Intermittent valve and intermittent coating device

Abstract

The intermittent valve includes: a valve body having a flow-in chamber, a supply chamber, and a return chamber in the inside, the flow-in chamber having an upstream end, a first downstream end, and a second downstream end, and a tank connected to the upstream end, the supply chamber connected to the first downstream end and a mold, and the return chamber connected to the second downstream end and the tank; a piston capable of switching between a first position and a second position in the valve body; a supply valve allowing the flow of paint from the flow-in chamber to the supply chamber when the piston is in the first position, and cutting off the flow when the piston is in the second position; and a return valve cutting off the flow of paint from the flow-in chamber to the return chamber when the piston is in the first position, and allowing the flow when the piston is in the second position. The valve diameter (D1) of the supply valve is 1.53 times or more of the valve diameter (D2) of the return valve.

Description

[0001] This application is a divisional application of patent application No. 2020800304867, filed on April 24, 2020, for Intermittent Valve and Intermittent Coating Apparatus. TECHNICAL FIELD

[0002] The present application relates to an intermittent valve and an intermittent coating apparatus. BACKGROUND

[0003] In recent years, with the popularization of electric vehicles (EVs), hybrid vehicles (HVs), plug-in hybrid vehicles (PHVs), and the like, the shipment of secondary batteries has increased. In particular, the shipment of lithium-ion secondary batteries has increased. A general secondary electrode has a positive electrode plate, a negative electrode plate, a separator, and an electrolyte as main constituent elements. The electrode plate such as the positive electrode plate has a configuration in which an electrode active material is layered on the surface of a current collector composed of a metal foil.

[0004] In the past, as a method of manufacturing such an electrode plate, a method of intermittently coating an electrode slurry on the surface of a long metal foil using an intermittent coating apparatus including a die that ejects an electrode slurry in which an active material and a solvent are mixed and an intermittent valve that switches the supply and non-supply of the electrode slurry to the die has been known (for example, refer to Patent Literature 1).

[0005] [Patent Literature]

[0006] [Patent Literature]

[0007] Patent Literature 1: Japanese Patent Application Publication No. 2006-51407 SUMMARY

[0008] In order to achieve the improvement in the quality of secondary batteries, it is of course required to improve the coating accuracy of the electrode slurry in intermittent coating. On the other hand, with the increase in the shipment of secondary batteries, there is a demand for shortening the manufacturing time of electrode plates. However, if the electrode slurry is intermittently coated at high speed on a metal foil in order to shorten the manufacturing time of electrode plates, the coating accuracy of the electrode slurry can possibly decrease.

[0009] The present application has been achieved in view of the above circumstances, and aims to provide a technology of improving the coating accuracy of a coating material in intermittent coating.

[0010] One aspect of the present application is an intermittent valve that switches supply and non-supply of paint to a mold that applies paint to a coated body from a tank that stores the paint. The intermittent valve includes: a valve body that has, inside, a flow-in chamber having an upstream end, a first downstream end, and a second downstream end, a supply chamber connected to the first downstream end and the mold, and a return chamber connected to the second downstream end and the tank; a piston that can switch between a first position and a second position inside the valve body; a supply valve fixed to the piston that allows flow of the paint from the flow-in chamber to the supply chamber when the piston is in the first position and cuts off the flow when the piston is in the second position; and a return valve fixed to the piston that cuts off flow of the paint from the flow-in chamber to the return chamber when the piston is in the first position and allows the flow when the piston is in the second position, the valve diameter of the supply valve being 1.53 times or more the valve diameter of the return valve.

[0011] Another aspect of the present application is an intermittent coating device. The intermittent coating device includes: a tank that stores paint; a mold that applies the paint to a coated body; and the above aspect of the intermittent valve that switches supply and non-supply of the paint to the mold.

[0012] Furthermore, any combination of the above constituent elements, and aspects of the present application that convert the aspects of the present application between a method, a device, a system, and the like are also effective as aspects of the present application.

[0013] According to the present application, it is possible to improve the coating accuracy of paint in intermittent coating. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a schematic view of an intermittent coating device of an embodiment.

[0015] Figure 2 is a cross-sectional view that schematically represents an intermittent valve.

[0016] [EXPLANATION OF REFERENCE NUMERALS]

[0017] 1 intermittent coating device

[0018] 2 mold

[0019] 4 intermittent valve

[0020] 6 tank

[0021] 16 coated body

[0022] 18 paint

[0023] 22 valve body

[0024] 22a second planar portion

[0025] 24 piston

[0026] 26 supply valve

[0027] 26a first plane portion

[0028] 28 backflow valve

[0029] 38 inflow chamber

[0030] 38a upstream end

[0031] 38b first downstream end

[0032] 38c second downstream end

[0033] 40 supply chamber

[0034] 42 return chamber DETAILED DESCRIPTION

[0035] Hereinafter, the present application will be described based on preferred embodiments with reference to the accompanying drawings. The embodiments do not limit the present application but exemplify, and all the features described in the embodiments and combinations thereof are not essential to the present application. Identical or equivalent constituent elements, members, and processes shown in the respective drawings are designated by the same reference numerals, and repeated explanation is appropriately omitted. In addition, the scale and shape of each part shown in each drawing are conveniently set for easy explanation, and are not limited unless specifically mentioned. In addition, in the case where the terms "first", "second", and the like are used in the present specification or claims, the terms do not indicate any order or importance unless specifically mentioned, but are used as terms for distinguishing certain constituents from other constituents. In addition, in the respective drawings, a part of unimportant members is omitted from the explanation of the embodiments.

[0036] Figure 1 is a schematic view of an intermittent coating device of the embodiment. The intermittent coating device 1 includes a die 2, an intermittent valve 4, a tank 6, a pump 8, a delivery line 10, a return line 12, and a die supply line 14.

[0037] The die 2 is an instrument that coats a coating material 18 on a coated body 16. The intermittent coating device 1 of the embodiment is used for the manufacture of an electrode plate of a secondary battery. The electrode plate of a secondary battery is a sheet-like electrode material that coats an electrode slurry on a current collector and dries it. Therefore, in the embodiment, the coated body 16 is a current collector of a secondary battery, and the coating material 18 is an electrode slurry of a secondary battery. The current collector is, for example, a metal foil. The electrode slurry is, for example, a mixture of a positive electrode active material or a negative electrode active material and a solvent. In the case of a general lithium ion secondary battery, the electrode plate of the positive electrode is produced by coating a slurry containing a positive electrode active material such as lithium cobaltate, lithium iron phosphate, or the like on an aluminum foil. In addition, the electrode plate of the negative electrode is produced by coating a slurry containing a negative electrode active material such as graphite on a copper foil.

[0038] The mold 2 is disposed so that the nozzle 84 is opposed to the peripheral surface of the support roller 20 at a prescribed interval. The coated body 16 is continuously conveyed to a position where the support roller 20 and the nozzle 84 are opposed to each other by rotation of the support roller 20.

[0039] A shut-off valve 4 is connected to the mold 2 via the mold supply line 14. The shut-off valve 4 is a mechanism that switches supply and non-supply of the paint 18 to the mold 2. The intermittent coating device 1 can eject the paint 18 from the mold 2 to the coated body 16 during supply of the paint 18 to the mold 2. The tank 6 is connected to the shut-off valve 4 via the delivery line 10 and the return line 12.

[0040] The tank 6 stores the paint 18. A pump 8 is provided in the delivery line 10, and the paint 18 is delivered from the tank 6 to the shut-off valve 4 by driving of the pump 8. The shut-off valve 4 supplies the paint 18 supplied from the tank 6 to the mold 2 via the mold supply line 14. Alternatively, the shut-off valve 4 returns the paint 18 supplied from the tank 6 to the tank 6 via the return line 12.

[0041] By supplying the paint 18 to the mold 2 by the shut-off valve 4, the paint 18 can be ejected from the mold 2 to form a coated portion 18a of the paint 18 on the coated body 16. In addition, the shut-off valve 4 returns the paint 18 to the tank 6, whereby ejection of the paint 18 from the mold 2 can be stopped to form an uncoated portion 16a of the paint 18 on the coated body 16. That is, by the shut-off valve 4, the coated body 16 can be intermittently coated with the paint 18. The uncoated portion 16a is used for sticking of a center lead wire of an electrode or the like.

[0042] Figure 2 is a cross-sectional view schematically showing the shut-off valve 4. The shut-off valve 4 includes a valve body 22, a piston 24, a supply valve 26, and a return valve 28. The valve body 22 is a so-called cylinder having a first opening 30 in an upper surface through which the piston 24 is slidably inserted, a second opening 32 in a side surface connected to the delivery line 10, a third opening 34 connected to the return line 12, and a fourth opening 36 connected to the supply line 14. Further, in the description of the present embodiment, for convenience, the first opening is provided in the upper surface, and the second opening 32 to the fourth opening 36 are provided in the side surface, but the form of the shut-off valve 4 is not particularly limited.

[0043] In addition, the valve body 22 has a flow-in chamber 38, a supply chamber 40, and a return chamber 42 in the inside. The flow-in chamber 38 is a substantially T-shaped chamber branched into two at one end side, and has an upstream end 38a, a first downstream end 38b, and a second downstream end 38c. The delivery line 10 is connected to the upstream end 38a via the second opening 32. That is, the upstream end 38a is connected to the tank 6. The paint 18 flows into the flow-in chamber 38 from the upstream end 38a, and flows to the first downstream end 38b and the second downstream end 38c in the flow-in chamber 38.

[0044] The supply chamber 40 is connected at the first downstream end 38b. The supply chamber 40 is connected to the mold supply line 14 via the fourth opening 36. That is, the supply chamber 40 is connected to the mold 2. The paint 18 flowing in the inflow chamber 38 and reaching the first downstream end 38b flows to the mold 2 via the supply chamber 40 and the mold supply line 14. Thus, the inflow chamber 38 and the supply chamber 40 constitute a part of the flow path of the paint 18 connecting the tank 6 and the mold 2.

[0045] The return chamber 42 is connected at the second downstream end 38c. The return chamber 42 is connected to the return line 12 via the third opening 34. That is, the return chamber 42 is connected to the tank 6. The paint 18 flowing in the inflow chamber 38 and reaching the second downstream end 38c flows to the tank 6 via the return chamber 42 and the return line 12. Thus, the inflow chamber 38 and the return chamber 42 constitute a part of the flow path of the paint 18 circulating between the tank 6 and the intermittent valve 4.

[0046] The first opening 30 of the valve body 22, the first joint portion 44 at which the first downstream end 38b and the supply chamber 40 are joined, and the second joint portion 46 at which the second downstream end 38c and the return chamber 42 are joined are arranged in a straight line. The first opening 30, the second joint portion 46, and the first joint portion 44 are arranged in this order. The piston 24 is a rod-like member, one end side of which is inserted through the first opening 30, the second joint portion 46, and the first joint portion 44.

[0047] The supply valve 26 is fixed in the vicinity of the first joint portion 44 of the piston 24. The return valve 28 is fixed in the vicinity of the second joint portion 46 of the piston 24. The supply valve 26 and the return valve 28 are arranged at a larger interval in the axial direction X (the direction in which the axis of the piston 24 extends) than the interval between the first joint portion 44 and the second joint portion 46. The supply valve 26, the return valve 28, the opening of the first joint portion 44, and the opening of the second joint portion 46 of the present embodiment are each circular as viewed in the axial direction X.

[0048] The piston 24 is displaced in the axial direction X with respect to the valve body 22, whereby the first position and the second position can be switched in the valve body 22. The piston 24 is said to be in the first position when it is further inside the valve body 22 than when it is in the second position, and is said to be in the second position when it is further outside the valve body 22 than when it is in the first position. Figure 2 The piston 24, the supply valve 26, and the return valve 28 in the second position are shown in solid lines. In addition, the supply valve 26 and the return valve 28 when the piston 24 is in the first position are shown in broken lines.

[0049] When the piston 24 is in the first position, a gap is formed between the supply valve 26 and the first connecting portion 44, and the inflow chamber 38 is communicated with the supply chamber 40. On the other hand, when the piston 24 is in the second position, the supply valve 26 is fitted in the first connecting portion 44, and the inflow chamber 38 is cut off from the supply chamber 40. Therefore, the supply valve 26 allows the flow of the paint 18 from the inflow chamber 38 to the supply chamber 40 when the piston 24 is in the first position, and cuts off the flow of the paint 18 from the inflow chamber 38 to the supply chamber 40 when the piston 24 is in the second position.

[0050] In addition, when the piston 24 is in the first position, the return valve 28 is fitted in the second connecting portion 46, and the inflow chamber 38 is cut off from the return chamber 42. On the other hand, when the piston 24 is in the second position, a gap is formed between the return valve 28 and the second connecting portion 46, and the inflow chamber 38 is communicated with the return chamber 42. Therefore, the return valve 28 cuts off the flow of the paint 18 from the inflow chamber 38 to the return chamber 42 when the piston 24 is in the first position, and allows the flow of the paint 18 from the inflow chamber 38 to the return chamber 42 when the piston 24 is in the second position.

[0051] Therefore, the intermittent valve 4 is in the first state in which the paint 18 is supplied to the mold 2 when the piston 24 is in the first position, and is in the second state in which the supply of the paint 18 to the mold 2 is stopped when the piston 24 is in the second position. Specifically, when the intermittent valve 4 is in the first state, the piston 24 is in the first position, and therefore the inflow chamber 38 is communicated with the supply chamber 40, and the inflow chamber 38 is cut off from the return chamber 42. Therefore, the paint 18 flowing into the inflow chamber 38 from the delivery line 10 is supplied to the mold 2 via the supply chamber 40 and the mold supply line 14. On the other hand, when the intermittent valve 4 is in the second state, the piston 24 is in the second position, and therefore the inflow chamber 38 is cut off from the supply chamber 40, and the inflow chamber 38 is communicated with the return chamber 42. Therefore, the paint 18 flowing into the inflow chamber 38 from the delivery line 10 is returned to the tank 6 via the return chamber 42 and the return line 12.

[0052] The piston 24 switches the first position and the second position by a driving portion (not shown) connected to an end portion protruding outward from the valve main body 22. The driving portion is constituted by an electric motor such as a servo motor, a crank mechanism or the like connecting the electric motor and the piston 24. In addition, the driving portion can be a publicly known driving source other than the electric motor such as a cylinder.

[0053] When the piston 24 is displaced from the first position to the second position, it moves in a direction to exit from the supply chamber 40. Therefore, the volume of the portion of the piston 24 located in the supply chamber 40 decreases. Thereby, the inside of the supply chamber 40 becomes under pressure, and a portion of the paint 18 is drawn back from the die 2. In addition, when the supply valve 26 is displaced toward the first connecting portion 44 as the piston 24 is displaced, a portion of the paint 18 is introduced to the inflow chamber 38 side through the supply valve 26. Thereby, a portion of the paint 18 is also drawn back from the die 2. By this backflow of the paint 18, when the ejection of the paint 18 from the die 2 is stopped, the dripping of the paint 18 from the ejection port 84 can be suppressed. That is, a back suction effect can be obtained.

[0054] In the present embodiment, the size of the supply valve 26 is larger than that of the backflow valve 28. Specifically, the valve diameter Dl of the supply valve 26 is 1.53 times or more the valve diameter D2 of the backflow valve 28. That is, the ratio of the valve diameter Dl of the supply valve 26 to the valve diameter D2 of the backflow valve 28 (Dl / D2: hereinafter, this ratio will be referred to as the valve diameter ratio) is 1.53 or more. In addition, the valve diameter ratio is preferably 1.81 or more, and more preferably 2.00 or more. In the present embodiment, the valve diameters Dl, D2 of the valves are the sizes of the portions where the dimensions in the directions orthogonal to the axial direction X of the piston 24 are the largest.

[0055] By setting the sizes of the supply valve 26 and the backflow valve 28 in such a manner that the valve diameter ratio is 1.53 or more, the amount of the paint 18 drawn back from the die 2 by the back suction effect (hereinafter, this amount will be referred to as the back suction amount) can be increased, and the paint 18 can be prevented from being scattered to the uncoated portion 16a.

[0056] The present inventors and others implemented intermittent coating using the intermittent valve of the reference example whose valve diameter ratio was about 1.52 and the intermittent valve 4 of the embodiment whose valve diameter ratio was 2.00, respectively. And, according to the reference example and the embodiment, the amount (area) of the paint 18 scattered to the uncoated portion 16a was measured by a known image analysis, and the both were compared. As a result, when the amount of the paint 18 scattered to the uncoated portion 16a in the reference example was set to 1, it was confirmed that the amount of the paint 18 scattered in the embodiment was reduced to 0.67.

[0057] Further, the inventors et al. performed intermittent coating by setting the flow rate of the paint to 3.2 L / min using the intermittent valve of the reference example. Further, the inventors et al. performed intermittent coating by setting the flow rate of the paint to 4.0 L / min using the intermittent valve 4 of the embodiment. As a result, in the intermittent coating using the intermittent valve of the reference example, scattering of the paint 18 to the uncoated portion 16 was observed. On the other hand, in the intermittent coating using the intermittent valve 4 of the embodiment, although the flow rate was increased, the amount of scattering of the paint 18 was confirmed to be reduced as compared with the reference example. Further, the amount of back suction in the intermittent valve of the reference example was 0.17 mL, and the amount of back suction in the intermittent valve 4 of the embodiment was 0.22 mL.

[0058] Generally, if the flow rate of the paint 18 is increased, the resistance to displacement of the piston 24 from the first position to the second position is increased. Therefore, it is difficult for the supply valve 26 to close, and the paint 18 is easily scattered to the uncoated portion 16a. Despite this tendency, according to the present embodiment, it is possible to increase the amount of back suction and suppress scattering of the paint 18 to the uncoated portion 16. Further, the inventors et al. recognized that at least increasing the valve diameter ratio as compared with the reference example, that is, if the valve diameter ratio is set to 1.53 or more, it is possible to achieve an increase in the amount of back suction and suppression of scattering of the paint 18.

[0059] Further, the supply valve 26 of the present embodiment has a first flat portion 26a extending in a direction orthogonal to the axial direction X of the piston 24 on a surface toward the first downstream end 38b. Further, the valve body 22 has a second flat portion 22a that comes into surface contact with the first flat portion 26a when the piston 24 is in the second position. The first flat portion 26a and the second flat portion 22a are located outside the first downstream end 38b as viewed in the axial direction X. Further, the first flat portion 26a faces upward, and the second flat portion 22a faces downward, and they face each other.

[0060] By providing the first flat portion 26a, it is possible to introduce more paint 18 to the inflow chamber 38 side when the piston 24 is displaced from the first position to the second position. Thereby, it is possible to more reliably increase the amount of back suction. Further, in a state where the piston 24 is in the second position, by the first flat portion 26a and the second flat portion 22a coming into surface contact, it is possible to suppress leakage of the paint 18 from the inflow chamber 38 to the supply chamber 40.

[0061] Further, when the piston 24 is displaced from the second position to the first position, a narrow (and thus, a large flow path resistance) flow path is formed on the outer periphery of the first downstream end 38b by the first flat portion 26a and the second flat portion 22a. Thus, at the instant when the piston 24 is displaced from the second position to the first position, the flow of a large amount of the paint 18 from the inflow chamber 38 to the supply chamber 40 can be suppressed. Further, when the piston 24 is displaced from the second position to the first position, the hydraulic pressure of the paint 18 flowing from the inflow chamber 38 to the supply chamber 40 can be received by the first flat portion 26a. Thus, the supply valve 26 can follow the displacement of the piston 24 with higher accuracy. As a result, the supply and non-supply of the paint 18 to the mold 2 can be switched with higher accuracy.

[0062] Further, the supply valve 26 has a convex portion 26b protruding toward the first downstream end 38b in a region of the face toward the first downstream end 38b side on the piston 24 side from the first flat portion 26a. In a state where the piston 24 is in the second position, the convex portion 26b is embedded in the first downstream end 38b. Thus, the outflow of the paint 18 from the inflow chamber 38 to the supply chamber 40 can be further suppressed.

[0063] Further, the supply valve 26 has a tapered portion 26c in an outer edge portion of the face toward the first downstream end 38b side, the tapered portion 26c being inclined in a direction orthogonal to the axial direction X in such a manner as to separate from the second flat portion 22a as it goes toward the outside of the supply valve 26. In the intermittent valve 4 of the present embodiment, the height positions of the second opening 32 and the fourth opening 36 are substantially identical. Thus, after the supply chamber 40 extends in the horizontal direction from the first connecting portion 44, it extends upward at a position offset from the piston 24 to be connected to the fourth opening 36. Thus, if the valve diameter Dl of the supply valve 26 is increased, the outer edge portion of the supply valve 26 protrudes toward the center side of the supply chamber 40 at the portion where the supply chamber 40 is bent from the horizontal direction to the vertical direction, and it can be possible to hinder the flow of the paint 18. In contrast, by providing the tapered portion 26c, it is possible to reduce the case where the flow of the paint 18 in the supply chamber 40 is hindered by the supply valve 26.

[0064] As explained above, the intermittent valve 4 of the present embodiment is a mechanism that switches the supply and non-supply of the paint 18 to the die 2 that applies the paint 18 to the coated body 16 from the tank 6 that stores the paint 18. The intermittent valve 4 includes a valve body 22, a piston 24, a supply valve 26, and a return valve 28. The valve body 22 has a flow-in chamber 38 having an upstream end 38a, a first downstream end 38b, and a second downstream end 38c, a supply chamber 40, and a return chamber 42 inside. The tank 6 is connected to the upstream end 38a, the supply chamber 40 is connected to the first downstream end 38b and the die 2, and the return chamber 42 is connected to the second downstream end 38c and the tank 6. The piston 24 is able to switch between a first position and a second position inside the valve body 22. The supply valve 26 is fixed to the piston 24, and allows the flow of the paint 18 from the flow-in chamber 38 to the supply chamber 40 when the piston 24 is in the first position, and cuts off the flow when the piston 24 is in the second position. The return valve 28 is fixed to the piston 24, and cuts off the flow of the paint 18 from the flow-in chamber 38 to the return chamber 42 when the piston 24 is in the first position, and allows the flow when the piston 24 is in the second position. The valve diameter Dl of the supply valve 26 is set to be 1.53 times or more the valve diameter D2 of the return valve 28.

[0065] By setting the valve diameter Dl of the supply valve 26 to be 1.53 times or more the valve diameter D2 of the return valve 28, the amount of the paint 18 sucked back when the piston 24 is displaced from the first position to the second position can be increased, and the scattering of the paint 18 to the uncoated portion 16a can be suppressed. Thus, the configuration of the intermittent valve 4 and the intermittent coating device 1 is not complicated, and the coating accuracy of the paint 18 can be improved. In addition, the coating accuracy of the paint 18 can be maintained, and the speed of the intermittent coating can be increased. Therefore, according to the present embodiment, the reduction of the manufacturing time of the electrode plate and the maintenance of the quality can be achieved.

[0066] In addition, the supply valve 26 of the present embodiment has a first flat surface portion 26a on the surface toward the first downstream end 38b that extends in a direction orthogonal to the axial direction X of the piston 24. In addition, the valve body 22 has a second flat surface portion 22a that comes into contact with the first flat surface portion 26a when the piston 24 is in the second position. By the supply valve 26 having the first flat surface portion 26a, the amount of the paint 18 sucked back can be more reliably increased. Thus, the coating accuracy of the paint 18 can be further improved. In addition, by the first flat surface portion 26a and the second flat surface portion 22a, the leakage of the paint 18 from the flow-in chamber 38 to the supply chamber 40 can be suppressed. Thus, the coating accuracy of the paint 18 can be further improved.

[0067] Further, by the first flat portion 26a and the second flat portion 22a, the flow of the paint 18 can be suppressed from instantaneously increasing at the time of opening of the supply valve 26. Thus, at the time of switching of the intermittent valve 4 from the second state to the first state, the amount of ejection of the paint 18 from the mold 2 can be suppressed from sharply increasing. Therefore, the film thickness of the coated portion 18a can be suppressed from increasing in the boundary region with the uncoated portion 16a, and thus the film thickness of the coated portion 18a can be made uniform.

[0068] If the film thickness of the coated portion 18a is made uniform, in the press working after the coating process of the paint 18, the press working can be more reliably performed on the entire coated portion 18a. Thus, the density of the entire coated portion 18a can be improved, or the entire coated portion 18a can be made to adhere to the coated body 16. As a result, the battery performance of the coated portion 18a can be suppressed from decreasing locally or peeling from the coated body 16. Further, by the first flat portion 26a receiving the hydraulic pressure of the paint 18 flowing from the inflow chamber 38 to the supply chamber 40, the supply valve 26 can more highly accurately follow the displacement of the piston 24. Thus, the supply and non-supply of the paint 18 to the mold 2 can be more highly accurately switched, and the coating accuracy of the paint 18 can be further improved.

[0069] The intermittent coating device 1 includes a tank 6 that stores the paint 18, a delivery line 10 and a return line 12 that connect the tank 6 and the intermittent valve 4, and a pump 8 that delivers the paint 18 from the tank 6 provided to the delivery line 10 to the intermittent valve 4. The paint 18 is returned to the pump 6 via the return line 12 when the intermittent valve 4 is in the second state. Thus, even in a state where the ejection of the paint 18 from the mold 2 is stopped, the supply of the paint 18 to the intermittent valve can be continued. Therefore, since the pump 8 can be driven at all times, the simplification of the system configuration of the intermittent coating device 1 can be achieved.

[0070] The above describes the embodiments of the present application in detail. The above-described embodiments are merely modes of embodying the present application. The contents of the embodiments are not intended to limit the technical scope of the present application, and various design changes such as changes, additions, and omissions of constituent elements can be made within the scope of the ideas set forth in the claims. The new embodiments to which the design changes are applied have the effects of the respective embodiments and modifications combined. In the above-described embodiments, the contents to which such design changes can be made are emphasized by being marked with marks such as "of the present embodiment" and "in the present embodiment", but design changes are also allowed for the contents not marked with such marks. Any combination of the above-described constituent elements is also effective as a mode of the present application. The hatching lines marked on the cross sections of the drawings do not limit the materials of the objects marked with the hatching lines.

[0071] In the embodiment, the second opening 32 coincides with the height position of the fourth opening 36, and the supply chamber 40 is bent from the first connecting portion 44 to the fourth opening 36, but the fourth opening 36 can also be positioned lower than the second opening 32, and the supply chamber 40 can also extend straight in the horizontal direction from the first connecting portion 44.

Claims

1. An intermittent valve, which switches between supplying and withholding paint to a mold, the mold applying the paint from a tank storing the paint to a workpiece. include: The valve body has an inflow chamber and a supply chamber inside. The inflow chamber has an upstream end and a first downstream end, and the tank is connected to the upstream end. The supply chamber is connected to the first downstream end and the mold. A piston capable of switching between a first position and a second position within the valve body, and A supply valve, fixed to the piston in a non-movable manner relative to the piston, allows the paint to flow from the inflow chamber to the supply chamber when the piston is in the first position, and cuts off the flow when the piston is in the second position. The supply valve has a first planar portion on its surface facing the first downstream end, extending in a direction orthogonal to the axial direction of the piston. The valve body has a second planar portion that contacts the first planar portion when the piston is in the second position. The supply chamber extends in a direction orthogonal to the axial direction of the piston, and then extends towards the axial direction of the piston at a position offset from the piston. At the location where the supply chamber bends towards the axis of the piston in a direction orthogonal to the piston's axis, the outer edge of the supply valve extends towards the center of the supply chamber. The supply valve has a tapered portion on the outer edge of the face facing the first downstream end, the tapered portion being inclined in a direction orthogonal to the axial direction of the piston, such that it separates from the second plane portion as it moves toward the outside of the supply valve.

2. The intermittent valve as claimed in claim 1, wherein, The inflow chamber also has a second downstream end, and the valve body internally has a return chamber connected to the second downstream end and the tank.

3. The intermittent valve as described in claim 2, wherein, The intermittent valve also includes a return valve fixed to the piston, which cuts off the flow of the coating from the inflow chamber to the return chamber when the piston is in the first position, and allows the flow when the piston is in the second position.

4. The intermittent valve as described in claim 3, wherein, The valve diameter of the supply valve is larger than that of the return valve.

5. The intermittent valve as described in claim 4, wherein, The valve diameter of the supply valve is more than 1.53 times the valve diameter of the return valve.

6. The intermittent valve according to any one of claims 1 to 5, wherein, The coated body is the current collector of a secondary battery; The coating is an electrode slurry for a secondary battery.

7. An intermittent coating apparatus, comprising: Tanks for storing paint, A mold for applying the coating onto the substrate, and The intermittent valve as described in any one of claims 1 to 6, which switches the supply and non-supply of the coating to the mold.

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