Device and method for preparing edge type copper-lithium composite belt
The stepped composite process solves the problems of small tabs and low lithium content in the production of copper-lithium composite strips, achieving high energy density and high-efficiency production, avoiding edge wrinkles and cracks, and reducing production costs.
Patent Information
- Application Number
- CN202511536714.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-25
- Publication Date
- 2025-12-05
AI Technical Summary
In the current production of copper-lithium composite strips, the tabs are small and prone to wrinkling, and the lithium strip ratio is low, which limits the energy density of batteries and the development of solid-state batteries.
A stepped composite process is adopted, which combines a rolling forming system, a roll forming system, and a buffer system to achieve stepped composite of lithium strip and copper foil, reducing stress and avoiding edge wrinkles and cracks.
It improves the energy density per unit mass, reduces production costs, enhances product quality and production efficiency, and enables the preparation of ultrathin copper-lithium composite strips.
Smart Images
Figure CN121060952A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of batteries, in particular to a preparation device and method of edge type copper-lithium composite tape. BACKGROUND
[0002] With the development of battery technology, lithium batteries are widely used in aerospace, computers, mobile communication devices and electric vehicles due to their high energy density, long cycle life and wide application temperature range. In order to further improve the energy density of lithium batteries, using metal lithium as a negative electrode material to replace the traditional carbon material negative electrode has become an important development direction.
[0003] Metal lithium is used in secondary batteries and solid-state batteries, especially lithium-copper composite tapes using copper foil as a current collector for large-size batteries, which usually require a large width. In the conventional copper-lithium composite tape production process, two metal lithium tapes are combined on the middle copper foil to form a layered structure with metal lithium partially or completely covering the copper foil, as shown in FIGS. Figure 1 and Figure 2 This results in small tabs and wrinkles in the lithium tape at the tabs, affecting the production of subsequent battery processes and battery performance. The density difference between copper and lithium also results in a low proportion of active material metal lithium (not more than 25%) in the same unit volume, greatly limiting the improvement of the unit mass energy density of the battery and the technical development of solid-state batteries.
[0004] Therefore, how to provide a preparation device and method of edge type copper-lithium composite tape has become a technical problem that technicians in the field urgently need to solve. SUMMARY
[0005] To solve at least one technical problem in the background art, the present application provides a preparation device and method of edge type copper-lithium composite tape, which realizes stepwise compounding, changes the full roller rolling and compounding to rolling and compounding at the step, reduces the stress degree of the lithium tape and the composite tape, avoids edge wrinkles, edge cracks and other situations, and improves product quality and production efficiency.
[0006] To achieve the above purpose, the present application provides a preparation device of edge type copper-lithium composite tape, comprising: a mounting back plate, a rolling forming system, a rolling compounding system and a buffer system; the rolling forming system is installed on the left part of the mounting back plate for rolling the metal lithium tape into a convex lithium tape; the buffer system is installed on the middle part of the mounting back plate for buffering the special-shaped lithium tape; the rolling compounding system is installed on the right part of the mounting back plate for rolling the lithium tape and the copper foil into a composite tape.
[0007] Further, the rolling forming system comprises a first unwinding device, a second unwinding device, a third unwinding device, a first winding device, a profiled roller, a first roller and a first motor; a roll of PET release film is placed on the first unwinding device, a roll of lithium ribbon is placed on the second unwinding device, and a roll of BOPP protective film A is placed on the third unwinding device; the lithium ribbon, the PET release film and the BOPP protective film A pass through the profiled roller and the first roller of the rolling forming system at the same time, and after the lithium ribbon is rolled and formed, the PET release film is collected by the first winding device; the first motor drives the first roller to move up and down to provide rolling force for calendering.
[0008] Further, one side of the profiled roller is a ring-shaped groove or the middle part is a ring-shaped groove, which can prepare a one-side type or double-side type stepped lithium ribbon.
[0009] Further, the buffer system comprises self-weight floating rollers and a buffer group; the self-weight floating rollers are provided in plurality and installed on the buffer group; the buffer group is used for storing the rolled stepped metal lithium ribbon and regulating the rolling and composite speed difference.
[0010] Further, the buffer group comprises a first buffer, a second buffer, a third buffer, a fourth buffer and four slide rails, the self-weight floating rollers are slidingly arranged on the four slide rails, and the four self-weight floating rollers are arranged in an up-and-down staggered manner with the first buffer, the second buffer, the third buffer and the fourth buffer.
[0011] Further, the roller compounding system comprises a fourth unwinding device, a fifth unwinding device, a second winding device, a third winding device, a second roller, a third roller and a second motor; a copper foil is placed on the fifth unwinding device, and another roll of BOPP protective film B is placed on the fourth unwinding device; the lithium ribbon with the BOPP protective film A, the copper foil and the other roll of BOPP protective film B from the buffer system enter the second roller and the third roller of the roller compounding system at the same time to be compounded into a copper-lithium composite ribbon; after the copper-lithium composite ribbon is formed, the BOPP protective film A is collected by the second winding device, and then the copper-lithium composite ribbon and the BOPP protective film B are collected by the third winding device; the second motor drives the third roller to move forward and backward to provide rolling force for compounding.
[0012] Further, the profiled roller and the first roller in the rolling forming system are provided with a first deviation rectifying device in front, and the second roller and the third roller in the roller compounding system are provided with a second deviation rectifying device in front, so that the lithium ribbon and the copper foil do not deviate during operation.
[0013] Further, a first tension sensing roller is arranged between the roll pressing and buffering system; a second tension sensing roller is arranged between the fifth unwinding device and the second roller; and a third tension sensing roller is arranged between the second roller and the third winding device.
[0014] Further, a metering device is arranged in front of the third winding device to count the length of the product.
[0015] A preparation method of an edge type copper-lithium composite tape, comprising the following steps: Step S1, preparing a roll of lithium tape, a roll of copper foil, two rolls of BOPP protective film and a roll of PET release film; Step S2, placing a roll of PET release film on the first unwinding device, a roll of lithium tape on the second unwinding device, and a roll of BOPP protective film A on the third unwinding device; Step S3, passing the lithium tape, the PET release film and the BOPP protective film through the profiled roller and the first roller of the roll pressing and forming system at the same time, collecting the PET release film by the first winding device after the lithium tape is pressed and formed, and collecting the other materials into the buffering system; Step S4, placing the copper foil on the fifth unwinding device and another roll of BOPP protective film B on the fourth unwinding device; Step S5, simultaneously feeding the lithium tape with the BOPP protective film A, the copper foil and the other roll of BOPP protective film B out of the buffering system into the second roller and the third roller of the roll pressing and composite system to form a copper-lithium composite tape; Step S6, collecting the BOPP protective film A by the second winding device after the copper-lithium composite tape is formed, and then collecting the copper-lithium composite tape and the BOPP protective film B together by the third winding device; Step S7, packaging the copper-lithium composite tape product into bags; Step S8, repeating the above steps to repeatedly prepare the copper-lithium composite tape.
[0016] The present application has the following advantages: 1. The copper-lithium composite tape is changed from full coverage composite to step composite, the mass ratio of lithium in unit mass is increased to more than 60, and the energy density of unit mass is greatly improved; 2. The step composite can freely select the width of the lithium tape and the copper foil, and can leave longer tabs to reduce production cost; 3. The step composite changes the full roller pressing and composite to pressing and composite at the step, reduces the stress degree of the lithium tape and the composite tape, avoids edge wrinkles, edge cracks and other situations, and improves the product quality and production efficiency; 4、Step composite, the thickness of copper lithium composite area is consistent with the thickness of pure lithium belt, which can prepare ultra-thin copper lithium composite belt, and does not need to provide more ultra-thin lithium belt as raw material, greatly reducing the production cost. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 It is a top view of the existing copper lithium composite belt; Figure 2 It is a side view of the existing copper lithium composite belt; Figure 3 It is a top view of the edge type copper lithium composite belt with single side copper foil cladding; Figure 4 It is a side view of the edge type copper lithium composite belt with single side copper foil cladding; Figure 5 It is a top view of the edge type copper lithium composite belt with double side copper foil cladding; Figure 6 It is a side view of the edge type copper lithium composite belt with double side copper foil cladding; Figure 7 It is a structural schematic diagram of the profiled roller of the application; Figure 8 It is another structural schematic diagram of the profiled roller of the application; Figure 9 It is a structural schematic diagram of the single side step type lithium belt of the application; Figure 10 It is a structural schematic diagram of the double side step type lithium belt of the application; Figure 11 It is a schematic diagram of the composite position of the step type lithium belt and copper foil in the method of the application; Figure 12 It is a structural schematic diagram of the device of the application.
[0018] In the figure, 1 is a first unwinding device, 2 is a second unwinding device, 3 is a third unwinding device, 4 is a profiled roller, 5 is a first roller, 6 is a first motor, 7 is a first winding device, 8 is a fourth unwinding device, 9 is a slide rail, 10 is a self-weight floating roller, 11 is a first buffer, 12 is a second buffer, 14 is a third buffer, 15 is a fourth buffer, 16 is a first deviation rectifying device, 17 is a first tension sensing roller, 18 is a second tension sensing roller, 19 is a second winding device, 20 is a second roller, 21 is a third roller, 22 is a second motor, 23 is a third tension sensing roller, 24 is a third winding device, 26 is a meter counter, 27 is a second deviation rectifying device, 28 is a fifth unwinding device, and 29 is a mounting back plate. DETAILED DESCRIPTION
[0019] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only 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 creative work belong to the scope of protection of the present application.
[0020] It should be noted that the terms "first", "second" and the like in the description of the specification and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or a chronological sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented. In addition, the terms "comprise" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units does not necessarily limit to those clearly listed steps or units, but can include other steps or units not clearly listed or inherent to the process, method, product or device.
[0021] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.
[0022] In addition, in addition to indicating the orientation or positional relationship, the above-mentioned part of the terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain dependent relationship or connection relationship in some cases. For those skilled in the art, the specific meaning of these terms in the present application can be understood according to the specific circumstances.
[0023] In addition, the terms "mount", "set", "provided with", "connect", "connect", "socket" should be broadly understood. For example, it can be fixedly connected, detachably connected, or integrally constructed; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or internal communication between two devices, elements or components. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0024] To achieve the above-mentioned purpose, as Figure 12As shown, the present application provides a preparation device of edge type copper-lithium composite tape, comprising: a mounting back plate 29, a rolling forming system, a roll composite system and a buffer system; the rolling forming system is installed on the left part of the mounting back plate 29, used for rolling the metal lithium tape into a convex lithium tape; the buffer system is installed on the middle part of the mounting back plate 29, used for buffering the profiled lithium tape; the roll composite system is installed on the right part of the mounting back plate 29, used for rolling the lithium tape and the copper foil into a composite tape. The mounting back plate 29 serves as the mounting carrier of the functional components.
[0025] The rolling forming system comprises a first unwinding device 1, a second unwinding device 2, a third unwinding device 3, a first winding device 7, a profiled rolling roller 4, a first rolling roller 5 and a first motor 6; a roll of PET release film is placed on the first unwinding device 1, a roll of lithium tape is placed on the second unwinding device 2, and a roll of BOPP protective film A is placed on the third unwinding device 3; the lithium tape, the PET release film and the BOPP protective film A pass through the profiled rolling roller 4 and the first rolling roller 5 of the rolling forming system at the same time, after the lithium tape is rolled and formed, the PET release film is collected by the first winding device 7, realizing the waste film winding of the PET release film; the first motor 6 drives the first rolling roller 5 to move up and down, providing rolling force for the calendering. The profiled rolling roller 4 and the first rolling roller 5 are used to cooperate with each other to calender the lithium tape into a stepped lithium tape.
[0026] In specific use, the first motor 6 is adjusted according to the thickness requirement of the product, so as to adjust the gap between the profiled rolling roller 4 and the first rolling roller 5, so as to ensure that the rolling product thickness meets the requirements.
[0027] Further optimization of the technical scheme, one side of the profiled rolling roller 4 is a ring groove or the middle part is a ring groove, which can prepare a one-side type or double-side type stepped lithium tape.
[0028] The buffer system comprises a self-weight floating roller 10 and a buffer group; the self-weight floating roller 10 is provided in plurality and installed on the buffer group; the buffer group is used to store the rolled stepped metal lithium tape and control the rolling and composite speed difference.
[0029] The buffer group comprises a first buffer 11, a second buffer 12, a third buffer 14, a fourth buffer 15 and four slide rails 9; the self-weight floating roller 10 is slidingly arranged on the four slide rails 9, and the four self-weight floating rollers 10 are arranged in an up-and-down staggered manner with the first buffer 11, the second buffer 12, the third buffer 14 and the fourth buffer 15, used to store the rolled stepped metal lithium tape and control the rolling and composite speed difference.
[0030] In the implementation process, the number and position of the guide auxiliary rollers of the buffer group can be set according to the production scale to adapt to the production of different specifications of products.
[0031] In the implementation process, the rolling and compounding speeds are set to be consistent, and when there is a slight difference, the length difference of the two is compensated or temporarily stored through the buffer.
[0032] The roll compounding system comprises a fourth unwinding device 8, a fifth unwinding device 28, a second winding device 19, a third winding device 24, a second roller 20, a third roller 21 and a second motor 22; the copper foil is placed on the fifth unwinding device 28, and another BOPP protective film B is placed on the fourth unwinding device 8; the lithium strip with the BOPP protective film A, the copper foil and another BOPP protective film B coming out of the buffer system are simultaneously compounded into a copper-lithium composite strip in the second roller 20 and the third roller 21 of the roll compounding system; after the copper-lithium composite strip is formed, the BOPP protective film A is collected by the second winding device 19, realizing the winding of the waste film of the first BOPP protective film A, and then the copper-lithium composite strip and the BOPP protective film B are collected together by the third winding device 24; the second motor 22 drives the third roller 21 to move forward and backward to provide rolling force for compounding. In specific use, the lead-out distance of the screw rod of the second motor 22 is adjusted according to the thickness requirement of the product, so as to adjust the gap between the second roller 20 and the third roller 21, so as to ensure that the compounding effect meets the requirements of the product thickness compounding requirements.
[0033] Further optimization of the technical scheme, the profiled roller 4 in the rolling forming system and the first roller 5 are provided with a first deviation correcting device 16 in front, and the second roller 20 and the third roller 21 in the roll compounding system are provided with a second deviation correcting device 27 in front, which can make the lithium strip and the copper foil run without deviation. In the implementation process, the deviation correcting device is used to control the relative position between the strips, which can be set according to the measurement results to adapt to the production of different specifications of products.
[0034] In specific use, the setting parameters of the first deviation correcting device 16 and the second deviation correcting device 27 are adjusted according to the alignment position after compounding, so as to ensure that the shape and position tolerances of the composite strip meet the requirements.
[0035] Further optimization of the technical scheme, a first tension sensing roller 17 is arranged between the roll compounding system and the buffer system; a second tension sensing roller 18 is arranged between the fifth unwinding device 28 and the second roller 20, and a third tension sensing roller 23 is arranged between the second roller 20 and the third winding device 24. In the implementation process, the tension sensing roller is used to detect the tension of the strip and feed back to the corresponding unwinding device and winding device to control the tension of the strip.
[0036] Further optimization of the technical scheme, a meter 26 is placed in front of the third winding device 24 for counting the length of the product.
[0037] The application further provides a preparation method of the edge type copper-lithium composite tape. Step S1, a roll of lithium tape, a roll of copper foil, two rolls of BOPP protective film and a roll of PET release film are prepared; Step S2, a roll of PET release film is placed on the first unwinding device, a roll of lithium tape is placed on the second unwinding device, and a roll of BOPP protective film A is placed on the third unwinding device; Step S3, the lithium tape, the PET release film and the BOPP protective film are simultaneously passed through the profiled roll and the first roll of the rolling forming system, after the lithium tape is rolled and formed, the PET release film is collected by the first winding device, and the other materials enter the buffer system; Step S4, the copper foil is placed on the fifth unwinding device, and another roll of BOPP protective film B is placed on the fourth unwinding device; Step S5, the lithium tape with the BOPP protective film A, the copper foil and the other roll of BOPP protective film B out of the buffer system are simultaneously entered into the second roll and the third roll of the roller compounding system to be compounded into a copper-lithium composite tape; Step S6, after the copper-lithium composite tape is formed, the BOPP protective film A is collected by the second winding device, and then the copper-lithium composite tape and the BOPP protective film B are collected together by the third winding device; Step S7, the copper-lithium composite tape product is packaged into bags; Step S8, the above steps are repeated to prepare the copper-lithium composite tape.
[0038] The application changes the copper-lithium composite tape from full coverage compounding to step compounding, improves the mass proportion of metal lithium in unit mass to more than 60, greatly improves the energy density of unit mass, and reduces the production cost.
[0039] Embodiment
[0040] Reference Figures 3-11 The embodiment provides a preparation method of the edge type copper-lithium composite tape, and contains the following steps: (the planned production specification is: the total thickness is 0.04 mm, the width is 100 mm, the tab length is 5 mm, and the copper foil thickness of the new structure composite tape is 0.006 mm.
[0041] Step 1, prepare a 200m long metal lithium strip, a 1000m long copper foil and two 1000m long BOPP protective film, a 1000m long PET release film. The specifications of the metal lithium strip are: thickness 0.2mm, width 98mm; the specifications of the copper foil are: thickness 0.006mm, width 10mm; the specifications of the BOPP protective film are: thickness 0.038mm, width 120mm; the specifications of the PET release film are: thickness 0.036mm, width 130mm.
[0042] Step 101, install a roll of metal lithium strip on the second unwinding device 2, manually pull through the second deviation device 27, then pass through the profiled roller 4 and the first roller 5, pass through the first buffer 12, the second buffer 13, the third buffer 14, the fourth buffer 15, then pass through the first tension sensing roller 17, pass through the second roller 20 and the third roller 21, and finally pass through the third tension sensing roller 23 and the metering device 26 to be fixed on the third winding device 24. Set: the magnetic powder voltage curve parameter of the second unwinding device 2 is 8.5-5.5v; the position of the profiled roller 4 is 3.482mm; the upper and lower limits of the deviation photosensitive are 1400-1500; the position of the third roller 21 is 3.455mm, and the winding tension of the finished product is 1200g.
[0043] Step 102, install a roll of PET release film on the first unwinding device 1, and place a roll of BOPP protective film A on the third unwinding device 3, manually pull to the waste diaphragm first winding device 7, so that the PET release film and the BOPP protective film A are on the upper and lower sides of the metal lithium strip and completely cover the metal lithium strip. Set the magnetic powder voltage curve parameter of the first unwinding device 1 and the third unwinding device 3 to 20-15v.
[0044] Step 103, install another roll of BOPP protective film B on the fourth unwinding device 8 on the right side of the device, manually pull through the second roller 20 and the third roller 21, pass through the third tension sensing roller 23 and the metering device 26, and be fixed on the third winding device 24 together with the lithium strip. Set the magnetic powder voltage curve parameter of the fourth unwinding device 8 to 11-8v.
[0045] Step 104, install a roll of copper foil on the fifth unwinding device 28, pass through the first deviation device 16, the second tension sensing roller 18, the second roller 20, the third roller 21, the third tension sensing roller 23, and the metering device 26, and connect to the third winding device 24. Set the magnetic powder voltage curve parameter of the fifth unwinding device 28 to 6-4v, the upper and lower limits of the photosensitive of the first deviation device 16 are 1400-1500, and the tension of the second tension sensing roller 18 is 300g.
[0046] Step 2, roll the metal lithium strip through the profiled roller under the protection of the PET release film and the BOPP protective film A to form a stepped lithium strip with a step height of 0.005-0.006mm.
[0047] Step 201, start the device, the third winding device 24 pulls the left lithium strip to the first roller 5, the profile roller 4, the first winding device 7 and the second winding device 19 pull the corresponding diaphragm to the first roller 5 and the profile roller 4, and the magnetic powder voltage curve parameters 8-10v of the first winding device 7 and the second winding device 19 are set.
[0048] Step 202, the first roller 5 is pushed to the profile roller 4 by the first motor, and the speed of the device is set to 10m / min.
[0049] Step 203, the stepped metal lithium strip is calendered by the cooperation of the first roller 5 and the profile roller 4, the width of the thinning area is controlled by the second deviation correcting device 27, and the width of the stepped area is controlled to be 5mm by the second deviation correcting device 27.
[0050] Step 204, the tension of the lithium strip after rolling in the buffer area is detected by the first tension sensing roller 17, and four 50g self-weight floating rollers 10 are respectively installed on the first buffer 12, the second buffer 13, the third buffer 14 and the fourth buffer 15.
[0051] Step 3, a roll of copper foil is compounded with the aforementioned stepped lithium strip under the protection of a roll of protective film, and the copper foil edge is aligned with the stepped position of the lithium strip.
[0052] Step 301, when the aforementioned rolled stepped metal lithium strip runs to the middle of the second roller 20 and the third roller 21, press the compounding button, the second motor 22 pushes the third roller 21 to approach the second roller 20, and the copper foil is compounded on the stepped position of the stepped lithium strip, and the rotating speed is set to 10m / min.
[0053] Step 302, the relative position of the stepped lithium strip and the copper foil is adjusted by the second deviation correcting device 27 and the first deviation correcting device 16, so that the copper foil is aligned with the stepped position of the stepped lithium strip, and the upper and lower limits of the photosensitive are set to 1400-1500.
[0054] Step 4, the compounded copper-lithium composite strip is wound.
[0055] Step 401, the winding tension of the finished product is controlled by the third tension sensing roller 23, and the tension is set to 1200g.
[0056] Step 402, the meter 26 detects the length of the compounded composite strip.
[0057] The above is only the preferred embodiment of the present application, and does not limit the technical scope of the present application, so any slight modification, equivalent change and modification made according to the technical essence of the present application to the above embodiment are still within the scope of the technical solution of the present application.
Claims
1. An apparatus for preparing an edge type copper-lithium composite strip, characterized by comprising: It comprises: The installation backboard, the roll forming system, the roll bonding system and the buffer system; the roll forming system is installed on the left part of the installation backboard, and is used for rolling the metal lithium strip into a convex lithium strip; the buffer system is installed on the middle part of the installation backboard, and is used for buffering the profiled lithium strip; the roll bonding system is installed on the right part of the installation backboard, and is used for roll bonding the lithium strip and the copper foil into a composite strip.
2. The apparatus for preparing an edge type copper-lithium composite strip according to claim 1, wherein The roll forming system comprises a first unwinding device, a second unwinding device, a third unwinding device, a first winding device, a profiled roll, a first roll and a first motor; a roll of PET release film is placed on the first unwinding device, a roll of lithium strip is placed on the second unwinding device, and a roll of BOPP protective film A is placed on the third unwinding device; The lithium strip, the PET release film and the BOPP protective film A pass through the profiled roll and the first roll of the roll forming system at the same time, and after the lithium strip is rolled and formed, the PET release film is collected by the first winding device; the first motor drives the first roll to move up and down.
3. The apparatus of claim 2, wherein the apparatus further comprises a cooling device for cooling the copper-lithium composite strip. One side of the profiled roll is a ring-shaped groove or the middle part is a ring-shaped groove.
4. The apparatus of claim 3, wherein the apparatus further comprises a cooling device for cooling the copper-lithium composite strip. The buffer system comprises a self-weight floating roll and a buffer set; the self-weight floating roll is provided with a plurality of self-weight floating rolls, which are installed on the buffer set.
5. The apparatus of claim 4, wherein the apparatus further comprises a cooling device for cooling the copper-lithium composite strip. The buffer set comprises a first buffer, a second buffer, a third buffer, a fourth buffer and four slide rails; the self-weight floating roll is slidably arranged on the four slide rails, and the four self-weight floating rolls are arranged in an up-and-down staggered manner with the first buffer, the second buffer, the third buffer and the fourth buffer.
6. The apparatus for preparing an edge-type copper-lithium composite strip as described in claim 5, characterized in that, The roll bonding system comprises a fourth unwinding device, a fifth unwinding device, a second winding device, a third winding device, a second roll, a third roll and a second motor; the copper foil is placed on the fifth unwinding device, and another roll of BOPP protective film B is placed on the fourth unwinding device; the lithium strip with the BOPP protective film A, the copper foil and another roll of BOPP protective film B from the buffer system enter the second roll and the third roll of the roll bonding system at the same time to be compounded into a copper-lithium composite strip; After the copper-lithium composite strip is formed, the BOPP protective film A is collected by the second winding device, and then the copper-lithium composite strip and the BOPP protective film B are collected by the third winding device; The second motor drives the third roll to move forward and backward.
7. The apparatus of claim 6, wherein the apparatus further comprises a cooling device for cooling the copper-lithium composite strip. The profiled roll and the first roll in the roll forming system are provided with a first deviation correcting device in front of them, and the second roll and the third roll in the roll bonding system are provided with a second deviation correcting device in front of them.
8. The apparatus of claim 7, wherein the apparatus further comprises a cooling device for cooling the copper-lithium composite strip. A first tension sensing roll is arranged between the roll bonding system and the buffer system; a second tension sensing roll is arranged between the fifth unwinding device and the second roll, and a third tension sensing roll is arranged between the second roll and the third winding device.
9. The apparatus of claim 8, wherein the apparatus further comprises a cooling device for cooling the copper-lithium composite strip. A metering device is placed in front of the third winding device.
10. A method of producing an edge type copper-lithium composite strip, characterized by, It comprises the following steps: Step S1, preparing a roll of lithium strip, a roll of copper foil, two rolls of BOPP protective film and a roll of PET release film; Step S2, placing a roll of PET release film on the first unwinding device, a roll of lithium strip on the second unwinding device, and a roll of BOPP protective film A on the third unwinding device; Step S3, the lithium strip, PET release film, BOPP protective film pass through the profiled roll and the first roll of the roll forming system at the same time, after the lithium strip is formed by rolling, the PET release film is collected by the first winding device, and other materials enter the buffer system; Step S4, the copper foil is placed on the fifth unwinding device, and another BOPP protective film B is placed on the fourth unwinding device; Step S5, the lithium strip with BOPP protective film A, copper foil and another BOPP protective film B out of the buffer system are simultaneously compounded into copper lithium composite strip in the second roll and the third roll of the roll compounding system; Step S6, after the copper lithium composite strip is formed, the BOPP protective film A is collected by the second winding device, and then the copper lithium composite strip and the BOPP protective film B are collected by the third winding device together; Step S7, the copper lithium composite strip product is packaged into bags; Step S8, repeat the above steps to prepare the copper lithium composite strip.