Pouch-type battery cells and battery modules containing the same

Abstract

The present invention relates to a pouch-type battery cell and a battery module including the same, and more particularly, to a pouch case having a storage space, an electrode assembly housed inside the pouch case, the electrode assembly including a positive electrode, a negative electrode, and a separator, and having a pair of electrode tabs on one or both sides, and a pair of electrode leads connected to the pair of electrode tabs and protruding out of the pouch case, wherein the sealing part includes a wing part located along the entire length of the pouch case, a terrace part located along the entire width of the pouch case, and a reinforcing part extending outward from the terrace part and having a predetermined shape and area for suppressing or delaying gas venting, and a width of the wing part is greater than a width of the terrace part.

Description

[Technical Field]

[0001] This application claims priority under Korean Patent Application No. 10-2022-0113985 dated September 8, 2022, and all content disclosed in the said Korean Patent Application is incorporated herein by reference.

[0002] The present invention relates to a pouch-type battery cell and a battery module including the same, and more specifically, to a pouch-type battery cell and a battery module including the same that can contribute to extending the lifespan by preventing or delaying gas venting. [Background technology]

[0003] Today, there is increasing demand for rechargeable batteries that can store electrical energy produced through the development of alternative energy sources, due to air pollution caused by the use of fossil fuels and energy depletion. Rechargeable batteries are closely used in daily life, such as in mobile devices, electric vehicles, and hybrid electric vehicles.

[0004] Rechargeable batteries, which are used as an energy source for various electronic devices that are indispensable in modern society, are seeing increased capacity requirements due to the growing usage and complexity of mobile devices and the development of electric vehicles. To meet user demand, small devices have a large number of battery cells, while automobiles and other large vehicles use battery modules that electrically connect a large number of battery cells, or battery packs that contain many such battery modules.

[0005] On the other hand, pouch-type battery cells are formed by preparing a lower case and an upper case using a laminate sheet containing an internal resin layer, a metal layer, and an external resin layer, and then joining them together by heat fusion with the two halves facing each other.

[0006] However, pouch-type battery cells can experience swelling, a phenomenon where the case swells due to gas generation during use at high temperatures or during the charging and discharging process (see Figure 1). In this case, the separation of the heat-sealed joints causes the electrolyte inside the case to leak out, increasing the risk of fire and shortening the lifespan of the battery cell. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Korean Published Patent No. 10-2019-0110349 [Overview of the Initiative] [Problems that the invention aims to solve]

[0008] To solve the aforementioned problems, the present invention aims to provide a pouch-type battery cell and a battery module including the same, having a structure that can prevent or delay gas venting of the pouch-type battery cell. [Means for solving the problem]

[0009] To achieve the above objectives, the pouch-type battery cell according to the present invention comprises a pouch case (100) including a lower case (110) with a storage space, an upper case (120) located above the lower case (110), and a heat-sealed three-sided sealing portion (130) located at the edge where the lower case (110) and the upper case (120) face each other, and an electrode assembly (200) housed inside the pouch case (100) and including a positive electrode, a negative electrode and a separator membrane, and having a pair of electrode tabs on one or both sides, and the pair of electrodes The sealing portion (130) includes a pair of electrode leads (300) connected to a tab and protruding to the outside of the pouch case (100), wherein the sealing portion (130) includes a wing portion (131) located along the overall length of the pouch case (100), a terrace portion (132) located along the overall width of the pouch case (100), and a reinforcing portion (133) extending outward from the terrace portion (132) and having a predetermined shape and area for suppressing or delaying gas venting, wherein the width of the wing portion is greater than the width of the terrace portion.

[0010] Furthermore, in the pouch-type battery cell according to the present invention, the reinforcing portion (133) is provided on each of a pair of terrace portions (132) that are positioned facing each other.

[0011] Furthermore, in the pouch-type battery cell according to the present invention, the reinforcing portion (133) is provided near the edge of the terrace portion (132).

[0012] Furthermore, the pouch-type battery cell according to the present invention is characterized in that the reinforcing portion (133) is provided near both ends of the terrace portion (132).

[0013] Furthermore, in the pouch-type battery cell according to the present invention, the reinforcing portion (133) is provided on both sides of the electrode lead (300) with the electrode lead (300) in between.

[0014] Furthermore, in the pouch-type battery cell according to the present invention, the wing portion (131) is characterized in that it is bent toward the side surface in the overall length direction of the pouch case (100).

[0015] Furthermore, in the pouch-type battery cell according to the present invention, the reinforcing portion (133) is characterized in that it is bent toward the side surface in the width direction of the pouch case (100).

[0016] Furthermore, in the pouch-type battery cell according to the present invention, a fixing member (600) is positioned on the outer surface of the reinforcing portion (133) so as to maintain the reinforcing portion (133) in a bent state.

[0017] Furthermore, in the pouch-type battery cell according to the present invention, the fixing member (600) is a strip-shaped tape with adhesive applied to one surface, positioned to wrap around the reinforcing portion (133), with one end fixed to the lower case (110) and the other end fixed to the upper case (120).

[0018] Furthermore, the method for manufacturing a pouch-type battery cell according to the present invention includes: a first step of cutting a laminate sheet including an internal resin layer, a metal layer, and an external resin layer to a predetermined shape and size; a second step of preparing a pouch case by forming a pair of storage spaces that face each other when the cut laminate sheet is folded; a third step of storing an electrode assembly in the storage spaces of the pouch case; and a fourth step of forming a sealing portion by heat-sealing the edges of the storage spaces after the pouch case has been folded, wherein the sealing portion includes a wing portion located along the overall length of the pouch case, a terrace portion located along the overall width of the pouch case, and a reinforcing portion extending outward from the terrace portion and having a predetermined shape and area for suppressing or delaying gas venting, wherein the width of the wing portion is greater than the width of the terrace portion.

[0019] Also, in the method for manufacturing a pouch-type battery cell according to the present invention, after the fourth step, it further includes a step of bending the wing portion toward the side surface in the longitudinal direction of the pouch case.

[0020] Also, in the method for manufacturing a pouch-type battery cell according to the present invention, after the fourth step, it further includes a step of bending the reinforcing portion toward the side surface in the width direction of the pouch case (100).

[0021] Also, in the method for manufacturing a pouch-type battery cell according to the present invention, it further includes a step of fixing the outer surface of the reinforcing portion and the outer surface of the pouch case with a tape so as to maintain the bent state of the reinforcing portion.

[0022] Also, the present invention is a battery module including the above-described pouch-type battery cell.

Effect of the Invention

[0023] [[ID=ID=19]]As described above, according to the pouch-type battery cell and the battery module including the same according to the present invention, by providing a reinforcing portion at the sealing portion of the terrace portion vulnerable to the pressure of the venting gas, gas venting can be suppressed or delayed, which can contribute to extending the life of the battery cell.

Brief Description of Drawings

[0024] [Figure 1] It is a schematic diagram of a pouch-type battery cell in a state where swelling has occurred. [Figure 2] It is an exploded perspective view of a pouch-type battery cell according to a preferred first embodiment of the present invention. [Figure 3] It is a perspective view of a sealed state of a pouch-type battery cell according to a preferred first embodiment of the present invention. [Figure 4] It is a plan view of the pouch-type battery cell shown in FIG. 3. [Figure 5] It is a perspective view of a pouch-type battery cell according to a preferred first embodiment of the present invention. [Figure 6] Figure 5 shows a cross-sectional view of a pouch-type battery cell cut along the line B-B'. [Figure 7] This is a perspective view of a sealed pouch-type battery cell according to a preferred second embodiment of the present invention. [Figure 8] Figure 7 is a plan view of the pouch-type battery cell. [Figure 9] This is a perspective view of a pouch-type battery cell according to a preferred second embodiment of the present invention. [Figure 10] This is a flowchart illustrating the method for manufacturing a pouch-type battery cell according to the present invention. [Modes for carrying out the invention]

[0025] Hereinafter, embodiments that allow a person with ordinary skill in the art to carry out the present invention will be described in detail based on the attached drawings. However, in describing the operating principles of preferred embodiments of the present invention in detail, if it is determined that a specific description of a related known function or configuration may unnecessarily obscure the gist of the present invention, such detailed description will be omitted.

[0026] Furthermore, the same reference numerals shall be used throughout the drawings for parts that have similar functions and operations. Throughout the specification, when it is said that one part is connected to another part, this includes not only direct connections but also indirect connections through other elements in between. Also, when it is said that a component is included, unless otherwise stated, it does not mean that other components are excluded, but rather that other components may be included.

[0027] The pouch-type battery cell and battery module containing the same according to the present invention will be described below with reference to the attached drawings.

[0028] Figure 2 is an exploded perspective view of a pouch-type battery cell according to a preferred first embodiment of the present invention, Figure 3 is a perspective view of the sealed pouch-type battery cell according to a preferred first embodiment of the present invention, and Figure 4 is a plan view of the pouch-type battery cell shown in Figure 3.

[0029] Furthermore, Figure 5 is a perspective view of a pouch-type battery cell according to a preferred first embodiment of the present invention, and Figure 6 is a cross-sectional view of the pouch-type battery cell of Figure 5, cut along the line B-B'.

[0030] As shown in Figures 2 to 6, the pouch-type battery cell according to the present invention may include a pouch case 100, an electrode assembly 200, electrode leads 300, protective tape 400, lead film 500, and a fixing member 600.

[0031] First, the pouch case 100 may include a lower case 110 and an upper case 120, and a pocket-shaped storage space S is formed so that the electrode assembly 200 can be stored in it.

[0032] Such a pouch case 100 uses a laminate sheet that includes an outer resin layer, a metal layer, and an inner resin layer.

[0033] More specifically, the lower case 110 may include a first internal resin layer 111 located on the innermost side, a first metal layer 112 located in the middle, and a first external resin layer 113 located on the outermost side.

[0034] In the case of the upper case 120, the second internal resin layer 121 is located on the innermost side, the second metal layer 122 is located in the middle, and the second external resin layer 123 is located on the outermost side.

[0035] The first and second outer resin layers 113 and 123 located on the outer casing of the pouch case 100 can be made of a heat-resistant polymer with excellent tensile strength, moisture resistance, and air resistance, so as to ensure heat resistance and chemical resistance while protecting the electrode assembly 200. For example, nylon or polyethylene terephthalate can be used, but are not limited to these.

[0036] The metal layers in contact with the outer resin layer, namely the first metal layer 112 and the second metal layer 122 located in the center of the pouch case 100, act as barrier layers to prevent moisture and various gases from penetrating into the battery. A preferred material for such metal layers is a thin aluminum film that is lightweight yet has excellent moldability.

[0037] Furthermore, the first internal resin layer 111 and the second internal resin layer 121, located on the innermost side of the pouch case 100, are in direct contact with the electrode assembly 200 and must therefore possess insulating and electrolytic resistance properties. In addition, for sealing to the outside, they must have sealing properties, meaning that the sealing portions where the internal layers are heat-bonded together must have excellent thermal bonding strength.

[0038] The materials for the first internal resin layer 111 and the second internal resin layer 121 can be selected from, but are not limited to, polyolefin resins such as polypropylene, polyethylene, polyethylene acrylic acid, and polybutylene, polyurethane resins, and polyimide resins, which have excellent chemical resistance and good sealing properties. Polypropylene is most preferred because it has excellent mechanical properties such as tensile strength, rigidity, surface hardness, and impact strength, as well as excellent chemical resistance.

[0039] Figures 2 and 3 show that storage space is provided in both the lower case 110 and the upper case 120, but it is clear that storage space can also be provided in only one of these cases.

[0040] On the other hand, to prevent moisture, air, etc. from flowing into the storage space S of the lower case 110 and the upper case 120, a heat-sealed sealing portion 130 is provided along the edges where the lower case 110 and the upper case 120 face each other.

[0041] Preferably, such a sealing portion 130 includes a wing portion 131 located along the overall length direction (X-axis direction) of the pouch case 100, a terrace portion 132 located along the overall width direction (Y-axis direction) of the pouch case 100, and a reinforcing portion 133 extending from the terrace portion 132.

[0042] The reinforcing portion 133 is intended to extend the life of the battery cell by suppressing or delaying gas venting that occurs inside the pouch case 100, and is located alongside the electrode leads.

[0043] More specifically, it is preferable that they be provided on each of a pair of terrace portions 132 that are positioned facing each other, more preferably on one side edge spaced a predetermined distance from the electrode lead 300, and most preferably on the edge of a terrace portion 132 that is adjacent to the wing portion 131.

[0044] To explain further, as shown in Figure 4, L1 defines the length of the wing portion and L2 defines the length of the terrace portion. Assuming that the wing portion 131 is folded along the line A-A', the terrace portion 132 is positioned so as not to overlap with the line A-A' so that it is not folded together with the wing portion 131.

[0045] Here, the shape and area of ​​the reinforcing portion 133 are not particularly limited, but it may be trapezoidal in order to increase the sealing force of the terrace portion 132 while keeping the area small. Here, it is preferable that the longer side is connected to the terrace portion 132, and it is even more preferable that the reinforcing portion 133 has a height such that it does not protrude above the upper case when it is folded toward the side in the full width direction of the pouch case 100.

[0046] When applied to a real environment, the area in a pouch-type battery cell where stress due to gas generation is concentrated and the sealing is prone to rupture is the terrace portion 132 where the electrode lead 300 protrudes, and the edge portion separated from the electrode lead 300 at a predetermined distance is particularly vulnerable.

[0047] More specifically, the width W1 of the wing portion that constitutes the sealing part of the pouch-type battery cell is relatively longer than the width W2 of the terrace portion, and is fixed in a folded state toward the side in the overall length direction, making it possible to maintain a high sealing force. On the other hand, the terrace portion 132 cannot be bent because the electrode leads are located there, and there is a disadvantage that the energy density decreases when the width W2 of the terrace portion is increased in order to increase the sealing force.

[0048] Of course, the width W2 of the terrace area near the electrode lead 300 is also short, but since the lead portion is supported or fixed by the general structure of the module in which the pouch-type battery cell is used, the structure makes it difficult for gas to be vented near the electrode lead 300.

[0049] However, as in the present invention, when a reinforcing portion is provided on one side edge of the terrace portion that is separated from the electrode lead 300, the sealing force of the terrace portion can be increased, and as a result, gas venting can be suppressed or delayed, thereby extending the life of the battery cell.

[0050] In particular, when the reinforcing portion 133 is bent toward the side in the width direction of the pouch case 100, and the bent state is maintained using the fixing member 600 described later, the sealing force is further improved.

[0051] Next, the electrode assembly 200 will be described. The electrode assembly 200 seated in the storage space of the pouch case 100 can be composed of, but is not limited to, a jelly roll type electrode assembly having a structure in which a separator is interposed between a long sheet-like negative electrode and a positive electrode and then wound, a stack type electrode assembly composed of unit cells having a structure in which a rectangular positive electrode and a negative electrode are laminated with a separator interposed therebetween, a stack folding type electrode assembly in which unit cells are wound by a long separation film, or a lamination stack type electrode assembly in which unit cells are laminated with a separator interposed therebetween and adhered to each other.

[0052] Specifically, the negative electrode is manufactured by applying a slurry in which a negative electrode active material and a binder are mixed to a negative electrode current collector.

[0053] Here, as the negative electrode active material, for example, carbon such as graphitizable carbon and graphite-based carbon; Li x Fe2O3(0≦x≦1), Li x WO2(0≦x≦1), Sn x Me 1-x Me’ y O z (Me: Mn, Fe, Pb, Ge; Me’: Al, B, P, Si, Group 1, Group 2, Group 3 elements of the periodic table, halogen; 0 < x ≦ 1; 1 ≦ y ≦ 3; 1 ≦ z ≦ 8) and other metal composite oxides; lithium metal; lithium alloy; silicon-based alloy; tin-based alloy; metal oxides such as SnO, SnO2, PbO, PbO2, Pb2O3, Pb3O4, Sb2O3, Sb2O4, Sb2O5, GeO, GeO2, Bi2O3, Bi2O4, Bi2O5; conductive polymers such as polyacetylene; Li-Co-Ni-based materials; Si-based materials that are Si, SiO, SiO2 alone or mixtures thereof can be used, but are not limited thereto.

[0054] The positive electrode is manufactured by applying a slurry in which a positive electrode active material and a binder are mixed to a positive electrode current collector.

[0055] And as the positive electrode active material, there are layered compounds such as lithium cobalt oxide (LiCoO2) and lithium nickel oxide (LiNiO2), or compounds substituted with one or more transition metals; chemical formula Li 1+x Mn 2-x O4 (where x is 0 to 0.33), lithium manganese oxides such as LiMnO3, LiMn2O3, and LiMnO2; lithium copper oxide (Li2CuO2); vanadium oxides such as LiV3O8, V2O5, and Cu2V2O7; chemical formula LiNi 1-x M x O2 (where M = Co, Mn, Al, Cu, Fe, Mg, B, or Ga, and x = 0.01 to 0.3), Ni-site type lithium nickel oxides represented by this; chemical formula LiMn 2-x M x O2 (where M = Co, Ni, Fe, Cr, Zn, or Ta, and x = 0.01 to 0.1) or lithium manganese composite oxides represented by Li2Mn3MO8 (where M = Fe, Co, Ni, Cu, or Zn); LiMn2O4 in which part of the Li in the chemical formula is substituted with alkaline earth metal ions; disulfide compounds; Fe2(MoO4)3, etc. can be mentioned, but it is not limited only to these.

[0056] On the other hand, the negative electrode current collector and the positive electrode current collector include a portion where a slurry mixed with an active material is coated and a plain portion where the slurry is not coated, and the plain portion is cut to form or a separate conductive member is connected to the plain portion by ultrasonic welding or the like to form a pair of electrode tabs, that is, the positive electrode tab 210 and the negative electrode tab 220.

[0057] A pair of electrode leads 300 including the positive electrode lead 310 and the negative electrode lead 320 are electrically connected to the positive electrode tab 210 and the negative electrode tab 220 respectively, and then have a structure that is exposed outside the pouch case 100.

[0058] Here, these pair of electrode tabs and electrode leads 400 can be electrically connected by welding, more specifically by ultrasonic welding. Such ultrasonic welding proceeds on the principle that by applying high-frequency vibrations generated by high ultrasonic waves of approximately 20 kHz, the vibrational energy is converted into thermal energy by friction through the operation of a horn and anvil at the interface between the electrode tab and the electrode lead, thereby rapidly welding.

[0059] Next, the protective tape 400 will be described. The protective tape 400 is positioned to wrap around the portion where the electrode tab and the electrode lead 300 overlap each other, that is, the welded portion.

[0060] Since the electrode tab and electrode lead 300 are joined by welding, the surfaces of the electrode tab and electrode lead 300 may not be smooth, which can lead to insulation failure.

[0061] In detail, if the surface of the weld is not smooth, and the weld comes into contact with the pouch case 100 due to impact, the internal resin layer will peel off, exposing the metal layer, resulting in insulation failure. Therefore, it is preferable to wrap the weld with protective tape 400 to prevent the aforementioned insulation failure from occurring.

[0062] Here, the protective tape 400 may be made of an insulating material. For example, it may be made of polypropylene, polyethylene, polyester, or polyimide, but is not limited to these, as long as it is a material that can wrap the weld and maintain an insulating state when in contact with the pouch case 100.

[0063] The lead film 500, including the first lead film 510 and the second lead film 520, is separated from the protective tape 400 by a certain distance and is located in the sealing portion 130 where the upper case 120 and lower case 110, which constitute the pouch case 100, are heat-fused together, thereby fixing the electrode lead 300 to the pouch case 100. Thus, the sealing of the pouch case 100 is maintained while preventing electricity generated from the electrode assembly 200 from flowing to the pouch case 100 through the electrode lead 300.

[0064] Such lead films 500 are preferably made of a non-conductive material that does not conduct electricity well, and generally, insulating tapes that adhere easily to the electrode leads 300 and are relatively thin are often used, but are not limited to these.

[0065] Specifically, the lead film 500 may be one or more materials selected from the group consisting of polyimide (PI), polypropylene (PP), polyethylene (PE), polyethylene terephthalate (PET), polyvinyl chloride (PVC), high-density polyethylene (HDPE), and epoxy resin, and is heat-fused to the inner resin layer of the pouch case by heat and pressure.

[0066] Next, the fixing member 600 will be described. As mentioned above, the fixing member 600 is a component for fixing the reinforcing part. Specifically, the fixing member 600 is a strip-shaped tape with adhesive applied to one side, and is positioned to wrap around the reinforcing part 133. That is, one end is fixed to the lower case 110 and the other end is fixed to the upper case 120, thereby maintaining the bent state of the reinforcing part 133.

[0067] Figure 7 is a perspective view of a sealed pouch-type battery cell according to a preferred second embodiment of the present invention, Figure 8 is a plan view of the pouch-type battery cell shown in Figure 7, and Figure 9 is a perspective view of a pouch-type battery cell according to a preferred second embodiment of the present invention.

[0068] Since this preferred first embodiment of the present invention differs from the previously described invention only in the reinforcing portion, and the rest of the configuration is the same, only the reinforcing portion will be described below.

[0069] The reinforcing portion in the second embodiment is located on a pair of opposing terrace portions 132, and is provided near both side edges of each terrace portion 132, that is, on both sides with the electrode lead 300 in between.

[0070] Next, the method for manufacturing a pouch-type battery cell according to the present invention will be described. Figure 10 is a flowchart illustrating the method for manufacturing a pouch-type battery cell according to the present invention.

[0071] Referring to Figure 10, the method for manufacturing a pouch-type battery cell of the present invention may include: a first step of cutting a laminate sheet containing an internal resin layer, a metal layer, and an external resin layer to a predetermined shape and size; a second step of preparing a pouch case by forming a pair of storage spaces so that they face each other when the cut laminate sheet is folded; a third step of storing an electrode assembly in the storage spaces of the pouch case; and a fourth step of forming a sealing portion by heat-sealing the edges of the storage spaces after folding the pouch case.

[0072] It is clear that the laminate sheet must be cut in a way that allows for the formation of reinforcing sections during the first stage of cutting. In other words, the sealing section is formed by the heat fusion process in the fourth stage. This is because the sealing section includes wing sections located along the entire length of the pouch case, terrace sections located along the entire width of the pouch case, and reinforcing sections extending outward from the terrace sections.

[0073] In the second stage, after heat fusion, a storage space is formed so that the width of the wing section is greater than the width of the terrace section.

[0074] On the other hand, the fourth stage may further include the steps of folding the wing portion toward the side of the pouch case in the overall direction and the reinforcing portion toward the side of the pouch case in the overall width direction. These steps may be performed simultaneously.

[0075] Furthermore, after bending the reinforcing portion, it is preferable to further perform the step of securing the outer surface of the reinforcing portion to the outer surface of the pouch case with tape so that the reinforcing portion remains bent.

[0076] The present invention may be a battery module including the aforementioned pouch-type battery cells, or a battery pack including the battery module.

[0077] A person with ordinary skill in the field to which this invention belongs will be able to make various applications and modifications within the scope of this invention based on the above content. [Explanation of symbols]

[0078] 100 pouch cases 110 Lower case 111 1st internal resin layer 112 1st metal layer 113 First outer resin layer 120 Top Case 121 Second internal resin layer 122 2nd metal layer 123 Second outer resin layer 130 Sealing section 131 Wings 132 Terrace section 133 Reinforcement section 200 electrode assembly 210 Positive Tab 220 Negative Electrode Tabs 300 electrode leads 310 Positive Lead 320 Negative Leads 400 protective tapes 410 First protective tape 420 Second protective tape 500 Lead Film 510 First Lead Film 520 Second lead film 600 Fixing member L1 Length of the wing section L2 Terrace section length W1 Wing width W2 Terrace width S storage space

Claims

1. A lower case with storage space, an upper case located above the lower case, and a pouch case located at the edge where the lower case and the upper case face each other, including three heat-sealed sealing sections, An electrode assembly housed inside the pouch case, comprising a positive electrode, a negative electrode, and a separator membrane, and having a pair of electrode tabs on one or both sides, It includes a pair of electrode leads connected to the pair of electrode tabs and protruding to the outside of the pouch case, The sealing portion includes a wing portion located along the overall length of the pouch case, a terrace portion located along the overall width of the pouch case, and a reinforcing portion extending outward from the terrace portion and having a predetermined shape and area for suppressing or delaying gas venting. The width of the wing portion is greater than the width of the terrace portion. The reinforcing portion is provided on each of the pair of terrace sections that are located facing each other. A pouch-type battery cell in which the reinforcing parts provided on each of the pair of terrace sections are heat-welded to each other, facing each other.

2. The pouch-type battery cell according to claim 1, wherein the reinforcing portion is provided near the edges of the pair of terrace portions.

3. The pouch-type battery cell according to claim 2, wherein the reinforcing portions are provided near both ends of the pair of terrace portions.

4. The pouch-type battery cell according to claim 2, wherein the reinforcing portion is provided on both sides of the electrode lead, with the electrode lead in between.

5. The wing portion is bent toward the side surface in the overall length direction of the pouch case, as described in claim 1, for the pouch-type battery cell.

6. A lower case with storage space, an upper case located above the lower case, and a pouch case located at the edge where the lower case and the upper case face each other, including three heat-sealed sealing sections, An electrode assembly housed inside the pouch case, comprising a positive electrode, a negative electrode, and a separator membrane, and having a pair of electrode tabs on one or both sides, It includes a pair of electrode leads connected to the pair of electrode tabs and protruding to the outside of the pouch case, The sealing portion includes a wing portion located along the overall length of the pouch case, a terrace portion located along the overall width of the pouch case, and a reinforcing portion extending outward from the terrace portion and having a predetermined shape and area for suppressing or delaying gas venting. The width of the wing portion is greater than the width of the terrace portion. The reinforcing portion is bent toward the side of the pouch case in the width direction, A pouch-type battery cell in which a fixing member is positioned on the outer surface of the reinforcing portion so as to maintain the reinforcing portion in a bent state.

7. The fixing member is a strip-shaped tape with adhesive applied to one surface, positioned to wrap around the reinforcing portion, with one end fixed to the lower case and the other end fixed to the upper case, as described in claim 6.

8. The first step involves cutting a laminate sheet containing an internal resin layer, a metal layer, and an external resin layer into a predetermined shape and size. The second step involves preparing the pouch case by folding the cut laminate sheets to form a pair of storage spaces that face each other, The third step involves storing the electrode assembly in the storage space of the aforementioned pouch case, The fourth step includes folding the pouch case and then heat-sealing the edges of the storage space to form a sealing portion, The sealing portion includes a wing portion located along the overall length of the pouch case, a terrace portion located along the overall width of the pouch case, and a reinforcing portion extending outward from the terrace portion and having a predetermined shape and area for suppressing or delaying gas venting. The width of the wing portion is greater than the width of the terrace portion. The reinforcing portion is provided on each of the pair of terrace sections that are located facing each other. A method for manufacturing a pouch-type battery cell, wherein the reinforcing portions provided on each of the pair of terrace portions are heat-welded to each other, facing one another.

9. The method for manufacturing a pouch-type battery cell according to claim 8, further comprising the step of bending the wing portion toward the side of the pouch case in the overall direction after the fourth step.

10. The first step involves cutting a laminate sheet containing an internal resin layer, a metal layer, and an external resin layer into a predetermined shape and size. The second step involves preparing the pouch case by folding the cut laminate sheets to form a pair of storage spaces that face each other, The third step involves storing the electrode assembly in the storage space of the aforementioned pouch case, A fourth step is to fold the pouch case and then heat-seal the edges of the storage space to form a sealing portion, wherein the sealing portion includes a wing portion located along the overall length of the pouch case, a terrace portion located along the overall width of the pouch case, and a reinforcing portion extending outward from the terrace portion and having a predetermined shape and area for suppressing or delaying gas venting, wherein the width of the wing portion is greater than the width of the terrace portion, After the fourth step, the reinforcing portion is bent toward the side in the width direction of the pouch case, The steps include: securing the outer surface of the reinforcing part to the outer surface of the pouch case with tape so that the reinforcing part maintains its bent state, A method for manufacturing pouch-type battery cells, including [the specified part of the invention].

11. A battery module comprising a pouch-type battery cell according to any one of claims 1 to 7.

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