Pole piece preparation device and pole piece

Abstract

The embodiment of the utility model discloses a pole piece preparation device and a pole piece, and belongs to the technical field of preparation of lithium ion batteries. The pole piece preparation device comprises a coating assembly and a magnetizing assembly. In the conveying direction of the base material, the coating assembly is located on the upstream of the magnetizing assembly, the coating assembly is used for coating the coating face of the base material with slurry, and the magnetizing assembly is used for magnetizing particles in the slurry so as to change the arrangement direction of the particles in the slurry. On the basis of ensuring the production efficiency of the pole piece, the arrangement direction of the particles in the slurry on the base material can be changed, so that the diffusion effect of lithium ions is ensured, and the performance of the lithium ion battery is improved.

Description

Technical Field

[0001] This application relates to the technical field of the preparation of lithium-ion batteries, and particularly to a pole piece preparation device and a pole piece. Background Art

[0002] Coating is to uniformly, continuously or intermittently coat a prepared paste-like viscous slurry on a substrate such as a current collector. At the same time, the solvent in the slurry laid flat on the current collector is removed by drying and heating, so that the solid substances are well adhered to the substrate to form a positive pole piece strip or a negative pole piece strip of a lithium-ion battery.

[0003] Graphite is generally used as the negative electrode active material in lithium-ion batteries. However, in related technologies, for the electrode structure, it is often only possible to let it bake and form naturally, lacking means to control the particle orientation. Summary of the Utility Model

[0004] In view of the above problems, this application provides a pole piece preparation device and a pole piece, which can change the arrangement direction of the particles in the slurry on the substrate on the basis of ensuring the production efficiency of the pole piece, thereby ensuring the diffusion effect of lithium ions and improving the performance of the lithium-ion battery.

[0005] To achieve the above object, this application provides the following technical solutions:

[0006] In the first aspect of the embodiments of this application, a pole piece preparation device is provided, including a coating component and a magnetization component; along the transmission direction of the substrate, the coating component is located upstream of the magnetization component, the coating component is used to coat the slurry on the coating surface of the substrate, and the magnetization component is used to magnetize the particles in the slurry to change the arrangement direction of the particles in the slurry.

[0007] In an implementable embodiment, it further includes a transmission component and a baking component; the transmission component is used to transmit the substrate and drive the substrate to move along the transmission direction; the baking component is close to the discharge end of the transmission component, and the baking component is used to bake the substrate coated with the slurry.

[0008] In an implementable embodiment, the magnetization component includes a first magnetization member and a second magnetization member; the first magnetization member is located outside the baking component, and is located between the baking component and the coating component and is spaced apart from the coating surface of the substrate, and the second magnetization member is located inside the baking component and is spaced apart from the coating surface of the substrate.

[0009] In an implementable embodiment, the number of the magnetization assemblies is plural; along the thickness direction of the substrate, the plural magnetization assemblies are respectively disposed on opposite sides close to the substrate; or, the plural magnetization assemblies are disposed on one side close to the lower surface of the substrate; or, the plural magnetization assemblies are disposed on one side close to the upper surface of the substrate.

[0010] In an implementable embodiment, the baking assembly includes a first baking cavity and a second baking cavity that are in communication with each other, and the second baking cavity is located on one side of the first baking cavity close to the discharge end of the transfer assembly; the second magnetization member is disposed in the first baking cavity and is spaced apart from the coating surface of the substrate.

[0011] In an implementable embodiment, a plurality of blowing assemblies are spaced apart in the baking assembly, the blowing assembly has a blowing port, the blowing port faces the coating surface of the substrate, and the blowing assembly and the magnetization assembly are arranged in a dislocation manner with respect to the thickness direction of the substrate.

[0012] In an implementable embodiment, the blowing assembly includes an upper blowing member and a lower blowing member, along the thickness direction of the substrate, the upper blowing member and the lower blowing member are disposed on opposite sides of the baking assembly, the upper blowing member and the lower blowing member respectively have the blowing port; the magnetization assembly and the upper blowing member are arranged in a dislocation manner with respect to the thickness direction of the substrate; and / or, the magnetization assembly and the lower blowing member are arranged in a dislocation manner with respect to the thickness direction of the substrate; and / or, the upper blowing member and the lower blowing member are arranged in a dislocation manner with respect to the thickness direction of the substrate.

[0013] In an implementable embodiment, a lifting member is further included, the lifting member is connected to the magnetization assembly, and the lifting member is used to drive the lifting of the magnetization assembly; the pole piece preparation device further includes a translation member, the translation member is connected to the magnetization assembly, and the translation member is used to drive the translation of the magnetization assembly.

[0014] In an implementable embodiment, an angle adjustment member is further included, and the angle adjustment member is used to adjust the angle between the magnetization assembly and the substrate plane. In an implementable embodiment, a power supply member is further included, the power supply member is electrically connected to the lifting member and the translation member respectively, and the power supply member is used to supply power to the lifting member and the translation member; the pole piece preparation device further includes a control member, the control member is electrically connected to the lifting member and the translation member respectively, and the control member is used to control the lifting of the lifting member and the translation of the translation member.

[0015] In an implementable embodiment, it further includes a magnetic induction component, the magnetic induction component is arranged on the magnetization component, the magnetic induction component is electrically connected to the control component, and the magnetic induction component is used to sense the magnetic field intensity value of the magnetization component and send the magnetic field intensity value to the control component; and / or, the pole piece preparation device further includes a magnetic isolation protection component, and the magnetic isolation protection component is arranged on the magnetization component.

[0016] In an implementable embodiment, along the thickness direction of the substrate, the distance between the magnetization component and the surface of the substrate is not greater than 2 mm; and / or, the length of the baking component is 2 times the length of the substrate moving along the preset speed within the preset time.

[0017] In an implementable embodiment, the first magnetization component is a permanent magnet or an electromagnet, the magnetic field intensity range of the first magnetization component is between 0.4 T and 2 T, the magnetic field width range of the first magnetization component is between 150 mm and 1500 mm, and the magnetic field length range of the first magnetization component is M / 5n; and / or, the second magnetization component is a permanent magnet, the magnetic field intensity range of the second magnetization component is between 0.4 T and 2 T, the magnetic field width range of the second magnetization component is between 150 mm and 1500 mm, and the magnetic field length of the second magnetization component is M / 5n; where M is the moving speed of the substrate, the unit is m / min, and n is the number of magnetization components.

[0018] A second aspect of the embodiments of the present application provides a pole piece, and the pole piece is prepared by using a pole piece preparation device.

[0019] The embodiments of the present application provide a pole piece preparation device and a pole piece. By including a coating component, it can supply the slurry and achieve the coating on the coating surface of the substrate; by including a magnetization component, the magnetization component is located downstream of the coating component. In this way, it helps to magnetize the particles in the slurry on the substrate after coating the slurry, thereby benefiting to extend the magnetization path of the particles in the slurry, increase the magnetization area of the particles in the slurry, and further benefit to change the arrangement direction of the particles in the slurry on the substrate to the greatest extent, ensure that the plane of the particles in the slurry is perpendicular to the plane of the substrate, and benefit to significantly improve the consistency of the arrangement of the particle plane in the direction perpendicular to the plane of the substrate. Thus, on the basis of ensuring the production efficiency of the pole piece, it can ensure the diffusion effect of lithium ions, reduce the resistivity and battery internal resistance, improve the charging ability, slow down the battery deterioration, and thus maximize the low-temperature, rate, and cycle performance of the lithium-ion battery. Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of the pole piece preparation device provided by the embodiments of the present application;

[0021] Figure 2The top view of the pole piece preparation device provided by the embodiment of the present application;

[0022] Figure 3 The structural schematic diagram of the distance between the magnetization component and the surface of the base material provided by the embodiment of the present application;

[0023] Figure 4 The process flow chart of the pole piece preparation method provided by the embodiment of the present application.

[0024] Explanation of reference numerals:

[0025] 100 - Pole piece preparation device;

[0026] 110 - Transmission component; 111 - Unwinding piece; 112 - Rewinding piece;

[0027] 113 - Inlet end; 114 - Outlet end; 120 - Coating component;

[0028] 130 - Magnetization component; 131 - First magnetization piece; 132 - Second magnetization piece;

[0029] 140 - Baking component; 141 - First baking cavity; 142 - Second baking cavity;

[0030] 150 - Blowing component; 151 - Upper blowing piece; 152 - Lower blowing piece;

[0031] 160 - Power supply component; 170 - Control component;

[0032] 200 - Base material; 210 - Coating surface. Detailed implementation manners

[0033] Lithium - ion batteries usually use graphite as the negative electrode active material. Graphite has a layered structure. During the charging process of the battery, lithium ions are inserted into the gaps between the graphite layers from the edges of the layered graphite, and thus a Li - graphite inclusion compound is obtained.

[0034] When preparing the negative electrode sheet, the plane of the graphite particles is usually parallel to the plane of the current collector. However, during the charge - discharge process of the lithium - ion battery, lithium ions tend to diffuse perpendicular to the plane of the current collector. This is because, for example, during the charging process, if lithium ions are inserted into the gaps between the graphite layers from the edges of the layered graphite in the direction parallel to the plane of the current collector, this will result in a longer transmission path for lithium ions, and the interlayer spacing of the graphite layers is relatively small, causing a larger diffusion resistance for lithium ions. Therefore, in order to reduce the resistance during lithium - ion diffusion and improve the diffusion effect of lithium ions, the arrangement direction of the graphite particles is usually changed so that the arrangement direction of the graphite particles is perpendicular to the plane of the current collector.

[0035] In the related art, generally, a magnetic field is used to change the arrangement direction of graphite particles on the current collector plane. The specific method is as follows: the negative electrode paste is coated on a substrate, and then a certain magnetic field is applied to turn the graphite particles, and then drying and compaction are carried out to obtain the negative electrode sheet. However, in the related art, the magnetization effect on the graphite particles is low. After the magnetic field is removed, a part of the graphite particles will still turn in the paste, the change effect of the arrangement direction of the graphite particles is poor, and the diffusion resistance of lithium ions is still large.

[0036] In view of the above technical problems, the embodiments of the present application provide a pole piece preparation device, a pole piece preparation method and a pole piece. By including a transmission component, in this way, it is helpful to realize the movement of the substrate along the transmission direction, and then ensure that coating and baking can be normally carried out on the coating surface of the substrate; by including a coating component, it can play a role in supplying the paste and realizing the coating on the coating surface of the substrate; by including a baking component, it is helpful to bake the substrate coated with the paste until it becomes solid, and finally obtain the pole piece through compaction; by including a magnetization component, the magnetization component is located downstream of the coating component. In this way, it is helpful to magnetize the particles in the paste on the substrate after coating the paste, so as to be beneficial to extending the magnetization path of the particles in the paste, increasing the magnetization area of the particles in the paste, and further being beneficial to changing the arrangement direction of the particles in the paste on the substrate to the greatest extent, ensuring that the plane of the particles in the paste is perpendicular to the substrate plane, and being beneficial to significantly improving the consistency of the arrangement of the particle plane in the direction perpendicular to the substrate plane. Thus, on the basis of ensuring the production efficiency of the pole piece, the diffusion effect of lithium ions can be ensured, the resistivity and the internal resistance of the battery can be reduced, the charging ability can be improved, the deterioration of the battery can be slowed down, and thus the low temperature, rate and cycle performance of the lithium ion battery can be improved to the greatest extent.

[0037] To make the objectives, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar components or components with the same or similar functions from beginning to end. The described embodiments are some but not all of the embodiments of the present application. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present application and should not be construed as a limitation to the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present application.

[0038] Refer to Figure 1 and Figure 2 As shown, the embodiments of the present application provide a pole piece preparation device 100, and the pole piece preparation device 100 may include a transmission component 110, a coating component 120, a magnetization component 130 and a baking component 140.

[0039] It should be noted that the electrode sheet preparation device 100 provided in this embodiment can prepare a positive electrode sheet, or the electrode sheet preparation device 100 provided in this embodiment can prepare a negative electrode sheet. In this embodiment, the preparation of a negative electrode sheet is mainly taken as an example for illustration.

[0040] In the embodiment of the present application, the transmission component 110 is used to transmit the substrate 200 and drive the substrate 200 to move along the transmission direction. During the working process, with reference to Figure 1 As shown, the transmission component 110 may include an unwinding member 111 and a winding member 112. The unwinding member 111 is a device for unloading and flattening the substrate 200, and the winding member 112 is a device for winding up the substrate 200.

[0041] Exemplarily, the unwinding member 111 may be an unwinding roller, and the winding member 112 may be a winding roller. The unwinding member 111 can drive the rotation of the roller through a motor, so that the core on the unwinding member 111 rotates continuously, thereby keeping the substrate 200 under uniform tension all the time. The winding member 112 can also be realized by driving the rotation of the roller through a motor.

[0042] It should be noted that in this embodiment, the transmission direction of the substrate 200 is not limited, and the substrate 200 can be actually transmitted according to actual needs. Exemplarily, the transmission direction of the substrate 200 can be referred to Figure 1 and Figure 2 as shown by the arrow A direction.

[0043] It should be noted that the type of the substrate 200 is not limited in this embodiment. Exemplarily, taking the preparation of a negative electrode sheet as an example, the substrate 200 can be a copper foil current collector, or the substrate 200 can be an aluminum foil current collector, and this embodiment does not limit this. It should be noted that the current collector is also called an electrolyte, which can provide an ionic conductor in an electrochemical reaction. Its main function is to allow the transfer of ions between positive and negative charges and maintain the flow of current.

[0044] In the embodiment of the present application, along the transmission direction of the substrate 200, the coating component 120 is arranged close to the feeding end 113 of the transmission component 110, and the coating component 120 is used to coat the slurry on the coating surface 210 of the substrate 200.

[0045] Exemplarily, the coating component 120 may include a slurry tank, and the slurry tank can be used to store the slurry that needs to be coated on the coating surface 210 of the substrate 200. Exemplarily, a coating pump nozzle can be installed on the slurry tank, so as to realize the coating on the coating surface 210 of the substrate 200 through the coating pump nozzle. This embodiment does not limit this.

[0046] It should be noted that the substrate 200 includes an upper surface and a lower surface. Therefore, the coating surface 210 of the substrate 200 can refer to the upper surface of the substrate 200, or the coating surface 210 of the substrate 200 can refer to the lower surface of the substrate 200. During the actual coating process, generally, both the upper surface and the lower surface of the substrate 200 need to be coated. For example, the negative electrode slurry can be extrusion-coated or sprayed on the upper and lower surfaces of the substrate 200. In addition, the thickness of the coating is not limited, and a reasonable coating thickness can be determined according to actual needs. This embodiment does not limit it.

[0047] It should be noted that the coating assembly 120 is arranged close to the feeding end 113 of the conveying assembly 110. In this way, it helps to ensure that the substrate 200 can be coated from the beginning of conveying, ensuring the coating area of the coating surface 210 of the substrate 200, so as to ensure the coating effect of the substrate 200 to the greatest extent. Among them, the specific distance between the coating assembly 120 and the feeding end 113 is not limited and can be set according to actual needs.

[0048] In the embodiment of the present application, the baking assembly 140 is close to the discharging end 114 of the conveying assembly 110, and the baking assembly 140 is used to bake the substrate 200 coated with the slurry.

[0049] Exemplarily, the baking assembly 140 can be an oven. Among them, the shape, size, etc. of the oven are not limited and can be set according to actual needs.

[0050] It can be understood that the baking assembly 140 has an inlet and an outlet. The inlet is close to the coating assembly 120, and the outlet is close to the discharging end 114 of the conveying assembly 110. During the actual working process, the substrate 200 coated with the slurry enters the baking assembly 140 through the inlet, is baked for a period of time until it becomes solid, is conveyed through the outlet and wound by the winding member 112, and finally is compacted to obtain the negative electrode sheet.

[0051] It should be noted that the baking time of the substrate 200 coated with the slurry is not limited, and can be set according to the coating thickness or the coating area of the slurry on the substrate 200, etc. This embodiment does not limit it.

[0052] It should be noted that the baking component 140 is arranged close to the discharging end 114 of the conveying component 110. This is because if the baking component 140 is set at a position that is too far forward (for example, close to the feeding end 113), the substrate 200 coated with the slurry will be baked from the start of conveyance, resulting in a relatively high adhesion between the particles in the slurry and the coating surface 210 from the start of conveyance of the substrate 200. As a result, it is difficult for the magnetization component 130 to change the arrangement direction of the particles in the slurry. Therefore, in the embodiment of the present application, arranging the baking component 140 close to the discharging end 114 of the conveying component 110 helps to ensure magnetization of the particles in the slurry coated thereon, so as to change the arrangement direction of the particles in the slurry on the substrate 200.

[0053] In the embodiment of the present application, along the conveying direction of the substrate 200, the magnetization component 130 is located downstream of the coating component 120, and the magnetization component 130 is used to magnetize the particles in the slurry to change the arrangement direction of the particles in the slurry.

[0054] It should be noted that the magnetization component 130 being located downstream of the coating component 120 can also be understood as that, along the conveying direction of the substrate 200, the magnetization component 130 is located after the coating component 120. Among them, the specific position of the magnetization component 130 is not limited.

[0055] Exemplarily, the magnetization component 130 in this embodiment can be a magnet. For example, the magnetization component 130 can be a permanent magnet, or the magnetization component 130 can be an electromagnet. This is not limited in this embodiment.

[0056] It should be noted that the magnetization principle of the magnetization component 130 in this embodiment is as follows: The magnetization component 130 has a magnetic circuit, and the magnetic circuit is in the direction perpendicular to the surface of the substrate 200. Under the magnetic field force of the magnetization component 130, the arrangement direction of the particles in the slurry changes from the direction parallel to the surface of the substrate 200 to the direction perpendicular to the surface of the substrate 200.

[0057] Therefore, the electrode sheet preparation device 100 provided by the present application helps to magnetize the particles in the slurry on the substrate 200 after coating the slurry, thereby benefiting from extending the magnetization path of the particles in the slurry, increasing the magnetization area of the particles in the slurry, and further benefiting from changing the arrangement direction of the particles in the slurry on the substrate 200 to the greatest extent, ensuring that the plane of the particles in the slurry is perpendicular to the plane of the substrate 200, and also benefiting from significantly improving the consistency of the arrangement of the particle plane in the direction perpendicular to the plane of the substrate 200, so as to ensure the diffusion effect of lithium ions on the basis of ensuring the production efficiency of the electrode sheet, and maximizing the low-temperature, rate, and cycle performance of the lithium-ion battery made from this slurry.

[0058] In an implementable embodiment, the magnetization assembly 130 may include a first magnetization member 131 and a second magnetization member 132. Among them, the first magnetization member 131 may be located outside the baking assembly 140, between the baking assembly 140 and the coating assembly 120, and spaced apart from the coating surface 210 of the substrate 200. The second magnetization member 132 may be located inside the baking assembly 140 and spaced apart from the coating surface 210 of the substrate 200.

[0059] In the embodiments of the present application, the first magnetization member 131 may be located outside the baking assembly 140 and between the baking assembly 140 and the coating assembly 120. In this way, during the process of coating the slurry on the substrate 200 and before baking, the adhesion between the ions in the slurry and the coating surface 210 is relatively low. At this time, when the first magnetization member 131 magnetizes the particles in the slurry, the resistance of the particles in the slurry during rotation is small. Therefore, when the viscosity of the slurry is low, the arrangement direction of the particles is more likely to be inclined towards the direction parallel to the plane of the substrate 200.

[0060] In the embodiments of the present application, the second magnetization member 132 may be located inside the baking assembly 140. In this way, magnetization can be carried out while baking, so that baking is completed when magnetization is completed, which helps to save the preparation time of the process and also helps to save the preparation process of the process and improve the preparation efficiency.

[0061] In the embodiments of the present application, both the first magnetization member 131 and the second magnetization member 132 are arranged close to the coating surface 210 of the substrate 200. In this way, it is beneficial to avoid the problem that the coating of the substrate 200 is affected when the first magnetization member 131 and the second magnetization member 132 are in direct contact with the substrate 200, so as to ensure the coating effect of the substrate 200 to the greatest extent.

[0062] It should be noted that there are no limitations on the number of settings, arrangement methods, etc. of the first magnetization member 131, which can be specifically set according to actual needs. Similarly, there are no limitations on the number of settings, arrangement methods, etc. of the second magnetization member 132, which can be specifically set according to actual needs.

[0063] In an implementable embodiment, the number of magnetization assemblies 130 may be multiple. Exemplarily, the number of magnetization assemblies 130 may be two, three, eight or more. There is no limitation on this in this embodiment.

[0064] It should be noted that there is no limitation on the setting positions of the multiple magnetization assemblies 130 in this embodiment. Exemplarily, the following method can be referred to for setting. It should be noted that the setting positions of the multiple magnetization assemblies 130 include but are not limited to the following methods.

[0065] In some embodiments, along the thickness direction of the substrate 200, a plurality of magnetization components 130 can be respectively arranged on opposite sides close to the substrate 200. In this way, the generated magnetic field can form a magnetic field with a consistent direction and uniform distribution in the entire action area, so that the particles can achieve a consistent arrangement in a direction perpendicular to the plane of the substrate 200.

[0066] In some embodiments, a plurality of magnetization components 130 can be arranged on one side close to the lower surface of the substrate 200. In this way, the magnetization components 130 magnetize the particles in the slurry from the lower surface of the substrate 200, which helps to avoid the problem of affecting the normal coating of the substrate 200, and then ensures the continuous coating of the substrate 200 and the coating effect of the substrate 200.

[0067] In some embodiments, a plurality of magnetization components 130 can also be arranged on one side close to the upper surface of the substrate 200. This embodiment does not make any limitation in this regard.

[0068] In the embodiments of the present application, with reference to Figure 1 as shown, mainly taking the case where a plurality of magnetization components 130 are arranged on one side close to the lower surface of the substrate 200 as an example for description.

[0069] In an implementable embodiment, with reference to Figure 1 and Figure 2 as shown, the baking component 140 can include a first baking chamber 141 and a second baking chamber 142 that are connected and communicate with each other. The second baking chamber 142 is located on one side of the first baking chamber 141 close to the discharge end 114 of the transfer component 110. Among them, the second magnetizing member 132 is located in the first baking chamber 141 and is arranged at an interval close to the coating surface 210 of the substrate 200.

[0070] In the embodiments of the present application, the second magnetizing member 132 is located in the first baking chamber 141 because the first baking chamber 141 is the initial baking stage. At this time, the baking temperature of the substrate 200 located in the first baking chamber 141 is relatively low, the adhesion between the particles in the slurry and the coating surface 210 is relatively low, the resistance of the particles in the slurry to turn under the magnetic field of the second magnetizing member 132 is small, and it is relatively easy for the magnetization component 130 to change the arrangement direction of the particles in the slurry, which helps to improve the arrangement consistency of the particles in the plane.

[0071] In the embodiment of the present application, the second magnetization member 132 is not provided in the second baking chamber 142 because the baking temperature is relatively high when reaching the second baking chamber 142. At this time, the adhesion between the particles in the slurry and the coating surface 210 is relatively high, resulting in that it is not easy for the magnetization assembly 130 to change the arrangement direction of the particles in the slurry. Therefore, the second baking chamber 142 only realizes the baking of the slurry on the substrate 200. Thus, the particles in the slurry reach a consistent arrangement in the direction perpendicular to the plane of the substrate 200 under the dual actions of magnetization and baking.

[0072] In an implementable embodiment, with reference to Figure 1 and Figure 2 as shown, a plurality of blowing components 150 can be arranged at intervals in the baking component 140. The blowing component 150 has a blowing port, the blowing port faces the coating surface 210 of the substrate 200, and the blowing component 150 and the magnetization component 130 are arranged in a dislocation manner with respect to the thickness direction of the substrate 200.

[0073] It should be noted that the blowing component 150 in this embodiment mainly blows hot air. In this way, blowing hot air while the baking component 140 is baking helps to improve the drying speed of the substrate 200 coated with the slurry.

[0074] In the embodiment of the present application, there are no limitations on the number of the blowing components 150, the arrangement manner, etc., which can be specifically set according to actual needs. In addition, there are no limitations on the installation position of the blowing component 150. Exemplarily, the blowing component 150 can be arranged in the first baking chamber 141, or the blowing component 150 can be arranged in the second baking chamber 142. There are no limitations on this in this embodiment.

[0075] It should be noted that the blowing component 150 and the magnetization component 130 are arranged in a dislocation manner with respect to the thickness direction of the substrate 200. In this way, it helps to avoid the mutual interference between the blowing component 150 and the magnetization component 130, and further ensures that the blowing component 150 blows air to the coating surface 210 of the substrate 200 normally and ensures that the magnetization component 130 magnetizes the particles in the slurry normally.

[0076] It should be noted that the dislocation arrangement means that the positive projections of the blowing component 150 and the magnetization component 130 on the same horizontal plane of the substrate 200 do not overlap.

[0077] In an implementable embodiment, with reference to Figure 1 and Figure 2 as shown, the blowing component 150 can include an upper blowing member 151 and a lower blowing member 152. Along the thickness direction of the substrate 200, the upper blowing member 151 and the lower blowing member 152 are arranged on opposite sides of the baking component 140, and the upper blowing member 151 and the lower blowing member 152 respectively have blowing ports.

[0078] Exemplarily, the upper air blowing member 151 may be an upper air nozzle, and the lower air blowing member 152 may be a lower air nozzle. There is no limitation in this embodiment.

[0079] In some embodiments, the magnetization assembly 130 and the upper air blowing member 151 may be arranged in a staggered manner with respect to the thickness direction of the substrate 200. In this way, it helps to avoid mutual interference between the magnetization assembly 130 and the upper air blowing member 151. In some embodiments, the magnetization assembly 130 and the lower air blowing member 152 may be arranged in a staggered manner with respect to the thickness direction of the substrate 200. In this way, it helps to avoid mutual interference between the magnetization assembly 130 and the lower air blowing member 152. In some embodiments, the upper air blowing member 151 and the lower air blowing member 152 may be arranged in a staggered manner with respect to the thickness direction of the substrate 200. In this way, it helps to avoid mutual interference between the upper air blowing member 151 and the lower air blowing member 152, thereby maximizing the air blowing volume and ensuring the air blowing effect.

[0080] It should be noted that the arrangement manners of the upper air blowing member 151, the lower air blowing member 152 and the magnetization assembly 130 in this embodiment include but are not limited to the above-mentioned various manners.

[0081] In a feasible implementation manner, a lifting member may further be included. The lifting member is connected to the magnetization assembly 130, and the lifting member is used to drive the lifting of the magnetization assembly 130.

[0082] There is no limitation on the type of the lifting member in this embodiment. Exemplarily, the lifting member may be an electric lead screw. By driving the magnetization assembly 130 to rise or fall through the electric lead screw, it helps to adjust the position of the magnetization device according to the actual position of the substrate 200, and the degree of automation is relatively high.

[0083] Exemplarily, the lifting range of the lifting member may be between 0 - 20 mm, and the lifting precision of the lifting member may be 0.05°. The lifting precision of the lifting member is relatively high. There is no limitation in this embodiment.

[0084] In the embodiment of the present application, the pole piece preparation device 100 may further include a translation member. The translation member is connected to the magnetization assembly 130, and the translation member is used to drive the horizontal movement of the magnetization assembly 130.

[0085] There is no limitation on the type of the translation member in this embodiment. Exemplarily, the translation member may be a slider. A sliding groove may be provided on the magnetization assembly 130, and the slider slides correspondingly in the sliding groove to realize the translation of the magnetization assembly 130; or, the translation member may be a sliding groove, and a pulley may be provided on the magnetization assembly 130. There is no limitation in this embodiment.

[0086] In the embodiment of the present application, the polar plate preparation device 100 may further include an angle adjusting member, which is used to adjust the angle between the magnetization assembly 130 and the plane of the base material 200 to ensure the magnetization accuracy during the magnetization process. Exemplarily, the angle adjustment range of the angle adjusting member may be between -10° and +10°, and the adjustment accuracy of the angle adjusting member is not greater than 0.5°, with a relatively high adjustment accuracy. This embodiment does not make any limitations in this regard.

[0087] In an implementable embodiment, referring to Figure 1 and Figure 2 as shown, it may further include a power supply member 160, which is electrically connected to the lifting member and the translation member respectively, and the power supply member 160 is used to supply power to the lifting member and the translation member.

[0088] In this embodiment, the type of the power supply member 160 is not limited. Exemplarily, the power supply member 160 may be an electric box, or the power supply member 160 may be a DC power supply or a regulated power supply. This embodiment does not make any limitations in this regard. Additionally, the electrical connection manner between the power supply member 160 and the lifting member and the translation member respectively is not limited. For example, it may be electrically connected by wired or wireless means.

[0089] In the embodiment of the present application, referring to Figure 1 and Figure 2 as shown, the polar plate preparation device 100 may further include a control member 170, which is electrically connected to the lifting member and the translation member respectively, and the control member 170 is used to control the lifting of the lifting member and the horizontal movement of the translation member.

[0090] In this embodiment, the type of the control member 170 is not limited. Exemplarily, the control member 170 may be a controller.

[0091] In an implementable embodiment, it may further include a magnetic induction member, which is arranged on the magnetization assembly 130 and is electrically connected to the control member 170. The magnetic induction member is used to sense the magnetic field strength value of the magnetization assembly 130 and send the magnetic field strength value to the control member 170.

[0092] Exemplarily, the magnetic induction member may be a magnetic induction probe, which is a sensor for detecting the magnetic field strength and mainly uses the principle of electromagnetic induction to judge the magnetic field strength and direction by detecting the change of the magnetic field. In this way, the control member 170 helps to judge the strength of the magnetic field according to the magnetic field strength value, so that more magnetization assemblies 130 can be placed in the area with a weaker magnetic field.

[0093] In the embodiment of the present application, the polar plate preparation device 100 may further include a magnetic isolation protection member, which is arranged above the magnetization assembly 130 to form a protection state of the magnetization assembly 130.

[0094] It should be noted that the magnetic shielding member can be a magnetic shielding plate. The magnetic shielding plate is mainly applied when the magnetization assembly 130 is in an unused or completed state. Placing the magnetic shielding plate above the magnetization assembly 130 helps prevent magnetic positions from falling onto the magnetization assembly 130, thereby ensuring the structural integrity of the magnetization assembly 130, avoiding the risk of damage to the magnetization assembly 130, ensuring the normal operation of the magnetization assembly 130, and helping to extend the service life of the magnetization assembly 130.

[0095] In an implementable embodiment, along the thickness direction of the substrate 200, the distance between the magnetization assembly 130 and the surface of the substrate 200 may not be greater than 2 mm.

[0096] In the embodiment of the present application, the distance d between the magnetization assembly 130 and the lower surface of the substrate 200 is not greater than 2 mm. Exemplarily, referring to Figure 3 As shown, the distance d between the magnetization assembly 130 and the surface of the substrate 200 can be set to 0 mm, 0.5 mm, 1 mm, 1.5 mm, 2 mm or any value not greater than 2 mm according to actual needs.

[0097] If the distance between the magnetization assembly 130 and the surface of the substrate 200 is greater than 2 mm, it is likely to cause the magnetization force of the magnetization assembly 130 on the substrate 200 coated with the slurry to weaken, and it is not easy to change the arrangement direction of the particles in the slurry on the substrate 200. Therefore, in the embodiment of the present application, setting the distance between the magnetization assembly 130 and the surface of the substrate 200 not to be greater than 2 mm is beneficial to ensuring the magnetization force of the magnetization assembly 130 on the particles in the coated slurry, and further realizing the change of the arrangement direction of the particles in the slurry on the substrate 200.

[0098] In the embodiment of the present application, the length of the baking assembly 140 can be twice the length of the substrate 200 moving along the preset speed within the preset time. Exemplarily, taking the maximum moving speed of the substrate 200 as 90 m / min as an example, the length of the baking assembly 140 is 180 m. In this way, it can ensure the complete baking of the substrate 200 to the greatest extent, and is beneficial to avoiding the problem that the substrate 200 cannot be baked in time when the moving speed of the substrate 200 is too fast.

[0099] In an implementable embodiment, the first magnetizing member 131 can be a permanent magnet or an electromagnet, and the second magnetizing member 132 can be a permanent magnet.

[0100] It should be noted that a permanent magnet refers to a magnet that can continuously maintain a certain magnetic field, and is usually made of hard magnetic materials such as ferrite. An electromagnet is a device that generates a magnetic field around a coil through an electric current, such as an electromagnetic coil.

[0101] It should be noted that the first magnetizing member 131 is a permanent magnet or an electromagnet, because the external environment of the baking assembly 140 is not a high-temperature environment, so it will not affect the electromagnet. The second magnetizing member 132 is a permanent magnet, because the internal environment of the baking assembly 140 is a high-temperature environment, which is likely to cause the temperature of the electromagnet to be too high, resulting in a high resistance of the electromagnet, a high energy consumption of the electromagnet, and a risk of fusing or damage to the electromagnet itself.

[0102] In the embodiment of the present application, the magnetic field intensity range of the first magnetizing member 131 can be between 0.4T and 2T, the magnetic field width range of the first magnetizing member 131 can be between 150mm and 1500mm, and the magnetic field length of the first magnetizing member 131 can be M / 5n. Among them, the specific values of the magnetic field intensity and magnetic field width of the first magnetizing member 131 are not further limited. Exemplarily, the magnetic field width of the first magnetizing member 131 can be the same as the width of the base material 200.

[0103] In the embodiment of the present application, the magnetic field intensity range of the second magnetizing member 132 can be between 0.4T and 2T, the magnetic field width range of the second magnetizing member 132 can be between 150mm and 1500mm, and the magnetic field length of the second magnetizing member 132 can be M / 5n. Among them, the specific values of the magnetic field intensity and magnetic field width of the second magnetizing member 132 are not further limited. Exemplarily, the magnetic field width of the second magnetizing member 132 can be the same as the width of the base material 200.

[0104] Wherein, M is the moving speed of the base material 200, with the unit of m / min, and n is the number of magnetizing assemblies 130. It should be noted that generally, the total time of the magnetic field action in the present application is controlled within 12s. Therefore, the derivation formula of M / 5n is: M / 60 * 12 = M / 5, where 60 is 1 minute, with the unit of s, and 12 has the unit of s.

[0105] For example, the total number of magnetizing assemblies 130 is 6, and the magnetic field length of the magnetizing assembly 130 is M / 5 * 6 = M / 30.

[0106] In an implementable embodiment, the magnetic circuit mode of the magnetizing assembly 130 is not limited in this embodiment. Exemplarily, the magnetic circuit mode of the magnetizing assembly 130 can be a single-pole upward arrangement; or, the magnetic circuit mode of the magnetizing assembly 130 can be an NS staggered upward arrangement; or, the magnetic circuit mode of the magnetizing assembly 130 can be a like-pole facing arrangement. This embodiment does not limit this.

[0107] Refer to Figure 4 As shown, the embodiment of the present application further provides a method for preparing a pole piece for a pole piece preparation device. The method for preparing a pole piece may include:

[0108] S100: Input a substrate onto the transmission component and drive the substrate to move.

[0109] Among them, in this embodiment, the moving speed of the substrate is not limited.

[0110] S200: The coating component coats the slurry on the coating surface of the substrate.

[0111] Among them, in this embodiment, taking the preparation of the negative electrode sheet as an example, the negative electrode slurry can be graphite slurry, and the graphite slurry can be sprayed on the coating surface 210 of the substrate 200 by means of extrusion coating or spraying.

[0112] Among them, in this embodiment, the coating surface 210 can include the upper surface and the lower surface of the substrate 200, and both the upper surface and the lower surface are coated, and the coating order of the upper surface and the lower surface is not limited.

[0113] S300: The magnetization component performs primary magnetization on the particles in the slurry.

[0114] Among them, in this embodiment, primary magnetization refers to magnetizing the particles in the slurry that are outside the baking component 140 and between the baking component 140 and the coating component 120.

[0115] S400: The magnetization component performs secondary magnetization on the particles in the slurry that have been primarily magnetized, and the baking component bakes the magnetized substrate.

[0116] Among them, in this embodiment, secondary magnetization refers to magnetizing the particles in the slurry coated on the inside of the first baking cavity 141.

[0117] Among them, in this embodiment, the baking component 140 baking the magnetized substrate 200 can include: the baking component 140 baking the substrate 200 that has been primarily magnetized, or the baking component 140 baking the substrate 200 after secondary magnetization. This embodiment does not limit this.

[0118] In an implementable embodiment, during the process of the baking component 140 baking the magnetized substrate 200, it can further include: the baking component 140 performing primary baking on the substrate 200 that has been primarily magnetized and is in the process of secondary magnetization; the baking component 140 performing secondary baking on the substrate 200 after secondary magnetization and primary baking.

[0119] Among them, in this embodiment, the baking component 140 performing primary baking on the substrate 200 that has been primarily magnetized and is in the process of secondary magnetization means: the first baking cavity 141 baking the substrate 200.

[0120] Among them, in this embodiment, the baking component 140 baking the substrate 200 after secondary magnetization and primary baking means that the second baking chamber 142 bakes the substrate 200.

[0121] An embodiment of the present application provides a pole piece, which is prepared by a pole piece preparation method; alternatively, the pole piece is prepared by a pole piece preparation device 100. This embodiment does not make a limitation on this.

[0122] Exemplarily, the pole piece can be a positive pole piece or a negative pole piece. In this embodiment, the preparation of the negative pole piece is mainly taken as an example for illustration.

[0123] Therefore, an embodiment of the present application provides a pole piece preparation device, a pole piece preparation method and a pole piece. By including a transmission component, in this way, it helps to realize the movement of the substrate along the transmission direction, and further ensures that coating and baking can be normally carried out on the coating surface of the substrate; by including a coating component, it can play a role in supplying the slurry and realizing the coating on the coating surface of the substrate; by including a baking component, it helps to bake the substrate coated with the slurry until it becomes solid, and finally obtain the pole piece after compaction; by including a magnetization component, the magnetization component is located downstream of the coating component. In this way, it helps to magnetize the particles in the slurry on the substrate after coating the slurry, thereby being beneficial to extending the magnetization path of the particles in the slurry, increasing the magnetization area of the particles in the slurry, and further being beneficial to changing the arrangement direction of the particles in the slurry on the substrate to the greatest extent, ensuring that the plane of the particles in the slurry is perpendicular to the plane of the substrate, and being beneficial to significantly improving the consistency of the arrangement of the particle plane in the direction perpendicular to the plane of the substrate. Thus, on the basis of ensuring the production efficiency of the pole piece, it can ensure the diffusion effect of lithium ions, reduce the resistivity and the internal resistance of the battery, improve the charging ability, slow down the deterioration of the battery, and thus maximize the low-temperature, rate and cycle performance of the lithium-ion battery.

[0124] It should be noted that in the description of the embodiments of the present application, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, or indirectly connected through an intermediate medium, and can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0125] In the description of the embodiments of the present application, the term "and / or" only represents an association relationship for describing associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the term "at least one" means any one of a plurality or any combination of at least two of a plurality. For example, including at least one of A and B can represent any one or more elements selected from the set including A, B, and C.

[0126] In the description of the embodiments of the present application, the orientation or positional relationship indicated by terms such as "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application. In addition, the meaning of the term "plurality" is two or more, unless otherwise specifically and precisely defined.

[0127] In the description of the embodiments of the present application, terms such as "first", "second", "third", "fourth", etc. (if any) are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application described here can be implemented in an order other than those illustrated or described here. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.

[0128] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A pole piece preparation device, characterized in that: It includes a coating component (120) and a magnetizing component (130); Along the transmission direction of the substrate (200), the coating component (120) is located upstream of the magnetizing component (130), the coating component (120) is used to coat the coating surface (210) of the substrate (200) with slurry, and the magnetizing component (130) is used to magnetize particles in the slurry to change the arrangement direction of the particles in the slurry.

2. The pole piece preparation device according to claim 1, characterized in that: Also included is a transmission component (110) and a baking component (140); The transmission component (110) is used to transmit the substrate (200) and drive the substrate (200) to move along the transmission direction; the baking component (140) is close to the discharge end (114) of the transmission component (110), and the baking component (140) is used to bake the substrate (200) coated with slurry.

3. The pole piece preparation device according to claim 2, characterized in that: The magnetizing component (130) comprises a first magnetizing component (131) and a second magnetizing component (132); The first magnetized component (131) is located outside the baking component (140), between the baking component (140) and the coating component (120), and is spaced apart from the coating surface (210) of the substrate (200); The second magnetizable element (132) is located in the baking assembly (140) and is spaced apart from the coating surface (210) of the substrate (200).

4. The pole piece preparation device according to claim 3, characterized in that: The number of the magnetization components (130) is multiple; Along the thickness direction of the substrate (200), the plurality of magnetization components (130) are respectively arranged on two opposite sides close to the substrate (200); Or, a plurality of the magnetization components (130) are arranged on one side close to the lower surface of the substrate (200); Alternatively, a plurality of the magnetization components (130) are arranged on a side close to the upper surface of the substrate (200).

5. The pole piece preparation device according to claim 4, characterized in that: The baking component (140) comprises a first baking chamber (141) and a second baking chamber (142) which are connected to each other, and the second baking chamber (142) is located on a side of the first baking chamber (141) close to a material discharge end (114) of the transmission component (110); The second magnetizable element (132) is located in the first baking chamber (141) and is spaced apart from the coating surface (210) of the substrate (200).

6. The pole piece preparation device according to any one of claims 2 to 5, characterized in that: A plurality of blowing assemblies (150) are arranged at intervals inside the baking assembly (140), the blowing assemblies (150) having blowing ports, the blowing ports facing the coated surface (210) of the substrate (200), and the blowing assemblies (150) and the magnetizing assembly (130) are arranged in a staggered manner relative to the thickness direction of the substrate (200).

7. The pole piece preparation device according to claim 6, characterized in that: The blowing assembly (150) comprises an upper blowing member (151) and a lower blowing member (152); along the thickness direction of the substrate (200), the upper blowing member (151) and the lower blowing member (152) are arranged on opposite sides of the baking assembly (140); the upper blowing member (151) and the lower blowing member (152) respectively have the blowing port; The magnetization component (130) and the upper blowing member (151) are arranged in a staggered manner relative to the thickness direction of the substrate (200); And / or, the magnetization component (130) and the downward blowing member (152) are arranged in a staggered manner relative to the thickness direction of the substrate (200); And / or, the upper blowing member (151) and the lower blowing member (152) are arranged in a staggered manner relative to the thickness direction of the substrate (200).

8. The pole piece preparation device according to any one of claims 1 to 5, characterized in that: It also comprises a lifting member, the lifting member being connected to the magnetizing assembly (130), and the lifting member being used to drive the magnetizing assembly (130) to rise and fall; The pole piece preparation device also includes a translation member, the translation member is connected to the magnetization component (130), and the translation member is used to drive the horizontal movement of the magnetization component (130).

9. The pole piece preparation device according to any one of claims 1 to 5, characterized in that: It also includes an angle adjustment member, which is used to adjust the angle between the magnetization component (130) and the plane of the substrate (200).

10. The pole piece preparation device according to claim 8, characterized in that: It also comprises a power supply component (160), the power supply component (160) being electrically connected to the lifting component and the translation component respectively, and the power supply component (160) being used to supply power to the lifting component and the translation component; The pole piece preparation device further comprises a control component (170), the control component (170) being electrically connected to the lifting component and the translation component respectively, and the control component (170) being used to control the lifting and lowering of the lifting component and the translation of the translation component.

11. The pole piece preparation device according to claim 10, characterized in that: It also includes a magnetic induction component, the magnetic induction component is arranged on the magnetizing component (130), the magnetic induction component is electrically connected to the control component (170), and the magnetic induction component is used to sense the magnetic field strength of the magnetizing component (130) and send the magnetic field strength to the control component (170); And / or, the pole piece preparation device further comprises a magnetic shielding protection member, and the magnetic shielding protection member is arranged on the magnetization component (130).

12. The pole piece preparation device according to any one of claims 2 to 5, characterized in that: Along the thickness direction of the substrate (200), the distance between the magnetization component (130) and the surface of the substrate (200) is no greater than 2 mm; And / or, the length of the baking component (140) is twice the length of the substrate (200) moving at a preset speed within a preset time.

13. The pole piece preparation device according to any one of claims 3 to 5, characterized in that: The first magnetized component (131) is a permanent magnet or an electromagnet, the magnetic field strength of the first magnetized component (131) ranges from 0.4T to 2T, the magnetic field width of the first magnetized component (131) ranges from 150mm to 1500mm, and the magnetic field length of the first magnetized component (131) ranges from M / 5n; And / or, the second magnetized member (132) is a permanent magnet, the magnetic field strength of the second magnetized member (132) ranges from 0.4T to 2T, the magnetic field width of the second magnetized member (132) ranges from 150mm to 1500mm, and the magnetic field length of the second magnetized member (132) is M / 5n; Wherein, M is the moving speed of the substrate, in m / min, and n is the number of magnetized components.

14. A pole piece, characterized in that: The pole piece is prepared by using the pole piece preparation device described in any one of claims 1 to 13.

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