Secondary battery manufacturing apparatus and slit die unit for manufacturing secondary battery

Abstract

A secondary battery manufacturing apparatus and a slit mold unit for manufacturing secondary batteries are disclosed. The secondary battery manufacturing apparatus includes: a substrate conveying unit configured to convey a substrate along a conveying path; a double-slit mold configured to coat the substrate with an active material, and including a lower mold, a central mold fixed to the lower mold, and an upper mold slidably mounted on the upper surface of the central mold, the double-slit mold having a lower discharge port between the lower mold and the central mold and an upper discharge port between the central mold and the upper mold; a gap adjusting unit configured to move the double-slit mold to adjust the gap between the upper discharge port and the lower discharge port and the substrate; a controller configured to drive the gap adjusting unit; and an upper mold support configured to slide the upper mold to adjust and maintain the gap between the upper mold and the substrate.

Description

Technical Field

[0001] An aspect of the embodiments of this disclosure relates to a secondary battery manufacturing apparatus and a slit mold unit for manufacturing secondary batteries. Background Technology

[0002] Unlike primary batteries, which are not designed for (re)charging, secondary batteries are designed for discharging and recharging. Typically, a secondary battery includes an electrode assembly comprising positive and negative electrode plates and a separator (or formed therefrom).

[0003] Positive or negative electrode plates can be manufactured by a coating process that coats one or both sides of an electrode substrate with a mixture (e.g., a mixture of electrode materials), a rolling process that extrudes and stretches the electrode plate coated with the mixture in the coating process to make the electrode plate thin and flat, a slitting process that cuts the coated electrode plate into multiple rows in the longitudinal direction to separate the electrode plate into individual electrode plates, and a slotting process that cuts the separated individual electrode plates laterally to remove unnecessary parts and form connecting pieces.

[0004] A double-slit die can be used in coating processes. A double-slit die is an apparatus for coating the surface of a substrate with a mixture in slurry form. The mixture coated on the substrate is formed in one layer, and in some cases, the mixture may have a two-layer stacked structure. The double-slit die has two discharge sections (or discharge ports) for forming a stacked mixture with a two-layer structure to form a double-layer electrode (DLE).

[0005] However, conventional double-slit dies used to form DLEs cannot adjust the relative gap between each discharge section and the support roller. Because conventional double-slit dies cannot achieve two-layer coatings with different thicknesses, their application is limited.

[0006] The information disclosed in this background section is intended to enhance the understanding of the background art of this disclosure, and therefore may contain information that does not constitute related (or prior art). Summary of the Invention

[0007] Embodiments of this disclosure relate to a secondary battery manufacturing apparatus and a slit mold unit for manufacturing secondary batteries, which is capable of forming multilayer electrode layers of different thicknesses and preventing contamination of uncoated portions or dragging of the front and rear ends of coated portions during intermittent (e.g., patterned) coating.

[0008] According to one embodiment of this disclosure, a secondary battery manufacturing apparatus includes: a substrate conveying unit configured to convey a substrate along a conveying path; a double-slit mold configured to coat the substrate with an active material, and including a lower mold, a central mold fixed on the lower mold, and an upper mold slidably mounted on the upper surface of the central mold, the double-slit mold having a lower discharge port formed between the lower mold and the central mold and an upper discharge port formed between the central mold and the upper mold; a gap adjusting unit configured to move the double-slit mold to adjust the gap between the upper discharge port and the lower discharge port and the substrate; a controller configured to drive the gap adjusting unit; and an upper mold support configured to slide the upper mold to adjust and maintain the gap between the upper mold and the substrate.

[0009] According to another embodiment of this disclosure, a slit mold unit for manufacturing a secondary battery is aligned with a substrate to be coated with an active material. The slit mold unit includes a double-slit mold comprising: a lower mold; a central mold fixed to the lower mold; and an upper mold slidably mounted on the upper surface of the central mold. The slit mold unit is configured to discharge the active material to be coated on the substrate and has a lower discharge port formed between the lower mold and the central mold, and an upper discharge port formed between the central mold and the upper mold.

[0010] The aspects and features of this disclosure are not limited to those described above, and those skilled in the art will clearly understand from the following description of this disclosure other aspects and features not specifically mentioned herein. Attached Figure Description

[0011] The following figures, attached to this specification, illustrate embodiments of the present disclosure and further describe aspects and features of the disclosure together with the detailed description thereof. Therefore, this disclosure should not be construed as limited to the figures, in which:

[0012] Figure 1 It is a perspective view of an electrode assembly including an electrode plate manufactured by a secondary battery manufacturing apparatus according to an embodiment of the present disclosure;

[0013] Figure 2 yes Figure 1 The electrode assembly shown is an internal perspective view of the pouch cell into which it is applied;

[0014] Figure 3 This is a cross-sectional view of a cylindrical secondary battery;

[0015] Figure 4 It is a cross-sectional view of a prismatic secondary battery;

[0016] Figure 5This is a perspective view of a slot die unit for manufacturing a secondary battery according to an embodiment of the present disclosure;

[0017] Figure 6 yes Figure 5 The side view of the double-slit mold shown;

[0018] Figure 7 yes Figure 6 An enlarged view of the discharge section of the double-slit mold shown;

[0019] Figure 8 This illustrates the application of gap plates. Figure 5 A side view showing the state of the double-slit mold;

[0020] Figure 9 This is an example Figure 8 An enlarged view of the discharge section of the double-slit mold shown;

[0021] Figure 10 It is more than Figure 8 The side view of a double-slit mold to which the gap plate of the shown thickness is applied;

[0022] Figure 11 yes Figure 10 An enlarged view of the discharge section of the double-slit mold shown;

[0023] Figure 12 This is a perspective view of a slit mold unit according to another embodiment of the present disclosure;

[0024] Figure 13 yes Figure 12 The side view of the double-slit mold shown;

[0025] Figure 14 It describes regulation Figure 13 A side cross-sectional view showing the method of positioning the upper mold;

[0026] Figure 15 It describes regulation Figure 13 A planar cross-sectional view showing the method of positioning the upper mold;

[0027] Figure 16 This is an example Figure 12 A diagram showing the exterior of the gap adjuster;

[0028] Figure 17 This is a schematic diagram illustrating a secondary battery manufacturing apparatus according to an embodiment of the present disclosure;

[0029] Figure 18 This is a perspective view illustrating a secondary battery pack manufactured by a secondary battery manufacturing apparatus according to an embodiment of the present disclosure; and

[0030] Figure 19 This is an example Figure 18 The diagram shows the state of the secondary battery pack applied to the vehicle. Detailed Implementation

[0031] In the following, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The terms or words used in this specification and claims should not be interpreted narrowly according to their general or dictionary meaning, but rather should be interpreted as having meanings and concepts consistent with the technical spirit of the present disclosure, based on the principle that the inventor can appropriately define the concepts of the terms for his / her own lexicographer in order to best describe his / her invention. The embodiments described in this specification and the configurations shown in the figures are merely some embodiments of the present disclosure and do not represent all aspects, features, and embodiments of the present disclosure. Accordingly, it should be understood that at the time of filing this application, various equivalents and modifications that can replace or modify one or more embodiments or features described herein may exist.

[0032] It will be further understood that the terms “comprising” and / or “including”, if used in this specification, specify the presence of the stated features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0033] In the figures, for clarity of illustration, the dimensions of various components, layers, etc., may be enlarged. The same reference numerals denote the same components.

[0034] Referring to two compared elements, features, etc., as “identical” can mean that they are “substantially identical.” Therefore, the phrase “substantially identical” can include cases with deviations considered low in the art, such as about 5% or less. Furthermore, the uniformity of parameters within a predetermined region can mean uniformity over the average angle.

[0035] Although the terms "first," "second," etc., are used to describe various components, these components are not fundamentally limited by these terms. These terms are only used to distinguish one component from another, and unless otherwise stated, the first component can certainly also be the second component.

[0036] Throughout this specification, unless otherwise stated, each element may be a single element or a plurality of elements.

[0037] Placing any element "above (or below)" or "on (below)" another element means that the element can contact the upper (or lower) surface of the element, and the other element can be located between the element and any element located above (or below) the element.

[0038] Additionally, it will be understood that if a component is referred to as a “link,” “connect,” or “attached” to another component, then these components may be directly “connected,” “linked,” or “attached” to each other, or another component may be “between” these components.

[0039] As used herein, the term “and / or” includes any and all combinations of one or more of the associated listed items. Furthermore, when describing embodiments of this disclosure, the use of “may” refers to “one or more embodiments of this disclosure.” Expressions such as “at least one of” and “any one of” modify the entire column of elements if they follow a column of elements, and do not modify individual elements of the column.

[0040] Throughout the specification, unless otherwise stated, if “A and / or B” is stated, it means A, B or A and B, and unless otherwise stated, if “C to D” is stated, it means above C and below D.

[0041] When phrases such as “at least one of A, B and C”, “at least one of A, B or C”, “at least one of the group selected from A, B and C” or “at least one of A, B and C” are used to specify a list of elements A, B and C, the phrase may refer to any and all suitable combinations or subsets of A, B and C, such as A, B, C, A and B, A and C, B and C, or A and B and C.

[0042] As used herein, the term “use” may be considered synonymous with the term “utilize”. As used herein, the terms “substantially,” “about,” and similar terms are used as approximations rather than terms of degree and are intended to take into account the inherent variations in measurements or calculations that would be recognized by one of ordinary skill in the art.

[0043] It will be understood that while the terms “first,” “second,” “third,” etc., may be used herein to describe various elements, components, areas, layers, and / or segments, these elements, components, areas, layers, and / or segments should not be limited by these terms. These terms are used to distinguish one element, component, area, layer, or segment from another. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, area, layer, or segment discussed below may be referred to as the second element, component, area, layer, or segment.

[0044] For ease of description, spatial relative terms such as “below,” “under,” “down,” “above,” and “up” may be used herein to describe the relationship between one element or feature illustrated in the figure and another element or feature. It will be understood that spatial relative terms are intended to encompass different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as “below” or “under” other elements or features would then be oriented as “above” or “upon” other elements or features. Therefore, the term “below” can encompass both above and below orientations.

[0045] The controller and / or any other related devices or components according to embodiments of the present disclosure described herein can be implemented using any suitable hardware, firmware (e.g., application-specific integrated circuits), software, and / or suitable combinations of software, firmware, and hardware. For example, various components of the controller can be formed on a single integrated circuit (IC) chip or separate IC chips. Alternatively, various components of the controller can be implemented on a flexible printed circuit film, tape-on-a-carrier package (TCP), or printed circuit board (PCB), or formed on the same substrate as the controller. Furthermore, various components of the controller can be processes or threads that run on one or more processors in one or more computing devices, execute computer program instructions, and interact with other system components to perform the various functions described herein. The computer program instructions can be stored in memory, which can be implemented in the computing device using standard memory devices such as random access memory (RAM). The computer program instructions can also be stored in other non-transient computer-readable media such as CD-ROMs or flash drives. Moreover, those skilled in the art will recognize that, without departing from the scope of exemplary embodiments of the present disclosure, the functions of various computing devices can be combined or integrated into a single computing device, or the functions of a particular computing device can be distributed across one or more other computing devices.

[0046] The terminology used herein is for the purpose of describing embodiments of this disclosure and is not intended to limit this disclosure.

[0047] Figure 1 This is a schematic diagram of an electrode assembly 10 of a secondary battery that can be manufactured by an apparatus for manufacturing a secondary battery according to an embodiment of the present disclosure.

[0048] The electrode assembly 10 can be formed by winding or stacking a first electrode plate 10a, a diaphragm 10c, and a second electrode plate 10e, both of which are formed as thin plates or films. The first electrode plate 10a of the electrode assembly 10 can be used as a negative electrode, and the second electrode plate 10e can be used as a positive electrode. Of course, the reverse is also possible.

[0049] In other embodiments, the electrode assembly 10 may be stacked rather than wound, but the shape of the electrode assembly 10 is not limited in this disclosure. Furthermore, the electrode assembly 10 may be a Z-stacked electrode assembly, wherein the positive electrode plate and the negative electrode plate are inserted into both sides (e.g., opposite sides) of the diaphragm and then bent (or folded) into a Z-stack.

[0050] Furthermore, multiple electrode assemblies can be stacked (e.g., arranged) such that the long sides of the electrode assemblies are adjacent to each other and housed in a housing, and the number of electrode assemblies in the housing is not limited in this disclosure.

[0051] The first electrode plate 10a can be formed by applying (e.g., coating or depositing) a first electrode active material, such as graphite or carbon, onto a first electrode substrate formed of a metal foil such as copper, a copper alloy, nickel, or a nickel alloy. The first electrode plate 10a may include a first electrode tab (e.g., a first uncoated portion) 10g for areas where the first electrode active material is not applied. The first electrode tab 10g may be connected to an external first terminal. In some embodiments, when manufacturing the first electrode plate 10a, the first electrode tab 10g may be formed by being pre-cut to protrude toward (or from) one side of the electrode assembly 10, or the first electrode tab 10g may protrude toward one side of the electrode assembly 10 more than (e.g., farther or beyond) the diaphragm 10c without being separately cut.

[0052] The second electrode plate 10e can be formed by applying (e.g., coating or depositing) a second electrode active material, such as a transition metal oxide, onto a second electrode substrate formed of a metal foil such as aluminum or an aluminum alloy. The second electrode plate 10e may include a second electrode tab (e.g., a second uncoated portion) 10h for areas where the second electrode active material is not applied. The second electrode tab 10h can be connected to an external second terminal. In some embodiments, when manufacturing the second electrode plate 10e, the second electrode tab 10h can be formed by being pre-cut to protrude toward the other side (e.g., the opposite side) of the electrode assembly 10, or the second electrode tab 10h can protrude toward the other side of the electrode assembly 10 more than (e.g., farther or beyond) the diaphragm 10c without being separately cut.

[0053] The electrode active material can have a two-layer structure as a coating applied by the double-slit mold 30 of the secondary battery manufacturing apparatus 70, which will be described later. This two-layer structure can be an active material layer that is discharged simultaneously (e.g., almost simultaneously) through the lower discharge section and the upper discharge section. When only one of the lower discharge section and the upper discharge section is operated, an electrode active material layer with a single-layer structure can be achieved.

[0054] The diaphragm 10c prevents short circuits between the first electrode plate 10a and the second electrode plate 10e, while allowing lithium ions to move between them. The diaphragm 10c can be made of, for example, a polyethylene membrane, a polypropylene membrane, or a polyethylene-polypropylene membrane.

[0055] In some embodiments, the electrode assembly 10 may be housed together with the electrolyte in a housing. In a pouch-type secondary battery, the electrode assembly 10 may be housed in a pouch made of a flexible material (see, for example...). Figure 2 In cylindrical or prismatic secondary batteries, the electrode assembly 10 can be housed in a cylindrical or prismatic metal casing (see, for example...). Figure 3 and Figure 4 ).

[0056] The materials of the electrode plates that can be used in the above electrode assemblies are described.

[0057] As the positive electrode active material, compounds capable of reversibly inserting / deintercalating lithium (e.g., lithiated intercalation compounds) can be used. For example, at least one of lithium and a composite oxide of a metal selected from cobalt, manganese, nickel, and combinations thereof can be used.

[0058] The composite oxide may be a lithium transition metal composite oxide, and examples may include lithium nickel oxides, lithium cobalt oxides, lithium manganese oxides, lithium iron phosphate compounds, cobalt-free nickel manganese oxides, or combinations thereof.

[0059] As an example, a compound represented by any of the following molecular formulas can be used: Li a A 1-b X b O 2-c D c (0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.05); Li a Mn 2-b X b O 4-c D c (0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.05); Li a Ni 1-b-c Co b X c O 2-α D α (0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.5, 0<α<2); Li a Ni 1-b- c Mn b X c O 2-α D α(0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.5, 0<α<2); Li a Ni b Co c L 1 d G e O2 (0.90≤a≤1.8, 0≤b≤0.9, 0≤c≤0.5, 0≤d≤0.5, 0≤e≤0.1); Li a NiG b O2(0.90≤a≤1.8, 0.001≤b≤0.1); Li a CoG b O2(0.90≤a≤1.8, 0.001≤b≤0.1); Li a Mn 1-b G b O2(0.90≤a≤1.8, 0.001≤b≤0.1); Li a Mn2G b O4(0.90≤a≤1.8, 0.001≤b≤0.1); Li a Mn 1-g G g PO4(0.90≤a≤1.8, 0≤g≤0.5); Li (3-f) Fe2(PO4)3 (0≤f≤2); and Li a FePO4 (0.90≤a≤1.8).

[0060] In the above molecular formulas: A is Ni, Co, Mn, or a combination thereof; X is Al, Ni, Co, Mn, Cr, Fe, Mg, Sr, V, rare earth elements, or a combination thereof; D is O, F, S, P, or a combination thereof; G is Al, Cr, Mn, Fe, Mg, La, Ce, Sr, V, or a combination thereof; and L 1 It is Mn, Al, or a combination thereof.

[0061] The positive electrode for a lithium secondary battery may include a substrate and a positive electrode active material layer formed on the substrate. The positive electrode active material layer may include a positive electrode active material and may further include a binder and / or a conductive material.

[0062] Based on a 100wt% positive electrode active material layer, the content of the positive electrode active material is in the range of about 90wt% to about 99wt%, and based on the 100wt% positive electrode active material layer, the contents of the binder and conductive material are in the range of about 0.5wt% to about 5wt%, respectively.

[0063] The substrate can be aluminum (Al), but is not limited to this.

[0064] The negative electrode active material may include a material capable of reversibly inserting / extracting lithium ions, lithium metal, an alloy of lithium metal, a material capable of doping and dedoping lithium, or a transition metal oxide.

[0065] The material capable of reversibly inserting / extracting lithium ions may be a carbon-based negative electrode active material, which may include, for example, crystalline carbon, amorphous carbon, or a combination thereof. Examples of crystalline carbon may include graphite, such as natural graphite or artificial graphite, and examples of amorphous carbon may include soft carbon, hard carbon, pitch carbide (e.g., mesophase pitch carbide), sintered coke, etc.

[0066] A Si-based negative electrode active material or a Sn-based negative electrode active material may be used as the material capable of doping and dedoping lithium. The Si-based negative electrode active material may be silicon, a silicon-carbon composite, SiO x (0 < x ≤ 2), a Si-based alloy, or a combination thereof.

[0067] The silicon-carbon composite may be a composite of silicon and amorphous carbon. According to one embodiment, the silicon-carbon composite may be in the form of silicon particles and amorphous carbon coated on the surface of the silicon particles.

[0068] The silicon-carbon composite may further include crystalline carbon. For example, the silicon-carbon composite may include a core containing crystalline carbon and silicon particles and an amorphous carbon coating on the surface of the core.

[0069] The negative electrode for a lithium secondary battery may include a substrate and a negative electrode active material layer provided on the substrate. The negative electrode active material layer may include a negative electrode active material and may further include a binder and / or a conductive material.

[0070] For example, the negative electrode active material layer may include about 90 wt% to about 99.5 wt% of the negative electrode active material, about 0.5 wt% to about 5 wt% of the binder, and about 0 wt% to about 5 wt% of the conductive material.

[0071] A non-aqueous binder, an aqueous binder, a dry binder, or a combination thereof may be used as the binder. When an aqueous binder is used as the negative electrode binder, a cellulose-based compound capable of imparting viscosity may be further included.

[0072] As the negative electrode substrate, one selected from copper foil, nickel foil, stainless steel foil, titanium foil, nickel foam, copper foam, a conductive metal-coated polymer substrate, and a combination thereof may be used.

[0073] The electrolyte for a lithium secondary battery may include a non-aqueous organic solvent and a lithium salt.

[0074] The non-aqueous organic solvent serves as a medium through which ions participating in the electrochemical reaction of the battery can move.

[0075] Non-aqueous organic solvents can be carbonates, esters, ethers, ketones, alcohols, or aprotic solvents, and can be used alone or in combination of two or more.

[0076] In addition, when using carbonate solvents, a mixture of cyclic carbonates and chain carbonates can be used.

[0077] Depending on the type of lithium secondary battery, a separator may be present between the first electrode plate (e.g., the negative electrode) and the second electrode plate (e.g., the positive electrode). Polyethylene, polypropylene, polyvinylidene fluoride, or multilayer films comprising two or more layers thereof can be used as the separator.

[0078] The diaphragm may include a porous substrate and a coating comprising organic material, inorganic material or a combination thereof on one or both surfaces of the porous substrate.

[0079] Organic materials may include polyvinylidene fluoride polymers or (meth)acrylic acid polymers.

[0080] Inorganic materials may include, but are not limited to, inorganic particles selected from Al2O3, SiO2, TiO2, SnO2, CeO2, MgO, NiO, CaO, GaO, ZnO, ZrO2, Y2O3, SrTiO3, BaTiO3, Mg(OH)2, boehmite and combinations thereof.

[0081] Organic and inorganic materials can be mixed in a single coating or can be in the form of a coating that includes (or contains) organic materials and a coating that includes (or contains) inorganic materials stacked on top of each other.

[0082] Figure 2 yes Figure 1 The electrode assembly 10 shown is an internal perspective view of the pouch cell 11 to which it can be applied.

[0083] The pouch-type secondary battery 11 includes an electrode assembly 10 and a pouch 11a that houses the electrode assembly 10.

[0084] Electrode assembly 10 can be with Figure 1 The electrode assembly 10 shown is identical. The first electrode terminal 10g and the second electrode terminal 10h of the electrode assembly 10 can be electrically connected by soldering to corresponding external first terminal lead 11b and second terminal lead 11c. Each of the first terminal lead 11b and the second terminal lead 11c may have a terminal film 11d attached thereto for insulation from the bag 11a.

[0085] The bag 11a can be sealed by bringing its sealing portions 11e at its edges into contact with each other while housing the electrode assembly 10. In this case, the seal can be achieved using a connecting film 11d between the sealing portions 11e. The sealing portions 11e of the bag 11a can all be made of a hot-melt material that generally exhibits weak adhesion to metals. Therefore, the thin connecting film 11d can be fused to the bag 11a between the sealing portions 11e.

[0086] Figure 3 yes Figure 1 The electrode assembly 10 shown is a cross-sectional view of a cylindrical secondary battery to which it can be applied.

[0087] The cylindrical battery 13 includes an electrode assembly 13a, a housing 13p in which the electrode assembly 13a and an electrolyte are housed, a cover assembly 13v connected to an opening in the housing 13p to seal the housing 13p, and an insulating plate 13n located inside the housing 13p between the electrode assembly 13a and the cover assembly 13v.

[0088] The electrode assembly 13a may include a first electrode 13c and a second electrode 13e positioned with a diaphragm 13d therebetween, and may be wound into an electrode core shape.

[0089] The first electrode 13c includes a first substrate and a first active material layer on the first substrate. A first lead tab 13j can extend outward from a first uncoated portion of the unpositioned first active material layer on the first substrate, and the first lead tab 13j can be electrically connected to the cover assembly 13v.

[0090] The second electrode 13e includes a second substrate and a second active material layer on the second substrate. A second lead tab 13k extends outward from a second uncoated portion of the unpositioned second active material layer on the second substrate, and the second lead tab 13k can be electrically connected to the housing 13p. The first lead tab 13j and the second lead tab 13k can extend from the electrode assembly 13a in opposite directions.

[0091] The first electrode 13c can be used as a positive electrode. In this embodiment, the first substrate can be made of, for example, aluminum foil, and the first active material layer can include, for example, a transition metal oxide. The second electrode 13e can be used as a negative electrode. In this embodiment, the second substrate can be made of, for example, copper foil or nickel foil, and the second active material layer can include, for example, graphite.

[0092] The separator 13d prevents a short circuit between the first electrode 13c and the second electrode 13e, while allowing lithium ions to move between them. The separator 13d can be made of, for example, a polyethylene membrane, a polypropylene membrane, or a polyethylene-polypropylene membrane.

[0093] The housing 13p houses the electrode assembly 13a and, together with the cover assembly 13v, forms the appearance of the secondary battery. The housing 13p may have a substantially cylindrical body portion 13r and a bottom portion 13q connected to one side (e.g., one end) of the body portion 13r. An inwardly deformed coiled portion (e.g., a coiled piece) 13f may be formed in the body portion 13r, and an inwardly bent crimped portion (e.g., a crimping piece) 13g may be formed at the open end of the body portion 13r.

[0094] The crimping portion 13f reduces or prevents movement of the electrode assembly 13a within the housing 13p and facilitates the placement of the gasket 13h and the cover assembly 13v. The crimping portion 13g securely fixes the cover assembly 13v by pressing the edge of the cover assembly 13v against the gasket 13h. The housing 13p may be formed of, for example, nickel-plated steel.

[0095] The cover assembly 13v can be secured to the inside of the crimping portion 13g via a gasket 13h to seal the housing 13p. The cover assembly 13v may include an upper cover 13w, a safety vent 13s, a lower cover 13t, an insulating member, and a sub-plate 13u, but the cover assembly 13v is not limited to this example and can be modified in various ways.

[0096] The top cover 13w may be located at the top of the cover assembly 13v. The top cover 13w may include an upwardly protruding terminal portion that connects to an external circuit, and an outlet for venting gas may be arranged around the terminal portion.

[0097] The safety vent 13s may be located below the top cover 13w. The safety vent 13s may include a protrusion that projects downward and is connected to the sub-plate 13u, and at least one recess may be formed in the safety vent around the protrusion.

[0098] If excessive gas is generated due to overcharging or abnormal operation of the secondary battery, the protrusion deforms upward due to pressure and separates from the sub-plate 13u as the safety vent 13s is cut off (e.g., cracked or torn) along the notch. The cut-off safety vent 13s prevents the secondary battery 13 from exploding by allowing gas to escape to the outside.

[0099] The lower cover 13t may be located below the safety vent 13s. The lower cover 13t may have a first opening for exposing the safety vent 13s and a second opening for gas discharge. An insulating member may be located between the safety vent 13s and the lower cover 13t to insulate the safety vent 13s from the lower cover 13t.

[0100] Subplate 13u can be located below lower cover 13t. Subplate 13u can be fixed to the lower surface of lower cover 13t to block the first opening of lower cover 13t, and the protrusion of safety vent 13s can be fixed to subplate 13u. First lead connector 13j extending from electrode assembly 13a can be fixed to subplate 13u. Accordingly, upper cover 13w, safety vent 13s, lower cover 13t, and subplate 13u can be electrically connected to the first electrode 13c of electrode assembly 13a.

[0101] The insulating plate 13n can be positioned below the coiled portion 13f, in contact with the electrode assembly 13a. The insulating plate 13n may have a lead-out opening through which a first lead-out piece 13j extends. The cover assembly 13v, electrically connected to the first electrode 13c via the first lead-out piece 13j, can face the electrode assembly 13a (with the insulating plate 13n positioned between the cover assembly 13v and the electrode assembly 13a), and can be kept insulated (e.g., electrically insulated) from the electrode assembly 13a by the insulating plate 13n. Another insulating plate 13m may be included for insulation between the electrode assembly 13a and the bottom portion 13q of the housing 13p.

[0102] Figure 4 yes Figure 1 The electrode assembly 10 shown is a cross-sectional view of a prismatic secondary battery 15 to which it can be applied.

[0103] The housing 15a forms the overall appearance of the prismatic battery and can be made of a conductive metal such as aluminum, aluminum alloy, or nickel-plated steel. Furthermore, the housing 15a can provide (or may form) space for accommodating the electrode assembly 15r therein.

[0104] The cover assembly 15b may include a cover plate 15c that covers an opening in the housing 15a. In some embodiments, the housing 15a and the cover plate 15c may be made of a conductive material. The first terminal 15d and the second terminal 15e may be electrically connected to corresponding positive and negative electrodes (or negative and positive electrodes) inside the housing 15a and may be mounted to protrude outward through the cover plate 15c.

[0105] An electrolyte inlet 15f and a gas vent (e.g., a gas vent opening) may be formed in a cover plate 15c, and a venting portion (e.g., a gas venting device) 15h may be connected to (or placed in) the gas vent. The gas venting device 15h opens (e.g., cracks or tears) in response to excess gas generated inside the battery and performs a venting function.

[0106] The electrode assembly 15r can be formed by winding or stacking the first electrode plate, the diaphragm, and the second electrode plate. When the electrode assembly 15r is wound, the winding axis can be parallel to the longitudinal direction of the housing 15a. In some other embodiments, the electrode assembly 15r is stacked rather than wound, but the shape of the electrode assembly 15r is not limited in this disclosure.

[0107] Furthermore, the electrode assembly 15r can be a Z-stacked electrode assembly, wherein a positive electrode plate and a negative electrode plate are inserted into both sides of the diaphragm and then bent (or folded) into a Z-stack. Additionally, multiple electrode assemblies 15r can be stacked such that the long sides of the electrode assemblies 15r are adjacent to each other and housed within a housing 15a, and the number of electrode assemblies 15r in the housing 15a is not limited in this disclosure. A first electrode plate of the electrode assembly 15r can be used as a negative electrode, and a second electrode plate can be used as a positive electrode. Of course, the reverse is also possible.

[0108] The first electrode plate can be formed by applying a first electrode active material, such as graphite or carbon, to a first electrode current collector formed of a metal foil, such as copper, copper alloy, nickel, or nickel alloy. The first electrode plate may include a first electrode tab (e.g., a first uncoated portion) 15p for areas where the first electrode active material is not applied.

[0109] The first electrode terminal 15p can be used as a current flow path between the first electrode plate and the first current collector 15m. In some embodiments, when manufacturing the first electrode plate, the first electrode terminal 15p is formed by being pre-cut to protrude toward one side of the electrode assembly, or the first electrode terminal 15p protrudes toward one side of the electrode assembly more than (e.g., farther or beyond) the diaphragm without being separately cut.

[0110] The second electrode plate can be formed by applying a second electrode active material, such as a transition metal oxide, to a second electrode current collector formed of a metal foil such as aluminum or an aluminum alloy. The second electrode plate may include a second electrode tab (e.g., a second uncoated portion) 15q for areas where the second electrode active material is not applied.

[0111] The second electrode terminal 15q can be used as a current flow path between the second electrode plate and the second current collector 15n. In some embodiments, when manufacturing the second electrode plate, the second electrode terminal 15q can be formed by being pre-cut to protrude to the other side (e.g., opposite side) of the electrode assembly, or the second electrode terminal 15q can protrude to the other side of the electrode assembly more than (e.g., further or beyond) the diaphragm without being cut separately.

[0112] As described above, the first electrode active material and the second electrode active material can be formed using a double-slit mold. Furthermore, each of the first electrode active material and the second electrode active material can be formed as a single layer or two layers.

[0113] exist Figure 4 In this embodiment, the first electrode terminal 15p and the second electrode terminal 15q are illustrated as being located on the right and left sides of the electrode assembly 15r, respectively. However, in some other embodiments, the first electrode terminal 15p and the second electrode terminal 15q may both be located on the right or left side of the electrode assembly 15r.

[0114] Here, for ease of explanation, the left and right sides of the electrode assembly 15r are based on, as shown below. Figure 4 The battery is shown. "Left side" refers to the side of the vertical surface of the electrode assembly 15r that engages with the second current collector 15n, and "right side" refers to the opposite side that engages with the first current collector 15m. Therefore, the terms "left side" and "right side" for the electrode assembly 15r used above can change when the battery is rotated left-right or up-down.

[0115] The separator prevents or substantially reduces short circuits between the first and second electrodes while allowing lithium ions to move between them. The separator can be made of, for example, polyethylene membranes, polypropylene membranes, polyethylene-polypropylene membranes, etc.

[0116] In some embodiments, the electrode assembly 15r is housed together with the electrolyte in a housing 15a.

[0117] In the electrode assembly 15r, the first current collector 15m and the second current collector 15n can be welded and connected to the first electrode terminal 15p extending from the first electrode plate and the second electrode terminal 15q extending from the second electrode plate, respectively.

[0118] The first current collector 15m and the second current collector 15n are respectively connected to the first terminal 15d and the second terminal 15e via connecting members 15k. In some embodiments, the connecting members 15k may each have a threaded outer peripheral surface and can be fastened to the first terminal 15d and the second terminal 15e by threaded connection. However, this disclosure is not limited thereto. For example, the connecting members 15k may also be riveted or welded to the first terminal 15d and the second terminal 15e.

[0119] Figure 5 This is a perspective view of a slit mold unit 20 for manufacturing a secondary battery according to an embodiment of the present disclosure.

[0120] refer to Figure 5 According to one embodiment of the present disclosure, the slit mold unit 20 may include a double slit mold 30, a rear support body 35, an upper mold support member, and a gap adjustment part.

[0121] like Figure 17 As shown, the double slit mold 30 is configured to correspond to (e.g., align with) the support roller 71 and is configured to coat the substrate 100 with an active material as the substrate 100 passes the support roller 71.

[0122] Furthermore, the double-slit mold 30 can be mounted on the base 23. The base 23 horizontally supports the double-slit mold 30, and the position of the base 23 can be adjusted by the gap adjustment part in the direction of arrow a or the opposite direction. For ease of description, the direction of arrow a is defined as the forward direction toward the support roller 71, and its opposite direction is defined as the rearward direction.

[0123] The base 23 is a block-shaped component with height and can be supported on the guide rail 21a. The position of the base 23 can be adjusted in the forward or backward direction while being supported on the guide rail 21a.

[0124] The gap adjustment unit can adjust the gap between the upper discharge section 30b and the lower discharge section 30a (e.g., upper discharge port and lower discharge port) and the substrate 100 supported on the support roller 71 by moving the double slit mold 30.

[0125] The gap adjustment section may include a servo motor 24 and a lead screw 24a. The servo motor 24 can... Figure 17 The controller 75 shown receives a control signal to rotate the lead screw 24a axially. The lead screw 24a is a horizontally extending mechanical component, and a portion of the lead screw 24a can be threadedly connected to the base 23. As the lead screw 24a rotates axially via the servo motor 24, the base 23 moves (e.g., linearly). The transmission structure of the base 23 can be implemented in various ways through other embodiments.

[0126] The lower mold 31, the center mold 32, and the upper mold 33 are assembled together to form a single structural body, and can provide (e.g., can form) a lower discharge section 30a and an upper discharge section 30b. Figure 7 As shown, the lower discharge section 30a and the upper discharge section 30b are channels for discharging active substances in a slurry state toward the substrate 100.

[0127] The lower mold 31 is the main structural body fixed to the base 23, and supports the central mold 32 at its upper part (or upper surface). An upward-opening storage chamber for containing active substances can be formed in the lower mold 31.

[0128] The central mold 32 is a structural body configured to cover the lower mold 31 while being fixed to it. A lower discharge portion 30a can be provided between the central mold 32 and the lower mold 31 (e.g., it can be formed between them). An upper discharge portion 30b can be provided between the central mold 32 and the upper mold 33. The upper surface of the central mold 32 is a horizontal surface that can slidably support the upper mold 33.

[0129] The upper mold 33 is mounted on the central mold 32 and can slide back and forth while in close contact with the upper surface of the central mold 32. The upper mold 33 is made slidable to further adjust its position (e.g., to adjust the position of the upper mold 33 relative to the central mold 32 and the lower mold 31). Furthermore, by adjusting the position of the upper mold 33 relative to the central mold 32 and the lower mold 31, the gap between the upper discharge portion 30b and the support roller can be adjusted when a thickness difference occurs between the upper and lower coatings due to differences in the specific gravity of the slurry. Since the position of the upper mold 33 can be adjusted as described above, contamination of uncoated portions can be prevented when coating active materials, and the active materials at the start and end points of coating are not swept away.

[0130] Multiple vertical elongated holes (e.g., slits) 33a may be formed in the upper mold 33. The vertical elongated holes 33a are holes extending in the front-to-back direction (or sliding direction) of the upper mold 33. The vertical elongated holes 33a pass vertically through the upper mold 33 to allow the fixing bolts 33c to pass through them. The fixing bolts 33c are mold fixing members used to fix the upper mold 33 to the central mold 32.

[0131] After determining the final position of the upper mold 33, the fixing bolts 33c are inserted into each vertical elongated hole 33a, and the lower end of the fixing bolts 33c is threaded to the center mold 32, thereby maintaining the upper mold 33 in a fixed state relative to the center mold 32.

[0132] Furthermore, the rear support body 35 can be installed on the rear side of the double slit mold 30. The rear support body 35 is a structural body having a lower end portion fixed to the upper portion of the base 23, and can be connected to the rear surface of the double slit mold 30 by a plurality of tension bolts 35e. The rear support body 35 is located on the side opposite to the support roller 71, with the double slit mold 30 between them, and the rear support body 35 can support the double slit mold 30 toward the support roller 71.

[0133] Furthermore, a receiving groove 35a can be formed at the upper end of the rear support body 35. The receiving groove 35a can accommodate the rear end portion of the upper mold 33 when the upper mold 33 moves rearward in a direction away from the support roller 71. Figure 6The diagram shows the rear end portion of the upper mold 33 inserted into the receiving groove 35a. Furthermore, the gap plate 39 (described in more detail below) can be inserted into the receiving groove 35a.

[0134] The upper mold support allows the upper mold 33 to slide forward when mounted on the double-slit mold 30, thereby adjusting and maintaining the gap between the front end portion of the upper mold 33 and the substrate 100. For example, the upper mold support moves the upper mold 33 toward the support roller 71 and maintains the changed state (or changed position).

[0135] The upper mold support may include a gap plate 39 and an upper mold tensioning member. The gap plate 39 is a plate-shaped member with a thickness. The gap plate 39 can have various thicknesses. For example, a set of gap plates with various thicknesses can be provided for selective use. The thickness of the gap plate 39 can range from about 1 μm to about 300 μm.

[0136] like Figure 5 As shown, the gap plate 39 can be inserted between the rear support body 35 and the upper mold 33. When the gap plate 39 is inserted, the upper mold 33 can move forward in the same way due to the thickness of the gap plate 39. When a thicker gap plate 39 is inserted, the upper mold 33 can move forward further (e.g., the additional thickness of the thicker gap plate 39 can be moved forward).

[0137] The upper mold tensioning member can tension the upper mold 33 toward the rear support body 35 to allow the upper mold 33 to be in close contact with the gap plate 39. In this embodiment, the upper mold tensioning member is the uppermost tensioning bolt 35e among the three tensioning bolts inserted into the rear support body 35.

[0138] The tensioning bolt 35e passes through the rear support body 35 and is threaded to the rear surface of the upper mold 33. Since the rear support body 35 is fixed to the base 23, the upper mold 33 can be tensioned toward the rear support body 35e when the tensioning bolt 35e is tightened.

[0139] The method for adjusting the position of the upper mold 33 using the gap plate 39 is as follows: First, while separating or loosening the fixing bolt 33c inserted into the vertical elongated hole 33a and the uppermost tension bolt 35e, the upper mold 33 is moved forward. Next, the gap plate 39 is inserted into the receiving groove 35a, and the top tension bolt 35e is tightened again (e.g., further tightened). When the tension bolt 35e is tightened, the upper mold 33 is pulled by the tension bolt 35e to make it in close contact with the gap plate 39. The position adjustment of the upper mold 33 is thus completed. Figure 7 This shows the upper mold moving backward to its maximum extent. Figure 8 This shows the alignment of the upper mold with the front end portion of the center mold, and Figure 9 This shows the upper mold moving forward to its maximum extent. This will be described in more detail below.

[0140] Figure 6 This is an example of mold 33 in... Figure 5 The side view of the double-slit mold 30 in its fully rearward-moved state, and Figure 7 This is an example Figure 6 Enlarged view of the discharge sections 30a and 30b of the double slit mold shown.

[0141] As shown in the figure, the lower end of the upper mold 33 is inserted into the receiving groove 35a of the rear support body 35. The gap plate 39 is not used. Because the gap plate 39 is omitted, the upper mold 33 is in a state of maximum rearward movement. Figure 7 As shown, in this state (or configuration), the front end of the upper mold 33 is spaced apart from the front end of the connecting center mold 32 and the front end of the lower mold 31 by a vertical line Z. In this way, since the upper mold 33 moves backward, the thickness of the slurry discharged from the upper discharge section 30b can be increased.

[0142] Figure 8 This illustrates the application of gap plates. Figure 5 The side view of the state of the double-slit mold shown, and Figure 9 This is an example Figure 8 An enlarged view of the discharge section of the double-slit mold shown.

[0143] Gap plate 39 is applied to Figure 8 The double-slit mold 30 is shown. A gap plate 39 is inserted between the rear support body 35 and the upper mold 33. (As shown...) Figure 9 As shown, by inserting the gap plate 39, the front end of the upper mold 33 can be closer to the substrate 100. The thickness of the slurry discharged through the upper discharge section 30b is... Figure 6 and Figure 7 The thickness in the configuration can be relatively thin.

[0144] Figure 10 is an example ratio Figure 8 The side view of the double-slit mold to which the gap plate of varying thickness is applied is shown. Figure 11 This is an example Figure 10 An enlarged view of the discharge section of the double-slit mold shown. Figure 10 As shown, when the application is more Figure 8 When the gap plate 39 shown has a gap plate thickness, the front end portion of the upper mold 33 is closer to the substrate 100.

[0145] Therefore, as explained above, the gap between the upper mold 33 and the substrate 100 can be adjusted according to (for example, by selecting) the thickness of the gap plate 39.

[0146] Figure 12 This is a perspective view of a slit mold unit according to another embodiment of the present disclosure, and Figure 13 This is an example Figure 12 The side view of the double-slit mold shown. Furthermore, Figure 14 and Figure 15 It is used to describe regulation Figure 13 A diagram showing the method of positioning the upper mold.

[0147] As shown in the figure, a crossbar 35k can be further provided on the rear support body 35. The crossbar 35k is part of the rear support body 35 and can cover the rear surface of the upper mold 33.

[0148] Furthermore, an internally threaded hole 35m can be formed in the rear support body 35. The internally threaded hole 35m is a horizontally extending internally threaded hole. In addition, a retaining groove 33g is formed in the rear portion of the upper mold 33. The retaining groove 33g is a groove positioned along the extension line of the internally threaded hole 35m and can rotatably accommodate the locking disc 36f. The locking disc 36f can rotate while being confined within the retaining groove 33g.

[0149] Furthermore, the gap adjuster 36 can be used as an upper mold support. The gap adjuster 36 adjusts the gap between the upper mold 33 and the rear support body 35. The gap adjuster 36 can be further provided. The gap adjuster 36 is an operator-operated component and may include an external threaded rod 36e, a locking disc 36f, and a rotating dial 36a.

[0150] The external threaded rod 36e is a mechanical component that is threaded into the internal threaded hole 35m and is axially rotatable. One end of the external threaded rod 36e can be connected to the upper mold 33 via a locking disc 36f. The other end of the external threaded rod 36e can extend rearward. Furthermore, a rotating dial 36a can be fixed to the other end of the external threaded rod 36e. When the rotating dial 36a rotates, the entire clearance adjuster 36 can rotate axially, causing the upper mold 33 to move linearly.

[0151] The locking disc 36f can be a disc-shaped component with thickness and diameter. The locking disc 36f can rotate while being confined in the retaining groove 33g. The rotating dial 36a is fixed to the other end of the externally threaded rod 36e and can transmit rotational force supplied from the outside to the externally threaded rod 36e.

[0152] Figure 16 This is an example Figure 12 A front view of the gap adjuster 36 shown.

[0153] As shown in the figure, a scale 35p can be displayed on the crossbar 35k of the rear support body 35. The scale has a substantially circular shape around the rotating dial 36a and can indicate the rotation angle of the rotating dial 36a.

[0154] Furthermore, a scale index 36b is marked on the rotating dial 36a. For example, scale index 36b is an arrow indicating scale 35p. The rotation angle of the gap adjuster 36 can be precisely determined using scale index 36b and scale 35p. When determining the angle of the gap adjuster 36, the forward and backward movement distance of the upper mold 33 can be determined by simplified calculations.

[0155] In addition, such as Figure 12 As shown, guide grooves 33e can be formed on both sides of the upper mold 33. The guide grooves 33e are horizontally extending straight grooves. Furthermore, horizontally extending arms 35f are provided on both sides of the rear support body 35. The horizontally extending arms 35f are inserted into the guide grooves 33e and can guide the sliding movement of the upper mold 33.

[0156] Figure 17 This is a schematic diagram of a secondary battery manufacturing apparatus 70 according to an embodiment of the present disclosure.

[0157] As shown in the figure, according to this embodiment, the secondary battery manufacturing apparatus 70 may include a substrate conveying unit 60, a slit mold unit 20, and a controller 75.

[0158] The substrate transport unit 60 can transport the substrate 100 along a transport path. The substrate transport unit 60 may include a plurality of guide rollers 73 and support rollers 71. The guide rollers 73 can maintain the tension of the substrate 100 during transport. In addition, the support rollers 71 correspond to (e.g., are aligned with) the double slit mold 30 and can support the substrate 100 when the active material is coated on the substrate 100. In addition, as described above, the controller 75 can control the operation of the servo motor 24.

[0159] Figure 18 This is a perspective view of a secondary battery pack manufactured by a secondary battery manufacturing apparatus according to an embodiment of the present disclosure.

[0160] The secondary battery pack 50 can be manufactured by embedding multiple secondary battery modules within a housing designed for mounting on a product (e.g., an end-use product). The housing may include fastening portions for mounting on the product and a power receptacle portion. Figure 18 For ease of illustration, the busbars, cooling units, external terminals, and other related components used for the electrical connection of the secondary battery are omitted.

[0161] The secondary battery pack can be installed in the vehicle. The vehicle can be, for example, an electric vehicle or a hybrid vehicle (e.g., a plug-in hybrid vehicle). The vehicle includes four-wheel drive vehicles or two-wheel drive vehicles. Figure 19 This is an example Figure 18 The diagram illustrates the state of a secondary battery pack applied to a vehicle. It exemplifies a configuration in which the secondary battery pack 50, according to an embodiment of the present disclosure, is mounted on (or attached to) the lower part of the vehicle body. The vehicle operates by means of electricity received from the secondary battery pack 50 according to an embodiment of the present disclosure.

[0162] According to the secondary battery manufacturing apparatus and the slit mold unit for manufacturing secondary batteries formed as described above, the single gap between the slurry discharge section and the support roller can be adjusted, thereby enabling the formation of multilayer electrode layers with different thicknesses, and preventing contamination of uncoated portions or dragging of the front and rear ends of coated portions when performing intermittent (e.g., patterned) coating.

[0163] Although the present disclosure has been described above with reference to embodiments thereof, the present disclosure is not limited thereto. Various modifications and variations can be made to it within the spirit of the present disclosure as defined in the appended claims and their equivalents.

Claims

1. A secondary battery manufacturing apparatus, comprising: A substrate transport unit is configured to transport substrates along a transport path; A double-slit mold is configured to coat the substrate with an active material and includes a lower mold, a central mold fixed on the lower mold, and an upper mold slidably mounted on the upper surface of the central mold. The double-slit mold has a lower discharge port between the lower mold and the central mold and an upper discharge port between the central mold and the upper mold. A gap adjustment section is configured to move the double-slit mold to adjust the gap between the upper discharge port and the lower discharge port and the substrate; A controller is configured to drive the gap adjustment unit; as well as An upper mold support is configured to allow the upper mold to slide, thereby adjusting and maintaining the gap between the upper mold and the substrate.

2. The secondary battery manufacturing apparatus according to claim 1, further comprising a rear support body, The substrate conveying section includes a support roller configured to support the substrate when the active material is coated onto it. The rear support body is configured to support the double-slit mold toward the support roller on a side opposite to the support roller, the double-slit mold being located between the rear support body and the support roller.

3. The secondary battery manufacturing apparatus according to claim 2, wherein the upper mold support comprises: A gap plate is located between the rear support body and the upper mold. as well as An upper mold tensioning member is configured to tension the upper mold toward the rear support body, such that the upper mold is in close contact with the gap plate.

4. The secondary battery manufacturing apparatus according to claim 2 or 3, wherein the rear support body has a receiving groove for receiving the rear end portion of the upper mold when the upper mold moves rearward in a direction away from the support roller.

5. The secondary battery manufacturing apparatus according to claim 1, wherein: The upper mold has a plurality of vertical elongated holes extending in the sliding direction of the upper mold; and The upper mold is fixed to the central mold by a plurality of mold fixing components, each of the plurality of mold fixing components having a vertical elongated hole passing through the upper mold and connected to the lower end portion of the central mold.

6. The secondary battery manufacturing apparatus according to claim 1, further comprising a base below and supporting the double-slit mold. The gap adjustment unit includes a servo motor configured to be driven by the controller and to move the base linearly.

7. The secondary battery manufacturing apparatus according to claim 2, wherein: The rear support body has an internal threaded hole that extends horizontally through the rear support body. and The upper mold support component includes: An externally threaded rod is threaded into the internally threaded hole and is axially rotatable, with one end portion of the externally threaded rod connected to the upper mold and the other end portion of the externally threaded rod extending rearward; as well as A rotating dial is fixed to the other end portion of the externally threaded rod and configured to transmit rotational force to the externally threaded rod.

8. The secondary battery manufacturing apparatus according to claim 7, wherein: A disc-shaped locking disc is located at one end portion of the externally threaded rod; and The upper mold has a retaining groove configured to rotatably restrict the locking disc.

9. The secondary battery manufacturing apparatus according to claim 7, wherein: The rear support body includes a scale configured to indicate the rotation angle of the rotating dial; and The rotating dial is marked with a scale index configured to indicate the scale.

10. The secondary battery manufacturing apparatus according to claim 2 or 7, wherein: The upper mold has a horizontally extending guide groove; and The rear support body includes a horizontal extension arm that is located in the guide groove and configured to guide the sliding movement of the upper mold.

11. A slit mold unit for manufacturing secondary batteries, the slit mold unit comprising a double-slit mold, the double-slit mold comprising: Lower mold; The central mold is fixed to the lower mold; as well as The upper mold is slidably mounted on the upper surface of the central mold. A lower discharge port is formed between the lower mold and the central mold, and an upper discharge port is formed between the central mold and the upper mold. The lower discharge port and the upper discharge port are configured to discharge the active material to be coated on the substrate.

12. The slit mold unit of claim 11, further comprising an upper mold support configured to allow the upper mold to slide, thereby adjusting and maintaining the gap between the upper mold and the substrate.

13. The slit mold unit according to claim 12, further comprising a rear support body, The dual-slit mold is aligned with a support roller, which is configured to support the substrate to be coated with the active material. The rear support body is configured to support the double-slit mold toward the support roller on a side opposite to the support roller, the double-slit mold being located between the rear support body and the support roller.

14. The slit mold unit according to claim 13, wherein the upper mold support comprises: A gap plate is located between the rear support body and the upper mold. as well as An upper mold tensioning member is configured to tension the upper mold toward the rear support body, such that the upper mold is in close contact with the gap plate.

15. The slit mold unit according to claim 13 or 14, wherein the rear support body has a receiving groove for receiving a rear end portion of the upper mold when the upper mold moves rearward in a direction away from the support roller.

16. The slit mold unit according to claim 11, further comprising: A base is located below the double-slit mold and supports the double-slit mold; as well as A gap adjustment unit is configured to adjust the gap between the double-slit mold and the substrate by linearly moving the base.

17. The slit mold unit of claim 13, wherein the rear support body has an internally threaded hole that extends horizontally within the rear support body, and The upper mold support includes: An externally threaded rod is threaded into the internally threaded hole and is axially rotatable. One end of the externally threaded rod is connected to the upper mold and the other end of the externally threaded rod extends rearward. as well as A rotating dial is fixed to the other end portion of the externally threaded rod and configured to transmit rotational force to the externally threaded rod.

18. The slit mold unit according to claim 17, wherein: A disc-shaped locking disc is located at one end portion of the externally threaded rod; and The upper mold has a retaining groove configured to rotatably restrict the locking disc.

19. The slit mold unit according to claim 17, wherein: The rear support body has a scale configured to indicate the rotation angle of the rotating dial; and The rotating dial has a scale index configured to indicate the scale.

20. The slit mold unit according to claim 13 or 17, wherein: The upper mold has a horizontally extending guide groove; and The rear support body includes a horizontal extension arm that is inserted into the guide groove and configured to guide the sliding movement of the upper mold.

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