Application apparatus and application method

Abstract

This application apparatus for applying an adhesive to a pouch accommodating an electrode assembly comprises: a supply unit which generates and supplies compressed air; a pair of nozzle units which are spaced apart by a certain interval from each other, and comprise discharge ports for discharging the adhesive; and a drive unit which moves the pair of nozzle units and controls the supply unit, wherein the pair of nozzle units comprise a plurality of air holes which are formed around the discharge ports and spray the compressed air supplied from the supply unit toward the outer circumferences of the discharge ports, and the drive unit controls the pressure of the compressed air supplied to the plurality of air holes according to the positions of the pair of nozzle units. According to the application apparatus, during a secondary battery manufacturing process, foreign substances in the discharge ports, through which the adhesive is discharged when applying the adhesive to the pouch accommodating the electrode assembly, can be removed.

Description

Application device and application method

[0001] The present invention relates to a coating device and a coating method for removing foreign substances from an adhesive discharge port when applying adhesive to a pouch that accommodates an electrode assembly in a secondary battery manufacturing process.

[0002] In general, a secondary battery is a battery that converts external electrical energy into chemical energy, stores it, and then generates electricity when needed. Commonly used secondary batteries include lead-acid batteries, nickel-cadmium batteries (Ni-Cd), nickel-metal hydride batteries (NiMH), lithium-ion batteries (Li-ion), and lithium-ion polymer batteries (Li-ion polymer).

[0003] These secondary batteries are manufactured by applying an active material to the surface of an electrode current collector to form a positive electrode and a negative electrode, interposing a separator between them to form an electrode assembly, and then mounting the electrode assembly inside a cylindrical or square metal can or a pouch-shaped case made of aluminum laminate sheet. The electrode assembly is manufactured mainly by injecting or impregnating a liquid electrolyte or using a solid electrolyte.

[0004] Therefore, secondary batteries are charged and discharged by allowing ions of the electrolyte injected between the positive and negative electrodes, which are insulated by a separator, to move between the positive and negative electrodes.

[0005] The electrodes used in the positive and negative electrodes of these secondary batteries include an electrode body constituting the electrode and an electrode active material coated on the electrode body.

[0006] The above electrode body may be generally processed into a sheet, thin plate, or foil form using a metal with excellent conductivity, such as aluminum (Al) or copper (Cu).

[0007] An electrode film for forming an electrode assembly is manufactured in a form in which an active material is applied to a portion of the film and the electrode body is exposed in the remaining portion.

[0008] The exposed portion of the above electrode body is processed to function as an electrode terminal for connecting the positive and negative electrodes to the outside when forming an electrode assembly (positive electrode, negative electrode, and separator).

[0009] Secondary batteries can be classified into cylindrical, prismatic, and pouch types depending on their shape.

[0010] Among them, pouch-type secondary batteries are widely used in the secondary battery industry because they can have relatively free shapes by accommodating the above-described electrode assembly in a flexible pouch, have a relatively easy manufacturing process, and have low manufacturing costs.

[0011] Here, the pouch performs the function of protecting the battery cell, which is composed of an electrolyte introduced into the interior through a subsequent process for manufacturing a pouch-type secondary battery. In addition, the pouch is configured in a form in which a metal film is interposed to complement the electrochemical properties of the battery cell and enhance heat dissipation, etc. In order to secure insulation between the battery cell and the outside, the metal film is formed on the outside with an insulating layer coated with an insulating material such as polyethylene terephthalate (PET) resin or nylon resin.

[0012] Meanwhile, there has been a recent need from consumers to increase the capacity of secondary batteries, and accordingly, in the secondary battery manufacturing process, an adhesive is applied to the outer surface of a pouch that accommodates an electrode assembly to bond multiple pouches together, thereby increasing the capacity of the secondary battery.

[0013] In this case, foreign substances, such as adhesive residue, remain around the adhesive dispensing port, and as the adhesive application process is repeated, these foreign substances fly away. Furthermore, the adhesive is applied without forming a uniform adhesive pattern on the pouch. Ultimately, these problems lead to poor adhesion and poor product quality.

[0014] Therefore, a means is required to solve the above-described problem and improve product quality through a cleaning process that removes foreign substances from the discharge port through which the adhesive is discharged in the manufacturing process of applying the adhesive to the pouch.

[0015] The present invention provides a coating device and a coating method, and more specifically, the purpose of the present invention is to provide a coating device and a coating method for removing foreign substances from an adhesive discharge port when applying adhesive to a pouch that accommodates an electrode assembly in a secondary battery manufacturing process.

[0016] In addition, the purpose is to provide a coating device and coating method that can improve product quality by minimizing the scattering of foreign substances from a discharge port when applying adhesive to a pouch and forming a uniform adhesive pattern.

[0017] The problems to be solved by the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by a person having ordinary skill in the technical field to which the present invention belongs from the description below.

[0018] A coating device for applying an adhesive to a pouch containing an electrode assembly, comprising: a supply unit for generating and supplying compressed air; a pair of nozzle units spaced apart from each other by a predetermined interval and including discharge ports for discharging adhesive; and a driving unit for moving the pair of nozzle units and controlling the supply unit, wherein the pair of nozzle units include a plurality of air holes formed around the discharge ports and spraying compressed air supplied from the supply unit toward an outer surface of the discharge ports, and wherein the driving unit controls the pressure of compressed air supplied to the plurality of air holes according to the positions of the pair of nozzle units.

[0019] The above driving unit can move the pair of nozzle units so that they are positioned at a reference position away from one side of the pouch and at a dispensing position spaced apart from one side of the pouch by a predetermined distance.

[0020] The above driving unit can control the pressure of the compressed air supplied when the pair of nozzle units are positioned at the application position to be higher than the pressure of the compressed air supplied when the pair of nozzle units are positioned at the reference position.

[0021] The pressure of the compressed air supplied when the above pair of nozzles are positioned at the application position may be 0.6 bar or more and 1.0 bar or less.

[0022] The above driving unit can control the pressure of the compressed air supplied so that it is maintained when the pair of nozzle units move from the reference position to the application position and from the application position to the reference position.

[0023] The pressure of the compressed air supplied when the above pair of nozzles are positioned at the reference position may be 5 bar or more.

[0024] The above driving unit can adjust the spacing between the pair of nozzle units on one side of the pouch when the nozzle units are positioned at the application position.

[0025] The above driving unit can be controlled to spray compressed air through the plurality of air holes when the pair of nozzle units are positioned at the application position, and to apply adhesive to one surface of the pouch through the discharge port.

[0026] The above discharge port has a tapered shape in which the diameter decreases toward one side, and the plurality of air holes can be formed on an inclined surface extending from the other side of the discharge port.

[0027] The diameter of the above plurality of air holes may be 0.305 mm or more and 0.762 mm or less.

[0028] The number of the above multiple air holes may be 7 or more and 11 or less.

[0029] The above pair of nozzle parts can be spaced apart so that the gap between the discharge ports is 12 mm or more and 13 mm or less.

[0030] A method for applying an adhesive to a pouch accommodating an electrode assembly is provided, comprising: a step of spraying compressed air toward an outer circumferential surface of a discharge port that discharges adhesive through a plurality of air holes when a pair of nozzle parts are positioned at a reference position off one surface of the pouch; a step of positioning the pair of nozzle parts at a spray position spaced apart from one surface of the pouch by a predetermined interval; a step of spraying compressed air through the plurality of air holes and applying adhesive to one surface of the pouch through the discharge port; and a step of positioning the pair of nozzle parts at the reference position.

[0031] The pressure of the compressed air injected when the pair of nozzle parts are positioned at the application position may be higher than the pressure of the compressed air injected when the pair of nozzle parts are positioned at the reference position.

[0032] The pressure of the compressed air sprayed when the pair of nozzle parts moves from the reference position to the application position and from the application position to the reference position can be maintained.

[0033] The coating device and coating method according to the present invention can remove foreign substances from an adhesive discharge port when applying adhesive to a pouch containing an electrode assembly in a secondary battery manufacturing process.

[0034] In addition, when applying adhesive to a pouch, the quality of the product can be improved by minimizing the scattering of foreign substances from the discharge port and forming a uniform adhesive pattern.

[0035] The effects that can be obtained from the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by a person having ordinary skill in the art to which the present invention belongs from the description below.

[0036] FIG. 1 is a drawing illustrating a coating device according to one embodiment of the present invention.

[0037] FIG. 2 is a drawing of a pair of nozzle parts viewed from below in a coating device according to one embodiment of the present invention.

[0038] FIG. 3 is a drawing showing a plurality of air holes that spray compressed air toward the outer circumference of a discharge port in a coating device according to one embodiment of the present invention.

[0039] FIG. 4 is a drawing for explaining the movement of a pair of nozzle parts in a coating device according to one embodiment of the present invention.

[0040] FIG. 5 is a drawing for explaining the spacing between a pair of nozzles on one side of a pouch in a coating device according to one embodiment of the present invention.

[0041] FIG. 6 is a drawing showing an adhesive applied to one side of a pouch through an application device according to one embodiment of the present invention.

[0042] Figure 7 is a drawing for explaining a coating method according to one embodiment of the present invention.

[0043] Hereinafter, embodiments disclosed in this specification will be described in detail with reference to the attached drawings. Regardless of the drawing numbers, identical or similar components will be given the same reference numbers and redundant descriptions thereof will be omitted. The suffixes "module" and "part" used for components in the following description are assigned or used interchangeably only for the convenience of writing the specification, and do not in themselves have distinct meanings or roles. In addition, when describing the embodiments disclosed in this specification, if it is determined that a specific description of a related known technology may obscure the gist of the embodiments disclosed in this specification, a detailed description thereof will be omitted. In addition, the attached drawings are only intended to facilitate easy understanding of the embodiments disclosed in this specification, and the technical ideas disclosed in this specification are not limited by the attached drawings, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and technical scope of the present invention.

[0044] Terms that include ordinal numbers, such as first, second, etc., may be used to describe various components, but the components are not limited by these terms. These terms are used solely to distinguish one component from another.

[0045] When a component is referred to as being "connected" or "connected" to another component, it should be understood that it may be directly connected or connected to that other component, but that there may be other components intervening. Conversely, when a component is referred to as being "directly connected" or "connected" to another component, it should be understood that there are no other components intervening.

[0046] Singular expressions include plural expressions unless the context clearly indicates otherwise.

[0047] In this application, terms such as “include” or “have” are intended to specify the presence of a feature, number, step, operation, component, part or combination thereof described in the specification, but should be understood not to exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

[0048] FIG. 1 is a drawing illustrating a coating device (100) according to one embodiment of the present invention. FIG. 2 is a drawing illustrating a pair of nozzle parts (120) in the coating device (100) according to one embodiment of the present invention as viewed from below. FIG. 3 is a drawing illustrating a plurality of air holes (122) for spraying compressed air (111) toward the outer circumference of the discharge port (121) in the coating device (100) according to one embodiment of the present invention. FIG. 4 is a drawing for explaining the movement of a pair of nozzle parts (120) in the coating device (100) according to one embodiment of the present invention. FIG. 5 is a drawing for explaining the spacing between a pair of nozzle parts (120) on one surface of a pouch (10) in the coating device (100) according to one embodiment of the present invention. And FIG. 6 is a drawing illustrating a form in which an adhesive (170) is applied to one surface of a pouch (10) through the coating device (100) according to one embodiment of the present invention.

[0049] An application device (100) according to one embodiment of the present invention can apply an adhesive (170) to a pouch (10) that accommodates an electrode assembly. Here, the electrode assembly may include a positive electrode and a negative electrode formed by applying an active material to the surface of an electrode current collector as described above, and a separator interposed therebetween.

[0050] Referring to FIG. 1, an application device (100) according to one embodiment of the present invention may include a supply unit (110), a pair of nozzle units (120), and a driving unit (130). Here, the supply unit (110) may serve to generate and supply compressed air (111). The pair of nozzle units (120) may be spaced apart from each other by a predetermined interval and may serve to apply an adhesive (170) to a pouch (10). In addition, the driving unit (130) may serve to move the pair of nozzle units (120) and control the supply unit (110). In addition, the pair of nozzle units (120) may be coupled to a head (140) coupled to one side of the supply unit (110).

[0051] Referring to FIGS. 2 and 3 together, in a coating device (100) according to one embodiment of the present invention, a pair of nozzle parts (120) may include a discharge port (121) for discharging adhesive (170). In addition, the pair of nozzle parts (120) may be formed around the discharge port (121) and may include a plurality of air holes (122) for spraying compressed air (111) supplied from the supply part (110) toward the outer circumferential surface of the discharge port (121). At this time, the above-described driving part (130) may play a role in controlling the pressure of the compressed air (111) supplied to the plurality of air holes (122) according to the positions of the pair of nozzle parts (120).

[0052] As described above, there has been a recent need from consumers to increase the capacity of secondary batteries, and accordingly, in the secondary battery manufacturing process, an adhesive (170) is applied to the outer surface of a pouch (10) that accommodates an electrode assembly, thereby bonding a plurality of pouches (10), thereby increasing the capacity of the secondary battery.

[0053] In this case, foreign substances such as adhesive residue (170) may remain around the discharge port (121) that discharges the adhesive (170), and a problem may arise in which the foreign substances fly away as the adhesive (170) application process is repeated. In addition, a problem may arise in which the adhesive (170) is applied without forming a uniform adhesive pattern on the pouch (10). Ultimately, these problems result in poor adhesion and poor product quality.

[0054] Therefore, the purpose of the application device (100) according to one embodiment of the present invention is to solve the above-described problem and improve the quality of the product through a cleaning process for removing foreign substances from the discharge port (121) that discharges the adhesive (170) in the manufacturing process of applying the adhesive (170) to the pouch (10).

[0055] To this end, the application device (100) according to one embodiment of the present invention can remove foreign substances remaining in the discharge port (121) by spraying compressed air (111) toward the outer circumference of the discharge port (121) through a plurality of air holes (122) formed around the discharge port (121). Furthermore, the adhesive (170) sprayed from the discharge port (121) through the compressed air (111) sprayed through the plurality of air holes (122) can be applied to the pouch (10) while forming a uniform adhesive pattern.

[0056] Referring to FIG. 4, in the application device (100) according to one embodiment of the present invention, the driving unit (130) may play a role in moving a pair of nozzle units (120) to be positioned at a reference position (150) off one side of the pouch (10) and an application position (160) spaced apart from one side of the pouch (10) by a predetermined distance.

[0057] Here, the driving unit (130) can control the pressure of the compressed air (111) supplied when the pair of nozzle units (120) are positioned at the application position (160) to be higher than the pressure of the compressed air (111) supplied when the pair of nozzle units (120) are positioned at the reference position (150).

[0058] This is to remove foreign substances remaining in the discharge port (121) by spraying compressed air (111) toward the outer surface of the discharge port (121) through a plurality of air holes (122) when a pair of nozzle parts (120) is positioned at a reference position (150). In addition, in order to efficiently remove foreign substances remaining in the discharge port (121), high-pressure compressed air (111) can be sprayed when a pair of nozzle parts (120) is positioned at a reference position (150). For example, the pressure of the compressed air (111) supplied through a plurality of air holes (122) may be 5 bar or more.

[0059] In addition, in order to efficiently remove foreign substances remaining in the discharge port (121), compressed air (111) can be heated and sprayed at a high temperature toward the outer surface of the discharge port (121). That is, by spraying high-temperature, high-pressure compressed air (111) toward the outer surface of the discharge port (121), foreign substances remaining in the discharge port (121) can be efficiently removed.

[0060] And when a pair of nozzle parts (120) are positioned at the application position (160), compressed air (111) is sprayed through a plurality of air holes (122) so that the adhesive (170) discharged from the discharge port (121) can be applied to the pouch (10) while forming a uniform adhesive pattern.

[0061] To this end, a pair of nozzles (120) can spray low-pressure compressed air (111) when positioned at the application location (160). For example, the pressure of the compressed air (111) supplied through the plurality of air holes (122) may be 0.6 bar or more and 1.0 bar or less. This is because, in order to form a uniform adhesive pattern when applying the adhesive (170), it is advantageous for the spray pressure of the compressed air (111) to be low rather than high.

[0062] Therefore, in order to uniformly apply the adhesive (170) to the pouch (10) by maintaining the injection pressure of the compressed air (111) at a low pressure, the application device (100) according to one embodiment of the present invention may be provided with a pair of nozzle parts (120). Here, the discharge port (121) of the pair of nozzle parts (120) includes a tapered shape in which the diameter decreases toward one side, and a plurality of air holes (122) may be formed on an inclined surface (123) extending from the other side of the discharge port (121).

[0063] At this time, the diameter (d2) of the plurality of air holes (122) may be 0.305 mm or more and 0.762 mm or less. This is a larger value than the diameter of the hole formed in a general nozzle. That is, by forming the diameter (d2) of the plurality of air holes (122) large, the injection pressure of the compressed air (111) can be maintained at a low pressure when applying the adhesive (170), thereby forming a uniform adhesive pattern on the pouch (10).

[0064] In addition, in order to efficiently apply the adhesive (170) while maintaining the injection pressure of the compressed air (111) at a low pressure in the application device (100) according to one embodiment of the present invention, the number of air holes (122) may be 7 or more and 11 or less. This is a larger number than the number of holes formed in a general nozzle. Through this, the number of air holes (122) formed around the discharge port (121) can be increased, thereby maintaining the injection pressure of the compressed air (111) at a low pressure, and thereby forming a uniform adhesive pattern on the pouch (10).

[0065] And as described above, the application device (100) according to one embodiment of the present invention can spray low-pressure compressed air (111) to form a uniform adhesive pattern when applying the adhesive (170). And, in order to efficiently form the adhesive pattern while spraying low-pressure compressed air (111), it can be equipped with a pair of nozzle parts (120) rather than one nozzle.

[0066] At this time, in order to minimize the phenomenon of overlapping between adhesives (170) discharged from the discharge ports (121) of a pair of nozzle parts (120), in the application device (100) according to one embodiment of the present invention, a pair of nozzle parts (120) may be spaced apart so that the gap (d1) between the discharge ports (121) is 12 mm or more and 13 mm or less.

[0067] In addition, as illustrated in FIG. 4, the application position (160) in the application device (100) according to one embodiment of the present invention may include a first application position (160a) and a second application position (160b). In this case, a pair of nozzle units (120) may move from a reference position (150) to the first application position (160a), and then apply adhesive (170) to the second application position (160b) while moving in the direction of the arrow. Then, the nozzle units may move back to the reference position (150).

[0068] In addition, in the application device (100) according to one embodiment of the present invention, the driving unit (130) can maintain the pressure of the compressed air (111) supplied when the pair of nozzle units (120) move from the reference position (150) to the application position (160) and from the application position (160) to the reference position (150). This may be an auxiliary process to prevent foreign substances from remaining in the discharge port (121) during the movement of the pair of nozzle units (120). Therefore, in this case, the pressure of the compressed air (111) maintained may be 0.6 bar or more and 1.0 bar or less as described above.

[0069] Referring to FIG. 5, in the application device (100) according to one embodiment of the present invention, the driving unit (130) can adjust the distance (d3) spaced apart from one side of the pouch (10) when a pair of nozzle units (120) are positioned at the application position (160). This is to form a uniform adhesive pattern when applying the adhesive (170).

[0070] For example, if a pair of nozzle parts (120) are spaced apart from one side of the pouch (10) at a large distance (d3), there is a problem that the adhesive pattern overlaps when applying the adhesive (170), and in the opposite case, a problem that a uniform adhesive pattern is not formed, such as the adhesive (170) clumping or having an uneven thickness, may occur.

[0071] Therefore, the application device (100) according to one embodiment of the present invention can form a uniform adhesive pattern when applying the adhesive (170) by adjusting the distance (d3) between a pair of nozzle parts (120) on one side of the pouch (10) through the driving part (130).

[0072] In addition, a pouch on which adhesive (170) is applied is sensed through a separate sensor to sense whether the adhesive pattern is formed uniformly, and based on the sensed result data, a gap (d3) between a pair of nozzle parts (120) on one side of the pouch (10) can be adjusted through a driving part (130).

[0073] And referring to FIG. 6, the application device (100) according to one embodiment of the present invention can form a uniform adhesive pattern by applying an adhesive (170) to a pouch (10) through a pair of nozzle parts (120). For example, the width (w) of the adhesive (170) applied through a pair of nozzle parts (120) can be 20 mm. And this can be a value of an adhesive pattern optimized for bonding a plurality of pouches (10) with an adhesive.

[0074] Figure 7 is a drawing for explaining a coating method according to one embodiment of the present invention.

[0075] Hereinafter, reference will be made to FIGS. 1 to 6 described above to explain a coating method according to one embodiment of the present invention.

[0076] First, when a pair of nozzle parts (120) are positioned at a reference position (150) off one side of the pouch (10), compressed air (111) can be sprayed toward the outer surface of the discharge port (121) through a plurality of air holes (122) for discharging adhesive (170) (S110). This is to remove foreign substances remaining in the discharge port (121) for discharging adhesive (170) and to clean the discharge port (121).

[0077] In order to efficiently remove foreign substances remaining in the discharge port (121), a pair of nozzle parts (120) can spray high-pressure compressed air (111) when positioned at a reference position (150). For example, the pressure of the compressed air (111) supplied through a plurality of air holes (122) can be 5 bar or more.

[0078] In addition, in order to efficiently remove foreign substances remaining in the discharge port (121), compressed air (111) can be heated and sprayed at a high temperature toward the outer surface of the discharge port (121). That is, by spraying high-temperature, high-pressure compressed air (111) toward the outer surface of the discharge port (121), foreign substances remaining in the discharge port (121) can be efficiently removed.

[0079] Thereafter, the spraying of compressed air (111) continues, and a pair of nozzle parts (120) can be moved to be positioned at a spraying position (160) spaced apart from one side of the pouch (10) at a predetermined interval (S120). At this time, the continued spraying of compressed air (111) through a plurality of air holes (122) may be an auxiliary process to prevent foreign substances from remaining in the discharge port (121) during the movement of the pair of nozzle parts (120). Accordingly, low-pressure compressed air (111) can be sprayed through a plurality of air holes (122).

[0080] And, compressed air (111) is sprayed through a plurality of air holes (122), and adhesive (170) can be applied to one surface of the pouch (10) through the discharge port (121) (S130). When a pair of nozzle parts (120) are positioned at the application position (160), compressed air (111) is sprayed through a plurality of air holes (122) so that the adhesive (170) discharged from the discharge port (121) can be applied to the pouch (10) while forming a uniform adhesive pattern.

[0081] To this end, a pair of nozzles (120) can spray low-pressure compressed air (111) when positioned at the application location (160). For example, the pressure of the compressed air (111) sprayed through the plurality of air holes (122) may be 0.6 bar or more and 1.0 bar or less. This is because, in order to form a uniform adhesive pattern when applying the adhesive (170), it is advantageous for the spray pressure of the compressed air (111) to be low rather than high.

[0082] Thereafter, the injection of compressed air (111) continues, and a pair of nozzle parts (120) can be positioned to be located at a reference position (150) (S140). At this time, the continuous injection of compressed air (111) through a plurality of air holes (122) may be an auxiliary process to prevent foreign substances from remaining in the discharge port (121) during the movement of a pair of nozzle parts (120), as described above.

[0083] And by repeating the above-described processes, the adhesive (170) can be applied to the pouch (10) through a pair of nozzle parts (120) so that a uniform adhesive pattern is formed while the foreign substances remaining in the discharge port (121) are removed.

[0084] In summary of the above, the coating device (100) and coating method according to the present invention can remove foreign substances from the discharge port (121) that discharges the adhesive (170) when applying the adhesive (170) to a pouch (10) that accommodates an electrode assembly in a secondary battery manufacturing process. In addition, when applying the adhesive (170) to the pouch (10), the scattering of foreign substances from the discharge port (121) can be minimized, and a uniform adhesive pattern can be formed, thereby improving the quality of the product.

[0085] The above detailed description should not be construed as limiting in any respect and should be considered illustrative only. The scope of the present invention should be determined by a reasonable interpretation of the appended claims, and all modifications within the equivalent scope of the present invention are intended to be included within the scope of the present invention.

Claims

1. In a coating device for applying an adhesive to a pouch that accommodates an electrode assembly, A supply unit that generates and supplies compressed air; A pair of nozzles arranged at a predetermined interval and including a discharge port for discharging adhesive; and It includes a driving unit that moves the pair of nozzle units and controls the supply unit, The above pair of nozzle parts are, It is formed around the discharge port and includes a plurality of air holes that spray compressed air supplied from the supply unit toward the outer surface of the discharge port. The above driving part, A coating device that controls the pressure of compressed air supplied to the plurality of air holes according to the positions of the pair of nozzle parts.

2. In paragraph 1, The above driving part, A coating device characterized in that the pair of nozzle parts are moved to a reference position off one side of the pouch and an coating position spaced apart from one side of the pouch by a predetermined interval.

3. In paragraph 2, The above driving part, An application device characterized in that the pressure of the compressed air supplied when the pair of nozzle parts are positioned at the reference position is controlled to be higher than the pressure of the compressed air supplied when the pair of nozzle parts are positioned at the application position.

4. In paragraph 3, An application device characterized in that the pressure of compressed air supplied when the pair of nozzles is positioned at the application position is 0.6 bar or more and 1.0 bar or less.

5. In paragraph 4, The above driving part, A coating device characterized in that the pressure of the compressed air supplied is controlled to be maintained when the pair of nozzle parts move from the reference position to the coating position and from the coating position to the reference position.

6. In paragraph 3, An application device characterized in that the pressure of the compressed air supplied when the pair of nozzle parts are positioned at the reference position is 5 bar or more.

7. In paragraph 2, The above driving part, A dispensing device characterized in that the above pair of nozzle parts adjusts the spacing from one side of the pouch when positioned at the dispensing position.

8. In paragraph 2, The above driving part, An application device characterized in that when the pair of nozzle parts are positioned at the application position, compressed air is sprayed through the plurality of air holes and the adhesive is applied to one surface of the pouch through the discharge port.

9. In paragraph 1, The above outlet is, It includes a tapered shape in which the diameter decreases as it goes toward one side. The above multiple air holes are, A coating device characterized in that it is formed on a slope extending from the other side of the above discharge port.

10. In paragraph 9, A coating device characterized in that the diameter of the plurality of air holes is 0.305 mm or more and 0.762 mm or less.

11. In paragraph 9, A coating device characterized in that the number of the plurality of air holes is 7 or more and 11 or less.

12. In paragraph 1, The above pair of nozzle parts are, A coating device characterized in that the spacing between the above discharge ports is 12 mm or more and 13 mm or less.

13. In a method of applying an adhesive to a pouch that accommodates an electrode assembly, A step of spraying compressed air toward the outer surface of a discharge port that discharges adhesive through a plurality of air holes when a pair of nozzle parts are positioned at a reference position off one side of the pouch; A step in which the pair of nozzle parts are positioned at application positions spaced apart at a predetermined interval on one side of the pouch; A step of spraying compressed air through the plurality of air holes and applying adhesive to one surface of the pouch through the outlet; and A coating method comprising a step of positioning the pair of nozzle parts at the reference position.

14. In paragraph 12, A coating method characterized in that the pressure of the compressed air sprayed when the pair of nozzle parts are positioned at the application position is higher than the pressure of the compressed air sprayed when the pair of nozzle parts are positioned at the reference position.

15. In paragraph 13, A coating method characterized in that the pressure of the compressed air sprayed when the pair of nozzle parts moves from the reference position to the coating position and from the coating position to the reference position is maintained.

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