Electrode slice preparation equipment, preparation method, electrode slice and battery

Abstract

The invention provides electrode plate preparation equipment, a preparation method, an electrode plate and a battery, and relates to the technical field of battery processing equipment. The equipment comprises a first feeding device, a first film forming roller, a special-shaped composite roller and die cutting equipment which are arranged in sequence, the first feeding device is used for conveying dry-method materials; the first film forming roller is used for pressing the dry-method material into a first film sheet; the unwinding roller is used for releasing the current collector; the roller surface of the special-shaped composite roller comprises a normal roller surface and a concave roller surface, and is used for realizing selective compounding through the change of the roller surface structure when the first diaphragm and the current collector pass through, so that a dressing area is formed at the corresponding position of the normal roller surface, a spacer area is formed at the corresponding position of the concave roller surface, and a first pole piece is obtained; and the die cutting equipment is used for carrying out die cutting on the first pole piece to cut off the diaphragm on the spacer region of the pole piece to obtain the prepared single-sided electrode piece, so that the pole piece preparation with the dressing layer being periodically interrupted is realized.

Description

Technical Field

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

[0002] The fabrication process of dry electrodes generally includes the following steps: material mixing, fiberization, film formation, and lamination. Among these, the film formation and lamination stages typically employ a continuous conveyor belt method, resulting in continuous electrode coating layers. However, in some cell structure designs, it is necessary for the coating layers on the electrode to exhibit periodic discontinuous characteristics to meet specific performance or assembly requirements.

[0003] Currently, existing dry electrode fabrication equipment is mainly designed for the production of continuous dressing layers, and there is no mature solution to achieve the periodic intermittent fabrication of dressing layers. Therefore, there is an urgent need to provide an electrode sheet fabrication device to achieve the periodic intermittent fabrication of electrode sheets for dressing layers. Summary of the Invention

[0004] This application provides an electrode preparation apparatus, a preparation method, an electrode sheet, and a battery, for realizing the preparation of electrode sheets with periodic intermittent coating layers.

[0005] In a first aspect, this application provides an electrode sheet fabrication apparatus, comprising:

[0006] The first feeding device is used to convey the first dry material;

[0007] The first film-forming roller is located downstream of the first feeding device and is used to press the first dry material into the first film.

[0008] Unwinding roller, used to release the current collector;

[0009] The irregularly shaped composite roller, whose roller surface includes a normal roller surface and a concave roller surface, is located downstream of the first film forming roller and the unwinding roller. It is used to achieve selective composite by changing the roller surface structure when the first film and the current collector pass through, so that the normal roller surface forms a coating area at the corresponding position and the concave roller surface forms a gap area at the corresponding position, thus obtaining the composite first electrode sheet.

[0010] The die-cutting equipment, located downstream of the shaped composite roller, is used to die-cut the first electrode sheet to remove the film on the spacer area of ​​the first electrode sheet, thereby obtaining the prepared single-sided electrode sheet.

[0011] In one possible implementation, the electrode sheet preparation equipment further includes: a second feeding device, a second film-forming roller, and a transfer roller, wherein: the second feeding device is symmetrically arranged on the other side of the shaped composite roller with respect to the first feeding device, and is used to transport the second dry material; the second film-forming roller is arranged downstream of the second feeding device and symmetrically arranged on the other side of the shaped composite roller with respect to the first film-forming roller, and is used to press the second dry material into a second film; the shaped composite roller is used to selectively composite the first film, the second film, and the current collector by changing the roller surface structure, so that the corresponding position of the normal roller surface section forms a coating area and the corresponding position of the concave roller surface section forms a gap area, thereby obtaining a composite double-sided second electrode sheet; the transfer roller is arranged downstream of the shaped composite roller, and is used to horizontally transport the second electrode sheet to the die-cutting equipment; the die-cutting equipment is also used to cut off the film on the gap area on both sides of the second electrode sheet, thereby obtaining the prepared double-sided electrode sheet.

[0012] In one possible implementation, both the first and second film-forming rollers comprise at least three rollers for pressing dry materials into films of a target thickness and target areal density.

[0013] In one possible implementation, the die-cutting equipment includes at least two sets of die-cutting devices, the belt speed of which is consistent with the belt speed of the first electrode and the second electrode, respectively.

[0014] In one possible implementation, the electrode sheet preparation equipment further includes a waste material collection device for collecting the removed membrane sheet.

[0015] In one possible implementation, the irregularly shaped composite roller includes at least one irregularly shaped roller, which includes a normal roller surface circle and a recessed roller surface circle, and the normal roller surface circle and the recessed roller surface circle are concentric circles.

[0016] In one possible implementation, the depth of the recessed roller surface is the difference between the radius of the normal roller surface circle and the radius of the recessed roller surface circle, and the length of the recessed roller surface is determined by the radius of the normal roller surface circle and its corresponding central angle.

[0017] In one possible implementation, at least one recessed roller surface is provided on the concave roller surface circle; when there are at least two recessed roller surfaces provided on the concave roller surface circle, each recessed roller surface is periodically symmetrically arranged with the normal roller surface.

[0018] In a second aspect, this application provides a method for preparing an electrode sheet, applied to the electrode sheet preparation apparatus described in any one of the first aspects, the method comprising:

[0019] The first feeding device is controlled to convey the first dry material to the first film-forming roller;

[0020] The first film-forming roller is controlled to press the first dry material into a first film sheet, and the first film sheet is conveyed to the shaped composite roller;

[0021] Control the unwinding roller to convey the current collector to the shaped composite roller;

[0022] When the first diaphragm and the current collector pass through, the change of the roller surface structure of the irregularly shaped composite roller is controlled to achieve selective composite, so that the corresponding position of the normal roller surface section forms the dressing area and the corresponding position of the concave roller surface section forms the interval area, thus obtaining the composite first electrode sheet;

[0023] The die-cutting equipment is controlled to die-cut the first electrode sheet to remove the film on the spacer area of ​​the first electrode sheet, thereby obtaining the prepared single-sided electrode sheet.

[0024] Thirdly, this application provides an electrode sheet, which is prepared by the electrode sheet preparation apparatus described in any one of the first aspects, and / or by the electrode sheet preparation method described in the second aspect.

[0025] Fourthly, this application provides a battery including the electrode sheet as described in the third aspect.

[0026] Fifthly, this application provides an electrical device including the battery described in the fourth aspect.

[0027] The implementation of this application has at least the following beneficial effects:

[0028] By introducing irregularly shaped composite rollers into the electrode preparation equipment and utilizing the special roller surface structure design of the irregularly shaped composite rollers, the periodic discontinuous preparation of electrode sheets with coating layers is realized in the continuous conveyor belt process, thereby meeting the special requirements of different cell structures. At the same time, it maintains the continuous production advantages of the traditional dry electrode preparation process, and has the characteristics of good process compatibility, high production efficiency and stable product quality. Attached Figure Description

[0029] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0030] Figure 1 A schematic diagram of an electrode sheet fabrication apparatus provided as an exemplary embodiment of this application;

[0031] Figure 2 Another schematic diagram of the electrode sheet fabrication apparatus provided as an exemplary embodiment of this application;

[0032] Figure 3 A schematic diagram of the structure of the irregularly shaped roller provided in an exemplary embodiment of this application;

[0033] Figure 4This is a schematic diagram of an electrode sheet prepared by an electrode sheet preparation apparatus, provided as an exemplary embodiment of this application.

[0034] Explanation of reference numerals in the attached figures:

[0035] 10. Electrode sheet preparation equipment; 11. First feeding device; 12. First film forming roller; 13. Unwinding roller; 14. Shaped composite roller; 15. Die-cutting equipment; 151. Die-cutting device; 152. Die-cutting device; 16. First air knife; 17. Rewinding device; 18. Second feeding device; 19. Second film forming roller; 20. Transfer roller; 21. Second air knife; 41. Current collector; 42. Coating layer.

[0036] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions in the embodiments of this invention will be clearly and completely described below in conjunction with the embodiments of this invention. Obviously, the described embodiments are only some embodiments of this invention, not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0038] In related technologies, dry electrode fabrication employs a continuous conveyor belt film formation and composite process. After material mixing and fiberization, a uniform and continuous coating layer is formed during continuous rolling. However, this method cannot precisely control the discontinuous distribution of the coating layer during continuous production, making it difficult to meet the design requirements of periodically discontinuous coating layers for special cell structures. This results in insufficient process adaptability and limits the application of dry electrodes in specific battery structures.

[0039] Based on the technical problems existing in related technologies, this application proposes an electrode sheet preparation equipment. By designing a composite roller pressing device, that is, introducing an irregularly shaped composite roller into the electrode sheet preparation equipment, and utilizing the special roller surface structure design of the irregularly shaped composite roller, the periodic and intermittent preparation of the electrode sheet with the coating layer is realized in the continuous conveyor belt process, thereby meeting the special requirements of different cell structures.

[0040] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0041] Figure 1 This is a schematic diagram of an electrode sheet fabrication apparatus provided as an exemplary embodiment of this application. Figure 1 As shown, the electrode fabrication apparatus 10 includes:

[0042] The first feeding device 11 is used to convey the first dry material;

[0043] The first film-forming roller 12 is located downstream of the first feeding device 11 and is used to press the first dry material into a first film.

[0044] Unwinding roller 13 is used to release the current collector;

[0045] The irregularly shaped composite roller 14, whose roller surface includes a normal roller surface and a concave roller surface, is located downstream of the first film forming roller 12 and the unwinding roller 13. It is used to achieve selective composite by changing the roller surface structure when the first film and the current collector pass through, so that the normal roller surface forms a coating area at the corresponding position and the concave roller surface forms a gap area at the corresponding position, thus obtaining the composite first electrode sheet.

[0046] Die-cutting equipment 15 is located downstream of the irregular composite roller 14 and is used to die-cut the first electrode to remove the film on the spacer area of ​​the first electrode.

[0047] The first air knife 16 is located downstream of the die-cutting equipment 15 and is used to blow off the cut film.

[0048] The winding device 17 is located downstream of the first air knife 16 and is used to wind up the prepared single-sided electrode sheet.

[0049] The preparation steps of the dry material are as follows: Active materials such as conductive agents and binders are weighed according to a set ratio, mixed using a high-speed disperser or other mixing equipment, and the mixed material undergoes preliminary fibrosis treatment to obtain the dry material. Optionally, the dry material can be a positive electrode material, with the corresponding active material being a positive electrode active material or a positive electrode material; or the dry material can also be a negative electrode material, with the corresponding active material being a negative electrode active material or a negative electrode material. Accordingly, if used for the preparation of electrode sheets for all-solid-state batteries, the mixture of the above-mentioned active materials such as conductive agents and binders needs to be mixed with a solid electrolyte in a certain proportion.

[0050] For example, such as Figure 1As shown, the first dry material is fed into the gap of the first film-forming roller 12 via the first feeding device 11. The first film-forming roller 12 presses the first dry material into a first film sheet, which then reaches the shaped composite roller 14. The current collector is unwound by the unwinding roller 13 and reaches the shaped composite roller 14. The shaped composite roller 14 is a roller with a partially concave roller surface. When the first film sheet and the current collector pass through the gap of the shaped composite roller 14, at the position corresponding to the normal roller surface, the film sheet is laminated onto the current collector, forming a coating area; at the position corresponding to the concave roller surface, the film sheet is not laminated onto the current collector, forming a gap area. Accordingly, according to To meet the requirements of electrode design, the length of the normal roller surface and the length of the concave roller surface of the irregular composite roller 14 can be controlled separately to obtain a fixed length of auxiliary material area and spacer area. Further, after being composited by the irregular composite roller 14, a composite first electrode is obtained. The first electrode is conveyed to the die-cutting equipment 15, which performs die-cutting on the interface between the auxiliary material area and the spacer area, and the die-cutting depth is the thickness of the film without damaging the current collector, so as to remove the film on the spacer area of ​​the first electrode. Then it is conveyed to the first air knife 16, which blows off the film on the spacer area, thereby obtaining a single-sided electrode with a periodic spacer area.

[0051] In this embodiment, by introducing a shaped composite roller into the electrode preparation equipment and utilizing the special roller surface structure design of the shaped composite roller, the periodic discontinuous preparation of the electrode sheet with the coating layer is realized in the continuous conveyor belt process, thereby meeting the special requirements of different cell structures. At the same time, it maintains the continuous production advantages of the traditional dry electrode preparation process, and has the characteristics of good process compatibility, high production efficiency and stable product quality.

[0052] In one specific embodiment, the electrode sheet preparation equipment further includes: a second feeding device, a second film-forming roller, a transfer roller, and a second air knife, wherein: the second feeding device is symmetrically arranged on the other side of the shaped composite roller with respect to the first feeding device, and is used to convey the second dry material; the second film-forming roller is arranged downstream of the second feeding device and symmetrically arranged on the other side of the shaped composite roller with respect to the first film-forming roller, and is used to press the second dry material into a second film; the shaped composite roller is used to selectively composite the first film, the second film, and the current collector by changing the roller surface structure, so that the corresponding position of the normal roller surface section forms a coating area and the corresponding position of the concave roller surface section forms a gap area, thereby obtaining a composite double-sided second electrode sheet; the transfer roller is arranged downstream of the shaped composite roller, and is used to horizontally transport the second electrode sheet to the die-cutting equipment; the die-cutting equipment is used to cut off the film on the gap area on both sides of the second electrode sheet; the second air knife is arranged downstream of the die-cutting equipment, and is used to blow off the cut film corresponding to the second electrode sheet, thereby obtaining the prepared double-sided electrode sheet.

[0053] For example, Figure 2 Another schematic diagram of the electrode sheet fabrication apparatus provided for an exemplary embodiment of this application. (See diagram below.) Figure 2 As shown, the electrode sheet preparation equipment 10 also includes: a second feeding device 18, a second film-forming roller 19, a transfer roller 20, and a second air knife 21. Its specific working process is as follows: First dry material is fed into the roll gap of the first film-forming roller 12 via the first feeding device 11, and the first dry material is pressed into a first film by the first film-forming roller 12, reaching the shaped composite roller 14; on the other side, second dry material is fed into the roll gap of the second film-forming roller 19 via the second feeding device 18, and the second dry material is pressed into a second film by the second film-forming roller 19, reaching the shaped composite roller 14; the current collector is unwound by the unwinding roller 13 and reaches the shaped composite roller 14; when the first film, the second film, and the current collector pass through the roll gap of the shaped composite roller 14, at the corresponding positions on the normal roller face, the film is composited onto the current collector, forming a coating area; at the concave roller face... In the correct position, the diaphragm will not be placed on the composite current collector, forming a gap area, resulting in a double-sided second electrode sheet after composite formation. The first diaphragm is located on one side of the second electrode sheet, and the second diaphragm is located on the other side of the second electrode sheet. The second electrode sheet is conveyed to the die-cutting equipment 15 via the transfer roller 20. The die-cutting equipment 15 simultaneously die-cuts the interface between the coating area and the gap area on both sides of the second electrode sheet, and the die-cutting depth is the thickness of the diaphragm without damaging the current collector, so as to remove the diaphragm on the gap area on both sides of the second electrode sheet. Afterwards, it is conveyed to the first air knife 16 and the second air knife 21 respectively. The first air knife 16 and the second air knife 21 are used to blow off the diaphragm on the corresponding gap area, thereby obtaining a double-sided electrode sheet with periodic gap areas.

[0054] It should be noted that the first dry process material and the second dry process material can be the same material or different materials. In practical applications, different materials can be selected and combined according to specific process and product performance requirements. No specific restrictions are made here.

[0055] In this embodiment, by symmetrically arranging a feeding device, a film-forming roller, and an air knife in the electrode sheet preparation equipment, and by performing double-sided sheet composite through a shaped composite roller downstream of the symmetrically arranged film-forming roller, a double-sided electrode sheet with periodically spaced regions is obtained, which further meets the special requirements of different cell structures.

[0056] In one specific embodiment, both the first film-forming roller and the second film-forming roller contain at least three rollers for pressing dry materials into films of a target thickness and target areal density.

[0057] For example, both the first and second film-forming rollers consist of three rollers. Accordingly, when the first and second film-forming rollers are operating, the dry material is first initially compacted through the first roller gap to form a primary film with a certain strength. It then enters the second roller gap for further rolling, thinning the film to a target thickness, such as 100μm-300μm, and a target areal density, such as 20 mg / cm²-50 mg / cm². The roller gaps and pressures between each roller can be independently adjusted to accommodate different formulations of dry materials.

[0058] It should be noted that the above-mentioned first and second film-forming rollers both containing 3 rollers are only an example. In actual applications, there can also be 4 rollers corresponding to 3 roller gaps, or 5 rollers corresponding to 4 roller gaps, etc.

[0059] In this embodiment, a multi-stage progressive rolling process can achieve precise control over the thickness and areal density of the membrane, reducing material structural damage that may be caused by a single high-pressure rolling process, and ensuring the uniformity and integrity of the membrane. Furthermore, the multi-stage rolling design allows the fiber network in the dry material to gradually align, which helps to improve the mechanical strength and flexibility of the membrane.

[0060] In one specific embodiment, the die-cutting equipment includes at least two sets of die-cutting devices, the belt speed of which is consistent with the belt speed of the first electrode and the second electrode, respectively.

[0061] For example, such as Figure 1 and Figure 2 As shown, the die-cutting equipment 15 includes a die-cutting device 151 and a die-cutting device 152. Correspondingly, as... Figure 1 As shown, during the operation of the die-cutting equipment 15, the first electrode moves along the conveyor belt at a specific speed. For example, when the first electrode moves at a speed of 5 meters per minute, the corresponding die-cutting device, such as die-cutting device 151, also performs conveyor belt movement and die-cutting operations at a speed of 5 meters per minute; similarly, as... Figure 2 As shown, during the operation of the die-cutting equipment 15, if the second electrode sheet moves at a speed of 4 meters per minute, its corresponding die-cutting devices, such as die-cutting device 151 and die-cutting device 152, also move at a speed of 4 meters per minute to ensure that the die-cutting process is synchronized with the electrode sheet moving.

[0062] In this embodiment, by setting the conveyor speed of the die-cutting device to be consistent with the conveyor speed of the electrode sheet, the precision of the die-cutting operation can be guaranteed. This ensures that speed differences do not cause die-cutting position deviations during the die-cutting process, thereby guaranteeing accurate removal of the film from the electrode spacer area and significantly improving product quality stability. Simultaneously, synchronized conveyor speeds avoid problems such as pulling or piling that may occur due to speed mismatch, thus significantly improving production efficiency and effectively reducing raw material waste and production costs caused by die-cutting errors.

[0063] In one specific embodiment, the electrode sheet preparation equipment further includes: a waste material collection device for collecting the removed membrane sheet.

[0064] For example, a waste material collection device is set below or near the air knife. This waste material collection device is a box structure with a certain capacity and is equipped with a guide component to guide the diaphragm into it. Accordingly, when the air knife blows the diaphragm in the interval area, the diaphragm falls into the waste material collection device along the guide component under the action of airflow or its own gravity. The collected waste material can then be transported to the corresponding granulation equipment for granulation. After granulation, the waste material can be reused in the early stages of electrode sheet preparation, such as material mixing, to achieve reuse.

[0065] In this embodiment, by collecting the excised membrane sheets that might otherwise be treated as waste, and reusing them after granulation, the utilization rate of raw materials is greatly improved and the production cost is significantly reduced. In addition, the recycled and reused waste materials can ensure the stability of the materials, reduce product quality fluctuations that may be caused by batch differences of new materials, and help improve the stability of the electrode sheet preparation process and the consistency of the products.

[0066] In one specific embodiment, the irregularly shaped composite roller includes at least one irregularly shaped roller, which includes a normal roller surface circle and a recessed roller surface circle, and the normal roller surface circle and the recessed roller surface circle are concentric circles.

[0067] For example, in one implementation, both rollers in the irregularly shaped composite roller are irregularly shaped rollers; in another implementation, one is an irregularly shaped roller and the other is a normal roller. For instance, Figure 3 A schematic diagram of the structure of the irregularly shaped roller provided as an exemplary embodiment of this application. For example... Figure 3 (a) and Figure 3 As shown in (b), the irregular roller includes a normal roller surface circle and a concave roller surface circle, and the normal roller surface circle and the concave roller surface circle are concentric circles.

[0068] In one specific embodiment, the depth of the recessed roller surface is the difference between the radius of the normal roller surface circle and the radius of the recessed roller surface circle, and the length of the recessed roller surface is determined by the radius of the normal roller surface circle and its corresponding central angle.

[0069] For example, assuming the radius of the normal roll surface circle is R1 and the radius of the recessed roll surface circle is R2, the depth h of the recessed roll surface is the difference between R1 and R2. Correspondingly, the length L1 of the recessed roll surface is determined by the radius R1 of the normal roll surface circle and its corresponding central angle θ. The length L2 of the gap area formed during rolling is determined by the diameter R2 of the recessed roll surface circle and the central angle θ, for example, L1 = πR1θ / 180°, L2 = πR2θ / 180°. Accordingly, by adjusting the ratio of R1 to R2 and the value of θ, the proportion of the gap area can be precisely controlled.

[0070] In one specific embodiment, at least one recessed roller surface is provided on the concave roller surface circle; when there are at least two recessed roller surfaces provided on the concave roller surface circle, each concave roller surface is periodically symmetrically arranged with the normal roller surface.

[0071] For example, such as Figure 3 As shown in (a), a recessed roller surface is provided on the circular recessed roller surface; as Figure 3 As shown in (b), two recessed roller surfaces are symmetrically arranged on the concave roller surface circle; correspondingly, three or more concave roller surfaces can also be symmetrically arranged on the concave roller surface circle.

[0072] For example, Figure 4 This is a schematic diagram of an electrode sheet fabricated using an electrode sheet fabrication apparatus, provided as an exemplary embodiment of this application. Figure 4 As shown, the electrode sheet includes a current collector 41 and a film 42 (i.e., a dressing layer) periodically and intermittently laminated onto the current collector 41. Wherein, Figure 4 (a) in the figure is a top view of a single-sided or double-sided electrode sheet. Figure 4 (b) in the figure is a cross-sectional view of a single-sided electrode sheet. Figure 4 (c) in the figure is a cross-sectional view of the double-sided electrode sheet.

[0073] In one specific embodiment, the electrode sheet preparation equipment further includes: a visual recognition system, a thickness or areal density monitoring system, and a tension control system, etc.

[0074] For example, the vision recognition system is installed at key locations on the equipment, such as near the irregularly shaped composite roller and before and after the die-cutting equipment. At the irregularly shaped composite roller, the vision recognition system can capture image information of the composite of the film and the current collector in real time. Through image analysis algorithms, it can accurately identify whether there are any abnormalities such as deviations or foreign objects during the composite process. Before and after the die-cutting equipment, the vision recognition system can inspect the appearance of the electrode sheet, check whether the die-cutting is complete, and whether there are scratches or damages on the surface of the electrode sheet, and promptly feed the inspection results back to the equipment's control system. Correspondingly, thickness or areal density monitoring systems can be distributed in key process stages such as film formation and lamination. For example, during the process of the first film-forming roller pressing the first dry material into the first film sheet, the system can measure the thickness or areal density of the film sheet in real time to ensure that the film quality meets the requirements. During the lamination operation of the irregularly shaped lamination roller, the thickness or areal density of the laminated electrode sheet can also be monitored to ensure that the parameters of the coating area and the gap area meet the design standards. If abnormal data is detected, the system will immediately issue an alarm and adjust the relevant process parameters. Correspondingly, the tension control system runs through the entire belt-carrying process and works in coordination with the unwinding roller, the winding device, and each belt-carrying roller. For example, during the process of the current collector being released from the unwinding roller and the electrode sheet being wound into the winding device, the tension control system senses the tension change of the electrode sheet in real time and ensures the stability of the electrode sheet tension by adjusting the unwinding and winding speeds and the rotation speed of each belt-carrying roller. When the electrode sheet belt-carrying speed changes, the tension control system will respond quickly and adjust the operating parameters of the relevant components to prevent the electrode sheet from being stretched and deformed due to excessive tension or wrinkled due to insufficient tension. Through the coordinated operation of these systems, the electrode fabrication equipment can achieve efficient, stable, and high-quality electrode production.

[0075] This application also provides a method for preparing an electrode sheet, applied to the electrode sheet preparation equipment described in any of the above embodiments. The electrode sheet preparation method includes the following steps:

[0076] (1) Control the first feeding device to convey the first dry material to the first film forming roller;

[0077] (2) Control the first film-forming roller to press the first dry material into the first film sheet, and convey the first film sheet to the irregular composite roller;

[0078] (3) Control the unwinding roller to convey the current collector to the shaped composite roller;

[0079] (4) When the first diaphragm and the current collector pass through, the change of the roller surface structure of the irregular composite roller is controlled to achieve selective composite, so that the corresponding position of the normal roller surface section forms the dressing area and the corresponding position of the concave roller surface section forms the interval area, thus obtaining the composite first electrode.

[0080] (5) Control the die-cutting equipment to die-cut the first electrode to remove the film on the spacer area of ​​the first electrode;

[0081] (6) Control the first air knife to blow off the excised membrane;

[0082] (7) Control the winding device to wind up the prepared single-sided electrode sheet.

[0083] The dry materials used in the above process can be obtained by mixing several of the positive electrode active material, conductive agent, solid electrolyte, and binder in a certain proportion and then pre-fiberizing them, or by mixing several of the negative electrode active material, conductive agent, solid electrolyte, and binder in a certain proportion and then pre-fiberizing them. The prepared electrode sheets can be used in traditional liquid batteries or all-solid-state batteries.

[0084] For example, the positive electrode active material is at least one of lithium nickel cobalt aluminum oxide, lithium nickel cobalt manganese oxide, LiFePO4, LiFe0.2Mn0.8PO4, LiMn2O4, LiCoPO4, LiNiO2, LiNi0.5Mn1.5O4, LiCoO2, LiTiS2, LiNiO2, elemental sulfur, and sulfur-carbon mixtures; further, the positive electrode active material for all-solid-state batteries also includes a nano-coating layer, the material of which is selected from at least one of Li3PO4, Al2O3, LiNbO3, LiAlO2, Li3BO3, Li2OZrO2, MgO, HfO2, Li2SiO3, B2O3, Li2O, Nb2O5, P2O5, SiO2, Sc2O3, TiO2, and ZrO2; the negative electrode active material is selected from one or a mixture of several of graphite, silicon, silicon oxide, graphene, soft carbon, and hard carbon; the conductive agent is selected from Super At least one of P, VGCF, carbon nanotubes, acetylene black, Ketjen black, and conductive graphene; the binder is selected from at least one of polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), styrene-butadiene rubber (SBR), polyacrylic acid (PAA), polyimide (PI), polyacrylonitrile (PAN), polypropylene (PP), polyethylene (PE), and polystyrene (PS); the solid electrolyte may include sulfide solid electrolytes, oxidized solid electrolytes, and halide electrolytes, etc., and the sulfide electrolyte is selected from Li 10 GeP2S 12 Li 9.54 Si 1.74 P 1.44 S 11.7 C l0.3 Li 9.6 P3S 12 Li 7-y PS 6-y X y Li 1.4 Al 0.4 Ti 1.6Any one or a combination of two or more of (PO4)3, etc., wherein X is selected from any one of Cl, Br or I, and the value range of y is 0.8 ≤ y ≤ 2.0; the oxide solid electrolyte includes Li 7-x La3Zr 2-x Ta x O 12 、Li 7-2k La3Zr 2-k W k O 12 、Li 7-z La3Zr 2-z Nb z O 12 、Li7La3Zr2O 12 、Li 1+ m Al m Ti 2-m (PO4)3, LiPON and Li 1+n Al n Ge 2-n (PO4)3, etc., wherein 0.2 < x < 2, 0.2 < k < 2, 0.2 < z < 2, 0.2 < m < 2, 0.2 < n < 2; the halide solid electrolyte may specifically include any one or a combination of two or more of Li3YCl6, Li3ErCl6, Li3YBr6, Li3InBr6 and Li3InCl6.

[0085] The present application also provides an electrode sheet, which is obtained by the preparation equipment of the electrode sheet described in any one of the above embodiments, and / or, the electrode sheet is obtained by the electrode sheet preparation method in the above embodiments.

[0086] The present application also provides a battery, including the electrode sheet described in the above embodiments.

[0087] The present application does not make special limitations on the preparation method of the battery, and it can be prepared by referring to the conventional methods in the art.

[0088] For example, in a specific embodiment, the battery can be prepared by the following steps:

[0089] The electrode sheets prepared in the above manner are cut to match the size of the battery's internal space. The cut electrode sheets are then dried to remove any moisture that may be present on their surface and inside. The pre-treated electrode sheets are then placed into the battery casing in the order of positive and negative electrodes, with a separator placed between them. The material and thickness of the separator must be selected according to the battery type to ensure good ion conductivity and insulation. The pre-prepared electrolyte is injected into the battery casing to fully wet the electrode sheets and separator. After injecting the electrolyte, the battery is sealed using methods such as laser welding or heat sealing to ensure a good seal and prevent electrolyte leakage. The assembled battery is then... The batteries are placed in a formation device and charged and discharged according to a predetermined formation process. The formation process can form a stable solid electrolyte interphase (SEI) film on the electrode surface to improve the cycle stability and safety of the battery. After formation, the batteries are classified according to their capacity and performance, grouping batteries with similar performance together for subsequent use and sale. Furthermore, the classified batteries undergo comprehensive performance testing, including indicators such as voltage, internal resistance, capacity, and cycle life. Specifically, professional testing equipment is used to accurately measure the batteries to ensure that their performance meets design requirements. Through the above preparation steps, a battery with stable performance is obtained.

[0090] Alternatively, the negative electrode and positive electrode sheets, as well as the electrolyte sheet, prepared in the above manner are stacked and assembled in a predetermined order; then, a hot pressing process is used to form good interfacial contact between the layers of materials; next, the assembled cell is packaged; finally, an isostatic pressing process is used to further improve the interfacial bonding strength between the electrode and the electrolyte, thereby obtaining a battery with stable performance.

[0091] This application also provides an electrical device, including the battery described above.

[0092] This application does not specifically limit the electrical equipment, which can be any electrical equipment including the battery, including but not limited to mobile phones, portable devices, laptops, electric bicycles, electric cars, electric toys, and energy storage devices.

[0093] The battery provided in this application will be further described below with reference to specific embodiments.

[0094] Unless otherwise specified, the reagents, materials and instruments used in the following examples are all conventional reagents, materials and instruments in the art, and can be obtained commercially. The reagents involved can also be synthesized by conventional methods in the art.

[0095] Example 1

[0096] This embodiment provides a battery, the preparation method of which is as follows:

[0097] (1) Preparation of positive electrode sheet: Ternary materials with high energy density and good electrochemical performance, such as lithium nickel cobalt manganese oxide, are selected as positive electrode active materials, wherein the ternary materials account for 80% of the mass of the positive electrode sheet; the binder accounts for 2.5% to enhance the adhesion between the active material and the current collector; the conductive agent accounts for 1% to improve the electronic conductivity of the electrode; the solid electrolyte LPSCL accounts for 16.5% to ensure the transport of lithium ions in the positive electrode; further, the ternary materials, binder, conductive agent and solid electrolyte LPSCL are mixed using a high-speed disperser and other mixing equipment, and preliminary fiberization treatment is carried out to obtain dry material 1; control The first feeding device conveys the dry material 1 to the first film-forming roller; the first film-forming roller is controlled to press the dry material 1 into a first film, and the first film is conveyed to the shaped composite roller; the unwinding roller is controlled to convey the current collector to the shaped composite roller; when the first film and the current collector pass through, the roller surface structure of the shaped composite roller is controlled to achieve selective composite, so that the corresponding position of the normal roller surface section forms a coating area and the corresponding position of the concave roller surface section forms a gap area, thus obtaining the composite first electrode sheet; the die-cutting equipment is controlled to die-cut the first electrode sheet to remove the film on the gap area of ​​the first electrode sheet; the first air knife is controlled to blow off the removed film; the winding device is controlled to wind up the prepared electrode sheet, thus obtaining the positive electrode sheet.

[0098] (2) Preparation of negative electrode sheet: Silicon material is used as the negative electrode active material, and the proportion of silicon material in the negative electrode sheet is 66%; the proportion of conductive agent is 2% to ensure the electron conduction of the negative electrode; the proportion of binder is 2% to maintain the stability of the negative electrode structure; the proportion of solid electrolyte is 30%; further, the ternary material, binder, conductive agent and solid electrolyte LPSCL are mixed using a high-speed disperser and other mixing equipment, and preliminary fiberization treatment is carried out to obtain dry material 2; the first feeding device is controlled to convey the dry material 1 to the first film forming roller; the first film forming roller is controlled to convey the dry material 1 to the first film forming roller. Material 2 is pressed into a first diaphragm and conveyed to a shaped composite roller; the unwinding roller is controlled to convey the current collector to the shaped composite roller; as the first diaphragm and the current collector pass through, the roller surface structure of the shaped composite roller is controlled to achieve selective composite, so that the corresponding position of the normal roller surface section forms a coating area and the corresponding position of the concave roller surface section forms a gap area, thus obtaining the composite first electrode sheet; the die-cutting equipment is controlled to die-cut the first electrode sheet to remove the diaphragm on the gap area of ​​the first electrode sheet; the first air knife is controlled to blow off the removed diaphragm; the winding device is controlled to wind up the prepared electrode sheet, thus obtaining the negative electrode sheet.

[0099] (3) The negative electrode and positive electrode, as well as the electrolyte sheet, etc., prepared by the above method are stacked and assembled in a predetermined order;

[0100] (4) Hot pressing process is used to form good interfacial contact between the layers of material;

[0101] (5) The assembled battery cells are then packaged.

[0102] (6) The interfacial bonding strength between the electrode and the electrolyte is further improved by isostatic pressing process, thereby obtaining a battery with stable performance, and the coating layer in the electrode sheet of the battery is periodically discontinuous.

[0103] It should be noted that the proportions of each component in the above steps are just examples. In actual applications, they can be flexibly adjusted according to the actual application requirements. There are no restrictions on the proportions of each component in the above steps.

[0104] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An electrode sheet preparation device, characterized in that, include: The first feeding device is used to convey the first dry material; The first film-forming roller is located downstream of the first feeding device and is used to press the first dry material into a first film. Unwinding roller, used to release the current collector; The irregularly shaped composite roller, whose roller surface includes a normal roller surface and a concave roller surface, is located downstream of the first film forming roller and the unwinding roller. It is used to achieve selective composite by changing the roller surface structure when the first film and the current collector pass through, so that the normal roller surface forms a coating area at the corresponding position and the concave roller surface forms a gap area at the corresponding position, thus obtaining the composite first electrode sheet. A die-cutting device, located downstream of the shaped composite roller, is used to die-cut the first electrode sheet to remove the film on the spacer area of ​​the first electrode sheet, thereby obtaining a prepared single-sided electrode sheet.

2. The electrode sheet preparation equipment according to claim 1, characterized in that, Also includes: The second feeding device, the second film-forming roller, and the intermediate roller, wherein: The second feeding device is symmetrically arranged on the other side of the irregularly shaped composite roller with respect to the first feeding device, and is used to convey the second dry material; The second film-forming roller is located downstream of the second feeding device and is symmetrically arranged on the other side of the irregular composite roller with respect to the first film-forming roller, and is used to press the second dry material into a second film. The irregularly shaped composite roller is used to achieve selective composite by changing the roller surface structure when the first diaphragm, the second diaphragm and the current collector pass through, so that the corresponding position of the normal roller surface section forms a dressing area and the corresponding position of the concave roller surface section forms a gap area, thus obtaining a double-sided second electrode sheet after composite. The transfer roller is located downstream of the irregularly shaped composite roller and is used to horizontally transport the second electrode sheet to the die-cutting equipment. The die-cutting equipment is used to remove the film on the spacer area on both sides of the second electrode sheet to obtain the prepared double-sided electrode sheet.

3. The electrode sheet preparation equipment according to claim 2, characterized in that, Both the first film-forming roller and the second film-forming roller contain at least three rollers for pressing dry materials into films of target thickness and target areal density.

4. The electrode sheet preparation equipment according to claim 2, characterized in that, The die-cutting equipment includes at least two sets of die-cutting devices, and the conveyor speed of the die-cutting devices is consistent with the conveyor speed of the first electrode and the second electrode, respectively.

5. The electrode sheet preparation apparatus according to any one of claims 1 to 4, characterized in that, Also includes: The waste material collection device is used to collect the removed membrane.

6. The electrode sheet preparation apparatus according to any one of claims 1 to 4, characterized in that, The irregularly shaped composite roller includes at least one irregularly shaped roller, which includes a normal roller surface circle and a concave roller surface circle, wherein the normal roller surface circle and the concave roller surface circle are concentric circles.

7. The electrode sheet preparation apparatus according to claim 6, characterized in that, The depth of the recessed roller surface is the difference between the radius of the normal roller surface circle and the radius of the recessed roller surface circle, and the length of the recessed roller surface is determined by the radius of the normal roller surface circle and its corresponding central angle.

8. The electrode sheet preparation equipment according to claim 6, characterized in that, At least one recessed roller surface is provided on the concave roller surface circle; when there are at least two recessed roller surfaces provided on the concave roller surface circle, each of the concave roller surfaces is periodically symmetrically arranged with the normal roller surface.

9. A method for preparing an electrode sheet, characterized in that, The electrode preparation apparatus according to any one of claims 1 to 8, wherein the electrode preparation method comprises: The first feeding device is controlled to convey the first dry material to the first film-forming roller; The first film-forming roller is controlled to press the first dry material into a first film sheet, and the first film sheet is conveyed to the shaped composite roller; Control the unwinding roller to convey the current collector to the shaped composite roller; When the first diaphragm and the current collector pass through, the change of the roller surface structure of the irregularly shaped composite roller is controlled to achieve selective composite, so that the corresponding position of the normal roller surface section forms the dressing area and the corresponding position of the concave roller surface section forms the interval area, thus obtaining the composite first electrode sheet; The first electrode sheet is die-cut using a controlled die-cutting device to remove the film on the spacer area of ​​the first electrode sheet, thereby obtaining a prepared single-sided electrode sheet.

10. An electrode sheet, characterized in that, The electrode sheet is prepared by the electrode sheet preparation equipment according to any one of claims 1 to 8, and / or by the electrode sheet preparation method according to claim 9.

11. A battery comprising the electrode sheet as claimed in claim 10.

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