Secondary battery

Abstract

A secondary battery is disclosed. According to the present disclosure, there is provided a secondary battery comprising: an electrode assembly; an insulating case in which the electrode assembly is accommodated; and a housing accommodating the insulating housing therein, the insulating housing including: an upper insulating housing including a first lateral overlapping portion; and a lower insulating housing including a second lateral overlapping portion that overlaps the first lateral overlapping portion to form a lateral overlapping portion. The reinforcing structure for coping with inflation and the like is formed through the transverse overlapping part.

Description

Technical Field

[0001] The present disclosure relates to a secondary battery. Background Art

[0002] A secondary battery is a type of energy storage device that can be charged and discharged. It is widely used in various devices that use electricity as a power source. For example, secondary batteries are used as energy storage devices in a wide range of devices, from small devices like mobile phones, laptops, and tablets to large devices like vehicles and aircraft. In recent years, the use of secondary batteries as a power source for vehicles has been actively explored.

[0003] Secondary batteries can be categorized by electrode materials, such as lead-acid batteries, nickel-cadmium batteries, nickel-metal hydride batteries, and lithium-ion batteries. These types of secondary batteries can be selected based on design capacity, operating environment, and other factors. Compared to other secondary battery types, lithium-ion batteries offer relatively high voltage and capacity. Therefore, they are widely used in applications requiring high-density energy storage, such as vehicle battery packs.

[0004] The main configuration of a secondary battery such as a lithium-ion battery includes a positive electrode, a negative electrode, a separator, an electrolyte, etc. The positive electrode and the negative electrode are provided with a separator made of an insulating material therebetween, and can be charged or discharged by the movement of ions in the electrolyte.

[0005] On the other hand, in some types of secondary batteries, the electrode assembly including the positive electrode, negative electrode, separator, etc. can be housed inside an insulating bag. The insulating bag can be a flexible sheet made of a synthetic resin material such as polypropylene and can be formed to surround the outer surface of the electrode assembly. On the other hand, in certain other types of secondary batteries, the insulating bag as described above can be replaced by an insulating case having a predetermined thickness. The insulating case can form a predetermined internal space and can accommodate the electrode assembly in the internal space.

[0006] The above description is provided to help understand the technical background of the present disclosure and should not be interpreted as narrowing, defining or limiting the technical ideas of the present disclosure. In addition, the content recorded or described in the above description does not necessarily mean that it is prior art and may also include content that does not belong to the prior art. Utility Model Content

[0007] (1) Technical issues to be resolved

[0008] According to one aspect of the present disclosure, a secondary battery may be provided, which may implement a further improved reinforcement structure through an insulating case.

[0009] However, the technical problems to be solved by the embodiments of the present disclosure are not necessarily limited to the above-mentioned technical problems. Those skilled in the art can clearly understand other technical problems not mentioned from other descriptions in the specification such as the specific implementation methods.

[0010] The secondary battery disclosed herein can be widely used in electric vehicles, battery charging stations, and other battery-based green technology fields such as photovoltaic and wind power generation. Furthermore, the secondary battery disclosed herein can be used in eco-friendly electric vehicles and hybrid vehicles, which aim to prevent climate change by suppressing air pollution and greenhouse gas emissions.

[0011] (2) Technical solution

[0012] A secondary battery according to the present disclosure may include: an electrode assembly; an insulating shell, which accommodates the electrode assembly; and a shell, which accommodates the insulating shell, the insulating shell including: an upper insulating shell including a first lateral overlapping portion; and a lower insulating shell including a second lateral overlapping portion, the second lateral overlapping portion overlapping the first lateral overlapping portion to form a lateral overlapping portion.

[0013] According to one embodiment, the transverse overlapping portion may have a closed figure shape surrounding the circumference of the insulating housing in a plane.

[0014] According to one embodiment, the transverse overlapping portion may be provided in a center region in a height direction of the insulating housing.

[0015] According to one embodiment, the first lateral overlapping portion and the second lateral overlapping portion may overlap in the thickness direction of the insulating housing and may be bonded to each other by heat welding or bonding.

[0016] According to one embodiment, one side end portion of the upper insulating shell may overlap with the corresponding opposite side end portion to form a first longitudinal overlapping portion, and one side end portion of the lower insulating shell may overlap with the corresponding opposite side end portion to form a second longitudinal overlapping portion.

[0017] According to one embodiment, the first longitudinal overlapping portion and the second longitudinal overlapping portion may be correspondingly arranged under one surface of the insulating shell to form a cross with the transverse overlapping portion.

[0018] According to one embodiment, the transverse overlapping portion may have a predetermined height, which may be formed by overlapping the first transverse overlapping portion and the second transverse overlapping portion, and the height may be a predetermined degree greater than the overlapping width of the first longitudinal overlapping portion and the second longitudinal overlapping portion.

[0019] According to one embodiment, one of the first lateral overlapping portion and the second lateral overlapping portion can be formed by extending a bending area, and the bending area can be bent to a predetermined degree toward the outside of the insulating shell so that the inner surface of the insulating shell forms a plane at the joining portion of the first lateral overlapping portion and the second lateral overlapping portion.

[0020] According to one embodiment, the first transverse overlapping portion may include: a first protruding rib, which is formed to protrude toward the outside of the insulating shell, and a plurality of the first protruding ribs are arranged at predetermined intervals along the extension direction of the first transverse overlapping portion; and a first rib groove, which is formed between an adjacent pair of first protruding ribs, and the first rib groove and the first protruding rib are alternately and repeatedly arranged along the extension direction.

[0021] According to one embodiment, the second lateral overlapping portion may include: second protruding ribs, a plurality of second protruding ribs are arranged at predetermined intervals along the extension direction of the second lateral overlapping portion and engage with the first rib groove; and a second rib groove is formed between an adjacent pair of second protruding ribs and engages with the first protruding rib.

[0022] According to one embodiment, the first transverse overlapping portion can be formed by bending the lower end area of ​​the upper insulating shell, the second transverse overlapping portion can be formed by bending the upper end area of ​​the lower insulating shell to correspond to the first transverse overlapping portion, and the transverse overlapping portion can be formed by overlapping the bent parts of the first transverse overlapping portion and the second transverse overlapping portion up and down.

[0023] According to one embodiment, the first lateral overlapping portion may be formed by bending the lower end area of ​​the upper insulating shell toward the outside of the internal space, and the second lateral overlapping portion may be formed by bending the upper end area of ​​the lower insulating shell toward the outside of the internal space to correspond to the first lateral overlapping portion.

[0024] According to one embodiment, at least a portion of the transverse overlapping portion may be bent toward the outer surface of the insulating housing after the first transverse overlapping portion and the second transverse overlapping portion are joined.

[0025] According to one embodiment, the transverse overlapping portion may be formed by being divided at a position where the surfaces of the insulating housing meet with each other with a predetermined gap.

[0026] According to one embodiment, the upper insulating shell may include an upper portion for enclosing the upper side of the electrode assembly, and at least one of a first electrode channel, a second electrode channel, an exhaust port channel and an injection port channel may be provided on the upper portion; the lower insulating shell may include a lower portion for enclosing the lower side of the electrode assembly, and an electrolyte flow hole may be provided on the lower portion.

[0027] According to one embodiment, the insulating housing may be formed of a plate of insulating plastic material having a predetermined thickness.

[0028] (3) Beneficial effects

[0029] A secondary battery according to one embodiment of the present disclosure may include an insulating housing that houses an electrode assembly. The insulating housing may be divided into an upper insulating housing and a lower insulating housing, and the upper insulating housing and the lower insulating housing may form a transverse overlapping portion that laterally surrounds the inner space. Such a transverse overlapping portion may serve as a reinforcement to suppress bloating, etc., that occurs in the inner space. In addition, depending on the circumstances, the insulating housing may include a longitudinal overlapping portion that extends up and down from one side surrounding the inner space to assist in the reinforcement function, etc.

[0030] However, the technical effects achieved by the embodiments of the present disclosure are not necessarily limited to the above-mentioned effects. For those skilled in the art of the present disclosure, other technical effects not mentioned will be clearly understood through other descriptions in the specification such as the detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1a is a schematic perspective view of the appearance of a secondary battery according to one embodiment.

[0032] Figure 1b yes Figure 1a A schematic exploded perspective view of a secondary battery is shown.

[0033] Figure 1c yes Figure 1a Schematic internal cross-sectional view of a secondary battery shown.

[0034] Figure 2a is a schematic perspective view of an insulating housing according to one embodiment.

[0035] Figure 2b yes Figure 2a A schematic expanded view of the upper insulating housing is shown.

[0036] Figure 2c yes Figure 2a A schematic expanded view of the lower insulating housing is shown.

[0037] Figure 2dIs shown by Figure 2a The schematic diagram shows a state where the insulating shell encapsulates the electrode assembly.

[0038] Figure 3a is a schematic perspective view of an insulating housing according to another embodiment.

[0039] Figure 3b It is along Figure 3a Schematic cross-sectional view taken along lines C1-C1' and C2-C2'.

[0040] Figure 4a is a schematic perspective view of an insulating housing according to yet another embodiment.

[0041] Figure 4b yes Figure 4a A schematic partial expanded view of the insulating housing is shown.

[0042] Figure 4c Is shown by Figure 4a The schematic diagram shows a state where the insulating shell encapsulates the electrode assembly.

[0043] Description of reference numerals:

[0044] 100: Secondary battery 110: Housing

[0045] 120: Electrode assembly 130: Cover plate

[0046] 200: Insulation shell 210: Internal space

[0047] 220: Upper insulation shell 230: Lower insulation shell

[0048] 240: Horizontal overlapping portion 250: Vertical overlapping portion DETAILED DESCRIPTION

[0049] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. For the sake of convenience, detailed descriptions of known configurations or those that obscure the technical gist of the present disclosure will be omitted in the following description.

[0050] The following embodiments are provided to more fully illustrate the present disclosure to those skilled in the art. The following embodiments are provided to facilitate understanding of the present disclosure, and the technical concepts of the present disclosure are not limited to the specific embodiments described below. The present disclosure should be understood to broadly encompass various equivalents, alternatives, and variations that implement the technical concepts described in the following embodiments.

[0051] The terms used in the following embodiments are provided to more fully illustrate the specific embodiments based on the above-mentioned viewpoints. Therefore, the terms used in the following embodiments should not be interpreted as narrowing, defining or limiting the technical concept of the present disclosure.

[0052] In the following description, unless the context clearly excludes the plural number, the singular expression may be interpreted as including the plural number. In addition, in the following description, the expression "including" means that the described configuration, component, operation, feature, step, number, etc. are present, and does not mean to exclude the addition of one or more other configurations, components, operations, features, steps, numbers, etc.

[0053] In the following description, the terms "first," "second," etc. may be used to distinguish a specific component from other components. However, the purpose of using the terms is to distinguish a specific component from other components for clarity of description, and the technical concept of each component should not be interpreted as being limited by the terms.

[0054] The secondary batteries described in this specification may include batteries that can be charged and discharged. As an example, the secondary batteries may include lead-acid batteries, nickel-cadmium batteries, nickel-metal hydride batteries, lithium-ion batteries, etc. In this specification, it is assumed that the secondary batteries are lithium-ion batteries. Generally speaking, lithium-ion batteries may have advantages such as light weight, high energy density, and low self-discharge rate. However, it should be understood that the technical concepts described in this specification may also be applicable to other suitable types of batteries besides lithium-ion batteries.

[0055] The secondary battery described in this specification may include a single physical unit or a clustered unit composed of multiple such units. As an example, according to the classification standards commonly used in the automotive field, secondary batteries can be classified as battery cells, battery modules, battery packs, etc. In this specification, it is assumed that a secondary battery is a single unit, namely a battery cell. Generally speaking, a battery cell is the basic component of a battery pack and includes a positive electrode, a negative electrode, a separator, an electrolyte, etc. However, it should be understood that the technical concepts described in this specification can be applied to other suitable types of clustered units, such as battery modules and battery packs, as needed.

[0056] The secondary batteries described in this specification may include various packaging types. As an example, according to the classification standards currently commonly used in the relevant fields, the secondary batteries can be packaged into cylindrical, prismatic, pouch, coin-shaped, etc. In this description, it is assumed that the secondary batteries are packaged into prismatic shapes. Prismatic packages such as prismatic batteries generally have advantages in durability, safety, and ease of installation. However, it should be understood that the technical concepts described in this specification can be applied to other suitable packaging types, such as cylindrical, pouch, coin, etc., as needed.

[0057] The secondary batteries described in this specification can be used in various devices that require electric energy. As an example, the secondary battery can be applied to the field of vehicles that use electric energy as a main power source or an auxiliary power source. As another example, the secondary battery can be applied to the field of aircraft such as personal aircraft, drones, and unmanned aircraft, the field of electronic devices such as mobile phones, laptops, and tablet computers, and the field of power tools such as electric drills, electric grinders, and electric hammers. However, it should be understood that the secondary batteries described in this specification can be widely used in various devices that operate based on electric energy in addition to the above.

[0058] Figure 1a is a schematic perspective view of the appearance of a secondary battery according to one embodiment. Figure 1b yes Figure 1a A schematic exploded perspective view of a secondary battery is shown. Figure 1c yes Figure 1a Schematic internal cross-sectional view of a secondary battery shown.

[0059] For ease of explanation, a battery cell packaged in a prismatic shape is illustrated in this embodiment.

[0060] Reference Figures 1a to 1c , the secondary battery 100 according to the present embodiment may include a case 110 .

[0061] The housing 110 may provide an inner space capable of accommodating the electrode assembly 120 , etc. In the present embodiment, the housing 110 is illustrated as being substantially in the shape of a rectangular parallelepiped.

[0062] The housing 110 may include an opening 111 connected to the internal space. In this embodiment, the opening 111 is illustrated as being provided at the upper end of the housing 110. However, the position of the opening 111 may be changed as needed and is not necessarily limited to the example shown. The opening 111 may serve as a passage for inserting the electrode assembly 120, etc. In addition, the opening 111 may also serve as a connection space for electrical connection between the electrode assembly 120 and the electrode terminal. The opening 111 may be closed by the cover plate 130.

[0063] The material of the case 110 may be appropriately selected based on thermal conductivity and electrical conductivity, rigidity corresponding to swelling of the electrode assembly 120 , processability, manufacturing cost, etc. As an example, the case 110 may be made of a metal material including aluminum, aluminum alloy, etc.

[0064] On the other hand, the secondary battery 100 according to the present embodiment may include an electrode assembly 120 .

[0065] The electrode assembly 120 may be disposed in the interior space of the housing 110. In this embodiment, the electrode assembly 120 may be housed in an insulating housing 124 within the housing 110. The insulating housing 124 will be referred to later. Figure 2a Wait for detailed explanation.

[0066] The electrode assembly 120 may include a positive electrode 121. The positive electrode 121 may include a positive electrode collector and a positive electrode active material. In some embodiments, the positive electrode collector may include aluminum, an aluminum alloy, or the like, and the positive electrode active material may include lithium cobalt oxide, lithium manganese oxide, lithium nickel oxide, lithium iron phosphate, or the like. The positive electrode active material may be coated on the surface of the positive electrode collector. The portion of the positive electrode collector that is not coated with the positive electrode active material may serve as a positive electrode tab 121a. In some embodiments, a plurality of positive electrode tabs 121a may be provided, and some or all of the plurality of positive electrode tabs 121a may be joined to each other.

[0067] The electrode assembly 120 may include a negative electrode 122. The negative electrode 122 may include a negative electrode current collector and a negative electrode active material. In some embodiments, the negative electrode current collector may include copper, a copper alloy, nickel, a nickel alloy, etc., and the negative electrode active material may include carbon, silicon, etc. The negative electrode active material may be coated on the surface of the negative electrode current collector. The portion of the negative electrode current collector not coated with the negative electrode active material may serve as a negative electrode tab 122a. In some embodiments, multiple negative electrode tabs 122a may be provided, and some or all of the multiple negative electrode tabs 122a may be joined to each other.

[0068] The electrode assembly 120 may include a separator 123. The separator 123 may be disposed between the positive electrode 121 and the negative electrode 122. The separator 123 may limit the physical contact between the positive electrode 121 and the negative electrode 122 and provide a channel for ion movement. In some embodiments, the separator 123 may be made of a polymer material including polyethylene, polypropylene, etc. In addition, the separator 123 may include a dry separator and a wet separator. In some embodiments, the separator 123 may include a coating including a ceramic coating, etc.

[0069] The electrode assembly 120 can be formed by arranging the above components in a winding, stacking, or other manner. As an example, the electrode assembly 120 can be formed into a structure in which the positive electrode 121, the negative electrode 122, and the separator 123 are wound around a longitudinal axis or a transverse axis. Alternatively, the electrode assembly 120 can be formed into a structure in which the wound structure is extruded in a direction substantially perpendicular to the winding axis. This wound structure may be referred to in the art as a "jelly roll," for example.

[0070] As another example, the electrode assembly 120 may be formed into a stacked structure of a positive electrode 121, a negative electrode 122, and a separator 123. In some cases, in the stacked structure, the separator 123 may be formed into a structure in which a plurality of unit separators 123 continuous in the length direction are folded in sequence according to the stacking of the positive electrode 121 and the negative electrode 122 to be stacked. The stacked structure may be referred to in the art as "stack and folding," "z-folding," or the like. However, in this embodiment, the arrangement of the components of the electrode assembly 120 is not particularly limited. The electrode assembly 120 may have a variety of arrangements other than the above examples.

[0071] In some embodiments, the electrode assembly 120 may be composed of a plurality of unit cells. As an example, the electrode assembly 120 may include a unit cell wound in a jellyroll manner, and two or more of the unit cells may be combined to form the electrode assembly 120. In this embodiment, the electrode assembly 120 is composed of two jellyroll units. As another example, the electrode assembly 120 may include a unit cell wound in a stacked and folded manner, and two or more of the unit cells may be combined to form the electrode assembly 120.

[0072] The electrode assembly 120 can be housed within the interior space of the housing 110 along with an electrolyte. In some embodiments, the electrolyte can be formed from an organic solvent containing a lithium salt. As an example, the lithium salt can include liquid or gel-like lithium hexafluorophosphate (LiPF6) or lithium tetrafluoroborate (LiBF4). The organic solvent can include cyclic carbonates such as ethylene carbonate (EC) and propylene carbonate (PC), or linear carbonates such as diethyl carbonate (DEC), dimethyl carbonate (DMC), or ethyl methyl carbonate (EMC).

[0073] In some other embodiments, the electrolyte can be omitted or replaced. As an example, if an inorganic solid electrolyte is used, the liquid or gel electrolyte can be omitted.

[0074] On the other hand, the secondary battery 100 according to the present embodiment may include a cap plate 130 .

[0075] The cover plate 130 may be used to close the opening 111. In this embodiment, the cover plate 130 is illustrated as a quadrilateral plate shape corresponding to the opening 111. The cover plate 130 may be coupled to the housing 110 to seal the interior space of the housing 110 in which the electrode assembly 120 is disposed. In some embodiments, the cover plate 130 may be welded to the housing 110 by ultrasonic welding, laser welding, or the like.

[0076] The cover plate 130 may be provided with a positive terminal 131 and a negative terminal 132. The positive terminal 131 may be electrically connected to the positive electrode tab 121a of the electrode assembly 120, and the negative terminal 132 may be electrically connected to the negative electrode tab 122a of the electrode assembly 120.

[0077] The cover plate 130 may include an electrolyte injection port 134. The electrolyte injection port 134 can be used to inject electrolyte into the internal space of the housing 110. In this embodiment, the electrolyte injection port 134 is provided adjacent to the exhaust port 133 in the central area of ​​the cover plate 130. However, the position of the electrolyte injection port 134 can be variously changed and is not necessarily limited to the example shown. After electrolyte injection, chemical formation process, etc., the electrolyte injection port 134 can be appropriately sealed. In some embodiments, the electrolyte injection port 134 can be sealed by pressing in a spherical sealing member made of a polymer resin.

[0078] The cover plate 130 may include an exhaust port 133. In this embodiment, the exhaust port 133 is located between the positive terminal 131 and the negative terminal 132. However, the location of the exhaust port 133 may be modified as needed and is not necessarily limited to the illustrated example. In other embodiments, the exhaust port 133 may be disposed on or attached to the housing 110. The exhaust port 133 may be configured to open in response to internal pressure within the housing 110. The exhaust port 133 serves to discharge the internal pressure to the exterior of the housing 110, thereby stabilizing the internal components of the housing 110.

[0079] The insulating case 124 accommodating the electrode assembly 120 will be described in detail below. For convenience, the insulating case according to each embodiment will be given a new reference numeral and described below.

[0080] Figure 2a is a schematic perspective view of an insulating housing according to one embodiment. Figure 2b yes Figure 2a A schematic expanded view of the upper insulating housing is shown. Figure 2c yes Figure 2a A schematic expanded view of the lower insulating housing is shown.

[0081] Reference Figures 2a to 2c Insulating housing 200 of this embodiment may define an interior space 210 for accommodating electrode assembly 120. In this embodiment, interior space 210 is illustrated as a rectangular parallelepiped space with a left-right length that is relatively greater than a front-to-back length. However, the shape and size of interior space 210 may be modified as needed and are not necessarily limited to the illustrated example.

[0082] The insulating housing 200 of this embodiment can be divided into two parts, namely, the insulating housing 200 can include an upper insulating housing 220 and a lower insulating housing 230 .

[0083] The upper insulating case 220 may form an upper region of the insulating case 200, and the lower insulating case 230 may form a lower region of the insulating case 200. The upper insulating case 220 and the lower insulating case 230 may be combined to form an inner space 210 for accommodating the electrode assembly 120.

[0084] The upper insulating housing 220 may include an upper rear surface portion 221 , first and second upper side surfaces 222 and 223 , first and second upper front surfaces 224 a and 224 b , and an upper surface portion 225 .

[0085] The upper rear portion 221 may have a predetermined left-right width and top-to-bottom height and may extend in a generally rectangular shape. The first upper side portion 222 may extend from one end portion of the upper rear portion 221 (the left side in the figure) and may bend forward about a boundary line with the upper rear portion 221. Similarly, the second upper side portion 223 may extend from an opposite end portion of the upper rear portion 221 (the right side in the figure) and may bend forward about a boundary line with the upper rear portion 221. In this embodiment, the first and second upper side portions 222 and 223 are illustrated as having widths that are substantially smaller than the width of the upper rear portion 221.

[0086] On the other hand, the first upper front portion 224a can be formed by extending from one end portion (front end in the figure) of the first upper side portion 222 and can bend laterally (to the right in the figure) with the boundary line with the first upper side portion 222 as the center. Similarly, the second upper front portion 224b can be formed by extending from one end portion (front end in the figure) of the second upper side portion 223 and can bend laterally (to the left in the figure) with the boundary line with the second upper side portion 223 as the center. The first and second upper front portions 224a and 224b can form the upper front portion 224 corresponding to the upper rear portion 221. The upper front portion 224 can be arranged in front of and behind the upper rear portion 221, with the internal space 210 interposed between them.

[0087] The upper portion 225 may extend left and right from the upper end of the upper rear portion 221. The upper portion 225 may bend forward about the boundary line with the upper rear portion 221 to enclose the upper end of the internal space 210. Furthermore, the upper portion 225 may be formed with a plurality of channels for components of the electrode assembly 120 or the cover plate 130. In this embodiment, the upper portion 225 may be formed with first and second electrode channels 225a and 225b for the negative electrode tab 122a and the positive electrode tab 121a, an exhaust channel 225c for the exhaust port 133, and an injection port channel 225d for the electrolyte injection port 134.

[0088] On the other hand, the lower insulating housing 230 may include a lower rear portion 231 , first and second lower side portions 232 and 233 , first and second lower front portions 234 a and 234 b , and a lower portion 235 .

[0089] The lower rear portion 231 and the lower portion 235 can be formed similarly to the upper rear portion 221 and the upper portion 225 described above. The lower rear portion 231 can have a predetermined left-right width and a predetermined height, and can be formed to extend in a generally rectangular shape. Furthermore, a first lower side portion 232 can extend from one end portion of the lower rear portion 231 (the left side in the figure) and can bend forward about the boundary line with the lower rear portion 231. A second lower side portion 233 can extend from the opposite end portion of the lower rear portion 231 (the right side in the figure) and can bend forward about the boundary line with the lower rear portion 231.

[0090] On the other hand, the first lower front portion 234a can be formed by extending from one end portion (front end in the figure) of the first lower side portion 232 and can be bent laterally (to the right in the figure) with the boundary line with the first lower side portion 232 as the center. The second lower front portion 234b can be formed by extending from one end portion (front end in the figure) of the second lower side portion 233 and can be bent laterally (to the left in the figure) with the boundary line with the second lower side portion 233 as the center. The first and second lower front portions 234a and 234b can form the lower front portion 234 corresponding to the lower rear portion 231.

[0091] The lower portion 235 may extend leftward and rightward from the lower end of the lower rear portion 231. The lower portion 235 may be bent forward about the boundary line with the lower rear portion 231 to seal the lower end of the internal space 210. Optionally, the lower portion 235 may be formed with an electrolyte flow hole 235a for flowing electrolyte into the internal space 210 of the insulating housing 200. A plurality of electrolyte flow holes 235a may be provided at intervals in the lower portion 235.

[0092] On the other hand, the insulation housing 200 according to the present embodiment may include a transverse overlapping portion 240 .

[0093] The lateral overlap portion 240 may be formed by overlapping a lower end region of the upper insulating housing 220 and an upper end region of the lower insulating housing 230. The lateral overlap portion 240 may be formed to extend in a manner of circumferentially surrounding the insulating housing 200.

[0094] The transverse overlapping portion 240 may have a predetermined height H1 in the vertical direction. In some embodiments, the height H1 may account for 3-20% of the total height of the insulating housing 200 .

[0095] The lateral overlap portion 240 can have a closed shape in plan view, surrounding the perimeter of the insulating housing 200. In this embodiment, the lateral overlap portion 240 has a closed quadrilateral shape in plan view. Such a lateral overlap portion 240 can serve as a reinforcement to limit lateral expansion in that area. As an example, the lateral overlap portion 240 can serve as a reinforcement to suppress swelling occurring in the interior space 210.

[0096] In this embodiment, the transverse overlap portion 240 can be disposed at the center of the insulating housing 200 in the height direction. The centrally disposed transverse overlap portion 240 can serve as a reinforcement to suppress air expansion in the central region. This is because air expansion typically causes relatively large displacement in the central region of the insulating housing 200.

[0097] The transverse overlapping portion 240 can be provided by forming the upper insulating housing 220 and the lower insulating housing 230 to have the same total height. That is, the upper insulating housing 220 and the lower insulating housing 230 can be formed to have the same height, and the lower end of the upper insulating housing 220 and the upper end of the lower insulating housing 230 can overlap by a predetermined area, thereby forming the transverse overlapping portion 240 at the center of the height direction of the insulating housing 200.

[0098] However, as needed, the transverse overlap portion 240 can be positioned in various locations other than the illustrated central region and is not necessarily limited to the illustrated example. For example, in other embodiments, the transverse overlap portion 240 can be positioned in an upper region closer to the central region of the upper end of the insulating housing 200 or in a lower region closer to the central region of the lower end of the insulating housing 200. Furthermore, the location of the transverse overlap portion 240 can be appropriately selected based on testing and analysis of a specific type of secondary battery to determine the location that requires reinforcement.

[0099] On the other hand, the transverse overlapping portion 240 may be formed by overlapping the first transverse overlapping portion 241 of the upper insulating case 220 with the second transverse overlapping portion 242 of the lower insulating case 230 .

[0100] The first lateral overlapping portion 241 may be formed at the lower end region of the upper insulating shell 220, and the second lateral overlapping portion 242 may be formed at the upper end region of the lower insulating shell 230. In this embodiment, based on the internal space 210, the first lateral overlapping portion 241 is arranged on the outside, and the second lateral overlapping portion 242 is arranged on the inside, and the first and second lateral overlapping portions 241 and 242 overlap in the thickness direction. However, as Figure 3a As shown in the examples shown, the inner and outer positions of the first and second lateral overlapping portions 241 and 242 can be appropriately changed as needed and are not necessarily limited to the examples shown.

[0101] The first lateral overlapping portion 241 may be formed and extended along the circumference of the upper insulating housing 220 at the lower end region of the upper insulating housing 220. That is, the first lateral overlapping portion 241 may be formed and extended along each lower end region of the first upper front portion 224a, the first upper side portion 222, the upper rear portion 221, the second upper side portion 223, and the second upper front portion 224b.

[0102] Similar to the above, the second lateral overlapping portion 242 may be formed extending along the circumference of the lower insulating housing 230 at the upper end region of the lower insulating housing 230. That is, the second lateral overlapping portion 242 may be formed extending along each upper end region of the first lower front portion 234a, the first lower side portion 232, the lower rear portion 231, the second lower side portion 233, and the second lower front portion 234b.

[0103] The first and second transverse overlapping portions 241 and 242 can be joined together by a predetermined joining means to form a transverse overlapping portion 240. In some embodiments, the first and second transverse overlapping portions 241 and 242 can be joined together by heat welding or bonding means. The bonding means may include adhesives, adhesive resins, insulating tape, etc.

[0104] On the other hand, the insulation case 200 according to the present embodiment may include a longitudinal overlapping portion 250 .

[0105] A portion of the longitudinal overlapping portion 250 can be formed by overlapping one end region of the upper insulating housing 220 with the corresponding opposite end region. Alternatively, the remaining portion of the longitudinal overlapping portion 250 can be formed by overlapping one end region of the lower insulating housing 230 with the corresponding opposite end region. For convenience, in this description, the portion of the longitudinal overlapping portion 250 formed by the overlapping of the upper insulating housing 220 is referred to as the first longitudinal overlapping portion 251, and the remaining portion of the longitudinal overlapping portion 250 formed by the overlapping of the lower insulating housing 230 is referred to as the second longitudinal overlapping portion 252. Therefore, the longitudinal overlapping portion 250 can include first and second longitudinal overlapping portions 251 and 252.

[0106] The first longitudinal overlapping portion 251 can extend vertically from the upper end to the lower end of the upper insulating housing 220. Furthermore, the first longitudinal overlapping portion 251 can have a predetermined width W1 in the left-right direction. In some embodiments, the width W1 can be a predetermined degree less than the height H1 of the transverse overlapping portion 240. As an example, in this embodiment, the width W1 of the first longitudinal overlapping portion 251 is approximately 50% of the height H1 of the transverse overlapping portion 240. This is because, unlike the transverse overlapping portion 240, the primary function of the first longitudinal overlapping portion 251 is to provide a connection.

[0107] Similar to the above, the second longitudinal overlapping portion 252 may extend from the upper end to the lower end of the lower insulating housing 230. In addition, the second longitudinal overlapping portion 252 may have a predetermined width W1 in the left-right direction. In this embodiment, the second longitudinal overlapping portion 252 is illustrated as having a width W1 corresponding to the first longitudinal overlapping portion 251.

[0108] On the other hand, in this embodiment, both the first and second longitudinal overlapping portions 251 and 252 can be disposed at the front of the insulating housing 200 and can be arranged vertically and continuously at the left and right center positions of the insulating housing 200. Such first and second longitudinal overlapping portions 251 and 252 can intersect with the transverse overlapping portion 240 at the front of the insulating housing 200 in a roughly cross-shaped pattern. This arrangement facilitates the automation of the joining operation and the inspection and determination of joint failures.

[0109] However, the arrangement of the first and second longitudinal overlapping portions 251 and 252 is not necessarily limited to the example shown. For example, in some embodiments, the first and second longitudinal overlapping portions 251 and 252 can be arranged at positions deviated from the left and right centers of the insulating housing 200, or the first and second longitudinal overlapping portions 251 and 252 can be arranged to be discontinuous up and down. In addition, in some other embodiments, the first and second longitudinal overlapping portions 251 and 252 can be respectively arranged on different surfaces of the insulating housing 200. As an example, Figure 3aThe examples shown above illustrate the case where the first and second longitudinal overlapping portions 251 and 252 are respectively provided at the front or rear.

[0110] On the other hand, the first longitudinal overlapping portion 251 can be formed by overlapping a first longitudinal overlapping portion 251a formed at one end of the upper insulating housing 220 with a first longitudinal overlapping portion 251b formed at the corresponding opposite end of the upper insulating housing 220. Furthermore, the second longitudinal overlapping portion 252 can be formed by overlapping a second longitudinal overlapping portion 252a formed at one end of the lower insulating housing 230 with a second longitudinal overlapping portion 252b formed at the corresponding opposite end of the lower insulating housing 230. The overlapping structure of the first and second longitudinal overlapping portions 251 and 252 is substantially similar to that of the aforementioned transverse overlapping portion 240.

[0111] On the other hand, the insulating housing 200 including the upper insulating housing 220 and the lower insulating housing 230 can be formed of a plate of an insulating plastic material having a predetermined thickness. For example, a portion or all of the insulating housing 200 can include a material such as polyamide, polyacetal, polycarbonate, polyethylene terephthalate, modified polyphenylene ether, fluororesin, polyphenylene sulfide, polyarylate, polyethersulfone, polyetheretherketone, or polyetherimide.

[0112] Figure 2d Is shown by Figure 2a The schematic diagram shows a state where the insulating shell encapsulates the electrode assembly.

[0113] Reference Figure 2d , the upper insulating case 220 and the lower insulating case 230 may be combined with each other to form an inner space for accommodating the electrode assembly 120 ( Figure 2a For ease of explanation, the upper insulating housing 220 is shown in a partially expanded form in this figure.

[0114] In some embodiments, the upper insulating housing 220 and the lower insulating housing 230 may be pre-joined except for the upper portion 225. Specifically, the upper rear portion 221, the first and second upper side portions 222 and 223, and the first and second upper front portions 224a and 224b of the upper insulating housing 220 may be bent about their respective boundaries, and the first-first longitudinal overlapping portion 251a and the first-second longitudinal overlapping portion 251b may overlap and join with each other. The upper portion 225 may be disposed with the upper end of the internal space 210 open to facilitate insertion of the electrode assembly 120.

[0115] Furthermore, the lower rear portion 231, the first and second lower side portions 232 and 233, and the first and second lower front portions 234a and 234b of the lower insulating housing 230 may be curved about their respective boundaries, and the second-first longitudinal overlapping portion 252a and the second-second longitudinal overlapping portion 252b may overlap and join with each other. Furthermore, the lower portion 235 may close the lower surface of the lower insulating housing 230.

[0116] The upper insulating case 220 and the lower insulating case 230 as described above may form a lateral overlapping portion 240 and may be joined up and down.

[0117] With the upper insulating housing 220 and the lower insulating housing 230 joined together, the electrode assembly 120 can be inserted into the interior space 210 through the upper end of the upper insulating housing 220. After the electrode assembly 120 is fully inserted, the upper portion 225 can be bent and joined to seal the upper end of the interior space 210. Thus, the electrode assembly 120, excluding some components such as the electrode tabs, can be housed within the interior of the insulating housing 200.

[0118] The insulating case 200 as described above may be formed with a transverse overlapping portion 240 transversely surrounding the inner space 210 accommodating the electrode assembly 120 . Such a transverse overlapping portion 240 may serve as a reinforcement to prevent the region from expanding.

[0119] Figure 3a is a schematic three-dimensional diagram of an insulating housing according to another embodiment.

[0120] For convenience, the following description will focus on the differences from the above-mentioned embodiment.

[0121] Reference Figure 3a The insulating housing 300 of this embodiment includes an upper insulating housing 320 and a lower insulating housing 330 , which can be divided into upper and lower parts. The upper insulating housing 320 and the lower insulating housing 330 can form an inner space 310 for accommodating the electrode assembly 120 .

[0122] The upper insulating housing 320 may include first and second upper rear surface portions 321a and 321b, first and second upper side portions 322 and 323, an upper front portion 324, and an upper portion 325. Compared to the above-described embodiment, the upper rear surface portion 321 of the upper insulating housing 320 of this embodiment is divided into the first and second upper rear surface portions 321a and 321b.

[0123] The lower insulating housing 330 may include a lower rear portion 331, first and second lower side portions 332 and 333, first and second lower front portions 334a and 334b, and a lower portion 335. In this embodiment, the lower insulating housing 330 may be formed similarly to the above-described embodiments.

[0124] On the other hand, the insulating housing 300 of this embodiment may include a transverse overlapping portion 340. The transverse overlapping portion 340 may be formed by overlapping the lower end region of the upper insulating housing 320 with the upper end region of the lower insulating housing 330, and may extend laterally around the circumference of the insulating housing 300. The transverse overlapping portion 340 may have a closed shape surrounding the circumference of the insulating housing 300, thereby serving as a reinforcement to limit lateral expansion. In this embodiment, the transverse overlapping portion 340 is arranged with the lower end region of the upper insulating housing 320 positioned inwardly and the upper end region of the lower insulating housing 330 positioned outwardly, overlapping in the thickness direction, which differs from the above-described embodiments.

[0125] On the other hand, the insulating housing 300 of this embodiment may include a longitudinal overlapping portion 350. The longitudinal overlapping portion 350 may include a first longitudinal overlapping portion 351 and a second longitudinal overlapping portion 352. The first longitudinal overlapping portion 351 may be formed by overlapping an end region on one side of the upper insulating housing 320 with an end region on the corresponding opposite side. The second longitudinal overlapping portion 352 may be formed by overlapping an end region on one side of the lower insulating housing 330 with an end region on the corresponding opposite side.

[0126] In this embodiment, the first and second longitudinal overlapping portions 351 and 352 are located at the front or rear of the insulating housing 300, which differs from the previous embodiments. Specifically, the first longitudinal overlapping portion 351 is located at the rear of the insulating housing 300 by overlapping the first upper rear portion 321a and the second upper rear portion 321b, while the second longitudinal overlapping portion 352 is located at the front of the insulating housing 300 by overlapping the first lower front portion 334a and the second lower front portion 334b. Furthermore, in this embodiment, the width W1 of the longitudinal overlapping portion 350 corresponds to the height H1 of the transverse overlapping portion 340.

[0127] Figure 3b (a) is along Figure 3a Schematic cross-sectional view taken along line C1-C1'.

[0128] Reference Figure 3bIn (a), a first transverse overlapping portion 341 may be formed at the lower end region of the upper insulating housing 320, and a second transverse overlapping portion 342 may be formed at the upper end region of the lower insulating housing 330. The first and second transverse overlapping portions 341 and 342 may overlap in the thickness direction of the insulating housing 300 to form a transverse overlapping portion 340.

[0129] exist Figure 3b In (a), the right side of the first and second lateral overlapping portions 341 and 342 faces the interior space 310 of the insulating housing 300, and the left side of the first and second lateral overlapping portions 341 and 342 faces the exterior (OUT) of the insulating housing 300. In this embodiment, the first lateral overlapping portion 341 faces the interior space 310, and the second lateral overlapping portion 342 faces the exterior (OUT).

[0130] Here, the second lateral overlap portion 342 of this embodiment can be formed by extending from the lower insulating housing 330 via a curved region 342a. The curved region 342a can be curved and extended to a predetermined degree toward the exterior (OUT) of the insulating housing 300. The curved region 342a prevents the formation of a protrusion on the inner surface of the insulating housing 300 in the region where the lateral overlap portion 340 is formed. In other words, the curved region 342a allows the inner surface of the first lateral overlap portion 341, which faces the interior space 310, and the inner surface of the lower insulating housing 330, which faces the interior space 310, to form a corresponding plane SF. This facilitates the insertion of the electrode assembly 120 and optimizes the interior space.

[0131] On the other hand, although the above description is based on the illustrated drawings, the case where the curved area 342a is formed in the second lateral overlapping portion 342, the curved area 342a can be appropriately changed in its object, position, etc. according to the arrangement relationship of each component. Figure 2a In the embodiment described above, the curved region 342a may be formed in the first transverse overlapping portion 241. In addition, the curved region 342a described above may also be similarly formed in the first longitudinal overlapping portion 351 or the second longitudinal overlapping portion 352 as needed.

[0132] Figure 3b (b) is along Figure 3a Schematic cross-sectional view taken along line C2-C2'.

[0133] Reference Figure 3b (b), as needed, the first lateral overlapping portion 341 and the second lateral overlapping portion 342 may be combined by a structure in which the protruding ribs 341 b and 342 b and the rib grooves 341 c and 342 c are engaged with each other.

[0134] Specifically, the first transverse overlapping portion 341 may include a first protruding rib 341b and a first rib groove 341c. The first protruding rib 341b may be formed to protrude toward the exterior (OUT) of the insulating housing 300. A plurality of first protruding ribs 341b may be spaced apart at predetermined intervals along the extending direction of the first transverse overlapping portion 341. A first rib groove 341c may be formed between adjacent pairs of first protruding ribs 341b. In this embodiment, the first protruding ribs 341b and the first rib groove 341c are alternately and repeatedly arranged along the extending direction of the first transverse overlapping portion 341.

[0135] The second transverse overlapping portion 342 may include a second protruding rib 342b and a second rib groove 342c. The second protruding rib 342b may be formed to protrude toward the interior space 310 of the insulating housing 300, and a plurality of second protruding ribs 342b may be spaced apart at predetermined intervals along the extension direction of the second transverse overlapping portion 342. In addition, the second protruding rib 342b may be formed corresponding to the first rib groove 341c to engage with the first rib groove 341c. On the other hand, the second rib groove 342c may be formed between an adjacent pair of second protruding ribs 342b. In this embodiment, the second protruding rib 342b and the second rib groove 342c are alternately and repeatedly arranged along the extension direction of the second transverse overlapping portion 342. The second rib groove 342c is formed corresponding to the first protruding rib 341b to engage with the first protruding rib 341b.

[0136] As described above, the first and second lateral overlapping portions 341 and 342 can be combined by the first protruding rib 341b engaging with the second rib groove 342c, and the second protruding rib 342b engaging with the first rib groove 341c, thereby providing additional support in the direction of extension. Specifically, the structure in which the protruding ribs 341b and 342b and the rib grooves 341c and 342c engage with each other provides a predetermined support structure in the direction of extension of the first and second lateral overlapping portions 341 and 342. This support structure can more effectively limit inflation of the first and second lateral overlapping portions 341 and 342.

[0137] Figure 4a is a schematic perspective view of an insulating housing according to yet another embodiment. Figure 4b yes Figure 4a A schematic partial expanded view of the insulating housing is shown.

[0138] Reference Figure 4a and Figure 4b , the insulating housing 400 according to this embodiment may include an upper insulating housing 420 and a lower insulating housing 430. Figure 2aSimilar to the above-mentioned embodiment, the upper insulating case 420 may include an upper rear portion 421, first and second upper side portions 422 and 423, first and second upper front portions 424a and 424b, and an upper portion 425, and the lower insulating case 430 may include a lower rear portion 431, first and second lower side portions 432 and 433, first and second lower front portions 434a and 434b, and a lower portion 435. The upper insulating case 420 and the lower insulating case 430 may form an inner space 410 for accommodating the electrode assembly 120.

[0139] On the other hand, the insulating housing 400 of this embodiment may include a transverse overlapping portion 440. Here, the transverse overlapping portion 440 of this embodiment may be formed into a structure that is curved to a predetermined degree toward the outside of the interior space 410. Specifically, the lower end region of the upper insulating housing 420 may be curved to a predetermined degree toward the outside of the interior space 410 to form a first transverse overlapping portion 441. The upper end region of the lower insulating housing 430 may be curved to a predetermined degree toward the outside of the interior space 410 to form a second transverse overlapping portion 442. The transverse overlapping portion 440 of this embodiment may be formed by overlapping the first and second transverse overlapping portions 441 and 442 having the curved structures described above.

[0140] The lateral overlap portion 440 can be bent to further enhance the structural rigidity of the lateral overlap portion 440. In addition, the lateral overlap portion 440 can expose the ends of the first and second lateral overlap portions 441 and 442 to the outside of the internal space 410, thereby making it easier to perform the joining process between the first and second lateral overlap portions 441 and 442. In addition, the lateral overlap portion 440 can prevent the formation of protrusions on the inner surfaces of the upper insulating shell 420 and the lower insulating shell 430 (see FIG. Figure 3b ), which is beneficial to the insertion of the electrode assembly 120, optimization of the internal space, etc.

[0141] On the other hand, the lateral overlapping portion 440 as described above may be appropriately bent after being joined, as needed. Figure 4a The example illustrates a case where a lateral overlap portion 440 provided on the right side of the insulating housing 400 is bent. In this case, the lateral overlap portion 440 can be bent using a predetermined external force after joining so that it abuts the outer surface of the insulating housing 400. Alternatively, in this case, the lateral overlap portion 440 can be partially split and formed with a predetermined gap G at the locations where the surfaces of the insulating housing 400 meet, allowing for bending along the surfaces of the insulating housing 400.

[0142] On the other hand, the insulating shell 400 of this embodiment may include a longitudinal overlapping portion 450. The longitudinal overlapping portion 450 may include a first longitudinal overlapping portion 451 and a second longitudinal overlapping portion 452. The first longitudinal overlapping portion 451 may be formed by overlapping an end region of one side of the upper insulating shell 420 with an end region of the corresponding opposite side. The second longitudinal overlapping portion 452 may be formed by overlapping an end region of one side of the lower insulating shell 430 with an end region of the corresponding opposite side. In this embodiment, Figure 2a Similar to the embodiments shown in , etc., the first and second longitudinal overlapping portions 451 and 452 are both provided at the front of the insulating housing 400 .

[0143] As needed, the longitudinal overlapping portion 450 of this embodiment may be formed similarly to the above-mentioned transverse overlapping portion 440 , with each end region being bent to a predetermined degree and joined to each other.

[0144] Figure 4c Is shown by Figure 4a The schematic diagram shows a state where the insulating shell encapsulates the electrode assembly.

[0145] Reference Figure 4c , the upper insulating case 420 and the lower insulating case 430 may be combined with each other to form an inner space for accommodating the electrode assembly 120 ( Figure 4a For ease of explanation, the lower insulating housing 430 is shown in a partially unfolded form in this figure.

[0146] In some embodiments, the upper insulating shell 420 and the lower insulating shell 430 may be pre-joined with the remaining parts except the upper part 425. As needed, the transverse overlapping part 440 and the longitudinal overlapping part 450 may be appropriately bent after joining. In some embodiments, only a portion of the transverse overlapping part 440 and the longitudinal overlapping part 450 may be bent, while the remaining parts may remain in an expanded state after joining. As an example, the transverse overlapping part 440 may remain in an expanded state after joining, while the longitudinal overlapping part 450 may be appropriately bent after joining. As another example, in the transverse overlapping part 440, the parts corresponding to the front and rear parts of the insulating shell 400 may remain in an expanded state after joining, while the remaining parts corresponding to the left and right sides of the insulating shell 400 may be appropriately bent after joining.

[0147] On the other hand, the electrode assembly 120 can be inserted into the inner space 410 through the upper end of the upper insulating shell 420 in a state where the upper insulating shell 420 and the lower insulating shell 430 are joined up and down as described above, and then the upper portion 425 can be bent and joined to close the inner space 410. This is similar to the previous reference to Figure 2d The description is similar.

[0148] As described above, a secondary battery according to an embodiment of the present disclosure may include an insulating housing that houses an electrode assembly. The insulating housing may be divided into an upper insulating housing and a lower insulating housing, and the upper insulating housing and the lower insulating housing may form a transverse overlapping portion that laterally surrounds the interior space. Such a transverse overlapping portion may serve as a reinforcement to suppress flatulence. In addition, depending on the circumstances, the insulating housing may include a longitudinal overlapping portion that extends up and down from one side surrounding the interior space to assist in the reinforcement function, etc.

[0149] The embodiments of the present disclosure are described above, but technicians in the relevant technical field can make various modifications or changes to the present disclosure by adding, changing, deleting or adding components without departing from the scope of the technical ideas of the present disclosure recorded in the claims, and these modifications or changes should be included in the scope of the rights of the present disclosure.

Claims

1. A secondary battery, characterized in that: include: electrode assembly; an insulating shell, which contains the electrode assembly; as well as a housing, the interior of which accommodates the insulating housing, The insulating housing comprises: an upper insulating housing including a first transverse overlapping portion; as well as The lower insulating shell includes a second transverse overlapping portion, which overlaps with the first transverse overlapping portion to form a transverse overlapping portion.

2. The secondary battery according to claim 1, wherein The transverse overlapping portion has a closed shape surrounding the circumference of the insulating housing in a plane.

3. The secondary battery according to claim 1, wherein The transverse overlapping portion is provided in a center region in a height direction of the insulating housing.

4. The secondary battery according to claim 1, wherein The first lateral overlapping portion and the second lateral overlapping portion overlap in a thickness direction of the insulating housing and are bonded to each other by heat welding or bonding.

5. The secondary battery according to claim 1, wherein One side end portion of the upper insulating shell overlaps with the corresponding opposite side end portion to form a first longitudinal overlapping portion, One side end portion of the lower insulating shell overlaps with the corresponding opposite side end portion to form a second longitudinal overlapping portion.

6. The secondary battery according to claim 5, characterized in that The first longitudinal overlapping portion and the second longitudinal overlapping portion are correspondingly arranged on one side of the insulating shell up and down to intersect with the transverse overlapping portion in a "cross" shape.

7. The secondary battery according to claim 5, characterized in that The transverse overlapping portion has a predetermined height, which is formed by overlapping the first transverse overlapping portion and the second transverse overlapping portion, and the height is greater than a predetermined degree of overlapping width of the first longitudinal overlapping portion and the second longitudinal overlapping portion.

8. The secondary battery according to claim 1, wherein One of the first lateral overlapping portion and the second lateral overlapping portion is extended by a bending area, and the bending area is bent to a predetermined degree toward the outside of the insulating shell so that the inner surface of the insulating shell forms a plane at the joint part of the first lateral overlapping portion and the second lateral overlapping portion.

9. The secondary battery according to claim 1, wherein The first transverse overlapping portion comprises: a first protruding rib protruding toward the outside of the insulating housing, wherein a plurality of the first protruding ribs are arranged at predetermined intervals along an extending direction of the first transverse overlapping portion; and A first rib groove is formed between a pair of adjacent first protruding ribs, and the first rib grooves and the first protruding ribs are alternately and repeatedly arranged along the extending direction.

10. The secondary battery according to claim 9, wherein The second transverse overlapping portion comprises: a second protruding rib, a plurality of the second protruding ribs being spaced apart at predetermined intervals along an extending direction of the second lateral overlapping portion and engaging with the first rib groove; and A second rib groove is formed between a pair of adjacent second protruding ribs and engages with the first protruding rib.

11. The secondary battery according to claim 1, wherein The first lateral overlapping portion is formed by bending the lower end region of the upper insulating shell. The second lateral overlapping portion is formed by bending the upper end region of the lower insulating shell to correspond to the first lateral overlapping portion, The transverse overlapping portion is formed by overlapping the bent portions of the first transverse overlapping portion and the second transverse overlapping portion up and down.

12. The secondary battery according to claim 11, wherein The first transverse overlapping portion is formed by bending the lower end region of the upper insulating shell toward the outside of the inner space. The second transverse overlapping portion is formed by bending an upper end region of the lower insulating housing toward an outside of the inner space to correspond to the first transverse overlapping portion.

13. The secondary battery according to claim 11, wherein At least a portion of the transverse overlapping portion is bent toward the outer surface of the insulating housing after the first transverse overlapping portion and the second transverse overlapping portion are joined.

14. The secondary battery according to claim 13, wherein: The lateral overlapping portion is formed by being divided at a position where the surfaces of the insulating housing meet and has a predetermined gap.

15. The secondary battery according to claim 1, wherein The upper insulating shell includes an upper portion for sealing the upper side of the electrode assembly, and at least one of a first electrode channel, a second electrode channel, an exhaust port channel, and an injection port channel is provided on the upper portion. The lower insulating case includes a lower portion for closing a lower side of the electrode assembly, and an electrolyte flow hole is provided in the lower portion.

16. The secondary battery according to claim 1, wherein The insulating housing is formed of a plate of insulating plastic material having a predetermined thickness.

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