Gas nozzle for drying electrode plate and electrode plate drying device comprising gas nozzle

Abstract

The present disclosure provides a gas nozzle for drying an electrode plate, including: a nozzle body including a first plate, a second plate disposed spaced apart from the first plate in a first direction, and a partition plate disposed between the first plate and the second plate, the partition plate divides a flow space formed between the first plate and the second plate into a first flow space opposite to the first plate and a second flow space opposite to the second plate; at least one inflow hole formed in the first plate and configured to allow a drying gas to flow into the first flow space from outside the nozzle body; at least one communication hole formed in the partition plate and communicating the first flow space and the second flow space; and a plurality of injection holes formed in the second plate and configured to inject the drying gas of the second flow space to the outside.

Description

Technical Field

[0001] The present invention relates to a gas nozzle for drying an electrode plate and an electrode plate drying device including the gas nozzle. The electrode plate manufactured by the gas nozzle and the electrode plate drying device including the gas nozzle of the present invention can be widely used in the secondary battery technology field such as pouch-type secondary batteries and prismatic secondary batteries. Background Art

[0002] Unlike primary batteries, secondary battery cells can be charged and discharged, so they can be used in many fields such as digital cameras, mobile phones, laptops, hybrid vehicles, electric vehicles, energy storage devices, etc.

[0003] Secondary batteries are divided into pouch-type secondary batteries and can-type secondary batteries, and have a structure in which an electrode assembly and an electrolyte are contained inside a shell. The electrode assembly has a structure in which electrode plates and separators are alternately stacked. The electrode plate may include a positive plate and a negative plate. Generally, the electrode plate includes a sheet-shaped or film-shaped collector and a positive active material or a negative active material coated on the collector. For example, the negative plate may be formed by coating a negative active material on a copper sheet, and the positive plate may be formed by coating a positive active material on an aluminum sheet. The electrode plate is manufactured by a coating process in which the active material is coated on the collector and a drying process in which the active material is dried. The coating process and the drying process have a significant impact on the quality of the secondary battery.

[0004] In the drying process, the active material is dried by spraying a drying gas such as hot air onto the collector sheet coated with the active material. In the drying process, if the flow rate and / or flow velocity of the drying gas deviates greatly depending on the position of the electrode plate, the dryness and drying efficiency vary depending on the position of the electrode plate, resulting in uneven quality of the electrode plate.

[0005] In addition, if the flow rate and / or flow velocity of the drying gas vary greatly, cracks, warping, etc. may occur in the electrode plate depending on the position of the electrode plate, resulting in a decrease in the quality of the electrode plate. Summary of the invention

[0006] 1. Technical issues to be resolved

[0007] If the width of the electrode plate is narrow, the distance between the center and the two side parts of the electrode plate is short based on the width direction of the electrode plate, so the flow rate and / or flow velocity deviation between the center and the two side parts of the electrode plate may not be large. However, if the width of the electrode plate is wide, the flow rate and / or flow velocity difference between the center and the two side parts may be large based on the width direction of the electrode plate. In this case, the drying deviation in the width direction of the electrode plate will increase, and the quality of the electrode plate will decrease.

[0008] According to one aspect of the present disclosure, a gas nozzle for drying an electrode plate capable of reducing a flow rate and / or flow velocity deviation according to a position of an electrode plate and an electrode plate drying device including the gas nozzle may be provided.

[0009] According to one aspect of the present disclosure, a gas nozzle for drying an electrode plate capable of reducing a deviation in drying efficiency and drying quality according to a position of an electrode plate and an electrode plate drying device including the gas nozzle may be provided.

[0010] According to one aspect of the present disclosure, a gas nozzle for drying an electrode plate capable of improving the quality of an electrode plate even if the electrode plate has a large width and an electrode plate drying device including the gas nozzle can be provided.

[0011] The gas nozzle for drying the electrode plate and the electrode plate drying device including the gas nozzle can provide a uniform or substantially uniform gas flow rate and / or flow velocity for the entire area of ​​the electrode plate. The gas nozzle for drying the electrode plate and the electrode plate drying device show significantly improved drying efficiency and drying quality in the entire area of ​​the electrode plate, thereby improving the quality of the electrode even for large-area electrodes.

[0012] The electrode plate and the battery cell including the electrode plate manufactured by the electrode plate drying gas nozzle and the electrode plate drying device including the gas nozzle disclosed in the present invention can be widely used in electric vehicles, battery charging stations and other green technology fields such as solar power generation and wind power generation using batteries. In addition, the electrode plate and the battery cell including the electrode plate manufactured by the present invention can be used in eco-friendly electric vehicles or hybrid vehicles that prevent climate change by suppressing air pollution and greenhouse gas emissions.

[0013] (II) Technical solution

[0014] According to the present disclosure, a gas nozzle for drying an electrode plate may include: a nozzle body, including a first plate, a second plate arranged to be separated from the first plate in a first direction, and a partition plate arranged between the first plate and the second plate, the partition plate partitioning a flow space formed between the first plate and the second plate into a first flow space opposite to the first plate and a second flow space opposite to the second plate; at least one inflow hole formed in the first plate and configured to allow drying gas to flow into the first flow space from outside the nozzle body; at least one connecting hole formed in the partition plate and connecting the first flow space and the second flow space; and a plurality of injection holes formed in the second plate and configured to inject the drying gas in the second flow space to the outside.

[0015] In an embodiment, the at least one inflow hole may have a slit shape that crosses the first plate along a second direction, ie, a length direction of the nozzle body.

[0016] In an embodiment, the at least one communication hole may have a slit shape that traverses the partition plate along the second direction.

[0017] In an embodiment, the at least one communication hole may be disposed not to face the at least one inflow hole with reference to the first direction.

[0018] In an embodiment, the first plate and the partition plate may have a flat plate shape.

[0019] In an embodiment, the nozzle body may include a plurality of side plates connecting an edge of the first plate and an edge of the second plate, and the partition plate may be connected to the plurality of side plates.

[0020] In an embodiment, the partition plate may include a recessed portion recessed toward the second flow space.

[0021] In an embodiment, the recessed portion may be provided at a position facing the at least one inflow hole with reference to the first direction.

[0022] In an embodiment, the recessed portion may have a shape that crosses the partition plate along the second direction, and at least one communicating hole may be respectively provided at two sides of the recessed portion.

[0023] In an embodiment, a first height of a portion of the first flow space where the recessed portion is not provided may be smaller than a second height of a portion of the second flow space where the recessed portion is not provided.

[0024] In an embodiment, a total cross-sectional area of ​​the at least one communication hole may have a value greater than a total cross-sectional area of ​​the at least one inflow hole.

[0025] In an embodiment, the number of the at least one communication hole may be greater than the number of the at least one inflow hole.

[0026] In an embodiment, the plurality of injection holes may have a circular shape.

[0027] According to the present disclosure, the electrode plate drying device may include: a chamber, forming a gas supply space for the flow of drying gas for drying the electrode plate; and a gas nozzle, coupled to the chamber to communicate with the gas supply space of the chamber, and the multiple gas nozzles may include: a nozzle body, including a first plate, a second plate spaced apart from the first plate in a first direction, and a partition plate arranged between the first plate and the second plate, the partition plate dividing the flow space formed between the first plate and the second plate into a first flow space opposite to the first plate and a second flow space opposite to the second plate; at least one inflow hole formed in the first plate and configured to allow drying gas to flow into the first flow space from outside the nozzle body; at least one connecting hole formed in the partition plate and connecting the first flow space and the second flow space; and multiple injection holes formed in the second plate and configured to inject the drying gas in the second flow space to the outside.

[0028] In an embodiment, the plurality of gas nozzles may have a shape extending along a second direction, i.e., a width direction of the electrode plate, and may be spaced apart in a third direction, i.e., a moving direction of the electrode plate, and the first direction, the second direction and the third direction may be perpendicular to each other.

[0029] In an embodiment, the chamber may include an inlet for supplying a drying gas from outside the chamber to the gas supply space, and the inlet may be configured to supply the drying gas in the second direction.

[0030] In an embodiment, the chamber may include: a first chamber, in which a drying gas for spraying onto a first surface of an electrode plate flows; and a second chamber, in which a drying gas for spraying onto a second surface of the electrode plate flows, and the plurality of gas nozzles may be installed in at least one of the first chamber and the second chamber.

[0031] According to the present disclosure, a gas nozzle for an electrode plate drying device of a secondary battery may include: a nozzle body including a top plate, a bottom plate, and a side plate connecting the top plate and the bottom plate to form a flow space; a partition plate disposed between the top plate and the bottom plate, the partition plate partitioning the flow space into a first flow space and a second flow space; at least one inflow hole formed in the top plate; a plurality of connecting holes formed in the partition plate; and a plurality of injection holes formed in the bottom plate. The at least one inflow hole, the connecting holes, and the injection holes are configured so that the drying gas enters the first flow space via the at least one inflow hole, is dispersed in the first flow space before entering the second flow space via the connecting holes, and is injected from the second flow space to the outside via the injection holes.

[0032] (III) Beneficial effects

[0033] According to the embodiments of the present disclosure, a flow rate and / or flow velocity deviation according to the position of the electrode plate may be reduced.

[0034] According to the embodiments of the present disclosure, drying efficiency and drying quality deviation according to the position of the electrode plate may be reduced.

[0035] According to the embodiments of the present disclosure, even if the electrode plate is wide, defects such as cracks and warping on both sides of the electrode plate can be reduced, and the quality of the electrode plate can be improved even if the electrode plate is wide. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 is a perspective view showing an electrode plate drying device according to an embodiment.

[0037] Figure 2 is a perspective view showing a gas nozzle for drying an electrode plate according to an embodiment.

[0038] Figure 3a It is a partially cutaway perspective view of a gas nozzle for drying an electrode plate according to an embodiment.

[0039] Figure 3b is along Figure 1 The cross-sectional view taken along the line I-I' shows Figure 3a A cross section of a gas nozzle is shown.

[0040] Figure 3c It is shown Figure 3b A schematic diagram of the flow of drying gas in the gas nozzle is shown.

[0041] Figure 4a It is a partially cutaway perspective view of a gas nozzle for drying an electrode plate according to another embodiment.

[0042] Figure 4b is along Figure 1 The cross-sectional view taken along the line I-I' shows Figure 4a A cross section of a gas nozzle is shown.

[0043] Figure 4c It is shown Figure 4b A schematic diagram of the flow of drying gas in the gas nozzle is shown.

[0044] Figure 5a is a perspective view showing an electrode plate drying device according to a comparative example.

[0045] Figure 5b is along Figure 5aA cross-sectional view taken along line II-II' shows a state in which a gas nozzle is provided in the electrode plate drying device according to the first comparative example.

[0046] Figure 5c yes Figure 5b A partially cutaway perspective view of a gas nozzle is shown.

[0047] Figure 6 is along Figure 5a The cross-sectional view taken along line II-II' shows a state in which a gas nozzle is provided in the electrode plate drying device according to the second comparative example.

[0048] Figure 7a The figure shows the simulated drying gas flow through Figure 3a to Figure 3c Figure 2 shows the results of the gas nozzle.

[0049] Figure 7b The figure shows the simulated drying gas flow through Figures 4a to 4c A diagram of the results for the gas nozzle is shown.

[0050] Figure 8a The figure shows the simulated drying gas flow through Figure 5b A graph showing the results of the gas nozzle of the first comparative example is shown.

[0051] Figure 8b The figure shows the simulated drying gas flow through Figure 6 A graph showing the results of the gas nozzle of the second comparative example is shown.

[0052] Description of reference numerals:

[0053] 100: Gas nozzle 110: Nozzle body

[0054] 111: First board 112: Second board

[0055] 113: Side panel 115: Divider panel

[0056] 116: Recessed part 120: Flow space

[0057] 121: First flow space 122: Second flow space

[0058] 130: Inflow hole 140: Injection hole

[0059] 150: Communication hole 200: Drying device

[0060] 210: First chamber (chamber) 215: First gas supply space (gas supply space) DETAILED DESCRIPTION

[0061] The same reference numerals or symbols recorded in the drawings attached to this specification represent parts or components that perform substantially the same functions. For ease of description and understanding, the same reference numerals or symbols will be used to describe different embodiments. That is, even if components with the same reference numerals are shown in multiple drawings, the multiple drawings do not represent the same embodiment.

[0062] In the following description, unless the context clearly indicates otherwise, singular expressions include plural expressions. It should be understood that terms such as "including" or "comprising" are intended to indicate the presence of features, numbers, steps, operations, components, parts or combinations thereof recorded in the specification, rather than excluding the presence or additional possibility of one or more other features, numbers, steps, operations, components, parts or combinations thereof in advance.

[0063] In addition, in the following description, expressions such as upper side, upper part, lower side, lower part, side, front part, and rear part are expressed based on the directions shown in the figures. It should be noted that if the directions of the corresponding objects are changed, they can be expressed in different ways.

[0064] In addition, in this specification and claims, terms including ordinal numbers such as "first" and "second" may be used to distinguish components. These ordinal numbers are used to distinguish the same or similar components, and the meaning of the terms cannot be interpreted in a limiting manner due to the use of these ordinal numbers. For example, the order of use or the order of setting of the components combined with these ordinal numbers should not be interpreted in a limiting manner by these numbers. These ordinal numbers can be used interchangeably as needed.

[0065] Hereinafter, the present disclosure will be described in detail with reference to the accompanying drawings. However, this is merely exemplary, and the present disclosure is not limited to the specific embodiments exemplarily described.

[0066] Figure 1 is a perspective view showing an electrode plate drying device 200 according to an embodiment.

[0067] Reference Figure 1 The electrode plate drying device 200 according to an embodiment of the present disclosure may include a chamber where a drying gas flows and a plurality of gas nozzles coupled to the chamber. The chamber may include a first chamber 210 and a second chamber 230, and the gas nozzle may include a first nozzle 100 and a second nozzle 240.

[0068] The electrode plate ES may include a positive plate and a negative plate. The electrode plate ES may include a sheet-shaped or film-shaped collector, and a positive active material or a negative active material coated on the collector. For example, the negative plate may be formed by coating the negative active material on a copper sheet, and the positive plate may be formed by coating the positive active material on an aluminum sheet. The electrode plate ES may be manufactured by a coating process for coating the active material and a drying process for drying the active material. The electrode plate drying device 200 according to an embodiment of the present disclosure may be applied to the drying process of the electrode plate ES. The electrode plate drying device 200 according to the embodiment may be applied to the drying process of the negative plate, but may also be applied to the drying process of the positive plate.

[0069] A gas supply space for drying the electrode plate ES may be formed inside the chamber. The gas supply space may include a first gas supply space 215 formed inside the first chamber 210 and a second gas supply space 235 formed inside the second chamber 230 .

[0070] The drying gas may include hot air having a predetermined temperature. The temperature, composition and physical properties of the drying gas may be variously changed. The first chamber 210 and the second chamber 230 may be arranged on both sides of the electrode plate ES to be dried. For example, the first chamber 210 may be configured to allow the drying gas to be sprayed onto the first side of the electrode plate ES, and the second chamber 230 may be configured to allow the drying gas to be sprayed onto the second side of the electrode plate ES. The first side and the second side of the electrode plate ES may be the upper surface and the lower surface of the electrode plate ES, respectively. The first chamber 210 and the second chamber 230 are arranged to be separated by a predetermined interval, and the electrode plate ES may be moved along the transfer direction SS between the first chamber 210 and the second chamber 230. The transfer direction SS of the electrode plate ES may be a third direction X.

[0071] The first chamber 210 and the second chamber 230 may respectively include an inlet for supplying a drying gas from outside the chamber to the gas supply space. For example, the first chamber 210 may include a first inlet 211 for supplying a drying gas from outside the first chamber 210 to the first gas supply space 215, and the second chamber 230 may include a second inlet 231 for supplying a drying gas from outside the second chamber 230 to the second gas supply space 235. The first inlet 211 and the second inlet 231 are respectively disposed on one side of the first chamber 210 and the second chamber 230 to supply the drying gas along the length direction (or the second direction Y) of the gas nozzle. The supply direction of the drying gas may be a direction perpendicular to the moving direction SS of the electrode plate ES, i.e., the width direction of the electrode plate ES.

[0072] The first chamber 210 and the second chamber 230 may be disposed inside the main housing 250. The main housing 250 may include an exhaust port for discharging the drying gas sprayed onto the electrode plate ES through the gas nozzle to the outside of the main housing 250. The exhaust port may include a first exhaust port 251 disposed on the side of the first chamber 210 and a second exhaust port 252 disposed on the side of the second chamber 230. Guide vanes may be disposed in the first exhaust port 251 and the second exhaust port 252 to guide and stabilize the gas flow. For example, the guide vanes installed in the first exhaust port 251 and the second exhaust port 252 may have a shape such as Figure 5a The guide vanes 22 shown are also divided into a plurality of regions.

[0073] A plurality of gas nozzles may be coupled to the first chamber 210 and / or the second chamber 230 to communicate with the first gas supply space 215 of the first chamber 210 and / or the second gas supply space 235 of the second chamber 230. The gas nozzle may include a plurality of first nozzles 100 disposed in the first chamber 210 and a plurality of second nozzles 240 disposed in the second chamber 230. The first nozzle 100 and the second nozzle 240 may be disposed at positions corresponding to each other to spray the drying gas from the upper and lower sides of the electrode plate ES, and may have the same number. However, the arrangement position and number of the first nozzle 100 and the second nozzle 240 are not limited thereto.

[0074] The first nozzle 100 may be installed on a substrate 212 of the first chamber 210. The substrate 212 may be configured as a surface facing the electrode plate ES in the first chamber 210. The second nozzle 240 may be installed on a surface facing the electrode plate ES in the second chamber 230.

[0075] The first nozzle 100 and the second nozzle 240 may each have a shape extending in the width direction Y of the electrode plate ES, i.e., in a direction perpendicular to the transfer direction SS (i.e., the third direction) of the electrode plate ES. That is, the length direction Y of the first nozzle 100 and the second nozzle 240 may be the width direction of the electrode plate ES. A plurality of first nozzles 100 may be spaced apart in the third direction X, i.e., the transfer direction SS of the electrode plate ES. A plurality of second nozzles 240 may be spaced apart in the third direction X, i.e., the transfer direction SS of the electrode plate ES.

[0076] When the width of the electrode plate ES is wide, the length of the first nozzle 100 and the second nozzle 240 will also become longer. When the length of the first nozzle 100 and the second nozzle 240 becomes longer, the flow rate and / or flow rate deviation between the central part and the two side parts in the length direction of the nozzle (the second direction Y), or the flow rate and / or flow rate deviation between the two side parts may increase. In this case, according to the Y position in the width direction of the electrode plate ES, the drying deviation will increase and the quality of the electrode plate ES will decrease. The electrode plate drying device 200 disclosed in the present invention can reduce the flow rate and / or flow rate deviation by improving the gas nozzle, and can improve the quality of the electrode plate ES not only when the width WS of the electrode plate ES is narrow, but also when the width WS of the electrode plate ES is wide. The electrode plate drying device 200 disclosed in the present invention is particularly effective when applied to a wide electrode plate ES with a width WS of 700 mm or more, 1000 mm or more, 1200 mm or more, or 1500 mm or more. However, the drying device can also be used for narrower electrode plates with a width WS of less than 700 mm.

[0077] The first inlet 211 and the second inlet 231 may be configured to supply the drying gas along the second direction Y, i.e., the length direction of the gas nozzle. The drying gas may flow into the first chamber 210 and the second chamber 230 respectively along the second direction Y, flow and disperse in the first gas supply space 215 and the second gas supply space 235 respectively, and then be ejected along the first direction Z through the gas nozzle. The first direction Z is the ejection direction of the drying gas ejected through the gas nozzle 100 and is different from the second direction Y in which the drying gas flows into the first chamber 210 and the second chamber 230. Therefore, according to an embodiment of the present disclosure, the influence of the pressure and / or flow rate of the gas flowing into the first chamber 210 and the second chamber 230 on the flow rate and / or flow rate of the gas ejected through the gas nozzle 100 can be reduced. That is, since the drying gas is ejected through the gas nozzle 100 after the direction is changed, the flow rate and / or flow rate deviation according to the width direction Y position of the electrode plate ES can be reduced.

[0078] The first nozzle 100 and the second nozzle 240 may have different configurations. The first nozzle 100 and the second nozzle 240 may have the same configuration. For example, in an embodiment, the first nozzle 100 may include a circular perforated hole (a jet hole 140 described later) as shown in FIG. 3A. The second nozzle 240 may include a Coandanozzle. Different from this, the first nozzle 100 and the second nozzle 240 may each include at least one circular perforated hole.

[0079] A plurality of gas nozzles may be installed in at least one of the first chamber 210 and the second chamber 230. However, in the following disclosure, for the sake of convenience, only the case where the gas nozzle is the first nozzle 100 installed in the first chamber 210 is described, but the gas nozzle of the present disclosure may also be applicable to the second nozzle 240 installed in the second chamber 230. For the sake of convenience, the reference numeral "100" of the first nozzle 100 is used for the gas nozzle below.

[0080] Figure 2 is a perspective view showing a gas nozzle 100 for drying an electrode plate according to an embodiment, Figure 3a is a partially cutaway perspective view of a gas nozzle 100 for drying an electrode plate according to an embodiment, Figure 3b is along Figure 1 The cross-sectional view taken along the line I-I' shows Figure 3a A cross section of a gas nozzle is shown, Figure 3c It is shown Figure 3b A schematic diagram of the flow of drying gas in the gas nozzle 100 is shown.

[0081] and Figure 1 Refer to Figure 2 , Figure 3a to Figure 3c The gas nozzle 100 according to the embodiment may be coupled to a chamber (e.g., a first chamber 210) that supplies a drying gas for drying the electrode plate ES. In the following description, the chamber is described by taking the first chamber 210 as an example. However, when the gas nozzle 100 according to the embodiment is applied to a second nozzle, the "chamber" may refer to the second chamber 230.

[0082] The gas nozzle 100 according to the embodiment may include a nozzle body 110. The nozzle body 110 may form a flow space 120 in which a drying gas flowing in from the outside of the nozzle body 110 flows.

[0083] The nozzle body 110 may include a first plate 111, a second plate 112, and a partition plate 115. The nozzle body 110 may include a plurality of side plates 113 connecting an edge of the first plate 111 with a corresponding edge of the second plate 112. The nozzle body 110 may have a shape surrounded by the first plate 111, the second plate 112, and the plurality of side plates 113.

[0084] As an example, the nozzle body 110 may have a rectangular parallelepiped shape having a height H in the first direction Z, a length W in the second direction Y, and a width L in the third direction X. When the nozzle body 110 has a rectangular parallelepiped shape, the first plate 111 and the second plate 112 may form an upper surface (top surface) and a lower surface (bottom surface) of the nozzle body 110, respectively. Four side plates 113 may be provided on the sides of the nozzle body 110. The width L of the nozzle body 110 may correspond to the transfer direction SS of the electrode plate ES. The length W of the nozzle body 110 may correspond to the width direction Y of the electrode plate ES.

[0085] The first plate 111 may have a flat plate shape, and as an example, the first plate 111 may have a quadrangular plate shape. The second plate 112 may be disposed apart from the first plate 111 in the first direction Z. The second plate 112 may have a flat plate shape, and as an example, the second plate 112 may have a quadrangular plate shape.

[0086] The partition plate 115 may be disposed between the first plate 111 and the second plate 112, and may be parallel to the first plate 111 and the second plate 112. The partition plate 115 may be located at an intermediate position between the first plate 111 and the second plate 112. The first plate 111 and the partition plate 115 may be spaced apart in the first direction Z, and the partition plate 115 and the second plate 112 may also be spaced apart in the first direction Z. The first plate 111 and the partition plate 115 may be spaced apart by a first height H1, and the partition plate 115 and the second plate 112 may be spaced apart by a second height H2. The first height H1 and the second height H2 may be the same as those shown in the embodiment of FIG. 3B. In another embodiment not shown, the first height and the second height may be different.

[0087] The side plates 113 may connect the edge of the first plate 111 and the edge of the second plate 112. Each of the side plates 113 may extend from the edge of the first plate 111 in the first direction Z. An end of the first plate 111 and an end of the second plate 112 may be connected by a plurality of side plates 113. When the first plate 111 and the second plate 112 have a quadrilateral plate shape, the first plate 111 and the second plate 112 may be connected by four side plates 113.

[0088] A flow space 120 in which the drying gas flowing from the first chamber 210 flows may be formed between the first plate 111 and the second plate 112. The flow space 120 may be surrounded by the first plate 111, the second plate 112, and the plurality of side plates 113.

[0089] The partition plate 115 may partition the flow space 120 formed between the first plate 111 and the second plate 112 into a first flow space 121 opposite to the first plate 111 and a second flow space 122 opposite to the second plate 112. The partition plate 115 may restrict the flow of the drying gas in a space between the first flow space 121 and the second flow space 122 except for at least one communication hole 150 described later.

[0090] The partition plate 115 may be connected to the plurality of side plates 113. That is, the partition plate 115 may be arranged so that the edges of the partition plate 115 are respectively in contact with the plurality of side plates 113. Therefore, the flow between the first flow space 121 and the second flow space 122 at the edge portion of the partition plate 115 may be restricted.

[0091] The nozzle body 110 may be coupled to a chamber (e.g., the first chamber 210). The nozzle body 110 may be coupled to an opening 213 formed in the substrate 212 from the outside of the chamber. The first plate 111 may form the same plane as the substrate 212. That is, the first plate 111 and the substrate 212 may be disposed at the same height. However, the arrangement position of the first plate 111 is not limited thereto, and an arrangement mode in which the first plate 111 protrudes to the inside of the first gas supply space 215 of the first chamber 210 may also be adopted.

[0092] The nozzle body 110 may include at least one inflow hole 130 formed in the first plate 111 , at least one communication hole 150 formed in the partition plate 115 , and a plurality of spray holes 140 formed in the second plate 112 .

[0093] At least one inflow hole 130 formed in the first plate 111 may be configured to allow drying gas to flow from outside the nozzle body 110 into the first flow space 121. The at least one inflow hole 130 may have a slit shape that crosses the first plate 111 along the second direction Y, i.e., the length direction of the nozzle body 110. Figure 2 , Figure 3a to Figure 3c A configuration in which one inflow hole 130 is provided in the first plate 111 is shown, but the number of inflow holes 130 provided in the first plate 111 is not limited thereto.

[0094] The plurality of injection holes 140 formed in the second plate 112 may be configured to inject the drying gas of the second flow space 122 to the outside. The plurality of injection holes 140 may include a plurality of perforated holes punched in the second plate 112. The plurality of injection holes 140 may each have a circular shape, but are not limited thereto. For example, the shapes of the plurality of injection holes 140 may be variously changed to an elliptical shape, an angular shape, etc. The number and arrangement form of the plurality of injection holes 140 are not limited to Figure 3a As shown, various changes can be made.

[0095] At least one communication hole 150 formed in the partition plate 115 may be configured to communicate the first flow space 121 and the second flow space 122. The at least one communication hole 150 may be used as a passage for the drying gas to flow from the at least one inflow hole 130 to the plurality of injection holes 140. The drying gas of the first flow space 121 may move to the second flow space 122 through the at least one communication hole 150. The at least one communication hole 150 may have a slit shape that crosses the partition plate 115 along the second direction Y, i.e., the length direction of the partition plate 115.

[0096] The at least one communication hole 150 may be disposed so as not to face the at least one inflow hole 130 based on the first direction Z. That is, the at least one inflow hole 130 and the at least one communication hole 150 may be disposed at different positions in the third direction X. Therefore, the drying gas passing through the at least one inflow hole 130 does not pass through the at least one communication hole 150 directly (in a straight path) in the first direction Z, but flows in a direction different from the first direction Z and then passes through the at least one communication hole 150. Therefore, the flow of the drying gas may be dispersed in the first flow space 121 and then pass through the at least one communication hole 150.

[0097] The number of the at least one communication hole 150 may be greater than the number of the at least one inflow hole 130. When the communication hole 150 and the inflow hole 130 respectively include slit-shaped holes having the same width, if the number of the communication holes 150 is greater than the number of the inflow holes 130, the total cross-sectional area of ​​the communication holes 150 may be increased. Therefore, the drying gas diffuses into the second flow space 122 in a state where the flow rate is reduced compared to the process of passing through the inflow hole 130 in the process of passing through the at least one communication hole 150, so that the flow or flow rate may become uniform.

[0098] In addition, regardless of the number or width of the communicating holes 150 and the inflow holes 130, the total cross-sectional area of ​​at least one communicating hole 150 may have a value greater than the total cross-sectional area of ​​at least one inflow hole 130. In this case, the drying gas diffuses into the second flow space 122 in a state where the flow rate is lower than that in the process of passing through the communicating holes 150, so that the flow or flow rate can become uniform.

[0099] The total cross-sectional area of ​​the plurality of injection holes 140 may be greater than the total cross-sectional area of ​​the at least one communication hole 150. Therefore, the drying gas may be injected onto the electrode plate ES with a reduced flow rate while passing through the injection holes 140 to dry the electrode plate ES.

[0100] In addition, the total cross-sectional area of ​​at least one communication hole 150 may be greater than the total cross-sectional area of ​​at least one inflow hole 130, and the total cross-sectional area of ​​the plurality of injection holes 140 may be greater than the total cross-sectional area of ​​at least one communication hole 150. Therefore, the flow rate of the drying gas decreases when it passes through the communication hole 150 and the injection hole 140 in sequence, so that the flow can become uniform. However, in the present disclosure, the size of the total cross-sectional area of ​​the plurality of injection holes 140 is not limited to the above example.

[0101] exist Figure 3a to Figure 3c In the illustrated embodiment, the partition plate 115 may be disposed approximately at the center between the first plate 111 and the second plate 112. For example, the value of the first height H1 between the first plate 111 and the partition plate 115 may be equal to or less than the second height H2 between the partition plate 115 and the second plate 112. As an example, the value of the first height H1 may be between 0.5 and 1 times the second height H2. When the first height H1 is relatively less than the second height H2, the height of the second flow space 122 increases, and the drying gas may be uniformly or dispersed in the second flow space 122 and then discharged through the injection hole 140. However, the present disclosure does not exclude the case where the first height H1 is greater than the second height H2.

[0102] As described above, according to an embodiment of the present disclosure, the drying gas may flow in the first flow space 121 and the second flow space 122 inside the gas nozzle 100 or the flow velocity may be sufficiently uniform and then be injected through the injection hole 140. Therefore, the drying gas may be injected to the electrode plate ES in a state where the flow rate and / or flow velocity deviation in the length direction Y of the gas nozzle 100, i.e., the width direction of the electrode plate ES is small or substantially free of deviation. Therefore, according to an embodiment, even if the electrode plate ES is wide, the occurrence of defects such as cracks and warping on both sides of the electrode plate ES can be prevented or reduced, and even if the electrode plate ES is wide, the quality of the electrode plate ES can be improved.

[0103] Figure 4a FIG. 1 is a partially cutaway perspective view of a gas nozzle 100 for drying an electrode plate according to another embodiment. Figure 4b is along Figure 1 The cross-sectional view taken along the line I-I' shows Figure 4a The cross section of the gas nozzle 100 is shown, Figure 4c It is shown Figure 4b A schematic diagram of the flow of drying gas in the gas nozzle 100 is shown.

[0104] and Figure 3a to Figure 3c Like the gas nozzle 100 shown, Figures 4a to 4cThe gas nozzle 100 shown may include a nozzle body 110, which includes a first plate 111, a partition plate 115 and a second plate 112, and the gas nozzle 100 may include at least one inflow hole 130 formed in the first plate 111, at least one communication hole 150 formed in the partition plate 115 and a plurality of injection holes 140 formed in the second plate 112. Figures 4a to 4c The gas nozzle 100 is shown with Figure 3a to Figure 3c The gas nozzle 100 shown is different in that there is a difference in the shape of part of the partition plate 115. Figures 4a to 4c In the Figure 3a to Figure 3c Different configurations of the gas nozzle 100 are shown.

[0105] The partition plate 115 may include a recessed portion or a pocket 116 recessed toward the second flow space 122. The recessed portion 116 may have a shape recessed from a surface of the partition plate 115 toward the second flow space 122.

[0106] The recess 116 may have a shape that crosses the partition plate 115 along the second direction Y, i.e., the length direction of the partition plate 115. The recess 116 may be formed on the entire surface of the partition plate 115. That is, the recess 116 may have the same value as the length of the nozzle body 110, but is not limited thereto.

[0107] The recessed portion 116 may be disposed at a position facing the at least one inflow hole 130 formed in the first plate 111 with reference to the first direction Z. That is, the at least one inflow hole 130 and the recessed portion 116 may be disposed at positions corresponding to each other in the third direction X. Therefore, the drying gas flowing into the space of the recessed portion 116 through the at least one inflow hole 130 hits the surface of the recessed portion 116 and changes direction, and may flow to the spaces located on both sides of the recessed portion 116. Therefore, in this manner, after the drying gas disperses and flows to both sides of the recessed portion 116, the drying gas may pass through the communication hole 150.

[0108] The value of the first height H1 of the portion of the first flow space 121 where the recessed portion 116 is not provided may be less than or equal to the second height H2 of the portion of the second flow space 122 where the recessed portion 116 is not provided. The depth of the recessed portion 116 may be a third height H3. The value of the third height H3 of the recessed portion 116 may be less than the second height H2 of the second flow space 122.

[0109] As an example, the value of the first height H1 may be between 0.5 and 1 times of the second height H2. When the first height H1 is relatively smaller than the second height H2, the height of the second flow space 122 increases, and the depth of the recess 116 may increase accordingly. In this case, the drying gas flowing into the first flow space 121 hits the recess 116 and changes direction, and then may flow into the second flow space 122 through the connecting hole 150, and is further dispersed and uniformly flowed in the second flow space 122 before being discharged through the injection hole 140.

[0110] As described above, according to an embodiment of the present disclosure, the drying gas may be sprayed through the spray hole 140 after flowing or the flow velocity is fully dispersed and / or uniform in the first flow space 121 and the second flow space 122 inside the gas nozzle 100. Therefore, the drying gas may be sprayed to the electrode plate ES in a state where the deviation of the flow rate and / or flow velocity in the length direction Y of the gas nozzle 100, that is, the width direction of the electrode plate ES is small or substantially free of deviation. Therefore, according to an embodiment, even if the electrode plate ES is wide, defects such as cracks and warping on both sides of the electrode plate ES can be reduced, and even if the electrode plate ES is wide, the quality of the electrode plate ES can be improved.

[0111] Figure 5a is a perspective view showing an electrode plate drying device 20 according to a comparative example. Figure 5b is along Figure 5a The cross-sectional view taken along line II-II′ of FIG. 1 shows a state in which a gas nozzle is provided in the electrode plate drying device 20 according to the first comparative example. Figure 5c yes Figure 5b A partially cutaway perspective view of a gas nozzle is shown.

[0112] Reference Figure 5a The electrode plate drying device 20 according to the comparative example and the electrode plate drying device according to the Figure 1 The electrode plate drying device 200 of the illustrated embodiment is different in that a guide vane 22 is installed. Also, there is a difference in the configuration of the gas nozzle (or first nozzle 10). Detailed description of the same or similar configurations in the two drying devices will be omitted.

[0113] The electrode plate drying device 20 according to the comparative example accommodates a first chamber 21 and a second chamber 23 inside a main housing 25. The electrode plate ES as a drying object may be disposed between the first chamber 21 and the second chamber 23.

[0114] The first chamber 21 has a first inlet 21a through which the drying gas flows in, and the drying gas flowing in through the first inlet 21a can be contained in the first gas supply space 21c. In the first chamber 21, a guide vane 22 can be installed in a portion adjacent to the first inlet 21a in the first gas supply space 21c. The guide vane 22 can have a shape divided into a plurality of regions so as to disperse the gas flowing in from the first inlet 21a.

[0115] The second chamber 23 has a second inlet 23a for the drying gas to flow in, and the drying gas flowing in through the second inlet 23a can be accommodated in the second gas supply space 23c. In the second chamber 23, guide vanes can be installed in a portion of the second gas supply space 23c adjacent to the second inlet 23a.

[0116] The gas nozzle may include a first nozzle 10 installed in the first chamber 21 and a second nozzle 24 installed in the second chamber 23. The first nozzle 10 may be coupled to the substrate 21b of the first chamber 21. The drying gas ejected from the gas nozzle may be exhausted to the outside of the main housing 25 through the first exhaust port 25a and the second exhaust port 25b after drying the electrode plate ES. In the comparative example, the reference numeral "10" of the first nozzle 10 is used for the gas nozzle.

[0117] Reference Figure 5b and Figure 5c The electrode plate drying gas nozzle 10 according to the first comparative example may include a nozzle body 11 coupled to a base plate 21 b of a first chamber 21 . A guide vane 22 may be installed in a first gas supply space 21 c of the first chamber 21 .

[0118] The nozzle body 11 may include a first plate 11a formed with an inflow hole 13 and a second plate 11b formed with an injection hole 14. The inflow hole 13 may be formed by a plurality of circular holes punched in the first plate 11a. The injection hole 14 may be formed by a plurality of circular holes punched in the second plate 11b.

[0119] Figure 6 is along Figure 5a The cross-sectional view taken along line II-II′ of FIG. 1 shows a state in which the gas nozzle 10 is provided in the electrode plate drying device 20 according to the second comparative example.

[0120] and Figure 5a to Figure 5c Compared with the first comparative example shown, Figure 6 The electrode plate drying device 20 of the second comparative example shown shows a state in which the guide vane 22 is not provided in the first gas supply space 21 c of the first chamber 21 .

[0121] In accordance with Figure 6In the electrode plate drying device 20 of the second comparative example shown in FIG. Figure 5a to Figure 5c The configuration in the first comparative example shown is the same, so detailed description is omitted.

[0122] The embodiments of the present disclosure are further described below in conjunction with specific experimental examples. The embodiments and comparative examples included in the experimental examples are only examples of the present disclosure and do not limit the scope of the attached claims. It is obvious to those skilled in the art that various changes and modifications can be made to the embodiments within the scope of the present disclosure and the technical concept, and these changes and modifications belong to the scope of the attached claims.

[0123] Figure 7a The figure shows the simulated drying gas flow through Figure 3a to Figure 3c A graph of the results for the gas nozzle 100 is shown.

[0124] Figure 7b The figure shows the simulated drying gas flow through Figures 4a to 4c A graph of the results for the gas nozzle 100 is shown.

[0125] Figure 8a The figure shows the simulated drying gas flow through Figure 5b The graph shown is a result of the gas nozzle 10 of the first comparative example.

[0126] Figure 8b The figure shows the simulated drying gas flow through Figure 6 The graph shown is a result of the gas nozzle 10 of the second comparative example.

[0127] Figure 7a and Figure 7b , Figure 8a and Figure 8b The flow rate at 5 mm above the electrode plate surface when the drying gas is sprayed from the gas nozzles 100, 10 provided in the first chambers 210, 21 is shown. The area where the flow rate of the drying gas is measured can be divided into a first portion DS adjacent to the first inlet 211, 21a, a second portion CT located at the center of the electrode plate in the width direction Y, and a third portion OS away from the first inlet 211, 21a along the width direction Y of the electrode plate.

[0128] Figure 7a yes Figure 3a to Figure 3c The gas nozzle 100 is shown mounted on Figure 1 The simulation results of the first embodiment in the first chamber 210 of the electrode plate drying device 200 are shown. Figure 7b yes Figures 4a to 4c The gas nozzle 100 is shown mounted on Figure 1 The simulation results of the second embodiment in the first chamber 210 of the electrode plate drying device 200 are shown.

[0129] Figure 8a yes Figure 5b and Figure 5c The gas nozzle 10 shown is mounted on Figure 5a The simulation results of the first comparative example in the first chamber 21 of the electrode plate drying device 20 are shown. Figure 8b yes Figure 5a The electrode plate drying device 20 shown in the figure is installed in a state where the guide blades 22 are not provided in the second chamber 21. Figure 6 The simulation results of the second comparative example of the gas nozzle 10 are shown. The gas nozzles 10 of the first comparative example and the second comparative example have the same configuration, and the only difference is whether the guide vanes 22 are installed.

[0130] Figure 7a and Figure 7b Examples and Figure 8a and Figure 8b Comparative Example The experiment was performed under the same conditions except for the structure of the gas nozzle.

[0131] However, Figure 8a The first comparative example with Figure 7a and Figure 7b Examples and Figure 8b The second comparative example is different in that a guide vane 22 is installed.

[0132] exist Figure 7a and Figure 7b Examples and Figure 8a and Figure 8b In the comparative example, the cross-sectional area of ​​the first inlet 211, 21a provided in the first chamber 210, 21 is 321000mm 2 (square millimeters), air volume is 119CMM (cubic meters per minute). The simulation is carried out under normal temperature conditions. Figure 7a and Figure 7b Examples and Figure 8a and Figure 8b In the comparative example, the width WS of the electrode plate is about 1500 mm, and ten (10) gas nozzles 100 , 10 are provided in the first chambers 210 , 21 .

[0133] Figure 7a The first embodiment uses Figure 3a to Figure 3c The gas nozzle 100 shown, Figure 7b The second embodiment uses Figures 4a to 4c A gas nozzle 100 is shown.

[0134] In the gas nozzle 100 of the first embodiment and the gas nozzle 100 of the second embodiment, the number, shape and arrangement of the inflow hole 130, the communication hole 150 and the injection hole 140 of the gas nozzle 100 are the same. However, the gas nozzle 100 of the second embodiment is different in that the recessed portion 116 is provided in the partition plate 115 and the installation height of the partition plate 115 is different.

[0135] In the gas nozzle 100 of the first and second embodiments, the inflow hole 130 includes one slit-shaped hole, the communication hole 150 includes six slit-shaped holes, and the injection hole 140 includes a plurality of through holes.

[0136] In the gas nozzle 100 of the first and second embodiments, the widths of the slits of the inflow hole 130 and the communication hole 150 are 8 mm, respectively, and the total cross-sectional area of ​​the inflow hole 130 is about 11900 mm. 2 The diameter of each injection hole 140 is 10 mm, and the total cross-sectional area of ​​the plurality of injection holes 140 is 53780 mm 2 (square millimeters).

[0137] exist Figure 8a The first comparative example and Figure 8b In the second comparative example, the same gas nozzle 10 is provided. In each gas nozzle 10, the diameter of each inflow hole 13 is 8 mm, and the total cross-sectional area of ​​the plurality of inflow holes 13 is 36850 mm 2 (square millimeters). The diameter of each injection hole 14 is 10 mm, and the total cross-sectional area of ​​the plurality of injection holes 14 is 53780 mm 2 (square millimeters).

[0138] exist Figure 8a and 8b In the case of the first comparative example and the second comparative example shown, as a whole, the flow velocity of the second portion CT located at the center of the electrode plate in the width direction Y is low, while the flow velocity of the first portion DS and the third portion OS located on both sides of the electrode plate in the width direction Y is high. That is, in the case of the first comparative example and the second comparative example, the velocity deviation between the two side portions DS and OS in the width direction of the electrode plate and the center portion CT in the width direction is large.

[0139] In contrast, Figure 7a and Figure 7b In the case of the first embodiment and the second embodiment shown, it can be seen that the speed deviation between the second portion CT located at the center of the width direction Y of the electrode plate and the first portion DS and the third portion OS located on both sides of the width direction Y is reduced. In addition, it can be seen that the speed deviation between the first portion DS and the third portion OS located on both sides of the width direction of the electrode plate is reduced.

[0140] That is, it can be seen that, in the first and second embodiments, the speed deviations of both side portions DS, OS in the width direction and the center portion CT in the width direction of the electrode plate are reduced as a whole in the case of the first and second embodiments compared with the first and second comparative examples.

[0141] As described above, according to the embodiments of the present disclosure, the drying gas can be sprayed to the electrode plate in a state where the flow rate and / or flow velocity deviation in the width direction of the electrode plate is small or substantially free of deviation. Therefore, even for electrode plates with a large width, defects such as cracks and warping on both sides of the electrode plate can be reduced, and the quality of the electrode plate can be improved even for electrode plates with a large width.

[0142] The above content is only an example of applying the principle of the present disclosure, and other configurations may also be included without departing from the scope of the present invention. In addition, the present disclosure may be implemented by deleting some components in the above embodiments, or by combining the embodiments with each other.

Claims

1. A gas nozzle for drying an electrode plate, comprising: a nozzle body comprising a first plate, a second plate disposed apart from the first plate in a first direction, and a partition plate disposed between the first plate and the second plate, the partition plate partitioning a flow space formed between the first plate and the second plate into a first flow space opposite to the first plate and a second flow space opposite to the second plate; at least one inflow hole formed in the first plate and configured to allow a drying gas to flow from outside the nozzle body into the first flow space; at least one communication hole formed in the partition plate and communicating the first flow space with the second flow space; as well as A plurality of injection holes are formed in the second plate and configured to inject the drying gas in the second flow space to the outside.

2. The gas nozzle for drying the electrode plate according to claim 1, wherein: The at least one inflow hole has a slit shape that crosses the first plate along a second direction, ie, a length direction of the nozzle body.

3. The gas nozzle for drying the electrode plate according to claim 2, wherein: The at least one communication hole has a slit shape that crosses the partition plate along the second direction.

4. The gas nozzle for drying the electrode plate according to claim 3, wherein: The at least one communication hole is disposed not to face the at least one inflow hole with reference to the first direction.

5. The gas nozzle for drying the electrode plate according to claim 1, wherein: The first plate and the partition plate have a flat plate shape.

6. The gas nozzle for drying the electrode plate according to claim 1, wherein: The nozzle body includes a plurality of side plates connecting the edge of the first plate and the edge of the second plate, The partition plate is connected to the plurality of side plates.

7. The gas nozzle for drying the electrode plate according to claim 3, wherein: The partition plate includes a recessed portion recessed toward the second flow space.

8. The gas nozzle for drying the electrode plate according to claim 7, wherein: The recessed portion is provided at a position facing the at least one inflow hole with reference to the first direction.

9. The gas nozzle for drying the electrode plate according to claim 7, wherein: The recessed portion has a shape that crosses the partition plate along the second direction, At least one communicating hole is respectively arranged on both sides of the recessed portion.

10. The gas nozzle for drying the electrode plate according to claim 7, wherein: A first height of a portion of the first flow space where the recessed portion is not provided is smaller than a second height of a portion of the second flow space where the recessed portion is not provided.

11. The gas nozzle for drying the electrode plate according to claim 1, wherein: The total cross-sectional area of ​​the at least one communication hole has a value greater than the total cross-sectional area of ​​the at least one inflow hole.

12. The gas nozzle for drying the electrode plate according to claim 1, wherein: The number of the at least one communication hole is greater than the number of the at least one inflow hole.

13. The gas nozzle for drying the electrode plate according to claim 1, wherein: The plurality of injection holes have a circular shape.

14. An electrode plate drying device, comprising: a chamber forming a gas supply space for flowing a drying gas for drying the electrode plate; as well as a gas nozzle coupled to the chamber to communicate with the gas supply space of the chamber, The plurality of gas nozzles comprises: a nozzle body comprising a first plate, a second plate disposed apart from the first plate in a first direction, and a partition plate disposed between the first plate and the second plate, the partition plate partitioning a flow space formed between the first plate and the second plate into a first flow space opposite to the first plate and a second flow space opposite to the second plate; at least one inflow hole formed in the first plate and configured to allow a drying gas to flow from outside the nozzle body into the first flow space; at least one communication hole formed in the partition plate and communicating the first flow space with the second flow space; and A plurality of injection holes are formed in the second plate and configured to inject the drying gas in the second flow space to the outside.

15. The electrode plate drying device according to claim 14, wherein: The plurality of gas nozzles have a shape extending in the second direction, i.e., the width direction of the electrode plate, and are spaced apart in the third direction, i.e., the moving direction of the electrode plate. The first direction, the second direction and the third direction are perpendicular to each other.

16. The electrode plate drying device according to claim 15, wherein: The chamber includes an inlet for supplying a drying gas from outside the chamber to the gas supply space. The inlet is configured to supply the drying gas along the second direction.

17. The electrode plate drying device according to claim 14, wherein: The chamber comprises: a first chamber in which a drying gas for spraying onto a first surface of the electrode plate flows; and a second chamber in which a drying gas sprayed onto the second surface of the electrode plate flows; The plurality of gas nozzles are installed in at least one of the first chamber and the second chamber.

18. A gas nozzle for a secondary battery electrode plate drying device, the gas nozzle comprising: A nozzle body, comprising a top plate, a bottom plate, and a side plate connecting the top plate and the bottom plate to form a flow space; a partition plate, disposed between the top plate and the bottom plate, the partition plate dividing the flow space into a first flow space and a second flow space; at least one inflow hole formed in the top plate; a plurality of communication holes formed in the partition plate; as well as A plurality of injection holes are formed in the bottom plate, The at least one inflow hole, the communicating hole, and the injection hole are configured such that the drying gas enters the first flow space via the at least one inflow hole, is dispersed in the first flow space before entering the second flow space via the communicating hole, and is injected from the second flow space to the outside via the injection hole.

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