Slot die apparatus

Abstract

The present invention relates to a slot die apparatus for coating by discharging injected slurry. The slot die apparatus comprises: a die block including a first die having a protruding die lip and a second die coupled to the first die; and a shim assembly interposed between the first die and the second die and including a discharge port through which the slurry is discharged, wherein the shim assembly comprises: a coupling part coupled to the second die; and a shim part protruding from one surface of the coupling part in a shape in which one side is open, and the shim assembly has a discharge port formed in an open portion of the shim part positioned between the first die and the coupling part.

Description

slot die device

[0001] The present invention relates to a slot die device, and more particularly, to a slot die device designed to facilitate lip replacement.

[0002] This application claims the benefit of priority from Republic of Korea Patent Application No. 10-2024-0041769, filed March 27, 2024, the entire contents of which are incorporated herein by reference.

[0003]

[0004] Secondary batteries that can be recharged are attracting attention as power sources for devices that require high output and large capacity, including electric vehicles, hybrid electric vehicles, and plug-in hybrid electric vehicles, which are being proposed as a solution to air pollution caused by existing gasoline and diesel vehicles that use fossil fuels.

[0005] In terms of battery shape, there is a high demand for square secondary batteries and pouch-type secondary batteries that can be applied to products such as mobile phones due to their thin thickness. In terms of materials, there is a high demand for lithium secondary batteries such as lithium-ion batteries and lithium-ion polymer batteries that have advantages such as high energy density, discharge voltage, and output stability.

[0006] Secondary batteries have a structure in which an electrode assembly consisting of electrodes and a separator and an electrolyte are housed together in a battery case.

[0007] In general, electrodes are manufactured by applying a slurry containing an active material onto a sheet-shaped current collector, and a slot die device is most commonly used for applying the slurry.

[0008] Fig. 1 is a perspective view of a conventional slot die (10) device, and Fig. 2 simply shows a process of coating slurry on a sheet (50) using the slot die (10) device of Fig. 1.

[0009] In general, the slot die (10) device forms a slit (40) by interposing a die core (30) between a pair of dies (10) as shown in FIG. 1, and guides and discharges the slurry passing through the slit (40) by a die lip (20) protruding from the front end of the die (10) as shown in FIG. 2, thereby coating the slurry.

[0010] However, since the slurry handled in the secondary battery manufacturing process is a fluid with high viscosity, wear may occur in the die lip (20) portion due to long-term use.

[0011] In the past, there was the inconvenience of having to separate the die (10) itself in order to polish the worn die lip (20). Of course, in order to resolve this inconvenience, a slot die (10) device having a structure that allows only the die lip (20) to be separated was developed, but there was a problem that complete fastening was difficult due to the straightness processing tolerance between the die (10) and the die lip (20).

[0012]

[0013] (Prior art document) Korean Patent No. 10-2615168

[0014]

[0015] Accordingly, the present invention was created to solve the above problems, and the purpose of the present invention is to provide a slot die device having a structure in which the die lip portion can be easily separated and replaced when worn.

[0016] Other objects and advantages of the present invention can be understood through the following description and will be more clearly understood through the embodiments of the present invention. Furthermore, it will be readily apparent that the objects and advantages of the present invention can be realized by the means and combinations thereof set forth in the claims.

[0017] According to the present invention, a slot die device is provided for coating by discharging an injected slurry.

[0018] The slot die device comprises a die block including a first die having a protruding die lip and a second die coupled to the first die; and a shim assembly interposed between the first die and the second die and including a discharge port through which slurry is discharged; wherein the shim assembly comprises a coupling portion coupled to the second die; and a core portion protruding from one surface of the coupling portion in a shape in which one side is open; wherein the shim assembly is characterized in that the discharge port is formed in the open portion of the core portion located between the first die and the coupling portion.

[0019] The die block further includes a manifold in which slurry is stored, and the slurry can be discharged by moving to the core assembly through the manifold.

[0020] The above-mentioned joint may have a square frame shape with an open center corresponding to the above-mentioned manifold shape.

[0021] The above manifold can be formed in at least one of the first die and the second die.

[0022] The tip position of the above-mentioned joint may be aligned with the tip position of the die lip included in the first die.

[0023] The tip of the above-mentioned joint may protrude further than the tip of the second die.

[0024] It may be composed of a support portion coupled to the rear end of the above-mentioned joint and formed to extend along the longitudinal direction of the above-mentioned joint; and a pair of guide portions coupled to both ends of the above-mentioned joint and formed to extend along the width direction of the above-mentioned joint to form a discharge port.

[0025] The width and length of the above discharge port may correspond to the separation distance of the above guide portion.

[0026] The above-mentioned core may further include at least one separating portion that is coupled to the support portion so as to be positioned between the pair of guide portions and extends along the width direction of the coupling portion.

[0027] The above-mentioned core may further include an extension portion that is coupled to an end of the guide portion and extends along the length of the coupling portion.

[0028] The width and length of the above discharge port may correspond to the separation distance of the above extension.

[0029] The above core assembly may be configured to be detachable from the die block.

[0030] According to the slot die device of the present invention, when the die lip is worn, the worn die lip can be efficiently separated.

[0031] Figure 1 is a perspective view of a conventional slot die device.

[0032] Figure 2 is a schematic diagram simply showing the process of coating slurry with the slot die device of Figure 1.

[0033] FIG. 3 is a perspective view of a slot die device according to the first embodiment of the present invention.

[0034] Fig. 4 is an exploded perspective view of the slot die device of Fig. 3.

[0035] Fig. 5 is an exploded perspective view showing a modified example of the slot die device of Fig. 3.

[0036] FIG. 6 is a perspective view, a plan view, and a front view of a core assembly included in the slot die device of FIG. 3.

[0037] Fig. 7 is a perspective view, a plan view, and a front view showing a modified example of the core assembly of Fig. 6.

[0038] FIG. 8 is a perspective view, a plan view, and a front view of a core assembly included in a slot die device according to a second embodiment of the present invention.

[0039] Fig. 9 is a perspective view, a plan view, and a front view showing a modified example of the core assembly of Fig. 8.

[0040] FIG. 10 is a perspective view, a plan view, and a front view of a core assembly included in a slot die device according to a third embodiment of the present invention.

[0041] Fig. 11 is a perspective view, a plan view, and a front view showing a modified example of the core assembly of Fig. 10.

[0042] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, it should be noted that the terms and words used in this specification and claims should not be construed as limited to their conventional or dictionary meanings. Based on the principle that the inventor can appropriately define the concept of a term to best explain his or her invention, they should be construed as meanings and concepts consistent with the technical spirit of the present invention.

[0043] Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are only the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention, and it should be understood that there may be various equivalents and modified examples that can replace them at the time of filing this application.

[0044] In addition, when describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description is omitted.

[0045] Since the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art, the shapes and sizes of components in the drawings may be exaggerated, omitted, or schematically illustrated for clearer explanation. Accordingly, the sizes and proportions of each component do not fully reflect the actual sizes or proportions.

[0046]

[0047] The present invention relates to a slot die device, and more particularly, to a slot die device designed to facilitate lip replacement.

[0048] FIGS. 3 to 6 relate to a slot die device according to a first embodiment of the present invention, FIGS. 7 to 9 relate to a slot die device according to a second embodiment of the present invention, and FIGS. 10 to 11 relate to a slot die device according to a third embodiment of the present invention.

[0049] Hereinafter, specific embodiments of the slot die device of the present invention will be described in detail with reference to the attached drawings. Note that the directions of front, back, up, down, left, and right used to designate relative positions in the following description are intended to aid understanding of the invention, and unless otherwise specified, the directions depicted in the drawings are taken as a reference.

[0050] Here, the longitudinal direction of a configuration is defined as the direction corresponding to the plane having the longest length of the configuration depicted in the drawing based on the horizontal direction, and the width direction of a configuration is defined as the direction orthogonal to the longitudinal direction based on the horizontal direction.

[0051]

[0052] (First embodiment)

[0053] FIG. 3 is a perspective view of a slot die device according to a first embodiment of the present invention, and FIG. 4 is an exploded perspective view of the slot die device of FIG. 3.

[0054] The slot die device of the present invention includes a die block including a pair of dies and a core assembly (200) as shown in FIGS. 3 and 4.

[0055] The above die block specifically includes a first die (110) and a second die (120) coupled to the first die (110).

[0056] The above first die (110) has a shape in which a die lip (111) protrudes from the tip.

[0057] The above die lip (111) is formed to extend from the tip of the first die (110) along the length direction of the first die (110).

[0058] The die block of the present invention may further include a manifold (M) in which slurry is stored.

[0059] In some embodiments, the manifold (M) may be formed in the second die (120) as illustrated in FIG. 4.

[0060] The slurry supplied from the outside is introduced into the die block, and preferably, the inlet (not shown) through which the slurry is introduced is formed at a position connected to the manifold (M). Accordingly, the slurry is introduced into the second die (120) and temporarily stored in the manifold (M).

[0061]

[0062] *Figure 5 is an exploded perspective view showing a modified example of the slot die device of Figure 3.

[0063] In some other embodiments, the manifold (M) may be formed in the first die (110), as illustrated in FIG. 5. In this case, the inlet for introducing the slurry is formed at a location that is connected to the manifold (M). Accordingly, the slurry is introduced into the first die (110) and temporarily stored in the manifold (M).

[0064]

[0065] The above core assembly (200) is interposed between the first die (110) and the second die (120).

[0066] The above core assembly (200) includes a discharge port (Ou) through which slurry transferred from the die block is discharged.

[0067] FIG. 6 is a perspective view, a plan view, and a front view of a core assembly (200) included in the slot die device of FIG. 3, and FIG. 7 is a perspective view, a plan view, and a front view showing a modified example of the core assembly (200) of FIG. 6.

[0068] The above core assembly (200) includes a connecting portion (210) and a core portion (220) protruding from one surface of the connecting portion (210).

[0069] The above-mentioned connecting portion (210) is a portion that is directly connected to the second die (120) and serves to replace the die lip (111).

[0070] The above-mentioned joining portion (210) has a shape corresponding to the inner surface of the second die (120) in which the die lip (111) is not formed among the die blocks.

[0071] The above-mentioned core assembly (200) is configured to be detachable from the die block. That is, when wear occurs in the joint portion (210) that functions as the die lip (111), the core assembly (200) can be separated from the die block and polished.

[0072] In some embodiments, when the second die (120) includes a manifold (M) as illustrated in FIG. 4, the connecting portion (210) has a square frame shape with an opening at the center (220) corresponding to the shape of the manifold (M). Accordingly, the slurry introduced through the manifold (M) of the second die (120) passes through the opening (Op) of the connecting portion (210), and the flow direction is controlled by the center (220) and the inner surface of the first die (110).

[0073] In another embodiment, when the second die (120) does not include a manifold (M) as illustrated in FIG. 5, the connecting portion (210) has a flat plate shape corresponding to the flat inner surface shape of the second die (120) as illustrated in FIG. 7. Accordingly, the flow direction of the slurry introduced through the manifold (M) of the first die (110) is controlled by the structure of the flat plate-shaped connecting portion (210) and the core (220).

[0074] Since the above-mentioned connecting portion (210) replaces the die lip (111) excluded from the second die (120), the position of the tip of the connecting portion (210) matches the position of the tip of the die lip (111) included in the first die (110). That is, the tip of the connecting portion (210) is connected to the second die (120) so as to be projected out from the tip of the second die (120) and thus functions as a die lip (111).

[0075]

[0076] The above-mentioned core (220) is formed by protruding from one side of the connecting portion (210) in a shape in which one side is open, as shown in FIG. 6.

[0077] The above core assembly (200) forms a discharge port (Ou) in the open portion of the core (220) located between the first die (110) and the coupling portion (210). That is, the slurry moves to the core assembly (200) through the manifold (M) of the die block and is discharged through the discharge port (Ou).

[0078] The core (220) included in the slot die device according to the first embodiment of the present invention is composed of a support portion (221) and a pair of guide portions (222). Specifically, the core (220) is composed of a support portion (221) that is coupled to the lower end of the coupling portion (210) and extends along the longitudinal direction of the coupling portion (210), and a pair of guide portions (222) that are coupled to both ends of the support portion (221) and extend along the width direction of the coupling portion (210) to form a discharge port (Ou).

[0079] The above support member (221) prevents the slurry transferred from the die block from leaking out to the rear end of the slot die device, and the guide member (222) coupled to both ends of the support member (221) guides the slurry so that it does not leak out to the side end of the slot die device while moving to the discharge port (Ou).

[0080] The amount of slurry transferred to the discharge port (Ou) and the width of coating can be adjusted by the distance between the guide portion (222). That is, the width of the discharge port (Ou) is determined in correspondence to the distance between the guide portion (222).

[0081]

[0082] (Second embodiment)

[0083] FIG. 8 is a perspective view, a plan view, and a front view of a core assembly (200) included in a slot die device according to a second embodiment of the present invention, and FIG. 9 is a perspective view, a plan view, and a front view showing a modified example of the core assembly (200) of FIG. 8.

[0084] The slot die device according to the second embodiment of the present invention may further include an extension portion (224) as illustrated in FIG. 8.

[0085] Specifically, the above-mentioned core (220) further includes an extension (224) coupled to an end of the above-mentioned guide portion (222).

[0086] The above extension portion (224) is formed to extend along the length direction of the coupling portion (210) by being connected to the end of the guide portion (222). The extension portion (224) substantially reduces the width of the discharge port (Ou) to limit the coating position and amount of the discharged slurry. For example, as the extension portion (224) becomes longer, the width of the discharge port (Ou) becomes smaller, and conversely, as the extension portion (224) becomes shorter, the width of the discharge port (Ou) becomes closer to the gap between the pair of guide portions (222).

[0087] That is, the width of the discharge port (Ou) of the slot die device according to the second embodiment of the present invention corresponds to the distance between the extension portion (224) and the guide portion (222).

[0088] According to some embodiments, the core assembly (200) may include an opening (Op) in the coupling portion (210) corresponding to the shape of the manifold (M) as illustrated in FIG. 8.

[0089] According to some other embodiments, the core assembly (200) may include a flat-shaped joint (210) without an opening (Op) formed therein, as illustrated in FIG. 9.

[0090] The shape of the above-mentioned joint (210) can be determined depending on whether a manifold (M) is formed in the second die (120) coupled to the above-mentioned joint (210).

[0091]

[0092] (Embodiment 3)

[0093] FIG. 10 is a perspective view, a plan view, and a front view of a core assembly (200) included in a slot die device according to a third embodiment of the present invention, and FIG. 11 is a perspective view, a plan view, and a front view showing a modified example of the core assembly (200) of FIG. 10.

[0094] The slot die device according to the third embodiment of the present invention may further include a separation section (223) as illustrated in FIG. 10.

[0095] Specifically, the core (220) is coupled to the support (221) so as to be positioned between the pair of guide parts (222), and further includes at least one separation part (223) formed to extend along the width direction of the coupling part (210).

[0096] The above separation part (223) serves to divide the discharge port (Ou) based on the longitudinal direction of the core assembly (200). Therefore, the slot die device including the separation part (223) discharges slurry through the discharge port (Ou) divided by the separation part (223). For example, when one separation part (223) is positioned between the guide parts (222), two independent coating layers can be formed, and when N separation parts (223) are positioned, N+1 independent coating layers can be formed.

[0097] According to some embodiments, the core assembly (200) may include an opening (Op) in the coupling portion (210) corresponding to the shape of the manifold (M) as illustrated in FIG. 10. In this case, the separating portion (223) may also cross the opening (Op).

[0098] According to some other embodiments, the core assembly (200) may include a flat-shaped joint (210) without an opening (Op) formed therein, as illustrated in FIG. 11. In this case, the slurry stored in the manifold (M) is independently introduced into the space partitioned by the separator (223).

[0099] The shape of the above-mentioned joint (210) can be determined depending on whether a manifold (M) is formed in the second die (120) coupled to the above-mentioned joint (210).

[0100]

[0101] The present invention has been described in more detail through drawings and examples. However, the configurations described in the drawings or examples described in this specification are merely embodiments of the present invention and do not represent all of the technical ideas of the present invention. Therefore, it should be understood that various equivalents and modified examples may exist as of the time of this application.

[0102]

[0103] (Explanation of symbols)

[0104] 10: (Prior art) Die

[0105] 20: (Prior art) Die lip

[0106] 30: (Prior art) Die sim

[0107] 40: (Prior art) Slit

[0108] 50: (Prior art) Sheet

[0109] 110: First die

[0110] 111: Die Lip

[0111] 120: Second die

[0112] 200: Core assembly

[0113] 210: Joint

[0114] 220: Deep

[0115] 221: Support

[0116] 222: Guide Department

[0117] 223: Separation Section

[0118] 224: Extension

[0119] Ou: outlet

[0120] Op: Opening

[0121] M: Manifold

Claims

1. A slot die device that coats by discharging the injected slurry. A die block including a first die having a protruding die lip and a second die coupled to the first die; and A core assembly interposed between the first die and the second die and including a discharge port through which slurry is discharged; The above core assembly is, a joining portion joined to the second die; and Including a core protruding from one side of the joint portion in a shape in which one side is open; A slot die device characterized in that the core assembly forms a discharge port in an open portion of the core located between the first die and the joint.

2. In paragraph 1, The above die block further includes a manifold in which the slurry is stored, A slot die device in which the above slurry is discharged by moving to the core assembly through the above manifold.

3. In paragraph 2, The above-mentioned joint is a slot die device having a square frame shape with an open center corresponding to the above-mentioned manifold shape.

4. In paragraph 2, A slot die device wherein the manifold is formed in at least one of the first die and the second die.

5. In paragraph 1, A slot die device in which the tip position of the above-mentioned joint matches the tip position of the die lip included in the first die.

6. In paragraph 1, A slot die device in which the leading end of the above-mentioned joint protrudes more than the leading end of the second die.

7. In paragraph 1, The above-mentioned deep part, A support portion coupled to the rear end of the above-mentioned joint and formed to extend along the length of the above-mentioned joint; and A slot die device comprising a pair of guide parts that are connected to both ends of the support part and extend along the width direction of the connecting part to form a discharge port.

8. In paragraph 7, A slot die device in which the width and length of the above discharge port correspond to the distance between the guide portions.

9. In paragraph 7, A slot die device further comprising: at least one separating portion formed to extend along the width direction of the joining portion, wherein the core portion is coupled to the support portion so as to be positioned between the pair of guide portions; 10. In paragraph 7, A slot die device further comprising an extension portion formed along the length direction of the coupling portion, wherein the core portion is coupled to an end of the guide portion.

11. In paragraph 10, A slot die device in which the width and length of the above discharge port correspond to the distance between the extension portions.

12. In paragraph 1, A slot die device in which the above core assembly is configured to be detachably attached to the die block.

Images