Disassembly apparatus for cylindrical rechargeable batteries

Abstract

A disassembly apparatus for cylindrical secondary batteries, of the present invention, is used to disassemble a cylindrical secondary battery comprising an electrode assembly and a case that accommodates the electrode assembly and includes a beading part recessed to a predetermined depth. The disassembly apparatus comprises: a stage; a gripping unit which is installed on the stage, grips the cylindrical secondary battery, and rotates the cylindrical secondary battery; a spreading unit which is fixed to the stage and spreads the beading part to deform same; and a cutting unit which is fixed to the stage, is installed adjacent to the spreading unit, and cuts the deformed beading part.

Description

Disassembly device for cylindrical secondary batteries

[0001] The present invention relates to a disassembly device for a cylindrical secondary battery.

[0002] As technological development and demand for mobile devices increase, the demand for secondary batteries as an energy source is rapidly increasing. Among such secondary batteries, lithium secondary batteries with high energy density and discharge voltage have been studied extensively and are now commercialized and widely used.

[0003] These secondary batteries are classified into cylindrical and prismatic batteries, in which the electrode assembly is built into a cylindrical or prismatic metal can, and pouch-type batteries, in which the electrode assembly is built into a pouch-type case made of aluminum laminate sheet, depending on the shape of the battery case.

[0004] In addition, the electrode assembly built into the battery case is a rechargeable power plant having a stacked structure of anode / separator / cathode, and is classified into a jelly roll type in which a separator is interposed between long sheet-shaped cathodes coated with active materials and wound, and a stack type in which a plurality of cathodes and anodes of a predetermined size are sequentially stacked with a separator interposed between them. Among them, the jelly roll type electrode assembly has the advantages of being easy to manufacture and having a high energy density per weight.

[0005] Jelly roll-type electrode assemblies are mainly used in cylindrical and square batteries, and Fig. 1 schematically illustrates a vertical cross-sectional perspective view of a cylindrical battery including a jelly roll-type electrode assembly.

[0006] Typically, a cylindrical battery consists of a cylindrical can and a jelly roll-shaped electrode assembly housed inside the can.

[0007] These cylindrical batteries have different characteristics depending on their intended use. For example, when used as a power source for devices like cell phones and laptops, a secondary battery that provides a stable, constant output is required. On the other hand, when used as a power source for power tools like electric drills, a secondary battery that can provide high output for a short period of time while remaining stable against external physical shocks like vibration and dropping is required.

[0008] Therefore, various cylindrical batteries are being designed, and it is necessary to verify that the manufactured cylindrical batteries exhibit the desired characteristics as designed. This verification is also necessary for evaluating third-party products and for identifying the cause of accidents such as fires or explosions.

[0009] To inspect these products, the internal electrode assembly and other components must be recovered. Therefore, disassembling the battery case (the can) is a priority. To do this, the inspector typically uses a sharp tool to cut open the battery case.

[0010] However, since the disassembly process described above relies on the operator's experience and intuition, for example, the depth of insertion of a sharp tool into the battery case may not be consistent, which may result in damage or deformation of the electrode assembly embedded in the battery case, and often even lead to power failures or short circuits. Therefore, there is a problem that makes it difficult to perform an accurate analysis of the product.

[0011] The present invention is intended to overcome the above-described conventional problems, and an object of the present invention is to provide a disassembly device for a cylindrical secondary battery capable of disassembling a secondary battery without damaging an electrode assembly.

[0012] However, the technical problems to be solved by the present invention are not limited to the problems described above, and other problems not mentioned can be clearly understood by those skilled in the art from the description of the invention described below.

[0013] A disassembly device for a cylindrical secondary battery according to the present invention is a disassembly device for a cylindrical secondary battery used for disassembling a cylindrical secondary battery including an electrode assembly and a case that accommodates the electrode assembly and includes a beading portion inserted into a predetermined depth, the disassembly device comprising: a stage; a holding unit installed on the stage, which holds the cylindrical secondary battery and rotates the cylindrical secondary battery; a spreading unit fixed to the stage, which spreads and deforms the beading portion; and a cutting unit fixed to the stage, which is installed adjacent to the spreading unit, and which cuts the deformed beading portion.

[0014] The above-mentioned spreading unit may include a first pillar member having one side fixedly connected to the stage, a fixed member installed on the first pillar member and having one end positioned adjacent to the beading portion, a moving member connected to the first pillar member so as to move along the longitudinal direction of the first pillar member, positioned spaced apart from the fixed member, and having one end positioned adjacent to the beading portion, and an elevating member that moves the moving member so that the moving member moves away from the fixed member or approaches the fixed member.

[0015] The above-mentioned lifting member can raise and lower the above-mentioned moving member by a certain height at a standard time interval.

[0016] The above-mentioned lifting member may include a rack gear installed inside the first pillar member and fixedly coupled to one side of the movable member, and a pinion gear installed inside the first pillar member to mesh with the rack gear and raise or lower the rack gear.

[0017] The above cutting unit may include a second pillar member having one side fixedly connected to the stage, and a cutting member fixedly connected to the second pillar member and positioned adjacent to the beading portion to cut the beading portion deformed by the spreading unit.

[0018] The stage may further include a distance measuring unit installed on the stage and measuring the distance to the part deformed by the spreading unit.

[0019] The distance measuring unit may include a third pillar member having one side fixedly connected to the stage, a distance measuring member fixedly connected to the third pillar member and measuring a distance to the beading portion, and a control unit that varies the moving distance of the moving member based on the distance value measured by the distance measuring member.

[0020] The above distance measuring unit may be positioned between the spreading unit and the cutting unit.

[0021] When the distance value measured by the distance measuring member exceeds the target distance value, the control unit can control the lifting member to increase the elevation height of the movable member.

[0022] When the distance value measured by the distance measuring member is a target distance value, the control unit can control the elevating member to maintain the elevation height of the movable member.

[0023] The above-mentioned grip unit may include a grip member that grips the case and a driving member that rotates the grip member.

[0024] The disassembly device for a cylindrical secondary battery according to the present invention can deform and then cut a portion of the bead portion without damaging the electrode assembly, regardless of the user's skill level. Accordingly, the user can inspect the disassembled cylindrical secondary battery and perform an accurate analysis.

[0025] Figure 1 is a perspective view illustrating a cylindrical secondary battery.

[0026] Figure 2 is a cross-sectional view illustrating the cylindrical secondary battery of Figure 1.

[0027] Figure 3 is a perspective view illustrating a cylindrical secondary battery.

[0028] Figure 4 is an exploded perspective view illustrating the cylindrical secondary battery of Figure 3.

[0029] Figure 5 is a cross-sectional view illustrating the cylindrical secondary battery of Figure 3.

[0030] FIG. 6 is a perspective view illustrating a disassembly device for a cylindrical secondary battery according to one embodiment of the present invention.

[0031] Fig. 7 is a cross-sectional view illustrating a phage unit extracted from the cylindrical secondary battery disassembly device of Fig. 6.

[0032] Fig. 8 is a plan view illustrating a disassembly device for a cylindrical secondary battery of Fig. 6.

[0033] Figure 9 is a vertical cross-sectional view showing the state before the beading unit deforms the beading section.

[0034] Figure 10 is a vertical cross-sectional view showing a state in which the moving member of the spreading unit rises and deforms the beading portion.

[0035] Figure 11 is a vertical cross-sectional view showing a state in which a cutting unit cuts a beading portion.

[0036] FIG. 12 is a perspective view illustrating a disassembly device for a cylindrical secondary battery according to another embodiment of the present invention.

[0037] Fig. 13 is a plan view illustrating a disassembly device for a cylindrical secondary battery of Fig. 12.

[0038] Figure 14 is a vertical cross-sectional view showing a state in which the cutting unit measures the distance to the deformed beading portion.

[0039] Figure 15 is a schematic diagram showing the distance measuring member, control unit, and spreading unit.

[0040] The embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art. The following embodiments may be modified in various ways, and the scope of the present invention is not limited to the embodiments described below. Rather, these embodiments are provided to more faithfully and completely explain the present disclosure and fully convey the spirit of the present invention to those skilled in the art.

[0041] In addition, in the drawings below, the thickness and size of each layer are exaggerated for convenience and clarity of explanation, and the same reference numerals in the drawings represent the same elements. As used herein, the term "and / or" includes any one and all combinations of one or more of the listed items. In addition, the meaning of "connected" in this specification means not only when member A and member B are directly connected, but also when member C is interposed between member A and member B, so that member A and member B are indirectly connected.

[0042] The terminology used herein is for the purpose of describing particular embodiments and is not intended to be limiting of the present invention. As used herein, the singular forms "a," "an," and "the" include plural forms unless the context clearly dictates otherwise. Furthermore, as used herein, the words "comprise" and "include" and / or "comprising" and "including" specify the presence of stated features, numbers, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, numbers, operations, elements, components, and / or groups thereof.

[0043] Although the terms first, second, etc. are used herein to describe various elements, components, regions, layers, and / or portions, it is to be understood that these elements, components, regions, layers, and / or portions are not limited by these terms. These terms are only used to distinguish one element, component, region, layer, or portion from another element, layer, or portion. Accordingly, a first element, component, region, layer, or portion described below may also refer to a second element, component, region, layer, or portion without departing from the teachings of the present invention.

[0044] In addition, terms related to space, such as "beneath," "below," "lower," "above," and "upper," may be used to facilitate understanding of one element or feature depicted in the drawings and other elements or features. These terms related to space are provided to facilitate understanding of the present invention in various process states or usage states, and are not intended to limit the present invention. For example, if an element or feature in the drawing is flipped, an element or feature described as "beneath" or "below" becomes "above" or "above." Therefore, "below" is a concept that encompasses "upper" or "below."

[0045] Before describing a disassembly device for a cylindrical secondary battery according to one embodiment of the present invention, a secondary battery that can be disassembled using the disassembly device for a cylindrical secondary battery will be described.

[0046] Fig. 1 is a perspective view illustrating a cylindrical secondary battery, and Fig. 2 is a cross-sectional view illustrating the cylindrical secondary battery of Fig. 1.

[0047] For convenience, the upper part is defined as the upper direction and the lower part as the lower direction based on Fig. 1 and Fig. 2, and explained.

[0048] Referring to FIGS. 1 and 2, a cylindrical secondary battery (1000) according to an embodiment of the present invention may include a cylindrical case (700), an electrode assembly (200), a positive electrode collector plate (300), and a negative electrode collector plate (400A) accommodated inside the case (700), a terminal portion (500) positioned on one side of the case (700), and a cap assembly (600) positioned on the other side of the case (700).

[0049] The case (700) may include a circular belt-shaped upper surface (710), a cylindrical body portion (720) extending from the upper surface (710), and a beading portion (730).

[0050] Since one side of the body part (720) is open, the case (700) may be formed into a cylindrical shape with one side open. The upper end of the body part (720) may be connected to the upper surface part (710). That is, the body part (720) and the upper surface part (710) may be formed as one piece.

[0051] Based on the direction shown in the drawing, the lower end of the body part (720) is open, and a cap assembly (600) is installed at the open end.

[0052] The beading portion (730) may be positioned adjacent to the lower end of the body portion (720). The beading portion (730) may be formed to be concave inward from the body portion (720). The beading portion (730) prevents the electrode assembly (200) from being detached.

[0053] The crimping portion (734) is an end portion spaced apart from the beading portion (730). The crimping portion (734) extends from the body portion (720) and is bent toward the inside of the case (700).

[0054] A cap assembly (600) may be placed between the crimping portion (734) and the beading portion (730). The crimping portion (734) secures the cap assembly (600) to seal the case (700).

[0055] A detailed description of the case (700) as described above will be provided later while describing the negative electrode collector plate (400A).

[0056] The case (700) of the above-described structure may be formed of steel, steel alloy, aluminum, aluminum alloy, or an equivalent thereof, but the material is not limited thereto. Inside the case (700), an electrode assembly (200), a positive electrode collector plate (300), and a negative electrode collector plate (400A) are accommodated together with an electrolyte.

[0057] The electrolyte allows lithium ions generated by an electrochemical reaction between the first and second electrodes within the battery to move. The electrolyte may be composed of an organic solvent, such as ethylene carbonate (EC), propylene carbonate (PC), diethyl carbonate (DEC), ethylmethyl carbonate (EMC), and / or dimethyl carbonate (DMC), and a lithium salt, such as LiPF6 or LiBF4. The electrolyte may be liquid, solid, or gel-like. Details regarding the electrolyte are as described above.

[0058] The electrode assembly (200) may be in the form of a first electrode (210), a second electrode (220), and a separator (230) interposed therebetween, rolled into a cylindrical shape. For example, the electrode assembly (200) may be rolled into the form of a jelly roll.

[0059] In this embodiment, the first electrode (210) may be an anode and the second electrode (220) may be a cathode. However, conversely, the first electrode (210) may be a cathode and the second electrode (220) may be an anode.

[0060] The first electrode (210) may be a substrate made of a thin metal plate, at least one surface of which is coated with a positive electrode active material (first active material). For example, the substrate may be aluminum (Al), and the positive electrode active material may be a transition metal oxide (LiCoO2, LiNiO2, LiMn2O4, etc.), and the details are as described above.

[0061] The edge of the first electrode (210) may have a first electrode non-coated portion (not shown), which is an area where the substrate is exposed because the positive electrode active material is not coated. In the present embodiment, the first electrode non-coated portion may be positioned toward the upper surface (710) of the case (700).

[0062] Additionally, the first electrode non-conductive portion (not shown) may protrude upward from the separator (230) and be electrically connected to the positive electrode collector plate (300). The first electrode non-conductive portion may also be referred to as a first tab, a first non-conductive portion tab, or a first substrate tab.

[0063] The second electrode (220) may be a substrate made of a thin metal plate, at least one surface of which is coated with a negative electrode active material (second active material). For example, the substrate may be copper (Cu), nickel (Ni), or an alloy of copper and nickel, and the negative electrode active material may be graphite, carbon, etc., but the details are as described above.

[0064] The edge of the second electrode (220) may have a second electrode non-coated region (not shown), which is an area where the substrate is exposed because the negative active material is not coated. In the present embodiment, the second electrode non-coated region may be positioned toward the bottom of the case (700).

[0065] Additionally, the second electrode non-conductive portion may protrude downward from the separator (230) and be electrically connected to the negative electrode collector plate (400A). A portion of the second electrode non-conductive portion may be electrically connected to the beading portion (730) of the case (700). The second electrode non-conductive portion may also be referred to as a second tab, a second non-conductive portion tab, or a second substrate tab.

[0066] The separator (230) may be polyethylene (PE) or polypropylene (PP), but the details are as described above. The separator (230) can prevent electrical shorts between the first electrode (210) and the second electrode (220) and only allow the movement of lithium ions.

[0067] The electrode assembly (200) of the above-described structure is electrically connected to the positive electrode collector plate (300) and the negative electrode collector plate (400A), and can be electrically connected to the terminal portion (500) and the case (700), respectively.

[0068] The positive electrode collector plate (300) has a circular shape and can be manufactured from the same material as the first electrode (210). For example, the positive electrode collector plate (300) can be made of aluminum or an aluminum alloy.

[0069] The positive electrode collector plate (300) may be smaller in size than the upper surface (710) of the case (700). This is to prevent the positive electrode collector plate (300) from being electrically connected to the case (700).

[0070] The positive electrode collector plate (300) can be welded with its lower surface in contact with the first electrode non-conductive portion of the first electrode (210). Accordingly, the positive electrode collector plate (300) and the first electrode (210) can be electrically connected.

[0071] Additionally, the positive electrode collector plate (300) may have its upper surface welded to the second terminal (520) of the terminal portion (500) described later. Accordingly, the positive electrode collector plate (300) and the second terminal (520) may be electrically connected.

[0072] Therefore, the first electrode (210) and the second terminal (520) can be electrically connected by the positive electrode collector plate (300). That is, the positive electrode collector plate (300) becomes a passage for current flow between the first electrode (210) and the second terminal (520).

[0073] Meanwhile, although not shown in the drawing, the positive electrode collector plate (300) may include a short-circuit prevention means (not shown) such as a fuse. The positive electrode collector plate (300) may include a central region in contact with the second terminal (520), a peripheral region surrounding the central region and in contact with the first electrode non-conductive region, and a fuse region between the central region and the peripheral region.

[0074] For example, a circular slit may be formed in a circular-shaped positive electrode collector (300) to divide a central region and a peripheral region, and the fuse portion may have a smaller cross-sectional area than the central region.

[0075] The negative electrode collector plate (400A) can be electrically connected to the second electrode (220) of the electrode assembly (200). For this purpose, the negative electrode collector plate (400A) can be made of the same material as the second electrode (220). For example, the negative electrode collector plate (400A) can be made of copper.

[0076] The negative electrode collector plate (400A) may also be electrically connected to the body portion (720) of the aforementioned case (700). A portion of the negative electrode collector plate (400A) may be welded while in contact with the second electrode non-conductive portion (not shown) of the second electrode (220). Accordingly, the negative electrode collector plate (400A) and the second electrode (220) may be electrically connected. A detailed description of the negative electrode collector plate (400A) will be provided later.

[0077] The cap assembly (600) may include a cap plate (610) for sealing the case (700) and a gasket (620) for insulating between the case (700) and the cap plate (610).

[0078] The cap plate (610) may include a flat surface (612) in the shape of a disk, a first inclined surface (616) connected to the flat surface (612), and an extension surface (614) connected to the first inclined surface (616).

[0079] The flat portion (612) may be arranged approximately parallel to the negative electrode collector plate (400A). The first inclined surface (616) may extend downwardly from the edge of the flat portion (612). The extension surface (614) may extend from the edge of the inclined surface (616) and be parallel to the flat portion (612).

[0080] The extension surface (614) may further include a second inclined surface (617) extending upwardly and a joining surface (618) extending parallel to the extension surface (614) from the second inclined surface (617).

[0081] The joining surface (618) can be placed between the beading portion (730) and the crimping portion (734) while being surrounded by a gasket (620).

[0082] Meanwhile, a notch (612a) may be on the extension surface (614). The notch (612a) may be ruptured when the pressure inside the secondary battery (1000) exceeds a certain pressure. Gas inside the secondary battery (1000) may be discharged by the rupture of the notch (612a). In other words, the notch (612a) functions as a vent.

[0083] These notches (612a) may be on one side, the other side, or both sides of the extension surface (614). Alternatively, the notches (612a) may be on one side, the other side, or both sides of the flat portion (612). In addition, there may be a plurality of notches (612a).

[0084] In another form, the cap plate (610) may not include an inclined surface (616, 617) and may be formed only of a flat surface portion (612).

[0085] The gasket (620) is positioned between the lower portion of the beading portion (730) and the crimping portion (734), and can surround the mating surface (618) of the cap plate (610). Accordingly, the gasket (620) can seal the space between the cap plate (610) and the case (700). That is, the case (700) can be sealed by the gasket (620) and the cap plate (610). The gasket (620) can surround part or all of the mating surface (618).

[0086] The side where the gasket (620) and the mating surface (618) come into contact can be defined as the inside, and the side where the gasket (620) comes into contact with the beading portion (730) can be defined as the outside. At this time, a part of the contact portion (420A) of the negative electrode collector (400A) can be inserted between the outer upper portion of the gasket (620) and the beading portion (730).

[0087] Accordingly, the contact portion (420A) of the negative electrode collector (400A) and the joining surface (618) of the cap plate (610) may not come into contact with each other due to the gasket (620). That is, the gasket (620) may mutually insulate the cap plate (610) and the case (700), and mutually insulate the cap plate (610) and the negative electrode collector (400A).

[0088] However, it is not limited thereto, and in another form, the joining surface (618) of the cap plate (610) may be in contact with the negative electrode collector (400A) or the case (700). Even in this form, the gasket (620) can perform the function of sealing the cap plate (610) and the case (700).

[0089] As described above, the positive electrode collector plate (300) and the negative electrode collector plate (400A) can be electrically connected to the electrode assembly. In addition, the positive electrode collector plate (300) can be electrically connected to the terminal portion (500) (or, the second terminal (520)). In addition, the negative electrode collector plate (400A) can be electrically connected to the case (700). Accordingly, the second terminal (520) can have a positive polarity, and the case (700) can have a negative polarity.

[0090] The terminal portion (500) may include, for example, a first terminal (510), a second terminal (520), and a first to third insulating members (530, 540, 550).

[0091] The shape of the first terminal (510) may be, for example, a circular plate. The first terminal (510) may be referred to as a terminal plate. The first terminal (510) may be arranged on the outside of the upper surface (710) of the case (700) and may be coupled to the second terminal (520). The first terminal (510) may be made of the same material as the second terminal (520). For example, the first terminal (510) may be made of aluminum or an aluminum alloy.

[0092] After the first terminal (510) and the second terminal (520) are joined, the upper surfaces of the first terminal (510) and the second terminal (520) can be arranged on the same plane. A bus bar can be electrically connected to the upper surface that is finally formed after the first terminal (510) and the second terminal (520) are joined.

[0093] The second terminal (520) may have a roughly cylindrical shape and may be referred to as a rivet terminal. The second terminal (520) may be riveted and connected to the first terminal (510) and the upper surface (710) of the case (700). The second terminal (520) may be made of the same material as the first terminal (510) and the positive electrode collector (300). For example, the second terminal (520) may be made of aluminum or an aluminum alloy.

[0094] The first terminal (510) and the second terminal (520) as described above can be insulated from the upper surface (710) of the case (700) by the first insulating member (530), the second insulating member (540), and the third insulating member (550).

[0095] The first insulating member (530) is disposed between the upper surface (710) of the case (700) and the second terminal (520) to insulate the upper surface (710) and the second terminal (520). That is, the first insulating member (530) may be disposed inside the case (700). The first insulating member (530) may have a shape corresponding to the stepped shape of the upper surface (710).

[0096] Meanwhile, an insulating cover (555) may be placed between the first insulating member (530) and the positive electrode collector plate (300).

[0097] The insulating cover (555) may be made of an electrically insulating material and may cover a portion of the upper surface of the positive electrode collector plate (300). For example, the insulating cover (555) may cover an area of ​​the upper surface of the positive electrode collector plate (300) except for the central portion that is in contact with the second terminal (520).

[0098] Additionally, the insulating cover (555) may extend from the upper surface of the positive electrode collector plate (300) to cover a portion of the side surface of the electrode assembly (200). At this time, a cut portion may be formed at the end of the insulating cover (555) so that the end of the insulating cover (555) can be easily bent along the side surface of the electrode assembly (200).

[0099] Accordingly, the insulating cover (555) can prevent the electrode assembly (200) (or the positive electrode collector) and the case (700) from being electrically connected. In one form, the insulating cover (555) may include an insulating tape, but is not limited thereto. In another form, the insulating cover (555) may include an injection-molded product in the shape of a cap or cup.

[0100] The first to third insulating members (530, 540, 550) described above may be composed of the same material or different materials. For example, the third insulating member (550) and the first insulating member (530) may include an insulating material having a higher heat-resistant temperature than the second insulating member (540). As another example, the second insulating member (540) may include an insulating material having a higher heat-resistant temperature than the first insulating member (530) and the third insulating member (550).

[0101] A manufacturing process of a cylindrical secondary battery (1000) according to one embodiment of the present invention as described above will be briefly described.

[0102] First, the upper surface (710) can be placed upward. Then, a support jig (not shown) for pressure support is installed inside the case (700), and pressure is applied from the outside of the case (700) to connect the second terminal (520) to the first terminal (510) and the case (700). Accordingly, the terminal portion (500) can be fixed to the case (700).

[0103] Next, the upper surface (710) can be placed downward. Then, the positive electrode collector plate (300), the electrode assembly (200), and the negative electrode collector plate (400A) can be inserted into the case (700). The positive electrode collector plate (300) and the electrode assembly (200) can be electrically connected to the first terminal (510).

[0104] Next, after filling the inside of the case (700) with an electrolyte, a beading portion (730) can be formed. The negative electrode collector plate (400A) can be electrically connected to the beading portion (730). Next, a cap plate (610) can be placed on the beading portion (730) via a gasket (620), and a crimping portion (734) can be created.

[0105] The detachment of the electrode assembly (200) and the negative electrode collector (400A) can be prevented by the beading portion (730). In addition, the cap assembly (600) can be fixed to the case (700) by the crimping portion (734).

[0106] According to the above-described process, the upper surface (710) of the case (700) may have a negative polarity, and the terminal portion (500) may have a positive polarity. That is, a secondary battery (1000) having both a positive electrode and a negative electrode is formed on the upper side of the case (700). The above-described process order is arbitrary, and the order of each process may be changed or performed simultaneously.

[0107] Below, a cylindrical secondary battery (1000) described above and a cylindrical secondary battery (2000, see FIG. 3) of a different form will be described.

[0108] Fig. 3 is a perspective view illustrating a cylindrical secondary battery, Fig. 4 is an exploded perspective view illustrating the cylindrical secondary battery of Fig. 3, and Fig. 5 is a cross-sectional view illustrating the cylindrical secondary battery of Fig. 3.

[0109] As illustrated in FIGS. 3 to 5, a cylindrical secondary battery (2000) includes a can (810), an electrode assembly (820), and a cap assembly (840).

[0110] The can (810) may include a circular bottom portion (811) and a cylindrical side portion (812) extending upward from the bottom portion (811) by a certain length. During the manufacturing process of the cylindrical secondary battery (2000), the top of the can (810) is open. Therefore, during the assembly process of the cylindrical secondary battery, the electrode assembly (820) may be inserted into the can (810) together with the electrolyte. For this purpose, the can (810) may include an opening.

[0111] The can (810) may include steel, a steel alloy, aluminum, an aluminum alloy, or an equivalent thereof. The can (810) may have a beading part (813) that is sunken inwardly at the bottom thereof with the cap assembly (840) as the center so that the electrode assembly (820) and the cap assembly (840) do not come off to the outside, and may have a crimping part (814) that is bent inwardly at the top thereof.

[0112] An electrode assembly (820) may be accommodated inside a can (810). The electrode assembly (820) may include a negative electrode plate (821) coated with a negative electrode active material such as graphite or carbon, a positive electrode plate (822) coated with a positive electrode active material (e.g., a transition metal oxide (LiCoO2, LiNiO2, LiMn2O4, etc.)), and a separator (823) positioned between the negative electrode plate (821) and the positive electrode plate (822) to prevent short circuiting and allow only the movement of lithium ions.

[0113] The negative electrode plate (821), the positive electrode plate (822), and the separator (823) can be wound in a roughly cylindrical shape. The negative electrode plate (821) can include copper (Cu) or nickel (Ni) foil, the positive electrode plate (822) can include aluminum (Al) foil, and the separator (823) can include polyethylene (PE) or polypropylene (PP).

[0114] A negative electrode tab (824) that protrudes downward by a certain length may be welded to the negative electrode plate (821), and a positive electrode tab (825) that protrudes upward by a certain length may be welded to the positive electrode plate (822), but the opposite is also possible. The negative electrode tab (824) may include a copper or nickel material, and the positive electrode tab (825) may include an aluminum material.

[0115] The negative tab (824) of the electrode assembly (820) can be welded to the bottom (811) of the can (810). Therefore, the can (810) can operate as a negative electrode. Of course, conversely, the positive tab (825) can be welded to the bottom (811) of the can (810), in which case the can (810) can operate as a positive electrode.

[0116] A first insulating plate (826) may be interposed between the electrode assembly (820) and the bottom portion (811). The first insulating plate (826) is coupled to the can (810) and has a first hole (826a) in the center and a second hole (826b) on the outside thereof. This first insulating plate (826) may prevent the electrode assembly (820) from electrically contacting the bottom portion (811) of the can (810).

[0117] The first insulating plate (826) can prevent the positive electrode plate (822) of the electrode assembly (820) from making electrical contact with the bottom portion (811). The first hole (826a) can allow the gas to quickly move upward through the center pin (830) when a large amount of gas is generated due to an abnormality in the cylindrical secondary battery. In addition, the negative electrode tab (824) can be welded to the bottom portion (811) by passing through the second hole (826b).

[0118] A second insulating plate (827) may be interposed between the electrode assembly (820) and the cap assembly (840). The second insulating plate (827) is coupled to the can (810) and has a first hole (827a) in the center and a plurality of second holes (827b) on the outside thereof.

[0119] This second insulating plate (827) can prevent the electrode assembly (820) from making electrical contact with the cap assembly (840). The second insulating plate (827) can limit the electrical contact of the negative electrode plate (821) of the electrode assembly (820) with the cap assembly (840).

[0120] The first hole (827a) can allow a large amount of gas to quickly move to the cap assembly (840) when a large amount of gas is generated due to an abnormality in the cylindrical secondary battery, and the second hole (827b) can allow the positive electrode tab (825) to pass through and be welded to the cap assembly (840). In addition, the remaining second hole (827b) can allow the electrolyte to quickly flow into the electrode assembly (820) during the electrolyte injection process.

[0121] Meanwhile, the diameter of each of the first hole (826a) of the first insulating plate (826) and the first hole (827a) of the second insulating plate (827) may be smaller than the diameter of the center pin (830). Accordingly, the center pin (830) can be prevented from electrically contacting the bottom portion (811) of the can (810) or the cap assembly (840) due to external impact.

[0122] The center pin (830) is a hollow, circular pipe shape and can be joined approximately at the center of the electrode assembly (820). The center pin (830) can include steel, a steel alloy, aluminum, an aluminum alloy, or polybutylene terepthalate.

[0123] This center pin (830) serves to suppress deformation of the electrode assembly (820) during charging and discharging of the battery, and acts as a passage for gas generated inside the cylindrical secondary battery. In some cases, the center pin (830) may be omitted.

[0124] A cap assembly (840) is coupled to the can (810) and seals the opening of the can (810). The cap assembly (840) includes a cap-up (841) and a safety vent (842) located at the bottom of the cap-up (841). One or more gas penetration holes (841e) may be present in the cap-up (841). These gas penetration holes (841e) may allow gases that may be generated inside the can (810) to be discharged to the outside.

[0125] In addition, the cap assembly (840) may include a connecting ring (843) positioned below the safety vent (842), a cap-down (844) positioned below the safety vent (842) and the connecting ring (843) and including a plurality of through holes (844a), and electrically connected to the positive tab (825). The cap-down (844) is positioned on the opposite side of the cap-up (841) with the safety vent (842) interposed therebetween. In addition, the cap assembly (840) may further include an insulating gasket (845).

[0126] An insulating gasket (845) insulates the cap-up (841), the safety vent (842), and the cap-down (844) from the side (812) of the can (810). This insulating gasket (845) can be substantially compressed between the beading portion (813) and the crimping portion (814) included in the side (812) of the can (810).

[0127] The through hole (841a) of the cap-up (841) and the through hole (844a) of the cap-down (844) can discharge internal gas to the outside when an abnormal internal pressure occurs inside the can (810). The internal gas inverts the safety vent (842) upward through the through hole (844a) of the cap-down (844). At this time, the safety vent (842) is electrically separated from the cap-down (844). Then, when the safety vent (842) is torn, the internal gas can be discharged to the outside through the through hole (841a) of the cap-up (841).

[0128] An electrolyte (not shown in the drawing) may be poured into the inside of the can (810), which allows lithium ions generated by an electrochemical reaction in the negative electrode plate (821) and the positive electrode plate (822) inside the battery to move during charging and discharging. This electrolyte may include a non-aqueous organic electrolyte that is a mixture of a lithium salt and a high-purity organic solvent. The electrolyte may include a polymer or solid electrolyte using a polymer electrolyte.

[0129] A cylindrical secondary battery disassembly device (100A) according to one embodiment of the present invention is a device used to disassemble the cylindrical secondary battery (1000, 2000) described above. The cylindrical secondary battery disassembly device (100A) according to one embodiment of the present invention can disassemble various cylindrical secondary batteries including a beading portion in addition to the cylindrical secondary battery (1000, 2000) having the structure described above.

[0130] Hereinafter, a cylindrical secondary battery disassembly device (100A, see FIG. 6) according to one embodiment of the present invention will be described in detail with reference to the drawings.

[0131] Meanwhile, for convenience of explanation, a disassembly device (100A) for a cylindrical secondary battery according to one embodiment of the present invention will be described assuming that it disassembles the cylindrical secondary battery (1000) described above.

[0132] FIG. 6 is a perspective view illustrating a disassembly device for a cylindrical secondary battery according to one embodiment of the present invention, FIG. 7 is a cross-sectional view illustrating a gripping unit extracted from the disassembly device for a cylindrical secondary battery of FIG. 6, FIG. 8 is a plan view illustrating the disassembly device for a cylindrical secondary battery of FIG. 6, and FIG. 9 is a vertical cross-sectional view illustrating a state before the spreading unit deforms the beading portion.

[0133] Referring to FIGS. 6 to 9, a disassembly device (100A) for a cylindrical secondary battery according to one embodiment of the present invention may include a stage (110), a gripping unit (120), a spreading unit (130), and a cutting unit (140).

[0134] The stage (110) can be positioned on the ground or a table. A gripping unit (120), a spreading unit (130), and a cutting unit (140) to be described later can be installed on the stage (110). The stage (110) can be in a block shape or a flat plate shape, but is not limited thereto.

[0135] The gripping unit (120) is installed on the stage (110) and grips the cylindrical secondary battery (1000). In addition, the gripping unit (120) rotates the cylindrical secondary battery (1000).

[0136] The above-mentioned grip unit (120) for this purpose may include, for example, a grip member (121) and a driving member (122).

[0137] The grip member (121) grips the case (700). The grip member (121) may have a shape that can accommodate the lower side of the case (700). Unlike the case illustrated in FIG. 2, the cylindrical secondary battery (1000) may be accommodated in the grip member (121) with the upper and lower sides changed so that the beading portion (730) is positioned above the second terminal (520).

[0138] This holding member (121) can be coupled to the case (700) by a forced fit. Alternatively, although not shown in the drawing, the holding member (121) includes a plurality of unit members (not shown) formed in an arc shape, and the unit members can be formed to be in close contact with the circumference of the case (700) or to be spaced apart from the case (700).

[0139] The driving member (122) rotates the gripping member (121). The driving member (122) may be installed inside the stage (110). The driving member (122) may be, for example, a rotation motor. The rotation motor may rotate the gripping member (121).

[0140] Meanwhile, a reducer (not shown) may be installed between the driving member (122) and the gripping member (121). The reducer may change the rotational speed of the gripping member (121) to be slower than the rotational speed of the rotational shaft (not shown) of the driving member (122).

[0141] The spreading unit (130) is fixed to the stage (110) and spreads and deforms the beading portion (730).

[0142] The spreading unit (130) for this purpose may include, for example, a first pillar member (131), a fixed member (132), a movable member (133), and an elevating member (134).

[0143] The first pillar member (131) is fixedly connected to the stage (110) at one end. More specifically, the first pillar member (131) is formed in a pillar shape and can be arranged in a vertical direction. The lower side of the first pillar member (131) can be fixed to the stage (110).

[0144] The fixed member (132) is installed on the first pillar member (131) and one end thereof is positioned adjacent to the beading portion (730). The fixed member (132) may be positioned at a relatively lower height than the movable member (133) described later. The end of the fixed member (132) may be in contact with the lower side of the beading portion (730) based on the direction shown in the drawing.

[0145] The shape of the fixing member (132) may be, for example, a cylindrical shape. In order to smoothly rotate the cylindrical secondary battery (1000) when the fixing member (132) is in contact with the beading portion (730), the shape of the end of the fixing member (132) may be a semicircular shape.

[0146] The above-mentioned fixing member (132) is positioned at a portion of the beading portion (730) where the electrode assembly (200) is positioned adjacent to. The fixing member (132) does not rise or fall and continues to maintain its initial position.

[0147] Accordingly, in the process of the beading portion (730) being deformed by the spreading unit (130), the deformation of the beading portion (730) at the portion where the fixing member (132) is positioned can be minimized. Accordingly, the electrode assembly (200) positioned inside the beading portion (730) can be prevented from being damaged by the deformed beading portion (730).

[0148] The movable member (133) is coupled to the first pillar member (131) so as to move along the longitudinal direction of the first pillar member (131). In addition, the movable member (133) is positioned spaced apart from the fixed member (132), and one end is positioned adjacent to the beading portion (730).

[0149] The end of the movable member (133) may be positioned adjacent to the upper side of the beading portion (730) based on the direction shown in the drawing. The shape of the movable member (133) may be, for example, a cylindrical shape.

[0150] In order to enable smooth rotation of the cylindrical secondary battery (1000) while the moving member (133) is in contact with the beading portion (730), the shape of the end of the moving member (133) may be a semicircular shape.

[0151] The lifting member (134) moves the moving member (133) so that the moving member (133) moves away from the fixed member (132) or closer to the fixed member (132).

[0152] The lifting member (134) for this purpose may include, for example, a rack gear (135) and a pinion gear (136).

[0153] The rack gear (135) may be installed inside the first column member (131) and fixedly connected to one side of the movable member (133). The pinion gear (136) may be installed inside the first column member (131) so as to mesh with the rack gear (135). The rack gear (135) may be raised or lowered according to the rotation of the pinion gear (136). The pinion gear (136) may be rotated by a motor (not shown).

[0154] Referring to Fig. 10, when the movable member (133) moves away from the fixed member (132) by the lifting member (134) as described above, the beading portion (730) in the shape of the alphabet 'U' is deformed while spreading. That is, as the distance by which the movable member (133) rises increases, the beading portion (730) can be deformed more significantly. In addition, as the degree of deformation with respect to the initial shape of the beading portion (730) increases, the innermost part of the beading portion (730) can come closer to the spreading unit (130), and the innermost part of the beading portion (730) and the cutting unit (140) to be described later can also come closer.

[0155] The above-described spreading unit (130) can automatically deform the beading portion (730) without the user having to use a separate tool. At this time, since the aforementioned gripping unit (120) rotates the cylindrical secondary battery (1000), the entire beading portion (730) can be deformed by the spreading unit (130).

[0156] In particular, since the portion adjacent to the electrode assembly (200) in the beading portion (730) has a fixed member (132) whose position does not change, deformation of the portion adjacent to the electrode assembly (200) in the beading portion (730) is prevented, and most of the remaining portion can be deformed.

[0157] The cutting unit (140) is fixed to the stage (110), installed adjacent to the spreading unit (130), and cuts the deformed beading portion (730).

[0158] The cutting unit (140) for this purpose may include, for example, a second pillar member (141) and a cutting member (142).

[0159] The second pillar member (141) is fixedly connected to the stage (110) at one end. More specifically, the second pillar member (141) is formed in a pillar shape and can be arranged in a vertical direction. The lower side of the second pillar member (141) can be fixed to the stage (110).

[0160] The cutting member (142) is fixedly connected to the second pillar member (141) and is positioned adjacent to the beading portion (730) to cut the beading portion (730) deformed by the spreading unit (130).

[0161] This cutting member (142) can be installed orthogonally to the second pillar member (141). The cutting member (142) can be, for example, a blade.

[0162] As illustrated in Fig. 11, during the process of the beading portion (730) being deformed by the spreading unit (130), the innermost part of the beading portion (730) may be brought closer to the cutting unit (140). That is, the cutting unit (140) is not moved to the beading portion (730) by a separate driving device, but rather, the cutting may be performed while the beading portion (730) is naturally deformed by the spreading unit (130) and comes into contact with the cutting unit (140).

[0163] Meanwhile, a cylindrical secondary battery disassembly device having a separate driving device installed instead of the above structure to precisely control the movement of a blade used for cutting a secondary battery, or an elastic device with a complex structure installed on the blade to control the depth at which the blade cuts the bead portion, can transmit the pressure generated during the secondary battery cutting process to the driving device. In addition, as the secondary battery is repeatedly cut by the blade, the elastic force of the elastic device weakens, allowing the blade to penetrate the bead portion and cut the electrode assembly.

[0164] On the other hand, as described above, the cutting unit (140) included in the cylindrical secondary battery disassembly device (100A) according to one embodiment of the present invention, unlike conventional disassembly devices, does not have a part that is moved by a separate driving device, and can prevent the phenomenon of damage in advance even if stress is applied to the cutting unit (140).

[0165] FIG. 12 is a perspective view illustrating a disassembly device for a cylindrical secondary battery according to another embodiment of the present invention, FIG. 13 is a plan view illustrating the disassembly device for a cylindrical secondary battery of FIG. 12, FIG. 14 is a vertical cross-sectional view illustrating a state in which a cutting unit measures a distance to a deformed beading portion, and FIG. 15 is a configuration diagram illustrating an extract of a distance measuring member, a control unit, and a spreading unit.

[0166] Referring to FIGS. 12 to 15, a disassembly device (100B) for a cylindrical secondary battery according to another embodiment of the present invention may further include a distance measuring unit (150).

[0167] A distance measuring unit (150) is installed on the stage (110) and measures the distance (L) to the portion deformed by the spreading unit (130). The distance measuring unit (150) may be positioned between the spreading unit (130) and the cutting unit (140).

[0168] Meanwhile, the distance measuring unit (150) may include, for example, a third pillar member (151), a distance measuring member (152), and a control unit (153).

[0169] The third pillar member (151) is fixedly connected to the stage (110) on one side. The third pillar member (151) is formed in a pillar shape and can be arranged in a vertical direction. The lower side of the third pillar member (151) can be fixed to the stage (110).

[0170] The distance measuring member (152) is fixedly connected to the third pillar member (151) and measures the distance to the beading portion (730). The distance measuring member (152) may be a distance measuring sensor that can be operated in various ways, such as a laser method or an ultrasonic method, for example.

[0171] This distance measuring member (152) may be positioned at a height facing the beading portion (730) of the third pillar member (151). In addition, the distance measuring member (152) may be positioned at the same height as the cutting member (142) described above.

[0172] The control unit (153) varies the movement distance of the moving member (133) of the spreading unit (130) based on the distance value measured by the distance measuring member (152).

[0173] When the distance value measured by the distance measuring member (152) exceeds the target distance value, the control unit (153) controls the lifting member (134) to increase the elevation height of the moving member (133).

[0174] When the distance value measured by the distance measuring member (152) is a target distance value, the control unit (153) controls the lifting member (134) to maintain the elevation height of the moving member (133).

[0175] Here, the target distance value is the length of the cutting member (142) described above. That is, the control unit (153) continuously increases the elevation height of the moving member (133) until the distance value measured by the distance measuring member (152) becomes equal to the length of the cutting member (142), which is the target distance value.

[0176] The operation process of the disassembly device (100B) for a cylindrical secondary battery according to another embodiment of the present invention will be described in detail. The cylindrical secondary battery (1000) is gripped by the gripping unit (120). Next, the gripping unit (120) rotates the cylindrical secondary battery (1000). Then, the spreading unit (130) spreads and deforms the beading portion (730).

[0177] At this time, it may also be possible for the grip unit (120) to rotate the cylindrical secondary battery (1000) immediately after the spreading unit (130) spreads and deforms the beading portion (730) while the grip unit (120) does not rotate the cylindrical secondary battery (1000).

[0178] Next, the elevating member (134) elevates the movable member (133) by a certain height at a reference time interval. For example, the elevating member (134) can elevate the movable member (133) by 1 mm per second, which is the reference time interval. Accordingly, the beading portion (730) can be slowly deformed.

[0179] Next, the distance measuring unit (150) measures the distance (L) to the beading unit (730). The control unit (153) controls the elevating member (134) to continuously elevate the moving member (133) until the distance value measured by the distance measuring member (152) becomes equal to the length of the cutting member (142).

[0180] Finally, when the distance value measured by the distance measuring member (152) becomes the target distance value, the control unit (153) stops the rising of the moving member (133), and the cutting unit (140) naturally comes into contact with the deformed beading part (730), so that the beading part (730) can be cut.

[0181] As described above, the cylindrical secondary battery disassembly device (100B) according to another embodiment of the present invention, unlike conventional disassembly devices, can deform and then cut a portion of the beading portion (730) regardless of the user's skill level. Accordingly, accurate analysis can be performed on the cylindrical secondary battery (1000) without damaging the electrode assembly (200).

[0182] Although various embodiments of the present invention have been described above, the drawings and detailed description of the invention described so far are merely exemplary of the present invention, and are used solely for the purpose of explaining the present invention and are not intended to limit the meaning or scope of the present invention as set forth in the claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible from the present invention. Accordingly, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

[0183] - Explanation of symbols -

[0184] 100A, 100B: Disassembly device for cylindrical secondary batteries

[0185] 110: Stage 120: Phage Unit

[0186] 121: Gripper member 122: Drive member

[0187] 130: Spreading unit 131: First column member

[0188] 132: Fixed member 133: Movable member

[0189] 134: Elevating member 140: Cutting unit

[0190] 141: Second column member 142: Cutting member

[0191] 150: Distance measuring unit 151: Third column member

[0192] 152: Distance measuring member 153: Control unit

Claims

1. A disassembly device for a cylindrical secondary battery used for disassembling a cylindrical secondary battery including an electrode assembly and a case that accommodates the electrode assembly and includes a beading portion inserted to a certain depth, stage; A gripping unit installed on the stage, gripping the cylindrical secondary battery, and rotating the cylindrical secondary battery; A spreading unit fixed to the stage and deforming the beading portion by spreading it; and A cylindrical secondary battery disassembly device comprising a cutting unit fixed to the stage, installed adjacent to the spreading unit, and cutting the deformed beading portion.

2. In paragraph 1, The above-mentioned spreading unit is, A first pillar member having one side fixedly connected to the stage; A fixing member installed on the first pillar member and having one end positioned adjacent to the beading portion; A movable member coupled to the first column member so as to move along the longitudinal direction of the first column member, positioned apart from the fixed member, and having one end positioned adjacent to the beading portion; and A disassembly device for a cylindrical secondary battery, comprising: an elevating member for moving the movable member so that the movable member moves away from or closer to the fixed member.

3. In paragraph 2, The above-mentioned lifting member is a cylindrical secondary battery disassembly device that lifts and lowers the above-mentioned moving member by a certain height at a standard time interval.

4. In paragraph 2, The above lifting member is, A rack gear installed inside the first pillar member and fixedly connected to one side of the movable member; and A cylindrical secondary battery disassembly device comprising a pinion gear installed inside the first pillar member to mesh with the rack gear and raise or lower the rack gear.

5. In paragraph 1, The above cutting unit, A second pillar member having one side fixedly connected to the stage; and A cylindrical secondary battery disassembly device comprising a cutting member fixedly connected to the second pillar member and positioned adjacent to the beading portion to cut the beading portion deformed by the spreading unit.

6. In paragraph 2, A disassembly device for a cylindrical secondary battery, further comprising a distance measuring unit installed on the stage and measuring a distance to a portion deformed by the spreading unit.

7. In paragraph 6, The above distance measuring unit is, A third pillar member having one side fixedly connected to the stage; A distance measuring member fixedly connected to the third pillar member and measuring the distance to the beading portion; and A disassembly device for a cylindrical secondary battery, comprising a control unit for varying the moving distance of the moving member based on the distance value measured by the distance measuring member.

8. In paragraph 7, A cylindrical secondary battery disassembly device wherein the distance measuring unit is positioned between the spreading unit and the cutting unit.

9. In paragraph 7, If the distance value measured from the above distance measuring member exceeds the target distance value, A cylindrical secondary battery disassembly device in which the control unit controls the lifting member to increase the lifting height of the movable member.

10. In paragraph 7, If the distance value measured from the above distance measuring member is the target distance value, A cylindrical secondary battery disassembly device in which the control unit controls the lifting member to maintain the elevation height of the moving member.

11. In paragraph 1, The above-mentioned phage unit, A grip member for gripping the above case; and A disassembly device for a cylindrical secondary battery, comprising a driving member that rotates the above-mentioned phage member.

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