Laminated aluminum capacitor efficient lamination device and method

Abstract

The invention discloses an efficient lamination device for a laminated aluminum capacitor. The efficient lamination device comprises a lamination mechanism and a lead frame turn-over mechanism, and one or two sets of lamination mechanisms are arranged, and each lamination mechanism comprises a capacitor process strip die cutting device and a lead frame multi-station moving rail. The invention further discloses an efficient lamination method for the laminated aluminum capacitor, a plurality of capacitor foils are cut off from a process strip at a time, and the plurality of cut capacitor foils are still attached to the capacitor foil die cutting lower die platform; after a plurality of capacitor foils are calibrated and positioned, silver paste is dispensed at a plurality of negative electrode bonding areas of a lead frame or at negative electrodes of a plurality of stacked foils to finish silver paste dispensing, the lead frame is transferred to a foil lamination station, the lamination operation of the current layer of foil is finished, the lead frame is transferred to a foil positive electrode welding station, and the positive electrode areas of the foils are welded. And the lead frame repeats the above three steps on the lead frame multi-station moving rail to complete the required lamination layer number. The assembly line operation mode is high in operation speed.

Description

Technical Field

[0001] The invention relates to a high-efficiency lamination device and method for a laminated aluminum capacitor. Background Art

[0002] A laminated aluminum capacitor is a chip-type solid-state aluminum electrolytic capacitor that can replace expensive capacitors such as tantalum capacitors in some application scenarios. The interior of a laminated aluminum capacitor is composed of multiple capacitor foils stacked together, where the aluminum foil end is welded to the positive electrode of the electrode lead-out body as the anode electrode, and the silver electrode of the capacitor foil is glued layer by layer with silver paste and stacked on the negative electrode of the electrode lead-out body as the negative electrode. Its manufacturing process includes aluminum foil formation, slitting, process strip arrangement, impregnation polymerization, carbon paste silver paste coating, laminate welding, resin molding and other production processes. Among them, the laminate welding process is a process that is difficult to improve efficiency, has high requirements for laminate precision, and has a high implementation cost.

[0003] The prior art is that after the aluminum foil on the process bar has completed the capacitor foil process, the capacitor sheets are cut from the process bar one by one, and then picked up one by one with a turret suction head, and transferred by the turret to the 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 the visual correction station. After obtaining the position information, it is transferred to the capacitor foil stacking station. This station has a lead frame, and the lead frame is provided with a plurality of stacking electrodes that can accept capacitor foils 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 negative electrode area coated with silver paste is glued to the negative electrode area of ​​the stacking electrode, and the positive electrode area of ​​the capacitor foil is located on the positive electrode area of ​​the stacking position, and then welded to the positive electrode area of ​​the stacking area by the welding head. At the stacking station, the capacitor foils are accurately placed one by one on the capacitor stack electrodes of the lead frame. Then, silver paste is applied to the negative bonding area of ​​the lead frame. The lead frame is then shifted one step, and the next capacitor stack electrode is moved to the stacking station on the turret, where the next capacitor foil is placed. At the welding station, a welding head welds the positive terminal of the capacitor foil, which has already been attached to the capacitor stack electrode on the lead frame, to the positive welding area of ​​the lead frame. The capacitor foil in the negative area is then pressed tightly and dried with heated air. When the first layer of capacitor foil is placed on all the capacitor stack electrodes of the lead frame and welded, the second layer of capacitor foil with silver paste on the negative area begins to be stacked on the first layer of capacitor foil one by one. The negative and positive areas of the second layer of foil are respectively stacked on the negative and positive areas of the first layer of foil. The negative areas are glued together with silver paste, and the positive areas are connected together by welding. Then repeat the above stacking operation until the required number of layers are stacked. Then turn the lead frame over and start the same capacitor foil stacking operation on the other side. The positive and positive areas are stacked on top of each other. The reverse stacking operation is completed in two stages on one mechanism. The total time required is the sum of the time for the forward and reverse stacking operations. The number of capacitors on a lead frame is roughly 30 to 40, usually 32. To complete the stacking of three 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 stackings can be completed per second, and each capacitor usually requires 6 layers of stacking, then on average only one capacitor can be stacked per second, making the stacking production efficiency of a single machine too low.

[0004] Because the lamination process is a critical step in the production of laminated aluminum capacitors, the accuracy and quality of the lamination significantly impact the capacitor. The aforementioned lamination method, laminating one lamination at a time, cannot be very efficient. The individual suction tips must move very quickly, and the positive electrode areas are welded one by one. The power-up time is approximately 75 milliseconds, the welding pulse can only be single, and the welding current must be very high, approximately 600 to 800 amps. This places high demands on the stability of the internal resistance of the welding loop. However, the loop resistance is affected by many factors, including the instability of the contact resistance of the weld point, which can cause fluctuations in the welding current, affecting the consistency of the welding effect. Furthermore, existing technologies place high demands on the speed and accuracy of each lamination operation, which prohibits cost reduction. Combined with the flipping time, the total time cannot be reduced. In short, existing technologies have significant limitations in terms of quality, efficiency, and cost, requiring new technologies to achieve significant breakthroughs. Summary of the Invention

[0005] The object of the present invention is to overcome the defects existing in the prior art and provide a high-efficiency stacking device for laminated aluminum capacitors. The assembly line operation mode is twice as fast as the operation speed of the device with only one stacking mechanism. The device can stack multiple foils at a time, which is efficient and low-cost. The device can also prevent deformation of the lead frame caused by high temperature caused by high-speed welding.

[0006] To achieve the above objectives, the present invention provides a high-efficiency lamination device for laminated aluminum capacitors, comprising a lamination mechanism and a lead frame flipping mechanism. The lamination mechanism may be provided in one or two sets, and includes a capacitor process strip die-cutting device and a lead frame multi-station motion track. A single set of the lamination mechanism can be provided, which cooperates with the lead frame flipping mechanism to perform lamination operations on both sides of the lead frame.

[0007] A further technical solution is to provide two stacking mechanisms, one 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 passes from the first stacking mechanism to the flipping mechanism. After flipping, the lead frame passes to the second stacking mechanism for stacking on the other side. At this point, the first stacking mechanism begins stacking the next lead frame. This line operation mode is twice as fast as the one with only one stacking mechanism.

[0008] A further technical solution is that the capacitor process strip die-cutting device comprises a process strip loading and unloading mechanism and a multi-foil die-cutting mechanism;

[0009] The lead frame flipping mechanism is used to flip the lead frame after the capacitor foil is laminated on one side, and then send it to the lead frame multi-station moving track to perform the lamination operation on the other side;

[0010] The lead frame multi-station moving rail is a circular moving rail or a linear moving rail and is provided with a lead frame loading 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 above stations is 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;

[0011] The stacking mechanism is provided with two sets; a multi-foil stacking device is provided between the multi-foil die-cutting mechanism and the foil stacking station of the lead frame multi-station moving rail;

[0012] The multi-foil die-cutting device comprises a capacitor foil die-cutting lower die platform and a capacitor foil die-cutting upper knife die;

[0013] The lead frame loading device is used to take the lead frame out of the lead frame, feed it onto the lead frame moving rail, and move it horizontally to each work station;

[0014] The silver paste dispensing device is composed of a silver paste dispensing head array consisting of a plurality of movable silver paste dispensing heads, which can dispense silver paste at a plurality of negative electrode bonding areas on a lead frame or at the negative electrodes of a plurality of stacked foils at one time;

[0015] The multi-foil lamination device comprises a variable distance multi-suction head array, a multi-sheet position calibration and positioning device, and a lamination multi-suction head array;

[0016] The multi-foil positive electrode welding device is provided with at least one, and the foil positive electrode welding station is provided with at least one. If there are multiple, each station only welds part of the foil, and the welding of all the foils is completed by multiple stations; the multi-foil positive electrode welding device includes a negative electrode pressing plate array that presses the negative electrode areas 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 uses at least one laser welding device, each laser welding device uses a scanning method to quickly weld multiple foil positive electrodes, and the laser welding device includes a positive electrode pressing plate array that presses the positive electrode areas of multiple foils;

[0017] The multi-foil position calibration and positioning device includes a pair of positioning blocks arranged at right angles for positioning a corner and two sides of the foil, and a vibration table or a blower; the pair of positioning blocks arranged at right angles are mounted on a vibration table or the air outlet of the blower is arranged facing the foil;

[0018] A vacuum suction hole is provided at the placement position of each foil on the capacitor foil die-cutting lower die platform;

[0019] The multi-foil positive electrode welding device is a current welding device. The vacuum suction hole may not be provided.

[0020] A foil pressing station may be added between the foil stacking station and the foil positive electrode welding station of the lead frame multi-station moving track. A foil pressing array device containing several independent pressing heads is provided in conjunction with the aforementioned foil pressing station. The positions of the independent pressing heads correspond to the positions of several electrodes stacked with foil on the lead frame. The entire foil pressing array is set on a device that can move up and down.

[0021] The multi-foil lamination device is equipped with or can be additionally provided with an optical correction mechanism, including a photographing mechanism for obtaining the specific position of the lead frame at the foil lamination station, and an adjustment mechanism for the lamination multi-head array to follow the specific position of the lead frame.

[0022] The present invention also provides a technical solution, which is a method for efficiently laminating a laminated aluminum capacitor. The method uses the device for efficiently laminating a laminated aluminum capacitor. The lamination steps are as follows:

[0023] Before the process strip enters the multi-foil die-cutting device, the upper capacitor foil die-cutting knife die and the capacitor foil die-cutting lower die platform are separated. After 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 capacitor foil die-cutting lower die platform, and then the upper capacitor foil die-cutting knife die moves downward to cut multiple capacitor foils from the process strip at one time. Then, the upper capacitor foil die-cutting knife die leaves the capacitor foil die-cutting lower die platform, and the multiple capacitor foils cut are still placed on the capacitor foil die-cutting lower die platform;

[0024] A variable-distance multi-head array picks up multiple capacitor foils from the capacitor foil die-cutting lower die platform, then adjusts the distance between the heads so that the distance between the foils is the same as the spacing between the multiple laminated electrodes on the lead frame. The foils are then placed on a multi-foil position calibration and positioning device. Each foil is calibrated and positioned on this device, then picked up by the laminated multi-head array and moved to the capacitor foil lamination station on the lead frame moving track above the lead frame. The multiple capacitor foils are then placed on the laminated electrodes on the lead frame that have been coated with silver paste, and the silver paste adheres them to the negative electrode of the laminated electrodes.

[0025] After silver paste is applied to the leadframe's multiple negative electrode bonding areas or the negative electrodes of multiple stacked foils, the leadframe is transferred to the foil stacking station. After the stacking operation of the current foil layer is completed, the leadframe is transferred to the foil positive electrode welding station. After the positive area of ​​the foil is welded, the leadframe repeats the above three steps on the leadframe multi-station moving track to complete the required number of stacking layers. When the leadframe has completed the required number of stacking layers, the leadframe is removed from the leadframe multi-station moving track from the leadframe unloading station, and a new leadframe is entered from the leadframe loading station onto the leadframe multi-station moving track, and the above stacking operation begins again for the new leadframe. Multiple foils can be stacked at a time, achieving the goal of high efficiency and low cost.

[0026] A further technical solution is that the stacking mechanism is provided with a set. For a lead frame that has completed all operations of stacking on 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, and the flipped lead frame is sent back into the lead frame multi-station moving rail for stacking operation on the reverse side. After all stacking operations are completed, the lead frame is transferred to the lead frame unloading station, and the 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.

[0027] Another technical solution is that there are two sets of stacking mechanisms, and a lead frame flipping mechanism and a lead frame moving device are provided between the lead frame unloading station in the first set of stacking mechanisms and the lead frame loading station in the second set of stacking mechanisms; the lead frame moving device will take out the lead frame that has completed all stacking operations from the lead frame unloading station of the first set of stacking mechanisms, and send it to the lead frame flipping mechanism to flip the lead frame. The lead frame moving device will move it from the lead frame flipping mechanism to the lead frame multi-station moving rail in the second set of stacking mechanisms to perform stacking operations on the other side of the lead frame; when all stacking operations on the other side are completed, the lead frame unloading device of the second set of stacking mechanisms will unload the lead frame.

[0028] A further technical solution is that the lamination method performs double-sided lamination or only single-sided lamination; when only single-sided lamination is performed, the lead frame flipping mechanism does not flip over, and each of the two sets of lamination mechanisms only stacks a part of the layers of foil, and the two sets of lamination mechanisms together complete the lamination operation of all layers; the first set of lamination mechanisms only completes the lamination operation of part of the layers, and then the lead frame moving device takes the lead frame out from the lead frame unloading station of the first set of lamination mechanisms and sends it to the lead frame loading station of the second set of lamination mechanisms to perform the lamination operation of the remaining layers. After the operation is completed, the unloading device of the second set of lamination mechanisms performs the unloading operation on the lead frame.

[0029] A further technical solution is that several foils are placed near the side edges of the double positioning blocks arranged at right angles. Under the polarization effect of the vibration table, the foils move toward the two positioning edges until they stop on the two positioning edges. The position calibration operation of the several foils is completed. The spacing between all the foils is consistent with the spacing between the laminated electrodes on the lead frame. The angles between all the foils remain parallel. The final relative positions of all the foils are basically consistent with the relative positions between the laminated electrodes on the lead frame. Subsequently, the stacking operation of multiple foils can be accurately performed at one time.

[0030] Alternatively, a hair dryer is used to blow air on the outer edge of the foil to move the foil toward the positioning edge, thereby completing the multi-foil position correction operation.

[0031] A further technical solution is that when the multiple capacitor foils on the process bar are close to the capacitor foil die-cutting lower die platform, the vacuum suction holes begin to form negative pressure, sucking the multiple capacitor foils onto the capacitor foil die-cutting lower die platform, and then the upper knife die of the capacitor foil die-cutting performs slicing operations on multiple foils, and the cut multiple capacitor foils are still tightly attached to the capacitor foil die-cutting lower die platform.

[0032] A further technical solution is to use a negative electrode pressure plate array to press the negative electrode areas of multiple foils, uniformly pressing down the newly stacked foils in the lead frame to minimize the gaps in the foil stack while maintaining the position of each layer of foil unchanged; an electric current welding head array presses the positive electrode areas of the foils to perform welding; or, instead of using the electric current welding array, an array of positive electrode pressure plates is used to press the positive electrode of the foils, so that the positive electrode of the foils 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 welded thereto in sequence; an opening in each positive electrode pressure plate exposes the area of ​​the foil to be welded, so that the laser welding spot can perform welding on the area of ​​the foil to be welded;

[0033] Or the foil pressing station can be added. Each time the lead frame with the latest layer of foil is moved to this station, the foil pressing array moves downward to evenly press the newly stacked foil in the lead frame to make the gap in the foil stack as small as possible. After the positive electrode of the foil is welded at the next station, the accuracy of the foil stack is less affected by welding.

[0034] Or an optical correction mechanism can be added, which first takes a picture of the stacking electrode array of the lead frame entering the foil stacking station to determine its actual position, and then the stacking multi-head array performs the stacking operation according to the actual position of the stacking electrode array.

[0035] The advantages and beneficial effects of the present invention are as follows: the assembly line operation mode is twice as fast as the operation of the previous method with only one laminating mechanism; multiple foils can be laminated at a time, which is efficient and low-cost; deformation of the lead frame caused by high temperatures caused by high-speed welding can be prevented; relative lamination position errors caused by positioning errors of the lead frame on the lead frame multi-station moving rail can be corrected, thereby further improving the position accuracy of the foil lamination operation. The welding time of the foil positive electrode can be extended, thereby significantly improving the welding quality of the foil positive electrode. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 Schematic diagram of a first embodiment of a high-efficiency laminated aluminum capacitor device according to the present invention;

[0037] Figure 2 yes Figure 1 Schematic diagram of the process bar;

[0038] Figure 3 yes Figure 2 Side view of

[0039] Figure 4 yes Figure 1 Schematic diagram of the lead frame;

[0040] Figure 5 Yes Figure 3 Schematic diagram of die cutting;

[0041] Figure 6 yes Figure 5 Side view of;

[0042] Figure 7 yes Figure 6 Schematic diagram of the capacitor foil after cutting;

[0043] Figure 8 yes Figure 7 Side view of;

[0044] Figure 9 yes Figure 1 Schematic diagram of the regularization process;

[0045] Figure 10 yes Figure 9 Schematic diagram of actual working conditions;

[0046] Figure 11 yes Figure 10 Side view of;

[0047] Figure 12 yes Figure 1 Schematic diagram of the welding process;

[0048] Figure 13 yes Figure 12 A partial enlarged schematic diagram;

[0049] Figure 14 yes Figure 12 A top view of

[0050] Figure 15 yes Figure 12 Schematic diagram of the lead frame after turning over;

[0051] Figure 16 yes Figure 1 Schematic diagram of the welding process using laser head welding;

[0052] Figure 17 yes Figure 16 A partial enlarged schematic diagram.

[0053] In the figure: 1. Annular moving rail; 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 cutting die for capacitor foil; 7. Silver paste dispensing station; 8. Welding station; 9. Foil pressing station; 10. Lead frame flipping mechanism; 11. Vacuum suction hole; 12. Process bar; 13. Capacitor foil positioning seat; 14. Upper cutting die; 15. Lower cutting die; 16. Process bar positioning seat; 17. Limiting head; 18. Capacitor foil; 19. Linear vibrator; 20. Pressing. DETAILED DESCRIPTION

[0054] The following embodiments are further described in conjunction with the accompanying drawings and examples. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0055] Example 1: Figure 1 As shown, the present invention is a high-efficiency lamination device for a laminated aluminum capacitor, comprising a lamination mechanism and a lead frame turning mechanism 10.

[0056] The lamination mechanism includes a capacitor process strip die-cutting device and a lead frame multi-station moving rail.

[0057] The lead frame flipping mechanism flips the lead frame after the capacitor foil is stacked on one side, and then sends it to the lead frame multi-station moving track to perform the stacking operation on the other side.

[0058] The stacking mechanism can be set as two sets, and the lead frame flipping device is set between the two stacking devices. One set of stacking mechanisms only stacks on one side of the lead frame. After the stacking is completed, the lead frame enters the flipping mechanism from the first set of stacking mechanisms. After the lead frame is flipped, 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 starts the stacking operation of the next lead frame. Such an assembly line operation mode is twice as fast as the operation speed of the said method with only one set of stacking mechanisms.

[0059] A capacitor process strip die-cutting device includes a process strip loading and unloading mechanism and a multi-foil die-cutting mechanism; the lead frame multi-station moving rail can be a circular moving rail 1 or a linear moving rail, on which are provided a lead frame loading station, a silver paste dispensing station 7, a foil laminating station 2, and a lead frame unloading station, wherein these stations are respectively equipped with a lead frame loading device, a silver paste dispensing device, a multi-foil laminating device, a multi-foil positive electrode welding device, and a lead frame unloading device; the multi-foil laminating device as described above is arranged between the multi-foil die-cutting mechanism and the laminating station of the lead frame moving rail, and can perform lamination operations on multiple foils at a time to achieve the purpose of high efficiency and low cost;

[0060] The preferred solution is to use two stacking mechanisms in combination with a lead frame flipping device. This device can perform double-sided or single-sided stacking. When stacking only one side, the flipping device 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 together complete the stacking operation. This stacking speed is twice as fast as a stacking device using only one stacking mechanism.

[0061] The multi-foil die-cutting device includes a capacitor foil die-cutting lower die platform and a capacitor foil die-cutting upper knife die. Before the process strip enters the device, the capacitor foil die-cutting upper knife die is separated from the capacitor foil die-cutting lower die platform. When the capacitor process strip is moved to the multi-capacitor foil die-cutting device by the process strip loading and unloading mechanism, the multiple capacitor foils on the process strip are close to the capacitor foil die-cutting lower die platform. Then the capacitor foil die-cutting upper knife die 6 moves downward to cut multiple capacitor foils from the process strip at one time. Then the capacitor foil die-cutting upper knife die leaves the capacitor foil die-cutting lower die platform, and the multiple capacitor foils cut are still placed on the capacitor foil die-cutting lower die platform. The structure of the process strip is as follows: Figure 2 、 Figure 3 shown.

[0062] On the lead frame multi-station moving rail, at the lead frame loading station, the lead frame loading device is taken out from the lead frame, and sent to the lead frame moving rail, and moved to each station in a horizontal manner; the structure of the lead frame is as follows Figure 4 shown.

[0063] In the silver paste dispensing station, the silver paste dispensing device is composed of a silver paste dispensing head array consisting of a plurality of movable silver paste dispensing heads, which can dispense silver paste at multiple negative electrode bonding areas on the lead frame or at the negative electrodes of multiple stacked foils at one time;

[0064] The multi-foil lamination station includes a multi-foil lamination device comprising a variable-distance multi-head array 3, a multi-sheet position calibration and positioning device 4, and a lamination multi-head array 5. The variable-distance multi-head array picks up multiple capacitor foils from the capacitor foil die-cutting lower die platform, then adjusts the distance between the heads so that the distance between the foils is the same as the spacing between the multiple laminated 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 lamination multi-head array and moved to the lead frame above the capacitor foil lamination station on the lead frame moving track. The multiple capacitor foils are then placed on the laminated electrodes on the lead frame that have been coated with silver paste, and the silver paste bonds them to the negative electrodes of the laminated electrodes.

[0065] In the foil positive electrode welding station, a multi-foil positive electrode welding device is provided, which includes a row of current welding head arrays containing multiple welding heads, each welding head corresponds to a foil positive electrode, and can be pressed on multiple foil positive electrodes for welding at the same time. Each welding head has sufficient time to perform one or more current pulse pressure welding. The current peak value of the current pulse can be smaller than the current peak value of 600A to 800A required for short-time single welding used in the prior art, which can achieve better welding quality; or at least one laser welding device is used, and each laser welding device uses a scanning method to quickly weld multiple foil positive electrodes; in order to prevent the lead frame from being deformed due to the high temperature caused by high-speed welding, a layout of more than one welding station can be adopted, each welding station only welds 8 parts of the foil, and the welding of all the foils is completed by multiple stations, so that the lead frame has sufficient heat dissipation time to avoid heat deformation. The multi-foil positive electrode welding device includes a negative electrode pressing sheet array that presses the negative electrode areas of multiple foils; the negative electrode pressing sheet array presses the negative electrode areas 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 layer of foil unchanged.

[0066] After entering the lead frame multi-station moving track, the lead frame first moves to the silver paste application station. Silver paste is applied to the multiple negative electrode bonding areas of the lead frame or the negative electrodes of multiple stacked foils. After the silver paste application is completed, the next station the lead frame moves to is the foil stacking station. After the stacking operation of the current layer of foil is completed, the next station the lead frame moves to is the foil positive electrode welding station. After the positive electrode area of ​​the foil is welded, the lead frame repeats the above three steps on the lead frame multi-station moving track to complete the required number of stacking layers. All stacked foils will have a good overlap accuracy;

[0067] When the lead frame completes the required number of stacking layers, the lead frame moves out of the lead frame multi-station moving track from the lead frame unloading station, and a new lead frame enters the lead frame multi-station moving track from the lead frame loading station, and the above stacking operation is repeated for the new lead frame.

[0068] For configurations with two stacking mechanisms, a leadframe flipping mechanism and a leadframe moving device are located between the leadframe unloading station in the first stacking mechanism and the loading station in the second stacking mechanism. The leadframe moving device removes the fully stacked leadframe from the unloading station in the first stacking mechanism and transports it to the flipping mechanism. After the leadframe is flipped, the leadframe moving device moves it from the flipping mechanism to the leadframe multi-station moving track in the second stacking mechanism for stacking on the other side. Once all stacking on the other side is complete, the unloading device in the second stacking mechanism places the leadframe onto the leadframe.

[0069] If only single-sided lamination is performed, the first lamination mechanism only completes the lamination operation of part of the layers, and then the lead frame moving device takes the female wire frame out from the unloading station of the first lamination mechanism and sends it to the loading station of the second lamination mechanism to perform the lamination operation of the remaining layers. After the operation is completed, the unloading device of the second lamination mechanism places the lead frame into the lead frame.

[0070] A multi-foil lamination device, wherein the multi-foil position calibration and positioning device includes a double positioning block arranged at a right angle for positioning a corner and two sides of the capacitor foil 18, and the entire double positioning block arranged at a right angle is installed on a vibration table, on which a linear vibrator 19 is provided. After a plurality of foils are placed near the side edges of the double positioning edges, the foils move toward the two positioning edges under the polarization effect of the vibration table, and finally stop at the two positioning edges, and the plurality of foils complete the position calibration operation, the spacing between all the foils is consistent with the spacing between the laminated electrodes on the lead frame, the angles between all the foils remain parallel, and the final relative positions of all the foils are basically consistent with the relative positions between the laminated electrodes on the lead frame, and then an accurate lamination operation (calibration and positioning process, i.e., regularization process) on the multiple foils can be performed. Figures 9 to 11 shown.

[0071] The multi-foil position correction device as described above can also use an air blowing port to blow air to the outer edge of the foil to move the foil toward the positioning edge, and finally complete the multi-foil position correction operation.

[0072] like Figure 5 、 Figure 6 As shown, on the capacitor foil die-cutting lower die platform, a vacuum suction hole 11 is provided at the placement position of each foil. When the multiple capacitor foils on the process bar 12 are close to the capacitor foil die-cutting lower die platform (that is, they are 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, and then the capacitor foil die-cutting upper knife die 14 performs a slicing operation on the multiple foils. A limit head 17 is also provided on one side of the upper knife die 14 in the same direction of movement as that of the upper knife die 14 for limiting the capacitor foil to avoid warping during die-cutting. The cut multiple capacitor foils are still tightly attached to the capacitor foil die-cutting lower die platform (as shown in FIG. Figure 5 As shown, the capacitor foil die-cutting lower die platform is composed of a capacitor foil positioning seat 13, a lower cutting die 15 and a process strip positioning seat 16 arranged in sequence. The schematic diagram after cutting is as follows Figure 7 、 Figure 8 shown.

[0073] The multi-foil positive electrode welding device, if a laser welding device is used, is provided with a positive electrode pressing sheet array that presses the positive electrode areas of multiple foils. An opening is provided on each pressing sheet 20 so that the laser welding points can be distributed in the area where the positive electrode of the foil needs to be welded. The positive electrode pressing sheet array is first pressed on the positive electrode of the foil so that the positive electrode of the foil is tightly attached to the positive electrode of the lead frame below or the positive electrode area of ​​the previous foil that has been welded thereon in sequence. The opening on each positive electrode pressing sheet exposes the area of ​​the foil to be welded, so that the laser welding spot can perform welding in the area where the foil needs to be welded. Figures 12 to 17 shown.

[0074] The leadframe multi-station moving track features 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 foil-stacked electrodes on the leadframe. The entire foil pressing array is mounted on a movable device that moves up and down. Each time a leadframe with a newly stacked layer of foil moves to this station, the foil pressing array moves downward to evenly press down the newly stacked foil within the leadframe, minimizing gaps in the foil stack. This ensures that the foil positive electrode will not significantly affect the foil stacking accuracy after welding at the next station.

[0075] The multi-foil lamination device is equipped with an optical correction mechanism. It first photographs the lamination electrode array of the lead frame entering the foil lamination station to determine its actual position. The lamination head array then performs the lamination operation based on the actual position of the lamination electrode array. This method corrects relative lamination position errors caused by lead frame positioning errors on the lead frame multi-station moving rails, further improving the positional accuracy of the foil lamination operation.

[0076] Embodiment 2: The difference from embodiment 1 is that the lamination mechanism may be provided with only one set, which cooperates with the lead frame flipping mechanism to perform lamination operations on both sides of the lead frame.

[0077] For the configuration with only one set of stacking mechanism, the lead frame blanking device is provided at the lead frame blanking station. For the lead frame that has completed all the operations of stacking on one side, if stacking on the reverse side is required, the blanking device sends the lead frame to the flipping device, and the flipped lead frame is sent back to the lead frame moving rail for stacking on the reverse side. After all the stacking operations are completed, the lead frame is placed on the lead frame at the lead frame blanking station, and a new lead frame enters the lead frame multi-station moving rail from the lead frame loading station, and the above-mentioned stacking operation is repeated for the new lead frame.

[0078] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A high-efficiency laminated aluminum capacitor device, characterized in that: It includes a lamination mechanism and a lead frame turning mechanism; the lamination mechanism is provided with one or two sets, and the lamination mechanism includes a capacitor process strip die-cutting device and a lead frame multi-station moving rail.

2. The high-efficiency laminated aluminum capacitor device according to claim 1, characterized in that: The lamination mechanism is provided with two sets and is respectively located on both sides of the lead frame turning device.

3. A laminated aluminum capacitor high-efficiency laminate 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; The lead frame flipping mechanism is used to flip the lead frame after the capacitor foil is laminated on one side, and then send it to the lead frame multi-station moving track to perform the lamination operation on the other side; The lead frame multi-station moving rail is a circular moving rail or a linear moving rail and is provided with a lead frame loading 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 above stations is 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 stacking mechanism is provided with two sets; a multi-foil stacking device is provided between the multi-foil die-cutting mechanism and the foil stacking station of the lead frame multi-station moving rail; The multi-foil die-cutting device comprises a capacitor foil die-cutting lower die platform and a capacitor foil die-cutting upper knife die; The lead frame loading device is used to take the lead frame out of the lead frame, feed it onto the lead frame moving rail, and move it horizontally to each work station; The silver paste dispensing device is composed of a silver paste dispensing head array consisting of a plurality of movable silver paste dispensing heads, which can dispense silver paste at a plurality of negative electrode bonding areas on a lead frame or at the negative electrodes of a plurality of stacked foils at one time; The multi-foil lamination device comprises a variable distance multi-suction head array, a multi-sheet position calibration and positioning device, and a lamination multi-suction head array; The multi-foil positive electrode welding device is provided with at least one, and the foil positive electrode welding station is provided with at least one. If there are multiple, each station only welds part of the foil, and the welding of all the foils is completed by multiple stations; the multi-foil positive electrode welding device includes a negative electrode pressing plate array that presses the negative electrode areas 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 uses at least one laser welding device, each laser welding device uses a scanning method to quickly weld multiple foil positive electrodes, and the laser welding device includes a positive electrode pressing plate array that presses the positive electrode areas of multiple foils; The multi-foil position calibration and positioning device includes a pair of positioning blocks arranged at right angles for positioning a corner and two sides of the foil, and a vibration table or a blower; the pair of positioning blocks arranged at right angles are mounted on a vibration table or the air outlet of the blower is arranged facing the foil; A vacuum suction hole is provided at the placement position of each foil on the capacitor foil die-cutting lower die platform; The multi-foil positive electrode welding device is a current welding device.

4. The high-efficiency laminated aluminum capacitor device according to claim 3, characterized in that: A foil pressing station is also provided between the foil stacking station and the foil positive electrode welding station of the lead frame multi-station moving rail. A foil pressing array device containing several independent pressing heads is provided in conjunction with the aforementioned foil pressing station. The positions of the independent pressing heads correspond to the positions of several electrodes stacked with foil on the lead frame; the entire foil pressing array is set on a device that can move up and down.

5. The high-efficiency laminated aluminum capacitor device according to claim 3, characterized in that: The multi-foil lamination device is equipped with an optical correction mechanism, a camera mechanism for obtaining the specific position of the lead frame at the foil lamination station, and an adjustment mechanism for the lamination multi-head array to follow the specific position of the lead frame.

6. A high-efficiency lamination method for laminated aluminum capacitors, characterized in that: The high-efficiency lamination device for laminated aluminum capacitors as claimed in claim 3 is used, and the lamination steps are as follows: Before the process strip enters the multi-foil die-cutting device, the upper capacitor foil die-cutting knife die and the capacitor foil die-cutting lower die platform are separated. After 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 capacitor foil die-cutting lower die platform, and then the upper capacitor foil die-cutting knife die moves downward to cut multiple capacitor foils from the process strip at one time. Then, the upper capacitor foil die-cutting knife die leaves the capacitor foil die-cutting lower die platform, and the multiple capacitor foils cut are still placed on the capacitor foil die-cutting lower die platform; A variable-distance multi-head array picks up multiple capacitor foils from the capacitor foil die-cutting lower die platform, then adjusts the distance between the heads so that the distance between the foils is the same as the spacing between the multiple laminated electrodes on the lead frame. The foils are then placed on a multi-foil position calibration and positioning device. Each foil is calibrated and positioned on this device, then picked up by the laminated multi-head array and moved to the capacitor foil lamination station on the lead frame moving track above the lead frame. The multiple capacitor foils are then placed on the laminated electrodes on the lead frame that have been coated with silver paste, and the silver paste adheres them to the negative electrode of the laminated electrodes. After silver paste is applied to multiple negative electrode bonding areas of the lead frame or the negative electrodes of multiple stacked foils, the lead frame is transferred to the foil stacking station. After the stacking operation of the current layer of foil is completed, the lead frame is transferred to the foil positive electrode welding station. After the welding operation is performed on the positive electrode area of ​​the foil, the lead frame repeats the above three steps on the lead frame multi-station moving rail to complete the required number of stacking layers; when the lead frame completes the required number of stacking layers, the lead frame moves out of the lead frame multi-station moving rail from the lead frame unloading station, and 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.

7. The method for high-efficiency lamination of laminated aluminum capacitors according to claim 6, characterized in that: The stacking mechanism is provided with a set. For a lead frame that has completed all operations of stacking on 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, and the flipped lead frame is sent back into the lead frame multi-station moving rail to perform the stacking operation on the reverse side. After all stacking operations are completed, the lead frame is transferred to the lead frame unloading station, and 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.

8. The method for high-efficiency lamination of laminated aluminum capacitors according to claim 6, characterized in that: The stacking mechanism is provided with two sets, and a lead frame flipping mechanism and a lead frame moving device are provided between the lead frame unloading station in the first set of stacking mechanism and the lead frame loading station in the second set of stacking mechanism; the lead frame moving device will take out the lead frame that has completed all the stacking operations from the lead frame unloading station of the first set of stacking mechanism, and send it to the lead frame flipping mechanism to flip the lead frame, and then the lead frame moving device will move it from the lead frame flipping mechanism to the lead frame multi-station moving rail in the second set of stacking mechanism to perform the stacking operation on the other side of the lead frame; when all the stacking operations on the other side are completed, the lead frame unloading device of the second set of stacking mechanism will unload the lead frame.

9. The method for high-efficiency lamination of laminated aluminum capacitors according to claim 8, characterized in that: The lamination method can perform double-sided lamination or only single-sided lamination; when only single-sided lamination is performed, the lead frame turning mechanism does not turn over, and each of the two lamination mechanisms only stacks a portion of the layers of foil, and the two lamination mechanisms together complete the lamination operation of all the layers; the first set of lamination mechanisms only completes the lamination operation of a portion of the layers, and then the lead frame moving device takes the lead frame out of the lead frame unloading station of the first set of lamination mechanisms and sends it to the lead frame loading station of the second set of lamination mechanisms to perform the lamination operation of the remaining layers. After the operation is completed, the unloading device of the second set of lamination mechanisms unloads the lead frame.

10. The high-efficiency lamination method for laminated aluminum capacitors according to claim 6, characterized in that: Several foils are placed near the sides of the double positioning blocks arranged at right angles. Under the polarization of the vibration table, the foils move toward the two positioning edges until they stop on the two positioning edges. The position calibration operation of several foils is completed. The spacing between all foils is consistent with the spacing between the laminated electrodes on the lead frame. The angles between all foils remain parallel. The final relative positions of all foils are basically consistent with the relative positions between the laminated electrodes on the lead frame. Subsequently, the accurate lamination operation of multiple foils can be carried out at one time. Alternatively, a hair dryer is used to blow air on the outer edge of the foil to move the foil toward the positioning edge, thereby completing the multi-foil position correction operation.

11. The high-efficiency lamination method for laminated aluminum capacitors according to claim 6, characterized in that: When the multiple capacitor foils on the process bar are close to the capacitor foil die-cutting lower die platform, the vacuum suction holes begin to form negative pressure, sucking the multiple capacitor foils onto the capacitor foil die-cutting lower die platform, and then the upper knife die of the capacitor foil die-cutting performs slicing operations on the multiple foils. The cut multiple capacitor foils are still tightly attached to the capacitor foil die-cutting lower die platform.

12. The method for high-efficiency lamination of laminated aluminum capacitors according to claim 6, characterized in that: The negative electrode pressing sheet array presses the negative electrode areas of multiple foils, uniformly pressing down the newly stacked foils in the lead frame to minimize the gaps between the foils while maintaining the position of each layer of foil unchanged; the current welding head array presses the positive electrode areas of the foils to perform welding; or, instead of using the current welding array, the positive electrode pressing sheet array presses the positive electrode of the foil to closely contact the positive electrode of the lead frame below or the positive electrode area of ​​the previous foil that has been sequentially welded to it; the opening on each positive electrode pressing sheet exposes the area of ​​the foil to be welded, allowing the laser welding spot to perform welding in the area of ​​the foil to be welded; Or the foil pressing station can be added. Each time the lead frame with the latest layer of foil is moved to this station, the foil pressing array moves downward to evenly press the newly stacked foil in the lead frame to make the gap in the foil stack as small as possible. After the positive electrode of the foil is welded at the next station, the accuracy of the foil stack is less affected by welding.

13. The method for high-efficiency lamination of laminated aluminum capacitors according to claim 6, characterized in that: The optical correction mechanism first takes a picture of the stacking electrode array of the lead frame entering the foil stacking station to determine its actual position, and then the stacking multi-head array performs the stacking operation according to the actual position of the stacking electrode array.

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