Processing assembly for positive electrode material

Abstract

The invention discloses a processing assembly for a positive electrode material, and the processing assembly comprises a containing device, and the wall body of the containing device defines a processing cavity suitable for containing a to-be-processed material; the rotating shaft is rotatably arranged in the containing device, at least part of the rotating shaft is located in the machining cavity, a cutting piece and a stirring piece are arranged on the rotating shaft, and the rotating direction of the cutting piece is opposite to that of the stirring piece; the cooling device is arranged in the wall body and is suitable for cooling the accommodating device; and the drying device is arranged in the containing device and is suitable for heating the to-be-processed materials. The processing assembly for the positive electrode material designed according to the invention is particularly suitable for coating processes with different material characteristics, such as a washing sequence product or a sintering product in the preparation process of the positive electrode material, independently integrates a plurality of procedures, can effectively reduce cost and improve efficiency, and has a good processing effect.

Description

Technical Field

[0001] The invention relates to the field of industrial processing equipment, and in particular to a processing component for positive electrode materials. Background Art

[0002] Lithium-ion batteries are the most widely used secondary batteries in the market today, and the positive electrode material is one of the key factors that determine the performance of the battery. Taking the ternary positive electrode material as an example, its solid phase preparation process is usually to directly mechanically mix the precursor of the positive electrode material and the lithium source, and then obtain it through calcination. The positive electrode material is generally charged and discharged by the insertion and extraction of lithium ions. However, with the increase in the number of cycles, the particles of the positive electrode material are often prone to in-plane peeling and damage, which will cause the surface area of ​​the electrode to decrease, and ultimately lead to the attenuation of the battery capacity. Further heat treatment on the surface of the positive electrode material to form a coating layer can protect the positive electrode material, reduce the occurrence of these phenomena, and thus extend the service life of the battery. Therefore, the post-processing coating process is a crucial link in the entire production process of lithium battery positive electrode materials. A good coating process can directly increase the specific surface area of ​​the electrode, increase the contact area between the electrode material and the electrolyte, and improve the quality of the product.

[0003] In the related art, different material properties lead to different preparation processes and parameters. For example, due to differences in material properties caused by different systems (such as lithium cobalt oxide, lithium iron phosphate, and multi-element positive electrode materials) or different Ni contents in multi-element positive electrode materials, there will be a difference in whether water washing and drying steps are required between the previous sintering process and the coating process. Therefore, if the product to be coated is a water-washed sequence product, it needs to be dried before coating, that is, it needs to be processed in sequence by a variety of equipment such as drying equipment, cooling equipment, and coating equipment. These equipment occupy a large space and have high costs and energy consumption. If the sintered product does not need to be dried and is directly coated, although the existing coating equipment can be directly used for coating, there is still a problem of uneven coating due to poor dispersion of additives and easy agglomeration, which will reduce the performance of the positive electrode material. At present, there is no independent equipment that can uniformly coat positive electrode material process products (water-washed sequence products and sintered products) with different material properties. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to propose a processing assembly for positive electrode materials. The processing assembly for positive electrode materials designed according to the present invention is specifically suitable for coating processes with different material properties, such as water-washed sequence products or sintered products in the preparation process of positive electrode materials. It independently integrates multiple processes, can effectively reduce costs and increase efficiency, and has good processing effects.

[0005] The processing assembly for positive electrode materials according to the present invention comprises: a containing device, the wall of the containing device encloses a processing chamber suitable for containing the material to be processed; a rotating shaft, the rotating shaft is rotatably arranged in the containing device and at least a part of the rotating shaft is located in the processing chamber, a cutting piece and a stirring piece are arranged on the rotating shaft, and the cutting piece and the stirring piece rotate in opposite directions; a cooling device, the cooling device is arranged in the wall and is suitable for cooling the containing device; a drying device, the drying device is arranged in the containing device and is suitable for heating the material to be processed.

[0006] The processing assembly for positive electrode materials according to the present invention integrates a variety of devices for processing materials to be processed, and integrates drying, cooling and coating processes in one. It can not only dry and cool the water-washed sequence products before coating, but also directly coat the sintered products. It has high compatibility with process products of materials to be processed with different material properties, and is independently set up with high space utilization and low energy consumption. Through the processing assembly, the surface coating processing of materials to be processed with various material properties can be better realized. In addition, in the present application, the cutting parts and stirring parts arranged on the rotating shaft of the processing assembly rotate in opposite directions. During the processing, the materials to be processed can be fully broken up, stirred and mixed to avoid the agglomeration problem of additives such as coating agents, improve the activity of the additives, and make the coating agent evenly coated on the process products of the materials to be processed, thereby improving the processing effect.

[0007] According to some embodiments of the present invention, the rotating shaft includes: a shaft body, one end of which is rotatably disposed in the accommodating device, and the other end of the shaft body extends into the processing cavity; a sleeve, which is sleeved on the shaft body and located in the processing cavity, and the sleeve is suitable for rotating in the opposite direction relative to the shaft body; wherein the cutting piece is disposed on one of the shaft body and the sleeve, and the stirring piece is disposed on the other of the shaft body and the sleeve.

[0008] According to some embodiments of the present invention, the stirring member is constructed in multiple parts and includes at least a first stirring member and a second stirring member, the first stirring member and the second stirring member are respectively arranged at the two ends of the shaft body in the axial direction, the sleeve is arranged between the first stirring member and the second stirring member, and the cutting member is arranged on the sleeve.

[0009] According to some embodiments of the present invention, the cutting element is configured to be a plurality of cutting elements spaced apart in the axial direction.

[0010] According to some embodiments of the present invention, the processing component for positive electrode materials also includes: a driving member, which is connected to the shaft and is suitable for driving the shaft to rotate; a transmission member, which has a first transmission end and a second transmission end, the first transmission end cooperates with the shaft, and the second transmission end cooperates with the sleeve, and the transmission member is suitable for driving the sleeve to rotate in the opposite direction when the shaft rotates.

[0011] According to some embodiments of the present invention, a first tooth portion is provided on the shaft body, and a second tooth portion is provided on the sleeve, and the first tooth portion and the second tooth portion are spaced apart in the axial direction; a third tooth portion is provided on the transmission member, and the third tooth portion is suitable for respectively engaging with the first tooth portion and the second tooth portion, so as to be suitable for driving the second tooth portion to rotate in the opposite direction under the drive of the first tooth portion.

[0012] According to some embodiments of the present invention, the processing assembly for positive electrode materials further includes: a first driving member and a second driving member, wherein the first driving member and the second driving member are respectively connected to the shaft body and the sleeve and drive the shaft body and the sleeve to rotate in opposite directions.

[0013] According to some embodiments of the present invention, an angle between the first stirring member and the shaft body in the axial direction is α, an angle between the second stirring member and the shaft body in the axial direction is β, and the angle satisfies: α≠β.

[0014] According to some embodiments of the present invention, the rotational speed of the cutting element is V1, the rotational speed of the stirring element is V2, and V1≠V2.

[0015] According to some embodiments of the present invention, the wall body includes: an outer wall, the interior of which defines an installation space; an inner wall, which is arranged in the installation space and is spaced from the outer wall to define an installation gap, the cooling device and the drying device are arranged in the installation gap, and the interior of the inner wall defines the processing cavity.

[0016] According to some embodiments of the present invention, the drying device includes: an air intake structure, the air intake structure having an air outlet end, the air outlet end being connected to the processing chamber; and an air flow heater, the air flow heater being used to heat the air flow entering the processing chamber from the air outlet end.

[0017] In summary, the processing assembly for positive electrode materials according to the present invention integrates a variety of devices for processing positive electrode materials, is rich in functions, occupies little space, and because the cutting parts and stirring parts arranged on the rotating shaft rotate in opposite directions, the processing effect on the positive electrode materials is better.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1 Schematic diagram of the structure of a processing assembly according to a first embodiment of the present invention.

[0021] Figure 2 It is a schematic diagram of the structure of a machining component in the form of a shaft body and a sleeve according to a second embodiment of the present invention.

[0022] Figure 3 Schematic diagram of the structure of a cutting piece according to an embodiment of the present invention.

[0023] Figure 4 2 is a schematic diagram of the structure of a accommodating device according to the third embodiment of the present invention.

[0024] Figure 5 2 is a schematic diagram of the structure of a receiving device for an airflow heater according to a fourth embodiment of the present invention.

[0025] Reference numerals:

[0026] 1000. Processing components;

[0027] 1. Accommodation device; 11. Cylinder body; 12. Cover body; 10. Wall body; 101. Outer wall; 102. Inner wall; 10a. Processing chamber; 10b. Open mouth; 10c. Discharge port; 10d. Feed port; 10e. Dust collection port; 10f. Installation gap;

[0028] 2, rotating shaft; 21, cutting member; 221, first stirring member; 222, second stirring member; 201, shaft body; 202, shaft sleeve;

[0029] 3. Cooling device; 42. Air intake structure; 42a. Air outlet; 43. Air flow heater; 8. Dust collecting device. DETAILED DESCRIPTION

[0030] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0035] Lithium-ion batteries are the most widely used secondary batteries in the market today, and the positive electrode material is one of the key factors that determine the performance of the battery. Taking the ternary positive electrode material as an example, its solid phase preparation process is usually to directly mechanically mix the precursor of the positive electrode material and the lithium source, and then obtain it through calcination. The positive electrode material is generally charged and discharged by the insertion and extraction of lithium ions. However, with the increase in the number of cycles, the particles of the positive electrode material are often prone to in-plane peeling and damage, which will cause the surface area of ​​the electrode to decrease, and ultimately lead to the attenuation of the battery capacity. Further heat treatment on the surface of the positive electrode material to form a coating layer can protect the positive electrode material, reduce the occurrence of these phenomena, and thus extend the service life of the battery. Therefore, the post-processing coating process is a crucial link in the entire production process of lithium battery positive electrode materials. A good coating process can directly increase the specific surface area of ​​the electrode, increase the contact area between the electrode material and the electrolyte, and improve the quality of the product.

[0036] In the related art, different material properties lead to different preparation processes and parameters. For example, due to differences in material properties caused by different systems (such as lithium cobalt oxide, lithium iron phosphate, and multi-element positive electrode materials) or different Ni contents in multi-element positive electrode materials, there will be differences in whether water washing and drying steps are required between the previous sintering process and the coating process. Therefore, if the product to be coated is a water-washed sequence product, it needs to be dried before coating, that is, it needs to be processed in sequence by a variety of equipment such as drying equipment, cooling equipment, and coating equipment. These equipment occupy a large space and have high costs and energy consumption. If the sintered product does not need to be dried and is directly coated, although the existing coating equipment can be directly used for coating, there is still a problem of uneven coating due to poor dispersion of additives and easy agglomeration, which will reduce the performance of the positive electrode material. Currently, there is no independent equipment that can uniformly coat positive electrode material process products (water-washed sequence products and sintered products) with different material properties.

[0037] Reference below Figure 1-Figure 5 A processing assembly 1000 for cathode material according to an embodiment of the present invention is described.

[0038] like Figure 1-Figure 5 As shown, the processing assembly 1000 for positive electrode materials according to the present invention includes: a containing device 1, a rotating shaft 2, a cooling device 3 and a drying device. The wall 10 of the containing device 1 encloses a processing chamber 10a suitable for containing the material to be processed; the rotating shaft 2 is rotatably arranged in the containing device 1 and at least a part of the rotating shaft 2 is located in the processing chamber 10a, and a cutting piece 21 and a stirring piece are arranged on the rotating shaft 2, and the rotation direction of the cutting piece 21 is opposite to that of the stirring piece; the cooling device 3 is arranged in the wall 10 and is suitable for cooling the containing device 1; the drying device is arranged in the containing device 1 and is suitable for heating the material to be processed.

[0039] Specifically, the accommodating device 1 is suitable for accommodating the material to be processed, and the accommodating device 1 serves as the main part of the processing assembly 1000. At least part of the rotating shaft 2 is located in the processing chamber 10a of the accommodating device 1 to drive the cutting member 21 and the stirring member to rotate, thereby realizing the cutting and stirring of the material to be processed. The cooling device 3 can cool the accommodating device 1 to cool down the high-speed running equipment, and can also cool down the material to be processed. The drying device heats and dries the material to be processed to reduce the moisture in the material to be processed. Here, the material to be processed can refer to a mixture of positive electrode materials and additives (such as coating agents, etc.). The processing assembly 1000 at least integrates the functions of stirring, cutting, cooling and drying. Through the processing assembly 1000, the operations of cutting, stirring, drying and cooling the material to be processed can be realized. Compared with the processing of the material to be processed by multiple equipment in the prior art, the processing assembly 1000 is rich in functions, occupies less space, can match different process conditions and different series of materials to be processed, has good practicality, low equipment cost, can also reduce the waste of the material to be processed when transferring between multiple equipment, and has high processing efficiency.

[0040] Furthermore, the cutting member 21 and the stirring member arranged on the rotating shaft 2 rotate in opposite directions. When the cutting member 21 and the stirring member rotate, they can fully break up, stir and mix the materials to be processed to complete the primary processing of the materials to be processed and the additives. At the same time, the drying device works to heat the materials to be processed, which can improve the activity of the additives and ensure that all particle sizes, additive uniformity and overall coating uniformity in the processed products are good, thereby improving the processing effect.

[0041] According to the present invention, the processing component 1000 for positive electrode materials integrates a variety of devices for processing materials to be processed, and integrates drying, cooling and coating processes. It can not only dry and cool the water-washed sequence products before coating, but also directly coat the sintered products. It has high compatibility with process products of materials to be processed with different material properties, and is independently set up with high space utilization and low energy consumption. Through the processing component 1000, the surface coating processing of materials to be processed with various material properties can be better realized. In addition, in the present application, the cutting member 21 and the stirring member arranged on the rotating shaft 2 of the processing component 1000 rotate in opposite directions. During the processing, the materials to be processed can be fully broken up, stirred and mixed to avoid the agglomeration problem of additives such as coating agents, improve the activity of the additives, and make the coating agent evenly coated on the process products of the materials to be processed, thereby improving the processing effect.

[0042] Here, the cooling device 3 can cool the containing device 1 by circulating cooling water to cool the containing device 1 after drying by the drying device. It can reduce the mechanical heat of the equipment under high-speed operation and cool down the material to be processed, which is convenient for manual operation of subsequent processes.

[0043] In some embodiments, the cooling device 3 may be a cooling pipeline disposed in the wall 10 , and a cooling liquid is passed through the cooling pipeline to exchange heat with the wall 10 of the receiving device 1 .

[0044] Furthermore, the number of the cutting elements 21 and the stirring elements does not need to be limited. There can be multiple cutting elements 21 or stirring elements, and the rotation direction of at least one cutting element 21 and at least one stirring element is opposite.

[0045] The cutting member 21 and the stirring member can be spaced apart in the axial direction. When there are multiple cutting members 21 and multiple stirring members, a stirring member can be arranged between two axially adjacent cutting members 21, or a stirring member located at the end of multiple stirring members can be arranged adjacent to a cutting member 21 located at the end of multiple cutting members 21.

[0046] The cutting member 21 is provided with a cutting blade, and the stirring member is provided with a stirring paddle. The cutting blade is thinner and sharper than the stirring paddle, and has a stronger cutting force, so as to cut the material to be processed. The stirring paddle is wider, thicker and blunter than the cutting blade, so as to stir the material to be processed.

[0047] like Figure 1-Figure 2 As shown, the number, location, arrangement, orientation, rotation speed and rotation direction of the cutting elements 21 and the stirring elements can be designed according to actual needs and are not limited here.

[0048] Furthermore, the cutting element 21 and the stirring element can be rotated in opposite directions by designing the structure of the rotating shaft 2. In some embodiments, this can be achieved by designing the rotating shaft 2 as a shaft body 201 with a sleeve 202 disposed outside the shaft body 201. At this time, the shaft body 201 and the sleeve 202 can be driven by different driving structures, and the cutting element 21 and the stirring element are respectively arranged on the shaft body 201 and the sleeve 202, thereby achieving coaxial rotation in different directions; in other embodiments, when the rotating shaft 2 rotates, one of the cutting element 21 and the stirring element rotates in the same direction as the rotating shaft 2, and the other rotates in the opposite direction to the rotating shaft 2.

[0049] According to some embodiments of the present invention, Figure 2As shown, the rotating shaft 2 includes a shaft body 201 and a sleeve 202, one end of the shaft body 201 is rotatably arranged in the accommodating device 1, and the other end of the shaft body 201 extends into the processing cavity 10a; the sleeve 202 is sleeved on the shaft body 201 and is located in the processing cavity 10a, and the sleeve 202 is suitable for rotating in the opposite direction relative to the shaft body 201; wherein a cutting piece 21 is arranged on one of the shaft body 201 and the sleeve 202, and a stirring piece is arranged on the other of the shaft body 201 and the sleeve 202. Here, the rotating shaft 2 is designed as a structure in which the sleeve 202 is arranged outside the shaft body 201, and the shaft body 201 and the sleeve 202 can rotate in opposite directions. The cutting piece 21 and the stirring piece are respectively arranged on the shaft body 201 and the sleeve 202, so as to realize coaxial and unidirectional rotation.

[0050] In some embodiments, the accommodating device 1 has a cylinder body 11 and a cover body 12, the shaft body 201 can be connected to the cylinder body 11 or the cover body 12, and the sleeve 202 can also be connected to the cylinder body 11 or the cover body 12. Of course, the shaft body 201 and the sleeve 202 can also be connected to other structures outside the accommodating device 1, and the shaft body 201 and the sleeve 202 can rotate relative to each other. Further, the sleeve 202 can be connected to the bottom wall of the cylinder body 11, the shaft body 201 is connected to the cover body 12, and the shaft body 201 and the sleeve 202 can rotate relative to each other.

[0051] According to some embodiments of the present invention, the stirring member is configured as a plurality of stirring members and includes at least a first stirring member 221 and a second stirring member 222. The first stirring member 221 and the second stirring member 222 are respectively disposed at two ends of the shaft body 201 in the axial direction, the sleeve 202 is disposed between the first stirring member 221 and the second stirring member 222, and the cutting member 21 is disposed on the sleeve 202. Here, the first stirring member 221 and the second stirring member 222 are respectively disposed at two ends of the shaft body 201 in the axial direction, so as to drive the material to be processed to move toward the middle of the shaft body 201 in the axial direction of the shaft body 201, so as to facilitate the cutting operation of the cutting member 21. At the same time, since the directions of the stirring member and the cutting member 21 are opposite, the forces acting on the material to be processed are also opposite, so that the coating agent is evenly coated on the process product of the material to be processed, thereby improving the processing effect.

[0052] According to some embodiments of the present invention, the cutting piece 21 is configured as a plurality of cutting pieces 21 spaced apart in the axial direction. In some embodiments, the cutting piece 21 has a plurality of cutting pieces 21 stacked in the axial direction, and adjacent cutting pieces 21 are fixed by a shaft key. The plurality of cutting pieces 21 arranged in the axial direction of the shaft body 201 can fully and evenly cut the material to be processed, so as to realize the processing operation of the cladding material to be processed.

[0053] Here, when the shaft body 201 rotates, one of the cutting element 21 and the stirring element is disposed on the shaft body 201 and rotates in the same direction as the shaft body 201 , and the other is disposed on the sleeve 202 and rotates in the opposite direction to the shaft body 201 .

[0054] According to some embodiments of the present invention, the processing assembly 1000 for positive electrode materials further includes a driving member and a transmission member, wherein the driving member is connected to the shaft body 201 and is suitable for driving the shaft body 201 to rotate; the transmission member has a first transmission end and a second transmission end, wherein the first transmission end cooperates with the shaft body 201, and the second transmission end cooperates with the sleeve 202, and the transmission member is suitable for driving the sleeve 202 to rotate in the opposite direction when the shaft body 201 rotates. Specifically, the driving member drives the shaft body 201 to rotate, so as to drive one of the cutting member 21 and the stirring member to rotate with the shaft body 201, and when the shaft body 201 rotates, the transmission member can be driven to rotate by the shaft body 201, thereby driving the sleeve 202 to rotate in the opposite direction, thereby driving one of the cutting member 21 and the stirring member to rotate in the opposite direction with the sleeve 202, and by setting the driving member and the transmission member, the design of the opposite direction rotation of the cutting member 21 and the stirring member can be realized.

[0055] According to some embodiments of the present invention, a first tooth portion is provided on the shaft body 201, a second tooth portion is provided on the sleeve 202, and the first tooth portion and the second tooth portion are spaced apart in the axial direction; a third tooth portion is provided on the transmission member, and the third tooth portion is suitable for meshing with the first tooth portion and the second tooth portion, respectively, so as to be suitable for driving the second tooth portion to rotate in the opposite direction under the drive of the first tooth portion. Specifically, the transmission member can be fixedly provided on the accommodating device 1, and the third tooth portion provided on the transmission member can move relative to the transmission member to mesh with the first tooth portion and the second tooth portion, the portion where the third tooth portion meshes with the first tooth portion is the above-mentioned first transmission end, and the portion where the third tooth portion meshes with the second tooth portion is the above-mentioned second transmission end, and the first tooth portion and the second tooth portion are spaced apart in the axial direction, so that the third tooth portion can drive the second tooth portion to rotate in the opposite direction under the drive of the first tooth portion, thereby driving the sleeve 202 to rotate in the opposite direction, and realizing the design of the opposite rotation of the cutting member 21 and the stirring member.

[0056] Here, the shaft body 201 and the shaft sleeve 202 may be designed to be driven by different driving structures, and the cutting element 21 and the stirring element are respectively arranged on the shaft body 201 and the shaft sleeve 202, so as to achieve coaxial but unidirectional rotation.

[0057] According to some embodiments of the present invention, Figure 2 As shown, the processing assembly 1000 for positive electrode materials further includes a first driving member and a second driving member, which are respectively connected to the shaft body 201 and the sleeve 202 and drive the shaft body 201 and the sleeve 202 to rotate in opposite directions. Specifically, the first driving member is suitable for driving the shaft body 201 to rotate, and the second driving member is suitable for driving the sleeve 202 to rotate. The direction in which the first driving member drives the shaft body 201 to rotate is opposite to the direction in which the second driving member drives the sleeve 202 to rotate, so that the shaft body 201 and the sleeve 202 can rotate relative to each other.

[0058] In some embodiments, the first driving member and the second driving member may have the same or different structures and are suitable for driving the shaft body 201 and the sleeve 202 to rotate at the same or different speeds.

[0059] Furthermore, the first driving member can adopt a variable frequency motor belt drive to drive the shaft body 201 to rotate, and the second driving member can adopt a reduction motor gear drive to drive the sleeve 202 to rotate in the direction opposite to the rotation direction of the shaft body 201. The two sets of structures of the first driving member and the second driving member are very stable under long-term use and are almost maintenance-free.

[0060] The design of the counter-rotation of the stirring element and the cutting element 21 is not limited to the form described in the above embodiment, and can also be other ways that can make the cutting element 21 and the stirring element rotate in opposite directions, which can be designed according to actual needs.

[0061] In some embodiments, the angles between the stirring element and the cutting element 21 and the rotating shaft 2 in the axial direction may be the same or different, and the directions of the stirring element and the cutting element 21 may also be the same or different.

[0062] According to some embodiments of the present invention, Figure 1 As shown, the angle between the first stirring member 221 and the shaft body 201 in the axial direction is α, and the angle between the second stirring member 222 and the shaft body 201 in the axial direction is β, and they satisfy: α≠β. Specifically, the stirring of the first stirring member 221 and the second stirring member 222 has a certain angle compared to the axial direction of the shaft body 201, so as to tumble and mix the materials to be processed, so that the materials to be processed are mixed evenly, and the coating effect is improved. In addition, there is a difference between the angle α between the first stirring member 221 and the shaft body 201 in the axial direction and the angle β between the second stirring member 222 and the shaft body 201 in the axial direction, so as to fully take into account the materials to be processed at different positions, so as to further evenly mix the materials to be processed. Here, α or β can also be 0.

[0063] According to some embodiments of the present invention, the rotation speed of the cutting member 21 is V1, and the rotation speed of the stirring member is V2, and V1≠V2 is satisfied. Specifically, the stirring member and the cutting member 21 can be driven by different driving mechanisms so that the stirring and cutting operations can be independent of each other, and the parameters can be adjusted separately so that the stirring member and the cutting member 21 rotate in opposite directions at different speeds to improve the precision of the processing assembly 1000 for the positive electrode material. The rotation speed of the cutting member 21 and the rotation speed of the stirring member can be controlled at 0-3000rpm according to similar equipment in the industry.

[0064] Furthermore, the rotation speed V1 of the cutting member 21 is greater than the rotation speed V2 of the stirring member, that is, V1>V2, and the cutting speed is greater than the stirring speed, so as to improve the processing effect of the material to be processed. In some embodiments, V1 can be 2500rpm, V2 can be 400rpm, or V1 can be 3000rpm, and V2 can be 500rpm.

[0065] Furthermore, it satisfies: 0<V1 / V2≤5, and the ratio of the rotation speed V1 of the cutting member 21 to the rotation speed V2 of the stirring member is in the range of 0 to 5, so as to better tumble and mix the materials to be processed, make the materials to be processed more evenly mixed, and further improve the coating effect.

[0066] In some embodiments, the inner wall of the processing chamber 10a is also provided with blades. When the rotating shaft drives the material to be processed to rotate, the blades can contact the material to be processed and fully break up, stir and mix the material to be processed, thereby improving the processing effect of the material to be processed.

[0067] In some embodiments, Figure 4 As shown, the accommodating device 1 includes a cylinder body 11 and a cover body 12. The cylinder body 11 has a wall body 10. The cylinder body 11 is formed with an open port 10b and a discharge port 10c connected to the processing chamber 10a; the cover body 12 is arranged at the open port 10b, and the cover body 12 is provided with a feed port 10d connected to the processing chamber 10a. Specifically, the design of the feed port 10d of the containing device 1 is mainly divided into two parts, and the two parts are independent of each other. One part is the inlet of the upstream equipment material. This part of the material accounts for a large proportion and is the main output product, that is, the main feed port. It adopts the form of mechanical connection with the stainless steel pipe of the upstream equipment discharge port. After the upstream discharge, the material passes through the feeding screw and is transported to the equipment cylinder 11 through the stainless steel pipe. The lining of the stainless steel pipe can isolate the contact with the inner wall of the metal pipe, reduce the risk of introducing metal foreign matter, which is equivalent to forming a closed system after connecting with the upstream equipment; the other part is the inlet of auxiliary materials such as additives, that is, the auxiliary feed port. Because in the coating process, different series of products involve different ratios, and the requirements for auxiliary materials such as additives are also very different. Therefore, the entrance of additives and auxiliary materials is designed separately from the entrance of the upstream equipment material. The part of the cover body 12 designed with the auxiliary feed port is protruding. In the process where no auxiliary material is added, it is in a blind state to avoid the introduction of foreign matter. When adding auxiliary materials, the cover of the auxiliary feed port is opened to add auxiliary materials. The discharge port 10c is composed of a rotating cylinder, a plug, a cover, and a transparent observation window. The plug is integrated with the cylinder body 11 to ensure sealing. The cover of the discharge port 10c is openable for easy cleaning. The discharge port 10c is provided with a safety switch interlocked with the control system. If the cover of the discharge port 10c is accidentally opened during operation, the system will automatically shut down and generate an alarm.

[0068] In some embodiments, a groove is designed on the end surface of the cylinder body 11 facing the cover body 12 to accommodate the cover body 12, and a rubber pad is provided in the groove to seal the gap between the cylinder body 11 and the cover body 12 to avoid air leakage and powder leakage.

[0069] In some embodiments, Figure 4 As shown, the cover 12 is provided with a dust collecting port 10e connected to the processing chamber 10a; the processing assembly 1000 for positive electrode materials also includes a dust collecting device 8, which is arranged at the dust collecting port 10e to collect dust in the processing chamber 10a. Specifically, the material of the window is high borosilicate glass, which is resistant to high temperatures, not easy to break, has good transparency, and is not easy to oxidize. The position of the window is set on the cover 12, occupying about two-fifths of the area of ​​the cover 12, and the shape is fan-shaped, which does not appear abrupt on the circular cover 12. The window scraper is fixed at the center of the cover 12, made of high borosilicate glass, close to the inside of the cover 12, and an external rotating handle can be rotated 360°. Because the material has certain adhesion and static electricity, the material may be lined on the cover 12, affecting the state of the material inside the observation equipment. Therefore, the material is scraped off in the form of a scraper for easy observation.

[0070] The design of dust collection is related to environmental safety and material handling. A dust collection port 10e is designed at the cover 12 of the equipment to connect to the dust collection on the top of the silo. It adopts the form of a sintered plate, which has better effect and longer service life than filter bags. The dust collection on the top of the silo is returned in the form of pulses, which plays a certain role in self-cleaning and preventing excessive accumulation of materials. The pulse time is set in advance, and different cycle periods are set according to different material characteristics. Self-cleaning is performed regularly. Under normal circumstances, it is in a state of slight positive pressure. According to the pressure difference at both ends, when the pressure difference at both ends reaches the set value, an alarm will occur. At this time, manual intervention is required to start self-cleaning to avoid blockage and equipment failure.

[0071] According to some embodiments of the present invention, Figure 4 As shown, the wall body 10 includes an outer wall 101 and an inner wall 102. The outer wall 101 defines an installation space; the inner wall 102 is arranged in the installation space and is spaced from the outer wall 101 to define an installation gap 10f. The cooling device 3 and the drying device are arranged in the installation gap 10f. The inner wall 102 defines a processing chamber 10a. Specifically, the wall body 10 of the cylinder body 11 is designed to be double-layered. The outer wall 101 located in the outer layer can block the heat source to facilitate the operation of the operator, and the inner wall 102 located in the inner layer can be used to accommodate the material to be processed. The installation gap 10f between the inner wall 102 and the outer wall 101 can be equipped with the cooling device 3 and the drying device.

[0072] In some embodiments, the cooling device 3 is a cooling pipeline in the installation gap 10f, in which a cooling medium flows. The installation gap 10f is reserved with a water inlet and outlet for the cooling medium to be equipped with a cooling circulating water system, so that the temperature can be quickly lowered after heating.

[0073] In some embodiments, the cylinder body 11 is provided with material temperature and circulating water temperature sensors which are linked to the PLC to realize over-temperature alarm.

[0074] In some embodiments, the processing assembly 1000 includes a cylinder body 11 that integrates stirring function and heating and cooling function, and a cover body 12 for opening and closing the cylinder body 11, wherein the cover body 12 is composed of a cover body 12 sealed with the cylinder body 11, a window opened on the cover body 12, a window scraper installed on the window, and a dust collecting port 10e opened on the cover body 12, a dust collecting device 8 is installed in the dust collecting port 10e, and an equipment material inlet is also opened on the top of the cover body 12, and the equipment material inlet includes an independently opened main feed port and an auxiliary feed port, and the auxiliary feed port is convexly arranged on the cover body 12. A discharge port 10c is provided on the cylinder body 11, and an integrally formed and openable and closable plug is arranged on the discharge port 10c. A cover shell that can be opened and closed is provided on the outside of the plug. The plug opens and closes the discharge port 10c by rotating the cylinder. The cover shell is linked with the PLC and the alarm system. A cutting mechanism and a stirring mechanism are provided inside the cylinder body 11, and the two are driven to operate through a transmission mechanism linked with the PLC. The dust collecting device 8 is also linked with the PLC, and backblowing cleaning is performed according to the pressure difference.

[0075] Here, the drying device can heat and dry the material to be processed by steam heating or electric heating.

[0076] According to some embodiments of the present invention, Figure 4 As shown, the drying device includes an electric heater, which is arranged in the installation gap 10f and is suitable for heating the material to be processed in the processing chamber 10a. Specifically, the electric heater is a structure that generates heat after being powered on. The electric heater is designed in the installation gap 10f to avoid occupying the space in the processing chamber 10a, and at the same time can improve the temperature uniformity when the electric heater heats the material to be processed. In some embodiments, the electric heater is configured as an electric heating plate.

[0077] According to some embodiments of the present invention, Figure 5As shown, the drying device includes an air intake structure 42 and an air flow heater 43. The air intake structure 42 has an air outlet end 42a, and the air outlet end 42a is connected to the processing chamber 10a; the air flow heater 43 is used to heat the airflow entering the processing chamber 10a from the air outlet end. Specifically, the drying device adopts steam heating, and the air intake structure 42 can be set on the containing device 1. The air flow heater 43 heats the airflow entering the processing chamber 10a from the air intake structure 42 to achieve heating treatment of the material to be processed. Before the airflow enters the processing chamber 10a, the airflow heater 43 can heat the airflow to a set temperature in a short time. When the airflow is injected into the processing chamber 10a, the high-pressure airflow can lift the material to be processed after the primary coating, and can also play a certain turbulent role while achieving the drying treatment of the material to be processed, further making the material to be processed more fully reach a completely random mixing state, improving the uniformity of the coating, and thus completing the coating process.

[0078] In some embodiments, the air intake structure 42 is an air intake pipeline, which generally introduces airflow from the bottom of the cylinder body, and the air outlet end 42a of the air intake pipeline is connected to the processing chamber 10a. The air intake pipeline can introduce high-pressure airflow into the processing chamber 10a.

[0079] When using the processing assembly for positive electrode materials designed according to the present invention, the following method can be referred to:

[0080] S1, starting the drying device to heat the processing chamber to a first preset temperature;

[0081] S2, start the rotating shaft, so that the cutting element rotates at a speed V1, and the stirring element rotates in the opposite direction at a speed V2;

[0082] S3, closing the drying device and starting the cooling device to cool the processing chamber to a second preset temperature.

[0083] Here, the control method applied to the above-mentioned processing assembly for positive electrode materials can be used in the coating process of positive electrode materials and precursors. The substrate to be dried (for example, a high-nickel positive electrode material after water washing, which needs to reduce the residual alkali through a water washing process and then be coated after drying) can be first added to the containing device, wherein the amount of the substrate added accounts for no more than 60% of the volume of the processing chamber. Then the heating function of the drying device is started, and high-temperature gas is introduced through the compressed air inlet. The high-temperature gas can be air, and the pressure of the high-temperature gas is controlled within the range of 0.09Mpa. The high-temperature gas is achieved by a tubular airflow heater arranged in the compressed air inlet. The temperature is in the range of ≤250°C. Of course, the heating tube in the cylinder interlayer can also be opened synchronously to heat the material in the reactor to 250°C or within the program setting range at a heating rate of 2-3°C / min, and the drying process is completed after 3-5h. When the drying process is completed, the rotating shaft is started to make the cutting piece and the stirring piece rotate coaxially but in opposite directions. The speed V1 of the cutting piece is in the range of 0-1000rpm, the speed V2 of the stirring piece is in the range of 0-200rpm, and the ratio of V1 to V2 is 5:1. When the material proportion and the speed are in this range, the best uniform coating effect can be achieved. After the coating process is completed, the drying device is closed by PLC control, and the cooling device is started. Coolant is continuously injected into the cooling pipe in the cylinder interlayer until the cylinder is at room temperature. The material is unloaded by controlling the discharge port through PLC, thereby completing the coating process and obtaining qualified products.

[0084] This method is suitable for the coating process of water-washed sequence products, that is, the drying, cooling and coating processes can be carried out independently in the same containing device without the need for material transfer, which greatly improves production efficiency and also reduces production energy consumption.

[0085] In summary, the processing assembly for positive electrode materials according to the present invention integrates a variety of devices for processing positive electrode materials, is rich in functions, occupies little space, and because the cutting parts and stirring parts arranged on the rotating shaft rotate in opposite directions, the processing effect on the positive electrode materials is better.

[0086] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0087] While embodiments of the present invention have been shown and described above, changes, modifications, substitutions and variations may be made to the embodiments described above.

Claims

1. A processing assembly (1000) for positive electrode materials, characterized in that: include: A containing device (1), wherein a wall (10) of the containing device (1) encloses a processing chamber (10a) suitable for containing materials to be processed; a rotating shaft (2), the rotating shaft (2) being rotatably disposed on the accommodating device (1) and at least a portion of the rotating shaft (2) being located in the processing chamber (10a), the rotating shaft (2) being provided with a cutting member (21) and a stirring member, the cutting member (21) and the stirring member rotating in opposite directions; A cooling device (3), the cooling device (3) being arranged in the wall (10) and being suitable for cooling the containing device (1); A drying device, which is arranged on the containing device (1) and is suitable for heating the material to be processed.

2. The processing assembly (1000) for positive electrode materials according to claim 1, characterized in that: The rotating shaft (2) comprises: A shaft body (201), one end of the shaft body (201) being rotatably disposed on the accommodating device (1), and the other end of the shaft body (201) extending into the processing chamber (10a); A shaft sleeve (202), the shaft sleeve (202) is sleeved on the shaft body (201) and is located in the processing cavity (10a), and the shaft sleeve (202) is suitable for rotating in the opposite direction relative to the shaft body (201); wherein The cutting element (21) is arranged on one of the shaft body (201) and the shaft sleeve (202), and the stirring element is arranged on the other of the shaft body (201) and the shaft sleeve (202).

3. The processing assembly (1000) for positive electrode materials according to claim 2, characterized in that: The stirring member is constructed in multiple pieces and includes at least a first stirring member (221) and a second stirring member (222); the first stirring member (221) and the second stirring member (222) are respectively arranged at two ends of the shaft body (201) in the axial direction; the shaft sleeve (202) is arranged between the first stirring member (221) and the second stirring member (222); and the cutting member (21) is arranged on the shaft sleeve (202).

4. The processing assembly (1000) for positive electrode materials according to claim 3, characterized in that: The cutting piece (21) is configured as a plurality of cutting pieces arranged at intervals in the axial direction.

5. The processing assembly (1000) for positive electrode materials according to claim 2, characterized in that: Also includes: a driving member, the driving member being connected to the shaft body (201) and being suitable for driving the shaft body (201) to rotate; A transmission member, the transmission member having a first transmission end and a second transmission end, the first transmission end cooperates with the shaft body (201), and the second transmission end cooperates with the shaft sleeve (202), and the transmission member is suitable for driving the shaft sleeve (202) to rotate in the opposite direction when the shaft body (201) rotates.

6. The processing assembly (1000) for positive electrode materials according to claim 5, characterized in that: The shaft body (201) is provided with a first tooth portion, and the shaft sleeve (202) is provided with a second tooth portion, and the first tooth portion and the second tooth portion are spaced apart in the axial direction; The transmission member is provided with a third tooth portion, and the third tooth portion is suitable for meshing with the first tooth portion and the second tooth portion respectively, so as to drive the second tooth portion to rotate in the opposite direction under the drive of the first tooth portion.

7. The processing assembly (1000) for positive electrode materials according to claim 2, characterized in that: Also includes: A first driving member and a second driving member, wherein the first driving member and the second driving member are respectively connected to the shaft body (201) and the shaft sleeve (202) and drive the shaft body (201) and the shaft sleeve (202) to rotate in opposite directions.

8. The processing assembly (1000) for positive electrode materials according to claim 3, characterized in that: The angle between the first stirring member (221) and the shaft body (201) in the axial direction is α, and the angle between the second stirring member (222) and the shaft body (201) in the axial direction is β, and the following condition is satisfied: α≠β.

9. The processing assembly (1000) for positive electrode materials according to claim 1, characterized in that: The rotation speed of the cutting element (21) is V1, the rotation speed of the stirring element is V2, and the condition V1≠V2 is satisfied.

10. The processing assembly (1000) for positive electrode materials according to claim 1, characterized in that: The wall body (10) comprises: An outer wall (101), wherein an installation space is defined inside the outer wall (101); An inner wall (102), wherein the inner wall (102) is arranged in the installation space and is spaced apart from the outer wall (101) to define an installation gap (10f), the cooling device (3) and the drying device are arranged in the installation gap (10f), and the processing chamber (10a) is defined inside the inner wall (102).

11. The processing assembly (1000) for positive electrode materials according to claim 1, characterized in that: The drying device comprises: An air intake structure (42), the air intake structure (42) having an air outlet end, the air outlet end being in communication with the processing chamber (10a); An airflow heater (43), wherein the airflow heater (43) is used to heat the airflow entering the processing chamber (10a) from the air outlet.

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