Pouch for secondary battery comprising multiple pouches and secondary battery including the same

Abstract

The secondary battery according to the present invention may include an electrode assembly formed by alternately stacking electrodes and separators, a plurality of pouches surrounding the electrode assembly and sealing the electrode assembly, and a spring portion coupled to an outermost pouch of the plurality of pouches and determining a degree of structural rigidity of the outermost pouch.The secondary battery according to the present invention may include an electrode assembly formed by alternately stacking electrodes and separators, a plurality of pouches surrounding the electrode assembly and sealing the electrode assembly, an opening formed on one side of an outermost pouch of the plurality of pouches and formed to penetrate a portion of the one side, and spring portions coupled to both ends of the opening and determining a degree of structural rigidity of the outermost pouch.

Description

[Technical field]

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2021-0149043 filed on November 2, 2021, and all contents disclosed in the documents of that Korean patent application are incorporated herein by reference.

[0002] The present invention relates to a pouch for a secondary battery comprising a plurality of pouches and a secondary battery including the same. [Background technology]

[0003] As the need for alternative energy sources increases, research and development is being conducted on electricity production technologies based on energy sources that have less impact on environmental pollution, such as solar heat, hydroelectric power, wind power, marine energy, biomass energy, etc. In particular, research on secondary batteries that can be repeatedly charged is being actively conducted, and development is being conducted in terms of materials, efficiency, structure, stability, and systems for secondary batteries.

[0004] Various types of secondary batteries, such as pouch-type, square-type, cylindrical-type, etc., are applied to electronic systems such as automobiles, mobile phones, notebook computers, etc., and the electronic systems are packed / sealed by packing / sealing methods corresponding to the respective types. However, in terms of the structural rigidity and stability of the electronic systems to which the secondary batteries are applied, management of the packing and sealing of the secondary batteries is required, and structures for packing and sealing have been proposed.

[0005] In the case of pouch-type secondary batteries, various methods and structures for sealing multiple areas of the pouch have been proposed to manage the hermeticity of the secondary battery, and degassing methods and devices have been proposed to manage the internal pressure of the secondary battery.

[0006] According to the conventional technology, in the case of a pouch-type secondary battery, it is difficult to determine or adjust the degree of rigidity of the pouch, and therefore, it may be difficult to manage the structural rigidity when defects occur in the battery management system or during the packing process.

[0007] According to conventional technology, when the internal pressure of a secondary battery increases while the secondary battery is used in an electronic system, it may be difficult to maintain a degree of structural rigidity of the pouch in response to the increase in the internal pressure of the secondary battery. Summary of the Invention [Problem to be solved by the invention]

[0008] The problem to be solved by the present invention is to provide a pouch for a secondary battery that can realize various degrees of structural rigidity and that is easier to seal and manage internal pressure by applying a structure that is adaptive to changes in internal pressure, and a secondary battery including the pouch for a secondary battery. [Means for solving the problem]

[0009] The pouch for a secondary battery according to the present invention may include a plurality of pouches for accommodating an electrode assembly, and a spring portion coupled to an outermost pouch among the plurality of pouches and determining a degree of structural rigidity of the outermost pouch.

[0010] At least one hole may be formed in the outermost pouch, and the spring portion may be coupled to the at least one hole. Each of the plurality of pouches may include an outer resin layer, an inner resin layer, and a metal foil layer positioned between the outer resin layer and the inner resin layer.

[0011] At least one hole may be formed in each of the plurality of pouches. A hole formed in one of the plurality of pouches may not overlap with holes formed in other pouches surrounding the one pouch.

[0012] The spring portion may include a spring, and the degree of the structural rigidity of the spring portion may be determined based on an elastic force determined according to characteristics of the spring.

[0013] The spring characteristic is at least one of a spring material, a spring thickness, and a spring length, and the elastic force can be determined by changing at least one of the spring material, the spring thickness, and the spring length.

[0014] The secondary battery according to the present invention may include an electrode assembly formed by alternately stacking electrodes and separators, a plurality of pouches surrounding the electrode assembly and sealing the electrode assembly, and a spring portion coupled to an outermost pouch among the plurality of pouches and determining a degree of structural rigidity of the outermost pouch.

[0015] The pouch for a secondary battery according to the present invention may include a plurality of pouches for accommodating an electrode assembly; an opening formed on one side of an outermost pouch among the plurality of pouches and penetrating a portion of the one side; and a spring portion coupled to both ends of the opening and determining a degree of structural rigidity of the outermost pouch.

[0016] The opening may be formed along a periphery of the one side and may be formed to be ⅓ or less of a length of the one side. The spring portion may include a spring, and the degree of the structural rigidity of the spring portion may be determined based on an elastic force determined according to characteristics of the spring.

[0017] The spring characteristic is at least one of a spring material, a spring thickness, and a spring length, and the elastic force can be determined by changing at least one of the spring material, the spring thickness, and the spring length.

[0018] The secondary battery according to the present invention may include an electrode assembly formed by alternately stacking electrodes and separators; a plurality of pouches surrounding the electrode assembly and sealing the electrode assembly; an opening formed on one side of an outermost pouch among the plurality of pouches and penetrating a portion of the one side; and a spring portion coupled to both ends of the opening and determining a degree of structural rigidity of the outermost pouch. Effect of the Invention

[0019] According to the present invention, a structure in which a plurality of pouches surround an electrode assembly of a secondary battery is proposed, thereby improving the basic structural rigidity of the secondary battery. According to the present invention, the spring portion capable of determining the degree of structural rigidity is coupled to the outermost pouch among the plurality of pouches, thereby improving the flexibility of the degree of structural rigidity of the secondary battery.

[0020] According to the present invention, since a hole is formed in each of the plurality of pouches, it is easy to manage the internal pressure and the electrolyte in the secondary battery. According to the present invention, even if there is a defect in the secondary battery management system or the packing itself, the pouch itself can ensure stable structural rigidity. [Brief description of the drawings]

[0021] [Figure 1] 1 is a diagram showing a secondary battery according to an embodiment of the present invention; [Diagram 2] 1 is an enlarged view of a secondary battery according to one embodiment of the present invention, as viewed obliquely (eg, in the direction indicated by the arrow a). [Diagram 3] 1 is a plan view of a secondary battery according to one embodiment of the present invention, viewed from above (eg, in the direction b). [Figure 4] 1A and 1B are diagrams showing the structure of multiple pouches of a secondary battery according to one embodiment of the present invention; [Diagram 5] 1 is a side view of a secondary battery according to an embodiment, as viewed from a side direction (eg, direction c). [Figure 6]FIG. 13 is a diagram showing a secondary battery according to another embodiment of the present invention. [Figure 7] FIG. 13 is a diagram showing a secondary battery according to still another embodiment of the present invention. [Figure 8] FIG. 11 is a side view of a secondary battery according to still another embodiment of the present invention, as viewed from a side direction (eg, direction d). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the accompanying drawings, in order to enable those skilled in the art to easily carry out the present invention. However, the present invention may be realized in various different forms, and is not limited to the following embodiments.

[0023] In order to clearly explain the present invention, detailed descriptions of parts that are not relevant to the explanation or related prior art that may unnecessarily obscure the gist of the present invention will be omitted, and when assigning reference symbols to components in each drawing in this specification, the same or similar reference symbols will be assigned to the same or similar components throughout the specification.

[0024] Furthermore, the terms and words used in this specification and the claims should not be interpreted in a limited manner to their ordinary or dictionary meanings, but should be interpreted in a manner that is consistent with the technical ideas of the present invention, based on the principle that the inventors can appropriately define the concepts of terms in order to best describe their invention.

[0025] FIG. 1 shows a secondary battery according to one embodiment of the present invention. The secondary battery 100 may include an electrode assembly 120 formed by alternately stacking electrodes and separators therein.

[0026] The secondary battery 100 may include a pouch 110. For example, the pouch 110 may form the exterior of the secondary battery 100. As another example, the pouch 110 may be formed to include a plurality of pouches.

[0027] The pouch 110 may be formed to surround the electrode assembly 120 inside the secondary battery 100. For example, the pouch 110 may surround the electrode assembly 120 to seal the electrode assembly 120. As another example, the secondary battery 100 may be formed with a receiving portion capable of receiving the electrode assembly 120, and the pouch 110 may seal the receiving portion (or the electrode assembly 120 received in the receiving portion) in a form surrounding the receiving portion.

[0028] The pouch 110 may be made up of a plurality of pouches, and the plurality of pouches may be formed to surround the electrode assembly 120. The plurality of pouches may surround the electrode assembly 120 to seal the electrode assembly 120. The plurality of pouches may sequentially surround the electrode assembly 120 (or a receiving portion) to seal the electrode assembly 120.

[0029] The pouch 110 may include an outer resin layer, an inner resin layer, and a metal foil layer located between the outer and inner resin layers. When the pouch 110 is made up of a plurality of pouches, each of the plurality of pouches may include an outer resin layer, an inner resin layer, and a metal foil layer located between the outer and inner resin layers.

[0030] The pouch 110 may have one or more holes formed therein for discharging gas generated in the electrode assembly 120 or for adjusting the internal pressure. When pouch 110 is made up of multiple pouches, one or more holes may be formed in each of the multiple pouches.

[0031] A spring portion configured to adjust the degree of structural rigidity (or sealing force) of the pouch 110 may be coupled to one or more holes formed in the pouch 110 .

[0032] Fig. 2 shows an enlarged view of a secondary battery according to an embodiment of the present invention as viewed from an oblique direction (e.g., direction a). Fig. 2 is a perspective view of the secondary battery 100 as viewed from direction a (e.g., the oblique direction from the z-axis direction to the y-axis direction).

[0033] The secondary battery 100 may include an electrode assembly 120 therein, and the pouch 110 may be formed to surround the electrode assembly 120 . The secondary battery 100 may be formed with a receiving portion capable of receiving the electrode assembly 120, and the electrode assembly 120 may be received in the receiving portion.

[0034] The pouch 110 may be configured to surround the electrode assembly 120 and / or the housing. The pouch 110 may be composed of a plurality of pouches. For example, the pouch 110 may include a first pouch 210, a second pouch 220, and a third pouch 230. In a specific example, the first pouch 210 may be formed to surround the electrode assembly 120 (or the housing), the second pouch 220 may be formed to surround the first pouch 210, and the third pouch 230 may be formed to surround the second pouch 220.

[0035] When the pouch 110 is made up of a plurality of pouches, the outermost pouch may be referred to as the outermost pouch. For example, when the first pouch 210 is formed so as to surround the electrode assembly 120, the second pouch 220 is formed so as to surround the first pouch 210, and the third pouch 230 is formed so as to surround the second pouch 220, the third pouch 230 may be referred to as the outermost pouch. As another example, when the pouch 110 is made up of two pouches, the first pouch 210 is formed so as to surround the electrode assembly 120 (or the housing portion) and the second pouch 220 is formed so as to surround the first pouch 210, the second pouch 220 may be referred to as the outermost pouch.

[0036] One or more holes (for example, hole 310) may be formed in pouch 110. When pouch 110 is made up of multiple pouches, one or more holes may be formed in each of the multiple pouches.

[0037] In the above description, the number of pouches is described as three, but this is merely an example, and the number of pouches may be two, or four or more.

[0038] The description given assuming that pouch 110 consists of three pouches can be equally / similarly applied to the case where pouch 110 consists of two pouches and / or four or more pouches.

[0039] Fig. 3 is a plan view of a secondary battery according to an embodiment of the present invention as viewed from above (e.g., direction b). Fig. 3 shows the secondary battery 100 as viewed from direction b (e.g., direction as viewed from the z-axis direction).

[0040] A hole 310 may be formed on one side of the pouch 110 (or the third pouch 230 which is the outermost pouch), and a hole 320 may be formed on the other side of the pouch 110 (or the third pouch 230 which is the outermost pouch). The positions of the holes 310 and 320 shown in FIG. 3 are exemplary, and the holes may be formed in different positions depending on the design.

[0041] Referring to FIG. 3, the N-N' line may be a folding line, and although an unfolded view is shown for ease of explanation, the other side where hole 320 is formed may be folded based on the N-N' line relative to the one side where hole 310 is formed.

[0042] Hole 310 and hole 320 may be holes formed in third pouch 230, which is the outermost pouch of pouch 110, and holes may be formed in other pouches as well as the outermost pouch of pouch 110.

[0043] Fig. 4 shows a structure of a plurality of pouches of a secondary battery according to one embodiment of the present invention, Fig. 4 shows a layered structure of a pouch 110 consisting of a plurality of pouches. The pouch 110 may be formed to include a plurality of pouches. For example, the pouch 110 may be formed to surround the electrode assembly 120, and the electrode assembly 120 may be surrounded by a plurality of pouches. As another example, the secondary battery 100 may be formed with a receiving portion capable of receiving the electrode assembly 120, and the pouch 110 may be formed to surround the receiving portion.

[0044] When the pouch 110 consists of three pouches, the first pouch 210 may be formed to surround the electrode assembly 120 (or the receiving portion), the second pouch 220 may be formed to surround the first pouch 210, and the third pouch 230 may be formed to surround the second pouch 220.

[0045] When pouch 110 is made up of three pouches, the stacked cross-sectional structure may be, as shown in FIG. 4, a form in which second pouch 220 is stacked on first pouch 210, and third pouch 230 is stacked on second pouch 220.

[0046] When the pouch 110 is made up of three pouches, the outermost pouch may be the third pouch 230, and the third pouch 230 may have one or more holes 310 formed therein.

[0047] The first pouch 210 may have one or more holes 312 formed therein, and the second pouch 220 may have one or more holes 311 formed therein. The hole 311 of the second pouch 220 may be formed so as not to overlap with the hole 312 of the first pouch 210 and / or the hole 310 of the third pouch 230. For example, the hole 311 of the second pouch 220 may be disposed so as to be offset from the holes 312 and 310, thereby preventing the electrolyte inside the pouch 110 from easily leaking.

[0048] When the pressure inside pouch 110 of secondary battery 100 becomes high, one or more holes (e.g., hole 312, hole 311, hole 310) are formed in each of the multiple pouches (e.g., first pouch 210, second pouch 220, third pouch 230), and the internal pressure can be reduced by discharging gas to the outside of pouch 110 through the above-mentioned holes.

[0049] The arrangement of holes (eg, holes 310, 311, and 312) shown in FIG. 4 is exemplary and may be arranged differently from the illustrated arrangement depending on the design.

[0050] Fig. 5 shows a side view of a secondary battery according to one embodiment as viewed from a side direction (e.g., direction c). Fig. 5 shows a state of the secondary battery 100 as viewed from direction c (e.g., direction as viewed from the y-axis direction).

[0051] One or more holes may be formed on the other side of the pouch 110. For example, a hole 320 and a hole 330 may be formed. When pouch 110 consists of three pouches, one or more holes (eg, hole 320, hole 330) may be formed on third pouch 230, which is the outermost pouch.

[0052] The spring portion 410 may be coupled to one or more holes (e.g., hole 320, hole 330) formed in the pouch 110 (or the third pouch 230, which is the outermost pouch). For example, one end of the spring portion 410 may be coupled to the hole 320, and the other end of the spring portion 410 may be coupled to the hole 330.

[0053] The spring portion 410 may include at least a spring. One end of the spring may be coupled to the hole 320, and the other end of the spring may be coupled to the hole 330. For example, the spring portion 410 may be coupled and fixed to a hole (e.g., hole 320, hole 330). As another example, both ends of the spring of the spring portion 410 may be coupled (e.g., hook coupled) to the hole (e.g., hole 320, hole 330) in a hook-like manner.

[0054] The elastic force of the spring included in the spring unit 410 may be determined according to the characteristics of the spring (e.g., the material, thickness, length, etc. of the spring). For example, the higher the elastic coefficient, which is determined according to the material, thickness, length, etc. of the spring, the higher the elastic force may be.

[0055] The spring portion 410 is coupled to a hole (e.g., hole 320, hole 330) and can determine the degree of structural rigidity of the pouch 110. For example, if the spring portion 410 includes a spring with a high elastic modulus, it can ensure a higher elastic force than if it includes a spring with a low elastic modulus. The higher the elastic force of the spring portion 410, the higher the degree of structural rigidity of the pouch 110 can be determined.

[0056] FIG. 6 shows a secondary battery according to another embodiment of the present invention. The pouch 110 of the secondary battery 100 according to another embodiment may not have a folded portion.

[0057] The secondary battery 100 may include a pouch 110. For example, the secondary battery 100 may include a pouch 110 including a plurality of pouches, and the pouch 110 may surround an electrode assembly (e.g., the electrode assembly 120) therein. In another example, the secondary battery 100 may be formed with a receiving portion capable of receiving the electrode assembly 120, and the pouch 110 may surround the receiving portion. In addition, each of the plurality of pouches may include an outer resin layer, an inner resin layer, and a metal foil layer located between the outer resin layer and the inner resin layer.

[0058] If pouch 110 consists of three pouches, the outermost pouch may be third pouch 230. One or more holes may be formed in pouch 110 (or the outermost pouch), for example, holes 340 and 350 may be formed on one side of the pouch.

[0059] The one or more holes formed in the pouch 110 are not limited to the one side of the pouch as described above, but may be formed on the other side. For example, if the pouch 110 has multiple sides, the one or more holes may be formed on the remaining sides as well, but are not limited to the one side as described above.

[0060] The spring portion 420 may be coupled to one or more holes (holes 340, 350) formed on one side of the pouch 110. For example, one end of the spring portion 420 may be coupled to the hole 340, and the other end of the spring portion 420 may be coupled to the hole 350. In another example, the spring portion 420 may include a spring, and one end of the spring may be coupled to the hole 340, and the other end of the spring may be coupled to the hole 350. The spring portion 420 or a spring included in the spring portion 420 may be coupled (e.g., hook coupled) to a hole (e.g., hole 340, hole 350) in a hook-like manner.

[0061] The elastic force of the spring included in the spring unit 420 may be determined according to the characteristics of the spring (e.g., the material, thickness, length, etc. of the spring). For example, the higher the elastic coefficient, which is determined according to the material, thickness, length, etc. of the spring, the higher the elastic force may be.

[0062] The spring portion 420 is coupled to a hole (e.g., hole 340, hole 350) and can determine the degree of structural rigidity of the pouch 110. For example, if the spring portion 420 includes a spring with a high elastic modulus, a higher elastic force can be secured than if the spring portion 420 includes a spring with a low elastic modulus. The higher the elastic force of the spring portion 420, the higher the degree of structural rigidity of the pouch 110 can be determined.

[0063] FIG. 7 shows a secondary battery according to still another embodiment of the present invention. An electrode assembly (e.g., electrode assembly 120) may be accommodated inside the secondary battery 100. For example, a receiving portion capable of accommodating the electrode assembly 120 may be formed inside the secondary battery 100, and the electrode assembly 120 may be accommodated in the receiving portion.

[0064] The secondary battery 100 may include a pouch 110. For example, the pouch 110 may surround an electrode assembly (e.g., the electrode assembly 120) or a housing inside the secondary battery 100.

[0065] The pouch 110 may be composed of a plurality of pouches. For example, the plurality of pouches may surround an electrode assembly (e.g., the electrode assembly 120) or a housing inside the secondary battery 100. As another example, each of the plurality of pouches may include an outer resin layer, an inner resin layer, and a metal foil layer located between the outer resin layer and the inner resin layer.

[0066] The pouch 110 (or a plurality of pouches) may seal the electrode assembly (e.g., the electrode assembly 120) or the housing. For example, the pouch 110 (or a plurality of pouches) may surround the electrode assembly (e.g., the electrode assembly 120) or the housing, thereby sealing the electrode assembly (e.g., the electrode assembly 120) or the housing.

[0067] When the pouch 110 is made up of a plurality of pouches, an opening may be formed in the outermost pouch among the plurality of pouches. For example, when the pouch 110 is made up of three pouches, an opening 360 may be formed on one side of the outermost pouch (e.g., the third pouch 230). In another example, the opening 360 may be formed along the length direction of the outermost pouch (e.g., the third pouch 230). The opening 360 may be formed to penetrate a portion of one side of the outermost pouch (e.g., the third pouch 230).

[0068] The spring portion 430 may be coupled to both ends of the opening 360. For example, the spring portion 430 may be coupled to both ends of the opening 360 to determine a degree of structural rigidity of the outermost pouch (e.g., the third pouch 230).

[0069] Fig. 8 shows a side view of a secondary battery according to still another embodiment of the present invention as seen from a side direction (e.g., d direction). Fig. 8 shows a side view of a pouch 110 of a secondary battery 100 as seen from d direction (e.g., from -y axis direction to +y axis direction).

[0070] An opening may be formed on one side of the outermost pouch (e.g., the third pouch 230) of the pouch 110. For example, the opening 360 may be formed along the length direction (e.g., the z-axis direction) of one side of the outermost pouch (e.g., the third pouch 230).

[0071] The opening 360 may be formed to be ⅓ or less of the length of one side of the outermost pouch (e.g., the third pouch 230). For example, when the length of one side of the outermost pouch (e.g., the third pouch 230) is H, the length h of the opening 360 may be formed to be ⅓H or less.

[0072] The spring portion 430 may be coupled to both ends of the open portion 360. For example, one end of the spring portion 430 may be coupled to one end of the open portion 360, and the other end of the spring portion 430 may be coupled to the other end of the open portion 360.

[0073] The spring portion 340 may include a spring. One end of the spring of the spring portion 430 may be coupled to one end of the open portion 360 , and the other end of the spring of the spring portion 430 may be coupled to the other end of the open portion 360 .

[0074] The degree of structural rigidity of pouch 110 (or outermost pouch 230) may be determined based on the elastic force determined according to the characteristics of spring portion 430 or the spring included in spring portion 430. For example, the elastic force of the spring included in spring portion 420 may be determined according to the spring characteristics (e.g., the material of the spring, the thickness of the spring, the length of the spring, etc.). For example, the higher the elastic coefficient determined by the material of the spring, the thickness of the spring, the length of the spring, etc., the higher the elastic force may be.

[0075] The spring portion 430 is coupled to the opening portion 360 and can determine the degree of structural rigidity of the pouch 110. For example, if the spring portion 430 includes a spring with a high elastic modulus, a higher elastic force can be secured than if the spring portion 430 includes a spring with a low elastic modulus. The higher the elastic force of the spring portion 430 or the spring, the higher the degree of structural rigidity of the pouch 110 can be determined.

[0076] Although the present invention has been described above using limited embodiments and drawings, the present invention is not limited thereto, and various implementations are possible within the scope of the technical concept of the present invention and the scope of the claims described below by a person having ordinary knowledge in the technical field to which the present invention belongs. [Explanation of symbols]

[0077] 100: Secondary battery 110: Multiple pouches 120: Electrode assembly 210: 1st pouch 220: 2nd pouch 230: 3rd pouch 310: Outermost hole 311: Hall 312: Hall 320: Outermost hole 330: Outermost hole 340: Outermost hole 350: Outermost hole 360:Open part 410: Spring section 420: Spring section 430: Spring section

Claims

1. a plurality of pouches containing the electrode assemblies; a spring portion coupled to an outermost pouch of the plurality of pouches and determining a degree of structural rigidity of the outermost pouch; A pouch for a secondary battery comprising:

2. The outermost pouch has at least one hole formed therein; The pouch for a secondary battery according to claim 1 , wherein the spring portion is coupled to the at least one hole.

3. 3. The pouch for a secondary battery according to claim 1, wherein each of the plurality of pouches includes an outer resin layer, an inner resin layer, and a metal foil layer located between the outer resin layer and the inner resin layer.

4. The pouch for a secondary battery according to claim 1 or 2, wherein at least one hole is formed in each of the plurality of pouches.

5. The pouch for a secondary battery according to claim 4 , wherein a hole formed in one of the plurality of pouches does not overlap with holes formed in other pouches surrounding the one pouch.

6. The spring portion includes a spring. The pouch for a secondary battery according to claim 1 , wherein the degree of the structural rigidity of the spring portion is determined based on an elastic force determined according to a characteristic of the spring.

7. The spring characteristic is at least one of a spring material, a spring thickness, and a spring length; 7. The pouch for a secondary battery according to claim 6, wherein the elastic force is determined by changing at least one of a material of the spring, a thickness of the spring, and a length of the spring.

8. an electrode assembly formed by alternately stacking electrodes and separators; a plurality of pouches surrounding the electrode assembly and sealing the electrode assembly; a spring portion coupled to an outermost pouch of the plurality of pouches and determining a degree of structural rigidity of the outermost pouch; A secondary battery comprising:

9. a plurality of pouches containing the electrode assemblies; an opening formed on one side of an outermost pouch among the plurality of pouches and formed to penetrate a portion of the one side; a spring portion coupled to both ends of the opening portion and determining a degree of structural rigidity of the outermost pouch; A pouch for a secondary battery comprising:

10. The opening is The groove is formed along the periphery of the one side. The pouch for a secondary battery according to claim 9 , wherein the width of the one side is equal to or less than one third of the length of the one side.

11. The spring portion includes a spring.

11. The pouch for a secondary battery according to claim 9, wherein a degree of the structural rigidity of the spring portion is determined based on an elastic force determined according to a characteristic of the spring.

12. The spring characteristic is at least one of a spring material, a spring thickness, and a spring length; The pouch for a secondary battery according to claim 11 , wherein the elastic force is determined by changing at least one of a material of the spring, a thickness of the spring, and a length of the spring.

13. an electrode assembly formed by alternately stacking electrodes and separators; a plurality of pouches surrounding the electrode assembly and sealing the electrode assembly; an opening formed on one side of an outermost pouch among the plurality of pouches and formed to penetrate a portion of the one side; a spring portion coupled to both ends of the opening portion and determining a degree of structural rigidity of the outermost pouch; A secondary battery comprising:

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