Pole piece coating equipment and battery production system

Abstract

The utility model relates to pole piece coating equipment and a battery production system. The pole piece coating equipment comprises a conveying mechanism, a coating mechanism and an air blowing mechanism, the conveying mechanism is used for conveying pole pieces; the coating mechanism is used for coating slurry on the pole piece; the blowing mechanism and the coating mechanism are sequentially distributed in the belt conveying direction of the conveying mechanism, the blowing mechanism comprises an ultrasonic generator and air uniformizing pieces, the two sides of the ultrasonic generator are each provided with one air uniformizing piece in the belt conveying direction, the ultrasonic generator is used for vibrating air in the air uniformizing pieces so as to generate same-frequency vibration airflow, and each air uniformizing piece is provided with an air outlet. And the air outlet is arranged towards the pole piece conveyed by the conveying mechanism and extends along the width direction of the pole piece. According to the pole piece coating equipment, when the pole piece is conveyed to the coating mechanism, the slurry is coated on the pole piece by the coating mechanism. The blowing mechanism can blow airflow carrying same-frequency oscillation to the pole piece, resonance is generated on the pole piece, and the uniformity and stability of slurry coating are improved.

Description

Technical Field

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

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

[0003] During the manufacturing process of batteries, coating equipment is required to coat slurries on battery pole pieces. After the slurries are coated on the pole pieces, a series of treatments such as drying are still needed. If the finally obtained slurries are unevenly distributed on the pole pieces, the performance of the pole pieces will be affected. Therefore, there is an urgent need for a pole piece coating device that can improve the forming of slurries. Summary of the Utility Model

[0004] In view of the above problems, the present application provides a pole piece coating device and a battery production system, which can alleviate the problem of uneven distribution when the slurry is coated on the pole piece.

[0005] In a first aspect, the present application provides a pole piece coating device, which includes a conveying mechanism, a coating mechanism, and a blowing mechanism. The conveying mechanism is used to convey the pole piece; the coating mechanism is used to coat the slurry on the pole piece; the blowing mechanism and the coating mechanism are sequentially distributed along the running direction of the conveying mechanism. The blowing mechanism includes an ultrasonic generator and a uniform air distribution member. Along the running direction, a uniform air distribution member is provided on both sides of the ultrasonic generator. The ultrasonic generator is used to vibrate the gas in the uniform air distribution member to generate a co-frequency vibration air flow. Each uniform air distribution member is provided with an air outlet, and the air outlet is arranged towards the pole piece conveyed by the conveying mechanism and extends along the width direction of the pole piece.

[0006] In the technical solution of the embodiment of the present application, when the pole piece is conveyed to the coating mechanism, the coating mechanism coats the slurry on the pole piece. The blowing mechanism can blow a co-frequency oscillating air flow towards the pole piece and generate resonance on the pole piece. Because the ultrasonic vibration energy carried by the wind blowing towards the slurry can resist the aggregation force of the particulate matter in the slurry, making the slurry tend to be dispersed evenly into a thin layer and making the particulate matter in the slurry tend to be balanced and stable, thereby improving the uniformity and stability of the slurry coating.

[0007] In addition, because the air outlet extends along the width direction of the pole piece, the air pressures conveyed from each part of the air outlet are substantially equal. Therefore, the intensities of the winds blowing towards each part of the pole piece are substantially equal, which can make the slurry be coated on the pole piece more evenly.

[0008] In some embodiments, an air chamber is provided inside the air equalizing member. The air chamber extends along the width direction of the pole piece and is communicated with the air outlet. At least part of the ultrasonic generator is located inside the air chamber, and the ultrasonic generator vibrates along the tape running direction.

[0009] After the outside air enters the air chamber, it can initially stabilize the pressure of the air chamber and make the air pressure in each part of the air chamber approximately the same. As the air in the air chamber flows towards the ultrasonic generator, since most of the ultrasonic generator is located inside the air chamber, the contact area between the ultrasonic generator and the air in the air chamber is increased, thereby improving the action of the ultrasonic generator on the air in the air chamber and making it have a co-frequency oscillating air flow.

[0010] In some embodiments, the air blowing mechanism further includes an air inlet. Along the width direction of the pole piece, the air inlet is provided at the end of the air equalizing member and is communicated with the air chamber.

[0011] When the air equalizing member operates, the outside air enters the air equalizing member from the air inlet. The air in the air chamber of the air equalizing member can first flow along the width direction of the pole piece and then flow towards the ultrasonic generator. The way of introducing air along the width direction of the pole piece can reduce the air inlet resistance, make the air flow distribution in the air chamber more uniform, and also reduce the degree of vortex generation.

[0012] In some embodiments, the air chamber includes a first sub-air chamber and a second sub-air chamber. The first sub-air chamber and the second sub-air chamber are spaced apart along the height direction, and there is a gap between the first sub-air chamber and the second sub-air chamber;

[0013] Among them, the first sub-air chamber is communicated with the air inlet, and the second sub-air chamber is communicated with the air outlet and the ultrasonic generator. The height direction, the width direction of the pole piece, and the tape running direction are perpendicular to each other in pairs.

[0014] With such a setting, after stabilizing the air pressure in the air chamber of the air equalizing member twice, the ultrasonic generator can be used to vibrate the gas in the second sub-air chamber. In this way, the probability of the occurrence of the phenomenon of turbulence can be reduced while increasing the pressure of the obtained air.

[0015] In some embodiments, the number of gaps is multiple, and all the gaps are spaced apart along the width direction of the pole piece.

[0016] Because there are multiple gaps, the gas in the first sub-air chamber can enter the second sub-air chamber from different gaps, which speeds up the amount of gas entering the second sub-air chamber from the first sub-air chamber at one time.

[0017] In some embodiments, the ultrasonic generator includes a housing and a generator body. The generator body is provided inside the housing, and the housing and the air equalizing member jointly form the first sub-air chamber.

[0018] When the housing and the air distribution member are assembled together, the inner walls of the formed integral body can jointly form a first sub-air chamber. Compared with only opening the first sub-air chamber in the air distribution member, the volume of the first sub-air chamber can be enlarged, thereby increasing the air storage capacity of the first sub-air chamber. In this way, the first sub-air chamber can supply the second sub-air chamber with the stabilized air for a long time and supply it to the second sub-air chamber in a timely manner.

[0019] In some embodiments, the housing is provided with an air inlet, and along the width direction of the electrode plate, the air inlet is located at one end of the housing.

[0020] When the air distribution member operates, the outside air can enter the first sub-air chamber from both the air inlet of the housing and the air inlet of the air distribution member at the same time, accelerating the speed of the outside air entering the first sub-air chamber and accelerating the operating speed of the air blowing mechanism.

[0021] In some embodiments, the number of ultrasonic generators and air distribution members is multiple, and all the ultrasonic generators and air distribution members are arranged along the tape running direction, and an air distribution member is provided on each side of each ultrasonic generator.

[0022] In this way, the number of ultrasonic generators and air distribution members of the air blowing mechanism can be adjusted according to the amount of slurry on the electrode plate, so as to change the air discharge amount of the air blowing mechanism, so as to better blow the slurry on the electrode plate and make the slurry evenly coated on the electrode plate.

[0023] In some embodiments, the ultrasonic generator and the air distribution member are detachably connected.

[0024] When any one of the ultrasonic generator and the air distribution member is damaged, only the damaged component needs to be replaced, which is equivalent to replacing the ultrasonic generator and the air distribution member together, reducing the maintenance cost.

[0025] In some embodiments, the straight-line distance between the air outlet and the electrode plate is L, and the range of L is 1 mm to 3 mm.

[0026] With such a setting, by controlling the straight-line distance between the air outlet and the electrode plate, the air with the required wind force and vibration frequency can be obtained to better blow the slurry on the electrode plate.

[0027] In a second aspect, the present application provides a battery production system, which includes the electrode plate coating equipment and the drying equipment in the above embodiments, and the coating mechanism, the air blowing mechanism and the drying equipment are sequentially distributed along the tape running direction.

[0028] 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 implementation manners of the present application. Brief Description of the Drawings

[0029] Upon 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 accompanying drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Moreover, in all the drawings, the same reference numerals are used to denote the same components. In the drawings:

[0030] Figure 1 is a schematic structural diagram of a pole piece coating device according to one or more embodiments.

[0031] Figure 2 is a schematic structural diagram of a blowing mechanism of a pole piece coating device according to one or more embodiments.

[0032] Figure 3 is an exploded view of a blowing mechanism of a pole piece coating device according to one or more embodiments.

[0033] Figure 4 is Figure 3 an enlarged view of part A in

[0034] Figure 5 is an exploded view of a blowing mechanism of a pole piece coating device from another perspective according to one or more embodiments.

[0035] The reference numerals in the specific embodiments are as follows:

[0036] 100, pole piece coating device; 10, conveying mechanism; 20, coating mechanism; 30, blowing mechanism; 31, ultrasonic generator; 311, housing; 312, generator body; 32, air distribution member; 321, air outlet; 322, air chamber; 3221, first sub-air chamber; 3222, second sub-air chamber; 33, air inlet; 34, gap; 200, pole piece; 300, drying device; X, tape running direction; Y, width direction; Z, height direction. Specific Embodiments

[0037] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly and therefore are only examples and cannot be used to limit the protection scope of the present application.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0039] In the description of the embodiments of the present application, if technical terms such as "first" and "second" appear, they are only used to distinguish different objects, and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is more than two, unless otherwise specifically defined.

[0040] Reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0041] In the description of the embodiments of the present application, if the term "and / or" appears, it is merely a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, if the character " / " appears herein, generally it means that the associated objects before and after are in an "or" relationship.

[0042] In the description of the embodiments of the present application, if the term "a plurality of" appears, it means more than two (including two). Similarly, "a plurality of groups" means more than two groups (including two groups), and "a plurality of pieces" means more than two pieces (including two pieces).

[0043] In the description of the embodiments of the present application, if technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation on the embodiments of the present application.

[0044] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, if technical terms such as "installation", "connection", "connection", "fixation", etc. appear, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0045] At present, from the perspective of the development of the market situation, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric transportation such as electric bicycles, electric motorcycles, and electric vehicles, as well as in many fields such as military equipment and aerospace. With the continuous expansion of the application fields of power batteries, the market demand is also continuously increasing.

[0046] A battery includes an electrode assembly, which is a component in the battery where an electrochemical reaction occurs. The electrode assembly is mainly formed by winding or laminating a positive electrode sheet and a negative electrode sheet. At present, the manufacturing cost of the electrode sheet is relatively high.

[0047] When manufacturing the electrode sheet, it is necessary to coat the slurry. After the slurry is coated on the electrode sheet and before entering the drying equipment, generally a air knife is used to blow the slurry on the electrode sheet, so that the slurry can be evenly distributed on the electrode sheet. However, when the air blown by the air knife reaches different parts of the electrode sheet, the pressure exerted on the slurry at different parts is different, thus easily resulting in the problem of uneven distribution of the slurry on the electrode sheet.

[0048] To solve the technical problem of uneven distribution of the slurry on the electrode sheet, some embodiments of the present application provide an electrode sheet coating device. The air blowing mechanism of the electrode sheet coating device includes an ultrasonic generator and a wind homogenizing member. A wind homogenizing member is provided on both sides of the ultrasonic generator, and the wind homogenizing member extends along the width direction of the electrode sheet. The ultrasonic generator can vibrate the air in the wind homogenizing member and carry a co-frequency oscillating air flow when discharging from the air outlet. In this way, the air blowing towards different parts of the electrode sheet resonates, and the slurry on the electrode sheet can be evenly blown, improving the uniformity of slurry coating.

[0049] The electrode sheet coating device provided by the embodiments of the present application can be applied to scenarios such as manufacturing positive electrode sheets, negative electrode sheets, flexible printed circuit boards, brightening films, polarizing films, and diffusion films.

[0050] Please refer to Figure 1 and Figure 2 , some embodiments of the present application provide an electrode sheet coating device 100, which includes a conveying mechanism 10, a coating mechanism 20, and an air blowing mechanism 30. The conveying mechanism 10 is used to convey the electrode sheet 200, and the coating mechanism 20 is used to coat the slurry on the electrode sheet 200; the air blowing mechanism 30 and the coating mechanism 20 are sequentially distributed along the running direction X of the conveying mechanism 10. The air blowing mechanism 30 includes an ultrasonic generator 31 and a wind homogenizing member 32. Along the running direction X, a wind homogenizing member 32 is provided on both sides of the ultrasonic generator 31. The ultrasonic generator 31 is used to vibrate the gas in the wind homogenizing member 32 to generate a co-frequency vibrating air flow. Each wind homogenizing member 32 is provided with an air outlet 321, and the air outlet 321 is arranged facing the electrode sheet 200 conveyed by the conveying mechanism 10 and extends along the width direction Y of the electrode sheet 200.

[0051] The structure of the conveying mechanism 10 can be but is not limited to roller transmission or belt transmission. The conveying mechanism 10 can be arranged between multiple workstations to convey the pole piece 200 between the multiple workstations, facilitating the components at these workstations to operate on the pole piece 200. The coating mechanism 20 includes components such as a coating die head. The coating mechanism 20 is used to coat the slurry on the pole piece 200 conveyed by the conveying mechanism 10. The slurry can form a film layer on the surface of the pole piece 200. The material of the slurry can include but is not limited to lithium-containing phosphates, lithium transition metal oxides and their respective modified compounds, artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc.

[0052] The air blowing mechanism 30 is used to blow air to the pole piece 200 conveyed by the conveying mechanism 10 to purge the slurry coated on the pole piece 200, making the surface of the slurry on the pole piece 200 flat. When the ultrasonic generator 31 operates, it can generate sound waves with a frequency higher than 20KHz. These sound waves can process the air in the air homogenizing member 32, making the air discharged from the air outlet 321 carry the vibration waves of the same-frequency oscillating air current.

[0053] The working principle of the coating equipment will be described below in conjunction with a specific embodiment.

[0054] Assume that the conveying mechanism 10 operates between the coating workstation and the drying workstation. The conveying mechanism 10 includes a plurality of rollers distributed at intervals. All the rollers jointly support the pole piece 200 to convey the pole piece 200. The coating mechanism 20 and the air blowing mechanism 30 are distributed along the running direction X of the conveying mechanism 10. The air blowing mechanism 30 is fixed above the roller by a bracket and blows air to the roller to act on the pole piece 200 on the roller.

[0055] When the pole piece 200 is conveyed to the coating mechanism 20, the coating mechanism 20 coats the slurry on the pole piece 200. The air blowing mechanism 30 can blow the same-frequency oscillating air current to the pole piece 200 and generate resonance on the pole piece 200. Because the ultrasonic vibration energy carried by the air blowing towards the slurry can resist the agglomeration force of the particulate matter in the slurry, making the slurry tend to be dispersed evenly into a thin layer and making the particulate matter in the slurry tend to be balanced and stable, thereby improving the uniformity and stability of the slurry coating.

[0056] In addition, because the air outlet 321 extends along the width direction Y of the pole piece 200, the air pressures conveyed from each part of the air outlet 321 are approximately equal. Therefore, the intensities of the air blowing towards each part of the pole piece 200 are approximately equal, enabling the slurry to be coated on the pole piece 200 more evenly.

[0057] It should be noted that the coating speed of the coating mechanism 20 and the vibration frequency of the ultrasonic generator 31 can be within a suitable range to obtain better effects. For example, when performing the coating of the lithium iron system, the speed of the coating mechanism 20 can be less than 50 m / min, and the vibration frequency of the ultrasonic generator 31 is between 20 KHz and 30 KHz. When performing the coating of the ternary system, the coating speed of the coating mechanism 20 is between 70 m / min and 90 m / min, and the vibration frequency of the ultrasonic generator 31 is between 30 KHz and 45 KHz. Usually, the vibration frequency of the ultrasonic generator 31 can be controlled at about 30 KHz.

[0058] As Figure 3 shown, in some embodiments, an air chamber 322 is provided inside the air equalizing member 32. The air chamber 322 extends along the width direction Y of the electrode sheet 200 and is communicated with the air outlet 321. At least a part of the ultrasonic generator 31 is located inside the air chamber 322, and the ultrasonic generator 31 vibrates along the tape running direction X.

[0059] Exemplarily, a receiving cavity is formed inside the air equalizing member 32, and the receiving cavity is configured as the air chamber 322.

[0060] When the outside air enters the air chamber 322, it can initially stabilize the pressure of the air chamber 322 and make the air pressure in each part of the air chamber 322 approximately the same. As the air in the air chamber 322 flows towards the ultrasonic generator 31, since most of the ultrasonic generator 31 is located inside the air chamber 322, the contact area between the ultrasonic generator 31 and the air in the air chamber 322 is increased, thereby enhancing the effect of the ultrasonic generator 31 on the air in the air chamber 322 to make it have a co-frequency oscillating air flow.

[0061] Please refer to Figure 3 , in some embodiments, the air blowing mechanism 30 further includes an air inlet 33. Along the width direction Y of the electrode sheet 200, the air inlet 33 is provided at the end of the air equalizing member 32 and is communicated with the air chamber 322.

[0062] For example, the air equalizing member 32 extends along the width direction Y of the electrode sheet 200 and has two end portions, and the air inlet 33 is located at at least one end portion. In other words, the air inlet 33 is provided at one end portion, or the air inlets 33 are provided at both end portions.

[0063] When the air equalizing member 32 operates, the outside air enters the air equalizing member 32 from the air inlet 33. The air in the air chamber 322 inside the air equalizing member 32 can first flow along the width direction Y of the electrode sheet 200 and then flow towards the direction of the ultrasonic generator 31. The air inlet mode along the width direction Y of the electrode sheet 200 can reduce the air inlet resistance, make the air flow distribution in the air chamber 322 more uniform, and also reduce the degree of vortex generation.

[0064] Please continue to refer toFigure 3 and Figure 4 In some embodiments, the air chamber 322 includes a first sub-air chamber 3221 and a second sub-air chamber 3222. The first sub-air chamber 3221 and the second sub-air chamber 3222 are spaced apart along the height direction Z. A gap 34 is provided between the first sub-air chamber 3221 and the second sub-air chamber 3222. Among them, the first sub-air chamber 3221 is communicated with the air inlet 33, the second sub-air chamber 3222 is communicated with the air outlet 321 and the ultrasonic generator 31. The height direction Z, the width direction Y of the pole piece 200, and the tape running direction X are perpendicular to each other in pairs.

[0065] The functions of the first sub-air chamber 3221 and the second sub-air chamber 3222 are the same, both for voltage stabilization, and their shapes can be similar. The first sub-air chamber 3221 and the second sub-air chamber 3222 are communicated through the gap 34. The shape of the gap 34 can be, but is not limited to, rectangular or circular.

[0066] Exemplarily, as Figure 3 shown, the first sub-air chamber 3221 and the second sub-air chamber 3222 are spaced apart along the height direction Z and are communicated through the gap 34.

[0067] When the outside air enters the first sub-air chamber 3221, it will be voltage-stabilized for the first time. The air in the first sub-air chamber 3221 then enters the second sub-air chamber 3222 through different gaps 34. Since the size of the gap 34 is smaller than the size of the air inlet 33, the air entering the second sub-air chamber 3222 can be voltage-stabilized and shunted again through these gaps 34. Subsequently, under the oscillation in the slit with an amplitude of 5 μm to 50 μm generated by the ultrasonic generator 31, the air discharged from the air outlet 321 forms a co-frequency oscillating air flow.

[0068] With such a setting, after the air in the air distribution member 32 is voltage-stabilized twice, the ultrasonic generator 31 can be used to vibrate the gas in the second sub-air chamber 3222. In this way, the probability of the occurrence of the phenomenon of reducing turbulence can be reduced while increasing the pressure of the obtained air.

[0069] Specifically, in some embodiments, the number of the gaps 34 is multiple, and all the gaps 34 are spaced apart along the width direction Y of the pole piece 200.

[0070] The shape of each gap 34 can be configured as a strip. Since there are multiple gaps 34, the gas in the first sub-air chamber 3221 can enter the second sub-air chamber 3222 from different gaps 34, which speeds up the amount of gas entering the second sub-air chamber 3222 from the first sub-air chamber 3221 at one time.

[0071] Such as Figure 5As shown, in some embodiments, the ultrasonic generator 31 includes a housing 311 and a generator body 312. The generator body 312 is disposed within the housing 311, and the housing 311 and the air distribution member 32 together form a first sub-air chamber 3221.

[0072] The housing 311 is used to mount the generator body 312 and is connected to the air distribution member 32. The connection manner between the housing 311 and the air distribution member 32 may be, but is not limited to, threaded connection or snap connection.

[0073] When the housing 311 and the air distribution member 32 are assembled together, the inner walls of the formed integral body can jointly form the first sub-air chamber 3221. Compared with only providing the first sub-air chamber 3221 within the air distribution member 32, the volume of the first sub-air chamber 3221 can be enlarged, thereby increasing the air storage capacity of the first sub-air chamber 3221. In this way, the first sub-air chamber 3221 can supply the regulated air to the second sub-air chamber 3222 for a long time and supply it to the second sub-air chamber 3222 in a timely manner.

[0074] Further, in some embodiments, the housing 311 is provided with an air inlet 33. Along the width direction Y of the pole piece 200, the air inlet 33 is located at one end of the housing 311.

[0075] When the air distribution member 32 operates, the outside air can enter the first sub-air chamber 3221 from both the air inlet 33 of the housing 311 and the air inlet 33 of the air distribution member 32 simultaneously, accelerating the speed at which the outside air enters the first sub-air chamber 3221 and accelerating the operating speed of the air blowing mechanism 30.

[0076] In some embodiments, the number of the ultrasonic generators 31 and the air distribution members 32 is multiple. All the ultrasonic generators 31 and the air distribution members 32 are arranged along the tape running direction X, and one air distribution member 32 is provided on each side of each ultrasonic generator 31.

[0077] As Figure 5 shown, in some examples, the air blowing mechanism 30 includes two ultrasonic generators 31 and three air distribution members 32. The ultrasonic generators 31 and the air distribution members 32 are arranged in a cross manner, and one air distribution member 32 is provided on each side of each ultrasonic generator 31.

[0078] In other examples, the air blowing mechanism 30 includes three ultrasonic generators 31 and five air distribution members 32. The ultrasonic generators 31 and the air distribution members 32 are also arranged in a cross manner, and one air distribution member 32 is provided on each side of each ultrasonic generator 31.

[0079] It should be noted that the number of the ultrasonic generators 31 and the air distribution members 32 can be determined according to the actual situation. When the number of the ultrasonic generators 31 is multiple, two adjacent ultrasonic generators 31 share the air distribution member 32 located between them.

[0080] Thus, the number of the ultrasonic generators 31 and the air distributing members 32 of the air blowing mechanism 30 can be adjusted according to the amount of the slurry on the electrode sheet 200, so as to change the air discharge amount of the air blowing mechanism 30, and better blow the slurry on the electrode sheet 200, so that the slurry is evenly coated on the electrode sheet 200.

[0081] Specifically, in some embodiments, the ultrasonic generator 31 and the air distributing member 32 are detachably connected.

[0082] The connection between the ultrasonic generator 31 and the air distributing member 32 can be, but is not limited to, snap connection or threaded connection.

[0083] When any one of the ultrasonic generator 31 and the air distributing member 32 is damaged, only the damaged component needs to be replaced, which is equivalent to replacing the ultrasonic generator 31 and the air distributing member 32 together, reducing the maintenance cost.

[0084] In some embodiments, the linear distance between the air outlet 321 and the electrode sheet 200 is L, and the range of L is 1 mm to 3 mm. The value of L can be 1 mm, 1.2 mm, 2 mm, 2.5 mm, 3 mm, and any value between two adjacent values.

[0085] The air discharged from the air outlet 321 directly blows onto the electrode sheet 200 on the conveying mechanism 10. If the linear distance between the air outlet 321 and the electrode sheet 200 is too large, the attenuation of the ultrasonic wave will be relatively fast, and the vibration efficiency will drop sharply, thus affecting the coating effect of the slurry. If the linear distance between the air outlet 321 and the electrode sheet 200 is too small, the slurry on the electrode sheet 200 will be overblown, resulting in uneven coating of the slurry.

[0086] Therefore, by controlling the linear distance between the air outlet 321 and the electrode sheet 200, air with the required wind force and vibration frequency can be obtained to better blow the slurry on the electrode sheet 200.

[0087] In addition, some embodiments of the present application further provide a battery production system, which includes the electrode sheet coating device 100 and the drying device 300 in the above embodiments, and the coating mechanism 20, the air blowing mechanism 30, and the drying device 300 are sequentially distributed along the tape running direction X.

[0088] The drying device 300 is used to dry the electrode sheet 200 after being processed by the coating mechanism 20 and the air blowing mechanism, so as to accelerate the drying speed of the slurry on the electrode sheet 200.

[0089] Since the battery production system includes the electrode sheet coating device 100 in the above embodiments, the battery production system has all the beneficial effects of the electrode sheet coating device 100, which will not be elaborated herein.

[0090] Such as Figures 1 to 3, Specifically in one embodiment, the electrode sheet coating device 100 includes a conveying mechanism 10, a coating mechanism 20, and a blowing mechanism 30. The blowing mechanism 30 includes an ultrasonic generator 31 and two air homogenizing members 32. The two air homogenizing members 32 are distributed on both sides of the ultrasonic generator 31 along the tape running direction X. Both the air homogenizing member 32 and the ultrasonic generator 31 are provided with air inlets 33. The interior of the air homogenizing member 32 is provided with an air chamber 322 and an air outlet 321. Among them, the air chamber 322, the air inlet 33, and the air outlet 321 are connected. The air outlet 321 is arranged facing the electrode sheet 200 conveyed by the conveying mechanism 10 and extends along the width direction Y of the electrode sheet 200.

[0091] When the electrode sheet 200 is conveyed to the coating mechanism 20, the coating mechanism 20 coats the slurry on the electrode sheet 200. The blowing mechanism 30 can blow a co-frequency oscillating airflow onto the electrode sheet 200 and generate resonance on the electrode sheet 200. Because the ultrasonic vibration energy carried by the air blowing onto the slurry can resist the agglomeration force of the particulate matter in the slurry, making the slurry tend to be dispersed into a uniform thin layer and making the particulate matter in the slurry tend to be balanced and stable, thereby improving the uniformity and stability of the slurry coating.

[0092] In addition, because the air outlet 321 extends along the width direction Y of the electrode sheet 200, the air pressures delivered from each part of the air outlet 321 are approximately equal. Therefore, the intensities of the air blowing onto each part of the electrode sheet 200 are approximately equal, enabling the slurry to be coated on the electrode sheet 200 more uniformly.

[0093] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope described in this specification.

[0094] The above-described embodiments only represent several implementation manners of the present application. 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 coating device, characterized in that: include: A conveying mechanism, used for conveying pole pieces; A coating mechanism, used for coating the slurry onto the pole piece; The blowing mechanism and the coating mechanism are distributed in sequence along the conveying direction of the conveying mechanism. The blowing mechanism includes an ultrasonic generator and an air uniforming member. Along the conveying direction, an air uniforming member is provided on both sides of the ultrasonic generator. The ultrasonic generator is used to vibrate the gas in the air uniforming member to generate a vibrating airflow with the same frequency. Each of the air uniforming members is provided with an air outlet, and the air outlet is arranged toward the pole piece conveyed by the conveying mechanism and extends along the width direction of the pole piece.

2. The pole piece coating equipment according to claim 1, characterized in that: An air chamber is provided inside the wind uniforming member, the air chamber extends along the width direction of the pole piece and is connected to the air outlet, at least part of the ultrasonic generator is located in the air chamber, and the ultrasonic generator vibrates along the tape running direction.

3. The pole piece coating equipment according to claim 2, characterized in that: The air blowing mechanism further comprises an air inlet, which is arranged at the end of the wind uniforming member along the width direction of the pole piece and is communicated with the wind chamber.

4. The pole piece coating equipment according to claim 3, characterized in that: The wind chamber comprises a first sub-wind chamber and a second sub-wind chamber, the first sub-wind chamber and the second sub-wind chamber are spaced apart in the height direction, and a gap is provided between the first sub-wind chamber and the second sub-wind chamber; The first sub-air chamber is connected to the air inlet, the second sub-air chamber is connected to the air outlet and the ultrasonic generator, and the height direction, the width direction of the pole piece and the tape running direction are perpendicular to each other.

5. The pole piece coating equipment according to claim 4, characterized in that: There are multiple slits, and all of the slits are distributed at intervals along the width direction of the pole piece.

6. The pole piece coating equipment according to claim 4, characterized in that: The ultrasonic generator comprises a shell and a generator body. The generator body is arranged in the shell. The shell and the wind uniforming member together form the first sub-wind chamber.

7. The pole piece coating equipment according to claim 6, characterized in that: The shell is provided with the air inlet, and along the width direction of the pole piece, the air inlet is located at one end of the shell.

8. The pole piece coating equipment according to any one of claims 1 to 7, characterized in that: There are multiple ultrasonic generators and multiple wind uniformity members, all of which are arranged along the tape running direction, and one wind uniformity member is provided on both sides of each ultrasonic generator.

9. The pole piece coating equipment according to any one of claims 1 to 7, characterized in that: The ultrasonic generator and the wind uniforming member are detachably connected.

10. The pole piece coating equipment according to any one of claims 1 to 7, characterized in that: The straight-line distance between the air outlet and the pole piece is L, and the range of L is 1 mm to 3 mm.

11. A battery production system, characterized in that: It comprises the electrode coating equipment and drying equipment as described in any one of claims 1 to 10, wherein the coating mechanism, the blowing mechanism and the drying equipment are distributed in sequence along the belt walking direction.

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