Battery case molding apparatus and battery case

Abstract

The present invention provides a battery case forming apparatus (10) including a die (100) including a forming hole (110) and a first fixing portion (120), a stripper (200) including a punch hole (210) and a second fixing portion (220) vertically facing the first fixing portion (120), and a punch (300) passing through the punch hole (210) and inserted into the forming hole (110). The first fixing portion (120) can include one or more first protrusion portions (122) and one or more first hole portions (124) alternately formed. The second fixing portion (220) can include one or more second protrusion portions (222) and one or more second hole portions (224), the one or more second protrusion portions (222) can be respectively inserted into the one or more first hole portions (124), and the one or more first protrusion portions (122) can be respectively inserted into the one or more second hole portions (224).

Description

Technical Field

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2024-0043578 filed on March 29, 2024 and Korean Patent Application No. 10-2025-0039798 filed on March 27, 2025, the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to battery casing forming equipment and battery casing, and more particularly, to battery casing forming equipment and battery casing that mitigates the problem of membrane curling due to pressure fixation during the cup forming of the battery casing, even when the membrane is pressed and fixed. Background Technology

[0003] Figure 1 The pouch-type secondary battery 50 may include an electrode assembly 52 and a battery housing 54 that houses the electrode assembly 52. ​​The battery housing 54 can be used... Figures 2 to 4 The battery casing forming equipment 10 presses and forms a sheet-like film F to form a cup portion P1 that accommodates the electrode assembly 52, and then processes (e.g., cuts) the formed film to manufacture it.

[0004] To prevent the edge portion P2 of the membrane F from being pulled towards the cup portion P1 during the forming process, the battery casing forming apparatus 10 may be provided with a first fixing part 120 and a second fixing part 220, which press and fix a predetermined portion R of the membrane F to the outside of the cup portion P1. Figures 2 to 4 The predetermined portion R can be positioned at the edge portion P2 of the membrane F between the first fixing portion 120 and the second fixing portion 220, and can be pressed and formed by the first fixing portion 120 and the second fixing portion 220.

[0005] However, the curling of membrane F may be deteriorated due to pressure on the predetermined portion R. Figure 5 When curling deteriorates, delivery (e.g., adsorption delivery) defects, alignment defects, or processing defects may occur in the membrane F or the individual battery housing 54. Therefore, a method to mitigate membrane F curling is needed.

[0006] The relevant prior art document is Korean Patent Application Publication No. 10-2022-0057406. Summary of the Invention

[0007] Technical issues

[0008] To address the aforementioned problems, the present invention aims to provide a battery casing forming apparatus that, during the cup-shaped forming of the battery casing, mitigates the problem of film curling and deterioration caused by the first and second fixing portions, even when the first and second fixing portions press and fix the film.

[0009] The purpose of this invention is to provide a battery casing forming apparatus that prevents conveying defects, alignment defects, and processing defects of the film or individual battery casing.

[0010] The purpose of this invention is to provide a battery casing forming apparatus, wherein the edge portion of the membrane has bend resistance.

[0011] The purpose of this invention is to provide a battery casing forming apparatus that facilitates the transport, alignment, and processing of membranes or individual battery casings.

[0012] The purpose of this invention is to provide a battery casing forming apparatus in which electrolyte is easily and stably injected into a cup portion due to the unevenness provided in the membrane or individual battery casing.

[0013] The purpose of this invention is to provide a battery casing forming apparatus that prevents forming defects and improves quality.

[0014] The purpose of this invention is to provide a battery casing forming apparatus in which a film is stably pressed and fixed.

[0015] The purpose of this invention is to provide a battery casing forming apparatus that prevents deformation and damage to the membrane caused by a first fixing part and a second fixing part.

[0016] The object of the present invention is to provide a battery casing forming apparatus that uniformly and effectively reduces curling caused by the first fixing part and the second fixing part.

[0017] The object of the present invention is to provide a battery casing forming apparatus that effectively reduces curling at the edge of the film during cup forming.

[0018] The purpose of this invention is to provide a battery casing forming apparatus in which electrolyte is easily and stably injected into the cup portion P1.

[0019] The object of the present invention is to provide a battery housing that alleviates the curling problem caused by a predetermined portion.

[0020] The object of the present invention is to provide a battery housing that prevents defects in transport, alignment, processing or sealing.

[0021] The purpose of this invention is to provide a battery housing that allows for easy and stable injection of electrolyte.

[0022] The purpose of this invention is to provide a battery housing that effectively reduces curling even when the cup portion is long.

[0023] The purpose of this invention is to provide a battery housing that prevents forming defects and improves quality.

[0024] The technical problem to be solved by the present invention is not limited to the above-described objectives, and other objectives and advantages of the invention not described herein may be understood from the following description and will be more clearly understood through examples of the invention. Furthermore, it will be apparent that the objectives and advantages of the invention may be implemented by the means indicated in the claims and combinations thereof.

[0025] Technical solution

[0026] To address the aforementioned problems, the present invention provides a battery casing forming apparatus 10, which includes: a mold 100; a demolding device 200; and a punch 300.

[0027] The mold 100 may include: a forming hole 110; and a first fixing part 120.

[0028] The forming hole 110 may be formed in the upper surface of the mold 100, and the forming hole 110 may be recessed downward or formed to extend downward through.

[0029] The first fixing part 120 may be formed on the upper surface.

[0030] The demolding device 200 may include: a punch hole 210; and a second fixing part 220.

[0031] The punch hole 210 can be formed at a position corresponding to the forming hole 110.

[0032] The punch hole 210 can be formed to extend vertically through the demolding device 200.

[0033] The second fixing part 220 may be formed on the lower surface of the demolding device 200.

[0034] The second fixing part 220 can face the first fixing part 120 perpendicularly.

[0035] Punch 300 can pass through punch hole 210.

[0036] The punch 300 can be inserted into the forming hole 110.

[0037] The first fixing part 120 may include one or more first protrusions 122 and one or more first holes 124.

[0038] One or more first protrusions 122 and one or more first holes may be formed alternately.

[0039] The second fixing part 220 may include: one or more second protrusions 222; and one or more second holes 224.

[0040] One or more second protrusions 222 can be inserted into one or more first holes 124 respectively.

[0041] One or more first protrusions 122 can be inserted into one or more second holes 224 respectively.

[0042] In one embodiment, the first fixing portion 120 may be formed to extend along the edge S of the forming hole 110 or to extend obliquely to the edge S.

[0043] The second fixing part 220 can be formed along the first fixing part 120.

[0044] In one embodiment, the first fixing part 120 may be formed to extend along the edge S.

[0045] In one embodiment, one or more first protrusions 122 and one or more first holes 124 may be alternately formed along the extension direction of the first fixing portion 120.

[0046] In one embodiment, each of one or more first protrusions 122, each of one or more first holes 124, each of one or more second protrusions 222, and each of one or more second holes 224 may be configured to extend along the extension direction of the first fixing portion 120.

[0047] In one embodiment, the lengths of one or more first protrusions 122 may be equal to each other.

[0048] The lengths of one or more second protrusions 222 may be equal to each other.

[0049] In one embodiment, the total length of one or more second protrusions 222 may be greater than the total length of one or more first protrusions 122.

[0050] In one embodiment, the end of each of the first protrusions 122 and the end of the inner surface of each of the first holes 124 adjacent to each of the first protrusions 122 can be in direct contact with and connected to each other.

[0051] The ends of each of the second protrusions 222 and the ends of the inner surfaces of each of the second holes 224 adjacent to each of the second protrusions 222 can directly contact and connect with each other.

[0052] In one embodiment, in the extending direction of the first fixing part 120, the section in which the first fixing part 120 is formed can completely include the section in which the edge S is formed.

[0053] In one embodiment, the forming hole 110 may include a long side S1 and a short side S2 that is shorter than the long side S1.

[0054] Side S can be the longer side S1.

[0055] In one embodiment, the forming hole 110 includes: a pair of long sides S1 arranged on one side and the opposite side; and a pair of short sides S2 respectively connecting the two ends of the pair of long sides S1.

[0056] The mold 100 may include a pair of first fixing parts 120.

[0057] A pair of first fixing parts 120 may be formed on one side and the opposite side of a pair of long sides S1 respectively, and the pair of long sides S1 are inserted between the pair of first fixing parts 120.

[0058] A pair of first fixing parts 120 can correspond to the long side S1 arranged on one side and the long side S1 arranged on the opposite side.

[0059] A pair of first fixing parts 120 may be formed to extend along the corresponding long side S1 or to extend obliquely to the corresponding long side S1.

[0060] The demolding device 200 may include a pair of second fixing parts 220.

[0061] A pair of second fixing parts 220 can be formed along a pair of first fixing parts 120 respectively.

[0062] A pair of second fixing parts 220 can each face perpendicularly toward a pair of first fixing parts 120.

[0063] In one embodiment, the membrane F formed by the punch 300 at the upper part of the mold 100 when pressed and fixed by the demolding device 200 may have a bend line L1.

[0064] The bent line L1 can extend along the direction of the extension of side S, or in a direction inclined relative to the direction of the extension of side S.

[0065] The mold 100 may include a pair of first fixing parts 120.

[0066] A pair of first fixing parts 120 can be formed symmetrically with respect to the bend line L1.

[0067] The demolding device 200 may include a pair of second fixing parts 220.

[0068] A pair of second fixing parts 220 can be formed along a pair of first fixing parts 120 respectively.

[0069] A pair of second fixing parts 220 can each face perpendicularly toward a pair of first fixing parts 120.

[0070] In one embodiment, the number of one or more first protrusions 122 may be one more or one less than the number of one or more second protrusions 222.

[0071] In one embodiment, the number of second protrusions 222 may be greater than the number of first protrusions 122.

[0072] In one embodiment, the number of one or more first protrusions 122 may be 1 and the number of one or more second protrusions 222 may be 2, or the number of one or more first protrusions 122 may be 2 and the number of one or more second protrusions 222 may be 1.

[0073] In one embodiment, each of one or more first protrusions 122, each of one or more first holes 124, each of one or more second protrusions 222, and each of one or more second holes 224 may be formed to extend along edge S.

[0074] One or more first protrusions 122 may have the same length as each other, and one or more second protrusions 222 may have the same length as each other.

[0075] In one embodiment, the battery casing forming apparatus 10 may further include: a conveying unit; and a cutter.

[0076] The conveying unit can convey along the length direction the film F formed by the punch 300 at the upper part of the mold 100 when it is pressed and fixed by the demolding device 200.

[0077] The cutter can cut a portion of the membrane F along the width direction, which has a cup portion P1 formed by the punch 300.

[0078] The edge S can be one side or the opposite side of the forming hole 110 in the width direction.

[0079] The first fixing part 120 may be formed on the outside of the forming hole 110 in the width direction.

[0080] In addition, to solve the above problems, the present invention provides a battery housing comprising a cup portion P1 and an edge portion P2.

[0081] The cup portion P1 can protrude along the thickness direction.

[0082] The cup portion P1 may have an internal space to accommodate the electrode assembly 52.

[0083] The edge P2 can surround the cup P1.

[0084] The edge P2 can be sealed.

[0085] The edge portion P2 may have a predetermined portion R.

[0086] The predetermined portion R may include one or more first portions R1 and one or more second portions R2.

[0087] One or more first parts R1 and one or more second parts R2 may be formed alternately.

[0088] Each of one or more first portions R1 may be at least partially formed as a depression on one side facing the thickness direction.

[0089] Each of one or more second portions R2 may be formed to protrude further than the edge P2 outside the predetermined portion R in the opposite direction in the thickness direction.

[0090] In one embodiment, the predetermined portion R may be formed together with the cup portion P1.

[0091] In one embodiment, the predetermined portion R may be formed to extend along the cup portion P1 or to extend obliquely to the cup portion P1.

[0092] One or more first portions R1 and one or more second portions R2 may be formed alternately along the extension direction of the predetermined portion R.

[0093] Beneficial effects

[0094] According to an embodiment of the present invention, a battery casing forming apparatus may include: a mold 100, the mold 100 including a forming hole 110 and a first fixing portion 120, the forming hole 110 being formed in the upper surface of the mold 100, the forming hole 110 being recessed downward or formed to extend downward through, the first fixing portion 120 being formed on the upper surface; a demolding device 200, the demolding device 200 including a punch hole 210 and a second fixing portion 220, the punch hole 210 being formed at a position corresponding to the forming hole 110 and formed to extend vertically through, the second fixing portion 220 being formed on the lower surface of the demolding device 200 and perpendicularly facing the first fixing portion 120; and a punch 300, the punch 300 passing through the punch hole 210 and inserted into the forming hole 110. The first fixing portion 120 includes one or more first protrusions 122 and one or more first holes 124 alternately formed. The second fixing part 220 includes one or more second protrusions 222 that are respectively inserted into one or more first holes 124, and one or more second holes 224 for one or more first protrusions 122 to be respectively inserted into.

[0095] Therefore, during the forming of the cup portion P1, even if the predetermined portion R of the membrane F located between the first fixing portion 120 and the second fixing portion 220 is pressed and formed by the first fixing portion 120 and the second fixing portion 220, the problem of membrane F curling and deterioration caused by the predetermined portion R can be mitigated. Therefore, defects in the conveying (e.g., adsorption conveying), alignment, processing, or sealing of the membrane F or the individual battery housing 54 can be prevented.

[0096] Furthermore, due to the alternating arrangement of one or more first portions R1 and one or more second portions R2, the edge portion P2 of the membrane F can have bending resistance. Therefore, it can facilitate the transport, alignment, processing, or sealing of the membrane F or the individual battery housing 54.

[0097] Furthermore, the predetermined portion R can have unevenness in the thickness direction by alternately arranging one or more first portions R1 and one or more second portions R2. Therefore, when the predetermined portion R is covered by the film F, the unevenness can reliably and stably ensure the gap H extending across the predetermined portion R between the predetermined portion R and the film F. Figure 13 Electrolytes can be easily and stably injected into cup P1 through gap H.

[0098] According to an embodiment of the present invention, the first fixing portion 120 may be formed to extend along the edge S of the forming hole 110 or to extend obliquely to the edge S. The second fixing portion 220 may be formed along the first fixing portion 120.

[0099] Therefore, forming defects in the battery casing 54 can be prevented, and its quality can be improved. Furthermore, even if the edge S of the forming hole 110 is relatively long, curling can be effectively reduced.

[0100] According to an embodiment of the present invention, the first fixing part 120 may be formed to extend along the edge S.

[0101] Therefore, when the membrane F is stretched during the forming of the cup portion P1, the membrane F can be stably pressed and fixed by the first fixing portion 120 and the second fixing portion 220, and the stretching amount of the membrane F becomes uniform, thereby preventing forming defects of the battery casing 54 and improving its quality.

[0102] According to an embodiment of the present invention, one or more first protrusions 122 and one or more first holes 124 may be alternately formed along the extending direction of the first fixing portion 120.

[0103] Therefore, conventional battery casing forming equipment can be directly used simply by changing the first fixing part 120 and the second fixing part 220. Furthermore, since the position of the predetermined portion R of the film F formed by pressing and forming the first fixing part 120 and the second fixing part 220 is the same as in the prior art, conventional secondary battery manufacturing equipment can be directly used.

[0104] Furthermore, when the cup portion P1 is formed, the membrane F is stretched in the thickness direction (upward and downward) along the extending direction of the first fixing portion 120 at both ends of one or more first protrusions 122 and at both ends of one or more second protrusions 222, so that the membrane F can be firmly bonded and fixed to a total of 2 (n1+n2) protruding ends. Therefore, forming defects in the battery casing 54 can be prevented, and its quality can be improved.

[0105] Furthermore, even if the length of the side S of the forming hole 110 is relatively long, curling can be effectively reduced.

[0106] According to an embodiment of the present invention, each of one or more first protrusions 122, each of one or more first holes 124, each of one or more second protrusions 222, and each of one or more second holes 224 may be formed to extend along the extending direction of the first fixing portion 120.

[0107] Therefore, when the membrane F is stretched during the forming of the cup portion P1, the first fixing portion 120 and the second fixing portion 220 can stably press and fix the membrane F.

[0108] Furthermore, the number of first protrusions 122 and second protrusions 222, as well as the number of first holes 124 and second holes 224, can be reduced. As a result, since the total stretch of the membrane F in the thickness direction (upward and downward) along the extension direction of the first fixing portion 120 is reduced during the forming of the cup portion P1, the membrane F will not deform or be damaged even when the protrusions 122 and 222 and the holes 124 and 224 are alternately formed in the fixing portions 120 and 220.

[0109] According to an embodiment of the invention, one or more first protrusions 122 may have equal lengths. One or more second protrusions 222 may have equal lengths.

[0110] Therefore, curling in the membrane F or battery housing 54 can be uniformly generated and suppressed. As a result, curling generated in the membrane F or battery housing 54 by the first fixing part 120 and the second fixing part 220 can be uniformly and effectively reduced.

[0111] According to an embodiment of the present invention, the total length of one or more second protrusions 222 may be greater than the total length of one or more first protrusions 122.

[0112] Therefore, since the total length of one or more (e.g., n2) second portions R2 of the predetermined portions R is greater than the total length of one or more (e.g., n1) first portions R1, the degree of curling in one thickness direction (e.g., upward direction) of the membrane F or battery housing 54 can be increased. Thus, curling in the opposite thickness direction (e.g., downward direction) occurring at the edge portion P2 of the membrane F due to the forming of the cup portion P1 can be effectively mitigated.

[0113] According to an embodiment of the present invention, the end of each of the first protrusions 122 and the end of the inner surface of each of the first holes 124 adjacent to each of the first protrusions 122 can directly contact and connect with each other. The end of each of the second protrusions 222 and the end of the inner surface of each of the second holes 224 adjacent to each of the second protrusions 222 can directly contact and connect with each other.

[0114] Therefore, the section of membrane F that is pressed and fixed by the first fixing part 120 and the second fixing part 220 can be continuous in the extending direction of the first fixing part 120. Thus, since membrane F is continuously and stably pressed and fixed, forming defects in the battery casing 54 can be prevented, and its quality can be improved.

[0115] According to an embodiment of the present invention, in the extending direction of the first fixing part 120, the section in which the first fixing part 120 is formed can completely include the section in which the edge S is formed.

[0116] Therefore, forming defects in the battery casing 54 can be prevented, and its quality can be improved.

[0117] According to an embodiment of the present invention, the forming hole 110 may include a long side S1 and a short side S2 shorter than the long side S1. Side S may be the long side S1.

[0118] Therefore, when the membrane F is stretched during the forming of the cup portion P1, the portion of the membrane F located outside the long side S1 of the forming hole 110 can be effectively prevented from being pulled inward through the first fixing portion 120 and the second fixing portion 220. Specifically, when the cup portion P1 is formed, the portion of the membrane F located outside the long side S1 of the forming hole 110 can be pulled inward to a greater extent than the portion of the membrane F located outside the short side S2 of the forming hole 110. Therefore, in this invention, since the first fixing portion 120 and the second fixing portion 220 are formed on the long side S1 of the forming hole 110, forming defects in the battery casing 54 can be prevented, and its quality can be improved.

[0119] Furthermore, since the first protrusion 122 / second protrusion 222 and the first hole 124 / second hole 224 are alternately formed in the first fixing portion 120 / second fixing portion 220, the problem of film F curling and deterioration can be mitigated even when the first fixing portion 120 is formed to extend along the long side S1 of the forming hole 110 and the predetermined portion R is formed by pressing and extending the first fixing portion 120 and the second fixing portion 220.

[0120] According to an embodiment of the present invention, the forming hole 110 includes: a pair of long sides S1 arranged on one side and opposite sides; and a pair of short sides S2 respectively connecting the two ends of the pair of long sides S1. The mold 100 may include a pair of first fixing portions 120 respectively formed on one side and opposite sides of the pair of long sides S1, and the pair of long sides S1 are inserted between the pair of first fixing portions 120. The pair of first fixing portions 120 correspond to the long side S1 arranged on one side and the long side S1 arranged on opposite sides, and the pair of first fixing portions 120 are formed to extend along the corresponding long side S1 or extend obliquely to the corresponding long side S1. The demolding device 200 may include a pair of second fixing portions 220 respectively formed along the pair of first fixing portions 120 and respectively facing the pair of first fixing portions 120 perpendicularly.

[0121] Therefore, when the membrane F is stretched during the forming of the cup portion P1, the portion of the membrane F located outside the two long sides S1 of the forming hole 110 can be effectively prevented from being pulled inward through the first fixing portion 120 and the second fixing portion 220. Specifically, when the cup portion P1 is formed, the portion of the membrane F located outside the two long sides S1 of the forming hole 110 can be pulled inward to a greater extent than the portion of the membrane F located outside the two short sides S2 of the forming hole 110. Therefore, in this invention, since the paired first fixing portion 120 and second fixing portion 220 are formed at the two long sides S1 of the forming hole 110, forming defects in the battery casing 54 can be prevented, and its quality can be improved.

[0122] Furthermore, since protrusions 122, 222 and holes 124, 224 are alternately formed in the fixing portions 120, 220, the problem of film F curling and deterioration can be mitigated even when a pair of first fixing portions 120 are formed to extend along the two long sides S1 of the forming hole 110 and a pair of predetermined portions R are extended and pressed and formed by a pair of first fixing portions 120 and second fixing portions 220.

[0123] According to an embodiment of the present invention, the film F formed by the punch 300 at the upper part of the mold 100 when pressed and fixed by the demolding device 200 may have a bend line L1, which extends along the extension direction of the edge S or in a direction inclined relative to the extension direction of the edge S. The mold 100 may include a pair of first fixing portions 120 formed symmetrically with respect to the bend line L1. The demolding device 200 may include a pair of second fixing portions 220, which are respectively formed along the pair of first fixing portions 120 and respectively face the pair of first fixing portions 120 perpendicularly.

[0124] Therefore, when the membrane F is bent and folded at the bend line L1, a pair of predetermined portions R of the membrane F formed by the pair of first fixing portions 120 and second fixing portions 220 can face each other and contact each other. Figure 13 Each predetermined portion R can be formed with unevenness in the thickness direction by alternatingly arranging one or more (e.g., n1) first portions R1 and one or more (e.g., n2) second portions R2 along the extension direction of each predetermined portion R. Since the unevenness in the thickness direction of a pair of predetermined portions R are symmetrical to each other, the gap H extending across the predetermined portions R can be reliably and stably ensured between the pair of predetermined portions R. Figure 13 Electrolytes can be easily and stably injected into cup P1 through gap H.

[0125] According to an embodiment of the present invention, the number of one or more first protrusions 122 may be one more or one less than the number of one or more second protrusions 222.

[0126] Therefore, the first fixing part 120 may be provided with a first protrusion 122 or a first hole 124 at both ends in the extending direction of the first fixing part 120. Therefore, the predetermined part R may be formed to protrude upward or downward at both ends in the extending direction of the first fixing part 120. Figure 12 As a result, curling in the same direction (e.g., downward or upward) can occur at both ends of the predetermined portion R, thus facilitating the transport (e.g., adsorption transport), alignment, or processing of the membrane F or the individual battery housing 54.

[0127] According to an embodiment of the present invention, the number of second protrusions 222 may be greater than the number of first protrusions 122.

[0128] Therefore, since the curling in one thickness direction (e.g., upward direction) is mainly generated by the first fixing part 120 in the predetermined part R, the curling in the opposite thickness direction (e.g., downward direction) that occurs at the edge part P2 of the film F due to the forming of the cup part P1 can be effectively reduced as described above.

[0129] Furthermore, since the second portion R2 is formed at both ends of the predetermined portion R in the extending direction of the first fixing portion 120 ( Figure 12 Therefore, the two ends of the predetermined portion R can curl toward one side in the thickness direction (e.g., upward direction). Thus, as described above, the curling that occurs at the edge portion P2 of the film F due to the forming of the cup portion P1, bending toward the opposite side in the thickness direction (e.g., downward direction), can be effectively mitigated.

[0130] According to an embodiment of the present invention, the number of one or more first protrusions 122 may be one and the number of one or more second protrusions 222 may be two, or the number of one or more first protrusions 122 may be two and the number of one or more second protrusions 222 may be one.

[0131] Therefore, the first fixing part 120 and the second fixing part 220, which cause curling in the same direction at both ends of the predetermined portion R in the extending direction of the first fixing part 120, can be achieved using a minimum number of first protrusions 122 and second protrusions 222, as well as first holes 124 and second holes 224. As a result, during the forming of the cup portion P1, the total stretch of the membrane F in the thickness direction along the extending direction of the first fixing part 120 is minimized, so that the membrane F will not deform or be damaged.

[0132] According to an embodiment of the invention, each of one or more first protrusions 122, each of one or more first holes 124, each of one or more second protrusions 222, and each of one or more second holes 224 may be formed to extend along edge S. The lengths of one or more first protrusions 122 may be equal to each other, and the lengths of one or more second protrusions 222 may be equal to each other.

[0133] Therefore, curling in the membrane F or battery housing 54 can be uniformly generated and suppressed. As a result, curling generated in the membrane F or battery housing 54 by the first fixing part 120 and the second fixing part 220 can be uniformly and effectively reduced.

[0134] According to an embodiment of the present invention, the battery casing forming apparatus 10 may further include: a conveying unit that conveys, along its length, a film F formed by a punch 300 at the upper part of the mold 100 when pressed and fixed by a demolding device 200; and a cutter that cuts, along its width, a portion of the film F having a cup portion P1 formed by the punch 300. The edge S may be one side or the opposite side of the forming hole 110 in the width direction. The first fixing portion 120 may be formed outside the forming hole 110 in the width direction.

[0135] Therefore, when the membrane F is stretched during the forming of the cup portion P1, it is effective to prevent the outer portion of the membrane F in the width direction from being pulled inward through the first fixing portion 120 and the second fixing portion 220. Specifically, when the cup portion P1 is formed, the degree to which the membrane F is pulled inward from the outside in the width direction can be greater than the degree to which the membrane F is pulled in the length direction. This is because the membrane F elongates in the length direction, and the forming of the cup portion P1 is performed before being cut by the cutter. Therefore, in this invention, since the first fixing portion 120 and the second fixing portion 220 are formed outside the forming hole 110 in the width direction, forming defects in the battery casing 54 can be prevented, and its quality can be improved.

[0136] According to an embodiment of the present invention, the battery housing may include: a cup portion P1 that protrudes in the thickness direction and has an internal space for accommodating an electrode assembly 52; and an edge portion P2 that surrounds and is sealed around the cup portion P1 and has a predetermined portion R. The predetermined portion R may include one or more first portions R1 and one or more second portions R2 that are alternately formed. Each of the one or more first portions R1 may be at least partially formed as a recess on one side facing the thickness direction. Each of the one or more second portions R2 may be formed as protruding further than the edge portion P2 outside the predetermined portion R on the opposite side facing the thickness direction.

[0137] Therefore, the problem of curling and deterioration of the battery casing 54 caused by the predetermined portion R can be mitigated. As a result, defects in the transportation, alignment, processing, sealing, etc. of the battery casing 54 can be prevented.

[0138] Furthermore, due to the alternating arrangement of one or more first portions R1 and one or more second portions R2, the edge portion P2 of the membrane F can have bending resistance. Therefore, it can facilitate the transport, alignment, processing, sealing, etc., of the battery housing 54.

[0139] Furthermore, by alternately arranging one or more first portions R1 and one or more second portions R2, the predetermined portion R can have unevenness in the thickness direction. Therefore, the gap H extending across the predetermined portion R can be reliably and stably ensured. Figure 13 Electrolytes can be easily and stably injected into cup P1 through gap H.

[0140] According to an embodiment of the present invention, the predetermined portion R can be formed together with the cup portion P1.

[0141] Therefore, even when a predetermined portion R is pressed and formed during the forming of the cup portion P1 to fix the battery housing 54 or the membrane F, the problem of curling and deterioration of the battery housing 54 caused by the predetermined portion R can be mitigated.

[0142] According to an embodiment of the present invention, the predetermined portion R may be formed to extend along or obliquely to the cup portion P1. One or more first portions R1 and one or more second portions R2 may be formed alternately along the extension direction of the predetermined portion R.

[0143] Therefore, even when the cup portion P1 is long, curling can be effectively reduced. Furthermore, when a predetermined portion R is pressed and formed during the forming of the cup portion P1 to secure the battery housing 54 or the membrane F, forming defects in the battery housing 54 can be prevented, and its quality can be improved.

[0144] In addition to the aforementioned beneficial effects, the specific effects of the present invention will be further described in detail in describing the specific features of the present invention. Attached Figure Description

[0145] Figure 1 It is a schematic diagram showing an exploded three-dimensional view of a conventional secondary battery.

[0146] Figure 2 and Figure 3 These are 3D and cross-sectional views of a conventional battery casing forming equipment.

[0147] Figure 4 It shows the use Figure 2 and Figure 3A cross-sectional view of the membrane formed by the battery casing forming equipment.

[0148] Figure 5 It is shown Figure 4 A cross-sectional view of the membrane formed in the process of curling.

[0149] Figure 6 It is shown Figure 5 A cross-sectional view of the membrane curling up when the first part is absent.

[0150] Figure 7 This is a perspective view of a battery casing forming apparatus according to an embodiment of the present invention.

[0151] Figure 8 It is along Figure 7 The cross-sectional view taken from line 8-8'.

[0152] Figure 9 It shows the use Figure 8 A cross-sectional view of the membrane formed by the battery casing forming equipment.

[0153] Figure 10 It is along Figure 7 The cross-sectional view taken from line 10-10'.

[0154] Figure 11 It shows the use Figure 10 A cross-sectional view of the membrane formed by the battery casing forming equipment.

[0155] Figure 12 It shows the use Figures 7 to 11 A plan view of the membrane formed by the battery casing forming equipment.

[0156] Figure 13 This schematically illustrates the process of cutting and bending according to an embodiment. Figure 12 A cross-sectional view of the battery casing formed by the membrane.

[0157] Figure 14 This schematically illustrates the process of cutting and bending according to another embodiment. Figure 12 A three-dimensional view of the battery casing formed by the membrane.

[0158] [Explanation of reference numerals in the attached figures]

[0159] 10: Battery casing forming equipment

[0160] 50: Secondary battery

[0161] 52: Electrode assembly; 54: Battery casing

[0162] P1: Cup area P2: Edge area

[0163] H: Gap

[0164] F: Membrane R: Pre-defined portion

[0165] R1: Part 1 R2: Part 2

[0166] 100: Mold

[0167] 110: Forming hole S: Edge

[0168] S1: Long side; S2: Short side

[0169] 120: First fixed part

[0170] 122: First protrusion; 124: First hole

[0171] 200: Demolding device; 210: Punch hole

[0172] 220: Second fixing part

[0173] 222: Second protrusion; 224: Second hole

[0174] 300: Punch Detailed Implementation

[0175] The above-described objects, features, and advantages will now be described in detail with reference to the accompanying drawings, enabling those skilled in the art to realize the technical concept of the present invention. In describing the present invention, detailed descriptions of prior art related to the present invention will be omitted where it is determined that such detailed descriptions would unnecessarily obscure the spirit of the present invention. Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to indicate the same or similar parts.

[0176] Although terms such as "first" and "second" are used to describe various elements, these elements are of course not limited by these terms. These terms are only used to distinguish one element from another, and unless otherwise specified, the first element may also be the second element.

[0177] Throughout this specification, unless otherwise stated, each element may be singular or plural.

[0178] In the following text, “arranging a component above (or below) a component” or “arranging a component at the top (or bottom) of a component” means not only “arranging a component to contact the upper (or lower) surface”, but also “arranging a component above the upper (or lower) surface and inserting another component therebetween”.

[0179] Furthermore, when a component is described as “connected to another component,” “linked to another component,” or “in contact with another component,” it should be understood that the component may be “directly connected to another component,” “directly linked to another component,” or “in direct contact with another component,” or the component may be “connected to another component,” “linked to another component,” or “in contact with another component” with another component inserted therein or via another component.

[0180] Unless the context clearly specifies otherwise, the singular forms used herein include the plural forms. Terms such as “consisting of” or “comprising” as used herein should not be construed as including all elements or steps described in the specification, and should be construed as excluding some of the elements or steps, or including additional elements or steps.

[0181] Furthermore, the length direction, width direction, and thickness direction, which will be described later, can be the length direction, width direction, and thickness direction of the membrane F or the battery housing 54.

[0182] Figure 1 It is a schematic diagram showing an exploded three-dimensional view of a conventional secondary battery. Figure 2 and Figure 3 These are, respectively, a 3D view and a cross-sectional view of a conventional battery casing forming equipment. Figure 4 It shows the use Figure 2 and Figure 3 A cross-sectional view of the membrane formed by the battery casing forming equipment. Figure 5 It is shown Figure 4 A cross-sectional view of the membrane formed in the process of curling. Figure 6 It is shown Figure 5 A cross-sectional view of the membrane curling up when the first part is absent. Figure 7 This is a perspective view of a battery casing forming apparatus according to an embodiment of the present invention. Figure 8 It is along Figure 7 The cross-sectional view taken from line 8-8'. Figure 9 It shows the use Figure 8 A cross-sectional view of the membrane formed by the battery casing forming equipment. Figure 10 It is along Figure 7 The cross-sectional view taken from line 10-10'. Figure 11 It shows the use Figure 10 A cross-sectional view of the membrane formed by the battery casing forming equipment. Figure 12 It shows the use Figures 7 to 11 A plan view of the membrane formed by the battery casing forming equipment. Figure 13 This schematically illustrates the process of cutting and bending according to an embodiment. Figure 12 A cross-sectional view of the battery casing formed by the membrane. Figure 14 This schematically illustrates the process of cutting and bending according to another embodiment. Figure 12 A three-dimensional view of the battery casing formed by the membrane.

[0183] [Standard rechargeable batteries]

[0184] Reference Figure 1 According to the embodiments, a conventional secondary battery 50 may include an electrode assembly 52 and a battery casing 54. The secondary battery 50 may be a pouch-type secondary battery.

[0185] Electrode assembly 52 can be formed by alternately stacking electrodes and diaphragms.

[0186] The battery housing 54 may include a cup portion P1 and an edge portion P2. The cup portion P1 has a recessed shape to accommodate the electrode assembly 52 therein, and the edge portion P2 surrounds the cup portion P1 and performs a seal at the edge portion P2. The cup portion P1 may be as follows: Figure 1 The shown arrangement is on each of the left and right sides of the battery housing 54, or with Figure 1 Unlike other battery housings, the cup portion P1 can be located on only one of the left and right sides of the battery housing 54. The battery housing 54 can use a design described later as follows: Figures 2 to 4 The conventional battery casing forming equipment 10 shown is used for manufacturing.

[0187] After the electrode assembly 52 is housed in the cup portion P1, the battery housing 54 is folded and the left and right edges P2 of the electrode assembly 52 facing each other are sealed (e.g., by heat fusion), thereby completing the secondary battery 50.

[0188] also, Figure 1 The outer portion of the edge P2 of the battery casing 54 can be cut off, so that the first portion R1 formed by the conventional battery casing forming equipment 10, described later, can be removed. Therefore, the first portion R1, described later, can be removed without... Figure 1 The battery casing 54 is shown.

[0189] [Conventional battery casing forming equipment]

[0190] Reference Figures 2 to 4 A conventional battery casing forming device 10 may include: a mold 100; a demolding device 200; and a punch 300.

[0191] The membrane F can be placed on the upper surface of the mold 100. The mold 100 may include: a forming hole 110; and a first fixing part 120.

[0192] Here, the membrane F can be in sheet form. After the membrane F is formed by the battery casing forming equipment 10, the membrane F can be processed (e.g., along...). Figure 12The membrane F may include, for example, an outer layer for insulating and protecting the electrode assembly 52, a metal layer for maintaining strength and blocking external substances, and an inner layer for sealing (thermal fusion).

[0193] The forming hole 110 can be formed in the upper surface of the mold 100. The forming hole 110 can be recessed downward or can be formed to extend downward through.

[0194] The first fixing portion 120 may be formed on the upper surface of the mold 100. The first fixing portion 120 may include a first protrusion 122 formed to protrude upward.

[0195] The first fixing part 120 may be spaced apart from the forming hole 110 by a predetermined distance. The first fixing part 120 may be formed to extend along the edge S of the forming hole 110 or to extend obliquely to the edge S.

[0196] The demolding device 200 can press and fix the film F to the upper part of the mold 100. The demolding device 200 may include a punch hole 210 and a second fixing part 220.

[0197] The punch hole 210 can be formed at a position corresponding to the forming hole 110. The punch hole 210 can be formed to extend vertically through the demolding device 200.

[0198] The second fixing portion 220 may be formed on the lower surface of the demolding device 200. The second fixing portion 220 may face the first fixing portion 120 perpendicularly. The second fixing portion 220 may include a second hole 224. The second hole 224 may be formed to be recessed upward or to extend upward through, and the first protrusion 122 may be inserted into the second hole 224.

[0199] The second fixing portion 220 may be formed along the first fixing portion 120. For example, the second fixing portion 220 may be spaced apart from the punch hole 210 by a predetermined distance. The second fixing portion 220 may extend along the edge of the punch hole 210 or extend obliquely to the edge of the punch hole 210.

[0200] The punch 300 can pass through the punch hole 210 of the demolding device 200. The punch 300 can be inserted into the forming hole 110 of the mold 100. Therefore, the punch 300 can form a cup portion P1 on the film F. At this time, the first fixing part 120 and the second fixing part 220 can prevent the edge portion P2 of the film F from being pulled towards the cup portion P1. As a result, forming defects of the film F or the individual battery casing 54 can be prevented, and its quality can be improved.

[0201] Furthermore, when the cup portion P1 is formed, a predetermined portion R of the membrane F located between the first fixing portion 120 and the second fixing portion 220 can be pressed and formed by the first fixing portion 120 and the second fixing portion 220. Specifically, the predetermined portion R may include a first portion R1 formed to protrude upward by the first protrusion 122. Figure 4 ).

[0202] Reference Figure 5 and Figure 6 , and the membrane F (without the first part R1) Figure 6 Compared to the membrane F( with the first part R1), Figure 5 The curling of the edge portion P2 in the membrane F may deteriorate. When the curling deteriorates, problems such as delivery (e.g., adsorption delivery) defects, alignment defects, or processing defects may occur in the membrane F or the individual battery casing 54. Therefore, a method to mitigate this curling is needed.

[0203] [The battery casing forming apparatus of the present invention]

[0204] Reference Figures 7 to 13 The battery casing forming apparatus 10 according to an embodiment of the present invention may include: a mold 100; a demolding device 200; and a punch 300, which is similar to a conventional battery casing forming apparatus 10. The battery casing forming apparatus 10 according to an embodiment of the present invention may also include: a conveying unit; and / or a cutter. Differences compared to a conventional battery casing forming apparatus 10 will be described below.

[0205] The first fixing portion 120 may be formed on the upper surface of the mold 100. The first fixing portion 120 may include one or more first protrusions 122 and one or more first holes 124. For example, the first fixing portion 120 may include n1 first protrusions 122 (where n1 is a natural number) and n2 first holes 124 (where n2 is a natural number that satisfies |n2-n1|<=1).

[0206] Each of one or more first protrusions 122 may be formed to project upward from the upper surface of the mold 100. Each of one or more first holes 124 may be formed to be recessed downward from the upper surface of the mold 100, or may be formed to extend downward through. One or more first protrusions 122 and one or more first holes 124 may be formed alternately.

[0207] The second fixing portion 220 may be formed on the lower surface of the demolding device 200. The second fixing portion 220 may face the first fixing portion 120 perpendicularly. The second fixing portion 220 may include one or more second protrusions 222 and one or more second holes 224. For example, the second fixing portion 220 may include n2 second protrusions 222 and n1 second holes 224.

[0208] Each of one or more second protrusions 222 may be configured to project downward from the lower surface of the demolding device 200. One or more (e.g., n²) second protrusions 222 may be respectively inserted into one or more (e.g., n²) first holes 124. Each of one or more second holes 224 may be configured to be recessed upward from the lower surface of the demolding device 200, or may be configured to extend upward through. One or more (e.g., n¹) first protrusions 122 may be respectively inserted into one or more (e.g., n¹) second holes 224.

[0209] Therefore, during the forming of the cup portion P1, even if the predetermined portion R of the membrane F located between the first fixing portion 120 and the second fixing portion 220 is pressed and formed by the first fixing portion 120 and the second fixing portion 220, the problem of membrane F curling and deterioration caused by the predetermined portion R can be mitigated. Therefore, defects in the delivery (e.g., adsorption delivery), alignment, processing, sealing, etc. of the membrane F or the individual battery housing 54 can be prevented.

[0210] Specifically, when a predetermined portion R of the membrane F is formed by a first fixing portion 120 and a second fixing portion 220, the predetermined portion R may include one or more first portions R1 and one or more second portions R2 arranged alternately. Figure 11 and Figure 12 Here, each of one or more first portions R1 may be formed to project upward by each of one or more first protrusions 122, and each of one or more second portions R2 may be formed to project downward by each of one or more second protrusions 222. Figure 11 and Figure 12 Because the first portion R1 is formed to protrude upwards, one side (e.g., the upper part) of the membrane F or each layer of the membrane F is stretched more in the thickness direction than the opposite side (e.g., the lower part), and because the second portion R2 is formed to protrude downwards, the opposite side of the membrane F or each layer of the membrane F can be stretched more in the thickness direction than one side. Therefore, for example, the first portion R1 can tend to cause curling towards the opposite side (e.g., downwards) in the thickness direction, and the second portion R2 can tend to cause curling towards one side (e.g., upwards) in the thickness direction. That is, the first portion R1 and the second portion R2 can tend to cause curling in opposite directions. According to the invention, since one or more first portions R1 and one or more second portions R2 are arranged alternately, curling can be offset, thereby suppressing / mitigating curling formation.

[0211] Furthermore, due to the alternating arrangement of one or more first portions R1 and one or more second portions R2, the edge portion P2 of the membrane F can have bending resistance. Therefore, it can facilitate the transport, alignment, processing, or sealing of the membrane F or the individual battery housing 54.

[0212] Furthermore, the predetermined portion R can have unevenness in the thickness direction by alternately arranging one or more first portions R1 and one or more second portions R2. Therefore, when the predetermined portion R is covered by the film F, the unevenness can reliably and stably ensure the gap H extending across the predetermined portion R between the predetermined portion R and the film F. Figure 13 Electrolytes can be easily and stably injected into cup P1 through gap H.

[0213] The first fixing portion 120 may be spaced apart from the forming hole 110 by a predetermined distance. The first fixing portion 120 may be formed to extend along the edge S of the forming hole 110 or to extend obliquely to the edge S. The second fixing portion 220 may be formed along the first fixing portion 120. For example, the second fixing portion 220 may be spaced apart from the punch hole 210 by a predetermined distance and extend along the edge S of the punch hole 210 or to extend obliquely to the edge S of the punch hole 210.

[0214] Therefore, forming defects in the battery casing 54 can be prevented, and its quality can be improved. Furthermore, even if the edge S of the forming hole 110 is relatively long, curling can be effectively reduced.

[0215] The first fixing part 120 can be formed to extend along the edge S.

[0216] Therefore, when the membrane F is stretched during the forming of the cup portion P1, the membrane F can be stably pressed and fixed by the first fixing portion 120 and the second fixing portion 220, and the stretching amount of the membrane F becomes uniform, thereby preventing forming defects of the battery casing 54 and improving its quality.

[0217] One or more first protrusions 122 and one or more first holes 124 may be alternately formed along the extending direction of the first fixing portion 120. Here, the extending direction of the first fixing portion 120 may be, for example, the length direction of the membrane F. Figure 12 ).

[0218] Therefore, conventional battery casing forming equipment can be directly used simply by changing the first fixing part 120 and the second fixing part 220. Furthermore, since the position of the predetermined portion R of the film F formed by the first fixing part 120 and the second fixing part 220 is the same as in the prior art, conventional secondary battery manufacturing equipment can be directly used.

[0219] Furthermore, when the cup portion P1 is formed, the membrane F is stretched in the thickness direction (upward and downward) along the extending direction of the first fixing portion 120 at both ends of one or more first protrusions 122 and at both ends of one or more second protrusions 222, so that the membrane F can be firmly bonded and fixed to a total of 2 (n1+n2) protruding ends. Therefore, forming defects in the battery casing 54 can be prevented, and its quality can be improved.

[0220] Furthermore, even if the length of the side S of the forming hole 110 is relatively long, curling can be effectively reduced.

[0221] Each of one or more first protrusions 122, each of one or more first holes 124, each of one or more second protrusions 222, and each of one or more second holes 224 may be configured to extend along the extension direction of the first fixing portion 120.

[0222] Therefore, when the membrane F is stretched during the forming of the cup portion P1, the first fixing portion 120 and the second fixing portion 220 can stably press and fix the membrane F.

[0223] Furthermore, the number of first protrusions 122 and second protrusions 222, as well as the number of first holes 124 and second holes 224, can be reduced. As a result, since the total stretch of the membrane F in the thickness direction (upward and downward) along the extension direction of the first fixing portion 120 is reduced during the forming of the cup portion P1, the membrane F will not deform or be damaged even when the protrusions 122 and 222 and the holes 124 and 224 are alternately formed in the fixing portions 120 and 220.

[0224] One or more (e.g., n1) first protrusions 122 may have the same length as each other, and one or more (e.g., n2) second protrusions 222 may have the same length as each other. Here, length may refer to the length of protrusions 122 and 222 in the direction of extension.

[0225] Therefore, curling in the membrane F or battery housing 54 can be uniformly generated and suppressed. As a result, curling generated in the membrane F or battery housing 54 by the first fixing part 120 and the second fixing part 220 can be uniformly and effectively reduced.

[0226] The total length of one or more (e.g., n2) second protrusions 222 can be greater than the total length of one or more (e.g., n1) first protrusions 122.

[0227] Therefore, since the total length of one or more (e.g., n2) second portions R2 of the predetermined portions R is greater than the total length of one or more (e.g., n1) first portions R1, the degree of curling in one thickness direction (e.g., upward direction) of the membrane F or battery housing 54 can be increased. Thus, curling in the opposite thickness direction (e.g., downward direction) occurring at the edge portion P2 of the membrane F due to the forming of the cup portion P1 can be effectively mitigated.

[0228] Furthermore, depending on the forming of the cup portion P1, a curl may occur at the edge portion P2 of the film F, where the entire film bends toward the opposite side in the thickness direction (e.g., downward direction). Figure 6 This is because during the forming of the cup portion P1, the edge portion P2 of the membrane F is stretched more on one side (e.g., the upper part) in the thickness direction than on the opposite side (e.g., the lower part) in the thickness direction, or because of the difference in the elastic recovery rate between one side (e.g., the upper layer) and the opposite side (e.g., the lower layer) of the membrane F. Therefore, when the total length of one or more (e.g., n2) second protrusions 222 increases such that the degree of curling towards one side (e.g., upward direction) in the thickness direction increases, the curling towards the opposite side (e.g., downward direction) in the thickness direction that occurs at the edge portion P2 of the membrane F during the forming of the cup portion P1 can be effectively mitigated.

[0229] According to an embodiment of the present invention, the end of each first protrusion 122 and the end of the inner surface of each first hole 124 adjacent to each first protrusion 122 can directly contact and connect with each other. Furthermore, the end of each second protrusion 222 and the end of the inner surface of each second hole 224 adjacent to each second protrusion 222 can directly contact and connect with each other. Here, "end" can refer to the end in the extending direction of the first fixing portion 120. Figure 10 and Figure 11 ).

[0230] Therefore, the section of membrane F that is pressed and fixed by the first fixing part 120 and the second fixing part 220 can be continuous in the extending direction of the first fixing part 120. Thus, since membrane F is continuously and stably pressed and fixed, forming defects in the battery casing 54 can be prevented, and its quality can be improved.

[0231] In the extending direction of the first fixing part 120, the section in which the first fixing part 120 is formed can completely include the section in which the edge S is formed. That is, in the extending direction of the first fixing part 120, the section in which the edge S of the forming hole 110 is formed can completely overlap with the section in which the first fixing part 120 is formed.

[0232] Therefore, forming defects in the battery casing 54 can be prevented, and its quality can be improved.

[0233] Furthermore, the forming hole 110 may include a long side S1 and a short side S2 shorter than the long side S1. Specifically, the cross-section of the forming hole 110 cut along a plane perpendicular to the vertical direction may have a long side S1 and a short side S2. Here, the first fixing part 120 may be formed to extend along the long side S1 or inclined to the long side S1.

[0234] Therefore, when the membrane F is stretched during the forming of the cup portion P1, the portion of the membrane F located outside the long side S1 of the forming hole 110 can be effectively prevented from being pulled inward through the first fixing portion 120 and the second fixing portion 220. Specifically, when the cup portion P1 is formed, the portion of the membrane F located outside the long side S1 of the forming hole 110 can be pulled inward to a greater extent than the portion of the membrane F located outside the short side S2 of the forming hole 110. Therefore, in this invention, since the first fixing portion 120 and the second fixing portion 220 are formed on the long side S1 of the forming hole 110, forming defects in the battery casing 54 can be prevented, and its quality can be improved.

[0235] Furthermore, since the first protrusion 122 / second protrusion 222 and the first hole 124 / second hole 224 are alternately formed in the first fixing portion 120 / second fixing portion 220, even if the first fixing portion 120 is formed to extend along the long side S1 of the forming hole 110 and the predetermined portion R is formed by pressing the first fixing portion 120 and the second fixing portion 220 to extend, the problem of film F curling and deterioration can be mitigated.

[0236] The forming hole 110 includes: a pair of long sides S1 arranged on one side and opposite sides; and a pair of short sides S2 respectively connecting the two ends of the pair of long sides S1. Specifically, for example, the cross-section of the forming hole 110 cut along a plane perpendicular to the vertical direction can be a rectangle having a pair of long sides S1 and a pair of short sides S2. Here, the mold 100 may include a pair of first fixing parts 120, and the demolding device 200 may include a pair of second fixing parts 220.

[0237] A pair of first fixing portions 120 may be formed on one side and the opposite side of a pair of long sides S1, respectively, and the pair of long sides S1 are inserted between the pair of first fixing portions 120. The pair of first fixing portions 120 may correspond to the long side S1 arranged on one side and the long side S1 arranged on the opposite side, respectively. The pair of first fixing portions 120 may be formed to be spaced apart from the corresponding long side S1 by a predetermined distance. The pair of first fixing portions 120 may extend along the corresponding long side S1 or extend obliquely to the corresponding long side S1, respectively.

[0238] A pair of second fixing parts 220 may be formed along a pair of first fixing parts 120. The pair of second fixing parts 220 may face the pair of first fixing parts 120 perpendicularly.

[0239] Therefore, when the membrane F is stretched during the forming of the cup portion P1, the portion of the membrane F located outside the two long sides S1 of the forming hole 110 can be effectively prevented from being pulled inward through the first fixing portion 120 and the second fixing portion 220. Specifically, when the cup portion P1 is formed, the portion of the membrane F located outside the two long sides S1 of the forming hole 110 can be pulled inward to a greater extent than the portion of the membrane F located outside the two short sides S2 of the forming hole 110. Therefore, in this invention, since the paired first fixing portion 120 and second fixing portion 220 are formed at the two long sides S1 of the forming hole 110, forming defects in the battery casing 54 can be prevented, and its quality can be improved.

[0240] Furthermore, since protrusions 122, 222 and holes 124, 224 are alternately formed in the fixing portions 120, 220, the problem of film F curling and deterioration can be mitigated even when a pair of first fixing portions 120 are formed to extend along the two long sides S1 of the forming hole 110 and a pair of predetermined portions R are extended and pressed and formed by a pair of first fixing portions 120 and second fixing portions 220.

[0241] In addition, such as Figure 12 As shown, the film F may have a bend line L1 extending along the extension direction of the edge S or extending in a direction inclined relative to the extension direction of the edge S. Here, the mold 100 may include a pair of first fixing parts 120, and the demolding device 200 may include a pair of second fixing parts 220.

[0242] A pair of first fixing portions 120 may be formed symmetrically with respect to the bend line L1. A pair of second fixing portions 220 may be formed along the pair of first fixing portions 120 respectively, and may face the pair of first fixing portions 120 perpendicularly respectively.

[0243] Therefore, when the membrane F is bent and folded at the bend line L1, a pair of predetermined portions R of the membrane F formed by the pair of first fixing portions 120 and second fixing portions 220 can face each other and contact each other. Figure 13 Each predetermined portion R can be formed with unevenness in the thickness direction by alternatingly arranging one or more (e.g., n1) first portions R1 and one or more (e.g., n2) second portions R2 along the extension direction of each predetermined portion R. Since the unevenness in the thickness direction of a pair of predetermined portions R are symmetrical to each other, the gap H extending across the predetermined portions R can be reliably and stably ensured between the pair of predetermined portions R. Figure 13Electrolytes can be easily and stably injected into cup P1 through gap H.

[0244] Specifically, when the membrane F bends and folds at the bend line L1, the edge portions P2 on one and opposite sides of the membrane F can face each other in the thickness direction. Here, the first portions R1 on both sides of the edge portion P2 can contact each other inward in the thickness direction, thereby expanding both sides of the edge portion P2. Therefore, the second portions R2 on both sides of the edge portion P2 can reliably and stably open in the thickness direction, and the electrolyte can be stably injected through the gap H between the second portions R2 on both sides of the edge portion P2. Figure 13 ).

[0245] The number of one or more first protrusions 122 (e.g., n1) may be one more or one less than the number of one or more second protrusions 222 (e.g., n2). Figure 7 , Figure 10 and Figure 11 ).

[0246] Therefore, the first fixing part 120 may be provided with a first protrusion 122 or a first hole 124 at both ends in the extending direction of the first fixing part 120. Therefore, the predetermined part R may be formed to protrude upward or downward at both ends in the extending direction of the first fixing part 120. Figure 12 As a result, curling in the same direction (e.g., downward or upward) can occur at both ends of the predetermined portion R, thus facilitating the transport (e.g., adsorption transport), alignment, or processing of the membrane F or the individual battery housing 54.

[0247] The number of second protrusions 222 (e.g., n2) can be greater than the number of first protrusions 122 (e.g., n1). Figure 7 , Figure 10 and Figure 11 ).

[0248] Therefore, since the curling in one thickness direction (e.g., upward direction) is mainly generated by the first fixing part 120 in the predetermined part R, the curling in the opposite thickness direction (e.g., downward direction) that occurs at the edge part P2 of the film F due to the forming of the cup part P1 can be effectively reduced as described above.

[0249] Furthermore, since the second portion R2 is formed at both ends of the predetermined portion R in the extending direction of the first fixing portion 120 ( Figure 12Therefore, the two ends of the predetermined portion R can curl toward one side in the thickness direction (e.g., upward direction). Thus, as described above, the curling that occurs at the edge portion P2 of the film F due to the forming of the cup portion P1, bending toward the opposite side in the thickness direction (e.g., downward direction), can be effectively mitigated.

[0250] The number of one or more first protrusions 122 (e.g., n1) can be 1 and the number of one or more second protrusions 222 (e.g., n2) can be 2, or the number of one or more first protrusions 122 (e.g., n1) can be 2 and the number of one or more second protrusions 222 (e.g., n2) can be 1.

[0251] Therefore, the first fixing part 120 and the second fixing part 220, which cause curling in the same direction at both ends of the predetermined portion R in the extending direction of the first fixing part 120, can be achieved using a minimum number of first protrusions 122 and second protrusions 222, as well as first holes 124 and second holes 224. As a result, during the forming of the cup portion P1, the total stretch of the membrane F in the thickness direction along the extending direction of the first fixing part 120 is minimized, so that the membrane F will not deform or be damaged.

[0252] As described above, when each of one or more first protrusions 122, each of one or more first holes 124, each of one or more second protrusions 222, and each of one or more second holes 224 are formed to extend along edge S, the lengths of one or more first protrusions 122 may be equal to each other, and the lengths of one or more second protrusions 222 may be equal to each other.

[0253] Therefore, curling in the membrane F or battery housing 54 can be uniformly generated and suppressed. As a result, curling generated in the membrane F or battery housing 54 by the first fixing part 120 and the second fixing part 220 can be uniformly and effectively reduced.

[0254] The conveying unit (not shown) can convey the film F along its length. Figure 12 ).

[0255] The cutter can cut a portion of the film F along its width, including the cup portion P1 formed by the punch 300. For example, the cutter can cut... Figure 12 The cutting line L2 is shown.

[0256] The first fixing portion 120 may be formed to extend along one or the opposite side of the forming hole 110 in the width direction, or it may be formed to extend obliquely to one or the opposite side of the forming hole 110 in the width direction. The first fixing portion 120 may be formed outside the forming hole 110 in the width direction.

[0257] Therefore, when the membrane F is stretched during the forming of the cup portion P1, it is effective to prevent the outer portion of the membrane F in the width direction from being pulled inward through the first fixing portion 120 and the second fixing portion 220. Specifically, when the cup portion P1 is formed, the degree to which the membrane F is pulled inward from the outside in the width direction can be greater than the degree to which the membrane F is pulled in the length direction. This is because the membrane F elongates in the length direction, and the cup portion P1 forming is performed before being cut by the cutter. Therefore, in this invention, since the first fixing portion 120 and the second fixing portion 220 are formed outside the forming hole 110 in the width direction, forming defects in the battery casing 54 can be prevented, and its quality can be improved.

[0258] [The battery casing of the present invention]

[0259] Further reference Figure 14 According to an embodiment of the present invention, the battery casing 54 may include a cup portion P1 and an edge portion P2. Figure 14 The battery casing 54 can use the above-mentioned Figures 7 to 11 The battery casing is formed by the battery casing forming equipment 10.

[0260] The cup portion P1 may protrude along the thickness direction. The cup portion P1 may have an internal space. The electrode assembly 52 may be accommodated within the internal space.

[0261] Edge P2 may surround cup P1. Edge P2 may be sealed. For example, a pair of edges P2 facing each other in the thickness direction may be sealed by heat fusion. Edge P2 may have a predetermined portion R.

[0262] The predetermined portion R may include one or more (e.g., n1) first portions R1 and one or more (e.g., n2) second portions R2.

[0263] Each of one or more first portions R1 may be at least partially formed as a recess on one side (e.g., downward) in the thickness direction. Each of one or more second portions R2 may be formed to protrude further than the outer edge P2 of the predetermined portion R on the opposite side (e.g., upward) in the thickness direction. Here, the outer edge P2 of the predetermined portion R may be a portion of the edge P2 surrounding the predetermined portion R. One or more first portions R1 and one or more second portions R2 may be formed alternately.

[0264] Therefore, the problem of curling and deterioration of the battery casing 54 caused by the predetermined portion R can be mitigated. As a result, defects in the transportation, alignment, processing, sealing, etc., of the battery casing 54 can be prevented.

[0265] Furthermore, due to the alternating arrangement of one or more first portions R1 and one or more second portions R2, the edge portion P2 of the membrane F can have bending resistance. Therefore, it can facilitate the transport, alignment, processing, sealing, etc., of the battery housing 54.

[0266] Furthermore, by alternately arranging one or more first portions R1 and one or more second portions R2, the predetermined portion R can have unevenness in the thickness direction. Therefore, the gap H extending across the predetermined portion R can be reliably and stably ensured. Figure 13 Electrolytes can be easily and stably injected into cup P1 through gap H.

[0267] The predetermined portion R can be formed together with the cup portion P1.

[0268] Therefore, even when a predetermined portion R is pressed and formed during the forming of the cup portion P1 to fix the battery housing 54 or the membrane F, the problem of curling and deterioration of the battery housing 54 caused by the predetermined portion R can be mitigated.

[0269] The predetermined portion R may be formed to extend along or obliquely to the cup portion P1. One or more first portions R1 and one or more second portions R2 may be formed alternately along the extension direction of the predetermined portion R.

[0270] Therefore, even when the cup portion P1 is long, curling can be effectively reduced. Furthermore, when a predetermined portion R is pressed and formed during the forming of the cup portion P1 to secure the battery housing 54 or the membrane F, forming defects in the battery housing 54 can be prevented, and its quality can be improved.

[0271] Each of one or more first portions R1 and each of one or more second portions R2 may be configured to extend along the extension direction of a predetermined portion R. The lengths of one or more first portions R1 may be equal to each other. The lengths of one or more second portions R2 may be equal to each other. The total length of one or more second portions R2 may be greater than the total length of one or more first portions R1.

[0272] Furthermore, matters not mentioned in connection with the battery casing 54 of the present invention can be inferred from the battery casing forming apparatus 10 of the present invention described above.

[0273] It should be understood that the described embodiments are illustrative in all respects and not limiting, and the scope of the invention will be indicated by the appended claims rather than the detailed description described herein. Furthermore, the meaning and scope of the claims described below, as well as all changes and modifications derived from equivalent concepts, should be interpreted as being included within the scope of the invention.

[0274] Although the invention has been described with reference to exemplary drawings, it should be understood that the invention is not limited to the embodiments and drawings disclosed in this specification, and those skilled in the art will understand that various modifications are possible without departing from the scope and spirit of the invention. Furthermore, although the operational effects of the configuration according to the invention are not explicitly described in the description of embodiments of the invention, it should be understood that predictable effects will also be confirmed through configuration.

Claims

1. A battery casing forming apparatus, the battery casing forming apparatus comprising: A mold (100) comprising: a forming hole (110) formed in the upper surface of the mold (100), the forming hole (110) being recessed downward or formed to extend downward through; and a first fixing portion (120) formed on the upper surface; A demolding device (200) comprising: a punch hole (210) formed at a position corresponding to the forming hole (110) and formed to extend through it in a vertical direction; and a second fixing portion (220) formed on the lower surface of the demolding device (200) and perpendicularly facing the first fixing portion (120); and A punch (300) passes through the punch hole (210) and is inserted into the forming hole (110). The first fixing part (120) includes one or more alternating first protrusions (122) and one or more first holes (124), and The second fixing part (220) includes one or more second protrusions (222) and one or more second holes (224), wherein the one or more second protrusions (222) are respectively inserted into the one or more first holes (124) and the one or more first protrusions (122) are respectively inserted into the one or more second holes (224).

2. The battery casing forming equipment according to claim 1, wherein, The first fixing part (120) is formed to extend along the edge (S) of the forming hole (110) or to extend obliquely to the edge (S), and The second fixing part (220) is formed along the first fixing part (120).

3. The battery casing forming equipment according to claim 2, wherein, The first fixing part (120) is formed to extend along the edge (S).

4. The battery casing forming equipment according to claim 2 or 3, wherein, The one or more first protrusions (122) and the one or more first holes (124) are alternately formed along the extension direction of the first fixing part (120).

5. The battery casing forming equipment according to claim 4, wherein, Each of the first protrusions (122), each of the first holes (124), each of the second protrusions (222), and each of the second holes (224) are formed to extend along the extension direction of the first fixing portion (120).

6. The battery casing forming equipment according to claim 5, wherein, The lengths of the one or more first protrusions (122) are equal to each other, and The lengths of the one or more second protrusions (222) are equal to each other.

7. The battery casing forming equipment according to claim 5 or 6, wherein, The total length of the one or more second protrusions (222) is greater than the total length of the one or more first protrusions (122).

8. The battery casing forming apparatus according to any one of claims 4 to 7, wherein, The end of each of the first protrusions (122) and the end of the inner surface of each of the first holes (124) adjacent to each of the first protrusions (122) are in direct contact with and connected to each other, and The end of each of the second protrusions (222) and the end of the inner surface of each of the second holes (224) adjacent to each of the second protrusions (222) are in direct contact with and connected to each other.

9. The battery casing forming apparatus according to any one of claims 2 to 8, wherein, In the extending direction of the first fixing part (120), the section in which the first fixing part (120) is formed completely includes the section in which the edge (S) is formed.

10. The battery casing forming apparatus according to any one of claims 2 to 9, wherein, The formed hole (110) includes a long side (S1) and a short side (S2) shorter than the long side (S1), and The side (S) is the longer side (S1).

11. The battery casing forming apparatus according to claim 10, wherein, The formed hole (110) includes: a pair of long sides (S1) arranged on one side and opposite sides; and a pair of short sides (S2) respectively connecting the two ends of the pair of long sides (S1). The mold (100) includes a pair of first fixing portions (120) respectively formed on one side and the opposite side of the pair of long sides (S1), and the pair of long sides (S1) are inserted between the pair of first fixing portions (120). The pair of first fixing portions (120) correspond to the long side (S1) arranged on one side and the long side (S1) arranged on the opposite side, respectively, and the pair of first fixing portions (120) are respectively formed to extend along the corresponding long side (S1) or to extend obliquely to the corresponding long side (S1). The demolding device (200) includes a pair of second fixing parts (220), which are formed along the pair of first fixing parts (120) and face the pair of first fixing parts (120) perpendicularly.

12. The battery casing forming apparatus according to any one of claims 2 to 11, wherein, The film (F) formed by the punch (300) at the upper part of the mold (100) when pressed and fixed by the demolding device (200) has a bend line (L1), which extends along the extension direction of the edge (S) or in a direction inclined relative to the extension direction of the edge (S). The mold (100) includes a pair of first fixing parts (120) formed symmetrically with respect to the bend line (L1), and The demolding device (200) includes a pair of second fixing parts (220), which are formed along the pair of first fixing parts (120) and face the pair of first fixing parts (120) perpendicularly.

13. The battery casing forming apparatus according to any one of claims 4 to 8, wherein, The number of the one or more first protrusions (122) is one more or one less than the number of the one or more second protrusions (222).

14. The battery casing forming apparatus according to any one of claims 1 to 13, wherein, The number of the second protrusion (222) is greater than the number of the first protrusion (122).

15. The battery casing forming apparatus according to claim 13, wherein, The number of the one or more first protrusions (122) is 1 and the number of the one or more second protrusions (222) is 2, or the number of the one or more first protrusions (122) is 2 and the number of the one or more second protrusions (222) is 1.

16. The battery casing forming apparatus according to claim 13 or 15, wherein, Each of the first protrusions (122), each of the first holes (124), each of the second protrusions (222), and each of the second holes (224) are formed to extend along the edge (S), and Each of the first protrusions (122) has the same length as the others, and each of the second protrusions (222) has the same length as the others.

17. The battery casing forming apparatus according to any one of claims 2 to 13, 15 and 16, wherein the battery casing forming apparatus further comprises: A conveying unit that conveys along its length the film (F) formed by the punch (300) at the upper part of the mold (100) when pressed and fixed by the demolding device (200); and A cutter that cuts a portion of the membrane (F) along its width direction, having a cup portion (P1) formed by the punch (300). Wherein, the edge (S) is the edge (S) of the forming hole (110) on one side or the opposite side in the width direction, and The first fixing part (120) is formed on the outside of the forming hole (110) in the width direction.

18. A battery casing, the battery casing comprising: The cup portion (P1) protrudes along the thickness direction and has an internal space for accommodating the electrode assembly (52); as well as An edge portion (P2) surrounds and is sealed around the cup portion (P1), and the edge portion (P2) has a predetermined portion (R). The predetermined portion (R) includes one or more first portions (R1) and one or more second portions (R2) that are formed alternately. Each of the first portions (R1) is at least partially topographically recessed on one side toward the thickness direction, and Each of the second portions (R2) is formed to protrude further than the edge portion (P2) outside the predetermined portion (R) toward the opposite side in the thickness direction.

19. The battery casing according to claim 18, wherein, The predetermined portion (R) is formed together with the cup portion (P1).

20. The battery casing according to claim 18 or 19, wherein, The predetermined portion (R) is formed to extend along the cup portion (P1) or to extend obliquely to the cup portion (P1), and The one or more first portions (R1) and the one or more second portions (R2) are alternately formed along the extension direction of the predetermined portion (R).

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