Manufacturing method and device of copper-lithium composite foil

Abstract

The invention discloses a manufacturing method and device of a copper-lithium composite foil, and particularly relates to the technical field of solid-state battery negative electrode preparation, the copper-lithium composite foil comprises a supporting assembly, a copper foil, a rolling assembly, an adjusting assembly and a cleaning assembly, the supporting assembly comprises a base, a support is arranged above the base, and the rolling assembly comprises a modeling assembly; the shaping assembly comprises two driving rollers which are symmetrically arranged up and down in the same vertical plane, the vertical plane passes through the axes of the two driving rollers, an annular rolling belt is arranged on the outer sides of the driving rollers in a transmission mode, a micro-shaping covering piece is arranged on the outer surface of the annular rolling belt, and the annular rolling belt is horizontally arranged in the middle of the support. According to the invention, the micro-modeled copper foil is used as a current collector base material, and a very thin lithium metal layer can be plated on the surface of the copper foil in a vacuum evaporation manner, so that enough stripping force between a lithium strip and the copper foil is ensured, and the production cost is effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of preparation of anodes of solid-state batteries, and more specifically, to a method and device for preparing a copper-lithium composite foil. Background Art

[0002] As a representative of the next generation of energy storage technology, solid-state batteries have received widespread attention in recent years. Compared with traditional liquid batteries, solid-state batteries use solid electrolytes, and their biggest advantages are high safety and high energy density. Therefore, solid-state batteries have great application potential in electric vehicles and energy storage systems.

[0003] At present, in laboratories and small-scale production, solid-state batteries use metallic lithium as the negative electrode. When the battery is a laminated type, lithium foil can be directly used as the negative electrode. The thickness of the lithium foil is between 20μm and 100μm. As the area of ​​the electrode increases, the thickness of the lithium foil increases, making it easier for the suction claw to absorb the lithium foil, and the lithium foil will not deform significantly. When the battery is a wound type, because the lithium foil is easily broken and deformed under tension, the lithium strip and copper foil are often compounded together to form a lithium-copper composite strip to improve the tensile strength;

[0004] Because lithium is a rare metal, the cost of lithium foil of 20μm to 100μm is high. Therefore, whether it is a laminated battery or a wound battery, the composite of lithium foil and copper foil is a topic that needs to be studied in order to reduce costs and improve tensile strength. Among them, micro-shaping the surface of the copper foil to increase the bonding force between the lithium strip and the copper foil is one of the effective methods to improve the peeling force between the lithium strip and the copper foil.

[0005] However, the existing copper foil micro-modeling technology still has many shortcomings in actual use. For example, when the roller used for micro-modeling copper foil is rolling the copper foil, the tiny debris falling from the surface of the copper foil may be compacted in the micro-modeling texture on the surface of the roller, causing the micro-modeling texture to become shallower, and then causing the micro-modeling protrusions on the surface of the copper foil to become lower, so as to weaken the peeling force between the lithium strip and the copper foil; in order to avoid this situation, the existing technology usually uses high-pressure air flow impact or rotating brush brushing to continuously clean the roller surface during operation. However, due to the close distance between the copper foil and the roller, the cleaned copper scraps may splash onto the surface of the copper foil due to the force and adhere to it. Since the copper scraps are conductive, if these scraps are free inside the battery, they may form an unexpected conductive path inside the battery. Especially during the lamination or winding process of the battery, the debris may pass through the diaphragm and contact the adjacent positive and negative electrodes, causing an internal short circuit. Summary of the invention

[0006] The present invention provides a method and device for manufacturing a copper-lithium composite foil, and aims to solve the problem that in the existing copper foil micro-molding technology, copper chips cleaned from the roller surface may splash onto the copper foil surface due to force and adhere to it, and the copper chips may form an unexpected conductive path inside the battery, thereby causing a short circuit inside the battery.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a copper-lithium composite foil manufacturing device, comprising a support component, a copper foil, a rolling component, an adjustment component and a cleaning component, the support component comprising a base, a bracket is arranged above the base, the rolling component comprises a shaping component, the shaping component comprises two driving rollers symmetrically arranged in the same vertical plane, the vertical plane passes through the axis of the two driving rollers, an annular rolling belt is driven on the outer side of the driving roller, and a micro-modeling cover is arranged on the outer surface of the annular rolling belt, the annular rolling belt is horizontally arranged in the middle position of the bracket, a driven shaft is arranged on the opposite side of the bracket, a driving roller and two driven shafts are laminated on the inner side of a single annular rolling belt, so that the cross section of the annular rolling belt is triangular, and a rolling zone is between the two annular rolling belts. When the copper foil passes through the rolling zone, the two annular rolling belts roll micro-modeling pits and protrusions on the surface of the copper foil;

[0008] The cleaning component includes two isolation covers, which are respectively arranged on the side of the corresponding annular roller belt away from the copper foil, and the opening of the isolation cover faces the corresponding annular roller belt. The isolation cover is fixedly arranged on the opposite side of the bracket, and the inner side of the isolation cover is sequentially provided with a high-pressure air nozzle and a vacuum exhaust pipe along the rotation direction of the annular roller belt. The high-pressure air nozzle is externally connected to a high-pressure air pump for cleaning up the copper chips compacted in the micro-shaped texture of the annular roller belt, and the vacuum exhaust pipe is externally connected to a vacuum dust pump for sucking away the cleaned copper chips.

[0009] In a preferred embodiment, the rolling assembly also includes two sets of driving assemblies for driving the annular rolling belt to rotate. A fixed platform and a lifting platform are arranged above the base. The bracket is located in the middle position of the base, and the lifting platform and the fixed platform are respectively located on the left and right sides of the bracket, and the two sets of driving assemblies are respectively located on the top of the lifting platform and the fixed platform.

[0010] In a preferred embodiment, the driving assembly includes a motor and a gear box matched with the motor, and driving shafts are fixedly provided at both ends of the driving roller, and one of the driving shafts is fixedly connected to the output shaft of the corresponding gear box.

[0011] In a preferred embodiment, a hydraulic cylinder is fixedly installed on the top of the bracket, and a lifting groove with an opening upward is provided on the top of the bracket, a mounting seat is sliding up and down in the lifting groove, two driving shafts located above are rotatably connected to the corresponding mounting seats, and the output end of the hydraulic cylinder is fixedly connected to the corresponding mounting seat.

[0012] In a preferred embodiment, the adjustment component includes two pushing components, and the two pushing components are symmetrically arranged on the left and right sides of the annular roller belt located above. A tensioning wheel is provided at the output end of the pushing component, and the tensioning wheel is in contact with the upper surface of the annular roller belt. When the tensioning wheel is pressed downward, the upper surface of the annular roller belt located above is pressed downward.

[0013] In a preferred embodiment, the pushing component is an electric push rod or a hydraulic push rod, a first slider is fixedly provided at the output end of the electric push rod, and the tensioning wheel is rotatably provided on a side of the first slider close to the corresponding annular roller belt.

[0014] In a preferred embodiment, a mounting plate is fixedly provided on the opposite side of the bracket, the electric push rod is fixedly connected to the mounting plate, a linear guide groove is fixedly provided on the bottom of the mounting plate, a guide rod is fixedly provided on the side of the first slider close to the linear guide groove, and the guide rod slides in the corresponding linear guide groove.

[0015] In a preferred embodiment, a limiting groove is symmetrically provided in the front and rear portions of the upper portion of the bracket, a limiting rod is horizontally arranged in the limiting groove, a second slider and a spring are slidably arranged on the limiting rod, the two springs on the same bracket are respectively located on opposite sides of the two corresponding second sliders, and the two ends of the two driven shafts located above are respectively fixedly connected to the corresponding second sliders.

[0016] In a preferred embodiment, a gap is reserved between the side of the insulating cover close to the corresponding annular rolling belt and the corresponding micro-shaped cover, and the distance of the reserved gap is artificially determined to prevent the insulating cover from damaging the surface texture of the micro-shaped cover.

[0017] A method for manufacturing a copper-lithium composite foil comprises the following steps:

[0018] Step 1: Processing the copper foil through a rolling assembly for micro-molding, so that the copper foil surface is evenly distributed with protrusions and pits;

[0019] Step 2: Plating lithium on the surface of the micro-shaped copper foil through a vacuum evaporation machine to obtain a copper-lithium composite foil;

[0020] Step 3: Take a sample from the copper-lithium composite foil and use a tensile testing machine to test the peeling force between the lithium tape and the copper foil on the sample.

[0021] The beneficial effects of the present invention are as follows: the present invention adopts micro-shaped copper foil as the current collector substrate, and a very thin lithium metal layer can be plated on the surface of the copper foil by vacuum evaporation, while ensuring that there is sufficient peeling force between the lithium strip and the copper foil, thereby effectively reducing the production cost; by arranging a cleaning component in conjunction with a rolling component, the problem that copper chips cleaned from the roller surface may splash onto the copper foil surface and adhere to it due to force in the existing copper foil micro-shaped technology is effectively solved, thereby reducing the probability of internal short circuit in the battery and significantly improving the safety of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional schematic diagram of the present invention.

[0023] Figure 2 It is a front view structural schematic diagram of the rolling assembly part of the present invention.

[0024] Figure 3 It is a schematic structural diagram of the support part of the present invention.

[0025] Figure 4 It is a schematic diagram of the three-dimensional structure of the rolling assembly of the present invention in a partially unpressurized state.

[0026] Figure 5 It is a schematic side view of the structure of the annular roller belt of the present invention in an unpressed state.

[0027] Figure 6 It is a schematic diagram of the three-dimensional structure of the rolling assembly of the present invention after being partially compressed.

[0028] Figure 7 It is a side structural schematic diagram of the annular roller belt of the present invention after being compressed.

[0029] Figure 8 It is a schematic diagram of the structure of the cleaning component part of the present invention.

[0030] Fig. 9 It is a schematic diagram of the structure of the regulating component part of the present invention.

[0031] Fig.10 It is a schematic structural diagram of part A of the present invention.

[0032] Fig.11 The present invention is a flow chart of the method for producing the copper-lithium composite foil.

[0033] Fig.12 This is a surface morphology diagram of the micro-shaped copper foil of the present invention.

[0034] Fig.13 It is a size diagram of the concave and convex points on the surface of the copper foil of the present invention.

[0035] The accompanying drawings are marked as follows: 1. support assembly; 2. copper foil; 3. rolling assembly; 4. adjustment assembly; 5. cleaning assembly; 11. base; 12. fixed table; 13. lifting table; 14. bracket; 15. hydraulic cylinder; 16. lifting slot; 17. mounting seat; 31. modeling assembly; 311. drive shaft; 312. drive roller; 313. annular rolling belt; 314. micro-modeling cover; 315. driven shaft; 32. drive assembly; 321. motor; 322. gear box; 41. mounting plate; 42. pushing assembly; 43. first slider; 44. tensioning wheel; 45. linear guide groove; 46. guide rod; 47. limit groove; 48. limit rod; 49. second slider; 410. spring; 51. isolation cover; 52. high-pressure air nozzle; 53. vacuum exhaust pipe. DETAILED DESCRIPTION

[0036] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0037] Refer to the instruction manual Figures 1 to 10 A copper-lithium composite foil manufacturing device includes a support component 1, a copper foil 2, a rolling component 3, an adjustment component 4 and a cleaning component 5. The support component 1 includes a base 11, a bracket 14 is arranged above the base 11, the rolling component 3 includes a shaping component 31, and the shaping component 31 includes two driving rollers 312 symmetrically arranged in the same vertical plane, the vertical plane passes through the axis of the two driving rollers 312, and an annular rolling belt 313 is driven on the outer side of the driving roller 312, and the annular rolling belt 313 is The outer surface is provided with a micro-shaped covering 314, the annular rolling belt 313 is horizontally arranged in the middle position of the bracket 14, and the opposite side of the bracket 14 is provided with a driven shaft 315. The inner side of the single annular rolling belt 313 is provided with a driving roller 312 and two driven shafts 315, so that the cross section of the annular rolling belt 313 is triangular. The rolling area is between the two annular rolling belts 313. When the copper foil 2 passes through the rolling area, the two annular rolling belts 313 roll the surface of the copper foil 2 into micro-shaped pits and protrusions.

[0038] The cleaning assembly 5 includes two isolation covers 51, which are respectively arranged on the side of the corresponding annular roller belt 313 away from the copper foil 2, and the opening of the isolation cover 51 faces the corresponding annular roller belt 313. The isolation cover 51 is fixedly arranged on the opposite side of the bracket 14, and the inner side of the isolation cover 51 is sequentially provided with a high-pressure air nozzle 52 and a vacuum exhaust pipe 53 along the rotation direction of the annular roller belt 313. The high-pressure air nozzle 52 is externally connected to a high-pressure air pump for cleaning up the copper chips compacted in the micro-shaped texture of the annular roller belt 313, and the vacuum exhaust pipe 53 is externally connected to a vacuum dust pump for sucking away the cleaned copper chips.

[0039] It should be noted that: according to the rotation direction, the portion of the outer surface of the annular roller belt 313 with copper chips attached will first move below the high-pressure air nozzle 52 , and the copper chips will fall off due to the impact of the high-pressure airflow and then be sucked away by the vacuum exhaust pipe 53 .

[0040] Refer to the instruction manual Figure 1 In this embodiment, the rolling assembly 3 also includes two sets of driving assemblies 32 for driving the annular rolling belt 313 to rotate. A fixed platform 12 and a lifting platform 13 are arranged above the base 11. The bracket 14 is located in the middle position of the base 11, and the lifting platform 13 and the fixed platform 12 are respectively located on the left and right sides of the bracket 14. The two sets of driving assemblies 32 are respectively located on the top of the lifting platform 13 and the fixed platform 12.

[0041] It should be noted that: by providing the lifting platform 13, the height of the corresponding driving assembly 32 can be adjusted in coordination with the annular rolling belt 313 located above, so that the device can be adapted to process copper foils 2 of different thicknesses.

[0042] Refer to the instruction manual Figure 1 In this embodiment, the driving assembly 32 includes a motor 321 and a gear box 322 matched with the motor 321. Both ends of the driving roller 312 are fixedly provided with driving shafts 311, and one of the driving shafts 311 is fixedly connected to the output shaft of the corresponding gear box 322.

[0043] It should be noted that: by providing two sets of driving components 32 to separately drive a single driving roller 312 , the height of the annular roller belt 313 located above can be conveniently adjusted, and the rotation direction of the two driving rollers 312 can be more conveniently controlled.

[0044] Refer to the instruction manual Figure 1 and Figure 3In this embodiment, a hydraulic cylinder 15 is fixedly arranged on the top of the bracket 14, and a lifting groove 16 with an opening facing upward is arranged on the top of the bracket 14, and a mounting seat 17 is arranged in the lifting groove 16 to slide up and down, and the two driving shafts 311 located above are rotatably connected to the corresponding mounting seats 17, and the output end of the hydraulic cylinder 15 is fixedly connected to the corresponding mounting seat 17.

[0045] It should be noted that by providing a mounting seat used in conjunction with the lifting slot 16 , the overall stability of the device can be improved, thereby effectively ensuring the processing accuracy.

[0046] Refer to the instruction manual Figures 4 to 7 and Figures 9 and 10 In this embodiment, the adjustment component 4 includes two pushing components 42, and the two pushing components 42 are symmetrically arranged on the left and right sides of the annular roller belt 313 located above. A tensioning wheel 44 is provided at the output end of the pushing component 42, and the tensioning wheel 44 is in contact with the upper surface of the annular roller belt 313. When the tensioning wheel 44 is pressed downward, the upper surface of the annular roller belt 313 located above is pressed downward.

[0047] It should be noted that: by pressing down the tensioning wheel 44, the upper surface of the annular roller belt 313 located above is recessed downward, so that the surface tension of any position of the annular roller belt 313 is increased when it rotates and passes under the high-pressure air nozzle 52. The surface of the annular roller belt 313 with higher tension will produce relatively small buffer deformation when blown by the high-pressure airflow, thereby further improving the surface cleaning effect of the annular roller belt 313; the annular roller belt 313 located below is easier to clean due to gravity, and the cleaned copper chips are easier to be sucked away, so there is no need to set up an adjustment mechanism, which effectively reduces the equipment cost.

[0048] Refer to the instruction manual Figure 7 and Fig.10 In this embodiment, the pushing component 42 is an electric push rod or a hydraulic push rod, and a first slider 43 is fixedly provided at the output end of the electric push rod. The tensioning wheel 44 is rotatably provided on one side of the first slider close to the corresponding annular roller belt 313.

[0049] It should be noted that the rotatable tension wheel 44 can reduce the friction between the tension wheel 44 and the annular roller belt 313 , thereby extending the service life of the annular roller belt 313 .

[0050] Refer to the instruction manual Figure 1 , Figure 4 and Fig.10In this embodiment, a mounting plate 41 is fixedly provided on the opposite side of the bracket 14, the electric push rod is fixedly connected to the mounting plate 41, a linear guide groove 45 is fixedly provided on the bottom of the mounting plate 41, a guide rod 46 is fixedly provided on the side of the first slider 43 close to the linear guide groove 45, and the guide rod 46 slides in the corresponding linear guide groove 45.

[0051] It should be noted that: by using the linear guide groove 45 in conjunction with the guide rod 46 to limit the tension wheel 44 , the stability of the tension wheel 44 can be effectively improved, thereby ensuring the stability of the annular roller belt 313 .

[0052] Refer to the instruction manual Figure 1 , Figure 3 and Fig. 9 In this embodiment, a limiting groove 47 is symmetrically provided in the upper part of the bracket 14, and a limiting rod 48 is horizontally arranged in the limiting groove 47. A second slider 49 and a spring 410 are slidably arranged on the limiting rod 48. The two springs 410 on the same bracket 14 are respectively located on the opposite sides of the corresponding two second sliders 49, and the two ends of the two driven shafts 315 located above are respectively fixedly connected to the corresponding second sliders 49.

[0053] It should be noted that the limiting rod 48, the second slider 49 and the spring 410 are provided in conjunction with the driven shaft 315, so that the surface tension of the annular roller belt 313 can be ensured to be within a suitable range, thereby preventing the annular roller belt 313 from being damaged due to excessive force.

[0054] Refer to the instruction manual Figure 1 and Figure 6 In this embodiment, a gap is reserved between the side of the isolation cover 51 close to the corresponding annular rolling belt 313 and the corresponding micro-shaped cover 314. The distance of the reserved gap is artificially determined to prevent the isolation cover 51 from damaging the surface texture of the micro-shaped cover 314.

[0055] It should be noted that the reserved gap is 10-20 mm. When the upper surface of the annular roller-pressed belt 313 located above is recessed downward, the minimum distance of the reserved gap will become smaller, thereby increasing the difficulty of copper chips flying out, further improving the cleaning effect; at the same time, since the lower surfaces of the left and right sides of the isolation cover 51 located above will not contact the micro-shaped cover 314, additional sealing strip brushes can be provided to adapt to the increased gap between the upper surface of the annular roller-pressed belt 313 and the left and right sides of the isolation cover 51 when it is recessed downward, thereby improving the isolation effect of the isolation cover 51.

[0056] Refer to the instruction manual Fig.11 The present invention also provides a method for preparing a copper-lithium composite foil, comprising the following steps:

[0057] Step 1: Micro-molding the copper foil 2 through a rolling assembly 3 so that protrusions and pits are evenly distributed on the surface of the copper foil 2;

[0058] Step 2: The copper foil 2 after micro-molding is plated with lithium on its surface by a vacuum evaporation machine, thereby obtaining a copper-lithium composite foil;

[0059] Step 3: Take a sample from the copper-lithium composite foil and use a tensile testing machine to test the peeling force between the lithium tape and the copper foil on the sample.

[0060] Further:

[0061] Evaporation process

[0062] The evaporation process conditions are: number of crucibles: 6; evaporation rate: 1.6 g / min; winding speed: 2.5-10 m / min; lithium layer thickness: 1 μm-4 μm, after coating the A side, the B side is coated.

[0063] Micro-shaped copper foil parameters

[0064] Width of micro-shaped copper foil: 300mm

[0065] The surface morphology of micro-shaped copper foil is shown in Fig.12 , there are bumps and pits evenly distributed on the surface of the copper foil.

[0066] The sizes of the concave and convex points are shown in Fig.13 .

[0067] Description of index number:

[0068] 1. AA is the section line of the concave point or convex point; 2. B is the detailed drawing of the concave point or convex point; 3. C is the lateral distance of the convex point or concave point; 4. D is the longitudinal distance of the convex point or concave point; E is the longitudinal distance of the concave point or convex point; F is the lateral distance of the concave point or convex point; G is the depth of the pit or the height of the convex platform; H is the outer diameter of the pit or the convex platform;

[0069] Performance Testing

[0070] Use a sampler to cut an electrode with a length*width of 100*25mm, and use transparent tape to smoothly stick it on the lithium metal of the electrode. Use a pressure of 8N / m2 to compress the transparent tape and the lithium metal layer on the foil. The fixed end of the tensile machine clamps the copper-lithium composite foil to be tested, and the moving end clamps one end of the transparent tape. Stretch at room temperature with a stretching rate of 5mm / min, and record the maximum tension.

[0071] Table 1 Example Scheme Table

[0072]

[0073]

[0074] Embodiment 1:

[0075] Place the micro-shaped copper foil on the unwinding reel and pull the micro-shaped copper foil to the rewinding reel. The evaporation process conditions are as follows: number of crucibles: 6; evaporation rate: 1.6g / min; winding speed: 2.5m / min; after plating the A side, plate the B side. Micro-shaped copper foil parameters: pit depth 8μm, convex platform spacing 120μm.

[0076] Embodiment 2:

[0077] Place the micro-shaped copper foil on the unwinding reel and pull the micro-shaped copper foil to the rewinding reel. The evaporation process conditions are as follows: number of crucibles: 6; evaporation rate: 1.6g / min; winding speed: 5m / min; after plating the A side, plate the B side. Micro-shaped copper foil parameters: pit depth 8μm, convex platform spacing 120μm.

[0078] Embodiment three:

[0079] Place the micro-shaped copper foil on the unwinding reel and pull it onto the reel. The evaporation process conditions are as follows: number of crucibles: 6; evaporation rate: 1.6 g / min; winding speed: 7.5 m / min; after coating the A side, coat the B side. Micro-shaped copper foil parameters: pit depth 8 μm, convex platform spacing 120 μm.

[0080] Embodiment 4:

[0081] Place the micro-shaped copper foil on the unwinding reel and pull it onto the reel. The evaporation process conditions are as follows: number of crucibles: 6; evaporation rate: 1.6 g / min; winding speed: 10 m / min; after coating the A side, coat the B side. Micro-shaped copper foil parameters: pit depth 8 μm, convex platform spacing 120 μm.

[0082] Embodiment five:

[0083] Place the micro-shaped copper foil on the unwinding reel and pull it onto the reel. The evaporation process conditions are as follows: number of crucibles: 6; evaporation rate: 1.6 g / min; winding speed: 7.5 m / min; after coating the A side, coat the B side. Micro-shaped copper foil parameters: pit depth 4 μm, convex platform spacing 120 μm.

[0084] Embodiment six:

[0085] Place the micro-shaped copper foil on the unwinding reel and pull it onto the reel. The evaporation process conditions are as follows: number of crucibles: 6; evaporation rate: 1.6 g / min; winding speed: 7.5 m / min; after coating the A side, coat the B side. Micro-shaped copper foil parameters: pit depth 6 μm, convex platform spacing 120 μm.

[0086] Embodiment seven:

[0087] Place the micro-shaped copper foil on the unwinding reel and pull it onto the reel. The evaporation process conditions are as follows: number of crucibles: 6; evaporation rate: 1.6 g / min; winding speed: 7.5 m / min; after coating the A side, coat the B side. Micro-shaped copper foil parameters: pit depth 8 μm, convex platform spacing 120 μm.

[0088] Embodiment eight:

[0089] Place the micro-shaped copper foil on the unwinding reel and pull it onto the reel. The evaporation process conditions are as follows: number of crucibles: 6; evaporation rate: 1.6 g / min; winding speed: 7.5 m / min; after coating the A side, coat the B side. Micro-shaped copper foil parameters: pit depth 10 μm, convex platform spacing 120 μm.

[0090] Embodiment nine:

[0091] Place the micro-shaped copper foil on the unwinding reel and pull it onto the reel. The evaporation process conditions are as follows: number of crucibles: 6; evaporation rate: 1.6 g / min; winding speed: 7.5 m / min; after coating the A side, coat the B side. Micro-shaped copper foil parameters: pit depth 8 μm, convex platform spacing 80 μm.

[0092] Embodiment ten:

[0093] Place the micro-shaped copper foil on the unwinding reel and pull the micro-shaped copper foil to the reel. The evaporation process conditions are as follows: number of crucibles: 6; evaporation rate: 1.6g / min; winding speed: 7.5m / min; after plating the A side, plate the B side. Micro-shaped copper foil parameters: pit depth 8μm, convex platform spacing 100μm.

[0094] Embodiment eleven:

[0095] Place the micro-shaped copper foil on the unwinding reel and pull it onto the reel. The evaporation process conditions are as follows: number of crucibles: 6; evaporation rate: 1.6 g / min; winding speed: 7.5 m / min; after coating the A side, coat the B side. Micro-shaped copper foil parameters: pit depth 8 μm, convex platform spacing 120 μm.

[0096] Embodiment 12:

[0097] Place the micro-shaped copper foil on the unwinding reel and pull it onto the reel. The evaporation process conditions are as follows: number of crucibles: 6; evaporation rate: 1.6 g / min; winding speed: 7.5 m / min; after coating the A side, coat the B side. Micro-shaped copper foil parameters: pit depth 8 μm, convex platform spacing 140 μm.

[0098] Comparative Example 1:

[0099] Place the conventional copper foil on the unwinding reel and pull it onto the winding reel. The evaporation process conditions are as follows: number of crucibles: 6; evaporation rate: 1.6 g / min; winding speed: 7.5 m / min; after coating the A side, coat the B side.

[0100] 4.2.5 Experimental results

[0101] Table 2 Experimental results

[0102]

[0103]

[0104] From Table 2 we can see that:

[0105] 1. Examples 1 to 12 use micro-shaped copper foils, and the lithium layer peeling force is better than that of comparative example 1 using conventional copper foil;

[0106] 2. In Examples 1 to 4, the winding speed was increased from 2.5 m / min to 10 m / min, and the thickness of the metal lithium plating layer was reduced from 4 μm to 1 μm;

[0107] 3. In Examples 5 to 8, the depth of the micro-shaped pits was increased from 4 μm to 10 μm, and the stripping force of the metal lithium plating layer showed an upward trend. However, because there was no foil with a deeper pit depth, no further experiments were performed;

[0108] In Examples 9 to 12, the micro-shaped boss spacing was increased from 80 μm to 140 μm, and the stripping force of the metal lithium plating layer tended to decrease. However, due to the lack of foil with a smaller boss spacing, no further experiments were performed.

[0109] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A copper-lithium composite foil manufacturing device, comprising a support assembly (1), a copper foil (2), a rolling assembly (3), an adjustment assembly (4) and a cleaning assembly (5), wherein the support assembly (1) comprises a base (11), a bracket (14) is arranged above the base (11), and the device is characterized in that: The rolling assembly (3) comprises a shaping assembly (31), wherein the shaping assembly (31) comprises two driving rollers (312) symmetrically arranged in the same vertical plane, the vertical plane passing through the axis of the two driving rollers (312), an annular rolling belt (313) is driven on the outside of the driving roller (312), and a micro-shaped covering (314) is arranged on the outer surface of the annular rolling belt (313), the annular rolling belt (313) is horizontally arranged in the middle position of the bracket (14), and a driven shaft (315) is arranged on the opposite side of the bracket (14), and a driving roller (312) and two driven shafts (315) are arranged on the inner side of a single annular rolling belt (313), so that the cross section of the annular rolling belt (313) is triangular, and a rolling zone is formed between the two annular rolling belts (313). When the copper foil (2) passes through the rolling zone, the two annular rolling belts (313) roll micro-shaped pits and protrusions on the surface of the copper foil (2); The cleaning assembly (5) comprises two isolation covers (51), the two isolation covers (51) are respectively arranged on the side of the corresponding annular roller belt (313) away from the copper foil (2), and the opening of the isolation cover (51) faces the corresponding annular roller belt (313), the isolation cover (51) is fixedly arranged on the opposite side of the bracket (14), and the inner side of the isolation cover (51) is provided with a high-pressure air nozzle (52) and a vacuum exhaust pipe (53) in sequence along the rotation direction of the annular roller belt (313), the high-pressure air nozzle (52) is externally connected to a high-pressure air pump for cleaning out the copper chips compacted in the micro-shaped texture of the annular roller belt (313), and the vacuum exhaust pipe (53) is externally connected to a vacuum dust pump for sucking away the cleaned copper chips.

2. The copper-lithium composite foil manufacturing device according to claim 1, characterized in that: The rolling assembly (3) further comprises two sets of driving assemblies (32) for driving the annular rolling belt (313) to rotate; a fixed platform (12) and a lifting platform (13) are arranged above the base (11); the bracket (14) is located in the middle of the base (11); the lifting platform (13) and the fixed platform (12) are respectively located on the left and right sides of the bracket (14); and the two sets of driving assemblies (32) are respectively located on the top of the lifting platform (13) and the fixed platform (12).

3. The copper-lithium composite foil manufacturing device according to claim 2, characterized in that: The driving assembly (32) comprises a motor (321) and a gear box (322) matched with the motor (321); driving shafts (33) are fixedly provided at both ends of the driving roller (312), and one of the driving shafts (33) is fixedly connected to an output shaft of a corresponding gear box (322).

4. The copper-lithium composite foil manufacturing device according to claim 3, characterized in that: A hydraulic cylinder (15) is fixedly arranged on the top of the bracket (14), and a lifting groove (16) with an opening facing upward is arranged on the top of the bracket (14), a mounting seat (17) is slidably arranged in the lifting groove (16) up and down, two driving shafts (33) located at the top are rotatably connected to the corresponding mounting seats (17), and the output end of the hydraulic cylinder (15) is fixedly connected to the corresponding mounting seat (17).

5. The copper-lithium composite foil manufacturing device according to claim 4, characterized in that: The adjustment component (4) comprises two pushing components (42), and the two pushing components (42) are symmetrically arranged on the left and right sides of the annular roller belt (313) located above. A tensioning wheel (44) is arranged at the output end of the pushing component (42), and the tensioning wheel (44) is in contact with the upper surface of the annular roller belt (313). When the tensioning wheel (44) is pressed downward, the upper surface of the annular roller belt (313) located above is pressed downward.

6. The copper-lithium composite foil manufacturing device according to claim 5, characterized in that: The pushing component (42) is an electric push rod or a hydraulic push rod, and a first slider (43) is fixedly arranged at the output end of the electric push rod. The tensioning wheel (44) is rotatably arranged on a side of the first slider close to the corresponding annular roller belt (313).

7. The copper-lithium composite foil manufacturing device according to claim 6, characterized in that: A mounting plate (41) is fixedly provided on the opposite side of the bracket (14), the electric push rod is fixedly connected to the mounting plate (41), a linear guide groove (45) is fixedly provided on the bottom of the mounting plate (41), a guide rod (46) is fixedly provided on the side of the first sliding block (43) close to the linear guide groove (45), and the guide rod (46) slides in the corresponding linear guide groove (45).

8. The copper-lithium composite foil manufacturing device according to claim 7, characterized in that: The upper portion of the bracket (14) is provided with a limiting groove (47) symmetrically arranged in the front and rear directions, a limiting rod (48) is horizontally arranged in the limiting groove (47), a second slider (49) and a spring (410) are slidably arranged on the limiting rod (48), two springs (410) on the same bracket (14) are respectively located on opposite sides of two corresponding second sliders (49), and two ends of the two driven shafts (315) located at the top are respectively fixedly connected to the corresponding second sliders (49).

9. The copper-lithium composite foil manufacturing device according to claim 8, characterized in that: A gap is reserved between the side of the isolation cover (51) close to the corresponding annular rolling belt (313) and the corresponding micro-shaped cover (314), and the distance of the reserved gap is artificially determined to prevent the isolation cover (51) from damaging the surface texture of the micro-shaped cover (314).

10. A method for producing a copper-lithium composite foil, characterized in that: The following steps are involved: Step 1: Processing the copper foil (2) through a rolling assembly (3) for micro-molding, so that protrusions and pits are evenly distributed on the surface of the copper foil (2); Step 2: Plating lithium on the surface of the micro-shaped copper foil (2) by a vacuum evaporation machine, thereby obtaining a copper-lithium composite foil; Step 3: Take a sample from the copper-lithium composite foil and use a tensile testing machine to test the peeling force between the lithium tape and the copper foil on the sample.

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