Mold coater capable of multilayer coating of active material

Abstract

The present invention relates to a die coater capable of simultaneously multi-layer coating a current collector of a secondary battery with two different liquids, the die coater including: a first body provided with a first manifold for accommodating an electrode slurry; a second body provided with a second manifold for accommodating an electrode slurry, coupled to the first body to form a first slit through which the electrode slurry accommodated in the first manifold is discharged; and a third body coupled to the second body to form a second slit through which the electrode slurry accommodated in the second manifold is discharged, wherein the first slit is formed through a first gasket and a third gasket interposed between coupling surfaces of the first body and the second body, the second slit is formed through a second gasket and a fourth gasket interposed between coupling surfaces of the second body and the third body, and at least any one of the third gasket and the fourth gasket forms an insulating liquid slit.

Description

Technical Field

[0001] This invention relates to a mold coating machine capable of coating multiple layers of current collectors for secondary batteries with two different liquids in a single process.

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2022-0042443, filed on April 5, 2022, the entire contents of which are incorporated herein by reference. Background Technology

[0003] With the development of technology and the increasing demand for mobile devices, the demand for rechargeable batteries is also rapidly increasing. Among them, lithium rechargeable batteries have the characteristics of high energy density, high operating voltage, good storage properties, and excellent lifespan, and are widely used as the energy source for various mobile devices and electronic products.

[0004] In lithium secondary batteries, electrodes are used where an active material layer and an insulating layer are formed on the surface of a current collector. These electrodes are manufactured by coating an electrode slurry containing an active material and an insulating liquid containing an insulating material onto the surface of the current collector using a coating apparatus such as a die coating machine, such that the electrode slurry and the insulating liquid partially overlap at the edges, top, and bottom of the electrode mixture layer, and then drying the coated electrode slurry and the coated insulating liquid.

[0005] In terms of production efficiency, it is impractical to apply electrode paste and insulating liquid separately in different processes. Therefore, to solve this problem, a technology has been developed that simultaneously discharges electrode paste and insulating liquid from a single die coating machine. For example, Korean Patent Registration No. 10-2035826 introduces a slit die that can simultaneously apply multiple layers of electrode paste and insulating liquid.

[0006] Simultaneously, two or more layers of active material can be coated on the surface of the current collector to improve performance. That is, the performance of the secondary battery can be improved by changing the composition of the lower active material layer that is in direct contact with the surface of the current collector and the upper active material layer that covers the upper side of the lower active material layer.

[0007] However, the upper active material layer covering the lower active material layer is prone to sliding at its edges, top, and bottom due to its fluidity, and this sliding is difficult to control during the coating process. When sliding at the edges, top, and bottom of the active material layer causes an inverted N / P ratio, lithium-ion deposition is likely to occur, which adversely affects the safety of the battery cell. The N / P ratio is the ratio of the capacity of the negative electrode to the capacity of the positive electrode. In lithium-ion secondary batteries using graphite negative electrodes, lithium deposition in the negative electrode during overcharging can only be prevented when the capacity of the negative electrode is greater than that of the positive electrode. In this regard, properly controlling the occurrence of sliding at the edges, top, and bottom of the active material layer is crucial to ensuring the safety of the battery cell.

[0008] Therefore, in order to improve the performance and productivity of secondary batteries, there is an urgent need to develop a mold coating machine that can actively respond to various requirements such as simultaneous coating with electrode slurry and insulating liquid and multilayer coating.

[0009] [Related Documents]

[0010] (Patent Document 001) Korean Patent Registration No. 10-2035826 (Published on October 24, 2019)

[0011] (Patent Document 002) Korean Patent Publication No. 10-2021-0155879 (Published on December 24, 2021) Summary of the Invention

[0012] (Technical issue)

[0013] One aspect of the present invention is to provide a mold coating machine capable of simultaneously coating a current collector of a secondary battery with two different liquids in multiple layers.

[0014] Furthermore, another aspect of the present invention provides a mold coating machine that allows for free adjustment and variation of the position of the discharge slit for insulating liquid.

[0015] However, the technical aspects of the present invention are not limited to those described above, and those skilled in the art will clearly understand other aspects not mentioned from the following description of the present invention.

[0016] (Technical Solution)

[0017] This invention relates to a mold coating machine capable of simultaneously coating a current collector of a secondary battery with two different liquids in multiple layers. The mold coating machine includes: a first body having a first manifold for containing electrode slurry; a second body having a second manifold for containing electrode slurry, coupled to the first body to form a first slit, through which the electrode slurry contained in the first manifold is discharged; and a third body coupled to the second body to form a second slit, through which the electrode slurry contained in the second manifold is discharged, wherein the first slit is formed by a first gasket and a third gasket placed between the coupling surfaces of the first body and the second body, the second slit is formed by a second gasket and a fourth gasket placed between the coupling surfaces of the second body and the third body, and at least one of the third gasket and the fourth gasket forms an insulating liquid slit.

[0018] The coupling surfaces of the second and third bodies can be tilted in the direction in which the second slit converges with the first slit.

[0019] The mold coating machine of the present invention may further include a through bolt that passes sequentially through the third body, the fourth gasket, the second body and the third gasket and is threadedly coupled to the first body.

[0020] A hollow channel can be formed in the longitudinal direction of the straight bolt, and insulating liquid supplied from the outside can be supplied to at least one of the third and fourth gaskets through the hollow channel.

[0021] The through bolt may have an insulating liquid supply hole communicating with the hollow channel to supply insulating liquid to the gaskets in the third and fourth gaskets that form insulating liquid slits.

[0022] The third and fourth gaskets may have a through hole for the straight bolt to pass through and an insulating liquid channel groove connected to the through hole to form the insulating liquid slit, and the insulating liquid supply hole of the straight bolt may be connected to the insulating liquid channel groove.

[0023] The third and fourth gaskets that do not form an insulating liquid slit may have through holes for straight bolts to pass through. Correspondingly, straight bolts that pass through the through holes in the third and fourth gaskets that do not form an insulating liquid slit may not have insulating liquid supply holes.

[0024] The hollow channel of the through bolt can form a depth sufficient to communicate with the insulating liquid supply hole.

[0025] The through bolt can apply pressure to bring the third and second bodies into close contact with the first body, thereby enhancing the adhesion of the lip region of the insulating liquid slit.

[0026] The width of the first slit can be limited by the width of the third gasket, and the width of the second slit can be limited by the width of the fourth gasket.

[0027] (Beneficial effects)

[0028] The mold coating machine of the present invention, having the above configuration, is configured to simultaneously discharge two different liquids, such as electrode slurry and insulating liquid. In particular, in the mold coating machine, the electrode slurry and insulating liquid are physically separated from each other through a discharge slit. Therefore, the mold coating machine of the present invention enables the current collector to be coated simultaneously and effectively with two different liquids.

[0029] Furthermore, by selectively forming insulating liquid channel grooves in the third and fourth gaskets, the position and number of insulating liquid slits can be freely adjusted. Therefore, the slippage phenomenon occurring at the corners of the active material layer can be easily regulated by adjusting the position and number of insulating liquid slits.

[0030] Furthermore, since the insulating liquid can be selectively supplied to the gasket with the insulating liquid channel groove only through the through hole with the hollow part, the part in the flow path of the insulating liquid that may leak can be minimized, thereby more effectively suppressing the internal mixing of the electrode slurry and the insulating liquid.

[0031] However, the technical effects of the present invention are not limited to those described above, and those skilled in the art will clearly understand other unmentioned effects from the following description of the present invention. Attached Figure Description

[0032] The accompanying drawings illustrate embodiments of the invention and, together with the detailed description of the invention to be performed below, serve to further convey the technical essence of the invention. Therefore, the invention should not be construed as being limited to the matters described in these drawings.

[0033] Figure 1 This is a perspective view showing a mold coating machine according to an embodiment of the present invention.

[0034] Figure 2 yes Figure 1 Exploded perspective view of a mold coating machine.

[0035] Figure 3 This is a plan view showing the first slit with the second and third bodies removed.

[0036] Figure 4 This is a plan view showing the second slit with the third body removed.

[0037] Figure 5 This is a front view of the mold coating machine of the present invention.

[0038] Figure 6 This is a partial perspective view showing a mold coating machine according to a first embodiment of the present invention.

[0039] Figure 7 It is along Figure 6 A cross-sectional view of the mold coating machine with the line "AA".

[0040] Figure 8 This is a partial perspective view showing a mold coating machine according to a second embodiment of the present invention.

[0041] Figure 9 It is along Figure 8 A cross-sectional view of the mold coating machine with the line "BB".

[0042] Figure 10 This is a partial perspective view showing a mold coating machine according to a third embodiment of the present invention.

[0043] Figure 11 It is along Figure 10 A cross-sectional view of a mold coating machine with the line "CC". Detailed Implementation

[0044] Since the present invention can be varied and implemented in different ways, specific implementation methods will be described in detail below.

[0045] However, it should be understood that the present invention is not limited to the specific embodiments, but includes all variations, equivalents and alternatives that are included in the spirit and scope of the present invention.

[0046] It should be understood that in this invention, terms such as “comprising” and “having” are intended to indicate the presence of features, numbers, steps, operations, elements, components or combinations thereof described in the specification, and do not preclude the possibility of the presence or addition of one or more other features, numbers, steps, operations, elements, components or combinations thereof.

[0047] Furthermore, in this invention, when describing a first portion, such as a layer, film, region, or plate, as being "above" a second portion, this includes not only the case where the first portion is "directly above" the second portion, but also the case where a third portion exists between them. Conversely, when describing a first portion, such as a layer, film, region, or plate, as being "below" a second portion, this includes not only the case where the first portion is "directly below" the second portion, but also the case where a third portion exists between them. Moreover, in this application, the state of placing the first portion "above" the second portion can include not only the state of placing the first portion above the second portion, but also the state of placing the first portion below the second portion.

[0048] This invention relates to a mold coating machine capable of simultaneously coating a current collector of a secondary battery with two different liquids, particularly an electrode slurry and an insulating liquid, in multiple layers. The mold coating machine of this invention comprises: a first body having a first manifold for receiving the electrode slurry; a second body having a second manifold for receiving the electrode slurry and coupled to the first body to form a first slit, through which the electrode slurry contained in the first manifold is discharged; and a third body coupled to the second body to form a second slit, through which the electrode slurry contained in the second manifold is discharged.

[0049] Here, the first slit is formed by a first gasket and a third gasket placed between the coupling surfaces of the first body and the second body, and the second slit is formed by a second gasket and a fourth gasket placed between the coupling surfaces of the second body and the third body, wherein at least one of the third gasket and the fourth gasket forms an insulating liquid slit.

[0050] The die coating machine of the present invention, having the above configuration, is configured to simultaneously discharge two different liquids, such as electrode slurry and insulating liquid. In particular, in the die coating machine, the slits through which the electrode slurry and insulating liquid are discharged are physically separated from each other. Therefore, the die coating machine of the present invention enables the simultaneous and efficient coating of the current collector with two different liquids.

[0051] Furthermore, the position and number of insulating liquid slits can be freely adjusted by selectively forming insulating liquid channel grooves in the third and fourth gaskets. Therefore, slippage occurring at the corners of the active material layer can be easily controlled by adjusting the position and number of insulating liquid slits.

[0052] [Detailed Description of Preferred Embodiments]

[0053] Hereinafter, detailed embodiments of the mold coating machine of the present invention will be described in detail with reference to the accompanying drawings. For reference, the front-back direction, up-down direction, or left-right direction indicating a relative position used in the following description are intended to aid in understanding the present invention, and unless otherwise defined, are based on the directions shown in the accompanying drawings.

[0054] [First Implementation Method]

[0055] Figure 1 This is a perspective view showing a die coating machine 10 according to an embodiment of the present invention. Figure 2 yes Figure 1 An exploded perspective view of the mold coating machine 10 of the present invention. The overall structure of the mold coating machine 10 of the present invention will be referred to below. Figure 1 and 2 Describe it.

[0056] The mold coating machine 10 of the present invention can simultaneously coat the current collector of a secondary battery with electrode slurry and insulating liquid in multiple layers. For this purpose, the mold coating machine 10 of the present invention has a structure in which three main bodies, a first main body 100, a second main body 200 and a third main body 300, are coupled together.

[0057] The first body 100 is part of the main body of the mold coating machine 10 and is provided with a first manifold 110 for receiving electrode slurry. A first slurry inlet 120 communicating with the first manifold 110 is provided on the lower surface of the first body 100, and electrode slurry supplied from the outside fills the first manifold 110 through the first slurry inlet 120.

[0058] The second body 200 is provided with a second manifold 210 for containing electrode paste and is coupled to the first body 100 to form a first slit 470 through which the electrode paste contained in the first manifold 110 is discharged. Therefore, the first manifold 110 covered by the second body 200 is sealed.

[0059] The third body 300 is coupled to the second body 200 and covers the second manifold 210 to form a second slit 480. Electrode paste contained in the second manifold 210 of the second body 200 is discharged through the second slit 480. A second paste inlet 310 communicating with the second manifold 210 is provided on the upper surface of the third body 300, and electrode paste supplied through the second paste inlet 310 fills the second manifold 210.

[0060] Thus, the main body of the mold coating machine 10 is completed by coupling the second body 200 and the third body 300 to the first body 100 in a multi-layered sequence. Accordingly, a first slit 470 is formed between the coupling surfaces of the first body 100 and the second body 200, and a second slit 480 is formed between the coupling surfaces of the second body 200 and the third body 300. Furthermore, the coupling surfaces of the second body 200 and the third body 300 are inclined and converged in the direction in which the second slit 480 and the first slit 470 converge, and are close to each other. Figure 5 This is a front view of the mold coating machine 10 of the present invention. Since the first slit 470 and the second slit 480 are arranged close to each other, it is convenient to coat the electrode paste in multiple layers.

[0061] Figure 3 This is a plan view of the first slit 470 with the second body 200 and the third body 300 removed. Figure 4This is a plan view of the second slit 480 with the third body 300 removed. As shown, the first slit 470 is formed by a first gasket 410 and a third gasket 430 placed between the coupling surfaces of the first body 100 and the second body 200, and the second slit 480 is formed by a second gasket 420 and a fourth gasket 440 placed between the coupling surfaces of the second body 200 and the third body 300.

[0062] The first gasket 410 and the second gasket 420 are provided with corresponding structures, and the third gasket 430 and the fourth gasket 440 are provided with similar shapes. Here, the third gasket 430 and the fourth gasket 440 can be distinguished based on the presence or absence of an insulating liquid slit 490. In the first embodiment shown, an insulating liquid slit 490 is formed in the third gasket 430, while no insulating liquid slit 490 is formed in the fourth gasket 440.

[0063] A first gasket 410 and a third gasket 430, positioned between the first body 100 and the second body 200, form a slit with a height suitable for discharging electrode slurry. The first gasket 410 and the third gasket 430 form a mutually separated first slit 470 and an insulating liquid slit 490. Specifically, the first gasket 410 forms the first slit 470 through which the electrode slurry contained in the first manifold 110 of the first body 100 is discharged, and the third gasket 430 forms the insulating liquid slit 490 through which the insulating liquid passing through the second body 200 and the third body 300 is discharged. The supply path of the insulating liquid to the third gasket 430 will be described in detail in the relevant sections.

[0064] Since the first gasket 410 and the third gasket 430 have the same height and do not overlap vertically, they are configured to be coplanar between the first body 100 and the second body 200. Therefore, the upper and lower surfaces of the first gasket 410 and the third gasket 430 are brought into close contact with the first body 100 and the second body 200 by the pressure applied by the fastening of the first body 100 and the second body 200 (e.g., bolt fastening). This maintains a seal.

[0065] Since the construction of the second gasket 420 and the fourth gasket 440, located between the second body 200 and the third body 300, corresponds to that of the first gasket 410 and the third gasket 430, their repeated description will be omitted. However, in the first embodiment, the difference is that the insulating liquid slit 490 is not formed in the fourth gasket 440, while according to another embodiment described below, the insulating liquid slit 490 may also be formed in the fourth gasket 440.

[0066] The mold coating machine 10 of the present invention includes a through bolt 500 that passes sequentially through a third body 300, a fourth gasket 440, a second body 200, and a third gasket 430, and is coupled to the threads of a first body 100. The through bolt 500 is responsible for at least a portion of the tightening force for sealing the first gasket 410 to the fourth gasket 440, while simultaneously coupling the first bodies 100 to each other with the third body 300. That is, by threading the third body 300 and the second body 200 to the first body 100 with another bolt (not shown) other than the through bolt 500, a stronger tightening force can be increased, especially since the through bolt 500 of the present invention also passes sequentially through the fourth gasket 440 and the third gasket 430.

[0067] The reason why the through bolt 500 passes through the fourth washer 440 and the third washer 430 in sequence is not only to generate a fastening force on the first body 100, but also to supply insulating liquid to the third washer 430, which has an insulating liquid slit 490 formed on its lower side. For this purpose, a hollow channel 510 is formed in the longitudinal direction of the through bolt 500, and the insulating liquid supplied from the outside is supplied to the third washer 430 through the hollow channel 510 of the through bolt 500.

[0068] Figure 6 This is a partial perspective view showing a mold coating machine according to a first embodiment of the present invention. Figure 7 It shows along Figure 6 A cross-sectional view of the mold coating machine for the line "AA". As shown, the through bolt 500 has an insulating liquid supply hole 520 on its lower side, which communicates with the hollow channel 510 to supply insulating liquid to the third gasket 430 and the fourth gasket 440 for forming the insulating liquid slit 490, i.e., the third gasket 430.

[0069] Additionally, the third gasket 430 for forming the insulating liquid slit 490 is provided with a through hole 450. A through bolt 500 passes through the through hole 450 and approaches the first body 100. The third gasket 430 is provided with an insulating liquid channel groove 460 connected to the through hole 450 to form the insulating liquid slit 490. The insulating liquid channel groove 460 is formed on the third gasket 430 in the form of a groove with a bottom surface, and the outlet of the insulating liquid channel groove 460 forms the insulating liquid slit 490. The insulating liquid supply hole 520 of the through bolt 500 passing through the through hole 450 of the third gasket 430 communicates with the insulating liquid channel groove 460 to supply insulating liquid to the third gasket 430.

[0070] Meanwhile, neither the third gasket 430 nor the fourth gasket 440 forms an insulating liquid slit 490. Specifically, the fourth gasket 440 only has a through hole 450 through which the straight bolt 500 passes. Therefore, the straight bolt 500 passes through the fourth gasket 440 and the second body 200 and reaches the third gasket 430. Furthermore, since the fourth gasket 440 does not have an insulating liquid slit 490, the straight bolt 500 does not need to have an insulating liquid supply hole 520 in the fourth gasket 440. This is because an unnecessary insulating liquid supply hole 520 only increases the probability of leakage in the flow path of the insulating liquid.

[0071] Furthermore, as shown in the figure, the tip of the through bolt 500 through the through hole 450 of the third gasket 430 is threadedly coupled to the first body 100. Therefore, the through bolt 500 applies pressure in the direction where the third body 300 and the second body 200 are in close contact with the first body 100. This enhances the adhesion of the lip region (corner region) of the insulating liquid slit 490 of the third gasket 430, thereby effectively suppressing the mixing of the electrode paste and the insulating liquid.

[0072] At the same time, refer to Figure 3 and 4 The width of the first slit 470 formed by the first gasket 410 is limited by the width of the third gasket 430, and the width of the second slit 480 formed by the second gasket 420 is limited by the width of the fourth gasket 440. This is because the third gasket 430 and the fourth gasket 440 block the electrode paste channels of the first slit 470 and the second slit 480 with their widths.

[0073] Furthermore, three third gaskets 430 (and a corresponding fourth gasket 440) are arranged on the first slit 470. The third gaskets 430 on both sides have an insulating liquid channel groove 460, while the central third gasket 430 has two insulating liquid channel grooves 460. The reason for providing the central third gasket 430 is to separate the electrode paste discharged through the first slit 470, thereby forming two rows of active material layers at once. Therefore, the third gasket 430 has two insulating liquid channel grooves 460, so that the corners of the active material layers on both sides are coated with insulating liquid.

[0074] In embodiments where the electrode paste is not separated, the third gasket 430, the fourth gasket 440, and the straight bolt 500 are not required, and those skilled in the art can clearly understand this embodiment from the accompanying drawings alone.

[0075] [Second Implementation]

[0076] Figure 8 This is a partial perspective view showing a mold coating machine according to a second embodiment of the present invention. Figure 9 It shows along Figure 8A cross-sectional view of the mold coating machine with the line "BB".

[0077] In contrast to the first embodiment, the second embodiment corresponds to an embodiment in which an insulating liquid channel groove 460 is provided in the fourth gasket 440, while no insulating liquid channel groove 460 is provided in the third gasket 430.

[0078] The second embodiment differs from the first embodiment in that the positions of the third gasket 430 and the fourth gasket 440 are changed, as well as the configuration of the through bolt 500 that accompanies these changes. Therefore, the second embodiment will be described below based on these differences.

[0079] The third gasket 430 located on the first slit 470 does not have an insulating liquid channel groove 460 formed in it, but only a through hole 450 through which the straight bolt 500 passes. The fourth gasket 440 located on the second slit 480 has a through hole 450 and an insulating liquid channel groove 460 connected to the through hole 450. That is, the insulating liquid and the electrode slurry are discharged on the same plane through the second slit 480 located above the mold coating machine 10. Therefore, compared to the first embodiment, the second embodiment is an advantageous embodiment for controlling slippage when excessive slippage occurs in the upper active material layer formed by the second slit 480.

[0080] Furthermore, in the through bolt 500, an insulating liquid supply hole 520 is formed at a point corresponding to the insulating liquid channel groove 460 of the fourth washer 440 to supply insulating liquid to the fourth washer 440, while no insulating liquid supply hole 520 is formed in the third washer 430. The structure of the through bolt 500 in the second embodiment is now clearly understood compared to the preceding figures.

[0081] Furthermore, considering the strength of the through bolt 500, it is preferable that the hollow channel 510 of the through bolt 500 is formed to a depth sufficient to communicate with the insulating liquid supply hole 520 in the fourth gasket 440, and is not formed below it (towards the third gasket).

[0082] [Third Implementation Method]

[0083] Figure 10 This is a partial perspective view showing a mold coating machine according to a third embodiment of the present invention. Figure 11 It shows along Figure 10 A cross-sectional view of a mold coating machine for the "CC" line.

[0084] The third embodiment shown relates to the formation of insulating liquid channel grooves 460 in the third gasket 430 and the fourth gasket 440. Therefore, in the third embodiment, the insulating liquid is discharged in layers along with the electrode paste discharged through the first slit 470 and the second slit 480. In this respect, the third embodiment can be an embodiment for controlling the sliding phenomenon of the upper and lower active material layers.

[0085] Furthermore, insulating liquid supply holes 520 are formed at two points on the through bolt 500, corresponding to the insulating liquid channel grooves 460 of the third gasket 430 and the fourth gasket 440, so as to simultaneously supply insulating liquid to the third gasket 430 and the fourth gasket 440. The structure of the through bolt 500 in the third embodiment can also be clearly understood from the accompanying drawings.

[0086] In the embodiment shown in the figures, the insulating fluid is supplied through the head of a through bolt 500, which is inserted from the upper third body 300 into the first body 100. In the third embodiment, after the insulating fluid is first supplied to the upper fourth gasket 440, the remaining insulating fluid is supplied to the lower third gasket 430. Therefore, in order to supply the insulating fluid at a more uniform flow rate, it can be considered that the cross-sectional area of ​​the insulating fluid supply hole 520 of the fourth gasket 440 is designed to be smaller than the cross-sectional area of ​​the insulating fluid supply hole 520 of the third gasket 430.

[0087] Thus, the mold coating machine 10 of the present invention can actively and effectively deal with the slippage of the active material layer in various aspects without changing other important design elements of the mold coating machine 10, as long as the third gasket 430 and the fourth gasket 440 with or without the insulating liquid channel groove 460 are appropriately selected according to the situation and the corresponding straight bolts 500 are used.

[0088] The present invention has been described in more detail above with reference to the accompanying drawings and embodiments. However, since the configurations described in the drawings or the embodiments described in this specification are merely embodiments of the present invention and do not represent the full technical essence of the present invention, it should be understood that various equivalent methods and modifications may exist, which can replace the configuration present at the time of this application.

[0089] [Explanation of reference numerals in the attached figures]

[0090] 10; Mold Coating Machine

[0091] 100; First subject

[0092] 110; First manifold

[0093] 120; First slurry inlet

[0094] 200; Second subject

[0095] 210; Second manifold

[0096] 300; Third subject

[0097] 310; Second slurry inlet

[0098] 410; First gasket

[0099] 420; Second gasket

[0100] 430: Third gasket

[0101] 440: Fourth gasket

[0102] 450; Through hole

[0103] 460; Insulating liquid channel groove

[0104] 470: First slit

[0105] 480: Second slit

[0106] 490; Insulating liquid slit

[0107] 500; Straight bolt

[0108] 510; Hollow Channel

[0109] 520; Insulating fluid supply port (industrial applicability)

[0110] This invention relates to a mold coating machine for manufacturing current collectors for secondary batteries.

Claims

1. A mold coating machine, comprising: The first body is provided with a first manifold for containing electrode paste; The second body has a second manifold for containing electrode paste, coupled to the first body to form a first slit, through which the electrode paste contained in the first manifold is discharged. as well as A third body is coupled to the second body to form a second slit, through which electrode paste contained in the second manifold is discharged. The first slit is formed by a first gasket and a third gasket placed between the coupling surfaces of the first body and the second body, and the second slit is formed by a second gasket and a fourth gasket placed between the coupling surfaces of the second body and the third body. At least one of the third and fourth gaskets forms an insulating liquid slit. The third gasket is separated from the first gasket, and the fourth gasket is separated from the second gasket, so that the position and number of the insulating liquid slits can be freely adjusted.

2. The mold coating machine according to claim 1, wherein the coupling surfaces of the second body and the third body are inclined in the direction in which the second slit and the first slit converge.

3. The mold coating machine according to claim 1 further includes a through bolt that passes sequentially through the third body, the fourth gasket, the second body and the third gasket and is threadedly coupled to the first body.

4. The mold coating machine according to claim 3, wherein a hollow channel is formed in the longitudinal direction of the straight bolt, and An insulating liquid supplied from the outside is supplied to at least one of the third gasket and the fourth gasket through the hollow channel.

5. The mold coating machine according to claim 4, wherein the through bolt has an insulating liquid supply hole communicating with the hollow channel to supply the insulating liquid to the gaskets in the third gasket and the fourth gasket for forming the insulating liquid slit.

6. The mold coating machine according to claim 5, wherein the third gasket and the fourth gasket, the gasket for forming the insulating liquid slit, are provided with a through hole for the straight bolt to pass through and an insulating liquid channel groove connected to the through hole to form the insulating liquid slit, and The insulating liquid supply hole of the straight bolt is connected to the insulating liquid channel groove.

7. The mold coating machine according to claim 5, wherein the third gasket and the fourth gasket that do not form the insulating liquid slit are provided with through holes for the straight bolt to pass through.

8. The mold coating machine according to claim 7, wherein the through bolt, which passes through a through hole in a gasket that does not form the insulating liquid slit in the third and fourth gaskets, does not have the insulating liquid supply hole.

9. The mold coating machine according to claim 6, wherein the hollow channel of the through bolt is formed to a depth sufficient to communicate with the insulating liquid supply hole.

10. The mold coating machine according to claim 3, wherein the through bolt applies pressure to bring the third body and the second body into close contact with the first body, thereby enhancing the adhesion of the lip region of the insulating liquid slit.

11. The mold coating machine according to claim 1, wherein the width of the first slit is limited by the width of the third gasket.

12. The mold coating machine according to claim 1, wherein the width of the second slit is limited by the width of the fourth gasket.

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