Pouch-shaped housing, secondary battery using the same, and secondary battery pack

Abstract

The present invention provides a pouch-shaped case comprising: a first accommodating portion and a second accommodating portion, the first accommodating portion and the second accommodating portion being formed to accommodate an electrode assembly; a sealing portion formed along the exterior of the pouch-shaped case so as to surround the first accommodating portion and the second accommodating portion; and a connecting portion formed to have the same depth as the first accommodating portion and the second accommodating portion and configured to connect the first accommodating portion and the second accommodating portion at a predetermined interval, wherein protrusions extend toward the sealing portion at opposite ends of the connecting portion. Therefore, in the pouch-shaped case and a secondary battery and a secondary battery pack using the same, a perfect cooling structure is achieved by uniformly forming one side surface of the secondary battery, thereby achieving an effect of bringing one side surface of the secondary battery close to a cooling plate to maximize cooling efficiency.

Description

[0001] This application is a divisional application of Chinese Patent Application No. 201910257927.6, filed on April 1, 2019, and entitled “Pouch-Shaped Casing, Secondary Battery Using the Same, and Secondary Battery Pack.” This application claims priority to Korean Patent Application No. 10-2018-0037661, filed on March 30, 2018. Technical Field

[0002] The present invention relates to a pouch-shaped shell, a secondary battery and a secondary battery pack using the same, and more particularly, to a pouch-shaped shell that is configured to form a perfect cooling structure on one side surface of the secondary battery when the pouch-shaped shell is used, and to bring one side surface of the secondary battery close to a cooling plate to maximize cooling efficiency and possess high energy density; and also to a secondary battery and a secondary battery pack using the pouch-shaped shell. Background Art

[0003] Generally, lithium secondary batteries are classified into can-type secondary batteries in which an electrode assembly is mounted in a metal can, and pouch-type secondary batteries in which an electrode assembly is mounted in a pouch of an aluminum laminate according to the shape of a case.

[0004] Lithium secondary batteries are widely used in medium and large-sized devices such as vehicles or power storage devices, as well as small mobile devices. In this case, in order to increase the capacity and output, multiple pouch-type secondary batteries are connected and used, which are easy to stack and lightweight.

[0005] However, when stacking multiple pouch-type secondary batteries to form a battery module, the heat generated by the multiple secondary batteries combines to rapidly increase the temperature of the battery module. Therefore, when using multiple pouch-type secondary batteries to form a battery module, it is very important to ensure stable and effective cooling performance.

[0006] Therefore, as a cooling method having a simple structure while ensuring effective cooling performance, a method of cooling the side surface portion of the pouch-type secondary battery through direct surface contact with the cooling plate has been studied, but to date, due to the limitations of the shape of the pouch-shaped shell, it is difficult to effectively bring the side surface portion of the pouch-type secondary battery close to the cooling plate.

[0007] Figure 1 is an exploded perspective view of a pouch-type secondary battery according to conventional technology.

[0008] See also Figure 1According to the conventional technology, the pouch-shaped shell 10 is constructed to provide a accommodating space therein for accommodating the electrode assembly 20, and the pouch-shaped shell 10 includes a pair of accommodating portions formed in the form of independent spaces, and the width and length of each of the pair of accommodating portions respectively correspond to the width and length of the accommodated electrode assembly 20, and the sum of the depths of the pair of accommodating portions roughly corresponds to the thickness of the electrode assembly 20.

[0009] However, conventional pouch-type secondary batteries, in addition to the three side surfaces of the sealed pouch-shaped housing 10, also have a side surface portion having a concave line formed along the length of the side surface. Consequently, due to the concave line formed on the side surface portion of the secondary battery, there is a problem of difficulty in effectively bringing the side surface portion of the secondary battery into contact with the cooling plate, and cooling efficiency is reduced.

[0010] To overcome the above problems, Patent Document 1 discloses a pair of accommodating portions formed as a single space within a pouch-shaped case, rather than as separate, independent spaces. However, even with such a pouch-shaped case, it is difficult to fold the case when encapsulating the electrode assembly, and it is difficult to uniformly form the side surface portions of the secondary battery that come into contact with the cooling plate.

[0011] [References cited]

[0012] [Patent Document]

[0013] Patent Document 1: Korean Patent Publication No. 10-2007-0102768 Summary of the Invention

[0014] An embodiment of the present invention relates to providing a pouch-shaped case, a secondary battery using the same, and a secondary battery pack, wherein the pouch-shaped case is configured to form a cooling structure on one side surface of the secondary battery when the pouch-shaped case is used, and to bring one side surface of the secondary battery close to a cooling plate to maximize cooling efficiency and have high energy density.

[0015] Another embodiment of the present invention is to provide a pouch-shaped shell, a secondary battery and a secondary battery pack using the same, wherein the pouch-shaped shell is constructed so that the side surface portion of the secondary battery formed is flat rather than protruding, and therefore, for the same battery capacitance, it occupies a relatively small space and has a high energy density.

[0016] The present invention is not limited to the above-mentioned objects, and other objects of the present invention will be partially set forth in the following description, and for ordinary technicians in this field, after reading the following content, the objects of the present invention will become obvious to a certain extent, or can be learned from the practice of the present invention.

[0017] In one general aspect, a pouch-shaped case is provided for accommodating and encapsulating an electrode assembly, the electrode assembly comprising a plurality of stacked electrodes and a diaphragm interposed therebetween, the pouch-shaped case comprising: a first accommodating portion and a second accommodating portion formed for accommodating the electrode assembly; a sealing portion formed along the exterior of the pouch-shaped case to surround the first accommodating portion and the second accommodating portion; a connecting portion formed to have the same depth as the first accommodating portion and the second accommodating portion and configured to connect the first accommodating portion and the second accommodating portion at a predetermined interval, wherein protrusions extend at opposite ends of the connecting portion in a direction toward the sealing portion.

[0018] In the pouch case according to the present invention, the protrusion may include a top formed at a predetermined height on a bottom surface of the connection portion; and an inclined portion formed to be inclined toward the bottom surface of the connection portion at one end of the top.

[0019] In the pouch case according to the present invention, the inclined portion may be connected to the top portion and the bottom surface of the connecting portion at a predetermined curvature radius.

[0020] In the bag-shaped case according to the present invention, the top portion may be formed to have the same height as the sealing portion.

[0021] In the bag-shaped shell according to the present invention, one side of the first accommodating portion and the connecting portion can be connected to each other along a first bent line, and the other side of the second accommodating portion and the connecting portion can be connected to each other along a second bent line, and the bag-shaped shell can be bent along the first fold line and the second fold line to accommodate the electrode assembly.

[0022] In the pouch case according to the present invention, the first fold line and the second fold line may be spaced apart from each other by a distance corresponding to a thickness of the electrode assembly.

[0023] In another general aspect, a secondary battery includes: a pouch-shaped case as described above; an electrode assembly comprising a plurality of stacked electrodes and a separator interposed therebetween, wherein the pouch-shaped case accommodates and encapsulates the electrode assembly in an accommodating space formed by folding a sealing portion to allow a first accommodating portion and a second accommodating portion to face each other.

[0024] In the secondary battery according to the present invention, the connecting portion may be configured to uniformly form the side surface of the encapsulated secondary battery, and the sealing portion may include an extension portion extending a predetermined length in a direction perpendicular to the side surface of the secondary battery at a portion adjacent to both end portions of the side surface of the secondary battery.

[0025] In another general aspect, a secondary battery pack includes: one or more secondary batteries as described above; a cooling plate including a first side surface, a second side surface facing the first side surface, and an upper surface that is in surface contact with side surface portions of the one or more secondary batteries.

[0026] In the secondary battery pack according to the present invention, the connecting portion may be configured to uniformly form the side surface of the encapsulated secondary battery, and the sealing portion may include an extension portion extending a predetermined length in a direction perpendicular to the side surface of the secondary battery at portions adjacent to both end portions of the side surface of the secondary battery.

[0027] In the secondary battery pack according to the present invention, a width between the first side surface and the second side surface of the cooling plate may correspond to a length of a connection portion of the secondary battery.

[0028] In the secondary battery pack according to the present invention, a width between the first and second side surfaces of the cooling plate may be greater than a length of a connection portion of the secondary battery.

[0029] In the secondary battery pack according to the present invention, a step difference having a height equal to or greater than a predetermined length of the extended portion of the secondary battery may be formed on each of the first and second side surfaces of the cooling plate.

[0030] In the secondary battery pack according to the present invention, one or more grooves may be formed on each of the first and second side surfaces of the cooling plate to accommodate the extension portion of the secondary battery, the depth of the groove being equal to or greater than a predetermined length of the extension portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is an exploded perspective view of a secondary battery according to conventional technology.

[0032] Figure 2 is an exploded perspective view of a secondary battery according to the present invention.

[0033] Figure 3 FIG. 4 is a plan view of a bag-shaped housing according to the present invention.

[0034] Figure 4 For the Figure 3 A cross-sectional view taken along line AA'.

[0035] Figure 5 For the Figure 3 Cross-sectional view taken along line BB'.

[0036] Figure 6 is a perspective view of a secondary battery according to the present invention.

[0037] Figure 7 A diagram showing a first embodiment in which secondary batteries and a cooling plate are coupled to constitute a secondary battery pack according to the present invention.

[0038] Figure 8 A and 8B are Figure 7 Detailed enlarged view of .

[0039] Figure 9 It is a diagram showing a second embodiment in which secondary batteries and a cooling plate are coupled to constitute a secondary battery pack according to the present invention.

[0040] Figure 10 A and 10B are Figure 9 Detailed enlarged view of .

[0041] Figure 11 A diagram showing a third embodiment in which secondary batteries and a cooling plate are coupled to constitute a secondary battery pack according to the present invention.

[0042] Figure 12 A and 12B are Figure 11 Detailed enlarged view of . DETAILED DESCRIPTION

[0043] Hereinafter, exemplary embodiments will be described in detail with reference to the accompanying drawings. The following detailed description is merely exemplary and is intended to explain exemplary embodiments of the present invention.

[0044] Figure 2 FIG. 1 is an exploded perspective view of a secondary battery 300 according to the present invention.

[0045] See also Figure 2 The secondary battery 300 of the present invention may include a pouch-shaped case 100 and an electrode assembly 200, wherein the electrode assembly 200 includes a plurality of stacked electrodes and a separator interposed therebetween. The pouch-shaped case 100 may contain and surround the electrode assembly 200, and may be sealed by sealing portions 150 that contact each other.

[0046] The first electrode tab 220 and the second electrode tab 230 may be formed at both ends of the electrode assembly 200. Figure 2 The case where the tabs are formed on two opposite side surfaces of the electrode assembly 200 is shown, but the configuration of the tabs of the secondary battery 300 of the present invention is not limited thereto, and the first tab 220 and the second tab 230 may be simultaneously provided on either side surface of the sealing portion 150 .

[0047] See also Figure 2The pouch-shaped shell 100 of the present invention may include a first accommodating portion 110 and a second accommodating portion 120 formed for accommodating the electrode assembly 200, a sealing portion 150 formed along the outside of the pouch-shaped shell 100 to surround the first accommodating portion 110 and the second accommodating portion 120, and a connecting portion 140 formed to have the same depth as the first accommodating portion 110 and the second accommodating portion 120 and configured to connect the first accommodating portion 110 and the second accommodating portion 120 at a predetermined interval "d", and protrusions 130 extending in a direction toward the sealing portion 150 at opposite ends of the connecting portion 140.

[0048] A pair of first and second accommodating portions 110, 120 for accommodating the electrode assembly 200 may be formed in the pouch-shaped case 100. The first and second accommodating portions 110, 120 may be formed in a concave shape within the pouch-shaped case 100 using a method such as pressing the inner portion of the pouch-shaped case 100. Here, each of the first and second accommodating portions 110, 120 may have a size corresponding to the width and length of the electrode assembly 200, and the sum of the lengths of the first and second accommodating portions 110, 120 may be formed to correspond to the thickness "t" of the electrode assembly 200.

[0049] The connecting portion 140 may be a member formed to have the same depth as the first and second accommodating portions 110 and 120, connecting the first and second accommodating portions 110 and 120 so as to be separated from each other by a predetermined interval "d", and the connecting portion 140 may connect the first and second accommodating portions 110 and 120 so as to appear as an extension of the bottom surfaces of the first and second accommodating portions 110 and 120. Here, the first accommodating portion may be connected to one side of the connecting portion 140 along a first fold line, and the second accommodating portion may be connected to the other side of the connecting portion 140 along a second fold line. When the pouch-shaped case 100 of the present invention is used to construct the secondary battery 300, the pouch-shaped case 100 may be bent along the first and second fold lines 101 and 102 and may accommodate the electrode assembly 200.

[0050] Therefore, after the secondary battery 300 is assembled, the connection portion 140 may constitute the side surface portion 310 of the secondary battery 300. Therefore, the width of the connection portion 140 may be determined so that the first fold line 101 and the second fold line 102 are separated from each other by a predetermined interval "d," which is approximately the same as the distance corresponding to the thickness "t" of the electrode assembly 200. The width of the connection portion 140 may be the same as the predetermined interval "d" separating the first fold line 101 and the second fold line 102. As described above, the predetermined interval "d" may be set to be substantially the same as the thickness "t" of the electrode assembly 200. However, the width of the connection portion 140 is not limited thereto and may be smaller or larger than the thickness of the electrode assembly 200 as needed.

[0051] Protrusions 130 protruding in a direction toward the sealing portion 150 may be formed at opposite ends of the connection portion 140 .

[0052] When the sealing portion 150 is folded to allow the first accommodating portion 110 and the second accommodating portion 120 to face each other to form an accommodating space for accommodating the electrode assembly 200 by the pouch-shaped case 100, the protrusion 130 can be a component for easily folding the sealing portion 150 without deforming the opposite ends of the side surface portion 310 of the secondary battery 300, and it can include a top 131 formed with a predetermined height on the bottom surface of the connecting portion 140, and an inclined portion 132 formed to incline at one end of the top 131 toward the bottom surface of the connecting portion 140.

[0053] Will refer to Figure 3-5 The detailed shape of the protrusion 130 is understood.

[0054] Figure 3 FIG. 1 is a plan view of a bag-shaped housing 100 according to the present invention. Figure 4 For the Figure 3 A cross-sectional view taken along line AA'. Figure 5 For the Figure 3 Cross-sectional view taken along line BB'.

[0055] See also Figure 4 The protrusion 130 may include a top portion 131 extending at the same height as the sealing portion 150 and an inclined portion 132 formed to be inclined toward the bottom surface of the connecting portion 140 at one end of the top portion 131. Figure 4As shown, when the inclined portion 132 is connected to the top portion 131 and the bottom surface of the connecting portion 140, the inclined portion 132 can be gradually connected to the top portion 131 and the bottom surface of the connecting portion 140 with a predetermined curvature radius. Similarly, the protrusion 130 can be formed to be gradually connected to the sealing portion 150 and the connecting portion 140 without a discontinuous inclination. Therefore, when the pouch case 100 is folded, the following effect can be achieved: the protrusion 130 located on the side surface portion 310 of the secondary battery 300 is prevented from being damaged or torn.

[0056] See also Figure 5 , the protrusion 130 can be formed on the connecting portion 140, which connects the first accommodating portion 110 and the second accommodating portion 120 to separate them from each other, and the width of the protrusion 130 can be formed to be smaller than the predetermined interval "d" separating the first accommodating portion 110 and the second accommodating portion 120 from each other.

[0057] So far, although an example has been described in which the top 131 of the protrusion 130 extends to the same height as the sealing portion 150 and the width of the protrusion 130 is formed to be less than the predetermined interval "d", the height of the top 131 and the width of the protrusion 130 are not limited thereto, and the height, width, etc. of the protrusion 130 can be adjusted according to the thickness "t" and the shape of the electrode assembly 200 or the material of the pouch-like shell 100.

[0058] Figure 6 is a perspective view of a secondary battery 300 according to the present invention.

[0059] The secondary battery 300 using the pouch-shaped shell 100 of the present invention may include the pouch-shaped shell 100 of the present invention and the electrode assembly 200, and after the electrode assembly 200 is accommodated in the accommodation space formed by folding the sealing part 150 to allow the first accommodation part 110 and the second accommodation part 120 to face each other, the pouch-shaped shell 100 can be sealed along the sealing part 150.

[0060] See also Figure 6 The connecting portion 140 of the pouch-shaped shell 100 may be configured to uniformly form the side surface portion 310 of the secondary battery 300 , and a recess 320 recessed toward the interior of the secondary battery 300 may be formed at opposite ends of the side surface portion 310 of the secondary battery 300 at positions corresponding to the protrusions 130 .

[0061] When the pouch-like shell 100 is folded, the recess 320 can guide the sealing portions 150 at the opposite ends of the side surface portion 310 to make it easy to fold, and can have various sizes and shapes according to the height, weight, etc. of the protrusion 130. The protrusion 130 can be appropriately adjusted according to the thickness "t" and shape of the electrode assembly 200 or the material of the pouch-like shell 100.

[0062] like Figure 6 As shown, the secondary battery 300 using the pouch case 100 of the present invention may be configured in such a manner that the side surface portion 310 is not concavely recessed or does not protrude but is formed in a flat and uniform shape.

[0063] Therefore, when the side surface portion 310 contacts the cooling plate 500 to cool the secondary battery 300 , since the side surface portion 310 is sufficiently close to the cooling plate 500 , the secondary battery 300 of the present invention may have high heat dissipation efficiency due to low heat resistance.

[0064] The secondary battery 300 using the pouch-shaped shell 100 of the present invention can be constructed in such a manner that the side surface portion 310 is not completely recessed or the side surface portion 310 does not protrude, but is formed in a flat shape. Therefore, when the side surface portion 310 contacts the cooling plate 500 to cool the secondary battery 300, since the side surface portion 310 is sufficiently close to the cooling plate 500, the secondary battery 300 of the present invention can have high heat dissipation efficiency due to low thermal resistance.

[0065] In addition, the secondary battery 300 of the present invention can be constructed in such a manner that the side surface portion 310 is uniformly formed without protruding, and therefore, for the same battery capacitance, the side surface portion 310 can occupy a smaller space compared to a case where the side surface portion 310 is folded or protruded outward due to a separate sealing member, and therefore, the secondary battery 300 of the present invention can advantageously have a high energy density.

[0066] The sealing portion 150 located at the portions adjacent to the opposite ends of the side surface portion 310 of the secondary battery 300 may include an extension portion 151 that extends a predetermined length in a direction perpendicular to the side surface portion 310 of the secondary battery 300 during the process of folding the sealing portion 150 for packaging. Thus, a space having a length equal to the length of the extension portion 151 may be formed between the extension portion 151 and the side surface portion 310. Here, the length of the extension portion 151 may be several millimeters.

[0067] When the secondary battery 300 and the cooling plate 500 of the present invention are connected to manufacture a secondary battery pack, the extension portion 151 formed as described above can perform the function of maintaining or fixing the arrangement of the secondary battery 300 relative to the cooling plate 500 by forming a groove 520 or a step difference 510 on the side surface of the cooling plate 500 for accommodating the extension portion 151.

[0068] Figure 7-12The drawings are diagrams showing first to third embodiments in which a secondary battery 300 and a cooling plate 500 are coupled to manufacture a secondary battery pack of the present invention.

[0069] Figure 7 、 8 8A and 8B are diagrams showing a first embodiment of a secondary battery pack according to the present invention, and detailed enlarged views thereof.

[0070] See also Figure 7 A plurality of secondary batteries 300 of the present invention may be arranged on a cooling plate 500 to form a secondary battery pack. The cooling plate 500 may include a first side surface, a second side surface facing the first side surface, and one or more upper surfaces in contact with the side surface portions 310 of the secondary batteries 300.

[0071] exist Figure 7 In the first embodiment of the secondary battery pack shown in , the width between the first and second side surfaces of the cooling plate 500 may correspond to the length of the connection portion 140 of the secondary battery 300. Figure 8 A and 8B, in this case, when the upper surface of the cooling plate 500 is brought close to the side surface portion 310 of the secondary battery 300 , the cooling plate 500 may be configured to be inserted between the extension portions 151 of the secondary battery 300 .

[0072] Due to this structure, the movement of the secondary battery 300 in the length direction of the secondary battery 300 is restricted, so the position of the secondary battery 300 can be prevented from being separated from the cooling plate 500, and the arrangement between the secondary battery 300 and the cooling plate 500 can be maintained.

[0073] Figure 9 and 10 They are a diagram showing a second embodiment of a secondary battery pack according to the present invention and an enlarged view of its details, respectively.

[0074] according to Figure 9 In the second embodiment of the secondary battery pack shown in , the width between the first and second side surfaces of the cooling plate 500 may be formed to be greater than the length of the connecting portion 140 of the secondary battery 300, and the height of the step difference 510 formed on each of the first and second side surfaces of the cooling plate 500 is equal to or greater than the predetermined length by which the extending portion 151 of the secondary battery 300 protrudes. Figure 10 A and 10B, the extension portion 151 of the secondary battery 300 may be formed to be placed on a step formed on the cooling plate 500 when the upper surface of the cooling plate 500 is brought close to the side surface portion 310 of the secondary battery 300 .

[0075] Due to this structure, the movement of the secondary battery 300 in the longitudinal direction of the secondary battery 300 is restricted, thereby preventing the position of the secondary battery 300 from being separated from the cooling plate 500, and achieving the effect of maintaining the arrangement between the secondary battery 300 and the cooling plate 500. In addition, in the secondary battery pack according to the second embodiment, the width of the cooling plate 500 can be further extended compared to the width of the cooling plate 500 according to the first embodiment, thereby achieving the effect of further improving the cooling efficiency.

[0076] Figure 11 and 12 A diagram showing a third embodiment of a secondary battery pack according to the present invention and an enlarged view of its details are respectively shown.

[0077] according to Figure 11 In the third embodiment of the secondary battery pack shown in , the width between the first and second side surfaces of the cooling plate 500 may be formed to be greater than the length of the connecting portion 140 of the secondary battery 300, and one or more grooves 520 having a depth equal to or greater than the predetermined length of the extension portion 151 may be formed on each of the first and second side surfaces of the cooling plate 500 to accommodate the extension portion 151 of the secondary battery 300. Figure 12 A and 12B, the extension portion 151 of the secondary battery 300 may be formed to be received in the groove 520 formed on the cooling plate 500 when the upper surface of the cooling plate 500 is brought close to the side surface portion 310 of the secondary battery 300 .

[0078] Due to this structure, the movement of the secondary battery 300 in the longitudinal direction of the secondary battery 300 and in the vertical direction thereof is restricted, thereby preventing the position of the secondary battery 300 from being separated from the cooling plate 500, and achieving the effect of maintaining the arrangement between the secondary battery 300 and the cooling plate 500. In addition, in the secondary battery pack according to the third embodiment, the width of the cooling plate 500 can be further extended compared to the width of the cooling plate 500 according to the first embodiment, thereby achieving the effect of further improving the cooling efficiency.

[0079] Overall, reference Figure 7-12 In the secondary battery pack of the present invention, each of the multiple secondary batteries 300 arranged on the cooling plate 500 can be arranged so that the side surface portion 310 is close to the cooling plate 500 to dissipate the heat of the secondary battery 300, and the movement of the secondary battery 300 relative to the cooling plate 500 in the length direction of the secondary battery 300 is restricted. Therefore, since the extension portion 151 extends out by a predetermined length relative to the side surface portion 310 of the secondary battery 300, the position of the secondary battery 300 can be prevented from being separated from the cooling plate 500, and the effect of maintaining the arrangement between the secondary battery 300 and the cooling plate 500 can be achieved.

[0080] According to the present invention, in a pouch-shaped case and a secondary battery and a secondary battery pack using the same, a perfect cooling structure can be obtained by uniformly forming one side of the secondary battery, thereby achieving the effect of bringing one side surface of the secondary battery close to the cooling plate to maximize cooling efficiency.

[0081] According to the present invention, in a pouch-shaped housing and a secondary battery and a secondary battery pack using the same, the side surface portion of the secondary battery can be formed to be flat rather than protruding, so that for the same battery capacity, a relatively small space can be occupied, thereby achieving an effect of having high energy density.

[0082] So far, the present invention has been described based on exemplary embodiments for illustrating the principles of the present invention, and the present invention is not limited to the construction and operation shown in the drawings and described in the specification. It will be understood by those skilled in the art that the present invention can be implemented in other specific ways other than those described herein without departing from the spirit and basic characteristics of the present invention. Therefore, the above exemplary embodiments are exemplary and not restrictive in any respect. The scope of the present invention is determined by the appended claims, and all changes or modifications derived from the meaning, scope and equivalents of the claims should be interpreted as falling within the scope of the present invention.

Claims

1. A pouch-shaped housing for accommodating and encapsulating an electrode assembly, the pouch-shaped housing comprising: a first accommodating portion and a second accommodating portion, wherein the first accommodating portion and the second accommodating portion are respectively formed to predetermined depths for accommodating the electrode assembly; a sealing portion formed along an exterior of the pouch-shaped housing to surround the first and second accommodating portions; and a connecting portion formed between the first accommodating portion and the second accommodating portion to connect the first accommodating portion and the second accommodating portion, wherein the connecting portion is formed to have the same depth as the first receiving portion and the second receiving portion, And protrusions respectively extend at one end and the other end of the connecting portion in a direction toward the sealing portion from a bottom surface of the connecting portion located inside the bag-shaped case surrounded by the sealing portion.

2. The pouch housing according to claim 1, wherein each of the protrusions comprises: a top portion formed at a predetermined height on a bottom surface of the connecting portion; and An inclined portion is formed at one end of the top portion to be inclined toward a bottom surface of the connecting portion. 3 . The pouch case according to claim 2 , wherein the inclined portion is connected to the top portion and a bottom surface of the connecting portion with a predetermined radius of curvature. The pouch case according to claim 2 , wherein the top portion is formed at the same height as the sealing portion.

5. The bag-shaped housing according to claim 1, wherein: The first receiving portion and one side of the connecting portion are connected to each other along a first fold line; The second receiving portion and the other side of the connecting portion are connected to each other along a second fold line; and The pouch-shaped case is bent along the first fold line and the second fold line to accommodate the electrode assembly. 6 . The pouch case of claim 5 , wherein the first fold line and the second fold line are spaced apart from each other by a distance corresponding to a thickness of the electrode assembly. 7 . The pouch case according to claim 5 , wherein each of the protrusions is formed between the first fold line and the second fold line.

8. A secondary battery comprising: The bag-shaped housing according to claim 1; and an electrode assembly housed in the pouch-shaped casing, The pouch case is configured to accommodate and enclose the electrode assembly in an accommodation space formed by folding the sealing portion to allow the first accommodation portion and the second accommodation portion to face each other.

9. The secondary battery according to claim 8, wherein: The connection portion is configured to uniformly form a side surface of the packaged secondary battery; and The sealing portion includes an extension portion protruding by a predetermined length in a direction perpendicular to the side surface of the secondary battery at portions adjacent to opposite ends of the side surface of the secondary battery. 10 . The secondary battery according to claim 9 , wherein a side surface portion of the secondary battery is not completely recessed or the side surface portion does not protrude, but is formed in a flat and uniform shape. 11 . The secondary battery according to claim 10 , wherein opposite ends of the side surface portion of the secondary battery are formed with depressions recessed toward the inside of the secondary battery at positions corresponding to the protrusions.

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