Lithium strip preparation equipment and preparation method thereof

Abstract

The invention provides lithium strip preparation equipment and a preparation method thereof, relates to the technical field of battery material processing, and is used for improving the preparation efficiency of a surface alloying lithium strip. The lithium strip preparation equipment comprises a rolling device used for pressing a to-be-processed lithium strip; the heating device comprises a heating box body, an input roller and an output roller, the heating box body is provided with a heating space, the input roller and the output roller are both located in the heating space, the input roller is used for feeding a lithium strip to be processed into the heating space, and the heating box body is used for heating the lithium strip located in the heating space into a lithium alloy strip; the output roller is used for sending the lithium strip to be processed out of the heating space; the stripping device comprises a first stripping roller, a second stripping roller and a third stripping roller, the first stripping roller is used for stripping the first release film, the second stripping roller is used for stripping the first metal belt, and the third stripping roller is used for stripping the second release film; and the winding device is used for winding the lithium alloy strip.

Description

Technical Field

[0001] The present application relates to the technical field of battery material processing, and in particular to a lithium strip preparation device and a preparation method thereof. Background Art

[0002] With the development of lithium batteries, the requirements for the energy density of battery cells are getting higher and higher. Pure graphite negative electrodes are difficult to meet the needs of high-energy-density battery cells. In the application of silicon-doped negative electrodes, the energy density improvement is small when the amount of silicon added is small. If the amount of silicon added is further increased, the cycle life will drop sharply. Therefore, the industry has refocused its attention on metallic lithium negative electrodes.

[0003] However, in the related technology, when metallic lithium is used directly as the lithium battery electrode material, due to its material properties, volume expansion is prone to occur during charging and discharging, and problems such as continuous generation of lithium dendrites and electrode pulverization lead to short cycle life and poor safety, which is not conducive to further expansion of industrialization and limits its application scenarios. Summary of the invention

[0004] In order to solve the above technical problems, the present application provides a lithium strip preparation device and a preparation method thereof, which are used to improve the preparation efficiency of surface alloyed lithium strips.

[0005] To achieve the above object, the embodiments of the present invention adopt the following technical solutions:

[0006] In a first aspect, an embodiment of the present application provides a lithium strip preparation device, wherein the processed lithium strip comprises a first release film, a first metal strip, a lithium strip, and a second release film which are sequentially stacked, and the lithium strip preparation device comprises: a rolling device, wherein the rolling device is used to press the lithium strip to be processed; a heating device, wherein the heating device comprises a heating box, an input roller, and an output roller, wherein the heating box has a heating space, wherein the input roller and the output roller are both located in the heating space, wherein the input roller is used to feed the lithium strip to be processed into the heating space, wherein the heating box is used to heat the lithium strip in the heating space into a lithium alloy strip, and wherein the output roller is used to feed the lithium strip to be processed out of the heating space; a stripping device, wherein the stripping device comprises a first stripping roller, a second stripping roller, and a third stripping roller, wherein the first stripping roller is used to strip the first release film, the second stripping roller is used to strip the first metal strip, and the third stripping roller is used to strip the second release film; and a winding device, wherein the winding device is used to wind up the lithium alloy strip.

[0007] The lithium strip preparation equipment of the embodiment of the present application is provided with a rolling device for pressing the lithium strip to be processed, and the lithium strip to be processed located in the heating space is heated by a heating box, so that the metal of the lithium strip and the first metal strip can form an ultra-thin alloy layer on the contact surface of the two through an electrochemical reaction, thereby obtaining a lithium alloy strip, which can optimize the surface problems in the process of charging and discharging of metallic lithium. At the same time, the setting of the rolling device, the heating device, the stripping device and the winding device can realize the continuous and controllable preparation of the lithium alloy strip, and the stripping device can recycle the first release film, the first metal strip and the second release film, which is conducive to reducing the manufacturing cost. In addition, the lithium strip preparation equipment has a simple structure, so that rapid debugging can be achieved.

[0008] In some embodiments, the rolling device includes a first hot roller and a second hot roller, the first hot roller and the second hot roller are located on opposite sides of the lithium strip to be processed, the first heating temperature of the first hot roller and the second hot roller is T1, and the first heating temperature T1 satisfies: 20°C <T1<120℃。

[0009] In some embodiments, there is a distance W between the first heat roller and the second heat roller, and the distance W satisfies: 5 μm≤W≤20 μm.

[0010] In some embodiments, the heating box has a second heating temperature T2, and the second heating temperature T2 satisfies: 20°C <T2<120℃。

[0011] In some embodiments, the heating device further includes a buffer belt structure, wherein the buffer belt structure includes a plurality of tension rollers, and the plurality of tension rollers are arranged at intervals in a direction from the input roller to the output roller.

[0012] In some embodiments, the number of the plurality of tension rollers is greater than or equal to 6 and less than or equal to 22.

[0013] In some embodiments, the lithium strip preparation equipment also includes a feeding device, which includes a first feeding roller, a second feeding roller, a third feeding roller and a fourth feeding roller, the first feeding roller is connected to the first stripping roller, and is used to feed the first release film into the rolling device, the second feeding roller is connected to the second stripping roller, and is used to feed the first metal strip into the rolling device, the third feeding roller is used to feed the lithium strip into the rolling device, and the fourth feeding roller is connected to the third stripping roller, and is used to feed the second release film into the rolling device.

[0014] In some embodiments, the lithium strip to be processed also includes a second metal strip, which is located between the lithium strip and the second release film, the feeding device also includes a fifth feeding roller, and the stripping device also includes a fourth stripping roller, the fifth feeding roller is connected to the fourth stripping roller, and is used to feed the second metal strip into the rolling device.

[0015] In some embodiments, the output roller further includes a first positioning roller and a second positioning roller, and the first positioning roller and the second positioning roller are located on opposite sides of the lithium strip to be processed.

[0016] In a second aspect, the present application provides a lithium strip preparation method, which is applied to the above-mentioned lithium strip preparation equipment, and the lithium strip preparation method comprises the following steps: heating a rolling device to a first heating temperature; feeding the lithium strip to be processed into the rolling device, and heating the heating space to a second heating temperature; feeding the lithium strip to be processed into the heating space after being pressed by the rolling device through the input roller, and heating it in the heating space for a preset time; judging whether the lithium strip to be processed is heated to the preset time; if the lithium strip to be processed is heated to the preset time, controlling the output roller to feed the lithium strip to be processed, and peeling off the first release film through the first peeling roller, peeling off the first metal strip through the second peeling roller, peeling off the second release film through the third peeling roller, and winding up the lithium alloy strip through the winding device.

[0017] Among them, the technical effects brought about by any design method in the second aspect can refer to the technical effects brought about by different design methods in the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0020] Figure 1 A schematic diagram of a lithium ribbon preparation device provided in some embodiments of the present application;

[0021] Figure 2 A schematic diagram of a lithium ribbon preparation device provided in some other embodiments of the present application;

[0022] Figure 3 Schematic diagram of lithium ribbon preparation equipment provided for other embodiments of the present application.

[0023] Reference numerals:

[0024] 100. Lithium strip preparation equipment; 200. Lithium strip to be processed; 210. First release film; 220. First metal strip; 230. Lithium strip; 240. Second metal strip; 250. Second release film; 300. Lithium alloy strip;

[0025] 1. Rolling device; 11. First hot roller; 12. Second hot roller;

[0026] 2. Heating device; 21. Heating box; 22. Input roller; 23. Output roller; 231. First positioning roller; 232. Second positioning roller; 24. Buffer belt structure; 241. Tension roller;

[0027] 3. Stripping device; 31. First stripping roller; 32. Second stripping roller; 33. Third stripping roller; 34. Fourth stripping roller;

[0028] 4. Winding device;

[0029] 5. Feeding device; 51. First feeding roller; 52. Second feeding roller; 53. Third feeding roller; 54. Fourth feeding roller; 55. Fifth feeding roller. DETAILED DESCRIPTION

[0030] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the scheme of the present application will be further described below. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0031] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0032] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0033] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. Among them, "fixed connection" means that the two are connected to each other and the relative position relationship after the connection remains unchanged. In addition, the directional terms mentioned in the embodiments of the present application, such as "inside", "outside", etc., are only references to the directions of the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of the present application, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0034] In the description of the embodiments of the present application, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0035] With the development of lithium batteries, the requirements for the energy density of battery cells are getting higher and higher. Pure graphite negative electrodes are difficult to meet the needs of high-energy-density battery cells. In the application of silicon-doped negative electrodes, the energy density improvement is small when the amount of silicon added is small. If the amount of silicon added is further increased, the cycle life will drop sharply. Therefore, the industry has refocused its attention on metallic lithium negative electrodes.

[0036] However, in the related technology, when metallic lithium is used directly as the lithium battery electrode material, due to its material properties, volume expansion is prone to occur during charging and discharging, and problems such as continuous generation of lithium dendrites and electrode pulverization lead to short cycle life and poor safety, which is not conducive to further expansion of industrialization and limits its application scenarios.

[0037] In order to solve the above-mentioned technical problems, the present application provides a lithium belt preparation device.

[0038] See also Figure 1 , Figure 1Schematic diagram of a lithium strip preparation device provided for some embodiments of the present application. The lithium strip preparation device 100 is used to process a lithium strip 200 to be processed. The lithium strip 200 to be processed may include a first release film 210, a first metal strip 220, a lithium strip 230 and a second release film 250 stacked in sequence. Among them, the material of the first metal strip 220 may be indium, tin, aluminum, etc., and the thickness of the first metal strip 220 may be between 15μm and 100μm. The thickness of the lithium strip 230 may be between 20μm and 100μm. The lithium strip preparation device 100 may include a rolling device 1, a heating device 2, a stripping device 3 and a winding device 4.

[0039] The rolling device 1 can be used to compact the lithium strip 200 to be processed. Specifically, the rolling device 1 compacts the lithium strip 200 to be processed so that the stacked first release film 210, the first metal strip 220, the lithium strip 230 and the second release film 250 can be compacted into one.

[0040] The heating device 2 may include a heating box 21, an input roller 22 and an output roller 23. The heating box 21 may have a heating space. The heating box 21 may heat the heating space by means of resistance wire, electromagnetic induction and the like.

[0041] The input roller 22 can be used to feed the lithium strip 200 to be processed into the heating space, and the heating box 21 is used to heat the lithium strip 230 in the heating space into a lithium alloy strip 300. Specifically, the heating space is a semi-enclosed space, and the heating space can be connected to the outside. The roller pressing device 1 and the input roller 22 can be connected through the lithium strip 200 to be processed. The input roller 22 can feed the lithium strip 200 to be processed after being pressed by the roller pressing device 1 into the heating space, so that the lithium strip 200 to be processed is heated in the heating space. Under the catalysis of the heating space, the metals of the lithium strip 230 and the first metal strip 220 can form an ultra-thin alloy layer on the contact surface of the two through an electrochemical reaction, thereby obtaining a lithium alloy strip 300.

[0042] For example, the first metal strip 220 may be indium. Since indium has a low kinetic impedance and a high diffusion coefficient, it can react with lithium to form an alloy quickly, thereby achieving ultra-fast migration of lithium ions at a high current density. The above method can continuously and quickly prepare lithium-indium alloy strips with different alloying degrees, thereby laying a foundation for the batch and reliable application of metal lithium negative electrodes.

[0043] The output roller 23 is used to send the lithium strip 200 to be processed out of the heating space. Specifically, the heating space has an opening connected to the outside, and the output roller 23 can send the processed lithium strip 200 out of the heating space through the opening. By setting the input roller 22 and the output roller 23, the belt path of the lithium strip 200 to be processed can be determined, which is conducive to improving the reliability of the lithium strip preparation device 100 in preparing the lithium strip.

[0044] The peeling device 3 may include a first peeling roller 31, a second peeling roller 32, and a third peeling roller 33. The first peeling roller 31 may be used to peel the first release film 210, the second peeling roller 32 may be used to peel the first metal strip 220, and the third peeling roller 33 may be used to peel the second release film 250. Among them, the release force of the first release film and the second release film 250 may be less than or equal to 20 N·m. Thus, the output roller 23 sends out the lithium strip 200 to be processed. Through the first peeling roller 31, the second peeling roller 32, and the third peeling roller 33, the first release film 210, the first metal strip 220, and the second release film 250 can be recycled, so that the first release film 210, the first metal strip 220, and the second release film 250 can be recycled, which is conducive to reducing the manufacturing cost.

[0045] The winding device 4 is used to wind the lithium alloy strip 300, which is conducive to improving the production efficiency of the lithium strip preparation device 100.

[0046] According to the lithium strip preparation device 100 of the embodiment of the present application, by setting the rolling device 1 to press the lithium strip 200 to be processed and heating the lithium strip 200 located in the heating space through the heating box 21, the metals of the lithium strip 230 and the first metal strip 220 can form an ultra-thin alloy layer on the contact surface of the two through an electrochemical reaction, so that the lithium alloy strip 300 can be obtained, and the surface problems in the charge and discharge process of metallic lithium can be optimized. At the same time, the setting of the rolling device 1, the heating device 2, the peeling device 3, and the winding device 4 can realize the continuous and controllable preparation of the lithium alloy strip 300, and the peeling device 3 can recycle the first release film 210, the first metal strip 220, and the second release film 250, which is conducive to reducing the manufacturing cost. In addition, the structure of the lithium strip preparation device 100 is simple, so that rapid debugging can be realized.

[0047] Please continue to refer to Figure 1 In some embodiments, the rolling device 1 may further include a first hot roller 11 and a second hot roller 12. The first hot roller 11 and the second hot roller 12 are located on opposite sides of the lithium strip 200 to be processed. The first heating temperature of the first hot roller 11 and the second hot roller 12 is T1, and the first heating temperature T1 satisfies: 20°C < T1 < 120°C. By setting the first hot roller 11 and the second hot roller 12 and defining the heating temperature of the first hot roller 11 and the second hot roller 12, different processing requirements can be met, which is conducive to improving the versatility of the lithium strip preparation device 100.

[0048] Among them, the rolling device 1 may further include a third hot roller and a fourth hot roller, and the third hot roller and the fourth hot roller may be located on one side of the second hot roller 12 or the first hot roller 11.

[0049] Exemplarily, the value of the first heating temperature T1 of the first hot roller 11 and the second hot roller 12 can be 21°C, 30°C, 40°C, 50°C, 60°C, 70°C, 80°C, 90°C, 100°C, 110°C, etc.

[0050] Exemplarily, the roller diameters of the first hot roller 11 and the second hot roller 12 can be the same, and the roller diameters of the first hot roller 11 and the second hot roller 12 can be greater than or equal to 150 mm.

[0051] Please continue to refer to Figure 1 , in some embodiments, there is a spacing W between the first hot roller 11 and the second hot roller 12. The spacing W satisfies: 5 μm ≤ W ≤ 20 μm. Wherein, the spacing W between the first hot roller 11 and the second hot roller 12 is less than the total thickness of the lithium strip 200 to be processed. Thereby, the reliability of the pressing of the rolling device 1 can be ensured.

[0052] Exemplarily, the value of the spacing W between the first hot roller 11 and the second hot roller 12 can be 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, 16 μm, 17 μm, 18 μm, etc.

[0053] Please continue to refer to Figure 1 , in some embodiments, the heating box 21 can have a second heating temperature T2. The second heating temperature T2 satisfies: 20°C < T2 < 120°C. By defining the heating temperature of the heating box 21, different processing requirements can be met, which is beneficial to improving the versatility of the lithium strip preparation device 100.

[0054] Exemplarily, the value of the second heating temperature T2 can be 21°C, 30°C, 40°C, 50°C, 60°C, 70°C, 80°C, 90°C, 100°C, 110°C, etc.

[0055] Please refer to Figure 1 and Figure 2 , Figure 2 is a schematic diagram of a lithium strip preparation device provided in some other embodiments of the present application. In some embodiments, the heating device 2 can further include a buffer strip structure 24. The buffer strip structure 24 can include a plurality of tension rollers 241. The plurality of tension rollers 241 can be arranged at intervals in the direction from the input roller 22 to the output roller 23. By arranging the plurality of tension rollers 241, the lithium strip 200 to be processed can move between the plurality of tension rollers 241, so that the heating time of the lithium strip 200 to be processed in the heating space can be extended, thereby the reaction time between lithium and the metal can be extended, the structure is simple, and further it is beneficial to reduce the manufacturing cost of the lithium strip preparation device 100.

[0056] Exemplarily, the connection between the plurality of tension rollers 241 and the heating device 2 may be detachably connected, so that the number of tension rollers 241 can be adjusted according to processing requirements, and maintenance and replacement are also convenient.

[0057] Please continue reading Figure 2 In some embodiments, the number of the plurality of tension rollers 241 is greater than or equal to 6 and less than or equal to 22. Therefore, when the number of the tension rollers 241 is less than 6, the alloying of the surface of the lithium strip 230 will be incomplete. When the number of the tension rollers 241 is greater than 22, it is not convenient to peel off.

[0058] Please continue reading Figure 2 In some embodiments, the lithium ribbon preparation device 100 may further include a feeding device 5. The feeding device 5 may include a first feeding roller 51, a second feeding roller 52, a third feeding roller 53, and a fourth feeding roller 54. The first feeding roller 51 is connected to the first stripping roller 31, and is used to feed the first release film 210 into the rolling device 1. The second feeding roller 52 is connected to the second stripping roller 32, and is used to feed the first metal strip 220 into the rolling device 1. The third feeding roller 53 is used to feed the lithium ribbon 230 into the rolling device 1, and the fourth feeding roller 54 is connected to the third stripping roller 33, and is used to feed the second release film 250 into the rolling device 1. In this way, the first release film 210, the second release film 250, and the first metal strip 220 can be reused, which is beneficial to reducing the manufacturing cost of the lithium ribbon preparation device 100, and the continuous production of the lithium ribbon 230 can also be achieved.

[0059] See also Figure 3 , Figure 3 Schematic diagram of a lithium strip preparation device provided for other embodiments of the present application. The lithium strip 200 to be processed may also include a second metal strip 240. The second metal strip 240 is located between the lithium strip 230 and the second release film 250. The feeding device 5 may also include a fifth feeding roller 55, and the stripping device 3 may also include a fourth stripping roller 34, the fifth feeding roller 55 is connected to the fourth stripping roller 34, and is used to feed the second metal strip 240 into the rolling device 1. In this way, alloying can be achieved on both opposite sides of the lithium strip 230, so as to meet different usage requirements, thereby being beneficial to improving the versatility of the lithium strip preparation device 100, and also beneficial to reducing the manufacturing cost of the lithium strip preparation device 100.

[0060] Please continue reading Figure 3 In some embodiments, the output roller 23 may further include a first positioning roller 231 and a second positioning roller 232. The first positioning roller 231 and the second positioning roller 232 may be located on opposite sides of the lithium ribbon 200 to be processed. Thus, it is convenient for the stripping device 3 to perform the stripping action, and it is also convenient for the winding device 4 to perform the winding action, which is conducive to improving the reliability and stability of the lithium ribbon preparation device 100 in preparing the lithium ribbon.

[0061] The following is a description of the method for preparing the lithium ribbon 230 according to the embodiment of the present application. The method for preparing the lithium ribbon 230 is applied to the above-mentioned lithium ribbon preparation device 100 .

[0062] The method for preparing the lithium belt 230 comprises the following steps:

[0063] S1: heating the roller pressing device 1 to a first heating temperature.

[0064] S2: The lithium strip 200 to be processed is fed into the rolling device 1, and the heating space is heated to a second heating temperature. Specifically, the first release film 210, the first metal strip 220, the lithium strip 230 and the second release film 250 are fed into the rolling device 1 together, and the rolling device 1 covers one side of the micron-sized lithium strip 230 with the first metal strip 220 at a fixed roll gap, a fixed pressure and a first heating temperature, and covers the outermost side with the first release film 210 and the second release film 250.

[0065] S3: The lithium strip 200 to be processed after being pressed by the rolling device 1 is sent into the heating space through the input roller 22, and heated in the heating space for a preset time. Exemplarily, when the first metal strip 220 is indium, the specific degree of lithium-indium surface contact alloying can be controlled in combination with the second heating temperature, the belt speed, etc. For example, the second heating temperature corresponding to LiIn2 is 30-45°C, and the preset time is not less than 8 minutes, the second heating temperature corresponding to LiIn3 is 40-55°C, and the preset time is not less than 10 minutes, and the second heating temperature corresponding to LiIn5 is 60-75°C, and the preset time is not less than 15 minutes.

[0066] S4: Determine whether the lithium ribbon 200 to be processed is heated for a preset time. Specifically, the preset time can be controlled by the tape speed, sensors, etc.

[0067] S5: If the lithium strip 200 to be processed is heated to the preset time, the output roller 23 is controlled to send out the lithium strip 200 to be processed, and the first release film 210 is peeled off by the first peeling roller 31, the first metal strip 220 is peeled off by the second peeling roller 32, and the second release film 250 is peeled off by the third peeling roller 33, and the winding device 4 winds up the lithium alloy strip 300.

[0068] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0069] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A lithium ribbon preparation device, used for processing a lithium ribbon to be processed, wherein the processed lithium ribbon comprises a first release film, a first metal ribbon, a lithium ribbon and a second release film stacked in sequence, characterized in that: The lithium belt preparation equipment comprises: A rolling device, the rolling device is used to press the lithium strip to be processed; A heating device, the heating device comprising a heating box, an input roller and an output roller, the heating box having a heating space, the input roller and the output roller both being located in the heating space, the input roller being used to feed the lithium strip to be processed into the heating space, the heating box being used to heat the lithium strip in the heating space into a lithium alloy strip, and the output roller being used to feed the lithium strip to be processed out of the heating space; a peeling device, the peeling device comprising a first peeling roller, a second peeling roller and a third peeling roller, the first peeling roller is used to peel off the first release film, the second peeling roller is used to peel off the first metal belt, and the third peeling roller is used to peel off the second release film; A winding device is used to wind up the lithium alloy strip.

2. The lithium belt preparation equipment according to claim 1, characterized in that: The rolling device comprises a first hot roller and a second hot roller, the first hot roller and the second hot roller are located on opposite sides of the lithium strip to be processed, the first heating temperature of the first hot roller and the second hot roller is T1, and the first heating temperature T1 satisfies: 20°C <T1<120℃。 3. The lithium ribbon preparation device according to claim 2, characterized in that: There is a distance W between the first heat roller and the second heat roller, and the distance W satisfies: 5 μm≤W≤20 μm.

4. The lithium ribbon preparation device according to claim 1, characterized in that: The heating box has a second heating temperature T2, and the second heating temperature T2 satisfies: 20°C <T2<120℃。 5. The lithium belt preparation equipment according to claim 1, characterized in that: The heating device further comprises a buffer belt structure, wherein the buffer belt structure comprises a plurality of tension rollers, and the plurality of tension rollers are arranged at intervals in a direction from the input roller to the output roller.

6. The lithium ribbon preparation device according to claim 5, characterized in that: The number of the plurality of tension rollers is greater than or equal to 6 and less than or equal to 22.

7. The lithium ribbon preparation device according to claim 1, characterized in that: The lithium strip preparation equipment also includes a feeding device, which includes a first feeding roller, a second feeding roller, a third feeding roller and a fourth feeding roller, the first feeding roller is connected to the first stripping roller and is used to feed the first release film into the rolling device, the second feeding roller is connected to the second stripping roller and is used to feed the first metal strip into the rolling device, the third feeding roller is used to feed the lithium strip into the rolling device, and the fourth feeding roller is connected to the third stripping roller and is used to feed the second release film into the rolling device.

8. The lithium ribbon preparation device according to claim 7, characterized in that: The lithium strip to be processed also includes a second metal strip, which is located between the lithium strip and the second release film. The feeding device also includes a fifth feeding roller. The stripping device also includes a fourth stripping roller, which is connected to the fourth stripping roller and is used to feed the second metal strip into the rolling device.

9. The lithium ribbon preparation device according to claim 1, characterized in that: The output roller further comprises a first positioning roller and a second positioning roller, wherein the first positioning roller and the second positioning roller are located on opposite sides of the lithium strip to be processed.

10. A method for preparing a lithium ribbon, applied to the lithium ribbon preparation device according to any one of claims 1 to 9, characterized in that: The lithium belt preparation method comprises the following steps: heating the roller pressing device to a first heating temperature; Feeding the lithium strip to be processed into the rolling device, and heating the heating space to a second heating temperature; The lithium strip to be processed after being pressed by the roller pressing device is fed into the heating space by the input roller, and heated in the heating space for a preset time; Determining whether the lithium strip to be processed has been heated for the preset time; If the lithium strip to be processed is heated to the preset time, the output roller is controlled to send out the lithium strip to be processed, and the first release film is peeled off by the first peeling roller, the first metal strip is peeled off by the second peeling roller, the second release film is peeled off by the third peeling roller, and the winding device winds up the lithium alloy strip.

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