Electrode slurry storage device for secondary battery

Abstract

Provided is an electrode slurry storage device for a secondary battery, comprising: a slurry storage tank for storing an electrode slurry for a secondary battery; the degassing blade is accommodated in the slurry storage tank; and a negative pressure pump connected to the slurry storage tank and changing the inside of the slurry storage tank into a negative pressure state, the degassing blade physically striking air bubbles at the upper part of the slurry storage tank.

Description

Technical Field

[0001] The present disclosure relates to an electrode slurry storage device for a secondary battery, which stores electrode slurry for a secondary battery and is capable of removing bubbles in the slurry. Background Art

[0002] Generally, unlike primary batteries, secondary batteries can be charged and discharged, and thus can be applied to various fields such as digital cameras, mobile phones, notebook computers, hybrid vehicles, and electric vehicles.

[0003] On the other hand, in order to manufacture an electrode for a secondary battery, it is necessary to go through a process of coating an electrode slurry on a current collector and drying it. The electrode slurry is prepared by mixing an electrode active material, a binder, and a solvent, and bubbles are contained in the electrode slurry during the mixing process.

[0004] If the electrode slurry contains bubbles, the bubbles in the electrode slurry are discharged to the outside during the process of applying the electrode slurry on the collector and drying it, resulting in the formation of gas release holes on the electrode, thereby causing electrode failure.

[0005] In order to prevent electrode failure, a so-called degassing process is required to remove bubbles in the electrode slurry. Summary of the invention

[0006] 1. Technical issues to be resolved

[0007] According to one aspect of the present disclosure, there may be provided an electrode slurry storage device for a secondary battery that minimizes bubbles remaining in electrode slurry for a secondary battery.

[0008] According to another aspect of the present disclosure, a secondary battery electrode slurry storage device may be provided, which increases fluidity of bubbles in the secondary battery electrode slurry during degassing of the electrode slurry.

[0009] (II) Technical solution

[0010] According to one embodiment of the present disclosure, there is provided an electrode slurry storage device for a secondary battery, comprising: a slurry storage tank for accommodating electrode slurry for a secondary battery; a degassing blade disposed inside the slurry storage tank; a rotating unit for providing a driving force for rotating the degassing blade; and a negative pressure pump connected to the inside of the slurry storage tank and causing the inside of the slurry storage tank to become a negative pressure state, wherein the degassing blade physically hits the bubbles in the slurry storage tank.

[0011] The electrode slurry storage device for a secondary battery according to one embodiment may further include: a rotating blade to stir the slurry contained inside the slurry storage tank.

[0012] In one embodiment, the rotating unit may drive the rotating blade and the degassing blade to rotate together.

[0013] In one embodiment, the degassing blade may include a striking member, the degassing blade may be disposed at an upper portion of the inner space of the slurry storage tank, and the striking member may be disposed at a lower side of the degassing blade.

[0014] In one embodiment, the striking member may be provided in a form of protruding from the degassing blade toward a lower portion of the slurry storage tank.

[0015] In one embodiment, the striking member may form a tapered portion having a narrow width in a lower direction.

[0016] The electrode slurry storage device for a secondary battery according to one embodiment may further include a supporting unit connected to the rotating unit to support the rotating unit.

[0017] In one embodiment, the rotating unit may drive the degassing blade and the supporting unit to rotate together.

[0018] In one embodiment, the supporting unit may include: a supporting shaft connected to one end of the rotating unit; and a stirring blade connected to the supporting shaft and stirring the slurry contained in the slurry storage tank.

[0019] In one embodiment, the rotating blades may include spiral blades and linear blades having a spiral shape.

[0020] In one embodiment, the rotating unit may include a shaft, one end of the linear blade may be connected to the spiral blade, and the other end of the linear blade may be connected to the shaft.

[0021] In one embodiment, the linear blade may be disposed on upper and lower sides of the shaft, and may be disposed on the shaft in a state of being inclined with respect to a rotation direction of the linear blade.

[0022] In one embodiment, the spiral blade may be disposed along an inner wall of the slurry storage tank, and the slurry contained in the slurry storage tank may move along the inner wall.

[0023] In one embodiment, a plurality of spiral blades may be provided.

[0024] In one embodiment, the negative pressure pump may be disposed at an upper end of the slurry storage tank.

[0025] In one embodiment, the rotating unit may include a shaft and a driving motor, the driving motor may be connected to the shaft and may be disposed at one end of the slurry storage device, and the degassing blade may be connected to the shaft.

[0026] In addition, according to one embodiment of the present disclosure, a secondary battery electrode slurry storage device can be provided, which includes: a slurry storage tank for containing electrode slurry for secondary batteries; a rotating blade for stirring the slurry contained inside the slurry storage tank; a rotating unit for providing a driving force to rotate the rotating blade; and a negative pressure pump connected to the inside of the slurry storage tank and causing the inside of the slurry storage tank to become a negative pressure state.

[0027] According to one embodiment, the rotating blades may include spiral blades and linear blades having a spiral shape.

[0028] According to one embodiment, the rotating unit may include a shaft, one end of the linear blade may be connected to the spiral blade, and the other end of the linear blade may be connected to the shaft.

[0029] According to one embodiment, the linear blade may be provided on both upper and lower sides of the shaft, and may be provided on the shaft in a state of being inclined with respect to a rotation direction of the linear blade.

[0030] According to one embodiment, the spiral blade may be disposed along an inner wall of the slurry storage tank so that the slurry contained in the slurry storage tank moves along the inner wall.

[0031] According to one embodiment, a plurality of spiral blades may be provided.

[0032] According to one embodiment, the negative pressure pump may be disposed at an upper end of the slurry storage tank.

[0033] According to one embodiment, the invention may further include: a supporting unit connected to the rotating unit to support the rotating unit.

[0034] According to one embodiment, the rotating unit may drive the rotating blades and the supporting unit to rotate together.

[0035] According to one embodiment, the supporting unit may include: a supporting shaft connected to one end of the rotating unit; and a stirring blade connected to the supporting shaft and stirring the slurry contained in the slurry storage tank.

[0036] (III) Beneficial effects

[0037] According to one embodiment of the present disclosure, an electrode slurry storage device for a secondary battery may be provided, which may minimize bubbles remaining inside the slurry.

[0038] According to one embodiment of the present disclosure, the fluidity of bubbles in the electrode slurry for a secondary battery may be increased during the degassing process of the electrode slurry. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a front view showing the appearance of the slurry storage device.

[0040] Figure 2 The slurry storage device showing a state where no slurry is contained is shown along Figure 1 A cross-sectional view taken along line I-I'.

[0041] Figure 3 It is a front view showing the rotating unit, the supporting unit, the rotating blades, and the degassing blades.

[0042] Figure 4 is a perspective view showing a rotating unit, a supporting unit, and a rotating blade.

[0043] Figure 5 is a perspective view showing a rotating unit, a supporting unit, rotating blades, and a slurry storage tank containing slurry.

[0044] Figure 6 It is a perspective view of a slurry storage tank including degassing blades, shafts and rotating blades.

[0045] Figure 7 This is an exploded perspective view of the degassing blades. DETAILED DESCRIPTION

[0046] Before describing the present disclosure in detail, it should be noted that the terms or words used in the present specification and claims described below should not be interpreted as limited to the general meaning or dictionary meaning, but should be interpreted as the meaning and concept that conforms to the technical idea of ​​the present disclosure based on the principle that the inventor can appropriately define the concept of the term in order to explain his own invention in the best way. Therefore, the embodiments described in this specification and the configurations shown in the drawings are only the most preferred embodiments of the present disclosure and do not represent the entire technical idea of ​​the present disclosure. Therefore, it should be understood that various equivalents and modifications that can replace them may be available at the time of submitting this application.

[0047] Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. At this time, the same components in the drawings are represented by the same reference numerals as much as possible. In addition, detailed descriptions of known functions and configurations that may obscure the subject matter of the present disclosure will be omitted. For the same reason, some components in the drawings may be exaggerated, omitted or schematically shown, and the size of each component does not fully reflect the actual size.

[0048] One embodiment of the present disclosure relates to an electrode slurry storage device for a secondary battery. Hereinafter, the storage device according to the present disclosure will be described in detail with reference to the accompanying drawings.

[0049] Figure 1 is a front view showing the appearance of the slurry storage device, Figure 2 The slurry storage device is shown in a state where no slurry is contained. Figure 1 A cross-sectional view taken along line I-I'.

[0050] Reference Figure 1 and Figure 2 The electrode slurry storage device for a secondary battery according to one embodiment of the present disclosure may include a slurry storage tank 100 , a rotating unit 220 , a degassing blade 500 , a rotating blade 400 , and a negative pressure pump 600 .

[0051] The slurry storage tank 100 may protect the slurry from the external environment and store the slurry in an internal space.

[0052] The interior of the slurry storage tank 100 may accommodate a rotating unit 200. The rotating unit 200 may provide a driving force so that the support unit 300, the degassing blade 500, and the rotating blade 400 inside the slurry storage tank 100 can rotate. For example, the rotating unit 200 may drive the degassing blade 500 and the rotating blade 400 to rotate together. The rotating unit 200 may include a shaft 210 and a drive motor 220. The shaft 210 may be connected to the drive motor 220 and may receive a driving force from the drive motor 220 and rotate. The shaft 210 may be disposed at the center of the slurry storage tank 100 in the up-down direction.

[0053] A driving motor 220 may be disposed outside the slurry storage tank 100, and the driving motor 220 may transmit driving force to the shaft 210 disposed inside the slurry storage tank 100. For example, the driving motor 220 may be disposed at one end (upper portion) of the slurry storage tank 100.

[0054] A support unit 300 connected to the shaft 210 may be disposed at a lower portion of the inner space of the slurry storage tank 100. The support unit 300 may include a support shaft 310 connected to the shaft 210 and a stirring blade 320 connected to the support shaft 310.

[0055] The support shaft 310 may be connected to the shaft 210 and may rotate together with the rotation of the shaft 210. Therefore, the stirring blade 320 connected to the support shaft 310 may also rotate together with the shaft 210 as the shaft 210 rotates.

[0056] The support shaft 310 and the stirring blade 320 may be disposed at the lower portion of the slurry storage tank 100. As an example, the support shaft 310 may be disposed at a position where the shaft 210 extends, and the lower portion of the support shaft 310 may contact the lower end of the inner space of the slurry storage tank 100. In addition, the stirring blade 320 may be installed at the lower portion of the inner space of the slurry storage tank 100. The stirring blade 320 may be disposed at the lower portion of the rotating blade 400. The stirring blade 320 may be rotated by the driving of the rotating unit 200, so that the slurry contained in the slurry storage tank 100 can be stirred. Since the stirring blade 320 may be disposed at the lower end of the slurry storage tank 100, the slurry at the lower portion of the slurry storage tank 100 may be moved to the upper portion of the slurry storage tank 100 while being stirred.

[0057] A degassing blade 500 may be provided inside the slurry storage tank 100. The degassing blade 500 may physically strike the bubbles in the slurry to break the bubbles. The degassing blade 500 may be connected to the shaft 210 and rotate, but is not limited thereto and may also be accommodated inside the slurry storage device through a separate fastening component.

[0058] A rotating blade 400 may be disposed inside the slurry storage tank 100. The rotating blade 400 may stir bubbles in the slurry.

[0059] The rotating blade 400 may include a linear blade 410 and a spiral blade 420. The linear blade 410 may be connected to the shaft 210 and may rotate together with the shaft 210 as the shaft 210 rotates. The spiral blade 420 may have a spiral shape and may be disposed inside the slurry storage device and may be connected to the linear blade 410. Therefore, when the linear blade 410 rotates, the spiral blade 420 may also rotate together, and when the spiral blade 420 rotates, the slurry inside the slurry storage tank 100 may be stirred.

[0060] The slurry storage tank 100 may be provided with a negative pressure pump 600. The negative pressure pump may be connected to the inside of the slurry storage tank 100 and may make the inside of the slurry storage tank 100 into a negative pressure state. The negative pressure pump may be a vacuum pump as long as it can reduce the internal pressure of the slurry storage device to form a pressure gradient.

[0061] When the internal pressure of the slurry storage tank 100 becomes a negative pressure state, the bubbles contained in the slurry of the slurry storage tank 100 can expand and the internal pressure of the bubbles can be reduced. Therefore, as the internal pressure of the bubbles decreases, when physically hit with the degassing blade 500, the bubbles can be effectively removed. In addition, the negative pressure pump 600 can be connected to the upper end of the slurry storage tank 100, and a pressure difference can be generated inside the slurry storage tank 100. Since the negative pressure pump 600 is connected to the upper part of the internal space of the slurry storage tank 100 and forms a negative pressure, when the pressure of the upper part of the internal space of the slurry storage tank 100 decreases, a pressure difference can be generated between the lower part and the upper part of the slurry storage tank 100. Therefore, the bubbles contained in the slurry can move from the lower part to the upper part of the slurry storage tank 100. Due to the effect of the rotating blade 400 to be described later and the negative pressure pump 600 connected to the upper end of the slurry storage tank 100, the bubbles in the slurry can be effectively moved to the upper part of the slurry storage tank 100.

[0062] Figure 3 1 is a front view showing the rotating unit 200 , the supporting unit 300 , the rotating blade 400 , and the degassing blade 500 .

[0063] Reference Figure 3 , the rotating unit 200 may include a shaft 210 and a driving motor 220, and the unit connected to the shaft 210 may rotate about the shaft 210. For example, the shaft 210 may receive a driving force from the driving motor 220 and rotate in a clockwise direction or a counterclockwise direction about the shaft 210. The supporting unit 300, the rotating blade 400, and the degassing blade 500 may be connected to the shaft 210.

[0064] The support unit 300 may be connected to the lower end of the shaft 210. For example, the support shaft 310 may be connected to the lower end of the shaft 210, and the stirring blade 320 may be connected to the support shaft 310. The stirring blade 320 may be provided on both sides of the support shaft 310 and rotate around the support shaft 310. Therefore, the slurry at the lower portion of the slurry storage tank 100 may be stirred.

[0065] The rotating blade 400 may include a linear blade 410 and a spiral blade 420 having a spiral shape.

[0066] Reference Figure 3 The spiral blade 420 may be connected to the linear blade 410 and may have a spiral shape rotating around the shaft 210. A plurality of spiral blades 420 may be provided, and each spiral blade 420 may be provided to have a spiral shape.

[0067] The linear blade 410 may be installed in plurality at positions including the upper and lower ends of the shaft, and may be configured to be connected to both ends of the spiral blade 420, respectively. Figure 3Although the linear blade 410 is connected to only both ends of the spiral blade 420 , the linear blade 410 may be connected to the middle of the spiral blade 420 .

[0068] One end of the linear blade 410 may be connected to the spiral blade 420, and the other end of the linear blade 410 may be connected to the shaft 210. The linear blade 410 may be connected to both sides of the shaft 210 vertically.

[0069] The degassing blade 500 may be located above the rotating blade 400 and may be connected to the shaft 210. The degassing blade 500 may be symmetrically arranged with respect to the shaft 210 and may include a striking member 510. The degassing blade 500 may rotate with respect to the shaft 210 and may fully strike the bubbles in the slurry moved to the upper part.

[0070] Figure 4 is a perspective view showing the rotating unit 200, the supporting unit 300, and the rotating blade 400, Figure 5 1 is a perspective view showing a rotating unit 200, a supporting unit 300, a rotating blade 400, and a slurry storage tank 100 containing slurry. Figure 4 and Figure 5 The illustrated embodiment may include degassing blades 500 , but the degassing blades 500 are omitted from the illustration to clearly illustrate the rotating blades 400 .

[0071] Reference Figure 5 The spiral blade 420 may have a form of winding along the inner wall from the lower part to the upper part of the slurry storage tank 100, so that a height difference may be generated at both ends of the spiral blade 420. The linear blade 410 may be connected to both ends of the spiral blade 420, so that a plurality of linear blades 410 may be arranged on the shaft 210 at different heights.

[0072] The spiral blade 420 may be disposed adjacent to the inner wall of the slurry storage tank 100, and may be disposed in a form wound along the inner wall from the lower portion to the upper portion of the slurry storage tank 100. The spiral blade 420 may be connected to the linear blade 410, and the linear blade 410 may be connected to the shaft 210, so that the spiral blade 420 may rotate together with the rotation of the shaft 210. When the spiral blade 420 rotates, the slurry contained inside the slurry storage tank 100 may be stirred in a manner that moves along the inner wall of the slurry storage tank 100. The slurry contained inside the slurry storage tank 100 may move to the upper portion or the lower portion of the slurry storage tank 100 according to the rotation direction of the shaft 210. That is, the rotation direction of the shaft 210 may be disposed so that the slurry moves upward along the spiral blade 420 to the upper portion of the slurry storage tank 100, so that the slurry may move to the upper portion. For example, if as Figure 5 The rotation direction of the shaft 210 is set as shown, and the contained slurry can be moved to the upper part of the slurry storage device.

[0073] Reference Figure 4 One end of the linear blade 410 may be connected to the shaft 210, and the other end may be connected to the rotating blade 400. The linear blade 410 may be provided on the shaft 210 in a state of being inclined with respect to the rotating direction of the linear blade 410.

[0074] The linear blade 410 may be disposed in a state of forming an acute angle with respect to a horizontal axis perpendicular to the shaft 210. In addition, the spiral blade 420 may be connected to the linear blade 410 in a direction in which the linear blade 410 is inclined. However, at the point where the linear blade 410 and the spiral blade 420 are connected, the angle formed by the horizontal axis and the linear blade 410 and the angle formed by the horizontal axis and the spiral blade 420 may be different.

[0075] That is, the linear blade 410 can be set on the shaft 210 in a state inclined relative to the horizontal axis. Since the linear blade 410 can rotate with the shaft 210 as the rotation axis, when the linear blade 410 is set in a tilted state, the contact area with the slurry is increased, making it easy to stir the slurry, and at the same time, the slurry can be easily moved to the upper part of the slurry storage tank 100.

[0076] Therefore, when the linear blade 410 and the spiral blade 420 connected to the shaft 210 rotate, the slurry contained in the slurry storage tank 100 can move in the direction in which the linear blade 410 is inclined. In addition, the slurry moved by the inclined linear blade 410 can move along the spiral blade 420 connected to the linear blade 410, and thus the slurry can move to the upper part of the slurry storage tank 100 along the spiral blade 420.

[0077] Figure 6 2 is a perspective view of a slurry storage tank 100 including a degassing blade 500 , a shaft 210 , and a rotary blade 400 .

[0078] Generally, bubbles in the slurry have a specific gravity difference with the slurry, and due to the specific gravity difference, the bubbles move to the upper part of the slurry tank 100. Therefore, the degassing blade 500 can be disposed at the upper part of the slurry tank 100, and can effectively remove the bubbles moved to the upper part.

[0079] In one embodiment of the present disclosure, Figure 6 As shown, the degassing blade 500 can be disposed on the upper part of the slurry storage tank 100 and can be disposed on the upper part of the rotating blade 400. As the rotating blade 400 rotates, the slurry in the slurry storage tank 100 is stirred, and the bubbles in the slurry move to the upper part of the slurry storage tank 100 due to the specific gravity difference with the slurry and the action of the rotating blade 400.

[0080] In the slurry storage tank 100, the slurry can be accommodated to a height lower than the position of the degassing blade 500, and the slurry can continue to be stirred by the rotating blade 400. Figure 6 Although not shown, as described above, the negative pressure pump 600 disposed at the upper portion of the storage tank can generate a pressure gradient, and the bubbles in the slurry can move to the upper portion of the slurry storage tank 100. The degassing blade 500 can physically hit the moving bubbles to remove the bubbles.

[0081] The degassing blade 500 may include a striking member 510 for physically striking bubbles. The degassing blade 500 may be disposed at the upper portion of the slurry storage device 100, and thus the striking member 510 may be disposed at the lower end of the body of the degassing blade 500 to strike the slurry moving to the upper portion in the internal space of the slurry storage device 100. As an example, the striking member may be disposed in a form protruding from the degassing blade 500 toward the lower portion of the slurry storage device 100, and the striking member 510 may protrude and form a taper, thereby having a form in which its cross-sectional area decreases along the lower portion of the slurry storage device 100. Therefore, the cross-sectional area of ​​one end of the striking member 510 may be reduced, thereby easily bursting bubbles.

[0082] The striking component 510 may have a sharp shape at the end or side to facilitate the destruction of bubbles, but is not limited thereto. For example, the striking component 510 may have a shape such as a blade, an awl, etc., but various changes may be made as long as it can apply pressure to the bubbles to physically remove the bubbles. In one embodiment of the present disclosure, the striking component 510 of the degassing blade 500 may be a blade with a sharp end to apply a large pressure to the bubbles by reducing the contact surface.

[0083] Since the striking member 510 needs to continuously apply a pressure greater than the internal pressure of the bubble, it is necessary to manage the striking member 510 to prevent the striking member 510 from becoming blunt. In one embodiment of the present disclosure, the degassing blade 500 may include a replacement member 520 to facilitate replacement of the degassing blade 500.

[0084] Figure 7 It is an exploded perspective view of the degassing blade 500 .

[0085] like Figure 7 As shown, the degassing blade 500 may include a fastening member 530 and may be coupled to the shaft 210 by the fastening member 530. Therefore, the shaft 210, the rotating blade 400, and the degassing blade 500 may rotate together. As an example, the fastening member 530 may be a bolt, a nut, a pin, etc., but is not limited thereto, as long as the degassing blade 500 can be coupled to the shaft 210 and rotate together with the shaft 210.

[0086] However, the degassing blade 500 may not include the fastening member 530 but may be accommodated inside the slurry storage device 100 through a separate connection member and may not be connected to the shaft. In this case, the degassing blade 500 may not rotate within the slurry storage tank 100.

[0087] Although the embodiments of the present disclosure are described in detail above, the scope of rights of the present disclosure is not limited thereto, and it is obvious to those skilled in the art that various modifications and variations can be made without departing from the technical idea of ​​the present disclosure.

[0088] For example, the present invention may be implemented by deleting some components in the above embodiments, or by combining various embodiments.

Claims

1. An electrode slurry storage device for a secondary battery, comprising: A slurry storage tank, which contains electrode slurry for secondary batteries; Degassing blades are arranged inside the slurry storage tank; A rotating unit, providing a driving force for rotating the degassing blades; as well as A negative pressure pump is connected to the inside of the slurry storage tank and makes the inside of the slurry storage tank into a negative pressure state, The deaerator blades physically strike the air bubbles in the slurry storage tank.

2. The electrode slurry storage device for secondary batteries according to claim 1, further comprising: The rotating blades stir the slurry contained in the slurry storage tank, The rotating unit drives the rotating blade and the degassing blade to rotate together.

3. The electrode slurry storage device for secondary batteries according to claim 2, wherein: The degassing blade is disposed on an upper portion of the rotating blade.

4. The electrode slurry storage device for secondary batteries according to claim 1, wherein: The degassing blade includes a striking component, The degassing blade is arranged at the upper part of the inner space of the slurry storage tank. The striking member is provided on the lower side of the degassing blade.

5. The electrode slurry storage device for secondary batteries according to claim 4, wherein: The striking member is provided in a form protruding from the degassing blade toward a lower portion of the slurry tank.

6. The electrode slurry storage device for secondary batteries according to claim 5, wherein: The striking member forms a tapered portion having a narrow width in a downward direction.

7. The electrode slurry storage device for secondary batteries according to claim 1, further comprising: a supporting unit connected to the rotating unit to support the rotating unit, The rotating unit drives the degassing blade and the supporting unit to rotate together.

8. The electrode slurry storage device for secondary batteries according to claim 7, wherein: The support unit comprises: a support shaft connected to one end of the rotating unit; and A stirring blade is connected to the supporting shaft and stirs the slurry contained in the slurry storage tank.

9. The electrode slurry storage device for secondary batteries according to claim 1, wherein: The negative pressure pump is arranged at the upper end of the slurry storage tank.

10. The electrode slurry storage device for secondary batteries according to claim 1, wherein: The rotating unit includes a shaft and a driving motor, The driving motor is connected to the shaft and is arranged at one end of the slurry storage device. The degassing blade is connected to the shaft.

11. An electrode slurry storage device for a secondary battery, comprising: A slurry storage tank, which contains electrode slurry for secondary batteries; Rotating blades to stir the slurry contained in the slurry storage tank; A rotating unit, providing a driving force for rotating the rotating blades; as well as A negative pressure pump is connected to the interior of the slurry storage tank and causes the interior of the slurry storage tank to be in a negative pressure state.

12. The electrode slurry storage device for secondary batteries according to claim 11, wherein: The rotating blades include spiral blades and linear blades in a spiral shape.

13. The electrode slurry storage device for secondary batteries according to claim 12, wherein: The rotating unit comprises a shaft, One end of the linear blade is connected to the spiral blade, and the other end of the linear blade is connected to the shaft.

14. The electrode slurry storage device for secondary batteries according to claim 13, wherein: The linear blade is provided on both upper and lower sides of the shaft, and is provided on the shaft in a state of being inclined with respect to a rotation direction of the linear blade.

15. The electrode slurry storage device for secondary batteries according to claim 12, wherein: The spiral blade is disposed along an inner wall of the slurry storage tank so that the slurry contained in the slurry storage tank moves along the inner wall.

16. The electrode slurry storage device for secondary batteries according to claim 12, wherein: The spiral blades are provided in plurality.

17. The electrode slurry storage device for secondary batteries according to claim 11, wherein: The negative pressure pump is arranged at the upper end of the slurry storage tank.

18. The electrode slurry storage device for secondary batteries according to claim 11, further comprising: The supporting unit is connected to the rotating unit to support the rotating unit.

19. The electrode slurry storage device for secondary batteries according to claim 18, wherein: The rotating unit drives the rotating blade and the supporting unit to rotate together.

20. The electrode slurry storage device for secondary batteries according to claim 18, wherein: The support unit comprises: a support shaft connected to one end of the rotating unit; and A stirring blade is connected to the supporting shaft and stirs the slurry contained in the slurry storage tank.

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