Screw feeder for transferring battery shreds

Abstract

The present invention relates to a screw feeder for transferring battery shreds. The screw feeder comprises: a housing surrounding a screw arranged in parallel with the direction of movement of the battery shreds; an input unit to which the battery shreds are input; a transfer unit for transferring the battery shreds input to the input unit; and a discharge unit for discharging the battery shreds. The screw feeder satisfies Formula 1 in the present specification.

Description

Screw conveying device for conveying battery shredders

[0001] The present invention relates to a battery processing device, and more specifically, to a screw transport device for transporting battery waste.

[0002] As global demand for electric vehicles grows, the disposal of waste batteries generated from these vehicles is emerging as a social issue. Lithium secondary batteries, the primary raw material for these waste batteries, contain organic solvents, explosive materials, and heavy metals such as nickel, cobalt, manganese, and iron. However, nickel, cobalt, manganese, and lithium are valuable metals with high scarcity value. Therefore, the recovery and recycling processes for discarded lithium secondary batteries are emerging as a key research area.

[0003] Specifically, a lithium secondary battery is mainly composed of copper and aluminum used as a current collector, Li, Ni, Co, Mn containing oxides constituting a positive electrode material, and graphite used as an negative electrode material, and includes a separator separating the positive electrode material and the negative electrode material, and an electrolyte injected into the separator. The solvent and salt used as the electrolyte are mainly a mixture of carbonate organic substances such as ethylene carbonate and propylene carbonate, and LiPF6 is used as a representative salt.

[0004] In order to utilize the above-mentioned waste batteries, development is actively underway on a waste battery recycling process that performs a preprocess of crushing the waste batteries to produce intermediate materials such as waste battery shreds or black powder, and then a postprocess to recover valuable metals.

[0005] The above-mentioned waste battery has a positive electrode made of thin aluminum metal, a negative electrode made of thin copper metal, and a separator made of vinyl material such as polyethylene. This structure is laminated, and this laminated state is like a book, so when pushed sideways, it is easy to push, but when pushed thicknesswise, it compresses under a certain load and then becomes completely immobile, causing the transport device to stop.

[0006] Due to the above problems, conveyor belts are used for transportation rather than screw transportation in most cases, but conveyor belt transportation can cause electrolyte gas to escape to the outside, causing odor and health problems.

[0007] Therefore, in a screw-based conveying device, research is needed to develop a process that can increase the efficiency of the equipment, enable the use of the equipment for a long time when conveying shredded materials, and increase the efficiency of operation by reducing equipment failures.

[0008] The technical problem to be solved by the present invention is to provide a screw conveying device that can increase the efficiency of equipment, develop a process that can use equipment for a long time when conveying shredded material, and increase the efficiency of operation by causing less equipment breakdown.

[0009] According to one embodiment of the present invention, a screw transport device is provided for transporting battery shreds, comprising: a housing enclosing a screw arranged in parallel with the direction of movement of the battery shreds; an input portion into which the battery shreds are input; a transport portion for transporting the battery shreds input into the input portion; and a discharge portion for discharging the battery shreds, and can satisfy the following equation 1.

[0010] <Formula 1>

[0011] 0.01 ≤ A / B < 0.25

[0012] (In the above formula 1, A means the distance between the top of the screw and the inner wall of the housing, and B means the height of the inner wall of the housing)

[0013] In one embodiment, the discharge unit may include a pressure release unit positioned in front of the discharge unit and configured to release the pressure of the transported battery shreds. In one embodiment, the pressure release unit (130) may include a cutting unit configured to cut the battery shreds into a predetermined size.

[0014] In one embodiment, the screw may be positioned so as to extend from the input portion toward the direction of movement of the battery shredder. In one embodiment, the screw may not be positioned beyond the end of the transport portion.

[0015] In one embodiment, the screw may be arranged to extend upward from the inlet portion toward the outlet portion and may be arranged to contact the side wall of the housing. In one embodiment, the diameter of the screw may decrease as it moves from the inlet portion toward the outlet portion.

[0016] In one embodiment, the diameter of the screw disposed above the discharge portion may be smaller than the diameters of the screws disposed in the input portion and the transfer portion. In one embodiment, the screw includes an edge portion arranged in a spiral shape on the surface of the screw, and the edge portion may be arranged to be inclined at a predetermined angle toward a direction perpendicular to the direction in which the battery shreds are fed based on a direction parallel to the screw.

[0017] In one embodiment, the device may include a dummy edge portion extending from the edge portion and positioned within the pressure release portion. In one embodiment, the device may include a reverse transfer portion positioned between the transfer portion and the side portion of the housing.

[0018] In one embodiment, the reverse feed unit may include an edge portion that is arranged at a predetermined angle opposite to the direction in which the battery shreds are fed relative to the direction parallel to the screw. In one embodiment, the cross-sectional shape of the cutting portion may include at least one branch portion arranged in at least a portion of the main blade portion.

[0019] In one embodiment, the angle between the direction in which the battery shredder moves through the conveying portion and the direction in which the battery shredder is discharged through the discharge portion may be greater than or equal to 10°. In one embodiment, the gap between the top of the screw and the inner wall of the housing may be greater than or equal to 5 mm.

[0020] According to one embodiment of the present invention, a screw conveying device includes a pressure relief unit, thereby increasing the efficiency of the equipment, developing a process that enables the equipment to be used for a long time when conveying crushed material, and providing a screw conveying device that can increase the efficiency of operation by causing less equipment failure.

[0021] FIG. 1 is a cross-sectional view of a screw transport device according to one embodiment of the present invention.

[0022] Figure 2 is a cross-sectional view of a screw transport device according to another embodiment of the present invention.

[0023] FIG. 3 is a cross-sectional view of a screw transport device according to another embodiment of the present invention.

[0024] Figure 4 is a cross-sectional view of a screw transport device according to another embodiment of the present invention.

[0025] FIG. 5 is a cross-sectional view of a screw transport device according to another embodiment of the present invention.

[0026] Figures 6a to 6q illustrate various shapes of the cutting portion of the present invention.

[0027] The terms first, second, and third, etc., are used to describe, but are not limited to, various parts, components, regions, layers, and / or sections. These terms are used solely to distinguish one part, component, region, layer, or section from another part, component, region, layer, or section. Accordingly, a first part, component, region, layer, or section described below may be referred to as a second part, component, region, layer, or section without departing from the scope of the present invention.

[0028] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the present invention. As used herein, the singular forms "singular" and "comprising" include plural forms as well, unless the context clearly dictates otherwise. The word "comprising" as used herein specifies a particular feature, region, integer, step, operation, element, and / or component, but does not exclude the presence or addition of other features, regions, integers, steps, operations, elements, and / or components.

[0029] When a part is referred to as being "on" or "over" another part, it can be directly on or over the other part, or there may be other parts intervening. Conversely, when a part is referred to as being "directly on" another part, there are no other parts intervening.

[0030] Although not defined otherwise, all terms, including technical and scientific terms, used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention pertains. Terms defined in commonly used dictionaries are further interpreted to have meanings consistent with the relevant technical literature and the present disclosure, and are not to be construed as ideal or overly formal unless otherwise defined.

[0031] Hereinafter, embodiments of the present invention will be described in detail. However, these are presented as examples and the present invention is not limited thereto, and the present invention is defined only by the scope of the claims set forth below.

[0032] FIG. 1 is a drawing of a screw transport device (100) according to one embodiment of the present invention.

[0033] According to one embodiment of the present invention, a screw transport device (100) includes a housing (100H), an inlet portion (110), a transport portion (120), a pressure release portion (130), and a discharge portion (140), and may be a transport device for transporting battery shreds. Specifically, the screw transport device (100) may be a device for transporting shredded battery shreds, which have been subjected to a preprocessing process after a battery has reached the end of its lifespan, such as a waste battery, to a downstream process. The battery may be, for example, a lithium secondary battery separated from an automobile, a secondary battery separated from an electronic device, such as a mobile phone, a camera, or a laptop, and specifically, a lithium secondary battery.

[0034] The above-mentioned battery shredder is intended for recovering valuable metals from spent batteries and has a layered structure including a separator with a positive electrode and a negative electrode laminated on at least one surface. Specifically, the layered structure may include a configuration in which the positive electrode and the negative electrode are included on one surface of the separator based on the separator. More specifically, the number of layers of the layered structure may correspond to the number of separators.

[0035] The above layered structure includes, for example, one of anode-separator-cathode, separator-cathode, and cathode-separator, and for example, anode-separator-cathode-separator-anode-separator-cathode may have a three-layered layered structure. Specifically, the unit battery shredder may have a predetermined thickness in the thickness direction as at least one or more layers are laminated.

[0036] The housing (100H) may be a member for minimizing the influence of the external environment on the screw transport device (100). Specifically, the housing (100H) may be a member for protecting the battery shreds from being influenced by the external environment when they are fed and discharged through the screw transport device (100). More specifically, the housing (100H) may be a member arranged to surround a screw (SC) that assists in the movement of the battery shreds within the screw transport device (100).

[0037] In one embodiment, the housing (100H) may have a cross-sectional shape such as a circle or a square. This is a non-limiting example, and may have a shape that does not impede the rotation of the screw (SC) and facilitates the movement of battery waste from the input portion (110) to the output portion (140).

[0038]

[0039] The screw (SC) may be a member arranged inside the housing (100H) for moving the battery shreds within the screw transport device (100). Specifically, the screw (SC) may be arranged to extend from the input portion (110) toward the direction in which the battery shreds move. Specifically, the screw (SC) may be arranged to extend in the X-axis direction, which is the direction in which the battery shreds move.

[0040] In one embodiment, the screw (SC) may be a rotatable member. For example, the screw (SC) may include a drive unit (not shown) that receives external power. The screw (SC) may rotate and move the battery shredder by being rotated by the drive unit.

[0041] In one embodiment, the screw (SC) may include an edge portion (ED) arranged in a spiral shape on the surface of the screw (SC). Specifically, the edge portion (ED) may have a protrusion shape arranged to surround the surface of the screw (SC). For example, the cross-sectional shape of the edge portion (ED) may have a linear shape or a curved shape.

[0042] In one embodiment, the screw (SC) may not be positioned beyond the end of the conveying section (120). Specifically, the screw (SC) is positioned within the conveying section (120) and not above the discharge section (140), so that the battery shreds that rotate and move within the conveying section (120) can be discharged in the discharge direction through the discharge section (140) after undergoing a pressure release process at the pressure release section (130) positioned above the discharge section.

[0043] The edge portion (ED) is arranged in a spiral shape to surround at least a portion of the screw (SC), so that as the screw (SC) rotates, the battery shreds can be easily moved in the direction in which the discharge portion (140) is arranged.

[0044] In one embodiment, the edge portion (ED) may be arranged to be inclined at a predetermined angle toward a direction perpendicular to the direction in which the battery shreds are fed relative to the direction parallel to the screw (SC). Specifically, the edge portion (ED) may be arranged in a spiral shape with a predetermined angle α toward the Y-axis direction, which is a direction perpendicular to the direction in which the battery shreds are fed relative to the direction parallel to the screw (SC).

[0045] In one embodiment, the α angle may be an angle greater than 0° and less than 90°. By satisfying the above-described range, the movement of the battery fragments can be more easily controlled by arranging them in a diagonal shape in the cross-section.

[0046] The input section (110) can input battery shreds into the screw transport device (100). Specifically, the input section (110) is arranged to be open, thereby assisting in easily inputting battery shreds into the screw transport device (100).

[0047] In another embodiment, the input unit (110) may include a cover unit (not shown) that allows the input unit (110) to be opened and closed. By including the cover unit in the input unit (110), impurities can be prevented from being introduced into the screw transport device (100) when the screw transport device is not in operation.

[0048] The transport section (120) refers to a space where battery shreds move. Specifically, the transport section (120) may refer to a passage for transporting battery shreds fed from the input section (110) to the discharge section (140). More specifically, a screw (SC) is arranged within the transport section (120), and as the screw (SC) rotates, battery shreds can pass through the transport section (120) and move. A detailed description of the screw (SC) is the same as that described above, to the extent that it does not contradict.

[0049] The discharge unit (140) may be a member that discharges battery shreds moved via the transport unit (120). Specifically, the discharge unit (140) may be arranged so that at least a portion of the lower surface of the housing (100H) is opened to a predetermined extent. By having the discharge unit (140) arranged so that at least a portion of the lower surface of the housing (100H) is opened, the battery shreds can fall in a direction opposite to the Y-axis due to gravity and be discharged.

[0050] In one embodiment, the discharge unit (140) may include an openable cover. By including the cover, the discharge unit (140) can be opened and closed as needed, thereby preventing foreign substances such as impurities from being introduced into the screw conveying device.

[0051] In one embodiment, the screw transport device (100) may include a pressure relief unit (130). Specifically, the pressure relief unit (130) may be positioned at the front end of the discharge unit (140) and may refer to an area for releasing the pressure of the battery shreds transferred through the transfer unit (120). Specifically, releasing the pressure of the battery shreds refers to a process in which the force that compressed the shreds during the transport process is released, and the screw transport device (100) may include the pressure relief unit (130) to help discharge the battery shreds with a reduced risk of fire by reducing the pressure within the battery shreds to the discharge unit (140).

[0052] In one embodiment, the angle (θ) between the direction in which the battery shreds move through the conveying unit (120) and the direction in which they are discharged through the discharge unit (140) may be 10° or more. Specifically, the angle (θ) may be 45° or more, and more specifically, 75° or more and 170° or less. Since the direction in which the battery shreds move through the conveying unit (120) and the direction in which they are discharged through the discharge unit (140) satisfy the aforementioned angle range, there is an advantage in that the battery shreds are easily discharged through the discharge unit (140).

[0053] FIG. 2 is a cross-sectional view of a screw transport device (100) according to another embodiment of the present invention.

[0054] Referring to FIG. 2, in one embodiment, the screw transport device (100) may further include a dummy edge portion (ED'). Specifically, the dummy edge portion (ED') may be a member in which the edge portion (ED) is extended along the X-axis direction, which is the moving direction of the battery shreds. Specifically, the dummy edge portion (ED') may be extended from the edge portion (ED) and may be disposed within the pressure release portion (130). As the screw (SC) rotates, the dummy edge portion (ED') may rotate together with the edge portion (ED) disposed on the surface of the screw (SC) and the dummy edge portion (ED') connected to the edge portion (ED'). Accordingly, the battery shreds moved through the transfer unit (120) are maintained for a predetermined period of time by the dummy edge unit (ED') and then discharged to the discharge unit (140) through rotation, thereby making it easier to reduce the pressure of the battery shreds within the pressure release unit (130) and at the same time making it easier to discharge them to the discharge unit (140).

[0055] In one embodiment, the dummy edge portion (ED') may be formed integrally with the edge portion (ED). Specifically, the dummy edge portion (ED') may be formed integrally with the edge portion (ED) and may be designed such that the screw (SC) is not placed only within the dummy edge portion (ED').

[0056] FIG. 3 is a cross-sectional view of a screw transport device (100) according to another embodiment of the present invention.

[0057] Referring to FIG. 3, in one embodiment, the pressure release unit may include a cutting unit (CT). Specifically, the pressure release unit (130) may include a cutting unit (CT) that shreds battery shreds. Specifically, the cutting unit (CT) may be a member that cuts battery shreds transported through the conveying unit. Specifically, battery shreds of various shapes transported through the conveying unit can be shredded into battery shreds of similar sizes by simultaneously releasing pressure in the pressure release unit (130) and cutting in the cutting unit (CT). Accordingly, the size of the battery shreds discharged through the discharge unit (140) can be controlled to be uniform.

[0058] In one embodiment, the screw transport device (100) may include a reverse transport unit (150). The reverse transport unit (150) may be a member that assists in easily discharging a portion of the battery shreds moved through the transport unit (120) to the discharge unit (140) when the portion of the battery shreds that is not discharged to the discharge unit (140) but remains within the housing (100H). Specifically, the reverse transport unit (150) may be disposed between the transport unit (120) and a side portion of the housing (100H). More specifically, the reverse transport unit (150) may be an area disposed between the pressure relief unit (130) and the side portion of the housing (100H).

[0059] In one embodiment, the screw (SC) may be arranged to extend upward from the inlet (110) toward the outlet (140) and may be arranged to contact the side wall of the housing (100H). In one embodiment, the screw (SC) may be arranged as an integral part inside the housing (100H) and may extend to the conveying portion (120), the pressure relief portion (130), and the reverse conveying portion (150).

[0060] In one embodiment, the reverse conveyance (150) may include an edge portion (ED') that is arranged to be inclined at a predetermined angle in a direction opposite to the direction in which the battery shreds are fed relative to the direction parallel to the screw (SC). Specifically, the reverse conveyance (150) may be arranged to be inclined at an angle β in a direction opposite to the direction in which the shreds are fed. In one embodiment, the β angle may be an angle greater than 0° and less than 90°.

[0061] By ensuring that the above β angle satisfies the aforementioned range, the edge portion (ED') disposed on the surface of the screw (SC) within the reverse transfer portion (150) can move the battery shreds in the opposite direction to the edge portion (ED) disposed on the surface of the screw (SC) within the transfer portion (120). Accordingly, the battery shreds can be prevented from remaining within the screw transfer device (100) for a long period of time, thereby preventing the device from stopping.

[0062] In one embodiment, the screw transfer device (100) can satisfy the following equation 1.

[0063] <Formula 1>

[0064] 0.01 ≤ A / B < 0.25

[0065] (In the above formula 1, A means the distance between the top of the screw and the inner wall of the housing, and B means the height of the inner wall of the housing)

[0066] The above formula 1 refers to the distance between the top of the inner wall of the housing (100H) of the screw (SC) and the inner wall of the housing, and may be an indicator of the movement of battery shreds within the screw transport device (100). The above formula 1 may be 0.01 or more and less than 0.25, specifically, 0.01 to 0.125, and more specifically, 0.0125 to 0.100.

[0067] Specifically, the above A refers to the gap between the top of the screw, for example, the top of the edge portion (ED), and the housing (100H). The above B refers to the vertical height between the inner walls of the housing (100H), for example, the gap in the Y-axis direction. By satisfying the above-described range of Equation 1, the battery shreds can smoothly move from the input portion (110) to the output portion (140) within the screw transport device without stopping.

[0068] If the above equation 1 exceeds the upper limit of the aforementioned range, the gap within the conveying body becomes too large, resulting in a large stagnant region, which reduces conveying efficiency. If the above equation 1 exceeds the lower limit of the aforementioned range, the thickness of the shredded material becomes similar to the minimum thickness, which causes the shredded material to become trapped between the wall and the screw, making operation impossible.

[0069] Figure 4 is a cross-sectional view of a screw transport device according to another embodiment of the present invention.

[0070] Referring to FIG. 4, in one embodiment, the diameter of the screw (SC) may decrease as it moves from the input portion (110) toward the output portion (140). Specifically, the diameter of the screw (SC) may decrease as it moves in a horizontal direction, for example, in the X-axis direction.

[0071] As the diameter of the screw (SC) decreases in the X-axis direction, the area of ​​the area where the battery shreds are placed around the input section (110) becomes smaller, so that the pressure of the battery shreds may be high. Thereafter, as it moves toward the conveying section (120) and the pressure relief section (130), the area of ​​the area where the battery shreds are placed becomes larger, so that the pressure of the battery shreds may be lowered. Accordingly, as the battery shreds are moved by the screw (SC), the pressure of the battery shreds is lowered, and the clumping of the batteries is prevented, so that the battery shreds can be easily moved.

[0072] FIG. 5 is a cross-sectional view of a screw transport device according to another embodiment of the present invention.

[0073] In one embodiment of FIG. 5, the diameter of the screw (SC) disposed above the discharge portion (140) may be smaller than the diameters of the screws (SC) disposed in the input portion (110) and the transfer portion (120). Specifically, the diameter of the screw (SC) disposed above the discharge portion (140) may be smaller than the diameters of the screws (SC) of the transfer portion (120) and / or the reverse transfer portion (150). By disposing the screw (SC) above the discharge portion (140), specifically, within the pressure relief portion (130), to have a diameter smaller than other areas, the area of ​​the battery shreds remaining within the pressure relief portion (130) can be expanded, and the cutting portion (CT) disposed on the surface of the screw (SC) within the pressure relief portion (130) can more easily cut the battery shreds, which is advantageous.

[0074] Figures 6a to 6q illustrate various shapes of the cutting portion of the present invention.

[0075] Referring to FIGS. 6A to 6Q, the cutting portion (CT) is disposed on the surface of the screw (SC) disposed within the pressure release portion (130) and may include at least one branch portion in cross section. Specifically, the cutting portion (CT) has an inclined structure, thereby rotating together with the screw (SC) and easily cutting battery debris.

[0076] Referring to FIGS. 6a and 6b, the cross-sectional shape of the cutting portion may have a member that rotates “ㄱ” or “ㄴ”. Referring to FIGS. 6c to 6h, the cross-sectional shape of the cutting portion may have “ㅜ”, “l”, “ㅏ”, “ㅓ”, “+”, and “ㅋ”. Referring to FIGS. 6i to 6m, the cutting portion may have a slanted shape with a predetermined angle. In addition, in order to facilitate cutting of the battery shreds, a branch portion may be further included.

[0077] Referring to FIGS. 6n to 6q, the cutting portion may further include at least one branch portion positioned at least in a portion of the main blade portion. In this way, the cutting portion may include various cross-sectional shapes, thereby cutting the battery shreds into an appropriate size and shape.

[0078]

[0079] Hereinafter, preferred embodiments and comparative examples of the present invention are described. However, the following examples are only preferred embodiments of the present invention, and the present invention is not limited to the following examples.

[0080] <Experimental Example> - Gap between screw and wall

[0081] The screw conveying device of the present invention is a means for conveying battery shreds, and is a screw conveying device that discharges materials at an angle of 10° or more from the direction of injection and the horizontal after the materials are fed in during screw conveying. Specifically, it includes preparing battery shreds, moving the battery shreds within the screw, passing through a pressure relief unit for releasing the pressure of the battery shreds before discharging the battery shreds, cutting after the pressure relief unit, and discharging the battery shreds downwards through a reverse rotation unit after the discharge port. At this time, the discharge direction of the battery shreds is approximately 90° below the conveying direction.

[0082] When the gap between the blade of the screw and the inner wall of the housing surrounding the screw is 5 mm or more, the pressure load is reduced when transporting the shredded material by overlapping, and the problem of the battery shredded material being caught between the blade of the screw and the inner wall of the housing can be prevented.

[0083] Table 1 below shows whether battery shreds are transported, the motor torque ratio, and the number of trips according to the gap between the screw blade and the inner wall of the housing.

[0084] Table 1 below shows the results of an experiment on whether or not the battery shredder was transported for more than an hour using a 3 horsepower motor, the motor torque, and the number of trips. The motor torque was expressed as a percentage of the maximum output, and whether or not the battery shredder was smoothly moved to the discharge port was expressed as “possible,” “impossible,” or “impossible.” The number of trips was expressed as the number of times the motor stopped.

[0085] Housing height / Distance between screw and housing inner wall Distance between screw and housing inner wall Whether to move Motor torque ratio Number of trip occurrences Note Within 0.00251 mm Impossible 85 % or more 3 times Comparative example 0.00753 mm Possible 70 % 1 time Comparative example 0.01255 mm Possible 65 % No occurrence Example 0.028 mm Possible 60 % No occurrence Example 0.02510 mm Possible 58 % No occurrence Example 0.0312 mm Possible 58 % No occurrence Example 0.037515 mm Possible 46 % No occurrence Example 0.0520 mm Possible 40 % No occurrence Example 0.062525 mm Possible 39 % No occurrence Example 0.25100 mm Stagnation-No occurrence Comparative example

[0086] Looking at Table 1 above, it was confirmed that the motor stopped several times at a gap of less than 1 mm, there was one motor stop at 3 mm, and normal transport was performed from 5 mm, but it was confirmed that the motor torque was large. In this way, it was confirmed that the gap between the screw and the inner wall of the housing must be 5 mm or more, and it was confirmed that the gap must be 5 to 12 mm to maintain the motor torque at 50% or more while simultaneously facilitating transport of the battery shreds. It can be confirmed that a stagnant area occurs between the screw and the inner wall of the housing, making transport difficult.

[0087]

[0088] Although the preferred embodiments have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concepts defined in the following claims also fall within the scope of the present invention.

Claims

1. Regarding a screw transport device for transporting battery waste, A housing enclosing a screw arranged parallel to the direction of movement of the above battery shredder; An input section into which the above battery shredder is input; A transport unit for transporting the battery waste fed into the input unit; and Including a discharge unit for discharging the above battery fragments, A screw conveying device satisfying the following equation 1. <Formula 1> 0.01 ≤ A / B < 0.25 (In the above formula 1, A means the distance between the top of the screw and the inner wall of the housing, and B means the height of the inner wall of the housing) 2. In paragraph 1, It is placed in front of the above discharge part, A screw conveying device including a pressure relief unit for releasing the pressure of the conveyed battery waste.

3. In paragraph 2, The above pressure relief unit is a screw conveying device including a cutting unit that cuts the battery shreds into a predetermined size.

4. In paragraph 1, The screw is a screw transport device in which the screw is arranged to extend from the input portion toward the direction of movement of the battery shreds.

5. In paragraph 4, A screw transport device in which the screw is not positioned beyond the end of the transport section.

6. In paragraph 1, A screw transport device in which the screw is arranged to extend from the input portion toward the upper portion of the output portion and is arranged in contact with the side wall of the housing.

7. In paragraph 1, A screw transport device in which the diameter of the screw decreases as it moves from the input portion toward the output portion.

8. In paragraph 1, A screw transport device in which the diameter of the screw disposed in the upper portion of the discharge section is smaller than the diameter of the screw disposed in the input section and the transport section.

9. In paragraph 1, The above screw includes an edge portion arranged in a spiral shape on the surface of the screw, A screw transport device in which the edge portion is arranged to be inclined at a predetermined angle toward a direction perpendicular to the direction in which the battery shreds are fed based on the direction parallel to the screw.

10. In paragraph 9, A screw conveying device comprising a dummy edge portion extending from the edge portion and positioned within the pressure relief portion.

11. In paragraph 1, A screw transfer device comprising a reverse transfer portion arranged between the transfer portion and the side portion of the housing.

12. In paragraph 11, The above-mentioned reverse transfer unit is a screw transfer device including an edge portion that is arranged to be inclined at a predetermined angle in a direction opposite to the direction in which the battery waste is fed based on the direction parallel to the screw.

13. In paragraph 1, A screw conveying device in which the central axes of the above-mentioned input section and the above-mentioned conveying section have the same axis in the horizontal direction.

14. In paragraph 1, The above discharge portion is a screw transport device in which at least a portion of the lower surface of the housing is an open area.

15. In paragraph 1, A screw conveying device wherein the angle between the direction in which the battery shreds move through the conveying portion and the direction in which the battery shreds are discharged through the discharge portion is 10° or more.

16. In paragraph 1, A screw transport device in which the gap between the top of the screw and the inner wall of the housing is 5 mm or more.

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