Pole piece processing apparatus, processing method, and battery

Abstract

The application discloses a kind of pole piece processing equipment, processing method and battery, belong to battery manufacturing technical field.Pole piece processing equipment includes: feeding device, film forming roller group, thinning roller group, unwinding device, composite roller group and winding device;Feeding device includes at least two feeding modules, feeding module is arranged above film forming roller group with interval, feeding module respectively feeds film forming roller group, and film forming roller group outputs first continuous film piece;Thinning roller group is located downstream of film forming roller group, for forming second continuous film piece by rolling first continuous film piece;Unwinding device, composite roller group and winding device are respectively located downstream of thinning roller group, unwinding device is used to supply foil, composite roller group is used to form pole piece by rolling and covering second continuous film piece and foil, and winding device is used to wind pole piece.The pole piece processing equipment of the application can process ultra-thin pole piece with thickness less than 60 microns.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and in particular to an electrode processing equipment, processing method and battery. Background Technology

[0002] Dry electrode production technology, as a solvent-free electrode manufacturing technology, has potential advantages such as environmental friendliness, low cost, and high energy density.

[0003] However, the dry electrode process in related technologies can generally produce electrode thicknesses of 60 micrometers to 1 millimeter. When processing ultra-thin electrode sheets with a thickness of less than 60 micrometers, the film will break, making it impossible to process ultra-thin electrode sheets. Summary of the Invention

[0004] This application provides an electrode processing equipment, processing method, and battery, which can solve the problem that the dry electrode process of related technologies cannot process ultra-thin electrodes with a thickness of less than 60 micrometers.

[0005] The technical solution is as follows: On the one hand, an electrode processing device is provided, including: a feeding device, a film forming roller group, a thinning roller group, an unwinding device, a composite roller group, and a winding device; The feeding device includes at least two feeding modules, which are arranged at intervals above the film-forming roller group. The feeding modules feed the film-forming roller group respectively, and the film-forming roller group outputs a first continuous film sheet. The thinning roller group is located downstream of the film forming roller group and is used to roll the first continuous film sheet to form a second continuous film sheet. The unwinding device, the composite roller group, and the winding device are located downstream of the thinning roller group. The unwinding device is used to supply foil material, the composite roller group is used to roll-press and laminate the second continuous film with the foil material to form an electrode sheet, and the winding device is used to wind up the electrode sheet.

[0006] In some embodiments, the film-forming roller assembly includes at least four film-forming pressure rollers; The at least four film-forming rollers are arranged in parallel and spaced apart, and each of the feeding modules is located above two adjacent film-forming rollers.

[0007] In some embodiments, the film-forming roller includes a first roller, a second roller, a third roller, and a fourth roller; The feeding module includes a first feeding module and a second feeding module; The first feeding module is located between the first pressure roller and the second pressure roller. The first feeding module feeds the first dry powder into the first roller gap between the first pressure roller and the second pressure roller, and the first pressure roller and the second pressure roller roll it to form a first film. The first diaphragm enters the second roll gap between the third and fourth pressure rollers; The second feeding module is located between the third and fourth pressure rollers. The second feeding module feeds the second dry powder into the second roller gap, and the third and fourth pressure rollers roll the first film and the second dry powder to form the first continuous film.

[0008] In some embodiments, the first dry-process and the second dry-process powders have the same composition.

[0009] In some embodiments, the number of the thinning roller groups is at least two; Each of the two film-forming rollers corresponding to the feeding module is provided with a thinning roller group downstream.

[0010] In some embodiments, the thickness of the second continuous membrane ranges from 10 to 60 micrometers.

[0011] In some embodiments, the number of feeding devices is two, namely a first feeding device and a second feeding device; The number of film-forming roller groups is two, namely the first film-forming roller group and the second film-forming roller group; The number of the thinning roller groups is two, namely the first thinning roller group and the second thinning roller group; The first feeding device, the first film forming roller group and the first thinning roller group are located sequentially on one side of the composite roller group, and are used to feed the second continuous film A into the composite roller group; The second feeding device, the second film forming roller group and the second thinning roller group are located sequentially on the other side of the composite roller group, and are used to input the second continuous film B into the composite roller group; The composite roller assembly is used to roll and laminate the second continuous film A and the second continuous film B onto the opposite sides of the foil to form a double-sided electrode.

[0012] In some embodiments, the foil is a current collector material or an electrolyte membrane substrate.

[0013] On the other hand, a method for processing electrode sheets is provided, employing the processing equipment described in this application, the processing method comprising: At least two of the feeding devices feed the film-forming roller group respectively, and the film-forming roller group rolls multiple batches of powder sequentially to form the first continuous film; The thinning roller assembly applies thinning roller pressure to the first continuous film to form the second continuous film; The unwinding device supplies the foil, and the foil and the second continuous film are stacked and fed into the composite roller group, where they are rolled together to form the electrode sheet. The winding device winds up the electrode sheet into a roll.

[0014] On the other hand, a battery is provided, which is a liquid battery or an all-solid-state battery; the battery includes a positive electrode and a negative electrode. At least one of the positive electrode sheet and the negative electrode sheet is formed by processing with the processing equipment described in this application, or by processing with the processing method described in this application.

[0015] The beneficial effects of the technical solution provided in this application include at least the following: The electrode processing equipment of this application includes at least two feeding modules spaced apart above the film-forming roller assembly. These two modules feed material to the film-forming roller assembly, which then rolls the powder from different feeding modules to form a first continuous film. Because the at least two feeding modules are spaced apart along the material conveying direction of the film-forming roller assembly, different batches of powder are sequentially rolled at the assembly. The first batch of powder is rolled to form an initial film, and subsequent batches are rolled and stacked on top of this initial film. The rolling process is decomposed into multiple stages, each with a relatively small thinning ratio. Therefore, even if the final thickness of the second continuous film is as low as 10-60 micrometers and the total thinning ratio is large, the deformation of each rolling stage is within the tolerance range of the film material, making the formed second continuous film less prone to breakage.

[0016] In this process, the initial diaphragm acts as a supporting framework during subsequent rolling. The dry powder is pressed into the surface or internal pores of the initial diaphragm, which then constrains and protects it. The initial diaphragm can be thicker than the target thickness of the final second continuous diaphragm, thus possessing sufficient self-support during its formation and being less prone to breakage. After the first continuous diaphragm is formed, it is gradually thinned to the target thickness by a thinning roller assembly. During this thinning process, there is a conveying and relaxation process, releasing internal stress. Therefore, even if the thickness of the second continuous diaphragm is as low as 10-60 micrometers, it is not prone to breakage, allowing for the processing of ultra-thin electrode sheets with a thickness of less than 60 micrometers. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the electrode processing equipment provided in the embodiments of this application; Figure 2This is a schematic diagram of the feeding device and film-forming roller assembly provided in the embodiments of this application; Figure 3 This is a schematic diagram of the structure of an electrode processing device provided in another embodiment of this application; Figure 4 This is a schematic diagram of the structure of an electrode processing device provided in another embodiment of this application; Figure 5 This is a schematic diagram of the structure of the single-sided electrode provided in the embodiments of this application; Figure 6 This is a schematic diagram of the structure of the double-sided electrode provided in the embodiments of this application; Figure 7 This is a schematic diagram of the structure of an electrode sheet provided in another embodiment of this application; Figure 8 This is a schematic diagram of the structure of an electrode sheet provided in another embodiment of this application; Figure 9 This is a schematic flowchart of the electrode processing method provided in the embodiments of this application.

[0019] The reference numerals in the figure are respectively: 100, First continuous membrane; 1001, First membrane; 200, Second continuous membrane; 2001, Second continuous membrane A; 2002, Second continuous membrane B; 300, Foil; 400, Electrode; 500, Double-sided electrode; 600, Electrolyte membrane; 1. Feeding device; 101. First feeding device; 102. Second feeding device; 11. Feeding module; 111. First feeding module; 112. Second feeding module; 2. Film-forming roller assembly; 201. First film-forming roller group; 202. Second film-forming roller group; 21. Film-forming pressure roller; 211. First pressure roller; 212. Second pressure roller; 213. Third pressure roller; 214. Fourth pressure roller; 215. First roller gap; 216. Second roller gap; 3. Thinning roller assembly; 301. First thinning roller group; 302. Second thinning roller group; 4. Unwinding device; 5. Composite roller assembly; 6. Winding device. Detailed Implementation

[0020] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0021] In the description of this application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the appendix. Figure 1 The orientations or positional relationships shown are for the purpose of facilitating and simplifying the description of this application, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0022] Unless otherwise defined, all technical terms used in the embodiments of this application have the same meaning as commonly understood by one of ordinary skill in the art.

[0023] In related technologies, dry electrode processes typically employ a single-feed, single-roll forming method, where a single batch of powder is directly rolled into a film of the target thickness using a pair of rollers. The initial packing thickness of the loose powder is usually 500-1000 micrometers. When the target film thickness is above 60 micrometers, the thinning ratio is approximately 5-15 times, and the film can still maintain its integrity. However, when the target film thickness is below 60 micrometers, the thinning ratio increases to 15-25 times or even higher, leading to the following problems: (1) The greater the thinning ratio, the greater the deformation of a single roll pressing, the less the powder particles are rearranged during the rapid large deformation process, and the insufficient bonding force between the particles. (2) The greater the thinning ratio, the greater the strain gradient in the thickness direction of the powder layer, which makes it easier to generate shear cracks. Moreover, the thinner the film, the easier it is for cracks to penetrate the entire thickness and cause rupture. (3) The greater the thinning ratio, the higher the degree of gas compression in the pores of the powder, which is more likely to form a local high pressure zone that opens up the particles and forms pore defects. Moreover, the thinner the membrane, the greater the impact of pore defects on the integrity of the membrane. (4) The thinner the diaphragm, the worse its self-supporting ability. During the conveying process after leaving the roller gap, it is easily broken when the internal residual stress is released due to the influence of external forces such as guide roller, tension, and gravity.

[0024] Therefore, the thickness of dry-process electrode sheets in related technologies is generally between 60 micrometers and 1 millimeter, making it difficult to process ultra-thin electrode sheets with a thickness of less than 60 micrometers.

[0025] This application provides an electrode processing device in which the diaphragm can be formed by multiple feedings and batch rolling, which not only achieves a lower thickness but also has the property of being less prone to breakage.

[0026] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0027] On the one hand, combined with Figure 1 As shown, this embodiment provides an electrode processing device, including: a feeding device 1, a film forming roller group 2, a thinning roller group 3, an unwinding device 4, a composite roller group 5, and a winding device 6.

[0028] The feeding device 1 includes at least two feeding modules 11, which are arranged at intervals above the film forming roller group 2. The feeding modules 11 feed the film forming roller group 2 respectively, and the film forming roller group 2 outputs the first continuous film 100.

[0029] The thinning roller group 3 is located downstream of the film forming roller group 2 and is used to roll the first continuous film 100 to form the second continuous film 200.

[0030] The unwinding device 4, the composite roller group 5, and the winding device 6 are located downstream of the thinning roller group 3. The unwinding device 4 is used to supply foil 300, the composite roller group 5 is used to roll and laminate the second continuous film 200 with the foil 300 to form an electrode 400, and the winding device 6 is used to wind up the electrode 400.

[0031] The electrode processing equipment provided in this embodiment has at least two feeding modules 11 arranged at intervals above the film-forming roller group 2. The at least two feeding modules 11 feed materials to the film-forming roller group 2 respectively, and the film-forming roller group 2 rolls the powder from different feeding modules 11 to form a first continuous film 100. Since the at least two feeding modules 11 are arranged at intervals along the material conveying direction of the film-forming roller group 2, different batches of powder are rolled sequentially at the film-forming roller group 2. The powder fed first is rolled to form an initial film, and the powder fed later is rolled and stacked on the basis of the initial film. The rolling process of the powder is decomposed into multiple stages, and the thinning ratio of each stage is relatively small. Therefore, even if the thickness of the final second continuous film 200 is as low as 10-60 micrometers and the total thinning ratio is large, the deformation of each rolling stage is within the tolerance range of the film material, and the formed second continuous film 200 is not easy to break.

[0032] In this process, the initial diaphragm acts as a supporting framework during subsequent rolling. The dry powder is pressed into the surface or internal pores of the initial diaphragm, which then constrains and protects it. The initial diaphragm's thickness can be greater than the target thickness of the final second continuous diaphragm 200, thus providing sufficient self-support during its formation and preventing breakage. After the first continuous diaphragm 100 is formed, it is gradually thinned to the target thickness by the thinning roller group 3. During this thinning process, there is a conveying and relaxation process, releasing internal stress. Therefore, even if the thickness of the second continuous diaphragm 200 is as low as 10-60 micrometers, it is not prone to breakage, allowing for the processing of ultra-thin electrode sheets with a thickness of less than 60 micrometers.

[0033] In some possible implementations, the feeding device 1 may be a screw feeder, a vibrating feeder, a gravity feeder, or a loss-in-weight scale. The discharge port of the feeding module 11 may be equipped with a scraper or a distribution roller to ensure that the powder falls evenly into the gap between the film-forming rollers 2.

[0034] In some possible implementations, the number of feeding modules 11 can be set according to the target thickness of the second continuous film 200. When the target thickness of the second continuous film 200 is thin, the number of feeding modules 11 can be increased to reduce the amount of powder fed per batch, so that the film forming roller group 2 can roll the powder more fully and the internal stress of the film is smaller.

[0035] In some possible implementations, the spacing between the feeding modules 11 can be adjusted according to the characteristics of the powder. When the powder has good flowability, the spacing can be appropriately reduced, for example, the two feeding modules 11 are separated by one roller gap; when the powder has poor flowability, the spacing can be appropriately increased, for example, the two feeding modules 11 are separated by two roller gaps, so that the powder in front has sufficient dispersion space after falling into the roller gap, and then the powder continues to be fed, avoiding the accumulation of powder that leads to local stress concentration.

[0036] In some possible implementations, a guide roller may be provided between the film-forming roller group 2 and the thinning roller group 3 to guide the first continuous film 100 from the film-forming roller group 2 to the thinning roller group 3. Exemplarily, the number and position of the guide rollers may be set according to the path of the first continuous film 100, so that the first continuous film 100 remains taut during transport, avoiding slack or wrinkles that could damage the film.

[0037] In some possible implementations, a detection device can be installed between the composite roller group 5 and the winding device 6 to detect the quality of the electrode sheet 400. The detection device can be one or more of a thickness gauge, areal density gauge, or defect detector, used to monitor in real time whether the electrode sheet 400 has defects such as cracks or delamination.

[0038] In some possible implementations, electrode processing equipment can process electrodes into shapes such as Figure 5The single-sided electrode shown is 400. Figure 5 The single-sided electrode 400 shown is composited with a first continuous film 100 formed by dry powder fed by the feeding device 1 on one side of the foil 300.

[0039] In some possible implementations, the electrode processing equipment can process and form an electrolyte membrane. In this case, the electrolyte powder fed into the feeding device 1 forms a first continuous membrane 100, which is then laminated onto one side of the foil 300. The material of the foil 300 is compatible with the electrolyte powder, and this application does not limit this specific application.

[0040] In some other possible implementations, electrode processing equipment can process electrodes into shapes such as Figure 7 The composite electrode shown. Figure 7 The composite electrode shown has a first continuous film 100 formed from dry powder fed by an upstream feeding device 1, and an electrolyte film 600 formed from electrolyte powder fed by a downstream feeding device 1. The electrolyte film 600 is stacked on the first continuous film 100 to form a composite film. The composite film is then rolled onto a foil 300, with the first continuous film 100, which serves as the positive or negative electrode material, located on the inner side, and the electrolyte film 600 located on the outer side. This type of composite electrode combines positive and negative electrodes and an electrolyte film, and can be applied to all-solid-state batteries.

[0041] Combination Figure 2 As shown, in some embodiments, the film-forming roller group 2 includes at least four film-forming pressure rollers 21; the at least four film-forming pressure rollers 21 are arranged in parallel at intervals, and each feeding module 11 is located above two adjacent film-forming pressure rollers 21.

[0042] With the above arrangement, at least four film-forming rollers 21 are arranged in parallel and spaced apart, forming a roller gap between two adjacent film-forming rollers 21. Each feeding module 11 corresponds to one roller gap, into which powder is fed, and the two film-forming rollers 21 forming the roller gap roll the powder. Multiple roller gaps are arranged sequentially along the material conveying direction. The powder is rolled into an initial film at the first roller gap, and the initial film is conveyed to the second roller gap, where it is rolled together with the second batch of powder. Therefore, the first continuous film 100 formed undergoes multiple stages of rolling, with a small strain at each stage of rolling. The internal stress of the film is gradually released, making it less prone to breakage due to stress concentration.

[0043] In some possible implementations, the film-forming rollers 21 can be arranged in a straight line or an arc. When the film-forming rollers 21 are arranged in a straight line, the material conveying path is straight, and the equipment layout is compact. When the film-forming rollers 21 are arranged in an arc, the material conveying path is arc, which facilitates connection with other devices, and the film can relax naturally during the arc-shaped conveying process, which is beneficial for releasing internal stress.

[0044] In some possible implementations, the film-forming roller 21 can be driven by either a single side or both sides. In single-side drive, one film-forming roller 21 is driven by a motor, while the other is driven by friction. In double-side drive, both film-forming rollers 21 are driven by separate motors, resulting in better roller synchronization and preventing the film from cracking due to tensile stress caused by inconsistent linear speeds between the two rollers.

[0045] In some possible implementations, the gap between adjacent film-forming rollers 21 can be adjusted independently. A gap adjustment mechanism can be provided at each roller gap to adjust the size of the gap, thereby controlling the degree of roller pressure at that gap. By independently adjusting the gap of each roller gap, the thinning amount of the film at each roller gap can be reasonably distributed, avoiding excessive roller pressure at any one level that could lead to film breakage.

[0046] Combination Figure 2 As shown, in some embodiments, the film-forming roller 21 includes a first roller 211, a second roller 212, a third roller 213, and a fourth roller 214. The feeding module 11 includes a first feeding module 111 and a second feeding module 112.

[0047] The first feeding module 111 is located between the first pressure roller 211 and the second pressure roller 212. The first feeding module 111 feeds the first dry powder into the first roller gap 215 between the first pressure roller 211 and the second pressure roller 212, where it is rolled by the first pressure roller 211 and the second pressure roller 212 to form a first diaphragm 1001. The first diaphragm 1001 enters the second roller gap 216 between the third pressure roller 213 and the fourth pressure roller 214.

[0048] The second feeding module 112 is located between the third pressure roller 213 and the fourth pressure roller 214. The second feeding module 112 feeds the second dry powder into the second roller gap 216, and the third pressure roller 213 and the fourth pressure roller 214 roll the first film 1001 and the second dry powder to form the first continuous film 100.

[0049] In this embodiment, the first feeding module 111 is located between the first pressure roller 211 and the second pressure roller 212. The first feeding module 111 feeds the first dry powder into the first roller gap 215 between the first pressure roller 211 and the second pressure roller 212. The first dry powder is squeezed by the first pressure roller 211 and the second pressure roller 212 at the first roller gap 215. The powder particles are close to each other and compacted, thus forming a first membrane 1001 with self-supporting ability, which can be output from the first roller gap 215 and conveyed to the second roller gap 216.

[0050] The second feeding module 112 is located between the third pressure roller 213 and the fourth pressure roller 214. It feeds the second dry powder into the second roller gap 216. The first diaphragm 1001 serves as a supporting skeleton at the second roller gap 216. After the second dry powder is fed into the second roller gap 216, it is laid on the surface of the first diaphragm 1001. The third pressure roller 213 and the fourth pressure roller 214 simultaneously roll the first diaphragm 1001 and the second dry powder. The second dry powder is pressed into the surface or internal pores of the first diaphragm 1001. The first diaphragm 1001 plays a supporting and protective role. Therefore, the internal structure of the first continuous diaphragm 100 is dense. There is no obvious interface between the first diaphragm 1001 and the second dry powder, making it difficult to delaminate. Moreover, the first continuous diaphragm 100 is supported by the first diaphragm 1001 as a skeleton during the formation process, making it less prone to breakage.

[0051] In some possible implementations, the structures of the first feeding module 111 and the second feeding module 112 may be the same or different. When the structures of the first feeding module 111 and the second feeding module 112 are the same, the feeding characteristics of the first dry powder and the second dry powder are consistent, and the equipment is easy to maintain. When the structures of the first feeding module 111 and the second feeding module 112 are different, they can be optimized according to the characteristics of the first dry powder and the second dry powder, such as the first feeding module 111 using a screw feeder and the second feeding module 112 using a vibrating feeder.

[0052] In some possible implementations, the diameters of the first pressure roller 211, the second pressure roller 212, the third pressure roller 213, and the fourth pressure roller 214 can be the same or different. When the diameters are the same, the pressure rollers can be interchanged, facilitating spare parts management. When the diameters are different, the rollers can be optimized according to their functions. For example, the first pressure roller 211 and the second pressure roller 212 can have larger diameters, forming a larger first roller gap 215, which facilitates the feeding of the first dry powder and the formation of a thicker first film 1001; the third pressure roller 213 and the fourth pressure roller 214 can have smaller diameters, forming a smaller second roller gap 216, which facilitates fine rolling of the first film 1001 and the second dry powder.

[0053] In some possible implementations, a first scraper may be provided between the first pressure roller 211 and the second pressure roller 212 to scrape the first dry powder output from the first feeding module 111 into the first roller gap 215. A second scraper may be provided between the third pressure roller 213 and the fourth pressure roller 214 to scrape the second dry powder output from the second feeding module 112 into the second roller gap 216. The scraper can ensure uniform distribution of the powder and prevent powder accumulation from causing local stress concentration and diaphragm rupture.

[0054] In some embodiments, the first dry-process and the second dry-process powders have the same composition. Here, "same composition" means that the types and weight proportions of active substances, conductive agents, binders, and other components in the first and second dry-process powders are the same.

[0055] In this embodiment, the first dry powder and the second dry powder have the same composition, and the first film 1001 and the second dry powder are made of the same material. During rolling at the second roll gap 216, the first film 1001 and the second dry powder have good compatibility and are easy to fuse. The composition of each position inside the formed first continuous film 100 is consistent, thus resulting in uniform electrochemical performance. At the same time, due to the consistent material, the deformation characteristics of the first film 1001 and the second dry powder are consistent during the rolling process, making it less prone to delamination or cracking due to interfacial stress concentration caused by deformation incoordination.

[0056] In some possible implementations, the first dry powder and the second dry powder can be supplied from the same powder silo, with the output end of the powder silo connected to the first feeding module 111 and the second feeding module 112 respectively via a distribution pipe. Using the same powder silo ensures that the composition of the first dry powder and the second dry powder is consistent, and eliminates the need for multiple powder silos, thus simplifying the equipment structure.

[0057] In other possible implementations, the first and second dry powders can also be supplied from different powder silos. When it is necessary to prepare a gradient functional membrane, powders with different compositions can be loaded into different powder silos. For example, the first powder silo can be loaded with powders with a higher binder content, and the second powder silo can be loaded with powders with a higher active substance content. The resulting first continuous membrane 100 has a gradient distribution of composition in the thickness direction. The side of the membrane with a higher binder content has better membrane strength and can play a protective role in subsequent thinning and lamination processes, reducing the risk of membrane breakage.

[0058] Combination Figure 3 As shown, in some embodiments, the number of thinning roller groups 3 is at least two; a thinning roller group 3 is provided downstream of each of the two film-forming rollers 21 corresponding to each feeding module 11.

[0059] With the above arrangement, the two film-forming rollers 21 corresponding to each feeding module 11 form a roller gap, and the film output from this roller gap is thinned at the thinning roller group 3 downstream of the roller gap. The first roller 211 and the second roller 212 corresponding to the first feeding module 11 form a first roller gap 215. The first film 1001 output from the first roller gap 215 is thinned at the thinning roller group 3 downstream of the first roller gap 215. The thinned first film 1001 then enters the second roller gap 216 and is rolled together with the second dry powder. The third roller 213 and the fourth roller 214 corresponding to the second feeding module 11 form a second roller gap 216. The first continuous film 100 output from the second roller gap 216 is thinned at the thinning roller group 3 downstream of the second roller gap 216 to form a second continuous film 200.

[0060] The first diaphragm 1001 is thinned before entering the second roll gap 216. With reduced thickness, when the first diaphragm 1001 is rolled against the second dry powder at the second roll gap 216, the obstruction effect of the first diaphragm 1001 on the second dry powder is reduced, making it easier for the second dry powder to be pressed into the first diaphragm 1001. The first continuous diaphragm 100 is thinned before output, improving thickness accuracy. Furthermore, since there are at least two thinning roller groups 3, the first continuous diaphragm 100 is thinned in stages to form the second continuous diaphragm 200. Each thinning step involves a small amount of material, and the diaphragm undergoes a conveying and relaxation process between thinning steps, releasing internal stress. Therefore, even if the thickness of the second continuous diaphragm 200 is as low as 10-60 micrometers, it is less prone to tensile breakage during the thinning process.

[0061] In some possible implementations, a guide roller can be provided between the thinning roller group 3 and the corresponding film-forming roller 21 to guide the film from the film-forming roller 21 to the thinning roller group 3. The position of the guide roller can be set according to the path of the film to maintain appropriate tension on the film during the conveying process, avoiding excessive tension that would cause the film to stretch and break, or insufficient tension that would cause the film to loosen and wrinkle.

[0062] In some possible implementations, the surface of the thinning roller assembly 3 can be textured, such as with a frosted finish or a mesh pattern. When the surface of the thinning roller assembly 3 is textured, the corresponding texture forms on the surface of the film during the thinning process, which can increase the contact area between the film and the foil 300 during lamination and improve the interfacial adhesion. At the same time, the texture can reduce the contact area between the thinning roller assembly 3 and the film, reduce friction, and lower the risk of the film being damaged during the thinning process.

[0063] In some possible implementations, the thinning roller group 3 can be equipped with a floating support structure, so that the thinning roller group 3 can adaptively adjust its position according to the thickness fluctuation of the film, avoiding damage to the film or causing the film to break when the film thickness changes abruptly.

[0064] In some embodiments, the thickness of the second continuous membrane 200 ranges from 10 to 60 micrometers.

[0065] With the above setup, the combination of at least two feeding modules 11 feeding material in sequence, multi-stage rolling of film forming roller group 2, and graded thinning of thinning roller group 3, the film gradually becomes denser during the formation process. The strain of each rolling and thinning is within the tolerance range of the film material. Therefore, it is possible to stably generate an ultra-thin second continuous film 200 with a thickness of 10-60 micrometers, and the film has good integrity and is not easy to break.

[0066] The second continuous diaphragm 200 has a thickness of 10-60 micrometers, which has better strength and flexibility and can remain intact during transportation. At the same time, it has good interfacial bonding when combined with foil 300. The electrode 400 and battery formed by using the second continuous diaphragm 200 have significant advantages in terms of energy density, rate performance, cycle life and fast charging performance.

[0067] Combination Figure 4 As shown, in some embodiments, there are two feeding devices 1, namely a first feeding device 101 and a second feeding device 102; there are two film forming roller groups 2, namely a first film forming roller group 201 and a second film forming roller group 202.

[0068] There are two thinning roller groups 3, namely the first thinning roller group 301 and the second thinning roller group 302; the first feeding device 101, the first film forming roller group 201 and the first thinning roller group 301 are located on one side of the composite roller group 5, and are used to feed the second continuous film A2001 into the composite roller group 5; the second feeding device 102, the second film forming roller group 202 and the second thinning roller group 302 are located on the other side of the composite roller group 5, and are used to feed the second continuous film B2002 into the composite roller group 5; the composite roller group 5 is used to roll and laminate the second continuous film A2001 and the second continuous film B2002 onto the opposite sides of the foil 300 to form a double-sided electrode 500.

[0069] In this embodiment, the first feeding device 101, the first film forming roller group 201 and the first thinning roller group 301 form a first film preparation unit for preparing a second continuous film A2001, and the second feeding device 102, the second film forming roller group 202 and the second thinning roller group 302 form a second film preparation unit for preparing a second continuous film B2002.

[0070] The first and second film preparation units are located on opposite sides of the composite roller group 5, respectively. The second continuous film A2001 is input from one side of the composite roller group 5, and the second continuous film B2002 is input from the other side. The foil 300 passes through the middle of the composite roller group 5. The second continuous film A2001 and the second continuous film B2002 are simultaneously rolled and laminated with the opposite sides of the foil 300 at the composite roller group 5. Therefore, the double-sided electrode 500 is formed in a single lamination process, eliminating the need to laminate one side first, then flip it over, and then laminate the other side, simplifying the production process and improving production efficiency.

[0071] Furthermore, the second continuous film A2001 and the second continuous film B2002 are simultaneously laminated with the foil 300 at the composite roller group 5. The composite roller group 5 applies the same pressure to the second continuous film A2001 and the second continuous film B2002. Therefore, the thickness, density, and other parameters of the films on both sides of the double-sided electrode 500 are highly consistent, which is beneficial to improving the consistency of the batteries prepared using this double-sided electrode 500. At the same time, since the second continuous film A2001 and the second continuous film B2002 are laminated simultaneously, the forces on both sides of the foil 300 are balanced, which can avoid deformation or film breakage caused by uneven forces on the foil 300 when laminated on one side.

[0072] In some possible implementations, electrode processing equipment can process electrodes into shapes such as Figure 6 The double-sided electrode 500 is shown. Figure 6 The double-sided electrode 500 shown has a second continuous membrane A2001 and a second continuous membrane B2002 formed by dry powder fed by two feeding devices 1, which are respectively laminated on both sides of the foil 300. The second continuous membrane A2001 and the second continuous membrane B2002 can be electrode additives or electrolyte additives.

[0073] In some other possible implementations, electrode processing equipment can also process materials such as... Figure 8 The double-sided composite electrode shown.

[0074] For example, Figure 8 The illustrated double-sided composite electrode has two composite films on both sides of the foil 300: the second continuous film A2001 and the second continuous film B2002. That is, the first continuous film 100, serving as the positive or negative electrode material, is located on the inner side, and the electrolyte film 600 is located on the outer side. In some other possible implementations, the electrode processing equipment can also process another type of double-sided composite electrode, in which one of the second continuous film A2001 and the second continuous film B2002 is a single positive electrode film or a single negative electrode film, and the other is a composite film. For example, the second continuous film A2001 is a single positive electrode film, and the second continuous film B2002 is a composite film (formed by combining a negative electrode film and an electrolyte film), or the second continuous film A2001 is a composite film (formed by combining a positive electrode film and an electrolyte film), and the second continuous film B2002 is a single negative electrode film.

[0075] In some possible implementations, the structures of the first membrane fabrication unit and the second membrane fabrication unit can be arranged symmetrically or asymmetrically, which can respectively meet the fabrication requirements of the symmetrical double-sided electrode 500 and the asymmetrical double-sided electrode 500.

[0076] In some possible implementations, the composite roller assembly 5 may be equipped with a double-sided pressure adjustment mechanism for independently adjusting the composite pressure of the composite roller assembly 5 on the second continuous diaphragm A2001 and the second continuous diaphragm B2002. When the bonding force of the two diaphragms needs to be consistent, the composite pressure on both sides is set to be the same. When the bonding force of the two diaphragms needs to be different, the composite pressure on both sides can be set independently.

[0077] Combination Figures 5 to 7 As shown, in some embodiments, the foil 300 is a current collector material or an electrolyte membrane substrate.

[0078] When the foil 300 is a current collector material, it is conductive. The second continuous film 200 is combined with the current collector material to form an electrode 400, which can be directly used in liquid or solid-state battery assembly. Since the current collector material serves as the substrate for current collection, the current generated by the active material in the electrode 400 can be conducted through it. Simultaneously, the current collector material has good strength and toughness, providing support and protection for the second continuous film 200 during the composite process, reducing the risk of breakage. When the foil 300 is an electrolyte substrate material, it is made of materials such as aluminum foil or PET film that can be subsequently peeled off. The electrolyte film or composite electrode formed by the electrode processing equipment can be used in solid-state battery assembly.

[0079] In some possible implementations, the unwinding device 4 may also be equipped with a foil switching mechanism for switching between different current collector materials and substrate materials.

[0080] On the other hand, combining Figure 9 As shown, this embodiment provides a method for processing dry electrode sheets, using the processing equipment of this application. The processing method includes: Step S1: At least two feeding devices 1 feed the film forming roller group 2 respectively, and the film forming roller group 2 rolls multiple batches of powder in sequence to form the first continuous film 100.

[0081] Step S2: Thinning roller group 3 performs thinning roller pressing on the first continuous film 100 to form the second continuous film 200.

[0082] Step S3: The unwinding device 4 supplies foil 300, and the foil 300 and the second continuous film 200 are stacked and fed into the composite roller group 5 for roll pressing to form an electrode 400.

[0083] Step S4: The winding device 6 winds up the electrode sheet 400 into a roll.

[0084] In the processing method of this application, at least two feeding devices 1 feed material to the film-forming roller group 2 respectively. The film-forming roller group 2 rolls multiple batches of powder sequentially to form a first continuous film 100. Since multiple batches of powder are rolled sequentially, the powder rolled first forms the initial film, and the powder rolled later is superimposed on the initial film. The rolling process of the powder is decomposed into multiple stages. The rolling amount in each stage is small, and the rolling stress is dispersed. Therefore, the first continuous film 100 formed is not easy to break even if the thickness is relatively thin.

[0085] Thinning roller assembly 3 thins the first continuous film 100 to form a second continuous film 200. The foil 300 and the second continuous film 200 are then stacked and fed into composite roller assembly 5 for roll pressing to form an electrode 400. Because the first continuous film 100 is thinned and then composited with the foil 300, the interfacial bonding is good, and the first continuous film 100 already has good integrity before composite formation. Therefore, the formed electrode 400 has good quality and can stably produce ultra-thin electrode 400 with a thickness of 10-60 micrometers.

[0086] In some possible implementations, the processing method further includes step S5 before step S1, in which active materials, conductive agents, binders, etc., are dry-mixed to form a dry powder, which is then fed to the feeding device 1. This step can ensure that the components in the dry powder are uniformly dispersed, thereby improving the uniformity of the film.

[0087] In some possible implementations, the processing method further includes step S6 after step S4, which involves curing the wound electrode 400 to further uniformly distribute the binder in the electrode 400 and improve the mechanical and electrochemical properties of the electrode 400.

[0088] On the other hand, this embodiment provides a battery, which is a liquid battery or an all-solid-state battery, and the battery includes a positive electrode and a negative electrode; at least one of the positive electrode and the negative electrode is formed by processing with the processing equipment of this application or by processing with the processing method of this application.

[0089] At least one of the positive and negative electrode plates in the battery of this embodiment is formed by processing using the processing equipment or processing method of this application, which has significant advantages in terms of energy density, rate performance, cycle life, and fast charging performance.

[0090] It should be noted that in this article, "several" and "at least one" refer to one or more, while "multiple" and "at least two" refer to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0091] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0092] It should be noted that, in this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0093] In the description of this specification, the references to the terms "certain embodiments", "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" refer to specific features, structures, materials, or characteristics described in connection with the embodiments or examples that are included in at least one embodiment or example of this application.

[0094] The above description is merely an embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the principles of this application should be included within the protection scope of this application.

Claims

1. An electrode processing device, characterized in that, include: Feeding device (1), film forming roller group (2), thinning roller group (3), unwinding device (4), composite roller group (5) and winding device (6); The feeding device (1) includes at least two feeding modules (11), which are arranged at intervals above the film forming roller group (2). The feeding modules (11) feed the film forming roller group (2) respectively, and the film forming roller group (2) outputs a first continuous film (100). The thinning roller group (3) is located downstream of the film forming roller group (2) and is used to roll the first continuous film (100) to form a second continuous film (200); The unwinding device (4), the composite roller group (5), and the winding device (6) are located downstream of the thinning roller group (3). The unwinding device (4) is used to supply foil (300). The composite roller group (5) is used to roll and laminate the second continuous film (200) with the foil (300) to form an electrode (400). The winding device (6) is used to wind up the electrode (400).

2. The electrode processing equipment according to claim 1, characterized in that, The film-forming roller group (2) includes at least four film-forming pressure rollers (21); The at least four film-forming rollers (21) are arranged in parallel at intervals, and each of the feeding modules (11) is located above two adjacent film-forming rollers (21).

3. The electrode processing equipment according to claim 2, characterized in that, The film-forming roller (21) includes a first roller (211), a second roller (212), a third roller (213), and a fourth roller (214); The feeding module (11) includes a first feeding module (111) and a second feeding module (112); The first feeding module (111) is located between the first pressure roller (211) and the second pressure roller (212). The first feeding module (111) feeds the first dry powder into the first roller gap (215) between the first pressure roller (211) and the second pressure roller (212), and the first film is formed by the first pressure roller (211) and the second pressure roller (212). The first diaphragm enters the second roll gap (216) between the third pressure roller (213) and the fourth pressure roller (214); The second feeding module (112) is located between the third pressure roller (213) and the fourth pressure roller (214). The second feeding module (112) feeds the second dry powder into the second roller gap (216), and the third pressure roller (213) and the fourth pressure roller (214) roll the first film and the second dry powder to form the first continuous film (100).

4. The electrode processing equipment according to claim 3, characterized in that, The first dry powder and the second dry powder have the same composition.

5. The electrode processing equipment according to claim 2, characterized in that, The number of the thinning roller group (3) is at least two; Each of the two film-forming rollers (21) corresponding to each feeding module (11) is provided with a thinning roller group (3) downstream.

6. The electrode processing equipment according to any one of claims 1 to 5, characterized in that, The thickness of the second continuous membrane (200) ranges from 10 to 60 micrometers.

7. The electrode processing equipment according to any one of claims 1 to 6, characterized in that, The number of feeding devices (1) is two, namely a first feeding device (101) and a second feeding device (102); The number of film-forming roller groups (2) is two, namely the first film-forming roller group (201) and the second film-forming roller group (202); The number of the thinning roller group (3) is two, namely the first thinning roller group (301) and the second thinning roller group (302); The first feeding device (101), the first film forming roller group (201) and the first thinning roller group (301) are located on one side of the composite roller group (5) in sequence, and are used to feed the second continuous film A (2001) into the composite roller group (5); The second feeding device (102), the second film forming roller group (202) and the second thinning roller group (302) are located on the other side of the composite roller group (5) in sequence, and are used to input the second continuous film B (2002) into the composite roller group (5); The composite roller group (5) is used to roll and laminate the second continuous film A (2001) and the second continuous film B (2002) onto the opposite sides of the foil (300) to form a double-sided electrode (400).

8. The electrode processing equipment according to any one of claims 1 to 7, characterized in that, The foil (300) is a current collector material or an electrolyte membrane substrate.

9. A method for processing electrode sheets, characterized in that, The processing method using the processing equipment according to any one of claims 1 to 8 includes: At least two of the feeding devices (1) feed the film forming roller group (2) respectively, and the film forming roller group (2) rolls multiple batches of powder in sequence to form the first continuous film (100); The thinning roller group (3) performs thinning roller pressing on the first continuous film (100) to form the second continuous film (200); The unwinding device (4) supplies the foil (300), and the foil (300) and the second continuous film (200) are stacked and fed into the composite roller group (5) for roll pressing to form the electrode (400); The winding device (6) winds up the electrode sheet (400) into a roll.

10. A battery, characterized in that, The battery is a liquid battery or a solid-state battery; the battery includes a positive electrode and a negative electrode. At least one of the positive electrode sheet and the negative electrode sheet is formed by processing the processing equipment according to any one of claims 1 to 8, or by processing the processing method according to claim 9.

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