Pouch-type battery

Abstract

Provided is a pouch-type battery including: an electrode assembly including a first electrode, a second electrode, and a separator; a pouch accommodating the electrode assembly such that at least a portion of the first electrode and the second electrode are exposed to the outside of the pouch; and a protective tape attached to a surface of the pouch and covering at least a portion of the sealed portion of the pouch. The protective belt includes a first fixing portion and a second fixing portion each extending from a lower end of the protective belt, an end of the first fixing portion being disposed on a bottom surface of the pouch, and the second fixing portion covering at least a portion of the first fixing portion.

Description

[0001] Cross-references to related applications

[0002] This application claims priority to and the benefit of Korean Patent Application No. 10-2024-0035979, filed on March 14, 2024, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0003] One or more embodiments relate to a pouch-type battery. Background Art

[0004] Secondary batteries can be charged and discharged multiple times, allowing for repeated use. They are used as energy sources for mobile devices, electric vehicles, hybrid vehicles, electric bicycles, uninterruptible power supplies, and the like. Depending on the type of external device in which the secondary battery is used, the secondary battery may be configured as a single battery or as a module in which multiple battery cells are connected and combined into a single unit. Summary of the Invention

[0005] One or more embodiments include a pouch-type battery including a protective tape having a first fixing portion and a second fixing portion disposed on a bottom surface of the pouch. One or more embodiments include a pouch-type battery in which the second fixing portion is disposed so as not to overlap with an insulating portion on one side of the pouch.

[0006] Additional aspects will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the presented embodiments of the disclosure.

[0007] According to one or more embodiments, a pouch-type battery includes: an electrode assembly including a first electrode, a second electrode, and a separator; a pouch accommodating the electrode assembly, wherein at least a portion of the first electrode and at least another portion of the second electrode are exposed to the outside of the pouch; and a protective tape attached to a surface of the pouch and covering at least a portion of a sealed portion of the pouch, wherein the protective tape includes a first fixing portion and a second fixing portion each extending from a lower end of the protective tape, an end portion of the first fixing portion is arranged on a bottom surface of the pouch, and the second fixing portion covers the first fixing portion.

[0008] The first fixing portion and the second fixing portion may each be provided in plural.

[0009] The plurality of first fixing portions may extend in opposite directions on the bottom surface of the bag.

[0010] The plurality of second fixing portions may extend in a direction intersecting a direction in which the plurality of first fixing portions extend.

[0011] The protective tape may further include an insulating portion covering the sealing portion on a side surface of the bag, and an end portion of the second fixing portion may be disposed on the side surface of the bag where the insulating portion is disposed.

[0012] The second fixing portion may be arranged not to overlap with the insulating portion on a side surface of the bag.

[0013] The insulating portion may include a slope structure such that the insulating portion does not overlap with the second fixing portion.

[0014] The second fixing portion may include a slope structure such that the second fixing portion does not overlap with the insulating portion.

[0015] The insulating portion and the second fixing portion may be spaced apart from each other on a side surface of the bag.

[0016] The second fixing portion may include a 2-1 fixing portion covering the first fixing portion on a bottom surface of the bag and a 2-2 fixing portion arranged on a side surface of the bag.

[0017] The 2-2 fixing portion may be arranged so as not to overlap with the insulating portion on the side surface of the bag. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and other aspects, features and advantages of certain embodiments of the present disclosure will become more apparent from the following description taken in conjunction with the accompanying drawings.

[0019] Figure 1 is a perspective view of a pouch-type battery according to an embodiment;

[0020] Figure 2 is an assembly diagram of a pouch-type battery according to an embodiment;

[0021] Figure 3 is a view for describing a sealing portion of a pouch-type battery according to an embodiment;

[0022] Figure 4 is a plan view of a protective tape according to an embodiment;

[0023] Figure 5 is a perspective view of a pouch-type battery to which a protective tape is attached according to an embodiment;

[0024] Figure 6 is a perspective view showing a portion of a pouch-type battery according to a comparative example;

[0025] Figure 7 is a perspective view showing a portion of a pouch-type battery according to a comparative example;

[0026] Figure 8 is a perspective view showing a state in which a first fixing portion is arranged on a bottom surface of a bag according to an embodiment;

[0027] Figure 9 A perspective view showing a second fixing portion covering a first fixing portion according to an embodiment;

[0028] Figure 10 is a conceptual diagram for describing a slope structure included in a guard band according to an embodiment; and

[0029] Figure 11 is a conceptual diagram for describing a slope structure included in a guard band according to an embodiment. DETAILED DESCRIPTION

[0030] Reference will now be made in detail to embodiments, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout. In this regard, the embodiments may take different forms and should not be construed as limited to the description set forth herein. Accordingly, the embodiments are described below solely with reference to the accompanying drawings to illustrate various aspects of the present specification. As used herein, the term "and / or" includes any and all combinations of one or more of the associated enumerated items.

[0031] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The terms and words used in the above-mentioned present specification and claims should not be interpreted as being limited to the ordinary meaning or dictionary meaning, but should be interpreted as meanings and concepts consistent with the technical ideas of the present disclosure based on the concept that the inventors can appropriately define the terms to describe their invention in the best way. Therefore, it should be understood that the configurations shown in the drawings and the embodiments described in this specification are only the most preferred embodiments of the present disclosure and do not represent all technical ideas of the present disclosure, so that various equivalents and modifications that replace them may exist when submitting this application. If used in this article, "including" and / or "comprising" indicate the existence of the shapes, numbers, steps, operations, components, parts and / or these groups mentioned, and do not exclude the existence or addition of one or more different shapes, numbers, operations, components, parts and / or groups. If describing an embodiment of the present disclosure, "can" or "may" include "one or more embodiments of the present disclosure".

[0032] In order to help understand the present disclosure, the accompanying drawings are not shown according to actual scale, but the dimensions of some components may be exaggerated. In different embodiments, the same reference numerals may be given to the same components.

[0033] The statement that two comparison objects are "the same" as each other may mean that they are "substantially the same" as each other. Thus, the case where they are "substantially the same" as each other may include the case where they have a deviation that is considered to be low (e.g., a deviation of 5% or less). If a uniform parameter is uniform within a predetermined area, this may mean that it is uniform from an average perspective.

[0034] Although the terms "first", "second", etc. may be used to describe various components, these components are not limited by these terms. These terms are only used to distinguish one component from other components, and unless there is a special statement to the contrary, the first component may be the second component.

[0035] Throughout the specification, and unless specifically stated otherwise, each component may be in the singular or the plural.

[0036] If a component is arranged on the "top portion (or bottom portion)" of another component or "on (or under)" another component, this may mean not only a case where the component is arranged adjacent to the top surface (or bottom surface) of the other component, but also that another component may be interposed between the other component and the component arranged on (or under) the other component.

[0037] If a component is described as being “linked,” “coupled,” or “connected” to another component, it should be understood that the components are directly connected or connectable to each other, but another component may be “interposed” between the components, or the components may be “linked,” “coupled,” or “connected” to each other through another component. If a part is electrically coupled to another part, this may include not only a case where they are directly connected to each other, but also a case where they are connected with another element in between.

[0038] Throughout the specification, unless otherwise specifically stated, "A and / or B" may mean A, B, or A and B. That is, "and / or" may include all or any combination of the listed items. "C to D" may mean at least C but no more than D, unless otherwise specifically stated.

[0039] Hereinafter, a pouch-type battery according to an embodiment will be described with reference to the accompanying drawings.

[0040] Figure 1 is a perspective view of a pouch-type battery 1 according to an embodiment. Figure 2 FIG. 1 is an assembly diagram of a pouch-type battery 1 according to an embodiment.

[0041] refer to Figure 1 and Figure 2 According to an embodiment, a pouch-type battery 1 may include an electrode assembly 20. The electrode assembly 20 may include a negative electrode plate, a positive electrode plate, and a separator disposed between the negative and positive electrode plates. A negative electrode tab electrically connected to an uncoated portion of the negative electrode may be provided on the negative electrode plate, and a positive electrode tab electrically connected to an uncoated portion of the positive electrode may be provided on the positive electrode plate. The negative electrode tab may be a first electrode 21. The positive electrode tab may be a second electrode 22.

[0042] The pouch-type battery 1 according to the embodiment may include a pouch 30 configured to accommodate the electrode assembly 20. That is, the electrode assembly 20 may be accommodated inside the pouch 30. At least a portion of the first electrode 21 and the second electrode 22 may be exposed to the outside of the pouch 30. The first electrode 21 and the second electrode 22 exposed to the outside of the pouch 30 may be electrically connected to the protection circuit module 10 (see later). Figure 3 describe).

[0043] The bag 30 according to the embodiment may be sealed by a sealing portion 31 provided at the edge of the bag 30 and meeting each other when the electrode assembly 20 is accommodated in the interior of the bag 30. In this case, the bag 30 may be sealed in a state where a tab film (not shown) is arranged between the sealing portions 31. The sealing portion 31 of the bag 30 may include a thermosetting material. The sealing portion 31 of the bag 30 may be sealed by adhering thermosetting layers to each other. However, the foregoing description of the structure in which the bag 30 accommodates the electrode assembly 20 and the structure in which the bag 30 is sealed is merely an example, and the present disclosure is not limited in this regard.

[0044] Figure 3 3 is a view for describing a sealing portion 31 of a pouch-type battery 1 according to an embodiment.

[0045] refer to Figures 1 to 3 , the pouch type battery 1 according to the embodiment may include a pouch 30 accommodating the electrode assembly 20 and sealed by sealing portions 31 meeting each other. The pouch 30 may accommodate the electrode assembly 20 and may be sealed by sealing portions 31 meeting each other.

[0046] A pouch-type battery 1 according to an embodiment may include a protection circuit module 10 and a connector 11. The protection circuit module 10 may be disposed on the top portion of the pouch-type battery 1. The top portion of the pouch-type battery 1 may be a direction in which at least a portion of the first electrode 21 and the second electrode 22 are exposed to the outside of the pouch 30. The protection circuit module 10 may be electrically connected to the first electrode 21 and the second electrode 22 exposed upward from the pouch 30. The upward direction may be the first direction z shown in the drawings.

[0047] The connector 11 according to the embodiment can be electrically connected to the protection circuit module 10. The connector 11 can also be electrically connected to an external device (not shown). Therefore, the connector 11 can electrically connect the pouch-type battery 1 to the external device. The protection circuit module 10 can control the output of the electrical energy exchanged between the connector 11 and the pouch-type battery 1. For example, the protection circuit module 10 can control the charging and discharging of the pouch-type battery 1. However, the arrangement and function of the protection circuit module 10 and the connector 11 are not limited to the foregoing description.

[0048] The sealing portion 31 of the bag 30 according to the embodiment may be folded to one side of the surface 300 of the bag 30. Herein, the sealing portion 31 may be an adhesive portion of the bag 30 formed on the opposite side of the pouch-type battery 1. For example, the sealing portion 31 may be folded onto the side surface 301 of the bag 30. The sealing portion 31 may be folded toward the side surface 301 of the bag 30. Herein, the side surface 301 of the bag 30 may be a surface 300 of the bag 30 formed in the second direction y among the surface 300 of the pouch-type battery 1. The sealing portion 31 may be folded in the second direction y. However, the foregoing description of the arrangement of the sealing portion 31 is merely an example, and the present disclosure is not limited in this regard.

[0049] The sealed portion 31 of the bag 30 may be covered with a protective tape 40 , which will be described below.

[0050] Figure 4 is a plan view of a protective tape 40 according to an embodiment. Figure 5 is a perspective view of a pouch-type battery 1 to which a protective tape 40 is attached according to an embodiment.

[0051] refer to Figures 3 to 5 According to an embodiment, the pouch-type battery 1 may include a protective tape 40. The protective tape 40 may be attached to the surface 300 of the pouch 30. The protective tape 40 may cover at least a portion of the surface 300 of the pouch 30. The protective tape 40 may cover at least a portion of the sealed portion 31 of the pouch 30. The sealed portion 31 of the pouch 30 covered by the protective tape 40 may be arranged on the opposite side of the side surface 301 of the pouch 30. The sealed portion 31 arranged on the opposite side of the side surface 301 of the pouch 30 may be folded toward the side surface 301 of the pouch 30. The protective tape 40 may include an insulating material to provide insulation for the sealed portion 31. However, the function of the protective tape 40 is not limited in this regard.

[0052] The protective tape 40 may be attached to the surface of various secondary batteries other than the pouch-type battery 1. For example, the protective tape 40 may be attached to the surface of a cylindrical battery or a prismatic battery.

[0053] The protective tape 40 according to the embodiment may include an insulating portion 41 configured to cover the sealing portion 31 of the bag 30. The protective tape 40 may include the insulating portions 41 arranged at opposite ends. For example, based on Figure 4 In the plan view of the protective tape 40, the insulating portion 41 included in the protective tape 40 may be arranged at opposite ends in the third direction x. As such, the insulating portion 41 may be arranged at opposite ends in the third direction x. Figure 5The insulating portion 41 may be arranged on the side surface 301 of the bag 30 at opposite ends in the third direction x. The insulating portion 41 may be referred to as a wing portion of the protective tape 40. When the protective tape 40 is attached to the surface 300 of the bag 30, the insulating portion 41 may be arranged on the sealing portion 31 of the bag 30. The insulating portion 41 may be arranged to overlap with the sealing portion 31 in the second direction y. That is, the second direction y may be the direction in which the sealing portion 31 of the bag 30 is folded. The insulating portion 41 may include an insulating material to provide insulation for the sealing portion 31. However, the arrangement of the insulating portion 41 is not limited to the foregoing description. For example, the insulating portion 41 may be arranged in a direction opposite to the sealing portion 31 on the surface 300 of the bag 30. More specifically, the sealing portion 31 may be arranged on one side surface of the bag 30, and the insulating portion 41 may be arranged on the side opposite to the one side surface.

[0054] The insulating portion 41 of the protective tape 40 can be provided for attachment to the surface of other types of secondary batteries other than the pouch-type battery 1. For example, the insulating portion 41 can provide insulation for a cylindrical battery. In this case, the insulating portion 41 can extend on the surface of the cylindrical battery in the longitudinal direction of the cylindrical battery.

[0055] According to an embodiment, the protective tape 40 may be formed longer than the left-right width of the bag 30. As shown in the figure, the left-right width of the bag 30 may be the dimension of the bag 30 in the third direction x. Therefore, the protective tape 40 may be formed larger than the dimension of the bag 30 in the third direction x, and the protective tape 40 may cover the entire side of the bag 30. Furthermore, the protective tape 40 may cover the entire side of the bag 30 and at least a portion of the other side of the bag 30 opposite the one side. The protective tape 40 may also cover the entire side of the bag 30, while at least a portion of the other side opposite the one side is not covered by the protective tape 40 and is exposed. The other side of the bag 30 exposed by the protective tape 40 may be at least a portion of the side surface 301 of the bag 30. The other side of the bag 30 exposed by the protective tape 40 may be the surface 300 of the bag 30 in the direction in which the insulating portion 41 is folded.

[0056] refer to Figure 5 , the protective tape 40 may include insulating portions 41 arranged at opposite ends in the third direction x. Return to Reference Figures 3 to 5 , the protective tape 40 may be attached along one side of the bag 30, and one of the insulating portions 41 may be arranged on the other side opposite to the one side. When the protective tape 40 is attached to the surface 300 of the bag 30, the insulating portion 41 may be arranged on the side surface 301 of the bag 30 in the opposite direction. The insulating portion 41 may be arranged so as not to overlap with the second fixing portion 60. The detailed configuration of the insulating portion 41 that does not overlap with the second fixing portion 60 will be described below.

[0057] The protective tape 40 according to the embodiment may include an upper end fixing portion 42 (see Figure 10and Figure 11 ) and side fixing portions 43. The upper fixing portion 42 may extend from the top portion of the protective tape 40. The upper fixing portion 42 may include a first upper fixing portion 421 and a second upper fixing portion 422 spaced apart from each other in the third direction x. The side fixing portions 43 may extend from at least a portion of the insulating portion 41. The upper fixing portion 42 and the side fixing portions 43 may fix the relative positions of the bag 30 and the protective tape 40 so that the protective tape 40 can be stably fixed to the surface 300 of the bag 30. However, the functions and arrangements of the upper fixing portion 42 and the side fixing portions 43 are not limited to the foregoing description.

[0058] refer to Figure 4 According to an embodiment, the protective tape 40 may include a first fixing portion 50 extending from its lower end. The first fixing portion 50 may extend from the lower end of the protective tape 40 in a direction opposite to the first direction z. There may be multiple first fixing portions 50. For example, there may be two first fixing portions 50. The multiple first fixing portions 50 may be spaced apart from each other on the lower end of the protective tape 40. When the protective tape 40 is attached to the surface 300 of the bag 30, the first fixing portion 50 may be arranged on the lower end of the bag 30. Return to Reference Figures 3 to 5 , the first fixing portion 50 may extend in the third direction x on the bottom surface 302 of the bag 30. That is, the end of the first fixing portion 50 may be arranged on the bottom surface 302 of the bag 30, and the first fixing portion 50 may be attached to the bottom surface 302 of the bag 30. The bottom surface 302 of the bag 30 may be the surface 300 of the bag 30 formed on the end of the bag 30 opposite to the end on which the protective circuit module 10 is arranged. However, the arrangement of the first fixing portion 50 is not limited to the foregoing description.

[0059] The first fixing portion 50 of the protective tape 40 may be attached to the lower end of a secondary battery of a different type from the pouch-type battery 1. For example, the first fixing portion 50 may be attached to the lower end of a cylindrical battery.

[0060] If there are multiple first fixing portions 50 (according to some embodiments), the multiple first fixing portions 50 may extend in opposite directions on the bottom surface 302 of the bag 30. For example, two first fixing portions 50 may extend in opposite directions on the bottom surface 302 of the bag 30. The multiple first fixing portions 50 may extend in one direction on the bottom surface 302 of the bag 30 so as to be adjacent to each other. However, the arrangement and number of the first fixing portions 50 are not limited to the foregoing description.

[0061] refer to Figure 4According to an embodiment, the protective tape 40 may include a second fixing portion 60 extending from its lower end. The second fixing portion 60 may extend from the lower end of the protective tape 40 in a direction opposite to the first direction z. There may be multiple second fixing portions 60. For example, there may be two second fixing portions 60. The multiple second fixing portions 60 may be spaced apart from each other at the lower end of the protective tape 40. The multiple second fixing portions 60 may be arranged between the first fixing portions 50 at the lower end of the protective tape 40. The multiple second fixing portions 60 may be arranged between the multiple first fixing portions 50 at the lower end of the protective tape 40. For example, two first fixing portions 50 may be spaced apart from each other at the lower end of the protective tape 40 by a predetermined distance, and the two second fixing portions 60 may be arranged between the two first fixing portions 50. However, the number of second fixing portions 60 and their arrangement relationship with the first fixing portions 50 are not limited to the foregoing description.

[0062] The second fixing portion 60 of the protective tape 40 may be attached to the lower end of a secondary battery different from the pouch-type battery 1. For example, the second fixing portion 60 may be attached to the lower end of a cylindrical battery.

[0063] Return Reference Figures 3 to 5 , the second fixing portion 60 may extend in a direction intersecting the direction in which the first fixing portion 50 extends. For example, the second fixing portion 60 may extend in a second direction y on the bottom surface 302 of the bag 30. The second direction y may be a direction intersecting the first direction z and the direction in which the first fixing portion 50 extends on the bottom surface 302 of the bag 30. The second direction y in which the second fixing portion 60 extends on the bottom surface 302 of the bag 30 may be the thickness direction of the bag 30.

[0064] The second fixing portion 60 may extend in the second direction y on the bottom surface 302 of the bag 30 and along the surface 300 of the bag 30, and an end portion of the second fixing portion 60 may be arranged on the side surface 301 of the bag 30. The side surface 301 of the bag 30 on which the end portion of the second fixing portion 60 is arranged may be a side of the bag 30 in the direction in which the sealing portion 31 is folded. The side surface 301 of the bag 30 on which the end portion of the second fixing portion 60 is arranged may be a side of the bag 30 on which the insulating portion 41 is arranged. The end portion of the second fixing portion 60 may be arranged on the side of the bag 30 on which the insulating portion 41 is arranged.

[0065] If the end of the second fixing portion 60 according to the embodiment is arranged on the side surface 301 of the bag 30, at least a portion of the second fixing portion 60 extends from the side surface 301 of the bag 30 in the upward direction of the bag 30. That is, if the end of the second fixing portion 60 is arranged on the side surface 301 of the bag 30, at least a portion of the second fixing portion 60 extends from the side surface 301 of the bag 30 in the first direction z. However, the number of the second fixing portions 60 and the arrangement of the ends of the second fixing portions 60 are not limited to the foregoing description.

[0066] Return Reference Figure 4 According to an embodiment, the second fixing portion 60 may include a 2-1 fixing portion 61 and a 2-2 fixing portion 62. The 2-2 fixing portion 62 may extend from the end of the 2-1 fixing portion 61 in a direction opposite to the first direction z. The 2-2 fixing portion 62 may be formed to have a width narrower than that of the 2-1 fixing portion 61. The widths of the 2-2 fixing portion 62 and the 2-1 fixing portion 61 may be the widths in the third direction x. The 2-2 fixing portion 62 may extend from a portion of the end of the 2-1 fixing portion 61. If the 2-2 fixing portion 62 extends from a portion of the end of the 2-1 fixing portion 61, the 2-2 fixing portion 62 is spaced apart from one end of the 2-1 fixing portion 61. The 2-2 fixing portion 62 may extend to the 2-1 fixing portion 61 in the first direction z at a position spaced apart from the adjacent first fixing portion 50. If there are a plurality of second fixing portions 60 , a plurality of 2-2nd fixing portions 62 may be arranged adjacent to each other in opposite directions on the 2-1st fixing portion 61 .

[0067] Return Reference Figure 4 and Figure 5According to an embodiment, at least a portion of the second fixing portion 60 may be disposed on the bottom surface 302 of the bag 30. The portion of the second fixing portion 60 disposed on the bottom surface 302 of the bag 30 may be the 2-1 fixing portion 61. That is, the 2-1 fixing portion 61 may be disposed on the bottom surface 302 of the bag 30. At least a portion of the second fixing portion 60 may be disposed on the side surface 301 of the bag 30. That is, the portion of the second fixing portion 60 disposed on the side surface 301 of the bag 30 may be the 2-2 fixing portion 62, and the 2-2 fixing portion 62 may be disposed on the bottom surface 302 of the bag 30. The second fixing portion 60 extending from the bottom of the protective tape 40 may include the 2-1 fixing portion 61 extending in the second direction y on the bottom surface 302 of the bag 30, and the 2-2 fixing portion 62 connected to the 2-1 fixing portion 61 and extending in the first direction z on the side surface 301 of the bag 30. However, the arrangement of the 2-1st fixing portion 61 and the 2-2nd fixing portion 62 is not limited in this regard. For example, at least a portion of the 2-1st fixing portion 61 may be arranged on the side surface 301 of the bag 30, or at least a portion of the 2-2nd fixing portion 62 may be arranged on the bottom surface 302 of the bag 30. Therefore, the arrangement of the 2-1st fixing portion 61 and the 2-2nd fixing portion 62 is not limited to the above description.

[0068] The second fixing portion 60 can be used to fix the first fixing portion 50 to the bottom surface 302 of the bag 30. Before describing the function of the second fixing portion 60 in detail, the function of the first fixing portion 50 will be described.

[0069] Figure 6 is a perspective view showing a portion of a pouch-type battery 1 a according to a comparative example. Figure 7 is another perspective view showing a portion of a pouch-type battery 1 a according to a comparative example.

[0070] refer to Figure 6 and Figure 7 , the pouch-type battery 1 a according to the comparative example may be a pouch-type battery that does not include the above-described first fixing portion 50 . Figure 6 The pouch-type battery may be attached to the protective tape 40 but not to the first fixing portion 50. Figure 7 It is shown that the bottom surface 302 of the comparative example is deformed after the activation process.

[0071] More specifically, after the protective tape 40 is attached to the pouch 30, the activation process of the pouch-type battery 1a may be performed. The activation process of the pouch-type battery 1a may include a process of discharging gas from the inside of the pouch 30 to the outside of the pouch 30. If the gas inside the pouch 30 is discharged during the activation process of the pouch-type battery 1a, a negative pressure may be formed inside the pouch 30. And if a negative pressure is formed inside the pouch 30, the surface 300 of the pouch 30 may deform. If a negative pressure is formed inside the pouch 30, the portion of the surface 300 of the pouch 30 with a small area may not have a high resistance to deformation. For example, the bottom surface 302 of the pouch 30 may have an area smaller than that of the side surface 301. Therefore, the bottom surface 302 of the pouch 30 may deform due to the negative pressure formed inside the pouch 30. Because of this, during the activation process of the pouch-type battery 1a, the bottom surface 302S of the pouch 30 may be drawn toward the inside of the pouch 30. Specifically, during the activation process of the pouch-type battery 1a, the bottom surface 302S of the pouch 30 may be concave toward the inside of the pouch 30. However, the cause of the deformation of the bottom surface 302S of the pouch 30 is not limited to the aforementioned description. For example, after the activation process of the pouch-type battery 1a, during the charging and / or discharging process of the pouch-type battery 1a, the bottom surface 302S of the pouch 30 may be concave toward the inside of the pouch 30. If the bottom surface 302S of the pouch 30 is concave inward, the appearance of the pouch-type battery 1a may be deteriorated. Further, if the bottom surface 302S of the pouch 30 is concave inward, the volumetric efficiency of the pouch-type battery 1a may be deteriorated.

[0072] Figure 8 3 is a perspective view illustrating a state in which the first fixing portion 50 is arranged on the bottom surface 302 of the bag 30 according to an embodiment of the present disclosure.

[0073] refer to Figure 8 The first fixing portion 50 can be attached to the bottom surface 302 of the bag 30 so that the first fixing portion 50 supports the bottom of the bag 30. The first fixing portion 50 can thereby prevent the bottom surface 302 of the bag 30 from being recessed inward. In other words, the first fixing portion 50 can prevent the bottom surface 302 of the bag 30 from being sucked inward. However, the function of the first fixing portion 50 is not limited in this regard.

[0074] Figure 9 2 is a perspective view illustrating the second fixing portion 60 covering the first fixing portion 50 according to an embodiment of the present disclosure.

[0075] refer to Figure 8 and Figure 9, the second fixing portion 60 according to an embodiment may cover at least a portion of the first fixing portion 50. The second fixing portion 60 may cover at least a portion of the first fixing portion 50, such that the first fixing portion 50 is fixed to the bottom surface 302 of the bag 30. Therefore, the second fixing portion 60 may fix the first fixing portion 50 to the bottom surface 302 of the bag 30, such that the first fixing portion 50 prevents the bottom surface 302 of the bag 30 from being recessed inward.

[0076] The 2-1st fixing portion 61 according to an embodiment may cover the first fixing portion 50 on the lower end of the bag 30. The lower end of the bag 30 may be the bottom surface 302 of the bag 30. The first fixing portion 50 may be disposed between the bottom surface 302 of the bag 30 and the 2-1st fixing portion 61. However, the arrangement and number of the 2-1st fixing portion 61 are not limited to the foregoing description.

[0077] The 2-2nd fixing portion 62 according to an embodiment may be arranged on the side surface 301 of the bag 30. The 2-2nd fixing portion 62 may support the 2-1st fixing portion 61 at one side thereof so that the 2-1st fixing portion 61 fixes the first fixing portion 50. The 2-2nd fixing portion 62 may be fixed to the side surface 301 of the bag 30 to fix the 2-1st fixing portion 61. However, the arrangement and number of the 2-2nd fixing portion 62 are not limited to the foregoing description.

[0078] The second fixing portion 60 may extend in a direction intersecting the direction in which the first fixing portion 50 extends. More specifically, the first fixing portion 50 may extend on the bottom surface 302 of the bag 30 in a direction parallel to the third direction x. The 2-1st fixing portion 61 may extend in a second direction y on the bottom surface 302 of the bag 30. As shown in the figure, the second direction y may intersect with the third direction x. The 2-2nd fixing portion 62 may extend in a first direction z along the side surface 301 of the bag 30. As shown in the figure, the first direction z may intersect with the third direction x. Since the second fixing portion 60 extends in a direction intersecting with the direction in which the first fixing portion 50 extends, the second fixing portion 60 can effectively secure the first fixing portion 50 to the bag 30.

[0079] The insulating portion 41 and the second fixing portion 60 may be arranged so as not to overlap each other on one side of the pouch 30. Furthermore, the insulating portion 41 and the second fixing portion 60 may be arranged so as not to overlap each other in the second direction y on the side surface 301 of the pouch 30. The second direction y may be the thickness direction of the pouch-type battery 1. If the insulating portion 41 and the second fixing portion 60 are arranged so as not to overlap each other in the second direction y on the side surface 301 of the pouch 30, the thickness of the pouch-type battery 1 may not increase. If the insulating portion 41 and the second fixing portion 60 are arranged so as not to overlap each other in the second direction y on the side surface 301 of the pouch 30, the pouch-type battery 1 may have a high volumetric efficiency.

[0080] If the protective tape 40 is attached to the bag 30, the insulating portion 41 and the 2-2 fixing portion 62 may be arranged on the same surface 300 of the bag 30. For example, the insulating portion 41 and the 2-2 fixing portion 62 may be arranged on the side surface 301 of the bag 30. The insulating portion 41 and the 2-2 fixing portion 62 may be arranged so as not to overlap with each other on the side surface 301 of the bag 30. If the insulating portion 41 and the 2-2 fixing portion 62 are arranged so as not to overlap with each other on the side surface 301 of the bag 30, the pouch-type battery 1 may have a high volumetric efficiency. However, the arrangement and relationship of the insulating portion 41 and the 2-2 fixing portion 62 are not limited to the foregoing description.

[0081] According to an embodiment, the insulating portion 41 and the second fixing portion 60 may be spaced apart from each other by a predetermined distance on one side of the pouch 30. The 2-2nd fixing portion 62 may be spaced apart from the insulating portion 41 by a predetermined distance so as not to overlap with the insulating portion 41 on the side surface 301 of the pouch 30. If the 2-2nd fixing portion 62 is spaced apart from the insulating portion 41, this may mean that the 2-2nd fixing portion 62 is spaced apart from the insulating portion 41 by a predetermined distance at the end of the 2-1st fixing portion 61 in a direction away from the insulating portion 41. The direction away from the insulating portion 41 at the end of the 2-1st fixing portion 61 may be toward the center of the pouch-type battery 1 in the third direction x. The position of the 2-2nd fixing portion 62 relative to the 2-1st fixing portion 61 may be toward the center of the pouch-type battery 1 in the third direction x. Therefore, the 2-2nd fixing portion 62 may be spaced apart from the insulating portion 41 in an inward direction and, thus, not overlap with the insulating portion 41 on the side surface 301 of the pouch 30.

[0082] If there are multiple second fixing portions 60, such as two second fixing portions 60, according to an embodiment of the present disclosure, the multiple second fixing portions 60 may be arranged on opposite sides of the lower end of the bag 30 in the first direction z. If the 2-2nd fixing portion 62 included in each of the multiple second fixing portions 60 extends from the 2-1st fixing portion 61, the respective 2-2nd fixing portions 62 may be spaced apart from each other in opposite directions on the side surface 301 of the bag 30. However, the arrangement of the 2-2nd fixing portion 62 and the 2-1st fixing portion 61 is not limited to the aforementioned description. For example, the 2-2nd fixing portion 62 may be arranged in various ways so that the 2-2nd fixing portion 62 does not overlap with the insulating portion 41 on the side surface 301 of the bag 30.

[0083] If the 2-2 fixing portions 62 are spaced too far apart on the side surface 301 of the bag 30, the function of the 2-2 fixing portions 62 in fixing the 2-1 fixing portions 61 may be reduced. Hereinafter, a slope structure will be described that is configured so that the 2-2 fixing portions 62 effectively fix the 2-1 fixing portions 61 without being spaced too far apart on the side surface 301 of the bag 30.

[0084] Figure 10 is a conceptual diagram for describing a slope structure 42T included in a guard tape 40 according to an embodiment of the present disclosure. Figure 11 is a conceptual diagram for describing a slope structure 62T included in the second fixing portion 60 according to other embodiments of the present disclosure. Figure 10 and Figure 11 Show Figure 9 Magnified view of area A in FIG.

[0085] refer to Figure 10 and Figure 11 According to an embodiment, the upper fixing portion 42 of the insulating portion 41 may include a slope structure 42T. The slope structure 42T prevents overlap with the 2-2 fixing portion 62 of the second fixing portion 60. Therefore, due to the slope structure 42T, the insulating portion 41 can cover a large area of ​​the bag 30 on the side surface 301 while also being spaced apart from the second fixing portion 60. Furthermore, due to the slope structure 42T of the insulating portion 41, the 2-2 fixing portion 62 can effectively fix the 2-1 fixing portion 61 on the bottom surface 302 of the bag 30.

[0086] The second fixing portion 60 according to the embodiment may include a slope structure 62T to prevent overlapping with the upper end fixing portion 42 of the insulating portion 41. In particular, the 2-2nd fixing portion 62 may include a slope structure 62T to prevent overlapping with the upper end fixing portion 42 of the insulating portion 41. Due to the slope structure 62T, the 2-2nd fixing portion 62 may effectively fix the 2-1st fixing portion 61 while being spaced apart from the insulating portion 41.

[0087] Although the present disclosure has been described with reference to the examples shown in the accompanying drawings, it will be understood by those skilled in the art that various modifications and equivalent other examples may be derived from the shown examples.

[0088] The pouch-type battery according to the present disclosure can prevent deformation of the bottom surface of the pouch by a first fixing portion arranged on the bottom surface of the pouch. Also, the pouch-type battery according to the present disclosure can prevent deformation of the bottom surface of the pouch by a second fixing portion covering at least a portion of the first fixing portion.

[0089] The pouch-type battery according to the present disclosure may provide a miniaturized pouch-type battery because the second fixing portion is arranged not to overlap with the insulating portion of the pouch.

[0090] It should be understood that the embodiments described herein should be considered in a descriptive sense only and not for purposes of limitation. The description of features or aspects in each embodiment should generally be considered to be applicable to other similar features or aspects in other embodiments. Although one or more embodiments have been described with reference to the accompanying drawings, those skilled in the art will understand that various changes in form and details may be made therein without departing from the spirit and scope of the present disclosure as defined by the claims.

Claims

1. A pouch-type battery comprising: an electrode assembly comprising a first electrode, a second electrode, and a separator; a bag accommodating the electrode assembly, wherein at least a portion of the first electrode and at least a portion of the second electrode are exposed to the outside of the bag; as well as a protective tape attached to a surface of the bag and covering at least a portion of the sealed portion of the bag, wherein the protective tape comprises a first fixing portion and a second fixing portion each extending from a lower end of the protective tape, wherein an end portion of the first fixing portion is arranged on the bottom surface of the bag, and The second fixing portion covers at least a portion of the first fixing portion. 2 . The pouch type battery according to claim 1 , wherein a plurality of the first fixing portions and a plurality of the second fixing portions are provided. 3 . The pouch type battery according to claim 2 , wherein the plurality of first fixing portions extend in opposite directions on the bottom surface of the pouch. 4 . The pouch type battery according to claim 3 , wherein the plurality of second fixing portions extend in a direction intersecting a direction in which the plurality of first fixing portions extend.

5. The pouch type battery according to claim 1 , wherein the protective tape further comprises an insulating portion covering the sealing portion on a side surface of the pouch, and wherein an end portion of the second fixing portion is arranged on the side surface of the bag where the insulating portion is arranged. 6 . The pouch type battery according to claim 5 , wherein the second fixing portion is arranged not to overlap with the insulating portion on the side surface of the pouch. 7 . The pouch-type battery according to claim 6 , wherein the insulating portion comprises a slope structure such that the insulating portion does not overlap with the second fixing portion. 8 . The pouch-type battery according to claim 7 , wherein the second fixing portion comprises a slope structure such that the second fixing portion does not overlap with the insulating portion. 9 . The pouch type battery according to claim 8 , wherein the insulating portion and the second fixing portion are spaced apart from each other on the side surface of the pouch.

10. The pouch-type battery according to claim 6, wherein the second fixing portion comprises: a 2-1st fixing portion covering the first fixing portion on the bottom surface of the bag; as well as The 2-2 fixing portion is arranged on the side surface of the bag. 11 . The pouch type battery according to claim 10 , wherein the 2 - 2 fixing portion does not overlap with the insulating portion of the pouch on the side surface.

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