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 and benefit to Korean Patent Application No. 10-2024-0035979, filed on March 14, 2024, with the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference. Technical Field

[0003] One or more embodiments relate to pouch cells. Background Technology

[0004] Secondary batteries can be charged and discharged multiple times, thus enabling repeated use. They are used as energy sources for mobile devices, electric vehicles, hybrid vehicles, electric bicycles, uninterruptible power supplies, and more. Depending on the type of external device using the secondary battery, it can be configured as a single cell or as a module in which multiple individual cells are connected and combined into a single unit. Utility Model Content

[0005] One or more embodiments include a pouch-type battery, the pouch-type battery including a protective strap having a first fixing portion and a second fixing portion disposed on the bottom surface of the pouch. One or more embodiments include a pouch-type battery wherein the second fixing portion is arranged on one side of the pouch and does not overlap with the insulating portion.

[0006] Other aspects will be set forth in part in the description which follows, and will be apparent in part from the description, or may be learned by practicing the embodiments presented in this 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 containing the electrode assembly, wherein at least a portion of the first electrode and at least another portion of the second electrode are exposed outside the pouch; and a protective strip attached to the surface of the pouch and covering at least a portion of a sealed portion of the pouch, wherein the protective strip includes a first fixing portion and a second fixing portion, each extending from a lower end of the protective strip, an end of the first fixing portion disposed on a bottom surface of the pouch, and the second fixing portion covering the first fixing portion.

[0008] The first fixed part and the second fixed part can each be provided in multiples.

[0009] Multiple first fixing parts may extend in opposite directions on the bottom surface of the bag.

[0010] Multiple second fixed portions may extend in a direction that intersects with the direction in which multiple first fixed portions extend.

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

[0012] The second fixing part can be arranged on the side surface of the bag without overlapping the insulating part.

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

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

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

[0016] The second fixing part may include a 2-1 fixing part that covers the first fixing part on the bottom surface of the bag and a 2-2 fixing part that is arranged on the side surface of the bag.

[0017] The 2-2 fixing part ensures that it does not overlap with the insulating part on the side surface of the bag. Attached Figure Description

[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 This is a perspective view of a pouch-type battery according to an embodiment;

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

[0021] Figure 3 A view for illustrating the sealed portion of a pouch-type battery according to an embodiment;

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

[0023] Figure 5 A perspective view of a pouch-type battery with an attached protective strap according to an embodiment;

[0024] Figure 6 A perspective view showing a portion of the pouch cell according to the comparative example;

[0025] Figure 7 A perspective view showing a portion of the pouch cell according to the comparative example;

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

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

[0028] Figure 10 A conceptual diagram illustrating a ramp structure included in a protective strip according to an embodiment; and

[0029] Figure 11 This is a conceptual diagram used to describe a ramp structure included in a protective strip according to an embodiment. Detailed Implementation

[0030] Reference will now be made in detail to embodiments, examples of which are illustrated in the accompanying drawings, wherein the same reference numerals refer to the same elements throughout. In this regard, embodiments may take different forms and should not be construed as limited to the description set forth herein. Therefore, embodiments are described below merely with reference to the accompanying drawings to explain various aspects of this 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 this specification and claims should not be construed as limited to their ordinary or dictionary meanings, but should be interpreted as meanings and concepts consistent with the technical spirit of the present disclosure, based on the inventors' appropriate definition of the concepts of the terms to best describe their utility model. Therefore, it should be understood that the configurations shown in the drawings and the embodiments described in this specification are merely the most preferred embodiments of the present disclosure and do not represent all the technical ideas of the present disclosure, such that various equivalents and variations may exist to replace them at the time of filing this application. Where used herein, “comprising” and / or “including” refers to the presence of mentioned shapes, numbers, steps, operations, components, parts, and / or groups of these, and does not exclude the presence or addition of one or more different shapes, numbers, operations, components, parts, and / or groups. When describing embodiments of the present disclosure, “can” or “may” may include “one or more embodiments of the present disclosure”.

[0032] To aid in understanding this disclosure, the accompanying drawings are not shown to scale, but some components are enlarged in dimension. In different embodiments, the same reference numerals may be assigned to the same components.

[0033] The statement that two comparison objects are "identical" to each other can mean that they are "substantially identical." Therefore, the situation where they are "substantially identical" can include cases where they have deviations considered to be low (e.g., deviations of 5% or less). If a uniform parameter is uniform within a predetermined region, this can mean that it is uniform from an average perspective.

[0034] Although terms like "first," "second," etc., can be used to describe various components, these components are not limited to these terms. These terms are only used to distinguish one component from others, and unless otherwise specifically stated, a first component may be a second component.

[0035] Throughout the instruction manual, and unless otherwise specifically stated otherwise, each part may be singular or plural.

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

[0037] If a component is described as “linked,” “connected,” or “attached” to another component, it should be understood that these components are directly connected to or can be connected to each other, but the other component may be “between” the components, or the components may be “linked,” “connected,” or “attached” to each other through another component. If one part is electrically connected to another part, this includes not only cases where they are directly connected to each other, but also cases where they are connected and there is another element between them.

[0038] Throughout this 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] The pouch-type battery according to an embodiment will be described below with reference to the accompanying drawings.

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

[0041] refer to Figure 1 and Figure 2 The pouch cell 1 according to an embodiment 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 terminal may be provided in the negative electrode plate for electrical connection to an uncoated portion of the negative electrode, and a positive electrode terminal may be provided in the positive electrode plate for electrical connection to an uncoated portion of the positive electrode. The negative electrode terminal may be a first electrode 21. The positive electrode terminal may be a second electrode 22.

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

[0043] The bag 30 according to an embodiment can be sealed by sealing portions 31 provided at the edge of the bag 30 and meeting each other when the electrode assembly 20 is housed inside the bag 30. In this case, the bag 30 can be sealed with a tab film (not shown) arranged between the sealing portions 31. The sealing portions 31 of the bag 30 may comprise a thermosetting material. The sealing portions 31 of the bag 30 can be sealed by adhering thermosetting layers to each other. However, the foregoing description of the structure of the bag 30 housing the electrode assembly 20 and the structure of the bag 30 being sealed is merely illustrative, and this disclosure is not limited thereto.

[0044] Figure 3 This is a view used to describe the sealing portion 31 of the pouch-type battery 1 according to an embodiment.

[0045] refer to Figures 1 to 3 According to an embodiment, the pouch-type battery 1 may include a pouch 30 that houses the electrode assembly 20 and is sealed by sealing portions 31 that meet each other. The pouch 30 may house the electrode assembly 20 and may be sealed by sealing portions 31 that meet each other.

[0046] The 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 in 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 in an upward direction from the pouch 30. The upward direction may be the first direction z shown in the figures.

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

[0048] According to an embodiment, the sealing portion 31 of the bag 30 can be folded to one side of the surface 300 of the bag 30. Hereinafter, 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 can be folded onto the side surface 301 of the bag 30. The sealing portion 31 can be folded toward the side surface 301 of the bag 30. Hereinafter, the side surface 301 of the bag 30 may be the surface 300 of the bag 30 formed in the second direction y in the surface 300 of the pouch-type battery 1. The sealing portion 31 can be folded in the second direction y. However, the foregoing description of the arrangement of the sealing portion 31 is merely illustrative, and this disclosure is not limited thereto.

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

[0050] Figure 4 This is a plan view of the protective strip 40 according to an embodiment. Figure 5 This is a perspective view of a pouch-type battery 1 with a protective strap 40 attached according to an embodiment.

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

[0052] The protective strip 40 can be attached to the surface of various secondary batteries that are different from the pouch-type battery 1. For example, the protective strip 40 can be attached to the surface of a cylindrical battery or a prismatic battery.

[0053] The protective tape 40 according to an embodiment may include an insulating portion 41 configured to cover the sealing portion 31 of the bag 30. The protective tape 40 may include insulating portions 41 disposed at opposite ends. For example, based on... Figure 4 A plan view of the protective strip 40, including an insulating portion 41 within the protective strip 40, which may be arranged at opposite ends in a third direction x. Therefore, the insulating portion 41 may... Figure 5The insulating portion 41 is disposed on the side surface 301 of the bag 30 at opposite ends in a third direction x. The insulating portion 41 may be referred to as a wing portion of the protective strip 40. When the protective strip 40 is attached to the surface 300 of the bag 30, the insulating portion 41 may be disposed on the sealing portion 31 of the bag 30. The insulating portion 41 may be disposed to overlap the sealing portion 31 in a 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 disposed in the direction opposite to the sealing portion 31 on the surface 300 of the bag 30. More specifically, the sealing portion 31 may be disposed on one side surface of the bag 30, and the insulating portion 41 may be disposed on the side opposite to that side surface.

[0054] The insulating portion 41 of the protective strip 40 can be provided on the surface of other types of secondary batteries besides the pouch cell 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 strip 40 may be formed to be longer than the left-right width of the bag 30. As shown, the left-right width of the bag 30 may be the dimension of the bag 30 in the third direction x. Therefore, the protective strip 40 may be formed to be larger than the dimension of the bag 30 in the third direction x, and the protective strip 40 may cover the entire side of the bag 30. Moreover, the protective strip 40 may cover the entire side of the bag 30 and at least a portion of the opposite side of the bag 30. The protective strip 40 may also cover the entire side of the bag 30, while at least a portion of the opposite side is not covered by the protective strip 40 and is thus exposed. The other side of the bag 30 exposed by the protective strip 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 strip 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 strip 40 may include an insulating portion 41 disposed at opposite ends in a third direction x. (Return to Reference) Figures 3 to 5 The protective tape 40 can be attached along one side of the bag 30, and one of the insulating portions 41 can be arranged on the opposite side. When the protective tape 40 is attached to the surface 300 of the bag 30, the insulating portion 41 can be arranged in the opposite direction on the side surface 301 of the bag 30. The insulating portion 41 can 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] According to an embodiment, the protective strap 40 may include an upper fixing portion 42 (see...). Figure 10and Figure 11 The protective strap 40 includes a top fixing portion 42 and a side fixing portion 43. The top fixing portion 42 may extend from the top portion of the protective strap 40. The top fixing portion 42 may include a first top fixing portion 421 and a second top fixing portion 422 spaced apart from each other in a third direction x. The side fixing portion 43 may extend from at least a portion of the insulating portion 41. The top fixing portion 42 and the side fixing portion 43 secure the relative position of the bag 30 and the protective strap 40, such that the protective strap 40 is stably fixed to the surface 300 of the bag 30. However, the function and arrangement of the top fixing portion 42 and the side fixing portion 43 are not limited to the foregoing description.

[0058] refer to Figure 4 The protective strip 40 according to an embodiment 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 strip 40 in a direction opposite to the first direction z. There may be a plurality of first fixing portions 50. For example, there may be two first fixing portions 50. The plurality of first fixing portions 50 may be spaced apart from each other on the lower end of the protective strip 40. When the protective strip 40 is attached to the surface 300 of the bag 30, the first fixing portions 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 a third direction x on the bottom surface 302 of the bag 30. That is, the end of the first fixing portion 50 may be disposed 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 following surface 300 of the bag 30, which is formed on the end of the bag 30 opposite to the end on which the protection circuit module 10 is disposed. 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 strap 40 can be attached to the lower end of a secondary battery of a different type than the pouch battery 1. For example, the first fixing portion 50 can be attached to the lower end of a cylindrical battery.

[0060] (According to some embodiments) If there are multiple first fixing portions 50, 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 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 strip 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 strip 40 in a direction opposite to the first direction z. There may be a plurality of second fixing portions 60. For example, there may be two second fixing portions 60. The plurality of second fixing portions 60 may be spaced apart from each other at the lower end of the protective strip 40. The plurality of second fixing portions 60 may be arranged between first fixing portions 50 at the lower end of the protective strip 40. The plurality of second fixing portions 60 may be arranged between the plurality of first fixing portions 50 at the lower end of the protective strip 40. For example, two first fixing portions 50 may be spaced apart from each other by a predetermined distance at the lower end of the protective strip 40, and two second fixing portions 60 may be arranged between 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 strap 40 can be attached to the lower end of a secondary battery that is different from the pouch battery 1. For example, the second fixing portion 60 can be attached to the lower end of a cylindrical battery.

[0063] Return to 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 the 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 the end of the second fixing portion 60 may be disposed on the side surface 301 of the bag 30. The side surface 301 of the bag 30 on which the end of the second fixing portion 60 is disposed may be one 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 of the second fixing portion 60 is disposed may be one side of the bag 30 on which the insulating portion 41 is disposed. The end of the second fixing portion 60 may be disposed on the side of the bag 30 on which the insulating portion 41 is disposed.

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

[0067] Return to reference Figure 4 and Figure 5At least a portion of the second fixing portion 60 according to the embodiment may be disposed on the bottom surface 302 of the bag 30. A portion of the second fixing portion 60 disposed on the bottom surface 302 of the bag 30 may be a second-1 fixing portion 61. That is, the second-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, a portion of the second fixing portion 60 disposed on the side surface 301 of the bag 30 may be a second-2 fixing portion 62, and the second-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 strap 40 may include a second-1 fixing portion 61 extending in the second direction y on the bottom surface 302 of the bag 30 and a second-2 fixing portion 62 connected to the second-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 second-first fixing portion 61 and the second-second fixing portion 62 is not limited thereto. For example, at least a portion of the second-first fixing portion 61 may be arranged on the side surface 301 of the bag 30, or at least a portion of the second-second fixing portion 62 may be arranged on the bottom surface 302 of the bag 30. Therefore, the arrangement of the second-first fixing portion 61 and the second-second fixing portion 62 is not limited to the foregoing description.

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

[0069] Figure 6 A perspective view showing a portion of the pouch cell 1a according to the comparative example. Figure 7 Another perspective view showing a portion of the pouch cell 1a according to the comparative example.

[0070] refer to Figure 6 and Figure 7 According to the comparative example, the pouch cell 1a can be a pouch cell that does not include the first fixing part 50 described above. Figure 6 The pouch-type battery can be attached to the protective strap 40 but not to the first fixing part 50. Figure 7 As shown, the bottom surface 302 of the comparative example deforms after the activation process.

[0071] More specifically, after the protective tape 40 is attached to the bag 30, an activation process for the pouch-type battery 1a can be performed. The activation process for the pouch-type battery 1a may include a process of venting gas from the inside of the bag 30 to the outside of the bag 30. If gas is vented from the inside of the bag 30 during the activation process of the pouch-type battery 1a, a negative pressure may be formed inside the bag 30. And if a negative pressure is formed inside the bag 30, the surface 300 of the bag 30 may deform. If a negative pressure is formed inside the bag 30, the small-area portions of the surface 300 of the bag 30 may not have high resistance to deformation. For example, the bottom surface 302 of the bag 30 may have a smaller area than the side surface 301. Therefore, the bottom surface 302 of the bag 30 may deform due to the negative pressure formed inside the bag 30. As a result, during the activation process of the pouch-type battery 1a, the bottom surface 302S of the bag 30 may be drawn towards the interior of the bag 30. Specifically, in the activation process of the pouch battery 1a, the bottom surface 302S of the pouch 30 may be recessed toward the interior of the pouch 30. However, the reasons for the deformation of the bottom surface 302S of the pouch 30 are not limited to those described above. For example, after the activation process of the pouch battery 1a, during the charging and / or discharging process of the pouch battery 1a, the bottom surface 302S of the pouch 30 may be recessed toward the interior of the pouch 30. If the bottom surface 302S of the pouch 30 is recessed inward, the appearance of the pouch battery 1a may deteriorate. Furthermore, if the bottom surface 302S of the pouch 30 is recessed inward, the volumetric efficiency of the pouch battery 1a may deteriorate.

[0072] Figure 8 A perspective view showing the 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, such that the first fixing portion 50 supports the bottom of the bag 30. The first fixing portion 50 thus prevents the bottom surface 302 of the bag 30 from being concave inward. That is, the first fixing portion 50 prevents 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 respect.

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

[0075] refer to Figure 8 and Figure 9According to the embodiment, the second fixing portion 60 may cover at least a portion of the first fixing portion 50. The second fixing portion 60 covers 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 can 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] According to the embodiment, the second-first fixing portion 61 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 second-first fixing portion 61. However, the arrangement and number of the second-first fixing portions 61 are not limited to the foregoing description.

[0077] According to the embodiment, the second-2 fixing portion 62 can be arranged on the side surface 301 of the bag 30. The second-2 fixing portion 62 can support the second-1 fixing portion 61 on one side, such that the second-1 fixing portion 61 fixes the first fixing portion 50. The second-2 fixing portion 62 can be fixed to the side surface 301 of the bag 30 to fix the second-1 fixing portion 61. However, the arrangement and number of the second-2 fixing portions 62 are not limited to those described above.

[0078] The second fixing portion 60 extends in a direction intersecting the direction in which the first fixing portion 50 extends. More specifically, the first fixing portion 50 extends on the bottom surface 302 of the bag 30 in a direction parallel to a third direction x. The second-first fixing portion 61 extends on the bottom surface 302 of the bag 30 in a second direction y. As shown, the second direction y intersects the third direction x. The second-second fixing portion 62 extends along the side surface 301 of the bag 30 in a first direction z. As shown, the first direction z intersects the third direction x. Because the second fixing portion 60 extends in a direction intersecting the direction in which the first fixing portion 50 extends, the second fixing portion 60 can effectively fix the first fixing portion 50 to the bag 30.

[0079] The insulating portion 41 and the second fixing portion 60 can be arranged so that they do not overlap each other on one side of the bag 30. Furthermore, the insulating portion 41 and the second fixing portion 60 can be arranged so that they do not overlap each other on the side surface 301 of the bag 30 in a second direction y. The second direction y can be the thickness direction of the bag-type battery 1. If the insulating portion 41 and the second fixing portion 60 are arranged so that they do not overlap each other on the side surface 301 of the bag 30 in the second direction y, the thickness of the bag-type battery 1 does not need to be increased. If the insulating portion 41 and the second fixing portion 60 are arranged so that they do not overlap each other on the side surface 301 of the bag 30 in the second direction y, the bag-type battery 1 can have high volumetric efficiency.

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

[0081] According to the embodiment, the insulating portion 41 and the second fixing portion 60 can be spaced apart from each other by a predetermined distance on one side of the bag 30. The second-second fixing portion 62 can 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 bag 30. If the second-second fixing portion 62 is spaced apart from the insulating portion 41, this can mean that the second-second fixing portion 62 is spaced apart by a predetermined distance at the end of the second-first 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 second-first fixing portion 61 can be a direction toward the center of the bag-type battery 1 in the third direction x. The position of the second-second fixing portion 62 relative to the second-first fixing portion 61 can be toward the center of the bag-type battery 1 in the third direction x. Therefore, the second-second fixing portion 62 can 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 bag 30.

[0082] If a plurality of second fixing portions 60, such as two second fixing portions 60, exist according to embodiments of the present disclosure, the plurality of second fixing portions 60 may be arranged on opposite sides in the first direction z at the lower end of the bag 30. If a second-2 fixing portion 62 included in each of the plurality of second fixing portions 60 extends from a second-1 fixing portion 61, each second-2 fixing portion 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 second-2 fixing portions 62 and the second-1 fixing portions 61 is not limited to the foregoing description. For example, the second-2 fixing portions 62 may be arranged in various ways such that the second-2 fixing portions 62 do not overlap with the insulating portion 41 on the side surface 301 of the bag 30.

[0083] If the second-2 fixing portion 62 is too far apart on the side surface 301 of the bag 30, the function of the second-2 fixing portion 62 in fixing the second-1 fixing portion 61 may be reduced. Hereinafter, a ramp structure will be described that is configured such that the second-2 fixing portion 62 effectively fixes the second-1 fixing portion 61 without being too far apart on the side surface 301 of the bag 30.

[0084] Figure 10 This is a conceptual diagram illustrating a ramp structure 42T included in a protective strip 40 according to an embodiment of the present disclosure. Figure 11 This is a conceptual diagram for describing a ramp structure 62T included in the second fixed portion 60 according to other embodiments of the present disclosure. Figure 10 and Figure 11 Show Figure 9 An enlarged view of region A in the image.

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

[0086] The second fixing portion 60 according to an embodiment may include a ramp structure 62T to prevent overlap with the upper fixing portion 42 of the insulating portion 41. Specifically, the second-second fixing portion 62 may include a ramp structure 62T to prevent overlap with the upper fixing portion 42 of the insulating portion 41. Due to the ramp structure 62T, the second-second fixing portion 62 can effectively fix the second-first fixing portion 61 while being spaced apart from the insulating portion 41.

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

[0088] According to the present disclosure, the pouch-type battery can prevent deformation of the bottom surface of the bag by means of a first fixing portion disposed on the bottom surface of the bag. Furthermore, according to the present disclosure, the pouch-type battery can prevent deformation of the bottom surface of the bag by means of a second fixing portion covering at least a portion of the first fixing portion.

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

[0090] It should be understood that the embodiments described herein are to be considered in a descriptive sense only and are not intended to be limiting. The description of features or aspects in each embodiment should generally be considered 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 detail may be made therein without departing from the spirit and scope of this disclosure as defined by the claims.

Claims

1. A pouch-type battery, characterized by, Comprising: 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 a portion of the second electrode are exposed to an 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, wherein an end portion of the first fixing portion is disposed on a bottom surface of the pouch, and wherein the second fixing portion covers at least a portion of the first fixing portion.

2. The pouch cell of claim 1, wherein A plurality of the first fixing portions and a plurality of the second fixing portions are provided.

3. The pouch cell of claim 2, wherein The plurality of first fixing portions extend in opposite directions on the bottom surface of the pouch.

4. The pouch cell of 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 cell of claim 1, wherein The protective tape further includes an insulation portion covering the sealed portion on a side surface of the pouch, and wherein an end portion of the second fixing portion is disposed on the side surface on which the insulation portion is disposed.

6. The pouch cell of claim 5, wherein, The second fixing portion is disposed not to overlap the insulation portion on the side surface of the pouch.

7. The pouch cell of claim 6, wherein, The insulation portion includes a slope structure so that the insulation portion does not overlap the second fixing portion.

8. The pouch cell of claim 7, wherein, The second fixing portion includes a slope structure so that the second fixing portion does not overlap the insulation portion.

9. The pouch cell of claim 8, wherein, The insulation portion and the second fixing portion are spaced apart from each other on the side surface of the pouch.

10. The pouch cell of claim 6, wherein, The second fixing portion includes: a 2-1 fixing portion covering the first fixing portion on the bottom surface of the pouch; and a 2-2 fixing portion disposed on the side surface of the pouch.

11. The pouch cell of claim 10, wherein, The 2-2 fixing portion does not overlap the insulation portion of the pouch on the side surface.

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