Secondary battery and method of manufacturing secondary battery

Abstract

The present disclosure relates to a secondary battery and a method for manufacturing a secondary battery. An electrode assembly formed by stacking a first electrode, a separator, and a second electrode according to the present disclosure, a case for housing the electrode assembly, a detachable member attached integrally with a first surface of the case, and a packaging member disposed on a second surface of the case opposite to the first surface, wherein the detachable member may include at least one detachable portion that is coupled to a fitting portion of a device.

Description

Technology Field

[0001] The present disclosure relates to a secondary battery and a method for manufacturing a secondary battery. Background Technology

[0002] Unlike primary batteries, which cannot be recharged, secondary batteries are batteries capable of both charging and discharging. Low-capacity secondary batteries are used in small portable electronic devices such as smartphones, feature phones, laptop computers, digital cameras, and camcorders, while high-capacity secondary batteries are widely used as power sources for motor drive systems and power storage batteries in hybrid and electric vehicles. Such secondary batteries include an electrode assembly consisting of a positive electrode and a negative electrode, a case housing the assembly, and electrode terminals connected to the electrode assembly.

[0003] For small electronic devices such as smartphones, pouch-type batteries, which are highly flexible and relatively lightweight, are widely used due to changes in component layout design and the demand for lightweighting following the launch of new models. However, pouch-type batteries using highly flexible composite materials have a problem in that wrinkles or deformation occur on the exterior of the pouch when the battery is replaced after being installed in the battery placement space. Consequently, prismatic cases using stainless steel, which has higher strength than conventional aluminum, have been proposed for small electronic device batteries; however, to form a stainless steel prismatic case without defects, the thickness of the stainless steel material must be at least 100 µm, which leads to an increase in battery weight. Therefore, there is a need to develop a secondary battery that is easy to replace while utilizing lightweight pouch-type batteries.

[0004] The information described above disclosed in the background technology of this invention is intended only to enhance understanding of the background of the present invention and may therefore include information that does not constitute prior art. The problem to be solved

[0005] The problem that the present invention aims to solve is to provide a secondary battery and a method for manufacturing a secondary battery to solve the above technical problem.

[0006] However, the technical problems that the present invention aims to solve are not limited to those described above, and other unmentioned problems can be clearly understood by those skilled in the art from the description of the invention below. means of solving the problem

[0007] A secondary battery according to one embodiment of the present invention for solving the above technical problem comprises an electrode assembly formed by stacking a first electrode, a separator, and a second electrode, a case for housing the electrode assembly, a detachable member attached integrally with a first surface of the case, and a packaging member disposed on a second surface of the case opposite to the first surface, wherein the detachable member may include at least one detachable part coupled to a fitting part of a device.

[0008] According to one embodiment of the present disclosure, the detachable member includes a bonding surface in contact with a first surface and a detachable surface opposite to the bonding surface, and the detachable portion includes a side wall portion formed on the detachable surface along at least a portion of the perimeter of the detachable member, and the side wall portion may protrude from the detachable surface.

[0009] According to one embodiment of the present disclosure, the sidewall portion includes a first sidewall and a second sidewall facing each other, and at least one of the first sidewall or the second sidewall may include a hook that is detachably attached to a fitting portion.

[0010] According to one embodiment of the present disclosure, the detachable portion may include a fitting portion and a detachable groove.

[0011] According to one embodiment of the present disclosure, the detachable member may include an elastic member.

[0012] According to one embodiment of the present disclosure, the fitting part or the detachable member may be magnetic.

[0013] According to one embodiment of the present disclosure, a magnetic body may be located around a fitting part or a detachable member.

[0014] According to one embodiment of the present disclosure, the fitting portion includes a first magnetic body and a second magnetic body, and the first magnetic body and the second magnetic body may have different poles.

[0015] According to one embodiment of the present disclosure, the packaging member may include a handle for removal from the case.

[0016] According to one embodiment of the present disclosure, an adhesive layer may be interposed between the packaging member and the case.

[0017] According to one embodiment of the present disclosure, the flat surface of the packaging member may correspond to the shape of the second surface of the case.

[0018] According to one embodiment of the present disclosure, the packaging member may include a flame-retardant material.

[0019] According to one embodiment of the present disclosure, the plane of the detachable member may correspond to the shape of the first surface of the case.

[0020] A secondary battery according to one embodiment of the present disclosure may further include a terminal portion electrically connected to an electrode assembly and a protection circuit member electrically connected to the terminal portion.

[0021] A method for manufacturing a secondary battery according to one embodiment of the present disclosure for solving a technical problem comprises the steps of: forming an electrode assembly by stacking a first electrode, a separator, and a second electrode; inserting the electrode assembly into a case; attaching a detachable member to a first surface of the case; and placing a packaging member on a second surface of the case opposite to the first surface, wherein the detachable member may include at least one detachable part that is detachable from a fitting part of a device.

[0022] According to one embodiment of the present disclosure, the step of placing a packaging member on a second surface of a case may include the step of interposing an adhesive layer between the packaging member and the case.

[0023] A method for manufacturing a secondary battery according to one embodiment of the present disclosure may further include the step of forming a terminal portion electrically connected to an electrode assembly and a protection circuit member electrically connected to the terminal portion. Effects of the invention

[0024] According to some embodiments of the present invention, a secondary battery can be provided that is configured to be easily attached to or replaced by a device while using a pouch-type battery that has excellent flexibility and is relatively light in weight to meet the requirements for lightweighting.

[0025] According to some embodiments of the present invention, a secondary battery capable of inducing easy coupling and orientation can be provided so that the user does not have difficulty attaching or detaching it directly to a device.

[0026] However, the effects obtainable through the present invention are not limited to those described above, and other unmentioned technical effects will be clearly understood by those skilled in the art from the description of the invention below. Brief explanation of the drawing

[0027] The following drawings attached to this specification illustrate preferred embodiments of the present invention and serve to further enhance understanding of the technical concept of the present invention together with the detailed description of the invention provided below; therefore, the present invention should not be interpreted as being limited only to the matters described in such drawings. FIG. 1 is an exploded perspective view illustrating the structure of a secondary battery according to one embodiment of the present invention. FIG. 2 is a drawing showing a case of a secondary battery and an electrode assembly housed inside the case according to one embodiment of the present invention. FIG. 3 is a cross-sectional view illustrating a secondary battery according to one embodiment of the present invention coupled to a device. FIG. 4 is a schematic diagram of a secondary battery according to one embodiment of the present invention. FIG. 5 is a schematic diagram of a secondary battery according to one embodiment of the present invention. FIG. 6 is a schematic diagram of a secondary battery according to one embodiment of the present invention. FIG. 7 is a cross-sectional view illustrating a secondary battery according to one embodiment of the present invention coupled to a device. FIG. 8 is a cross-sectional view illustrating a secondary battery according to one embodiment of the present invention coupled to a device. FIG. 9 is a schematic diagram of a secondary battery according to one embodiment of the present invention. FIG. 10 is a flowchart illustrating a method for manufacturing a secondary battery according to the present disclosure. Specific details for implementing the invention

[0028] Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings. Prior to this, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings. Instead, based on the principle that the inventor can appropriately define the concepts of terms to best describe their invention, they should be interpreted in a meaning and concept consistent with the technical spirit of the present invention. Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are merely some of the most preferred embodiments of the present invention and do not represent all of the technical spirit of the present invention. It should be understood that various equivalents and modifications capable of replacing them may exist at the time of filing this application.

[0029] Additionally, as used herein, “comprise, include” and / or “comprising, including” specify the presence of the mentioned features, numbers, steps, actions, parts, elements, and / or groups thereof, and do not exclude the presence or addition of one or more other features, numbers, actions, parts, elements, and / or groups.

[0030] Additionally, to aid in understanding the invention, the attached drawings are not drawn to actual scale, and the dimensions of some components may be exaggerated. Furthermore, the same reference numerals may be assigned to identical components in different embodiments.

[0031] The statement that two subjects of comparison are 'identical' means that they are 'substantially identical'. Therefore, substantial identity may include deviations considered low in the industry, for example, deviations within 5%. Additionally, the statement that a parameter is uniform in a given area may mean that it is uniform from an average perspective.

[0032] Although terms such as "first," "second," etc., are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are used merely to distinguish one component from another, and unless specifically stated otherwise, the first component may also be the second component.

[0033] Throughout the specification, unless specifically stated otherwise, each component may be singular or plural.

[0034] The statement that any component is positioned on the "upper (or lower) side" or the "upper (or lower) side" of a component implies not only that any component is positioned in contact with the upper (or lower) surface of said component, but also that another component may be interposed between said component and any component positioned on (or below) said component. Additionally, the area between the upper and lower parts of a component depicted in the drawings, or the remaining part excluding the upper and lower parts, may be referred to as a "side" or "lateral side." Furthermore, the direction facing the internal space of the component may be referred to as the "inner side," and the direction protruding into the open external space may be referred to as the "outer side." Such relative terms, such as "upper" and "upper side," may be used to describe the relationship between components depicted in the drawings, and the present disclosure is not limited by such terms.

[0035] Spatial relative terms such as "beneath," "below," "lower," "above," and "upper" may be used herein for ease of explanation to describe the relationship between one element or feature and another element(s) or feature(s) as illustrated in the drawings. Spatially relative positions are to be understood as encompassing different orientations of the device in use or operation, in addition to the orientations depicted in the figures. For example, if the device in the drawing is inverted, an element described as "below" or "below" is understood as "above" or "upper" of another element. Thus, the term "below" may encompass both the up and down directions.

[0036] Furthermore, where one component is described as being "on," "connected to," or "coupled to" another component, it should be understood that while the components may be directly connected or coupled to each other, another component may be "interposed" between each component, or that each component may be "connected," "coupled," or "coupled" through another component.

[0037] As used herein, the term “and / or” includes any and all combinations of one or more of the associated listed items. Additionally, the use of “may” when describing embodiments of the present disclosure relates to “one or more embodiments of the present disclosure.” Expressions such as “one or more” preceding a list of elements modify the entire list of elements and do not modify individual elements of the list.

[0038] Throughout the specification, "A and / or B" means A, B, or A and B unless specifically stated otherwise, and "C to D" means C or more and D or less, unless specifically stated otherwise.

[0039] In this specification, terms such as first, second, third, etc. may be used to describe various elements, components, regions, layers, and / or sections, but these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms are used to distinguish one element, component, region, layer, or section from another element, component, region, layer, or section. Accordingly, the first element, component, region, layer, or section discussed below may be named the second element, component, region, layer, or section without departing from the teachings of the exemplary embodiments.

[0040] The terms used in this specification are intended to describe embodiments of the present disclosure and are not intended to limit the present disclosure.

[0041] FIG. 1 is an exploded perspective view illustrating the structure of a secondary battery according to one embodiment of the present invention.

[0042] Referring to FIG. 1, a secondary battery (100) according to one embodiment of the present invention may include an electrode assembly (not shown) formed by stacking a first electrode, a separator, and a second electrode, and a case (120) that accommodates the electrode assembly. For example, the secondary battery (100) may be a pouch-type secondary battery. The electrode assembly and the case (120) that accommodates the electrode assembly will be described later in FIG. 2.

[0043] A secondary battery (100) according to one embodiment of the present invention may include a detachable member (130) attached to a first surface (121) of a case (120) and a packaging member (140) disposed on a second surface (122) of the case (120). Here, the second surface (122) of the case (120) may face the first surface (121) of the case (120).

[0044] In one embodiment, the detachable member (130) may include at least one detachable part (132) that is coupled to a fitting part of the device. For example, the detachable part (132) may be formed integrally with the detachable member (130), and a material having excellent strength may be used to provide support when coupled to a fitting part of the device. For example, the detachable member (130) may include engineering plastics such as polycarbonate, polyoxymethylene, polybutylene terephthalate, high-strength ceramic, metal, or a combination thereof.

[0045] Specifically, the detachable member (130) may include a bonding surface (136) in contact with the first surface (121) of the case (120) and a detachable surface (134) facing the bonding surface (136). A detachable portion (132) may be formed on the detachable surface (134) along at least a portion of the perimeter of the detachable member (130). The shape of the detachable portion (132) may vary in correspondence with the shape of the fitting portion of the device. For example, the detachable portion (132) may include a side wall portion protruding from the detachable surface (134). Various shapes of the detachable member (130) including the detachable portion (132) will be described later in FIGS. 3 to 8.

[0046] In one embodiment, the detachable member (130) may be attached integrally with the first surface (121) of the case (120). Specifically, an adhesive layer (not shown) may be interposed between the first surface (121) of the case (120) and the detachable member (130). Here, the adhesive layer may correspond to any one of the insulating materials having adhesive properties used in the industry. For example, the adhesive layer may include polyimide tape, acrylic adhesive, epoxy adhesive, polyurethane film, silicone adhesive, or a combination thereof.

[0047] According to one embodiment of the present disclosure, the plane of the detachable member (130) may correspond to the shape of the first surface (121) of the case (120). Specifically, the bonding surface (136) of the detachable member (130) corresponds to the shape of the first surface (121) of the case (120), so that the detachable member (130) can cover the entire first surface (121) of the case (120).

[0048] Additionally, according to one embodiment of the present disclosure, the flat surface of the packaging member (140) may correspond to the shape of the second surface (122) of the case (120). For example, the packaging member (140) may have an area greater than or equal to the second surface (122) of the case (120), and the packaging member (140) may cover the entire second surface (122) of the case (120).

[0049] According to one embodiment, the packaging member (140) may include a handle (142) for removal from the case (120). After attaching the secondary battery (100) to which the packaging member (140) is attached to the device via the detachable member (130), the user can easily remove the packaging member (140) using the handle (142) of the packaging member (140) to expose the case (120). Additionally, to facilitate removal, in one embodiment, an adhesive layer (170) may be interposed between the packaging member (140) and the case (120). For example, the adhesive layer (170) may correspond to a low-adhesion adhesive layer. When using a low-adhesion adhesive layer, the user can remove the packaging member (140) from the case (120) without a separate tool.

[0050] A secondary battery (100) according to one embodiment of the present disclosure may further include a terminal portion (150) electrically connected to an electrode assembly. The terminal portion (150) may perform the function of electrically connecting the electrode assembly to an external circuit. For example, the terminal portion (150) may be a tab or lead connected to the positive and negative electrodes of the electrode assembly, respectively, and exposed to the outside of the case (120).

[0051] A secondary battery (100) according to one embodiment of the present disclosure may further include a protection circuit member (160) electrically connected to a terminal portion (150). For example, the protection circuit member (160) may be electrically connected to the terminal portion (150) by making contact with each other. Alternatively, the protection circuit member (160) may be electrically connected to the terminal portion (150) through a conductor. The protection circuit member (160) may block or control the flow of current in the event of an abnormal state for the safe operation of the secondary battery (100). The protection circuit member (160) may include an overcharge prevention circuit, an over-discharge prevention circuit, an overcurrent prevention circuit, or a temperature sensing circuit. For example, the protection circuit member (160) may be configured such that a protection element, such as a fuse or a thermistor, is combined in a PCB form as needed.

[0052] In one embodiment, the terminal portion (150) and the protection circuit member (160) may be installed together on one side of the case (120). The side of the case (120) on which the terminal portion (150) and the protection circuit member (160) are installed may be at a different location from the first side (121) on which the detachable member (130) is installed or the second side (122) on which the packaging member (140) is installed. Specifically, the detachable member (130) or the packaging member (140) may be installed so as to be spaced apart from the terminal portion (150) and the protection circuit member (160).

[0053] Alternatively, a secondary battery (100_1) according to one embodiment of the present invention may include an electrode assembly (not shown) formed by stacking a first electrode, a separator, and a second electrode, and a case (120_1) that accommodates the electrode assembly. A description of the configuration of the secondary battery (100_1) according to one embodiment that corresponds to the secondary battery (100) according to the aforementioned other embodiment is omitted.

[0054] A secondary battery (100_1) according to one embodiment may include a detachable member (130_1) attached to a second surface (122_2) of a case (120_1). At this time, a packaging member (140_1) may be placed on the second surface (122_1) of the case (120_) before the detachable member (130_1) is attached. An adhesive layer (170_1) may be interposed between the packaging member (140_1) and the case (120_1). Accordingly, the packaging member (140_1) may be removed using a handle (142_1) before the detachable member (130_1) is attached to the second surface (122_2) of the case (120_1). Subsequently, the detachable member (130_1) may be attached to the case (120_1) using the exposed adhesive layer (170_1). Here, the first surface (121_1) of the case (120_1) facing the second surface (122_2) of the case (120_1) may be exposed to the outside.

[0055] According to some embodiments of the present invention, a secondary battery can be provided that is configured to be easily attached to or replaced by a device while using a pouch-type battery that has excellent flexibility and is relatively light in weight to meet the requirements for lightweighting.

[0056] FIG. 2 is a drawing showing a case of a secondary battery and an electrode assembly housed inside the case according to one embodiment of the present invention.

[0057] Referring to FIG. 2, a secondary battery according to one embodiment may include an electrode assembly (210, 210_1) and a case (220) that accommodates the electrode assembly (210, 210_1). The electrode assembly (210, 210_1) may include a first electrode (212, 212_1), a second electrode (214, 214_1), and a separator (216, 216_1) interposed between the first electrode (212, 212_1) and the second electrode (214, 214_1). Specifically, the electrode assembly (210, 210_1) may be formed by winding or stacking a laminate of the first electrode (212, 212_1), the separator (216, 216_1), and the second electrode (214, 214_1), which are formed in a thin plate or film shape. In the present invention, the shape of the electrode assembly (210, 210_1) is not limited. Also, in the present invention, the number of electrode assemblies (210, 210_1) is not limited.

[0058] In one embodiment, the electrode assembly (210) may be of the wound type. Also, in one embodiment, the electrode assembly (210_1) may be of the stack type. For example, the electrode assembly (210_1) may be a Z-stack electrode assembly in which a first electrode (212_1) and a second electrode (214_1) are inserted on both sides of a separator (216_1) that is folded into a Z-stack. Additionally, one or more electrode assemblies (210_1) may be stacked so that their long sides are adjacent to each other and housed inside a case (220).

[0059] In one embodiment, the first electrode (212, 212_1) may be an electrode corresponding to the positive or negative electrode in the electrode assembly (210, 210_1). The second electrode (214, 214_1) may be an electrode corresponding to the opposite electrode to the first electrode (212, 212_1). For example, if the first electrode (212, 212_1) is a positive electrode, the second electrode (214, 214_1) may be a negative electrode. Conversely, if the first electrode (212, 212_1) is a negative electrode, the second electrode (214, 214_1) may be a positive electrode.

[0060] In one embodiment, when the first electrode (212, 212_1) is an anode, the first electrode (212, 212_1) may be formed of a metal foil such as aluminum or an aluminum alloy. In another embodiment, when the first electrode (212, 212_1) is a cathode, the first electrode (212, 212_1) may be formed of a metal foil such as copper, a copper alloy, nickel, or a nickel alloy. The second electrode (214, 214_1) is also the same as above.

[0061] In one embodiment, the first electrode (212, 212_1) is formed by applying a first electrode active material, such as graphite or carbon, to a current collector formed of a metal foil such as copper, a copper alloy, nickel, or a nickel alloy, and may include a first electrode tab (212a, 212a_1) connected to a non-coated area, which is an area where the first electrode active material is not applied. The first electrode tab (212a, 212a_1) may serve as a passage for current flow between the first electrode (212, 212_1) and the terminal portion (250). In some examples, the first electrode tab (212a, 212a_1) may be formed by cutting it to protrude to one side in advance when manufacturing the first electrode (212, 212_1), and may protrude further to one side than the separator (216, 216_1) without separate cutting.

[0062] The second electrode (214, 214_1) is formed by applying a second electrode active material, such as a transition metal oxide, to a current collector formed of a metal foil such as aluminum or an aluminum alloy, and may include a second electrode tab (214a, 214a_1) connected to a non-coated area, which is an area where the second electrode active material is not applied. The second electrode tab (214a, 214a_1) may serve as a passage for current flow between the second electrode (214, 214_1) and the terminal portion (250). In some examples, the second electrode tab (214a, 214a_1) may be formed by cutting it to protrude to the other side in advance when manufacturing the second electrode (214, 214_1), and may protrude further to the other side than the separator (216, 216_1) without separate cutting.

[0063] In one embodiment, the electrode assembly (210, 210_1) may be housed in a case (220) together with an electrolyte. A terminal portion (250) may be disposed in the case (220) to electrically connect the electrode assembly (210, 210_1) and the outside of the case (220). The terminal portion (250) may include a first electrode terminal (252) connected to a first electrode (212, 212_1) and a second electrode terminal (254) connected to a second electrode (214, 214_1).

[0064] In FIG. 2, the first electrode terminal (252) and the second electrode terminal (254) are shown as being located on the same side of the case (220), but are not limited thereto. The first electrode terminal (252) and the second electrode terminal (254) may be partially coated with an insulator (256) to be insulated from the case (220). Through the insulator (256), the electrode assembly (210, 210_1) and the case (220) can be electrically insulated from each other despite the presence of the terminal portion (250).

[0065] FIG. 3 is a cross-sectional view illustrating a secondary battery according to one embodiment of the present invention coupled to a device.

[0066] Referring to FIG. 3, a secondary battery (300) according to one embodiment of the present disclosure may include a case (320) in which an electrode assembly is housed, a detachable member (330) attached integrally with one surface of the case (320), and a packaging member (340).

[0067] In one embodiment, the detachable member (330) may include at least one detachable portion that is coupled to the fitting portion (392) of the device (390). Specifically, the detachable portion may include a side wall portion (334) formed along at least a portion of the perimeter of the detachable member (330).

[0068] In one embodiment, the sidewall portion (334) may include two sidewalls facing each other. Additionally, the sidewall may include a hook (336) that is detachable from the fitting portion (392) of the device (390). Specifically, the device (390) may collectively refer to an electronic device powered by a secondary battery (300). For example, the device (390) may include a mobile phone, a car, a watch, or various other types of electronic devices.

[0069] The fitting portion (392) of the device (390) is configured to secure the detachable member (330) of the secondary battery (300) and may correspond to the shape of the detachable member (330). In one embodiment, the fitting portion (392) of the device (390) may include a groove and a relatively protruding protrusion that are formed in a shape corresponding to the hook (336) included in the detachable member (330). Additionally, according to one embodiment, the detachable member (330) may include a groove (338) that is detachable from the fitting portion (392). Specifically, the detachable member (330) may include a groove (338) that is fitted in correspondence with the relatively protruding protrusion from the fitting portion (392).

[0070] The shape of the detachable member (330) and the shape of the fitting part (392) of the device (390) of the present invention are not limited to the shapes disclosed above and may include shapes commonly used in the industry for mechanically joining two different rigid bodies.

[0071] Other details regarding the configuration are as described above with reference to FIGS. 1 and FIGS. 2.

[0072] FIG. 4 is a schematic diagram of a secondary battery according to one embodiment of the present invention.

[0073] Referring to FIG. 4, a secondary battery according to one embodiment of the present disclosure may include a case (420) in which an electrode assembly is housed, a detachable member (430) attached integrally with one side of the case (420), and a packaging member (440) attached to the other side of the case (420).

[0074] In one embodiment, the detachable member (430) may include a side wall portion (434) formed along at least a portion of the perimeter of the detachable member (430). Here, the side wall portion (434) may include a first side wall (434_1) and a second side wall (434_2) facing each other. Specifically, the first side wall (434_1) and the second side wall (434_2) may be formed to extend along the perimeter of the side of the detachable member (430) where the case (420) is not attached (the detachable surface of FIG. 1).

[0075] In one embodiment, at least one of the first side wall (434_1) or the second side wall (434_2) may include a hook or a groove that is detachably attached to the fitting portion of the device. For example, the first side wall (434_1) may include a hook that is detachably attached to the fitting portion of the device with a recessed shape, and the second side wall (434_2) may include a groove that is detachably attached to the fitting portion of the device with a recessed shape. In another embodiment, the second side wall (434_2) may include a hook that is detachably attached to the fitting portion of the device with a recessed shape, and the first side wall (434_1) may include a groove that is detachably attached to the fitting portion of the device with a recessed shape.

[0076] In one embodiment, the first side wall (434_1) and the second side wall (434_2) may include a hook that is detachably attached to a fitting portion of a recessed-shaped device. In another embodiment, the first side wall (434_1) and the second side wall (434_2) may include a groove that is detachably attached to a fitting portion of a recessed-shaped device.

[0077] Other descriptions regarding the configuration are as described above with reference to FIGS. 1 to 3.

[0078] FIG. 5 is a schematic diagram of a secondary battery according to one embodiment of the present invention.

[0079] Referring to FIG. 5, a secondary battery according to one embodiment of the present disclosure may include a case (520) in which an electrode assembly is housed, a detachable member (530) attached integrally with one side of the case (520), and a packaging member (540) attached to the other side of the case (520).

[0080] In one embodiment, the detachable member (530) may include a detachable portion (532) formed along the perimeter of the detachable member (530). Here, the detachable portion (532) may include a side wall that extends along the perimeter of the side of the detachable member (530) where the case (520) is not attached (the detachable surface of FIG. 1). Here, the side wall may include a hook or groove that is detachable from the fitting portion of the device.

[0081] Other descriptions regarding the configuration are as described above with reference to FIGS. 1 to 4.

[0082] FIG. 6 is a schematic diagram of a secondary battery according to one embodiment of the present invention.

[0083] Referring to FIG. 6, a secondary battery according to one embodiment of the present disclosure may include a case (620) in which an electrode assembly is housed, a detachable member (630) attached integrally with one side of the case (620), and a packaging member (640) attached to the other side of the case (620).

[0084] In one embodiment, the detachable member (630) may include a detachable portion (632) formed along at least a portion of the perimeter of the detachable member (630). Here, the detachable portion (632) may include a protrusion formed extending from the vertex of the perimeter of the side of the detachable member (630) to which the case (620) is not attached (the detachable surface of FIG. 1). Here, the protrusion may include a hook or groove that is detachable from the fitting portion of the device.

[0085] Other descriptions regarding the configuration are as described above with reference to FIGS. 1 to 4.

[0086] FIG. 7 is a cross-sectional view illustrating a secondary battery according to one embodiment of the present invention coupled to a device.

[0087] Referring to FIG. 7, a secondary battery (700) according to one embodiment of the present disclosure may include a case (720) in which an electrode assembly is housed, a detachable member (730) attached integrally with one surface of the case (720), and a packaging member (740).

[0088] In one embodiment, the detachable member (730) may include at least one detachable part (732) that is coupled to the fitting part (792) of the device (790). Specifically, the detachable part (732) may be formed extending from at least a portion of the circumference of the detachable member (730) and may include a shape corresponding to the fitting part (792) of the device (790).

[0089] According to one embodiment of the present disclosure, the detachable member (730) may include an elastic portion (739). Here, the elastic portion (739) may refer to a part of the detachable member (730) manufactured to maintain a specific shape by bending an elastic material multiple times, as shown in FIG. 7. For example, the elastic portion (739) may be manufactured by bending it into a U-shape and processed so that it maintains the same U-shape even when deformation is applied to one end of the elastic portion (739) with a force less than a certain amount.

[0090] In one embodiment, the elastic member (739) is positioned opposite to the detachable member (732), and a groove (738) corresponding to the protruding fitting part (792) of the device (790) may be included at one end of the elastic member (739). Through this, when the detachable member (732) of the detachable member (730) is fitted into the groove of the fitting part (792), and the groove (738) of the elastic member (739) and the protrusion of the other fitting part (792) are fitted together, the secondary battery (700) can be provided with a supporting force sufficient to form an integral unit with the device (790). Subsequently, the user can separate the secondary battery (700) from the device (790) by using the deformation of the elastic member (739) according to their choice.

[0091] FIG. 8 is a cross-sectional view illustrating a secondary battery according to one embodiment of the present invention coupled to a device.

[0092] Referring to FIG. 8, a secondary battery (800) according to one embodiment of the present disclosure may include a case (820) in which an electrode assembly is housed, a detachable member (830) attached integrally with one side of the case (820), and a packaging member (840) attached to the other side of the case (820).

[0093] In one embodiment, the detachable member (830) may include at least one detachable part (832) that is coupled to the fitting part (892) of the device (890). Specifically, the detachable part (832) may be formed extending from at least a portion of the circumference of the detachable member (830) and may include a shape corresponding to the fitting part (892) of the device (890).

[0094] According to one embodiment, the fitting portion (892) may be magnetic. Also, according to one embodiment, the detachable member (830) may be magnetic. Specifically, a magnetic body may be located around the fitting portion (892) or the detachable member (830). The magnetic body located around the fitting portion (892) and the magnetic body located around the detachable member (830) may attract each other, making it easy for the fitting portion (892) and the detachable portion (832) of the detachable member (830) to be fitted together. Additionally, the fitted fitting portion (892) and the detachable member (830) may be strongly coupled to provide a supporting force sufficient to form an integral unit between the secondary battery (700) and the device (790).

[0095] According to one embodiment of the present disclosure, the fitting portion (892) includes a first magnetic body (894_1) and a second magnetic body (894_2), and the first magnetic body (894_1) and the second magnetic body (894_2) may have different poles. For example, if the first magnetic body (894_1) is the N pole, the second magnetic body (894_2) may be the S pole. In this case, a detachable portion (832) having an S pole is disposed in the fitting portion (892) containing the first magnetic body (894_1), and a detachable portion (832) having an N pole is disposed in the fitting portion (892) containing the second magnetic body (894_2), so that they can be strongly coupled to each other. Conversely, if a detachable part (832) with an N pole is disposed on a fitting part (892) containing a first magnetic body (894_1) and a detachable part (832) with an S pole is disposed on a fitting part (892) containing a second magnetic body (894_2), the detachable part (832) and the fitting part (892) are not coupled to each other, thereby allowing the user to be oriented.

[0096] FIG. 9 is a schematic diagram of a secondary battery according to one embodiment of the present invention.

[0097] Referring to FIG. 9, a secondary battery (900) according to one embodiment of the present disclosure may include a case (920) in which an electrode assembly is housed, a detachable member (930) attached integrally with one side of the case (920), a packaging member (940) attached to the other side of the case (920), a terminal portion (950) electrically connected to the electrode assembly, and a protection circuit member (960) electrically connected to the terminal portion (950).

[0098] Here, the packaging member (940) may include an extension (944) that wraps around the case (920). Specifically, as described above in FIG. 1, the plane of the packaging member (940) may correspond to the shape of the second surface of the case (920). In one embodiment, the packaging member (940) has an area greater than or equal to the second surface of the case (920) and may also cover parts other than the second surface of the case (920).

[0099] Additionally, according to one embodiment, the packaging member (940) may include a flame-retardant material. Specifically, the packaging member (940) may include flame-retardant paper, flame-retardant styrofoam, flame-retardant plastics such as ABS and PVC, flame-retardant fibers including aramid, ceramic coated paper including silica or alumina, or a combination thereof. The material of the packaging member (140) is not limited to the materials listed above and may be any one of the flame-retardant materials used in the industry.

[0100] FIG. 10 is a flowchart illustrating a method for manufacturing a secondary battery according to the present disclosure.

[0101] A method for manufacturing a secondary battery (1000) according to one embodiment of the present disclosure may be disclosed by stacking a first electrode, a separator, and a second electrode to form an electrode assembly (S1010).

[0102] Afterwards, the electrode assembly can be inserted into the case (S1020).

[0103] After that, a detachable member can be attached to the first surface of the case (S1030). Here, the plane of the detachable member may correspond to the shape of the first surface of the case.

[0104] In one embodiment, the detachable member may include at least one detachable portion that is detachable from a fitting portion of the device. Specifically, the detachable member includes a bonding surface in contact with a first surface and a detachable surface facing the bonding surface, and the detachable portion includes a side wall portion formed on the detachable surface along at least a portion of the perimeter of the detachable member, and the side wall portion may protrude from the detachable surface.

[0105] In one embodiment, the sidewall portion includes a first sidewall and a second sidewall facing each other, and at least one of the first sidewall or the second sidewall may include a hook that is detachably attached to the fitting portion. Additionally, the detachable portion may include a groove that is detachably attached to the fitting portion. In another embodiment, the detachable member may include an elastic portion.

[0106] According to another embodiment, the fitting part or the detachable member may be magnetic. Specifically, a magnetic body may be located around the fitting part or the detachable member. Here, the fitting part includes a first magnetic body and a second magnetic body, and the first magnetic body and the second magnetic body may have different poles.

[0107] Subsequently, a packaging member may be placed on the second surface of the case opposite to the first surface (S1040). Here, the packaging member may include a handle for being removed from the case. Additionally, the flat surface of the packaging member may correspond to the shape of the second surface of the case. The packaging member may include a flame-retardant material.

[0108] According to one embodiment of the present disclosure, the step (S1040) of placing a packaging member on a second surface of a case may include the step of interposing an adhesive layer between the packaging member and the case.

[0109] A method for manufacturing a secondary battery (1000) according to one embodiment of the present disclosure may further include the step of forming a terminal portion electrically connected to an electrode assembly and a protection circuit member electrically connected to the terminal portion.

[0110] Although the present invention has been described above by means of limited embodiments and drawings, the present invention is not limited thereto, and it is obvious that various modifications and variations are possible within the scope of the technical spirit of the present invention and the equivalent scope of the claims described below by those skilled in the art to which the present invention belongs. Since various substitutions, modifications, and changes are possible within the scope of the technical spirit of the present invention without departing from it, by those skilled in the art to which the present invention belongs, the present invention is not limited by the aforementioned embodiments and attached drawings. Explanation of the symbols

[0111] 100: Secondary battery 120: Case 121: Page 1 122: Page 2 130: Detachable member 132: Detachable part 134: Detachable surface 136: Joint surface 140: Packaging member 142: Handle 150: Terminal section 160: Absence of protection circuit 170: Adhesive layer

Claims

Claim 1 A secondary battery comprising: an electrode assembly formed by stacking a first electrode, a separator, and a second electrode; a case for housing the electrode assembly; a detachable member attached integrally with a first surface of the case; and a packaging member disposed on a second surface of the case opposite to the first surface, wherein the detachable member comprises at least one detachable portion coupled to a fitting portion of a device. Claim 2 In claim 1, the detachable member comprises a bonding surface in contact with the first surface and a detachable surface facing the bonding surface, and the detachable portion comprises a side wall portion formed on the detachable surface along at least a portion of the perimeter of the detachable member, and the side wall portion protrudes from the detachable surface, a secondary battery. Claim 3 A secondary battery according to paragraph 2, wherein the side wall portion comprises a first side wall and a second side wall facing each other, and at least one of the first side wall or the second side wall comprises a hook that is detachably attached to the fitting portion. Claim 4 A secondary battery according to claim 1, wherein the detachable part includes a groove that is detachable from the fitting part. Claim 5 In claim 1, the detachable member comprises an elastic part, a secondary battery. Claim 6 In claim 1, the insertion part or the detachable member is a secondary battery having magnetic properties. Claim 7 A secondary battery according to claim 6, wherein a magnetic material is located around the insertion part or the detachable member. Claim 8 In claim 6, the fitting part comprises a first magnetic body and a second magnetic body, and the first magnetic body and the second magnetic body have opposite poles, a secondary battery. Claim 9 A secondary battery according to claim 1, wherein the packaging member includes a handle for being removed from the case. Claim 10 A secondary battery according to claim 1, wherein an adhesive layer is interposed between the packaging member and the case. Claim 11 A secondary battery according to claim 1, wherein the flat surface of the packaging member corresponds to the shape of the second surface of the case. Claim 12 In claim 1, the packaging member comprises a flame-retardant material, a secondary battery. Claim 13 A secondary battery according to claim 1, wherein the plane of the detachable member corresponds to the shape of the first surface of the case. Claim 14 A secondary battery according to claim 1, further comprising: a terminal portion electrically connected to the electrode assembly; and a protection circuit member electrically connected to the terminal portion. Claim 15 A method for manufacturing a secondary battery, comprising the steps of: forming an electrode assembly by stacking a first electrode, a separator, and a second electrode; inserting the electrode assembly into a case; attaching a detachable member to a first surface of the case; and placing a packaging member on a second surface of the case opposite to the first surface, wherein the detachable member comprises at least one detachable portion that is detachable from a fitting portion of a device. Claim 16 A method for manufacturing a secondary battery according to claim 15, wherein the step of placing a packaging member on the second surface of the case includes the step of interposing an adhesive layer between the packaging member and the case. Claim 17 A method for manufacturing a secondary battery according to claim 15, further comprising the step of forming a terminal portion electrically connected to the electrode assembly and a protection circuit member electrically connected to the terminal portion. Claim 18 A method for manufacturing a secondary battery according to claim 15, wherein the detachable member comprises a bonding surface in contact with the first surface and a detachable surface opposite to the bonding surface, and the detachable portion comprises a side wall portion formed on the detachable surface along at least a portion of the perimeter of the detachable member, and the side wall portion protrudes from the detachable surface. Claim 19 A method for manufacturing a secondary battery according to claim 18, wherein the sidewall portion comprises a first sidewall and a second sidewall facing each other, and at least one of the first sidewall or the second sidewall comprises a hook that is detachably attached to the fitting portion. Claim 20 A method for manufacturing a secondary battery according to claim 15, wherein the detachable part comprises a groove that is detachable from the fitting part.

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