Apparatus for manufacturing secondary battery and electrode plate cutting unit

Abstract

The present disclosure provides an apparatus for manufacturing a secondary battery and an electrode plate cutting unit, by fixedly pressing a lower cutter using a high-strength spring, the lower cutter having good fixing strength and stably maintaining cutting accuracy, to prevent defitting of an active material at the time of cutting an electrode plate and to improve quality of a cut surface. The apparatus includes: a conveying unit configured to convey an electrode plate as a cutting target along a conveying path; a winding unit configured to receive and wind the cut electrode plate conveyed by the conveying unit; and a cutting unit, the upper cutter is installed above the conveying path so as to move upwards and downwards, and the fixing body is fixed below the conveying path so as to provide supporting strength. A lower cutter supported by the fixed body and configured to cut the electrode plate by a cross motion with the upper cutter; and an elastic support elastically supporting the lower cutter toward the fixed body to maintain a fixed state of the lower cutter with respect to the fixed body.

Description

Technical Field

[0001] This disclosure relates to the manufacture of secondary batteries, and more specifically, to an apparatus for manufacturing secondary batteries and an electrode plate cutting unit for secondary batteries. Background Technology

[0002] Unlike primary batteries, which cannot be recharged, secondary batteries are batteries that can be charged and discharged. A secondary battery typically includes an electrode assembly (including a positive electrode plate, a separator, and a negative electrode plate), a housing (or can) for containing the electrode assembly, a substrate tab formed by extending the uncoated portion of each electrode plate of the electrode assembly, and external terminals connected to the substrate tab, etc.

[0003] The information disclosed in this background section is intended to enhance understanding of the background of this disclosure, and therefore may contain information that does not constitute related (or prior art). Summary of the Invention

[0004] This disclosure aims to provide an apparatus for manufacturing secondary batteries and an electrode plate cutting unit for secondary batteries, wherein the lower cutter has good fixing strength and stably maintains cutting accuracy, thereby preventing the deintercalation of active material during electrode plate cutting and improving the quality of the cut surface.

[0005] According to an aspect of this disclosure, an apparatus for manufacturing a secondary battery is provided, the apparatus comprising: a conveying unit configured to convey an electrode plate as a cutting target along a conveying path; a winding unit configured to receive and wind the cut electrode plate conveyed by the conveying unit; and a cutting unit having an upper cutter mounted above the conveying path for upward and downward movement, a fixed body fixed below the conveying path to provide support strength, a lower cutter supported by the fixed body and configured to cut the electrode plate by intersecting movement with the upper cutter, and an elastic support member elastically supporting the lower cutter toward the fixed body to maintain the lower cutter in a fixed state relative to the fixed body.

[0006] According to another aspect of this disclosure, an electrode plate cutting unit for a secondary battery is provided, the electrode plate cutting unit comprising: an upper cutter mounted above a conveying path of an electrode plate moving along a conveying path; a fixed body fixed below the conveying path to provide support strength; a lower cutter supported by the fixed body to cut the electrode plate by intersecting movement with the upper cutter; and an elastic support member elastically supporting the lower cutter toward the fixed body to maintain the lower cutter in a fixed state relative to the fixed body.

[0007] The aspects and features of this disclosure are not limited to those described herein, and those skilled in the art will clearly understand from the description of this disclosure other aspects and features not specifically mentioned herein. Attached Figure Description

[0008] The present disclosure and its other objects, features, and advantages will become more apparent to those skilled in the art from the detailed description of exemplary embodiments thereof with reference to the accompanying drawings, wherein:

[0009] Figure 1 This is a schematic diagram illustrating an electrode assembly of a secondary battery that can be manufactured by an apparatus for manufacturing a secondary battery according to embodiments of the present disclosure;

[0010] Figure 2 This is an example application. Figure 1 An internal view of the electrode assembly of a pouch cell;

[0011] Figure 3 This is a cross-sectional view illustrating a cylindrical battery manufactured by an apparatus for manufacturing a secondary battery according to an embodiment of the present disclosure;

[0012] Figure 4 This is an external perspective view illustrating a prismatic battery that can be manufactured by an apparatus for manufacturing a secondary battery according to an embodiment of the present disclosure.

[0013] Figure 5 It is along Figure 4 A cross-sectional view of line AA in the diagram;

[0014] Figure 6 This is a view illustrating the basic configuration of an apparatus for manufacturing secondary batteries according to an embodiment of the present disclosure;

[0015] Figure 7 This is an example Figure 6 A side view showing the upper cutter moving downwards in the cutting unit;

[0016] Figure 8 It is used to describe Figure 7 A cross-sectional view of the internal structure of the cutting unit;

[0017] Figure 9 This is an example Figure 7 An exploded perspective view of a modified example of a cut cell;

[0018] Figure 10 This is an example Figure 9 A view of a modified example of the cutting unit shown;

[0019] Figure 11 This is a cross-sectional view illustrating another example of a cutting unit according to an embodiment of the present disclosure;

[0020] Figure 12 This is a view illustrating yet another example of a cutting unit according to an embodiment of the present disclosure;

[0021] Figure 13 This is an example Figure 12 A view showing a modified example of the cutting unit; and

[0022] Figure 14 and Figure 15 This is a view illustrating yet another example of a cutting unit according to an embodiment of the present disclosure. Detailed Implementation

[0023] 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 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 be his / her own lexicographer to appropriately define terminology and concepts in order to best describe his / her disclosure.

[0024] The embodiments described in this specification and the configurations shown in the accompanying drawings are merely some embodiments of this disclosure and do not represent all aspects, features, and embodiments of this disclosure. Therefore, it should be understood that various equivalents and modifications may exist that can replace or modify one or more embodiments or features described herein at the time of filing this application.

[0025] It will be understood that if a component or layer is described as being "on" another component or layer, "connected to," or "attached to" another component or layer, then it can be directly on, connected to, or attached to the other component or layer, or one or more intermediate components or layers may exist. When a component or layer is described as being "directly on" another component or layer, "directly connected to," or "directly attached to" another component or layer, then no intermediate components or layers exist. For example, if a first component is described as being "attached" or "connected" to a second component, then the first component can be directly attached to or connected to the second component, or the first component can be indirectly attached to or connected to the second component via one or more intermediate components.

[0026] In the accompanying drawings, the dimensions of various elements, layers, etc., may be enlarged for clarity of illustration. The same reference numerals indicate the same elements. As used herein, the term "and / or" includes any and all combinations of one or more associated listed items. Furthermore, the use of "may" when describing embodiments of this disclosure refers to "one or more embodiments of this disclosure." Expressions such as "at least one of..." and "any one of..." modify the entire list of elements if they precede / follow the list of elements, without modifying any individual element in the list. When phrases such as "at least one of A, B, and C," "at least one of A, B, or C," "at least one selected from the group of A, B, and C," or "at least one selected from 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. 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 apparent to a person of ordinary skill in the art.

[0027] It will be understood that while the terms first, second, third, etc., may be used herein to describe various elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms are used to distinguish one element, component, region, layer, or segment from another element, component, region, layer, or segment. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment.

[0028] For ease of description, this document uses spatial relative terms such as “below,” “under,” “down,” “above,” and “above” to describe the relationship between one element or feature and another element or feature as shown in the figures. It will be understood that spatial relative terms are intended to encompass different orientations of the device in use or operation, in addition to the orientation depicted in the figures. For example, if the device in the figures is flipped, an element described as “below” or “under” other elements or features can be oriented as “above” or “above” other elements or features. Therefore, the term “below” can encompass both above and below orientations. The device can be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptors used herein should be interpreted accordingly.

[0029] The terminology used herein is for the purpose of describing embodiments of this disclosure and is not intended to limit this disclosure. As used herein, the singular forms are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that, if used in this specification, the terms “comprising” and / or “including” 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.

[0030] Furthermore, any numerical range disclosed and / or enumerated herein is intended to include all subranges with the same numerical precision contained within the enumerated range. For example, the range “1.0 to 10.0” is intended to include all subranges between the enumerated minimum value of 1.0 and the enumerated maximum value of 10.0 (and including both the enumerated minimum value of 1.0 and the enumerated maximum value of 10.0), i.e., a minimum value equal to or greater than 1.0 and a maximum value equal to or less than 10.0, such as 2.4 to 7.6. Any maximum numerical limit enumerated herein is intended to include all lower numerical limits contained therein, and any minimum numerical limit enumerated in this specification is intended to include all higher numerical limits contained therein. Therefore, the applicant reserves the right to amend this specification, including the claims, to expressly enumerate any subranges contained within the scope expressly enumerated herein. All such ranges are intended to be inherently described in this specification such that any modifications made to expressly enumerate any such subranges will comply with the requirements of patent regulations.

[0031] Referring to two compared elements, features, etc., as “identical” may mean that they are “substantially identical.” Therefore, the phrase “substantially identical” can include cases with deviations considered low in the art, such as less than 5%. Furthermore, if a parameter is described as consistent within a given region, this may mean that it is consistent in terms of its mean.

[0032] Throughout this specification, unless otherwise stated, each element may be singular or plural.

[0033] Placing any element "above (or below)" or "on (below)" another element may mean that the arbitrary element can contact the upper (or lower) surface of the element, and that the other element may be located between the element and any element positioned on (or below) the element.

[0034] Furthermore, it will be understood that if a component is referred to as “connected,” “linked,” or “attached” to another component, then the components can be directly “connected,” “linked,” or “attached” to each other, or another component can be “between” the components.

[0035] Throughout this specification, unless otherwise stated, the statement "A and / or B" refers to A, B, or A and B. In other words, "and / or" includes any or all combinations of the listed items. Unless otherwise indicated, the statement "C to D" refers to C and below D.

[0036] The terminology used herein is for the purpose of describing embodiments of this disclosure and is not intended to limit this disclosure.

[0037] Electrode assemblies housed in a housing include stacked and core-type assemblies. Core-type electrode assemblies are manufactured by winding continuously supplied electrode plates using a winding device.

[0038] The winding apparatus includes an electrode plate cutter. The electrode plate cutter is a device for cutting electrode plates at designed intervals and includes an upper cutter and a lower cutter. The upper cutter is mounted above the conveying path of the electrode plates, and the lower cutter is mounted below the conveying path; the upper and lower cutters cut the electrode plates through a cross motion.

[0039] The lower cutter is manually secured using bolts. For example, the lower cutter is in close contact with a fixed structure and connected by bolts. However, bolt-secured lower cutters have disadvantages such as weak fixing strength and the bolts loosening slightly due to vibration during operation. Furthermore, because the lower cutter is manually secured, the setup varies depending on the operator.

[0040] Figure 1 This is a schematic diagram illustrating an electrode assembly of a secondary battery that can be manufactured by an apparatus for manufacturing a secondary battery according to embodiments of the present disclosure.

[0041] 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.

[0042] In other embodiments, the electrode assembly 10 may be stacked rather than wound, and 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 in which positive and negative electrode plates are inserted into both sides (e.g., opposite sides) of a diaphragm and then bent (or folded) into a Z-stacked configuration.

[0043] Furthermore, one or more electrode assemblies 10 may be stacked (e.g., arranged) such that the long sides of the electrode assemblies 10 are adjacent to each other and housed in a housing, and the number of electrode assemblies 10 in the housing is not limited in this disclosure. A first electrode plate 10a of the electrode assembly 10 may be used as a negative electrode, and a second electrode plate 10e may be used as a positive electrode. Of course, the reverse is also possible.

[0044] The first electrode plate 10a can be formed by coating (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 10g (e.g., a first uncoated portion) as a region not coated with the first electrode active material. The first electrode tab 10g can be connected to an external first terminal. In some embodiments, when manufacturing the first electrode plate 10a, the first electrode tab 10g can be formed by being pre-cut to protrude (or from) one side of the electrode assembly 10, or the first electrode tab 10g can protrude to one side of the electrode assembly 10 more than (e.g., beyond or beyond) the diaphragm 10c without being separately cut.

[0045] The second electrode plate 10e can be formed by coating (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 10h (e.g., a second uncoated portion) as a region uncoated by the second electrode active material. 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.

[0046] 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.

[0047] 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 (e.g., see...). Figure 2 In cylindrical or prismatic secondary batteries, the electrode assembly 10 can be housed in a cylindrical or prismatic metal casing (e.g., see...). Figure 3 and Figure 5 ).

[0048] A description of the materials of the electrode plates that can be used in the electrode assembly described herein is given.

[0049] For 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 the composite oxides of lithium with metals selected from cobalt, manganese, nickel, and combinations thereof can be used.

[0050] The composite oxide can be a lithium transition metal composite oxide, and examples of it can include lithium nickel oxides, lithium cobalt oxides, lithium manganese oxides, lithium iron phosphate compounds, cobalt-free nickel manganese oxides, or combinations thereof.

[0051] 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 aMn 1-g G g PO4 (0.90 ≤ a ≤ 1.8, 0 ≤ g ≤ 0.5); Li (3-f) Fe2(PO4)3 (0 ≤ f ≤ 2); Li a FePO4 (0.90 ≤ a ≤ 1.8).

[0052] In the molecular formulae herein, A is Ni, Co, Mn or a combination thereof; X is Al, Ni, Co, Mn, Cr, Fe, Mg, Sr, V, a rare earth element 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 is Mn, Al or a combination thereof.

[0053] The positive electrode for a lithium secondary battery may include a positive electrode substrate and a positive electrode active material layer formed on the positive electrode 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.

[0054] Based on 100 wt% of the positive electrode active material layer, the content of the positive electrode active material may be in the range of about 90 wt% to about 99 wt%, and based on 100 wt% of the positive electrode active material layer, the contents of the binder and the conductive material are respectively in the range of about 0.5 wt% to about 5 wt%.

[0055] The positive electrode substrate may be an aluminum (Al) foil, but is not limited thereto.

[0056] The negative electrode active material may include a material capable of reversibly inserting / extracting lithium ions, lithium metal, a lithium metal alloy, a material capable of doping and dedoping lithium, or a transition metal oxide.

[0057] 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, mesophase pitch carbide, and sintered coke, etc.

[0058] Si-based negative electrode active materials or Sn-based negative electrode active materials may be used as materials capable of doping and dedoping lithium. Si-based negative electrode active materials may be silicon, a silicon-carbon composite, SiOx (0 < x ≤ 2), a Si-based alloy or a combination thereof.

[0059] The silicon-carbon composite may be a composite of silicon and amorphous carbon. According to an embodiment, the silicon-carbon composite may be in the form of silicon particles and amorphous carbon coated on the surface of the silicon particles.

[0060] The silicon-carbon composite may further include crystalline carbon. For example, the silicon-carbon composite may include a core comprising crystalline carbon and silicon particles, and an amorphous carbon coating on the surface of the core.

[0061] The negative electrode for a lithium secondary battery may include a negative electrode substrate and a negative electrode active material layer disposed on the negative electrode 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.

[0062] For example, the negative electrode active material layer may include about 90 wt% to about 99 wt% of negative electrode active material, about 0.5 wt% to about 5 wt% of binder, and about 0 wt% to about 5 wt% of conductive material.

[0063] Non-aqueous binders, aqueous binders, dry binders, or combinations thereof can be used as binders. When an aqueous binder is used as the negative electrode binder, it may further include a cellulose-based compound capable of imparting viscosity.

[0064] For the negative electrode substrate, one can be selected from copper foil, nickel foil, stainless steel foil, titanium foil, nickel foam, copper foam, polymer substrate coated with conductive metal, and combinations thereof.

[0065] Electrolytes used in lithium secondary batteries may include non-aqueous organic solvents and lithium salts.

[0066] Non-aqueous organic solvents serve as a medium through which ions participating in the electrochemical reactions of the battery can move.

[0067] Non-aqueous organic solvents can be carbonate solvents, ester solvents, ether solvents, ketone solvents, alcohol solvents, and aprotic solvents, and can be used alone or in combination of two or more.

[0068] In addition, when using carbonate solvents, a mixture of cyclic carbonates and chain carbonates can be used.

[0069] Depending on the type of lithium-ion 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). For the separator, polyethylene, polypropylene, polyvinylidene fluoride, or multilayer films comprising two or more of these materials may be used.

[0070] The diaphragm may include a porous substrate and a coating on one or both surfaces of the porous substrate, comprising organic materials, inorganic materials, or combinations thereof.

[0071] Organic materials may include polymers such as polyvinylidene fluoride or (meth)acrylic acid polymers.

[0072] 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.

[0073] Organic and inorganic materials can be mixed in a 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, wherein the two coatings are stacked on top of each other.

[0074] Figure 2 This is an example application. Figure 1 An internal view of the electrode assembly of a pouch cell.

[0075] The pouch-type secondary battery 11 includes an electrode assembly 10 and a pouch 11a that houses the electrode assembly 10.

[0076] Electrode assembly 10 and Figure 1 The electrode assemblies shown are identical. The first electrode terminal 10g and the second electrode terminal 10h of the electrode assembly 10 can be electrically connected to the corresponding external first terminal lead 11b and second terminal lead 11c by soldering. Each of the first terminal lead 11b and the second terminal lead 11c may be attached with a terminal film 11d for insulation from the bag 11a.

[0077] The bag 11a can be sealed by bringing the sealing portions 11e at its edges into contact with each other while accommodating the electrode assembly 10. In this case, the seal can be achieved using a connecting piece film 11d between the sealing portions 11e. The sealing portions 11e of the bag 11a can each be made of a hot-melt material that generally has weak adhesion to metals. Therefore, it can be fused to the bag 11a by inserting a thin connecting piece film 11d between the sealing portions 11e.

[0078] Figure 3 This is a cross-sectional view illustrating a cylindrical battery manufactured by an apparatus for manufacturing a secondary battery according to an embodiment of the present disclosure.

[0079] The cylindrical battery 13 includes an electrode assembly 13a, a housing 13p that houses the electrode assembly 13a and an electrolyte therein, a cover assembly 13v that is connected to an opening in the housing 13p to seal the housing 13p, and an insulating plate 13n located within the housing 13p between the electrode assembly 13a and the cover assembly 13v.

[0080] The electrode assembly 13a may include a diaphragm 13d and a first electrode 13c and a second electrode 13e positioned therebetween with the diaphragm 13d in between, and may be wound into an electrode core shape.

[0081] 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 first active material layer that is not positioned on the first substrate, and the first lead tab 13j can be electrically connected to the cover assembly 13v.

[0082] 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 in opposite directions.

[0083] 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.

[0084] 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.

[0085] The housing 13p houses the electrode assembly 13a and, together with the cover assembly 13v, forms the appearance of a secondary battery. The housing 13p may have a generally 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 crimped portion 13f (e.g., a crimping member) may be formed in the body portion 13r, and an inwardly bent crimped portion 13g (e.g., a crimping member) may be formed at the open end of the body portion 13r.

[0086] The rolled edge 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 holds the cover assembly 13v in place 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.

[0087] The cover assembly 13v can be secured to the inside of the crimp portion 13g via a gasket 13h to seal the housing 13p. The cover assembly 13v may include, but is not limited to, an upper cover 13w, a safety vent 13s, a lower cover 13t, an insulating member, and a sub-plate 13u, and may be modified in various ways.

[0088] 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.

[0089] The safety vent 13s may be located below the top cover 13w. The safety vent 13s may include a downwardly projecting protrusion that is connected to the sub-plate 13u, and at least one recess may be formed in the safety vent 13s around the protrusion.

[0090] When 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, while the safety vent 13s is cut (e.g., cracked or torn) along the notch. The cut safety vent 13s prevents the secondary battery from exploding by allowing gas to escape to the outside.

[0091] The lower cover 13t may be located below the safety vent 13s. The lower cover 13t may have a first opening for exposing the protrusion of the safety vent 13s and a second opening for gas venting. 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.

[0092] 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. Therefore, 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.

[0093] The insulating plate 13n can be positioned below the rolled edge 13f to contact the electrode assembly 13a. The insulating plate 13n may have a lead-out opening through which a first lead-out tab 13j extends. The cover assembly 13v, electrically connected to the first electrode 13c via the first lead-out tab 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. Simultaneously, another insulating plate 13m may be included for insulation between the electrode assembly 13a and the bottom portion 13q of the housing 13p.

[0094] Figure 4 This is a perspective view illustrating the appearance of a prismatic battery that can be manufactured by an apparatus for manufacturing a secondary battery according to an embodiment of the present disclosure.

[0095] The housing 15a forms the overall appearance of the prismatic battery 15 and can be formed of a conductive metal such as aluminum, aluminum alloy, or nickel-plated steel. Furthermore, the housing 15a provides space for housing the electrode assembly therein.

[0096] The cover assembly 15b may include a cover plate 15c that covers the opening of the housing 15a. In some examples, the housing 15a and the cover plate 15c may be made of a conductive material. Here, 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.

[0097] An electrolyte inlet 15f can be formed in a cover plate 15c, a gas vent 15g can be opened, and a venting device, i.e., a gas venting device 15h, can be connected to the gas vent 15g. The gas venting device 15h is opened by gas generated inside the battery and performs a degassing function.

[0098] Figure 5 It is along Figure 4 The cross-sectional view of line AA in the diagram.

[0099] 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. The shape of the electrode assembly 15r is not limited in this disclosure.

[0100] Furthermore, the electrode assembly 15r can be a Z-stacked electrode assembly in which a positive electrode plate and a negative electrode plate are inserted into both sides of a diaphragm, and the diaphragm is then bent into a Z-stacked structure. Additionally, one or more 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. The first electrode plate of the electrode assembly 15r can be used as a negative electrode, and the second electrode plate can be used as a positive electrode. Of course, the reverse is also possible.

[0101] The first electrode plate can be formed by coating a first electrode active material such as graphite or carbon onto 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 15p (e.g., a first uncoated portion) as a region where the first electrode active material is not coated. The first electrode tab 15p can serve 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 tab 15p is formed by pre-cutting it to protrude toward one side of the electrode assembly 15r, or the first electrode tab 15p protrudes toward one side of the electrode assembly 15r more than (e.g., farther or beyond) the diaphragm without being separately cut.

[0102] The second electrode plate can be formed by coating a second electrode active material, such as a transition metal oxide, onto 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 15q (e.g., a second uncoated portion) as a region where the second electrode active material is not coated. The second electrode tab 15q can serve 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 tab 15q can be formed by pre-cutting it to protrude toward the other side (e.g., the opposite side) of the electrode assembly 15r, or the second electrode tab 15q can protrude toward the other side of the electrode assembly 15r more than (e.g., farther or beyond) the diaphragm without being separately cut.

[0103] exist Figure 5 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 be located together on the right or left side of the electrode assembly 15r.

[0104] Here, for ease of explanation, the left and right sides of electrode assembly 15r are based on Figure 5 The battery is shown in the diagram. "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" of the electrode assembly 15r, as used herein, may vary when the battery is rotated left-right or up-down.

[0105] 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, for example, of a polyethylene membrane, a polypropylene membrane, or a polyethylene-polypropylene membrane.

[0106] In some embodiments, the electrode assembly 15r is housed together with the electrolyte in a housing 15a.

[0107] 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.

[0108] like Figure 5 As shown, 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.

[0109] Figure 6 This is a view illustrating the basic configuration of an apparatus for manufacturing secondary batteries according to an embodiment of the present disclosure, and Figure 7 This is an example Figure 6 The side view shown depicts the upper cutter moving downwards within the cutting unit. Additionally, Figure 8 It is used to describe Figure 7 A cross-sectional view of the internal structure of the cutting unit.

[0110] As shown, the apparatus 20 for manufacturing secondary batteries according to this embodiment may include a conveying unit, a winding unit 23, a winding unit driver 25, a control unit 27, and a cutting unit 30.

[0111] The conveying unit can move the electrode plate 17, which is the cutting target, along a predetermined conveying path. The conveying unit may include multiple conveying rollers 21. Some of the conveying rollers are driven rollers, while the remaining rollers are not driven and can only be used to tightly support the conveying rollers.

[0112] The electrode plate 17 has a predetermined width and is a stack formed from a substrate and a mixture. The electrode plate 17 can be continuously conveyed, cut, and wound around the winding unit 23 in a cut state along a conveying path provided by the conveying unit. The electrode plate 17 can be a negative electrode plate or a positive electrode plate.

[0113] The winding unit 23 can be rotated by power received from the winding unit driver 25 to wind the electrode plate 17. The electrode plate 17 wound around the winding unit 23 can be pulled out by an operator and moved to a subsequent process. The winding unit 23 may include a winding tower for winding the electrode plate 17.

[0114] The winding unit driver 25 can be controlled by the control unit 27. The winding unit driver 25 can be operated by the control signals of the control unit 27 to make the winding unit 23 rotate or not rotate.

[0115] The control unit 27 can control the on / off state and rotation speed of the winding unit driver 25. In addition, the control unit 27 can send control signals to the upper cutter drive unit 32 so that the upper cutter drive unit 32 moves the upper cutter 33 downward to cut the electrode plate 17 through the cross motion of the upper cutter 33 and the lower cutter 43.

[0116] The cutting unit 30 can cut the electrode plate 17 that has been conveyed to a predetermined length unit. Since the core-type electrode assembly is formed by winding the electrode plate 17, the cutting length of the electrode plate 17 can vary depending on the diameter of the core being manufactured. The electrode plate 17 cut by the cutting unit 30 can be wound around the winding unit 23 and then led out to the outside.

[0117] The cutting unit 30 may include an upper cutter 33, a fixed body 31, a lower cutter 43, and an elastic support.

[0118] The upper cutter 33 is an element mounted to move upward and downward along the conveying path of the electrode plate 17. A vertically extending lifting rod 35 can be fixed to the lower part of the upper cutter 33. The lifting rod 35 is a vertically extending shaft, such as... Figure 8 As shown in the diagram, the lifting rod 35 can pass through the guide hole 31a of the peeler 41 and the fixing body 31, and then its lower end portion can extend downward from the fixing body 31.

[0119] Furthermore, the stop 37 can be fixed to the lifting rod 35. The stop 37 can be engaged on the lower surface of the fixed body 31 to limit the maximum rising height of the upper cutter 33. The lifting rod 35 can repeatedly move up and down by power transmitted from the upper cutter drive unit 32. As the lifting rod 35 moves downward, the upper cutter 33 can cut the electrode plate 17 by performing a cross motion with the lower cutter 43. Figure 7 This illustrates the state where the upper cutter 33 moves as downwards as possible.

[0120] The fixing body 31 can be fixed below the conveying path of the electrode plate 17 to support the lifting rod 35 for upward and downward movement. The fixing body 31 can be fixed to the support structure 29. The support structure 29 is a structure included in the device 20 for manufacturing secondary batteries and can support the fixing body 31. The cutting unit 30 is fixed to one side of the support structure 29. The structure of the fixing body 31 can be implemented in any of a variety of ways, as long as it can support the lifting rod 35 for upward and downward movement and can have Figure 9 or Figure 10 The shape shown is acceptable.

[0121] The peeler 41 and the support spring 39 can be mounted above the fixing body 31. The peeler 41 is a component that elastically supports the lower surface of the electrode plate 17 when cutting the electrode plate 17. In addition, the support spring 39 can elastically support the peeler 41. The support spring 39 can elastically support the peeler 41 while being supported on the fixing body 31.

[0122] The lower cutter 43 can be tightly supported on the side surface of the fixed body 31 and can cut the electrode plate 17 through cross-movement with the upper cutter 33. The lower cutter 43 can be kept connected to the fixed body 31 by an elastic support member. The elastic support member elastically supports the lower cutter 43 toward the fixed body 31 to maintain the lower cutter 43 in a fixed state relative to the fixed body 31.

[0123] The elastic support may include a horizontally extending shaft 45, a compression spring 46, and a spring support.

[0124] A horizontally extending shaft 45, for example, one end portion thereof, can be coupled to a fixed body 31 after passing through a lower cutter 43. The horizontally extending shaft 45 can extend horizontally. The horizontally extending shaft 45 can remain horizontal while being coupled to the fixed body 31. A shaft channel 43c through which the horizontally extending shaft 45 passes is formed in the lower cutter 43.

[0125] A first threaded portion 45a and a second threaded portion 45b can be formed on the outer peripheral surface of the horizontally extending shaft 45. The first threaded portion 45a can be threadedly connected to a connecting hole 31c formed in the fixing body 31. The connecting hole 31c is an internally threaded hole formed in the side surface of the fixing body 31. The first threaded portion 45a can be connected to the connecting hole 31c to maintain the connection between the horizontally extending shaft 45 and the fixing body 31. The second threaded portion 45b is the portion that connects to a pressure control nut 49, which serves as a spring support. The spring support will be described here.

[0126] The pressing spring 46 is a compression helical spring and extends around a horizontally extending shaft 45. The pressing spring 46 can be compressed by the pressing force transmitted from the pressing force control nut 49. The elastic force of the compressed pressing spring 46 can be transmitted to the lower cutter 43 to press the lower cutter 43 toward the fixed body 31.

[0127] The spring support can press the pressing spring 46 toward the lower cutter 43, so that the pressing spring 46 can press the lower cutter 43 toward the fixing body 31. The lower cutter 43, pressed against the fixing body 31, can remain firmly fixed due to the strong contact strength with the fixing body 31. The spring support may include a spring cover 47 and a pressing pressure control nut 49.

[0128] The spring cover 47 is a plate-like member through which a horizontally extending shaft 45 passes. The spring cover 47 may be located on the opposite side of the lower cutter 43, with a pressing spring 46 positioned between the spring cover 47 and the lower cutter 43.

[0129] Furthermore, the pressure control nut 49 can move the spring cover 47 forward toward the pressing spring 46 while being threaded into the second threaded portion 45b. The position of the pressure control nut 49 can be controlled in the longitudinal direction of the horizontal extension shaft 45 by rotating it. Therefore, the gap between the lower cutter 43 and the spring cover 47 can be adjusted by the pressure control nut 49. The narrower the gap between the lower cutter 43 and the spring cover 47, the greater the pressing force of the pressing spring 46, and the stronger the connection between the lower cutter 43 and the fixed body 31.

[0130] Figure 9 This is an example Figure 7 An exploded perspective view of a modified example of the cutting unit 30.

[0131] A positioning guide portion, which guides the position of the lower cutter 43 mounted on the fixed body 31, can be formed between the fixed body 31 and the lower cutter 43. The positioning guide portion can be used to precisely position the lower cutter 43 relative to the fixed body 31.

[0132] The positioning guide may include a positioning groove 43f and an insertion part 31f. The positioning groove 43f may be formed in the surface facing the lower cutter 43 or the fixing body 31, and the insertion part 31f may be formed on the fixing body 31 or the lower cutter 43. The opposing surfaces may be the surfaces of the fixing body 31 and the lower cutter 43 facing each other.

[0133] When the positioning groove 43f is formed in the lower cutter 43, the insertion part 31f can be formed on the fixed body 31. Conversely, when the positioning groove 43f is formed in the fixed body 31, the insertion part 31f can be formed on the lower cutter 43. When the insertion part 31f is assembled into the positioning groove 43f, the lower cutter 43 can be temporarily mounted on the fixed body 31.

[0134] like Figure 9 As shown, the positioning groove 43f can be symmetrically formed on both sides of the shaft channel 43c. The positioning groove 43f can be a wedge-shaped groove that extends vertically and has a closed upper portion. In addition, the insertion portion 31f is a vertically extending protrusion that is inserted from the bottom to the top of the positioning groove 43f.

[0135] Figure 10 This is an example Figure 9 The view shows a modified example of the cutting unit.

[0136] Referring to the accompanying drawings, a horizontally extending positioning groove 43f is formed in the lower cutter 43, and a horizontal insertion portion 31f can be formed on the surface of the fixing body 31 opposite to the lower cutter 43. When the insertion portion 31f is fitted into the positioning groove 43f, the lower cutter 43 can be connected to the fixing body 31.

[0137] Furthermore, multiple shaft channels 43c can be formed in the lower cutter 43. Two shaft channels 43c can be positioned above and below the positioning groove 43f. A horizontally extending shaft 45 can be fitted into each shaft channel 43c.

[0138] Figure 11 This is a cross-sectional view illustrating another example of a cutting unit according to an embodiment of the present disclosure.

[0139] As illustrated, guide grooves 31h can be formed above and below the connecting hole 31c of the fixing body 31. The guide groove 31h is a straight groove extending parallel to the central axis of the horizontal extension shaft 45 and is open to face the spring cover 47.

[0140] Furthermore, the balance arm 47c can be fixed to the spring cover 47. The balance arm 47c is a component that extends horizontally, passes through the through hole 43m of the lower cutter 43, and is inserted into the guide groove 31h while one end is fixed to the spring cover 47. The balance arm 47c can slide within the guide groove 31h while being inserted. The balance arm 47c prevents the spring cover 47 from tilting. That is, the balance arm 47c prevents the spring cover 47 from tilting in a vertical position.

[0141] Figure 12 This is a view illustrating yet another example of a cutting unit according to an embodiment of the present disclosure.

[0142] As illustrated, as an elastic support, it may include a fixing bracket 51, a fixing bolt 53, and a compression spring 46.

[0143] The fixing bracket 51 can be supported by the fixing body 31 on the side opposite to the lower cutter 43. The fixing bracket 51 is a component connected to the fixing body 31 by fixing bolts 53, and can have a facing portion 51a opposite to the lower cutter 43. The facing portion 51a can be parallel to the lower cutter 43. The compression spring 46 can be inserted between the facing portion 51a of the fixing bracket 51 and the lower cutter 43 in a compressed state, and can elastically press the lower cutter 43 toward the fixing body 31 while being supported by the fixing bracket 51.

[0144] Figure 13 This is an example Figure 12 The view shows a modified example of the cutting unit.

[0145] like Figure 13 As shown, multiple spacers 52 can be applied between the fixed body 31 and the fixed bracket 51. The spacers 52 are plate-shaped members with a predetermined thickness and can be applied either as a single piece or in multiple stacked pieces. The spacers 52 are used to adjust the gap between the fixed bracket 51 and the fixed body 31. When spacers 52 are applied, the gap between the opposing portion 51a and the lower cutter 43 increases, and the elasticity of the pressing spring 46 can be reduced. The elasticity of the pressing spring 46 can be controlled by adjusting the number of spacers 52 applied.

[0146] Figure 14 and Figure 15 This is a view illustrating yet another example of a cutting unit according to an embodiment of the present disclosure.

[0147] As illustrated, the cutting unit 30 may further include a spring pusher 55. The spring pusher 55 may be mounted on a fixed bracket 51. The spring pusher 55 can be used to press the pressing spring 46 toward the lower cutter 43. Figure 15 As shown, when the pressing spring 46 is compressed by the spring pusher 55, the elastic force of the pressing spring 46 increases so that the lower cutter 43 can be secured with greater strength.

[0148] The spring actuator 55 may include a threaded shaft 55b, a pusher disc 55c, and a torque input unit 55a. The threaded shaft 55b is a round rod with threads formed on its outer surface and can be threaded into the internal threaded hole 51e of the fixed bracket 51. As the threaded shaft 55b rotates axially, it can move forward toward the lower cutter 43 or backward in the opposite direction.

[0149] The push plate 55c is a disc-shaped component mounted on one end portion of the threaded shaft 55b and can transmit pressing force to the pressing spring 46. The push plate 55c can contact one end of the pressing spring 46 and can provide pressing force to the pressing spring 46. Figure 14 This illustrates the state where the push plate 55c is moved as far back as possible. Conversely, Figure 15 Example: The push plate 55c moves toward the lower cutter 43 to compress the pressing spring 46.

[0150] The torque input unit 55a is, for example, a handle that can apply axial rotational force to the threaded shaft 55b. The operator can rotate the torque input unit 55a to set the pressing spring 46 to have optimal elasticity.

[0151] According to the apparatus for manufacturing secondary batteries and the electrode plate cutting unit for secondary batteries formed as described herein, the lower cutter has good fixing strength and maintains cutting accuracy stably by using a high-strength spring to press the lower cutter in a fixed manner, thereby preventing the deintercalation of active material when cutting the electrode plate and improving the quality of the cut surface.

[0152] While this disclosure has been described herein with reference to embodiments thereof, it is not limited thereto. Those skilled in the art will be able to make various modifications and variations to it within the spirit defined by the claims and their equivalents.

Claims

1. An apparatus for manufacturing secondary batteries, comprising: The conveying unit is configured to convey the electrode plate, which is the cutting target, along the conveying path; A winding unit is configured to receive and wind the cut electrode plate conveyed by the conveying unit; as well as The cutting unit has: an upper cutter, mounted above the conveying path, for moving upward and downward; A fixed body is fixed below the conveying path to provide support strength; The lower cutter, supported by the fixed body, is configured to cut the electrode plate by intersecting motion with the upper cutter; And an elastic support member that elastically supports the lower cutter toward the fixed body to maintain the lower cutter in a fixed state relative to the fixed body.

2. The device according to claim 1, wherein the elastic support comprises: A horizontal extension shaft, one end portion of which passes through the lower cutter to be coupled to the fixed body, and the horizontal extension shaft extends horizontally; Press the spring, around the horizontally extending axis; as well as A spring support member presses the pressing spring toward the lower cutter, so that the pressing spring presses the lower cutter toward the fixed body.

3. The device of claim 2, wherein the threaded portion is formed on the horizontally extending shaft, and The spring support includes: A spring cover, through which the horizontally extending shaft passes; as well as A pressure control nut is attached to the threaded portion to allow the spring cap to move forward toward the pressure spring.

4. The device of claim 1, further comprising a positioning guide formed between the fixed body and the lower cutter, the positioning guide being configured to guide the installation position of the lower cutter relative to the fixed body.

5. The device according to claim 4, wherein the positioning guide comprises: A positioning groove is formed in the surface facing the lower cutter or the fixing body; as well as An insertion portion is formed on the fixed body or the lower cutter and is fitted into the positioning groove.

6. The device of claim 3, wherein a plurality of guide slots are formed in the fixing body, the plurality of guide slots being parallel to the horizontally extending axis and open to face the spring cover, and The spring cover is provided with a balance arm that extends horizontally while being secured to the spring cover and is slidably inserted into the guide slot to prevent the spring cover from tilting.

7. The device according to claim 1, wherein the elastic support comprises: The fixed bracket is supported by the fixed body on the side opposite to the lower cutter; as well as The pressing spring, in a compressed state, is assembled between the fixed bracket and the lower cutter, and while supported by the fixed bracket, it elastically presses the lower cutter toward the fixed body.

8. The device of claim 7, further comprising a spacer provided between the fixing body and the fixing bracket, the spacer being configured to adjust the gap between the fixing body and the fixing bracket.

9. The device according to claim 7, further comprising a spring pusher mounted on the fixed bracket, the spring pusher pressing the pressing spring toward the lower cutter.

10. The device according to claim 9, wherein an internally threaded hole is formed in the fixed bracket, and The spring actuator includes: A threaded shaft, threadedly connected to the internally threaded hole; A push plate, provided on one end portion of the threaded shaft, transmits pressing force to the pressing spring; as well as A torque input unit is configured to apply an axial rotational force to the threaded shaft.

11. A unit for cutting electrode plates, comprising: An upper cutter is mounted above the conveying path of an electrode plate that moves along the conveying path; A fixed body is fixed below the conveying path to provide support strength; The lower cutter, supported by the fixed body, cuts the electrode plate through a cross-movement with the upper cutter; as well as An elastic support member elastically supports the lower cutter toward the fixed body to maintain the lower cutter in a fixed state relative to the fixed body.

12. The electrode plate cutting unit according to claim 11, wherein the elastic support member comprises: A horizontal extension shaft, one end portion of which passes through the lower cutter to be coupled to the fixed body, and the horizontal extension shaft extends horizontally; Press the spring, around the horizontally extending axis; as well as A spring support member presses the pressing spring toward the lower cutter, so that the pressing spring presses the lower cutter toward the fixed body.

13. The electrode plate cutting unit according to claim 12, wherein the threaded portion is formed on the horizontally extending shaft, and The spring support includes: A spring cover, through which the horizontally extending shaft passes; as well as A pressure control nut is attached to the threaded portion to allow the spring cap to move forward toward the pressure spring.

14. The electrode plate cutting unit of claim 11, further comprising a positioning guide formed between the fixing body and the lower cutter, the positioning guide being configured to guide the installation position of the lower cutter relative to the fixing body.

15. The electrode plate cutting unit according to claim 14, wherein the positioning guide comprises: A positioning groove is formed in the surface facing the lower cutter or the fixing body; as well as An insertion portion is formed on the fixed body or the lower cutter and is fitted into the positioning groove.

16. The electrode plate cutting unit of claim 13, wherein a plurality of guide grooves are formed in the fixing body, the plurality of guide grooves being parallel to the horizontal extending axis and open to face the spring cover, and The spring cover is provided with a balance arm that extends horizontally while being secured to the spring cover and is slidably inserted into the guide slot to prevent the spring cover from tilting.

17. The electrode plate cutting unit according to claim 11, wherein the elastic support member comprises: The fixed bracket is supported by the fixed body on the side opposite to the lower cutter; as well as The pressing spring, in a compressed state, is assembled between the fixed bracket and the lower cutter, and while supported by the fixed bracket, it elastically presses the lower cutter toward the fixed body.

18. The electrode plate cutting unit of claim 17, further comprising a spacer provided between the fixing body and the fixing bracket, the spacer being configured to adjust the gap between the fixing body and the fixing bracket.

19. The electrode plate cutting unit according to claim 17, further comprising a spring pusher mounted on the fixed bracket, the spring pusher pressing the pressing spring toward the lower cutter.

20. The electrode plate cutting unit according to claim 19, wherein an internally threaded hole is formed in the fixed bracket, and The spring actuator includes: A threaded shaft, threadedly connected to the internally threaded hole; A push plate, provided on one end portion of the threaded shaft, transmits pressing force to the pressing spring; as well as A torque input unit is configured to apply an axial rotational force to the threaded shaft.

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