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 for manufacturing a secondary battery capable of realizing continuous cutting and preventing a reduction in productivity by supporting a cutting front end after cutting an electrode plate to prevent the electrode plate from falling off from a normal transfer path. An apparatus for manufacturing a secondary battery includes: a transport unit configured to transport an electrode plate along a transport path; a winding unit configured to receive and wind the electrode plate conveyed by the conveying unit; and a cutting unit having a cutting portion that cuts the conveyed electrode plate and a separation prevention portion that supports the leading end portion of the subsequent electrode plate moving toward the winding unit in the conveying direction after the leading end portion of the subsequent electrode plate is cut by the cutting portion, therefore, the subsequent electrode plates are prevented from deviating towards the conveying path of the winding unit.

Description

Technical Field

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

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

[0003] 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. The winding device 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. However, conventional electrode plate cutting devices cut electrode plates, and then the electrode plates may easily deflect downwards due to the tension at the cutting tip.

[0004] The information disclosed in this background section is intended to enhance the understanding of the background of this disclosure, and therefore may contain information that does not constitute related technology (or prior art). Summary of the Invention

[0005] This disclosure aims to provide an apparatus for manufacturing secondary batteries and an electrode plate cutting unit for manufacturing secondary batteries, which can achieve continuous cutting by supporting the cutting front end after cutting the electrode plate to prevent the electrode plate from falling off the normal transport path.

[0006] According to an aspect of this disclosure, an apparatus for manufacturing a secondary battery is provided, comprising: a conveying unit configured to convey electrode plates along a conveying path; a winding unit configured to receive and wind the electrode plates conveyed by the conveying unit; and a cutting unit having a cutting portion and a separation prevention portion, the cutting portion cutting the conveyed electrode plates, and the separation prevention portion supporting the front end portion of a subsequent electrode plate moving toward the winding unit in the conveying direction after the front end portion of a subsequent electrode plate is cut by the cutting portion, so as to prevent the subsequent electrode plate from deviating from the conveying path toward the winding unit.

[0007] According to another aspect of this disclosure, an electrode plate cutting unit is provided, comprising: an upper cutter mounted above a conveying path of an electrode plate being conveyed along a conveying path; a lower cutter mounted below the conveying path to cut the electrode plate; and a separation prevention part supporting the front end portion of the electrode plate cut by the upper cutter and the lower cutter to prevent the electrode plate from drooping downward and deviating from the conveying path.

[0008] The aspects and features of this disclosure are not limited to those described herein, and other aspects and features not specifically mentioned will be clearly understood by those skilled in the art from the following description of this disclosure. Attached Figure Description

[0009] The objects, features, and advantages of this disclosure will become apparent to those skilled in the art from the detailed description of exemplary embodiments thereof with reference to the accompanying drawings, in which:

[0010] 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 an embodiment of the present disclosure.

[0011] Figure 2 It is a graphical application. Figure 1 An internal view of the electrode assembly of a pouch cell;

[0012] Figure 3 This is a cross-sectional view of a cylindrical battery manufactured by an apparatus for manufacturing a secondary battery according to an embodiment of the present disclosure.

[0013] Figure 4 This is a perspective view of the exterior of a prismatic battery manufactured by an apparatus for manufacturing a secondary battery according to an embodiment of the present disclosure.

[0014] Figure 5 It is along Figure 4 A cross-sectional view of line A-A' in the diagram.

[0015] Figures 6 to 10 This is a view used to describe the configuration and operation method of an apparatus for manufacturing secondary batteries using a cutting unit according to an embodiment of this disclosure;

[0016] Figures 11 to 13 This is a view illustrating another example of an apparatus for manufacturing a secondary battery according to an embodiment of the present disclosure;

[0017] Figures 14 to 16 This is a view illustrating yet another example of an apparatus for manufacturing a secondary battery according to an embodiment of the present disclosure;

[0018] Figures 17 to 19 This is a view illustrating yet another example of an apparatus for manufacturing a secondary battery according to an embodiment of the present disclosure;

[0019] Figures 20 to 22 This is a view illustrating yet another example of an apparatus for manufacturing a secondary battery according to an embodiment of the present disclosure;

[0020] Figure 23This is a cross-sectional view illustrating a modified example of a moving guide included in an apparatus for manufacturing secondary batteries according to an embodiment of the present disclosure; and

[0021] Figure 24 This is a cross-sectional view illustrating a modified example of a fixing guide included in an apparatus for manufacturing a secondary battery according to an embodiment of the present disclosure. Detailed Implementation

[0022] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings. The terms or words used in this specification and claims are not limited to their general or dictionary meanings, but should be interpreted as having meanings and concepts consistent with the technical spirit of this disclosure, based on the principle that the inventor can be his / her own lexicographer to appropriately define the concepts of the terms in a manner best describing his / her invention.

[0023] The embodiments described in this specification and the configurations shown in the accompanying drawings are only some embodiments of this disclosure and do not represent all aspects, features, and embodiments of this disclosure. Accordingly, it should be understood that various equivalents and modifications may exist to replace or modify one or more embodiments or features described herein at the time of filing of this application.

[0024] It should be understood that if an element or layer is described as being "on" another element or layer, "connected to," or "linked to" another element or layer, it can be directly on, directly connected to, or directly linked to the other element or layer, or one or more intermediary elements or layers may exist. When an element or layer is described as being "directly on" another element or layer, "directly connected to," or "directly linked to" another element or layer, then no intermediary element or layer exists. For example, if a first element is described as being "linked" or "connected" to a second element, then the first element can be directly linked or directly connected to the second element, or the first element can be indirectly linked or indirectly connected to the second element via one or more intermediary elements.

[0025] In the figures, the dimensions of various elements, layers, etc., may be enlarged for clarity of explanation. The same reference numerals label the same elements. As used herein, the term “and / or” includes any and all combinations of one or more of the associated enumerated items. Furthermore, the use of “may” refers to “one or more embodiments of this disclosure” when describing embodiments of the present disclosure. If expressions such as “at least one of…” and “any one of…” precede / follow a list of elements, they modify the entire list of elements and not individual elements within the list. When a list of elements A, B, and C is labeled with 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,” 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” and its variations may be considered synonymous with the term “utilize” and its variations, respectively. As used herein, the terms “substantially,” “about,” and similar terms are used as approximate terms and not as terms of degree, and are intended to explain the inherent variations in measured or calculated values ​​that will be recognized by those skilled in the art.

[0026] It should be understood that although the terms first, second, third, etc., may be used herein to describe various elements, components, regions, layers, and / or portions, these elements, components, regions, layers, and / or portions should not be limited by these terms. These terms are used to distinguish one element, component, region, layer, or portion from another element, component, region, layer, or portion. Therefore, without departing from the teachings of the exemplary embodiments, the first element, first component, first region, first layer, or first portion discussed herein may be referred to as a second element, second component, second region, second layer, or second portion.

[0027] For ease of description, spatial relative terms such as “below,” “under,” “down,” “above,” and “above” are used herein to describe the relationship between one element or feature and another illustrated in the figures. It should be understood that, in addition to the orientation depicted in the figures, the spatial relative terms are intended to also encompass different orientations of the device during use or operation. For example, if the device in the figures is flipped, an element described as “below” or “under” other elements or features will then be oriented “above” or “above” other elements or features. Therefore, the term “below” can encompass both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or oriented in other directions), and the spatial relative descriptors used herein should be interpreted accordingly.

[0028] 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, unless the context clearly indicates otherwise, the singular form "a" and its variations are intended to also include the plural form. It should be further understood that if the term "comprising" and its variations are used in this specification, the term specifies the presence of the described features, numbers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, numbers, steps, operations, elements, components, and / or groups thereof.

[0029] Furthermore, any numerical range disclosed and / or referenced herein is intended to include all subranges with the same numerical precision contained within the referenced range. For example, the range “1.0 to 10.0” is intended to include all subranges between (and inclusive of) the stated minimum value of 1.0 and the stated 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 set forth herein is intended to include all lower numerical limits contained therein, and all minimum numerical limits set forth in this specification are intended to include all higher numerical limits contained therein. Accordingly, the applicant reserves the right to amend this specification (including the claims) to expressly set forth any subranges contained within the range expressly set forth herein. All such ranges are intended to be inherently described in this specification such that any amendment to expressly set forth any such subrange will comply with the requirements of the patent rules.

[0030] 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 5% or less. Additionally, if a parameter is said to be uniform in a given region, this can mean that it is uniform in terms of average value.

[0031] Throughout the instruction manual, unless otherwise stated, each element may be singular or plural.

[0032] Placing any element "above (or below)" or "above (below)" another element can mean that the arbitrary element can contact the upper (or lower) surface of the element, and that the other element can be located between the element and any element located above (or below) the element.

[0033] Additionally, it should be understood that if a component is referred to as a “link,” “connect,” or “attached” to another component, then these components can be directly “connected,” “linked,” or “attached” to each other, or can be “between” one component and another component.

[0034] Throughout the specification, unless otherwise stated, if "A and / or B" is stated, it means A, B, or A and B. That is, "and / or" includes any or all combinations of the listed items. Unless otherwise stated, when "C to D" is stated, it means C and below D.

[0035] The terminology used herein is for the purpose of describing embodiments of this disclosure and is not intended to limit this disclosure.

[0036] Figure 1 This is a schematic diagram illustrating an electrode assembly of a secondary battery that can be manufactured using an apparatus for manufacturing a secondary battery according to an embodiment of the present disclosure.

[0037] The electrode assembly 10 can be formed by winding or stacking the first electrode plate 10a, the diaphragm 10c, and the second electrode plate 10e, each of which is formed as a plate or a film.

[0038] In 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. Alternatively, the electrode assembly 10 may be a Z-stacked electrode assembly, wherein a positive electrode plate and a negative electrode plate are inserted into opposite sides of a diaphragm, and the diaphragm is then bent (or folded) into a Z-stack.

[0039] Alternatively, one or more 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 the housing, and the number of electrode assemblies in the housing is not limited in this disclosure. The first electrode plate 10a of the electrode assembly 10 can serve as a negative electrode, and the second electrode plate 10e can serve as a positive electrode. Of course, the reverse is also possible.

[0040] 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 10g (e.g., a first uncoated portion) as a region where the first electrode active material is not applied. The first electrode tab 10g can be connected to an external first terminal. In some embodiments, when manufacturing the first electrode plate 10g, the first electrode tab 10g can be formed by pre-cutting to protrude to one side of the electrode assembly 10 (or protruding from one side of the electrode assembly 10), or the first electrode tab 10g can protrude more (e.g., further or beyond the diaphragm 10c) to one side of the electrode assembly 10 without separate cutting.

[0041] 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 10h (e.g., a second uncoated portion) as a region 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 pre-cutting it to protrude to the other side (e.g., the opposite side) of the electrode assembly 10, or the second electrode plate 10e can protrude further (e.g., further away or beyond the diaphragm 10c) to the other side of the electrode assembly without separate cutting.

[0042] 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 the first electrode plate 10a and the second electrode plate 10e. The diaphragm 10c can be made of, for example, a polyethylene membrane, a polypropylene membrane, or a polyethylene-polypropylene membrane.

[0043] 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 ).

[0044] A description of the materials that can be used for the electrode plates in the electrode assembly described in this paper is given.

[0045] As the positive electrode active material, compounds capable of reversibly inserting / deintercalating lithium (e.g., lithiation 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.

[0046] The composite oxide can be a lithium transition metal composite oxide, and examples of it can include lithium nickel-based oxides, lithium cobalt-based oxides, lithium manganese-based oxides, lithium iron phosphate-based compounds, cobalt-free nickel manganese-based oxides, or combinations thereof.

[0047] As an example, a compound represented by any of the following 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 Xb 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, O≤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); Li a FePO4 (0.90≤a≤1.8).

[0048] In the formulas in this paper: 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 L1 is Mn, Al or a combination thereof.

[0049] 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.

[0050] Based on 100 wt% of the positive electrode active material layer, the content of the positive electrode active material is 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 each in the range of about 0.5 wt% to about 5 wt%.

[0051] The substrate may be aluminum (Al) foil, but is not limited thereto.

[0052] 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 undoping lithium, or a transition metal oxide.

[0053] 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, sintered coke, etc.

[0054] The Si-based negative electrode active material or the Sn-based negative electrode active material may be used as the material capable of doping and undoping lithium. The Si-based negative electrode active material may be silicon, a silicon-carbon composite, SiOx (0 < x ≤ 2, for example, SiO2), a Si-based alloy, or a combination thereof.

[0055] 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 an amorphous carbon coating coated on the surface of the silicon particles.

[0056] 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.

[0057] [[ID=?]]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.

[0058] For example, the negative electrode active material layer may include about 90 wt% to about 99 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.

[0059] It seems there is a duplicate ID "24" in the original text which might be a mistake. I've translated it as best as possible while keeping all the tags and text as per the instructions.Non-aqueous binders, aqueous binders, dry binders, or combinations thereof can be used as binders. When an aqueous binder is used as a negative electrode binder, it may further include cellulose compounds capable of imparting viscosity.

[0060] As 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.

[0061] Electrolytes used in lithium secondary batteries may include non-aqueous organic solvents and lithium salts.

[0062] Non-aqueous organic solvents act as a medium through which ions participating in the electrochemical reactions of the battery can move.

[0063] Non-aqueous organic solvents can be carbonate-based solvents, ester-based solvents, ether-based solvents, ketone-based solvents, alcohol-based solvents, or aprotic solvents, and can be used alone or in combination of two or more.

[0064] In addition, when using carbonate-based solvents, a mixture of cyclic carbonates and chain carbonates can be used.

[0065] 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). Polyethylene, polypropylene, polyvinylidene fluoride, or multilayer films comprising two or more layers thereof can be used as the separator.

[0066] 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.

[0067] Organic materials may include polyvinylidene fluoride polymers or (meth)acrylic acid polymers.

[0068] 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.

[0069] Organic and inorganic materials can be mixed in a coating, or they 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.

[0070] Figure 2 It is a graphical application. Figure 1 An internal view of the electrode assembly of a pouch cell.

[0071] The pouch-type secondary battery includes an electrode assembly 10 and a pouch 11a that houses the electrode assembly 10.

[0072] Electrode assembly 10 and Figure 1 The same as shown in the diagram. 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.

[0073] The bag 11a can be sealed by bringing its sealing portions 11e at its edges into contact with each other when housing the electrode assembly 10. In this case, the seal can be achieved by placing a thin connecting 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, by placing the thin connecting film 11d between the sealing portions 11e, the thin connecting film 11d can be melted onto the bag 11a.

[0074] Figure 3 This is a cross-sectional view of a cylindrical battery manufactured by an apparatus for manufacturing a secondary battery according to an embodiment of the present disclosure.

[0075] The cylindrical battery 13 includes: an electrode assembly 13a; a housing 13p containing electrolyte in the electrode assembly 13a and the housing 13p; a cover assembly 13v connected to an opening in the housing 13p to seal the housing 13p; and an insulating plate 13n located between the electrode assembly 13a and the cover assembly 13v within the housing.

[0076] The electrode assembly 13a may include a diaphragm 13d, a first electrode 13c, and a second electrode 13e (the diaphragm is located between the first electrode 13c and the second electrode 13c) and may be wound into an electrode core shape.

[0077] 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 substrate that does not have the first active material layer, and the first lead tab 13j can be electrically connected to the cover assembly 13v.

[0078] The second electrode 13e includes a second substrate and a second active material layer on the second substrate. A second lead tab 13k can extend outward from a second uncoated portion of the second substrate without the second active material layer, and the second lead tab 13k can be electrically connected to the housing 10. The first lead tab 13j and the second lead tab 13k can extend in opposite directions.

[0079] The first electrode 13c can serve 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 serve 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.

[0080] The diaphragm 13d prevents short circuits between the first electrode 13c and the second electrode 13e, while allowing lithium ions to move between the first electrode 13c and the second electrode 13e. The diaphragm 13d can be made of, for example, a polyethylene membrane, a polypropylene membrane, or a polyethylene-polypropylene membrane.

[0081] 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 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 (e.g., a rolled edge) 13f may be formed in the body portion 13r, and an inwardly bent crimped portion (e.g., a crimp edge) 13g may be formed at the open end of the body portion 13r.

[0082] The crimping portion 13f can reduce or prevent movement of the electrode assembly 30 inside the housing 13p, and facilitates the placement of the gasket 13h and the cover assembly 13v. The crimping portion 13g can securely fix the cover assembly 13v by pressing the edge of the cover assembly 13v against the gasket 13h. The housing 13p can be formed, for example, from nickel-plated steel.

[0083] 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.

[0084] The top cover 13w may be located at the uppermost part of the cover assembly 13v. The top cover 13w may include an upwardly protruding terminal portion that is connected to an external circuit, and an outlet for venting gas may be arranged around the terminal portion.

[0085] 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 around the protrusion in the safety vent 13s.

[0086] When gas is generated due to overcharging or abnormal operation of the secondary battery, the protrusion deforms upward under pressure and separates from the sub-plate 13u, while the safety vent 13s is cut off along the notch (e.g., burst or tear). The cut safety vent 13s prevents the secondary battery from exploding by allowing gas to escape to the outside.

[0087] 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 venting gas. 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.

[0088] The sub-plate 13u can be located below the lower cover 13t. The sub-plate 13u can be fixed to the lower surface of the lower cover 13t to block the first opening of the lower cover 13t, and the protrusion of the safety vent 13s can be fixed to the sub-plate 13u. The first lead connector 13j pulled out from the electrode assembly 13a can be fixed to the sub-plate 13u.

[0089] The insulating plate 13n can be positioned below the coiled portion 13n to contact the electrode assembly 13a. The insulating plate 13n may have a tab opening through which the first lead tab 13j is pulled out. The cover assembly 13v, electrically connected to the first electrode 13c via the first lead tab 13j, can face the electrode assembly 13a with the insulating plate 13n positioned between the electrode assembly 13a and the cover assembly 13v, and can be kept insulated (e.g., electrically insulated) from the electrode assembly 13a by the insulating plate 13n. Additionally, another insulating plate 13m may be included for insulation between the electrode assembly 13a and the bottom portion 13q of the housing 13p.

[0090] Figure 4 This is a perspective view of the exterior of a prismatic battery that can be manufactured by an apparatus for manufacturing a secondary battery according to an embodiment of the present disclosure.

[0091] 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. Additionally, the housing 15a provides space for housing the electrode assembly therein.

[0092] 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 15b 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 and may be mounted to protrude outward through the cover plate 15c.

[0093] 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 can be opened by gas generated inside the battery and performs a degassing function.

[0094] Figure 5 It is along Figure 4 A cross-sectional view of line A-A' in the diagram.

[0095] Electrode assembly 13a can be formed by winding or stacking the first electrode plate, the diaphragm, and the second electrode plate. When electrode assembly 15r is wound, the winding axis can be parallel to the longitudinal direction of the housing. In some other embodiments, electrode assembly 15r can be stacked instead of wound. In this disclosure, the shape of electrode assembly 15r is not limited.

[0096] Alternatively, 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 a diaphragm, and then the diaphragm is bent into a Z-stack. Furthermore, one or more electrode assemblies 15r can be stacked such that the long sides of the electrode assemblies are adjacent to each other and housed within a housing, and the number of electrode assemblies in the housing is not limited in this disclosure. The first electrode plate of the electrode assembly 15r can serve as a negative electrode, and the second electrode plate can serve as a positive electrode. Of course, the reverse is also possible.

[0097] 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 11 may include a first electrode tab 43 (e.g., a first uncoated portion), and the first electrode tab 14 is a region where the first electrode active material is not applied. 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, during the manufacture of the first electrode plate, the first electrode tab 15p is formed by pre-cutting to protrude to one side of the electrode assembly, or the first electrode tab may protrude further (e.g., farther or beyond the diaphragm) to one side of the electrode assembly without separate cutting.

[0098] 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 15q (e.g., a second uncoated portion), which is a region where the second electrode active material is not applied. 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 to the other side (e.g., the opposite side) of the electrode assembly, or the second electrode plate can protrude further (e.g., further or beyond the diaphragm) to the other side of the electrode assembly without separate cutting.

[0099] exist Figure 5 In the diagram, the first electrode contact 15p and the second electrode contact 15q are shown located on the right and left sides of the electrode assembly 15r, respectively. However, in some other embodiments, the first electrode contact 15p and the second electrode contact 15q may be located together on the right or left side of the electrode assembly 15r.

[0100] Here, for ease of explanation, the left and right sides of electrode assembly 15r are based on Figure 5 The battery is illustrated in the diagram. The left side refers to the side of the vertical surface of the electrode assembly 15r that engages with the second current collector 15n, and the 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 herein may change as the battery rotates left-right or up-down.

[0101] 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, or polyethylene-polypropylene membranes.

[0102] In some embodiments, the electrode assembly 15r is housed together with the electrolyte in a housing 15a.

[0103] 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.

[0104] like Figure 5As illustrated, 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 tightened to the first terminal 15d and the second terminal 15e. 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.

[0105] Figures 6 to 10 This is a view used to describe the configuration and operation method of the apparatus 20 for manufacturing secondary batteries using the cutting unit 30 according to an embodiment of this disclosure;

[0106] As illustrated, the apparatus 20 for manufacturing secondary batteries according to this embodiment may include a conveying unit, a winding unit, and a cutting unit having a separation prevention part.

[0107] The conveying unit can convey the electrode plate 21, which is the cutting target, along a predetermined conveying path, and includes multiple conveying rollers 23. Some of the conveying rollers 23 are driven rollers, while the remaining rollers are not driven and can only be used to firmly support the electrode plate 21. The electrode plate 21 can have a predetermined width and can be a stack formed of a substrate and a mixture. The electrode plate 21 can be continuously conveyed along the conveying path provided by the conveying unit and wound around the winding unit 24.

[0108] The winding unit 24 can be rotated by power received from the winding unit driver 26 to receive and wind the electrode plate 21. The electrode plate 21 wound around the winding unit 24 can be pulled out by an operator and moved to a subsequent process. The winding unit 24 may include a winding turret for winding the electrode plate 21.

[0109] The winding unit driver 26 can be controlled by the control unit 28. The winding unit driver 26 can be operated by control signals from the control unit 28 to rotate or not rotate the winding unit 24. The control unit 28 can control the opening / closing and rotation speed of the winding unit driver 26. Additionally, the control unit 28 can transmit control signals to the cutting unit 30. That is, the control unit 28 can be connected to the upper cutter drive module 43 and the first guide drive unit 55 (which will be described herein) to transmit control signals.

[0110] Simultaneously, the cutting unit 30 can cut the conveyed electrode plate 21 into predetermined length units. Since the core-type electrode assembly is formed by winding the electrode plate 21, the cutting length of the electrode plate 21 can vary according to the diameter of the manufactured core.

[0111] The electrode plate 21 cut by the cutting unit 30 can be wound around the winding unit 24 and then pulled out to the outside. In addition, the electrode plate 21 to be re-wound around the winding unit 24 (i.e., the "subsequent electrode plate") among the cut electrode plates 21 is re-wound while being fixed on the empty winding unit 24.

[0112] In this specification, the subsequent electrode plate 21b (see...) Figure 9 The electrode plate 21a is the electrode plate following the "front electrode plate" that is wound around the winding unit 24, based on the point in time when the cut portion of the electrode plate 21, which is continuously conveyed while being wound around the winding unit 24, is cut. Additionally, the front electrode plate 21a (see...) Figure 9 A core is formed by winding around the winding unit 24. Subsequently, subsequent electrode plates begin to be rewound around the winding unit.

[0113] Meanwhile, the cutting unit may include a cutting section and a separation prevention section. The cutting section may include an upper cutter mounted above the conveying path of the electrode plate, and a lower cutter mounted below the conveying path to cut the electrode plate by intersecting with the upper cutter. In addition, the cutting section may include an upper cutting section 40 and a lower cutting section 50.

[0114] The upper cutting section 40 may include an upper cutter 41 and an upper cutter drive module 43. The upper cutter 41 is a blade with a cutting edge 41a formed on one side of its lower end portion, and can be mounted to move upward and downward along the transport path of the electrode plate 21. The upward and downward movement of the upper cutter 41 can be implemented by the upper cutter drive module 43. In another embodiment, a peeler may be additionally applied to the upper cutting section 40 to elastically support the electrode plate 21.

[0115] Additionally, the lower cutting section 50 may include a lower cutter 51. The lower cutter 51 may be vertically disposed below the upper cutter 41, with the electrode plate 21 positioned between the upper cutter 41 and the lower cutter 51. The lower cutter 51 may have a cutting blade 51a at its upper end. The lower cutter 51 can cut the electrode plate 21 by intersecting with the upper cutter 41. In another embodiment, a peeler that elastically supports the electrode plate upward may be additionally mounted on the side of the lower cutter 51.

[0116] The separation prevention unit can support the front end portion of the subsequent electrode plate 21b in the conveying direction to prevent the front end portion from sagging downwards due to gravity. That is, after the front end portion of the subsequent electrode plate is cut by the cutting unit, the separation prevention unit supports the front end portion of the subsequent electrode plate in the conveying direction toward the winding unit to prevent the electrode plate from deviating from the conveying path toward the winding unit.

[0117] The separation prevention unit may include a lower moving guide 53 and a first guide drive 55. The lower moving guide 53 can support the lower cutter 51 while being mounted on the side of the lower cutter 51, and can move upward and downward (e.g., vertically). The lower cutter 51 can be supported by the lower moving guide 53 to remain firmly fixed without wobbling when cutting the electrode plate 21. The first guide drive 55 can be configured to move the lower moving guide 53 upward and downward.

[0118] Additionally, the lower moving guide 53 waits below the conveying path of the electrode plate 21, and when the electrode plate 21 is cut, the lower moving guide 53 can move upward to... Figure 10 The diagram shows the front end of the subsequent electrode plate 21b supported in the conveying direction. The reason for supporting the front end is to prevent it from falling downwards due to gravity. That is, to prevent the subsequent electrode plate 21b from deviating from the normal conveying path. The shape of the downward-moving guide 53, which performs this function, can be changed through various embodiments.

[0119] After the cutting unit (e.g., the cutting section of the cutting unit) cuts the electrode plate 21, when the upper cutter moves upward, the first guide drive unit 55 can simultaneously move the lower moving guide 53 upward so that the lower moving guide provides an upward support force for the front end portion of the subsequent electrode plate 21b.

[0120] The operation of the apparatus 20 for manufacturing secondary batteries, which has the configuration described herein, can be performed as follows.

[0121] First, such as Figure 6 As illustrated, electrode plate 21 is conveyed and wound around winding unit 24 in the direction of arrow a. In this case, upper cutter 41 can move upward, and lower movement guide 53 can move downward. As described herein, when electrode plate 21 is conveyed and then the point to be cut is located between upper and lower cutters, upper cutter 41 can move downward via upper cutter drive module 43 and cut electrode plate 21, as... Figure 7 and Figure 8 As shown in the figure, electrode plate 21 can be cut and divided into front electrode plate 21a and rear electrode plate 21b.

[0122] like Figure 9 As illustrated in the figure, after the process described herein is completed, by continuously applying tension to the electrode plate 21, the front electrode plate 21a can be wound around the winding unit 24, and the subsequent electrode plate 21b can be placed above the lower cutter 51.

[0123] In addition, such as Figure 10As illustrated, after electrode plate 21a is cut, upper cutter 41 and lower moving guide 53 can immediately move upward. Lower moving guide 53 can prevent subsequent electrode plate 21b from sagging or rolling downward as it moves along the conveying direction.

[0124] Figures 11 to 13 This is a view illustrating another example of an apparatus 20 for manufacturing a secondary battery according to an embodiment of the present disclosure;

[0125] In the following text, the same reference numerals as those in the accompanying drawings indicate the same components having the same function, and their repeated descriptions will be omitted.

[0126] As illustrated, the cutting unit 30 may include an upper moving guide 57 and a second guide drive 58. The upper moving guide 57 and the second guide drive 58 can be used as separation prevention parts herein. The upper moving guide 57 may be located above the transport path of the electrode plate.

[0127] The upper moving guide 57 can be mounted to move upward and downward on the side of the upper cutter 41. The upper moving guide 57 can be moved upward and downward by the second guide drive unit 58. The second guide drive unit 58 can be operated after receiving a control signal from the control unit 28.

[0128] Figures 11 to 13 The operation of the illustrated apparatus 20 for manufacturing secondary batteries can be performed as follows. First, as... Figure 11 As illustrated, electrode plate 21 is conveyed along a conveyor path. Simultaneously with the conveying of the electrode plate, when the point of cutting the electrode plate is located between the upper cutter 41 and the lower cutter 51, the upper cutter 41 moves downwards and performs the cut at the target point. After cutting electrode plate 21, the upper cutter 41 can immediately return to its original position by moving upwards.

[0129] Additionally, when the upper cutter 41 moves upward, the upper moving guide 57 can be moved downward by the second guide drive 58, and as... Figure 13 As illustrated, the upper moving guide 57 can support the front end portion of the subsequent electrode plate 21b, so that the upper moving guide 57 provides an upward supporting force to the front end portion of the subsequent electrode plate 21b. That is, it can prevent the front end portion of the subsequent electrode plate 21b from sagging or rolling downward.

[0130] Figures 14 to 16 This is a view illustrating yet another example of an apparatus for manufacturing a secondary battery according to an embodiment of the present disclosure.

[0131] like Figures 14 to 16 As shown in the figure, the lower fixed guide 61 can be further installed in the cutting unit 30.

[0132] The lower fixing guide 61 can be a fixing structure located on the side of the lower cutter 51 to fix the lower cutter 51. For example, when cutting the electrode plate 21, the lower fixing guide 61 supports the lower cutter 51 to prevent the lower cutter 51 from shaking.

[0133] Additionally, the lower fixed guide 61 can be vertically positioned below the upper movable guide 57. When the upper movable guide 57 moves downward, the upper movable guide 57 (e.g., the lower end portion of the upper movable guide 57) can come into contact with the lower fixed guide 61.

[0134] like Figure 16 As illustrated, the lower fixed guide 61 and the upper movable guide 57 can temporarily hold and fix a portion of the front end of the subsequent electrode plate 21b. The front end of the subsequent electrode plate 21b can be supported by both the lower fixed guide 61 and the upper movable guide 57 simultaneously. Because the subsequent electrode plate 21b is doubly supported, it can be supported more stably.

[0135] Figures 17 to 19 This is a view illustrating yet another example of an apparatus for manufacturing a secondary battery according to an embodiment of the present disclosure. Figures 17 to 19 The structure of the cutting unit 30 and Figures 14 to 16 The structure of the cutting unit 30 is the same. However, as Figure 19 As illustrated in the figure, the difference is that the upper moving guide 57 supports the front end of the subsequent electrode plate 21b while contacting the upper part of the lower fixed guide 61.

[0136] Figures 20 to 22 This is a view illustrating yet another example of an apparatus 20 for manufacturing a secondary battery according to an embodiment of the present disclosure.

[0137] As shown in the diagram, the upper fixed guide 63 can be fixedly mounted on the side of the upper cutter 41. The upper fixed guide 63 can be vertically positioned above the lower moving guide 53. Furthermore, when the lower moving guide 53 moves upward, the upper fixed guide 63 can contact the lower moving guide 53. Additionally, as... Figure 22 As shown in the figure, the front end portion of the subsequent electrode plate 21b can be held and supported between the lower moving guide 53 and the upper fixed guide 63.

[0138] Figure 23 This is a cross-sectional view illustrating a modified example of a moving guide included in an apparatus 20 for manufacturing secondary batteries according to an embodiment of the present disclosure.

[0139] like Figure 23As illustrated, the surface of the lower moving guide 53 or the upper moving guide 57 may be coated with an antistatic layer 71. The antistatic layer serves to prevent slippage due to static electricity during operation. In another embodiment, the lower moving guide 53 and the upper moving guide 57 may be treated with antistatic agents without the need for an antistatic layer.

[0140] Figure 24 This is a cross-sectional view illustrating a modified example of the fixing guide included in an apparatus 20 for manufacturing secondary batteries according to an embodiment of the present disclosure.

[0141] As illustrated, the surfaces of the lower fixing guide 61 and the upper fixing guide 63 may also be coated with an antistatic layer 71. The antistatic layer 71 can be used to prevent slippage due to static electricity during operation. In another embodiment, the lower fixing guide 61 and the upper fixing guide 63 may not be coated with the antistatic layer 71 and may be directly treated with antistatic agents.

[0142] According to the equipment for manufacturing secondary batteries and the electrode plate cutting unit for manufacturing secondary batteries as described herein, continuous cutting and reduced productivity can be achieved by supporting the cutting front end after cutting the electrode plate to prevent the electrode plate from falling off the normal conveying path.

[0143] Although this disclosure has been described herein with respect to its embodiments, it is not limited thereto. Various modifications and variations may be made thereto by those skilled in the art within the spirit of this disclosure as defined by the appended claims and their equivalents.

Claims

1. An apparatus for manufacturing secondary batteries, comprising: The conveying unit is configured to convey the electrode plates along the conveying path; A winding unit is configured to receive and wind the electrode plate conveyed by the conveying unit; and The cutting unit has a cutting section and a separation prevention section. The cutting section cuts the conveyed electrode plate, and the separation prevention section supports the front end of the subsequent electrode plate moving toward the winding unit in the conveying direction after the front end portion of the subsequent electrode plate is cut by the cutting section, so as to prevent the subsequent electrode plate from deviating from the conveying path toward the winding unit.

2. The device according to claim 1, wherein, The cutting section includes an upper cutter mounted above the conveying path of the electrode plate, and a lower cutter mounted below the conveying path to cut the electrode plate by intersecting with the upper cutter. The separation prevention part supports the front end portion of the subsequent electrode plate in the conveying direction to prevent the front end portion from drooping downwards due to gravity.

3. The device according to claim 2, wherein, The separation prevention part includes: A lower moving guide, mounted on the side of the lower cutter, supports the lower cutter and is movable upward and downward; and The first guide drive unit is configured to move the lower moving guide upward and downward.

4. The device according to claim 3, wherein, After the cutting part cuts the electrode plate, when the upper cutter moves upward, the first guide drive part simultaneously moves the lower moving guide upward so that the lower moving guide provides an upward support force for the front end portion of the subsequent electrode plate.

5. The method according to claim 2, wherein, The separation prevention part includes: The upper moving guide is mounted to be movable upward and downward on the side of the upper cutter; and The second guide drive is configured to move the upward moving guide upward and downward.

6. The device according to claim 5, wherein, The upper moving guide is located above the conveying path of the electrode plate, and After the cutting section cuts the electrode plate, as the upper cutter moves upward, the second guide drive section moves the upper moving guide downward so that the upper moving guide provides an upward supporting force for the front end portion of the subsequent electrode plate.

7. The device according to claim 5 or 6, wherein, A lower fixed guide is further vertically installed below the upper moving guide, the lower fixed guide fixedly supporting the lower cutter and contacting the upper moving guide when the upper moving guide moves downward.

8. The device according to claim 3 or 4, wherein, An upper fixed guide is further vertically installed above the lower moving guide, and the upper fixed guide comes into contact with the lower moving guide when the lower moving guide moves upward.

9. The device according to claim 3 or 4, wherein, The surface of the lower moving guide is coated with an antistatic layer.

10. The device according to claim 5 or 6, wherein, The surface of the upper moving guide is coated with an antistatic layer.

11. An electrode plate cutting unit, comprising: The upper cutter is installed above the conveying path of the electrode plates that are conveyed along the conveying path. A lower cutter is installed below the conveying path to cut the electrode plate; and The separation prevention section supports the front end portion of the subsequent electrode plate cut by the upper cutter and the lower cutter to prevent the subsequent electrode plate from drooping downwards and deviating from the conveying path.

12. The electrode plate cutting unit according to claim 11, wherein, The separation prevention section supports the front end portion of the subsequent electrode plate in the conveying direction to prevent the front end portion from drooping downwards due to gravity.

13. The electrode plate cutting unit according to claim 12, wherein, The separation prevention part includes: A lower moving guide, mounted on the side of the lower cutter and supporting the lower cutter, is movable upwards and downwards; and The first guide drive unit is configured to move the lower moving guide upward and downward.

14. The electrode plate cutting unit according to claim 13, wherein, After the cutting part cuts the electrode plate, when the upper cutter moves upward, the first guide drive part simultaneously moves the lower moving guide upward so that the lower moving guide provides an upward support force for the front end portion of the subsequent electrode plate.

15. The electrode plate cutting unit according to claim 12, wherein, The separation prevention part includes: The upper moving guide is installed to move upward and downward on the side of the upper cutter; and The second guide drive is configured to move the upward moving guide upward and downward.

16. The electrode plate cutting unit according to claim 15, wherein, The upper moving guide is located above the conveying path of the electrode plate, and After the cutting section cuts the electrode plate, as the upper cutter moves upward, the second guide drive section moves the upper moving guide downward so that the upper moving guide provides an upward supporting force for the front end portion of the subsequent electrode plate.

17. The electrode plate cutting unit according to claim 15 or 16, wherein, A lower fixed guide is further vertically installed below the upper moving guide, the lower fixed guide fixedly supporting the lower cutter and contacting the upper moving guide when the upper moving guide moves downward.

18. The electrode plate cutting unit according to claim 13 or 14, wherein, An upper fixed guide is further vertically installed above the lower moving guide, and the upper fixed guide comes into contact with the lower moving guide when the lower moving guide moves upward.

19. The electrode plate cutting unit according to claim 13 or 14, wherein, The surface of the lower moving guide is coated with an antistatic layer.

20. The electrode plate cutting unit according to claim 15 or 16, wherein, The surface of the upper moving guide is coated with an antistatic layer.

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