Intermittent lithium copper composite belt preparation system

Abstract

The utility model provides an intermittent lithium copper composite belt preparation system, and relates to the technical field of lithium battery materials. The preparation system comprises a lithium strip unwinding device, a first PET base material film release agent coating device, a second PET base material film release agent coating device and a current collector compounding device. Wherein the main component of an oil material in the release agent coating device is silicone oil, and the drying device is matched, so that the product performance is prevented from being influenced by the residue of a release agent. After the PET base material film is conveyed out of the coating device, strong release force areas with preset lengths and uniformly spaced in the length direction of the PET base material film can be realized, and the current collector compounding device is arranged, so that simultaneous rolling of double single-sided intermittent composite lithium strips or preparation of double-sided intermittent composite lithium strips is realized, and the processing efficiency is improved; in addition, the prepared intermittent lithium-copper composite belt can effectively meet the requirements of different battery capacities on the width of the tab and the size of the pole piece and the problem that the tab with any width cannot be reserved in the length direction of the pole piece.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery materials, and in particular to an intermittent lithium-copper composite strip preparation system. Background Art

[0002] Currently, lithium batteries, as the primary energy storage device, are widely used not only in portable electronic products but also in the automotive industry due to their high operating voltage, excellent cycle performance, high energy density and power density, and environmental friendliness. With the development of high-end battery products and the increase in vehicle range, the current mass-produced graphite anode material for lithium-ion batteries has reached its theoretical limit (372mAh / g), necessitating the development of new materials to advance battery products and meet diverse consumer needs.

[0003] Lithium metal has high capacity (theoretical 3860 mAh / g), low density (0.534 g / cm 3 ), low electrochemical potential (-3.040V vs. standard hydrogen electrode). Therefore, lithium secondary batteries using lithium metal as the negative electrode have the characteristics of high energy density and high voltage. In particular, when using copper foil as the current collector, lithium-copper composite strips for large-sized batteries are generally required to have a large width. The conventional production process is to continuously laminate lithium metal foil and copper foil, reserving the tab in the width direction. The lithium coverage area of ​​this pole piece is relatively narrow and cannot meet the size requirements of some current manufacturers, such as blade batteries (2500*118*13.5 (mm)). In addition, only one lithium-copper composite strip can be obtained at a time, which is inefficient.

[0004] Chinese patent CN216928627U, titled "Lithium-copper composite strip, lithium-copper composite negative electrode and battery": discloses a method for preparing a lithium-copper composite strip in which a release agent is coated without a drying device, resulting in residual release agent that affects battery performance.

[0005] Chinese patent CN219483774U, the patent name is Roller structure and lithium-copper composite strip: it discloses a roller structure, but the size of the composite strip of this structure depends entirely on the diameter of the roller, and the range of tab sizes is small. If you want to prepare a composite strip of a wider size, you need to increase the roller diameter, which increases equipment costs and reduces stability.

[0006] Chinese patent CN116811406A, the patent name is a structure and method for manufacturing an interval-type lithium-copper composite belt; Chinese patent CN220431817U, the patent name is a device for manufacturing a lithium-copper composite belt: Both patents disclose a structure and method for manufacturing an interval-type composite belt, but both use lasers to cut the lithium belt. Laser cutting of the lithium belt will form burn marks and produce a large amount of lithium powder, which may affect the performance of the electrode.

[0007] None of the above patents mentions the possibility of simultaneously preparing two single-sided intermittent composite lithium strips.

[0008] In view of this, this application is specially filed to improve or ameliorate the above situation. Utility Model Content

[0009] The purpose of the present invention is to provide an intermittent lithium-copper composite strip preparation system, which can effectively solve the requirements of different battery capacities on the width of the pole tab and the size of the pole piece and the problem that the pole piece cannot leave pole tabs of arbitrary width in the length direction; in addition, the intermittent lithium-copper composite strip preparation system provided by the present invention realizes the simultaneous rolling of two single-sided intermittent composite lithium strips and the preparation of double-sided intermittent composite lithium strips.

[0010] The embodiment of the present utility model is achieved as follows:

[0011] The embodiment of the present invention provides an intermittent lithium-copper composite strip preparation system, which includes:

[0012] Lithium tape unwinding device;

[0013] The first PET substrate film release agent coating device and the second PET substrate film release agent coating device are respectively used to form strong release force areas of preset lengths evenly spaced along the length direction of the PET substrate films on the two PET substrate films, and the interval length between each two adjacent strong release force areas is the preset length of the strong release force area;

[0014] The lithium strip rolling device includes a pair of roller synchronous rolling mechanisms. Two PET substrate films on opposite sides transmitted by the first PET substrate film release agent coating device and the second PET substrate film release agent coating device synchronously enter the pair of roller synchronous rolling mechanisms, and the strong release force areas on the two PET substrate films are staggered and opposite to each other; the lithium strip unwound by the lithium strip unwinding device and the two PET substrate films on opposite sides synchronously enter the pair of roller synchronous rolling mechanisms, and the lithium strips are respectively bonded to the strong release force areas of the two PET substrate films;

[0015] And, a current collector composite device is used to composite the current collector with two PET substrate films bonded with lithium strips.

[0016] In an optional embodiment of the present invention, the first PET substrate film release agent coating device and the second PET substrate film release agent coating device are respectively provided with a release agent coating device;

[0017] The release agent coating device includes an operating interface and a swing-arm robot. By inputting the specification data of the PET substrate film, the area data of the strong release force zone and the corresponding release force data on the operating interface, the swing arm angle of the swing-arm robot and the amount of oil required for coating are controlled, so as to achieve the setting of strong release force zones of preset length with uniform intervals in the longitudinal direction of the PET substrate film.

[0018] In an optional embodiment of the present invention, the release agent coating device further includes a metering roller, a transfer roller, a feeding roller, and an oil cylinder. The metering roller is connected to the oil cylinder and transfers the oil in the oil cylinder to the transfer roller. The transfer roller transfers the oil to the feeding roller. The feeding roller coats the oil on the surface of the PET substrate film, coating the strong release force areas of a preset length uniformly spaced in the longitudinal direction of the PET substrate film.

[0019] A sensor for controlling the oil volume is provided in the oil cylinder.

[0020] In an optional embodiment of the present invention, the first PET substrate film release agent coating device and the second PET substrate film release agent coating device are respectively provided with a PET substrate film unwinding device and a drying device;

[0021] The PET substrate film unwinding device is arranged upstream of the release agent coating device, and the drying device is arranged downstream of the release agent coating device;

[0022] The drying device includes an infrared radiator or a heating device.

[0023] In an optional embodiment of the present invention, the first PET substrate film release agent coating device and the second PET substrate film release agent coating device are further provided with a tension control device and a deviation correction device respectively;

[0024] The tension control device is arranged downstream of the drying device, and the deviation correction device is arranged between the tension control device and the lithium strip rolling device;

[0025] The two PET substrate films transmitted from the parallel relative deviation correcting devices and the lithium ribbon unwound by the lithium ribbon unwinding device synchronously enter the roller synchronous rolling mechanism of the lithium ribbon rolling device.

[0026] In an optional embodiment of the present invention, the current collector composite device is a single-sided intermittent lithium-copper composite tape preparation device and a double-sided intermittent lithium-copper composite tape preparation device arranged in parallel.

[0027] In an optional embodiment of the present invention, the single-sided intermittent lithium-copper composite strip preparation device includes a first copper strip unwinding device, a first intermittent Li-PET & copper strip composite rolling device, a second copper strip unwinding device and a second intermittent Li-PET & copper strip composite rolling device; the first intermittent Li-PET & copper strip composite rolling device and the second intermittent Li-PET & copper strip composite rolling device each include a pair of roller synchronous rolling mechanisms;

[0028] Among them, the copper strip unwinding device and the copper strip unwinding device respectively enter the first intermittent Li-PET & copper strip composite rolling device and the second intermittent Li-PET & copper strip composite rolling device simultaneously with the two PET substrate films with lithium strips on both sides transmitted by the lithium strip rolling device, and the copper strips are composited at the PET substrate film with lithium strips.

[0029] In an optional embodiment of the present invention, the double-sided intermittent composite lithium strip preparation device includes a third copper strip unwinding device and a third intermittent Li-PET & copper strip composite rolling device;

[0030] The two PET substrate films with lithium tape bonded on both sides transferred by the lithium tape rolling device are respectively transferred from both sides of the third copper tape unwinding device to the third intermittent Li-PET & copper tape composite rolling device synchronously with the copper tape unwinding device, and the copper tape is composited at the PET substrate film with lithium tape bonded.

[0031] In an optional embodiment of the present invention, a PET substrate film winding device, an intermittent lithium-copper composite strip winding device and a slitting device are further provided downstream of each intermittent Li-PET & copper strip composite rolling device;

[0032] It should be noted that the PET substrate film winding device in the double-sided intermittent composite lithium tape preparation device should be arranged at intervals, not on the same vertical line, and the distance between the two should be adjustable, and equal to the length of the strong release force area or the weak release force area on the PET film.

[0033] The slitting device is provided with a slitting port for separating the intermittent lithium-copper composite tape and the PET substrate film.

[0034] In an optional embodiment of the present invention, the intermittent lithium-copper composite tape preparation system includes a lithium tape unwinding device, a PET substrate film unwinding device, first to third copper tape unwinding devices, a PET substrate film winding device, and an intermittent lithium-copper composite tape winding device, all of which are equipped with a power supply device;

[0035] The intermittent lithium-copper composite strip preparation system also includes a plurality of non-powered guide rollers.

[0036] The beneficial effects of the embodiments of the present utility model are:

[0037] The utility model provides an intermittent lithium-copper composite strip preparation system, which includes:

[0038] A lithium strip unwinding device; a first PET substrate film release agent coating device and a second PET substrate film release agent coating device, as well as a current collector composite device. The main component of the oil in the release agent coating device is silicone oil, and in conjunction with a drying device, it avoids the residual release agent from affecting the product performance. After the PET substrate film is transferred from the coating device, a strong release force zone of a preset length uniformly spaced along the length direction of the PET substrate film can be realized. In addition, the current collector composite device is arranged downstream of the lithium strip rolling device, thereby realizing the simultaneous rolling of two single-sided intermittent composite lithium strips or the preparation of double-sided intermittent composite lithium strips, thereby improving processing efficiency. The intermittent lithium-copper composite strip prepared by the utility model can effectively solve the requirements of different battery capacities for the width of the pole tabs and the size of the pole pieces, and the problem that the pole pieces cannot leave pole tabs of arbitrary width in the length direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0040] Figure 1 A schematic diagram of the structure of a PET substrate film output from a release agent coating device according to an embodiment of the present invention;

[0041] Figure 2 This is a schematic diagram of a single-sided intermittent lithium-copper composite strip preparation system according to an embodiment of the present invention;

[0042] Figure 3 This is a schematic diagram of a double-sided intermittent lithium-copper composite tape preparation system according to an embodiment of the present invention;

[0043] Figure 4 This is a schematic structural diagram of a coating head in a coating device in an embodiment of the present utility model.

[0044] Icons: 100-PET substrate film; 101-strong release force area; 102-weak release force area; 200-single-sided intermittent lithium-copper composite tape preparation system; 300-first PET substrate film release agent coating device; 301-first PET substrate film unwinding device; 302-first release agent coating device; 303-first drying device; 304-first tension control device; 305-first deviation correction device; 400-second PET substrate film release agent coating device; 401-second PET substrate film unwinding device; 402-second release agent coating device; 403-second drying device; 404-second tension control device; 405-second deviation correction device; 410-lithium strip unwinding device; 420-lithium strip rolling device; 500-current collector composite device; 501-first copper strip unwinding device; 502-third tension control device; 503-first intermittent Li-PET & copper strip composite rolling device; 504-first PET substrate film winding device; 505- First slitting device; 506-first intermittent lithium-copper composite tape winding device; 510-second copper tape unwinding device; 511-fourth tension control device; 512-second intermittent Li-PET & copper tape composite rolling device; 513-second PET substrate film winding device; 514-second slitting device; 515-second intermittent lithium-copper composite tape winding device; 600-double-sided intermittent lithium-copper composite tape preparation system; 601-third copper tape unwinding device; 602-third intermittent Li -PET & copper strip composite rolling device; 603-third PET base film winding device; 604-third intermittent lithium-copper composite strip winding device; 605-third slitting device; 606-fourth PET base film winding device; 607-fourth tension control device; 700-first release agent coating device; 701-back roller (E); 702-feeding roller (A); 703-transfer roller (B); 704-metering roller (C); 705-metering roller (D); 706-oil cylinder. DETAILED DESCRIPTION

[0045] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0046] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0047] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0048] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is typically placed when in use. These terms are intended solely to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0049] Furthermore, terms such as "horizontal" and "vertical" do not necessarily mean that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0050] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0051] First embodiment

[0052] Please refer to Figure 2This embodiment provides a single-sided intermittent lithium-copper composite tape preparation system 200, comprising: a first PET substrate film release agent coating device 300, a second PET substrate film release agent coating device 400, a lithium tape unwinding device 410, a lithium tape rolling device 420, and a current collector composite device 500. The first PET substrate film release agent coating device 300 and the second PET substrate film release agent coating device 400 are two parallel production lines. The first PET substrate film release agent coating device 300 is provided with a first PET substrate film unwinding device 301, a first release agent coating device 302, and a first drying device 303, sequentially arranged along the direction of the PET substrate film. The second PET substrate film release agent coating device 400 is provided with a second PET substrate film unwinding device 401, a second release agent coating device 402, and a second drying device 403, sequentially arranged along the direction of the PET substrate film.

[0053] The PET substrate films unwound from the first and second PET substrate film unwinding devices 301 and 401 enter the corresponding first and second release agent coating devices 302 and 402, respectively, for coating in the strong release force zone 101. It should be noted that the unwinding guide rollers included in the PET substrate film unwinding devices in this embodiment are international standard 3-inch air shafts, and the substrate unwinding shafts are connected to a motor to provide power.

[0054] In other embodiments of the present invention, a 6-inch air shaft of international standard can be selected according to actual needs. A 6-inch sleeve can also be added to a 3-inch air shaft to match a 6-inch coiled core tube.

[0055] The first release agent coating device 302 and the second release agent coating device 402 are respectively provided with an operation interface and a swing arm robot. By inputting the specification data of the PET substrate film, the area data of the strong release force area 101 and the corresponding release force data into the operation interface, the swing arm angle of the swing arm robot and the amount of oil required for coating are controlled, so as to realize the setting of the strong release force area 101 of a preset length with uniform intervals in the longitudinal direction of the PET substrate film.

[0056] Specifically, the PET substrate film's specifications include its length and width. Corresponding to the area data for the strong release force zone 101 and its corresponding strong release force, the area data for the weak release force zone 102 and its corresponding weak release force data also need to be set. After inputting the required data into the user interface, the computer automatically calculates the required silicone oil dosage, the swing arm angle of the swing robot, the gap between the two transfer rollers, and other data, thereby completing the coating operation on the PET substrate film.

[0057] Please refer to Figure 4Taking the first release agent coating device 302 as an example, the coating head in the first release agent coating device 302 includes the following transfer rollers: metering roller (C) 704, metering roller (D) 705, transfer roller (B) 703, feeding roller (A) 702, and backing roller (E) 701. Among them, roller D, roller B, and roller E are mirror rollers used to control tension and ensure uniform coating of the oil; roller C and roller A are rubber rollers with steel cores, which have certain elasticity and wear resistance and are used to transfer the oil.

[0058] In addition, the first release agent coating device 302 also includes an oil cylinder 706. This oil cylinder 706 stores the silicone oil required for coating. A sensor for controlling the oil level is located within the oil cylinder 706, allowing operators to monitor the oil level in real time to avoid disrupting production. The second release agent coating device 402 has the same structure as the first release agent coating device 302.

[0059] The C roller and the D roller in the metering roller are arranged in parallel and connected to the oil cylinder 706. They can transfer the oil in the oil cylinder 706 to the transfer roller (B) 703. The transfer roller (B) 703 coats the oil on the surface of the PET substrate film through the feeding roller (A) 702.

[0060] It should be noted that the coating head in the release agent coating device is connected to the swing arm robot to control the angle between the transfer rollers.

[0061] Please refer to Figure 1 After the PET substrate film is transmitted from the release agent coating device, strong release force areas 101 of preset length are evenly spaced in the longitudinal direction of the PET substrate film, and the interval length between every two adjacent strong release force areas 101 is the preset length of the strong release force area 101; in addition, the strong release force areas 101 on the two PET substrate films 100 are staggered and opposite to each other; it should be noted that the preset length, interval length and area size of the strong release force areas 101 can be reasonably adjusted according to actual needs.

[0062] In this embodiment, strong release force zones 101 of preset lengths are evenly spaced in the longitudinal direction of the PET substrate film, which can effectively solve the requirements of different battery capacities on the width of the tabs and the size of the pole pieces, and the problem that the pole pieces cannot leave tabs of arbitrary width in the longitudinal direction.

[0063] Specifically, the silicone oil content is controlled to achieve coating of the strong release force area 101 and the weak release force area 102. Different silicone oil contents are set in the first release agent coating device 302 and the second release agent coating device 402, respectively, to achieve staggered and opposite strong release force areas 101 on the two PET substrate films.

[0064] Drying devices are respectively provided downstream of the first release agent coating device 302 and the second release agent coating device 402 to accelerate the evaporation of water or oil on the surface of the PET substrate film.

[0065] It should be noted that the drying device includes an infrared radiator or a heating device, and a reasonable selection should be made according to actual needs.

[0066] The drying device is a cylindrical structure with two openings on both sides, which is convenient for conveying the PET substrate film. The specific structure of the cylinder can be selected according to actual needs, such as cylindrical, cubic or rectangular box.

[0067] Specifically, this embodiment uses an infrared radiator, which is a drying method that utilizes the thermal radiation properties of infrared light. The principle is that the infrared radiator is installed above or on the side of the drying device. The radiated infrared energy is absorbed by the object and converted into heat energy, thereby increasing the object's temperature and accelerating the evaporation of its moisture or oil. Because the release agent applied in this embodiment is mainly composed of silicone oil, it also contains a catalyst, emulsifier, cross-linking agent, stabilizer, and anti-sticking agent. Therefore, no release agent remains on the surface of the PET substrate film after the drying process, which can effectively avoid affecting battery performance.

[0068] It should be noted that, other ingredients in the release agent except silicone oil can be reasonably selected according to actual needs, wherein the catalyst is selected from any one of chloroplatinic acid-divinyltetramethyldisiloxane, chloroplatinic acid-isopropyl alcohol, and chloroplatinic acid-diethyl phthalate; the emulsifier is selected from any one of dodecyldimethylbenzylammonium bromide and dodecyldimethylbenzylammonium chloride; the cross-linking agent is selected from any one of tetramethoxysilane, tetraethoxysilane, and methyltrimethoxysilane; the stabilizer is selected from any one of fatty alcohol polyoxyethylene ether perepin O series and fatty alcohol polyoxyethylene ether AEO series; the anti-sticking agent is selected from any one of 4,5-epoxycyclohexane-1,2-dicarboxylic acid diglycidyl ester, ethylene glycol diglycidyl ester, and pentaerythritol tetraglycidyl ether.

[0069] The first PET substrate film release agent coating device 300 and the second PET substrate film release agent coating device 400 of the parallel production line are arranged on both sides of the lithium tape unwinding device 410; the lithium tape unwound from the lithium tape unwinding device 410 and the two PET substrate films on both sides respectively transmitted from the first drying device 303 and the second drying device 403 enter the roller synchronous rolling mechanism of the lithium tape rolling device 420 synchronously, and the lithium tapes are respectively bonded to the strong release force areas 101 of the two PET substrate films.

[0070] Specifically, the two PET substrate films coated with the strong release force area 101 are transferred relative to each other and enter the roller synchronous rolling mechanism synchronously with the lithium tape, and the lithium tape is respectively attached to the strong release force area 101 of the two PET substrate films to produce lithium-PET substrate films.

[0071] A first tension control device 304 and a first deviation correcting device 305 are arranged between the first PET substrate film release agent coating device 300 and the lithium strip rolling device 420, and a second tension control device 404 and a second deviation correcting device 405 are arranged between the second PET substrate film release agent coating device 400 and the lithium strip rolling device 420; wherein, each tension control device is arranged downstream of the corresponding drying device, and each deviation correcting device is arranged between each corresponding tension control device and the lithium strip rolling device 420; the two PET substrate films transmitted from the parallel relative deviation correcting devices and the lithium strip unwound by the lithium strip unwinding device 410 synchronously enter the double-roll synchronous rolling mechanism of the lithium strip rolling device 420; then, two relative lithium-PET substrate films are synchronously transmitted from the double-roll synchronous rolling mechanism, wherein the side of the PET substrate film that is in contact with the lithium strip is transmitted relative to each other.

[0072] It should be noted that the tension control device can automatically control the tension of the processed material at any time according to process requirements to ensure stable material processing and product quality. In this embodiment, the tension control range is 1N-100N, with an accuracy of 0.1N. The correction device ensures the correct position and processing accuracy of the processed material by correcting material deviation. In this embodiment, the correction device is an ultrasonic sensor or a laser sensor, and its correction accuracy is 0.5mm. In other embodiments of the utility model, the tension control accuracy and correction accuracy can be reasonably adjusted according to actual needs.

[0073] The lithium strip unwinding device 410 in this embodiment also includes a tension control device and a correction device, wherein the unwinding shaft of the lithium strip unwinding device 410 is connected to a motor that provides power; wherein the tension control range of the tension control device is 1N-50N, and the accuracy is 0.1N; the correction device is an ultrasonic sensing device or a laser sensing device, and its correction accuracy is 0.5mm.

[0074] The current collecting composite device 500 is arranged downstream of the lithium strip rolling device 420, which includes a first copper strip unwinding device 501, a first intermittent Li-PET & copper strip composite rolling device 503, a second copper strip unwinding device 510 and a second intermittent Li-PET & copper strip composite rolling device 512; wherein the first intermittent Li-PET & copper strip composite rolling device 503 and the second intermittent Li-PET & copper strip composite rolling device 512 respectively include a pair of roller synchronous rolling mechanisms; and the first copper strip unwinding device 501 and the second copper strip unwinding device 510 are arranged on the lithium-PET base synchronously transmitted by the pair of roller synchronous rolling mechanisms. The inner side of the material film; the copper strip unwound by the first copper strip unwinding device 501 and the copper strip unwound by the second copper strip unwinding device 510 are respectively transmitted synchronously with the two parallel and opposite lithium-PET substrate films by the roller synchronous rolling mechanism of the lithium strip rolling device 420 and synchronously enter the first intermittent Li-PET & copper strip composite rolling device 503 and the second intermittent Li-PET & copper strip composite rolling device 512, and the copper strip is composited on one side of the lithium-PET substrate film, thereby producing a first single-sided intermittent composite lithium strip and a second single-sided intermittent composite lithium strip, that is, two single-sided intermittent composite lithium strips can be rolled at the same time, thereby improving the processing efficiency.

[0075] The second intermittent Li-PET & copper strip composite rolling device 512 is equipped with a third tension control device 502, and its downstream is also equipped with a first PET base film winding device 504, a first intermittent lithium-copper composite strip winding device 506 and a first slitting device 505; the third intermittent Li-PET & copper strip composite rolling device 602 is equipped with a fourth tension control device 511, and its downstream is also equipped with a second PET base film winding device 513, a second intermittent lithium-copper composite strip winding device 515 and a second slitting device 514; wherein, the first slitting device 505 is arranged on the inner side of the first PET base film winding device 504 and the second intermittent lithium-copper composite strip winding device 515, and the first slitting device 505 is provided with a slitting port for separating the intermittent lithium-copper composite strip and the PET base film; the setting of the second slitting device 514 is the same as that of the first slitting device 505.

[0076] The fixed slitting port, primarily the slitting line, effectively separates the lithium-copper composite strip from the synchronized roller rolling mechanism in the intermittent Li-PET & copper strip composite rolling unit if any adhesion occurs. The slitting line is made of anodized aluminum, tungsten carbide, steel wire, and other anti-stick materials, depending on actual needs. The diameter of the slitting line ranges from 1 to 5 mm, with the smaller the diameter, the better the separation and the less damage to the lithium-copper composite strip. The slitting line effectively avoids laser burn marks and the generation of lithium powder when cutting the lithium strip, thereby minimizing the impact on electrode performance.

[0077] The specifications of the winding guide roller in the PET substrate film winding device and the winding guide roller in the intermittent lithium-copper composite tape winding device are the same as the specifications of the unwinding guide roller in the PET substrate film unwinding device, and are provided with a motor to provide power.

[0078] It should be noted that in this embodiment, a non-powered guide roller is installed between each two devices in the single-sided intermittent lithium-copper composite strip preparation system 200. The guide roller is fixed to the equipment frame by bolts. In other embodiments of the present invention, the connection method of the guide roller can be reasonably selected according to actual needs.

[0079] In addition, the rollers in the lithium strip rolling device 420, the first intermittent Li-PET & copper strip composite rolling device 503 and the second intermittent Li-PET & copper strip composite rolling device 512 in this embodiment are all connected to the servo transmission mechanism, and the servo motor is used to provide the rotational power of the rollers; the roller gap between the rollers in the roller synchronous rolling mechanism is hydraulically controlled to control the rotation speed of the rollers, and the rotation speed range is 0.5m / min-120m / min.

[0080] Second embodiment

[0081] Please refer to Figure 3 This embodiment provides a double-sided intermittent lithium-copper composite tape preparation system 600, which includes: a first PET substrate film release agent coating device 300, a second PET substrate film release agent coating device 400, a lithium tape unwinding device 410, a lithium tape rolling device 420 and a current collector composite device 500. The only difference between it and the first embodiment is: the setting of the current collector composite device 500.

[0082] The current collector composite device 500 in this embodiment is arranged downstream of the lithium strip rolling device 420, and includes a third copper strip unwinding device 601 and a third intermittent Li-PET & copper strip composite rolling device 602; the copper strip unwinding device 601 and the two parallel and opposite lithium-PET substrate films synchronously transmitted from the roller synchronous rolling mechanism of the lithium strip rolling device 420 enter the third intermittent Li-PET & copper strip composite rolling device 602 synchronously, thereby producing a double-sided intermittent composite lithium strip.

[0083] Downstream of the third intermittent Li-PET & copper strip composite rolling device 602, a fourth tension control device 511, a third PET substrate film winding device 603, a fourth PET substrate film winding device 606, a third intermittent lithium-copper composite strip winding device 604 and a third slitting device 605 are provided to respectively wind up the PET substrate film and the double-sided intermittent composite lithium strip transmitted from the third intermittent Li-PET & copper strip composite rolling device 602.

[0084] It should be noted that the current collecting composite devices 500 in the single-sided intermittent lithium-copper composite tape preparation system 200 and the double-sided intermittent lithium-copper composite tape preparation system 600 are two parallel production lines, and the corresponding current collecting composite devices 500 are respectively arranged on racks with slide rails. The two racks can be switched and connected according to actual needs, thereby realizing the simultaneous rolling of two single-sided intermittent composite lithium tapes or the preparation of double-sided intermittent composite lithium tapes.

[0085] The PET substrate film winding device in the double-sided intermittent composite lithium tape preparation device should be arranged at intervals, not on the same vertical line, and the distance between the two should be adjustable, and the length should be equal to the strong release force area or weak release force area on the PET film; please refer to Figure 1 、 Figure 2 and Figure 3 The working principle of the intermittent lithium-copper composite strip preparation system provided by the present invention is as follows:

[0086] The first PET substrate film unwinding device 301 and the second PET substrate film unwinding device 401 unwind the PET substrate film, and sequentially pass through the first release agent coating device 302 and the second release agent coating device 402 corresponding to the downstream thereof, thereby controlling the release force of the PET substrate film 100 by controlling the silicone oil content and achieving the setting of a strong release force area 101 and a weak release force area 102 of a preset length uniformly spaced in the longitudinal direction of the PET substrate film 100 (see for details). Figure 1 ). Then it is dried in a drying device.

[0087] The lithium tape unwound from the lithium tape unwinding device 410 and the two PET substrate films on both sides respectively transmitted from the first drying device 303 and the second drying device 403 enter the roller synchronous rolling mechanism of the lithium tape rolling device 420 synchronously, and the lithium tapes are respectively bonded to the strong release force area 101 of the two PET substrate films 100 to produce lithium-PET substrate films.

[0088] If a single-sided intermittent composite lithium strip is prepared, two parallel lithium-PET substrate films are respectively and synchronously fed into the corresponding intermittent Li-PET & copper strip composite rolling device with the copper strip unwinding device corresponding to them, thereby realizing the simultaneous rolling of two single-sided intermittent composite lithium strips.

[0089] If a double-sided intermittent composite lithium strip is prepared, two parallel lithium-PET substrate films and the copper strip unwound by the copper strip unwinding device are simultaneously entered into the intermittent Li-PET & copper strip composite rolling device, thereby realizing the preparation of the double-sided intermittent composite lithium strip.

[0090] In summary, the purpose of the present invention is to provide an intermittent lithium-copper composite tape preparation system, which can effectively solve the requirements of different battery capacities on the width of the pole tab and the size of the pole piece and the problem that the pole piece cannot leave pole tabs of arbitrary width in the length direction; the preparation system can save the substrate that carries metallic lithium, without waste, and is environmentally friendly; in addition, the intermittent lithium-copper composite tape preparation system provided by the present invention realizes the simultaneous rolling of two single-sided intermittent composite lithium tapes and the preparation of double-sided intermittent composite lithium tapes, thereby improving processing efficiency.

[0091] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An intermittent lithium-copper composite tape preparation system, characterized in that: It includes: Lithium tape unwinding device; A first PET substrate film release agent coating device and a second PET substrate film release agent coating device are respectively used to form strong release force zones of a preset length evenly spaced along the length direction of the PET substrate films on two PET substrate films, and the interval length between every two adjacent strong release force zones is the preset length of the strong release force zone; A lithium ribbon rolling device, comprising a pair of roller synchronous rolling mechanisms, wherein two PET substrate films on opposite sides delivered by the first PET substrate film release agent coating device and the second PET substrate film release agent coating device synchronously enter the pair of roller synchronous rolling mechanisms, and the strong release force areas on the two PET substrate films are staggered and opposite; the lithium ribbon unwound by the lithium ribbon unwinding device and the two PET substrate films on opposite sides synchronously enter the pair of roller synchronous rolling mechanisms, and the lithium ribbon is respectively bonded to the strong release force areas of the two PET substrate films; And, a current collector composite device is used to composite the current collector with two PET substrate films bonded with lithium strips.

2. The intermittent lithium-copper composite tape preparation system according to claim 1, characterized in that: The first PET substrate film release agent coating device and the second PET substrate film release agent coating device are respectively provided with a release agent coating device; The release agent coating device includes an operation interface and a swing-arm robot. By inputting specification data of the PET substrate film, area data of the strong release force zone, and corresponding release force data into the operation interface, the swing-arm angle of the swing-arm robot and the release agent required for coating are controlled, thereby achieving the setting of the strong release force zones of preset length with uniform intervals in the longitudinal direction of the PET substrate film.

3. The intermittent lithium-copper composite tape preparation system according to claim 2, characterized in that: The release agent coating device further includes a metering roller, a transfer roller, a feeding roller, and an oil cylinder. The metering roller is connected to the oil cylinder and transfers the oil in the oil cylinder to the transfer roller. The transfer roller transfers the oil to the feeding roller. The feeding roller coats the oil on the surface of the PET substrate film, coating the strong release force areas of a preset length uniformly spaced in the longitudinal direction of the PET substrate film. A sensor for controlling the oil amount is arranged in the oil cylinder.

4. The intermittent lithium-copper composite tape preparation system according to claim 1, characterized in that: The first PET substrate film release agent coating device and the second PET substrate film release agent coating device are respectively provided with a PET substrate film unwinding device and a drying device; The PET substrate film unwinding device is arranged upstream of the release agent coating device, and the drying device is arranged downstream of the release agent coating device; The drying device includes an infrared radiator or a heating device.

5. The intermittent lithium-copper composite tape preparation system according to claim 4, characterized in that: The first PET substrate film release agent coating device and the second PET substrate film release agent coating device are further provided with a tension control device and a deviation correction device respectively; The tension control device is arranged downstream of the drying device, and the deviation correction device is arranged between the tension control device and the lithium strip rolling device; The two PET substrate films transmitted from the parallel and opposite correcting devices and the lithium ribbon unwound by the lithium ribbon unwinding device synchronously enter the roller synchronous rolling mechanism of the lithium ribbon rolling device.

6. The intermittent lithium-copper composite tape preparation system according to claim 1, characterized in that: The current collector composite device is a single-sided intermittent lithium-copper composite tape preparation device and a double-sided intermittent lithium-copper composite tape preparation device that are arranged in parallel.

7. The intermittent lithium-copper composite tape preparation system according to claim 6, characterized in that: The single-sided intermittent lithium-copper composite strip preparation device includes a first copper strip unwinding device, a first intermittent Li-PET & copper strip composite rolling device, a second copper strip unwinding device and a second intermittent Li-PET & copper strip composite rolling device, the first intermittent Li-PET & copper strip composite rolling device and the second intermittent Li-PET & copper strip composite rolling device respectively include a pair of roller synchronous rolling mechanisms; Among them, the copper strip unwound by the first copper strip unwinding device and the copper strip unwound by the second copper strip unwinding device respectively enter the first intermittent Li-PET & copper strip composite rolling device and the second intermittent Li-PET & copper strip composite rolling device synchronously with the two PET substrate films with lithium strips on both sides transmitted by the lithium strip rolling device, and the copper strips are composited at the PET substrate films with lithium strips.

8. The intermittent lithium-copper composite tape preparation system according to claim 6, characterized in that: The double-sided intermittent composite lithium strip preparation device includes a third copper strip unwinding device and a third intermittent Li-PET & copper strip composite rolling device; The two PET substrate films with lithium tape bonded on both sides transmitted by the lithium tape rolling device respectively enter the third intermittent Li-PET & copper tape composite rolling device from both sides of the third copper tape unwinding device synchronously with the copper tape unwinded by the third copper tape unwinding device, and the copper tape is composited at the PET substrate film with lithium tape bonded.

9. The intermittent lithium-copper composite tape preparation system according to any one of claims 7-8, characterized in that: The downstream of each intermittent Li-PET & copper strip composite rolling device is also equipped with a PET substrate film winding device, an intermittent lithium-copper composite strip winding device and a slitting device; The slitting device is provided with a slitting port for separating the intermittent lithium-copper composite tape and the PET substrate film.

10. The intermittent lithium-copper composite tape preparation system according to claim 1, characterized in that: The intermittent lithium-copper composite tape preparation system includes a lithium tape unwinding device, a PET substrate film unwinding device, first to third copper tape unwinding devices, a PET substrate film winding device, and an intermittent lithium-copper composite tape winding device, all of which are equipped with a power supply device; The intermittent lithium-copper composite strip preparation system further includes a plurality of guide rollers that do not provide power.

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