Pole manufacturing equipment and battery production systems

Abstract

The present application relates to a pole piece manufacturing device and a battery production system. The pole piece manufacturing device includes: a vibration component, which is arranged on the conveying path of the current collector, the current collector having a first surface and a second surface opposite to each other along its thickness direction, the first surface coated with an undried electrode active slurry, the vibration end of the vibration component is arranged on the side close to the second surface of the current collector, so that the area of ​​the first surface facing the vibration end forms a main vibration zone, and the area of ​​the first surface adjacent to the main vibration zone forms an auxiliary vibration zone through vibration transmission; a reinforcement component, the reinforcement component is at least partially arranged above the auxiliary vibration zone, and is configured to at least reflect the ultrasonic wave of the auxiliary vibration zone, so that the ultrasonic wave energy intensity on the auxiliary vibration zone approaches the ultrasonic wave energy intensity of the main vibration zone. The pole piece manufacturing device of the present application can effectively improve the coating quality consistency of wet film pole pieces.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a pole piece manufacturing device and a battery production system. Background Art

[0002] During the battery production process, the pole pieces need to undergo multiple operations, such as pole piece coating, cold pressing, die cutting, winding, etc. Among them, pole piece coating refers to: evenly coating the electrode active slurry (positive electrode / negative electrode slurry) on the surface of the metal current collector, and after drying, the battery pole piece is formed.

[0003] In the related art, the electrode active slurry has poor natural leveling ability and poor leveling consistency on the surface of the current collector, resulting in poor coating quality consistency such as uneven thickness and uneven mass distribution of the wet film electrode, resulting in poor battery capacity consistency. Summary of the Invention

[0004] The present application aims to at least solve the problem of poor natural leveling ability and poor leveling consistency of the electrode active slurry on the collector surface, resulting in poor coating quality consistency of the wet film electrode. The present application provides an electrode manufacturing equipment and a battery production system.

[0005] In a first aspect, the present application provides a pole piece manufacturing device, comprising:

[0006] A vibration assembly is provided on a conveyor path of a current collector, the current collector having a first surface and a second surface facing each other along its thickness direction, the first surface being coated with an undried electrode active slurry, the vibration end of the vibration assembly being provided on a side adjacent to the second surface of the current collector, such that an area of ​​the first surface facing the vibration end forms a primary vibration zone, and an area of ​​the first surface adjacent to the primary vibration zone forms an auxiliary vibration zone through vibration transmission;

[0007] The reinforcing component is at least partially arranged above the auxiliary vibration zone and is configured to at least reflect the ultrasonic wave of the auxiliary vibration zone so that the ultrasonic wave energy intensity on the auxiliary vibration zone approaches the ultrasonic wave energy intensity of the main vibration zone.

[0008] The pole piece manufacturing equipment according to the first aspect of the present application has at least the following beneficial effects:

[0009] The electrode manufacturing equipment of the present application is configured by coordinating the vibration component and the reinforcement component on the conveying path of the current collector. The vibration end of the vibration component forms an ultrasonic sound source, which drives the current collector to perform high-frequency mechanical vibration, so that the area of ​​the first surface facing the vibration end forms a main vibration zone with a higher ultrasonic energy intensity, and the area of ​​the first surface adjacent to the main vibration zone forms an auxiliary vibration zone through vibration transmission. The ultrasonic energy on the main vibration zone and the auxiliary vibration zone promotes the leveling of the electrode active slurry on the first surface. At the same time, the reinforcement component at least reflects the ultrasonic wave of the auxiliary vibration zone, so that the ultrasonic energy intensity on the auxiliary vibration zone approaches the ultrasonic energy intensity of the main vibration zone, and the ultrasonic energy intensity of the auxiliary vibration zone is roughly evenly distributed with the ultrasonic energy intensity of the main vibration zone, so that the current collector can be subjected to the continuous and relatively evenly distributed ultrasonic energy on the main vibration zone and the auxiliary vibration zone during the conveying process, so that the electrode active slurry on the first surface can flow more evenly in the horizontal and vertical directions, reducing the probability of density gradient caused by the vibration energy difference between the main vibration zone and the auxiliary vibration zone, and further improving the coating quality consistency of the wet film electrode.

[0010] In some embodiments of the present application, the reinforcement component includes a first reflection surface directly opposite to the auxiliary vibration zone, the vertical distance L1 between the first reflection surface and the current collector, the distance L2 between the first reflection surface and the vibration end, and along the running direction of the current collector, L1 remains unchanged as L2 increases, or L1 remains unchanged as L2 decreases.

[0011] Such a setting increases the ultrasonic energy intensity in the auxiliary vibration zone, so that the ultrasonic energy intensity in the auxiliary vibration zone approaches the ultrasonic energy intensity in the main vibration zone, and the ultrasonic energy intensity in the auxiliary vibration zone and the ultrasonic energy intensity in the main vibration zone are roughly evenly distributed, so that the collector can be affected by the continuous and relatively evenly distributed ultrasonic energy in the main vibration zone and the auxiliary vibration zone during the tape running process, so that the electrode active slurry on the first surface can flow more evenly in the horizontal and vertical directions, reducing the probability of density gradient caused by the vibration energy difference between the main vibration zone and the auxiliary vibration zone, and further improving the coating quality consistency of the wet film electrode.

[0012] In some embodiments of the present application, there is at least one first position point on the first reflecting surface, and the first position point reflects the ultrasonic wave generated by the vibration of the auxiliary vibration zone to form a first reflected ultrasonic wave. The first reflected ultrasonic wave has the same frequency, amplitude, and opposite propagation direction as the ultrasonic wave generated by the vibration of the auxiliary vibration zone, and forms a resonance.

[0013] With such an arrangement, all ultrasonic waves reflected by the first reflecting surface resonate with all corresponding initial incident waves on the auxiliary vibration zone, increasing the ultrasonic energy intensity on the auxiliary vibration zone so that the ultrasonic energy intensity on the auxiliary vibration zone approaches the ultrasonic energy intensity on the main vibration zone, and the ultrasonic energy intensity on the auxiliary vibration zone and the ultrasonic energy intensity on the main vibration zone are roughly evenly distributed, so that the collector can be affected by the continuous and relatively evenly distributed ultrasonic energy on the main vibration zone and the auxiliary vibration zone during the tape running process, so that the electrode active slurry on the first surface can flow more evenly in the horizontal and vertical directions, reducing the probability of density gradient caused by the difference in vibration energy between the main vibration zone and the auxiliary vibration zone, and further improving the coating quality consistency of the wet film electrode.

[0014] In some embodiments of the present application, the distance D1 between the first position point and the first surface and the wavelength λ of the ultrasonic wave generated by the vibration end satisfy: D1=(n1*λ) / 2, where n1 is an integer.

[0015] Such an arrangement increases the ultrasonic energy intensity in the auxiliary vibration zone, makes the ultrasonic energy intensity in the auxiliary vibration zone approach the ultrasonic energy intensity in the main vibration zone, and makes the ultrasonic energy intensity in the auxiliary vibration zone and the ultrasonic energy intensity in the main vibration zone roughly evenly distributed.

[0016] In some embodiments of the present application, the region of the first surface adjacent to the primary vibration region forms two auxiliary vibration regions through vibration transmission, and along the running direction of the current collector, the two auxiliary vibration regions are respectively located upstream and downstream of the primary vibration region;

[0017] The reinforcing component includes a fifth reflecting surface, and the fifth reflecting surface and the first reflecting surface are respectively opposite to the upstream auxiliary vibration zone and the downstream auxiliary vibration zone. The vertical distance between the fifth reflecting surface and the current collector is L3, and the distance between the fifth reflecting surface and the vibration end is L4. Along the running direction of the current collector, L3 remains unchanged as L4 decreases.

[0018] With such an arrangement, when the current collector travels along the traveling direction, it will successively travel to the auxiliary vibration zone upstream of the main vibration zone, the main vibration zone, and the auxiliary vibration zone downstream of the main vibration zone. The ultrasonic vibration generated by a single vibration end, combined with the standing wave resonance effect formed by the first reflection surface and the fifth reflection surface of the enhanced component on the corresponding auxiliary vibration zone, makes the ultrasonic energy intensity of the above three continuously distributed vibration zones relatively uniform, and there will be no large energy intensity mutation or energy intensity difference. This not only increases the coverage area of ​​the first surface by the stronger ultrasonic energy field, improves the leveling efficiency of the electrode active slurry on the first surface, but also further makes the electrode active slurry on the first surface flow more evenly in the horizontal and vertical directions, further reduces the probability of density gradient caused by the vibration energy difference between the main vibration zone and the auxiliary vibration zone, and further improves the coating quality consistency of the wet film electrode.

[0019] In some embodiments of the present application, L1 is equal to L3.

[0020] Such an arrangement can make the first reflection surface and the fifth reflection surface of the enhanced component reflect the ultrasonic waves of the two auxiliary vibration zones to roughly the same degree, so that the standing wave resonance intensity formed by the two auxiliary vibration zones is basically the same, thereby further making the ultrasonic energy intensity of the main vibration zone relatively uniform with the ultrasonic energy intensity of the two auxiliary vibration zones upstream and downstream thereof, further reducing the probability of density gradient caused by the vibration energy difference between the main vibration zone and the auxiliary vibration zone, and further improving the coating quality consistency of the wet film electrode.

[0021] In some embodiments of the present application, the fifth reflecting surface has at least one fifth position point, and the fifth position point reflects the ultrasonic wave generated by the vibration of the upstream auxiliary vibration zone to form a fifth reflected ultrasonic wave. The fifth reflected ultrasonic wave has the same frequency, the same amplitude, and the opposite propagation direction as the ultrasonic wave generated by the vibration of the upstream auxiliary vibration zone, and forms a resonance.

[0022] With such an arrangement, all ultrasonic waves reflected by the fifth reflecting surface resonate with all corresponding initial incident waves in the upstream auxiliary vibration zone, thereby increasing the ultrasonic energy intensity in the upstream auxiliary vibration zone, and making the ultrasonic energy intensity in the upstream auxiliary vibration zone approach the ultrasonic energy intensity in the main vibration zone. Combined with the enhancing effect of the first reflecting surface on the ultrasonic energy intensity in the downstream auxiliary vibration zone, the ultrasonic energy intensities in the upstream and downstream auxiliary vibration zones and the ultrasonic energy intensity in the main vibration zone are roughly evenly distributed.

[0023] In some embodiments of the present application, the distance D5 between the fifth position point and the first surface and the wavelength λ of the ultrasonic wave generated by the vibration end satisfy: D5=(n5*λ) / 2, where n5 is an integer.

[0024] Such a setting increases the ultrasonic energy intensity in the upstream auxiliary vibration zone R2, so that the ultrasonic energy intensity in the upstream auxiliary vibration zone R2 approaches the ultrasonic energy intensity in the main vibration zone R1, and the ultrasonic energy intensity in the upstream auxiliary vibration zone R2 and the ultrasonic energy intensity in the main vibration zone R1 are roughly evenly distributed.

[0025] In some embodiments of the present application, the reinforcement component also includes a second reflection surface directly opposite to the main vibration zone, the vertical distance between the second reflection surface and the current collector is L5, and the distance between the second reflection surface and the vibration end is L6. Along the running direction of the current collector, L6 first decreases and then increases, L5 remains unchanged, and L5 is greater than L1.

[0026] With such a setting, the ultrasonic energy of the main vibration zone and the auxiliary vibration zone is increased to promote the leveling of the electrode active slurry. At the same time, the total ultrasonic energy after the original ultrasonic energy of the main vibration zone and the resonance energy are superimposed and the total energy after the original ultrasonic energy of the auxiliary vibration zone and the resonance energy are superimposed are closer, thereby making the ultrasonic energy intensity on the auxiliary vibration zone approach the ultrasonic energy intensity of the main vibration zone, and making the ultrasonic energy intensity of the auxiliary vibration zone and the ultrasonic energy intensity of the main vibration zone roughly evenly distributed.

[0027] In some embodiments of the present application, there is at least one second position point on the second reflecting surface, and the second position point reflects the ultrasonic wave generated by the vibration of the main vibration area to form a second reflected ultrasonic wave. The second reflected ultrasonic wave has the same frequency, the same amplitude, and the opposite propagation direction as the ultrasonic wave generated by the vibration of the main vibration area, and forms a resonance.

[0028] Such an arrangement increases the ultrasonic energy in the auxiliary vibration zone to promote the leveling of the electrode active slurry, while making the ultrasonic energy in the main vibration zone and the auxiliary vibration zone tend to be uniform.

[0029] In some embodiments of the present application, the distance D2 between the second position point and the first surface and the wavelength λ of the ultrasonic wave generated by the vibrating end satisfy: D2=(n2*λ) / 2, where n2 is an integer.

[0030] With this arrangement, all ultrasonic waves reflected by the second reflecting surface resonate with all corresponding initial incident waves on the main vibration area, thereby increasing the ultrasonic energy intensity on the main vibration area and improving the leveling effect of the electrode active slurry on the first surface.

[0031] In some embodiments of the present application, along the running direction of the current collector, the auxiliary vibration region is located downstream of the main vibration region, and the reinforcement assembly further includes a third reflection surface, wherein a vertical projection of the third reflection surface relative to the first surface covers at least a portion of a vertical projection of the main vibration region relative to the first surface, and covers a vertical projection of the auxiliary vibration region relative to the first surface;

[0032] A vertical distance L7 between the third reflective surface and the current collector gradually decreases along the running direction of the current collector.

[0033] Such an arrangement can increase the ultrasonic energy intensity in the auxiliary vibration zone, so that the ultrasonic energy intensity in the auxiliary vibration zone approaches the ultrasonic energy intensity in the main vibration zone.

[0034] In some embodiments of the present application, the third reflecting surface has at least one third position point on the area facing the auxiliary vibration zone, and the third position point reflects the ultrasonic wave generated by the vibration of the auxiliary vibration zone to form a third reflected ultrasonic wave. The third reflected ultrasonic wave has the same frequency, the same amplitude, and the opposite propagation direction as the ultrasonic wave generated by the vibration of the auxiliary vibration zone, and forms a resonance.

[0035] Such an arrangement can increase the ultrasonic energy intensity in the auxiliary vibration zone, so that the ultrasonic energy intensity in the auxiliary vibration zone approaches the ultrasonic energy intensity in the main vibration zone.

[0036] In some embodiments of the present application, the distance D3 between the third position point and the first surface and the wavelength λ of the ultrasonic wave generated by the vibrating end satisfy: D3=(n3*λ) / 2, where n3 is an integer.

[0037] In this way, the third reflected ultrasonic wave formed by ultrasonic reflection at the third position point forms a standing wave resonance with the initial ultrasonic wave generated by the vibration of the auxiliary vibration zone.

[0038] In some embodiments of the present application, along the running direction of the current collector, the auxiliary vibration region is located upstream of the main vibration region, and the reinforcement assembly further includes a fourth reflection surface, wherein a vertical projection of the fourth reflection surface relative to the first surface covers at least a portion of a vertical projection of the main vibration region relative to the first surface, and covers a vertical projection of the auxiliary vibration region relative to the first surface;

[0039] A vertical distance L8 between the fourth reflective surface and the current collector gradually increases along the running direction of the current collector.

[0040] With such an arrangement, when the current collector travels along the traveling direction, it will travel in sequence to the auxiliary vibration zone upstream of the main vibration zone and the main vibration zone. The ultrasonic vibration generated by a single vibration end, combined with the standing wave resonance effect formed by the reinforcement component on the auxiliary vibration zone, makes the ultrasonic energy intensity of the above two continuously distributed vibration zones relatively uniform, and there will be no large energy intensity mutation or energy intensity difference. This not only increases the coverage area of ​​the first surface by the stronger ultrasonic energy field, improves the leveling efficiency of the electrode active slurry on the first surface, but also further makes the electrode active slurry on the first surface flow more evenly in the horizontal and vertical directions, further reduces the probability of density gradient caused by the vibration energy difference between the main vibration zone and the auxiliary vibration zone, and further improves the coating quality consistency of the wet film electrode.

[0041] In some embodiments of the present application, the fourth reflecting surface has at least one fourth position point on the area facing the auxiliary vibration zone, and the fourth position point reflects the ultrasonic wave generated by the vibration of the auxiliary vibration zone to form a fourth reflected ultrasonic wave. The fourth reflected ultrasonic wave has the same frequency, the same amplitude, and the opposite propagation direction as the ultrasonic wave generated by the vibration of the auxiliary vibration zone, and forms a resonance.

[0042] Such an arrangement can also increase the ultrasonic energy intensity in the auxiliary vibration area, so that the ultrasonic energy intensity in the auxiliary vibration area approaches the ultrasonic energy intensity in the main vibration area.

[0043] In some embodiments of the present application, the distance D4 between the fourth position point and the first surface and the wavelength λ of the ultrasonic wave generated by the vibration end satisfy: D4=(n4*λ) / 2, where n4 is an integer.

[0044] Such an arrangement increases the ultrasonic energy intensity in the auxiliary vibration zone, so that the ultrasonic energy intensity in the auxiliary vibration zone approaches the ultrasonic energy intensity in the main vibration zone.

[0045] In some embodiments of the present application, the auxiliary vibration zone surrounds the main vibration zone, and the reinforcement assembly includes a sixth reflection surface, wherein a vertical projection of the sixth reflection surface relative to the first surface covers a vertical projection of the main vibration zone and the auxiliary vibration zone relative to the first surface;

[0046] A vertical distance L9 between the sixth reflective surface and the current collector gradually decreases along a direction from the primary vibration region to the auxiliary vibration region.

[0047] Such a setting can also make the ultrasonic energy intensity of the above-mentioned two continuously distributed vibration zones relatively uniform, and there will be no large energy intensity mutation or energy intensity difference. It not only increases the coverage area of ​​the first surface by the ultrasonic energy field with stronger energy, and improves the leveling efficiency of the electrode active slurry on the first surface, but also further makes the electrode active slurry on the first surface flow more evenly in the horizontal and vertical directions, further reduces the probability of density gradient caused by the vibration energy difference between the main vibration zone and the auxiliary vibration zone, and further improves the coating quality consistency of the wet film electrode.

[0048] In some embodiments of the present application, the sixth reflecting surface has at least one sixth position point on the area facing the auxiliary vibration zone, and the sixth position point reflects the ultrasonic wave generated by the vibration of the auxiliary vibration zone to form a sixth reflected ultrasonic wave. The sixth reflected ultrasonic wave has the same frequency, the same amplitude, and the opposite propagation direction as the ultrasonic wave generated by the vibration of the auxiliary vibration zone, and forms a resonance.

[0049] Such an arrangement can also increase the ultrasonic energy intensity in the auxiliary vibration area, so that the ultrasonic energy intensity in the auxiliary vibration area approaches the ultrasonic energy intensity in the main vibration area.

[0050] In some embodiments of the present application, the distance D6 between the sixth position point and the first surface and the wavelength λ of the ultrasonic wave generated by the vibrating end satisfy: D6=(n6*λ) / 2, where n6 is an integer.

[0051] Such an arrangement increases the ultrasonic energy intensity in the auxiliary vibration zone, so that the ultrasonic energy intensity in the auxiliary vibration zone approaches the ultrasonic energy intensity in the main vibration zone.

[0052] In some embodiments, the vibration end is tangent to the second surface, and a width of the vibration end is greater than or equal to a width of the second surface.

[0053] Such a setting can reduce the contact area between the vibrating end and the second surface, reduce the friction effect of the vibrating end on the second surface, and make the current collector move smoothly along the walking direction. In addition, by making the width of the vibrating end greater than or equal to the width of the second surface, the vibration area of ​​the vibrating end in the width direction covers the longitudinal area of ​​the second surface, so that all areas in the longitudinal direction of the second surface are driven to vibrate, further promoting the uniform leveling of the electrode active slurry on the first surface.

[0054] In some embodiments, the electrode manufacturing equipment also includes a coating device and a drying device arranged on the conveying path of the current collector, and the vibration component is arranged between the coating device and the drying device. The coating device is used to coat the electrode active slurry on the first surface, and the drying device is used to dry the electrode active slurry on the first surface.

[0055] In this way, the initial current collector is coated by the coating device to form a wet film electrode. The wet film electrode continues to be conveyed along the conveying direction to the matching position of the vibration component and the reinforcement component. After the ultrasonic energy vibration of the continuously distributed main vibration zone and auxiliary vibration zone promotes leveling, a wet film electrode with high coating quality consistency is formed. The electrode continues to be conveyed to the drying device, and the drying device dries the wet film electrode to obtain a dry electrode. In this way, a electrode with high coating quality consistency is manufactured.

[0056] In a second aspect, the present application provides a battery production system, which includes the above-mentioned electrode manufacturing equipment.

[0057] The battery production system according to the second aspect of the present application has at least the following beneficial effects:

[0058] The battery production system of the present application is equipped with the above-mentioned electrode manufacturing equipment, and therefore also has the same technical effect brought by the electrode manufacturing equipment, that is, it can produce electrodes with high coating quality consistency, which correspondingly improves the consistency of battery capacity.

[0059] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, 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 present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0061] Figure 1 This is a schematic structural diagram of the electrode manufacturing equipment according to an embodiment of the present application.

[0062] Figure 2 Schematic diagram of part of the structure of the electrode manufacturing equipment of the embodiment of the present application Figure 1 .

[0063] Figure 3 Schematic diagram of the matching structure of the current collector, vibration component and reinforcement component in the embodiment of the present application Figure 1 .

[0064] Figure 4 Schematic diagram of the matching structure of the current collector, vibration component and reinforcement component in the embodiment of the present application Figure 2 .

[0065] Figure 5 Schematic diagram of the matching structure of the current collector, vibration component and reinforcement component in the embodiment of the present application Figure 3 .

[0066] Figure 6 Schematic diagram of the matching structure of the current collector, vibration component and reinforcement component in the embodiment of the present application Figure 4 .

[0067] Figure 7 Schematic diagram of the matching structure of the current collector, vibration component and reinforcement component in the embodiment of the present application Figure 5 .

[0068] Figure 8 Schematic diagram of the matching structure of the current collector, vibration component and reinforcement component in the embodiment of the present application Figure 6 .

[0069] Explanation of the reference numerals: vibration component 100; vibration end 110; reinforcement component 200; first reflection plate 210; first reflection surface 211; second reflection plate 220; second reflection surface 221; third reflection plate 230; third reflection surface 231; fourth reflection plate 240; fourth reflection surface 241; fifth reflection plate 250; fifth reflection surface 251; sixth reflection plate 260; sixth reflection surface 261; coating device 300; drying device 400; collector 500; coating area 501; non-coating area 502; first surface 510; second surface 520; tension adjustment device 600; main vibration area R1; auxiliary vibration area R2; first position point P1; second position point P2; third position point P3; fourth position point P4; fifth position point P5; sixth position point P6; tape running direction S. DETAILED DESCRIPTION

[0070] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0071] In the description of this application, it should be understood that if the 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. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply 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 on this application.

[0072] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0073] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0074] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0075] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.

[0076] Currently, market developments indicate that batteries are increasingly being used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. As battery applications continue to expand, market demand is also growing.

[0077] A battery is composed of one or more battery cells. For each battery, the battery cells can be connected in series, in parallel, or in a hybrid connection. Hybrid connection means that the battery cells are connected in both series and parallel.

[0078] A battery cell is the smallest unit of a battery. Its structure includes a housing, electrolyte, and electrode assemblies. The electrode assembly is the component where the electrochemical reaction occurs in the battery cell and includes a positive electrode sheet, a negative electrode sheet, and a separator. The housing may contain one or more electrode assemblies, which are primarily formed by winding or stacking positive and negative electrode sheets, with a separator typically placed between the positive and negative electrodes.

[0079] The shell is a structure with one end open and an interior hollow. The electrode assembly is arranged inside the shell, and the end cover is arranged at the opening of the shell. The internal environment of the battery cell is formed by covering the opening with the end cover. Of course, the end cover and the shell can also be integrated. Specifically, the end cover and the shell can form a common connection surface before other components are put into the shell. When the interior of the shell needs to be encapsulated, the end cover is covered with the shell. The shell can be of various shapes and sizes, such as rectangular, cylindrical, hexagonal, etc. Specifically, the shape of the shell can be determined according to the specific shape and size of the electrode assembly. The material of the shell can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this.

[0080] During the battery production process, the battery pole pieces need to undergo multiple operations, such as coating, cold pressing, die-cutting, winding, etc. Among them, coating means: evenly coating the electrode active slurry (positive / negative electrode slurry) on the surface of the metal current collector, and after drying, the battery pole pieces are formed.

[0081] In related technologies, after a coating device applies electrode active slurry to the surface of a current collector, the current collector becomes a wet-film electrode sheet. The electrode active slurry naturally levels under the action of its own gravity and the surface tension of the current collector, forming a wet-film electrode sheet. However, the electrode active slurry has poor natural leveling ability and consistency, resulting in uneven thickness and uneven mass distribution on the wet-film electrode sheet, resulting in poor coating quality consistency, which in turn leads to poor battery capacity consistency.

[0082] Based on the above situation, in order to solve the problem that the current electrode active slurry has poor natural leveling ability and poor leveling consistency on the surface of the current collector, resulting in poor coating quality consistency of the wet film electrode, one or more embodiments of the present application provide a electrode manufacturing device, through the coordinated arrangement of the vibration component and the enhancement component on the belt path of the current collector, the vibration end of the vibration component forms an ultrasonic sound source, which drives the current collector to perform high-frequency mechanical vibration, so that the area of ​​the first surface facing the vibration end forms a main vibration zone with a higher ultrasonic energy intensity, and the area of ​​the first surface adjacent to the main vibration zone forms an auxiliary vibration zone through vibration transmission, relying on the ultrasonic energy on the main vibration zone and the auxiliary vibration zone. The electrode active slurry is promoted to level on the first surface. At the same time, the ultrasonic wave in the auxiliary vibration zone is reflected at least by the enhancement component, so that the ultrasonic wave energy intensity on the auxiliary vibration zone is close to the ultrasonic wave energy intensity in the main vibration zone, and the ultrasonic wave energy intensity in the auxiliary vibration zone and the ultrasonic wave energy intensity in the main vibration zone are roughly evenly distributed, so that the collector can be affected by the continuous and relatively evenly distributed ultrasonic energy in the main vibration zone and the auxiliary vibration zone during the belt conveying process, so that the electrode active slurry on the first surface can flow more evenly in the horizontal and vertical directions, reduce the probability of density gradient caused by the vibration energy difference between the main vibration zone and the auxiliary vibration zone, and further improve the coating quality consistency of the wet film electrode.

[0083] See also Figure 1 、 Figure 2 and Figure 3 , an embodiment of the present application provides a pole piece manufacturing device, the pole piece manufacturing device includes a vibration component 100 and a reinforcement component 200.

[0084] The vibration component 100 is arranged on the conveying path of the current collector 500. The current collector 500 has a first surface 510 and a second surface 520 opposite to each other along its own thickness direction. The first surface 510 is coated with undried electrode active slurry. The vibration end 110 of the vibration component 100 is arranged on the side close to the second surface 520 of the current collector 500, so that the area directly opposite to the first surface 510 and the vibration end 110 forms a main vibration area R1, and the area adjacent to the first surface 510 and the main vibration area R1 forms an auxiliary vibration area R2 through vibration transmission.

[0085] The reinforcing component 200 is at least partially arranged above the auxiliary vibration zone R2 and is configured to at least reflect the ultrasonic waves in the auxiliary vibration zone R2 so that the ultrasonic energy intensity in the auxiliary vibration zone R2 approaches the ultrasonic energy intensity in the main vibration zone R1.

[0086] It should be noted that see Figure 1The electrode manufacturing equipment of the present application may also include an unwinding device (not shown in the figure), a coating device 300, a drying device 400, a tension adjustment device 600, and a winding device (not shown in the figure). The unwinding device is used to release the uncoated substrate current collector 500 and provide initial tension control. The unwinding device may be an unwinding roller. The coating device 300 is used to apply the electrode active slurry to the first surface 510 of the current collector 500 to evenly coat the electrode active slurry on the first surface 510 to form a wet film electrode. The coating device 300 may be a slit extrusion coating head. The drying device 400 is used to dry the wet electrode active slurry on the wet film electrode, evaporate the solvent in the electrode active slurry, and form a dry electrode. The drying device 400 may be an oven capable of feeding the wet film electrode. The tension adjustment device 600 is used to adjust the tension of the current collector 500 during the conveying process, ensuring that the current collector 500 can be stably conveyed along the conveying path. The tension adjustment device 600 can be a floating roller for the second surface 520 of the current collector 500 to abut or be wound around. The winding device is used to rewind the dried electrode sheet into a roll and provide end tension control. The winding device can be a winding roller.

[0087] In this application, the current collector 500 is an aluminum foil or copper foil with a certain thickness. When the current collector 500 is a positive electrode current collector for manufacturing a positive electrode sheet, the current collector 500 is an aluminum foil. When the current collector 500 is a negative electrode current collector for manufacturing a negative electrode sheet, the current collector 500 is a copper foil.

[0088] It should be noted that see Figure 2 The coated surface of the current collector 500 is divided into a plurality of alternating coated areas 501 and non-coated areas 502 along its width. The coated areas 501 need to be coated with an electrode active slurry, while the non-coated areas 502 are not. Typically, the non-coated areas 502 are used to form the tab structure of the electrode sheet. It is easy to understand that the first surface 510 of the current collector 500 refers to the coated area 501 of the current collector 500, and correspondingly, the second surface 520 of the current collector 500 refers to the area on the non-coated surface of the current collector 500 that overlaps with the projection of the first surface 510.

[0089] In the present application, the vibration component 100 may be an ultrasonic generator that converts electrical energy into mechanical vibrations based on the piezoelectric effect or magnetostrictive effect, thereby generating high-frequency sound waves. The vibration end 110 of the vibration component 100 is the sound source, which emits ultrasonic waves toward the second surface 520 of the current collector 500. The frequency of the ultrasonic waves is greater than 20 kHz.

[0090] See also Figure 3 , Figure 3 The dashed lines with arrows above and below indicate ultrasound waves. Figures 4 to 7Similarly. The vibration end 110 of the vibration component 100 is arranged on the side of the second surface 520 close to the current collector 500, and generates ultrasonic waves through its own vibration, so that the area directly facing the first surface 510 and the vibration end 110 forms a main vibration area R1, and the area adjacent to the first surface 510 and the main vibration area R1 forms an auxiliary vibration area R2 through vibration transmission. It can be understood as follows: when the vibration end 110 of the vibration component 100 vibrates, it is located on the side of the second second surface 520 close to the current collector 500 and emits ultrasonic waves toward the current collector 500. The area directly facing the current collector 500 and the vibration end 110 is driven to vibrate by the periodic force, and the vibration of the current collector 500 drives the air above it to vibrate, so that the first surface 510 and the vibration end 110 are directly facing each other. An ultrasonic vibration energy field is formed in the area, which is the main vibration area R1. When the main vibration area R1 vibrates, the area of ​​the first surface 510 of the current collector 500 near the vibration end 110 is driven to vibrate through the vibration transmission effect of the current collector 500. Similarly, the vibration of the area of ​​the first surface 510 of the current collector 500 near the vibration end 110 drives the air above it to vibrate, so that the area adjacent to the first surface 510 and the vibration end 110 forms an ultrasonic vibration energy field, which is the auxiliary vibration area R2. Because the auxiliary vibration area R2 is farther away from the vibration end 110 than the main vibration area R1, the ultrasonic energy of the auxiliary vibration area R2 is smaller than that of the main vibration area R1 when there is no external interference.

[0091] It should be understood that, in the above description, the area directly opposite the first surface 510 and the vibration end 110 refers to the area directly opposite the first surface 510 and the space directly above the vibration end 110. This area can be understood as an open cylindrical cavity covering the vibration end 110. The vertical projection of the main vibration region R1 relative to the first surface 510 covers the vertical projection of the vibration end 110 relative to the first surface 510. The area enclosed by the portion of the first surface 510 adjacent to the vibration end 110 and the space directly above this adjacent portion is the auxiliary vibration region R2. The vertical projection of the auxiliary vibration region R2 relative to the first surface 510 is offset from the vertical projection of the vibration end 110 relative to the first surface 510. The auxiliary vibration region R2 can also be understood as an open cylindrical cavity that does not cover the vibration end 110. The auxiliary vibration region R2 is adjacent to and connected to the main vibration region R1. Along the running direction S of the current collector 500, the auxiliary vibration region R2 is located upstream or downstream of the main vibration region R1, or the auxiliary vibration region R2 surrounds the main vibration region R1.

[0092] It should be noted that when the ultrasonic waves of the primary vibration region R1 and the auxiliary vibration region R2 propagate on the first surface 510 of the current collector 500, they generate high-frequency pressure fluctuations, creating a local negative pressure region and tiny bubbles on the first surface 510. These tiny bubbles rapidly expand and collapse, generating strong microjets and shear forces. The microjets can destroy agglomerated particles or colloidal structures in the electrode active slurry coated on the first surface 510, reducing local viscosity gradients. Simultaneously, the shear force can reduce the apparent viscosity of the electrode active slurry, allowing the electrode active slurry to flow more easily on the first surface 510 and improving the leveling efficiency of the electrode active slurry on the first surface 510. Furthermore, the high-frequency mechanical vibrations of the ultrasonic waves can simulate shearing, temporarily reducing the viscosity of the electrode active slurry, making it easier for the electrode active slurry to spread under the action of surface tension on the first surface 510, reducing unevenness after coating, and ensuring a uniform distribution of the electrode active slurry on the first surface 510.

[0093] In general, the ultrasonic energy of the main vibration zone R1 on the first surface 510 of the current collector 500 and the auxiliary vibration zone R2 adjacent to the main vibration zone R1 can promote the leveling of the electrode active slurry on the first surface 510, improve the leveling efficiency and leveling consistency of the electrode active slurry on the first surface 510, make the electrode active slurry evenly distributed on the first surface 510, and thereby improve the coating quality consistency of the wet film electrode.

[0094] In the present application, the reinforcing component 200 is at least partially arranged above the auxiliary vibration zone R2, which means that the reinforcing component 200 is at least partially located above the auxiliary vibration zone R2 along the thickness direction of the current collector 500. The reinforcing component 200 at least reflects the ultrasonic wave of the auxiliary vibration zone R2, which means that: in some embodiments, the reinforcing component 200 can reflect the ultrasonic wave propagated by the vibration of the first surface 510 to the auxiliary vibration zone R2, so that the reflected ultrasonic wave and the ultrasonic wave generated by the vibration of the first surface 510 are coherently enhanced. In other words, the ultrasonic wave reflected by the reinforcing component 200 on the auxiliary vibration zone R2 and the original ultrasonic wave on the auxiliary vibration zone R2 will form a standing wave resonance effect on the auxiliary vibration zone R2, thereby increasing the ultrasonic wave energy on the auxiliary vibration zone R2 and making the ultrasonic wave energy on the auxiliary vibration zone R2 approach the ultrasonic wave energy intensity of the main vibration zone R1; in other embodiments, the reinforcing component 2 00 can not only reflect the ultrasonic wave propagated by the vibration of the first surface 510 to the auxiliary vibration area R2, so that the reflected ultrasonic wave and the ultrasonic wave generated by the vibration of the first surface 510 are coherently enhanced in the auxiliary vibration area R2, but also, the enhancement component 200 can also reflect the ultrasonic wave propagated by the vibration of the first surface 510 to the main vibration area R1, so that the reflected ultrasonic wave and the ultrasonic wave generated by the vibration of the first surface 510 are coherently enhanced in the main vibration area R1. By adjusting and controlling the degree of reflection of the ultrasonic waves of the main vibration area R1 and the auxiliary vibration area R2 by the enhancement component 200, the ultrasonic wave energy intensity on the auxiliary vibration area R2 can also be made close to the ultrasonic wave energy intensity of the main vibration area R1.

[0095] In the embodiment of the present application, the reinforcement assembly 200 may be a reflector structure. By properly adjusting parameters such as the ultrasonic frequency and the distance between the reflector structure and the first surface 510 of the current collector 500, the ultrasonic waves reflected by the reflector structure resonate with the ultrasonic waves generated by the vibration of the first surface 510. Of course, in other embodiments, the reinforcement assembly 200 may also be an acoustic lens. By focusing and reflecting the ultrasonic waves through the concave structure of the acoustic lens and properly adjusting the resonance parameters, resonance can also be stimulated.

[0096] According to the above description, it can be understood that by enhancing the reflection effect of the component 200 on the ultrasonic wave of the auxiliary vibration zone R2 and causing the auxiliary vibration zone R2 to form a resonance effect, the ultrasonic energy intensity on the auxiliary vibration zone R2 can be made close to the ultrasonic energy intensity of the main vibration zone R1, that is, the ultrasonic energy intensity of the auxiliary vibration zone R2 and the ultrasonic energy intensity of the main vibration zone R1 are roughly evenly distributed. When the current collector 500 passes through the main vibration zone R1 and the auxiliary vibration zone R2, the electrode active slurry on its first surface 510 can flow more evenly in the horizontal direction (travel direction) and the longitudinal direction (perpendicular to the travel direction), reducing the probability of density gradient caused by the vibration energy difference between the main vibration zone R1 and the auxiliary vibration zone R2, and further improving the coating quality consistency of the wet film electrode.

[0097] The electrode manufacturing equipment of the embodiment of the present application, through the cooperative arrangement of the vibration component 100 and the reinforcement component 200 on the belt path of the current collector 500, the vibration end 110 of the vibration component 100 forms an ultrasonic sound source, which drives the current collector 500 to perform high-frequency mechanical vibration, so that the area of ​​the first surface 510 facing the vibration end 110 forms a main vibration zone R1 with high ultrasonic energy intensity, and the area of ​​the first surface 510 adjacent to the main vibration zone R1 forms an auxiliary vibration zone R2 through vibration transmission, relying on the ultrasonic energy on the main vibration zone R1 and the auxiliary vibration zone R2 to promote the leveling of the electrode active slurry on the first surface 510, and at the same time, through the reinforcement component 200 At least the ultrasonic wave of the auxiliary vibration zone R2 is reflected, so that the ultrasonic wave energy intensity on the auxiliary vibration zone R2 approaches the ultrasonic wave energy intensity of the main vibration zone R1, and the ultrasonic wave energy intensity of the auxiliary vibration zone R2 and the ultrasonic wave energy intensity of the main vibration zone R1 are roughly evenly distributed, so that the collector 500 can be affected by the continuous and relatively evenly distributed ultrasonic energy on the main vibration zone R1 and the auxiliary vibration zone R2 during the tape running process, so that the electrode active slurry on the first surface 510 can flow more evenly in the horizontal and vertical directions, reducing the probability of density gradient caused by the vibration energy difference between the main vibration zone R1 and the auxiliary vibration zone R2, and further improving the coating quality consistency of the wet film electrode.

[0098] It should be noted that, in the present application, the enhancement component 200 readjusts and distributes the sound field energy on the auxiliary vibration zone R2 by at least reflecting the ultrasonic wave of the auxiliary vibration zone R2, and reflects part of the ultrasonic wave radiated outside the auxiliary vibration zone R2 back to the auxiliary vibration zone R2, thereby reducing the ultrasonic wave energy loss of the auxiliary vibration zone R2 and improving the ultrasonic wave energy intensity of the auxiliary vibration zone R2, so that the ultrasonic wave energy intensity of the auxiliary vibration zone R2 is closer to the ultrasonic wave energy intensity of the main vibration zone R1. At the same time, the ultrasonic wave emitted by the vibration end 110 of the vibration component 100 can maintain a relatively large energy intensity and radiate to cover more areas on the first surface 510 of the current collector 500. Through the larger area of ​​ultrasonic energy area, the leveling efficiency of the electrode active slurry on the first surface 510 is improved, thereby improving the coating quality consistency of the wet film electrode.

[0099] In addition, the fact that the ultrasonic energy intensity on the auxiliary vibration zone R2 approaches that of the main vibration zone R1 can be understood as the ultrasonic energy intensity on the auxiliary vibration zone R2 and the ultrasonic energy intensity on the main vibration zone R1 being relatively uniform, and the absolute value of the difference between the two being relatively small. In other words, the absolute value of the difference between the ultrasonic energy intensity on the auxiliary vibration zone R2 and the ultrasonic energy intensity on the main vibration zone R1 is within an acceptable range. When the absolute value of the difference between the ultrasonic energy intensity on the auxiliary vibration zone R2 and the ultrasonic energy intensity on the main vibration zone R1 is within an acceptable range, when the reinforcement component 200 is at least partially arranged in the auxiliary vibration zone R2, by performing a thickness consistency test on the current collector 500 after the vibration leveling treatment of the vibration component 100 and the reinforcement component 200, the leveling of the electrode active slurry on the first surface 510 on the current collector 500 is effectively improved, and the thickness consistency of the current collector 500 meets the process requirements.

[0100] In some embodiments of the present application, the reinforcement component 200 includes a first reflection surface 211 that is opposite to the auxiliary vibration region R2, a vertical distance L1 between the first reflection surface 211 and the current collector 500, and a distance L2 between the first reflection surface 211 and the vibration end 110. Along the running direction S of the current collector 500, L1 remains unchanged as L2 increases, or L1 remains unchanged as L2 decreases.

[0101] Specifically, the vibration end 110 can be understood as a point-shaped or planar vibration source, and the distance L2 between the first reflection surface 211 and the vibration end 110 refers to the distance between a point on the first reflection surface 211 and the geometric center of the vibration end 110 .

[0102] The reinforcement assembly 200 may include a first reflective plate 210, with a first reflective surface 211 disposed on the first reflective plate 210. The first reflective surface 211 is a surface of the first reflective plate 210. It is easy to understand that regardless of how the distance L2 between the first reflective surface 211 and the vibration end 110 changes, the vertical distance L1 between the first reflective surface 211 and the current collector 500 remains constant, ensuring that the first reflective surface 211 and the current collector 500 are parallel to each other.

[0103] Along the running direction S of the current collector 500, the auxiliary vibration region R2 can be located upstream or downstream of the main vibration region R1. Figure 3 When the auxiliary vibration region R2 is located downstream of the main vibration region R1, along the running direction S of the current collector 500, the distance L2 between the first reflection surface 211 and the vibration end 110 gradually increases, while the vertical distance L1 between the first reflection surface 211 and the current collector 500 remains unchanged. When the auxiliary vibration region R2 is located upstream of the main vibration region R1, the distance L2 between the first reflection surface 211 and the vibration end 110 gradually decreases, while the vertical distance L1 between the first reflection surface 211 and the current collector 500 also remains unchanged.

[0104] In the above structure, the first reflection surface 211 and the current collector 500 are parallel to each other, and parameters such as the ultrasonic frequency and L1 are reasonably adjusted so that the ultrasonic wave reflected on the first reflection surface 211 resonates with the ultrasonic wave generated by the vibration of the first surface 510, thereby increasing the ultrasonic wave energy intensity on the auxiliary vibration area R2, and making the ultrasonic wave energy intensity on the auxiliary vibration area R2 approach the ultrasonic wave energy intensity of the main vibration area R1, so that the ultrasonic wave energy intensity of the auxiliary vibration area R2 and the ultrasonic wave energy intensity of the main vibration area R1 are roughly evenly distributed, so that the current collector 500 can be affected by the continuous and relatively evenly distributed ultrasonic energy on the main vibration area R1 and the auxiliary vibration area R2 during the tape running process, so that the electrode active slurry on the first surface 510 can flow more evenly in the horizontal and vertical directions, thereby reducing the probability of density gradient caused by the vibration energy difference between the main vibration area R1 and the auxiliary vibration area R2, and further improving the coating quality consistency of the wet film electrode.

[0105] Further, see Figure 3 There is at least one first position point P1 on the first reflecting surface 211. The first position point P1 reflects the ultrasonic wave generated by the vibration of the auxiliary vibration area R2 to form a first reflected ultrasonic wave. The first reflected ultrasonic wave has the same frequency and amplitude as the ultrasonic wave generated by the vibration of the auxiliary vibration area R2, and the propagation direction is opposite, and resonance is formed.

[0106] It should be noted that the ultrasonic wave generated by the vibration of the auxiliary vibration region R2 refers to the ultrasonic wave formed by the vibration end 110 being transmitted to the auxiliary vibration region R2 through the vibration of the current collector 500 , and can also be understood as the incident ultrasonic wave of the auxiliary vibration region R2 .

[0107] Specifically, taking the example of the auxiliary vibration zone R2 being located downstream of the main vibration zone R1, the first reflection surface 211 faces the auxiliary vibration zone R2, and the vertical projection of the first reflection surface 211 relative to the first surface 510 covers the vertical projection of the auxiliary vibration zone R2 relative to the first surface 510. In this way, the first reflection surface 211 can reflect ultrasonic waves propagating from the auxiliary vibration zone R2 along the thickness direction of the current collector 500.

[0108] Since the vertical distance L1 between the first reflecting surface 211 and the current collector 500 is a constant, any point on the first reflecting surface 211 is a first position point P1. When there is a first position point P1 that meets the resonance condition on the first reflecting surface 211, any point on the first reflecting surface 211 meets the resonance condition.

[0109] The ultrasonic wave reflected by the first position point P1 on the first reflection surface 211 forms a first reflected ultrasonic wave. The first reflected ultrasonic wave has the same frequency and amplitude as the ultrasonic wave generated by the vibration of the auxiliary vibration zone R2, and has an opposite propagation direction, forming a standing wave. By adjusting the excitation frequency of the vibration end 110 of the vibration component 100 and the vertical distance L1 between the first reflection surface 211 and the current collector 500, the standing wave in the auxiliary vibration zone R2 can form a resonance effect.

[0110] It can be understood that all the ultrasonic waves reflected by the first reflecting surface 211 resonate with all the corresponding initial incident waves on the auxiliary vibration zone R2, increasing the ultrasonic energy intensity on the auxiliary vibration zone R2, making the ultrasonic energy intensity on the auxiliary vibration zone R2 close to the ultrasonic energy intensity of the main vibration zone R1, and making the ultrasonic energy intensity of the auxiliary vibration zone R2 and the ultrasonic energy intensity of the main vibration zone R1 roughly evenly distributed, so that the collector 500 can be affected by the continuous and relatively evenly distributed ultrasonic energy on the main vibration zone R1 and the auxiliary vibration zone R2 during the tape running process, so that the electrode active slurry on the first surface 510 can flow more evenly in the horizontal and vertical directions, reducing the probability of density gradient caused by the vibration energy difference between the main vibration zone R1 and the auxiliary vibration zone R2, and further improving the coating quality consistency of the wet film electrode.

[0111] Further, see Figure 3 The distance D1 between the first position point P1 and the first surface 510 and the wavelength λ of the ultrasonic wave generated by the vibration end 110 satisfy: D1=(n1*λ) / 2, where n1 is an integer.

[0112] According to the principle of acoustic wave resonance, when the distance D1 between the first position point P1 and the first surface 510 and the wavelength λ of the ultrasonic wave generated by the vibration end 110 satisfy: D1 = (n1*λ) / 2, where n1 is an integer, the first reflected ultrasonic wave formed by the ultrasonic wave reflection at the first position point P1 forms a standing wave with the original incident ultrasonic wave on the auxiliary vibration area R2 and reaches resonance.

[0113] In this way, the ultrasonic energy intensity on the auxiliary vibration zone R2 is increased, so that the ultrasonic energy intensity on the auxiliary vibration zone R2 approaches the ultrasonic energy intensity of the main vibration zone R1, and the ultrasonic energy intensity of the auxiliary vibration zone R2 and the ultrasonic energy intensity of the main vibration zone R1 are roughly evenly distributed, so that the collector 500 can be affected by the continuous and relatively evenly distributed ultrasonic energy on the main vibration zone R1 and the auxiliary vibration zone R2 during the tape running process, so that the electrode active slurry on the first surface 510 can flow more evenly in the horizontal and vertical directions, reducing the probability of density gradient caused by the vibration energy difference between the main vibration zone R1 and the auxiliary vibration zone R2, and further improving the coating quality consistency of the wet film electrode.

[0114] See also Figure 3 Taking the case where the first reflective surface 211 is parallel to the first surface 510 as an example, the parameter settings of the distance between the first reflective surface 211 and the first surface 510 and the ultrasonic frequency of the vibration end 110 of the vibration assembly 100 are described as follows:

[0115] The propagation speed v of ultrasound in air at room temperature of 25°C is 343 m / s. According to the formula λ=v / f, when the excitation ultrasonic frequency f of the vibration end 110 is set to 20 kHz, the wavelength of the ultrasound generated by the vibration end 110 is λ=v / f=343 / (20*103)=17.15 mm. At this time, the distance D1 between the first reflecting surface 211 and the first surface 510 is set to D1=(n1*λ) / 2=(1*17.15) / 2=8.6 mm, where n1 is 1. When n1 is 2, D1=17.2 mm.

[0116] Similarly, when the ultrasonic frequency f of the vibration end 110 is 30 kHz, 40 kHz, and 50 kHz, respectively, and when n1 is 1, D1 is 5.7 mm, 4.3 mm, and 3.4 mm, respectively.

[0117] It should be noted that in the embodiment of the present application, the ultrasonic frequency f of the vibration end 110 is set to 20kHz≤f≤50kHz. In actual applications, the ultrasonic frequency of the vibration end 110 can be adjusted or a higher-order resonance (n1 greater than or equal to 2) can be selected based on factors such as the actual thickness of the current collector 500, the propagation speed of the ultrasonic wave within the electrode active slurry, and the equipment process distance limit. Furthermore, during the running of the current collector 500, a corresponding detection device can be installed at the end of the running path. This detection device is used to detect the thickness uniformity of the current collector 500. The degree of thickness uniformity of the end current collector 500 is used to provide feedback on the coating quality consistency of the wet film electrode sheet. Based on the coating quality consistency of the wet film electrode sheet, the ultrasonic frequency f of the vibration end 110 and / or the distance between the first reflective surface 211 and the first surface 510 can be dynamically adjusted to improve the leveling of the electrode active slurry on the first surface 510.

[0118] Further, see Figure 4 The area adjacent to the main vibration region R1 on the first surface 510 forms two auxiliary vibration regions R2 through vibration transmission. Along the running direction S of the current collector 500 , the two auxiliary vibration regions R2 are respectively located upstream and downstream of the main vibration region R1 .

[0119] The reinforcement component 200 includes a fifth reflection surface 251. The fifth reflection surface 251 and the first reflection surface 211 are respectively opposite to the upstream auxiliary vibration zone R2 and the downstream auxiliary vibration zone R2. The vertical distance L3 between the fifth reflection surface 251 and the current collector 500 and the distance L4 between the fifth reflection surface 251 and the vibration end 110 are, along the running direction S of the current collector 500, L3 remains unchanged as L4 decreases.

[0120] It can be understood that the distance L4 between the fifth reflective surface 251 and the vibration end 110 refers to the distance between a point on the fifth reflective surface 251 and the geometric center of the vibration end 110 .

[0121] For the first reflective surface 211 , along the running direction S of the current collector 500 , L1 remains unchanged as L2 increases; for the fifth reflective surface 251 , along the running direction S of the current collector 500 , L3 remains unchanged as L4 decreases.

[0122] See also Figure 4 The reinforcing assembly 200 may include a fifth reflective plate 250, and a fifth reflective surface 251 is provided on the fifth reflective plate 250. The fifth reflective surface 251 is a surface of the fifth reflective plate 250. It is easy to understand that no matter how the distances between the first reflective surface 211 and the fifth reflective surface 251 and the vibration end 110 change, the vertical distance L1 between the first reflective surface 211 and the current collector 500 and the vertical distance L5 between the fifth reflective surface 251 and the current collector 500 are both constant values, and the first reflective surface 211 and the fifth reflective surface 251 are both parallel to the current collector 500.

[0123] It is understood that the primary vibration region R1 is located between and connected to the two auxiliary vibration regions R2. The reinforcement assembly 200 is capable of reflecting ultrasonic waves from all of the auxiliary vibration regions R2 and causing the reflected ultrasonic waves to resonate with the ultrasonic waves generated by the vibration of the first surface 510 in the corresponding auxiliary vibration region R2. This ensures that the ultrasonic energy of the primary vibration region R1 is similar to that of the auxiliary vibration regions R2 adjacent upstream and downstream thereof.

[0124] In this way, when the current collector 500 travels along the traveling direction S, it will travel in sequence to the auxiliary vibration zone R2 upstream of the main vibration zone R1, the main vibration zone R1, and the auxiliary vibration zone R2 downstream of the main vibration zone R1. The ultrasonic vibration generated by the single vibration end 110, combined with the standing wave resonance effect formed by the first reflection surface 211 and the fifth reflection surface 251 of the reinforcement component 200 on the corresponding auxiliary vibration zone R2, makes the ultrasonic energy intensity of the above three continuously distributed vibration zones relatively uniform, and there will be no large energy intensity mutation or energy intensity difference. This not only increases the coverage area of ​​the first surface 510 by the stronger ultrasonic energy field, improves the leveling efficiency of the electrode active slurry on the first surface 510, but also further makes the electrode active slurry on the first surface 510 flow more evenly in the horizontal and vertical directions, further reduces the probability of density gradient caused by the vibration energy difference between the main vibration zone R1 and the auxiliary vibration zone R2, and further improves the coating quality consistency of the wet film electrode.

[0125] Further, see Figure 4 , L1 equals L3.

[0126] That is, the vertical distance L3 between the fifth reflective surface 251 and the current collector 500 is the same as the vertical distance L1 between the first reflective surface 211 and the current collector 500 .

[0127] Exemplarily, the fifth reflecting surface 251 and the first reflecting surface 211 are symmetrically distributed relative to the vibration end 110 .

[0128] By setting the vertical distance L1 between the first reflection surface 211 and the current collector 500 and the vertical distance L5 between the fifth reflection surface 251 and the current collector 500 to be equal, the first reflection surface 211 and the fifth reflection surface 251 of the enhancement component 200 can reflect the ultrasonic waves of the two auxiliary vibration zones R2 to roughly the same degree, so that the standing wave resonance intensity formed by the two auxiliary vibration zones R2 is basically the same, thereby further making the ultrasonic energy intensity of the main vibration zone R1 and the ultrasonic energy intensity of the two auxiliary vibration zones R2 upstream and downstream thereof relatively uniform, further reducing the probability of density gradient caused by the vibration energy difference between the main vibration zone R1 and the auxiliary vibration zone R2, and further improving the coating quality consistency of the wet film electrode.

[0129] Further, see Figure 4 The fifth reflecting surface 251 has at least one fifth position point P5. The fifth position point P5 reflects the ultrasonic wave generated by the vibration of the upstream auxiliary vibration zone R2 to form a fifth reflected ultrasonic wave. The fifth reflected ultrasonic wave has the same frequency and amplitude as the ultrasonic wave generated by the vibration of the upstream auxiliary vibration zone R2, and has an opposite propagation direction, and forms resonance.

[0130] Since the vertical distance L3 between the fifth reflecting surface 251 and the current collector 500 is a constant, any point on the fifth reflecting surface 251 is the fifth position point P5. When there is a fifth position point P5 that meets the resonance condition on the fifth reflecting surface 251, any point on the fifth reflecting surface 251 meets the resonance condition.

[0131] The ultrasonic wave reflected by the fifth position point P5 on the fifth reflecting surface 251 forms a fifth reflected ultrasonic wave. The fifth reflected ultrasonic wave has the same frequency, the same amplitude, and the opposite propagation direction as the ultrasonic wave generated by the vibration of the auxiliary vibration zone R2, forming a standing wave. By adjusting the excitation frequency of the vibration end 110 of the vibration component 100 and the vertical distance L3 between the fifth position point P5 and the current collector 500, the standing wave in the upstream auxiliary vibration zone R2 can form a resonance effect.

[0132] It can be understood that all the ultrasonic waves reflected by the fifth reflecting surface 251 resonate with all the corresponding initial incident waves on the upstream auxiliary vibration zone R2, increasing the ultrasonic energy intensity on the upstream auxiliary vibration zone R2, so that the ultrasonic energy intensity on the upstream auxiliary vibration zone R2 approaches the ultrasonic energy intensity of the main vibration zone R1. Combined with the enhancing effect of the first reflecting surface 211 on the ultrasonic energy intensity of the downstream auxiliary vibration zone R2, the ultrasonic energy intensity of the upstream and downstream auxiliary vibration zones R2 and the ultrasonic energy intensity of the main vibration zone R1 are roughly evenly distributed, so that the collector 500 can be affected by the continuous and relatively evenly distributed ultrasonic energy on the main vibration zone R1 and the upstream and downstream auxiliary vibration zones R2 during the tape running process, so that the electrode active slurry on the first surface 510 can flow more evenly in the horizontal and vertical directions, reducing the probability of density gradient caused by the vibration energy difference between the main vibration zone R1 and the auxiliary vibration zone R2, and further improving the coating quality consistency of the wet film electrode.

[0133] Further, see Figure 4 The distance D5 between the fifth position point P5 and the first surface 510 and the wavelength λ of the ultrasonic wave generated by the vibration end 110 satisfy: D5=(n5*λ) / 2, where n5 is an integer.

[0134] According to the principle of acoustic wave resonance, when the distance D5 between the fifth position point P5 and the first surface 510 and the wavelength λ of the ultrasonic wave generated by the vibration end 110 satisfy: D5=(n5*λ) / 2, where n5 is an integer, the fifth reflected ultrasonic wave formed by the ultrasonic wave reflection at the fifth position point P5 forms a standing wave with the original incident ultrasonic wave on the upstream auxiliary vibration area R2 and reaches resonance.

[0135] In this way, the ultrasonic energy intensity on the upstream auxiliary vibration zone R2 is increased, so that the ultrasonic energy intensity on the upstream auxiliary vibration zone R2 approaches the ultrasonic energy intensity of the main vibration zone R1, and the ultrasonic energy intensity of the upstream auxiliary vibration zone R2 and the ultrasonic energy intensity of the main vibration zone R1 are roughly evenly distributed, so that the collector 500 can be affected by the continuous and relatively evenly distributed ultrasonic energy on the main vibration zone R1 and the upstream auxiliary vibration zone R2 during the tape running process, so that the electrode active slurry on the first surface 510 can flow more evenly in the horizontal and vertical directions, reducing the probability of density gradient caused by the vibration energy difference between the main vibration zone R1 and the upstream auxiliary vibration zone R2, and further improving the coating quality consistency of the wet film electrode.

[0136] In some embodiments of this application, see Figure 5 The enhancement component 200 also includes a second reflection surface 221 that is opposite to the main vibration area R1. The vertical distance L5 between the second reflection surface 221 and the current collector 500, and the distance L6 between the second reflection surface 221 and the vibration end 110, along the running direction S of the current collector 500, L6 first decreases and then increases, L5 remains unchanged, and L5 is greater than L1.

[0137] Specifically, the reinforcement assembly 200 may include a second reflective plate 220, with a second reflective surface 221 disposed on the second reflective plate 220. The second reflective surface 221 is a surface of the second reflective plate 220. The vibration end 110 can be understood as a point-shaped or planar vibration source, and the distance L6 between the second reflective surface 221 and the vibration end 110 refers to the distance between a point on the second reflective surface 221 and the geometric center of the vibration end 110.

[0138] It is easy to understand that no matter how the distance L6 between the second reflective surface 221 and the vibration end 110 changes, the vertical distance L5 between the second reflective surface 221 and the current collector 500 is constant, so that the second reflective surface 221 and the current collector 500 are parallel to each other.

[0139] Along the running direction S of the current collector 500, L6 first decreases and then increases. This can be understood as follows: the point on the second reflective surface 221 that is directly opposite the geometric center of the vibration end 110 is defined as the facing point P0. On the second reflective surface 221, the distance between the facing point P0 and the vibration end 110 is the smallest, that is, L6 is the smallest at this time. From the facing point P0 toward the end point of the second reflective surface 221, L6 gradually increases. The line connecting the facing point P0 and the geometric center of the vibration end 110 is defined as the first reference line X1. The second reflective surface 221 is axisymmetric relative to the first reference line X1.

[0140] The second reflective surface 221 faces the main vibration region R1 . The vertical projection of the second reflective surface 221 relative to the first surface 510 covers the vertical projection of the main vibration region R1 relative to the first surface 510 . In this way, the second reflective surface 221 can reflect ultrasonic waves propagating from the main vibration region R1 along the thickness direction of the current collector 500 .

[0141] In this way, the ultrasonic energy intensity in the main vibration region R1 can be appropriately increased.

[0142] Furthermore, it should be noted that the further the ultrasonic wave propagates along the thickness direction of the current collector 500, the greater its energy loss, and the farther it is from the vibration end 110, the weaker the vibration of the current collector 500. Based on this, by setting the vertical distance L5 between the second reflection surface 221 and the current collector 500 to be greater than the vertical distance L1 between the first reflection surface 211 and the current collector 500, when at least one point on each of the first reflection surface 211 and the second reflection surface 221 satisfies the standing wave resonance condition, the ultrasonic wave energy reflected by the second reflection surface 221 is lower than the ultrasonic wave energy reflected by the first reflection surface 211, and the resonant energy in the main vibration region R1 is lower than the resonant energy in the auxiliary vibration region R2. Furthermore, because the auxiliary vibration region R2 is farther away from the vibration end 110 than the main vibration region R1, the original ultrasonic wave energy (excluding the resonant energy) in the auxiliary vibration region R2 is lower than the original ultrasonic wave energy in the main vibration region R1.

[0143] In this way, while increasing the ultrasonic energy of the main vibration zone R1 and the auxiliary vibration zone R2 to promote the leveling of the electrode active slurry, the total ultrasonic energy after the original ultrasonic energy of the main vibration zone R1 and the resonance energy are superimposed and the total energy after the original ultrasonic energy of the auxiliary vibration zone R2 and the resonance energy are superimposed is closer, thereby making the ultrasonic energy intensity on the auxiliary vibration zone R2 approach the ultrasonic energy intensity of the main vibration zone R1, and making the ultrasonic energy intensity of the auxiliary vibration zone R2 and the ultrasonic energy intensity of the main vibration zone R1 roughly evenly distributed, so that the collector 500 can be affected by the continuous and relatively evenly distributed ultrasonic energy on the main vibration zone R1 and the auxiliary vibration zone R2 during the tape running process, so that the electrode active slurry on the first surface 510 can flow more evenly in the horizontal and vertical directions, reducing the probability of density gradient caused by the vibration energy difference between the main vibration zone R1 and the auxiliary vibration zone R2, and further improving the coating quality consistency of the wet film electrode.

[0144] Further, see Figure 5 There is at least one second position point P2 on the second reflecting surface 221. The second position point P2 reflects the ultrasonic wave generated by the vibration of the main vibration area R1 to form a second reflected ultrasonic wave. The second reflected ultrasonic wave has the same frequency and amplitude as the ultrasonic wave generated by the vibration of the main vibration area R1, and the propagation direction is opposite, and resonance is formed.

[0145] Since the vertical distance L5 between the second reflecting surface 221 and the current collector 500 is a constant, any point on the second reflecting surface 221 is the second position point P2. When there is a second position point P2 that meets the resonance condition on the second reflecting surface 221, any point on the second reflecting surface 221 meets the resonance condition.

[0146] The ultrasonic wave reflected by the second position point P2 on the second reflecting surface 221 forms a second reflected ultrasonic wave. The second reflected ultrasonic wave has the same frequency, amplitude and opposite propagation direction as the ultrasonic wave generated by the vibration of the auxiliary vibration zone R2, forming a standing wave. By adjusting the excitation frequency of the vibration end 110 of the vibration component 100 and the vertical distance L5 between the second position point P2 and the current collector 500, the standing wave in the upstream auxiliary vibration zone R2 can form a resonance effect.

[0147] In this way, the ultrasonic energy in the auxiliary vibration zone R2 is increased to promote the leveling of the electrode active slurry, while making the ultrasonic energy intensity in the main vibration zone R1 and the auxiliary vibration zone R2 tend to be uniform.

[0148] Further, see Figure 5 The distance D2 between the second position point P2 and the first surface 510 and the wavelength λ of the ultrasonic wave generated by the vibration end 110 satisfy: D2=(n2*λ) / 2, where n2 is an integer.

[0149] Similarly, according to the principle of acoustic wave resonance, when the distance D2 between the second position point P2 and the first surface 510 and the wavelength λ of the ultrasonic wave generated by the vibration end 110 satisfy: D2 = (n2*λ) / 2, and n2 is an integer, that is, when D2 is equal to an integer multiple of half the wavelength, the second reflected ultrasonic wave formed by the ultrasonic wave reflection at the second position point P2 forms a standing wave with the original incident ultrasonic wave on the main vibration area R1 and reaches resonance.

[0150] Furthermore, because the vertical distance L5 between the second reflective surface 221 and the current collector 500 is constant, any position on the second reflective surface is spaced uniformly from the first surface 510. This means that any point on the second reflective surface 221 corresponds to the aforementioned second point P2. In other words, the distance D2 between any point on the second reflective surface 221 and the first surface 510 and the wavelength λ of the ultrasonic wave generated by the vibration end 110 both satisfy the following equation: D2 = (n2 * λ) / 2, where n2 is an integer. This allows all ultrasonic waves reflected from the second reflective surface 221 to resonate with all corresponding initial incident waves on the main vibration region R1, increasing the ultrasonic wave energy intensity on the main vibration region R1 and improving the leveling effect of the electrode active slurry on the first surface 510.

[0151] Likewise, see Figure 5Taking the second reflective surface 221 and the first surface 510 as an example, the distance between the second reflective surface 221 and the first surface 510 and the ultrasonic frequency of the vibration end 110 of the vibration component 100 are described as follows:

[0152] The propagation speed v of ultrasound in air at room temperature of 25°C is 343 m / s. According to the formula λ=v / f, when the excitation ultrasonic frequency f of the vibration end 110 is set to 20 kHz, the wavelength of the ultrasound generated by the vibration end 110 is λ=v / f=343 / (20*103)=17.15 mm. At this time, the distance D2 between the second reflecting surface 221 and the first surface 510 is set to D2=(n2*λ) / 2=(1*17.15) / 2=8.6 mm. When n2 is 2, D2=17.2 mm, and when n2 is 3, D2=25.7 mm.

[0153] Similarly, when the ultrasonic frequency f of the vibration end 110 is 30 kHz, 40 kHz, and 50 kHz, respectively, and when n2 is 2, D1 is correspondingly 11.4 mm, 8.6 mm, and 6.8 mm, respectively.

[0154] In some embodiments of this application, see Figure 6 Along the running direction S of the current collector 500, the auxiliary vibration zone R2 is located downstream of the main vibration zone R1. The reinforcement component 200 further includes a third reflection surface 231. The vertical projection of the third reflection surface 231 relative to the first surface 510 covers at least part of the vertical projection of the main vibration zone R1 relative to the first surface 510, and covers the vertical projection of the auxiliary vibration zone R2 relative to the first surface 510. The vertical distance L7 between the third reflection surface 231 and the current collector 500 gradually decreases along the running direction S of the current collector 500.

[0155] Specifically, the reinforcing assembly 200 may include a third reflective plate 230, and a third reflective surface 231 is provided on the third reflective plate 230, and the third reflective surface 231 is a surface of the third reflective plate 230. Exemplarily, the third reflective plate 230 is a flat plate tilted relative to the current collector 500, or the third reflective plate 230 is a curved plate tilted relative to the current collector 500.

[0156] In this embodiment, when the current collector 500 travels along the travel direction S, it travels sequentially to the main vibration region R1 and the auxiliary vibration region R2 downstream of the main vibration region R1. Through the ultrasonic vibration generated by the single vibration end 110, combined with the ultrasonic energy enhancement effect of the third reflection surface 231 on the main vibration region R1 and the auxiliary vibration region R2, the vertical distance L7 between the third reflection surface 231 and the current collector 500 is set to gradually decrease along the travel direction S of the current collector 500, so that the ultrasonic energy enhancement effect of the third reflection surface 231 on the auxiliary vibration region R2 is greater than the ultrasonic energy enhancement effect of the third reflection surface 231 on the main vibration region R1. The enhancement effect makes the ultrasonic energy intensity of the above-mentioned two continuously distributed vibration zones relatively uniform, and there will be no large energy intensity mutation or energy intensity difference. It not only increases the coverage area of ​​the first surface 510 by the ultrasonic energy field with stronger energy, and improves the leveling efficiency of the electrode active slurry on the first surface 510, but also further makes the electrode active slurry on the first surface 510 flow more evenly in the horizontal and vertical directions, further reduces the probability of density gradient caused by the vibration energy difference between the main vibration zone R1 and the auxiliary vibration zone R2, and further improves the coating quality consistency of the wet film electrode.

[0157] Further, see Figure 6 The third reflecting surface 231 has at least one third position point P3 in the area facing the auxiliary vibration zone R2. The third position point P3 reflects the ultrasonic wave generated by the vibration of the auxiliary vibration zone R2 to form a third reflected ultrasonic wave. The third reflected ultrasonic wave has the same frequency and amplitude as the ultrasonic wave generated by the vibration of the auxiliary vibration zone R2, and has an opposite propagation direction, and forms resonance.

[0158] It should be noted that the area directly opposite the auxiliary vibration region R2 by the third reflective surface 231 refers to the area where the perpendicular projection of the third reflective surface 231 relative to the first surface 510 overlaps with the perpendicular projection of the auxiliary vibration region R2 relative to the first surface 510. The same applies to the area directly opposite the main vibration region R1 by the third reflective surface 231. The ultrasonic wave generated by the vibration of the auxiliary vibration region R2 refers to the ultrasonic wave generated by the vibration of the vibration end 110 transmitted to the auxiliary vibration region R2 through the vibration of the current collector 500, and can also be understood as the incident ultrasonic wave on the auxiliary vibration region R2.

[0159] The ultrasonic wave reflected by the third position point P3 on the third reflecting surface 231 forms a third reflected ultrasonic wave. The third reflected ultrasonic wave has the same frequency, the same amplitude, and the opposite propagation direction as the ultrasonic wave generated by the vibration of the auxiliary vibration area R2, forming a standing wave. By adjusting the excitation frequency of the vibration end 110 of the vibration component 100 and the distance between the third position point P3 and the first surface 510, the standing wave in the auxiliary vibration area R2 can form a resonance effect.

[0160] In this way, the ultrasonic energy intensity in the auxiliary vibration region R2 can also be increased, so that the ultrasonic energy intensity in the auxiliary vibration region R2 approaches the ultrasonic energy intensity in the main vibration region R1.

[0161] Further, see Figure 6 The distance D3 between the third position point P3 and the first surface 510 and the wavelength λ of the ultrasonic wave generated by the vibration end 110 satisfy: D3=(n3*λ) / 2, where n3 is an integer.

[0162] According to the principle of acoustic wave resonance, when the distance D3 between the third position point P3 and the first surface 510 and the wavelength λ of the ultrasonic wave generated by the vibration end 110 satisfy: D3 = (n3*λ) / 2, and n3 is an integer, that is, when D3 is equal to an integer multiple of half the wavelength, the third reflected ultrasonic wave formed by the ultrasonic wave reflection at the third position point P3 forms a standing wave with the original incident ultrasonic wave on the auxiliary vibration area R2 and reaches resonance.

[0163] In this way, the ultrasonic energy intensity in the auxiliary vibration region R2 is increased, so that the ultrasonic energy intensity in the auxiliary vibration region R2 approaches the ultrasonic energy intensity in the main vibration region R1.

[0164] In some embodiments of this application, see Figure 7 Along the running direction S of the current collector 500, the auxiliary vibration zone R2 is located upstream of the main vibration zone R1. The enhancement component 200 further includes a fourth reflection surface 241. The vertical projection of the fourth reflection surface 241 relative to the first surface 510 covers at least part of the vertical projection of the main vibration zone R1 relative to the first surface 510, and covers the vertical projection of the auxiliary vibration zone R2 relative to the first surface 510. The vertical distance L8 between the fourth reflection surface 241 and the current collector 500 gradually increases along the running direction S of the current collector 500.

[0165] Specifically, the reinforcing assembly 200 may include a fourth reflective plate 240, and a fourth reflective surface 241 is provided on the fourth reflective plate 240, where the fourth reflective surface 241 is a surface of the fourth reflective plate 240. Exemplarily, the fourth reflective plate 240 is a flat plate tilted relative to the current collector 500, or the fourth reflective plate 240 is a curved plate tilted relative to the current collector 500.

[0166] When the current collector 500 travels along the travel direction S, it will travel in sequence to the auxiliary vibration zone R2 upstream of the main vibration zone R1 and the main vibration zone R1. The ultrasonic vibration generated by the single vibration end 110, combined with the standing wave resonance effect formed by the reinforcement component 200 on the auxiliary vibration zone R2, makes the ultrasonic energy intensity of the above two continuously distributed vibration zones relatively uniform, and there will be no large energy intensity mutation or energy intensity difference. This not only increases the coverage area of ​​the first surface 510 by the stronger ultrasonic energy field and improves the leveling efficiency of the electrode active slurry on the first surface 510, but also further makes the electrode active slurry on the first surface 510 flow more evenly in the horizontal and vertical directions, further reduces the probability of density gradient caused by the vibration energy difference between the main vibration zone R1 and the auxiliary vibration zone R2, and further improves the coating quality consistency of the wet film electrode.

[0167] Further, see Figure 7 The fourth reflecting surface 241 has at least one fourth position point P4 in the area facing the auxiliary vibration zone R2. The fourth position point P4 reflects the ultrasonic wave generated by the vibration of the auxiliary vibration zone R2 to form a fourth reflected ultrasonic wave. The fourth reflected ultrasonic wave has the same frequency and amplitude as the ultrasonic wave generated by the vibration of the auxiliary vibration zone R2, and has an opposite propagation direction, and forms a resonance.

[0168] It should be noted that the area directly opposite the auxiliary vibration region R2 by the fourth reflective surface 241 refers to the area where the perpendicular projection of the fourth reflective surface 241 relative to the first surface 510 overlaps with the perpendicular projection of the auxiliary vibration region R2 relative to the first surface 510. The same applies to the area directly opposite the main vibration region R1 by the fourth reflective surface 241. The ultrasonic wave generated by the vibration of the auxiliary vibration region R2 refers to the ultrasonic wave generated by the vibration of the vibration end 110 transmitted to the auxiliary vibration region R2 through the vibration of the current collector 500, and can also be understood as the incident ultrasonic wave on the auxiliary vibration region R2.

[0169] The ultrasonic wave reflected by the fourth position point P4 on the fourth reflection surface 241 forms a fourth reflected ultrasonic wave. The fourth reflected ultrasonic wave has the same frequency, the same amplitude, and the opposite propagation direction as the ultrasonic wave generated by the vibration of the auxiliary vibration area R2, forming a standing wave. By adjusting the excitation frequency of the vibration end 110 of the vibration component 100 and the distance between the fourth position point P4 and the first surface 510, the standing wave in the auxiliary vibration area R2 can form a resonance effect.

[0170] In this way, the ultrasonic energy intensity in the auxiliary vibration region R2 can also be increased, so that the ultrasonic energy intensity in the auxiliary vibration region R2 approaches the ultrasonic energy intensity in the main vibration region R1.

[0171] Further, see Figure 7 The distance D4 between the fourth position point P4 and the first surface 510 and the wavelength λ of the ultrasonic wave generated by the vibration end 110 satisfy: D4=(n4*λ) / 2, where n4 is an integer.

[0172] According to the principle of acoustic wave resonance, when the distance D4 between the fourth position point P4 and the first surface 510 and the wavelength λ of the ultrasonic wave generated by the vibration end 110 satisfy: D4=(n4*λ) / 2, and n4 is an integer, that is, when D4 is equal to an integer multiple of half the wavelength, the fourth reflected ultrasonic wave formed by the ultrasonic wave reflection at the fourth position point P4 forms a standing wave with the original incident ultrasonic wave on the auxiliary vibration area R2 and reaches resonance.

[0173] In this way, the ultrasonic energy intensity in the auxiliary vibration region R2 is increased, so that the ultrasonic energy intensity in the auxiliary vibration region R2 approaches the ultrasonic energy intensity in the main vibration region R1.

[0174] In some embodiments of this application, see Figure 8 The auxiliary vibration zone R2 surrounds the main vibration zone R1, and the enhancement component 200 includes a sixth reflection surface 261. The vertical projection of the sixth reflection surface 261 relative to the first surface 510 covers the vertical projections of the main vibration zone R1 and the auxiliary vibration zone R2 relative to the first surface 510; the vertical distance L9 between the sixth reflection surface 261 and the current collector 500 gradually decreases along the direction from the main vibration zone R1 to the auxiliary vibration zone R2.

[0175] Specifically, the reinforcing assembly 200 may include a sixth reflective plate 260 , and a sixth reflective surface 261 is provided on the sixth reflective plate 260 . The sixth reflective surface 261 is a surface of the sixth reflective plate 260 .

[0176] Exemplarily, both the main vibration region R1 and the auxiliary vibration region R2 are ring-shaped, and their axes coincide with each other, and the main vibration region R1 and the auxiliary vibration region R2 are connected.

[0177] The sixth reflecting surface 261 has an arch shape, an arc shape, a cone shape, or the like.

[0178] There is a highest point Pmax on the sixth reflective surface 261, which is directly opposite the geometric center of the vibration end 110. On the sixth reflective surface 261, the vertical distance L9 between the highest point Pmax and the current collector 500 reaches its maximum. From the highest point Pmax toward the periphery of the sixth reflective surface 261, L9 gradually decreases.

[0179] A line connecting the highest point Pmax and the geometric center of the vibration end 110 is defined as a second reference line X2 , and the sixth reflective surface 261 is axially symmetrical with respect to the second reference line X2 .

[0180] In the above structure, the sixth reflective surface 261's reflection of ultrasound waves can enhance the ultrasonic energy within the primary vibration region R1 and the auxiliary vibration region R2. Furthermore, the vertical distance L9 between the sixth reflective surface 261 and the current collector 500 is configured to gradually decrease from the primary vibration region R1 toward the auxiliary vibration region R2. This reduces the ultrasonic energy enhancement effect of the sixth reflective surface 261 as it approaches the center of the primary vibration region R1. This allows the initial ultrasonic energy in the auxiliary vibration region R2 to be less than that in the primary vibration region R1. This also ensures relatively uniform ultrasonic energy intensities within the two continuously distributed vibration regions, preventing significant energy intensity abrupt changes or variations. This not only increases the coverage area of ​​the high-energy ultrasonic energy field on the first surface 510, improving the leveling efficiency of the electrode active slurry on the first surface 510, but also further ensures more uniform flow of the electrode active slurry on the first surface 510 in both the horizontal and vertical directions. This further reduces the probability of density gradients caused by the difference in vibration energy between the primary vibration region R1 and the auxiliary vibration region R2, thereby further improving the coating quality consistency of the wet film electrode sheet.

[0181] Further, see Figure 8 The sixth reflecting surface 261 has at least one sixth position point P6 in the area facing the auxiliary vibration zone R2. The sixth position point P6 reflects the ultrasonic wave generated by the vibration of the auxiliary vibration zone R2 to form a sixth reflected ultrasonic wave. The sixth reflected ultrasonic wave has the same frequency and amplitude as the ultrasonic wave generated by the vibration of the auxiliary vibration zone R2, and has an opposite propagation direction, and forms a resonance.

[0182] It should be noted that the area directly opposite the auxiliary vibration region R2 by the sixth reflective surface 261 refers to the area where the perpendicular projection of the sixth reflective surface 261 relative to the first surface 510 overlaps with the perpendicular projection of the auxiliary vibration region R2 relative to the first surface 510. The same applies to the area directly opposite the main vibration region R1 by the sixth reflective surface 261. The ultrasonic wave generated by the vibration of the auxiliary vibration region R2 refers to the ultrasonic wave generated by the vibration of the vibration end 110 transmitted to the auxiliary vibration region R2 through the vibration of the current collector 500, and can also be understood as the incident ultrasonic wave on the auxiliary vibration region R2.

[0183] The ultrasonic wave reflected by the sixth position point P6 on the sixth reflection surface 261 forms a sixth reflected ultrasonic wave. The sixth reflected ultrasonic wave has the same frequency and amplitude as the ultrasonic wave generated by the vibration of the auxiliary vibration area R2, and has an opposite propagation direction, forming a standing wave. By adjusting the excitation frequency of the vibration end 110 of the vibration component 100 and the distance between the sixth position point P6 and the first surface 510, the standing wave in the auxiliary vibration area R2 can form a resonance effect.

[0184] In this way, the ultrasonic energy intensity in the auxiliary vibration region R2 can also be increased, so that the ultrasonic energy intensity in the auxiliary vibration region R2 approaches the ultrasonic energy intensity in the main vibration region R1.

[0185] Further, see Figure 8The distance D6 between the sixth position point P6 and the first surface 510 and the wavelength λ of the ultrasonic wave generated by the vibration end 110 satisfy: D6=(n6*λ) / 2, where n6 is an integer.

[0186] According to the principle of acoustic wave resonance, when the distance D6 between the sixth position point P6 and the first surface 510 and the wavelength λ of the ultrasonic wave generated by the vibration end 110 satisfy: D6 = (n6*λ) / 2, and n6 is an integer, that is, when D6 is equal to an integer multiple of half the wavelength, the sixth reflected ultrasonic wave formed by the ultrasonic wave reflection at the sixth position point (P6) forms a standing wave with the original incident ultrasonic wave on the auxiliary vibration area R2 and reaches resonance.

[0187] In this way, the ultrasonic energy intensity in the auxiliary vibration region R2 is increased, so that the ultrasonic energy intensity in the auxiliary vibration region R2 approaches the ultrasonic energy intensity in the main vibration region R1.

[0188] See also Figures 2 to 8 In some embodiments of the present application, the vibration end 110 is tangent to the second surface 520 , and the width of the vibration end 110 is greater than or equal to the width of the second surface 520 .

[0189] Specifically, the vibration end 110 is configured as a curved surface structure tangent to the second surface 520 , and the curved surface curvature corresponding to the curved surface structure is close to zero.

[0190] By making the vibration end 110 tangent to the second surface 520, the contact area between the vibration end 110 and the second surface 520 can be reduced, and the friction effect of the vibration end 110 on the second surface 520 can be reduced, so that the current collector 500 can move smoothly along the running direction S. At the same time, the vibration end 110 can stably transfer vibration energy to the current collector 500 and the electrode active slurry on its first surface 510, thereby promoting uniform leveling of the electrode active slurry on the first surface 510.

[0191] In addition, by making the width of the vibration end 110 greater than or equal to the width of the second surface 520, the vibration area of ​​the vibration end 110 in the width direction covers the longitudinal area of ​​the second surface 520, so that each area in the longitudinal direction of the second surface 520 is driven to vibrate, further promoting the uniform leveling of the electrode active slurry on the first surface 510.

[0192] See also Figure 1 In some embodiments of the present application, the electrode manufacturing equipment also includes a coating device 300 and a drying device 400 arranged on the conveying path of the current collector 500, and the vibration component 100 is arranged between the coating device 300 and the drying device 400. The coating device 300 is used to coat the electrode active slurry on the first surface 510, and the drying device 400 is used to dry the electrode active slurry on the first surface 510.

[0193] Specifically, the coating device 300 may be a slot-squeeze coating head or a micro-gravure coating device. The coating device 300 may uniformly coat the electrode active slurry on the first surface 510 of the current collector 500 to form a wet-film electrode sheet. The drying device 400 may be an oven capable of feeding the wet-film electrode sheet. The drying device 400 is used to dry the wet electrode active slurry on the wet-film electrode sheet and evaporate the solvent in the electrode active slurry to form a dry electrode sheet.

[0194] It can be understood that the initial current collector 500 forms a wet film electrode after being coated by the coating device 300. The wet film electrode continues to be conveyed along the conveying direction S to the matching position of the vibration component 100 and the reinforcement component 200. After the ultrasonic energy vibration of the continuously distributed main vibration area R1 and the auxiliary vibration area R2 promotes leveling, a wet film electrode with high coating quality consistency is formed, and then continues to be conveyed to the drying device 400. The drying device 400 dries the wet film electrode to obtain a dry electrode. In this way, a electrode with high coating quality consistency is manufactured.

[0195] In addition, an embodiment of the present application further provides a battery production system, which includes the electrode manufacturing equipment of any of the above embodiments.

[0196] The battery production system of the embodiment of the present application is equipped with the above-mentioned electrode manufacturing equipment, and therefore also has the same technical effect brought by the electrode manufacturing equipment, that is, it can manufacture electrodes with high coating quality consistency, which correspondingly improves the consistency of battery capacity.

[0197] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0198] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A pole piece manufacturing device, characterized in that: include: A vibration assembly is provided on a conveyor path of a current collector, the current collector having a first surface and a second surface facing each other along its thickness direction, the first surface being coated with an undried electrode active slurry, the vibration end of the vibration assembly being provided on a side close to the second surface of the current collector, and generating ultrasonic waves through its own vibration, so that an area of ​​the first surface directly facing the vibration end forms a primary vibration zone, and an area of ​​the first surface adjacent to the primary vibration zone forms an auxiliary vibration zone through vibration transmission; The reinforcing component is at least partially arranged above the auxiliary vibration zone and is configured to at least reflect the ultrasonic wave of the auxiliary vibration zone so that the ultrasonic wave energy intensity on the auxiliary vibration zone approaches the ultrasonic wave energy intensity of the main vibration zone.

2. The pole piece manufacturing equipment according to claim 1, characterized in that: The reinforcing component includes a first reflecting surface directly opposite to the auxiliary vibration zone, the vertical distance L1 between the first reflecting surface and the current collector, and the distance L2 between the first reflecting surface and the vibration end. Along the running direction of the current collector, L1 remains unchanged as L2 increases, or L1 remains unchanged as L2 decreases.

3. The pole piece manufacturing equipment according to claim 2, characterized in that: There is at least one first position point on the first reflecting surface, and the first position point reflects the ultrasonic wave generated by the vibration of the auxiliary vibration zone to form a first reflected ultrasonic wave. The first reflected ultrasonic wave has the same frequency, amplitude, and opposite propagation direction as the ultrasonic wave generated by the vibration of the auxiliary vibration zone, and forms resonance.

4. The pole piece manufacturing equipment according to claim 3, characterized in that: The distance D1 between the first position point and the first surface and the wavelength λ of the ultrasonic wave generated by the vibration end satisfy the following: D1=(n1*λ) / 2, where n1 is an integer.

5. The pole piece manufacturing equipment according to claim 2, characterized in that: The area of ​​the first surface adjacent to the main vibration area forms two auxiliary vibration areas through vibration transmission, and along the running direction of the current collector, the two auxiliary vibration areas are respectively located upstream and downstream of the main vibration area; The reinforcing component includes a fifth reflecting surface, and the fifth reflecting surface and the first reflecting surface are respectively opposite to the upstream auxiliary vibration zone and the downstream auxiliary vibration zone. The vertical distance between the fifth reflecting surface and the current collector is L3, and the distance between the fifth reflecting surface and the vibration end is L4. Along the running direction of the current collector, L3 remains unchanged as L4 decreases.

6. The pole piece manufacturing equipment according to claim 5, characterized in that: The L1 is equal to the L3.

7. The pole piece manufacturing equipment according to claim 5, characterized in that: The fifth reflecting surface has at least one fifth position point, and the fifth position point reflects the ultrasonic wave generated by the vibration of the upstream auxiliary vibration zone to form a fifth reflected ultrasonic wave. The fifth reflected ultrasonic wave has the same frequency, the same amplitude, and the opposite propagation direction as the ultrasonic wave generated by the vibration of the upstream auxiliary vibration zone, and forms resonance.

8. The pole piece manufacturing equipment according to claim 7, characterized in that: The distance D5 between the fifth position point and the first surface and the wavelength λ of the ultrasonic wave generated by the vibration end satisfy the following: D5=(n5*λ) / 2, where n5 is an integer.

9. The pole piece manufacturing equipment according to any one of claims 2 to 8, characterized in that: The reinforcement component also includes a second reflecting surface directly opposite to the main vibration area. The vertical distance between the second reflecting surface and the current collector is L5, and the distance between the second reflecting surface and the vibration end is L6. Along the running direction of the current collector, L6 first decreases and then increases, and L5 remains unchanged, and L5 is greater than L1.

10. The pole piece manufacturing equipment according to claim 9, characterized in that: There is at least one second position point on the second reflecting surface, and the second position point reflects the ultrasonic wave generated by the vibration of the main vibration area to form a second reflected ultrasonic wave. The second reflected ultrasonic wave has the same frequency, the same amplitude, and the opposite propagation direction as the ultrasonic wave generated by the vibration of the main vibration area, and forms resonance.

11. The pole piece manufacturing equipment according to claim 10, characterized in that: The distance D2 between the second position point and the first surface and the wavelength λ of the ultrasonic wave generated by the vibration end satisfy: D2=(n2*λ) / 2, where n2 is an integer.

12. The pole piece manufacturing equipment according to claim 1, characterized in that: The auxiliary vibration zone is located downstream of the main vibration zone along the running direction of the current collector. The reinforcing assembly further includes a third reflecting surface, wherein a vertical projection of the third reflecting surface relative to the first surface covers at least a portion of a vertical projection of the main vibration zone relative to the first surface, and covers a vertical projection of the auxiliary vibration zone relative to the first surface. A vertical distance L7 between the third reflective surface and the current collector gradually decreases along the running direction of the current collector.

13. The pole piece manufacturing equipment according to claim 12, characterized in that: The third reflecting surface has at least one third position point on the area facing the auxiliary vibration zone. The third position point reflects the ultrasonic wave generated by the vibration of the auxiliary vibration zone to form a third reflected ultrasonic wave. The third reflected ultrasonic wave has the same frequency and amplitude as the ultrasonic wave generated by the vibration of the auxiliary vibration zone, and has an opposite propagation direction, and forms resonance.

14. The pole piece manufacturing equipment according to claim 13, characterized in that: The distance D3 between the third position point and the first surface and the wavelength λ of the ultrasonic wave generated by the vibration end satisfy the following: D3=(n3*λ) / 2, where n3 is an integer.

15. The pole piece manufacturing equipment according to claim 1, characterized in that: The auxiliary vibration region is located upstream of the main vibration region along the running direction of the current collector. The reinforcing assembly further includes a fourth reflecting surface, wherein a vertical projection of the fourth reflecting surface relative to the first surface covers at least a portion of a vertical projection of the main vibration region relative to the first surface, and covers a vertical projection of the auxiliary vibration region relative to the first surface. A vertical distance L8 between the fourth reflective surface and the current collector gradually increases along the running direction of the current collector.

16. The pole piece manufacturing equipment according to claim 15, characterized in that: The fourth reflecting surface has at least one fourth position point on the area facing the auxiliary vibration zone. The fourth position point reflects the ultrasonic wave generated by the vibration of the auxiliary vibration zone to form a fourth reflected ultrasonic wave. The fourth reflected ultrasonic wave has the same frequency and amplitude as the ultrasonic wave generated by the vibration of the auxiliary vibration zone, and has an opposite propagation direction, and forms resonance.

17. The pole piece manufacturing equipment according to claim 16, characterized in that: The distance D4 between the fourth position point and the first surface and the wavelength λ of the ultrasonic wave generated by the vibration end satisfy the following: D4=(n4*λ) / 2, where n4 is an integer.

18. The pole piece manufacturing equipment according to claim 1, characterized in that: The auxiliary vibration zone surrounds the main vibration zone, and the reinforcing component includes a sixth reflecting surface, wherein a vertical projection of the sixth reflecting surface relative to the first surface covers a vertical projection of the main vibration zone and the auxiliary vibration zone relative to the first surface; A vertical distance L9 between the sixth reflective surface and the current collector gradually decreases along a direction from the primary vibration region to the auxiliary vibration region.

19. The pole piece manufacturing equipment according to claim 18, characterized in that: The sixth reflecting surface has at least one sixth position point on the area facing the auxiliary vibration zone. The sixth position point reflects the ultrasonic wave generated by the vibration of the auxiliary vibration zone to form a sixth reflected ultrasonic wave. The sixth reflected ultrasonic wave has the same frequency and amplitude as the ultrasonic wave generated by the vibration of the auxiliary vibration zone, and has an opposite propagation direction, and forms resonance.

20. The pole piece manufacturing equipment according to claim 19, characterized in that: The distance D6 between the sixth position point and the first surface and the wavelength λ of the ultrasonic wave generated by the vibration end satisfy the following: D6=(n6*λ) / 2, where n6 is an integer.

21. The pole piece manufacturing equipment according to any one of claims 1 to 8 or any one of claims 12 to 20, characterized in that: The vibration end is tangent to the second surface, and a width of the vibration end is greater than or equal to a width of the second surface.

22. The pole piece manufacturing equipment according to any one of claims 1 to 8 or any one of claims 12 to 19, characterized in that: The electrode manufacturing equipment also includes a coating device and a drying device arranged on the belt path of the current collector, and the vibration component is arranged between the coating device and the drying device. The coating device is used to coat the electrode active slurry on the first surface, and the drying device is used to dry the electrode active slurry on the first surface.

23. A battery production system, characterized in that: Comprising the pole piece manufacturing equipment as described in any one of claims 1 to 22.

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