherein, In step S2, the welding track includes any one of a straight line welding track, a dot matrix welding track and a circular welding track.

4. The ultracapacitor seal weld optimization process of claim 1, wherein, In step S2, the total welding energy of the laser continuous welding device is 500-2000W.

5. The ultracapacitor seal weld optimization process of any one of claims 1 to 4, wherein, In step S2, the welding energy of the laser continuous welding device is output in stages.

6. The ultracapacitor seal weld optimization process of claim 5, wherein, In step S2, the welding energy of the laser continuous welding device is output in the order of a first stage, a second stage and a third stage; The first stage is a rising stage, that is, the welding energy gradually increases at the beginning of welding, and the duration of the first stage is a preset first duration; The second stage is a constant stage, that is, the welding energy remains constant during welding, and the duration of the second stage is a preset second duration; The third stage is a falling stage, that is, the welding energy gradually decreases before the end of welding, and the duration of the third stage is a preset third duration.

7. The ultracapacitor seal weld optimization process of claim 6, wherein, The preset second duration is greater than the preset first duration; The preset third duration is less than the preset first duration.

8. The ultracapacitor seal weld optimization process of any one of claims 1 to 4, wherein, In step S2, the laser welding speed is 0-300mm / s.

9. The ultracapacitor seal weld optimization process of any one of claims 1 to 4, wherein, In step S3, when butt welding, the overlap rate of the molten pools of adjacent laser spots is 70%-80%.

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