Apparatus for molding secondary battery pouch and secondary battery pouch manufactured by same

Abstract

The present invention relates to an apparatus for forming a secondary battery pouch and a secondary battery pouch manufactured by the same, and more particularly, to an apparatus for forming a secondary battery pouch, which enables a pouch bridge portion to be well unfolded when the pouch is folded, and a secondary battery pouch manufactured by the same, and to a secondary battery pouch manufactured by the same. A secondary battery having excellent quality is produced by preventing damage to a battery cell, improving positioning accuracy of the battery cell, and preventing wrinkles on a sealing portion of the battery cell.

Description

Technical Field

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of priority from Korean Patent Application No. 10-2022-0110313, filed on August 31, 2022, the entire contents of which are incorporated herein by reference. Technical Field

[0004] The present invention relates to an apparatus for molding a secondary battery bag and a secondary battery bag manufactured by the apparatus, and more particularly, to an apparatus for molding a secondary battery bag and a secondary battery bag manufactured by the apparatus, wherein the apparatus enables a bag bridging portion to unfold well when the bag is folded to prevent damage to the battery cell, improve the battery cell positioning accuracy and prevent wrinkles on the battery cell sealing portion, thereby producing a secondary battery with excellent quality. Background Art

[0005] In recent years, as energy prices have risen due to the depletion of fossil fuels, concerns about environmental pollution have been amplified, and the demand for eco-friendly alternative energy is becoming an indispensable factor in future life. Therefore, research on various power generation technologies such as solar energy, wind energy, and tidal energy is continuing, and power storage devices such as batteries for more efficient use of generated electrical energy are also attracting attention.

[0006] In addition, as technology develops and demand for electronic mobile devices and electric vehicles using batteries increases, demand for batteries as energy sources is rapidly increasing. Therefore, many studies have been conducted on batteries that can meet various needs.

[0007] In particular, in terms of materials, there is a high demand for lithium secondary batteries such as lithium ion batteries and lithium ion polymer batteries having advantages such as high energy density, high discharge voltage, and high output stability.

[0008] According to the shape of a battery case, secondary batteries are classified into cylindrical batteries and prismatic batteries in which an electrode assembly is built in a cylindrical or prismatic metal can, and pouch-type batteries in which an electrode assembly is built in a pouch-type case made of an aluminum laminate.

[0009] Figure 1 is a cross-sectional view of a pouch-type secondary battery according to the related art. In detail, Figure 1 is a cross-sectional view illustrating a pouch of a secondary battery and an electrode assembly built in the pouch.

[0010] The pouch-type secondary battery 1 includes an electrode assembly 20 in which electrodes and separators are alternately stacked and a pouch 10 into which the electrode assembly is inserted. In addition, the pouch includes cups 11 and 12 of the pouch, each of which has a concave shape so as to directly accommodate the electrode assembly. The cup of the pouch may be provided with a left cup 11 and a right cup 12 to surround the electrode assembly on both sides of the electrode assembly.

[0011] The portion connecting the left cup portion 11 and the right cup portion 12 may be a bag bridge portion 13. The left cup portion 11 may be folded to the upper portion of the right cup portion 12 relative to the bag bridge portion 13. During this folding process, the cup portions 11 and 12 of the bag may form an accommodation space, and the electrode assembly 20 may be accommodated in the accommodation space.

[0012] Reference Figure 1 In the related art, when the left cup portion 11 is folded to the upper part of the right cup portion 12, there is a problem that the bag bridge portion 13 is not well unfolded. As the capacity of the secondary battery becomes larger and larger, the depth of the bag molding increases, resulting in an increase in the thickness of the bag. As a result, when the bag is folded after molding, such as Figure 1 As shown, there is a problem that the bag bridging portion 13 is not well unfolded. As described above, if the bag bridging portion 13 is not well unfolded and therefore has a shape protruding toward the electrode assembly 20, a situation in which the battery cell of the electrode assembly 20 is damaged by the bag bridging portion 13 may occur. In addition, if the bag bridging portion 13 is not well unfolded, the appearance of the battery cell may not be accurately formed, and therefore, the position may not be accurately measured by a visual camera or the like. This will result in reduced positioning accuracy. In addition, if the bag bridging portion 13 is not well unfolded, a wrinkle problem may occur when sealing the periphery of the bag due to reduced accuracy. Therefore, when folding the bag, it is highly necessary to ensure that the bag bridging portion 13 is well unfolded. Summary of the invention

[0013] Technical issues

[0014] The present invention is invented to solve the above-mentioned problems, and an object of the present invention is to provide an apparatus for molding a secondary battery bag and a secondary battery bag manufactured by the apparatus, which enables the bag bridging portion to unfold well when the bag is folded to prevent damage to the battery cell, improve the battery cell positioning accuracy and prevent wrinkles on the battery cell sealing portion, thereby producing a secondary battery with excellent quality.

[0015] Technical Solution

[0016] According to the present invention, an apparatus for molding a secondary battery bag comprises: a mold, in which a receiving groove for molding a cup portion of the bag is defined on a base surface on which the bag is placed; and a punch, which is inserted into the receiving groove of the mold to mold the cup portion of the bag, wherein the mold comprises: a left receiving groove, the left receiving groove having a concave shape; a right receiving groove, the right receiving groove being defined in a side portion of the left receiving groove and having a concave shape; and a bridging portion, the bridging portion being configured to connect the left receiving groove to the right receiving groove between the left receiving groove and the right receiving groove, wherein the bridging portion has a concave shape so that the height of the central portion of the bridging portion in the length direction is less than the height of each of the two end portions.

[0017] The bridge portion may have a height that continuously decreases from each of the two end portions to the central portion.

[0018] A cross section of the bridge portion cut by a virtual vertical plane dividing the left and right receiving grooves while passing through the bridge portion may have a shape similar to a portion or the entirety of a U-shape.

[0019] A cross section of the bridge portion cut by a virtual vertical plane dividing the left and right receiving grooves while passing through the bridge portion may have a shape similar to a portion or the entirety of a circle or an ellipse.

[0020] A central portion of the bridge portion may have a height of 9 mm to 10 mm, and each of both end portions of the bridge portion may have a height of 11 mm to 12 mm.

[0021] The punch may include a punch protrusion having a shape protruding to correspond to a concave shape of the bridge portion.

[0022] According to the present invention, the equipment for molding a secondary battery bag includes: a mold, in which a receiving groove for molding a cup portion of the bag is defined on a base surface on which the bag is placed; and a punch, which is inserted into the receiving groove of the mold to mold the cup portion of the bag, wherein the mold includes: a left receiving groove, the left receiving groove having a concave shape; a right receiving groove, the right receiving groove being defined in a side portion of the left receiving groove and having a concave shape; and a bridging portion, the bridging portion being configured to connect the left receiving groove to the right receiving groove between the left receiving groove and the right receiving groove, wherein each of the left receiving groove and the right receiving groove has a horizontal bottom surface in a central area and an inclined bottom surface in each of two end areas, based on a direction parallel to a length direction of the bridging portion.

[0023] In the both end regions, a bottom surface of each of the left and right receiving grooves may be inclined such that a height of the bottom surface increases as approaching the bridge portion.

[0024] The bottom surfaces of the left and right receiving grooves may form an inclination angle of 1 to 10 degrees relative to a horizontal plane.

[0025] Each of the left accommodating groove and the right accommodating groove may include a bottom surface and a side wall surface extending upward from the periphery of the bottom surface, and the side wall surface of the left accommodating groove measured with the bottom surface of the left accommodating groove as a reference may have the same height in the central area and the two end areas.

[0026] A side wall surface of the right receiving groove measured with reference to a bottom surface of the right receiving groove may have the same height at the central region and the two end regions.

[0027] The left receiving groove and the right receiving groove may be defined in shapes symmetrical to each other with respect to the bridge portion.

[0028] According to the present invention, an apparatus for molding a secondary battery bag comprises: a mold, in which a receiving groove for molding a cup portion of the bag is defined on a base surface on which the bag is placed; and a punch, which is inserted into the receiving groove of the mold to mold the cup portion of the bag, wherein the mold comprises: a left receiving groove, the left receiving groove having a concave shape; a right receiving groove, the right receiving groove being defined in a side portion of the left receiving groove and having a concave shape; and a bridging portion, the bridging portion being configured to connect the left receiving groove to the right receiving groove between the left receiving groove and the right receiving groove, wherein the bridging portion has a concave shape so that the height of the central portion in the length direction is less than the height of each of the two end portions, and with respect to a direction parallel to the length direction of the bridging portion, each of the left receiving groove and the right receiving groove has a horizontal bottom surface at the central region, and has an inclined bottom surface at each of the two end regions.

[0029] A secondary battery bag according to the present invention includes: a bag cup portion, the bag cup portion including two cup portions, a left cup portion and a right cup portion; and a bag bridging portion, the bag bridging portion being configured to connect the two cup portions to each other between the left cup portion and the right cup portion, wherein the bag bridging portion may have a concave shape so that the height of the central portion in the length direction is less than the height of each of the two end portions.

[0030] The central portion of the bag bridge portion may have a height of 2 mm to 4 mm, and each of the two end portions of the bag bridge portion may have a height of 4 mm to 6 mm.

[0031] A secondary battery bag according to the present invention may include: a bag cup portion, the bag cup portion including two cup portions, a left cup portion and a right cup portion; and a bag bridging portion, the bag bridging portion being configured to connect the two cup portions to each other between the left cup portion and the right cup portion, wherein each of the left cup portion and the right cup portion has a horizontal bottom surface at a central area and has an inclined bottom surface at each of two end areas, with reference to a direction parallel to a length direction of the bridging portion.

[0032] A secondary battery bag may include: a bag cup portion, the bag cup portion including two cup portions, a left cup portion and a right cup portion; and a bag bridging portion, the bag bridging portion being configured to connect the two cup portions to each other between the left cup portion and the right cup portion, wherein the bag bridging portion has a concave shape so that the height of the central portion in the length direction is less than the height of each of the two end portions, and with respect to a direction parallel to the length direction of the bridging portion as a reference, each of the left cup portion and the right cup portion has a horizontal bottom surface at a central region, and has an inclined bottom surface at each of the two end regions.

[0033] Beneficial Effects

[0034] In an apparatus for molding a secondary battery pouch and a secondary battery pouch manufactured by the apparatus, a pouch bridge portion can be well unfolded when the pouch is folded to prevent battery cell damage, improve battery cell positioning accuracy, and prevent wrinkles on a battery sealing portion, thereby producing a secondary battery with excellent quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a cross-sectional view of a pouch-type secondary battery according to the related art.

[0036] Figure 2 is a perspective view illustrating a mold of an apparatus for molding a secondary battery pouch according to Embodiment 1 of the present invention.

[0037] Figure 3 is along Figure 2 A cross-sectional view of the bridge portion taken along line CC'.

[0038] Figure 4 (a) is a perspective view illustrating a punch of an apparatus for manufacturing a secondary battery pouch according to Embodiment 1 of the present invention.

[0039] Figure 4 (b) is a diagram Figure 4 (a) is a cross-sectional view of the punch shown.

[0040] Figure 5 is a perspective view illustrating a secondary battery pouch manufactured by the apparatus for molding a secondary battery pouch according to Embodiment 1 of the present invention.

[0041] Figure 6 is a perspective view illustrating a mold of an apparatus for molding a secondary battery pouch according to Embodiment 2 of the present invention.

[0042] Figure 7 is Figure 6 Cross-sectional view taken at the S1 position.

[0043] Figure 8 is Figure 6 Cross-sectional views taken at positions S2 and S3.

[0044] Fig. 9 is a perspective view illustrating a secondary battery pouch manufactured by the apparatus for molding a secondary battery pouch according to Embodiment 2 of the present invention.

[0045] Fig.10 is Fig. 9 Cross-sectional view taken at position P1.

[0046] Fig.11 is Fig. 9 Cross-sectional views taken at positions P2 and P3.

[0047] Fig.12 is a perspective view illustrating a mold of an apparatus for molding a secondary battery pouch according to Embodiment 3 of the present invention. DETAILED DESCRIPTION

[0048] Hereinafter, the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention. However, the present invention can be implemented in many different forms and is not limited or constrained by the following examples.

[0049] In order to clearly illustrate the present invention, the detailed description of the related known technology that is irrelevant to the description or may unnecessarily obscure the gist of the present invention is omitted, and in this application, reference numerals are added to the components in each accompanying drawing. In this case, the same or similar reference numerals are assigned to the same or similar elements throughout the application.

[0050] Furthermore, the terms or words used in the specification and claims should not be restrictively interpreted as ordinary meanings or dictionary-based meanings, but should be interpreted as meanings and concepts consistent with the scope of the present invention based on the principle that the inventor can appropriately define the concepts of the terms to best describe and interpret his or her invention.

[0051] Implementation Method 1

[0052] Figure 2is a perspective view illustrating a mold of an apparatus for molding a secondary battery pouch according to Embodiment 1 of the present invention. Figure 3 is along Figure 2 A cross-sectional view of the bridge portion taken along line CC'. Figure 4 (a) is a perspective view illustrating a punch of an apparatus for manufacturing a secondary battery pouch according to Embodiment 1 of the present invention. Figure 4 (b) is a diagram Figure 4 (a) is a cross-sectional view of the punch shown. Figure 5 is a perspective view illustrating a secondary battery pouch manufactured by the apparatus for molding a secondary battery pouch according to Embodiment 1 of the present invention.

[0053] Reference Figures 2 to 5 , the apparatus 100 for molding a secondary battery pouch according to Embodiment 1 of the present invention may include a mold 110 and a punch 150 .

[0054] The mold 110 may be configured to have a receiving groove for forming the cup portion 133 of the bag on the base surface 113 on which the bag is placed.

[0055] Specifically, the mold 110 includes a left receiving groove 111 having a concave shape, a right receiving groove 112 formed in a side portion of the left receiving groove 111 and having a concave shape, and a bridge portion 120 connecting the left receiving groove 111 to the right receiving groove 112 between the left receiving groove 111 and the right receiving groove 112.

[0056] The punch 150 may be configured to form a cup portion of the bag while being inserted into the receiving groove of the mold 110. A bag substrate having a flat shape may be placed on the base surface 113, and then the punch 150 may be lowered to form the bag. The punch 150 may form the bag into a shape corresponding to the shape of the mold 110. The bag may be formed while the punch 150 is inserted into the groove having a concave shape of the mold 110. The bag formed in this manner may have a shape corresponding to the shape of the mold 110. Figure 5 The secondary battery pouch 130 shown has the same shape.

[0057] In the apparatus 100 for molding a secondary battery bag according to Embodiment 1 of the present invention, the bridge 120 may have a concave shape such that the height of the central portion 121 of the bridge 120 in the length direction L is smaller than the height of each of the two end portions 122. Figure 2 and Figure 3 , the height of the bridge portion 120 may be continuously reduced from the two end portions 122 to the central portion 121 .

[0058] Reference Figure 3In the bridge portion 120, a cross section cut by a virtual vertical plane that divides the left and right receiving grooves while passing through the bridge portion 120 may have a shape similar to a part or all of a U-shape. When cut in the virtual vertical plane, a cross section may be presented as follows: Figure 3 The cross-sectional shape of the bridge portion 120 is shown. Figure 3 As shown, the cross section of the bridge portion 120 taken along CC′ may be in a curved shape, and in particular, the cross section may be configured as a part or the whole of a U-shape.

[0059] Furthermore, in the bridge portion 120 , a cross section cut by a virtual vertical plane dividing the left and right receiving grooves while passing through the bridge portion 120 may have a shape similar to a part or all of a circle or an ellipse.

[0060] Reference Figure 3 , the height h1 of the central portion 121 of the bridge 120 may be 9 mm to 10 mm, and the height h2 of each of the two end portions 122 of the bridge 120 may be 11 mm to 12 mm. Therefore, the bridge 120 may have a shape in which each of the two end portions 122 is higher and the height decreases toward the central portion 121.

[0061] Reference Figure 4 (a), the punch 150 may include a punch protrusion 151 having a shape protruding to correspond to the concave shape of the bridge portion 120. The punch protrusion 151 may be a portion provided at a position corresponding to the bridge portion 120 of the mold 110. The bag base material may be provided between the punch protrusion 151 of the mold 110 and the bridge portion 120 and then pressed. Therefore, the bag bridge portion 140 may be formed into a shape corresponding to the shape of the bridge portion 120 of the mold 110. If the portion of the punch 150 corresponding to the bridge portion 120 has a flat shape instead of a protruding shape, the space of the central portion 121 may be insufficient compared to the two end portions 122 of the bridge portion 120. Therefore, when the punch 150 is provided in a protruding shape such as a U-shape, the height difference may be compensated.

[0062] Figure 4 (b) shows Figure 4 (a) shows a cross section of the punch protrusion 151. The cross section of the punch protrusion 151 may have a shape corresponding to the cross section of the bridge portion 120 of the die 110. That is, the cross-sectional shape of the punch protrusion 151 may be formed in a shape that is the same as a part or all of a U-shape, and may be formed in a shape that is the same as a part or all of a circle or an ellipse.

[0063] When the bag is formed using the above-mentioned apparatus 100 for forming a secondary battery bag, it is possible to manufacture Figure 5 A secondary battery pouch 130 is shown.

[0064] Reference Figure 5 The secondary battery pouch 130 manufactured by the apparatus 100 for manufacturing a secondary battery pouch according to Embodiment 1 of the present invention may include a pouch cup portion 133 and a pouch bridge portion 140 .

[0065] Here, the bag cup portion 133 may include two cup portions such as a left cup portion 131 and a right cup portion 132. The bag cup portion 133 may be configured to be provided with two cup portions such as a left cup portion 131 and a right cup portion 132. The bag bridge portion 140 may be configured to connect the two cup portions to each other between the left cup portion 131 and the right cup portion 132.

[0066] The portion formed by the left receiving groove 111 of the mold 110 may be the left cup portion 131, and the portion formed by the right receiving groove 112 may be the right cup portion 132. In addition, the portion formed by the bridge portion 120 of the mold 110 may be the bag bridge portion 140.

[0067] Therefore, in the secondary battery pouch 130 manufactured by the apparatus 100 for molding a secondary battery pouch according to embodiment 1 of the present invention, the pouch bridge 140 may be formed in a concave shape such that the height of the central portion 141 in the length direction L′ is smaller than the height of each of the two end portions 142 .

[0068] Specifically, the height of the central portion 141 of the bag bridge portion may be 2 to 4 mm, and the height of each of the two ends 142 of the bag bridge portion may be 4 to 6 mm. Therefore, the bag bridge portion may have a shape in which each of the two ends 142 is higher and the height decreases toward the central portion 141.

[0069] In the bag bridge portion 140 , when the central portion 141 is formed in a concave shape so that the height is smaller than that of each of the two end portions 142 , the bag bridge portion 140 can be easily unfolded when the bag is folded.

[0070] Reference Figure 1 According to the related art, the bag bridge portion 140 is not well developed. Figure 1 As shown, the bag bridge portion 140 has a shape protruding in the inner direction I of the secondary battery, like a V-shape rotated 90 degrees in the counterclockwise direction. Figure 1As shown, interference may occur between the electrode assembly and the bag bridge 140 inside, and therefore, the electrode assembly may be damaged. In particular, there is a problem that the central portion 141 of the bag bridge 140 is not well unfolded. Each of the two end portions 142 of the bag bridge 140 may be formed with an outer corner, and therefore, the two end portions 142 may be well unfolded due to the strong tension applied during folding. On the other hand, the central portion 141 cannot be well unfolded due to the weak tension.

[0071] However, in the secondary battery bag 130 manufactured by the apparatus 100 for molding a secondary battery bag according to the present invention, the width of the bag bridge portion 140 is formed to be relatively short at the central portion 141 of the bag bridge portion 140. That is, each of the two end portions 142 of the bag bridge portion 140 formed by the higher height portion of the bridge portion 120 of the mold 110 can be formed to have a longer width and length, and the central portion 141 of the bag bridge portion 140 molded by the lower height portion of the bridge portion 120 of the mold 110 can be formed to have a shorter width. Therefore, even if a small amount of tension is applied during folding, the central portion 141 of the bag bridge portion 140 can be better unfolded.

[0072] Therefore, when the bag is folded, the bag bridge 140 of the secondary battery bag 130 manufactured by the apparatus 100 for molding a secondary battery bag according to embodiment 1 of the present invention can be significantly better unfolded. In this case, the bag bridge 140 can be more than the outer direction E. Figure 1 As shown, the electrode assembly moves further and then unfolds in a straight line. In this case, no interference with the electrode assembly occurs, so the electrode assembly can be prevented from being damaged.

[0073] In addition to preventing damage to the electrode assembly and thus the battery, the apparatus for molding a secondary battery pouch according to Embodiment 1 of the present invention can achieve the effects of improving positioning accuracy of battery cells and preventing wrinkles on a sealing area of ​​the battery cells.

[0074] When the bag bridge 140 is well spread, the appearance of the battery cell can be accurately formed, and therefore, the position can be accurately measured by a visual camera, etc. This can improve positioning accuracy. In addition, if the bag bridge 140 is well spread, the problem of wrinkles when sealing the periphery of the bag can be prevented due to improved accuracy.

[0075] Therefore, the apparatus for molding a secondary battery pouch and a secondary battery according to Embodiment 1 of the present invention can realize a secondary battery having excellent quality.

[0076] Implementation Method 2

[0077] Figure 6 is a perspective view illustrating a mold of an apparatus for molding a secondary battery pouch according to Embodiment 2 of the present invention. Figure 7 is Figure 6 Cross-sectional view taken at the S1 position. Figure 8 is Figure 6 Cross-sectional views taken at positions S2 and S3. Fig. 9 is a perspective view illustrating a secondary battery pouch manufactured by the apparatus for molding a secondary battery pouch according to Embodiment 2 of the present invention. Fig.10 is Fig. 9 Cross-sectional view taken at position P1. Fig.11 is Fig. 9 Cross-sectional views taken at positions P2 and P3.

[0078] Embodiment 2 of the present invention is different from Embodiment 1 in that it is characterized in that a portion of the bottom surface of each of the left and right receiving grooves of the mold has an inclined shape.

[0079] The contents repeated with Embodiment 1 will be omitted as much as possible, and Embodiment 2 will focus on describing the differences. That is, it is obvious that the contents not described in Embodiment 2 can be regarded as the contents of Embodiment 1 when necessary.

[0080] The apparatus 200 for molding a secondary battery pouch according to Embodiment 2 of the present invention may include a die 210 and a punch.

[0081] The mold 210 may be configured to have a receiving groove for forming a cup portion of the bag on a base surface 213 on which the bag is placed.

[0082] Specifically, the mold 210 includes a left receiving groove 211 having a concave shape, a right receiving groove 212 formed in a side portion of the left receiving groove 211 and having a concave shape, and a bridging portion 220 between the left receiving groove 211 and the right receiving groove 212 to connect the left receiving groove 211 to the right receiving groove 212.

[0083] The punch 150 may be configured to form a cup portion of the bag while being inserted into the receiving groove of the die 210. The punch may have a shape corresponding to the concave groove of the die 210, and the punch may form the bag by being inserted into the concave groove of the die 210. The bag formed in this manner may have a shape corresponding to the cup portion of the bag. Figures 9 to 11 The secondary battery pouch 230 shown has the same shape.

[0084] Reference Figure 6In the apparatus 200 for molding a secondary battery bag according to embodiment 2 of the present invention, the bottom surfaces of the left accommodating groove 211 and the right accommodating groove 212 may be horizontally formed at the central region 214, and may be obliquely formed at the two end regions 215, with the direction parallel to the length direction L of the bridging portion 220 as a reference.

[0085] Figure 7 is Figure 6 The cross-sectional view taken at the S1 position may refer to a cross-sectional view on the central area 214. Figure 7 As shown in the cross-sectional view of , the bottom surface of the receiving groove at the central area 214 is not formed inclined, that is, it is formed horizontally.

[0086] Figure 8 is Figure 6 The cross-sectional views taken at the S2 and S3 positions of the embodiment of the present invention can refer to the cross-sectional views taken at the two end regions 215. Figure 8 As shown in the cross-sectional view of , the bottom surface of the receiving groove at each of the two end regions 215 may be inclined. In the apparatus 200 for molding a secondary battery bag according to embodiment 2 of the present invention, the cross-sections of the receiving grooves at positions S2 and S3 may be the same, and the cross-sectional view may be Figure 8 Cross-sectional view shown.

[0087] Reference Figure 8 In both end regions 215, the bottom surface 211-1 of the left receiving groove and the bottom surface 212-1 of the right receiving groove may be formed to be inclined to increase in height as approaching the bridge portion 220. Specifically, in both end regions 215, the inclination angle θ formed by the bottom surface 211-1 of the left receiving groove and the bottom surface 212-1 of the right receiving groove relative to the horizontal plane is 1 to 10 degrees.

[0088] In the apparatus 200 for molding a secondary battery bag according to Embodiment 2 of the present invention, each of the left and right receiving grooves 211 and 212 may include a bottom surface and a side wall surface 211-2 extending upward from the outer circumference of the bottom surface. A shape in which the bottom surface and the side wall surface are concave together may be realized.

[0089] In addition, the side wall surface 211 - 2 of the left receiving groove 211 measured with respect to the bottom surface 211 - 1 of the left receiving groove may have the same height at the central region 214 and both end regions 215 . This is described in detail as follows.

[0090] First, refer to Figure 7, the height of the side wall surface 211-2 of the left receiving groove 211 at the central area 214 measured with the bottom surface 211-1 of the left receiving groove as a reference may be t1. Figure 8 The height of the side wall surface 211-2 of the left receiving groove 211 measured with reference to the bottom surface 211-1 of the left receiving groove at each of the two end regions 215 may be t2. Here, t1 and t2 may have the same value (t1=t2).

[0091] In addition, in the apparatus 200 for molding a secondary battery bag according to Embodiment 2 of the present invention, the side wall surface 211-2 of the right receiving groove 212 measured with the bottom surface 212-1 of the right receiving groove as a reference may have the same height at the central area and both end areas 215. This is described in detail as follows.

[0092] First, refer to Figure 7 , the height of the side wall of the right receiving groove 212 at the central area 214 measured with reference to the bottom surface 212-1 of the right receiving groove may be t3. Figure 8 The height of the side wall of the right receiving groove 212 at each of the two end regions 215 measured with reference to the bottom surface 212-1 of the right receiving groove may be t4. Here, t3 and t4 may have the same value (t3=t4).

[0093] In addition, in the apparatus 200 for molding a secondary battery bag according to Embodiment 2 of the present invention, the left receiving groove 211 and the right receiving groove 212 may be formed in shapes symmetrical to each other with respect to the bridge portion 220. Specifically, symmetrical with respect to the bridge portion 220 means that the left receiving groove 211 and the right receiving groove 212 have shapes symmetrical with respect to a virtual plane perpendicularly cutting the bridge portion 220.

[0094] In this case, t1 = t3 and t2 = t4. In addition, according to the previous description, t1 = t2 and t3 = t4, therefore, t1 = t2 = t3 = t4. That is, t1, t2, t3 and t4 may have the same value.

[0095] When the bag is formed using the above-mentioned apparatus 200 for forming a secondary battery bag, it is possible to manufacture Figures 9 to 11 A secondary battery pouch 230 is shown.

[0096] Reference Fig. 9 The secondary battery pouch 230 manufactured by the apparatus 200 for manufacturing a secondary battery pouch according to Embodiment 2 of the present invention may include a pouch cup portion 233 and a pouch bridge portion 240 .

[0097] Here, the bag cup portion 233 may include two cup portions such as a left cup portion 231 and a right cup portion 232. The bag cup portion 233 may be configured to be provided with two cup portions such as a left cup portion 231 and a right cup portion 232. The bag bridge portion 240 may be configured to connect the two cup portions to each other between the left cup portion 231 and the right cup portion 232.

[0098] The portion formed by the left receiving groove 211 of the mold 210 may be the left cup portion 231, and the portion formed by the right receiving groove 212 may be the right cup portion 232. In addition, the portion formed by the bridge portion 220 of the mold 210 may be the bag bridge portion 240.

[0099] Reference Figures 9 to 11 , with the direction parallel to the length direction L' of the bag bridge portion 240 as a reference, the left cup portion 231 and the right cup portion 232 may have a horizontal bottom surface at the central region 234, and have an inclined bottom surface at both end regions 235. This may be a result of the shape of the bag cup portion 233 being formed to correspond to the shape of the receiving groove of the mold 210.

[0100] Fig.10 is Fig. 9 The cross-sectional view taken at the P1 position may refer to a cross-sectional view on the central area 234. Fig.10 As shown in the cross-sectional view of , the bottom surface of the receiving groove at the central area 234 is not formed inclined, that is, it is formed horizontally.

[0101] Fig.11 is Fig. 9 The cross-sectional views taken at the P2 and P3 positions of the embodiment of the present invention can refer to the cross-sectional views taken at the P2 and P3 positions of the embodiment of the present invention. The cross-sectional views taken at the P2 and P3 positions can refer to the cross-sectional views on the two end regions 235. Fig.11 As shown in the cross-sectional view of , the bottom surface of the receiving groove at each of the two end regions 235 may be inclined. In the secondary battery bag 230 manufactured by the apparatus 200 for molding a secondary battery bag according to embodiment 2 of the present invention, the cross-sections of the receiving groove at positions P2 and P3 may be the same, and the cross-sectional view may be Fig.11 Cross-sectional view shown.

[0102] Reference Fig.11 , in both end regions 235, the bottom surface 231-1 of the left cup portion 231 and the bottom surface 232-1 of the right cup portion 232 may be formed to be inclined to increase in height as approaching the bag bridging portion 240. Specifically, in both end regions 235, the inclination angle θ formed by the bottom surface 231-1 of the left cup portion 231 and the bottom surface 232-1 of the right cup portion 232 relative to the horizontal plane is 1 to 10 degrees.

[0103] In the secondary battery pouch 230 manufactured by the apparatus 200 for molding a secondary battery pouch according to Embodiment 2 of the present invention, each of the left cup portion 231 and the right cup portion 232 may include a bottom surface and a side wall surface 231-2 extending upward from the outer circumference of the bottom surface. A shape in which the bottom surface and the side wall surface are concave together may be realized.

[0104] In addition, the side wall surface 231 - 2 of the left cup portion 231 measured with reference to the bottom surface 231 - 1 of the left cup portion 231 may have the same height at the central region 234 and both end regions 235 . This is described in detail below.

[0105] First, refer to Fig.10 , the height of the side wall surface 231-2 of the left cup portion 231 at the central area 234 measured with reference to the bottom surface 231-1 of the left cup portion 231 may be y1. Fig.11 The height of the side wall surface 231-2 of the left cup portion 231 at each of the two end regions 235 measured with reference to the bottom surface 231-1 of the left cup portion 231 may be y2. Here, y1 and y2 may have the same value (y1=y2).

[0106] In addition, in the secondary battery pouch 230 manufactured by the apparatus 200 for molding a secondary battery pouch according to Embodiment 2 of the present invention, the side wall surface of the right cup portion 232 measured with the bottom surface 232-1 of the right cup portion 232 as a reference may have the same height at the central region 234 and both end regions 235. This is described in detail as follows.

[0107] First, refer to Fig.10 , the height of the side wall of the right cup portion 232 at the central area 234 measured with reference to the bottom surface 232-1 of the right cup portion 232 may be y3. Fig.11 , the height of the side wall of the right cup portion 232 at each of the two end regions 235 measured with reference to the bottom surface 232-1 of the right cup portion 232 may be t4. Here, y3 and y4 may have the same value (y3=y4).

[0108] Furthermore, in the secondary battery pouch 230 manufactured by the apparatus 200 for molding a secondary battery pouch according to Embodiment 2 of the present invention, the left cup portion 231 and the right cup portion 232 may be formed in shapes symmetrical to each other with respect to the pouch bridging portion 240. Specifically, symmetrical with respect to the pouch bridging portion 240 means that the left cup portion 231 and the right cup portion 232 have shapes symmetrical with respect to a virtual plane perpendicularly cutting the pouch bridging portion 240.

[0109] In this case, y1 = y3 and y2 = y4. Furthermore, according to the previous description, y1 = y2 and y3 = y4, therefore, y1 = y2 = y3 = y4. That is, y1, y2, y3, and y4 may have the same value.

[0110] Since it is manufactured by the secondary battery pouch molding apparatus 200 according to the second embodiment of the present invention, in the secondary battery pouch 230 of the present invention, each of the left cup portion 231 and the right cup portion 232 may have a horizontal bottom surface at the central region 234 and an inclined bottom surface at both end regions 235. Therefore, when the pouch is folded, the pouch bridge portion 240 may be significantly better unfolded.

[0111] Since the secondary battery pouch 230 of the present invention has an inclined bottom surface at each of the two end regions 235, when the pouch is folded in half so that the edge of the left cup portion 231 and the edge of the right cup portion 232 contact each other, a portion of the bottom surface of each of the two end regions 235 moves more. As a result, the edge portion of each of the two end regions 235 can pull the central region 234 of the pouch more. As a result, the pouch bridge portion 240 can be significantly better spread out on the central region 234.

[0112] When the bag bridge 240 is significantly better expanded, the bag bridge 240 can be more expanded in the outward direction E than in the bag bridge 240. Figure 1 As shown, the electrode assembly moves further and then unfolds in a straight line. In this case, no interference with the electrode assembly occurs, so the electrode assembly can be prevented from being damaged.

[0113] In addition to preventing damage to the electrode assembly and thus the battery cell, the apparatus 200 for molding a secondary battery pouch according to Embodiment 2 of the present invention can achieve the effects of improving positioning accuracy of the battery cell and preventing wrinkles on a sealing area of ​​the battery cell.

[0114] When the bag bridge 240 is well spread, the appearance of the battery cell can be accurately formed, and therefore, the position can be accurately measured by a visual camera or the like. This can improve positioning accuracy. In addition, if the bag bridge 240 is well spread, the problem of wrinkles when sealing the periphery of the bag can be prevented due to improved accuracy.

[0115] Therefore, the apparatus 200 for molding a secondary battery pouch and a secondary battery according to Embodiment 2 of the present invention can realize a secondary battery having excellent quality.

[0116] Implementation 3

[0117] Fig.12 is a perspective view illustrating a mold of an apparatus for molding a secondary battery pouch according to Embodiment 3 of the present invention.

[0118] Embodiment 3 of the present invention is different from Embodiments 1 and 2 in that an apparatus for molding a secondary battery pouch has the features of Embodiments 1 and 2 described above, and a secondary battery pouch is manufactured by the apparatus.

[0119] The contents repeated with Embodiments 1 and 2 will be omitted as much as possible, and Embodiment 3 will focus on describing the differences. That is, it is obvious that the contents not described in Embodiment 3 can be regarded as the contents of Embodiments 1 and 2 when necessary.

[0120] The apparatus 300 for molding a secondary battery pouch according to Embodiment 3 of the present invention may include a die 310 and a punch.

[0121] The mold 310 may be configured to have a receiving groove for forming a cup portion of the bag on a base surface 313 on which the bag is placed.

[0122] Specifically, the mold 310 includes a left accommodating groove 311 having a concave shape, a right accommodating groove 312 formed in a side portion of the left accommodating groove 311 and having a concave shape, and a bridging portion 320 between the left accommodating groove 311 and the right accommodating groove 312 to connect the left accommodating groove 311 to the right accommodating groove 312 .

[0123] The punch 150 may be configured to form a cup portion of the bag while being inserted into the receiving groove of the die 310. The punch may have a shape corresponding to the concave groove of the die 310, and the punch may form the bag by being inserted into the concave groove of the die 310.

[0124] Reference Fig.12 In the apparatus 300 for molding a secondary battery bag according to Embodiment 3 of the present invention, the bridge portion 320 may have a concave shape so that the height of the central portion 321 of the bridge portion 120 in the length direction L is less than the height of each of the two end portions 322. Here, the height of the bridge portion 320 may be continuously reduced from the two end portions 322 to the central portion 321.

[0125] along Fig.12 The cross section of the bridge portion 320 taken along the line G-G' shown may have the same Figure 3 Therefore, in the description of the aforementioned embodiment 1, based on Figure 3 The described contents may be equally applied to the apparatus 300 for molding a secondary battery pouch according to Embodiment 3.

[0126] The cross section of the bridge portion 320 may be formed in a shape that is the same as part or all of a U-shape, or may be formed in a shape that is the same as part or all of a circle or an ellipse. In addition, the height h1 of the central portion 321 of the bridge portion 320 may be 9 mm to 10 mm, and the height h2 of each of the two end portions 322 of the bridge portion 320 may be 11 mm to 12 mm.

[0127] In addition, refer to Fig.12 In the apparatus 300 for molding a secondary battery bag according to embodiment 3 of the present invention, the bottom surfaces of the left accommodating groove 311 and the right accommodating groove 312 may be horizontally formed at the central region 314, and may be obliquely formed at the two end regions 315, with the direction parallel to the length direction L of the bridging portion 320 as a reference.

[0128] Fig.12 The cross section of the bottom surface of the receiving groove cut through R1 shown in FIG. Figure 7 and the cross section of the bottom surface of the receiving groove cut through R2 and R3 may be the same as shown in Figure 8 Therefore, in the description of the above embodiment 2, based on Figure 7 and Figure 8 The described contents may be equally applied to the secondary battery pouch molding apparatus 300 according to Embodiment 3.

[0129] In the two end areas 315, as approaching the bridging portion 320, the bottom surfaces of the left accommodating groove 311 and the right accommodating groove 312 can be formed inclined so that the height increases, and the inclination angle θ formed by the bottom surfaces of the left accommodating groove 311 and the right accommodating groove 312 relative to the horizontal plane is 1 degree to 10 degrees.

[0130] Each of the left accommodating groove 311 and the right accommodating groove may include a bottom surface and a side wall surface extending upward from the periphery of the bottom surface, and the side wall surface of the left accommodating groove 311 measured with the bottom surface of the left accommodating groove 311 as a reference may have the same height in the central area 314 and the two end areas 315.

[0131] In addition, the sidewall surface of the right receiving groove 312 measured with respect to the bottom surface of the right receiving groove 312 may have the same height at the central area 314 and both end areas 315. In addition, the left receiving groove 311 and the right receiving groove 312 may be formed in a symmetrical shape with respect to the bridge portion 320.

[0132] The secondary battery pouch manufactured by the apparatus 300 for molding a secondary battery pouch according to Embodiment 3 of the present invention may also have the characteristics of the secondary battery pouches manufactured in Embodiments 1 and 2.

[0133] A secondary battery pouch (not shown) manufactured by the apparatus 300 for manufacturing a secondary battery pouch according to Embodiment 3 of the present invention may include a pouch cup portion and a pouch bridge portion.

[0134] In addition, the bag bridging portion can be formed into a concave shape so that the height of the central portion in the length direction is less than the height of each of the two end portions, and with the direction parallel to the length direction of the bag bridging portion as a reference, the bottom surfaces of the left cup portion and the right cup portion can be horizontally formed at the central area, and the bottom surfaces of the left cup portion and the right cup portion can be obliquely formed at each of the two end areas.

[0135] In addition, since the secondary battery bag manufactured by the apparatus 300 for molding a secondary battery bag according to Embodiment 3 of the present invention has the characteristics of the secondary battery bags manufactured in Embodiments 1 and 2, based on Figure 5 The features of the secondary battery pack described in Embodiment 1 and the Figures 9 to 11 The features of the secondary battery pouch described in Embodiment 2 may also be directly applied to the apparatus 300 for molding a secondary battery pouch according to Embodiment 3.

[0136] Therefore, in the apparatus for molding a secondary battery bag according to embodiment 3 and the secondary battery bag manufactured by the apparatus, when the bag is folded, the bag bridging portion can be well unfolded to prevent damage to the battery cell, improve the positioning accuracy of the battery cell, and prevent wrinkles on the sealing portion of the battery cell, thereby producing a secondary battery with excellent quality.

[0137] While embodiments of the present invention have been described with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims.

[0138] [Description of symbols]

[0139] 100, 200, 300: Equipment for forming secondary battery bags

[0140] 110, 210, 310: Mould

[0141] 111, 211, 311: Left storage slot

[0142] 211-1: Bottom surface of left receiving groove

[0143] 211-2: Side wall surface

[0144] 112, 212, 312: Right receiving slot

[0145] 212-1: Bottom surface of right receiving groove

[0146] 113, 213, 313: base surface

[0147] 214, 314: Central area

[0148] 215, 315: Two end areas

[0149] 120, 220, 320: Bridge

[0150] 212, 321: Central part

[0151] 122, 322: two ends

[0152] 130, 230: Secondary battery bag

[0153] 131, 231: Left cup

[0154] 231-1: Bottom surface of left cup

[0155] 231-2: Side wall surface

[0156] 232-1: Bottom surface of right cup

[0157] 132, 232: right cup

[0158] 133, 233: Bag and cup department

[0159] 234: Central area of ​​the bag

[0160] 235: Both end areas of the bag

[0161] 140, 240: Bag bridging part

[0162] 141: Central part

[0163] 142: Both ends

[0164] 150: Punch

[0165] 151: Punch protrusion.

Claims

1. A device for forming a secondary battery bag, the device comprising: a mold in which a receiving groove for forming a cup portion of the bag is defined on a base surface on which the bag is placed; as well as a punch, the punch being inserted into the receiving groove of the die to form the cup portion of the bag, The mold comprises: a left receiving groove, the left receiving groove having a concave shape; a right receiving groove defined in one side portion of the left receiving groove and having a concave shape; and a bridging portion, the bridging portion being configured to connect the left accommodating groove to the right accommodating groove between the left accommodating groove and the right accommodating groove, The bridge portion has a concave shape such that a height of a central portion of the bridge portion in a length direction is smaller than a height of each of both end portions. 2 . The apparatus according to claim 1 , wherein the bridge portion has a height that decreases continuously from each of the two end portions to the central portion. 3 . The apparatus according to claim 1 , wherein a cross section of the bridge portion cut by a virtual vertical plane dividing the left and right receiving grooves while passing through the bridge portion has a shape similar to a part or all of a U-shape. 4 . The apparatus according to claim 1 , wherein a cross section of the bridge portion cut by a virtual vertical plane dividing the left and right receiving grooves while passing through the bridge portion has a shape similar to a part or all of a circle or an ellipse. 5 . The apparatus according to claim 1 , wherein a central portion of the bridge portion has a height ( h1 ) of 9 mm to 10 mm, and each of both end portions of the bridge portion has a height ( h2 ) of 11 mm to 12 mm. 6 . The apparatus according to claim 1 , wherein the punch includes a punch protrusion having a shape protruding to correspond to a concave shape of the bridge portion.

7. A device for forming a secondary battery bag, the device comprising: a mold in which a receiving groove for forming a cup portion of the bag is defined on a base surface on which the bag is placed; as well as a punch, the punch being inserted into the receiving groove of the die to form the cup portion of the bag, The mold comprises: a left receiving groove, the left receiving groove having a concave shape; a right receiving groove defined in one side portion of the left receiving groove and having a concave shape; and a bridging portion, the bridging portion being configured to connect the left accommodating groove to the right accommodating groove between the left accommodating groove and the right accommodating groove, Wherein, with reference to a direction parallel to the length direction of the bridge portion, each of the left accommodating groove and the right accommodating groove has a horizontal bottom surface at a central area, and has an inclined bottom surface at each of two end areas.

8. The device according to claim 7, wherein: In the both end regions, a bottom surface of each of the left and right receiving grooves is inclined such that a height of the bottom surface increases as approaching the bridge portion. 9 . The apparatus according to claim 7 , wherein an inclination angle (θ) formed by bottom surfaces of the left and right receiving grooves relative to a horizontal plane is 1 to 10 degrees.

10. The apparatus according to claim 7, wherein each of the left receiving groove and the right receiving groove comprises a bottom surface and a side wall surface extending upward from an outer circumference of the bottom surface, and The side wall surface of the left receiving groove measured with reference to the bottom surface of the left receiving groove has the same height (t1=t2) at the central area and the both end areas. 11 . The apparatus according to claim 10 , wherein a side wall surface of the right receiving groove measured with reference to a bottom surface of the right receiving groove has the same height ( t3 = t4 ) at the central region and the two end regions.

12. The apparatus according to any one of claims 7 to 11, wherein the left receiving groove and the right receiving groove are defined in shapes symmetrical to each other with respect to the bridge portion.

13. A device for forming a secondary battery bag, the device comprising: a mold in which a receiving groove for forming a cup portion of the bag is defined on a base surface on which the bag is placed; as well as a punch, the punch being inserted into the receiving groove of the die to form the cup portion of the bag, The mold comprises: a left receiving groove, the left receiving groove having a concave shape; a right receiving groove defined in one side portion of the left receiving groove and having a concave shape; and a bridging portion, the bridging portion being configured to connect the left accommodating groove to the right accommodating groove between the left accommodating groove and the right accommodating groove, wherein the bridge portion has a concave shape such that a height of a central portion in a length direction is smaller than a height of each of both end portions, and Each of the left and right receiving grooves has a horizontal bottom surface at a central region and has an inclined bottom surface at each of both end regions with reference to a direction parallel to the length direction of the bridge portion.

14. A secondary battery bag, comprising: A bag cup portion, the bag cup portion comprising two cup portions, a left cup portion and a right cup portion; as well as a bag bridge portion, the bag bridge portion being configured to connect the two cup portions to each other between the left cup portion and the right cup portion, The bag bridging portion has a concave shape such that a height of a central portion in a length direction (L') is smaller than a height of each of both end portions. 15 . The secondary battery pouch of claim 14 , wherein the central portion of the pouch bridging portion has a height of 2 mm to 4 mm, and each of the two end portions of the pouch bridging portion has a height of 4 mm to 6 mm.

16. A secondary battery bag comprising: A bag cup portion, the bag cup portion comprising two cup portions, a left cup portion and a right cup portion; as well as a bag bridge portion, the bag bridge portion being configured to connect the two cup portions to each other between the left cup portion and the right cup portion, Each of the left cup portion and the right cup portion has a horizontal bottom surface at a central region and an inclined bottom surface at each of two end regions, with reference to a direction parallel to the length direction of the bridge portion.

17. A secondary battery bag, comprising: A bag cup portion, the bag cup portion comprising two cup portions, a left cup portion and a right cup portion; as well as a bag bridge portion, the bag bridge portion being configured to connect the two cup portions to each other between the left cup portion and the right cup portion, wherein the bag bridging portion has a concave shape such that the height of the central portion in the length direction is smaller than the height of each of the two end portions, and Each of the left and right cup portions has a horizontal bottom surface at a central region and has an inclined bottom surface at each of both end regions with reference to a direction parallel to the length direction of the bridge portion.

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