Cover assembly, secondary battery, and secondary battery inspection device

Abstract

Disclosed are a cap assembly, a secondary battery including the cap assembly, and a secondary battery inspection apparatus. The cover assembly includes: a lower cover; the exhaust part is positioned on the surface of the lower cover; and a mark on the other surface of the lower cover.

Description

[0001] Cross-reference to related applications

[0002] This application claims priority and benefit to Korean Patent Application No. 10-2024-0085439, filed on June 28, 2024, with the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference. Technical Field

[0003] This disclosure relates to a cover assembly, a secondary battery including the cover assembly, and an inspection device for inspecting the secondary battery. Background Technology

[0004] Unlike primary batteries, which cannot be recharged, secondary batteries are rechargeable and dischargeable. Low-capacity secondary batteries can be used in small portable electronic devices such as smartphones, feature phones, laptops, digital cameras, and camcorders, while high-capacity secondary batteries are widely used as motor drive power sources and energy storage batteries in vehicles such as hybrid vehicles and electric vehicles.

[0005] A secondary battery may include: electrodes, including a positive electrode and a negative electrode; an electrode assembly including the electrodes; a housing housing the electrode assembly; and a cover assembly coupled to an opening in the housing to seal the housing.

[0006] The cover assembly may include an exhaust element, a lower cover, and an insulator located between the exhaust element and the lower cover, insulating the exhaust element and the lower cover. The cover assembly may be manufactured, for example, by assembling the exhaust element, the lower cover, and the insulator.

[0007] In this case, the cover assembly presents a problem: if any component is not properly assembled, the casing cannot be properly sealed. For example, if any component becomes loose during the assembly process, or if cracks appear in the vent, lower cover, etc., the reliability and safety of the secondary battery are reduced.

[0008] The information disclosed above is provided to enhance understanding of the background of the present invention, and therefore may include information that does not constitute related technology. Summary of the Invention

[0009] According to one aspect of the present invention, a cover assembly and a secondary battery are provided, comprising a guide for easily inspecting internally formed cracks. According to another aspect of the present invention, a cover assembly and a secondary battery are provided capable of performing a non-destructive comprehensive inspection.

[0010] According to another aspect of the embodiments of the present invention, a secondary battery inspection apparatus is provided for inspecting cracks formed in the cover assembly and / or the secondary battery.

[0011] However, the aspects of the present invention and the technical problems to be solved by the present invention are not limited to the above-described aspects and problems. Those skilled in the art can clearly understand other aspects and problems not mentioned from the following description of the present invention.

[0012] According to one or more embodiments of the present invention, the cover assembly includes: a lower cover; an vent located on a surface of the lower cover; and a mark located on another surface of the lower cover.

[0013] According to one or more embodiments of the present invention, a secondary battery includes: a housing that accommodates an electrode assembly; and a cover assembly coupled to an opening in the housing to seal the housing, wherein the cover assembly includes: a lower cover; an vent located on a surface of the lower cover; and a marking located on another surface of the lower cover.

[0014] According to one or more embodiments of the present invention, a secondary battery inspection device includes: a vision camera configured to acquire an image of a cover assembly, the cover assembly including: a lower cover; an vent located on a surface of the lower cover; and a marker located on another surface of the lower cover; and a processor configured to extract the marker from the image and inspect the cover assembly using the extracted marker. Attached Figure Description

[0015] The accompanying drawings illustrate some embodiments of the present disclosure and further describe aspects and features of the present disclosure together with the detailed description thereof. However, the present disclosure is not to be construed as limited to the drawings, wherein:

[0016] Figure 1 This is a schematic cross-sectional view of a cylindrical secondary battery according to an embodiment of the present invention;

[0017] Figure 2 This is a schematic cross-sectional view of a cover assembly according to an embodiment of the present invention;

[0018] Figure 3 This is a schematic diagram illustrating the lower surface of a cover assembly according to an embodiment of the present invention;

[0019] Figure 4 This is a schematic diagram illustrating the lower surface of a cover assembly according to an embodiment of the present invention;

[0020] Figure 5 This is a schematic diagram illustrating the lower surface of a cover assembly according to an embodiment of the present invention;

[0021] Figure 6 This is a schematic diagram illustrating the lower surface of a cover assembly according to an embodiment of the present invention; and

[0022] Figure 7 This is a block diagram illustrating the components of a secondary battery inspection device according to an embodiment of the present invention. Detailed Implementation

[0023] This document will describe in further detail some exemplary embodiments of the invention with reference to the accompanying drawings. The terms or words used in this specification and claims are not to be construed as limited to their ordinary or dictionary meanings, but should be interpreted as having meanings and concepts consistent with the technical spirit of the invention, based on the principle that the inventor can appropriately define the concepts of the terms in order to best describe his or her invention. Accordingly, it should be understood that the embodiments described herein and the configurations illustrated in the drawings are merely some exemplary embodiments of the invention and do not necessarily represent all the technical spirit of the invention, and various equivalents and modifications may be substituted for them at the time of submission.

[0024] Furthermore, when used herein, the term “comprising” and its variations specify the presence of the mentioned shapes, numbers, steps, operations, components, elements and / or groups thereof, and are not intended to exclude the presence or addition of one or more other shapes, numbers, operations, components, elements and / or groups thereof.

[0025] Furthermore, for clarity of understanding, the accompanying drawings may not be drawn to scale, and the dimensions of some components may be exaggerated. Additionally, the same reference numerals may be assigned to the same components in different embodiments.

[0026] Statements describing two objects as "identical" or "equal" can mean identical or substantially identical. Thus, substantially identical can include deviations considered low in the art, such as less than 5%. Furthermore, uniformity of parameters over a given region can imply uniformity from an average perspective.

[0027] While terms like "first," "second," etc., can be used to describe various components, these components are not limited by these terms. These terms are used to distinguish one component from another, and unless otherwise specifically stated, it should be understood that a first component can also be a second component.

[0028] Throughout the manual, unless otherwise specifically stated, each element may be singular or plural.

[0029] When any component is set "above (or below)" a component or "above (or below)" a component, it can mean not only that any component is in contact with that component, but also that another component can be located between that component and any component set above (or below) that component.

[0030] Furthermore, when a component is described as “connected,” “linked,” or “attached” to another component, it should be understood that the components may be directly connected or linked to each other, but another component may be “between” the components, or each component may be “connected,” “linked,” or “attached” to another component. Additionally, when a component is electrically connected to another component, this includes direct connection, and also includes connections with another element in between.

[0031] Throughout the specification, “A and / or B” means A, B, or A and B, unless otherwise stated to the contrary. That is, “and / or” includes any or all of the listed items. When “C to D” is stated, it means greater than or equal to C and less than or equal to D, unless otherwise specifically stated.

[0032] The terminology used herein is intended to describe embodiments of this disclosure and is not intended to limit this disclosure.

[0033] Figure 1 This is a schematic cross-sectional view of a cylindrical secondary battery according to an embodiment of the present invention.

[0034] like Figure 1 As illustrated, a secondary battery (e.g., a cylindrical lithium-ion secondary battery) 100 according to an embodiment of the present invention may include a housing (e.g., a cylindrical housing) 50, an electrode assembly 40, and a cover assembly 200. Additionally, in one or more embodiments, the cylindrical lithium-ion secondary battery 100 may further include a center pin (not shown). Furthermore, in the secondary battery 100 according to one or more embodiments of the present disclosure, the cover assembly 200 also performs a current interruption operation, and therefore, the cover assembly 200 may also be referred to as a current interruption device.

[0035] The cylindrical housing 50 may include a generally circular bottom and cylindrical sidewalls extending upward from the outer periphery of the bottom for a length (e.g., a predetermined length). During the manufacturing process of the secondary battery, the upper portion of the cylindrical housing 50 is open. Therefore, during the assembly process of the secondary battery, the electrode assembly 40 and the center pin can be inserted into the cylindrical housing 50 along with the electrolyte. The cylindrical housing 50 may be made of, for example, steel, stainless steel, aluminum, aluminum alloys, or equivalent materials, but is not limited thereto.

[0036] Electrode assembly 40 can be housed within cylindrical housing 50. Electrode assembly 40 may include: a negative electrode 20, wherein a negative electrode active material (e.g., graphite, carbon, etc.) is coated on a negative current collector plate; a positive electrode 10, wherein a positive electrode active material (e.g., transition metal oxide (LiCoO2, LiNiO2, LiMn2O4, etc.)) is coated on a positive current collector plate; and a separator 30 located between the negative electrode 20 and the positive electrode 10 to prevent or substantially prevent short circuits and to allow lithium ion movement. In one embodiment, the negative electrode 20, the positive electrode 10, and the separator 30 may be wound into a generally cylindrical shape.

[0037] In one embodiment, the cover assembly 200 includes an upper cover. The cover assembly 200 may further include at least one of a lower cover, a vent, and an insulator. The cover assembly 200 is coupled to an opening in the housing 50 such that the electrode assembly 40 is sealed inside the housing 50.

[0038] However, the invention is not limited thereto, and the housing can be configured in any shape of various shapes, such as circular, bag-shaped, etc. Furthermore, the housing can be made of metals such as aluminum, aluminum alloys, nickel-plated steel, etc., or of the laminated film or plastic constituting the bag.

[0039] As described above, the electrode assembly 40 includes a negative electrode 20, a positive electrode 10, and a diaphragm 30 located between the negative electrode 20 and the positive electrode 10. Furthermore, the electrode assembly 40, together with an electrolyte (not shown), is housed in a cylindrical housing 50. This document describes the electrode assembly 40 and the electrolyte.

[0040] Positive electrode 10

[0041] As the positive electrode active material, compounds capable of reversibly inserting and deintercalating lithium (e.g., lithiation intercalation compounds) can be used. In one embodiment, at least one of the composite oxides of lithium and metals selected from cobalt, manganese, nickel, and combinations thereof can be used as the positive electrode active material.

[0042] The composite oxide can be a lithium transition metal composite oxide, and examples include lithium nickel-based oxides, lithium cobalt-based oxides, lithium manganese-based oxides, lithium iron phosphate compounds, cobalt-free nickel manganese-based oxides, or combinations thereof.

[0043] As an example, a compound represented by any of the following chemical 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-cD 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).

[0044] In the above chemical formula, 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.

[0045] The positive electrode 10 for a lithium secondary battery may include a current collector and a positive electrode active material layer formed on the current collector. The positive electrode active material layer may include a positive electrode active material, and may further include a binder and / or a conductive material.

[0046] In one embodiment, 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 90 wt% to 99 wt%, and based on 100 wt% of the positive electrode active material layer, the contents of the binder and the conductive material may each be in the range of 0.5 wt% to 5 wt%.

[0047] In one embodiment, Al (foil) may be used as the current collector, but the embodiment is not limited thereto.

[0048] Negative electrode 20

[0049] The negative electrode active material includes a material capable of reversibly inserting / extracting lithium ions, lithium metal, an alloy of lithium and a metal, a material capable of doping and dedoping lithium, or a transition metal oxide.

[0050] The material capable of reversibly inserting / extracting lithium ions may be a carbon-based negative electrode active material such as 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 or hard carbon, mesophase pitch carbide, calcined coke, etc.

[0051] As the material capable of doping and dedoping lithium, a Si-based negative electrode active material or a Sn-based negative electrode active material may be used. The Si-based negative electrode active material may be silicon, a silicon-carbon composite, SiO x (0 < x ≤ 2, for example SiO2), a Si-based alloy, or a combination thereof.

[0052] 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 an amorphous carbon coating coated on the surface of the silicon particles.

[0053] 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 located on the surface of the core.

[0054] The negative electrode 20 for the lithium secondary battery 100 includes a current collector and a negative electrode active material layer located on the current collector. The negative electrode active material layer may include a negative electrode active material, and may further include a binder and / or a conductive material.

[0055] In one embodiment, for example, the negative electrode active material layer may include 90 wt% to 99 wt% of negative electrode active material, 0.5 wt% to 5 wt% of binder, and 0 wt% to 5 wt% of conductive material.

[0056] As a binder, non-aqueous binders, aqueous binders, dry binders, or combinations thereof can be used. If an aqueous binder is used as a negative electrode binder, it may further include cellulose compounds capable of imparting viscosity.

[0057] As the negative electrode current collector, one or more of the following can be used: copper foil, nickel foil, stainless steel foil, titanium foil, nickel foam, copper foam, polymer substrate coated with conductive metal, and combinations thereof.

[0058] The electrolyte used in the lithium secondary battery 100 includes a non-aqueous organic solvent and a lithium salt.

[0059] Non-aqueous organic solvents are used as a medium through which ions participating in the electrochemical reactions of the battery can move.

[0060] Non-aqueous organic solvents can be carbonate-based solvents, ester-based solvents, ether-based solvents, ketone-based solvents, or alcohol-based solvents, aprotic solvents, or combinations thereof, and can be used alone or in combination of two or more.

[0061] Alternatively, if a carbonate-based solvent is used, a mixture of cyclic carbonates and chain carbonates can be used.

[0062] Diaphragm 30

[0063] Depending on the type of lithium secondary battery 100, a separator 30 may be present between the positive electrode 10 and the negative electrode 20. Polyethylene, polypropylene, polyvinylidene fluoride, or multilayer films having two or more of these layers may be used as separator 30.

[0064] The diaphragm may include: a porous substrate; and a coating, including an organic material, an inorganic material, or a combination thereof located on one or the opposite surface of the porous substrate.

[0065] Organic materials may include polyvinylidene fluoride polymers or (meth)acrylic acid polymers.

[0066] 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.

[0067] Organic and inorganic materials can exist as a mixture in a coating, or they can exist as a stack of coatings containing organic materials and coatings containing inorganic materials.

[0068] Figure 2 This is a schematic cross-sectional view of a cover assembly according to an embodiment of the present invention.

[0069] exist Figure 2 In the text, "200" represents the cover assembly according to an embodiment of the present invention.

[0070] The cover assembly 200 can be attached to an opening in the housing 50. For example, if the opening in the housing 50 is located at the upper part of the housing 50, the cover assembly 200 can be attached to the upper part of the housing 50. For example, if the opening in the housing 50 is located at the lower part of the housing 50, the cover assembly 200 can be attached to the lower part of the housing 50.

[0071] The cover assembly 200 can seal the interior of the housing 50. For example... Figure 1 As illustrated, the secondary battery 100 includes an electrode assembly 40 and an electrolyte (not shown) housed within a housing 50. A cover assembly 200 allows the electrode assembly 40 and the electrolyte to be safely contained within the housing 50.

[0072] Additionally, the cover assembly 200 prevents or substantially prevents heat transfer to adjacent secondary batteries and / or prevents or substantially prevents secondary battery 100 from exploding. In one embodiment, the cover assembly 200 is electrically connected to electrodes extending from the electrode assembly 40 (e.g., Figure 1 (The positive electrode 10 and / or negative electrode 20 are shown in the diagram). The cover assembly 200 allows the electrodes to be electrically connected to the outside, so that the secondary battery 100 can provide current or receive current from the outside.

[0073] In one embodiment, the cover assembly 200 includes a lower cover 230 and an exhaust 220 located on the surface of the lower cover 230.

[0074] Additionally, the cover assembly 200 may further include an upper cover 210, with an vent 220 provided between the upper cover 210 and the lower cover 230. Furthermore, the cover assembly 200 may further include an insulator 240 provided between the vent 220 and the lower cover 230. In one embodiment, the cover assembly 200 may further include a sub-plate 250 connecting the cover assembly 200 and the electrode assembly 40 (e.g., via a connection to a terminal block 41 connected to the electrode assembly 40).

[0075] In this document, each component of the cover assembly 200 is described with reference to an example of the cover assembly 200 being connected to an opening formed in the upper part of the housing 50.

[0076] In one embodiment, the upper cover 210 may be located at the uppermost side of the cover assembly 200. In one embodiment, the upper cover 210 is formed to project upwards. The upper cover 210 may include terminal portions for connecting external circuitry in the projecting portion. The upper cover 210 may further include one or more outlets around the terminal portions for venting gas.

[0077] The lower cover 230 is located below the upper cover 210. The lower cover 230 may have one or more holes 231 formed in at least a portion of the lower cover 230 (see...). Figure 3 ).

[0078] An exhaust vent 220 is located between the upper cover 210 and the lower cover 230. In one embodiment, the exhaust vent 220 may be formed to bulge downwards. In another embodiment, the exhaust vent 220 includes at least one recess 221. The recess 221 may be located, for example, in at least a portion of the region formed to bulge downwards in the exhaust vent 220. The exhaust vent 220 can discharge gases formed inside the secondary battery 100 to the outside of the housing 50.

[0079] For example, if the secondary battery 100 is overcharged and / or the secondary battery 200 malfunctions, gas may be generated inside the secondary battery. In this case, the pressure inside the housing 50 is increased by the gas. If the pressure inside the secondary battery 100 increases, the vent 220 can deform, causing the area formed as a downward convex region to bulge upward due to the pressure. Accordingly, the vent 220 can be electrically disconnected from the electrode assembly 40. In one embodiment, the vent 220 can be disconnected along the notch 221. If the vent 220 is disconnected, the gas inside the housing 50 is released to the outside of the housing 50. Accordingly, the cover assembly 200 can prevent or substantially prevent the secondary battery 100 from exploding.

[0080] An insulator 240 may be located between the lower cover 230 and the vent 220. In one embodiment, for example, the insulator 240 is located at the edge between the lower cover 230 and the vent 220. For example, the insulator 240 may be formed as an annular ring around the edge between the lower cover 230 and the vent 220. Accordingly, the insulator 240 may form a gap between the lower cover 230 and the vent 220.

[0081] Insulator 240 electrically insulates the lower cover 230 and the vent 220. In one embodiment, for example, insulator 240 may comprise a resin material such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), etc.

[0082] In one embodiment, for example, if the temperature inside the housing 50 rises, the insulator 240 may melt. In this case, gas generated inside the housing 50 flows into the gap between the lower cover 230 and the vent 220. The flowing gas increases the pressure in the space between the lower cover 230 and the vent 220, causing the vent 230 to rupture due to pressure. The gas can then be released to the outside through the ruptured vent 220. Therefore, gas generated inside the housing 50 is released to the outside of the housing 50.

[0083] Subplate 250 may be located on the underside of lower cover 230. In one embodiment, subplate 250 may be fixed to the lower surface of lower cover 230 to block hole 231 in lower cover 230. In one embodiment, subplate 250 may be fixedly or electrically connected to a downwardly protruding area in exhaust member 220.

[0084] Subplate 250 may be located on the upper part of electrode assembly 40. Subplate 250 may be connected to terminal block 41 extending from electrode assembly 40. For example, subplate 250 may have a surface that contacts vent 220 and / or lower cover 230 and another surface that contacts terminal block 41. In one embodiment, subplate 250 may be soldered to terminal block 41. In this case, terminal block 41 is electrically connected to... Figure 1 The positive electrode 10 or negative electrode 20 shown is formed by extending from the positive electrode 10 or negative electrode 20. For example, the terminal 41 includes a positive electrode terminal that is engaged with the positive electrode plate of the positive electrode 10 and extends from the positive electrode plate toward the top of the electrode assembly 40 to connect to the sub-plate 250.

[0085] With this configuration, the cover assembly 200 according to an embodiment of the present invention can prevent or substantially prevent the secondary battery 100 from exploding.

[0086] Figure 3 This is a schematic diagram illustrating the lower surface of a cover assembly according to an embodiment of the present invention.

[0087] exist Figure 3 In this context, "200" indicates a cover assembly according to an embodiment of the present invention (e.g., in...). Figure 1 and Figure 2 (The cover assembly 200 described in the text).

[0088] The cover assembly 200 includes a lower cover 230, an exhaust 220 located on a surface of the lower cover 230, and a marking 260 formed on another surface of the lower cover 230. In one embodiment, the cover assembly 200 may further include a sub-plate 250.

[0089] The vent 220 is located on the surface of the lower cover 230. For example, the vent 220 is located on the upper surface of the lower cover 230. For example, the vent 220 is located on the upper part of the lower cover 230 and is engaged with the lower cover 230. In one embodiment, as... Figure 2 As described, the insulator 240 is located between the exhaust member 220 and the lower cover 230, such that when the exhaust member 220 and the lower cover 230 are engaged, the exhaust member 220 and the lower cover 230 can be tightly engaged.

[0090] Subplate 250 is located on another surface of lower cover 230. For example, subplate 250 is located on the lower surface of lower cover 230. In one embodiment, for example, subplate 250 may be located on the lower part of lower cover 230 and may be joined to vent 220 and lower cover 230 by welding. In one embodiment, welding may include ultrasonic welding, but the type of welding is not limited to this and may include laser welding, etc.

[0091] In this situation, the cover assembly 200 may receive physical forces or torques in the rotational direction. Cracks may occur at the welded portions where the vent 220 and lower cover 230 are welded to the sub-plate 250. If a crack occurs between the sub-plate 250 and the vent 220 and lower cover 230, the secondary battery 100 may short-circuit. In particular, even a very slight rotation of less than 5° due to torque may cause cracks in the welded portions.

[0092] In the cover assembly 200 according to the embodiment, since the vent 220 and the lower cover 230 are in contact with the sub-plate 250 even if a crack occurs, a short circuit may not occur at the welded portion. In this case, the secondary battery 100 can conduct normal current during operation to test the performance or safety of the secondary battery 100 and can be determined to be a qualified product during infrared (IR) testing. In this case, the reliability of the secondary battery 100 may decrease as the crack later increases.

[0093] For example, the cover assembly 200 according to an embodiment of the invention includes a marking 260. The marking 260 provides guidance for determining whether torque is applied between the exhaust member 220 and the lower cover 230. Accordingly, the cover assembly 200 provides a method for performing a non-destructive full inspection in a finished product state.

[0094] In one embodiment, a mark 260 is formed on the side of the lower cover 230 opposite to the side where the vent 220 is provided. For example, the mark 260 is formed on the lower surface of the lower cover 230.

[0095] In one implementation, such as Figure 2 and Figure 3As illustrated, when viewed from the upper or lower surface of the cover assembly 200, the vent 220 can be formed to have a larger cross-sectional area than the lower cover 230. Accordingly, when viewed from the upper surface of the cover assembly 200, the lower cover 230 may be invisible because it is covered by the vent 220. In one embodiment, when viewed from the lower surface of the cover assembly 200, the vent 220 may appear to surround the outer surface of the lower cover 230 and extend radially outward from it. In this case, the lower surface of the cover assembly 200 is the side where the sub-plate 250 is located in the cover assembly 200.

[0096] For example, when viewed from the lower surface of the cover assembly 200, a mark 260 may be formed at the boundary line between the vent 220 and the lower cover 230. For example, as... Figure 3 As illustrated, mark 260 can be formed from the boundary line toward the interior of the lower cover 230. In one embodiment, mark 260 can be formed across the boundary line.

[0097] although Figure 3 The illustrated cover assembly 200 includes an example of a mark 260, but the cover assembly 200 may include one or more marks 260. In one embodiment, for example, when the cover assembly 200 includes multiple marks 260, all of the multiple marks 260 may be formed along the boundary line. In one embodiment, some of the multiple marks 260 may be formed along the boundary line, and the remaining marks 260 may be formed inside the lower surface of the lower cover 230. In one embodiment, all of the multiple marks 260 may be formed inside the lower surface of the lower cover 230.

[0098] The mark 260 may include any form of identification mark formed on the lower surface of the lower cover 230, without limitation on length, shape, and / or size. In one embodiment, for example, the mark 260 may have such... Figure 3 The linear shape is illustrated in the figure. In one embodiment, for example, the mark 260 can be formed in any form, such as a circle, polygon, company logo, badge, text, symbol, etc. In one embodiment, for example, the mark 260 can be formed to occupy less than 1% of the total area of ​​the lower cover 230. In one embodiment, for example, the mark 260 can be formed to occupy more than 50% of the total area of ​​the lower cover 230.

[0099] In one embodiment, the mark 260 may be formed in a two-dimensional shape on the lower surface of the lower cover 230.

[0100] In one embodiment, for example, mark 260 can be formed by printing on the lower surface of the lower cover 230. For example, mark 260 can be formed by printing, applying and / or coating a paint such as ink on the lower cover 230.

[0101] In one embodiment, for example, label 260 may include a sticker attached to lower cover 230. In this case, the sticker may include any form that can be attached to lower cover 230 by forming an adhesive material on at least one side. For example, the adhesive material includes at least one selected from the group consisting of polyurethane, epoxy resin, and polyolefin.

[0102] In one embodiment, the mark 260 may be formed in a three-dimensional shape on the lower surface of the lower cover 230.

[0103] In one embodiment, for example, mark 260 includes an intaglio formed on the lower cover 230. The intaglio may include a three-dimensional shape formed from the lower surface of the lower cover 230 toward the interior of the lower cover 230. For example, the intaglio may be formed by laser and / or stamping. For example, the intaglio may include any shape of various shapes such as polygonal prisms, pyramids, cylinders, cones, etc. In one embodiment, the intaglio may be formed, for example, by etching. For example, the intaglio may include an irregular three-dimensional shape.

[0104] In one embodiment, for example, mark 260 includes an embossing formed on the lower cover 230. The embossing may include a three-dimensional shape formed from the lower surface of the lower cover 230 toward the outer side of the lower cover 230. For example, the embossing may be formed by laser. The embossing may include any shape of various shapes such as a polygonal prism, a polygonal pyramid, a cylinder, a cone, etc., and may further include irregular three-dimensional shapes.

[0105] Thus, by means of the mark 260, the cover assembly 200 according to an embodiment of the invention provides a guide for determining whether torque is applied between the exhaust member 220 and the lower cover 230. For example, if the mark 260 moves to a position different from the previously formed position, it can be seen that rotation has occurred between the exhaust member 220 and the lower cover 230. If rotation occurs between the exhaust member 220 and the lower cover 230, even if the rotation corresponds to a small angle, cracks may appear in the welded portion.

[0106] By way of marking 260, the cover assembly 200 provides a method for quickly and easily inspecting cracks that may not be detectable by electrical conduction inspection. Various embodiments of marking 260 will be described herein.

[0107] Figure 4 This is a schematic diagram illustrating the lower surface of a cover assembly according to an embodiment of the present invention.

[0108] exist Figure 4 In this context, "200" indicates a cover assembly according to an embodiment of the present invention (e.g., Figures 1 to 3 (The cover assembly 200 described in the text).

[0109] The cover assembly 200 may further include a sub-marker 270 formed on the surface of the vent 220.

[0110] Sub-mark 270 is formed on the surface of exhaust member 220. In this case, among two or opposite surfaces of exhaust member 220, sub-mark 270 is formed on the surface of exhaust member 220 facing the lower cover 230. For example, the surface of exhaust member 220 on which sub-mark 270 is formed is the lower surface of exhaust member 220.

[0111] In one embodiment, for example, when viewed from the lower surface of the cover assembly 200, a sub-marker 270 may be formed at the boundary line between the vent 220 and the lower cover 230. For example, as Figure 4 As illustrated, the sub-marker 270 can be formed from the boundary line toward the outer surface of the exhaust member 220. In one embodiment, the sub-marker 270 can be formed across the boundary line on the exhaust member 220.

[0112] although Figure 4 The illustration shows an example of a cover assembly 200 including a sub-marker 270, but the cover assembly 200 may include one or more sub-markers 270.

[0113] Sub-mark 270 may include any form of identification mark formed on the lower surface of the lower cover 230, without limitation on length, shape and / or size.

[0114] In one embodiment, the sub-marker 270 may be formed in a two-dimensional shape on the lower surface of the exhaust member 220.

[0115] In one embodiment, for example, the sub-mark 270 can be formed by printing on the lower surface of the exhaust member 220. For example, the sub-mark 270 can be formed by printing, applying and / or coating a paint such as ink on the exhaust member 220.

[0116] For example, in one embodiment, sub-marker 270 includes a sticker attached to exhaust member 220. In this case, the sticker may include any form that attaches to exhaust member 220 by forming an adhesive material on at least one side. In one embodiment, for example, the adhesive material includes at least one selected from the group consisting of polyurethane, epoxy resin, and polyolefin.

[0117] In one embodiment, the sub-marker 270 may be formed in a three-dimensional shape on the lower surface of the exhaust member 220.

[0118] In one embodiment, for example, sub-marker 270 includes an intaglio pattern formed on exhaust member 220. The intaglio pattern includes a three-dimensional shape formed from the lower surface of exhaust member 220 toward the interior of exhaust member 220. For example, the intaglio pattern can be formed by laser and / or stamping. For example, the intaglio pattern can include any shape from a variety of shapes such as a polygonal prism, a polygonal pyramid, a cylinder, a cone, etc. In one embodiment, the intaglio pattern can also be formed, for example, by etching. In one embodiment, for example, the intaglio pattern includes an irregular three-dimensional shape.

[0119] In one embodiment, for example, sub-marker 270 includes an embossing formed on exhaust member 220. The embossing includes a three-dimensional shape formed from the lower surface of exhaust member 220 toward the exterior of exhaust member 220. In one embodiment, for example, the embossing can be formed by laser. The embossing can include any shape of various shapes such as polygonal prisms, pyramids, cylinders, cones, etc., and in one embodiment, includes an irregular three-dimensional shape.

[0120] In one embodiment, sub-mark 270 may be formed as a corresponding mark 260. For example, if mark 260 is formed as a three-dimensional shape, then sub-mark 270 may be formed as a three-dimensional shape. For example, if mark 260 is formed as a straight line shape, then sub-mark 270 may be formed as a straight line shape. In one embodiment, for example, mark 260 and sub-mark 270 each comprise a three-dimensional intaglio formed by laser and / or mold.

[0121] In one embodiment, sub-mark 270 is formed independently of mark 260. For example, if mark 260 is formed in a three-dimensional shape, sub-mark 270 may be formed in a two-dimensional shape. For example, if mark 260 is formed in a linear shape, sub-mark 270 may be formed in a circular shape. In one embodiment, for example, mark 260 may comprise a three-dimensional intaglio formed by laser and / or mold, and sub-mark 270 may comprise a two-dimensional printed material printed by coating.

[0122] In one embodiment, for example, sub-marker 270 is formed (e.g., positioned) to connect with mark 260. In one embodiment, for example, when viewed from the lower surface of the cover assembly 200, mark 260 may contact sub-marker 270 at the boundary between vent 220 and lower cover 230.

[0123] For example, such as Figure 4 As illustrated, mark 260 can be formed in a straight line shape. In this case, one side of mark 260 contacts the boundary line, and the other side of mark 260 covers the inside of 230 downwards. In one embodiment, for example, as shown... Figure 4As illustrated, sub-mark 270 can be formed in a straight line shape. In this case, one side of sub-mark 270 contacts the boundary line, and the other side of sub-mark 270 faces the outer surface of exhaust member 220. In this case, one side of mark 260 and one side of sub-mark 270 can be connected while contacting each other at the boundary line. In this case, for example, sub-mark 270 can be connected to mark 260 to form an I shape.

[0124] When the marker 260 and the sub-marker 270 are connected, the cover assembly 200 can provide guidance on whether rotation and / or cracking has occurred in the cover assembly 200 through the connection of the marker 260 and the sub-marker 270. For example, if the vent 220 and the lower cover 230 rotate relative to each other, the connection between the marker 260 and the sub-marker 270 may become misaligned or break.

[0125] The cover assembly 200 can provide guidance for generating torque and / or creating cracks in the welded portion by the positional relationship of the marker 260 and the sub-marker 270.

[0126] Figure 5 This is a schematic diagram illustrating the lower surface of a cover assembly according to an embodiment of the present invention.

[0127] exist Figure 5 In this context, "200" indicates a cover assembly according to an embodiment of the present invention (e.g., Figures 1 to 3 (The cover assembly 200 described in the text).

[0128] The cover assembly 200 may further include a sub-marker 270 formed on the surface of the vent 220.

[0129] Sub-mark 270 is formed on the surface of exhaust member 220. In this case, among the two or opposite surfaces of exhaust member 220, the surface of exhaust member 220 on which sub-mark 270 is formed is the surface facing the lower cover 230. For example, the surface of exhaust member 220 on which sub-mark 270 is formed is the lower surface of exhaust member 220.

[0130] although Figure 5 The illustration shows an example of a cover assembly 200 including two sub-markers 270, but the cover assembly 200 may also include one or more sub-markers 270.

[0131] The sub-mark 270 may include any form of identification mark formed on the lower surface of the lower cover 230, without limitation on length, shape, and / or size. In one embodiment, the sub-mark 270 may be formed in a two-dimensional shape on the lower surface of the exhaust member 220. In one embodiment, the sub-mark 270 may be formed in a three-dimensional shape on the lower surface of the exhaust member 220. The description of the shape of the sub-mark 270 or the method of forming the sub-mark 270 may be related to... Figure 4 The description is the same as or similar to that described in [the previous text]. Furthermore, the description of the morphological association between sub-marker 270 and mark 260 can be similar to [the previous text]. Figure 4 The same or similar as described in the text.

[0132] In one embodiment, for example, sub-mark 270 is formed by staggering it with mark 260. In this case, "staggered arrangement" means that when viewed from the lower surface of the cover assembly 200, sub-mark 270 and mark 260 are not connected to each other at the boundary line of the boundary between the corresponding exhaust vent 220 and the lower cover 230.

[0133] In one embodiment, for example, the cover assembly 200 includes a mark 260 and a sub-mark 270. For example, the sub-mark 270 and the mark 260 may be configured such that one side of the sub-mark 270 and one side of the mark 260 are in contact with a boundary line. In one embodiment, one side of the sub-mark 270 and one side of the mark 260 may not be connected at the boundary line, but may be adjacent to each other at the boundary line.

[0134] In one implementation, such as Figure 5 As illustrated, for example, the cover assembly 200 includes a marker 260 and two sub-markers 270. For example, sub-markers 270 may include a first sub-marker 270a and a second sub-marker 270b formed spaced apart from each other. For example, sub-markers 270 and 260 may be configured such that one side of sub-marker 270 and one side of mark 260 contact a boundary line. In one embodiment, one side of sub-marker 270 and one side of mark 260 may not be connected at the boundary line, but may be configured to be adjacent to the boundary line. That is, a portion of one side of mark 260 may obliquely intersect a portion of one side of the first sub-marker 270a. In one embodiment, another portion of one side of mark 260 may obliquely intersect a portion of one side of the second sub-marker 270b.

[0135] In one embodiment, for example, the cover assembly 200 includes two marks 260 and a sub-mark 270. For example, mark 260 includes a first mark (not shown) and a second mark (not shown) spaced apart from each other. For example, sub-mark 270 and mark 260 may be configured such that one side of sub-mark 270 and one side of mark 260 contact a boundary line. In one embodiment, one side of sub-mark 270 and one side of mark 260 may not be connected at the boundary line, but may be configured to be adjacent to the boundary line. That is, a portion of one side of sub-mark 270 may intersect obliquely with a portion of one side of the first mark. In one embodiment, another portion of one side of sub-mark 270 may intersect obliquely with a portion of one side of the second mark.

[0136] In one embodiment, for example, the cover assembly 200 may include a plurality of markers 260 and a plurality of sub-markers 270. In this case, the plurality of markers 260 and the plurality of sub-markers 270 may be arranged in an alternating manner. In one embodiment, the plurality of markers 260 and the plurality of sub-markers 270 may be configured such that some markers are connected and other markers are arranged in an alternating manner. In one embodiment, the plurality of markers 260 and the plurality of sub-markers 270 may be configured such that all of the plurality of markers 260 and the plurality of sub-markers 270 are connected to each other.

[0137] If mark 260 and sub-mark 270 are set to misalign, the cover assembly 200 can provide guidance indicating whether rotation and / or cracking has occurred in the cover assembly 200 by whether mark 260 and sub-mark 270 are connected. For example, if the vent 220 and the lower cover 230 rotate relative to each other, mark 260 and sub-mark 270, which are set to be misaligned relative to each other, may partially overlap and / or may be connected to each other.

[0138] The cover assembly 200 can provide guidance for inducing torque and / or cracking in welded portions by the positional relationship of the marker 260 and the sub-marker 270. Additionally, the cover assembly 200 can provide guidance for detecting minute angular rotation between the exhaust 220 and the lower cover 230 due to minute torque.

[0139] In one implementation, although in Figure 4 and Figure 5 Not shown, but the cover assembly 200 may have markings 260 and sub-markers 270 of different sizes to provide guidance indicating the degree of rotation between the exhaust 220 and the lower cover 230.

[0140] For example, sub-mark 270 may contact the boundary line over a relatively large area, and mark 260 may contact the boundary line over a relatively small area. In this case, in the normal state where the exhaust 220 and the lower cover 230 are not rotating, mark 260 may be formed to contact the boundary line while pointing to one side of the area of ​​sub-mark 270.

[0141] If the exhaust 220 and the lower cover 230 rotate, and the degree of rotation is small, the mark 260 can move a relatively short distance from one side of the area of ​​the sub-marker 270 to point to the sub-marker 270. If the exhaust 220 and the lower cover 230 rotate, and the degree of rotation is large, the mark 260 can move a relatively long distance from one side of the area of ​​the sub-marker 270 to point to the sub-marker 270. In this case, to accurately measure the degree of torque generated, the sub-marker 270 may include a scale.

[0142] Thus, since sub-mark 270 is used as a scale and mark 260 is used as a pointer, cover assembly 200 can provide guidance that indicates not only whether torque has been generated, but also the degree to which torque has been generated.

[0143] Figure 6 This is a schematic diagram illustrating the lower surface of a cover assembly according to an embodiment of the present invention.

[0144] exist Figure 6 In this context, "200" indicates a cover assembly according to an embodiment of the present invention (e.g., Figures 1 to 5 (The cover assembly 200 described in the text).

[0145] According to an embodiment of the invention, the mark 260 may be formed by an adhesive tape 261 that connects the surface of the exhaust member 220 (e.g., the lower surface of the exhaust member 220) to another surface of the lower cover 230 (e.g., the lower surface of the lower cover 230).

[0146] refer to Figures 3 to 5 As already described, mark 260 and / or sub-mark 270 can be formed by stickers. For example, mark 260 may include a sticker attached to the lower surface of the lower cover 230, and sub-mark 270 may include a sticker attached to the lower surface of the exhaust 220.

[0147] In one implementation, such as Figure 6 As illustrated, mark 260 includes adhesive tape 261 attached to the lower surface of exhaust 220 and the lower surface of lower cover 230. In one embodiment, adhesive tape 261 includes a single sticker extending from lower cover 230 toward exhaust 220, rather than two stickers separated at the boundary between lower cover 230 and exhaust 220.

[0148] Thus, the mark 260 includes an adhesive tape 261, one side of which is attached to the lower cover 230 and extends from the lower cover 230 toward the exhaust 220, and the other side is attached to the exhaust 220.

[0149] By observing whether the adhesive tape 261 is wrinkled or broken, the cover assembly 200 can provide a guide indicating whether rotation and / or cracking has occurred in the cover assembly 200. For example, if the vent 220 and the lower cover 230 rotate relative to each other, at least a portion of the adhesive tape 261 is wrinkled or a portion of the adhesive tape 261 is broken.

[0150] The cover assembly 200 can provide guidance for generating torque between the vent 220 and the lower cover 230 and / or for generating cracks in the welded portion via the adhesive tape 261.

[0151] Figure 7 This is a block diagram illustrating the components of a secondary battery inspection device according to an embodiment of the present invention.

[0152] exist Figure 7 In the text, "300" indicates a secondary battery inspection device according to an embodiment of the present invention.

[0153] The secondary battery inspection device 300 is used for inspection Figures 1 to 6 The cover assembly 200 and / or the secondary battery 100 including the cover assembly 200 are described herein. In one embodiment, for example, the secondary battery inspection device 300 is a device for inspecting whether rotation has occurred inside the cover assembly 200. In another embodiment, for example, the secondary battery inspection device 300 is a device for inspecting whether cracks have occurred inside the cover assembly 200.

[0154] In one embodiment, the secondary battery inspection device 300 includes: a vision camera 310 for acquiring an image of a cover assembly 200, the cover assembly 200 including a lower cover 230, an exhaust 220 located on a surface of the lower cover 230, and a mark 260 formed on another surface of the lower cover 230; and a processor 330 for extracting the mark 260 from the image and using the extracted mark 260 to inspect the cover assembly 200.

[0155] The vision camera 310 can be any type of camera that acquires images of an object visually. The vision camera 310 acquires images of the cover assembly 200. For example, the vision camera 310 acquires an image of the lower surface of the cover assembly 200.

[0156] The processor 330 controls all or some of the components included in the secondary battery inspection device 300. In one embodiment, for example, the processor 330 includes a central processing unit (CPU) or the like.

[0157] Processor 330 extracts marker 260 and / or sub-marker 270 from an image of cover assembly 200. Processor 330 determines the position of the extracted marker 260 and / or sub-marker 270. Processor 330 determines whether rotation has occurred in cover assembly 200 based on the position of marker 260 and / or sub-marker 270.

[0158] For example, processor 330 compares the positions of marker 260 and / or sub-marker 270 with pre-stored data. If the positions of marker 260 and / or sub-marker 270 are different from the pre-stored data, processor 330 determines that rotation has occurred in cover assembly 200, and if the positions of marker 260 or sub-marker 270 are the same as the pre-stored data, it determines that no rotation has occurred in cover assembly 200.

[0159] If no rotation occurs in the cover assembly 200, the pre-stored data is data indicating the position of marker 260 and / or sub-marker 270. The pre-stored data may be stored in the form of, for example, images, coordinates, etc.

[0160] For example, processor 330 compares the relationship between marker 260 and sub-marker 270. If marker 260 and sub-marker 270 are connected without rotation occurring in cover assembly 200, then processor 330 determines that rotation has occurred in cover assembly 200 if marker 260 and sub-marker 270 are not aligned. If marker 260 and sub-marker 270 are misaligned without rotation occurring in cover assembly 200, then processor 330 determines that rotation has occurred in cover assembly 200 if at least a portion of marker 260 and sub-marker 270 are connected.

[0161] The method by which the processor 330 uses marker 260 to determine whether the cover assembly 200 has rotated is not limited to the method described above. The processor 330 may be based on... Figures 3 to 6 The various examples or combinations thereof shown in the diagram determine whether the cover assembly 200 rotates.

[0162] If it is determined that no rotation has occurred in the cover assembly 200, the processor 330 outputs that the inspection result of the cover assembly 200 is a qualified product. If it is determined that rotation has occurred in the cover assembly 200, the processor 330 outputs that the inspection result of the cover assembly 200 is a defective product.

[0163] The mark 260 formed in the cover assembly 200 may itself be faulty. For example, even if the cover assembly 200 is not rotated, mark 260 may be formed not to be connected to the sub-mark 270.

[0164] In one embodiment, the secondary battery inspection device 300 may further include a mark inspection unit 320, which checks whether the mark 260 is formed at a certain (e.g., preset) position.

[0165] The mark checking unit 320 checks whether the mark 260 and / or sub-mark 270 were formed in response to a pre-stored input value. For example, the mark checking unit 320 checks whether the mark 260 and / or sub-mark 270 retrieved by the processor 330 have already been formed in response to a pre-stored input value. In this case, the pre-stored input value is data indicating the position and / or placement relationship of the mark 260 and / or sub-mark 270 in the cover assembly 200 where no rotation has occurred.

[0166] If the marking inspection unit 320 determines that the mark 260 and / or sub-mark 270 are formed at a preset position, the processor 330 performs an inspection on the cover assembly 200 and / or the secondary battery 100. If it is determined that the mark 260 and / or sub-mark 270 are not formed at the preset position, the processor 330 can identify the corresponding cover assembly 200 and / or secondary battery 100 as a defective product. In one embodiment, if it is determined that the mark 260 and / or sub-mark 270 are not formed at the preset position, the processor 330 can perform an inspection on the corresponding cover assembly 200 and / or secondary battery 100 only after changing the pre-stored data. In this case, the changed pre-stored data includes data regarding the position of the mark 260 and / or sub-mark 270 that are not formed at the preset position.

[0167] With this configuration, the secondary battery inspection device 300 according to one or more embodiments of the present invention can perform a comprehensive inspection without damaging the cover assembly 200 and / or the secondary battery 100 including the cover assembly 200.

[0168] According to one or more embodiments of the present invention, a non-destructive comprehensive inspection is provided for cover components and / or finished secondary battery products.

[0169] According to one or more embodiments of the present invention, a cover assembly and / or a secondary battery with improved safety and / or reliability are provided.

[0170] According to one or more embodiments of the present invention, the cover assembly and / or secondary battery can be inspected with high precision in a short time.

[0171] However, the aspects and features obtained by the present invention are not limited to those described above, and those skilled in the art will clearly understand from the description of the present invention other aspects and technical effects not mentioned.

[0172] Although the present invention has been described above with reference to some exemplary embodiments and accompanying drawings, the present invention is not limited thereto, and those skilled in the art can make various modifications and changes within the equivalent scope of the technical concept of the present invention and the claims.

Claims

1. A cover assembly comprising: a lower cover; a vent on a surface of the lower cover; and a mark on another surface of the lower cover. The cover assembly further comprises a sub-mark on a surface of the vent facing the lower cover.

2. The cap assembly of claim 1, wherein, The sub-mark is positioned to be connected to the mark.

3. The cap assembly of claim 2, wherein, The sub-mark is positioned to be connected to the mark to form a straight line shape.

4. The cap assembly of claim 2, wherein, The sub-mark is positioned to be arranged in an interlaced manner with the mark.

5. The cap assembly of claim 2, wherein, The mark comprises an engraving or a relief on the another surface of the lower cover.

6. The cap assembly of claim 1 or 2, wherein, The engraving is formed by a laser or a punching, and the relief is formed by the laser.

7. The cap assembly of claim 6, wherein, The mark comprises a paint printed on the another surface of the lower cover.

8. The cap assembly of claim 1 or 2, wherein, The mark comprises an adhesive tape connecting a surface of the vent and the another surface of the lower cover.

9. The cap assembly of claim 1, wherein, 10.A secondary battery comprising: a case accommodating an electrode assembly; and a cover assembly coupled to an opening of the case to seal the case, wherein the cover assembly is the cover assembly according to any one of claims 1 to 9. 11.A secondary battery inspection device comprising: a vision camera configured to acquire an image of a cover assembly of a secondary battery, the cover assembly being the cover assembly according to any one of claims 1 to 9; and a processor configured to extract the mark from the image and inspect the cover assembly using the extracted mark. 12.The secondary battery inspection device according to claim 11, further comprising a mark inspection section configured to inspect whether the mark is formed at a preset position. ​ ​ ​

Images