Apparatus for disintegrating and crushing secondary battery material

Abstract

An apparatus for disintegrating and crushing a secondary battery material according to an embodiment includes: a housing including a raw material inlet and a raw material outlet; a first disk and a second disk rotatably arranged to face each other in the housing and having a disintegration space formed therebetween; and a separator coupled to a rotation shaft of at least one of the first disk and the second disk and distributing a raw material introduced into the disintegration space to the outside of the first disk and the second disk. The first disk includes multiple first tracks formed at predetermined intervals in a radial direction and multiple first pinholes arranged in a circumferential direction between the multiple first tracks. The second disk includes multiple second tracks formed at predetermined intervals in a radial direction and alternately arranged with the multiple first tracks, and multiple second pinholes arranged in a circumferential direction between the multiple second tracks. The apparatus further includes multiple first pins fitted into the multiple first pinholes and multiple second pins fitted into the multiple second pinholes.

Description

Crushing device for secondary battery materials

[0001] The present disclosure relates to a shredding device for secondary battery materials.

[0002] The four major components of a secondary battery are often referred to as the cathode, anode, electrolyte, and separator. Among these, the cathode, anode, and separator are considered core materials, as they determine the overall performance of the secondary battery.

[0003] Secondary batteries, most notably lithium-ion batteries, typically generate electricity through the chemical reaction of lithium ions moving between the positive and negative electrodes. The positive electrode determines the battery's overall capacity and voltage, while the negative electrode stores and releases lithium ions released from the positive electrode.

[0004] Looking at the manufacturing process of cathode materials, it consists of a pretreatment process in which the raw materials precursor, lithium, and additives are quantified and mixed uniformly, a first firing process in which the mixture is fired and synthesized through oxidation, a posttreatment process in which the fired mixture is crushed, screened, and de-ironized, and a second firing process in which the mixture is fired for surface coating.

[0005] Meanwhile, in the case of cathode materials, natural graphite and artificial graphite have been successfully commercialized and are currently being mainly applied. Natural graphite cathode materials can stably store lithium ions due to the development of an internal layered structure, so they have excellent energy storage capacity and price competitiveness, and artificial graphite cathode materials have the advantage of high material structure stability and are advantageous for fast charging.

[0006] Looking at the manufacturing process of natural graphite anode materials, it consists of a flotation process that crushes the raw ore mined from the mine and removes impurities using the hydrophobicity of graphite, a process that mixes and assembles pitch to make it into spheroids, a spheroidization process that makes spheroids into uniform particle sizes using a crusher, a refining process that increases the carbon content by removing impurities, and a coating process that forms a carbon coating layer on the surface.

[0007] Looking at the manufacturing process of artificial graphite anode material, it consists of a grinding process in which the raw material needle coke is ground into fine particles and then shaped, an assembly process in which pitch is mixed to improve orientation and secondary particles are formed, a graphitization process in which heat treatment is performed at a high temperature of 3,000℃ or higher, a surface treatment process in which pitch is coated on the surface and calcined, and a crushing, de-ironization, and packaging process.

[0008] In this way, in manufacturing the positive and negative electrode materials, which are secondary battery materials, a process of crushing or disintegrating is performed to obtain the desired particle size. In the case of the crushing or disintegrating device generally used, the crushing or disintegrating is performed by a method in which a millstone-type disk rotates and crushes the material through friction.

[0009] This approach poses the problem of inability to adjust the disc's zero point and maintain disc spacing, making it impossible to achieve desired particle size control and reducing tap density. Furthermore, the use of ceramic discs can lead to discs undergoing thermal expansion and breaking during continuous production, reducing productivity.

[0010] One aspect of the disclosed embodiment is to provide a crushing device for obtaining a material having a desired particle size and tap density during a manufacturing process of a secondary battery material.

[0011] However, the problems to be solved by the embodiments of the present invention are not limited to the problems described above and can be expanded in various ways within the scope of the technical ideas included in the present invention.

[0012] According to one embodiment, a secondary battery material shredding device includes a housing including a raw material inlet and an outlet, a first disk and a second disk rotatably disposed facing each other in the housing and having a shredding space formed therebetween, and a separator coupled to a rotational axis of at least one of the first disk and the second disk and distributing raw materials fed into the shredding space to the outside of the first disk and the second disk, wherein the first disk includes a plurality of first tracks formed at predetermined intervals in a radial direction and a plurality of first pinholes arranged in a circumferential direction between the plurality of first tracks, and the second disk includes a plurality of second tracks formed at predetermined intervals in a radial direction and alternately arranged with the plurality of first tracks, and a plurality of second pinholes arranged in a circumferential direction between the plurality of second tracks, and further includes a plurality of first pins coupled to the plurality of first pinholes and a plurality of second pins coupled to the plurality of second pinholes.

[0013] The plurality of first pins may be arranged to face the plurality of second tracks, and the plurality of second pins may be arranged to face the plurality of first tracks.

[0014] The above separator may include at least one blade.

[0015] The above plurality of first tracks and the above plurality of second tracks can be formed by being inserted.

[0016] The plurality of first tracks may be arranged at a predetermined distance in the radial direction from the center of the first disk, and the plurality of second tracks may be arranged at a predetermined distance in the radial direction from the center of the second disk.

[0017] The spacing between the plurality of first pins and the plurality of second pins arranged adjacently in the radial direction may be 0.5 mm or more and 1.0 mm or less.

[0018] The diameter of the plurality of first pins and the plurality of second pins may be 10 mm or more and 12 mm or less.

[0019] The plurality of first pins may be detachably arranged in the plurality of first pinholes, and the plurality of second pins may be detachably arranged in the plurality of second pinholes.

[0020] The plurality of first pins may be coupled to the plurality of first pin holes by screw coupling, and the plurality of second pins may be coupled to the plurality of second pin holes by screw coupling.

[0021] The above plurality of first pins and the above plurality of second pins may have a circular or polygonal cross-section.

[0022] The first disk and the second disk may be made of stainless steel (SUS).

[0023] The spacing between the plurality of first pins and the plurality of second pins arranged radially adjacent to each other can be adjusted by the diameter or coupling clearance of at least one of the plurality of first pins and the plurality of second pins.

[0024] The rotation speed of the first disk and the second disk may be 2900 rpm or more and 3600 rpm or less.

[0025] The spacing between the plurality of first pins may be 1.4 mm or more and 3.4 mm or less, and the spacing between the plurality of second pins may be 1.4 mm or more and 3.4 mm or less.

[0026] The ratio (a / b) of the diameter (a) of the circumscribed circle that contacts the innermost pins among the plurality of first pins and the plurality of second pins and the diameter (b) of the inscribed circle that contacts the outermost pins may be 0.4 to 0.5.

[0027] According to a shredding device for secondary battery materials according to one embodiment, a material having a desired particle size and tap density can be obtained during a manufacturing process of secondary battery materials, and a continuous production system can be secured without the occurrence of a rotating disk breakage, thereby increasing production volume.

[0028] However, it is clear that the effects of the embodiments are not limited to the effects described above, and can be expanded in various ways without departing from the spirit and scope of the present invention.

[0029] Figure 1 is a cross-sectional view of a shredding device for secondary battery materials according to one embodiment.

[0030] Figure 2 is a cross-sectional view of an upper disk of a secondary battery material disintegration device according to one embodiment.

[0031] Figure 3 is a bottom view of an upper disk of a secondary battery material disintegration device according to one embodiment.

[0032] Figure 4 is a cross-sectional view of a lower disk in a secondary battery material disintegration device according to one embodiment.

[0033] Figure 5 is a bottom view of a lower disk in a secondary battery material disintegration device according to one embodiment.

[0034] Fig. 6 is a perspective view showing a lower disk and a separator among the shredding devices for secondary battery materials according to one embodiment.

[0035] Fig. 7 is a cross-sectional view of a secondary battery material disintegration device according to one embodiment, in which the upper disk and the lower disk are combined.

[0036] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily practice the present invention. In the drawings, parts irrelevant to the description have been omitted to clearly explain the present invention, and the same reference numerals have been used throughout the specification to refer to the same or similar components. In addition, some components in the attached drawings are exaggerated, omitted, or schematically depicted, and the size of each component does not entirely reflect the actual size.

[0037] The attached drawings are only intended to facilitate understanding of the embodiments disclosed in this specification, and the technical ideas disclosed in this specification are not limited by the attached drawings, and should be understood to include all modifications, equivalents, or substitutes included in the spirit and technical scope of the present invention.

[0038] Terms that include ordinal numbers, such as first, second, etc., may be used to describe various components, but the components are not limited by these terms. These terms are used solely to distinguish one component from another.

[0039] Furthermore, when we say that a layer, membrane, region, plate, or other part is "above" or "on" another part, this includes not only cases where it is "directly above" the other part, but also cases where there are other parts in between. Conversely, when we say that a part is "directly above" another part, we mean that there are no other parts in between. Furthermore, saying that a part is "above" or "on" a reference part means that it is located above or below the reference part, and does not necessarily mean that it is located "above" or "on" the opposite direction of gravity.

[0040] Throughout the specification, terms such as "comprises" or "has" should be understood to indicate the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but not to exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof. Therefore, when a part is said to "comprise" a certain component, this does not mean that other components are excluded, but rather that other components may be included, unless specifically stated otherwise.

[0041] Additionally, throughout the specification, when we say "in plan", we mean when the target portion is viewed from above, and when we say "in cross section", we mean when the target portion is viewed from the side in a cross-section cut vertically.

[0042] Throughout the specification, when a part is said to be "coupled" to another part, this includes not only "directly or physically coupled" but also "indirectly or non-contact coupled" with another element in between.

[0043] Additionally, throughout the specification, when we say "connected," this does not only mean that two or more components are directly connected, but also that two or more components are indirectly connected through other components, that they are electrically connected as well as physically connected, or that they are referred to by different names depending on location or function but are one.

[0044] FIG. 1 is a cross-sectional view of a secondary battery material disintegrator according to one embodiment, FIG. 2 is a cross-sectional view of an upper disk in the secondary battery material disintegrator according to one embodiment, FIG. 3 is a bottom view of an upper disk in the secondary battery material disintegrator according to one embodiment, FIG. 4 is a cross-sectional view of a lower disk in the secondary battery material disintegrator according to one embodiment, FIG. 5 is a bottom view of a lower disk in the secondary battery material disintegrator according to one embodiment, FIG. 6 is a perspective view showing a lower disk and a separator in the secondary battery material disintegrator according to one embodiment, and FIG. 7 is a cross-sectional view of an upper disk and a lower disk in the secondary battery material disintegrator according to one embodiment when combined.

[0045] Referring to FIGS. 1 to 7, a secondary battery material disintegration device (100) according to one embodiment includes a housing (10), an upper disk (20), a lower disk (30), and a separator (40) disposed inside the housing (10).

[0046] The housing (10) may be cylindrical in shape and includes an inlet (11) through which raw materials are introduced and an outlet (12) through which crushed raw materials are discharged. The inlet (11) may be formed in the upper center of the housing (10), and the outlet (12) may be formed on the outside of the housing (10).

[0047] The upper disk (20) and the lower disk (30) are rotatably arranged facing each other within the housing (10), and a disintegration space (S) is formed between the upper disk (20) and the lower disk (30). The upper disk (20) and the lower disk (30) may be made of stainless steel (SUS). Therefore, when dry disintegration is performed, the disks do not break due to thermal expansion of the disks with continuous use, thereby ensuring a continuous production system for secondary battery materials.

[0048] The upper disk (20) and the lower disk (30) are each coupled with a rotation shaft (24, 34) and a motor (25, 35) to be able to rotate in the forward or reverse direction, and the rotation speed can be 2900 rpm or more and 3600 rpm or less. This is a value required to obtain a secondary battery material having a desired particle size and tap density. In the present embodiment, since the raw material is crushed by striking the raw material through high-speed rotation of a plurality of pins, a rotation speed of at least 2900 rpm or more must be secured, and considering the crushing efficiency in relation to the speed, 3600 rpm or less is preferable.

[0049] The upper disk (20) includes a plurality of first tracks (21) formed at a predetermined distance from the center in a radial direction, and a plurality of first pinholes (22) arranged in a circumferential direction between the plurality of first tracks (21).

[0050] A plurality of first tracks (21) are formed into a plurality of stages at a predetermined interval in the radial direction, and in this embodiment, it is shown that they are formed into four stages, but it is not limited thereto.

[0051] A plurality of first tracks (21) can be formed by being recessed downward from the upper surface of the upper disk (20). This is to secure a space for crushing the raw material between the plurality of first tracks (21) and the plurality of second pins (33) described later.

[0052] The plurality of first pinholes (22) may be formed in multiple stages between the stages of the plurality of first tracks (21). Referring to FIG. 3, the first stages (22a) and the second stages (22b) of the plurality of first pinholes (22) may be arranged with the first stages (21a) of the plurality of first tracks (21) interposed therebetween, and the second stages (22b) and the third stages (22c) of the plurality of first pinholes (22) may be arranged with the second stages (21b) of the plurality of first tracks (21) interposed therebetween. In the present embodiment, the plurality of first pinholes (22) are shown as being formed in four stages, but the present invention is not limited thereto.

[0053] A plurality of first pins (23) are coupled to a plurality of first pin holes (22). The plurality of first pins (23) can be detachably coupled to the plurality of first pin holes (22). For example, screw threads may be formed on the lower outer surfaces of the plurality of first pins (23) and the inner surfaces of the plurality of first pin holes (22) to be screw-coupled, or the lower ends of the plurality of first pins (23) may be formed to be larger than the inner diameters of the plurality of first pin holes (22) to be fitted into the plurality of first pin holes (22). The present invention is not limited thereto, and various modifications are possible. In the present embodiment, since the plurality of first pins (23) are detachably coupled to the plurality of first pin holes (22), maintenance of the plurality of first pins (23) is convenient, and there is an advantage in that the gap between the pins can be easily adjusted.

[0054] The plurality of first pins (23) may have a circular or polygonal cross-section and a diameter of 10 mm or more and 12 mm or less. This is a required value depending on the design of the device. In order to obtain strength for crushing raw materials, the diameter must be at least 10 mm, and in order to arrange as many pins as possible within the limited space of the crushing device, the diameter is preferably 12 mm or less.

[0055] The gap (d1) between the pins of the plurality of first pins (23) arranged in each stage may be 1.4 mm or more and 3.4 mm or less. This is a value required to obtain a secondary battery material having a desired particle size and tap density. If it is 1.4 mm or less, the particle size may become too small and the raw material may be powdered, and if it is 3.4 mm or more, the particle size may become too large and the crushing rate may decrease. The gap between the pins of the plurality of first pins (23) may be adjusted by adjusting the joint clearance when combining the plurality of first pins (23) into the plurality of first pin holes (22) or by varying the diameter of the first pins (23).

[0056] The lower portions of the plurality of first pins (23) are connected to the plurality of first pin holes (22), and the upper portions are arranged to face the plurality of second tracks (31) described later. Therefore, a space for crushing the raw material can be secured between the plurality of first pins (23) and the plurality of second tracks (31).

[0057] The lower disk (30) includes a plurality of second tracks (31) formed at a predetermined distance from the center in a radial direction, and a plurality of second pinholes (32) arranged in a circumferential direction between the plurality of second tracks (31).

[0058] A plurality of second tracks (31) are formed in a plurality of stages at a predetermined interval in the radial direction, and can be arranged alternately with a plurality of first tracks (21) in the radial direction. In the present embodiment, the plurality of second tracks (31) are shown as being formed in four stages, but are not limited thereto.

[0059] A plurality of second tracks (31) can be formed by being recessed downward from the upper surface of the lower disk (30). This is to secure a space for the raw material to be crushed between the plurality of second tracks (31) and the plurality of first pins (23).

[0060] The plurality of second pinholes (32) may be formed in multiple stages between the stages of the plurality of second tracks (31). Referring to FIG. 5, the first stages (31a) and the second stages (31b) of the plurality of second tracks (31) may be arranged with the first stages (32a) of the plurality of second pinholes (32) interposed therebetween, and the second stages (31b) and the third stages (31c) of the plurality of second tracks (31) may be arranged with the second stages (32b) of the plurality of second pinholes (32) interposed therebetween. In the present embodiment, the plurality of first pinholes (22) are shown as being formed in four stages, but the present invention is not limited thereto.

[0061] A plurality of second pins (33) are coupled to a plurality of second pinholes (32). The plurality of second pins (33) can be detachably coupled to the plurality of second pinholes (32). For example, threads may be formed on the lower outer surfaces of the plurality of second pins (33) and the inner surfaces of the plurality of second pinholes (32) to be screw-coupled, or the lower ends of the plurality of second pins (33) may be formed to be larger than the inner diameters of the plurality of second pinholes (32) to be fitted into the plurality of second pinholes (32). The present invention is not limited thereto, and various modifications are possible. In the present embodiment, since the plurality of second pins (33) are detachably coupled to the plurality of second pinholes (32), maintenance of the plurality of second pins (33) is convenient, and the gap between pins can be easily adjusted.

[0062] The plurality of second pins (33) may have a circular or polygonal cross-section and a diameter of 10 mm or more and 12 mm or less. This is a required value depending on the design of the device. In order to obtain strength for crushing raw materials, the diameter should be at least 10 mm, and in order to arrange as many pins as possible within the limited space of the crushing device, the diameter is preferably 12 mm or less.

[0063] The gap (d1) between the pins of the plurality of second pins (33) arranged in each stage may be 1.4 mm or more and 3.4 mm or less. This is a value required to obtain a secondary battery material having a desired particle size and tap density. If it is 1.4 mm or less, the particle size may become too small and the raw material may be pulverized, and if it is 3.4 mm or more, the particle size may become too large and the crushing rate may decrease. The gap between the pins of the plurality of second pins (33) may be adjusted by adjusting the joint clearance when joining the plurality of second pins (33) to the plurality of second pin holes (32) or by making the diameters of the second pins (33) different.

[0064] The lower portions of the plurality of second pins (33) are connected to the plurality of second pin holes (32), and the upper portions are arranged to face the plurality of first tracks (21). Therefore, a space for crushing the raw material can be secured between the plurality of second pins (33) and the plurality of first tracks (21).

[0065] A plurality of first pins (23) and a plurality of second pins (33) can be alternately arranged radially from the center of the disk. Referring to Fig. 7, the first end (23a) of the first pin (23) is arranged at the innermost side of the disk, and the first end (33a) of the second pin (33) is arranged radially outside the first end (23a). With this arrangement, the fourth end (33d) of the second pin (33) is arranged at the outermost side of the disk in the radial direction.

[0066] The ratio (a / b) of the diameter (a) of the circumscribed circle that circumscribes the pins arranged at the innermost side among the plurality of first pins (23) and the plurality of second pins (33) and the diameter (b) of the inscribed circle that inscribes the pins arranged at the outermost side may be 0.4 to 0.5. That is, it is preferable that the area where the pins are arranged in the disk is 40% or more and 50% or less. This is a value related to the crushing efficiency, and it is preferable that the area where the pins are arranged is 50% or less for smooth input and distribution of raw materials, and the area where the pins are arranged should be 40% or more for securing a desirable crushing efficiency. Referring to Fig. 7, it can be expressed as the ratio (a / b) of the diameter (a) of the circumscribed circle that circumscribes the pins of the first stage (23a) arranged at the innermost side of the disk and the diameter (b) of the inscribed circle that inscribes the pins of the fourth stage (33d) arranged at the outermost side.

[0067] The gap (d2) between the first pin (23) and the second pin (33) adjacently arranged in the radial direction of the disk may be 0.5 mm or more and 1.0 mm or less. This is a value required to obtain a secondary battery material having a desired particle size and tap density. If it is 0.5 mm or less, the particle size may become too small and the raw material may be pulverized, and if it is 1.0 mm or more, the particle size may become too large and the crushing rate may decrease. For example, it refers to the gap between the first end (23a) of the first pin (23) and the first end (33a) of the second pin (33), the gap between the first end (33a) of the second pin (33) and the second end (23b) of the first pin (23), and the gap between the second end (23b) of the first pin (23) and the second end (33b) of the second pin (33).

[0068] The gap between the first pin (23) and the second pin (33) that are arranged adjacently in the radial direction of the disk can be adjusted by varying the diameter or the coupling clearance of the first pin (23) or the second pin (33). That is, the gap between the first pin (23) and the second pin (33) can be adjusted by varying the diameter of the first pin (23) or the second pin (33), adjusting the coupling clearance when coupling the first pin (23) to the first pin hole (22), or adjusting the coupling clearance when coupling the second pin (33) to the second pin hole (32).

[0069] The separator (40) distributes the raw material introduced into the shredding space (S) to the outside of the upper disk (20) and the lower disk (30), and may be placed on at least one of the upper disk (20) and the lower disk (30). In the present embodiment, the separator (40) is shown to be coupled to the rotational axis of the lower disk (30), but the present invention is not limited thereto, and may be placed on either the upper disk (20) and the lower disk (30), or on both the upper disk (20) and the lower disk (30).

[0070] The separator (40) may include at least one blade (41) for uniform and smooth distribution of raw materials introduced into the disintegration space (S). In this embodiment, a configuration including three blades (41) is illustrated, but the present invention is not limited thereto.

[0071] Hereinafter, with reference to Tables 1 to 3, the results of crushing raw materials using a crushing device for secondary battery materials according to one embodiment and a comparative example will be examined.

[0072] Table 1 is a table showing the specifications of the disintegration devices of the examples and comparative examples, Table 2 is a table showing the results of the process products disintegrated according to the examples and comparative examples, and Table 3 is a table showing the results of the final products disintegrated according to the examples and comparative examples.

[0073] Disc type Number of pins Pin spacing (mm) Rotation speed (rpm) Example SUS50012966 Comparative example Ceramic None None 1780

[0074] Referring to Table 1, the example is a shredder device with a disk material of SUS, 500 pins, a pin spacing of 1 mm, and a rotation speed of 2966 rpm, and the comparative example is a shredder device with a disk material of ceramic, no pins, and a rotation speed of 1780 rpm.

[0075] Classification D50 (㎛) D90 (㎛) Tap density (g / cc) BET Example 15.1~15.7 22.2~25.8 1.03~1.10 1.2 Comparative Example 13.1~17.3 20.6~28.5 0.97~1.08 0.9

[0076] Referring to Table 2, in the case of the examples, the average particle diameter (D50) and particle size (D90) of the processed product were both smaller than those of the comparative examples, and the tap density and specific surface area (BET) were both larger than those of the comparative examples. Therefore, it can be seen that the particle size was reduced and the tap density was increased in the case of the examples.

[0077] Classification D50 (㎛) D90 (㎛) Tap Density (g / cc) BET Example 15.3 23.4 1.0 21.0 Comparative Example 15.9 24.5 1.0 0.9

[0078] Referring to Table 3, it can be seen that in the final product, the average particle diameter (D50) and particle size (D90) of the Example were both smaller than those of the Comparative Example, and the tap density and specific surface area (BET) were both larger than those of the Comparative Example. Therefore, it can be seen that the particle size was reduced and the tap density was increased in the case of the Example. Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and it is possible to implement various modifications within the scope of the claims, the description of the invention, and the attached drawings, and this also falls within the scope of the present invention.

[0079] [Explanation of symbols]

[0080] 100: Shredding device

[0081] 10: Housing

[0082] 11: Inlet

[0083] 12: Exhaust

[0084] 20: Upper disc

[0085] 21: Track 1

[0086] 22: First pinhole

[0087] 23: First pin

[0088] 30: Lower disc

[0089] 31: Track 2

[0090] 32: Second pinhole

[0091] 33: Second pin

[0092] 40: Separator

Claims

1. A housing including a raw material inlet and outlet, A first disk and a second disk are arranged facing each other and rotatably within the housing, and a disintegration space is formed between them; A separator is coupled to the rotation axis of at least one of the first disk and the second disk, and distributes the raw material introduced into the shredding space to the outside of the first disk and the second disk, The first disk includes a plurality of first tracks formed at predetermined intervals in the radial direction, and a plurality of first pinholes arranged in the circumferential direction between the plurality of first tracks, The second disk includes a plurality of second tracks formed at predetermined intervals in the radial direction and arranged alternately with the plurality of first tracks, and a plurality of second pinholes arranged circumferentially between the plurality of second tracks. A secondary battery material disintegration device further comprising a plurality of first pins coupled to the plurality of first pinholes and a plurality of second pins coupled to the plurality of second pinholes.

2. In paragraph 1, A secondary battery material shredding device, wherein the plurality of first pins are arranged facing the plurality of second tracks, and the plurality of second pins are arranged facing the plurality of first tracks.

3. In paragraph 1, A shredding device for secondary battery materials, wherein the separator comprises at least one blade.

4. In paragraph 1, A secondary battery material shredding device, wherein the plurality of first tracks and the plurality of second tracks are formed by insertion.

5. In paragraph 1, The above plurality of first tracks are arranged at a predetermined distance in the radial direction from the center of the first disk, A secondary battery material shredding device, wherein the plurality of second tracks are arranged at a predetermined distance in a radial direction from the center of the second disk.

6. In paragraph 1, A secondary battery material shredding device, wherein the spacing between the plurality of first pins and the plurality of second pins arranged adjacently in the radial direction is 0.5 mm or more and 1.0 mm or less.

7. In paragraph 1, A secondary battery material shredding device, wherein the diameters of the plurality of first pins and the plurality of second pins are 10 mm or more and 12 mm or less.

8. In paragraph 1, A secondary battery material disintegration device, wherein the plurality of first pins are detachably arranged in the plurality of first pinholes, and the plurality of second pins are detachably arranged in the plurality of second pinholes.

9. In paragraph 8, A secondary battery material disintegration device, wherein the plurality of first pins are coupled to the plurality of first pin holes by screw coupling, and the plurality of second pins are coupled to the plurality of second pin holes by screw coupling.

10. In paragraph 1, A secondary battery material disintegration device, wherein the plurality of first pins and the plurality of second pins have a circular or polygonal cross-section.

11. In paragraph 1, A secondary battery material crushing device, wherein the first disk and the second disk are made of stainless steel (SUS).

12. In paragraph 1, A secondary battery material disintegration device, wherein the spacing between the plurality of first pins and the plurality of second pins arranged adjacently in the radial direction is controlled by the diameter or joint clearance of at least one of the plurality of first pins and the plurality of second pins.

13. In paragraph 1, A secondary battery material shredding device, wherein the rotation speed of the first disk and the second disk is 2900 rpm or more and 3600 rpm or less.

14. In paragraph 1, The spacing between the plurality of first pins is 1.4 mm or more and 3.4 mm or less, A secondary battery material disintegration device, wherein the spacing between the plurality of second pins is 1.4 mm or more and 3.4 mm or less.

15. In paragraph 1, A secondary battery material disintegration device, wherein the ratio (a / b) of the diameter (a) of the circumscribed circle that contacts the innermost pins among the plurality of first pins and the plurality of second pins and the diameter (b) of the inscribed circle that contacts the outermost pins is 0.4 to 0.5.

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