Powder discharging device for secondary battery

Abstract

Provided is a powder discharge device for a secondary battery, comprising: a hopper having an accommodating space for accommodating a powder and a discharge port for discharging the powder; a drive shaft having a shape extending in a first direction, at least a portion of the drive shaft being disposed inside the hopper; the driving motor is connected to the driving shaft and rotates the driving shaft; the spiral blade is connected to the circumferential surface of the driving shaft, and the spiral blade comprises a first blade body and a second blade body which are different in radius. According to the powder discharging device for the secondary battery, the agglomeration of the powder can be reduced, and the powder can be smoothly discharged.

Description

Technical Field

[0001] The utility model relates to a powder discharging device for secondary batteries. Background Art

[0002] Different from primary batteries, secondary batteries have the convenience of being rechargeable and discharged, so they have attracted much attention as power sources for various mobile devices and power sources for electric vehicles, etc. For example, a plurality of secondary batteries of a type using a non-aqueous electrolyte with high energy density can be connected to form a battery module, and such a battery module can be used as a power source for an electric vehicle.

[0003] As secondary batteries, lead-acid secondary batteries, nickel-cadmium secondary batteries, nickel-metal hydride secondary batteries, and lithium-ion secondary batteries are mainly used. Among them, lithium-ion secondary batteries are small and lightweight, have a high energy density, and excellent large-current load characteristics.

[0004] Lithium salts such as lithium cobaltate are used in the positive electrode active material of lithium-ion secondary batteries, and carbonaceous materials such as graphite are used in the negative electrode active material. As the carbon material constituting the negative electrode of such a lithium-ion secondary battery, a granular graphite-based material is mainly used, and graphite is mixed to ensure both cost and structural stability.

[0005] In the past, graphite was put into a mixing device using a hopper. Due to the characteristics of graphite, graphite can agglomerate (cluster), and the agglomeration phenomenon of graphite may be more serious near the discharge port. When the agglomeration phenomenon of graphite is serious, there is a problem that the powder cannot be put into the mixing device or the powder input speed may become slow. Summary of the Utility Model

[0006] Technical Problem

[0007] At least some embodiments of the present utility model can provide a powder discharging device for secondary batteries that can reduce the agglomeration of powder.

[0008] At least some embodiments of the present utility model can provide a powder discharging device for secondary batteries that can smoothly discharge powder.

[0009] Technical Solution

[0010] As an aspect for achieving at least some of the above purposes, there is provided a powder discharging device for secondary batteries, including: a hopper having an accommodation space for accommodating powder and a discharge port for discharging the powder; a drive shaft at least partially disposed inside the hopper and having a shape extending in a first direction; a drive motor connected to the drive shaft for rotating the drive shaft; and a spiral blade connected to the circumferential surface of the drive shaft, the spiral blade including a first blade and a second blade with different radii.

[0011] In one embodiment, the first blade may be disposed at a position opposite to the discharge port, and the second blade may be disposed at at least one of both ends of the first direction of the spiral blade.

[0012] In one embodiment, the spiral blade may be configured to be spaced apart from the inner surface of the hopper so that the blade portion does not touch the hopper.

[0013] In one embodiment, the radius of the first blade may be greater than the radius of the second blade.

[0014] In one embodiment, the spiral blade may further include a third blade disposed between the first blade and the second blade.

[0015] In one embodiment, the radius of the third blade may be less than the radius of the first blade and greater than the radius of the second blade.

[0016] In one embodiment, there are a plurality of the first blades and the second blades, and the radius of the first blade may be greater than the radius of the second blade.

[0017] In one embodiment, the first blade may be disposed between the second blades.

[0018] In one embodiment, an inclined portion may be formed on the lower surface of the hopper, and the discharge port may be formed below the inclined portion.

[0019] In one embodiment, the drive shaft may be in contact with the inclined portion.

[0020] In one embodiment, the radius of the first blade may be more than twice the radius of the second blade.

[0021] In one embodiment, the powder discharging device for secondary batteries may further include a vibration unit that is in contact with the inclined portion and transmits vibration to the hopper.

[0022] In one embodiment, a switchable valve may be connected to the discharge port.

[0023] On the other hand, provided is a powder discharging device for secondary batteries for achieving at least a part of the above object, including: a hopper having an accommodation space for accommodating powder and a discharge port for discharging the powder, the discharge port being formed at a lower end thereof; a drive shaft having a shape extending in a first direction, at least a part of which is disposed inside the hopper; a drive motor connected to the drive shaft and rotating the drive shaft; and a plurality of spiral members connected to a circumferential surface of the drive shaft and extending outward in a radial direction of the drive shaft, at least a part of the plurality of spiral members being disposed at a position opposite to the discharge port.

[0024] In one embodiment, each of the plurality of spiral members may include a flange portion formed at one end.

[0025] In one embodiment, the flange portion may have a shape extending in the first direction.

[0026] In one embodiment, the plurality of spiral members include a first spiral member disposed at a position opposite to the discharge port and a second spiral member disposed at at least any one of both ends of the plurality of spiral members in the first direction, and the length of the first spiral member may be longer than the length of the second spiral member.

[0027] Technical effects

[0028] According to one embodiment of the present utility model having such a configuration, agglomeration of powder can be reduced.

[0029] According to one embodiment of the present utility model having such a configuration, the powder can be discharged smoothly. Description of the drawings

[0030] Figure 1 is a perspective view of a powder discharging device for a secondary battery according to one embodiment of the present utility model;

[0031] Figure 2 is along Figure 1 sectional view taken along line I-I' of;

[0032] Figure 3 is a perspective view showing Figure 1 the state in which powder is accommodated in the powder discharging device for a secondary battery of;

[0033] Figure 4 is a explanatory view of Figure 1 the spiral blade shown;

[0034] Figure 5 is Figure 4 a modified example of the spiral blade shown;

[0035] Figure 6 is a perspective view of a powder discharging device for a secondary battery according to another embodiment of the present utility model;

[0036] Figure 7 is a explanatory view of Figure 6 the spiral member shown.

[0037] Description of reference numerals

[0038] 10, 20: Powder discharging device for secondary battery 100: Hopper

[0039] 200: Drive shaft 300: Drive motor

[0040] 400: Spiral blade 500: Spiral component

[0041] 600: Vibration unit Detailed implementation mode

[0042] Before explaining the present invention in detail, the terms or words used in this specification shall not be construed in accordance with the general or dictionary meanings, but shall be construed in accordance with the principle that the inventor can appropriately define the concept of the terms in order to explain his invention by the best method, and shall be construed as meanings and concepts consistent with the technical idea of the present invention. Therefore, the embodiments described in this specification and the components shown in the drawings are merely one embodiment of the present invention, and do not comprehensively represent the technical idea of the present invention. Therefore, it should be understood that there may be various equivalents and modification examples that can replace these at the time of applying for this application.

[0043] In the following description, unless otherwise clearly indicated in the context, the singular description includes the plural description. It should be understood that terms such as "including" or "comprising" are used to specify the existence of features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and do not preclude the existence or additional possibility of one or more other features or numbers, steps, actions, components, parts, or combinations thereof.

[0044] Moreover, it is hereby declared in advance that the descriptions such as upper side, upper part, lower side, lower part, side, front, and rear in the following description are described based on the directions shown in the drawings, and different descriptions may be available when the directions of the objects are changed.

[0045] Moreover, in this specification, ordinal terms such as "first" and "second" may be used to distinguish components. These ordinal numbers are used to distinguish the same or similar components from each other, and the meanings of the terms shall not be construed restrictively because of the use of these ordinal numbers. As an example, the components combined with these ordinal numbers cannot be construed restrictively in terms of the use order or configuration order, etc. due to the numbers. As needed, each ordinal number can also be used interchangeably.

[0046] The following describes the embodiments of the present invention with reference to the drawings. However, the idea of the present invention is not limited to the proposed embodiments. For example, those of ordinary skill in the art who understand the idea of the present invention can propose other embodiments within the scope of the idea of the present invention by adding, changing, or deleting components, etc., and this also falls within the scope of the idea of the present invention. The shapes and sizes of the elements in the drawings may be exaggerated for clearer explanation.

[0047] Figure 1 It is a perspective view of a powder discharging device for a secondary battery according to an embodiment of the present invention.Figure 2 is a sectional view taken along the line I-I’ of Figure 1 . Figure 3 is a perspective view showing the state in which the powder for the secondary battery Figure 1 is accommodated in the powder discharging device. Figure 4 is an explanatory view of the Figure 1 shown spiral blade. Figure 5 is Figure 4 a modified example of the shown spiral blade. Figure 2 In order to clearly illustrate the drive shaft and the hopper, the vibration unit is omitted.

[0048] First, referring to Figures 1 to 3 , the powder discharging device 10 for a secondary battery according to an embodiment of the present invention may include a hopper 100, a drive shaft 200, a drive motor 300, and a spiral blade 400.

[0049] The hopper 100 may be composed of an upper surface 100a forming an inlet I and a lower surface 100b forming an outlet O. As an example, the upper surface 100a of the hopper may be formed in a cylindrical shape, and a part of the lower surface 100b of the hopper may be formed in a conical shape whose sectional area becomes narrower as it goes downward.

[0050] An accommodation space S capable of accommodating the powder P may be formed inside the upper surface 100a and the lower surface 100b of the hopper. The hopper 100 can protect and store the powder P accommodated inside from the outside environment. The powder P may be carbon powder used as a negative electrode active material of a secondary battery, and the carbon powder may be artificial graphite or natural graphite. However, it is not limited thereto, and a slurry for a secondary battery may be accommodated in the accommodation space S instead of the powder P.

[0051] The upper surface 100a of the hopper may be formed with an inlet I. As an example, the inlet I is formed at the upper end of the upper surface and may have a circular cross section. The powder P may be introduced into the powder discharging device 10 for a secondary battery through the inlet I formed in the upper surface 100a of the hopper.

[0052] The lower surface 100b of the hopper may be formed with an inclined portion. For example, the inclined portion may be formed such that its sectional area becomes smaller as it goes downward in the hopper 100. The powder P accommodated in the accommodation space S of the hopper 100 may move downward along the inclined portion.

[0053] A nozzle (not shown) for injecting air into the interior may be further disposed on the lower surface 100b of the hopper. The nozzle may be disposed on the inclined portion, and the nozzle may inject air into the powder P laminated on the inclined portion. The injected air can prevent the powder P laminated on the inclined portion from agglomerating.

[0054] The lower end of the hopper 100 may be formed with a discharge port O. The discharge port O may be formed at the lower part of the inclined portion. For example, the discharge port O is formed at the central portion of the lower end of the hopper 100 and may have a circular cross-section. The powder P moving downward along the inclined portion may be discharged to the outside of the hopper 100 through the discharge port O.

[0055] A switchable valve 700 may be connected to the discharge port O. When the valve 700 is opened, the powder P may be discharged to the outside through the discharge port O. When the valve 700 is closed, the powder P will not be discharged to the outside through the discharge port O.

[0056] The powder discharging device 10 for a secondary battery according to an embodiment of the present utility model may further include a vibration unit 600.

[0057] The vibration unit 600 contacts the inclined portion and is capable of transmitting vibration to the hopper 100. Specifically, the vibration unit 600 may apply vibration to the contacted inclined portion. Therefore, vibration can be transmitted to the powder P disposed on the inclined portion, and the powder P can move downward along the inclined portion of the hopper 100 in a state where no aggregation occurs.

[0058] See Figure 1 and Figure 3 , two vibration units 600 are configured to contact the inclined portion, but it is not limited thereto. For example, more vibration units 600 may be further disposed on the inclined surface, and the vibration units 600 may also be configured to surround a part of the inclined portion.

[0059] At least a part of the drive shaft 200 may be disposed inside the hopper 100. The drive shaft may be configured to contact the inclined portion. As an example, the drive shaft 200 may have a shape extending in the first direction (X direction) and may be configured to penetrate the central portion of the inclined portion. However, it is not limited thereto, and the drive shaft 200 may be composed of a shaft connecting the inside of the hopper 100 and disposed inside the hopper 100.

[0060] The drive shaft 200 may be connected to the drive motor 300. The drive shaft 200 may receive the driving force from the drive motor 300 and rotate in the clockwise or counterclockwise direction. The drive motor 300 may be disposed outside the hopper 100 and may be connected to one end of the drive shaft 200.

[0061] The spiral blade 400 may be connected to the circumferential surface of the drive shaft 200. The spiral blade 400 may be disposed inside the hopper 100. The spiral blade 400 is configured in a spiral shape and may include a plurality of blades 400a, 400b with different radii. The plurality of blades 400a, 400b may be disposed in a direction almost perpendicular to the drive shaft 200. This does not mean that it is configured to be completely perpendicular to the drive shaft 200, but may represent a state inclined from the direction perpendicular to the drive shaft 200. For example, the plurality of blades 400a, 400b may be disposed to form an acute angle with respect to the third direction (Z direction).

[0062] When the drive shaft 200 rotates, the spiral blade 400 connected to the drive shaft 200 can also rotate together. The drive shaft 200 may have a shape extending in the first direction (X direction), and the spiral blade 400 can rotate with reference to the first axis (X axis). The spiral blade 400 can stir the powder P disposed inside the hopper 100 while rotating with reference to the first axis (X axis). The powder P can move toward one end in the first direction (X direction) through the spiral blade 400. For example, the powder P can move toward the inclined portion, and the powder P moved through the spiral blade 400 can move along the inclined portion.

[0063] Next, referring to Figures 1 to 4 , the spiral blade 400 according to an embodiment of the present invention will be described.

[0064] The spiral blade 400 may include a first blade 400a and a second blade 400b having different radii. The first blade 400a and the second blade 400b may have a circular or elliptical shape. When the first blade 400a and the second blade 400b are both circular as a whole, the radius L1 of the first blade and the radius L2 of the second blade may be different from each other. When the first blade 400a and the second blade 400b are both elliptical as a whole, the major semi-axis of the first blade and the major semi-axis of the second blade may be different from each other. However, for the sake of convenience of description in this specification, the case where the blades are circular as a whole will be described.

[0065] The first blade 400a may be disposed at the center of the spiral blade 400 and may be disposed at a position opposite to the discharge port O. For example, the first blade 400a may be disposed at a position opposite to the discharge port O along the third direction (Z direction).

[0066] The second blade 400b may be disposed at at least any one of both ends of the spiral blade 400. Since the spiral blade 400 is disposed along the drive shaft 200 in the first direction (X direction), the second blade 400b may be disposed at at least any one of both ends of the spiral blade 400 in the first direction (X direction). Also, the second blade 400b may be disposed on both sides in the first direction (X direction).

[0067] The second blade 400b may be disposed adjacent to the lower surface 100b of the hopper. When the second blade 400b contacts the lower surface 100b of the hopper, the second blade 400b may be damaged. The same applies to the first blade 400a. Therefore, the spiral blade 400 including the first blade 400a and the second blade 400b may be disposed at a distance from the inner surface of the hopper 100 so that the cutting edge does not contact the inner surface of the hopper 100.

[0068] The radius L1 of the first blade can be formed to correspond to the magnitude of the distance in the third direction (Z direction) from the drive shaft 200 to the upper part of the discharge port O. Therefore, the first blade 400a can agitate the powder P laminated on the upper part of the discharge port O. On the contrary, the radius L2 of the second blade can be formed to correspond to the magnitude of the distance in the third direction (Z direction) from the drive shaft 200 to which the second blade 400b is connected to the inclined part. Therefore, the second blade 400b can agitate the powder P near the inclined part.

[0069] In an embodiment of the present utility model, the discharge port O can be arranged at the lower part of the inclined part. Therefore, the radius L1 of the first blade can be larger than the radius L2 of the second blade. Specifically, the radius L1 of the first blade can be 1.5 times or more of the radius L2 of the second blade, and preferably, it can be formed to have a size of 2 times or more.

[0070] In an embodiment of the present utility model, the spiral blade 400 can further include a third blade 400c arranged between the first blade 400a and the second blade 400b. The radius L3 of the third blade can be smaller than the radius L1 of the first blade and larger than the radius L2 of the second blade. Refer to Figure 4 , in addition to the third blade 400c, the spiral blade 400 can further include a plurality of blades arranged between the first blade 400a and the second blade 400b. The plurality of blades can be respectively formed with different radii to correspond to the lower surface 100b of the hopper. For example, since the lower surface 100b of the hopper includes an inclined part, the radii of the plurality of blades can gradually increase and then decrease along the first direction (X direction) to correspond to the inclined part.

[0071] Next, refer to Figure 5 to illustrate a modified example 400' of the spiral blade. Figure 5 The illustrated modified example 400' of the spiral blade can be arranged in Figure 1 and Figure 2 the powder discharging device 10 for secondary batteries shown.

[0072] Refer to Figure 1 , Figure 2 and Figure 5 , similar to the aforementioned spiral blade 400 through Figures 1 to 4 , the modified example of the spiral blade can include a first blade 400a and a second blade 400b with different radii. Specifically, the radius L1 of the first blade can be larger than the radius L2 of the second blade.

[0073] The spiral blade 400' may include a plurality of first blades 400a and a plurality of second blades 400b. For example, a plurality of first blades 400a may be arranged at a position opposite to the discharge port O, and a plurality of second blades 400b may be arranged at at least any one of both ends of the spiral blade 400' in the first direction (X direction). That is, the plurality of first blades 400a may be arranged between the second blades 400b.

[0074] The plurality of first blades 400a are arranged opposite to the discharge port O, and can mainly stir the powder P laminated on the part opposite to the discharge port O in the third direction (Z direction). The plurality of first blades 400a may be appropriately arranged corresponding to the size of the discharge port O.

[0075] In the existing powder discharging device for secondary batteries, powder is laminated on the part of the hopper opposite to the discharge port, and the phenomenon of powder agglomeration occurs. When the powder agglomerates, problems such as the powder cannot be smoothly discharged from the discharge port, and the speed of the powder being fed into the mixing device becomes slow or the powder cannot be normally fed into the powder mixing device occur.

[0076] However, according to an embodiment of the present invention, the powder P can move downward along the inclined part to the hopper 100 and be laminated at the discharge port O, and the spiral blades 400, 400' can rotate so that the powder P does not agglomerate, so that the powder P cannot be laminated at the discharge port O. In addition, the spiral blades 400, 400' including a plurality of blades with different radii corresponding to the size of the hopper 100 can stir the powder P accommodated in the accommodation space S of the hopper 100 as a whole. Therefore, the powder P laminated near the discharge port O can be smoothly discharged.

[0077] Through Figure 4 And Figure 5 The spiral blades 400, 400' have been described, but the shape of the spiral blades 400, 400' is not limited to Figure 4 And Figure 5 The shape shown. For example, various changes can be made to the number of blades, the arrangement method of the blades, etc.

[0078] Figure 6 FIG. is a perspective view of a powder discharging device for secondary batteries according to another embodiment of the present invention. Figure 7 Regarding Figure 6 The explanatory diagram of the spiral component shown.

[0079] Figure 6 In the structure of the powder discharging device 20 for secondary batteries shown in, a part of it may be the same as Figure 1 The powder discharging device 10 for secondary batteries shown in. The powder discharging device 20 for secondary batteries according to another embodiment of the present invention may include a plurality of screw components 500 instead of Figure 1The spiral blade 400 shown.

[0080] See Figure 6 and Figure 7 , a plurality of spiral members 500 can be configured to be connected to the circumferential surface of the drive shaft 200, and can be in a shape extending outward in the radial direction of the drive shaft 200. As an example, the plurality of spiral members 500 can extend in the second direction (Y direction), but are not limited thereto. For example, the plurality of spiral members 500 can extend in different directions respectively, and various changes can be made to the formation manner of the spiral members 500.

[0081] The plurality of spiral members 500 can rotate clockwise or counterclockwise with the drive shaft 200 as a reference. The plurality of spiral members 500 can stir the powder to be disposed inside the hopper 100 during rotation with the first axis (X axis) as a reference.

[0082] Flange portions 510 can be formed at each end of the plurality of spiral members 500. The flange portions 510 can widen the cross-sectional area of one end of the spiral members 500. Therefore, the flange portions 510 can enable the powder P farther from the drive shaft 200 to be well stirred when the spiral members 500 rotate. As an example, the flange portions 510 have a shape extending in the first direction (X direction) and can be formed parallel to the drive shaft 200.

[0083] The plurality of spiral members 500 can include a first spiral member 500a formed at a position opposite to the discharge port O and a second spiral member 500b disposed at at least any one of the two ends in the first direction (X direction) of the plurality of spiral members 500. However, it is not limited thereto, and the plurality of spiral members 500 can also only include the first spiral member 500a formed at a position opposite to the discharge port O. Therefore, at least a part of the plurality of spiral members 500 can be disposed at a position opposite to the discharge port O.

[0084] The discharge port O can be configured to be lower than the inclined portion, so the length H1 of the first spiral member can be formed longer than the length H2 of the second spiral member. Therefore, the first spiral member 500a can stir the powder located above the discharge port O as a whole.

[0085] A third spiral member can be disposed between the first spiral member 500a and the second spiral member 500b. The length of the third spiral member can be less than the length H1 of the first spiral member and greater than the length H2 of the second spiral member. See Figure 6 and Figure 7, a plurality of screw members may be included between the first screw member 500a and the second screw member 500b. The lengths of the plurality of screw members 500 may be formed differently so as to correspond to the lower surface 100b of the hopper. For example, since the lower surface 100b of the hopper includes an inclined portion, the lengths of the plurality of screw members may be respectively formed to correspond to the inclined portion.

[0086] For the hopper 100, the drive shaft 200, the drive motor 300, the vibration unit 600, and the valve 700, the above description will be replaced.

[0087] The above has described in detail a plurality of embodiments of the present invention, but the scope of rights of the present invention is not limited thereto, and various modifications and variations can be made within the scope not exceeding the technical idea of the present invention described in the specification, which is obvious to those of ordinary skill in the art. And, some components in the foregoing embodiments may be deleted for implementation, and each embodiment may also be implemented in combination with each other.

Claims

1. A powder discharge device for a secondary battery, characterized in that: include: A hopper having a holding space for holding powder and a discharge port for discharging the powder; A drive shaft, at least a portion of which is disposed inside the hopper and has a shape extending along a first direction; A driving motor connected to the driving shaft to rotate the driving shaft; as well as A spiral blade connected to the circumferential surface of the driving shaft, The spiral blade includes a first blade and a second blade having different radii.

2. The powder discharge device for secondary batteries according to claim 1, characterized in that: The first blade is arranged at a position opposite to the discharge port. The second blade is disposed at least one of both ends of the spiral blade in the first direction.

3. The powder discharge device for secondary battery according to claim 2, characterized in that: The spiral blade is arranged to be spaced apart from the inner surface of the hopper so that the blade portion does not contact the inner surface of the hopper.

4. The powder discharge device for secondary battery according to claim 2, characterized in that: The radius of the first blade is greater than the radius of the second blade.

5. The powder discharge device for secondary battery according to claim 4, characterized in that: The spiral blade further includes a third blade disposed between the first blade and the second blade.

6. The powder discharge device for secondary battery according to claim 5, characterized in that: A radius of the third blade is smaller than a radius of the first blade and larger than a radius of the second blade.

7. The powder discharge device for secondary battery according to claim 2, characterized in that: A plurality of the first blades and a plurality of the second blades are configured, The radius of the first blade is greater than the radius of the second blade.

8. The powder discharge device for secondary battery according to claim 7, characterized in that: The first blades are arranged between the second blades.

9. The powder discharge device for secondary battery according to claim 1, characterized in that: The lower surface of the hopper is formed with an inclined portion. The discharge port is formed at a lower portion of the inclined portion.

10. The powder discharge device for secondary battery according to claim 9, characterized in that: The drive shaft is in contact with the inclined portion.

11. The powder discharge device for secondary battery according to claim 10, characterized in that: The radius of the first blade is more than twice the radius of the second blade.

12. The powder discharge device for secondary battery according to claim 9, characterized in that: Also includes: The vibration unit contacts the inclined portion and transmits vibration to the hopper.

13. The powder discharge device for secondary battery according to claim 1, characterized in that: The discharge port is connected to a switchable valve.

14. A powder discharge device for a secondary battery, characterized in that: include: A hopper having a holding space for holding powder and a discharge port for discharging the powder, the discharge port being formed at the lower end; A drive shaft, at least a portion of which is disposed inside the hopper and has a shape extending along a first direction; A driving motor connected to the driving shaft to rotate the driving shaft; as well as A plurality of spiral components are connected to the circumferential surface of the driving shaft and extend outward along the radial direction of the driving shaft. At least a part of the plurality of spiral members is arranged at a position facing the discharge port.

15. The powder discharge device for secondary battery according to claim 14, characterized in that: The plurality of spiral members each include a flange portion formed at one end.

16. The powder discharge device for secondary battery according to claim 15, characterized in that: The flange portion has a shape extending in the first direction.

17. The powder discharge device for secondary battery according to claim 14, characterized in that: The plurality of spiral components include a first spiral component disposed at a position opposite to the discharge port and a second spiral component disposed at at least one of both ends of the plurality of spiral components in the first direction. The length of the first spiral component is longer than the length of the second spiral component.

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