Secondary batteries, their manufacturing methods, and battery packs

Abstract

This invention provides a secondary battery, comprising: an electrode assembly to which electrode leads are bonded; a pouch configured to house the electrode assembly and having a sealing portion; and a lead film configured to seal the portion between the sealing portion and the electrode leads. A patterned layer is provided on the bonded portion between the sealing portion and the lead film, the patterned layer being configured to pattern the sealing portion and the lead film to increase the bonding area between the sealing portion and the lead film. Therefore, the adhesive force and sealing force between the lead film and the sealing portion can be increased.

Description

[0001] Cross-reference to related applications

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2021-0016401, filed on February 4, 2021, and Korean Patent Application No. 10-2022-0010697, filed on January 25, 2022, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This invention relates to a secondary battery, a method for manufacturing a secondary battery, and a battery pack, and more specifically, to a secondary battery, a method for manufacturing a secondary battery, and a battery pack wherein the adhesive force between the lead film and the bag is improved. Background Technology

[0004] Generally, unlike non-rechargeable primary batteries, secondary batteries refer to batteries that can be both recharged and discharged. These secondary batteries are widely used in mobile phones, laptops, cameras, electric vehicles, and more.

[0005] Such secondary batteries are divided into can-type secondary batteries in which the electrode assembly is built into a metal can, and bag-type secondary batteries in which the electrode assembly is built into a bag. The can-type secondary battery includes an electrode assembly in which electrodes and separators are alternately stacked, a can containing the electrode assembly, and a cap assembly installed in the opening of the can. The bag-type secondary battery includes an electrode assembly in which electrodes and separators are alternately stacked, a bag containing the electrode assembly, and electrode leads connected to the electrode assembly and extending from the bag.

[0006] In a pouch-type secondary battery, a lead film is disposed between the pouch's sealing portion and the electrode leads, and the lead film increases the adhesion and sealing force between the pouch's sealing portion and the electrode leads.

[0007] However, according to related technologies, pouch-type secondary batteries suffer from air leakage between the lead film and the pouch seal when internal pressure increases. Therefore, it is necessary to increase the adhesion and sealing force between the lead film and the pouch seal. Summary of the Invention

[0008] Technical issues

[0009] The purpose of this invention is to provide a secondary battery, a method for manufacturing a secondary battery, and a battery pack, wherein the adhesive portion between the lead film and the sealing portion of the bag is patterned to maximize the contact area between the lead film and the sealing portion of the bag, thereby increasing the adhesive force and sealing force between the lead film and the sealing portion of the bag.

[0010] Technical solution

[0011] A secondary battery according to the present invention for achieving the above-mentioned objectives comprises: an electrode assembly to which electrode leads are bonded; a bag including a receiving portion and a sealing portion, the receiving portion being configured to receive the electrode assembly when the front end of the electrode lead is pulled out to the outside of the bag, the sealing portion being configured to seal the receiving portion; and a lead film disposed on the electrode lead, the electrode lead being disposed on the sealing portion of the bag, and the lead film being bonded to the sealing portion to seal the portion between the sealing portion and the electrode lead, wherein a patterned layer is disposed on the adhesive portion between the sealing portion and the lead film, the patterned layer... The sealing portion and the lead film are configured to be patterned to increase the bonding area between the sealing portion and the lead film. The patterned layer includes a lead pattern layer disposed on the surface of the lead film and a sealing pattern layer disposed on the surface of the sealing portion and bonded to contact the surface of the lead pattern layer. The lead pattern layer includes lead recesses and lead protrusions formed to extend in the width direction of the electrode lead. The sealing pattern layer includes sealing recesses and sealing protrusions formed to extend in the width direction of the electrode lead and bonded to contact the surfaces of the lead recesses and lead protrusions.

[0012] The lead wire recess and lead wire protrusion can be formed alternately along the length of the electrode lead, and the sealing recess and the sealing protrusion can be formed alternately along the length of the electrode lead.

[0013] When a lead film is used as a reference plane, the width of the lead protrusions alternately formed along the length of the electrode lead can be greater than the width of the lead recess; when a lead film is used as a reference plane, the width of the sealing protrusions alternately formed along the length of the electrode lead can be less than the width of the sealing recess, and the sealing protrusions and lead recesses can be bonded together to make surface contact with each other.

[0014] The lead pattern layer and the sealing pattern layer can be formed only on the surface of the lead film and the sealing portion, and the surface of the lead film and the sealing portion is provided with the surface of the electrode lead.

[0015] The sealing part may have a structure in which a resin layer, a metal layer and an insulating layer are stacked in sequence, and in the sealing pattern layer, the entire resin layer, metal layer and insulating layer may be patterned into sealing recesses and sealing convexities.

[0016] The sealing portion may have a structure in which a resin layer, a metal layer and an insulating layer are stacked in sequence, and in the sealing pattern layer, only the resin layer bonded to the lead film may be patterned into sealing recesses and sealing protrusions.

[0017] The lead protrusions and lead recesses that are alternately formed along the length of the electrode lead can have a wavy shape, and the sealing protrusions and sealing recesses that are alternately formed along the length of the electrode lead can also have a wavy shape.

[0018] The lead pattern layer can be configured to be attached to the surface of the lead film, and the sealing pattern layer can be configured to be attached to the surface of the sealing portion corresponding to the lead pattern layer.

[0019] Each of the lead pattern layer and the sealing pattern layer can be made of the same material as the lead film.

[0020] The method for manufacturing a secondary battery according to the present invention includes: a preparation step of preparing an electrode assembly and a bag, wherein electrode leads are bonded to the electrode assembly, and the bag includes a receiving portion and a sealing portion; a receiving step of receiving the electrode assembly into the bag with the front end of the electrode lead extended to the outside of the bag; an attachment step of attaching a lead film to the electrode lead disposed on the sealing portion of the bag; a patterning step of compressing the surface of the lead film to form a lead pattern layer, and patterning lead recesses and lead protrusions on the lead pattern layer; and a sealing step of heat-melting the sealing portion of the bag to seal the receiving portion, wherein a sealing pattern layer is formed on the sealing portion of the bag where the lead pattern layer is disposed, and on the sealing pattern layer, the sealing recesses and sealing protrusions are patterned to contact the surface of the lead pattern layer, thereby increasing the bonding area between the sealing portion and the lead film, wherein in the patterning step, the lead recesses and lead protrusions are formed to extend in the width direction of the electrode lead, and in the sealing step, the sealing recesses and sealing protrusions are formed to extend in the width direction of the electrode lead.

[0021] In the patterning process, lead recesses and lead protrusions can be formed alternately along the length of the electrode lead, and in the sealing process, sealing recesses and sealing protrusions can be formed alternately along the length of the electrode lead.

[0022] In the patterning process, the lead protrusions and lead recesses formed alternately along the length of the electrode leads can have a wavy shape, and in the sealing process, the sealing protrusions and sealing recesses formed alternately along the length of the electrode leads can have a wavy shape.

[0023] In the sealing process, when the sealing part with the lead pattern layer thereon is heat-fused, a portion of the sealing part can be inserted into the lead recess of the lead pattern layer to form a sealing protrusion, and the lead protrusion of the lead pattern layer causes the remaining portion of the sealing part to be recessed to form a sealing recess.

[0024] Beneficial effects

[0025] In the secondary battery according to the present invention, the adhesive portion between the lead film and the sealing portion of the bag can be patterned to increase the contact area between the lead film and the sealing portion of the bag. Therefore, the adhesive force and sealing force between the lead film and the sealing portion of the bag can be increased to prevent air leakage. Attached Figure Description

[0026] Figure 1 This is a perspective view of a secondary battery according to a first embodiment of the present invention.

[0027] Figure 2 This is a plan view of a secondary battery according to the first embodiment of the present invention.

[0028] Figure 3 yes Figure 2 An enlarged view of part "A" shown in the image.

[0029] Figure 4 It is along Figure 2 The cross-sectional view of line BB.

[0030] Figure 5 yes Figure 4 A magnified view of a portion of the image.

[0031] Figure 6 This is a flowchart illustrating a method for manufacturing a second battery according to a first embodiment of the present invention.

[0032] Figure 7 This is a perspective view showing the preparation process, the containment process, the attachment process, and the patterning process in a method for manufacturing a secondary battery according to a first embodiment of the present invention.

[0033] Figure 8 This is a cross-sectional view showing the sealing process in a method for manufacturing a secondary battery according to a first embodiment of the present invention.

[0034] Figure 9 This is a cross-sectional view of a secondary battery according to a second embodiment of the present invention.

[0035] Figure 10 This is a schematic front view of a battery pack according to a third embodiment of the present invention.

[0036] Figure 11 This is a perspective view showing a secondary battery according to a fourth embodiment of the present invention. Detailed Implementation

[0037] In the following description, embodiments of the invention will be detailed with reference to the accompanying drawings in a manner that allows those skilled in the art to readily implement the inventive 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, for clarity, any content unnecessary for describing the invention will be omitted, and the same reference numerals denote the same elements.

[0038] [A secondary battery according to a first embodiment of the present invention]

[0039] like Figures 1 to 5 As shown, a secondary battery 100 according to a first embodiment of the present invention includes: an electrode assembly 110, to which electrode leads 111 are bonded; a pouch 120 for housing the electrode assembly 110; and a lead film 130 configured to increase the sealing force between the pouch 120 and the electrode leads 111.

[0040] Electrode assembly

[0041] The electrode assembly has a structure in which diaphragms and electrodes are stacked alternately, and each electrode includes an electrode tab. Electrode leads 111 are bonded to the electrode tabs.

[0042] The electrode includes a positive electrode and a negative electrode, and the electrode contacts include a positive electrode contact disposed on the positive electrode and a negative electrode contact disposed on the negative electrode. In addition, the electrode lead 111 includes a positive electrode lead bonded to the positive electrode contact and a negative electrode lead bonded to the negative electrode contact.

[0043] bag

[0044] Bag 120 has a structure in which the upper shell and the lower shell are bonded to each other to correspond to each other, or in which the lower shell and the cover are bonded to each other. Embodiments of the invention will be described based on the structure in which the lower shell and the cover are bonded to each other.

[0045] Here, a receiving portion 121 for accommodating the electrode assembly is formed at the center of the bag 120, and a sealing portion 122 for sealing the receiving portion 121 is formed on the edge of the receiving portion 121.

[0046] That is, the bag 120 includes a receiving portion 121 and a sealing portion 122. The receiving portion 121 receives the electrode assembly 110 when the front end of the electrode lead 111 is pulled out to the outside. The sealing portion 122 is formed along the edge surface of the receiving portion 121 to seal the receiving portion 121.

[0047] Lead film

[0048] A lead film 130 is disposed on the electrode lead 111, which is disposed on the sealing portion 122 of the bag 120. Specifically, the lead film 130 is attached to surround the circumference of the electrode lead 111. Therefore, the lead film 130 seals the portion between the sealing portion 122 and the electrode lead 111 while being adhered to the sealing portion 122.

[0049] The problem with the secondary battery 100 according to the relevant technology is that when the pressure inside the bag increases, the gap between the lead membrane and the bag's seal leaks air first.

[0050] To solve this problem, the secondary battery according to the first embodiment of the present invention can have a structure that increases the adhesive area between the lead film and the sealing portion of the bag, thereby increasing the adhesive force and sealing force between the lead film and the sealing portion to prevent air leakage.

[0051] That is, in the secondary battery 100 according to the first embodiment of the present invention, the adhesive portion between the lead film 130 and the sealing portion 122 of the pouch 120 can be patterned to increase the adhesive area between the lead film 130 and the sealing portion 122. As a result, the adhesive force and sealing force between the lead film 130 and the sealing portion 122 can be increased to prevent air leakage between the lead film 130 and the sealing portion 122 of the pouch 120.

[0052] For example, in the secondary battery 100 according to the first embodiment of the present invention, a patterned layer 140 is provided in the adhesive portion between the sealing portion 122 and the lead film 130 (i.e., the sealing portion between the sealing portion 122 and the lead film), which increases the adhesive area between the sealing portion 122 and the lead film 130 by patterning the sealing portion 122 and the lead film 130.

[0053] The patterned layer 140 includes a layer disposed on the surface of the lead film 130 (when in...). Figure 3 When observed, the lead pattern layer 141 on the top and bottom surfaces of the lead film and the surface of the sealing portion 122 (when viewed from the inside) are visible. Figure 4 When observed, the sealing pattern layer 142 is on the surface of the sealing part that is in close contact with the lead pattern layer 141 so as to be in close contact with the lead pattern layer 141.

[0054] Here, the lead pattern layer 141 includes the lead pattern layer in the width direction of the electrode lead 111 (when in...). Figure 3The lead wire recess 141a and lead wire protrusion 141b extend in the left-right direction (as observed in the center). Additionally, the sealing pattern layer 142 includes a sealing recess 142a and a sealing protrusion 142b, which extend in the width direction of the electrode lead 111 and are bonded to contact the surfaces of the lead wire recess 141a and the lead wire protrusion 141b, respectively. That is, the lead wire recess 141a and the sealing protrusion 142b are bonded to surface contact with each other, and the lead wire protrusion 141b and the sealing recess 142a are bonded to surface contact with each other. Therefore, the adhesion and sealing force between the lead film and the sealing portion can be increased.

[0055] Specifically, lead recesses 141a and lead protrusions 141b are formed alternately along the length of the electrode lead, and sealing recesses 142a and sealing protrusions 142b are formed alternately along the length of the electrode lead. Therefore, the lead film and sealing portion can be sealed in multiple stages.

[0056] Furthermore, the lead recesses 141a and lead protrusions 141b, which are alternately formed along the length of the electrode lead 111, have a wavy shape, and the sealing recesses 142a and sealing protrusions 142b, which are alternately formed along the length of the electrode lead, also have a wavy shape. Due to this structure, the adhesion and sealing force between the lead pattern layer and the sealing pattern layer can be increased.

[0057] In the patterned layer 140 having the above structure, the lead pattern layer 141 formed on the surface of the lead film 130 and the sealing pattern layer 142 formed on the surface of the sealing portion 122 can be bonded together to make surface contact with each other, thereby increasing the bonding area between the lead film 130 and the sealing portion 122. Therefore, the adhesive force and sealing force between the lead film 130 and the sealing portion 122 can be significantly increased to prevent air leakage.

[0058] The recesses and protrusions of the lead pattern layer 141 and the sealing pattern layer 142 can be within the length of the electrode lead 111 (when in Figure 3 The pressure generated inside the bag 120 during multiple stages can be blocked to significantly prevent air leakage. (The pressure is formed alternately in the vertical direction when observed in the middle.)

[0059] The lead pattern layer 141 and the sealing pattern layer 142 are formed only on the surfaces of the lead film 130 and the sealing portion 122, while the surface of the electrode lead 111 is disposed on the surfaces of the lead film 130 and the sealing portion 122. That is, as the thickness increases, the electrode lead 111 can weaken the adhesive force between the sealing portion 122 of the bag and the lead film 130. Therefore, the lead pattern layer 141 and the sealing pattern layer 142 can be formed only on the sealing portion 122 of the bag and the lead film 130, where the adhesive force is weakened to prevent air leakage and simplify the process.

[0060] The sealing portion 122 has a structure in which a resin layer 122a, a metal layer 122b, and an insulating layer 122c are stacked in sequence. Here, the sealing pattern layer 142 has a structure in which the resin layer 122a, the metal layer 122b, and the insulating layer 122c are patterned as a sealing recess 142a and a sealing protrusion 142b.

[0061] Reference Figure 4 When the surface of the lead film 130 is used as the reference plane α, in the length direction of the electrode lead 111 (when in Figure 5 When observed, the width of the lead protrusions 141b, which are alternately formed in the left-right direction of the lead protrusions, is greater than the width of the lead recesses 141a. For example, the lead protrusions 141b provided on the reference plane α have a width of 0.8 mm, and the lead recesses 141a provided on the reference plane α have a width of 0.4 mm, which is smaller than the width of the guide protrusions 141b. In addition, the lead protrusions 141b protruding relative to the reference plane α have a height of 40 μm, and the lead recesses 141a recessed relative to the reference plane α have a height of 20 μm, which is smaller than the height of the lead protrusions 141b.

[0062] Furthermore, when the surface of the lead film 130 is used as the reference plane β, the width of the sealing protrusions 142b alternately formed along the length of the electrode lead 111 is smaller than the width of the sealing recesses 142a. For example, the sealing protrusions 142b provided on the reference plane β have a width of 0.4 mm, and the sealing recesses 142a provided on the reference plane β have a width of 0.8 mm. Additionally, the sealing protrusions 142b protruding relative to the reference plane β have a height of 20 μm, and the sealing recesses 142a recessed relative to the reference plane β have a depth of 40 μm.

[0063] Therefore, the sealing protrusion 142b and the lead recess 141a are bonded together to make surface contact with each other, and the sealing recess 142a and the lead protrusion 141b are bonded together to make surface contact with each other.

[0064] Therefore, the secondary battery 100 according to the first embodiment of the present invention may include a patterned layer 140 for patterning the adhesive portion between the lead film and the sealing portion. As a result, the adhesive area between the sealing portion 122 and the lead film 130 can be increased to prevent air leakage between the sealing portion 122 and the lead film 130.

[0065] The following describes a method for manufacturing a secondary battery according to a first embodiment of the present invention.

[0066] [Method for manufacturing a secondary battery according to a first embodiment of the present invention]

[0067] A method for manufacturing a secondary battery according to a first embodiment of the present invention includes a preparation step, a containment step, an attachment step, a patterning step, and a sealing step, such as Figures 6 to 8 As shown.

[0068] Preparation process

[0069] Reference Figure 7 In the preparation process, electrode assembly 110 and bag 120 are prepared, electrode lead 111 is bonded to electrode assembly 110, and bag 120 is provided with receiving part 121 and sealing part 122.

[0070] The electrode assembly 110 has a structure in which diaphragms and electrodes are stacked alternately, each electrode includes an electrode tab, and electrode leads 111 are bonded to the electrode tabs.

[0071] The bag 120 includes a receiving portion 121 at the center of the bag 120 for receiving an electrode assembly and a sealing portion 122 formed along the edge of the receiving portion 121 to seal the receiving portion 121.

[0072] Containment process

[0073] Reference Figure 7 During the receiving process, the electrode assembly 110 is received in the receiving part 121 of the bag 120 with the front end of the electrode lead 111 pulled out to the outside of the bag 120.

[0074] Attachment process

[0075] Reference Figure 7 In the attachment process, the lead film 130 is attached to the surface of the electrode lead 111 provided on the sealing portion 122 of the bag 120. In this case, the lead film 130 is attached around the circumference of the electrode lead 111.

[0076] Patterning process

[0077] Reference Figure 7 In the patterning process, a pressing device with concave grooves and concave protrusions is used to press the surface of the lead film 130 attached to the electrode lead 111. Then, a lead pattern layer 141 is formed on the surface of the lead film 130, and lead pattern layer 141 is patterned with lead recesses 141a and lead protrusions 141b. That is, lead recesses 141a are formed on the surface of the lead film 130 where the concave protrusions are provided, and lead protrusions 141b are formed on the surface of the lead film 130 where the concave grooves are provided.

[0078] Here, in the patterning process, the lead recess 141a and lead protrusion 141b are formed to extend in the width direction of the electrode lead. Furthermore, the lead recess 141a and lead protrusion 141b are patterned to be alternately formed in the length direction of the electrode lead 111. Specifically, each of the lead recess 141a and lead protrusion 141b forming the lead pattern layer 141 has a wavy shape.

[0079] In the patterning process, lead pattern layer 141 forms lead recesses 141a at both ends to increase adhesion.

[0080] In the patterning process, the lead pattern layer 141 is formed only on the surface of the lead film, and the surface of the electrode lead is disposed on the surface of the lead film. This enhances adhesion by forming the lead pattern layer only on the surface of the lead film corresponding to the surface of the electrode lead, since the adhesion of the portion of the lead film where the electrode lead is disposed is weaker.

[0081] Sealing process

[0082] In the sealing process, the sealing portion 122 of the bag 120 is thermally fused to seal the receiving portion 121. Here, the supporting force of the lead pattern layer 141 causes the sealing portion 122 of the bag 120 on which the lead pattern layer 141 is provided to deform to form a sealing pattern layer 142 on which sealing recesses 142a and sealing protrusions 142b are patterned.

[0083] In other words, a sealing protrusion is formed on the surface of the sealing portion where the lead protrusion is provided, and a sealing recess is formed on the surface of the sealing portion where the lead protrusion is provided. Therefore, the adhesive area between the sealing portion 122 and the lead film 130 can be increased.

[0084] The sealing portion 122 of the bag 120 on which the lead wire film 130 is provided can be compressed using a pressing device 10 having concave grooves 12 and concave protrusions 11 formed thereon. Therefore, a sealing pattern layer 142 can be formed, wherein the sealing recesses and sealing protrusions in contact with the surface of the lead wire pattern layer 141 are patterned.

[0085] In other words, during the sealing process, when the sealing part with the lead pattern layer is thermally fused, a portion of the sealing part is inserted into the lead recess of the lead pattern layer to form a sealing protrusion 142b, and the lead protrusion of the lead pattern layer causes the remaining portion of the sealing part to be recessed to form a sealing recess 142a.

[0086] In the sealing process, the sealing recess 142a and the sealing protrusion 142b are formed to extend in the width direction of the electrode lead 111, and the sealing recess 142a and the sealing protrusion 142b are alternately formed in the length direction of the electrode lead 111.

[0087] In particular, during the sealing process, each of the sealing protrusions and sealing recesses that are alternately formed along the length of the electrode lead has a wavy shape.

[0088] When the above process is completed, a secondary battery 100 including a patterned layer 140 can be manufactured.

[0089] In the following description of another embodiment of the invention, components having the same function and structure as those in the above embodiment are given the same reference numerals in the drawings, and therefore repeated descriptions will be omitted.

[0090] [A secondary battery according to a second embodiment of the present invention]

[0091] like Figure 9 As shown, in the secondary battery 100 according to the second embodiment of the present invention, the bag 120 includes a receiving portion 121 and a sealing portion 122, and the sealing portion 122 has a structure in which a resin layer 122a, a metal layer 122b and an insulating layer 122c are stacked in sequence.

[0092] Here, in the sealing pattern layer 142 formed on the sealing portion 122, the sealing recess 142a and the sealing protrusion 142b are patterned only on the resin layer 122a bonded to the lead film 130. That is, the metal layer 122b and the insulating layer 122c have horizontal surfaces, and the sealing pattern layer 142 in which the sealing recess 142a and the sealing protrusion 142b are patterned is formed on the resin layer 122a.

[0093] Therefore, although the secondary battery 100 according to the second embodiment of the present invention looks like an ordinary secondary battery from the outside, the adhesive force can be increased when the adhesive area between the internal lead film and the sealing part of the secondary battery is increased.

[0094] [Electrode assembly according to a third embodiment of the present invention]

[0095] like Figure 10 As shown, the battery pack according to the third embodiment of the present invention has a structure including at least one secondary battery 100 according to the first embodiment of the present invention.

[0096] That is, the battery pack according to the third embodiment of the present invention includes a secondary battery 100 and a housing 200 for accommodating the secondary battery 100.

[0097] Here, the secondary battery 100 may have the same configuration and function as the secondary battery 100 according to the first embodiment, therefore, repeated descriptions will be omitted.

[0098] Therefore, the battery pack according to the third embodiment of the present invention can significantly improve safety by including a secondary battery with increased adhesive strength.

[0099] [A secondary battery according to a fourth embodiment of the present invention]

[0100] like Figure 11 As shown, the secondary battery according to the fourth embodiment of the present invention includes an electrode assembly 110 and a bag 120, an electrode lead 111 is bonded to the electrode assembly 110, and the bag 120 includes a receiving portion 121 and a sealing portion 122.

[0101] In addition, the bonding portion of the sealing portion 122 and the lead film 130 includes a patterned layer 140 for increasing the adhesive force, and the patterned layer includes a lead pattern layer 141 disposed on the lead film 130 and a sealing pattern layer 142 disposed on the sealing portion 122.

[0102] The lead pattern layer 141 includes a lead recess 141a and a lead protrusion 141b, and the sealing pattern layer 142 includes a sealing recess 142a and a sealing protrusion 142b.

[0103] Here, the lead pattern layer 141 can be attached to the surface of the lead film 130. That is, after the lead pattern layer 141 is manufactured separately from the lead film 130, the lead pattern layer 141 is attached to the surface of the lead film by hot melt or adhesive. Therefore, the shapes of the lead recesses and lead protrusions provided in the lead pattern layer 141 can be clearly realized, thus improving the ease of manufacturing.

[0104] Furthermore, the sealing pattern layer 142 can be attached to the surface of the sealing portion 122. That is, after the sealing pattern layer 142 is manufactured separately from the sealing portion 122, the sealing pattern layer 142 is attached to the surface of the sealing portion 122 by heat fusion or adhesive. Therefore, the shapes of the sealing recesses and sealing protrusions provided in the sealing pattern layer 142 can be clearly realized, thereby improving the ease of manufacturing.

[0105] Specifically, the lead pattern layer 141 and the sealing pattern layer 142 can be made of the same material as the lead film. Therefore, the lead pattern layer 141 and the sealing pattern layer 142 are easy to manufacture, and the adhesion between the lead pattern layer and the lead film or between the sealing pattern layer and the sealing portion can be increased.

[0106] The lead pattern layer 141 and the sealing pattern layer 142 can be made of a material with a strength greater than that of each of the lead film and resin layer of the sealing portion. Therefore, when the lead pattern layer 141 and the sealing pattern layer 142 are bonded together, deformation of the shape of the lead pattern layer 141 and the sealing pattern layer 142 can be prevented.

[0107] Therefore, the scope of the invention is defined by the appended claims, rather than by the foregoing description and the exemplary embodiments described therein. Various modifications made within the meaning of equivalents to the claims and within the scope of the claims are considered to be within the scope of the invention.

[0108] [Description of the symbol]

[0109] 100: Secondary battery

[0110] 110: Electrode assembly

[0111] 111: Electrode lead

[0112] 120: bag

[0113] 121: Reception Department

[0114] 122: Sealing component

[0115] 130: Lead film

[0116] 140: Patterned Layer

[0117] 141: Lead Pattern Layer

[0118] 141a: Lead recess

[0119] 141b: Lead Wire Protrusion

[0120] 142: Sealing Pattern Layer

[0121] 142a: Seal recess

[0122] 142b: Sealing convex part

Claims

1. A secondary battery, comprising: Electrode assembly, electrode leads bonded to the electrode assembly; A bag, the bag including a receiving portion and a sealing portion, the receiving portion being configured to receive the electrode assembly when the front end of the electrode lead is pulled out to the outside of the bag, and the sealing portion being configured to seal the receiving portion; as well as A lead film is disposed on the electrode lead, the electrode lead is disposed on the sealing portion of the bag, and the lead film is adhered to the sealing portion to seal the portion between the sealing portion and the electrode lead. A patterned layer is provided on the adhesive portion between the sealing portion and the lead film. The patterned layer is configured to pattern the sealing portion and the lead film to increase the adhesive area between the sealing portion and the lead film. The patterned layer includes a lead pattern layer disposed on the surface of the lead film and a sealing pattern layer disposed on the surface of the sealing portion and bonded to contact the surface of the lead pattern layer. The lead pattern layer includes lead recesses and lead protrusions, the lead recesses and lead protrusions being formed to extend in the width direction of the electrode leads, and The sealing pattern layer includes a sealing recess and a sealing protrusion, the sealing recess and the sealing protrusion being formed to extend in the width direction of the electrode lead and being bonded to contact the surfaces of the lead recess and the lead protrusion. The lead recess and the lead protrusion are alternately formed along the length of the electrode lead, and The sealing recess and the sealing protrusion are alternately formed along the length of the electrode lead. When the lead film is used as a reference plane, the width of the lead protrusions alternately formed along the length of the electrode leads is greater than the width of the lead recesses. When the lead film is used as the reference plane, the width of the sealing protrusions alternately formed along the length of the electrode leads is smaller than the width of the sealing recesses. The sealing protrusion and the lead recess are bonded together to make surface contact with each other, and the sealing recess and the lead protrusion are bonded together to make surface contact with each other, and The height of the lead recess, which is recessed relative to the reference plane, is less than the height of the lead protrusion. Each of the lead pattern layer and the sealing pattern layer is made of a material with a strength greater than that of the lead film.

2. The secondary battery according to claim 1, wherein the lead pattern layer and the sealing pattern layer are formed only on the surfaces of the lead film and the sealing portion, and the surface of the electrode lead is disposed on the surface of the lead film and the sealing portion.

3. The secondary battery according to claim 1, wherein the sealing portion has a structure in which a resin layer, a metal layer, and an insulating layer are stacked in sequence, and In the sealing pattern layer, the entire resin layer, the metal layer, and the insulating layer are patterned into the sealing recess and the sealing protrusion.

4. The secondary battery according to claim 1, wherein the sealing portion has a structure in which a resin layer, a metal layer, and an insulating layer are stacked in sequence, and In the sealing pattern layer, only the resin layer bonded to the lead film is patterned into the sealing recess and the sealing protrusion.

5. The secondary battery according to claim 1, wherein the lead protrusions and lead recesses alternately formed along the length direction of the electrode leads have a wavy shape, and The sealing protrusions and sealing recesses, which are alternately formed along the length of the electrode leads, have a wavy shape.

6. The secondary battery according to claim 1, wherein the lead pattern layer is configured to be attached to the surface of the lead film, and The sealing pattern layer is configured to be attached to the surface of the sealing portion corresponding to the lead pattern layer.

7. A method for manufacturing a secondary battery, the method comprising: The manufacturing process includes preparing an electrode assembly and a bag, bonding electrode leads to the electrode assembly, and the bag including a receiving portion and a sealing portion; The receiving process involves receiving the electrode assembly into the bag while the front end of the electrode lead is pulled out to the outside of the bag; The attachment process involves attaching the lead film to the electrode leads disposed on the sealing portion of the bag; In the patterning process, the surface of the lead film is compressed to form a lead pattern layer, and lead recesses and lead protrusions are patterned on the lead pattern layer; as well as In the sealing process, the sealing portion of the bag is heat-fused to seal the receiving portion. A sealing pattern layer is formed on the sealing portion of the bag, on which the lead pattern layer is disposed. Sealing recesses and sealing protrusions on the sealing pattern layer are patterned to contact the surface of the lead pattern layer, thereby increasing the adhesive area between the sealing portion and the lead film. In the patterning process, the lead recess and the lead protrusion are formed to extend in the width direction of the electrode lead. In the sealing process, the sealing recess and the sealing protrusion are formed to extend in the width direction of the electrode lead. In the patterning process, the lead recess and the lead protrusion are alternately formed along the length of the electrode lead, and In the sealing process, the sealing recess and the sealing protrusion are alternately formed along the length of the electrode lead. When the lead film is used as a reference plane, the width of the lead protrusions alternately formed along the length of the electrode leads is greater than the width of the lead recesses. When the lead film is used as the reference plane, the width of the sealing protrusions alternately formed along the length of the electrode leads is smaller than the width of the sealing recesses. The sealing protrusion and the lead recess are bonded together to make surface contact with each other, and the sealing recess and the lead protrusion are bonded together to make surface contact with each other, and The height of the lead recess, which is recessed relative to the reference plane, is less than the height of the lead protrusion. Each of the lead pattern layer and the sealing pattern layer is made of a material with a strength greater than that of the lead film.

8. The method according to claim 7, wherein in the patterning process, the lead protrusions and lead recesses alternately formed along the length direction of the electrode leads have a wavy shape, and In the sealing process, the sealing protrusions and sealing recesses, which are alternately formed along the length of the electrode lead, have a wavy shape.

9. The method according to claim 7, wherein, In the sealing process, when the sealing portion on which the lead pattern layer is provided is heat-fused, a portion of the sealing portion is inserted into the lead recess of the lead pattern layer to form a sealing protrusion, and the lead protrusion of the lead pattern layer causes the remaining portion of the sealing portion to be recessed to form a sealing recess.

10. A battery pack comprising the secondary battery according to claim 1.

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