A high-efficiency lamination device for laminated aluminum capacitors

Abstract

The application discloses a laminated aluminum capacitor high-efficiency lamination device, which comprises a lamination mechanism and a lead frame overturning mechanism; the lamination mechanism is provided with one set or two sets, and the lamination mechanism comprises a capacitor process strip die-cutting device and a lead frame multi-station moving rail. The pipeline operation mode of the application has high operation speed. The lamination operation of multiple foils can be carried out at a time, and the lamination device is high in efficiency and low in cost. The deformation of the lead frame caused by high temperature during high-speed welding can be prevented. The relative error of the lamination position caused by the positioning error of the lead frame on the lead frame multi-station moving rail can be corrected, so that the position precision of the lamination operation of the foils is further improved.

Description

Technical Field

[0001] This invention relates to a high-efficiency stacking device for multilayer aluminum capacitors. Background Technology

[0002] Multilayer aluminum capacitors are a type of solid-state aluminum electrolytic capacitor that can replace expensive tantalum capacitors in some applications. Internally, a multilayer aluminum capacitor consists of multiple capacitor foils stacked together. The aluminum foil ends serve as the anode electrodes, welded to the positive terminal of the electrode leads. The silver electrodes of the capacitor foils serve as the negative electrodes, bonded layer by layer with silver paste to the negative terminal of the electrode leads. The manufacturing process includes aluminum foil formation, slitting, process strip stacking, impregnation polymerization, carbon and silver paste coating, stacking and welding, and resin molding. Among these processes, the stacking and welding step is particularly challenging to improve efficiency, requires high precision, and is costly to implement.

[0003] Existing technology involves cutting capacitor foil sheets one by one from the process strip after the aluminum foil on the process strip has been processed. These sheets are then picked up one by one by a turret suction head and transferred from the turret to a silver paste coating station. After the negative electrode area at the bottom of the capacitor foil is coated with silver paste, it is transferred to a vision correction station. After obtaining position information, it is transferred to a capacitor foil stacking station. This station has a lead frame with multiple stacking electrodes that can accept capacitor foil sheets for stacking, bonding, and welding. Each capacitor stacking electrode contains a negative electrode area and a positive electrode area. After the capacitor foil is placed on the stacking electrode, the silver paste-coated negative electrode area is bonded to the negative electrode area of ​​the stacking electrode, and the positive electrode area of ​​the capacitor foil is positioned on the positive electrode area of ​​the stacking location. Subsequently, it is welded to the positive electrode area of ​​the stacking location by a soldering head. In the stacking station, capacitor foils are accurately placed one by one onto the capacitor stack electrodes of the lead frame. They are then adhered to the negative electrode bonding area of ​​the lead frame with silver paste. The lead frame is then shifted one step, moving the next capacitor stack electrode to the stacking station on the turret, and the placement of the next capacitor foil begins. At the soldering station, the positive end of the capacitor foil already adhered to the capacitor stack electrodes on the lead frame is soldered to the positive electrode soldering area of ​​the lead frame by a soldering head. The capacitor foil in the negative electrode area is then pressed tightly and dried with heated air. After the first layer of capacitor foil has been placed and soldered at all capacitor electrode positions on the lead frame, the second layer of capacitor foil, with silver paste applied to the negative electrode area, is stacked one by one on top of the first layer. The negative and positive electrode areas of the second layer are stacked on top of the negative and positive electrode areas of the first layer, respectively. The negative electrode areas are bonded together with silver paste, and the positive electrode areas are soldered together. This stacking operation is repeated until the required number of layers is reached. Then, the lead frame is flipped over, and the same stacking operation is performed on the other side. The reverse stacking operation is completed in two stages on one mechanism. The total time required is the sum of the forward and flip stacking operations. The number of capacitors in the lead frame is approximately 30 to 40, usually 32. To complete the stacking of 3 layers of capacitors on both sides of a lead frame with 32 capacitors, it usually takes 2 to 3 minutes, including the flipping time. If 5 to 7 stacks can be completed per second, and each capacitor usually requires 6 layers of stacks, then on average only one capacitor can be stacked per second, making the stacking production efficiency of a single machine too low.

[0004] Since the lamination process is a critical step in multilayer aluminum capacitors, the accuracy and quality of the lamination greatly affect the capacitor's performance. The efficiency of the current lamination method, which involves stacking individual capacitors one by one, cannot be very high. The movement of each individual pick-up tip must be very fast, and the welding of the positive electrode area is also performed sequentially. The power-on time is approximately 75ms, the welding pulse can only be applied once, and the welding current must be very high, around 600-800A. High stability of the internal resistance of the welding loop is required, but in reality, the loop resistance is affected by many factors, including the instability of the solder joint contact resistance, which can cause fluctuations in the welding current, thus affecting the consistency of the welding effect. Furthermore, the existing technology places high demands on the speed and accuracy of each operation required for lamination, resulting in high costs. Adding the flipping time, the total time cannot be reduced. In conclusion, the existing technology has significant limitations in terms of quality, efficiency, and cost, requiring a major breakthrough from new technologies. Summary of the Invention

[0005] The purpose of this invention is to overcome the defects in the prior art and provide a high-efficiency stacking device for multilayer aluminum capacitors. The assembly line operation mode is twice as fast as the operation speed of the device with only one stacking mechanism. It can perform stacking operations of multiple foils at one time, which is highly efficient and low-cost. It can prevent deformation of the lead frame caused by the high temperature brought about by high-speed welding.

[0006] To achieve the above objectives, the technical solution of the present invention is to design a high-efficiency stacking device for multilayer aluminum capacitors, including a stacking mechanism and a lead frame flipping mechanism; the stacking mechanism is provided in one or two sets, and the stacking mechanism includes a capacitor process strip die-cutting device and a multi-station moving rail for the lead frame.

[0007] A further technical solution is to have two stacking mechanisms, located on either side of the lead frame flipping device. One stacking mechanism stacks only one side of the lead frame. After stacking, the lead frame enters the flipping mechanism from the first stacking mechanism. After flipping, the lead frame enters the second stacking mechanism for stacking the other side. At this point, the first stacking mechanism begins stacking the next lead frame. This assembly line operation mode is twice as fast as the operation of a single stacking mechanism.

[0008] A further technical solution is a capacitor process strip die-cutting device, which includes a process strip loading and unloading mechanism and a multi-foil die-cutting mechanism; The lead frame flipping mechanism is used to flip the lead frame after one side has been stacked with capacitor foil, and then send it into the lead frame multi-station moving rail to perform the stacking operation on the other side. The multi-station moving rail for the lead frame is a circular moving rail or a linear moving rail, and it is equipped with a lead frame feeding station, a silver paste dispensing station, a foil stacking station, a foil positive electrode welding station and a lead frame unloading station. Each of the aforementioned stations is equipped with a lead frame feeding device, a silver paste dispensing device, a multi-foil stacking device, a multi-foil positive electrode welding device and a lead frame unloading device, respectively. The stacking mechanism is provided in two sets; a multi-foil stacking device is provided between the multi-foil die-cutting mechanism and the foil stacking station of the multi-station moving rail of the lead frame; The multi-foil die-cutting device includes a lower die platform for capacitor foil die-cutting and an upper die for capacitor foil die-cutting.

[0009] The lead frame feeding device is used to remove the lead frame from the lead frame and feed it onto the lead frame moving rail, so that it can be moved horizontally to each work station. The silver paste application device consists of an array of movable silver paste application heads, which can apply silver paste to multiple negative electrode bonding areas on the lead frame or multiple negative electrode areas of stacked foils at one time.

[0010] The multi-foil stacking device includes a variable-pitch multi-suction head array, a multi-thin sheet position calibration and positioning device, and a stacking multi-suction head array; The multi-foil positive electrode welding device includes at least one, and the foil positive electrode welding station includes at least one. If there are multiple stations, each station only welds a portion of the foils, and the welding of all foils is completed by multiple stations. The multi-foil positive electrode welding device includes a negative electrode pressure plate array that presses down the negative electrode region of multiple foils. The multi-foil positive electrode welding device includes a row of current welding head arrays containing multiple welding heads, each welding head corresponding to a foil positive electrode. Alternatively, the multi-foil positive electrode welding device employs at least one laser welding device, each laser welding device using a scanning method to rapidly weld multiple foil positive electrodes, and the laser welding device includes a positive electrode pressure plate array that presses down the positive electrode region of multiple foils.

[0011] The multi-foil position calibration and positioning device includes a double positioning block arranged at right angles for positioning one corner and two sides of the foil, and a vibration table or a blower; the aforementioned double positioning block arranged at right angles is mounted on a vibration table or the air outlet of the aforementioned blower is positioned directly facing the foil. Vacuum suction holes are provided at the placement positions of each foil on the capacitor foil die-cutting platform.

[0012] The multi-foil positive electrode welding device is preferably an electric current welding device.

[0013] A foil pressing station may be added between the foil stacking station and the foil positive electrode welding station on the multi-station moving rail of the lead frame. A foil pressing array device containing several independent pressing heads is provided in conjunction with the aforementioned foil pressing station. The position of the independent pressing head corresponds to the position of several electrodes with stacked foils on the lead frame. The entire foil pressing array is set on a device that can move up and down.

[0014] The multi-foil stacking device may be equipped with an optical correction mechanism, including a photographic mechanism for acquiring the specific position of the lead frame located at the foil stacking station, and an adjustment mechanism for the multi-pickup head array to follow the specific position of the lead frame.

[0015] The present invention also provides a technical solution for high-efficiency stacking of multilayer aluminum capacitors, which employs the aforementioned high-efficiency stacking device for multilayer aluminum capacitors, and the stacking steps are as follows: Before the process strip enters the multi-foil die-cutting device, the upper die of the capacitor foil die-cutting device and the lower die platform of the capacitor foil die-cutting device are separate. When the capacitor process strip is moved to the multi-foil die-cutting device by the process strip loading and unloading mechanism, the multiple capacitor foils on the process strip are close to the lower die platform of the capacitor foil die-cutting device. Then the upper die of the capacitor foil die-cutting device moves downward and cuts multiple capacitor foils off the process strip at one time. Afterward, the upper die of the capacitor foil die-cutting device leaves the lower die platform of the capacitor foil die-cutting device, and the cut capacitor foils are still attached to the lower die platform of the capacitor foil die-cutting device. The variable-pitch multi-suction head array picks up multiple capacitor foils from the capacitor foil die-cutting platform. Then, the distance between the suction heads is adjusted so that the distance between the foils is the same as the spacing between multiple stacked electrodes on the lead frame. The foils are then placed on the multi-foil position calibration and positioning device. After each foil is calibrated and positioned on this device, it is picked up by the stacked multi-suction head array and moved to the capacitor foil stacking station on the lead frame moving rail above the lead frame. Multiple capacitor foils are then attached to the stacked electrodes on the lead frame that have been coated with silver paste, and the silver paste adheres to the negative electrode of the stacked electrodes. After applying silver paste to multiple negative electrode bonding areas of the lead frame or multiple stacked foil negative electrodes, the lead frame is transferred to the foil stacking station to complete the stacking operation of the current foil layer. Then, the lead frame is transferred to the foil positive electrode welding station to perform welding operations on the foil positive electrode area. The lead frame then repeats the aforementioned three steps on the lead frame multi-station moving rail to complete the required number of stacked layers. Once the required number of stacked layers is completed, the lead frame is moved out of the lead frame unloading station from the lead frame multi-station moving rail, and a new lead frame enters the lead frame multi-station moving rail from the lead frame loading station to begin repeating the stacking operation. Multiple foil stacking operations can be performed simultaneously, achieving high efficiency and low cost.

[0016] A further technical solution is that the stacking mechanism is equipped with a set of methods. For a lead frame that has completed all operations of stacking one side, if stacking on the reverse side is required, the lead frame unloading device sends the lead frame into the lead frame flipping mechanism. The flipped lead frame is then sent back into the lead frame multi-station moving rail for stacking on the reverse side. After all stacking operations are completed, the lead frame is transferred to the lead frame unloading station. A new lead frame enters the lead frame multi-station moving rail from the lead frame loading station, and the stacking operation is repeated for the new lead frame.

[0017] Another technical solution involves two stacking mechanisms. A lead frame flipping mechanism and a lead frame moving device are located between the lead frame unloading station in the first stacking mechanism and the lead frame loading station in the second stacking mechanism. The lead frame moving device retrieves the lead frame that has completed all stacking operations from the lead frame unloading station in the first stacking mechanism and sends it to the lead frame flipping mechanism for flipping. Then, the lead frame moving device moves it from the flipping mechanism to the lead frame multi-station moving rail in the second stacking mechanism for stacking operations on the other side of the lead frame. Once all stacking operations on the other side are completed, the lead frame unloading device in the second stacking mechanism unloads the lead frame.

[0018] A further technical solution is to perform double-sided stacking or single-sided stacking using the stacking method. When performing single-sided stacking, the lead frame flipping mechanism does not flip the lead frame. Each of the two stacking mechanisms stacks only a portion of the foil layers, and the two stacking mechanisms work together to complete the stacking of all layers. The first stacking mechanism completes only a portion of the stacking, and then the lead frame moving device removes the lead frame from the lead frame unloading station of the first stacking mechanism and sends it to the lead frame loading station of the second stacking mechanism to perform the stacking of the remaining layers. After the operation is completed, the unloading device of the second stacking mechanism unloads the lead frame.

[0019] A further technical solution involves placing several foils near the sides of a double positioning block arranged at right angles. Under the polarization effect of the vibration table, the foils move towards the two positioning edges until they stop on the two positioning edges, thus completing the position calibration operation. The spacing between all foils is consistent with the spacing between each stacked electrode on the lead frame, the angles between all foils remain parallel, and the final relative position of all foils is basically consistent with the relative position between the stacked electrodes on the lead frame. Subsequently, a precise stacking operation of multiple foils can be performed in one operation. Alternatively, a hairdryer can be used to blow air onto the outer edge of the foil to move the foil towards the positioning edge, thus completing the multi-foil position correction operation.

[0020] A further technical solution is that when the multiple capacitor foils on the process strip are close to the capacitor foil die-cutting lower die platform, the vacuum suction hole begins to form a negative pressure, which sucks the multiple capacitor foils onto the capacitor foil die-cutting lower die platform. Then, the upper die of the capacitor foil die-cutting performs the slicing operation of multiple foils. The cut multiple capacitor foils are still closely attached to the capacitor foil die-cutting lower die platform.

[0021] A further technical solution is that the positive electrode plate array is first pressed onto the positive electrode of the foil, so that the positive electrode of the foil is in close contact with the positive electrode of the lead frame below or the positive electrode area of ​​the previous foil that has been sequentially welded on it. The opening on each positive electrode plate exposes the area of ​​the foil that needs to be welded, so that the laser welding spot can perform welding in the area of ​​the foil that needs to be welded. Each time a lead frame with the latest layer of foil is moved to this station, the foil pressing array moves downward to uniformly press down the newly stacked foil in the lead frame so that the gaps in the foil stack are as small as possible. After the foil positive electrode is soldered at the next station, the accuracy of the foil stack will not be significantly affected. Alternatively, an optical correction mechanism can be added. The optical correction mechanism first takes a picture of the stacked electrode array that enters the lead frame of the foil stacking station to determine its actual position. Then, the stacking multi-pickup head array performs the stacking operation according to the actual position of the stacked electrode array.

[0022] The advantages and beneficial effects of this invention are as follows: the assembly line operation mode is twice as fast as the operation speed of the single-set stacking mechanism; multiple foil stacking operations can be performed at once, resulting in high efficiency and low cost; it can prevent deformation of the lead frame caused by the high temperature of high-speed welding; it can correct the relative error of the stacking position caused by the positioning error of the lead frame on the multi-station moving rail of the lead frame, thereby further improving the positional accuracy of the foil stacking operation; and it can extend the welding time of the foil positive electrode, thereby significantly improving the welding quality of the foil positive electrode. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a first embodiment of a high-efficiency stacked aluminum capacitor device according to the present invention; Figure 2 yes Figure 1 A schematic diagram of the process strip; Figure 3 yes Figure 2 Side view; Figure 4 yes Figure 1 A schematic diagram of the center lead frame; Figure 5 Yes Figure 3 A schematic diagram of die-cutting; Figure 6 yes Figure 5 Side view; Figure 7 yes Figure 6 A schematic diagram of the cut capacitor foil; Figure 8 yes Figure 7 Side view; Figure 9 yes Figure 1 Schematic diagram of the intermediate straightening process; Figure 10 yes Figure 9 A schematic diagram of the actual working conditions; Figure 11 yes Figure 10 Side view; Figure 12 yes Figure 1 A schematic diagram of the welding process; Figure 13 yes Figure 12 A magnified view of a portion of the image; Figure 14 yes Figure 12 Top view; Figure 15 yes Figure 12 A schematic diagram of the lead frame after it has been flipped over; Figure 16 yes Figure 1 A schematic diagram of the laser head welding process in the middle welding process; Figure 17 yes Figure 16 A magnified view of a portion of the image.

[0024] In the diagram: 1. Circular moving track; 2. Foil stacking station; 3. Variable distance multi-suction head array; 4. Multi-sheet position calibration and positioning device; 5. Stacking multi-suction head array; 6. Upper die-cutting die for capacitor foil; 7. Silver paste application station; 8. Welding station; 9. Foil pressing station; 10. Lead frame flipping mechanism; 11. Vacuum suction hole; 12. Process strip; 13. Capacitor foil positioning seat; 14. Upper die; 15. Lower die; 16. Process strip positioning seat; 17. Limiting head; 18. Capacitor foil; 19. Linear vibrator; 20. Pressing. Detailed Implementation

[0025] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0026] Example 1: As Figure 1 As shown, the present invention is a high-efficiency stacking device for stacked aluminum capacitors, including a stacking mechanism and a lead frame flipping mechanism 10.

[0027] The stacking mechanism includes a capacitor process strip die-cutting device and a multi-station moving rail for the lead frame.

[0028] The lead frame flipping mechanism flips the lead frame after one side has been stacked with capacitor foil, and then sends it into the lead frame multi-station moving rail to perform the stacking operation on the other side.

[0029] The stacking mechanism can be configured as two sets, with the lead frame flipping device placed between the two stacking devices. One set of stacking mechanisms stacks only one side of the lead frame. After stacking is completed, the lead frame enters the flipping mechanism from the first set of stacking mechanisms. After flipping the lead frame, the lead frame enters the second set of stacking mechanisms to perform the stacking operation on the other side. At this time, the first set of stacking mechanisms begins the stacking operation of the next lead frame. This assembly line operation mode is twice as fast as the operation speed of the single-set stacking mechanism.

[0030] The capacitor process strip die-cutting device includes a process strip loading and unloading mechanism and a multi-foil die-cutting mechanism. The multi-station moving rail of the lead frame can be a circular moving rail 1 or a linear moving rail, on which a lead frame loading station, a silver paste dispensing station 7, a foil stacking station 2, and a lead frame unloading station are respectively equipped with a lead frame loading device, a silver paste dispensing device, a multi-foil stacking device, a multi-foil positive electrode welding device, and a lead frame unloading device. The multi-foil stacking device, as described above, is arranged between the multi-foil die-cutting mechanism and the stacking station of the lead frame moving rail, and can perform stacking operations of multiple foils at one time to achieve the purpose of high efficiency and low cost. The preferred solution is to use a combination of two stacking mechanisms and one lead frame flipping device. This device can be selected to perform double-sided stacking or single-sided stacking only. When performing single-sided stacking only, the flipping device does not flip the foil. Each of the two stacking mechanisms stacks only a portion of the foil layers, and the two stacking mechanisms work together to complete the stacking of all layers. This stacking speed is twice as fast as the stacking device using only one stacking mechanism.

[0031] The multi-foil die-cutting device includes a lower die platform for capacitor foil die-cutting and an upper die for capacitor foil die-cutting. Before the process strip enters the device, the upper die for capacitor foil die-cutting and the lower die platform are separate. When the capacitor process strip is moved to the multi-foil die-cutting device by the process strip loading and unloading mechanism, the multiple capacitor foils on the process strip are close to the lower die platform. Then, the upper die 6 moves downward, cutting multiple capacitor foils off the process strip at once. Subsequently, the upper die leaves the lower die platform, and the cut capacitor foils remain attached to the lower die platform. The structure of the process strip is as follows: Figure 2 , Figure 3 As shown.

[0032] On the multi-station moving rail of the lead frame, at the lead frame loading station, the lead frame loading device takes the lead frame from the lead frame frame and feeds it onto the lead frame moving rail, moving it horizontally to each station; the structure of the lead frame is as follows. Figure 4 As shown.

[0033] In the silver paste application station, the silver paste application device consists of an array of movable silver paste application heads, which can apply silver paste to multiple negative electrode bonding areas or multiple negative electrodes with stacked foils on the lead frame at one time. In the aforementioned foil stacking station, the multi-foil stacking device includes a variable-pitch multi-suction head array 3, a multi-foil position calibration and positioning device 4, and a stacking multi-suction head array 5. The variable-pitch multi-suction head array picks up multiple capacitor foils from the capacitor foil die-cutting die platform, and then adjusts the distance between the suction heads so that the distance between the foils is the same as the spacing between multiple stacked electrodes on the lead frame. Then, the foils are placed on the multi-foil position calibration and positioning device, where each foil is position-calibrated and positioned. After being picked up by the stacking multi-suction head array, the foils are moved to the lead frame above the capacitor foil stacking station on the lead frame moving rail. Multiple capacitor foils are then attached to the stacked electrodes on the lead frame that have been coated with silver paste, and the silver paste adheres them to the negative electrode of the stacked electrodes. In the aforementioned foil positive electrode welding station, the multi-foil positive electrode welding device includes an array of current welding heads with multiple welding heads, each corresponding to a foil positive electrode. Multiple foil positive electrodes can be welded simultaneously. Each welding head has sufficient time for one or more current pulse welding operations. The peak current of the current pulse can be lower than the 600A-800A peak current required for short-time welding in existing technologies, achieving better welding quality. Alternatively, one or more laser welding devices can be used, each employing a scanning method to rapidly weld multiple foil positive electrodes. To prevent deformation of the lead frame due to the high temperature caused by high-speed welding, a layout with more than one welding station can be used. Each welding station welds eight foil sections, with multiple stations completing the welding of all foil sections, allowing the lead frame sufficient heat dissipation time to avoid heat deformation. The multi-foil positive electrode welding device includes a negative electrode pressure plate array that presses down the negative electrode regions of multiple foils; the negative electrode pressure plate array presses down the negative electrode regions of multiple foils, uniformly pressing down the newly stacked foils in the lead frame to minimize the gaps in the foil stack, while keeping the position of each foil layer unchanged.

[0034] After the lead frame enters the multi-station moving rail, it first moves to the silver paste application station. Silver paste is applied to multiple negative electrode bonding areas or multiple negative electrodes of the stacked foils on the lead frame. After completing the silver paste application, the next station the lead frame moves to is the foil stacking station. After completing the stacking operation of the current layer of foil, the next station the lead frame moves to is the foil positive electrode welding station. After welding the positive electrode area of ​​the foil, the lead frame repeats the above three steps on the multi-station moving rail to complete the required number of stacked layers. All stacked foils will have good overlap accuracy. Once the required number of lead frames have been stacked, the lead frames are moved from the lead frame unloading station onto the lead frame multi-station moving rail, and a new lead frame is moved from the lead frame loading station onto the lead frame multi-station moving rail, and the stacking operation is repeated for the new lead frame.

[0035] For a configuration with two stacking mechanisms, a lead frame flipping mechanism and a lead frame moving device are installed between the lead frame unloading station in the first stacking mechanism and the loading station in the second stacking mechanism. The lead frame moving device takes the lead frame that has completed all stacking operations from the unloading station of the first stacking mechanism and sends it to the flipping mechanism. After the lead frame is flipped, the lead frame moving device moves it from the flipping mechanism to the lead frame multi-station moving rail in the second stacking mechanism to perform the stacking operation on the other side of the lead frame. When all stacking operations on the other side are completed, the unloading device of the second stacking mechanism places the lead frame onto the lead frame.

[0036] If only single-sided lamination is performed, the first lamination mechanism completes only a portion of the lamination operation. Then, the lead frame moving device removes the lead frame from the unloading station of the first lamination mechanism and sends it to the loading station of the second lamination mechanism to perform the remaining lamination operation. After the operation is completed, the unloading device of the second lamination mechanism puts the lead frame into the lead frame.

[0037] The multi-foil stacking device includes a multi-foil position calibration and positioning device comprising a right-angled double positioning block for positioning one corner and two sides of a capacitor foil 18. The entire right-angled double positioning block is mounted on a vibration table, which is equipped with a linear vibrator 19. When multiple foils are placed near the sides of the double positioning edges, the foils move towards the two positioning edges under the polarization effect of the vibration table, finally stopping at the two positioning edges. This completes the position calibration operation for the multiple foils. The spacing between all foils is consistent with the spacing between the stacked electrodes on the lead frame, the angles between all foils remain parallel, and the final relative positions of all foils are essentially consistent with the relative positions between the stacked electrodes on the lead frame. Subsequently, a precise single-pass stacking operation of the multiple foils can be performed (the calibration and positioning process, also known as the regularization process). Figures 9 to 11 As shown.

[0038] The multi-foil position correction device described above can also use an air blower to blow air onto the outer edge of the foil, causing the foil to move towards the positioning edge, and finally complete the multi-foil position correction operation.

[0039] like Figure 5 , Figure 6 As shown, on the capacitor foil die-cutting lower die platform, a vacuum suction hole 11 is provided at each foil placement position. When multiple capacitor foils on the process strip 12 come close to the capacitor foil die-cutting lower die platform (i.e., abut against the capacitor foil positioning seat 13), the vacuum suction hole 11 begins to form a negative pressure, sucking the multiple capacitor foils onto the capacitor foil die-cutting lower die platform. Then, the upper die 14 of the capacitor foil die-cutting performs the slicing operation of multiple foils. A limiting head 17 with the same direction of movement is also provided on one side of the upper die 14 to limit the capacitor foils and prevent them from lifting during die-cutting. The cut capacitor foils remain tightly attached to the capacitor foil die-cutting lower die platform (e.g., ...). Figure 5 As shown, the capacitor foil die-cutting platform consists of a capacitor foil positioning seat 13, a lower die 15, and a process strip positioning seat 16 arranged sequentially. A schematic diagram after cutting is shown below. Figure 7 , Figure 8 As shown.

[0040] A multi-foil positive electrode welding device, if using a laser welding apparatus, includes a positive electrode pressing array that presses down the positive electrode regions of multiple foils. Each pressing array 20 has an opening, allowing the laser welding points to be distributed across the areas of the foil's positive electrode to be welded. The positive electrode pressing array first presses down on the positive electrode of the foil, ensuring the foil's positive electrode is in close contact with the underlying lead frame positive electrode or the positive electrode region of the previous foil already sequentially welded onto it. The opening on each positive electrode pressing array exposes the area of ​​the foil to be welded, allowing the laser welding spot to perform welding within that area. Figures 12 to 17 As shown.

[0041] The multi-station moving rail for the lead frame adds a foil pressing station 9 between the multi-foil stacking station and the multi-foil positive electrode welding station. This station is equipped with a foil pressing array device with multiple independent pressing heads corresponding to the multiple electrodes with stacked foils on the lead frame. The entire foil pressing array is mounted on a vertically movable device. Each time a lead frame with the latest layer of foil moves to this station, the foil pressing array moves downward, uniformly pressing down the newly stacked foil within the lead frame to minimize the gaps in the foil stacking. This ensures that the foil stacking accuracy is not significantly affected after the foil positive electrode is welded at the next station.

[0042] The multi-foil stacking device, equipped with an optical correction mechanism, first photographs the stacking electrode array of the lead frame entering the foil stacking station to determine its actual position. Then, the multi-pickup head array performs the stacking operation based on the actual position of the stacking electrode array. This method can correct the relative error in the stacking position caused by the positioning error of the lead frame on the multi-station moving rail of the lead frame, thereby further improving the positional accuracy of the foil stacking operation.

[0043] Example 2: The difference from Example 1 is that the stacking mechanism can be set up in only one set, which works in conjunction with the lead frame flipping mechanism to perform stacking operations on both sides of the lead frame.

[0044] For a configuration with only one stacking mechanism, in the lead frame unloading station, the lead frame unloading device, for a lead frame that has completed all operations of one side stacking, if reverse stacking is required, the unloading device sends the lead frame into the flipping device. The flipped lead frame is then sent back into the lead frame moving rail for reverse stacking. After all stacking operations are completed, the lead frame is placed on the lead frame at the lead frame unloading station. A new lead frame enters the lead frame multi-station moving rail from the lead frame loading station, and the above stacking operation is repeated for the new lead frame.

[0045] 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 technical principles 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 high-efficiency stacking device for multilayer aluminum capacitors, characterized in that, It includes a stacking mechanism and a lead frame flipping mechanism; the stacking mechanism is provided in one or two sets, and the stacking mechanism includes a capacitor process strip die-cutting device and a lead frame multi-station moving rail.

2. The high-efficiency stacking device for multilayer aluminum capacitors according to claim 1, characterized in that, The stacking mechanism has two sets, which are located on both sides of the lead frame flipping device.

3. A high-efficiency stacked aluminum capacitor device according to claim 1 or 2, characterized in that, The capacitor process strip die-cutting device includes a process strip loading and unloading mechanism and a multi-foil die-cutting mechanism.

4. The high-efficiency stacking device for multilayer aluminum capacitors according to claim 3, characterized in that, The lead frame flipping mechanism is used to flip the lead frame after one side has been stacked with capacitor foil, and then send it into the lead frame multi-station moving rail for stacking on the other side.

5. The high-efficiency stacking device for multilayer aluminum capacitors according to claim 4, characterized in that, The multi-station moving rail of the lead frame is a circular moving rail or a linear moving rail and is equipped with a lead frame feeding station, a silver paste dispensing station, a foil stacking station, a foil positive electrode welding station and a lead frame unloading station. Each of the aforementioned stations is equipped with a lead frame feeding device, a silver paste dispensing device, a multi-foil stacking device, a multi-foil positive electrode welding device and a lead frame unloading device, respectively. The stacking mechanism is provided in two sets; a multi-foil stacking device is provided between the multi-foil die-cutting mechanism and the foil stacking station of the multi-station moving rail of the lead frame; The multi-foil die-cutting mechanism includes a lower die platform for capacitor foil die-cutting and an upper die for capacitor foil die-cutting.

6. The high-efficiency stacking device for multilayer aluminum capacitors according to claim 5, characterized in that, The lead frame feeding device is used to remove the lead frame from the lead frame and feed it onto the lead frame moving rail, so that it can be moved horizontally to each work station. The silver paste application device consists of an array of movable silver paste application heads, which can apply silver paste to multiple negative electrode bonding areas on the lead frame or multiple negative electrode areas of stacked foils at one time.

7. The high-efficiency stacking device for multilayer aluminum capacitors according to claim 6, characterized in that, The multi-foil stacking device includes a variable-pitch multi-suction head array, a multi-thin sheet position calibration and positioning device, and a stacking multi-suction head array; The multi-foil positive electrode welding device includes at least one, and the foil positive electrode welding station includes at least one, or if there are several, each station only welds a portion of the foils, and the welding of all foils is completed by multiple stations; the multi-foil positive electrode welding device includes a negative electrode pressure plate array that presses down the negative electrode region of multiple foils; the multi-foil positive electrode welding device includes a row of current welding head arrays containing multiple welding heads, each welding head corresponding to a foil positive electrode; or the multi-foil positive electrode welding device employs at least one laser welding device, each laser welding device using a scanning method to rapidly weld multiple foil positive electrodes, the laser welding device including a positive electrode pressure plate array that presses down the positive electrode region of multiple foils.

8. The high-efficiency stacking device for multilayer aluminum capacitors according to claim 7, characterized in that, The multi-foil position calibration and positioning device includes a double positioning block arranged at right angles for positioning one corner and two sides of the foil, and a vibration table or a blower; the aforementioned double positioning block arranged at right angles is mounted on a vibration table or the air outlet of the aforementioned blower is positioned directly facing the foil. Vacuum suction holes are provided at the placement positions of each foil on the capacitor foil die-cutting platform.

9. A high-efficiency stacking device for multilayer aluminum capacitors according to claim 8, characterized in that, The multi-foil positive electrode welding device is a laser welding device. The laser welding device includes a positive electrode pressing plate array that presses down the positive electrode region of multiple foils. Each pressing plate in the pressing plate array has an opening so that the laser welding points are distributed in the area of ​​the foil positive electrode to be welded.

10. A high-efficiency stacking device for multilayer aluminum capacitors according to claim 9, characterized in that, Between the foil stacking station and the foil positive electrode welding station on the multi-station moving rail of the lead frame, there is also a foil pressing station. In conjunction with the aforementioned foil pressing station, there is a foil pressing array device containing several independent pressing heads. The position of the independent pressing heads corresponds to the position of several electrodes with stacked foils on the lead frame. The entire foil pressing array is set on a device that can move up and down. The multi-foil stacking device is equipped with an optical correction mechanism.

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