Composite current collector welding device
The composite current collector welding device, which integrates drilling, gluing, and welding mechanisms, solves the problems of welding strength and light transmittance in composite current collector welding, improves welding quality and process yield, and ensures the stability and consistency of the welding process.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- YANGZHOU NANOPORE INNOVATIVE MATERIALS TECH LTD
- Filing Date
- 2025-06-18
- Publication Date
- 2026-06-16
AI Technical Summary
Existing welding processes cannot simultaneously meet the requirements of high welding strength and low light transmittance for composite current collectors. Furthermore, metal shavings accumulation and uneven stress in the tab area are prone to occur during the welding process, resulting in low process yield and damage to the tab area.
The integrated design of electrode unwinding mechanism, foil unwinding mechanism, punching mechanism, adhesive coating mechanism and welding mechanism ensures effective welding and flattening of foil and electrode by punching, applying conductive adhesive and welding, combined with drying, pressing and tension control.
This approach achieves reduced light transmittance while maintaining welding strength, improves welding quality and process yield, avoids foil misalignment and damage to the tab area, and ensures the stability and consistency of the welding process.
Smart Images
Figure CN224359502U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of battery technology and relates to a welding device, particularly a composite current collector welding device. Background Technology
[0002] Composite current collectors have gained widespread attention in the lithium battery industry due to their ability to improve battery energy density and safety. Since the middle layer of a composite current collector is a non-conductive polymer layer, it requires a transition soldering process to achieve conductivity. Transition soldering involves welding a layer of conventional metal foil to each of the two metal layers. The welded metal foil conducts the current, and further pre-soldering completes the conductivity. Existing welding processes often cannot simultaneously meet the requirements of weld strength and light transmittance. Higher weld strength usually comes with higher light transmittance, but excessively high light transmittance leads to increased overcurrent resistance, affecting battery performance. Furthermore, during prolonged welding, the accumulation of metal shavings on the welding head and welding station increases the likelihood of welding head / station adhesion, reducing process yield. In addition, composite current collectors typically exhibit greater deformation after rolling than traditional current collectors because the extension of the tab area and the active material area is inconsistent, often resulting in uneven tension on both sides—one side is taut, and the other is slack. This situation becomes more pronounced after welding, as the welded conventional foil is not under tension control and tends to shrink towards the active material area, causing damage to the tab area. At the same time, uneven stress can also cause the winding drum to run or even unwind. Utility Model Content
[0003] This invention provides a composite current collector welding device to overcome the shortcomings of the prior art.
[0004] To achieve the above objectives, the present invention adopts the following technical solution:
[0005] A composite current collector welding device includes an electrode unwinding mechanism, a foil unwinding mechanism, a punching mechanism, an adhesive coating mechanism, and a welding mechanism. The electrode unwinding mechanism is used to unwind electrode sheets. The foil unwinding mechanism includes a first foil unwinding mechanism for unwinding a first foil and a second foil unwinding mechanism for unwinding a second foil. The first and second foils output by the foil unwinding mechanism are respectively located on both sides of the tab area of the electrode sheet. The punching mechanism is used to punch holes in the tab area of the electrode sheet. The adhesive coating mechanism is used to coat the two sides of the tab area after punching with conductive adhesive. The welding mechanism is used to weld the first and second foils to the two sides of the tab area after adhesive coating.
[0006] To optimize the above technical solution, the specific measures also include:
[0007] Furthermore, the punching mechanism includes a needle roller; the needle roller is disposed on one side of the electrode sheet output by the electrode sheet unwinding mechanism, and is capable of punching through the tab area to form a through hole structure.
[0008] Furthermore, the punching mechanism also includes a dust collection platform; the dust collection platform is located below the needle roller and is used to collect dust and debris generated during punching.
[0009] Furthermore, it also includes a traction mechanism and a pressing mechanism; the traction mechanism is disposed between the adhesive coating mechanism and the welding mechanism, and the traction mechanism includes two traction rollers arranged opposite each other, the two traction rollers being used to pull the first foil and the second foil to the two side surfaces of the tab area of the electrode sheet respectively; the pressing mechanism is disposed between the traction mechanism and the welding mechanism; the pressing mechanism includes two pressure rollers arranged opposite each other, the two pressure rollers cooperating with each other to press the first foil, the electrode sheet and the second foil stacked in sequence.
[0010] Furthermore, it also includes a drying mechanism; the drying mechanism is disposed between the pressing mechanism and the welding mechanism, and is used to dry the conductive adhesive applied by the coating mechanism.
[0011] Furthermore, the welding mechanism includes a roller welding ultrasonic welding head and a roller welding station, which are arranged opposite to each other on both sides of the first foil, the electrode and the second foil stacked in sequence, for welding the first foil and the second foil to the two sides of the tab area of the electrode respectively.
[0012] Furthermore, both the ultrasonic welding head and the ultrasonic welding station are equipped with cleaning components that come into contact with their surfaces. The cleaning components are used to wipe alcohol off their surfaces by rolling the ultrasonic welding head / ultrasonic welding station.
[0013] Furthermore, the welding mechanism also includes a welding oven; the ultrasonic welding head and the welding station are both located inside the welding oven, which heats the interior of the oven.
[0014] Furthermore, the welding mechanism also includes two sets of guide rollers and hot rollers; both sets of guide rollers and hot rollers are arranged inside the welding oven, and are respectively arranged upstream and downstream of the ultrasonic welding head and the ultrasonic welding station. The hot rollers are arranged between the guide rollers and the ultrasonic welding head and the ultrasonic welding station. The guide rollers are used to adjust the tension, and the hot rollers are used for heating.
[0015] Furthermore, it also includes a winding mechanism and a tension roller mechanism; the winding mechanism is located downstream of the welding mechanism and is used to wind up the composite current collector after welding; the tension roller mechanism is used to adjust the tension of the composite current collector welding device during winding or unwinding; the tension roller mechanism includes four sets of tension roller mechanisms, three sets of tension roller mechanisms are respectively arranged adjacently downstream of the electrode unwinding mechanism, the first foil unwinding mechanism and the second foil unwinding mechanism, and one set of tension roller mechanisms is respectively arranged adjacently upstream of the winding mechanism.
[0016] The beneficial effects of this utility model are as follows: This utility model provides a composite current collector welding device. By integrating a drilling mechanism and a glue-applying mechanism into the welding device, the drilling mechanism punches holes while the glue-applying mechanism applies conductive adhesive, allowing the conductive adhesive to penetrate into the holes and effectively reduce the welding wire resistance. Simultaneously, applying conductive adhesive can prevent the foil and electrode from shifting during the welding process. Furthermore, after curing, the conductive adhesive can absorb some pressure during welding, reducing the weld perforation rate. This device reduces light transmittance while ensuring welding strength, improving the overall welding quality of the transfer welding process. In addition, by setting up a welding oven, hot roller, and passing roller at the welding point, this device allows the electrode to be flattened by both temperature and tension during the welding process, improving welding and winding quality. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the composite current collector welding device and its threading mechanism in Example 1;
[0018] Figure 2 This is a schematic diagram of the welding mechanism in Example 1;
[0019] Figure 3 This is a schematic diagram of the welding mechanism in Example 2;
[0020] Figure 4 This is a schematic diagram of the internal structure of the welding mechanism in Example 3;
[0021] Figure 5 This is a schematic diagram of the external structure of the welding mechanism in Example 3;
[0022] Figure 6 This is a schematic diagram of electrode drilling;
[0023] Figure 7 This is a schematic diagram of the wire bonding resistance test method;
[0024] The labels in the attached diagram are as follows: 1. Electrode unwinding mechanism; 2. Foil unwinding mechanism; 21. First foil unwinding mechanism; 22. Second foil unwinding mechanism; 3. Punching mechanism; 31. Needle roller; 32. Dust collection platform; 4. Glue coating mechanism; 5. Welding mechanism; 51. Roll welding ultrasonic welding head; 52. Roll welding welding station; 53. Cleaning component; 54. Welding oven; 541. Top cover; 542. Inlet; 543. Outlet; 544. Observation window; 55. Passing roller; 56. Hot roller; 6. Traction mechanism; 7. Pressing mechanism; 8. Drying mechanism; 9. Rewinding mechanism; 10. Tension roller mechanism; A. Electrode; B1. First foil; B2. Second foil. Detailed Implementation
[0025] The specific embodiments of this utility model will be described below with reference to the accompanying drawings and specific examples.
[0026] Example 1
[0027] like Figure 1 As shown, this embodiment provides a composite current collector welding device, including an electrode unwinding mechanism 1, a foil unwinding mechanism 2, a punching mechanism 3, an adhesive coating mechanism 4, and a welding mechanism 5.
[0028] Electrode unwinding mechanism 1 is used to unwind electrode A. Foil unwinding mechanism 2 includes a first foil unwinding mechanism 21 for unwinding a first foil B1 and a second foil unwinding mechanism 22 for unwinding a second foil B2. The first foil B1 and the second foil B2 output by foil unwinding mechanism 2 are located on both sides of the tab area A1 of electrode A.
[0029] The drilling mechanism 3 is used to drill holes in the tab area A1 of the electrode plate A, with a hole diameter of 0.3-0.7 mm. The adhesive coating mechanism 4 is used to coat the two sides of the tab area A1 after drilling with conductive adhesive, with a coating thickness not exceeding 0.1 mm. The welding mechanism 5 is used to weld the first foil B1 and the second foil B2 to the two sides of the coated tab area A1, respectively.
[0030] The conductive adhesive not only protects the drilled area but also penetrates into the hole, reducing subsequent resistance. Furthermore, after electrode A joins with the first foil B1 and the second foil B2, the conductive adhesive can adhere and fix the first foil B1 and the second foil B2 to the tab area A1 of electrode A, preventing relative displacement during subsequent welding. Moreover, after the conductive adhesive cures, it can absorb some of the pressure from the welding head on the foil and the tab area A1 of electrode A, reducing the occurrence of weld perforations.
[0031] Specifically, both the electrode unwinding mechanism 1 and the foil unwinding mechanism 2 are equipped with a deviation correction device to maintain the straightness of the material conveyor belt.
[0032] The punching mechanism 3 includes a needle roller 31. The needle roller 31 is located on one side of the electrode A output from the electrode unwinding mechanism 1 and can pierce the tab area A1 to form a through hole structure.
[0033] In a preferred embodiment, the punching mechanism 3 further includes a dust collection platform 32. The dust collection platform 32 is disposed below the needle roller 31 and is used to collect dust and debris generated during punching.
[0034] The glue application mechanism 4 can be a glue application equipment such as a glue dispensing machine.
[0035] The device also includes a traction mechanism 6. The traction mechanism 6 is disposed between the glue application mechanism 4 and the welding mechanism 5. The traction mechanism 6 includes two traction rollers arranged opposite each other. The two traction rollers are used to pull the first foil B1 and the second foil B2 to the two sides of the tab area A1 of the electrode sheet A, respectively.
[0036] The device also includes a clamping mechanism 7. The clamping mechanism 7 is disposed between the traction mechanism 6 and the welding mechanism 5. The clamping mechanism 7 includes two opposing pressure rollers, which cooperate to clamp the first foil B1, the electrode A, and the second foil B2 stacked sequentially. The pressure rollers only act on the tab area A1 of the electrode A, and the pressure is less than 20N.
[0037] The device also includes a drying mechanism 8. The drying mechanism 8 is disposed between the pressing mechanism 7 and the welding mechanism 5, and is used to dry the conductive adhesive applied by the adhesive coating mechanism 4. The drying mechanism 8 can be a drying device such as an oven.
[0038] like Figure 2 As shown, the welding mechanism 5 is an ultrasonic welding machine, including an ultrasonic welding head 51 and a welding station 52. The ultrasonic welding head 51 and the welding station 52 are arranged opposite each other on both sides of the first foil B1, the electrode A and the second foil B2 stacked in sequence, for welding the first foil B1 and the second foil B2 to the two sides of the tab area A1 of the electrode A, respectively.
[0039] The device also includes a winding mechanism 9. The winding mechanism 9 is located downstream of the welding mechanism 5 and is used to wind up the composite current collector after welding.
[0040] The device also includes a tension roller mechanism 10. The tension roller mechanism 10 is used to adjust the tension during the winding or unwinding of the composite current collector welding device. The tension roller mechanism 10 includes four sets of tension roller mechanisms. Three sets of tension roller mechanisms are respectively arranged adjacent to each other downstream of the electrode unwinding mechanism 1, the first foil unwinding mechanism 21, and the second foil unwinding mechanism 22. One set of tension roller mechanisms is respectively arranged adjacent to each other upstream of the winding mechanism 9.
[0041] Example 2
[0042] This embodiment provides a composite current collector welding device, which has a structure basically the same as that of Embodiment 1, with the only difference being: Figure 3 As shown, both the ultrasonic welding head 51 and the welding station 52 are equipped with cleaning components 53 that come into contact with their surfaces. The cleaning components 53 wipe alcohol off their surfaces by rolling the ultrasonic welding head 51 / welding station 52. By wiping the surfaces of the ultrasonic welding head 51 / welding station 52 with alcohol, the purpose of cleaning and cooling is achieved, thereby enabling the continuous operation of the welding mechanism 5.
[0043] Specifically, the cleaning component 53 can be an absorbent material such as felt or sponge. The cleaning component 53 is fixed above the ultrasonic welding head 51, with its bottom contacting the surface of the ultrasonic welding head 51. The cleaning component 53 is fixed below the welding station 52, with its top contacting the surface of the welding station 52. The cleaning component 53 is stationary and absorbs alcohol; during the rolling motion of the ultrasonic welding head 51 / welding station 52, the end of the cleaning component 53 in contact with its surface is wiped.
[0044] In a preferred embodiment, the cleaning unit 53 is equipped with an infusion tube, the end of which is inserted into the cleaning unit 53 to deliver alcohol to the cleaning unit 53.
[0045] Example 3
[0046] This embodiment provides a composite current collector welding device, which has a structure basically the same as that of Embodiment 1, with the only difference being: Figure 4 As shown, Figure 4 As shown, the welding mechanism 5 also includes a welding oven 54 and two sets of rollers 55 and hot rollers 56.
[0047] Both the ultrasonic welding head 51 and the welding station 52 are located inside the welding oven 54. The welding oven 54 heats the interior of the electrode to provide a constant temperature for the electrode during the welding process, with a temperature range of 70 to 150°C.
[0048] In a preferred embodiment, the welding oven 54 has a removable top cover 541 to facilitate the threading / connection of the belt inside, and the welding oven 54 has an inlet 542 and an outlet 543 on both sides for feeding the belt.
[0049] like Figure 5 As shown, in another preferred embodiment, the welding oven 54 is provided with an observation window 544 on its side, through which the electrode sheet can be observed in the welding oven 54.
[0050] Two sets of guide rollers 55 and hot rollers 56 are also set inside the welding oven 54, and are respectively set upstream and downstream of the ultrasonic welding head 51 and the welding station 52. The hot rollers 56 are set between the guide rollers 55 and the ultrasonic welding head 51 and the welding station 52. The guide rollers 55 are used to adjust the tension of the electrode before and after welding, and the hot rollers 56 are used to heat the electrode before and after welding. The heating temperature is 70-120℃.
[0051] During electrode welding, the welding oven 54 and the hot roller 56 simultaneously provide heat, while the tension is adjusted by the roller 55, causing the electrode to flatten under the combined action of tension and temperature, ensuring welding quality and consistency. Furthermore, after the electrode is flattened, tension control is more uniform, which is beneficial for subsequent neat winding.
[0052] In one specific embodiment, the needle diameter of the needle roller is 0.5 mm, and the spacing between the needles is 0.5 mm. A schematic diagram of the punching process is shown below. Figure 6 As shown, the tab area A of the electrode to be welded A is 15mm, the perforated area is 1mm from the positive electrode material, and 1.5mm from the edge of the tab area A1. The conductive adhesive used is sodium cocoyl aminopropionate, applied using an oil-based dispensing machine, with the application width 0.5mm wider than the perforated area on both sides. The conductive adhesive is cured in an oven at 100℃. The welding mechanism 5 is a 20kHz, 2500W model, with the following welding parameters: welding head air pressure 0.25MPa, amplitude 50%, and welding speed 10m / min. Figure 7 As shown, during the welding test, the overcurrent resistance of the welding wire can be controlled below 0.2mΩ, the alignment of the first foil B1, the second foil B2 and the electrode tab area A1 of electrode A can be controlled within ±0.5mm, and the light transmittance is less than 10%.
[0053] It should be noted that the terms such as "upper", "lower", "left", "right", "front", and "back" used in this utility model are only for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered as within the scope of implementation of this utility model.
[0054] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A composite current collector welding device, characterized in that: It includes an electrode unwinding mechanism, a foil unwinding mechanism, a punching mechanism, an adhesive coating mechanism, and a welding mechanism; The electrode unwinding mechanism is used to unwind the electrode sheet; The foil unwinding mechanism includes a first foil unwinding mechanism for unwinding a first foil and a second foil unwinding mechanism for unwinding a second foil; The first foil and the second foil output by the foil unwinding mechanism are located on both sides of the tab area of the electrode sheet, respectively; The drilling mechanism is used to drill holes in the tab area of the electrode sheet; The adhesive coating mechanism is used to coat the two sides of the perforated tab area with conductive adhesive. The welding mechanism is used to weld the first foil and the second foil to the two sides of the tab area after adhesive coating.
2. The composite current collector welding device according to claim 1, characterized in that: The punching mechanism includes a needle roller; The needle roller is located on one side of the electrode sheet output by the electrode sheet unwinding mechanism and can pierce the tab area to form a through hole structure.
3. The composite current collector welding device according to claim 2, characterized in that: The drilling mechanism also includes a dust extraction platform; The dust collection platform is located below the needle roller and is used to collect dust and debris generated during drilling.
4. The composite current collector welding device according to claim 1, characterized in that: It also includes a traction mechanism and a clamping mechanism; The traction mechanism is disposed between the glue coating mechanism and the welding mechanism. The traction mechanism includes two traction rollers arranged opposite each other. The two traction rollers are respectively used to pull the first foil and the second foil to the two sides of the tab area of the electrode sheet. The pressing mechanism is disposed between the traction mechanism and the welding mechanism; the pressing mechanism includes two opposing pressure rollers, which cooperate with each other to press the first foil, the electrode sheet and the second foil stacked in sequence.
5. The composite current collector welding device according to claim 4, characterized in that: It also includes a drying mechanism; The drying mechanism is located between the pressing mechanism and the welding mechanism, and is used to dry the conductive adhesive applied by the coating mechanism.
6. The composite current collector welding device according to claim 1, characterized in that: The welding mechanism includes a roller welding ultrasonic welding head and a roller welding station. The roller welding ultrasonic welding head and the roller welding station are arranged opposite each other on both sides of the first foil, the electrode and the second foil stacked in sequence, for welding the first foil and the second foil to the two sides of the tab area of the electrode respectively.
7. The composite current collector welding device according to claim 6, characterized in that: Both the ultrasonic welding head and the ultrasonic welding station are equipped with cleaning components that come into contact with their surfaces. The cleaning components are used to wipe alcohol off the surfaces of the ultrasonic welding head / ultrasonic welding station by rolling.
8. The composite current collector welding device according to claim 6, characterized in that: The welding mechanism also includes a welding oven; Both the ultrasonic welding head and the welding station are located inside the welding oven, which heats the interior of the equipment.
9. The composite current collector welding device according to claim 7, characterized in that: The welding mechanism also includes two sets of guide rollers and hot rollers; Both sets of guide rollers and hot rollers are arranged inside the welding oven, and are respectively located upstream and downstream of the ultrasonic welding head and the welding station. The hot rollers are arranged between the guide rollers and the ultrasonic welding head and the welding station. The guide rollers are used to adjust the tension, and the hot rollers are used for heating.
10. The composite current collector welding device according to claim 1, characterized in that: It also includes a winding mechanism and a tension roller mechanism; The winding mechanism is located downstream of the welding mechanism and is used to wind up the composite current collector after welding. The tension roller mechanism is used to adjust the tension when the composite current collector welding device is winding or unwinding. The tension roller mechanism includes four sets of tension roller mechanisms. Three sets of tension roller mechanisms are respectively arranged adjacent to each other downstream of the electrode unwinding mechanism, the first foil unwinding mechanism and the second foil unwinding mechanism, and one set of tension roller mechanisms is respectively arranged adjacent to each other upstream of the winding mechanism.