Integrated production device for copper-lithium composite strip

Abstract

The utility model discloses copper lithium composite belt integrated production device, include: support structure, set up the first unwinding roller subassembly of support structure middle part, be located the second unwinding roller subassembly and third unwinding roller subassembly of first unwinding roller both sides, be equipped with the first feeding mechanism subassembly between first unwinding roller subassembly and second unwinding roller subassembly, be equipped with second feeding mechanism subassembly in the middle of first unwinding roller and second unwinding roller, be equipped with the film pressing subassembly in the lower part of first unwinding roller, be equipped with the winding roller subassembly in the lower part of film pressing subassembly. The utility model discloses technical scheme compares with prior art, integrates the production process of integration to several scattered processes, solves the problem of composite tape size precision difference, uneven thickness, overcomes the weak point of metal lithium high adhesion, surface rough, at the same time, further improves the yield and preparation efficiency of material preparation.

Description

Technical Field

[0001] This utility model belongs to the field of lithium battery production technology, specifically relating to the production of a lithium battery negative electrode current collector. Background Technology

[0002] Existing processing technologies include lithium metal anode extrusion, rolling, and composite processes, which involve separate production steps. Due to various technical limitations, many companies adopt non-continuous preparation processes. Each step requires manual transfer, which affects production efficiency and yield. Utility Model Content

[0003] To address the aforementioned technical problems, this utility model provides an integrated production device for copper-lithium composite strips.

[0004] An integrated copper-lithium composite strip production device includes: a support structure; a first unwinding roller assembly disposed in the middle of the support structure; a second unwinding roller assembly and a third unwinding roller assembly located on both sides of the first unwinding roller; a first feeding mechanism assembly disposed between the first unwinding roller assembly and the second unwinding roller assembly; a second feeding mechanism assembly disposed between the first unwinding roller and the second unwinding roller; a film pressing assembly disposed below the first unwinding roller; and a take-up roller assembly disposed below the film pressing assembly.

[0005] An integrated copper-lithium composite strip production device is provided. The first feeding mechanism component includes a first roller assembly and a second roller assembly arranged symmetrically in the upper and lower parts. The upper rollers of the first roller assembly and the upper rollers of the second roller assembly are located on the same horizontal plane, and the lower rollers of the first roller assembly and the lower rollers of the second roller assembly are located on the same horizontal plane.

[0006] An integrated production device for copper-lithium composite strips is provided, wherein the first feeding component includes a first roller assembly.

[0007] An integrated production device for copper-lithium composite strip is provided. The first roller assembly includes four rollers, which are respectively located between the upper and lower rollers of the first roller assembly and the second roller assembly. The four rollers are located on the same horizontal plane.

[0008] An integrated copper-lithium composite strip production device is provided. The second feeding component includes a third roller assembly and a fourth roller assembly arranged symmetrically in the upper and lower parts. The upper rollers of the third roller assembly and the fourth roller assembly are located on the same horizontal plane, and the lower rollers of the third roller assembly and the fourth roller assembly are located on the same horizontal plane.

[0009] An integrated production apparatus for copper-lithium composite strips is provided, wherein the second feeding mechanism component includes a second roller assembly.

[0010] An integrated production device for copper-lithium composite strip is provided. The second roller assembly includes four rollers, which are located between the upper and lower rollers of the third and fourth roller assemblies, respectively, and the four rollers are located on the same horizontal plane.

[0011] An integrated production apparatus for copper-lithium composite strips is provided, wherein the pressing assembly is located below the first unwinding roller assembly and includes two pressing roller assemblies arranged symmetrically on the left and right.

[0012] An integrated production apparatus for copper-lithium composite strip is provided, wherein the winding roller assembly includes a first winding roller assembly and a second winding roller assembly, which are located on the left and right sides of the pressure roller assembly, respectively.

[0013] An integrated production apparatus for copper-lithium composite strip is provided, wherein a third overpass assembly is provided between the pressing assembly and the first unwinding roll assembly, and a fourth overpass assembly is provided between the pressure roll assembly and the second winding roll assembly.

[0014] Compared with the prior art, this utility model integrates several scattered processes into an integrated production process; it solves the problems of poor dimensional accuracy and uneven thickness of composite strips, and overcomes the weaknesses of high adhesion and rough surface of lithium metal; at the same time, it further improves the yield and preparation efficiency of materials. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the integrated processing device for copper-lithium composite strips according to this utility model.

[0016] Figure 2 This is an exploded view of the structure of the first unwinding roller assembly of this utility model.

[0017] Figure 3 This is a schematic diagram of the power mechanism of the first unwinding roller assembly of this utility model.

[0018] Figure 4 This is a schematic diagram of the fastener structure of the gear mechanism of the first unwinding roller assembly of this utility model.

[0019] Figure 5 This is a schematic diagram of the rotating shaft structure of the first unwinding roller assembly of this utility model.

[0020] Figure 6 This is a schematic diagram of the fastener structure of the rotating shaft of the first unwinding roller assembly of this utility model.

[0021] Figure 7 This is a schematic diagram of the structure of the first and second feeding components of this utility model.

[0022] Figure 8 This is a schematic diagram of the structure of the film pressing assembly and the winding roller assembly of this utility model.

[0023] 100. Support structure; 200. First unwinding roll assembly; 210. Power unit; 211. Motor assembly; 2111. Motor; 2112. Motor mounting bracket; 2113. First gear mechanism; 21131. Fastener for the first gear mechanism; 2114. Second gear mechanism; 212. Rotating rod; 2121. Rotating shaft; 2122. Connecting shaft; 21221. Elliptical hole; 21222. Tensioning element; 212221. Fixing hole; 212222. Roller; 21223. Cut surface; 220. Roller body; 300. 400. Second unwinding roll assembly; 500. Third unwinding roll assembly; 500. First feeding mechanism assembly; 510. First feeding mechanism roller assembly; 511. First roller assembly; 5111. First roller of first roller assembly; 5112. Second roller of first roller assembly; 512. Second roller assembly; 5121. First roller of second roller assembly; 5122. Second roller of second roller assembly; 520. First guide roller assembly; 521. First guide roller assembly first guide roller mechanism; 522. First guide roller assembly second guide roller mechanism; 523. First roller assembly, third roller mechanism; 524. First roller assembly, fourth roller mechanism; 600. Second feeding mechanism assembly; 610. Second feeding mechanism roller assembly; 611. Second feeding mechanism roller assembly, first roller assembly; 6111. Second feeding mechanism roller assembly, first roller assembly, first roller; 6112. Second feeding mechanism roller assembly, first roller assembly, second roller; 612. Second feeding mechanism roller assembly, second roller assembly; 6121. Second feeding mechanism roller assembly, second roller assembly, third roller assembly... 6122, Second feeding mechanism roller assembly; 620, Second feed roller assembly; 621, Second feed roller assembly first feed roller mechanism; 622, Second feed roller assembly second feed roller mechanism; 6623, Second feed roller assembly third feed roller mechanism; 624, Second feed roller assembly fourth feed roller mechanism; 700, Film pressing assembly; 710, Film pressing assembly first feed roller; 720, Film pressing assembly second feed roller; 800, Take-up roller assembly; 810, First take-up roller assembly; 820, Second take-up roller assembly; Detailed Implementation

[0024] The following is combined with Figures 1-7 The technical solution of this utility model has been clearly and completely described. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as being "connected to" another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "vertical," "horizontal," "left," "right," "front," "back," and similar expressions used in this specification are for illustrative purposes only.

[0026] A copper-lithium composite strip production apparatus, characterized in that it comprises: a support structure 100, a first unwinding roller assembly 200 disposed in the middle of the support structure, a second unwinding roller assembly 300 and a third unwinding roller assembly 400 located on both sides of the first unwinding roller assembly 200, a first feeding mechanism assembly 500 disposed between the first unwinding roller and the second unwinding roller, and a second feeding mechanism assembly 600 disposed between the first unwinding roller and the second unwinding roller; a film pressing assembly 700 disposed below the first unwinding roller, and a take-up roller assembly 800 disposed below the film pressing assembly 700.

[0027] Support structure 100, the technical solution of this utility model, the support structure is a vertical cuboid plate-shaped structure.

[0028] The first unwinding roller assembly 200 includes a power unit 210 and a roller body 220. The power unit 210 includes a motor assembly 211 and a rotating rod 212. The rotating rod 212 is fixed to the power output part of the motor assembly 211 and has multiple positions located at the middle and slightly above the support structure. The power unit is connected to the first unwinding roller assembly 200 and is located on the other side of the support structure 100.

[0029] The motor assembly 211 includes a motor 2111 and a mounting bracket 2112 for fixing the motor. The motor mounting bracket 2112 includes upper and lower layers. The motor 2111 is located in the lower layer of the mounting bracket. A first gear mechanism 2113 is provided at the power output end of the motor, and a second gear mechanism 2114 is provided in the upper layer of the mounting bracket. The first gear mechanism 2113 and the second gear mechanism 2114 are connected by a belt or chain. The second gear mechanism 2114 is connected to the rotating rod 212. When the motor rotates, the power is transmitted to the rotating rod through belt drive or chain drive.

[0030] The first gear mechanism 2113 includes a fastener 21131, which includes a locking part 211311 connected to the center of the first gear mechanism and a force-receiving part 211312 with a circular recess in the center that rotates under external force.

[0031] The rotating rod 212 includes a rotating shaft 2121 and a connecting shaft 2122. The rotating shaft 2121 has a recess 21211 near its end for fixed connection. The connecting shaft 2122 is fixedly connected to the rotating shaft 2121 by fasteners. The connecting shaft 2122 has multiple generally elliptical holes 21221, each with a fixing hole for fixing a tensioning member 21222 of the roller body 220. The roller body 220 is fixed to the connecting shaft 2122 by the tensioning member. The connecting shaft 2122 has multiple axially oriented cut surfaces 21223 evenly distributed on it, with fixing holes at both ends of each cut surface.

[0032] The tensioning member 21222 includes fixing holes 212221 at both ends and a rolling wheel 212222 at the middle. The top of the rolling wheel 212222 is higher than the surface of the connecting shaft 2122, forming a protrusion.

[0033] When the roller body 220 extends into the connecting shaft 2122, the rolling wheel 212222 on the tensioning member 21222 can rotate to facilitate the smooth extension of the roller body 220. When the preset position is reached, the protrusion of the rolling wheel 212222 can also play a role in clamping and fixing.

[0034] The second unwinding roller assembly 300 is located on the upper left side of the support structure 100. Its structure is exactly the same as that of the first unwinding roller assembly, and will not be described in detail here.

[0035] A first feeding mechanism assembly 500 is provided between the second unwinding roller assembly 300 and the first unwinding roller assembly 200. The first feeding mechanism assembly 500 includes multiple sets of vertically symmetrical roller assemblies 510 and multiple roller passing assemblies 520.

[0036] The roller assembly 510 includes a first roller assembly 511 and a second roller assembly 512. The first roller assembly 511 includes a first roller 5111 located at the upper part and a second roller 5112 located at the lower part; the axes of the first roller 5111 and the second roller 5112 are parallel to each other and located on the same vertical plane, meaning the first roller 5111 and the second roller 5112 are symmetrically arranged vertically. The second roller assembly 512 includes a first roller 5121 located at the upper part and a second roller 5122 located at the lower part; the axes of the first roller 5121 and the second roller 5122 are parallel to each other and located on the same vertical plane, meaning the first roller 5121 and the second roller 5122 are symmetrically arranged vertically.

[0037] In this technical solution, the roller guide assembly 520 includes four roller guide mechanisms. A first roller guide mechanism 521 is located between the second unwinding roller assembly 300 and the first roller assembly 511. A second roller guide mechanism 522 is located between the first roller assembly 511 and the second roller assembly 512. A third roller guide mechanism 523 and a fourth roller guide mechanism 524 are located between the second roller guide mechanism 512 and the first unwinding roller assembly 200. The axes of roller guide mechanisms 521, 522, 523, and 524 are located on the same horizontal plane, and the axial radii of these four roller guide mechanisms are the same. A detection mechanism 530 is located above the middle position of roller guide mechanisms 523 and 524. The detection mechanism 530 determines the tension by judging the bending state of the lithium metal strip and transmits the information to the control system for the operator to adjust the tension.

[0038] The second unwinding roller assembly 400 is located on the upper right side of the support structure 100. Its structure is exactly the same as that of the first unwinding roller assembly, and will not be described in detail here.

[0039] A second feeding mechanism assembly 600 is provided between the third unwinding roller assembly 400 and the first unwinding roller assembly 200. The second feeding mechanism assembly 600 includes multiple sets of vertically symmetrical roller assemblies 610 and multiple roller passing assemblies 620.

[0040] The roller assembly 610 includes a first roller assembly 611 and a second roller assembly 612. The first roller assembly 611 includes a first roller 6111 located at the upper part and a second roller 6112 located at the lower part; the axes of the first roller 6111 and the second roller 6112 are parallel to each other and located on the same vertical plane, meaning the first roller 6111 and the second roller 6112 are symmetrically arranged vertically. The second roller assembly 612 includes a first roller 6121 located at the upper part and a second roller 6122 located at the lower part; the axes of the first roller 6121 and the second roller 6122 are parallel to each other and located on the same vertical plane, meaning the first roller 6121 and the second roller 6122 are symmetrically arranged vertically.

[0041] In this technical solution, the roller guide assembly 620 includes four roller guide mechanisms. A first roller guide mechanism 621 is located between the third unwinding roller assembly 400 and the first roller assembly 611; a second roller guide mechanism 622 is located between the first roller assembly 611 and the second roller assembly 612; and a third roller guide mechanism 623 and a fourth roller guide mechanism 624 are located between the second roller guide mechanism 612 and the first unwinding roller assembly 200. The axes of roller guide mechanisms 621, 622, 623, and 624 are located on the same horizontal plane, and the axial radii of these four roller guide mechanisms are the same. A detection mechanism 630 is located above the middle position of roller guide mechanisms 623 and 624. The detection mechanism 630 determines the tension by judging the bending state of the lithium metal strip and transmits the information to the control system for the operator to adjust the tension.

[0042] The film pressing assembly 700 is located below the first unwinding roller assembly 200, and a guide roller 710 is provided between the first unwinding roller assembly 200 and the film pressing assembly 700. The guide roller 710 is located at a position slightly to the right of the middle of the lower part of the first unwinding roller assembly 200. A guide roller 720 is provided at the lower part of the film pressing assembly 700.

[0043] The take-up roll assembly 800 includes a first take-up roll mechanism 810 and a second take-up roll mechanism 820. The first take-up roll mechanism 810 is located below the second unwind roll assembly 300. The second take-up roll mechanism 820 is located below the third unwind roll assembly 400.

[0044] A roll of copper foil is placed on the first unwinding roller assembly 200, and a roll of lithium metal strip is placed on the second unwinding roller assembly 300 and the third unwinding roller assembly 400, respectively. When the equipment is operating, the first unwinding roller assembly 200, the second unwinding roller assembly 300, and the third unwinding roller assembly 400 simultaneously feed lithium metal material towards the center position. At the film pressing assembly 700, after film pressing, a copper-lithium composite strip is formed with lithium metal at the top and bottom and copper foil in the middle. The first take-up roller mechanism 810 winds up and packages the formed copper-lithium composite strip.

[0045] To facilitate a clearer and more accurate understanding of the technical solution of this application by relevant technical personnel, the working principle / process of this application is explained below:

[0046] In the production of copper-lithium composite strip, the ultra-thin lithium strip 501 produced by the first feeding mechanism assembly 500, i.e., the lithium strip extruder 500, is preheated before conveying the lithium strip. The preheating time is within 30 minutes, and the preheating temperature is controlled between 20℃ and 50℃. The original thickness of the lithium strip is approximately 800μm-1600μm, usually 1500μm. After two pressings by the two sets of roller assemblies of the first unwinding roller assembly, the pressure is adjusted by a pressure sensor, ranging from 500KPa to 5000KPa. After the first pressing, the thickness of the lithium strip is 300μm-600μm, usually 500μm. The second pressing... Afterwards, the thickness of the lithium strip is 10μm-100μm, typically 20μm. The copper strip 201 output from the copper strip unwinding device 200 has a thickness of 3μm-10μm, commonly 6μm. The ultra-thin lithium strip 601 produced by the second feeding mechanism assembly 600, which is the lithium strip extruder 600, is preheated before being conveyed by the first feeding mechanism assembly. The preheating temperature is controlled between 20℃ and 50℃. The original thickness of the lithium strip is approximately 800μm-1600μm, typically 1500μm. After being pressed twice by the two sets of roller assemblies of the first unwinding roller assembly, the pressure is adjusted by a pressure sensor. The pressure of the first set is 500KPa-50KPa. At 00 kPa, after the first set of rollers presses, the thickness of the lithium strip is 300 μm-600 μm; after the second set of rollers presses, the thickness of the lithium strip is approximately 10 μm-100 μm, typically 20 μm. Simultaneously, it is drawn to the copper-lithium composite strip pressing assembly 700. The first pressure roller 730 and the second pressure roller 740 press the lithium strip 501, copper strip 201, and lithium strip 601. After pressing by the first pressure roller 730 and the second pressure roller 740, the thickness of the produced copper-lithium composite strip is approximately 20-106 μm, preferably 46 μm. The pressure of the rollers is approximately 100 kPa-500 kPa. The tension detection assembly 5 is located upstream of the pressing assembly 700. The tension detection component 630 and the tension detection component 630 can detect the tension of the ultra-thin lithium strip 501 and ultra-thin lithium strip 601 during the winding process. In this embodiment, the tension component is a laser detection device. The tension is determined by the vertical distance of the lithium strip during horizontal transmission. The control unit can obtain the tension data to determine whether the tension of the lithium strip 501 and lithium strip 601 is too high or too low. Then, the control unit adjusts the vertical position of the copper-lithium composite strip winding device to adjust the traction force on the lithium strip 501 and lithium strip 601 so that the traction force meets the requirements, thereby effectively preventing the lithium strip 501 and lithium strip 601 from being broken.

[0047] Taking one specific implementation as an example, this embodiment includes two copper-lithium composite strip winding mechanisms. The winding direction of the copper-lithium composite strip winding mechanism 810 is counterclockwise. If the tension of the lithium strip 501 or 601 is too high, the driving device can reduce the traction force on the lithium strip 501 or 601. If the tension of the lithium strip 501 or 601 is too low, the driving device can increase the traction force on the lithium strip 501 and 601. The winding device 820 is an optional installation device, and 820 can coat the copper-lithium composite strip of the winding roller 810 with a film.

[0048] Ultra-thin lithium metal foils are continuously produced using multi-stage lithium metal extrusion molding technology. Since the copper-lithium composite strip has a three-layer structure—a copper foil in the middle and lithium metal on the top and bottom—a simultaneous fabrication technology using a middle copper foil and two lithium foils on the top and bottom is employed to composite the copper-lithium composite strip in the middle. The raw materials for this method are lithium metal ingots or lithium metal strips, the copper foil is battery-grade copper foil, and the finished product is a lithium metal anode material for solid-state batteries.

[0049] Due to its high chemical reactivity, high creep, low strength, poor ductility, and tendency to adhere to other materials, lithium metal exhibits poor fabrication continuity. Traditional fabrication techniques are often discontinuous, and the lithium metal surface is prone to oxidation during long-term storage, resulting in weak adhesion to copper foil and composite failure. A surface improvement scheme was introduced to reduce the surface energy of lithium metal and decrease adhesion. Furthermore, because lithium foil is weak and prone to breakage, a tension-free control technique was used to ensure fabrication continuity.

[0050] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0051] The above embodiments are preferred embodiments of the present utility model. The present utility model is not limited to the above embodiments. For those skilled in the art, any obvious modifications made without departing from the technical principles of the present utility model shall fall within the concept and protection scope of the appended claims of the present utility model.

Claims

1. An integrated production device for copper-lithium composite strips, characterized in that... include: The support structure includes a first unwinding roller assembly located in the middle of the support structure, a second unwinding roller assembly and a third unwinding roller assembly located on both sides of the first unwinding roller assembly, a first feeding mechanism assembly located between the first unwinding roller assembly and the second unwinding roller assembly, and a second feeding mechanism assembly located between the first unwinding roller assembly and the second unwinding roller assembly; a film pressing assembly located below the first unwinding roller assembly, and a take-up roller assembly located below the film pressing assembly.

2. The integrated copper-lithium composite strip production device according to claim 1, characterized in that: The first feeding mechanism assembly includes a first roller assembly and a second roller assembly arranged symmetrically in the upper and lower parts. The upper rollers of the first roller assembly and the upper rollers of the second roller assembly are located on the same horizontal plane, and the lower rollers of the first roller assembly and the lower rollers of the second roller assembly are located on the same horizontal plane.

3. The integrated copper-lithium composite strip production device according to claim 2, characterized in that: The first feeding mechanism assembly includes a first roller assembly.

4. The integrated copper-lithium composite strip production device according to claim 3, characterized in that: The first roller assembly includes four rollers, which are located between the upper and lower rollers of the first roller assembly and the second roller assembly, respectively, and the four rollers are located on the same horizontal plane.

5. The integrated copper-lithium composite strip production device according to claim 1, characterized in that: The second feeding mechanism assembly includes a third roller assembly and a fourth roller assembly arranged symmetrically in the upper and lower parts. The upper rollers of the third roller assembly and the fourth roller assembly are located on the same horizontal plane, and the lower rollers of the third roller assembly and the fourth roller assembly are located on the same horizontal plane.

6. The integrated copper-lithium composite strip production device according to claim 5, characterized in that: The second feeding mechanism assembly includes a second roller assembly.

7. The integrated copper-lithium composite strip production device according to claim 6, characterized in that: The second roller assembly includes four rollers, which are located between the upper and lower rollers of the third and fourth roller assemblies, respectively, and the four rollers are located on the same horizontal plane.

8. The integrated copper-lithium composite strip production device according to claim 1, characterized in that: The pressing assembly is located below the first unwinding roller assembly and includes two pressing roller assemblies arranged symmetrically on the left and right.

9. The integrated copper-lithium composite strip production device according to claim 1, characterized in that: The take-up roller assembly includes a first take-up roller assembly and a second take-up roller assembly, which are located on the left and right sides of the pressure roller assembly, respectively.

10. The integrated copper-lithium composite strip production device according to claim 9, characterized in that: A third guide roller assembly is provided between the pressure roller assembly and the first unwinding roller assembly, and a fourth guide roller assembly is provided between the pressure roller assembly and the second winding roller assembly.

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