Pole piece manufacturing equipment and battery production system

Abstract

The present application relates to a pole piece manufacturing device and a battery production system, the pole piece manufacturing device comprises: a vibration assembly arranged on a tape path of a current collector, the current collector has a first surface and a second surface opposite to each other along the thickness direction of the current collector, the first surface is coated with an undried electrode active slurry, and the second surface is coated with an undried electrode active slurry; the vibration end of the vibration assembly is arranged on one side close to the second surface of the current collector, so that a main vibration area is formed in the area, opposite to the vibration end, of the first surface, and an auxiliary vibration area is formed in the area, adjacent to the main vibration area, of the first surface through vibration transmission; and the enhancement assembly is at least partially arranged above the auxiliary vibration area and is configured to be used for at least reflecting the ultrasonic waves of the auxiliary vibration area, so that the energy intensity of the ultrasonic waves on the auxiliary vibration area approaches the energy intensity of the ultrasonic waves of the main vibration area. According to the pole piece manufacturing equipment, the coating quality consistency of the wet film pole piece can be effectively improved.

Description

Technical Field

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

[0002] During the battery production process, multiple processes need to be performed on the pole piece, such as coating, cold pressing, die cutting, winding, etc. on the pole piece. Among them, pole piece coating means: uniformly coating the electrode active slurry (positive / negative electrode slurry) on the surface of the metal current collector, and after drying, forming the pole piece of the battery.

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

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

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

[0006] A vibration assembly, arranged on the running path of the current collector. The current collector has a first surface and a second surface opposite to each other in the thickness direction of itself. The first surface is coated with the undried electrode active slurry. The vibrating end of the vibration assembly is arranged on one side close to the second surface of the current collector, so that the area on the first surface facing the vibrating end forms a main vibration area, and the area adjacent to the main vibration area on the first surface forms an auxiliary vibration area through vibration transmission;

[0007] An enhancement assembly, at least part of the enhancement assembly is arranged above the auxiliary vibration area, and is configured to at least reflect the ultrasonic waves 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.

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

[0009] The pole piece manufacturing equipment of the present application, through the cooperative setting of the vibration assembly and the enhancement assembly on the tape running path of the current collector, the vibrating end of the vibration assembly forms an ultrasonic sound source, driving the current collector to perform high-frequency mechanical vibration, so that the area where the first surface faces the vibrating end forms a main vibration area with a relatively high ultrasonic energy intensity, and the area adjacent to the main vibration area on the first surface forms an auxiliary vibration area through vibration transmission. Relying on the ultrasonic energy in the main vibration area and the auxiliary vibration area to promote the leveling of the electrode active paste on the first surface. At the same time, the ultrasonic waves in at least the auxiliary vibration area are reflected by the enhancement assembly, so that the ultrasonic energy intensity in the auxiliary vibration area approaches the ultrasonic energy intensity in the main vibration area, making the ultrasonic energy intensity in the auxiliary vibration area and the ultrasonic energy intensity in the main vibration area be distributed approximately evenly, enabling the current collector to be affected by the continuous and relatively evenly distributed ultrasonic energy in the main vibration area and the auxiliary vibration area during the tape running process, making the electrode active paste on the first surface flow more evenly in the transverse and longitudinal directions, reducing the probability of density gradient caused by the vibration energy difference between the main vibration area and the auxiliary vibration area, and further improving the coating quality consistency of the wet film pole piece.

[0010] In some embodiments of the present application, the enhancement assembly includes a first reflection surface facing the auxiliary vibration area. The vertical distance L1 between the first reflection surface and the current collector, and the distance L2 between the first reflection surface and the vibrating end. Along the tape running direction of the current collector, L1 remains unchanged as L2 increases, or L1 remains unchanged as L2 decreases.

[0011] With such a setting, the ultrasonic energy intensity in the auxiliary vibration area is increased, so that the ultrasonic energy intensity in the auxiliary vibration area approaches the ultrasonic energy intensity in the main vibration area, making the ultrasonic energy intensity in the auxiliary vibration area and the ultrasonic energy intensity in the main vibration area be distributed approximately evenly, enabling the current collector to be affected by the continuous and relatively evenly distributed ultrasonic energy in the main vibration area and the auxiliary vibration area during the tape running process, making the electrode active paste on the first surface flow more evenly in the transverse and longitudinal directions, reducing the probability of density gradient caused by the vibration energy difference between the main vibration area and the auxiliary vibration area, and further improving the coating quality consistency of the wet film pole piece.

[0012] In some embodiments of the present application, there is at least one first position point on the first reflection surface. The first position point reflects the ultrasonic waves generated by the vibration in the auxiliary vibration area to form first reflected ultrasonic waves. The first reflected ultrasonic waves have the same frequency, the same amplitude, and the opposite propagation direction as the ultrasonic waves generated by the vibration in the auxiliary vibration area, and form resonance.

[0013] With such a setting, all the ultrasonic waves reflected by the first reflecting surface resonate with all the corresponding initial incident waves on the auxiliary vibration area, increasing the ultrasonic energy intensity on the auxiliary vibration area, so that the ultrasonic energy intensity on the auxiliary vibration area approaches the ultrasonic energy intensity of the main vibration area, making the ultrasonic energy intensity on the auxiliary vibration area and the ultrasonic energy intensity of the main vibration area roughly evenly distributed. During the process of the current collector running the tape, the current collector can be affected by the continuous and relatively evenly distributed ultrasonic energy on the main vibration area and the auxiliary vibration area, enabling the electrode active paste on the first surface to flow more evenly in the transverse and longitudinal directions, reducing the probability of density gradient caused by the vibration energy difference between the main vibration area and the auxiliary vibration area, and further improving the coating quality consistency of the wet film pole piece.

[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 vibrating end satisfy: D1 = (n1 * λ) / 2, where n1 is an integer.

[0015] With such a setting, the ultrasonic energy intensity on the auxiliary vibration area is increased, so that the ultrasonic energy intensity on the auxiliary vibration area approaches the ultrasonic energy intensity of the main vibration area, and the ultrasonic energy intensity on the auxiliary vibration area and the ultrasonic energy intensity of the main vibration area are roughly evenly distributed.

[0016] In some embodiments of the present application, two auxiliary vibration areas are formed by vibration transmission in the area of the first surface adjacent to the main vibration area. Along the running direction of the current collector tape, the two auxiliary vibration areas are respectively located upstream and downstream of the main vibration area;

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

[0018] With such a setting, when the current collector runs the tape along the running direction, it will successively run to the auxiliary vibration area upstream of the main vibration area, the main vibration area, and the auxiliary vibration area downstream of the main vibration area. Through the ultrasonic vibration generated by a single vibrating end, combined with the standing wave resonance effect formed by the first reflecting surface and the fifth reflecting surface of the enhancement component on the corresponding auxiliary vibration areas, the ultrasonic energy intensity of the above three continuously distributed vibration areas is relatively uniform, and there will be no large sudden change or difference in energy intensity. This not only increases the coverage area of the ultrasonic energy field with stronger energy on the first surface, improves the leveling efficiency of the electrode active paste on the first surface, but also further makes the electrode active paste on the first surface flow more evenly in the transverse and longitudinal directions, further reducing the probability of density gradient caused by the vibration energy difference between the main vibration area and the auxiliary vibration area, and further improving the coating quality consistency of the wet film pole piece.

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

[0020] With such a setting, the reflection degrees of the ultrasonic waves of the first reflecting surface and the fifth reflecting surface of the enhancement component on the ultrasonic waves of the two auxiliary oscillation regions can be made substantially the same, so that the standing wave resonance intensities formed by the two auxiliary oscillation regions are basically the same. Thereby, the ultrasonic energy intensity of the main oscillation region is further made relatively uniform with the ultrasonic energy intensities of the two auxiliary oscillation regions upstream and downstream thereof, further reducing the probability of density gradient caused by the vibration energy difference between the main oscillation region and the auxiliary oscillation regions, 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 waves generated by the vibration of the upstream auxiliary oscillation region to form fifth reflected ultrasonic waves. The fifth reflected ultrasonic waves have the same frequency, the same amplitude, and the opposite propagation direction as the ultrasonic waves generated by the vibration of the upstream auxiliary oscillation region, and form resonance.

[0022] With such a setting, all the ultrasonic waves reflected by the fifth reflecting surface reach resonance with all the corresponding initial incident waves on the upstream auxiliary oscillation region, increasing the ultrasonic energy intensity on the upstream auxiliary oscillation region, making the ultrasonic energy intensity on the upstream auxiliary oscillation region approach the ultrasonic energy intensity of the main oscillation region, and cooperating with the enhancement effect of the first reflecting surface on the ultrasonic energy intensity of the downstream auxiliary oscillation region, so that the ultrasonic energy intensities of the upstream and downstream auxiliary oscillation regions and the ultrasonic energy intensity of the main oscillation region 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 waves generated by the vibration end satisfy: D5 = (n5 * λ) / 2, where n5 is an integer.

[0024] With such a setting, the ultrasonic energy intensity on the upstream auxiliary oscillation region R2 is increased, making the ultrasonic energy intensity on the upstream auxiliary oscillation region R2 approach the ultrasonic energy intensity of the main oscillation region R1, and making the ultrasonic energy intensity of the upstream auxiliary oscillation region R2 and the ultrasonic energy intensity of the main oscillation region R1 roughly evenly distributed.

[0025] In some embodiments of the present application, the enhancement component further includes a second reflecting surface facing the main oscillation region. The perpendicular distance L5 from the second reflecting surface to the current collector, and the distance L6 from the second reflecting surface to the vibration end. 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, while increasing the ultrasonic energy in the main vibration area and the auxiliary vibration area to promote the leveling of the electrode active paste, the total ultrasonic energy after the superposition of the original ultrasonic energy and the resonance energy in the main vibration area is closer to the total energy after the superposition of the original ultrasonic energy and the resonance energy in the auxiliary vibration area. Furthermore, the ultrasonic energy intensity in the auxiliary vibration area approaches the ultrasonic energy intensity in the main vibration area, making the ultrasonic energy intensity in the auxiliary vibration area and the ultrasonic energy intensity in the main vibration area be roughly evenly distributed.

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

[0028] With such a setting, the ultrasonic energy in the auxiliary vibration area is increased to promote the leveling of the electrode active paste, and at the same time, the ultrasonic energy in the main vibration area and the auxiliary vibration area tends 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 waves generated by the vibrating end satisfy: D2 = (n2 * λ) / 2, where n2 is an integer.

[0030] With such a setting, all the ultrasonic waves reflected by the second reflection surface reach resonance with all the corresponding initial incident waves on the main vibration area, increasing the ultrasonic energy intensity on the main vibration area and improving the leveling effect of the electrode active paste on the first surface.

[0031] In some embodiments of the present application, along the tape-running direction of the current collector, the auxiliary vibration area is located downstream of the main vibration area. The enhancement component further includes a third reflection surface. The perpendicular projection of the third reflection surface on the first surface covers at least part of the perpendicular projection of the main vibration area on the first surface and covers the perpendicular projection of the auxiliary vibration area on the first surface;

[0032] The perpendicular distance L7 from the third reflection surface to the current collector gradually decreases along the tape-running direction of the current collector.

[0033] With such a setting, the ultrasonic energy intensity in the auxiliary vibration area can be increased, making the ultrasonic energy intensity in the auxiliary vibration area approach the ultrasonic energy intensity in the main vibration area.

[0034] In some embodiments of the present application, there is at least one third position point on the area of the third reflection surface facing the auxiliary vibration area. The third position point reflects the ultrasonic waves generated by the vibration in the auxiliary vibration area to form third reflected ultrasonic waves. The third reflected ultrasonic waves have the same frequency, the same amplitude, and the opposite propagation direction as the ultrasonic waves generated by the vibration in the auxiliary vibration area, and form resonance.

[0035] With such a setting, the ultrasonic energy intensity on the auxiliary vibration area can be increased, so that the ultrasonic energy intensity on the auxiliary vibration area approaches the ultrasonic energy intensity of the main vibration area.

[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] With such a setting, the third reflected ultrasonic wave formed by ultrasonic wave reflection at the third position point and the initial ultrasonic wave generated by the vibration of the auxiliary vibration area form a standing wave resonance.

[0038] In some embodiments of the present application, along the tape running direction of the current collector, the auxiliary vibration area is located upstream of the main vibration area, and the enhancement component further includes a fourth reflection surface. The vertical projection of the fourth reflection surface relative to the first surface covers at least part of the vertical projection of the main vibration area relative to the first surface and covers the vertical projection of the auxiliary vibration area relative to the first surface;

[0039] The vertical distance L8 from the fourth reflection surface to the current collector gradually increases along the tape running direction of the current collector.

[0040] With such a setting, when the current collector runs along the tape running direction, it will successively run to the auxiliary vibration area upstream of the main vibration area and the main vibration area. Through the ultrasonic vibration generated by a single vibrating end and in cooperation with the standing wave resonance effect formed by the enhancement component on the auxiliary vibration area, the ultrasonic energy intensity of the above two continuously distributed vibration areas is relatively uniform, and there will be no large sudden change or difference in energy intensity. This not only increases the coverage area of the ultrasonic energy field with stronger energy on the first surface and improves the leveling efficiency of the electrode active paste on the first surface, but also further makes the electrode active paste on the first surface flow more uniformly in the transverse and longitudinal directions, further reducing the probability of density gradient caused by the vibration energy difference between the main vibration area and the auxiliary vibration area, and further improving the coating quality consistency of the wet film electrode sheet.

[0041] In some embodiments of the present application, there is at least one fourth position point on the area of the fourth reflection surface facing the auxiliary vibration area. The fourth position point reflects the ultrasonic wave generated by the vibration of the auxiliary vibration area 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 area, and forms a resonance.

[0042] With such a setting, the ultrasonic energy intensity on the auxiliary vibration area can also be increased, so that the ultrasonic energy intensity on the auxiliary vibration area approaches the ultrasonic energy intensity of 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 vibrating end satisfy: D4 = (n4 * λ) / 2, where n4 is an integer.

[0044] With such a setting, the ultrasonic energy intensity in the auxiliary vibration area is increased, so that the ultrasonic energy intensity in the auxiliary vibration area approaches the ultrasonic energy intensity in the main vibration area.

[0045] In some embodiments of the present application, the auxiliary vibration area surrounds the main vibration area, and the enhancement component includes a sixth reflecting surface. The vertical projection of the sixth reflecting surface relative to the first surface covers the main vibration area and the vertical projection of the auxiliary vibration area relative to the first surface;

[0046] The vertical distance L9 between the sixth reflecting surface and the current collector gradually decreases along the direction from the main vibration area to the auxiliary vibration area.

[0047] With such a setting, the ultrasonic energy intensity of the above two continuously distributed vibration areas can also be relatively uniform, and there will be no large sudden change or difference in energy intensity. This not only increases the coverage area of the ultrasonic energy field with stronger energy on the first surface, improves the leveling efficiency of the electrode active paste on the first surface, but also further makes the electrode active paste on the first surface flow more uniformly in the transverse and longitudinal directions, further reduces the probability of density gradient caused by the vibration energy difference between the main vibration area and the auxiliary vibration area, and further improves the coating quality consistency of the wet film electrode.

[0048] In some embodiments of the present application, there is at least one sixth position point in the area of the sixth reflecting surface facing the auxiliary vibration area. The sixth position point reflects the ultrasonic wave generated by the vibration of the auxiliary vibration area 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 area, and forms resonance.

[0049] With such a setting, the ultrasonic energy intensity in the auxiliary vibration area can also be increased, 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] With such a setting, the ultrasonic energy intensity in the auxiliary vibration area is increased, so that the ultrasonic energy intensity in the auxiliary vibration area approaches the ultrasonic energy intensity in the main vibration area.

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

[0053] With such an arrangement, the contact area between the vibrating end and the second surface can be reduced, the frictional influence of the vibrating end on the second surface can be lowered, enabling the current collector to smoothly run along the tape-running direction. In addition, by making the width of the vibrating end greater than or equal to the width of the second surface, the vibration region of the vibrating end in the width direction covers the longitudinal region of the second surface, so that each region in the longitudinal direction of the second surface is driven to vibrate, further promoting the uniform leveling of the electrode active paste on the first surface.

[0054] In some embodiments, the electrode sheet manufacturing apparatus further includes a coating device and a drying device disposed on the tape-running path of the current collector. The vibration assembly is disposed between the coating device and the drying device. The coating device is used for coating the electrode active paste on the first surface, and the drying device is used for drying the electrode active paste on the first surface.

[0055] With such an arrangement, the initial current collector forms a wet film electrode sheet after being coated by the coating device. The wet film electrode sheet continues to run along the tape-running direction to the cooperation position of the vibration assembly and the enhancement assembly. After being promoted to level by the ultrasonic energy vibration of the continuously distributed main vibration region and auxiliary vibration region, a wet film electrode sheet with a relatively high coating quality consistency is formed. Then it continues to run to the drying device, and the drying device dries the wet film electrode sheet to obtain a dry electrode sheet. In this way, an electrode sheet with a relatively high coating quality consistency is manufactured.

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

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

[0058] The battery production system of the present application, because it is configured with the above-mentioned electrode sheet manufacturing apparatus, thus also has the same technical effects brought by this electrode sheet manufacturing apparatus, that is, it can manufacture an electrode sheet with a relatively high coating quality consistency, correspondingly improving the consistency of battery capacity.

[0059] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the following specifically gives the specific embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become apparent to those of ordinary skill in the art. The drawings are only for the purpose of illustrating the preferred embodiments and are not considered to be a limitation of the present application. Also, in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

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

[0062] Figure 2 It is a schematic partial structure of the pole piece manufacturing equipment according to an embodiment of the present application Figure 1 。

[0063] Figure 3 It is a schematic cooperation structure diagram of the current collector, the vibration assembly and the reinforcement assembly according to an embodiment of the present application Figure 1 。

[0064] Figure 4 It is a schematic cooperation structure diagram of the current collector, the vibration assembly and the reinforcement assembly according to an embodiment of the present application Figure 2 。

[0065] Figure 5 It is a schematic cooperation structure diagram of the current collector, the vibration assembly and the reinforcement assembly according to an embodiment of the present application Figure 3 。

[0066] Figure 6 It is a schematic cooperation structure diagram of the current collector, the vibration assembly and the reinforcement assembly according to an embodiment of the present application Figure 4 。

[0067] Figure 7 It is a schematic cooperation structure diagram of the current collector, the vibration assembly and the reinforcement assembly according to an embodiment of the present application Figure 5 。

[0068] Figure 8 It is a schematic cooperation structure diagram of the current collector, the vibration assembly and the reinforcement assembly according to an embodiment of the present application Figure 6 。

[0069] Description of reference numerals: Vibration assembly 100; Vibration end 110; Enhancement assembly 200; First reflector 210; First reflecting surface 211; Second reflector 220; Second reflecting surface 221; Third reflector 230; Third reflecting surface 231; Fourth reflector 240; Fourth reflecting surface 241; Fifth reflector 250; Fifth reflecting surface 251; Sixth reflector 260; Sixth reflecting surface 261; Coating device 300; Drying device 400; Current collector 500; Coating area 501; Non - coating area 502; First surface 510; Second surface 520; Tension adjusting 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 implementation manners

[0070] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the protection scope of the present application.

[0071] In the description of the present application, it should be understood that if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0072] In addition, if there are terms such as "first" and "second", these terms are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present application, if there is a term "plural", the meaning of "plural" is at least two, such as two, three, etc., unless otherwise specifically and clearly limited.

[0073] In this application, unless otherwise clearly defined and limited, if terms such as "installed", "connected", "linked", "fixed", etc. appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0074] In this application, unless otherwise clearly defined and limited, if there is a description such as a first feature being "on" or "under" a second feature, its meaning can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature is at a higher horizontal level than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature is at a lower horizontal level than the second feature.

[0075] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. If so, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in this application are only for the purpose of illustration and do not represent the only implementation.

[0076] Currently, from the perspective of the development of the market situation, the application of batteries is becoming more and more extensive. Batteries are not only applied to energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely applied to electric transportation means such as electric bicycles, electric motorcycles, electric vehicles, as well as multiple fields such as military equipment and aerospace. With the continuous expansion of the application fields of batteries, the market demand is also constantly increasing.

[0077] A battery is composed of one or more battery cells. For each battery, the multiple battery cells that make it up can be connected in series, in parallel or in a mixed connection. Among them, a mixed connection means that there are both series and parallel connections among multiple battery cells.

[0078] A battery cell is the smallest unit that makes up a battery. In the structure of a battery cell, it includes a housing, an electrolyte, and an electrode assembly. The electrode assembly is the component in the battery cell where electrochemical reactions occur. The electrode assembly includes a positive electrode plate, a negative electrode plate, and a separator. The housing can include one or more electrode assemblies. The electrode assembly is mainly formed by winding or laminating the positive electrode plate and the negative electrode plate, and a separator is usually disposed between the positive electrode plate and the negative electrode plate.

[0079] The housing has a structure with an open end and a hollow interior. The electrode assembly is disposed inside the housing, and an end cap is covered on the open end of the housing. By making the end cap cover the opening at the open end, an internal environment of the battery cell is formed. Of course, the end cap and the housing can also be integrated. Specifically, the end cap and the housing can form a common connection surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing, then make the end cap cover the housing. The housing can be of various shapes and various sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing can be determined according to the specific shape and size of the electrode assembly. The material of the housing can be various, for example, copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. The embodiments of the present application do not make special restrictions on this.

[0080] During the battery production process, multiple processes need to be performed on the electrode plates of the battery, such as coating, cold pressing, die cutting, winding, etc. Among them, coating means: uniformly coating an electrode active paste (positive / negative paste) on the surface of a metal current collector, and after drying, forming the electrode plate of the battery.

[0081] In the related art, after the coating device coats the electrode active paste on the surface of the current collector, the current collector becomes a wet film electrode plate. The electrode active paste naturally levels under the action of its own gravity and the surface tension of the current collector, forming a wet film electrode plate. However, the natural leveling ability of the electrode active paste is poor and the leveling consistency is poor, resulting in problems such as uneven thickness and uneven mass distribution of the wet film electrode plate, and poor coating quality consistency, causing poor capacity consistency of the battery.

[0082] Based on the above situation, aiming at the problems that the current electrode active paste has poor natural leveling ability on the surface of the current collector and poor leveling consistency, resulting in poor coating quality consistency of the wet film electrode sheet, one or more embodiments of the present application provide a pole piece manufacturing device. Through the cooperative setting of the vibration assembly and the enhancement assembly on the tape running path of the current collector, the vibrating end of the vibration assembly forms an ultrasonic sound source, driving the current collector to perform high-frequency mechanical vibration, so that the area where the first surface faces the vibrating end forms a main vibration area with a relatively high ultrasonic energy intensity. The area adjacent to the main vibration area on the first surface forms an auxiliary vibration area through vibration transmission. Relying on the ultrasonic energy in the main vibration area and the auxiliary vibration area to promote the leveling of the electrode active paste on the first surface. At the same time, the enhancement assembly reflects at least the ultrasonic waves 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, making the ultrasonic energy intensity in the auxiliary vibration area and the ultrasonic energy intensity in the main vibration area be distributed approximately evenly, enabling the current collector to be affected by the continuous and relatively evenly distributed ultrasonic energy in the main vibration area and the auxiliary vibration area during the tape running process, making the electrode active paste on the first surface flow more evenly in the transverse and longitudinal directions, reducing the probability of density gradient caused by the vibration energy difference between the main vibration area and the auxiliary vibration area, and further improving the coating quality consistency of the wet film electrode sheet.

[0083] See Figure 1 , Figure 2 and Figure 3 , embodiments of the present application provide a pole piece manufacturing device, and the pole piece manufacturing device includes a vibration assembly 100 and an enhancement assembly 200.

[0084] The vibration assembly 100 is arranged on the tape running path of the current collector 500. The current collector 500 has a first surface 510 and a second surface 520 opposite to each other in its own thickness direction. The first surface 510 is coated with undried electrode active paste. The vibrating end 110 of the vibration assembly 100 is arranged on one side close to the second surface 520 of the current collector 500, so that the area where the first surface 510 faces the vibrating end 110 forms a main vibration area R1, and the area adjacent to the main vibration area R1 on the first surface 510 forms an auxiliary vibration area R2 through vibration transmission.

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

[0086] It should be noted that, see Figure 1, in the electrode manufacturing equipment of the present application, it may further include an unwinding device (not shown in the figure), a coating device 300, a drying device 400, a tension adjusting device 600, and a winding device (not shown in the figure). The unwinding device is used to release the uncoated base current collector 500 and provide initial tension control. The unwinding device can be an unwinding roller. The coating device 300 is used to coat the electrode active paste on the first surface 510 of the current collector 500 to uniformly coat the electrode active paste on the first surface 510 to form a wet film electrode. The coating device 300 can be a slit extrusion coating head. The drying device 400 is used to dry the wet electrode active paste on the wet film electrode, evaporate the solvent in the electrode active paste, and form a dry electrode. The drying device 400 can be an oven capable of allowing the wet film electrode to pass through. The tension adjusting device 600 is used to adjust the tension of the current collector 500 during the tape running process to make the current collector 500 stably run along the tape running path. The tension adjusting device 600 can be a floating roller for the second surface 520 of the current collector 500 to abut or wind around. The winding device is used to rewind the above dry electrode into a roll and provide end tension control. The winding device can be a winding roller.

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

[0088] It should be noted that referring to Figure 2 , the coating surface of the current collector 500 is divided into a plurality of alternately distributed coating areas 501 and non-coating areas 502 along its own width direction. The coating areas 501 need to be coated with the electrode active paste, and the non-coating areas 502 are not coated with the electrode active paste. Generally, the non-coating areas 502 are used to make the tab structure of the electrode. It is easy to understand that the first surface 510 of the current collector 500 refers to the coating area 501 of the current collector 500. Correspondingly, the second surface 520 of the current collector 500 refers to the area on the non-coating surface of the current collector 500 that coincides with the projection of the first surface 510.

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

[0090] Referring to Figure 3 , Figure 3 The dotted lines with up and down arrows in 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 in the main vibration area R1 and the auxiliary vibration area R2 propagate on the first surface 510 of the current collector 500, high-frequency pressure fluctuations will be generated, causing a local negative pressure area to form on the first surface 510 and forming tiny bubbles. When these tiny bubbles rapidly expand and collapse, strong microjets and shear forces will be generated. The microjets can break the agglomerated particles or colloidal structures in the electrode active paste coated on the first surface 510, reducing the local viscosity gradient. At the same time, the shear force can reduce the apparent viscosity of the electrode active paste, making the electrode active paste flow more easily on the first surface 510 and improving the leveling efficiency of the electrode active paste on the first surface 510. In addition, the high-frequency mechanical vibration of the ultrasonic wave can simulate the shear effect, temporarily reducing the viscosity of the electrode active paste, making the electrode active paste spread more easily under the action of the surface tension on the first surface 510, reducing the unevenness after coating, and making the electrode active paste evenly distributed on the first surface 510.

[0093] Generally speaking, the ultrasonic energy in the main vibration area R1 on the first surface 510 of the current collector 500 and the auxiliary vibration area R2 adjacent to the main vibration area R1 can promote the leveling of the electrode active paste on the first surface 510, improve the leveling efficiency and leveling consistency of the electrode active paste on the first surface 510, make the electrode active paste evenly distributed on the first surface 510, and further improve the coating quality consistency of the wet film electrode sheet.

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

[0095] In the embodiment of the present application, the enhancement component 200 may be a reflector structure. By reasonably adjusting parameters such as the ultrasonic frequency, 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 enhancement component 200 may also be an acoustic lens, which focuses and reflects ultrasonic waves through the concave structure of the acoustic lens and reasonably adjusts the resonance parameters to also be able to excite resonance.

[0096] According to the above description, it can be understood that by the reflection of the ultrasonic waves in the auxiliary vibration region R2 by the enhancement component 200 and making the auxiliary vibration region R2 form a resonance effect, the ultrasonic energy intensity in the auxiliary vibration region R2 can approach the ultrasonic energy intensity in the main vibration region R1, that is, the ultrasonic energy intensity in the auxiliary vibration region R2 and the ultrasonic energy intensity in the main vibration region R1 are roughly evenly distributed. When the current collector 500 travels through the main vibration region R1 and the auxiliary vibration region R2, the electrode active paste on its first surface 510 can flow more evenly in the transverse direction (the traveling direction of the tape) and the longitudinal direction (perpendicular to the traveling direction of the tape), reducing the probability of density gradient caused by the vibration energy difference between the main vibration region R1 and the auxiliary vibration region R2, and further improving the coating quality consistency of the wet film electrode.

[0097] In the electrode manufacturing apparatus of the embodiment of the present application, through the cooperative setting of the vibration component 100 and the enhancement component 200 on the traveling path of the current collector 500, the vibration end 110 of the vibration component 100 forms an ultrasonic sound source, driving the current collector 500 to perform high-frequency mechanical vibration, so that the region of the first surface 510 facing the vibration end 110 forms a main vibration region R1 with a relatively high ultrasonic energy intensity, and the region adjacent to the main vibration region R1 on the first surface 510 forms an auxiliary vibration region R2 through vibration transmission. Relying on the ultrasonic energy in the main vibration region R1 and the auxiliary vibration region R2 to promote the leveling of the electrode active paste on the first surface 510. At the same time, by the enhancement component 200 reflecting at least the ultrasonic waves in the auxiliary vibration region R2, the ultrasonic energy intensity in the auxiliary vibration region R2 approaches the ultrasonic energy intensity in the main vibration region R1, making the ultrasonic energy intensity in the auxiliary vibration region R2 and the ultrasonic energy intensity in the main vibration region R1 roughly evenly distributed, enabling the current collector 500 to be subjected to the continuous and relatively evenly distributed ultrasonic energy in the main vibration region R1 and the auxiliary vibration region R2 during the tape traveling process, making the electrode active paste on the first surface 510 flow more evenly in the transverse and longitudinal directions, reducing the probability of density gradient caused by the vibration energy difference between the main vibration region R1 and the auxiliary vibration region 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 redistributes the acoustic field energy on the secondary resonance region R2 by at least reflecting the ultrasonic waves in the secondary resonance region R2, so that some of the ultrasonic waves radiated outside the secondary resonance region R2 can be reflected back to the secondary resonance region R2, reducing the ultrasonic energy loss in the secondary resonance region R2, increasing the ultrasonic energy intensity in the secondary resonance region R2, making the ultrasonic energy intensity in the secondary resonance region R2 closer to the ultrasonic energy intensity in the primary resonance region R1. At the same time, the ultrasonic waves emitted from the vibrating end 110 of the vibrating 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 a larger area of ultrasonic energy region, the leveling efficiency of the electrode active paste on the first surface 510 is improved, thereby improving the coating quality consistency of the wet film electrode.

[0099] In addition, the ultrasonic energy intensity in the secondary resonance region R2 approaching the ultrasonic energy intensity in the primary resonance region R1 can be understood as the ultrasonic energy intensity in the secondary resonance region R2 and the ultrasonic energy intensity in the primary resonance region R1 being relatively uniform, and the absolute value of the difference between the two being relatively small. Or rather, the absolute value of the difference between the ultrasonic energy intensity in the secondary resonance region R2 and the ultrasonic energy intensity in the primary resonance region R1 is within an acceptable range. When the absolute value of the difference between the ultrasonic energy intensity in the secondary resonance region R2 and the ultrasonic energy intensity in the primary resonance region R1 is within an acceptable range, when the enhancement component 200 is at least partially arranged in the secondary resonance region R2, by detecting the thickness consistency of the current collector 500 after the vibration leveling treatment by the vibrating component 100 and the enhancement component 200, the leveling property of the electrode active paste on the first surface 510 of 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 enhancement component 200 includes a first reflection surface 211 facing the secondary resonance region R2. The perpendicular distance L1 from the first reflection surface 211 to the current collector 500, and the distance L2 from the first reflection surface 211 to the vibrating end 110. Along the tape running direction S of the current collector 500, L1 remains unchanged as L2 increases, or L1 remains unchanged as L2 decreases.

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

[0102] The enhancement component 200 may include a first reflector 210, on which a first reflecting surface 211 is provided. The first reflecting surface 211 is a surface of the first reflector 210. It is easy to understand that regardless of how the distance L2 between the first reflecting surface 211 and the vibrating end 110 changes, the perpendicular distance L1 between the first reflecting surface 211 and the current collector 500 is a fixed value, making the first reflecting surface 211 parallel to the current collector 500.

[0103] Along the tape running direction S of the current collector 500, the auxiliary vibration area R2 may be located upstream or downstream of the main vibration area R1. Refer to Figure 3 , when the auxiliary vibration area R2 is located downstream of the main vibration area R1, along the tape running direction S of the current collector 500, the distance L2 between the first reflecting surface 211 and the vibrating end 110 gradually increases, and the perpendicular distance L1 between the first reflecting surface 211 and the current collector 500 remains unchanged. When the auxiliary vibration area R2 is located upstream of the main vibration area R1, the distance L2 between the first reflecting surface 211 and the vibrating end 110 gradually decreases, and the perpendicular distance L1 between the first reflecting surface 211 and the current collector 500 also remains unchanged.

[0104] In the above structure, the first reflecting surface 211 is made parallel to the current collector 500, and parameters such as the ultrasonic frequency and L1 are reasonably adjusted, so that the ultrasonic waves reflected on the first reflecting surface 211 resonate with the ultrasonic waves generated by the vibration of the first surface 510, increasing the ultrasonic energy intensity in the auxiliary vibration area R2, making the ultrasonic energy intensity in the auxiliary vibration area R2 approach the ultrasonic energy intensity in the main vibration area R1, making the ultrasonic energy intensity in the auxiliary vibration area R2 and the ultrasonic energy intensity in the main vibration area R1 be distributed approximately evenly, enabling the current collector 500 to be affected by the continuous and relatively evenly distributed ultrasonic energy in the main vibration area R1 and the auxiliary vibration area R2 during the tape running process, making the electrode active paste on the first surface 510 flow more evenly in the transverse and longitudinal directions, 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 pole piece.

[0105] Furthermore, refer to 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 waves generated by the vibration of the auxiliary vibration area R2 to form first reflected ultrasonic waves. The first reflected ultrasonic waves have the same frequency, the same amplitude, and the opposite propagation direction as the ultrasonic waves generated by the vibration of the auxiliary vibration area R2, and form resonance.

[0106] It should be noted that the ultrasonic waves generated by the vibration of the auxiliary vibration area R2 refer to the ultrasonic waves formed by the vibration transmitted from the vibrating end 110 to the auxiliary vibration area R2 through the vibration of the current collector 500, and can also be understood as the incident ultrasonic waves in the auxiliary vibration area R2.

[0107] Specifically, taking the example where the secondary vibration region R2 is located downstream of the primary vibration region R1, the first reflecting surface 211 faces the secondary vibration region R2, and the perpendicular projection of the first reflecting surface 211 relative to the first surface 510 covers the perpendicular projection of the secondary vibration region R2 relative to the first surface 510. In this way, the first reflecting surface 211 can reflect the ultrasonic waves propagating in the thickness direction of the current collector 500 in the secondary vibration region R2.

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

[0109] The ultrasonic waves reflected by the first position point P1 on the first reflecting surface 211 form the first reflected ultrasonic waves. The first reflected ultrasonic waves have the same frequency, the same amplitude, and the opposite propagation direction as the ultrasonic waves generated by the vibration of the secondary vibration region R2, forming a standing wave. By adjusting the excitation frequency of the vibrating end 110 of the vibration assembly 100 and the perpendicular distance L1 between the first reflecting surface 211 and the current collector 500, a resonance effect can be formed in the standing wave within the secondary vibration region R2.

[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 secondary vibration region R2, increasing the ultrasonic energy intensity on the secondary vibration region R2, making the ultrasonic energy intensity on the secondary vibration region R2 approach the ultrasonic energy intensity of the primary vibration region R1, making the ultrasonic energy intensity distribution on the secondary vibration region R2 and the primary vibration region R1 roughly uniform, enabling the current collector 500 to be affected by the continuous and relatively uniformly distributed ultrasonic energy on the primary vibration region R1 and the secondary vibration region R2 during the tape running process, making the electrode active slurry on the first surface 510 flow more uniformly in the transverse and longitudinal directions, reducing the probability of density gradient caused by the vibration energy difference between the primary vibration region R1 and the secondary vibration region R2, and further improving the coating quality consistency of the wet film electrode.

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

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

[0113] Thus, the ultrasonic energy intensity on the auxiliary vibration area R2 is increased, so that the ultrasonic energy intensity on the auxiliary vibration area R2 approaches that on the main vibration area R1, and the ultrasonic energy intensity on the auxiliary vibration area R2 and that on the main vibration area R1 are roughly evenly distributed. During the tape running process of the current collector 500, the ultrasonic energy acting continuously and relatively evenly distributed on the main vibration area R1 and the auxiliary vibration area R2 can be received, so that the electrode active paste on the first surface 510 can flow more evenly in the transverse and longitudinal directions, 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 sheet.

[0114] See Figure 3 , taking the first reflection surface 211 parallel to the first surface 510 as an example, the parameter settings of the distance between the first reflection surface 211 and the first surface 510 and the ultrasonic frequency of the vibration end 110 of the vibration assembly 100 are described:

[0115] The propagation speed v of ultrasonic waves in the 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 at 20 kHz, the wavelength λ of the ultrasonic waves 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 reflection surface 211 and the first surface 510 is set to D1 = (n1*λ) / 2 = (1*17.15) / 2 = 8.6 mm, where n1 takes 1. When n1 takes 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, when n1 takes 1, correspondingly, 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 20 kHz ≤ f ≤ 50 kHz. In actual application, the ultrasonic frequency of the vibration end 110 can also be adjusted or higher-order resonance (n1 is greater than or equal to 2) can be selected according to influencing factors such as the actual thickness of the current collector 500, the propagation speed of ultrasonic waves in the electrode active paste, and the equipment process limit distance. Moreover, during the tape running process of the current collector 500, a corresponding detection device can be set at the end position of the tape running path. This detection device is used to detect the thickness uniformity of the current collector 500, and the coating quality consistency degree of the wet film electrode sheet is fed back through the thickness uniformity degree of the end current collector 500. The ultrasonic frequency f of the vibration end 110 and / or the distance between the first reflection surface 211 and the first surface 510 are dynamically adjusted according to the coating quality consistency degree of the wet film electrode sheet to improve the leveling property of the electrode active paste on the first surface 510.

[0118] Further, referring to Figure 4 , in the region where the first surface 510 is adjacent to the main vibration region R1, two auxiliary vibration regions R2 are formed through vibration transmission. Along the tape 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 enhancement component 200 includes a fifth reflecting surface 251. The fifth reflecting surface 251 and the first reflecting surface 211 are respectively opposite to the upstream auxiliary vibration region R2 and the downstream auxiliary vibration region R2. The vertical distance L3 of the fifth reflecting surface 251 from the current collector 500, and the distance L4 of the fifth reflecting surface 251 from the vibration end 110. Along the tape 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 reflecting surface 251 and the vibration end 110 refers to the connecting line distance between the point on the fifth reflecting surface 251 and the geometric center of the vibration end 110.

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

[0122] Referring to Figure 4 , the enhancement component 200 may include a fifth reflecting plate 250. The fifth reflecting surface 251 is provided on the fifth reflecting plate 250, and the fifth reflecting surface 251 is a surface of the fifth reflecting plate 250. It is easy to understand that regardless of how the distances between the first reflecting surface 211 and the fifth reflecting surface 251 and the vibration end 110 change, the vertical distance L1 of the first reflecting surface 211 from the current collector 500 and the vertical distance L5 of the fifth reflecting surface 251 from the current collector 500 are both fixed values, and the first reflecting surface 211 and the fifth reflecting surface 251 are both parallel to the current collector 500.

[0123] It can be understood that the main vibration region R1 is located between the two auxiliary vibration regions R2 and is connected to the two auxiliary vibration regions R2. The enhancement component 200 can reflect all the ultrasonic waves of the auxiliary vibration regions R2, and make the reflected ultrasonic waves resonate with the ultrasonic waves generated by the vibration of the first surface 510 in the corresponding auxiliary vibration regions R2, so that the ultrasonic wave energy in the main vibration region R1 is similar to the ultrasonic wave energy in the adjacent upstream and downstream auxiliary vibration regions R2.

[0124] Thus, when the current collector 500 runs along the tape running direction S, it will successively run to the auxiliary vibration area R2 upstream of the main vibration area R1, the main vibration area R1, and the auxiliary vibration area R2 downstream of the main vibration area R1. Through the ultrasonic vibration generated by a single vibration end 110, in cooperation with the standing wave resonance effect formed by the first reflecting surface 211 and the fifth reflecting surface 251 of the enhancement component 200 on the corresponding auxiliary vibration area R2, the ultrasonic energy intensity of the above three continuously distributed vibration areas is relatively uniform, and there will be no large sudden change or difference in energy intensity. This not only increases the coverage area of the ultrasonic energy field with stronger energy on the first surface 510, improves the leveling efficiency of the electrode active paste on the first surface 510, but also further makes the electrode active paste on the first surface 510 flow more uniformly in the transverse and longitudinal directions, further 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 sheet.

[0125] Further, referring to Figure 4 , L1 is equal to L3.

[0126] That is, the vertical distance L3 from the fifth reflecting surface 251 to the current collector 500 is the same as the vertical distance L1 from the first reflecting surface 211 to 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 from the first reflecting surface 211 to the current collector 500 and the vertical distance L5 from the fifth reflecting surface 251 to the current collector 500 to be equal, the reflection degrees of the ultrasonic waves of the first reflecting surface 211 and the fifth reflecting surface 251 of the enhancement component 200 on the two auxiliary vibration areas R2 can be made roughly the same, so that the standing wave resonance intensities formed by the two auxiliary vibration areas R2 are basically the same. In this way, the ultrasonic energy intensity of the main vibration area R1 is further made relatively uniform with the ultrasonic energy intensities of the two auxiliary vibration areas R2 upstream and downstream of it, further 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 sheet.

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

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

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

[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 region R2, increasing the ultrasonic energy intensity on the upstream auxiliary vibration region R2, making the ultrasonic energy intensity on the upstream auxiliary vibration region R2 approach the ultrasonic energy intensity of the main vibration region R1. Combining with the enhancement effect of the first reflecting surface 211 on the ultrasonic energy intensity of the downstream auxiliary vibration region R2, the ultrasonic energy intensities of the upstream and downstream auxiliary vibration regions R2 and the ultrasonic energy intensity of the main vibration region R1 are roughly evenly distributed. During the tape running process of the current collector 500, the electrode active paste on the first surface 510 can flow more evenly in the transverse and longitudinal directions, reducing the probability of density gradient caused by the vibration energy difference between the main vibration region R1 and the auxiliary vibration regions R2, and further improving the coating quality consistency of the wet film pole piece.

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

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

[0135] Thus, increasing the ultrasonic energy intensity on the upstream auxiliary vibration region R2 to make the ultrasonic energy intensity on the upstream auxiliary vibration region R2 approach the ultrasonic energy intensity of the main vibration region R1, so that the ultrasonic energy intensity of the upstream auxiliary vibration region R2 and the ultrasonic energy intensity of the main vibration region R1 are roughly evenly distributed, enabling the current collector 500 to be subjected to the continuous and relatively evenly distributed ultrasonic energy on the main vibration region R1 and the upstream auxiliary vibration region R2 during the tape running process, making the electrode active paste on the first surface 510 flow more evenly in the transverse and longitudinal directions, reducing the probability of density gradient caused by the vibration energy difference between the main vibration region R1 and the upstream auxiliary vibration region R2, and further improving the coating quality consistency of the wet film electrode.

[0136] In some embodiments of the present application, referring to Figure 5 , the enhancement component 200 further includes a second reflection surface 221 facing the main vibration region R1. The perpendicular 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 tape 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 enhancement component 200 may include a second reflector 220, and the second reflection surface 221 is provided on the second reflector 220, and the second reflection surface 221 is a surface of the second reflector 220. The vibration end 110 can be understood as a point-like or surface-like vibration source, and the distance L6 between the second reflection surface 221 and the vibration end 110 refers to the connection distance between the point on the second reflection surface 221 and the geometric center of the vibration end 110.

[0138] It is easy to understand that regardless of how the distance L6 between the second reflection surface 221 and the vibration end 110 changes, the perpendicular distance L5 between the second reflection surface 221 and the current collector 500 is a fixed value, making the second reflection surface 221 parallel to the current collector 500.

[0139] Along the tape running direction S of the current collector 500, L6 first decreases and then increases can be understood as: defining the position point on the second reflection surface 221 facing the geometric center of the vibration end 110 as the facing position point P0. On the second reflection surface 221, the distance between the facing position point P0 and the vibration end 110 is the smallest, that is, L6 is the smallest at this time. From the direction from the facing position point P0 to the end point of the second reflection surface 221, L6 gradually increases. Defining the connection line between the facing position point P0 and the geometric center of the vibration end 110 as the first reference line X1, the second reflection surface 221 is axially symmetric with respect to the first reference line X1.

[0140] The second reflecting surface 221 faces the main vibration area R1, and the vertical projection of the second reflecting surface 221 relative to the first surface 510 covers the vertical projection of the main vibration area R1 relative to the first surface 510. In this way, the second reflecting surface 221 can reflect the ultrasonic waves propagated by the main vibration area R1 in the thickness direction of the current collector 500.

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

[0142] In addition, it should be noted that the farther the ultrasonic wave propagates in the thickness direction of the current collector 500, the greater its energy loss, and the farther away 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 reflecting surface 221 and the current collector 500 to be greater than the vertical distance L1 between the first reflecting surface 211 and the current collector 500, when at least one position point of both the first reflecting surface 211 and the second reflecting surface 221 satisfies the standing wave resonance condition, the ultrasonic energy reflected by the second reflecting surface 221 is lower than the ultrasonic energy reflected by the first reflecting surface 211, and the resonance energy on the main vibration area R1 is lower than the resonance energy on the auxiliary vibration area R2. Since the auxiliary vibration area R2 is farther away from the vibration end 110 than the main vibration area R1, the original ultrasonic energy (excluding resonance energy) of the auxiliary vibration area R2 is smaller than the original ultrasonic energy of the main vibration area R1.

[0143] In this way, while increasing the ultrasonic energy of the main vibration area R1 and the auxiliary vibration area R2 to promote the leveling of the electrode active paste, the total ultrasonic energy after the superposition of the original ultrasonic energy and the resonance energy of the main vibration area R1 is closer to the total energy after the superposition of the original ultrasonic energy and the resonance energy of the auxiliary vibration area R2. Furthermore, the ultrasonic energy intensity on the auxiliary vibration area R2 approaches the ultrasonic energy intensity of the main vibration area R1, making the ultrasonic energy intensity of the auxiliary vibration area R2 and the ultrasonic energy intensity of the main vibration area R1 roughly evenly distributed. During the tape running process of the current collector 500, the electrode active paste on the first surface 510 can flow more evenly in the transverse and longitudinal directions, 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 pole piece.

[0144] Furthermore, referring to 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 waves generated by the vibration of the main vibration area R1 to form second reflected ultrasonic waves. The second reflected ultrasonic waves have the same frequency, the same amplitude, and the opposite propagation direction as the ultrasonic waves generated by the vibration of the main vibration area R1, and form resonance.

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

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

[0147] In this way, the ultrasonic energy in the auxiliary vibration region R2 is increased to promote the leveling of the electrode active paste, and at the same time, the ultrasonic energy intensities in the main vibration region R1 and the auxiliary vibration region R2 tend to be uniform.

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

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

[0150] In addition, since the vertical distance L5 between the second reflecting surface and the current collector 500 is a fixed value, the distance between any position on it and the first surface 510 is the same, that is, any position point on the second reflecting surface 221 is the aforementioned second position point P2. In other words, the distance D2 between any position point on the second reflecting surface 221 and the first surface 510 and the wavelength λ of the ultrasonic waves generated by the vibrating end 110 both satisfy: D2 = (n2 * λ) / 2, and n2 is an integer. In this way, all the ultrasonic waves reflected by the second reflecting surface 221 reach resonance with all the corresponding initial incident waves on the main vibration region R1, increasing the ultrasonic energy intensity on the main vibration region R1 and improving the leveling effect of the electrode active paste on the first surface 510.

[0151] Similarly, referring to Figure 5, taking the second reflection surface 221 being parallel to the first surface 510 as an example, the parameter settings of the distance between the second reflection surface 221 and the first surface 510 and the ultrasonic frequency of the vibration end 110 of the vibration assembly 100 are described:

[0152] The propagation speed v of ultrasonic waves 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 at 20 kHz, the wavelength λ of the ultrasonic waves 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 reflection surface 221 and the first surface 510 is set to D2 = (n2*λ) / 2 = (1*17.15) / 2 = 8.6 mm. When n2 takes 2, D2 = 17.2 mm; when n2 takes 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, when n2 takes 2, correspondingly, D1 is 11.4 mm, 8.6 mm, and 6.8 mm respectively.

[0154] In some embodiments of the present application, refer to Figure 6 , along the tape running direction S of the current collector 500, the auxiliary vibration area R2 is located downstream of the main vibration area R1. The enhancement assembly 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 area R1 relative to the first surface 510 and covers the vertical projection of the auxiliary vibration area 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 tape running direction S of the current collector 500.

[0155] Specifically, the enhancement assembly 200 may include a third reflector 230, and the third reflection surface 231 is provided on the third reflector 230, and the third reflection surface 231 is a surface of the third reflector 230. Exemplarily, the third reflector 230 is a flat plate inclined relative to the current collector 500, or the third reflector 230 is an arc plate inclined relative to the current collector 500.

[0156] In this embodiment, when the current collector 500 runs along the tape-running direction S, it will successively run to the main vibration area R1 and the auxiliary vibration area R2 downstream of the main vibration area R1. Through the ultrasonic vibration generated by a single vibration end 110, and in cooperation with the ultrasonic energy enhancement effect of the third reflecting surface 231 on the main vibration area R1 and the auxiliary vibration area R2, the vertical distance L7 between the third reflecting surface 231 and the current collector 500 is set to gradually decrease along the tape-running direction S of the current collector 500, so that the ultrasonic energy enhancement effect of the third reflecting surface 231 on the auxiliary vibration area R2 is greater than the ultrasonic energy enhancement effect of the third reflecting surface 231 on the main vibration area R1, making the ultrasonic energy intensity of the above two continuously distributed vibration areas relatively uniform, and there will be no large sudden change or difference in energy intensity. This not only increases the coverage area of the ultrasonic energy field with stronger energy on the first surface 510, improves the leveling efficiency of the electrode active paste on the first surface 510, but also further makes the electrode active paste on the first surface 510 flow more uniformly in the transverse and longitudinal directions, further 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 pole piece.

[0157] Further, referring to Figure 6 , there is at least one third position point P3 on the area of the third reflecting surface 231 facing the auxiliary vibration area R2. The third position point P3 reflects the ultrasonic waves generated by the vibration of the auxiliary vibration area R2 to form third reflected ultrasonic waves. The third reflected ultrasonic waves have the same frequency, the same amplitude, and the opposite propagation direction as the ultrasonic waves generated by the vibration of the auxiliary vibration area R2, and form resonance.

[0158] It should be noted that the area of the third reflecting surface 231 facing the auxiliary vibration area R2 refers to the area where the vertical projection of the third reflecting surface 231 relative to the first surface 510 coincides with the vertical projection of the auxiliary vibration area R2 relative to the first surface 510. The same applies to the area of the third reflecting surface 231 facing the main vibration area R1. The ultrasonic waves generated by the vibration of the auxiliary vibration area R2 refer to the ultrasonic waves formed by the vibration transmitted from the vibration end 110 to the auxiliary vibration area R2 through the current collector 500, and can also be understood as the incident ultrasonic waves in the auxiliary vibration area R2.

[0159] The ultrasonic waves reflected by the third position point P3 on the third reflecting surface 231 form third reflected ultrasonic waves. The third reflected ultrasonic waves have the same frequency, the same amplitude, and the opposite propagation direction as the ultrasonic waves 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 assembly 100 and the distance between the third position point P3 and the first surface 510, a resonance effect can be formed for the standing wave in the auxiliary vibration area R2.

[0160] In this way, the ultrasonic energy intensity on the auxiliary vibration area R2 can also be increased, making the ultrasonic energy intensity on the auxiliary vibration area R2 approach the ultrasonic energy intensity of the main vibration area R1.

[0161] Further, referring to 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 vibrating end 110 satisfy: D3 = (n3 * λ) / 2, where n3 is an integer.

[0162] According to the acoustic resonance principle, 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 vibrating end 110 satisfy: D3 = (n3 * λ) / 2, and n3 is an integer, that is, when D3 is an integer multiple of the half wavelength, the third reflected ultrasonic wave formed by ultrasonic wave reflection at the third position point P3 and the original incident ultrasonic wave in the auxiliary vibration region R2 form a standing wave and reach 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 the present application, referring to Figure 7 , along the tape running direction S of the current collector 500, the auxiliary vibration region R2 is located upstream of the main vibration region R1. The enhancement component 200 further includes a fourth reflecting surface 241. The vertical projection of the fourth reflecting surface 241 relative to the first surface 510 covers at least a part of the vertical projection of the main vibration region R1 relative to the first surface 510, and covers the vertical projection of the auxiliary vibration region R2 relative to the first surface 510; the vertical distance L8 of the fourth reflecting surface 241 from the current collector 500 gradually increases along the tape running direction S of the current collector 500.

[0165] Specifically, the enhancement component 200 may include a fourth reflector 240, and the fourth reflecting surface 241 is provided on the fourth reflector 240, and the fourth reflecting surface 241 is a surface of the fourth reflector 240. Exemplarily, the fourth reflector 240 is a flat plate inclined relative to the current collector 500, or the fourth reflector 240 is an arc plate inclined relative to the current collector 500.

[0166] When the current collector 500 travels along the tape running direction S, it will successively travel to the auxiliary vibration area R2 upstream of the main vibration area R1 and the main vibration area R1. Through the ultrasonic vibration generated by a single vibration end 110 and in cooperation with the standing wave resonance effect formed by the enhancement component 200 on the auxiliary vibration area R2, the ultrasonic energy intensity in the above two continuously distributed vibration areas is relatively uniform, and there will be no large sudden change or difference in energy intensity. This not only increases the coverage area of the ultrasonic energy field with stronger energy on the first surface 510 and improves the leveling efficiency of the electrode active paste on the first surface 510, but also further makes the electrode active paste on the first surface 510 flow more uniformly in the transverse and longitudinal directions, further 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 sheet.

[0167] Further, referring to Figure 7 , there is at least one fourth position point P4 on the area of the fourth reflection surface 241 facing the auxiliary vibration area R2. The fourth position point P4 reflects the ultrasonic waves generated by the vibration of the auxiliary vibration area R2 to form fourth reflected ultrasonic waves. The fourth reflected ultrasonic waves have the same frequency, the same amplitude, and the opposite propagation direction as the ultrasonic waves generated by the vibration of the auxiliary vibration area R2, and form resonance.

[0168] It should be noted that the area of the fourth reflection surface 241 facing the auxiliary vibration area R2 refers to the area where the vertical projection of the fourth reflection surface 241 relative to the first surface 510 coincides with the vertical projection of the auxiliary vibration area R2 relative to the first surface 510. The same applies to the area of the fourth reflection surface 241 facing the main vibration area R1. The ultrasonic waves generated by the vibration of the auxiliary vibration area R2 refer to the ultrasonic waves formed by the vibration transmitted from the vibration end 110 to the auxiliary vibration area R2 through the current collector 500, and can also be understood as the incident ultrasonic waves in the auxiliary vibration area R2.

[0169] The ultrasonic waves reflected by the fourth position point P4 on the fourth reflection surface 241 form fourth reflected ultrasonic waves. The fourth reflected ultrasonic waves have the same frequency, the same amplitude, and the opposite propagation direction as the ultrasonic waves 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 assembly 100 and the distance between the fourth position point P4 and the first surface 510, a resonance effect can be formed in the standing wave in the auxiliary vibration area R2.

[0170] In this way, the ultrasonic energy intensity on the auxiliary vibration area R2 can also be increased, making the ultrasonic energy intensity on the auxiliary vibration area R2 approach the ultrasonic energy intensity of the main vibration area R1.

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

[0172] According to the principle of acoustic 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 vibrating end 110 satisfy: D4 = (n4 * λ) / 2, where n4 is an integer, that is, when D4 is an integer multiple of the half-wavelength, at the fourth position point P4, the fourth reflected ultrasonic wave formed by ultrasonic wave reflection and the original incident ultrasonic wave on the auxiliary vibration region R2 form a standing wave and reach resonance.

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

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

[0175] Specifically, the enhancement component 200 may include a sixth reflecting plate 260, and the sixth reflecting surface 261 is provided on the sixth reflecting plate 260, and the sixth reflecting surface 261 is a surface of the sixth reflecting plate 260.

[0176] Exemplarily, both the main vibration region R1 and the auxiliary vibration region R2 are annular, and their axes coincide, and the main vibration region R1 and the auxiliary vibration region R2 are connected.

[0177] The sixth reflecting surface 261 is in an arch shape, an arc shape, a cone shape, etc.

[0178] There is a highest position point Pmax on the sixth reflecting surface 261. The geometric center of the highest position point Pmax is directly opposite to the geometric center of the vibrating end 110. On the sixth reflecting surface 261, the vertical distance L9 between the highest position point Pmax and the current collector 500 reaches the maximum. From the highest position point Pmax to the periphery of the sixth reflecting surface 261, L9 gradually decreases.

[0179] Define the line connecting the geometric center of the highest position point Pmax and the geometric center of the vibrating end 110 as the second reference line X2, and the sixth reflecting surface 261 is axially symmetric with respect to the second reference line X2.

[0180] In the above structure, the reflection effect of the sixth reflecting surface 261 on ultrasonic waves can enhance the ultrasonic energy in the main vibration region R1 and the auxiliary vibration region R2. At the same time, the vertical distance L9 between the sixth reflecting surface 261 and the current collector 500 is set to gradually decrease along the direction from the main vibration region R1 to the auxiliary vibration region R2, so that the closer to the center of the main vibration region R1, the smaller the enhancement effect of the sixth reflecting surface 261 on ultrasonic energy. Considering that the initial ultrasonic energy of the auxiliary vibration region R2 is less than that of the main vibration region R1. In this way, the ultrasonic energy intensity of the above two continuously distributed vibration regions can also be relatively uniform, and there will be no large sudden change or difference in energy intensity. This not only increases the coverage area of the ultrasonic energy field with stronger energy on the first surface 510, improves the leveling efficiency of the electrode active paste on the first surface 510, but also further makes the electrode active paste on the first surface 510 flow more uniformly in the transverse and longitudinal directions, further reducing the probability of density gradient caused by the vibration energy difference between the main vibration region R1 and the auxiliary vibration region R2, and further improving the coating quality consistency of the wet film electrode sheet.

[0181] Further, referring to Figure 8 , there is at least one sixth position point P6 on the region of the sixth reflecting surface 261 facing the auxiliary vibration region R2. The sixth position point P6 reflects the ultrasonic waves generated by the vibration of the auxiliary vibration region R2 to form sixth reflected ultrasonic waves. The sixth reflected ultrasonic waves have the same frequency, the same amplitude, and the opposite propagation direction as the ultrasonic waves generated by the vibration of the auxiliary vibration region R2, and form resonance.

[0182] It should be noted that the region of the sixth reflecting surface 261 facing the auxiliary vibration region R2 refers to the region where the vertical projection of the sixth reflecting surface 261 relative to the first surface 510 coincides with the vertical projection of the auxiliary vibration region R2 relative to the first surface 510. The same applies to the region of the sixth reflecting surface 261 facing the main vibration region R1. The ultrasonic waves generated by the vibration of the auxiliary vibration region R2 refer to the ultrasonic waves formed by the vibration transmitted from the vibrating end 110 to the auxiliary vibration region R2 through the current collector 500, and can also be understood as the incident ultrasonic waves in the auxiliary vibration region R2.

[0183] The ultrasonic waves reflected by the sixth position point P6 on the sixth reflecting surface 261 form sixth reflected ultrasonic waves. The sixth reflected ultrasonic waves have the same frequency, the same amplitude, and the opposite propagation direction as the ultrasonic waves generated by the vibration of the auxiliary vibration region R2, forming a standing wave. By adjusting the excitation frequency of the vibrating end 110 of the vibration assembly 100 and the distance between the sixth position point P6 and the first surface 510, a resonance effect can be formed in the standing wave in the auxiliary vibration region R2.

[0184] In this way, the ultrasonic energy intensity on the auxiliary vibration region R2 can also be increased, making the ultrasonic energy intensity on the auxiliary vibration region R2 approach the ultrasonic energy intensity of the main vibration region R1.

[0185] Further, referring to Figure 8, 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, where n6 is an integer.

[0186] According to the principle of acoustic 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 an integer multiple of half the wavelength, the sixth reflected ultrasonic wave formed by ultrasonic reflection at the sixth position point (P6) and the original incident ultrasonic wave on the auxiliary vibration area R2 form a standing wave and reach resonance.

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

[0188] See 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 an arc surface structure tangent to the second surface 520, and the arc curvature corresponding to the arc surface structure approaches 0.

[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, the frictional influence of the vibration end 110 on the second surface 520 can be reduced, so that the current collector 500 can smoothly run along the tape running direction S. At the same time, the vibration end 110 can also stably transfer the vibration energy to the electrode active paste on the current collector 500 and its first surface 510, promoting the uniform leveling of the electrode active paste 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 paste on the first surface 510.

[0192] See Figure 1 , in some embodiments of the present application, the electrode sheet manufacturing device further includes a coating device 300 and a drying device 400 provided on the tape running path of the current collector 500. The vibration assembly 100 is provided between the coating device 300 and the drying device 400. The coating device 300 is used to coat the electrode active paste on the first surface 510, and the drying device 400 is used to dry the electrode active paste on the first surface 510.

[0193] Specifically, the coating device 300 can be a slit extrusion coating head or a microgravure coating device. The coating device 300 can uniformly coat the electrode active paste on the first surface 510 of the current collector 500 to form a wet film electrode sheet. The drying device 400 can be an oven capable of feeding the wet film electrode sheet, and the drying device 400 is used to dry the wet electrode active paste on the wet film electrode sheet, evaporate the solvent in the electrode active paste, and form a dry electrode sheet.

[0194] It can be understood that after the initial current collector 500 is coated by the coating device 300 to form a wet film electrode sheet, the wet film electrode sheet continues to travel along the tape traveling direction S to the matching position of the vibration assembly 100 and the enhancement assembly 200. After being vibrated by the ultrasonic energy of the continuously distributed main vibration area R1 and the auxiliary vibration area R2 to promote leveling, a wet film electrode sheet with higher coating quality consistency is formed, and then it continues to travel to the drying device 400. The drying device 400 dries the wet film electrode sheet to obtain a dry electrode sheet. In this way, an electrode sheet with higher coating quality consistency is manufactured.

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

[0196] The battery production system of the embodiment of the present application is configured with the above-mentioned electrode sheet manufacturing equipment, so it also has the same technical effects brought by the electrode sheet manufacturing equipment, that is, it can manufacture an electrode sheet with higher coating quality consistency, and correspondingly improve the battery capacity consistency.

[0197] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0198] The above embodiments only represent several implementation manners of the present application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A pole piece manufacturing device, characterized in that, Including: A vibration component is provided on the tape-running path of the current collector. The current collector has a first surface and a second surface opposite to each other in the thickness direction of itself. The first surface is coated with an undried electrode active paste. The vibrating end of the vibration component is arranged on one side close to the second surface of the current collector and generates ultrasonic waves through its own vibration, so that a main vibration area is formed in the area where the first surface faces the vibrating end, and an auxiliary vibration area is formed by vibration transmission in the area adjacent to the main vibration area on the first surface; An enhancement component, at least part of the enhancement component is arranged above the auxiliary vibration area and is configured to at least reflect the ultrasonic waves 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.

2. The pole piece manufacturing equipment according to claim 1, characterized in that, The enhancement component includes a first reflection surface facing the auxiliary vibration area. The perpendicular distance L1 from the first reflection surface to the current collector, and the distance L2 from the first reflection surface to the vibrating end. Along the tape-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 reflection surface. The first position point reflects the ultrasonic waves generated by the vibration in the auxiliary vibration area to form first reflected ultrasonic waves. The first reflected ultrasonic waves have the same frequency, the same amplitude, and the opposite propagation direction as the ultrasonic waves generated by the vibration in the auxiliary vibration area, and form resonance.

4. The electrode sheet manufacturing apparatus 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 waves generated by the vibrating end satisfy: D1 = (n1 * λ) / 2, where n1 is an integer.

5. The pole piece manufacturing device according to claim 2, wherein The area adjacent to the main vibration area on the first surface forms two auxiliary vibration areas through vibration transmission. Along the tape-running direction of the current collector, the two auxiliary vibration areas are respectively located upstream and downstream of the main vibration area; The enhancement component includes a fifth reflection surface. The fifth reflection surface and the first reflection surface are respectively opposite to the upstream auxiliary vibration area and the downstream auxiliary vibration area. The perpendicular distance L3 from the fifth reflection surface to the current collector, and the distance L4 from the fifth reflection surface to the vibrating end. Along the tape-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, L1 is equal to L3.

7. The pole piece manufacturing equipment according to claim 5, characterized in that, The fifth reflection surface has at least one fifth position point. The fifth position point reflects the ultrasonic waves generated by the vibration in the upstream auxiliary vibration area to form fifth reflected ultrasonic waves. The fifth reflected ultrasonic waves have the same frequency, the same amplitude, and the opposite propagation direction as the ultrasonic waves generated by the vibration in the upstream auxiliary vibration area, and form resonance.

8. The pole piece manufacturing device according to claim 7, wherein, The distance D5 between the fifth position point and the first surface and the wavelength λ of the ultrasonic waves generated by the vibrating end satisfy: 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 enhanced component further includes a second reflecting surface facing the main vibration area. The perpendicular distance from the second reflecting surface to the current collector is L5, and the distance from the second reflecting surface to the vibrating 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.

10. The pole piece manufacturing device according to claim 9, wherein There is at least one second position point on the second reflecting surface. The second position point reflects the ultrasonic waves generated by the vibration of the main vibration area to form second reflected ultrasonic waves. The second reflected ultrasonic waves have the same frequency, the same amplitude, and the opposite propagation direction as the ultrasonic waves generated by the vibration of the main vibration area, and form resonance.

11. The pole piece manufacturing device 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 waves generated by the vibrating end satisfy: D2 = (n2 * λ) / 2, where n2 is an integer.

12. The pole piece manufacturing equipment according to claim 1, wherein Along the running direction of the current collector, the auxiliary vibration area is located downstream of the main vibration area. The enhanced component further includes a third reflecting surface. The perpendicular projection of the third reflecting surface on the first surface covers at least part of the perpendicular projection of the main vibration area on the first surface and covers the perpendicular projection of the auxiliary vibration area on the first surface. The perpendicular distance from the third reflecting surface to the current collector is L7. Along the running direction of the current collector, L7 gradually decreases.

13. The pole piece manufacturing device according to claim 12, characterized in that, There is at least one third position point on the area of the third reflecting surface facing the auxiliary vibration area. The third position point reflects the ultrasonic waves generated by the vibration of the auxiliary vibration area to form third reflected ultrasonic waves. The third reflected ultrasonic waves have the same frequency, the same amplitude, and the opposite propagation direction as the ultrasonic waves generated by the vibration of the auxiliary vibration area, and form resonance.

14. The pole piece manufacturing device 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 waves generated by the vibrating end satisfy: D3 = (n3 * λ) / 2, where n3 is an integer.

15. The pole piece manufacturing equipment according to claim 1, wherein Along the running direction of the current collector, the auxiliary vibration area is located upstream of the main vibration area. The enhanced component further includes a fourth reflecting surface. The perpendicular projection of the fourth reflecting surface on the first surface covers at least part of the perpendicular projection of the main vibration area on the first surface and covers the perpendicular projection of the auxiliary vibration area on the first surface. The perpendicular distance from the fourth reflecting surface to the current collector is L8. Along the running direction of the current collector, L8 gradually increases.

16. The pole piece manufacturing equipment according to claim 15, wherein There is at least one fourth position point on the area of the fourth reflecting surface facing the auxiliary vibration area. The fourth position point reflects the ultrasonic waves generated by the vibration of the auxiliary vibration area to form fourth reflected ultrasonic waves. The fourth reflected ultrasonic waves have the same frequency, the same amplitude, and the opposite propagation direction as the ultrasonic waves generated by the vibration of the auxiliary vibration area, and form resonance.

17. The pole piece manufacturing equipment according to claim 16, wherein, The distance D4 between the fourth position point and the first surface and the wavelength λ of the ultrasonic waves generated by the vibrating end satisfy: 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 area surrounds the main vibration area, and the enhancement component includes a sixth reflecting surface. The perpendicular projection of the sixth reflecting surface relative to the first surface covers the perpendicular projections of the main vibration area and the auxiliary vibration area relative to the first surface. The perpendicular distance L9 between the sixth reflecting surface and the current collector gradually decreases along the direction from the main vibration area towards the auxiliary vibration area.

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

20. The pole piece manufacturing device 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 waves generated by the vibrating end satisfy: 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 vibrating end is tangent to the second surface, and the width of the vibrating end is greater than or equal to the 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 pole piece manufacturing device further includes a coating device and a drying device arranged on the running path of the current collector. The vibration component is arranged between the coating device and the drying device. The coating device is used to coat the electrode active paste on the first surface, and the drying device is used to dry the electrode active paste on the first surface.

23. A battery production system, characterized in that, It includes the pole piece manufacturing device according to any one of claims 1 to 22.

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