Battery pole piece manufacturing device and battery manufacturing equipment

Abstract

The embodiment of the utility model provides a battery pole piece manufacturing device and battery manufacturing equipment, the battery pole piece manufacturing device comprises a manufacturing assembly and a shaping device, the manufacturing assembly is configured to manufacture pole pieces, and the shaping device is arranged at the downstream of the manufacturing assembly. The shaping device is configured to reduce the thickness of the preset position of the pole piece manufactured by the manufacturing assembly, the shaping device comprises a support, a supporting wheel and a pressing wheel, the supporting wheel and the pressing wheel are both installed on the support, and a first gap is formed between the pressing wheel and the supporting wheel so that the thickness of the preset position of the pole piece can be reduced when the pole piece passes through the first gap. According to the utility model, the preset position of the pole piece can be thinned through the shaping device, so that thick edges can be eliminated, no drum edge is generated during winding, and the manufacturing quality of the pole piece is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery pole piece manufacturing device and battery manufacturing equipment. Background Art

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] During the battery manufacturing process, the manufacturing quality of the electrode directly affects the quality of the battery, and affects the battery's service life and reliability.

[0004] The above statements are only used to provide background information related to the present invention and do not necessarily constitute prior art. Utility Model Content

[0005] The utility model provides a battery pole piece manufacturing device and battery manufacturing equipment, which can effectively improve the manufacturing quality of the pole piece.

[0006] In a first aspect, the utility model provides a battery pole piece manufacturing device, comprising a manufacturing component and a shaping device, wherein the manufacturing component is configured to manufacture pole pieces, the shaping device is arranged downstream of the manufacturing component, and the shaping device is configured to reduce the thickness of a preset position of the pole piece manufactured by the manufacturing component.

[0007] In some embodiments, the shaping device includes a bracket, a support wheel and a pressure wheel, both of which are installed on the bracket, and there is a first gap between the pressure wheel and the support wheel so that the thickness of the pole piece at a preset position is reduced when the pole piece passes through the first gap.

[0008] In some embodiments, the pressure wheel and / or the support wheel are rotatable relative to the bracket.

[0009] In some embodiments, the size of the first gap decreases along the axis of the pressure wheel.

[0010] In some embodiments, the size of the first gap first decreases and then increases along the axis of the pressure wheel.

[0011] In some embodiments, the diameter of the pressure wheel increases along its axial direction or increases first and then decreases.

[0012] In some embodiments, an outer edge of a cross section of the pressure wheel through its axis includes an arc-shaped portion.

[0013] In some embodiments, the arc height of the arc portion is greater than 0 mm and less than or equal to 1 mm.

[0014] In some embodiments, the size of the first gap is adjustable.

[0015] In some embodiments, the shaping device further includes a first adjusting mechanism, which is drivingly connected to the pressure wheel, and the first adjusting mechanism is configured to drive the pressure wheel to move relative to the supporting wheel to adjust the size of the first gap.

[0016] In some embodiments, the shaping device also includes a detection device and a control device. The detection device is configured to detect the thickness of the pole piece after passing through the first gap. The control device is signal-connected to the detection device and the first adjustment mechanism. The control device is configured to control the action of the first adjustment mechanism according to the detection result of the detection device.

[0017] In some embodiments, the shaping device includes a plurality of pressing wheels, and the plurality of pressing wheels are arranged in a direction parallel to the axis of the supporting wheel.

[0018] In some embodiments, there is a second gap between two adjacent pressing wheels, and the size of the second gap is adjustable.

[0019] In some embodiments, the shaping device also includes a second adjustment mechanism, which is disposed on the bracket, and the pressure wheel is installed on the second adjustment mechanism. The second adjustment mechanism is configured to drive the pressure wheel to move relative to the bracket in a direction parallel to the axis of the support wheel to adjust the size of the second gap.

[0020] In some embodiments, the second adjustment mechanism includes a guide rail disposed on the bracket, a slider cooperating with the guide rail, and a second driving device, the second driving device is configured to drive the slider to slide along the guide rail, and the pressure wheel is installed on the slider.

[0021] In some embodiments, sizes of the first gaps between the plurality of pressure wheels and the support wheels can be adjusted independently.

[0022] In some embodiments, the shaping device further includes a mounting shaft and a gasket. The mounting shaft is disposed on the bracket. A plurality of pressure wheels are mounted on the mounting shaft. The gasket is disposed between two adjacent pressure wheels located on the same mounting shaft.

[0023] In some embodiments, the shaping device further comprises a third adjustment mechanism, and the third adjustment mechanism is configured to adjust the angle between the axis of the pressure wheel and the axis of the support wheel.

[0024] In some embodiments, the roughness of the outer circumferential surface of the pressure wheel is 0.01-0.5.

[0025] In a second aspect, the utility model provides a battery manufacturing device, including the above-mentioned battery pole piece manufacturing device.

[0026] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments of the utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the drawings without creative work.

[0028] Figure 1 It is a schematic structural diagram of some embodiments of the battery pole piece manufacturing device disclosed in the utility model.

[0029] Figure 2 It is a structural schematic diagram of a shaping device in some embodiments of a battery pole piece manufacturing device disclosed in the utility model.

[0030] Figure 3 It is a front view of a shaping device in some embodiments of a battery pole piece manufacturing device disclosed in the utility model.

[0031] Figure 4 It is a side view of a pressing wheel in some embodiments of the battery pole piece manufacturing device disclosed in the utility model.

[0032] Figure 5 It is a cross-sectional view of a pressing wheel in some embodiments of the battery pole piece manufacturing device disclosed in the utility model.

[0033] In the drawings, the drawings are not drawn to scale.

[0034] Marking instructions: 10. Manufacturing assembly; 11. First roller; 12. Second roller; 13. Third roller; 14. Fourth roller; 15. Cutter device; 16. Material guide device; 17. Current collector; 20. Shaping device; 21. Bracket; 211. First mounting plate; 212. Second mounting plate; 22. Support wheel; 23. Pressure wheel; 24. First adjusting mechanism; 241. First driving device; 242. Mounting frame; 25. Second adjusting mechanism; 251. Guide rail; 252. Slider; 253. Second driving device; 26. Mounting shaft; 27. Gasket; 28. Third adjusting mechanism; 30. Pole piece. DETAILED DESCRIPTION

[0035] The following embodiments of the technical solution of the utility model are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by technicians in the technical field to which the present invention belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" in the specification and claims of the present invention and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0037] In the description of the embodiments of the present utility model, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In addition, the term "vertical" does not mean vertical in the strict sense, but is within the allowable error range. "Parallel" does not mean parallel in the strict sense, but is within the allowable error range.

[0038] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0039] In the description of the embodiments of the present utility model, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships, for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0040] In the description of the embodiments of the present invention, the term "multiple" refers to more than two, unless otherwise clearly defined. Similarly, "multiple groups" refers to more than two groups, and "multiple sheets" refers to more than two sheets, unless otherwise clearly defined.

[0041] In the description of the embodiments of the present invention, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0042] In the description of the embodiments of the present utility model, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0043] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding. With the continuous expansion of the demand for power batteries, higher requirements are also put forward for the manufacturing quality of batteries.

[0044] In some embodiments, the battery may include a box and a battery module, wherein the box is used to provide a storage space for the battery module, and the battery module is installed in the box. The box may be made of metal. The battery module may include a plurality of battery cells connected in series, in parallel, or in mixed connection. A battery cell is the smallest unit that constitutes a battery. A battery cell includes an electrode assembly that can undergo an electrochemical reaction.

[0045] In some embodiments, the battery may include a case and battery cells, wherein the battery cells are housed in the case.

[0046] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0047] In some embodiments, the box includes a box body and a box cover covering the open side of the box body. The box body and the box cover can provide a storage space for the battery cells, and provide cooling, sealing and anti-collision functions, and can also prevent liquids or other foreign objects from adversely affecting the charging and discharging of the battery cells.

[0048] In some embodiments, the box body and the box cover can be in various shapes, such as a cuboid or a cylinder. The box body can be a hollow structure with one side open, and the box cover is a plate-like structure. The box cover is covered on the open side of the box body to form an internal accommodation space. In another embodiment, the box body is a hollow structure with one side open, and the box cover is also a hollow structure with one side open, and the open side of the box cover is covered on the open side of the box body to form an internal accommodation space.

[0049] In some embodiments, the battery cells in the box are electrically connected, such as in series, parallel or hybrid, to achieve the required electrical performance parameters of the battery. Hybrid means that multiple battery cells are both in series and in parallel. Adjacent battery cells can be electrically connected via bus bars. Multiple battery cells are arranged in rows, and one or more rows of battery cells can be arranged in the box as needed.

[0050] In some embodiments, the battery cells of the battery can be arranged along at least one of the length direction and the width direction of the box body. At least one row or one column of battery cells can be arranged according to actual needs. If necessary, one or more layers of battery cells can also be arranged in the height direction of the battery.

[0051] In some embodiments, multiple battery cells may be connected in series, parallel or hybrid to form a battery module, and then multiple battery modules are connected in series, parallel or hybrid to form a whole and accommodated in a box. In other embodiments, all battery cells are directly connected in series, parallel or hybrid, and then the whole formed by all battery cells is accommodated in the box.

[0052] In some embodiments, the battery cell may be a secondary battery, which refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0053] The battery cells of the embodiments of the present application may be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, etc., but the embodiments of the present application are not limited to this.

[0054] The battery cells of the embodiments of the present application can be applied to various types of batteries. The battery mentioned here refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0055] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0056] The battery of the embodiment of the present application can be applied to various types of electrical devices using batteries. The electrical device can be a mobile phone, a portable device, a laptop computer, a battery car, an electric car, a ship, a spacecraft, an electric toy and an electric tool, etc. For example, the spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and an electric tool for railways, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator and an electric planer. The present disclosure embodiment does not place any special restrictions on the above-mentioned electrical devices. The battery can be used to power electrical devices such as vehicles, for example, to provide a power source for controlling the vehicle or a power source for driving the vehicle.

[0057] In some embodiments, a battery cell includes an electrode assembly, a housing, and an end cap. The housing has a receiving cavity for receiving the electrode assembly and an open end communicating with the receiving cavity. The end cap covers the open end.

[0058] The electrode assembly may include a first pole piece and a second pole piece with opposite polarities, and also include a separator disposed between the first pole piece and the second pole piece. In some embodiments, the first pole piece is a positive pole piece, and the second pole piece is a negative pole piece. In other embodiments, the first pole piece is a negative pole piece, and the second pole piece is a positive pole piece. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and removed back and forth between the positive pole piece and the negative pole piece. The separator is disposed between the positive pole piece and the negative pole piece, which can prevent the positive and negative poles from short-circuiting, while allowing active ions to pass through.

[0059] In some embodiments, the positive electrode sheet may include a positive current collector substrate and a positive active material layer disposed on at least one surface of the positive current collector substrate.

[0060] As an example, the positive electrode current collector substrate has two surfaces facing each other in its thickness direction, and the positive electrode active material layer is disposed on any one or both of the two facing surfaces of the positive electrode current collector substrate.

[0061] As an example, the positive electrode current collector substrate can be a metal foil or a composite current collector. For example, as the metal foil, aluminum or stainless steel treated with silver surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium can be used.

[0062] As an example, the positive electrode active material layer may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present disclosure is not limited to these materials, and other conventional materials that can be used as positive electrode active material layers of batteries may also be used. These positive electrode active material layers may be used alone or in combination of two or more.

[0063] In some embodiments, the negative electrode sheet may include a negative current collector substrate.

[0064] As an example, the negative electrode current collector substrate can be a metal foil, a foamed metal or a composite current collector. For example, as the metal foil, aluminum or stainless steel treated with silver surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium can be used. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon.

[0065] In some embodiments, the negative electrode sheet may include a negative electrode current collector substrate and a negative electrode active material layer disposed on at least one surface of the negative electrode current collector substrate.

[0066] As an example, the negative electrode current collector substrate has two surfaces facing each other in its thickness direction, and the negative electrode active material layer is disposed on any one or both of the two facing surfaces of the negative electrode current collector substrate.

[0067] As an example, the negative electrode active material layer may adopt the negative electrode active material layer for battery cells known in the art. As an example, the negative electrode active material layer may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present disclosure is not limited to these materials, and other traditional materials that can be used as negative electrode active material layers for batteries may also be used. These negative electrode active material layers may be used alone or in combination of two or more.

[0068] In some embodiments, the material of the positive electrode current collector substrate may be aluminum, and the material of the negative electrode current collector substrate may be copper.

[0069] In some embodiments, the separator is a separator. The present disclosure has no particular limitation on the type of separator, and any known porous separator with good chemical stability and mechanical stability can be selected.

[0070] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a separate component located between the positive electrode sheet and the negative electrode sheet, or it can be located between the positive electrode sheet and the negative electrode sheet and attached to the surface of the positive electrode sheet and / or the surface of the negative electrode sheet.

[0071] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode sheet and the negative electrode sheet and plays the role of transmitting ions and isolating the positive and negative electrodes.

[0072] In some embodiments, the battery cell further includes an electrolyte, which plays a role in conducting ions between the positive and negative electrodes. The present disclosure has no specific restrictions on the type of electrolyte, which can be selected according to needs. The electrolyte can be liquid, gel or solid.

[0073] In some embodiments, the electrode assembly includes a main body. The main body may be a main body of a winding structure formed by winding a positive electrode sheet, a negative electrode sheet, and a separator, or a main body of a stacked structure formed by overlapping a positive electrode sheet, a negative electrode sheet, and a separator. One or more positive electrode sheets and negative electrode sheets may be provided respectively. As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets are alternately provided along the thickness direction of the electrode sheets.

[0074] In some embodiments, the shape of the main body may be cylindrical, flat, or polygonal. The end of the main body may be provided with a first pole ear and a second pole ear. The first pole ear may be formed by cutting or trimming the current collector substrate of the first pole piece, or may be connected to the side of the current collector substrate of the first pole piece by welding. The second pole ear may be formed by cutting or trimming the current collector substrate of the second pole piece, or may be connected to the side of the current collector substrate of the second pole piece by welding.

[0075] For the embodiment in which the first pole piece is a positive pole piece and the second pole piece is a negative pole piece, the first pole piece includes a positive pole piece as a first pole piece, and the second pole piece includes a negative pole piece as a second pole piece. For the embodiment in which the first pole piece is a negative pole piece and the second pole piece is a positive pole piece, the first pole piece includes a negative pole piece as a first pole piece, and the second pole piece includes a positive pole piece as a second pole piece.

[0076] The shell is used to encapsulate the electrode assembly and electrolyte, etc. The shell can be a steel shell, an aluminum shell, a composite metal shell (such as a copper-aluminum composite shell), etc.

[0077] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery.

[0078] When assembling a battery cell, the electrode assembly may be placed in the housing first, and the housing may be filled with electrolyte, and then the end cap may be closed on the open end of the housing to complete the assembly of the battery cell.

[0079] With the increasing demand for low-cost energy storage devices, thick coating to increase battery energy density has become the main way to reduce costs. At the same time, in response to the defects of traditional wet coating, such as cracking of thick pole pieces, severe floating of binders / conductive agents (binder / SP), and difficulty in controlling the thinning area, the industry has been developing solvent-free dry processes and low-solvent quasi-dry processes. The current mainstream dry process route can be described as follows: first, the active main material, conductive agent and binder are pretreated to prepare a fiberized mixture, which is then rolled and formed by a roller pressing device to obtain a self-supporting film, and finally the electrode film and the current collector are hot-pressed to prepare an electrode sheet. The quasi-dry process can be described as follows: first, the prepared agglomerate is extruded to obtain a self-supporting thick film sheet, which is then thinned by a roller pressing mechanism, and finally compounded with the substrate and dried to obtain an electrode sheet.

[0080] Among them, both dry preparation and quasi-dry preparation require that the electrode material be first prepared into granular or diaphragm-like materials, then the current collector is placed between two rollers and a roller gap is set, and finally the material is transferred and adhered to the surface of the current collector by the rolling force generated by the two rollers rotating in opposite directions, thereby obtaining a battery electrode. However, both preparation methods have a drawback, that is, the granular or diaphragm-like materials themselves have elastic and deformation characteristics, and rolling and lateral extension will occur during the transfer process to the current collector, and the edge of the diaphragm will inevitably form irregular wavy edges. If it is not treated before being compounded with the current collector, it is very likely that an edge defective electrode will be obtained, which not only cannot achieve continuous production of electrodes, but also affects the subsequent battery process, and the produced batteries have reliability problems.

[0081] Therefore, it is necessary to cut and shape the area with inconsistent width and thickness of the edge of the diaphragm before the diaphragm is compounded with the current collector, so as to achieve the purpose of preparing battery pole pieces with neat edges and no risk of burrs piercing the diaphragm. On the one hand, in order to prevent the introduction of metal particles during the preparation of the diaphragm and the irreversible damage of the equipment caused by the metal hard cutter, the cutting tool will use a polymer plastic tool with moderate strength. However, this type of tool has the defect of poor wear resistance. The narrower the blade, the worse the wear resistance, so the blade of the cutter will be set wider during tool processing; on the other hand, the material in the dry method / quasi-dry method itself has a certain degree of elastic plasticity. Because of the existence of the above two problems, during the process of cutting and shaping the edge of the diaphragm, the material will be squeezed by the blade of the cutter and forced to flow around the two sides of the cutter, resulting in a thick edge phenomenon. Then the edge thickness will continue to accumulate during the winding process, resulting in a bulging edge of the winding, and in severe cases, it cannot be wound normally. At the same time, the thick edge will cause the edge to be more compacted when the pole piece is rolled, with the risk of rolling edge explosion, reducing the utilization rate of the pole piece. Furthermore, the larger edge thickness will cause the CB value (Cell Balance, which refers to the margin of the negative electrode capacity exceeding the positive electrode capacity in the same stage) to deviate from the design value. The battery cells produced using this electrode sheet are at high risk of edge lithium deposition, which will reduce the battery cell service life and have poor reliability.

[0082] To do this, the edges of the diaphragm need to be cut and shaped.

[0083] Based on the above research, the present application makes structural improvements to the battery pole piece manufacturing device.

[0084] like Figure 1 As shown, in an embodiment of a battery pole piece manufacturing device provided in the present application, the battery pole piece manufacturing device includes a manufacturing component 10 and a shaping device 20, the manufacturing component 10 is configured to manufacture a pole piece 30, the shaping device 20 is arranged downstream of the manufacturing component 10, and the shaping device 20 is configured to reduce the thickness of a preset position of the pole piece 30 manufactured by the manufacturing component 10.

[0085] The preset position may include any position of the pole piece 30 that needs to be thinned, such as an edge or a certain position in the middle of the pole piece 30 .

[0086] By setting the shaping device 20, the thickness of the preset position of the pole piece 30 can be reduced, such as reducing the thickness of the edge of the pole piece 30, eliminating the thick edge, achieving winding without bulging edge, improving the edge neatness of the pole piece 30, and improving the manufacturing quality of the pole piece.

[0087] The shaping device 20 is provided to facilitate the preparation of the electrode 30 without thick edges. When the electrode passes through the rolling process, the edge will not be bright or burst due to excessive edge compression, thereby effectively improving the electrode quality rate. At the same time, the overpressure on the edge will not cause the dynamics to decrease, and the diaphragm will not be pierced after lithium deposition on the edge, thereby improving the reliability of the electrode.

[0088] like Figure 2 and Figure 3 As shown, in some embodiments, the shaping device 20 includes a bracket 21, a support wheel 22 and a pressure wheel 23, and the support wheel 22 and the pressure wheel 23 are both installed on the bracket 21, and there is a first gap a between the pressure wheel 23 and the support wheel 22, so that the thickness of the preset position of the pole piece 30 is reduced when the pole piece 30 passes through the first gap a.

[0089] like Figure 3 As shown, the first gap a is a gap between the outer surface of the support wheel 22 and the outer surface of the pressure wheel 23 in a direction perpendicular to the axis of the support wheel 22 .

[0090] By providing the support wheel 22 and the pressure wheel 23 and forming a first gap a between the pressure wheel 23 and the support wheel 22, the thickness of the pole piece 30 at a preset position can be reduced by squeezing the support wheel 22 and the pressure wheel 23 when the pole piece 30 passes through the first gap a.

[0091] In some embodiments, at least one of the pressure wheel 23 and the support wheel 22 is rotatable relative to the bracket 21 .

[0092] By setting at least one of the pressure wheel 23 and the support wheel 22 to be rotatable relative to the bracket 21, the friction of the pole piece 30 when passing through the first gap a can be reduced, thereby avoiding the surface of the pole piece 30 from being worn, and effectively ensuring the quality of the pole piece 30; at the same time, it can also prevent the pole piece 30 from getting stuck due to the large friction force, thereby affecting the manufacturing efficiency.

[0093] In some embodiments, the size of the first gap a decreases along the axis of the pressing wheel 23 .

[0094] By setting the size of the first gap a to decrease along the axis of the pressing wheel 23, the thickness of the pole piece 30 can be reduced along the axis of the pressing wheel 23 after passing through the first gap a. Compared with the solution in which the size of the first gap a along the axis of the pressing wheel 23 remains unchanged, the embodiment of the present application sets the size of the first gap a to decrease along the axis of the pressing wheel 23, which can meet different thickness requirements.

[0095] The size of the first gap a decreases along the axis of the pressing wheel 23 , including the size of the first gap a decreasing in a step-like manner along the axis of the pressing wheel 23 , and the size of the first gap a gradually decreasing along the axis of the pressing wheel 23 .

[0096] In some embodiments, the size of the first gap a gradually decreases along the axis of the pressing wheel 23 .

[0097] The size of the first gap a is set to gradually decrease along the axis of the pressing wheel 23, so that the thickness of the pole piece 30 can gradually decrease along the axis of the pressing wheel 23 after passing through the first gap a, so that the thickness of the pole piece 30 can achieve a smooth transition and avoid sudden thickness changes.

[0098] In some embodiments, the size of the first gap a first decreases and then increases along the axis of the pressing wheel 23 .

[0099] By setting the size of the first gap a to first decrease and then increase along the axis of the pressing wheel 23, the thickness of the pole piece 30 can be first decreased and then increased along the axis of the pressing wheel 23 after passing through the first gap a. Compared with the solution in which the size of the first gap a along the axis of the pressing wheel 23 remains unchanged, the embodiment of the present application sets the size of the first gap a to first decrease and then increase along the axis of the pressing wheel 23, which can meet different thickness requirements.

[0100] Setting the size of the first gap a to first decrease and then increase along the axis of the pressing wheel 23 also has the advantage that the pole piece 30 can be thinned on both sides of the pressing wheel 23 with the maximum diameter of the pressing wheel 23 as the dividing line. When both side edges of the same pole piece 30 need to be thinned by the same pressing wheel 23, the thinned side can be replaced by moving the lateral position of the pole piece 30 without turning or flipping the pole piece 30.

[0101] The size of the first gap a first decreases and then increases along the axis of the pressing wheel 23, including the first gap a first decreases in a step-like manner and then increases in a step-like manner along the axis of the pressing wheel 23, and the first gap a first gradually decreases and then gradually increases along the axis of the pressing wheel 23.

[0102] In some embodiments, the size of the first gap a gradually decreases and then gradually increases along the axis of the pressing wheel 23 .

[0103] The size of the first gap a is set to gradually decrease and then gradually increase along the axis of the pressure wheel 23. After passing through the first gap a, the thickness of the pole piece 30 can first gradually decrease and then gradually increase along the axis of the pressure wheel 23, so that the thickness of the pole piece 30 can achieve a smooth transition and avoid sudden thickness changes.

[0104] In order to change the size of the first gap a according to some of the aforementioned embodiments, many methods can be used, such as adjusting the diameter of the pressure wheel 23, adjusting the diameter of the support wheel 22, or adjusting the diameters of the pressure wheel 23 and the support wheel 22 at the same time.

[0105] In some embodiments, the diameter of the pressure wheel 23 increases along its axial direction or increases first and then decreases.

[0106] By setting the diameter of the pressure wheel 23 to increase along its axial direction or first increase and then decrease, when the diameter of the support wheel 22 remains unchanged, the size of the first gap a can be increased along the axis of the pressure wheel 23 or first decrease and then increase, thereby achieving the adjustment of the size of the first gap a.

[0107] By changing the diameter of the pressure wheel 23 to adjust the size of the first gap a, the diameter of the support wheel 22 can be kept unchanged, the structural changes to the support wheel 22 can be reduced, and the manufacturing difficulty of the support wheel 22 can be reduced.

[0108] In some embodiments, the diameter of the pressing wheel 23 gradually increases along its axis or first increases gradually and then decreases gradually. In this way, the size of the first gap a can be reduced along the axis of the pressing wheel 23 or first decreases gradually and then increases gradually.

[0109] like Figure 4 and Figure 5 As shown, in some embodiments, the outer edge of the cross section of the pressure wheel 23 passing through its axis includes an arc portion. By providing the arc portion, the diameter of the pressure wheel 23 can be gradually transitioned along its axis direction, thereby achieving a gradual transition in the size of the first gap a and a gradual transition in the thickness of the pole piece 30, thereby avoiding a sudden change in thickness.

[0110] In some embodiments, the arc height h of the arc portion is greater than 0 mm and less than or equal to 1 mm. For example, h can be 0.05 mm, 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm or 1 mm.

[0111] In some embodiments, the arc height h of the arc portion is 0.05 mm to 0.25 mm.

[0112] The arc height h can be understood as the difference between the maximum radius and the minimum radius of the pressure wheel 23.

[0113] The maximum diameter of the pressing wheel 23 is in the range of 20 to 150 mm, preferably 25 to 50 mm. The minimum diameter of the pressing wheel 23 is in the range of 20 to 150 mm, preferably 20 to 45 mm. The axial length of the pressing wheel 23 is in the range of 10 to 80 mm, preferably 20 to 50 mm.

[0114] In some embodiments, the size of the first gap a is adjustable.

[0115] By setting the size of the first gap a to be adjustable, the size of the first gap a can be flexibly adjusted according to actual needs to meet the different thickness requirements of different pole pieces 30, and the problem of uncontrollable thinning amount caused by uncontrollable downward pressure of the pressure wheel 23 can also be solved.

[0116] There are many options for adjusting the size of the first gap a.

[0117] In some embodiments, the shaping device 20 further includes a first adjusting mechanism 24, which is drivingly connected to the pressing wheel 23, and the first adjusting mechanism 24 is configured to drive the pressing wheel 23 to move relative to the supporting wheel 22 to adjust the size of the first gap a.

[0118] By providing the first adjusting mechanism 24 , the size of the first gap a can be adjusted by driving the pressure wheel 23 to move relative to the support wheel 22 .

[0119] The specific structure of the first adjustment mechanism 24 can be flexibly set.

[0120] like Figure 2 As shown, the first adjustment mechanism 24 includes a first driving device 241 and a mounting frame 242. The first driving device 241 is connected to the bracket 21, and the pressure wheel 23 is installed on the mounting frame 242. The first driving device 241 drives the mounting frame 242 to move relative to the bracket 21, driving the pressure wheel 23 to approach or move away from the supporting wheel 22, thereby adjusting the size of the first gap a.

[0121] The first driving device 241 can be a driving member such as an oil cylinder, an air cylinder or a motor.

[0122] In some embodiments, the shaping device 20 also includes a detection device and a control device. The detection device is configured to detect the thickness of the pole piece 30 after passing through the first gap a. The control device is signal-connected to the detection device and the first adjustment mechanism 24. The control device is configured to control the action of the first adjustment mechanism 24 according to the detection result of the detection device.

[0123] The detection device can adopt a laser thickness measuring device. After the edge pressing and shaping by the shaping device 20, the pole piece 30 will enter the laser thickness measuring device for online thickness measurement. The measurement data is fed back to the control device, and then the control device controls the moving distance of the first driving device 241 to realize online closed-loop controllable adjustment of the edge pressing and shaping of the pole piece 30, thereby saving labor cost and time cost. It has flexibility and universality in practical applications, which greatly promotes the large-scale mass production of dry / quasi-dry pole pieces, thereby increasing the production efficiency of the enterprise.

[0124] The first driving device 241 may adopt a voice coil motor, which can achieve precise movement to a set position in the vertical direction, thereby precisely controlling the downward pressure amount.

[0125] The control device can be a general-purpose processor, a programmable logic controller (PLC), a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or any appropriate combination thereof for performing the functions described in the present disclosure.

[0126] In some embodiments, the shaping device 20 includes a plurality of pressing wheels 23 , which are arranged in a direction parallel to the axis of the supporting wheel 22 .

[0127] By arranging a plurality of pressing wheels 23 in a direction parallel to the axis of the supporting wheel 22 , it is possible to simultaneously thin a plurality of pole pieces 30 , thereby effectively improving the thinning efficiency.

[0128] When preparing battery electrodes, a production method of one electrode out of multiple electrodes is usually adopted, which means that multiple cutters are used to cut the edge materials and the blank area. As a result, multiple cut edges will have thick edge problems. At this time, multiple sets of pressure wheels 23 are used to work together to meet the needs of rolling up multiple electrodes without bulging edges, which is suitable for the preparation of multiple electrodes out of one.

[0129] In some embodiments, there is a second gap b between two adjacent pressing wheels 23, and the size of the second gap b is adjustable.

[0130] like Figure 3 As shown, the second gap b is the distance between the centers of two adjacent pressing wheels 23 .

[0131] By setting the size of the second gap b to be adjustable, it is possible to accommodate different widths of the pole pieces 30 whose different sides are thinned by the two pressing wheels 23 , or to accommodate different distances between two pole pieces 30 whose different pole pieces 30 are thinned by the two pressing wheels 23 .

[0132] There are many options for adjusting the size of the second gap b.

[0133] In some embodiments, the shaping device 20 also includes a second adjustment mechanism 25, which is disposed on the bracket 21, and the pressure wheel 23 is installed on the second adjustment mechanism 25. The second adjustment mechanism 25 is configured to drive the pressure wheel 23 to move relative to the bracket 21 in a direction parallel to the axis of the support wheel 22 to adjust the size of the second gap b.

[0134] By providing the second adjustment mechanism 25 , the pressing wheel 23 can be driven to move relative to the bracket 21 in a direction parallel to the axis of the supporting wheel 22 , thereby adjusting the distance between the two pressing wheels 23 , that is, adjusting the size of the second gap b.

[0135] The specific structure of the second adjustment mechanism 25 can be flexibly set.

[0136] In some embodiments, the second adjustment mechanism 25 includes a guide rail 251 arranged on the bracket 21, a slider 252 cooperating with the guide rail 251, and a second driving device 253, the second driving device 253 is configured to drive the slider 252 to slide along the guide rail 251, and the pressure wheel 23 is installed on the slider 252.

[0137] Through the second driving device 253, the slider 252 can be driven to slide along the guide rail 251, thereby driving the pressure wheel 23 installed on the slider 252 to move relative to the bracket 21, thereby adjusting the lateral position of the pressure wheel 23, that is, adjusting the size of the second gap b between the two pressure wheels 23.

[0138] The guide rail 251 may be provided with a magnetic scale, a magnetic scale reader, an origin, and a positive and negative limit photoelectric switch, and a sensor sheet may be provided on the slider 252. The relative position of the slider 252 at a certain moment can be read through the origin, the magnetic scale, and the magnetic scale reader, so that the second drive device 253 can be accurately moved to the set position in the horizontal direction, and it is also convenient to realize the visual monitoring of the position of the pressure wheel 23. The positive and negative limit photoelectric switches can limit the moving position of the slider 252 to prevent the slider 252 from leaving the guide rail 251 or colliding with other components.

[0139] In some embodiments, the sizes of the first gaps a between the plurality of pressing wheels 23 and the supporting wheel 22 can be adjusted independently.

[0140] By making the sizes of the first gaps a between the plurality of pressing wheels 23 and the support wheel 22 independently adjustable, the size of the first gap a between each pressing wheel 23 and the support wheel 22 can be independently adjusted to meet different thinning requirements of different pole pieces 30 .

[0141] In some embodiments, the shaping device 20 further includes a mounting shaft 26 and a gasket 27 . The mounting shaft 26 is disposed on the bracket 21 . A plurality of pressure wheels 23 are mounted on the mounting shaft 26 . The gasket 27 is disposed between two adjacent pressure wheels 23 located on the same mounting shaft 26 .

[0142] By providing the mounting shaft 26, multiple pressing wheels 23 can be provided on the same mounting shaft 26, so as to facilitate simultaneous thinning of multiple pole pieces 30. Moreover, when adjusting by the second adjusting mechanism 25, the lateral positions of multiple pressing wheels 23 on the same mounting shaft 26 can be adjusted simultaneously, thereby reducing the number of the second adjusting mechanisms 25 and reducing the cost.

[0143] By providing a gasket 27 between two adjacent pressure wheels 23 located on the same mounting shaft 26 , the distance between the two adjacent pressure wheels 23 can be adjusted by adjusting the thickness of the gasket 27 or the number of the gaskets 27 to accommodate different widths of the pole pieces 30 .

[0144] By setting the gasket 27, multiple pole pieces 30 can be simultaneously pressed and shaped in a simple and convenient manner according to product production requirements. At the same time, on-site staff can adjust the thickness or quantity of the gasket 27 according to requirements to be compatible with different preset blank widths of the intermediate membrane area. The process is simple to operate, takes a short time, effectively improves the production efficiency of the pole pieces, and has high flexibility and compatibility.

[0145] In some embodiments, the shaping device 20 further includes a third adjustment mechanism 28 , which is configured to adjust the angle between the axis of the pressing wheel 23 and the axis of the supporting wheel 22 .

[0146] By setting the third adjustment mechanism 28, the angle between the axis of the pressure wheel 23 and the axis of the support wheel 22 can be adjusted. For example, when the angle is 0°, the axis of the pressure wheel 23 is parallel to the axis of the support wheel 22, which is convenient for controlling the size of the first gap a.

[0147] By setting the third adjustment mechanism 28, it is possible to avoid the situation where the two pressure wheels 23 on the same mounting shaft 26 have inconsistent heights, and to avoid the problem of inconsistent downward pressure when the first adjustment mechanism 24 is adjusted, which leads to uncontrollable edge thinning.

[0148] There are many options for the specific structure of the third adjustment mechanism 28. For example, the third adjustment mechanism 28 can adopt a disc-type precision angle slide to adjust the angle between the axis of the pressing wheel 23 and the axis of the supporting wheel 22 so that the axis of the pressing wheel 23 and the axis of the supporting wheel 22 remain parallel as much as possible.

[0149] In some embodiments, the roughness of the outer circumference of the pressing wheel 23 is 0.01-0.5. For example, the roughness may be 0.01, 0.02, 0.03, 0.04, 0.05, 0.1, 0.2, 0.3, 0.4 or 0.5.

[0150] In some embodiments, the roughness of the outer circumferential surface of the pressing wheel 23 is 0.05-0.2.

[0151] In some embodiments, the material of the pressure wheel 23 can be a metal or alloy material that does not contain copper or zinc, or a synthetic polymer material, such as synthetic plastic, synthetic rubber, and synthetic fiber. Specifically, it mainly includes plastics such as polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyvinyl alcohol, polyvinylidene chloride, polyvinyl fluoride, polyvinylidene fluoride, polytetrafluoroethylene, chlorinated polyether, polyaniline, polypyrrole, acrylonitrile-styrene copolymer, acrylonitrile-butadiene-styrene copolymer, etc.; engineering plastics such as polyamide, polycarbonate, polyformaldehyde, polyimide, polysulfone, polyphenylene ether, polyphenylene sulfide, polyester, polyaryletherketone, etc.; fiber-reinforced plastics such as carbon fiber reinforced plastic, glass fiber reinforced plastic, and aramid fiber reinforced plastic, etc.; synthetic rubbers such as butyl rubber, nitrile rubber, styrene-butadiene rubber, chlorinated nitrile rubber, EPDM rubber, chloroprene rubber, fluororubber, chlorosulfonated polyethylene rubber, silicone rubber, etc.

[0152] The battery pole piece manufacturing device embodiment provided in the present application has strong universality and is applicable to all material systems for preparing battery pole pieces using dry / quasi-dry pole piece process routes. Among them, the active material used to prepare the positive pole piece is a mixture of one or more of the following materials: lithium-containing phosphates with olivine structure; lithium transition metal oxides such as lithium nickel cobalt manganese oxide, lithium cobalt oxide, lithium manganese oxide and lithium nickel cobalt aluminum oxide and their modified compounds. The material used to prepare the negative pole piece is a mixture of one or more of the following materials: carbon materials such as natural graphite, artificial graphite, mesophase carbon microspheres, hard carbon, soft carbon; silicon materials such as silicon oxide, silicon nanowires, composite silicon carbon; metallic lithium and its alloy materials, etc. However, the application scenarios of the present application are not limited to the preparation of lithium-ion battery pole pieces, but are also applicable to the preparation scenarios of new batteries such as sodium-ion batteries and solid-state batteries.

[0153] In some embodiments, the pressure wheel 23 may adopt a double-layer structure, and the pressure wheel 23 includes an inner ring and an outer ring, the inner ring is connected to the mounting shaft 26, and the outer ring contacts the pole piece 30. The inner ring and the outer ring are connected by a bearing so that the outer ring can rotate relative to the inner ring.

[0154] By setting the bearing, the movement of the pole piece 30 can drive the outer ring of the pressure wheel 23 to roll relative to the pole piece 30, and the sliding friction between the outer ring and the pole piece 30 is converted into rolling friction, which effectively reduces the friction force, avoids the pole piece 30 from being crushed, and effectively improves the manufacturing quality of the pole piece 30.

[0155] Based on the battery pole piece manufacturing device in each of the above-mentioned embodiments, the present application also provides a battery manufacturing equipment, which includes the above-mentioned battery pole piece manufacturing device.

[0156] The following is combined with Figures 1 to 5 , the structure and working process of an embodiment of the battery pole piece manufacturing device provided in this application are described.

[0157] like Figure 1 As shown, the battery pole piece manufacturing device includes a manufacturing assembly 10 and a shaping device 20. The shaping device 20 is located downstream of the manufacturing assembly 10.

[0158] The manufacturing assembly 10 includes a first roller 11 , a second roller 12 , a third roller 13 , a fourth roller 14 , a cutter device 15 , a material guide device 16 , and a current collector 17 .

[0159] The diameter of the first roller 11 is larger than the diameter of the second roller 12. The diameters of the third roller 13 and the fourth roller 14 are substantially equal. The diameters of the third roller 13 and the fourth roller 14 are larger than the diameters of the first roller 11 and the second roller 12. The centers of the first roller 11, the second roller 12, the third roller 13 and the fourth roller 14 are collinear.

[0160] Among them, the first roller 11 is a support roller, and its function is to prevent the second roller 12 from deforming. The extruded thick film sheet involved in the quasi-dry process or the fibrous material involved in the dry process is squeezed by the second roller 12 and the third roller 13 to obtain a thinned film of a certain thickness. The thinned film sheet material adheres to the surface of the third roller 13 and is then transferred to the fourth roller 14. Under the rolling action of the third roller 13 and the fourth roller 14, it is compounded with the current collector 17. The formed film sheet prepared by the quasi-dry process moves to the oven with the fourth roller 14 to remove the solvent and then roll it up. The formed electrode sheet prepared by the dry process can be directly rolled up.

[0161] The edge of the membrane obtained after thinning by the second roller 12 and the third roller 13 has irregular wavy edges, so a cutter device 15 and a material guide device 16 are installed on the fixed frame below the third roller 13. The cutter device 15 cuts off the irregular edge materials and the blank area corresponding to the membrane on both sides, and then the material guide device 16 peels the edge materials off the roller surface of the third roller 13. When a cutter made of polymer material is used to cut the membrane, the cutting edge squeezes the material, resulting in redundant and thick edges at the cutting edge, which leads to a series of process and reliability problems, such as winding drum edge, cold pressing edge burst, edge lithium precipitation, etc. Therefore, after the membrane is transferred and composited to the current collector 17, it needs to be slightly rolled by the shaping device 20 to prepare an electrode sheet with neat edges and near-zero edge thinning, thereby improving the energy density of the battery.

[0162] The shaping device 20 can slightly roll and shape the thick edge produced by the redundant material during the cutting process of the cutter to eliminate the thick edge, thereby achieving the preparation of the electrode sheet with neat edges and near zero thinning, and winding without bulging edges.

[0163] During the preparation of dry / quasi-dry electrode sheets, there is a thick edge within 2 mm of the edge of the electrode sheet 30 due to the cutting and trimming of the membrane. The shaping device 20 can press and shape the raised portion of the thick edge within this range to ensure that the thinning is within the specification range and there is no bulging edge when rolled up.

[0164] like Figure 2 and Figure 3 As shown, the shaping device 20 includes a bracket 21, a supporting wheel 22, a pressing wheel 23, a first adjusting mechanism 24, a second adjusting mechanism 25, a mounting shaft 26, a gasket 27 and a third adjusting mechanism 28.

[0165] The bracket 21 includes two first mounting plates 211 , a second mounting plate 212 and a support shaft. The two first mounting plates 211 are arranged vertically, and the second mounting plate 212 and the support shaft are connected between the two first mounting plates 211 .

[0166] The supporting wheel 22 is sleeved on the supporting shaft.

[0167] The first adjusting mechanism 24 includes a first driving device 241 and a mounting frame 242. The second adjusting mechanism 25 includes a guide rail 251, a slider 252 and a second driving device 253.

[0168] The guide rail 251 is disposed on the second mounting plate 212 . The second driving device 253 is connected between the guide rail 251 and the slider 252 . The slider 252 is slidably matched with the guide rail 251 .

[0169] The slider 252 includes a first vertical plate, a cross plate and a second vertical plate, and the cross plate is connected between the first vertical plate and the second vertical plate. The length of the first vertical plate is less than that of the second vertical plate, and the first vertical plate is inserted into the guide rail 251. The first driving device 241 is installed on the second vertical plate. The first driving device 241 is drivingly connected to the mounting frame 242, and the mounting frame 242 is equipped with a mounting shaft 26, and one or more pressure wheels 23 can be installed on the mounting shaft 26. A gasket 27 is provided between two pressure wheels 23 on the mounting shaft 26. The mounting frame 242 is also equipped with a third adjustment mechanism 28, and the parallelism between the axis of the pressure wheel 23 and the axis of the support wheel 22 can be adjusted by the third adjustment mechanism 28.

[0170] In such Figure 2 and 3 In the illustrated embodiment, four sliders 252 are provided on the guide rail 251. A first adjustment mechanism 24 and a mounting shaft 26 are mounted on each slider 252. Among the mounting shafts 26 mounted on the four sliders 252, two mounting shafts 26 are respectively provided with a pressing wheel 23, and the other two mounting shafts 26 are each provided with two pressing wheels 23. This configuration can simultaneously thin the three pole pieces 30.

[0171] like Figure 4 and Figure 5 As shown, the diameter of the pressing wheel 23 gradually increases and then gradually decreases along the axial direction, so that the thickness of the pole piece 30 can be gradually transitioned. For example, the edge of the pole piece 30 is gradually thickened from the outside to the inside.

[0172] An embodiment of a battery pole sheet manufacturing device provided in the present application includes a shaping device, which is arranged after the membrane is transferred from the roller surface to the current collector. The shaping device can slightly press and shape the thick edge produced by cutting with a cutter, thereby continuously producing battery pole sheets with no thick edges, and directly use them for subsequent battery cell preparation.

[0173] The battery pole piece manufacturing device embodiment provided in the present application is suitable for dry / quasi-dry process, and can slightly roll and shape the thick edge redundant material produced after cutting with a cutter, thereby improving abnormal phenomena such as winding bulging edge and cold pressing burst edge caused by the large edge thickness of the pole piece, so as to achieve the effect of no thick edge and no bulging edge when winding, realize the continuous production of battery pole pieces, and improve the process capability of the pole pieces; at the same time, prepare electrode sheets with neat edges and near zero thinning, reduce the risk of lithium deposition at the edge of the battery cell and piercing the diaphragm, and improve product quality and service life.

[0174] The battery pole piece manufacturing device embodiment provided in the present application can control the downward pressure of the pressing wheel through the first adjustment mechanism, thereby preparing pole pieces with near-zero edge thinning, greatly improving the product quality of the electrode pieces.

[0175] The battery pole piece manufacturing device embodiment provided in the present application can adjust the distance between two adjacent pressing wheels through the second adjustment mechanism to adapt to different pole piece widths and different sizes of blank areas, and has strong dimensional compatibility. By adjusting the position of the pressing wheel, the distance between the transfer wheels can be changed to match the design size specifications of different products.

[0176] In the embodiment of the battery pole piece manufacturing device provided in the present application, the gap between the two pressure wheels located on the same mounting axis can also be adjusted, and the parallelism of the axes of the pressure wheels and the support wheels can also be fine-tuned, thereby effectively improving the accuracy of the manufacturing device.

[0177] The embodiment provided in the present application can accommodate the simultaneous edge shaping of multiple pole pieces by adjusting the number of the first adjustment mechanism, the second adjustment mechanism and the pressing wheel, so as to be used for the preparation of multiple pole pieces.

[0178] The above description of various embodiments tends to emphasize the differences between the various embodiments. The same or similar aspects can be referenced to each other, and for the sake of brevity, they will not be repeated herein.

[0179] Those skilled in the art will appreciate that, in the above method of a specific embodiment, the order in which the steps are written does not imply a strict execution order and does not constitute any limitation on the implementation process. The specific execution order of the steps should be determined by their functions and possible internal logic.

[0180] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery pole piece manufacturing device, characterized in that: include: A manufacturing assembly (10) configured to manufacture a pole piece (30); and a shaping device (20), arranged downstream of the manufacturing assembly (10), the shaping device (20) being configured to reduce the thickness of a preset position of the pole piece (30) manufactured by the manufacturing assembly (10); The shaping device (20) comprises a bracket (21), a support wheel (22) and a pressure wheel (23); the support wheel (22) and the pressure wheel (23) are both mounted on the bracket (21); a first gap (a) is provided between the pressure wheel (23) and the support wheel (22), so that the thickness of the pole piece (30) at a preset position is reduced when the pole piece (30) passes through the first gap (a).

2. The battery pole piece manufacturing device according to claim 1, characterized in that: The pressure wheel (23) and / or the support wheel (22) are rotatable relative to the bracket (21).

3. The battery pole piece manufacturing device according to claim 1, characterized in that: The size of the first gap (a) decreases along the axis of the pressure wheel (23).

4. The battery pole piece manufacturing device according to claim 1, characterized in that: The size of the first gap (a) first decreases and then increases along the axis of the pressing wheel (23).

5. The battery pole piece manufacturing device according to claim 1, characterized in that: The diameter of the pressing wheel (23) increases along its axial direction or first increases and then decreases.

6. The battery pole piece manufacturing device according to claim 1, characterized in that: The outer edge of the cross section of the pressing wheel (23) passing through its axis comprises an arc-shaped portion.

7. The battery pole piece manufacturing device according to claim 6, characterized in that: The arc height of the arc portion is greater than 0 mm and less than or equal to 1 mm.

8. The battery pole piece manufacturing device according to claim 1, characterized in that: The size of the first gap (a) is adjustable.

9. The battery pole piece manufacturing device according to claim 1, characterized in that: The shaping device (20) further comprises a first adjustment mechanism (24), the first adjustment mechanism (24) being drivingly connected to the pressing wheel (23), the first adjustment mechanism (24) being configured to drive the pressing wheel (23) to move relative to the supporting wheel (22) so as to adjust the size of the first gap (a).

10. The battery pole piece manufacturing device according to claim 9, characterized in that: The shaping device (20) further comprises a detection device and a control device, wherein the detection device is configured to detect the thickness of the pole piece (30) after passing through the first gap (a), the control device is connected to the detection device and the first adjustment mechanism (24) by signals, and the control device is configured to control the action of the first adjustment mechanism (24) according to the detection result of the detection device.

11. The battery pole piece manufacturing device according to claim 1, characterized in that: The shaping device (20) comprises a plurality of pressing wheels (23), wherein the plurality of pressing wheels (23) are arranged in a direction parallel to the axis of the supporting wheel (22).

12. The battery pole piece manufacturing device according to claim 11, characterized in that: There is a second gap (b) between two adjacent pressing wheels (23), and the size of the second gap (b) is adjustable.

13. The battery pole piece manufacturing device according to claim 12, characterized in that: The shaping device (20) further comprises a second adjusting mechanism (25), wherein the second adjusting mechanism (25) is arranged on the bracket (21), and the pressing wheel (23) is mounted on the second adjusting mechanism (25), and the second adjusting mechanism (25) is configured to drive the pressing wheel (23) to move relative to the bracket (21) along a direction parallel to the axis of the supporting wheel (22) so as to adjust the size of the second gap (b).

14. The battery pole piece manufacturing device according to claim 13, characterized in that: The second adjustment mechanism (25) comprises a guide rail (251) arranged on the bracket (21), a slider (252) cooperating with the guide rail (251), and a second driving device (253), wherein the second driving device (253) is configured to drive the slider (252) to slide along the guide rail (251), and the pressure wheel (23) is mounted on the slider (252).

15. The battery pole piece manufacturing device according to claim 11, characterized in that: The sizes of the first gaps (a) between the plurality of pressing wheels (23) and the supporting wheels (22) can be adjusted independently.

16. The battery pole piece manufacturing device according to claim 11, characterized in that: The shaping device (20) further comprises a mounting shaft (26) and a gasket (27); the mounting shaft (26) is arranged on the bracket (21); a plurality of pressing wheels (23) are mounted on the mounting shaft (26); and the gasket (27) is arranged between two adjacent pressing wheels (23) located on the same mounting shaft (26).

17. The battery pole piece manufacturing device according to claim 1, characterized in that: The shaping device (20) further comprises a third adjustment mechanism (28), wherein the third adjustment mechanism (28) is configured to adjust the angle between the axis of the pressing wheel (23) and the axis of the supporting wheel (22).

18. The battery pole piece manufacturing device according to claim 1, characterized in that: The roughness of the outer peripheral surface of the pressing wheel (23) is 0.01-0.

5.

19. A battery manufacturing device, characterized in that: It comprises a battery pole piece manufacturing device as described in any one of claims 1 to 18.

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