Preparation device for ultrathin metal material
Through the combination of the calendering roller and the transfer roller and the design of the nozzle mechanism, the problem of difficulty in preparing ultra-thin metals in the existing devices is solved, and efficient and accurate preparation of ultra-thin metal materials is achieved.
Patent Information
- Application Number
- CN202420929143.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-29
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-04-29
AI Technical Summary
It is difficult to meet the thickness requirements of ultra-thin metals in one-time extrusion of existing devices, and the efficiency of preparing ultra-thin metal materials is low and the steps are cumbersome.
The calendering roller and the transfer roller are arranged oppositely, and combined with the first nozzle mechanism, the metal raw material is extruded to the surface of the calendering roller, and thinned and extended in the first gap by relative rotation to form an ultra-thin metal material.
The one-time extrusion molding of molten metal materials is realized, the preparation steps are simplified, the metal belt is avoided, and the morphology and density of ultra-thin metal materials can be accurately controlled.
Smart Images
Figure CN223043316U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of ultra-thin metal preparation, and particularly to a device for preparing ultra-thin metal materials. Background Art
[0002] Existing ultra-thin metallic lithium is obtained by passing a lithium strip between two rollers and extruding the metallic lithium strip. To obtain ultra-thin metallic lithium (<10 μm) in this preparation method, it is generally achieved through multiple extrusions, as a single extrusion cannot meet the requirement of the ultra-thin thickness. Summary of the Utility Model
[0003] Purpose of the Utility Model: This application provides a device for preparing ultra-thin metal materials, aiming to solve the technical problem that a single extrusion of the existing device cannot meet the requirement of the ultra-thin thickness.
[0004] This application provides a device for preparing ultra-thin metal materials, including:
[0005] A rolling roll and a transfer roll, the rolling roll and the transfer roll are arranged oppositely, and there is a first gap between the rolling roll and the transfer roll;
[0006] A first nozzle mechanism, which is located on one side of the rolling roll and is used to extrude a metal raw material onto the surface of the rolling roll to form a metal layer;
[0007] The rolling roll and the transfer roll rotate relative to each other, so that the metal layer is thinned and extended in the first gap to form an ultra-thin metal material.
[0008] In some embodiments, the first nozzle mechanism includes a housing and a first nozzle head. The housing has a first cavity. The first nozzle head is connected to the housing and communicates with the first cavity. The metal raw material is stored in the first cavity and is extruded onto the surface of the rolling roll through the first nozzle head.
[0009] In some embodiments, the first nozzle mechanism further includes a second nozzle head. The housing further has a second cavity. The first cavity and the second cavity are isolated from each other. The second nozzle head is connected to the housing and communicates with the second cavity. The second nozzle head is used to extrude a first auxiliary rolling material onto the surface of the rolling roll.
[0010] In some embodiments, the first nozzle head includes a nozzle. The nozzle includes a housing and a shielding portion. The housing has a cavity. The shielding portion is arranged in the cavity and has a gap with the inner wall of the housing.
[0011] In some embodiments, the first nozzle includes a plurality of nozzles. The plurality of first nozzles are arranged at intervals in a first direction and communicate with the first cavity. The widths of the plurality of nozzles in the first direction are the same or different, and the distances between adjacent two of the nozzles in the first direction are the same or different.
[0012] In some embodiments, when the widths of the plurality of nozzles in the first direction are the same, the width is W1 mm, and when the distances between adjacent two of the nozzles in the first direction are the same, the distance is W2 mm, satisfying: 0 mm ≤ |W1 - W2| ≤ 100 mm.
[0013] In some embodiments, the apparatus for preparing the ultra-thin metal material further includes:
[0014] A moving mechanism, which is connected to the first nozzle mechanism. The moving mechanism can drive the first nozzle mechanism to move relative to the calender roll so that the metal raw material spreads on the surface of the calender roll.
[0015] The moving speed of the first nozzle mechanism relative to the calender roll is f m / min, the angle between the first nozzle mechanism and the surface of the calender roll is θ°, and the flow rate of the metal raw material extruded by the first nozzle mechanism is c1 mL / min, satisfying: 2.86×10 -5 ≤ (θ × c1) / f ≤ 1.35×10 5 .
[0016] In some embodiments, the moving speed of the first nozzle mechanism relative to the calender roll is f m / min, satisfying: 0.1 m / min ≤ f ≤ 35 m / min.
[0017] In some embodiments, the angle between the first nozzle mechanism and the surface of the calender roll is θ°, satisfying: 0° < θ ≤ 90°.
[0018] In some embodiments, the flow rate of the metal raw material extruded by the first nozzle mechanism is c1 mL / min, satisfying: 0.1 mL / min ≤ c1 ≤ 150 mL / min.
[0019] In some embodiments, the apparatus for preparing the ultra-thin metal material further includes:
[0020] A second nozzle mechanism, which is located on one side of the transfer roll and is used to extrude a second auxiliary calendering material onto the surface of the transfer roll.
[0021] In some embodiments, the apparatus for preparing the ultra-thin metal material further includes:
[0022] A cooling mechanism, which is located on one side of the calender roll and the first nozzle mechanism, and is used to cool the metal raw material extruded from the first nozzle mechanism onto the surface of the calender roll.
[0023] The present application provides a device for preparing an ultra-thin metal material. The device for preparing the ultra-thin metal material includes: a calender roll, a transfer roll, and a first nozzle mechanism. The calender roll and the transfer roll are arranged opposite to each other, and there is a first gap between the calender roll and the transfer roll; the first nozzle mechanism is located on one side of the calender roll and is used to extrude the metal raw material onto the surface of the calender roll to form a metal layer; the calender roll and the transfer roll rotate relative to each other so that the metal layer is thinned and extended in the first gap to form an ultra-thin metal material. The device for preparing the ultra-thin metal material provided by the present application can realize the preparation of the ultra-thin metal material by one-time extrusion molding of the molten metal material. Description of the Drawings
[0024] In order to more clearly illustrate the technical solutions in the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.
[0025] Figure 1 It is the first structural schematic diagram of the device for preparing the ultra-thin metal material provided by the present application;
[0026] Figure 2 It is the second structural schematic diagram of the device for preparing the ultra-thin metal material provided by the present application;
[0027] Figure 3 It is the third structural schematic diagram of the device for preparing the ultra-thin metal material provided by the present application;
[0028] Figure 4 It is the schematic diagram of the angle between the first nozzle mechanism and the surface of the calender roll in the device for preparing the ultra-thin metal material provided by the present application;
[0029] Figure 5 It is the side view of the first nozzle mechanism provided by the present application;
[0030] Figure 6 It is the first front view of the first nozzle mechanism provided by the present application;
[0031] Figure 7 For Figure 6 the application scenario diagram of the first nozzle mechanism in
[0032] Figure 8 It is the side view of the nozzle provided by the present application;
[0033] Figure 9For Figure 8 The top view of the provided nozzle;
[0034] Figure 10 The second front view of the first nozzle mechanism provided by the present application;
[0035] Figure 11 The third front view of the first nozzle mechanism provided by the present application;
[0036] Figure 12 The first layout schematic diagram of the ultra-thin metal material provided by the present application;
[0037] Figure 13 The second layout schematic diagram of the ultra-thin metal material provided by the present application;
[0038] Figure 14 The third layout schematic diagram of the ultra-thin metal material provided by the present application;
[0039] Figure 15 The fourth layout schematic diagram of the ultra-thin metal material provided by the present application.
[0040] In the drawings, the components represented by each reference numeral are as follows:
[0041] 1. Calendering roll; 2. Transfer roll; 3. First nozzle mechanism; 31. Housing; 311. First cavity; 312. Second cavity; 313. Partition; 32. First spray head; 321. Nozzle; 3211. Outer shell; 3212. Shielding part; 3213. Gap; 3214. Connecting rod; 33. Second spray head; 4. Moving mechanism; 5. Second nozzle mechanism; 6. Cooling mechanism; 100. Ultra-thin metal material; 200. Support film. Detailed implementation manners
[0042] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of the present application.
[0043] It should be noted that the serial number terms [First], [Second], [Third], [Fourth], etc. mentioned in the present application do not represent any order, quantity or importance, but are only used to distinguish different parts. The direction terms [Up], [Down], [Left], [Right], etc. mentioned in the present application are only references to the directions in the attached drawings. Therefore, the serial number terms, direction terms and positional relationship terms used are for explaining and understanding the present application, rather than for limiting the present application. In the drawings, units with similar structures are denoted by the same reference numerals.
[0044] An embodiment of the present application provides a preparation device for an ultra-thin metal material, and the present application will be described in detail below with reference to specific embodiments.
[0045] As Figures 1 to 4 shown, a preparation device for an ultra-thin metal material includes a calender roll 1, a transfer roll 2, and a first nozzle mechanism 3. The calender roll 1 and the transfer roll 2 are arranged opposite to each other, and there is a first gap between the calender roll 1 and the transfer roll 2; the first nozzle mechanism 3 is located on one side of the calender roll 1 and is used to extrude a metal raw material onto the surface of the calender roll 1 to form a metal layer; the calender roll 1 and the transfer roll 2 rotate relative to each other so that the metal layer is thinned and extended in the first gap to form an ultra-thin metal material 100.
[0046] It can be understood that the preparation device for the ultra-thin metal material provided by the present application can realize the preparation of the ultra-thin metal material 100 by extruding the molten metal material onto the surface of the calender roll 1 through the first nozzle mechanism 3 and then performing one-time extrusion molding by the calender roll 1 and the transfer roll 2. It can also realize the printing of a slurry containing particulate metal or metal alloy, and at the same time, it can also realize the precise control of the arbitrary morphology arrangement of the ultra-thin metal material 100 and the areal density of the ultra-thin metal material.
[0047] In some embodiments, the calender roll 1 and the transfer roll 2 rotate in opposite directions. Specifically, when the calender roll 1 rotates clockwise, the transfer roll 2 rotates counterclockwise, please refer to Figure 1 ; when the calender roll 1 rotates counterclockwise, the transfer roll 2 rotates clockwise, please refer to Figure 2 and Figure 3 ; the present application does not make specific limitations on the rotation direction and speed of the calender roll 1 and the transfer roll 2.
[0048] In some embodiments, the metal raw material includes molten metal, a slurry containing particulate metal or metal alloy.
[0049] It can be understood that when the metal raw material is molten metal, the ultra-thin metal material 100 can be prepared by one-time extrusion molding of the molten metal. Compared with the multiple rollings of traditional metal strips, the preparation steps are more precise and simple, and at the same time, it can also prevent the metal strip from running off during the traditional calendering process; when the metal raw material is a slurry containing particulate metal or metal alloy, it can be extruded onto the surface of the calender roll 1 through this device, and then the metal particles or metal alloy particles are extruded to a suitable thickness through the extrusion between the calender roll 1 and the transfer roll 2, and then transferred to the surface of the negative electrode through the device to achieve negative electrode lithium supplementation.
[0050] In addition, through this device, a slurry containing lithium metal particles can also be directly coated on the negative electrode surface, and then negative electrode lithium supplementation can be achieved by rolling the negative electrode with metal lithium particles coated on the surface.
[0051] In some embodiments, the molten metal material includes lithium (Li) metal or a lithium alloy; wherein, the lithium alloy material includes lithium metal and a doping metal, and the doping metal is selected from at least one of magnesium (Mg), aluminum (Al), silicon (Si), sodium (Na), potassium (K), and calcium (Ca).
[0052] In some embodiments, based on the total mass of the lithium alloy, the mass percentage of the doping metal is B%, satisfying: 0 < B ≤ 3%. Specifically, based on the total mass of the lithium alloy, the mass percentage of the doping metal can be any value or the range between any two values among 0.1%, 0.5%, 1%, 1.5%, 2%, 2.5%, and 3%.
[0053] It can be understood that adding a doping metal to lithium metal can further reduce the contact angle between the molten metal and the surface of the calender roll 1, thereby facilitating the spreading of the molten metal on the surface of the calender roll 1.
[0054] In some embodiments, the extrusion pressure between the calender roll 1 and the transfer roll 2 is Tt, satisfying: 0 < T ≤ 10t. Specifically, the extrusion pressure between the calender roll 1 and the transfer roll 2 can be any value or the range between any two values among 0.1t, 1t, 2t, 3t, 4t, 5t, 6t, 7t, 8t, 9t, and 10t.
[0055] In some embodiments, the width of the first gap is D μm, satisfying: 0 μm ≤ D < 10 μm. Specifically, the width of the first gap can be any value or the range between any two values among 0 μm, 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, and 9.5 μm.
[0056] It can be understood that when the calender roll 1 and the transfer roll 2 are idling or in an idle condition, the calender roll 1 and the transfer roll 2 are in contact with each other, and the width of the first gap is 0. When the calender roll 1 and the transfer roll 2 extrude and thin the metal layer, the width of the first gap is the same as the thickness of the ultra-thin metal material 100 obtained.
[0057] As Figure 5 shown, in some embodiments, the first nozzle mechanism 3 includes a housing 31 and a first nozzle head 32. The housing 31 has a first cavity 311. The first nozzle head 32 is connected to the housing 31 and communicates with the first cavity 311. The metal raw material is stored in the first cavity 311 and is extruded onto the surface of the calender roll 1 through the first nozzle head 32.
[0058] It can be understood that the metal raw material is stored in the first cavity 311 of the first nozzle mechanism 3 and is extruded onto the surface of the calender roll 1 through the first nozzle head 32.
[0059] In some embodiments, the first nozzle mechanism 3 further includes a second nozzle head 33. The housing 31 further has a second cavity 312. The first cavity 311 and the second cavity 312 are isolated from each other. The second nozzle head 33 is connected to the housing 31 and communicates with the second cavity 312. The second nozzle head 33 is configured to extrude the first auxiliary rolling material onto the surface of the rolling roller 1.
[0060] It can be understood that the first auxiliary rolling material is stored in the second cavity 312 of the first nozzle mechanism 3 and is extruded onto the surface of the rolling roller 1 through the second nozzle head 33. After the molten metal contacts the surface of the rolling roller 1, the contact angle is relatively large, and it is not easy to spread on the surface of the rolling roller 1, which is not conducive to subsequent rolling forming and transfer. Before the first nozzle mechanism 3 extrudes the molten metal, the first auxiliary rolling material is coated on the surface of the rolling roller 1 first, or the first nozzle mechanism 3 extrudes the molten metal and the first auxiliary rolling material simultaneously, and controls the first auxiliary rolling material to contact and coat the surface of the rolling roller 1 before the molten metal, which can reduce the contact angle between the molten metal and the surface of the rolling roller 1, is conducive to the molten metal spreading well on the surface of the rolling roller 1, helps the auxiliary metal layer to be rolled into the ultra-thin metal material 100, and is also conducive to transferring the metal layer from the surface of the rolling roller 1 to the surface of the transfer roller 2.
[0061] In some embodiments, the flow rate of the first auxiliary rolling material extruded by the second nozzle head 33 is c2 mL / min, satisfying: 0.1 mL / min ≤ c2 ≤ 150 mL / min. Specifically, the flow rate of the first auxiliary rolling material extruded by the second nozzle head 33 can be any value or the range between any two values among 0.1 mL / min, 1 mL / min, 10 mL / min, 20 mL / min, 30 mL / min, 40 mL / min, 50 mL / min, 60 mL / min, 70 mL / min, 80 mL / min, 90 mL / min, 100 mL / min, 110 mL / min, 120 mL / min, 130 mL / min, 140 mL / min, 150 mL / min.
[0062] In some embodiments, the first auxiliary rolling material includes a first substance and a second substance; the mass ratio of the first substance to the second substance is 0.03 to 0.9:1; wherein, the first substance is selected from at least one of artificial graphite, polytetrafluoroethylene, flake graphite, fluorinated graphite, molybdenum disulfide, boron nitride; the second substance is selected from at least one of lubricating oil, white oil, silicone oil, paraffin oil, machine oil, cutting fluid. Specifically, the mass ratio of the first substance to the second substance can be any value or the range between any two values among 0.03:1, 0.04:1, 0.05:1, 0.06:1, 0.07:1, 0.08:1, 0.09:1, 0.1:1, 0.2:1, 0.3:1, 0.4:1, 0.5:1, 0.6:1, 0.7:1, 0.8:1, 0.9:1.
[0063] In some embodiments, the viscosity of the first auxiliary rolling material is 3000 to 35000 cP, and the viscosity of the first auxiliary rolling material can be any value or the range between any two values among 3000 cP, 5000 cP, 7000 cP, 9000 cP, 11000 cP, 13000 cP, 15000 cP, 17000 cP, 19000 cP, 21000 cP, 23000 cP, 25000 cP, 27000 cP, 29000 cP, 31000 cP, 33000 cP, 35000 cP.
[0064] As Figure 5 shown, in some embodiments, a partition plate 313 is provided between the first cavity 311 and the second cavity 312, and the partition plate 313 is connected to the housing 31 to isolate the first cavity 311 and the second cavity 312 from each other.
[0065] As Figure 6 shown, in some embodiments, the first nozzle 32 includes a nozzle 321, the length of the nozzle 321 along the first direction X is L1 mm, and the length of the first cavity 311 along the first direction X is L2 mm, satisfying: L1 ≤ L2.
[0066] It can be understood that the length L1 of the nozzle 321 and the length L2 of the first cavity 311 satisfy: L1 ≤ L2. When the length of the nozzle 321 is infinitely close to the length of the first cavity 311, the first nozzle mechanism 3 can realize the preparation of the entire surface of the ultra-thin metal material 100 through continuous spraying. For details, see Figure 7 and Figure 12 ; when the length of the nozzle 321 is infinitely smaller than the length of the first cavity 311, the first nozzle mechanism 3 can realize the array arrangement of the ultra-thin metal material 100 by intermittently spraying dot-shaped metal raw materials. For details, see Figure 14 ; the first nozzle mechanism 3 sprays dot-shaped metal raw materials in a zigzag movement manner to obtainFigure 15 The ultra-thin metal material 100 arranged as shown.
[0067] As Figure 8 and Figure 9 shown, in some embodiments, the first nozzle 32 includes a nozzle 321, the nozzle 321 includes a housing 3211 and a shielding portion 3212, the housing 3211 has a cavity 32111, the shielding portion 3212 is disposed in the cavity 32111, and there is a gap 3213 between the shielding portion 3212 and the inner wall of the housing 3211.
[0068] It can be understood that by using the nozzle 321 with the shielding portion 3212 inside, the ultra-thin metal material 100 in the shape of a ring can be printed. When the first nozzle 32 sprays dot-shaped metal raw materials in a discontinuous manner, the ultra-thin metal material 100 in the shape of a ring and arranged in an array can be obtained. For details, please refer to Figure 13 .
[0069] In some embodiments, the shielding portion 3212 can be a solid or hollow and sealed cylinder. The shielding portion 3212 is connected to the housing 3211 through a connecting rod 3214.
[0070] As Figure 10 and Figure 11 shown, in some embodiments, the first nozzle 32 includes a plurality of nozzles 321, the plurality of first nozzles 321 are arranged at intervals along the first direction X, and are communicated with the first cavity 311. The widths of the plurality of nozzles 321 in the first direction X are the same or different, and the distances between adjacent two nozzles 321 in the first direction X are the same or different.
[0071] It can be understood that in the present application, by setting different numbers of nozzles 321, by changing the width of the nozzles 321 and the distance between adjacent two nozzles 321, the ultra-thin metal material 100 with different requirements can be prepared.
[0072] In some embodiments, when the widths of the plurality of nozzles 321 in the first direction X are the same, the width is W1 mm, and when the distances between adjacent two nozzles 321 in the first direction X are the same, the distance is W2 mm, satisfying: 0 mm ≤ |W1 - W2| ≤ 100 mm. Specifically, the value of |W1 - W2| can be any one value or the range between any two values among 0 mm, 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 100 mm.
[0073] It can be understood that when the widths of multiple nozzles 321 in the first direction X are the same, and when the spacing between two adjacent nozzles 321 in the first direction X is the same, by controlling 0mm ≤ |W1 - W2| ≤ 100mm, the preparation of the neatly arranged ultra-thin metal material 100 can be achieved. For details, please refer to Figure 13 and 14 .
[0074] Please refer to again Figure 3 and Figure 4 , in some embodiments, the preparation device of the ultra-thin metal material further includes: a moving mechanism 4, the moving mechanism 4 is connected to the first nozzle mechanism 3, and the moving mechanism 4 can drive the first nozzle mechanism 3 to move relative to the calender roll 1 so that the metal raw material spreads on the surface of the calender roll 1; the moving speed of the first nozzle mechanism 3 relative to the calender roll 1 is f m / min, the included angle between the first nozzle mechanism 3 and the surface of the calender roll 1 is θ°, and the flow rate of the metal raw material extruded by the first nozzle mechanism 3 is c1 mL / min, satisfying: 2.86×10 -5 ≤ (θ × c1) / f ≤ 1.35×10 5 . Specifically, the value of (θ × c1) / f can be 2.86×10 -5 , 2.7×10 -4 , 2.5×10 -3 , 2×10 -2 , 1×10 -1 , 1, 2×10 1 , 2×10 2 , 3×10 3 , 4×10 4 , 1.35×10 5 or any range between any two values. Specifically, please refer to Figure 4 , the included angle between the center line S of the first nozzle mechanism 3 and the tangent V of the roll surface of the calender roll 1 is θ°.
[0075] It can be understood that when the moving speed of the first nozzle mechanism 3 relative to the calender roll 1 is f m / min, the included angle between the first nozzle mechanism 3 and the surface of the calender roll 1 is θ°, and the flow rate of the metal raw material extruded by the first nozzle mechanism 3 is c1 mL / min, satisfying: 2.86×10 -5 ≤ (θ × c1) / f ≤ 1.35×10 5 , it is beneficial to prepare the ultra-thin metal material 100.
[0076] In some embodiments, the moving mechanism 4 can be a pneumatic cylinder or a hydraulic cylinder.
[0077] In some embodiments, the moving speed of the first nozzle mechanism 3 relative to the calender roll 1 is f, satisfying: 0.1 m / min ≤ f ≤ 35 m / min. Specifically, the moving speed of the first nozzle mechanism 3 relative to the calender roll 1 can be any value among 0.1 m / min, 5 m / min, 10 m / min, 15 m / min, 20 m / min, 25 m / min, 30 m / min, 35 m / min or the range between any two values.
[0078] It can be understood that by controlling the moving speed of the first nozzle mechanism 3 relative to the calender roll 1 to be f, satisfying: 0.1 m / min ≤ f ≤ 35 m / min, the present application is conducive to controlling the morphology of the molten metal, and thus the morphology of the ultra-thin metal material 100 obtained by control.
[0079] In some embodiments, the included angle between the first nozzle mechanism 3 and the surface of the calender roll 1 is θ°, satisfying: 0° < θ ≤ 90°. Specifically, the included angle between the first nozzle mechanism 3 and the surface of the calender roll 1 can be any value among 1°, 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80°, 90° or the range between any two values.
[0080] It can be understood that by controlling the included angle between the first nozzle mechanism 3 and the surface of the calender roll 1 to be θ°, satisfying: 0° < θ ≤ 90°, it is beneficial for the first nozzle mechanism 3 to extrude the molten metal onto the surface of the calender roll 1 to form a metal layer.
[0081] In some embodiments, the flow rate of the metal raw material extruded by the first nozzle mechanism 3 is c1 mL / min, satisfying: 0.1 mL / min ≤ c1 ≤ 150 mL / min. Specifically, the flow rate of the metal raw material extruded by the first nozzle mechanism 3 can be any value among 0.1 mL / min, 1 mL / min, 10 mL / min, 20 mL / min, 30 mL / min, 40 mL / min, 50 mL / min, 60 mL / min, 70 mL / min, 80 mL / min, 90 mL / min, 100 mL / min, 110 mL / min, 120 mL / min, 130 mL / min, 140 mL / min, 150 mL / min or the range between any two values.
[0082] It can be understood that by controlling the flow rate of the metal raw material extruded by the first nozzle mechanism 3 to be c1 mL / min, satisfying: 0.1 mL / min ≤ c1 ≤ 150 mL / min, it is convenient to control the extrusion amount of the metal raw material and the thickness and morphology of the metal layer formed on the surface of the calender roll 1.
[0083] In some embodiments, the apparatus for preparing the ultra-thin metal material further includes: a second nozzle mechanism 5, which is located on one side of the transfer roller 2 and is configured to extrude a second auxiliary rolling material onto the surface of the transfer roller 2.
[0084] It can be understood that by extruding the second auxiliary rolling material onto the surface of the transfer roller 2 through the second nozzle mechanism 5, the second auxiliary rolling material helps the ultra-thin metal material 100 to be detached from the transfer roller 2 in subsequent processes.
[0085] In some embodiments, the second auxiliary rolling material includes a first substance and a second substance; the mass ratio of the first substance to the second substance is 0.03 to 0.9:1; wherein, the first substance is selected from at least one of artificial graphite, polytetrafluoroethylene, flake graphite, fluorinated graphite, molybdenum disulfide, and boron nitride; the second substance is selected from at least one of lubricating oil, white oil, silicone oil, paraffin oil, machine oil, and cutting fluid. Specifically, the mass ratio of the first substance to the second substance can be any value or the range between any two values among 0.03:1, 0.04:1, 0.05:1, 0.06:1, 0.07:1, 0.08:1, 0.09:1, 0.1:1, 0.2:1, 0.3:1, 0.4:1, 0.5:1, 0.6:1, 0.7:1, 0.8:1, 0.9:1.
[0086] In some embodiments, the viscosity of the second auxiliary rolling material is 150,000 to 200,000 cP. Specifically, the viscosity of the second auxiliary rolling material can be any value or the range between any two values among 150,000 cP, 160,000 cP, 170,000 cP, 180,000 cP, 190,000 cP, and 200,000 cP.
[0087] In some embodiments, the composition of the second auxiliary rolling material and the composition of the first auxiliary rolling material can be the same or different.
[0088] In some embodiments, the viscosity of the second auxiliary rolling material and the viscosity of the first auxiliary rolling material can be the same or different.
[0089] It can be understood that by controlling the mass ratio of the first substance to the second substance to be 0.03 - 0.9:1 in this application, it is convenient to adjust the viscosities and rheological properties of the first auxiliary rolling material and the second auxiliary rolling material, enabling the first auxiliary rolling material to facilitate the better spreading of the molten metal on the surface of the rolling roll 1, reducing the contact angle between the molten metal and the surface of the rolling roll 1, and assisting in thinning and extending the metal layer into the ultra-thin metal material 100; enabling the second auxiliary rolling material to facilitate the detachment of the ultra-thin metal material 100 from the transfer roll 2. It should be noted that both the first substance and the second substance can provide a certain lubricity, facilitating the spreading or detachment of the metal material; on the other hand, when the prepared ultra-thin metal material 100 is used for lithium supplementation of the negative electrode sheet, a small amount of the first substance and the second substance will also enter the battery cell along with the ultra-thin metal material 100, and neither the first substance nor the second substance will affect the battery performance.
[0090] Please refer to again Figure 3 , in some embodiments, the apparatus for preparing the ultra-thin metal material further includes: a cooling mechanism 6, the cooling mechanism 6 is located on one side of the rolling roll 1 and the first nozzle mechanism 3, and the cooling mechanism 6 is used to cool the metal raw material extruded from the first nozzle mechanism 3 onto the surface of the rolling roll 1.
[0091] It can be understood that by providing the cooling mechanism in this application, the molten metal extruded from the first nozzle mechanism 3 onto the surface of the rolling roll 1 can be cooled, thereby improving the contact angle between the molten metal and the surface of the rolling roll 1 and facilitating the spreading of the molten metal on the surface of the rolling roll.
[0092] In some embodiments, the cooling mechanism can be an industrial fan or dry cold air. Specifically, the temperature of the dry cold air is -10°C.
[0093] In some embodiments, a temperature control component is provided inside the rolling roll 1 for heating or cooling the rolling roll 1.
[0094] It can be understood that in this application, the molten metal extruded from the first nozzle mechanism 3 onto the surface of the rolling roll 1 can be cooled only by the cooling mechanism; the molten metal extruded from the first nozzle mechanism 3 onto the surface of the rolling roll 1 can also be cooled only by the temperature control component of the rolling roll 1 itself; the molten metal extruded onto the surface of the rolling roll 1 can also be cooled simultaneously by the temperature control component of the rolling roll 1 itself and the cooling mechanism.
[0095] Working process of the preparation device for ultra-thin metal materials: First, the second nozzle 33 extrudes the first auxiliary rolling material, and the first auxiliary rolling material is coated on the surface of the rolling roll 1. By adjusting the moving speed of the first nozzle mechanism 3 relative to the rolling roll 1, the flow rate of the extruded molten metal, and the angle between the first nozzle mechanism 3 and the surface of the rolling roll 1, the molten metal with any required morphology can be precisely controlled to form on the surface of the rolling roll 1. After the molten metal cools down, a metal layer is formed, and good contact between the metal layer and the rolling roll 1 can be achieved. The second nozzle mechanism 5 extrudes the second auxiliary rolling material onto the surface of the transfer roll 2, and the cooled metal layer on the surface of the rolling roll 1 is extruded between the transfer roll 2 coated with the second auxiliary rolling material and the rolling roll 1, so that the metal layer can be thinned and transferred to the surface of the transfer roll 2 to obtain ultra-thin metallic lithium material.
[0096] As Figures 12 to 15 shown, in some embodiments, the ultra-thin metal material 100 is adhered to the support film layer 200. Specifically, the support film layer 200 includes a release film or a negative electrode sheet.
[0097] The following will illustrate the present application with specific examples.
[0098] Example 1
[0099] Provide metal raw materials: The lithium alloy is melted at 186 °C. The lithium alloy includes 99.7% by mass of Li and 0.3% by mass of Al.
[0100] Provide the first auxiliary rolling material: The first auxiliary rolling material includes 55% by mass of natural flake graphite and 55% by mass of white oil; the viscosity is 20750 cP.
[0101] Provide the second auxiliary rolling material: The first auxiliary rolling material includes 55% by mass of molybdenum disulfide and 55% by mass of silicone oil; the viscosity is 173570 cP.
[0102] Make the first nozzle mechanism 3 move relative to the rolling roll 1 at a moving speed of 5.5 m / min, control the angle between the first nozzle mechanism 3 and the surface of the rolling roll 1 to be 70°, control the flow rate of the molten lithium alloy extruded by the first nozzle 32 in the first nozzle mechanism 3 to be 12.0 mL / min, and control the flow rate of the first auxiliary rolling material extruded by the second nozzle 33 in the first nozzle mechanism 3 to be 10.0 mL / min. After cooling by the cooling mechanism, a metal lithium alloy layer with a thickness of 43.5 μm is formed on the surface of the rolling roll 1.
[0103] Make the second nozzle mechanism 5 extrude the second auxiliary rolling material onto the surface of the transfer roll 2, and adjust the pressure between the rolling roll 1 and the transfer roll 2 to be 3.5 t. After the metal lithium alloy layer is extruded between the rolling roll 1 and the transfer roll 2, an ultra-thin metal lithium alloy with a thickness of 3.5 μm can be obtained.
[0104] Example 2
[0105] Provide metal raw materials: The lithium alloy is melted at 195 °C. The lithium alloy includes 99.0% by mass of Li, 1.6% by mass of Mg, and 0.4% by mass of Si.
[0106] Provide the first auxiliary rolling material: The first auxiliary rolling material includes 55% by mass of natural flake graphite and 55% by mass of white oil; the viscosity is 20750 cP.
[0107] Provide the second auxiliary rolling material: The first auxiliary rolling material includes 55% by mass of molybdenum disulfide and 55% by mass of silicone oil; the viscosity is 173570 cP.
[0108] Move the first nozzle mechanism 3 relative to the rolling roll 1 at a moving speed of 5.5 m / min, control the angle between the first nozzle mechanism 3 and the surface of the rolling roll 1 to be 70°, control the flow rate of the molten lithium alloy extruded by the first nozzle 32 in the first nozzle mechanism 3 to be 12.0 mL / min, and control the flow rate of the first auxiliary rolling material extruded by the second nozzle 33 in the first nozzle mechanism 3 to be 10.0 mL / min. After cooling by the cooling mechanism, a metal lithium alloy layer with a thickness of 43.5 μm is formed on the surface of the rolling roll 1.
[0109] Extrude the second auxiliary rolling material from the second nozzle mechanism 5 onto the surface of the transfer roll 2, and adjust the pressure between the rolling roll 1 and the transfer roll 2 to be 3.5 t. After extrusion between the rolling roll 1 and the transfer roll 2, an ultra-thin metal lithium alloy with a thickness of 3.5 μm can be obtained.
[0110] Example 3
[0111] Provide metal raw materials: Metallic lithium is melted at 181 °C. The metallic lithium includes 100% by mass of Li.
[0112] Provide the first auxiliary rolling material: The first auxiliary rolling material includes 55% by mass of natural flake graphite and 55% by mass of white oil; the viscosity is 20750 cP.
[0113] Provide the second auxiliary rolling material: The first auxiliary rolling material includes 55% by mass of molybdenum disulfide and 55% by mass of silicone oil; the viscosity is 173570 cP.
[0114] Move the first nozzle mechanism 3 relative to the calender roll 1 at a moving speed of 6 m / min, control the angle between the first nozzle mechanism 3 and the surface of the calender roll 1 to be 45°, control the flow rate of the molten lithium metal extruded by the first nozzle 32 in the first nozzle mechanism 3 to be 10.5 mL / min, and control the flow rate of the first auxiliary rolling material extruded by the second nozzle 33 in the first nozzle mechanism 3 to be 9.0 mL / min. After cooling by the cooling mechanism, a lithium metal alloy layer with a thickness of 77 μm is formed on the surface of the calender roll 1.
[0115] Extrude the second auxiliary rolling material from the second nozzle mechanism 5 onto the surface of the transfer roll 2, and adjust the pressure between the calender roll 1 and the transfer roll 2 to be 3.9 t. After the lithium metal alloy layer is extruded between the calender roll 1 and the transfer roll 2, ultra-thin lithium metal with a thickness of 5.4 μm can be obtained.
[0116] In summary, although the detailed description of the embodiments of the present application is as above, the above embodiments are not intended to limit the present application. Those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.
Claims
1. A device for preparing ultra-thin metal materials, characterized in that: include: A calendering roller and a transfer roller, wherein the calendering roller and the transfer roller are arranged opposite to each other, and a first gap is formed between the calendering roller and the transfer roller, and the width of the first gap is D, which satisfies: 0 μm≤D<10 μm; A first nozzle mechanism, the first nozzle mechanism is located on one side of the calendering roller and is used to extrude the metal raw material onto the surface of the calendering roller to form a metal layer; The calendering roller and the transfer roller rotate relatively to each other so that the metal layer is thinned and stretched in the first gap to form an ultra-thin metal material.
2. The device for preparing ultra-thin metal material according to claim 1, characterized in that: The first nozzle mechanism includes a shell and a first nozzle, the shell has a first cavity, the first nozzle is connected to the shell and communicated with the first cavity, the metal raw material is stored in the first cavity, and is extruded to the surface of the calendering roller through the first nozzle.
3. The device for preparing ultra-thin metal material according to claim 2, characterized in that: The first nozzle mechanism also includes a second nozzle, and the shell also has a second cavity. The first cavity and the second cavity are isolated from each other. The second nozzle is connected to the shell and communicated with the second cavity. The second nozzle is used to extrude the first auxiliary calendering material onto the surface of the calendering roller.
4. The device for preparing ultra-thin metal material according to claim 2, characterized in that: The first nozzle comprises a nozzle, and the nozzle comprises a shell and a shielding part. The shell has a cavity. The shielding part is arranged in the cavity and has a gap with the inner wall of the shell.
5. The device for preparing ultra-thin metal material according to claim 2, characterized in that: The first nozzle includes a plurality of nozzles, which are spaced apart along a first direction and connected to the first cavity. The widths of the plurality of nozzles in the first direction are the same or different, and the spacing between two adjacent nozzles in the first direction is the same or different.
6. The device for preparing ultra-thin metal material according to claim 5, characterized in that: When the widths of the plurality of nozzles in the first direction are the same, the width is W1 mm, and when the interval between two adjacent nozzles in the first direction is the same, the interval is W2 mm, satisfying: 0 mm ≤ | W1 - W2 | ≤ 100 mm.
7. The device for preparing ultra-thin metal material according to claim 1, characterized in that: Also includes: A moving mechanism, the moving mechanism is connected to the first nozzle mechanism, and the moving mechanism can drive the first nozzle mechanism to move relative to the calendering roller, so that the metal raw material spreads on the surface of the calendering roller; The moving speed of the first nozzle mechanism relative to the calendering roller is fm / min, the angle between the first nozzle mechanism and the surface of the calendering roller is θ°, and the flow rate of the metal raw material extruded by the first nozzle mechanism is c1 mL / min, which satisfies: 2.86×10 -5 ≤(θ×c1) / f≤1.35×10 5 .
8. The device for preparing ultra-thin metal material according to claim 7, characterized in that: The moving speed of the first nozzle mechanism relative to the calendering roller is fm / min, which satisfies: 0.1m / min≤f≤35m / min; and / or, The angle between the first nozzle mechanism and the surface of the calendering roller is θ°, which satisfies: 0°<θ≤90°; and / or, The flow rate of the metal raw material extruded by the first nozzle mechanism is c1 mL / min, which satisfies: 0.1 mL / min≤c1≤150 mL / min.
9. The device for preparing ultra-thin metal material according to claim 1, characterized in that: Also includes: A second nozzle mechanism is located at one side of the transfer roller and is used for extruding a second auxiliary calendering material onto the surface of the transfer roller.
10. The device for preparing ultra-thin metal material according to claim 1, characterized in that: Also includes: A cooling mechanism is located on one side of the calendering roller and the first nozzle mechanism, and is used to cool the metal raw material extruded by the first nozzle mechanism onto the surface of the calendering roller.