A pouch for a secondary battery, a method of manufacturing the same, and a method of manufacturing a secondary battery

Abstract

The present invention relates to a pouch of a secondary battery in which a pouch one side and a pouch other side are formed in a length direction, the pouch including: a one side accommodation groove and an other side accommodation groove formed in a one side surface of the pouch one side and a one side surface of the pouch other side, respectively; a one side reinforcing portion formed on an other side surface of the pouch one side and configured to reinforce a strength so that the other side surface of the pouch one side is not rolled up or bent in a direction of the one side accommodation groove; and an other side reinforcing portion formed on an other side surface of the pouch other side and configured to reinforce a strength so that the other side surface of the pouch other side is not rolled up or bent in a direction of the other side accommodation groove.

Description

[0001] Cross Reference to Related Applications

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2020-0182647, filed on December 23, 2020, and Korean Patent Application No. 10-2021-0174922, filed on December 8, 2021, which are hereby incorporated by reference in their entirety. TECHNICAL FIELD

[0003] The present application relates to a pouch of a secondary battery and a method of manufacturing the same, and a method of manufacturing a secondary battery, and more particularly, to a pouch of a secondary battery and a method of manufacturing the same, and a method of manufacturing a secondary battery, which prevent curling such as rolling or bending. BACKGROUND

[0004] Generally, unlike a primary battery which is not rechargeable, a secondary battery refers to a battery which is chargeable and dischargeable. The secondary battery is widely used in high-tech electronic fields such as mobile phones, notebook computers, and camcorders.

[0005] In addition, such a secondary battery is classified into a can-type secondary battery in which an electrode assembly is built in a metal can and a pouch-type secondary battery in which an electrode assembly is built in a pouch. The pouch-type secondary battery includes an electrode assembly, an electrolyte, and a pouch which accommodates the electrode assembly and the electrolyte.

[0006] In addition, in the electrode assembly, a cathode and an anode are disposed to have a separator therebetween, a cathode tab is disposed on the cathode, and an anode tab is disposed on the anode. In addition, an electrode lead is bonded to each of the cathode tab and the anode tab.

[0007] In addition, the pouch includes an accommodation portion which accommodates the electrode assembly, a gas collection portion which collects gas generated in the accommodation portion, and a sealing portion which seals the accommodation portion and the gas collection portion.

[0008] However, in the case of the pouch, there is a problem in that, in a forming process for forming the accommodation portion, a curling phenomenon in which a region other than the accommodation portion, that is, a gas pocket portion is rolled or bent due to residual stress occurs. In particular, since interference occurs during a process of manufacturing a secondary battery due to the curling phenomenon occurring in the pouch, there is a problem in that a sealing defect and deterioration of equipment operation occur. SUMMARY

[0009] TECHNICAL PROBLEM

[0010] To address the aforementioned problems, the present invention aims to provide a bag for a secondary battery including a reinforcing portion, a method for manufacturing the same, and a method for manufacturing a secondary battery. The reinforcing portion strengthens the area where the air pocket portion is formed to prevent curling or bending of the area where the air pocket portion is formed, thereby preventing sealing defects and equipment deterioration.

[0011] Technical solution

[0012] To achieve the above objectives, a secondary battery bag according to the present invention comprises a bag side and a bag side formed in the length direction, the bag including: a side receiving groove and a side receiving groove, the side receiving groove and the other side receiving groove being formed in a side surface of a corresponding side of the bag side and a side surface of the bag side, respectively; a side reinforcing portion, the side reinforcing portion being formed on the other side surface of the bag side and configured to enhance strength so that the other side surface of the bag side does not curl up or bend in the direction of the side receiving groove; and a other side reinforcing portion, the other side reinforcing portion being formed on the other side surface of the bag side and configured to enhance strength so that the other side surface of the bag side does not curl up or bend in the direction of the other side receiving groove.

[0013] The one-sided reinforcement may be formed on each side of the other side surface of one side of the bag, and the other-sided reinforcement may be formed on each side of the other side surface of the other side of the bag.

[0014] The two ends of the one-sided reinforcing portion can extend elongatedly in the length direction of the bag to enhance its strength, so that the other side surface of the bag does not roll up or bend in the direction of the one-sided receiving groove.

[0015] When the bag is viewed in the width direction, one end of the side reinforcement on one side of the bag can be configured to overlap the side receiving groove by a set length.

[0016] The two ends of the other side reinforcement can extend elongatedly in the length direction of the bag to enhance strength, so that the other side surface of the bag does not roll up or bend in the direction of the other side receiving groove.

[0017] When the bag is viewed in the width direction, one end of the other side reinforcement on the other side of the bag can be configured to overlap the other side receiving groove by a set length.

[0018] The one-sided reinforcement portion may be formed to protrude in one direction on one side of the bag, and the other-sided reinforcement portion may be formed to protrude in another direction on the other side of the bag, the other direction being opposite to the one-sided reinforcement portion, and when the one side of the bag and the other side of the bag overlap each other, the groove portion of the one-sided reinforcement portion is assembled to engage with the protruding portion of the other-sided reinforcement portion.

[0019] The method for manufacturing a bag for a secondary battery according to the present invention includes: step (a) preparing a bag sheet in which one side of the bag and the other side of the bag are formed corresponding to each other in the length direction; step (b) forming a one-side receiving groove and a other-side receiving groove in a one-side surface of the corresponding one side of the bag and a one-side surface of the other side of the bag, respectively; and step (c) forming a one-side reinforcing portion on the other-side surface of the one side of the bag to enhance strength, such that the other-side surface of the one side of the bag does not roll up or bend in the direction of the one-side receiving groove, and forming another-side reinforcing portion on the other-side surface of the other side of the bag to enhance strength, such that the other-side surface of the other side of the bag does not roll up or bend in the direction of the other-side receiving groove.

[0020] In step (c), the side reinforcement may be formed on each side of the other side surface of the bag side, and the two ends of the side reinforcement extend elongatedly in the length direction of the bag sheet to enhance strength, so that the other side surface of the bag side does not roll up or bend in the direction of the side receiving groove.

[0021] In step (c), the other side reinforcement may be formed on each side of the other side surface of the bag, and the two ends of the other side reinforcement extend elongatedly in the length direction of the bag piece to enhance strength, such that the other side surface of the bag does not roll up or bend in the direction of the other side receiving groove.

[0022] Both process (b) and process (c) can be performed simultaneously.

[0023] In step (c), the reinforcing part on one side or the reinforcing part on the other side can be formed by embossing the other side surface of one side of the bag.

[0024] The method may further include a step (d) after step (c), in which one side of the bag and the other side of the bag are folded to overlap each other to complete the bag.

[0025] In step (c), the one-sided reinforcement may be formed to protrude in one direction of the bag piece, and the other-sided reinforcement may be formed to protrude in another direction of the bag piece, the other direction being opposite to the one-sided reinforcement. Step (d) may include the following steps: bending the bag piece so that the bag side and the bag side are correspondingly arranged; joining the grooved portion of the one-sided reinforcement to the protruding portion of the other-sided reinforcement so that the end of the bag side and the end of the bag side match each other; and folding the boundary line between the bag side and the bag side so that the bag side and the bag side overlap each other.

[0026] On the other hand, the method for manufacturing a secondary battery according to the present invention includes: step (A), manufacturing a bag by said method; step (B), cutting and removing a one-sided reinforcing portion and a other-sided reinforcing portion formed on said bag; step (C), accommodating an electrode assembly between a one-sided receiving groove and a other-sided receiving groove of said bag; and step (D), sealing the edge surface of said bag to complete said secondary battery.

[0027] Beneficial effects

[0028] The pouch for the secondary battery according to the invention may include a reinforcing portion to prevent curling or bending of areas in the pouch other than the area where the receiving groove is formed, thereby preventing sealing defects and deterioration of equipment operation. Attached Figure Description

[0029] Figure 1 This is a perspective view illustrating the unfolded state of the pouch of the secondary battery according to the first embodiment of the present invention.

[0030] Figure 2 yes Figure 1 Side view.

[0031] Figure 3 It is along Figure 1 A cross-sectional view taken from line AA.

[0032] Figure 4 This is a perspective view showing the state of a bag assembled with a secondary battery according to a first embodiment of the present invention.

[0033] Figure 5 yes Figure 4 Side view.

[0034] Figure 6 It is along Figure 5 A cross-sectional view taken from the BB line.

[0035] Figure 7 This is a flowchart illustrating a method for manufacturing a bag for a secondary battery according to a first embodiment of the present invention.

[0036] Figure 8 This is a perspective view illustrating the process of preparing the bag.

[0037] Figure 9 It is a perspective view illustrating the process of forming the receiving groove and the reinforcing part.

[0038] Figure 10 This is a perspective view illustrating the process of folding a bag.

[0039] Figure 11 This is a flowchart illustrating a method for manufacturing a secondary battery according to a second embodiment of the present invention.

[0040] Figure 12 It is a perspective view illustrating the process of manufacturing a bag.

[0041] Figure 13 This is a perspective view illustrating the bag removal process.

[0042] Figure 14 It is a cross-sectional view illustrating the process of accommodating the electrode assembly.

[0043] Figure 15 It is a plan view illustrating the process of making a sealed bag. Detailed Implementation

[0044] Hereinafter, embodiments of the invention will be described in detail with reference to the accompanying drawings in a manner that allows those skilled in the art to readily implement the invention's concept. However, the invention may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. In the drawings, anything unnecessary for describing the invention will be omitted for clarity, and like reference numerals denote like elements.

[0045] [A pouch for a secondary battery according to a first embodiment of the present invention]

[0046] The pouch 100 of the secondary battery according to the first embodiment of the present invention is configured to accommodate, for example, Figures 1 to 6 The electrode assembly shown has a bag side 110 and a bag side 120 in the length direction (in Figure 2 When viewed from the center, the structures are formed corresponding to each other in the left-right direction. In addition, one side 110 and the other side 120 of the bag are integrally connected to each other with respect to the boundary line 130.

[0047] That is to say, such as Figure 4 As shown, the pouch 100 of the secondary battery according to the first embodiment of the present invention has a structure in which one side 110 and the other side 120 of the pouch overlap symmetrically with respect to the boundary line 130.

[0048] Here, on one side surface of the bag side 110 located near the boundary line 130 (in) Figure 2 When observing, the right surface of one side of the bag and the side surface of the other side of the bag (120) are observed. Figure 2 When observed from the left surface of the other side of the bag, a one-sided receiving groove 111 and a other-sided receiving groove 121 are formed respectively. That is, the one-sided receiving groove 111 for accommodating one end of the electrode assembly is formed in one side surface of one side of the bag 110, and the other-sided receiving groove 121 for accommodating the other end of the electrode assembly is formed in one side surface of the other side of the bag 120.

[0049] As an example, refer to Figure 4 It has a structure in which one side 110 and the other side 120 of the bag are arranged in the vertical direction relative to the boundary line 130. Here, the receiving groove 111 on one side and the receiving groove 121 on the other side are connected in the vertical direction to form a receiving portion for receiving the electrode assembly.

[0050] Furthermore, the gas bag region for forming the gas collection bag section is defined on the opposite surface of the bag side 110, which is located away from the boundary line 130 (in Figure 2 When observing, the left surface of one side of the bag and the other surface of the bag (120) are observed. Figure 2 When observing from the right surface of the other side of the bag, each of the items is visible.

[0051] The pouch 100 for the secondary battery is formed by molding one side surface of the pouch side 110 and one side surface of the pouch side 120 to form a one-sided receiving groove 111 and a other-sided receiving groove 121. Here, since the stress generated when forming the receiving grooves still exists in the other side surface of the pouch side 110 and the other side surface of the pouch side 120, there is a problem that curling phenomena such as rolling or bending may occur in the direction of the receiving grooves.

[0052] To solve the above problems, the secondary battery pouch 100 according to the first embodiment of the present invention includes a side reinforcement portion 112 and a side reinforcement portion 122 that strengthen the strength of the other side surface of the pouch side 110 and the other side surface of the pouch other side 120.

[0053] That is, a one-sided reinforcing portion 112 for strengthening is formed on the other side surface of the bag side 110. Therefore, the one-sided reinforcing portion 112 can strengthen the strength so that the other side surface of the bag side 110 does not curl up or bend in the direction of the one-sided receiving groove 111, thereby preventing curling.

[0054] Furthermore, a reinforcement portion 122 for enhancing strength is formed on the other side surface of the other side 120 of the bag. Therefore, the reinforcement portion 122 enhances strength so that the other side surface of the other side 120 of the bag does not curl up or bend in the direction of the other side receiving groove 121, thereby preventing curling.

[0055] One side reinforcement 112 can Figure 1 The reinforcement portion 122 shown is symmetrically formed on both sides of the other side surface of the bag side 110 in the y-axis direction, thus preventing curling on both sides of the other side surface of the bag side 110. Furthermore, the other side reinforcement portion 122 can... Figure 1 The reinforcement portions 112 and 122 are symmetrically formed on both sides of the other side surface of the bag 120 in the y-axis direction, thus preventing curling on both sides of the other side surface of the bag 120. That is, the one-side reinforcement portion 112 and the other-side reinforcement portion 122 can keep the other side surface of the bag on one side and the other side surface of the bag on the other side flat.

[0056] The two ends of the one-sided reinforcing part 112 and the other-sided reinforcing part 122 can extend elongatedly in the length direction of the bag 100, thus effectively preventing curling phenomena in which the other side surface of the bag one side 110 and the other side surface of the bag other side roll up or bend in the direction of the receiving groove.

[0057] In other words, the reinforcing part 112 on one side and the reinforcing part 122 on the other side can be formed in a straight line along the length of the bag.

[0058] One-sided reinforcement and the other-sided reinforcement can be formed by embossing each surface of one side and the other side of the bag.

[0059] When observing the bag in the width direction (in) Figure 1 (As shown in the y-direction view), one end of the side reinforcement 112 extends in a straight line to overlap with the side receiving groove 111 by a set length, and the other end extends to match one end of the other side surface of the bag. Therefore, the strength between the one side surface and the other side surface of the bag can be strengthened, and as a result, curling between the one side surface and the other side surface of the bag can be prevented.

[0060] When observing the bag in the width direction (in) Figure 1 (As shown in the y-direction view), one end of the reinforcing portion 122 extends in a straight line to overlap the receiving groove 121 on the other side by a set length, and the other end extends to match one end of the other side surface of the bag. Therefore, the strength between one side surface and the other side surface of the bag can be strengthened, and as a result, curling between one side surface and the other side surface of the bag can be prevented.

[0061] Even if one side of the bag is formed to mold a receiving groove on one side and a receiving groove on the other side, the bag 100 of the secondary battery according to the first embodiment of the present invention, having the above structure, can also prevent curling on the other side of the bag.

[0062] In the pouch 100 of the secondary battery according to the first embodiment of the present invention, a side reinforcement 112 is formed in one direction of the pouch 100 (in... Figure 1 When viewed from the inside, the reinforcement 122 protrudes in the direction of the bottom surface of the bag, and the other side reinforcement 122 can be formed in the other direction of the bag 100 (in the direction of the bottom surface of the bag). Figure 1 When viewed from the inside, the direction of the top surface of the bag is protruding, and the other direction is opposite to that of the side reinforcement. Therefore, when one side 110 and the other side 120 of the bag overlap each other, the side receiving groove 111 of one side 110 and the other side receiving groove 121 of the other side 120 of the bag connect with each other to form an electrode assembly receiving portion. In particular, the groove portion of the side reinforcement 112 of one side 110 (in the direction of the top surface of the bag) Figure 6 When viewed from the inside, the bottom surface portion of one side of the reinforcing part can be assembled and joined to the protruding portion of the other side of the reinforcing part 122 on the other side of the bag 120 (in Figure 6 (When viewed from the center, the top surface portion of the reinforcing part on the other side). Therefore, one side 110 and the other side 120 of the bag can be folded to overlap each other without the need for separate equipment.

[0063] The following describes a method for manufacturing a bag for a secondary battery according to a first embodiment of the present invention.

[0064] [Method for manufacturing a bag for a secondary battery according to a first embodiment of the present invention]

[0065] like Figures 7 to 10 As shown, the method for manufacturing a bag for a secondary battery according to the first embodiment of the present invention includes: a step of preparing a bag sheet (a); a step of forming a receiving groove (b); and a step of forming a reinforcing portion (c).

[0066] In step (a) of preparing the bag sheet, a bag sheet 100a is prepared in which one side 110 and the other side 120 of the bag are corresponding to each other in the length direction. That is, referring to... Figure 8 In bag 100a, one side 110 of the bag is located on the left side relative to the center boundary line 130, and the other side 120 of the bag is located on the right side relative to the center boundary line 130.

[0067] In step (b) of forming the receiving groove, one side surface of the corresponding bag side 110 (in) Figure 9 When observing, the surface on the left side near the boundary line 130 and the other side of the bag 120 (in) Figure 9When viewed from the center, the right side near the boundary line 130 is formed to create a one-sided receiving groove 111 and a other-sided receiving groove 121. That is, the one-sided receiving groove 111 is formed in one side surface of the bag side 110, while the other-sided receiving groove 121 is formed in one side surface of the bag side 120.

[0068] In process (c) of forming the reinforcing part, one side reinforcing part 112 and the other side reinforcing part 122 are respectively formed on the other side surface of one side 110 of the bag (in Figure 9 When observing, the left surface of one side of the bag and the other surface of the bag (120) are observed. Figure 9 When observing from the middle, on the right surface of the other side of the bag.

[0069] That is, one side reinforcement 112 is formed on the other side surface of one side 110 of the bag, and the other side reinforcement 122 is formed on the other side surface of the other side 120 of the bag.

[0070] Therefore, the one-sided reinforcing part 112 and the other-sided reinforcing part 122 can strengthen the strength of the other side surface of the bag side 110 and the other side surface of the bag side 120, thus preventing the curling phenomenon of the other side surface of the bag side 110 and the other side surface of the bag side 120 rolling up or bending in the direction of the one-sided receiving groove 111 and the other-sided receiving groove 121.

[0071] In step (c), a side reinforcement 112 may be symmetrically formed on both sides of the other side surface of the bag side 110. Here, the two ends of the side reinforcement 112 may extend elongatedly in the length direction of the bag piece 100a to significantly enhance the strength, so that the other side surface of the bag side 110 will not roll up or bend in the direction of the side receiving groove 111.

[0072] In process (c), when viewed from the side (i.e., in...) Figure 1 When viewed in the y-direction as shown, one end of the side reinforcement 112 extends in a straight line to partially overlap with the side receiving groove 111, and the other end extends in a straight line to one end of the bag side. Therefore, the strength between one side surface and the other side surface of the bag side can be strengthened.

[0073] Furthermore, in process (c), the other side reinforcement 122 may be symmetrically formed on both sides of the other side surface of the other side 120 of the bag. Here, the two ends of the other side reinforcement 122 may extend elongatedly in the length direction of the bag piece 100a to significantly enhance the strength, so that the other side surface of the other side 120 of the bag will not roll up or bend in the direction of the other side receiving groove 121.

[0074] When viewing the other side of the bag from the side (i.e., when in...) Figure 1When viewed in the y-direction as shown, one end of the reinforcing portion 122 extends in a straight line to partially overlap with the receiving groove 121 on the other side, and the other end extends in a straight line to one end of the bag on the other side. Therefore, the strength between one side surface and the other side surface of the bag can be significantly enhanced.

[0075] In particular, steps (b) and (c) can be performed simultaneously. That is, one side surface of bag side 110 and one side surface of bag side 120 are formed to create a one-sided receiving groove 111 and a other-sided receiving groove 121. At the same time, a one-sided reinforcing portion 112 and a other-sided reinforcing portion 122 are formed on the other side surface of bag side 110 and bag side 120. Therefore, it is possible to prevent the other side surface of the bag from rolling up or bending when the receiving groove is formed in one side surface of the bag.

[0076] In process (c), the ease of operation can be improved by embossing the other side surface of one side 110 or the other side surface of the other side 120 of the bag to form a one-sided reinforcement 112 or a other-sided reinforcement 122.

[0077] One side reinforcement 112 may be formed to protrude in one direction of the bag piece 100a, while the other side reinforcement 122 may be formed to protrude in another direction of the bag piece, the opposite direction to that of the one side reinforcement. That is, the one side reinforcement 112 and the other side reinforcement 122 are formed to protrude in opposite directions. Here, the one side reinforcement 112 and the other side reinforcement 122, which protrude in opposite directions, can be assembled together when one side of the bag and the other side of the bag overlap, thereby improving the bonding strength between the one side of the bag and the other side of the bag.

[0078] After step (c), the folding bag process (d) is performed.

[0079] In step (d), one side 110 and the other side 120 of the bag are folded relative to the boundary line 130 to overlap each other, thereby completing the bag 100.

[0080] That is, process (d) includes the following steps: bending the bag piece 100a so that one side 110 and the other side 120 of the bag are arranged correspondingly to each other; joining the recessed portion of one side reinforcement 112 (i.e., the space in the bottom surface of one side reinforcement) to the protruding portion of the other side reinforcement 122 (i.e., the protruding surface of the top surface of the other side reinforcement) so that the end of one side 110 and the end of the other side 120 of the bag match each other; and folding one side 110 and the other side 120 of the bag relative to the boundary line 130 between one side 110 and the other side 120 of the bag so that one side 110 and the other side 120 of the bag overlap each other.

[0081] Therefore, the receiving groove on one side and the receiving groove on the other side are overlapped on one side of the bag to form a receiving part, and the other side surface on one side of the bag and the other side surface on the other side of the bag are overlapped on the other side of the bag to form an air bag part.

[0082] When the above steps are completed, the bag 100 for the secondary battery of this application can be manufactured.

[0083] In the following description of another embodiment of the present invention, configurations having the same function as those in the above embodiments are given the same reference numerals in the drawings, and therefore repeated descriptions will be omitted.

[0084] [Method for manufacturing a secondary battery according to a second embodiment of the present invention]

[0085] like Figures 11 to 15 As shown, the method for manufacturing a secondary battery according to the second embodiment of the present invention includes: a step of manufacturing a bag (A); a step of removing the reinforcing portion (B); a step of accommodating an electrode assembly (C); and a step of sealing the bag (D).

[0086] In process (A), refer to Figure 12 A bag 100 is manufactured in which a bag side 110 and a bag side 120 are formed relative to the boundary line 130.

[0087] The method for manufacturing the bag is the same as the method for manufacturing the bag according to the first embodiment described above, so a repeated description will be omitted.

[0088] In process (B), the reinforcing portion 112 on one side and the reinforcing portion 122 on the other side formed on the bag 100 are cut and removed. That is, along... Figure 12 The dashed lines shown in the diagram indicate that the bag can be cut. As a result, one side reinforcement 112 and the other side reinforcement 122 can be removed from the bag. The bag can be transformed into a region for forming a receiving portion for accommodating an electrode assembly by connecting one side receiving groove on one side of the bag to another side receiving groove on the other side of the bag, and the bag can be transformed into a region for forming an air bag portion by connecting the other side surface on one side of the bag to the other side surface on the other side of the bag.

[0089] In process (C), the electrode assembly 200 is housed between a receiving groove 111 on one side of the bag and a receiving groove 121 on the other side.

[0090] Processes (B) and (C) can be performed in reverse order. That is, the electrode assembly can be accommodated between the receiving grooves on one side and the receiving grooves on the other side of the bag, and then the reinforcing portions formed in the bag on one side and the other side can be cut and removed.

[0091] In process (D), refer to Figure 15The bag 100 is sealed to form a sealing portion 140. That is, the sealing portion 140 seals the edge surface of the bag 100 to form a first sealing portion 141, and at the same time, the sealing portion 140 seals the space between the area for forming the receiving portion and the area for forming the air bag portion to form a second sealing portion 142. As a result, a receiving portion 100b is formed on one side of the bag 100, and an air bag portion 100c is formed on the other side of the bag 100, thus completing the secondary battery according to the invention.

[0092] Therefore, the scope of this invention is defined by the appended claims, rather than by the foregoing description and the exemplary embodiments described therein. Various modifications made within the equivalent meaning of the claims and within the scope of the claims should be considered within the scope of this invention.

[0093] [Label Explanation]

[0094] 100: bag

[0095] 110: One side of the bag

[0096] 111: One-sided receiving groove

[0097] 112: One-sided reinforcement

[0098] 120: The other side of the bag

[0099] 121: The other side receiving slot

[0100] 122: Reinforcing section on the other side

[0101] 130: Boundary line.

Claims

1. A bag for a secondary battery, wherein one side of the bag and another side of the bag are formed in the longitudinal direction, the bag comprising: A one-sided receiving groove and a other-sided receiving groove are respectively formed in a side surface of one side of the bag and a side surface of the other side of the bag; A side reinforcement is formed on the other side surface of one side of the bag and configured to enhance strength so that the other side surface of one side of the bag does not roll up or bend in the direction of the side receiving groove. as well as The other side reinforcement is formed on the other side surface of the bag and configured to enhance strength, so that the other side surface of the bag does not curl up or bend in the direction of the other side receiving groove. The one-sided reinforcing portion is formed to protrude in one direction on one side of the bag, and the other-sided reinforcing portion is formed to protrude in another direction on the other side of the bag, the other direction being opposite to that of the one-sided reinforcing portion. When one side of the bag and the other side of the bag overlap each other, the groove portion of the reinforcing part on one side is assembled to the protruding portion of the reinforcing part on the other side.

2. The bag according to claim 1, wherein the one-sided reinforcement is formed on each side of the other side surface of one side of the bag, and The other side reinforcement is formed on each side of the other side surface of the bag.

3. The bag according to claim 2, wherein the two ends of the side reinforcement extend elongatedly in the length direction of the bag to enhance strength, such that the other side surface of the bag does not roll up or bend in the direction of the side receiving groove.

4. The bag according to claim 3, wherein when the bag is viewed in the width direction, one end of the side reinforcement on one side of the bag is configured to overlap the side receiving groove by a predetermined length.

5. The bag according to claim 2, wherein the two ends of the other side reinforcement extend elongatedly in the length direction of the bag to enhance strength, such that the other side surface of the other side of the bag does not roll up or bend in the direction of the other side receiving groove.

6. The bag according to claim 5, wherein, When the bag is viewed in the width direction, one end of the other side reinforcement on the other side of the bag is configured to overlap the other side receiving groove by a set length.

7. A method for manufacturing a bag for a secondary battery, the method comprising: Step (a) involves preparing a bag sheet in which one side of the bag and the other side of the bag are formed corresponding to each other in the length direction; Step (b) involves forming a one-sided receiving groove and a other-sided receiving groove on one side surface of one side of the bag and one side surface of the other side of the bag, respectively. as well as Step (c) involves forming a side reinforcement on the opposite surface of one side of the bag to enhance strength, ensuring that the opposite surface of one side of the bag does not curl up or bend in the direction of the side receiving groove, and forming another side reinforcement on the opposite surface of the other side of the bag to enhance strength, ensuring that the other surface of the other side of the bag does not curl up or bend in the direction of the other side receiving groove. In step (c), the reinforcing portion on one side or the reinforcing portion on the other side of the bag is formed by embossing. The reinforcing portion on one side protrudes in one direction of the bag piece, and the reinforcing portion on the other side protrudes in another direction of the bag piece, the other direction being opposite to that of the reinforcing portion on one side. The process further includes step (d) after step (c), which involves folding one side of the bag and the other side of the bag to overlap each other to complete the bag. Step (d) includes the following steps: bending the bag piece so that one side of the bag and the other side of the bag are positioned correspondingly to each other; joining the grooved portion of the reinforcing portion on one side to the protruding portion of the reinforcing portion on the other side so that the end of one side of the bag and the end of the other side of the bag match each other; and folding the boundary line between one side of the bag and the other side of the bag so that one side of the bag and the other side of the bag overlap each other.

8. The method according to claim 7, wherein, In step (c), the one-sided reinforcement is formed on each side of the other side surface of the bag side, and the two ends of the one-sided reinforcement extend elongatedly in the length direction of the bag sheet to enhance strength, so that the other side surface of the bag side does not roll up or bend in the direction of the one-sided receiving groove.

9. The method according to claim 7, wherein, In step (c), the other side reinforcement is formed on each side of the other side surface of the bag, and the two ends of the other side reinforcement extend elongatedly in the length direction of the bag piece to enhance strength, so that the other side surface of the bag does not roll up or bend in the direction of the other side receiving groove.

10. The method of claim 7, wherein step (b) and step (c) are performed simultaneously.

11. A method for manufacturing a secondary battery, the method comprising: Step (A) involves manufacturing a bag by the method described in claim 7; Step (B): Cut and remove the reinforcing portions on one side and the other side formed on the bag; Step (C) involves accommodating the electrode assembly between a receiving groove on one side and a receiving groove on the other side of the bag; and Step (D) involves sealing the edge surface of the bag to complete the secondary battery.

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