Pouch outer packaging material and secondary battery using the same

Abstract

To provide a pouch case and a secondary battery using the same.SOLUTION: The present invention relates to a pouch case and a secondary battery using the same. The pouch case includes: a first receiving part and a second receiving part which are concavely formed; a sealing part formed along an outer portion of the pouch case so as to surround the first receiving part and the second receiving part; and a partitioning part formed between the first receiving part and the second receiving part and protruding from a bottom surface of each receiving part to partition the first receiving part and the second receiving part. The partitioning part includes: a first partitioning part which has an upper end formed to have a height lower than that of the sealing part and partitions the first receiving part and the second receiving part at a middle of the partitioning part; a second partitioning part which has an upper surface formed to have the same height as that of the sealing part at both ends of the partitioning part; and a third partitioning part connecting the first partitioning part and the second partitioning part to each other. One side surface of a secondary battery in which an electrode assembly is received and packaged in the pouch case is formed in a plane form. By bringing the flat side surface into close contact with a cooling plate, cooling efficiency of the secondary battery can be maximized.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a pouch exterior material and a secondary battery using the same, and more particularly to a pouch exterior material that can improve cooling efficiency by making one side of a secondary battery using the pouch exterior material adhere to a cooling plate, and a secondary battery using the same. [Background technology]

[0002] Generally, lithium secondary batteries are broadly classified into can-type secondary batteries, in which an electrode assembly is housed in a metal can, and pouch-type secondary batteries, in which an electrode assembly is housed in a pouch exterior material made of an aluminum laminate sheet, depending on the shape of the exterior material.

[0003] Lithium secondary batteries are widely used not only in small mobile devices but also in medium- to large-sized devices such as automobiles, power storage devices, etc. In such cases, a large number of pouch-type secondary batteries, which are easy to stack and lightweight, are connected together to increase capacity and output.

[0004] However, when a battery module is constructed by stacking a number of pouch-type secondary batteries, the temperature of the battery module may rise rapidly due to the accumulation of heat emitted from the number of secondary batteries. Therefore, when constructing a battery module using a number of pouch-type secondary batteries, it is very important to ensure stable and effective cooling performance.

[0005] Therefore, in recent years, research has been conducted into a cooling method in which the side portions of a pouch-type secondary battery come into direct contact with the surface of a cooling plate, as a cooling method that ensures efficient cooling performance and has a simple structure.However, at present, due to limitations on the shape of the pouch exterior material, it has been difficult to effectively bring the side portions of a pouch-type secondary battery into close contact with a cooling plate.

[0006] To solve the above problems, U.S. Patent Registration No. 8,501,343 (pouch-type battery) forms a pair of storage sections in a pouch exterior material as a single space rather than separating them into independent spaces. However, when manufacturing a secondary battery using a pouch exterior material of this shape, there are problems such as the pouch exterior material not being able to be folded and both ends of the side sections being crushed outward during the folding process. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] US8,501,343B2 (2013.08.06.) Summary of the Invention [Problem to be solved by the invention]

[0008] Therefore, the present invention has been made to solve the problems of the prior art, and an object of the present invention is to provide a pouch exterior material in which one side of a secondary battery using the pouch exterior material has a perfect cooling structure, thereby allowing one side of the secondary battery to be in close contact with a cooling plate, thereby maximizing cooling efficiency, and a secondary battery using the same. [Means for solving the problem]

[0009] In order to achieve the above-mentioned object, the pouch exterior material according to the present invention is a pouch exterior material for storing and packaging an electrode assembly, and includes first and second storage sections formed in a concave shape, a seal section formed along the outer edge of the pouch exterior material so as to surround the first and second storage sections, and partition sections formed between the first and second storage sections and protruding from the bottom surfaces of the storage sections to separate the first and second storage sections, wherein the partition sections include a first partition section whose upper end is formed at a height lower than the seal section and which separates the first and second storage sections at the middle of the partition section, second partition sections formed at both ends of the partition section whose upper surfaces are at the same height as the seal section, and a third partition section connecting the first and second partition sections.

[0010] The third partition may be formed at an end of the first partition in the length direction, and inclined toward the second partition.

[0011] The third partition may be connected to the upper ends of the second and first partitions in a rounded shape.

[0012] The first partition portion may include a curved portion having an upper end portion with a curved cross section.

[0013] The first partition may further include a flat portion that linearly connects the first and second storage portions to the curved portion.

[0014] Also, the cross-sectional length of the upper surface of the first partition may be smaller than the sum of the depth of the first receiving portion and the depth of the second receiving portion.

[0015] Furthermore, a secondary battery according to the present invention is a secondary battery including a pouch exterior material and an electrode assembly, wherein the pouch exterior material includes first and second storage sections formed in a concave shape, a seal section formed along the outer edge of the pouch exterior material so as to surround the first and second storage sections, and a partition section formed between the first and second storage sections and protruding from the bottom surface of each storage section to separate the first and second storage sections, wherein the partition section includes: a first partition section whose upper end is formed at a height lower than the seal section and which separates the first and second storage sections at a middle of the partition section; second partition sections whose upper surfaces are formed at both ends of the partition section so as to be flush with the seal section; and a third partition section connecting the first and second compartments, and the electrode assembly can be stored and packaged in a storage space formed by folding the pouch exterior material along the partition section so that the first and second storage sections face each other.

[0016] In addition, the first compartment may be widened to form a flat side surface, and the sealing portion may include extensions that protrude perpendicular to the side surface of the secondary battery at portions adjacent to both ends of the side surface of the secondary battery.

[0017] In addition, the sum of the depth of the first receiving portion and the depth of the second receiving portion of the pouch exterior material may be formed to be the same as the thickness of the electrode assembly.

[0018] The first partition may be widened to form a flat side surface, and concave dimples may be formed on both ends of the side surface.

[0019] Furthermore, a secondary battery pack according to the present invention can include one or more of the secondary batteries, and a cooling plate having a surface that comes into surface contact with a side surface of the secondary battery.

[0020] The sealing portion may include extensions that protrude perpendicularly to the side surface of the secondary battery at portions adjacent to both ends of the side surface of the secondary battery.

[0021] Also, the width between the first and second sides of the cooling plate may correspond to the length between the extensions of the secondary batteries.

[0022] Also, the width between the first and second sides of the cooling plate may be greater than the length between the extensions of the secondary batteries.

[0023] Also, a step may be formed on each of the first and second sides of the cooling plate with a height greater than or equal to the length of the extension of the secondary battery.

[0024] In addition, one or more grooves may be formed on each of the first and second sides of the cooling plate to accommodate the extensions of the secondary batteries, with a depth equal to or greater than the length of the extensions. [Effects of the Invention]

[0025] The pouch exterior material and the secondary battery using the same according to the present invention have a perfect cooling structure on one side of the secondary battery, so that one side of the secondary battery can be in close contact with the cooling plate, thereby maximizing the cooling efficiency. [Brief explanation of the drawings]

[0026] [Figure 1] 1 is an exploded perspective view showing a secondary battery including an electrode assembly and a pouch outer casing according to an embodiment of the present invention; [Figure 2] FIG. 2 is a plan view of the upper side of a pouch exterior material according to one embodiment of the present invention. [Figure 3] FIG. 3 is a cross-sectional view taken along the line AA′ in FIG. 2. [Figure 4] FIG. 3 is a cross-sectional view taken along the line BB′ in FIG. 2. [Figure 5] FIG. 3 is a cross-sectional view taken along line CC′ in FIG. 2. [Figure 6] FIG. 6 is an enlarged view of FIG. [Figure 7] 1 is a cross-sectional view showing a secondary battery according to one embodiment of the present invention. [Figure 8] 1 is an assembled perspective view showing a secondary battery including an electrode assembly and a pouch outer casing according to an embodiment of the present invention; [Figure 9] 10 is a photograph showing a portion where an extension portion and a dimple are formed in a secondary battery of the present invention, and a photograph comparing the portion with a conventional secondary battery in which the height of the partition portion is formed to be the same as the depth of the receiving portion. [Figure 10] 1 is a first exemplary view showing a secondary battery pack formed by combining a secondary battery and a cooling plate according to the present invention; [Figure 11] FIG. 11 is a partially enlarged view of FIG. [Figure 12] FIG. 12 is a partially enlarged view showing the secondary battery and the cooling plate joined together in FIG. [Figure 13] 10 is a second exemplary view showing a secondary battery pack formed by combining a secondary battery and a cooling plate according to the present invention; FIG. [Figure 14] FIG. 14 is a partially enlarged view of FIG. [Figure 15] FIG. 15 is a partially enlarged view showing the secondary battery and the cooling plate joined together in FIG. [Figure 16] 10 is a third exemplary view showing a secondary battery pack formed by combining a secondary battery and a cooling plate according to the present invention; FIG. [Figure 17] FIG. 17 is a partially enlarged view of FIG. [Figure 18] FIG. 18 is a partially enlarged view showing the secondary battery and the cooling plate joined together in FIG. 17. DETAILED DESCRIPTION OF THE INVENTION

[0027] BRIEF DESCRIPTION OF THE DRAWINGS Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, in which: The following detailed description is by way of example only and merely illustrates preferred embodiments of the present invention.

[0028] FIG. 1 is an exploded perspective view showing a secondary battery including an electrode assembly and a pouch outer casing according to one embodiment of the present invention.

[0029] 1, a secondary battery 300 according to the present invention may include a pouch outer casing 100 and an electrode assembly 200 including a plurality of electrode bodies stacked with separators sandwiched therebetween. Here, the pouch outer casing 100 houses and surrounds the electrode assembly 200, and the electrode bodies are packaged by sealing seal portions 150 that abut against each other.

[0030] A first electrode tab 220 and a second electrode tab 230 may be formed on both ends of the electrode assembly 200. In the drawings, the electrode tabs are formed to protrude from both lateral sides of the electrode assembly 200, but the configuration of the electrode tabs in the secondary battery 300 of the present invention is not limited thereto, and both the first electrode tab 220 and the second electrode tab 230 may be disposed on one side of the sealing part 150.

[0031] FIG. 2 is a plan view of the upper side of a pouch exterior material according to one embodiment of the present invention, FIG. 3 is a cross-sectional view taken along line AA' in FIG. 2, FIG. 4 is a cross-sectional view taken along line BB' in FIG. 2, and FIG. 5 is a cross-sectional view taken along line CC' in FIG. 2.

[0032] 2 to 5, a pouch exterior material 100 according to an embodiment of the present invention may include a first storage section 110 and a second storage section 120 formed to store an electrode assembly 200; a sealing section 150 formed along the outer edge of the pouch exterior material 100 to surround the first storage section 110 and the second storage section 120; a first partition section 130 formed upward from the bottom surface forming the first storage section 110 and the second storage section 120, i.e., formed to protrude from the bottom surface in a convex shape toward the inside of the first storage section 110 and the second storage section 120, and whose upper end is formed at a height lower than the sealing section 150, separating the first storage section 110 and the second storage section 120 at a predetermined interval; a second partition section 141 formed to protrude from a side surface connected to the sealing section 150 and a bottom surface connected to the side surface; and a third partition section 142 connecting the first partition section 130 and the second partition section 141.

[0033] A first storage section 110 and a second storage section 120 for storing the electrode assembly 200 may be formed within the pouch exterior material 100. The first storage section 110 and the second storage section 120 may be formed in a concave shape recessed downward in the height direction of the flat-plate-shaped pouch exterior material 100, and may be formed by pressing the inside of the pouch exterior material 100 by a method such as pressing. Here, each of the first storage section 110 and the second storage section 120 has a size corresponding to the width and length of the electrode assembly 200, and the sum of the depths of the first storage section 110 and the second storage section 120 may be formed to correspond to the thickness of the electrode assembly 200. In this case, the depths of the first and second receiving sections 110 and 120 are linear distances from the top surface of the sealing section 150 to the bottom surfaces of the first and second receiving sections 110 and 120, respectively, and the depth of the first receiving section 110 may be uniform in both the width and length directions, and the depth of the second receiving section 120 may also be uniform in both the width and length directions. Also, although the drawings show the first and second receiving sections 110 and 120 having the same depth, the depths of the first and second receiving sections 110 and 120 may be different from each other.

[0034] The sealed portion 150 is a portion that does not become depressed when the inside of the pouch outer casing material 100 formed in a flat plate shape is pressed by a method such as pressing to form the first storage section 110 and the second storage section 120. In other words, the portion formed along the outer edge of the pouch outer casing material 100 so as to surround the first storage section 110 and the second storage section 120 can be the sealed portion 150.

[0035] The first partition 130 is formed to protrude convexly upward in the height direction from the bottom surface between the first storage section 110 and the second storage section 120, and is formed to extend along the length direction, dividing the first storage section 110 and the second storage section 120 in the width direction. Here, when the inside of the pouch exterior material 100 formed in a flat plate shape is pressed by a method such as pressing to form the first storage section 110 and the second storage section 120, the first partition 130 can be formed so that it is concave on the outside of the first storage section 110 and the second storage section 120 and convex on the inside by pressing the pouch exterior material in a state where a convex portion in a shape corresponding to the first partition 130 is formed in a lower mold. In this case, the upper end of the first partitioning portion 130 is formed at a height lower than the sealing portion 150, and both ends of the first partitioning portion 130 in the longitudinal direction may be formed to a position spaced a predetermined distance from both sides of the first storage portion 110 and the second storage portion 120 in the longitudinal direction.

[0036] The second partition 141 is a component that facilitates folding without distortion of both longitudinal ends of the side surface 310 of the secondary battery 300 when the seal unit 150 is folded so that the first and second housing units 110 and 120 face each other to form a housing space in the pouch exterior material 100 for housing the electrode assembly 200. The second partition 141 may be formed to protrude from both longitudinal side surfaces of the first and second housing units 110 and 120 and from bottom surfaces connected to both longitudinal side surfaces, and may be formed so that its top surface is flush with the seal unit 150. Here, similar to the first partition 130, the second partition 141 may be formed so as to be concave on the outside of the first and second housing units 110 and 120 and convex on the inside by being pressed using a press or the like. Also, although the width of the second partition portion 141 is shown to be larger than that of the sealing portion 150, this is not limited to this, and the width of the second partition portion 141 can be adjusted depending on the thickness T and shape of the electrode assembly 200 or the material of the pouch outer casing 100.

[0037] The third compartment 142 is a portion that smoothly connects both longitudinal ends of the first compartment 130 to the second compartment 141. Like the first compartment 130 and the second compartment 141, the third compartment 142 can be formed by pressing using a press or the like to be concave on the outside of the first storage section 110 and the second storage section 120 and convex on the inside. By pressing the pouch exterior material in a state where convex portions corresponding to the shapes of the first compartment 130, the third compartment 142, and the second compartment 141 are formed in a lower mold, the first compartment 130, the third compartment 142, and the second compartment 141 can be integrally formed so as to be connected to each other. In this case, the third partition 142 may be formed to be inclined from the upper end of the first partition 130 in the length direction toward the upper end of the second partition 141 so that the upper end of the first partition 130 and the upper end of the second partition 141 are naturally connected. In addition, the portion where the third partition 142 is connected to the upper end of the first partition 130 and the portion where the third partition 142 is connected to the upper end of the second partition 141 may be formed to be rounded with a predetermined radius of curvature. In addition, both side surfaces in the width direction of the third partition 142 may be formed to be inclined from the end side surfaces of the first partition 130 in the length direction toward the side surfaces of the second partition 141, and the connected portions may be formed to be rounded.

[0038] In this way, by forming the second compartment 141, the third compartment 142, and the first compartment 130 so that they are smoothly connected without any discontinuous gradient, it is possible to prevent damage or tearing of the portions of the second compartment 141 and the third compartment 142 located on the side portion 310 of the secondary battery 300 when the pouch outer casing material 100 is folded.

[0039] FIG. 6 is an enlarged view of FIG.

[0040] 6, the first partition 130 is a component that connects the first receiving section 110 and the second receiving section 120 at a predetermined distance, and extends the bottom surfaces of the first receiving section 110 and the second receiving section 120 to connect them to each other. One side of the first partition 130 is connected to the bottom surface of the first receiving section 110, and the other side of the first partition 130 is connected to the bottom surface of the second receiving section 120. The upper end of the first partition 130 may be formed at a height lower than the sealing section 150, and the first partition 130 separates the first receiving section 110 and the second receiving section 120. Also, as shown, the first partition section 130 has a flat portion 132 extending linearly upward from the bottom surface of the first storage section 110, and a flat portion 132 extending linearly upward from the bottom surface of the second storage section 120, and a semicircular curved portion 131 can be formed at the upper ends of the pair of flat portions 132.

[0041] As a result, when manufacturing the secondary battery 300 using the pouch exterior material 100 according to the first embodiment of the present invention, the pouch exterior material 100 may be folded along the center line of the first compartment 130 so that the first housing portion 110 and the second housing portion 120 face each other, and the electrode assembly 200 may be accommodated in the accommodation space formed therein, and then the overlapping seal portion 150 may be sealed for packaging. Here, when the pouch exterior material 100 is folded, the electrode assembly 200 accommodated in the accommodation space may be supported and expanded by the electrode assembly 200.

[0042] FIG. 7 is a cross-sectional view showing a secondary battery according to one embodiment of the present invention, and FIG. 8 is an assembled perspective view showing a secondary battery including an electrode assembly and a pouch outer casing according to one embodiment of the present invention.

[0043] 7 and 8, the first compartment 130 may be unfolded when the secondary battery 300 is assembled, and may be formed as a flat, planar side portion 310. In addition, after the secondary battery 300 is manufactured, it may be possible to prevent portions of the sealing portion 150 located at both ends of the side portion 310 of the secondary battery 300 in the longitudinal direction from being folded or crushed.

[0044] In addition, the cross-sectional length of the upper surface of the first partition 130 may be formed to be smaller than the sum of the depth A1 of the first receiving portion 110 and the depth A2 of the second receiving portion 120.

[0045] Here, the upper surface of the first compartment 130 faces the first storage portion 110 and the second storage portion 120. Referring to FIG. 6, the cross-sectional length of the upper surface of the first compartment 130 is the sum (B1+B2+B3) of the length (B1+B2) of the pair of flat portions 132 and the length (B3) of the curved portion 131. Therefore, the first compartment 130 may be formed so that A1+A2>B1+B2+B3. The sum (A1+A2) of the depth A1 of the first storage portion and the depth A2 of the second storage portion may be formed so that A1+A2=T, similar to the thickness T of the electrode assembly. In this case, the sum (A1+A2) of the depth A1 of the first storage portion and the depth A2 of the second storage portion may be formed so that A1+A2=T, depending on the material and shape of the pouch exterior material 100.

[0046] As a result, when manufacturing a secondary battery 300 using the pouch exterior material 100 of one embodiment of the present invention, when the pouch exterior material 100 is folded so that the electrode assembly 200 is stored in the storage space of the pouch exterior material 100, the first compartment portion 130 is expanded and stretched, so that after the secondary battery 300 is manufactured, the first compartment portion 130, which becomes the side portion 310 of the secondary battery 300, can be formed as a flat side portion 310 when the secondary battery 300 is assembled.

[0047] Here, the height of the first compartment 130 may be smaller than the depth of the first storage section 110 and the second storage section 120, and may be formed to be at least half the depth of the first storage section 110 and the second storage section 120. The height of the first compartment 130 may be preferably at least two-thirds, more preferably at least four-fifths, of the depth of the first storage section 110 and the second storage section 120. That is, when the height of the first compartment 130 satisfies the above condition, the shape of the first compartment 130 does not appear on the side surface 310 of the secondary battery, and the side surface can be formed flat. Furthermore, since stress concentration on the folded side surface of the folded pouch exterior material can be prevented, the productivity, cooling efficiency, and energy density of the secondary battery can all be improved.

[0048] In addition, a secondary battery 300 using the pouch exterior material 100 of the present invention can be constructed to include the pouch exterior material 100 of the present invention and an electrode assembly 200, and the pouch exterior material 100 is sealed along the sealing portion 150 after the electrode assembly 200 is stored in a storage space formed by folding the sealing portion 150 so that the first storage section 110 and the second storage section 120 face each other.

[0049] As shown, the first compartment 130 of the pouch outer casing 100 uniformly forms the side surface 310 of the secondary battery 300, and dimples 320 recessed into the interior of the secondary battery 300 can be formed at both ends of the length of the side surface 310 of the secondary battery 300 at positions corresponding to the second compartment 141 and the third compartment 142.

[0050] FIG. 9 is a photograph showing the portion of the secondary battery of the present invention where the extension portion and dimples are formed, and a photograph comparing the portion with a conventional secondary battery in which the height of the partition portion is formed to be the same as the depth of the storage portion.

[0051] 9, for example, the secondary battery of the present invention has no recessed portion on the side surface, and recessed dimples are formed at the edge of the side surface, as shown in the upper image, whereas the conventional secondary battery may have recessed portions along the side surface, as shown in the lower image.

[0052] The dimples 320 function to guide the seal portions 150 on both ends of the side portion 310 so that they can be easily folded when the pouch exterior material 100 is folded, and their size and shape can have various forms depending on the thickness T and shape of the electrode assembly 200, or the height or width of the second compartment portion 141, which is appropriately adjusted depending on the material of the pouch exterior material 100.

[0053] As shown, the secondary battery 300 using the pouch exterior material 100 according to the present invention is characterized in that the side surface 310 has a flat and uniform shape without any overall recesses or protrusions. As a result, the secondary battery 300 according to the present invention can achieve complete adhesion when the side surface 310 contacts the cooling plate 500 for cooling, resulting in low thermal resistance and high heat dissipation efficiency.

[0054] In addition, the secondary battery 300 according to the present invention has a uniformly formed side surface 310 without protruding, and therefore occupies less space for the same battery capacity compared to a case where the side surface 310 is bent outward or has a separate sealing portion that causes it to protrude, thereby providing an advantage that the secondary battery 300 according to the present invention can have a high energy density.

[0055] In addition, the sealing portions 150 located adjacent to both ends of the side surface portion 310 of the secondary battery 300 may include extension portions 151 that protrude by a predetermined length in a direction perpendicular to the side surface portion 310 of the secondary battery 300 during the process of folding for packaging. As a result, a space corresponding to the length L of the extension portion 151 may be formed between the extension portion 151 and the side surface portion 310.

[0056] The extension portion 151 formed as described above can serve to maintain or fix the position of the secondary battery 300 relative to the cooling plate 500 by forming a groove 520 or a step 510 capable of accommodating the extension portion 151 on the side of the cooling plate 500 when combining the secondary battery 300 of the present invention with the cooling plate 500 to manufacture a secondary battery pack.

[0057] 10 to 18 are diagrams showing first to third examples of secondary battery packs in which a secondary battery 300 according to the present invention is combined with a cooling plate 500. FIG.

[0058] First, FIGS. 10 to 12 are a first example of a secondary battery pack according to the present invention and an enlarged detailed view thereof.

[0059] 10, a plurality of secondary batteries 300 according to the present invention may be arranged on a cooling plate 500 to form a secondary battery pack. Here, the cooling plate 500 has a first side surface, a second side surface opposite to the first side surface, and an upper surface that is in surface contact with the side surface portions 310 of one or more secondary batteries 300.

[0060] 10, the width between the first and second sides of the cooling plate 500 may correspond to the length between the extensions 151 of the secondary batteries 300. Referring to FIGS. 11 and 12, in this case, the cooling plate 500 may be sandwiched between the extensions 151 of the secondary batteries 300 when the upper surface of the cooling plate 500 is in close contact with the side surface 310 of the secondary batteries 300.

[0061] With this structure, the secondary battery 300 is restricted from moving in the longitudinal direction thereof, and is prevented from moving away from its position on the cooling plate 500, thereby maintaining the arrangement of the secondary battery 300 and the cooling plate 500.

[0062] 13 to 15 are diagrams showing a second example of a secondary battery pack according to the present invention and enlarged detailed views thereof.

[0063] 13, the width between the first and second side surfaces of the cooling plate 500 is greater than the length between the extensions 151 of the secondary batteries 300, and a step 510 having a height greater than or equal to a predetermined protruding length of the extensions 151 of the secondary batteries 300 may be formed on each of the first and second side surfaces of the cooling plate 500. Referring to FIGS. 14 and 15, when the upper surface of the cooling plate 500 is in close contact with the side surface 310 of the secondary battery 300, the extensions 151 of the secondary batteries 300 may be placed on the step formed on the cooling plate 500.

[0064] This structure has the effect of restricting the movement of the secondary battery 300 in the length direction of the secondary battery 300, preventing it from being dislodged from its position on the cooling plate 500, and maintaining the arrangement of the secondary battery 300 and the cooling plate 500. In addition, in the secondary battery pack according to the second example, the width of the cooling plate 500 is greater than the width of the cooling plate 500 according to the first example, which has the effect of further increasing the cooling efficiency.

[0065] 16 to 18 are views showing a third example of a secondary battery pack according to the present invention and enlarged detailed views thereof.

[0066] 16, the width between the first and second sides of the cooling plate 500 may be greater than the length between the extensions 151 of the secondary batteries 300, and one or more grooves 520 may be formed in each of the first and second sides of the cooling plate 500 with a depth greater than or equal to a predetermined length of the extensions 151 to accommodate the extensions 151 of the secondary batteries 300. Referring to FIGS. 17 and 18, when the upper surface of the cooling plate 500 is in close contact with the side surface 310 of the secondary battery 300, the extensions 151 of the secondary batteries 300 may be accommodated in the grooves 520 formed in the cooling plate 500.

[0067] With this structure, the movement of the secondary battery 300 is restricted not only in the length direction of the secondary battery 300 but also in the direction perpendicular thereto, preventing the secondary battery 300 from moving away from its position on the cooling plate 500 and maintaining the arrangement of the secondary battery 300 and the cooling plate 500. In addition, in the secondary battery pack according to the third example, the width of the cooling plate 500 is greater than that of the cooling plate 500 according to the first example, which further increases the cooling efficiency.

[0068] To summarize the matters shown in Figures 10 to 18, in the secondary battery pack of the present invention, each of the multiple secondary batteries 300 arranged on the cooling plate 500 is arranged so that its side portion 310 is in close contact with the cooling plate 500, thereby enabling heat dissipation from the secondary batteries 300, and the extension portion 151 protruding a predetermined length from the side portion 310 of the secondary battery 300 restricts movement of the secondary battery 300 in the lengthwise direction relative to the cooling plate 500, preventing it from moving away from its position on the cooling plate 500, thereby having the effect of maintaining the arrangement of the secondary battery 300 and the cooling plate 500.

[0069] While the present invention has been described and illustrated above based on preferred embodiments for illustrating the principles of the invention, the present invention is not limited to the exact configuration and operation so shown and described. Those skilled in the art will understand that the present invention can be embodied in other specific forms without changing the technical spirit or essential characteristics of the present invention. Therefore, the above-described embodiments should be understood to be illustrative in all respects and not restrictive. The scope of the present invention is defined by the claims that follow, and all changes and modifications derived from the meaning and scope of the claims and their equivalents should be construed as being within the scope of the present invention. [Explanation of symbols]

[0070] 100 pouch outer packaging 110 First storage section 120 Second storage section 130 First Section 131 Curved surface part 132 Plane section 141 Second Section 142 Third Section 150 Seal part 151 Extension L Extension length 200 electrode assembly 220 First electrode tab 230 Second electrode tab 300 Secondary battery 310 Side part 320 dimples 500 cooling plate 510 steps 520 Groove

Claims

1. A pouch outer packaging material for housing and packaging an electrode assembly, a first storage section and a second storage section formed in a concave shape and arranged in a width direction; a seal portion formed along an outer edge of the pouch exterior material so as to surround the first storage portion and the second storage portion; a partition formed between the first storage section and the second storage section, protruding from a bottom surface of each storage section, and separating the first storage section from the second storage section; The partition section is a first partition portion whose upper end is formed at a height lower than the sealing portion and which partitions the first storage portion and the second storage portion at a middle of the partition portion; second compartments extending toward the first compartment at both ends of the length of each storage section; The width of the second partition is formed larger than the width of the first partition, The pouch exterior material, wherein the first compartment portion includes a curved portion having an upper end portion with a curved cross section.

2. The device further includes a third partition portion connecting the first partition portion and the second partition portion, The pouch exterior material according to claim 1 , wherein the width of the third compartment is gradually reduced from the width of the second compartment to the width of the first compartment.

3. The pouch exterior material according to claim 2 , wherein the third compartment is formed at an end of the first compartment in the longitudinal direction so as to be inclined toward the second compartment.

4. The pouch exterior material according to claim 3 , wherein the third compartment is connected to the upper end portions of the second compartment and the first compartment in a rounded shape.

5. The pouch exterior material according to claim 1 , wherein the first partition further includes a flat portion that linearly connects the first storage portion and the second storage portion to the curved portion.

6. 6. The pouch exterior material according to claim 5, wherein a cross-sectional length of the upper side surface of the first partition section is formed to be smaller than the sum of the depths of the first storage section and the second storage section.

7. 3. The pouch exterior material according to claim 2, wherein the second compartment, the third compartment, and the first compartment are formed in a concave shape on the outside of the first storage section and the second storage section, and in a convex shape on the inside.

8. The pouch outer covering material according to claim 2 , wherein the second compartment, the third compartment, and the first compartment are smoothly connected to each other so as to have a continuous gradient.

9. 2. The pouch exterior material according to claim 1, wherein the height of the first partition section is smaller than the depth of the first storage section and the second storage section, and is formed to be at least half the depth of the first storage section and the second storage section.

10. A secondary battery including a pouch exterior material and an electrode assembly, The pouch exterior material is a first storage section and a second storage section formed in a concave shape and arranged in a width direction; a seal portion formed along an outer edge of the pouch exterior material so as to surround the first storage portion and the second storage portion; a partition formed between the first storage section and the second storage section, protruding from a bottom surface of each storage section, and separating the first storage section from the second storage section; The partition section is a first partition portion whose upper end is formed at a height lower than the sealing portion and which partitions the first storage portion and the second storage portion at a middle of the partition portion; second compartments extending toward the first compartment at both ends of the length of each storage section; The width of the second partition is formed larger than the width of the first partition, the first partition portion includes a curved surface portion having a curved cross section at an upper end portion, The secondary battery is packaged by folding the pouch exterior material along the partition so that the first and second storage sections face each other, forming a storage space in which the electrode assembly is stored.

11. The device further includes a third partition portion connecting the first partition portion and the second partition portion, The secondary battery of claim 10 , wherein the width of the third compartment gradually decreases from the width of the second compartment to the width of the first compartment.

12. The first compartment is widened to form a flat side surface, The sealing portion is The secondary battery according to claim 10 , further comprising extensions that protrude in a direction perpendicular to the side surface of the secondary battery at portions adjacent to both ends of the side surface of the secondary battery.

13. The first compartment is widened to form a flat side surface, The secondary battery according to claim 10 , wherein concave dimples are formed on both ends of the side surface portion.

14. One or more secondary batteries according to claim 12; a cooling plate having a surface that is in surface contact with a side portion of the secondary battery.

15. The sealing portion is The secondary battery pack according to claim 14 , further comprising extensions that protrude perpendicularly to the side surfaces of the secondary batteries at portions adjacent to both ends of the side surfaces of the secondary batteries.

16. The secondary battery pack according to claim 15 , wherein a width between the first side and the second side of the cooling plate corresponds to a length between the extensions of the secondary battery.

17. The secondary battery pack according to claim 15 , wherein a width between the first side and the second side of the cooling plate is greater than a length between the extension portions of the secondary battery.

18. The secondary battery pack of claim 17 , wherein a step is formed on each of the first and second sides of the cooling plate with a height greater than or equal to the length of the extension of the secondary battery.

19. 18. The secondary battery pack of claim 17, wherein one or more grooves are formed in each of the first and second sides of the cooling plate to accommodate the extensions of the secondary batteries, the grooves having a depth greater than or equal to the length of the extensions.

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